sql_parse.cc 211 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;
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  sql_command_flags[SQLCOM_ALTER_TABLE]=    CF_CHANGES_DATA | CF_WRITE_LOGS_COMMAND;
  sql_command_flags[SQLCOM_TRUNCATE]=       CF_CHANGES_DATA | CF_WRITE_LOGS_COMMAND;
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  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;
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  sql_command_flags[SQLCOM_DROP_EVENT]=     CF_CHANGES_DATA;
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  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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  /*
    The following admin table operations are allowed
    on log tables.
  */
  sql_command_flags[SQLCOM_REPAIR]=           CF_WRITE_LOGS_COMMAND;
  sql_command_flags[SQLCOM_OPTIMIZE]=         CF_WRITE_LOGS_COMMAND;
  sql_command_flags[SQLCOM_ANALYZE]=          CF_WRITE_LOGS_COMMAND;
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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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/**
  Check if a sql command is allowed to write to log tables.
  @param command The SQL command
  @return true if writing is allowed
*/
bool is_log_table_write_query(enum enum_sql_command command)
{
  DBUG_ASSERT(command >= 0 && command <= SQLCOM_END);
  return (sql_command_flags[command] & CF_WRITE_LOGS_COMMAND) != 0;
}

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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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504

505
  if (check_db_name(db))
506
  {
507 508
    /* purecov: begin inspected */
    my_error(ER_WRONG_DB_NAME ,MYF(0), db->str ? db->str : "NULL");
509
    goto err;
510
    /* purecov: end */
511
  }
512
  if (lower_case_table_names)
513
    my_casedn_str(files_charset_info, tbl_name);
514

515
  if (!(table=open_ltable(thd, table_list, TL_READ_NO_INSERT, 0)))
516 517
    DBUG_RETURN(1);

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518
  if (check_one_table_access(thd, SELECT_ACL, table_list))
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519 520
    goto err;
  thd->free_list = 0;
521
  thd->query_length=(uint) strlen(tbl_name);
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522
  thd->query = tbl_name;
523
  if ((error = mysqld_dump_create_info(thd, table_list, -1)))
524
  {
525
    my_error(ER_GET_ERRNO, MYF(0), my_errno);
526 527
    goto err;
  }
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528
  net_flush(&thd->net);
529
  if ((error= table->file->dump(thd,-1)))
530
    my_error(ER_GET_ERRNO, MYF(0), error);
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531

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err:
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  DBUG_RETURN(error);
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534 535
}

536 537 538 539
/*
  Ends the current transaction and (maybe) begin the next

  SYNOPSIS
540
    end_trans()
541 542 543 544 545 546 547
      thd            Current thread
      completion     Completion type

  RETURN
    0 - OK
*/

548
int end_trans(THD *thd, enum enum_mysql_completiontype completion)
549 550 551
{
  bool do_release= 0;
  int res= 0;
552
  DBUG_ENTER("end_trans");
553

554
  if (unlikely(thd->in_sub_stmt))
555 556 557 558
  {
    my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0));
    DBUG_RETURN(1);
  }
559 560 561 562 563 564
  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);
  }
565 566 567 568 569 570 571 572
  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;
573
    res= ha_commit(thd);
574
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_KEEP_LOG);
575
    thd->no_trans_update.all= FALSE;
576 577
    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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585
    do_release= 1; /* fall through */
586 587 588 589
  case ROLLBACK:
  case ROLLBACK_AND_CHAIN:
  {
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
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590
    if (ha_rollback(thd))
591
      res= -1;
592
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_KEEP_LOG);
593
    thd->no_trans_update.all= FALSE;
594 595 596 597 598 599 600 601 602
    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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603

604 605 606
  if (res < 0)
    my_error(thd->killed_errno(), MYF(0));
  else if ((res == 0) && do_release)
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607 608
    thd->killed= THD::KILL_CONNECTION;

609 610
  DBUG_RETURN(res);
}
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611

612
#ifndef EMBEDDED_LIBRARY
613 614

/*
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615
  Read one command from connection and execute it (query or simple command).
616 617 618 619 620 621 622 623
  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;
627
  ulong packet_length;
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  NET *net= &thd->net;
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629 630 631
  enum enum_server_command command;
  DBUG_ENTER("do_command");

632 633 634 635
  /*
    indicator of uninitialized lex => normal flow of errors handling
    (see my_message_sql)
  */
636
  thd->lex->current_select= 0;
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637

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638 639 640 641 642 643
  /*
    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
  */
644
  my_net_set_read_timeout(net, thd->variables.net_wait_timeout);
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645

646
  thd->clear_error();				// Clear error message
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647 648 649 650

  net_new_transaction(net);
  if ((packet_length=my_net_read(net)) == packet_error)
  {
651 652 653 654 655
    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)
656 657
    {
      statistic_increment(aborted_threads,&LOCK_status);
658
      DBUG_RETURN(TRUE);			// We have to close it.
659
    }
660
    net_send_error(thd, net->last_errno, NullS);
661
    net->error= 0;
662
    DBUG_RETURN(FALSE);
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663 664 665 666 667
  }
  else
  {
    packet=(char*) net->read_pos;
    command = (enum enum_server_command) (uchar) packet[0];
668 669
    if (command >= COM_END)
      command= COM_END;				// Wrong command
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670 671
    DBUG_PRINT("info",("Command on %s = %d (%s)",
		       vio_description(net->vio), command,
672
		       command_name[command].str));
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673
  }
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  /* Restore read timeout value */
676
  my_net_set_read_timeout(net, thd->variables.net_read_timeout);
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678 679 680 681 682 683 684 685 686
  /*
    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.
  */
687
  DBUG_RETURN(dispatch_command(command,thd, packet+1, (uint) packet_length));
688
}
689
#endif  /* EMBEDDED_LIBRARY */
690

691

692 693
/*
   Perform one connection-level (COM_XXXX) command.
694

695 696 697 698 699 700 701 702 703 704 705 706 707
  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
*/
708

709 710 711 712
bool dispatch_command(enum enum_server_command command, THD *thd,
		      char* packet, uint packet_length)
{
  NET *net= &thd->net;
713
  bool error= 0;
714 715
  DBUG_ENTER("dispatch_command");

716
  if (thd->killed == THD::KILL_QUERY || thd->killed == THD::KILL_BAD_DATA)
717
  {
718
    thd->killed= THD::NOT_KILLED;
719 720
    thd->mysys_var->abort= 0;
  }
721

722
  thd->command=command;
723
  /*
724 725
    Commands which always take a long time are logged into
    the slow log only if opt_log_slow_admin_statements is set.
726
  */
727
  thd->enable_slow_log= TRUE;
728
  thd->lex->sql_command= SQLCOM_END; /* to avoid confusing VIEW detectors */
729
  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)
733
    next_query_id();
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734
  thread_running++;
735
  /* TODO: set thd->lex->sql_command to SQLCOM_END here */
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736
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
737

738 739
  thd->server_status&=
           ~(SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED);
740
  switch (command) {
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741
  case COM_INIT_DB:
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  {
    LEX_STRING tmp;
744
    status_var_increment(thd->status_var.com_stat[SQLCOM_CHANGE_DB]);
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745
    thd->convert_string(&tmp, system_charset_info,
746
			packet, packet_length-1, thd->charset());
747
    if (!mysql_change_db(thd, &tmp, FALSE))
748
    {
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749
      general_log_print(thd, command, "%s",thd->db);
750 751
      send_ok(thd);
    }
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    break;
  }
754
#ifdef HAVE_REPLICATION
755 756
  case COM_REGISTER_SLAVE:
  {
757
    if (!register_slave(thd, (uchar*)packet, packet_length))
758
      send_ok(thd);
759 760
    break;
  }
761
#endif
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  case COM_TABLE_DUMP:
763
  {
764 765
    char *tbl_name;
    LEX_STRING db;
766
    uint db_len= *(uchar*) packet;
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    if (db_len >= packet_length || db_len > NAME_LEN)
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768
    {
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      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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      break;
    }
772
    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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776 777
      break;
    }
778

779
    status_var_increment(thd->status_var.com_other);
780
    thd->enable_slow_log= opt_log_slow_admin_statements;
781
    db.str= (char*) thd->alloc(db_len + tbl_len + 2);
782
    if (!db.str)
783 784 785 786
    {
      my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
      break;
    }
787
    db.length= db_len;
788
    tbl_name= strmake(db.str, packet + 1, db_len)+1;
789
    strmake(tbl_name, packet + db_len + 2, tbl_len);
790
    mysql_table_dump(thd, &db, tbl_name);
791 792
    break;
  }
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  case COM_CHANGE_USER:
  {
795
    status_var_increment(thd->status_var.com_other);
796 797 798
    char *user= (char*) packet, *packet_end= packet+ packet_length;
    char *passwd= strend(user)+1;

799
    thd->change_user();
800
    thd->clear_error();                         // if errors from rollback
801

802
    /*
803 804 805
      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).
806 807 808

      Cast *passwd to an unsigned char, so that it doesn't extend the sign
      for *passwd > 127 and become 2**32-127 after casting to uint.
809
    */
810
    char db_buff[NAME_LEN+1];                 // buffer to store db in utf8
811
    char *db= passwd;
812 813
    char *save_db;
    uint passwd_len= (thd->client_capabilities & CLIENT_SECURE_CONNECTION ?
814
                      (uchar)(*passwd++) : strlen(passwd));
815 816
    uint dummy_errors, save_db_length, db_length;
    int res;
817 818 819
    Security_context save_security_ctx= *thd->security_ctx;
    USER_CONN *save_user_connect;

820
    db+= passwd_len + 1;
821
#ifndef EMBEDDED_LIBRARY
822
    /* Small check for incoming packet */
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823
    if ((uint) ((uchar*) db - net->read_pos) > packet_length)
824
    {
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825
      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
826 827
      break;
    }
828
#endif
829
    /* Convert database name to utf8 */
830 831 832 833 834 835 836
    /*
      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--;
837
    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
838
                             system_charset_info, db, db_length,
839
                             thd->charset(), &dummy_errors)]= 0;
840
    db= db_buff;
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841

842
    /* Save user and privileges */
843 844 845
    save_db_length= thd->db_length;
    save_db= thd->db;
    save_user_connect= thd->user_connect;
846 847

    if (!(thd->security_ctx->user= my_strdup(user, MYF(0))))
848
    {
849
      thd->security_ctx->user= save_security_ctx.user;
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850
      my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
851 852
      break;
    }
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853

854 855
    /* Clear variables that are allocated */
    thd->user_connect= 0;
856
    res= check_user(thd, COM_CHANGE_USER, passwd, passwd_len, db, FALSE);
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857

858 859
    if (res)
    {
860
      /* authentication failure, we shall restore old user */
861
      if (res > 0)
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862
        my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
863 864
      else
        thd->clear_error();                     // Error already sent to client
865 866
      x_free(thd->security_ctx->user);
      *thd->security_ctx= save_security_ctx;
867
      thd->user_connect= save_user_connect;
868 869 870 871 872
      thd->db= save_db;
      thd->db_length= save_db_length;
    }
    else
    {
873
#ifndef NO_EMBEDDED_ACCESS_CHECKS
874
      /* we've authenticated new user */
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875 876
      if (save_user_connect)
	decrease_user_connections(save_user_connect);
877
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
878 879
      x_free((uchar*) save_db);
      x_free((uchar*)  save_security_ctx.user);
880
    }
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881 882
    break;
  }
883
  case COM_STMT_EXECUTE:
884
  {
885
    mysql_stmt_execute(thd, packet, packet_length);
886 887
    break;
  }
888
  case COM_STMT_FETCH:
889 890 891 892
  {
    mysql_stmt_fetch(thd, packet, packet_length);
    break;
  }
893
  case COM_STMT_SEND_LONG_DATA:
894
  {
895
    mysql_stmt_get_longdata(thd, packet, packet_length);
896 897
    break;
  }
898
  case COM_STMT_PREPARE:
899
  {
900
    mysql_stmt_prepare(thd, packet, packet_length);
901 902
    break;
  }
903
  case COM_STMT_CLOSE:
904
  {
905
    mysql_stmt_close(thd, packet);
906 907
    break;
  }
908
  case COM_STMT_RESET:
909 910 911 912
  {
    mysql_stmt_reset(thd, packet);
    break;
  }
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913 914
  case COM_QUERY:
  {
915 916
    if (alloc_query(thd, packet, packet_length))
      break;					// fatal error is set
917
    char *packet_end= thd->query + thd->query_length;
918 919
    /* 'b' stands for 'buffer' parameter', special for 'my_snprintf' */
    const char *format= "%.*b";
920 921
    const char* found_semicolon= NULL;

922
    general_log_print(thd, command, format, thd->query_length, thd->query);
923
    DBUG_PRINT("query",("%-.4096s",thd->query));
924 925 926 927

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

928
    mysql_parse(thd, thd->query, thd->query_length, & found_semicolon);
929

930
    while (!thd->killed && found_semicolon && !thd->net.report_error)
931
    {
932
      char *next_packet= (char*) found_semicolon;
933
      net->no_send_error= 0;
934
      /*
935 936
        Multiple queries exits, execute them individually
      */
937 938
      if (thd->lock || thd->open_tables || thd->derived_tables ||
          thd->prelocked_mode)
939
        close_thread_tables(thd);
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940
      ulong length= (ulong)(packet_end - next_packet);
941

942
      log_slow_statement(thd);
943

944
      /* Remove garbage at start of query */
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945
      while (my_isspace(thd->charset(), *next_packet) && length > 0)
946
      {
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947
        next_packet++;
948 949
        length--;
      }
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950
      VOID(pthread_mutex_lock(&LOCK_thread_count));
951
      thd->query_length= length;
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952
      thd->query= next_packet;
953
      thd->query_id= next_query_id();
954
      thd->set_time(); /* Reset the query start time. */
955
      /* TODO: set thd->lex->sql_command to SQLCOM_END here */
956
      VOID(pthread_mutex_unlock(&LOCK_thread_count));
957
      mysql_parse(thd, next_packet, length, & found_semicolon);
958 959
    }

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960 961 962 963 964
    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),WAIT_PRIOR);
    DBUG_PRINT("info",("query ready"));
    break;
  }
965
  case COM_FIELD_LIST:				// This isn't actually needed
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966
#ifdef DONT_ALLOW_SHOW_COMMANDS
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967 968
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0));	/* purecov: inspected */
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969 970 971
    break;
#else
  {
972
    char *fields, *packet_end= packet + packet_length - 1, *arg_end;
973
    /* Locked closure of all tables */
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974
    TABLE_LIST table_list;
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975
    LEX_STRING conv_name;
976
    size_t dummy;
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977

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978
    /* used as fields initializator */
979
    lex_start(thd);
980

981
    status_var_increment(thd->status_var.com_stat[SQLCOM_SHOW_FIELDS]);
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982
    bzero((char*) &table_list,sizeof(table_list));
983
    if (thd->copy_db_to(&table_list.db, &dummy))
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984
      break;
985 986 987 988
    /*
      We have name + wildcard in packet, separated by endzero
    */
    arg_end= strend(packet);
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989
    thd->convert_string(&conv_name, system_charset_info,
990
			packet, (uint) (arg_end - packet), thd->charset());
991
    table_list.alias= table_list.table_name= conv_name.str;
992
    packet= arg_end + 1;
993 994

    if (!my_strcasecmp(system_charset_info, table_list.db,
995
                       INFORMATION_SCHEMA_NAME.str))
996 997 998 999 1000 1001
    {
      ST_SCHEMA_TABLE *schema_table= find_schema_table(thd, table_list.alias);
      if (schema_table)
        table_list.schema_table= schema_table;
    }

1002
    thd->query_length= (uint) (packet_end - packet); // Don't count end \0
1003
    if (!(thd->query=fields= (char*) thd->memdup(packet,thd->query_length+1)))
1004
      break;
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1005
    general_log_print(thd, command, "%s %s", table_list.table_name, fields);
1006
    if (lower_case_table_names)
1007
      my_casedn_str(files_charset_info, table_list.table_name);
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1008

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1009
    if (check_access(thd,SELECT_ACL,table_list.db,&table_list.grant.privilege,
1010
		     0, 0, test(table_list.schema_table)))
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1011
      break;
1012
    if (check_grant(thd, SELECT_ACL, &table_list, 2, UINT_MAX, 0))
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1013
      break;
1014 1015
    /* init structures for VIEW processing */
    table_list.select_lex= &(thd->lex->select_lex);
1016 1017 1018 1019

    lex_start(thd);
    mysql_reset_thd_for_next_command(thd);

1020
    thd->lex->
1021 1022
      select_lex.table_list.link_in_list((uchar*) &table_list,
                                         (uchar**) &table_list.next_local);
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1023
    thd->lex->add_to_query_tables(&table_list);
1024

1025 1026
    /* switch on VIEW optimisation: do not fill temporary tables */
    thd->lex->sql_command= SQLCOM_SHOW_FIELDS;
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1027
    mysqld_list_fields(thd,&table_list,fields);
1028
    thd->lex->unit.cleanup();
1029
    thd->cleanup_after_query();
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1030 1031 1032 1033
    break;
  }
#endif
  case COM_QUIT:
1034
    /* We don't calculate statistics for this command */
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1035
    general_log_print(thd, command, NullS);
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1036 1037 1038 1039
    net->error=0;				// Don't give 'abort' message
    error=TRUE;					// End server
    break;

1040
#ifdef REMOVED
1041
  case COM_CREATE_DB:				// QQ: To be removed
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1042
    {
1043
      LEX_STRING db, alias;
1044
      HA_CREATE_INFO create_info;
1045

1046
      status_var_increment(thd->status_var.com_stat[SQLCOM_CREATE_DB]);
1047 1048
      if (thd->make_lex_string(&db, packet, packet_length - 1, FALSE) ||
          thd->make_lex_string(&alias, db.str, db.length, FALSE) ||
1049
          check_db_name(&db))
1050
      {
1051
	my_error(ER_WRONG_DB_NAME, MYF(0), db.str ? db.str : "NULL");
1052 1053
	break;
      }
1054 1055
      if (check_access(thd, CREATE_ACL, db.str , 0, 1, 0,
                       is_schema_db(db.str)))
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1056
	break;
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1057
      general_log_print(thd, command, packet);
1058
      bzero(&create_info, sizeof(create_info));
1059
      mysql_create_db(thd, (lower_case_table_names == 2 ? alias.str : db.str),
1060
                      &create_info, 0);
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1061 1062
      break;
    }
1063
  case COM_DROP_DB:				// QQ: To be removed
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1064
    {
1065
      status_var_increment(thd->status_var.com_stat[SQLCOM_DROP_DB]);
1066 1067
      LEX_STRING db;

1068
      if (thd->make_lex_string(&db, packet, packet_length - 1, FALSE) ||
1069
          check_db_name(&db))
1070
      {
1071
	my_error(ER_WRONG_DB_NAME, MYF(0), db.str ? db.str : "NULL");
1072 1073
	break;
      }
1074
      if (check_access(thd, DROP_ACL, db.str, 0, 1, 0, is_schema_db(db.str)))
1075
	break;
1076 1077
      if (thd->locked_tables || thd->active_transaction())
      {
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1078 1079
	my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                   ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
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1080
	break;
1081
      }
1082 1083
      general_log_print(thd, command, db.str);
      mysql_rm_db(thd, db.str, 0, 0);
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1084 1085
      break;
    }
1086
#endif
1087
#ifndef EMBEDDED_LIBRARY
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1088 1089
  case COM_BINLOG_DUMP:
    {
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1090 1091 1092 1093
      ulong pos;
      ushort flags;
      uint32 slave_server_id;

1094
      status_var_increment(thd->status_var.com_other);
1095
      thd->enable_slow_log= opt_log_slow_admin_statements;
1096
      if (check_global_access(thd, REPL_SLAVE_ACL))
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1097
	break;
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1098

1099
      /* TODO: The following has to be changed to an 8 byte integer */
1100 1101
      pos = uint4korr(packet);
      flags = uint2korr(packet + 4);
1102
      thd->server_id=0; /* avoid suicide */
1103
      if ((slave_server_id= uint4korr(packet+6))) // mysqlbinlog.server_id==0
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1104
	kill_zombie_dump_threads(slave_server_id);
1105
      thd->server_id = slave_server_id;
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1106

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1107
      general_log_print(thd, command, "Log: '%s'  Pos: %ld", packet+10,
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1108
                      (long) pos);
1109
      mysql_binlog_send(thd, thd->strdup(packet + 10), (my_off_t) pos, flags);
1110
      unregister_slave(thd,1,1);
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1111
      /*  fake COM_QUIT -- if we get here, the thread needs to terminate */
1112 1113
      error = TRUE;
      net->error = 0;
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1114 1115
      break;
    }
1116
#endif
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1117
  case COM_REFRESH:
1118 1119
  {
    bool not_used;
1120
    status_var_increment(thd->status_var.com_stat[SQLCOM_FLUSH]);
1121 1122
    ulong options= (ulong) (uchar) packet[0];
    if (check_global_access(thd,RELOAD_ACL))
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1123
      break;
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1124
    general_log_print(thd, command, NullS);
1125 1126 1127 1128
    if (!reload_acl_and_cache(thd, options, (TABLE_LIST*) 0, &not_used))
      send_ok(thd);
    break;
  }
1129
#ifndef EMBEDDED_LIBRARY
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1130
  case COM_SHUTDOWN:
1131
  {
1132
    status_var_increment(thd->status_var.com_other);
1133
    if (check_global_access(thd,SHUTDOWN_ACL))
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1134
      break; /* purecov: inspected */
1135
    /*
1136 1137 1138 1139
      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].
1140
    */
1141 1142
    enum mysql_enum_shutdown_level level=
      (enum mysql_enum_shutdown_level) (uchar) packet[0];
1143 1144 1145 1146 1147 1148 1149
    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;
    }
1150
    DBUG_PRINT("quit",("Got shutdown command for level %u", level));
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1151
    general_log_print(thd, command, NullS);
1152
    send_eof(thd);
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1153 1154 1155
#ifdef __WIN__
    sleep(1);					// must wait after eof()
#endif
1156 1157 1158 1159 1160 1161
    /*
      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);
1162
    close_connection(thd, 0, 1);
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1163 1164 1165 1166
    close_thread_tables(thd);			// Free before kill
    kill_mysql();
    error=TRUE;
    break;
1167
  }
1168
#endif
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1169 1170
  case COM_STATISTICS:
  {
1171 1172 1173
    STATUS_VAR current_global_status_var;
    ulong uptime;
    uint length;
1174
    ulonglong queries_per_second1000;
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1175
#ifndef EMBEDDED_LIBRARY
1176 1177
    char buff[250];
    uint buff_len= sizeof(buff);
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1178 1179
#else
    char *buff= thd->net.last_error;
1180
    uint buff_len= sizeof(thd->net.last_error);
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1181
#endif
1182

1183
    general_log_print(thd, command, NullS);
1184
    status_var_increment(thd->status_var.com_stat[SQLCOM_SHOW_STATUS]);
1185
    calc_sum_of_all_status(&current_global_status_var);
1186 1187 1188 1189 1190
    if (!(uptime= (ulong) (thd->start_time - server_start_time)))
      queries_per_second1000= 0;
    else
      queries_per_second1000= thd->query_id * LL(1000) / uptime;

1191 1192 1193
    length= my_snprintf((char*) buff, buff_len - 1,
                        "Uptime: %lu  Threads: %d  Questions: %lu  "
                        "Slow queries: %lu  Opens: %lu  Flush tables: %lu  "
1194
                        "Open tables: %u  Queries per second avg: %u.%u",
1195 1196 1197 1198 1199 1200
                        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(),
1201 1202
                        (uint) (queries_per_second1000 / 1000),
                        (uint) (queries_per_second1000 % 1000));
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1203
#ifdef SAFEMALLOC
1204
    if (sf_malloc_cur_memory)				// Using SAFEMALLOC
1205 1206 1207 1208 1209 1210 1211
    {
      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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1212 1213
#endif
#ifndef EMBEDDED_LIBRARY
1214
    VOID(my_net_write(net, (uchar*) buff, length));
1215
      VOID(net_flush(net));
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1216
#endif
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1217 1218 1219
    break;
  }
  case COM_PING:
1220
    status_var_increment(thd->status_var.com_other);
1221
    send_ok(thd);				// Tell client we are alive
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1222 1223
    break;
  case COM_PROCESS_INFO:
1224
    status_var_increment(thd->status_var.com_stat[SQLCOM_SHOW_PROCESSLIST]);
1225 1226
    if (!thd->security_ctx->priv_user[0] &&
        check_global_access(thd, PROCESS_ACL))
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1227
      break;
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1228
    general_log_print(thd, command, NullS);
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1229
    mysqld_list_processes(thd,
1230 1231
			  thd->security_ctx->master_access & PROCESS_ACL ? 
			  NullS : thd->security_ctx->priv_user, 0);
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1232 1233 1234
    break;
  case COM_PROCESS_KILL:
  {
1235
    status_var_increment(thd->status_var.com_stat[SQLCOM_KILL]);
1236
    ulong id=(ulong) uint4korr(packet);
1237
    sql_kill(thd,id,false);
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1238 1239
    break;
  }
1240 1241
  case COM_SET_OPTION:
  {
1242
    status_var_increment(thd->status_var.com_stat[SQLCOM_SET_OPTION]);
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1243 1244 1245 1246
    uint opt_command= uint2korr(packet);

    switch (opt_command) {
    case (int) MYSQL_OPTION_MULTI_STATEMENTS_ON:
1247
      thd->client_capabilities|= CLIENT_MULTI_STATEMENTS;
1248
      send_eof(thd);
1249
      break;
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1250
    case (int) MYSQL_OPTION_MULTI_STATEMENTS_OFF:
1251
      thd->client_capabilities&= ~CLIENT_MULTI_STATEMENTS;
1252
      send_eof(thd);
1253 1254
      break;
    default:
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1255
      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
1256 1257 1258 1259
      break;
    }
    break;
  }
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1260
  case COM_DEBUG:
1261
    status_var_increment(thd->status_var.com_other);
1262
    if (check_global_access(thd, SUPER_ACL))
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1263
      break;					/* purecov: inspected */
1264
    mysql_print_status();
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1265
    general_log_print(thd, command, NullS);
1266
    send_eof(thd);
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1267 1268 1269 1270 1271
    break;
  case COM_SLEEP:
  case COM_CONNECT:				// Impossible here
  case COM_TIME:				// Impossible from client
  case COM_DELAYED_INSERT:
1272
  case COM_END:
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1273
  default:
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1274
    my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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1275 1276
    break;
  }
1277 1278
  if (thd->lock || thd->open_tables || thd->derived_tables ||
      thd->prelocked_mode)
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1279 1280 1281 1282
  {
    thd->proc_info="closing tables";
    close_thread_tables(thd);			/* Free tables */
  }
1283 1284 1285 1286 1287 1288 1289 1290 1291 1292
  /*
    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())
1293
    thd->transaction.xid_state.xid.null();
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1294

1295 1296 1297
  /* report error issued during command execution */
  if (thd->killed_errno() && !thd->net.report_error)
    thd->send_kill_message();
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1298
  if (thd->net.report_error)
1299
    net_send_error(thd);
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1300

1301
  log_slow_statement(thd);
1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316

  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);
}


1317
void log_slow_statement(THD *thd)
1318
{
1319
  time_t start_of_query;
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1320
  DBUG_ENTER("log_slow_statement");
1321 1322 1323 1324 1325 1326 1327

  /*
    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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1328
    DBUG_VOID_RETURN;                           // Don't set time for sub stmt
1329 1330

  start_of_query= thd->start_time;
1331
  thd->end_time();				// Set start time
1332

1333 1334 1335 1336 1337
  /*
    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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1338
  {
1339 1340
    thd->proc_info="logging slow query";

1341 1342
    if ((ulong) (thd->start_time - thd->time_after_lock) >
	thd->variables.long_query_time ||
1343 1344
	((thd->server_status &
	  (SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED)) &&
1345
	 opt_log_queries_not_using_indexes))
1346
    {
1347
      thd->status_var.long_query_count++;
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1348
      slow_log_print(thd, thd->query, thd->query_length, start_of_query);
1349
    }
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1350
  }
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1351
  DBUG_VOID_RETURN;
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1352 1353
}

1354

1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382
/*
  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.
*/

1383 1384 1385
int prepare_schema_table(THD *thd, LEX *lex, Table_ident *table_ident,
                         enum enum_schema_tables schema_table_idx)
{
1386
  SELECT_LEX *schema_select_lex= NULL;
1387
  DBUG_ENTER("prepare_schema_table");
1388

1389
  switch (schema_table_idx) {
1390 1391
  case SCH_SCHEMATA:
#if defined(DONT_ALLOW_SHOW_COMMANDS)
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1392 1393
    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0));   /* purecov: inspected */
1394 1395 1396 1397
    DBUG_RETURN(1);
#else
    break;
#endif
1398

1399 1400 1401
  case SCH_TABLE_NAMES:
  case SCH_TABLES:
  case SCH_VIEWS:
1402
  case SCH_TRIGGERS:
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1403
  case SCH_EVENTS:
1404
#ifdef DONT_ALLOW_SHOW_COMMANDS
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1405 1406
    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */
1407 1408 1409
    DBUG_RETURN(1);
#else
    {
1410
      LEX_STRING db;
1411
      size_t dummy;
1412
      if (lex->select_lex.db == NULL &&
1413
          lex->copy_db_to(&lex->select_lex.db, &dummy))
1414
      {
1415
        DBUG_RETURN(1);
1416
      }
1417 1418 1419
      schema_select_lex= new SELECT_LEX();
      db.str= schema_select_lex->db= lex->select_lex.db;
      schema_select_lex->table_list.first= NULL;
1420
      db.length= strlen(db.str);
1421

1422
      if (check_db_name(&db))
1423
      {
1424
        my_error(ER_WRONG_DB_NAME, MYF(0), db.str);
1425 1426 1427 1428 1429 1430 1431
        DBUG_RETURN(1);
      }
      break;
    }
#endif
  case SCH_COLUMNS:
  case SCH_STATISTICS:
1432
  {
1433
#ifdef DONT_ALLOW_SHOW_COMMANDS
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1434 1435
    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */
1436 1437
    DBUG_RETURN(1);
#else
1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448
    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;
  }
1449
#endif
1450 1451 1452
  case SCH_OPEN_TABLES:
  case SCH_VARIABLES:
  case SCH_STATUS:
1453 1454
  case SCH_PROCEDURES:
  case SCH_CHARSETS:
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1455
  case SCH_ENGINES:
1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473
  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;
1474
  table_list->schema_select_lex= schema_select_lex;
1475
  table_list->schema_table_reformed= 1;
1476 1477 1478 1479
  DBUG_RETURN(0);
}


1480 1481
/*
  Read query from packet and store in thd->query
1482
  Used in COM_QUERY and COM_STMT_PREPARE
1483 1484 1485 1486 1487 1488 1489

  DESCRIPTION
    Sets the following THD variables:
      query
      query_length

  RETURN VALUES
1490 1491
    FALSE ok
    TRUE  error;  In this case thd->fatal_error is set
1492 1493
*/

1494
bool alloc_query(THD *thd, const char *packet, uint packet_length)
1495 1496
{
  packet_length--;				// Remove end null
1497
  /* Remove garbage at start and end of query */
1498
  while (my_isspace(thd->charset(),packet[0]) && packet_length > 0)
1499 1500 1501 1502
  {
    packet++;
    packet_length--;
  }
1503
  const char *pos= packet + packet_length;     // Point at end null
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1504
  while (packet_length > 0 &&
1505
	 (pos[-1] == ';' || my_isspace(thd->charset() ,pos[-1])))
1506 1507 1508 1509 1510
  {
    pos--;
    packet_length--;
  }
  /* We must allocate some extra memory for query cache */
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1511
  thd->query_length= 0;                        // Extra safety: Avoid races
1512
  if (!(thd->query= (char*) thd->memdup_w_gap((uchar*) (packet),
1513
					      packet_length,
1514 1515
					      thd->db_length+ 1 +
					      QUERY_CACHE_FLAGS_SIZE)))
1516
    return TRUE;
1517 1518
  thd->query[packet_length]=0;
  thd->query_length= packet_length;
1519 1520 1521 1522

  /* Reclaim some memory */
  thd->packet.shrink(thd->variables.net_buffer_length);
  thd->convert_buffer.shrink(thd->variables.net_buffer_length);
1523

1524
  return FALSE;
1525 1526
}

1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539
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;
1540
  thd->variables.lc_time_names= &my_locale_en_US;
1541 1542 1543
  thd->one_shot_set= 0;
}

1544

1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590
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);

1591
    if (thd->slave_thread && lex->sphead)
1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629
      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);
}


1630
/*
1631
  Execute command saved in thd and lex->sql_command
1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652

  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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1653

1654
bool
1655
mysql_execute_command(THD *thd)
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1656
{
1657 1658
  bool res= FALSE;
  bool need_start_waiting= FALSE; // have protection against global read lock
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1659
  int  up_result= 0;
1660
  LEX  *lex= thd->lex;
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1661
  /* first SELECT_LEX (have special meaning for many of non-SELECTcommands) */
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1662
  SELECT_LEX *select_lex= &lex->select_lex;
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1663
  /* first table of first SELECT_LEX */
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1664
  TABLE_LIST *first_table= (TABLE_LIST*) select_lex->table_list.first;
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1665 1666 1667
  /* list of all tables in query */
  TABLE_LIST *all_tables;
  /* most outer SELECT_LEX_UNIT of query */
1668
  SELECT_LEX_UNIT *unit= &lex->unit;
1669
  /* Saved variable value */
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1670
  DBUG_ENTER("mysql_execute_command");
1671
  thd->net.no_send_error= 0;
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1672 1673 1674
#ifdef WITH_PARTITION_STORAGE_ENGINE
  thd->work_part_info= 0;
#endif
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1675

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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();
1692
  /* should be assigned after making first tables same */
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1693
  all_tables= lex->query_tables;
1694 1695 1696 1697
  /* 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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1698

1699 1700 1701 1702 1703
  /*
    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.
1704
    Don't reset warnings when executing a stored routine.
1705
  */
1706
  if ((all_tables || &lex->select_lex != lex->all_selects_list ||
1707
       lex->sroutines.records) && !thd->spcont)
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1708
    mysql_reset_errors(thd, 0);
1709

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SCRUM  
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1710
#ifdef HAVE_REPLICATION
1711
  if (unlikely(thd->slave_thread))
1712
  {
1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736
    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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1737
    /*
1738 1739
      Check if statment should be skipped because of slave filtering
      rules
1740 1741

      Exceptions are:
1742 1743
      - UPDATE MULTI: For this statement, we want to check the filtering
        rules later in the code
1744
      - SET: we always execute it (Not that many SET commands exists in
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1745 1746
        the binary log anyway -- only 4.1 masters write SET statements,
	in 5.0 there are no SET statements in the binary log)
1747 1748
      - 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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1749
    */
1750 1751
    if (!(lex->sql_command == SQLCOM_UPDATE_MULTI) &&
	!(lex->sql_command == SQLCOM_SET_OPTION) &&
1752
	!(lex->sql_command == SQLCOM_DROP_TABLE &&
1753
          lex->drop_temporary && lex->drop_if_exists) &&
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1754
        all_tables_not_ok(thd, all_tables))
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1755 1756
    {
      /* we warn the slave SQL thread */
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1757
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774
      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);
      }
1775
      DBUG_RETURN(0);
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1776
    }
1777
  }
1778
  else
1779
  {
1780
#endif /* HAVE_REPLICATION */
1781 1782 1783 1784 1785 1786
    /*
      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) &&
1787
	(sql_command_flags[lex->sql_command] & CF_CHANGES_DATA) &&
1788 1789 1790 1791 1792
        !((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)))
1793 1794 1795 1796 1797 1798 1799
    {
      my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only");
      DBUG_RETURN(-1);
    }
#ifdef HAVE_REPLICATION
  } /* endif unlikely slave */
#endif
1800
  status_var_increment(thd->status_var.com_stat[lex->sql_command]);
1801

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1802
  switch (lex->sql_command) {
1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841
  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:
1842
  case SQLCOM_SHOW_STORAGE_ENGINES:
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1843
  case SQLCOM_SELECT:
1844
    thd->status_var.last_query_cost= 0.0;
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1845
    if (all_tables)
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1846
    {
1847 1848 1849 1850
      res= check_table_access(thd,
                              lex->exchange ? SELECT_ACL | FILE_ACL :
                              SELECT_ACL,
                              all_tables, 0);
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1851 1852
    }
    else
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1853
      res= check_access(thd,
1854 1855 1856 1857
                        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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1858
    break;
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1859
  case SQLCOM_PREPARE:
1860
  {
1861
    mysql_sql_stmt_prepare(thd);
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1862 1863 1864 1865
    break;
  }
  case SQLCOM_EXECUTE:
  {
1866
    mysql_sql_stmt_execute(thd);
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1867 1868 1869 1870
    break;
  }
  case SQLCOM_DEALLOCATE_PREPARE:
  {
1871
    mysql_sql_stmt_close(thd);
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1872 1873
    break;
  }
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1874
  case SQLCOM_DO:
1875 1876
    if (check_table_access(thd, SELECT_ACL, all_tables, 0) ||
        open_and_lock_tables(thd, all_tables))
1877
      goto error;
1878 1879

    res= mysql_do(thd, *lex->insert_list);
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1880 1881
    break;

1882
  case SQLCOM_EMPTY_QUERY:
1883
    send_ok(thd);
1884 1885
    break;

1886 1887 1888 1889
  case SQLCOM_HELP:
    res= mysqld_help(thd,lex->help_arg);
    break;

1890
#ifndef EMBEDDED_LIBRARY
1891
  case SQLCOM_PURGE:
1892
  {
1893
    if (check_global_access(thd, SUPER_ACL))
1894
      goto error;
monty@mysql.com's avatar
monty@mysql.com committed
1895
    /* PURGE MASTER LOGS TO 'file' */
1896 1897 1898
    res = purge_master_logs(thd, lex->to_log);
    break;
  }
1899 1900
  case SQLCOM_PURGE_BEFORE:
  {
1901 1902
    Item *it;

1903 1904
    if (check_global_access(thd, SUPER_ACL))
      goto error;
monty@mysql.com's avatar
monty@mysql.com committed
1905
    /* PURGE MASTER LOGS BEFORE 'data' */
1906
    it= (Item *)lex->value_list.head();
1907
    if ((!it->fixed && it->fix_fields(lex->thd, &it)) ||
1908
        it->check_cols(1))
1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919
    {
      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());
1920 1921
    break;
  }
1922
#endif
1923 1924
  case SQLCOM_SHOW_WARNS:
  {
1925 1926
    res= mysqld_show_warnings(thd, (ulong)
			      ((1L << (uint) MYSQL_ERROR::WARN_LEVEL_NOTE) |
1927 1928 1929
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_WARN) |
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR)
			       ));
1930 1931 1932 1933
    break;
  }
  case SQLCOM_SHOW_ERRORS:
  {
1934 1935
    res= mysqld_show_warnings(thd, (ulong)
			      (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR));
1936 1937
    break;
  }
1938 1939
  case SQLCOM_SHOW_NEW_MASTER:
  {
1940
    if (check_global_access(thd, REPL_SLAVE_ACL))
1941
      goto error;
1942
    /* This query don't work now. See comment in repl_failsafe.cc */
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
1943
#ifndef WORKING_NEW_MASTER
1944 1945
    my_error(ER_NOT_SUPPORTED_YET, MYF(0), "SHOW NEW MASTER");
    goto error;
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
1946
#else
1947 1948
    res = show_new_master(thd);
    break;
1949
#endif
1950
  }
1951

1952
#ifdef HAVE_REPLICATION
1953 1954
  case SQLCOM_SHOW_SLAVE_HOSTS:
  {
1955
    if (check_global_access(thd, REPL_SLAVE_ACL))
1956 1957 1958 1959
      goto error;
    res = show_slave_hosts(thd);
    break;
  }
1960 1961
  case SQLCOM_SHOW_BINLOG_EVENTS:
  {
1962
    if (check_global_access(thd, REPL_SLAVE_ACL))
1963
      goto error;
1964
    res = mysql_show_binlog_events(thd);
1965 1966
    break;
  }
1967 1968
#endif

1969
  case SQLCOM_BACKUP_TABLE:
1970
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
1971
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
1972
    if (check_table_access(thd, SELECT_ACL, all_tables, 0) ||
1973
	check_global_access(thd, FILE_ACL))
1974
      goto error; /* purecov: inspected */
1975
    thd->enable_slow_log= opt_log_slow_admin_statements;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
1976
    res = mysql_backup_table(thd, first_table);
1977
    select_lex->table_list.first= (uchar*) first_table;
1978
    lex->query_tables=all_tables;
1979 1980
    break;
  }
1981
  case SQLCOM_RESTORE_TABLE:
1982
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
1983
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
1984
    if (check_table_access(thd, INSERT_ACL, all_tables, 0) ||
1985
	check_global_access(thd, FILE_ACL))
1986
      goto error; /* purecov: inspected */
1987
    thd->enable_slow_log= opt_log_slow_admin_statements;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
1988
    res = mysql_restore_table(thd, first_table);
1989
    select_lex->table_list.first= (uchar*) first_table;
1990
    lex->query_tables=all_tables;
1991 1992
    break;
  }
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
1993 1994
  case SQLCOM_ASSIGN_TO_KEYCACHE:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
1995
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
1996
    if (check_access(thd, INDEX_ACL, first_table->db,
1997 1998
                     &first_table->grant.privilege, 0, 0,
                     test(first_table->schema_table)))
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
1999
      goto error;
2000
    res= mysql_assign_to_keycache(thd, first_table, &lex->ident);
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2001 2002
    break;
  }
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2003 2004
  case SQLCOM_PRELOAD_KEYS:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2005
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2006
    if (check_access(thd, INDEX_ACL, first_table->db,
2007 2008
                     &first_table->grant.privilege, 0, 0,
                     test(first_table->schema_table)))
2009
      goto error;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2010
    res = mysql_preload_keys(thd, first_table);
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2011 2012
    break;
  }
2013
#ifdef HAVE_REPLICATION
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2014
  case SQLCOM_CHANGE_MASTER:
2015
  {
2016
    if (check_global_access(thd, SUPER_ACL))
2017
      goto error;
2018
    pthread_mutex_lock(&LOCK_active_mi);
2019
    res = change_master(thd,active_mi);
2020
    pthread_mutex_unlock(&LOCK_active_mi);
2021 2022
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2023
  case SQLCOM_SHOW_SLAVE_STAT:
2024
  {
2025 2026
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2027
      goto error;
2028
    pthread_mutex_lock(&LOCK_active_mi);
2029
    res = show_master_info(thd,active_mi);
2030
    pthread_mutex_unlock(&LOCK_active_mi);
2031 2032
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2033
  case SQLCOM_SHOW_MASTER_STAT:
2034
  {
2035 2036
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2037 2038 2039 2040
      goto error;
    res = show_binlog_info(thd);
    break;
  }
peter@mysql.com's avatar
peter@mysql.com committed
2041

2042
  case SQLCOM_LOAD_MASTER_DATA: // sync with master
2043
    if (check_global_access(thd, SUPER_ACL))
2044
      goto error;
2045
    if (end_active_trans(thd))
2046
      goto error;
2047
    res = load_master_data(thd);
2048
    break;
2049
#endif /* HAVE_REPLICATION */
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
2050
  case SQLCOM_SHOW_ENGINE_STATUS:
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2051
    {
2052
      if (check_global_access(thd, SUPER_ACL))
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
2053 2054
        goto error;
      res = ha_show_status(thd, lex->create_info.db_type, HA_ENGINE_STATUS);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2055 2056
      break;
    }
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
2057
  case SQLCOM_SHOW_ENGINE_MUTEX:
vtkachenko@intelp4d.mysql.com's avatar
vtkachenko@intelp4d.mysql.com committed
2058 2059
    {
      if (check_global_access(thd, SUPER_ACL))
vtkachenko@intelp4d.mysql.com's avatar
vtkachenko@intelp4d.mysql.com committed
2060
        goto error;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
2061
      res = ha_show_status(thd, lex->create_info.db_type, HA_ENGINE_MUTEX);
vtkachenko@intelp4d.mysql.com's avatar
vtkachenko@intelp4d.mysql.com committed
2062 2063
      break;
    }
2064
#ifdef HAVE_REPLICATION
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2065
  case SQLCOM_LOAD_MASTER_TABLE:
2066
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2067
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2068 2069
    DBUG_ASSERT(first_table->db); /* Must be set in the parser */

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2070
    if (check_access(thd, CREATE_ACL, first_table->db,
2071 2072
		     &first_table->grant.privilege, 0, 0,
                     test(first_table->schema_table)))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2073
      goto error;				/* purecov: inspected */
2074 2075 2076 2077
    /* Check that the first table has CREATE privilege */
    if (check_grant(thd, CREATE_ACL, all_tables, 0, 1, 0))
      goto error;

2078
    pthread_mutex_lock(&LOCK_active_mi);
2079 2080 2081 2082
    /*
      fetch_master_table will send the error to the client on failure.
      Give error if the table already exists.
    */
2083
    if (!fetch_master_table(thd, first_table->db, first_table->table_name,
2084
			    active_mi, 0, 0))
2085
    {
2086
      send_ok(thd);
2087
    }
2088
    pthread_mutex_unlock(&LOCK_active_mi);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2089
    break;
2090
  }
2091
#endif /* HAVE_REPLICATION */
2092

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2093
  case SQLCOM_CREATE_TABLE:
2094
  {
2095
    /* If CREATE TABLE of non-temporary table, do implicit commit */
2096 2097 2098 2099 2100 2101 2102 2103
    if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE))
    {
      if (end_active_trans(thd))
      {
	res= -1;
	break;
      }
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2104 2105 2106 2107 2108
    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;
2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129
    /*
      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;
    }
monty@mysql.com's avatar
monty@mysql.com committed
2130

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2131
    if ((res= create_table_precheck(thd, select_tables, create_table)))
monty@mysql.com's avatar
monty@mysql.com committed
2132
      goto end_with_restore_list;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2133

2134 2135 2136
    /* Might have been updated in create_table_precheck */
    create_info.alias= create_table->alias;

2137
#ifndef HAVE_READLINK
2138
    if (create_info.data_file_name)
2139 2140
      push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
                   "DATA DIRECTORY option ignored");
2141
    if (create_info.index_file_name)
2142 2143
      push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
                   "INDEX DIRECTORY option ignored");
2144
    create_info.data_file_name= create_info.index_file_name= NULL;
2145
#else
2146
    /* Fix names if symlinked tables */
2147
    if (append_file_to_dir(thd, &create_info.data_file_name,
2148
			   create_table->table_name) ||
2149
	append_file_to_dir(thd, &create_info.index_file_name,
2150
			   create_table->table_name))
monty@mysql.com's avatar
monty@mysql.com committed
2151
      goto end_with_restore_list;
2152
#endif
2153
    /*
2154
      If we are using SET CHARSET without DEFAULT, add an implicit
2155 2156
      DEFAULT to not confuse old users. (This may change).
    */
2157
    if ((create_info.used_fields &
2158 2159 2160
	 (HA_CREATE_USED_DEFAULT_CHARSET | HA_CREATE_USED_CHARSET)) ==
	HA_CREATE_USED_CHARSET)
    {
2161 2162 2163 2164
      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;
2165
    }
2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178
    /*
      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.
    */
2179 2180
    if (!thd->locked_tables &&
        !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
2181
    {
monty@mysql.com's avatar
monty@mysql.com committed
2182 2183
      res= 1;
      goto end_with_restore_list;
2184
    }
2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195
#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
2196
    if (select_lex->item_list.elements)		// With select
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2197 2198
    {
      select_result *result;
2199

2200
      select_lex->options|= SELECT_NO_UNLOCK;
2201
      unit->set_limit(select_lex);
2202

2203
      if (!(create_info.options & HA_LEX_CREATE_TMP_TABLE))
dlenev@mockturtle.local's avatar
dlenev@mockturtle.local committed
2204 2205 2206 2207 2208 2209
      {
        lex->link_first_table_back(create_table, link_to_local);
        create_table->create= TRUE;
      }

      if (!(res= open_and_lock_tables(thd, lex->query_tables)))
2210
      {
2211 2212 2213 2214
        /*
          Is table which we are changing used somewhere in other parts
          of query
        */
2215
        if (!(create_info.options & HA_LEX_CREATE_TMP_TABLE))
2216
        {
2217
          TABLE_LIST *duplicate;
dlenev@mockturtle.local's avatar
dlenev@mockturtle.local committed
2218
          create_table= lex->unlink_first_table(&link_to_local);
2219
          if ((duplicate= unique_table(thd, create_table, select_tables, 0)))
2220 2221 2222
          {
            update_non_unique_table_error(create_table, "CREATE", duplicate);
            res= 1;
2223
            goto end_with_restore_list;
2224
          }
2225
        }
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2226
        /* If we create merge table, we have to test tables in merge, too */
2227
        if (create_info.used_fields & HA_CREATE_USED_UNION)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2228 2229
        {
          TABLE_LIST *tab;
2230
          for (tab= (TABLE_LIST*) create_info.merge_list.first;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2231 2232 2233
               tab;
               tab= tab->next_local)
          {
2234
            TABLE_LIST *duplicate;
2235
            if ((duplicate= unique_table(thd, tab, select_tables, 0)))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2236
            {
2237
              update_non_unique_table_error(tab, "CREATE", duplicate);
monty@mysql.com's avatar
monty@mysql.com committed
2238
              res= 1;
2239
              goto end_with_restore_list;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2240 2241 2242
            }
          }
        }
2243

dlenev@mockturtle.local's avatar
dlenev@mockturtle.local committed
2244
        /*
2245 2246
          select_create is currently not re-execution friendly and
          needs to be created for every execution of a PS/SP.
dlenev@mockturtle.local's avatar
dlenev@mockturtle.local committed
2247
        */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2248
        if ((result= new select_create(create_table,
2249 2250 2251 2252
                                       &create_info,
                                       &alter_info,
                                       select_lex->item_list,
                                       lex->duplicates,
2253
                                       lex->ignore,
2254
                                       select_tables)))
2255 2256 2257 2258 2259
        {
          /*
            CREATE from SELECT give its SELECT_LEX for SELECT,
            and item_list belong to SELECT
          */
2260
          res= handle_select(thd, lex, result, 0);
2261
          delete result;
2262
        }
2263
      }
2264
      else if (!(create_info.options & HA_LEX_CREATE_TMP_TABLE))
dlenev@mockturtle.local's avatar
dlenev@mockturtle.local committed
2265 2266
        create_table= lex->unlink_first_table(&link_to_local);

2267
    }
monty@mysql.com's avatar
monty@mysql.com committed
2268
    else
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2269
    {
2270
      /* So that CREATE TEMPORARY TABLE gets to binlog at commit/rollback */
2271
      if (create_info.options & HA_LEX_CREATE_TMP_TABLE)
2272
        thd->options|= OPTION_KEEP_LOG;
monty@mysql.com's avatar
monty@mysql.com committed
2273
      /* regular create */
2274
      if (create_info.options & HA_LEX_CREATE_TABLE_LIKE)
2275
        res= mysql_create_like_table(thd, create_table, select_tables,
2276
                                     &create_info);
venu@myvenu.com's avatar
venu@myvenu.com committed
2277
      else
2278
      {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2279
        res= mysql_create_table(thd, create_table->db,
2280 2281
                                create_table->table_name, &create_info,
                                &alter_info, 0, 0);
2282
      }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2283
      if (!res)
2284
	send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2285
    }
2286

monty@mysql.com's avatar
monty@mysql.com committed
2287
    /* put tables back for PS rexecuting */
monty@mysql.com's avatar
monty@mysql.com committed
2288
end_with_restore_list:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2289
    lex->link_first_table_back(create_table, link_to_local);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2290
    break;
2291
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2292
  case SQLCOM_CREATE_INDEX:
2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310
    /* 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;

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2311 2312
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_one_table_access(thd, INDEX_ACL, all_tables))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2313
      goto error; /* purecov: inspected */
2314
    if (end_active_trans(thd))
2315
      goto error;
2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326
    /*
      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;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2327

2328 2329 2330 2331 2332
    res= mysql_alter_table(thd, first_table->db, first_table->table_name,
                           &create_info, first_table, &alter_info,
                           0, (ORDER*) 0, 0);
    break;
  }
2333
#ifdef HAVE_REPLICATION
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2334
  case SQLCOM_SLAVE_START:
2335
  {
2336
    pthread_mutex_lock(&LOCK_active_mi);
2337
    start_slave(thd,active_mi,1 /* net report*/);
2338
    pthread_mutex_unlock(&LOCK_active_mi);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2339
    break;
2340
  }
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bk@work.mysql.com committed
2341
  case SQLCOM_SLAVE_STOP:
2342 2343 2344 2345 2346 2347
  /*
    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,
2348
      so it waits for the client thread because t is locked by it.
2349
    - then the client thread does SLAVE STOP.
2350 2351
      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.
2352 2353 2354
    To prevent that, refuse SLAVE STOP if the
    client thread has locked tables
  */
2355
  if (thd->locked_tables || thd->active_transaction() || thd->global_read_lock)
2356
  {
2357 2358
    my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
               ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
2359
    goto error;
2360
  }
2361
  {
2362
    pthread_mutex_lock(&LOCK_active_mi);
2363
    stop_slave(thd,active_mi,1/* net report*/);
2364
    pthread_mutex_unlock(&LOCK_active_mi);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2365
    break;
2366
  }
2367
#endif /* HAVE_REPLICATION */
2368

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2369
  case SQLCOM_ALTER_TABLE:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2370
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2371
    {
2372
      ulong priv=0;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
2373
      ulong priv_needed= ALTER_ACL;
2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384
      /*
        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;
2385 2386 2387 2388
      /*
        We also require DROP priv for ALTER TABLE ... DROP PARTITION, as well
        as for RENAME TO, as being done by SQLCOM_RENAME_TABLE
      */
2389
      if (alter_info.flags & (ALTER_DROP_PARTITION | ALTER_RENAME))
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
2390 2391
        priv_needed|= DROP_ACL;

2392 2393
      /* Must be set in the parser */
      DBUG_ASSERT(select_lex->db);
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
2394
      if (check_access(thd, priv_needed, first_table->db,
2395 2396 2397 2398
		       &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))||
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VIEW  
bell@sanja.is.com.ua committed
2399
	  check_merge_table_access(thd, first_table->db,
2400
				   (TABLE_LIST *)
2401
				   create_info.merge_list.first))
2402
	goto error;				/* purecov: inspected */
2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414
      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;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2415
      }
2416

2417
      /* Don't yet allow changing of symlinks with ALTER TABLE */
2418
      if (create_info.data_file_name)
2419 2420
        push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
                     "DATA DIRECTORY option ignored");
2421
      if (create_info.index_file_name)
2422 2423
        push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0,
                     "INDEX DIRECTORY option ignored");
2424
      create_info.data_file_name= create_info.index_file_name= NULL;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2425
      /* ALTER TABLE ends previous transaction */
2426
      if (end_active_trans(thd))
2427
	goto error;
2428

2429 2430 2431 2432 2433
      if (!thd->locked_tables &&
          !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
      {
        res= 1;
        break;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2434
      }
2435

2436
      thd->enable_slow_log= opt_log_slow_admin_statements;
2437
      res= mysql_alter_table(thd, select_lex->db, lex->name.str,
2438 2439 2440
                             &create_info,
                             first_table,
                             &alter_info,
2441 2442
                             select_lex->order_list.elements,
                             (ORDER *) select_lex->order_list.first,
2443
                             lex->ignore);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2444 2445
      break;
    }
2446
  case SQLCOM_RENAME_TABLE:
2447
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2448
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2449
    TABLE_LIST *table;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2450
    for (table= first_table; table; table= table->next_local->next_local)
2451
    {
monty@donna.mysql.com's avatar
monty@donna.mysql.com committed
2452
      if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
2453
		       &table->grant.privilege,0,0, test(table->schema_table)) ||
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2454
	  check_access(thd, INSERT_ACL | CREATE_ACL, table->next_local->db,
2455 2456
		       &table->next_local->grant.privilege, 0, 0,
                       test(table->next_local->schema_table)))
2457
	goto error;
2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469
      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;
2470
    }
2471

cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
2472
    if (end_active_trans(thd) || mysql_rename_tables(thd, first_table, 0))
2473
      goto error;
2474
    break;
2475
  }
2476
#ifndef EMBEDDED_LIBRARY
2477 2478
  case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2479 2480
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
2481
    goto error;
2482 2483
#else
    {
2484
      if (check_global_access(thd, SUPER_ACL))
2485 2486 2487 2488
	goto error;
      res = show_binlogs(thd);
      break;
    }
peter@mysql.com's avatar
peter@mysql.com committed
2489
#endif
2490
#endif /* EMBEDDED_LIBRARY */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2491
  case SQLCOM_SHOW_CREATE:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2492
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2493
#ifdef DONT_ALLOW_SHOW_COMMANDS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2494 2495
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
2496
    goto error;
2497
#else
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2498
    {
2499 2500 2501
      /* Ignore temporary tables if this is "SHOW CREATE VIEW" */
      if (lex->only_view)
        first_table->skip_temporary= 1;
2502
      if (check_show_create_table_access(thd, first_table))
2503
	goto error;
monty@mishka.local's avatar
monty@mishka.local committed
2504
      res= mysqld_show_create(thd, first_table);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2505 2506
      break;
    }
2507
#endif
2508 2509
  case SQLCOM_CHECKSUM:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2510
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2511
    if (check_table_access(thd, SELECT_ACL | EXTRA_ACL, all_tables, 0))
2512
      goto error; /* purecov: inspected */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2513
    res = mysql_checksum_table(thd, first_table, &lex->check_opt);
2514 2515
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2516
  case SQLCOM_REPAIR:
2517
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2518
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2519
    if (check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
2520
      goto error; /* purecov: inspected */
2521
    thd->enable_slow_log= opt_log_slow_admin_statements;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2522
    res= mysql_repair_table(thd, first_table, &lex->check_opt);
2523 2524 2525
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
2526 2527 2528
      /*
        Presumably, REPAIR and binlog writing doesn't require synchronization
      */
2529
      write_bin_log(thd, TRUE, thd->query, thd->query_length);
2530
    }
2531
    select_lex->table_list.first= (uchar*) first_table;
2532
    lex->query_tables=all_tables;
2533 2534
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2535
  case SQLCOM_CHECK:
2536
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2537
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2538
    if (check_table_access(thd, SELECT_ACL | EXTRA_ACL , all_tables, 0))
2539
      goto error; /* purecov: inspected */
2540
    thd->enable_slow_log= opt_log_slow_admin_statements;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2541
    res = mysql_check_table(thd, first_table, &lex->check_opt);
2542
    select_lex->table_list.first= (uchar*) first_table;
2543
    lex->query_tables=all_tables;
2544 2545
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2546 2547
  case SQLCOM_ANALYZE:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2548
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2549
    if (check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2550
      goto error; /* purecov: inspected */
2551
    thd->enable_slow_log= opt_log_slow_admin_statements;
2552
    res= mysql_analyze_table(thd, first_table, &lex->check_opt);
2553 2554 2555
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
2556 2557 2558
      /*
        Presumably, ANALYZE and binlog writing doesn't require synchronization
      */
2559
      write_bin_log(thd, TRUE, thd->query, thd->query_length);
2560
    }
2561
    select_lex->table_list.first= (uchar*) first_table;
2562
    lex->query_tables=all_tables;
2563
    break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2564
  }
2565

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2566 2567
  case SQLCOM_OPTIMIZE:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2568
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2569
    if (check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2570
      goto error; /* purecov: inspected */
2571
    thd->enable_slow_log= opt_log_slow_admin_statements;
2572
    res= (specialflag & (SPECIAL_SAFE_MODE | SPECIAL_NO_NEW_FUNC)) ?
2573
      mysql_recreate_table(thd, first_table) :
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2574
      mysql_optimize_table(thd, first_table, &lex->check_opt);
2575 2576 2577
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
2578 2579 2580
      /*
        Presumably, OPTIMIZE and binlog writing doesn't require synchronization
      */
2581
      write_bin_log(thd, TRUE, thd->query, thd->query_length);
2582
    }
2583
    select_lex->table_list.first= (uchar*) first_table;
2584
    lex->query_tables=all_tables;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2585 2586 2587
    break;
  }
  case SQLCOM_UPDATE:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2588 2589
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (update_precheck(thd, all_tables))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2590
      break;
2591 2592
    DBUG_ASSERT(select_lex->offset_limit == 0);
    unit->set_limit(select_lex);
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
2593 2594 2595 2596 2597 2598 2599 2600
    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));
2601
    /* mysql_update return 2 if we need to switch to multi-update */
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
2602
    if (up_result != 2)
2603
      break;
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
2604
    /* Fall through */
2605
  case SQLCOM_UPDATE_MULTI:
2606 2607 2608
  {
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    /* if we switched from normal update, rights are checked */
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
2609
    if (up_result != 2)
2610
    {
2611 2612 2613 2614 2615
      if ((res= multi_update_precheck(thd, all_tables)))
        break;
    }
    else
      res= 0;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2616

2617
    res= mysql_multi_update_prepare(thd);
2618

2619
#ifdef HAVE_REPLICATION
2620
    /* Check slave filtering rules */
2621
    if (unlikely(thd->slave_thread))
2622
    {
2623 2624
      if (all_tables_not_ok(thd, all_tables))
      {
2625 2626 2627 2628 2629
        if (res!= 0)
        {
          res= 0;             /* don't care of prev failure  */
          thd->clear_error(); /* filters are of highest prior */
        }
2630 2631 2632 2633
        /* we warn the slave SQL thread */
        my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
        break;
      }
2634 2635
      if (res)
        break;
2636
    }
2637 2638
    else
    {
2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651
#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
2652

2653 2654 2655 2656 2657 2658
    res= mysql_multi_update(thd, all_tables,
                            &select_lex->item_list,
                            &lex->value_list,
                            select_lex->where,
                            select_lex->options,
                            lex->duplicates, lex->ignore, unit, select_lex);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2659
    break;
monty@mysql.com's avatar
monty@mysql.com committed
2660
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2661
  case SQLCOM_REPLACE:
2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691
#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
2692 2693
  case SQLCOM_INSERT:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2694
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
monty@mysql.com's avatar
monty@mysql.com committed
2695
    if ((res= insert_precheck(thd, all_tables)))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2696
      break;
2697 2698 2699 2700 2701 2702 2703 2704

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

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2705
    res= mysql_insert(thd, all_tables, lex->field_list, lex->many_values,
monty@mishka.local's avatar
monty@mishka.local committed
2706
		      lex->update_list, lex->value_list,
2707
                      lex->duplicates, lex->ignore);
2708 2709 2710 2711 2712 2713 2714

    /*
      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.
    */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2715
    if (first_table->view && !first_table->contain_auto_increment)
2716 2717
      thd->first_successful_insert_id_in_cur_stmt=
        thd->first_successful_insert_id_in_prev_stmt;
2718

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2719
    break;
2720
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2721 2722 2723
  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
  {
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
2724
    select_result *sel_result;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2725
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
monty@mishka.local's avatar
monty@mishka.local committed
2726
    if ((res= insert_precheck(thd, all_tables)))
2727
      break;
monty@mysql.com's avatar
monty@mysql.com committed
2728

2729
    /* Fix lock for first table */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2730 2731
    if (first_table->lock_type == TL_WRITE_DELAYED)
      first_table->lock_type= TL_WRITE;
2732

2733 2734
    /* Don't unlock tables until command is written to binary log */
    select_lex->options|= SELECT_NO_UNLOCK;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2735

2736
    unit->set_limit(select_lex);
2737 2738 2739 2740 2741 2742 2743 2744

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

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2745
    if (!(res= open_and_lock_tables(thd, all_tables)))
2746
    {
2747
      /* Skip first table, which is the table we are inserting in */
2748
      TABLE_LIST *second_table= first_table->next_local;
2749
      select_lex->table_list.first= (uchar*) second_table;
2750 2751
      select_lex->context.table_list= 
        select_lex->context.first_name_resolution_table= second_table;
2752
      res= mysql_insert_select_prepare(thd);
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
2753 2754 2755 2756 2757 2758 2759
      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)))
2760
      {
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
2761
	res= handle_select(thd, lex, sel_result, OPTION_SETUP_TABLES_DONE);
2762 2763 2764 2765 2766 2767 2768 2769 2770
        /*
          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)
        {
2771 2772 2773
          /* INSERT ... SELECT should invalidate only the very first table */
          TABLE_LIST *save_table= first_table->next_local;
          first_table->next_local= 0;
2774 2775
          mysql_unlock_tables(thd, thd->lock);
          query_cache_invalidate3(thd, first_table, 1);
2776
          first_table->next_local= save_table;
2777 2778
          thd->lock=0;
        }
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
2779
        delete sel_result;
2780
      }
2781
      /* revert changes for SP */
2782
      select_lex->table_list.first= (uchar*) first_table;
2783
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2784

2785 2786 2787 2788 2789 2790
    /*
      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.
    */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2791
    if (first_table->view && !first_table->contain_auto_increment)
2792 2793
      thd->first_successful_insert_id_in_cur_stmt=
        thd->first_successful_insert_id_in_prev_stmt;
2794

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2795 2796
    break;
  }
2797
  case SQLCOM_TRUNCATE:
2798 2799 2800 2801 2802
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2803
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
2804
    if (check_one_table_access(thd, DROP_ACL, all_tables))
2805
      goto error;
2806 2807 2808 2809
    /*
      Don't allow this within a transaction because we want to use
      re-generate table
    */
2810
    if (thd->locked_tables || thd->active_transaction())
2811
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2812 2813
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
2814 2815
      goto error;
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2816

monty@mysql.com's avatar
monty@mysql.com committed
2817
    res= mysql_truncate(thd, first_table, 0);
2818
    break;
2819
  case SQLCOM_DELETE:
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2820
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2821 2822
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if ((res= delete_precheck(thd, all_tables)))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2823
      break;
2824 2825
    DBUG_ASSERT(select_lex->offset_limit == 0);
    unit->set_limit(select_lex);
2826 2827 2828 2829 2830 2831 2832 2833

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

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2834
    res = mysql_delete(thd, all_tables, select_lex->where,
2835
                       &select_lex->order_list,
osku@127.(none)'s avatar
osku@127.(none) committed
2836 2837
                       unit->select_limit_cnt, select_lex->options,
                       FALSE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2838 2839
    break;
  }
2840
  case SQLCOM_DELETE_MULTI:
2841
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2842
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2843
    TABLE_LIST *aux_tables=
2844
      (TABLE_LIST *)thd->lex->auxiliary_table_list.first;
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
2845
    multi_delete *del_result;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2846

2847 2848 2849 2850 2851 2852 2853
    if (!thd->locked_tables &&
        !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1)))
    {
      res= 1;
      break;
    }

2854
    if ((res= multi_delete_precheck(thd, all_tables)))
2855
      break;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2856

2857
    /* condition will be TRUE on SP re-excuting */
2858 2859
    if (select_lex->item_list.elements != 0)
      select_lex->item_list.empty();
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2860
    if (add_item_to_list(thd, new Item_null()))
2861
      goto error;
2862

2863
    thd->proc_info="init";
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2864 2865 2866 2867
    if ((res= open_and_lock_tables(thd, all_tables)))
      break;

    if ((res= mysql_multi_delete_prepare(thd)))
2868
      goto error;
2869

malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
2870 2871
    if (!thd->is_fatal_error &&
        (del_result= new multi_delete(aux_tables, lex->table_count)))
2872
    {
2873 2874 2875
      res= mysql_select(thd, &select_lex->ref_pointer_array,
			select_lex->get_table_list(),
			select_lex->with_wild,
2876
			select_lex->item_list,
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2877
			select_lex->where,
2878
			0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2879 2880
			(ORDER *)NULL,
			select_lex->options | thd->options |
2881 2882
			SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK |
                        OPTION_SETUP_TABLES_DONE,
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
2883 2884
			del_result, unit, select_lex);
      delete del_result;
2885 2886
    }
    else
2887
      res= TRUE;                                // Error
2888 2889
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2890
  case SQLCOM_DROP_TABLE:
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
2891
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2892
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
2893 2894
    if (!lex->drop_temporary)
    {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2895
      if (check_table_access(thd, DROP_ACL, all_tables, 0))
2896 2897
	goto error;				/* purecov: inspected */
      if (end_active_trans(thd))
2898
        goto error;
2899
    }
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
2900
    else
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
2901 2902 2903 2904 2905 2906
    {
      /*
	If this is a slave thread, we may sometimes execute some 
	DROP / * 40005 TEMPORARY * / TABLE
	that come from parts of binlogs (likely if we use RESET SLAVE or CHANGE
	MASTER TO), while the temporary table has already been dropped.
monty@mysql.com's avatar
monty@mysql.com committed
2907 2908
	To not generate such irrelevant "table does not exist errors",
	we silently add IF EXISTS if TEMPORARY was used.
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
2909 2910
      */
      if (thd->slave_thread)
2911
        lex->drop_if_exists= 1;
2912

2913
      /* So that DROP TEMPORARY TABLE gets to binlog at commit/rollback */
2914
      thd->options|= OPTION_KEEP_LOG;
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
2915
    }
2916
    /* DDL and binlog write order protected by LOCK_open */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2917 2918
    res= mysql_rm_table(thd, first_table, lex->drop_if_exists,
			lex->drop_temporary);
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
2919 2920
  }
  break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2921
  case SQLCOM_SHOW_PROCESSLIST:
2922 2923
    if (!thd->security_ctx->priv_user[0] &&
        check_global_access(thd,PROCESS_ACL))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2924
      break;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2925
    mysqld_list_processes(thd,
2926 2927 2928 2929
			  (thd->security_ctx->master_access & PROCESS_ACL ?
                           NullS :
                           thd->security_ctx->priv_user),
                          lex->verbose);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2930
    break;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
2931 2932 2933
  case SQLCOM_SHOW_AUTHORS:
    res= mysqld_show_authors(thd);
    break;
2934 2935 2936
  case SQLCOM_SHOW_CONTRIBUTORS:
    res= mysqld_show_contributors(thd);
    break;
2937 2938 2939 2940 2941 2942
  case SQLCOM_SHOW_PRIVILEGES:
    res= mysqld_show_privileges(thd);
    break;
  case SQLCOM_SHOW_COLUMN_TYPES:
    res= mysqld_show_column_types(thd);
    break;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
2943
  case SQLCOM_SHOW_ENGINE_LOGS:
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
2944
#ifdef DONT_ALLOW_SHOW_COMMANDS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2945 2946
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0));	/* purecov: inspected */
2947
    goto error;
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
2948 2949
#else
    {
2950
      if (check_access(thd, FILE_ACL, any_db,0,0,0,0))
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
2951
	goto error;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
2952
      res= ha_show_status(thd, lex->create_info.db_type, HA_ENGINE_LOGS);
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
2953 2954
      break;
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2955 2956
#endif
  case SQLCOM_CHANGE_DB:
2957 2958 2959 2960
  {
    LEX_STRING db_str= { (char *) select_lex->db, strlen(select_lex->db) };

    if (!mysql_change_db(thd, &db_str, FALSE))
2961
      send_ok(thd);
2962

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2963
    break;
2964
  }
2965

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2966 2967
  case SQLCOM_LOAD:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2968
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2969
    uint privilege= (lex->duplicates == DUP_REPLACE ?
2970 2971
		     INSERT_ACL | DELETE_ACL : INSERT_ACL) |
                    (lex->local_file ? 0 : FILE_ACL);
2972

2973
    if (lex->local_file)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2974
    {
2975
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
2976
          !opt_local_infile)
2977
      {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2978
	my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND), MYF(0));
2979 2980
	goto error;
      }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2981
    }
2982 2983 2984 2985

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

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2986
    res= mysql_load(thd, lex->exchange, first_table, lex->field_list,
2987
                    lex->update_list, lex->value_list, lex->duplicates,
2988
                    lex->ignore, (bool) lex->local_file);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2989 2990
    break;
  }
2991

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2992
  case SQLCOM_SET_OPTION:
2993 2994
  {
    List<set_var_base> *lex_var_list= &lex->var_list;
2995
    if ((check_table_access(thd, SELECT_ACL, all_tables, 0) ||
2996 2997
	 open_and_lock_tables(thd, all_tables)))
      goto error;
2998 2999
    if (lex->one_shot_set && not_all_support_one_shot(lex_var_list))
    {
3000 3001
      my_error(ER_RESERVED_SYNTAX, MYF(0), "SET ONE_SHOT");
      goto error;
3002 3003 3004 3005 3006 3007 3008 3009
    }
    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;
3010
      send_ok(thd);
3011
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3012
    break;
3013
  }
3014

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3015
  case SQLCOM_UNLOCK_TABLES:
3016 3017 3018 3019 3020 3021
    /*
      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.
    */
3022
    unlock_locked_tables(thd);
3023 3024
    if (thd->options & OPTION_TABLE_LOCK)
    {
3025
      end_active_trans(thd);
3026
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3027 3028
    }
    if (thd->global_read_lock)
3029
      unlock_global_read_lock(thd);
3030
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3031 3032
    break;
  case SQLCOM_LOCK_TABLES:
3033
    unlock_locked_tables(thd);
3034
    /* we must end the trasaction first, regardless of anything */
3035
    if (end_active_trans(thd))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3036
      goto error;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3037
    if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, all_tables, 0))
3038
      goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3039
    thd->in_lock_tables=1;
3040
    thd->options|= OPTION_TABLE_LOCK;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3041

3042
    if (!(res= simple_open_n_lock_tables(thd, all_tables)))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3043
    {
3044 3045
#ifdef HAVE_QUERY_CACHE
      if (thd->variables.query_cache_wlock_invalidate)
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3046
	query_cache.invalidate_locked_for_write(first_table);
3047
#endif /*HAVE_QUERY_CACHE*/
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3048 3049
      thd->locked_tables=thd->lock;
      thd->lock=0;
3050
      send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3051
    }
3052
    else
3053 3054 3055 3056 3057 3058 3059
    {
      /* 
        Need to end the current transaction, so the storage engine (InnoDB)
        can free its locks if LOCK TABLES locked some tables before finding
        that it can't lock a table in its list
      */
      end_active_trans(thd);
3060
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
3061
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3062 3063 3064
    thd->in_lock_tables=0;
    break;
  case SQLCOM_CREATE_DB:
3065
  {
3066 3067 3068 3069 3070 3071
    /*
      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);
3072 3073 3074 3075 3076
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
3077
    char *alias;
3078 3079
    if (!(alias=thd->strmake(lex->name.str, lex->name.length)) ||
        check_db_name(&lex->name))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3080
    {
3081
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name.str);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3082 3083
      break;
    }
3084 3085 3086
    /*
      If in a slave thread :
      CREATE DATABASE DB was certainly not preceded by USE DB.
3087
      For that reason, db_ok() in sql/slave.cc did not check the
3088 3089 3090
      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.
    */
3091
#ifdef HAVE_REPLICATION
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3092
    if (thd->slave_thread && 
3093 3094
	(!rpl_filter->db_ok(lex->name.str) ||
	 !rpl_filter->db_ok_with_wild_table(lex->name.str)))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3095
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3096
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
3097
      break;
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3098
    }
3099
#endif
3100 3101
    if (check_access(thd,CREATE_ACL,lex->name.str, 0, 1, 0,
                     is_schema_db(lex->name.str)))
3102
      break;
3103
    res= mysql_create_db(thd,(lower_case_table_names == 2 ? alias :
3104
                              lex->name.str), &create_info, 0);
3105 3106
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3107
  case SQLCOM_DROP_DB:
3108
  {
3109 3110 3111 3112 3113
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
3114
    if (check_db_name(&lex->name))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3115
    {
3116
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name.str);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3117 3118
      break;
    }
3119 3120 3121 3122 3123 3124 3125
    /*
      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.
    */
3126
#ifdef HAVE_REPLICATION
3127
    if (thd->slave_thread && 
3128 3129
	(!rpl_filter->db_ok(lex->name.str) ||
	 !rpl_filter->db_ok_with_wild_table(lex->name.str)))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3130
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3131
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
3132
      break;
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3133
    }
3134
#endif
3135 3136
    if (check_access(thd,DROP_ACL,lex->name.str,0,1,0,
                     is_schema_db(lex->name.str)))
3137
      break;
3138 3139
    if (thd->locked_tables || thd->active_transaction())
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3140 3141
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3142 3143
      goto error;
    }
3144
    res= mysql_rm_db(thd, lex->name.str, lex->drop_if_exists, 0);
3145 3146
    break;
  }
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169
  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
3170 3171 3172 3173 3174
    if (check_db_name(newdb))
    {
      my_error(ER_WRONG_DB_NAME, MYF(0), newdb->str);
      break;
    }
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193
    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;
  }
3194 3195
  case SQLCOM_ALTER_DB:
  {
3196
    LEX_STRING *db= &lex->name;
3197
    HA_CREATE_INFO create_info(lex->create_info);
3198
    if (check_db_name(db))
3199
    {
3200
      my_error(ER_WRONG_DB_NAME, MYF(0), db->str);
3201 3202
      break;
    }
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3203 3204 3205
    /*
      If in a slave thread :
      ALTER DATABASE DB may not be preceded by USE DB.
3206
      For that reason, maybe db_ok() in sql/slave.cc did not check the
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3207 3208 3209 3210
      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
3211
    if (thd->slave_thread &&
3212 3213
	(!rpl_filter->db_ok(db->str) ||
	 !rpl_filter->db_ok_with_wild_table(db->str)))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3214
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3215
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3216 3217 3218
      break;
    }
#endif
3219
    if (check_access(thd, ALTER_ACL, db->str, 0, 1, 0, is_schema_db(db->str)))
3220 3221 3222
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3223 3224
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3225 3226
      goto error;
    }
3227
    res= mysql_alter_db(thd, db->str, &create_info);
3228 3229
    break;
  }
3230 3231
  case SQLCOM_SHOW_CREATE_DB:
  {
3232
    if (check_db_name(&lex->name))
3233
    {
3234
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name.str);
3235 3236
      break;
    }
3237
    res= mysqld_show_create_db(thd, lex->name.str, &lex->create_info);
3238 3239
    break;
  }
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cmiller@zippy.(none) committed
3240 3241
  case SQLCOM_CREATE_EVENT:
  case SQLCOM_ALTER_EVENT:
3242
  do
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3243
  {
3244
    DBUG_ASSERT(lex->event_parse_data);
3245 3246 3247 3248 3249 3250
    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;
    }
3251 3252 3253 3254 3255

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

3256 3257
    switch (lex->sql_command) {
    case SQLCOM_CREATE_EVENT:
3258 3259 3260 3261
    {
      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);
3262
      break;
3263
    }
3264
    case SQLCOM_ALTER_EVENT:
3265 3266 3267
      res= Events::update_event(thd, lex->event_parse_data,
                                lex->spname ? &lex->spname->m_db : NULL,
                                lex->spname ? &lex->spname->m_name : NULL);
3268
      break;
3269 3270
    default:
      DBUG_ASSERT(0);
3271
    }
3272
    DBUG_PRINT("info",("DDL error code=%d", res));
3273
    if (!res)
3274
      send_ok(thd);
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cmiller@zippy.(none) committed
3275

3276 3277 3278 3279 3280 3281
  } while (0);
  /* Don't do it, if we are inside a SP */
  if (!thd->spcont)
  {
    delete lex->sphead;
    lex->sphead= NULL;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3282
  }
3283 3284
  /* lex->unit.cleanup() is called outside, no need to call it here */
  break;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3285
  case SQLCOM_SHOW_CREATE_EVENT:
3286 3287 3288 3289 3290 3291 3292 3293
    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);
3294
    break;
monty@mysql.com's avatar
monty@mysql.com committed
3295
  case SQLCOM_CREATE_FUNCTION:                  // UDF function
monty@mysql.com's avatar
monty@mysql.com committed
3296
  {
3297
    if (check_access(thd,INSERT_ACL,"mysql",0,1,0,0))
monty@mysql.com's avatar
monty@mysql.com committed
3298
      break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3299
#ifdef HAVE_DLOPEN
3300 3301
    if (sp_find_routine(thd, TYPE_ENUM_FUNCTION, lex->spname,
                        &thd->sp_func_cache, FALSE))
monty@mysql.com's avatar
monty@mysql.com committed
3302
    {
3303
      my_error(ER_UDF_EXISTS, MYF(0), lex->spname->m_name.str);
monty@mysql.com's avatar
monty@mysql.com committed
3304 3305
      goto error;
    }
3306
    if (!(res = mysql_create_function(thd, &lex->udf)))
monty@mysql.com's avatar
monty@mysql.com committed
3307
      send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3308
#else
hf@deer.(none)'s avatar
hf@deer.(none) committed
3309
    my_error(ER_CANT_OPEN_LIBRARY, MYF(0), lex->udf.dl, 0, "feature disabled");
3310
    res= TRUE;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3311 3312
#endif
    break;
monty@mysql.com's avatar
monty@mysql.com committed
3313
  }
hf@deer.(none)'s avatar
hf@deer.(none) committed
3314
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3315 3316
  case SQLCOM_CREATE_USER:
  {
3317
    if (check_access(thd, INSERT_ACL, "mysql", 0, 1, 1, 0) &&
3318
        check_global_access(thd,CREATE_USER_ACL))
3319
      break;
3320 3321
    if (end_active_trans(thd))
      goto error;
3322
    /* Conditionally writes to binlog */
3323 3324 3325 3326
    if (!(res= mysql_create_user(thd, lex->users_list)))
      send_ok(thd);
    break;
  }
3327 3328
  case SQLCOM_DROP_USER:
  {
3329
    if (check_access(thd, DELETE_ACL, "mysql", 0, 1, 1, 0) &&
3330
        check_global_access(thd,CREATE_USER_ACL))
3331
      break;
3332 3333
    if (end_active_trans(thd))
      goto error;
3334
    /* Conditionally writes to binlog */
3335
    if (!(res= mysql_drop_user(thd, lex->users_list)))
3336 3337 3338 3339 3340
      send_ok(thd);
    break;
  }
  case SQLCOM_RENAME_USER:
  {
3341
    if (check_access(thd, UPDATE_ACL, "mysql", 0, 1, 1, 0) &&
3342
        check_global_access(thd,CREATE_USER_ACL))
3343
      break;
3344 3345
    if (end_active_trans(thd))
      goto error;
3346
    /* Conditionally writes to binlog */
3347
    if (!(res= mysql_rename_user(thd, lex->users_list)))
3348 3349 3350 3351 3352
      send_ok(thd);
    break;
  }
  case SQLCOM_REVOKE_ALL:
  {
3353
    if (check_access(thd, UPDATE_ACL, "mysql", 0, 1, 1, 0) &&
3354
        check_global_access(thd,CREATE_USER_ACL))
3355
      break;
3356
    /* Conditionally writes to binlog */
3357 3358 3359 3360
    if (!(res = mysql_revoke_all(thd, lex->users_list)))
      send_ok(thd);
    break;
  }
3361 3362 3363 3364
  case SQLCOM_REVOKE:
  case SQLCOM_GRANT:
  {
    if (check_access(thd, lex->grant | lex->grant_tot_col | GRANT_ACL,
serg@serg.mylan's avatar
serg@serg.mylan committed
3365
		     first_table ?  first_table->db : select_lex->db,
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3366
		     first_table ? &first_table->grant.privilege : 0,
3367 3368 3369
		     first_table ? 0 : 1, 0,
                     first_table ? (bool) first_table->schema_table :
                     select_lex->db ? is_schema_db(select_lex->db) : 0))
3370 3371
      goto error;

3372
    if (thd->security_ctx->user)              // If not replication
3373
    {
3374
      LEX_USER *user, *tmp_user;
3375

3376
      List_iterator <LEX_USER> user_list(lex->users_list);
3377
      while ((tmp_user= user_list++))
3378
      {
3379 3380
        if (!(user= get_current_user(thd, tmp_user)))
          goto error;
3381 3382 3383 3384 3385 3386 3387 3388
        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);
3389
        if (strcmp(thd->security_ctx->user, user->user.str) ||
3390
            my_strcasecmp(system_charset_info,
3391
                          user->host.str, thd->security_ctx->host_or_ip))
3392 3393
        {
          // TODO: use check_change_password()
3394 3395
          if (is_acl_user(user->host.str, user->user.str) &&
              user->password.str &&
3396
              check_access(thd, UPDATE_ACL,"mysql",0,1,1,0))
3397 3398 3399 3400 3401 3402
          {
            my_message(ER_PASSWORD_NOT_ALLOWED,
                       ER(ER_PASSWORD_NOT_ALLOWED), MYF(0));
            goto error;
          }
        }
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
3403 3404
      }
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3405
    if (first_table)
3406
    {
3407 3408
      if (lex->type == TYPE_ENUM_PROCEDURE ||
          lex->type == TYPE_ENUM_FUNCTION)
3409 3410 3411 3412
      {
        uint grants= lex->all_privileges 
		   ? (PROC_ACLS & ~GRANT_ACL) | (lex->grant & GRANT_ACL)
		   : lex->grant;
3413
        if (check_grant_routine(thd, grants | GRANT_ACL, all_tables,
3414
                                lex->type == TYPE_ENUM_PROCEDURE, 0))
3415
	  goto error;
3416
        /* Conditionally writes to binlog */
3417 3418 3419 3420
        res= mysql_routine_grant(thd, all_tables,
                                 lex->type == TYPE_ENUM_PROCEDURE, 
                                 lex->users_list, grants,
                                 lex->sql_command == SQLCOM_REVOKE, 0);
3421 3422 3423
      }
      else
      {
3424 3425
	if (check_grant(thd,(lex->grant | lex->grant_tot_col | GRANT_ACL),
                        all_tables, 0, UINT_MAX, 0))
3426
	  goto error;
3427
        /* Conditionally writes to binlog */
3428 3429 3430 3431
        res= mysql_table_grant(thd, all_tables, lex->users_list,
			       lex->columns, lex->grant,
			       lex->sql_command == SQLCOM_REVOKE);
      }
3432 3433 3434
    }
    else
    {
3435
      if (lex->columns.elements || lex->type)
3436
      {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3437 3438
	my_message(ER_ILLEGAL_GRANT_FOR_TABLE, ER(ER_ILLEGAL_GRANT_FOR_TABLE),
                   MYF(0));
3439
        goto error;
3440 3441
      }
      else
3442
	/* Conditionally writes to binlog */
3443 3444 3445 3446
	res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
			  lex->sql_command == SQLCOM_REVOKE);
      if (!res)
      {
3447
	if (lex->sql_command == SQLCOM_GRANT)
3448
	{
3449
	  List_iterator <LEX_USER> str_list(lex->users_list);
3450 3451 3452 3453 3454
	  LEX_USER *user, *tmp_user;
	  while ((tmp_user=str_list++))
          {
            if (!(user= get_current_user(thd, tmp_user)))
              goto error;
3455
	    reset_mqh(user, 0);
3456
          }
3457
	}
3458 3459 3460 3461
      }
    }
    break;
  }
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
3462
#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/
monty@donna.mysql.com's avatar
monty@donna.mysql.com committed
3463
  case SQLCOM_RESET:
3464 3465 3466
    /*
      RESET commands are never written to the binary log, so we have to
      initialize this variable because RESET shares the same code as FLUSH
3467 3468 3469 3470
    */
    lex->no_write_to_binlog= 1;
  case SQLCOM_FLUSH:
  {
3471
    bool write_to_binlog;
3472
    if (check_global_access(thd,RELOAD_ACL))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3473
      goto error;
3474

3475 3476 3477 3478
    /*
      reload_acl_and_cache() will tell us if we are allowed to write to the
      binlog or not.
    */
3479
    if (!reload_acl_and_cache(thd, lex->type, first_table, &write_to_binlog))
3480 3481 3482 3483 3484
    {
      /*
        We WANT to write and we CAN write.
        ! we write after unlocking the table.
      */
3485 3486 3487
      /*
        Presumably, RESET and binlog writing doesn't require synchronization
      */
3488 3489
      if (!lex->no_write_to_binlog && write_to_binlog)
      {
3490
        write_bin_log(thd, FALSE, thd->query, thd->query_length);
3491 3492
      }
      send_ok(thd);
3493 3494
    } 
    
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3495
    break;
3496
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3497
  case SQLCOM_KILL:
3498 3499 3500
  {
    Item *it= (Item *)lex->value_list.head();

3501 3502 3503 3504 3505 3506 3507
    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;
    }

3508
    if ((!it->fixed && it->fix_fields(lex->thd, &it)) || it->check_cols(1))
3509 3510 3511 3512 3513
    {
      my_message(ER_SET_CONSTANTS_ONLY, ER(ER_SET_CONSTANTS_ONLY),
		 MYF(0));
      goto error;
    }
3514
    sql_kill(thd, (ulong)it->val_int(), lex->type & ONLY_KILL_QUERY);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3515
    break;
3516
  }
hf@deer.(none)'s avatar
hf@deer.(none) committed
3517
#ifndef NO_EMBEDDED_ACCESS_CHECKS
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3518
  case SQLCOM_SHOW_GRANTS:
3519 3520 3521 3522
  {
    LEX_USER *grant_user= get_current_user(thd, lex->grant_user);
    if (!grant_user)
      goto error;
3523
    if ((thd->security_ctx->priv_user &&
3524
	 !strcmp(thd->security_ctx->priv_user, grant_user->user.str)) ||
3525
	!check_access(thd, SELECT_ACL, "mysql",0,1,0,0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3526
    {
3527
      res = mysql_show_grants(thd, grant_user);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3528 3529
    }
    break;
3530
  }
hf@deer.(none)'s avatar
hf@deer.(none) committed
3531
#endif
3532
  case SQLCOM_HA_OPEN:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3533
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3534
    if (check_table_access(thd, SELECT_ACL, all_tables, 0))
3535
      goto error;
monty@mysql.com's avatar
monty@mysql.com committed
3536
    res= mysql_ha_open(thd, first_table, 0);
3537 3538
    break;
  case SQLCOM_HA_CLOSE:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3539 3540
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    res= mysql_ha_close(thd, first_table);
3541 3542
    break;
  case SQLCOM_HA_READ:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3543
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3544 3545 3546 3547 3548
    /*
      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.
    */
3549
    unit->set_limit(select_lex);
3550
    res= mysql_ha_read(thd, first_table, lex->ha_read_mode, lex->ident.str,
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VIEW  
bell@sanja.is.com.ua committed
3551
                       lex->insert_list, lex->ha_rkey_mode, select_lex->where,
3552
                       unit->select_limit_cnt, unit->offset_limit_cnt);
3553 3554
    break;

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3555
  case SQLCOM_BEGIN:
3556 3557 3558 3559 3560 3561
    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;
    }
3562
    if (begin_trans(thd))
3563
      goto error;
serg@serg.mylan's avatar
serg@serg.mylan committed
3564
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3565 3566
    break;
  case SQLCOM_COMMIT:
3567
    if (end_trans(thd, lex->tx_release ? COMMIT_RELEASE :
serg@serg.mylan's avatar
serg@serg.mylan committed
3568
                              lex->tx_chain ? COMMIT_AND_CHAIN : COMMIT))
3569
      goto error;
3570
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3571 3572
    break;
  case SQLCOM_ROLLBACK:
3573
    if (end_trans(thd, lex->tx_release ? ROLLBACK_RELEASE :
serg@serg.mylan's avatar
serg@serg.mylan committed
3574
                              lex->tx_chain ? ROLLBACK_AND_CHAIN : ROLLBACK))
3575
      goto error;
3576
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3577
    break;
serg@serg.mylan's avatar
serg@serg.mylan committed
3578
  case SQLCOM_RELEASE_SAVEPOINT:
serg@serg.mylan's avatar
serg@serg.mylan committed
3579
  {
3580 3581
    SAVEPOINT *sv;
    for (sv=thd->transaction.savepoints; sv; sv=sv->prev)
serg@serg.mylan's avatar
serg@serg.mylan committed
3582 3583 3584
    {
      if (my_strnncoll(system_charset_info,
                       (uchar *)lex->ident.str, lex->ident.length,
3585
                       (uchar *)sv->name, sv->length) == 0)
serg@serg.mylan's avatar
serg@serg.mylan committed
3586 3587
        break;
    }
3588
    if (sv)
serg@serg.mylan's avatar
serg@serg.mylan committed
3589
    {
3590
      if (ha_release_savepoint(thd, sv))
serg@serg.mylan's avatar
serg@serg.mylan committed
3591
        res= TRUE; // cannot happen
serg@serg.mylan's avatar
serg@serg.mylan committed
3592 3593
      else
        send_ok(thd);
3594
      thd->transaction.savepoints=sv->prev;
serg@serg.mylan's avatar
serg@serg.mylan committed
3595
    }
3596
    else
serg@serg.mylan's avatar
serg@serg.mylan committed
3597
      my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3598
    break;
serg@serg.mylan's avatar
serg@serg.mylan committed
3599
  }
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3600
  case SQLCOM_ROLLBACK_TO_SAVEPOINT:
serg@serg.mylan's avatar
serg@serg.mylan committed
3601
  {
3602 3603
    SAVEPOINT *sv;
    for (sv=thd->transaction.savepoints; sv; sv=sv->prev)
3604 3605 3606
    {
      if (my_strnncoll(system_charset_info,
                       (uchar *)lex->ident.str, lex->ident.length,
3607
                       (uchar *)sv->name, sv->length) == 0)
3608 3609
        break;
    }
3610
    if (sv)
3611
    {
3612
      if (ha_rollback_to_savepoint(thd, sv))
3613 3614
        res= TRUE; // cannot happen
      else
serg@serg.mylan's avatar
serg@serg.mylan committed
3615
      {
3616
        if (((thd->options & OPTION_KEEP_LOG) || thd->no_trans_update.all) &&
serg@serg.mylan's avatar
serg@serg.mylan committed
3617 3618 3619 3620 3621 3622
            !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);
      }
3623
      thd->transaction.savepoints=sv;
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3624 3625
    }
    else
3626
      my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3627
    break;
3628
  }
3629
  case SQLCOM_SAVEPOINT:
3630 3631
    if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN) ||
          thd->in_sub_stmt) || !opt_using_transactions)
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
3632
      send_ok(thd);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3633
    else
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 3662 3663 3664 3665 3666 3667 3668 3669 3670 3671
    {
      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);
      }
    }
3672
    break;
3673 3674
  case SQLCOM_CREATE_PROCEDURE:
  case SQLCOM_CREATE_SPFUNCTION:
monty@mysql.com's avatar
monty@mysql.com committed
3675
  {
3676
    uint namelen;
3677
    char *name;
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
3678
    int sp_result= SP_INTERNAL_ERROR;
3679

3680
    DBUG_ASSERT(lex->sphead != 0);
3681
    DBUG_ASSERT(lex->sphead->m_db.str); /* Must be initialized in the parser */
3682 3683 3684 3685
    /*
      Verify that the database name is allowed, optionally
      lowercase it.
    */
3686
    if (check_db_name(&lex->sphead->m_db))
3687
    {
3688
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->sphead->m_db.str);
3689
      goto create_sp_error;
3690 3691
    }

3692
    /*
3693 3694 3695
      Check that a database directory with this name
      exists. Design note: This won't work on virtual databases
      like information_schema.
3696 3697
    */
    if (check_db_dir_existence(lex->sphead->m_db.str))
3698
    {
3699
      my_error(ER_BAD_DB_ERROR, MYF(0), lex->sphead->m_db.str);
3700
      goto create_sp_error;
3701
    }
3702

3703 3704
    if (check_access(thd, CREATE_PROC_ACL, lex->sphead->m_db.str, 0, 0, 0,
                     is_schema_db(lex->sphead->m_db.str)))
3705
      goto create_sp_error;
3706

3707 3708
    if (end_active_trans(thd))
      goto create_sp_error;
3709 3710

    name= lex->sphead->name(&namelen);
3711
#ifdef HAVE_DLOPEN
monty@mysql.com's avatar
monty@mysql.com committed
3712 3713 3714
    if (lex->sphead->m_type == TYPE_ENUM_FUNCTION)
    {
      udf_func *udf = find_udf(name, namelen);
3715

monty@mysql.com's avatar
monty@mysql.com committed
3716
      if (udf)
3717
      {
3718 3719
        my_error(ER_UDF_EXISTS, MYF(0), name);
        goto create_sp_error;
3720
      }
monty@mysql.com's avatar
monty@mysql.com committed
3721 3722 3723
    }
#endif

3724 3725
    if (sp_process_definer(thd))
      goto create_sp_error;
3726

malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
3727 3728
    res= (sp_result= lex->sphead->create(thd));
    switch (sp_result) {
3729
    case SP_OK:
3730
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3731
      /* only add privileges if really neccessary */
3732
      if (sp_automatic_privileges && !opt_noacl &&
3733
          check_routine_access(thd, DEFAULT_CREATE_PROC_ACLS,
3734
                               lex->sphead->m_db.str, name,
3735
                               lex->sql_command == SQLCOM_CREATE_PROCEDURE, 1))
3736
      {
3737
        if (sp_grant_privileges(thd, lex->sphead->m_db.str, name,
3738
                                lex->sql_command == SQLCOM_CREATE_PROCEDURE))
3739 3740 3741
          push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                       ER_PROC_AUTO_GRANT_FAIL,
                       ER(ER_PROC_AUTO_GRANT_FAIL));
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
3742
        close_thread_tables(thd);
3743
      }
3744
#endif
monty@mysql.com's avatar
monty@mysql.com committed
3745
    break;
3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764
    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:
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
3765
    if (sp_result != SP_OK )
3766 3767 3768 3769
      goto error;
    send_ok(thd);
    break; /* break super switch */
  } /* end case group bracket */
3770 3771 3772 3773
  case SQLCOM_CALL:
    {
      sp_head *sp;

3774 3775 3776 3777 3778 3779 3780 3781 3782
      /*
        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;

      /*
3783 3784
        By this moment all needed SPs should be in cache so no need to look 
        into DB. 
3785
      */
3786 3787
      if (!(sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname,
                                &thd->sp_proc_cache, TRUE)))
3788
      {
3789
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "PROCEDURE",
3790
                 lex->spname->m_qname.str);
3791
	goto error;
3792 3793 3794
      }
      else
      {
pem@mysql.comhem.se's avatar
pem@mysql.comhem.se committed
3795
	ha_rows select_limit;
monty@mysql.com's avatar
monty@mysql.com committed
3796 3797
        /* bits that should be cleared in thd->server_status */
	uint bits_to_be_cleared= 0;
3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808 3809
        /*
          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;
        }
3810

3811
	my_bool save_no_send_ok= thd->net.no_send_ok;
3812
	thd->net.no_send_ok= TRUE;
3813
	if (sp->m_flags & sp_head::MULTI_RESULTS)
3814
	{
3815
	  if (! (thd->client_capabilities & CLIENT_MULTI_RESULTS))
3816
	  {
3817 3818 3819 3820
            /*
              The client does not support multiple result sets being sent
              back
            */
3821
	    my_error(ER_SP_BADSELECT, MYF(0), sp->m_qname.str);
3822
	    thd->net.no_send_ok= save_no_send_ok;
3823 3824
	    goto error;
	  }
monty@mysql.com's avatar
monty@mysql.com committed
3825 3826 3827 3828 3829 3830 3831
          /*
            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;
3832 3833
	}

3834
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3835
	if (check_routine_access(thd, EXECUTE_ACL,
3836
				 sp->m_db.str, sp->m_name.str, TRUE, FALSE))
3837
	{
3838
	  thd->net.no_send_ok= save_no_send_ok;
3839 3840
	  goto error;
	}
3841
#endif
pem@mysql.comhem.se's avatar
pem@mysql.comhem.se committed
3842 3843
	select_limit= thd->variables.select_limit;
	thd->variables.select_limit= HA_POS_ERROR;
3844

3845
        /* 
3846
          We never write CALL statements into binlog:
3847 3848 3849 3850 3851
           - 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.
3852
        */
3853
	res= sp->execute_procedure(thd, &lex->value_list);
3854 3855 3856
	/*
          If warnings have been cleared, we have to clear total_warn_count
          too, otherwise the clients get confused.
3857 3858 3859 3860
	 */
	if (thd->warn_list.is_empty())
	  thd->total_warn_count= 0;

pem@mysql.comhem.se's avatar
pem@mysql.comhem.se committed
3861
	thd->variables.select_limit= select_limit;
3862

3863
	thd->net.no_send_ok= save_no_send_ok;
monty@mysql.com's avatar
monty@mysql.com committed
3864
        thd->server_status&= ~bits_to_be_cleared;
3865

3866
	if (!res)
monty@mysql.com's avatar
monty@mysql.com committed
3867 3868
	  send_ok(thd, (ulong) (thd->row_count_func < 0 ? 0 :
                                thd->row_count_func));
3869
	else
3870 3871
        {
          DBUG_ASSERT(thd->net.report_error == 1 || thd->killed);
3872
	  goto error;		// Substatement should already have sent error
3873
        }
3874
      }
3875
      break;
3876 3877
    }
  case SQLCOM_ALTER_PROCEDURE:
3878
  case SQLCOM_ALTER_FUNCTION:
3879
    {
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
3880
      int sp_result;
3881 3882 3883 3884
      sp_head *sp;
      st_sp_chistics chistics;

      memcpy(&chistics, &lex->sp_chistics, sizeof(chistics));
3885
      if (lex->sql_command == SQLCOM_ALTER_PROCEDURE)
3886 3887
        sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname,
                            &thd->sp_proc_cache, FALSE);
3888
      else
3889 3890
        sp= sp_find_routine(thd, TYPE_ENUM_FUNCTION, lex->spname,
                            &thd->sp_func_cache, FALSE);
monty@mysql.com's avatar
monty@mysql.com committed
3891
      mysql_reset_errors(thd, 0);
3892
      if (! sp)
3893 3894
      {
	if (lex->spname->m_db.str)
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
3895
	  sp_result= SP_KEY_NOT_FOUND;
3896 3897 3898 3899 3900 3901
	else
	{
	  my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
	  goto error;
	}
      }
3902 3903
      else
      {
3904 3905 3906
        if (check_routine_access(thd, ALTER_PROC_ACL, sp->m_db.str, 
				 sp->m_name.str,
                                 lex->sql_command == SQLCOM_ALTER_PROCEDURE, 0))
3907
	  goto error;
3908 3909 3910

        if (end_active_trans(thd)) 
          goto error;
3911
	memcpy(&lex->sp_chistics, &chistics, sizeof(lex->sp_chistics));
3912 3913
        if ((sp->m_type == TYPE_ENUM_FUNCTION) &&
            !trust_function_creators &&  mysql_bin_log.is_open() &&
3914 3915 3916 3917 3918 3919
            !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));
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
3920
          sp_result= SP_INTERNAL_ERROR;
3921 3922 3923
        }
        else
        {
3924 3925 3926 3927 3928 3929
          /*
            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.
          */
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
3930
          /* Conditionally writes to binlog */
anozdrin/alik@ibm's avatar
anozdrin/alik@ibm committed
3931 3932 3933 3934 3935 3936 3937 3938 3939

          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);
3940
        }
3941
      }
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
3942
      switch (sp_result)
3943
      {
3944
      case SP_OK:
3945
	send_ok(thd);
3946 3947
	break;
      case SP_KEY_NOT_FOUND:
3948 3949
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
3950 3951
	goto error;
      default:
3952 3953
	my_error(ER_SP_CANT_ALTER, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
3954
	goto error;
3955
      }
3956
      break;
3957 3958
    }
  case SQLCOM_DROP_PROCEDURE:
3959
  case SQLCOM_DROP_FUNCTION:
3960
    {
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
3961
      int sp_result;
3962 3963
      int type= (lex->sql_command == SQLCOM_DROP_PROCEDURE ?
                 TYPE_ENUM_PROCEDURE : TYPE_ENUM_FUNCTION);
3964

malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
3965
      sp_result= sp_routine_exists_in_table(thd, type, lex->spname);
monty@mysql.com's avatar
monty@mysql.com committed
3966
      mysql_reset_errors(thd, 0);
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
3967
      if (sp_result == SP_OK)
3968
      {
3969 3970 3971
        char *db= lex->spname->m_db.str;
	char *name= lex->spname->m_name.str;

3972 3973
	if (check_routine_access(thd, ALTER_PROC_ACL, db, name,
                                 lex->sql_command == SQLCOM_DROP_PROCEDURE, 0))
bell@sanja.is.com.ua's avatar
merge  
bell@sanja.is.com.ua committed
3974
          goto error;
3975 3976 3977

        if (end_active_trans(thd)) 
          goto error;
3978
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3979
	if (sp_automatic_privileges && !opt_noacl &&
3980 3981
	    sp_revoke_privileges(thd, db, name, 
                                 lex->sql_command == SQLCOM_DROP_PROCEDURE))
3982 3983 3984 3985 3986
	{
	  push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 
		       ER_PROC_AUTO_REVOKE_FAIL,
		       ER(ER_PROC_AUTO_REVOKE_FAIL));
	}
3987
#endif
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
3988
        /* Conditionally writes to binlog */
anozdrin/alik@ibm's avatar
anozdrin/alik@ibm committed
3989 3990 3991 3992 3993 3994

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

        sp_result= sp_drop_routine(thd, type, lex->spname);
3995 3996 3997
      }
      else
      {
3998
#ifdef HAVE_DLOPEN
3999 4000 4001 4002 4003 4004
	if (lex->sql_command == SQLCOM_DROP_FUNCTION)
	{
          udf_func *udf = find_udf(lex->spname->m_name.str,
                                   lex->spname->m_name.length);
          if (udf)
          {
4005
	    if (check_access(thd, DELETE_ACL, "mysql", 0, 1, 0, 0))
4006
	      goto error;
4007

4008
	    if (!(res = mysql_drop_function(thd, &lex->spname->m_name)))
4009
	    {
4010 4011
	      send_ok(thd);
	      break;
4012 4013
	    }
	  }
4014
	}
4015
#endif
4016
	if (lex->spname->m_db.str)
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
4017
	  sp_result= SP_KEY_NOT_FOUND;
4018 4019 4020 4021 4022
	else
	{
	  my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
	  goto error;
	}
4023
      }
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
4024 4025
      res= sp_result;
      switch (sp_result) {
4026
      case SP_OK:
4027
	send_ok(thd);
4028 4029
	break;
      case SP_KEY_NOT_FOUND:
4030 4031
	if (lex->drop_if_exists)
	{
4032
	  push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
4033
			      ER_SP_DOES_NOT_EXIST, ER(ER_SP_DOES_NOT_EXIST),
4034
			      SP_COM_STRING(lex), lex->spname->m_name.str);
4035
	  res= FALSE;
4036 4037 4038
	  send_ok(thd);
	  break;
	}
4039 4040
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4041 4042
	goto error;
      default:
4043 4044
	my_error(ER_SP_DROP_FAILED, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4045
	goto error;
4046
      }
4047
      break;
4048
    }
4049 4050
  case SQLCOM_SHOW_CREATE_PROC:
    {
anozdrin/alik@ibm's avatar
anozdrin/alik@ibm committed
4051 4052
      if (sp_show_create_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname))
      {
4053 4054
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
4055 4056 4057 4058 4059 4060
	goto error;
      }
      break;
    }
  case SQLCOM_SHOW_CREATE_FUNC:
    {
anozdrin/alik@ibm's avatar
anozdrin/alik@ibm committed
4061 4062
      if (sp_show_create_routine(thd, TYPE_ENUM_FUNCTION, lex->spname))
      {
4063 4064
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
4065 4066 4067 4068
	goto error;
      }
      break;
    }
4069
#ifdef NOT_USED
4070 4071
  case SQLCOM_SHOW_STATUS_PROC:
    {
anozdrin/alik@ibm's avatar
anozdrin/alik@ibm committed
4072 4073
      res= sp_show_status_routine(thd, TYPE_ENUM_PROCEDURE,
                                  (lex->wild ? lex->wild->ptr() : NullS));
4074 4075 4076 4077
      break;
    }
  case SQLCOM_SHOW_STATUS_FUNC:
    {
anozdrin/alik@ibm's avatar
anozdrin/alik@ibm committed
4078 4079
      res= sp_show_status_routine(thd, TYPE_ENUM_FUNCTION,
                                  (lex->wild ? lex->wild->ptr() : NullS));
4080 4081
      break;
    }
4082
#endif
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4083 4084 4085 4086 4087 4088 4089
#ifndef DBUG_OFF
  case SQLCOM_SHOW_PROC_CODE:
  case SQLCOM_SHOW_FUNC_CODE:
    {
      sp_head *sp;

      if (lex->sql_command == SQLCOM_SHOW_PROC_CODE)
bell@sanja.is.com.ua's avatar
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4090 4091
        sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname,
                            &thd->sp_proc_cache, FALSE);
pem@mysql.com's avatar
pem@mysql.com committed
4092
      else
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4093 4094
        sp= sp_find_routine(thd, TYPE_ENUM_FUNCTION, lex->spname,
                            &thd->sp_func_cache, FALSE);
4095
      if (!sp || sp->show_routine_code(thd))
4096 4097
      {
        /* We don't distinguish between errors for now */
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4098 4099 4100 4101 4102 4103 4104
        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
4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117
  case SQLCOM_SHOW_CREATE_TRIGGER:
    {
      if (lex->spname->m_name.length > NAME_LEN)
      {
        my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str);
        goto error;
      }

      if (show_create_trigger(thd, lex->spname))
        goto error; /* Error has been already logged. */

      break;
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4118 4119
  case SQLCOM_CREATE_VIEW:
    {
4120 4121 4122 4123
      /*
        Note: SQLCOM_CREATE_VIEW also handles 'ALTER VIEW' commands
        as specified through the thd->lex->create_view_mode flag.
      */
4124 4125 4126
      if (end_active_trans(thd))
        goto error;

4127
      res= mysql_create_view(thd, first_table, thd->lex->create_view_mode);
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VIEW  
bell@sanja.is.com.ua committed
4128 4129 4130 4131
      break;
    }
  case SQLCOM_DROP_VIEW:
    {
4132 4133 4134
      if (check_table_access(thd, DROP_ACL, all_tables, 0) ||
          end_active_trans(thd))
        goto error;
4135 4136
      /* Conditionally writes to binlog. */
      res= mysql_drop_view(thd, first_table, thd->lex->drop_mode);
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VIEW  
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4137 4138
      break;
    }
4139 4140
  case SQLCOM_CREATE_TRIGGER:
  {
4141 4142 4143
    if (end_active_trans(thd))
      goto error;

4144
    /* Conditionally writes to binlog. */
4145 4146
    res= mysql_create_or_drop_trigger(thd, all_tables, 1);

4147 4148 4149 4150
    break;
  }
  case SQLCOM_DROP_TRIGGER:
  {
4151 4152 4153
    if (end_active_trans(thd))
      goto error;

4154
    /* Conditionally writes to binlog. */
4155 4156 4157
    res= mysql_create_or_drop_trigger(thd, all_tables, 0);
    break;
  }
4158
  case SQLCOM_XA_START:
4159 4160
    if (thd->transaction.xid_state.xa_state == XA_IDLE &&
        thd->lex->xa_opt == XA_RESUME)
4161
    {
4162
      if (! thd->transaction.xid_state.xid.eq(thd->lex->xid))
4163 4164 4165 4166
      {
        my_error(ER_XAER_NOTA, MYF(0));
        break;
      }
4167
      thd->transaction.xid_state.xa_state=XA_ACTIVE;
4168 4169 4170
      send_ok(thd);
      break;
    }
serg@serg.mylan's avatar
serg@serg.mylan committed
4171
    if (thd->lex->xa_opt != XA_NONE)
4172 4173 4174 4175
    { // JOIN is not supported yet. TODO
      my_error(ER_XAER_INVAL, MYF(0));
      break;
    }
4176
    if (thd->transaction.xid_state.xa_state != XA_NOTR)
4177
    {
4178
      my_error(ER_XAER_RMFAIL, MYF(0),
4179
               xa_state_names[thd->transaction.xid_state.xa_state]);
4180 4181 4182 4183 4184 4185 4186
      break;
    }
    if (thd->active_transaction() || thd->locked_tables)
    {
      my_error(ER_XAER_OUTSIDE, MYF(0));
      break;
    }
4187 4188 4189 4190 4191 4192 4193 4194 4195
    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);
4196
    thd->options= ((thd->options & ~(OPTION_KEEP_LOG)) | OPTION_BEGIN);
4197
    thd->no_trans_update.all= FALSE;
4198 4199 4200 4201 4202 4203 4204 4205 4206 4207
    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;
    }
4208
    if (thd->transaction.xid_state.xa_state != XA_ACTIVE)
4209
    {
4210
      my_error(ER_XAER_RMFAIL, MYF(0),
4211
               xa_state_names[thd->transaction.xid_state.xa_state]);
4212 4213
      break;
    }
4214
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
4215 4216 4217 4218
    {
      my_error(ER_XAER_NOTA, MYF(0));
      break;
    }
4219
    thd->transaction.xid_state.xa_state=XA_IDLE;
4220 4221 4222
    send_ok(thd);
    break;
  case SQLCOM_XA_PREPARE:
4223
    if (thd->transaction.xid_state.xa_state != XA_IDLE)
4224
    {
4225
      my_error(ER_XAER_RMFAIL, MYF(0),
4226
               xa_state_names[thd->transaction.xid_state.xa_state]);
4227 4228
      break;
    }
4229
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
4230 4231 4232 4233 4234 4235 4236
    {
      my_error(ER_XAER_NOTA, MYF(0));
      break;
    }
    if (ha_prepare(thd))
    {
      my_error(ER_XA_RBROLLBACK, MYF(0));
4237 4238
      xid_cache_delete(&thd->transaction.xid_state);
      thd->transaction.xid_state.xa_state=XA_NOTR;
4239 4240
      break;
    }
4241
    thd->transaction.xid_state.xa_state=XA_PREPARED;
4242 4243 4244
    send_ok(thd);
    break;
  case SQLCOM_XA_COMMIT:
4245
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
4246
    {
4247 4248
      XID_STATE *xs=xid_cache_search(thd->lex->xid);
      if (!xs || xs->in_thd)
4249
        my_error(ER_XAER_NOTA, MYF(0));
serg@serg.mylan's avatar
serg@serg.mylan committed
4250
      else
4251 4252 4253
      {
        ha_commit_or_rollback_by_xid(thd->lex->xid, 1);
        xid_cache_delete(xs);
serg@serg.mylan's avatar
serg@serg.mylan committed
4254
        send_ok(thd);
4255
      }
4256 4257
      break;
    }
4258
    if (thd->transaction.xid_state.xa_state == XA_IDLE &&
monty@mysql.com's avatar
monty@mysql.com committed
4259
        thd->lex->xa_opt == XA_ONE_PHASE)
4260
    {
4261 4262 4263
      int r;
      if ((r= ha_commit(thd)))
        my_error(r == 1 ? ER_XA_RBROLLBACK : ER_XAER_RMERR, MYF(0));
4264 4265 4266
      else
        send_ok(thd);
    }
4267
    else if (thd->transaction.xid_state.xa_state == XA_PREPARED &&
monty@mysql.com's avatar
monty@mysql.com committed
4268
             thd->lex->xa_opt == XA_NONE)
4269
    {
4270 4271 4272
      if (wait_if_global_read_lock(thd, 0, 0))
      {
        ha_rollback(thd);
4273
        my_error(ER_XAER_RMERR, MYF(0));
4274
      }
4275
      else
4276 4277 4278 4279 4280 4281 4282
      {
        if (ha_commit_one_phase(thd, 1))
          my_error(ER_XAER_RMERR, MYF(0));
        else
          send_ok(thd);
        start_waiting_global_read_lock(thd);
      }
4283 4284 4285
    }
    else
    {
4286
      my_error(ER_XAER_RMFAIL, MYF(0),
4287
               xa_state_names[thd->transaction.xid_state.xa_state]);
4288 4289
      break;
    }
4290 4291
    thd->options&= ~(OPTION_BEGIN | OPTION_KEEP_LOG);
    thd->no_trans_update.all= FALSE;
4292
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
4293 4294
    xid_cache_delete(&thd->transaction.xid_state);
    thd->transaction.xid_state.xa_state=XA_NOTR;
4295 4296
    break;
  case SQLCOM_XA_ROLLBACK:
4297
    if (!thd->transaction.xid_state.xid.eq(thd->lex->xid))
4298
    {
4299 4300
      XID_STATE *xs=xid_cache_search(thd->lex->xid);
      if (!xs || xs->in_thd)
4301
        my_error(ER_XAER_NOTA, MYF(0));
serg@serg.mylan's avatar
serg@serg.mylan committed
4302
      else
4303 4304 4305
      {
        ha_commit_or_rollback_by_xid(thd->lex->xid, 0);
        xid_cache_delete(xs);
serg@serg.mylan's avatar
serg@serg.mylan committed
4306
        send_ok(thd);
4307
      }
4308 4309
      break;
    }
4310 4311
    if (thd->transaction.xid_state.xa_state != XA_IDLE &&
        thd->transaction.xid_state.xa_state != XA_PREPARED)
4312
    {
4313
      my_error(ER_XAER_RMFAIL, MYF(0),
4314
               xa_state_names[thd->transaction.xid_state.xa_state]);
4315 4316 4317 4318 4319 4320
      break;
    }
    if (ha_rollback(thd))
      my_error(ER_XAER_RMERR, MYF(0));
    else
      send_ok(thd);
4321
    thd->options&= ~(OPTION_BEGIN | OPTION_KEEP_LOG);
4322
    thd->no_trans_update.all= FALSE;
4323
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
4324 4325
    xid_cache_delete(&thd->transaction.xid_state);
    thd->transaction.xid_state.xa_state=XA_NOTR;
4326 4327
    break;
  case SQLCOM_XA_RECOVER:
4328
    res= mysql_xa_recover(thd);
4329
    break;
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353
  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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4354 4355 4356 4357 4358
  case SQLCOM_CREATE_SERVER:
  {
    int error;
    LEX *lex= thd->lex;
    DBUG_PRINT("info", ("case SQLCOM_CREATE_SERVER"));
4359 4360 4361 4362

    if (check_global_access(thd, SUPER_ACL))
      break;

patg@radha.tangent.org's avatar
patg@radha.tangent.org committed
4363 4364
    if ((error= create_server(thd, &lex->server_options)))
    {
4365
      DBUG_PRINT("info", ("problem creating server <%s>",
patg@radha.tangent.org's avatar
patg@radha.tangent.org committed
4366 4367 4368 4369 4370 4371 4372 4373 4374 4375 4376 4377
                          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"));
4378 4379 4380 4381

    if (check_global_access(thd, SUPER_ACL))
      break;

patg@radha.tangent.org's avatar
patg@radha.tangent.org committed
4382 4383
    if ((error= alter_server(thd, &lex->server_options)))
    {
4384
      DBUG_PRINT("info", ("problem altering server <%s>",
patg@radha.tangent.org's avatar
patg@radha.tangent.org committed
4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395 4396
                          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"));
4397 4398 4399 4400

    if (check_global_access(thd, SUPER_ACL))
      break;

patg@radha.tangent.org's avatar
patg@radha.tangent.org committed
4401 4402
    if ((err_code= drop_server(thd, &lex->server_options)))
    {
4403
      if (! lex->drop_if_exists && err_code == ER_FOREIGN_SERVER_DOESNT_EXIST)
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patg@radha.tangent.org committed
4404 4405 4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417
      {
        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;
  }
4418
  default:
4419
#ifndef EMBEDDED_LIBRARY
4420
    DBUG_ASSERT(0);                             /* Impossible */
4421
#endif
4422
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4423 4424
    break;
  }
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
4425

monty@mysql.com's avatar
monty@mysql.com committed
4426
  thd->proc_info="query end";
4427 4428

  /*
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
4429
    Binlog-related cleanup:
4430 4431 4432 4433 4434 4435 4436 4437 4438 4439 4440
    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);

4441
  /*
4442 4443
    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
4444 4445 4446 4447
    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))
4448
    thd->row_count_func= -1;
4449

4450
  goto finish;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4451 4452

error:
4453 4454
  res= TRUE;

4455
finish:
4456 4457 4458 4459 4460 4461 4462 4463 4464
  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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bk@work.mysql.com committed
4465 4466 4467
}


4468 4469 4470 4471 4472 4473 4474 4475 4476 4477 4478 4479 4480 4481 4482 4483 4484 4485 4486 4487 4488 4489 4490
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()))
4491
        return 1;                               /* purecov: inspected */
4492 4493 4494 4495 4496 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506 4507 4508 4509
      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()))
4510
        return 1;                               /* purecov: inspected */
4511 4512 4513 4514 4515 4516 4517 4518 4519 4520
      query_cache_store_query(thd, all_tables);
      res= handle_select(thd, lex, result, 0);
      if (result != lex->result)
        delete result;
    }
  }
  return res;
}


bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4521
/*
4522
  Check grants for commands which work only with one table.
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4523

4524
  SYNOPSIS
4525
    check_single_table_access()
monty@mysql.com's avatar
monty@mysql.com committed
4526
    thd			Thread handler
4527
    privilege		requested privilege
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4528
    all_tables		global table list of query
4529 4530
    no_errors           FALSE/TRUE - report/don't report error to
                            the client (using my_error() call).
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4531 4532 4533

  RETURN
    0 - OK
monty@mysql.com's avatar
monty@mysql.com committed
4534
    1 - access denied, error is sent to client
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4535 4536
*/

4537
bool check_single_table_access(THD *thd, ulong privilege, 
4538
                               TABLE_LIST *all_tables, bool no_errors)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4539
{
4540 4541 4542 4543 4544 4545
  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;

4546 4547 4548 4549 4550 4551 4552 4553
  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,
4554
		   &all_tables->grant.privilege, 0, no_errors,
4555
                   test(all_tables->schema_table)))
4556
    goto deny;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4557

4558
  /* Show only 1 table for check_grant */
4559
  if (!(all_tables->belong_to_view &&
4560
        (thd->lex->sql_command == SQLCOM_SHOW_FIELDS)) &&
4561
      check_grant(thd, privilege, all_tables, 0, 1, no_errors))
4562 4563 4564
    goto deny;

  thd->security_ctx= backup_ctx;
4565 4566 4567 4568 4569 4570 4571 4572 4573 4574 4575 4576 4577 4578 4579 4580 4581 4582 4583 4584 4585 4586 4587 4588
  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)
{
4589
  if (check_single_table_access (thd,privilege,all_tables, FALSE))
4590
    return 1;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4591

4592
  /* Check rights on tables of subselects and implictly opened tables */
4593
  TABLE_LIST *subselects_tables, *view= all_tables->view ? all_tables : 0;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4594
  if ((subselects_tables= all_tables->next_global))
monty@mysql.com's avatar
monty@mysql.com committed
4595
  {
4596 4597 4598 4599 4600 4601
    /*
      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)
    {
4602
      if (check_single_table_access (thd, privilege, subselects_tables, FALSE))
4603 4604 4605 4606 4607
        return 1;
      subselects_tables= subselects_tables->next_global;
    }
    if (subselects_tables &&
        (check_table_access(thd, SELECT_ACL, subselects_tables, 0)))
4608
      return 1;
monty@mysql.com's avatar
monty@mysql.com committed
4609 4610
  }
  return 0;
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4611 4612 4613
}


bk@work.mysql.com's avatar
bk@work.mysql.com committed
4614
/****************************************************************************
4615
  Get the user (global) and database privileges for all used tables
4616 4617 4618 4619 4620 4621 4622 4623 4624 4625 4626 4627 4628

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

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

    save_priv	In this we store global and db level grants for the table
		Note that we don't store db level grants if the global grants
monty@mashka.mysql.fi's avatar
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4629 4630
                is enough to satisfy the request and the global grants contains
                a SELECT grant.
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4631 4632 4633
****************************************************************************/

bool
4634
check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
4635
	     bool dont_check_global_grants, bool no_errors, bool schema_db)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4636
{
4637
  Security_context *sctx= thd->security_ctx;
4638 4639
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  ulong db_access;
4640 4641 4642 4643 4644 4645 4646 4647 4648 4649 4650
  /*
    GRANT command:
    In case of database level grant the database name may be a pattern,
    in case of table|column level grant the database name can not be a pattern.
    We use 'dont_check_global_grants' as a flag to determine
    if it's database level grant command 
    (see SQLCOM_GRANT case, mysql_execute_command() function) and
    set db_is_pattern according to 'dont_check_global_grants' value.
  */
  bool  db_is_pattern= (test(want_access & GRANT_ACL) &&
                        dont_check_global_grants);
4651 4652
#endif
  ulong dummy;
4653 4654
  DBUG_ENTER("check_access");
  DBUG_PRINT("enter",("db: %s  want_access: %lu  master_access: %lu",
4655
                      db ? db : "", want_access, sctx->master_access));
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4656 4657 4658 4659 4660
  if (save_priv)
    *save_priv=0;
  else
    save_priv= &dummy;

4661
  if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4662
  {
4663
    DBUG_PRINT("error",("No database"));
4664
    if (!no_errors)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4665 4666
      my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR),
                 MYF(0));                       /* purecov: tested */
4667
    DBUG_RETURN(TRUE);				/* purecov: tested */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4668 4669
  }

4670 4671
  if (schema_db)
  {
4672 4673
    if (!(sctx->master_access & FILE_ACL) && (want_access & FILE_ACL) ||
        (want_access & ~(SELECT_ACL | EXTRA_ACL | FILE_ACL)))
4674 4675
    {
      if (!no_errors)
4676 4677
      {
        const char *db_name= db ? db : thd->db;
4678
        my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
4679 4680
                 sctx->priv_user, sctx->priv_host, db_name);
      }
4681 4682 4683 4684 4685 4686 4687 4688 4689
      DBUG_RETURN(TRUE);
    }
    else
    {
      *save_priv= SELECT_ACL;
      DBUG_RETURN(FALSE);
    }
  }

monty@mysql.com's avatar
monty@mysql.com committed
4690 4691 4692
#ifdef NO_EMBEDDED_ACCESS_CHECKS
  DBUG_RETURN(0);
#else
4693
  if ((sctx->master_access & want_access) == want_access)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4694
  {
4695 4696 4697 4698 4699
    /*
      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
    */
4700 4701
    db_access= sctx->db_access;
    if (!(sctx->master_access & SELECT_ACL) &&
4702
	(db && (!thd->db || db_is_pattern || strcmp(db,thd->db))))
4703 4704 4705
      db_access=acl_get(sctx->host, sctx->ip, sctx->priv_user, db,
                        db_is_pattern);
    *save_priv=sctx->master_access | db_access;
4706
    DBUG_RETURN(FALSE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4707
  }
4708
  if (((want_access & ~sctx->master_access) & ~(DB_ACLS | EXTRA_ACL)) ||
4709
      ! db && dont_check_global_grants)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4710
  {						// We can never grant this
4711
    DBUG_PRINT("error",("No possible access"));
4712
    if (!no_errors)
4713
      my_error(ER_ACCESS_DENIED_ERROR, MYF(0),
4714 4715
               sctx->priv_user,
               sctx->priv_host,
4716 4717 4718
               (thd->password ?
                ER(ER_YES) :
                ER(ER_NO)));                    /* purecov: tested */
4719
    DBUG_RETURN(TRUE);				/* purecov: tested */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4720 4721 4722
  }

  if (db == any_db)
4723
    DBUG_RETURN(FALSE);				// Allow select on anything
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
4724

4725
  if (db && (!thd->db || db_is_pattern || strcmp(db,thd->db)))
4726 4727
    db_access= acl_get(sctx->host, sctx->ip, sctx->priv_user, db,
                       db_is_pattern);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4728
  else
4729
    db_access= sctx->db_access;
4730
  DBUG_PRINT("info",("db_access: %lu", db_access));
monty@mysql.com's avatar
monty@mysql.com committed
4731
  /* Remove SHOW attribute and access rights we already have */
4732
  want_access &= ~(sctx->master_access | EXTRA_ACL);
4733 4734
  DBUG_PRINT("info",("db_access: %lu  want_access: %lu",
                     db_access, want_access));
4735
  db_access= ((*save_priv=(db_access | sctx->master_access)) & want_access);
4736

bk@work.mysql.com's avatar
bk@work.mysql.com committed
4737
  if (db_access == want_access ||
4738
      (!dont_check_global_grants &&
4739
       !(want_access & ~(db_access | TABLE_ACLS | PROC_ACLS))))
4740
    DBUG_RETURN(FALSE);				/* Ok */
4741 4742

  DBUG_PRINT("error",("Access denied"));
4743
  if (!no_errors)
4744
    my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
4745
             sctx->priv_user, sctx->priv_host,
4746 4747 4748
             (db ? db : (thd->db ?
                         thd->db :
                         "unknown")));          /* purecov: tested */
4749
  DBUG_RETURN(TRUE);				/* purecov: tested */
monty@mysql.com's avatar
monty@mysql.com committed
4750
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4751 4752 4753
}


4754 4755 4756 4757 4758 4759 4760 4761 4762
/*
  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
4763
    One gets access right if one has ANY of the rights in want_access
4764 4765 4766 4767 4768 4769 4770 4771
    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
*/
4772 4773

bool check_global_access(THD *thd, ulong want_access)
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
4774
{
monty@mysql.com's avatar
monty@mysql.com committed
4775 4776 4777
#ifdef NO_EMBEDDED_ACCESS_CHECKS
  return 0;
#else
4778
  char command[128];
4779
  if ((thd->security_ctx->master_access & want_access))
4780 4781
    return 0;
  get_privilege_desc(command, sizeof(command), want_access);
4782
  my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), command);
4783
  return 1;
monty@mysql.com's avatar
monty@mysql.com committed
4784
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
4785 4786 4787
}


4788 4789
static bool check_show_access(THD *thd, TABLE_LIST *table)
{
4790
  switch (get_schema_table_idx(table->schema_table)) {
4791 4792
  case SCH_SCHEMATA:
    return (specialflag & SPECIAL_SKIP_SHOW_DB) &&
4793
      check_global_access(thd, SHOW_DB_ACL);
4794 4795 4796 4797 4798

  case SCH_TABLE_NAMES:
  case SCH_TABLES:
  case SCH_VIEWS:
  case SCH_TRIGGERS:
4799 4800 4801
  case SCH_EVENTS:
  {
    const char *dst_db_name= table->schema_select_lex->db;
4802

4803
    DBUG_ASSERT(dst_db_name);
4804

4805 4806 4807 4808
    if (check_access(thd, SELECT_ACL, dst_db_name,
                     &thd->col_access, FALSE, FALSE,
                     is_schema_db(dst_db_name)))
      return TRUE;
4809

4810 4811 4812 4813 4814 4815 4816
    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;
4817 4818
    }

4819 4820 4821
    return FALSE;
  }

4822 4823
  case SCH_COLUMNS:
  case SCH_STATISTICS:
4824 4825 4826
  {
    TABLE_LIST *dst_table;
    dst_table= (TABLE_LIST *) table->schema_select_lex->table_list.first;
4827

4828
    DBUG_ASSERT(dst_table);
4829

4830 4831 4832 4833 4834 4835
    if (check_access(thd, SELECT_ACL | EXTRA_ACL,
                     dst_table->db,
                     &dst_table->grant.privilege,
                     FALSE, FALSE,
                     test(dst_table->schema_table)))
      return FALSE;
4836

4837
    return (check_grant(thd, SELECT_ACL, dst_table, 2, UINT_MAX, FALSE));
4838 4839
  }
  default:
4840 4841 4842 4843 4844 4845 4846
    break;
  }

  return FALSE;
}


bk@work.mysql.com's avatar
bk@work.mysql.com committed
4847
/*
4848 4849 4850 4851 4852 4853 4854 4855 4856 4857 4858 4859 4860 4861 4862 4863 4864 4865 4866 4867
  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
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4868 4869
*/

4870
bool
4871
check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables,
4872
		   bool no_errors)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4873
{
4874
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4875
  TABLE_LIST *org_tables= tables;
malff/marcsql@weblab.(none)'s avatar
malff/marcsql@weblab.(none) committed
4876
#endif
4877
  TABLE_LIST *first_not_own_table= thd->lex->first_not_own_table();
4878
  Security_context *sctx= thd->security_ctx, *backup_ctx= thd->security_ctx;
4879
  /*
4880 4881 4882
    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.
4883
  */
4884
  for (; tables != first_not_own_table; tables= tables->next_global)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4885
  {
4886 4887 4888 4889 4890
    if (tables->security_ctx)
      sctx= tables->security_ctx;
    else
      sctx= backup_ctx;

4891
    if (tables->schema_table && 
4892
        (want_access & ~(SELECT_ACL | EXTRA_ACL | FILE_ACL)))
4893 4894 4895
    {
      if (!no_errors)
        my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
4896
                 sctx->priv_user, sctx->priv_host,
4897
                 INFORMATION_SCHEMA_NAME.str);
4898 4899
      return TRUE;
    }
4900 4901 4902 4903 4904
    /*
       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);
4905 4906 4907 4908 4909 4910 4911 4912 4913 4914

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

      continue;
    }

    if (tables->derived ||
4915
        (tables->table && (int)tables->table->s->tmp_table))
Sinisa@sinisa.nasamreza.org's avatar
Sinisa@sinisa.nasamreza.org committed
4916
      continue;
4917 4918
    thd->security_ctx= sctx;
    if ((sctx->master_access & want_access) ==
4919
        (want_access & ~EXTRA_ACL) &&
4920
	thd->db)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4921
      tables->grant.privilege= want_access;
4922
    else if (tables->db && thd->db && strcmp(tables->db, thd->db) == 0)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4923
    {
4924
      if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
4925
			 0, no_errors, test(tables->schema_table)))
4926
        goto deny;                            // Access denied
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4927
    }
4928
    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
4929
			  0, no_errors, test(tables->schema_table)))
4930
      goto deny;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4931
  }
4932
  thd->security_ctx= backup_ctx;
4933
  return check_grant(thd,want_access & ~EXTRA_ACL,org_tables,
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bell@sanja.is.com.ua committed
4934
		       test(want_access & EXTRA_ACL), UINT_MAX, no_errors);
4935 4936 4937
deny:
  thd->security_ctx= backup_ctx;
  return TRUE;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4938 4939
}

4940

4941
bool
4942 4943
check_routine_access(THD *thd, ulong want_access,char *db, char *name,
		     bool is_proc, bool no_errors)
4944 4945 4946 4947 4948
{
  TABLE_LIST tables[1];
  
  bzero((char *)tables, sizeof(TABLE_LIST));
  tables->db= db;
4949
  tables->table_name= tables->alias= name;
4950
  
monty@mysql.com's avatar
monty@mysql.com committed
4951 4952 4953 4954 4955 4956 4957
  /*
    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)
4958 4959
    tables->grant.privilege= want_access;
  else if (check_access(thd,want_access,db,&tables->grant.privilege,
monty@mysql.com's avatar
monty@mysql.com committed
4960
			0, no_errors, 0))
4961 4962
    return TRUE;
  
4963
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4964
    return check_grant_routine(thd, want_access, tables, is_proc, no_errors);
4965
#else
4966
  return FALSE;
4967
#endif
4968 4969
}

4970 4971 4972 4973 4974 4975 4976 4977 4978 4979 4980 4981 4982 4983 4984

/*
  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
*/

4985 4986
bool check_some_routine_access(THD *thd, const char *db, const char *name,
                               bool is_proc)
4987 4988
{
  ulong save_priv;
4989
  if (thd->security_ctx->master_access & SHOW_PROC_ACLS)
4990
    return FALSE;
4991 4992 4993 4994 4995
  /*
    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) ||
4996 4997
      (save_priv & SHOW_PROC_ACLS))
    return FALSE;
4998
  return check_routine_level_acl(thd, db, name, is_proc);
4999 5000 5001
}


5002 5003 5004 5005 5006 5007 5008 5009 5010 5011 5012 5013 5014 5015 5016 5017 5018 5019 5020 5021 5022 5023 5024 5025 5026
/*
  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,
5027 5028
                        &table->grant.privilege, 0, 1,
                        test(table->schema_table)) &&
5029
          !check_grant(thd, access, table, 0, 1, 1))
5030 5031 5032 5033 5034 5035 5036 5037
        DBUG_RETURN(0);
    }
  }
  DBUG_PRINT("exit",("no matching access rights"));
  DBUG_RETURN(1);
}


5038 5039
bool check_merge_table_access(THD *thd, char *db,
			      TABLE_LIST *table_list)
5040 5041 5042 5043
{
  int error=0;
  if (table_list)
  {
5044
    /* Check that all tables use the current database */
5045
    TABLE_LIST *tmp;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
5046
    for (tmp= table_list; tmp; tmp= tmp->next_local)
5047 5048 5049 5050
    {
      if (!tmp->db || !tmp->db[0])
	tmp->db=db;
    }
5051
    error=check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
hf@deer.(none)'s avatar
hf@deer.(none) committed
5052
			     table_list,0);
5053 5054 5055 5056
  }
  return error;
}

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5057

bk@work.mysql.com's avatar
bk@work.mysql.com committed
5058 5059 5060 5061
/****************************************************************************
	Check stack size; Send error if there isn't enough stack to continue
****************************************************************************/

5062 5063 5064
#ifndef EMBEDDED_LIBRARY

#define used_stack(A,B) (long)(A > B ? A - B : B - A)
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bk@work.mysql.com committed
5065

monty@mysql.com's avatar
monty@mysql.com committed
5066 5067 5068 5069
#ifndef DBUG_OFF
long max_stack_used;
#endif

5070 5071 5072 5073 5074 5075 5076
/*
  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,
5077
			 uchar *buf __attribute__((unused)))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5078 5079
{
  long stack_used;
5080
  DBUG_ASSERT(thd == current_thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5081
  if ((stack_used=used_stack(thd->thread_stack,(char*) &stack_used)) >=
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monty@mysql.com committed
5082
      (long) (thread_stack - margin))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5083
  {
5084 5085 5086
    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));
5087
    thd->fatal_error();
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bk@work.mysql.com committed
5088 5089
    return 1;
  }
monty@mysql.com's avatar
monty@mysql.com committed
5090 5091 5092
#ifndef DBUG_OFF
  max_stack_used= max(max_stack_used, stack_used);
#endif
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bk@work.mysql.com committed
5093 5094
  return 0;
}
5095
#endif /* EMBEDDED_LIBRARY */
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5096 5097 5098 5099

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

5100
bool my_yyoverflow(short **yyss, YYSTYPE **yyvs, ulong *yystacksize)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5101
{
5102
  LEX	*lex= current_thd->lex;
5103
  ulong old_info=0;
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bk@work.mysql.com committed
5104 5105 5106 5107 5108
  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);
5109 5110
  if (!(lex->yacc_yyvs= (uchar*)
	my_realloc(lex->yacc_yyvs,
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bk@work.mysql.com committed
5111 5112
		   *yystacksize*sizeof(**yyvs),
		   MYF(MY_ALLOW_ZERO_PTR | MY_FREE_ON_ERROR))) ||
5113 5114
      !(lex->yacc_yyss= (uchar*)
	my_realloc(lex->yacc_yyss,
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5115 5116 5117 5118 5119
		   *yystacksize*sizeof(**yyss),
		   MYF(MY_ALLOW_ZERO_PTR | MY_FREE_ON_ERROR))))
    return 1;
  if (old_info)
  {						// Copy old info from stack
5120 5121
    memcpy(lex->yacc_yyss, (uchar*) *yyss, old_info*sizeof(**yyss));
    memcpy(lex->yacc_yyvs, (uchar*) *yyvs, old_info*sizeof(**yyvs));
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5122 5123 5124 5125 5126 5127 5128
  }
  *yyss=(short*) lex->yacc_yyss;
  *yyvs=(YYSTYPE*) lex->yacc_yyvs;
  return 0;
}


5129 5130 5131 5132 5133 5134
/*
 Reset THD part responsible for command processing state.

 DESCRIPTION
   This needs to be called before execution of every statement
   (prepared or conventional).
5135
   It is not called by substatements of routines.
5136 5137 5138 5139 5140 5141 5142 5143 5144 5145

 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");
5146
  DBUG_ASSERT(!thd->spcont); /* not for substatements of routines */
5147
  thd->free_list= 0;
5148
  thd->select_number= 1;
5149 5150 5151 5152
  /*
    Those two lines below are theoretically unneeded as
    THD::cleanup_after_query() should take care of this already.
  */
5153
  thd->auto_inc_intervals_in_cur_stmt_for_binlog.empty();
5154 5155 5156
  thd->stmt_depends_on_first_successful_insert_id_in_prev_stmt= 0;

  thd->query_start_used= 0;
5157
  thd->is_fatal_error= thd->time_zone_used= 0;
monty@mysql.com's avatar
monty@mysql.com committed
5158
  thd->server_status&= ~ (SERVER_MORE_RESULTS_EXISTS | 
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monty@mysql.com committed
5159 5160
                          SERVER_QUERY_NO_INDEX_USED |
                          SERVER_QUERY_NO_GOOD_INDEX_USED);
5161 5162 5163 5164 5165 5166
  /*
    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)))
5167 5168 5169 5170
  {
    thd->options&= ~OPTION_KEEP_LOG;
    thd->no_trans_update.all= FALSE;
  }
5171
  DBUG_ASSERT(thd->security_ctx== &thd->main_security_ctx);
5172
  thd->tmp_table_used= 0;
5173 5174
  if (!thd->in_sub_stmt)
  {
5175
    if (opt_bin_log)
5176
    {
5177
      reset_dynamic(&thd->user_var_events);
5178 5179
      thd->user_var_events_alloc= thd->mem_root;
    }
5180
    thd->clear_error();
5181 5182 5183 5184
    thd->total_warn_count=0;			// Warnings for this query
    thd->rand_used= 0;
    thd->sent_row_count= thd->examined_row_count= 0;
  }
5185 5186 5187 5188
  /*
    Because we come here only for start of top-statements, binlog format is
    constant inside a complex statement (using stored functions) etc.
  */
5189 5190
  thd->reset_current_stmt_binlog_row_based();

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5191 5192 5193
  DBUG_VOID_RETURN;
}

5194

5195 5196 5197
void
mysql_init_select(LEX *lex)
{
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5198
  SELECT_LEX *select_lex= lex->current_select;
5199
  select_lex->init_select();
5200
  lex->wild= 0;
5201 5202
  if (select_lex == &lex->select_lex)
  {
5203
    DBUG_ASSERT(lex->result == 0);
5204 5205
    lex->exchange= 0;
  }
5206 5207
}

5208

5209
bool
5210
mysql_new_select(LEX *lex, bool move_down)
5211
{
5212
  SELECT_LEX *select_lex;
5213
  THD *thd= lex->thd;
5214 5215
  DBUG_ENTER("mysql_new_select");

5216
  if (!(select_lex= new (thd->mem_root) SELECT_LEX()))
5217
    DBUG_RETURN(1);
5218
  select_lex->select_number= ++thd->select_number;
5219
  select_lex->parent_lex= lex; /* Used in init_query. */
5220 5221
  select_lex->init_query();
  select_lex->init_select();
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5222 5223
  lex->nest_level++;
  select_lex->nest_level= lex->nest_level;
5224 5225 5226 5227 5228
  /*
    Don't evaluate this subquery during statement prepare even if
    it's a constant one. The flag is switched off in the end of
    mysql_stmt_prepare.
  */
konstantin@mysql.com's avatar
konstantin@mysql.com committed
5229
  if (thd->stmt_arena->is_stmt_prepare())
5230
    select_lex->uncacheable|= UNCACHEABLE_PREPARE;
5231 5232
  if (move_down)
  {
5233
    SELECT_LEX_UNIT *unit;
5234
    lex->subqueries= TRUE;
5235
    /* first select_lex of subselect or derived table */
5236
    if (!(unit= new (thd->mem_root) SELECT_LEX_UNIT()))
5237
      DBUG_RETURN(1);
5238

5239 5240
    unit->init_query();
    unit->init_select();
5241
    unit->thd= thd;
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bell@sanja.is.com.ua committed
5242
    unit->include_down(lex->current_select);
5243 5244
    unit->link_next= 0;
    unit->link_prev= 0;
5245
    unit->return_to= lex->current_select;
5246
    select_lex->include_down(unit);
5247 5248 5249 5250 5251
    /*
      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;
5252 5253
  }
  else
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5254
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
5255 5256
    if (lex->current_select->order_list.first && !lex->current_select->braces)
    {
5257
      my_error(ER_WRONG_USAGE, MYF(0), "UNION", "ORDER BY");
5258
      DBUG_RETURN(1);
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
5259
    }
5260
    select_lex->include_neighbour(lex->current_select);
5261 5262 5263 5264 5265
    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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5266
  }
peter@mysql.com's avatar
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5267

5268
  select_lex->master_unit()->global_parameters= select_lex;
5269
  select_lex->include_global((st_select_lex_node**)&lex->all_selects_list);
5270
  lex->current_select= select_lex;
5271 5272 5273 5274 5275
  /*
    in subquery is SELECT query and we allow resolution of names in SELECT
    list
  */
  select_lex->context.resolve_in_select_list= TRUE;
5276
  DBUG_RETURN(0);
5277
}
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bk@work.mysql.com committed
5278

5279 5280 5281 5282 5283 5284 5285 5286 5287 5288 5289 5290 5291 5292 5293
/*
  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)
{
5294
  THD *thd;
5295
  LEX *lex;
5296
  LEX_STRING tmp, null_lex_string;
5297 5298
  Item *var;
  char buff[MAX_SYS_VAR_LENGTH*2+4+8], *end;
5299
  DBUG_ENTER("create_select_for_variable");
5300 5301

  thd= current_thd;
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pem@mysql.telia.com committed
5302
  lex= thd->lex;
5303 5304 5305 5306
  mysql_init_select(lex);
  lex->sql_command= SQLCOM_SELECT;
  tmp.str= (char*) var_name;
  tmp.length=strlen(var_name);
5307
  bzero((char*) &null_lex_string.str, sizeof(null_lex_string));
5308 5309 5310 5311
  /*
    We set the name of Item to @@session.var_name because that then is used
    as the column name in the output.
  */
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monty@mysql.com committed
5312 5313 5314 5315 5316 5317
  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);
  }
5318 5319 5320
  DBUG_VOID_RETURN;
}

5321

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monty@hundin.mysql.fi committed
5322 5323
void mysql_init_multi_delete(LEX *lex)
{
5324
  lex->sql_command=  SQLCOM_DELETE_MULTI;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5325
  mysql_init_select(lex);
5326 5327
  lex->select_lex.select_limit= 0;
  lex->unit.select_limit_cnt= HA_POS_ERROR;
5328
  lex->select_lex.table_list.save_and_clear(&lex->auxiliary_table_list);
5329
  lex->lock_option= using_update_log ? TL_READ_NO_INSERT : TL_READ;
bell@sanja.is.com.ua's avatar
VIEW  
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5330 5331
  lex->query_tables= 0;
  lex->query_tables_last= &lex->query_tables;
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monty@hundin.mysql.fi committed
5332
}
5333

5334

5335 5336 5337 5338
/*
  When you modify mysql_parse(), you may need to mofify
  mysql_test_parse_for_slave() in this same file.
*/
5339

5340 5341 5342 5343 5344 5345 5346 5347 5348 5349 5350
/**
  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)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5351 5352
{
  DBUG_ENTER("mysql_parse");
5353 5354 5355

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

5356 5357 5358 5359 5360 5361 5362 5363 5364 5365 5366 5367 5368 5369 5370 5371 5372 5373
  /*
    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);
5374

5375
  if (query_cache_send_result_to_client(thd, (char*) inBuf, length) <= 0)
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5376
  {
5377
    LEX *lex= thd->lex;
5378

5379 5380
    sp_cache_flush_obsolete(&thd->sp_proc_cache);
    sp_cache_flush_obsolete(&thd->sp_func_cache);
5381 5382 5383

    Lex_input_stream lip(thd, inBuf, length);

5384
    bool err= parse_sql(thd, &lip, NULL);
5385 5386
    *found_semicolon= lip.found_semicolon;

5387
    if (!err)
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5388
    {
hf@deer.(none)'s avatar
hf@deer.(none) committed
5389
#ifndef NO_EMBEDDED_ACCESS_CHECKS
5390
      if (mqh_used && thd->user_connect &&
5391
	  check_mqh(thd, lex->sql_command))
5392 5393 5394 5395
      {
	thd->net.error = 0;
      }
      else
hf@deer.(none)'s avatar
hf@deer.(none) committed
5396
#endif
5397
      {
5398
	if (! thd->net.report_error)
5399
	{
5400 5401 5402 5403 5404 5405 5406 5407 5408 5409
          /*
            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.
          */
5410 5411
          if (*found_semicolon &&
              (thd->query_length= (ulong)(*found_semicolon - thd->query)))
5412 5413
            thd->query_length--;
          /* Actually execute the query */
5414 5415 5416
          lex->set_trg_event_type_for_tables();
          mysql_execute_command(thd);
          query_cache_end_of_result(thd);
5417
	}
5418
      }
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5419 5420
    }
    else
5421
    {
5422
      DBUG_ASSERT(thd->net.report_error);
5423
      DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
5424
			 thd->is_fatal_error));
5425 5426

      query_cache_abort(&thd->net);
5427
    }
5428 5429 5430 5431 5432 5433
    if (thd->lex->sphead)
    {
      delete thd->lex->sphead;
      thd->lex->sphead= 0;
    }
    lex->unit.cleanup();
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monty@hundin.mysql.fi committed
5434
    thd->proc_info="freeing items";
5435
    thd->end_statement();
5436
    thd->cleanup_after_query();
5437
    DBUG_ASSERT(thd->change_list.is_empty());
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5438
  }
5439 5440 5441 5442 5443 5444
  else
  {
    /* There are no multi queries in the cache. */
    *found_semicolon= NULL;
  }

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bk@work.mysql.com committed
5445 5446 5447 5448
  DBUG_VOID_RETURN;
}


monty@mysql.com's avatar
monty@mysql.com committed
5449
#ifdef HAVE_REPLICATION
5450 5451 5452 5453 5454 5455 5456 5457 5458 5459 5460
/*
  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)
{
5461
  LEX *lex= thd->lex;
5462
  bool error= 0;
monty@mysql.com's avatar
monty@mysql.com committed
5463
  DBUG_ENTER("mysql_test_parse_for_slave");
5464

5465 5466 5467 5468
  Lex_input_stream lip(thd, inBuf, length);
  lex_start(thd);
  mysql_reset_thd_for_next_command(thd);

5469
  if (!parse_sql(thd, &lip, NULL) &&
5470
      all_tables_not_ok(thd,(TABLE_LIST*) lex->select_lex.table_list.first))
monty@mysql.com's avatar
monty@mysql.com committed
5471
    error= 1;                  /* Ignore question */
5472
  thd->end_statement();
5473
  thd->cleanup_after_query();
monty@mysql.com's avatar
monty@mysql.com committed
5474
  DBUG_RETURN(error);
5475
}
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monty@mysql.com committed
5476
#endif
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bk@work.mysql.com committed
5477

5478

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monty@mysql.com committed
5479

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bk@work.mysql.com committed
5480 5481 5482 5483 5484
/*****************************************************************************
** Store field definition for create
** Return 0 if ok
******************************************************************************/

5485
bool add_field_to_list(THD *thd, LEX_STRING *field_name, enum_field_types type,
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5486
		       char *length, char *decimals,
5487
		       uint type_modifier,
5488 5489
		       Item *default_value, Item *on_update_value,
                       LEX_STRING *comment,
5490 5491
		       char *change,
                       List<String> *interval_list, CHARSET_INFO *cs,
5492
		       uint uint_geom_type)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5493
{
5494
  register Create_field *new_field;
5495
  LEX  *lex= thd->lex;
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bk@work.mysql.com committed
5496 5497
  DBUG_ENTER("add_field_to_list");

5498 5499
  if (check_string_char_length(field_name, "", NAME_CHAR_LEN,
                               system_charset_info, 1))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5500
  {
5501
    my_error(ER_TOO_LONG_IDENT, MYF(0), field_name->str); /* purecov: inspected */
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bk@work.mysql.com committed
5502 5503 5504 5505
    DBUG_RETURN(1);				/* purecov: inspected */
  }
  if (type_modifier & PRI_KEY_FLAG)
  {
5506
    Key *key;
5507
    lex->col_list.push_back(new Key_part_spec(field_name->str, 0));
5508 5509 5510 5511
    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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bk@work.mysql.com committed
5512 5513 5514 5515
    lex->col_list.empty();
  }
  if (type_modifier & (UNIQUE_FLAG | UNIQUE_KEY_FLAG))
  {
5516
    Key *key;
5517
    lex->col_list.push_back(new Key_part_spec(field_name->str, 0));
5518 5519 5520 5521
    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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bk@work.mysql.com committed
5522 5523 5524
    lex->col_list.empty();
  }

5525
  if (default_value)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5526
  {
5527
    /* 
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5528 5529
      Default value should be literal => basic constants =>
      no need fix_fields()
5530 5531 5532
      
      We allow only one function as part of default value - 
      NOW() as default for TIMESTAMP type.
5533
    */
5534 5535
    if (default_value->type() == Item::FUNC_ITEM && 
        !(((Item_func*)default_value)->functype() == Item_func::NOW_FUNC &&
5536
         type == MYSQL_TYPE_TIMESTAMP))
5537
    {
5538
      my_error(ER_INVALID_DEFAULT, MYF(0), field_name->str);
5539 5540 5541
      DBUG_RETURN(1);
    }
    else if (default_value->type() == Item::NULL_ITEM)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5542
    {
5543
      default_value= 0;
5544 5545 5546
      if ((type_modifier & (NOT_NULL_FLAG | AUTO_INCREMENT_FLAG)) ==
	  NOT_NULL_FLAG)
      {
5547
	my_error(ER_INVALID_DEFAULT, MYF(0), field_name->str);
5548 5549 5550 5551 5552
	DBUG_RETURN(1);
      }
    }
    else if (type_modifier & AUTO_INCREMENT_FLAG)
    {
5553
      my_error(ER_INVALID_DEFAULT, MYF(0), field_name->str);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5554 5555 5556
      DBUG_RETURN(1);
    }
  }
5557

5558
  if (on_update_value && type != MYSQL_TYPE_TIMESTAMP)
5559
  {
5560
    my_error(ER_INVALID_ON_UPDATE, MYF(0), field_name->str);
5561 5562
    DBUG_RETURN(1);
  }
5563

5564
  if (type == MYSQL_TYPE_TIMESTAMP && length)
5565 5566 5567 5568 5569
  {
    /* Display widths are no longer supported for TIMSTAMP as of MySQL 4.1.
       In other words, for declarations such as TIMESTAMP(2), TIMESTAMP(4),
       and so on, the display width is ignored.
    */
msvensson@neptunus.(none)'s avatar
msvensson@neptunus.(none) committed
5570
    char buf[32];
5571
    my_snprintf(buf, sizeof(buf), "TIMESTAMP(%s)", length);
cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
5572
    WARN_DEPRECATED(thd, "5.2", buf, "'TIMESTAMP'");
5573 5574
  }

5575
  if (!(new_field= new Create_field()) ||
5576
      new_field->init(thd, field_name->str, type, length, decimals, type_modifier,
5577 5578
                      default_value, on_update_value, comment, change,
                      interval_list, cs, uint_geom_type))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
5579
    DBUG_RETURN(1);
5580

5581
  lex->alter_info.create_list.push_back(new_field);
5582 5583 5584 5585
  lex->last_field=new_field;
  DBUG_RETURN(0);
}

5586

bk@work.mysql.com's avatar
bk@work.mysql.com committed
5587 5588 5589 5590
/* Store position for column in ALTER TABLE .. ADD column */

void store_position_for_column(const char *name)
{
5591
  current_thd->lex->last_field->after=my_const_cast(char*) (name);
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bk@work.mysql.com committed
5592 5593 5594
}

bool
5595
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;
5606
  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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5616
bool add_to_list(THD *thd, SQL_LIST &list,Item *item,bool asc)
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{
  ORDER *order;
  DBUG_ENTER("add_to_list");
5620
  if (!(order = (ORDER *) thd->alloc(sizeof(ORDER))))
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5621
    DBUG_RETURN(1);
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  order->item_ptr= item;
  order->item= &order->item_ptr;
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5624 5625 5626
  order->asc = asc;
  order->free_me=0;
  order->used=0;
5627
  order->counter_used= 0;
5628
  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
5643
			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,
5655
					     LEX_STRING *alias,
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					     ulong table_options,
					     thr_lock_type lock_type,
5658
					     List<Index_hint> *index_hints_arg,
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5659
                                             LEX_STRING *option)
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{
  register TABLE_LIST *ptr;
5662
  TABLE_LIST *previous_table_ref; /* The table preceding the current one. */
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  char *alias_str;
5664
  LEX *lex= thd->lex;
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  DBUG_ENTER("add_table_to_list");
5666
  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;
5671 5672
  if (!test(table_options & TL_OPTION_ALIAS) && 
      check_table_name(table->table.str, table->table.length))
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  {
5674
    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 &&
5679
      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);
    }
5693
    if (!(alias_str= (char*) thd->memdup(alias_str,table->table.length+1)))
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5694
      DBUG_RETURN(0);
5695
  }
5696
  if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
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5697
    DBUG_RETURN(0);				/* purecov: inspected */
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5698
  if (table->db.str)
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  {
    ptr->db= table->db.str;
    ptr->db_length= table->db.length;
  }
5703
  else if (lex->copy_db_to(&ptr->db, &ptr->db_length))
5704
    DBUG_RETURN(0);
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5705

5706
  ptr->alias= alias_str;
5707
  if (lower_case_table_names && table->table.length)
5708
    table->table.length= my_casedn_str(files_charset_info, table->table.str);
5709 5710
  ptr->table_name=table->table.str;
  ptr->table_name_length=table->table.length;
5711
  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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5714
  ptr->ignore_leaves= test(table_options & TL_OPTION_IGNORE_LEAVES);
5715
  ptr->derived=	    table->sel;
5716
  if (!ptr->derived && !my_strcasecmp(system_charset_info, ptr->db,
5717
                                      INFORMATION_SCHEMA_NAME.str))
5718
  {
5719
    ST_SCHEMA_TABLE *schema_table= find_schema_table(thd, ptr->table_name);
5720 5721
    if (!schema_table ||
        (schema_table->hidden && 
5722
         (sql_command_flags[lex->sql_command] & CF_STATUS_COMMAND) == 0))
5723
    {
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5724
      my_error(ER_UNKNOWN_TABLE, MYF(0),
5725
               ptr->table_name, INFORMATION_SCHEMA_NAME.str);
5726 5727
      DBUG_RETURN(0);
    }
5728
    ptr->schema_table_name= ptr->table_name;
5729 5730
    ptr->schema_table= schema_table;
  }
5731
  ptr->select_lex=  lex->current_select;
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  ptr->cacheable_table= 1;
5733
  ptr->index_hints= index_hints_arg;
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5734
  ptr->option= option ? option->str : 0;
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  /* check that used name is unique */
5736
  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 ;
5742
	 tables ;
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	 tables=tables->next_local)
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    {
5745 5746
      if (!my_strcasecmp(table_alias_charset, alias_str, tables->alias) &&
	  !strcmp(ptr->db, tables->db))
5747
      {
5748
	my_error(ER_NONUNIQ_TABLE, MYF(0), alias_str); /* purecov: tested */
5749 5750
	DBUG_RETURN(0);				/* purecov: tested */
      }
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    }
  }
5753 5754 5755
  /* Store the table reference preceding the current one. */
  if (table_list.elements > 0)
  {
5756 5757 5758
    /*
      table_list.next points to the last inserted TABLE_LIST->next_local'
      element
5759
      We don't use the offsetof() macro here to avoid warnings from gcc
5760
    */
5761 5762 5763
    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;
5772
  }
5773

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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'.
  */
5780
  table_list.link_in_list((uchar*) ptr, (uchar**) &ptr->next_local);
5781
  ptr->next_name_resolution_table= NULL;
5782
  /* Link table in global list (all used tables) */
5783
  lex->add_to_query_tables(ptr);
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  DBUG_RETURN(ptr);
}

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5787

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/*
  Initialize a new table list for a nested join

  SYNOPSIS
5792
    init_nested_join()
5793
    thd         current thread
5794

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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");
5814

5815 5816
  if (!(ptr= (TABLE_LIST*) thd->calloc(ALIGN_SIZE(sizeof(TABLE_LIST))+
                                       sizeof(NESTED_JOIN))))
5817
    DBUG_RETURN(1);
5818
  nested_join= ptr->nested_join=
5819
    ((NESTED_JOIN*) ((uchar*) ptr + ALIGN_SIZE(sizeof(TABLE_LIST))));
5820

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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
5842
    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;
5852
  NESTED_JOIN *nested_join;
5853
  DBUG_ENTER("end_nested_join");
5854

5855
  DBUG_ASSERT(embedding);
5856 5857 5858
  ptr= embedding;
  join_list= ptr->join_list;
  embedding= ptr->embedding;
5859
  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;
  }
5869
  else if (nested_join->join_list.elements == 0)
5870 5871
  {
    join_list->pop();
5872
    ptr= 0;                                     // return value
5873
  }
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  DBUG_RETURN(ptr);
}


/*
  Nest last join operation

  SYNOPSIS
5882
    nest_last_join()
5883 5884 5885 5886 5887 5888
    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;
5898
  List<TABLE_LIST> *embedded_list;
5899
  DBUG_ENTER("nest_last_join");
5900

5901 5902
  if (!(ptr= (TABLE_LIST*) thd->calloc(ALIGN_SIZE(sizeof(TABLE_LIST))+
                                       sizeof(NESTED_JOIN))))
5903
    DBUG_RETURN(0);
5904
  nested_join= ptr->nested_join=
5905
    ((NESTED_JOIN*) ((uchar*) ptr + ALIGN_SIZE(sizeof(TABLE_LIST))));
5906

5907 5908
  ptr->embedding= embedding;
  ptr->join_list= join_list;
5909
  ptr->alias= (char*) "(nest_last_join)";
5910
  embedded_list= &nested_join->join_list;
5911
  embedded_list->empty();
5912 5913

  for (uint i=0; i < 2; i++)
5914 5915 5916 5917 5918
  {
    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;
5928
    }
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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
*/

5995
TABLE_LIST *st_select_lex::convert_right_join()
5996 5997
{
  TABLE_LIST *tab2= join_list->pop();
5998
  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
*/

6021
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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6038

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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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6069
  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;
6077 6078
  fake_select_lex->select_limit= 0;

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6079
  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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6083

6084
  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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6094
    thd_arg->lex->current_select= fake_select_lex;
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6095
  }
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6096
  thd_arg->lex->pop_context();
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  DBUG_RETURN(0);
}

6100

6101
/*
6102 6103
  Push a new name resolution context for a JOIN ... ON clause to the
  context stack of a query block.
6104 6105

  SYNOPSIS
6106
    push_new_name_resolution_context()
6107
    thd       pointer to current thread
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6108
    left_op   left  operand of the JOIN
6109 6110 6111 6112
    right_op  rigth operand of the JOIN

  DESCRIPTION
    Create a new name resolution context for a JOIN ... ON clause,
6113 6114 6115
    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.
6116 6117

  RETURN
6118 6119
    FALSE  if all is OK
    TRUE   if a memory allocation error occured
6120 6121
*/

6122 6123 6124
bool
push_new_name_resolution_context(THD *thd,
                                 TABLE_LIST *left_op, TABLE_LIST *right_op)
6125 6126
{
  Name_resolution_context *on_context;
6127
  if (!(on_context= new (thd->mem_root) Name_resolution_context))
6128
    return TRUE;
6129 6130 6131 6132 6133
  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();
6134
  return thd->lex->push_context(on_context);
6135 6136 6137 6138 6139 6140 6141 6142 6143 6144 6145 6146 6147 6148 6149 6150 6151 6152 6153 6154
}


/*
  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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6155
{
6156
  if (expr)
6157
  {
6158
    if (!b->on_expr)
6159
      b->on_expr= expr;
6160 6161
    else
    {
6162 6163 6164 6165 6166 6167
      /*
        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);
6168 6169
    }
    b->on_expr->top_level_item();
6170
  }
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6171 6172 6173
}


6174
/*
6175 6176
  Mark that there is a NATURAL JOIN or JOIN ... USING between two
  tables.
6177 6178 6179

  SYNOPSIS
    add_join_natural()
6180 6181 6182
    a			Left join argument
    b			Right join argument
    using_fields        Field names from USING clause
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6183
    lex                 The current st_select_lex
6184
  
6185
  IMPLEMENTATION
6186 6187 6188 6189 6190 6191 6192 6193 6194 6195
    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
6196 6197 6198
    SELECT * FROM t1 NATURAL LEFT JOIN t2
     <=>
    SELECT * FROM t1 LEFT JOIN t2 ON (t1.i=t2.i and t1.j=t2.j ... )
6199 6200 6201 6202 6203 6204 6205 6206 6207 6208 6209

    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
6210 6211
*/

malff/marcsql@weblab.(none)'s avatar
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6212 6213
void add_join_natural(TABLE_LIST *a, TABLE_LIST *b, List<String> *using_fields,
                      SELECT_LEX *lex)
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6214
{
6215
  b->natural_join= a;
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6216
  lex->prev_join_using= using_fields;
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6217 6218
}

6219

6220
/*
6221 6222 6223 6224
  Reload/resets privileges and the different caches.

  SYNOPSIS
    reload_acl_and_cache()
6225
    thd			Thread handler (can be NULL!)
6226 6227 6228 6229 6230
    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
6231 6232 6233
                        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.
6234 6235 6236

  RETURN
    0	 ok
6237
    !=0  error.  thd->killed or thd->net.report_error is set
6238 6239
*/

6240 6241
bool reload_acl_and_cache(THD *thd, ulong options, TABLE_LIST *tables,
                          bool *write_to_binlog)
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6242 6243 6244
{
  bool result=0;
  select_errors=0;				/* Write if more errors */
6245
  bool tmp_write_to_binlog= 1;
6246

6247
  DBUG_ASSERT(!thd || !thd->in_sub_stmt);
6248

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SCRUM  
hf@deer.(none) committed
6249
#ifndef NO_EMBEDDED_ACCESS_CHECKS
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6250 6251
  if (options & REFRESH_GRANT)
  {
6252 6253 6254 6255 6256 6257
    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)))
6258 6259
    {
      thd->thread_stack= (char*) &tmp_thd;
6260
      thd->store_globals();
6261
    }
6262 6263 6264 6265 6266 6267 6268 6269 6270 6271 6272 6273
    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;
    }
6274
    reset_mqh((LEX_USER *)NULL, TRUE);
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6275
  }
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SCRUM  
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6276
#endif
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6277 6278
  if (options & REFRESH_LOG)
  {
6279
    /*
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6280
      Flush the normal query log, the update log, the binary log,
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6281 6282
      the slow query log, the relay log (if it exists) and the log
      tables.
6283
    */
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monty@mashka.mysql.fi committed
6284

6285
    /*
monty@mysql.com's avatar
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6286 6287 6288 6289
      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)
6290 6291
    */
    tmp_write_to_binlog= 0;
6292 6293 6294 6295
    if( mysql_bin_log.is_open() )
    {
      mysql_bin_log.rotate_and_purge(RP_FORCE_ROTATE);
    }
6296
#ifdef HAVE_REPLICATION
6297
    pthread_mutex_lock(&LOCK_active_mi);
6298
    rotate_relay_log(active_mi);
6299
    pthread_mutex_unlock(&LOCK_active_mi);
6300
#endif
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cmiller@zippy.(none) committed
6301 6302 6303 6304 6305

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

    if (ha_flush_logs(NULL))
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6306
      result=1;
6307 6308
    if (flush_error_log())
      result=1;
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6309
  }
6310
#ifdef HAVE_QUERY_CACHE
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
6311 6312
  if (options & REFRESH_QUERY_CACHE_FREE)
  {
6313
    query_cache.pack();				// FLUSH QUERY CACHE
6314
    options &= ~REFRESH_QUERY_CACHE;    // Don't flush cache, just free memory
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monty@hundin.mysql.fi committed
6315 6316 6317
  }
  if (options & (REFRESH_TABLES | REFRESH_QUERY_CACHE))
  {
6318
    query_cache.flush();			// RESET QUERY CACHE
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
6319
  }
6320
#endif /*HAVE_QUERY_CACHE*/
6321 6322 6323 6324 6325
  /*
    Note that if REFRESH_READ_LOCK bit is set then REFRESH_TABLES is set too
    (see sql_yacc.yy)
  */
  if (options & (REFRESH_TABLES | REFRESH_READ_LOCK)) 
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6326
  {
6327
    if ((options & REFRESH_READ_LOCK) && thd)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6328
    {
6329 6330 6331 6332 6333 6334 6335 6336 6337 6338 6339
      /*
        We must not try to aspire a global read lock if we have a write
        locked table. This would lead to a deadlock when trying to
        reopen (and re-lock) the table after the flush.
      */
      if (thd->locked_tables)
      {
        THR_LOCK_DATA **lock_p= thd->locked_tables->locks;
        THR_LOCK_DATA **end_p= lock_p + thd->locked_tables->lock_count;

        for (; lock_p < end_p; lock_p++)
monty@mysql.com's avatar
monty@mysql.com committed
6340
        {
6341 6342 6343 6344 6345
          if ((*lock_p)->type == TL_WRITE)
          {
            my_error(ER_LOCK_OR_ACTIVE_TRANSACTION, MYF(0));
            return 1;
          }
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monty@mysql.com committed
6346
        }
6347
      }
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
6348 6349 6350 6351
      /*
	Writing to the binlog could cause deadlocks, as we don't log
	UNLOCK TABLES
      */
6352
      tmp_write_to_binlog= 0;
6353
      if (lock_global_read_lock(thd))
6354
	return 1;                               // Killed
6355 6356
      result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1,
                                 tables);
6357
      if (make_global_read_lock_block_commit(thd)) // Killed
6358 6359 6360 6361 6362
      {
        /* Don't leave things in a half-locked state */
        unlock_global_read_lock(thd);
        return 1;
      }
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bk@work.mysql.com committed
6363
    }
6364 6365
    else
      result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1, tables);
6366
    my_dbopt_cleanup();
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6367 6368 6369
  }
  if (options & REFRESH_HOSTS)
    hostname_cache_refresh();
monty@mysql.com's avatar
monty@mysql.com committed
6370
  if (thd && (options & REFRESH_STATUS))
6371
    refresh_status(thd);
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bk@work.mysql.com committed
6372 6373
  if (options & REFRESH_THREADS)
    flush_thread_cache();
6374
#ifdef HAVE_REPLICATION
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bk@work.mysql.com committed
6375
  if (options & REFRESH_MASTER)
6376
  {
6377
    DBUG_ASSERT(thd);
6378
    tmp_write_to_binlog= 0;
6379
    if (reset_master(thd))
6380
    {
6381
      result=1;
6382 6383
      thd->fatal_error();                       // Ensure client get error
    }
6384
  }
6385
#endif
6386
#ifdef OPENSSL
6387 6388 6389 6390 6391 6392
   if (options & REFRESH_DES_KEY_FILE)
   {
     if (des_key_file)
       result=load_des_key_file(des_key_file);
   }
#endif
6393
#ifdef HAVE_REPLICATION
6394 6395
 if (options & REFRESH_SLAVE)
 {
6396
   tmp_write_to_binlog= 0;
6397
   pthread_mutex_lock(&LOCK_active_mi);
6398
   if (reset_slave(thd, active_mi))
6399
     result=1;
6400
   pthread_mutex_unlock(&LOCK_active_mi);
6401
 }
6402
#endif
6403
 if (options & REFRESH_USER_RESOURCES)
6404
   reset_mqh((LEX_USER *) NULL, 0);             /* purecov: inspected */
6405
 *write_to_binlog= tmp_write_to_binlog;
6406
 return result;
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bk@work.mysql.com committed
6407 6408
}

6409

6410
/*
6411
  kills a thread
6412 6413 6414 6415 6416

  SYNOPSIS
    kill_one_thread()
    thd			Thread class
    id			Thread id
6417
    only_kill_query     Should it kill the query or the connection
6418 6419 6420 6421 6422

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

6423
uint kill_one_thread(THD *thd, ulong id, bool only_kill_query)
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bk@work.mysql.com committed
6424 6425 6426
{
  THD *tmp;
  uint error=ER_NO_SUCH_THREAD;
6427 6428
  DBUG_ENTER("kill_one_thread");
  DBUG_PRINT("enter", ("id=%lu only_kill=%d", id, only_kill_query));
6429 6430
  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For unlink from list
  I_List_iterator<THD> it(threads);
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bk@work.mysql.com committed
6431 6432
  while ((tmp=it++))
  {
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cmiller@zippy.(none) committed
6433 6434
    if (tmp->command == COM_DAEMON)
      continue;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6435 6436
    if (tmp->thread_id == id)
    {
6437 6438
      pthread_mutex_lock(&tmp->LOCK_delete);	// Lock from delete
      break;
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bk@work.mysql.com committed
6439 6440 6441
    }
  }
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
6442 6443
  if (tmp)
  {
6444 6445
    if ((thd->security_ctx->master_access & SUPER_ACL) ||
	!strcmp(thd->security_ctx->user, tmp->security_ctx->user))
6446
    {
hf@genie.(none)'s avatar
SCRUM  
hf@genie.(none) committed
6447
      tmp->awake(only_kill_query ? THD::KILL_QUERY : THD::KILL_CONNECTION);
6448 6449 6450 6451 6452 6453
      error=0;
    }
    else
      error=ER_KILL_DENIED_ERROR;
    pthread_mutex_unlock(&tmp->LOCK_delete);
  }
6454 6455 6456 6457
  DBUG_PRINT("exit", ("%d", error));
  DBUG_RETURN(error);
}

6458

6459 6460 6461 6462 6463 6464 6465 6466 6467 6468 6469 6470 6471 6472
/*
  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)))
6473
    send_ok(thd);
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bk@work.mysql.com committed
6474
  else
6475
    my_error(error, MYF(0), id);
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bk@work.mysql.com committed
6476 6477
}

timour@mysql.com's avatar
timour@mysql.com committed
6478

6479 6480
	/* If pointer is not a null pointer, append filename to it */

cmiller@zippy.(none)'s avatar
cmiller@zippy.(none) committed
6481 6482
bool append_file_to_dir(THD *thd, const char **filename_ptr,
                        const char *table_name)
6483
{
6484
  char buff[FN_REFLEN],*ptr, *end;
6485 6486 6487 6488 6489 6490 6491
  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))
  {
6492
    my_error(ER_WRONG_TABLE_NAME, MYF(0), *filename_ptr);
6493 6494 6495 6496
    return 1;
  }
  /* Fix is using unix filename format on dos */
  strmov(buff,*filename_ptr);
6497
  end=convert_dirname(buff, *filename_ptr, NullS);
6498
  if (!(ptr= (char*) thd->alloc((size_t) (end-buff) + strlen(table_name)+1)))
6499 6500
    return 1;					// End of memory
  *filename_ptr=ptr;
6501
  strxmov(ptr,buff,table_name,NullS);
6502 6503
  return 0;
}
6504

6505

6506 6507 6508 6509 6510 6511 6512 6513 6514 6515 6516 6517 6518 6519
/*
  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;
6520 6521
  LEX *lex= thd->lex;
  if (lex->current_select != &lex->select_lex)
6522 6523
  {
    char command[80];
6524 6525 6526
    Lex_input_stream *lip= thd->m_lip;
    strmake(command, lip->yylval->symbol.str,
	    min(lip->yylval->symbol.length, sizeof(command)-1));
6527
    my_error(ER_CANT_USE_OPTION_HERE, MYF(0), command);
6528 6529 6530 6531
    return 1;
  }
  return 0;
}
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6532

6533

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bell@sanja.is.com.ua committed
6534
Comp_creator *comp_eq_creator(bool invert)
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bell@sanja.is.com.ua committed
6535
{
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bell@sanja.is.com.ua committed
6536
  return invert?(Comp_creator *)&ne_creator:(Comp_creator *)&eq_creator;
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bell@sanja.is.com.ua committed
6537 6538
}

6539

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bell@sanja.is.com.ua committed
6540
Comp_creator *comp_ge_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6541
{
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bell@sanja.is.com.ua committed
6542
  return invert?(Comp_creator *)&lt_creator:(Comp_creator *)&ge_creator;
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bell@sanja.is.com.ua committed
6543 6544
}

6545

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bell@sanja.is.com.ua committed
6546
Comp_creator *comp_gt_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6547
{
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bell@sanja.is.com.ua committed
6548
  return invert?(Comp_creator *)&le_creator:(Comp_creator *)&gt_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6549 6550
}

6551

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bell@sanja.is.com.ua committed
6552
Comp_creator *comp_le_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6553
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6554
  return invert?(Comp_creator *)&gt_creator:(Comp_creator *)&le_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6555 6556
}

6557

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bell@sanja.is.com.ua committed
6558
Comp_creator *comp_lt_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6559
{
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bell@sanja.is.com.ua committed
6560
  return invert?(Comp_creator *)&ge_creator:(Comp_creator *)&lt_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6561 6562
}

6563

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bell@sanja.is.com.ua committed
6564
Comp_creator *comp_ne_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6565
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6566
  return invert?(Comp_creator *)&eq_creator:(Comp_creator *)&ne_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6567
}
6568 6569 6570 6571 6572 6573 6574 6575 6576 6577 6578 6579 6580 6581 6582 6583 6584 6585 6586 6587


/*
  Construct ALL/ANY/SOME subquery Item

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

  RETURN VALUE
    constructed Item (or 0 if out of memory)
*/
Item * all_any_subquery_creator(Item *left_expr,
				chooser_compare_func_creator cmp,
				bool all,
				SELECT_LEX *select_lex)
{
serg@serg.mylan's avatar
serg@serg.mylan committed
6588
  if ((cmp == &comp_eq_creator) && !all)       //  = ANY <=> IN
6589
    return new Item_in_subselect(left_expr, select_lex);
serg@serg.mylan's avatar
serg@serg.mylan committed
6590 6591

  if ((cmp == &comp_ne_creator) && all)        // <> ALL <=> NOT IN
6592 6593 6594
    return new Item_func_not(new Item_in_subselect(left_expr, select_lex));

  Item_allany_subselect *it=
6595
    new Item_allany_subselect(left_expr, cmp, select_lex, all);
6596
  if (all)
6597
    return it->upper_item= new Item_func_not_all(it);	/* ALL */
6598

6599
  return it->upper_item= new Item_func_nop_all(it);      /* ANY/SOME */
6600
}
6601 6602 6603 6604 6605 6606 6607


/*
  Multi update query pre-check

  SYNOPSIS
    multi_update_precheck()
6608
    thd		Thread handler
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
6609
    tables	Global/local table list (have to be the same)
6610

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6611
  RETURN VALUE
6612 6613
    FALSE OK
    TRUE  Error
6614
*/
6615

6616
bool multi_update_precheck(THD *thd, TABLE_LIST *tables)
6617 6618 6619 6620 6621
{
  const char *msg= 0;
  TABLE_LIST *table;
  LEX *lex= thd->lex;
  SELECT_LEX *select_lex= &lex->select_lex;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
6622
  DBUG_ENTER("multi_update_precheck");
6623 6624 6625

  if (select_lex->item_list.elements != lex->value_list.elements)
  {
6626
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
6627
    DBUG_RETURN(TRUE);
6628 6629 6630 6631 6632
  }
  /*
    Ensure that we have UPDATE or SELECT privilege for each table
    The exact privilege is checked in mysql_multi_update()
  */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
6633
  for (table= tables; table; table= table->next_local)
6634
  {
6635 6636 6637
    if (table->derived)
      table->grant.privilege= SELECT_ACL;
    else if ((check_access(thd, UPDATE_ACL, table->db,
6638 6639
                           &table->grant.privilege, 0, 1,
                           test(table->schema_table)) ||
6640
              check_grant(thd, UPDATE_ACL, table, 0, 1, 1)) &&
monty@mysql.com's avatar
monty@mysql.com committed
6641
             (check_access(thd, SELECT_ACL, table->db,
6642 6643
                           &table->grant.privilege, 0, 0,
                           test(table->schema_table)) ||
6644
              check_grant(thd, SELECT_ACL, table, 0, 1, 0)))
6645
      DBUG_RETURN(TRUE);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6646

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
6647
    table->table_in_first_from_clause= 1;
6648
  }
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6649 6650 6651
  /*
    Is there tables of subqueries?
  */
6652
  if (&lex->select_lex != lex->all_selects_list)
6653
  {
6654
    DBUG_PRINT("info",("Checking sub query list"));
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
6655
    for (table= tables; table; table= table->next_global)
6656
    {
6657
      if (!table->table_in_first_from_clause)
6658 6659
      {
	if (check_access(thd, SELECT_ACL, table->db,
6660 6661
			 &table->grant.privilege, 0, 0,
                         test(table->schema_table)) ||
6662
	    check_grant(thd, SELECT_ACL, table, 0, 1, 0))
6663
	  DBUG_RETURN(TRUE);
6664 6665 6666 6667 6668 6669
      }
    }
  }

  if (select_lex->order_list.elements)
    msg= "ORDER BY";
6670
  else if (select_lex->select_limit)
6671 6672 6673 6674
    msg= "LIMIT";
  if (msg)
  {
    my_error(ER_WRONG_USAGE, MYF(0), "UPDATE", msg);
6675
    DBUG_RETURN(TRUE);
6676
  }
6677
  DBUG_RETURN(FALSE);
6678 6679 6680 6681 6682 6683 6684
}

/*
  Multi delete query pre-check

  SYNOPSIS
    multi_delete_precheck()
6685
    thd			Thread handler
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VIEW  
bell@sanja.is.com.ua committed
6686
    tables		Global/local table list
6687

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6688
  RETURN VALUE
6689 6690
    FALSE OK
    TRUE  error
6691
*/
6692

6693
bool multi_delete_precheck(THD *thd, TABLE_LIST *tables)
6694 6695 6696
{
  SELECT_LEX *select_lex= &thd->lex->select_lex;
  TABLE_LIST *aux_tables=
6697
    (TABLE_LIST *)thd->lex->auxiliary_table_list.first;
6698
  TABLE_LIST **save_query_tables_own_last= thd->lex->query_tables_own_last;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
6699
  DBUG_ENTER("multi_delete_precheck");
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6700

6701 6702
  /* sql_yacc guarantees that tables and aux_tables are not zero */
  DBUG_ASSERT(aux_tables != 0);
6703
  if (check_table_access(thd, SELECT_ACL, tables, 0))
6704 6705 6706 6707 6708 6709 6710 6711 6712 6713 6714
    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;
6715
    DBUG_RETURN(TRUE);
6716 6717 6718
  }
  thd->lex->query_tables_own_last= save_query_tables_own_last;

6719 6720
  if ((thd->options & OPTION_SAFE_UPDATES) && !select_lex->where)
  {
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bell@sanja.is.com.ua committed
6721 6722
    my_message(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE,
               ER(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE), MYF(0));
6723
    DBUG_RETURN(TRUE);
6724
  }
6725 6726 6727 6728 6729 6730 6731 6732 6733 6734 6735 6736 6737 6738 6739 6740 6741 6742 6743 6744 6745 6746 6747 6748 6749
  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;

6750
  for (target_tbl= (TABLE_LIST *)lex->auxiliary_table_list.first;
6751
       target_tbl; target_tbl= target_tbl->next_local)
6752
  {
6753
    lex->table_count++;
6754 6755
    /* All tables in aux_tables must be found in FROM PART */
    TABLE_LIST *walk;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
6756
    for (walk= tables; walk; walk= walk->next_local)
6757
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6758 6759 6760
      if (!my_strcasecmp(table_alias_charset,
			 target_tbl->alias, walk->alias) &&
	  !strcmp(walk->db, target_tbl->db))
6761 6762 6763 6764
	break;
    }
    if (!walk)
    {
6765
      my_error(ER_UNKNOWN_TABLE, MYF(0),
6766
               target_tbl->table_name, "MULTI DELETE");
6767
      DBUG_RETURN(TRUE);
6768
    }
serg@serg.mylan's avatar
serg@serg.mylan committed
6769 6770 6771 6772 6773
    if (!walk->derived)
    {
      target_tbl->table_name= walk->table_name;
      target_tbl->table_name_length= walk->table_name_length;
    }
serg@serg.mylan's avatar
serg@serg.mylan committed
6774
    walk->updating= target_tbl->updating;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6775
    walk->lock_type= target_tbl->lock_type;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
6776
    target_tbl->correspondent_table= walk;	// Remember corresponding table
6777
  }
6778
  DBUG_RETURN(FALSE);
6779 6780 6781
}


bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6782 6783 6784 6785 6786
/*
  simple UPDATE query pre-check

  SYNOPSIS
    update_precheck()
6787 6788
    thd		Thread handler
    tables	Global table list
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6789 6790

  RETURN VALUE
6791 6792
    FALSE OK
    TRUE  Error
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6793
*/
6794

6795
bool update_precheck(THD *thd, TABLE_LIST *tables)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6796 6797 6798 6799
{
  DBUG_ENTER("update_precheck");
  if (thd->lex->select_lex.item_list.elements != thd->lex->value_list.elements)
  {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6800
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
6801
    DBUG_RETURN(TRUE);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6802
  }
6803
  DBUG_RETURN(check_one_table_access(thd, UPDATE_ACL, tables));
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6804 6805 6806 6807 6808 6809 6810 6811
}


/*
  simple DELETE query pre-check

  SYNOPSIS
    delete_precheck()
6812 6813
    thd		Thread handler
    tables	Global table list
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6814 6815

  RETURN VALUE
6816 6817
    FALSE  OK
    TRUE   error
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6818
*/
6819

6820
bool delete_precheck(THD *thd, TABLE_LIST *tables)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6821 6822 6823
{
  DBUG_ENTER("delete_precheck");
  if (check_one_table_access(thd, DELETE_ACL, tables))
6824
    DBUG_RETURN(TRUE);
6825
  /* Set privilege for the WHERE clause */
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6826
  tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
6827
  DBUG_RETURN(FALSE);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6828 6829 6830 6831 6832 6833 6834 6835
}


/*
  simple INSERT query pre-check

  SYNOPSIS
    insert_precheck()
6836 6837
    thd		Thread handler
    tables	Global table list
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6838 6839

  RETURN VALUE
6840 6841
    FALSE  OK
    TRUE   error
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6842
*/
6843

bell@sanja.is.com.ua's avatar
merge  
bell@sanja.is.com.ua committed
6844
bool insert_precheck(THD *thd, TABLE_LIST *tables)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6845 6846 6847 6848
{
  LEX *lex= thd->lex;
  DBUG_ENTER("insert_precheck");

6849 6850 6851 6852
  /*
    Check that we have modify privileges for the first table and
    select privileges for the rest
  */
monty@mysql.com's avatar
monty@mysql.com committed
6853 6854 6855
  ulong privilege= (INSERT_ACL |
                    (lex->duplicates == DUP_REPLACE ? DELETE_ACL : 0) |
                    (lex->value_list.elements ? UPDATE_ACL : 0));
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6856 6857

  if (check_one_table_access(thd, privilege, tables))
6858
    DBUG_RETURN(TRUE);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6859

6860
  if (lex->update_list.elements != lex->value_list.elements)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6861
  {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6862
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
6863
    DBUG_RETURN(TRUE);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6864
  }
6865
  DBUG_RETURN(FALSE);
6866
}
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6867 6868


6869 6870 6871 6872 6873 6874 6875 6876 6877 6878 6879 6880 6881 6882 6883
/**
    @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)) ||
6884
         check_grant(thd, SELECT_ACL, table, 2, UINT_MAX, 0);
6885 6886 6887
}


bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6888 6889 6890 6891 6892
/*
  CREATE TABLE query pre-check

  SYNOPSIS
    create_table_precheck()
6893 6894 6895
    thd			Thread handler
    tables		Global table list
    create_table	Table which will be created
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6896 6897

  RETURN VALUE
6898 6899
    FALSE   OK
    TRUE   Error
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6900
*/
6901

6902 6903
bool create_table_precheck(THD *thd, TABLE_LIST *tables,
                           TABLE_LIST *create_table)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6904 6905
{
  LEX *lex= thd->lex;
6906 6907
  SELECT_LEX *select_lex= &lex->select_lex;
  ulong want_priv;
bell@sanja.is.com.ua's avatar
merge  
bell@sanja.is.com.ua committed
6908
  bool error= TRUE;                                 // Error message is given
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6909
  DBUG_ENTER("create_table_precheck");
6910 6911 6912

  want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
              CREATE_TMP_ACL : CREATE_ACL);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6913
  if (check_access(thd, want_priv, create_table->db,
6914 6915
		   &create_table->grant.privilege, 0, 0,
                   test(create_table->schema_table)) ||
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6916 6917 6918
      check_merge_table_access(thd, create_table->db,
			       (TABLE_LIST *)
			       lex->create_info.merge_list.first))
6919
    goto err;
6920
  if (want_priv != CREATE_TMP_ACL &&
6921
      check_grant(thd, want_priv, create_table, 0, 1, 0))
6922 6923 6924 6925 6926 6927
    goto err;

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

6928 6929
#ifdef NOT_NECESSARY_TO_CHECK_CREATE_TABLE_EXIST_WHEN_PREPARING_STATEMENT
    /* This code throws an ill error for CREATE TABLE t1 SELECT * FROM t1 */
6930
    /*
6931
      Only do the check for PS, because we on execute we have to check that
monty@mysql.com's avatar
monty@mysql.com committed
6932 6933
      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).
6934
    */
konstantin@mysql.com's avatar
konstantin@mysql.com committed
6935
    if (thd->stmt_arena->is_stmt_prepare_or_first_sp_execute())
6936
    {
monty@mysql.com's avatar
monty@mysql.com committed
6937 6938 6939 6940
      /*
        For temporary tables we don't have to check if the created table exists
      */
      if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
monty@mysql.com's avatar
monty@mysql.com committed
6941
          find_table_in_global_list(tables, create_table->db,
6942
                                    create_table->table_name))
monty@mysql.com's avatar
monty@mysql.com committed
6943
      {
6944
	error= FALSE;
monty@mysql.com's avatar
monty@mysql.com committed
6945 6946 6947
        goto err;
      }
    }
6948
#endif
6949 6950 6951
    if (tables && check_table_access(thd, SELECT_ACL, tables,0))
      goto err;
  }
6952 6953 6954 6955 6956
  else if (lex->create_info.options & HA_LEX_CREATE_TABLE_LIKE)
  {
    if (check_show_create_table_access(thd, tables))
      goto err;
  }
bell@sanja.is.com.ua's avatar
merge  
bell@sanja.is.com.ua committed
6957
  error= FALSE;
6958 6959 6960

err:
  DBUG_RETURN(error);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6961
}
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6962 6963 6964 6965 6966 6967 6968


/*
  negate given expression

  SYNOPSIS
    negate_expression()
6969
    thd  thread handler
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6970 6971 6972 6973 6974 6975 6976 6977 6978 6979 6980 6981 6982 6983 6984 6985 6986 6987 6988 6989 6990 6991 6992 6993 6994 6995 6996 6997
    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);
}
6998

6999 7000
/*
  Set the specified definer to the default value, which is the current user in
7001
  the thread.
7002 7003 7004 7005 7006 7007 7008
 
  SYNOPSIS
    get_default_definer()
    thd       [in] thread handler
    definer   [out] definer
*/
 
7009
void get_default_definer(THD *thd, LEX_USER *definer)
7010 7011 7012 7013 7014 7015 7016 7017 7018 7019
{
  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);
}

7020

7021
/*
7022
  Create default definer for the specified THD.
7023 7024 7025 7026 7027 7028 7029 7030 7031 7032 7033 7034 7035 7036 7037 7038 7039 7040

  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;

7041
  get_default_definer(thd, definer);
7042 7043 7044 7045 7046

  return definer;
}


7047
/*
7048
  Create definer with the given user and host names.
7049 7050

  SYNOPSIS
7051 7052 7053 7054
    create_definer()
    thd         [in] thread handler
    user_name   [in] user name
    host_name   [in] host name
7055 7056

  RETURN
7057
    On success, return a valid pointer to the created and initialized
7058
    LEX_USER, which contains definer information.
7059
    On error, return 0.
7060 7061
*/

7062
LEX_USER *create_definer(THD *thd, LEX_STRING *user_name, LEX_STRING *host_name)
7063
{
7064 7065 7066 7067
  LEX_USER *definer;

  /* Create and initialize. */

7068
  if (! (definer= (LEX_USER*) thd->alloc(sizeof(LEX_USER))))
7069 7070 7071 7072 7073 7074
    return 0;

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

  return definer;
7075
}
7076 7077 7078 7079 7080 7081 7082 7083 7084 7085 7086 7087 7088 7089 7090 7091 7092 7093 7094


/*
  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
7095 7096
    return create_default_definer(thd);

7097 7098
  return user;
}
7099 7100 7101


/*
7102
  Check that byte length of a string does not exceed some limit.
7103 7104

  SYNOPSIS
7105 7106 7107 7108
  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
7109 7110 7111 7112

  RETURN
    FALSE   the passed string is not longer than max_length
    TRUE    the passed string is longer than max_length
7113 7114 7115

  NOTE
    The function is not used in existing code but can be useful later?
7116 7117
*/

7118 7119
bool check_string_byte_length(LEX_STRING *str, const char *err_msg,
                              uint max_byte_length)
7120
{
7121
  if (str->length <= max_byte_length)
7122
    return FALSE;
7123

7124 7125 7126 7127 7128 7129 7130 7131 7132 7133 7134 7135 7136 7137 7138 7139 7140 7141 7142 7143 7144 7145 7146 7147 7148 7149 7150 7151 7152 7153 7154 7155
  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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  if (!no_error)
    my_error(ER_WRONG_STRING_LENGTH, MYF(0), str->str, err_msg, max_char_length);
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  return TRUE;
}
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extern int MYSQLparse(void *thd); // from sql_yacc.cc


/**
  This is a wrapper of MYSQLparse(). All the code should call parse_sql()
  instead of MYSQLparse().

  @param thd Thread context.
  @param lip Lexer context.
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  @param creation_ctx Object creation context.
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  @return Error status.
    @retval FALSE on success.
    @retval TRUE on parsing error.
*/

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bool parse_sql(THD *thd,
               Lex_input_stream *lip,
               Object_creation_ctx *creation_ctx)
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{
  DBUG_ASSERT(thd->m_lip == NULL);

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  /* Backup creation context. */

  Object_creation_ctx *backup_ctx= NULL;

  if (creation_ctx)
    backup_ctx= creation_ctx->set_n_backup(thd);

  /* Set Lex_input_stream. */

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  thd->m_lip= lip;

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  /* Parse the query. */

  bool err_status= MYSQLparse(thd) != 0 || thd->is_fatal_error;

  /* Reset Lex_input_stream. */
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  thd->m_lip= NULL;

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  /* Restore creation context. */

  if (creation_ctx)
    creation_ctx->restore_env(thd, backup_ctx);

  /* That's it. */

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  return err_status;
}