sql_parse.cc 230 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 */

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#define MYSQL_LEX 1
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#include "mysql_priv.h"
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#include "sql_repl.h"
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#include "rpl_filter.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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#include "sp_head.h"
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#include "sp.h"
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#include "sp_cache.h"
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#include "events.h"
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#include "event_data_objects.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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static void decrease_user_connections(USER_CONN *uc);
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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static bool check_multi_update_lock(THD *thd);
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static bool execute_sqlcom_select(THD *thd, TABLE_LIST *all_tables);
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const char *any_db="*any*";	// Special symbol for check_access
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const LEX_STRING command_name[]={
  C_STRING_WITH_LEN("Sleep"),
  C_STRING_WITH_LEN("Quit"),
  C_STRING_WITH_LEN("Init DB"),
  C_STRING_WITH_LEN("Query"),
  C_STRING_WITH_LEN("Field List"),
  C_STRING_WITH_LEN("Create DB"),
  C_STRING_WITH_LEN("Drop DB"),
  C_STRING_WITH_LEN("Refresh"),
  C_STRING_WITH_LEN("Shutdown"),
  C_STRING_WITH_LEN("Statistics"),
  C_STRING_WITH_LEN("Processlist"),
  C_STRING_WITH_LEN("Connect"),
  C_STRING_WITH_LEN("Kill"),
  C_STRING_WITH_LEN("Debug"),
  C_STRING_WITH_LEN("Ping"),
  C_STRING_WITH_LEN("Time"),
  C_STRING_WITH_LEN("Delayed insert"),
  C_STRING_WITH_LEN("Change user"),
  C_STRING_WITH_LEN("Binlog Dump"),
  C_STRING_WITH_LEN("Table Dump"),
  C_STRING_WITH_LEN("Connect Out"),
  C_STRING_WITH_LEN("Register Slave"),
  C_STRING_WITH_LEN("Prepare"),
  C_STRING_WITH_LEN("Execute"),
  C_STRING_WITH_LEN("Long Data"),
  C_STRING_WITH_LEN("Close stmt"),
  C_STRING_WITH_LEN("Reset stmt"),
  C_STRING_WITH_LEN("Set option"),
  C_STRING_WITH_LEN("Fetch"),
  C_STRING_WITH_LEN("Daemon"),
  C_STRING_WITH_LEN("Error")  // Last command number
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};

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

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

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bool begin_trans(THD *thd)
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{
  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|= OPTION_BEGIN;
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    thd->server_status|= SERVER_STATUS_IN_TRANS;
    if (lex->start_transaction_opt & MYSQL_START_TRANS_OPT_WITH_CONS_SNAPSHOT)
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      error= ha_start_consistent_snapshot(thd);
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  }
  return error;
}
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#ifdef HAVE_REPLICATION
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/*
  Returns true if all tables should be ignored
*/
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inline bool all_tables_not_ok(THD *thd, TABLE_LIST *tables)
{
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  return rpl_filter->is_on() && tables && !thd->spcont &&
         !rpl_filter->tables_ok(thd->db, tables);
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}
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#endif
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static bool some_non_temp_table_to_be_updated(THD *thd, TABLE_LIST *tables)
{
  for (TABLE_LIST *table= tables; table; table= table->next_global)
  {
    DBUG_ASSERT(table->db && table->table_name);
    if (table->updating &&
        !find_temporary_table(thd, table->db, table->table_name))
      return 1;
  }
  return 0;
}

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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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static HASH hash_user_connections;

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

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

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

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

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

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

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int check_user(THD *thd, enum enum_server_command command, 
	       const char *passwd, uint passwd_len, const char *db,
	       bool check_count)
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{
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  DBUG_ENTER("check_user");
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#ifdef NO_EMBEDDED_ACCESS_CHECKS
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  thd->main_security_ctx.master_access= GLOBAL_ACLS;       // Full rights
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  /* Change database if necessary */
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  if (db && db[0])
  {
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    /*
      thd->db is saved in caller and needs to be freed by caller if this
      function returns 0
    */
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    thd->reset_db(NULL, 0);
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    if (mysql_change_db(thd, db, FALSE))
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    {
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      /* Send the error to the client */
      net_send_error(thd);
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      DBUG_RETURN(-1);
    }
  }
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  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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    general_log_print(thd, COM_CONNECT, ER(ER_NOT_SUPPORTED_AUTH_MODE));
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    DBUG_RETURN(-1);
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  }
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  if (passwd_len != 0 &&
      passwd_len != SCRAMBLE_LENGTH &&
      passwd_len != SCRAMBLE_LENGTH_323)
    DBUG_RETURN(ER_HANDSHAKE_ERROR);
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  /*
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    Clear thd->db as it points to something, that will be freed when 
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    connection is closed. We don't want to accidentally free a wrong pointer
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    if connect failed. Also in case of 'CHANGE USER' failure, current
    database will be switched to 'no database selected'.
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  */
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  thd->reset_db(NULL, 0);

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  USER_RESOURCES ur;
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  int res= acl_getroot(thd, &ur, passwd, passwd_len);
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#ifndef EMBEDDED_LIBRARY
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  if (res == -1)
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  {
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    /*
      This happens when client (new) sends password scrambled with
      scramble(), but database holds old value (scrambled with
      scramble_323()). Here we please client to send scrambled_password
      in old format.
    */
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    NET *net= &thd->net;
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    if (opt_secure_auth_local)
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    {
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      net_printf_error(thd, ER_SERVER_IS_IN_SECURE_AUTH_MODE,
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                       thd->main_security_ctx.user,
                       thd->main_security_ctx.host_or_ip);
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      general_log_print(thd, COM_CONNECT, ER(ER_SERVER_IS_IN_SECURE_AUTH_MODE),
                        thd->main_security_ctx.user,
                        thd->main_security_ctx.host_or_ip);
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      DBUG_RETURN(-1);
    }
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    /* We have to read very specific packet size */
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    if (send_old_password_request(thd) ||
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        my_net_read(net) != SCRAMBLE_LENGTH_323 + 1)
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    {
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      inc_host_errors(&thd->remote.sin_addr);
      DBUG_RETURN(ER_HANDSHAKE_ERROR);
    }
    /* Final attempt to check the user based on reply */
    /* So as passwd is short, errcode is always >= 0 */
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    res= acl_getroot(thd, &ur, (char *) net->read_pos, SCRAMBLE_LENGTH_323);
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  }
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#endif /*EMBEDDED_LIBRARY*/
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  /* here res is always >= 0 */
  if (res == 0)
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  {
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    if (!(thd->main_security_ctx.master_access &
          NO_ACCESS)) // authentication is OK
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    {
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      DBUG_PRINT("info",
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                 ("Capabilities: %lx  packet_length: %ld  Host: '%s'  "
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                  "Login user: '%s' Priv_user: '%s'  Using password: %s "
                  "Access: %u  db: '%s'",
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                  thd->client_capabilities,
                  thd->max_client_packet_length,
                  thd->main_security_ctx.host_or_ip,
                  thd->main_security_ctx.user,
                  thd->main_security_ctx.priv_user,
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                  passwd_len ? "yes": "no",
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                  thd->main_security_ctx.master_access,
                  (thd->db ? thd->db : "*none*")));
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      if (check_count)
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      {
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        VOID(pthread_mutex_lock(&LOCK_thread_count));
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        bool count_ok= thread_count <= max_connections + delayed_insert_threads
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                       || (thd->main_security_ctx.master_access & SUPER_ACL);
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        VOID(pthread_mutex_unlock(&LOCK_thread_count));
        if (!count_ok)
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        {                                         // too many connections
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          net_send_error(thd, ER_CON_COUNT_ERROR);
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          DBUG_RETURN(-1);
        }
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      }
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      /* Why logging is performed before all checks've passed? */
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      general_log_print(thd, command,
                        (thd->main_security_ctx.priv_user ==
                         thd->main_security_ctx.user ?
                         (char*) "%s@%s on %s" :
                         (char*) "%s@%s as anonymous on %s"),
                        thd->main_security_ctx.user,
                        thd->main_security_ctx.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->main_security_ctx.db_access=0;
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      /* Don't allow user to connect if he has done too many queries */
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      if ((ur.questions || ur.updates || ur.conn_per_hour || ur.user_conn ||
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	   max_user_connections) &&
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	  get_or_create_user_conn(thd,
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            (opt_old_style_user_limits ? thd->main_security_ctx.user :
             thd->main_security_ctx.priv_user),
            (opt_old_style_user_limits ? thd->main_security_ctx.host_or_ip :
             thd->main_security_ctx.priv_host),
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            &ur))
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	DBUG_RETURN(-1);
      if (thd->user_connect &&
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	  (thd->user_connect->user_resources.conn_per_hour ||
	   thd->user_connect->user_resources.user_conn ||
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	   max_user_connections) &&
	  check_for_max_user_connections(thd, thd->user_connect))
	DBUG_RETURN(-1);
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      /* Change database if necessary */
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      if (db && db[0])
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      {
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        if (mysql_change_db(thd, db, FALSE))
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        {
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          /* Send error to the client */
          net_send_error(thd);
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          if (thd->user_connect)
            decrease_user_connections(thd->user_connect);
          DBUG_RETURN(-1);
        }
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      }
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      send_ok(thd);
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      thd->password= test(passwd_len);          // remember for error messages 
      /* Ready to handle queries */
      DBUG_RETURN(0);
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    }
  }
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  else if (res == 2) // client gave short hash, server has long hash
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  {
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    net_printf_error(thd, ER_NOT_SUPPORTED_AUTH_MODE);
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    general_log_print(thd, COM_CONNECT, ER(ER_NOT_SUPPORTED_AUTH_MODE));
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    DBUG_RETURN(-1);
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  }
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  net_printf_error(thd, ER_ACCESS_DENIED_ERROR,
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                   thd->main_security_ctx.user,
                   thd->main_security_ctx.host_or_ip,
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                   passwd_len ? ER(ER_YES) : ER(ER_NO));
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  general_log_print(thd, COM_CONNECT, ER(ER_ACCESS_DENIED_ERROR),
                    thd->main_security_ctx.user,
                    thd->main_security_ctx.host_or_ip,
                    passwd_len ? ER(ER_YES) : ER(ER_NO));
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  DBUG_RETURN(-1);
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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}

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

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

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

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


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

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

  RETURN
    0	ok
    1	error
*/

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#ifndef NO_EMBEDDED_ACCESS_CHECKS

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

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/*
  Decrease user connection count

  SYNOPSIS
    decrease_user_connections()
    uc			User connection object

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

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

598
static void decrease_user_connections(USER_CONN *uc)
599
{
600
  DBUG_ENTER("decrease_user_connections");
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  (void) pthread_mutex_lock(&LOCK_user_conn);
  DBUG_ASSERT(uc->connections);
  if (!--uc->connections && !mqh_used)
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  {
    /* Last connection for user; Delete it */
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    (void) hash_delete(&hash_user_connections,(byte*) uc);
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  }
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  (void) pthread_mutex_unlock(&LOCK_user_conn);
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  DBUG_VOID_RETURN;
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}

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#endif /* NO_EMBEDDED_ACCESS_CHECKS */

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

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/*
  Mark all commands that somehow changes a table
  This is used to check number of updates / hour
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  sql_command is actually set to SQLCOM_END sometimes
  so we need the +1 to include it in the array.
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  See COMMAND_FLAG_xxx for different type of commands
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     2  - query that returns meaningful ROW_COUNT() -
          a number of modified rows
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*/

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

  sql_command_flags[SQLCOM_CREATE_TABLE]=   CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_CREATE_INDEX]=   CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_ALTER_TABLE]=    CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_TRUNCATE]=       CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_DROP_TABLE]=     CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_LOAD]=           CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_CREATE_DB]=      CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_DROP_DB]=        CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_RENAME_TABLE]=   CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_BACKUP_TABLE]=   CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_RESTORE_TABLE]=  CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_DROP_INDEX]=     CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_CREATE_VIEW]=    CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_DROP_VIEW]=      CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_CREATE_EVENT]=   CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_ALTER_EVENT]=    CF_CHANGES_DATA;
  sql_command_flags[SQLCOM_DROP_EVENT]=     CF_CHANGES_DATA;  

  sql_command_flags[SQLCOM_UPDATE]=	    CF_CHANGES_DATA | CF_HAS_ROW_COUNT;
  sql_command_flags[SQLCOM_UPDATE_MULTI]=   CF_CHANGES_DATA | CF_HAS_ROW_COUNT;
  sql_command_flags[SQLCOM_INSERT]=	    CF_CHANGES_DATA | CF_HAS_ROW_COUNT;
  sql_command_flags[SQLCOM_INSERT_SELECT]=  CF_CHANGES_DATA | CF_HAS_ROW_COUNT;
  sql_command_flags[SQLCOM_DELETE]=         CF_CHANGES_DATA | CF_HAS_ROW_COUNT;
  sql_command_flags[SQLCOM_DELETE_MULTI]=   CF_CHANGES_DATA | CF_HAS_ROW_COUNT;
  sql_command_flags[SQLCOM_REPLACE]=        CF_CHANGES_DATA | CF_HAS_ROW_COUNT;
  sql_command_flags[SQLCOM_REPLACE_SELECT]= CF_CHANGES_DATA | CF_HAS_ROW_COUNT;

  sql_command_flags[SQLCOM_SHOW_STATUS_PROC]= CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_STATUS_FUNC]= CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_STATUS]=      CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_DATABASES]=   CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_TRIGGERS]=    CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_EVENTS]=      CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_OPEN_TABLES]= CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_PLUGINS]=     CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_FIELDS]=      CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_KEYS]=        CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_VARIABLES]=   CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_CHARSETS]=    CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_COLLATIONS]=  CF_STATUS_COMMAND;
  sql_command_flags[SQLCOM_SHOW_STATUS_PROC]= CF_STATUS_COMMAND;

  sql_command_flags[SQLCOM_SHOW_TABLES]=       (CF_STATUS_COMMAND |
                                                CF_SHOW_TABLE_COMMAND);
  sql_command_flags[SQLCOM_SHOW_TABLE_STATUS]= (CF_STATUS_COMMAND |
                                                CF_SHOW_TABLE_COMMAND);

  /*
    The following is used to preserver CF_ROW_COUNT during the
    a CALL or EXECUTE statement, so the value generated by the
    last called (or executed) statement is preserved.
    See mysql_execute_command() for how CF_ROW_COUNT is used.
  */
  sql_command_flags[SQLCOM_CALL]= 		CF_HAS_ROW_COUNT;
  sql_command_flags[SQLCOM_EXECUTE]= 		CF_HAS_ROW_COUNT;
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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 (sql_command_flags[command] & CF_CHANGES_DATA) != 0;
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}
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/*
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  Reset per-hour user resource limits when it has been more than
  an hour since they were last checked
709

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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;
  }
764
  if (check_command < (uint) SQLCOM_END)
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  {
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    /* Check that we have not done too many updates / hour */
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    if (uc->user_resources.updates &&
        (sql_command_flags[check_command] & CF_CHANGES_DATA) &&
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	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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}

785

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static void reset_mqh(LEX_USER *lu, bool get_them= 0)
787
{
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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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  {
792
    USER_CONN *uc;
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    uint temp_len=lu->user.length+lu->host.length+2;
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    char temp_user[USER_HOST_BUFF_SIZE];
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    memcpy(temp_user,lu->user.str,lu->user.length);
    memcpy(temp_user+lu->user.length+1,lu->host.str,lu->host.length);
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    temp_user[lu->user.length]='\0'; temp_user[temp_len-1]=0;
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    if ((uc = (struct  user_conn *) hash_search(&hash_user_connections,
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						(byte*) temp_user, temp_len)))
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    {
      uc->questions=0;
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      get_mqh(temp_user,&temp_user[lu->user.length+1],uc);
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      uc->updates=0;
      uc->conn_per_hour=0;
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    }
  }
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  else
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  {
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    /* for FLUSH PRIVILEGES and FLUSH USER_RESOURCES */
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    for (uint idx=0;idx < hash_user_connections.records; idx++)
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    {
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      USER_CONN *uc=(struct user_conn *) hash_element(&hash_user_connections,
						      idx);
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      if (get_them)
	get_mqh(uc->user,uc->host,uc);
      uc->questions=0;
      uc->updates=0;
      uc->conn_per_hour=0;
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    }
  }
822
  (void) pthread_mutex_unlock(&LOCK_user_conn);
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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}
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void thd_init_client_charset(THD *thd, uint cs_number)
{
  /*
   Use server character set and collation if
   - opt_character_set_client_handshake is not set
   - client has not specified a character set
   - client character set is the same as the servers
   - client character set doesn't exists in server
  */
  if (!opt_character_set_client_handshake ||
      !(thd->variables.character_set_client= get_charset(cs_number, MYF(0))) ||
      !my_strcasecmp(&my_charset_latin1,
                     global_system_variables.character_set_client->name,
                     thd->variables.character_set_client->name))
  {
    thd->variables.character_set_client=
      global_system_variables.character_set_client;
    thd->variables.collation_connection=
      global_system_variables.collation_connection;
    thd->variables.character_set_results=
      global_system_variables.character_set_results;
  }
  else
  {
    thd->variables.character_set_results=
      thd->variables.collation_connection= 
      thd->variables.character_set_client;
  }
}


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/*
858
    Perform handshake, authorize client and update thd ACL variables.
859
  SYNOPSIS
860
    check_connection()
861
    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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{
872
  uint connect_errors= 0;
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  NET *net= &thd->net;
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  ulong pkt_len= 0;
  char *end;
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  DBUG_PRINT("info",
             ("New connection received on %s", vio_description(net->vio)));
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#ifdef SIGNAL_WITH_VIO_CLOSE
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  thd->set_active_vio(net->vio);
881
#endif
882

883
  if (!thd->main_security_ctx.host)         // If TCP/IP connection
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  {
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    char ip[30];
886

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    if (vio_peer_addr(net->vio, ip, &thd->peer_port))
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      return (ER_BAD_HOST_ERROR);
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    if (!(thd->main_security_ctx.ip= my_strdup(ip,MYF(0))))
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      return (ER_OUT_OF_RESOURCES);
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    thd->main_security_ctx.host_or_ip= thd->main_security_ctx.ip;
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    vio_in_addr(net->vio,&thd->remote.sin_addr);
893
    if (!(specialflag & SPECIAL_NO_RESOLVE))
894
    {
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      vio_in_addr(net->vio,&thd->remote.sin_addr);
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      thd->main_security_ctx.host=
        ip_to_hostname(&thd->remote.sin_addr, &connect_errors);
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      /* Cut very long hostnames to avoid possible overflows */
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      if (thd->main_security_ctx.host)
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      {
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        if (thd->main_security_ctx.host != my_localhost)
          thd->main_security_ctx.host[min(strlen(thd->main_security_ctx.host),
                                          HOSTNAME_LENGTH)]= 0;
        thd->main_security_ctx.host_or_ip= thd->main_security_ctx.host;
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      }
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      if (connect_errors > max_connect_errors)
        return(ER_HOST_IS_BLOCKED);
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    }
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    DBUG_PRINT("info",("Host: %s  ip: %s",
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		       (thd->main_security_ctx.host ?
                        thd->main_security_ctx.host : "unknown host"),
		       (thd->main_security_ctx.ip ?
                        thd->main_security_ctx.ip : "unknown ip")));
    if (acl_check_host(thd->main_security_ctx.host, thd->main_security_ctx.ip))
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      return(ER_HOST_NOT_PRIVILEGED);
  }
917
  else /* Hostname given means that the connection was on a socket */
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  {
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    DBUG_PRINT("info",("Host: %s", thd->main_security_ctx.host));
    thd->main_security_ctx.host_or_ip= thd->main_security_ctx.host;
    thd->main_security_ctx.ip= 0;
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    /* Reset sin_addr */
    bzero((char*) &thd->remote, sizeof(thd->remote));
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  }
  vio_keepalive(net->vio, TRUE);
  {
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    /* buff[] needs to big enough to hold the server_version variable */
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    char buff[SERVER_VERSION_LENGTH + SCRAMBLE_LENGTH + 64];
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    ulong client_flags = (CLIENT_LONG_FLAG | CLIENT_CONNECT_WITH_DB |
			  CLIENT_PROTOCOL_41 | CLIENT_SECURE_CONNECTION);
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    if (opt_using_transactions)
      client_flags|=CLIENT_TRANSACTIONS;
#ifdef HAVE_COMPRESS
    client_flags |= CLIENT_COMPRESS;
#endif /* HAVE_COMPRESS */
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#ifdef HAVE_OPENSSL
    if (ssl_acceptor_fd)
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      client_flags |= CLIENT_SSL;       /* Wow, SSL is available! */
940
#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);
983
  if (thd->packet.alloc(thd->variables.net_buffer_length))
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984 985 986
    return(ER_OUT_OF_RESOURCES);

  thd->client_capabilities=uint2korr(net->read_pos);
987 988 989 990
  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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991
    DBUG_PRINT("info", ("client_character_set: %d", (uint) net->read_pos[8]));
992
    thd_init_client_charset(thd, (uint) net->read_pos[8]);
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993
    thd->update_charset();
994
    end= (char*) net->read_pos+32;
995 996 997 998 999 1000 1001
  }
  else
  {
    thd->max_client_packet_length= uint3korr(net->read_pos+2);
    end= (char*) net->read_pos+5;
  }

1002
  if (thd->client_capabilities & CLIENT_IGNORE_SPACE)
1003
    thd->variables.sql_mode|= MODE_IGNORE_SPACE;
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1004
#ifdef HAVE_OPENSSL
1005
  DBUG_PRINT("info", ("client capabilities: %d", thd->client_capabilities));
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1006 1007 1008
  if (thd->client_capabilities & CLIENT_SSL)
  {
    /* Do the SSL layering. */
1009 1010 1011 1012 1013
    if (!ssl_acceptor_fd)
    {
      inc_host_errors(&thd->remote.sin_addr);
      return(ER_HANDSHAKE_ERROR);
    }
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1014
    DBUG_PRINT("info", ("IO layer change in progress..."));
1015 1016
    if (sslaccept(ssl_acceptor_fd, net->vio, thd->variables.net_wait_timeout))
    {
1017
      DBUG_PRINT("error", ("Failed to accept new SSL connection"));
1018
      inc_host_errors(&thd->remote.sin_addr);
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1019
      return(ER_HANDSHAKE_ERROR);
1020
    }
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1021
    DBUG_PRINT("info", ("Reading user information over SSL layer"));
1022
    if ((pkt_len= my_net_read(net)) == packet_error ||
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1023 1024
	pkt_len < NORMAL_HANDSHAKE_SIZE)
    {
1025 1026
      DBUG_PRINT("error", ("Failed to read user information (pkt_len= %lu)",
			   pkt_len));
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1027 1028 1029 1030
      inc_host_errors(&thd->remote.sin_addr);
      return(ER_HANDSHAKE_ERROR);
    }
  }
1031 1032 1033
#endif

  if (end >= (char*) net->read_pos+ pkt_len +2)
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1034
  {
1035 1036
    inc_host_errors(&thd->remote.sin_addr);
    return(ER_HANDSHAKE_ERROR);
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1037 1038 1039
  }

  if (thd->client_capabilities & CLIENT_INTERACTIVE)
1040
    thd->variables.net_wait_timeout= thd->variables.net_interactive_timeout;
1041
  if ((thd->client_capabilities & CLIENT_TRANSACTIONS) &&
1042 1043
      opt_using_transactions)
    net->return_status= &thd->server_status;
1044
  net->read_timeout=(uint) thd->variables.net_read_timeout;
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1045

1046 1047
  char *user= end;
  char *passwd= strend(user)+1;
1048
  uint user_len= passwd - user - 1;
1049
  char *db= passwd;
1050 1051
  char db_buff[NAME_LEN + 1];           // buffer to store db in utf8
  char user_buff[USERNAME_LENGTH + 1];	// buffer to store user in utf8
1052 1053 1054
  uint dummy_errors;

  /*
1055 1056 1057 1058
    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'.
  */
1059
  uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ?
1060 1061 1062
    *passwd++ : strlen(passwd);
  db= thd->client_capabilities & CLIENT_CONNECT_WITH_DB ?
    db + passwd_len + 1 : 0;
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1063 1064
  uint db_len= db ? strlen(db) : 0;

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  if (passwd + passwd_len + db_len > (char *)net->read_pos + pkt_len)
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  {
    inc_host_errors(&thd->remote.sin_addr);
    return ER_HANDSHAKE_ERROR;
  }
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1070

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1071 1072
  /* Since 4.1 all database names are stored in utf8 */
  if (db)
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1073
  {
1074 1075
    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
                             system_charset_info,
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                             db, db_len,
1077
                             thd->charset(), &dummy_errors)]= 0;
1078
    db= db_buff;
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1079
  }
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1080

1081 1082 1083
  user_buff[user_len= copy_and_convert(user_buff, sizeof(user_buff)-1,
                                       system_charset_info, user, user_len,
                                       thd->charset(), &dummy_errors)]= '\0';
1084
  user= user_buff;
1085

1086 1087 1088 1089 1090 1091 1092 1093
  /* If username starts and ends in "'", chop them off */
  if (user_len > 1 && user[0] == '\'' && user[user_len - 1] == '\'')
  {
    user[user_len-1]= 0;
    user++;
    user_len-= 2;
  }

1094 1095 1096
  if (thd->main_security_ctx.user)
    x_free(thd->main_security_ctx.user);
  if (!(thd->main_security_ctx.user= my_strdup(user, MYF(0))))
1097
    return (ER_OUT_OF_RESOURCES);
1098
  return check_user(thd, COM_CONNECT, passwd, passwd_len, db, TRUE);
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1099 1100
}

1101

1102 1103
void execute_init_command(THD *thd, sys_var_str *init_command_var,
			  rw_lock_t *var_mutex)
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1104 1105 1106 1107
{
  Vio* save_vio;
  ulong save_client_capabilities;

1108 1109 1110 1111 1112 1113 1114 1115 1116
  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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1117 1118
  save_client_capabilities= thd->client_capabilities;
  thd->client_capabilities|= CLIENT_MULTI_QUERIES;
1119 1120 1121 1122
  /*
    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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1123 1124
  save_vio= thd->net.vio;
  thd->net.vio= 0;
1125
  thd->net.no_send_error= 0;
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1126
  dispatch_command(COM_QUERY, thd, thd->query, thd->query_length+1);
1127
  rw_unlock(var_mutex);
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1128 1129 1130 1131 1132
  thd->client_capabilities= save_client_capabilities;
  thd->net.vio= save_vio;
}


1133
pthread_handler_t handle_one_connection(void *arg)
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1134 1135 1136
{
  THD *thd=(THD*) arg;
  uint launch_time  =
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1137
    (uint) ((thd->thr_create_time = time(NULL)) - thd->connect_time);
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1138 1139 1140 1141 1142
  if (launch_time >= slow_launch_time)
    statistic_increment(slow_launch_threads,&LOCK_status );

  pthread_detach_this_thread();

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1143
#if !defined( __WIN__) // Win32 calls this in pthread_create
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1144
  /* The following calls needs to be done before we call DBUG_ macros */
1145
  if (!(test_flags & TEST_NO_THREADS) & my_thread_init())
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1146
  {
1147
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
1148
    statistic_increment(aborted_connects,&LOCK_status);
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1149 1150 1151 1152 1153
    end_thread(thd,0);
    return 0;
  }
#endif

1154 1155 1156 1157 1158 1159 1160
  /*
    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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1161 1162
  DBUG_PRINT("info", ("handle_one_connection called by thread %d\n",
		      thd->thread_id));
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1163
  /* now that we've called my_thread_init(), it is safe to call DBUG_* */
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1164

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1165
#if defined(__WIN__)
1166
  init_signals();
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1167
#elif !defined(__NETWARE__)
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1168 1169 1170 1171
  sigset_t set;
  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
#endif
1172
  thd->thread_stack= (char*) &thd;
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1173 1174
  if (thd->store_globals())
  {
1175
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
1176
    statistic_increment(aborted_connects,&LOCK_status);
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1177 1178 1179 1180 1181 1182 1183 1184
    end_thread(thd,0);
    return 0;
  }

  do
  {
    int error;
    NET *net= &thd->net;
1185
    Security_context *sctx= thd->security_ctx;
1186
    net->no_send_error= 0;
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1187

1188
    if ((error=check_connection(thd)))
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1189 1190
    {						// Wrong permissions
      if (error > 0)
1191
	net_printf_error(thd, error, sctx->host_or_ip);
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1192 1193
#ifdef __NT__
      if (vio_type(net->vio) == VIO_TYPE_NAMEDPIPE)
1194
	my_sleep(1000);				/* must wait after eof() */
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1195
#endif
1196
      statistic_increment(aborted_connects,&LOCK_status);
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1197 1198
      goto end_thread;
    }
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1199
#ifdef __NETWARE__
1200
    netware_reg_user(sctx->ip, sctx->user, "MySQL");
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1201
#endif
1202
    if (thd->variables.max_join_size == HA_POS_ERROR)
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1203 1204 1205 1206
      thd->options |= OPTION_BIG_SELECTS;
    if (thd->client_capabilities & CLIENT_COMPRESS)
      net->compress=1;				// Use compression

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1207
    thd->version= refresh_version;
1208
    thd->proc_info= 0;
1209
    thd->command= COM_SLEEP;
1210 1211
    thd->set_time();
    thd->init_for_queries();
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1212

1213
    if (sys_init_connect.value_length && !(sctx->master_access & SUPER_ACL))
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1214
    {
1215 1216
      execute_init_command(thd, &sys_init_connect, &LOCK_sys_init_connect);
      if (thd->query_error)
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1217
	thd->killed= THD::KILL_CONNECTION;
1218 1219 1220
      thd->proc_info=0;
      thd->set_time();
      thd->init_for_queries();
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1221 1222
    }

1223 1224
    while (!net->error && net->vio != 0 &&
           !(thd->killed == THD::KILL_CONNECTION))
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1225
    {
1226
      net->no_send_error= 0;
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1227 1228 1229
      if (do_command(thd))
	break;
    }
1230 1231
    if (thd->user_connect)
      decrease_user_connections(thd->user_connect);
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1232
    if (net->error && net->vio != 0 && net->report_error)
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1233
    {
1234
      if (!thd->killed && thd->variables.log_warnings > 1)
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1235
	sql_print_warning(ER(ER_NEW_ABORTING_CONNECTION),
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1236
                          thd->thread_id,(thd->db ? thd->db : "unconnected"),
1237 1238
                          sctx->user ? sctx->user : "unauthenticated",
                          sctx->host_or_ip,
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1239 1240
                          (net->last_errno ? ER(net->last_errno) :
                           ER(ER_UNKNOWN_ERROR)));
1241
      net_send_error(thd, net->last_errno, NullS);
1242
      statistic_increment(aborted_threads,&LOCK_status);
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1243
    }
1244 1245 1246 1247
    else if (thd->killed)
    {
      statistic_increment(aborted_threads,&LOCK_status);
    }
1248
    
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1249
end_thread:
1250
    close_connection(thd, 0, 1);
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1251 1252 1253 1254 1255 1256
    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;
1257
    thd->thread_stack= (char*) &thd;
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1258 1259 1260 1261 1262
  } 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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1263 1264
#endif /* EMBEDDED_LIBRARY */

1265 1266 1267 1268
/*
  Execute commands from bootstrap_file.
  Used when creating the initial grant tables
*/
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1269

1270
pthread_handler_t handle_bootstrap(void *arg)
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1271
{
1272 1273 1274
  THD *thd=(THD*) arg;
  FILE *file=bootstrap_file;
  char *buff;
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1275

1276
  /* The following must be called before DBUG_ENTER */
1277
  thd->thread_stack= (char*) &thd;
1278
  if (my_thread_init() || thd->store_globals())
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1279
  {
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1280
#ifndef EMBEDDED_LIBRARY
1281
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
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1282
#endif
1283
    thd->fatal_error();
1284
    goto end;
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1285
  }
1286 1287
  DBUG_ENTER("handle_bootstrap");

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1288
#ifndef EMBEDDED_LIBRARY
1289 1290
  pthread_detach_this_thread();
  thd->thread_stack= (char*) &thd;
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1291
#if !defined(__WIN__) && !defined(__NETWARE__)
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1292
  sigset_t set;
1293 1294
  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
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1295
#endif
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1296
#endif /* EMBEDDED_LIBRARY */
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1297

1298
  if (thd->variables.max_join_size == HA_POS_ERROR)
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1299 1300 1301 1302
    thd->options |= OPTION_BIG_SELECTS;

  thd->proc_info=0;
  thd->version=refresh_version;
1303 1304
  thd->security_ctx->priv_user=
    thd->security_ctx->user= (char*) my_strdup("boot", MYF(MY_WME));
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1305
  thd->security_ctx->priv_host[0]=0;
1306 1307 1308 1309 1310 1311
  /*
    Make the "client" handle multiple results. This is necessary
    to enable stored procedures with SELECTs and Dynamic SQL
    in init-file.
  */
  thd->client_capabilities|= CLIENT_MULTI_RESULTS;
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1312

1313
  buff= (char*) thd->net.buff;
1314
  thd->init_for_queries();
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1315 1316
  while (fgets(buff, thd->net.max_packet, file))
  {
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1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336
   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;

1337
    while (length && (my_isspace(thd->charset(), buff[length-1]) ||
1338
           buff[length-1] == ';'))
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1339 1340
      length--;
    buff[length]=0;
1341
    thd->query_length=length;
1342 1343
    thd->query= thd->memdup_w_gap(buff, length+1, 
				  thd->db_length+1+QUERY_CACHE_FLAGS_SIZE);
1344
    thd->query[length] = '\0';
1345 1346 1347 1348
    /*
      We don't need to obtain LOCK_thread_count here because in bootstrap
      mode we have only one thread.
    */
1349
    thd->query_id=next_query_id();
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1350 1351
    mysql_parse(thd,thd->query,length);
    close_thread_tables(thd);			// Free tables
1352
    if (thd->is_fatal_error)
1353
      break;
1354
    free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));
1355
#ifdef USING_TRANSACTIONS
1356
    free_root(&thd->transaction.mem_root,MYF(MY_KEEP_PREALLOC));
1357
#endif
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1358
  }
1359 1360 1361

  /* thd->fatal_error should be set in case something went wrong */
end:
1362 1363 1364 1365 1366 1367
  bootstrap_error= thd->is_fatal_error;

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

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1368
#ifndef EMBEDDED_LIBRARY
1369 1370 1371
  (void) pthread_mutex_lock(&LOCK_thread_count);
  thread_count--;
  (void) pthread_mutex_unlock(&LOCK_thread_count);
1372
  (void) pthread_cond_broadcast(&COND_thread_count);
1373 1374
  my_thread_end();
  pthread_exit(0);
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1375
#endif
1376
  DBUG_RETURN(0);
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1377 1378 1379
}


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

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

/* This works because items are allocated with sql_alloc() */
1395 1396 1397

void cleanup_items(Item *item)
{
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1398
  DBUG_ENTER("cleanup_items");  
1399 1400
  for (; item ; item=item->next)
    item->cleanup();
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1401
  DBUG_VOID_RETURN;
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}

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/*
  Handle COM_TABLE_DUMP command

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

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

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

static
int mysql_table_dump(THD* thd, char* db, char* tbl_name)
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1424 1425 1426 1427 1428 1429
{
  TABLE* table;
  TABLE_LIST* table_list;
  int error = 0;
  DBUG_ENTER("mysql_table_dump");
  db = (db && db[0]) ? db : thd->db;
1430
  if (!(table_list = (TABLE_LIST*) thd->calloc(sizeof(TABLE_LIST))))
1431
    DBUG_RETURN(1); // out of memory
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VIEW  
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1432
  table_list->db= db;
1433
  table_list->table_name= table_list->alias= tbl_name;
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VIEW  
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1434 1435
  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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1436

1437 1438
  if (!db || check_db_name(db))
  {
1439
    my_error(ER_WRONG_DB_NAME ,MYF(0), db ? db : "NULL");
1440 1441
    goto err;
  }
1442
  if (lower_case_table_names)
1443
    my_casedn_str(files_charset_info, tbl_name);
1444 1445 1446 1447

  if (!(table=open_ltable(thd, table_list, TL_READ_NO_INSERT)))
    DBUG_RETURN(1);

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1448
  if (check_one_table_access(thd, SELECT_ACL, table_list))
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1449 1450
    goto err;
  thd->free_list = 0;
1451
  thd->query_length=(uint) strlen(tbl_name);
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1452
  thd->query = tbl_name;
1453
  if ((error = mysqld_dump_create_info(thd, table_list, -1)))
1454
  {
1455
    my_error(ER_GET_ERRNO, MYF(0), my_errno);
1456 1457
    goto err;
  }
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1458
  net_flush(&thd->net);
1459
  if ((error= table->file->dump(thd,-1)))
1460
    my_error(ER_GET_ERRNO, MYF(0), error);
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1461

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err:
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  DBUG_RETURN(error);
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1464 1465
}

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

  SYNOPSIS
1470
    end_trans()
1471 1472 1473 1474 1475 1476 1477
      thd            Current thread
      completion     Completion type

  RETURN
    0 - OK
*/

1478
int end_trans(THD *thd, enum enum_mysql_completiontype completion)
1479 1480 1481
{
  bool do_release= 0;
  int res= 0;
1482
  DBUG_ENTER("end_trans");
1483

1484
  if (unlikely(thd->in_sub_stmt))
1485 1486 1487 1488
  {
    my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0));
    DBUG_RETURN(1);
  }
1489 1490 1491 1492 1493 1494
  if (thd->transaction.xid_state.xa_state != XA_NOTR)
  {
    my_error(ER_XAER_RMFAIL, MYF(0),
             xa_state_names[thd->transaction.xid_state.xa_state]);
    DBUG_RETURN(1);
  }
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  switch (completion) {
  case COMMIT:
    /*
     We don't use end_active_trans() here to ensure that this works
     even if there is a problem with the OPTION_AUTO_COMMIT flag
     (Which of course should never happen...)
    */
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
1503
    res= ha_commit(thd);
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    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE |
                             OPTION_KEEP_LOG);
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    break;
  case COMMIT_RELEASE:
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1508
    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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1515
    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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1520
    if (ha_rollback(thd))
1521
      res= -1;
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    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE |
                             OPTION_KEEP_LOG);
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    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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1533

1534 1535 1536
  if (res < 0)
    my_error(thd->killed_errno(), MYF(0));
  else if ((res == 0) && do_release)
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1537 1538
    thd->killed= THD::KILL_CONNECTION;

1539 1540
  DBUG_RETURN(res);
}
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1541

1542
#ifndef EMBEDDED_LIBRARY
1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553

/*
  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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1554 1555 1556
bool do_command(THD *thd)
{
  char *packet;
1557 1558
  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)
  */
1568
  thd->lex->current_select= 0;
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1569 1570

  packet=0;
1571
  old_timeout=net->read_timeout;
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1572
  /* Wait max for 8 hours */
1573
  net->read_timeout=(uint) thd->variables.net_wait_timeout;
1574
  thd->clear_error();				// Clear error message
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1575 1576 1577 1578

  net_new_transaction(net);
  if ((packet_length=my_net_read(net)) == packet_error)
  {
1579 1580 1581 1582 1583
    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)
1584 1585
    {
      statistic_increment(aborted_threads,&LOCK_status);
1586
      DBUG_RETURN(TRUE);			// We have to close it.
1587
    }
1588
    net_send_error(thd, net->last_errno, NullS);
1589
    net->error= 0;
1590
    DBUG_RETURN(FALSE);
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1591 1592 1593 1594 1595
  }
  else
  {
    packet=(char*) net->read_pos;
    command = (enum enum_server_command) (uchar) packet[0];
1596 1597
    if (command >= COM_END)
      command= COM_END;				// Wrong command
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1598 1599 1600
    DBUG_PRINT("info",("Command on %s = %d (%s)",
		       vio_description(net->vio), command,
		       command_name[command]));
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1601
  }
1602
  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.
  */
1612
  DBUG_RETURN(dispatch_command(command,thd, packet+1, (uint) packet_length));
1613
}
1614
#endif  /* EMBEDDED_LIBRARY */
1615

1616

1617 1618
/*
   Perform one connection-level (COM_XXXX) command.
1619

1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632
  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
*/
1633

1634 1635 1636 1637
bool dispatch_command(enum enum_server_command command, THD *thd,
		      char* packet, uint packet_length)
{
  NET *net= &thd->net;
1638
  bool error= 0;
1639 1640
  DBUG_ENTER("dispatch_command");

1641 1642 1643
  if (thd->killed == THD::KILL_QUERY || thd->killed == THD::KILL_BAD_DATA)
    thd->killed= THD::NOT_KILLED;

1644
  thd->command=command;
1645
  /*
1646 1647
    Commands which always take a long time are logged into
    the slow log only if opt_log_slow_admin_statements is set.
1648
  */
1649
  thd->enable_slow_log= TRUE;
1650
  thd->lex->sql_command= SQLCOM_END; /* to avoid confusing VIEW detectors */
1651
  thd->set_time();
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1652 1653 1654
  VOID(pthread_mutex_lock(&LOCK_thread_count));
  thd->query_id=query_id;
  if (command != COM_STATISTICS && command != COM_PING)
1655
    next_query_id();
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1656
  thread_running++;
1657
  /* TODO: set thd->lex->sql_command to SQLCOM_END here */
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1658
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
1659

1660 1661
  thd->server_status&=
           ~(SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED);
1662
  switch (command) {
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1663
  case COM_INIT_DB:
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1664 1665
  {
    LEX_STRING tmp;
1666 1667
    statistic_increment(thd->status_var.com_stat[SQLCOM_CHANGE_DB],
			&LOCK_status);
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1668 1669
    thd->convert_string(&tmp, system_charset_info,
			packet, strlen(packet), thd->charset());
1670 1671
    if (!mysql_change_db(thd, tmp.str, FALSE))
    {
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1672
      general_log_print(thd, command, "%s",thd->db);
1673 1674
      send_ok(thd);
    }
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    break;
  }
1677
#ifdef HAVE_REPLICATION
1678 1679
  case COM_REGISTER_SLAVE:
  {
1680
    if (!register_slave(thd, (uchar*)packet, packet_length))
1681
      send_ok(thd);
1682 1683
    break;
  }
1684
#endif
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1685
  case COM_TABLE_DUMP:
1686 1687 1688
  {
    char *db, *tbl_name;
    uint db_len= *(uchar*) packet;
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1689
    if (db_len >= packet_length || db_len > NAME_LEN)
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1690
    {
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1691
      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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      break;
    }
1694
    uint tbl_len= *(uchar*) (packet + db_len + 1);
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1695 1696
    if (db_len+tbl_len+2 > packet_length || tbl_len > NAME_LEN)
    {
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1697
      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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1698 1699
      break;
    }
1700

1701
    statistic_increment(thd->status_var.com_other, &LOCK_status);
1702
    thd->enable_slow_log= opt_log_slow_admin_statements;
1703
    db= thd->alloc(db_len + tbl_len + 2);
1704 1705 1706 1707 1708
    if (!db)
    {
      my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
      break;
    }
1709 1710
    tbl_name= strmake(db, packet + 1, db_len)+1;
    strmake(tbl_name, packet + db_len + 2, tbl_len);
1711
    mysql_table_dump(thd, db, tbl_name);
1712 1713
    break;
  }
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1714 1715
  case COM_CHANGE_USER:
  {
1716
    thd->change_user();
1717
    thd->clear_error();                         // if errors from rollback
1718

1719
    statistic_increment(thd->status_var.com_other, &LOCK_status);
1720
    char *user= (char*) packet;
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1721
    char *passwd= strend(user)+1;
1722
    /*
1723 1724 1725 1726
      Old clients send null-terminated string ('\0' for empty string) for
      password.  New clients send the size (1 byte) + string (not null
      terminated, so also '\0' for empty string).
    */
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1727
    char db_buff[NAME_LEN+1];               // buffer to store db in utf8
1728
    char *db= passwd;
1729
    uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ?
1730 1731
      *passwd++ : strlen(passwd);
    db+= passwd_len + 1;
1732
#ifndef EMBEDDED_LIBRARY
1733
    /* Small check for incoming packet */
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1734
    if ((uint) ((uchar*) db - net->read_pos) > packet_length)
1735
    {
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1736
      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
1737 1738
      break;
    }
1739
#endif
1740
    /* Convert database name to utf8 */
1741
    uint dummy_errors;
1742 1743
    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
                             system_charset_info, db, strlen(db),
1744
                             thd->charset(), &dummy_errors)]= 0;
1745
    db= db_buff;
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1746

1747 1748 1749
    /* Save user and privileges */
    uint save_db_length= thd->db_length;
    char *save_db= thd->db;
1750
    Security_context save_security_ctx= *thd->security_ctx;
1751
    USER_CONN *save_user_connect= thd->user_connect;
1752 1753

    if (!(thd->security_ctx->user= my_strdup(user, MYF(0))))
1754
    {
1755
      thd->security_ctx->user= save_security_ctx.user;
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1756
      my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
1757 1758
      break;
    }
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1759

1760 1761
    /* Clear variables that are allocated */
    thd->user_connect= 0;
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1762
    int res= check_user(thd, COM_CHANGE_USER, passwd, passwd_len, db, FALSE);
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1763

1764 1765
    if (res)
    {
1766
      /* authentication failure, we shall restore old user */
1767
      if (res > 0)
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1768
        my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
1769 1770
      x_free(thd->security_ctx->user);
      *thd->security_ctx= save_security_ctx;
1771
      thd->user_connect= save_user_connect;
1772 1773 1774 1775 1776
      thd->db= save_db;
      thd->db_length= save_db_length;
    }
    else
    {
1777
#ifndef NO_EMBEDDED_ACCESS_CHECKS
1778
      /* we've authenticated new user */
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1779 1780
      if (save_user_connect)
	decrease_user_connections(save_user_connect);
1781
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
1782
      x_free((gptr) save_db);
1783
      x_free((gptr)  save_security_ctx.user);
1784
    }
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1785 1786
    break;
  }
1787
  case COM_STMT_EXECUTE:
1788
  {
1789
    mysql_stmt_execute(thd, packet, packet_length);
1790 1791
    break;
  }
1792
  case COM_STMT_FETCH:
1793 1794 1795 1796
  {
    mysql_stmt_fetch(thd, packet, packet_length);
    break;
  }
1797
  case COM_STMT_SEND_LONG_DATA:
1798
  {
1799
    mysql_stmt_get_longdata(thd, packet, packet_length);
1800 1801
    break;
  }
1802
  case COM_STMT_PREPARE:
1803
  {
1804
    mysql_stmt_prepare(thd, packet, packet_length);
1805 1806
    break;
  }
1807
  case COM_STMT_CLOSE:
1808
  {
1809
    mysql_stmt_close(thd, packet);
1810 1811
    break;
  }
1812
  case COM_STMT_RESET:
1813 1814 1815 1816
  {
    mysql_stmt_reset(thd, packet);
    break;
  }
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1817 1818
  case COM_QUERY:
  {
1819 1820
    if (alloc_query(thd, packet, packet_length))
      break;					// fatal error is set
1821
    char *packet_end= thd->query + thd->query_length;
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1822
    general_log_print(thd, command, "%.*b", thd->query_length, thd->query);
1823
    DBUG_PRINT("query",("%-.4096s",thd->query));
1824 1825 1826 1827

    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),QUERY_PRIOR);

1828
    mysql_parse(thd,thd->query, thd->query_length);
1829

1830
    while (!thd->killed && thd->lex->found_semicolon && !thd->net.report_error)
1831
    {
1832
      char *packet= thd->lex->found_semicolon;
1833
      net->no_send_error= 0;
1834
      /*
1835 1836
        Multiple queries exits, execute them individually
      */
1837 1838
      if (thd->lock || thd->open_tables || thd->derived_tables ||
          thd->prelocked_mode)
1839
        close_thread_tables(thd);
1840
      ulong length= (ulong)(packet_end-packet);
1841

1842
      log_slow_statement(thd);
1843

1844
      /* Remove garbage at start of query */
1845
      while (my_isspace(thd->charset(), *packet) && length > 0)
1846 1847 1848 1849
      {
        packet++;
        length--;
      }
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1850
      VOID(pthread_mutex_lock(&LOCK_thread_count));
1851
      thd->query_length= length;
1852
      thd->query= packet;
1853
      thd->query_id= next_query_id();
1854
      thd->set_time(); /* Reset the query start time. */
1855
      /* TODO: set thd->lex->sql_command to SQLCOM_END here */
1856
      VOID(pthread_mutex_unlock(&LOCK_thread_count));
1857 1858 1859
      mysql_parse(thd, packet, length);
    }

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1860 1861 1862 1863 1864
    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),WAIT_PRIOR);
    DBUG_PRINT("info",("query ready"));
    break;
  }
1865
  case COM_FIELD_LIST:				// This isn't actually needed
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1866
#ifdef DONT_ALLOW_SHOW_COMMANDS
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1867 1868
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0));	/* purecov: inspected */
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1869 1870 1871
    break;
#else
  {
1872
    char *fields, *pend;
1873 1874
    /* Locked closure of all tables */
    TABLE_LIST *locked_tables= NULL;
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1875
    TABLE_LIST table_list;
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1876
    LEX_STRING conv_name;
1877
    /* Saved variable value */
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1878 1879 1880
    my_bool old_innodb_table_locks=  thd->variables.innodb_table_locks;


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1881 1882
    /* used as fields initializator */
    lex_start(thd, 0, 0);
1883

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1884

1885 1886
    statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_FIELDS],
			&LOCK_status);
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1887
    bzero((char*) &table_list,sizeof(table_list));
1888
    if (thd->copy_db_to(&table_list.db, 0))
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1889
      break;
1890
    pend= strend(packet);
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1891 1892
    thd->convert_string(&conv_name, system_charset_info,
			packet, (uint) (pend-packet), thd->charset());
1893
    table_list.alias= table_list.table_name= conv_name.str;
1894
    packet= pend+1;
1895 1896 1897 1898 1899 1900 1901 1902 1903

    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;
    }

1904
    thd->query_length= strlen(packet);       // for simplicity: don't optimize
1905 1906
    if (!(thd->query=fields=thd->memdup(packet,thd->query_length+1)))
      break;
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1907
    general_log_print(thd, command, "%s %s", table_list.table_name, fields);
1908
    if (lower_case_table_names)
1909
      my_casedn_str(files_charset_info, table_list.table_name);
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1910

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1911
    if (check_access(thd,SELECT_ACL,table_list.db,&table_list.grant.privilege,
1912
		     0, 0, test(table_list.schema_table)))
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1913
      break;
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1914 1915
    if (grant_option &&
	check_grant(thd, SELECT_ACL, &table_list, 2, UINT_MAX, 0))
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1916
      break;
1917 1918 1919 1920 1921 1922
    /* 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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1923
    thd->lex->add_to_query_tables(&table_list);
1924

1925 1926
    /* switch on VIEW optimisation: do not fill temporary tables */
    thd->lex->sql_command= SQLCOM_SHOW_FIELDS;
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1927
    mysqld_list_fields(thd,&table_list,fields);
1928
    thd->lex->unit.cleanup();
1929
    thd->cleanup_after_query();
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1930 1931 1932 1933
    break;
  }
#endif
  case COM_QUIT:
1934
    /* We don't calculate statistics for this command */
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1935
    general_log_print(thd, command, NullS);
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1936 1937 1938 1939
    net->error=0;				// Don't give 'abort' message
    error=TRUE;					// End server
    break;

1940
  case COM_CREATE_DB:				// QQ: To be removed
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1941
    {
1942
      char *db=thd->strdup(packet), *alias;
1943
      HA_CREATE_INFO create_info;
1944

1945 1946
      statistic_increment(thd->status_var.com_stat[SQLCOM_CREATE_DB],
			  &LOCK_status);
1947
      // null test to handle EOM
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1948
      if (!db || !(alias= thd->strdup(db)) || check_db_name(db))
1949
      {
1950
	my_error(ER_WRONG_DB_NAME, MYF(0), db ? db : "NULL");
1951 1952
	break;
      }
1953
      if (check_access(thd,CREATE_ACL,db,0,1,0,is_schema_db(db)))
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1954
	break;
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1955
      general_log_print(thd, command, packet);
1956
      bzero(&create_info, sizeof(create_info));
1957 1958
      mysql_create_db(thd, (lower_case_table_names == 2 ? alias : db),
                      &create_info, 0);
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1959 1960
      break;
    }
1961
  case COM_DROP_DB:				// QQ: To be removed
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1962
    {
1963 1964
      statistic_increment(thd->status_var.com_stat[SQLCOM_DROP_DB],
			  &LOCK_status);
1965
      char *db=thd->strdup(packet);
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1966
      /*  null test to handle EOM */
1967
      if (!db || check_db_name(db))
1968
      {
1969
	my_error(ER_WRONG_DB_NAME, MYF(0), db ? db : "NULL");
1970 1971
	break;
      }
1972
      if (check_access(thd,DROP_ACL,db,0,1,0,is_schema_db(db)))
1973
	break;
1974 1975
      if (thd->locked_tables || thd->active_transaction())
      {
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1976 1977
	my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                   ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
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1978
	break;
1979
      }
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1980
      general_log_print(thd, command, db);
1981
      mysql_rm_db(thd, db, 0, 0);
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1982 1983
      break;
    }
1984
#ifndef EMBEDDED_LIBRARY
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1985 1986
  case COM_BINLOG_DUMP:
    {
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1987 1988 1989 1990
      ulong pos;
      ushort flags;
      uint32 slave_server_id;

1991
      statistic_increment(thd->status_var.com_other,&LOCK_status);
1992
      thd->enable_slow_log= opt_log_slow_admin_statements;
1993
      if (check_global_access(thd, REPL_SLAVE_ACL))
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1994
	break;
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1995

1996
      /* TODO: The following has to be changed to an 8 byte integer */
1997 1998
      pos = uint4korr(packet);
      flags = uint2korr(packet + 4);
1999
      thd->server_id=0; /* avoid suicide */
2000
      if ((slave_server_id= uint4korr(packet+6))) // mysqlbinlog.server_id==0
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2001
	kill_zombie_dump_threads(slave_server_id);
2002
      thd->server_id = slave_server_id;
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2003

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2004
      general_log_print(thd, command, "Log: '%s'  Pos: %ld", packet+10,
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2005
                      (long) pos);
2006
      mysql_binlog_send(thd, thd->strdup(packet + 10), (my_off_t) pos, flags);
2007
      unregister_slave(thd,1,1);
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2008
      /*  fake COM_QUIT -- if we get here, the thread needs to terminate */
2009 2010
      error = TRUE;
      net->error = 0;
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2011 2012
      break;
    }
2013
#endif
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2014
  case COM_REFRESH:
2015 2016 2017 2018 2019 2020
  {
    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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2021
      break;
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2022
    general_log_print(thd, command, NullS);
2023 2024 2025 2026
    if (!reload_acl_and_cache(thd, options, (TABLE_LIST*) 0, &not_used))
      send_ok(thd);
    break;
  }
2027
#ifndef EMBEDDED_LIBRARY
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2028
  case COM_SHUTDOWN:
2029
  {
2030
    statistic_increment(thd->status_var.com_other, &LOCK_status);
2031
    if (check_global_access(thd,SHUTDOWN_ACL))
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2032
      break; /* purecov: inspected */
2033
    /*
2034 2035 2036 2037
      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].
2038
    */
2039 2040
    enum mysql_enum_shutdown_level level=
      (enum mysql_enum_shutdown_level) (uchar) packet[0];
2041
    DBUG_PRINT("quit",("Got shutdown command for level %u", level));
2042 2043 2044 2045 2046 2047 2048
    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;
    }
2049
    DBUG_PRINT("quit",("Got shutdown command for level %u", level));
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2050
    general_log_print(thd, command, NullS);
2051
    send_eof(thd);
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2052 2053 2054
#ifdef __WIN__
    sleep(1);					// must wait after eof()
#endif
2055
    send_eof(thd);				// This is for 'quit request'
2056
    close_connection(thd, 0, 1);
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2057 2058 2059 2060
    close_thread_tables(thd);			// Free before kill
    kill_mysql();
    error=TRUE;
    break;
2061
  }
2062
#endif
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2063 2064
  case COM_STATISTICS:
  {
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2065
    general_log_print(thd, command, NullS);
2066 2067
    statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_STATUS],
			&LOCK_status);
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2068
#ifndef EMBEDDED_LIBRARY
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2069
    char buff[200];
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2070 2071 2072
#else
    char *buff= thd->net.last_error;
#endif
2073 2074 2075 2076

    STATUS_VAR current_global_status_var;
    calc_sum_of_all_status(&current_global_status_var);

2077
    ulong uptime = (ulong) (thd->start_time - start_time);
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2078
    sprintf((char*) buff,
2079
	    "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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2080
	    uptime,
2081
	    (int) thread_count, (ulong) thd->query_id,
2082
	    current_global_status_var.long_query_count,
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2083 2084
	    current_global_status_var.opened_tables, refresh_version,
            cached_open_tables(),
2085 2086
	    (uptime ? (ulonglong2double(thd->query_id) / (double) uptime) :
	     (double) 0));
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2087
#ifdef SAFEMALLOC
2088
    if (sf_malloc_cur_memory)				// Using SAFEMALLOC
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2089
      sprintf(strend(buff), "  Memory in use: %ldK  Max memory used: %ldK",
2090 2091
	      (sf_malloc_cur_memory+1023L)/1024L,
	      (sf_malloc_max_memory+1023L)/1024L);
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2092 2093
#endif
#ifndef EMBEDDED_LIBRARY
2094
    VOID(my_net_write(net, buff,(uint) strlen(buff)));
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2095
    VOID(net_flush(net));
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2096
#endif
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2097 2098 2099
    break;
  }
  case COM_PING:
2100
    statistic_increment(thd->status_var.com_other, &LOCK_status);
2101
    send_ok(thd);				// Tell client we are alive
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2102 2103
    break;
  case COM_PROCESS_INFO:
2104 2105
    statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_PROCESSLIST],
			&LOCK_status);
2106 2107
    if (!thd->security_ctx->priv_user[0] &&
        check_global_access(thd, PROCESS_ACL))
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2108
      break;
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2109
    general_log_print(thd, command, NullS);
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2110
    mysqld_list_processes(thd,
2111 2112
			  thd->security_ctx->master_access & PROCESS_ACL ? 
			  NullS : thd->security_ctx->priv_user, 0);
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2113 2114 2115
    break;
  case COM_PROCESS_KILL:
  {
2116
    statistic_increment(thd->status_var.com_stat[SQLCOM_KILL], &LOCK_status);
2117
    ulong id=(ulong) uint4korr(packet);
2118
    sql_kill(thd,id,false);
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2119 2120
    break;
  }
2121 2122
  case COM_SET_OPTION:
  {
2123 2124
    statistic_increment(thd->status_var.com_stat[SQLCOM_SET_OPTION],
			&LOCK_status);
2125 2126 2127 2128
    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;
2129
      send_eof(thd);
2130 2131 2132
      break;
    case MYSQL_OPTION_MULTI_STATEMENTS_OFF:
      thd->client_capabilities&= ~CLIENT_MULTI_STATEMENTS;
2133
      send_eof(thd);
2134 2135
      break;
    default:
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2136
      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
2137 2138 2139 2140
      break;
    }
    break;
  }
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2141
  case COM_DEBUG:
2142
    statistic_increment(thd->status_var.com_other, &LOCK_status);
2143
    if (check_global_access(thd, SUPER_ACL))
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2144
      break;					/* purecov: inspected */
2145
    mysql_print_status();
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2146
    general_log_print(thd, command, NullS);
2147
    send_eof(thd);
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2148 2149 2150 2151 2152
    break;
  case COM_SLEEP:
  case COM_CONNECT:				// Impossible here
  case COM_TIME:				// Impossible from client
  case COM_DELAYED_INSERT:
2153
  case COM_END:
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2154
  default:
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2155
    my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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2156 2157
    break;
  }
2158 2159
  if (thd->lock || thd->open_tables || thd->derived_tables ||
      thd->prelocked_mode)
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2160 2161 2162 2163
  {
    thd->proc_info="closing tables";
    close_thread_tables(thd);			/* Free tables */
  }
2164 2165 2166 2167 2168 2169 2170 2171 2172 2173
  /*
    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())
2174
    thd->transaction.xid_state.xid.null();
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2175

2176 2177 2178
  /* report error issued during command execution */
  if (thd->killed_errno() && !thd->net.report_error)
    thd->send_kill_message();
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2179
  if (thd->net.report_error)
2180
    net_send_error(thd);
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2181

2182
  log_slow_statement(thd);
2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197

  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);
}


2198
void log_slow_statement(THD *thd)
2199
{
2200
  time_t start_of_query;
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2201
  DBUG_ENTER("log_slow_statement");
2202 2203 2204 2205 2206 2207 2208

  /*
    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))
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2209
    DBUG_VOID_RETURN;                           // Don't set time for sub stmt
2210 2211

  start_of_query= thd->start_time;
2212
  thd->end_time();				// Set start time
2213

2214 2215 2216 2217 2218
  /*
    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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2219
  {
2220 2221
    thd->proc_info="logging slow query";

2222 2223
    if ((ulong) (thd->start_time - thd->time_after_lock) >
	thd->variables.long_query_time ||
2224 2225
	((thd->server_status &
	  (SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED)) &&
2226
	 (specialflag & SPECIAL_LOG_QUERIES_NOT_USING_INDEXES)))
2227
    {
2228
      thd->status_var.long_query_count++;
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2229
      slow_log_print(thd, thd->query, thd->query_length, start_of_query);
2230
    }
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2231
  }
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2232
  DBUG_VOID_RETURN;
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2233 2234
}

2235

2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263
/*
  Create a TABLE_LIST object for an INFORMATION_SCHEMA table.

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

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

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

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

2264 2265 2266 2267 2268
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;
2269
  switch (schema_table_idx) {
2270 2271
  case SCH_SCHEMATA:
#if defined(DONT_ALLOW_SHOW_COMMANDS)
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2272 2273
    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0));   /* purecov: inspected */
2274 2275 2276 2277 2278 2279 2280 2281 2282 2283
    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:
2284
  case SCH_TRIGGERS:
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2285
  case SCH_EVENTS:
2286
#ifdef DONT_ALLOW_SHOW_COMMANDS
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2287 2288
    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */
2289 2290 2291
    DBUG_RETURN(1);
#else
    {
2292 2293 2294
      char *db;
      if (lex->select_lex.db == NULL &&
          thd->copy_db_to(&lex->select_lex.db, 0))
2295
      {
2296
        DBUG_RETURN(1);
2297
      }
2298
      db= lex->select_lex.db;
2299 2300
      if (check_db_name(db))
      {
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2301
        my_error(ER_WRONG_DB_NAME, MYF(0), db);
2302 2303
        DBUG_RETURN(1);
      }
2304 2305
      if (check_access(thd, SELECT_ACL, db, &thd->col_access, 0, 0,
                       is_schema_db(db)))
2306 2307 2308
        DBUG_RETURN(1);			        /* purecov: inspected */
      if (!thd->col_access && check_grant_db(thd,db))
      {
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2309
	my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
2310 2311
                 thd->security_ctx->priv_user, thd->security_ctx->priv_host,
                 db);
2312 2313 2314 2315 2316 2317 2318 2319
	DBUG_RETURN(1);
      }
      break;
    }
#endif
  case SCH_COLUMNS:
  case SCH_STATISTICS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
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2320 2321
    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */
2322 2323 2324 2325 2326 2327
    DBUG_RETURN(1);
#else
    if (table_ident)
    {
      TABLE_LIST **query_tables_last= lex->query_tables_last;
      sel= new SELECT_LEX();
2328 2329
      /* 'parent_lex' is used in init_query() so it must be before it. */
      sel->parent_lex= lex;
2330
      sel->init_query();
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2331
      if (!sel->add_table_to_list(thd, table_ident, 0, 0, TL_READ, 
2332 2333 2334 2335 2336 2337
                                 (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;
      if (check_access(thd,SELECT_ACL | EXTRA_ACL,db,
2338 2339
                       &table_list->grant.privilege, 0, 0,
                       test(table_list->schema_table)))
2340 2341 2342 2343 2344 2345 2346
        DBUG_RETURN(1);				/* purecov: inspected */
      if (grant_option && check_grant(thd, SELECT_ACL, table_list, 2,
                                      UINT_MAX, 0))
        DBUG_RETURN(1);
      break;
    }
#endif
2347 2348 2349
  case SCH_OPEN_TABLES:
  case SCH_VARIABLES:
  case SCH_STATUS:
2350 2351
  case SCH_PROCEDURES:
  case SCH_CHARSETS:
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2352
  case SCH_ENGINES:
2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371
  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;
2372
  table_list->schema_table_reformed= 1;
2373 2374 2375 2376
  DBUG_RETURN(0);
}


2377 2378
/*
  Read query from packet and store in thd->query
2379
  Used in COM_QUERY and COM_STMT_PREPARE
2380 2381 2382 2383 2384 2385 2386

  DESCRIPTION
    Sets the following THD variables:
      query
      query_length

  RETURN VALUES
2387 2388
    FALSE ok
    TRUE  error;  In this case thd->fatal_error is set
2389 2390
*/

2391
bool alloc_query(THD *thd, const char *packet, uint packet_length)
2392 2393
{
  packet_length--;				// Remove end null
2394
  /* Remove garbage at start and end of query */
2395
  while (my_isspace(thd->charset(),packet[0]) && packet_length > 0)
2396 2397 2398 2399
  {
    packet++;
    packet_length--;
  }
2400
  const char *pos= packet + packet_length;     // Point at end null
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2401
  while (packet_length > 0 &&
2402
	 (pos[-1] == ';' || my_isspace(thd->charset() ,pos[-1])))
2403 2404 2405 2406 2407
  {
    pos--;
    packet_length--;
  }
  /* We must allocate some extra memory for query cache */
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2408
  thd->query_length= 0;                        // Extra safety: Avoid races
2409 2410
  if (!(thd->query= (char*) thd->memdup_w_gap((gptr) (packet),
					      packet_length,
2411 2412
					      thd->db_length+ 1 +
					      QUERY_CACHE_FLAGS_SIZE)))
2413
    return TRUE;
2414 2415
  thd->query[packet_length]=0;
  thd->query_length= packet_length;
2416 2417 2418 2419

  /* Reclaim some memory */
  thd->packet.shrink(thd->variables.net_buffer_length);
  thd->convert_buffer.shrink(thd->variables.net_buffer_length);
2420

2421
  return FALSE;
2422 2423
}

2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439
static void reset_one_shot_variables(THD *thd) 
{
  thd->variables.character_set_client=
    global_system_variables.character_set_client;
  thd->variables.collation_connection=
    global_system_variables.collation_connection;
  thd->variables.collation_database=
    global_system_variables.collation_database;
  thd->variables.collation_server=
    global_system_variables.collation_server;
  thd->update_charset();
  thd->variables.time_zone=
    global_system_variables.time_zone;
  thd->one_shot_set= 0;
}

2440

2441
/*
2442
  Execute command saved in thd and lex->sql_command
2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463

  SYNOPSIS
    mysql_execute_command()
      thd                       Thread handle

  IMPLEMENTATION

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

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

  RETURN
    FALSE       OK
    TRUE        Error
*/
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2464

2465
bool
2466
mysql_execute_command(THD *thd)
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2467
{
2468 2469 2470 2471
  bool res= FALSE;
  bool need_start_waiting= FALSE; // have protection against global read lock
  int  result= 0;
  LEX  *lex= thd->lex;
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2472
  /* first SELECT_LEX (have special meaning for many of non-SELECTcommands) */
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2473
  SELECT_LEX *select_lex= &lex->select_lex;
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2474
  /* first table of first SELECT_LEX */
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2475
  TABLE_LIST *first_table= (TABLE_LIST*) select_lex->table_list.first;
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2476 2477 2478
  /* list of all tables in query */
  TABLE_LIST *all_tables;
  /* most outer SELECT_LEX_UNIT of query */
2479
  SELECT_LEX_UNIT *unit= &lex->unit;
2480
  /* Saved variable value */
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2481
  DBUG_ENTER("mysql_execute_command");
2482
  thd->net.no_send_error= 0;
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2483 2484 2485
#ifdef WITH_PARTITION_STORAGE_ENGINE
  thd->work_part_info= 0;
#endif
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2486

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2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502
  /*
    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();
2503
  /* should be assigned after making first tables same */
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2504
  all_tables= lex->query_tables;
2505 2506 2507 2508
  /* 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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2509

2510 2511 2512 2513 2514
  /*
    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.
2515
    Don't reset warnings when executing a stored routine.
2516
  */
2517
  if ((all_tables || &lex->select_lex != lex->all_selects_list ||
2518
       lex->sroutines.records) && !thd->spcont ||
2519
      lex->time_zone_tables_used)
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2520
    mysql_reset_errors(thd, 0);
2521

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SCRUM  
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2522
#ifdef HAVE_REPLICATION
2523
  if (unlikely(thd->slave_thread))
2524
  {
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2525
    /*
2526 2527
      Check if statment should be skipped because of slave filtering
      rules
2528 2529

      Exceptions are:
2530 2531
      - UPDATE MULTI: For this statement, we want to check the filtering
        rules later in the code
2532
      - SET: we always execute it (Not that many SET commands exists in
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2533 2534
        the binary log anyway -- only 4.1 masters write SET statements,
	in 5.0 there are no SET statements in the binary log)
2535 2536
      - 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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2537
    */
2538 2539
    if (!(lex->sql_command == SQLCOM_UPDATE_MULTI) &&
	!(lex->sql_command == SQLCOM_SET_OPTION) &&
2540
	!(lex->sql_command == SQLCOM_DROP_TABLE &&
2541
          lex->drop_temporary && lex->drop_if_exists) &&
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Merge  
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2542
        all_tables_not_ok(thd, all_tables))
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2543 2544
    {
      /* we warn the slave SQL thread */
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2545
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
2546
      reset_one_shot_variables(thd);
2547
      DBUG_RETURN(0);
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2548
    }
2549
  }
2550
  else
2551
  {
2552
#endif /* HAVE_REPLICATION */
2553 2554 2555 2556 2557 2558
    /*
      When option readonly is set deny operations which change non-temporary
      tables. Except for the replication thread and the 'super' users.
    */
    if (opt_readonly &&
	!(thd->security_ctx->master_access & SUPER_ACL) &&
2559
	(sql_command_flags[lex->sql_command] & CF_CHANGES_DATA) &&
2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570
	!((lex->sql_command == SQLCOM_CREATE_TABLE) &&
	  (lex->create_info.options & HA_LEX_CREATE_TMP_TABLE)) &&
	((lex->sql_command != SQLCOM_UPDATE_MULTI) &&
	 some_non_temp_table_to_be_updated(thd, all_tables)))
    {
      my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only");
      DBUG_RETURN(-1);
    }
#ifdef HAVE_REPLICATION
  } /* endif unlikely slave */
#endif
2571 2572
  statistic_increment(thd->status_var.com_stat[lex->sql_command],
                      &LOCK_status);
2573

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2574
  switch (lex->sql_command) {
2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613
  case SQLCOM_SHOW_EVENTS:
    if ((res= check_access(thd, EVENT_ACL, thd->lex->select_lex.db, 0, 0, 0,
                           is_schema_db(thd->lex->select_lex.db))))
      break;
    /* fall through */
  case SQLCOM_SHOW_STATUS_PROC:
  case SQLCOM_SHOW_STATUS_FUNC:
    res= execute_sqlcom_select(thd, all_tables);
    break;
  case SQLCOM_SHOW_STATUS:
  {
    system_status_var old_status_var= thd->status_var;
    thd->initial_status_var= &old_status_var;
    res= execute_sqlcom_select(thd, all_tables);
    /* Don't log SHOW STATUS commands to slow query log */
    thd->server_status&= ~(SERVER_QUERY_NO_INDEX_USED |
                           SERVER_QUERY_NO_GOOD_INDEX_USED);
    /*
      restore status variables, as we don't want 'show status' to cause
      changes
    */
    pthread_mutex_lock(&LOCK_status);
    add_diff_to_status(&global_status_var, &thd->status_var,
                       &old_status_var);
    thd->status_var= old_status_var;
    pthread_mutex_unlock(&LOCK_status);
    break;
  }
  case SQLCOM_SHOW_DATABASES:
  case SQLCOM_SHOW_TABLES:
  case SQLCOM_SHOW_TRIGGERS:
  case SQLCOM_SHOW_TABLE_STATUS:
  case SQLCOM_SHOW_OPEN_TABLES:
  case SQLCOM_SHOW_PLUGINS:
  case SQLCOM_SHOW_FIELDS:
  case SQLCOM_SHOW_KEYS:
  case SQLCOM_SHOW_VARIABLES:
  case SQLCOM_SHOW_CHARSETS:
  case SQLCOM_SHOW_COLLATIONS:
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2614
  case SQLCOM_SELECT:
2615
    thd->status_var.last_query_cost= 0.0;
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2616
    if (all_tables)
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2617
    {
2618 2619 2620 2621
      res= check_table_access(thd,
                              lex->exchange ? SELECT_ACL | FILE_ACL :
                              SELECT_ACL,
                              all_tables, 0);
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2622 2623
    }
    else
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2624
      res= check_access(thd,
2625 2626 2627 2628
                        lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL,
                        any_db, 0, 0, 0, 0);
    if (!res)
      res= execute_sqlcom_select(thd, all_tables);
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2629
    break;
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2630
  case SQLCOM_PREPARE:
2631
  {
2632
    mysql_sql_stmt_prepare(thd);
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2633 2634 2635 2636
    break;
  }
  case SQLCOM_EXECUTE:
  {
2637
    mysql_sql_stmt_execute(thd);
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2638 2639 2640 2641
    break;
  }
  case SQLCOM_DEALLOCATE_PREPARE:
  {
2642
    mysql_sql_stmt_close(thd);
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2643 2644
    break;
  }
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2645
  case SQLCOM_DO:
2646 2647
    if (check_table_access(thd, SELECT_ACL, all_tables, 0) ||
        open_and_lock_tables(thd, all_tables))
2648
      goto error;
2649 2650

    res= mysql_do(thd, *lex->insert_list);
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2651 2652
    break;

2653
  case SQLCOM_EMPTY_QUERY:
2654
    send_ok(thd);
2655 2656
    break;

2657 2658 2659 2660
  case SQLCOM_HELP:
    res= mysqld_help(thd,lex->help_arg);
    break;

2661
#ifndef EMBEDDED_LIBRARY
2662
  case SQLCOM_PURGE:
2663
  {
2664
    if (check_global_access(thd, SUPER_ACL))
2665
      goto error;
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2666
    /* PURGE MASTER LOGS TO 'file' */
2667 2668 2669
    res = purge_master_logs(thd, lex->to_log);
    break;
  }
2670 2671
  case SQLCOM_PURGE_BEFORE:
  {
2672 2673
    Item *it;

2674 2675
    if (check_global_access(thd, SUPER_ACL))
      goto error;
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2676
    /* PURGE MASTER LOGS BEFORE 'data' */
2677
    it= (Item *)lex->value_list.head();
2678
    if ((!it->fixed && it->fix_fields(lex->thd, &it)) ||
2679
        it->check_cols(1))
2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690
    {
      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());
2691 2692
    break;
  }
2693
#endif
2694 2695
  case SQLCOM_SHOW_WARNS:
  {
2696 2697
    res= mysqld_show_warnings(thd, (ulong)
			      ((1L << (uint) MYSQL_ERROR::WARN_LEVEL_NOTE) |
2698 2699 2700
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_WARN) |
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR)
			       ));
2701 2702 2703 2704
    break;
  }
  case SQLCOM_SHOW_ERRORS:
  {
2705 2706
    res= mysqld_show_warnings(thd, (ulong)
			      (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR));
2707 2708
    break;
  }
2709 2710
  case SQLCOM_SHOW_NEW_MASTER:
  {
2711
    if (check_global_access(thd, REPL_SLAVE_ACL))
2712
      goto error;
2713
    /* This query don't work now. See comment in repl_failsafe.cc */
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2714
#ifndef WORKING_NEW_MASTER
2715 2716
    my_error(ER_NOT_SUPPORTED_YET, MYF(0), "SHOW NEW MASTER");
    goto error;
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2717
#else
2718 2719
    res = show_new_master(thd);
    break;
2720
#endif
2721
  }
2722

2723
#ifdef HAVE_REPLICATION
2724 2725
  case SQLCOM_SHOW_SLAVE_HOSTS:
  {
2726
    if (check_global_access(thd, REPL_SLAVE_ACL))
2727 2728 2729 2730
      goto error;
    res = show_slave_hosts(thd);
    break;
  }
2731 2732
  case SQLCOM_SHOW_BINLOG_EVENTS:
  {
2733
    if (check_global_access(thd, REPL_SLAVE_ACL))
2734
      goto error;
2735
    res = mysql_show_binlog_events(thd);
2736 2737
    break;
  }
2738 2739
#endif

2740
  case SQLCOM_BACKUP_TABLE:
2741
  {
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bell@sanja.is.com.ua committed
2742
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2743
    if (check_table_access(thd, SELECT_ACL, all_tables, 0) ||
2744
	check_global_access(thd, FILE_ACL))
2745
      goto error; /* purecov: inspected */
2746
    thd->enable_slow_log= opt_log_slow_admin_statements;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2747
    res = mysql_backup_table(thd, first_table);
2748
    select_lex->table_list.first= (byte*) first_table;
2749
    lex->query_tables=all_tables;
2750 2751
    break;
  }
2752
  case SQLCOM_RESTORE_TABLE:
2753
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2754
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2755
    if (check_table_access(thd, INSERT_ACL, all_tables, 0) ||
2756
	check_global_access(thd, FILE_ACL))
2757
      goto error; /* purecov: inspected */
2758
    thd->enable_slow_log= opt_log_slow_admin_statements;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2759
    res = mysql_restore_table(thd, first_table);
2760
    select_lex->table_list.first= (byte*) first_table;
2761
    lex->query_tables=all_tables;
2762 2763
    break;
  }
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2764 2765
  case SQLCOM_ASSIGN_TO_KEYCACHE:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2766
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2767
    if (check_access(thd, INDEX_ACL, first_table->db,
2768 2769
                     &first_table->grant.privilege, 0, 0,
                     test(first_table->schema_table)))
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2770
      goto error;
2771
    res= mysql_assign_to_keycache(thd, first_table, &lex->ident);
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2772 2773
    break;
  }
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2774 2775
  case SQLCOM_PRELOAD_KEYS:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2776
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2777
    if (check_access(thd, INDEX_ACL, first_table->db,
2778 2779
                     &first_table->grant.privilege, 0, 0,
                     test(first_table->schema_table)))
2780
      goto error;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2781
    res = mysql_preload_keys(thd, first_table);
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2782 2783
    break;
  }
2784
#ifdef HAVE_REPLICATION
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2785
  case SQLCOM_CHANGE_MASTER:
2786
  {
2787
    if (check_global_access(thd, SUPER_ACL))
2788
      goto error;
2789
    pthread_mutex_lock(&LOCK_active_mi);
2790
    res = change_master(thd,active_mi);
2791
    pthread_mutex_unlock(&LOCK_active_mi);
2792 2793
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2794
  case SQLCOM_SHOW_SLAVE_STAT:
2795
  {
2796 2797
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2798
      goto error;
2799
    pthread_mutex_lock(&LOCK_active_mi);
2800
    res = show_master_info(thd,active_mi);
2801
    pthread_mutex_unlock(&LOCK_active_mi);
2802 2803
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2804
  case SQLCOM_SHOW_MASTER_STAT:
2805
  {
2806 2807
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2808 2809 2810 2811
      goto error;
    res = show_binlog_info(thd);
    break;
  }
peter@mysql.com's avatar
peter@mysql.com committed
2812

2813
  case SQLCOM_LOAD_MASTER_DATA: // sync with master
2814
    if (check_global_access(thd, SUPER_ACL))
2815
      goto error;
2816
    if (end_active_trans(thd))
2817
      goto error;
2818
    res = load_master_data(thd);
2819
    break;
2820
#endif /* HAVE_REPLICATION */
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
2821
  case SQLCOM_SHOW_ENGINE_STATUS:
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2822
    {
2823
      if (check_global_access(thd, SUPER_ACL))
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
2824 2825
        goto error;
      res = ha_show_status(thd, lex->create_info.db_type, HA_ENGINE_STATUS);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2826 2827
      break;
    }
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
2828
  case SQLCOM_SHOW_ENGINE_MUTEX:
vtkachenko@intelp4d.mysql.com's avatar
vtkachenko@intelp4d.mysql.com committed
2829 2830
    {
      if (check_global_access(thd, SUPER_ACL))
vtkachenko@intelp4d.mysql.com's avatar
vtkachenko@intelp4d.mysql.com committed
2831
        goto error;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
2832
      res = ha_show_status(thd, lex->create_info.db_type, HA_ENGINE_MUTEX);
vtkachenko@intelp4d.mysql.com's avatar
vtkachenko@intelp4d.mysql.com committed
2833 2834
      break;
    }
2835
#ifdef HAVE_REPLICATION
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2836
  case SQLCOM_LOAD_MASTER_TABLE:
2837
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2838
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2839 2840
    DBUG_ASSERT(first_table->db); /* Must be set in the parser */

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2841
    if (check_access(thd, CREATE_ACL, first_table->db,
2842 2843
		     &first_table->grant.privilege, 0, 0,
                     test(first_table->schema_table)))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2844 2845 2846 2847
      goto error;				/* purecov: inspected */
    if (grant_option)
    {
      /* Check that the first table has CREATE privilege */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2848
      if (check_grant(thd, CREATE_ACL, all_tables, 0, 1, 0))
2849
	goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2850
    }
2851
    if (strlen(first_table->table_name) > NAME_LEN)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2852
    {
2853
      my_error(ER_WRONG_TABLE_NAME, MYF(0), first_table->table_name);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2854 2855
      break;
    }
2856
    pthread_mutex_lock(&LOCK_active_mi);
2857 2858 2859 2860
    /*
      fetch_master_table will send the error to the client on failure.
      Give error if the table already exists.
    */
2861
    if (!fetch_master_table(thd, first_table->db, first_table->table_name,
2862
			    active_mi, 0, 0))
2863
    {
2864
      send_ok(thd);
2865
    }
2866
    pthread_mutex_unlock(&LOCK_active_mi);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2867
    break;
2868
  }
2869
#endif /* HAVE_REPLICATION */
2870

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2871
  case SQLCOM_CREATE_TABLE:
2872
  {
2873
    /* If CREATE TABLE of non-temporary table, do implicit commit */
2874 2875 2876 2877 2878 2879 2880 2881
    if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE))
    {
      if (end_active_trans(thd))
      {
	res= -1;
	break;
      }
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2882 2883 2884 2885 2886
    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;
monty@mysql.com's avatar
monty@mysql.com committed
2887

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2888
    if ((res= create_table_precheck(thd, select_tables, create_table)))
monty@mysql.com's avatar
monty@mysql.com committed
2889
      goto end_with_restore_list;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2890

2891 2892 2893
#ifndef HAVE_READLINK
    lex->create_info.data_file_name=lex->create_info.index_file_name=0;
#else
2894
    /* Fix names if symlinked tables */
2895
    if (append_file_to_dir(thd, &lex->create_info.data_file_name,
2896
			   create_table->table_name) ||
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2897
	append_file_to_dir(thd, &lex->create_info.index_file_name,
2898
			   create_table->table_name))
monty@mysql.com's avatar
monty@mysql.com committed
2899
      goto end_with_restore_list;
2900
#endif
2901
    /*
2902
      If we are using SET CHARSET without DEFAULT, add an implicit
2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913
      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;
    }
2914 2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926
    /*
      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.
    */
2927 2928
    if (!thd->locked_tables &&
        !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
2929
    {
monty@mysql.com's avatar
monty@mysql.com committed
2930 2931
      res= 1;
      goto end_with_restore_list;
2932
    }
2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943
#ifdef WITH_PARTITION_STORAGE_ENGINE
    {
      partition_info *part_info= thd->lex->part_info;
      if (part_info && !(part_info= thd->lex->part_info->get_clone()))
      {
        res= -1;
        goto end_with_restore_list;
      }
      thd->work_part_info= part_info;
    }
#endif
2944
    if (select_lex->item_list.elements)		// With select
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2945 2946
    {
      select_result *result;
2947

2948
      select_lex->options|= SELECT_NO_UNLOCK;
2949
      unit->set_limit(select_lex);
2950

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2951
      if (!(res= open_and_lock_tables(thd, select_tables)))
2952
      {
2953 2954 2955 2956
        /*
          Is table which we are changing used somewhere in other parts
          of query
        */
2957
        if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE))
2958
        {
2959
          TABLE_LIST *duplicate;
2960
          if ((duplicate= unique_table(thd, create_table, select_tables)))
2961 2962 2963
          {
            update_non_unique_table_error(create_table, "CREATE", duplicate);
            res= 1;
2964
            goto end_with_restore_list;
2965
          }
2966
        }
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2967 2968 2969 2970 2971 2972 2973 2974
        /* 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)
          {
2975
            TABLE_LIST *duplicate;
2976
            if ((duplicate= unique_table(thd, tab, select_tables)))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2977
            {
2978
              update_non_unique_table_error(tab, "CREATE", duplicate);
monty@mysql.com's avatar
monty@mysql.com committed
2979
              res= 1;
2980
              goto end_with_restore_list;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2981 2982 2983
            }
          }
        }
2984

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2985 2986 2987 2988 2989
        if ((result= new select_create(create_table,
				       &lex->create_info,
				       lex->create_list,
				       lex->key_list,
				       select_lex->item_list,
2990 2991
				       lex->duplicates,
				       lex->ignore)))
2992 2993 2994 2995 2996
        {
          /*
            CREATE from SELECT give its SELECT_LEX for SELECT,
            and item_list belong to SELECT
          */
2997
          res= handle_select(thd, lex, result, 0);
2998
          delete result;
2999
        }
monty@mysql.com's avatar
monty@mysql.com committed
3000
	/* reset for PS */
3001 3002
	lex->create_list.empty();
	lex->key_list.empty();
3003 3004
      }
    }
monty@mysql.com's avatar
monty@mysql.com committed
3005
    else
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3006
    {
3007 3008 3009
      /* So that CREATE TEMPORARY TABLE gets to binlog at commit/rollback */
      if (lex->create_info.options & HA_LEX_CREATE_TMP_TABLE)
        thd->options|= OPTION_KEEP_LOG;
monty@mysql.com's avatar
monty@mysql.com committed
3010
      /* regular create */
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3011
      if (lex->like_name)
monty@mysql.com's avatar
monty@mysql.com committed
3012
        res= mysql_create_like_table(thd, create_table, &lex->create_info, 
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3013
                                     lex->like_name); 
venu@myvenu.com's avatar
venu@myvenu.com committed
3014
      else
3015
      {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3016
        res= mysql_create_table(thd, create_table->db,
3017
				create_table->table_name, &lex->create_info,
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3018
				lex->create_list,
3019
				lex->key_list, 0, 0, 1);
3020
      }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3021
      if (!res)
3022
	send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3023
    }
3024

monty@mysql.com's avatar
monty@mysql.com committed
3025
    /* put tables back for PS rexecuting */
monty@mysql.com's avatar
monty@mysql.com committed
3026
end_with_restore_list:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3027
    lex->link_first_table_back(create_table, link_to_local);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3028
    break;
3029
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3030
  case SQLCOM_CREATE_INDEX:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3031 3032
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_one_table_access(thd, INDEX_ACL, all_tables))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3033
      goto error; /* purecov: inspected */
3034
    thd->enable_slow_log= opt_log_slow_admin_statements;
3035
    if (end_active_trans(thd))
3036
      goto error;
3037
    res= mysql_create_index(thd, first_table, lex->key_list);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3038 3039
    break;

3040
#ifdef HAVE_REPLICATION
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3041
  case SQLCOM_SLAVE_START:
3042
  {
3043
    pthread_mutex_lock(&LOCK_active_mi);
3044
    start_slave(thd,active_mi,1 /* net report*/);
3045
    pthread_mutex_unlock(&LOCK_active_mi);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3046
    break;
3047
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3048
  case SQLCOM_SLAVE_STOP:
3049 3050 3051 3052 3053 3054
  /*
    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,
3055
      so it waits for the client thread because t is locked by it.
3056
    - then the client thread does SLAVE STOP.
3057 3058
      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.
3059 3060 3061
    To prevent that, refuse SLAVE STOP if the
    client thread has locked tables
  */
3062
  if (thd->locked_tables || thd->active_transaction() || thd->global_read_lock)
3063
  {
3064 3065
    my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
               ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3066
    goto error;
3067
  }
3068
  {
3069
    pthread_mutex_lock(&LOCK_active_mi);
3070
    stop_slave(thd,active_mi,1/* net report*/);
3071
    pthread_mutex_unlock(&LOCK_active_mi);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3072
    break;
3073
  }
3074
#endif /* HAVE_REPLICATION */
3075

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3076
  case SQLCOM_ALTER_TABLE:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3077
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3078
#if defined(DONT_ALLOW_SHOW_COMMANDS)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3079 3080
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
3081
    goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3082 3083
#else
    {
3084
      ulong priv=0;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3085 3086 3087 3088 3089
      ulong priv_needed= ALTER_ACL;
      /* We also require DROP priv for ALTER TABLE ... DROP PARTITION */
      if (lex->alter_info.flags & ALTER_DROP_PARTITION)
        priv_needed|= DROP_ACL;

Sinisa@sinisa.nasamreza.org's avatar
Sinisa@sinisa.nasamreza.org committed
3090
      if (lex->name && (!lex->name[0] || strlen(lex->name) > NAME_LEN))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3091
      {
3092
	my_error(ER_WRONG_TABLE_NAME, MYF(0), lex->name);
3093
        goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3094
      }
3095 3096
      /* Must be set in the parser */
      DBUG_ASSERT(select_lex->db);
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3097
      if (check_access(thd, priv_needed, first_table->db,
3098 3099 3100 3101
		       &first_table->grant.privilege, 0, 0,
                       test(first_table->schema_table)) ||
	  check_access(thd,INSERT_ACL | CREATE_ACL,select_lex->db,&priv,0,0,
                       is_schema_db(select_lex->db))||
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3102
	  check_merge_table_access(thd, first_table->db,
3103 3104 3105
				   (TABLE_LIST *)
				   lex->create_info.merge_list.first))
	goto error;				/* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3106 3107
      if (grant_option)
      {
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3108
	if (check_grant(thd, priv_needed, all_tables, 0, UINT_MAX, 0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3109 3110 3111 3112 3113
	  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));
3114
	  tmp_table.table_name=lex->name;
3115
	  tmp_table.db=select_lex->db;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3116
	  tmp_table.grant.privilege=priv;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3117 3118
	  if (check_grant(thd, INSERT_ACL | CREATE_ACL, &tmp_table, 0,
			  UINT_MAX, 0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3119 3120 3121
	    goto error;
	}
      }
3122
      /* Don't yet allow changing of symlinks with ALTER TABLE */
3123 3124 3125 3126 3127 3128
      if (lex->create_info.data_file_name)
        push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
                     "DATA DIRECTORY option ignored");
      if (lex->create_info.index_file_name)
        push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
                     "INDEX DIRECTORY option ignored");
3129
      lex->create_info.data_file_name=lex->create_info.index_file_name=0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3130
      /* ALTER TABLE ends previous transaction */
3131
      if (end_active_trans(thd))
3132
	goto error;
3133

3134 3135 3136 3137 3138
      if (!thd->locked_tables &&
          !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
      {
        res= 1;
        break;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3139
      }
3140

3141 3142 3143 3144 3145 3146 3147
      thd->enable_slow_log= opt_log_slow_admin_statements;
      res= mysql_alter_table(thd, select_lex->db, lex->name,
                             &lex->create_info,
                             first_table, lex->create_list,
                             lex->key_list,
                             select_lex->order_list.elements,
                             (ORDER *) select_lex->order_list.first,
3148
                             lex->ignore, &lex->alter_info, 1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3149 3150
      break;
    }
hf@deer.(none)'s avatar
hf@deer.(none) committed
3151
#endif /*DONT_ALLOW_SHOW_COMMANDS*/
3152
  case SQLCOM_RENAME_TABLE:
3153
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3154
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3155
    TABLE_LIST *table;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3156
    for (table= first_table; table; table= table->next_local->next_local)
3157
    {
monty@donna.mysql.com's avatar
monty@donna.mysql.com committed
3158
      if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
3159
		       &table->grant.privilege,0,0, test(table->schema_table)) ||
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3160
	  check_access(thd, INSERT_ACL | CREATE_ACL, table->next_local->db,
3161 3162
		       &table->next_local->grant.privilege, 0, 0,
                       test(table->next_local->schema_table)))
3163 3164 3165
	goto error;
      if (grant_option)
      {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3166
	TABLE_LIST old_list, new_list;
3167 3168 3169 3170
	/*
	  we do not need initialize old_list and new_list because we will
	  come table[0] and table->next[0] there
	*/
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3171 3172 3173 3174
	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,
3175
			    INSERT_ACL | CREATE_ACL) &&
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3176
	     check_grant(thd, INSERT_ACL | CREATE_ACL, &new_list, 0, 1, 0)))
3177 3178 3179
	  goto error;
      }
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3180
    query_cache_invalidate3(thd, first_table, 0);
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3181
    if (end_active_trans(thd) || mysql_rename_tables(thd, first_table, 0))
3182
      goto error;
3183
    break;
3184
  }
3185
#ifndef EMBEDDED_LIBRARY
3186 3187
  case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3188 3189
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
3190
    goto error;
3191 3192
#else
    {
3193
      if (check_global_access(thd, SUPER_ACL))
3194 3195 3196 3197
	goto error;
      res = show_binlogs(thd);
      break;
    }
peter@mysql.com's avatar
peter@mysql.com committed
3198
#endif
3199
#endif /* EMBEDDED_LIBRARY */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3200
  case SQLCOM_SHOW_CREATE:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3201
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3202
#ifdef DONT_ALLOW_SHOW_COMMANDS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3203 3204
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
3205
    goto error;
3206
#else
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3207
    {
3208 3209 3210 3211
      /* Ignore temporary tables if this is "SHOW CREATE VIEW" */
      if (lex->only_view)
        first_table->skip_temporary= 1;

3212
      if (check_access(thd, SELECT_ACL | EXTRA_ACL, first_table->db,
3213 3214
		       &first_table->grant.privilege, 0, 0, 
                       test(first_table->schema_table)))
3215
	goto error;
monty@mishka.local's avatar
monty@mishka.local committed
3216
      if (grant_option && check_grant(thd, SELECT_ACL, all_tables, 2, UINT_MAX, 0))
3217
	goto error;
monty@mishka.local's avatar
monty@mishka.local committed
3218
      res= mysqld_show_create(thd, first_table);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3219 3220
      break;
    }
3221
#endif
3222 3223
  case SQLCOM_CHECKSUM:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3224
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3225
    if (check_table_access(thd, SELECT_ACL | EXTRA_ACL, all_tables, 0))
3226
      goto error; /* purecov: inspected */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3227
    res = mysql_checksum_table(thd, first_table, &lex->check_opt);
3228 3229
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3230
  case SQLCOM_REPAIR:
3231
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3232
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3233
    if (check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
3234
      goto error; /* purecov: inspected */
3235
    thd->enable_slow_log= opt_log_slow_admin_statements;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3236
    res= mysql_repair_table(thd, first_table, &lex->check_opt);
3237 3238 3239 3240 3241
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      if (mysql_bin_log.is_open())
      {
3242
	thd->clear_error(); // No binlog error generated
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3243 3244
        thd->binlog_query(THD::STMT_QUERY_TYPE,
                          thd->query, thd->query_length, 0, FALSE);
3245 3246
      }
    }
3247
    select_lex->table_list.first= (byte*) first_table;
3248
    lex->query_tables=all_tables;
3249 3250
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3251
  case SQLCOM_CHECK:
3252
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3253
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3254
    if (check_table_access(thd, SELECT_ACL | EXTRA_ACL , all_tables, 0))
3255
      goto error; /* purecov: inspected */
3256
    thd->enable_slow_log= opt_log_slow_admin_statements;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3257
    res = mysql_check_table(thd, first_table, &lex->check_opt);
3258
    select_lex->table_list.first= (byte*) first_table;
3259
    lex->query_tables=all_tables;
3260 3261
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3262 3263
  case SQLCOM_ANALYZE:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3264
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3265
    if (check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3266
      goto error; /* purecov: inspected */
3267
    thd->enable_slow_log= opt_log_slow_admin_statements;
3268
    res= mysql_analyze_table(thd, first_table, &lex->check_opt);
3269 3270 3271 3272 3273
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      if (mysql_bin_log.is_open())
      {
3274
	thd->clear_error(); // No binlog error generated
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3275 3276
        thd->binlog_query(THD::STMT_QUERY_TYPE,
                          thd->query, thd->query_length, 0, FALSE);
3277 3278
      }
    }
3279
    select_lex->table_list.first= (byte*) first_table;
3280
    lex->query_tables=all_tables;
3281
    break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3282
  }
3283

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3284 3285
  case SQLCOM_OPTIMIZE:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3286
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3287
    if (check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3288
      goto error; /* purecov: inspected */
3289
    thd->enable_slow_log= opt_log_slow_admin_statements;
3290
    res= (specialflag & (SPECIAL_SAFE_MODE | SPECIAL_NO_NEW_FUNC)) ?
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3291 3292
      mysql_recreate_table(thd, first_table, 1) :
      mysql_optimize_table(thd, first_table, &lex->check_opt);
3293 3294 3295 3296 3297
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      if (mysql_bin_log.is_open())
      {
3298
	thd->clear_error(); // No binlog error generated
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3299 3300
        thd->binlog_query(THD::STMT_QUERY_TYPE,
                          thd->query, thd->query_length, 0, FALSE);
3301 3302
      }
    }
3303
    select_lex->table_list.first= (byte*) first_table;
3304
    lex->query_tables=all_tables;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3305 3306 3307
    break;
  }
  case SQLCOM_UPDATE:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3308 3309
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (update_precheck(thd, all_tables))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3310
      break;
3311 3312
    DBUG_ASSERT(select_lex->offset_limit == 0);
    unit->set_limit(select_lex);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3313 3314 3315 3316 3317 3318
    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,
3319
                               unit->select_limit_cnt,
3320
                               lex->duplicates, lex->ignore));
3321
    /* mysql_update return 2 if we need to switch to multi-update */
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3322
    if (result != 2)
3323
      break;
3324
  case SQLCOM_UPDATE_MULTI:
3325 3326 3327 3328
  {
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    /* if we switched from normal update, rights are checked */
    if (result != 2)
3329
    {
3330 3331 3332 3333 3334
      if ((res= multi_update_precheck(thd, all_tables)))
        break;
    }
    else
      res= 0;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3335

3336
    res= mysql_multi_update_prepare(thd);
3337

3338
#ifdef HAVE_REPLICATION
3339
    /* Check slave filtering rules */
3340
    if (unlikely(thd->slave_thread))
3341
    {
3342 3343
      if (all_tables_not_ok(thd, all_tables))
      {
3344 3345 3346 3347 3348
        if (res!= 0)
        {
          res= 0;             /* don't care of prev failure  */
          thd->clear_error(); /* filters are of highest prior */
        }
3349 3350 3351 3352
        /* we warn the slave SQL thread */
        my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
        break;
      }
3353 3354
      if (res)
        break;
3355
    }
3356 3357
    else
    {
3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370
#endif /* HAVE_REPLICATION */
      if (res)
        break;
      if (opt_readonly &&
	  !(thd->security_ctx->master_access & SUPER_ACL) &&
	  some_non_temp_table_to_be_updated(thd, all_tables))
      {
	my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only");
	break;
      }
#ifdef HAVE_REPLICATION
    }  /* unlikely */
#endif
3371

3372 3373 3374 3375 3376 3377
    res= mysql_multi_update(thd, all_tables,
                            &select_lex->item_list,
                            &lex->value_list,
                            select_lex->where,
                            select_lex->options,
                            lex->duplicates, lex->ignore, unit, select_lex);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3378
    break;
monty@mysql.com's avatar
monty@mysql.com committed
3379
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3380
  case SQLCOM_REPLACE:
3381 3382
  case SQLCOM_INSERT:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3383
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
monty@mysql.com's avatar
monty@mysql.com committed
3384
    if ((res= insert_precheck(thd, all_tables)))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3385
      break;
3386 3387 3388 3389 3390 3391 3392 3393

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

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3394
    res= mysql_insert(thd, all_tables, lex->field_list, lex->many_values,
monty@mishka.local's avatar
monty@mishka.local committed
3395
		      lex->update_list, lex->value_list,
3396
                      lex->duplicates, lex->ignore);
3397
    /* do not show last insert ID if VIEW does not have auto_inc */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3398
    if (first_table->view && !first_table->contain_auto_increment)
3399
      thd->first_successful_insert_id_in_cur_stmt= 0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3400
    break;
3401
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3402 3403 3404
  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
  {
monty@mysql.com's avatar
monty@mysql.com committed
3405
    select_result *result;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3406
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
monty@mishka.local's avatar
monty@mishka.local committed
3407
    if ((res= insert_precheck(thd, all_tables)))
3408
      break;
monty@mysql.com's avatar
monty@mysql.com committed
3409

3410
    /* Fix lock for first table */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3411 3412
    if (first_table->lock_type == TL_WRITE_DELAYED)
      first_table->lock_type= TL_WRITE;
3413

3414 3415
    /* Don't unlock tables until command is written to binary log */
    select_lex->options|= SELECT_NO_UNLOCK;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3416

3417
    unit->set_limit(select_lex);
3418 3419 3420 3421 3422 3423 3424 3425

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

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3426
    if (!(res= open_and_lock_tables(thd, all_tables)))
3427
    {
3428
      /* Skip first table, which is the table we are inserting in */
3429 3430
      TABLE_LIST *second_table= first_table->next_local;
      select_lex->table_list.first= (byte*) second_table;
3431 3432
      select_lex->context.table_list= 
        select_lex->context.first_name_resolution_table= second_table;
3433 3434 3435
      res= mysql_insert_select_prepare(thd);
      if (!res && (result= new select_insert(first_table, first_table->table,
                                             &lex->field_list,
3436 3437
                                             &lex->update_list,
                                             &lex->value_list,
3438
                                             lex->duplicates, lex->ignore)))
3439
      {
3440
	res= handle_select(thd, lex, result, OPTION_SETUP_TABLES_DONE);
3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453
        /*
          Invalidate the table in the query cache if something changed
          after unlocking when changes become visible.
          TODO: this is workaround. right way will be move invalidating in
          the unlock procedure.
        */
        if (first_table->lock_type ==  TL_WRITE_CONCURRENT_INSERT &&
            thd->lock)
        {
          mysql_unlock_tables(thd, thd->lock);
          query_cache_invalidate3(thd, first_table, 1);
          thd->lock=0;
        }
3454 3455
        delete result;
      }
3456
      /* revert changes for SP */
msvensson@neptunus.(none)'s avatar
msvensson@neptunus.(none) committed
3457
      select_lex->table_list.first= (byte*) first_table;
3458
    }
3459
    /* do not show last insert ID if VIEW does not have auto_inc */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3460
    if (first_table->view && !first_table->contain_auto_increment)
3461
      thd->first_successful_insert_id_in_cur_stmt= 0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3462 3463
    break;
  }
3464
  case SQLCOM_TRUNCATE:
3465 3466 3467 3468 3469
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3470 3471
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_one_table_access(thd, DELETE_ACL, all_tables))
3472
      goto error;
3473 3474 3475 3476
    /*
      Don't allow this within a transaction because we want to use
      re-generate table
    */
3477
    if (thd->locked_tables || thd->active_transaction())
3478
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3479 3480
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3481 3482
      goto error;
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3483

monty@mysql.com's avatar
monty@mysql.com committed
3484
    res= mysql_truncate(thd, first_table, 0);
3485
    break;
3486
  case SQLCOM_DELETE:
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3487
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3488 3489
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if ((res= delete_precheck(thd, all_tables)))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3490
      break;
3491 3492
    DBUG_ASSERT(select_lex->offset_limit == 0);
    unit->set_limit(select_lex);
3493 3494 3495 3496 3497 3498 3499 3500

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

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3501
    res = mysql_delete(thd, all_tables, select_lex->where,
3502
                       &select_lex->order_list,
osku@127.(none)'s avatar
osku@127.(none) committed
3503 3504
                       unit->select_limit_cnt, select_lex->options,
                       FALSE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3505 3506
    break;
  }
3507
  case SQLCOM_DELETE_MULTI:
3508
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3509
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3510
    TABLE_LIST *aux_tables=
3511
      (TABLE_LIST *)thd->lex->auxiliary_table_list.first;
3512
    multi_delete *result;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3513

3514 3515 3516 3517 3518 3519 3520
    if (!thd->locked_tables &&
        !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
    {
      res= 1;
      break;
    }

3521
    if ((res= multi_delete_precheck(thd, all_tables)))
3522
      break;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3523

3524
    /* condition will be TRUE on SP re-excuting */
3525 3526
    if (select_lex->item_list.elements != 0)
      select_lex->item_list.empty();
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
3527
    if (add_item_to_list(thd, new Item_null()))
3528
      goto error;
3529

3530
    thd->proc_info="init";
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3531 3532 3533 3534
    if ((res= open_and_lock_tables(thd, all_tables)))
      break;

    if ((res= mysql_multi_delete_prepare(thd)))
3535
      goto error;
3536

3537
    if (!thd->is_fatal_error && (result= new multi_delete(aux_tables,
3538
							  lex->table_count)))
3539
    {
3540 3541 3542
      res= mysql_select(thd, &select_lex->ref_pointer_array,
			select_lex->get_table_list(),
			select_lex->with_wild,
3543
			select_lex->item_list,
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3544
			select_lex->where,
3545
			0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3546 3547
			(ORDER *)NULL,
			select_lex->options | thd->options |
3548 3549
			SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK |
                        OPTION_SETUP_TABLES_DONE,
3550
			result, unit, select_lex);
3551
      delete result;
3552 3553
    }
    else
3554
      res= TRUE;                                // Error
3555 3556
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3557
  case SQLCOM_DROP_TABLE:
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
3558
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3559
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3560 3561
    if (!lex->drop_temporary)
    {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3562
      if (check_table_access(thd, DROP_ACL, all_tables, 0))
3563 3564
	goto error;				/* purecov: inspected */
      if (end_active_trans(thd))
3565
        goto error;
3566
    }
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
3567
    else
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
3568 3569 3570 3571 3572 3573
    {
      /*
	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.
monty@mysql.com's avatar
monty@mysql.com committed
3574 3575
	To not generate such irrelevant "table does not exist errors",
	we silently add IF EXISTS if TEMPORARY was used.
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
3576 3577 3578
      */
      if (thd->slave_thread)
	lex->drop_if_exists= 1;
3579

3580
      /* So that DROP TEMPORARY TABLE gets to binlog at commit/rollback */
3581
      thd->options|= OPTION_KEEP_LOG;
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
3582
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3583 3584
    res= mysql_rm_table(thd, first_table, lex->drop_if_exists,
			lex->drop_temporary);
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
3585 3586
  }
  break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3587
  case SQLCOM_DROP_INDEX:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3588 3589
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_one_table_access(thd, INDEX_ACL, all_tables))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3590
      goto error;				/* purecov: inspected */
3591
    if (end_active_trans(thd))
3592
      goto error;
3593
    res= mysql_drop_index(thd, first_table, &lex->alter_info);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3594 3595
    break;
  case SQLCOM_SHOW_PROCESSLIST:
3596 3597
    if (!thd->security_ctx->priv_user[0] &&
        check_global_access(thd,PROCESS_ACL))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3598
      break;
hf@deer.(none)'s avatar
hf@deer.(none) committed
3599
    mysqld_list_processes(thd,
3600 3601 3602 3603
			  (thd->security_ctx->master_access & PROCESS_ACL ?
                           NullS :
                           thd->security_ctx->priv_user),
                          lex->verbose);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3604
    break;
3605 3606
  case SQLCOM_SHOW_STORAGE_ENGINES:
    res= mysqld_show_storage_engines(thd);
3607
    break;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3608 3609 3610
  case SQLCOM_SHOW_AUTHORS:
    res= mysqld_show_authors(thd);
    break;
3611 3612 3613
  case SQLCOM_SHOW_CONTRIBUTORS:
    res= mysqld_show_contributors(thd);
    break;
3614 3615 3616 3617 3618 3619
  case SQLCOM_SHOW_PRIVILEGES:
    res= mysqld_show_privileges(thd);
    break;
  case SQLCOM_SHOW_COLUMN_TYPES:
    res= mysqld_show_column_types(thd);
    break;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3620
  case SQLCOM_SHOW_ENGINE_LOGS:
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
3621
#ifdef DONT_ALLOW_SHOW_COMMANDS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3622 3623
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0));	/* purecov: inspected */
3624
    goto error;
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
3625 3626
#else
    {
3627
      if (grant_option && check_access(thd, FILE_ACL, any_db,0,0,0,0))
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
3628
	goto error;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3629
      res= ha_show_status(thd, lex->create_info.db_type, HA_ENGINE_LOGS);
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
3630 3631
      break;
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3632 3633
#endif
  case SQLCOM_CHANGE_DB:
3634 3635
    if (!mysql_change_db(thd,select_lex->db,FALSE))
      send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3636
    break;
3637

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3638 3639
  case SQLCOM_LOAD:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3640
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3641
    uint privilege= (lex->duplicates == DUP_REPLACE ?
3642 3643
		     INSERT_ACL | DELETE_ACL : INSERT_ACL) |
                    (lex->local_file ? 0 : FILE_ACL);
3644

3645
    if (lex->local_file)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3646
    {
3647
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
3648
          !opt_local_infile)
3649
      {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3650
	my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND), MYF(0));
3651 3652
	goto error;
      }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3653
    }
3654 3655 3656 3657

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

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3658
    res= mysql_load(thd, lex->exchange, first_table, lex->field_list,
3659
                    lex->update_list, lex->value_list, lex->duplicates,
3660
                    lex->ignore, (bool) lex->local_file);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3661 3662
    break;
  }
3663

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3664
  case SQLCOM_SET_OPTION:
3665 3666
  {
    List<set_var_base> *lex_var_list= &lex->var_list;
3667
    if ((check_table_access(thd, SELECT_ACL, all_tables, 0) ||
3668 3669
	 open_and_lock_tables(thd, all_tables)))
      goto error;
3670 3671
    if (lex->one_shot_set && not_all_support_one_shot(lex_var_list))
    {
3672 3673
      my_error(ER_RESERVED_SYNTAX, MYF(0), "SET ONE_SHOT");
      goto error;
3674 3675 3676 3677 3678 3679 3680 3681
    }
    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;
3682
      send_ok(thd);
3683
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3684
    break;
3685
  }
3686

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3687
  case SQLCOM_UNLOCK_TABLES:
3688 3689 3690 3691 3692 3693
    /*
      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.
    */
3694
    unlock_locked_tables(thd);
3695 3696
    if (thd->options & OPTION_TABLE_LOCK)
    {
3697
      end_active_trans(thd);
3698
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3699 3700
    }
    if (thd->global_read_lock)
3701
      unlock_global_read_lock(thd);
3702
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3703 3704
    break;
  case SQLCOM_LOCK_TABLES:
3705
    unlock_locked_tables(thd);
3706
    if (end_active_trans(thd))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3707
      goto error;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3708
    if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, all_tables, 0))
3709
      goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3710
    thd->in_lock_tables=1;
3711
    thd->options|= OPTION_TABLE_LOCK;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3712

3713
    if (!(res= simple_open_n_lock_tables(thd, all_tables)))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3714
    {
3715 3716
#ifdef HAVE_QUERY_CACHE
      if (thd->variables.query_cache_wlock_invalidate)
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3717
	query_cache.invalidate_locked_for_write(first_table);
3718
#endif /*HAVE_QUERY_CACHE*/
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3719 3720
      thd->locked_tables=thd->lock;
      thd->lock=0;
3721
      send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3722
    }
3723 3724
    else
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3725 3726 3727
    thd->in_lock_tables=0;
    break;
  case SQLCOM_CREATE_DB:
3728
  {
3729 3730 3731 3732 3733
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
3734
    char *alias;
vva@eagle.mysql.r18.ru's avatar
vva@eagle.mysql.r18.ru committed
3735
    if (!(alias=thd->strdup(lex->name)) || check_db_name(lex->name))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3736
    {
3737
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3738 3739
      break;
    }
3740 3741 3742
    /*
      If in a slave thread :
      CREATE DATABASE DB was certainly not preceded by USE DB.
3743
      For that reason, db_ok() in sql/slave.cc did not check the
3744 3745 3746
      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.
    */
3747
#ifdef HAVE_REPLICATION
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3748 3749 3750
    if (thd->slave_thread && 
	(!rpl_filter->db_ok(lex->name) ||
	 !rpl_filter->db_ok_with_wild_table(lex->name)))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3751
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3752
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
3753
      break;
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3754
    }
3755
#endif
3756
    if (check_access(thd,CREATE_ACL,lex->name,0,1,0,is_schema_db(lex->name)))
3757
      break;
monty@mysql.com's avatar
monty@mysql.com committed
3758
    res= mysql_create_db(thd,(lower_case_table_names == 2 ? alias : lex->name),
monty@mysql.com's avatar
monty@mysql.com committed
3759
			 &lex->create_info, 0);
3760 3761
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3762
  case SQLCOM_DROP_DB:
3763
  {
3764 3765 3766 3767 3768
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
3769
    if (check_db_name(lex->name))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3770
    {
3771
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3772 3773
      break;
    }
3774 3775 3776 3777 3778 3779 3780
    /*
      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.
    */
3781
#ifdef HAVE_REPLICATION
3782
    if (thd->slave_thread && 
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3783 3784
	(!rpl_filter->db_ok(lex->name) ||
	 !rpl_filter->db_ok_with_wild_table(lex->name)))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3785
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3786
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
3787
      break;
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3788
    }
3789
#endif
3790
    if (check_access(thd,DROP_ACL,lex->name,0,1,0,is_schema_db(lex->name)))
3791
      break;
3792 3793
    if (thd->locked_tables || thd->active_transaction())
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3794 3795
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3796 3797
      goto error;
    }
3798
    res= mysql_rm_db(thd, lex->name, lex->drop_if_exists, 0);
3799 3800
    break;
  }
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 3815 3816 3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842
  case SQLCOM_RENAME_DB:
  {
    LEX_STRING *olddb, *newdb;
    List_iterator <LEX_STRING> db_list(lex->db_list);
    olddb= db_list++;
    newdb= db_list++;
    if (end_active_trans(thd))
    {
      res= 1;
      break;
    }
#ifdef HAVE_REPLICATION
    if (thd->slave_thread && 
       (!rpl_filter->db_ok(olddb->str) ||
        !rpl_filter->db_ok(newdb->str) ||
        !rpl_filter->db_ok_with_wild_table(olddb->str) ||
        !rpl_filter->db_ok_with_wild_table(newdb->str)))
    {
      res= 1;
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
      break;
    }
#endif
    if (check_access(thd,ALTER_ACL,olddb->str,0,1,0,is_schema_db(olddb->str)) ||
        check_access(thd,DROP_ACL,olddb->str,0,1,0,is_schema_db(olddb->str)) ||
        check_access(thd,CREATE_ACL,newdb->str,0,1,0,is_schema_db(newdb->str)))
    {
      res= 1;
      break;
    }
    if (thd->locked_tables || thd->active_transaction())
    {
      res= 1;
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
      goto error;
    }
    res= mysql_rename_db(thd, olddb, newdb);
    if (!res)
      send_ok(thd);
    break;
  }
3843 3844
  case SQLCOM_ALTER_DB:
  {
3845 3846
    char *db= lex->name;
    DBUG_ASSERT(db); /* Must be set in the parser */
3847
    if (!strip_sp(db) || check_db_name(db))
3848
    {
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3849
      my_error(ER_WRONG_DB_NAME, MYF(0), db);
3850 3851
      break;
    }
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3852 3853 3854
    /*
      If in a slave thread :
      ALTER DATABASE DB may not be preceded by USE DB.
3855
      For that reason, maybe db_ok() in sql/slave.cc did not check the
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3856 3857 3858 3859
      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
3860
    if (thd->slave_thread &&
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3861 3862
	(!rpl_filter->db_ok(db) ||
	 !rpl_filter->db_ok_with_wild_table(db)))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3863
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3864
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3865 3866 3867
      break;
    }
#endif
3868
    if (check_access(thd, ALTER_ACL, db, 0, 1, 0, is_schema_db(db)))
3869 3870 3871
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3872 3873
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3874 3875
      goto error;
    }
3876
    res= mysql_alter_db(thd, db, &lex->create_info);
3877 3878
    break;
  }
3879 3880 3881 3882
  case SQLCOM_SHOW_CREATE_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
3883
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
3884 3885
      break;
    }
3886
    res=mysqld_show_create_db(thd,lex->name,&lex->create_info);
3887 3888
    break;
  }
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3889 3890 3891
  case SQLCOM_CREATE_EVENT:
  case SQLCOM_ALTER_EVENT:
  {
3892 3893 3894
    DBUG_ASSERT(lex->event_parse_data);
    switch (lex->sql_command) {
    case SQLCOM_CREATE_EVENT:
3895 3896
      res= Events::get_instance()->
            create_event(thd, lex->event_parse_data,
3897
                         lex->create_info.options & HA_LEX_CREATE_IF_NOT_EXISTS);
3898 3899
      break;
    case SQLCOM_ALTER_EVENT:
3900 3901
      res= Events::get_instance()->update_event(thd, lex->event_parse_data,
                                                lex->spname);
3902
      break;
3903 3904
    default:
      DBUG_ASSERT(0);
3905
    }
3906
    DBUG_PRINT("info",("DDL error code=%d", res));
3907
    if (!res)
3908
      send_ok(thd);
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3909

3910
    /* Don't do it, if we are inside a SP */
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3911 3912
    if (!thd->spcont)
    {
3913 3914
      delete lex->sphead;
      lex->sphead= NULL;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3915
    }
3916 3917

    /* lex->unit.cleanup() is called outside, no need to call it here */
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3918 3919
    break;
  }
3920
  case SQLCOM_DROP_EVENT:
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3921 3922 3923 3924 3925 3926
  case SQLCOM_SHOW_CREATE_EVENT:
  {
    DBUG_ASSERT(lex->spname);
    if (! lex->spname->m_db.str)
    {
      my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
3927
      goto error;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3928 3929 3930 3931 3932 3933 3934 3935
    }
    if (check_access(thd, EVENT_ACL, lex->spname->m_db.str, 0, 0, 0,
                     is_schema_db(lex->spname->m_db.str)))
      break;

    if (lex->spname->m_name.length > NAME_LEN)
    {
      my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str);
3936
      /* this jumps to the end of the function and skips own messaging */
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3937 3938
      goto error;
    }
3939 3940

    if (lex->sql_command == SQLCOM_SHOW_CREATE_EVENT)
3941 3942
      res= Events::get_instance()->show_create_event(thd, lex->spname->m_db,
                                                     lex->spname->m_name);
3943 3944
    else
    {
3945
      uint affected= 1;
3946 3947 3948 3949 3950
      if (!(res= Events::get_instance()->drop_event(thd,
                                                    lex->spname->m_db,
                                                    lex->spname->m_name,
                                                    lex->drop_if_exists,
                                                    FALSE)))
3951
        send_ok(thd);
3952
    }
3953 3954
    break;
  }
monty@mysql.com's avatar
monty@mysql.com committed
3955
  case SQLCOM_CREATE_FUNCTION:                  // UDF function
monty@mysql.com's avatar
monty@mysql.com committed
3956
  {
3957
    if (check_access(thd,INSERT_ACL,"mysql",0,1,0,0))
monty@mysql.com's avatar
monty@mysql.com committed
3958
      break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3959
#ifdef HAVE_DLOPEN
3960 3961
    if (sp_find_routine(thd, TYPE_ENUM_FUNCTION, lex->spname,
                        &thd->sp_func_cache, FALSE))
monty@mysql.com's avatar
monty@mysql.com committed
3962
    {
3963
      my_error(ER_UDF_EXISTS, MYF(0), lex->spname->m_name.str);
monty@mysql.com's avatar
monty@mysql.com committed
3964 3965
      goto error;
    }
3966
    if (!(res = mysql_create_function(thd, &lex->udf)))
monty@mysql.com's avatar
monty@mysql.com committed
3967
      send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3968
#else
hf@deer.(none)'s avatar
hf@deer.(none) committed
3969
    my_error(ER_CANT_OPEN_LIBRARY, MYF(0), lex->udf.dl, 0, "feature disabled");
3970
    res= TRUE;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3971 3972
#endif
    break;
monty@mysql.com's avatar
monty@mysql.com committed
3973
  }
hf@deer.(none)'s avatar
hf@deer.(none) committed
3974
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3975 3976
  case SQLCOM_CREATE_USER:
  {
3977
    if (check_access(thd, INSERT_ACL, "mysql", 0, 1, 1, 0) &&
3978
        check_global_access(thd,CREATE_USER_ACL))
3979
      break;
3980 3981
    if (end_active_trans(thd))
      goto error;
3982 3983 3984
    if (!(res= mysql_create_user(thd, lex->users_list)))
    {
      if (mysql_bin_log.is_open())
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3985 3986
        thd->binlog_query(THD::MYSQL_QUERY_TYPE,
                          thd->query, thd->query_length, FALSE, FALSE);
3987 3988 3989 3990
      send_ok(thd);
    }
    break;
  }
3991 3992
  case SQLCOM_DROP_USER:
  {
3993
    if (check_access(thd, DELETE_ACL, "mysql", 0, 1, 1, 0) &&
3994
        check_global_access(thd,CREATE_USER_ACL))
3995
      break;
3996 3997
    if (end_active_trans(thd))
      goto error;
3998 3999 4000 4001
    if (!(res= mysql_drop_user(thd, lex->users_list)))
    {
      if (mysql_bin_log.is_open())
      {
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
4002 4003
        thd->binlog_query(THD::MYSQL_QUERY_TYPE,
                          thd->query, thd->query_length, FALSE, FALSE);
4004 4005 4006 4007 4008 4009 4010
      }
      send_ok(thd);
    }
    break;
  }
  case SQLCOM_RENAME_USER:
  {
4011
    if (check_access(thd, UPDATE_ACL, "mysql", 0, 1, 1, 0) &&
4012
        check_global_access(thd,CREATE_USER_ACL))
4013
      break;
4014 4015
    if (end_active_trans(thd))
      goto error;
4016 4017 4018 4019
    if (!(res= mysql_rename_user(thd, lex->users_list)))
    {
      if (mysql_bin_log.is_open())
      {
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
4020 4021
        thd->binlog_query(THD::MYSQL_QUERY_TYPE,
                          thd->query, thd->query_length, FALSE, FALSE);
4022 4023 4024 4025 4026 4027 4028
      }
      send_ok(thd);
    }
    break;
  }
  case SQLCOM_REVOKE_ALL:
  {
4029
    if (check_access(thd, UPDATE_ACL, "mysql", 0, 1, 1, 0) &&
4030
        check_global_access(thd,CREATE_USER_ACL))
4031 4032 4033 4034 4035
      break;
    if (!(res = mysql_revoke_all(thd, lex->users_list)))
    {
      if (mysql_bin_log.is_open())
      {
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
4036 4037
        thd->binlog_query(THD::MYSQL_QUERY_TYPE,
                          thd->query, thd->query_length, FALSE, FALSE);
4038 4039 4040 4041 4042
      }
      send_ok(thd);
    }
    break;
  }
4043 4044 4045 4046
  case SQLCOM_REVOKE:
  case SQLCOM_GRANT:
  {
    if (check_access(thd, lex->grant | lex->grant_tot_col | GRANT_ACL,
serg@serg.mylan's avatar
serg@serg.mylan committed
4047
		     first_table ?  first_table->db : select_lex->db,
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4048
		     first_table ? &first_table->grant.privilege : 0,
4049 4050 4051
		     first_table ? 0 : 1, 0,
                     first_table ? (bool) first_table->schema_table :
                     select_lex->db ? is_schema_db(select_lex->db) : 0))
4052 4053
      goto error;

4054
    if (thd->security_ctx->user)              // If not replication
4055
    {
4056
      LEX_USER *user, *tmp_user;
4057

4058
      List_iterator <LEX_USER> user_list(lex->users_list);
4059
      while ((tmp_user= user_list++))
4060
      {
4061 4062
        if (!(user= get_current_user(thd, tmp_user)))
          goto error;
4063 4064 4065 4066 4067 4068 4069 4070
        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);
4071
        if (strcmp(thd->security_ctx->user, user->user.str) ||
4072
            my_strcasecmp(system_charset_info,
4073
                          user->host.str, thd->security_ctx->host_or_ip))
4074 4075
        {
          // TODO: use check_change_password()
4076 4077
          if (is_acl_user(user->host.str, user->user.str) &&
              user->password.str &&
4078
              check_access(thd, UPDATE_ACL,"mysql",0,1,1,0))
4079 4080 4081 4082 4083 4084
          {
            my_message(ER_PASSWORD_NOT_ALLOWED,
                       ER(ER_PASSWORD_NOT_ALLOWED), MYF(0));
            goto error;
          }
        }
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
4085 4086
      }
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4087
    if (first_table)
4088
    {
4089 4090
      if (lex->type == TYPE_ENUM_PROCEDURE ||
          lex->type == TYPE_ENUM_FUNCTION)
4091 4092 4093 4094 4095
      {
        uint grants= lex->all_privileges 
		   ? (PROC_ACLS & ~GRANT_ACL) | (lex->grant & GRANT_ACL)
		   : lex->grant;
        if (grant_option && 
4096 4097
	    check_grant_routine(thd, grants | GRANT_ACL, all_tables,
                                lex->type == TYPE_ENUM_PROCEDURE, 0))
4098
	  goto error;
4099 4100 4101 4102
        res= mysql_routine_grant(thd, all_tables,
                                 lex->type == TYPE_ENUM_PROCEDURE, 
                                 lex->users_list, grants,
                                 lex->sql_command == SQLCOM_REVOKE, 0);
4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115
      }
      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())
4116
      {
pem@mysql.com's avatar
pem@mysql.com committed
4117
        thd->clear_error();
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
4118 4119
        thd->binlog_query(THD::MYSQL_QUERY_TYPE,
                          thd->query, thd->query_length, FALSE, FALSE);
4120 4121 4122 4123
      }
    }
    else
    {
4124
      if (lex->columns.elements || lex->type)
4125
      {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4126 4127
	my_message(ER_ILLEGAL_GRANT_FOR_TABLE, ER(ER_ILLEGAL_GRANT_FOR_TABLE),
                   MYF(0));
4128
        goto error;
4129 4130 4131 4132 4133 4134 4135 4136
      }
      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())
	{
guilhem@mysql.com's avatar
guilhem@mysql.com committed
4137
          thd->clear_error();
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
4138 4139
          thd->binlog_query(THD::MYSQL_QUERY_TYPE,
                            thd->query, thd->query_length, FALSE, FALSE);
4140
	}
4141
	if (lex->sql_command == SQLCOM_GRANT)
4142
	{
4143
	  List_iterator <LEX_USER> str_list(lex->users_list);
4144 4145 4146 4147 4148
	  LEX_USER *user, *tmp_user;
	  while ((tmp_user=str_list++))
          {
            if (!(user= get_current_user(thd, tmp_user)))
              goto error;
monty@mysql.com's avatar
monty@mysql.com committed
4149
	    reset_mqh(user);
4150
          }
4151
	}
4152 4153 4154 4155
      }
    }
    break;
  }
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
4156
#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/
monty@donna.mysql.com's avatar
monty@donna.mysql.com committed
4157
  case SQLCOM_RESET:
4158 4159 4160
    /*
      RESET commands are never written to the binary log, so we have to
      initialize this variable because RESET shares the same code as FLUSH
4161 4162 4163 4164
    */
    lex->no_write_to_binlog= 1;
  case SQLCOM_FLUSH:
  {
4165
    bool write_to_binlog;
4166
    if (check_global_access(thd,RELOAD_ACL))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4167
      goto error;
4168 4169 4170 4171
    /*
      reload_acl_and_cache() will tell us if we are allowed to write to the
      binlog or not.
    */
4172
    if (!reload_acl_and_cache(thd, lex->type, first_table, &write_to_binlog))
4173 4174 4175 4176 4177 4178 4179 4180 4181
    {
      /*
        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())
        {
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
4182 4183
          thd->binlog_query(THD::STMT_QUERY_TYPE,
                            thd->query, thd->query_length, 0, FALSE);
4184 4185 4186 4187
        }
      }
      send_ok(thd);
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4188
    break;
4189
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4190
  case SQLCOM_KILL:
4191 4192 4193
  {
    Item *it= (Item *)lex->value_list.head();

4194
    if ((!it->fixed && it->fix_fields(lex->thd, &it)) || it->check_cols(1))
4195 4196 4197 4198 4199
    {
      my_message(ER_SET_CONSTANTS_ONLY, ER(ER_SET_CONSTANTS_ONLY),
		 MYF(0));
      goto error;
    }
4200
    sql_kill(thd, (ulong)it->val_int(), lex->type & ONLY_KILL_QUERY);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4201
    break;
4202
  }
hf@deer.(none)'s avatar
hf@deer.(none) committed
4203
#ifndef NO_EMBEDDED_ACCESS_CHECKS
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4204
  case SQLCOM_SHOW_GRANTS:
4205 4206 4207 4208
  {
    LEX_USER *grant_user= get_current_user(thd, lex->grant_user);
    if (!grant_user)
      goto error;
4209
    if ((thd->security_ctx->priv_user &&
4210
	 !strcmp(thd->security_ctx->priv_user, grant_user->user.str)) ||
4211
	!check_access(thd, SELECT_ACL, "mysql",0,1,0,0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4212
    {
4213
      res = mysql_show_grants(thd, grant_user);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4214 4215
    }
    break;
4216
  }
hf@deer.(none)'s avatar
hf@deer.(none) committed
4217
#endif
4218
  case SQLCOM_HA_OPEN:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4219
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
4220
    if (check_table_access(thd, SELECT_ACL, all_tables, 0))
4221
      goto error;
monty@mysql.com's avatar
monty@mysql.com committed
4222
    res= mysql_ha_open(thd, first_table, 0);
4223 4224
    break;
  case SQLCOM_HA_CLOSE:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4225 4226
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    res= mysql_ha_close(thd, first_table);
4227 4228
    break;
  case SQLCOM_HA_READ:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4229
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
4230 4231 4232 4233 4234
    /*
      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.
    */
4235
    unit->set_limit(select_lex);
4236
    res= mysql_ha_read(thd, first_table, lex->ha_read_mode, lex->ident.str,
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4237
                       lex->insert_list, lex->ha_rkey_mode, select_lex->where,
4238
                       unit->select_limit_cnt, unit->offset_limit_cnt);
4239 4240
    break;

bk@work.mysql.com's avatar
bk@work.mysql.com committed
4241
  case SQLCOM_BEGIN:
4242 4243 4244 4245 4246 4247
    if (thd->transaction.xid_state.xa_state != XA_NOTR)
    {
      my_error(ER_XAER_RMFAIL, MYF(0),
               xa_state_names[thd->transaction.xid_state.xa_state]);
      break;
    }
4248
    if (begin_trans(thd))
4249
      goto error;
serg@serg.mylan's avatar
serg@serg.mylan committed
4250
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4251 4252
    break;
  case SQLCOM_COMMIT:
4253
    if (end_trans(thd, lex->tx_release ? COMMIT_RELEASE :
serg@serg.mylan's avatar
serg@serg.mylan committed
4254
                              lex->tx_chain ? COMMIT_AND_CHAIN : COMMIT))
4255
      goto error;
4256
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4257 4258
    break;
  case SQLCOM_ROLLBACK:
4259
    if (end_trans(thd, lex->tx_release ? ROLLBACK_RELEASE :
serg@serg.mylan's avatar
serg@serg.mylan committed
4260
                              lex->tx_chain ? ROLLBACK_AND_CHAIN : ROLLBACK))
4261
      goto error;
4262
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4263
    break;
serg@serg.mylan's avatar
serg@serg.mylan committed
4264
  case SQLCOM_RELEASE_SAVEPOINT:
serg@serg.mylan's avatar
serg@serg.mylan committed
4265
  {
4266 4267
    SAVEPOINT *sv;
    for (sv=thd->transaction.savepoints; sv; sv=sv->prev)
serg@serg.mylan's avatar
serg@serg.mylan committed
4268 4269 4270
    {
      if (my_strnncoll(system_charset_info,
                       (uchar *)lex->ident.str, lex->ident.length,
4271
                       (uchar *)sv->name, sv->length) == 0)
serg@serg.mylan's avatar
serg@serg.mylan committed
4272 4273
        break;
    }
4274
    if (sv)
serg@serg.mylan's avatar
serg@serg.mylan committed
4275
    {
4276
      if (ha_release_savepoint(thd, sv))
serg@serg.mylan's avatar
serg@serg.mylan committed
4277
        res= TRUE; // cannot happen
serg@serg.mylan's avatar
serg@serg.mylan committed
4278 4279
      else
        send_ok(thd);
4280
      thd->transaction.savepoints=sv->prev;
serg@serg.mylan's avatar
serg@serg.mylan committed
4281
    }
4282
    else
serg@serg.mylan's avatar
serg@serg.mylan committed
4283
      my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4284
    break;
serg@serg.mylan's avatar
serg@serg.mylan committed
4285
  }
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
4286
  case SQLCOM_ROLLBACK_TO_SAVEPOINT:
serg@serg.mylan's avatar
serg@serg.mylan committed
4287
  {
4288 4289
    SAVEPOINT *sv;
    for (sv=thd->transaction.savepoints; sv; sv=sv->prev)
4290 4291 4292
    {
      if (my_strnncoll(system_charset_info,
                       (uchar *)lex->ident.str, lex->ident.length,
4293
                       (uchar *)sv->name, sv->length) == 0)
4294 4295
        break;
    }
4296
    if (sv)
4297
    {
4298
      if (ha_rollback_to_savepoint(thd, sv))
4299 4300
        res= TRUE; // cannot happen
      else
serg@serg.mylan's avatar
serg@serg.mylan committed
4301
      {
4302 4303
        if ((thd->options &
             (OPTION_STATUS_NO_TRANS_UPDATE | OPTION_KEEP_LOG)) &&
serg@serg.mylan's avatar
serg@serg.mylan committed
4304 4305 4306 4307 4308 4309
            !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);
      }
4310
      thd->transaction.savepoints=sv;
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
4311 4312
    }
    else
4313
      my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
4314
    break;
4315
  }
4316
  case SQLCOM_SAVEPOINT:
4317 4318
    if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN) ||
          thd->in_sub_stmt) || !opt_using_transactions)
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
4319
      send_ok(thd);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
4320
    else
4321 4322 4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358
    {
      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);
      }
    }
4359
    break;
4360 4361
  case SQLCOM_CREATE_PROCEDURE:
  case SQLCOM_CREATE_SPFUNCTION:
monty@mysql.com's avatar
monty@mysql.com committed
4362
  {
4363
    uint namelen;
4364
    char *name;
4365
    int result;
4366

4367
    DBUG_ASSERT(lex->sphead != 0);
4368
    DBUG_ASSERT(lex->sphead->m_db.str); /* Must be initialized in the parser */
4369

4370 4371
    if (check_access(thd, CREATE_PROC_ACL, lex->sphead->m_db.str, 0, 0, 0,
                     is_schema_db(lex->sphead->m_db.str)))
4372 4373 4374 4375 4376 4377
    {
      delete lex->sphead;
      lex->sphead= 0;
      goto error;
    }

4378
    if (end_active_trans(thd)) 
4379
    {
4380 4381 4382
      delete lex->sphead;
      lex->sphead= 0;
      goto error;
4383
    }
4384 4385

    name= lex->sphead->name(&namelen);
4386
#ifdef HAVE_DLOPEN
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monty@mysql.com committed
4387 4388 4389
    if (lex->sphead->m_type == TYPE_ENUM_FUNCTION)
    {
      udf_func *udf = find_udf(name, namelen);
4390

monty@mysql.com's avatar
monty@mysql.com committed
4391
      if (udf)
4392
      {
4393
	my_error(ER_UDF_EXISTS, MYF(0), name);
4394
	delete lex->sphead;
4395
	lex->sphead= 0;
4396
	goto error;
4397
      }
monty@mysql.com's avatar
monty@mysql.com committed
4398 4399 4400
    }
#endif

4401 4402 4403 4404 4405 4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423 4424 4425 4426 4427 4428 4429 4430 4431 4432 4433 4434 4435 4436 4437 4438 4439 4440 4441 4442 4443 4444 4445 4446 4447 4448 4449 4450 4451 4452 4453 4454 4455 4456 4457 4458 4459 4460 4461 4462 4463 4464 4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483 4484
    /*
      If the definer is not specified, this means that CREATE-statement missed
      DEFINER-clause. DEFINER-clause can be missed in two cases:
      
        - The user submitted a statement w/o the clause. This is a normal
          case, we should assign CURRENT_USER as definer.

        - Our slave received an updated from the master, that does not
          replicate definer for stored rountines. We should also assign
          CURRENT_USER as definer here, but also we should mark this routine
          as NON-SUID. This is essential for the sake of backward
          compatibility.
          
          The problem is the slave thread is running under "special" user (@),
          that actually does not exist. In the older versions we do not fail
          execution of a stored routine if its definer does not exist and
          continue the execution under the authorization of the invoker
          (BUG#13198). And now if we try to switch to slave-current-user (@),
          we will fail.

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

    if (!lex->definer)
    {
      bool res= FALSE;
      Query_arena original_arena;
      Query_arena *ps_arena = thd->activate_stmt_arena_if_needed(&original_arena);

      if (!(lex->definer= create_default_definer(thd)))
        res= TRUE;

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

      if (res)
      {
        /* Error has been already reported. */
        delete lex->sphead;
        lex->sphead= 0;
        goto error;
      }

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

    /*
      If the specified definer differs from the current user, we should check
      that the current user has SUPER privilege (in order to create a stored
      routine under another user one must have SUPER privilege).
    */
    
    else if (strcmp(lex->definer->user.str, thd->security_ctx->priv_user) ||
        my_strcasecmp(system_charset_info,
                      lex->definer->host.str,
                      thd->security_ctx->priv_host))
    {
      if (check_global_access(thd, SUPER_ACL))
      {
        my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), "SUPER");
        delete lex->sphead;
        lex->sphead= 0;
        goto error;
      }
    }

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

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

4485
    res= (result= lex->sphead->create(thd));
4486 4487
    if (result == SP_OK)
    {
4488
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4489
      /* only add privileges if really neccessary */
4490
      if (sp_automatic_privileges && !opt_noacl &&
4491
          check_routine_access(thd, DEFAULT_CREATE_PROC_ACLS,
4492
      			       lex->sphead->m_db.str, name,
4493
                               lex->sql_command == SQLCOM_CREATE_PROCEDURE, 1))
4494
      {
4495
        if (sp_grant_privileges(thd, lex->sphead->m_db.str, name,
4496
                                lex->sql_command == SQLCOM_CREATE_PROCEDURE))
4497 4498 4499
          push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 
	  	       ER_PROC_AUTO_GRANT_FAIL,
		       ER(ER_PROC_AUTO_GRANT_FAIL));
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4500
        close_thread_tables(thd);
4501
      }
4502
#endif
4503 4504 4505
      lex->unit.cleanup();
      delete lex->sphead;
      lex->sphead= 0;
4506
      send_ok(thd);
4507 4508 4509 4510 4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521 4522 4523 4524 4525 4526
    }
    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;
      }
4527
      lex->unit.cleanup();
monty@mysql.com's avatar
monty@mysql.com committed
4528 4529 4530
      delete lex->sphead;
      lex->sphead= 0;
      goto error;
4531
    }
monty@mysql.com's avatar
monty@mysql.com committed
4532 4533
    break;
  }
4534 4535 4536 4537
  case SQLCOM_CALL:
    {
      sp_head *sp;

4538 4539 4540 4541 4542 4543 4544 4545 4546
      /*
        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;

      /*
4547 4548
        By this moment all needed SPs should be in cache so no need to look 
        into DB. 
4549
      */
4550 4551
      if (!(sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname,
                                &thd->sp_proc_cache, TRUE)))
4552
      {
4553
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "PROCEDURE",
4554
                 lex->spname->m_qname.str);
4555
	goto error;
4556 4557 4558
      }
      else
      {
pem@mysql.comhem.se's avatar
pem@mysql.comhem.se committed
4559
	ha_rows select_limit;
monty@mysql.com's avatar
monty@mysql.com committed
4560 4561
        /* bits that should be cleared in thd->server_status */
	uint bits_to_be_cleared= 0;
4562 4563 4564 4565 4566 4567 4568 4569 4570 4571 4572 4573
        /*
          Check that the stored procedure doesn't contain Dynamic SQL
          and doesn't return result sets: such stored procedures can't
          be called from a function or trigger.
        */
        if (thd->in_sub_stmt)
        {
          const char *where= (thd->in_sub_stmt & SUB_STMT_TRIGGER ?
                              "trigger" : "function");
          if (sp->is_not_allowed_in_function(where))
            goto error;
        }
4574

4575 4576
	my_bool nsok= thd->net.no_send_ok;
	thd->net.no_send_ok= TRUE;
4577
	if (sp->m_flags & sp_head::MULTI_RESULTS)
4578
	{
4579
	  if (! (thd->client_capabilities & CLIENT_MULTI_RESULTS))
4580
	  {
4581 4582 4583 4584
            /*
              The client does not support multiple result sets being sent
              back
            */
4585
	    my_error(ER_SP_BADSELECT, MYF(0), sp->m_qname.str);
4586 4587 4588
	    thd->net.no_send_ok= nsok;
	    goto error;
	  }
monty@mysql.com's avatar
monty@mysql.com committed
4589 4590 4591 4592 4593 4594 4595
          /*
            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;
4596 4597
	}

4598
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4599
	if (check_routine_access(thd, EXECUTE_ACL,
4600
				 sp->m_db.str, sp->m_name.str, TRUE, FALSE))
4601 4602 4603 4604
	{
	  thd->net.no_send_ok= nsok;
	  goto error;
	}
4605
#endif
pem@mysql.comhem.se's avatar
pem@mysql.comhem.se committed
4606 4607
	select_limit= thd->variables.select_limit;
	thd->variables.select_limit= HA_POS_ERROR;
4608

4609
        thd->row_count_func= 0;
4610 4611
        
        /* 
4612
          We never write CALL statements into binlog:
4613 4614 4615 4616 4617
           - If the mode is non-prelocked, each statement will be logged
             separately.
           - If the mode is prelocked, the invoking statement will care
             about writing into binlog.
          So just execute the statement.
4618
        */
4619
	res= sp->execute_procedure(thd, &lex->value_list);
4620 4621 4622
	/*
          If warnings have been cleared, we have to clear total_warn_count
          too, otherwise the clients get confused.
4623 4624 4625 4626
	 */
	if (thd->warn_list.is_empty())
	  thd->total_warn_count= 0;

pem@mysql.comhem.se's avatar
pem@mysql.comhem.se committed
4627
	thd->variables.select_limit= select_limit;
4628

4629
	thd->net.no_send_ok= nsok;
monty@mysql.com's avatar
monty@mysql.com committed
4630
        thd->server_status&= ~bits_to_be_cleared;
4631

4632
	if (!res)
monty@mysql.com's avatar
monty@mysql.com committed
4633 4634
	  send_ok(thd, (ulong) (thd->row_count_func < 0 ? 0 :
                                thd->row_count_func));
4635 4636
	else
	  goto error;		// Substatement should already have sent error
4637
      }
4638
      break;
4639 4640
    }
  case SQLCOM_ALTER_PROCEDURE:
4641
  case SQLCOM_ALTER_FUNCTION:
4642
    {
4643
      int result;
4644 4645 4646 4647
      sp_head *sp;
      st_sp_chistics chistics;

      memcpy(&chistics, &lex->sp_chistics, sizeof(chistics));
4648
      if (lex->sql_command == SQLCOM_ALTER_PROCEDURE)
4649 4650
        sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname,
                            &thd->sp_proc_cache, FALSE);
4651
      else
4652 4653
        sp= sp_find_routine(thd, TYPE_ENUM_FUNCTION, lex->spname,
                            &thd->sp_func_cache, FALSE);
monty@mysql.com's avatar
monty@mysql.com committed
4654
      mysql_reset_errors(thd, 0);
4655
      if (! sp)
4656 4657 4658 4659 4660 4661 4662 4663 4664
      {
	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;
	}
      }
4665 4666
      else
      {
4667 4668 4669
        if (check_routine_access(thd, ALTER_PROC_ACL, sp->m_db.str, 
				 sp->m_name.str,
                                 lex->sql_command == SQLCOM_ALTER_PROCEDURE, 0))
4670
	  goto error;
4671 4672 4673

        if (end_active_trans(thd)) 
          goto error;
4674
	memcpy(&lex->sp_chistics, &chistics, sizeof(lex->sp_chistics));
4675 4676
        if ((sp->m_type == TYPE_ENUM_FUNCTION) &&
            !trust_function_creators &&  mysql_bin_log.is_open() &&
4677 4678 4679 4680 4681 4682 4683 4684 4685 4686
            !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
        {
4687 4688 4689 4690 4691 4692
          /*
            Note that if you implement the capability of ALTER FUNCTION to
            alter the body of the function, this command should be made to
            follow the restrictions that log-bin-trust-function-creators=0
            already puts on CREATE FUNCTION.
          */
4693 4694 4695 4696 4697
          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);
        }
4698
      }
4699
      switch (result)
4700
      {
4701
      case SP_OK:
4702 4703 4704
        if (mysql_bin_log.is_open())
        {
          thd->clear_error();
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
4705 4706
          thd->binlog_query(THD::MYSQL_QUERY_TYPE,
                            thd->query, thd->query_length, FALSE, FALSE);
4707
        }
4708
	send_ok(thd);
4709 4710
	break;
      case SP_KEY_NOT_FOUND:
4711 4712
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4713 4714
	goto error;
      default:
4715 4716
	my_error(ER_SP_CANT_ALTER, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4717
	goto error;
4718
      }
4719
      break;
4720 4721
    }
  case SQLCOM_DROP_PROCEDURE:
4722
  case SQLCOM_DROP_FUNCTION:
4723
    {
4724
      int result;
4725 4726
      int type= (lex->sql_command == SQLCOM_DROP_PROCEDURE ?
                 TYPE_ENUM_PROCEDURE : TYPE_ENUM_FUNCTION);
4727

4728
      result= sp_routine_exists_in_table(thd, type, lex->spname);
monty@mysql.com's avatar
monty@mysql.com committed
4729
      mysql_reset_errors(thd, 0);
4730
      if (result == SP_OK)
4731
      {
4732 4733 4734
        char *db= lex->spname->m_db.str;
	char *name= lex->spname->m_name.str;

4735 4736
	if (check_routine_access(thd, ALTER_PROC_ACL, db, name,
                                 lex->sql_command == SQLCOM_DROP_PROCEDURE, 0))
bell@sanja.is.com.ua's avatar
merge  
bell@sanja.is.com.ua committed
4737
          goto error;
4738 4739 4740

        if (end_active_trans(thd)) 
          goto error;
4741
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4742
	if (sp_automatic_privileges && !opt_noacl &&
4743 4744
	    sp_revoke_privileges(thd, db, name, 
                                 lex->sql_command == SQLCOM_DROP_PROCEDURE))
4745 4746 4747 4748 4749
	{
	  push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 
		       ER_PROC_AUTO_REVOKE_FAIL,
		       ER(ER_PROC_AUTO_REVOKE_FAIL));
	}
4750
#endif
4751
	if (lex->sql_command == SQLCOM_DROP_PROCEDURE)
bell@sanja.is.com.ua's avatar
merge  
bell@sanja.is.com.ua committed
4752
	  result= sp_drop_procedure(thd, lex->spname);
4753
	else
bell@sanja.is.com.ua's avatar
merge  
bell@sanja.is.com.ua committed
4754
	  result= sp_drop_function(thd, lex->spname);
4755 4756 4757
      }
      else
      {
4758
#ifdef HAVE_DLOPEN
4759 4760 4761 4762 4763 4764
	if (lex->sql_command == SQLCOM_DROP_FUNCTION)
	{
          udf_func *udf = find_udf(lex->spname->m_name.str,
                                   lex->spname->m_name.length);
          if (udf)
          {
4765
	    if (check_access(thd, DELETE_ACL, "mysql", 0, 1, 0, 0))
4766 4767
	      goto error;
	    if (!(res = mysql_drop_function(thd, &lex->spname->m_name)))
4768
	    {
4769 4770
	      send_ok(thd);
	      break;
4771 4772
	    }
	  }
4773
	}
4774
#endif
4775 4776 4777 4778 4779 4780 4781
	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;
	}
4782
      }
4783 4784
      res= result;
      switch (result)
4785 4786
      {
      case SP_OK:
4787 4788 4789
        if (mysql_bin_log.is_open())
        {
          thd->clear_error();
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
4790 4791
          thd->binlog_query(THD::MYSQL_QUERY_TYPE,
                            thd->query, thd->query_length, FALSE, FALSE);
4792
        }
4793
	send_ok(thd);
4794 4795
	break;
      case SP_KEY_NOT_FOUND:
4796 4797
	if (lex->drop_if_exists)
	{
4798
	  push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
4799
			      ER_SP_DOES_NOT_EXIST, ER(ER_SP_DOES_NOT_EXIST),
4800
			      SP_COM_STRING(lex), lex->spname->m_name.str);
4801
	  res= FALSE;
4802 4803 4804
	  send_ok(thd);
	  break;
	}
4805 4806
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4807 4808
	goto error;
      default:
4809 4810
	my_error(ER_SP_DROP_FAILED, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4811
	goto error;
4812
      }
4813
      break;
4814
    }
4815 4816
  case SQLCOM_SHOW_CREATE_PROC:
    {
4817
      if (lex->spname->m_name.length > NAME_LEN)
4818
      {
4819
	my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str);
4820 4821
	goto error;
      }
4822
      if (sp_show_create_procedure(thd, lex->spname) != SP_OK)
4823
      {			/* We don't distinguish between errors for now */
4824 4825
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
4826 4827 4828 4829 4830 4831
	goto error;
      }
      break;
    }
  case SQLCOM_SHOW_CREATE_FUNC:
    {
4832
      if (lex->spname->m_name.length > NAME_LEN)
4833
      {
4834
	my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str);
4835 4836
	goto error;
      }
4837
      if (sp_show_create_function(thd, lex->spname) != SP_OK)
4838
      {			/* We don't distinguish between errors for now */
4839 4840
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
4841 4842 4843 4844
	goto error;
      }
      break;
    }
4845
#ifdef NOT_USED
4846 4847
  case SQLCOM_SHOW_STATUS_PROC:
    {
4848
      res= sp_show_status_procedure(thd, (lex->wild ?
4849 4850 4851 4852 4853
					  lex->wild->ptr() : NullS));
      break;
    }
  case SQLCOM_SHOW_STATUS_FUNC:
    {
4854
      res= sp_show_status_function(thd, (lex->wild ? 
4855 4856 4857
					 lex->wild->ptr() : NullS));
      break;
    }
4858
#endif
pem@mysql.com's avatar
pem@mysql.com committed
4859 4860 4861 4862 4863 4864 4865 4866 4867 4868 4869 4870
#ifndef DBUG_OFF
  case SQLCOM_SHOW_PROC_CODE:
  case SQLCOM_SHOW_FUNC_CODE:
    {
      sp_head *sp;

      if (lex->spname->m_name.length > NAME_LEN)
      {
	my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str);
	goto error;
      }
      if (lex->sql_command == SQLCOM_SHOW_PROC_CODE)
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bell@sanja.is.com.ua committed
4871 4872
        sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname,
                            &thd->sp_proc_cache, FALSE);
pem@mysql.com's avatar
pem@mysql.com committed
4873
      else
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4874 4875
        sp= sp_find_routine(thd, TYPE_ENUM_FUNCTION, lex->spname,
                            &thd->sp_func_cache, FALSE);
4876
      if (!sp || sp->show_routine_code(thd))
4877 4878
      {
        /* We don't distinguish between errors for now */
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pem@mysql.com committed
4879 4880 4881 4882 4883 4884 4885
        my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
        goto error;
      }
      break;
    }
#endif // ifndef DBUG_OFF
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4886 4887
  case SQLCOM_CREATE_VIEW:
    {
4888 4889 4890
      if (end_active_trans(thd))
        goto error;

4891 4892 4893
      if (!(res= mysql_create_view(thd, thd->lex->create_view_mode)) &&
          mysql_bin_log.is_open())
      {
4894
        String buff;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4895
        const LEX_STRING command[3]=
andrey@example.com's avatar
andrey@example.com committed
4896 4897 4898
          {{ C_STRING_WITH_LEN("CREATE ") },
           { C_STRING_WITH_LEN("ALTER ") },
           { C_STRING_WITH_LEN("CREATE OR REPLACE ") }};
4899
        thd->clear_error();
4900 4901 4902 4903

        buff.append(command[thd->lex->create_view_mode].str,
                    command[thd->lex->create_view_mode].length);
        view_store_options(thd, first_table, &buff);
4904
        buff.append(STRING_WITH_LEN("VIEW "));
4905
        /* Test if user supplied a db (ie: we did not use thd->db) */
4906 4907
        if (first_table->db && first_table->db[0] &&
            (thd->db == NULL || strcmp(first_table->db, thd->db)))
4908 4909 4910 4911 4912 4913 4914
        {
          append_identifier(thd, &buff, first_table->db,
                            first_table->db_length);
          buff.append('.');
        }
        append_identifier(thd, &buff, first_table->table_name,
                          first_table->table_name_length);
4915 4916 4917 4918 4919 4920 4921 4922 4923 4924 4925 4926 4927
        if (lex->view_list.elements)
        {
          List_iterator_fast<LEX_STRING> names(lex->view_list);
          LEX_STRING *name;
          int i;
          
          for (i= 0; name= names++; i++)
          {
            buff.append(i ? ", " : "(");
            append_identifier(thd, &buff, name->str, name->length);
          }
          buff.append(')');
        }
4928
        buff.append(STRING_WITH_LEN(" AS "));
4929 4930
        buff.append(first_table->source.str, first_table->source.length);

cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
4931 4932
        thd->binlog_query(THD::STMT_QUERY_TYPE,
                          buff.ptr(), buff.length(), FALSE, FALSE);
4933
      }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4934 4935 4936 4937
      break;
    }
  case SQLCOM_DROP_VIEW:
    {
4938 4939 4940
      if (check_table_access(thd, DROP_ACL, all_tables, 0) ||
          end_active_trans(thd))
        goto error;
4941 4942 4943
      if (!(res= mysql_drop_view(thd, first_table, thd->lex->drop_mode)) &&
          mysql_bin_log.is_open())
      {
4944
        thd->clear_error();
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
4945 4946
        thd->binlog_query(THD::STMT_QUERY_TYPE,
                          thd->query, thd->query_length, FALSE, FALSE);
4947
      }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4948 4949
      break;
    }
4950 4951
  case SQLCOM_CREATE_TRIGGER:
  {
4952 4953 4954
    if (end_active_trans(thd))
      goto error;

4955 4956 4957
    res= mysql_create_or_drop_trigger(thd, all_tables, 1);

    /* We don't care about trigger body after this point */
4958 4959 4960 4961 4962 4963
    delete lex->sphead;
    lex->sphead= 0;
    break;
  }
  case SQLCOM_DROP_TRIGGER:
  {
4964 4965 4966
    if (end_active_trans(thd))
      goto error;

4967 4968 4969
    res= mysql_create_or_drop_trigger(thd, all_tables, 0);
    break;
  }
4970
  case SQLCOM_XA_START:
4971 4972
    if (thd->transaction.xid_state.xa_state == XA_IDLE &&
        thd->lex->xa_opt == XA_RESUME)
4973
    {
4974
      if (! thd->transaction.xid_state.xid.eq(thd->lex->xid))
4975 4976 4977 4978
      {
        my_error(ER_XAER_NOTA, MYF(0));
        break;
      }
4979
      thd->transaction.xid_state.xa_state=XA_ACTIVE;
4980 4981 4982
      send_ok(thd);
      break;
    }
serg@serg.mylan's avatar
serg@serg.mylan committed
4983
    if (thd->lex->xa_opt != XA_NONE)
4984 4985 4986 4987
    { // JOIN is not supported yet. TODO
      my_error(ER_XAER_INVAL, MYF(0));
      break;
    }
4988
    if (thd->transaction.xid_state.xa_state != XA_NOTR)
4989
    {
4990
      my_error(ER_XAER_RMFAIL, MYF(0),
4991
               xa_state_names[thd->transaction.xid_state.xa_state]);
4992 4993 4994 4995 4996 4997 4998
      break;
    }
    if (thd->active_transaction() || thd->locked_tables)
    {
      my_error(ER_XAER_OUTSIDE, MYF(0));
      break;
    }
4999 5000 5001 5002 5003 5004 5005 5006 5007
    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);
5008 5009
    thd->options= ((thd->options & ~(OPTION_STATUS_NO_TRANS_UPDATE |
                                     OPTION_KEEP_LOG)) |
5010 5011 5012 5013 5014 5015 5016 5017 5018 5019 5020
                   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;
    }
5021
    if (thd->transaction.xid_state.xa_state != XA_ACTIVE)
5022
    {
5023
      my_error(ER_XAER_RMFAIL, MYF(0),
5024
               xa_state_names[thd->transaction.xid_state.xa_state]);
5025 5026
      break;
    }
5027
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
5028 5029 5030 5031
    {
      my_error(ER_XAER_NOTA, MYF(0));
      break;
    }
5032
    thd->transaction.xid_state.xa_state=XA_IDLE;
5033 5034 5035
    send_ok(thd);
    break;
  case SQLCOM_XA_PREPARE:
5036
    if (thd->transaction.xid_state.xa_state != XA_IDLE)
5037
    {
5038
      my_error(ER_XAER_RMFAIL, MYF(0),
5039
               xa_state_names[thd->transaction.xid_state.xa_state]);
5040 5041
      break;
    }
5042
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
5043 5044 5045 5046 5047 5048 5049
    {
      my_error(ER_XAER_NOTA, MYF(0));
      break;
    }
    if (ha_prepare(thd))
    {
      my_error(ER_XA_RBROLLBACK, MYF(0));
5050 5051
      xid_cache_delete(&thd->transaction.xid_state);
      thd->transaction.xid_state.xa_state=XA_NOTR;
5052 5053
      break;
    }
5054
    thd->transaction.xid_state.xa_state=XA_PREPARED;
5055 5056 5057
    send_ok(thd);
    break;
  case SQLCOM_XA_COMMIT:
5058
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
5059
    {
5060 5061
      XID_STATE *xs=xid_cache_search(thd->lex->xid);
      if (!xs || xs->in_thd)
5062
        my_error(ER_XAER_NOTA, MYF(0));
serg@serg.mylan's avatar
serg@serg.mylan committed
5063
      else
5064 5065 5066
      {
        ha_commit_or_rollback_by_xid(thd->lex->xid, 1);
        xid_cache_delete(xs);
serg@serg.mylan's avatar
serg@serg.mylan committed
5067
        send_ok(thd);
5068
      }
5069 5070
      break;
    }
5071
    if (thd->transaction.xid_state.xa_state == XA_IDLE &&
monty@mysql.com's avatar
monty@mysql.com committed
5072
        thd->lex->xa_opt == XA_ONE_PHASE)
5073
    {
5074 5075 5076
      int r;
      if ((r= ha_commit(thd)))
        my_error(r == 1 ? ER_XA_RBROLLBACK : ER_XAER_RMERR, MYF(0));
5077 5078 5079
      else
        send_ok(thd);
    }
5080
    else if (thd->transaction.xid_state.xa_state == XA_PREPARED &&
monty@mysql.com's avatar
monty@mysql.com committed
5081
             thd->lex->xa_opt == XA_NONE)
5082
    {
5083 5084 5085
      if (wait_if_global_read_lock(thd, 0, 0))
      {
        ha_rollback(thd);
5086
        my_error(ER_XAER_RMERR, MYF(0));
5087
      }
5088
      else
5089 5090 5091 5092 5093 5094 5095
      {
        if (ha_commit_one_phase(thd, 1))
          my_error(ER_XAER_RMERR, MYF(0));
        else
          send_ok(thd);
        start_waiting_global_read_lock(thd);
      }
5096 5097 5098
    }
    else
    {
5099
      my_error(ER_XAER_RMFAIL, MYF(0),
5100
               xa_state_names[thd->transaction.xid_state.xa_state]);
5101 5102
      break;
    }
5103 5104
    thd->options&= ~(OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE |
                     OPTION_KEEP_LOG);
5105
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
5106 5107
    xid_cache_delete(&thd->transaction.xid_state);
    thd->transaction.xid_state.xa_state=XA_NOTR;
5108 5109
    break;
  case SQLCOM_XA_ROLLBACK:
5110
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
5111
    {
5112 5113
      XID_STATE *xs=xid_cache_search(thd->lex->xid);
      if (!xs || xs->in_thd)
5114
        my_error(ER_XAER_NOTA, MYF(0));
serg@serg.mylan's avatar
serg@serg.mylan committed
5115
      else
5116 5117 5118
      {
        ha_commit_or_rollback_by_xid(thd->lex->xid, 0);
        xid_cache_delete(xs);
serg@serg.mylan's avatar
serg@serg.mylan committed
5119
        send_ok(thd);
5120
      }
5121 5122
      break;
    }
5123 5124
    if (thd->transaction.xid_state.xa_state != XA_IDLE &&
        thd->transaction.xid_state.xa_state != XA_PREPARED)
5125
    {
5126
      my_error(ER_XAER_RMFAIL, MYF(0),
5127
               xa_state_names[thd->transaction.xid_state.xa_state]);
5128 5129 5130 5131 5132 5133
      break;
    }
    if (ha_rollback(thd))
      my_error(ER_XAER_RMERR, MYF(0));
    else
      send_ok(thd);
5134 5135
    thd->options&= ~(OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE |
                     OPTION_KEEP_LOG);
5136
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
5137 5138
    xid_cache_delete(&thd->transaction.xid_state);
    thd->transaction.xid_state.xa_state=XA_NOTR;
5139 5140
    break;
  case SQLCOM_XA_RECOVER:
5141
    res= mysql_xa_recover(thd);
5142
    break;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
5143 5144 5145 5146 5147 5148 5149 5150 5151 5152 5153 5154 5155 5156 5157 5158 5159 5160 5161 5162 5163 5164 5165 5166
  case SQLCOM_ALTER_TABLESPACE:
    if (check_access(thd, ALTER_ACL, thd->db, 0, 1, 0, thd->db ? is_schema_db(thd->db) : 0))
      break;
    if (!(res= mysql_alter_tablespace(thd, lex->alter_tablespace_info)))
      send_ok(thd);
    break;
  case SQLCOM_INSTALL_PLUGIN:
    if (! (res= mysql_install_plugin(thd, &thd->lex->comment,
                                     &thd->lex->ident)))
      send_ok(thd);
    break;
  case SQLCOM_UNINSTALL_PLUGIN:
    if (! (res= mysql_uninstall_plugin(thd, &thd->lex->comment)))
      send_ok(thd);
    break;
  case SQLCOM_BINLOG_BASE64_EVENT:
  {
#ifndef EMBEDDED_LIBRARY
    mysql_client_binlog_statement(thd);
#else /* EMBEDDED_LIBRARY */
    my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "embedded");
#endif /* EMBEDDED_LIBRARY */
    break;
  }
5167
  default:
5168
#ifndef EMBEDDED_LIBRARY
5169
    DBUG_ASSERT(0);                             /* Impossible */
5170
#endif
5171
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5172 5173
    break;
  }
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
5174 5175

end:
monty@mysql.com's avatar
monty@mysql.com committed
5176
  thd->proc_info="query end";
5177 5178

  /*
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
5179
    Binlog-related cleanup:
5180 5181 5182 5183 5184 5185 5186 5187 5188 5189 5190
    Reset system variables temporarily modified by SET ONE SHOT.

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

5191
  /*
5192 5193
    The return value for ROW_COUNT() is "implementation dependent" if the
    statement is not DELETE, INSERT or UPDATE, but -1 is what JDBC and ODBC
5194 5195 5196 5197
    wants. We also keep the last value in case of SQLCOM_CALL or
    SQLCOM_EXECUTE.
  */
  if (!(sql_command_flags[lex->sql_command] & CF_HAS_ROW_COUNT))
5198
    thd->row_count_func= -1;
5199

5200
  goto finish;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5201 5202

error:
5203 5204
  res= TRUE;

5205
finish:
5206 5207 5208 5209 5210 5211 5212 5213 5214
  if (need_start_waiting)
  {
    /*
      Release the protection against the global read lock and wake
      everyone, who might want to set a global read lock.
    */
    start_waiting_global_read_lock(thd);
  }
  DBUG_RETURN(res || thd->net.report_error);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5215 5216 5217
}


5218 5219 5220 5221 5222 5223 5224 5225 5226 5227 5228 5229 5230 5231 5232 5233 5234 5235 5236 5237 5238 5239 5240
static bool execute_sqlcom_select(THD *thd, TABLE_LIST *all_tables)
{
  LEX	*lex= thd->lex;
  select_result *result=lex->result;
  bool res;
  /* assign global limit variable if limit is not given */
  {
    SELECT_LEX *param= lex->unit.global_parameters;
    if (!param->explicit_limit)
      param->select_limit=
        new Item_int((ulonglong) thd->variables.select_limit);
  }
  if (!(res= open_and_lock_tables(thd, all_tables)))
  {
    if (lex->describe)
    {
      /*
        We always use select_send for EXPLAIN, even if it's an EXPLAIN
        for SELECT ... INTO OUTFILE: a user application should be able
        to prepend EXPLAIN to any query and receive output for it,
        even if the query itself redirects the output.
      */
      if (!(result= new select_send()))
5241
        return 1;                               /* purecov: inspected */
5242 5243 5244 5245 5246 5247 5248 5249 5250 5251 5252 5253 5254 5255 5256 5257 5258 5259
      thd->send_explain_fields(result);
      res= mysql_explain_union(thd, &thd->lex->unit, result);
      if (lex->describe & DESCRIBE_EXTENDED)
      {
        char buff[1024];
        String str(buff,(uint32) sizeof(buff), system_charset_info);
        str.length(0);
        thd->lex->unit.print(&str);
        str.append('\0');
        push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
                     ER_YES, str.ptr());
      }
      result->send_eof();
      delete result;
    }
    else
    {
      if (!result && !(result= new select_send()))
5260
        return 1;                               /* purecov: inspected */
5261 5262 5263 5264 5265 5266 5267 5268 5269 5270
      query_cache_store_query(thd, all_tables);
      res= handle_select(thd, lex, result, 0);
      if (result != lex->result)
        delete result;
    }
  }
  return res;
}


bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5271
/*
5272
  Check grants for commands which work only with one table.
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5273

5274
  SYNOPSIS
5275
    check_single_table_access()
monty@mysql.com's avatar
monty@mysql.com committed
5276
    thd			Thread handler
5277
    privilege		requested privilege
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
5278
    all_tables		global table list of query
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5279 5280 5281

  RETURN
    0 - OK
monty@mysql.com's avatar
monty@mysql.com committed
5282
    1 - access denied, error is sent to client
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5283 5284
*/

5285 5286
bool check_single_table_access(THD *thd, ulong privilege, 
                               TABLE_LIST *all_tables)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5287
{
5288 5289 5290 5291 5292 5293
  Security_context * backup_ctx= thd->security_ctx;

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

5294 5295 5296 5297 5298 5299 5300 5301
  const char *db_name;
  if ((all_tables->view || all_tables->field_translation) &&
      !all_tables->schema_table)
    db_name= all_tables->view_db.str;
  else
    db_name= all_tables->db;

  if (check_access(thd, privilege, db_name,
5302 5303
		   &all_tables->grant.privilege, 0, 0,
                   test(all_tables->schema_table)))
5304
    goto deny;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5305

5306
  /* Show only 1 table for check_grant */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
5307
  if (grant_option && check_grant(thd, privilege, all_tables, 0, 1, 0))
5308 5309 5310
    goto deny;

  thd->security_ctx= backup_ctx;
5311 5312 5313 5314 5315 5316 5317 5318 5319 5320 5321 5322 5323 5324 5325 5326 5327 5328 5329 5330 5331 5332 5333 5334 5335 5336
  return 0;

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

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

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

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

bool check_one_table_access(THD *thd, ulong privilege, TABLE_LIST *all_tables)
{
  if (check_single_table_access (thd,privilege,all_tables))
    return 1;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5337

5338
  /* Check rights on tables of subselects and implictly opened tables */
5339
  TABLE_LIST *subselects_tables, *view= all_tables->view ? all_tables : 0;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
5340
  if ((subselects_tables= all_tables->next_global))
monty@mysql.com's avatar
monty@mysql.com committed
5341
  {
5342 5343 5344 5345 5346 5347 5348 5349 5350 5351 5352 5353
    /*
      Access rights asked for the first table of a view should be the same
      as for the view
    */
    if (view && subselects_tables->belong_to_view == view)
    {
      if (check_single_table_access (thd, privilege, subselects_tables))
        return 1;
      subselects_tables= subselects_tables->next_global;
    }
    if (subselects_tables &&
        (check_table_access(thd, SELECT_ACL, subselects_tables, 0)))
5354
      return 1;
monty@mysql.com's avatar
monty@mysql.com committed
5355 5356
  }
  return 0;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5357 5358 5359
}


bk@work.mysql.com's avatar
bk@work.mysql.com committed
5360
/****************************************************************************
5361
  Get the user (global) and database privileges for all used tables
5362 5363 5364 5365 5366 5367 5368 5369 5370 5371 5372 5373 5374

  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
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
5375 5376
                is enough to satisfy the request and the global grants contains
                a SELECT grant.
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5377 5378 5379
****************************************************************************/

bool
5380
check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
5381
	     bool dont_check_global_grants, bool no_errors, bool schema_db)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5382
{
5383
  Security_context *sctx= thd->security_ctx;
5384 5385
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  ulong db_access;
5386
  bool  db_is_pattern= test(want_access & GRANT_ACL);
5387 5388
#endif
  ulong dummy;
5389 5390
  DBUG_ENTER("check_access");
  DBUG_PRINT("enter",("db: %s  want_access: %lu  master_access: %lu",
5391
                      db ? db : "", want_access, sctx->master_access));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5392 5393 5394 5395 5396
  if (save_priv)
    *save_priv=0;
  else
    save_priv= &dummy;

5397
  if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5398
  {
5399
    DBUG_PRINT("error",("No database"));
5400
    if (!no_errors)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5401 5402
      my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR),
                 MYF(0));                       /* purecov: tested */
5403
    DBUG_RETURN(TRUE);				/* purecov: tested */
bk@work.mysql.com's avatar
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5404 5405
  }

5406 5407 5408 5409 5410
  if (schema_db)
  {
    if (want_access & ~(SELECT_ACL | EXTRA_ACL))
    {
      if (!no_errors)
5411 5412
      {
        const char *db_name= db ? db : thd->db;
5413
        my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
5414 5415
                 sctx->priv_user, sctx->priv_host, db_name);
      }
5416 5417 5418 5419 5420 5421 5422 5423 5424
      DBUG_RETURN(TRUE);
    }
    else
    {
      *save_priv= SELECT_ACL;
      DBUG_RETURN(FALSE);
    }
  }

monty@mysql.com's avatar
monty@mysql.com committed
5425 5426 5427
#ifdef NO_EMBEDDED_ACCESS_CHECKS
  DBUG_RETURN(0);
#else
5428
  if ((sctx->master_access & want_access) == want_access)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5429
  {
5430 5431 5432 5433 5434
    /*
      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
    */
5435 5436
    db_access= sctx->db_access;
    if (!(sctx->master_access & SELECT_ACL) &&
5437
	(db && (!thd->db || db_is_pattern || strcmp(db,thd->db))))
5438 5439 5440
      db_access=acl_get(sctx->host, sctx->ip, sctx->priv_user, db,
                        db_is_pattern);
    *save_priv=sctx->master_access | db_access;
5441
    DBUG_RETURN(FALSE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5442
  }
5443
  if (((want_access & ~sctx->master_access) & ~(DB_ACLS | EXTRA_ACL)) ||
5444
      ! db && dont_check_global_grants)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5445
  {						// We can never grant this
5446
    DBUG_PRINT("error",("No possible access"));
5447
    if (!no_errors)
5448
      my_error(ER_ACCESS_DENIED_ERROR, MYF(0),
5449 5450
               sctx->priv_user,
               sctx->priv_host,
5451 5452 5453
               (thd->password ?
                ER(ER_YES) :
                ER(ER_NO)));                    /* purecov: tested */
5454
    DBUG_RETURN(TRUE);				/* purecov: tested */
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5455 5456 5457
  }

  if (db == any_db)
5458
    DBUG_RETURN(FALSE);				// Allow select on anything
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5459

5460
  if (db && (!thd->db || db_is_pattern || strcmp(db,thd->db)))
5461 5462
    db_access= acl_get(sctx->host, sctx->ip, sctx->priv_user, db,
                       db_is_pattern);
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bk@work.mysql.com committed
5463
  else
5464
    db_access= sctx->db_access;
5465
  DBUG_PRINT("info",("db_access: %lu", db_access));
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5466
  /* Remove SHOW attribute and access rights we already have */
5467
  want_access &= ~(sctx->master_access | EXTRA_ACL);
5468 5469
  DBUG_PRINT("info",("db_access: %lu  want_access: %lu",
                     db_access, want_access));
5470
  db_access= ((*save_priv=(db_access | sctx->master_access)) & want_access);
5471 5472

  /* grant_option is set if there exists a single table or column grant */
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5473
  if (db_access == want_access ||
5474
      (grant_option && !dont_check_global_grants &&
5475
       !(want_access & ~(db_access | TABLE_ACLS | PROC_ACLS))))
5476
    DBUG_RETURN(FALSE);				/* Ok */
5477 5478

  DBUG_PRINT("error",("Access denied"));
5479
  if (!no_errors)
5480
    my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
5481
             sctx->priv_user, sctx->priv_host,
5482 5483 5484
             (db ? db : (thd->db ?
                         thd->db :
                         "unknown")));          /* purecov: tested */
5485
  DBUG_RETURN(TRUE);				/* purecov: tested */
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monty@mysql.com committed
5486
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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5487 5488 5489
}


5490 5491 5492 5493 5494 5495 5496 5497 5498
/*
  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
5499
    One gets access right if one has ANY of the rights in want_access
5500 5501 5502 5503 5504 5505 5506 5507
    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
*/
5508 5509

bool check_global_access(THD *thd, ulong want_access)
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5510
{
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5511 5512 5513
#ifdef NO_EMBEDDED_ACCESS_CHECKS
  return 0;
#else
5514
  char command[128];
5515
  if ((thd->security_ctx->master_access & want_access))
5516 5517
    return 0;
  get_privilege_desc(command, sizeof(command), want_access);
5518
  my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), command);
5519
  return 1;
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5520
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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monty@tik.mysql.fi committed
5521 5522 5523
}


bk@work.mysql.com's avatar
bk@work.mysql.com committed
5524
/*
5525 5526 5527 5528 5529 5530 5531 5532 5533 5534 5535 5536 5537 5538 5539 5540 5541 5542 5543 5544
  Check the privilege for all used tables.

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

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

  RETURN VALUE
    FALSE - OK
    TRUE  - Access denied
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5545 5546
*/

5547
bool
5548
check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables,
5549
		   bool no_errors)
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bk@work.mysql.com committed
5550
{
5551 5552
  uint found=0;
  ulong found_access=0;
5553 5554
  TABLE_LIST *org_tables= tables;
  TABLE_LIST *first_not_own_table= thd->lex->first_not_own_table();
5555
  Security_context *sctx= thd->security_ctx, *backup_ctx= thd->security_ctx;
5556
  /*
5557 5558 5559
    The check that first_not_own_table is not reached is for the case when
    the given table list refers to the list for prelocking (contains tables
    of other queries). For simple queries first_not_own_table is 0.
5560
  */
5561
  for (; tables != first_not_own_table; tables= tables->next_global)
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bk@work.mysql.com committed
5562
  {
5563 5564 5565 5566 5567
    if (tables->security_ctx)
      sctx= tables->security_ctx;
    else
      sctx= backup_ctx;

5568
    if (tables->schema_table && 
5569
        (want_access & ~(SELECT_ACL | EXTRA_ACL | FILE_ACL)))
5570 5571 5572
    {
      if (!no_errors)
        my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
5573
                 sctx->priv_user, sctx->priv_host,
5574 5575 5576
                 information_schema_name.str);
      return TRUE;
    }
5577 5578 5579 5580 5581
    /*
       Register access for view underlying table.
       Remove SHOW_VIEW_ACL, because it will be checked during making view
     */
    tables->grant.orig_want_privilege= (want_access & ~SHOW_VIEW_ACL);
5582
    if (tables->derived || tables->schema_table ||
5583
        (tables->table && (int)tables->table->s->tmp_table) ||
5584 5585
        my_tz_check_n_skip_implicit_tables(&tables,
                                           thd->lex->time_zone_tables_used))
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Sinisa@sinisa.nasamreza.org committed
5586
      continue;
5587 5588
    thd->security_ctx= sctx;
    if ((sctx->master_access & want_access) ==
5589
        (want_access & ~EXTRA_ACL) &&
5590
	thd->db)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5591
      tables->grant.privilege= want_access;
5592
    else if (tables->db && thd->db && strcmp(tables->db, thd->db) == 0)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5593 5594 5595 5596 5597
    {
      if (found && !grant_option)		// db already checked
	tables->grant.privilege=found_access;
      else
      {
5598
	if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
5599
			 0, no_errors, test(tables->schema_table)))
5600
	  goto deny;                            // Access denied
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bk@work.mysql.com committed
5601
	found_access=tables->grant.privilege;
5602
	found=1;
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bk@work.mysql.com committed
5603 5604
      }
    }
5605
    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
5606
			  0, no_errors, test(tables->schema_table)))
5607
      goto deny;
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bk@work.mysql.com committed
5608
  }
5609
  thd->security_ctx= backup_ctx;
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bk@work.mysql.com committed
5610
  if (grant_option)
5611
    return check_grant(thd,want_access & ~EXTRA_ACL,org_tables,
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bell@sanja.is.com.ua committed
5612
		       test(want_access & EXTRA_ACL), UINT_MAX, no_errors);
bk@work.mysql.com's avatar
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5613
  return FALSE;
5614 5615 5616
deny:
  thd->security_ctx= backup_ctx;
  return TRUE;
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5617 5618
}

5619

5620
bool
5621 5622
check_routine_access(THD *thd, ulong want_access,char *db, char *name,
		     bool is_proc, bool no_errors)
5623 5624 5625 5626 5627
{
  TABLE_LIST tables[1];
  
  bzero((char *)tables, sizeof(TABLE_LIST));
  tables->db= db;
5628
  tables->table_name= tables->alias= name;
5629
  
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5630 5631 5632 5633 5634 5635 5636
  /*
    The following test is just a shortcut for check_access() (to avoid
    calculating db_access) under the assumption that it's common to
    give persons global right to execute all stored SP (but not
    necessary to create them).
  */
  if ((thd->security_ctx->master_access & want_access) == want_access)
5637 5638
    tables->grant.privilege= want_access;
  else if (check_access(thd,want_access,db,&tables->grant.privilege,
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monty@mysql.com committed
5639
			0, no_errors, 0))
5640 5641
    return TRUE;
  
5642
#ifndef NO_EMBEDDED_ACCESS_CHECKS
5643
  if (grant_option)
5644
    return check_grant_routine(thd, want_access, tables, is_proc, no_errors);
5645
#endif
5646 5647 5648 5649

  return FALSE;
}

5650 5651 5652 5653 5654 5655 5656 5657 5658 5659 5660 5661 5662 5663 5664

/*
  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
*/

5665 5666
bool check_some_routine_access(THD *thd, const char *db, const char *name,
                               bool is_proc)
5667 5668
{
  ulong save_priv;
5669
  if (thd->security_ctx->master_access & SHOW_PROC_ACLS)
5670
    return FALSE;
5671 5672 5673 5674 5675
  /*
    There are no routines in information_schema db. So we can safely
    pass zero to last paramter of check_access function
  */
  if (!check_access(thd, SHOW_PROC_ACLS, db, &save_priv, 0, 1, 0) ||
5676 5677
      (save_priv & SHOW_PROC_ACLS))
    return FALSE;
5678
  return check_routine_level_acl(thd, db, name, is_proc);
5679 5680 5681
}


5682 5683 5684 5685 5686 5687 5688 5689 5690 5691 5692 5693 5694 5695 5696 5697 5698 5699 5700 5701 5702 5703 5704 5705 5706
/*
  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,
5707 5708
                        &table->grant.privilege, 0, 1,
                        test(table->schema_table)) &&
5709 5710 5711 5712 5713 5714 5715 5716 5717
          !grant_option || !check_grant(thd, access, table, 0, 1, 1))
        DBUG_RETURN(0);
    }
  }
  DBUG_PRINT("exit",("no matching access rights"));
  DBUG_RETURN(1);
}


5718 5719
bool check_merge_table_access(THD *thd, char *db,
			      TABLE_LIST *table_list)
5720 5721 5722 5723
{
  int error=0;
  if (table_list)
  {
5724
    /* Check that all tables use the current database */
5725
    TABLE_LIST *tmp;
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VIEW  
bell@sanja.is.com.ua committed
5726
    for (tmp= table_list; tmp; tmp= tmp->next_local)
5727 5728 5729 5730
    {
      if (!tmp->db || !tmp->db[0])
	tmp->db=db;
    }
5731
    error=check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
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hf@deer.(none) committed
5732
			     table_list,0);
5733 5734 5735 5736
  }
  return error;
}

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hf@deer.(none) committed
5737

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5738 5739 5740 5741 5742 5743 5744 5745 5746 5747
/****************************************************************************
	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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5748 5749 5750 5751
#ifndef DBUG_OFF
long max_stack_used;
#endif

5752
#ifndef EMBEDDED_LIBRARY
5753 5754 5755 5756 5757 5758 5759 5760
/*
  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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5761 5762
{
  long stack_used;
5763
  DBUG_ASSERT(thd == current_thd);
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5764
  if ((stack_used=used_stack(thd->thread_stack,(char*) &stack_used)) >=
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5765
      (long) (thread_stack - margin))
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bk@work.mysql.com committed
5766
  {
5767 5768 5769
    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));
5770
    thd->fatal_error();
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5771 5772
    return 1;
  }
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5773 5774 5775
#ifndef DBUG_OFF
  max_stack_used= max(max_stack_used, stack_used);
#endif
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5776 5777
  return 0;
}
5778
#endif /* EMBEDDED_LIBRARY */
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5779 5780 5781 5782

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

5783
bool my_yyoverflow(short **yyss, YYSTYPE **yyvs, ulong *yystacksize)
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bk@work.mysql.com committed
5784
{
5785
  LEX	*lex= current_thd->lex;
5786
  ulong old_info=0;
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5787 5788 5789 5790 5791 5792 5793 5794 5795 5796 5797 5798 5799 5800 5801 5802 5803 5804 5805 5806 5807 5808 5809 5810 5811 5812
  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;
}


/****************************************************************************
5813
  Initialize global thd variables needed for query
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5814 5815
****************************************************************************/

5816
void
5817
mysql_init_query(THD *thd, uchar *buf, uint length)
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5818 5819
{
  DBUG_ENTER("mysql_init_query");
5820
  lex_start(thd, buf, length);
5821 5822 5823 5824 5825 5826 5827 5828 5829 5830 5831
  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).
5832
   It is not called by substatements of routines.
5833 5834 5835 5836 5837 5838 5839 5840 5841 5842

 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");
5843
  DBUG_ASSERT(!thd->spcont); /* not for substatements of routines */
5844
  thd->free_list= 0;
5845
  thd->select_number= 1;
5846 5847 5848 5849
  /*
    Those two lines below are theoretically unneeded as
    THD::cleanup_after_query() should take care of this already.
  */
5850
  thd->auto_inc_intervals_in_cur_stmt_for_binlog.empty();
5851 5852 5853
  thd->stmt_depends_on_first_successful_insert_id_in_prev_stmt= 0;

  thd->query_start_used= 0;
5854
  thd->is_fatal_error= thd->time_zone_used= 0;
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5855
  thd->server_status&= ~ (SERVER_MORE_RESULTS_EXISTS | 
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5856 5857
                          SERVER_QUERY_NO_INDEX_USED |
                          SERVER_QUERY_NO_GOOD_INDEX_USED);
5858 5859 5860 5861 5862 5863 5864 5865
  /*
    If in autocommit mode and not in a transaction, reset
    OPTION_STATUS_NO_TRANS_UPDATE | OPTION_KEEP_LOG to not get warnings
    in ha_rollback_trans() about some tables couldn't be rolled back.
  */
  if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)))
    thd->options&= ~(OPTION_STATUS_NO_TRANS_UPDATE | OPTION_KEEP_LOG);

5866
  DBUG_ASSERT(thd->security_ctx== &thd->main_security_ctx);
5867
  thd->tmp_table_used= 0;
5868 5869
  if (!thd->in_sub_stmt)
  {
5870
    if (opt_bin_log)
5871
    {
5872
      reset_dynamic(&thd->user_var_events);
5873 5874
      thd->user_var_events_alloc= thd->mem_root;
    }
5875
    thd->clear_error();
5876 5877 5878 5879
    thd->total_warn_count=0;			// Warnings for this query
    thd->rand_used= 0;
    thd->sent_row_count= thd->examined_row_count= 0;
  }
5880 5881 5882 5883
  /*
    Because we come here only for start of top-statements, binlog format is
    constant inside a complex statement (using stored functions) etc.
  */
5884 5885
  thd->reset_current_stmt_binlog_row_based();

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5886 5887 5888
  DBUG_VOID_RETURN;
}

5889

5890 5891 5892
void
mysql_init_select(LEX *lex)
{
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5893
  SELECT_LEX *select_lex= lex->current_select;
5894
  select_lex->init_select();
5895
  lex->wild= 0;
5896 5897
  if (select_lex == &lex->select_lex)
  {
5898
    DBUG_ASSERT(lex->result == 0);
5899 5900
    lex->exchange= 0;
  }
5901 5902
}

5903

5904
bool
5905
mysql_new_select(LEX *lex, bool move_down)
5906
{
5907
  SELECT_LEX *select_lex;
5908
  THD *thd= lex->thd;
5909 5910
  DBUG_ENTER("mysql_new_select");

5911
  if (!(select_lex= new (thd->mem_root) SELECT_LEX()))
5912
    DBUG_RETURN(1);
5913
  select_lex->select_number= ++thd->select_number;
5914
  select_lex->parent_lex= lex; /* Used in init_query. */
5915 5916
  select_lex->init_query();
  select_lex->init_select();
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igor@rurik.mysql.com committed
5917 5918
  lex->nest_level++;
  select_lex->nest_level= lex->nest_level;
5919 5920 5921 5922 5923
  /*
    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.
  */
konstantin@mysql.com's avatar
konstantin@mysql.com committed
5924
  if (thd->stmt_arena->is_stmt_prepare())
5925
    select_lex->uncacheable|= UNCACHEABLE_PREPARE;
5926 5927
  if (move_down)
  {
5928
    SELECT_LEX_UNIT *unit;
5929
    lex->subqueries= TRUE;
5930
    /* first select_lex of subselect or derived table */
5931
    if (!(unit= new (thd->mem_root) SELECT_LEX_UNIT()))
5932
      DBUG_RETURN(1);
5933

5934 5935
    unit->init_query();
    unit->init_select();
5936
    unit->thd= thd;
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bell@sanja.is.com.ua committed
5937
    unit->include_down(lex->current_select);
5938 5939
    unit->link_next= 0;
    unit->link_prev= 0;
5940
    unit->return_to= lex->current_select;
5941
    select_lex->include_down(unit);
5942 5943 5944 5945 5946
    /*
      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;
5947 5948
  }
  else
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bell@sanja.is.com.ua committed
5949
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
5950 5951
    if (lex->current_select->order_list.first && !lex->current_select->braces)
    {
5952
      my_error(ER_WRONG_USAGE, MYF(0), "UNION", "ORDER BY");
5953
      DBUG_RETURN(1);
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
5954
    }
5955
    select_lex->include_neighbour(lex->current_select);
5956 5957 5958 5959 5960
    SELECT_LEX_UNIT *unit= select_lex->master_unit();                              
    if (!unit->fake_select_lex && unit->add_fake_select_lex(lex->thd))
      DBUG_RETURN(1);
    select_lex->context.outer_context= 
                unit->first_select()->context.outer_context;
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bell@sanja.is.com.ua committed
5961
  }
peter@mysql.com's avatar
peter@mysql.com committed
5962

5963
  select_lex->master_unit()->global_parameters= select_lex;
5964
  select_lex->include_global((st_select_lex_node**)&lex->all_selects_list);
5965
  lex->current_select= select_lex;
5966 5967 5968 5969 5970
  /*
    in subquery is SELECT query and we allow resolution of names in SELECT
    list
  */
  select_lex->context.resolve_in_select_list= TRUE;
5971
  DBUG_RETURN(0);
5972
}
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bk@work.mysql.com committed
5973

5974 5975 5976 5977 5978 5979 5980 5981 5982 5983 5984 5985 5986 5987 5988
/*
  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)
{
5989
  THD *thd;
5990
  LEX *lex;
5991
  LEX_STRING tmp, null_lex_string;
5992 5993
  Item *var;
  char buff[MAX_SYS_VAR_LENGTH*2+4+8], *end;
5994
  DBUG_ENTER("create_select_for_variable");
5995 5996

  thd= current_thd;
pem@mysql.telia.com's avatar
pem@mysql.telia.com committed
5997
  lex= thd->lex;
5998 5999 6000 6001
  mysql_init_select(lex);
  lex->sql_command= SQLCOM_SELECT;
  tmp.str= (char*) var_name;
  tmp.length=strlen(var_name);
6002
  bzero((char*) &null_lex_string.str, sizeof(null_lex_string));
6003 6004 6005 6006
  /*
    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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monty@mysql.com committed
6007 6008 6009 6010 6011 6012
  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);
  }
6013 6014 6015
  DBUG_VOID_RETURN;
}

6016

monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
6017 6018
void mysql_init_multi_delete(LEX *lex)
{
6019
  lex->sql_command=  SQLCOM_DELETE_MULTI;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
6020
  mysql_init_select(lex);
6021 6022
  lex->select_lex.select_limit= 0;
  lex->unit.select_limit_cnt= HA_POS_ERROR;
6023
  lex->select_lex.table_list.save_and_clear(&lex->auxiliary_table_list);
6024
  lex->lock_option= using_update_log ? TL_READ_NO_INSERT : TL_READ;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
6025 6026
  lex->query_tables= 0;
  lex->query_tables_last= &lex->query_tables;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
6027
}
6028

6029 6030 6031 6032
/*
  When you modify mysql_parse(), you may need to mofify
  mysql_test_parse_for_slave() in this same file.
*/
6033

6034
void mysql_parse(THD *thd, char *inBuf, uint length)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6035 6036
{
  DBUG_ENTER("mysql_parse");
6037 6038 6039

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

6040
  mysql_init_query(thd, (uchar*) inBuf, length);
6041
  if (query_cache_send_result_to_client(thd, inBuf, length) <= 0)
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
6042
  {
6043
    LEX *lex= thd->lex;
6044
    
6045 6046
    sp_cache_flush_obsolete(&thd->sp_proc_cache);
    sp_cache_flush_obsolete(&thd->sp_func_cache);
6047
    
6048
    if (!MYSQLparse((void *)thd) && ! thd->is_fatal_error)
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
6049
    {
hf@deer.(none)'s avatar
hf@deer.(none) committed
6050
#ifndef NO_EMBEDDED_ACCESS_CHECKS
6051
      if (mqh_used && thd->user_connect &&
6052
	  check_mqh(thd, lex->sql_command))
6053 6054 6055 6056
      {
	thd->net.error = 0;
      }
      else
hf@deer.(none)'s avatar
hf@deer.(none) committed
6057
#endif
6058
      {
6059
	if (thd->net.report_error)
6060
	{
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
6061 6062
          delete lex->sphead;
          lex->sphead= NULL;
6063
	}
6064 6065
	else
	{
6066 6067 6068 6069 6070 6071 6072 6073 6074 6075
          /*
            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.
          */
serg@serg.mylan's avatar
serg@serg.mylan committed
6076 6077
          if (lex->found_semicolon &&
              (thd->query_length= (ulong)(lex->found_semicolon - thd->query)))
6078 6079
            thd->query_length--;
          /* Actually execute the query */
6080
	  mysql_execute_command(thd);
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
6081
	  query_cache_end_of_result(thd);
6082
	}
6083
      }
6084
      lex->unit.cleanup();
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
6085 6086
    }
    else
6087
    {
6088
      DBUG_ASSERT(thd->net.report_error);
6089
      DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
6090
			 thd->is_fatal_error));
6091 6092 6093 6094 6095

      /*
        The first thing we do after parse error is freeing sp_head to
        ensure that we have restored original memroot.
      */
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
6096
      if (lex->sphead)
6097
      {
monty@mysql.com's avatar
monty@mysql.com committed
6098
	/* Clean up after failed stored procedure/function */
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
6099 6100 6101
	delete lex->sphead;
	lex->sphead= NULL;
      }
6102 6103
      query_cache_abort(&thd->net);
      lex->unit.cleanup();
6104
    }
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
6105
    thd->proc_info="freeing items";
6106
    thd->end_statement();
6107
    thd->cleanup_after_query();
6108
    DBUG_ASSERT(thd->change_list.is_empty());
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
6109
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6110 6111 6112 6113
  DBUG_VOID_RETURN;
}


monty@mysql.com's avatar
monty@mysql.com committed
6114
#ifdef HAVE_REPLICATION
6115 6116 6117 6118 6119 6120 6121 6122 6123 6124 6125
/*
  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)
{
6126
  LEX *lex= thd->lex;
6127
  bool error= 0;
monty@mysql.com's avatar
monty@mysql.com committed
6128
  DBUG_ENTER("mysql_test_parse_for_slave");
6129

6130
  mysql_init_query(thd, (uchar*) inBuf, length);
6131
  if (!MYSQLparse((void*) thd) && ! thd->is_fatal_error &&
6132
      all_tables_not_ok(thd,(TABLE_LIST*) lex->select_lex.table_list.first))
monty@mysql.com's avatar
monty@mysql.com committed
6133
    error= 1;                  /* Ignore question */
6134
  thd->end_statement();
6135
  thd->cleanup_after_query();
monty@mysql.com's avatar
monty@mysql.com committed
6136
  DBUG_RETURN(error);
6137
}
monty@mysql.com's avatar
monty@mysql.com committed
6138
#endif
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bk@work.mysql.com committed
6139

6140

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monty@mysql.com committed
6141

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bk@work.mysql.com committed
6142 6143 6144 6145 6146
/*****************************************************************************
** Store field definition for create
** Return 0 if ok
******************************************************************************/

monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
6147
bool add_field_to_list(THD *thd, char *field_name, enum_field_types type,
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6148
		       char *length, char *decimals,
6149
		       uint type_modifier,
6150 6151
		       Item *default_value, Item *on_update_value,
                       LEX_STRING *comment,
6152 6153
		       char *change,
                       List<String> *interval_list, CHARSET_INFO *cs,
6154
		       uint uint_geom_type)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6155 6156
{
  register create_field *new_field;
6157
  LEX  *lex= thd->lex;
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bk@work.mysql.com committed
6158 6159 6160 6161
  DBUG_ENTER("add_field_to_list");

  if (strlen(field_name) > NAME_LEN)
  {
6162
    my_error(ER_TOO_LONG_IDENT, MYF(0), field_name); /* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6163 6164 6165 6166 6167
    DBUG_RETURN(1);				/* purecov: inspected */
  }
  if (type_modifier & PRI_KEY_FLAG)
  {
    lex->col_list.push_back(new key_part_spec(field_name,0));
6168 6169
    lex->key_list.push_back(new Key(Key::PRIMARY, NullS,
                                    &default_key_create_info,
6170
				    0, lex->col_list));
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bk@work.mysql.com committed
6171 6172 6173 6174 6175
    lex->col_list.empty();
  }
  if (type_modifier & (UNIQUE_FLAG | UNIQUE_KEY_FLAG))
  {
    lex->col_list.push_back(new key_part_spec(field_name,0));
6176 6177
    lex->key_list.push_back(new Key(Key::UNIQUE, NullS,
                                    &default_key_create_info, 0,
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bk@work.mysql.com committed
6178 6179 6180 6181
				    lex->col_list));
    lex->col_list.empty();
  }

6182
  if (default_value)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6183
  {
6184
    /* 
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6185 6186
      Default value should be literal => basic constants =>
      no need fix_fields()
6187 6188 6189
      
      We allow only one function as part of default value - 
      NOW() as default for TIMESTAMP type.
6190
    */
6191 6192 6193
    if (default_value->type() == Item::FUNC_ITEM && 
        !(((Item_func*)default_value)->functype() == Item_func::NOW_FUNC &&
         type == FIELD_TYPE_TIMESTAMP))
6194
    {
6195
      my_error(ER_INVALID_DEFAULT, MYF(0), field_name);
6196 6197 6198
      DBUG_RETURN(1);
    }
    else if (default_value->type() == Item::NULL_ITEM)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6199
    {
6200
      default_value= 0;
6201 6202 6203
      if ((type_modifier & (NOT_NULL_FLAG | AUTO_INCREMENT_FLAG)) ==
	  NOT_NULL_FLAG)
      {
6204
	my_error(ER_INVALID_DEFAULT, MYF(0), field_name);
6205 6206 6207 6208 6209
	DBUG_RETURN(1);
      }
    }
    else if (type_modifier & AUTO_INCREMENT_FLAG)
    {
6210
      my_error(ER_INVALID_DEFAULT, MYF(0), field_name);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6211 6212 6213
      DBUG_RETURN(1);
    }
  }
6214 6215 6216

  if (on_update_value && type != FIELD_TYPE_TIMESTAMP)
  {
6217
    my_error(ER_INVALID_ON_UPDATE, MYF(0), field_name);
6218 6219
    DBUG_RETURN(1);
  }
6220

6221 6222 6223 6224 6225 6226
  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.
    */
msvensson@neptunus.(none)'s avatar
msvensson@neptunus.(none) committed
6227
    char buf[32];
6228
    my_snprintf(buf, sizeof(buf), "TIMESTAMP(%s)", length);
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
6229
    WARN_DEPRECATED(thd, "5.2", buf, "'TIMESTAMP'");
6230 6231
  }

6232 6233 6234 6235
  if (!(new_field= new create_field()) ||
      new_field->init(thd, field_name, type, length, decimals, type_modifier,
                      default_value, on_update_value, comment, change,
                      interval_list, cs, uint_geom_type))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6236
    DBUG_RETURN(1);
6237 6238 6239 6240 6241 6242

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

6243

bk@work.mysql.com's avatar
bk@work.mysql.com committed
6244 6245 6246 6247
/* Store position for column in ALTER TABLE .. ADD column */

void store_position_for_column(const char *name)
{
6248
  current_thd->lex->last_field->after=my_const_cast(char*) (name);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6249 6250 6251
}

bool
6252
add_proc_to_list(THD* thd, Item *item)
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bk@work.mysql.com committed
6253 6254 6255 6256
{
  ORDER *order;
  Item	**item_ptr;

monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
6257
  if (!(order = (ORDER *) thd->alloc(sizeof(ORDER)+sizeof(Item*))))
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bk@work.mysql.com committed
6258 6259 6260 6261 6262
    return 1;
  item_ptr = (Item**) (order+1);
  *item_ptr= item;
  order->item=item_ptr;
  order->free_me=0;
6263
  thd->lex->proc_list.link_in_list((byte*) order,(byte**) &order->next);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6264 6265 6266 6267 6268 6269 6270 6271 6272
  return 0;
}


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


monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
6273
bool add_to_list(THD *thd, SQL_LIST &list,Item *item,bool asc)
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bk@work.mysql.com committed
6274 6275 6276
{
  ORDER *order;
  DBUG_ENTER("add_to_list");
6277
  if (!(order = (ORDER *) thd->alloc(sizeof(ORDER))))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6278
    DBUG_RETURN(1);
6279 6280
  order->item_ptr= item;
  order->item= &order->item_ptr;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6281 6282 6283
  order->asc = asc;
  order->free_me=0;
  order->used=0;
6284
  order->counter_used= 0;
6285
  list.link_in_list((byte*) order,(byte**) &order->next);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6286 6287 6288 6289
  DBUG_RETURN(0);
}


monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
6290 6291 6292 6293 6294 6295 6296 6297 6298 6299
/*
  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
6300
			TL_OPTION_ALIAS	        an alias in multi table DELETE
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monty@mashka.mysql.fi committed
6301 6302 6303 6304 6305 6306 6307 6308 6309
    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
*/

monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
6310 6311
TABLE_LIST *st_select_lex::add_table_to_list(THD *thd,
					     Table_ident *table,
6312
					     LEX_STRING *alias,
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
6313 6314
					     ulong table_options,
					     thr_lock_type lock_type,
6315 6316
					     List<String> *use_index_arg,
					     List<String> *ignore_index_arg,
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
6317
                                             LEX_STRING *option)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6318 6319
{
  register TABLE_LIST *ptr;
6320
  TABLE_LIST *previous_table_ref; /* The table preceding the current one. */
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bk@work.mysql.com committed
6321
  char *alias_str;
6322
  LEX *lex= thd->lex;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6323
  DBUG_ENTER("add_table_to_list");
6324
  LINT_INIT(previous_table_ref);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6325 6326 6327 6328

  if (!table)
    DBUG_RETURN(0);				// End of memory
  alias_str= alias ? alias->str : table->table.str;
6329 6330
  if (!test(table_options & TL_OPTION_ALIAS) && 
      check_table_name(table->table.str, table->table.length))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6331
  {
6332
    my_error(ER_WRONG_TABLE_NAME, MYF(0), table->table.str);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6333 6334
    DBUG_RETURN(0);
  }
6335 6336 6337

  if (table->is_derived_table() == FALSE && table->db.str &&
      check_db_name(table->db.str))
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
6338 6339 6340 6341
  {
    my_error(ER_WRONG_DB_NAME, MYF(0), table->db.str);
    DBUG_RETURN(0);
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6342 6343

  if (!alias)					/* Alias is case sensitive */
6344 6345 6346
  {
    if (table->sel)
    {
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bell@sanja.is.com.ua committed
6347 6348
      my_message(ER_DERIVED_MUST_HAVE_ALIAS,
                 ER(ER_DERIVED_MUST_HAVE_ALIAS), MYF(0));
6349 6350
      DBUG_RETURN(0);
    }
6351
    if (!(alias_str=thd->memdup(alias_str,table->table.length+1)))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6352
      DBUG_RETURN(0);
6353
  }
6354
  if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6355
    DBUG_RETURN(0);				/* purecov: inspected */
peter@mysql.com's avatar
peter@mysql.com committed
6356
  if (table->db.str)
6357 6358 6359 6360
  {
    ptr->db= table->db.str;
    ptr->db_length= table->db.length;
  }
6361 6362
  else if (thd->copy_db_to(&ptr->db, &ptr->db_length))
    DBUG_RETURN(0);
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6363

6364
  ptr->alias= alias_str;
6365 6366
  if (lower_case_table_names && table->table.length)
    my_casedn_str(files_charset_info, table->table.str);
6367 6368
  ptr->table_name=table->table.str;
  ptr->table_name_length=table->table.length;
6369
  ptr->lock_type=   lock_type;
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6370 6371
  ptr->updating=    test(table_options & TL_OPTION_UPDATING);
  ptr->force_index= test(table_options & TL_OPTION_FORCE_INDEX);
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6372
  ptr->ignore_leaves= test(table_options & TL_OPTION_IGNORE_LEAVES);
6373
  ptr->derived=	    table->sel;
6374 6375
  if (!ptr->derived && !my_strcasecmp(system_charset_info, ptr->db,
                                      information_schema_name.str))
6376
  {
6377
    ST_SCHEMA_TABLE *schema_table= find_schema_table(thd, ptr->table_name);
6378 6379
    if (!schema_table ||
        (schema_table->hidden && 
6380
         (sql_command_flags[lex->sql_command] & CF_STATUS_COMMAND) == 0))
6381
    {
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6382
      my_error(ER_UNKNOWN_TABLE, MYF(0),
6383
               ptr->table_name, information_schema_name.str);
6384 6385
      DBUG_RETURN(0);
    }
6386
    ptr->schema_table_name= ptr->table_name;
6387 6388
    ptr->schema_table= schema_table;
  }
6389
  ptr->select_lex=  lex->current_select;
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6390
  ptr->cacheable_table= 1;
6391 6392 6393 6394 6395 6396
  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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6397
  ptr->option= option ? option->str : 0;
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6398
  /* check that used name is unique */
6399
  if (lock_type != TL_IGNORE)
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6400
  {
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    TABLE_LIST *first_table= (TABLE_LIST*) table_list.first;
    if (lex->sql_command == SQLCOM_CREATE_VIEW)
      first_table= first_table ? first_table->next_local : NULL;
    for (TABLE_LIST *tables= first_table ;
6405
	 tables ;
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VIEW  
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6406
	 tables=tables->next_local)
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6407
    {
6408 6409
      if (!my_strcasecmp(table_alias_charset, alias_str, tables->alias) &&
	  !strcmp(ptr->db, tables->db))
6410
      {
6411
	my_error(ER_NONUNIQ_TABLE, MYF(0), alias_str); /* purecov: tested */
6412 6413
	DBUG_RETURN(0);				/* purecov: tested */
      }
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6414 6415
    }
  }
6416 6417 6418
  /* Store the table reference preceding the current one. */
  if (table_list.elements > 0)
  {
6419 6420 6421
    /*
      table_list.next points to the last inserted TABLE_LIST->next_local'
      element
6422
      We don't use the offsetof() macro here to avoid warnings from gcc
6423
    */
6424 6425 6426
    previous_table_ref= (TABLE_LIST*) ((char*) table_list.next -
                                       ((char*) &(ptr->next_local) -
                                        (char*) ptr));
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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;
6435
  }
6436

6437 6438 6439 6440 6441 6442
  /*
    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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6443
  table_list.link_in_list((byte*) ptr, (byte**) &ptr->next_local);
6444
  ptr->next_name_resolution_table= NULL;
6445
  /* Link table in global list (all used tables) */
6446
  lex->add_to_query_tables(ptr);
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6447 6448 6449
  DBUG_RETURN(ptr);
}

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6450

6451 6452 6453 6454
/*
  Initialize a new table list for a nested join

  SYNOPSIS
6455
    init_nested_join()
6456
    thd         current thread
6457

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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");
6477

6478 6479
  if (!(ptr= (TABLE_LIST*) thd->calloc(ALIGN_SIZE(sizeof(TABLE_LIST))+
                                       sizeof(NESTED_JOIN))))
6480
    DBUG_RETURN(1);
6481 6482 6483
  nested_join= ptr->nested_join=
    ((NESTED_JOIN*) ((byte*) ptr + ALIGN_SIZE(sizeof(TABLE_LIST))));

6484 6485 6486 6487 6488 6489 6490 6491 6492 6493 6494 6495 6496 6497 6498 6499 6500 6501 6502 6503
  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
6504
    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;
6514
  NESTED_JOIN *nested_join;
6515
  DBUG_ENTER("end_nested_join");
6516

6517
  DBUG_ASSERT(embedding);
6518 6519 6520
  ptr= embedding;
  join_list= ptr->join_list;
  embedding= ptr->embedding;
6521
  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;
  }
6531
  else if (nested_join->join_list.elements == 0)
6532 6533
  {
    join_list->pop();
6534
    ptr= 0;                                     // return value
6535
  }
6536 6537 6538 6539 6540 6541 6542 6543
  DBUG_RETURN(ptr);
}


/*
  Nest last join operation

  SYNOPSIS
6544
    nest_last_join()
6545 6546 6547 6548 6549 6550
    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;
6560
  List<TABLE_LIST> *embedded_list;
6561
  DBUG_ENTER("nest_last_join");
6562

6563 6564
  if (!(ptr= (TABLE_LIST*) thd->calloc(ALIGN_SIZE(sizeof(TABLE_LIST))+
                                       sizeof(NESTED_JOIN))))
6565
    DBUG_RETURN(0);
6566 6567 6568
  nested_join= ptr->nested_join=
    ((NESTED_JOIN*) ((byte*) ptr + ALIGN_SIZE(sizeof(TABLE_LIST))));

6569 6570
  ptr->embedding= embedding;
  ptr->join_list= join_list;
6571
  embedded_list= &nested_join->join_list;
6572
  embedded_list->empty();
6573 6574

  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
6633 6634 6635

  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
*/

6659
TABLE_LIST *st_select_lex::convert_right_join()
6660 6661
{
  TABLE_LIST *tab2= join_list->pop();
6662
  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);
}

6672 6673 6674 6675 6676 6677 6678 6679 6680 6681 6682 6683 6684
/*
  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
*/

6685
void st_select_lex::set_lock_for_tables(thr_lock_type lock_type)
6686 6687 6688 6689 6690 6691
{
  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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6702

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6703 6704 6705 6706 6707 6708 6709 6710 6711 6712 6713 6714 6715 6716 6717 6718 6719 6720 6721 6722 6723 6724 6725 6726 6727 6728 6729 6730 6731
/*
  Create a fake SELECT_LEX for a unit

  SYNOPSIS:
    add_fake_select_lex()
    thd			   thread handle

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

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

bool st_select_lex_unit::add_fake_select_lex(THD *thd)
{
  SELECT_LEX *first_sl= first_select();
  DBUG_ENTER("add_fake_select_lex");
  DBUG_ASSERT(!fake_select_lex);
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6732

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6733 6734 6735 6736 6737
  if (!(fake_select_lex= new (thd->mem_root) SELECT_LEX()))
      DBUG_RETURN(1);
  fake_select_lex->include_standalone(this, 
                                      (SELECT_LEX_NODE**)&fake_select_lex);
  fake_select_lex->select_number= INT_MAX;
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6738
  fake_select_lex->parent_lex= thd->lex; /* Used in init_query. */
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6739 6740
  fake_select_lex->make_empty_select();
  fake_select_lex->linkage= GLOBAL_OPTIONS_TYPE;
6741 6742
  fake_select_lex->select_limit= 0;

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6743
  fake_select_lex->context.outer_context=first_sl->context.outer_context;
6744 6745 6746
  /* allow item list resolving in fake select for ORDER BY */
  fake_select_lex->context.resolve_in_select_list= TRUE;
  fake_select_lex->context.select_lex= fake_select_lex;
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6747 6748 6749 6750 6751 6752 6753 6754 6755 6756 6757 6758 6759

  if (!first_sl->next_select())
  {
    /* 
      This works only for 
      (SELECT ... ORDER BY list [LIMIT n]) ORDER BY order_list [LIMIT m],
      (SELECT ... LIMIT n) ORDER BY order_list [LIMIT m]
      just before the parser starts processing order_list
    */ 
    global_parameters= fake_select_lex;
    fake_select_lex->no_table_names_allowed= 1;
    thd->lex->current_select= fake_select_lex;
  }
6760
  thd->lex->pop_context();
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6761 6762 6763
  DBUG_RETURN(0);
}

6764

6765
/*
6766 6767
  Push a new name resolution context for a JOIN ... ON clause to the
  context stack of a query block.
6768 6769

  SYNOPSIS
6770
    push_new_name_resolution_context()
6771
    thd       pointer to current thread
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6772
    left_op   left  operand of the JOIN
6773 6774 6775 6776
    right_op  rigth operand of the JOIN

  DESCRIPTION
    Create a new name resolution context for a JOIN ... ON clause,
6777 6778 6779
    set the first and last leaves of the list of table references
    to be used for name resolution, and push the newly created
    context to the stack of contexts of the query.
6780 6781

  RETURN
6782 6783
    FALSE  if all is OK
    TRUE   if a memory allocation error occured
6784 6785
*/

6786 6787 6788
bool
push_new_name_resolution_context(THD *thd,
                                 TABLE_LIST *left_op, TABLE_LIST *right_op)
6789 6790
{
  Name_resolution_context *on_context;
6791
  if (!(on_context= new (thd->mem_root) Name_resolution_context))
6792
    return TRUE;
6793 6794 6795 6796 6797
  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();
6798
  return thd->lex->push_context(on_context);
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}


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

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

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

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

void add_join_on(TABLE_LIST *b, Item *expr)
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6819
{
6820
  if (expr)
6821
  {
6822
    if (!b->on_expr)
6823
      b->on_expr= expr;
6824 6825
    else
    {
6826 6827 6828 6829 6830 6831
      /*
        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);
6832 6833
    }
    b->on_expr->top_level_item();
6834
  }
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6835 6836 6837
}


6838
/*
6839 6840
  Mark that there is a NATURAL JOIN or JOIN ... USING between two
  tables.
6841 6842 6843

  SYNOPSIS
    add_join_natural()
6844 6845 6846 6847
    a			Left join argument
    b			Right join argument
    using_fields        Field names from USING clause
  
6848
  IMPLEMENTATION
6849 6850 6851 6852 6853 6854 6855 6856 6857 6858
    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
6873 6874
*/

6875
void add_join_natural(TABLE_LIST *a, TABLE_LIST *b, List<String> *using_fields)
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6876
{
6877 6878
  b->natural_join= a;
  b->join_using_fields= using_fields;
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}

6881

6882
/*
6883 6884 6885 6886
  Reload/resets privileges and the different caches.

  SYNOPSIS
    reload_acl_and_cache()
6887
    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
6899
    !=0  error.  thd->killed or thd->net.report_error is set
6900 6901
*/

6902 6903
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 */
6907
  bool tmp_write_to_binlog= 1;
6908

6909
  DBUG_ASSERT(!thd || !thd->in_sub_stmt);
6910

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SCRUM  
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6911
#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  if (options & REFRESH_GRANT)
  {
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    THD *tmp_thd= 0;
    /*
      If reload_acl_and_cache() is called from SIGHUP handler we have to
      allocate temporary THD for execution of acl_reload()/grant_reload().
    */
    if (!thd && (thd= (tmp_thd= new THD)))
6920 6921
    {
      thd->thread_stack= (char*) &tmp_thd;
6922
      thd->store_globals();
6923
    }
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    if (thd)
    {
      (void)acl_reload(thd);
      (void)grant_reload(thd);
    }
    if (tmp_thd)
    {
      delete tmp_thd;
      /* Remember that we don't have a THD */
      my_pthread_setspecific_ptr(THR_THD,  0);
      thd= 0;
    }
6936
    reset_mqh((LEX_USER *)NULL, TRUE);
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bk@work.mysql.com committed
6937
  }
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
6938
#endif
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6939 6940
  if (options & REFRESH_LOG)
  {
6941
    /*
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
6942
      Flush the normal query log, the update log, the binary log,
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
6943 6944
      the slow query log, the relay log (if it exists) and the log
      tables.
6945
    */
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
6946

6947
    /*
monty@mysql.com's avatar
monty@mysql.com committed
6948 6949 6950 6951
      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)
6952 6953
    */
    tmp_write_to_binlog= 0;
6954
    mysql_bin_log.rotate_and_purge(RP_FORCE_ROTATE);
6955
#ifdef HAVE_REPLICATION
6956
    pthread_mutex_lock(&LOCK_active_mi);
6957
    rotate_relay_log(active_mi);
6958
    pthread_mutex_unlock(&LOCK_active_mi);
6959
#endif
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
6960 6961 6962 6963 6964

    /* flush slow and general logs */
    logger.flush_logs(thd);

    if (ha_flush_logs(NULL))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6965
      result=1;
6966 6967
    if (flush_error_log())
      result=1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6968
  }
6969
#ifdef HAVE_QUERY_CACHE
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
6970 6971
  if (options & REFRESH_QUERY_CACHE_FREE)
  {
6972
    query_cache.pack();				// FLUSH QUERY CACHE
6973
    options &= ~REFRESH_QUERY_CACHE;    // Don't flush cache, just free memory
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
6974 6975 6976
  }
  if (options & (REFRESH_TABLES | REFRESH_QUERY_CACHE))
  {
6977
    query_cache.flush();			// RESET QUERY CACHE
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
6978
  }
6979
#endif /*HAVE_QUERY_CACHE*/
6980 6981 6982 6983 6984
  /*
    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)) 
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6985
  {
6986
    if ((options & REFRESH_READ_LOCK) && thd)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6987
    {
6988 6989 6990 6991 6992 6993 6994 6995 6996 6997 6998
      /*
        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++)
monty@mysql.com's avatar
monty@mysql.com committed
6999
        {
7000 7001 7002 7003 7004
          if ((*lock_p)->type == TL_WRITE)
          {
            my_error(ER_LOCK_OR_ACTIVE_TRANSACTION, MYF(0));
            return 1;
          }
monty@mysql.com's avatar
monty@mysql.com committed
7005
        }
7006
      }
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
7007 7008 7009 7010
      /*
	Writing to the binlog could cause deadlocks, as we don't log
	UNLOCK TABLES
      */
7011
      tmp_write_to_binlog= 0;
7012
      if (lock_global_read_lock(thd))
7013
	return 1;                               // Killed
7014 7015
      result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1,
                                 tables);
7016
      if (make_global_read_lock_block_commit(thd)) // Killed
7017 7018 7019 7020 7021
      {
        /* Don't leave things in a half-locked state */
        unlock_global_read_lock(thd);
        return 1;
      }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
7022
    }
7023 7024
    else
      result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1, tables);
7025
    my_dbopt_cleanup();
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bk@work.mysql.com committed
7026 7027 7028
  }
  if (options & REFRESH_HOSTS)
    hostname_cache_refresh();
monty@mysql.com's avatar
monty@mysql.com committed
7029
  if (thd && (options & REFRESH_STATUS))
7030
    refresh_status(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
7031 7032
  if (options & REFRESH_THREADS)
    flush_thread_cache();
7033
#ifdef HAVE_REPLICATION
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bk@work.mysql.com committed
7034
  if (options & REFRESH_MASTER)
7035
  {
7036
    DBUG_ASSERT(thd);
7037
    tmp_write_to_binlog= 0;
7038
    if (reset_master(thd))
7039
    {
7040
      result=1;
7041 7042
      thd->fatal_error();                       // Ensure client get error
    }
7043
  }
7044
#endif
7045
#ifdef OPENSSL
7046 7047 7048 7049 7050 7051
   if (options & REFRESH_DES_KEY_FILE)
   {
     if (des_key_file)
       result=load_des_key_file(des_key_file);
   }
#endif
7052
#ifdef HAVE_REPLICATION
7053 7054
 if (options & REFRESH_SLAVE)
 {
7055
   tmp_write_to_binlog= 0;
7056
   pthread_mutex_lock(&LOCK_active_mi);
7057
   if (reset_slave(thd, active_mi))
7058
     result=1;
7059
   pthread_mutex_unlock(&LOCK_active_mi);
7060
 }
7061
#endif
7062
 if (options & REFRESH_USER_RESOURCES)
monty@mysql.com's avatar
monty@mysql.com committed
7063
   reset_mqh((LEX_USER *) NULL);
7064
 *write_to_binlog= tmp_write_to_binlog;
7065
 return result;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
7066 7067
}

7068

7069
/*
7070
  kills a thread
7071 7072 7073 7074 7075

  SYNOPSIS
    kill_one_thread()
    thd			Thread class
    id			Thread id
7076
    only_kill_query     Should it kill the query or the connection
7077 7078 7079 7080 7081

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

7082
uint kill_one_thread(THD *thd, ulong id, bool only_kill_query)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
7083 7084 7085
{
  THD *tmp;
  uint error=ER_NO_SUCH_THREAD;
7086 7087
  DBUG_ENTER("kill_one_thread");
  DBUG_PRINT("enter", ("id=%lu only_kill=%d", id, only_kill_query));
7088 7089
  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For unlink from list
  I_List_iterator<THD> it(threads);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
7090 7091
  while ((tmp=it++))
  {
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
7092 7093
    if (tmp->command == COM_DAEMON)
      continue;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
7094 7095
    if (tmp->thread_id == id)
    {
7096 7097
      pthread_mutex_lock(&tmp->LOCK_delete);	// Lock from delete
      break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
7098 7099 7100
    }
  }
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
7101 7102
  if (tmp)
  {
7103 7104
    if ((thd->security_ctx->master_access & SUPER_ACL) ||
	!strcmp(thd->security_ctx->user, tmp->security_ctx->user))
7105
    {
hf@genie.(none)'s avatar
SCRUM  
hf@genie.(none) committed
7106
      tmp->awake(only_kill_query ? THD::KILL_QUERY : THD::KILL_CONNECTION);
7107 7108 7109 7110 7111 7112
      error=0;
    }
    else
      error=ER_KILL_DENIED_ERROR;
    pthread_mutex_unlock(&tmp->LOCK_delete);
  }
7113 7114 7115 7116
  DBUG_PRINT("exit", ("%d", error));
  DBUG_RETURN(error);
}

7117

7118 7119 7120 7121 7122 7123 7124 7125 7126 7127 7128 7129 7130 7131
/*
  kills a thread and sends response

  SYNOPSIS
    sql_kill()
    thd			Thread class
    id			Thread id
    only_kill_query     Should it kill the query or the connection
*/

void sql_kill(THD *thd, ulong id, bool only_kill_query)
{
  uint error;
  if (!(error= kill_one_thread(thd, id, only_kill_query)))
7132
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
7133
  else
7134
    my_error(error, MYF(0), id);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
7135 7136
}

timour@mysql.com's avatar
timour@mysql.com committed
7137

7138 7139
	/* If pointer is not a null pointer, append filename to it */

cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
7140 7141
bool append_file_to_dir(THD *thd, const char **filename_ptr,
                        const char *table_name)
7142
{
7143
  char buff[FN_REFLEN],*ptr, *end;
7144 7145 7146 7147 7148 7149 7150
  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))
  {
7151
    my_error(ER_WRONG_TABLE_NAME, MYF(0), *filename_ptr);
7152 7153 7154 7155
    return 1;
  }
  /* Fix is using unix filename format on dos */
  strmov(buff,*filename_ptr);
7156
  end=convert_dirname(buff, *filename_ptr, NullS);
7157
  if (!(ptr=thd->alloc((uint) (end-buff)+(uint) strlen(table_name)+1)))
7158 7159
    return 1;					// End of memory
  *filename_ptr=ptr;
7160
  strxmov(ptr,buff,table_name,NullS);
7161 7162
  return 0;
}
7163

7164

7165 7166 7167 7168 7169 7170 7171 7172 7173 7174 7175 7176 7177 7178
/*
  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;
7179 7180
  LEX *lex= thd->lex;
  if (lex->current_select != &lex->select_lex)
7181 7182
  {
    char command[80];
7183 7184
    strmake(command, lex->yylval->symbol.str,
	    min(lex->yylval->symbol.length, sizeof(command)-1));
7185
    my_error(ER_CANT_USE_OPTION_HERE, MYF(0), command);
7186 7187 7188 7189
    return 1;
  }
  return 0;
}
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7190

7191

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bell@sanja.is.com.ua committed
7192
Comp_creator *comp_eq_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7193
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7194
  return invert?(Comp_creator *)&ne_creator:(Comp_creator *)&eq_creator;
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bell@sanja.is.com.ua committed
7195 7196
}

7197

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bell@sanja.is.com.ua committed
7198
Comp_creator *comp_ge_creator(bool invert)
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bell@sanja.is.com.ua committed
7199
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7200
  return invert?(Comp_creator *)&lt_creator:(Comp_creator *)&ge_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7201 7202
}

7203

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bell@sanja.is.com.ua committed
7204
Comp_creator *comp_gt_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7205
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7206
  return invert?(Comp_creator *)&le_creator:(Comp_creator *)&gt_creator;
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bell@sanja.is.com.ua committed
7207 7208
}

7209

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bell@sanja.is.com.ua committed
7210
Comp_creator *comp_le_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7211
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7212
  return invert?(Comp_creator *)&gt_creator:(Comp_creator *)&le_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7213 7214
}

7215

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bell@sanja.is.com.ua committed
7216
Comp_creator *comp_lt_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7217
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7218
  return invert?(Comp_creator *)&ge_creator:(Comp_creator *)&lt_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7219 7220
}

7221

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bell@sanja.is.com.ua committed
7222
Comp_creator *comp_ne_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7223
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7224
  return invert?(Comp_creator *)&eq_creator:(Comp_creator *)&ne_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7225
}
7226 7227 7228 7229 7230 7231 7232 7233 7234 7235 7236 7237 7238 7239 7240 7241 7242 7243 7244 7245


/*
  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)
{
serg@serg.mylan's avatar
serg@serg.mylan committed
7246
  if ((cmp == &comp_eq_creator) && !all)       //  = ANY <=> IN
7247
    return new Item_in_subselect(left_expr, select_lex);
serg@serg.mylan's avatar
serg@serg.mylan committed
7248 7249

  if ((cmp == &comp_ne_creator) && all)        // <> ALL <=> NOT IN
7250 7251 7252
    return new Item_func_not(new Item_in_subselect(left_expr, select_lex));

  Item_allany_subselect *it=
7253
    new Item_allany_subselect(left_expr, cmp, select_lex, all);
7254
  if (all)
7255
    return it->upper_item= new Item_func_not_all(it);	/* ALL */
7256

7257
  return it->upper_item= new Item_func_nop_all(it);      /* ANY/SOME */
7258
}
7259 7260


7261 7262 7263 7264 7265 7266 7267 7268 7269 7270 7271 7272
/*
  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.
*/

7273
bool mysql_create_index(THD *thd, TABLE_LIST *table_list, List<Key> &keys)
7274 7275
{
  List<create_field> fields;
7276 7277
  ALTER_INFO alter_info;
  alter_info.flags= ALTER_ADD_INDEX;
7278 7279 7280
  HA_CREATE_INFO create_info;
  DBUG_ENTER("mysql_create_index");
  bzero((char*) &create_info,sizeof(create_info));
7281
  create_info.db_type= 0;
7282
  create_info.default_table_charset= thd->variables.collation_database;
7283
  DBUG_RETURN(mysql_alter_table(thd,table_list->db,table_list->table_name,
7284
				&create_info, table_list,
7285
				fields, keys, 0, (ORDER*)0,
7286
                                0, &alter_info, 1));
7287 7288 7289
}


7290
bool mysql_drop_index(THD *thd, TABLE_LIST *table_list, ALTER_INFO *alter_info)
7291 7292 7293 7294 7295 7296
{
  List<create_field> fields;
  List<Key> keys;
  HA_CREATE_INFO create_info;
  DBUG_ENTER("mysql_drop_index");
  bzero((char*) &create_info,sizeof(create_info));
7297
  create_info.db_type= 0;
7298
  create_info.default_table_charset= thd->variables.collation_database;
7299 7300
  alter_info->clear();
  alter_info->flags= ALTER_DROP_INDEX;
7301
  DBUG_RETURN(mysql_alter_table(thd,table_list->db,table_list->table_name,
7302
				&create_info, table_list,
7303
				fields, keys, 0, (ORDER*)0,
7304
                                0, alter_info, 1));
7305
}
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merge  
bell@sanja.is.com.ua committed
7306 7307


7308 7309 7310 7311 7312
/*
  Multi update query pre-check

  SYNOPSIS
    multi_update_precheck()
7313
    thd		Thread handler
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VIEW  
bell@sanja.is.com.ua committed
7314
    tables	Global/local table list (have to be the same)
7315

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bell@sanja.is.com.ua committed
7316
  RETURN VALUE
7317 7318
    FALSE OK
    TRUE  Error
7319
*/
7320

7321
bool multi_update_precheck(THD *thd, TABLE_LIST *tables)
7322 7323 7324 7325 7326
{
  const char *msg= 0;
  TABLE_LIST *table;
  LEX *lex= thd->lex;
  SELECT_LEX *select_lex= &lex->select_lex;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
7327
  DBUG_ENTER("multi_update_precheck");
7328 7329 7330

  if (select_lex->item_list.elements != lex->value_list.elements)
  {
7331
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
7332
    DBUG_RETURN(TRUE);
7333 7334 7335 7336 7337
  }
  /*
    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  
bell@sanja.is.com.ua committed
7338
  for (table= tables; table; table= table->next_local)
7339
  {
7340 7341 7342
    if (table->derived)
      table->grant.privilege= SELECT_ACL;
    else if ((check_access(thd, UPDATE_ACL, table->db,
7343 7344
                           &table->grant.privilege, 0, 1,
                           test(table->schema_table)) ||
7345 7346
              grant_option &&
              check_grant(thd, UPDATE_ACL, table, 0, 1, 1)) &&
monty@mysql.com's avatar
monty@mysql.com committed
7347
             (check_access(thd, SELECT_ACL, table->db,
7348 7349
                           &table->grant.privilege, 0, 0,
                           test(table->schema_table)) ||
monty@mysql.com's avatar
monty@mysql.com committed
7350
              grant_option && check_grant(thd, SELECT_ACL, table, 0, 1, 0)))
7351
      DBUG_RETURN(TRUE);
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bell@sanja.is.com.ua committed
7352

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
7353
    table->table_in_first_from_clause= 1;
7354
  }
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7355 7356 7357
  /*
    Is there tables of subqueries?
  */
7358
  if (&lex->select_lex != lex->all_selects_list || lex->time_zone_tables_used)
7359
  {
7360
    DBUG_PRINT("info",("Checking sub query list"));
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
7361
    for (table= tables; table; table= table->next_global)
7362
    {
monty@mysql.com's avatar
monty@mysql.com committed
7363 7364 7365
      if (!my_tz_check_n_skip_implicit_tables(&table,
                                              lex->time_zone_tables_used) &&
          !table->table_in_first_from_clause)
7366 7367
      {
	if (check_access(thd, SELECT_ACL, table->db,
7368 7369
			 &table->grant.privilege, 0, 0,
                         test(table->schema_table)) ||
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bell@sanja.is.com.ua committed
7370
	    grant_option && check_grant(thd, SELECT_ACL, table, 0, 1, 0))
7371
	  DBUG_RETURN(TRUE);
7372 7373 7374 7375 7376 7377
      }
    }
  }

  if (select_lex->order_list.elements)
    msg= "ORDER BY";
7378
  else if (select_lex->select_limit)
7379 7380 7381 7382
    msg= "LIMIT";
  if (msg)
  {
    my_error(ER_WRONG_USAGE, MYF(0), "UPDATE", msg);
7383
    DBUG_RETURN(TRUE);
7384
  }
7385
  DBUG_RETURN(FALSE);
7386 7387 7388 7389 7390 7391 7392
}

/*
  Multi delete query pre-check

  SYNOPSIS
    multi_delete_precheck()
7393
    thd			Thread handler
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VIEW  
bell@sanja.is.com.ua committed
7394
    tables		Global/local table list
7395

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bell@sanja.is.com.ua committed
7396
  RETURN VALUE
7397 7398
    FALSE OK
    TRUE  error
7399
*/
7400

7401
bool multi_delete_precheck(THD *thd, TABLE_LIST *tables)
7402 7403 7404
{
  SELECT_LEX *select_lex= &thd->lex->select_lex;
  TABLE_LIST *aux_tables=
7405
    (TABLE_LIST *)thd->lex->auxiliary_table_list.first;
7406
  TABLE_LIST **save_query_tables_own_last= thd->lex->query_tables_own_last;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
7407
  DBUG_ENTER("multi_delete_precheck");
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7408

7409 7410
  /* sql_yacc guarantees that tables and aux_tables are not zero */
  DBUG_ASSERT(aux_tables != 0);
7411
  if (check_table_access(thd, SELECT_ACL, tables, 0))
7412 7413 7414 7415 7416 7417 7418 7419 7420 7421 7422
    DBUG_RETURN(TRUE);

  /*
    Since aux_tables list is not part of LEX::query_tables list we
    have to juggle with LEX::query_tables_own_last value to be able
    call check_table_access() safely.
  */
  thd->lex->query_tables_own_last= 0;
  if (check_table_access(thd, DELETE_ACL, aux_tables, 0))
  {
    thd->lex->query_tables_own_last= save_query_tables_own_last;
7423
    DBUG_RETURN(TRUE);
7424 7425 7426
  }
  thd->lex->query_tables_own_last= save_query_tables_own_last;

7427 7428
  if ((thd->options & OPTION_SAFE_UPDATES) && !select_lex->where)
  {
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bell@sanja.is.com.ua committed
7429 7430
    my_message(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE,
               ER(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE), MYF(0));
7431
    DBUG_RETURN(TRUE);
7432
  }
7433 7434 7435 7436 7437 7438 7439 7440 7441 7442 7443 7444 7445 7446 7447 7448 7449 7450 7451 7452 7453 7454 7455 7456 7457
  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;

7458
  for (target_tbl= (TABLE_LIST *)lex->auxiliary_table_list.first;
7459
       target_tbl; target_tbl= target_tbl->next_local)
7460
  {
7461
    lex->table_count++;
7462 7463
    /* All tables in aux_tables must be found in FROM PART */
    TABLE_LIST *walk;
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VIEW  
bell@sanja.is.com.ua committed
7464
    for (walk= tables; walk; walk= walk->next_local)
7465
    {
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bell@sanja.is.com.ua committed
7466 7467 7468
      if (!my_strcasecmp(table_alias_charset,
			 target_tbl->alias, walk->alias) &&
	  !strcmp(walk->db, target_tbl->db))
7469 7470 7471 7472
	break;
    }
    if (!walk)
    {
7473
      my_error(ER_UNKNOWN_TABLE, MYF(0),
7474
               target_tbl->table_name, "MULTI DELETE");
7475
      DBUG_RETURN(TRUE);
7476
    }
serg@serg.mylan's avatar
serg@serg.mylan committed
7477 7478 7479 7480 7481
    if (!walk->derived)
    {
      target_tbl->table_name= walk->table_name;
      target_tbl->table_name_length= walk->table_name_length;
    }
serg@serg.mylan's avatar
serg@serg.mylan committed
7482
    walk->updating= target_tbl->updating;
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bell@sanja.is.com.ua committed
7483
    walk->lock_type= target_tbl->lock_type;
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VIEW  
bell@sanja.is.com.ua committed
7484
    target_tbl->correspondent_table= walk;	// Remember corresponding table
7485
  }
7486
  DBUG_RETURN(FALSE);
7487 7488 7489
}


bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7490 7491 7492 7493 7494
/*
  simple UPDATE query pre-check

  SYNOPSIS
    update_precheck()
7495 7496
    thd		Thread handler
    tables	Global table list
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7497 7498

  RETURN VALUE
7499 7500
    FALSE OK
    TRUE  Error
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bell@sanja.is.com.ua committed
7501
*/
7502

7503
bool update_precheck(THD *thd, TABLE_LIST *tables)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7504 7505 7506 7507
{
  DBUG_ENTER("update_precheck");
  if (thd->lex->select_lex.item_list.elements != thd->lex->value_list.elements)
  {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7508
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
7509
    DBUG_RETURN(TRUE);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7510
  }
7511
  DBUG_RETURN(check_one_table_access(thd, UPDATE_ACL, tables));
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bell@sanja.is.com.ua committed
7512 7513 7514 7515 7516 7517 7518 7519
}


/*
  simple DELETE query pre-check

  SYNOPSIS
    delete_precheck()
7520 7521
    thd		Thread handler
    tables	Global table list
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7522 7523

  RETURN VALUE
7524 7525
    FALSE  OK
    TRUE   error
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bell@sanja.is.com.ua committed
7526
*/
7527

7528
bool delete_precheck(THD *thd, TABLE_LIST *tables)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7529 7530 7531
{
  DBUG_ENTER("delete_precheck");
  if (check_one_table_access(thd, DELETE_ACL, tables))
7532
    DBUG_RETURN(TRUE);
7533
  /* Set privilege for the WHERE clause */
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7534
  tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
7535
  DBUG_RETURN(FALSE);
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bell@sanja.is.com.ua committed
7536 7537 7538 7539 7540 7541 7542 7543
}


/*
  simple INSERT query pre-check

  SYNOPSIS
    insert_precheck()
7544 7545
    thd		Thread handler
    tables	Global table list
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7546 7547

  RETURN VALUE
7548 7549
    FALSE  OK
    TRUE   error
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bell@sanja.is.com.ua committed
7550
*/
7551

bell@sanja.is.com.ua's avatar
merge  
bell@sanja.is.com.ua committed
7552
bool insert_precheck(THD *thd, TABLE_LIST *tables)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7553 7554 7555 7556
{
  LEX *lex= thd->lex;
  DBUG_ENTER("insert_precheck");

7557 7558 7559 7560
  /*
    Check that we have modify privileges for the first table and
    select privileges for the rest
  */
monty@mysql.com's avatar
monty@mysql.com committed
7561 7562 7563
  ulong privilege= (INSERT_ACL |
                    (lex->duplicates == DUP_REPLACE ? DELETE_ACL : 0) |
                    (lex->value_list.elements ? UPDATE_ACL : 0));
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7564 7565

  if (check_one_table_access(thd, privilege, tables))
7566
    DBUG_RETURN(TRUE);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7567

7568
  if (lex->update_list.elements != lex->value_list.elements)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7569
  {
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bell@sanja.is.com.ua committed
7570
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
7571
    DBUG_RETURN(TRUE);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7572
  }
7573
  DBUG_RETURN(FALSE);
7574
}
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bell@sanja.is.com.ua committed
7575 7576 7577 7578 7579 7580 7581


/*
  CREATE TABLE query pre-check

  SYNOPSIS
    create_table_precheck()
7582 7583 7584
    thd			Thread handler
    tables		Global table list
    create_table	Table which will be created
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7585 7586

  RETURN VALUE
7587 7588
    FALSE   OK
    TRUE   Error
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bell@sanja.is.com.ua committed
7589
*/
7590

7591 7592
bool create_table_precheck(THD *thd, TABLE_LIST *tables,
                           TABLE_LIST *create_table)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7593 7594
{
  LEX *lex= thd->lex;
7595 7596
  SELECT_LEX *select_lex= &lex->select_lex;
  ulong want_priv;
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merge  
bell@sanja.is.com.ua committed
7597
  bool error= TRUE;                                 // Error message is given
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bell@sanja.is.com.ua committed
7598
  DBUG_ENTER("create_table_precheck");
7599 7600 7601

  want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
              CREATE_TMP_ACL : CREATE_ACL);
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bell@sanja.is.com.ua committed
7602 7603
  lex->create_info.alias= create_table->alias;
  if (check_access(thd, want_priv, create_table->db,
7604 7605
		   &create_table->grant.privilege, 0, 0,
                   test(create_table->schema_table)) ||
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bell@sanja.is.com.ua committed
7606 7607 7608
      check_merge_table_access(thd, create_table->db,
			       (TABLE_LIST *)
			       lex->create_info.merge_list.first))
7609 7610
    goto err;
  if (grant_option && want_priv != CREATE_TMP_ACL &&
7611
      check_grant(thd, want_priv, create_table, 0, 1, 0))
7612 7613 7614 7615 7616 7617
    goto err;

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

7618 7619
#ifdef NOT_NECESSARY_TO_CHECK_CREATE_TABLE_EXIST_WHEN_PREPARING_STATEMENT
    /* This code throws an ill error for CREATE TABLE t1 SELECT * FROM t1 */
7620
    /*
monty@mysql.com's avatar
monty@mysql.com committed
7621 7622 7623
      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).
7624
    */
konstantin@mysql.com's avatar
konstantin@mysql.com committed
7625
    if (thd->stmt_arena->is_stmt_prepare_or_first_sp_execute())
7626
    {
monty@mysql.com's avatar
monty@mysql.com committed
7627 7628 7629 7630
      /*
        For temporary tables we don't have to check if the created table exists
      */
      if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
monty@mysql.com's avatar
monty@mysql.com committed
7631
          find_table_in_global_list(tables, create_table->db,
7632
                                    create_table->table_name))
monty@mysql.com's avatar
monty@mysql.com committed
7633
      {
7634
	error= FALSE;
monty@mysql.com's avatar
monty@mysql.com committed
7635 7636 7637
        goto err;
      }
    }
7638
#endif
7639 7640 7641
    if (tables && check_table_access(thd, SELECT_ACL, tables,0))
      goto err;
  }
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merge  
bell@sanja.is.com.ua committed
7642
  error= FALSE;
7643 7644 7645

err:
  DBUG_RETURN(error);
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bell@sanja.is.com.ua committed
7646
}
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bell@sanja.is.com.ua committed
7647 7648 7649 7650 7651 7652 7653


/*
  negate given expression

  SYNOPSIS
    negate_expression()
7654
    thd  thread handler
bell@sanja.is.com.ua's avatar
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7655 7656 7657 7658 7659 7660 7661 7662 7663 7664 7665 7666 7667 7668 7669 7670 7671 7672 7673 7674 7675 7676 7677 7678 7679 7680 7681 7682
    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);
}
7683

7684 7685
/*
  Set the specified definer to the default value, which is the current user in
7686
  the thread.
7687 7688 7689 7690 7691 7692 7693
 
  SYNOPSIS
    get_default_definer()
    thd       [in] thread handler
    definer   [out] definer
*/
 
7694
void get_default_definer(THD *thd, LEX_USER *definer)
7695 7696 7697 7698 7699 7700 7701 7702 7703 7704
{
  const Security_context *sctx= thd->security_ctx;

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

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

7705

7706
/*
7707
  Create default definer for the specified THD.
7708 7709 7710 7711 7712 7713 7714 7715 7716 7717 7718 7719 7720 7721 7722 7723 7724 7725

  SYNOPSIS
    create_default_definer()
    thd         [in] thread handler

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

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

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

7726
  get_default_definer(thd, definer);
7727 7728 7729 7730 7731

  return definer;
}


7732
/*
7733
  Create definer with the given user and host names.
7734 7735

  SYNOPSIS
7736 7737 7738 7739
    create_definer()
    thd         [in] thread handler
    user_name   [in] user name
    host_name   [in] host name
7740 7741

  RETURN
7742
    On success, return a valid pointer to the created and initialized
7743
    LEX_USER, which contains definer information.
7744
    On error, return 0.
7745 7746
*/

7747
LEX_USER *create_definer(THD *thd, LEX_STRING *user_name, LEX_STRING *host_name)
7748
{
7749 7750 7751 7752
  LEX_USER *definer;

  /* Create and initialize. */

7753
  if (! (definer= (LEX_USER*) thd->alloc(sizeof(LEX_USER))))
7754 7755 7756 7757 7758 7759
    return 0;

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

  return definer;
7760
}
7761 7762 7763 7764 7765 7766 7767 7768 7769 7770 7771 7772 7773 7774 7775 7776 7777 7778 7779


/*
  Retuns information about user or current user.

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

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

LEX_USER *get_current_user(THD *thd, LEX_USER *user)
{
  if (!user->user.str)  // current_user
7780 7781
    return create_default_definer(thd);

7782 7783
  return user;
}
7784 7785 7786 7787 7788 7789 7790 7791 7792 7793 7794 7795 7796 7797 7798 7799


/*
  Check that length of a string does not exceed some limit.

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

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

7800 7801
bool check_string_length(LEX_STRING *str, const char *err_msg,
                         uint max_length)
7802
{
7803 7804
  if (str->length <= max_length)
    return FALSE;
7805 7806

  my_error(ER_WRONG_STRING_LENGTH, MYF(0), str->str, err_msg, max_length);
7807

7808 7809
  return TRUE;
}