sql_parse.cc 214 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
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
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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 */

#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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#include "sp_head.h"
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#include "sp.h"
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#include "sp_cache.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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static void time_out_user_resource_limits(THD *thd, USER_CONN *uc);
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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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#endif
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static void decrease_user_connections(USER_CONN *uc);
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static bool check_db_used(THD *thd,TABLE_LIST *tables);
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static bool check_multi_update_lock(THD *thd);
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static void remove_escape(char *name);
static void refresh_status(void);
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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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static char empty_c_string[1]= {0};		// Used for not defined 'db'
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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->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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inline bool all_tables_not_ok(THD *thd, TABLE_LIST *tables)
{
  return (table_rules_on && tables && !tables_ok(thd,tables) &&
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          ((thd->lex->sql_command != SQLCOM_DELETE_MULTI) ||
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           !tables_ok(thd,
		      (TABLE_LIST *)thd->lex->auxilliary_table_list.first)));
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}
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#endif
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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[USERNAME_LENGTH+HOSTNAME_LENGTH+2];
  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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/*
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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->{host,user,ip} are used
    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
    0  OK; thd->user, thd->master_access, thd->priv_user, thd->db and
       thd->db_access 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
  thd->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->db= 0;
    thd->db_length= 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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      if (thd->user_connect)
	decrease_user_connections(thd->user_connect);
      DBUG_RETURN(-1);
    }
  }
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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->db= 0;
  thd->db_length= 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,
                       thd->user, thd->host_or_ip);
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      mysql_log.write(thd, COM_CONNECT, ER(ER_SERVER_IS_IN_SECURE_AUTH_MODE),
                      thd->user, thd->host_or_ip);
      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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      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->master_access & NO_ACCESS)) // authentication is OK 
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    {
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      DBUG_PRINT("info",
                 ("Capabilities: %d  packet_length: %ld  Host: '%s'  "
                  "Login user: '%s' Priv_user: '%s'  Using password: %s "
                  "Access: %u  db: '%s'",
                  thd->client_capabilities, thd->max_client_packet_length,
                  thd->host_or_ip, thd->user, thd->priv_user,
                  passwd_len ? "yes": "no",
                  thd->master_access, thd->db ? thd->db : "*none*"));

      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->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? */
      mysql_log.write(thd,command,
                      (thd->priv_user == thd->user ?
                       (char*) "%s@%s on %s" :
                       (char*) "%s@%s as anonymous on %s"),
                      thd->user, thd->host_or_ip,
                      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->db_access=0;

      /* 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,
            opt_old_style_user_limits ? thd->user : thd->priv_user,
            opt_old_style_user_limits ? thd->host_or_ip : thd->priv_host,
            &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,
                   thd->user,
                   thd->host_or_ip,
                   passwd_len ? ER(ER_YES) : ER(ER_NO));
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  mysql_log.write(thd, COM_CONNECT, ER(ER_ACCESS_DENIED_ERROR),
                  thd->user,
                  thd->host_or_ip,
                  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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  (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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}


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

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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];
}
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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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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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#ifndef NO_EMBEDDED_ACCESS_CHECKS
  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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#else
  return (0);
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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}

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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[USERNAME_LENGTH+HOSTNAME_LENGTH+2];

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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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/*
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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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  if (!thd->host)                           // If TCP/IP connection
  {
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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->ip= my_strdup(ip,MYF(0))))
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      return (ER_OUT_OF_RESOURCES);
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    thd->host_or_ip= thd->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);
      thd->host=ip_to_hostname(&thd->remote.sin_addr,&connect_errors);
      /* Cut very long hostnames to avoid possible overflows */
      if (thd->host)
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      {
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        if (thd->host != my_localhost)
          thd->host[min(strlen(thd->host), HOSTNAME_LENGTH)]= 0;
        thd->host_or_ip= thd->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",
		       thd->host ? thd->host : "unknown host",
		       thd->ip ? thd->ip : "unknown ip"));
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    if (acl_check_host(thd->host,thd->ip))
      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->host));
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    thd->host_or_ip= thd->host;
    thd->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]));
    /*
      Use server character set and collation if
      - client has not specified a character set
      - client character set is the same as the servers
      - client character set doesn't exists in server
    */
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    if (!(thd->variables.character_set_client=
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	  get_charset((uint) net->read_pos[8], MYF(0))) ||
	!my_strcasecmp(&my_charset_latin1,
		       global_system_variables.character_set_client->name,
		       thd->variables.character_set_client->name))
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    {
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      thd->variables.character_set_client=
	global_system_variables.character_set_client;
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      thd->variables.collation_connection=
	global_system_variables.collation_connection;
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      thd->variables.character_set_results=
	global_system_variables.character_set_results;
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    }
    else
    {
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      thd->variables.character_set_results=
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      thd->variables.collation_connection= 
	thd->variables.character_set_client;
    }
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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: %d", 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, thd->variables.net_wait_timeout))
    {
      DBUG_PRINT("error", ("Failed to read user information (pkt_len= %lu)",
			   pkt_len));
      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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  net->read_timeout=(uint) thd->variables.net_read_timeout;
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  char *user= end;
  char *passwd= strend(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
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  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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  /* Since 4.1 all database names are stored in utf8 */
  if (db)
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  {
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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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  }
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  user_buff[copy_and_convert(user_buff, sizeof(user_buff)-1,
                             system_charset_info, user, strlen(user),
                             thd->charset(), &dummy_errors)]= '\0';
  user= user_buff;
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  if (thd->user)
    x_free(thd->user);
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  if (!(thd->user= my_strdup(user, MYF(0))))
    return (ER_OUT_OF_RESOURCES);
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  return check_user(thd, COM_CONNECT, passwd, passwd_len, db, TRUE);
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}

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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;

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  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_decl(handle_one_connection,arg)
{
  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();

1033
#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 */
1035
  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);
1038
    statistic_increment(aborted_connects,&LOCK_status);
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    end_thread(thd,0);
    return 0;
  }
#endif

1044 1045 1046 1047 1048 1049 1050
  /*
    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 %d\n",
		      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
  if (thd->store_globals())
  {
1064
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
1065
    statistic_increment(aborted_connects,&LOCK_status);
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    end_thread(thd,0);
    return 0;
  }

  do
  {
    int error;
    NET *net= &thd->net;
    thd->thread_stack= (char*) &thd;
1075
    net->no_send_error= 0;
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    if ((error=check_connection(thd)))
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    {						// Wrong permissions
      if (error > 0)
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	net_printf_error(thd, error, thd->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__
    netware_reg_user(thd->ip, thd->user, "MySQL");
#endif
1091
    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;
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    thd->proc_info= 0;
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    thd->command= COM_SLEEP;
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    thd->set_time();
    thd->init_for_queries();
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    if (sys_init_connect.value_length && !(thd->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)
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	thd->killed= THD::KILL_CONNECTION;
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      thd->proc_info=0;
      thd->set_time();
      thd->init_for_queries();
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    }

1112 1113
    while (!net->error && net->vio != 0 &&
           !(thd->killed == THD::KILL_CONNECTION))
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    {
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      net->no_send_error= 0;
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      if (do_command(thd))
	break;
    }
1119 1120
    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"),
                          thd->user ? thd->user : "unauthenticated",
                          thd->host_or_ip,
                          (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);
    }
1137
    
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end_thread:
1139
    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;
  } 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 */

1153 1154 1155 1156
/*
  Execute commands from bootstrap_file.
  Used when creating the initial grant tables
*/
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extern "C" pthread_handler_decl(handle_bootstrap,arg)
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{
1160 1161 1162
  THD *thd=(THD*) arg;
  FILE *file=bootstrap_file;
  char *buff;
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  /* The following must be called before DBUG_ENTER */
1165
  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
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    thd->fatal_error();
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    goto end;
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  }
1173 1174
  DBUG_ENTER("handle_bootstrap");

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#ifndef EMBEDDED_LIBRARY
1176 1177
  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;
1180 1181
  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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  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;
1190
  thd->priv_user=thd->user=(char*) my_strdup("boot", MYF(MY_WME));
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  buff= (char*) thd->net.buff;
1193
  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]) ||
1217
           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';
1224 1225 1226 1227
    /*
      We don't need to obtain LOCK_thread_count here because in bootstrap
      mode we have only one thread.
    */
1228
    thd->query_id=next_query_id();
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    mysql_parse(thd,thd->query,length);
    close_thread_tables(thd);			// Free tables
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    if (thd->is_fatal_error)
1232
      break;
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    free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));
1234
#ifdef USING_TRANSACTIONS
1235
    free_root(&thd->transaction.mem_root,MYF(MY_KEEP_PREALLOC));
1236
#endif
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  }
1238 1239 1240

  /* thd->fatal_error should be set in case something went wrong */
end:
1241 1242 1243 1244 1245 1246
  bootstrap_error= thd->is_fatal_error;

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

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#ifndef EMBEDDED_LIBRARY
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  (void) pthread_mutex_lock(&LOCK_thread_count);
  thread_count--;
  (void) pthread_mutex_unlock(&LOCK_thread_count);
1251
  (void) pthread_cond_broadcast(&COND_thread_count);
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  my_thread_end();
  pthread_exit(0);
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#endif
1255
  DBUG_RETURN(0);
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}

1258
    /* This works because items are allocated with sql_alloc() */
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1260
void free_items(Item *item)
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{
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  Item *next;
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  DBUG_ENTER("free_items");
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  for (; item ; item=next)
  {
    next=item->next;
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    item->delete_self();
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  }
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  DBUG_VOID_RETURN;
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}

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    /* This works because items are allocated with sql_alloc() */

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

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int mysql_table_dump(THD* thd, char* db, char* tbl_name, int fd)
{
  TABLE* table;
  TABLE_LIST* table_list;
  int error = 0;
  DBUG_ENTER("mysql_table_dump");
  db = (db && db[0]) ? db : thd->db;
1289
  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))
  {
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    my_error(ER_WRONG_DB_NAME ,MYF(0), db ? db : "NULL");
1299 1300
    goto err;
  }
1301
  if (lower_case_table_names)
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    my_casedn_str(files_charset_info, tbl_name);
1303
  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)))
1314
  {
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    my_error(ER_GET_ERRNO, MYF(0), my_errno);
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    goto err;
  }
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  net_flush(&thd->net);
1319
  if ((error= table->file->dump(thd,fd)))
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    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
1330
    end_trans()
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      thd            Current thread
      completion     Completion type

  RETURN
    0 - OK
*/

1338
int end_trans(THD *thd, enum enum_mysql_completiontype completion)
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{
  bool do_release= 0;
  int res= 0;
1342
  DBUG_ENTER("end_trans");
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1344
  if (unlikely(thd->in_sub_stmt))
1345 1346 1347 1348
  {
    my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0));
    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;
1357
    res= ha_commit(thd);
1358
    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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1394
#ifndef EMBEDDED_LIBRARY
1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405

/*
  Read one command from socket and execute it (query or simple command).
  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)
{
  char *packet;
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  uint old_timeout;
  ulong packet_length;
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  NET *net;
  enum enum_server_command command;
  DBUG_ENTER("do_command");

  net= &thd->net;
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  /*
    indicator of uninitialized lex => normal flow of errors handling
    (see my_message_sql)
  */
1420
  thd->lex->current_select= 0;
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  packet=0;
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  old_timeout=net->read_timeout;
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  /* Wait max for 8 hours */
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  net->read_timeout=(uint) 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)
1436 1437
    {
      statistic_increment(aborted_threads,&LOCK_status);
1438
      DBUG_RETURN(TRUE);			// We have to close it.
1439
    }
1440
    net_send_error(thd, net->last_errno, NullS);
1441
    net->error= 0;
1442
    DBUG_RETURN(FALSE);
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  }
  else
  {
    packet=(char*) net->read_pos;
    command = (enum enum_server_command) (uchar) packet[0];
1448 1449
    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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  net->read_timeout=old_timeout;		// restore it
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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));
1465
}
1466
#endif  /* EMBEDDED_LIBRARY */
1467

1468

1469 1470
/*
   Perform one connection-level (COM_XXXX) command.
1471

1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484
  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
*/
1485

1486 1487 1488 1489
bool dispatch_command(enum enum_server_command command, THD *thd,
		      char* packet, uint packet_length)
{
  NET *net= &thd->net;
1490
  bool error= 0;
1491 1492
  DBUG_ENTER("dispatch_command");

1493 1494 1495
  if (thd->killed == THD::KILL_QUERY || thd->killed == THD::KILL_BAD_DATA)
    thd->killed= THD::NOT_KILLED;

1496
  thd->command=command;
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  /*
1498 1499
    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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  */
1501
  thd->enable_slow_log= TRUE;
1502
  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));
  thd->query_id=query_id;
  if (command != COM_STATISTICS && command != COM_PING)
1507
    next_query_id();
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  thread_running++;
1509
  /* 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);
1514
  switch (command) {
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  case COM_INIT_DB:
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  {
    LEX_STRING tmp;
1518 1519
    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);
1525 1526
      send_ok(thd);
    }
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    break;
  }
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#ifdef HAVE_REPLICATION
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  case COM_REGISTER_SLAVE:
  {
1532
    if (!register_slave(thd, (uchar*)packet, packet_length))
1533
      send_ok(thd);
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    break;
  }
1536
#endif
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  case COM_TABLE_DUMP:
1538 1539 1540 1541 1542
  {
    char *db, *tbl_name;
    uint db_len= *(uchar*) packet;
    uint tbl_len= *(uchar*) (packet + db_len + 1);

1543
    statistic_increment(thd->status_var.com_other, &LOCK_status);
1544
    thd->enable_slow_log= opt_log_slow_admin_statements;
1545 1546 1547
    db= thd->alloc(db_len + tbl_len + 2);
    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, -1);
1549 1550
    break;
  }
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  case COM_CHANGE_USER:
  {
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    thd->change_user();
1554
    thd->clear_error();                         // if errors from rollback
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1556
    statistic_increment(thd->status_var.com_other, &LOCK_status);
1557
    char *user= (char*) packet;
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    char *passwd= strend(user)+1;
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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).
    */
1564
    char db_buff[NAME_LEN+1];                 // buffer to store db in utf8 
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    char *db= passwd;
    uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ? 
      *passwd++ : strlen(passwd);
    db+= passwd_len + 1;
1569
#ifndef EMBEDDED_LIBRARY
1570
    /* Small check for incoming packet */
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    if ((uint) ((uchar*) db - net->read_pos) > packet_length)
1572
    {
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      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
1574 1575
      break;
    }
1576
#endif
1577
    /* Convert database name to utf8 */
1578
    uint dummy_errors;
1579 1580
    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
                             system_charset_info, db, strlen(db),
1581
                             thd->charset(), &dummy_errors)]= 0;
1582
    db= db_buff;
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1584 1585 1586 1587 1588 1589 1590
    /* Save user and privileges */
    uint save_master_access= thd->master_access;
    uint save_db_access= thd->db_access;
    uint save_db_length= thd->db_length;
    char *save_user= thd->user;
    char *save_priv_user= thd->priv_user;
    char *save_db= thd->db;
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    USER_CONN *save_user_connect= thd->user_connect;
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    if (!(thd->user= my_strdup(user, MYF(0))))
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    {
      thd->user= save_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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1604 1605
    if (res)
    {
1606
      /* authentication failure, we shall restore old user */
1607
      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->user);
      thd->user= save_user;
      thd->priv_user= save_priv_user;
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      thd->user_connect= save_user_connect;
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      thd->master_access= save_master_access;
      thd->db_access= save_db_access;
      thd->db= save_db;
      thd->db_length= save_db_length;
    }
    else
    {
      /* we've authenticated new user */
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      if (save_user_connect)
	decrease_user_connections(save_user_connect);
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      x_free((gptr) save_db);
      x_free((gptr) save_user);
    }
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    break;
  }
1628
  case COM_STMT_EXECUTE:
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  {
1630
    mysql_stmt_execute(thd, packet, packet_length);
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    break;
  }
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  case COM_STMT_FETCH:
1634 1635 1636 1637
  {
    mysql_stmt_fetch(thd, packet, packet_length);
    break;
  }
1638
  case COM_STMT_SEND_LONG_DATA:
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  {
1640
    mysql_stmt_get_longdata(thd, packet, packet_length);
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    break;
  }
1643
  case COM_STMT_PREPARE:
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  {
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    mysql_stmt_prepare(thd, packet, packet_length, 0);
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    break;
  }
1648
  case COM_STMT_CLOSE:
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  {
1650
    mysql_stmt_close(thd, packet);
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    break;
  }
1653
  case COM_STMT_RESET:
1654 1655 1656 1657
  {
    mysql_stmt_reset(thd, packet);
    break;
  }
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  case COM_QUERY:
  {
1660 1661
    if (alloc_query(thd, packet, packet_length))
      break;					// fatal error is set
1662
    char *packet_end= thd->query + thd->query_length;
1663
    mysql_log.write(thd,command,"%s",thd->query);
1664
    DBUG_PRINT("query",("%-.4096s",thd->query));
1665
    mysql_parse(thd,thd->query, thd->query_length);
1666

1667
    while (!thd->killed && thd->lex->found_semicolon && !thd->net.report_error)
1668
    {
1669
      char *packet= thd->lex->found_semicolon;
1670
      net->no_send_error= 0;
1671
      /*
1672
        Multiple queries exits, execute them individually
1673
	in embedded server - just store them to be executed later 
1674
      */
1675
#ifndef EMBEDDED_LIBRARY
1676 1677
      if (thd->lock || thd->open_tables || thd->derived_tables ||
          thd->prelocked_mode)
1678
        close_thread_tables(thd);
1679
#endif
1680
      ulong length= (ulong)(packet_end-packet);
1681

1682
      log_slow_statement(thd);
1683

1684
      /* Remove garbage at start of query */
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      while (my_isspace(thd->charset(), *packet) && length > 0)
1686 1687 1688 1689
      {
        packet++;
        length--;
      }
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      VOID(pthread_mutex_lock(&LOCK_thread_count));
1691
      thd->query_length= length;
1692
      thd->query= packet;
1693
      thd->query_id= next_query_id();
1694
      thd->set_time(); /* Reset the query start time. */
1695
      /* TODO: set thd->lex->sql_command to SQLCOM_END here */
1696
      VOID(pthread_mutex_unlock(&LOCK_thread_count));
1697
#ifndef EMBEDDED_LIBRARY
1698
      mysql_parse(thd, packet, length);
1699
#else
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      /*
	'packet' can point inside the query_rest's buffer
	so we have to do memmove here
       */
      if (thd->query_rest.length() > length)
      {
	memmove(thd->query_rest.c_ptr(), packet, length);
	thd->query_rest.length(length);
      }
      else
1710
	thd->query_rest.copy(packet, length, thd->query_rest.charset());
1711 1712 1713

      thd->server_status&= ~ (SERVER_QUERY_NO_INDEX_USED |
                              SERVER_QUERY_NO_GOOD_INDEX_USED);
1714 1715
      break;
#endif /*EMBEDDED_LIBRARY*/
1716 1717
    }

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    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),WAIT_PRIOR);
    DBUG_PRINT("info",("query ready"));
    break;
  }
1723
  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
  {
1730
    char *fields, *pend;
1731 1732
    /* Locked closure of all tables */
    TABLE_LIST *locked_tables= NULL;
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    TABLE_LIST table_list;
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    LEX_STRING conv_name;
1735
    /* Saved variable value */
1736 1737
    my_bool old_innodb_table_locks= 
              IF_INNOBASE_DB(thd->variables.innodb_table_locks, FALSE);
1738

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1740 1741
    statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_FIELDS],
			&LOCK_status);
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    bzero((char*) &table_list,sizeof(table_list));
    if (!(table_list.db=thd->db))
    {
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      my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
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      break;
    }
1748
    pend= strend(packet);
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    thd->convert_string(&conv_name, system_charset_info,
			packet, (uint) (pend-packet), thd->charset());
1751
    table_list.alias= table_list.table_name= conv_name.str;
1752
    packet= pend+1;
1753 1754 1755 1756 1757 1758 1759 1760 1761

    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;
    }

1762
    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;
1765
    mysql_log.write(thd,command,"%s %s",table_list.table_name, fields);
1766
    if (lower_case_table_names)
1767 1768
      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,
		     0, 0))
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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;
1776 1777 1778 1779 1780 1781
    /* 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);
1783

1784 1785
    /* 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);
1787
    thd->lex->unit.cleanup();
1788
    thd->cleanup_after_query();
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1789 1790 1791 1792
    break;
  }
#endif
  case COM_QUIT:
1793
    /* We don't calculate statistics for this command */
1794
    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;
1802
      HA_CREATE_INFO create_info;
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1804 1805
      statistic_increment(thd->status_var.com_stat[SQLCOM_CREATE_DB],
			  &LOCK_status);
1806
      // null test to handle EOM
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      if (!db || !(alias= thd->strdup(db)) || check_db_name(db))
1808
      {
1809
	my_error(ER_WRONG_DB_NAME, MYF(0), db ? db : "NULL");
1810 1811
	break;
      }
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      if (check_access(thd,CREATE_ACL,db,0,1,0))
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	break;
1814
      mysql_log.write(thd,command,packet);
1815
      bzero(&create_info, sizeof(create_info));
1816 1817
      mysql_create_db(thd, (lower_case_table_names == 2 ? alias : db),
                      &create_info, 0);
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      break;
    }
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1820
  case COM_DROP_DB:				// QQ: To be removed
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    {
1822 1823
      statistic_increment(thd->status_var.com_stat[SQLCOM_DROP_DB],
			  &LOCK_status);
1824
      char *db=thd->strdup(packet);
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      /*  null test to handle EOM */
1826
      if (!db || check_db_name(db))
1827
      {
1828
	my_error(ER_WRONG_DB_NAME, MYF(0), db ? db : "NULL");
1829 1830
	break;
      }
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      if (check_access(thd,DROP_ACL,db,0,1,0))
1832
	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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      }
1839
      mysql_log.write(thd,command,db);
1840
      mysql_rm_db(thd, db, 0, 0);
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      break;
    }
1843
#ifndef EMBEDDED_LIBRARY
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1844 1845
  case COM_BINLOG_DUMP:
    {
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      ulong pos;
      ushort flags;
      uint32 slave_server_id;

1850
      statistic_increment(thd->status_var.com_other,&LOCK_status);
1851
      thd->enable_slow_log= opt_log_slow_admin_statements;
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1852
      if (check_global_access(thd, REPL_SLAVE_ACL))
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	break;
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1854

1855
      /* TODO: The following has to be changed to an 8 byte integer */
1856 1857
      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);
1861
      thd->server_id = slave_server_id;
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      mysql_log.write(thd, command, "Log: '%s'  Pos: %ld", packet+10,
                      (long) pos);
1865
      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 */
1868 1869
      error = TRUE;
      net->error = 0;
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      break;
    }
1872
#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;
  }
1886
#ifndef EMBEDDED_LIBRARY
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  case COM_SHUTDOWN:
1888
  {
1889
    statistic_increment(thd->status_var.com_other, &LOCK_status);
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1890
    if (check_global_access(thd,SHUTDOWN_ACL))
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      break; /* purecov: inspected */
1892
    /*
1893 1894 1895 1896
      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].
1897
    */
1898 1899
    enum mysql_enum_shutdown_level level=
      (enum mysql_enum_shutdown_level) (uchar) packet[0];
1900
    DBUG_PRINT("quit",("Got shutdown command for level %u", level));
1901 1902 1903 1904 1905 1906 1907
    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;
    }
1908
    DBUG_PRINT("quit",("Got shutdown command for level %u", level));
1909
    mysql_log.write(thd,command,NullS);
1910
    send_eof(thd);
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#ifdef __WIN__
    sleep(1);					// must wait after eof()
#endif
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#ifndef OS2
1915
    send_eof(thd);				// This is for 'quit request'
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#endif
1917
    close_connection(thd, 0, 1);
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    close_thread_tables(thd);			// Free before kill
    kill_mysql();
    error=TRUE;
    break;
1922
  }
1923
#endif
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1924 1925
  case COM_STATISTICS:
  {
1926
    mysql_log.write(thd,command,NullS);
1927 1928
    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
1934
    ulong uptime = (ulong) (thd->start_time - start_time);
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    sprintf((char*) buff,
1936
	    "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,
1938 1939 1940
	    (int) thread_count, (ulong) thd->query_id,
            (ulong) thd->status_var.long_query_count,
	    thd->status_var.opened_tables, refresh_version, cached_tables(),
1941 1942
	    (uptime ? (ulonglong2double(thd->query_id) / (double) uptime) :
	     (double) 0));
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#ifdef SAFEMALLOC
1944
    if (sf_malloc_cur_memory)				// Using SAFEMALLOC
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      sprintf(strend(buff), "  Memory in use: %ldK  Max memory used: %ldK",
1946 1947
	      (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:
1956
    statistic_increment(thd->status_var.com_other, &LOCK_status);
1957
    send_ok(thd);				// Tell client we are alive
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    break;
  case COM_PROCESS_INFO:
1960 1961
    statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_PROCESSLIST],
			&LOCK_status);
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1962
    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
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1963
      break;
1964
    mysql_log.write(thd,command,NullS);
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    mysqld_list_processes(thd,
			  thd->master_access & PROCESS_ACL ? 
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1967
			  NullS : thd->priv_user, 0);
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1968 1969 1970
    break;
  case COM_PROCESS_KILL:
  {
1971
    statistic_increment(thd->status_var.com_stat[SQLCOM_KILL], &LOCK_status);
1972
    ulong id=(ulong) uint4korr(packet);
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    kill_one_thread(thd,id,false);
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1974 1975
    break;
  }
1976 1977
  case COM_SET_OPTION:
  {
1978 1979
    statistic_increment(thd->status_var.com_stat[SQLCOM_SET_OPTION],
			&LOCK_status);
1980 1981 1982 1983
    enum_mysql_set_option command= (enum_mysql_set_option) uint2korr(packet);
    switch (command) {
    case MYSQL_OPTION_MULTI_STATEMENTS_ON:
      thd->client_capabilities|= CLIENT_MULTI_STATEMENTS;
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1984
      send_eof(thd);
1985 1986 1987
      break;
    case MYSQL_OPTION_MULTI_STATEMENTS_OFF:
      thd->client_capabilities&= ~CLIENT_MULTI_STATEMENTS;
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      send_eof(thd);
1989 1990
      break;
    default:
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1991
      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
1992 1993 1994 1995
      break;
    }
    break;
  }
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  case COM_DEBUG:
1997
    statistic_increment(thd->status_var.com_other, &LOCK_status);
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    if (check_global_access(thd, SUPER_ACL))
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1999
      break;					/* purecov: inspected */
2000
    mysql_print_status();
2001
    mysql_log.write(thd,command,NullS);
2002
    send_eof(thd);
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2003 2004 2005 2006 2007
    break;
  case COM_SLEEP:
  case COM_CONNECT:				// Impossible here
  case COM_TIME:				// Impossible from client
  case COM_DELAYED_INSERT:
2008
  case COM_END:
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2009
  default:
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2010
    my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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2011 2012
    break;
  }
2013 2014
  if (thd->lock || thd->open_tables || thd->derived_tables ||
      thd->prelocked_mode)
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2015 2016 2017 2018
  {
    thd->proc_info="closing tables";
    close_thread_tables(thd);			/* Free tables */
  }
2019 2020 2021 2022 2023 2024 2025 2026 2027 2028
  /*
    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())
2029
    thd->transaction.xid_state.xid.null();
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2030

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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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2034
  if (thd->net.report_error)
2035
    net_send_error(thd);
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2036

2037
  log_slow_statement(thd);
2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052

  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);
}


2053
void log_slow_statement(THD *thd)
2054
{
2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065
  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;
2066
  thd->end_time();				// Set start time
2067

2068 2069 2070 2071 2072
  /*
    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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  {
2074 2075
    thd->proc_info="logging slow query";

2076 2077
    if ((ulong) (thd->start_time - thd->time_after_lock) >
	thd->variables.long_query_time ||
2078 2079
	((thd->server_status &
	  (SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED)) &&
2080
	 (specialflag & SPECIAL_LOG_QUERIES_NOT_USING_INDEXES)))
2081
    {
2082
      thd->status_var.long_query_count++;
2083 2084
      mysql_slow_log.write(thd, thd->query, thd->query_length, start_of_query);
    }
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  }
}

2088

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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;
2094
  switch (schema_table_idx) {
2095 2096
  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 */
2099 2100 2101 2102 2103 2104 2105 2106 2107 2108
    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:
2109
  case SCH_TRIGGERS:
2110
#ifdef DONT_ALLOW_SHOW_COMMANDS
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    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */
2113 2114 2115 2116 2117 2118
    DBUG_RETURN(1);
#else
    {
      char *db= lex->select_lex.db ? lex->select_lex.db : thd->db;
      if (!db)
      {
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	my_message(ER_NO_DB_ERROR,
                   ER(ER_NO_DB_ERROR), MYF(0)); /* purecov: inspected */
2121 2122 2123 2124 2125
        DBUG_RETURN(1);				/* purecov: inspected */
      }
      remove_escape(db);				// Fix escaped '_'
      if (check_db_name(db))
      {
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        my_error(ER_WRONG_DB_NAME, MYF(0), db);
2127 2128 2129 2130 2131 2132
        DBUG_RETURN(1);
      }
      if (check_access(thd,SELECT_ACL,db,&thd->col_access,0,0))
        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),
                 thd->priv_user, thd->priv_host, db);
2135 2136
	DBUG_RETURN(1);
      }
2137 2138 2139 2140 2141
      /*
        We need to do a copy to make this prepared statement safe if this
        was thd->db
      */
      lex->select_lex.db= thd->strdup(db);
2142 2143 2144 2145 2146 2147
      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 */
2150 2151 2152 2153 2154 2155
    DBUG_RETURN(1);
#else
    if (table_ident)
    {
      TABLE_LIST **query_tables_last= lex->query_tables_last;
      sel= new SELECT_LEX();
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2156 2157
      /* 'parent_lex' is used in init_query() so it must be before it. */
      sel->parent_lex= lex;
2158
      sel->init_query();
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      if (!sel->add_table_to_list(thd, table_ident, 0, 0, TL_READ, 
2160 2161 2162 2163 2164 2165
                                 (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 '_'
2166
      remove_escape(table_list->table_name);
2167 2168 2169 2170 2171 2172 2173 2174 2175
      if (check_access(thd,SELECT_ACL | EXTRA_ACL,db,
                       &table_list->grant.privilege, 0, 0))
        DBUG_RETURN(1);				/* purecov: inspected */
      if (grant_option && check_grant(thd, SELECT_ACL, table_list, 2,
                                      UINT_MAX, 0))
        DBUG_RETURN(1);
      break;
    }
#endif
2176 2177 2178
  case SCH_OPEN_TABLES:
  case SCH_VARIABLES:
  case SCH_STATUS:
2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199
  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;
2200
  table_list->schema_table_reformed= 1;
2201 2202
  statistic_increment(thd->status_var.com_stat[lex->orig_sql_command],
                      &LOCK_status);
2203 2204 2205 2206
  DBUG_RETURN(0);
}


2207 2208
/*
  Read query from packet and store in thd->query
2209
  Used in COM_QUERY and COM_STMT_PREPARE
2210 2211 2212 2213 2214 2215 2216

  DESCRIPTION
    Sets the following THD variables:
      query
      query_length

  RETURN VALUES
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2217 2218
    FALSE ok
    TRUE  error;  In this case thd->fatal_error is set
2219 2220 2221 2222 2223
*/

bool alloc_query(THD *thd, char *packet, ulong packet_length)
{
  packet_length--;				// Remove end null
2224
  /* Remove garbage at start and end of query */
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2225
  while (my_isspace(thd->charset(),packet[0]) && packet_length > 0)
2226 2227 2228 2229 2230
  {
    packet++;
    packet_length--;
  }
  char *pos=packet+packet_length;		// Point at end null
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  while (packet_length > 0 &&
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2232
	 (pos[-1] == ';' || my_isspace(thd->charset() ,pos[-1])))
2233 2234 2235 2236 2237
  {
    pos--;
    packet_length--;
  }
  /* We must allocate some extra memory for query cache */
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  thd->query_length= 0;                        // Extra safety: Avoid races
2239 2240
  if (!(thd->query= (char*) thd->memdup_w_gap((gptr) (packet),
					      packet_length,
2241 2242
					      thd->db_length+ 1 +
					      QUERY_CACHE_FLAGS_SIZE)))
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2243
    return TRUE;
2244 2245
  thd->query[packet_length]=0;
  thd->query_length= packet_length;
2246 2247 2248 2249

  /* Reclaim some memory */
  thd->packet.shrink(thd->variables.net_buffer_length);
  thd->convert_buffer.shrink(thd->variables.net_buffer_length);
2250 2251 2252

  if (!(specialflag & SPECIAL_NO_PRIOR))
    my_pthread_setprio(pthread_self(),QUERY_PRIOR);
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2253
  return FALSE;
2254 2255
}

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2256 2257 2258 2259 2260
/****************************************************************************
** mysql_execute_command
** Execute command saved in thd and current_lex->sql_command
****************************************************************************/

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2261
bool
2262
mysql_execute_command(THD *thd)
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2263
{
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  bool	res= FALSE;
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  int 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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2269 2270
  bool slave_fake_lock= 0;
  MYSQL_LOCK *fake_prev_lock= 0;
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VIEW  
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2271
  /* 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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VIEW  
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2273 2274 2275
  /* list of all tables in query */
  TABLE_LIST *all_tables;
  /* most outer SELECT_LEX_UNIT of query */
2276
  SELECT_LEX_UNIT *unit= &lex->unit;
2277
  /* Saved variable value */
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2278
  DBUG_ENTER("mysql_execute_command");
2279
  thd->net.no_send_error= 0;
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VIEW  
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2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296
  /*
    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();
2297
  /* should be assigned after making first tables same */
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VIEW  
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2298
  all_tables= lex->query_tables;
2299 2300 2301 2302
  /* 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  
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2303

2304 2305 2306 2307 2308
  /*
    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.
2309
    Don't reset warnings when executing a stored routine.
2310
  */
2311
  if ((all_tables || &lex->select_lex != lex->all_selects_list ||
2312
       lex->sroutines.records) && !thd->spcont ||
2313
      lex->time_zone_tables_used)
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2314
    mysql_reset_errors(thd, 0);
2315

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SCRUM  
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2316
#ifdef HAVE_REPLICATION
2317 2318
  if (thd->slave_thread)
  {
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2319
    if (lex->sql_command == SQLCOM_UPDATE_MULTI)
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2320 2321 2322
    {
      DBUG_PRINT("info",("need faked locked tables"));
      
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2323
      if (check_multi_update_lock(thd))
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2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334
        goto error;

      /* Fix for replication, the tables are opened and locked,
         now we pretend that we have performed a LOCK TABLES action */
	 
      fake_prev_lock= thd->locked_tables;
      if (thd->lock)
        thd->locked_tables= thd->lock;
      thd->lock= 0;
      slave_fake_lock= 1;
    }
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    /*
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merge  
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2336
      Skip if we are in the slave thread, some table rules have been
2337 2338 2339 2340
      given and the table list says the query should not be replicated.
      Exception is 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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2341
    */
2342 2343
    if (!(lex->sql_command == SQLCOM_DROP_TABLE &&
          lex->drop_temporary && lex->drop_if_exists) &&
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Merge  
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2344
        all_tables_not_ok(thd, all_tables))
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2345 2346
    {
      /* we warn the slave SQL thread */
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2347
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
2348
      DBUG_RETURN(0);
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2349
    }
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merge  
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2350 2351
#ifndef TO_BE_DELETED
    /*
2352 2353 2354
      This is a workaround to deal with the shortcoming in 3.23.44-3.23.46
      masters in RELEASE_LOCK() logging. We re-write SELECT RELEASE_LOCK()
      as DO RELEASE_LOCK()
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merge  
unknown committed
2355
    */
2356 2357 2358
    if (lex->sql_command == SQLCOM_SELECT)
    {
      lex->sql_command = SQLCOM_DO;
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2359
      lex->insert_list = &select_lex->item_list;
2360
    }
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merge  
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2361
#endif
2362
  }
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2363
#endif /* !HAVE_REPLICATION */
2364

2365 2366 2367 2368 2369
  /*
    When option readonly is set deny operations which change tables.
    Except for the replication thread and the 'super' users.
  */
  if (opt_readonly &&
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2370
      !(thd->slave_thread || (thd->master_access & SUPER_ACL)) &&
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2371
      uc_update_queries[lex->sql_command])
2372
  {
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2373
    my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only");
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2374
    DBUG_RETURN(-1);
2375
  }
2376 2377 2378
  if(lex->orig_sql_command == SQLCOM_END)
    statistic_increment(thd->status_var.com_stat[lex->sql_command],
                        &LOCK_status);
2379

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2380 2381 2382
  switch (lex->sql_command) {
  case SQLCOM_SELECT:
  {
2383 2384 2385 2386
    /* assign global limit variable if limit is not given */
    {
      SELECT_LEX *param= lex->unit.global_parameters;
      if (!param->explicit_limit)
2387 2388
	param->select_limit=
          new Item_int((ulonglong)thd->variables.select_limit);
2389 2390
    }

2391
    select_result *result=lex->result;
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2392
    if (all_tables)
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2393
    {
2394 2395 2396 2397 2398 2399
      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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2400 2401
    }
    else
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VIEW  
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2402 2403 2404
      res= check_access(thd,
			lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL,
			any_db, 0, 0, 0);
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2405
    if (res)
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2406
      goto error;
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2407

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VIEW  
unknown committed
2408
    if (!(res= open_and_lock_tables(thd, all_tables)))
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2409
    {
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2410
      if (lex->describe)
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2411
      {
2412
	if (!(result= new select_send()))
2413
	  goto error;
2414 2415
	else
	  thd->send_explain_fields(result);
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2416
	res= mysql_explain_union(thd, &thd->lex->unit, result);
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2417 2418 2419 2420 2421
	if (lex->describe & DESCRIBE_EXTENDED)
	{
	  char buff[1024];
	  String str(buff,(uint32) sizeof(buff), system_charset_info);
	  str.length(0);
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	  thd->lex->unit.print(&str);
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	  str.append('\0');
	  push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
		       ER_YES, str.ptr());
	}
2427
	result->send_eof();
2428
        delete result;
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2429 2430 2431
      }
      else
      {
2432
	if (!result && !(result= new select_send()))
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2433
          goto error;
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VIEW  
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2434
	query_cache_store_query(thd, all_tables);
2435
	res= handle_select(thd, lex, result, 0);
2436 2437
        if (result != lex->result)
          delete result;
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2438
      }
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2439
    }
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    break;
  }
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2442
  case SQLCOM_PREPARE:
2443
  {
2444 2445 2446 2447
    char *query_str;
    uint query_len;
    if (lex->prepared_stmt_code_is_varref)
    {
2448
      /* This is PREPARE stmt FROM @var. */
2449 2450 2451 2452
      String str;
      CHARSET_INFO *to_cs= thd->variables.collation_connection;
      bool need_conversion;
      user_var_entry *entry;
2453
      String *pstr= &str;
2454
      uint32 unused;
2455
      /*
2456 2457 2458
        Convert @var contents to string in connection character set. Although
        it is known that int/real/NULL value cannot be a valid query we still
        convert it for error messages to uniform.
2459
      */
2460 2461
      if ((entry=
             (user_var_entry*)hash_search(&thd->user_vars,
2462 2463 2464 2465
                                          (byte*)lex->prepared_stmt_code.str,
                                          lex->prepared_stmt_code.length))
          && entry->value)
      {
2466 2467
        my_bool is_var_null;
        pstr= entry->val_str(&is_var_null, &str, NOT_FIXED_DEC);
2468 2469 2470 2471
        /*
          NULL value of variable checked early as entry->value so here
          we can't get NULL in normal conditions
        */
2472 2473
        DBUG_ASSERT(!is_var_null);
        if (!pstr)
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2474
          goto error;
2475 2476
      }
      else
2477 2478 2479 2480 2481
      {
        /*
          variable absent or equal to NULL, so we need to set variable to
          something reasonable to get readable error message during parsing
        */
2482
        str.set("NULL", 4, &my_charset_latin1);
2483 2484
      }

2485
      need_conversion=
2486 2487
        String::needs_conversion(pstr->length(), pstr->charset(),
                                 to_cs, &unused);
2488

2489 2490
      query_len= need_conversion? (pstr->length() * to_cs->mbmaxlen) :
                                  pstr->length();
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2491
      if (!(query_str= alloc_root(thd->mem_root, query_len+1)))
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2492
        goto error;
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merge  
unknown committed
2493
 
2494
      if (need_conversion)
2495 2496 2497 2498 2499 2500
      {
        uint dummy_errors;
        query_len= copy_and_convert(query_str, query_len, to_cs,
                                    pstr->ptr(), pstr->length(),
                                    pstr->charset(), &dummy_errors);
      }
2501
      else
2502
        memcpy(query_str, pstr->ptr(), pstr->length());
2503
      query_str[query_len]= 0;
2504 2505 2506
    }
    else
    {
2507 2508
      query_str= lex->prepared_stmt_code.str;
      query_len= lex->prepared_stmt_code.length;
2509
      DBUG_PRINT("info", ("PREPARE: %.*s FROM '%.*s' \n",
2510 2511
                          lex->prepared_stmt_name.length,
                          lex->prepared_stmt_name.str,
2512
                          query_len, query_str));
2513
    }
2514
    thd->command= COM_STMT_PREPARE;
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2515 2516
    if (!(res= mysql_stmt_prepare(thd, query_str, query_len + 1,
                                  &lex->prepared_stmt_name)))
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2517 2518 2519 2520 2521
      send_ok(thd, 0L, 0L, "Statement prepared");
    break;
  }
  case SQLCOM_EXECUTE:
  {
2522
    DBUG_PRINT("info", ("EXECUTE: %.*s\n",
2523 2524 2525
                        lex->prepared_stmt_name.length,
                        lex->prepared_stmt_name.str));
    mysql_sql_stmt_execute(thd, &lex->prepared_stmt_name);
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2526 2527 2528 2529 2530
    lex->prepared_stmt_params.empty();
    break;
  }
  case SQLCOM_DEALLOCATE_PREPARE:
  {
2531 2532 2533 2534
    Statement* stmt;
    DBUG_PRINT("info", ("DEALLOCATE PREPARE: %.*s\n", 
                        lex->prepared_stmt_name.length,
                        lex->prepared_stmt_name.str));
2535
    /* We account deallocate in the same manner as mysql_stmt_close */
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2536
    statistic_increment(thd->status_var.com_stmt_close, &LOCK_status);
2537
    if ((stmt= thd->stmt_map.find_by_name(&lex->prepared_stmt_name)))
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2538
    {
2539 2540
      thd->stmt_map.erase(stmt);
      send_ok(thd);
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2541
    }
2542
    else
2543 2544
    {
      my_error(ER_UNKNOWN_STMT_HANDLER, MYF(0),
2545 2546
               lex->prepared_stmt_name.length,
               lex->prepared_stmt_name.str,
2547
               "DEALLOCATE PREPARE");
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2548
      goto error;
2549
    }
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2550 2551
    break;
  }
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2552
  case SQLCOM_DO:
2553 2554
    if (check_table_access(thd, SELECT_ACL, all_tables, 0) ||
        open_and_lock_tables(thd, all_tables))
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2555
      goto error;
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2556 2557

    res= mysql_do(thd, *lex->insert_list);
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2558 2559
    break;

2560
  case SQLCOM_EMPTY_QUERY:
2561
    send_ok(thd);
2562 2563
    break;

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2564 2565 2566 2567
  case SQLCOM_HELP:
    res= mysqld_help(thd,lex->help_arg);
    break;

2568
#ifndef EMBEDDED_LIBRARY
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2569
  case SQLCOM_PURGE:
2570
  {
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2571
    if (check_global_access(thd, SUPER_ACL))
2572
      goto error;
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2573
    /* PURGE MASTER LOGS TO 'file' */
2574 2575 2576
    res = purge_master_logs(thd, lex->to_log);
    break;
  }
2577 2578
  case SQLCOM_PURGE_BEFORE:
  {
2579 2580
    Item *it;

2581 2582
    if (check_global_access(thd, SUPER_ACL))
      goto error;
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2583
    /* PURGE MASTER LOGS BEFORE 'data' */
2584
    it= (Item *)lex->value_list.head();
2585
    if ((!it->fixed && it->fix_fields(lex->thd, &it)) ||
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2586
        it->check_cols(1))
2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597
    {
      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());
2598 2599
    break;
  }
2600
#endif
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2601 2602
  case SQLCOM_SHOW_WARNS:
  {
2603 2604
    res= mysqld_show_warnings(thd, (ulong)
			      ((1L << (uint) MYSQL_ERROR::WARN_LEVEL_NOTE) |
2605 2606 2607
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_WARN) |
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR)
			       ));
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2608 2609 2610 2611
    break;
  }
  case SQLCOM_SHOW_ERRORS:
  {
2612 2613
    res= mysqld_show_warnings(thd, (ulong)
			      (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR));
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2614 2615
    break;
  }
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2616 2617
  case SQLCOM_SHOW_NEW_MASTER:
  {
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2618
    if (check_global_access(thd, REPL_SLAVE_ACL))
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unknown committed
2619
      goto error;
2620
    /* This query don't work now. See comment in repl_failsafe.cc */
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unknown committed
2621
#ifndef WORKING_NEW_MASTER
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unknown committed
2622 2623
    my_error(ER_NOT_SUPPORTED_YET, MYF(0), "SHOW NEW MASTER");
    goto error;
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2624
#else
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2625 2626
    res = show_new_master(thd);
    break;
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2627
#endif
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2628
  }
2629

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2630
#ifdef HAVE_REPLICATION
2631 2632
  case SQLCOM_SHOW_SLAVE_HOSTS:
  {
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2633
    if (check_global_access(thd, REPL_SLAVE_ACL))
2634 2635 2636 2637
      goto error;
    res = show_slave_hosts(thd);
    break;
  }
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2638 2639
  case SQLCOM_SHOW_BINLOG_EVENTS:
  {
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2640
    if (check_global_access(thd, REPL_SLAVE_ACL))
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2641
      goto error;
2642
    res = mysql_show_binlog_events(thd);
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2643 2644
    break;
  }
2645 2646
#endif

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2647
  case SQLCOM_BACKUP_TABLE:
2648
  {
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VIEW  
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2649 2650 2651
    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) ||
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unknown committed
2652
	check_global_access(thd, FILE_ACL))
2653
      goto error; /* purecov: inspected */
2654
    thd->enable_slow_log= opt_log_slow_admin_statements;
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VIEW  
unknown committed
2655
    res = mysql_backup_table(thd, first_table);
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2656

2657 2658
    break;
  }
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2659
  case SQLCOM_RESTORE_TABLE:
2660
  {
unknown's avatar
VIEW  
unknown committed
2661 2662 2663
    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) ||
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unknown committed
2664
	check_global_access(thd, FILE_ACL))
2665
      goto error; /* purecov: inspected */
2666
    thd->enable_slow_log= opt_log_slow_admin_statements;
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VIEW  
unknown committed
2667
    res = mysql_restore_table(thd, first_table);
2668 2669
    break;
  }
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2670 2671
  case SQLCOM_ASSIGN_TO_KEYCACHE:
  {
unknown's avatar
VIEW  
unknown committed
2672 2673 2674 2675
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
        check_access(thd, INDEX_ACL, first_table->db,
                     &first_table->grant.privilege, 0, 0))
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unknown committed
2676
      goto error;
2677
    res= mysql_assign_to_keycache(thd, first_table, &lex->ident);
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2678 2679
    break;
  }
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unknown committed
2680 2681
  case SQLCOM_PRELOAD_KEYS:
  {
unknown's avatar
VIEW  
unknown committed
2682 2683 2684 2685
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_access(thd, INDEX_ACL, first_table->db,
                     &first_table->grant.privilege, 0, 0))
2686
      goto error;
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VIEW  
unknown committed
2687
    res = mysql_preload_keys(thd, first_table);
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2688 2689
    break;
  }
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2690
#ifdef HAVE_REPLICATION
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2691
  case SQLCOM_CHANGE_MASTER:
2692
  {
unknown's avatar
unknown committed
2693
    if (check_global_access(thd, SUPER_ACL))
2694
      goto error;
2695
    pthread_mutex_lock(&LOCK_active_mi);
2696
    res = change_master(thd,active_mi);
2697
    pthread_mutex_unlock(&LOCK_active_mi);
2698 2699
    break;
  }
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2700
  case SQLCOM_SHOW_SLAVE_STAT:
2701
  {
2702 2703
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2704
      goto error;
2705
    pthread_mutex_lock(&LOCK_active_mi);
2706
    res = show_master_info(thd,active_mi);
2707
    pthread_mutex_unlock(&LOCK_active_mi);
2708 2709
    break;
  }
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unknown committed
2710
  case SQLCOM_SHOW_MASTER_STAT:
2711
  {
2712 2713
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2714 2715 2716 2717
      goto error;
    res = show_binlog_info(thd);
    break;
  }
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2718

2719
  case SQLCOM_LOAD_MASTER_DATA: // sync with master
unknown's avatar
unknown committed
2720
    if (check_global_access(thd, SUPER_ACL))
2721
      goto error;
2722
    if (end_active_trans(thd))
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unknown committed
2723
      goto error;
2724 2725
    else
      res = load_master_data(thd);
2726
    break;
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2727
#endif /* HAVE_REPLICATION */
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2728 2729 2730
#ifdef HAVE_INNOBASE_DB
  case SQLCOM_SHOW_INNODB_STATUS:
    {
2731
      if (check_global_access(thd, SUPER_ACL))
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unknown committed
2732 2733 2734 2735
	goto error;
      res = innodb_show_status(thd);
      break;
    }
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unknown committed
2736 2737 2738
  case SQLCOM_SHOW_MUTEX_STATUS:
    {
      if (check_global_access(thd, SUPER_ACL))
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2739
        goto error;
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unknown committed
2740 2741 2742
      res = innodb_mutex_show_status(thd);
      break;
    }
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2743
#endif
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unknown committed
2744
#ifdef HAVE_REPLICATION
unknown's avatar
unknown committed
2745
  case SQLCOM_LOAD_MASTER_TABLE:
2746
  {
unknown's avatar
VIEW  
unknown committed
2747 2748 2749 2750 2751
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (!first_table->db)
      first_table->db= thd->db;
    if (check_access(thd, CREATE_ACL, first_table->db,
		     &first_table->grant.privilege, 0, 0))
unknown's avatar
unknown committed
2752 2753 2754 2755
      goto error;				/* purecov: inspected */
    if (grant_option)
    {
      /* Check that the first table has CREATE privilege */
unknown's avatar
VIEW  
unknown committed
2756
      if (check_grant(thd, CREATE_ACL, all_tables, 0, 1, 0))
2757
	goto error;
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unknown committed
2758
    }
2759
    if (strlen(first_table->table_name) > NAME_LEN)
unknown's avatar
unknown committed
2760
    {
2761
      my_error(ER_WRONG_TABLE_NAME, MYF(0), first_table->table_name);
unknown's avatar
unknown committed
2762 2763
      break;
    }
2764
    pthread_mutex_lock(&LOCK_active_mi);
2765 2766 2767 2768
    /*
      fetch_master_table will send the error to the client on failure.
      Give error if the table already exists.
    */
2769
    if (!fetch_master_table(thd, first_table->db, first_table->table_name,
2770
			    active_mi, 0, 0))
2771
    {
2772
      send_ok(thd);
2773
    }
2774
    pthread_mutex_unlock(&LOCK_active_mi);
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unknown committed
2775
    break;
2776
  }
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2777
#endif /* HAVE_REPLICATION */
2778

unknown's avatar
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2779
  case SQLCOM_CREATE_TABLE:
unknown's avatar
unknown committed
2780
  {
2781
    /* If CREATE TABLE of non-temporary table, do implicit commit */
2782 2783 2784 2785 2786 2787 2788 2789 2790 2791
    if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE))
    {
      if (end_active_trans(thd))
      {
	res= -1;
	break;
      }
    }
    else 
    {
unknown's avatar
unknown committed
2792 2793
      /* So that CREATE TEMPORARY TABLE gets to binlog at commit/rollback */
      thd->options|= OPTION_STATUS_NO_TRANS_UPDATE;
2794
    }
unknown's avatar
VIEW  
unknown committed
2795 2796 2797 2798 2799
    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
2800

unknown's avatar
VIEW  
unknown committed
2801
    if ((res= create_table_precheck(thd, select_tables, create_table)))
unknown's avatar
unknown committed
2802
      goto end_with_restore_list;
unknown's avatar
unknown committed
2803

2804 2805 2806
#ifndef HAVE_READLINK
    lex->create_info.data_file_name=lex->create_info.index_file_name=0;
#else
2807
    /* Fix names if symlinked tables */
unknown's avatar
unknown committed
2808
    if (append_file_to_dir(thd, &lex->create_info.data_file_name,
2809
			   create_table->table_name) ||
unknown's avatar
VIEW  
unknown committed
2810
	append_file_to_dir(thd, &lex->create_info.index_file_name,
2811
			   create_table->table_name))
unknown's avatar
unknown committed
2812
      goto end_with_restore_list;
2813
#endif
2814
    /*
2815
      If we are using SET CHARSET without DEFAULT, add an implicit
2816 2817 2818 2819 2820 2821 2822 2823 2824 2825 2826
      DEFAULT to not confuse old users. (This may change).
    */
    if ((lex->create_info.used_fields & 
	 (HA_CREATE_USED_DEFAULT_CHARSET | HA_CREATE_USED_CHARSET)) ==
	HA_CREATE_USED_CHARSET)
    {
      lex->create_info.used_fields&= ~HA_CREATE_USED_CHARSET;
      lex->create_info.used_fields|= HA_CREATE_USED_DEFAULT_CHARSET;
      lex->create_info.default_table_charset= lex->create_info.table_charset;
      lex->create_info.table_charset= 0;
    }
2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841
    /*
      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.
    */
    if (wait_if_global_read_lock(thd, 0, 1))
    {
unknown's avatar
unknown committed
2842 2843
      res= 1;
      goto end_with_restore_list;
2844
    }
2845
    if (select_lex->item_list.elements)		// With select
unknown's avatar
unknown committed
2846 2847
    {
      select_result *result;
2848

2849
      select_lex->options|= SELECT_NO_UNLOCK;
2850
      unit->set_limit(select_lex);
2851

unknown's avatar
VIEW  
unknown committed
2852
      if (!(res= open_and_lock_tables(thd, select_tables)))
2853
      {
2854 2855 2856 2857 2858 2859 2860
        /*
          Is table which we are changing used somewhere in other parts
          of query
        */
        if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
            unique_table(create_table, select_tables))
        {
2861
          my_error(ER_UPDATE_TABLE_USED, MYF(0), create_table->table_name);
unknown's avatar
unknown committed
2862 2863
          res= 1;
          goto end_with_restart_wait;
2864
        }
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unknown committed
2865 2866 2867 2868 2869 2870 2871 2872 2873 2874
        /* If we create merge table, we have to test tables in merge, too */
        if (lex->create_info.used_fields & HA_CREATE_USED_UNION)
        {
          TABLE_LIST *tab;
          for (tab= (TABLE_LIST*) lex->create_info.merge_list.first;
               tab;
               tab= tab->next_local)
          {
            if (unique_table(tab, select_tables))
            {
2875
              my_error(ER_UPDATE_TABLE_USED, MYF(0), tab->table_name);
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unknown committed
2876 2877
              res= 1;
              goto end_with_restart_wait;
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unknown committed
2878 2879 2880
            }
          }
        }
2881

unknown's avatar
VIEW  
unknown committed
2882 2883 2884 2885 2886
        if ((result= new select_create(create_table,
				       &lex->create_info,
				       lex->create_list,
				       lex->key_list,
				       select_lex->item_list,
2887 2888
				       lex->duplicates,
				       lex->ignore)))
2889 2890 2891 2892 2893
        {
          /*
            CREATE from SELECT give its SELECT_LEX for SELECT,
            and item_list belong to SELECT
          */
2894
          res= handle_select(thd, lex, result, 0);
2895
          delete result;
2896
        }
unknown's avatar
unknown committed
2897
	/* reset for PS */
2898 2899
	lex->create_list.empty();
	lex->key_list.empty();
2900 2901
      }
    }
unknown's avatar
unknown committed
2902
    else
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unknown committed
2903
    {
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unknown committed
2904
      /* regular create */
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2905
      if (lex->name)
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unknown committed
2906
        res= mysql_create_like_table(thd, create_table, &lex->create_info, 
unknown's avatar
unknown committed
2907 2908
                                     (Table_ident *)lex->name); 
      else
2909
      {
unknown's avatar
VIEW  
unknown committed
2910
        res= mysql_create_table(thd, create_table->db,
2911
				create_table->table_name, &lex->create_info,
unknown's avatar
VIEW  
unknown committed
2912
				lex->create_list,
unknown's avatar
unknown committed
2913
				lex->key_list, 0, 0);
2914
      }
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unknown committed
2915
      if (!res)
2916
	send_ok(thd);
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2917
    }
2918

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2919
end_with_restart_wait:
2920 2921 2922 2923 2924 2925
    /*
      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);

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2926
    /* put tables back for PS rexecuting */
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2927
end_with_restore_list:
unknown's avatar
VIEW  
unknown committed
2928
    lex->link_first_table_back(create_table, link_to_local);
unknown's avatar
unknown committed
2929
    break;
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unknown committed
2930
  }
unknown's avatar
unknown committed
2931
  case SQLCOM_CREATE_INDEX:
unknown's avatar
VIEW  
unknown committed
2932 2933
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_one_table_access(thd, INDEX_ACL, all_tables))
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unknown committed
2934
      goto error; /* purecov: inspected */
2935
    thd->enable_slow_log= opt_log_slow_admin_statements;
2936
    if (end_active_trans(thd))
unknown's avatar
unknown committed
2937
      goto error;
2938
    else
unknown's avatar
VIEW  
unknown committed
2939
      res = mysql_create_index(thd, first_table, lex->key_list);
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2940 2941
    break;

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2942
#ifdef HAVE_REPLICATION
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2943
  case SQLCOM_SLAVE_START:
2944
  {
2945
    pthread_mutex_lock(&LOCK_active_mi);
2946
    start_slave(thd,active_mi,1 /* net report*/);
2947
    pthread_mutex_unlock(&LOCK_active_mi);
unknown's avatar
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2948
    break;
2949
  }
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2950
  case SQLCOM_SLAVE_STOP:
2951 2952 2953 2954 2955 2956
  /*
    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,
2957
      so it waits for the client thread because t is locked by it.
2958
    - then the client thread does SLAVE STOP.
2959 2960
      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.
2961 2962 2963 2964 2965
    To prevent that, refuse SLAVE STOP if the
    client thread has locked tables
  */
  if (thd->locked_tables || thd->active_transaction())
  {
2966 2967
    my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
               ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
2968
    goto error;
2969
  }
2970
  {
2971
    pthread_mutex_lock(&LOCK_active_mi);
2972
    stop_slave(thd,active_mi,1/* net report*/);
2973
    pthread_mutex_unlock(&LOCK_active_mi);
unknown's avatar
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2974
    break;
2975
  }
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2976
#endif /* HAVE_REPLICATION */
2977

unknown's avatar
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2978
  case SQLCOM_ALTER_TABLE:
unknown's avatar
VIEW  
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2979
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
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2980
#if defined(DONT_ALLOW_SHOW_COMMANDS)
unknown's avatar
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2981 2982
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
2983
    goto error;
unknown's avatar
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2984 2985
#else
    {
unknown's avatar
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2986
      ulong priv=0;
unknown's avatar
unknown committed
2987
      if (lex->name && (!lex->name[0] || strlen(lex->name) > NAME_LEN))
unknown's avatar
unknown committed
2988
      {
2989
	my_error(ER_WRONG_TABLE_NAME, MYF(0), lex->name);
unknown's avatar
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2990
        goto error;
unknown's avatar
unknown committed
2991
      }
2992
      if (!select_lex->db)
unknown's avatar
VIEW  
unknown committed
2993 2994 2995
	select_lex->db= first_table->db;
      if (check_access(thd, ALTER_ACL, first_table->db,
		       &first_table->grant.privilege, 0, 0) ||
unknown's avatar
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2996
	  check_access(thd,INSERT_ACL | CREATE_ACL,select_lex->db,&priv,0,0)||
unknown's avatar
VIEW  
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2997
	  check_merge_table_access(thd, first_table->db,
2998 2999 3000
				   (TABLE_LIST *)
				   lex->create_info.merge_list.first))
	goto error;				/* purecov: inspected */
unknown's avatar
unknown committed
3001 3002
      if (grant_option)
      {
unknown's avatar
VIEW  
unknown committed
3003
	if (check_grant(thd, ALTER_ACL, all_tables, 0, UINT_MAX, 0))
unknown's avatar
unknown committed
3004 3005 3006 3007 3008
	  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));
3009
	  tmp_table.table_name=lex->name;
3010
	  tmp_table.db=select_lex->db;
unknown's avatar
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3011
	  tmp_table.grant.privilege=priv;
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unknown committed
3012 3013
	  if (check_grant(thd, INSERT_ACL | CREATE_ACL, &tmp_table, 0,
			  UINT_MAX, 0))
unknown's avatar
unknown committed
3014 3015 3016
	    goto error;
	}
      }
3017 3018
      /* Don't yet allow changing of symlinks with ALTER TABLE */
      lex->create_info.data_file_name=lex->create_info.index_file_name=0;
unknown's avatar
unknown committed
3019
      /* ALTER TABLE ends previous transaction */
3020
      if (end_active_trans(thd))
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3021
	goto error;
unknown's avatar
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3022
      else
unknown's avatar
unknown committed
3023
      {
3024
        thd->enable_slow_log= opt_log_slow_admin_statements;
3025
	res= mysql_alter_table(thd, select_lex->db, lex->name,
unknown's avatar
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3026
			       &lex->create_info,
unknown's avatar
VIEW  
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3027
			       first_table, lex->create_list,
3028
			       lex->key_list,
3029
			       select_lex->order_list.elements,
3030
                               (ORDER *) select_lex->order_list.first,
unknown's avatar
unknown committed
3031 3032
			       lex->duplicates, lex->ignore, &lex->alter_info,
                               1);
unknown's avatar
unknown committed
3033
      }
unknown's avatar
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3034 3035
      break;
    }
unknown's avatar
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3036
#endif /*DONT_ALLOW_SHOW_COMMANDS*/
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3037
  case SQLCOM_RENAME_TABLE:
unknown's avatar
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3038
  {
unknown's avatar
VIEW  
unknown committed
3039
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
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3040
    TABLE_LIST *table;
unknown's avatar
VIEW  
unknown committed
3041
    if (check_db_used(thd, all_tables))
unknown's avatar
unknown committed
3042
      goto error;
unknown's avatar
VIEW  
unknown committed
3043
    for (table= first_table; table; table= table->next_local->next_local)
unknown's avatar
unknown committed
3044
    {
unknown's avatar
unknown committed
3045
      if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
unknown's avatar
unknown committed
3046
		       &table->grant.privilege,0,0) ||
unknown's avatar
VIEW  
unknown committed
3047 3048
	  check_access(thd, INSERT_ACL | CREATE_ACL, table->next_local->db,
		       &table->next_local->grant.privilege, 0, 0))
unknown's avatar
unknown committed
3049 3050 3051
	goto error;
      if (grant_option)
      {
unknown's avatar
VIEW  
unknown committed
3052
	TABLE_LIST old_list, new_list;
unknown's avatar
unknown committed
3053 3054 3055 3056
	/*
	  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
3057 3058 3059 3060
	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,
3061
			    INSERT_ACL | CREATE_ACL) &&
unknown's avatar
VIEW  
unknown committed
3062
	     check_grant(thd, INSERT_ACL | CREATE_ACL, &new_list, 0, 1, 0)))
unknown's avatar
unknown committed
3063 3064 3065
	  goto error;
      }
    }
unknown's avatar
VIEW  
unknown committed
3066
    query_cache_invalidate3(thd, first_table, 0);
unknown's avatar
unknown committed
3067 3068
    if (end_active_trans(thd) || mysql_rename_tables(thd, first_table))
      goto error;
unknown's avatar
unknown committed
3069
    break;
unknown's avatar
unknown committed
3070
  }
3071
#ifndef EMBEDDED_LIBRARY
unknown's avatar
unknown committed
3072 3073
  case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
unknown's avatar
unknown committed
3074 3075
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
3076
    goto error;
unknown's avatar
unknown committed
3077 3078
#else
    {
unknown's avatar
unknown committed
3079
      if (check_global_access(thd, SUPER_ACL))
unknown's avatar
unknown committed
3080 3081 3082 3083
	goto error;
      res = show_binlogs(thd);
      break;
    }
unknown's avatar
unknown committed
3084
#endif
3085
#endif /* EMBEDDED_LIBRARY */
unknown's avatar
unknown committed
3086
  case SQLCOM_SHOW_CREATE:
unknown's avatar
VIEW  
unknown committed
3087
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
3088
#ifdef DONT_ALLOW_SHOW_COMMANDS
unknown's avatar
unknown committed
3089 3090
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
3091
    goto error;
unknown's avatar
unknown committed
3092
#else
unknown's avatar
unknown committed
3093
    {
3094 3095 3096 3097
      /* Ignore temporary tables if this is "SHOW CREATE VIEW" */
      if (lex->only_view)
        first_table->skip_temporary= 1;

unknown's avatar
VIEW  
unknown committed
3098 3099 3100
      if (check_db_used(thd, all_tables) ||
	  check_access(thd, SELECT_ACL | EXTRA_ACL, first_table->db,
		       &first_table->grant.privilege, 0, 0))
unknown's avatar
unknown committed
3101
	goto error;
unknown's avatar
unknown committed
3102
      if (grant_option && check_grant(thd, SELECT_ACL, all_tables, 2, UINT_MAX, 0))
3103
	goto error;
unknown's avatar
unknown committed
3104
      res= mysqld_show_create(thd, first_table);
unknown's avatar
unknown committed
3105 3106
      break;
    }
unknown's avatar
unknown committed
3107
#endif
3108 3109
  case SQLCOM_CHECKSUM:
  {
unknown's avatar
VIEW  
unknown committed
3110 3111 3112
    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))
3113
      goto error; /* purecov: inspected */
unknown's avatar
VIEW  
unknown committed
3114
    res = mysql_checksum_table(thd, first_table, &lex->check_opt);
3115 3116
    break;
  }
unknown's avatar
unknown committed
3117
  case SQLCOM_REPAIR:
3118
  {
unknown's avatar
VIEW  
unknown committed
3119 3120 3121
    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))
3122
      goto error; /* purecov: inspected */
3123
    thd->enable_slow_log= opt_log_slow_admin_statements;
unknown's avatar
VIEW  
unknown committed
3124
    res= mysql_repair_table(thd, first_table, &lex->check_opt);
3125 3126 3127 3128 3129
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      if (mysql_bin_log.is_open())
      {
unknown's avatar
unknown committed
3130
	thd->clear_error(); // No binlog error generated
3131
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3132 3133 3134
        mysql_bin_log.write(&qinfo);
      }
    }
3135 3136
    break;
  }
unknown's avatar
unknown committed
3137
  case SQLCOM_CHECK:
3138
  {
unknown's avatar
VIEW  
unknown committed
3139 3140 3141
    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))
3142
      goto error; /* purecov: inspected */
3143
    thd->enable_slow_log= opt_log_slow_admin_statements;
unknown's avatar
VIEW  
unknown committed
3144
    res = mysql_check_table(thd, first_table, &lex->check_opt);
3145 3146
    break;
  }
unknown's avatar
unknown committed
3147 3148
  case SQLCOM_ANALYZE:
  {
unknown's avatar
VIEW  
unknown committed
3149 3150 3151
    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
3152
      goto error; /* purecov: inspected */
3153
    thd->enable_slow_log= opt_log_slow_admin_statements;
unknown's avatar
VIEW  
unknown committed
3154
    res = mysql_analyze_table(thd, first_table, &lex->check_opt);
3155 3156 3157 3158 3159
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      if (mysql_bin_log.is_open())
      {
unknown's avatar
unknown committed
3160
	thd->clear_error(); // No binlog error generated
3161
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3162 3163 3164
        mysql_bin_log.write(&qinfo);
      }
    }
unknown's avatar
unknown committed
3165
    break;
unknown's avatar
unknown committed
3166
  }
3167

unknown's avatar
unknown committed
3168 3169
  case SQLCOM_OPTIMIZE:
  {
unknown's avatar
VIEW  
unknown committed
3170 3171 3172
    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
3173
      goto error; /* purecov: inspected */
3174
    thd->enable_slow_log= opt_log_slow_admin_statements;
3175
    res= (specialflag & (SPECIAL_SAFE_MODE | SPECIAL_NO_NEW_FUNC)) ?
unknown's avatar
VIEW  
unknown committed
3176 3177
      mysql_recreate_table(thd, first_table, 1) :
      mysql_optimize_table(thd, first_table, &lex->check_opt);
3178 3179 3180 3181 3182
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      if (mysql_bin_log.is_open())
      {
unknown's avatar
unknown committed
3183
	thd->clear_error(); // No binlog error generated
3184
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3185 3186 3187
        mysql_bin_log.write(&qinfo);
      }
    }
unknown's avatar
unknown committed
3188 3189 3190
    break;
  }
  case SQLCOM_UPDATE:
unknown's avatar
VIEW  
unknown committed
3191 3192
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (update_precheck(thd, all_tables))
unknown's avatar
unknown committed
3193
      break;
3194 3195
    DBUG_ASSERT(select_lex->offset_limit == 0);
    unit->set_limit(select_lex);
unknown's avatar
unknown committed
3196 3197 3198 3199 3200 3201
    res= (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,
3202
                               unit->select_limit_cnt,
3203
                               lex->duplicates, lex->ignore));
3204
    /* mysql_update return 2 if we need to switch to multi-update */
unknown's avatar
unknown committed
3205
    if (result != 2)
3206
      break;
3207
  case SQLCOM_UPDATE_MULTI:
3208
    {
unknown's avatar
unknown committed
3209
      DBUG_ASSERT(first_table == all_tables && first_table != 0);
3210
      /* if we switched from normal update, rights are checked */
unknown's avatar
unknown committed
3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221 3222 3223
      if (result != 2)
      {
        if ((res= multi_update_precheck(thd, all_tables)))
          break;
      }
      else
        res= 0;

      res= mysql_multi_update(thd, all_tables,
                              &select_lex->item_list,
                              &lex->value_list,
                              select_lex->where,
                              select_lex->options,
3224
                              lex->duplicates, lex->ignore, unit, select_lex);
unknown's avatar
unknown committed
3225
    break;
unknown's avatar
unknown committed
3226
  }
unknown's avatar
unknown committed
3227
  case SQLCOM_REPLACE:
3228 3229
  case SQLCOM_INSERT:
  {
unknown's avatar
VIEW  
unknown committed
3230
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
3231
    if ((res= insert_precheck(thd, all_tables)))
unknown's avatar
unknown committed
3232
      break;
3233 3234
    /* Skip first table, which is the table we are inserting in */
    select_lex->context.table_list= first_table->next_local;
unknown's avatar
VIEW  
unknown committed
3235
    res= mysql_insert(thd, all_tables, lex->field_list, lex->many_values,
unknown's avatar
unknown committed
3236
		      lex->update_list, lex->value_list,
3237
                      lex->duplicates, lex->ignore);
unknown's avatar
VIEW  
unknown committed
3238 3239
    if (first_table->view && !first_table->contain_auto_increment)
      thd->last_insert_id= 0; // do not show last insert ID if VIEW have not it
unknown's avatar
unknown committed
3240
    break;
3241
  }
unknown's avatar
unknown committed
3242 3243 3244
  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
  {
unknown's avatar
unknown committed
3245
    select_result *result;
unknown's avatar
VIEW  
unknown committed
3246
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
3247
    if ((res= insert_precheck(thd, all_tables)))
3248
      break;
unknown's avatar
unknown committed
3249

3250
    /* Fix lock for first table */
unknown's avatar
VIEW  
unknown committed
3251 3252
    if (first_table->lock_type == TL_WRITE_DELAYED)
      first_table->lock_type= TL_WRITE;
3253

3254 3255
    /* Don't unlock tables until command is written to binary log */
    select_lex->options|= SELECT_NO_UNLOCK;
unknown's avatar
unknown committed
3256

3257
    unit->set_limit(select_lex);
unknown's avatar
VIEW  
unknown committed
3258
    if (!(res= open_and_lock_tables(thd, all_tables)))
3259
    {
3260
      /* Skip first table, which is the table we are inserting in */
unknown's avatar
unknown committed
3261 3262
      TABLE_LIST *second_table= first_table->next_local;
      select_lex->table_list.first= (byte*) second_table;
3263 3264
      select_lex->context.table_list= 
        select_lex->context.first_name_resolution_table= second_table;
3265 3266 3267
      res= mysql_insert_select_prepare(thd);
      if (!res && (result= new select_insert(first_table, first_table->table,
                                             &lex->field_list,
3268 3269
                                             &lex->update_list,
                                             &lex->value_list,
3270
                                             lex->duplicates, lex->ignore)))
3271
      {
unknown's avatar
unknown committed
3272 3273 3274 3275 3276 3277 3278
        /*
          Skip first table, which is the table we are inserting in.
          Below we set context.table_list again because the call above to
          mysql_insert_select_prepare() calls resolve_in_table_list_only(),
          which in turn resets context.table_list and
          context.first_name_resolution_table.
        */
3279 3280
        select_lex->context.table_list= 
          select_lex->context.first_name_resolution_table= second_table;
3281
	res= handle_select(thd, lex, result, OPTION_SETUP_TABLES_DONE);
3282 3283
        delete result;
      }
3284
      /* revert changes for SP */
unknown's avatar
unknown committed
3285
      select_lex->table_list.first= (byte*) first_table;
3286
    }
unknown's avatar
VIEW  
unknown committed
3287 3288 3289

    if (first_table->view && !first_table->contain_auto_increment)
      thd->last_insert_id= 0; // do not show last insert ID if VIEW have not it
unknown's avatar
unknown committed
3290 3291
    break;
  }
3292
  case SQLCOM_TRUNCATE:
3293 3294 3295 3296 3297
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
unknown's avatar
VIEW  
unknown committed
3298 3299
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_one_table_access(thd, DELETE_ACL, all_tables))
unknown's avatar
unknown committed
3300
      goto error;
3301 3302 3303 3304
    /*
      Don't allow this within a transaction because we want to use
      re-generate table
    */
3305
    if ((thd->locked_tables && !lex->sphead) || thd->active_transaction())
3306
    {
unknown's avatar
unknown committed
3307 3308
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3309 3310
      goto error;
    }
unknown's avatar
VIEW  
unknown committed
3311

unknown's avatar
unknown committed
3312
    res= mysql_truncate(thd, first_table, 0);
3313
    break;
unknown's avatar
unknown committed
3314
  case SQLCOM_DELETE:
unknown's avatar
unknown committed
3315
  {
unknown's avatar
VIEW  
unknown committed
3316 3317
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if ((res= delete_precheck(thd, all_tables)))
unknown's avatar
unknown committed
3318
      break;
3319 3320
    DBUG_ASSERT(select_lex->offset_limit == 0);
    unit->set_limit(select_lex);
unknown's avatar
VIEW  
unknown committed
3321
    res = mysql_delete(thd, all_tables, select_lex->where,
3322
                       &select_lex->order_list,
3323
                       unit->select_limit_cnt, select_lex->options);
unknown's avatar
unknown committed
3324 3325
    break;
  }
3326
  case SQLCOM_DELETE_MULTI:
unknown's avatar
unknown committed
3327
  {
unknown's avatar
VIEW  
unknown committed
3328
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3329 3330
    TABLE_LIST *aux_tables=
      (TABLE_LIST *)thd->lex->auxilliary_table_list.first;
unknown's avatar
unknown committed
3331
    multi_delete *result;
unknown's avatar
unknown committed
3332

3333
    if ((res= multi_delete_precheck(thd, all_tables)))
3334
      break;
unknown's avatar
unknown committed
3335

unknown's avatar
unknown committed
3336
    /* condition will be TRUE on SP re-excuting */
3337 3338
    if (select_lex->item_list.elements != 0)
      select_lex->item_list.empty();
unknown's avatar
unknown committed
3339
    if (add_item_to_list(thd, new Item_null()))
unknown's avatar
unknown committed
3340
      goto error;
3341

unknown's avatar
unknown committed
3342
    thd->proc_info="init";
unknown's avatar
VIEW  
unknown committed
3343 3344 3345 3346
    if ((res= open_and_lock_tables(thd, all_tables)))
      break;

    if ((res= mysql_multi_delete_prepare(thd)))
unknown's avatar
unknown committed
3347
      goto error;
3348

3349
    if (!thd->is_fatal_error && (result= new multi_delete(aux_tables,
3350
							  lex->table_count)))
unknown's avatar
unknown committed
3351
    {
3352 3353 3354
      res= mysql_select(thd, &select_lex->ref_pointer_array,
			select_lex->get_table_list(),
			select_lex->with_wild,
3355
			select_lex->item_list,
unknown's avatar
unknown committed
3356
			select_lex->where,
3357
			0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
unknown's avatar
unknown committed
3358 3359
			(ORDER *)NULL,
			select_lex->options | thd->options |
3360 3361
			SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK |
                        OPTION_SETUP_TABLES_DONE,
3362
			result, unit, select_lex);
3363
      delete result;
unknown's avatar
unknown committed
3364 3365
    }
    else
3366
      res= TRUE;                                // Error
unknown's avatar
unknown committed
3367 3368
    break;
  }
unknown's avatar
unknown committed
3369
  case SQLCOM_DROP_TABLE:
unknown's avatar
unknown committed
3370
  {
unknown's avatar
VIEW  
unknown committed
3371
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3372 3373
    if (!lex->drop_temporary)
    {
unknown's avatar
VIEW  
unknown committed
3374
      if (check_table_access(thd, DROP_ACL, all_tables, 0))
3375 3376
	goto error;				/* purecov: inspected */
      if (end_active_trans(thd))
unknown's avatar
unknown committed
3377
        goto error;
3378
    }
unknown's avatar
unknown committed
3379
    else
unknown's avatar
unknown committed
3380 3381 3382 3383 3384 3385
    {
      /*
	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
3386 3387
	To not generate such irrelevant "table does not exist errors",
	we silently add IF EXISTS if TEMPORARY was used.
unknown's avatar
unknown committed
3388 3389 3390
      */
      if (thd->slave_thread)
	lex->drop_if_exists= 1;
3391

unknown's avatar
unknown committed
3392 3393
      /* So that DROP TEMPORARY TABLE gets to binlog at commit/rollback */
      thd->options|= OPTION_STATUS_NO_TRANS_UPDATE;
unknown's avatar
unknown committed
3394
    }
unknown's avatar
VIEW  
unknown committed
3395 3396
    res= mysql_rm_table(thd, first_table, lex->drop_if_exists,
			lex->drop_temporary);
unknown's avatar
unknown committed
3397 3398
  }
  break;
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unknown committed
3399
  case SQLCOM_DROP_INDEX:
unknown's avatar
VIEW  
unknown committed
3400 3401
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_one_table_access(thd, INDEX_ACL, all_tables))
unknown's avatar
unknown committed
3402
      goto error;				/* purecov: inspected */
3403
    if (end_active_trans(thd))
unknown's avatar
unknown committed
3404
      goto error;
3405
    else
unknown's avatar
VIEW  
unknown committed
3406
      res = mysql_drop_index(thd, first_table, &lex->alter_info);
unknown's avatar
unknown committed
3407 3408
    break;
  case SQLCOM_SHOW_PROCESSLIST:
unknown's avatar
unknown committed
3409
    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
unknown's avatar
unknown committed
3410
      break;
unknown's avatar
unknown committed
3411 3412
    mysqld_list_processes(thd,
			  thd->master_access & PROCESS_ACL ? NullS :
unknown's avatar
unknown committed
3413
			  thd->priv_user,lex->verbose);
unknown's avatar
unknown committed
3414
    break;
unknown's avatar
unknown committed
3415 3416
  case SQLCOM_SHOW_STORAGE_ENGINES:
    res= mysqld_show_storage_engines(thd);
unknown's avatar
unknown committed
3417 3418 3419 3420 3421 3422 3423
    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
3424 3425
  case SQLCOM_SHOW_LOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
unknown's avatar
unknown committed
3426 3427
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0));	/* purecov: inspected */
3428
    goto error;
unknown's avatar
unknown committed
3429 3430
#else
    {
unknown's avatar
unknown committed
3431
      if (grant_option && check_access(thd, FILE_ACL, any_db,0,0,0))
unknown's avatar
unknown committed
3432 3433 3434 3435
	goto error;
      res= mysqld_show_logs(thd);
      break;
    }
unknown's avatar
unknown committed
3436 3437
#endif
  case SQLCOM_CHANGE_DB:
3438 3439
    if (!mysql_change_db(thd,select_lex->db,FALSE))
      send_ok(thd);
unknown's avatar
unknown committed
3440
    break;
3441

unknown's avatar
unknown committed
3442 3443
  case SQLCOM_LOAD:
  {
unknown's avatar
VIEW  
unknown committed
3444
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
3445
    uint privilege= (lex->duplicates == DUP_REPLACE ?
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unknown committed
3446 3447
		     INSERT_ACL | DELETE_ACL : INSERT_ACL) |
                    (lex->local_file ? 0 : FILE_ACL);
3448

unknown's avatar
unknown committed
3449
    if (lex->local_file)
unknown's avatar
unknown committed
3450
    {
3451
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
unknown's avatar
unknown committed
3452
	  ! opt_local_infile)
3453
      {
unknown's avatar
unknown committed
3454
	my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND), MYF(0));
3455 3456
	goto error;
      }
unknown's avatar
unknown committed
3457
    }
unknown's avatar
unknown committed
3458 3459 3460 3461

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

unknown's avatar
VIEW  
unknown committed
3462
    res= mysql_load(thd, lex->exchange, first_table, lex->field_list,
unknown's avatar
unknown committed
3463
                    lex->update_list, lex->value_list, lex->duplicates,
3464
                    lex->ignore, (bool) lex->local_file);
unknown's avatar
unknown committed
3465 3466
    break;
  }
3467

unknown's avatar
unknown committed
3468
  case SQLCOM_SET_OPTION:
3469 3470
  {
    List<set_var_base> *lex_var_list= &lex->var_list;
3471
    if ((check_table_access(thd, SELECT_ACL, all_tables, 0) ||
unknown's avatar
unknown committed
3472 3473
	 open_and_lock_tables(thd, all_tables)))
      goto error;
3474 3475
    if (lex->one_shot_set && not_all_support_one_shot(lex_var_list))
    {
unknown's avatar
unknown committed
3476 3477
      my_error(ER_RESERVED_SYNTAX, MYF(0), "SET ONE_SHOT");
      goto error;
3478 3479 3480 3481 3482 3483 3484 3485
    }
    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;
3486
      send_ok(thd);
3487
    }
unknown's avatar
unknown committed
3488
    break;
3489
  }
unknown's avatar
unknown committed
3490

unknown's avatar
unknown committed
3491
  case SQLCOM_UNLOCK_TABLES:
3492 3493 3494 3495 3496 3497
    /*
      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
3498
    unlock_locked_tables(thd);
unknown's avatar
unknown committed
3499 3500
    if (thd->options & OPTION_TABLE_LOCK)
    {
unknown's avatar
unknown committed
3501
      end_active_trans(thd);
unknown's avatar
unknown committed
3502
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
unknown's avatar
unknown committed
3503 3504
    }
    if (thd->global_read_lock)
3505
      unlock_global_read_lock(thd);
3506
    send_ok(thd);
unknown's avatar
unknown committed
3507 3508
    break;
  case SQLCOM_LOCK_TABLES:
unknown's avatar
unknown committed
3509
    unlock_locked_tables(thd);
unknown's avatar
VIEW  
unknown committed
3510
    if (check_db_used(thd, all_tables) || end_active_trans(thd))
unknown's avatar
unknown committed
3511
      goto error;
unknown's avatar
VIEW  
unknown committed
3512
    if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, all_tables, 0))
3513
      goto error;
unknown's avatar
unknown committed
3514
    thd->in_lock_tables=1;
unknown's avatar
unknown committed
3515
    thd->options|= OPTION_TABLE_LOCK;
unknown's avatar
VIEW  
unknown committed
3516

3517
    if (!(res= simple_open_n_lock_tables(thd, all_tables)))
unknown's avatar
unknown committed
3518
    {
3519 3520
#ifdef HAVE_QUERY_CACHE
      if (thd->variables.query_cache_wlock_invalidate)
unknown's avatar
VIEW  
unknown committed
3521
	query_cache.invalidate_locked_for_write(first_table);
3522
#endif /*HAVE_QUERY_CACHE*/
unknown's avatar
unknown committed
3523 3524
      thd->locked_tables=thd->lock;
      thd->lock=0;
3525
      send_ok(thd);
unknown's avatar
unknown committed
3526
    }
unknown's avatar
unknown committed
3527 3528
    else
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
unknown's avatar
unknown committed
3529 3530 3531
    thd->in_lock_tables=0;
    break;
  case SQLCOM_CREATE_DB:
3532
  {
3533 3534 3535 3536 3537
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
unknown's avatar
unknown committed
3538
    char *alias;
unknown's avatar
unknown committed
3539
    if (!(alias=thd->strdup(lex->name)) || check_db_name(lex->name))
unknown's avatar
unknown committed
3540
    {
3541
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
unknown's avatar
unknown committed
3542 3543
      break;
    }
3544 3545 3546
    /*
      If in a slave thread :
      CREATE DATABASE DB was certainly not preceded by USE DB.
3547
      For that reason, db_ok() in sql/slave.cc did not check the
3548 3549 3550
      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.
    */
3551
#ifdef HAVE_REPLICATION
3552
    if (thd->slave_thread &&
3553 3554
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
unknown's avatar
unknown committed
3555
    {
unknown's avatar
unknown committed
3556
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
3557
      break;
unknown's avatar
unknown committed
3558
    }
3559
#endif
unknown's avatar
unknown committed
3560
    if (check_access(thd,CREATE_ACL,lex->name,0,1,0))
3561
      break;
unknown's avatar
unknown committed
3562
    res= mysql_create_db(thd,(lower_case_table_names == 2 ? alias : lex->name),
unknown's avatar
unknown committed
3563
			 &lex->create_info, 0);
3564 3565
    break;
  }
unknown's avatar
unknown committed
3566
  case SQLCOM_DROP_DB:
3567
  {
3568 3569 3570 3571 3572
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
3573
    if (check_db_name(lex->name))
unknown's avatar
unknown committed
3574
    {
3575
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
unknown's avatar
unknown committed
3576 3577
      break;
    }
3578 3579 3580 3581 3582 3583 3584
    /*
      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.
    */
3585
#ifdef HAVE_REPLICATION
3586 3587 3588
    if (thd->slave_thread && 
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
unknown's avatar
unknown committed
3589
    {
unknown's avatar
unknown committed
3590
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
3591
      break;
unknown's avatar
unknown committed
3592
    }
3593
#endif
unknown's avatar
unknown committed
3594
    if (check_access(thd,DROP_ACL,lex->name,0,1,0))
3595
      break;
3596 3597
    if (thd->locked_tables || thd->active_transaction())
    {
unknown's avatar
unknown committed
3598 3599
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3600 3601
      goto error;
    }
3602
    res= mysql_rm_db(thd, lex->name, lex->drop_if_exists, 0);
3603 3604
    break;
  }
3605 3606
  case SQLCOM_ALTER_DB:
  {
3607 3608
    char *db= lex->name ? lex->name : thd->db;
    if (!db)
3609
    {
unknown's avatar
unknown committed
3610 3611
      my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
      break;
3612 3613
    }
    if (!strip_sp(db) || check_db_name(db))
3614
    {
3615
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
3616 3617
      break;
    }
unknown's avatar
unknown committed
3618 3619 3620
    /*
      If in a slave thread :
      ALTER DATABASE DB may not be preceded by USE DB.
3621
      For that reason, maybe db_ok() in sql/slave.cc did not check the
unknown's avatar
unknown committed
3622 3623 3624 3625
      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
3626
    if (thd->slave_thread &&
3627 3628
	(!db_ok(db, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(db)))
unknown's avatar
unknown committed
3629
    {
unknown's avatar
unknown committed
3630
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
unknown's avatar
unknown committed
3631 3632 3633
      break;
    }
#endif
3634
    if (check_access(thd, ALTER_ACL, db, 0, 1, 0))
3635 3636 3637
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
unknown's avatar
unknown committed
3638 3639
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3640 3641
      goto error;
    }
3642
    res= mysql_alter_db(thd, db, &lex->create_info);
3643 3644
    break;
  }
unknown's avatar
unknown committed
3645 3646 3647 3648
  case SQLCOM_SHOW_CREATE_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
3649
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
unknown's avatar
unknown committed
3650 3651
      break;
    }
unknown's avatar
unknown committed
3652
    if (check_access(thd,SELECT_ACL,lex->name,0,1,0))
unknown's avatar
unknown committed
3653
      break;
unknown's avatar
unknown committed
3654
    res=mysqld_show_create_db(thd,lex->name,&lex->create_info);
unknown's avatar
unknown committed
3655 3656
    break;
  }
unknown's avatar
unknown committed
3657
  case SQLCOM_CREATE_FUNCTION:                  // UDF function
unknown's avatar
unknown committed
3658 3659 3660
  {
    if (check_access(thd,INSERT_ACL,"mysql",0,1,0))
      break;
unknown's avatar
unknown committed
3661
#ifdef HAVE_DLOPEN
3662
    if (sp_find_function(thd, lex->spname))
unknown's avatar
unknown committed
3663
    {
3664
      my_error(ER_UDF_EXISTS, MYF(0), lex->spname->m_name.str);
unknown's avatar
unknown committed
3665 3666
      goto error;
    }
3667
    if (!(res = mysql_create_function(thd, &lex->udf)))
unknown's avatar
unknown committed
3668
      send_ok(thd);
unknown's avatar
unknown committed
3669
#else
unknown's avatar
unknown committed
3670
    my_error(ER_CANT_OPEN_LIBRARY, MYF(0), lex->udf.dl, 0, "feature disabled");
unknown's avatar
unknown committed
3671
    res= TRUE;
unknown's avatar
unknown committed
3672 3673
#endif
    break;
unknown's avatar
unknown committed
3674
  }
unknown's avatar
unknown committed
3675
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3676 3677
  case SQLCOM_CREATE_USER:
  {
3678 3679
    if (check_access(thd, INSERT_ACL, "mysql", 0, 1, 1) &&
        check_global_access(thd,CREATE_USER_ACL))
3680 3681 3682 3683 3684
      break;
    if (!(res= mysql_create_user(thd, lex->users_list)))
    {
      if (mysql_bin_log.is_open())
      {
unknown's avatar
unknown committed
3685
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3686 3687 3688 3689 3690 3691
        mysql_bin_log.write(&qinfo);
      }
      send_ok(thd);
    }
    break;
  }
3692 3693
  case SQLCOM_DROP_USER:
  {
3694 3695
    if (check_access(thd, DELETE_ACL, "mysql", 0, 1, 1) &&
        check_global_access(thd,CREATE_USER_ACL))
3696 3697 3698 3699 3700
      break;
    if (!(res= mysql_drop_user(thd, lex->users_list)))
    {
      if (mysql_bin_log.is_open())
      {
unknown's avatar
unknown committed
3701
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3702 3703 3704 3705 3706 3707 3708 3709
        mysql_bin_log.write(&qinfo);
      }
      send_ok(thd);
    }
    break;
  }
  case SQLCOM_RENAME_USER:
  {
3710 3711
    if (check_access(thd, UPDATE_ACL, "mysql", 0, 1, 1) &&
        check_global_access(thd,CREATE_USER_ACL))
3712 3713 3714 3715 3716
      break;
    if (!(res= mysql_rename_user(thd, lex->users_list)))
    {
      if (mysql_bin_log.is_open())
      {
unknown's avatar
unknown committed
3717
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3718
        mysql_bin_log.write(&qinfo);
3719 3720 3721 3722 3723 3724 3725
      }
      send_ok(thd);
    }
    break;
  }
  case SQLCOM_REVOKE_ALL:
  {
3726 3727
    if (check_access(thd, UPDATE_ACL, "mysql", 0, 1, 1) &&
        check_global_access(thd,CREATE_USER_ACL))
3728 3729 3730 3731 3732
      break;
    if (!(res = mysql_revoke_all(thd, lex->users_list)))
    {
      if (mysql_bin_log.is_open())
      {
3733
	Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3734 3735 3736 3737 3738 3739
	mysql_bin_log.write(&qinfo);
      }
      send_ok(thd);
    }
    break;
  }
3740 3741 3742 3743
  case SQLCOM_REVOKE:
  case SQLCOM_GRANT:
  {
    if (check_access(thd, lex->grant | lex->grant_tot_col | GRANT_ACL,
unknown's avatar
unknown committed
3744
		     first_table ?  first_table->db : select_lex->db,
unknown's avatar
VIEW  
unknown committed
3745 3746
		     first_table ? &first_table->grant.privilege : 0,
		     first_table ? 0 : 1, 0))
3747 3748
      goto error;

unknown's avatar
unknown committed
3749 3750 3751
    if (thd->user)				// If not replication
    {
      LEX_USER *user;
3752 3753
      uint counter;

unknown's avatar
unknown committed
3754
      List_iterator <LEX_USER> user_list(lex->users_list);
3755
      while ((user= user_list++))
unknown's avatar
unknown committed
3756
      {
3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777
        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);
        if (strcmp(thd->user, user->user.str) ||
            my_strcasecmp(system_charset_info,
                          user->host.str, thd->host_or_ip))
        {
          // TODO: use check_change_password()
          if (check_acl_user(user, &counter) && user->password.str &&
              check_access(thd, UPDATE_ACL,"mysql",0,1,1))
          {
            my_message(ER_PASSWORD_NOT_ALLOWED,
                       ER(ER_PASSWORD_NOT_ALLOWED), MYF(0));
            goto error;
          }
        }
unknown's avatar
SCRUM  
unknown committed
3778 3779
      }
    }
unknown's avatar
VIEW  
unknown committed
3780
    if (first_table)
3781
    {
3782 3783
      if (lex->type == TYPE_ENUM_PROCEDURE ||
          lex->type == TYPE_ENUM_FUNCTION)
3784 3785 3786 3787 3788
      {
        uint grants= lex->all_privileges 
		   ? (PROC_ACLS & ~GRANT_ACL) | (lex->grant & GRANT_ACL)
		   : lex->grant;
        if (grant_option && 
3789 3790
	    check_grant_routine(thd, grants | GRANT_ACL, all_tables,
                                lex->type == TYPE_ENUM_PROCEDURE, 0))
3791
	  goto error;
3792 3793 3794 3795
        res= mysql_routine_grant(thd, all_tables,
                                 lex->type == TYPE_ENUM_PROCEDURE, 
                                 lex->users_list, grants,
                                 lex->sql_command == SQLCOM_REVOKE, 0);
3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808
      }
      else
      {
	if (grant_option && check_grant(thd,
					(lex->grant | lex->grant_tot_col |
					 GRANT_ACL),
					all_tables, 0, UINT_MAX, 0))
	  goto error;
        res= mysql_table_grant(thd, all_tables, lex->users_list,
			       lex->columns, lex->grant,
			       lex->sql_command == SQLCOM_REVOKE);
      }
      if (!res && mysql_bin_log.is_open())
3809
      {
unknown's avatar
unknown committed
3810
        thd->clear_error();
unknown's avatar
unknown committed
3811
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3812
        mysql_bin_log.write(&qinfo);
3813 3814 3815 3816
      }
    }
    else
    {
3817
      if (lex->columns.elements || lex->type)
3818
      {
unknown's avatar
unknown committed
3819 3820
	my_message(ER_ILLEGAL_GRANT_FOR_TABLE, ER(ER_ILLEGAL_GRANT_FOR_TABLE),
                   MYF(0));
unknown's avatar
unknown committed
3821
        goto error;
3822 3823 3824 3825 3826 3827 3828 3829
      }
      else
	res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
			  lex->sql_command == SQLCOM_REVOKE);
      if (!res)
      {
	if (mysql_bin_log.is_open())
	{
unknown's avatar
unknown committed
3830
          thd->clear_error();
3831
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3832 3833
	  mysql_bin_log.write(&qinfo);
	}
3834
	if (lex->sql_command == SQLCOM_GRANT)
3835
	{
unknown's avatar
unknown committed
3836 3837 3838
	  List_iterator <LEX_USER> str_list(lex->users_list);
	  LEX_USER *user;
	  while ((user=str_list++))
unknown's avatar
unknown committed
3839
	    reset_mqh(user);
3840
	}
3841 3842 3843 3844
      }
    }
    break;
  }
unknown's avatar
SCRUM  
unknown committed
3845
#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/
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3846
  case SQLCOM_RESET:
3847 3848 3849
    /*
      RESET commands are never written to the binary log, so we have to
      initialize this variable because RESET shares the same code as FLUSH
3850 3851 3852 3853
    */
    lex->no_write_to_binlog= 1;
  case SQLCOM_FLUSH:
  {
unknown's avatar
unknown committed
3854
    bool write_to_binlog;
unknown's avatar
VIEW  
unknown committed
3855
    if (check_global_access(thd,RELOAD_ACL) || check_db_used(thd, all_tables))
unknown's avatar
unknown committed
3856
      goto error;
3857 3858 3859 3860
    /*
      reload_acl_and_cache() will tell us if we are allowed to write to the
      binlog or not.
    */
unknown's avatar
unknown committed
3861
    if (!reload_acl_and_cache(thd, lex->type, first_table, &write_to_binlog))
3862 3863 3864 3865 3866 3867 3868 3869 3870
    {
      /*
        We WANT to write and we CAN write.
        ! we write after unlocking the table.
      */
      if (!lex->no_write_to_binlog && write_to_binlog)
      {
        if (mysql_bin_log.is_open())
        {
3871
          Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3872 3873 3874 3875 3876
          mysql_bin_log.write(&qinfo);
        }
      }
      send_ok(thd);
    }
unknown's avatar
unknown committed
3877
    break;
3878
  }
unknown's avatar
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3879
  case SQLCOM_KILL:
3880 3881 3882
  {
    Item *it= (Item *)lex->value_list.head();

3883
    if ((!it->fixed && it->fix_fields(lex->thd, &it)) || it->check_cols(1))
3884 3885 3886 3887 3888 3889
    {
      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
unknown committed
3890
    break;
3891
  }
unknown's avatar
unknown committed
3892
#ifndef NO_EMBEDDED_ACCESS_CHECKS
unknown's avatar
unknown committed
3893
  case SQLCOM_SHOW_GRANTS:
3894 3895
    if ((thd->priv_user &&
	 !strcmp(thd->priv_user,lex->grant_user->user.str)) ||
unknown's avatar
unknown committed
3896
	!check_access(thd, SELECT_ACL, "mysql",0,1,0))
unknown's avatar
unknown committed
3897 3898 3899 3900
    {
      res = mysql_show_grants(thd,lex->grant_user);
    }
    break;
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3901
#endif
3902
  case SQLCOM_HA_OPEN:
unknown's avatar
VIEW  
unknown committed
3903 3904 3905
    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))
3906
      goto error;
unknown's avatar
unknown committed
3907
    res= mysql_ha_open(thd, first_table, 0);
3908 3909
    break;
  case SQLCOM_HA_CLOSE:
unknown's avatar
VIEW  
unknown committed
3910 3911
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables))
3912
      goto error;
unknown's avatar
VIEW  
unknown committed
3913
    res= mysql_ha_close(thd, first_table);
3914 3915
    break;
  case SQLCOM_HA_READ:
unknown's avatar
VIEW  
unknown committed
3916
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3917 3918 3919 3920 3921
    /*
      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
3922
    if (check_db_used(thd, all_tables))
3923
      goto error;
3924
    unit->set_limit(select_lex);
3925
    res= mysql_ha_read(thd, first_table, lex->ha_read_mode, lex->ident.str,
unknown's avatar
VIEW  
unknown committed
3926
                       lex->insert_list, lex->ha_rkey_mode, select_lex->where,
3927
                       unit->select_limit_cnt, unit->offset_limit_cnt);
3928 3929
    break;

unknown's avatar
unknown committed
3930
  case SQLCOM_BEGIN:
unknown's avatar
unknown committed
3931
    if (begin_trans(thd))
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unknown committed
3932
      goto error;
unknown's avatar
unknown committed
3933
    send_ok(thd);
unknown's avatar
unknown committed
3934 3935
    break;
  case SQLCOM_COMMIT:
3936
    if (end_trans(thd, lex->tx_release ? COMMIT_RELEASE :
unknown's avatar
unknown committed
3937
                              lex->tx_chain ? COMMIT_AND_CHAIN : COMMIT))
unknown's avatar
unknown committed
3938
      goto error;
3939
    send_ok(thd);
unknown's avatar
unknown committed
3940 3941
    break;
  case SQLCOM_ROLLBACK:
3942
    if (end_trans(thd, lex->tx_release ? ROLLBACK_RELEASE :
unknown's avatar
unknown committed
3943
                              lex->tx_chain ? ROLLBACK_AND_CHAIN : ROLLBACK))
unknown's avatar
unknown committed
3944
      goto error;
3945
    send_ok(thd);
unknown's avatar
unknown committed
3946
    break;
unknown's avatar
unknown committed
3947
  case SQLCOM_RELEASE_SAVEPOINT:
unknown's avatar
unknown committed
3948
  {
3949 3950
    SAVEPOINT *sv;
    for (sv=thd->transaction.savepoints; sv; sv=sv->prev)
unknown's avatar
unknown committed
3951 3952 3953
    {
      if (my_strnncoll(system_charset_info,
                       (uchar *)lex->ident.str, lex->ident.length,
3954
                       (uchar *)sv->name, sv->length) == 0)
unknown's avatar
unknown committed
3955 3956
        break;
    }
3957
    if (sv)
unknown's avatar
unknown committed
3958
    {
3959
      if (ha_release_savepoint(thd, sv))
unknown's avatar
unknown committed
3960
        res= TRUE; // cannot happen
unknown's avatar
unknown committed
3961 3962
      else
        send_ok(thd);
3963
      thd->transaction.savepoints=sv->prev;
unknown's avatar
unknown committed
3964
    }
3965
    else
unknown's avatar
unknown committed
3966
      my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str);
unknown's avatar
unknown committed
3967
    break;
unknown's avatar
unknown committed
3968
  }
unknown's avatar
unknown committed
3969
  case SQLCOM_ROLLBACK_TO_SAVEPOINT:
unknown's avatar
unknown committed
3970
  {
3971 3972
    SAVEPOINT *sv;
    for (sv=thd->transaction.savepoints; sv; sv=sv->prev)
3973 3974 3975
    {
      if (my_strnncoll(system_charset_info,
                       (uchar *)lex->ident.str, lex->ident.length,
3976
                       (uchar *)sv->name, sv->length) == 0)
3977 3978
        break;
    }
3979
    if (sv)
3980
    {
3981
      if (ha_rollback_to_savepoint(thd, sv))
3982 3983
        res= TRUE; // cannot happen
      else
unknown's avatar
unknown committed
3984 3985 3986 3987 3988 3989 3990 3991
      {
        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);
      }
3992
      thd->transaction.savepoints=sv;
unknown's avatar
unknown committed
3993 3994
    }
    else
3995
      my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str);
unknown's avatar
unknown committed
3996
    break;
3997
  }
3998
  case SQLCOM_SAVEPOINT:
3999 4000
    if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) ||
        !opt_using_transactions)
unknown's avatar
unknown committed
4001
      send_ok(thd);
unknown's avatar
unknown committed
4002
    else
4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040
    {
      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);
      }
    }
unknown's avatar
unknown committed
4041
    break;
4042 4043
  case SQLCOM_CREATE_PROCEDURE:
  case SQLCOM_CREATE_SPFUNCTION:
unknown's avatar
unknown committed
4044
  {
4045
    uint namelen;
4046
    char *name, *db;
unknown's avatar
unknown committed
4047
    int result;
4048

4049
    DBUG_ASSERT(lex->sphead != 0);
4050

4051
    if (check_access(thd, CREATE_PROC_ACL, lex->sphead->m_db.str, 0, 0, 0))
4052 4053 4054 4055 4056 4057
    {
      delete lex->sphead;
      lex->sphead= 0;
      goto error;
    }

4058 4059 4060
    if (!lex->sphead->m_db.str || !lex->sphead->m_db.str[0])
    {
      lex->sphead->m_db.length= strlen(thd->db);
unknown's avatar
unknown committed
4061 4062
      lex->sphead->m_db.str= strmake_root(thd->mem_root, thd->db,
                                           lex->sphead->m_db.length);
4063
    }
4064 4065

    name= lex->sphead->name(&namelen);
4066
#ifdef HAVE_DLOPEN
unknown's avatar
unknown committed
4067 4068 4069
    if (lex->sphead->m_type == TYPE_ENUM_FUNCTION)
    {
      udf_func *udf = find_udf(name, namelen);
4070

unknown's avatar
unknown committed
4071
      if (udf)
4072
      {
4073
	my_error(ER_UDF_EXISTS, MYF(0), name);
unknown's avatar
unknown committed
4074
	delete lex->sphead;
4075
	lex->sphead= 0;
4076
	goto error;
4077
      }
unknown's avatar
unknown committed
4078 4079 4080 4081 4082
    }
#endif
    if (lex->sphead->m_type == TYPE_ENUM_FUNCTION &&
	!lex->sphead->m_has_return)
    {
4083
      my_error(ER_SP_NORETURN, MYF(0), name);
unknown's avatar
unknown committed
4084
      delete lex->sphead;
4085
      lex->sphead= 0;
unknown's avatar
unknown committed
4086 4087 4088
      goto error;
    }

4089 4090
    name= thd->strdup(name); 
    db= thd->strmake(lex->sphead->m_db.str, lex->sphead->m_db.length);
unknown's avatar
unknown committed
4091
    res= (result= lex->sphead->create(thd));
unknown's avatar
unknown committed
4092 4093
    if (result == SP_OK)
    {
4094
      lex->unit.cleanup();
unknown's avatar
unknown committed
4095 4096
      delete lex->sphead;
      lex->sphead= 0;
unknown's avatar
unknown committed
4097
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4098
      /* only add privileges if really neccessary */
4099
      if (sp_automatic_privileges && !opt_noacl &&
4100 4101 4102
          check_routine_access(thd, DEFAULT_CREATE_PROC_ACLS,
      			       db, name,
                               lex->sql_command == SQLCOM_CREATE_PROCEDURE, 1))
4103 4104
      {
        close_thread_tables(thd);
4105 4106
        if (sp_grant_privileges(thd, db, name, 
                                lex->sql_command == SQLCOM_CREATE_PROCEDURE))
4107 4108 4109 4110
          push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 
	  	       ER_PROC_AUTO_GRANT_FAIL,
		       ER(ER_PROC_AUTO_GRANT_FAIL));
      }
unknown's avatar
unknown committed
4111
#endif
4112
      send_ok(thd);
unknown's avatar
unknown committed
4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132
    }
    else
    {
      switch (result) {
      case SP_WRITE_ROW_FAILED:
	my_error(ER_SP_ALREADY_EXISTS, MYF(0), SP_TYPE_STRING(lex), name);
	break;
      case SP_NO_DB_ERROR:
	my_error(ER_BAD_DB_ERROR, MYF(0), lex->sphead->m_db.str);
	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;
      }
4133
      lex->unit.cleanup();
unknown's avatar
unknown committed
4134 4135 4136
      delete lex->sphead;
      lex->sphead= 0;
      goto error;
4137
    }
unknown's avatar
unknown committed
4138 4139
    break;
  }
4140 4141 4142 4143
  case SQLCOM_CALL:
    {
      sp_head *sp;

4144 4145 4146 4147 4148 4149 4150 4151 4152
      /*
        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;

      /*
4153 4154
        By this moment all needed SPs should be in cache so no need to look 
        into DB. 
4155 4156
      */
      if (!(sp= sp_find_procedure(thd, lex->spname, TRUE)))
4157
      {
4158
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "PROCEDURE",
unknown's avatar
unknown committed
4159
                 lex->spname->m_qname.str);
4160
	goto error;
4161 4162 4163
      }
      else
      {
4164
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4165
	st_sp_security_context save_ctx;
4166
#endif
unknown's avatar
unknown committed
4167
	ha_rows select_limit;
unknown's avatar
unknown committed
4168 4169
        /* bits that should be cleared in thd->server_status */
	uint bits_to_be_cleared= 0;
4170

4171
#ifndef EMBEDDED_LIBRARY
4172 4173
	my_bool nsok= thd->net.no_send_ok;
	thd->net.no_send_ok= TRUE;
4174
#endif
4175
	if (sp->m_multi_results)
4176
	{
4177
	  if (! (thd->client_capabilities & CLIENT_MULTI_RESULTS))
4178
	  {
4179
	    my_error(ER_SP_BADSELECT, MYF(0), sp->m_qname.str);
4180 4181 4182 4183 4184
#ifndef EMBEDDED_LIBRARY
	    thd->net.no_send_ok= nsok;
#endif
	    goto error;
	  }
unknown's avatar
unknown committed
4185 4186 4187 4188 4189 4190 4191
          /*
            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;
4192 4193
	}

4194
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4195 4196
	if (check_routine_access(thd, EXECUTE_ACL, 
				 sp->m_db.str, sp->m_name.str, TRUE, 0))
4197 4198 4199 4200 4201 4202
	{
#ifndef EMBEDDED_LIBRARY
	  thd->net.no_send_ok= nsok;
#endif
	  goto error;
	}
4203
	sp_change_security_context(thd, sp, &save_ctx);
4204
	if (save_ctx.changed && 
4205 4206
	    check_routine_access(thd, EXECUTE_ACL, 
				   sp->m_db.str, sp->m_name.str, TRUE, 0))
4207 4208 4209 4210 4211 4212 4213 4214
	{
#ifndef EMBEDDED_LIBRARY
	  thd->net.no_send_ok= nsok;
#endif
	  sp_restore_security_context(thd, sp, &save_ctx);
	  goto error;
	}

4215
#endif
unknown's avatar
unknown committed
4216 4217
	select_limit= thd->variables.select_limit;
	thd->variables.select_limit= HA_POS_ERROR;
4218

4219
        thd->row_count_func= 0;
4220
        tmp_disable_binlog(thd); /* don't binlog the substatements */
4221
	res= sp->execute_procedure(thd, &lex->value_list);
4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254 4255 4256
        reenable_binlog(thd);

        /*
          We write CALL to binlog; on the opposite we didn't write the
          substatements. That choice is necessary because the substatements
          may use local vars.
          Binlogging should happen when all tables are locked. They are locked
          just above, and unlocked by close_thread_tables(). All tables which
          are to be updated are locked like with a table-level write lock, and
          this also applies to InnoDB (I tested - note that it reduces
          InnoDB's concurrency as we don't use row-level locks). So binlogging
          below is safe.
          Note the limitation: if the SP returned an error, but still did some
          updates, we do NOT binlog it. This is because otherwise "permission
          denied", "table does not exist" etc would stop the slave quite
          often. There is no easy way to know if the SP updated something
          (even no_trans_update is not suitable, as it may be a transactional
          autocommit update which happened, and no_trans_update covers only
          INSERT/UPDATE/LOAD).
        */
        if (mysql_bin_log.is_open() &&
            (sp->m_chistics->daccess == SP_CONTAINS_SQL ||
             sp->m_chistics->daccess == SP_MODIFIES_SQL_DATA))
        {
          if (res)
            push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                         ER_FAILED_ROUTINE_BREAK_BINLOG,
			 ER(ER_FAILED_ROUTINE_BREAK_BINLOG));
          else
          {
            thd->clear_error();
            Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
            mysql_bin_log.write(&qinfo);
          }
        }
4257

4258 4259 4260
	/*
          If warnings have been cleared, we have to clear total_warn_count
          too, otherwise the clients get confused.
4261 4262 4263 4264
	 */
	if (thd->warn_list.is_empty())
	  thd->total_warn_count= 0;

unknown's avatar
unknown committed
4265
	thd->variables.select_limit= select_limit;
4266
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4267
	sp_restore_security_context(thd, sp, &save_ctx);
4268
#endif
4269

4270
#ifndef EMBEDDED_LIBRARY
4271
	thd->net.no_send_ok= nsok;
4272
#endif
unknown's avatar
unknown committed
4273
        thd->server_status&= ~bits_to_be_cleared;
4274

unknown's avatar
unknown committed
4275
	if (!res)
unknown's avatar
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4276 4277
	  send_ok(thd, (ulong) (thd->row_count_func < 0 ? 0 :
                                thd->row_count_func));
4278 4279
	else
	  goto error;		// Substatement should already have sent error
4280
      }
4281
      break;
4282 4283
    }
  case SQLCOM_ALTER_PROCEDURE:
4284
  case SQLCOM_ALTER_FUNCTION:
4285
    {
unknown's avatar
unknown committed
4286
      int result;
4287 4288 4289 4290
      sp_head *sp;
      st_sp_chistics chistics;

      memcpy(&chistics, &lex->sp_chistics, sizeof(chistics));
unknown's avatar
unknown committed
4291
      if (lex->sql_command == SQLCOM_ALTER_PROCEDURE)
4292
	sp= sp_find_procedure(thd, lex->spname);
4293
      else
4294
	sp= sp_find_function(thd, lex->spname);
unknown's avatar
unknown committed
4295
      mysql_reset_errors(thd, 0);
4296
      if (! sp)
4297 4298 4299 4300 4301 4302 4303 4304 4305
      {
	if (lex->spname->m_db.str)
	  result= SP_KEY_NOT_FOUND;
	else
	{
	  my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
	  goto error;
	}
      }
4306 4307
      else
      {
4308 4309 4310
        if (check_routine_access(thd, ALTER_PROC_ACL, sp->m_db.str, 
				 sp->m_name.str,
                                 lex->sql_command == SQLCOM_ALTER_PROCEDURE, 0))
4311
	  goto error;
4312
	memcpy(&lex->sp_chistics, &chistics, sizeof(lex->sp_chistics));
4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328
        if (!trust_routine_creators &&  mysql_bin_log.is_open() &&
            !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));
          result= SP_INTERNAL_ERROR;
        }
        else
        {
          if (lex->sql_command == SQLCOM_ALTER_PROCEDURE)
            result= sp_update_procedure(thd, lex->spname, &lex->sp_chistics);
          else
            result= sp_update_function(thd, lex->spname, &lex->sp_chistics);
        }
4329
      }
unknown's avatar
unknown committed
4330
      switch (result)
4331
      {
unknown's avatar
unknown committed
4332
      case SP_OK:
4333 4334 4335 4336 4337 4338
        if (mysql_bin_log.is_open())
        {
          thd->clear_error();
          Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
          mysql_bin_log.write(&qinfo);
        }
4339
	send_ok(thd);
unknown's avatar
unknown committed
4340 4341
	break;
      case SP_KEY_NOT_FOUND:
4342 4343
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
unknown's avatar
unknown committed
4344 4345
	goto error;
      default:
4346 4347
	my_error(ER_SP_CANT_ALTER, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
unknown's avatar
unknown committed
4348
	goto error;
4349
      }
4350
      break;
4351 4352
    }
  case SQLCOM_DROP_PROCEDURE:
4353
  case SQLCOM_DROP_FUNCTION:
4354
    {
4355
      sp_head *sp;
unknown's avatar
unknown committed
4356
      int result;
4357
      char *db, *name;
4358

4359
      if (lex->sql_command == SQLCOM_DROP_PROCEDURE)
4360 4361 4362
	sp= sp_find_procedure(thd, lex->spname);
      else
	sp= sp_find_function(thd, lex->spname);
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unknown committed
4363
      mysql_reset_errors(thd, 0);
4364
      if (sp)
4365
      {
4366 4367
        db= thd->strdup(sp->m_db.str);
	name= thd->strdup(sp->m_name.str);
4368 4369
	if (check_routine_access(thd, ALTER_PROC_ACL, db, name,
                                 lex->sql_command == SQLCOM_DROP_PROCEDURE, 0))
unknown's avatar
merge  
unknown committed
4370
          goto error;
unknown's avatar
unknown committed
4371
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4372
	if (sp_automatic_privileges && !opt_noacl &&
4373 4374
	    sp_revoke_privileges(thd, db, name, 
                                 lex->sql_command == SQLCOM_DROP_PROCEDURE))
4375 4376 4377 4378 4379
	{
	  push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 
		       ER_PROC_AUTO_REVOKE_FAIL,
		       ER(ER_PROC_AUTO_REVOKE_FAIL));
	}
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4380
#endif
4381
	if (lex->sql_command == SQLCOM_DROP_PROCEDURE)
unknown's avatar
merge  
unknown committed
4382
	  result= sp_drop_procedure(thd, lex->spname);
4383
	else
unknown's avatar
merge  
unknown committed
4384
	  result= sp_drop_function(thd, lex->spname);
4385 4386 4387
      }
      else
      {
4388
#ifdef HAVE_DLOPEN
4389 4390 4391 4392 4393 4394 4395 4396 4397
	if (lex->sql_command == SQLCOM_DROP_FUNCTION)
	{
          udf_func *udf = find_udf(lex->spname->m_name.str,
                                   lex->spname->m_name.length);
          if (udf)
          {
	    if (check_access(thd, DELETE_ACL, "mysql", 0, 1, 0))
	      goto error;
	    if (!(res = mysql_drop_function(thd, &lex->spname->m_name)))
4398
	    {
4399 4400
	      send_ok(thd);
	      break;
4401 4402
	    }
	  }
4403
	}
4404
#endif
4405 4406 4407 4408 4409 4410 4411
	if (lex->spname->m_db.str)
	  result= SP_KEY_NOT_FOUND;
	else
	{
	  my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
	  goto error;
	}
4412
      }
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unknown committed
4413 4414
      res= result;
      switch (result)
4415 4416
      {
      case SP_OK:
4417 4418 4419 4420 4421 4422
        if (mysql_bin_log.is_open())
        {
          thd->clear_error();
          Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
          mysql_bin_log.write(&qinfo);
        }
4423
	send_ok(thd);
4424 4425
	break;
      case SP_KEY_NOT_FOUND:
4426 4427
	if (lex->drop_if_exists)
	{
4428
	  push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
4429
			      ER_SP_DOES_NOT_EXIST, ER(ER_SP_DOES_NOT_EXIST),
4430
			      SP_COM_STRING(lex), lex->spname->m_name.str);
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unknown committed
4431
	  res= FALSE;
4432 4433 4434
	  send_ok(thd);
	  break;
	}
4435 4436
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4437 4438
	goto error;
      default:
4439 4440
	my_error(ER_SP_DROP_FAILED, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4441
	goto error;
4442
      }
4443
      break;
4444
    }
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unknown committed
4445 4446
  case SQLCOM_SHOW_CREATE_PROC:
    {
4447
      if (lex->spname->m_name.length > NAME_LEN)
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unknown committed
4448
      {
4449
	my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str);
unknown's avatar
unknown committed
4450 4451
	goto error;
      }
unknown's avatar
unknown committed
4452
      if (sp_show_create_procedure(thd, lex->spname) != SP_OK)
4453
      {			/* We don't distinguish between errors for now */
4454 4455
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
unknown's avatar
unknown committed
4456 4457 4458 4459 4460 4461
	goto error;
      }
      break;
    }
  case SQLCOM_SHOW_CREATE_FUNC:
    {
4462
      if (lex->spname->m_name.length > NAME_LEN)
unknown's avatar
unknown committed
4463
      {
4464
	my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str);
unknown's avatar
unknown committed
4465 4466
	goto error;
      }
unknown's avatar
unknown committed
4467
      if (sp_show_create_function(thd, lex->spname) != SP_OK)
4468
      {			/* We don't distinguish between errors for now */
4469 4470
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
unknown's avatar
unknown committed
4471 4472 4473 4474 4475 4476
	goto error;
      }
      break;
    }
  case SQLCOM_SHOW_STATUS_PROC:
    {
4477
      res= sp_show_status_procedure(thd, (lex->wild ?
unknown's avatar
unknown committed
4478 4479 4480 4481 4482
					  lex->wild->ptr() : NullS));
      break;
    }
  case SQLCOM_SHOW_STATUS_FUNC:
    {
4483
      res= sp_show_status_function(thd, (lex->wild ? 
unknown's avatar
unknown committed
4484 4485 4486
					 lex->wild->ptr() : NullS));
      break;
    }
unknown's avatar
VIEW  
unknown committed
4487 4488
  case SQLCOM_CREATE_VIEW:
    {
4489 4490 4491
      if (!(res= mysql_create_view(thd, thd->lex->create_view_mode)) &&
          mysql_bin_log.is_open())
      {
unknown's avatar
unknown committed
4492
        thd->clear_error();
4493 4494 4495
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
        mysql_bin_log.write(&qinfo);
      }
unknown's avatar
VIEW  
unknown committed
4496 4497 4498 4499
      break;
    }
  case SQLCOM_DROP_VIEW:
    {
unknown's avatar
unknown committed
4500 4501 4502
      if (check_table_access(thd, DROP_ACL, all_tables, 0) ||
          end_active_trans(thd))
        goto error;
4503 4504 4505
      if (!(res= mysql_drop_view(thd, first_table, thd->lex->drop_mode)) &&
          mysql_bin_log.is_open())
      {
unknown's avatar
unknown committed
4506
        thd->clear_error();
4507 4508 4509
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
        mysql_bin_log.write(&qinfo);
      }
unknown's avatar
VIEW  
unknown committed
4510 4511
      break;
    }
4512 4513
  case SQLCOM_CREATE_TRIGGER:
  {
4514 4515 4516
    res= mysql_create_or_drop_trigger(thd, all_tables, 1);

    /* We don't care about trigger body after this point */
4517 4518 4519 4520 4521 4522 4523 4524 4525
    delete lex->sphead;
    lex->sphead= 0;
    break;
  }
  case SQLCOM_DROP_TRIGGER:
  {
    res= mysql_create_or_drop_trigger(thd, all_tables, 0);
    break;
  }
4526
  case SQLCOM_XA_START:
4527 4528
    if (thd->transaction.xid_state.xa_state == XA_IDLE &&
        thd->lex->xa_opt == XA_RESUME)
4529
    {
4530
      if (! thd->transaction.xid_state.xid.eq(thd->lex->xid))
4531 4532 4533 4534
      {
        my_error(ER_XAER_NOTA, MYF(0));
        break;
      }
4535
      thd->transaction.xid_state.xa_state=XA_ACTIVE;
4536 4537 4538
      send_ok(thd);
      break;
    }
unknown's avatar
unknown committed
4539
    if (thd->lex->xa_opt != XA_NONE)
4540 4541 4542 4543
    { // JOIN is not supported yet. TODO
      my_error(ER_XAER_INVAL, MYF(0));
      break;
    }
4544
    if (thd->transaction.xid_state.xa_state != XA_NOTR)
4545
    {
unknown's avatar
unknown committed
4546
      my_error(ER_XAER_RMFAIL, MYF(0),
4547
               xa_state_names[thd->transaction.xid_state.xa_state]);
4548 4549 4550 4551 4552 4553 4554
      break;
    }
    if (thd->active_transaction() || thd->locked_tables)
    {
      my_error(ER_XAER_OUTSIDE, MYF(0));
      break;
    }
4555 4556 4557 4558 4559 4560 4561 4562 4563
    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);
4564 4565 4566 4567 4568 4569 4570 4571 4572 4573 4574 4575
    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;
    }
4576
    if (thd->transaction.xid_state.xa_state != XA_ACTIVE)
4577
    {
unknown's avatar
unknown committed
4578
      my_error(ER_XAER_RMFAIL, MYF(0),
4579
               xa_state_names[thd->transaction.xid_state.xa_state]);
4580 4581
      break;
    }
4582
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
4583 4584 4585 4586
    {
      my_error(ER_XAER_NOTA, MYF(0));
      break;
    }
4587
    thd->transaction.xid_state.xa_state=XA_IDLE;
4588 4589 4590
    send_ok(thd);
    break;
  case SQLCOM_XA_PREPARE:
4591
    if (thd->transaction.xid_state.xa_state != XA_IDLE)
4592
    {
unknown's avatar
unknown committed
4593
      my_error(ER_XAER_RMFAIL, MYF(0),
4594
               xa_state_names[thd->transaction.xid_state.xa_state]);
4595 4596
      break;
    }
4597
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
4598 4599 4600 4601 4602 4603 4604
    {
      my_error(ER_XAER_NOTA, MYF(0));
      break;
    }
    if (ha_prepare(thd))
    {
      my_error(ER_XA_RBROLLBACK, MYF(0));
4605 4606
      xid_cache_delete(&thd->transaction.xid_state);
      thd->transaction.xid_state.xa_state=XA_NOTR;
4607 4608
      break;
    }
4609
    thd->transaction.xid_state.xa_state=XA_PREPARED;
4610 4611 4612
    send_ok(thd);
    break;
  case SQLCOM_XA_COMMIT:
4613
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
4614
    {
4615 4616
      XID_STATE *xs=xid_cache_search(thd->lex->xid);
      if (!xs || xs->in_thd)
4617
        my_error(ER_XAER_NOTA, MYF(0));
unknown's avatar
unknown committed
4618
      else
4619 4620 4621
      {
        ha_commit_or_rollback_by_xid(thd->lex->xid, 1);
        xid_cache_delete(xs);
unknown's avatar
unknown committed
4622
        send_ok(thd);
4623
      }
4624 4625
      break;
    }
4626
    if (thd->transaction.xid_state.xa_state == XA_IDLE &&
unknown's avatar
unknown committed
4627
        thd->lex->xa_opt == XA_ONE_PHASE)
4628
    {
unknown's avatar
unknown committed
4629 4630 4631
      int r;
      if ((r= ha_commit(thd)))
        my_error(r == 1 ? ER_XA_RBROLLBACK : ER_XAER_RMERR, MYF(0));
4632 4633 4634
      else
        send_ok(thd);
    }
4635
    else if (thd->transaction.xid_state.xa_state == XA_PREPARED &&
unknown's avatar
unknown committed
4636
             thd->lex->xa_opt == XA_NONE)
4637
    {
4638 4639 4640
      if (wait_if_global_read_lock(thd, 0, 0))
      {
        ha_rollback(thd);
4641
        my_error(ER_XAER_RMERR, MYF(0));
4642
      }
4643
      else
4644 4645 4646 4647 4648 4649 4650
      {
        if (ha_commit_one_phase(thd, 1))
          my_error(ER_XAER_RMERR, MYF(0));
        else
          send_ok(thd);
        start_waiting_global_read_lock(thd);
      }
4651 4652 4653
    }
    else
    {
unknown's avatar
unknown committed
4654
      my_error(ER_XAER_RMFAIL, MYF(0),
4655
               xa_state_names[thd->transaction.xid_state.xa_state]);
4656 4657 4658 4659
      break;
    }
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
4660 4661
    xid_cache_delete(&thd->transaction.xid_state);
    thd->transaction.xid_state.xa_state=XA_NOTR;
4662 4663
    break;
  case SQLCOM_XA_ROLLBACK:
4664
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
4665
    {
4666 4667
      XID_STATE *xs=xid_cache_search(thd->lex->xid);
      if (!xs || xs->in_thd)
4668
        my_error(ER_XAER_NOTA, MYF(0));
unknown's avatar
unknown committed
4669
      else
4670 4671 4672
      {
        ha_commit_or_rollback_by_xid(thd->lex->xid, 0);
        xid_cache_delete(xs);
unknown's avatar
unknown committed
4673
        send_ok(thd);
4674
      }
4675 4676
      break;
    }
4677 4678
    if (thd->transaction.xid_state.xa_state != XA_IDLE &&
        thd->transaction.xid_state.xa_state != XA_PREPARED)
4679
    {
unknown's avatar
unknown committed
4680
      my_error(ER_XAER_RMFAIL, MYF(0),
4681
               xa_state_names[thd->transaction.xid_state.xa_state]);
4682 4683 4684 4685 4686 4687 4688 4689
      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;
4690 4691
    xid_cache_delete(&thd->transaction.xid_state);
    thd->transaction.xid_state.xa_state=XA_NOTR;
4692 4693
    break;
  case SQLCOM_XA_RECOVER:
4694
    res= mysql_xa_recover(thd);
4695 4696 4697
    break;
  default:
    DBUG_ASSERT(0);                             /* Impossible */
4698
    send_ok(thd);
unknown's avatar
unknown committed
4699 4700
    break;
  }
unknown's avatar
unknown committed
4701
  thd->proc_info="query end";
4702
  /* Two binlog-related cleanups: */
4703
  if (thd->one_shot_set)
unknown's avatar
unknown committed
4704 4705 4706 4707 4708 4709 4710 4711
  {
    /*
      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 (lex->sql_command != SQLCOM_SET_OPTION)
4712
    {
unknown's avatar
unknown committed
4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723 4724
      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;
      thd->one_shot_set= 0;
4725
    }
unknown's avatar
unknown committed
4726
  }
4727

4728 4729 4730 4731 4732
  /*
    The return value for ROW_COUNT() is "implementation dependent" if
    the statement is not DELETE, INSERT or UPDATE (or a CALL executing
    such a statement), but -1 is what JDBC and ODBC wants.
   */
4733
  if (lex->sql_command != SQLCOM_CALL && uc_update_queries[lex->sql_command]<2)
4734
    thd->row_count_func= -1;
unknown's avatar
unknown committed
4735
  goto cleanup;
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unknown committed
4736 4737

error:
unknown's avatar
unknown committed
4738
  res= 1;
4739

unknown's avatar
unknown committed
4740
cleanup:
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4741 4742 4743 4744 4745 4746 4747 4748
  if (unlikely(slave_fake_lock))
  {
    DBUG_PRINT("info",("undoing faked lock"));
    thd->lock= thd->locked_tables;
    thd->locked_tables= fake_prev_lock;
    if (thd->lock == thd->locked_tables)
      thd->lock= 0;
  }
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unknown committed
4749
  DBUG_RETURN(res || thd->net.report_error);
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4750 4751 4752
}


unknown's avatar
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4753 4754
/*
  Check grants for commands which work only with one table and all other
4755
  tables belonging to subselects or implicitly opened tables.
unknown's avatar
unknown committed
4756

4757
  SYNOPSIS
unknown's avatar
unknown committed
4758 4759
    check_one_table_access()
    thd			Thread handler
4760
    privilege		requested privilege
unknown's avatar
VIEW  
unknown committed
4761
    all_tables		global table list of query
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4762 4763 4764

  RETURN
    0 - OK
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4765
    1 - access denied, error is sent to client
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4766 4767
*/

4768
bool check_one_table_access(THD *thd, ulong privilege, TABLE_LIST *all_tables)
unknown's avatar
unknown committed
4769
{
unknown's avatar
VIEW  
unknown committed
4770 4771
  if (check_access(thd, privilege, all_tables->db,
		   &all_tables->grant.privilege, 0, 0))
unknown's avatar
unknown committed
4772
    return 1;
unknown's avatar
unknown committed
4773

unknown's avatar
unknown committed
4774
  /* Show only 1 table for check_grant */
unknown's avatar
VIEW  
unknown committed
4775
  if (grant_option && check_grant(thd, privilege, all_tables, 0, 1, 0))
unknown's avatar
unknown committed
4776
    return 1;
unknown's avatar
unknown committed
4777

4778
  /* Check rights on tables of subselects and implictly opened tables */
unknown's avatar
unknown committed
4779
  TABLE_LIST *subselects_tables;
unknown's avatar
VIEW  
unknown committed
4780
  if ((subselects_tables= all_tables->next_global))
unknown's avatar
unknown committed
4781
  {
unknown's avatar
VIEW  
unknown committed
4782
    if ((check_table_access(thd, SELECT_ACL, subselects_tables, 0)))
unknown's avatar
unknown committed
4783 4784 4785
      return 1;
  }
  return 0;
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4786 4787 4788
}


unknown's avatar
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4789
/****************************************************************************
unknown's avatar
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4790
  Get the user (global) and database privileges for all used tables
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unknown committed
4791 4792 4793 4794 4795 4796 4797 4798 4799 4800 4801 4802 4803

  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
unknown's avatar
unknown committed
4804 4805
                is enough to satisfy the request and the global grants contains
                a SELECT grant.
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4806 4807 4808
****************************************************************************/

bool
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4809
check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
4810
	     bool dont_check_global_grants, bool no_errors)
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{
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
  ulong db_access;
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  bool  db_is_pattern= test(want_access & GRANT_ACL);
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#endif
  ulong dummy;
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  DBUG_ENTER("check_access");
  DBUG_PRINT("enter",("db: %s  want_access: %lu  master_access: %lu",
                      db ? db : "", want_access, thd->master_access));
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  if (save_priv)
    *save_priv=0;
  else
    save_priv= &dummy;

4825
  if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
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  {
4827
    DBUG_PRINT("error",("No database"));
4828
    if (!no_errors)
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      my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR),
                 MYF(0));                       /* purecov: tested */
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    DBUG_RETURN(TRUE);				/* purecov: tested */
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  }

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#ifdef NO_EMBEDDED_ACCESS_CHECKS
  DBUG_RETURN(0);
#else
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  if ((thd->master_access & want_access) == want_access)
  {
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    /*
      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
    */
    db_access= thd->db_access;
    if (!(thd->master_access & SELECT_ACL) &&
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	(db && (!thd->db || db_is_pattern || strcmp(db,thd->db))))
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      db_access=acl_get(thd->host, thd->ip, thd->priv_user, db, db_is_pattern);
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    *save_priv=thd->master_access | db_access;
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    DBUG_RETURN(FALSE);
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  }
4851
  if (((want_access & ~thd->master_access) & ~(DB_ACLS | EXTRA_ACL)) ||
4852
      ! db && dont_check_global_grants)
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  {						// We can never grant this
4854
    DBUG_PRINT("error",("No possible access"));
4855
    if (!no_errors)
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      my_error(ER_ACCESS_DENIED_ERROR, MYF(0),
               thd->priv_user,
               thd->priv_host,
               (thd->password ?
                ER(ER_YES) :
                ER(ER_NO)));                    /* purecov: tested */
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    DBUG_RETURN(TRUE);				/* purecov: tested */
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  }

  if (db == any_db)
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    DBUG_RETURN(FALSE);				// Allow select on anything
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  if (db && (!thd->db || db_is_pattern || strcmp(db,thd->db)))
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    db_access=acl_get(thd->host, thd->ip, thd->priv_user, db, db_is_pattern);
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  else
    db_access=thd->db_access;
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  DBUG_PRINT("info",("db_access: %lu", db_access));
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  /* Remove SHOW attribute and access rights we already have */
4874
  want_access &= ~(thd->master_access | EXTRA_ACL);
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  DBUG_PRINT("info",("db_access: %lu  want_access: %lu",
                     db_access, want_access));
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  db_access= ((*save_priv=(db_access | thd->master_access)) & want_access);
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  /* grant_option is set if there exists a single table or column grant */
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  if (db_access == want_access ||
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      (grant_option && !dont_check_global_grants &&
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       !(want_access & ~(db_access | TABLE_ACLS | PROC_ACLS))))
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    DBUG_RETURN(FALSE);				/* Ok */
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  DBUG_PRINT("error",("Access denied"));
4886
  if (!no_errors)
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    my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
             thd->priv_user,
             thd->priv_host,
             (db ? db : (thd->db ?
                         thd->db :
                         "unknown")));          /* purecov: tested */
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  DBUG_RETURN(TRUE);				/* purecov: tested */
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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}


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/*
  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
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    One gets access right if one has ANY of the rights in want_access
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    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
*/
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bool check_global_access(THD *thd, ulong want_access)
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{
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#ifdef NO_EMBEDDED_ACCESS_CHECKS
  return 0;
#else
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  char command[128];
4923
  if ((thd->master_access & want_access))
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    return 0;
  get_privilege_desc(command, sizeof(command), want_access);
4926
  my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), command);
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  return 1;
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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}


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/*
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  Check the privilege for all used tables.  Table privileges are cached
  in the table list for GRANT checking
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*/

4937
bool
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check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables,
4939
		   bool no_errors)
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{
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  uint found=0;
  ulong found_access=0;
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  TABLE_LIST *org_tables=tables;
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VIEW  
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  for (; tables; tables= tables->next_global)
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  {
4946
    if (tables->derived || tables->schema_table || tables->belong_to_view ||
4947
        (tables->table && (int)tables->table->s->tmp_table) ||
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        my_tz_check_n_skip_implicit_tables(&tables,
                                           thd->lex->time_zone_tables_used))
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      continue;
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    if ((thd->master_access & want_access) == (want_access & ~EXTRA_ACL) &&
	thd->db)
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      tables->grant.privilege= want_access;
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    else if (tables->db && tables->db == thd->db)
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    {
      if (found && !grant_option)		// db already checked
	tables->grant.privilege=found_access;
      else
      {
4960 4961
	if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
			 0, no_errors))
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	  return TRUE;				// Access denied
	found_access=tables->grant.privilege;
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	found=1;
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      }
    }
4967
    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
4968
			  0, no_errors))
4969
      return TRUE;
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  }
  if (grant_option)
4972
    return check_grant(thd,want_access & ~EXTRA_ACL,org_tables,
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		       test(want_access & EXTRA_ACL), UINT_MAX, no_errors);
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  return FALSE;
}

4977

4978
bool
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check_routine_access(THD *thd, ulong want_access,char *db, char *name,
		     bool is_proc, bool no_errors)
4981 4982 4983 4984 4985
{
  TABLE_LIST tables[1];
  
  bzero((char *)tables, sizeof(TABLE_LIST));
  tables->db= db;
4986
  tables->table_name= tables->alias= name;
4987 4988 4989 4990 4991 4992 4993
  
  if ((thd->master_access & want_access) == want_access && !thd->db)
    tables->grant.privilege= want_access;
  else if (check_access(thd,want_access,db,&tables->grant.privilege,
			0, no_errors))
    return TRUE;
  
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
4995
  if (grant_option)
4996
    return check_grant_routine(thd, want_access, tables, is_proc, no_errors);
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#endif
4998 4999 5000 5001

  return FALSE;
}

5002 5003 5004 5005 5006 5007 5008 5009 5010 5011 5012 5013 5014 5015 5016

/*
  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
*/

5017 5018
bool check_some_routine_access(THD *thd, const char *db, const char *name,
                               bool is_proc)
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{
  ulong save_priv;
  if (thd->master_access & SHOW_PROC_ACLS)
    return FALSE;
  if (!check_access(thd, SHOW_PROC_ACLS, db, &save_priv, 0, 1) ||
      (save_priv & SHOW_PROC_ACLS))
    return FALSE;
5026
  return check_routine_level_acl(thd, db, name, is_proc);
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}


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/*
  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,
                        &table->grant.privilege, 0, 1) &&
          !grant_option || !check_grant(thd, access, table, 0, 1, 1))
        DBUG_RETURN(0);
    }
  }
  DBUG_PRINT("exit",("no matching access rights"));
  DBUG_RETURN(1);
}


5065 5066
bool check_merge_table_access(THD *thd, char *db,
			      TABLE_LIST *table_list)
5067 5068 5069 5070
{
  int error=0;
  if (table_list)
  {
5071
    /* Check that all tables use the current database */
5072
    TABLE_LIST *tmp;
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    for (tmp= table_list; tmp; tmp= tmp->next_local)
5074 5075 5076 5077
    {
      if (!tmp->db || !tmp->db[0])
	tmp->db=db;
    }
5078
    error=check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
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			     table_list,0);
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  }
  return error;
}

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static bool check_db_used(THD *thd,TABLE_LIST *tables)
{
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  for (; tables; tables= tables->next_global)
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  {
    if (!tables->db)
    {
      if (!(tables->db=thd->db))
      {
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	my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR),
                   MYF(0));                     /* purecov: tested */
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	return TRUE;				/* purecov: tested */
      }
    }
  }
  return FALSE;
}
5101

5102

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/****************************************************************************
	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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#ifndef DBUG_OFF
long max_stack_used;
#endif

5117
#ifndef EMBEDDED_LIBRARY
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/*
  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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{
  long stack_used;
  if ((stack_used=used_stack(thd->thread_stack,(char*) &stack_used)) >=
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      (long) (thread_stack - margin))
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  {
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    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));
5134
    thd->fatal_error();
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    return 1;
  }
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#ifndef DBUG_OFF
  max_stack_used= max(max_stack_used, stack_used);
#endif
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  return 0;
}
5142
#endif /* EMBEDDED_LIBRARY */
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#define MY_YACC_INIT 1000			// Start with big alloc
#define MY_YACC_MAX  32000			// Because of 'short'

5147
bool my_yyoverflow(short **yyss, YYSTYPE **yyvs, ulong *yystacksize)
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{
  LEX	*lex=current_lex;
5150
  ulong old_info=0;
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  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;
}


/****************************************************************************
5177
  Initialize global thd variables needed for query
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****************************************************************************/

5180
void
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mysql_init_query(THD *thd, uchar *buf, uint length)
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{
  DBUG_ENTER("mysql_init_query");
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  lex_start(thd, buf, length);
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  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");
5206
  thd->free_list= 0;
5207
  thd->select_number= 1;
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  thd->last_insert_id_used= thd->query_start_used= thd->insert_id_used=0;
5209
  thd->is_fatal_error= thd->time_zone_used= 0;
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  thd->server_status&= ~ (SERVER_MORE_RESULTS_EXISTS | 
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                          SERVER_QUERY_NO_INDEX_USED |
                          SERVER_QUERY_NO_GOOD_INDEX_USED);
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  thd->tmp_table_used= 0;
5214 5215
  if (!thd->in_sub_stmt)
  {
5216 5217 5218
    if (opt_bin_log)
      reset_dynamic(&thd->user_var_events);
    thd->clear_error();
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    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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  DBUG_VOID_RETURN;
}

5226

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void
mysql_init_select(LEX *lex)
{
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  SELECT_LEX *select_lex= lex->current_select;
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  select_lex->init_select();
5232
  lex->wild= 0;
5233 5234
  if (select_lex == &lex->select_lex)
  {
5235
    DBUG_ASSERT(lex->result == 0);
5236 5237
    lex->exchange= 0;
  }
5238 5239
}

5240

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bool
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mysql_new_select(LEX *lex, bool move_down)
5243
{
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  SELECT_LEX *select_lex;
5245
  THD *thd= lex->thd;
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  DBUG_ENTER("mysql_new_select");

5248
  if (!(select_lex= new (thd->mem_root) SELECT_LEX()))
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    DBUG_RETURN(1);
5250
  select_lex->select_number= ++thd->select_number;
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  select_lex->parent_lex= lex; /* Used in init_query. */
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  select_lex->init_query();
  select_lex->init_select();
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  /*
    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.
  */
5259 5260
  if (thd->current_arena->is_stmt_prepare())
    select_lex->uncacheable|= UNCACHEABLE_PREPARE;
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  if (move_down)
  {
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    SELECT_LEX_UNIT *unit;
5264
    lex->subqueries= TRUE;
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    /* first select_lex of subselect or derived table */
5266
    if (!(unit= new (thd->mem_root) SELECT_LEX_UNIT()))
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      DBUG_RETURN(1);
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    unit->init_query();
    unit->init_select();
5271
    unit->thd= thd;
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    unit->include_down(lex->current_select);
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    unit->link_next= 0;
    unit->link_prev= 0;
5275
    unit->return_to= lex->current_select;
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    select_lex->include_down(unit);
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    /*
      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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  {
5285
    Name_resolution_context *outer_context;
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    if (lex->current_select->order_list.first && !lex->current_select->braces)
    {
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      my_error(ER_WRONG_USAGE, MYF(0), "UNION", "ORDER BY");
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      DBUG_RETURN(1);
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    }
5291
    select_lex->include_neighbour(lex->current_select);
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    /*
      we are not sure that we have one level of SELECTs above, so we take
      outer_context address from first select of unit
    */
    outer_context=
      select_lex->master_unit()->first_select()->context.outer_context;
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    SELECT_LEX_UNIT *unit= select_lex->master_unit();
    SELECT_LEX *fake= unit->fake_select_lex;
    if (!fake)
    {
      /*
	as far as we included SELECT_LEX for UNION unit should have
	fake SELECT_LEX for UNION processing
      */
5306
      if (!(fake= unit->fake_select_lex= new (thd->mem_root) SELECT_LEX()))
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        DBUG_RETURN(1);
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      fake->include_standalone(unit,
			       (SELECT_LEX_NODE**)&unit->fake_select_lex);
      fake->select_number= INT_MAX;
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      fake->parent_lex= lex; /* Used in init_query. */
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      fake->make_empty_select();
      fake->linkage= GLOBAL_OPTIONS_TYPE;
5314
      fake->select_limit= 0;
5315 5316 5317 5318 5319

      fake->context.outer_context= outer_context;
      /* allow item list resolving in fake select for ORDER BY */
      fake->context.resolve_in_select_list= TRUE;
      fake->context.select_lex= fake;
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      /*
        Remove the name resolution context of the fake select from the
        context stack.
       */
      lex->pop_context();
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    }
5326
    select_lex->context.outer_context= outer_context;
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  }
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5329
  select_lex->master_unit()->global_parameters= select_lex;
5330
  select_lex->include_global((st_select_lex_node**)&lex->all_selects_list);
5331
  lex->current_select= select_lex;
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  /*
    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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  DBUG_RETURN(0);
5338
}
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5339

5340 5341 5342 5343 5344 5345 5346 5347 5348 5349 5350 5351 5352 5353 5354
/*
  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)
{
5355
  THD *thd;
5356
  LEX *lex;
5357
  LEX_STRING tmp, null_lex_string;
5358 5359
  Item *var;
  char buff[MAX_SYS_VAR_LENGTH*2+4+8], *end;
5360
  DBUG_ENTER("create_select_for_variable");
5361 5362

  thd= current_thd;
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  lex= thd->lex;
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  mysql_init_select(lex);
  lex->sql_command= SQLCOM_SELECT;
  tmp.str= (char*) var_name;
  tmp.length=strlen(var_name);
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  bzero((char*) &null_lex_string.str, sizeof(null_lex_string));
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  /*
    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);
  }
5379 5380 5381
  DBUG_VOID_RETURN;
}

5382

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void mysql_init_multi_delete(LEX *lex)
{
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  lex->sql_command=  SQLCOM_DELETE_MULTI;
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  mysql_init_select(lex);
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  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->auxilliary_table_list);
5390
  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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5394

5395

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/*
  When you modify mysql_parse(), you may need to mofify
  mysql_test_parse_for_slave() in this same file.
*/
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5401
void mysql_parse(THD *thd, char *inBuf, uint length)
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{
  DBUG_ENTER("mysql_parse");
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  mysql_init_query(thd, (uchar*) inBuf, length);
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  if (query_cache_send_result_to_client(thd, inBuf, length) <= 0)
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  {
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    LEX *lex= thd->lex;
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    sp_cache_flush_obsolete(&thd->sp_proc_cache);
    sp_cache_flush_obsolete(&thd->sp_func_cache);
5410
    if (!yyparse((void *)thd) && ! thd->is_fatal_error)
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    {
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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      if (mqh_used && thd->user_connect &&
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	  check_mqh(thd, lex->sql_command))
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      {
	thd->net.error = 0;
      }
      else
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#endif
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      {
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	if (thd->net.report_error)
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	{
	  if (thd->lex->sphead)
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	  {
	    delete thd->lex->sphead;
	    thd->lex->sphead= NULL;
	  }
5428
	}
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	else
	{
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          /*
            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)))
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            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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	}
5448
      }
5449
      lex->unit.cleanup();
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    }
    else
5452 5453
    {
      DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
5454
			 thd->is_fatal_error));
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5455
      query_cache_abort(&thd->net);
5456
      lex->unit.cleanup();
5457
      if (thd->lex->sphead)
5458
      {
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	/* Clean up after failed stored procedure/function */
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	delete thd->lex->sphead;
	thd->lex->sphead= NULL;
      }
5463
    }
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    thd->proc_info="freeing items";
5465
    thd->end_statement();
5466
    thd->cleanup_after_query();
5467
    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;
5486
  bool error= 0;
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  DBUG_ENTER("mysql_test_parse_for_slave");
5488

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  mysql_init_query(thd, (uchar*) inBuf, length);
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  if (!yyparse((void*) thd) && ! thd->is_fatal_error &&
5491
      all_tables_not_ok(thd,(TABLE_LIST*) lex->select_lex.table_list.first))
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    error= 1;                  /* Ignore question */
5493
  thd->end_statement();
5494
  thd->cleanup_after_query();
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  DBUG_RETURN(error);
5496
}
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#endif
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5498

5499

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5500

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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,
5508
		       uint type_modifier,
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		       Item *default_value, Item *on_update_value,
                       LEX_STRING *comment,
5511 5512
		       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)
  {
5521
    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));
5527
    lex->key_list.push_back(new Key(Key::PRIMARY, NullS, HA_KEY_ALG_UNDEF,
5528
				    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));
5534
    lex->key_list.push_back(new Key(Key::UNIQUE, NullS, HA_KEY_ALG_UNDEF, 0,
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				    lex->col_list));
    lex->col_list.empty();
  }

5539
  if (default_value)
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5540
  {
5541
    /* 
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5542 5543
      Default value should be literal => basic constants =>
      no need fix_fields()
5544 5545 5546
      
      We allow only one function as part of default value - 
      NOW() as default for TIMESTAMP type.
5547
    */
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    if (default_value->type() == Item::FUNC_ITEM && 
        !(((Item_func*)default_value)->functype() == Item_func::NOW_FUNC &&
         type == FIELD_TYPE_TIMESTAMP))
5551
    {
5552
      my_error(ER_INVALID_DEFAULT, MYF(0), field_name);
5553 5554 5555
      DBUG_RETURN(1);
    }
    else if (default_value->type() == Item::NULL_ITEM)
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5556
    {
5557
      default_value= 0;
5558 5559 5560
      if ((type_modifier & (NOT_NULL_FLAG | AUTO_INCREMENT_FLAG)) ==
	  NOT_NULL_FLAG)
      {
5561
	my_error(ER_INVALID_DEFAULT, MYF(0), field_name);
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	DBUG_RETURN(1);
      }
    }
    else if (type_modifier & AUTO_INCREMENT_FLAG)
    {
5567
      my_error(ER_INVALID_DEFAULT, MYF(0), field_name);
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      DBUG_RETURN(1);
    }
  }
5571 5572 5573

  if (on_update_value && type != FIELD_TYPE_TIMESTAMP)
  {
5574
    my_error(ER_INVALID_ON_UPDATE, MYF(0), field_name);
5575 5576
    DBUG_RETURN(1);
  }
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5577

5578 5579 5580 5581 5582 5583
  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];
    my_snprintf(buf, sizeof(buf),
                "TIMESTAMP(%s)", length, system_charset_info);
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    push_warning_printf(thd,MYSQL_ERROR::WARN_LEVEL_WARN,
                        ER_WARN_DEPRECATED_SYNTAX,
                        ER(ER_WARN_DEPRECATED_SYNTAX),
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                        buf, "TIMESTAMP");
5591 5592
  }

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  if (!(new_field= new_create_field(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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  lex->create_list.push_back(new_field);
  lex->last_field=new_field;
  DBUG_RETURN(0);
}

/*****************************************************************************
** Create field definition for create
** Return 0 on failure, otherwise return create_field instance
******************************************************************************/
  
create_field *
new_create_field(THD *thd, char *field_name, enum_field_types type,
		 char *length, char *decimals,
		 uint type_modifier, 
		 Item *default_value, Item *on_update_value,
		 LEX_STRING *comment,
		 char *change, List<String> *interval_list, CHARSET_INFO *cs,
		 uint uint_geom_type)
{
  register create_field *new_field;
  uint sign_len, allowed_type_modifier=0;
  ulong max_field_charlength= MAX_FIELD_CHARLENGTH;
  DBUG_ENTER("new_create_field");
  
  if (!(new_field=new create_field()))
    DBUG_RETURN(NULL);
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  new_field->field=0;
  new_field->field_name=field_name;
5626
  new_field->def= default_value;
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  new_field->flags= type_modifier;
  new_field->unireg_check= (type_modifier & AUTO_INCREMENT_FLAG ?
			    Field::NEXT_NUMBER : Field::NONE);
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  new_field->decimals= decimals ? (uint)atoi(decimals) : 0;
  if (new_field->decimals >= NOT_FIXED_DEC)
  {
    my_error(ER_TOO_BIG_SCALE, MYF(0), new_field->decimals, field_name,
             NOT_FIXED_DEC-1);
    DBUG_RETURN(NULL);
  }

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  new_field->sql_type=type;
  new_field->length=0;
  new_field->change=change;
  new_field->interval=0;
5642
  new_field->pack_length= new_field->key_length= 0;
5643
  new_field->charset=cs;
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5644
  new_field->geom_type= (Field::geometry_type) uint_geom_type;
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5645

5646
  new_field->comment=*comment;
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  /*
    Set flag if this field doesn't have a default value
  */
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5650
  if (!default_value && !(type_modifier & AUTO_INCREMENT_FLAG) &&
5651
      (type_modifier & NOT_NULL_FLAG) && type != FIELD_TYPE_TIMESTAMP)
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5652 5653
    new_field->flags|= NO_DEFAULT_VALUE_FLAG;

5654 5655
  if (length && !(new_field->length= (uint) atoi(length)))
    length=0; /* purecov: inspected */
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5656
  sign_len=type_modifier & UNSIGNED_FLAG ? 0 : 1;
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  switch (type) {
  case FIELD_TYPE_TINY:
5660
    if (!length) new_field->length=MAX_TINYINT_WIDTH+sign_len;
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    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_SHORT:
5664
    if (!length) new_field->length=MAX_SMALLINT_WIDTH+sign_len;
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    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_INT24:
5668
    if (!length) new_field->length=MAX_MEDIUMINT_WIDTH+sign_len;
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    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_LONG:
5672
    if (!length) new_field->length=MAX_INT_WIDTH+sign_len;
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    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_LONGLONG:
5676
    if (!length) new_field->length=MAX_BIGINT_WIDTH;
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    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_NULL:
    break;
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5681
  case FIELD_TYPE_NEWDECIMAL:
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5682
    if (!length)
5683 5684
      new_field->length= 10;
    if (new_field->length > DECIMAL_MAX_PRECISION)
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    {
5686 5687 5688
      my_error(ER_TOO_BIG_PRECISION, MYF(0), new_field->length, field_name,
               DECIMAL_MAX_PRECISION);
      DBUG_RETURN(NULL);
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5689
    }
5690
    if (new_field->length < new_field->decimals)
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5691
    {
5692 5693
      my_error(ER_SCALE_BIGGER_THAN_PRECISION, MYF(0), field_name);
      DBUG_RETURN(NULL);
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    }
5695 5696 5697 5698 5699 5700
    new_field->length=
      my_decimal_precision_to_length(new_field->length, new_field->decimals,
                                     type_modifier & UNSIGNED_FLAG);
    new_field->pack_length=
      my_decimal_get_binary_size(new_field->length, new_field->decimals);
    break;
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  case MYSQL_TYPE_VARCHAR:
    /*
      Long VARCHAR's are automaticly converted to blobs in mysql_prepare_table
      if they don't have a default value
    */
    max_field_charlength= MAX_FIELD_VARCHARLENGTH;
    break;
  case MYSQL_TYPE_STRING:
    break;
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  case FIELD_TYPE_BLOB:
  case FIELD_TYPE_TINY_BLOB:
  case FIELD_TYPE_LONG_BLOB:
  case FIELD_TYPE_MEDIUM_BLOB:
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  case FIELD_TYPE_GEOMETRY:
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    if (default_value)				// Allow empty as default value
    {
      String str,*res;
      res=default_value->val_str(&str);
      if (res->length())
      {
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	my_error(ER_BLOB_CANT_HAVE_DEFAULT, MYF(0),
                 field_name); /* purecov: inspected */
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	DBUG_RETURN(NULL);
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      }
      new_field->def=0;
    }
    new_field->flags|=BLOB_FLAG;
    break;
  case FIELD_TYPE_YEAR:
    if (!length || new_field->length != 2)
      new_field->length=4;			// Default length
    new_field->flags|= ZEROFILL_FLAG | UNSIGNED_FLAG;
    break;
  case FIELD_TYPE_FLOAT:
    /* change FLOAT(precision) to FLOAT or DOUBLE */
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    if (length && !decimals)
    {
      uint tmp_length=new_field->length;
      if (tmp_length > PRECISION_FOR_DOUBLE)
      {
5742
	my_error(ER_WRONG_FIELD_SPEC, MYF(0), field_name);
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	DBUG_RETURN(NULL);
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      }
      else if (tmp_length > PRECISION_FOR_FLOAT)
      {
	new_field->sql_type=FIELD_TYPE_DOUBLE;
	new_field->length=DBL_DIG+7;			// -[digits].E+###
      }
      else
	new_field->length=FLT_DIG+6;			// -[digits].E+##
      new_field->decimals= NOT_FIXED_DEC;
      break;
    }
    if (!length)
    {
      new_field->length =  FLT_DIG+6;
      new_field->decimals= NOT_FIXED_DEC;
    }
    break;
  case FIELD_TYPE_DOUBLE:
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    if (!length)
    {
      new_field->length = DBL_DIG+7;
      new_field->decimals=NOT_FIXED_DEC;
    }
    break;
  case FIELD_TYPE_TIMESTAMP:
    if (!length)
      new_field->length= 14;			// Full date YYYYMMDDHHMMSS
5772
    else if (new_field->length != 19)
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    {
5774 5775 5776 5777
      /*
        We support only even TIMESTAMP lengths less or equal than 14
        and 19 as length of 4.1 compatible representation.
      */
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      new_field->length=((new_field->length+1)/2)*2; /* purecov: inspected */
      new_field->length= min(new_field->length,14); /* purecov: inspected */
    }
5781
    new_field->flags|= ZEROFILL_FLAG | UNSIGNED_FLAG;
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    if (default_value)
    {
      /* Grammar allows only NOW() value for ON UPDATE clause */
      if (default_value->type() == Item::FUNC_ITEM && 
          ((Item_func*)default_value)->functype() == Item_func::NOW_FUNC)
      {
        new_field->unireg_check= (on_update_value?Field::TIMESTAMP_DNUN_FIELD:
                                                  Field::TIMESTAMP_DN_FIELD);
        /*
          We don't need default value any longer moreover it is dangerous.
          Everything handled by unireg_check further.
        */
        new_field->def= 0;
      }
      else
        new_field->unireg_check= (on_update_value?Field::TIMESTAMP_UN_FIELD:
                                                  Field::NONE);
    }
    else
    {
5802 5803 5804 5805 5806 5807 5808 5809
      /*
        If we have default TIMESTAMP NOT NULL column without explicit DEFAULT
        or ON UPDATE values then for the sake of compatiblity we should treat
        this column as having DEFAULT NOW() ON UPDATE NOW() (when we don't
        have another TIMESTAMP column with auto-set option before this one)
        or DEFAULT 0 (in other cases).
        So here we are setting TIMESTAMP_OLD_FIELD only temporary, and will
        replace this value by TIMESTAMP_DNUN_FIELD or NONE later when
5810
        information about all TIMESTAMP fields in table will be availiable.
5811 5812 5813

        If we have TIMESTAMP NULL column without explicit DEFAULT value
        we treat it as having DEFAULT NULL attribute.
5814
      */
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      new_field->unireg_check= (on_update_value ?
                                Field::TIMESTAMP_UN_FIELD :
                                (new_field->flags & NOT_NULL_FLAG ?
                                 Field::TIMESTAMP_OLD_FIELD:
                                 Field::NONE));
5820
    }
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    break;
  case FIELD_TYPE_DATE:				// Old date type
    if (protocol_version != PROTOCOL_VERSION-1)
      new_field->sql_type=FIELD_TYPE_NEWDATE;
    /* fall trough */
  case FIELD_TYPE_NEWDATE:
    new_field->length=10;
    break;
  case FIELD_TYPE_TIME:
    new_field->length=10;
    break;
  case FIELD_TYPE_DATETIME:
    new_field->length=19;
    break;
  case FIELD_TYPE_SET:
    {
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      if (interval_list->elements > sizeof(longlong)*8)
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      {
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	my_error(ER_TOO_BIG_SET, MYF(0), field_name); /* purecov: inspected */
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	DBUG_RETURN(NULL);
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      }
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      new_field->pack_length= get_set_pack_length(interval_list->elements);
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      List_iterator<String> it(*interval_list);
      String *tmp;
      while ((tmp= it++))
        new_field->interval_list.push_back(tmp);
      /*
        Set fake length to 1 to pass the below conditions.
        Real length will be set in mysql_prepare_table()
        when we know the character set of the column
      */
      new_field->length= 1;
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      break;
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    }
  case FIELD_TYPE_ENUM:
    {
5858
      // Should be safe
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      new_field->pack_length= get_enum_pack_length(interval_list->elements);
5860

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      List_iterator<String> it(*interval_list);
      String *tmp;
      while ((tmp= it++))
        new_field->interval_list.push_back(tmp);
      new_field->length= 1; // See comment for FIELD_TYPE_SET above.
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      break;
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   }
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  case MYSQL_TYPE_VAR_STRING:
    DBUG_ASSERT(0);                             // Impossible
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    break;
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  case MYSQL_TYPE_BIT:
    {
      if (!length)
        new_field->length= 1;
      if (new_field->length > MAX_BIT_FIELD_LENGTH)
      {
5877
        my_error(ER_TOO_BIG_DISPLAYWIDTH, MYF(0), field_name,
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                 MAX_BIT_FIELD_LENGTH);
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        DBUG_RETURN(NULL);
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      }
      new_field->pack_length= (new_field->length + 7) / 8;
      break;
    }
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  case FIELD_TYPE_DECIMAL:
    DBUG_ASSERT(0); /* Was obsolete */
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  }

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  if (!(new_field->flags & BLOB_FLAG) &&
      ((new_field->length > max_field_charlength && type != FIELD_TYPE_SET && 
        type != FIELD_TYPE_ENUM &&
        (type != MYSQL_TYPE_VARCHAR || default_value)) ||
       (!new_field->length &&
        type != MYSQL_TYPE_STRING &&
        type != MYSQL_TYPE_VARCHAR && type != FIELD_TYPE_GEOMETRY)))
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  {
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    my_error((type == MYSQL_TYPE_VAR_STRING || type == MYSQL_TYPE_VARCHAR ||
              type == MYSQL_TYPE_STRING) ?  ER_TOO_BIG_FIELDLENGTH :
             ER_TOO_BIG_DISPLAYWIDTH,
             MYF(0),
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             field_name, max_field_charlength); /* purecov: inspected */
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    DBUG_RETURN(NULL);
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  }
  type_modifier&= AUTO_INCREMENT_FLAG;
  if ((~allowed_type_modifier) & type_modifier)
  {
5906
    my_error(ER_WRONG_FIELD_SPEC, MYF(0), field_name);
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    DBUG_RETURN(NULL);
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  }
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  DBUG_RETURN(new_field);
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}

5912

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

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

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)
{
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  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;
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    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;
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  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
    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,
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					     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;
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  LEX *lex= thd->lex;
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  DBUG_ENTER("add_table_to_list");
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  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;
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  if (check_table_name(table->table.str,table->table.length) ||
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      table->db.str && check_db_name(table->db.str))
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  {
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    my_error(ER_WRONG_TABLE_NAME, MYF(0), table->table.str);
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    DBUG_RETURN(0);
  }

  if (!alias)					/* Alias is case sensitive */
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  {
    if (table->sel)
    {
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      my_message(ER_DERIVED_MUST_HAVE_ALIAS,
                 ER(ER_DERIVED_MUST_HAVE_ALIAS), MYF(0));
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      DBUG_RETURN(0);
    }
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    if (!(alias_str=thd->memdup(alias_str,table->table.length+1)))
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      DBUG_RETURN(0);
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  }
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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)
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  {
    ptr->db= table->db.str;
    ptr->db_length= table->db.length;
  }
  else if (thd->db)
  {
    ptr->db= thd->db;
    ptr->db_length= thd->db_length;
  }
  else
  {
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    /* The following can't be "" as we may do 'casedn_str()' on it */
    ptr->db= empty_c_string;
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    ptr->db_length= 0;
  }
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  if (thd->current_arena->is_stmt_prepare_or_first_sp_execute())
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    ptr->db= thd->strdup(ptr->db);
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  ptr->alias= alias_str;
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  if (lower_case_table_names && table->table.length)
    my_casedn_str(files_charset_info, table->table.str);
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  ptr->table_name=table->table.str;
  ptr->table_name_length=table->table.length;
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  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);
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  ptr->derived=	    table->sel;
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  if (!my_strcasecmp(system_charset_info, ptr->db,
                     information_schema_name.str))
  {
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    ST_SCHEMA_TABLE *schema_table= find_schema_table(thd, ptr->table_name);
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    if (!schema_table ||
        (schema_table->hidden && 
         lex->orig_sql_command == SQLCOM_END))  // not a 'show' command
6083
    {
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      my_error(ER_UNKNOWN_TABLE, MYF(0),
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               ptr->table_name, information_schema_name.str);
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      DBUG_RETURN(0);
    }
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    ptr->schema_table_name= ptr->table_name;
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    ptr->schema_table= schema_table;
  }
6091
  ptr->select_lex=  lex->current_select;
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  ptr->cacheable_table= 1;
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  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 */
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  if (lock_type != TL_IGNORE)
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  {
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    for (TABLE_LIST *tables=(TABLE_LIST*) table_list.first ;
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	 tables ;
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	 tables=tables->next_local)
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    {
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      if (!my_strcasecmp(table_alias_charset, alias_str, tables->alias) &&
	  !strcmp(ptr->db, tables->db))
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      {
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	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)
  {
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    /*
      table_list.next points to the last inserted TABLE_LIST->next_local'
      element
    */
    previous_table_ref= (TABLE_LIST*) (table_list.next -
                                       offsetof(TABLE_LIST, next_local));
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    DBUG_ASSERT(previous_table_ref);
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    /*
      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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  }
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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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  table_list.link_in_list((byte*) ptr, (byte**) &ptr->next_local);
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  ptr->next_name_resolution_table= NULL;
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  /* Link table in global list (all used tables) */
6144
  lex->add_to_query_tables(ptr);
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  DBUG_RETURN(ptr);
}

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/*
  Initialize a new table list for a nested join

  SYNOPSIS
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    init_nested_join()
6154
    thd         current thread
6155

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  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");
6175

6176 6177
  if (!(ptr= (TABLE_LIST*) thd->calloc(ALIGN_SIZE(sizeof(TABLE_LIST))+
                                       sizeof(NESTED_JOIN))))
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    DBUG_RETURN(1);
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  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
6202
    moves it one level up, eliminating the nest.
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  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;
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  NESTED_JOIN *nested_join;
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  DBUG_ENTER("end_nested_join");
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  DBUG_ASSERT(embedding);
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  ptr= embedding;
  join_list= ptr->join_list;
  embedding= ptr->embedding;
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  nested_join= ptr->nested_join;
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  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;
  }
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  else if (nested_join->join_list.elements == 0)
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  {
    join_list->pop();
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    ptr= 0;                                     // return value
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  }
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  DBUG_RETURN(ptr);
}


/*
  Nest last join operation

  SYNOPSIS
6242
    nest_last_join()
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    thd         current thread

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

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

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*/

TABLE_LIST *st_select_lex::nest_last_join(THD *thd)
{
  TABLE_LIST *ptr;
  NESTED_JOIN *nested_join;
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  List<TABLE_LIST> *embedded_list;
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  DBUG_ENTER("nest_last_join");
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  if (!(ptr= (TABLE_LIST*) thd->calloc(ALIGN_SIZE(sizeof(TABLE_LIST))+
                                       sizeof(NESTED_JOIN))))
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    DBUG_RETURN(0);
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  nested_join= ptr->nested_join=
    ((NESTED_JOIN*) ((byte*) ptr + ALIGN_SIZE(sizeof(TABLE_LIST))));

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  ptr->embedding= embedding;
  ptr->join_list= join_list;
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  embedded_list= &nested_join->join_list;
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  embedded_list->empty();
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  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.
      */
      if (table->join_using_fields)
      {
        ptr->join_using_fields= table->join_using_fields;
        table->join_using_fields= NULL;
      }
    }
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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
*/

6357
TABLE_LIST *st_select_lex::convert_right_join()
6358 6359
{
  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 new name resolution context for a JOIN ... ON clause.

  SYNOPSIS
    make_join_on_context()
    thd       pointer to current thread
    left_op   lefto operand of the JOIN
    right_op  rigth operand of the JOIN

  DESCRIPTION
    Create a new name resolution context for a JOIN ... ON clause,
    and set the first and last leaves of the list of table references
    to be used for name resolution.

  RETURN
    A new context if all is OK
    NULL - if a memory allocation error occured
*/

Name_resolution_context *
make_join_on_context(THD *thd, TABLE_LIST *left_op, TABLE_LIST *right_op)
{
  Name_resolution_context *on_context;
6424
  if (!(on_context= new (thd->mem_root) Name_resolution_context))
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    return NULL;
  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();
  return on_context;
}


/*
  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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{
6453
  if (expr)
6454
  {
6455
    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);
6465 6466
    }
    b->on_expr->top_level_item();
6467
  }
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}


6471
/*
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  Mark that there is a NATURAL JOIN or JOIN ... USING between two
  tables.
6474 6475 6476

  SYNOPSIS
    add_join_natural()
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    a			Left join argument
    b			Right join argument
    using_fields        Field names from USING clause
  
6481
  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)
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{
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  b->natural_join= a;
  b->join_using_fields= using_fields;
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}

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6515
/*
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  Reload/resets privileges and the different caches.

  SYNOPSIS
    reload_acl_and_cache()
6520
    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 */
6540
  bool tmp_write_to_binlog= 1;
6541

6542
  if (thd && thd->in_sub_stmt)
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  {
    my_error(ER_STMT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0), "FLUSH");
    return 1;
  }

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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  if (options & REFRESH_GRANT)
  {
6551
    acl_reload(thd);
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    grant_reload(thd);
6553
    reset_mqh((LEX_USER *)NULL, TRUE);
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  }
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#endif
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  if (options & REFRESH_LOG)
  {
6558
    /*
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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).
6561
    */
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6563
    /*
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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)
6568 6569
    */
    tmp_write_to_binlog= 0;
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    mysql_log.new_file(1);
    mysql_slow_log.new_file(1);
6572
    mysql_bin_log.rotate_and_purge(RP_FORCE_ROTATE);
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#ifdef HAVE_REPLICATION
6574
    pthread_mutex_lock(&LOCK_active_mi);
6575
    rotate_relay_log(active_mi);
6576
    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
6587
    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*/
6594 6595 6596 6597 6598
  /*
    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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  {
6600
    if ((options & REFRESH_READ_LOCK) && thd)
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    {
6602 6603 6604 6605 6606 6607 6608 6609 6610 6611 6612
      /*
        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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        }
6620
      }
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      /*
	Writing to the binlog could cause deadlocks, as we don't log
	UNLOCK TABLES
      */
6625
      tmp_write_to_binlog= 0;
6626
      if (lock_global_read_lock(thd))
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	return 1;                               // Killed
6628 6629
      result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1,
                                 tables);
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      if (make_global_read_lock_block_commit(thd)) // Killed
6631 6632 6633 6634 6635
      {
        /* Don't leave things in a half-locked state */
        unlock_global_read_lock(thd);
        return 1;
      }
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    }
6637 6638
    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();
  if (options & REFRESH_THREADS)
    flush_thread_cache();
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6647
#ifdef HAVE_REPLICATION
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6648
  if (options & REFRESH_MASTER)
6649 6650
  {
    tmp_write_to_binlog= 0;
6651
    if (reset_master(thd))
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6652
    {
6653
      result=1;
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      thd->fatal_error();                       // Ensure client get error
    }
6656
  }
6657
#endif
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#ifdef OPENSSL
6659 6660 6661 6662 6663 6664
   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
6666 6667
 if (options & REFRESH_SLAVE)
 {
6668
   tmp_write_to_binlog= 0;
6669
   pthread_mutex_lock(&LOCK_active_mi);
6670
   if (reset_slave(thd, active_mi))
6671
     result=1;
6672
   pthread_mutex_unlock(&LOCK_active_mi);
6673
 }
6674
#endif
6675
 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;
6678
 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;
6697 6698
  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)
    {
6703 6704
      pthread_mutex_lock(&tmp->LOCK_delete);	// Lock from delete
      break;
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    }
  }
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
6708 6709 6710 6711 6712
  if (tmp)
  {
    if ((thd->master_access & SUPER_ACL) ||
	!strcmp(thd->user,tmp->user))
    {
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6713
      tmp->awake(only_kill_query ? THD::KILL_QUERY : THD::KILL_CONNECTION);
6714 6715 6716 6717 6718 6719 6720
      error=0;
    }
    else
      error=ER_KILL_DENIED_ERROR;
    pthread_mutex_unlock(&tmp->LOCK_delete);
  }

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  if (!error)
6722
    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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6727

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/* Clear most status variables */

static void refresh_status(void)
{
  pthread_mutex_lock(&LOCK_status);
  for (struct show_var_st *ptr=status_vars; ptr->name; ptr++)
  {
    if (ptr->type == SHOW_LONG)
6736
      *(ulong*) ptr->value= 0;
6737 6738 6739 6740 6741 6742 6743
    else if (ptr->type == SHOW_LONG_STATUS)
    {
      THD *thd= current_thd;
      /* We must update the global status before cleaning up the thread */
      add_to_status(&global_status_var, &thd->status_var);
      bzero((char*) &thd->status_var, sizeof(thd->status_var));
    }
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  }
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  /* Reset the counters of all key caches (default and named). */
  process_key_caches(reset_key_cache_counters);
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  pthread_mutex_unlock(&LOCK_status);
}
6749 6750 6751 6752


	/* 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)
6755
{
6756
  char buff[FN_REFLEN],*ptr, *end;
6757 6758 6759 6760 6761 6762 6763
  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))
  {
6764
    my_error(ER_WRONG_TABLE_NAME, MYF(0), *filename_ptr);
6765 6766 6767 6768
    return 1;
  }
  /* Fix is using unix filename format on dos */
  strmov(buff,*filename_ptr);
6769
  end=convert_dirname(buff, *filename_ptr, NullS);
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  if (!(ptr=thd->alloc((uint) (end-buff)+(uint) strlen(table_name)+1)))
6771 6772
    return 1;					// End of memory
  *filename_ptr=ptr;
6773
  strxmov(ptr,buff,table_name,NullS);
6774 6775
  return 0;
}
6776

6777

6778 6779 6780 6781 6782 6783 6784 6785 6786 6787 6788 6789 6790 6791
/*
  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;
6792 6793
  LEX *lex= thd->lex;
  if (lex->current_select != &lex->select_lex)
6794 6795
  {
    char command[80];
6796 6797
    strmake(command, lex->yylval->symbol.str,
	    min(lex->yylval->symbol.length, sizeof(command)-1));
6798
    my_error(ER_CANT_USE_OPTION_HERE, MYF(0), command);
6799 6800 6801 6802
    return 1;
  }
  return 0;
}
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6803

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/*
  Setup locking for multi-table updates. Used by the replication slave.
  Replication slave SQL thread examines (all_tables_not_ok()) the
  locking state of referenced tables to determine if the query has to
  be executed or ignored. Since in multi-table update, the 
  'default' lock is read-only, this lock is corrected early enough by
  calling this function, before the slave decides to execute/ignore.

  SYNOPSIS
    check_multi_update_lock()
    thd		Current thread

  RETURN VALUES
    0	ok
    1	error
*/
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static bool check_multi_update_lock(THD *thd)
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{
  bool res= 1;
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  LEX *lex= thd->lex;
  TABLE_LIST *table, *tables= lex->query_tables;
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  DBUG_ENTER("check_multi_update_lock");
  
  if (check_db_used(thd, tables))
    goto error;

  /*
    Ensure that we have UPDATE or SELECT privilege for each table
    The exact privilege is checked in mysql_multi_update()
  */
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  for (table= tables ; table ; table= table->next_local)
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  {
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    TABLE_LIST *save= table->next_local;
    table->next_local= 0;
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    if ((check_access(thd, UPDATE_ACL, table->db, &table->grant.privilege,0,1) ||
        (grant_option && check_grant(thd, UPDATE_ACL, table,0,1,1))) &&
	check_one_table_access(thd, SELECT_ACL, table))
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	goto error;
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    table->next_local= save;
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  }
    
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  if (mysql_multi_update_prepare(thd))
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    goto error;
  
  res= 0;
  
error:
  DBUG_RETURN(res);
}
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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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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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6909
  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=
6916
    new Item_allany_subselect(left_expr, (*cmp)(all), select_lex, all);
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  if (all)
6918
    return it->upper_item= new Item_func_not_all(it);	/* ALL */
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6920
  return it->upper_item= new Item_func_nop_all(it);      /* ANY/SOME */
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}
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/*
  CREATE INDEX and DROP INDEX are implemented by calling ALTER TABLE with
  the 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.
*/

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bool mysql_create_index(THD *thd, TABLE_LIST *table_list, List<Key> &keys)
6937 6938
{
  List<create_field> fields;
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  ALTER_INFO alter_info;
  alter_info.flags= ALTER_ADD_INDEX;
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  HA_CREATE_INFO create_info;
  DBUG_ENTER("mysql_create_index");
  bzero((char*) &create_info,sizeof(create_info));
  create_info.db_type=DB_TYPE_DEFAULT;
  create_info.default_table_charset= thd->variables.collation_database;
6946
  DBUG_RETURN(mysql_alter_table(thd,table_list->db,table_list->table_name,
6947
				&create_info, table_list,
6948
				fields, keys, 0, (ORDER*)0,
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				DUP_ERROR, 0, &alter_info, 1));
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}


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bool mysql_drop_index(THD *thd, TABLE_LIST *table_list, ALTER_INFO *alter_info)
6954 6955 6956 6957 6958 6959 6960 6961
{
  List<create_field> fields;
  List<Key> keys;
  HA_CREATE_INFO create_info;
  DBUG_ENTER("mysql_drop_index");
  bzero((char*) &create_info,sizeof(create_info));
  create_info.db_type=DB_TYPE_DEFAULT;
  create_info.default_table_charset= thd->variables.collation_database;
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  alter_info->clear();
  alter_info->flags= ALTER_DROP_INDEX;
6964
  DBUG_RETURN(mysql_alter_table(thd,table_list->db,table_list->table_name,
6965
				&create_info, table_list,
6966
				fields, keys, 0, (ORDER*)0,
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				DUP_ERROR, 0, alter_info, 1));
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}
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/*
  Multi update query pre-check

  SYNOPSIS
    multi_update_precheck()
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    thd		Thread handler
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VIEW  
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    tables	Global/local table list (have to be the same)
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  RETURN VALUE
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    FALSE OK
    TRUE  Error
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*/
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bool multi_update_precheck(THD *thd, TABLE_LIST *tables)
6985 6986 6987 6988 6989
{
  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");
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  if (select_lex->item_list.elements != lex->value_list.elements)
  {
6994
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
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    DBUG_RETURN(TRUE);
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  }
  /*
    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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  for (table= tables; table; table= table->next_local)
7002
  {
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    if (table->derived)
      table->grant.privilege= SELECT_ACL;
    else if ((check_access(thd, UPDATE_ACL, table->db,
                           &table->grant.privilege, 0, 1) ||
              grant_option &&
              check_grant(thd, UPDATE_ACL, table, 0, 1, 1)) &&
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             (check_access(thd, SELECT_ACL, table->db,
                           &table->grant.privilege, 0, 0) ||
              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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    table->table_in_first_from_clause= 1;
7015
  }
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  /*
    Is there tables of subqueries?
  */
7019
  if (&lex->select_lex != lex->all_selects_list || lex->time_zone_tables_used)
7020
  {
7021
    DBUG_PRINT("info",("Checking sub query list"));
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    for (table= tables; table; table= table->next_global)
7023
    {
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      if (!my_tz_check_n_skip_implicit_tables(&table,
                                              lex->time_zone_tables_used) &&
          !table->table_in_first_from_clause)
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      {
	if (check_access(thd, SELECT_ACL, table->db,
			 &table->grant.privilege, 0, 0) ||
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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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      }
    }
  }

  if (select_lex->order_list.elements)
    msg= "ORDER BY";
7038
  else if (select_lex->select_limit)
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    msg= "LIMIT";
  if (msg)
  {
    my_error(ER_WRONG_USAGE, MYF(0), "UPDATE", msg);
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    DBUG_RETURN(TRUE);
7044
  }
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  DBUG_RETURN(FALSE);
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}

/*
  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
7055

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  RETURN VALUE
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    FALSE OK
    TRUE  error
7059
*/
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7061
bool multi_delete_precheck(THD *thd, TABLE_LIST *tables)
7062 7063 7064 7065
{
  SELECT_LEX *select_lex= &thd->lex->select_lex;
  TABLE_LIST *aux_tables=
    (TABLE_LIST *)thd->lex->auxilliary_table_list.first;
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  DBUG_ENTER("multi_delete_precheck");
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  /* 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) ||
      check_table_access(thd,SELECT_ACL, tables,0) ||
      check_table_access(thd,DELETE_ACL, aux_tables,0))
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    DBUG_RETURN(TRUE);
7074 7075
  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);
7079
  }
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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;

  for (target_tbl= (TABLE_LIST *)lex->auxilliary_table_list.first;
       target_tbl; target_tbl= target_tbl->next_local)
7107
  {
7108
    lex->table_count++;
7109 7110
    /* All tables in aux_tables must be found in FROM PART */
    TABLE_LIST *walk;
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7111
    for (walk= tables; walk; walk= walk->next_local)
7112
    {
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      if (!my_strcasecmp(table_alias_charset,
			 target_tbl->alias, walk->alias) &&
	  !strcmp(walk->db, target_tbl->db))
7116 7117 7118 7119
	break;
    }
    if (!walk)
    {
7120
      my_error(ER_UNKNOWN_TABLE, MYF(0),
7121
               target_tbl->table_name, "MULTI DELETE");
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      DBUG_RETURN(TRUE);
7123
    }
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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
7126
  }
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  DBUG_RETURN(FALSE);
7128 7129 7130
}


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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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7138 7139

  RETURN VALUE
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    FALSE OK
    TRUE  Error
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*/
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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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  RETURN VALUE
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    FALSE  OK
    TRUE   error
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*/
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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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  /* Set privilege for the WHERE clause */
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  tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
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  DBUG_RETURN(FALSE);
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}


/*
  simple INSERT query pre-check

  SYNOPSIS
    insert_precheck()
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    thd		Thread handler
    tables	Global table list
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7188 7189

  RETURN VALUE
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    FALSE  OK
    TRUE   error
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7192
*/
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7193

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7194
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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7209

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  if (lex->update_list.elements != lex->value_list.elements)
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7211
  {
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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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7214
  }
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  DBUG_RETURN(FALSE);
7216
}
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/*
  CREATE TABLE query pre-check

  SYNOPSIS
    create_table_precheck()
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    thd			Thread handler
    tables		Global table list
    create_table	Table which will be created
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7227 7228

  RETURN VALUE
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    FALSE   OK
    TRUE   Error
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7231
*/
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bool create_table_precheck(THD *thd, TABLE_LIST *tables,
                           TABLE_LIST *create_table)
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{
  LEX *lex= thd->lex;
7237 7238
  SELECT_LEX *select_lex= &lex->select_lex;
  ulong want_priv;
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7239
  bool error= TRUE;                                 // Error message is given
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  DBUG_ENTER("create_table_precheck");
7241 7242 7243

  want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
              CREATE_TMP_ACL : CREATE_ACL);
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  lex->create_info.alias= create_table->alias;
  if (check_access(thd, want_priv, create_table->db,
		   &create_table->grant.privilege, 0, 0) ||
      check_merge_table_access(thd, create_table->db,
			       (TABLE_LIST *)
			       lex->create_info.merge_list.first))
7250 7251 7252 7253 7254 7255 7256 7257 7258
    goto err;
  if (grant_option && want_priv != CREATE_TMP_ACL &&
      check_grant(thd, want_priv, create_table, 0, UINT_MAX, 0))
    goto err;

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

7259 7260
#ifdef NOT_NECESSARY_TO_CHECK_CREATE_TABLE_EXIST_WHEN_PREPARING_STATEMENT
    /* This code throws an ill error for CREATE TABLE t1 SELECT * FROM t1 */
7261
    /*
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7262 7263 7264
      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).
7265
    */
7266
    if (thd->current_arena->is_stmt_prepare_or_first_sp_execute())
7267
    {
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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,
7273
                                    create_table->table_name))
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7274
      {
7275
	error= FALSE;
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7276 7277 7278
        goto err;
      }
    }
7279
#endif
7280 7281 7282
    if (tables && check_table_access(thd, SELECT_ACL, tables,0))
      goto err;
  }
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7283
  error= FALSE;
7284 7285 7286

err:
  DBUG_RETURN(error);
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7287
}
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/*
  negate given expression

  SYNOPSIS
    negate_expression()
7295
    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);
}