sql_parse.cc 225 KB
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/* Copyright (C) 2000-2003 MySQL AB
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   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; version 2 of the License.
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   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

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#define MYSQL_LEX 1
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#include "mysql_priv.h"
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#include "sql_repl.h"
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#include "repl_failsafe.h"
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#include <m_ctype.h>
#include <myisam.h>
#include <my_dir.h>

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#ifdef HAVE_INNOBASE_DB
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#include "ha_innodb.h"
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#endif

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#ifdef HAVE_NDBCLUSTER_DB
#include "ha_ndbcluster.h"
#endif

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#include "sp_head.h"
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#include "sp.h"
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#include "sp_cache.h"
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#include "sql_trigger.h"
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#ifdef HAVE_OPENSSL
/*
  Without SSL the handshake consists of one packet. This packet
  has both client capabilites and scrambled password.
  With SSL the handshake might consist of two packets. If the first
  packet (client capabilities) has CLIENT_SSL flag set, we have to
  switch to SSL and read the second packet. The scrambled password
  is in the second packet and client_capabilites field will be ignored.
  Maybe it is better to accept flags other than CLIENT_SSL from the
  second packet?
*/
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#define SSL_HANDSHAKE_SIZE      2
#define NORMAL_HANDSHAKE_SIZE   6
#define MIN_HANDSHAKE_SIZE      2
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#else
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#define MIN_HANDSHAKE_SIZE      6
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#endif /* HAVE_OPENSSL */
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/* Used in error handling only */
#define SP_TYPE_STRING(LP) \
  ((LP)->sphead->m_type == TYPE_ENUM_FUNCTION ? "FUNCTION" : "PROCEDURE")
#define SP_COM_STRING(LP) \
  ((LP)->sql_command == SQLCOM_CREATE_SPFUNCTION || \
   (LP)->sql_command == SQLCOM_ALTER_FUNCTION || \
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   (LP)->sql_command == SQLCOM_SHOW_CREATE_FUNC || \
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   (LP)->sql_command == SQLCOM_DROP_FUNCTION ? \
   "FUNCTION" : "PROCEDURE")

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#ifdef SOLARIS
extern "C" int gethostname(char *name, int namelen);
#endif
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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static void time_out_user_resource_limits(THD *thd, USER_CONN *uc);
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static int check_for_max_user_connections(THD *thd, USER_CONN *uc);
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static void decrease_user_connections(USER_CONN *uc);
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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static bool check_db_used(THD *thd,TABLE_LIST *tables);
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static void remove_escape(char *name);
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static bool append_file_to_dir(THD *thd, const char **filename_ptr,
			       const char *table_name);
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const char *any_db="*any*";	// Special symbol for check_access
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const char *command_name[]={
  "Sleep", "Quit", "Init DB", "Query", "Field List", "Create DB",
  "Drop DB", "Refresh", "Shutdown", "Statistics", "Processlist",
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  "Connect","Kill","Debug","Ping","Time","Delayed insert","Change user",
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  "Binlog Dump","Table Dump",  "Connect Out", "Register Slave",
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  "Prepare", "Execute", "Long Data", "Close stmt",
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  "Reset stmt", "Set option", "Fetch",
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  "Error"					// Last command number
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};

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const char *xa_state_names[]={
  "NON-EXISTING", "ACTIVE", "IDLE", "PREPARED"
};

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#ifdef __WIN__
static void  test_signal(int sig_ptr)
{
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#if !defined( DBUG_OFF)
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  MessageBox(NULL,"Test signal","DBUG",MB_OK);
#endif
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#if defined(OS2)
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  fprintf(stderr, "Test signal %d\n", sig_ptr);
  fflush(stderr);
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#endif
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}
static void init_signals(void)
{
  int signals[7] = {SIGINT,SIGILL,SIGFPE,SIGSEGV,SIGTERM,SIGBREAK,SIGABRT } ;
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  for (int i=0 ; i < 7 ; i++)
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    signal( signals[i], test_signal) ;
}
#endif

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static void unlock_locked_tables(THD *thd)
{
  if (thd->locked_tables)
  {
    thd->lock=thd->locked_tables;
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    thd->locked_tables=0;			// Will be automatically closed
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    close_thread_tables(thd);			// Free tables
  }
}

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static bool end_active_trans(THD *thd)
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{
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  int error=0;
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  DBUG_ENTER("end_active_trans");
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  if (unlikely(thd->in_sub_stmt))
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  {
    my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0));
    DBUG_RETURN(1);
  }
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  if (thd->transaction.xid_state.xa_state != XA_NOTR)
  {
    my_error(ER_XAER_RMFAIL, MYF(0),
             xa_state_names[thd->transaction.xid_state.xa_state]);
    DBUG_RETURN(1);
  }
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  if (thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN |
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		      OPTION_TABLE_LOCK))
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  {
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    DBUG_PRINT("info",("options: 0x%lx", (ulong) thd->options));
    /* Safety if one did "drop table" on locked tables */
    if (!thd->locked_tables)
      thd->options&= ~OPTION_TABLE_LOCK;
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    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
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    if (ha_commit(thd))
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      error=1;
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    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
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  }
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  DBUG_RETURN(error);
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}

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static bool begin_trans(THD *thd)
{
  int error=0;
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  if (unlikely(thd->in_sub_stmt))
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  {
    my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0));
    return 1;
  }
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  if (thd->locked_tables)
  {
    thd->lock=thd->locked_tables;
    thd->locked_tables=0;			// Will be automatically closed
    close_thread_tables(thd);			// Free tables
  }
  if (end_active_trans(thd))
    error= -1;
  else
  {
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    LEX *lex= thd->lex;
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    thd->options= ((thd->options & (ulong) ~(OPTION_STATUS_NO_TRANS_UPDATE)) |
		   OPTION_BEGIN);
    thd->server_status|= SERVER_STATUS_IN_TRANS;
    if (lex->start_transaction_opt & MYSQL_START_TRANS_OPT_WITH_CONS_SNAPSHOT)
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      error= ha_start_consistent_snapshot(thd);
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  }
  return error;
}
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#ifdef HAVE_REPLICATION
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/*
  Returns true if all tables should be ignored
*/
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inline bool all_tables_not_ok(THD *thd, TABLE_LIST *tables)
{
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  return table_rules_on && tables && !tables_ok(thd,tables);
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}
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#endif
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static bool some_non_temp_table_to_be_updated(THD *thd, TABLE_LIST *tables)
{
  for (TABLE_LIST *table= tables; table; table= table->next_global)
  {
    DBUG_ASSERT(table->db && table->table_name);
    if (table->updating &&
        !find_temporary_table(thd, table->db, table->table_name))
      return 1;
  }
  return 0;
}

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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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static HASH hash_user_connections;

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static int get_or_create_user_conn(THD *thd, const char *user,
				   const char *host,
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				   USER_RESOURCES *mqh)
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{
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  int return_val= 0;
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  uint temp_len, user_len;
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  char temp_user[USER_HOST_BUFF_SIZE];
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  struct  user_conn *uc;

  DBUG_ASSERT(user != 0);
  DBUG_ASSERT(host != 0);

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  user_len= strlen(user);
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  temp_len= (strmov(strmov(temp_user, user)+1, host) - temp_user)+1;
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  (void) pthread_mutex_lock(&LOCK_user_conn);
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  if (!(uc = (struct  user_conn *) hash_search(&hash_user_connections,
					       (byte*) temp_user, temp_len)))
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  {
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    /* First connection for user; Create a user connection object */
    if (!(uc= ((struct user_conn*)
	       my_malloc(sizeof(struct user_conn) + temp_len+1,
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			 MYF(MY_WME)))))
    {
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      net_send_error(thd, 0, NullS);		// Out of memory
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      return_val= 1;
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      goto end;
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    }
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    uc->user=(char*) (uc+1);
    memcpy(uc->user,temp_user,temp_len+1);
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    uc->host= uc->user + user_len +  1;
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    uc->len= temp_len;
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    uc->connections= uc->questions= uc->updates= uc->conn_per_hour= 0;
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    uc->user_resources= *mqh;
    uc->intime= thd->thr_create_time;
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    if (my_hash_insert(&hash_user_connections, (byte*) uc))
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    {
      my_free((char*) uc,0);
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      net_send_error(thd, 0, NullS);		// Out of memory
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      return_val= 1;
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      goto end;
    }
  }
  thd->user_connect=uc;
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  uc->connections++;
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end:
  (void) pthread_mutex_unlock(&LOCK_user_conn);
  return return_val;
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}
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#endif /* !NO_EMBEDDED_ACCESS_CHECKS */
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/*
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  Check if user exist and password supplied is correct. 

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  SYNOPSIS
    check_user()
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    thd          thread handle, thd->security_ctx->{host,user,ip} are used
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    command      originator of the check: now check_user is called
                 during connect and change user procedures; used for 
                 logging.
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    passwd       scrambled password received from client
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    passwd_len   length of scrambled password
    db           database name to connect to, may be NULL
    check_count  dont know exactly

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    Note, that host, user and passwd may point to communication buffer.
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    Current implementation does not depend on that, but future changes
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    should be done with this in mind; 'thd' is INOUT, all other params
    are 'IN'.

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  RETURN VALUE
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    0  OK; thd->security_ctx->user/master_access/priv_user/db_access and
       thd->db are updated; OK is sent to client;
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   -1  access denied or handshake error; error is sent to client;
   >0  error, not sent to client
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*/

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int check_user(THD *thd, enum enum_server_command command, 
	       const char *passwd, uint passwd_len, const char *db,
	       bool check_count)
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{
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  DBUG_ENTER("check_user");
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#ifdef NO_EMBEDDED_ACCESS_CHECKS
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  thd->main_security_ctx.master_access= GLOBAL_ACLS;       // Full rights
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  /* Change database if necessary */
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  if (db && db[0])
  {
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    /*
      thd->db is saved in caller and needs to be freed by caller if this
      function returns 0
    */
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    thd->reset_db(NULL, 0);
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    if (mysql_change_db(thd, db, FALSE))
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    {
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      /* Send the error to the client */
      net_send_error(thd);
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      DBUG_RETURN(-1);
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    }
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  }
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  send_ok(thd);
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  DBUG_RETURN(0);
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#else

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  my_bool opt_secure_auth_local;
  pthread_mutex_lock(&LOCK_global_system_variables);
  opt_secure_auth_local= opt_secure_auth;
  pthread_mutex_unlock(&LOCK_global_system_variables);
  
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  /*
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    If the server is running in secure auth mode, short scrambles are 
    forbidden.
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  */
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  if (opt_secure_auth_local && passwd_len == SCRAMBLE_LENGTH_323)
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  {
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    net_printf_error(thd, ER_NOT_SUPPORTED_AUTH_MODE);
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    mysql_log.write(thd, COM_CONNECT, ER(ER_NOT_SUPPORTED_AUTH_MODE));
    DBUG_RETURN(-1);
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  }
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  if (passwd_len != 0 &&
      passwd_len != SCRAMBLE_LENGTH &&
      passwd_len != SCRAMBLE_LENGTH_323)
    DBUG_RETURN(ER_HANDSHAKE_ERROR);
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  /*
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    Clear thd->db as it points to something, that will be freed when 
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    connection is closed. We don't want to accidentally free a wrong pointer
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    if connect failed. Also in case of 'CHANGE USER' failure, current
    database will be switched to 'no database selected'.
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  */
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  thd->reset_db(NULL, 0);

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  USER_RESOURCES ur;
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  int res= acl_getroot(thd, &ur, passwd, passwd_len);
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#ifndef EMBEDDED_LIBRARY
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  if (res == -1)
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  {
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    /*
      This happens when client (new) sends password scrambled with
      scramble(), but database holds old value (scrambled with
      scramble_323()). Here we please client to send scrambled_password
      in old format.
    */
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    NET *net= &thd->net;
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    if (opt_secure_auth_local)
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    {
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      net_printf_error(thd, ER_SERVER_IS_IN_SECURE_AUTH_MODE,
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                       thd->main_security_ctx.user,
                       thd->main_security_ctx.host_or_ip);
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      mysql_log.write(thd, COM_CONNECT, ER(ER_SERVER_IS_IN_SECURE_AUTH_MODE),
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                      thd->main_security_ctx.user,
                      thd->main_security_ctx.host_or_ip);
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      DBUG_RETURN(-1);
    }
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    /* We have to read very specific packet size */
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    if (send_old_password_request(thd) ||
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        my_net_read(net) != SCRAMBLE_LENGTH_323 + 1)
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    {
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      inc_host_errors(&thd->remote.sin_addr);
      DBUG_RETURN(ER_HANDSHAKE_ERROR);
    }
    /* Final attempt to check the user based on reply */
    /* So as passwd is short, errcode is always >= 0 */
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    res= acl_getroot(thd, &ur, (char *) net->read_pos, SCRAMBLE_LENGTH_323);
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  }
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#endif /*EMBEDDED_LIBRARY*/
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  /* here res is always >= 0 */
  if (res == 0)
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  {
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    if (!(thd->main_security_ctx.master_access &
          NO_ACCESS)) // authentication is OK
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    {
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      DBUG_PRINT("info",
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                 ("Capabilities: %lu  packet_length: %ld  Host: '%s'  "
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                  "Login user: '%s' Priv_user: '%s'  Using password: %s "
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                  "Access: %lu  db: '%s'",
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                  thd->client_capabilities,
                  thd->max_client_packet_length,
                  thd->main_security_ctx.host_or_ip,
                  thd->main_security_ctx.user,
                  thd->main_security_ctx.priv_user,
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                  passwd_len ? "yes": "no",
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                  thd->main_security_ctx.master_access,
                  (thd->db ? thd->db : "*none*")));
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      if (check_count)
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      {
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        VOID(pthread_mutex_lock(&LOCK_thread_count));
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        bool count_ok= thread_count <= max_connections + delayed_insert_threads
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                       || (thd->main_security_ctx.master_access & SUPER_ACL);
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        VOID(pthread_mutex_unlock(&LOCK_thread_count));
        if (!count_ok)
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        {                                         // too many connections
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          net_send_error(thd, ER_CON_COUNT_ERROR);
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          DBUG_RETURN(-1);
        }
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      }
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      /* Why logging is performed before all checks've passed? */
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      mysql_log.write(thd, command,
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                      (thd->main_security_ctx.priv_user ==
                       thd->main_security_ctx.user ?
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                       (char*) "%s@%s on %s" :
                       (char*) "%s@%s as anonymous on %s"),
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                      thd->main_security_ctx.user,
                      thd->main_security_ctx.host_or_ip,
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                      db ? db : (char*) "");

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      /*
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        This is the default access rights for the current database.  It's
        set to 0 here because we don't have an active database yet (and we
        may not have an active database to set.
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      */
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      thd->main_security_ctx.db_access=0;
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      /* Don't allow user to connect if he has done too many queries */
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      if ((ur.questions || ur.updates || ur.conn_per_hour || ur.user_conn ||
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	   max_user_connections) &&
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	  get_or_create_user_conn(thd,
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            (opt_old_style_user_limits ? thd->main_security_ctx.user :
             thd->main_security_ctx.priv_user),
            (opt_old_style_user_limits ? thd->main_security_ctx.host_or_ip :
             thd->main_security_ctx.priv_host),
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            &ur))
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	DBUG_RETURN(-1);
      if (thd->user_connect &&
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	  (thd->user_connect->user_resources.conn_per_hour ||
	   thd->user_connect->user_resources.user_conn ||
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	   max_user_connections) &&
	  check_for_max_user_connections(thd, thd->user_connect))
	DBUG_RETURN(-1);
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      /* Change database if necessary */
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      if (db && db[0])
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      {
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        if (mysql_change_db(thd, db, FALSE))
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        {
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          /* Send error to the client */
          net_send_error(thd);
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          if (thd->user_connect)
            decrease_user_connections(thd->user_connect);
          DBUG_RETURN(-1);
        }
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      }
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      send_ok(thd);
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      thd->password= test(passwd_len);          // remember for error messages 
      /* Ready to handle queries */
      DBUG_RETURN(0);
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    }
  }
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  else if (res == 2) // client gave short hash, server has long hash
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  {
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    net_printf_error(thd, ER_NOT_SUPPORTED_AUTH_MODE);
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    mysql_log.write(thd,COM_CONNECT,ER(ER_NOT_SUPPORTED_AUTH_MODE));
    DBUG_RETURN(-1);
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  }
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  net_printf_error(thd, ER_ACCESS_DENIED_ERROR,
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                   thd->main_security_ctx.user,
                   thd->main_security_ctx.host_or_ip,
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                   passwd_len ? ER(ER_YES) : ER(ER_NO));
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  mysql_log.write(thd, COM_CONNECT, ER(ER_ACCESS_DENIED_ERROR),
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                  thd->main_security_ctx.user,
                  thd->main_security_ctx.host_or_ip,
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                  passwd_len ? ER(ER_YES) : ER(ER_NO));
  DBUG_RETURN(-1);
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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}

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/*
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  Check for maximum allowable user connections, if the mysqld server is
  started with corresponding variable that is greater then 0.
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*/

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extern "C" byte *get_key_conn(user_conn *buff, uint *length,
			      my_bool not_used __attribute__((unused)))
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{
  *length=buff->len;
  return (byte*) buff->user;
}

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extern "C" void free_user(struct user_conn *uc)
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{
  my_free((char*) uc,MYF(0));
}

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void init_max_user_conn(void)
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{
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  (void) hash_init(&hash_user_connections,system_charset_info,max_connections,
		   0,0,
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		   (hash_get_key) get_key_conn, (hash_free_key) free_user,
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		   0);
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#endif
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}


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/*
  check if user has already too many connections
  
  SYNOPSIS
  check_for_max_user_connections()
  thd			Thread handle
  uc			User connect object

  NOTES
    If check fails, we decrease user connection count, which means one
    shouldn't call decrease_user_connections() after this function.

  RETURN
    0	ok
    1	error
*/

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#ifndef NO_EMBEDDED_ACCESS_CHECKS

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static int check_for_max_user_connections(THD *thd, USER_CONN *uc)
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{
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  int error=0;
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  DBUG_ENTER("check_for_max_user_connections");
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  (void) pthread_mutex_lock(&LOCK_user_conn);
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  if (max_user_connections && !uc->user_resources.user_conn &&
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      max_user_connections < (uint) uc->connections)
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  {
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    net_printf_error(thd, ER_TOO_MANY_USER_CONNECTIONS, uc->user);
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    error=1;
    goto end;
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  }
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  time_out_user_resource_limits(thd, uc);
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  if (uc->user_resources.user_conn &&
      uc->user_resources.user_conn < uc->connections)
  {
    net_printf_error(thd, ER_USER_LIMIT_REACHED, uc->user,
                     "max_user_connections",
                     (long) uc->user_resources.user_conn);
    error= 1;
    goto end;
  }
  if (uc->user_resources.conn_per_hour &&
      uc->user_resources.conn_per_hour <= uc->conn_per_hour)
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  {
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    net_printf_error(thd, ER_USER_LIMIT_REACHED, uc->user,
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                     "max_connections_per_hour",
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                     (long) uc->user_resources.conn_per_hour);
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    error=1;
    goto end;
  }
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  uc->conn_per_hour++;
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  end:
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  if (error)
    uc->connections--; // no need for decrease_user_connections() here
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  (void) pthread_mutex_unlock(&LOCK_user_conn);
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  DBUG_RETURN(error);
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}

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/*
  Decrease user connection count

  SYNOPSIS
    decrease_user_connections()
    uc			User connection object

  NOTES
    If there is a n user connection object for a connection
    (which only happens if 'max_user_connections' is defined or
    if someone has created a resource grant for a user), then
    the connection count is always incremented on connect.

    The user connect object is not freed if some users has
    'max connections per hour' defined as we need to be able to hold
    count over the lifetime of the connection.
*/

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static void decrease_user_connections(USER_CONN *uc)
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{
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  DBUG_ENTER("decrease_user_connections");
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  (void) pthread_mutex_lock(&LOCK_user_conn);
  DBUG_ASSERT(uc->connections);
  if (!--uc->connections && !mqh_used)
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  {
    /* Last connection for user; Delete it */
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    (void) hash_delete(&hash_user_connections,(byte*) uc);
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  }
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  (void) pthread_mutex_unlock(&LOCK_user_conn);
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  DBUG_VOID_RETURN;
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}

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#endif /* NO_EMBEDDED_ACCESS_CHECKS */

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void free_max_user_conn(void)
{
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  hash_free(&hash_user_connections);
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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}

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/*
  Mark all commands that somehow changes a table
  This is used to check number of updates / hour
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  sql_command is actually set to SQLCOM_END sometimes
  so we need the +1 to include it in the array.
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  numbers are:
     0  - read-only query
  != 0  - query that may change a table
     2  - query that returns meaningful ROW_COUNT() -
          a number of modified rows
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*/

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char  uc_update_queries[SQLCOM_END+1];
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void init_update_queries(void)
{
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  bzero((gptr) &uc_update_queries, sizeof(uc_update_queries));

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  uc_update_queries[SQLCOM_CREATE_TABLE]=1;
  uc_update_queries[SQLCOM_CREATE_INDEX]=1;
  uc_update_queries[SQLCOM_ALTER_TABLE]=1;
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  uc_update_queries[SQLCOM_UPDATE]=2;
  uc_update_queries[SQLCOM_UPDATE_MULTI]=2;
  uc_update_queries[SQLCOM_INSERT]=2;
  uc_update_queries[SQLCOM_INSERT_SELECT]=2;
  uc_update_queries[SQLCOM_DELETE]=2;
  uc_update_queries[SQLCOM_DELETE_MULTI]=2;
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  uc_update_queries[SQLCOM_TRUNCATE]=1;
  uc_update_queries[SQLCOM_DROP_TABLE]=1;
  uc_update_queries[SQLCOM_LOAD]=1;
  uc_update_queries[SQLCOM_CREATE_DB]=1;
  uc_update_queries[SQLCOM_DROP_DB]=1;
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  uc_update_queries[SQLCOM_REPLACE]=2;
  uc_update_queries[SQLCOM_REPLACE_SELECT]=2;
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  uc_update_queries[SQLCOM_RENAME_TABLE]=1;
  uc_update_queries[SQLCOM_BACKUP_TABLE]=1;
  uc_update_queries[SQLCOM_RESTORE_TABLE]=1;
  uc_update_queries[SQLCOM_DROP_INDEX]=1;
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  uc_update_queries[SQLCOM_CREATE_VIEW]=1;
  uc_update_queries[SQLCOM_DROP_VIEW]=1;
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}

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bool is_update_query(enum enum_sql_command command)
{
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  DBUG_ASSERT(command >= 0 && command <= SQLCOM_END);
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  return uc_update_queries[command] != 0;
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}
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/*
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  Reset per-hour user resource limits when it has been more than
  an hour since they were last checked
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  SYNOPSIS:
    time_out_user_resource_limits()
    thd			Thread handler
    uc			User connection details
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  NOTE:
    This assumes that the LOCK_user_conn mutex has been acquired, so it is
    safe to test and modify members of the USER_CONN structure.
*/
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#ifndef NO_EMBEDDED_ACCESS_CHECKS

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static void time_out_user_resource_limits(THD *thd, USER_CONN *uc)
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{
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  time_t check_time = thd->start_time ?  thd->start_time : time(NULL);
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  DBUG_ENTER("time_out_user_resource_limits");
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  /* If more than a hour since last check, reset resource checking */
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  if (check_time  - uc->intime >= 3600)
  {
    uc->questions=1;
    uc->updates=0;
    uc->conn_per_hour=0;
    uc->intime=check_time;
  }
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  DBUG_VOID_RETURN;
}

/*
  Check if maximum queries per hour limit has been reached
  returns 0 if OK.
*/

static bool check_mqh(THD *thd, uint check_command)
{
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  bool error= 0;
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  USER_CONN *uc=thd->user_connect;
  DBUG_ENTER("check_mqh");
  DBUG_ASSERT(uc != 0);

  (void) pthread_mutex_lock(&LOCK_user_conn);

  time_out_user_resource_limits(thd, uc);

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  /* Check that we have not done too many questions / hour */
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  if (uc->user_resources.questions &&
      uc->questions++ >= uc->user_resources.questions)
  {
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    net_printf_error(thd, ER_USER_LIMIT_REACHED, uc->user, "max_questions",
                     (long) uc->user_resources.questions);
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    error=1;
    goto end;
  }
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  if (check_command < (uint) SQLCOM_END)
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  {
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    /* Check that we have not done too many updates / hour */
    if (uc->user_resources.updates && uc_update_queries[check_command] &&
	uc->updates++ >= uc->user_resources.updates)
    {
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      net_printf_error(thd, ER_USER_LIMIT_REACHED, uc->user, "max_updates",
                       (long) uc->user_resources.updates);
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      error=1;
      goto end;
    }
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  }
end:
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  (void) pthread_mutex_unlock(&LOCK_user_conn);
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  DBUG_RETURN(error);
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}

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#endif /* NO_EMBEDDED_ACCESS_CHECKS */

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static void reset_mqh(LEX_USER *lu, bool get_them= 0)
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{
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  (void) pthread_mutex_lock(&LOCK_user_conn);
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  if (lu)  // for GRANT
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  {
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    USER_CONN *uc;
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    uint temp_len=lu->user.length+lu->host.length+2;
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    char temp_user[USER_HOST_BUFF_SIZE];
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    memcpy(temp_user,lu->user.str,lu->user.length);
    memcpy(temp_user+lu->user.length+1,lu->host.str,lu->host.length);
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    temp_user[lu->user.length]='\0'; temp_user[temp_len-1]=0;
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    if ((uc = (struct  user_conn *) hash_search(&hash_user_connections,
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						(byte*) temp_user, temp_len)))
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    {
      uc->questions=0;
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      get_mqh(temp_user,&temp_user[lu->user.length+1],uc);
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      uc->updates=0;
      uc->conn_per_hour=0;
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    }
  }
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  else
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  {
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    /* for FLUSH PRIVILEGES and FLUSH USER_RESOURCES */
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    for (uint idx=0;idx < hash_user_connections.records; idx++)
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    {
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      USER_CONN *uc=(struct user_conn *) hash_element(&hash_user_connections,
						      idx);
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      if (get_them)
	get_mqh(uc->user,uc->host,uc);
      uc->questions=0;
      uc->updates=0;
      uc->conn_per_hour=0;
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    }
  }
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  (void) pthread_mutex_unlock(&LOCK_user_conn);
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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}
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void thd_init_client_charset(THD *thd, uint cs_number)
{
  /*
   Use server character set and collation if
   - opt_character_set_client_handshake is not set
   - client has not specified a character set
   - client character set is the same as the servers
   - client character set doesn't exists in server
  */
  if (!opt_character_set_client_handshake ||
      !(thd->variables.character_set_client= get_charset(cs_number, MYF(0))) ||
      !my_strcasecmp(&my_charset_latin1,
                     global_system_variables.character_set_client->name,
                     thd->variables.character_set_client->name))
  {
    thd->variables.character_set_client=
      global_system_variables.character_set_client;
    thd->variables.collation_connection=
      global_system_variables.collation_connection;
    thd->variables.character_set_results=
      global_system_variables.character_set_results;
  }
  else
  {
    thd->variables.character_set_results=
      thd->variables.collation_connection= 
      thd->variables.character_set_client;
  }
}


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/*
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    Perform handshake, authorize client and update thd ACL variables.
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  SYNOPSIS
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    check_connection()
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    thd  thread handle
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  RETURN
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     0  success, OK is sent to user, thd is updated.
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    -1  error, which is sent to user
   > 0  error code (not sent to user)
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*/

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#ifndef EMBEDDED_LIBRARY
static int check_connection(THD *thd)
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{
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  uint connect_errors= 0;
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  NET *net= &thd->net;
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  ulong pkt_len= 0;
  char *end;
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  DBUG_PRINT("info",
             ("New connection received on %s", vio_description(net->vio)));
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#ifdef SIGNAL_WITH_VIO_CLOSE
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  thd->set_active_vio(net->vio);
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#endif
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  if (!thd->main_security_ctx.host)         // If TCP/IP connection
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  {
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    char ip[30];
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    if (vio_peer_addr(net->vio, ip, &thd->peer_port))
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      return (ER_BAD_HOST_ERROR);
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    if (!(thd->main_security_ctx.ip= my_strdup(ip,MYF(0))))
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      return (ER_OUT_OF_RESOURCES);
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    thd->main_security_ctx.host_or_ip= thd->main_security_ctx.ip;
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    vio_in_addr(net->vio,&thd->remote.sin_addr);
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    if (!(specialflag & SPECIAL_NO_RESOLVE))
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    {
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      vio_in_addr(net->vio,&thd->remote.sin_addr);
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      thd->main_security_ctx.host=
        ip_to_hostname(&thd->remote.sin_addr, &connect_errors);
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      /* Cut very long hostnames to avoid possible overflows */
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      if (thd->main_security_ctx.host)
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      {
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        if (thd->main_security_ctx.host != my_localhost)
          thd->main_security_ctx.host[min(strlen(thd->main_security_ctx.host),
                                          HOSTNAME_LENGTH)]= 0;
        thd->main_security_ctx.host_or_ip= thd->main_security_ctx.host;
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      }
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      if (connect_errors > max_connect_errors)
        return(ER_HOST_IS_BLOCKED);
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    }
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    DBUG_PRINT("info",("Host: %s  ip: %s",
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		       (thd->main_security_ctx.host ?
                        thd->main_security_ctx.host : "unknown host"),
		       (thd->main_security_ctx.ip ?
                        thd->main_security_ctx.ip : "unknown ip")));
    if (acl_check_host(thd->main_security_ctx.host, thd->main_security_ctx.ip))
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      return(ER_HOST_NOT_PRIVILEGED);
  }
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  else /* Hostname given means that the connection was on a socket */
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  {
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    DBUG_PRINT("info",("Host: %s", thd->main_security_ctx.host));
    thd->main_security_ctx.host_or_ip= thd->main_security_ctx.host;
    thd->main_security_ctx.ip= 0;
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    /* Reset sin_addr */
    bzero((char*) &thd->remote, sizeof(thd->remote));
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  }
  vio_keepalive(net->vio, TRUE);
  {
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    /* buff[] needs to big enough to hold the server_version variable */
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    char buff[SERVER_VERSION_LENGTH + SCRAMBLE_LENGTH + 64];
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    ulong client_flags = (CLIENT_LONG_FLAG | CLIENT_CONNECT_WITH_DB |
			  CLIENT_PROTOCOL_41 | CLIENT_SECURE_CONNECTION);
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    if (opt_using_transactions)
      client_flags|=CLIENT_TRANSACTIONS;
#ifdef HAVE_COMPRESS
    client_flags |= CLIENT_COMPRESS;
#endif /* HAVE_COMPRESS */
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#ifdef HAVE_OPENSSL
    if (ssl_acceptor_fd)
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      client_flags |= CLIENT_SSL;       /* Wow, SSL is available! */
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#endif /* HAVE_OPENSSL */
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    end= strnmov(buff, server_version, SERVER_VERSION_LENGTH) + 1;
    int4store((uchar*) end, thd->thread_id);
    end+= 4;
    /*
      So as check_connection is the only entry point to authorization
      procedure, scramble is set here. This gives us new scramble for
      each handshake.
    */
    create_random_string(thd->scramble, SCRAMBLE_LENGTH, &thd->rand);
    /*
      Old clients does not understand long scrambles, but can ignore packet
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      tail: that's why first part of the scramble is placed here, and second
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      part at the end of packet.
    */
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    end= strmake(end, thd->scramble, SCRAMBLE_LENGTH_323) + 1;
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    int2store(end, client_flags);
    /* write server characteristics: up to 16 bytes allowed */
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    end[2]=(char) default_charset_info->number;
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    int2store(end+3, thd->server_status);
    bzero(end+5, 13);
    end+= 18;
    /* write scramble tail */
    end= strmake(end, thd->scramble + SCRAMBLE_LENGTH_323, 
                 SCRAMBLE_LENGTH - SCRAMBLE_LENGTH_323) + 1;

    /* At this point we write connection message and read reply */
    if (net_write_command(net, (uchar) protocol_version, "", 0, buff,
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			  (uint) (end-buff)) ||
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	(pkt_len= my_net_read(net)) == packet_error ||
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	pkt_len < MIN_HANDSHAKE_SIZE)
    {
      inc_host_errors(&thd->remote.sin_addr);
      return(ER_HANDSHAKE_ERROR);
    }
  }
#ifdef _CUSTOMCONFIG_
#include "_cust_sql_parse.h"
#endif
  if (connect_errors)
    reset_host_errors(&thd->remote.sin_addr);
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  if (thd->packet.alloc(thd->variables.net_buffer_length))
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    return(ER_OUT_OF_RESOURCES);

  thd->client_capabilities=uint2korr(net->read_pos);
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  if (thd->client_capabilities & CLIENT_PROTOCOL_41)
  {
    thd->client_capabilities|= ((ulong) uint2korr(net->read_pos+2)) << 16;
    thd->max_client_packet_length= uint4korr(net->read_pos+4);
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    DBUG_PRINT("info", ("client_character_set: %d", (uint) net->read_pos[8]));
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    thd_init_client_charset(thd, (uint) net->read_pos[8]);
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    thd->update_charset();
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    end= (char*) net->read_pos+32;
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  }
  else
  {
    thd->max_client_packet_length= uint3korr(net->read_pos+2);
    end= (char*) net->read_pos+5;
  }

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  if (thd->client_capabilities & CLIENT_IGNORE_SPACE)
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    thd->variables.sql_mode|= MODE_IGNORE_SPACE;
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#ifdef HAVE_OPENSSL
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  DBUG_PRINT("info", ("client capabilities: %lu", thd->client_capabilities));
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  if (thd->client_capabilities & CLIENT_SSL)
  {
    /* Do the SSL layering. */
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    if (!ssl_acceptor_fd)
    {
      inc_host_errors(&thd->remote.sin_addr);
      return(ER_HANDSHAKE_ERROR);
    }
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    DBUG_PRINT("info", ("IO layer change in progress..."));
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    if (sslaccept(ssl_acceptor_fd, net->vio, net->read_timeout))
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    {
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      DBUG_PRINT("error", ("Failed to accept new SSL connection"));
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      inc_host_errors(&thd->remote.sin_addr);
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      return(ER_HANDSHAKE_ERROR);
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    }
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    DBUG_PRINT("info", ("Reading user information over SSL layer"));
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    if ((pkt_len= my_net_read(net)) == packet_error ||
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	pkt_len < NORMAL_HANDSHAKE_SIZE)
    {
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      DBUG_PRINT("error", ("Failed to read user information (pkt_len= %lu)",
			   pkt_len));
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      inc_host_errors(&thd->remote.sin_addr);
      return(ER_HANDSHAKE_ERROR);
    }
  }
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#endif

  if (end >= (char*) net->read_pos+ pkt_len +2)
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  {
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    inc_host_errors(&thd->remote.sin_addr);
    return(ER_HANDSHAKE_ERROR);
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  }

  if (thd->client_capabilities & CLIENT_INTERACTIVE)
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    thd->variables.net_wait_timeout= thd->variables.net_interactive_timeout;
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  if ((thd->client_capabilities & CLIENT_TRANSACTIONS) &&
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      opt_using_transactions)
    net->return_status= &thd->server_status;
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  char *user= end;
  char *passwd= strend(user)+1;
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  uint user_len= passwd - user - 1;
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  char *db= passwd;
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  char db_buff[NAME_LEN + 1];           // buffer to store db in utf8
  char user_buff[USERNAME_LENGTH + 1];	// buffer to store user in utf8
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  uint dummy_errors;

  /*
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    Old clients send null-terminated string as password; new clients send
    the size (1 byte) + string (not null-terminated). Hence in case of empty
    password both send '\0'.
  */
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  uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ?
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    *passwd++ : strlen(passwd);
  db= thd->client_capabilities & CLIENT_CONNECT_WITH_DB ?
    db + passwd_len + 1 : 0;
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  uint db_len= db ? strlen(db) : 0;

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  if (passwd + passwd_len + db_len > (char *)net->read_pos + pkt_len)
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  {
    inc_host_errors(&thd->remote.sin_addr);
    return ER_HANDSHAKE_ERROR;
  }
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  /* Since 4.1 all database names are stored in utf8 */
  if (db)
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  {
1025 1026
    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
                             system_charset_info,
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                             db, db_len,
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                             thd->charset(), &dummy_errors)]= 0;
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    db= db_buff;
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  }
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  user_buff[user_len= copy_and_convert(user_buff, sizeof(user_buff)-1,
                                       system_charset_info, user, user_len,
                                       thd->charset(), &dummy_errors)]= '\0';
1035
  user= user_buff;
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1037 1038 1039 1040 1041 1042 1043 1044
  /* If username starts and ends in "'", chop them off */
  if (user_len > 1 && user[0] == '\'' && user[user_len - 1] == '\'')
  {
    user[user_len-1]= 0;
    user++;
    user_len-= 2;
  }

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  if (thd->main_security_ctx.user)
    x_free(thd->main_security_ctx.user);
  if (!(thd->main_security_ctx.user= my_strdup(user, MYF(0))))
1048
    return (ER_OUT_OF_RESOURCES);
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  return check_user(thd, COM_CONNECT, passwd, passwd_len, db, TRUE);
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}

1052

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void execute_init_command(THD *thd, sys_var_str *init_command_var,
			  rw_lock_t *var_mutex)
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{
  Vio* save_vio;
  ulong save_client_capabilities;

1059 1060 1061 1062 1063 1064 1065 1066 1067
  thd->proc_info= "Execution of init_command";
  /*
    We need to lock init_command_var because
    during execution of init_command_var query
    values of init_command_var can't be changed
  */
  rw_rdlock(var_mutex);
  thd->query= init_command_var->value;
  thd->query_length= init_command_var->value_length;
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  save_client_capabilities= thd->client_capabilities;
  thd->client_capabilities|= CLIENT_MULTI_QUERIES;
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  /*
    We don't need return result of execution to client side.
    To forbid this we should set thd->net.vio to 0.
  */
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  save_vio= thd->net.vio;
  thd->net.vio= 0;
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  thd->net.no_send_error= 0;
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  dispatch_command(COM_QUERY, thd, thd->query, thd->query_length+1);
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  rw_unlock(var_mutex);
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  thd->client_capabilities= save_client_capabilities;
  thd->net.vio= save_vio;
}


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pthread_handler_t handle_one_connection(void *arg)
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{
  THD *thd=(THD*) arg;
  uint launch_time  =
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    (uint) ((thd->thr_create_time = time(NULL)) - thd->connect_time);
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  if (launch_time >= slow_launch_time)
    statistic_increment(slow_launch_threads,&LOCK_status );

  pthread_detach_this_thread();

1094
#if !defined( __WIN__) && !defined(OS2)	// Win32 calls this in pthread_create
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  /* The following calls needs to be done before we call DBUG_ macros */
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  if (!(test_flags & TEST_NO_THREADS) & my_thread_init())
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  {
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    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
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    statistic_increment(aborted_connects,&LOCK_status);
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    end_thread(thd,0);
    return 0;
  }
#endif

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  /*
    handle_one_connection() is the only way a thread would start
    and would always be on top of the stack, therefore, the thread
    stack always starts at the address of the first local variable
    of handle_one_connection, which is thd. We need to know the
    start of the stack so that we could check for stack overruns.
  */
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  DBUG_PRINT("info", ("handle_one_connection called by thread %lu\n",
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		      thd->thread_id));
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  /* now that we've called my_thread_init(), it is safe to call DBUG_* */
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#if defined(__WIN__)
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  init_signals();
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#elif !defined(OS2) && !defined(__NETWARE__)
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  sigset_t set;
  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
#endif
1123
  thd->thread_stack= (char*) &thd;
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  if (thd->store_globals())
  {
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    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
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    statistic_increment(aborted_connects,&LOCK_status);
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    end_thread(thd,0);
    return 0;
  }

  do
  {
    int error;
    NET *net= &thd->net;
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    Security_context *sctx= thd->security_ctx;
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    net->no_send_error= 0;
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    /* Use "connect_timeout" value during connection phase */
    net_set_read_timeout(net, connect_timeout);
    net_set_write_timeout(net, connect_timeout);

1143
    if ((error=check_connection(thd)))
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    {						// Wrong permissions
      if (error > 0)
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	net_printf_error(thd, error, sctx->host_or_ip);
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#ifdef __NT__
      if (vio_type(net->vio) == VIO_TYPE_NAMEDPIPE)
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	my_sleep(1000);				/* must wait after eof() */
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#endif
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      statistic_increment(aborted_connects,&LOCK_status);
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      goto end_thread;
    }
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#ifdef __NETWARE__
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    netware_reg_user(sctx->ip, sctx->user, "MySQL");
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#endif
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    if (thd->variables.max_join_size == HA_POS_ERROR)
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      thd->options |= OPTION_BIG_SELECTS;
    if (thd->client_capabilities & CLIENT_COMPRESS)
      net->compress=1;				// Use compression

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    thd->version= refresh_version;
1163
    thd->proc_info= 0;
1164
    thd->command= COM_SLEEP;
1165
    thd->init_for_queries();
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    if (sys_init_connect.value_length && !(sctx->master_access & SUPER_ACL))
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    {
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      execute_init_command(thd, &sys_init_connect, &LOCK_sys_init_connect);
      if (thd->query_error)
1171
      {
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	thd->killed= THD::KILL_CONNECTION;
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        sql_print_warning(ER(ER_NEW_ABORTING_CONNECTION),
                          thd->thread_id,(thd->db ? thd->db : "unconnected"),
                          sctx->user ? sctx->user : "unauthenticated",
                          sctx->host_or_ip, "init_connect command failed");
        sql_print_warning("%s", net->last_error);
      }
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      thd->proc_info=0;
      thd->init_for_queries();
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    }

1183 1184 1185 1186
    /* Connect completed, set read/write timeouts back to tdefault */
    net_set_read_timeout(net, thd->variables.net_read_timeout);
    net_set_write_timeout(net, thd->variables.net_write_timeout);

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    while (!net->error && net->vio != 0 &&
           !(thd->killed == THD::KILL_CONNECTION))
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    {
1190
      net->no_send_error= 0;
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      if (do_command(thd))
	break;
    }
1194 1195
    if (thd->user_connect)
      decrease_user_connections(thd->user_connect);
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    if (net->error && net->vio != 0 && net->report_error)
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    {
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      if (!thd->killed && thd->variables.log_warnings > 1)
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	sql_print_warning(ER(ER_NEW_ABORTING_CONNECTION),
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                          thd->thread_id,(thd->db ? thd->db : "unconnected"),
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                          sctx->user ? sctx->user : "unauthenticated",
                          sctx->host_or_ip,
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                          (net->last_errno ? ER(net->last_errno) :
                           ER(ER_UNKNOWN_ERROR)));
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      net_send_error(thd, net->last_errno, NullS);
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      statistic_increment(aborted_threads,&LOCK_status);
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    }
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    else if (thd->killed)
    {
      statistic_increment(aborted_threads,&LOCK_status);
    }
1212
    
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end_thread:
1214
    close_connection(thd, 0, 1);
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    end_thread(thd,1);
    /*
      If end_thread returns, we are either running with --one-thread
      or this thread has been schedule to handle the next query
    */
    thd= current_thd;
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    thd->thread_stack= (char*) &thd;
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  } while (!(test_flags & TEST_NO_THREADS));
  /* The following is only executed if we are not using --one-thread */
  return(0);					/* purecov: deadcode */
}

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#endif /* EMBEDDED_LIBRARY */

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/*
  Execute commands from bootstrap_file.
  Used when creating the initial grant tables
*/
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1234
pthread_handler_t handle_bootstrap(void *arg)
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{
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  THD *thd=(THD*) arg;
  FILE *file=bootstrap_file;
  char *buff;
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  /* The following must be called before DBUG_ENTER */
1241
  thd->thread_stack= (char*) &thd;
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  if (my_thread_init() || thd->store_globals())
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  {
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#ifndef EMBEDDED_LIBRARY
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    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
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#endif
1247
    thd->fatal_error();
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    goto end;
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  }
1250 1251
  DBUG_ENTER("handle_bootstrap");

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#ifndef EMBEDDED_LIBRARY
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  pthread_detach_this_thread();
  thd->thread_stack= (char*) &thd;
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#if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__)
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  sigset_t set;
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  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
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#endif
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#endif /* EMBEDDED_LIBRARY */
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1262
  if (thd->variables.max_join_size == HA_POS_ERROR)
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    thd->options |= OPTION_BIG_SELECTS;

  thd->proc_info=0;
  thd->version=refresh_version;
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  thd->security_ctx->priv_user=
    thd->security_ctx->user= (char*) my_strdup("boot", MYF(MY_WME));
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  /*
    Make the "client" handle multiple results. This is necessary
    to enable stored procedures with SELECTs and Dynamic SQL
    in init-file.
  */
  thd->client_capabilities|= CLIENT_MULTI_RESULTS;
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  buff= (char*) thd->net.buff;
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  thd->init_for_queries();
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  while (fgets(buff, thd->net.max_packet, file))
  {
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   ulong length= (ulong) strlen(buff);
   while (buff[length-1] != '\n' && !feof(file))
   {
     /*
       We got only a part of the current string. Will try to increase
       net buffer then read the rest of the current string.
     */
     if (net_realloc(&(thd->net), 2 * thd->net.max_packet))
     {
       net_send_error(thd, ER_NET_PACKET_TOO_LARGE, NullS);
       thd->fatal_error();
       break;
     }
     buff= (char*) thd->net.buff;
     fgets(buff + length, thd->net.max_packet - length, file);
     length+= (ulong) strlen(buff + length);
   }
   if (thd->is_fatal_error)
     break;

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    while (length && (my_isspace(thd->charset(), buff[length-1]) ||
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           buff[length-1] == ';'))
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      length--;
    buff[length]=0;
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    thd->query_length=length;
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    thd->query= thd->memdup_w_gap(buff, length+1, 
				  thd->db_length+1+QUERY_CACHE_FLAGS_SIZE);
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    thd->query[length] = '\0';
1308
    DBUG_PRINT("query",("%-.4096s",thd->query));
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    /*
      We don't need to obtain LOCK_thread_count here because in bootstrap
      mode we have only one thread.
    */
1313
    thd->query_id=next_query_id();
1314
    thd->set_time();
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    mysql_parse(thd,thd->query,length);
    close_thread_tables(thd);			// Free tables
1317

1318
    if (thd->is_fatal_error)
1319
      break;
1320 1321 1322 1323 1324 1325 1326 1327 1328

    if (thd->net.report_error)
    {
      /* The query failed, send error to log and abort bootstrap */
      net_send_error(thd);
      thd->fatal_error();
      break;
    }

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    free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));
1330
#ifdef USING_TRANSACTIONS
1331
    free_root(&thd->transaction.mem_root,MYF(MY_KEEP_PREALLOC));
1332
#endif
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  }
1334 1335

end:
1336
  /* Remember the exit code of bootstrap */
1337 1338 1339 1340 1341 1342
  bootstrap_error= thd->is_fatal_error;

  net_end(&thd->net);
  thd->cleanup();
  delete thd;

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#ifndef EMBEDDED_LIBRARY
1344 1345 1346
  (void) pthread_mutex_lock(&LOCK_thread_count);
  thread_count--;
  (void) pthread_mutex_unlock(&LOCK_thread_count);
1347
  (void) pthread_cond_broadcast(&COND_thread_count);
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  my_thread_end();
  pthread_exit(0);
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#endif
1351
  DBUG_RETURN(0);
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}


1355 1356 1357 1358
    /* This works because items are allocated with sql_alloc() */

void cleanup_items(Item *item)
{
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  DBUG_ENTER("cleanup_items");  
1360 1361
  for (; item ; item=item->next)
    item->cleanup();
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  DBUG_VOID_RETURN;
1363 1364
}

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/*
  Handle COM_TABLE_DUMP command

  SYNOPSIS
    mysql_table_dump
      thd           thread handle
      db            database name or an empty string. If empty,
                    the current database of the connection is used
      tbl_name      name of the table to dump

  NOTES
    This function is written to handle one specific command only.

  RETURN VALUE
    0               success
    1               error, the error message is set in THD
*/

static
int mysql_table_dump(THD* thd, char* db, char* tbl_name)
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{
  TABLE* table;
  TABLE_LIST* table_list;
  int error = 0;
  DBUG_ENTER("mysql_table_dump");
  db = (db && db[0]) ? db : thd->db;
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  if (!(table_list = (TABLE_LIST*) thd->calloc(sizeof(TABLE_LIST))))
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    DBUG_RETURN(1); // out of memory
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  table_list->db= db;
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  table_list->table_name= table_list->alias= tbl_name;
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  table_list->lock_type= TL_READ_NO_INSERT;
  table_list->prev_global= &table_list;	// can be removed after merge with 4.1
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  if (!db || check_db_name(db))
  {
1400
    my_error(ER_WRONG_DB_NAME ,MYF(0), db ? db : "NULL");
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    goto err;
  }
1403
  if (lower_case_table_names)
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    my_casedn_str(files_charset_info, tbl_name);
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  remove_escape(table_list->table_name);
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  if (!(table=open_ltable(thd, table_list, TL_READ_NO_INSERT)))
    DBUG_RETURN(1);

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  if (check_one_table_access(thd, SELECT_ACL, table_list))
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    goto err;
  thd->free_list = 0;
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  thd->query_length=(uint) strlen(tbl_name);
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  thd->query = tbl_name;
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  if ((error = mysqld_dump_create_info(thd, table_list, -1)))
1416
  {
1417
    my_error(ER_GET_ERRNO, MYF(0), my_errno);
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    goto err;
  }
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  net_flush(&thd->net);
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  if ((error= table->file->dump(thd,-1)))
1422
    my_error(ER_GET_ERRNO, MYF(0), error);
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err:
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  DBUG_RETURN(error);
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}

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/*
  Ends the current transaction and (maybe) begin the next

  SYNOPSIS
1432
    end_trans()
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      thd            Current thread
      completion     Completion type

  RETURN
    0 - OK
*/

1440
int end_trans(THD *thd, enum enum_mysql_completiontype completion)
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{
  bool do_release= 0;
  int res= 0;
1444
  DBUG_ENTER("end_trans");
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1446
  if (unlikely(thd->in_sub_stmt))
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  {
    my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0));
    DBUG_RETURN(1);
  }
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  if (thd->transaction.xid_state.xa_state != XA_NOTR)
  {
    my_error(ER_XAER_RMFAIL, MYF(0),
             xa_state_names[thd->transaction.xid_state.xa_state]);
    DBUG_RETURN(1);
  }
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  switch (completion) {
  case COMMIT:
    /*
     We don't use end_active_trans() here to ensure that this works
     even if there is a problem with the OPTION_AUTO_COMMIT flag
     (Which of course should never happen...)
    */
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
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    res= ha_commit(thd);
1466
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
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    break;
  case COMMIT_RELEASE:
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    do_release= 1; /* fall through */
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  case COMMIT_AND_CHAIN:
    res= end_active_trans(thd);
    if (!res && completion == COMMIT_AND_CHAIN)
      res= begin_trans(thd);
    break;
  case ROLLBACK_RELEASE:
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    do_release= 1; /* fall through */
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  case ROLLBACK:
  case ROLLBACK_AND_CHAIN:
  {
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
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    if (ha_rollback(thd))
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      res= -1;
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
    if (!res && (completion == ROLLBACK_AND_CHAIN))
      res= begin_trans(thd);
    break;
  }
  default:
    res= -1;
    my_error(ER_UNKNOWN_COM_ERROR, MYF(0));
    DBUG_RETURN(-1);
  }
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  if (res < 0)
    my_error(thd->killed_errno(), MYF(0));
  else if ((res == 0) && do_release)
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    thd->killed= THD::KILL_CONNECTION;

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  DBUG_RETURN(res);
}
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1502
#ifndef EMBEDDED_LIBRARY
1503 1504

/*
1505
  Read one command from connection and execute it (query or simple command).
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  This function is called in loop from thread function.
  SYNOPSIS
    do_command()
  RETURN VALUE
    0  success
    1  request of thread shutdown (see dispatch_command() description)
*/

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bool do_command(THD *thd)
{
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  char *packet= 0;
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  ulong packet_length;
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  NET *net= &thd->net;
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  enum enum_server_command command;
  DBUG_ENTER("do_command");

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  /*
    indicator of uninitialized lex => normal flow of errors handling
    (see my_message_sql)
  */
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  thd->lex->current_select= 0;
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  /*
    This thread will do a blocking read from the client which
    will be interrupted when the next command is received from
    the client, the connection is closed or "net_wait_timeout"
    number of seconds has passed
  */
  net_set_read_timeout(net, thd->variables.net_wait_timeout);

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  thd->clear_error();				// Clear error message
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  net_new_transaction(net);
  if ((packet_length=my_net_read(net)) == packet_error)
  {
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    DBUG_PRINT("info",("Got error %d reading command from socket %s",
		       net->error,
		       vio_description(net->vio)));
    /* Check if we can continue without closing the connection */
    if (net->error != 3)
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    {
      statistic_increment(aborted_threads,&LOCK_status);
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      DBUG_RETURN(TRUE);			// We have to close it.
1549
    }
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    net_send_error(thd, net->last_errno, NullS);
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    net->error= 0;
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    DBUG_RETURN(FALSE);
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  }
  else
  {
    packet=(char*) net->read_pos;
    command = (enum enum_server_command) (uchar) packet[0];
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    if (command >= COM_END)
      command= COM_END;				// Wrong command
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    DBUG_PRINT("info",("Command on %s = %d (%s)",
		       vio_description(net->vio), command,
		       command_name[command]));
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  }
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  /* Restore read timeout value */
  net_set_read_timeout(net, thd->variables.net_read_timeout);

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  /*
    packet_length contains length of data, as it was stored in packet
    header. In case of malformed header, packet_length can be zero.
    If packet_length is not zero, my_net_read ensures that this number
    of bytes was actually read from network. Additionally my_net_read
    sets packet[packet_length]= 0 (thus if packet_length == 0,
    command == packet[0] == COM_SLEEP).
    In dispatch_command packet[packet_length] points beyond the end of packet.
  */
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  DBUG_RETURN(dispatch_command(command,thd, packet+1, (uint) packet_length));
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}
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#endif  /* EMBEDDED_LIBRARY */
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/*
   Perform one connection-level (COM_XXXX) command.
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  SYNOPSIS
    dispatch_command()
    thd             connection handle
    command         type of command to perform 
    packet          data for the command, packet is always null-terminated
    packet_length   length of packet + 1 (to show that data is
                    null-terminated) except for COM_SLEEP, where it
                    can be zero.
  RETURN VALUE
    0   ok
    1   request of thread shutdown, i. e. if command is
        COM_QUIT/COM_SHUTDOWN
*/
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bool dispatch_command(enum enum_server_command command, THD *thd,
		      char* packet, uint packet_length)
{
  NET *net= &thd->net;
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  bool error= 0;
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  DBUG_ENTER("dispatch_command");

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  if (thd->killed == THD::KILL_QUERY || thd->killed == THD::KILL_BAD_DATA)
    thd->killed= THD::NOT_KILLED;

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  thd->command=command;
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  /*
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    Commands which always take a long time are logged into
    the slow log only if opt_log_slow_admin_statements is set.
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  */
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  thd->enable_slow_log= TRUE;
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  thd->lex->sql_command= SQLCOM_END; /* to avoid confusing VIEW detectors */
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  thd->set_time();
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  VOID(pthread_mutex_lock(&LOCK_thread_count));
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  thd->query_id= global_query_id;
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  if (command != COM_STATISTICS && command != COM_PING)
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    next_query_id();
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  thread_running++;
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  /* TODO: set thd->lex->sql_command to SQLCOM_END here */
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  VOID(pthread_mutex_unlock(&LOCK_thread_count));
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  thd->server_status&=
           ~(SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED);
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  switch (command) {
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  case COM_INIT_DB:
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  {
    LEX_STRING tmp;
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    statistic_increment(thd->status_var.com_stat[SQLCOM_CHANGE_DB],
			&LOCK_status);
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    thd->convert_string(&tmp, system_charset_info,
			packet, strlen(packet), thd->charset());
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    if (!mysql_change_db(thd, tmp.str, FALSE))
    {
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      mysql_log.write(thd,command,"%s",thd->db);
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      send_ok(thd);
    }
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    break;
  }
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#ifdef HAVE_REPLICATION
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  case COM_REGISTER_SLAVE:
  {
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    if (!register_slave(thd, (uchar*)packet, packet_length))
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      send_ok(thd);
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    break;
  }
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#endif
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  case COM_TABLE_DUMP:
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  {
    char *db, *tbl_name;
    uint db_len= *(uchar*) packet;
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    if (db_len >= packet_length || db_len > NAME_LEN)
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    {
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      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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      break;
    }
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    uint tbl_len= *(uchar*) (packet + db_len + 1);
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    if (db_len+tbl_len+2 > packet_length || tbl_len > NAME_LEN)
    {
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      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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      break;
    }
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    statistic_increment(thd->status_var.com_other, &LOCK_status);
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    thd->enable_slow_log= opt_log_slow_admin_statements;
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    db= thd->alloc(db_len + tbl_len + 2);
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    if (!db)
    {
      my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
      break;
    }
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    tbl_name= strmake(db, packet + 1, db_len)+1;
    strmake(tbl_name, packet + db_len + 2, tbl_len);
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    mysql_table_dump(thd, db, tbl_name);
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    break;
  }
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  case COM_CHANGE_USER:
  {
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    thd->change_user();
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    thd->clear_error();                         // if errors from rollback
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    statistic_increment(thd->status_var.com_other, &LOCK_status);
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    char *user= (char*) packet;
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    char *passwd= strend(user)+1;
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    /*
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      Old clients send null-terminated string ('\0' for empty string) for
      password.  New clients send the size (1 byte) + string (not null
      terminated, so also '\0' for empty string).
    */
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    char db_buff[NAME_LEN+1];               // buffer to store db in utf8
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    char *db= passwd;
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    uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ?
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      *passwd++ : strlen(passwd);
    db+= passwd_len + 1;
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#ifndef EMBEDDED_LIBRARY
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    /* Small check for incoming packet */
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    if ((uint) ((uchar*) db - net->read_pos) > packet_length)
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    {
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      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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      break;
    }
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#endif
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    /* Convert database name to utf8 */
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    uint dummy_errors;
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    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
                             system_charset_info, db, strlen(db),
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                             thd->charset(), &dummy_errors)]= 0;
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    db= db_buff;
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    /* Save user and privileges */
    uint save_db_length= thd->db_length;
    char *save_db= thd->db;
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    Security_context save_security_ctx= *thd->security_ctx;
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    USER_CONN *save_user_connect= thd->user_connect;
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    if (!(thd->security_ctx->user= my_strdup(user, MYF(0))))
1719
    {
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      thd->security_ctx->user= save_security_ctx.user;
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      my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
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      break;
    }
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    /* Clear variables that are allocated */
    thd->user_connect= 0;
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    int res= check_user(thd, COM_CHANGE_USER, passwd, passwd_len, db, FALSE);
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    if (res)
    {
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      /* authentication failure, we shall restore old user */
1732
      if (res > 0)
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        my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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      x_free(thd->security_ctx->user);
      *thd->security_ctx= save_security_ctx;
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      thd->user_connect= save_user_connect;
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      thd->db= save_db;
      thd->db_length= save_db_length;
    }
    else
    {
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
1743
      /* we've authenticated new user */
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      if (save_user_connect)
	decrease_user_connections(save_user_connect);
1746
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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      x_free((gptr) save_db);
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      x_free((gptr)  save_security_ctx.user);
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    }
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    break;
  }
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  case COM_STMT_EXECUTE:
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  {
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    mysql_stmt_execute(thd, packet, packet_length);
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    break;
  }
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  case COM_STMT_FETCH:
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  {
    mysql_stmt_fetch(thd, packet, packet_length);
    break;
  }
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  case COM_STMT_SEND_LONG_DATA:
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  {
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    mysql_stmt_get_longdata(thd, packet, packet_length);
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    break;
  }
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  case COM_STMT_PREPARE:
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  {
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    mysql_stmt_prepare(thd, packet, packet_length);
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    break;
  }
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  case COM_STMT_CLOSE:
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  {
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    mysql_stmt_close(thd, packet);
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    break;
  }
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  case COM_STMT_RESET:
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  {
    mysql_stmt_reset(thd, packet);
    break;
  }
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  case COM_QUERY:
  {
1784 1785
    if (alloc_query(thd, packet, packet_length))
      break;					// fatal error is set
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    char *packet_end= thd->query + thd->query_length;
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    /* 'b' stands for 'buffer' parameter', special for 'my_snprintf' */
    const char *format= "%.*b";
    mysql_log.write(thd,command, format, thd->query_length, thd->query);
1790
    DBUG_PRINT("query",("%-.4096s",thd->query));
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    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),QUERY_PRIOR);

1795
    mysql_parse(thd,thd->query, thd->query_length);
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1797
    while (!thd->killed && thd->lex->found_semicolon && !thd->net.report_error)
1798
    {
1799
      char *next_packet= thd->lex->found_semicolon;
1800
      net->no_send_error= 0;
1801
      /*
1802 1803
        Multiple queries exits, execute them individually
      */
1804 1805
      if (thd->lock || thd->open_tables || thd->derived_tables ||
          thd->prelocked_mode)
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        close_thread_tables(thd);
1807
      ulong length= (ulong)(packet_end - next_packet);
1808

1809
      log_slow_statement(thd);
1810

1811
      /* Remove garbage at start of query */
1812
      while (my_isspace(thd->charset(), *next_packet) && length > 0)
1813
      {
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        next_packet++;
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        length--;
      }
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      VOID(pthread_mutex_lock(&LOCK_thread_count));
1818
      thd->query_length= length;
1819
      thd->query= next_packet;
1820
      thd->query_id= next_query_id();
1821
      thd->set_time(); /* Reset the query start time. */
1822
      /* TODO: set thd->lex->sql_command to SQLCOM_END here */
1823
      VOID(pthread_mutex_unlock(&LOCK_thread_count));
1824
      mysql_parse(thd, next_packet, length);
1825 1826
    }

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    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),WAIT_PRIOR);
    DBUG_PRINT("info",("query ready"));
    break;
  }
1832
  case COM_FIELD_LIST:				// This isn't actually needed
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#ifdef DONT_ALLOW_SHOW_COMMANDS
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    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0));	/* purecov: inspected */
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    break;
#else
  {
1839
    char *fields, *pend;
1840
    /* Locked closure of all tables */
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    TABLE_LIST table_list;
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    LEX_STRING conv_name;
1843

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    /* used as fields initializator */
    lex_start(thd, 0, 0);
1846

1847 1848
    statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_FIELDS],
			&LOCK_status);
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    bzero((char*) &table_list,sizeof(table_list));
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    if (thd->copy_db_to(&table_list.db, 0))
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      break;
1852
    pend= strend(packet);
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    thd->convert_string(&conv_name, system_charset_info,
			packet, (uint) (pend-packet), thd->charset());
1855
    table_list.alias= table_list.table_name= conv_name.str;
1856
    packet= pend+1;
1857 1858 1859 1860 1861 1862 1863 1864 1865

    if (!my_strcasecmp(system_charset_info, table_list.db,
                       information_schema_name.str))
    {
      ST_SCHEMA_TABLE *schema_table= find_schema_table(thd, table_list.alias);
      if (schema_table)
        table_list.schema_table= schema_table;
    }

1866
    thd->query_length= strlen(packet);       // for simplicity: don't optimize
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    if (!(thd->query=fields=thd->memdup(packet,thd->query_length+1)))
      break;
1869
    mysql_log.write(thd,command,"%s %s",table_list.table_name, fields);
1870
    if (lower_case_table_names)
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      my_casedn_str(files_charset_info, table_list.table_name);
    remove_escape(table_list.table_name);	// This can't have wildcards
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    if (check_access(thd,SELECT_ACL,table_list.db,&table_list.grant.privilege,
1875
		     0, 0, test(table_list.schema_table)))
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      break;
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    if (grant_option &&
	check_grant(thd, SELECT_ACL, &table_list, 2, UINT_MAX, 0))
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      break;
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    /* init structures for VIEW processing */
    table_list.select_lex= &(thd->lex->select_lex);
    mysql_init_query(thd, (uchar*)"", 0);
    thd->lex->
      select_lex.table_list.link_in_list((byte*) &table_list,
                                         (byte**) &table_list.next_local);
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    thd->lex->add_to_query_tables(&table_list);
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1888 1889
    /* switch on VIEW optimisation: do not fill temporary tables */
    thd->lex->sql_command= SQLCOM_SHOW_FIELDS;
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    mysqld_list_fields(thd,&table_list,fields);
1891
    thd->lex->unit.cleanup();
1892
    thd->cleanup_after_query();
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    break;
  }
#endif
  case COM_QUIT:
1897
    /* We don't calculate statistics for this command */
1898
    mysql_log.write(thd,command,NullS);
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    net->error=0;				// Don't give 'abort' message
    error=TRUE;					// End server
    break;

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  case COM_CREATE_DB:				// QQ: To be removed
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    {
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      char *db=thd->strdup(packet), *alias;
1906
      HA_CREATE_INFO create_info;
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1908 1909
      statistic_increment(thd->status_var.com_stat[SQLCOM_CREATE_DB],
			  &LOCK_status);
1910
      // null test to handle EOM
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      if (!db || !(alias= thd->strdup(db)) || check_db_name(db))
1912
      {
1913
	my_error(ER_WRONG_DB_NAME, MYF(0), db ? db : "NULL");
1914 1915
	break;
      }
1916
      if (check_access(thd,CREATE_ACL,db,0,1,0,is_schema_db(db)))
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	break;
1918
      mysql_log.write(thd,command,packet);
1919
      bzero(&create_info, sizeof(create_info));
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      mysql_create_db(thd, (lower_case_table_names == 2 ? alias : db),
                      &create_info, 0);
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      break;
    }
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  case COM_DROP_DB:				// QQ: To be removed
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    {
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      statistic_increment(thd->status_var.com_stat[SQLCOM_DROP_DB],
			  &LOCK_status);
1928
      char *db=thd->strdup(packet);
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      /*  null test to handle EOM */
1930
      if (!db || check_db_name(db))
1931
      {
1932
	my_error(ER_WRONG_DB_NAME, MYF(0), db ? db : "NULL");
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	break;
      }
1935
      if (check_access(thd,DROP_ACL,db,0,1,0,is_schema_db(db)))
1936
	break;
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      if (thd->locked_tables || thd->active_transaction())
      {
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	my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                   ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
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	break;
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      }
1943
      mysql_log.write(thd,command,db);
1944
      mysql_rm_db(thd, db, 0, 0);
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      break;
    }
1947
#ifndef EMBEDDED_LIBRARY
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  case COM_BINLOG_DUMP:
    {
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      ulong pos;
      ushort flags;
      uint32 slave_server_id;

1954
      statistic_increment(thd->status_var.com_other,&LOCK_status);
1955
      thd->enable_slow_log= opt_log_slow_admin_statements;
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      if (check_global_access(thd, REPL_SLAVE_ACL))
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	break;
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1959
      /* TODO: The following has to be changed to an 8 byte integer */
1960 1961
      pos = uint4korr(packet);
      flags = uint2korr(packet + 4);
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      thd->server_id=0; /* avoid suicide */
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      if ((slave_server_id= uint4korr(packet+6))) // mysqlbinlog.server_id==0
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	kill_zombie_dump_threads(slave_server_id);
1965
      thd->server_id = slave_server_id;
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      mysql_log.write(thd, command, "Log: '%s'  Pos: %ld", packet+10,
                      (long) pos);
1969
      mysql_binlog_send(thd, thd->strdup(packet + 10), (my_off_t) pos, flags);
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      unregister_slave(thd,1,1);
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      /*  fake COM_QUIT -- if we get here, the thread needs to terminate */
1972 1973
      error = TRUE;
      net->error = 0;
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      break;
    }
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#endif
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  case COM_REFRESH:
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  {
    bool not_used;
    statistic_increment(thd->status_var.com_stat[SQLCOM_FLUSH],
                        &LOCK_status);
    ulong options= (ulong) (uchar) packet[0];
    if (check_global_access(thd,RELOAD_ACL))
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      break;
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    mysql_log.write(thd,command,NullS);
    if (!reload_acl_and_cache(thd, options, (TABLE_LIST*) 0, &not_used))
      send_ok(thd);
    break;
  }
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#ifndef EMBEDDED_LIBRARY
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  case COM_SHUTDOWN:
1992
  {
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    statistic_increment(thd->status_var.com_other, &LOCK_status);
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    if (check_global_access(thd,SHUTDOWN_ACL))
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      break; /* purecov: inspected */
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    /*
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      If the client is < 4.1.3, it is going to send us no argument; then
      packet_length is 1, packet[0] is the end 0 of the packet. Note that
      SHUTDOWN_DEFAULT is 0. If client is >= 4.1.3, the shutdown level is in
      packet[0].
2001
    */
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    enum mysql_enum_shutdown_level level=
      (enum mysql_enum_shutdown_level) (uchar) packet[0];
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    DBUG_PRINT("quit",("Got shutdown command for level %u", level));
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    if (level == SHUTDOWN_DEFAULT)
      level= SHUTDOWN_WAIT_ALL_BUFFERS; // soon default will be configurable
    else if (level != SHUTDOWN_WAIT_ALL_BUFFERS)
    {
      my_error(ER_NOT_SUPPORTED_YET, MYF(0), "this shutdown level");
      break;
    }
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    DBUG_PRINT("quit",("Got shutdown command for level %u", level));
2013
    mysql_log.write(thd,command,NullS);
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    send_eof(thd);
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#ifdef __WIN__
    sleep(1);					// must wait after eof()
#endif
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#ifndef OS2
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    send_eof(thd);				// This is for 'quit request'
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#endif
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    close_connection(thd, 0, 1);
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    close_thread_tables(thd);			// Free before kill
    kill_mysql();
    error=TRUE;
    break;
2026
  }
2027
#endif
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  case COM_STATISTICS:
  {
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    mysql_log.write(thd,command,NullS);
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    statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_STATUS],
			&LOCK_status);
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#ifndef EMBEDDED_LIBRARY
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    char buff[200];
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#else
    char *buff= thd->net.last_error;
#endif
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    STATUS_VAR current_global_status_var;
    calc_sum_of_all_status(&current_global_status_var);

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    ulong uptime = (ulong) (thd->start_time - server_start_time);
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    sprintf((char*) buff,
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	    "Uptime: %lu  Threads: %d  Questions: %lu  Slow queries: %lu  Opens: %lu  Flush tables: %lu  Open tables: %u  Queries per second avg: %.3f",
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	    uptime,
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	    (int) thread_count, (ulong) thd->query_id,
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	    current_global_status_var.long_query_count,
	    current_global_status_var.opened_tables, refresh_version, cached_tables(),
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	    (uptime ? (ulonglong2double(thd->query_id) / (double) uptime) :
	     (double) 0));
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#ifdef SAFEMALLOC
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    if (sf_malloc_cur_memory)				// Using SAFEMALLOC
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      sprintf(strend(buff), "  Memory in use: %ldK  Max memory used: %ldK",
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	      (sf_malloc_cur_memory+1023L)/1024L,
	      (sf_malloc_max_memory+1023L)/1024L);
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#endif
#ifndef EMBEDDED_LIBRARY
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    VOID(my_net_write(net, buff,(uint) strlen(buff)));
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    VOID(net_flush(net));
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#endif
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    break;
  }
  case COM_PING:
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    statistic_increment(thd->status_var.com_other, &LOCK_status);
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    send_ok(thd);				// Tell client we are alive
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    break;
  case COM_PROCESS_INFO:
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    statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_PROCESSLIST],
			&LOCK_status);
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    if (!thd->security_ctx->priv_user[0] &&
        check_global_access(thd, PROCESS_ACL))
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      break;
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    mysql_log.write(thd,command,NullS);
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    mysqld_list_processes(thd,
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			  thd->security_ctx->master_access & PROCESS_ACL ? 
			  NullS : thd->security_ctx->priv_user, 0);
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    break;
  case COM_PROCESS_KILL:
  {
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    statistic_increment(thd->status_var.com_stat[SQLCOM_KILL], &LOCK_status);
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    ulong id=(ulong) uint4korr(packet);
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    kill_one_thread(thd,id,false);
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    break;
  }
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  case COM_SET_OPTION:
  {
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    statistic_increment(thd->status_var.com_stat[SQLCOM_SET_OPTION],
			&LOCK_status);
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    uint opt_command= uint2korr(packet);

    switch (opt_command) {
    case (int) MYSQL_OPTION_MULTI_STATEMENTS_ON:
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      thd->client_capabilities|= CLIENT_MULTI_STATEMENTS;
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      send_eof(thd);
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      break;
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    case (int) MYSQL_OPTION_MULTI_STATEMENTS_OFF:
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      thd->client_capabilities&= ~CLIENT_MULTI_STATEMENTS;
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      send_eof(thd);
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      break;
    default:
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      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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      break;
    }
    break;
  }
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  case COM_DEBUG:
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    statistic_increment(thd->status_var.com_other, &LOCK_status);
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    if (check_global_access(thd, SUPER_ACL))
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      break;					/* purecov: inspected */
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    mysql_print_status();
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    mysql_log.write(thd,command,NullS);
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    send_eof(thd);
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    break;
  case COM_SLEEP:
  case COM_CONNECT:				// Impossible here
  case COM_TIME:				// Impossible from client
  case COM_DELAYED_INSERT:
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  case COM_END:
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  default:
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    my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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    break;
  }
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  if (thd->lock || thd->open_tables || thd->derived_tables ||
      thd->prelocked_mode)
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  {
    thd->proc_info="closing tables";
    close_thread_tables(thd);			/* Free tables */
  }
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  /*
    assume handlers auto-commit (if some doesn't - transaction handling
    in MySQL should be redesigned to support it; it's a big change,
    and it's not worth it - better to commit explicitly only writing
    transactions, read-only ones should better take care of themselves.
    saves some work in 2pc too)
    see also sql_base.cc - close_thread_tables()
  */
  bzero(&thd->transaction.stmt, sizeof(thd->transaction.stmt));
  if (!thd->active_transaction())
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    thd->transaction.xid_state.xid.null();
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  /* report error issued during command execution */
  if (thd->killed_errno() && !thd->net.report_error)
    thd->send_kill_message();
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  if (thd->net.report_error)
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    net_send_error(thd);
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2147
  log_slow_statement(thd);
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  thd->proc_info="cleaning up";
  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For process list
  thd->proc_info=0;
  thd->command=COM_SLEEP;
  thd->query=0;
  thd->query_length=0;
  thread_running--;
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
  thd->packet.shrink(thd->variables.net_buffer_length);	// Reclaim some memory
  free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));
  DBUG_RETURN(error);
}


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void log_slow_statement(THD *thd)
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{
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  time_t start_of_query;

  /*
    The following should never be true with our current code base,
    but better to keep this here so we don't accidently try to log a
    statement in a trigger or stored function
  */
  if (unlikely(thd->in_sub_stmt))
    return;                                     // Don't set time for sub stmt

  start_of_query= thd->start_time;
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  thd->end_time();				// Set start time
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  /*
    Do not log administrative statements unless the appropriate option is
    set; do not log into slow log if reading from backup.
  */
  if (thd->enable_slow_log && !thd->user_time)
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  {
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    thd->proc_info="logging slow query";

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    if ((ulong) (thd->start_time - thd->time_after_lock) >
	thd->variables.long_query_time ||
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        (thd->server_status &
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	  (SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED)) &&
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        (specialflag & SPECIAL_LOG_QUERIES_NOT_USING_INDEXES) &&
        /* == SQLCOM_END unless this is a SHOW command */
        thd->lex->orig_sql_command == SQLCOM_END)
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    {
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      thd->status_var.long_query_count++;
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      mysql_slow_log.write(thd, thd->query, thd->query_length, start_of_query);
    }
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  }
}

2200

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/*
  Create a TABLE_LIST object for an INFORMATION_SCHEMA table.

  SYNOPSIS
    prepare_schema_table()
      thd              thread handle
      lex              current lex
      table_ident      table alias if it's used
      schema_table_idx the type of the INFORMATION_SCHEMA table to be
                       created

  DESCRIPTION
    This function is used in the parser to convert a SHOW or DESCRIBE
    table_name command to a SELECT from INFORMATION_SCHEMA.
    It prepares a SELECT_LEX and a TABLE_LIST object to represent the
    given command as a SELECT parse tree.

  NOTES
    Due to the way this function works with memory and LEX it cannot
    be used outside the parser (parse tree transformations outside
    the parser break PS and SP).

  RETURN VALUE
    0                 success
    1                 out of memory or SHOW commands are not allowed
                      in this version of the server.
*/

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int prepare_schema_table(THD *thd, LEX *lex, Table_ident *table_ident,
                         enum enum_schema_tables schema_table_idx)
{
  DBUG_ENTER("prepare_schema_table");
  SELECT_LEX *sel= 0;
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  switch (schema_table_idx) {
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  case SCH_SCHEMATA:
#if defined(DONT_ALLOW_SHOW_COMMANDS)
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    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0));   /* purecov: inspected */
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    DBUG_RETURN(1);
#else
    if ((specialflag & SPECIAL_SKIP_SHOW_DB) &&
	check_global_access(thd, SHOW_DB_ACL))
      DBUG_RETURN(1);
    break;
#endif
  case SCH_TABLE_NAMES:
  case SCH_TABLES:
  case SCH_VIEWS:
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  case SCH_TRIGGERS:
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#ifdef DONT_ALLOW_SHOW_COMMANDS
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    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */
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    DBUG_RETURN(1);
#else
    {
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      char *db;
      if (lex->select_lex.db == NULL &&
          thd->copy_db_to(&lex->select_lex.db, 0))
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      {
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        DBUG_RETURN(1);
2261
      }
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      db= lex->select_lex.db;
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      remove_escape(db);				// Fix escaped '_'
      if (check_db_name(db))
      {
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        my_error(ER_WRONG_DB_NAME, MYF(0), db);
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        DBUG_RETURN(1);
      }
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      if (check_access(thd, SELECT_ACL, db, &thd->col_access, 0, 0,
                       is_schema_db(db)))
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        DBUG_RETURN(1);			        /* purecov: inspected */
      if (!thd->col_access && check_grant_db(thd,db))
      {
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	my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
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                 thd->security_ctx->priv_user, thd->security_ctx->priv_host,
                 db);
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	DBUG_RETURN(1);
      }
      break;
    }
#endif
  case SCH_COLUMNS:
  case SCH_STATISTICS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
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    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */
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    DBUG_RETURN(1);
#else
    if (table_ident)
    {
      TABLE_LIST **query_tables_last= lex->query_tables_last;
      sel= new SELECT_LEX();
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      /* 'parent_lex' is used in init_query() so it must be before it. */
      sel->parent_lex= lex;
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      sel->init_query();
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      if (!sel->add_table_to_list(thd, table_ident, 0, 0, TL_READ, 
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                                 (List<String> *) 0, (List<String> *) 0))
        DBUG_RETURN(1);
      lex->query_tables_last= query_tables_last;
      TABLE_LIST *table_list= (TABLE_LIST*) sel->table_list.first;
      char *db= table_list->db;
      remove_escape(db);			// Fix escaped '_'
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      remove_escape(table_list->table_name);
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      if (check_access(thd,SELECT_ACL | EXTRA_ACL,db,
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                       &table_list->grant.privilege, 0, 0,
                       test(table_list->schema_table)))
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        DBUG_RETURN(1);				/* purecov: inspected */
      if (grant_option && check_grant(thd, SELECT_ACL, table_list, 2,
                                      UINT_MAX, 0))
        DBUG_RETURN(1);
      break;
    }
#endif
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  case SCH_OPEN_TABLES:
  case SCH_VARIABLES:
  case SCH_STATUS:
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  case SCH_PROCEDURES:
  case SCH_CHARSETS:
  case SCH_COLLATIONS:
  case SCH_COLLATION_CHARACTER_SET_APPLICABILITY:
  case SCH_USER_PRIVILEGES:
  case SCH_SCHEMA_PRIVILEGES:
  case SCH_TABLE_PRIVILEGES:
  case SCH_COLUMN_PRIVILEGES:
  case SCH_TABLE_CONSTRAINTS:
  case SCH_KEY_COLUMN_USAGE:
  default:
    break;
  }
  
  SELECT_LEX *select_lex= lex->current_select;
  if (make_schema_select(thd, select_lex, schema_table_idx))
  {
    DBUG_RETURN(1);
  }
  TABLE_LIST *table_list= (TABLE_LIST*) select_lex->table_list.first;
  table_list->schema_select_lex= sel;
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  table_list->schema_table_reformed= 1;
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  statistic_increment(thd->status_var.com_stat[lex->orig_sql_command],
                      &LOCK_status);
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  DBUG_RETURN(0);
}


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/*
  Read query from packet and store in thd->query
2347
  Used in COM_QUERY and COM_STMT_PREPARE
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  DESCRIPTION
    Sets the following THD variables:
      query
      query_length

  RETURN VALUES
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    FALSE ok
    TRUE  error;  In this case thd->fatal_error is set
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*/

2359
bool alloc_query(THD *thd, const char *packet, uint packet_length)
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{
  packet_length--;				// Remove end null
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  /* Remove garbage at start and end of query */
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  while (my_isspace(thd->charset(),packet[0]) && packet_length > 0)
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  {
    packet++;
    packet_length--;
  }
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  const char *pos= packet + packet_length;     // Point at end null
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  while (packet_length > 0 &&
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	 (pos[-1] == ';' || my_isspace(thd->charset() ,pos[-1])))
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  {
    pos--;
    packet_length--;
  }
  /* We must allocate some extra memory for query cache */
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  thd->query_length= 0;                        // Extra safety: Avoid races
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  if (!(thd->query= (char*) thd->memdup_w_gap((gptr) (packet),
					      packet_length,
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					      thd->db_length+ 1 +
					      QUERY_CACHE_FLAGS_SIZE)))
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    return TRUE;
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  thd->query[packet_length]=0;
  thd->query_length= packet_length;
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  /* Reclaim some memory */
  thd->packet.shrink(thd->variables.net_buffer_length);
  thd->convert_buffer.shrink(thd->variables.net_buffer_length);
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  return FALSE;
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}

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static void reset_one_shot_variables(THD *thd) 
{
  thd->variables.character_set_client=
    global_system_variables.character_set_client;
  thd->variables.collation_connection=
    global_system_variables.collation_connection;
  thd->variables.collation_database=
    global_system_variables.collation_database;
  thd->variables.collation_server=
    global_system_variables.collation_server;
  thd->update_charset();
  thd->variables.time_zone=
    global_system_variables.time_zone;
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  thd->variables.lc_time_names= &my_locale_en_US;
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  thd->one_shot_set= 0;
}

2409

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/*
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  Execute command saved in thd and lex->sql_command
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  SYNOPSIS
    mysql_execute_command()
      thd                       Thread handle

  IMPLEMENTATION

    Before every operation that can request a write lock for a table
    wait if a global read lock exists. However do not wait if this
    thread has locked tables already. No new locks can be requested
    until the other locks are released. The thread that requests the
    global read lock waits for write locked tables to become unlocked.

    Note that wait_if_global_read_lock() sets a protection against a new
    global read lock when it succeeds. This needs to be released by
    start_waiting_global_read_lock() after the operation.

  RETURN
    FALSE       OK
    TRUE        Error
*/
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bool
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mysql_execute_command(THD *thd)
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{
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  bool res= FALSE;
  bool need_start_waiting= FALSE; // have protection against global read lock
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  int  up_result= 0;
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  LEX  *lex= thd->lex;
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  /* first SELECT_LEX (have special meaning for many of non-SELECTcommands) */
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  SELECT_LEX *select_lex= &lex->select_lex;
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  /* first table of first SELECT_LEX */
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  TABLE_LIST *first_table= (TABLE_LIST*) select_lex->table_list.first;
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  /* list of all tables in query */
  TABLE_LIST *all_tables;
  /* most outer SELECT_LEX_UNIT of query */
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  SELECT_LEX_UNIT *unit= &lex->unit;
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  /* Saved variable value */
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  DBUG_ENTER("mysql_execute_command");
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  thd->net.no_send_error= 0;
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  /*
    Remember first generated insert id value of the previous
    statement.  We remember it here at the beginning of the statement,
    and also in Item_func_last_insert_id::fix_fields() and
    sys_var_last_insert_id::value_ptr().  Last two places are required
    because LAST_INSERT_ID() and @@LAST_INSERT_ID may also be used in
    expression that is not executed with mysql_execute_command().

    And we remember it here because some statements read
    @@LAST_INSERT_ID indirectly, like "SELECT * FROM t1 WHERE id IS
    NULL", that may replace "id IS NULL" with "id = <LAST_INSERT_ID>".
  */
  thd->current_insert_id= thd->last_insert_id;

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VIEW  
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  /*
    In many cases first table of main SELECT_LEX have special meaning =>
    check that it is first table in global list and relink it first in 
    queries_tables list if it is necessary (we need such relinking only
    for queries with subqueries in select list, in this case tables of
    subqueries will go to global list first)

    all_tables will differ from first_table only if most upper SELECT_LEX
    do not contain tables.

    Because of above in place where should be at least one table in most
    outer SELECT_LEX we have following check:
    DBUG_ASSERT(first_table == all_tables);
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
  */
  lex->first_lists_tables_same();
2483
  /* should be assigned after making first tables same */
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VIEW  
unknown committed
2484
  all_tables= lex->query_tables;
2485 2486 2487 2488
  /* set context for commands which do not use setup_tables */
  select_lex->
    context.resolve_in_table_list_only((TABLE_LIST*)select_lex->
                                       table_list.first);
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VIEW  
unknown committed
2489

2490 2491 2492 2493 2494
  /*
    Reset warning count for each query that uses tables
    A better approach would be to reset this for any commands
    that is not a SHOW command or a select that only access local
    variables, but for now this is probably good enough.
2495
    Don't reset warnings when executing a stored routine.
2496
  */
2497
  if ((all_tables || &lex->select_lex != lex->all_selects_list ||
2498
       lex->sroutines.records) && !thd->spcont ||
2499
      lex->time_zone_tables_used)
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2500
    mysql_reset_errors(thd, 0);
2501

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SCRUM  
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2502
#ifdef HAVE_REPLICATION
2503
  if (unlikely(thd->slave_thread))
2504
  {
2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520 2521 2522 2523 2524 2525 2526 2527 2528
    if (lex->sql_command == SQLCOM_DROP_TRIGGER)
    {
      /*
        When dropping a trigger, we need to load its table name
        before checking slave filter rules.
      */
      add_table_for_trigger(thd, thd->lex->spname, 1, &all_tables);
      
      if (!all_tables)
      {
        /*
          If table name cannot be loaded,
          it means the trigger does not exists possibly because
          CREATE TRIGGER was previously skipped for this trigger
          according to slave filtering rules.
          Returning success without producing any errors in this case.
        */
        DBUG_RETURN(0);
      }
      
      // force searching in slave.cc:tables_ok() 
      all_tables->updating= 1;
    }
    
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2529
    /*
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2530 2531
      Check if statment should be skipped because of slave filtering
      rules
2532 2533

      Exceptions are:
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2534 2535
      - UPDATE MULTI: For this statement, we want to check the filtering
        rules later in the code
2536
      - SET: we always execute it (Not that many SET commands exists in
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2537 2538
        the binary log anyway -- only 4.1 masters write SET statements,
	in 5.0 there are no SET statements in the binary log)
2539 2540
      - DROP TEMPORARY TABLE IF EXISTS: we always execute it (otherwise we
        have stale files on slave caused by exclusion of one tmp table).
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merge  
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2541
    */
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2542 2543
    if (!(lex->sql_command == SQLCOM_UPDATE_MULTI) &&
	!(lex->sql_command == SQLCOM_SET_OPTION) &&
2544
	!(lex->sql_command == SQLCOM_DROP_TABLE &&
2545
          lex->drop_temporary && lex->drop_if_exists) &&
unknown's avatar
Merge  
unknown committed
2546
        all_tables_not_ok(thd, all_tables))
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2547 2548
    {
      /* we warn the slave SQL thread */
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2549
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566
      if (thd->one_shot_set)
      {
        /*
          It's ok to check thd->one_shot_set here:

          The charsets in a MySQL 5.0 slave can change by both a binlogged
          SET ONE_SHOT statement and the event-internal charset setting, 
          and these two ways to change charsets do not seems to work
          together.

          At least there seems to be problems in the rli cache for
          charsets if we are using ONE_SHOT.  Note that this is normally no
          problem because either the >= 5.0 slave reads a 4.1 binlog (with
          ONE_SHOT) *or* or 5.0 binlog (without ONE_SHOT) but never both."
        */
        reset_one_shot_variables(thd);
      }
2567
      DBUG_RETURN(0);
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2568
    }
2569
  }
2570
  else
2571
  {
2572
#endif /* HAVE_REPLICATION */
2573 2574 2575 2576 2577
    /*
      When option readonly is set deny operations which change non-temporary
      tables. Except for the replication thread and the 'super' users.
    */
    if (opt_readonly &&
2578 2579 2580 2581 2582 2583 2584
        !(thd->security_ctx->master_access & SUPER_ACL) &&
        uc_update_queries[lex->sql_command] &&
        !((lex->sql_command == SQLCOM_CREATE_TABLE) &&
          (lex->create_info.options & HA_LEX_CREATE_TMP_TABLE)) &&
        !((lex->sql_command == SQLCOM_DROP_TABLE) && lex->drop_temporary) &&
        ((lex->sql_command != SQLCOM_UPDATE_MULTI) &&
          some_non_temp_table_to_be_updated(thd, all_tables)))
2585 2586 2587 2588 2589 2590 2591
    {
      my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only");
      DBUG_RETURN(-1);
    }
#ifdef HAVE_REPLICATION
  } /* endif unlikely slave */
#endif
2592 2593 2594
  if(lex->orig_sql_command == SQLCOM_END)
    statistic_increment(thd->status_var.com_stat[lex->sql_command],
                        &LOCK_status);
2595

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2596 2597 2598
  switch (lex->sql_command) {
  case SQLCOM_SELECT:
  {
2599 2600 2601 2602
    /* assign global limit variable if limit is not given */
    {
      SELECT_LEX *param= lex->unit.global_parameters;
      if (!param->explicit_limit)
2603 2604
	param->select_limit=
          new Item_int((ulonglong)thd->variables.select_limit);
2605 2606
    }

2607
    select_result *sel_result=lex->result;
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VIEW  
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2608
    if (all_tables)
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2609
    {
2610 2611 2612 2613 2614 2615
      if (lex->orig_sql_command != SQLCOM_SHOW_STATUS_PROC &&
          lex->orig_sql_command != SQLCOM_SHOW_STATUS_FUNC)
        res= check_table_access(thd,
                                lex->exchange ? SELECT_ACL | FILE_ACL :
                                SELECT_ACL,
                                all_tables, 0);
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2616 2617
    }
    else
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VIEW  
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2618 2619
      res= check_access(thd,
			lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL,
2620
			any_db, 0, 0, 0, 0);
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2621
    if (res)
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2622
      goto error;
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2623

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VIEW  
unknown committed
2624
    if (!(res= open_and_lock_tables(thd, all_tables)))
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unknown committed
2625
    {
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2626
      if (lex->describe)
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unknown committed
2627
      {
2628 2629 2630 2631 2632 2633
        /*
          We always use select_send for EXPLAIN, even if it's an EXPLAIN
          for SELECT ... INTO OUTFILE: a user application should be able
          to prepend EXPLAIN to any query and receive output for it,
          even if the query itself redirects the output.
        */
2634
	if (!(sel_result= new select_send()))
2635
	  goto error;
2636
	else
2637 2638
	  thd->send_explain_fields(sel_result);
	res= mysql_explain_union(thd, &thd->lex->unit, sel_result);
unknown's avatar
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2639 2640 2641 2642 2643
	if (lex->describe & DESCRIBE_EXTENDED)
	{
	  char buff[1024];
	  String str(buff,(uint32) sizeof(buff), system_charset_info);
	  str.length(0);
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2644
	  thd->lex->unit.print(&str);
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2645 2646 2647 2648
	  str.append('\0');
	  push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
		       ER_YES, str.ptr());
	}
2649 2650
	sel_result->send_eof();
        delete sel_result;
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2651 2652 2653
      }
      else
      {
2654
	if (!sel_result && !(sel_result= new select_send()))
unknown's avatar
unknown committed
2655
          goto error;
unknown's avatar
VIEW  
unknown committed
2656
	query_cache_store_query(thd, all_tables);
2657 2658 2659
	res= handle_select(thd, lex, sel_result, 0);
        if (sel_result != lex->result)
          delete sel_result;
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unknown committed
2660
      }
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2661
    }
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2662 2663
    break;
  }
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2664
  case SQLCOM_PREPARE:
2665
  {
2666
    mysql_sql_stmt_prepare(thd);
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2667 2668 2669 2670
    break;
  }
  case SQLCOM_EXECUTE:
  {
2671
    mysql_sql_stmt_execute(thd);
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unknown committed
2672 2673 2674 2675
    break;
  }
  case SQLCOM_DEALLOCATE_PREPARE:
  {
2676
    mysql_sql_stmt_close(thd);
unknown's avatar
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2677 2678
    break;
  }
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2679
  case SQLCOM_DO:
2680 2681
    if (check_table_access(thd, SELECT_ACL, all_tables, 0) ||
        open_and_lock_tables(thd, all_tables))
unknown's avatar
unknown committed
2682
      goto error;
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unknown committed
2683 2684

    res= mysql_do(thd, *lex->insert_list);
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unknown committed
2685 2686
    break;

2687
  case SQLCOM_EMPTY_QUERY:
2688
    send_ok(thd);
2689 2690
    break;

unknown's avatar
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2691 2692 2693 2694
  case SQLCOM_HELP:
    res= mysqld_help(thd,lex->help_arg);
    break;

2695
#ifndef EMBEDDED_LIBRARY
unknown's avatar
unknown committed
2696
  case SQLCOM_PURGE:
2697
  {
unknown's avatar
unknown committed
2698
    if (check_global_access(thd, SUPER_ACL))
2699
      goto error;
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2700
    /* PURGE MASTER LOGS TO 'file' */
2701 2702 2703
    res = purge_master_logs(thd, lex->to_log);
    break;
  }
2704 2705
  case SQLCOM_PURGE_BEFORE:
  {
2706 2707
    Item *it;

2708 2709
    if (check_global_access(thd, SUPER_ACL))
      goto error;
unknown's avatar
unknown committed
2710
    /* PURGE MASTER LOGS BEFORE 'data' */
2711
    it= (Item *)lex->value_list.head();
2712
    if ((!it->fixed && it->fix_fields(lex->thd, &it)) ||
unknown's avatar
unknown committed
2713
        it->check_cols(1))
2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724
    {
      my_error(ER_WRONG_ARGUMENTS, MYF(0), "PURGE LOGS BEFORE");
      goto error;
    }
    it= new Item_func_unix_timestamp(it);
    /*
      it is OK only emulate fix_fieds, because we need only
      value of constant
    */
    it->quick_fix_field();
    res = purge_master_logs_before_date(thd, (ulong)it->val_int());
2725 2726
    break;
  }
2727
#endif
unknown's avatar
unknown committed
2728 2729
  case SQLCOM_SHOW_WARNS:
  {
2730 2731
    res= mysqld_show_warnings(thd, (ulong)
			      ((1L << (uint) MYSQL_ERROR::WARN_LEVEL_NOTE) |
2732 2733 2734
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_WARN) |
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR)
			       ));
unknown's avatar
unknown committed
2735 2736 2737 2738
    break;
  }
  case SQLCOM_SHOW_ERRORS:
  {
2739 2740
    res= mysqld_show_warnings(thd, (ulong)
			      (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR));
unknown's avatar
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2741 2742
    break;
  }
unknown's avatar
unknown committed
2743 2744
  case SQLCOM_SHOW_NEW_MASTER:
  {
unknown's avatar
unknown committed
2745
    if (check_global_access(thd, REPL_SLAVE_ACL))
unknown's avatar
unknown committed
2746
      goto error;
2747
    /* This query don't work now. See comment in repl_failsafe.cc */
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unknown committed
2748
#ifndef WORKING_NEW_MASTER
unknown's avatar
unknown committed
2749 2750
    my_error(ER_NOT_SUPPORTED_YET, MYF(0), "SHOW NEW MASTER");
    goto error;
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2751
#else
unknown's avatar
unknown committed
2752 2753
    res = show_new_master(thd);
    break;
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2754
#endif
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unknown committed
2755
  }
2756

unknown's avatar
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2757
#ifdef HAVE_REPLICATION
2758 2759
  case SQLCOM_SHOW_SLAVE_HOSTS:
  {
unknown's avatar
unknown committed
2760
    if (check_global_access(thd, REPL_SLAVE_ACL))
2761 2762 2763 2764
      goto error;
    res = show_slave_hosts(thd);
    break;
  }
unknown's avatar
unknown committed
2765 2766
  case SQLCOM_SHOW_BINLOG_EVENTS:
  {
unknown's avatar
unknown committed
2767
    if (check_global_access(thd, REPL_SLAVE_ACL))
unknown's avatar
unknown committed
2768
      goto error;
2769
    res = mysql_show_binlog_events(thd);
unknown's avatar
unknown committed
2770 2771
    break;
  }
2772 2773
#endif

unknown's avatar
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2774
  case SQLCOM_BACKUP_TABLE:
2775
  {
unknown's avatar
VIEW  
unknown committed
2776 2777 2778
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL, all_tables, 0) ||
unknown's avatar
unknown committed
2779
	check_global_access(thd, FILE_ACL))
2780
      goto error; /* purecov: inspected */
2781
    thd->enable_slow_log= opt_log_slow_admin_statements;
unknown's avatar
VIEW  
unknown committed
2782
    res = mysql_backup_table(thd, first_table);
2783
    select_lex->table_list.first= (byte*) first_table;
2784
    lex->query_tables=all_tables;
2785 2786
    break;
  }
unknown's avatar
unknown committed
2787
  case SQLCOM_RESTORE_TABLE:
2788
  {
unknown's avatar
VIEW  
unknown committed
2789 2790 2791
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, INSERT_ACL, all_tables, 0) ||
unknown's avatar
unknown committed
2792
	check_global_access(thd, FILE_ACL))
2793
      goto error; /* purecov: inspected */
2794
    thd->enable_slow_log= opt_log_slow_admin_statements;
unknown's avatar
VIEW  
unknown committed
2795
    res = mysql_restore_table(thd, first_table);
2796
    select_lex->table_list.first= (byte*) first_table;
2797
    lex->query_tables=all_tables;
2798 2799
    break;
  }
unknown's avatar
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2800 2801
  case SQLCOM_ASSIGN_TO_KEYCACHE:
  {
unknown's avatar
VIEW  
unknown committed
2802 2803 2804
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
        check_access(thd, INDEX_ACL, first_table->db,
2805 2806
                     &first_table->grant.privilege, 0, 0,
                     test(first_table->schema_table)))
unknown's avatar
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2807
      goto error;
2808
    res= mysql_assign_to_keycache(thd, first_table, &lex->ident);
unknown's avatar
unknown committed
2809 2810
    break;
  }
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2811 2812
  case SQLCOM_PRELOAD_KEYS:
  {
unknown's avatar
VIEW  
unknown committed
2813 2814 2815
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_access(thd, INDEX_ACL, first_table->db,
2816 2817
                     &first_table->grant.privilege, 0, 0,
                     test(first_table->schema_table)))
2818
      goto error;
unknown's avatar
VIEW  
unknown committed
2819
    res = mysql_preload_keys(thd, first_table);
unknown's avatar
unknown committed
2820 2821
    break;
  }
unknown's avatar
unknown committed
2822
#ifdef HAVE_REPLICATION
unknown's avatar
unknown committed
2823
  case SQLCOM_CHANGE_MASTER:
2824
  {
unknown's avatar
unknown committed
2825
    if (check_global_access(thd, SUPER_ACL))
2826
      goto error;
2827
    pthread_mutex_lock(&LOCK_active_mi);
2828
    res = change_master(thd,active_mi);
2829
    pthread_mutex_unlock(&LOCK_active_mi);
2830 2831
    break;
  }
unknown's avatar
unknown committed
2832
  case SQLCOM_SHOW_SLAVE_STAT:
2833
  {
2834 2835
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2836
      goto error;
2837
    pthread_mutex_lock(&LOCK_active_mi);
2838
    res = show_master_info(thd,active_mi);
2839
    pthread_mutex_unlock(&LOCK_active_mi);
2840 2841
    break;
  }
unknown's avatar
unknown committed
2842
  case SQLCOM_SHOW_MASTER_STAT:
2843
  {
2844 2845
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2846 2847 2848 2849
      goto error;
    res = show_binlog_info(thd);
    break;
  }
unknown's avatar
unknown committed
2850

2851
  case SQLCOM_LOAD_MASTER_DATA: // sync with master
unknown's avatar
unknown committed
2852
    if (check_global_access(thd, SUPER_ACL))
2853
      goto error;
2854
    if (end_active_trans(thd))
unknown's avatar
unknown committed
2855
      goto error;
2856 2857
    else
      res = load_master_data(thd);
2858
    break;
unknown's avatar
unknown committed
2859
#endif /* HAVE_REPLICATION */
2860 2861 2862 2863 2864 2865 2866
#ifdef HAVE_NDBCLUSTER_DB
  case SQLCOM_SHOW_NDBCLUSTER_STATUS:
    {
      res = ndbcluster_show_status(thd);
      break;
    }
#endif
unknown's avatar
unknown committed
2867 2868 2869
#ifdef HAVE_INNOBASE_DB
  case SQLCOM_SHOW_INNODB_STATUS:
    {
2870
      if (check_global_access(thd, SUPER_ACL))
unknown's avatar
unknown committed
2871 2872 2873 2874
	goto error;
      res = innodb_show_status(thd);
      break;
    }
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unknown committed
2875 2876 2877
  case SQLCOM_SHOW_MUTEX_STATUS:
    {
      if (check_global_access(thd, SUPER_ACL))
unknown's avatar
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2878
        goto error;
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unknown committed
2879 2880 2881
      res = innodb_mutex_show_status(thd);
      break;
    }
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2882
#endif
unknown's avatar
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2883
#ifdef HAVE_REPLICATION
unknown's avatar
unknown committed
2884
  case SQLCOM_LOAD_MASTER_TABLE:
2885
  {
unknown's avatar
VIEW  
unknown committed
2886
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
2887 2888
    DBUG_ASSERT(first_table->db); /* Must be set in the parser */

unknown's avatar
VIEW  
unknown committed
2889
    if (check_access(thd, CREATE_ACL, first_table->db,
2890 2891
		     &first_table->grant.privilege, 0, 0,
                     test(first_table->schema_table)))
unknown's avatar
unknown committed
2892 2893 2894 2895
      goto error;				/* purecov: inspected */
    if (grant_option)
    {
      /* Check that the first table has CREATE privilege */
unknown's avatar
VIEW  
unknown committed
2896
      if (check_grant(thd, CREATE_ACL, all_tables, 0, 1, 0))
2897
	goto error;
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unknown committed
2898
    }
2899
    if (strlen(first_table->table_name) > NAME_LEN)
unknown's avatar
unknown committed
2900
    {
2901
      my_error(ER_WRONG_TABLE_NAME, MYF(0), first_table->table_name);
unknown's avatar
unknown committed
2902 2903
      break;
    }
2904
    pthread_mutex_lock(&LOCK_active_mi);
2905 2906 2907 2908
    /*
      fetch_master_table will send the error to the client on failure.
      Give error if the table already exists.
    */
2909
    if (!fetch_master_table(thd, first_table->db, first_table->table_name,
2910
			    active_mi, 0, 0))
2911
    {
2912
      send_ok(thd);
2913
    }
2914
    pthread_mutex_unlock(&LOCK_active_mi);
unknown's avatar
unknown committed
2915
    break;
2916
  }
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2917
#endif /* HAVE_REPLICATION */
2918

unknown's avatar
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2919
  case SQLCOM_CREATE_TABLE:
unknown's avatar
unknown committed
2920
  {
2921
    /* If CREATE TABLE of non-temporary table, do implicit commit */
2922 2923 2924 2925 2926 2927 2928 2929 2930 2931
    if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE))
    {
      if (end_active_trans(thd))
      {
	res= -1;
	break;
      }
    }
    else 
    {
unknown's avatar
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2932 2933
      /* So that CREATE TEMPORARY TABLE gets to binlog at commit/rollback */
      thd->options|= OPTION_STATUS_NO_TRANS_UPDATE;
2934
    }
unknown's avatar
VIEW  
unknown committed
2935 2936 2937 2938 2939
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    bool link_to_local;
    // Skip first table, which is the table we are creating
    TABLE_LIST *create_table= lex->unlink_first_table(&link_to_local);
    TABLE_LIST *select_tables= lex->query_tables;
unknown's avatar
unknown committed
2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953
    /*
      Code below (especially in mysql_create_table() and select_create
      methods) may modify HA_CREATE_INFO structure in LEX, so we have to
      use a copy of this structure to make execution prepared statement-
      safe. A shallow copy is enough as this code won't modify any memory
      referenced from this structure.
    */
    HA_CREATE_INFO create_info(lex->create_info);
    Alter_info alter_info(lex->alter_info, thd->mem_root);

    if (thd->is_fatal_error)
    {
      /* out of memory when creating a copy of alter_info */
      res= 1;
2954
      goto end_with_restore_list;
unknown's avatar
unknown committed
2955
    }
unknown's avatar
unknown committed
2956

unknown's avatar
VIEW  
unknown committed
2957
    if ((res= create_table_precheck(thd, select_tables, create_table)))
unknown's avatar
unknown committed
2958
      goto end_with_restore_list;
unknown's avatar
unknown committed
2959

2960
    create_info.alias= create_table->alias;
2961

2962
#ifndef HAVE_READLINK
2963
    if (create_info.data_file_name)
2964 2965
      push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
                   "DATA DIRECTORY option ignored");
2966
    if (create_info.index_file_name)
2967 2968
      push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
                   "INDEX DIRECTORY option ignored");
unknown's avatar
unknown committed
2969
    create_info.data_file_name= create_info.index_file_name= NULL;
2970
#else
2971
    /* Fix names if symlinked tables */
unknown's avatar
unknown committed
2972
    if (append_file_to_dir(thd, &create_info.data_file_name,
2973
			   create_table->table_name) ||
unknown's avatar
unknown committed
2974
	append_file_to_dir(thd, &create_info.index_file_name,
2975
			   create_table->table_name))
unknown's avatar
unknown committed
2976
      goto end_with_restore_list;
2977
#endif
2978
    /*
2979
      If we are using SET CHARSET without DEFAULT, add an implicit
2980 2981
      DEFAULT to not confuse old users. (This may change).
    */
unknown's avatar
unknown committed
2982
    if ((create_info.used_fields &
2983 2984 2985
	 (HA_CREATE_USED_DEFAULT_CHARSET | HA_CREATE_USED_CHARSET)) ==
	HA_CREATE_USED_CHARSET)
    {
unknown's avatar
unknown committed
2986 2987 2988 2989
      create_info.used_fields&= ~HA_CREATE_USED_CHARSET;
      create_info.used_fields|= HA_CREATE_USED_DEFAULT_CHARSET;
      create_info.default_table_charset= create_info.table_charset;
      create_info.table_charset= 0;
2990
    }
2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003
    /*
      The create-select command will open and read-lock the select table
      and then create, open and write-lock the new table. If a global
      read lock steps in, we get a deadlock. The write lock waits for
      the global read lock, while the global read lock waits for the
      select table to be closed. So we wait until the global readlock is
      gone before starting both steps. Note that
      wait_if_global_read_lock() sets a protection against a new global
      read lock when it succeeds. This needs to be released by
      start_waiting_global_read_lock(). We protect the normal CREATE
      TABLE in the same way. That way we avoid that a new table is
      created during a gobal read lock.
    */
3004 3005
    if (!thd->locked_tables &&
        !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
3006
    {
unknown's avatar
unknown committed
3007 3008
      res= 1;
      goto end_with_restore_list;
3009
    }
3010
    if (select_lex->item_list.elements)		// With select
unknown's avatar
unknown committed
3011
    {
3012
      select_result *sel_result;
3013

3014
      select_lex->options|= SELECT_NO_UNLOCK;
3015
      unit->set_limit(select_lex);
3016

unknown's avatar
VIEW  
unknown committed
3017
      if (!(res= open_and_lock_tables(thd, select_tables)))
3018
      {
3019 3020 3021 3022
        /*
          Is table which we are changing used somewhere in other parts
          of query
        */
3023
        if (!(create_info.options & HA_LEX_CREATE_TMP_TABLE))
3024
        {
3025
          TABLE_LIST *duplicate;
3026
          if ((duplicate= unique_table(thd, create_table, select_tables)))
3027 3028 3029
          {
            update_non_unique_table_error(create_table, "CREATE", duplicate);
            res= 1;
3030
            goto end_with_restore_list;
3031
          }
3032
        }
unknown's avatar
unknown committed
3033
        /* If we create merge table, we have to test tables in merge, too */
3034
        if (create_info.used_fields & HA_CREATE_USED_UNION)
unknown's avatar
unknown committed
3035 3036
        {
          TABLE_LIST *tab;
3037
          for (tab= (TABLE_LIST*) create_info.merge_list.first;
unknown's avatar
unknown committed
3038 3039 3040
               tab;
               tab= tab->next_local)
          {
3041
            TABLE_LIST *duplicate;
3042
            if ((duplicate= unique_table(thd, tab, select_tables)))
unknown's avatar
unknown committed
3043
            {
3044
              update_non_unique_table_error(tab, "CREATE", duplicate);
unknown's avatar
unknown committed
3045
              res= 1;
3046
              goto end_with_restore_list;
unknown's avatar
unknown committed
3047 3048 3049
            }
          }
        }
unknown's avatar
unknown committed
3050 3051 3052 3053
        /*
          select_create is currently not re-execution friendly and
          needs to be created for every execution of a PS/SP.
        */
3054
        if ((sel_result= new select_create(create_table,
3055 3056
                                           &create_info,
                                           &alter_info,
3057 3058 3059
                                           select_lex->item_list,
                                           lex->duplicates,
                                           lex->ignore)))
3060 3061 3062 3063 3064
        {
          /*
            CREATE from SELECT give its SELECT_LEX for SELECT,
            and item_list belong to SELECT
          */
3065 3066
          res= handle_select(thd, lex, sel_result, 0);
          delete sel_result;
3067
        }
3068 3069
      }
    }
unknown's avatar
unknown committed
3070
    else
unknown's avatar
unknown committed
3071
    {
unknown's avatar
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3072
      /* regular create */
unknown's avatar
unknown committed
3073
      if (lex->name)
unknown's avatar
unknown committed
3074
        res= mysql_create_like_table(thd, create_table, &create_info,
3075
                                     (Table_ident *)lex->name);
unknown's avatar
unknown committed
3076
      else
3077
      {
unknown's avatar
VIEW  
unknown committed
3078
        res= mysql_create_table(thd, create_table->db,
3079
                                create_table->table_name, &create_info,
unknown's avatar
unknown committed
3080
                                &alter_info, 0, 0);
3081
      }
unknown's avatar
unknown committed
3082
      if (!res)
3083
	send_ok(thd);
unknown's avatar
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3084
    }
3085

unknown's avatar
unknown committed
3086
    /* put tables back for PS rexecuting */
unknown's avatar
unknown committed
3087
end_with_restore_list:
unknown's avatar
VIEW  
unknown committed
3088
    lex->link_first_table_back(create_table, link_to_local);
unknown's avatar
unknown committed
3089
    break;
unknown's avatar
unknown committed
3090
  }
unknown's avatar
unknown committed
3091
  case SQLCOM_CREATE_INDEX:
unknown's avatar
unknown committed
3092 3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105 3106 3107 3108 3109 3110 3111 3112
    /* Fall through */
  case SQLCOM_DROP_INDEX:
  /*
    CREATE INDEX and DROP INDEX are implemented by calling ALTER
    TABLE with proper arguments. This isn't very fast but it
    should work for most cases.

    In the future ALTER TABLE will notice that only added
    indexes and create these one by one for the existing table
    without having to do a full rebuild.

    One should normally create all indexes with CREATE TABLE or
    ALTER TABLE.
  */
  {
    Alter_info alter_info(lex->alter_info, thd->mem_root);
    HA_CREATE_INFO create_info;

    if (thd->is_fatal_error) /* out of memory creating a copy of alter_info*/
      goto error;

unknown's avatar
VIEW  
unknown committed
3113
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3114
    if (check_one_table_access(thd, INDEX_ACL, first_table))
unknown's avatar
unknown committed
3115
      goto error; /* purecov: inspected */
3116
    if (end_active_trans(thd))
unknown's avatar
unknown committed
3117
      goto error;
unknown's avatar
unknown committed
3118 3119 3120 3121 3122 3123
    /*
      Currently CREATE INDEX or DROP INDEX cause a full table rebuild
      and thus classify as slow administrative statements just like
      ALTER TABLE.
    */
    thd->enable_slow_log= opt_log_slow_admin_statements;
unknown's avatar
unknown committed
3124

unknown's avatar
unknown committed
3125 3126
    bzero((char*) &create_info, sizeof(create_info));
    create_info.db_type= DB_TYPE_DEFAULT;
unknown's avatar
unknown committed
3127
    create_info.row_type= ROW_TYPE_NOT_USED;
unknown's avatar
unknown committed
3128
    create_info.default_table_charset= thd->variables.collation_database;
unknown's avatar
unknown committed
3129

3130
    res= mysql_alter_table(thd, first_table->db, first_table->table_name,
3131
                           &create_info, first_table, &alter_info,
3132
                           0, (ORDER*) 0, 0);
unknown's avatar
unknown committed
3133 3134
    break;
  }
unknown's avatar
unknown committed
3135
#ifdef HAVE_REPLICATION
unknown's avatar
unknown committed
3136
  case SQLCOM_SLAVE_START:
3137
  {
3138
    pthread_mutex_lock(&LOCK_active_mi);
3139
    start_slave(thd,active_mi,1 /* net report*/);
3140
    pthread_mutex_unlock(&LOCK_active_mi);
unknown's avatar
unknown committed
3141
    break;
3142
  }
unknown's avatar
unknown committed
3143
  case SQLCOM_SLAVE_STOP:
3144 3145 3146 3147 3148 3149
  /*
    If the client thread has locked tables, a deadlock is possible.
    Assume that
    - the client thread does LOCK TABLE t READ.
    - then the master updates t.
    - then the SQL slave thread wants to update t,
3150
      so it waits for the client thread because t is locked by it.
3151
    - then the client thread does SLAVE STOP.
3152 3153
      SLAVE STOP waits for the SQL slave thread to terminate its
      update t, which waits for the client thread because t is locked by it.
3154 3155 3156
    To prevent that, refuse SLAVE STOP if the
    client thread has locked tables
  */
3157
  if (thd->locked_tables || thd->active_transaction() || thd->global_read_lock)
3158
  {
3159 3160
    my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
               ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3161
    goto error;
3162
  }
3163
  {
3164
    pthread_mutex_lock(&LOCK_active_mi);
3165
    stop_slave(thd,active_mi,1/* net report*/);
3166
    pthread_mutex_unlock(&LOCK_active_mi);
unknown's avatar
unknown committed
3167
    break;
3168
  }
unknown's avatar
unknown committed
3169
#endif /* HAVE_REPLICATION */
3170

unknown's avatar
unknown committed
3171
  case SQLCOM_ALTER_TABLE:
unknown's avatar
VIEW  
unknown committed
3172
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
3173
    {
unknown's avatar
unknown committed
3174
      ulong priv=0;
unknown's avatar
unknown committed
3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185
      /*
        Code in mysql_alter_table() may modify its HA_CREATE_INFO argument,
        so we have to use a copy of this structure to make execution
        prepared statement- safe. A shallow copy is enough as no memory
        referenced from this structure will be modified.
      */
      HA_CREATE_INFO create_info(lex->create_info);
      Alter_info alter_info(lex->alter_info, thd->mem_root);

      if (thd->is_fatal_error) /* out of memory creating a copy of alter_info */
        goto error;
unknown's avatar
unknown committed
3186
      if (lex->name && (!lex->name[0] || strlen(lex->name) > NAME_LEN))
unknown's avatar
unknown committed
3187
      {
3188
	my_error(ER_WRONG_TABLE_NAME, MYF(0), lex->name);
unknown's avatar
unknown committed
3189
        goto error;
unknown's avatar
unknown committed
3190
      }
unknown's avatar
unknown committed
3191 3192
      /* Must be set in the parser */
      DBUG_ASSERT(select_lex->db);
unknown's avatar
VIEW  
unknown committed
3193
      if (check_access(thd, ALTER_ACL, first_table->db,
3194 3195 3196 3197
		       &first_table->grant.privilege, 0, 0,
                       test(first_table->schema_table)) ||
	  check_access(thd,INSERT_ACL | CREATE_ACL,select_lex->db,&priv,0,0,
                       is_schema_db(select_lex->db))||
unknown's avatar
VIEW  
unknown committed
3198
	  check_merge_table_access(thd, first_table->db,
3199
				   (TABLE_LIST *)
unknown's avatar
unknown committed
3200
				   create_info.merge_list.first))
3201
	goto error;				/* purecov: inspected */
unknown's avatar
unknown committed
3202 3203
      if (grant_option)
      {
unknown's avatar
VIEW  
unknown committed
3204
	if (check_grant(thd, ALTER_ACL, all_tables, 0, UINT_MAX, 0))
unknown's avatar
unknown committed
3205 3206 3207 3208 3209
	  goto error;
	if (lex->name && !test_all_bits(priv,INSERT_ACL | CREATE_ACL))
	{					// Rename of table
	  TABLE_LIST tmp_table;
	  bzero((char*) &tmp_table,sizeof(tmp_table));
3210
	  tmp_table.table_name=lex->name;
3211
	  tmp_table.db=select_lex->db;
unknown's avatar
unknown committed
3212
	  tmp_table.grant.privilege=priv;
unknown's avatar
unknown committed
3213 3214
	  if (check_grant(thd, INSERT_ACL | CREATE_ACL, &tmp_table, 0,
			  UINT_MAX, 0))
unknown's avatar
unknown committed
3215 3216 3217
	    goto error;
	}
      }
3218
      /* Don't yet allow changing of symlinks with ALTER TABLE */
unknown's avatar
unknown committed
3219
      if (create_info.data_file_name)
3220 3221
        push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
                     "DATA DIRECTORY option ignored");
unknown's avatar
unknown committed
3222
      if (create_info.index_file_name)
3223 3224
        push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
                     "INDEX DIRECTORY option ignored");
unknown's avatar
unknown committed
3225
      create_info.data_file_name= create_info.index_file_name= NULL;
unknown's avatar
unknown committed
3226
      /* ALTER TABLE ends previous transaction */
3227
      if (end_active_trans(thd))
unknown's avatar
unknown committed
3228
	goto error;
unknown's avatar
unknown committed
3229
      else
unknown's avatar
unknown committed
3230
      {
3231 3232 3233 3234 3235 3236 3237
        if (!thd->locked_tables &&
            !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
        {
          res= 1;
          break;
        }

3238
        thd->enable_slow_log= opt_log_slow_admin_statements;
unknown's avatar
unknown committed
3239 3240
        res= mysql_alter_table(thd, select_lex->db, lex->name,
                               &create_info,
3241
                               first_table,
unknown's avatar
unknown committed
3242 3243
                               &alter_info,
                               select_lex->order_list.elements,
3244
                               (ORDER *) select_lex->order_list.first,
3245
                               lex->ignore);
unknown's avatar
unknown committed
3246
      }
unknown's avatar
unknown committed
3247 3248
      break;
    }
unknown's avatar
unknown committed
3249
  case SQLCOM_RENAME_TABLE:
unknown's avatar
unknown committed
3250
  {
unknown's avatar
VIEW  
unknown committed
3251
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
3252
    TABLE_LIST *table;
unknown's avatar
VIEW  
unknown committed
3253
    if (check_db_used(thd, all_tables))
unknown's avatar
unknown committed
3254
      goto error;
unknown's avatar
VIEW  
unknown committed
3255
    for (table= first_table; table; table= table->next_local->next_local)
unknown's avatar
unknown committed
3256
    {
unknown's avatar
unknown committed
3257
      if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
3258
		       &table->grant.privilege,0,0, test(table->schema_table)) ||
unknown's avatar
VIEW  
unknown committed
3259
	  check_access(thd, INSERT_ACL | CREATE_ACL, table->next_local->db,
3260 3261
		       &table->next_local->grant.privilege, 0, 0,
                       test(table->next_local->schema_table)))
unknown's avatar
unknown committed
3262 3263 3264
	goto error;
      if (grant_option)
      {
unknown's avatar
VIEW  
unknown committed
3265
	TABLE_LIST old_list, new_list;
unknown's avatar
unknown committed
3266 3267 3268 3269
	/*
	  we do not need initialize old_list and new_list because we will
	  come table[0] and table->next[0] there
	*/
unknown's avatar
VIEW  
unknown committed
3270 3271 3272 3273
	old_list= table[0];
	new_list= table->next_local[0];
	if (check_grant(thd, ALTER_ACL, &old_list, 0, 1, 0) ||
	    (!test_all_bits(table->next_local->grant.privilege,
3274
			    INSERT_ACL | CREATE_ACL) &&
unknown's avatar
VIEW  
unknown committed
3275
	     check_grant(thd, INSERT_ACL | CREATE_ACL, &new_list, 0, 1, 0)))
unknown's avatar
unknown committed
3276 3277 3278
	  goto error;
      }
    }
unknown's avatar
VIEW  
unknown committed
3279
    query_cache_invalidate3(thd, first_table, 0);
unknown's avatar
unknown committed
3280 3281
    if (end_active_trans(thd) || mysql_rename_tables(thd, first_table))
      goto error;
unknown's avatar
unknown committed
3282
    break;
unknown's avatar
unknown committed
3283
  }
3284
#ifndef EMBEDDED_LIBRARY
unknown's avatar
unknown committed
3285 3286
  case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
unknown's avatar
unknown committed
3287 3288
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
3289
    goto error;
unknown's avatar
unknown committed
3290 3291
#else
    {
unknown's avatar
unknown committed
3292
      if (check_global_access(thd, SUPER_ACL))
unknown's avatar
unknown committed
3293 3294 3295 3296
	goto error;
      res = show_binlogs(thd);
      break;
    }
unknown's avatar
unknown committed
3297
#endif
3298
#endif /* EMBEDDED_LIBRARY */
unknown's avatar
unknown committed
3299
  case SQLCOM_SHOW_CREATE:
unknown's avatar
VIEW  
unknown committed
3300
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
3301
#ifdef DONT_ALLOW_SHOW_COMMANDS
unknown's avatar
unknown committed
3302 3303
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
3304
    goto error;
unknown's avatar
unknown committed
3305
#else
unknown's avatar
unknown committed
3306
    {
3307 3308 3309 3310
      /* Ignore temporary tables if this is "SHOW CREATE VIEW" */
      if (lex->only_view)
        first_table->skip_temporary= 1;

unknown's avatar
VIEW  
unknown committed
3311 3312
      if (check_db_used(thd, all_tables) ||
	  check_access(thd, SELECT_ACL | EXTRA_ACL, first_table->db,
3313 3314
		       &first_table->grant.privilege, 0, 0, 
                       test(first_table->schema_table)))
unknown's avatar
unknown committed
3315
	goto error;
unknown's avatar
unknown committed
3316
      if (grant_option && check_grant(thd, SELECT_ACL, all_tables, 2, UINT_MAX, 0))
3317
	goto error;
unknown's avatar
unknown committed
3318
      res= mysqld_show_create(thd, first_table);
unknown's avatar
unknown committed
3319 3320
      break;
    }
unknown's avatar
unknown committed
3321
#endif
3322 3323
  case SQLCOM_CHECKSUM:
  {
unknown's avatar
VIEW  
unknown committed
3324 3325 3326
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL | EXTRA_ACL, all_tables, 0))
3327
      goto error; /* purecov: inspected */
unknown's avatar
VIEW  
unknown committed
3328
    res = mysql_checksum_table(thd, first_table, &lex->check_opt);
3329 3330
    break;
  }
unknown's avatar
unknown committed
3331
  case SQLCOM_REPAIR:
3332
  {
unknown's avatar
VIEW  
unknown committed
3333 3334 3335
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
3336
      goto error; /* purecov: inspected */
3337
    thd->enable_slow_log= opt_log_slow_admin_statements;
unknown's avatar
VIEW  
unknown committed
3338
    res= mysql_repair_table(thd, first_table, &lex->check_opt);
3339 3340 3341
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
3342
      /* Presumably, REPAIR and binlog writing doesn't require synchronization */
3343 3344
      if (mysql_bin_log.is_open())
      {
unknown's avatar
unknown committed
3345
	thd->clear_error(); // No binlog error generated
3346
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3347 3348 3349
        mysql_bin_log.write(&qinfo);
      }
    }
3350
    select_lex->table_list.first= (byte*) first_table;
3351
    lex->query_tables=all_tables;
3352 3353
    break;
  }
unknown's avatar
unknown committed
3354
  case SQLCOM_CHECK:
3355
  {
unknown's avatar
VIEW  
unknown committed
3356 3357 3358
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL | EXTRA_ACL , all_tables, 0))
3359
      goto error; /* purecov: inspected */
3360
    thd->enable_slow_log= opt_log_slow_admin_statements;
unknown's avatar
VIEW  
unknown committed
3361
    res = mysql_check_table(thd, first_table, &lex->check_opt);
3362
    select_lex->table_list.first= (byte*) first_table;
3363
    lex->query_tables=all_tables;
3364 3365
    break;
  }
unknown's avatar
unknown committed
3366 3367
  case SQLCOM_ANALYZE:
  {
unknown's avatar
VIEW  
unknown committed
3368 3369 3370
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
unknown's avatar
unknown committed
3371
      goto error; /* purecov: inspected */
3372
    thd->enable_slow_log= opt_log_slow_admin_statements;
unknown's avatar
VIEW  
unknown committed
3373
    res = mysql_analyze_table(thd, first_table, &lex->check_opt);
3374 3375 3376
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
3377
      /* Presumably, ANALYZE and binlog writing doesn't require synchronization */
3378 3379
      if (mysql_bin_log.is_open())
      {
unknown's avatar
unknown committed
3380
	thd->clear_error(); // No binlog error generated
3381
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3382 3383 3384
        mysql_bin_log.write(&qinfo);
      }
    }
3385
    select_lex->table_list.first= (byte*) first_table;
3386
    lex->query_tables=all_tables;
unknown's avatar
unknown committed
3387
    break;
unknown's avatar
unknown committed
3388
  }
3389

unknown's avatar
unknown committed
3390 3391
  case SQLCOM_OPTIMIZE:
  {
unknown's avatar
VIEW  
unknown committed
3392 3393 3394
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
unknown's avatar
unknown committed
3395
      goto error; /* purecov: inspected */
3396
    thd->enable_slow_log= opt_log_slow_admin_statements;
3397
    res= (specialflag & (SPECIAL_SAFE_MODE | SPECIAL_NO_NEW_FUNC)) ?
3398
      mysql_recreate_table(thd, first_table) :
unknown's avatar
VIEW  
unknown committed
3399
      mysql_optimize_table(thd, first_table, &lex->check_opt);
3400 3401 3402
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
3403
      /* Presumably, OPTIMIZE and binlog writing doesn't require synchronization */
3404 3405
      if (mysql_bin_log.is_open())
      {
unknown's avatar
unknown committed
3406
	thd->clear_error(); // No binlog error generated
3407
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3408 3409 3410
        mysql_bin_log.write(&qinfo);
      }
    }
3411
    select_lex->table_list.first= (byte*) first_table;
3412
    lex->query_tables=all_tables;
unknown's avatar
unknown committed
3413 3414 3415
    break;
  }
  case SQLCOM_UPDATE:
unknown's avatar
VIEW  
unknown committed
3416 3417
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (update_precheck(thd, all_tables))
unknown's avatar
unknown committed
3418
      break;
3419 3420
    DBUG_ASSERT(select_lex->offset_limit == 0);
    unit->set_limit(select_lex);
3421 3422 3423 3424 3425 3426 3427 3428
    res= (up_result= mysql_update(thd, all_tables,
                                  select_lex->item_list,
                                  lex->value_list,
                                  select_lex->where,
                                  select_lex->order_list.elements,
                                  (ORDER *) select_lex->order_list.first,
                                  unit->select_limit_cnt,
                                  lex->duplicates, lex->ignore));
3429
    /* mysql_update return 2 if we need to switch to multi-update */
3430
    if (up_result != 2)
3431
      break;
3432
    /* Fall through */
3433
  case SQLCOM_UPDATE_MULTI:
unknown's avatar
unknown committed
3434 3435 3436
  {
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    /* if we switched from normal update, rights are checked */
3437
    if (up_result != 2)
3438
    {
unknown's avatar
unknown committed
3439 3440 3441 3442 3443
      if ((res= multi_update_precheck(thd, all_tables)))
        break;
    }
    else
      res= 0;
unknown's avatar
unknown committed
3444

3445
    res= mysql_multi_update_prepare(thd);
unknown's avatar
unknown committed
3446

3447
#ifdef HAVE_REPLICATION
unknown's avatar
unknown committed
3448
    /* Check slave filtering rules */
3449
    if (unlikely(thd->slave_thread))
unknown's avatar
unknown committed
3450
    {
3451 3452
      if (all_tables_not_ok(thd, all_tables))
      {
3453 3454 3455 3456 3457
        if (res!= 0)
        {
          res= 0;             /* don't care of prev failure  */
          thd->clear_error(); /* filters are of highest prior */
        }
3458 3459 3460 3461
        /* we warn the slave SQL thread */
        my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
        break;
      }
3462 3463
      if (res)
        break;
unknown's avatar
unknown committed
3464
    }
3465 3466
    else
    {
3467 3468 3469 3470 3471 3472 3473 3474 3475 3476 3477 3478 3479
#endif /* HAVE_REPLICATION */
      if (res)
        break;
      if (opt_readonly &&
	  !(thd->security_ctx->master_access & SUPER_ACL) &&
	  some_non_temp_table_to_be_updated(thd, all_tables))
      {
	my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only");
	break;
      }
#ifdef HAVE_REPLICATION
    }  /* unlikely */
#endif
unknown's avatar
unknown committed
3480

unknown's avatar
unknown committed
3481 3482 3483 3484 3485 3486
    res= mysql_multi_update(thd, all_tables,
                            &select_lex->item_list,
                            &lex->value_list,
                            select_lex->where,
                            select_lex->options,
                            lex->duplicates, lex->ignore, unit, select_lex);
unknown's avatar
unknown committed
3487
    break;
unknown's avatar
unknown committed
3488
  }
unknown's avatar
unknown committed
3489
  case SQLCOM_REPLACE:
3490 3491
  case SQLCOM_INSERT:
  {
unknown's avatar
VIEW  
unknown committed
3492
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
3493
    if ((res= insert_precheck(thd, all_tables)))
unknown's avatar
unknown committed
3494
      break;
3495 3496 3497 3498 3499 3500 3501 3502

    if (!thd->locked_tables &&
        !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
    {
      res= 1;
      break;
    }

unknown's avatar
VIEW  
unknown committed
3503
    res= mysql_insert(thd, all_tables, lex->field_list, lex->many_values,
unknown's avatar
unknown committed
3504
		      lex->update_list, lex->value_list,
3505
                      lex->duplicates, lex->ignore);
3506 3507 3508 3509 3510 3511 3512

    /*
      If we have inserted into a VIEW, and the base table has
      AUTO_INCREMENT column, but this column is not accessible through
      a view, then we should restore LAST_INSERT_ID to the value it
      had before the statement.
    */
unknown's avatar
VIEW  
unknown committed
3513
    if (first_table->view && !first_table->contain_auto_increment)
3514 3515
      thd->last_insert_id= thd->current_insert_id;

unknown's avatar
unknown committed
3516
    break;
3517
  }
unknown's avatar
unknown committed
3518 3519 3520
  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
  {
3521
    select_result *sel_result;
unknown's avatar
VIEW  
unknown committed
3522
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
3523
    if ((res= insert_precheck(thd, all_tables)))
3524
      break;
unknown's avatar
unknown committed
3525

3526
    /* Fix lock for first table */
unknown's avatar
VIEW  
unknown committed
3527 3528
    if (first_table->lock_type == TL_WRITE_DELAYED)
      first_table->lock_type= TL_WRITE;
3529

3530 3531
    /* Don't unlock tables until command is written to binary log */
    select_lex->options|= SELECT_NO_UNLOCK;
unknown's avatar
unknown committed
3532

3533
    unit->set_limit(select_lex);
3534 3535 3536 3537 3538 3539 3540 3541

    if (! thd->locked_tables &&
        ! (need_start_waiting= ! wait_if_global_read_lock(thd, 0, 1)))
    {
      res= 1;
      break;
    }

unknown's avatar
VIEW  
unknown committed
3542
    if (!(res= open_and_lock_tables(thd, all_tables)))
3543
    {
3544
      /* Skip first table, which is the table we are inserting in */
unknown's avatar
unknown committed
3545 3546
      TABLE_LIST *second_table= first_table->next_local;
      select_lex->table_list.first= (byte*) second_table;
3547 3548
      select_lex->context.table_list= 
        select_lex->context.first_name_resolution_table= second_table;
3549
      res= mysql_insert_select_prepare(thd);
3550 3551 3552 3553 3554 3555 3556
      if (!res && (sel_result= new select_insert(first_table,
                                                 first_table->table,
                                                 &lex->field_list,
                                                 &lex->update_list,
                                                 &lex->value_list,
                                                 lex->duplicates,
                                                 lex->ignore)))
3557
      {
3558
	res= handle_select(thd, lex, sel_result, OPTION_SETUP_TABLES_DONE);
3559 3560 3561 3562 3563 3564 3565 3566 3567
        /*
          Invalidate the table in the query cache if something changed
          after unlocking when changes become visible.
          TODO: this is workaround. right way will be move invalidating in
          the unlock procedure.
        */
        if (first_table->lock_type ==  TL_WRITE_CONCURRENT_INSERT &&
            thd->lock)
        {
3568 3569 3570
          /* INSERT ... SELECT should invalidate only the very first table */
          TABLE_LIST *save_table= first_table->next_local;
          first_table->next_local= 0;
3571 3572
          mysql_unlock_tables(thd, thd->lock);
          query_cache_invalidate3(thd, first_table, 1);
3573
          first_table->next_local= save_table;
3574 3575
          thd->lock=0;
        }
3576
        delete sel_result;
3577
      }
3578
      /* revert changes for SP */
unknown's avatar
unknown committed
3579
      select_lex->table_list.first= (byte*) first_table;
3580
    }
unknown's avatar
VIEW  
unknown committed
3581

3582 3583 3584 3585 3586 3587
    /*
      If we have inserted into a VIEW, and the base table has
      AUTO_INCREMENT column, but this column is not accessible through
      a view, then we should restore LAST_INSERT_ID to the value it
      had before the statement.
    */
unknown's avatar
VIEW  
unknown committed
3588
    if (first_table->view && !first_table->contain_auto_increment)
3589 3590
      thd->last_insert_id= thd->current_insert_id;

unknown's avatar
unknown committed
3591 3592
    break;
  }
3593
  case SQLCOM_TRUNCATE:
3594 3595 3596 3597 3598
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
unknown's avatar
VIEW  
unknown committed
3599 3600
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_one_table_access(thd, DELETE_ACL, all_tables))
unknown's avatar
unknown committed
3601
      goto error;
3602 3603 3604 3605
    /*
      Don't allow this within a transaction because we want to use
      re-generate table
    */
3606
    if (thd->locked_tables || thd->active_transaction())
3607
    {
unknown's avatar
unknown committed
3608 3609
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3610 3611
      goto error;
    }
unknown's avatar
VIEW  
unknown committed
3612

unknown's avatar
unknown committed
3613
    res= mysql_truncate(thd, first_table, 0);
3614
    break;
unknown's avatar
unknown committed
3615
  case SQLCOM_DELETE:
unknown's avatar
unknown committed
3616
  {
unknown's avatar
VIEW  
unknown committed
3617 3618
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if ((res= delete_precheck(thd, all_tables)))
unknown's avatar
unknown committed
3619
      break;
3620 3621
    DBUG_ASSERT(select_lex->offset_limit == 0);
    unit->set_limit(select_lex);
3622 3623 3624 3625 3626 3627 3628 3629

    if (!thd->locked_tables &&
        !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
    {
      res= 1;
      break;
    }

unknown's avatar
VIEW  
unknown committed
3630
    res = mysql_delete(thd, all_tables, select_lex->where,
3631
                       &select_lex->order_list,
unknown's avatar
unknown committed
3632 3633
                       unit->select_limit_cnt, select_lex->options,
                       FALSE);
unknown's avatar
unknown committed
3634 3635
    break;
  }
3636
  case SQLCOM_DELETE_MULTI:
unknown's avatar
unknown committed
3637
  {
unknown's avatar
VIEW  
unknown committed
3638
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3639
    TABLE_LIST *aux_tables=
unknown's avatar
unknown committed
3640
      (TABLE_LIST *)thd->lex->auxiliary_table_list.first;
3641
    multi_delete *del_result;
unknown's avatar
unknown committed
3642

3643 3644 3645 3646 3647 3648 3649
    if (!thd->locked_tables &&
        !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
    {
      res= 1;
      break;
    }

3650
    if ((res= multi_delete_precheck(thd, all_tables)))
3651
      break;
unknown's avatar
unknown committed
3652

unknown's avatar
unknown committed
3653
    /* condition will be TRUE on SP re-excuting */
3654 3655
    if (select_lex->item_list.elements != 0)
      select_lex->item_list.empty();
unknown's avatar
unknown committed
3656
    if (add_item_to_list(thd, new Item_null()))
unknown's avatar
unknown committed
3657
      goto error;
3658

unknown's avatar
unknown committed
3659
    thd->proc_info="init";
unknown's avatar
VIEW  
unknown committed
3660 3661 3662 3663
    if ((res= open_and_lock_tables(thd, all_tables)))
      break;

    if ((res= mysql_multi_delete_prepare(thd)))
unknown's avatar
unknown committed
3664
      goto error;
3665

3666 3667
    if (!thd->is_fatal_error &&
        (del_result= new multi_delete(aux_tables, lex->table_count)))
unknown's avatar
unknown committed
3668
    {
3669 3670 3671
      res= mysql_select(thd, &select_lex->ref_pointer_array,
			select_lex->get_table_list(),
			select_lex->with_wild,
3672
			select_lex->item_list,
unknown's avatar
unknown committed
3673
			select_lex->where,
3674
			0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
unknown's avatar
unknown committed
3675 3676
			(ORDER *)NULL,
			select_lex->options | thd->options |
3677 3678
			SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK |
                        OPTION_SETUP_TABLES_DONE,
3679 3680
			del_result, unit, select_lex);
      delete del_result;
unknown's avatar
unknown committed
3681 3682
    }
    else
3683
      res= TRUE;                                // Error
unknown's avatar
unknown committed
3684 3685
    break;
  }
unknown's avatar
unknown committed
3686
  case SQLCOM_DROP_TABLE:
unknown's avatar
unknown committed
3687
  {
unknown's avatar
VIEW  
unknown committed
3688
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3689 3690
    if (!lex->drop_temporary)
    {
unknown's avatar
VIEW  
unknown committed
3691
      if (check_table_access(thd, DROP_ACL, all_tables, 0))
3692 3693
	goto error;				/* purecov: inspected */
      if (end_active_trans(thd))
unknown's avatar
unknown committed
3694
        goto error;
3695
    }
unknown's avatar
unknown committed
3696
    else
unknown's avatar
unknown committed
3697 3698 3699 3700 3701 3702
    {
      /*
	If this is a slave thread, we may sometimes execute some 
	DROP / * 40005 TEMPORARY * / TABLE
	that come from parts of binlogs (likely if we use RESET SLAVE or CHANGE
	MASTER TO), while the temporary table has already been dropped.
unknown's avatar
unknown committed
3703 3704
	To not generate such irrelevant "table does not exist errors",
	we silently add IF EXISTS if TEMPORARY was used.
unknown's avatar
unknown committed
3705 3706 3707
      */
      if (thd->slave_thread)
	lex->drop_if_exists= 1;
3708

unknown's avatar
unknown committed
3709 3710
      /* So that DROP TEMPORARY TABLE gets to binlog at commit/rollback */
      thd->options|= OPTION_STATUS_NO_TRANS_UPDATE;
unknown's avatar
unknown committed
3711
    }
3712
    /* DDL and binlog write order protected by LOCK_open */
unknown's avatar
VIEW  
unknown committed
3713 3714
    res= mysql_rm_table(thd, first_table, lex->drop_if_exists,
			lex->drop_temporary);
unknown's avatar
unknown committed
3715 3716
  }
  break;
unknown's avatar
unknown committed
3717
  case SQLCOM_SHOW_PROCESSLIST:
3718 3719
    if (!thd->security_ctx->priv_user[0] &&
        check_global_access(thd,PROCESS_ACL))
unknown's avatar
unknown committed
3720
      break;
unknown's avatar
unknown committed
3721
    mysqld_list_processes(thd,
3722 3723 3724 3725
			  (thd->security_ctx->master_access & PROCESS_ACL ?
                           NullS :
                           thd->security_ctx->priv_user),
                          lex->verbose);
unknown's avatar
unknown committed
3726
    break;
unknown's avatar
unknown committed
3727 3728
  case SQLCOM_SHOW_STORAGE_ENGINES:
    res= mysqld_show_storage_engines(thd);
unknown's avatar
unknown committed
3729 3730 3731 3732 3733 3734 3735
    break;
  case SQLCOM_SHOW_PRIVILEGES:
    res= mysqld_show_privileges(thd);
    break;
  case SQLCOM_SHOW_COLUMN_TYPES:
    res= mysqld_show_column_types(thd);
    break;
unknown's avatar
unknown committed
3736 3737
  case SQLCOM_SHOW_LOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
unknown's avatar
unknown committed
3738 3739
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0));	/* purecov: inspected */
3740
    goto error;
unknown's avatar
unknown committed
3741 3742
#else
    {
3743
      if (grant_option && check_access(thd, FILE_ACL, any_db,0,0,0,0))
unknown's avatar
unknown committed
3744 3745 3746 3747
	goto error;
      res= mysqld_show_logs(thd);
      break;
    }
unknown's avatar
unknown committed
3748 3749
#endif
  case SQLCOM_CHANGE_DB:
3750 3751
    if (!mysql_change_db(thd,select_lex->db,FALSE))
      send_ok(thd);
unknown's avatar
unknown committed
3752
    break;
3753

unknown's avatar
unknown committed
3754 3755
  case SQLCOM_LOAD:
  {
unknown's avatar
VIEW  
unknown committed
3756
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
3757
    uint privilege= (lex->duplicates == DUP_REPLACE ?
unknown's avatar
unknown committed
3758 3759
		     INSERT_ACL | DELETE_ACL : INSERT_ACL) |
                    (lex->local_file ? 0 : FILE_ACL);
3760

unknown's avatar
unknown committed
3761
    if (lex->local_file)
unknown's avatar
unknown committed
3762
    {
3763
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
3764
          !opt_local_infile)
3765
      {
unknown's avatar
unknown committed
3766
	my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND), MYF(0));
3767 3768
	goto error;
      }
unknown's avatar
unknown committed
3769
    }
unknown's avatar
unknown committed
3770 3771 3772 3773

    if (check_one_table_access(thd, privilege, all_tables))
      goto error;

unknown's avatar
VIEW  
unknown committed
3774
    res= mysql_load(thd, lex->exchange, first_table, lex->field_list,
unknown's avatar
unknown committed
3775
                    lex->update_list, lex->value_list, lex->duplicates,
3776
                    lex->ignore, (bool) lex->local_file);
unknown's avatar
unknown committed
3777 3778
    break;
  }
3779

unknown's avatar
unknown committed
3780
  case SQLCOM_SET_OPTION:
3781 3782
  {
    List<set_var_base> *lex_var_list= &lex->var_list;
3783
    if ((check_table_access(thd, SELECT_ACL, all_tables, 0) ||
unknown's avatar
unknown committed
3784 3785
	 open_and_lock_tables(thd, all_tables)))
      goto error;
3786 3787
    if (lex->one_shot_set && not_all_support_one_shot(lex_var_list))
    {
unknown's avatar
unknown committed
3788 3789
      my_error(ER_RESERVED_SYNTAX, MYF(0), "SET ONE_SHOT");
      goto error;
3790 3791 3792 3793 3794 3795 3796 3797
    }
    if (!(res= sql_set_variables(thd, lex_var_list)))
    {
      /*
        If the previous command was a SET ONE_SHOT, we don't want to forget
        about the ONE_SHOT property of that SET. So we use a |= instead of = .
      */
      thd->one_shot_set|= lex->one_shot_set;
3798
      send_ok(thd);
3799
    }
unknown's avatar
unknown committed
3800
    break;
3801
  }
unknown's avatar
unknown committed
3802

unknown's avatar
unknown committed
3803
  case SQLCOM_UNLOCK_TABLES:
3804 3805 3806 3807 3808 3809
    /*
      It is critical for mysqldump --single-transaction --master-data that
      UNLOCK TABLES does not implicitely commit a connection which has only
      done FLUSH TABLES WITH READ LOCK + BEGIN. If this assumption becomes
      false, mysqldump will not work.
    */
unknown's avatar
unknown committed
3810
    unlock_locked_tables(thd);
unknown's avatar
unknown committed
3811 3812
    if (thd->options & OPTION_TABLE_LOCK)
    {
unknown's avatar
unknown committed
3813
      end_active_trans(thd);
unknown's avatar
unknown committed
3814
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
unknown's avatar
unknown committed
3815 3816
    }
    if (thd->global_read_lock)
3817
      unlock_global_read_lock(thd);
3818
    send_ok(thd);
unknown's avatar
unknown committed
3819 3820
    break;
  case SQLCOM_LOCK_TABLES:
unknown's avatar
unknown committed
3821
    unlock_locked_tables(thd);
unknown's avatar
VIEW  
unknown committed
3822
    if (check_db_used(thd, all_tables) || end_active_trans(thd))
unknown's avatar
unknown committed
3823
      goto error;
unknown's avatar
VIEW  
unknown committed
3824
    if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, all_tables, 0))
3825
      goto error;
unknown's avatar
unknown committed
3826
    thd->in_lock_tables=1;
unknown's avatar
unknown committed
3827
    thd->options|= OPTION_TABLE_LOCK;
unknown's avatar
VIEW  
unknown committed
3828

3829
    if (!(res= simple_open_n_lock_tables(thd, all_tables)))
unknown's avatar
unknown committed
3830
    {
3831 3832
#ifdef HAVE_QUERY_CACHE
      if (thd->variables.query_cache_wlock_invalidate)
unknown's avatar
VIEW  
unknown committed
3833
	query_cache.invalidate_locked_for_write(first_table);
3834
#endif /*HAVE_QUERY_CACHE*/
unknown's avatar
unknown committed
3835 3836
      thd->locked_tables=thd->lock;
      thd->lock=0;
3837
      send_ok(thd);
unknown's avatar
unknown committed
3838
    }
unknown's avatar
unknown committed
3839 3840
    else
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
unknown's avatar
unknown committed
3841 3842 3843
    thd->in_lock_tables=0;
    break;
  case SQLCOM_CREATE_DB:
3844
  {
unknown's avatar
unknown committed
3845 3846 3847 3848 3849 3850
    /*
      As mysql_create_db() may modify HA_CREATE_INFO structure passed to
      it, we need to use a copy of LEX::create_info to make execution
      prepared statement- safe.
    */
    HA_CREATE_INFO create_info(lex->create_info);
3851 3852 3853 3854 3855
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
unknown's avatar
unknown committed
3856
    char *alias;
unknown's avatar
unknown committed
3857
    if (!(alias=thd->strdup(lex->name)) || check_db_name(lex->name))
unknown's avatar
unknown committed
3858
    {
3859
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
unknown's avatar
unknown committed
3860 3861
      break;
    }
3862 3863 3864
    /*
      If in a slave thread :
      CREATE DATABASE DB was certainly not preceded by USE DB.
3865
      For that reason, db_ok() in sql/slave.cc did not check the
3866 3867 3868
      do_db/ignore_db. And as this query involves no tables, tables_ok()
      above was not called. So we have to check rules again here.
    */
3869
#ifdef HAVE_REPLICATION
3870
    if (thd->slave_thread &&
3871 3872
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
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3873
    {
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3874
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
3875
      break;
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3876
    }
3877
#endif
3878

3879
    if (check_access(thd,CREATE_ACL,lex->name,0,1,0,is_schema_db(lex->name)))
3880
      break;
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3881
    res= mysql_create_db(thd,(lower_case_table_names == 2 ? alias : lex->name),
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3882
			 &create_info, 0);
3883 3884
    break;
  }
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3885
  case SQLCOM_DROP_DB:
3886
  {
3887 3888 3889 3890 3891
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
3892
    if (check_db_name(lex->name))
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3893
    {
3894
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
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3895 3896
      break;
    }
3897 3898 3899 3900 3901 3902 3903
    /*
      If in a slave thread :
      DROP DATABASE DB may not be preceded by USE DB.
      For that reason, maybe db_ok() in sql/slave.cc did not check the 
      do_db/ignore_db. And as this query involves no tables, tables_ok()
      above was not called. So we have to check rules again here.
    */
3904
#ifdef HAVE_REPLICATION
3905 3906 3907
    if (thd->slave_thread && 
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
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3908
    {
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3909
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
3910
      break;
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3911
    }
3912
#endif
3913
    if (check_access(thd,DROP_ACL,lex->name,0,1,0,is_schema_db(lex->name)))
3914
      break;
3915 3916
    if (thd->locked_tables || thd->active_transaction())
    {
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unknown committed
3917 3918
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3919 3920
      goto error;
    }
3921
    res= mysql_rm_db(thd, lex->name, lex->drop_if_exists, 0);
3922 3923
    break;
  }
3924 3925
  case SQLCOM_ALTER_DB:
  {
unknown's avatar
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3926 3927
    char *db= lex->name;
    DBUG_ASSERT(db); /* Must be set in the parser */
3928
    if (!strip_sp(db) || check_db_name(db))
3929
    {
3930
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
3931 3932
      break;
    }
unknown's avatar
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3933 3934 3935
    /*
      If in a slave thread :
      ALTER DATABASE DB may not be preceded by USE DB.
3936
      For that reason, maybe db_ok() in sql/slave.cc did not check the
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3937 3938 3939 3940
      do_db/ignore_db. And as this query involves no tables, tables_ok()
      above was not called. So we have to check rules again here.
    */
#ifdef HAVE_REPLICATION
3941
    if (thd->slave_thread &&
3942 3943
	(!db_ok(db, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(db)))
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3944
    {
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3945
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
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3946 3947 3948
      break;
    }
#endif
3949
    if (check_access(thd, ALTER_ACL, db, 0, 1, 0, is_schema_db(db)))
3950 3951 3952
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
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3953 3954
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3955 3956
      goto error;
    }
3957
    res= mysql_alter_db(thd, db, &lex->create_info);
3958 3959
    break;
  }
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3960 3961 3962 3963
  case SQLCOM_SHOW_CREATE_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
3964
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
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3965 3966
      break;
    }
3967
    if (check_access(thd,SELECT_ACL,lex->name,0,1,0,is_schema_db(lex->name)))
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3968
      break;
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3969
    res=mysqld_show_create_db(thd,lex->name,&lex->create_info);
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3970 3971
    break;
  }
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3972
  case SQLCOM_CREATE_FUNCTION:                  // UDF function
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3973
  {
3974
    if (check_access(thd,INSERT_ACL,"mysql",0,1,0,0))
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3975
      break;
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3976
#ifdef HAVE_DLOPEN
3977 3978
    if (sp_find_routine(thd, TYPE_ENUM_FUNCTION, lex->spname,
                        &thd->sp_func_cache, FALSE))
unknown's avatar
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3979
    {
3980
      my_error(ER_UDF_EXISTS, MYF(0), lex->spname->m_name.str);
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3981 3982
      goto error;
    }
3983
    if (!(res = mysql_create_function(thd, &lex->udf)))
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3984
      send_ok(thd);
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3985
#else
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3986
    my_error(ER_CANT_OPEN_LIBRARY, MYF(0), lex->udf.dl, 0, "feature disabled");
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3987
    res= TRUE;
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3988 3989
#endif
    break;
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3990
  }
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3991
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3992 3993
  case SQLCOM_CREATE_USER:
  {
3994
    if (check_access(thd, INSERT_ACL, "mysql", 0, 1, 1, 0) &&
3995
        check_global_access(thd,CREATE_USER_ACL))
3996
      break;
3997 3998
    if (end_active_trans(thd))
      goto error;
3999
    /* Conditionally writes to binlog */
4000 4001 4002 4003
    if (!(res= mysql_create_user(thd, lex->users_list)))
      send_ok(thd);
    break;
  }
4004 4005
  case SQLCOM_DROP_USER:
  {
4006
    if (check_access(thd, DELETE_ACL, "mysql", 0, 1, 1, 0) &&
4007
        check_global_access(thd,CREATE_USER_ACL))
4008
      break;
4009 4010
    if (end_active_trans(thd))
      goto error;
4011
    /* Conditionally writes to binlog */
4012
    if (!(res= mysql_drop_user(thd, lex->users_list)))
4013 4014 4015 4016 4017
      send_ok(thd);
    break;
  }
  case SQLCOM_RENAME_USER:
  {
4018
    if (check_access(thd, UPDATE_ACL, "mysql", 0, 1, 1, 0) &&
4019
        check_global_access(thd,CREATE_USER_ACL))
4020
      break;
4021 4022
    if (end_active_trans(thd))
      goto error;
4023
    /* Conditionally writes to binlog */
4024
    if (!(res= mysql_rename_user(thd, lex->users_list)))
4025 4026 4027 4028 4029
      send_ok(thd);
    break;
  }
  case SQLCOM_REVOKE_ALL:
  {
4030
    if (check_access(thd, UPDATE_ACL, "mysql", 0, 1, 1, 0) &&
4031
        check_global_access(thd,CREATE_USER_ACL))
4032
      break;
4033
    /* Conditionally writes to binlog */
4034 4035 4036 4037
    if (!(res = mysql_revoke_all(thd, lex->users_list)))
      send_ok(thd);
    break;
  }
4038 4039 4040 4041
  case SQLCOM_REVOKE:
  case SQLCOM_GRANT:
  {
    if (check_access(thd, lex->grant | lex->grant_tot_col | GRANT_ACL,
unknown's avatar
unknown committed
4042
		     first_table ?  first_table->db : select_lex->db,
unknown's avatar
VIEW  
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4043
		     first_table ? &first_table->grant.privilege : 0,
4044 4045 4046
		     first_table ? 0 : 1, 0,
                     first_table ? (bool) first_table->schema_table :
                     select_lex->db ? is_schema_db(select_lex->db) : 0))
4047 4048
      goto error;

4049
    if (thd->security_ctx->user)              // If not replication
unknown's avatar
unknown committed
4050
    {
4051
      LEX_USER *user, *tmp_user;
4052

unknown's avatar
unknown committed
4053
      List_iterator <LEX_USER> user_list(lex->users_list);
4054
      while ((tmp_user= user_list++))
unknown's avatar
unknown committed
4055
      {
4056 4057
        if (!(user= get_current_user(thd, tmp_user)))
          goto error;
4058 4059 4060 4061 4062 4063 4064 4065
        if (specialflag & SPECIAL_NO_RESOLVE &&
            hostname_requires_resolving(user->host.str))
          push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                              ER_WARN_HOSTNAME_WONT_WORK,
                              ER(ER_WARN_HOSTNAME_WONT_WORK),
                              user->host.str);
        // Are we trying to change a password of another user
        DBUG_ASSERT(user->host.str != 0);
4066
        if (strcmp(thd->security_ctx->user, user->user.str) ||
4067
            my_strcasecmp(system_charset_info,
4068
                          user->host.str, thd->security_ctx->host_or_ip))
4069 4070
        {
          // TODO: use check_change_password()
4071 4072
          if (is_acl_user(user->host.str, user->user.str) &&
              user->password.str &&
4073
              check_access(thd, UPDATE_ACL,"mysql",0,1,1,0))
4074 4075 4076 4077 4078 4079
          {
            my_message(ER_PASSWORD_NOT_ALLOWED,
                       ER(ER_PASSWORD_NOT_ALLOWED), MYF(0));
            goto error;
          }
        }
unknown's avatar
SCRUM  
unknown committed
4080 4081
      }
    }
unknown's avatar
VIEW  
unknown committed
4082
    if (first_table)
4083
    {
4084 4085
      if (lex->type == TYPE_ENUM_PROCEDURE ||
          lex->type == TYPE_ENUM_FUNCTION)
4086 4087 4088 4089 4090
      {
        uint grants= lex->all_privileges 
		   ? (PROC_ACLS & ~GRANT_ACL) | (lex->grant & GRANT_ACL)
		   : lex->grant;
        if (grant_option && 
4091 4092
	    check_grant_routine(thd, grants | GRANT_ACL, all_tables,
                                lex->type == TYPE_ENUM_PROCEDURE, 0))
4093
	  goto error;
4094
        /* Conditionally writes to binlog */
4095 4096 4097 4098
        res= mysql_routine_grant(thd, all_tables,
                                 lex->type == TYPE_ENUM_PROCEDURE, 
                                 lex->users_list, grants,
                                 lex->sql_command == SQLCOM_REVOKE, 0);
4099 4100 4101 4102 4103 4104 4105 4106
      }
      else
      {
	if (grant_option && check_grant(thd,
					(lex->grant | lex->grant_tot_col |
					 GRANT_ACL),
					all_tables, 0, UINT_MAX, 0))
	  goto error;
4107
        /* Conditionally writes to binlog */
4108 4109 4110 4111
        res= mysql_table_grant(thd, all_tables, lex->users_list,
			       lex->columns, lex->grant,
			       lex->sql_command == SQLCOM_REVOKE);
      }
4112 4113 4114
    }
    else
    {
4115
      if (lex->columns.elements || lex->type)
4116
      {
unknown's avatar
unknown committed
4117 4118
	my_message(ER_ILLEGAL_GRANT_FOR_TABLE, ER(ER_ILLEGAL_GRANT_FOR_TABLE),
                   MYF(0));
unknown's avatar
unknown committed
4119
        goto error;
4120 4121
      }
      else
4122
	/* Conditionally writes to binlog */
4123 4124 4125 4126
	res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
			  lex->sql_command == SQLCOM_REVOKE);
      if (!res)
      {
4127
	if (lex->sql_command == SQLCOM_GRANT)
4128
	{
unknown's avatar
unknown committed
4129
	  List_iterator <LEX_USER> str_list(lex->users_list);
4130 4131 4132 4133 4134
	  LEX_USER *user, *tmp_user;
	  while ((tmp_user=str_list++))
          {
            if (!(user= get_current_user(thd, tmp_user)))
              goto error;
unknown's avatar
unknown committed
4135
	    reset_mqh(user);
4136
          }
4137
	}
4138 4139 4140 4141
      }
    }
    break;
  }
unknown's avatar
SCRUM  
unknown committed
4142
#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/
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4143
  case SQLCOM_RESET:
4144 4145 4146
    /*
      RESET commands are never written to the binary log, so we have to
      initialize this variable because RESET shares the same code as FLUSH
4147 4148 4149 4150
    */
    lex->no_write_to_binlog= 1;
  case SQLCOM_FLUSH:
  {
unknown's avatar
unknown committed
4151
    bool write_to_binlog;
4152
    if (check_global_access(thd,RELOAD_ACL))
unknown's avatar
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4153
      goto error;
4154

4155 4156 4157 4158
    /*
      reload_acl_and_cache() will tell us if we are allowed to write to the
      binlog or not.
    */
unknown's avatar
unknown committed
4159
    if (!reload_acl_and_cache(thd, lex->type, first_table, &write_to_binlog))
4160 4161 4162 4163 4164
    {
      /*
        We WANT to write and we CAN write.
        ! we write after unlocking the table.
      */
4165
      /* Presumably, RESET and binlog writing doesn't require synchronization */
4166 4167 4168 4169
      if (!lex->no_write_to_binlog && write_to_binlog)
      {
        if (mysql_bin_log.is_open())
        {
4170
          Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
4171 4172 4173 4174
          mysql_bin_log.write(&qinfo);
        }
      }
      send_ok(thd);
4175 4176
    } 
    
unknown's avatar
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4177
    break;
4178
  }
unknown's avatar
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4179
  case SQLCOM_KILL:
4180 4181 4182
  {
    Item *it= (Item *)lex->value_list.head();

4183
    if ((!it->fixed && it->fix_fields(lex->thd, &it)) || it->check_cols(1))
4184 4185 4186 4187 4188 4189
    {
      my_message(ER_SET_CONSTANTS_ONLY, ER(ER_SET_CONSTANTS_ONLY),
		 MYF(0));
      goto error;
    }
    kill_one_thread(thd, (ulong)it->val_int(), lex->type & ONLY_KILL_QUERY);
unknown's avatar
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4190
    break;
4191
  }
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4192
#ifndef NO_EMBEDDED_ACCESS_CHECKS
unknown's avatar
unknown committed
4193
  case SQLCOM_SHOW_GRANTS:
4194 4195 4196 4197
  {
    LEX_USER *grant_user= get_current_user(thd, lex->grant_user);
    if (!grant_user)
      goto error;
4198
    if ((thd->security_ctx->priv_user &&
4199
	 !strcmp(thd->security_ctx->priv_user, grant_user->user.str)) ||
4200
	!check_access(thd, SELECT_ACL, "mysql",0,1,0,0))
unknown's avatar
unknown committed
4201
    {
4202
      res = mysql_show_grants(thd, grant_user);
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unknown committed
4203 4204
    }
    break;
4205
  }
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4206
#endif
4207
  case SQLCOM_HA_OPEN:
unknown's avatar
VIEW  
unknown committed
4208 4209 4210
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL, all_tables, 0))
4211
      goto error;
unknown's avatar
unknown committed
4212
    res= mysql_ha_open(thd, first_table, 0);
4213 4214
    break;
  case SQLCOM_HA_CLOSE:
unknown's avatar
VIEW  
unknown committed
4215 4216
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables))
4217
      goto error;
unknown's avatar
VIEW  
unknown committed
4218
    res= mysql_ha_close(thd, first_table);
4219 4220
    break;
  case SQLCOM_HA_READ:
unknown's avatar
VIEW  
unknown committed
4221
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
4222 4223 4224 4225 4226
    /*
      There is no need to check for table permissions here, because
      if a user has no permissions to read a table, he won't be
      able to open it (with SQLCOM_HA_OPEN) in the first place.
    */
unknown's avatar
VIEW  
unknown committed
4227
    if (check_db_used(thd, all_tables))
4228
      goto error;
4229
    unit->set_limit(select_lex);
4230
    res= mysql_ha_read(thd, first_table, lex->ha_read_mode, lex->ident.str,
unknown's avatar
VIEW  
unknown committed
4231
                       lex->insert_list, lex->ha_rkey_mode, select_lex->where,
4232
                       unit->select_limit_cnt, unit->offset_limit_cnt);
4233 4234
    break;

unknown's avatar
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4235
  case SQLCOM_BEGIN:
4236 4237 4238 4239 4240 4241
    if (thd->transaction.xid_state.xa_state != XA_NOTR)
    {
      my_error(ER_XAER_RMFAIL, MYF(0),
               xa_state_names[thd->transaction.xid_state.xa_state]);
      break;
    }
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4242
    if (begin_trans(thd))
unknown's avatar
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4243
      goto error;
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4244
    send_ok(thd);
unknown's avatar
unknown committed
4245 4246
    break;
  case SQLCOM_COMMIT:
4247
    if (end_trans(thd, lex->tx_release ? COMMIT_RELEASE :
unknown's avatar
unknown committed
4248
                              lex->tx_chain ? COMMIT_AND_CHAIN : COMMIT))
unknown's avatar
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4249
      goto error;
4250
    send_ok(thd);
unknown's avatar
unknown committed
4251 4252
    break;
  case SQLCOM_ROLLBACK:
4253
    if (end_trans(thd, lex->tx_release ? ROLLBACK_RELEASE :
unknown's avatar
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4254
                              lex->tx_chain ? ROLLBACK_AND_CHAIN : ROLLBACK))
unknown's avatar
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4255
      goto error;
4256
    send_ok(thd);
unknown's avatar
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4257
    break;
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4258
  case SQLCOM_RELEASE_SAVEPOINT:
unknown's avatar
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4259
  {
4260 4261
    SAVEPOINT *sv;
    for (sv=thd->transaction.savepoints; sv; sv=sv->prev)
unknown's avatar
unknown committed
4262 4263 4264
    {
      if (my_strnncoll(system_charset_info,
                       (uchar *)lex->ident.str, lex->ident.length,
4265
                       (uchar *)sv->name, sv->length) == 0)
unknown's avatar
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4266 4267
        break;
    }
4268
    if (sv)
unknown's avatar
unknown committed
4269
    {
4270
      if (ha_release_savepoint(thd, sv))
unknown's avatar
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4271
        res= TRUE; // cannot happen
unknown's avatar
unknown committed
4272 4273
      else
        send_ok(thd);
4274
      thd->transaction.savepoints=sv->prev;
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4275
    }
4276
    else
unknown's avatar
unknown committed
4277
      my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str);
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4278
    break;
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4279
  }
unknown's avatar
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4280
  case SQLCOM_ROLLBACK_TO_SAVEPOINT:
unknown's avatar
unknown committed
4281
  {
4282 4283
    SAVEPOINT *sv;
    for (sv=thd->transaction.savepoints; sv; sv=sv->prev)
4284 4285 4286
    {
      if (my_strnncoll(system_charset_info,
                       (uchar *)lex->ident.str, lex->ident.length,
4287
                       (uchar *)sv->name, sv->length) == 0)
4288 4289
        break;
    }
4290
    if (sv)
4291
    {
4292
      if (ha_rollback_to_savepoint(thd, sv))
4293 4294
        res= TRUE; // cannot happen
      else
unknown's avatar
unknown committed
4295 4296 4297 4298 4299 4300 4301 4302
      {
        if ((thd->options & OPTION_STATUS_NO_TRANS_UPDATE) &&
            !thd->slave_thread)
          push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                       ER_WARNING_NOT_COMPLETE_ROLLBACK,
                       ER(ER_WARNING_NOT_COMPLETE_ROLLBACK));
        send_ok(thd);
      }
4303
      thd->transaction.savepoints=sv;
unknown's avatar
unknown committed
4304 4305
    }
    else
4306
      my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str);
unknown's avatar
unknown committed
4307
    break;
4308
  }
4309
  case SQLCOM_SAVEPOINT:
4310 4311
    if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN) ||
          thd->in_sub_stmt) || !opt_using_transactions)
unknown's avatar
unknown committed
4312
      send_ok(thd);
unknown's avatar
unknown committed
4313
    else
4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351
    {
      SAVEPOINT **sv, *newsv;
      for (sv=&thd->transaction.savepoints; *sv; sv=&(*sv)->prev)
      {
        if (my_strnncoll(system_charset_info,
                         (uchar *)lex->ident.str, lex->ident.length,
                         (uchar *)(*sv)->name, (*sv)->length) == 0)
          break;
      }
      if (*sv) /* old savepoint of the same name exists */
      {
        newsv=*sv;
        ha_release_savepoint(thd, *sv); // it cannot fail
        *sv=(*sv)->prev;
      }
      else if ((newsv=(SAVEPOINT *) alloc_root(&thd->transaction.mem_root,
                                               savepoint_alloc_size)) == 0)
      {
        my_error(ER_OUT_OF_RESOURCES, MYF(0));
        break;
      }
      newsv->name=strmake_root(&thd->transaction.mem_root,
                               lex->ident.str, lex->ident.length);
      newsv->length=lex->ident.length;
      /*
        if we'll get an error here, don't add new savepoint to the list.
        we'll lose a little bit of memory in transaction mem_root, but it'll
        be free'd when transaction ends anyway
      */
      if (ha_savepoint(thd, newsv))
        res= TRUE;
      else
      {
        newsv->prev=thd->transaction.savepoints;
        thd->transaction.savepoints=newsv;
        send_ok(thd);
      }
    }
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4352
    break;
4353 4354
  case SQLCOM_CREATE_PROCEDURE:
  case SQLCOM_CREATE_SPFUNCTION:
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4355
  {
4356
    uint namelen;
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4357
    char *name;
4358
    int sp_result= SP_INTERNAL_ERROR;
4359

4360
    DBUG_ASSERT(lex->sphead != 0);
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4361
    DBUG_ASSERT(lex->sphead->m_db.str); /* Must be initialized in the parser */
4362 4363 4364 4365 4366 4367 4368
    /*
      Verify that the database name is allowed, optionally
      lowercase it.
    */
    if (check_db_name(lex->sphead->m_db.str))
    {
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->sphead->m_db.str);
4369
      goto create_sp_error;
4370 4371 4372
    }

    /*
4373 4374 4375
      Check that a database directory with this name
      exists. Design note: This won't work on virtual databases
      like information_schema.
4376 4377 4378 4379
    */
    if (check_db_dir_existence(lex->sphead->m_db.str))
    {
      my_error(ER_BAD_DB_ERROR, MYF(0), lex->sphead->m_db.str);
4380
      goto create_sp_error;
4381 4382
    }

4383 4384
    if (check_access(thd, CREATE_PROC_ACL, lex->sphead->m_db.str, 0, 0, 0,
                     is_schema_db(lex->sphead->m_db.str)))
4385
      goto create_sp_error;
4386

4387 4388
    if (end_active_trans(thd))
      goto create_sp_error;
4389 4390

    name= lex->sphead->name(&namelen);
4391
#ifdef HAVE_DLOPEN
unknown's avatar
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4392 4393 4394
    if (lex->sphead->m_type == TYPE_ENUM_FUNCTION)
    {
      udf_func *udf = find_udf(name, namelen);
4395

unknown's avatar
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4396
      if (udf)
4397
      {
4398 4399
        my_error(ER_UDF_EXISTS, MYF(0), name);
        goto create_sp_error;
4400
      }
unknown's avatar
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4401 4402 4403
    }
#endif

4404 4405 4406
    /*
      If the definer is not specified, this means that CREATE-statement missed
      DEFINER-clause. DEFINER-clause can be missed in two cases:
4407

4408 4409 4410 4411 4412 4413 4414 4415
        - The user submitted a statement w/o the clause. This is a normal
          case, we should assign CURRENT_USER as definer.

        - Our slave received an updated from the master, that does not
          replicate definer for stored rountines. We should also assign
          CURRENT_USER as definer here, but also we should mark this routine
          as NON-SUID. This is essential for the sake of backward
          compatibility.
4416

4417 4418 4419 4420 4421 4422 4423 4424 4425 4426 4427 4428 4429 4430
          The problem is the slave thread is running under "special" user (@),
          that actually does not exist. In the older versions we do not fail
          execution of a stored routine if its definer does not exist and
          continue the execution under the authorization of the invoker
          (BUG#13198). And now if we try to switch to slave-current-user (@),
          we will fail.

          Actually, this leads to the inconsistent state of master and
          slave (different definers, different SUID behaviour), but it seems,
          this is the best we can do.
    */

    if (!lex->definer)
    {
4431
      bool local_res= FALSE;
4432 4433 4434 4435
      Query_arena original_arena;
      Query_arena *ps_arena = thd->activate_stmt_arena_if_needed(&original_arena);

      if (!(lex->definer= create_default_definer(thd)))
4436
        local_res= TRUE;
4437 4438 4439 4440

      if (ps_arena)
        thd->restore_active_arena(ps_arena, &original_arena);

4441
      /* Error has been already reported. */
4442
      if (local_res)
4443
        goto create_sp_error;
4444 4445 4446 4447 4448 4449 4450 4451 4452 4453

      if (thd->slave_thread)
        lex->sphead->m_chistics->suid= SP_IS_NOT_SUID;
    }

    /*
      If the specified definer differs from the current user, we should check
      that the current user has SUPER privilege (in order to create a stored
      routine under another user one must have SUPER privilege).
    */
4454

4455 4456 4457 4458 4459 4460 4461 4462
    else if (strcmp(lex->definer->user.str, thd->security_ctx->priv_user) ||
        my_strcasecmp(system_charset_info,
                      lex->definer->host.str,
                      thd->security_ctx->priv_host))
    {
      if (check_global_access(thd, SUPER_ACL))
      {
        my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), "SUPER");
4463
        goto create_sp_error;
4464 4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481
      }
    }

    /* Check that the specified definer exists. Emit a warning if not. */

#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (!is_acl_user(lex->definer->host.str,
                     lex->definer->user.str))
    {
      push_warning_printf(thd,
                          MYSQL_ERROR::WARN_LEVEL_NOTE,
                          ER_NO_SUCH_USER,
                          ER(ER_NO_SUCH_USER),
                          lex->definer->user.str,
                          lex->definer->host.str);
    }
#endif /* NO_EMBEDDED_ACCESS_CHECKS */

4482
    res= (sp_result= lex->sphead->create(thd));
4483
    switch (sp_result) {
4484
    case SP_OK:
unknown's avatar
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4485
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4486
      /* only add privileges if really neccessary */
4487
      if (sp_automatic_privileges && !opt_noacl &&
4488
          check_routine_access(thd, DEFAULT_CREATE_PROC_ACLS,
4489
                               lex->sphead->m_db.str, name,
4490
                               lex->sql_command == SQLCOM_CREATE_PROCEDURE, 1))
4491
      {
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4492
        if (sp_grant_privileges(thd, lex->sphead->m_db.str, name,
4493
                                lex->sql_command == SQLCOM_CREATE_PROCEDURE))
4494 4495 4496 4497
          push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                       ER_PROC_AUTO_GRANT_FAIL,
                       ER(ER_PROC_AUTO_GRANT_FAIL));
        close_thread_tables(thd);
4498
      }
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4499
#endif
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4500
    break;
4501 4502 4503 4504 4505 4506 4507 4508 4509 4510 4511 4512 4513 4514 4515 4516 4517 4518 4519
    case SP_WRITE_ROW_FAILED:
      my_error(ER_SP_ALREADY_EXISTS, MYF(0), SP_TYPE_STRING(lex), name);
    break;
    case SP_BAD_IDENTIFIER:
      my_error(ER_TOO_LONG_IDENT, MYF(0), name);
    break;
    case SP_BODY_TOO_LONG:
      my_error(ER_TOO_LONG_BODY, MYF(0), name);
    break;
    default:
      my_error(ER_SP_STORE_FAILED, MYF(0), SP_TYPE_STRING(lex), name);
    break;
    } /* end switch */

    /*
      Capture all errors within this CASE and
      clean up the environment.
    */
create_sp_error:
4520
    if (sp_result != SP_OK )
4521 4522 4523 4524
      goto error;
    send_ok(thd);
    break; /* break super switch */
  } /* end case group bracket */
4525 4526 4527 4528
  case SQLCOM_CALL:
    {
      sp_head *sp;

4529 4530 4531 4532 4533 4534 4535 4536 4537
      /*
        This will cache all SP and SF and open and lock all tables
        required for execution.
      */
      if (check_table_access(thd, SELECT_ACL, all_tables, 0) ||
	  open_and_lock_tables(thd, all_tables))
       goto error;

      /*
4538 4539
        By this moment all needed SPs should be in cache so no need to look 
        into DB. 
4540
      */
4541 4542
      if (!(sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname,
                                &thd->sp_proc_cache, TRUE)))
4543
      {
4544
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "PROCEDURE",
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4545
                 lex->spname->m_qname.str);
4546
	goto error;
4547 4548 4549
      }
      else
      {
unknown's avatar
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4550
	ha_rows select_limit;
unknown's avatar
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4551 4552
        /* bits that should be cleared in thd->server_status */
	uint bits_to_be_cleared= 0;
4553 4554 4555 4556 4557 4558 4559 4560 4561 4562 4563 4564
        /*
          Check that the stored procedure doesn't contain Dynamic SQL
          and doesn't return result sets: such stored procedures can't
          be called from a function or trigger.
        */
        if (thd->in_sub_stmt)
        {
          const char *where= (thd->in_sub_stmt & SUB_STMT_TRIGGER ?
                              "trigger" : "function");
          if (sp->is_not_allowed_in_function(where))
            goto error;
        }
4565

4566
	my_bool save_no_send_ok= thd->net.no_send_ok;
4567
	thd->net.no_send_ok= TRUE;
4568
	if (sp->m_flags & sp_head::MULTI_RESULTS)
4569
	{
4570
	  if (! (thd->client_capabilities & CLIENT_MULTI_RESULTS))
4571
	  {
4572 4573 4574 4575
            /*
              The client does not support multiple result sets being sent
              back
            */
4576
	    my_error(ER_SP_BADSELECT, MYF(0), sp->m_qname.str);
4577
	    thd->net.no_send_ok= save_no_send_ok;
4578 4579
	    goto error;
	  }
unknown's avatar
unknown committed
4580 4581 4582 4583 4584 4585 4586
          /*
            If SERVER_MORE_RESULTS_EXISTS is not set,
            then remember that it should be cleared
          */
	  bits_to_be_cleared= (~thd->server_status &
                               SERVER_MORE_RESULTS_EXISTS);
	  thd->server_status|= SERVER_MORE_RESULTS_EXISTS;
4587 4588
	}

4589
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4590
	if (check_routine_access(thd, EXECUTE_ACL,
4591
				 sp->m_db.str, sp->m_name.str, TRUE, FALSE))
4592
	{
4593
	  thd->net.no_send_ok= save_no_send_ok;
4594 4595
	  goto error;
	}
4596
#endif
unknown's avatar
unknown committed
4597 4598
	select_limit= thd->variables.select_limit;
	thd->variables.select_limit= HA_POS_ERROR;
4599

4600
        /* 
4601
          We never write CALL statements into binlog:
4602 4603 4604 4605 4606
           - If the mode is non-prelocked, each statement will be logged
             separately.
           - If the mode is prelocked, the invoking statement will care
             about writing into binlog.
          So just execute the statement.
4607
        */
4608
	res= sp->execute_procedure(thd, &lex->value_list);
4609 4610 4611
	/*
          If warnings have been cleared, we have to clear total_warn_count
          too, otherwise the clients get confused.
4612 4613 4614 4615
	 */
	if (thd->warn_list.is_empty())
	  thd->total_warn_count= 0;

unknown's avatar
unknown committed
4616
	thd->variables.select_limit= select_limit;
4617

4618
	thd->net.no_send_ok= save_no_send_ok;
unknown's avatar
unknown committed
4619
        thd->server_status&= ~bits_to_be_cleared;
4620

unknown's avatar
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4621
	if (!res)
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4622 4623
	  send_ok(thd, (ulong) (thd->row_count_func < 0 ? 0 :
                                thd->row_count_func));
4624 4625
	else
	  goto error;		// Substatement should already have sent error
4626
      }
4627
      break;
4628 4629
    }
  case SQLCOM_ALTER_PROCEDURE:
4630
  case SQLCOM_ALTER_FUNCTION:
4631
    {
4632
      int sp_result;
4633 4634 4635 4636
      sp_head *sp;
      st_sp_chistics chistics;

      memcpy(&chistics, &lex->sp_chistics, sizeof(chistics));
unknown's avatar
unknown committed
4637
      if (lex->sql_command == SQLCOM_ALTER_PROCEDURE)
4638 4639
        sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname,
                            &thd->sp_proc_cache, FALSE);
4640
      else
4641 4642
        sp= sp_find_routine(thd, TYPE_ENUM_FUNCTION, lex->spname,
                            &thd->sp_func_cache, FALSE);
unknown's avatar
unknown committed
4643
      mysql_reset_errors(thd, 0);
4644
      if (! sp)
4645 4646
      {
	if (lex->spname->m_db.str)
4647
	  sp_result= SP_KEY_NOT_FOUND;
4648 4649 4650 4651 4652 4653
	else
	{
	  my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
	  goto error;
	}
      }
4654 4655
      else
      {
4656 4657 4658
        if (check_routine_access(thd, ALTER_PROC_ACL, sp->m_db.str, 
				 sp->m_name.str,
                                 lex->sql_command == SQLCOM_ALTER_PROCEDURE, 0))
4659
	  goto error;
4660 4661 4662

        if (end_active_trans(thd)) 
          goto error;
4663
	memcpy(&lex->sp_chistics, &chistics, sizeof(lex->sp_chistics));
4664 4665
        if ((sp->m_type == TYPE_ENUM_FUNCTION) &&
            !trust_function_creators &&  mysql_bin_log.is_open() &&
4666 4667 4668 4669 4670 4671
            !sp->m_chistics->detistic &&
            (chistics.daccess == SP_CONTAINS_SQL ||
             chistics.daccess == SP_MODIFIES_SQL_DATA))
        {
          my_message(ER_BINLOG_UNSAFE_ROUTINE,
		     ER(ER_BINLOG_UNSAFE_ROUTINE), MYF(0));
4672
          sp_result= SP_INTERNAL_ERROR;
4673 4674 4675
        }
        else
        {
4676 4677 4678 4679 4680 4681
          /*
            Note that if you implement the capability of ALTER FUNCTION to
            alter the body of the function, this command should be made to
            follow the restrictions that log-bin-trust-function-creators=0
            already puts on CREATE FUNCTION.
          */
4682
          /* Conditionally writes to binlog */
4683
          if (lex->sql_command == SQLCOM_ALTER_PROCEDURE)
4684 4685
            sp_result= sp_update_procedure(thd, lex->spname,
                                           &lex->sp_chistics);
4686
          else
4687
            sp_result= sp_update_function(thd, lex->spname, &lex->sp_chistics);
4688
        }
4689
      }
4690
      switch (sp_result)
4691
      {
unknown's avatar
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4692
      case SP_OK:
4693
	send_ok(thd);
unknown's avatar
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4694 4695
	break;
      case SP_KEY_NOT_FOUND:
4696 4697
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
unknown's avatar
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4698 4699
	goto error;
      default:
4700 4701
	my_error(ER_SP_CANT_ALTER, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
unknown's avatar
unknown committed
4702
	goto error;
4703
      }
4704
      break;
4705 4706
    }
  case SQLCOM_DROP_PROCEDURE:
4707
  case SQLCOM_DROP_FUNCTION:
4708
    {
4709
      int sp_result;
4710 4711
      int type= (lex->sql_command == SQLCOM_DROP_PROCEDURE ?
                 TYPE_ENUM_PROCEDURE : TYPE_ENUM_FUNCTION);
4712

4713
      sp_result= sp_routine_exists_in_table(thd, type, lex->spname);
unknown's avatar
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4714
      mysql_reset_errors(thd, 0);
4715
      if (sp_result == SP_OK)
4716
      {
4717 4718 4719
        char *db= lex->spname->m_db.str;
	char *name= lex->spname->m_name.str;

4720 4721
	if (check_routine_access(thd, ALTER_PROC_ACL, db, name,
                                 lex->sql_command == SQLCOM_DROP_PROCEDURE, 0))
unknown's avatar
merge  
unknown committed
4722
          goto error;
4723 4724 4725

        if (end_active_trans(thd)) 
          goto error;
unknown's avatar
unknown committed
4726
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4727
	if (sp_automatic_privileges && !opt_noacl &&
4728 4729
	    sp_revoke_privileges(thd, db, name, 
                                 lex->sql_command == SQLCOM_DROP_PROCEDURE))
4730 4731 4732 4733 4734
	{
	  push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 
		       ER_PROC_AUTO_REVOKE_FAIL,
		       ER(ER_PROC_AUTO_REVOKE_FAIL));
	}
unknown's avatar
unknown committed
4735
#endif
4736
          /* Conditionally writes to binlog */
4737 4738
	if (lex->sql_command == SQLCOM_DROP_PROCEDURE)
	  sp_result= sp_drop_procedure(thd, lex->spname);
4739
	else
4740
	  sp_result= sp_drop_function(thd, lex->spname);
4741 4742 4743
      }
      else
      {
4744
#ifdef HAVE_DLOPEN
4745 4746 4747 4748 4749 4750
	if (lex->sql_command == SQLCOM_DROP_FUNCTION)
	{
          udf_func *udf = find_udf(lex->spname->m_name.str,
                                   lex->spname->m_name.length);
          if (udf)
          {
4751
	    if (check_access(thd, DELETE_ACL, "mysql", 0, 1, 0, 0))
4752
	      goto error;
4753 4754

	    /* Does NOT write to binlog */
4755
	    if (!(res = mysql_drop_function(thd, &lex->spname->m_name)))
4756
	    {
4757 4758
	      send_ok(thd);
	      break;
4759 4760
	    }
	  }
4761
	}
4762
#endif
4763
	if (lex->spname->m_db.str)
4764
	  sp_result= SP_KEY_NOT_FOUND;
4765 4766 4767 4768 4769
	else
	{
	  my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
	  goto error;
	}
4770
      }
4771 4772
      res= sp_result;
      switch (sp_result) {
4773
      case SP_OK:
4774
	send_ok(thd);
4775 4776
	break;
      case SP_KEY_NOT_FOUND:
4777 4778
	if (lex->drop_if_exists)
	{
4779
	  push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
4780
			      ER_SP_DOES_NOT_EXIST, ER(ER_SP_DOES_NOT_EXIST),
4781
			      SP_COM_STRING(lex), lex->spname->m_name.str);
unknown's avatar
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4782
	  res= FALSE;
4783 4784 4785
	  send_ok(thd);
	  break;
	}
4786 4787
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4788 4789
	goto error;
      default:
4790 4791
	my_error(ER_SP_DROP_FAILED, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4792
	goto error;
4793
      }
4794
      break;
4795
    }
unknown's avatar
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4796 4797
  case SQLCOM_SHOW_CREATE_PROC:
    {
4798
      if (lex->spname->m_name.length > NAME_LEN)
unknown's avatar
unknown committed
4799
      {
4800
	my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str);
unknown's avatar
unknown committed
4801 4802
	goto error;
      }
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4803
      if (sp_show_create_procedure(thd, lex->spname) != SP_OK)
4804
      {			/* We don't distinguish between errors for now */
4805 4806
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
unknown's avatar
unknown committed
4807 4808 4809 4810 4811 4812
	goto error;
      }
      break;
    }
  case SQLCOM_SHOW_CREATE_FUNC:
    {
4813
      if (lex->spname->m_name.length > NAME_LEN)
unknown's avatar
unknown committed
4814
      {
4815
	my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str);
unknown's avatar
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4816 4817
	goto error;
      }
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4818
      if (sp_show_create_function(thd, lex->spname) != SP_OK)
4819
      {			/* We don't distinguish between errors for now */
4820 4821
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
unknown's avatar
unknown committed
4822 4823 4824 4825 4826 4827
	goto error;
      }
      break;
    }
  case SQLCOM_SHOW_STATUS_PROC:
    {
4828
      res= sp_show_status_procedure(thd, (lex->wild ?
unknown's avatar
unknown committed
4829 4830 4831 4832 4833
					  lex->wild->ptr() : NullS));
      break;
    }
  case SQLCOM_SHOW_STATUS_FUNC:
    {
4834
      res= sp_show_status_function(thd, (lex->wild ? 
unknown's avatar
unknown committed
4835 4836 4837
					 lex->wild->ptr() : NullS));
      break;
    }
unknown's avatar
unknown committed
4838 4839 4840 4841 4842 4843 4844 4845 4846 4847 4848 4849
#ifndef DBUG_OFF
  case SQLCOM_SHOW_PROC_CODE:
  case SQLCOM_SHOW_FUNC_CODE:
    {
      sp_head *sp;

      if (lex->spname->m_name.length > NAME_LEN)
      {
	my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str);
	goto error;
      }
      if (lex->sql_command == SQLCOM_SHOW_PROC_CODE)
unknown's avatar
unknown committed
4850 4851
        sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname,
                            &thd->sp_proc_cache, FALSE);
unknown's avatar
unknown committed
4852
      else
unknown's avatar
unknown committed
4853 4854
        sp= sp_find_routine(thd, TYPE_ENUM_FUNCTION, lex->spname,
                            &thd->sp_func_cache, FALSE);
4855
      if (!sp || sp->show_routine_code(thd))
4856 4857
      {
        /* We don't distinguish between errors for now */
unknown's avatar
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4858 4859 4860 4861 4862 4863 4864
        my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
        goto error;
      }
      break;
    }
#endif // ifndef DBUG_OFF
unknown's avatar
VIEW  
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4865 4866
  case SQLCOM_CREATE_VIEW:
    {
4867 4868 4869
      if (end_active_trans(thd))
        goto error;

4870
      res= mysql_create_view(thd, first_table, thd->lex->create_view_mode);
unknown's avatar
VIEW  
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4871 4872 4873 4874
      break;
    }
  case SQLCOM_DROP_VIEW:
    {
unknown's avatar
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4875 4876 4877
      if (check_table_access(thd, DROP_ACL, all_tables, 0) ||
          end_active_trans(thd))
        goto error;
4878 4879
      /* Conditionally writes to binlog. */
      res= mysql_drop_view(thd, first_table, thd->lex->drop_mode);
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VIEW  
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4880 4881
      break;
    }
4882 4883
  case SQLCOM_CREATE_TRIGGER:
  {
4884 4885 4886
    if (end_active_trans(thd))
      goto error;

4887
    /* Conditionally writes to binlog. */
4888 4889
    res= mysql_create_or_drop_trigger(thd, all_tables, 1);

4890 4891 4892 4893
    break;
  }
  case SQLCOM_DROP_TRIGGER:
  {
4894 4895 4896
    if (end_active_trans(thd))
      goto error;

4897
    /* Conditionally writes to binlog. */
4898 4899 4900
    res= mysql_create_or_drop_trigger(thd, all_tables, 0);
    break;
  }
4901
  case SQLCOM_XA_START:
4902 4903
    if (thd->transaction.xid_state.xa_state == XA_IDLE &&
        thd->lex->xa_opt == XA_RESUME)
4904
    {
4905
      if (! thd->transaction.xid_state.xid.eq(thd->lex->xid))
4906 4907 4908 4909
      {
        my_error(ER_XAER_NOTA, MYF(0));
        break;
      }
4910
      thd->transaction.xid_state.xa_state=XA_ACTIVE;
4911 4912 4913
      send_ok(thd);
      break;
    }
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4914
    if (thd->lex->xa_opt != XA_NONE)
4915 4916 4917 4918
    { // JOIN is not supported yet. TODO
      my_error(ER_XAER_INVAL, MYF(0));
      break;
    }
4919
    if (thd->transaction.xid_state.xa_state != XA_NOTR)
4920
    {
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4921
      my_error(ER_XAER_RMFAIL, MYF(0),
4922
               xa_state_names[thd->transaction.xid_state.xa_state]);
4923 4924 4925 4926 4927 4928 4929
      break;
    }
    if (thd->active_transaction() || thd->locked_tables)
    {
      my_error(ER_XAER_OUTSIDE, MYF(0));
      break;
    }
4930 4931 4932 4933 4934 4935 4936 4937 4938
    if (xid_cache_search(thd->lex->xid))
    {
      my_error(ER_XAER_DUPID, MYF(0));
      break;
    }
    DBUG_ASSERT(thd->transaction.xid_state.xid.is_null());
    thd->transaction.xid_state.xa_state=XA_ACTIVE;
    thd->transaction.xid_state.xid.set(thd->lex->xid);
    xid_cache_insert(&thd->transaction.xid_state);
4939 4940 4941 4942 4943 4944 4945 4946 4947 4948 4949 4950
    thd->options= ((thd->options & (ulong) ~(OPTION_STATUS_NO_TRANS_UPDATE)) |
                   OPTION_BEGIN);
    thd->server_status|= SERVER_STATUS_IN_TRANS;
    send_ok(thd);
    break;
  case SQLCOM_XA_END:
    /* fake it */
    if (thd->lex->xa_opt != XA_NONE)
    { // SUSPEND and FOR MIGRATE are not supported yet. TODO
      my_error(ER_XAER_INVAL, MYF(0));
      break;
    }
4951
    if (thd->transaction.xid_state.xa_state != XA_ACTIVE)
4952
    {
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4953
      my_error(ER_XAER_RMFAIL, MYF(0),
4954
               xa_state_names[thd->transaction.xid_state.xa_state]);
4955 4956
      break;
    }
4957
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
4958 4959 4960 4961
    {
      my_error(ER_XAER_NOTA, MYF(0));
      break;
    }
4962
    thd->transaction.xid_state.xa_state=XA_IDLE;
4963 4964 4965
    send_ok(thd);
    break;
  case SQLCOM_XA_PREPARE:
4966
    if (thd->transaction.xid_state.xa_state != XA_IDLE)
4967
    {
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4968
      my_error(ER_XAER_RMFAIL, MYF(0),
4969
               xa_state_names[thd->transaction.xid_state.xa_state]);
4970 4971
      break;
    }
4972
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
4973 4974 4975 4976 4977 4978 4979
    {
      my_error(ER_XAER_NOTA, MYF(0));
      break;
    }
    if (ha_prepare(thd))
    {
      my_error(ER_XA_RBROLLBACK, MYF(0));
4980 4981
      xid_cache_delete(&thd->transaction.xid_state);
      thd->transaction.xid_state.xa_state=XA_NOTR;
4982 4983
      break;
    }
4984
    thd->transaction.xid_state.xa_state=XA_PREPARED;
4985 4986 4987
    send_ok(thd);
    break;
  case SQLCOM_XA_COMMIT:
4988
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
4989
    {
4990 4991
      XID_STATE *xs=xid_cache_search(thd->lex->xid);
      if (!xs || xs->in_thd)
4992
        my_error(ER_XAER_NOTA, MYF(0));
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unknown committed
4993
      else
4994 4995 4996
      {
        ha_commit_or_rollback_by_xid(thd->lex->xid, 1);
        xid_cache_delete(xs);
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4997
        send_ok(thd);
4998
      }
4999 5000
      break;
    }
5001
    if (thd->transaction.xid_state.xa_state == XA_IDLE &&
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5002
        thd->lex->xa_opt == XA_ONE_PHASE)
5003
    {
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5004 5005 5006
      int r;
      if ((r= ha_commit(thd)))
        my_error(r == 1 ? ER_XA_RBROLLBACK : ER_XAER_RMERR, MYF(0));
5007 5008 5009
      else
        send_ok(thd);
    }
5010
    else if (thd->transaction.xid_state.xa_state == XA_PREPARED &&
unknown's avatar
unknown committed
5011
             thd->lex->xa_opt == XA_NONE)
5012
    {
5013 5014 5015
      if (wait_if_global_read_lock(thd, 0, 0))
      {
        ha_rollback(thd);
5016
        my_error(ER_XAER_RMERR, MYF(0));
5017
      }
5018
      else
5019 5020 5021 5022 5023 5024 5025
      {
        if (ha_commit_one_phase(thd, 1))
          my_error(ER_XAER_RMERR, MYF(0));
        else
          send_ok(thd);
        start_waiting_global_read_lock(thd);
      }
5026 5027 5028
    }
    else
    {
unknown's avatar
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5029
      my_error(ER_XAER_RMFAIL, MYF(0),
5030
               xa_state_names[thd->transaction.xid_state.xa_state]);
5031 5032 5033 5034
      break;
    }
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
5035 5036
    xid_cache_delete(&thd->transaction.xid_state);
    thd->transaction.xid_state.xa_state=XA_NOTR;
5037 5038
    break;
  case SQLCOM_XA_ROLLBACK:
5039
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
5040
    {
5041 5042
      XID_STATE *xs=xid_cache_search(thd->lex->xid);
      if (!xs || xs->in_thd)
5043
        my_error(ER_XAER_NOTA, MYF(0));
unknown's avatar
unknown committed
5044
      else
5045 5046 5047
      {
        ha_commit_or_rollback_by_xid(thd->lex->xid, 0);
        xid_cache_delete(xs);
unknown's avatar
unknown committed
5048
        send_ok(thd);
5049
      }
5050 5051
      break;
    }
5052 5053
    if (thd->transaction.xid_state.xa_state != XA_IDLE &&
        thd->transaction.xid_state.xa_state != XA_PREPARED)
5054
    {
unknown's avatar
unknown committed
5055
      my_error(ER_XAER_RMFAIL, MYF(0),
5056
               xa_state_names[thd->transaction.xid_state.xa_state]);
5057 5058 5059 5060 5061 5062 5063 5064
      break;
    }
    if (ha_rollback(thd))
      my_error(ER_XAER_RMERR, MYF(0));
    else
      send_ok(thd);
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
5065 5066
    xid_cache_delete(&thd->transaction.xid_state);
    thd->transaction.xid_state.xa_state=XA_NOTR;
5067 5068
    break;
  case SQLCOM_XA_RECOVER:
5069
    res= mysql_xa_recover(thd);
5070 5071
    break;
  default:
5072
#ifndef EMBEDDED_LIBRARY
5073
    DBUG_ASSERT(0);                             /* Impossible */
5074
#endif
5075
    send_ok(thd);
unknown's avatar
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5076 5077
    break;
  }
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5078
  thd->proc_info="query end";
5079
  /* Two binlog-related cleanups: */
5080 5081 5082 5083 5084 5085 5086 5087 5088 5089 5090 5091 5092

  /*
    Reset system variables temporarily modified by SET ONE SHOT.

    Exception: If this is a SET, do nothing. This is to allow
    mysqlbinlog to print many SET commands (in this case we want the
    charset temp setting to live until the real query). This is also
    needed so that SET CHARACTER_SET_CLIENT... does not cancel itself
    immediately.
  */
  if (thd->one_shot_set && lex->sql_command != SQLCOM_SET_OPTION)
    reset_one_shot_variables(thd);

5093
  /*
5094 5095 5096 5097 5098 5099
    The return value for ROW_COUNT() is "implementation dependent" if the
    statement is not DELETE, INSERT or UPDATE, but -1 is what JDBC and ODBC
    wants.

    We do not change the value for a CALL or EXECUTE statement, so the value
    generated by the last called (or executed) statement is preserved.
5100
   */
5101 5102
  if (lex->sql_command != SQLCOM_CALL && lex->sql_command != SQLCOM_EXECUTE &&
      uc_update_queries[lex->sql_command]<2)
5103
    thd->row_count_func= -1;
5104 5105

  goto end;
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5106 5107

error:
5108 5109 5110 5111 5112 5113 5114 5115 5116 5117 5118 5119
  res= TRUE;

end:
  if (need_start_waiting)
  {
    /*
      Release the protection against the global read lock and wake
      everyone, who might want to set a global read lock.
    */
    start_waiting_global_read_lock(thd);
  }
  DBUG_RETURN(res || thd->net.report_error);
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5120 5121 5122
}


unknown's avatar
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5123
/*
5124
  Check grants for commands which work only with one table.
unknown's avatar
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5125

5126
  SYNOPSIS
5127
    check_single_table_access()
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5128
    thd			Thread handler
5129
    privilege		requested privilege
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VIEW  
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5130
    all_tables		global table list of query
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5131 5132 5133

  RETURN
    0 - OK
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5134
    1 - access denied, error is sent to client
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5135 5136
*/

5137 5138
bool check_single_table_access(THD *thd, ulong privilege, 
                               TABLE_LIST *all_tables)
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5139
{
5140 5141 5142 5143 5144 5145
  Security_context * backup_ctx= thd->security_ctx;

  /* we need to switch to the saved context (if any) */
  if (all_tables->security_ctx)
    thd->security_ctx= all_tables->security_ctx;

5146 5147 5148 5149 5150 5151 5152 5153
  const char *db_name;
  if ((all_tables->view || all_tables->field_translation) &&
      !all_tables->schema_table)
    db_name= all_tables->view_db.str;
  else
    db_name= all_tables->db;

  if (check_access(thd, privilege, db_name,
5154 5155
		   &all_tables->grant.privilege, 0, 0,
                   test(all_tables->schema_table)))
5156
    goto deny;
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5157

unknown's avatar
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5158
  /* Show only 1 table for check_grant */
unknown's avatar
VIEW  
unknown committed
5159
  if (grant_option && check_grant(thd, privilege, all_tables, 0, 1, 0))
5160 5161 5162
    goto deny;

  thd->security_ctx= backup_ctx;
5163 5164 5165 5166 5167 5168 5169 5170 5171 5172 5173 5174 5175 5176 5177 5178 5179 5180 5181 5182 5183 5184 5185 5186 5187 5188
  return 0;

deny:
  thd->security_ctx= backup_ctx;
  return 1;
}

/*
  Check grants for commands which work only with one table and all other
  tables belonging to subselects or implicitly opened tables.

  SYNOPSIS
    check_one_table_access()
    thd			Thread handler
    privilege		requested privilege
    all_tables		global table list of query

  RETURN
    0 - OK
    1 - access denied, error is sent to client
*/

bool check_one_table_access(THD *thd, ulong privilege, TABLE_LIST *all_tables)
{
  if (check_single_table_access (thd,privilege,all_tables))
    return 1;
unknown's avatar
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5189

5190
  /* Check rights on tables of subselects and implictly opened tables */
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5191
  TABLE_LIST *subselects_tables, *view= all_tables->view ? all_tables : 0;
unknown's avatar
VIEW  
unknown committed
5192
  if ((subselects_tables= all_tables->next_global))
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unknown committed
5193
  {
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5194 5195 5196 5197 5198 5199 5200 5201 5202 5203 5204 5205
    /*
      Access rights asked for the first table of a view should be the same
      as for the view
    */
    if (view && subselects_tables->belong_to_view == view)
    {
      if (check_single_table_access (thd, privilege, subselects_tables))
        return 1;
      subselects_tables= subselects_tables->next_global;
    }
    if (subselects_tables &&
        (check_table_access(thd, SELECT_ACL, subselects_tables, 0)))
5206
      return 1;
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5207 5208
  }
  return 0;
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5209 5210 5211
}


unknown's avatar
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5212
/****************************************************************************
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5213
  Get the user (global) and database privileges for all used tables
unknown's avatar
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5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224 5225 5226

  NOTES
    The idea of EXTRA_ACL is that one will be granted access to the table if
    one has the asked privilege on any column combination of the table; For
    example to be able to check a table one needs to have SELECT privilege on
    any column of the table.

  RETURN
    0  ok
    1  If we can't get the privileges and we don't use table/column grants.

    save_priv	In this we store global and db level grants for the table
		Note that we don't store db level grants if the global grants
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5227 5228
                is enough to satisfy the request and the global grants contains
                a SELECT grant.
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5229 5230 5231
****************************************************************************/

bool
unknown's avatar
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5232
check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
5233
	     bool dont_check_global_grants, bool no_errors, bool schema_db)
unknown's avatar
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5234
{
5235
  Security_context *sctx= thd->security_ctx;
unknown's avatar
unknown committed
5236 5237
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  ulong db_access;
unknown's avatar
unknown committed
5238
  bool  db_is_pattern= test(want_access & GRANT_ACL);
unknown's avatar
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5239 5240
#endif
  ulong dummy;
5241 5242
  DBUG_ENTER("check_access");
  DBUG_PRINT("enter",("db: %s  want_access: %lu  master_access: %lu",
5243
                      db ? db : "", want_access, sctx->master_access));
unknown's avatar
unknown committed
5244 5245 5246 5247 5248
  if (save_priv)
    *save_priv=0;
  else
    save_priv= &dummy;

5249
  if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
unknown's avatar
unknown committed
5250
  {
5251
    DBUG_PRINT("error",("No database"));
5252
    if (!no_errors)
unknown's avatar
unknown committed
5253 5254
      my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR),
                 MYF(0));                       /* purecov: tested */
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unknown committed
5255
    DBUG_RETURN(TRUE);				/* purecov: tested */
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5256 5257
  }

5258 5259 5260 5261 5262
  if (schema_db)
  {
    if (want_access & ~(SELECT_ACL | EXTRA_ACL))
    {
      if (!no_errors)
5263 5264
      {
        const char *db_name= db ? db : thd->db;
5265
        my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
5266 5267
                 sctx->priv_user, sctx->priv_host, db_name);
      }
5268 5269 5270 5271 5272 5273 5274 5275 5276
      DBUG_RETURN(TRUE);
    }
    else
    {
      *save_priv= SELECT_ACL;
      DBUG_RETURN(FALSE);
    }
  }

unknown's avatar
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5277 5278 5279
#ifdef NO_EMBEDDED_ACCESS_CHECKS
  DBUG_RETURN(0);
#else
5280
  if ((sctx->master_access & want_access) == want_access)
unknown's avatar
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5281
  {
5282 5283 5284 5285 5286
    /*
      If we don't have a global SELECT privilege, we have to get the database
      specific access rights to be able to handle queries of type
      UPDATE t1 SET a=1 WHERE b > 0
    */
5287 5288
    db_access= sctx->db_access;
    if (!(sctx->master_access & SELECT_ACL) &&
unknown's avatar
unknown committed
5289
	(db && (!thd->db || db_is_pattern || strcmp(db,thd->db))))
5290 5291 5292
      db_access=acl_get(sctx->host, sctx->ip, sctx->priv_user, db,
                        db_is_pattern);
    *save_priv=sctx->master_access | db_access;
unknown's avatar
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5293
    DBUG_RETURN(FALSE);
unknown's avatar
unknown committed
5294
  }
5295
  if (((want_access & ~sctx->master_access) & ~(DB_ACLS | EXTRA_ACL)) ||
5296
      ! db && dont_check_global_grants)
unknown's avatar
unknown committed
5297
  {						// We can never grant this
5298
    DBUG_PRINT("error",("No possible access"));
5299
    if (!no_errors)
5300
      my_error(ER_ACCESS_DENIED_ERROR, MYF(0),
5301 5302
               sctx->priv_user,
               sctx->priv_host,
5303 5304 5305
               (thd->password ?
                ER(ER_YES) :
                ER(ER_NO)));                    /* purecov: tested */
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5306
    DBUG_RETURN(TRUE);				/* purecov: tested */
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5307 5308 5309
  }

  if (db == any_db)
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5310
    DBUG_RETURN(FALSE);				// Allow select on anything
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5311

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5312
  if (db && (!thd->db || db_is_pattern || strcmp(db,thd->db)))
5313 5314
    db_access= acl_get(sctx->host, sctx->ip, sctx->priv_user, db,
                       db_is_pattern);
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5315
  else
5316
    db_access= sctx->db_access;
5317
  DBUG_PRINT("info",("db_access: %lu", db_access));
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5318
  /* Remove SHOW attribute and access rights we already have */
5319
  want_access &= ~(sctx->master_access | EXTRA_ACL);
5320 5321
  DBUG_PRINT("info",("db_access: %lu  want_access: %lu",
                     db_access, want_access));
5322
  db_access= ((*save_priv=(db_access | sctx->master_access)) & want_access);
5323 5324

  /* grant_option is set if there exists a single table or column grant */
unknown's avatar
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5325
  if (db_access == want_access ||
5326
      (grant_option && !dont_check_global_grants &&
5327
       !(want_access & ~(db_access | TABLE_ACLS | PROC_ACLS))))
unknown's avatar
unknown committed
5328
    DBUG_RETURN(FALSE);				/* Ok */
5329 5330

  DBUG_PRINT("error",("Access denied"));
5331
  if (!no_errors)
5332
    my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
5333
             sctx->priv_user, sctx->priv_host,
5334 5335 5336
             (db ? db : (thd->db ?
                         thd->db :
                         "unknown")));          /* purecov: tested */
unknown's avatar
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5337
  DBUG_RETURN(TRUE);				/* purecov: tested */
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5338
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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5339 5340 5341
}


5342 5343 5344 5345 5346 5347 5348 5349 5350
/*
  check for global access and give descriptive error message if it fails

  SYNOPSIS
    check_global_access()
    thd			Thread handler
    want_access		Use should have any of these global rights

  WARNING
5351
    One gets access right if one has ANY of the rights in want_access
5352 5353 5354 5355 5356 5357 5358 5359
    This is useful as one in most cases only need one global right,
    but in some case we want to check if the user has SUPER or
    REPL_CLIENT_ACL rights.

  RETURN
    0	ok
    1	Access denied.  In this case an error is sent to the client
*/
unknown's avatar
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5360 5361

bool check_global_access(THD *thd, ulong want_access)
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5362
{
unknown's avatar
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5363 5364 5365
#ifdef NO_EMBEDDED_ACCESS_CHECKS
  return 0;
#else
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5366
  char command[128];
5367
  if ((thd->security_ctx->master_access & want_access))
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5368 5369
    return 0;
  get_privilege_desc(command, sizeof(command), want_access);
5370
  my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), command);
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5371
  return 1;
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5372
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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5373 5374 5375
}


unknown's avatar
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5376
/*
5377 5378 5379 5380 5381 5382 5383 5384 5385 5386 5387 5388 5389 5390 5391 5392 5393 5394 5395 5396
  Check the privilege for all used tables.

  SYNOPSYS
    check_table_access()
      thd          Thread context
      want_access  Privileges requested
      tables       List of tables to be checked
      no_errors    FALSE/TRUE - report/don't report error to
                   the client (using my_error() call).

  NOTES
    Table privileges are cached in the table list for GRANT checking.
    This functions assumes that table list used and
    thd->lex->query_tables_own_last value correspond to each other
    (the latter should be either 0 or point to next_global member
    of one of elements of this table list).

  RETURN VALUE
    FALSE - OK
    TRUE  - Access denied
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5397 5398
*/

5399
bool
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5400
check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables,
5401
		   bool no_errors)
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5402
{
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5403 5404
  uint found=0;
  ulong found_access=0;
5405
#ifndef EMBEDDED_LIBRARY
5406
  TABLE_LIST *org_tables= tables;
5407
#endif
5408
  TABLE_LIST *first_not_own_table= thd->lex->first_not_own_table();
5409
  Security_context *sctx= thd->security_ctx, *backup_ctx= thd->security_ctx;
5410
  /*
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5411 5412 5413
    The check that first_not_own_table is not reached is for the case when
    the given table list refers to the list for prelocking (contains tables
    of other queries). For simple queries first_not_own_table is 0.
5414
  */
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  for (; tables != first_not_own_table; tables= tables->next_global)
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5416
  {
5417 5418 5419 5420 5421
    if (tables->security_ctx)
      sctx= tables->security_ctx;
    else
      sctx= backup_ctx;

5422
    if (tables->schema_table && 
5423
        (want_access & ~(SELECT_ACL | EXTRA_ACL | FILE_ACL)))
5424 5425 5426
    {
      if (!no_errors)
        my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
5427
                 sctx->priv_user, sctx->priv_host,
5428 5429 5430
                 information_schema_name.str);
      return TRUE;
    }
5431 5432 5433 5434 5435
    /*
       Register access for view underlying table.
       Remove SHOW_VIEW_ACL, because it will be checked during making view
     */
    tables->grant.orig_want_privilege= (want_access & ~SHOW_VIEW_ACL);
5436
    if (tables->derived || tables->schema_table ||
5437
        (tables->table && (int)tables->table->s->tmp_table) ||
5438 5439
        my_tz_check_n_skip_implicit_tables(&tables,
                                           thd->lex->time_zone_tables_used))
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5440
      continue;
5441 5442
    thd->security_ctx= sctx;
    if ((sctx->master_access & want_access) ==
5443
        (want_access & ~EXTRA_ACL) &&
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5444
	thd->db)
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5445
      tables->grant.privilege= want_access;
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5446
    else if (tables->db && thd->db && strcmp(tables->db, thd->db) == 0)
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5447 5448 5449 5450 5451
    {
      if (found && !grant_option)		// db already checked
	tables->grant.privilege=found_access;
      else
      {
5452
	if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
5453
			 0, no_errors, test(tables->schema_table)))
5454
	  goto deny;                            // Access denied
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5455
	found_access=tables->grant.privilege;
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5456
	found=1;
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5457 5458
      }
    }
5459
    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
5460
			  0, no_errors, test(tables->schema_table)))
5461
      goto deny;
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5462
  }
5463
  thd->security_ctx= backup_ctx;
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5464
  if (grant_option)
5465
    return check_grant(thd,want_access & ~EXTRA_ACL,org_tables,
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5466
		       test(want_access & EXTRA_ACL), UINT_MAX, no_errors);
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5467
  return FALSE;
5468 5469 5470
deny:
  thd->security_ctx= backup_ctx;
  return TRUE;
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5471 5472
}

5473

5474
bool
5475 5476
check_routine_access(THD *thd, ulong want_access,char *db, char *name,
		     bool is_proc, bool no_errors)
5477 5478 5479 5480 5481
{
  TABLE_LIST tables[1];
  
  bzero((char *)tables, sizeof(TABLE_LIST));
  tables->db= db;
5482
  tables->table_name= tables->alias= name;
5483
  
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  /*
    The following test is just a shortcut for check_access() (to avoid
    calculating db_access) under the assumption that it's common to
    give persons global right to execute all stored SP (but not
    necessary to create them).
  */
  if ((thd->security_ctx->master_access & want_access) == want_access)
5491 5492
    tables->grant.privilege= want_access;
  else if (check_access(thd,want_access,db,&tables->grant.privilege,
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5493
			0, no_errors, 0))
5494 5495
    return TRUE;
  
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5496
#ifndef NO_EMBEDDED_ACCESS_CHECKS
5497
  if (grant_option)
5498
    return check_grant_routine(thd, want_access, tables, is_proc, no_errors);
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5499
#endif
5500 5501 5502 5503

  return FALSE;
}

5504 5505 5506 5507 5508 5509 5510 5511 5512 5513 5514 5515 5516 5517 5518

/*
  Check if the routine has any of the routine privileges

  SYNOPSIS
    check_some_routine_access()
    thd		 Thread handler
    db           Database name
    name         Routine name

  RETURN
    0            ok
    1            error
*/

5519 5520
bool check_some_routine_access(THD *thd, const char *db, const char *name,
                               bool is_proc)
5521 5522
{
  ulong save_priv;
5523
  if (thd->security_ctx->master_access & SHOW_PROC_ACLS)
5524
    return FALSE;
5525 5526 5527 5528 5529
  /*
    There are no routines in information_schema db. So we can safely
    pass zero to last paramter of check_access function
  */
  if (!check_access(thd, SHOW_PROC_ACLS, db, &save_priv, 0, 1, 0) ||
5530 5531
      (save_priv & SHOW_PROC_ACLS))
    return FALSE;
5532
  return check_routine_level_acl(thd, db, name, is_proc);
5533 5534 5535
}


5536 5537 5538 5539 5540 5541 5542 5543 5544 5545 5546 5547 5548 5549 5550 5551 5552 5553 5554 5555 5556 5557 5558 5559 5560
/*
  Check if the given table has any of the asked privileges

  SYNOPSIS
    check_some_access()
    thd		 Thread handler
    want_access	 Bitmap of possible privileges to check for

  RETURN
    0  ok
    1  error
*/


bool check_some_access(THD *thd, ulong want_access, TABLE_LIST *table)
{
  ulong access;
  DBUG_ENTER("check_some_access");

  /* This loop will work as long as we have less than 32 privileges */
  for (access= 1; access < want_access ; access<<= 1)
  {
    if (access & want_access)
    {
      if (!check_access(thd, access, table->db,
5561 5562
                        &table->grant.privilege, 0, 1,
                        test(table->schema_table)) &&
5563 5564 5565 5566 5567 5568 5569 5570 5571
          !grant_option || !check_grant(thd, access, table, 0, 1, 1))
        DBUG_RETURN(0);
    }
  }
  DBUG_PRINT("exit",("no matching access rights"));
  DBUG_RETURN(1);
}


5572 5573
bool check_merge_table_access(THD *thd, char *db,
			      TABLE_LIST *table_list)
5574 5575 5576 5577
{
  int error=0;
  if (table_list)
  {
5578
    /* Check that all tables use the current database */
5579
    TABLE_LIST *tmp;
unknown's avatar
VIEW  
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5580
    for (tmp= table_list; tmp; tmp= tmp->next_local)
5581 5582 5583 5584
    {
      if (!tmp->db || !tmp->db[0])
	tmp->db=db;
    }
5585
    error=check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
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5586
			     table_list,0);
5587 5588 5589 5590
  }
  return error;
}

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5591 5592 5593

static bool check_db_used(THD *thd,TABLE_LIST *tables)
{
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5594
  char *current_db= NULL;
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VIEW  
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5595
  for (; tables; tables= tables->next_global)
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5596
  {
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5597
    if (tables->db == NULL)
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    {
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      /*
        This code never works and should be removed in 5.1.  All tables
        that are added to the list of tables should already have its
        database field initialized properly (see st_lex::add_table_to_list).
      */
      DBUG_ASSERT(0);
      if (thd->copy_db_to(&current_db, 0))
        return TRUE;
      tables->db= current_db;
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5608 5609 5610 5611
    }
  }
  return FALSE;
}
5612

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5613 5614 5615 5616 5617 5618 5619 5620 5621 5622
/****************************************************************************
	Check stack size; Send error if there isn't enough stack to continue
****************************************************************************/

#if STACK_DIRECTION < 0
#define used_stack(A,B) (long) (A - B)
#else
#define used_stack(A,B) (long) (B - A)
#endif

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5623 5624 5625 5626
#ifndef DBUG_OFF
long max_stack_used;
#endif

5627
#ifndef EMBEDDED_LIBRARY
5628 5629 5630 5631 5632 5633 5634 5635
/*
  Note: The 'buf' parameter is necessary, even if it is unused here.
  - fix_fields functions has a "dummy" buffer large enough for the
    corresponding exec. (Thus we only have to check in fix_fields.)
  - Passing to check_stack_overrun() prevents the compiler from removing it.
 */
bool check_stack_overrun(THD *thd, long margin,
			 char *buf __attribute__((unused)))
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5636 5637
{
  long stack_used;
5638
  DBUG_ASSERT(thd == current_thd);
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5639
  if ((stack_used=used_stack(thd->thread_stack,(char*) &stack_used)) >=
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5640
      (long) (thread_stack - margin))
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5641
  {
5642 5643 5644
    sprintf(errbuff[0],ER(ER_STACK_OVERRUN_NEED_MORE),
            stack_used,thread_stack,margin);
    my_message(ER_STACK_OVERRUN_NEED_MORE,errbuff[0],MYF(0));
5645
    thd->fatal_error();
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5646 5647
    return 1;
  }
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5648 5649 5650
#ifndef DBUG_OFF
  max_stack_used= max(max_stack_used, stack_used);
#endif
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5651 5652
  return 0;
}
5653
#endif /* EMBEDDED_LIBRARY */
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5654 5655 5656 5657

#define MY_YACC_INIT 1000			// Start with big alloc
#define MY_YACC_MAX  32000			// Because of 'short'

5658
bool my_yyoverflow(short **yyss, YYSTYPE **yyvs, ulong *yystacksize)
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5659
{
5660
  LEX	*lex= current_thd->lex;
5661
  ulong old_info=0;
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5662 5663 5664 5665 5666 5667 5668 5669 5670 5671 5672 5673 5674 5675 5676 5677 5678 5679 5680 5681 5682 5683 5684 5685 5686 5687
  if ((uint) *yystacksize >= MY_YACC_MAX)
    return 1;
  if (!lex->yacc_yyvs)
    old_info= *yystacksize;
  *yystacksize= set_zone((*yystacksize)*2,MY_YACC_INIT,MY_YACC_MAX);
  if (!(lex->yacc_yyvs= (char*)
	my_realloc((gptr) lex->yacc_yyvs,
		   *yystacksize*sizeof(**yyvs),
		   MYF(MY_ALLOW_ZERO_PTR | MY_FREE_ON_ERROR))) ||
      !(lex->yacc_yyss= (char*)
	my_realloc((gptr) lex->yacc_yyss,
		   *yystacksize*sizeof(**yyss),
		   MYF(MY_ALLOW_ZERO_PTR | MY_FREE_ON_ERROR))))
    return 1;
  if (old_info)
  {						// Copy old info from stack
    memcpy(lex->yacc_yyss, (gptr) *yyss, old_info*sizeof(**yyss));
    memcpy(lex->yacc_yyvs, (gptr) *yyvs, old_info*sizeof(**yyvs));
  }
  *yyss=(short*) lex->yacc_yyss;
  *yyvs=(YYSTYPE*) lex->yacc_yyvs;
  return 0;
}


/****************************************************************************
5688
  Initialize global thd variables needed for query
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5689 5690
****************************************************************************/

5691
void
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5692
mysql_init_query(THD *thd, uchar *buf, uint length)
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5693 5694
{
  DBUG_ENTER("mysql_init_query");
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5695
  lex_start(thd, buf, length);
5696 5697 5698 5699 5700 5701 5702 5703 5704 5705 5706 5707 5708 5709 5710 5711 5712 5713 5714 5715 5716
  mysql_reset_thd_for_next_command(thd);
  DBUG_VOID_RETURN;
}


/*
 Reset THD part responsible for command processing state.

 DESCRIPTION
   This needs to be called before execution of every statement
   (prepared or conventional).

 TODO
   Make it a method of THD and align its name with the rest of
   reset/end/start/init methods.
   Call it after we use THD for queries, not before.
*/

void mysql_reset_thd_for_next_command(THD *thd)
{
  DBUG_ENTER("mysql_reset_thd_for_next_command");
5717
  thd->free_list= 0;
5718
  thd->select_number= 1;
5719
  thd->query_start_used= thd->insert_id_used=0;
5720
  thd->last_insert_id_used_bin_log= FALSE;
5721
  thd->is_fatal_error= thd->time_zone_used= 0;
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5722
  thd->server_status&= ~ (SERVER_MORE_RESULTS_EXISTS | 
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5723 5724
                          SERVER_QUERY_NO_INDEX_USED |
                          SERVER_QUERY_NO_GOOD_INDEX_USED);
5725
  DBUG_ASSERT(thd->security_ctx== &thd->main_security_ctx);
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  thd->tmp_table_used= 0;
5727 5728
  if (!thd->in_sub_stmt)
  {
5729
    if (opt_bin_log)
5730
    {
5731
      reset_dynamic(&thd->user_var_events);
5732 5733
      thd->user_var_events_alloc= thd->mem_root;
    }
5734
    thd->clear_error();
5735 5736 5737 5738
    thd->total_warn_count=0;			// Warnings for this query
    thd->rand_used= 0;
    thd->sent_row_count= thd->examined_row_count= 0;
  }
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5739 5740 5741
  DBUG_VOID_RETURN;
}

5742

5743 5744 5745
void
mysql_init_select(LEX *lex)
{
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5746
  SELECT_LEX *select_lex= lex->current_select;
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5747
  select_lex->init_select();
5748
  lex->wild= 0;
5749 5750
  if (select_lex == &lex->select_lex)
  {
5751
    DBUG_ASSERT(lex->result == 0);
5752 5753
    lex->exchange= 0;
  }
5754 5755
}

5756

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5757
bool
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5758
mysql_new_select(LEX *lex, bool move_down)
5759
{
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5760
  SELECT_LEX *select_lex;
5761
  THD *thd= lex->thd;
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5762 5763
  DBUG_ENTER("mysql_new_select");

5764
  if (!(select_lex= new (thd->mem_root) SELECT_LEX()))
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5765
    DBUG_RETURN(1);
5766
  select_lex->select_number= ++thd->select_number;
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5767
  select_lex->parent_lex= lex; /* Used in init_query. */
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5768 5769
  select_lex->init_query();
  select_lex->init_select();
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5770 5771
  lex->nest_level++;
  select_lex->nest_level= lex->nest_level;
5772 5773 5774 5775 5776
  /*
    Don't evaluate this subquery during statement prepare even if
    it's a constant one. The flag is switched off in the end of
    mysql_stmt_prepare.
  */
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5777
  if (thd->stmt_arena->is_stmt_prepare())
5778
    select_lex->uncacheable|= UNCACHEABLE_PREPARE;
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5779 5780
  if (move_down)
  {
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5781
    SELECT_LEX_UNIT *unit;
5782
    lex->subqueries= TRUE;
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5783
    /* first select_lex of subselect or derived table */
5784
    if (!(unit= new (thd->mem_root) SELECT_LEX_UNIT()))
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5785
      DBUG_RETURN(1);
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5786

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5787 5788
    unit->init_query();
    unit->init_select();
5789
    unit->thd= thd;
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5790
    unit->include_down(lex->current_select);
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5791 5792
    unit->link_next= 0;
    unit->link_prev= 0;
5793
    unit->return_to= lex->current_select;
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5794
    select_lex->include_down(unit);
5795 5796 5797 5798 5799
    /*
      By default we assume that it is usual subselect and we have outer name
      resolution context, if no we will assign it to 0 later
    */
    select_lex->context.outer_context= &select_lex->outer_select()->context;
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  }
  else
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5802
  {
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5803 5804
    if (lex->current_select->order_list.first && !lex->current_select->braces)
    {
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5805
      my_error(ER_WRONG_USAGE, MYF(0), "UNION", "ORDER BY");
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5806
      DBUG_RETURN(1);
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5807
    }
5808
    select_lex->include_neighbour(lex->current_select);
5809 5810 5811 5812 5813
    SELECT_LEX_UNIT *unit= select_lex->master_unit();                              
    if (!unit->fake_select_lex && unit->add_fake_select_lex(lex->thd))
      DBUG_RETURN(1);
    select_lex->context.outer_context= 
                unit->first_select()->context.outer_context;
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5814
  }
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5815

5816
  select_lex->master_unit()->global_parameters= select_lex;
5817
  select_lex->include_global((st_select_lex_node**)&lex->all_selects_list);
5818
  lex->current_select= select_lex;
5819 5820 5821 5822 5823
  /*
    in subquery is SELECT query and we allow resolution of names in SELECT
    list
  */
  select_lex->context.resolve_in_select_list= TRUE;
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5824
  DBUG_RETURN(0);
5825
}
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5826

5827 5828 5829 5830 5831 5832 5833 5834 5835 5836 5837 5838 5839 5840 5841
/*
  Create a select to return the same output as 'SELECT @@var_name'.

  SYNOPSIS
    create_select_for_variable()
    var_name		Variable name

  DESCRIPTION
    Used for SHOW COUNT(*) [ WARNINGS | ERROR]

    This will crash with a core dump if the variable doesn't exists
*/

void create_select_for_variable(const char *var_name)
{
5842
  THD *thd;
5843
  LEX *lex;
5844
  LEX_STRING tmp, null_lex_string;
5845 5846
  Item *var;
  char buff[MAX_SYS_VAR_LENGTH*2+4+8], *end;
5847
  DBUG_ENTER("create_select_for_variable");
5848 5849

  thd= current_thd;
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5850
  lex= thd->lex;
5851 5852 5853 5854
  mysql_init_select(lex);
  lex->sql_command= SQLCOM_SELECT;
  tmp.str= (char*) var_name;
  tmp.length=strlen(var_name);
5855
  bzero((char*) &null_lex_string.str, sizeof(null_lex_string));
5856 5857 5858 5859
  /*
    We set the name of Item to @@session.var_name because that then is used
    as the column name in the output.
  */
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  if ((var= get_system_var(thd, OPT_SESSION, tmp, null_lex_string)))
  {
    end= strxmov(buff, "@@session.", var_name, NullS);
    var->set_name(buff, end-buff, system_charset_info);
    add_item_to_list(thd, var);
  }
5866 5867 5868
  DBUG_VOID_RETURN;
}

5869

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5870 5871
void mysql_init_multi_delete(LEX *lex)
{
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5872
  lex->sql_command=  SQLCOM_DELETE_MULTI;
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5873
  mysql_init_select(lex);
5874 5875
  lex->select_lex.select_limit= 0;
  lex->unit.select_limit_cnt= HA_POS_ERROR;
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  lex->select_lex.table_list.save_and_clear(&lex->auxiliary_table_list);
5877
  lex->lock_option= using_update_log ? TL_READ_NO_INSERT : TL_READ;
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  lex->query_tables= 0;
  lex->query_tables_last= &lex->query_tables;
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}
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5882 5883 5884 5885
/*
  When you modify mysql_parse(), you may need to mofify
  mysql_test_parse_for_slave() in this same file.
*/
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5886

5887
void mysql_parse(THD *thd, char *inBuf, uint length)
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5888 5889
{
  DBUG_ENTER("mysql_parse");
5890 5891 5892

  DBUG_EXECUTE_IF("parser_debug", turn_parser_debug_on(););

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5893
  mysql_init_query(thd, (uchar*) inBuf, length);
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5894
  if (query_cache_send_result_to_client(thd, inBuf, length) <= 0)
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5895
  {
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5896
    LEX *lex= thd->lex;
5897
    
5898 5899
    sp_cache_flush_obsolete(&thd->sp_proc_cache);
    sp_cache_flush_obsolete(&thd->sp_func_cache);
5900
    
5901
    if (!MYSQLparse((void *)thd) && ! thd->is_fatal_error)
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5902
    {
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5903
#ifndef NO_EMBEDDED_ACCESS_CHECKS
5904
      if (mqh_used && thd->user_connect &&
5905
	  check_mqh(thd, lex->sql_command))
5906 5907 5908 5909
      {
	thd->net.error = 0;
      }
      else
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5910
#endif
5911
      {
5912
	if (! thd->net.report_error)
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5913
	{
5914 5915 5916 5917 5918 5919 5920 5921 5922 5923
          /*
            Binlog logs a string starting from thd->query and having length
            thd->query_length; so we set thd->query_length correctly (to not
            log several statements in one event, when we executed only first).
            We set it to not see the ';' (otherwise it would get into binlog
            and Query_log_event::print() would give ';;' output).
            This also helps display only the current query in SHOW
            PROCESSLIST.
            Note that we don't need LOCK_thread_count to modify query_length.
          */
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          if (lex->found_semicolon &&
              (thd->query_length= (ulong)(lex->found_semicolon - thd->query)))
5926 5927
            thd->query_length--;
          /* Actually execute the query */
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	  mysql_execute_command(thd);
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SCRUM  
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	  query_cache_end_of_result(thd);
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	}
5931
      }
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    }
    else
5934
    {
5935
      DBUG_ASSERT(thd->net.report_error);
5936
      DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
5937
			 thd->is_fatal_error));
5938 5939

      query_cache_abort(&thd->net);
5940
    }
5941 5942 5943 5944 5945 5946
    if (thd->lex->sphead)
    {
      delete thd->lex->sphead;
      thd->lex->sphead= 0;
    }
    lex->unit.cleanup();
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    thd->proc_info="freeing items";
5948
    thd->end_statement();
5949
    thd->cleanup_after_query();
5950
    DBUG_ASSERT(thd->change_list.is_empty());
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  }
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  DBUG_VOID_RETURN;
}


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#ifdef HAVE_REPLICATION
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/*
  Usable by the replication SQL thread only: just parse a query to know if it
  can be ignored because of replicate-*-table rules.

  RETURN VALUES
    0	cannot be ignored
    1	can be ignored
*/

bool mysql_test_parse_for_slave(THD *thd, char *inBuf, uint length)
{
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  LEX *lex= thd->lex;
5969
  bool error= 0;
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  DBUG_ENTER("mysql_test_parse_for_slave");
5971

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  mysql_init_query(thd, (uchar*) inBuf, length);
5973
  if (!MYSQLparse((void*) thd) && ! thd->is_fatal_error &&
5974
      all_tables_not_ok(thd,(TABLE_LIST*) lex->select_lex.table_list.first))
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    error= 1;                  /* Ignore question */
5976
  thd->end_statement();
5977
  thd->cleanup_after_query();
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  DBUG_RETURN(error);
5979
}
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#endif
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5982

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5983

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/*****************************************************************************
** Store field definition for create
** Return 0 if ok
******************************************************************************/

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bool add_field_to_list(THD *thd, char *field_name, enum_field_types type,
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		       char *length, char *decimals,
5991
		       uint type_modifier,
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		       Item *default_value, Item *on_update_value,
                       LEX_STRING *comment,
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		       char *change,
                       List<String> *interval_list, CHARSET_INFO *cs,
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		       uint uint_geom_type)
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{
  register create_field *new_field;
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  LEX  *lex= thd->lex;
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  DBUG_ENTER("add_field_to_list");

  if (strlen(field_name) > NAME_LEN)
  {
6004
    my_error(ER_TOO_LONG_IDENT, MYF(0), field_name); /* purecov: inspected */
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    DBUG_RETURN(1);				/* purecov: inspected */
  }
  if (type_modifier & PRI_KEY_FLAG)
  {
    lex->col_list.push_back(new key_part_spec(field_name,0));
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    lex->alter_info.key_list.push_back(new Key(Key::PRIMARY, NullS,
                                               HA_KEY_ALG_UNDEF, 0,
                                               lex->col_list));
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    lex->col_list.empty();
  }
  if (type_modifier & (UNIQUE_FLAG | UNIQUE_KEY_FLAG))
  {
    lex->col_list.push_back(new key_part_spec(field_name,0));
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    lex->alter_info.key_list.push_back(new Key(Key::UNIQUE, NullS,
                                               HA_KEY_ALG_UNDEF, 0,
                                               lex->col_list));
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    lex->col_list.empty();
  }

6024
  if (default_value)
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  {
6026
    /* 
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      Default value should be literal => basic constants =>
      no need fix_fields()
6029 6030 6031
      
      We allow only one function as part of default value - 
      NOW() as default for TIMESTAMP type.
6032
    */
6033 6034 6035
    if (default_value->type() == Item::FUNC_ITEM && 
        !(((Item_func*)default_value)->functype() == Item_func::NOW_FUNC &&
         type == FIELD_TYPE_TIMESTAMP))
6036
    {
6037
      my_error(ER_INVALID_DEFAULT, MYF(0), field_name);
6038 6039 6040
      DBUG_RETURN(1);
    }
    else if (default_value->type() == Item::NULL_ITEM)
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    {
6042
      default_value= 0;
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      if ((type_modifier & (NOT_NULL_FLAG | AUTO_INCREMENT_FLAG)) ==
	  NOT_NULL_FLAG)
      {
6046
	my_error(ER_INVALID_DEFAULT, MYF(0), field_name);
6047 6048 6049 6050 6051
	DBUG_RETURN(1);
      }
    }
    else if (type_modifier & AUTO_INCREMENT_FLAG)
    {
6052
      my_error(ER_INVALID_DEFAULT, MYF(0), field_name);
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      DBUG_RETURN(1);
    }
  }
6056 6057 6058

  if (on_update_value && type != FIELD_TYPE_TIMESTAMP)
  {
6059
    my_error(ER_INVALID_ON_UPDATE, MYF(0), field_name);
6060 6061
    DBUG_RETURN(1);
  }
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  if (type == FIELD_TYPE_TIMESTAMP && length)
  {
    /* Display widths are no longer supported for TIMSTAMP as of MySQL 4.1.
       In other words, for declarations such as TIMESTAMP(2), TIMESTAMP(4),
       and so on, the display width is ignored.
    */
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    char buf[32];
6070
    my_snprintf(buf, sizeof(buf), "TIMESTAMP(%s)", length);
6071 6072 6073
    push_warning_printf(thd,MYSQL_ERROR::WARN_LEVEL_WARN,
                        ER_WARN_DEPRECATED_SYNTAX,
                        ER(ER_WARN_DEPRECATED_SYNTAX),
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                        buf, "TIMESTAMP");
6075 6076
  }

6077 6078 6079 6080
  if (!(new_field= new create_field()) ||
      new_field->init(thd, field_name, type, length, decimals, type_modifier,
                      default_value, on_update_value, comment, change,
                      interval_list, cs, uint_geom_type))
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    DBUG_RETURN(1);
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6082

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  lex->alter_info.create_list.push_back(new_field);
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  lex->last_field=new_field;
  DBUG_RETURN(0);
}

6088

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/* Store position for column in ALTER TABLE .. ADD column */

void store_position_for_column(const char *name)
{
6093
  current_thd->lex->last_field->after=my_const_cast(char*) (name);
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}

bool
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add_proc_to_list(THD* thd, Item *item)
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{
  ORDER *order;
  Item	**item_ptr;

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  if (!(order = (ORDER *) thd->alloc(sizeof(ORDER)+sizeof(Item*))))
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    return 1;
  item_ptr = (Item**) (order+1);
  *item_ptr= item;
  order->item=item_ptr;
  order->free_me=0;
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  thd->lex->proc_list.link_in_list((byte*) order,(byte**) &order->next);
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  return 0;
}


/* Fix escaping of _, % and \ in database and table names (for ODBC) */

static void remove_escape(char *name)
{
6117 6118
  if (!*name)					// For empty DB names
    return;
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  char *to;
#ifdef USE_MB
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  char *strend=name+(uint) strlen(name);
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#endif
  for (to=name; *name ; name++)
  {
#ifdef USE_MB
    int l;
6127 6128
    if (use_mb(system_charset_info) &&
        (l = my_ismbchar(system_charset_info, name, strend)))
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    {
	while (l--)
	    *to++ = *name++;
	name--;
	continue;
    }
#endif
    if (*name == '\\' && name[1])
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      name++;					// Skip '\\'
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    *to++= *name;
  }
  *to=0;
}

/****************************************************************************
** save order by and tables in own lists
****************************************************************************/


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bool add_to_list(THD *thd, SQL_LIST &list,Item *item,bool asc)
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{
  ORDER *order;
  DBUG_ENTER("add_to_list");
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  if (!(order = (ORDER *) thd->alloc(sizeof(ORDER))))
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    DBUG_RETURN(1);
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  order->item_ptr= item;
  order->item= &order->item_ptr;
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  order->asc = asc;
  order->free_me=0;
  order->used=0;
6159
  order->counter_used= 0;
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  list.link_in_list((byte*) order,(byte**) &order->next);
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  DBUG_RETURN(0);
}


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/*
  Add a table to list of used tables

  SYNOPSIS
    add_table_to_list()
    table		Table to add
    alias		alias for table (or null if no alias)
    table_options	A set of the following bits:
			TL_OPTION_UPDATING	Table will be updated
			TL_OPTION_FORCE_INDEX	Force usage of index
6175
			TL_OPTION_ALIAS	        an alias in multi table DELETE
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    lock_type		How table should be locked
    use_index		List of indexed used in USE INDEX
    ignore_index	List of indexed used in IGNORE INDEX

    RETURN
      0		Error
      #		Pointer to TABLE_LIST element added to the total table list
*/

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TABLE_LIST *st_select_lex::add_table_to_list(THD *thd,
					     Table_ident *table,
6187
					     LEX_STRING *alias,
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					     ulong table_options,
					     thr_lock_type lock_type,
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					     List<String> *use_index_arg,
					     List<String> *ignore_index_arg,
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                                             LEX_STRING *option)
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{
  register TABLE_LIST *ptr;
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  TABLE_LIST *previous_table_ref; /* The table preceding the current one. */
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  char *alias_str;
6197
  LEX *lex= thd->lex;
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  DBUG_ENTER("add_table_to_list");
6199
  LINT_INIT(previous_table_ref);
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  if (!table)
    DBUG_RETURN(0);				// End of memory
  alias_str= alias ? alias->str : table->table.str;
6204 6205
  if (!test(table_options & TL_OPTION_ALIAS) && 
      check_table_name(table->table.str, table->table.length))
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  {
6207
    my_error(ER_WRONG_TABLE_NAME, MYF(0), table->table.str);
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    DBUG_RETURN(0);
  }

  if (!alias)					/* Alias is case sensitive */
6212 6213 6214
  {
    if (table->sel)
    {
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      my_message(ER_DERIVED_MUST_HAVE_ALIAS,
                 ER(ER_DERIVED_MUST_HAVE_ALIAS), MYF(0));
6217 6218
      DBUG_RETURN(0);
    }
6219
    if (!(alias_str=thd->memdup(alias_str,table->table.length+1)))
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      DBUG_RETURN(0);
6221
  }
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  if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
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    DBUG_RETURN(0);				/* purecov: inspected */
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  if (table->db.str)
6225
  {
6226 6227 6228 6229 6230
    if (table->is_derived_table() == FALSE && check_db_name(table->db.str))
    {
      my_error(ER_WRONG_DB_NAME, MYF(0), table->db.str);
      DBUG_RETURN(0);
    }
6231 6232 6233
    ptr->db= table->db.str;
    ptr->db_length= table->db.length;
  }
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  else if (thd->copy_db_to(&ptr->db, &ptr->db_length))
    DBUG_RETURN(0);
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6237
  ptr->alias= alias_str;
6238
  if (lower_case_table_names && table->table.length)
6239
    table->table.length= my_casedn_str(files_charset_info, table->table.str);
6240 6241
  ptr->table_name=table->table.str;
  ptr->table_name_length=table->table.length;
6242
  ptr->lock_type=   lock_type;
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  ptr->updating=    test(table_options & TL_OPTION_UPDATING);
  ptr->force_index= test(table_options & TL_OPTION_FORCE_INDEX);
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  ptr->ignore_leaves= test(table_options & TL_OPTION_IGNORE_LEAVES);
6246
  ptr->derived=	    table->sel;
6247 6248
  if (!ptr->derived && !my_strcasecmp(system_charset_info, ptr->db,
                                      information_schema_name.str))
6249
  {
6250
    ST_SCHEMA_TABLE *schema_table= find_schema_table(thd, ptr->table_name);
6251 6252 6253
    if (!schema_table ||
        (schema_table->hidden && 
         lex->orig_sql_command == SQLCOM_END))  // not a 'show' command
6254
    {
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      my_error(ER_UNKNOWN_TABLE, MYF(0),
6256
               ptr->table_name, information_schema_name.str);
6257 6258
      DBUG_RETURN(0);
    }
6259
    ptr->schema_table_name= ptr->table_name;
6260 6261
    ptr->schema_table= schema_table;
  }
6262
  ptr->select_lex=  lex->current_select;
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  ptr->cacheable_table= 1;
6264 6265 6266 6267 6268 6269
  if (use_index_arg)
    ptr->use_index=(List<String> *) thd->memdup((gptr) use_index_arg,
						sizeof(*use_index_arg));
  if (ignore_index_arg)
    ptr->ignore_index=(List<String> *) thd->memdup((gptr) ignore_index_arg,
						   sizeof(*ignore_index_arg));
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  ptr->option= option ? option->str : 0;
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  /* check that used name is unique */
6272
  if (lock_type != TL_IGNORE)
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  {
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    TABLE_LIST *first_table= (TABLE_LIST*) table_list.first;
    if (lex->sql_command == SQLCOM_CREATE_VIEW)
      first_table= first_table ? first_table->next_local : NULL;
    for (TABLE_LIST *tables= first_table ;
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	 tables ;
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VIEW  
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	 tables=tables->next_local)
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    {
6281 6282
      if (!my_strcasecmp(table_alias_charset, alias_str, tables->alias) &&
	  !strcmp(ptr->db, tables->db))
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6283
      {
6284
	my_error(ER_NONUNIQ_TABLE, MYF(0), alias_str); /* purecov: tested */
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	DBUG_RETURN(0);				/* purecov: tested */
      }
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    }
  }
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  /* Store the table reference preceding the current one. */
  if (table_list.elements > 0)
  {
6292 6293 6294
    /*
      table_list.next points to the last inserted TABLE_LIST->next_local'
      element
6295
      We don't use the offsetof() macro here to avoid warnings from gcc
6296
    */
6297 6298 6299
    previous_table_ref= (TABLE_LIST*) ((char*) table_list.next -
                                       ((char*) &(ptr->next_local) -
                                        (char*) ptr));
6300 6301 6302 6303 6304 6305 6306 6307
    /*
      Set next_name_resolution_table of the previous table reference to point
      to the current table reference. In effect the list
      TABLE_LIST::next_name_resolution_table coincides with
      TABLE_LIST::next_local. Later this may be changed in
      store_top_level_join_columns() for NATURAL/USING joins.
    */
    previous_table_ref->next_name_resolution_table= ptr;
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  }
6309

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  /*
    Link the current table reference in a local list (list for current select).
    Notice that as a side effect here we set the next_local field of the
    previous table reference to 'ptr'. Here we also add one element to the
    list 'table_list'.
  */
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VIEW  
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  table_list.link_in_list((byte*) ptr, (byte**) &ptr->next_local);
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  ptr->next_name_resolution_table= NULL;
6318
  /* Link table in global list (all used tables) */
6319
  lex->add_to_query_tables(ptr);
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  DBUG_RETURN(ptr);
}

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6324 6325 6326 6327
/*
  Initialize a new table list for a nested join

  SYNOPSIS
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    init_nested_join()
6329
    thd         current thread
6330

6331 6332 6333 6334 6335 6336 6337 6338 6339 6340 6341 6342 6343 6344 6345 6346 6347 6348 6349
  DESCRIPTION
    The function initializes a structure of the TABLE_LIST type
    for a nested join. It sets up its nested join list as empty.
    The created structure is added to the front of the current
    join list in the st_select_lex object. Then the function
    changes the current nest level for joins to refer to the newly
    created empty list after having saved the info on the old level
    in the initialized structure.

  RETURN VALUE
    0,  if success
    1,  otherwise
*/

bool st_select_lex::init_nested_join(THD *thd)
{
  TABLE_LIST *ptr;
  NESTED_JOIN *nested_join;
  DBUG_ENTER("init_nested_join");
6350

6351 6352
  if (!(ptr= (TABLE_LIST*) thd->calloc(ALIGN_SIZE(sizeof(TABLE_LIST))+
                                       sizeof(NESTED_JOIN))))
6353
    DBUG_RETURN(1);
6354 6355 6356
  nested_join= ptr->nested_join=
    ((NESTED_JOIN*) ((byte*) ptr + ALIGN_SIZE(sizeof(TABLE_LIST))));

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  join_list->push_front(ptr);
  ptr->embedding= embedding;
  ptr->join_list= join_list;
  embedding= ptr;
  join_list= &nested_join->join_list;
  join_list->empty();
  DBUG_RETURN(0);
}


/*
  End a nested join table list

  SYNOPSIS
    end_nested_join()
    thd         current thread

  DESCRIPTION
    The function returns to the previous join nest level.
    If the current level contains only one member, the function
6377
    moves it one level up, eliminating the nest.
6378 6379 6380 6381 6382 6383 6384 6385 6386

  RETURN VALUE
    Pointer to TABLE_LIST element added to the total table list, if success
    0, otherwise
*/

TABLE_LIST *st_select_lex::end_nested_join(THD *thd)
{
  TABLE_LIST *ptr;
6387
  NESTED_JOIN *nested_join;
6388
  DBUG_ENTER("end_nested_join");
6389

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  DBUG_ASSERT(embedding);
6391 6392 6393
  ptr= embedding;
  join_list= ptr->join_list;
  embedding= ptr->embedding;
6394
  nested_join= ptr->nested_join;
6395 6396 6397 6398 6399 6400 6401 6402 6403
  if (nested_join->join_list.elements == 1)
  {
    TABLE_LIST *embedded= nested_join->join_list.head();
    join_list->pop();
    embedded->join_list= join_list;
    embedded->embedding= embedding;
    join_list->push_front(embedded);
    ptr= embedded;
  }
6404
  else if (nested_join->join_list.elements == 0)
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  {
    join_list->pop();
6407
    ptr= 0;                                     // return value
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  }
6409 6410 6411 6412 6413 6414 6415 6416
  DBUG_RETURN(ptr);
}


/*
  Nest last join operation

  SYNOPSIS
6417
    nest_last_join()
6418 6419 6420 6421 6422 6423
    thd         current thread

  DESCRIPTION
    The function nest last join operation as if it was enclosed in braces.

  RETURN VALUE
6424 6425 6426
    0  Error
    #  Pointer to TABLE_LIST element created for the new nested join

6427 6428 6429 6430 6431 6432
*/

TABLE_LIST *st_select_lex::nest_last_join(THD *thd)
{
  TABLE_LIST *ptr;
  NESTED_JOIN *nested_join;
6433
  List<TABLE_LIST> *embedded_list;
6434
  DBUG_ENTER("nest_last_join");
6435

6436 6437
  if (!(ptr= (TABLE_LIST*) thd->calloc(ALIGN_SIZE(sizeof(TABLE_LIST))+
                                       sizeof(NESTED_JOIN))))
6438
    DBUG_RETURN(0);
6439 6440 6441
  nested_join= ptr->nested_join=
    ((NESTED_JOIN*) ((byte*) ptr + ALIGN_SIZE(sizeof(TABLE_LIST))));

6442 6443
  ptr->embedding= embedding;
  ptr->join_list= join_list;
6444
  embedded_list= &nested_join->join_list;
6445
  embedded_list->empty();
6446 6447

  for (uint i=0; i < 2; i++)
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  {
    TABLE_LIST *table= join_list->pop();
    table->join_list= embedded_list;
    table->embedding= ptr;
    embedded_list->push_back(table);
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    if (table->natural_join)
    {
      ptr->is_natural_join= TRUE;
      /*
        If this is a JOIN ... USING, move the list of joined fields to the
        table reference that describes the join.
      */
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      if (prev_join_using)
        ptr->join_using_fields= prev_join_using;
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    }
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  }
  join_list->push_front(ptr);
  nested_join->used_tables= nested_join->not_null_tables= (table_map) 0;
  DBUG_RETURN(ptr);
}


/*
  Add a table to the current join list

  SYNOPSIS
    add_joined_table()
    table       the table to add

  DESCRIPTION
    The function puts a table in front of the current join list
    of st_select_lex object.
    Thus, joined tables are put into this list in the reverse order
    (the most outer join operation follows first).

  RETURN VALUE
    None
*/

void st_select_lex::add_joined_table(TABLE_LIST *table)
{
  DBUG_ENTER("add_joined_table");
  join_list->push_front(table);
  table->join_list= join_list;
  table->embedding= embedding;
  DBUG_VOID_RETURN;
}


/*
  Convert a right join into equivalent left join

  SYNOPSIS
    convert_right_join()
    thd         current thread
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  DESCRIPTION
    The function takes the current join list t[0],t[1] ... and
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    effectively converts it into the list t[1],t[0] ...
    Although the outer_join flag for the new nested table contains
    JOIN_TYPE_RIGHT, it will be handled as the inner table of a left join
    operation.

  EXAMPLES
    SELECT * FROM t1 RIGHT JOIN t2 ON on_expr =>
      SELECT * FROM t2 LEFT JOIN t1 ON on_expr

    SELECT * FROM t1,t2 RIGHT JOIN t3 ON on_expr =>
      SELECT * FROM t1,t3 LEFT JOIN t2 ON on_expr

    SELECT * FROM t1,t2 RIGHT JOIN (t3,t4) ON on_expr =>
      SELECT * FROM t1,(t3,t4) LEFT JOIN t2 ON on_expr

    SELECT * FROM t1 LEFT JOIN t2 ON on_expr1 RIGHT JOIN t3  ON on_expr2 =>
      SELECT * FROM t3 LEFT JOIN (t1 LEFT JOIN t2 ON on_expr2) ON on_expr1

  RETURN
    Pointer to the table representing the inner table, if success
    0, otherwise
*/

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TABLE_LIST *st_select_lex::convert_right_join()
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{
  TABLE_LIST *tab2= join_list->pop();
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  TABLE_LIST *tab1= join_list->pop();
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  DBUG_ENTER("convert_right_join");

  join_list->push_front(tab2);
  join_list->push_front(tab1);
  tab1->outer_join|= JOIN_TYPE_RIGHT;

  DBUG_RETURN(tab1);
}

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/*
  Set lock for all tables in current select level

  SYNOPSIS:
    set_lock_for_tables()
    lock_type			Lock to set for tables

  NOTE:
    If lock is a write lock, then tables->updating is set 1
    This is to get tables_ok to know that the table is updated by the
    query
*/

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void st_select_lex::set_lock_for_tables(thr_lock_type lock_type)
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{
  bool for_update= lock_type >= TL_READ_NO_INSERT;
  DBUG_ENTER("set_lock_for_tables");
  DBUG_PRINT("enter", ("lock_type: %d  for_update: %d", lock_type,
		       for_update));

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  for (TABLE_LIST *tables= (TABLE_LIST*) table_list.first;
       tables;
       tables= tables->next_local)
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  {
    tables->lock_type= lock_type;
    tables->updating=  for_update;
  }
  DBUG_VOID_RETURN;
}

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/*
  Create a fake SELECT_LEX for a unit

  SYNOPSIS:
    add_fake_select_lex()
    thd			   thread handle

  DESCRIPTION
    The method create a fake SELECT_LEX object for a unit.
    This object is created for any union construct containing a union
    operation and also for any single select union construct of the form
    (SELECT ... ORDER BY order_list [LIMIT n]) ORDER BY ... 
    or of the form
    (SELECT ... ORDER BY LIMIT n) ORDER BY ...
  
  NOTES
    The object is used to retrieve rows from the temporary table
    where the result on the union is obtained.

  RETURN VALUES
    1     on failure to create the object
    0     on success
*/

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bool st_select_lex_unit::add_fake_select_lex(THD *thd_arg)
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{
  SELECT_LEX *first_sl= first_select();
  DBUG_ENTER("add_fake_select_lex");
  DBUG_ASSERT(!fake_select_lex);
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  if (!(fake_select_lex= new (thd_arg->mem_root) SELECT_LEX()))
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      DBUG_RETURN(1);
  fake_select_lex->include_standalone(this, 
                                      (SELECT_LEX_NODE**)&fake_select_lex);
  fake_select_lex->select_number= INT_MAX;
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  fake_select_lex->parent_lex= thd_arg->lex; /* Used in init_query. */
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  fake_select_lex->make_empty_select();
  fake_select_lex->linkage= GLOBAL_OPTIONS_TYPE;
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  fake_select_lex->select_limit= 0;

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  fake_select_lex->context.outer_context=first_sl->context.outer_context;
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  /* allow item list resolving in fake select for ORDER BY */
  fake_select_lex->context.resolve_in_select_list= TRUE;
  fake_select_lex->context.select_lex= fake_select_lex;
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  if (!first_sl->next_select())
  {
    /* 
      This works only for 
      (SELECT ... ORDER BY list [LIMIT n]) ORDER BY order_list [LIMIT m],
      (SELECT ... LIMIT n) ORDER BY order_list [LIMIT m]
      just before the parser starts processing order_list
    */ 
    global_parameters= fake_select_lex;
    fake_select_lex->no_table_names_allowed= 1;
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    thd_arg->lex->current_select= fake_select_lex;
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  }
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  thd_arg->lex->pop_context();
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  DBUG_RETURN(0);
}

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/*
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  Push a new name resolution context for a JOIN ... ON clause to the
  context stack of a query block.
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  SYNOPSIS
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    push_new_name_resolution_context()
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    thd       pointer to current thread
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    left_op   left  operand of the JOIN
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    right_op  rigth operand of the JOIN

  DESCRIPTION
    Create a new name resolution context for a JOIN ... ON clause,
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    set the first and last leaves of the list of table references
    to be used for name resolution, and push the newly created
    context to the stack of contexts of the query.
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  RETURN
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    FALSE  if all is OK
    TRUE   if a memory allocation error occured
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*/

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bool
push_new_name_resolution_context(THD *thd,
                                 TABLE_LIST *left_op, TABLE_LIST *right_op)
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{
  Name_resolution_context *on_context;
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  if (!(on_context= new (thd->mem_root) Name_resolution_context))
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    return TRUE;
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  on_context->init();
  on_context->first_name_resolution_table=
    left_op->first_leaf_for_name_resolution();
  on_context->last_name_resolution_table=
    right_op->last_leaf_for_name_resolution();
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  return thd->lex->push_context(on_context);
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}


/*
  Add an ON condition to the second operand of a JOIN ... ON.

  SYNOPSIS
    add_join_on
    b     the second operand of a JOIN ... ON
    expr  the condition to be added to the ON clause

  DESCRIPTION
    Add an ON condition to the right operand of a JOIN ... ON clause.

  RETURN
    FALSE  if there was some error
    TRUE   if all is OK
*/

void add_join_on(TABLE_LIST *b, Item *expr)
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{
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  if (expr)
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  {
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    if (!b->on_expr)
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      b->on_expr= expr;
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    else
    {
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      /*
        If called from the parser, this happens if you have both a
        right and left join. If called later, it happens if we add more
        than one condition to the ON clause.
      */
      b->on_expr= new Item_cond_and(b->on_expr,expr);
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    }
    b->on_expr->top_level_item();
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  }
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}


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/*
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  Mark that there is a NATURAL JOIN or JOIN ... USING between two
  tables.
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  SYNOPSIS
    add_join_natural()
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    a			Left join argument
    b			Right join argument
    using_fields        Field names from USING clause
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    lex                 The current st_select_lex
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  IMPLEMENTATION
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    This function marks that table b should be joined with a either via
    a NATURAL JOIN or via JOIN ... USING. Both join types are special
    cases of each other, so we treat them together. The function
    setup_conds() creates a list of equal condition between all fields
    of the same name for NATURAL JOIN or the fields in 'using_fields'
    for JOIN ... USING. The list of equality conditions is stored
    either in b->on_expr, or in JOIN::conds, depending on whether there
    was an outer join.

  EXAMPLE
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    SELECT * FROM t1 NATURAL LEFT JOIN t2
     <=>
    SELECT * FROM t1 LEFT JOIN t2 ON (t1.i=t2.i and t1.j=t2.j ... )
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    SELECT * FROM t1 NATURAL JOIN t2 WHERE <some_cond>
     <=>
    SELECT * FROM t1, t2 WHERE (t1.i=t2.i and t1.j=t2.j and <some_cond>)

    SELECT * FROM t1 JOIN t2 USING(j) WHERE <some_cond>
     <=>
    SELECT * FROM t1, t2 WHERE (t1.j=t2.j and <some_cond>)

  RETURN
    None
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*/

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void add_join_natural(TABLE_LIST *a, TABLE_LIST *b, List<String> *using_fields,
                      SELECT_LEX *lex)
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{
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  b->natural_join= a;
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  lex->prev_join_using= using_fields;
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}

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/*
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  Reload/resets privileges and the different caches.

  SYNOPSIS
    reload_acl_and_cache()
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    thd			Thread handler (can be NULL!)
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    options             What should be reset/reloaded (tables, privileges,
    slave...)
    tables              Tables to flush (if any)
    write_to_binlog     Depending on 'options', it may be very bad to write the
                        query to the binlog (e.g. FLUSH SLAVE); this is a
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                        pointer where reload_acl_and_cache() will put 0 if
                        it thinks we really should not write to the binlog.
                        Otherwise it will put 1.
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  RETURN
    0	 ok
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    !=0  error.  thd->killed or thd->net.report_error is set
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*/

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bool reload_acl_and_cache(THD *thd, ulong options, TABLE_LIST *tables,
                          bool *write_to_binlog)
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{
  bool result=0;
  select_errors=0;				/* Write if more errors */
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  bool tmp_write_to_binlog= 1;
6780

6781
  DBUG_ASSERT(!thd || !thd->in_sub_stmt);
6782

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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  if (options & REFRESH_GRANT)
  {
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    THD *tmp_thd= 0;
    /*
      If reload_acl_and_cache() is called from SIGHUP handler we have to
      allocate temporary THD for execution of acl_reload()/grant_reload().
    */
    if (!thd && (thd= (tmp_thd= new THD)))
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    {
      thd->thread_stack= (char*) &tmp_thd;
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      thd->store_globals();
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    }
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    if (thd)
    {
      (void)acl_reload(thd);
      (void)grant_reload(thd);
    }
    if (tmp_thd)
    {
      delete tmp_thd;
      /* Remember that we don't have a THD */
      my_pthread_setspecific_ptr(THR_THD,  0);
      thd= 0;
    }
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    reset_mqh((LEX_USER *)NULL, TRUE);
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  }
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#endif
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  if (options & REFRESH_LOG)
  {
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    /*
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      Flush the normal query log, the update log, the binary log,
      the slow query log, and the relay log (if it exists).
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    */
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    /*
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      Writing this command to the binlog may result in infinite loops
      when doing mysqlbinlog|mysql, and anyway it does not really make
      sense to log it automatically (would cause more trouble to users
      than it would help them)
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    */
    tmp_write_to_binlog= 0;
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    mysql_log.new_file(1);
    mysql_slow_log.new_file(1);
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    if( mysql_bin_log.is_open() )
    {
      mysql_bin_log.rotate_and_purge(RP_FORCE_ROTATE);
    }
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#ifdef HAVE_REPLICATION
6832
    pthread_mutex_lock(&LOCK_active_mi);
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    rotate_relay_log(active_mi);
6834
    pthread_mutex_unlock(&LOCK_active_mi);
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#endif
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    if (ha_flush_logs())
      result=1;
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    if (flush_error_log())
      result=1;
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  }
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#ifdef HAVE_QUERY_CACHE
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  if (options & REFRESH_QUERY_CACHE_FREE)
  {
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    query_cache.pack();				// FLUSH QUERY CACHE
6845
    options &= ~REFRESH_QUERY_CACHE;    // Don't flush cache, just free memory
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  }
  if (options & (REFRESH_TABLES | REFRESH_QUERY_CACHE))
  {
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    query_cache.flush();			// RESET QUERY CACHE
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  }
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#endif /*HAVE_QUERY_CACHE*/
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  /*
    Note that if REFRESH_READ_LOCK bit is set then REFRESH_TABLES is set too
    (see sql_yacc.yy)
  */
  if (options & (REFRESH_TABLES | REFRESH_READ_LOCK)) 
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  {
6858
    if ((options & REFRESH_READ_LOCK) && thd)
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    {
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      /*
        We must not try to aspire a global read lock if we have a write
        locked table. This would lead to a deadlock when trying to
        reopen (and re-lock) the table after the flush.
      */
      if (thd->locked_tables)
      {
        THR_LOCK_DATA **lock_p= thd->locked_tables->locks;
        THR_LOCK_DATA **end_p= lock_p + thd->locked_tables->lock_count;

        for (; lock_p < end_p; lock_p++)
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        {
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          if ((*lock_p)->type == TL_WRITE)
          {
            my_error(ER_LOCK_OR_ACTIVE_TRANSACTION, MYF(0));
            return 1;
          }
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        }
6878
      }
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      /*
	Writing to the binlog could cause deadlocks, as we don't log
	UNLOCK TABLES
      */
6883
      tmp_write_to_binlog= 0;
6884
      if (lock_global_read_lock(thd))
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	return 1;                               // Killed
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      result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1,
                                 tables);
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      if (make_global_read_lock_block_commit(thd)) // Killed
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      {
        /* Don't leave things in a half-locked state */
        unlock_global_read_lock(thd);
        return 1;
      }
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    }
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    else
      result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1, tables);
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    my_dbopt_cleanup();
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  }
  if (options & REFRESH_HOSTS)
    hostname_cache_refresh();
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  if (thd && (options & REFRESH_STATUS))
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    refresh_status(thd);
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  if (options & REFRESH_THREADS)
    flush_thread_cache();
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#ifdef HAVE_REPLICATION
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  if (options & REFRESH_MASTER)
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  {
6908
    DBUG_ASSERT(thd);
6909
    tmp_write_to_binlog= 0;
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    if (reset_master(thd))
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    {
6912
      result=1;
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      thd->fatal_error();                       // Ensure client get error
    }
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  }
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#endif
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#ifdef OPENSSL
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   if (options & REFRESH_DES_KEY_FILE)
   {
     if (des_key_file)
       result=load_des_key_file(des_key_file);
   }
#endif
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#ifdef HAVE_REPLICATION
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 if (options & REFRESH_SLAVE)
 {
6927
   tmp_write_to_binlog= 0;
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   pthread_mutex_lock(&LOCK_active_mi);
6929
   if (reset_slave(thd, active_mi))
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     result=1;
6931
   pthread_mutex_unlock(&LOCK_active_mi);
6932
 }
6933
#endif
6934
 if (options & REFRESH_USER_RESOURCES)
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   reset_mqh((LEX_USER *) NULL);
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 *write_to_binlog= tmp_write_to_binlog;
6937
 return result;
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}

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/*
  kill on thread

  SYNOPSIS
    kill_one_thread()
    thd			Thread class
    id			Thread id

  NOTES
    This is written such that we have a short lock on LOCK_thread_count
*/

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void kill_one_thread(THD *thd, ulong id, bool only_kill_query)
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{
  THD *tmp;
  uint error=ER_NO_SUCH_THREAD;
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  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For unlink from list
  I_List_iterator<THD> it(threads);
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  while ((tmp=it++))
  {
    if (tmp->thread_id == id)
    {
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      pthread_mutex_lock(&tmp->LOCK_delete);	// Lock from delete
      break;
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    }
  }
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
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  if (tmp)
  {
6969 6970
    if ((thd->security_ctx->master_access & SUPER_ACL) ||
	!strcmp(thd->security_ctx->user, tmp->security_ctx->user))
6971
    {
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      tmp->awake(only_kill_query ? THD::KILL_QUERY : THD::KILL_CONNECTION);
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      error=0;
    }
    else
      error=ER_KILL_DENIED_ERROR;
    pthread_mutex_unlock(&tmp->LOCK_delete);
  }

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  if (!error)
6981
    send_ok(thd);
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  else
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    my_error(error, MYF(0), id);
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}

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	/* If pointer is not a null pointer, append filename to it */

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static bool append_file_to_dir(THD *thd, const char **filename_ptr,
			       const char *table_name)
6991
{
6992
  char buff[FN_REFLEN],*ptr, *end;
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  if (!*filename_ptr)
    return 0;					// nothing to do

  /* Check that the filename is not too long and it's a hard path */
  if (strlen(*filename_ptr)+strlen(table_name) >= FN_REFLEN-1 ||
      !test_if_hard_path(*filename_ptr))
  {
7000
    my_error(ER_WRONG_TABLE_NAME, MYF(0), *filename_ptr);
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    return 1;
  }
  /* Fix is using unix filename format on dos */
  strmov(buff,*filename_ptr);
7005
  end=convert_dirname(buff, *filename_ptr, NullS);
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  if (!(ptr=thd->alloc((uint) (end-buff)+(uint) strlen(table_name)+1)))
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    return 1;					// End of memory
  *filename_ptr=ptr;
7009
  strxmov(ptr,buff,table_name,NullS);
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  return 0;
}
7012

7013

7014 7015 7016 7017 7018 7019 7020 7021 7022 7023 7024 7025 7026 7027
/*
  Check if the select is a simple select (not an union)

  SYNOPSIS
    check_simple_select()

  RETURN VALUES
    0	ok
    1	error	; In this case the error messege is sent to the client
*/

bool check_simple_select()
{
  THD *thd= current_thd;
7028 7029
  LEX *lex= thd->lex;
  if (lex->current_select != &lex->select_lex)
7030 7031
  {
    char command[80];
7032 7033
    strmake(command, lex->yylval->symbol.str,
	    min(lex->yylval->symbol.length, sizeof(command)-1));
7034
    my_error(ER_CANT_USE_OPTION_HERE, MYF(0), command);
7035 7036 7037 7038
    return 1;
  }
  return 0;
}
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Comp_creator *comp_eq_creator(bool invert)
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{
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  return invert?(Comp_creator *)&ne_creator:(Comp_creator *)&eq_creator;
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}

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Comp_creator *comp_ge_creator(bool invert)
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{
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  return invert?(Comp_creator *)&lt_creator:(Comp_creator *)&ge_creator;
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}

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Comp_creator *comp_gt_creator(bool invert)
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{
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  return invert?(Comp_creator *)&le_creator:(Comp_creator *)&gt_creator;
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}

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7058

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Comp_creator *comp_le_creator(bool invert)
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{
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  return invert?(Comp_creator *)&gt_creator:(Comp_creator *)&le_creator;
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}

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Comp_creator *comp_lt_creator(bool invert)
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{
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  return invert?(Comp_creator *)&ge_creator:(Comp_creator *)&lt_creator;
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}

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Comp_creator *comp_ne_creator(bool invert)
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{
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  return invert?(Comp_creator *)&eq_creator:(Comp_creator *)&ne_creator;
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}
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/*
  Construct ALL/ANY/SOME subquery Item

  SYNOPSIS
    all_any_subquery_creator()
    left_expr - pointer to left expression
    cmp - compare function creator
    all - true if we create ALL subquery
    select_lex - pointer on parsed subquery structure

  RETURN VALUE
    constructed Item (or 0 if out of memory)
*/
Item * all_any_subquery_creator(Item *left_expr,
				chooser_compare_func_creator cmp,
				bool all,
				SELECT_LEX *select_lex)
{
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  if ((cmp == &comp_eq_creator) && !all)       //  = ANY <=> IN
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    return new Item_in_subselect(left_expr, select_lex);
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  if ((cmp == &comp_ne_creator) && all)        // <> ALL <=> NOT IN
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    return new Item_func_not(new Item_in_subselect(left_expr, select_lex));

  Item_allany_subselect *it=
7102
    new Item_allany_subselect(left_expr, cmp, select_lex, all);
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7103
  if (all)
7104
    return it->upper_item= new Item_func_not_all(it);	/* ALL */
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7106
  return it->upper_item= new Item_func_nop_all(it);      /* ANY/SOME */
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}
7108 7109 7110 7111 7112 7113 7114


/*
  Multi update query pre-check

  SYNOPSIS
    multi_update_precheck()
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7115
    thd		Thread handler
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VIEW  
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    tables	Global/local table list (have to be the same)
7117

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  RETURN VALUE
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    FALSE OK
    TRUE  Error
7121
*/
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bool multi_update_precheck(THD *thd, TABLE_LIST *tables)
7124 7125 7126 7127 7128
{
  const char *msg= 0;
  TABLE_LIST *table;
  LEX *lex= thd->lex;
  SELECT_LEX *select_lex= &lex->select_lex;
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VIEW  
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  DBUG_ENTER("multi_update_precheck");
7130 7131 7132

  if (select_lex->item_list.elements != lex->value_list.elements)
  {
7133
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
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    DBUG_RETURN(TRUE);
7135 7136 7137 7138 7139
  }
  /*
    Ensure that we have UPDATE or SELECT privilege for each table
    The exact privilege is checked in mysql_multi_update()
  */
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VIEW  
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7140
  for (table= tables; table; table= table->next_local)
7141
  {
7142 7143 7144
    if (table->derived)
      table->grant.privilege= SELECT_ACL;
    else if ((check_access(thd, UPDATE_ACL, table->db,
7145 7146
                           &table->grant.privilege, 0, 1,
                           test(table->schema_table)) ||
7147 7148
              grant_option &&
              check_grant(thd, UPDATE_ACL, table, 0, 1, 1)) &&
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             (check_access(thd, SELECT_ACL, table->db,
7150 7151
                           &table->grant.privilege, 0, 0,
                           test(table->schema_table)) ||
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              grant_option && check_grant(thd, SELECT_ACL, table, 0, 1, 0)))
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      DBUG_RETURN(TRUE);
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VIEW  
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7155
    table->table_in_first_from_clause= 1;
7156
  }
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  /*
    Is there tables of subqueries?
  */
7160
  if (&lex->select_lex != lex->all_selects_list || lex->time_zone_tables_used)
7161
  {
7162
    DBUG_PRINT("info",("Checking sub query list"));
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VIEW  
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7163
    for (table= tables; table; table= table->next_global)
7164
    {
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      if (!my_tz_check_n_skip_implicit_tables(&table,
                                              lex->time_zone_tables_used) &&
          !table->table_in_first_from_clause)
7168 7169
      {
	if (check_access(thd, SELECT_ACL, table->db,
7170 7171
			 &table->grant.privilege, 0, 0,
                         test(table->schema_table)) ||
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	    grant_option && check_grant(thd, SELECT_ACL, table, 0, 1, 0))
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	  DBUG_RETURN(TRUE);
7174 7175 7176 7177 7178 7179
      }
    }
  }

  if (select_lex->order_list.elements)
    msg= "ORDER BY";
7180
  else if (select_lex->select_limit)
7181 7182 7183 7184
    msg= "LIMIT";
  if (msg)
  {
    my_error(ER_WRONG_USAGE, MYF(0), "UPDATE", msg);
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    DBUG_RETURN(TRUE);
7186
  }
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  DBUG_RETURN(FALSE);
7188 7189 7190 7191 7192 7193 7194
}

/*
  Multi delete query pre-check

  SYNOPSIS
    multi_delete_precheck()
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    thd			Thread handler
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VIEW  
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    tables		Global/local table list
7197

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  RETURN VALUE
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    FALSE OK
    TRUE  error
7201
*/
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7203
bool multi_delete_precheck(THD *thd, TABLE_LIST *tables)
7204 7205 7206
{
  SELECT_LEX *select_lex= &thd->lex->select_lex;
  TABLE_LIST *aux_tables=
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    (TABLE_LIST *)thd->lex->auxiliary_table_list.first;
7208
  TABLE_LIST **save_query_tables_own_last= thd->lex->query_tables_own_last;
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VIEW  
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7209
  DBUG_ENTER("multi_delete_precheck");
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7210

7211 7212 7213
  /* sql_yacc guarantees that tables and aux_tables are not zero */
  DBUG_ASSERT(aux_tables != 0);
  if (check_db_used(thd, tables) || check_db_used(thd,aux_tables) ||
7214 7215 7216 7217 7218 7219 7220 7221 7222 7223 7224 7225
      check_table_access(thd, SELECT_ACL, tables, 0))
    DBUG_RETURN(TRUE);

  /*
    Since aux_tables list is not part of LEX::query_tables list we
    have to juggle with LEX::query_tables_own_last value to be able
    call check_table_access() safely.
  */
  thd->lex->query_tables_own_last= 0;
  if (check_table_access(thd, DELETE_ACL, aux_tables, 0))
  {
    thd->lex->query_tables_own_last= save_query_tables_own_last;
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    DBUG_RETURN(TRUE);
7227 7228 7229
  }
  thd->lex->query_tables_own_last= save_query_tables_own_last;

7230 7231
  if ((thd->options & OPTION_SAFE_UPDATES) && !select_lex->where)
  {
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    my_message(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE,
               ER(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE), MYF(0));
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    DBUG_RETURN(TRUE);
7235
  }
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  DBUG_RETURN(FALSE);
}


/*
  Link tables in auxilary table list of multi-delete with corresponding
  elements in main table list, and set proper locks for them.

  SYNOPSIS
    multi_delete_set_locks_and_link_aux_tables()
      lex - pointer to LEX representing multi-delete

  RETURN VALUE
    FALSE - success
    TRUE  - error
*/

bool multi_delete_set_locks_and_link_aux_tables(LEX *lex)
{
  TABLE_LIST *tables= (TABLE_LIST*)lex->select_lex.table_list.first;
  TABLE_LIST *target_tbl;
  DBUG_ENTER("multi_delete_set_locks_and_link_aux_tables");

  lex->table_count= 0;

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  for (target_tbl= (TABLE_LIST *)lex->auxiliary_table_list.first;
7262
       target_tbl; target_tbl= target_tbl->next_local)
7263
  {
7264
    lex->table_count++;
7265 7266
    /* All tables in aux_tables must be found in FROM PART */
    TABLE_LIST *walk;
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VIEW  
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    for (walk= tables; walk; walk= walk->next_local)
7268
    {
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      if (!my_strcasecmp(table_alias_charset,
			 target_tbl->alias, walk->alias) &&
	  !strcmp(walk->db, target_tbl->db))
7272 7273 7274 7275
	break;
    }
    if (!walk)
    {
7276
      my_error(ER_UNKNOWN_TABLE, MYF(0),
7277
               target_tbl->table_name, "MULTI DELETE");
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      DBUG_RETURN(TRUE);
7279
    }
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    if (!walk->derived)
    {
      target_tbl->table_name= walk->table_name;
      target_tbl->table_name_length= walk->table_name_length;
    }
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    walk->updating= target_tbl->updating;
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    walk->lock_type= target_tbl->lock_type;
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VIEW  
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    target_tbl->correspondent_table= walk;	// Remember corresponding table
7288
  }
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  DBUG_RETURN(FALSE);
7290 7291 7292
}


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/*
  simple UPDATE query pre-check

  SYNOPSIS
    update_precheck()
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    thd		Thread handler
    tables	Global table list
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  RETURN VALUE
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    FALSE OK
    TRUE  Error
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*/
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7305

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bool update_precheck(THD *thd, TABLE_LIST *tables)
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{
  DBUG_ENTER("update_precheck");
  if (thd->lex->select_lex.item_list.elements != thd->lex->value_list.elements)
  {
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    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
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    DBUG_RETURN(TRUE);
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  }
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  DBUG_RETURN(check_db_used(thd, tables) ||
	       check_one_table_access(thd, UPDATE_ACL, tables));
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}


/*
  simple DELETE query pre-check

  SYNOPSIS
    delete_precheck()
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    thd		Thread handler
    tables	Global table list
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7326 7327

  RETURN VALUE
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    FALSE  OK
    TRUE   error
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*/
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7331

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bool delete_precheck(THD *thd, TABLE_LIST *tables)
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{
  DBUG_ENTER("delete_precheck");
  if (check_one_table_access(thd, DELETE_ACL, tables))
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    DBUG_RETURN(TRUE);
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7337
  /* Set privilege for the WHERE clause */
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  tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
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7339
  DBUG_RETURN(FALSE);
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}


/*
  simple INSERT query pre-check

  SYNOPSIS
    insert_precheck()
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7348 7349
    thd		Thread handler
    tables	Global table list
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7350 7351

  RETURN VALUE
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7352 7353
    FALSE  OK
    TRUE   error
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7354
*/
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7355

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merge  
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7356
bool insert_precheck(THD *thd, TABLE_LIST *tables)
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{
  LEX *lex= thd->lex;
  DBUG_ENTER("insert_precheck");

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  /*
    Check that we have modify privileges for the first table and
    select privileges for the rest
  */
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  ulong privilege= (INSERT_ACL |
                    (lex->duplicates == DUP_REPLACE ? DELETE_ACL : 0) |
                    (lex->value_list.elements ? UPDATE_ACL : 0));
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  if (check_one_table_access(thd, privilege, tables))
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    DBUG_RETURN(TRUE);
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7371

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7372
  if (lex->update_list.elements != lex->value_list.elements)
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7373
  {
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    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
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7375
    DBUG_RETURN(TRUE);
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7376
  }
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7377 7378
  if (check_db_used(thd, tables))
    DBUG_RETURN(TRUE);
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  DBUG_RETURN(FALSE);
7380
}
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7381 7382 7383 7384 7385 7386 7387


/*
  CREATE TABLE query pre-check

  SYNOPSIS
    create_table_precheck()
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7388 7389 7390
    thd			Thread handler
    tables		Global table list
    create_table	Table which will be created
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7391 7392

  RETURN VALUE
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    FALSE   OK
    TRUE   Error
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*/
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7396

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bool create_table_precheck(THD *thd, TABLE_LIST *tables,
                           TABLE_LIST *create_table)
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7399 7400
{
  LEX *lex= thd->lex;
7401 7402
  SELECT_LEX *select_lex= &lex->select_lex;
  ulong want_priv;
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merge  
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7403
  bool error= TRUE;                                 // Error message is given
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  DBUG_ENTER("create_table_precheck");
7405 7406 7407

  want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
              CREATE_TMP_ACL : CREATE_ACL);
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  if (check_access(thd, want_priv, create_table->db,
7409 7410
		   &create_table->grant.privilege, 0, 0,
                   test(create_table->schema_table)) ||
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      check_merge_table_access(thd, create_table->db,
			       (TABLE_LIST *)
			       lex->create_info.merge_list.first))
7414 7415
    goto err;
  if (grant_option && want_priv != CREATE_TMP_ACL &&
7416
      check_grant(thd, want_priv, create_table, 0, 1, 0))
7417 7418 7419 7420 7421 7422
    goto err;

  if (select_lex->item_list.elements)
  {
    /* Check permissions for used tables in CREATE TABLE ... SELECT */

7423 7424
#ifdef NOT_NECESSARY_TO_CHECK_CREATE_TABLE_EXIST_WHEN_PREPARING_STATEMENT
    /* This code throws an ill error for CREATE TABLE t1 SELECT * FROM t1 */
7425
    /*
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7426 7427 7428
      Only do the check for PS, becasue we on execute we have to check that
      against the opened tables to ensure we don't use a table that is part
      of the view (which can only be done after the table has been opened).
7429
    */
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    if (thd->stmt_arena->is_stmt_prepare_or_first_sp_execute())
7431
    {
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      /*
        For temporary tables we don't have to check if the created table exists
      */
      if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
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          find_table_in_global_list(tables, create_table->db,
7437
                                    create_table->table_name))
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7438
      {
7439
	error= FALSE;
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7440 7441 7442
        goto err;
      }
    }
7443
#endif
7444 7445 7446
    if (tables && check_table_access(thd, SELECT_ACL, tables,0))
      goto err;
  }
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merge  
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7447
  error= FALSE;
7448 7449 7450

err:
  DBUG_RETURN(error);
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7451
}
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7452 7453 7454 7455 7456 7457 7458


/*
  negate given expression

  SYNOPSIS
    negate_expression()
7459
    thd  thread handler
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    expr expression for negation

  RETURN
    negated expression
*/

Item *negate_expression(THD *thd, Item *expr)
{
  Item *negated;
  if (expr->type() == Item::FUNC_ITEM &&
      ((Item_func *) expr)->functype() == Item_func::NOT_FUNC)
  {
    /* it is NOT(NOT( ... )) */
    Item *arg= ((Item_func *) expr)->arguments()[0];
    enum_parsing_place place= thd->lex->current_select->parsing_place;
    if (arg->is_bool_func() || place == IN_WHERE || place == IN_HAVING)
      return arg;
    /*
      if it is not boolean function then we have to emulate value of
      not(not(a)), it will be a != 0
    */
    return new Item_func_ne(arg, new Item_int((char*) "0", 0, 1));
  }

  if ((negated= expr->neg_transformer(thd)) != 0)
    return negated;
  return new Item_func_not(expr);
}
7488

7489 7490
/*
  Set the specified definer to the default value, which is the current user in
7491
  the thread.
7492 7493 7494 7495 7496 7497 7498
 
  SYNOPSIS
    get_default_definer()
    thd       [in] thread handler
    definer   [out] definer
*/
 
7499
void get_default_definer(THD *thd, LEX_USER *definer)
7500 7501 7502 7503 7504 7505 7506 7507 7508 7509
{
  const Security_context *sctx= thd->security_ctx;

  definer->user.str= (char *) sctx->priv_user;
  definer->user.length= strlen(definer->user.str);

  definer->host.str= (char *) sctx->priv_host;
  definer->host.length= strlen(definer->host.str);
}

7510

7511
/*
7512
  Create default definer for the specified THD.
7513 7514 7515 7516 7517 7518 7519 7520 7521 7522 7523 7524 7525 7526 7527 7528 7529 7530

  SYNOPSIS
    create_default_definer()
    thd         [in] thread handler

  RETURN
    On success, return a valid pointer to the created and initialized
    LEX_USER, which contains definer information.
    On error, return 0.
*/

LEX_USER *create_default_definer(THD *thd)
{
  LEX_USER *definer;

  if (! (definer= (LEX_USER*) thd->alloc(sizeof(LEX_USER))))
    return 0;

7531
  get_default_definer(thd, definer);
7532 7533 7534 7535 7536

  return definer;
}


7537
/*
7538
  Create definer with the given user and host names.
7539 7540

  SYNOPSIS
7541 7542 7543 7544
    create_definer()
    thd         [in] thread handler
    user_name   [in] user name
    host_name   [in] host name
7545 7546

  RETURN
7547
    On success, return a valid pointer to the created and initialized
7548
    LEX_USER, which contains definer information.
7549
    On error, return 0.
7550 7551
*/

7552
LEX_USER *create_definer(THD *thd, LEX_STRING *user_name, LEX_STRING *host_name)
7553
{
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  LEX_USER *definer;

  /* Create and initialize. */

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  if (! (definer= (LEX_USER*) thd->alloc(sizeof(LEX_USER))))
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    return 0;

  definer->user= *user_name;
  definer->host= *host_name;

  return definer;
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}
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/*
  Retuns information about user or current user.

  SYNOPSIS
    get_current_user()
    thd         [in] thread handler
    user        [in] user

  RETURN
    On success, return a valid pointer to initialized
    LEX_USER, which contains user information.
    On error, return 0.
*/

LEX_USER *get_current_user(THD *thd, LEX_USER *user)
{
  if (!user->user.str)  // current_user
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    return create_default_definer(thd);

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  return user;
}
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/*
  Check that length of a string does not exceed some limit.

  SYNOPSIS
    check_string_length()
      str         string to be checked
      err_msg     error message to be displayed if the string is too long
      max_length  max length

  RETURN
    FALSE   the passed string is not longer than max_length
    TRUE    the passed string is longer than max_length
*/

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bool check_string_length(LEX_STRING *str, const char *err_msg,
                         uint max_length)
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{
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  if (str->length <= max_length)
    return FALSE;
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  my_error(ER_WRONG_STRING_LENGTH, MYF(0), str->str, err_msg, max_length);
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  return TRUE;
}