sql_parse.cc 209 KB
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/* Copyright (C) 2000-2003 MySQL AB
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   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; version 2 of the License.
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   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

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#define MYSQL_LEX 1
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#include "mysql_priv.h"
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#include "sql_repl.h"
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#include "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 "sql_trigger.h"
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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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static bool execute_sqlcom_select(THD *thd, TABLE_LIST *all_tables);
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static bool check_show_create_table_access(THD *thd, TABLE_LIST *table);
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const char *any_db="*any*";	// Special symbol for check_access
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const LEX_STRING command_name[]={
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  { 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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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_KEEP_LOG);
  thd->no_trans_update.all= FALSE;
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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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/*
  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((uchar*) &sql_command_flags, sizeof(sql_command_flags));
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  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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void execute_init_command(THD *thd, sys_var_str *init_command_var,
			  rw_lock_t *var_mutex)
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{
  Vio* save_vio;
  ulong save_client_capabilities;

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


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

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#ifndef EMBEDDED_LIBRARY
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  pthread_detach_this_thread();
  thd->thread_stack= (char*) &thd;
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#endif /* EMBEDDED_LIBRARY */
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  if (thd->variables.max_join_size == HA_POS_ERROR)
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    thd->options |= OPTION_BIG_SELECTS;

  thd->proc_info=0;
  thd->version=refresh_version;
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  thd->security_ctx->priv_user=
    thd->security_ctx->user= (char*) my_strdup("boot", MYF(MY_WME));
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  thd->security_ctx->priv_host[0]=0;
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  /*
    Make the "client" handle multiple results. This is necessary
    to enable stored procedures with SELECTs and Dynamic SQL
    in init-file.
  */
  thd->client_capabilities|= CLIENT_MULTI_RESULTS;
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  buff= (char*) thd->net.buff;
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  thd->init_for_queries();
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  while (fgets(buff, thd->net.max_packet, file))
  {
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    /* strlen() can't be deleted because fgets() doesn't return length */
    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.
      */
      /* purecov: begin tested */
      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);
      /* purecov: end */
    }
    if (thd->is_fatal_error)
      break;                                    /* purecov: inspected */
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    while (length && (my_isspace(thd->charset(), buff[length-1]) ||
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                      buff[length-1] == ';'))
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      length--;
    buff[length]=0;
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    /* Skip lines starting with delimiter */
    if (strncmp(buff, STRING_WITH_LEN("delimiter")) == 0)
      continue;

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    thd->query_length=length;
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    thd->query= (char*) thd->memdup_w_gap(buff, length+1, 
                                          thd->db_length+1+
                                          QUERY_CACHE_FLAGS_SIZE);
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    thd->query[length] = '\0';
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    DBUG_PRINT("query",("%-.4096s",thd->query));
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    /*
      We don't need to obtain LOCK_thread_count here because in bootstrap
      mode we have only one thread.
    */
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    thd->query_id=next_query_id();
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    thd->set_time();
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    mysql_parse(thd, thd->query, length, & found_semicolon);
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    close_thread_tables(thd);			// Free tables
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    if (thd->is_fatal_error)
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      break;
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    if (thd->net.report_error)
    {
      /* The query failed, send error to log and abort bootstrap */
      net_send_error(thd);
      thd->fatal_error();
      break;
    }

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    free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));
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#ifdef USING_TRANSACTIONS
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    free_root(&thd->transaction.mem_root,MYF(MY_KEEP_PREALLOC));
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#endif
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  }
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end:
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  /* Remember the exit code of bootstrap */
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  bootstrap_error= thd->is_fatal_error;

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

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


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

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

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

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

  SYNOPSIS
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    end_trans()
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      thd            Current thread
      completion     Completion type

  RETURN
    0 - OK
*/

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int end_trans(THD *thd, enum enum_mysql_completiontype completion)
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{
  bool do_release= 0;
  int res= 0;
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  DBUG_ENTER("end_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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  switch (completion) {
  case COMMIT:
    /*
     We don't use end_active_trans() here to ensure that this works
     even if there is a problem with the OPTION_AUTO_COMMIT flag
     (Which of course should never happen...)
    */
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
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    res= ha_commit(thd);
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    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_KEEP_LOG);
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    thd->no_trans_update.all= FALSE;
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    break;
  case COMMIT_RELEASE:
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    do_release= 1; /* fall through */
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  case COMMIT_AND_CHAIN:
    res= end_active_trans(thd);
    if (!res && completion == COMMIT_AND_CHAIN)
      res= begin_trans(thd);
    break;
  case ROLLBACK_RELEASE:
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    do_release= 1; /* fall through */
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  case ROLLBACK:
  case ROLLBACK_AND_CHAIN:
  {
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
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    if (ha_rollback(thd))
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      res= -1;
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    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_KEEP_LOG);
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    thd->no_trans_update.all= FALSE;
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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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  if (res < 0)
    my_error(thd->killed_errno(), MYF(0));
  else if ((res == 0) && do_release)
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    thd->killed= THD::KILL_CONNECTION;

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

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

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

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

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

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  if (thd->killed == THD::KILL_QUERY || thd->killed == THD::KILL_BAD_DATA)
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  {
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    thd->killed= THD::NOT_KILLED;
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    thd->mysys_var->abort= 0;
  }
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  thd->command=command;
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  /*
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    Commands which always take a long time are logged into
    the slow log only if opt_log_slow_admin_statements is set.
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  */
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  thd->enable_slow_log= TRUE;
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  thd->lex->sql_command= SQLCOM_END; /* to avoid confusing VIEW detectors */
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  thd->set_time();
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  VOID(pthread_mutex_lock(&LOCK_thread_count));
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  thd->query_id= global_query_id;
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  if (command != COM_STATISTICS && command != COM_PING)
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    next_query_id();
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  thread_running++;
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  /* TODO: set thd->lex->sql_command to SQLCOM_END here */
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  VOID(pthread_mutex_unlock(&LOCK_thread_count));
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  thd->server_status&=
           ~(SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED);
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  switch (command) {
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  case COM_INIT_DB:
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  {
    LEX_STRING tmp;
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    status_var_increment(thd->status_var.com_stat[SQLCOM_CHANGE_DB]);
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    thd->convert_string(&tmp, system_charset_info,
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			packet, packet_length-1, thd->charset());
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    if (!mysql_change_db(thd, &tmp, FALSE))
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    {
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      general_log_print(thd, command, "%s",thd->db);
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      send_ok(thd);
    }
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    break;
  }
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#ifdef HAVE_REPLICATION
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  case COM_REGISTER_SLAVE:
  {
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    if (!register_slave(thd, (uchar*)packet, packet_length))
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      send_ok(thd);
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    break;
  }
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#endif
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  case COM_TABLE_DUMP:
745
  {
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    char *tbl_name;
    LEX_STRING db;
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    uint db_len= *(uchar*) packet;
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    if (db_len >= packet_length || db_len > NAME_LEN)
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    {
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      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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      break;
    }
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    uint tbl_len= *(uchar*) (packet + db_len + 1);
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    if (db_len+tbl_len+2 > packet_length || tbl_len > NAME_LEN)
    {
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      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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      break;
    }
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    status_var_increment(thd->status_var.com_other);
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    thd->enable_slow_log= opt_log_slow_admin_statements;
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    db.str= (char*) thd->alloc(db_len + tbl_len + 2);
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    if (!db.str)
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    {
      my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
      break;
    }
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    db.length= db_len;
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    tbl_name= strmake(db.str, packet + 1, db_len)+1;
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    strmake(tbl_name, packet + db_len + 2, tbl_len);
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    mysql_table_dump(thd, &db, tbl_name);
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    break;
  }
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  case COM_CHANGE_USER:
  {
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    status_var_increment(thd->status_var.com_other);
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    char *user= (char*) packet, *packet_end= packet+ packet_length;
    char *passwd= strend(user)+1;

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    thd->change_user();
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    thd->clear_error();                         // if errors from rollback
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    /*
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      Old clients send null-terminated string ('\0' for empty string) for
      password.  New clients send the size (1 byte) + string (not null
      terminated, so also '\0' for empty string).
    */
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    char db_buff[NAME_LEN+1];                 // buffer to store db in utf8
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    char *db= passwd;
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    char *save_db;
    uint passwd_len= (thd->client_capabilities & CLIENT_SECURE_CONNECTION ?
                      *passwd++ : strlen(passwd));
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    uint dummy_errors, save_db_length, db_length;
    int res;
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    Security_context save_security_ctx= *thd->security_ctx;
    USER_CONN *save_user_connect;

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    db+= passwd_len + 1;
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#ifndef EMBEDDED_LIBRARY
801
    /* Small check for incoming packet */
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    if ((uint) ((uchar*) db - net->read_pos) > packet_length)
803
    {
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      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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      break;
    }
807
#endif
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    /* Convert database name to utf8 */
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    /*
      Handle problem with old bug in client protocol where db had an extra
      \0
    */
    db_length= (packet_end - db);
    if (db_length > 0 && db[db_length-1] == 0)
      db_length--;
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    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
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                             system_charset_info, db, db_length,
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                             thd->charset(), &dummy_errors)]= 0;
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    db= db_buff;
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    /* Save user and privileges */
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    save_db_length= thd->db_length;
    save_db= thd->db;
    save_user_connect= thd->user_connect;
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    if (!(thd->security_ctx->user= my_strdup(user, MYF(0))))
827
    {
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      thd->security_ctx->user= save_security_ctx.user;
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      my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
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      break;
    }
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    /* Clear variables that are allocated */
    thd->user_connect= 0;
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    res= check_user(thd, COM_CHANGE_USER, passwd, passwd_len, db, FALSE);
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837 838
    if (res)
    {
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      /* authentication failure, we shall restore old user */
840
      if (res > 0)
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        my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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      else
        thd->clear_error();                     // Error already sent to client
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      x_free(thd->security_ctx->user);
      *thd->security_ctx= save_security_ctx;
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      thd->user_connect= save_user_connect;
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      thd->db= save_db;
      thd->db_length= save_db_length;
    }
    else
    {
852
#ifndef NO_EMBEDDED_ACCESS_CHECKS
853
      /* we've authenticated new user */
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      if (save_user_connect)
	decrease_user_connections(save_user_connect);
856
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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      x_free((uchar*) save_db);
      x_free((uchar*)  save_security_ctx.user);
859
    }
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    break;
  }
862
  case COM_STMT_EXECUTE:
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  {
864
    mysql_stmt_execute(thd, packet, packet_length);
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    break;
  }
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  case COM_STMT_FETCH:
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  {
    mysql_stmt_fetch(thd, packet, packet_length);
    break;
  }
872
  case COM_STMT_SEND_LONG_DATA:
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  {
874
    mysql_stmt_get_longdata(thd, packet, packet_length);
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    break;
  }
877
  case COM_STMT_PREPARE:
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  {
879
    mysql_stmt_prepare(thd, packet, packet_length);
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    break;
  }
882
  case COM_STMT_CLOSE:
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  {
884
    mysql_stmt_close(thd, packet);
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    break;
  }
887
  case COM_STMT_RESET:
888 889 890 891
  {
    mysql_stmt_reset(thd, packet);
    break;
  }
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  case COM_QUERY:
  {
894 895
    if (alloc_query(thd, packet, packet_length))
      break;					// fatal error is set
896
    char *packet_end= thd->query + thd->query_length;
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    /* 'b' stands for 'buffer' parameter', special for 'my_snprintf' */
    const char *format= "%.*b";
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    const char* found_semicolon= NULL;

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    general_log_print(thd, command, format, thd->query_length, thd->query);
902
    DBUG_PRINT("query",("%-.4096s",thd->query));
903 904 905 906

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

907
    mysql_parse(thd, thd->query, thd->query_length, & found_semicolon);
908

909
    while (!thd->killed && found_semicolon && !thd->net.report_error)
910
    {
911
      char *next_packet= (char*) found_semicolon;
912
      net->no_send_error= 0;
913
      /*
914 915
        Multiple queries exits, execute them individually
      */
916 917
      if (thd->lock || thd->open_tables || thd->derived_tables ||
          thd->prelocked_mode)
918
        close_thread_tables(thd);
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      ulong length= (ulong)(packet_end - next_packet);
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921
      log_slow_statement(thd);
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      /* Remove garbage at start of query */
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      while (my_isspace(thd->charset(), *next_packet) && length > 0)
925
      {
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        next_packet++;
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        length--;
      }
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      VOID(pthread_mutex_lock(&LOCK_thread_count));
930
      thd->query_length= length;
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      thd->query= next_packet;
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      thd->query_id= next_query_id();
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      thd->set_time(); /* Reset the query start time. */
934
      /* TODO: set thd->lex->sql_command to SQLCOM_END here */
935
      VOID(pthread_mutex_unlock(&LOCK_thread_count));
936
      mysql_parse(thd, next_packet, length, & found_semicolon);
937 938
    }

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    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),WAIT_PRIOR);
    DBUG_PRINT("info",("query ready"));
    break;
  }
944
  case COM_FIELD_LIST:				// This isn't actually needed
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#ifdef DONT_ALLOW_SHOW_COMMANDS
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    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0));	/* purecov: inspected */
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    break;
#else
  {
951
    char *fields, *packet_end= packet + packet_length - 1, *arg_end;
952
    /* Locked closure of all tables */
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    TABLE_LIST table_list;
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    LEX_STRING conv_name;
955
    size_t dummy;
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    /* used as fields initializator */
958
    lex_start(thd);
959

960
    status_var_increment(thd->status_var.com_stat[SQLCOM_SHOW_FIELDS]);
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    bzero((char*) &table_list,sizeof(table_list));
962
    if (thd->copy_db_to(&table_list.db, &dummy))
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      break;
964 965 966 967
    /*
      We have name + wildcard in packet, separated by endzero
    */
    arg_end= strend(packet);
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    thd->convert_string(&conv_name, system_charset_info,
969
			packet, (uint) (arg_end - packet), thd->charset());
970
    table_list.alias= table_list.table_name= conv_name.str;
971
    packet= arg_end + 1;
972 973

    if (!my_strcasecmp(system_charset_info, table_list.db,
974
                       INFORMATION_SCHEMA_NAME.str))
975 976 977 978 979 980
    {
      ST_SCHEMA_TABLE *schema_table= find_schema_table(thd, table_list.alias);
      if (schema_table)
        table_list.schema_table= schema_table;
    }

981
    thd->query_length= (uint) (packet_end - packet); // Don't count end \0
982
    if (!(thd->query=fields= (char*) thd->memdup(packet,thd->query_length+1)))
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      break;
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    general_log_print(thd, command, "%s %s", table_list.table_name, fields);
985
    if (lower_case_table_names)
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      my_casedn_str(files_charset_info, table_list.table_name);
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    if (check_access(thd,SELECT_ACL,table_list.db,&table_list.grant.privilege,
989
		     0, 0, test(table_list.schema_table)))
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      break;
991
    if (check_grant(thd, SELECT_ACL, &table_list, 2, UINT_MAX, 0))
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      break;
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    /* init structures for VIEW processing */
    table_list.select_lex= &(thd->lex->select_lex);
995 996 997 998

    lex_start(thd);
    mysql_reset_thd_for_next_command(thd);

999
    thd->lex->
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      select_lex.table_list.link_in_list((uchar*) &table_list,
                                         (uchar**) &table_list.next_local);
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    thd->lex->add_to_query_tables(&table_list);
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1004 1005
    /* switch on VIEW optimisation: do not fill temporary tables */
    thd->lex->sql_command= SQLCOM_SHOW_FIELDS;
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    mysqld_list_fields(thd,&table_list,fields);
1007
    thd->lex->unit.cleanup();
1008
    thd->cleanup_after_query();
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    break;
  }
#endif
  case COM_QUIT:
1013
    /* We don't calculate statistics for this command */
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    general_log_print(thd, command, NullS);
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    net->error=0;				// Don't give 'abort' message
    error=TRUE;					// End server
    break;

1019
#ifdef REMOVED
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  case COM_CREATE_DB:				// QQ: To be removed
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    {
1022
      LEX_STRING db, alias;
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      HA_CREATE_INFO create_info;
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1025
      status_var_increment(thd->status_var.com_stat[SQLCOM_CREATE_DB]);
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      if (thd->LEX_STRING_make(&db, packet, packet_length -1) ||
          thd->LEX_STRING_make(&alias, db.str, db.length) ||
          check_db_name(&db))
1029
      {
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	my_error(ER_WRONG_DB_NAME, MYF(0), db.str ? db.str : "NULL");
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	break;
      }
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      if (check_access(thd, CREATE_ACL, db.str , 0, 1, 0,
                       is_schema_db(db.str)))
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	break;
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      general_log_print(thd, command, packet);
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      bzero(&create_info, sizeof(create_info));
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      mysql_create_db(thd, (lower_case_table_names == 2 ? alias.str : db.str),
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                      &create_info, 0);
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      break;
    }
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  case COM_DROP_DB:				// QQ: To be removed
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    {
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      status_var_increment(thd->status_var.com_stat[SQLCOM_DROP_DB]);
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      LEX_STRING db;

      if (thd->LEX_STRING_make(&db, packet, packet_length - 1) ||
          check_db_name(&db))
1049
      {
1050
	my_error(ER_WRONG_DB_NAME, MYF(0), db.str ? db.str : "NULL");
1051 1052
	break;
      }
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      if (check_access(thd, DROP_ACL, db.str, 0, 1, 0, is_schema_db(db.str)))
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	break;
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      if (thd->locked_tables || thd->active_transaction())
      {
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	my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                   ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
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	break;
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      }
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      general_log_print(thd, command, db.str);
      mysql_rm_db(thd, db.str, 0, 0);
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      break;
    }
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#endif
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#ifndef EMBEDDED_LIBRARY
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  case COM_BINLOG_DUMP:
    {
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      ulong pos;
      ushort flags;
      uint32 slave_server_id;

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      status_var_increment(thd->status_var.com_other);
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      thd->enable_slow_log= opt_log_slow_admin_statements;
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      if (check_global_access(thd, REPL_SLAVE_ACL))
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	break;
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      /* TODO: The following has to be changed to an 8 byte integer */
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      pos = uint4korr(packet);
      flags = uint2korr(packet + 4);
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      thd->server_id=0; /* avoid suicide */
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      if ((slave_server_id= uint4korr(packet+6))) // mysqlbinlog.server_id==0
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	kill_zombie_dump_threads(slave_server_id);
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      thd->server_id = slave_server_id;
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      general_log_print(thd, command, "Log: '%s'  Pos: %ld", packet+10,
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                      (long) pos);
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      mysql_binlog_send(thd, thd->strdup(packet + 10), (my_off_t) pos, flags);
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      unregister_slave(thd,1,1);
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      /*  fake COM_QUIT -- if we get here, the thread needs to terminate */
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      error = TRUE;
      net->error = 0;
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      break;
    }
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#endif
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  case COM_REFRESH:
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  {
    bool not_used;
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    status_var_increment(thd->status_var.com_stat[SQLCOM_FLUSH]);
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    ulong options= (ulong) (uchar) packet[0];
    if (check_global_access(thd,RELOAD_ACL))
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      break;
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    general_log_print(thd, command, NullS);
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    if (!reload_acl_and_cache(thd, options, (TABLE_LIST*) 0, &not_used))
      send_ok(thd);
    break;
  }
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#ifndef EMBEDDED_LIBRARY
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  case COM_SHUTDOWN:
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  {
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    status_var_increment(thd->status_var.com_other);
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    if (check_global_access(thd,SHUTDOWN_ACL))
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      break; /* purecov: inspected */
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    /*
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      If the client is < 4.1.3, it is going to send us no argument; then
      packet_length is 1, packet[0] is the end 0 of the packet. Note that
      SHUTDOWN_DEFAULT is 0. If client is >= 4.1.3, the shutdown level is in
      packet[0].
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    */
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    enum mysql_enum_shutdown_level level=
      (enum mysql_enum_shutdown_level) (uchar) packet[0];
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    if (level == SHUTDOWN_DEFAULT)
      level= SHUTDOWN_WAIT_ALL_BUFFERS; // soon default will be configurable
    else if (level != SHUTDOWN_WAIT_ALL_BUFFERS)
    {
      my_error(ER_NOT_SUPPORTED_YET, MYF(0), "this shutdown level");
      break;
    }
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    DBUG_PRINT("quit",("Got shutdown command for level %u", level));
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    general_log_print(thd, command, NullS);
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    send_eof(thd);
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#ifdef __WIN__
    sleep(1);					// must wait after eof()
#endif
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    /*
      The client is next going to send a COM_QUIT request (as part of
      mysql_close()). Make the life simpler for the client by sending
      the response for the coming COM_QUIT in advance
    */
    send_eof(thd);
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    close_connection(thd, 0, 1);
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    close_thread_tables(thd);			// Free before kill
    kill_mysql();
    error=TRUE;
    break;
1146
  }
1147
#endif
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  case COM_STATISTICS:
  {
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    STATUS_VAR current_global_status_var;
    ulong uptime;
    uint length;
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    ulonglong queries_per_second1000;
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#ifndef EMBEDDED_LIBRARY
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    char buff[250];
    uint buff_len= sizeof(buff);
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#else
    char *buff= thd->net.last_error;
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    uint buff_len= sizeof(thd->net.last_error);
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#endif
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    general_log_print(thd, command, NullS);
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    status_var_increment(thd->status_var.com_stat[SQLCOM_SHOW_STATUS]);
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    calc_sum_of_all_status(&current_global_status_var);
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    if (!(uptime= (ulong) (thd->start_time - server_start_time)))
      queries_per_second1000= 0;
    else
      queries_per_second1000= thd->query_id * LL(1000) / uptime;

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    length= my_snprintf((char*) buff, buff_len - 1,
                        "Uptime: %lu  Threads: %d  Questions: %lu  "
                        "Slow queries: %lu  Opens: %lu  Flush tables: %lu  "
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                        "Open tables: %u  Queries per second avg: %u.%u",
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                        uptime,
                        (int) thread_count, (ulong) thd->query_id,
                        current_global_status_var.long_query_count,
                        current_global_status_var.opened_tables,
                        refresh_version,
                        cached_open_tables(),
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                        (uint) (queries_per_second1000 / 1000),
                        (uint) (queries_per_second1000 % 1000));
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#ifdef SAFEMALLOC
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    if (sf_malloc_cur_memory)				// Using SAFEMALLOC
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    {
      char *end= buff + length;
      length+= my_snprintf(end, buff_len - length - 1,
                           end,"  Memory in use: %ldK  Max memory used: %ldK",
                           (sf_malloc_cur_memory+1023L)/1024L,
                           (sf_malloc_max_memory+1023L)/1024L);
    }
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#endif
#ifndef EMBEDDED_LIBRARY
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    VOID(my_net_write(net, (uchar*) buff, length));
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      VOID(net_flush(net));
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#endif
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    break;
  }
  case COM_PING:
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    status_var_increment(thd->status_var.com_other);
1200
    send_ok(thd);				// Tell client we are alive
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    break;
  case COM_PROCESS_INFO:
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    status_var_increment(thd->status_var.com_stat[SQLCOM_SHOW_PROCESSLIST]);
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    if (!thd->security_ctx->priv_user[0] &&
        check_global_access(thd, PROCESS_ACL))
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      break;
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    general_log_print(thd, command, NullS);
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    mysqld_list_processes(thd,
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			  thd->security_ctx->master_access & PROCESS_ACL ? 
			  NullS : thd->security_ctx->priv_user, 0);
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    break;
  case COM_PROCESS_KILL:
  {
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    status_var_increment(thd->status_var.com_stat[SQLCOM_KILL]);
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    ulong id=(ulong) uint4korr(packet);
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    sql_kill(thd,id,false);
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    break;
  }
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  case COM_SET_OPTION:
  {
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    status_var_increment(thd->status_var.com_stat[SQLCOM_SET_OPTION]);
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    uint opt_command= uint2korr(packet);

    switch (opt_command) {
    case (int) MYSQL_OPTION_MULTI_STATEMENTS_ON:
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      thd->client_capabilities|= CLIENT_MULTI_STATEMENTS;
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      send_eof(thd);
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      break;
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    case (int) MYSQL_OPTION_MULTI_STATEMENTS_OFF:
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      thd->client_capabilities&= ~CLIENT_MULTI_STATEMENTS;
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      send_eof(thd);
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      break;
    default:
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      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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      break;
    }
    break;
  }
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  case COM_DEBUG:
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    status_var_increment(thd->status_var.com_other);
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    if (check_global_access(thd, SUPER_ACL))
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      break;					/* purecov: inspected */
1243
    mysql_print_status();
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    general_log_print(thd, command, NullS);
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    send_eof(thd);
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    break;
  case COM_SLEEP:
  case COM_CONNECT:				// Impossible here
  case COM_TIME:				// Impossible from client
  case COM_DELAYED_INSERT:
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  case COM_END:
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  default:
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    my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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    break;
  }
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  if (thd->lock || thd->open_tables || thd->derived_tables ||
      thd->prelocked_mode)
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  {
    thd->proc_info="closing tables";
    close_thread_tables(thd);			/* Free tables */
  }
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  /*
    assume handlers auto-commit (if some doesn't - transaction handling
    in MySQL should be redesigned to support it; it's a big change,
    and it's not worth it - better to commit explicitly only writing
    transactions, read-only ones should better take care of themselves.
    saves some work in 2pc too)
    see also sql_base.cc - close_thread_tables()
  */
  bzero(&thd->transaction.stmt, sizeof(thd->transaction.stmt));
  if (!thd->active_transaction())
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    thd->transaction.xid_state.xid.null();
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  /* report error issued during command execution */
  if (thd->killed_errno() && !thd->net.report_error)
    thd->send_kill_message();
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  if (thd->net.report_error)
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    net_send_error(thd);
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1280
  log_slow_statement(thd);
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  thd->proc_info="cleaning up";
  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For process list
  thd->proc_info=0;
  thd->command=COM_SLEEP;
  thd->query=0;
  thd->query_length=0;
  thread_running--;
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
  thd->packet.shrink(thd->variables.net_buffer_length);	// Reclaim some memory
  free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));
  DBUG_RETURN(error);
}


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void log_slow_statement(THD *thd)
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{
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  time_t start_of_query;
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  DBUG_ENTER("log_slow_statement");
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  /*
    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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    DBUG_VOID_RETURN;                           // Don't set time for sub stmt
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  start_of_query= thd->start_time;
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  thd->end_time();				// Set start time
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  /*
    Do not log administrative statements unless the appropriate option is
    set; do not log into slow log if reading from backup.
  */
  if (thd->enable_slow_log && !thd->user_time)
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  {
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    thd->proc_info="logging slow query";

1320 1321
    if ((ulong) (thd->start_time - thd->time_after_lock) >
	thd->variables.long_query_time ||
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	((thd->server_status &
	  (SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED)) &&
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	 (specialflag & SPECIAL_LOG_QUERIES_NOT_USING_INDEXES)))
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    {
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      thd->status_var.long_query_count++;
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      slow_log_print(thd, thd->query, thd->query_length, start_of_query);
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    }
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  }
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  DBUG_VOID_RETURN;
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}

1333

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/*
  Create a TABLE_LIST object for an INFORMATION_SCHEMA table.

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

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

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

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

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int prepare_schema_table(THD *thd, LEX *lex, Table_ident *table_ident,
                         enum enum_schema_tables schema_table_idx)
{
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  SELECT_LEX *schema_select_lex= NULL;
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  DBUG_ENTER("prepare_schema_table");
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1368
  switch (schema_table_idx) {
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  case SCH_SCHEMATA:
#if defined(DONT_ALLOW_SHOW_COMMANDS)
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    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0));   /* purecov: inspected */
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    DBUG_RETURN(1);
#else
    break;
#endif
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  case SCH_TABLE_NAMES:
  case SCH_TABLES:
  case SCH_VIEWS:
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  case SCH_TRIGGERS:
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  case SCH_EVENTS:
1383
#ifdef DONT_ALLOW_SHOW_COMMANDS
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    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */
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    DBUG_RETURN(1);
#else
    {
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      LEX_STRING db;
1390
      size_t dummy;
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      if (lex->select_lex.db == NULL &&
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          thd->copy_db_to(&lex->select_lex.db, &dummy))
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      {
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        DBUG_RETURN(1);
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      }
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      schema_select_lex= new SELECT_LEX();
      db.str= schema_select_lex->db= lex->select_lex.db;
      schema_select_lex->table_list.first= NULL;
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      db.length= strlen(db.str);
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      if (check_db_name(&db))
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      {
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        my_error(ER_WRONG_DB_NAME, MYF(0), db.str);
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        DBUG_RETURN(1);
      }
      break;
    }
#endif
  case SCH_COLUMNS:
  case SCH_STATISTICS:
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  {
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#ifdef DONT_ALLOW_SHOW_COMMANDS
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    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */
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    DBUG_RETURN(1);
#else
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    DBUG_ASSERT(table_ident);
    TABLE_LIST **query_tables_last= lex->query_tables_last;
    schema_select_lex= new SELECT_LEX();
    /* 'parent_lex' is used in init_query() so it must be before it. */
    schema_select_lex->parent_lex= lex;
    schema_select_lex->init_query();
    if (!schema_select_lex->add_table_to_list(thd, table_ident, 0, 0, TL_READ))
      DBUG_RETURN(1);
    lex->query_tables_last= query_tables_last;
    break;
  }
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#endif
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  case SCH_OPEN_TABLES:
  case SCH_VARIABLES:
  case SCH_STATUS:
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  case SCH_PROCEDURES:
  case SCH_CHARSETS:
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  case SCH_ENGINES:
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  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;
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  table_list->schema_select_lex= schema_select_lex;
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  table_list->schema_table_reformed= 1;
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  DBUG_RETURN(0);
}


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/*
  Read query from packet and store in thd->query
1461
  Used in COM_QUERY and COM_STMT_PREPARE
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  DESCRIPTION
    Sets the following THD variables:
      query
      query_length

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

1473
bool alloc_query(THD *thd, const char *packet, uint packet_length)
1474 1475
{
  packet_length--;				// Remove end null
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  /* Remove garbage at start and end of query */
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  while (my_isspace(thd->charset(),packet[0]) && packet_length > 0)
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  {
    packet++;
    packet_length--;
  }
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  const char *pos= packet + packet_length;     // Point at end null
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  while (packet_length > 0 &&
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	 (pos[-1] == ';' || my_isspace(thd->charset() ,pos[-1])))
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  {
    pos--;
    packet_length--;
  }
  /* We must allocate some extra memory for query cache */
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  thd->query_length= 0;                        // Extra safety: Avoid races
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  if (!(thd->query= (char*) thd->memdup_w_gap((uchar*) (packet),
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					      packet_length,
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					      thd->db_length+ 1 +
					      QUERY_CACHE_FLAGS_SIZE)))
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    return TRUE;
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  thd->query[packet_length]=0;
  thd->query_length= packet_length;
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  /* Reclaim some memory */
  thd->packet.shrink(thd->variables.net_buffer_length);
  thd->convert_buffer.shrink(thd->variables.net_buffer_length);
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  return FALSE;
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}

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

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static
bool sp_process_definer(THD *thd)
{
  DBUG_ENTER("sp_process_definer");

  LEX *lex= thd->lex;

  /*
    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)
  {
    Query_arena original_arena;
    Query_arena *ps_arena= thd->activate_stmt_arena_if_needed(&original_arena);

    lex->definer= create_default_definer(thd);

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

    /* Error has been already reported. */
    if (lex->definer == NULL)
      DBUG_RETURN(TRUE);

    if (thd->slave_thread)
      lex->sphead->m_chistics->suid= SP_IS_NOT_SUID;
  }
  else
  {
    /*
      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).
    */
    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)) &&
        check_global_access(thd, SUPER_ACL))
    {
      my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), "SUPER");
      DBUG_RETURN(TRUE);
    }
  }

  /* 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 */

  DBUG_RETURN(FALSE);
}


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

  IMPLEMENTATION

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

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

  RETURN
    FALSE       OK
    TRUE        Error
*/
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bool
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mysql_execute_command(THD *thd)
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{
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  bool res= FALSE;
  bool need_start_waiting= FALSE; // have protection against global read lock
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  int  up_result= 0;
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  LEX  *lex= thd->lex;
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  /* first SELECT_LEX (have special meaning for many of non-SELECTcommands) */
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  SELECT_LEX *select_lex= &lex->select_lex;
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  /* first table of first SELECT_LEX */
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  TABLE_LIST *first_table= (TABLE_LIST*) select_lex->table_list.first;
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  /* list of all tables in query */
  TABLE_LIST *all_tables;
  /* most outer SELECT_LEX_UNIT of query */
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  SELECT_LEX_UNIT *unit= &lex->unit;
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  /* Saved variable value */
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  DBUG_ENTER("mysql_execute_command");
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  thd->net.no_send_error= 0;
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#ifdef WITH_PARTITION_STORAGE_ENGINE
  thd->work_part_info= 0;
#endif
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  /*
    In many cases first table of main SELECT_LEX have special meaning =>
    check that it is first table in global list and relink it first in 
    queries_tables list if it is necessary (we need such relinking only
    for queries with subqueries in select list, in this case tables of
    subqueries will go to global list first)

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

    Because of above in place where should be at least one table in most
    outer SELECT_LEX we have following check:
    DBUG_ASSERT(first_table == all_tables);
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
  */
  lex->first_lists_tables_same();
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  /* should be assigned after making first tables same */
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  all_tables= lex->query_tables;
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  /* 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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  /*
    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.
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    Don't reset warnings when executing a stored routine.
1684
  */
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  if ((all_tables || &lex->select_lex != lex->all_selects_list ||
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       lex->sroutines.records) && !thd->spcont)
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    mysql_reset_errors(thd, 0);
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#ifdef HAVE_REPLICATION
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  if (unlikely(thd->slave_thread))
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  {
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    if (lex->sql_command == SQLCOM_DROP_TRIGGER)
    {
      /*
        When dropping a trigger, we need to load its table name
        before checking slave filter rules.
      */
      add_table_for_trigger(thd, thd->lex->spname, 1, &all_tables);
      
      if (!all_tables)
      {
        /*
          If table name cannot be loaded,
          it means the trigger does not exists possibly because
          CREATE TRIGGER was previously skipped for this trigger
          according to slave filtering rules.
          Returning success without producing any errors in this case.
        */
        DBUG_RETURN(0);
      }
      
      // force searching in slave.cc:tables_ok() 
      all_tables->updating= 1;
    }
    
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    /*
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      Check if statment should be skipped because of slave filtering
      rules
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      Exceptions are:
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      - UPDATE MULTI: For this statement, we want to check the filtering
        rules later in the code
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      - SET: we always execute it (Not that many SET commands exists in
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        the binary log anyway -- only 4.1 masters write SET statements,
	in 5.0 there are no SET statements in the binary log)
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      - 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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    */
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    if (!(lex->sql_command == SQLCOM_UPDATE_MULTI) &&
	!(lex->sql_command == SQLCOM_SET_OPTION) &&
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	!(lex->sql_command == SQLCOM_DROP_TABLE &&
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          lex->drop_temporary && lex->drop_if_exists) &&
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        all_tables_not_ok(thd, all_tables))
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    {
      /* we warn the slave SQL thread */
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      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
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      if (thd->one_shot_set)
      {
        /*
          It's ok to check thd->one_shot_set here:

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

          At least there seems to be problems in the rli cache for
          charsets if we are using ONE_SHOT.  Note that this is normally no
          problem because either the >= 5.0 slave reads a 4.1 binlog (with
          ONE_SHOT) *or* or 5.0 binlog (without ONE_SHOT) but never both."
        */
        reset_one_shot_variables(thd);
      }
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      DBUG_RETURN(0);
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    }
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  }
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  else
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  {
1759
#endif /* HAVE_REPLICATION */
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    /*
      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) &&
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	(sql_command_flags[lex->sql_command] & CF_CHANGES_DATA) &&
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        !((lex->sql_command == SQLCOM_CREATE_TABLE) &&
          (lex->create_info.options & HA_LEX_CREATE_TMP_TABLE)) &&
        !((lex->sql_command == SQLCOM_DROP_TABLE) && lex->drop_temporary) &&
        ((lex->sql_command != SQLCOM_UPDATE_MULTI) &&
          some_non_temp_table_to_be_updated(thd, all_tables)))
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    {
      my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only");
      DBUG_RETURN(-1);
    }
#ifdef HAVE_REPLICATION
  } /* endif unlikely slave */
#endif
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  status_var_increment(thd->status_var.com_stat[lex->sql_command]);
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  switch (lex->sql_command) {
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  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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  case SQLCOM_SELECT:
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    thd->status_var.last_query_cost= 0.0;
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    if (all_tables)
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    {
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      res= check_table_access(thd,
                              lex->exchange ? SELECT_ACL | FILE_ACL :
                              SELECT_ACL,
                              all_tables, 0);
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    }
    else
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      res= check_access(thd,
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                        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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    break;
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  case SQLCOM_PREPARE:
1838
  {
1839
    mysql_sql_stmt_prepare(thd);
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    break;
  }
  case SQLCOM_EXECUTE:
  {
1844
    mysql_sql_stmt_execute(thd);
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    break;
  }
  case SQLCOM_DEALLOCATE_PREPARE:
  {
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    mysql_sql_stmt_close(thd);
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    break;
  }
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  case SQLCOM_DO:
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    if (check_table_access(thd, SELECT_ACL, all_tables, 0) ||
        open_and_lock_tables(thd, all_tables))
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      goto error;
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    res= mysql_do(thd, *lex->insert_list);
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    break;

1860
  case SQLCOM_EMPTY_QUERY:
1861
    send_ok(thd);
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    break;

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

1868
#ifndef EMBEDDED_LIBRARY
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  case SQLCOM_PURGE:
1870
  {
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    if (check_global_access(thd, SUPER_ACL))
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      goto error;
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    /* PURGE MASTER LOGS TO 'file' */
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    res = purge_master_logs(thd, lex->to_log);
    break;
  }
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  case SQLCOM_PURGE_BEFORE:
  {
1879 1880
    Item *it;

1881 1882
    if (check_global_access(thd, SUPER_ACL))
      goto error;
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    /* PURGE MASTER LOGS BEFORE 'data' */
1884
    it= (Item *)lex->value_list.head();
1885
    if ((!it->fixed && it->fix_fields(lex->thd, &it)) ||
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        it->check_cols(1))
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    {
      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());
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    break;
  }
1900
#endif
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  case SQLCOM_SHOW_WARNS:
  {
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    res= mysqld_show_warnings(thd, (ulong)
			      ((1L << (uint) MYSQL_ERROR::WARN_LEVEL_NOTE) |
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			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_WARN) |
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR)
			       ));
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    break;
  }
  case SQLCOM_SHOW_ERRORS:
  {
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    res= mysqld_show_warnings(thd, (ulong)
			      (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR));
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    break;
  }
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  case SQLCOM_SHOW_NEW_MASTER:
  {
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    if (check_global_access(thd, REPL_SLAVE_ACL))
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      goto error;
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    /* This query don't work now. See comment in repl_failsafe.cc */
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#ifndef WORKING_NEW_MASTER
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    my_error(ER_NOT_SUPPORTED_YET, MYF(0), "SHOW NEW MASTER");
    goto error;
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#else
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    res = show_new_master(thd);
    break;
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#endif
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  }
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#ifdef HAVE_REPLICATION
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  case SQLCOM_SHOW_SLAVE_HOSTS:
  {
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    if (check_global_access(thd, REPL_SLAVE_ACL))
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      goto error;
    res = show_slave_hosts(thd);
    break;
  }
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  case SQLCOM_SHOW_BINLOG_EVENTS:
  {
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    if (check_global_access(thd, REPL_SLAVE_ACL))
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      goto error;
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    res = mysql_show_binlog_events(thd);
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    break;
  }
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#endif

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  case SQLCOM_BACKUP_TABLE:
1948
  {
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    DBUG_ASSERT(first_table == all_tables && first_table != 0);
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    if (check_table_access(thd, SELECT_ACL, all_tables, 0) ||
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	check_global_access(thd, FILE_ACL))
1952
      goto error; /* purecov: inspected */
1953
    thd->enable_slow_log= opt_log_slow_admin_statements;
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    res = mysql_backup_table(thd, first_table);
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    select_lex->table_list.first= (uchar*) first_table;
1956
    lex->query_tables=all_tables;
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    break;
  }
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  case SQLCOM_RESTORE_TABLE:
1960
  {
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    DBUG_ASSERT(first_table == all_tables && first_table != 0);
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    if (check_table_access(thd, INSERT_ACL, all_tables, 0) ||
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	check_global_access(thd, FILE_ACL))
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      goto error; /* purecov: inspected */
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    thd->enable_slow_log= opt_log_slow_admin_statements;
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    res = mysql_restore_table(thd, first_table);
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    select_lex->table_list.first= (uchar*) first_table;
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    lex->query_tables=all_tables;
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    break;
  }
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  case SQLCOM_ASSIGN_TO_KEYCACHE:
  {
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    DBUG_ASSERT(first_table == all_tables && first_table != 0);
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    if (check_access(thd, INDEX_ACL, first_table->db,
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                     &first_table->grant.privilege, 0, 0,
                     test(first_table->schema_table)))
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      goto error;
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    res= mysql_assign_to_keycache(thd, first_table, &lex->ident);
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    break;
  }
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  case SQLCOM_PRELOAD_KEYS:
  {
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    DBUG_ASSERT(first_table == all_tables && first_table != 0);
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    if (check_access(thd, INDEX_ACL, first_table->db,
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                     &first_table->grant.privilege, 0, 0,
                     test(first_table->schema_table)))
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      goto error;
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    res = mysql_preload_keys(thd, first_table);
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    break;
  }
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#ifdef HAVE_REPLICATION
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  case SQLCOM_CHANGE_MASTER:
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  {
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    if (check_global_access(thd, SUPER_ACL))
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      goto error;
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    pthread_mutex_lock(&LOCK_active_mi);
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    res = change_master(thd,active_mi);
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    pthread_mutex_unlock(&LOCK_active_mi);
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    break;
  }
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  case SQLCOM_SHOW_SLAVE_STAT:
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  {
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    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
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      goto error;
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    pthread_mutex_lock(&LOCK_active_mi);
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    res = show_master_info(thd,active_mi);
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    pthread_mutex_unlock(&LOCK_active_mi);
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    break;
  }
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  case SQLCOM_SHOW_MASTER_STAT:
2012
  {
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    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
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      goto error;
    res = show_binlog_info(thd);
    break;
  }
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  case SQLCOM_LOAD_MASTER_DATA: // sync with master
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    if (check_global_access(thd, SUPER_ACL))
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      goto error;
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    if (end_active_trans(thd))
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      goto error;
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    res = load_master_data(thd);
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    break;
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#endif /* HAVE_REPLICATION */
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  case SQLCOM_SHOW_ENGINE_STATUS:
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    {
2030
      if (check_global_access(thd, SUPER_ACL))
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        goto error;
      res = ha_show_status(thd, lex->create_info.db_type, HA_ENGINE_STATUS);
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      break;
    }
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2035
  case SQLCOM_SHOW_ENGINE_MUTEX:
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2036 2037
    {
      if (check_global_access(thd, SUPER_ACL))
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2038
        goto error;
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2039
      res = ha_show_status(thd, lex->create_info.db_type, HA_ENGINE_MUTEX);
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2040 2041
      break;
    }
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2042
#ifdef HAVE_REPLICATION
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2043
  case SQLCOM_LOAD_MASTER_TABLE:
2044
  {
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VIEW  
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2045
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
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2046 2047
    DBUG_ASSERT(first_table->db); /* Must be set in the parser */

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VIEW  
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2048
    if (check_access(thd, CREATE_ACL, first_table->db,
2049 2050
		     &first_table->grant.privilege, 0, 0,
                     test(first_table->schema_table)))
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2051
      goto error;				/* purecov: inspected */
2052 2053 2054 2055
    /* Check that the first table has CREATE privilege */
    if (check_grant(thd, CREATE_ACL, all_tables, 0, 1, 0))
      goto error;

2056
    pthread_mutex_lock(&LOCK_active_mi);
2057 2058 2059 2060
    /*
      fetch_master_table will send the error to the client on failure.
      Give error if the table already exists.
    */
2061
    if (!fetch_master_table(thd, first_table->db, first_table->table_name,
2062
			    active_mi, 0, 0))
2063
    {
2064
      send_ok(thd);
2065
    }
2066
    pthread_mutex_unlock(&LOCK_active_mi);
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2067
    break;
2068
  }
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2069
#endif /* HAVE_REPLICATION */
2070

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2071
  case SQLCOM_CREATE_TABLE:
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2072
  {
2073
    /* If CREATE TABLE of non-temporary table, do implicit commit */
2074 2075 2076 2077 2078 2079 2080 2081
    if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE))
    {
      if (end_active_trans(thd))
      {
	res= -1;
	break;
      }
    }
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VIEW  
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2082 2083 2084 2085 2086
    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;
2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107
    /*
      Code below (especially in mysql_create_table() and select_create
      methods) may modify HA_CREATE_INFO structure in LEX, so we have to
      use a copy of this structure to make execution prepared statement-
      safe. A shallow copy is enough as this code won't modify any memory
      referenced from this structure.
    */
    HA_CREATE_INFO create_info(lex->create_info);
    /*
      We need to copy alter_info for the same reasons of re-execution
      safety, only in case of Alter_info we have to do (almost) a deep
      copy.
    */
    Alter_info alter_info(lex->alter_info, thd->mem_root);

    if (thd->is_fatal_error)
    {
      /* If out of memory when creating a copy of alter_info. */
      res= 1;
      goto end_with_restore_list;
    }
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2108

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VIEW  
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2109
    if ((res= create_table_precheck(thd, select_tables, create_table)))
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2110
      goto end_with_restore_list;
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2111

2112 2113 2114
    /* Might have been updated in create_table_precheck */
    create_info.alias= create_table->alias;

2115
#ifndef HAVE_READLINK
2116
    if (create_info.data_file_name)
2117 2118
      push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
                   "DATA DIRECTORY option ignored");
2119
    if (create_info.index_file_name)
2120 2121
      push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
                   "INDEX DIRECTORY option ignored");
2122
    create_info.data_file_name= create_info.index_file_name= NULL;
2123
#else
2124
    /* Fix names if symlinked tables */
2125
    if (append_file_to_dir(thd, &create_info.data_file_name,
2126
			   create_table->table_name) ||
2127
	append_file_to_dir(thd, &create_info.index_file_name,
2128
			   create_table->table_name))
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2129
      goto end_with_restore_list;
2130
#endif
2131
    /*
2132
      If we are using SET CHARSET without DEFAULT, add an implicit
2133 2134
      DEFAULT to not confuse old users. (This may change).
    */
2135
    if ((create_info.used_fields &
2136 2137 2138
	 (HA_CREATE_USED_DEFAULT_CHARSET | HA_CREATE_USED_CHARSET)) ==
	HA_CREATE_USED_CHARSET)
    {
2139 2140 2141 2142
      create_info.used_fields&= ~HA_CREATE_USED_CHARSET;
      create_info.used_fields|= HA_CREATE_USED_DEFAULT_CHARSET;
      create_info.default_table_charset= create_info.table_charset;
      create_info.table_charset= 0;
2143
    }
2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156
    /*
      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.
    */
2157 2158
    if (!thd->locked_tables &&
        !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
2159
    {
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2160 2161
      res= 1;
      goto end_with_restore_list;
2162
    }
2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173
#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
2174
    if (select_lex->item_list.elements)		// With select
unknown's avatar
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2175 2176
    {
      select_result *result;
2177

2178
      select_lex->options|= SELECT_NO_UNLOCK;
2179
      unit->set_limit(select_lex);
2180

2181
      if (!(create_info.options & HA_LEX_CREATE_TMP_TABLE))
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2182 2183 2184 2185 2186 2187
      {
        lex->link_first_table_back(create_table, link_to_local);
        create_table->create= TRUE;
      }

      if (!(res= open_and_lock_tables(thd, lex->query_tables)))
2188
      {
2189 2190 2191 2192
        /*
          Is table which we are changing used somewhere in other parts
          of query
        */
2193
        if (!(create_info.options & HA_LEX_CREATE_TMP_TABLE))
2194
        {
2195
          TABLE_LIST *duplicate;
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2196
          create_table= lex->unlink_first_table(&link_to_local);
2197
          if ((duplicate= unique_table(thd, create_table, select_tables, 0)))
2198 2199 2200
          {
            update_non_unique_table_error(create_table, "CREATE", duplicate);
            res= 1;
2201
            goto end_with_restore_list;
2202
          }
2203
        }
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2204
        /* If we create merge table, we have to test tables in merge, too */
2205
        if (create_info.used_fields & HA_CREATE_USED_UNION)
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2206 2207
        {
          TABLE_LIST *tab;
2208
          for (tab= (TABLE_LIST*) create_info.merge_list.first;
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2209 2210 2211
               tab;
               tab= tab->next_local)
          {
2212
            TABLE_LIST *duplicate;
2213
            if ((duplicate= unique_table(thd, tab, select_tables, 0)))
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2214
            {
2215
              update_non_unique_table_error(tab, "CREATE", duplicate);
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2216
              res= 1;
2217
              goto end_with_restore_list;
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2218 2219 2220
            }
          }
        }
2221

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2222
        /*
2223 2224
          select_create is currently not re-execution friendly and
          needs to be created for every execution of a PS/SP.
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2225
        */
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VIEW  
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2226
        if ((result= new select_create(create_table,
2227 2228 2229 2230 2231
                                       &create_info,
                                       &alter_info,
                                       select_lex->item_list,
                                       lex->duplicates,
                                       lex->ignore)))
2232 2233 2234 2235 2236
        {
          /*
            CREATE from SELECT give its SELECT_LEX for SELECT,
            and item_list belong to SELECT
          */
2237
          res= handle_select(thd, lex, result, 0);
2238
          delete result;
2239
        }
2240
      }
2241
      else if (!(create_info.options & HA_LEX_CREATE_TMP_TABLE))
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2242 2243
        create_table= lex->unlink_first_table(&link_to_local);

2244
    }
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2245
    else
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2246
    {
2247
      /* So that CREATE TEMPORARY TABLE gets to binlog at commit/rollback */
2248
      if (create_info.options & HA_LEX_CREATE_TMP_TABLE)
2249
        thd->options|= OPTION_KEEP_LOG;
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2250
      /* regular create */
2251
      if (create_info.options & HA_LEX_CREATE_TABLE_LIKE)
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2252
        res= mysql_create_like_table(thd, create_table, select_tables,
2253
                                     &create_info);
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2254
      else
2255
      {
unknown's avatar
VIEW  
unknown committed
2256
        res= mysql_create_table(thd, create_table->db,
2257 2258
                                create_table->table_name, &create_info,
                                &alter_info, 0, 0);
2259
      }
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2260
      if (!res)
2261
	send_ok(thd);
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2262
    }
2263

unknown's avatar
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2264
    /* put tables back for PS rexecuting */
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2265
end_with_restore_list:
unknown's avatar
VIEW  
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2266
    lex->link_first_table_back(create_table, link_to_local);
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2267
    break;
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2268
  }
unknown's avatar
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2269
  case SQLCOM_CREATE_INDEX:
2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287
    /* Fall through */
  case SQLCOM_DROP_INDEX:
  /*
    CREATE INDEX and DROP INDEX are implemented by calling ALTER
    TABLE with proper arguments.

    In the future ALTER TABLE will notice that the request is to
    only add indexes and create these one by one for the existing
    table without having to do a full rebuild.
  */
  {
    /* Prepare stack copies to be re-execution safe */
    HA_CREATE_INFO create_info;
    Alter_info alter_info(lex->alter_info, thd->mem_root);

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

unknown's avatar
VIEW  
unknown committed
2288 2289
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_one_table_access(thd, INDEX_ACL, all_tables))
unknown's avatar
unknown committed
2290
      goto error; /* purecov: inspected */
2291
    if (end_active_trans(thd))
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2292
      goto error;
2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303
    /*
      Currently CREATE INDEX or DROP INDEX cause a full table rebuild
      and thus classify as slow administrative statements just like
      ALTER TABLE.
    */
    thd->enable_slow_log= opt_log_slow_admin_statements;

    bzero((char*) &create_info, sizeof(create_info));
    create_info.db_type= 0;
    create_info.row_type= ROW_TYPE_NOT_USED;
    create_info.default_table_charset= thd->variables.collation_database;
unknown's avatar
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2304

2305 2306 2307 2308 2309
    res= mysql_alter_table(thd, first_table->db, first_table->table_name,
                           &create_info, first_table, &alter_info,
                           0, (ORDER*) 0, 0);
    break;
  }
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2310
#ifdef HAVE_REPLICATION
unknown's avatar
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2311
  case SQLCOM_SLAVE_START:
2312
  {
2313
    pthread_mutex_lock(&LOCK_active_mi);
2314
    start_slave(thd,active_mi,1 /* net report*/);
2315
    pthread_mutex_unlock(&LOCK_active_mi);
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2316
    break;
2317
  }
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2318
  case SQLCOM_SLAVE_STOP:
2319 2320 2321 2322 2323 2324
  /*
    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,
2325
      so it waits for the client thread because t is locked by it.
2326
    - then the client thread does SLAVE STOP.
2327 2328
      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.
2329 2330 2331
    To prevent that, refuse SLAVE STOP if the
    client thread has locked tables
  */
2332
  if (thd->locked_tables || thd->active_transaction() || thd->global_read_lock)
2333
  {
2334 2335
    my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
               ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
2336
    goto error;
2337
  }
2338
  {
2339
    pthread_mutex_lock(&LOCK_active_mi);
2340
    stop_slave(thd,active_mi,1/* net report*/);
2341
    pthread_mutex_unlock(&LOCK_active_mi);
unknown's avatar
unknown committed
2342
    break;
2343
  }
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2344
#endif /* HAVE_REPLICATION */
2345

unknown's avatar
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2346
  case SQLCOM_ALTER_TABLE:
unknown's avatar
VIEW  
unknown committed
2347
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
2348
    {
unknown's avatar
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2349
      ulong priv=0;
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2350
      ulong priv_needed= ALTER_ACL;
2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361
      /*
        Code in mysql_alter_table() may modify its HA_CREATE_INFO argument,
        so we have to use a copy of this structure to make execution
        prepared statement- safe. A shallow copy is enough as no memory
        referenced from this structure will be modified.
      */
      HA_CREATE_INFO create_info(lex->create_info);
      Alter_info alter_info(lex->alter_info, thd->mem_root);

      if (thd->is_fatal_error) /* out of memory creating a copy of alter_info */
        goto error;
2362 2363 2364 2365
      /*
        We also require DROP priv for ALTER TABLE ... DROP PARTITION, as well
        as for RENAME TO, as being done by SQLCOM_RENAME_TABLE
      */
2366
      if (alter_info.flags & (ALTER_DROP_PARTITION | ALTER_RENAME))
unknown's avatar
unknown committed
2367 2368
        priv_needed|= DROP_ACL;

unknown's avatar
unknown committed
2369 2370
      /* Must be set in the parser */
      DBUG_ASSERT(select_lex->db);
unknown's avatar
unknown committed
2371
      if (check_access(thd, priv_needed, first_table->db,
2372 2373 2374 2375
		       &first_table->grant.privilege, 0, 0,
                       test(first_table->schema_table)) ||
	  check_access(thd,INSERT_ACL | CREATE_ACL,select_lex->db,&priv,0,0,
                       is_schema_db(select_lex->db))||
unknown's avatar
VIEW  
unknown committed
2376
	  check_merge_table_access(thd, first_table->db,
2377
				   (TABLE_LIST *)
2378
				   create_info.merge_list.first))
2379
	goto error;				/* purecov: inspected */
2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391
      if (check_grant(thd, priv_needed, all_tables, 0, UINT_MAX, 0))
        goto error;
      if (lex->name.str && !test_all_bits(priv,INSERT_ACL | CREATE_ACL))
      { // Rename of table
          TABLE_LIST tmp_table;
          bzero((char*) &tmp_table,sizeof(tmp_table));
          tmp_table.table_name= lex->name.str;
          tmp_table.db=select_lex->db;
          tmp_table.grant.privilege=priv;
          if (check_grant(thd, INSERT_ACL | CREATE_ACL, &tmp_table, 0,
              UINT_MAX, 0))
            goto error;
unknown's avatar
unknown committed
2392
      }
2393

2394
      /* Don't yet allow changing of symlinks with ALTER TABLE */
2395
      if (create_info.data_file_name)
2396 2397
        push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
                     "DATA DIRECTORY option ignored");
2398
      if (create_info.index_file_name)
2399 2400
        push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
                     "INDEX DIRECTORY option ignored");
2401
      create_info.data_file_name= create_info.index_file_name= NULL;
unknown's avatar
unknown committed
2402
      /* ALTER TABLE ends previous transaction */
2403
      if (end_active_trans(thd))
unknown's avatar
unknown committed
2404
	goto error;
2405

2406 2407 2408 2409 2410
      if (!thd->locked_tables &&
          !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
      {
        res= 1;
        break;
unknown's avatar
unknown committed
2411
      }
2412

2413
      thd->enable_slow_log= opt_log_slow_admin_statements;
2414
      res= mysql_alter_table(thd, select_lex->db, lex->name.str,
2415 2416 2417
                             &create_info,
                             first_table,
                             &alter_info,
2418 2419
                             select_lex->order_list.elements,
                             (ORDER *) select_lex->order_list.first,
2420
                             lex->ignore);
unknown's avatar
unknown committed
2421 2422
      break;
    }
unknown's avatar
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2423
  case SQLCOM_RENAME_TABLE:
unknown's avatar
unknown committed
2424
  {
unknown's avatar
VIEW  
unknown committed
2425
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
2426
    TABLE_LIST *table;
unknown's avatar
VIEW  
unknown committed
2427
    for (table= first_table; table; table= table->next_local->next_local)
unknown's avatar
unknown committed
2428
    {
unknown's avatar
unknown committed
2429
      if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
2430
		       &table->grant.privilege,0,0, test(table->schema_table)) ||
unknown's avatar
VIEW  
unknown committed
2431
	  check_access(thd, INSERT_ACL | CREATE_ACL, table->next_local->db,
2432 2433
		       &table->next_local->grant.privilege, 0, 0,
                       test(table->next_local->schema_table)))
unknown's avatar
unknown committed
2434
	goto error;
2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446
      TABLE_LIST old_list, new_list;
      /*
        we do not need initialize old_list and new_list because we will
        come table[0] and table->next[0] there
      */
      old_list= table[0];
      new_list= table->next_local[0];
      if (check_grant(thd, ALTER_ACL | DROP_ACL, &old_list, 0, 1, 0) ||
         (!test_all_bits(table->next_local->grant.privilege,
                         INSERT_ACL | CREATE_ACL) &&
          check_grant(thd, INSERT_ACL | CREATE_ACL, &new_list, 0, 1, 0)))
        goto error;
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unknown committed
2447
    }
unknown's avatar
VIEW  
unknown committed
2448
    query_cache_invalidate3(thd, first_table, 0);
unknown's avatar
unknown committed
2449
    if (end_active_trans(thd) || mysql_rename_tables(thd, first_table, 0))
unknown's avatar
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2450
      goto error;
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2451
    break;
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2452
  }
2453
#ifndef EMBEDDED_LIBRARY
unknown's avatar
unknown committed
2454 2455
  case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
unknown's avatar
unknown committed
2456 2457
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
2458
    goto error;
unknown's avatar
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2459 2460
#else
    {
unknown's avatar
unknown committed
2461
      if (check_global_access(thd, SUPER_ACL))
unknown's avatar
unknown committed
2462 2463 2464 2465
	goto error;
      res = show_binlogs(thd);
      break;
    }
unknown's avatar
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2466
#endif
2467
#endif /* EMBEDDED_LIBRARY */
unknown's avatar
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2468
  case SQLCOM_SHOW_CREATE:
unknown's avatar
VIEW  
unknown committed
2469
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
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2470
#ifdef DONT_ALLOW_SHOW_COMMANDS
unknown's avatar
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2471 2472
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
2473
    goto error;
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2474
#else
unknown's avatar
unknown committed
2475
    {
2476 2477 2478
      /* Ignore temporary tables if this is "SHOW CREATE VIEW" */
      if (lex->only_view)
        first_table->skip_temporary= 1;
unknown's avatar
unknown committed
2479
      if (check_show_create_table_access(thd, first_table))
2480
	goto error;
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2481
      res= mysqld_show_create(thd, first_table);
unknown's avatar
unknown committed
2482 2483
      break;
    }
unknown's avatar
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2484
#endif
2485 2486
  case SQLCOM_CHECKSUM:
  {
unknown's avatar
VIEW  
unknown committed
2487
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
2488
    if (check_table_access(thd, SELECT_ACL | EXTRA_ACL, all_tables, 0))
2489
      goto error; /* purecov: inspected */
unknown's avatar
VIEW  
unknown committed
2490
    res = mysql_checksum_table(thd, first_table, &lex->check_opt);
2491 2492
    break;
  }
unknown's avatar
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2493
  case SQLCOM_REPAIR:
2494
  {
unknown's avatar
VIEW  
unknown committed
2495
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
2496
    if (check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
2497
      goto error; /* purecov: inspected */
2498
    thd->enable_slow_log= opt_log_slow_admin_statements;
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VIEW  
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2499
    res= mysql_repair_table(thd, first_table, &lex->check_opt);
2500 2501 2502
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
2503 2504 2505
      /*
        Presumably, REPAIR and binlog writing doesn't require synchronization
      */
2506 2507
      if (mysql_bin_log.is_open())
      {
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2508
	thd->clear_error(); // No binlog error generated
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2509 2510
        thd->binlog_query(THD::STMT_QUERY_TYPE,
                          thd->query, thd->query_length, 0, FALSE);
2511 2512
      }
    }
2513
    select_lex->table_list.first= (uchar*) first_table;
2514
    lex->query_tables=all_tables;
2515 2516
    break;
  }
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2517
  case SQLCOM_CHECK:
2518
  {
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VIEW  
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2519
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
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2520
    if (check_table_access(thd, SELECT_ACL | EXTRA_ACL , all_tables, 0))
2521
      goto error; /* purecov: inspected */
2522
    thd->enable_slow_log= opt_log_slow_admin_statements;
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VIEW  
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2523
    res = mysql_check_table(thd, first_table, &lex->check_opt);
2524
    select_lex->table_list.first= (uchar*) first_table;
2525
    lex->query_tables=all_tables;
2526 2527
    break;
  }
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2528 2529
  case SQLCOM_ANALYZE:
  {
unknown's avatar
VIEW  
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2530
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
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2531
    if (check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
unknown's avatar
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2532
      goto error; /* purecov: inspected */
2533
    thd->enable_slow_log= opt_log_slow_admin_statements;
2534
    res= mysql_analyze_table(thd, first_table, &lex->check_opt);
2535 2536 2537
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
2538 2539 2540
      /*
        Presumably, ANALYZE and binlog writing doesn't require synchronization
      */
2541 2542
      if (mysql_bin_log.is_open())
      {
unknown's avatar
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2543
	thd->clear_error(); // No binlog error generated
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2544 2545
        thd->binlog_query(THD::STMT_QUERY_TYPE,
                          thd->query, thd->query_length, 0, FALSE);
2546 2547
      }
    }
2548
    select_lex->table_list.first= (uchar*) first_table;
2549
    lex->query_tables=all_tables;
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2550
    break;
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2551
  }
2552

unknown's avatar
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2553 2554
  case SQLCOM_OPTIMIZE:
  {
unknown's avatar
VIEW  
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2555
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
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2556
    if (check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
unknown's avatar
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2557
      goto error; /* purecov: inspected */
2558
    thd->enable_slow_log= opt_log_slow_admin_statements;
2559
    res= (specialflag & (SPECIAL_SAFE_MODE | SPECIAL_NO_NEW_FUNC)) ?
2560
      mysql_recreate_table(thd, first_table) :
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VIEW  
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2561
      mysql_optimize_table(thd, first_table, &lex->check_opt);
2562 2563 2564
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
2565 2566 2567
      /*
        Presumably, OPTIMIZE and binlog writing doesn't require synchronization
      */
2568 2569
      if (mysql_bin_log.is_open())
      {
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2570
	thd->clear_error(); // No binlog error generated
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2571 2572
        thd->binlog_query(THD::STMT_QUERY_TYPE,
                          thd->query, thd->query_length, 0, FALSE);
2573 2574
      }
    }
2575
    select_lex->table_list.first= (uchar*) first_table;
2576
    lex->query_tables=all_tables;
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2577 2578 2579
    break;
  }
  case SQLCOM_UPDATE:
unknown's avatar
VIEW  
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2580 2581
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (update_precheck(thd, all_tables))
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2582
      break;
2583 2584
    DBUG_ASSERT(select_lex->offset_limit == 0);
    unit->set_limit(select_lex);
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2585 2586 2587 2588 2589 2590 2591 2592
    res= (up_result= mysql_update(thd, all_tables,
                                  select_lex->item_list,
                                  lex->value_list,
                                  select_lex->where,
                                  select_lex->order_list.elements,
                                  (ORDER *) select_lex->order_list.first,
                                  unit->select_limit_cnt,
                                  lex->duplicates, lex->ignore));
2593
    /* mysql_update return 2 if we need to switch to multi-update */
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2594
    if (up_result != 2)
2595
      break;
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2596
    /* Fall through */
2597
  case SQLCOM_UPDATE_MULTI:
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2598 2599 2600
  {
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    /* if we switched from normal update, rights are checked */
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2601
    if (up_result != 2)
2602
    {
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2603 2604 2605 2606 2607
      if ((res= multi_update_precheck(thd, all_tables)))
        break;
    }
    else
      res= 0;
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2608

2609
    res= mysql_multi_update_prepare(thd);
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2610

2611
#ifdef HAVE_REPLICATION
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2612
    /* Check slave filtering rules */
2613
    if (unlikely(thd->slave_thread))
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2614
    {
2615 2616
      if (all_tables_not_ok(thd, all_tables))
      {
2617 2618 2619 2620 2621
        if (res!= 0)
        {
          res= 0;             /* don't care of prev failure  */
          thd->clear_error(); /* filters are of highest prior */
        }
2622 2623 2624 2625
        /* we warn the slave SQL thread */
        my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
        break;
      }
2626 2627
      if (res)
        break;
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2628
    }
2629 2630
    else
    {
2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643
#endif /* HAVE_REPLICATION */
      if (res)
        break;
      if (opt_readonly &&
	  !(thd->security_ctx->master_access & SUPER_ACL) &&
	  some_non_temp_table_to_be_updated(thd, all_tables))
      {
	my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only");
	break;
      }
#ifdef HAVE_REPLICATION
    }  /* unlikely */
#endif
unknown's avatar
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2644

unknown's avatar
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2645 2646 2647 2648 2649 2650
    res= mysql_multi_update(thd, all_tables,
                            &select_lex->item_list,
                            &lex->value_list,
                            select_lex->where,
                            select_lex->options,
                            lex->duplicates, lex->ignore, unit, select_lex);
unknown's avatar
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2651
    break;
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2652
  }
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2653
  case SQLCOM_REPLACE:
2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683
#ifndef DBUG_OFF
    if (mysql_bin_log.is_open())
    {
      /*
        Generate an incident log event before writing the real event
        to the binary log.  We put this event is before the statement
        since that makes it simpler to check that the statement was
        not executed on the slave (since incidents usually stop the
        slave).

        Observe that any row events that are generated will be
        generated before.

        This is only for testing purposes and will not be present in a
        release build.
      */

      Incident incident= INCIDENT_NONE;
      DBUG_PRINT("debug", ("Just before generate_incident()"));
      DBUG_EXECUTE_IF("incident_database_resync_on_replace",
                      incident= INCIDENT_LOST_EVENTS;);
      if (incident)
      {
        Incident_log_event ev(thd, incident);
        mysql_bin_log.write(&ev);
        mysql_bin_log.rotate_and_purge(RP_FORCE_ROTATE);
      }
      DBUG_PRINT("debug", ("Just after generate_incident()"));
    }
#endif
2684 2685
  case SQLCOM_INSERT:
  {
unknown's avatar
VIEW  
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2686
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
2687
    if ((res= insert_precheck(thd, all_tables)))
unknown's avatar
unknown committed
2688
      break;
2689 2690 2691 2692 2693 2694 2695 2696

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

unknown's avatar
VIEW  
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2697
    res= mysql_insert(thd, all_tables, lex->field_list, lex->many_values,
unknown's avatar
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2698
		      lex->update_list, lex->value_list,
2699
                      lex->duplicates, lex->ignore);
2700 2701 2702 2703 2704 2705 2706

    /*
      If we have inserted into a VIEW, and the base table has
      AUTO_INCREMENT column, but this column is not accessible through
      a view, then we should restore LAST_INSERT_ID to the value it
      had before the statement.
    */
unknown's avatar
VIEW  
unknown committed
2707
    if (first_table->view && !first_table->contain_auto_increment)
2708 2709
      thd->first_successful_insert_id_in_cur_stmt=
        thd->first_successful_insert_id_in_prev_stmt;
2710

unknown's avatar
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2711
    break;
2712
  }
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2713 2714 2715
  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
  {
unknown's avatar
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2716
    select_result *sel_result;
unknown's avatar
VIEW  
unknown committed
2717
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
2718
    if ((res= insert_precheck(thd, all_tables)))
2719
      break;
unknown's avatar
unknown committed
2720

2721
    /* Fix lock for first table */
unknown's avatar
VIEW  
unknown committed
2722 2723
    if (first_table->lock_type == TL_WRITE_DELAYED)
      first_table->lock_type= TL_WRITE;
2724

2725 2726
    /* Don't unlock tables until command is written to binary log */
    select_lex->options|= SELECT_NO_UNLOCK;
unknown's avatar
unknown committed
2727

2728
    unit->set_limit(select_lex);
2729 2730 2731 2732 2733 2734 2735 2736

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

unknown's avatar
VIEW  
unknown committed
2737
    if (!(res= open_and_lock_tables(thd, all_tables)))
2738
    {
2739
      /* Skip first table, which is the table we are inserting in */
unknown's avatar
unknown committed
2740
      TABLE_LIST *second_table= first_table->next_local;
2741
      select_lex->table_list.first= (uchar*) second_table;
2742 2743
      select_lex->context.table_list= 
        select_lex->context.first_name_resolution_table= second_table;
2744
      res= mysql_insert_select_prepare(thd);
unknown's avatar
unknown committed
2745 2746 2747 2748 2749 2750 2751
      if (!res && (sel_result= new select_insert(first_table,
                                                 first_table->table,
                                                 &lex->field_list,
                                                 &lex->update_list,
                                                 &lex->value_list,
                                                 lex->duplicates,
                                                 lex->ignore)))
2752
      {
unknown's avatar
unknown committed
2753
	res= handle_select(thd, lex, sel_result, OPTION_SETUP_TABLES_DONE);
2754 2755 2756 2757 2758 2759 2760 2761 2762
        /*
          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)
        {
2763 2764 2765
          /* INSERT ... SELECT should invalidate only the very first table */
          TABLE_LIST *save_table= first_table->next_local;
          first_table->next_local= 0;
2766 2767
          mysql_unlock_tables(thd, thd->lock);
          query_cache_invalidate3(thd, first_table, 1);
2768
          first_table->next_local= save_table;
2769 2770
          thd->lock=0;
        }
unknown's avatar
unknown committed
2771
        delete sel_result;
2772
      }
2773
      /* revert changes for SP */
2774
      select_lex->table_list.first= (uchar*) first_table;
2775
    }
unknown's avatar
VIEW  
unknown committed
2776

2777 2778 2779 2780 2781 2782
    /*
      If we have inserted into a VIEW, and the base table has
      AUTO_INCREMENT column, but this column is not accessible through
      a view, then we should restore LAST_INSERT_ID to the value it
      had before the statement.
    */
unknown's avatar
VIEW  
unknown committed
2783
    if (first_table->view && !first_table->contain_auto_increment)
2784 2785
      thd->first_successful_insert_id_in_cur_stmt=
        thd->first_successful_insert_id_in_prev_stmt;
2786

unknown's avatar
unknown committed
2787 2788
    break;
  }
2789
  case SQLCOM_TRUNCATE:
2790 2791 2792 2793 2794
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
unknown's avatar
VIEW  
unknown committed
2795
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
2796
    if (check_one_table_access(thd, DROP_ACL, all_tables))
unknown's avatar
unknown committed
2797
      goto error;
2798 2799 2800 2801
    /*
      Don't allow this within a transaction because we want to use
      re-generate table
    */
2802
    if (thd->locked_tables || thd->active_transaction())
2803
    {
unknown's avatar
unknown committed
2804 2805
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
2806 2807
      goto error;
    }
unknown's avatar
VIEW  
unknown committed
2808

unknown's avatar
unknown committed
2809
    res= mysql_truncate(thd, first_table, 0);
2810
    break;
unknown's avatar
unknown committed
2811
  case SQLCOM_DELETE:
unknown's avatar
unknown committed
2812
  {
unknown's avatar
VIEW  
unknown committed
2813 2814
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if ((res= delete_precheck(thd, all_tables)))
unknown's avatar
unknown committed
2815
      break;
2816 2817
    DBUG_ASSERT(select_lex->offset_limit == 0);
    unit->set_limit(select_lex);
2818 2819 2820 2821 2822 2823 2824 2825

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

unknown's avatar
VIEW  
unknown committed
2826
    res = mysql_delete(thd, all_tables, select_lex->where,
2827
                       &select_lex->order_list,
unknown's avatar
unknown committed
2828 2829
                       unit->select_limit_cnt, select_lex->options,
                       FALSE);
unknown's avatar
unknown committed
2830 2831
    break;
  }
2832
  case SQLCOM_DELETE_MULTI:
unknown's avatar
unknown committed
2833
  {
unknown's avatar
VIEW  
unknown committed
2834
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2835
    TABLE_LIST *aux_tables=
unknown's avatar
unknown committed
2836
      (TABLE_LIST *)thd->lex->auxiliary_table_list.first;
unknown's avatar
unknown committed
2837
    multi_delete *del_result;
unknown's avatar
unknown committed
2838

2839 2840 2841 2842 2843 2844 2845
    if (!thd->locked_tables &&
        !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
    {
      res= 1;
      break;
    }

2846
    if ((res= multi_delete_precheck(thd, all_tables)))
2847
      break;
unknown's avatar
unknown committed
2848

unknown's avatar
unknown committed
2849
    /* condition will be TRUE on SP re-excuting */
2850 2851
    if (select_lex->item_list.elements != 0)
      select_lex->item_list.empty();
unknown's avatar
unknown committed
2852
    if (add_item_to_list(thd, new Item_null()))
unknown's avatar
unknown committed
2853
      goto error;
2854

unknown's avatar
unknown committed
2855
    thd->proc_info="init";
unknown's avatar
VIEW  
unknown committed
2856 2857 2858 2859
    if ((res= open_and_lock_tables(thd, all_tables)))
      break;

    if ((res= mysql_multi_delete_prepare(thd)))
unknown's avatar
unknown committed
2860
      goto error;
2861

unknown's avatar
unknown committed
2862 2863
    if (!thd->is_fatal_error &&
        (del_result= new multi_delete(aux_tables, lex->table_count)))
unknown's avatar
unknown committed
2864
    {
2865 2866 2867
      res= mysql_select(thd, &select_lex->ref_pointer_array,
			select_lex->get_table_list(),
			select_lex->with_wild,
2868
			select_lex->item_list,
unknown's avatar
unknown committed
2869
			select_lex->where,
2870
			0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
unknown's avatar
unknown committed
2871 2872
			(ORDER *)NULL,
			select_lex->options | thd->options |
2873 2874
			SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK |
                        OPTION_SETUP_TABLES_DONE,
unknown's avatar
unknown committed
2875 2876
			del_result, unit, select_lex);
      delete del_result;
unknown's avatar
unknown committed
2877 2878
    }
    else
2879
      res= TRUE;                                // Error
unknown's avatar
unknown committed
2880 2881
    break;
  }
unknown's avatar
unknown committed
2882
  case SQLCOM_DROP_TABLE:
unknown's avatar
unknown committed
2883
  {
unknown's avatar
VIEW  
unknown committed
2884
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2885 2886
    if (!lex->drop_temporary)
    {
unknown's avatar
VIEW  
unknown committed
2887
      if (check_table_access(thd, DROP_ACL, all_tables, 0))
2888 2889
	goto error;				/* purecov: inspected */
      if (end_active_trans(thd))
unknown's avatar
unknown committed
2890
        goto error;
2891
    }
unknown's avatar
unknown committed
2892
    else
unknown's avatar
unknown committed
2893 2894 2895 2896 2897 2898
    {
      /*
	If this is a slave thread, we may sometimes execute some 
	DROP / * 40005 TEMPORARY * / TABLE
	that come from parts of binlogs (likely if we use RESET SLAVE or CHANGE
	MASTER TO), while the temporary table has already been dropped.
unknown's avatar
unknown committed
2899 2900
	To not generate such irrelevant "table does not exist errors",
	we silently add IF EXISTS if TEMPORARY was used.
unknown's avatar
unknown committed
2901 2902
      */
      if (thd->slave_thread)
2903
        lex->drop_if_exists= 1;
2904

unknown's avatar
unknown committed
2905
      /* So that DROP TEMPORARY TABLE gets to binlog at commit/rollback */
2906
      thd->options|= OPTION_KEEP_LOG;
unknown's avatar
unknown committed
2907
    }
2908
    /* DDL and binlog write order protected by LOCK_open */
unknown's avatar
VIEW  
unknown committed
2909 2910
    res= mysql_rm_table(thd, first_table, lex->drop_if_exists,
			lex->drop_temporary);
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unknown committed
2911 2912
  }
  break;
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2913
  case SQLCOM_SHOW_PROCESSLIST:
2914 2915
    if (!thd->security_ctx->priv_user[0] &&
        check_global_access(thd,PROCESS_ACL))
unknown's avatar
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2916
      break;
unknown's avatar
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2917
    mysqld_list_processes(thd,
2918 2919 2920 2921
			  (thd->security_ctx->master_access & PROCESS_ACL ?
                           NullS :
                           thd->security_ctx->priv_user),
                          lex->verbose);
unknown's avatar
unknown committed
2922
    break;
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unknown committed
2923 2924
  case SQLCOM_SHOW_STORAGE_ENGINES:
    res= mysqld_show_storage_engines(thd);
unknown's avatar
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2925
    break;
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2926 2927 2928
  case SQLCOM_SHOW_AUTHORS:
    res= mysqld_show_authors(thd);
    break;
2929 2930 2931
  case SQLCOM_SHOW_CONTRIBUTORS:
    res= mysqld_show_contributors(thd);
    break;
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unknown committed
2932 2933 2934 2935 2936 2937
  case SQLCOM_SHOW_PRIVILEGES:
    res= mysqld_show_privileges(thd);
    break;
  case SQLCOM_SHOW_COLUMN_TYPES:
    res= mysqld_show_column_types(thd);
    break;
unknown's avatar
unknown committed
2938
  case SQLCOM_SHOW_ENGINE_LOGS:
unknown's avatar
unknown committed
2939
#ifdef DONT_ALLOW_SHOW_COMMANDS
unknown's avatar
unknown committed
2940 2941
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0));	/* purecov: inspected */
2942
    goto error;
unknown's avatar
unknown committed
2943 2944
#else
    {
2945
      if (check_access(thd, FILE_ACL, any_db,0,0,0,0))
unknown's avatar
unknown committed
2946
	goto error;
unknown's avatar
unknown committed
2947
      res= ha_show_status(thd, lex->create_info.db_type, HA_ENGINE_LOGS);
unknown's avatar
unknown committed
2948 2949
      break;
    }
unknown's avatar
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2950 2951
#endif
  case SQLCOM_CHANGE_DB:
2952 2953 2954 2955
  {
    LEX_STRING db_str= { (char *) select_lex->db, strlen(select_lex->db) };

    if (!mysql_change_db(thd, &db_str, FALSE))
2956
      send_ok(thd);
2957

unknown's avatar
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2958
    break;
2959
  }
2960

unknown's avatar
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2961 2962
  case SQLCOM_LOAD:
  {
unknown's avatar
VIEW  
unknown committed
2963
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
unknown committed
2964
    uint privilege= (lex->duplicates == DUP_REPLACE ?
unknown's avatar
unknown committed
2965 2966
		     INSERT_ACL | DELETE_ACL : INSERT_ACL) |
                    (lex->local_file ? 0 : FILE_ACL);
2967

unknown's avatar
unknown committed
2968
    if (lex->local_file)
unknown's avatar
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2969
    {
2970
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
2971
          !opt_local_infile)
2972
      {
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unknown committed
2973
	my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND), MYF(0));
2974 2975
	goto error;
      }
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2976
    }
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2977 2978 2979 2980

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

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VIEW  
unknown committed
2981
    res= mysql_load(thd, lex->exchange, first_table, lex->field_list,
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2982
                    lex->update_list, lex->value_list, lex->duplicates,
2983
                    lex->ignore, (bool) lex->local_file);
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2984 2985
    break;
  }
2986

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2987
  case SQLCOM_SET_OPTION:
2988 2989
  {
    List<set_var_base> *lex_var_list= &lex->var_list;
2990
    if ((check_table_access(thd, SELECT_ACL, all_tables, 0) ||
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unknown committed
2991 2992
	 open_and_lock_tables(thd, all_tables)))
      goto error;
2993 2994
    if (lex->one_shot_set && not_all_support_one_shot(lex_var_list))
    {
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unknown committed
2995 2996
      my_error(ER_RESERVED_SYNTAX, MYF(0), "SET ONE_SHOT");
      goto error;
2997 2998 2999 3000 3001 3002 3003 3004
    }
    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;
3005
      send_ok(thd);
3006
    }
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3007
    break;
3008
  }
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3009

unknown's avatar
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3010
  case SQLCOM_UNLOCK_TABLES:
3011 3012 3013 3014 3015 3016
    /*
      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.
    */
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3017
    unlock_locked_tables(thd);
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3018 3019
    if (thd->options & OPTION_TABLE_LOCK)
    {
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3020
      end_active_trans(thd);
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3021
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
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3022 3023
    }
    if (thd->global_read_lock)
3024
      unlock_global_read_lock(thd);
3025
    send_ok(thd);
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3026 3027
    break;
  case SQLCOM_LOCK_TABLES:
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3028
    unlock_locked_tables(thd);
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3029
    if (end_active_trans(thd))
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3030
      goto error;
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VIEW  
unknown committed
3031
    if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, all_tables, 0))
3032
      goto error;
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3033
    thd->in_lock_tables=1;
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3034
    thd->options|= OPTION_TABLE_LOCK;
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VIEW  
unknown committed
3035

3036
    if (!(res= simple_open_n_lock_tables(thd, all_tables)))
unknown's avatar
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3037
    {
3038 3039
#ifdef HAVE_QUERY_CACHE
      if (thd->variables.query_cache_wlock_invalidate)
unknown's avatar
VIEW  
unknown committed
3040
	query_cache.invalidate_locked_for_write(first_table);
3041
#endif /*HAVE_QUERY_CACHE*/
unknown's avatar
unknown committed
3042 3043
      thd->locked_tables=thd->lock;
      thd->lock=0;
3044
      send_ok(thd);
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3045
    }
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3046 3047
    else
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
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3048 3049 3050
    thd->in_lock_tables=0;
    break;
  case SQLCOM_CREATE_DB:
3051
  {
3052 3053 3054 3055 3056 3057
    /*
      As mysql_create_db() may modify HA_CREATE_INFO structure passed to
      it, we need to use a copy of LEX::create_info to make execution
      prepared statement- safe.
    */
    HA_CREATE_INFO create_info(lex->create_info);
3058 3059 3060 3061 3062
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
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3063
    char *alias;
3064 3065
    if (!(alias=thd->strmake(lex->name.str, lex->name.length)) ||
        check_db_name(&lex->name))
unknown's avatar
unknown committed
3066
    {
3067
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name.str);
unknown's avatar
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3068 3069
      break;
    }
3070 3071 3072
    /*
      If in a slave thread :
      CREATE DATABASE DB was certainly not preceded by USE DB.
3073
      For that reason, db_ok() in sql/slave.cc did not check the
3074 3075 3076
      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.
    */
3077
#ifdef HAVE_REPLICATION
unknown's avatar
unknown committed
3078
    if (thd->slave_thread && 
3079 3080
	(!rpl_filter->db_ok(lex->name.str) ||
	 !rpl_filter->db_ok_with_wild_table(lex->name.str)))
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unknown committed
3081
    {
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unknown committed
3082
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
3083
      break;
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unknown committed
3084
    }
3085
#endif
3086 3087
    if (check_access(thd,CREATE_ACL,lex->name.str, 0, 1, 0,
                     is_schema_db(lex->name.str)))
3088
      break;
3089
    res= mysql_create_db(thd,(lower_case_table_names == 2 ? alias :
3090
                              lex->name.str), &create_info, 0);
3091 3092
    break;
  }
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unknown committed
3093
  case SQLCOM_DROP_DB:
3094
  {
3095 3096 3097 3098 3099
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
3100
    if (check_db_name(&lex->name))
unknown's avatar
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3101
    {
3102
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name.str);
unknown's avatar
unknown committed
3103 3104
      break;
    }
3105 3106 3107 3108 3109 3110 3111
    /*
      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.
    */
3112
#ifdef HAVE_REPLICATION
3113
    if (thd->slave_thread && 
3114 3115
	(!rpl_filter->db_ok(lex->name.str) ||
	 !rpl_filter->db_ok_with_wild_table(lex->name.str)))
unknown's avatar
unknown committed
3116
    {
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unknown committed
3117
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
3118
      break;
unknown's avatar
unknown committed
3119
    }
3120
#endif
3121 3122
    if (check_access(thd,DROP_ACL,lex->name.str,0,1,0,
                     is_schema_db(lex->name.str)))
3123
      break;
3124 3125
    if (thd->locked_tables || thd->active_transaction())
    {
unknown's avatar
unknown committed
3126 3127
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3128 3129
      goto error;
    }
3130
    res= mysql_rm_db(thd, lex->name.str, lex->drop_if_exists, 0);
3131 3132
    break;
  }
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unknown committed
3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155
  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
3156 3157 3158 3159 3160
    if (check_db_name(newdb))
    {
      my_error(ER_WRONG_DB_NAME, MYF(0), newdb->str);
      break;
    }
unknown's avatar
unknown committed
3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179
    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;
  }
3180 3181
  case SQLCOM_ALTER_DB:
  {
3182
    LEX_STRING *db= &lex->name;
3183
    HA_CREATE_INFO create_info(lex->create_info);
3184
    if (check_db_name(db))
3185
    {
3186
      my_error(ER_WRONG_DB_NAME, MYF(0), db->str);
3187 3188
      break;
    }
unknown's avatar
unknown committed
3189 3190 3191
    /*
      If in a slave thread :
      ALTER DATABASE DB may not be preceded by USE DB.
3192
      For that reason, maybe db_ok() in sql/slave.cc did not check the
unknown's avatar
unknown committed
3193 3194 3195 3196
      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
3197
    if (thd->slave_thread &&
3198 3199
	(!rpl_filter->db_ok(db->str) ||
	 !rpl_filter->db_ok_with_wild_table(db->str)))
unknown's avatar
unknown committed
3200
    {
unknown's avatar
unknown committed
3201
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
unknown's avatar
unknown committed
3202 3203 3204
      break;
    }
#endif
3205
    if (check_access(thd, ALTER_ACL, db->str, 0, 1, 0, is_schema_db(db->str)))
3206 3207 3208
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
unknown's avatar
unknown committed
3209 3210
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3211 3212
      goto error;
    }
3213
    res= mysql_alter_db(thd, db->str, &create_info);
3214 3215
    break;
  }
unknown's avatar
unknown committed
3216 3217
  case SQLCOM_SHOW_CREATE_DB:
  {
3218
    if (check_db_name(&lex->name))
unknown's avatar
unknown committed
3219
    {
3220
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name.str);
unknown's avatar
unknown committed
3221 3222
      break;
    }
3223
    res= mysqld_show_create_db(thd, lex->name.str, &lex->create_info);
unknown's avatar
unknown committed
3224 3225
    break;
  }
unknown's avatar
unknown committed
3226 3227
  case SQLCOM_CREATE_EVENT:
  case SQLCOM_ALTER_EVENT:
3228
  do
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unknown committed
3229
  {
unknown's avatar
unknown committed
3230
    DBUG_ASSERT(lex->event_parse_data);
unknown's avatar
unknown committed
3231 3232 3233 3234 3235 3236
    if (lex->table_or_sp_used())
    {
      my_error(ER_NOT_SUPPORTED_YET, MYF(0), "Usage of subqueries or stored "
               "function calls as part of this statement");
      break;
    }
3237 3238 3239 3240 3241

    res= sp_process_definer(thd);
    if (res)
      break;

unknown's avatar
unknown committed
3242 3243
    switch (lex->sql_command) {
    case SQLCOM_CREATE_EVENT:
3244 3245 3246 3247
    {
      bool if_not_exists= (lex->create_info.options &
                           HA_LEX_CREATE_IF_NOT_EXISTS);
      res= Events::create_event(thd, lex->event_parse_data, if_not_exists);
unknown's avatar
unknown committed
3248
      break;
3249
    }
unknown's avatar
unknown committed
3250
    case SQLCOM_ALTER_EVENT:
3251 3252 3253
      res= Events::update_event(thd, lex->event_parse_data,
                                lex->spname ? &lex->spname->m_db : NULL,
                                lex->spname ? &lex->spname->m_name : NULL);
unknown's avatar
unknown committed
3254
      break;
3255 3256
    default:
      DBUG_ASSERT(0);
unknown's avatar
unknown committed
3257
    }
3258
    DBUG_PRINT("info",("DDL error code=%d", res));
unknown's avatar
unknown committed
3259
    if (!res)
3260
      send_ok(thd);
unknown's avatar
unknown committed
3261

3262 3263 3264 3265 3266 3267
  } while (0);
  /* Don't do it, if we are inside a SP */
  if (!thd->spcont)
  {
    delete lex->sphead;
    lex->sphead= NULL;
unknown's avatar
unknown committed
3268
  }
3269 3270
  /* lex->unit.cleanup() is called outside, no need to call it here */
  break;
unknown's avatar
unknown committed
3271
  case SQLCOM_SHOW_CREATE_EVENT:
3272 3273 3274 3275 3276 3277 3278 3279
    res= Events::show_create_event(thd, lex->spname->m_db,
                                   lex->spname->m_name);
    break;
  case SQLCOM_DROP_EVENT:
    if (!(res= Events::drop_event(thd,
                                  lex->spname->m_db, lex->spname->m_name,
                                  lex->drop_if_exists)))
      send_ok(thd);
3280
    break;
unknown's avatar
unknown committed
3281
  case SQLCOM_CREATE_FUNCTION:                  // UDF function
unknown's avatar
unknown committed
3282
  {
3283
    if (check_access(thd,INSERT_ACL,"mysql",0,1,0,0))
unknown's avatar
unknown committed
3284
      break;
unknown's avatar
unknown committed
3285
#ifdef HAVE_DLOPEN
3286 3287
    if (sp_find_routine(thd, TYPE_ENUM_FUNCTION, lex->spname,
                        &thd->sp_func_cache, FALSE))
unknown's avatar
unknown committed
3288
    {
3289
      my_error(ER_UDF_EXISTS, MYF(0), lex->spname->m_name.str);
unknown's avatar
unknown committed
3290 3291
      goto error;
    }
3292
    if (!(res = mysql_create_function(thd, &lex->udf)))
unknown's avatar
unknown committed
3293
      send_ok(thd);
unknown's avatar
unknown committed
3294
#else
unknown's avatar
unknown committed
3295
    my_error(ER_CANT_OPEN_LIBRARY, MYF(0), lex->udf.dl, 0, "feature disabled");
unknown's avatar
unknown committed
3296
    res= TRUE;
unknown's avatar
unknown committed
3297 3298
#endif
    break;
unknown's avatar
unknown committed
3299
  }
unknown's avatar
unknown committed
3300
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3301 3302
  case SQLCOM_CREATE_USER:
  {
3303
    if (check_access(thd, INSERT_ACL, "mysql", 0, 1, 1, 0) &&
3304
        check_global_access(thd,CREATE_USER_ACL))
3305
      break;
3306 3307
    if (end_active_trans(thd))
      goto error;
3308
    /* Conditionally writes to binlog */
3309 3310 3311 3312
    if (!(res= mysql_create_user(thd, lex->users_list)))
      send_ok(thd);
    break;
  }
3313 3314
  case SQLCOM_DROP_USER:
  {
3315
    if (check_access(thd, DELETE_ACL, "mysql", 0, 1, 1, 0) &&
3316
        check_global_access(thd,CREATE_USER_ACL))
3317
      break;
3318 3319
    if (end_active_trans(thd))
      goto error;
3320
    /* Conditionally writes to binlog */
3321
    if (!(res= mysql_drop_user(thd, lex->users_list)))
3322 3323 3324 3325 3326
      send_ok(thd);
    break;
  }
  case SQLCOM_RENAME_USER:
  {
3327
    if (check_access(thd, UPDATE_ACL, "mysql", 0, 1, 1, 0) &&
3328
        check_global_access(thd,CREATE_USER_ACL))
3329
      break;
3330 3331
    if (end_active_trans(thd))
      goto error;
3332
    /* Conditionally writes to binlog */
3333
    if (!(res= mysql_rename_user(thd, lex->users_list)))
3334 3335 3336 3337 3338
      send_ok(thd);
    break;
  }
  case SQLCOM_REVOKE_ALL:
  {
3339
    if (check_access(thd, UPDATE_ACL, "mysql", 0, 1, 1, 0) &&
3340
        check_global_access(thd,CREATE_USER_ACL))
3341
      break;
3342
    /* Conditionally writes to binlog */
3343 3344 3345 3346
    if (!(res = mysql_revoke_all(thd, lex->users_list)))
      send_ok(thd);
    break;
  }
3347 3348 3349 3350
  case SQLCOM_REVOKE:
  case SQLCOM_GRANT:
  {
    if (check_access(thd, lex->grant | lex->grant_tot_col | GRANT_ACL,
unknown's avatar
unknown committed
3351
		     first_table ?  first_table->db : select_lex->db,
unknown's avatar
VIEW  
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3352
		     first_table ? &first_table->grant.privilege : 0,
3353 3354 3355
		     first_table ? 0 : 1, 0,
                     first_table ? (bool) first_table->schema_table :
                     select_lex->db ? is_schema_db(select_lex->db) : 0))
3356 3357
      goto error;

3358
    if (thd->security_ctx->user)              // If not replication
unknown's avatar
unknown committed
3359
    {
3360
      LEX_USER *user, *tmp_user;
3361

unknown's avatar
unknown committed
3362
      List_iterator <LEX_USER> user_list(lex->users_list);
3363
      while ((tmp_user= user_list++))
unknown's avatar
unknown committed
3364
      {
3365 3366
        if (!(user= get_current_user(thd, tmp_user)))
          goto error;
3367 3368 3369 3370 3371 3372 3373 3374
        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);
3375
        if (strcmp(thd->security_ctx->user, user->user.str) ||
3376
            my_strcasecmp(system_charset_info,
3377
                          user->host.str, thd->security_ctx->host_or_ip))
3378 3379
        {
          // TODO: use check_change_password()
3380 3381
          if (is_acl_user(user->host.str, user->user.str) &&
              user->password.str &&
3382
              check_access(thd, UPDATE_ACL,"mysql",0,1,1,0))
3383 3384 3385 3386 3387 3388
          {
            my_message(ER_PASSWORD_NOT_ALLOWED,
                       ER(ER_PASSWORD_NOT_ALLOWED), MYF(0));
            goto error;
          }
        }
unknown's avatar
SCRUM  
unknown committed
3389 3390
      }
    }
unknown's avatar
VIEW  
unknown committed
3391
    if (first_table)
3392
    {
3393 3394
      if (lex->type == TYPE_ENUM_PROCEDURE ||
          lex->type == TYPE_ENUM_FUNCTION)
3395 3396 3397 3398
      {
        uint grants= lex->all_privileges 
		   ? (PROC_ACLS & ~GRANT_ACL) | (lex->grant & GRANT_ACL)
		   : lex->grant;
3399
        if (check_grant_routine(thd, grants | GRANT_ACL, all_tables,
3400
                                lex->type == TYPE_ENUM_PROCEDURE, 0))
3401
	  goto error;
3402
        /* Conditionally writes to binlog */
3403 3404 3405 3406
        res= mysql_routine_grant(thd, all_tables,
                                 lex->type == TYPE_ENUM_PROCEDURE, 
                                 lex->users_list, grants,
                                 lex->sql_command == SQLCOM_REVOKE, 0);
3407 3408 3409
      }
      else
      {
3410 3411
	if (check_grant(thd,(lex->grant | lex->grant_tot_col | GRANT_ACL),
                        all_tables, 0, UINT_MAX, 0))
3412
	  goto error;
3413
        /* Conditionally writes to binlog */
3414 3415 3416 3417
        res= mysql_table_grant(thd, all_tables, lex->users_list,
			       lex->columns, lex->grant,
			       lex->sql_command == SQLCOM_REVOKE);
      }
3418 3419 3420
    }
    else
    {
3421
      if (lex->columns.elements || lex->type)
3422
      {
unknown's avatar
unknown committed
3423 3424
	my_message(ER_ILLEGAL_GRANT_FOR_TABLE, ER(ER_ILLEGAL_GRANT_FOR_TABLE),
                   MYF(0));
unknown's avatar
unknown committed
3425
        goto error;
3426 3427
      }
      else
3428
	/* Conditionally writes to binlog */
3429 3430 3431 3432
	res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
			  lex->sql_command == SQLCOM_REVOKE);
      if (!res)
      {
3433
	if (lex->sql_command == SQLCOM_GRANT)
3434
	{
unknown's avatar
unknown committed
3435
	  List_iterator <LEX_USER> str_list(lex->users_list);
3436 3437 3438 3439 3440
	  LEX_USER *user, *tmp_user;
	  while ((tmp_user=str_list++))
          {
            if (!(user= get_current_user(thd, tmp_user)))
              goto error;
3441
	    reset_mqh(user, 0);
3442
          }
3443
	}
3444 3445 3446 3447
      }
    }
    break;
  }
unknown's avatar
SCRUM  
unknown committed
3448
#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/
unknown's avatar
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3449
  case SQLCOM_RESET:
3450 3451 3452
    /*
      RESET commands are never written to the binary log, so we have to
      initialize this variable because RESET shares the same code as FLUSH
3453 3454 3455 3456
    */
    lex->no_write_to_binlog= 1;
  case SQLCOM_FLUSH:
  {
unknown's avatar
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3457
    bool write_to_binlog;
unknown's avatar
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3458
    if (check_global_access(thd,RELOAD_ACL))
unknown's avatar
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3459
      goto error;
3460

3461 3462 3463 3464
    /*
      reload_acl_and_cache() will tell us if we are allowed to write to the
      binlog or not.
    */
unknown's avatar
unknown committed
3465
    if (!reload_acl_and_cache(thd, lex->type, first_table, &write_to_binlog))
3466 3467 3468 3469 3470
    {
      /*
        We WANT to write and we CAN write.
        ! we write after unlocking the table.
      */
3471 3472 3473
      /*
        Presumably, RESET and binlog writing doesn't require synchronization
      */
3474 3475 3476 3477
      if (!lex->no_write_to_binlog && write_to_binlog)
      {
        if (mysql_bin_log.is_open())
        {
unknown's avatar
unknown committed
3478 3479
          thd->binlog_query(THD::STMT_QUERY_TYPE,
                            thd->query, thd->query_length, 0, FALSE);
3480 3481 3482
        }
      }
      send_ok(thd);
3483 3484
    } 
    
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3485
    break;
3486
  }
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3487
  case SQLCOM_KILL:
3488 3489 3490
  {
    Item *it= (Item *)lex->value_list.head();

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3491 3492 3493 3494 3495 3496 3497
    if (lex->table_or_sp_used())
    {
      my_error(ER_NOT_SUPPORTED_YET, MYF(0), "Usage of subqueries or stored "
               "function calls as part of this statement");
      break;
    }

3498
    if ((!it->fixed && it->fix_fields(lex->thd, &it)) || it->check_cols(1))
3499 3500 3501 3502 3503
    {
      my_message(ER_SET_CONSTANTS_ONLY, ER(ER_SET_CONSTANTS_ONLY),
		 MYF(0));
      goto error;
    }
3504
    sql_kill(thd, (ulong)it->val_int(), lex->type & ONLY_KILL_QUERY);
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3505
    break;
3506
  }
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3507
#ifndef NO_EMBEDDED_ACCESS_CHECKS
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3508
  case SQLCOM_SHOW_GRANTS:
3509 3510 3511 3512
  {
    LEX_USER *grant_user= get_current_user(thd, lex->grant_user);
    if (!grant_user)
      goto error;
3513
    if ((thd->security_ctx->priv_user &&
3514
	 !strcmp(thd->security_ctx->priv_user, grant_user->user.str)) ||
3515
	!check_access(thd, SELECT_ACL, "mysql",0,1,0,0))
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3516
    {
3517
      res = mysql_show_grants(thd, grant_user);
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3518 3519
    }
    break;
3520
  }
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3521
#endif
3522
  case SQLCOM_HA_OPEN:
unknown's avatar
VIEW  
unknown committed
3523
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
unknown's avatar
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3524
    if (check_table_access(thd, SELECT_ACL, all_tables, 0))
3525
      goto error;
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3526
    res= mysql_ha_open(thd, first_table, 0);
3527 3528
    break;
  case SQLCOM_HA_CLOSE:
unknown's avatar
VIEW  
unknown committed
3529 3530
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    res= mysql_ha_close(thd, first_table);
3531 3532
    break;
  case SQLCOM_HA_READ:
unknown's avatar
VIEW  
unknown committed
3533
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3534 3535 3536 3537 3538
    /*
      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.
    */
3539
    unit->set_limit(select_lex);
3540
    res= mysql_ha_read(thd, first_table, lex->ha_read_mode, lex->ident.str,
unknown's avatar
VIEW  
unknown committed
3541
                       lex->insert_list, lex->ha_rkey_mode, select_lex->where,
3542
                       unit->select_limit_cnt, unit->offset_limit_cnt);
3543 3544
    break;

unknown's avatar
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3545
  case SQLCOM_BEGIN:
3546 3547 3548 3549 3550 3551
    if (thd->transaction.xid_state.xa_state != XA_NOTR)
    {
      my_error(ER_XAER_RMFAIL, MYF(0),
               xa_state_names[thd->transaction.xid_state.xa_state]);
      break;
    }
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3552
    if (begin_trans(thd))
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3553
      goto error;
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3554
    send_ok(thd);
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3555 3556
    break;
  case SQLCOM_COMMIT:
3557
    if (end_trans(thd, lex->tx_release ? COMMIT_RELEASE :
unknown's avatar
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3558
                              lex->tx_chain ? COMMIT_AND_CHAIN : COMMIT))
unknown's avatar
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3559
      goto error;
3560
    send_ok(thd);
unknown's avatar
unknown committed
3561 3562
    break;
  case SQLCOM_ROLLBACK:
3563
    if (end_trans(thd, lex->tx_release ? ROLLBACK_RELEASE :
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3564
                              lex->tx_chain ? ROLLBACK_AND_CHAIN : ROLLBACK))
unknown's avatar
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3565
      goto error;
3566
    send_ok(thd);
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3567
    break;
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3568
  case SQLCOM_RELEASE_SAVEPOINT:
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3569
  {
3570 3571
    SAVEPOINT *sv;
    for (sv=thd->transaction.savepoints; sv; sv=sv->prev)
unknown's avatar
unknown committed
3572 3573 3574
    {
      if (my_strnncoll(system_charset_info,
                       (uchar *)lex->ident.str, lex->ident.length,
3575
                       (uchar *)sv->name, sv->length) == 0)
unknown's avatar
unknown committed
3576 3577
        break;
    }
3578
    if (sv)
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3579
    {
3580
      if (ha_release_savepoint(thd, sv))
unknown's avatar
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3581
        res= TRUE; // cannot happen
unknown's avatar
unknown committed
3582 3583
      else
        send_ok(thd);
3584
      thd->transaction.savepoints=sv->prev;
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unknown committed
3585
    }
3586
    else
unknown's avatar
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3587
      my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str);
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3588
    break;
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3589
  }
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3590
  case SQLCOM_ROLLBACK_TO_SAVEPOINT:
unknown's avatar
unknown committed
3591
  {
3592 3593
    SAVEPOINT *sv;
    for (sv=thd->transaction.savepoints; sv; sv=sv->prev)
3594 3595 3596
    {
      if (my_strnncoll(system_charset_info,
                       (uchar *)lex->ident.str, lex->ident.length,
3597
                       (uchar *)sv->name, sv->length) == 0)
3598 3599
        break;
    }
3600
    if (sv)
3601
    {
3602
      if (ha_rollback_to_savepoint(thd, sv))
3603 3604
        res= TRUE; // cannot happen
      else
unknown's avatar
unknown committed
3605
      {
3606
        if (((thd->options & OPTION_KEEP_LOG) || thd->no_trans_update.all) &&
unknown's avatar
unknown committed
3607 3608 3609 3610 3611 3612
            !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);
      }
3613
      thd->transaction.savepoints=sv;
unknown's avatar
unknown committed
3614 3615
    }
    else
3616
      my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str);
unknown's avatar
unknown committed
3617
    break;
3618
  }
3619
  case SQLCOM_SAVEPOINT:
3620 3621
    if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN) ||
          thd->in_sub_stmt) || !opt_using_transactions)
unknown's avatar
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3622
      send_ok(thd);
unknown's avatar
unknown committed
3623
    else
3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661
    {
      SAVEPOINT **sv, *newsv;
      for (sv=&thd->transaction.savepoints; *sv; sv=&(*sv)->prev)
      {
        if (my_strnncoll(system_charset_info,
                         (uchar *)lex->ident.str, lex->ident.length,
                         (uchar *)(*sv)->name, (*sv)->length) == 0)
          break;
      }
      if (*sv) /* old savepoint of the same name exists */
      {
        newsv=*sv;
        ha_release_savepoint(thd, *sv); // it cannot fail
        *sv=(*sv)->prev;
      }
      else if ((newsv=(SAVEPOINT *) alloc_root(&thd->transaction.mem_root,
                                               savepoint_alloc_size)) == 0)
      {
        my_error(ER_OUT_OF_RESOURCES, MYF(0));
        break;
      }
      newsv->name=strmake_root(&thd->transaction.mem_root,
                               lex->ident.str, lex->ident.length);
      newsv->length=lex->ident.length;
      /*
        if we'll get an error here, don't add new savepoint to the list.
        we'll lose a little bit of memory in transaction mem_root, but it'll
        be free'd when transaction ends anyway
      */
      if (ha_savepoint(thd, newsv))
        res= TRUE;
      else
      {
        newsv->prev=thd->transaction.savepoints;
        thd->transaction.savepoints=newsv;
        send_ok(thd);
      }
    }
unknown's avatar
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3662
    break;
3663 3664
  case SQLCOM_CREATE_PROCEDURE:
  case SQLCOM_CREATE_SPFUNCTION:
unknown's avatar
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3665
  {
3666
    uint namelen;
unknown's avatar
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3667
    char *name;
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3668
    int sp_result= SP_INTERNAL_ERROR;
3669

3670
    DBUG_ASSERT(lex->sphead != 0);
unknown's avatar
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3671
    DBUG_ASSERT(lex->sphead->m_db.str); /* Must be initialized in the parser */
3672 3673 3674 3675
    /*
      Verify that the database name is allowed, optionally
      lowercase it.
    */
3676
    if (check_db_name(&lex->sphead->m_db))
3677
    {
3678
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->sphead->m_db.str);
3679
      goto create_sp_error;
3680 3681
    }

3682
    /*
3683 3684 3685
      Check that a database directory with this name
      exists. Design note: This won't work on virtual databases
      like information_schema.
3686 3687
    */
    if (check_db_dir_existence(lex->sphead->m_db.str))
3688
    {
3689
      my_error(ER_BAD_DB_ERROR, MYF(0), lex->sphead->m_db.str);
3690
      goto create_sp_error;
3691
    }
3692

3693 3694
    if (check_access(thd, CREATE_PROC_ACL, lex->sphead->m_db.str, 0, 0, 0,
                     is_schema_db(lex->sphead->m_db.str)))
3695
      goto create_sp_error;
3696

3697 3698
    if (end_active_trans(thd))
      goto create_sp_error;
3699 3700

    name= lex->sphead->name(&namelen);
3701
#ifdef HAVE_DLOPEN
unknown's avatar
unknown committed
3702 3703 3704
    if (lex->sphead->m_type == TYPE_ENUM_FUNCTION)
    {
      udf_func *udf = find_udf(name, namelen);
3705

unknown's avatar
unknown committed
3706
      if (udf)
3707
      {
3708 3709
        my_error(ER_UDF_EXISTS, MYF(0), name);
        goto create_sp_error;
3710
      }
unknown's avatar
unknown committed
3711 3712 3713
    }
#endif

3714 3715
    if (sp_process_definer(thd))
      goto create_sp_error;
3716

unknown's avatar
unknown committed
3717 3718
    res= (sp_result= lex->sphead->create(thd));
    switch (sp_result) {
3719
    case SP_OK:
unknown's avatar
unknown committed
3720
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3721
      /* only add privileges if really neccessary */
3722
      if (sp_automatic_privileges && !opt_noacl &&
3723
          check_routine_access(thd, DEFAULT_CREATE_PROC_ACLS,
3724
                               lex->sphead->m_db.str, name,
3725
                               lex->sql_command == SQLCOM_CREATE_PROCEDURE, 1))
3726
      {
unknown's avatar
unknown committed
3727
        if (sp_grant_privileges(thd, lex->sphead->m_db.str, name,
3728
                                lex->sql_command == SQLCOM_CREATE_PROCEDURE))
3729 3730 3731
          push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                       ER_PROC_AUTO_GRANT_FAIL,
                       ER(ER_PROC_AUTO_GRANT_FAIL));
unknown's avatar
unknown committed
3732
        close_thread_tables(thd);
3733
      }
unknown's avatar
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3734
#endif
unknown's avatar
unknown committed
3735
    break;
3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754
    case SP_WRITE_ROW_FAILED:
      my_error(ER_SP_ALREADY_EXISTS, MYF(0), SP_TYPE_STRING(lex), name);
    break;
    case SP_BAD_IDENTIFIER:
      my_error(ER_TOO_LONG_IDENT, MYF(0), name);
    break;
    case SP_BODY_TOO_LONG:
      my_error(ER_TOO_LONG_BODY, MYF(0), name);
    break;
    default:
      my_error(ER_SP_STORE_FAILED, MYF(0), SP_TYPE_STRING(lex), name);
    break;
    } /* end switch */

    /*
      Capture all errors within this CASE and
      clean up the environment.
    */
create_sp_error:
unknown's avatar
unknown committed
3755
    if (sp_result != SP_OK )
3756 3757 3758 3759
      goto error;
    send_ok(thd);
    break; /* break super switch */
  } /* end case group bracket */
3760 3761 3762 3763
  case SQLCOM_CALL:
    {
      sp_head *sp;

3764 3765 3766 3767 3768 3769 3770 3771 3772
      /*
        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;

      /*
3773 3774
        By this moment all needed SPs should be in cache so no need to look 
        into DB. 
3775
      */
3776 3777
      if (!(sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname,
                                &thd->sp_proc_cache, TRUE)))
3778
      {
3779
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "PROCEDURE",
unknown's avatar
unknown committed
3780
                 lex->spname->m_qname.str);
3781
	goto error;
3782 3783 3784
      }
      else
      {
unknown's avatar
unknown committed
3785
	ha_rows select_limit;
unknown's avatar
unknown committed
3786 3787
        /* bits that should be cleared in thd->server_status */
	uint bits_to_be_cleared= 0;
3788 3789 3790 3791 3792 3793 3794 3795 3796 3797 3798 3799
        /*
          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;
        }
3800

3801
	my_bool save_no_send_ok= thd->net.no_send_ok;
3802
	thd->net.no_send_ok= TRUE;
3803
	if (sp->m_flags & sp_head::MULTI_RESULTS)
3804
	{
3805
	  if (! (thd->client_capabilities & CLIENT_MULTI_RESULTS))
3806
	  {
3807 3808 3809 3810
            /*
              The client does not support multiple result sets being sent
              back
            */
3811
	    my_error(ER_SP_BADSELECT, MYF(0), sp->m_qname.str);
3812
	    thd->net.no_send_ok= save_no_send_ok;
3813 3814
	    goto error;
	  }
unknown's avatar
unknown committed
3815 3816 3817 3818 3819 3820 3821
          /*
            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;
3822 3823
	}

3824
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3825
	if (check_routine_access(thd, EXECUTE_ACL,
3826
				 sp->m_db.str, sp->m_name.str, TRUE, FALSE))
3827
	{
3828
	  thd->net.no_send_ok= save_no_send_ok;
3829 3830
	  goto error;
	}
3831
#endif
unknown's avatar
unknown committed
3832 3833
	select_limit= thd->variables.select_limit;
	thd->variables.select_limit= HA_POS_ERROR;
3834

3835
        /* 
3836
          We never write CALL statements into binlog:
3837 3838 3839 3840 3841
           - 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.
3842
        */
3843
	res= sp->execute_procedure(thd, &lex->value_list);
3844 3845 3846
	/*
          If warnings have been cleared, we have to clear total_warn_count
          too, otherwise the clients get confused.
3847 3848 3849 3850
	 */
	if (thd->warn_list.is_empty())
	  thd->total_warn_count= 0;

unknown's avatar
unknown committed
3851
	thd->variables.select_limit= select_limit;
3852

3853
	thd->net.no_send_ok= save_no_send_ok;
unknown's avatar
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3854
        thd->server_status&= ~bits_to_be_cleared;
3855

unknown's avatar
unknown committed
3856
	if (!res)
unknown's avatar
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3857 3858
	  send_ok(thd, (ulong) (thd->row_count_func < 0 ? 0 :
                                thd->row_count_func));
3859
	else
3860 3861
        {
          DBUG_ASSERT(thd->net.report_error == 1 || thd->killed);
3862
	  goto error;		// Substatement should already have sent error
3863
        }
3864
      }
3865
      break;
3866 3867
    }
  case SQLCOM_ALTER_PROCEDURE:
3868
  case SQLCOM_ALTER_FUNCTION:
3869
    {
unknown's avatar
unknown committed
3870
      int sp_result;
3871 3872 3873 3874
      sp_head *sp;
      st_sp_chistics chistics;

      memcpy(&chistics, &lex->sp_chistics, sizeof(chistics));
unknown's avatar
unknown committed
3875
      if (lex->sql_command == SQLCOM_ALTER_PROCEDURE)
3876 3877
        sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname,
                            &thd->sp_proc_cache, FALSE);
3878
      else
3879 3880
        sp= sp_find_routine(thd, TYPE_ENUM_FUNCTION, lex->spname,
                            &thd->sp_func_cache, FALSE);
unknown's avatar
unknown committed
3881
      mysql_reset_errors(thd, 0);
3882
      if (! sp)
3883 3884
      {
	if (lex->spname->m_db.str)
unknown's avatar
unknown committed
3885
	  sp_result= SP_KEY_NOT_FOUND;
3886 3887 3888 3889 3890 3891
	else
	{
	  my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
	  goto error;
	}
      }
3892 3893
      else
      {
3894 3895 3896
        if (check_routine_access(thd, ALTER_PROC_ACL, sp->m_db.str, 
				 sp->m_name.str,
                                 lex->sql_command == SQLCOM_ALTER_PROCEDURE, 0))
3897
	  goto error;
3898 3899 3900

        if (end_active_trans(thd)) 
          goto error;
3901
	memcpy(&lex->sp_chistics, &chistics, sizeof(lex->sp_chistics));
3902 3903
        if ((sp->m_type == TYPE_ENUM_FUNCTION) &&
            !trust_function_creators &&  mysql_bin_log.is_open() &&
3904 3905 3906 3907 3908 3909
            !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));
unknown's avatar
unknown committed
3910
          sp_result= SP_INTERNAL_ERROR;
3911 3912 3913
        }
        else
        {
3914 3915 3916 3917 3918 3919
          /*
            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.
          */
unknown's avatar
unknown committed
3920
          /* Conditionally writes to binlog */
unknown's avatar
unknown committed
3921 3922 3923 3924 3925 3926 3927 3928 3929

          int type= lex->sql_command == SQLCOM_ALTER_PROCEDURE ?
                    TYPE_ENUM_PROCEDURE :
                    TYPE_ENUM_FUNCTION;

          sp_result= sp_update_routine(thd,
                                       type,
                                       lex->spname,
                                       &lex->sp_chistics);
3930
        }
3931
      }
unknown's avatar
unknown committed
3932
      switch (sp_result)
3933
      {
unknown's avatar
unknown committed
3934
      case SP_OK:
3935
	send_ok(thd);
unknown's avatar
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3936 3937
	break;
      case SP_KEY_NOT_FOUND:
3938 3939
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
unknown's avatar
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3940 3941
	goto error;
      default:
3942 3943
	my_error(ER_SP_CANT_ALTER, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
unknown's avatar
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3944
	goto error;
3945
      }
3946
      break;
3947 3948
    }
  case SQLCOM_DROP_PROCEDURE:
3949
  case SQLCOM_DROP_FUNCTION:
3950
    {
unknown's avatar
unknown committed
3951
      int sp_result;
3952 3953
      int type= (lex->sql_command == SQLCOM_DROP_PROCEDURE ?
                 TYPE_ENUM_PROCEDURE : TYPE_ENUM_FUNCTION);
3954

unknown's avatar
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3955
      sp_result= sp_routine_exists_in_table(thd, type, lex->spname);
unknown's avatar
unknown committed
3956
      mysql_reset_errors(thd, 0);
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3957
      if (sp_result == SP_OK)
3958
      {
3959 3960 3961
        char *db= lex->spname->m_db.str;
	char *name= lex->spname->m_name.str;

3962 3963
	if (check_routine_access(thd, ALTER_PROC_ACL, db, name,
                                 lex->sql_command == SQLCOM_DROP_PROCEDURE, 0))
unknown's avatar
merge  
unknown committed
3964
          goto error;
3965 3966 3967

        if (end_active_trans(thd)) 
          goto error;
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3968
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3969
	if (sp_automatic_privileges && !opt_noacl &&
3970 3971
	    sp_revoke_privileges(thd, db, name, 
                                 lex->sql_command == SQLCOM_DROP_PROCEDURE))
3972 3973 3974 3975 3976
	{
	  push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 
		       ER_PROC_AUTO_REVOKE_FAIL,
		       ER(ER_PROC_AUTO_REVOKE_FAIL));
	}
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3977
#endif
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3978
        /* Conditionally writes to binlog */
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3979 3980 3981 3982 3983 3984

        int type= lex->sql_command == SQLCOM_DROP_PROCEDURE ?
                  TYPE_ENUM_PROCEDURE :
                  TYPE_ENUM_FUNCTION;

        sp_result= sp_drop_routine(thd, type, lex->spname);
3985 3986 3987
      }
      else
      {
3988
#ifdef HAVE_DLOPEN
3989 3990 3991 3992 3993 3994
	if (lex->sql_command == SQLCOM_DROP_FUNCTION)
	{
          udf_func *udf = find_udf(lex->spname->m_name.str,
                                   lex->spname->m_name.length);
          if (udf)
          {
3995
	    if (check_access(thd, DELETE_ACL, "mysql", 0, 1, 0, 0))
3996
	      goto error;
3997

3998
	    if (!(res = mysql_drop_function(thd, &lex->spname->m_name)))
3999
	    {
4000 4001
	      send_ok(thd);
	      break;
4002 4003
	    }
	  }
4004
	}
4005
#endif
4006
	if (lex->spname->m_db.str)
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4007
	  sp_result= SP_KEY_NOT_FOUND;
4008 4009 4010 4011 4012
	else
	{
	  my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
	  goto error;
	}
4013
      }
unknown's avatar
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4014 4015
      res= sp_result;
      switch (sp_result) {
4016
      case SP_OK:
4017
	send_ok(thd);
4018 4019
	break;
      case SP_KEY_NOT_FOUND:
4020 4021
	if (lex->drop_if_exists)
	{
4022
	  push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
4023
			      ER_SP_DOES_NOT_EXIST, ER(ER_SP_DOES_NOT_EXIST),
4024
			      SP_COM_STRING(lex), lex->spname->m_name.str);
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4025
	  res= FALSE;
4026 4027 4028
	  send_ok(thd);
	  break;
	}
4029 4030
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4031 4032
	goto error;
      default:
4033 4034
	my_error(ER_SP_DROP_FAILED, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4035
	goto error;
4036
      }
4037
      break;
4038
    }
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4039 4040
  case SQLCOM_SHOW_CREATE_PROC:
    {
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4041 4042
      if (sp_show_create_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname))
      {
4043 4044
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
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4045 4046 4047 4048 4049 4050
	goto error;
      }
      break;
    }
  case SQLCOM_SHOW_CREATE_FUNC:
    {
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4051 4052
      if (sp_show_create_routine(thd, TYPE_ENUM_FUNCTION, lex->spname))
      {
4053 4054
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
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4055 4056 4057 4058
	goto error;
      }
      break;
    }
4059
#ifdef NOT_USED
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4060 4061
  case SQLCOM_SHOW_STATUS_PROC:
    {
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4062 4063
      res= sp_show_status_routine(thd, TYPE_ENUM_PROCEDURE,
                                  (lex->wild ? lex->wild->ptr() : NullS));
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4064 4065 4066 4067
      break;
    }
  case SQLCOM_SHOW_STATUS_FUNC:
    {
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4068 4069
      res= sp_show_status_routine(thd, TYPE_ENUM_FUNCTION,
                                  (lex->wild ? lex->wild->ptr() : NullS));
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4070 4071
      break;
    }
4072
#endif
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4073 4074 4075 4076 4077 4078 4079
#ifndef DBUG_OFF
  case SQLCOM_SHOW_PROC_CODE:
  case SQLCOM_SHOW_FUNC_CODE:
    {
      sp_head *sp;

      if (lex->sql_command == SQLCOM_SHOW_PROC_CODE)
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4080 4081
        sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname,
                            &thd->sp_proc_cache, FALSE);
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4082
      else
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4083 4084
        sp= sp_find_routine(thd, TYPE_ENUM_FUNCTION, lex->spname,
                            &thd->sp_func_cache, FALSE);
4085
      if (!sp || sp->show_routine_code(thd))
4086 4087
      {
        /* We don't distinguish between errors for now */
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4088 4089 4090 4091 4092 4093 4094
        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
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VIEW  
unknown committed
4095 4096
  case SQLCOM_CREATE_VIEW:
    {
4097 4098 4099
      if (end_active_trans(thd))
        goto error;

4100
      res= mysql_create_view(thd, first_table, thd->lex->create_view_mode);
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VIEW  
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4101 4102 4103 4104
      break;
    }
  case SQLCOM_DROP_VIEW:
    {
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4105 4106 4107
      if (check_table_access(thd, DROP_ACL, all_tables, 0) ||
          end_active_trans(thd))
        goto error;
4108 4109
      /* Conditionally writes to binlog. */
      res= mysql_drop_view(thd, first_table, thd->lex->drop_mode);
unknown's avatar
VIEW  
unknown committed
4110 4111
      break;
    }
4112 4113
  case SQLCOM_CREATE_TRIGGER:
  {
4114 4115 4116
    if (end_active_trans(thd))
      goto error;

4117
    /* Conditionally writes to binlog. */
4118 4119
    res= mysql_create_or_drop_trigger(thd, all_tables, 1);

4120 4121 4122 4123
    break;
  }
  case SQLCOM_DROP_TRIGGER:
  {
4124 4125 4126
    if (end_active_trans(thd))
      goto error;

4127
    /* Conditionally writes to binlog. */
4128 4129 4130
    res= mysql_create_or_drop_trigger(thd, all_tables, 0);
    break;
  }
4131
  case SQLCOM_XA_START:
4132 4133
    if (thd->transaction.xid_state.xa_state == XA_IDLE &&
        thd->lex->xa_opt == XA_RESUME)
4134
    {
4135
      if (! thd->transaction.xid_state.xid.eq(thd->lex->xid))
4136 4137 4138 4139
      {
        my_error(ER_XAER_NOTA, MYF(0));
        break;
      }
4140
      thd->transaction.xid_state.xa_state=XA_ACTIVE;
4141 4142 4143
      send_ok(thd);
      break;
    }
unknown's avatar
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4144
    if (thd->lex->xa_opt != XA_NONE)
4145 4146 4147 4148
    { // JOIN is not supported yet. TODO
      my_error(ER_XAER_INVAL, MYF(0));
      break;
    }
4149
    if (thd->transaction.xid_state.xa_state != XA_NOTR)
4150
    {
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4151
      my_error(ER_XAER_RMFAIL, MYF(0),
4152
               xa_state_names[thd->transaction.xid_state.xa_state]);
4153 4154 4155 4156 4157 4158 4159
      break;
    }
    if (thd->active_transaction() || thd->locked_tables)
    {
      my_error(ER_XAER_OUTSIDE, MYF(0));
      break;
    }
4160 4161 4162 4163 4164 4165 4166 4167 4168
    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);
4169
    thd->options= ((thd->options & ~(OPTION_KEEP_LOG)) | OPTION_BEGIN);
4170
    thd->no_trans_update.all= FALSE;
4171 4172 4173 4174 4175 4176 4177 4178 4179 4180
    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;
    }
4181
    if (thd->transaction.xid_state.xa_state != XA_ACTIVE)
4182
    {
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unknown committed
4183
      my_error(ER_XAER_RMFAIL, MYF(0),
4184
               xa_state_names[thd->transaction.xid_state.xa_state]);
4185 4186
      break;
    }
4187
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
4188 4189 4190 4191
    {
      my_error(ER_XAER_NOTA, MYF(0));
      break;
    }
4192
    thd->transaction.xid_state.xa_state=XA_IDLE;
4193 4194 4195
    send_ok(thd);
    break;
  case SQLCOM_XA_PREPARE:
4196
    if (thd->transaction.xid_state.xa_state != XA_IDLE)
4197
    {
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unknown committed
4198
      my_error(ER_XAER_RMFAIL, MYF(0),
4199
               xa_state_names[thd->transaction.xid_state.xa_state]);
4200 4201
      break;
    }
4202
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
4203 4204 4205 4206 4207 4208 4209
    {
      my_error(ER_XAER_NOTA, MYF(0));
      break;
    }
    if (ha_prepare(thd))
    {
      my_error(ER_XA_RBROLLBACK, MYF(0));
4210 4211
      xid_cache_delete(&thd->transaction.xid_state);
      thd->transaction.xid_state.xa_state=XA_NOTR;
4212 4213
      break;
    }
4214
    thd->transaction.xid_state.xa_state=XA_PREPARED;
4215 4216 4217
    send_ok(thd);
    break;
  case SQLCOM_XA_COMMIT:
4218
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
4219
    {
4220 4221
      XID_STATE *xs=xid_cache_search(thd->lex->xid);
      if (!xs || xs->in_thd)
4222
        my_error(ER_XAER_NOTA, MYF(0));
unknown's avatar
unknown committed
4223
      else
4224 4225 4226
      {
        ha_commit_or_rollback_by_xid(thd->lex->xid, 1);
        xid_cache_delete(xs);
unknown's avatar
unknown committed
4227
        send_ok(thd);
4228
      }
4229 4230
      break;
    }
4231
    if (thd->transaction.xid_state.xa_state == XA_IDLE &&
unknown's avatar
unknown committed
4232
        thd->lex->xa_opt == XA_ONE_PHASE)
4233
    {
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4234 4235 4236
      int r;
      if ((r= ha_commit(thd)))
        my_error(r == 1 ? ER_XA_RBROLLBACK : ER_XAER_RMERR, MYF(0));
4237 4238 4239
      else
        send_ok(thd);
    }
4240
    else if (thd->transaction.xid_state.xa_state == XA_PREPARED &&
unknown's avatar
unknown committed
4241
             thd->lex->xa_opt == XA_NONE)
4242
    {
4243 4244 4245
      if (wait_if_global_read_lock(thd, 0, 0))
      {
        ha_rollback(thd);
4246
        my_error(ER_XAER_RMERR, MYF(0));
4247
      }
4248
      else
4249 4250 4251 4252 4253 4254 4255
      {
        if (ha_commit_one_phase(thd, 1))
          my_error(ER_XAER_RMERR, MYF(0));
        else
          send_ok(thd);
        start_waiting_global_read_lock(thd);
      }
4256 4257 4258
    }
    else
    {
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4259
      my_error(ER_XAER_RMFAIL, MYF(0),
4260
               xa_state_names[thd->transaction.xid_state.xa_state]);
4261 4262
      break;
    }
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4263 4264
    thd->options&= ~(OPTION_BEGIN | OPTION_KEEP_LOG);
    thd->no_trans_update.all= FALSE;
4265
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
4266 4267
    xid_cache_delete(&thd->transaction.xid_state);
    thd->transaction.xid_state.xa_state=XA_NOTR;
4268 4269
    break;
  case SQLCOM_XA_ROLLBACK:
4270
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
4271
    {
4272 4273
      XID_STATE *xs=xid_cache_search(thd->lex->xid);
      if (!xs || xs->in_thd)
4274
        my_error(ER_XAER_NOTA, MYF(0));
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unknown committed
4275
      else
4276 4277 4278
      {
        ha_commit_or_rollback_by_xid(thd->lex->xid, 0);
        xid_cache_delete(xs);
unknown's avatar
unknown committed
4279
        send_ok(thd);
4280
      }
4281 4282
      break;
    }
4283 4284
    if (thd->transaction.xid_state.xa_state != XA_IDLE &&
        thd->transaction.xid_state.xa_state != XA_PREPARED)
4285
    {
unknown's avatar
unknown committed
4286
      my_error(ER_XAER_RMFAIL, MYF(0),
4287
               xa_state_names[thd->transaction.xid_state.xa_state]);
4288 4289 4290 4291 4292 4293
      break;
    }
    if (ha_rollback(thd))
      my_error(ER_XAER_RMERR, MYF(0));
    else
      send_ok(thd);
4294
    thd->options&= ~(OPTION_BEGIN | OPTION_KEEP_LOG);
4295
    thd->no_trans_update.all= FALSE;
4296
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
4297 4298
    xid_cache_delete(&thd->transaction.xid_state);
    thd->transaction.xid_state.xa_state=XA_NOTR;
4299 4300
    break;
  case SQLCOM_XA_RECOVER:
4301
    res= mysql_xa_recover(thd);
4302
    break;
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4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326
  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;
  }
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4327 4328 4329 4330 4331
  case SQLCOM_CREATE_SERVER:
  {
    int error;
    LEX *lex= thd->lex;
    DBUG_PRINT("info", ("case SQLCOM_CREATE_SERVER"));
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4332 4333 4334 4335

    if (check_global_access(thd, SUPER_ACL))
      break;

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4336 4337
    if ((error= create_server(thd, &lex->server_options)))
    {
4338
      DBUG_PRINT("info", ("problem creating server <%s>",
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unknown committed
4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350
                          lex->server_options.server_name));
      my_error(error, MYF(0), lex->server_options.server_name);
      break;
    }
    send_ok(thd, 1);
    break;
  }
  case SQLCOM_ALTER_SERVER:
  {
    int error;
    LEX *lex= thd->lex;
    DBUG_PRINT("info", ("case SQLCOM_ALTER_SERVER"));
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unknown committed
4351 4352 4353 4354

    if (check_global_access(thd, SUPER_ACL))
      break;

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4355 4356
    if ((error= alter_server(thd, &lex->server_options)))
    {
4357
      DBUG_PRINT("info", ("problem altering server <%s>",
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unknown committed
4358 4359 4360 4361 4362 4363 4364 4365 4366 4367 4368 4369
                          lex->server_options.server_name));
      my_error(error, MYF(0), lex->server_options.server_name);
      break;
    }
    send_ok(thd, 1);
    break;
  }
  case SQLCOM_DROP_SERVER:
  {
    int err_code;
    LEX *lex= thd->lex;
    DBUG_PRINT("info", ("case SQLCOM_DROP_SERVER"));
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unknown committed
4370 4371 4372 4373

    if (check_global_access(thd, SUPER_ACL))
      break;

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4374 4375
    if ((err_code= drop_server(thd, &lex->server_options)))
    {
unknown's avatar
unknown committed
4376
      if (! lex->drop_if_exists && err_code == ER_FOREIGN_SERVER_DOESNT_EXIST)
unknown's avatar
unknown committed
4377 4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390
      {
        DBUG_PRINT("info", ("problem dropping server %s",
                            lex->server_options.server_name));
        my_error(err_code, MYF(0), lex->server_options.server_name);
      }
      else
      {
        send_ok(thd, 0);
      }
      break;
    }
    send_ok(thd, 1);
    break;
  }
4391
  default:
4392
#ifndef EMBEDDED_LIBRARY
4393
    DBUG_ASSERT(0);                             /* Impossible */
4394
#endif
4395
    send_ok(thd);
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4396 4397
    break;
  }
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4398

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4399
  thd->proc_info="query end";
4400 4401

  /*
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unknown committed
4402
    Binlog-related cleanup:
4403 4404 4405 4406 4407 4408 4409 4410 4411 4412 4413
    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);

4414
  /*
4415 4416
    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
4417 4418 4419 4420
    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))
4421
    thd->row_count_func= -1;
4422

4423
  goto finish;
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unknown committed
4424 4425

error:
4426 4427
  res= TRUE;

4428
finish:
4429 4430 4431 4432 4433 4434 4435 4436 4437
  if (need_start_waiting)
  {
    /*
      Release the protection against the global read lock and wake
      everyone, who might want to set a global read lock.
    */
    start_waiting_global_read_lock(thd);
  }
  DBUG_RETURN(res || thd->net.report_error);
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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
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()))
4464
        return 1;                               /* purecov: inspected */
4465 4466 4467 4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482
      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()))
4483
        return 1;                               /* purecov: inspected */
4484 4485 4486 4487 4488 4489 4490 4491 4492 4493
      query_cache_store_query(thd, all_tables);
      res= handle_select(thd, lex, result, 0);
      if (result != lex->result)
        delete result;
    }
  }
  return res;
}


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4494
/*
4495
  Check grants for commands which work only with one table.
unknown's avatar
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4496

4497
  SYNOPSIS
4498
    check_single_table_access()
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4499
    thd			Thread handler
4500
    privilege		requested privilege
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VIEW  
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4501
    all_tables		global table list of query
4502 4503
    no_errors           FALSE/TRUE - report/don't report error to
                            the client (using my_error() call).
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4504 4505 4506

  RETURN
    0 - OK
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4507
    1 - access denied, error is sent to client
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4508 4509
*/

4510
bool check_single_table_access(THD *thd, ulong privilege, 
4511
                               TABLE_LIST *all_tables, bool no_errors)
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4512
{
4513 4514 4515 4516 4517 4518
  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;

4519 4520 4521 4522 4523 4524 4525 4526
  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,
4527
		   &all_tables->grant.privilege, 0, no_errors,
4528
                   test(all_tables->schema_table)))
4529
    goto deny;
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4530

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4531
  /* Show only 1 table for check_grant */
4532
  if (!(all_tables->belong_to_view &&
4533
        (thd->lex->sql_command == SQLCOM_SHOW_FIELDS)) &&
4534
      check_grant(thd, privilege, all_tables, 0, 1, no_errors))
4535 4536 4537
    goto deny;

  thd->security_ctx= backup_ctx;
4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561
  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)
{
4562
  if (check_single_table_access (thd,privilege,all_tables, FALSE))
4563
    return 1;
unknown's avatar
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4564

4565
  /* Check rights on tables of subselects and implictly opened tables */
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4566
  TABLE_LIST *subselects_tables, *view= all_tables->view ? all_tables : 0;
unknown's avatar
VIEW  
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4567
  if ((subselects_tables= all_tables->next_global))
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4568
  {
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4569 4570 4571 4572 4573 4574
    /*
      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)
    {
4575
      if (check_single_table_access (thd, privilege, subselects_tables, FALSE))
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4576 4577 4578 4579 4580
        return 1;
      subselects_tables= subselects_tables->next_global;
    }
    if (subselects_tables &&
        (check_table_access(thd, SELECT_ACL, subselects_tables, 0)))
4581
      return 1;
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4582 4583
  }
  return 0;
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4584 4585 4586
}


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4587
/****************************************************************************
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4588
  Get the user (global) and database privileges for all used tables
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4589 4590 4591 4592 4593 4594 4595 4596 4597 4598 4599 4600 4601

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

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

    save_priv	In this we store global and db level grants for the table
		Note that we don't store db level grants if the global grants
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4602 4603
                is enough to satisfy the request and the global grants contains
                a SELECT grant.
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4604 4605 4606
****************************************************************************/

bool
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4607
check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
4608
	     bool dont_check_global_grants, bool no_errors, bool schema_db)
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4609
{
4610
  Security_context *sctx= thd->security_ctx;
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4611 4612
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  ulong db_access;
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4613
  bool  db_is_pattern= test(want_access & GRANT_ACL);
unknown's avatar
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4614 4615
#endif
  ulong dummy;
4616 4617
  DBUG_ENTER("check_access");
  DBUG_PRINT("enter",("db: %s  want_access: %lu  master_access: %lu",
4618
                      db ? db : "", want_access, sctx->master_access));
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4619 4620 4621 4622 4623
  if (save_priv)
    *save_priv=0;
  else
    save_priv= &dummy;

4624
  if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
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4625
  {
4626
    DBUG_PRINT("error",("No database"));
4627
    if (!no_errors)
unknown's avatar
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4628 4629
      my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR),
                 MYF(0));                       /* purecov: tested */
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4630
    DBUG_RETURN(TRUE);				/* purecov: tested */
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4631 4632
  }

4633 4634
  if (schema_db)
  {
4635 4636
    if (!(sctx->master_access & FILE_ACL) && (want_access & FILE_ACL) ||
        (want_access & ~(SELECT_ACL | EXTRA_ACL | FILE_ACL)))
4637 4638
    {
      if (!no_errors)
4639 4640
      {
        const char *db_name= db ? db : thd->db;
4641
        my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
4642 4643
                 sctx->priv_user, sctx->priv_host, db_name);
      }
4644 4645 4646 4647 4648 4649 4650 4651 4652
      DBUG_RETURN(TRUE);
    }
    else
    {
      *save_priv= SELECT_ACL;
      DBUG_RETURN(FALSE);
    }
  }

unknown's avatar
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4653 4654 4655
#ifdef NO_EMBEDDED_ACCESS_CHECKS
  DBUG_RETURN(0);
#else
4656
  if ((sctx->master_access & want_access) == want_access)
unknown's avatar
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4657
  {
4658 4659 4660 4661 4662
    /*
      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
    */
4663 4664
    db_access= sctx->db_access;
    if (!(sctx->master_access & SELECT_ACL) &&
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4665
	(db && (!thd->db || db_is_pattern || strcmp(db,thd->db))))
4666 4667 4668
      db_access=acl_get(sctx->host, sctx->ip, sctx->priv_user, db,
                        db_is_pattern);
    *save_priv=sctx->master_access | db_access;
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4669
    DBUG_RETURN(FALSE);
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4670
  }
4671
  if (((want_access & ~sctx->master_access) & ~(DB_ACLS | EXTRA_ACL)) ||
4672
      ! db && dont_check_global_grants)
unknown's avatar
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4673
  {						// We can never grant this
4674
    DBUG_PRINT("error",("No possible access"));
4675
    if (!no_errors)
4676
      my_error(ER_ACCESS_DENIED_ERROR, MYF(0),
4677 4678
               sctx->priv_user,
               sctx->priv_host,
4679 4680 4681
               (thd->password ?
                ER(ER_YES) :
                ER(ER_NO)));                    /* purecov: tested */
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4682
    DBUG_RETURN(TRUE);				/* purecov: tested */
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4683 4684 4685
  }

  if (db == any_db)
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4686
    DBUG_RETURN(FALSE);				// Allow select on anything
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4687

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4688
  if (db && (!thd->db || db_is_pattern || strcmp(db,thd->db)))
4689 4690
    db_access= acl_get(sctx->host, sctx->ip, sctx->priv_user, db,
                       db_is_pattern);
unknown's avatar
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4691
  else
4692
    db_access= sctx->db_access;
4693
  DBUG_PRINT("info",("db_access: %lu", db_access));
unknown's avatar
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4694
  /* Remove SHOW attribute and access rights we already have */
4695
  want_access &= ~(sctx->master_access | EXTRA_ACL);
4696 4697
  DBUG_PRINT("info",("db_access: %lu  want_access: %lu",
                     db_access, want_access));
4698
  db_access= ((*save_priv=(db_access | sctx->master_access)) & want_access);
4699

unknown's avatar
unknown committed
4700
  if (db_access == want_access ||
4701
      (!dont_check_global_grants &&
4702
       !(want_access & ~(db_access | TABLE_ACLS | PROC_ACLS))))
unknown's avatar
unknown committed
4703
    DBUG_RETURN(FALSE);				/* Ok */
4704 4705

  DBUG_PRINT("error",("Access denied"));
4706
  if (!no_errors)
4707
    my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
4708
             sctx->priv_user, sctx->priv_host,
4709 4710 4711
             (db ? db : (thd->db ?
                         thd->db :
                         "unknown")));          /* purecov: tested */
unknown's avatar
unknown committed
4712
  DBUG_RETURN(TRUE);				/* purecov: tested */
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4713
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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4714 4715 4716
}


4717 4718 4719 4720 4721 4722 4723 4724 4725
/*
  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
4726
    One gets access right if one has ANY of the rights in want_access
4727 4728 4729 4730 4731 4732 4733 4734
    This is useful as one in most cases only need one global right,
    but in some case we want to check if the user has SUPER or
    REPL_CLIENT_ACL rights.

  RETURN
    0	ok
    1	Access denied.  In this case an error is sent to the client
*/
unknown's avatar
unknown committed
4735 4736

bool check_global_access(THD *thd, ulong want_access)
unknown's avatar
unknown committed
4737
{
unknown's avatar
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4738 4739 4740
#ifdef NO_EMBEDDED_ACCESS_CHECKS
  return 0;
#else
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unknown committed
4741
  char command[128];
4742
  if ((thd->security_ctx->master_access & want_access))
unknown's avatar
unknown committed
4743 4744
    return 0;
  get_privilege_desc(command, sizeof(command), want_access);
4745
  my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), command);
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4746
  return 1;
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4747
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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4748 4749 4750
}


4751 4752
static bool check_show_access(THD *thd, TABLE_LIST *table)
{
unknown's avatar
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4753
  switch (get_schema_table_idx(table->schema_table)) {
4754 4755
  case SCH_SCHEMATA:
    return (specialflag & SPECIAL_SKIP_SHOW_DB) &&
unknown's avatar
unknown committed
4756
      check_global_access(thd, SHOW_DB_ACL);
4757 4758 4759 4760 4761

  case SCH_TABLE_NAMES:
  case SCH_TABLES:
  case SCH_VIEWS:
  case SCH_TRIGGERS:
unknown's avatar
unknown committed
4762 4763 4764
  case SCH_EVENTS:
  {
    const char *dst_db_name= table->schema_select_lex->db;
4765

unknown's avatar
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4766
    DBUG_ASSERT(dst_db_name);
4767

unknown's avatar
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4768 4769 4770 4771
    if (check_access(thd, SELECT_ACL, dst_db_name,
                     &thd->col_access, FALSE, FALSE,
                     is_schema_db(dst_db_name)))
      return TRUE;
4772

unknown's avatar
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4773 4774 4775 4776 4777 4778 4779
    if (!thd->col_access && check_grant_db(thd, dst_db_name))
    {
      my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
               thd->security_ctx->priv_user,
               thd->security_ctx->priv_host,
               dst_db_name);
      return TRUE;
4780 4781
    }

unknown's avatar
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4782 4783 4784
    return FALSE;
  }

4785 4786
  case SCH_COLUMNS:
  case SCH_STATISTICS:
unknown's avatar
unknown committed
4787 4788 4789
  {
    TABLE_LIST *dst_table;
    dst_table= (TABLE_LIST *) table->schema_select_lex->table_list.first;
4790

unknown's avatar
unknown committed
4791
    DBUG_ASSERT(dst_table);
4792

unknown's avatar
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4793 4794 4795 4796 4797 4798
    if (check_access(thd, SELECT_ACL | EXTRA_ACL,
                     dst_table->db,
                     &dst_table->grant.privilege,
                     FALSE, FALSE,
                     test(dst_table->schema_table)))
      return FALSE;
4799

4800
    return (check_grant(thd, SELECT_ACL, dst_table, 2, UINT_MAX, FALSE));
unknown's avatar
unknown committed
4801 4802
  }
  default:
4803 4804 4805 4806 4807 4808 4809
    break;
  }

  return FALSE;
}


unknown's avatar
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4810
/*
4811 4812 4813 4814 4815 4816 4817 4818 4819 4820 4821 4822 4823 4824 4825 4826 4827 4828 4829 4830
  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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4831 4832
*/

4833
bool
unknown's avatar
unknown committed
4834
check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables,
4835
		   bool no_errors)
unknown's avatar
unknown committed
4836
{
4837
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4838
  TABLE_LIST *org_tables= tables;
unknown's avatar
unknown committed
4839
#endif
4840
  TABLE_LIST *first_not_own_table= thd->lex->first_not_own_table();
4841
  Security_context *sctx= thd->security_ctx, *backup_ctx= thd->security_ctx;
4842
  /*
unknown's avatar
unknown committed
4843 4844 4845
    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.
4846
  */
unknown's avatar
unknown committed
4847
  for (; tables != first_not_own_table; tables= tables->next_global)
unknown's avatar
unknown committed
4848
  {
4849 4850 4851 4852 4853
    if (tables->security_ctx)
      sctx= tables->security_ctx;
    else
      sctx= backup_ctx;

4854
    if (tables->schema_table && 
4855
        (want_access & ~(SELECT_ACL | EXTRA_ACL | FILE_ACL)))
4856 4857 4858
    {
      if (!no_errors)
        my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
4859
                 sctx->priv_user, sctx->priv_host,
4860
                 INFORMATION_SCHEMA_NAME.str);
4861 4862
      return TRUE;
    }
4863 4864 4865 4866 4867
    /*
       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);
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4868 4869 4870 4871 4872 4873 4874 4875 4876 4877

    if (tables->schema_table_reformed)
    {
      if (check_show_access(thd, tables))
        goto deny;

      continue;
    }

    if (tables->derived ||
4878
        (tables->table && (int)tables->table->s->tmp_table))
unknown's avatar
unknown committed
4879
      continue;
4880 4881
    thd->security_ctx= sctx;
    if ((sctx->master_access & want_access) ==
4882
        (want_access & ~EXTRA_ACL) &&
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4883
	thd->db)
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4884
      tables->grant.privilege= want_access;
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4885
    else if (tables->db && thd->db && strcmp(tables->db, thd->db) == 0)
unknown's avatar
unknown committed
4886
    {
4887
      if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
4888
			 0, no_errors, test(tables->schema_table)))
4889
        goto deny;                            // Access denied
unknown's avatar
unknown committed
4890
    }
4891
    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
4892
			  0, no_errors, test(tables->schema_table)))
4893
      goto deny;
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4894
  }
4895
  thd->security_ctx= backup_ctx;
4896
  return check_grant(thd,want_access & ~EXTRA_ACL,org_tables,
unknown's avatar
unknown committed
4897
		       test(want_access & EXTRA_ACL), UINT_MAX, no_errors);
4898 4899 4900
deny:
  thd->security_ctx= backup_ctx;
  return TRUE;
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4901 4902
}

4903

4904
bool
4905 4906
check_routine_access(THD *thd, ulong want_access,char *db, char *name,
		     bool is_proc, bool no_errors)
4907 4908 4909 4910 4911
{
  TABLE_LIST tables[1];
  
  bzero((char *)tables, sizeof(TABLE_LIST));
  tables->db= db;
4912
  tables->table_name= tables->alias= name;
4913
  
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4914 4915 4916 4917 4918 4919 4920
  /*
    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)
4921 4922
    tables->grant.privilege= want_access;
  else if (check_access(thd,want_access,db,&tables->grant.privilege,
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4923
			0, no_errors, 0))
4924 4925
    return TRUE;
  
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4926
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4927
    return check_grant_routine(thd, want_access, tables, is_proc, no_errors);
4928
#else
4929
  return FALSE;
4930
#endif
4931 4932
}

4933 4934 4935 4936 4937 4938 4939 4940 4941 4942 4943 4944 4945 4946 4947

/*
  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
*/

4948 4949
bool check_some_routine_access(THD *thd, const char *db, const char *name,
                               bool is_proc)
4950 4951
{
  ulong save_priv;
4952
  if (thd->security_ctx->master_access & SHOW_PROC_ACLS)
4953
    return FALSE;
4954 4955 4956 4957 4958
  /*
    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) ||
4959 4960
      (save_priv & SHOW_PROC_ACLS))
    return FALSE;
4961
  return check_routine_level_acl(thd, db, name, is_proc);
4962 4963 4964
}


4965 4966 4967 4968 4969 4970 4971 4972 4973 4974 4975 4976 4977 4978 4979 4980 4981 4982 4983 4984 4985 4986 4987 4988 4989
/*
  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,
4990 4991
                        &table->grant.privilege, 0, 1,
                        test(table->schema_table)) &&
4992
          !check_grant(thd, access, table, 0, 1, 1))
4993 4994 4995 4996 4997 4998 4999 5000
        DBUG_RETURN(0);
    }
  }
  DBUG_PRINT("exit",("no matching access rights"));
  DBUG_RETURN(1);
}


5001 5002
bool check_merge_table_access(THD *thd, char *db,
			      TABLE_LIST *table_list)
5003 5004 5005 5006
{
  int error=0;
  if (table_list)
  {
5007
    /* Check that all tables use the current database */
5008
    TABLE_LIST *tmp;
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VIEW  
unknown committed
5009
    for (tmp= table_list; tmp; tmp= tmp->next_local)
5010 5011 5012 5013
    {
      if (!tmp->db || !tmp->db[0])
	tmp->db=db;
    }
5014
    error=check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
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5015
			     table_list,0);
5016 5017 5018 5019
  }
  return error;
}

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5020

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5021 5022 5023 5024 5025 5026 5027 5028 5029 5030
/****************************************************************************
	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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5031 5032 5033 5034
#ifndef DBUG_OFF
long max_stack_used;
#endif

5035
#ifndef EMBEDDED_LIBRARY
5036 5037 5038 5039 5040 5041 5042
/*
  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,
5043
			 uchar *buf __attribute__((unused)))
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5044 5045
{
  long stack_used;
5046
  DBUG_ASSERT(thd == current_thd);
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  if ((stack_used=used_stack(thd->thread_stack,(char*) &stack_used)) >=
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      (long) (thread_stack - margin))
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  {
5050 5051 5052
    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));
5053
    thd->fatal_error();
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    return 1;
  }
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#ifndef DBUG_OFF
  max_stack_used= max(max_stack_used, stack_used);
#endif
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  return 0;
}
5061
#endif /* EMBEDDED_LIBRARY */
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#define MY_YACC_INIT 1000			// Start with big alloc
#define MY_YACC_MAX  32000			// Because of 'short'

5066
bool my_yyoverflow(short **yyss, YYSTYPE **yyvs, ulong *yystacksize)
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{
5068
  LEX	*lex= current_thd->lex;
5069
  ulong old_info=0;
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  if ((uint) *yystacksize >= MY_YACC_MAX)
    return 1;
  if (!lex->yacc_yyvs)
    old_info= *yystacksize;
  *yystacksize= set_zone((*yystacksize)*2,MY_YACC_INIT,MY_YACC_MAX);
5075 5076
  if (!(lex->yacc_yyvs= (uchar*)
	my_realloc(lex->yacc_yyvs,
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		   *yystacksize*sizeof(**yyvs),
		   MYF(MY_ALLOW_ZERO_PTR | MY_FREE_ON_ERROR))) ||
5079 5080
      !(lex->yacc_yyss= (uchar*)
	my_realloc(lex->yacc_yyss,
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		   *yystacksize*sizeof(**yyss),
		   MYF(MY_ALLOW_ZERO_PTR | MY_FREE_ON_ERROR))))
    return 1;
  if (old_info)
  {						// Copy old info from stack
5086 5087
    memcpy(lex->yacc_yyss, (uchar*) *yyss, old_info*sizeof(**yyss));
    memcpy(lex->yacc_yyvs, (uchar*) *yyvs, old_info*sizeof(**yyvs));
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  }
  *yyss=(short*) lex->yacc_yyss;
  *yyvs=(YYSTYPE*) lex->yacc_yyvs;
  return 0;
}


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/*
 Reset THD part responsible for command processing state.

 DESCRIPTION
   This needs to be called before execution of every statement
   (prepared or conventional).
5101
   It is not called by substatements of routines.
5102 5103 5104 5105 5106 5107 5108 5109 5110 5111

 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");
5112
  DBUG_ASSERT(!thd->spcont); /* not for substatements of routines */
5113
  thd->free_list= 0;
5114
  thd->select_number= 1;
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  /*
    Those two lines below are theoretically unneeded as
    THD::cleanup_after_query() should take care of this already.
  */
5119
  thd->auto_inc_intervals_in_cur_stmt_for_binlog.empty();
5120 5121 5122
  thd->stmt_depends_on_first_successful_insert_id_in_prev_stmt= 0;

  thd->query_start_used= 0;
5123
  thd->is_fatal_error= thd->time_zone_used= 0;
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  thd->server_status&= ~ (SERVER_MORE_RESULTS_EXISTS | 
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                          SERVER_QUERY_NO_INDEX_USED |
                          SERVER_QUERY_NO_GOOD_INDEX_USED);
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  /*
    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)))
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  {
    thd->options&= ~OPTION_KEEP_LOG;
    thd->no_trans_update.all= FALSE;
  }
5137
  DBUG_ASSERT(thd->security_ctx== &thd->main_security_ctx);
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  thd->tmp_table_used= 0;
5139 5140
  if (!thd->in_sub_stmt)
  {
5141
    if (opt_bin_log)
5142
    {
5143
      reset_dynamic(&thd->user_var_events);
5144 5145
      thd->user_var_events_alloc= thd->mem_root;
    }
5146
    thd->clear_error();
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    thd->total_warn_count=0;			// Warnings for this query
    thd->rand_used= 0;
    thd->sent_row_count= thd->examined_row_count= 0;
  }
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  /*
    Because we come here only for start of top-statements, binlog format is
    constant inside a complex statement (using stored functions) etc.
  */
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  thd->reset_current_stmt_binlog_row_based();

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  DBUG_VOID_RETURN;
}

5160

5161 5162 5163
void
mysql_init_select(LEX *lex)
{
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  SELECT_LEX *select_lex= lex->current_select;
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  select_lex->init_select();
5166
  lex->wild= 0;
5167 5168
  if (select_lex == &lex->select_lex)
  {
5169
    DBUG_ASSERT(lex->result == 0);
5170 5171
    lex->exchange= 0;
  }
5172 5173
}

5174

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bool
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mysql_new_select(LEX *lex, bool move_down)
5177
{
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  SELECT_LEX *select_lex;
5179
  THD *thd= lex->thd;
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  DBUG_ENTER("mysql_new_select");

5182
  if (!(select_lex= new (thd->mem_root) SELECT_LEX()))
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    DBUG_RETURN(1);
5184
  select_lex->select_number= ++thd->select_number;
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  select_lex->parent_lex= lex; /* Used in init_query. */
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  select_lex->init_query();
  select_lex->init_select();
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  lex->nest_level++;
  select_lex->nest_level= lex->nest_level;
5190 5191 5192 5193 5194
  /*
    Don't evaluate this subquery during statement prepare even if
    it's a constant one. The flag is switched off in the end of
    mysql_stmt_prepare.
  */
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  if (thd->stmt_arena->is_stmt_prepare())
5196
    select_lex->uncacheable|= UNCACHEABLE_PREPARE;
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  if (move_down)
  {
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    SELECT_LEX_UNIT *unit;
5200
    lex->subqueries= TRUE;
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    /* first select_lex of subselect or derived table */
5202
    if (!(unit= new (thd->mem_root) SELECT_LEX_UNIT()))
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      DBUG_RETURN(1);
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5204

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    unit->init_query();
    unit->init_select();
5207
    unit->thd= thd;
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    unit->include_down(lex->current_select);
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    unit->link_next= 0;
    unit->link_prev= 0;
5211
    unit->return_to= lex->current_select;
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    select_lex->include_down(unit);
5213 5214 5215 5216 5217
    /*
      By default we assume that it is usual subselect and we have outer name
      resolution context, if no we will assign it to 0 later
    */
    select_lex->context.outer_context= &select_lex->outer_select()->context;
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  }
  else
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  {
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VIEW  
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    if (lex->current_select->order_list.first && !lex->current_select->braces)
    {
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      my_error(ER_WRONG_USAGE, MYF(0), "UNION", "ORDER BY");
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      DBUG_RETURN(1);
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VIEW  
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5225
    }
5226
    select_lex->include_neighbour(lex->current_select);
5227 5228 5229 5230 5231
    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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5232
  }
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5233

5234
  select_lex->master_unit()->global_parameters= select_lex;
5235
  select_lex->include_global((st_select_lex_node**)&lex->all_selects_list);
5236
  lex->current_select= select_lex;
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  /*
    in subquery is SELECT query and we allow resolution of names in SELECT
    list
  */
  select_lex->context.resolve_in_select_list= TRUE;
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5242
  DBUG_RETURN(0);
5243
}
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5244

5245 5246 5247 5248 5249 5250 5251 5252 5253 5254 5255 5256 5257 5258 5259
/*
  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)
{
5260
  THD *thd;
5261
  LEX *lex;
5262
  LEX_STRING tmp, null_lex_string;
5263 5264
  Item *var;
  char buff[MAX_SYS_VAR_LENGTH*2+4+8], *end;
5265
  DBUG_ENTER("create_select_for_variable");
5266 5267

  thd= current_thd;
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  lex= thd->lex;
5269 5270 5271 5272
  mysql_init_select(lex);
  lex->sql_command= SQLCOM_SELECT;
  tmp.str= (char*) var_name;
  tmp.length=strlen(var_name);
5273
  bzero((char*) &null_lex_string.str, sizeof(null_lex_string));
5274 5275 5276 5277
  /*
    We set the name of Item to @@session.var_name because that then is used
    as the column name in the output.
  */
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  if ((var= get_system_var(thd, OPT_SESSION, tmp, null_lex_string)))
  {
    end= strxmov(buff, "@@session.", var_name, NullS);
    var->set_name(buff, end-buff, system_charset_info);
    add_item_to_list(thd, var);
  }
5284 5285 5286
  DBUG_VOID_RETURN;
}

5287

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5288 5289
void mysql_init_multi_delete(LEX *lex)
{
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5290
  lex->sql_command=  SQLCOM_DELETE_MULTI;
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5291
  mysql_init_select(lex);
5292 5293
  lex->select_lex.select_limit= 0;
  lex->unit.select_limit_cnt= HA_POS_ERROR;
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5294
  lex->select_lex.table_list.save_and_clear(&lex->auxiliary_table_list);
5295
  lex->lock_option= using_update_log ? TL_READ_NO_INSERT : TL_READ;
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VIEW  
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5296 5297
  lex->query_tables= 0;
  lex->query_tables_last= &lex->query_tables;
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5298
}
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5299

5300

5301 5302 5303 5304
/*
  When you modify mysql_parse(), you may need to mofify
  mysql_test_parse_for_slave() in this same file.
*/
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5305

5306 5307 5308 5309 5310 5311 5312 5313 5314 5315 5316
/**
  Parse a query.
  @param thd Current thread
  @param inBuf Begining of the query text
  @param length Length of the query text
  @param [out] semicolon For multi queries, position of the character of
  the next query in the query text.
*/

void mysql_parse(THD *thd, const char *inBuf, uint length,
                 const char ** found_semicolon)
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5317 5318
{
  DBUG_ENTER("mysql_parse");
5319 5320 5321

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

5322 5323 5324 5325 5326 5327 5328 5329 5330 5331 5332 5333 5334 5335 5336 5337 5338 5339
  /*
    Warning.
    The purpose of query_cache_send_result_to_client() is to lookup the
    query in the query cache first, to avoid parsing and executing it.
    So, the natural implementation would be to:
    - first, call query_cache_send_result_to_client,
    - second, if caching failed, initialise the lexical and syntactic parser.
    The problem is that the query cache depends on a clean initialization
    of (among others) lex->safe_to_cache_query and thd->server_status,
    which are reset respectively in
    - lex_start()
    - mysql_reset_thd_for_next_command()
    So, initializing the lexical analyser *before* using the query cache
    is required for the cache to work properly.
    FIXME: cleanup the dependencies in the code to simplify this.
  */
  lex_start(thd);
  mysql_reset_thd_for_next_command(thd);
5340

5341
  if (query_cache_send_result_to_client(thd, (char*) inBuf, length) <= 0)
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5342
  {
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5343
    LEX *lex= thd->lex;
5344

5345 5346
    sp_cache_flush_obsolete(&thd->sp_proc_cache);
    sp_cache_flush_obsolete(&thd->sp_func_cache);
5347 5348 5349 5350 5351 5352 5353 5354

    Lex_input_stream lip(thd, inBuf, length);
    thd->m_lip= &lip;

    int err= MYSQLparse(thd);
    *found_semicolon= lip.found_semicolon;

    if (!err && ! thd->is_fatal_error)
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5355
    {
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5356
#ifndef NO_EMBEDDED_ACCESS_CHECKS
5357
      if (mqh_used && thd->user_connect &&
5358
	  check_mqh(thd, lex->sql_command))
5359 5360 5361 5362
      {
	thd->net.error = 0;
      }
      else
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5363
#endif
5364
      {
5365
	if (! thd->net.report_error)
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5366
	{
5367 5368 5369 5370 5371 5372 5373 5374 5375 5376
          /*
            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.
          */
5377 5378
          if (lip.found_semicolon &&
              (thd->query_length= (ulong)(lip.found_semicolon - thd->query)))
5379 5380
            thd->query_length--;
          /* Actually execute the query */
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5381
	  mysql_execute_command(thd);
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SCRUM  
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5382
	  query_cache_end_of_result(thd);
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5383
	}
5384
      }
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5385 5386
    }
    else
5387
    {
5388
      DBUG_ASSERT(thd->net.report_error);
5389
      DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
5390
			 thd->is_fatal_error));
5391 5392

      query_cache_abort(&thd->net);
5393
    }
5394 5395 5396 5397 5398 5399
    if (thd->lex->sphead)
    {
      delete thd->lex->sphead;
      thd->lex->sphead= 0;
    }
    lex->unit.cleanup();
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5400
    thd->proc_info="freeing items";
5401
    thd->end_statement();
5402
    thd->cleanup_after_query();
5403
    DBUG_ASSERT(thd->change_list.is_empty());
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5404
  }
5405 5406 5407 5408 5409 5410
  else
  {
    /* There are no multi queries in the cache. */
    *found_semicolon= NULL;
  }

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5411 5412 5413 5414
  DBUG_VOID_RETURN;
}


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5415
#ifdef HAVE_REPLICATION
5416 5417 5418 5419 5420 5421 5422 5423 5424 5425 5426
/*
  Usable by the replication SQL thread only: just parse a query to know if it
  can be ignored because of replicate-*-table rules.

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

bool mysql_test_parse_for_slave(THD *thd, char *inBuf, uint length)
{
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5427
  LEX *lex= thd->lex;
5428
  bool error= 0;
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5429
  DBUG_ENTER("mysql_test_parse_for_slave");
5430

5431 5432 5433 5434 5435 5436 5437
  Lex_input_stream lip(thd, inBuf, length);
  thd->m_lip= &lip;
  lex_start(thd);
  mysql_reset_thd_for_next_command(thd);
  int err= MYSQLparse((void*) thd);

  if (!err && ! thd->is_fatal_error &&
5438
      all_tables_not_ok(thd,(TABLE_LIST*) lex->select_lex.table_list.first))
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5439
    error= 1;                  /* Ignore question */
5440
  thd->end_statement();
5441
  thd->cleanup_after_query();
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5442
  DBUG_RETURN(error);
5443
}
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5444
#endif
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5445

5446

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5447

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5448 5449 5450 5451 5452
/*****************************************************************************
** Store field definition for create
** Return 0 if ok
******************************************************************************/

5453
bool add_field_to_list(THD *thd, LEX_STRING *field_name, enum_field_types type,
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5454
		       char *length, char *decimals,
5455
		       uint type_modifier,
5456 5457
		       Item *default_value, Item *on_update_value,
                       LEX_STRING *comment,
5458 5459
		       char *change,
                       List<String> *interval_list, CHARSET_INFO *cs,
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5460
		       uint uint_geom_type)
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5461 5462
{
  register create_field *new_field;
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5463
  LEX  *lex= thd->lex;
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5464 5465
  DBUG_ENTER("add_field_to_list");

5466 5467
  if (check_string_char_length(field_name, "", NAME_CHAR_LEN,
                               system_charset_info, 1))
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5468
  {
5469
    my_error(ER_TOO_LONG_IDENT, MYF(0), field_name->str); /* purecov: inspected */
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5470 5471 5472 5473
    DBUG_RETURN(1);				/* purecov: inspected */
  }
  if (type_modifier & PRI_KEY_FLAG)
  {
5474
    Key *key;
5475
    lex->col_list.push_back(new key_part_spec(field_name->str, 0));
5476 5477 5478 5479
    key= new Key(Key::PRIMARY, NullS,
                      &default_key_create_info,
                      0, lex->col_list);
    lex->alter_info.key_list.push_back(key);
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    lex->col_list.empty();
  }
  if (type_modifier & (UNIQUE_FLAG | UNIQUE_KEY_FLAG))
  {
5484
    Key *key;
5485
    lex->col_list.push_back(new key_part_spec(field_name->str, 0));
5486 5487 5488 5489
    key= new Key(Key::UNIQUE, NullS,
                 &default_key_create_info, 0,
                 lex->col_list);
    lex->alter_info.key_list.push_back(key);
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    lex->col_list.empty();
  }

5493
  if (default_value)
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5494
  {
5495
    /* 
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5496 5497
      Default value should be literal => basic constants =>
      no need fix_fields()
5498 5499 5500
      
      We allow only one function as part of default value - 
      NOW() as default for TIMESTAMP type.
5501
    */
5502 5503
    if (default_value->type() == Item::FUNC_ITEM && 
        !(((Item_func*)default_value)->functype() == Item_func::NOW_FUNC &&
5504
         type == MYSQL_TYPE_TIMESTAMP))
5505
    {
5506
      my_error(ER_INVALID_DEFAULT, MYF(0), field_name->str);
5507 5508 5509
      DBUG_RETURN(1);
    }
    else if (default_value->type() == Item::NULL_ITEM)
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5510
    {
5511
      default_value= 0;
5512 5513 5514
      if ((type_modifier & (NOT_NULL_FLAG | AUTO_INCREMENT_FLAG)) ==
	  NOT_NULL_FLAG)
      {
5515
	my_error(ER_INVALID_DEFAULT, MYF(0), field_name->str);
5516 5517 5518 5519 5520
	DBUG_RETURN(1);
      }
    }
    else if (type_modifier & AUTO_INCREMENT_FLAG)
    {
5521
      my_error(ER_INVALID_DEFAULT, MYF(0), field_name->str);
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5522 5523 5524
      DBUG_RETURN(1);
    }
  }
5525

5526
  if (on_update_value && type != MYSQL_TYPE_TIMESTAMP)
5527
  {
5528
    my_error(ER_INVALID_ON_UPDATE, MYF(0), field_name->str);
5529 5530
    DBUG_RETURN(1);
  }
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5531

5532
  if (type == MYSQL_TYPE_TIMESTAMP && length)
5533 5534 5535 5536 5537
  {
    /* Display widths are no longer supported for TIMSTAMP as of MySQL 4.1.
       In other words, for declarations such as TIMESTAMP(2), TIMESTAMP(4),
       and so on, the display width is ignored.
    */
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5538
    char buf[32];
5539
    my_snprintf(buf, sizeof(buf), "TIMESTAMP(%s)", length);
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5540
    WARN_DEPRECATED(thd, "5.2", buf, "'TIMESTAMP'");
5541 5542
  }

5543
  if (!(new_field= new create_field()) ||
5544
      new_field->init(thd, field_name->str, type, length, decimals, type_modifier,
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                      default_value, on_update_value, comment, change,
                      interval_list, cs, uint_geom_type))
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    DBUG_RETURN(1);
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  lex->alter_info.create_list.push_back(new_field);
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  lex->last_field=new_field;
  DBUG_RETURN(0);
}

5554

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

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

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

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


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


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


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/*
  Add a table to list of used tables

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

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

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TABLE_LIST *st_select_lex::add_table_to_list(THD *thd,
					     Table_ident *table,
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					     LEX_STRING *alias,
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					     ulong table_options,
					     thr_lock_type lock_type,
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					     List<index_hint> *index_hints_arg,
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                                             LEX_STRING *option)
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{
  register TABLE_LIST *ptr;
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  TABLE_LIST *previous_table_ref; /* The table preceding the current one. */
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  char *alias_str;
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  LEX *lex= thd->lex;
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  DBUG_ENTER("add_table_to_list");
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  LINT_INIT(previous_table_ref);
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  if (!table)
    DBUG_RETURN(0);				// End of memory
  alias_str= alias ? alias->str : table->table.str;
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  if (!test(table_options & TL_OPTION_ALIAS) && 
      check_table_name(table->table.str, table->table.length))
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  {
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    my_error(ER_WRONG_TABLE_NAME, MYF(0), table->table.str);
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    DBUG_RETURN(0);
  }
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  if (table->is_derived_table() == FALSE && table->db.str &&
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      check_db_name(&table->db))
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  {
    my_error(ER_WRONG_DB_NAME, MYF(0), table->db.str);
    DBUG_RETURN(0);
  }
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  if (!alias)					/* Alias is case sensitive */
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  {
    if (table->sel)
    {
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      my_message(ER_DERIVED_MUST_HAVE_ALIAS,
                 ER(ER_DERIVED_MUST_HAVE_ALIAS), MYF(0));
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      DBUG_RETURN(0);
    }
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    if (!(alias_str= (char*) thd->memdup(alias_str,table->table.length+1)))
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      DBUG_RETURN(0);
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  }
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  if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
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    DBUG_RETURN(0);				/* purecov: inspected */
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  if (table->db.str)
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  {
    ptr->db= table->db.str;
    ptr->db_length= table->db.length;
  }
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  else if (thd->copy_db_to(&ptr->db, &ptr->db_length))
    DBUG_RETURN(0);
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  ptr->alias= alias_str;
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  if (lower_case_table_names && table->table.length)
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    table->table.length= my_casedn_str(files_charset_info, table->table.str);
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  ptr->table_name=table->table.str;
  ptr->table_name_length=table->table.length;
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  ptr->lock_type=   lock_type;
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  ptr->updating=    test(table_options & TL_OPTION_UPDATING);
  ptr->force_index= test(table_options & TL_OPTION_FORCE_INDEX);
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  ptr->ignore_leaves= test(table_options & TL_OPTION_IGNORE_LEAVES);
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  ptr->derived=	    table->sel;
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  if (!ptr->derived && !my_strcasecmp(system_charset_info, ptr->db,
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                                      INFORMATION_SCHEMA_NAME.str))
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  {
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    ST_SCHEMA_TABLE *schema_table= find_schema_table(thd, ptr->table_name);
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    if (!schema_table ||
        (schema_table->hidden && 
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         (sql_command_flags[lex->sql_command] & CF_STATUS_COMMAND) == 0))
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    {
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      my_error(ER_UNKNOWN_TABLE, MYF(0),
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               ptr->table_name, INFORMATION_SCHEMA_NAME.str);
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      DBUG_RETURN(0);
    }
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    ptr->schema_table_name= ptr->table_name;
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    ptr->schema_table= schema_table;
  }
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  ptr->select_lex=  lex->current_select;
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  ptr->cacheable_table= 1;
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  ptr->index_hints= index_hints_arg;
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  ptr->option= option ? option->str : 0;
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  /* check that used name is unique */
5704
  if (lock_type != TL_IGNORE)
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  {
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    TABLE_LIST *first_table= (TABLE_LIST*) table_list.first;
    if (lex->sql_command == SQLCOM_CREATE_VIEW)
      first_table= first_table ? first_table->next_local : NULL;
    for (TABLE_LIST *tables= first_table ;
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	 tables ;
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	 tables=tables->next_local)
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    {
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      if (!my_strcasecmp(table_alias_charset, alias_str, tables->alias) &&
	  !strcmp(ptr->db, tables->db))
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      {
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	my_error(ER_NONUNIQ_TABLE, MYF(0), alias_str); /* purecov: tested */
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	DBUG_RETURN(0);				/* purecov: tested */
      }
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    }
  }
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  /* Store the table reference preceding the current one. */
  if (table_list.elements > 0)
  {
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    /*
      table_list.next points to the last inserted TABLE_LIST->next_local'
      element
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      We don't use the offsetof() macro here to avoid warnings from gcc
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    */
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    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;
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  }
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  /*
    Link the current table reference in a local list (list for current select).
    Notice that as a side effect here we set the next_local field of the
    previous table reference to 'ptr'. Here we also add one element to the
    list 'table_list'.
  */
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  table_list.link_in_list((uchar*) ptr, (uchar**) &ptr->next_local);
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  ptr->next_name_resolution_table= NULL;
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  /* Link table in global list (all used tables) */
5751
  lex->add_to_query_tables(ptr);
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  DBUG_RETURN(ptr);
}

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/*
  Initialize a new table list for a nested join

  SYNOPSIS
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    init_nested_join()
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    thd         current thread
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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");
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  if (!(ptr= (TABLE_LIST*) thd->calloc(ALIGN_SIZE(sizeof(TABLE_LIST))+
                                       sizeof(NESTED_JOIN))))
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    DBUG_RETURN(1);
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  nested_join= ptr->nested_join=
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    ((NESTED_JOIN*) ((uchar*) ptr + ALIGN_SIZE(sizeof(TABLE_LIST))));
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  join_list->push_front(ptr);
  ptr->embedding= embedding;
  ptr->join_list= join_list;
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  ptr->alias= (char*) "(nested_join)";
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  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
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    moves it one level up, eliminating the nest.
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  RETURN VALUE
    Pointer to TABLE_LIST element added to the total table list, if success
    0, otherwise
*/

TABLE_LIST *st_select_lex::end_nested_join(THD *thd)
{
  TABLE_LIST *ptr;
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  NESTED_JOIN *nested_join;
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  DBUG_ENTER("end_nested_join");
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  DBUG_ASSERT(embedding);
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  ptr= embedding;
  join_list= ptr->join_list;
  embedding= ptr->embedding;
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  nested_join= ptr->nested_join;
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  if (nested_join->join_list.elements == 1)
  {
    TABLE_LIST *embedded= nested_join->join_list.head();
    join_list->pop();
    embedded->join_list= join_list;
    embedded->embedding= embedding;
    join_list->push_front(embedded);
    ptr= embedded;
  }
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  else if (nested_join->join_list.elements == 0)
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  {
    join_list->pop();
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    ptr= 0;                                     // return value
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  }
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  DBUG_RETURN(ptr);
}


/*
  Nest last join operation

  SYNOPSIS
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    nest_last_join()
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    thd         current thread

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

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

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*/

TABLE_LIST *st_select_lex::nest_last_join(THD *thd)
{
  TABLE_LIST *ptr;
  NESTED_JOIN *nested_join;
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  List<TABLE_LIST> *embedded_list;
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  DBUG_ENTER("nest_last_join");
5868

5869 5870
  if (!(ptr= (TABLE_LIST*) thd->calloc(ALIGN_SIZE(sizeof(TABLE_LIST))+
                                       sizeof(NESTED_JOIN))))
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    DBUG_RETURN(0);
5872
  nested_join= ptr->nested_join=
5873
    ((NESTED_JOIN*) ((uchar*) ptr + ALIGN_SIZE(sizeof(TABLE_LIST))));
5874

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  ptr->embedding= embedding;
  ptr->join_list= join_list;
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  ptr->alias= (char*) "(nest_last_join)";
5878
  embedded_list= &nested_join->join_list;
5879
  embedded_list->empty();
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  for (uint i=0; i < 2; i++)
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  {
    TABLE_LIST *table= join_list->pop();
    table->join_list= embedded_list;
    table->embedding= ptr;
    embedded_list->push_back(table);
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    if (table->natural_join)
    {
      ptr->is_natural_join= TRUE;
      /*
        If this is a JOIN ... USING, move the list of joined fields to the
        table reference that describes the join.
      */
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      if (prev_join_using)
        ptr->join_using_fields= prev_join_using;
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    }
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  }
  join_list->push_front(ptr);
  nested_join->used_tables= nested_join->not_null_tables= (table_map) 0;
  DBUG_RETURN(ptr);
}


/*
  Add a table to the current join list

  SYNOPSIS
    add_joined_table()
    table       the table to add

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

  RETURN VALUE
    None
*/

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


/*
  Convert a right join into equivalent left join

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

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

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

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

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

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

5963
TABLE_LIST *st_select_lex::convert_right_join()
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{
  TABLE_LIST *tab2= join_list->pop();
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  TABLE_LIST *tab1= join_list->pop();
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  DBUG_ENTER("convert_right_join");

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

  DBUG_RETURN(tab1);
}

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/*
  Set lock for all tables in current select level

  SYNOPSIS:
    set_lock_for_tables()
    lock_type			Lock to set for tables

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

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

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

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/*
  Create a fake SELECT_LEX for a unit

  SYNOPSIS:
    add_fake_select_lex()
    thd			   thread handle

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

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

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

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  fake_select_lex->context.outer_context=first_sl->context.outer_context;
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  /* allow item list resolving in fake select for ORDER BY */
  fake_select_lex->context.resolve_in_select_list= TRUE;
  fake_select_lex->context.select_lex= fake_select_lex;
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6052
  if (!is_union())
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  {
    /* 
      This works only for 
      (SELECT ... ORDER BY list [LIMIT n]) ORDER BY order_list [LIMIT m],
      (SELECT ... LIMIT n) ORDER BY order_list [LIMIT m]
      just before the parser starts processing order_list
    */ 
    global_parameters= fake_select_lex;
    fake_select_lex->no_table_names_allowed= 1;
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    thd_arg->lex->current_select= fake_select_lex;
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  }
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  thd_arg->lex->pop_context();
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  DBUG_RETURN(0);
}

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/*
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  Push a new name resolution context for a JOIN ... ON clause to the
  context stack of a query block.
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  SYNOPSIS
6074
    push_new_name_resolution_context()
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    thd       pointer to current thread
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    left_op   left  operand of the JOIN
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    right_op  rigth operand of the JOIN

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

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bool
push_new_name_resolution_context(THD *thd,
                                 TABLE_LIST *left_op, TABLE_LIST *right_op)
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{
  Name_resolution_context *on_context;
6095
  if (!(on_context= new (thd->mem_root) Name_resolution_context))
6096
    return TRUE;
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  on_context->init();
  on_context->first_name_resolution_table=
    left_op->first_leaf_for_name_resolution();
  on_context->last_name_resolution_table=
    right_op->last_leaf_for_name_resolution();
6102
  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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{
6124
  if (expr)
6125
  {
6126
    if (!b->on_expr)
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      b->on_expr= expr;
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    else
    {
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      /*
        If called from the parser, this happens if you have both a
        right and left join. If called later, it happens if we add more
        than one condition to the ON clause.
      */
      b->on_expr= new Item_cond_and(b->on_expr,expr);
6136 6137
    }
    b->on_expr->top_level_item();
6138
  }
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}


6142
/*
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  Mark that there is a NATURAL JOIN or JOIN ... USING between two
  tables.
6145 6146 6147

  SYNOPSIS
    add_join_natural()
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    a			Left join argument
    b			Right join argument
    using_fields        Field names from USING clause
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    lex                 The current st_select_lex
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6153
  IMPLEMENTATION
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    This function marks that table b should be joined with a either via
    a NATURAL JOIN or via JOIN ... USING. Both join types are special
    cases of each other, so we treat them together. The function
    setup_conds() creates a list of equal condition between all fields
    of the same name for NATURAL JOIN or the fields in 'using_fields'
    for JOIN ... USING. The list of equality conditions is stored
    either in b->on_expr, or in JOIN::conds, depending on whether there
    was an outer join.

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

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

  RETURN
    None
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*/

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

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6188
/*
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  Reload/resets privileges and the different caches.

  SYNOPSIS
    reload_acl_and_cache()
6193
    thd			Thread handler (can be NULL!)
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    options             What should be reset/reloaded (tables, privileges,
    slave...)
    tables              Tables to flush (if any)
    write_to_binlog     Depending on 'options', it may be very bad to write the
                        query to the binlog (e.g. FLUSH SLAVE); this is a
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                        pointer where reload_acl_and_cache() will put 0 if
                        it thinks we really should not write to the binlog.
                        Otherwise it will put 1.
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  RETURN
    0	 ok
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    !=0  error.  thd->killed or thd->net.report_error is set
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*/

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bool reload_acl_and_cache(THD *thd, ulong options, TABLE_LIST *tables,
                          bool *write_to_binlog)
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{
  bool result=0;
  select_errors=0;				/* Write if more errors */
6213
  bool tmp_write_to_binlog= 1;
6214

6215
  DBUG_ASSERT(!thd || !thd->in_sub_stmt);
6216

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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  if (options & REFRESH_GRANT)
  {
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    THD *tmp_thd= 0;
    /*
      If reload_acl_and_cache() is called from SIGHUP handler we have to
      allocate temporary THD for execution of acl_reload()/grant_reload().
    */
    if (!thd && (thd= (tmp_thd= new THD)))
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    {
      thd->thread_stack= (char*) &tmp_thd;
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      thd->store_globals();
6229
    }
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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;
    }
6242
    reset_mqh((LEX_USER *)NULL, TRUE);
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  }
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#endif
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  if (options & REFRESH_LOG)
  {
6247
    /*
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      Flush the normal query log, the update log, the binary log,
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      the slow query log, the relay log (if it exists) and the log
      tables.
6251
    */
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6253
    /*
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      Writing this command to the binlog may result in infinite loops
      when doing mysqlbinlog|mysql, and anyway it does not really make
      sense to log it automatically (would cause more trouble to users
      than it would help them)
6258 6259
    */
    tmp_write_to_binlog= 0;
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    if( mysql_bin_log.is_open() )
    {
      mysql_bin_log.rotate_and_purge(RP_FORCE_ROTATE);
    }
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#ifdef HAVE_REPLICATION
6265
    pthread_mutex_lock(&LOCK_active_mi);
6266
    rotate_relay_log(active_mi);
6267
    pthread_mutex_unlock(&LOCK_active_mi);
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#endif
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    /* flush slow and general logs */
    logger.flush_logs(thd);

    if (ha_flush_logs(NULL))
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      result=1;
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    if (flush_error_log())
      result=1;
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  }
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#ifdef HAVE_QUERY_CACHE
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  if (options & REFRESH_QUERY_CACHE_FREE)
  {
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    query_cache.pack();				// FLUSH QUERY CACHE
6282
    options &= ~REFRESH_QUERY_CACHE;    // Don't flush cache, just free memory
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  }
  if (options & (REFRESH_TABLES | REFRESH_QUERY_CACHE))
  {
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    query_cache.flush();			// RESET QUERY CACHE
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  }
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#endif /*HAVE_QUERY_CACHE*/
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  /*
    Note that if REFRESH_READ_LOCK bit is set then REFRESH_TABLES is set too
    (see sql_yacc.yy)
  */
  if (options & (REFRESH_TABLES | REFRESH_READ_LOCK)) 
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  {
6295
    if ((options & REFRESH_READ_LOCK) && thd)
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    {
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      /*
        We must not try to aspire a global read lock if we have a write
        locked table. This would lead to a deadlock when trying to
        reopen (and re-lock) the table after the flush.
      */
      if (thd->locked_tables)
      {
        THR_LOCK_DATA **lock_p= thd->locked_tables->locks;
        THR_LOCK_DATA **end_p= lock_p + thd->locked_tables->lock_count;

        for (; lock_p < end_p; lock_p++)
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        {
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          if ((*lock_p)->type == TL_WRITE)
          {
            my_error(ER_LOCK_OR_ACTIVE_TRANSACTION, MYF(0));
            return 1;
          }
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        }
6315
      }
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      /*
	Writing to the binlog could cause deadlocks, as we don't log
	UNLOCK TABLES
      */
6320
      tmp_write_to_binlog= 0;
6321
      if (lock_global_read_lock(thd))
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	return 1;                               // Killed
6323 6324
      result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1,
                                 tables);
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      if (make_global_read_lock_block_commit(thd)) // Killed
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      {
        /* Don't leave things in a half-locked state */
        unlock_global_read_lock(thd);
        return 1;
      }
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    }
6332 6333
    else
      result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1, tables);
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    my_dbopt_cleanup();
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  }
  if (options & REFRESH_HOSTS)
    hostname_cache_refresh();
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  if (thd && (options & REFRESH_STATUS))
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    refresh_status(thd);
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  if (options & REFRESH_THREADS)
    flush_thread_cache();
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#ifdef HAVE_REPLICATION
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  if (options & REFRESH_MASTER)
6344
  {
6345
    DBUG_ASSERT(thd);
6346
    tmp_write_to_binlog= 0;
6347
    if (reset_master(thd))
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    {
6349
      result=1;
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      thd->fatal_error();                       // Ensure client get error
    }
6352
  }
6353
#endif
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#ifdef OPENSSL
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   if (options & REFRESH_DES_KEY_FILE)
   {
     if (des_key_file)
       result=load_des_key_file(des_key_file);
   }
#endif
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#ifdef HAVE_REPLICATION
6362 6363
 if (options & REFRESH_SLAVE)
 {
6364
   tmp_write_to_binlog= 0;
6365
   pthread_mutex_lock(&LOCK_active_mi);
6366
   if (reset_slave(thd, active_mi))
6367
     result=1;
6368
   pthread_mutex_unlock(&LOCK_active_mi);
6369
 }
6370
#endif
6371
 if (options & REFRESH_USER_RESOURCES)
6372
   reset_mqh((LEX_USER *) NULL, 0);             /* purecov: inspected */
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 *write_to_binlog= tmp_write_to_binlog;
6374
 return result;
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}

6377

6378
/*
6379
  kills a thread
6380 6381 6382 6383 6384

  SYNOPSIS
    kill_one_thread()
    thd			Thread class
    id			Thread id
6385
    only_kill_query     Should it kill the query or the connection
6386 6387 6388 6389 6390

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

6391
uint kill_one_thread(THD *thd, ulong id, bool only_kill_query)
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{
  THD *tmp;
  uint error=ER_NO_SUCH_THREAD;
6395 6396
  DBUG_ENTER("kill_one_thread");
  DBUG_PRINT("enter", ("id=%lu only_kill=%d", id, only_kill_query));
6397 6398
  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For unlink from list
  I_List_iterator<THD> it(threads);
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  while ((tmp=it++))
  {
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    if (tmp->command == COM_DAEMON)
      continue;
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    if (tmp->thread_id == id)
    {
6405 6406
      pthread_mutex_lock(&tmp->LOCK_delete);	// Lock from delete
      break;
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    }
  }
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
6410 6411
  if (tmp)
  {
6412 6413
    if ((thd->security_ctx->master_access & SUPER_ACL) ||
	!strcmp(thd->security_ctx->user, tmp->security_ctx->user))
6414
    {
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      tmp->awake(only_kill_query ? THD::KILL_QUERY : THD::KILL_CONNECTION);
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      error=0;
    }
    else
      error=ER_KILL_DENIED_ERROR;
    pthread_mutex_unlock(&tmp->LOCK_delete);
  }
6422 6423 6424 6425
  DBUG_PRINT("exit", ("%d", error));
  DBUG_RETURN(error);
}

6426

6427 6428 6429 6430 6431 6432 6433 6434 6435 6436 6437 6438 6439 6440
/*
  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)))
6441
    send_ok(thd);
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  else
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    my_error(error, MYF(0), id);
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}

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6447 6448
	/* If pointer is not a null pointer, append filename to it */

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bool append_file_to_dir(THD *thd, const char **filename_ptr,
                        const char *table_name)
6451
{
6452
  char buff[FN_REFLEN],*ptr, *end;
6453 6454 6455 6456 6457 6458 6459
  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))
  {
6460
    my_error(ER_WRONG_TABLE_NAME, MYF(0), *filename_ptr);
6461 6462 6463 6464
    return 1;
  }
  /* Fix is using unix filename format on dos */
  strmov(buff,*filename_ptr);
6465
  end=convert_dirname(buff, *filename_ptr, NullS);
6466
  if (!(ptr= (char*) thd->alloc((size_t) (end-buff) + strlen(table_name)+1)))
6467 6468
    return 1;					// End of memory
  *filename_ptr=ptr;
6469
  strxmov(ptr,buff,table_name,NullS);
6470 6471
  return 0;
}
6472

6473

6474 6475 6476 6477 6478 6479 6480 6481 6482 6483 6484 6485 6486 6487
/*
  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;
6488 6489
  LEX *lex= thd->lex;
  if (lex->current_select != &lex->select_lex)
6490 6491
  {
    char command[80];
6492 6493 6494
    Lex_input_stream *lip= thd->m_lip;
    strmake(command, lip->yylval->symbol.str,
	    min(lip->yylval->symbol.length, sizeof(command)-1));
6495
    my_error(ER_CANT_USE_OPTION_HERE, MYF(0), command);
6496 6497 6498 6499
    return 1;
  }
  return 0;
}
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Comp_creator *comp_eq_creator(bool invert)
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6503
{
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  return invert?(Comp_creator *)&ne_creator:(Comp_creator *)&eq_creator;
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}

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6507

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Comp_creator *comp_ge_creator(bool invert)
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6509
{
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  return invert?(Comp_creator *)&lt_creator:(Comp_creator *)&ge_creator;
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}

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

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

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

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

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

  RETURN VALUE
    constructed Item (or 0 if out of memory)
*/
Item * all_any_subquery_creator(Item *left_expr,
				chooser_compare_func_creator cmp,
				bool all,
				SELECT_LEX *select_lex)
{
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6556
  if ((cmp == &comp_eq_creator) && !all)       //  = ANY <=> IN
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    return new Item_in_subselect(left_expr, select_lex);
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6558 6559

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

  Item_allany_subselect *it=
6563
    new Item_allany_subselect(left_expr, cmp, select_lex, all);
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6564
  if (all)
6565
    return it->upper_item= new Item_func_not_all(it);	/* ALL */
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6566

6567
  return it->upper_item= new Item_func_nop_all(it);      /* ANY/SOME */
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}
6569 6570 6571 6572 6573 6574 6575


/*
  Multi update query pre-check

  SYNOPSIS
    multi_update_precheck()
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6576
    thd		Thread handler
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VIEW  
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6577
    tables	Global/local table list (have to be the same)
6578

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  RETURN VALUE
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    FALSE OK
    TRUE  Error
6582
*/
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bool multi_update_precheck(THD *thd, TABLE_LIST *tables)
6585 6586 6587 6588 6589
{
  const char *msg= 0;
  TABLE_LIST *table;
  LEX *lex= thd->lex;
  SELECT_LEX *select_lex= &lex->select_lex;
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VIEW  
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6590
  DBUG_ENTER("multi_update_precheck");
6591 6592 6593

  if (select_lex->item_list.elements != lex->value_list.elements)
  {
6594
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
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    DBUG_RETURN(TRUE);
6596 6597 6598 6599 6600
  }
  /*
    Ensure that we have UPDATE or SELECT privilege for each table
    The exact privilege is checked in mysql_multi_update()
  */
unknown's avatar
VIEW  
unknown committed
6601
  for (table= tables; table; table= table->next_local)
6602
  {
6603 6604 6605
    if (table->derived)
      table->grant.privilege= SELECT_ACL;
    else if ((check_access(thd, UPDATE_ACL, table->db,
6606 6607
                           &table->grant.privilege, 0, 1,
                           test(table->schema_table)) ||
6608
              check_grant(thd, UPDATE_ACL, table, 0, 1, 1)) &&
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             (check_access(thd, SELECT_ACL, table->db,
6610 6611
                           &table->grant.privilege, 0, 0,
                           test(table->schema_table)) ||
6612
              check_grant(thd, SELECT_ACL, table, 0, 1, 0)))
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      DBUG_RETURN(TRUE);
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VIEW  
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6615
    table->table_in_first_from_clause= 1;
6616
  }
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  /*
    Is there tables of subqueries?
  */
6620
  if (&lex->select_lex != lex->all_selects_list)
6621
  {
6622
    DBUG_PRINT("info",("Checking sub query list"));
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VIEW  
unknown committed
6623
    for (table= tables; table; table= table->next_global)
6624
    {
6625
      if (!table->table_in_first_from_clause)
6626 6627
      {
	if (check_access(thd, SELECT_ACL, table->db,
6628 6629
			 &table->grant.privilege, 0, 0,
                         test(table->schema_table)) ||
6630
	    check_grant(thd, SELECT_ACL, table, 0, 1, 0))
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	  DBUG_RETURN(TRUE);
6632 6633 6634 6635 6636 6637
      }
    }
  }

  if (select_lex->order_list.elements)
    msg= "ORDER BY";
6638
  else if (select_lex->select_limit)
6639 6640 6641 6642
    msg= "LIMIT";
  if (msg)
  {
    my_error(ER_WRONG_USAGE, MYF(0), "UPDATE", msg);
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6643
    DBUG_RETURN(TRUE);
6644
  }
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6645
  DBUG_RETURN(FALSE);
6646 6647 6648 6649 6650 6651 6652
}

/*
  Multi delete query pre-check

  SYNOPSIS
    multi_delete_precheck()
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6653
    thd			Thread handler
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VIEW  
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6654
    tables		Global/local table list
6655

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  RETURN VALUE
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    FALSE OK
    TRUE  error
6659
*/
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6661
bool multi_delete_precheck(THD *thd, TABLE_LIST *tables)
6662 6663 6664
{
  SELECT_LEX *select_lex= &thd->lex->select_lex;
  TABLE_LIST *aux_tables=
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    (TABLE_LIST *)thd->lex->auxiliary_table_list.first;
6666
  TABLE_LIST **save_query_tables_own_last= thd->lex->query_tables_own_last;
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VIEW  
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  DBUG_ENTER("multi_delete_precheck");
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6669 6670
  /* sql_yacc guarantees that tables and aux_tables are not zero */
  DBUG_ASSERT(aux_tables != 0);
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  if (check_table_access(thd, SELECT_ACL, tables, 0))
6672 6673 6674 6675 6676 6677 6678 6679 6680 6681 6682
    DBUG_RETURN(TRUE);

  /*
    Since aux_tables list is not part of LEX::query_tables list we
    have to juggle with LEX::query_tables_own_last value to be able
    call check_table_access() safely.
  */
  thd->lex->query_tables_own_last= 0;
  if (check_table_access(thd, DELETE_ACL, aux_tables, 0))
  {
    thd->lex->query_tables_own_last= save_query_tables_own_last;
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    DBUG_RETURN(TRUE);
6684 6685 6686
  }
  thd->lex->query_tables_own_last= save_query_tables_own_last;

6687 6688
  if ((thd->options & OPTION_SAFE_UPDATES) && !select_lex->where)
  {
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    my_message(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE,
               ER(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE), MYF(0));
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    DBUG_RETURN(TRUE);
6692
  }
6693 6694 6695 6696 6697 6698 6699 6700 6701 6702 6703 6704 6705 6706 6707 6708 6709 6710 6711 6712 6713 6714 6715 6716 6717
  DBUG_RETURN(FALSE);
}


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

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

  RETURN VALUE
    FALSE - success
    TRUE  - error
*/

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

  lex->table_count= 0;

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  for (target_tbl= (TABLE_LIST *)lex->auxiliary_table_list.first;
6719
       target_tbl; target_tbl= target_tbl->next_local)
6720
  {
6721
    lex->table_count++;
6722 6723
    /* All tables in aux_tables must be found in FROM PART */
    TABLE_LIST *walk;
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VIEW  
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6724
    for (walk= tables; walk; walk= walk->next_local)
6725
    {
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      if (!my_strcasecmp(table_alias_charset,
			 target_tbl->alias, walk->alias) &&
	  !strcmp(walk->db, target_tbl->db))
6729 6730 6731 6732
	break;
    }
    if (!walk)
    {
6733
      my_error(ER_UNKNOWN_TABLE, MYF(0),
6734
               target_tbl->table_name, "MULTI DELETE");
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      DBUG_RETURN(TRUE);
6736
    }
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    if (!walk->derived)
    {
      target_tbl->table_name= walk->table_name;
      target_tbl->table_name_length= walk->table_name_length;
    }
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    walk->updating= target_tbl->updating;
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    walk->lock_type= target_tbl->lock_type;
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    target_tbl->correspondent_table= walk;	// Remember corresponding table
6745
  }
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  DBUG_RETURN(FALSE);
6747 6748 6749
}


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/*
  simple UPDATE query pre-check

  SYNOPSIS
    update_precheck()
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6755 6756
    thd		Thread handler
    tables	Global table list
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6757 6758

  RETURN VALUE
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    FALSE OK
    TRUE  Error
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*/
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6762

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


/*
  simple DELETE query pre-check

  SYNOPSIS
    delete_precheck()
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6780 6781
    thd		Thread handler
    tables	Global table list
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6782 6783

  RETURN VALUE
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    FALSE  OK
    TRUE   error
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*/
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bool delete_precheck(THD *thd, TABLE_LIST *tables)
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{
  DBUG_ENTER("delete_precheck");
  if (check_one_table_access(thd, DELETE_ACL, tables))
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    DBUG_RETURN(TRUE);
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  /* Set privilege for the WHERE clause */
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  tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
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  DBUG_RETURN(FALSE);
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6796 6797 6798 6799 6800 6801 6802 6803
}


/*
  simple INSERT query pre-check

  SYNOPSIS
    insert_precheck()
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6804 6805
    thd		Thread handler
    tables	Global table list
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6806 6807

  RETURN VALUE
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    FALSE  OK
    TRUE   error
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*/
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6811

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

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  /*
    Check that we have modify privileges for the first table and
    select privileges for the rest
  */
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  ulong privilege= (INSERT_ACL |
                    (lex->duplicates == DUP_REPLACE ? DELETE_ACL : 0) |
                    (lex->value_list.elements ? UPDATE_ACL : 0));
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  if (check_one_table_access(thd, privilege, tables))
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    DBUG_RETURN(TRUE);
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6827

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  if (lex->update_list.elements != lex->value_list.elements)
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  {
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    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
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    DBUG_RETURN(TRUE);
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  }
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  DBUG_RETURN(FALSE);
6834
}
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6835 6836


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6837 6838 6839 6840 6841 6842 6843 6844 6845 6846 6847 6848 6849 6850 6851
/**
    @brief  Check privileges for SHOW CREATE TABLE statement.

    @param  thd    Thread context
    @param  table  Target table

    @retval TRUE  Failure
    @retval FALSE Success
*/

static bool check_show_create_table_access(THD *thd, TABLE_LIST *table)
{
  return check_access(thd, SELECT_ACL | EXTRA_ACL, table->db,
                      &table->grant.privilege, 0, 0,
                      test(table->schema_table)) ||
6852
         check_grant(thd, SELECT_ACL, table, 2, UINT_MAX, 0);
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6853 6854 6855
}


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/*
  CREATE TABLE query pre-check

  SYNOPSIS
    create_table_precheck()
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6861 6862 6863
    thd			Thread handler
    tables		Global table list
    create_table	Table which will be created
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6864 6865

  RETURN VALUE
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6866 6867
    FALSE   OK
    TRUE   Error
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6868
*/
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6869

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bool create_table_precheck(THD *thd, TABLE_LIST *tables,
                           TABLE_LIST *create_table)
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6872 6873
{
  LEX *lex= thd->lex;
6874 6875
  SELECT_LEX *select_lex= &lex->select_lex;
  ulong want_priv;
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6876
  bool error= TRUE;                                 // Error message is given
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  DBUG_ENTER("create_table_precheck");
6878 6879 6880

  want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
              CREATE_TMP_ACL : CREATE_ACL);
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  if (check_access(thd, want_priv, create_table->db,
6882 6883
		   &create_table->grant.privilege, 0, 0,
                   test(create_table->schema_table)) ||
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6884 6885 6886
      check_merge_table_access(thd, create_table->db,
			       (TABLE_LIST *)
			       lex->create_info.merge_list.first))
6887
    goto err;
6888
  if (want_priv != CREATE_TMP_ACL &&
6889
      check_grant(thd, want_priv, create_table, 0, 1, 0))
6890 6891 6892 6893 6894 6895
    goto err;

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

6896 6897
#ifdef NOT_NECESSARY_TO_CHECK_CREATE_TABLE_EXIST_WHEN_PREPARING_STATEMENT
    /* This code throws an ill error for CREATE TABLE t1 SELECT * FROM t1 */
6898
    /*
6899
      Only do the check for PS, because we on execute we have to check that
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6900 6901
      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).
6902
    */
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6903
    if (thd->stmt_arena->is_stmt_prepare_or_first_sp_execute())
6904
    {
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6905 6906 6907 6908
      /*
        For temporary tables we don't have to check if the created table exists
      */
      if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
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6909
          find_table_in_global_list(tables, create_table->db,
6910
                                    create_table->table_name))
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      {
6912
	error= FALSE;
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6913 6914 6915
        goto err;
      }
    }
6916
#endif
6917 6918 6919
    if (tables && check_table_access(thd, SELECT_ACL, tables,0))
      goto err;
  }
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  else if (lex->create_info.options & HA_LEX_CREATE_TABLE_LIKE)
  {
    if (check_show_create_table_access(thd, tables))
      goto err;
  }
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6925
  error= FALSE;
6926 6927 6928

err:
  DBUG_RETURN(error);
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6929
}
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6930 6931 6932 6933 6934 6935 6936


/*
  negate given expression

  SYNOPSIS
    negate_expression()
6937
    thd  thread handler
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6938 6939 6940 6941 6942 6943 6944 6945 6946 6947 6948 6949 6950 6951 6952 6953 6954 6955 6956 6957 6958 6959 6960 6961 6962 6963 6964 6965
    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);
}
6966

6967 6968
/*
  Set the specified definer to the default value, which is the current user in
6969
  the thread.
6970 6971 6972 6973 6974 6975 6976
 
  SYNOPSIS
    get_default_definer()
    thd       [in] thread handler
    definer   [out] definer
*/
 
6977
void get_default_definer(THD *thd, LEX_USER *definer)
6978 6979 6980 6981 6982 6983 6984 6985 6986 6987
{
  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);
}

6988

6989
/*
6990
  Create default definer for the specified THD.
6991 6992 6993 6994 6995 6996 6997 6998 6999 7000 7001 7002 7003 7004 7005 7006 7007 7008

  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;

7009
  get_default_definer(thd, definer);
7010 7011 7012 7013 7014

  return definer;
}


7015
/*
7016
  Create definer with the given user and host names.
7017 7018

  SYNOPSIS
7019 7020 7021 7022
    create_definer()
    thd         [in] thread handler
    user_name   [in] user name
    host_name   [in] host name
7023 7024

  RETURN
7025
    On success, return a valid pointer to the created and initialized
7026
    LEX_USER, which contains definer information.
7027
    On error, return 0.
7028 7029
*/

7030
LEX_USER *create_definer(THD *thd, LEX_STRING *user_name, LEX_STRING *host_name)
7031
{
7032 7033 7034 7035
  LEX_USER *definer;

  /* Create and initialize. */

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  if (! (definer= (LEX_USER*) thd->alloc(sizeof(LEX_USER))))
7037 7038 7039 7040 7041 7042
    return 0;

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

  return definer;
7043
}
7044 7045 7046 7047 7048 7049 7050 7051 7052 7053 7054 7055 7056 7057 7058 7059 7060 7061 7062


/*
  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
7063 7064
    return create_default_definer(thd);

7065 7066
  return user;
}
7067 7068 7069


/*
7070
  Check that byte length of a string does not exceed some limit.
7071 7072

  SYNOPSIS
7073 7074 7075 7076
  check_string_byte_length()
      str              string to be checked
      err_msg          error message to be displayed if the string is too long
      max_byte_length  max length in bytes
7077 7078 7079 7080

  RETURN
    FALSE   the passed string is not longer than max_length
    TRUE    the passed string is longer than max_length
7081 7082 7083

  NOTE
    The function is not used in existing code but can be useful later?
7084 7085
*/

7086 7087
bool check_string_byte_length(LEX_STRING *str, const char *err_msg,
                              uint max_byte_length)
7088
{
7089
  if (str->length <= max_byte_length)
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    return FALSE;
7091

7092 7093 7094 7095 7096 7097 7098 7099 7100 7101 7102 7103 7104 7105 7106 7107 7108 7109 7110 7111 7112 7113 7114 7115 7116 7117 7118 7119 7120 7121 7122 7123
  my_error(ER_WRONG_STRING_LENGTH, MYF(0), str->str, err_msg, max_byte_length);

  return TRUE;
}


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

  SYNOPSIS
  check_string_char_length()
      str              string to be checked
      err_msg          error message to be displayed if the string is too long
      max_char_length  max length in symbols
      cs               string charset

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


bool check_string_char_length(LEX_STRING *str, const char *err_msg,
                              uint max_char_length, CHARSET_INFO *cs,
                              bool no_error)
{
  int well_formed_error;
  uint res= cs->cset->well_formed_len(cs, str->str, str->str + str->length,
                                      max_char_length, &well_formed_error);

  if (!well_formed_error &&  str->length == res)
    return FALSE;
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7125 7126
  if (!no_error)
    my_error(ER_WRONG_STRING_LENGTH, MYF(0), str->str, err_msg, max_char_length);
7127 7128
  return TRUE;
}