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

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

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

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

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

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

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static char empty_c_string[1]= {0};		// Used for not defined 'db'
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#ifdef __WIN__
static void  test_signal(int sig_ptr)
{
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#if !defined( DBUG_OFF)
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  MessageBox(NULL,"Test signal","DBUG",MB_OK);
#endif
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#if defined(OS2)
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  fprintf(stderr, "Test signal %d\n", sig_ptr);
  fflush(stderr);
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#endif
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}
static void init_signals(void)
{
  int signals[7] = {SIGINT,SIGILL,SIGFPE,SIGSEGV,SIGTERM,SIGBREAK,SIGABRT } ;
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  for (int i=0 ; i < 7 ; i++)
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    signal( signals[i], test_signal) ;
}
#endif

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

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

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static bool begin_trans(THD *thd)
{
  int error=0;
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  if (unlikely(thd->in_sub_stmt))
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  {
    my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0));
    return 1;
  }
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  if (thd->locked_tables)
  {
    thd->lock=thd->locked_tables;
    thd->locked_tables=0;			// Will be automatically closed
    close_thread_tables(thd);			// Free tables
  }
  if (end_active_trans(thd))
    error= -1;
  else
  {
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    LEX *lex= thd->lex;
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    thd->options= ((thd->options & (ulong) ~(OPTION_STATUS_NO_TRANS_UPDATE)) |
		   OPTION_BEGIN);
    thd->server_status|= SERVER_STATUS_IN_TRANS;
    if (lex->start_transaction_opt & MYSQL_START_TRANS_OPT_WITH_CONS_SNAPSHOT)
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      error= ha_start_consistent_snapshot(thd);
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  }
  return error;
}
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#ifdef HAVE_REPLICATION
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inline bool all_tables_not_ok(THD *thd, TABLE_LIST *tables)
{
  return (table_rules_on && tables && !tables_ok(thd,tables) &&
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          ((thd->lex->sql_command != SQLCOM_DELETE_MULTI) ||
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           !tables_ok(thd,
		      (TABLE_LIST *)thd->lex->auxilliary_table_list.first)));
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}
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#endif
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static HASH hash_user_connections;

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static int get_or_create_user_conn(THD *thd, const char *user,
				   const char *host,
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				   USER_RESOURCES *mqh)
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{
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  int return_val= 0;
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  uint temp_len, user_len;
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  char temp_user[USERNAME_LENGTH+HOSTNAME_LENGTH+2];
  struct  user_conn *uc;

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

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  user_len= strlen(user);
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  temp_len= (strmov(strmov(temp_user, user)+1, host) - temp_user)+1;
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  (void) pthread_mutex_lock(&LOCK_user_conn);
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  if (!(uc = (struct  user_conn *) hash_search(&hash_user_connections,
					       (byte*) temp_user, temp_len)))
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  {
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    /* First connection for user; Create a user connection object */
    if (!(uc= ((struct user_conn*)
	       my_malloc(sizeof(struct user_conn) + temp_len+1,
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			 MYF(MY_WME)))))
    {
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      net_send_error(thd, 0, NullS);		// Out of memory
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      return_val= 1;
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      goto end;
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    }
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    uc->user=(char*) (uc+1);
    memcpy(uc->user,temp_user,temp_len+1);
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    uc->host= uc->user + user_len +  1;
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    uc->len= temp_len;
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    uc->connections= uc->questions= uc->updates= uc->conn_per_hour= 0;
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    uc->user_resources= *mqh;
    uc->intime= thd->thr_create_time;
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    if (my_hash_insert(&hash_user_connections, (byte*) uc))
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    {
      my_free((char*) uc,0);
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      net_send_error(thd, 0, NullS);		// Out of memory
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      return_val= 1;
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      goto end;
    }
  }
  thd->user_connect=uc;
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  uc->connections++;
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end:
  (void) pthread_mutex_unlock(&LOCK_user_conn);
  return return_val;
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}
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/*
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    Check if user exist and password supplied is correct. 
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  SYNOPSIS
    check_user()
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    thd          thread handle, thd->{host,user,ip} are used
    command      originator of the check: now check_user is called
                 during connect and change user procedures; used for 
                 logging.
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    passwd       scrambled password received from client
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    passwd_len   length of scrambled password
    db           database name to connect to, may be NULL
    check_count  dont know exactly

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

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

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int check_user(THD *thd, enum enum_server_command command, 
	       const char *passwd, uint passwd_len, const char *db,
	       bool check_count)
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{
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  DBUG_ENTER("check_user");
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#ifdef NO_EMBEDDED_ACCESS_CHECKS
  thd->master_access= GLOBAL_ACLS;			// Full rights
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  /* Change database if necessary */
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  if (db && db[0])
  {
    thd->db= 0;
    thd->db_length= 0;
    if (mysql_change_db(thd, db))
    {
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      /* Send the error to the client */
      net_send_error(thd);
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      if (thd->user_connect)
	decrease_user_connections(thd->user_connect);
      DBUG_RETURN(-1);
    }
  }
  else
    send_ok(thd);
  DBUG_RETURN(0);
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#else

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  my_bool opt_secure_auth_local;
  pthread_mutex_lock(&LOCK_global_system_variables);
  opt_secure_auth_local= opt_secure_auth;
  pthread_mutex_unlock(&LOCK_global_system_variables);
  
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  /*
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    If the server is running in secure auth mode, short scrambles are 
    forbidden.
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  */
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  if (opt_secure_auth_local && passwd_len == SCRAMBLE_LENGTH_323)
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  {
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    net_printf_error(thd, ER_NOT_SUPPORTED_AUTH_MODE);
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    mysql_log.write(thd, COM_CONNECT, ER(ER_NOT_SUPPORTED_AUTH_MODE));
    DBUG_RETURN(-1);
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  }
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  if (passwd_len != 0 &&
      passwd_len != SCRAMBLE_LENGTH &&
      passwd_len != SCRAMBLE_LENGTH_323)
    DBUG_RETURN(ER_HANDSHAKE_ERROR);
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  /*
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    Clear thd->db as it points to something, that will be freed when 
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    connection is closed. We don't want to accidentally free a wrong pointer
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    if connect failed. Also in case of 'CHANGE USER' failure, current
    database will be switched to 'no database selected'.
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  */
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  thd->db= 0;
  thd->db_length= 0;
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  USER_RESOURCES ur;
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  int res= acl_getroot(thd, &ur, passwd, passwd_len);
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#ifndef EMBEDDED_LIBRARY
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  if (res == -1)
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  {
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    /*
      This happens when client (new) sends password scrambled with
      scramble(), but database holds old value (scrambled with
      scramble_323()). Here we please client to send scrambled_password
      in old format.
    */
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    NET *net= &thd->net;
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    if (opt_secure_auth_local)
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    {
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      net_printf_error(thd, ER_SERVER_IS_IN_SECURE_AUTH_MODE,
                       thd->user, thd->host_or_ip);
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      mysql_log.write(thd, COM_CONNECT, ER(ER_SERVER_IS_IN_SECURE_AUTH_MODE),
                      thd->user, thd->host_or_ip);
      DBUG_RETURN(-1);
    }
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    /* We have to read very specific packet size */
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    if (send_old_password_request(thd) ||
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        my_net_read(net) != SCRAMBLE_LENGTH_323 + 1)
    {                                               
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      inc_host_errors(&thd->remote.sin_addr);
      DBUG_RETURN(ER_HANDSHAKE_ERROR);
    }
    /* Final attempt to check the user based on reply */
    /* So as passwd is short, errcode is always >= 0 */
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    res= acl_getroot(thd, &ur, (char *) net->read_pos, SCRAMBLE_LENGTH_323);
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  }
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#endif /*EMBEDDED_LIBRARY*/
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  /* here res is always >= 0 */
  if (res == 0)
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  {
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    if (!(thd->master_access & NO_ACCESS)) // authentication is OK 
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    {
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      DBUG_PRINT("info",
                 ("Capabilities: %d  packet_length: %ld  Host: '%s'  "
                  "Login user: '%s' Priv_user: '%s'  Using password: %s "
                  "Access: %u  db: '%s'",
                  thd->client_capabilities, thd->max_client_packet_length,
                  thd->host_or_ip, thd->user, thd->priv_user,
                  passwd_len ? "yes": "no",
                  thd->master_access, thd->db ? thd->db : "*none*"));

      if (check_count)
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      {
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        VOID(pthread_mutex_lock(&LOCK_thread_count));
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        bool count_ok= thread_count <= max_connections + delayed_insert_threads
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                       || (thd->master_access & SUPER_ACL);
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        VOID(pthread_mutex_unlock(&LOCK_thread_count));
        if (!count_ok)
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        {                                         // too many connections
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          net_send_error(thd, ER_CON_COUNT_ERROR);
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          DBUG_RETURN(-1);
        }
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      }
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      /* Why logging is performed before all checks've passed? */
      mysql_log.write(thd,command,
                      (thd->priv_user == thd->user ?
                       (char*) "%s@%s on %s" :
                       (char*) "%s@%s as anonymous on %s"),
                      thd->user, thd->host_or_ip,
                      db ? db : (char*) "");

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      /*
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        This is the default access rights for the current database.  It's
        set to 0 here because we don't have an active database yet (and we
        may not have an active database to set.
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      */
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      thd->db_access=0;

      /* Don't allow user to connect if he has done too many queries */
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      if ((ur.questions || ur.updates || ur.conn_per_hour || ur.user_conn ||
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	   max_user_connections) &&
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	  get_or_create_user_conn(thd,
            opt_old_style_user_limits ? thd->user : thd->priv_user,
            opt_old_style_user_limits ? thd->host_or_ip : thd->priv_host,
            &ur))
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	DBUG_RETURN(-1);
      if (thd->user_connect &&
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	  (thd->user_connect->user_resources.conn_per_hour ||
	   thd->user_connect->user_resources.user_conn ||
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	   max_user_connections) &&
	  check_for_max_user_connections(thd, thd->user_connect))
	DBUG_RETURN(-1);
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      /* Change database if necessary */
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      if (db && db[0])
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      {
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        if (mysql_change_db(thd, db))
        {
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          /* Send error to the client */
          net_send_error(thd);
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          if (thd->user_connect)
            decrease_user_connections(thd->user_connect);
          DBUG_RETURN(-1);
        }
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      }
      else
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	send_ok(thd);
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      thd->password= test(passwd_len);          // remember for error messages 
      /* Ready to handle queries */
      DBUG_RETURN(0);
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    }
  }
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  else if (res == 2) // client gave short hash, server has long hash
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  {
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    net_printf_error(thd, ER_NOT_SUPPORTED_AUTH_MODE);
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    mysql_log.write(thd,COM_CONNECT,ER(ER_NOT_SUPPORTED_AUTH_MODE));
    DBUG_RETURN(-1);
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  }
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  net_printf_error(thd, ER_ACCESS_DENIED_ERROR,
                   thd->user,
                   thd->host_or_ip,
                   passwd_len ? ER(ER_YES) : ER(ER_NO));
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  mysql_log.write(thd, COM_CONNECT, ER(ER_ACCESS_DENIED_ERROR),
                  thd->user,
                  thd->host_or_ip,
                  passwd_len ? ER(ER_YES) : ER(ER_NO));
  DBUG_RETURN(-1);
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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}

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

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

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

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


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

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

  RETURN
    0	ok
    1	error
*/

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#ifndef NO_EMBEDDED_ACCESS_CHECKS

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static int check_for_max_user_connections(THD *thd, USER_CONN *uc)
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{
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  int error=0;
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  DBUG_ENTER("check_for_max_user_connections");
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  (void) pthread_mutex_lock(&LOCK_user_conn);
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  if (max_user_connections && !uc->user_resources.user_conn &&
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      max_user_connections < (uint) uc->connections)
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  {
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    net_printf_error(thd, ER_TOO_MANY_USER_CONNECTIONS, uc->user);
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    error=1;
    goto end;
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  }
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  time_out_user_resource_limits(thd, uc);
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  if (uc->user_resources.user_conn &&
      uc->user_resources.user_conn < uc->connections)
  {
    net_printf_error(thd, ER_USER_LIMIT_REACHED, uc->user,
                     "max_user_connections",
                     (long) uc->user_resources.user_conn);
    error= 1;
    goto end;
  }
  if (uc->user_resources.conn_per_hour &&
      uc->user_resources.conn_per_hour <= uc->conn_per_hour)
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  {
518
    net_printf_error(thd, ER_USER_LIMIT_REACHED, uc->user,
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                     "max_connections_per_hour",
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                     (long) uc->user_resources.conn_per_hour);
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    error=1;
    goto end;
  }
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  uc->conn_per_hour++;
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  end:
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  if (error)
    uc->connections--; // no need for decrease_user_connections() here
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  (void) pthread_mutex_unlock(&LOCK_user_conn);
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  DBUG_RETURN(error);
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}
532
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
533

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/*
  Decrease user connection count

  SYNOPSIS
    decrease_user_connections()
    uc			User connection object

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

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

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static void decrease_user_connections(USER_CONN *uc)
553
{
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  DBUG_ENTER("decrease_user_connections");
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  (void) pthread_mutex_lock(&LOCK_user_conn);
  DBUG_ASSERT(uc->connections);
  if (!--uc->connections && !mqh_used)
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  {
    /* Last connection for user; Delete it */
560
    (void) hash_delete(&hash_user_connections,(byte*) uc);
561
  }
562
  (void) pthread_mutex_unlock(&LOCK_user_conn);
563
  DBUG_VOID_RETURN;
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}

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void free_max_user_conn(void)
{
  hash_free(&hash_user_connections);
}

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

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

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

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bool is_update_query(enum enum_sql_command command)
{
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  DBUG_ASSERT(command >= 0 && command <= SQLCOM_END);
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  return uc_update_queries[command];
}
622

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623
/*
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  Reset per-hour user resource limits when it has been more than
  an hour since they were last checked
626

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  SYNOPSIS:
    time_out_user_resource_limits()
    thd			Thread handler
    uc			User connection details
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  NOTE:
    This assumes that the LOCK_user_conn mutex has been acquired, so it is
    safe to test and modify members of the USER_CONN structure.
*/
636

637
static void time_out_user_resource_limits(THD *thd, USER_CONN *uc)
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{
639
  time_t check_time = thd->start_time ?  thd->start_time : time(NULL);
640
  DBUG_ENTER("time_out_user_resource_limits");
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642
  /* If more than a hour since last check, reset resource checking */
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  if (check_time  - uc->intime >= 3600)
  {
    uc->questions=1;
    uc->updates=0;
    uc->conn_per_hour=0;
    uc->intime=check_time;
  }
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  DBUG_VOID_RETURN;
}


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

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

  (void) pthread_mutex_lock(&LOCK_user_conn);

  time_out_user_resource_limits(thd, uc);

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  /* Check that we have not done too many questions / hour */
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  if (uc->user_resources.questions &&
      uc->questions++ >= uc->user_resources.questions)
  {
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    net_printf_error(thd, ER_USER_LIMIT_REACHED, uc->user, "max_questions",
                     (long) uc->user_resources.questions);
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    error=1;
    goto end;
  }
681
  if (check_command < (uint) SQLCOM_END)
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  {
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    /* Check that we have not done too many updates / hour */
    if (uc->user_resources.updates && uc_update_queries[check_command] &&
	uc->updates++ >= uc->user_resources.updates)
    {
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      net_printf_error(thd, ER_USER_LIMIT_REACHED, uc->user, "max_updates",
                       (long) uc->user_resources.updates);
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      error=1;
      goto end;
    }
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  }
end:
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  (void) pthread_mutex_unlock(&LOCK_user_conn);
695
  DBUG_RETURN(error);
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#else
  return (0);
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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}

701

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static void reset_mqh(LEX_USER *lu, bool get_them= 0)
703
{
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  (void) pthread_mutex_lock(&LOCK_user_conn);
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  if (lu)  // for GRANT
707
  {
708
    USER_CONN *uc;
709
    uint temp_len=lu->user.length+lu->host.length+2;
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    char temp_user[USERNAME_LENGTH+HOSTNAME_LENGTH+2];

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    memcpy(temp_user,lu->user.str,lu->user.length);
    memcpy(temp_user+lu->user.length+1,lu->host.str,lu->host.length);
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    temp_user[lu->user.length]='\0'; temp_user[temp_len-1]=0;
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    if ((uc = (struct  user_conn *) hash_search(&hash_user_connections,
716
						(byte*) temp_user, temp_len)))
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    {
      uc->questions=0;
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      get_mqh(temp_user,&temp_user[lu->user.length+1],uc);
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      uc->updates=0;
      uc->conn_per_hour=0;
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    }
  }
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  else
725
  {
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    /* for FLUSH PRIVILEGES and FLUSH USER_RESOURCES */
727
    for (uint idx=0;idx < hash_user_connections.records; idx++)
728
    {
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      USER_CONN *uc=(struct user_conn *) hash_element(&hash_user_connections,
						      idx);
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      if (get_them)
	get_mqh(uc->user,uc->host,uc);
      uc->questions=0;
      uc->updates=0;
      uc->conn_per_hour=0;
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    }
  }
738
  (void) pthread_mutex_unlock(&LOCK_user_conn);
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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}
741

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/*
743
    Perform handshake, authorize client and update thd ACL variables.
744
  SYNOPSIS
745
    check_connection()
746
    thd  thread handle
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  RETURN
749
     0  success, OK is sent to user, thd is updated.
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    -1  error, which is sent to user
   > 0  error code (not sent to user)
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*/

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#ifndef EMBEDDED_LIBRARY
static int check_connection(THD *thd)
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{
757
  uint connect_errors= 0;
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  NET *net= &thd->net;
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  ulong pkt_len= 0;
  char *end;
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  DBUG_PRINT("info",
             ("New connection received on %s", vio_description(net->vio)));

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  if (!thd->host)                           // If TCP/IP connection
  {
767
    char ip[30];
768

769
    if (vio_peer_addr(net->vio, ip, &thd->peer_port))
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      return (ER_BAD_HOST_ERROR);
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    if (!(thd->ip= my_strdup(ip,MYF(0))))
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      return (ER_OUT_OF_RESOURCES);
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    thd->host_or_ip= thd->ip;
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    vio_in_addr(net->vio,&thd->remote.sin_addr);
775
    if (!(specialflag & SPECIAL_NO_RESOLVE))
776
    {
777 778 779 780
      vio_in_addr(net->vio,&thd->remote.sin_addr);
      thd->host=ip_to_hostname(&thd->remote.sin_addr,&connect_errors);
      /* Cut very long hostnames to avoid possible overflows */
      if (thd->host)
781
      {
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        if (thd->host != my_localhost)
          thd->host[min(strlen(thd->host), HOSTNAME_LENGTH)]= 0;
        thd->host_or_ip= thd->host;
785
      }
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      if (connect_errors > max_connect_errors)
        return(ER_HOST_IS_BLOCKED);
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    }
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    DBUG_PRINT("info",("Host: %s  ip: %s",
		       thd->host ? thd->host : "unknown host",
		       thd->ip ? thd->ip : "unknown ip"));
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    if (acl_check_host(thd->host,thd->ip))
      return(ER_HOST_NOT_PRIVILEGED);
  }
795
  else /* Hostname given means that the connection was on a socket */
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  {
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    DBUG_PRINT("info",("Host: %s",thd->host));
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    thd->host_or_ip= thd->host;
    thd->ip= 0;
800 801
    /* Reset sin_addr */
    bzero((char*) &thd->remote, sizeof(thd->remote));
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  }
  vio_keepalive(net->vio, TRUE);
  {
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805
    /* buff[] needs to big enough to hold the server_version variable */
806
    char buff[SERVER_VERSION_LENGTH + SCRAMBLE_LENGTH + 64];
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    ulong client_flags = (CLIENT_LONG_FLAG | CLIENT_CONNECT_WITH_DB |
			  CLIENT_PROTOCOL_41 | CLIENT_SECURE_CONNECTION);
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    if (opt_using_transactions)
      client_flags|=CLIENT_TRANSACTIONS;
#ifdef HAVE_COMPRESS
    client_flags |= CLIENT_COMPRESS;
#endif /* HAVE_COMPRESS */
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#ifdef HAVE_OPENSSL
    if (ssl_acceptor_fd)
817
      client_flags |= CLIENT_SSL;       /* Wow, SSL is available! */
818
#endif /* HAVE_OPENSSL */
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    end= strnmov(buff, server_version, SERVER_VERSION_LENGTH) + 1;
    int4store((uchar*) end, thd->thread_id);
    end+= 4;
    /*
      So as check_connection is the only entry point to authorization
      procedure, scramble is set here. This gives us new scramble for
      each handshake.
    */
    create_random_string(thd->scramble, SCRAMBLE_LENGTH, &thd->rand);
    /*
      Old clients does not understand long scrambles, but can ignore packet
831
      tail: that's why first part of the scramble is placed here, and second
832 833
      part at the end of packet.
    */
834
    end= strmake(end, thd->scramble, SCRAMBLE_LENGTH_323) + 1;
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    int2store(end, client_flags);
    /* write server characteristics: up to 16 bytes allowed */
838
    end[2]=(char) default_charset_info->number;
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    int2store(end+3, thd->server_status);
    bzero(end+5, 13);
    end+= 18;
    /* write scramble tail */
    end= strmake(end, thd->scramble + SCRAMBLE_LENGTH_323, 
                 SCRAMBLE_LENGTH - SCRAMBLE_LENGTH_323) + 1;

    /* At this point we write connection message and read reply */
    if (net_write_command(net, (uchar) protocol_version, "", 0, buff,
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848
			  (uint) (end-buff)) ||
849
	(pkt_len= my_net_read(net)) == packet_error ||
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	pkt_len < MIN_HANDSHAKE_SIZE)
    {
      inc_host_errors(&thd->remote.sin_addr);
      return(ER_HANDSHAKE_ERROR);
    }
  }
#ifdef _CUSTOMCONFIG_
#include "_cust_sql_parse.h"
#endif
  if (connect_errors)
    reset_host_errors(&thd->remote.sin_addr);
861
  if (thd->packet.alloc(thd->variables.net_buffer_length))
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    return(ER_OUT_OF_RESOURCES);

  thd->client_capabilities=uint2korr(net->read_pos);
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  if (thd->client_capabilities & CLIENT_PROTOCOL_41)
  {
    thd->client_capabilities|= ((ulong) uint2korr(net->read_pos+2)) << 16;
    thd->max_client_packet_length= uint4korr(net->read_pos+4);
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    DBUG_PRINT("info", ("client_character_set: %d", (uint) net->read_pos[8]));
    /*
      Use server character set and collation if
      - client has not specified a character set
      - client character set is the same as the servers
      - client character set doesn't exists in server
    */
876
    if (!(thd->variables.character_set_client=
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	  get_charset((uint) net->read_pos[8], MYF(0))) ||
	!my_strcasecmp(&my_charset_latin1,
		       global_system_variables.character_set_client->name,
		       thd->variables.character_set_client->name))
881
    {
882 883
      thd->variables.character_set_client=
	global_system_variables.character_set_client;
884 885
      thd->variables.collation_connection=
	global_system_variables.collation_connection;
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      thd->variables.character_set_results=
	global_system_variables.character_set_results;
888 889 890
    }
    else
    {
891
      thd->variables.character_set_results=
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      thd->variables.collation_connection= 
	thd->variables.character_set_client;
    }
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    thd->update_charset();
896
    end= (char*) net->read_pos+32;
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  }
  else
  {
    thd->max_client_packet_length= uint3korr(net->read_pos+2);
    end= (char*) net->read_pos+5;
  }

904
  if (thd->client_capabilities & CLIENT_IGNORE_SPACE)
905
    thd->variables.sql_mode|= MODE_IGNORE_SPACE;
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#ifdef HAVE_OPENSSL
907
  DBUG_PRINT("info", ("client capabilities: %d", thd->client_capabilities));
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  if (thd->client_capabilities & CLIENT_SSL)
  {
    /* Do the SSL layering. */
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    if (!ssl_acceptor_fd)
    {
      inc_host_errors(&thd->remote.sin_addr);
      return(ER_HANDSHAKE_ERROR);
    }
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    DBUG_PRINT("info", ("IO layer change in progress..."));
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    if (sslaccept(ssl_acceptor_fd, net->vio, thd->variables.net_wait_timeout))
    {
      DBUG_PRINT("error", ("Failed to read user information (pkt_len= %lu)",
			   pkt_len));
      inc_host_errors(&thd->remote.sin_addr);
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      return(ER_HANDSHAKE_ERROR);
923
    }
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    DBUG_PRINT("info", ("Reading user information over SSL layer"));
925
    if ((pkt_len= my_net_read(net)) == packet_error ||
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	pkt_len < NORMAL_HANDSHAKE_SIZE)
    {
928 929
      DBUG_PRINT("error", ("Failed to read user information (pkt_len= %lu)",
			   pkt_len));
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      inc_host_errors(&thd->remote.sin_addr);
      return(ER_HANDSHAKE_ERROR);
    }
  }
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#endif

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

  if (thd->client_capabilities & CLIENT_INTERACTIVE)
943
    thd->variables.net_wait_timeout= thd->variables.net_interactive_timeout;
944
  if ((thd->client_capabilities & CLIENT_TRANSACTIONS) &&
945 946
      opt_using_transactions)
    net->return_status= &thd->server_status;
947
  net->read_timeout=(uint) thd->variables.net_read_timeout;
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949 950
  char *user= end;
  char *passwd= strend(user)+1;
951
  char *db= passwd;
952
  char db_buff[NAME_LEN+1];                     // buffer to store db in utf8
953
  char user_buff[USERNAME_LENGTH+1];		// buffer to store user in utf8
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  uint dummy_errors;

  /*
957 958 959 960
    Old clients send null-terminated string as password; new clients send
    the size (1 byte) + string (not null-terminated). Hence in case of empty
    password both send '\0'.
  */
961
  uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ?
962 963 964
    *passwd++ : strlen(passwd);
  db= thd->client_capabilities & CLIENT_CONNECT_WITH_DB ?
    db + passwd_len + 1 : 0;
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  /* Since 4.1 all database names are stored in utf8 */
  if (db)
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  {
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    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
                             system_charset_info,
                             db, strlen(db),
972
                             thd->charset(), &dummy_errors)]= 0;
973
    db= db_buff;
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  }
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976 977 978 979
  user_buff[copy_and_convert(user_buff, sizeof(user_buff)-1,
                             system_charset_info, user, strlen(user),
                             thd->charset(), &dummy_errors)]= '\0';
  user= user_buff;
980

981 982
  if (thd->user)
    x_free(thd->user);
983 984
  if (!(thd->user= my_strdup(user, MYF(0))))
    return (ER_OUT_OF_RESOURCES);
985
  return check_user(thd, COM_CONNECT, passwd, passwd_len, db, TRUE);
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986 987
}

988

989 990
void execute_init_command(THD *thd, sys_var_str *init_command_var,
			  rw_lock_t *var_mutex)
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991 992 993 994
{
  Vio* save_vio;
  ulong save_client_capabilities;

995 996 997 998 999 1000 1001 1002 1003
  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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1004 1005
  save_client_capabilities= thd->client_capabilities;
  thd->client_capabilities|= CLIENT_MULTI_QUERIES;
1006 1007 1008 1009
  /*
    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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1010 1011
  save_vio= thd->net.vio;
  thd->net.vio= 0;
1012
  thd->net.no_send_error= 0;
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1013
  dispatch_command(COM_QUERY, thd, thd->query, thd->query_length+1);
1014
  rw_unlock(var_mutex);
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1015 1016 1017 1018 1019
  thd->client_capabilities= save_client_capabilities;
  thd->net.vio= save_vio;
}


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1020 1021 1022 1023
pthread_handler_decl(handle_one_connection,arg)
{
  THD *thd=(THD*) arg;
  uint launch_time  =
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1024
    (uint) ((thd->thr_create_time = time(NULL)) - thd->connect_time);
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1025 1026 1027 1028 1029
  if (launch_time >= slow_launch_time)
    statistic_increment(slow_launch_threads,&LOCK_status );

  pthread_detach_this_thread();

1030
#if !defined( __WIN__) && !defined(OS2)	// Win32 calls this in pthread_create
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1031
  /* The following calls needs to be done before we call DBUG_ macros */
1032
  if (!(test_flags & TEST_NO_THREADS) & my_thread_init())
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1033
  {
1034
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
1035
    statistic_increment(aborted_connects,&LOCK_status);
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1036 1037 1038 1039 1040
    end_thread(thd,0);
    return 0;
  }
#endif

1041 1042 1043 1044 1045 1046 1047
  /*
    handle_one_connection() is the only way a thread would start
    and would always be on top of the stack, therefore, the thread
    stack always starts at the address of the first local variable
    of handle_one_connection, which is thd. We need to know the
    start of the stack so that we could check for stack overruns.
  */
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1048 1049
  DBUG_PRINT("info", ("handle_one_connection called by thread %d\n",
		      thd->thread_id));
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1050
  /* now that we've called my_thread_init(), it is safe to call DBUG_* */
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1051

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1052
#if defined(__WIN__)
1053
  init_signals();
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1054
#elif !defined(OS2) && !defined(__NETWARE__)
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1055 1056 1057 1058 1059 1060
  sigset_t set;
  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
#endif
  if (thd->store_globals())
  {
1061
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
1062
    statistic_increment(aborted_connects,&LOCK_status);
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1063 1064 1065 1066 1067 1068 1069 1070 1071
    end_thread(thd,0);
    return 0;
  }

  do
  {
    int error;
    NET *net= &thd->net;
    thd->thread_stack= (char*) &thd;
1072
    net->no_send_error= 0;
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1073

1074
    if ((error=check_connection(thd)))
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1075 1076
    {						// Wrong permissions
      if (error > 0)
1077
	net_printf_error(thd, error, thd->host_or_ip);
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1078 1079
#ifdef __NT__
      if (vio_type(net->vio) == VIO_TYPE_NAMEDPIPE)
1080
	my_sleep(1000);				/* must wait after eof() */
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1081
#endif
1082
      statistic_increment(aborted_connects,&LOCK_status);
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1083 1084
      goto end_thread;
    }
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1085 1086 1087
#ifdef __NETWARE__
    netware_reg_user(thd->ip, thd->user, "MySQL");
#endif
1088
    if (thd->variables.max_join_size == HA_POS_ERROR)
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1089 1090 1091 1092
      thd->options |= OPTION_BIG_SELECTS;
    if (thd->client_capabilities & CLIENT_COMPRESS)
      net->compress=1;				// Use compression

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1093
    thd->version= refresh_version;
1094
    thd->proc_info= 0;
1095
    thd->command= COM_SLEEP;
1096 1097
    thd->set_time();
    thd->init_for_queries();
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1098

1099
    if (sys_init_connect.value_length && !(thd->master_access & SUPER_ACL))
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1100
    {
1101 1102
      execute_init_command(thd, &sys_init_connect, &LOCK_sys_init_connect);
      if (thd->query_error)
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1103
	thd->killed= THD::KILL_CONNECTION;
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1104 1105 1106
    }

    thd->proc_info=0;
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1107
    thd->set_time();
1108
    thd->init_for_queries();
1109 1110
    while (!net->error && net->vio != 0 &&
           !(thd->killed == THD::KILL_CONNECTION))
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1111
    {
1112
      net->no_send_error= 0;
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1113 1114 1115
      if (do_command(thd))
	break;
    }
1116 1117
    if (thd->user_connect)
      decrease_user_connections(thd->user_connect);
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1118
    if (net->error && net->vio != 0 && net->report_error)
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1119
    {
1120
      if (!thd->killed && thd->variables.log_warnings > 1)
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1121
	sql_print_warning(ER(ER_NEW_ABORTING_CONNECTION),
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1122 1123 1124 1125 1126
                          thd->thread_id,(thd->db ? thd->db : "unconnected"),
                          thd->user ? thd->user : "unauthenticated",
                          thd->host_or_ip,
                          (net->last_errno ? ER(net->last_errno) :
                           ER(ER_UNKNOWN_ERROR)));
1127
      net_send_error(thd, net->last_errno, NullS);
1128
      statistic_increment(aborted_threads,&LOCK_status);
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1129
    }
1130 1131 1132 1133
    else if (thd->killed)
    {
      statistic_increment(aborted_threads,&LOCK_status);
    }
1134
    
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1135
end_thread:
1136
    close_connection(thd, 0, 1);
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1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147
    end_thread(thd,1);
    /*
      If end_thread returns, we are either running with --one-thread
      or this thread has been schedule to handle the next query
    */
    thd= current_thd;
  } while (!(test_flags & TEST_NO_THREADS));
  /* The following is only executed if we are not using --one-thread */
  return(0);					/* purecov: deadcode */
}

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1148 1149
#endif /* EMBEDDED_LIBRARY */

1150 1151 1152 1153
/*
  Execute commands from bootstrap_file.
  Used when creating the initial grant tables
*/
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1154

1155
extern "C" pthread_handler_decl(handle_bootstrap,arg)
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1156
{
1157 1158 1159
  THD *thd=(THD*) arg;
  FILE *file=bootstrap_file;
  char *buff;
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1160

1161
  /* The following must be called before DBUG_ENTER */
1162
  if (my_thread_init() || thd->store_globals())
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1163
  {
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1164
#ifndef EMBEDDED_LIBRARY
1165
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
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1166
#endif
1167
    thd->fatal_error();
1168
    goto end;
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1169
  }
1170 1171
  DBUG_ENTER("handle_bootstrap");

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1172
#ifndef EMBEDDED_LIBRARY
1173 1174
  pthread_detach_this_thread();
  thd->thread_stack= (char*) &thd;
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1175
#if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__)
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1176
  sigset_t set;
1177 1178
  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
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1179
#endif
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1180
#endif /* EMBEDDED_LIBRARY */
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1181

1182
  if (thd->variables.max_join_size == HA_POS_ERROR)
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1183 1184 1185 1186
    thd->options |= OPTION_BIG_SELECTS;

  thd->proc_info=0;
  thd->version=refresh_version;
1187
  thd->priv_user=thd->user=(char*) my_strdup("boot", MYF(MY_WME));
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1188

1189
  buff= (char*) thd->net.buff;
1190
  thd->init_for_queries();
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1191 1192
  while (fgets(buff, thd->net.max_packet, file))
  {
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1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212
   ulong length= (ulong) strlen(buff);
   while (buff[length-1] != '\n' && !feof(file))
   {
     /*
       We got only a part of the current string. Will try to increase
       net buffer then read the rest of the current string.
     */
     if (net_realloc(&(thd->net), 2 * thd->net.max_packet))
     {
       net_send_error(thd, ER_NET_PACKET_TOO_LARGE, NullS);
       thd->fatal_error();
       break;
     }
     buff= (char*) thd->net.buff;
     fgets(buff + length, thd->net.max_packet - length, file);
     length+= (ulong) strlen(buff + length);
   }
   if (thd->is_fatal_error)
     break;

1213
    while (length && (my_isspace(thd->charset(), buff[length-1]) ||
1214
           buff[length-1] == ';'))
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1215 1216
      length--;
    buff[length]=0;
1217
    thd->query_length=length;
1218 1219
    thd->query= thd->memdup_w_gap(buff, length+1, thd->db_length+1);
    thd->query[length] = '\0';
1220 1221 1222 1223
    /*
      We don't need to obtain LOCK_thread_count here because in bootstrap
      mode we have only one thread.
    */
1224
    thd->query_id=next_query_id();
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1225 1226
    mysql_parse(thd,thd->query,length);
    close_thread_tables(thd);			// Free tables
1227
    if (thd->is_fatal_error)
1228
      break;
1229
    free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));
1230
#ifdef USING_TRANSACTIONS
1231
    free_root(&thd->transaction.mem_root,MYF(MY_KEEP_PREALLOC));
1232
#endif
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1233
  }
1234 1235 1236

  /* thd->fatal_error should be set in case something went wrong */
end:
1237 1238 1239 1240 1241 1242
  bootstrap_error= thd->is_fatal_error;

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

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1243
#ifndef EMBEDDED_LIBRARY
1244 1245 1246
  (void) pthread_mutex_lock(&LOCK_thread_count);
  thread_count--;
  (void) pthread_mutex_unlock(&LOCK_thread_count);
1247
  (void) pthread_cond_broadcast(&COND_thread_count);
1248 1249
  my_thread_end();
  pthread_exit(0);
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1250
#endif
1251
  DBUG_RETURN(0);
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1252 1253
}

1254
    /* This works because items are allocated with sql_alloc() */
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1255

1256
void free_items(Item *item)
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1257
{
1258
  Item *next;
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1259
  DBUG_ENTER("free_items");
1260 1261 1262
  for (; item ; item=next)
  {
    next=item->next;
1263
    item->delete_self();
1264
  }
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1265
  DBUG_VOID_RETURN;
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1266 1267
}

1268 1269 1270 1271
    /* This works because items are allocated with sql_alloc() */

void cleanup_items(Item *item)
{
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1272
  DBUG_ENTER("cleanup_items");  
1273 1274
  for (; item ; item=item->next)
    item->cleanup();
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1275
  DBUG_VOID_RETURN;
1276 1277
}

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1278 1279 1280 1281 1282 1283 1284
int mysql_table_dump(THD* thd, char* db, char* tbl_name, int fd)
{
  TABLE* table;
  TABLE_LIST* table_list;
  int error = 0;
  DBUG_ENTER("mysql_table_dump");
  db = (db && db[0]) ? db : thd->db;
1285
  if (!(table_list = (TABLE_LIST*) thd->calloc(sizeof(TABLE_LIST))))
1286
    DBUG_RETURN(1); // out of memory
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VIEW  
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1287
  table_list->db= db;
1288
  table_list->table_name= table_list->alias= tbl_name;
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VIEW  
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1289 1290
  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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1291

1292 1293
  if (!db || check_db_name(db))
  {
1294
    my_error(ER_WRONG_DB_NAME ,MYF(0), db ? db : "NULL");
1295 1296
    goto err;
  }
1297
  if (lower_case_table_names)
1298
    my_casedn_str(files_charset_info, tbl_name);
1299
  remove_escape(table_list->table_name);
1300 1301 1302 1303

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

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1304
  if (check_one_table_access(thd, SELECT_ACL, table_list))
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1305 1306
    goto err;
  thd->free_list = 0;
1307
  thd->query_length=(uint) strlen(tbl_name);
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1308
  thd->query = tbl_name;
1309
  if ((error = mysqld_dump_create_info(thd, table_list, -1)))
1310
  {
1311
    my_error(ER_GET_ERRNO, MYF(0), my_errno);
1312 1313
    goto err;
  }
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1314
  net_flush(&thd->net);
1315
  if ((error= table->file->dump(thd,fd)))
1316
    my_error(ER_GET_ERRNO, MYF(0), error);
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1317

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1318
err:
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1319
  DBUG_RETURN(error);
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1320 1321
}

1322 1323 1324 1325
/*
  Ends the current transaction and (maybe) begin the next

  SYNOPSIS
1326
    end_trans()
1327 1328 1329 1330 1331 1332 1333
      thd            Current thread
      completion     Completion type

  RETURN
    0 - OK
*/

1334
int end_trans(THD *thd, enum enum_mysql_completiontype completion)
1335 1336 1337
{
  bool do_release= 0;
  int res= 0;
1338
  DBUG_ENTER("end_trans");
1339

1340
  if (unlikely(thd->in_sub_stmt))
1341 1342 1343 1344
  {
    my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0));
    DBUG_RETURN(1);
  }
1345 1346 1347 1348 1349 1350 1351 1352
  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;
1353
    res= ha_commit(thd);
1354
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
1355 1356
    break;
  case COMMIT_RELEASE:
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1357
    do_release= 1; /* fall through */
1358 1359 1360 1361 1362 1363
  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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1364
    do_release= 1; /* fall through */
1365 1366 1367 1368
  case ROLLBACK:
  case ROLLBACK_AND_CHAIN:
  {
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
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1369
    if (ha_rollback(thd))
1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380
      res= -1;
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
    if (!res && (completion == ROLLBACK_AND_CHAIN))
      res= begin_trans(thd);
    break;
  }
  default:
    res= -1;
    my_error(ER_UNKNOWN_COM_ERROR, MYF(0));
    DBUG_RETURN(-1);
  }
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1381

1382 1383 1384
  if (res < 0)
    my_error(thd->killed_errno(), MYF(0));
  else if ((res == 0) && do_release)
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1385 1386
    thd->killed= THD::KILL_CONNECTION;

1387 1388
  DBUG_RETURN(res);
}
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1389

1390
#ifndef EMBEDDED_LIBRARY
1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401

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

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1402 1403 1404
bool do_command(THD *thd)
{
  char *packet;
1405 1406
  uint old_timeout;
  ulong packet_length;
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  NET *net;
  enum enum_server_command command;
  DBUG_ENTER("do_command");

  net= &thd->net;
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  /*
    indicator of uninitialized lex => normal flow of errors handling
    (see my_message_sql)
  */
1416
  thd->lex->current_select= 0;
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  packet=0;
1419
  old_timeout=net->read_timeout;
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  /* Wait max for 8 hours */
1421
  net->read_timeout=(uint) thd->variables.net_wait_timeout;
1422
  thd->clear_error();				// Clear error message
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  net_new_transaction(net);
  if ((packet_length=my_net_read(net)) == packet_error)
  {
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    DBUG_PRINT("info",("Got error %d reading command from socket %s",
		       net->error,
		       vio_description(net->vio)));
    /* Check if we can continue without closing the connection */
    if (net->error != 3)
1432 1433
    {
      statistic_increment(aborted_threads,&LOCK_status);
1434
      DBUG_RETURN(TRUE);			// We have to close it.
1435
    }
1436
    net_send_error(thd, net->last_errno, NullS);
1437
    net->error= 0;
1438
    DBUG_RETURN(FALSE);
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  }
  else
  {
    packet=(char*) net->read_pos;
    command = (enum enum_server_command) (uchar) packet[0];
1444 1445
    if (command >= COM_END)
      command= COM_END;				// Wrong command
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    DBUG_PRINT("info",("Command on %s = %d (%s)",
		       vio_description(net->vio), command,
		       command_name[command]));
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1449
  }
1450
  net->read_timeout=old_timeout;		// restore it
1451 1452 1453 1454 1455 1456 1457 1458 1459
  /*
    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.
  */
1460
  DBUG_RETURN(dispatch_command(command,thd, packet+1, (uint) packet_length));
1461
}
1462
#endif  /* EMBEDDED_LIBRARY */
1463

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/*
   Perform one connection-level (COM_XXXX) command.
  SYNOPSIS
    dispatch_command()
    thd             connection handle
    command         type of command to perform 
    packet          data for the command, packet is always null-terminated
    packet_length   length of packet + 1 (to show that data is
                    null-terminated) except for COM_SLEEP, where it
                    can be zero.
  RETURN VALUE
    0   ok
    1   request of thread shutdown, i. e. if command is
        COM_QUIT/COM_SHUTDOWN
*/
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bool dispatch_command(enum enum_server_command command, THD *thd,
		      char* packet, uint packet_length)
{
  NET *net= &thd->net;
1485
  bool error= 0;
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  DBUG_ENTER("dispatch_command");

1488 1489 1490
  if (thd->killed == THD::KILL_QUERY || thd->killed == THD::KILL_BAD_DATA)
    thd->killed= THD::NOT_KILLED;

1491
  thd->command=command;
1492
  /*
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    Commands which always take a long time are logged into
    the slow log only if opt_log_slow_admin_statements is set.
1495
  */
1496
  thd->enable_slow_log= TRUE;
1497
  thd->lex->sql_command= SQLCOM_END; /* to avoid confusing VIEW detectors */
1498
  thd->set_time();
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  VOID(pthread_mutex_lock(&LOCK_thread_count));
  thd->query_id=query_id;
  if (command != COM_STATISTICS && command != COM_PING)
1502
    next_query_id();
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  thread_running++;
1504
  /* TODO: set thd->lex->sql_command to SQLCOM_END here */
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  VOID(pthread_mutex_unlock(&LOCK_thread_count));
1506

1507 1508
  thd->server_status&=
           ~(SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED);
1509
  switch (command) {
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1510
  case COM_INIT_DB:
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  {
    LEX_STRING tmp;
1513 1514
    statistic_increment(thd->status_var.com_stat[SQLCOM_CHANGE_DB],
			&LOCK_status);
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    thd->convert_string(&tmp, system_charset_info,
			packet, strlen(packet), thd->charset());
    if (!mysql_change_db(thd, tmp.str))
      mysql_log.write(thd,command,"%s",thd->db);
    break;
  }
1521
#ifdef HAVE_REPLICATION
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  case COM_REGISTER_SLAVE:
  {
1524
    if (!register_slave(thd, (uchar*)packet, packet_length))
1525
      send_ok(thd);
1526 1527
    break;
  }
1528
#endif
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  case COM_TABLE_DUMP:
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  {
    char *db, *tbl_name;
    uint db_len= *(uchar*) packet;
    uint tbl_len= *(uchar*) (packet + db_len + 1);

1535
    statistic_increment(thd->status_var.com_other, &LOCK_status);
1536
    thd->enable_slow_log= opt_log_slow_admin_statements;
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    db= thd->alloc(db_len + tbl_len + 2);
    tbl_name= strmake(db, packet + 1, db_len)+1;
    strmake(tbl_name, packet + db_len + 2, tbl_len);
1540
    mysql_table_dump(thd, db, tbl_name, -1);
1541 1542
    break;
  }
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1543 1544
  case COM_CHANGE_USER:
  {
1545
    thd->change_user();
1546
    thd->clear_error();                         // if errors from rollback
1547

1548
    statistic_increment(thd->status_var.com_other, &LOCK_status);
1549
    char *user= (char*) packet;
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    char *passwd= strend(user)+1;
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    /* 
      Old clients send null-terminated string ('\0' for empty string) for
      password.  New clients send the size (1 byte) + string (not null
      terminated, so also '\0' for empty string).
    */
1556
    char db_buff[NAME_LEN+1];                 // buffer to store db in utf8 
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    char *db= passwd;
    uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ? 
      *passwd++ : strlen(passwd);
    db+= passwd_len + 1;
1561
#ifndef EMBEDDED_LIBRARY
1562
    /* Small check for incoming packet */
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    if ((uint) ((uchar*) db - net->read_pos) > packet_length)
1564
    {
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      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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      break;
    }
1568
#endif
1569
    /* Convert database name to utf8 */
1570
    uint dummy_errors;
1571 1572
    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
                             system_charset_info, db, strlen(db),
1573
                             thd->charset(), &dummy_errors)]= 0;
1574
    db= db_buff;
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1576 1577 1578 1579 1580 1581 1582
    /* Save user and privileges */
    uint save_master_access= thd->master_access;
    uint save_db_access= thd->db_access;
    uint save_db_length= thd->db_length;
    char *save_user= thd->user;
    char *save_priv_user= thd->priv_user;
    char *save_db= thd->db;
1583
    USER_CONN *save_user_connect= thd->user_connect;
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1584 1585
    
    if (!(thd->user= my_strdup(user, MYF(0))))
1586 1587
    {
      thd->user= save_user;
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      my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
1589 1590
      break;
    }
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1592 1593
    /* Clear variables that are allocated */
    thd->user_connect= 0;
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1594
    int res= check_user(thd, COM_CHANGE_USER, passwd, passwd_len, db, FALSE);
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1595

1596 1597
    if (res)
    {
1598
      /* authentication failure, we shall restore old user */
1599
      if (res > 0)
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        my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
1601 1602 1603
      x_free(thd->user);
      thd->user= save_user;
      thd->priv_user= save_priv_user;
1604
      thd->user_connect= save_user_connect;
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      thd->master_access= save_master_access;
      thd->db_access= save_db_access;
      thd->db= save_db;
      thd->db_length= save_db_length;
    }
    else
    {
      /* we've authenticated new user */
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      if (save_user_connect)
	decrease_user_connections(save_user_connect);
1615 1616 1617
      x_free((gptr) save_db);
      x_free((gptr) save_user);
    }
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    break;
  }
1620
  case COM_STMT_EXECUTE:
1621
  {
1622
    mysql_stmt_execute(thd, packet, packet_length);
1623 1624
    break;
  }
1625
  case COM_STMT_FETCH:
1626 1627 1628 1629
  {
    mysql_stmt_fetch(thd, packet, packet_length);
    break;
  }
1630
  case COM_STMT_SEND_LONG_DATA:
1631
  {
1632
    mysql_stmt_get_longdata(thd, packet, packet_length);
1633 1634
    break;
  }
1635
  case COM_STMT_PREPARE:
1636
  {
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1637
    mysql_stmt_prepare(thd, packet, packet_length, 0);
1638 1639
    break;
  }
1640
  case COM_STMT_CLOSE:
1641
  {
1642
    mysql_stmt_close(thd, packet);
1643 1644
    break;
  }
1645
  case COM_STMT_RESET:
1646 1647 1648 1649
  {
    mysql_stmt_reset(thd, packet);
    break;
  }
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1650 1651
  case COM_QUERY:
  {
1652 1653
    if (alloc_query(thd, packet, packet_length))
      break;					// fatal error is set
1654
    char *packet_end= thd->query + thd->query_length;
1655
    mysql_log.write(thd,command,"%s",thd->query);
1656
    DBUG_PRINT("query",("%-.4096s",thd->query));
1657
    mysql_parse(thd,thd->query, thd->query_length);
1658

1659
    while (!thd->killed && thd->lex->found_semicolon && !thd->net.report_error)
1660
    {
1661
      char *packet= thd->lex->found_semicolon;
1662
      net->no_send_error= 0;
1663
      /*
1664
        Multiple queries exits, execute them individually
1665
	in embedded server - just store them to be executed later 
1666
      */
1667
#ifndef EMBEDDED_LIBRARY
1668 1669
      if (thd->lock || thd->open_tables || thd->derived_tables ||
          thd->prelocked_mode)
1670
        close_thread_tables(thd);
1671
#endif
1672
      ulong length= (ulong)(packet_end-packet);
1673

1674
      log_slow_statement(thd);
1675

1676
      /* Remove garbage at start of query */
1677
      while (my_isspace(thd->charset(), *packet) && length > 0)
1678 1679 1680 1681
      {
        packet++;
        length--;
      }
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1682
      VOID(pthread_mutex_lock(&LOCK_thread_count));
1683
      thd->query_length= length;
1684
      thd->query= packet;
1685
      thd->query_id= next_query_id();
1686
      thd->set_time(); /* Reset the query start time. */
1687
      /* TODO: set thd->lex->sql_command to SQLCOM_END here */
1688
      VOID(pthread_mutex_unlock(&LOCK_thread_count));
1689
#ifndef EMBEDDED_LIBRARY
1690
      mysql_parse(thd, packet, length);
1691
#else
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1692 1693 1694 1695 1696 1697 1698 1699 1700 1701
      /*
	'packet' can point inside the query_rest's buffer
	so we have to do memmove here
       */
      if (thd->query_rest.length() > length)
      {
	memmove(thd->query_rest.c_ptr(), packet, length);
	thd->query_rest.length(length);
      }
      else
1702
	thd->query_rest.copy(packet, length, thd->query_rest.charset());
1703 1704 1705

      thd->server_status&= ~ (SERVER_QUERY_NO_INDEX_USED |
                              SERVER_QUERY_NO_GOOD_INDEX_USED);
1706 1707
      break;
#endif /*EMBEDDED_LIBRARY*/
1708 1709
    }

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1710 1711 1712 1713 1714
    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),WAIT_PRIOR);
    DBUG_PRINT("info",("query ready"));
    break;
  }
1715
  case COM_FIELD_LIST:				// This isn't actually needed
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1716
#ifdef DONT_ALLOW_SHOW_COMMANDS
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1717 1718
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0));	/* purecov: inspected */
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1719 1720 1721
    break;
#else
  {
1722
    char *fields, *pend;
1723 1724
    /* Locked closure of all tables */
    TABLE_LIST *locked_tables= NULL;
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1725
    TABLE_LIST table_list;
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1726
    LEX_STRING conv_name;
1727
    /* Saved variable value */
1728 1729
    my_bool old_innodb_table_locks= 
              IF_INNOBASE_DB(thd->variables.innodb_table_locks, FALSE);
1730

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1731

1732 1733
    statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_FIELDS],
			&LOCK_status);
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1734 1735 1736
    bzero((char*) &table_list,sizeof(table_list));
    if (!(table_list.db=thd->db))
    {
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1737
      my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
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1738 1739
      break;
    }
1740
    pend= strend(packet);
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1741 1742
    thd->convert_string(&conv_name, system_charset_info,
			packet, (uint) (pend-packet), thd->charset());
1743
    table_list.alias= table_list.table_name= conv_name.str;
1744
    packet= pend+1;
1745 1746 1747 1748 1749 1750 1751 1752 1753

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

1754
    thd->query_length= strlen(packet);       // for simplicity: don't optimize
1755 1756
    if (!(thd->query=fields=thd->memdup(packet,thd->query_length+1)))
      break;
1757
    mysql_log.write(thd,command,"%s %s",table_list.table_name, fields);
1758
    if (lower_case_table_names)
1759 1760
      my_casedn_str(files_charset_info, table_list.table_name);
    remove_escape(table_list.table_name);	// This can't have wildcards
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1761

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1762 1763
    if (check_access(thd,SELECT_ACL,table_list.db,&table_list.grant.privilege,
		     0, 0))
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1764
      break;
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1765 1766
    if (grant_option &&
	check_grant(thd, SELECT_ACL, &table_list, 2, UINT_MAX, 0))
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1767
      break;
1768 1769 1770 1771 1772 1773
    /* init structures for VIEW processing */
    table_list.select_lex= &(thd->lex->select_lex);
    mysql_init_query(thd, (uchar*)"", 0);
    thd->lex->
      select_lex.table_list.link_in_list((byte*) &table_list,
                                         (byte**) &table_list.next_local);
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1774
    thd->lex->add_to_query_tables(&table_list);
1775

1776 1777
    /* switch on VIEW optimisation: do not fill temporary tables */
    thd->lex->sql_command= SQLCOM_SHOW_FIELDS;
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1778
    mysqld_list_fields(thd,&table_list,fields);
1779
    thd->lex->unit.cleanup();
1780
    thd->cleanup_after_query();
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1781 1782 1783 1784
    break;
  }
#endif
  case COM_QUIT:
1785
    /* We don't calculate statistics for this command */
1786
    mysql_log.write(thd,command,NullS);
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1787 1788 1789 1790
    net->error=0;				// Don't give 'abort' message
    error=TRUE;					// End server
    break;

1791
  case COM_CREATE_DB:				// QQ: To be removed
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1792
    {
1793
      char *db=thd->strdup(packet), *alias;
1794
      HA_CREATE_INFO create_info;
1795

1796 1797
      statistic_increment(thd->status_var.com_stat[SQLCOM_CREATE_DB],
			  &LOCK_status);
1798
      // null test to handle EOM
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1799
      if (!db || !(alias= thd->strdup(db)) || check_db_name(db))
1800
      {
1801
	my_error(ER_WRONG_DB_NAME, MYF(0), db ? db : "NULL");
1802 1803
	break;
      }
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1804
      if (check_access(thd,CREATE_ACL,db,0,1,0))
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1805
	break;
1806
      mysql_log.write(thd,command,packet);
1807
      bzero(&create_info, sizeof(create_info));
1808 1809
      mysql_create_db(thd, (lower_case_table_names == 2 ? alias : db),
                      &create_info, 0);
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1810 1811
      break;
    }
1812
  case COM_DROP_DB:				// QQ: To be removed
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1813
    {
1814 1815
      statistic_increment(thd->status_var.com_stat[SQLCOM_DROP_DB],
			  &LOCK_status);
1816
      char *db=thd->strdup(packet);
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1817
      /*  null test to handle EOM */
1818
      if (!db || check_db_name(db))
1819
      {
1820
	my_error(ER_WRONG_DB_NAME, MYF(0), db ? db : "NULL");
1821 1822
	break;
      }
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1823
      if (check_access(thd,DROP_ACL,db,0,1,0))
1824
	break;
1825 1826
      if (thd->locked_tables || thd->active_transaction())
      {
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1827 1828
	my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                   ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
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1829
	break;
1830
      }
1831
      mysql_log.write(thd,command,db);
1832
      mysql_rm_db(thd, db, 0, 0);
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1833 1834
      break;
    }
1835
#ifndef EMBEDDED_LIBRARY
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1836 1837
  case COM_BINLOG_DUMP:
    {
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1838 1839 1840 1841
      ulong pos;
      ushort flags;
      uint32 slave_server_id;

1842
      statistic_increment(thd->status_var.com_other,&LOCK_status);
1843
      thd->enable_slow_log= opt_log_slow_admin_statements;
1844
      if (check_global_access(thd, REPL_SLAVE_ACL))
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1845
	break;
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1846

1847
      /* TODO: The following has to be changed to an 8 byte integer */
1848 1849
      pos = uint4korr(packet);
      flags = uint2korr(packet + 4);
1850
      thd->server_id=0; /* avoid suicide */
1851
      if ((slave_server_id= uint4korr(packet+6))) // mysqlbinlog.server_id==0
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1852
	kill_zombie_dump_threads(slave_server_id);
1853
      thd->server_id = slave_server_id;
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1854 1855 1856

      mysql_log.write(thd, command, "Log: '%s'  Pos: %ld", packet+10,
                      (long) pos);
1857
      mysql_binlog_send(thd, thd->strdup(packet + 10), (my_off_t) pos, flags);
1858
      unregister_slave(thd,1,1);
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1859
      /*  fake COM_QUIT -- if we get here, the thread needs to terminate */
1860 1861
      error = TRUE;
      net->error = 0;
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1862 1863
      break;
    }
1864
#endif
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1865 1866
  case COM_REFRESH:
    {
1867 1868
      statistic_increment(thd->status_var.com_stat[SQLCOM_FLUSH],
			  &LOCK_status);
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      ulong options= (ulong) (uchar) packet[0];
1870
      if (check_global_access(thd,RELOAD_ACL))
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1871
	break;
1872
      mysql_log.write(thd,command,NullS);
1873
      if (!reload_acl_and_cache(thd, options, (TABLE_LIST*) 0, NULL))
1874
        send_ok(thd);
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1875 1876
      break;
    }
1877
#ifndef EMBEDDED_LIBRARY
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1878
  case COM_SHUTDOWN:
1879
  {
1880
    statistic_increment(thd->status_var.com_other, &LOCK_status);
1881
    if (check_global_access(thd,SHUTDOWN_ACL))
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1882
      break; /* purecov: inspected */
1883
    /*
1884 1885 1886 1887
      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].
1888
    */
1889 1890
    enum mysql_enum_shutdown_level level=
      (enum mysql_enum_shutdown_level) (uchar) packet[0];
1891
    DBUG_PRINT("quit",("Got shutdown command for level %u", level));
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    if (level == SHUTDOWN_DEFAULT)
      level= SHUTDOWN_WAIT_ALL_BUFFERS; // soon default will be configurable
    else if (level != SHUTDOWN_WAIT_ALL_BUFFERS)
    {
      my_error(ER_NOT_SUPPORTED_YET, MYF(0), "this shutdown level");
      break;
    }
1899
    DBUG_PRINT("quit",("Got shutdown command for level %u", level));
1900
    mysql_log.write(thd,command,NullS);
1901
    send_eof(thd);
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1902 1903 1904
#ifdef __WIN__
    sleep(1);					// must wait after eof()
#endif
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1905
#ifndef OS2
1906
    send_eof(thd);				// This is for 'quit request'
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1907
#endif
1908
    close_connection(thd, 0, 1);
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    close_thread_tables(thd);			// Free before kill
    kill_mysql();
    error=TRUE;
    break;
1913
  }
1914
#endif
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1915 1916
  case COM_STATISTICS:
  {
1917
    mysql_log.write(thd,command,NullS);
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    statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_STATUS],
			&LOCK_status);
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1920
#ifndef EMBEDDED_LIBRARY
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1921
    char buff[200];
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#else
    char *buff= thd->net.last_error;
#endif
1925
    ulong uptime = (ulong) (thd->start_time - start_time);
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1926
    sprintf((char*) buff,
1927
	    "Uptime: %lu  Threads: %d  Questions: %lu  Slow queries: %lu  Opens: %lu  Flush tables: %lu  Open tables: %u  Queries per second avg: %.3f",
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1928
	    uptime,
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	    (int) thread_count, (ulong) thd->query_id,
            (ulong) thd->status_var.long_query_count,
	    thd->status_var.opened_tables, refresh_version, cached_tables(),
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	    (uptime ? (ulonglong2double(thd->query_id) / (double) uptime) :
	     (double) 0));
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1934
#ifdef SAFEMALLOC
1935
    if (sf_malloc_cur_memory)				// Using SAFEMALLOC
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1936
      sprintf(strend(buff), "  Memory in use: %ldK  Max memory used: %ldK",
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	      (sf_malloc_cur_memory+1023L)/1024L,
	      (sf_malloc_max_memory+1023L)/1024L);
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1939 1940
#endif
#ifndef EMBEDDED_LIBRARY
1941
    VOID(my_net_write(net, buff,(uint) strlen(buff)));
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1942
    VOID(net_flush(net));
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1943
#endif
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1944 1945 1946
    break;
  }
  case COM_PING:
1947
    statistic_increment(thd->status_var.com_other, &LOCK_status);
1948
    send_ok(thd);				// Tell client we are alive
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1949 1950
    break;
  case COM_PROCESS_INFO:
1951 1952
    statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_PROCESSLIST],
			&LOCK_status);
1953
    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
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1954
      break;
1955
    mysql_log.write(thd,command,NullS);
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1956 1957
    mysqld_list_processes(thd,
			  thd->master_access & PROCESS_ACL ? 
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1958
			  NullS : thd->priv_user, 0);
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1959 1960 1961
    break;
  case COM_PROCESS_KILL:
  {
1962
    statistic_increment(thd->status_var.com_stat[SQLCOM_KILL], &LOCK_status);
1963
    ulong id=(ulong) uint4korr(packet);
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SCRUM  
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1964
    kill_one_thread(thd,id,false);
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1965 1966
    break;
  }
1967 1968
  case COM_SET_OPTION:
  {
1969 1970
    statistic_increment(thd->status_var.com_stat[SQLCOM_SET_OPTION],
			&LOCK_status);
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    enum_mysql_set_option command= (enum_mysql_set_option) uint2korr(packet);
    switch (command) {
    case MYSQL_OPTION_MULTI_STATEMENTS_ON:
      thd->client_capabilities|= CLIENT_MULTI_STATEMENTS;
1975
      send_eof(thd);
1976 1977 1978
      break;
    case MYSQL_OPTION_MULTI_STATEMENTS_OFF:
      thd->client_capabilities&= ~CLIENT_MULTI_STATEMENTS;
1979
      send_eof(thd);
1980 1981
      break;
    default:
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1982
      my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
1983 1984 1985 1986
      break;
    }
    break;
  }
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1987
  case COM_DEBUG:
1988
    statistic_increment(thd->status_var.com_other, &LOCK_status);
1989
    if (check_global_access(thd, SUPER_ACL))
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1990
      break;					/* purecov: inspected */
1991
    mysql_print_status();
1992
    mysql_log.write(thd,command,NullS);
1993
    send_eof(thd);
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1994 1995 1996 1997 1998
    break;
  case COM_SLEEP:
  case COM_CONNECT:				// Impossible here
  case COM_TIME:				// Impossible from client
  case COM_DELAYED_INSERT:
1999
  case COM_END:
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2000
  default:
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2001
    my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0));
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2002 2003
    break;
  }
2004 2005
  if (thd->lock || thd->open_tables || thd->derived_tables ||
      thd->prelocked_mode)
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2006 2007 2008 2009
  {
    thd->proc_info="closing tables";
    close_thread_tables(thd);			/* Free tables */
  }
2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
  /*
    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())
    thd->transaction.xid.null();
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2021

2022 2023 2024
  /* report error issued during command execution */
  if (thd->killed_errno() && !thd->net.report_error)
    thd->send_kill_message();
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2025
  if (thd->net.report_error)
2026
    net_send_error(thd);
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2027

2028
  log_slow_statement(thd);
2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043

  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);
}


2044
void log_slow_statement(THD *thd)
2045
{
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2046
  time_t start_of_query=thd->start_time;
2047
  thd->end_time();				// Set start time
2048

2049 2050 2051 2052 2053
  /*
    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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2054
  {
2055 2056
    thd->proc_info="logging slow query";

2057 2058
    if ((ulong) (thd->start_time - thd->time_after_lock) >
	thd->variables.long_query_time ||
2059 2060
	((thd->server_status &
	  (SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED)) &&
2061
	 (specialflag & SPECIAL_LOG_QUERIES_NOT_USING_INDEXES)))
2062
    {
2063
      thd->status_var.long_query_count++;
2064 2065
      mysql_slow_log.write(thd, thd->query, thd->query_length, start_of_query);
    }
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2066 2067 2068
  }
}

2069

2070 2071 2072 2073 2074
int prepare_schema_table(THD *thd, LEX *lex, Table_ident *table_ident,
                         enum enum_schema_tables schema_table_idx)
{
  DBUG_ENTER("prepare_schema_table");
  SELECT_LEX *sel= 0;
2075
  switch (schema_table_idx) {
2076 2077
  case SCH_SCHEMATA:
#if defined(DONT_ALLOW_SHOW_COMMANDS)
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2078 2079
    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0));   /* purecov: inspected */
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    DBUG_RETURN(1);
#else
    if ((specialflag & SPECIAL_SKIP_SHOW_DB) &&
	check_global_access(thd, SHOW_DB_ACL))
      DBUG_RETURN(1);
    break;
#endif
  case SCH_TABLE_NAMES:
  case SCH_TABLES:
  case SCH_VIEWS:
2090
  case SCH_TRIGGERS:
2091
#ifdef DONT_ALLOW_SHOW_COMMANDS
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2092 2093
    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */
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    DBUG_RETURN(1);
#else
    {
      char *db= lex->select_lex.db ? lex->select_lex.db : thd->db;
      if (!db)
      {
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2100 2101
	my_message(ER_NO_DB_ERROR,
                   ER(ER_NO_DB_ERROR), MYF(0)); /* purecov: inspected */
2102 2103 2104 2105 2106
        DBUG_RETURN(1);				/* purecov: inspected */
      }
      remove_escape(db);				// Fix escaped '_'
      if (check_db_name(db))
      {
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2107
        my_error(ER_WRONG_DB_NAME, MYF(0), db);
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        DBUG_RETURN(1);
      }
      if (check_access(thd,SELECT_ACL,db,&thd->col_access,0,0))
        DBUG_RETURN(1);			        /* purecov: inspected */
      if (!thd->col_access && check_grant_db(thd,db))
      {
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2114 2115
	my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
                 thd->priv_user, thd->priv_host, db);
2116 2117
	DBUG_RETURN(1);
      }
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      /*
        We need to do a copy to make this prepared statement safe if this
        was thd->db
      */
      lex->select_lex.db= thd->strdup(db);
2123 2124 2125 2126 2127 2128
      break;
    }
#endif
  case SCH_COLUMNS:
  case SCH_STATISTICS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
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2129 2130
    my_message(ER_NOT_ALLOWED_COMMAND,
               ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */
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    DBUG_RETURN(1);
#else
    if (table_ident)
    {
      TABLE_LIST **query_tables_last= lex->query_tables_last;
      sel= new SELECT_LEX();
      sel->init_query();
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2138
      if (!sel->add_table_to_list(thd, table_ident, 0, 0, TL_READ, 
2139 2140 2141 2142 2143 2144
                                 (List<String> *) 0, (List<String> *) 0))
        DBUG_RETURN(1);
      lex->query_tables_last= query_tables_last;
      TABLE_LIST *table_list= (TABLE_LIST*) sel->table_list.first;
      char *db= table_list->db;
      remove_escape(db);			// Fix escaped '_'
2145
      remove_escape(table_list->table_name);
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      if (check_access(thd,SELECT_ACL | EXTRA_ACL,db,
                       &table_list->grant.privilege, 0, 0))
        DBUG_RETURN(1);				/* purecov: inspected */
      if (grant_option && check_grant(thd, SELECT_ACL, table_list, 2,
                                      UINT_MAX, 0))
        DBUG_RETURN(1);
      break;
    }
#endif
2155 2156 2157
  case SCH_OPEN_TABLES:
  case SCH_VARIABLES:
  case SCH_STATUS:
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  case SCH_PROCEDURES:
  case SCH_CHARSETS:
  case SCH_COLLATIONS:
  case SCH_COLLATION_CHARACTER_SET_APPLICABILITY:
  case SCH_USER_PRIVILEGES:
  case SCH_SCHEMA_PRIVILEGES:
  case SCH_TABLE_PRIVILEGES:
  case SCH_COLUMN_PRIVILEGES:
  case SCH_TABLE_CONSTRAINTS:
  case SCH_KEY_COLUMN_USAGE:
  default:
    break;
  }
  
  SELECT_LEX *select_lex= lex->current_select;
  if (make_schema_select(thd, select_lex, schema_table_idx))
  {
    DBUG_RETURN(1);
  }
  TABLE_LIST *table_list= (TABLE_LIST*) select_lex->table_list.first;
  table_list->schema_select_lex= sel;
2179
  table_list->schema_table_reformed= 1;
2180 2181
  statistic_increment(thd->status_var.com_stat[lex->orig_sql_command],
                      &LOCK_status);
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  DBUG_RETURN(0);
}


2186 2187
/*
  Read query from packet and store in thd->query
2188
  Used in COM_QUERY and COM_STMT_PREPARE
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  DESCRIPTION
    Sets the following THD variables:
      query
      query_length

  RETURN VALUES
2196 2197
    FALSE ok
    TRUE  error;  In this case thd->fatal_error is set
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*/

bool alloc_query(THD *thd, char *packet, ulong packet_length)
{
  packet_length--;				// Remove end null
2203
  /* Remove garbage at start and end of query */
2204
  while (my_isspace(thd->charset(),packet[0]) && packet_length > 0)
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  {
    packet++;
    packet_length--;
  }
  char *pos=packet+packet_length;		// Point at end null
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2210
  while (packet_length > 0 &&
2211
	 (pos[-1] == ';' || my_isspace(thd->charset() ,pos[-1])))
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  {
    pos--;
    packet_length--;
  }
  /* We must allocate some extra memory for query cache */
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2217
  thd->query_length= 0;                        // Extra safety: Avoid races
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  if (!(thd->query= (char*) thd->memdup_w_gap((gptr) (packet),
					      packet_length,
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					      thd->db_length+ 1 +
					      QUERY_CACHE_FLAGS_SIZE)))
2222
    return TRUE;
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  thd->query[packet_length]=0;
  thd->query_length= packet_length;
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  /* Reclaim some memory */
  thd->packet.shrink(thd->variables.net_buffer_length);
  thd->convert_buffer.shrink(thd->variables.net_buffer_length);
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  if (!(specialflag & SPECIAL_NO_PRIOR))
    my_pthread_setprio(pthread_self(),QUERY_PRIOR);
2232
  return FALSE;
2233 2234
}

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/****************************************************************************
** mysql_execute_command
** Execute command saved in thd and current_lex->sql_command
****************************************************************************/

2240
bool
2241
mysql_execute_command(THD *thd)
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2242
{
2243
  bool	res= FALSE;
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2244
  int result= 0;
2245
  LEX	*lex= thd->lex;
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  /* first SELECT_LEX (have special meaning for many of non-SELECTcommands) */
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  SELECT_LEX *select_lex= &lex->select_lex;
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  bool slave_fake_lock= 0;
  MYSQL_LOCK *fake_prev_lock= 0;
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2250
  /* first table of first SELECT_LEX */
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  TABLE_LIST *first_table= (TABLE_LIST*) select_lex->table_list.first;
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  /* list of all tables in query */
  TABLE_LIST *all_tables;
  /* most outer SELECT_LEX_UNIT of query */
2255
  SELECT_LEX_UNIT *unit= &lex->unit;
2256
  /* Saved variable value */
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2257
  DBUG_ENTER("mysql_execute_command");
2258
  thd->net.no_send_error= 0;
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2259

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

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

    Because of above in place where should be at least one table in most
    outer SELECT_LEX we have following check:
    DBUG_ASSERT(first_table == all_tables);
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
  */
  lex->first_lists_tables_same();
2276
  /* should be assigned after making first tables same */
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2277
  all_tables= lex->query_tables;
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  /* set context for commands which do not use setup_tables */
  select_lex->
    context.resolve_in_table_list_only((TABLE_LIST*)select_lex->
                                       table_list.first);
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2282

2283 2284 2285 2286 2287
  /*
    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.
2288
    Don't reset warnings when executing a stored routine.
2289
  */
2290
  if ((all_tables || &lex->select_lex != lex->all_selects_list ||
2291
       lex->sroutines.records) && !thd->spcont ||
2292
      lex->time_zone_tables_used)
monty@mysql.com's avatar
monty@mysql.com committed
2293
    mysql_reset_errors(thd, 0);
2294

hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
2295
#ifdef HAVE_REPLICATION
2296 2297
  if (thd->slave_thread)
  {
2298
    if (lex->sql_command == SQLCOM_UPDATE_MULTI)
2299 2300 2301
    {
      DBUG_PRINT("info",("need faked locked tables"));
      
2302
      if (check_multi_update_lock(thd))
2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313
        goto error;

      /* Fix for replication, the tables are opened and locked,
         now we pretend that we have performed a LOCK TABLES action */
	 
      fake_prev_lock= thd->locked_tables;
      if (thd->lock)
        thd->locked_tables= thd->lock;
      thd->lock= 0;
      slave_fake_lock= 1;
    }
peter@mysql.com's avatar
peter@mysql.com committed
2314
    /*
monty@hundin.mysql.fi's avatar
merge  
monty@hundin.mysql.fi committed
2315
      Skip if we are in the slave thread, some table rules have been
2316 2317 2318 2319
      given and the table list says the query should not be replicated.
      Exception is DROP TEMPORARY TABLE IF EXISTS: we always execute it
      (otherwise we have stale files on slave caused by exclusion of one tmp
      table).
monty@hundin.mysql.fi's avatar
merge  
monty@hundin.mysql.fi committed
2320
    */
2321 2322
    if (!(lex->sql_command == SQLCOM_DROP_TABLE &&
          lex->drop_temporary && lex->drop_if_exists) &&
guilhem@mysql.com's avatar
Merge  
guilhem@mysql.com committed
2323
        all_tables_not_ok(thd, all_tables))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
2324 2325
    {
      /* we warn the slave SQL thread */
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2326
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
2327
      DBUG_RETURN(0);
guilhem@mysql.com's avatar
guilhem@mysql.com committed
2328
    }
monty@hundin.mysql.fi's avatar
merge  
monty@hundin.mysql.fi committed
2329 2330
#ifndef TO_BE_DELETED
    /*
2331 2332 2333
      This is a workaround to deal with the shortcoming in 3.23.44-3.23.46
      masters in RELEASE_LOCK() logging. We re-write SELECT RELEASE_LOCK()
      as DO RELEASE_LOCK()
monty@hundin.mysql.fi's avatar
merge  
monty@hundin.mysql.fi committed
2334
    */
2335 2336 2337
    if (lex->sql_command == SQLCOM_SELECT)
    {
      lex->sql_command = SQLCOM_DO;
2338
      lex->insert_list = &select_lex->item_list;
2339
    }
monty@hundin.mysql.fi's avatar
merge  
monty@hundin.mysql.fi committed
2340
#endif
2341
  }
hf@deer.(none)'s avatar
hf@deer.(none) committed
2342
#endif /* !HAVE_REPLICATION */
2343

2344 2345 2346 2347 2348
  /*
    When option readonly is set deny operations which change tables.
    Except for the replication thread and the 'super' users.
  */
  if (opt_readonly &&
monty@mysql.com's avatar
monty@mysql.com committed
2349
      !(thd->slave_thread || (thd->master_access & SUPER_ACL)) &&
2350
      uc_update_queries[lex->sql_command])
2351
  {
2352
    my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only");
2353
    DBUG_RETURN(-1);
2354
  }
2355 2356 2357
  if(lex->orig_sql_command == SQLCOM_END)
    statistic_increment(thd->status_var.com_stat[lex->sql_command],
                        &LOCK_status);
2358

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2359 2360 2361
  switch (lex->sql_command) {
  case SQLCOM_SELECT:
  {
2362 2363 2364 2365
    /* assign global limit variable if limit is not given */
    {
      SELECT_LEX *param= lex->unit.global_parameters;
      if (!param->explicit_limit)
2366 2367
	param->select_limit=
          new Item_int((ulonglong)thd->variables.select_limit);
2368 2369
    }

2370
    select_result *result=lex->result;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2371
    if (all_tables)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2372
    {
2373 2374 2375 2376 2377 2378
      if (lex->orig_sql_command != SQLCOM_SHOW_STATUS_PROC &&
          lex->orig_sql_command != SQLCOM_SHOW_STATUS_FUNC)
        res= check_table_access(thd,
                                lex->exchange ? SELECT_ACL | FILE_ACL :
                                SELECT_ACL,
                                all_tables, 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2379 2380
    }
    else
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2381 2382 2383
      res= check_access(thd,
			lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL,
			any_db, 0, 0, 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2384
    if (res)
2385
      goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2386

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2387
    if (!(res= open_and_lock_tables(thd, all_tables)))
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2388
    {
2389
      if (lex->describe)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2390
      {
2391
	if (!(result= new select_send()))
2392
	  goto error;
2393 2394
	else
	  thd->send_explain_fields(result);
2395
	res= mysql_explain_union(thd, &thd->lex->unit, result);
2396 2397 2398 2399 2400
	if (lex->describe & DESCRIBE_EXTENDED)
	{
	  char buff[1024];
	  String str(buff,(uint32) sizeof(buff), system_charset_info);
	  str.length(0);
pem@mysql.comhem.se's avatar
pem@mysql.comhem.se committed
2401
	  thd->lex->unit.print(&str);
2402 2403 2404 2405
	  str.append('\0');
	  push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
		       ER_YES, str.ptr());
	}
2406
	result->send_eof();
2407
        delete result;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2408 2409 2410
      }
      else
      {
2411
	if (!result && !(result= new select_send()))
2412
          goto error;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2413
	query_cache_store_query(thd, all_tables);
2414
	res= handle_select(thd, lex, result, 0);
2415 2416
        if (result != lex->result)
          delete result;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2417
      }
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2418
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2419 2420
    break;
  }
sergefp@mysql.com's avatar
sergefp@mysql.com committed
2421
  case SQLCOM_PREPARE:
2422
  {
2423 2424 2425 2426
    char *query_str;
    uint query_len;
    if (lex->prepared_stmt_code_is_varref)
    {
2427
      /* This is PREPARE stmt FROM @var. */
2428 2429 2430 2431
      String str;
      CHARSET_INFO *to_cs= thd->variables.collation_connection;
      bool need_conversion;
      user_var_entry *entry;
2432
      String *pstr= &str;
2433
      uint32 unused;
2434
      /*
2435 2436 2437
        Convert @var contents to string in connection character set. Although
        it is known that int/real/NULL value cannot be a valid query we still
        convert it for error messages to uniform.
2438
      */
2439 2440
      if ((entry=
             (user_var_entry*)hash_search(&thd->user_vars,
2441 2442 2443 2444
                                          (byte*)lex->prepared_stmt_code.str,
                                          lex->prepared_stmt_code.length))
          && entry->value)
      {
2445 2446
        my_bool is_var_null;
        pstr= entry->val_str(&is_var_null, &str, NOT_FIXED_DEC);
2447 2448 2449 2450
        /*
          NULL value of variable checked early as entry->value so here
          we can't get NULL in normal conditions
        */
2451 2452
        DBUG_ASSERT(!is_var_null);
        if (!pstr)
2453
          goto error;
2454 2455
      }
      else
2456 2457 2458 2459 2460
      {
        /*
          variable absent or equal to NULL, so we need to set variable to
          something reasonable to get readable error message during parsing
        */
2461
        str.set("NULL", 4, &my_charset_latin1);
2462 2463
      }

2464
      need_conversion=
2465 2466
        String::needs_conversion(pstr->length(), pstr->charset(),
                                 to_cs, &unused);
2467

2468 2469
      query_len= need_conversion? (pstr->length() * to_cs->mbmaxlen) :
                                  pstr->length();
2470
      if (!(query_str= alloc_root(thd->mem_root, query_len+1)))
2471
        goto error;
bell@sanja.is.com.ua's avatar
merge  
bell@sanja.is.com.ua committed
2472
 
2473
      if (need_conversion)
2474 2475 2476 2477 2478 2479
      {
        uint dummy_errors;
        query_len= copy_and_convert(query_str, query_len, to_cs,
                                    pstr->ptr(), pstr->length(),
                                    pstr->charset(), &dummy_errors);
      }
2480
      else
2481
        memcpy(query_str, pstr->ptr(), pstr->length());
2482
      query_str[query_len]= 0;
2483 2484 2485
    }
    else
    {
2486 2487
      query_str= lex->prepared_stmt_code.str;
      query_len= lex->prepared_stmt_code.length;
2488
      DBUG_PRINT("info", ("PREPARE: %.*s FROM '%.*s' \n",
2489 2490
                          lex->prepared_stmt_name.length,
                          lex->prepared_stmt_name.str,
2491
                          query_len, query_str));
2492
    }
2493
    thd->command= COM_STMT_PREPARE;
2494 2495
    if (!(res= mysql_stmt_prepare(thd, query_str, query_len + 1,
                                  &lex->prepared_stmt_name)))
sergefp@mysql.com's avatar
sergefp@mysql.com committed
2496 2497 2498 2499 2500
      send_ok(thd, 0L, 0L, "Statement prepared");
    break;
  }
  case SQLCOM_EXECUTE:
  {
2501
    DBUG_PRINT("info", ("EXECUTE: %.*s\n",
2502 2503 2504
                        lex->prepared_stmt_name.length,
                        lex->prepared_stmt_name.str));
    mysql_sql_stmt_execute(thd, &lex->prepared_stmt_name);
sergefp@mysql.com's avatar
sergefp@mysql.com committed
2505 2506 2507 2508 2509
    lex->prepared_stmt_params.empty();
    break;
  }
  case SQLCOM_DEALLOCATE_PREPARE:
  {
2510 2511 2512 2513
    Statement* stmt;
    DBUG_PRINT("info", ("DEALLOCATE PREPARE: %.*s\n", 
                        lex->prepared_stmt_name.length,
                        lex->prepared_stmt_name.str));
2514
    /* We account deallocate in the same manner as mysql_stmt_close */
konstantin@mysql.com's avatar
konstantin@mysql.com committed
2515
    statistic_increment(thd->status_var.com_stmt_close, &LOCK_status);
2516
    if ((stmt= thd->stmt_map.find_by_name(&lex->prepared_stmt_name)))
sergefp@mysql.com's avatar
sergefp@mysql.com committed
2517
    {
2518 2519
      thd->stmt_map.erase(stmt);
      send_ok(thd);
sergefp@mysql.com's avatar
sergefp@mysql.com committed
2520
    }
2521
    else
2522 2523
    {
      my_error(ER_UNKNOWN_STMT_HANDLER, MYF(0),
2524 2525
               lex->prepared_stmt_name.length,
               lex->prepared_stmt_name.str,
2526
               "DEALLOCATE PREPARE");
2527
      goto error;
2528
    }
sergefp@mysql.com's avatar
sergefp@mysql.com committed
2529 2530
    break;
  }
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2531
  case SQLCOM_DO:
2532 2533
    if (check_table_access(thd, SELECT_ACL, all_tables, 0) ||
        open_and_lock_tables(thd, all_tables))
2534
      goto error;
2535 2536

    res= mysql_do(thd, *lex->insert_list);
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2537 2538
    break;

2539
  case SQLCOM_EMPTY_QUERY:
2540
    send_ok(thd);
2541 2542
    break;

2543 2544 2545 2546
  case SQLCOM_HELP:
    res= mysqld_help(thd,lex->help_arg);
    break;

2547
#ifndef EMBEDDED_LIBRARY
2548
  case SQLCOM_PURGE:
2549
  {
2550
    if (check_global_access(thd, SUPER_ACL))
2551
      goto error;
monty@mysql.com's avatar
monty@mysql.com committed
2552
    /* PURGE MASTER LOGS TO 'file' */
2553 2554 2555
    res = purge_master_logs(thd, lex->to_log);
    break;
  }
2556 2557
  case SQLCOM_PURGE_BEFORE:
  {
2558 2559
    Item *it;

2560 2561
    if (check_global_access(thd, SUPER_ACL))
      goto error;
monty@mysql.com's avatar
monty@mysql.com committed
2562
    /* PURGE MASTER LOGS BEFORE 'data' */
2563
    it= (Item *)lex->value_list.head();
2564
    if ((!it->fixed && it->fix_fields(lex->thd, &it)) ||
2565
        it->check_cols(1))
2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576
    {
      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());
2577 2578
    break;
  }
2579
#endif
2580 2581
  case SQLCOM_SHOW_WARNS:
  {
2582 2583
    res= mysqld_show_warnings(thd, (ulong)
			      ((1L << (uint) MYSQL_ERROR::WARN_LEVEL_NOTE) |
2584 2585 2586
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_WARN) |
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR)
			       ));
2587 2588 2589 2590
    break;
  }
  case SQLCOM_SHOW_ERRORS:
  {
2591 2592
    res= mysqld_show_warnings(thd, (ulong)
			      (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR));
2593 2594
    break;
  }
2595 2596
  case SQLCOM_SHOW_NEW_MASTER:
  {
2597
    if (check_global_access(thd, REPL_SLAVE_ACL))
2598
      goto error;
2599
    /* This query don't work now. See comment in repl_failsafe.cc */
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2600
#ifndef WORKING_NEW_MASTER
2601 2602
    my_error(ER_NOT_SUPPORTED_YET, MYF(0), "SHOW NEW MASTER");
    goto error;
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2603
#else
2604 2605
    res = show_new_master(thd);
    break;
2606
#endif
2607
  }
2608

2609
#ifdef HAVE_REPLICATION
2610 2611
  case SQLCOM_SHOW_SLAVE_HOSTS:
  {
2612
    if (check_global_access(thd, REPL_SLAVE_ACL))
2613 2614 2615 2616
      goto error;
    res = show_slave_hosts(thd);
    break;
  }
2617 2618
  case SQLCOM_SHOW_BINLOG_EVENTS:
  {
2619
    if (check_global_access(thd, REPL_SLAVE_ACL))
2620
      goto error;
2621
    res = mysql_show_binlog_events(thd);
2622 2623
    break;
  }
2624 2625
#endif

2626
  case SQLCOM_BACKUP_TABLE:
2627
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2628 2629 2630
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL, all_tables, 0) ||
2631
	check_global_access(thd, FILE_ACL))
2632
      goto error; /* purecov: inspected */
2633
    thd->enable_slow_log= opt_log_slow_admin_statements;
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VIEW  
bell@sanja.is.com.ua committed
2634
    res = mysql_backup_table(thd, first_table);
2635

2636 2637
    break;
  }
2638
  case SQLCOM_RESTORE_TABLE:
2639
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2640 2641 2642
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, INSERT_ACL, all_tables, 0) ||
2643
	check_global_access(thd, FILE_ACL))
2644
      goto error; /* purecov: inspected */
2645
    thd->enable_slow_log= opt_log_slow_admin_statements;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2646
    res = mysql_restore_table(thd, first_table);
2647 2648
    break;
  }
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2649 2650
  case SQLCOM_ASSIGN_TO_KEYCACHE:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2651 2652 2653 2654
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
        check_access(thd, INDEX_ACL, first_table->db,
                     &first_table->grant.privilege, 0, 0))
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2655
      goto error;
2656
    res= mysql_assign_to_keycache(thd, first_table, &lex->ident);
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2657 2658
    break;
  }
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2659 2660
  case SQLCOM_PRELOAD_KEYS:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2661 2662 2663 2664
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_access(thd, INDEX_ACL, first_table->db,
                     &first_table->grant.privilege, 0, 0))
2665
      goto error;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2666
    res = mysql_preload_keys(thd, first_table);
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
2667 2668
    break;
  }
2669
#ifdef HAVE_REPLICATION
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2670
  case SQLCOM_CHANGE_MASTER:
2671
  {
2672
    if (check_global_access(thd, SUPER_ACL))
2673
      goto error;
2674
    pthread_mutex_lock(&LOCK_active_mi);
2675
    res = change_master(thd,active_mi);
2676
    pthread_mutex_unlock(&LOCK_active_mi);
2677 2678
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2679
  case SQLCOM_SHOW_SLAVE_STAT:
2680
  {
2681 2682
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2683
      goto error;
2684
    pthread_mutex_lock(&LOCK_active_mi);
2685
    res = show_master_info(thd,active_mi);
2686
    pthread_mutex_unlock(&LOCK_active_mi);
2687 2688
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2689
  case SQLCOM_SHOW_MASTER_STAT:
2690
  {
2691 2692
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2693 2694 2695 2696
      goto error;
    res = show_binlog_info(thd);
    break;
  }
peter@mysql.com's avatar
peter@mysql.com committed
2697

2698
  case SQLCOM_LOAD_MASTER_DATA: // sync with master
2699
    if (check_global_access(thd, SUPER_ACL))
2700
      goto error;
2701
    if (end_active_trans(thd))
2702
      goto error;
2703 2704
    else
      res = load_master_data(thd);
2705
    break;
2706
#endif /* HAVE_REPLICATION */
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2707 2708 2709
#ifdef HAVE_INNOBASE_DB
  case SQLCOM_SHOW_INNODB_STATUS:
    {
2710
      if (check_global_access(thd, SUPER_ACL))
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2711 2712 2713 2714
	goto error;
      res = innodb_show_status(thd);
      break;
    }
vtkachenko@intelp4d.mysql.com's avatar
vtkachenko@intelp4d.mysql.com committed
2715 2716 2717
  case SQLCOM_SHOW_MUTEX_STATUS:
    {
      if (check_global_access(thd, SUPER_ACL))
vtkachenko@intelp4d.mysql.com's avatar
vtkachenko@intelp4d.mysql.com committed
2718
        goto error;
vtkachenko@intelp4d.mysql.com's avatar
vtkachenko@intelp4d.mysql.com committed
2719 2720 2721
      res = innodb_mutex_show_status(thd);
      break;
    }
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
2722
#endif
2723
#ifdef HAVE_REPLICATION
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2724
  case SQLCOM_LOAD_MASTER_TABLE:
2725
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2726 2727 2728 2729 2730
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (!first_table->db)
      first_table->db= thd->db;
    if (check_access(thd, CREATE_ACL, first_table->db,
		     &first_table->grant.privilege, 0, 0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2731 2732 2733 2734
      goto error;				/* purecov: inspected */
    if (grant_option)
    {
      /* Check that the first table has CREATE privilege */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2735
      if (check_grant(thd, CREATE_ACL, all_tables, 0, 1, 0))
2736
	goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2737
    }
2738
    if (strlen(first_table->table_name) > NAME_LEN)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2739
    {
2740
      my_error(ER_WRONG_TABLE_NAME, MYF(0), first_table->table_name);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2741 2742
      break;
    }
2743
    pthread_mutex_lock(&LOCK_active_mi);
2744 2745 2746 2747
    /*
      fetch_master_table will send the error to the client on failure.
      Give error if the table already exists.
    */
2748
    if (!fetch_master_table(thd, first_table->db, first_table->table_name,
2749
			    active_mi, 0, 0))
2750
    {
2751
      send_ok(thd);
2752
    }
2753
    pthread_mutex_unlock(&LOCK_active_mi);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2754
    break;
2755
  }
2756
#endif /* HAVE_REPLICATION */
2757

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2758
  case SQLCOM_CREATE_TABLE:
2759
  {
2760
    /* If CREATE TABLE of non-temporary table, do implicit commit */
2761 2762 2763 2764 2765 2766 2767 2768 2769 2770
    if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE))
    {
      if (end_active_trans(thd))
      {
	res= -1;
	break;
      }
    }
    else 
    {
2771 2772
      /* So that CREATE TEMPORARY TABLE gets to binlog at commit/rollback */
      thd->options|= OPTION_STATUS_NO_TRANS_UPDATE;
2773
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2774 2775 2776 2777 2778
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    bool link_to_local;
    // Skip first table, which is the table we are creating
    TABLE_LIST *create_table= lex->unlink_first_table(&link_to_local);
    TABLE_LIST *select_tables= lex->query_tables;
monty@mysql.com's avatar
monty@mysql.com committed
2779

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2780
    if ((res= create_table_precheck(thd, select_tables, create_table)))
monty@mysql.com's avatar
monty@mysql.com committed
2781
      goto end_with_restore_list;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2782

2783 2784 2785
#ifndef HAVE_READLINK
    lex->create_info.data_file_name=lex->create_info.index_file_name=0;
#else
2786
    /* Fix names if symlinked tables */
2787
    if (append_file_to_dir(thd, &lex->create_info.data_file_name,
2788
			   create_table->table_name) ||
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2789
	append_file_to_dir(thd, &lex->create_info.index_file_name,
2790
			   create_table->table_name))
monty@mysql.com's avatar
monty@mysql.com committed
2791
      goto end_with_restore_list;
2792
#endif
2793
    /*
2794
      If we are using SET CHARSET without DEFAULT, add an implicit
2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805
      DEFAULT to not confuse old users. (This may change).
    */
    if ((lex->create_info.used_fields & 
	 (HA_CREATE_USED_DEFAULT_CHARSET | HA_CREATE_USED_CHARSET)) ==
	HA_CREATE_USED_CHARSET)
    {
      lex->create_info.used_fields&= ~HA_CREATE_USED_CHARSET;
      lex->create_info.used_fields|= HA_CREATE_USED_DEFAULT_CHARSET;
      lex->create_info.default_table_charset= lex->create_info.table_charset;
      lex->create_info.table_charset= 0;
    }
2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820
    /*
      The create-select command will open and read-lock the select table
      and then create, open and write-lock the new table. If a global
      read lock steps in, we get a deadlock. The write lock waits for
      the global read lock, while the global read lock waits for the
      select table to be closed. So we wait until the global readlock is
      gone before starting both steps. Note that
      wait_if_global_read_lock() sets a protection against a new global
      read lock when it succeeds. This needs to be released by
      start_waiting_global_read_lock(). We protect the normal CREATE
      TABLE in the same way. That way we avoid that a new table is
      created during a gobal read lock.
    */
    if (wait_if_global_read_lock(thd, 0, 1))
    {
monty@mysql.com's avatar
monty@mysql.com committed
2821 2822
      res= 1;
      goto end_with_restore_list;
2823
    }
2824
    if (select_lex->item_list.elements)		// With select
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2825 2826
    {
      select_result *result;
2827

2828
      select_lex->options|= SELECT_NO_UNLOCK;
2829
      unit->set_limit(select_lex);
2830

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2831
      if (!(res= open_and_lock_tables(thd, select_tables)))
2832
      {
2833 2834 2835 2836 2837 2838 2839
        /*
          Is table which we are changing used somewhere in other parts
          of query
        */
        if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
            unique_table(create_table, select_tables))
        {
2840
          my_error(ER_UPDATE_TABLE_USED, MYF(0), create_table->table_name);
monty@mysql.com's avatar
monty@mysql.com committed
2841 2842
          res= 1;
          goto end_with_restart_wait;
2843
        }
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2844 2845 2846 2847 2848 2849 2850 2851 2852 2853
        /* If we create merge table, we have to test tables in merge, too */
        if (lex->create_info.used_fields & HA_CREATE_USED_UNION)
        {
          TABLE_LIST *tab;
          for (tab= (TABLE_LIST*) lex->create_info.merge_list.first;
               tab;
               tab= tab->next_local)
          {
            if (unique_table(tab, select_tables))
            {
2854
              my_error(ER_UPDATE_TABLE_USED, MYF(0), tab->table_name);
monty@mysql.com's avatar
monty@mysql.com committed
2855 2856
              res= 1;
              goto end_with_restart_wait;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2857 2858 2859
            }
          }
        }
2860

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2861 2862 2863 2864 2865
        if ((result= new select_create(create_table,
				       &lex->create_info,
				       lex->create_list,
				       lex->key_list,
				       select_lex->item_list,
2866 2867
				       lex->duplicates,
				       lex->ignore)))
2868 2869 2870 2871 2872
        {
          /*
            CREATE from SELECT give its SELECT_LEX for SELECT,
            and item_list belong to SELECT
          */
2873
          res= handle_select(thd, lex, result, 0);
2874
          delete result;
2875
        }
monty@mysql.com's avatar
monty@mysql.com committed
2876
	/* reset for PS */
2877 2878
	lex->create_list.empty();
	lex->key_list.empty();
2879 2880
      }
    }
monty@mysql.com's avatar
monty@mysql.com committed
2881
    else
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2882
    {
monty@mysql.com's avatar
monty@mysql.com committed
2883
      /* regular create */
venu@myvenu.com's avatar
venu@myvenu.com committed
2884
      if (lex->name)
monty@mysql.com's avatar
monty@mysql.com committed
2885
        res= mysql_create_like_table(thd, create_table, &lex->create_info, 
venu@myvenu.com's avatar
venu@myvenu.com committed
2886 2887
                                     (Table_ident *)lex->name); 
      else
2888
      {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2889
        res= mysql_create_table(thd, create_table->db,
2890
				create_table->table_name, &lex->create_info,
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2891
				lex->create_list,
monty@mysql.com's avatar
monty@mysql.com committed
2892
				lex->key_list, 0, 0);
2893
      }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2894
      if (!res)
2895
	send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2896
    }
2897

monty@mysql.com's avatar
monty@mysql.com committed
2898
end_with_restart_wait:
2899 2900 2901 2902 2903 2904
    /*
      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);

monty@mysql.com's avatar
monty@mysql.com committed
2905
    /* put tables back for PS rexecuting */
monty@mysql.com's avatar
monty@mysql.com committed
2906
end_with_restore_list:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2907
    lex->link_first_table_back(create_table, link_to_local);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2908
    break;
2909
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2910
  case SQLCOM_CREATE_INDEX:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2911 2912
    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
2913
      goto error; /* purecov: inspected */
2914
    thd->enable_slow_log= opt_log_slow_admin_statements;
2915
    if (end_active_trans(thd))
2916
      goto error;
2917
    else
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2918
      res = mysql_create_index(thd, first_table, lex->key_list);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2919 2920
    break;

2921
#ifdef HAVE_REPLICATION
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2922
  case SQLCOM_SLAVE_START:
2923
  {
2924
    pthread_mutex_lock(&LOCK_active_mi);
2925
    start_slave(thd,active_mi,1 /* net report*/);
2926
    pthread_mutex_unlock(&LOCK_active_mi);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2927
    break;
2928
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2929
  case SQLCOM_SLAVE_STOP:
2930 2931 2932 2933 2934 2935
  /*
    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,
2936
      so it waits for the client thread because t is locked by it.
2937
    - then the client thread does SLAVE STOP.
2938 2939
      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.
2940 2941 2942 2943 2944
    To prevent that, refuse SLAVE STOP if the
    client thread has locked tables
  */
  if (thd->locked_tables || thd->active_transaction())
  {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2945 2946
    my_message(ER_LOCK_OR_ACTIVE_TRANSACTION, ER(ER_LOCK_OR_ACTIVE_TRANSACTION),
               MYF(0));
2947
    goto error;
2948
  }
2949
  {
2950
    pthread_mutex_lock(&LOCK_active_mi);
2951
    stop_slave(thd,active_mi,1/* net report*/);
2952
    pthread_mutex_unlock(&LOCK_active_mi);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2953
    break;
2954
  }
2955
#endif /* HAVE_REPLICATION */
2956

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2957
  case SQLCOM_ALTER_TABLE:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2958
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2959
#if defined(DONT_ALLOW_SHOW_COMMANDS)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2960 2961
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
2962
    goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2963 2964
#else
    {
2965
      ulong priv=0;
Sinisa@sinisa.nasamreza.org's avatar
Sinisa@sinisa.nasamreza.org committed
2966
      if (lex->name && (!lex->name[0] || strlen(lex->name) > NAME_LEN))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2967
      {
2968
	my_error(ER_WRONG_TABLE_NAME, MYF(0), lex->name);
2969
        goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2970
      }
2971
      if (!select_lex->db)
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2972 2973 2974
	select_lex->db= first_table->db;
      if (check_access(thd, ALTER_ACL, first_table->db,
		       &first_table->grant.privilege, 0, 0) ||
hf@deer.(none)'s avatar
hf@deer.(none) committed
2975
	  check_access(thd,INSERT_ACL | CREATE_ACL,select_lex->db,&priv,0,0)||
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2976
	  check_merge_table_access(thd, first_table->db,
2977 2978 2979
				   (TABLE_LIST *)
				   lex->create_info.merge_list.first))
	goto error;				/* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2980 2981
      if (grant_option)
      {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
2982
	if (check_grant(thd, ALTER_ACL, all_tables, 0, UINT_MAX, 0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2983 2984 2985 2986 2987
	  goto error;
	if (lex->name && !test_all_bits(priv,INSERT_ACL | CREATE_ACL))
	{					// Rename of table
	  TABLE_LIST tmp_table;
	  bzero((char*) &tmp_table,sizeof(tmp_table));
2988
	  tmp_table.table_name=lex->name;
2989
	  tmp_table.db=select_lex->db;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2990
	  tmp_table.grant.privilege=priv;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2991 2992
	  if (check_grant(thd, INSERT_ACL | CREATE_ACL, &tmp_table, 0,
			  UINT_MAX, 0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2993 2994 2995
	    goto error;
	}
      }
2996 2997
      /* Don't yet allow changing of symlinks with ALTER TABLE */
      lex->create_info.data_file_name=lex->create_info.index_file_name=0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2998
      /* ALTER TABLE ends previous transaction */
2999
      if (end_active_trans(thd))
3000
	goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3001
      else
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3002
      {
3003
        thd->enable_slow_log= opt_log_slow_admin_statements;
3004
	res= mysql_alter_table(thd, select_lex->db, lex->name,
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3005
			       &lex->create_info,
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3006
			       first_table, lex->create_list,
3007
			       lex->key_list,
3008
			       select_lex->order_list.elements,
3009
                               (ORDER *) select_lex->order_list.first,
monty@mysql.com's avatar
monty@mysql.com committed
3010 3011
			       lex->duplicates, lex->ignore, &lex->alter_info,
                               1);
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3012
      }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3013 3014
      break;
    }
hf@deer.(none)'s avatar
hf@deer.(none) committed
3015
#endif /*DONT_ALLOW_SHOW_COMMANDS*/
3016
  case SQLCOM_RENAME_TABLE:
3017
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3018
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3019
    TABLE_LIST *table;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3020
    if (check_db_used(thd, all_tables))
3021
      goto error;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3022
    for (table= first_table; table; table= table->next_local->next_local)
3023
    {
monty@donna.mysql.com's avatar
monty@donna.mysql.com committed
3024
      if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
hf@deer.(none)'s avatar
hf@deer.(none) committed
3025
		       &table->grant.privilege,0,0) ||
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3026 3027
	  check_access(thd, INSERT_ACL | CREATE_ACL, table->next_local->db,
		       &table->next_local->grant.privilege, 0, 0))
3028 3029 3030
	goto error;
      if (grant_option)
      {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3031
	TABLE_LIST old_list, new_list;
3032 3033 3034 3035
	/*
	  we do not need initialize old_list and new_list because we will
	  come table[0] and table->next[0] there
	*/
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3036 3037 3038 3039
	old_list= table[0];
	new_list= table->next_local[0];
	if (check_grant(thd, ALTER_ACL, &old_list, 0, 1, 0) ||
	    (!test_all_bits(table->next_local->grant.privilege,
3040
			    INSERT_ACL | CREATE_ACL) &&
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3041
	     check_grant(thd, INSERT_ACL | CREATE_ACL, &new_list, 0, 1, 0)))
3042 3043 3044
	  goto error;
      }
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3045
    query_cache_invalidate3(thd, first_table, 0);
3046 3047
    if (end_active_trans(thd) || mysql_rename_tables(thd, first_table))
      goto error;
3048
    break;
3049
  }
3050
#ifndef EMBEDDED_LIBRARY
3051 3052
  case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3053 3054
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
3055
    goto error;
3056 3057
#else
    {
3058
      if (check_global_access(thd, SUPER_ACL))
3059 3060 3061 3062
	goto error;
      res = show_binlogs(thd);
      break;
    }
peter@mysql.com's avatar
peter@mysql.com committed
3063
#endif
3064
#endif /* EMBEDDED_LIBRARY */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3065
  case SQLCOM_SHOW_CREATE:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3066
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3067
#ifdef DONT_ALLOW_SHOW_COMMANDS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3068 3069
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0)); /* purecov: inspected */
3070
    goto error;
3071
#else
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3072
    {
3073 3074 3075 3076
      /* Ignore temporary tables if this is "SHOW CREATE VIEW" */
      if (lex->only_view)
        first_table->skip_temporary= 1;

bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3077 3078 3079
      if (check_db_used(thd, all_tables) ||
	  check_access(thd, SELECT_ACL | EXTRA_ACL, first_table->db,
		       &first_table->grant.privilege, 0, 0))
3080
	goto error;
monty@mishka.local's avatar
monty@mishka.local committed
3081
      if (grant_option && check_grant(thd, SELECT_ACL, all_tables, 2, UINT_MAX, 0))
3082
	goto error;
monty@mishka.local's avatar
monty@mishka.local committed
3083
      res= mysqld_show_create(thd, first_table);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3084 3085
      break;
    }
3086
#endif
3087 3088
  case SQLCOM_CHECKSUM:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3089 3090 3091
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL | EXTRA_ACL, all_tables, 0))
3092
      goto error; /* purecov: inspected */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3093
    res = mysql_checksum_table(thd, first_table, &lex->check_opt);
3094 3095
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3096
  case SQLCOM_REPAIR:
3097
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3098 3099 3100
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
3101
      goto error; /* purecov: inspected */
3102
    thd->enable_slow_log= opt_log_slow_admin_statements;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3103
    res= mysql_repair_table(thd, first_table, &lex->check_opt);
3104 3105 3106 3107 3108
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      if (mysql_bin_log.is_open())
      {
3109
	thd->clear_error(); // No binlog error generated
3110
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3111 3112 3113
        mysql_bin_log.write(&qinfo);
      }
    }
3114 3115
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3116
  case SQLCOM_CHECK:
3117
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3118 3119 3120
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL | EXTRA_ACL , all_tables, 0))
3121
      goto error; /* purecov: inspected */
3122
    thd->enable_slow_log= opt_log_slow_admin_statements;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3123
    res = mysql_check_table(thd, first_table, &lex->check_opt);
3124 3125
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3126 3127
  case SQLCOM_ANALYZE:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3128 3129 3130
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3131
      goto error; /* purecov: inspected */
3132
    thd->enable_slow_log= opt_log_slow_admin_statements;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3133
    res = mysql_analyze_table(thd, first_table, &lex->check_opt);
3134 3135 3136 3137 3138
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      if (mysql_bin_log.is_open())
      {
3139
	thd->clear_error(); // No binlog error generated
3140
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3141 3142 3143
        mysql_bin_log.write(&qinfo);
      }
    }
3144
    break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3145
  }
3146

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3147 3148
  case SQLCOM_OPTIMIZE:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3149 3150 3151
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3152
      goto error; /* purecov: inspected */
3153
    thd->enable_slow_log= opt_log_slow_admin_statements;
3154
    res= (specialflag & (SPECIAL_SAFE_MODE | SPECIAL_NO_NEW_FUNC)) ?
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3155 3156
      mysql_recreate_table(thd, first_table, 1) :
      mysql_optimize_table(thd, first_table, &lex->check_opt);
3157 3158 3159 3160 3161
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      if (mysql_bin_log.is_open())
      {
3162
	thd->clear_error(); // No binlog error generated
3163
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3164 3165 3166
        mysql_bin_log.write(&qinfo);
      }
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3167 3168 3169
    break;
  }
  case SQLCOM_UPDATE:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3170 3171
    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
3172
      break;
3173 3174
    DBUG_ASSERT(select_lex->offset_limit == 0);
    unit->set_limit(select_lex);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3175 3176 3177 3178 3179 3180
    res= (result= mysql_update(thd, all_tables,
                               select_lex->item_list,
                               lex->value_list,
                               select_lex->where,
                               select_lex->order_list.elements,
                               (ORDER *) select_lex->order_list.first,
3181
                               unit->select_limit_cnt,
3182
                               lex->duplicates, lex->ignore));
3183
    /* mysql_update return 2 if we need to switch to multi-update */
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3184
    if (result != 2)
3185
      break;
3186
  case SQLCOM_UPDATE_MULTI:
3187
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3188
      DBUG_ASSERT(first_table == all_tables && first_table != 0);
3189
      /* if we switched from normal update, rights are checked */
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202
      if (result != 2)
      {
        if ((res= multi_update_precheck(thd, all_tables)))
          break;
      }
      else
        res= 0;

      res= mysql_multi_update(thd, all_tables,
                              &select_lex->item_list,
                              &lex->value_list,
                              select_lex->where,
                              select_lex->options,
3203
                              lex->duplicates, lex->ignore, unit, select_lex);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3204
    break;
monty@mysql.com's avatar
monty@mysql.com committed
3205
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3206
  case SQLCOM_REPLACE:
3207 3208
  case SQLCOM_INSERT:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3209
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
monty@mysql.com's avatar
monty@mysql.com committed
3210
    if ((res= insert_precheck(thd, all_tables)))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3211
      break;
3212 3213
    /* Skip first table, which is the table we are inserting in */
    select_lex->context.table_list= first_table->next_local;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3214
    res= mysql_insert(thd, all_tables, lex->field_list, lex->many_values,
monty@mishka.local's avatar
monty@mishka.local committed
3215
		      lex->update_list, lex->value_list,
3216
                      lex->duplicates, lex->ignore);
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3217 3218
    if (first_table->view && !first_table->contain_auto_increment)
      thd->last_insert_id= 0; // do not show last insert ID if VIEW have not it
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3219
    break;
3220
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3221 3222 3223
  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
  {
monty@mysql.com's avatar
monty@mysql.com committed
3224
    select_result *result;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3225
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
monty@mishka.local's avatar
monty@mishka.local committed
3226
    if ((res= insert_precheck(thd, all_tables)))
3227
      break;
monty@mysql.com's avatar
monty@mysql.com committed
3228

3229
    /* Fix lock for first table */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3230 3231
    if (first_table->lock_type == TL_WRITE_DELAYED)
      first_table->lock_type= TL_WRITE;
3232

3233 3234
    /* 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
3235

3236
    unit->set_limit(select_lex);
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3237
    if (!(res= open_and_lock_tables(thd, all_tables)))
3238
    {
3239
      /* Skip first table, which is the table we are inserting in */
msvensson@neptunus.(none)'s avatar
msvensson@neptunus.(none) committed
3240
      select_lex->table_list.first= (byte*)first_table->next_local;
3241

3242
      res= mysql_insert_select_prepare(thd);
3243
      lex->select_lex.context.table_list= first_table->next_local;
3244 3245
      if (!res && (result= new select_insert(first_table, first_table->table,
                                             &lex->field_list,
3246 3247
                                             &lex->update_list,
                                             &lex->value_list,
3248
                                             lex->duplicates, lex->ignore)))
3249
      {
3250 3251 3252
        /* Skip first table, which is the table we are inserting in */
        select_lex->context.table_list= first_table->next_local;

3253
	res= handle_select(thd, lex, result, OPTION_SETUP_TABLES_DONE);
3254 3255
        delete result;
      }
3256
      /* revert changes for SP */
msvensson@neptunus.(none)'s avatar
msvensson@neptunus.(none) committed
3257
      select_lex->table_list.first= (byte*) first_table;
3258
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3259 3260 3261

    if (first_table->view && !first_table->contain_auto_increment)
      thd->last_insert_id= 0; // do not show last insert ID if VIEW have not it
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3262 3263
    break;
  }
3264
  case SQLCOM_TRUNCATE:
3265 3266 3267 3268 3269
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3270 3271
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_one_table_access(thd, DELETE_ACL, all_tables))
3272
      goto error;
3273 3274 3275 3276
    /*
      Don't allow this within a transaction because we want to use
      re-generate table
    */
3277
    if ((thd->locked_tables && !lex->sphead) || thd->active_transaction())
3278
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3279 3280
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3281 3282
      goto error;
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3283

monty@mysql.com's avatar
monty@mysql.com committed
3284
    res= mysql_truncate(thd, first_table, 0);
3285
    break;
3286
  case SQLCOM_DELETE:
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3287
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3288 3289
    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
3290
      break;
3291 3292
    DBUG_ASSERT(select_lex->offset_limit == 0);
    unit->set_limit(select_lex);
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3293
    res = mysql_delete(thd, all_tables, select_lex->where,
3294
                       &select_lex->order_list,
3295
                       unit->select_limit_cnt, select_lex->options);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3296 3297
    break;
  }
3298
  case SQLCOM_DELETE_MULTI:
3299
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3300
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3301 3302
    TABLE_LIST *aux_tables=
      (TABLE_LIST *)thd->lex->auxilliary_table_list.first;
3303
    multi_delete *result;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3304

3305
    if ((res= multi_delete_precheck(thd, all_tables)))
3306
      break;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3307

3308
    /* condition will be TRUE on SP re-excuting */
3309 3310
    if (select_lex->item_list.elements != 0)
      select_lex->item_list.empty();
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
3311
    if (add_item_to_list(thd, new Item_null()))
3312
      goto error;
3313

3314
    thd->proc_info="init";
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3315 3316 3317 3318
    if ((res= open_and_lock_tables(thd, all_tables)))
      break;

    if ((res= mysql_multi_delete_prepare(thd)))
3319
      goto error;
3320

3321
    if (!thd->is_fatal_error && (result= new multi_delete(thd,aux_tables,
3322
							  lex->table_count)))
3323
    {
3324 3325 3326
      res= mysql_select(thd, &select_lex->ref_pointer_array,
			select_lex->get_table_list(),
			select_lex->with_wild,
3327
			select_lex->item_list,
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3328
			select_lex->where,
3329
			0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3330 3331
			(ORDER *)NULL,
			select_lex->options | thd->options |
3332 3333
			SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK |
                        OPTION_SETUP_TABLES_DONE,
3334
			result, unit, select_lex);
3335
      delete result;
3336 3337
    }
    else
3338
      res= TRUE;                                // Error
3339 3340
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3341
  case SQLCOM_DROP_TABLE:
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
3342
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3343
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3344 3345
    if (!lex->drop_temporary)
    {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3346
      if (check_table_access(thd, DROP_ACL, all_tables, 0))
3347 3348
	goto error;				/* purecov: inspected */
      if (end_active_trans(thd))
3349
        goto error;
3350
    }
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
3351
    else
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
3352 3353 3354 3355 3356 3357
    {
      /*
	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
3358 3359
	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
3360 3361 3362
      */
      if (thd->slave_thread)
	lex->drop_if_exists= 1;
3363

3364 3365
      /* So that DROP TEMPORARY TABLE gets to binlog at commit/rollback */
      thd->options|= OPTION_STATUS_NO_TRANS_UPDATE;
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
3366
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3367 3368
    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
3369 3370
  }
  break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3371
  case SQLCOM_DROP_INDEX:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3372 3373
    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
3374
      goto error;				/* purecov: inspected */
3375
    if (end_active_trans(thd))
3376
      goto error;
3377
    else
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3378
      res = mysql_drop_index(thd, first_table, &lex->alter_info);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3379 3380
    break;
  case SQLCOM_SHOW_PROCESSLIST:
3381
    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3382
      break;
hf@deer.(none)'s avatar
hf@deer.(none) committed
3383 3384
    mysqld_list_processes(thd,
			  thd->master_access & PROCESS_ACL ? NullS :
monty@mysql.com's avatar
monty@mysql.com committed
3385
			  thd->priv_user,lex->verbose);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3386
    break;
3387 3388
  case SQLCOM_SHOW_STORAGE_ENGINES:
    res= mysqld_show_storage_engines(thd);
3389 3390 3391 3392 3393 3394 3395
    break;
  case SQLCOM_SHOW_PRIVILEGES:
    res= mysqld_show_privileges(thd);
    break;
  case SQLCOM_SHOW_COLUMN_TYPES:
    res= mysqld_show_column_types(thd);
    break;
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
3396 3397
  case SQLCOM_SHOW_LOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3398 3399
    my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND),
               MYF(0));	/* purecov: inspected */
3400
    goto error;
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
3401 3402
#else
    {
hf@deer.(none)'s avatar
hf@deer.(none) committed
3403
      if (grant_option && check_access(thd, FILE_ACL, any_db,0,0,0))
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
3404 3405 3406 3407
	goto error;
      res= mysqld_show_logs(thd);
      break;
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3408 3409
#endif
  case SQLCOM_CHANGE_DB:
3410
    mysql_change_db(thd,select_lex->db);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3411
    break;
3412

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3413 3414
  case SQLCOM_LOAD:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3415
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3416
    uint privilege= (lex->duplicates == DUP_REPLACE ?
3417 3418
		     INSERT_ACL | DELETE_ACL : INSERT_ACL) |
                    (lex->local_file ? 0 : FILE_ACL);
3419

3420
    if (lex->local_file)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3421
    {
3422
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
3423
	  ! opt_local_infile)
3424
      {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3425
	my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND), MYF(0));
3426 3427
	goto error;
      }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3428
    }
3429 3430 3431 3432

    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
3433
    res= mysql_load(thd, lex->exchange, first_table, lex->field_list,
3434
                    lex->update_list, lex->value_list, lex->duplicates,
3435
                    lex->ignore, (bool) lex->local_file);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3436 3437
    break;
  }
3438

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3439
  case SQLCOM_SET_OPTION:
3440 3441
  {
    List<set_var_base> *lex_var_list= &lex->var_list;
3442
    if ((check_table_access(thd, SELECT_ACL, all_tables, 0) ||
3443 3444
	 open_and_lock_tables(thd, all_tables)))
      goto error;
3445 3446
    if (lex->one_shot_set && not_all_support_one_shot(lex_var_list))
    {
3447 3448
      my_error(ER_RESERVED_SYNTAX, MYF(0), "SET ONE_SHOT");
      goto error;
3449 3450 3451 3452 3453 3454 3455 3456
    }
    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;
3457
      send_ok(thd);
3458
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3459
    break;
3460
  }
3461

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3462
  case SQLCOM_UNLOCK_TABLES:
3463 3464 3465 3466 3467 3468
    /*
      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.
    */
3469
    unlock_locked_tables(thd);
3470 3471
    if (thd->options & OPTION_TABLE_LOCK)
    {
3472
      end_active_trans(thd);
3473
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3474 3475
    }
    if (thd->global_read_lock)
3476
      unlock_global_read_lock(thd);
3477
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3478 3479
    break;
  case SQLCOM_LOCK_TABLES:
3480
    unlock_locked_tables(thd);
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3481
    if (check_db_used(thd, all_tables) || end_active_trans(thd))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3482
      goto error;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3483
    if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, all_tables, 0))
3484
      goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3485
    thd->in_lock_tables=1;
3486
    thd->options|= OPTION_TABLE_LOCK;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3487

3488
    if (!(res= simple_open_n_lock_tables(thd, all_tables)))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3489
    {
3490 3491
#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
3492
	query_cache.invalidate_locked_for_write(first_table);
3493
#endif /*HAVE_QUERY_CACHE*/
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3494 3495
      thd->locked_tables=thd->lock;
      thd->lock=0;
3496
      send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3497
    }
3498 3499
    else
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3500 3501 3502
    thd->in_lock_tables=0;
    break;
  case SQLCOM_CREATE_DB:
3503
  {
3504 3505 3506 3507 3508
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
3509
    char *alias;
vva@eagle.mysql.r18.ru's avatar
vva@eagle.mysql.r18.ru committed
3510
    if (!(alias=thd->strdup(lex->name)) || check_db_name(lex->name))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3511
    {
3512
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3513 3514
      break;
    }
3515 3516 3517
    /*
      If in a slave thread :
      CREATE DATABASE DB was certainly not preceded by USE DB.
3518
      For that reason, db_ok() in sql/slave.cc did not check the
3519 3520 3521
      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.
    */
3522
#ifdef HAVE_REPLICATION
3523
    if (thd->slave_thread &&
3524 3525
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3526
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3527
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
3528
      break;
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3529
    }
3530
#endif
hf@deer.(none)'s avatar
hf@deer.(none) committed
3531
    if (check_access(thd,CREATE_ACL,lex->name,0,1,0))
3532
      break;
monty@mysql.com's avatar
monty@mysql.com committed
3533
    res= mysql_create_db(thd,(lower_case_table_names == 2 ? alias : lex->name),
monty@mysql.com's avatar
monty@mysql.com committed
3534
			 &lex->create_info, 0);
3535 3536
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3537
  case SQLCOM_DROP_DB:
3538
  {
3539 3540 3541 3542 3543
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
3544
    if (check_db_name(lex->name))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3545
    {
3546
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3547 3548
      break;
    }
3549 3550 3551 3552 3553 3554 3555
    /*
      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.
    */
3556
#ifdef HAVE_REPLICATION
3557 3558 3559
    if (thd->slave_thread && 
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3560
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3561
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
3562
      break;
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3563
    }
3564
#endif
hf@deer.(none)'s avatar
hf@deer.(none) committed
3565
    if (check_access(thd,DROP_ACL,lex->name,0,1,0))
3566
      break;
3567 3568
    if (thd->locked_tables || thd->active_transaction())
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3569 3570
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3571 3572
      goto error;
    }
3573
    res= mysql_rm_db(thd, lex->name, lex->drop_if_exists, 0);
3574 3575
    break;
  }
3576 3577
  case SQLCOM_ALTER_DB:
  {
3578 3579
    char *db= lex->name ? lex->name : thd->db;
    if (!db)
3580
    {
monty@mishka.local's avatar
monty@mishka.local committed
3581 3582
      my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
      break;
3583 3584
    }
    if (!strip_sp(db) || check_db_name(db))
3585
    {
3586
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
3587 3588
      break;
    }
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3589 3590 3591
    /*
      If in a slave thread :
      ALTER DATABASE DB may not be preceded by USE DB.
3592
      For that reason, maybe db_ok() in sql/slave.cc did not check the
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3593 3594 3595 3596
      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
3597
    if (thd->slave_thread &&
3598 3599
	(!db_ok(db, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(db)))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3600
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3601
      my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0));
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3602 3603 3604
      break;
    }
#endif
3605
    if (check_access(thd, ALTER_ACL, db, 0, 1, 0))
3606 3607 3608
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3609 3610
      my_message(ER_LOCK_OR_ACTIVE_TRANSACTION,
                 ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0));
3611 3612
      goto error;
    }
3613
    res= mysql_alter_db(thd, db, &lex->create_info);
3614 3615
    break;
  }
3616 3617 3618 3619
  case SQLCOM_SHOW_CREATE_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
3620
      my_error(ER_WRONG_DB_NAME, MYF(0), lex->name);
3621 3622
      break;
    }
vva@eagle.mysql.r18.ru's avatar
vva@eagle.mysql.r18.ru committed
3623
    if (check_access(thd,SELECT_ACL,lex->name,0,1,0))
3624
      break;
3625
    res=mysqld_show_create_db(thd,lex->name,&lex->create_info);
3626 3627
    break;
  }
monty@mysql.com's avatar
monty@mysql.com committed
3628
  case SQLCOM_CREATE_FUNCTION:                  // UDF function
monty@mysql.com's avatar
monty@mysql.com committed
3629 3630 3631
  {
    if (check_access(thd,INSERT_ACL,"mysql",0,1,0))
      break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3632
#ifdef HAVE_DLOPEN
3633
    if (sp_find_function(thd, lex->spname))
monty@mysql.com's avatar
monty@mysql.com committed
3634
    {
3635
      my_error(ER_UDF_EXISTS, MYF(0), lex->spname->m_name.str);
monty@mysql.com's avatar
monty@mysql.com committed
3636 3637
      goto error;
    }
3638
    if (!(res = mysql_create_function(thd, &lex->udf)))
monty@mysql.com's avatar
monty@mysql.com committed
3639
      send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3640
#else
hf@deer.(none)'s avatar
hf@deer.(none) committed
3641
    net_printf_error(thd, ER_CANT_OPEN_LIBRARY, lex->udf.dl, 0, "feature disabled");
3642
    res= TRUE;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3643 3644
#endif
    break;
monty@mysql.com's avatar
monty@mysql.com committed
3645
  }
hf@deer.(none)'s avatar
hf@deer.(none) committed
3646
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3647 3648
  case SQLCOM_CREATE_USER:
  {
3649 3650
    if (check_access(thd, INSERT_ACL, "mysql", 0, 1, 1) &&
        check_global_access(thd,CREATE_USER_ACL))
3651 3652 3653 3654 3655
      break;
    if (!(res= mysql_create_user(thd, lex->users_list)))
    {
      if (mysql_bin_log.is_open())
      {
monty@mysql.com's avatar
monty@mysql.com committed
3656
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3657 3658 3659 3660 3661 3662
        mysql_bin_log.write(&qinfo);
      }
      send_ok(thd);
    }
    break;
  }
3663 3664
  case SQLCOM_DROP_USER:
  {
3665 3666
    if (check_access(thd, DELETE_ACL, "mysql", 0, 1, 1) &&
        check_global_access(thd,CREATE_USER_ACL))
3667 3668 3669 3670 3671
      break;
    if (!(res= mysql_drop_user(thd, lex->users_list)))
    {
      if (mysql_bin_log.is_open())
      {
monty@mysql.com's avatar
monty@mysql.com committed
3672
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3673 3674 3675 3676 3677 3678 3679 3680
        mysql_bin_log.write(&qinfo);
      }
      send_ok(thd);
    }
    break;
  }
  case SQLCOM_RENAME_USER:
  {
3681 3682
    if (check_access(thd, UPDATE_ACL, "mysql", 0, 1, 1) &&
        check_global_access(thd,CREATE_USER_ACL))
3683 3684 3685 3686 3687
      break;
    if (!(res= mysql_rename_user(thd, lex->users_list)))
    {
      if (mysql_bin_log.is_open())
      {
monty@mysql.com's avatar
monty@mysql.com committed
3688
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3689
        mysql_bin_log.write(&qinfo);
3690 3691 3692 3693 3694 3695 3696
      }
      send_ok(thd);
    }
    break;
  }
  case SQLCOM_REVOKE_ALL:
  {
3697 3698
    if (check_access(thd, UPDATE_ACL, "mysql", 0, 1, 1) &&
        check_global_access(thd,CREATE_USER_ACL))
3699 3700 3701 3702 3703
      break;
    if (!(res = mysql_revoke_all(thd, lex->users_list)))
    {
      if (mysql_bin_log.is_open())
      {
3704
	Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3705 3706 3707 3708 3709 3710
	mysql_bin_log.write(&qinfo);
      }
      send_ok(thd);
    }
    break;
  }
3711 3712 3713 3714
  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
3715
		     first_table ?  first_table->db : select_lex->db,
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3716 3717
		     first_table ? &first_table->grant.privilege : 0,
		     first_table ? 0 : 1, 0))
3718 3719
      goto error;

3720 3721 3722
    if (thd->user)				// If not replication
    {
      LEX_USER *user;
3723 3724
      uint counter;

3725
      List_iterator <LEX_USER> user_list(lex->users_list);
3726
      while ((user= user_list++))
3727
      {
3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748
        if (specialflag & SPECIAL_NO_RESOLVE &&
            hostname_requires_resolving(user->host.str))
          push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                              ER_WARN_HOSTNAME_WONT_WORK,
                              ER(ER_WARN_HOSTNAME_WONT_WORK),
                              user->host.str);
        // Are we trying to change a password of another user
        DBUG_ASSERT(user->host.str != 0);
        if (strcmp(thd->user, user->user.str) ||
            my_strcasecmp(system_charset_info,
                          user->host.str, thd->host_or_ip))
        {
          // TODO: use check_change_password()
          if (check_acl_user(user, &counter) && user->password.str &&
              check_access(thd, UPDATE_ACL,"mysql",0,1,1))
          {
            my_message(ER_PASSWORD_NOT_ALLOWED,
                       ER(ER_PASSWORD_NOT_ALLOWED), MYF(0));
            goto error;
          }
        }
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
3749 3750
      }
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3751
    if (first_table)
3752
    {
3753 3754
      if (lex->type == TYPE_ENUM_PROCEDURE ||
          lex->type == TYPE_ENUM_FUNCTION)
3755 3756 3757 3758 3759
      {
        uint grants= lex->all_privileges 
		   ? (PROC_ACLS & ~GRANT_ACL) | (lex->grant & GRANT_ACL)
		   : lex->grant;
        if (grant_option && 
3760 3761
	    check_grant_routine(thd, grants | GRANT_ACL, all_tables,
                                lex->type == TYPE_ENUM_PROCEDURE, 0))
3762
	  goto error;
3763 3764 3765 3766
        res= mysql_routine_grant(thd, all_tables,
                                 lex->type == TYPE_ENUM_PROCEDURE, 
                                 lex->users_list, grants,
                                 lex->sql_command == SQLCOM_REVOKE, 0);
3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779
      }
      else
      {
	if (grant_option && check_grant(thd,
					(lex->grant | lex->grant_tot_col |
					 GRANT_ACL),
					all_tables, 0, UINT_MAX, 0))
	  goto error;
        res= mysql_table_grant(thd, all_tables, lex->users_list,
			       lex->columns, lex->grant,
			       lex->sql_command == SQLCOM_REVOKE);
      }
      if (!res && mysql_bin_log.is_open())
3780
      {
pem@mysql.com's avatar
pem@mysql.com committed
3781
        thd->clear_error();
monty@mysql.com's avatar
monty@mysql.com committed
3782
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3783
        mysql_bin_log.write(&qinfo);
3784 3785 3786 3787
      }
    }
    else
    {
3788
      if (lex->columns.elements || lex->type)
3789
      {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3790 3791
	my_message(ER_ILLEGAL_GRANT_FOR_TABLE, ER(ER_ILLEGAL_GRANT_FOR_TABLE),
                   MYF(0));
3792
        goto error;
3793 3794 3795 3796 3797 3798 3799 3800
      }
      else
	res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
			  lex->sql_command == SQLCOM_REVOKE);
      if (!res)
      {
	if (mysql_bin_log.is_open())
	{
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3801
          thd->clear_error();
3802
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3803 3804
	  mysql_bin_log.write(&qinfo);
	}
3805
	if (lex->sql_command == SQLCOM_GRANT)
3806
	{
3807 3808 3809
	  List_iterator <LEX_USER> str_list(lex->users_list);
	  LEX_USER *user;
	  while ((user=str_list++))
monty@mysql.com's avatar
monty@mysql.com committed
3810
	    reset_mqh(user);
3811
	}
3812 3813 3814 3815
      }
    }
    break;
  }
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
3816
#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/
monty@donna.mysql.com's avatar
monty@donna.mysql.com committed
3817
  case SQLCOM_RESET:
3818 3819 3820
    /*
      RESET commands are never written to the binary log, so we have to
      initialize this variable because RESET shares the same code as FLUSH
3821 3822 3823 3824
    */
    lex->no_write_to_binlog= 1;
  case SQLCOM_FLUSH:
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3825
    if (check_global_access(thd,RELOAD_ACL) || check_db_used(thd, all_tables))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3826
      goto error;
3827 3828 3829 3830 3831
    /*
      reload_acl_and_cache() will tell us if we are allowed to write to the
      binlog or not.
    */
    bool write_to_binlog;
3832
    if (!reload_acl_and_cache(thd, lex->type, first_table, &write_to_binlog))
3833 3834 3835 3836 3837 3838 3839 3840 3841
    {
      /*
        We WANT to write and we CAN write.
        ! we write after unlocking the table.
      */
      if (!lex->no_write_to_binlog && write_to_binlog)
      {
        if (mysql_bin_log.is_open())
        {
3842
          Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3843 3844 3845 3846 3847
          mysql_bin_log.write(&qinfo);
        }
      }
      send_ok(thd);
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3848
    break;
3849
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3850
  case SQLCOM_KILL:
3851 3852 3853
  {
    Item *it= (Item *)lex->value_list.head();

3854
    if ((!it->fixed && it->fix_fields(lex->thd, &it)) || it->check_cols(1))
3855 3856 3857 3858 3859 3860
    {
      my_message(ER_SET_CONSTANTS_ONLY, ER(ER_SET_CONSTANTS_ONLY),
		 MYF(0));
      goto error;
    }
    kill_one_thread(thd, (ulong)it->val_int(), lex->type & ONLY_KILL_QUERY);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3861
    break;
3862
  }
hf@deer.(none)'s avatar
hf@deer.(none) committed
3863
#ifndef NO_EMBEDDED_ACCESS_CHECKS
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3864
  case SQLCOM_SHOW_GRANTS:
3865 3866
    if ((thd->priv_user &&
	 !strcmp(thd->priv_user,lex->grant_user->user.str)) ||
hf@deer.(none)'s avatar
hf@deer.(none) committed
3867
	!check_access(thd, SELECT_ACL, "mysql",0,1,0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3868 3869 3870 3871
    {
      res = mysql_show_grants(thd,lex->grant_user);
    }
    break;
hf@deer.(none)'s avatar
hf@deer.(none) committed
3872
#endif
3873
  case SQLCOM_HA_OPEN:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3874 3875 3876
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables) ||
	check_table_access(thd, SELECT_ACL, all_tables, 0))
3877
      goto error;
monty@mysql.com's avatar
monty@mysql.com committed
3878
    res= mysql_ha_open(thd, first_table, 0);
3879 3880
    break;
  case SQLCOM_HA_CLOSE:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3881 3882
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
    if (check_db_used(thd, all_tables))
3883
      goto error;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3884
    res= mysql_ha_close(thd, first_table);
3885 3886
    break;
  case SQLCOM_HA_READ:
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3887
    DBUG_ASSERT(first_table == all_tables && first_table != 0);
3888 3889 3890 3891 3892
    /*
      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.
    */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3893
    if (check_db_used(thd, all_tables))
3894
      goto error;
3895
    unit->set_limit(select_lex);
3896
    res= mysql_ha_read(thd, first_table, lex->ha_read_mode, lex->ident.str,
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
3897
                       lex->insert_list, lex->ha_rkey_mode, select_lex->where,
3898
                       unit->select_limit_cnt, unit->offset_limit_cnt);
3899 3900
    break;

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3901
  case SQLCOM_BEGIN:
3902
    if (begin_trans(thd))
3903
      goto error;
serg@serg.mylan's avatar
serg@serg.mylan committed
3904
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3905 3906
    break;
  case SQLCOM_COMMIT:
3907
    if (end_trans(thd, lex->tx_release ? COMMIT_RELEASE :
serg@serg.mylan's avatar
serg@serg.mylan committed
3908
                              lex->tx_chain ? COMMIT_AND_CHAIN : COMMIT))
3909
      goto error;
3910
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3911 3912
    break;
  case SQLCOM_ROLLBACK:
3913
    if (end_trans(thd, lex->tx_release ? ROLLBACK_RELEASE :
serg@serg.mylan's avatar
serg@serg.mylan committed
3914
                              lex->tx_chain ? ROLLBACK_AND_CHAIN : ROLLBACK))
3915
      goto error;
3916
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3917
    break;
serg@serg.mylan's avatar
serg@serg.mylan committed
3918
  case SQLCOM_RELEASE_SAVEPOINT:
serg@serg.mylan's avatar
serg@serg.mylan committed
3919
  {
3920 3921
    SAVEPOINT *sv;
    for (sv=thd->transaction.savepoints; sv; sv=sv->prev)
serg@serg.mylan's avatar
serg@serg.mylan committed
3922 3923 3924
    {
      if (my_strnncoll(system_charset_info,
                       (uchar *)lex->ident.str, lex->ident.length,
3925
                       (uchar *)sv->name, sv->length) == 0)
serg@serg.mylan's avatar
serg@serg.mylan committed
3926 3927
        break;
    }
3928
    if (sv)
serg@serg.mylan's avatar
serg@serg.mylan committed
3929
    {
3930
      if (ha_release_savepoint(thd, sv))
serg@serg.mylan's avatar
serg@serg.mylan committed
3931
        res= TRUE; // cannot happen
serg@serg.mylan's avatar
serg@serg.mylan committed
3932 3933
      else
        send_ok(thd);
3934
      thd->transaction.savepoints=sv->prev;
serg@serg.mylan's avatar
serg@serg.mylan committed
3935
    }
3936
    else
serg@serg.mylan's avatar
serg@serg.mylan committed
3937
      my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3938
    break;
serg@serg.mylan's avatar
serg@serg.mylan committed
3939
  }
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3940
  case SQLCOM_ROLLBACK_TO_SAVEPOINT:
serg@serg.mylan's avatar
serg@serg.mylan committed
3941
  {
3942 3943
    SAVEPOINT *sv;
    for (sv=thd->transaction.savepoints; sv; sv=sv->prev)
3944 3945 3946
    {
      if (my_strnncoll(system_charset_info,
                       (uchar *)lex->ident.str, lex->ident.length,
3947
                       (uchar *)sv->name, sv->length) == 0)
3948 3949
        break;
    }
3950
    if (sv)
3951
    {
3952
      if (ha_rollback_to_savepoint(thd, sv))
3953 3954
        res= TRUE; // cannot happen
      else
serg@serg.mylan's avatar
serg@serg.mylan committed
3955 3956 3957 3958 3959 3960 3961 3962
      {
        if ((thd->options & OPTION_STATUS_NO_TRANS_UPDATE) &&
            !thd->slave_thread)
          push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                       ER_WARNING_NOT_COMPLETE_ROLLBACK,
                       ER(ER_WARNING_NOT_COMPLETE_ROLLBACK));
        send_ok(thd);
      }
3963
      thd->transaction.savepoints=sv;
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3964 3965
    }
    else
3966
      my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3967
    break;
3968
  }
3969
  case SQLCOM_SAVEPOINT:
3970 3971
    if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) ||
        !opt_using_transactions)
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
3972
      send_ok(thd);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3973
    else
3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011
    {
      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);
      }
    }
4012
    break;
4013 4014
  case SQLCOM_CREATE_PROCEDURE:
  case SQLCOM_CREATE_SPFUNCTION:
monty@mysql.com's avatar
monty@mysql.com committed
4015
  {
4016
    uint namelen;
4017
    char *name, *db;
4018
    int result;
4019

4020
    DBUG_ASSERT(lex->sphead != 0);
4021

4022
    if (check_access(thd, CREATE_PROC_ACL, lex->sphead->m_db.str, 0, 0, 0))
4023 4024 4025 4026 4027 4028
    {
      delete lex->sphead;
      lex->sphead= 0;
      goto error;
    }

4029 4030 4031
    if (!lex->sphead->m_db.str || !lex->sphead->m_db.str[0])
    {
      lex->sphead->m_db.length= strlen(thd->db);
serg@serg.mylan's avatar
serg@serg.mylan committed
4032 4033
      lex->sphead->m_db.str= strmake_root(thd->mem_root, thd->db,
                                           lex->sphead->m_db.length);
4034
    }
4035 4036

    name= lex->sphead->name(&namelen);
4037
#ifdef HAVE_DLOPEN
monty@mysql.com's avatar
monty@mysql.com committed
4038 4039 4040
    if (lex->sphead->m_type == TYPE_ENUM_FUNCTION)
    {
      udf_func *udf = find_udf(name, namelen);
4041

monty@mysql.com's avatar
monty@mysql.com committed
4042
      if (udf)
4043
      {
4044
	my_error(ER_UDF_EXISTS, MYF(0), name);
4045
	delete lex->sphead;
4046
	lex->sphead= 0;
4047
	goto error;
4048
      }
monty@mysql.com's avatar
monty@mysql.com committed
4049 4050 4051 4052 4053
    }
#endif
    if (lex->sphead->m_type == TYPE_ENUM_FUNCTION &&
	!lex->sphead->m_has_return)
    {
4054
      my_error(ER_SP_NORETURN, MYF(0), name);
monty@mysql.com's avatar
monty@mysql.com committed
4055
      delete lex->sphead;
4056
      lex->sphead= 0;
monty@mysql.com's avatar
monty@mysql.com committed
4057 4058 4059
      goto error;
    }

4060 4061
    name= thd->strdup(name); 
    db= thd->strmake(lex->sphead->m_db.str, lex->sphead->m_db.length);
4062 4063
    res= (result= lex->sphead->create(thd));
    switch (result) {
monty@mysql.com's avatar
monty@mysql.com committed
4064
    case SP_OK:
4065
      lex->unit.cleanup();
monty@mysql.com's avatar
monty@mysql.com committed
4066 4067
      delete lex->sphead;
      lex->sphead= 0;
4068
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4069
      /* only add privileges if really neccessary */
4070
      if (sp_automatic_privileges && !opt_noacl &&
4071 4072 4073
          check_routine_access(thd, DEFAULT_CREATE_PROC_ACLS,
      			       db, name,
                               lex->sql_command == SQLCOM_CREATE_PROCEDURE, 1))
4074 4075
      {
        close_thread_tables(thd);
4076 4077
        if (sp_grant_privileges(thd, db, name, 
                                lex->sql_command == SQLCOM_CREATE_PROCEDURE))
4078 4079 4080 4081
          push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 
	  	       ER_PROC_AUTO_GRANT_FAIL,
		       ER(ER_PROC_AUTO_GRANT_FAIL));
      }
4082
#endif
4083
      send_ok(thd);
4084
      break;
monty@mysql.com's avatar
monty@mysql.com committed
4085
    case SP_WRITE_ROW_FAILED:
4086
      my_error(ER_SP_ALREADY_EXISTS, MYF(0), SP_TYPE_STRING(lex), name);
4087
      lex->unit.cleanup();
monty@mysql.com's avatar
monty@mysql.com committed
4088 4089 4090
      delete lex->sphead;
      lex->sphead= 0;
      goto error;
4091
    case SP_NO_DB_ERROR:
4092
      my_error(ER_BAD_DB_ERROR, MYF(0), lex->sphead->m_db.str);
4093
      lex->unit.cleanup();
4094 4095 4096
      delete lex->sphead;
      lex->sphead= 0;
      goto error;
4097 4098 4099 4100 4101 4102
    case SP_BAD_IDENTIFIER:
      my_error(ER_TOO_LONG_IDENT, MYF(0), name);
      lex->unit.cleanup();
      delete lex->sphead;
      lex->sphead= 0;
      goto error;
4103 4104 4105
    case SP_BODY_TOO_LONG:
      my_error(ER_TOO_LONG_BODY, MYF(0), name);
      lex->unit.cleanup();
4106 4107 4108
      delete lex->sphead;
      lex->sphead= 0;
      goto error;
monty@mysql.com's avatar
monty@mysql.com committed
4109
    default:
4110
      my_error(ER_SP_STORE_FAILED, MYF(0), SP_TYPE_STRING(lex), name);
4111
      lex->unit.cleanup();
monty@mysql.com's avatar
monty@mysql.com committed
4112 4113 4114
      delete lex->sphead;
      lex->sphead= 0;
      goto error;
4115
    }
monty@mysql.com's avatar
monty@mysql.com committed
4116 4117
    break;
  }
4118 4119 4120 4121
  case SQLCOM_CALL:
    {
      sp_head *sp;

4122 4123 4124 4125 4126 4127 4128 4129 4130
      /*
        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;

      /*
4131 4132
        By this moment all needed SPs should be in cache so no need to look 
        into DB. 
4133 4134
      */
      if (!(sp= sp_find_procedure(thd, lex->spname, TRUE)))
4135
      {
4136
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "PROCEDURE",
4137
                 lex->spname->m_qname.str);
4138
	goto error;
4139 4140 4141
      }
      else
      {
4142
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4143
	st_sp_security_context save_ctx;
4144
#endif
pem@mysql.comhem.se's avatar
pem@mysql.comhem.se committed
4145
	ha_rows select_limit;
monty@mysql.com's avatar
monty@mysql.com committed
4146 4147
        /* bits that should be cleared in thd->server_status */
	uint bits_to_be_cleared= 0;
4148

4149
#ifndef EMBEDDED_LIBRARY
4150 4151
	my_bool nsok= thd->net.no_send_ok;
	thd->net.no_send_ok= TRUE;
4152
#endif
4153
	if (sp->m_multi_results)
4154
	{
4155
	  if (! (thd->client_capabilities & CLIENT_MULTI_RESULTS))
4156
	  {
4157
	    my_error(ER_SP_BADSELECT, MYF(0), sp->m_qname.str);
4158 4159 4160 4161 4162
#ifndef EMBEDDED_LIBRARY
	    thd->net.no_send_ok= nsok;
#endif
	    goto error;
	  }
monty@mysql.com's avatar
monty@mysql.com committed
4163 4164 4165 4166 4167 4168 4169
          /*
            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;
4170 4171
	}

4172
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4173 4174
	if (check_routine_access(thd, EXECUTE_ACL, 
				 sp->m_db.str, sp->m_name.str, TRUE, 0))
4175 4176 4177 4178 4179 4180
	{
#ifndef EMBEDDED_LIBRARY
	  thd->net.no_send_ok= nsok;
#endif
	  goto error;
	}
4181
	sp_change_security_context(thd, sp, &save_ctx);
4182
	if (save_ctx.changed && 
4183 4184
	    check_routine_access(thd, EXECUTE_ACL, 
				   sp->m_db.str, sp->m_name.str, TRUE, 0))
4185 4186 4187 4188 4189 4190 4191 4192
	{
#ifndef EMBEDDED_LIBRARY
	  thd->net.no_send_ok= nsok;
#endif
	  sp_restore_security_context(thd, sp, &save_ctx);
	  goto error;
	}

4193
#endif
pem@mysql.comhem.se's avatar
pem@mysql.comhem.se committed
4194 4195
	select_limit= thd->variables.select_limit;
	thd->variables.select_limit= HA_POS_ERROR;
4196

4197
        thd->row_count_func= 0;
4198
        tmp_disable_binlog(thd); /* don't binlog the substatements */
4199
	res= sp->execute_procedure(thd, &lex->value_list);
4200 4201 4202 4203 4204 4205 4206 4207 4208 4209 4210 4211 4212 4213 4214 4215 4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234
        reenable_binlog(thd);

        /*
          We write CALL to binlog; on the opposite we didn't write the
          substatements. That choice is necessary because the substatements
          may use local vars.
          Binlogging should happen when all tables are locked. They are locked
          just above, and unlocked by close_thread_tables(). All tables which
          are to be updated are locked like with a table-level write lock, and
          this also applies to InnoDB (I tested - note that it reduces
          InnoDB's concurrency as we don't use row-level locks). So binlogging
          below is safe.
          Note the limitation: if the SP returned an error, but still did some
          updates, we do NOT binlog it. This is because otherwise "permission
          denied", "table does not exist" etc would stop the slave quite
          often. There is no easy way to know if the SP updated something
          (even no_trans_update is not suitable, as it may be a transactional
          autocommit update which happened, and no_trans_update covers only
          INSERT/UPDATE/LOAD).
        */
        if (mysql_bin_log.is_open() &&
            (sp->m_chistics->daccess == SP_CONTAINS_SQL ||
             sp->m_chistics->daccess == SP_MODIFIES_SQL_DATA))
        {
          if (res)
            push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                         ER_FAILED_ROUTINE_BREAK_BINLOG,
			 ER(ER_FAILED_ROUTINE_BREAK_BINLOG));
          else
          {
            thd->clear_error();
            Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
            mysql_bin_log.write(&qinfo);
          }
        }
4235

4236 4237 4238
	/*
          If warnings have been cleared, we have to clear total_warn_count
          too, otherwise the clients get confused.
4239 4240 4241 4242
	 */
	if (thd->warn_list.is_empty())
	  thd->total_warn_count= 0;

pem@mysql.comhem.se's avatar
pem@mysql.comhem.se committed
4243
	thd->variables.select_limit= select_limit;
4244
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4245
	sp_restore_security_context(thd, sp, &save_ctx);
4246
#endif
4247

4248
#ifndef EMBEDDED_LIBRARY
4249
	thd->net.no_send_ok= nsok;
4250
#endif
monty@mysql.com's avatar
monty@mysql.com committed
4251
        thd->server_status&= ~bits_to_be_cleared;
4252

4253
	if (!res)
monty@mysql.com's avatar
monty@mysql.com committed
4254 4255
	  send_ok(thd, (ulong) (thd->row_count_func < 0 ? 0 :
                                thd->row_count_func));
4256 4257
	else
	  goto error;		// Substatement should already have sent error
4258
      }
4259
      break;
4260 4261
    }
  case SQLCOM_ALTER_PROCEDURE:
4262
  case SQLCOM_ALTER_FUNCTION:
4263
    {
4264
      int result;
4265 4266 4267 4268
      sp_head *sp;
      st_sp_chistics chistics;

      memcpy(&chistics, &lex->sp_chistics, sizeof(chistics));
4269
      if (lex->sql_command == SQLCOM_ALTER_PROCEDURE)
4270
	sp= sp_find_procedure(thd, lex->spname);
4271
      else
4272
	sp= sp_find_function(thd, lex->spname);
monty@mysql.com's avatar
monty@mysql.com committed
4273
      mysql_reset_errors(thd, 0);
4274
      if (! sp)
4275 4276 4277 4278 4279 4280 4281 4282 4283
      {
	if (lex->spname->m_db.str)
	  result= SP_KEY_NOT_FOUND;
	else
	{
	  my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
	  goto error;
	}
      }
4284 4285
      else
      {
4286 4287 4288
        if (check_routine_access(thd, ALTER_PROC_ACL, sp->m_db.str, 
				 sp->m_name.str,
                                 lex->sql_command == SQLCOM_ALTER_PROCEDURE, 0))
4289
	  goto error;
4290
	memcpy(&lex->sp_chistics, &chistics, sizeof(lex->sp_chistics));
4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306
        if (!trust_routine_creators &&  mysql_bin_log.is_open() &&
            !sp->m_chistics->detistic &&
            (chistics.daccess == SP_CONTAINS_SQL ||
             chistics.daccess == SP_MODIFIES_SQL_DATA))
        {
          my_message(ER_BINLOG_UNSAFE_ROUTINE,
		     ER(ER_BINLOG_UNSAFE_ROUTINE), MYF(0));
          result= SP_INTERNAL_ERROR;
        }
        else
        {
          if (lex->sql_command == SQLCOM_ALTER_PROCEDURE)
            result= sp_update_procedure(thd, lex->spname, &lex->sp_chistics);
          else
            result= sp_update_function(thd, lex->spname, &lex->sp_chistics);
        }
4307
      }
4308
      switch (result)
4309
      {
4310
      case SP_OK:
4311 4312 4313 4314 4315 4316
        if (mysql_bin_log.is_open())
        {
          thd->clear_error();
          Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
          mysql_bin_log.write(&qinfo);
        }
4317
	send_ok(thd);
4318 4319
	break;
      case SP_KEY_NOT_FOUND:
4320 4321
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4322 4323
	goto error;
      default:
4324 4325
	my_error(ER_SP_CANT_ALTER, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4326
	goto error;
4327
      }
4328
      break;
4329 4330
    }
  case SQLCOM_DROP_PROCEDURE:
4331
  case SQLCOM_DROP_FUNCTION:
4332
    {
4333
      sp_head *sp;
4334
      int result;
4335
      char *db, *name;
4336

4337
      if (lex->sql_command == SQLCOM_DROP_PROCEDURE)
4338 4339 4340
	sp= sp_find_procedure(thd, lex->spname);
      else
	sp= sp_find_function(thd, lex->spname);
monty@mysql.com's avatar
monty@mysql.com committed
4341
      mysql_reset_errors(thd, 0);
4342
      if (sp)
4343
      {
4344 4345
        db= thd->strdup(sp->m_db.str);
	name= thd->strdup(sp->m_name.str);
4346 4347
	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
4348
          goto error;
4349
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4350
	if (sp_automatic_privileges && !opt_noacl &&
4351 4352
	    sp_revoke_privileges(thd, db, name, 
                                 lex->sql_command == SQLCOM_DROP_PROCEDURE))
4353 4354 4355 4356 4357
	{
	  push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 
		       ER_PROC_AUTO_REVOKE_FAIL,
		       ER(ER_PROC_AUTO_REVOKE_FAIL));
	}
4358
#endif
4359
	if (lex->sql_command == SQLCOM_DROP_PROCEDURE)
bell@sanja.is.com.ua's avatar
merge  
bell@sanja.is.com.ua committed
4360
	  result= sp_drop_procedure(thd, lex->spname);
4361
	else
bell@sanja.is.com.ua's avatar
merge  
bell@sanja.is.com.ua committed
4362
	  result= sp_drop_function(thd, lex->spname);
4363 4364 4365
      }
      else
      {
4366
#ifdef HAVE_DLOPEN
4367 4368 4369 4370 4371 4372 4373 4374 4375
	if (lex->sql_command == SQLCOM_DROP_FUNCTION)
	{
          udf_func *udf = find_udf(lex->spname->m_name.str,
                                   lex->spname->m_name.length);
          if (udf)
          {
	    if (check_access(thd, DELETE_ACL, "mysql", 0, 1, 0))
	      goto error;
	    if (!(res = mysql_drop_function(thd, &lex->spname->m_name)))
4376
	    {
4377 4378
	      send_ok(thd);
	      break;
4379 4380
	    }
	  }
4381
	}
4382
#endif
4383 4384 4385 4386 4387 4388 4389
	if (lex->spname->m_db.str)
	  result= SP_KEY_NOT_FOUND;
	else
	{
	  my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0));
	  goto error;
	}
4390
      }
4391 4392
      res= result;
      switch (result)
4393 4394
      {
      case SP_OK:
4395 4396 4397 4398 4399 4400
        if (mysql_bin_log.is_open())
        {
          thd->clear_error();
          Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
          mysql_bin_log.write(&qinfo);
        }
4401
	send_ok(thd);
4402 4403
	break;
      case SP_KEY_NOT_FOUND:
4404 4405
	if (lex->drop_if_exists)
	{
4406
	  push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
4407
			      ER_SP_DOES_NOT_EXIST, ER(ER_SP_DOES_NOT_EXIST),
4408
			      SP_COM_STRING(lex), lex->spname->m_name.str);
4409
	  res= FALSE;
4410 4411 4412
	  send_ok(thd);
	  break;
	}
4413 4414
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4415 4416
	goto error;
      default:
4417 4418
	my_error(ER_SP_DROP_FAILED, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_qname.str);
4419
	goto error;
4420
      }
4421
      break;
4422
    }
4423 4424
  case SQLCOM_SHOW_CREATE_PROC:
    {
4425
      if (lex->spname->m_name.length > NAME_LEN)
4426
      {
4427
	my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str);
4428 4429
	goto error;
      }
4430
      if (sp_show_create_procedure(thd, lex->spname) != SP_OK)
4431
      {			/* We don't distinguish between errors for now */
4432 4433
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
4434 4435 4436 4437 4438 4439
	goto error;
      }
      break;
    }
  case SQLCOM_SHOW_CREATE_FUNC:
    {
4440
      if (lex->spname->m_name.length > NAME_LEN)
4441
      {
4442
	my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str);
4443 4444
	goto error;
      }
4445
      if (sp_show_create_function(thd, lex->spname) != SP_OK)
4446
      {			/* We don't distinguish between errors for now */
4447 4448
	my_error(ER_SP_DOES_NOT_EXIST, MYF(0),
                 SP_COM_STRING(lex), lex->spname->m_name.str);
4449 4450 4451 4452 4453 4454
	goto error;
      }
      break;
    }
  case SQLCOM_SHOW_STATUS_PROC:
    {
4455
      res= sp_show_status_procedure(thd, (lex->wild ?
4456 4457 4458 4459 4460
					  lex->wild->ptr() : NullS));
      break;
    }
  case SQLCOM_SHOW_STATUS_FUNC:
    {
4461
      res= sp_show_status_function(thd, (lex->wild ? 
4462 4463 4464
					 lex->wild->ptr() : NullS));
      break;
    }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4465 4466
  case SQLCOM_CREATE_VIEW:
    {
4467 4468 4469
      if (!(res= mysql_create_view(thd, thd->lex->create_view_mode)) &&
          mysql_bin_log.is_open())
      {
4470
        thd->clear_error();
4471 4472 4473
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
        mysql_bin_log.write(&qinfo);
      }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4474 4475 4476 4477
      break;
    }
  case SQLCOM_DROP_VIEW:
    {
4478 4479 4480
      if (check_table_access(thd, DROP_ACL, all_tables, 0) ||
          end_active_trans(thd))
        goto error;
4481 4482 4483
      if (!(res= mysql_drop_view(thd, first_table, thd->lex->drop_mode)) &&
          mysql_bin_log.is_open())
      {
4484
        thd->clear_error();
4485 4486 4487
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
        mysql_bin_log.write(&qinfo);
      }
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4488 4489
      break;
    }
4490 4491
  case SQLCOM_CREATE_TRIGGER:
  {
4492 4493 4494
    res= mysql_create_or_drop_trigger(thd, all_tables, 1);

    /* We don't care about trigger body after this point */
4495 4496 4497 4498 4499 4500 4501 4502 4503
    delete lex->sphead;
    lex->sphead= 0;
    break;
  }
  case SQLCOM_DROP_TRIGGER:
  {
    res= mysql_create_or_drop_trigger(thd, all_tables, 0);
    break;
  }
4504 4505 4506
  case SQLCOM_XA_START:
    if (thd->transaction.xa_state == XA_IDLE && thd->lex->xa_opt == XA_RESUME)
    {
serg@serg.mylan's avatar
serg@serg.mylan committed
4507
      if (! thd->transaction.xid.eq(thd->lex->xid))
4508 4509 4510 4511 4512 4513 4514 4515
      {
        my_error(ER_XAER_NOTA, MYF(0));
        break;
      }
      thd->transaction.xa_state=XA_ACTIVE;
      send_ok(thd);
      break;
    }
serg@serg.mylan's avatar
serg@serg.mylan committed
4516
    if (thd->lex->xa_opt != XA_NONE)
4517 4518 4519 4520 4521 4522
    { // JOIN is not supported yet. TODO
      my_error(ER_XAER_INVAL, MYF(0));
      break;
    }
    if (thd->transaction.xa_state != XA_NOTR)
    {
4523 4524
      my_error(ER_XAER_RMFAIL, MYF(0),
               xa_state_names[thd->transaction.xa_state]);
4525 4526 4527 4528 4529 4530 4531 4532 4533
      break;
    }
    if (thd->active_transaction() || thd->locked_tables)
    {
      my_error(ER_XAER_OUTSIDE, MYF(0));
      break;
    }
    DBUG_ASSERT(thd->transaction.xid.is_null());
    thd->transaction.xa_state=XA_ACTIVE;
serg@serg.mylan's avatar
serg@serg.mylan committed
4534
    thd->transaction.xid.set(thd->lex->xid);
4535 4536 4537 4538 4539 4540 4541 4542 4543 4544 4545 4546 4547 4548
    thd->options= ((thd->options & (ulong) ~(OPTION_STATUS_NO_TRANS_UPDATE)) |
                   OPTION_BEGIN);
    thd->server_status|= SERVER_STATUS_IN_TRANS;
    send_ok(thd);
    break;
  case SQLCOM_XA_END:
    /* fake it */
    if (thd->lex->xa_opt != XA_NONE)
    { // SUSPEND and FOR MIGRATE are not supported yet. TODO
      my_error(ER_XAER_INVAL, MYF(0));
      break;
    }
    if (thd->transaction.xa_state != XA_ACTIVE)
    {
4549 4550
      my_error(ER_XAER_RMFAIL, MYF(0),
               xa_state_names[thd->transaction.xa_state]);
4551 4552
      break;
    }
serg@serg.mylan's avatar
serg@serg.mylan committed
4553
    if (!thd->transaction.xid.eq(thd->lex->xid))
4554 4555 4556 4557 4558 4559 4560 4561 4562 4563
    {
      my_error(ER_XAER_NOTA, MYF(0));
      break;
    }
    thd->transaction.xa_state=XA_IDLE;
    send_ok(thd);
    break;
  case SQLCOM_XA_PREPARE:
    if (thd->transaction.xa_state != XA_IDLE)
    {
4564 4565
      my_error(ER_XAER_RMFAIL, MYF(0),
               xa_state_names[thd->transaction.xa_state]);
4566 4567
      break;
    }
serg@serg.mylan's avatar
serg@serg.mylan committed
4568
    if (!thd->transaction.xid.eq(thd->lex->xid))
4569 4570 4571 4572 4573 4574 4575 4576 4577 4578 4579 4580 4581 4582
    {
      my_error(ER_XAER_NOTA, MYF(0));
      break;
    }
    if (ha_prepare(thd))
    {
      my_error(ER_XA_RBROLLBACK, MYF(0));
      thd->transaction.xa_state=XA_NOTR;
      break;
    }
    thd->transaction.xa_state=XA_PREPARED;
    send_ok(thd);
    break;
  case SQLCOM_XA_COMMIT:
serg@serg.mylan's avatar
serg@serg.mylan committed
4583
    if (!thd->transaction.xid.eq(thd->lex->xid))
4584
    {
serg@serg.mylan's avatar
serg@serg.mylan committed
4585
      if (!(res= !ha_commit_or_rollback_by_xid(thd->lex->xid, 1)))
4586
        my_error(ER_XAER_NOTA, MYF(0));
serg@serg.mylan's avatar
serg@serg.mylan committed
4587 4588
      else
        send_ok(thd);
4589 4590
      break;
    }
monty@mysql.com's avatar
monty@mysql.com committed
4591 4592
    if (thd->transaction.xa_state == XA_IDLE &&
        thd->lex->xa_opt == XA_ONE_PHASE)
4593
    {
4594 4595 4596
      int r;
      if ((r= ha_commit(thd)))
        my_error(r == 1 ? ER_XA_RBROLLBACK : ER_XAER_RMERR, MYF(0));
4597 4598 4599
      else
        send_ok(thd);
    }
monty@mysql.com's avatar
monty@mysql.com committed
4600 4601
    else if (thd->transaction.xa_state == XA_PREPARED &&
             thd->lex->xa_opt == XA_NONE)
4602
    {
4603 4604 4605
      if (wait_if_global_read_lock(thd, 0, 0))
      {
        ha_rollback(thd);
4606
        my_error(ER_XAER_RMERR, MYF(0));
4607
      }
4608
      else
4609 4610 4611 4612 4613 4614 4615
      {
        if (ha_commit_one_phase(thd, 1))
          my_error(ER_XAER_RMERR, MYF(0));
        else
          send_ok(thd);
        start_waiting_global_read_lock(thd);
      }
4616 4617 4618
    }
    else
    {
4619 4620
      my_error(ER_XAER_RMFAIL, MYF(0),
               xa_state_names[thd->transaction.xa_state]);
4621 4622 4623 4624 4625 4626 4627
      break;
    }
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    thd->transaction.xa_state=XA_NOTR;
    break;
  case SQLCOM_XA_ROLLBACK:
serg@serg.mylan's avatar
serg@serg.mylan committed
4628
    if (!thd->transaction.xid.eq(thd->lex->xid))
4629
    {
serg@serg.mylan's avatar
serg@serg.mylan committed
4630
      if (!(res= !ha_commit_or_rollback_by_xid(thd->lex->xid, 0)))
4631
        my_error(ER_XAER_NOTA, MYF(0));
serg@serg.mylan's avatar
serg@serg.mylan committed
4632 4633
      else
        send_ok(thd);
4634 4635 4636 4637 4638
      break;
    }
    if (thd->transaction.xa_state != XA_IDLE &&
        thd->transaction.xa_state != XA_PREPARED)
    {
4639 4640
      my_error(ER_XAER_RMFAIL, MYF(0),
               xa_state_names[thd->transaction.xa_state]);
4641 4642 4643 4644 4645 4646 4647 4648 4649 4650 4651
      break;
    }
    if (ha_rollback(thd))
      my_error(ER_XAER_RMERR, MYF(0));
    else
      send_ok(thd);
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    thd->transaction.xa_state=XA_NOTR;
    break;
  case SQLCOM_XA_RECOVER:
4652
    res= mysql_xa_recover(thd);
4653 4654 4655
    break;
  default:
    DBUG_ASSERT(0);                             /* Impossible */
4656
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4657 4658
    break;
  }
monty@mysql.com's avatar
monty@mysql.com committed
4659
  thd->proc_info="query end";
4660
  /* Two binlog-related cleanups: */
4661
  if (thd->one_shot_set)
monty@mysql.com's avatar
monty@mysql.com committed
4662 4663 4664 4665 4666 4667 4668 4669
  {
    /*
      If this is a SET, do nothing. This is to allow mysqlbinlog to print
      many SET commands (in this case we want the charset temp setting to
      live until the real query). This is also needed so that SET
      CHARACTER_SET_CLIENT... does not cancel itself immediately.
    */
    if (lex->sql_command != SQLCOM_SET_OPTION)
4670
    {
monty@mysql.com's avatar
monty@mysql.com committed
4671 4672 4673 4674 4675 4676 4677 4678 4679 4680 4681 4682
      thd->variables.character_set_client=
        global_system_variables.character_set_client;
      thd->variables.collation_connection=
        global_system_variables.collation_connection;
      thd->variables.collation_database=
        global_system_variables.collation_database;
      thd->variables.collation_server=
        global_system_variables.collation_server;
      thd->update_charset();
      thd->variables.time_zone=
        global_system_variables.time_zone;
      thd->one_shot_set= 0;
4683
    }
monty@mysql.com's avatar
monty@mysql.com committed
4684
  }
4685

4686 4687 4688 4689 4690
  /*
    The return value for ROW_COUNT() is "implementation dependent" if
    the statement is not DELETE, INSERT or UPDATE (or a CALL executing
    such a statement), but -1 is what JDBC and ODBC wants.
   */
4691
  if (lex->sql_command != SQLCOM_CALL && uc_update_queries[lex->sql_command]<2)
4692
    thd->row_count_func= -1;
4693
  goto cleanup;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4694 4695

error:
4696
  res= 1;
4697

4698
cleanup:
4699 4700 4701 4702 4703 4704 4705 4706
  if (unlikely(slave_fake_lock))
  {
    DBUG_PRINT("info",("undoing faked lock"));
    thd->lock= thd->locked_tables;
    thd->locked_tables= fake_prev_lock;
    if (thd->lock == thd->locked_tables)
      thd->lock= 0;
  }
4707
  DBUG_RETURN(res || thd->net.report_error);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4708 4709 4710
}


bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4711 4712
/*
  Check grants for commands which work only with one table and all other
4713
  tables belonging to subselects or implicitly opened tables.
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4714

4715
  SYNOPSIS
monty@mysql.com's avatar
monty@mysql.com committed
4716 4717
    check_one_table_access()
    thd			Thread handler
4718
    privilege		requested privilege
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4719
    all_tables		global table list of query
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4720 4721 4722

  RETURN
    0 - OK
monty@mysql.com's avatar
monty@mysql.com committed
4723
    1 - access denied, error is sent to client
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4724 4725
*/

4726
bool check_one_table_access(THD *thd, ulong privilege, TABLE_LIST *all_tables)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4727
{
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4728 4729
  if (check_access(thd, privilege, all_tables->db,
		   &all_tables->grant.privilege, 0, 0))
monty@mysql.com's avatar
monty@mysql.com committed
4730
    return 1;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4731

4732
  /* Show only 1 table for check_grant */
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4733
  if (grant_option && check_grant(thd, privilege, all_tables, 0, 1, 0))
monty@mysql.com's avatar
monty@mysql.com committed
4734
    return 1;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4735

4736
  /* Check rights on tables of subselects and implictly opened tables */
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4737
  TABLE_LIST *subselects_tables;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4738
  if ((subselects_tables= all_tables->next_global))
monty@mysql.com's avatar
monty@mysql.com committed
4739
  {
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
4740
    if ((check_table_access(thd, SELECT_ACL, subselects_tables, 0)))
monty@mysql.com's avatar
monty@mysql.com committed
4741 4742 4743
      return 1;
  }
  return 0;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4744 4745 4746
}


bk@work.mysql.com's avatar
bk@work.mysql.com committed
4747
/****************************************************************************
4748
  Get the user (global) and database privileges for all used tables
4749 4750 4751 4752 4753 4754 4755 4756 4757 4758 4759 4760 4761

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

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

    save_priv	In this we store global and db level grants for the table
		Note that we don't store db level grants if the global grants
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
4762 4763
                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
4764 4765 4766
****************************************************************************/

bool
4767
check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
4768
	     bool dont_check_global_grants, bool no_errors)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4769
{
4770 4771
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  ulong db_access;
4772
  bool  db_is_pattern= test(want_access & GRANT_ACL);
4773 4774
#endif
  ulong dummy;
4775 4776 4777
  DBUG_ENTER("check_access");
  DBUG_PRINT("enter",("db: %s  want_access: %lu  master_access: %lu",
                      db ? db : "", want_access, thd->master_access));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4778 4779 4780 4781 4782
  if (save_priv)
    *save_priv=0;
  else
    save_priv= &dummy;

4783
  if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4784
  {
4785
    DBUG_PRINT("error",("No database"));
4786
    if (!no_errors)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
4787 4788
      my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR),
                 MYF(0));                       /* purecov: tested */
4789
    DBUG_RETURN(TRUE);				/* purecov: tested */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4790 4791
  }

monty@mysql.com's avatar
monty@mysql.com committed
4792 4793 4794
#ifdef NO_EMBEDDED_ACCESS_CHECKS
  DBUG_RETURN(0);
#else
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4795 4796
  if ((thd->master_access & want_access) == want_access)
  {
4797 4798 4799 4800 4801 4802 4803
    /*
      If we don't have a global SELECT privilege, we have to get the database
      specific access rights to be able to handle queries of type
      UPDATE t1 SET a=1 WHERE b > 0
    */
    db_access= thd->db_access;
    if (!(thd->master_access & SELECT_ACL) &&
4804
	(db && (!thd->db || db_is_pattern || strcmp(db,thd->db))))
serg@serg.mylan's avatar
serg@serg.mylan committed
4805
      db_access=acl_get(thd->host, thd->ip, thd->priv_user, db, db_is_pattern);
4806
    *save_priv=thd->master_access | db_access;
4807
    DBUG_RETURN(FALSE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4808
  }
4809
  if (((want_access & ~thd->master_access) & ~(DB_ACLS | EXTRA_ACL)) ||
4810
      ! db && dont_check_global_grants)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4811
  {						// We can never grant this
4812
    DBUG_PRINT("error",("No possible access"));
4813
    if (!no_errors)
4814 4815 4816 4817 4818 4819
      my_error(ER_ACCESS_DENIED_ERROR, MYF(0),
               thd->priv_user,
               thd->priv_host,
               (thd->password ?
                ER(ER_YES) :
                ER(ER_NO)));                    /* purecov: tested */
4820
    DBUG_RETURN(TRUE);				/* purecov: tested */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
4821 4822 4823
  }

  if (db == any_db)
4824
    DBUG_RETURN(FALSE);				// Allow select on anything
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
4825

4826
  if (db && (!thd->db || db_is_pattern || strcmp(db,thd->db)))
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serg@serg.mylan committed
4827
    db_access=acl_get(thd->host, thd->ip, thd->priv_user, db, db_is_pattern);
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4828 4829
  else
    db_access=thd->db_access;
4830
  DBUG_PRINT("info",("db_access: %lu", db_access));
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4831
  /* Remove SHOW attribute and access rights we already have */
4832
  want_access &= ~(thd->master_access | EXTRA_ACL);
4833 4834
  DBUG_PRINT("info",("db_access: %lu  want_access: %lu",
                     db_access, want_access));
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4835
  db_access= ((*save_priv=(db_access | thd->master_access)) & want_access);
4836 4837

  /* grant_option is set if there exists a single table or column grant */
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4838
  if (db_access == want_access ||
4839
      (grant_option && !dont_check_global_grants &&
4840
       !(want_access & ~(db_access | TABLE_ACLS | PROC_ACLS))))
4841
    DBUG_RETURN(FALSE);				/* Ok */
4842 4843

  DBUG_PRINT("error",("Access denied"));
4844
  if (!no_errors)
4845 4846 4847 4848 4849 4850
    my_error(ER_DBACCESS_DENIED_ERROR, MYF(0),
             thd->priv_user,
             thd->priv_host,
             (db ? db : (thd->db ?
                         thd->db :
                         "unknown")));          /* purecov: tested */
4851
  DBUG_RETURN(TRUE);				/* purecov: tested */
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4852
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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4853 4854 4855
}


4856 4857 4858 4859 4860 4861 4862 4863 4864
/*
  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
4865
    One gets access right if one has ANY of the rights in want_access
4866 4867 4868 4869 4870 4871 4872 4873
    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
*/
4874 4875

bool check_global_access(THD *thd, ulong want_access)
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4876
{
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4877 4878 4879
#ifdef NO_EMBEDDED_ACCESS_CHECKS
  return 0;
#else
4880
  char command[128];
4881
  if ((thd->master_access & want_access))
4882 4883
    return 0;
  get_privilege_desc(command, sizeof(command), want_access);
4884
  my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), command);
4885
  return 1;
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4886
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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4887 4888 4889
}


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4890
/*
4891 4892
  Check the privilege for all used tables.  Table privileges are cached
  in the table list for GRANT checking
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4893 4894
*/

4895
bool
4896
check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables,
4897
		   bool no_errors)
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4898
{
4899 4900
  uint found=0;
  ulong found_access=0;
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4901
  TABLE_LIST *org_tables=tables;
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VIEW  
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4902
  for (; tables; tables= tables->next_global)
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4903
  {
4904
    if (tables->derived || tables->schema_table || tables->belong_to_view ||
4905
        (tables->table && (int)tables->table->s->tmp_table) ||
4906 4907
        my_tz_check_n_skip_implicit_tables(&tables,
                                           thd->lex->time_zone_tables_used))
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4908
      continue;
4909 4910
    if ((thd->master_access & want_access) == (want_access & ~EXTRA_ACL) &&
	thd->db)
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4911
      tables->grant.privilege= want_access;
4912
    else if (tables->db && tables->db == thd->db)
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4913 4914 4915 4916 4917
    {
      if (found && !grant_option)		// db already checked
	tables->grant.privilege=found_access;
      else
      {
4918 4919
	if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
			 0, no_errors))
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4920 4921
	  return TRUE;				// Access denied
	found_access=tables->grant.privilege;
4922
	found=1;
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4923 4924
      }
    }
4925
    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
4926
			  0, no_errors))
4927
      return TRUE;
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4928 4929
  }
  if (grant_option)
4930
    return check_grant(thd,want_access & ~EXTRA_ACL,org_tables,
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4931
		       test(want_access & EXTRA_ACL), UINT_MAX, no_errors);
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4932 4933 4934
  return FALSE;
}

4935

4936
bool
4937 4938
check_routine_access(THD *thd, ulong want_access,char *db, char *name,
		     bool is_proc, bool no_errors)
4939 4940 4941 4942 4943
{
  TABLE_LIST tables[1];
  
  bzero((char *)tables, sizeof(TABLE_LIST));
  tables->db= db;
4944
  tables->table_name= tables->alias= name;
4945 4946 4947 4948 4949 4950 4951
  
  if ((thd->master_access & want_access) == want_access && !thd->db)
    tables->grant.privilege= want_access;
  else if (check_access(thd,want_access,db,&tables->grant.privilege,
			0, no_errors))
    return TRUE;
  
4952
#ifndef NO_EMBEDDED_ACCESS_CHECKS
4953
  if (grant_option)
4954
    return check_grant_routine(thd, want_access, tables, is_proc, no_errors);
4955
#endif
4956 4957 4958 4959

  return FALSE;
}

4960 4961 4962 4963 4964 4965 4966 4967 4968 4969 4970 4971 4972 4973 4974

/*
  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
*/

4975 4976
bool check_some_routine_access(THD *thd, const char *db, const char *name,
                               bool is_proc)
4977 4978 4979 4980 4981 4982 4983
{
  ulong save_priv;
  if (thd->master_access & SHOW_PROC_ACLS)
    return FALSE;
  if (!check_access(thd, SHOW_PROC_ACLS, db, &save_priv, 0, 1) ||
      (save_priv & SHOW_PROC_ACLS))
    return FALSE;
4984
  return check_routine_level_acl(thd, db, name, is_proc);
4985 4986 4987
}


4988 4989 4990 4991 4992 4993 4994 4995 4996 4997 4998 4999 5000 5001 5002 5003 5004 5005 5006 5007 5008 5009 5010 5011 5012 5013 5014 5015 5016 5017 5018 5019 5020 5021 5022
/*
  Check if the given table has any of the asked privileges

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

  RETURN
    0  ok
    1  error
*/


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

  /* This loop will work as long as we have less than 32 privileges */
  for (access= 1; access < want_access ; access<<= 1)
  {
    if (access & want_access)
    {
      if (!check_access(thd, access, table->db,
                        &table->grant.privilege, 0, 1) &&
          !grant_option || !check_grant(thd, access, table, 0, 1, 1))
        DBUG_RETURN(0);
    }
  }
  DBUG_PRINT("exit",("no matching access rights"));
  DBUG_RETURN(1);
}


5023 5024
bool check_merge_table_access(THD *thd, char *db,
			      TABLE_LIST *table_list)
5025 5026 5027 5028
{
  int error=0;
  if (table_list)
  {
5029
    /* Check that all tables use the current database */
5030
    TABLE_LIST *tmp;
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VIEW  
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5031
    for (tmp= table_list; tmp; tmp= tmp->next_local)
5032 5033 5034 5035
    {
      if (!tmp->db || !tmp->db[0])
	tmp->db=db;
    }
5036
    error=check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
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5037
			     table_list,0);
5038 5039 5040 5041
  }
  return error;
}

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5042 5043 5044

static bool check_db_used(THD *thd,TABLE_LIST *tables)
{
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VIEW  
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5045
  for (; tables; tables= tables->next_global)
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5046 5047 5048 5049 5050
  {
    if (!tables->db)
    {
      if (!(tables->db=thd->db))
      {
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5051 5052
	my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR),
                   MYF(0));                     /* purecov: tested */
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5053 5054 5055 5056 5057 5058
	return TRUE;				/* purecov: tested */
      }
    }
  }
  return FALSE;
}
5059

5060

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5061 5062 5063 5064 5065 5066 5067 5068 5069 5070
/****************************************************************************
	Check stack size; Send error if there isn't enough stack to continue
****************************************************************************/

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

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5071 5072 5073 5074
#ifndef DBUG_OFF
long max_stack_used;
#endif

5075
#ifndef EMBEDDED_LIBRARY
5076 5077 5078 5079 5080 5081 5082 5083
/*
  Note: The 'buf' parameter is necessary, even if it is unused here.
  - fix_fields functions has a "dummy" buffer large enough for the
    corresponding exec. (Thus we only have to check in fix_fields.)
  - Passing to check_stack_overrun() prevents the compiler from removing it.
 */
bool check_stack_overrun(THD *thd, long margin,
			 char *buf __attribute__((unused)))
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5084 5085 5086
{
  long stack_used;
  if ((stack_used=used_stack(thd->thread_stack,(char*) &stack_used)) >=
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5087
      (long) (thread_stack - margin))
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5088
  {
5089 5090 5091
    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));
5092
    thd->fatal_error();
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5093 5094
    return 1;
  }
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5095 5096 5097
#ifndef DBUG_OFF
  max_stack_used= max(max_stack_used, stack_used);
#endif
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5098 5099
  return 0;
}
5100
#endif /* EMBEDDED_LIBRARY */
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5101 5102 5103 5104

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

5105
bool my_yyoverflow(short **yyss, YYSTYPE **yyvs, ulong *yystacksize)
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5106 5107
{
  LEX	*lex=current_lex;
5108
  ulong old_info=0;
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  if ((uint) *yystacksize >= MY_YACC_MAX)
    return 1;
  if (!lex->yacc_yyvs)
    old_info= *yystacksize;
  *yystacksize= set_zone((*yystacksize)*2,MY_YACC_INIT,MY_YACC_MAX);
  if (!(lex->yacc_yyvs= (char*)
	my_realloc((gptr) lex->yacc_yyvs,
		   *yystacksize*sizeof(**yyvs),
		   MYF(MY_ALLOW_ZERO_PTR | MY_FREE_ON_ERROR))) ||
      !(lex->yacc_yyss= (char*)
	my_realloc((gptr) lex->yacc_yyss,
		   *yystacksize*sizeof(**yyss),
		   MYF(MY_ALLOW_ZERO_PTR | MY_FREE_ON_ERROR))))
    return 1;
  if (old_info)
  {						// Copy old info from stack
    memcpy(lex->yacc_yyss, (gptr) *yyss, old_info*sizeof(**yyss));
    memcpy(lex->yacc_yyvs, (gptr) *yyvs, old_info*sizeof(**yyvs));
  }
  *yyss=(short*) lex->yacc_yyss;
  *yyvs=(YYSTYPE*) lex->yacc_yyvs;
  return 0;
}


/****************************************************************************
5135
  Initialize global thd variables needed for query
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5136 5137
****************************************************************************/

5138
void
5139
mysql_init_query(THD *thd, uchar *buf, uint length)
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5140 5141
{
  DBUG_ENTER("mysql_init_query");
5142
  lex_start(thd, buf, length);
5143 5144 5145 5146 5147 5148 5149 5150 5151 5152 5153 5154 5155 5156 5157 5158 5159 5160 5161 5162 5163
  mysql_reset_thd_for_next_command(thd);
  DBUG_VOID_RETURN;
}


/*
 Reset THD part responsible for command processing state.

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

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

void mysql_reset_thd_for_next_command(THD *thd)
{
  DBUG_ENTER("mysql_reset_thd_for_next_command");
5164
  thd->free_list= 0;
5165
  thd->select_number= 1;
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5166
  thd->total_warn_count=0;			// Warnings for this query
5167 5168
  thd->last_insert_id_used= thd->query_start_used= thd->insert_id_used=0;
  thd->sent_row_count= thd->examined_row_count= 0;
5169
  thd->is_fatal_error= thd->rand_used= thd->time_zone_used= 0;
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5170
  thd->server_status&= ~ (SERVER_MORE_RESULTS_EXISTS | 
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5171 5172
                          SERVER_QUERY_NO_INDEX_USED |
                          SERVER_QUERY_NO_GOOD_INDEX_USED);
5173
  thd->tmp_table_used= 0;
5174 5175
  if (opt_bin_log)
    reset_dynamic(&thd->user_var_events);
5176
  thd->clear_error();
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5177 5178 5179
  DBUG_VOID_RETURN;
}

5180

5181 5182 5183
void
mysql_init_select(LEX *lex)
{
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5184
  SELECT_LEX *select_lex= lex->current_select;
5185
  select_lex->init_select();
5186
  lex->wild= 0;
5187 5188
  if (select_lex == &lex->select_lex)
  {
5189
    DBUG_ASSERT(lex->result == 0);
5190 5191
    lex->exchange= 0;
  }
5192 5193
}

5194

5195
bool
5196
mysql_new_select(LEX *lex, bool move_down)
5197
{
5198
  SELECT_LEX *select_lex;
5199
  THD *thd= lex->thd;
5200 5201
  DBUG_ENTER("mysql_new_select");

5202
  if (!(select_lex= new (thd->mem_root) SELECT_LEX()))
5203
    DBUG_RETURN(1);
5204
  select_lex->select_number= ++thd->select_number;
5205 5206
  select_lex->init_query();
  select_lex->init_select();
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5207
  select_lex->parent_lex= lex;
5208 5209 5210 5211 5212
  /*
    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.
  */
5213 5214
  if (thd->current_arena->is_stmt_prepare())
    select_lex->uncacheable|= UNCACHEABLE_PREPARE;
5215 5216
  if (move_down)
  {
5217
    SELECT_LEX_UNIT *unit;
5218
    lex->subqueries= TRUE;
5219
    /* first select_lex of subselect or derived table */
5220
    if (!(unit= new (thd->mem_root) SELECT_LEX_UNIT()))
5221
      DBUG_RETURN(1);
5222

5223 5224
    unit->init_query();
    unit->init_select();
5225
    unit->thd= thd;
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5226
    unit->include_down(lex->current_select);
5227 5228
    unit->link_next= 0;
    unit->link_prev= 0;
5229
    unit->return_to= lex->current_select;
5230
    select_lex->include_down(unit);
5231 5232 5233 5234 5235
    /*
      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;
5236 5237
  }
  else
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5238
  {
5239
    Name_resolution_context *outer_context;
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5240 5241
    if (lex->current_select->order_list.first && !lex->current_select->braces)
    {
5242
      my_error(ER_WRONG_USAGE, MYF(0), "UNION", "ORDER BY");
5243
      DBUG_RETURN(1);
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5244
    }
5245
    select_lex->include_neighbour(lex->current_select);
5246 5247 5248 5249 5250 5251
    /*
      we are not sure that we have one level of SELECTs above, so we take
      outer_context address from first select of unit
    */
    outer_context=
      select_lex->master_unit()->first_select()->context.outer_context;
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5252 5253 5254 5255 5256 5257 5258 5259
    SELECT_LEX_UNIT *unit= select_lex->master_unit();
    SELECT_LEX *fake= unit->fake_select_lex;
    if (!fake)
    {
      /*
	as far as we included SELECT_LEX for UNION unit should have
	fake SELECT_LEX for UNION processing
      */
5260
      if (!(fake= unit->fake_select_lex= new (thd->mem_root) SELECT_LEX()))
5261
        DBUG_RETURN(1);
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5262 5263 5264 5265 5266
      fake->include_standalone(unit,
			       (SELECT_LEX_NODE**)&unit->fake_select_lex);
      fake->select_number= INT_MAX;
      fake->make_empty_select();
      fake->linkage= GLOBAL_OPTIONS_TYPE;
5267
      fake->select_limit= 0;
5268 5269 5270 5271 5272

      fake->context.outer_context= outer_context;
      /* allow item list resolving in fake select for ORDER BY */
      fake->context.resolve_in_select_list= TRUE;
      fake->context.select_lex= fake;
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5273
    }
5274
    select_lex->context.outer_context= outer_context;
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5275
  }
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5276

5277
  select_lex->master_unit()->global_parameters= select_lex;
5278
  select_lex->include_global((st_select_lex_node**)&lex->all_selects_list);
5279
  lex->current_select= select_lex;
5280 5281 5282 5283 5284
  /*
    in subquery is SELECT query and we allow resolution of names in SELECT
    list
  */
  select_lex->context.resolve_in_select_list= TRUE;
5285
  DBUG_RETURN(0);
5286
}
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5287

5288 5289 5290 5291 5292 5293 5294 5295 5296 5297 5298 5299 5300 5301 5302
/*
  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)
{
5303
  THD *thd;
5304
  LEX *lex;
5305
  LEX_STRING tmp, null_lex_string;
5306 5307
  Item *var;
  char buff[MAX_SYS_VAR_LENGTH*2+4+8], *end;
5308
  DBUG_ENTER("create_select_for_variable");
5309 5310

  thd= current_thd;
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5311
  lex= thd->lex;
5312 5313 5314 5315
  mysql_init_select(lex);
  lex->sql_command= SQLCOM_SELECT;
  tmp.str= (char*) var_name;
  tmp.length=strlen(var_name);
5316
  bzero((char*) &null_lex_string.str, sizeof(null_lex_string));
5317 5318 5319 5320 5321 5322 5323 5324
  /*
    We set the name of Item to @@session.var_name because that then is used
    as the column name in the output.
  */
  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);
5325 5326 5327
  DBUG_VOID_RETURN;
}

5328

monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5329 5330
void mysql_init_multi_delete(LEX *lex)
{
5331
  lex->sql_command=  SQLCOM_DELETE_MULTI;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5332
  mysql_init_select(lex);
5333 5334
  lex->select_lex.select_limit= 0;
  lex->unit.select_limit_cnt= HA_POS_ERROR;
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monty@mashka.mysql.fi committed
5335
  lex->select_lex.table_list.save_and_clear(&lex->auxilliary_table_list);
5336
  lex->lock_option= using_update_log ? TL_READ_NO_INSERT : TL_READ;
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
5337 5338
  lex->query_tables= 0;
  lex->query_tables_last= &lex->query_tables;
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monty@hundin.mysql.fi committed
5339
}
5340

5341

5342 5343 5344 5345
/*
  When you modify mysql_parse(), you may need to mofify
  mysql_test_parse_for_slave() in this same file.
*/
5346

5347
void mysql_parse(THD *thd, char *inBuf, uint length)
bk@work.mysql.com's avatar
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5348 5349 5350
{
  DBUG_ENTER("mysql_parse");

5351
  mysql_init_query(thd, (uchar*) inBuf, length);
5352
  if (query_cache_send_result_to_client(thd, inBuf, length) <= 0)
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5353
  {
5354
    LEX *lex= thd->lex;
5355
    if (!yyparse((void *)thd) && ! thd->is_fatal_error)
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
5356
    {
hf@deer.(none)'s avatar
hf@deer.(none) committed
5357
#ifndef NO_EMBEDDED_ACCESS_CHECKS
5358
      if (mqh_used && thd->user_connect &&
5359
	  check_mqh(thd, lex->sql_command))
5360 5361 5362 5363
      {
	thd->net.error = 0;
      }
      else
hf@deer.(none)'s avatar
hf@deer.(none) committed
5364
#endif
5365
      {
5366
	if (thd->net.report_error)
5367 5368
	{
	  if (thd->lex->sphead)
5369 5370 5371 5372
	  {
	    delete thd->lex->sphead;
	    thd->lex->sphead= NULL;
	  }
5373
	}
5374 5375
	else
	{
5376 5377 5378 5379 5380 5381 5382 5383 5384 5385
          /*
            Binlog logs a string starting from thd->query and having length
            thd->query_length; so we set thd->query_length correctly (to not
            log several statements in one event, when we executed only first).
            We set it to not see the ';' (otherwise it would get into binlog
            and Query_log_event::print() would give ';;' output).
            This also helps display only the current query in SHOW
            PROCESSLIST.
            Note that we don't need LOCK_thread_count to modify query_length.
          */
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5386 5387
          if (lex->found_semicolon &&
              (thd->query_length= (ulong)(lex->found_semicolon - thd->query)))
5388 5389
            thd->query_length--;
          /* Actually execute the query */
5390
	  mysql_execute_command(thd);
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
5391
	  query_cache_end_of_result(thd);
5392
	}
5393
      }
5394
      lex->unit.cleanup();
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5395 5396
    }
    else
5397 5398
    {
      DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
5399
			 thd->is_fatal_error));
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5400
      query_cache_abort(&thd->net);
5401
      lex->unit.cleanup();
5402
      if (thd->lex->sphead)
5403
      {
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5404
	/* Clean up after failed stored procedure/function */
5405 5406 5407
	delete thd->lex->sphead;
	thd->lex->sphead= NULL;
      }
5408
    }
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5409
    thd->proc_info="freeing items";
5410
    thd->end_statement();
5411
    thd->cleanup_after_query();
5412
    DBUG_ASSERT(thd->change_list.is_empty());
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5413
  }
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5414 5415 5416 5417
  DBUG_VOID_RETURN;
}


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5418
#ifdef HAVE_REPLICATION
5419 5420 5421 5422 5423 5424 5425 5426 5427 5428 5429
/*
  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)
{
5430
  LEX *lex= thd->lex;
5431
  bool error= 0;
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5432
  DBUG_ENTER("mysql_test_parse_for_slave");
5433

5434
  mysql_init_query(thd, (uchar*) inBuf, length);
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5435
  if (!yyparse((void*) thd) && ! thd->is_fatal_error &&
5436
      all_tables_not_ok(thd,(TABLE_LIST*) lex->select_lex.table_list.first))
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5437
    error= 1;                  /* Ignore question */
5438
  thd->end_statement();
5439
  thd->cleanup_after_query();
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5440
  DBUG_RETURN(error);
5441
}
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5442
#endif
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5443

5444

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monty@mysql.com committed
5445

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5446 5447 5448 5449 5450
/*****************************************************************************
** Store field definition for create
** Return 0 if ok
******************************************************************************/

monty@mashka.mysql.fi's avatar
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5451
bool add_field_to_list(THD *thd, char *field_name, enum_field_types type,
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5452
		       char *length, char *decimals,
5453
		       uint type_modifier,
5454 5455
		       Item *default_value, Item *on_update_value,
                       LEX_STRING *comment,
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		       char *change,
                       List<String> *interval_list, CHARSET_INFO *cs,
5458
		       uint uint_geom_type)
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5459 5460
{
  register create_field *new_field;
5461
  LEX  *lex= thd->lex;
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5462 5463 5464 5465
  DBUG_ENTER("add_field_to_list");

  if (strlen(field_name) > NAME_LEN)
  {
5466
    my_error(ER_TOO_LONG_IDENT, MYF(0), field_name); /* purecov: inspected */
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5467 5468 5469 5470 5471
    DBUG_RETURN(1);				/* purecov: inspected */
  }
  if (type_modifier & PRI_KEY_FLAG)
  {
    lex->col_list.push_back(new key_part_spec(field_name,0));
5472
    lex->key_list.push_back(new Key(Key::PRIMARY, NullS, HA_KEY_ALG_UNDEF,
5473
				    0, lex->col_list));
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5474 5475 5476 5477 5478
    lex->col_list.empty();
  }
  if (type_modifier & (UNIQUE_FLAG | UNIQUE_KEY_FLAG))
  {
    lex->col_list.push_back(new key_part_spec(field_name,0));
5479
    lex->key_list.push_back(new Key(Key::UNIQUE, NullS, HA_KEY_ALG_UNDEF, 0,
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5480 5481 5482 5483
				    lex->col_list));
    lex->col_list.empty();
  }

5484
  if (default_value)
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5485
  {
5486
    /* 
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
5487 5488
      Default value should be literal => basic constants =>
      no need fix_fields()
5489 5490 5491
      
      We allow only one function as part of default value - 
      NOW() as default for TIMESTAMP type.
5492
    */
5493 5494 5495
    if (default_value->type() == Item::FUNC_ITEM && 
        !(((Item_func*)default_value)->functype() == Item_func::NOW_FUNC &&
         type == FIELD_TYPE_TIMESTAMP))
5496
    {
5497
      my_error(ER_INVALID_DEFAULT, MYF(0), field_name);
5498 5499 5500
      DBUG_RETURN(1);
    }
    else if (default_value->type() == Item::NULL_ITEM)
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5501
    {
5502
      default_value= 0;
5503 5504 5505
      if ((type_modifier & (NOT_NULL_FLAG | AUTO_INCREMENT_FLAG)) ==
	  NOT_NULL_FLAG)
      {
5506
	my_error(ER_INVALID_DEFAULT, MYF(0), field_name);
5507 5508 5509 5510 5511
	DBUG_RETURN(1);
      }
    }
    else if (type_modifier & AUTO_INCREMENT_FLAG)
    {
5512
      my_error(ER_INVALID_DEFAULT, MYF(0), field_name);
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5513 5514 5515
      DBUG_RETURN(1);
    }
  }
5516 5517 5518

  if (on_update_value && type != FIELD_TYPE_TIMESTAMP)
  {
5519
    my_error(ER_INVALID_ON_UPDATE, MYF(0), field_name);
5520 5521
    DBUG_RETURN(1);
  }
5522

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  if (type == FIELD_TYPE_TIMESTAMP && length)
  {
    /* Display widths are no longer supported for TIMSTAMP as of MySQL 4.1.
       In other words, for declarations such as TIMESTAMP(2), TIMESTAMP(4),
       and so on, the display width is ignored.
    */
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5529 5530 5531
    char buf[32];
    my_snprintf(buf, sizeof(buf),
                "TIMESTAMP(%s)", length, system_charset_info);
5532 5533 5534
    push_warning_printf(thd,MYSQL_ERROR::WARN_LEVEL_WARN,
                        ER_WARN_DEPRECATED_SYNTAX,
                        ER(ER_WARN_DEPRECATED_SYNTAX),
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msvensson@neptunus.(none) committed
5535
                        buf, "TIMESTAMP");
5536 5537
  }

5538 5539 5540
  if (!(new_field= new_create_field(thd, field_name, type, length, decimals,
		type_modifier, default_value, on_update_value,
		comment, change, interval_list, cs, uint_geom_type)))
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bk@work.mysql.com committed
5541
    DBUG_RETURN(1);
5542 5543 5544 5545 5546 5547 5548 5549 5550 5551 5552 5553 5554 5555 5556 5557 5558 5559 5560 5561 5562 5563 5564 5565 5566 5567 5568

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

/*****************************************************************************
** Create field definition for create
** Return 0 on failure, otherwise return create_field instance
******************************************************************************/
  
create_field *
new_create_field(THD *thd, char *field_name, enum_field_types type,
		 char *length, char *decimals,
		 uint type_modifier, 
		 Item *default_value, Item *on_update_value,
		 LEX_STRING *comment,
		 char *change, List<String> *interval_list, CHARSET_INFO *cs,
		 uint uint_geom_type)
{
  register create_field *new_field;
  uint sign_len, allowed_type_modifier=0;
  ulong max_field_charlength= MAX_FIELD_CHARLENGTH;
  DBUG_ENTER("new_create_field");
  
  if (!(new_field=new create_field()))
    DBUG_RETURN(NULL);
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5569 5570
  new_field->field=0;
  new_field->field_name=field_name;
5571
  new_field->def= default_value;
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5572 5573 5574
  new_field->flags= type_modifier;
  new_field->unireg_check= (type_modifier & AUTO_INCREMENT_FLAG ?
			    Field::NEXT_NUMBER : Field::NONE);
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  new_field->decimals= decimals ? (uint)atoi(decimals) : 0;
  if (new_field->decimals >= NOT_FIXED_DEC)
  {
    my_error(ER_TOO_BIG_SCALE, MYF(0), new_field->decimals, field_name,
             NOT_FIXED_DEC-1);
    DBUG_RETURN(NULL);
  }

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5583 5584 5585 5586
  new_field->sql_type=type;
  new_field->length=0;
  new_field->change=change;
  new_field->interval=0;
5587
  new_field->pack_length= new_field->key_length= 0;
5588
  new_field->charset=cs;
5589
  new_field->geom_type= (Field::geometry_type) uint_geom_type;
5590

5591
  new_field->comment=*comment;
5592 5593 5594
  /*
    Set flag if this field doesn't have a default value
  */
5595
  if (!default_value && !(type_modifier & AUTO_INCREMENT_FLAG) &&
5596
      (type_modifier & NOT_NULL_FLAG) && type != FIELD_TYPE_TIMESTAMP)
5597 5598
    new_field->flags|= NO_DEFAULT_VALUE_FLAG;

5599 5600
  if (length && !(new_field->length= (uint) atoi(length)))
    length=0; /* purecov: inspected */
5601
  sign_len=type_modifier & UNSIGNED_FLAG ? 0 : 1;
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5602 5603 5604

  switch (type) {
  case FIELD_TYPE_TINY:
5605
    if (!length) new_field->length=MAX_TINYINT_WIDTH+sign_len;
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5606 5607 5608
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_SHORT:
5609
    if (!length) new_field->length=MAX_SMALLINT_WIDTH+sign_len;
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5610 5611 5612
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_INT24:
5613
    if (!length) new_field->length=MAX_MEDIUMINT_WIDTH+sign_len;
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5614 5615 5616
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_LONG:
5617
    if (!length) new_field->length=MAX_INT_WIDTH+sign_len;
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5618 5619 5620
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_LONGLONG:
5621
    if (!length) new_field->length=MAX_BIGINT_WIDTH;
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5622 5623 5624 5625
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_NULL:
    break;
5626
  case FIELD_TYPE_NEWDECIMAL:
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5627
    if (!length)
5628 5629
      new_field->length= 10;
    if (new_field->length > DECIMAL_MAX_PRECISION)
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5630
    {
5631 5632 5633
      my_error(ER_TOO_BIG_PRECISION, MYF(0), new_field->length, field_name,
               DECIMAL_MAX_PRECISION);
      DBUG_RETURN(NULL);
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monty@mysql.com committed
5634
    }
5635
    if (new_field->length < new_field->decimals)
5636
    {
5637 5638
      my_error(ER_SCALE_BIGGER_THAN_PRECISION, MYF(0), field_name);
      DBUG_RETURN(NULL);
5639
    }
5640 5641 5642 5643 5644 5645
    new_field->length=
      my_decimal_precision_to_length(new_field->length, new_field->decimals,
                                     type_modifier & UNSIGNED_FLAG);
    new_field->pack_length=
      my_decimal_get_binary_size(new_field->length, new_field->decimals);
    break;
5646 5647 5648 5649 5650 5651 5652 5653 5654
  case MYSQL_TYPE_VARCHAR:
    /*
      Long VARCHAR's are automaticly converted to blobs in mysql_prepare_table
      if they don't have a default value
    */
    max_field_charlength= MAX_FIELD_VARCHARLENGTH;
    break;
  case MYSQL_TYPE_STRING:
    break;
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5655 5656 5657 5658
  case FIELD_TYPE_BLOB:
  case FIELD_TYPE_TINY_BLOB:
  case FIELD_TYPE_LONG_BLOB:
  case FIELD_TYPE_MEDIUM_BLOB:
5659
  case FIELD_TYPE_GEOMETRY:
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5660 5661 5662 5663 5664 5665
    if (default_value)				// Allow empty as default value
    {
      String str,*res;
      res=default_value->val_str(&str);
      if (res->length())
      {
5666 5667
	my_error(ER_BLOB_CANT_HAVE_DEFAULT, MYF(0),
                 field_name); /* purecov: inspected */
5668
	DBUG_RETURN(NULL);
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      }
      new_field->def=0;
    }
    new_field->flags|=BLOB_FLAG;
    break;
  case FIELD_TYPE_YEAR:
    if (!length || new_field->length != 2)
      new_field->length=4;			// Default length
    new_field->flags|= ZEROFILL_FLAG | UNSIGNED_FLAG;
    break;
  case FIELD_TYPE_FLOAT:
    /* change FLOAT(precision) to FLOAT or DOUBLE */
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    if (length && !decimals)
    {
      uint tmp_length=new_field->length;
      if (tmp_length > PRECISION_FOR_DOUBLE)
      {
5687
	my_error(ER_WRONG_FIELD_SPEC, MYF(0), field_name);
5688
	DBUG_RETURN(NULL);
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      }
      else if (tmp_length > PRECISION_FOR_FLOAT)
      {
	new_field->sql_type=FIELD_TYPE_DOUBLE;
	new_field->length=DBL_DIG+7;			// -[digits].E+###
      }
      else
	new_field->length=FLT_DIG+6;			// -[digits].E+##
      new_field->decimals= NOT_FIXED_DEC;
      break;
    }
    if (!length)
    {
      new_field->length =  FLT_DIG+6;
      new_field->decimals= NOT_FIXED_DEC;
    }
    break;
  case FIELD_TYPE_DOUBLE:
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    if (!length)
    {
      new_field->length = DBL_DIG+7;
      new_field->decimals=NOT_FIXED_DEC;
    }
    break;
  case FIELD_TYPE_TIMESTAMP:
    if (!length)
      new_field->length= 14;			// Full date YYYYMMDDHHMMSS
5717
    else if (new_field->length != 19)
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5718
    {
5719 5720 5721 5722
      /*
        We support only even TIMESTAMP lengths less or equal than 14
        and 19 as length of 4.1 compatible representation.
      */
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      new_field->length=((new_field->length+1)/2)*2; /* purecov: inspected */
      new_field->length= min(new_field->length,14); /* purecov: inspected */
    }
5726
    new_field->flags|= ZEROFILL_FLAG | UNSIGNED_FLAG;
5727 5728 5729 5730 5731 5732 5733 5734 5735 5736 5737 5738 5739 5740 5741 5742 5743 5744 5745 5746
    if (default_value)
    {
      /* Grammar allows only NOW() value for ON UPDATE clause */
      if (default_value->type() == Item::FUNC_ITEM && 
          ((Item_func*)default_value)->functype() == Item_func::NOW_FUNC)
      {
        new_field->unireg_check= (on_update_value?Field::TIMESTAMP_DNUN_FIELD:
                                                  Field::TIMESTAMP_DN_FIELD);
        /*
          We don't need default value any longer moreover it is dangerous.
          Everything handled by unireg_check further.
        */
        new_field->def= 0;
      }
      else
        new_field->unireg_check= (on_update_value?Field::TIMESTAMP_UN_FIELD:
                                                  Field::NONE);
    }
    else
    {
5747 5748 5749 5750 5751 5752 5753 5754
      /*
        If we have default TIMESTAMP NOT NULL column without explicit DEFAULT
        or ON UPDATE values then for the sake of compatiblity we should treat
        this column as having DEFAULT NOW() ON UPDATE NOW() (when we don't
        have another TIMESTAMP column with auto-set option before this one)
        or DEFAULT 0 (in other cases).
        So here we are setting TIMESTAMP_OLD_FIELD only temporary, and will
        replace this value by TIMESTAMP_DNUN_FIELD or NONE later when
5755
        information about all TIMESTAMP fields in table will be availiable.
5756 5757 5758

        If we have TIMESTAMP NULL column without explicit DEFAULT value
        we treat it as having DEFAULT NULL attribute.
5759
      */
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5760 5761 5762 5763 5764
      new_field->unireg_check= (on_update_value ?
                                Field::TIMESTAMP_UN_FIELD :
                                (new_field->flags & NOT_NULL_FLAG ?
                                 Field::TIMESTAMP_OLD_FIELD:
                                 Field::NONE));
5765
    }
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    break;
  case FIELD_TYPE_DATE:				// Old date type
    if (protocol_version != PROTOCOL_VERSION-1)
      new_field->sql_type=FIELD_TYPE_NEWDATE;
    /* fall trough */
  case FIELD_TYPE_NEWDATE:
    new_field->length=10;
    break;
  case FIELD_TYPE_TIME:
    new_field->length=10;
    break;
  case FIELD_TYPE_DATETIME:
    new_field->length=19;
    break;
  case FIELD_TYPE_SET:
    {
5782
      if (interval_list->elements > sizeof(longlong)*8)
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bk@work.mysql.com committed
5783
      {
5784
	my_error(ER_TOO_BIG_SET, MYF(0), field_name); /* purecov: inspected */
5785
	DBUG_RETURN(NULL);
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bk@work.mysql.com committed
5786
      }
5787
      new_field->pack_length= get_set_pack_length(interval_list->elements);
5788 5789 5790 5791 5792 5793 5794 5795 5796 5797 5798

      List_iterator<String> it(*interval_list);
      String *tmp;
      while ((tmp= it++))
        new_field->interval_list.push_back(tmp);
      /*
        Set fake length to 1 to pass the below conditions.
        Real length will be set in mysql_prepare_table()
        when we know the character set of the column
      */
      new_field->length= 1;
5799
      break;
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    }
  case FIELD_TYPE_ENUM:
    {
5803
      // Should be safe
5804
      new_field->pack_length= get_enum_pack_length(interval_list->elements);
5805

5806 5807 5808 5809 5810
      List_iterator<String> it(*interval_list);
      String *tmp;
      while ((tmp= it++))
        new_field->interval_list.push_back(tmp);
      new_field->length= 1; // See comment for FIELD_TYPE_SET above.
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      break;
5812
   }
5813 5814
  case MYSQL_TYPE_VAR_STRING:
    DBUG_ASSERT(0);                             // Impossible
5815
    break;
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  case MYSQL_TYPE_BIT:
    {
      if (!length)
        new_field->length= 1;
      if (new_field->length > MAX_BIT_FIELD_LENGTH)
      {
        my_error(ER_TOO_BIG_FIELDLENGTH, MYF(0), field_name,
                 MAX_BIT_FIELD_LENGTH);
5824
        DBUG_RETURN(NULL);
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      }
      new_field->pack_length= (new_field->length + 7) / 8;
      break;
    }
5829 5830
  case FIELD_TYPE_DECIMAL:
    DBUG_ASSERT(0); /* Was obsolete */
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5831 5832
  }

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  if (!(new_field->flags & BLOB_FLAG) &&
      ((new_field->length > max_field_charlength && type != FIELD_TYPE_SET && 
        type != FIELD_TYPE_ENUM &&
        (type != MYSQL_TYPE_VARCHAR || default_value)) ||
       (!new_field->length &&
        type != MYSQL_TYPE_STRING &&
        type != MYSQL_TYPE_VARCHAR && type != FIELD_TYPE_GEOMETRY)))
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5840
  {
5841
    my_error(ER_TOO_BIG_FIELDLENGTH, MYF(0),
5842
             field_name, max_field_charlength); /* purecov: inspected */
5843
    DBUG_RETURN(NULL);
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5844 5845 5846 5847
  }
  type_modifier&= AUTO_INCREMENT_FLAG;
  if ((~allowed_type_modifier) & type_modifier)
  {
5848
    my_error(ER_WRONG_FIELD_SPEC, MYF(0), field_name);
5849
    DBUG_RETURN(NULL);
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5850
  }
5851
  DBUG_RETURN(new_field);
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5852 5853
}

5854

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

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

bool
5863
add_proc_to_list(THD* thd, Item *item)
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{
  ORDER *order;
  Item	**item_ptr;

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5868
  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;
5874
  thd->lex->proc_list.link_in_list((byte*) order,(byte**) &order->next);
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  return 0;
}


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

static void remove_escape(char *name)
{
5883 5884
  if (!*name)					// For empty DB names
    return;
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5885 5886
  char *to;
#ifdef USE_MB
5887
  char *strend=name+(uint) strlen(name);
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5888 5889 5890 5891 5892
#endif
  for (to=name; *name ; name++)
  {
#ifdef USE_MB
    int l;
5893 5894
    if (use_mb(system_charset_info) &&
        (l = my_ismbchar(system_charset_info, name, strend)))
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    {
	while (l--)
	    *to++ = *name++;
	name--;
	continue;
    }
#endif
    if (*name == '\\' && name[1])
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5903
      name++;					// Skip '\\'
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    *to++= *name;
  }
  *to=0;
}

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


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5914
bool add_to_list(THD *thd, SQL_LIST &list,Item *item,bool asc)
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5915 5916 5917
{
  ORDER *order;
  DBUG_ENTER("add_to_list");
5918
  if (!(order = (ORDER *) thd->alloc(sizeof(ORDER))))
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5919
    DBUG_RETURN(1);
5920 5921
  order->item_ptr= item;
  order->item= &order->item_ptr;
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5922 5923 5924
  order->asc = asc;
  order->free_me=0;
  order->used=0;
5925
  order->counter_used= 0;
5926
  list.link_in_list((byte*) order,(byte**) &order->next);
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  DBUG_RETURN(0);
}


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/*
  Add a table to list of used tables

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

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

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5950 5951
TABLE_LIST *st_select_lex::add_table_to_list(THD *thd,
					     Table_ident *table,
5952
					     LEX_STRING *alias,
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5953 5954
					     ulong table_options,
					     thr_lock_type lock_type,
5955 5956
					     List<String> *use_index_arg,
					     List<String> *ignore_index_arg,
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5957
                                             LEX_STRING *option)
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{
  register TABLE_LIST *ptr;
  char *alias_str;
5961
  LEX *lex= thd->lex;
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5962 5963 5964 5965 5966
  DBUG_ENTER("add_table_to_list");

  if (!table)
    DBUG_RETURN(0);				// End of memory
  alias_str= alias ? alias->str : table->table.str;
5967
  if (check_table_name(table->table.str,table->table.length) ||
5968
      table->db.str && check_db_name(table->db.str))
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5969
  {
5970
    my_error(ER_WRONG_TABLE_NAME, MYF(0), table->table.str);
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    DBUG_RETURN(0);
  }

  if (!alias)					/* Alias is case sensitive */
5975 5976 5977
  {
    if (table->sel)
    {
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5978 5979
      my_message(ER_DERIVED_MUST_HAVE_ALIAS,
                 ER(ER_DERIVED_MUST_HAVE_ALIAS), MYF(0));
5980 5981
      DBUG_RETURN(0);
    }
5982
    if (!(alias_str=thd->memdup(alias_str,table->table.length+1)))
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5983
      DBUG_RETURN(0);
5984
  }
5985
  if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
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5986
    DBUG_RETURN(0);				/* purecov: inspected */
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5987
  if (table->db.str)
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  {
    ptr->db= table->db.str;
    ptr->db_length= table->db.length;
  }
  else if (thd->db)
  {
    ptr->db= thd->db;
    ptr->db_length= thd->db_length;
  }
  else
  {
5999 6000
    /* The following can't be "" as we may do 'casedn_str()' on it */
    ptr->db= empty_c_string;
6001 6002
    ptr->db_length= 0;
  }
6003
  if (thd->current_arena->is_stmt_prepare_or_first_sp_execute())
6004
    ptr->db= thd->strdup(ptr->db);
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6005

6006
  ptr->alias= alias_str;
6007 6008
  if (lower_case_table_names && table->table.length)
    my_casedn_str(files_charset_info, table->table.str);
6009 6010
  ptr->table_name=table->table.str;
  ptr->table_name_length=table->table.length;
6011
  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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6014
  ptr->ignore_leaves= test(table_options & TL_OPTION_IGNORE_LEAVES);
6015
  ptr->derived=	    table->sel;
6016 6017 6018
  if (!my_strcasecmp(system_charset_info, ptr->db,
                     information_schema_name.str))
  {
6019
    ST_SCHEMA_TABLE *schema_table= find_schema_table(thd, ptr->table_name);
6020 6021 6022
    if (!schema_table ||
        (schema_table->hidden && 
         lex->orig_sql_command == SQLCOM_END))  // not a 'show' command
6023
    {
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6024
      my_error(ER_UNKNOWN_TABLE, MYF(0),
6025
               ptr->table_name, information_schema_name.str);
6026 6027
      DBUG_RETURN(0);
    }
6028
    ptr->schema_table_name= ptr->table_name;
6029 6030
    ptr->schema_table= schema_table;
  }
6031
  ptr->select_lex=  lex->current_select;
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  ptr->cacheable_table= 1;
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  if (use_index_arg)
    ptr->use_index=(List<String> *) thd->memdup((gptr) use_index_arg,
						sizeof(*use_index_arg));
  if (ignore_index_arg)
    ptr->ignore_index=(List<String> *) thd->memdup((gptr) ignore_index_arg,
						   sizeof(*ignore_index_arg));
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6039
  ptr->option= option ? option->str : 0;
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  /* check that used name is unique */
6041
  if (lock_type != TL_IGNORE)
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6042
  {
6043
    for (TABLE_LIST *tables=(TABLE_LIST*) table_list.first ;
6044
	 tables ;
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6045
	 tables=tables->next_local)
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    {
6047 6048
      if (!my_strcasecmp(table_alias_charset, alias_str, tables->alias) &&
	  !strcmp(ptr->db, tables->db))
6049
      {
6050
	my_error(ER_NONUNIQ_TABLE, MYF(0), alias_str); /* purecov: tested */
6051 6052
	DBUG_RETURN(0);				/* purecov: tested */
      }
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6053 6054
    }
  }
6055
  /* Link table in local list (list for current select) */
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  table_list.link_in_list((byte*) ptr, (byte**) &ptr->next_local);
6057
  /* Link table in global list (all used tables) */
6058
  lex->add_to_query_tables(ptr);
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  DBUG_RETURN(ptr);
}

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6062

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/*
  Initialize a new table list for a nested join

  SYNOPSIS
6067
    init_nested_join()
6068
    thd         current thread
6069

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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");
6089

6090 6091 6092 6093 6094 6095 6096 6097 6098 6099 6100 6101 6102 6103 6104 6105 6106 6107 6108 6109 6110 6111 6112 6113
  if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))) ||
      !(nested_join= ptr->nested_join=
                    (NESTED_JOIN *) thd->calloc(sizeof(NESTED_JOIN))))
    DBUG_RETURN(1);
  join_list->push_front(ptr);
  ptr->embedding= embedding;
  ptr->join_list= join_list;
  embedding= ptr;
  join_list= &nested_join->join_list;
  join_list->empty();
  DBUG_RETURN(0);
}


/*
  End a nested join table list

  SYNOPSIS
    end_nested_join()
    thd         current thread

  DESCRIPTION
    The function returns to the previous join nest level.
    If the current level contains only one member, the function
6114
    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;
6124
  NESTED_JOIN *nested_join;
6125
  DBUG_ENTER("end_nested_join");
6126

6127
  DBUG_ASSERT(embedding);
6128 6129 6130
  ptr= embedding;
  join_list= ptr->join_list;
  embedding= ptr->embedding;
6131
  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;
  }
6141
  else if (nested_join->join_list.elements == 0)
6142 6143
  {
    join_list->pop();
6144
    ptr= 0;                                     // return value
6145
  }
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  DBUG_RETURN(ptr);
}


/*
  Nest last join operation

  SYNOPSIS
6154
    nest_last_join()
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    thd         current thread

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

  RETURN VALUE
    Pointer to TABLE_LIST element created for the new nested join, if success
    0, otherwise
*/

TABLE_LIST *st_select_lex::nest_last_join(THD *thd)
{
  TABLE_LIST *ptr;
  NESTED_JOIN *nested_join;
  DBUG_ENTER("nest_last_join");
6170

6171 6172 6173 6174 6175 6176 6177 6178 6179 6180 6181 6182 6183 6184 6185 6186 6187 6188 6189 6190 6191 6192
  if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))) ||
      !(nested_join= ptr->nested_join=
                    (NESTED_JOIN *) thd->calloc(sizeof(NESTED_JOIN))))
    DBUG_RETURN(0);
  ptr->embedding= embedding;
  ptr->join_list= join_list;
  List<TABLE_LIST> *embedded_list= &nested_join->join_list;
  embedded_list->empty();
  for (int i=0; i < 2; i++)
  {
    TABLE_LIST *table= join_list->pop();
    table->join_list= embedded_list;
    table->embedding= ptr;
    embedded_list->push_back(table);
  }
  join_list->push_front(ptr);
  nested_join->used_tables= nested_join->not_null_tables= (table_map) 0;
  DBUG_RETURN(ptr);
}


/*
6193
  Save names for a join with using clause
6194

6195 6196 6197 6198 6199 6200 6201
  SYNOPSIS
    save_names_for_using_list
    tab1      left table in join
    tab2      right table in join

  DESCRIPTION
    The function saves the full names of the tables in st_select_lex
6202 6203
    to be able to build later an on expression to replace the using clause.

6204
  RETURN VALUE
6205 6206
    None
*/
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void st_select_lex::save_names_for_using_list(TABLE_LIST *tab1,
                                              TABLE_LIST *tab2)
{
  while (tab1->nested_join)
  {
    tab1= tab1->nested_join->join_list.head();
  }
  db1= tab1->db;
  table1= tab1->alias;
  while (tab2->nested_join)
  {
    TABLE_LIST *next;
    List_iterator_fast<TABLE_LIST> it(tab2->nested_join->join_list);
    tab2= it++;
    while ((next= it++))
      tab2= next;
  }
  db2= tab2->db;
  table2= tab2->alias;
}
6228

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/*
  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
6263 6264 6265

  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
*/

6289
TABLE_LIST *st_select_lex::convert_right_join()
6290 6291
{
  TABLE_LIST *tab2= join_list->pop();
6292
  TABLE_LIST *tab1= join_list->pop();
6293 6294 6295 6296 6297 6298 6299 6300 6301
  DBUG_ENTER("convert_right_join");

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

  DBUG_RETURN(tab1);
}

6302 6303 6304 6305 6306 6307 6308 6309 6310 6311 6312 6313 6314
/*
  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
*/

6315
void st_select_lex::set_lock_for_tables(thr_lock_type lock_type)
6316 6317 6318 6319 6320 6321
{
  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)
6325 6326 6327 6328 6329 6330 6331
  {
    tables->lock_type= lock_type;
    tables->updating=  for_update;
  }
  DBUG_VOID_RETURN;
}

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6332

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bk@work.mysql.com committed
6333 6334
void add_join_on(TABLE_LIST *b,Item *expr)
{
6335
  if (expr)
6336
  {
6337 6338 6339 6340
    if (!b->on_expr)
      b->on_expr=expr;
    else
    {
monty@mysql.com's avatar
monty@mysql.com committed
6341
      /* This only happens if you have both a right and left join */
6342 6343 6344
      b->on_expr=new Item_cond_and(b->on_expr,expr);
    }
    b->on_expr->top_level_item();
6345
  }
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6346 6347 6348
}


6349 6350 6351 6352 6353 6354 6355
/*
  Mark that we have a NATURAL JOIN between two tables

  SYNOPSIS
    add_join_natural()
    a			Table to do normal join with
    b			Do normal join with this table
6356

6357 6358 6359 6360 6361 6362 6363 6364 6365 6366
  IMPLEMENTATION
    This function just marks that table b should be joined with a.
    The function setup_cond() will create in b->on_expr a list
    of equal condition between all fields of the same name.

    SELECT * FROM t1 NATURAL LEFT JOIN t2
     <=>
    SELECT * FROM t1 LEFT JOIN t2 ON (t1.i=t2.i and t1.j=t2.j ... )
*/

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6367 6368 6369 6370 6371
void add_join_natural(TABLE_LIST *a,TABLE_LIST *b)
{
  b->natural_join=a;
}

6372
/*
6373 6374 6375 6376 6377 6378 6379 6380 6381 6382 6383 6384 6385 6386 6387 6388 6389
  Reload/resets privileges and the different caches.

  SYNOPSIS
    reload_acl_and_cache()
    thd			Thread handler
    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
                        pointer where, if it is not NULL, reload_acl_and_cache()
                        will put 0 if it thinks we really should not write to
                        the binlog. Otherwise it will put 1.

  RETURN
    0	 ok
    !=0  error
6390 6391
*/

6392 6393
bool reload_acl_and_cache(THD *thd, ulong options, TABLE_LIST *tables,
                          bool *write_to_binlog)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6394 6395 6396
{
  bool result=0;
  select_errors=0;				/* Write if more errors */
6397
  bool tmp_write_to_binlog= 1;
6398 6399 6400 6401 6402 6403 6404

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

hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
6405
#ifndef NO_EMBEDDED_ACCESS_CHECKS
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6406 6407
  if (options & REFRESH_GRANT)
  {
6408
    acl_reload(thd);
6409
    grant_reload(thd);
6410
    reset_mqh((LEX_USER *)NULL, TRUE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6411
  }
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
6412
#endif
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6413 6414
  if (options & REFRESH_LOG)
  {
6415
    /*
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
6416 6417
      Flush the normal query log, the update log, the binary log,
      the slow query log, and the relay log (if it exists).
6418
    */
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
6419

6420
    /*
monty@mysql.com's avatar
monty@mysql.com committed
6421 6422 6423 6424
      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)
6425 6426
    */
    tmp_write_to_binlog= 0;
6427 6428
    mysql_log.new_file(1);
    mysql_slow_log.new_file(1);
6429
    mysql_bin_log.rotate_and_purge(RP_FORCE_ROTATE);
6430
#ifdef HAVE_REPLICATION
6431
    pthread_mutex_lock(&LOCK_active_mi);
6432
    rotate_relay_log(active_mi);
6433
    pthread_mutex_unlock(&LOCK_active_mi);
6434
#endif
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6435 6436
    if (ha_flush_logs())
      result=1;
6437 6438
    if (flush_error_log())
      result=1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6439
  }
6440
#ifdef HAVE_QUERY_CACHE
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
6441 6442
  if (options & REFRESH_QUERY_CACHE_FREE)
  {
6443
    query_cache.pack();				// FLUSH QUERY CACHE
6444
    options &= ~REFRESH_QUERY_CACHE;    // Don't flush cache, just free memory
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
6445 6446 6447
  }
  if (options & (REFRESH_TABLES | REFRESH_QUERY_CACHE))
  {
6448
    query_cache.flush();			// RESET QUERY CACHE
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
6449
  }
6450
#endif /*HAVE_QUERY_CACHE*/
6451 6452 6453 6454 6455
  /*
    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
6456
  {
6457
    if ((options & REFRESH_READ_LOCK) && thd)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6458
    {
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
6459 6460 6461 6462
      /*
	Writing to the binlog could cause deadlocks, as we don't log
	UNLOCK TABLES
      */
6463
      tmp_write_to_binlog= 0;
6464 6465
      if (lock_global_read_lock(thd))
	return 1;
6466 6467
      result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1,
                                 tables);
6468 6469 6470 6471 6472 6473
      if (make_global_read_lock_block_commit(thd))
      {
        /* Don't leave things in a half-locked state */
        unlock_global_read_lock(thd);
        return 1;
      }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6474
    }
6475 6476
    else
      result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1, tables);
6477
    my_dbopt_cleanup();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6478 6479 6480
  }
  if (options & REFRESH_HOSTS)
    hostname_cache_refresh();
monty@mysql.com's avatar
monty@mysql.com committed
6481
  if (thd && (options & REFRESH_STATUS))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6482 6483 6484
    refresh_status();
  if (options & REFRESH_THREADS)
    flush_thread_cache();
6485
#ifdef HAVE_REPLICATION
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6486
  if (options & REFRESH_MASTER)
6487 6488
  {
    tmp_write_to_binlog= 0;
6489 6490
    if (reset_master(thd))
      result=1;
6491
  }
6492
#endif
6493
#ifdef OPENSSL
6494 6495 6496 6497 6498 6499
   if (options & REFRESH_DES_KEY_FILE)
   {
     if (des_key_file)
       result=load_des_key_file(des_key_file);
   }
#endif
6500
#ifdef HAVE_REPLICATION
6501 6502
 if (options & REFRESH_SLAVE)
 {
6503
   tmp_write_to_binlog= 0;
6504
   pthread_mutex_lock(&LOCK_active_mi);
6505
   if (reset_slave(thd, active_mi))
6506
     result=1;
6507
   pthread_mutex_unlock(&LOCK_active_mi);
6508
 }
6509
#endif
6510
 if (options & REFRESH_USER_RESOURCES)
monty@mysql.com's avatar
monty@mysql.com committed
6511
   reset_mqh((LEX_USER *) NULL);
6512 6513
 if (write_to_binlog)
   *write_to_binlog= tmp_write_to_binlog;
6514
 return result;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6515 6516
}

6517 6518 6519 6520 6521 6522 6523 6524 6525 6526 6527 6528
/*
  kill on thread

  SYNOPSIS
    kill_one_thread()
    thd			Thread class
    id			Thread id

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

hf@genie.(none)'s avatar
SCRUM  
hf@genie.(none) committed
6529
void kill_one_thread(THD *thd, ulong id, bool only_kill_query)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6530 6531 6532
{
  THD *tmp;
  uint error=ER_NO_SUCH_THREAD;
6533 6534
  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For unlink from list
  I_List_iterator<THD> it(threads);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6535 6536 6537 6538
  while ((tmp=it++))
  {
    if (tmp->thread_id == id)
    {
6539 6540
      pthread_mutex_lock(&tmp->LOCK_delete);	// Lock from delete
      break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6541 6542 6543
    }
  }
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
6544 6545 6546 6547 6548
  if (tmp)
  {
    if ((thd->master_access & SUPER_ACL) ||
	!strcmp(thd->user,tmp->user))
    {
hf@genie.(none)'s avatar
SCRUM  
hf@genie.(none) committed
6549
      tmp->awake(only_kill_query ? THD::KILL_QUERY : THD::KILL_CONNECTION);
6550 6551 6552 6553 6554 6555 6556
      error=0;
    }
    else
      error=ER_KILL_DENIED_ERROR;
    pthread_mutex_unlock(&tmp->LOCK_delete);
  }

bk@work.mysql.com's avatar
bk@work.mysql.com committed
6557
  if (!error)
6558
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6559
  else
6560
    my_error(error, MYF(0), id);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6561 6562
}

timour@mysql.com's avatar
timour@mysql.com committed
6563

bk@work.mysql.com's avatar
bk@work.mysql.com committed
6564 6565 6566 6567 6568 6569 6570 6571
/* Clear most status variables */

static void refresh_status(void)
{
  pthread_mutex_lock(&LOCK_status);
  for (struct show_var_st *ptr=status_vars; ptr->name; ptr++)
  {
    if (ptr->type == SHOW_LONG)
6572
      *(ulong*) ptr->value= 0;
6573 6574 6575 6576 6577 6578 6579
    else if (ptr->type == SHOW_LONG_STATUS)
    {
      THD *thd= current_thd;
      /* We must update the global status before cleaning up the thread */
      add_to_status(&global_status_var, &thd->status_var);
      bzero((char*) &thd->status_var, sizeof(thd->status_var));
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6580
  }
timour@mysql.com's avatar
timour@mysql.com committed
6581 6582
  /* Reset the counters of all key caches (default and named). */
  process_key_caches(reset_key_cache_counters);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
6583 6584
  pthread_mutex_unlock(&LOCK_status);
}
6585 6586 6587 6588


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

6589 6590
static bool append_file_to_dir(THD *thd, const char **filename_ptr,
			       const char *table_name)
6591
{
6592
  char buff[FN_REFLEN],*ptr, *end;
6593 6594 6595 6596 6597 6598 6599
  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))
  {
6600
    my_error(ER_WRONG_TABLE_NAME, MYF(0), *filename_ptr);
6601 6602 6603 6604
    return 1;
  }
  /* Fix is using unix filename format on dos */
  strmov(buff,*filename_ptr);
6605
  end=convert_dirname(buff, *filename_ptr, NullS);
6606
  if (!(ptr=thd->alloc((uint) (end-buff)+(uint) strlen(table_name)+1)))
6607 6608
    return 1;					// End of memory
  *filename_ptr=ptr;
6609
  strxmov(ptr,buff,table_name,NullS);
6610 6611
  return 0;
}
6612

6613

6614 6615 6616 6617 6618 6619 6620 6621 6622 6623 6624 6625 6626 6627
/*
  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;
6628 6629
  LEX *lex= thd->lex;
  if (lex->current_select != &lex->select_lex)
6630 6631
  {
    char command[80];
6632 6633
    strmake(command, lex->yylval->symbol.str,
	    min(lex->yylval->symbol.length, sizeof(command)-1));
6634
    my_error(ER_CANT_USE_OPTION_HERE, MYF(0), command);
6635 6636 6637 6638
    return 1;
  }
  return 0;
}
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bell@sanja.is.com.ua committed
6639

6640 6641 6642 6643 6644 6645 6646 6647 6648 6649 6650 6651 6652 6653 6654 6655
/*
  Setup locking for multi-table updates. Used by the replication slave.
  Replication slave SQL thread examines (all_tables_not_ok()) the
  locking state of referenced tables to determine if the query has to
  be executed or ignored. Since in multi-table update, the 
  'default' lock is read-only, this lock is corrected early enough by
  calling this function, before the slave decides to execute/ignore.

  SYNOPSIS
    check_multi_update_lock()
    thd		Current thread

  RETURN VALUES
    0	ok
    1	error
*/
6656
static bool check_multi_update_lock(THD *thd)
6657 6658
{
  bool res= 1;
6659 6660
  LEX *lex= thd->lex;
  TABLE_LIST *table, *tables= lex->query_tables;
6661 6662 6663 6664 6665 6666 6667 6668 6669
  DBUG_ENTER("check_multi_update_lock");
  
  if (check_db_used(thd, tables))
    goto error;

  /*
    Ensure that we have UPDATE or SELECT privilege for each table
    The exact privilege is checked in mysql_multi_update()
  */
6670
  for (table= tables ; table ; table= table->next_local)
6671
  {
6672 6673
    TABLE_LIST *save= table->next_local;
    table->next_local= 0;
6674 6675 6676
    if ((check_access(thd, UPDATE_ACL, table->db, &table->grant.privilege,0,1) ||
        (grant_option && check_grant(thd, UPDATE_ACL, table,0,1,1))) &&
	check_one_table_access(thd, SELECT_ACL, table))
6677
	goto error;
6678
    table->next_local= save;
6679 6680
  }
    
6681
  if (mysql_multi_update_prepare(thd))
6682 6683 6684 6685 6686 6687 6688
    goto error;
  
  res= 0;
  
error:
  DBUG_RETURN(res);
}
6689

6690

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6691
Comp_creator *comp_eq_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6692
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6693
  return invert?(Comp_creator *)&ne_creator:(Comp_creator *)&eq_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6694 6695
}

6696

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6697
Comp_creator *comp_ge_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6698
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6699
  return invert?(Comp_creator *)&lt_creator:(Comp_creator *)&ge_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6700 6701
}

6702

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6703
Comp_creator *comp_gt_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6704
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6705
  return invert?(Comp_creator *)&le_creator:(Comp_creator *)&gt_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6706 6707
}

6708

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6709
Comp_creator *comp_le_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6710
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6711
  return invert?(Comp_creator *)&gt_creator:(Comp_creator *)&le_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6712 6713
}

6714

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6715
Comp_creator *comp_lt_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6716
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6717
  return invert?(Comp_creator *)&ge_creator:(Comp_creator *)&lt_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6718 6719
}

6720

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6721
Comp_creator *comp_ne_creator(bool invert)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6722
{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6723
  return invert?(Comp_creator *)&eq_creator:(Comp_creator *)&ne_creator;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6724
}
6725 6726 6727 6728 6729 6730 6731 6732 6733 6734 6735 6736 6737 6738 6739 6740 6741 6742 6743 6744


/*
  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
6745
  if ((cmp == &comp_eq_creator) && !all)       //  = ANY <=> IN
6746
    return new Item_in_subselect(left_expr, select_lex);
serg@serg.mylan's avatar
serg@serg.mylan committed
6747 6748

  if ((cmp == &comp_ne_creator) && all)        // <> ALL <=> NOT IN
6749 6750 6751
    return new Item_func_not(new Item_in_subselect(left_expr, select_lex));

  Item_allany_subselect *it=
6752
    new Item_allany_subselect(left_expr, (*cmp)(all), select_lex, all);
6753
  if (all)
6754
    return it->upper_item= new Item_func_not_all(it);	/* ALL */
6755

6756
  return it->upper_item= new Item_func_nop_all(it);      /* ANY/SOME */
6757
}
6758 6759


6760 6761 6762 6763 6764 6765 6766 6767 6768 6769 6770 6771
/*
  CREATE INDEX and DROP INDEX are implemented by calling ALTER TABLE with
  the proper arguments.  This isn't very fast but it should work for most
  cases.

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

  One should normally create all indexes with CREATE TABLE or ALTER TABLE.
*/

6772
bool mysql_create_index(THD *thd, TABLE_LIST *table_list, List<Key> &keys)
6773 6774
{
  List<create_field> fields;
6775 6776
  ALTER_INFO alter_info;
  alter_info.flags= ALTER_ADD_INDEX;
6777 6778 6779 6780 6781
  HA_CREATE_INFO create_info;
  DBUG_ENTER("mysql_create_index");
  bzero((char*) &create_info,sizeof(create_info));
  create_info.db_type=DB_TYPE_DEFAULT;
  create_info.default_table_charset= thd->variables.collation_database;
6782
  DBUG_RETURN(mysql_alter_table(thd,table_list->db,table_list->table_name,
6783
				&create_info, table_list,
6784
				fields, keys, 0, (ORDER*)0,
monty@mysql.com's avatar
monty@mysql.com committed
6785
				DUP_ERROR, 0, &alter_info, 1));
6786 6787 6788
}


6789
bool mysql_drop_index(THD *thd, TABLE_LIST *table_list, ALTER_INFO *alter_info)
6790 6791 6792 6793 6794 6795 6796 6797
{
  List<create_field> fields;
  List<Key> keys;
  HA_CREATE_INFO create_info;
  DBUG_ENTER("mysql_drop_index");
  bzero((char*) &create_info,sizeof(create_info));
  create_info.db_type=DB_TYPE_DEFAULT;
  create_info.default_table_charset= thd->variables.collation_database;
6798 6799
  alter_info->clear();
  alter_info->flags= ALTER_DROP_INDEX;
6800
  DBUG_RETURN(mysql_alter_table(thd,table_list->db,table_list->table_name,
6801
				&create_info, table_list,
6802
				fields, keys, 0, (ORDER*)0,
monty@mysql.com's avatar
monty@mysql.com committed
6803
				DUP_ERROR, 0, alter_info, 1));
6804
}
bell@sanja.is.com.ua's avatar
merge  
bell@sanja.is.com.ua committed
6805 6806


6807 6808 6809 6810 6811
/*
  Multi update query pre-check

  SYNOPSIS
    multi_update_precheck()
6812
    thd		Thread handler
bell@sanja.is.com.ua's avatar
VIEW  
bell@sanja.is.com.ua committed
6813
    tables	Global/local table list (have to be the same)
6814

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6815
  RETURN VALUE
6816 6817
    FALSE OK
    TRUE  Error
6818
*/
6819

6820
bool multi_update_precheck(THD *thd, TABLE_LIST *tables)
6821 6822 6823 6824 6825
{
  const char *msg= 0;
  TABLE_LIST *table;
  LEX *lex= thd->lex;
  SELECT_LEX *select_lex= &lex->select_lex;
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VIEW  
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6826
  DBUG_ENTER("multi_update_precheck");
6827 6828 6829

  if (select_lex->item_list.elements != lex->value_list.elements)
  {
6830
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
6831
    DBUG_RETURN(TRUE);
6832 6833 6834 6835 6836
  }
  /*
    Ensure that we have UPDATE or SELECT privilege for each table
    The exact privilege is checked in mysql_multi_update()
  */
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VIEW  
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6837
  for (table= tables; table; table= table->next_local)
6838
  {
6839 6840 6841 6842 6843 6844
    if (table->derived)
      table->grant.privilege= SELECT_ACL;
    else if ((check_access(thd, UPDATE_ACL, table->db,
                           &table->grant.privilege, 0, 1) ||
              grant_option &&
              check_grant(thd, UPDATE_ACL, table, 0, 1, 1)) &&
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monty@mysql.com committed
6845 6846 6847
             (check_access(thd, SELECT_ACL, table->db,
                           &table->grant.privilege, 0, 0) ||
              grant_option && check_grant(thd, SELECT_ACL, table, 0, 1, 0)))
6848
      DBUG_RETURN(TRUE);
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bell@sanja.is.com.ua committed
6849

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VIEW  
bell@sanja.is.com.ua committed
6850
    table->table_in_first_from_clause= 1;
6851
  }
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6852 6853 6854
  /*
    Is there tables of subqueries?
  */
6855
  if (&lex->select_lex != lex->all_selects_list || lex->time_zone_tables_used)
6856
  {
6857
    DBUG_PRINT("info",("Checking sub query list"));
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VIEW  
bell@sanja.is.com.ua committed
6858
    for (table= tables; table; table= table->next_global)
6859
    {
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6860 6861 6862
      if (!my_tz_check_n_skip_implicit_tables(&table,
                                              lex->time_zone_tables_used) &&
          !table->table_in_first_from_clause)
6863 6864 6865
      {
	if (check_access(thd, SELECT_ACL, table->db,
			 &table->grant.privilege, 0, 0) ||
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6866
	    grant_option && check_grant(thd, SELECT_ACL, table, 0, 1, 0))
6867
	  DBUG_RETURN(TRUE);
6868 6869 6870 6871 6872 6873
      }
    }
  }

  if (select_lex->order_list.elements)
    msg= "ORDER BY";
6874
  else if (select_lex->select_limit)
6875 6876 6877 6878
    msg= "LIMIT";
  if (msg)
  {
    my_error(ER_WRONG_USAGE, MYF(0), "UPDATE", msg);
6879
    DBUG_RETURN(TRUE);
6880
  }
6881
  DBUG_RETURN(FALSE);
6882 6883 6884 6885 6886 6887 6888
}

/*
  Multi delete query pre-check

  SYNOPSIS
    multi_delete_precheck()
6889
    thd			Thread handler
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VIEW  
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6890
    tables		Global/local table list
6891

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6892
  RETURN VALUE
6893 6894
    FALSE OK
    TRUE  error
6895
*/
6896

6897
bool multi_delete_precheck(THD *thd, TABLE_LIST *tables)
6898 6899 6900 6901
{
  SELECT_LEX *select_lex= &thd->lex->select_lex;
  TABLE_LIST *aux_tables=
    (TABLE_LIST *)thd->lex->auxilliary_table_list.first;
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VIEW  
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6902
  DBUG_ENTER("multi_delete_precheck");
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bell@sanja.is.com.ua committed
6903

6904 6905 6906 6907 6908
  /* sql_yacc guarantees that tables and aux_tables are not zero */
  DBUG_ASSERT(aux_tables != 0);
  if (check_db_used(thd, tables) || check_db_used(thd,aux_tables) ||
      check_table_access(thd,SELECT_ACL, tables,0) ||
      check_table_access(thd,DELETE_ACL, aux_tables,0))
6909
    DBUG_RETURN(TRUE);
6910 6911
  if ((thd->options & OPTION_SAFE_UPDATES) && !select_lex->where)
  {
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6912 6913
    my_message(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE,
               ER(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE), MYF(0));
6914
    DBUG_RETURN(TRUE);
6915
  }
6916 6917 6918 6919 6920 6921 6922 6923 6924 6925 6926 6927 6928 6929 6930 6931 6932 6933 6934 6935 6936 6937 6938 6939 6940 6941 6942
  DBUG_RETURN(FALSE);
}


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

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

  RETURN VALUE
    FALSE - success
    TRUE  - error
*/

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

  lex->table_count= 0;

  for (target_tbl= (TABLE_LIST *)lex->auxilliary_table_list.first;
       target_tbl; target_tbl= target_tbl->next_local)
6943
  {
6944
    lex->table_count++;
6945 6946
    /* All tables in aux_tables must be found in FROM PART */
    TABLE_LIST *walk;
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VIEW  
bell@sanja.is.com.ua committed
6947
    for (walk= tables; walk; walk= walk->next_local)
6948
    {
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bell@sanja.is.com.ua committed
6949 6950 6951
      if (!my_strcasecmp(table_alias_charset,
			 target_tbl->alias, walk->alias) &&
	  !strcmp(walk->db, target_tbl->db))
6952 6953 6954 6955
	break;
    }
    if (!walk)
    {
6956
      my_error(ER_UNKNOWN_TABLE, MYF(0),
6957
               target_tbl->table_name, "MULTI DELETE");
6958
      DBUG_RETURN(TRUE);
6959
    }
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bell@sanja.is.com.ua committed
6960
    walk->lock_type= target_tbl->lock_type;
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VIEW  
bell@sanja.is.com.ua committed
6961
    target_tbl->correspondent_table= walk;	// Remember corresponding table
6962
  }
6963
  DBUG_RETURN(FALSE);
6964 6965 6966
}


bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6967 6968 6969 6970 6971
/*
  simple UPDATE query pre-check

  SYNOPSIS
    update_precheck()
6972 6973
    thd		Thread handler
    tables	Global table list
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6974 6975

  RETURN VALUE
6976 6977
    FALSE OK
    TRUE  Error
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bell@sanja.is.com.ua committed
6978
*/
6979

6980
bool update_precheck(THD *thd, TABLE_LIST *tables)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6981 6982 6983 6984
{
  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
6985
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
6986
    DBUG_RETURN(TRUE);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
6987
  }
6988 6989
  DBUG_RETURN(check_db_used(thd, tables) ||
	       check_one_table_access(thd, UPDATE_ACL, tables));
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bell@sanja.is.com.ua committed
6990 6991 6992 6993 6994 6995 6996 6997
}


/*
  simple DELETE query pre-check

  SYNOPSIS
    delete_precheck()
6998 6999
    thd		Thread handler
    tables	Global table list
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7000 7001

  RETURN VALUE
7002 7003
    FALSE  OK
    TRUE   error
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bell@sanja.is.com.ua committed
7004
*/
7005

7006
bool delete_precheck(THD *thd, TABLE_LIST *tables)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7007 7008 7009
{
  DBUG_ENTER("delete_precheck");
  if (check_one_table_access(thd, DELETE_ACL, tables))
7010
    DBUG_RETURN(TRUE);
7011
  /* Set privilege for the WHERE clause */
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bell@sanja.is.com.ua committed
7012
  tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
7013
  DBUG_RETURN(FALSE);
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bell@sanja.is.com.ua committed
7014 7015 7016 7017 7018 7019 7020 7021
}


/*
  simple INSERT query pre-check

  SYNOPSIS
    insert_precheck()
7022 7023
    thd		Thread handler
    tables	Global table list
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bell@sanja.is.com.ua committed
7024 7025

  RETURN VALUE
7026 7027
    FALSE  OK
    TRUE   error
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bell@sanja.is.com.ua committed
7028
*/
7029

bell@sanja.is.com.ua's avatar
merge  
bell@sanja.is.com.ua committed
7030
bool insert_precheck(THD *thd, TABLE_LIST *tables)
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bell@sanja.is.com.ua committed
7031 7032 7033 7034
{
  LEX *lex= thd->lex;
  DBUG_ENTER("insert_precheck");

7035 7036 7037 7038
  /*
    Check that we have modify privileges for the first table and
    select privileges for the rest
  */
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monty@mysql.com committed
7039 7040 7041
  ulong privilege= (INSERT_ACL |
                    (lex->duplicates == DUP_REPLACE ? DELETE_ACL : 0) |
                    (lex->value_list.elements ? UPDATE_ACL : 0));
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bell@sanja.is.com.ua committed
7042 7043

  if (check_one_table_access(thd, privilege, tables))
7044
    DBUG_RETURN(TRUE);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7045

7046
  if (lex->update_list.elements != lex->value_list.elements)
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bell@sanja.is.com.ua committed
7047
  {
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bell@sanja.is.com.ua committed
7048
    my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0));
7049
    DBUG_RETURN(TRUE);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
7050
  }
7051
  DBUG_RETURN(FALSE);
7052
}
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bell@sanja.is.com.ua committed
7053 7054 7055 7056 7057 7058 7059


/*
  CREATE TABLE query pre-check

  SYNOPSIS
    create_table_precheck()
7060 7061 7062
    thd			Thread handler
    tables		Global table list
    create_table	Table which will be created
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bell@sanja.is.com.ua committed
7063 7064

  RETURN VALUE
7065 7066
    FALSE   OK
    TRUE   Error
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bell@sanja.is.com.ua committed
7067
*/
7068

7069 7070
bool create_table_precheck(THD *thd, TABLE_LIST *tables,
                           TABLE_LIST *create_table)
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bell@sanja.is.com.ua committed
7071 7072
{
  LEX *lex= thd->lex;
7073 7074
  SELECT_LEX *select_lex= &lex->select_lex;
  ulong want_priv;
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merge  
bell@sanja.is.com.ua committed
7075
  bool error= TRUE;                                 // Error message is given
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bell@sanja.is.com.ua committed
7076
  DBUG_ENTER("create_table_precheck");
7077 7078 7079

  want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
              CREATE_TMP_ACL : CREATE_ACL);
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7080 7081 7082 7083 7084 7085
  lex->create_info.alias= create_table->alias;
  if (check_access(thd, want_priv, create_table->db,
		   &create_table->grant.privilege, 0, 0) ||
      check_merge_table_access(thd, create_table->db,
			       (TABLE_LIST *)
			       lex->create_info.merge_list.first))
7086 7087 7088 7089 7090 7091 7092 7093 7094
    goto err;
  if (grant_option && want_priv != CREATE_TMP_ACL &&
      check_grant(thd, want_priv, create_table, 0, UINT_MAX, 0))
    goto err;

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

7095 7096
#ifdef NOT_NECESSARY_TO_CHECK_CREATE_TABLE_EXIST_WHEN_PREPARING_STATEMENT
    /* This code throws an ill error for CREATE TABLE t1 SELECT * FROM t1 */
7097
    /*
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monty@mysql.com committed
7098 7099 7100
      Only do the check for PS, becasue we on execute we have to check that
      against the opened tables to ensure we don't use a table that is part
      of the view (which can only be done after the table has been opened).
7101
    */
7102
    if (thd->current_arena->is_stmt_prepare_or_first_sp_execute())
7103
    {
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monty@mysql.com committed
7104 7105 7106 7107
      /*
        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
7108
          find_table_in_global_list(tables, create_table->db,
7109
                                    create_table->table_name))
monty@mysql.com's avatar
monty@mysql.com committed
7110
      {
7111
	error= FALSE;
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monty@mysql.com committed
7112 7113 7114
        goto err;
      }
    }
7115
#endif
7116 7117 7118
    if (tables && check_table_access(thd, SELECT_ACL, tables,0))
      goto err;
  }
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merge  
bell@sanja.is.com.ua committed
7119
  error= FALSE;
7120 7121 7122

err:
  DBUG_RETURN(error);
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bell@sanja.is.com.ua committed
7123
}
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7124 7125 7126 7127 7128 7129 7130


/*
  negate given expression

  SYNOPSIS
    negate_expression()
7131
    thd  thread handler
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7132 7133 7134 7135 7136 7137 7138 7139 7140 7141 7142 7143 7144 7145 7146 7147 7148 7149 7150 7151 7152 7153 7154 7155 7156 7157 7158 7159
    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);
}