sql_parse.cc 167 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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#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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#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, TABLE_LIST *tables, 
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				    List<Item> *fields, SELECT_LEX *select_lex);
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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",
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  "Error"					// Last command number
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};

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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;
    thd->locked_tables=0;			// Will be automaticly closed
    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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  if (thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN |
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		      OPTION_TABLE_LOCK))
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  {
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    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
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    if (ha_commit(thd))
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      error=1;
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  }
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  return error;
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}


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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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      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->user_len= user_len;
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    uc->host= uc->user + uc->user_len +  1;
    uc->len= temp_len;
    uc->connections= 0;
    uc->questions= uc->updates= uc->conn_per_hour=0;
    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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      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.
    passwd       scrambled password recieved from client
    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.
    Current implementation does not depened 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: OK or FAIL is sent in mysql_change_db */
  if (db && db[0])
  {
    thd->db= 0;
    thd->db_length= 0;
    if (mysql_change_db(thd, db))
    {
      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(thd, ER_NOT_SUPPORTED_AUTH_MODE);
    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 
    connection is closed. We don't want to accidently free a wrong pointer
    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(thd, ER_SERVER_IS_IN_SECURE_AUTH_MODE,
                 thd->user, thd->host_or_ip);
      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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    if (send_old_password_request(thd) ||
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        my_net_read(net) != SCRAMBLE_LENGTH_323 + 1) // We have to read very
    {                                                // specific packet size
      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)) // authentification 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));
        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)
        {                                         // too many connections 
          send_error(thd, ER_CON_COUNT_ERROR);
          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.connections ||
	   max_user_connections) &&
	  get_or_create_user_conn(thd,thd->user,thd->host_or_ip,&ur))
	DBUG_RETURN(-1);
      if (thd->user_connect &&
	  (thd->user_connect->user_resources.connections ||
	   max_user_connections) &&
	  check_for_max_user_connections(thd, thd->user_connect))
	DBUG_RETURN(-1);
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      /* Change database if necessary: OK or FAIL is sent in mysql_change_db */
      if (db && db[0])
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      {
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        if (mysql_change_db(thd, db))
        {
          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(thd, ER_NOT_SUPPORTED_AUTH_MODE);
    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(thd, ER_ACCESS_DENIED_ERROR,
             thd->user,
             thd->host_or_ip,
             passwd_len ? ER(ER_YES) : ER(ER_NO));
  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 &&
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      max_user_connections < (uint) uc->connections)
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  {
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    net_printf(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.connections &&
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      uc->user_resources.connections <= uc->conn_per_hour)
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  {
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    net_printf(thd, ER_USER_LIMIT_REACHED, uc->user,
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	       "max_connections_per_hour",
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	       (long) uc->user_resources.connections);
    error=1;
    goto end;
  }
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  uc->conn_per_hour++;
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  end:
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  if (error)
    uc->connections--; // no need for decrease_user_connections() here
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  (void) pthread_mutex_unlock(&LOCK_user_conn);
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  DBUG_RETURN(error);
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}
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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/*
  Decrease user connection count

  SYNOPSIS
    decrease_user_connections()
    uc			User connection object

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

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

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

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

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/*
  Mark all commands that somehow changes a table
  This is used to check number of updates / hour
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  sql_command is actually set to SQLCOM_END sometimes
  so we need the +1 to include it in the array.
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*/

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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;
  uc_update_queries[SQLCOM_UPDATE]=1;
  uc_update_queries[SQLCOM_INSERT]=1;
  uc_update_queries[SQLCOM_INSERT_SELECT]=1;
  uc_update_queries[SQLCOM_DELETE]=1;
  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;
  uc_update_queries[SQLCOM_REPLACE]=1;
  uc_update_queries[SQLCOM_REPLACE_SELECT]=1;
  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_DELETE_MULTI]=1;
  uc_update_queries[SQLCOM_DROP_INDEX]=1;
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  uc_update_queries[SQLCOM_UPDATE_MULTI]=1;
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}

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bool is_update_query(enum enum_sql_command command)
{
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  DBUG_ASSERT(command >= 0 && command <= SQLCOM_END);
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  return uc_update_queries[command];
}
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/*
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  Reset per-hour user resource limits when it has been more than
  an hour since they were last checked
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  SYNOPSIS:
    time_out_user_resource_limits()
    thd			Thread handler
    uc			User connection details
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  NOTE:
    This assumes that the LOCK_user_conn mutex has been acquired, so it is
    safe to test and modify members of the USER_CONN structure.
*/
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static void time_out_user_resource_limits(THD *thd, USER_CONN *uc)
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{
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  time_t check_time = thd->start_time ?  thd->start_time : time(NULL);
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  DBUG_ENTER("time_out_user_resource_limits");
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  /* If more than a hour since last check, reset resource checking */
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  if (check_time  - uc->intime >= 3600)
  {
    uc->questions=1;
    uc->updates=0;
    uc->conn_per_hour=0;
    uc->intime=check_time;
  }
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  DBUG_VOID_RETURN;
}


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

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

  (void) pthread_mutex_lock(&LOCK_user_conn);

  time_out_user_resource_limits(thd, uc);

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

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

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    memcpy(temp_user,lu->user.str,lu->user.length);
    memcpy(temp_user+lu->user.length+1,lu->host.str,lu->host.length);
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    temp_user[lu->user.length]='\0'; temp_user[temp_len-1]=0;
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    if ((uc = (struct  user_conn *) hash_search(&hash_user_connections,
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						(byte*) temp_user, temp_len)))
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    {
      uc->questions=0;
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      get_mqh(temp_user,&temp_user[lu->user.length+1],uc);
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      uc->updates=0;
      uc->conn_per_hour=0;
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    }
  }
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  else // for FLUSH PRIVILEGES and FLUSH USER_RESOURCES
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  {
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    for (uint idx=0;idx < hash_user_connections.records; idx++)
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    {
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      USER_CONN *uc=(struct user_conn *) hash_element(&hash_user_connections,
						      idx);
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      if (get_them)
	get_mqh(uc->user,uc->host,uc);
      uc->questions=0;
      uc->updates=0;
      uc->conn_per_hour=0;
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    }
  }
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  (void) pthread_mutex_unlock(&LOCK_user_conn);
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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}
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/*
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    Perform handshake, authorize client and update thd ACL variables.
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  SYNOPSIS
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    check_connection()
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    thd  thread handle
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  RETURN
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     0  success, OK is sent to user, thd is updated.
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    -1  error, which is sent to user
   > 0  error code (not sent to user)
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*/

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

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  if (!thd->host)                           // If TCP/IP connection
  {
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    char ip[30];
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    if (vio_peer_addr(net->vio, ip, &thd->peer_port))
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      return (ER_BAD_HOST_ERROR);
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    if (!(thd->ip= my_strdup(ip,MYF(0))))
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      return (ER_OUT_OF_RESOURCES);
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    thd->host_or_ip= thd->ip;
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    vio_in_addr(net->vio,&thd->remote.sin_addr);
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#if !defined(HAVE_SYS_UN_H) || defined(HAVE_mit_thread)
    /* Fast local hostname resolve for Win32 */
    if (!strcmp(thd->ip,"127.0.0.1"))
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    {
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      thd->host= (char*) my_localhost;
      thd->host_or_ip= my_localhost;
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    }
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    else
#endif
    {
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      if (!(specialflag & SPECIAL_NO_RESOLVE))
      {
	vio_in_addr(net->vio,&thd->remote.sin_addr);
	thd->host=ip_to_hostname(&thd->remote.sin_addr,&connect_errors);
	/* Cut very long hostnames to avoid possible overflows */
	if (thd->host)
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	{
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	  thd->host[min(strlen(thd->host), HOSTNAME_LENGTH)]= 0;
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	  thd->host_or_ip= thd->host;
	}
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	if (connect_errors > max_connect_errors)
	  return(ER_HOST_IS_BLOCKED);
      }
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    }
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    DBUG_PRINT("info",("Host: %s  ip: %s",
		       thd->host ? thd->host : "unknown host",
		       thd->ip ? thd->ip : "unknown ip"));
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    if (acl_check_host(thd->host,thd->ip))
      return(ER_HOST_NOT_PRIVILEGED);
  }
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  else /* Hostname given means that the connection was on a socket */
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  {
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    DBUG_PRINT("info",("Host: %s",thd->host));
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    thd->host_or_ip= thd->host;
    thd->ip= 0;
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    /* Reset sin_addr */
    bzero((char*) &thd->remote, sizeof(thd->remote));
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  }
  vio_keepalive(net->vio, TRUE);
  {
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    /* buff[] needs to big enough to hold the server_version variable */
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    char buff[SERVER_VERSION_LENGTH + SCRAMBLE_LENGTH + 64];
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    ulong client_flags = (CLIENT_LONG_FLAG | CLIENT_CONNECT_WITH_DB |
			  CLIENT_PROTOCOL_41 | CLIENT_SECURE_CONNECTION);
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    if (opt_using_transactions)
      client_flags|=CLIENT_TRANSACTIONS;
#ifdef HAVE_COMPRESS
    client_flags |= CLIENT_COMPRESS;
#endif /* HAVE_COMPRESS */
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#ifdef HAVE_OPENSSL
    if (ssl_acceptor_fd)
      client_flags |= CLIENT_SSL;       /* Wow, SSL is avalaible! */
#endif /* HAVE_OPENSSL */
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    end= strnmov(buff, server_version, SERVER_VERSION_LENGTH) + 1;
    int4store((uchar*) end, thd->thread_id);
    end+= 4;
    /*
      So as check_connection is the only entry point to authorization
      procedure, scramble is set here. This gives us new scramble for
      each handshake.
    */
    create_random_string(thd->scramble, SCRAMBLE_LENGTH, &thd->rand);
    /*
      Old clients does not understand long scrambles, but can ignore packet
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      tail: that's why first part of the scramble is placed here, and second
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      part at the end of packet.
    */
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    end= strmake(end, thd->scramble, SCRAMBLE_LENGTH_323) + 1;
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    int2store(end, client_flags);
    /* write server characteristics: up to 16 bytes allowed */
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    end[2]=(char) default_charset_info->number;
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    int2store(end+3, thd->server_status);
    bzero(end+5, 13);
    end+= 18;
    /* write scramble tail */
    end= strmake(end, thd->scramble + SCRAMBLE_LENGTH_323, 
                 SCRAMBLE_LENGTH - SCRAMBLE_LENGTH_323) + 1;

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

  thd->client_capabilities=uint2korr(net->read_pos);
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#ifdef TO_BE_REMOVED_IN_4_1_RELEASE
  /*
    This is just a safety check against any client that would use the old
    CLIENT_CHANGE_USER flag
  */
  if ((thd->client_capabilities & CLIENT_PROTOCOL_41) &&
      !(thd->client_capabilities & (CLIENT_RESERVED |
				    CLIENT_SECURE_CONNECTION |
				    CLIENT_MULTI_RESULTS)))
    thd->client_capabilities&= ~CLIENT_PROTOCOL_41;
#endif
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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
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      - opt_character_set_client_handshake is not set
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      - client has not specified a character set
      - client character set is the same as the servers
      - client character set doesn't exists in server
    */
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    if (!opt_character_set_client_handshake ||
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        !(thd->variables.character_set_client=
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	  get_charset((uint) net->read_pos[8], MYF(0))) ||
	!my_strcasecmp(&my_charset_latin1,
		       global_system_variables.character_set_client->name,
		       thd->variables.character_set_client->name))
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    {
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      thd->variables.character_set_client=
	global_system_variables.character_set_client;
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      thd->variables.collation_connection=
	global_system_variables.collation_connection;
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      thd->variables.character_set_results=
	global_system_variables.character_set_results;
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    }
    else
    {
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      thd->variables.character_set_results=
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      thd->variables.collation_connection= 
	thd->variables.character_set_client;
    }
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    thd->update_charset();
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    end= (char*) net->read_pos+32;
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  }
  else
  {
    thd->max_client_packet_length= uint3korr(net->read_pos+2);
    end= (char*) net->read_pos+5;
  }

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

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

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

  /*
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    Old clients send null-terminated string as password; new clients send
    the size (1 byte) + string (not null-terminated). Hence in case of empty
    password both send '\0'.
  */
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  uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ?
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    *passwd++ : strlen(passwd);
  db= thd->client_capabilities & CLIENT_CONNECT_WITH_DB ?
    db + passwd_len + 1 : 0;
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  /* Since 4.1 all database names are stored in utf8 */
  if (db)
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  {
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    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
                             system_charset_info,
                             db, strlen(db),
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                             thd->charset(), &dummy_errors)]= 0;
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    db= db_buff;
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  }
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  user_buff[copy_and_convert(user_buff, sizeof(user_buff)-1,
                             system_charset_info, user, strlen(user),
                             thd->charset(), &dummy_errors)]= '\0';
  user= user_buff;
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  if (thd->user)
    x_free(thd->user);
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  if (!(thd->user= my_strdup(user, MYF(0))))
    return (ER_OUT_OF_RESOURCES);
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  return check_user(thd, COM_CONNECT, passwd, passwd_len, db, TRUE);
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}

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void execute_init_command(THD *thd, sys_var_str *init_command_var,
			  rw_lock_t *var_mutex)
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{
  Vio* save_vio;
  ulong save_client_capabilities;

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


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pthread_handler_decl(handle_one_connection,arg)
{
  THD *thd=(THD*) arg;
  uint launch_time  =
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    (uint) ((thd->thr_create_time = time(NULL)) - thd->connect_time);
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  if (launch_time >= slow_launch_time)
    statistic_increment(slow_launch_threads,&LOCK_status );

  pthread_detach_this_thread();

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#if !defined( __WIN__) && !defined(OS2)	// Win32 calls this in pthread_create
  // The following calls needs to be done before we call DBUG_ macros
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  if (!(test_flags & TEST_NO_THREADS) & my_thread_init())
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  {
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    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
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    statistic_increment(aborted_connects,&LOCK_status);
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    end_thread(thd,0);
    return 0;
  }
#endif

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

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#if defined(__WIN__)
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  init_signals();				// IRENA; testing ?
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#elif !defined(OS2) && !defined(__NETWARE__)
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  sigset_t set;
  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
#endif
  if (thd->store_globals())
  {
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    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
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    statistic_increment(aborted_connects,&LOCK_status);
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    end_thread(thd,0);
    return 0;
  }

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

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    if ((error=check_connection(thd)))
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    {						// Wrong permissions
      if (error > 0)
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	net_printf(thd,error,thd->host_or_ip);
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#ifdef __NT__
      if (vio_type(net->vio) == VIO_TYPE_NAMEDPIPE)
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	my_sleep(1000);				/* must wait after eof() */
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#endif
1024
      statistic_increment(aborted_connects,&LOCK_status);
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      goto end_thread;
    }
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#ifdef __NETWARE__
    netware_reg_user(thd->ip, thd->user, "MySQL");
#endif
1030
    if (thd->variables.max_join_size == HA_POS_ERROR)
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      thd->options |= OPTION_BIG_SELECTS;
    if (thd->client_capabilities & CLIENT_COMPRESS)
      net->compress=1;				// Use compression

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    thd->version= refresh_version;
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    thd->proc_info= 0;
    thd->set_time();
    thd->init_for_queries();
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    if (sys_init_connect.value_length && !(thd->master_access & SUPER_ACL))
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    {
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      execute_init_command(thd, &sys_init_connect, &LOCK_sys_init_connect);
      if (thd->query_error)
	thd->killed= 1;
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    }
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    while (!net->error && net->vio != 0 && !thd->killed)
    {
      if (do_command(thd))
	break;
    }
1050 1051
    if (thd->user_connect)
      decrease_user_connections(thd->user_connect);
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    free_root(thd->mem_root,MYF(0));
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    if (net->error && net->vio != 0 && net->report_error)
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    {
1055
      if (!thd->killed && thd->variables.log_warnings > 1)
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        sql_print_warning(ER(ER_NEW_ABORTING_CONNECTION),
                          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)));
1062
      send_error(thd,net->last_errno,NullS);
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      statistic_increment(aborted_threads,&LOCK_status);
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    }
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    else if (thd->killed)
    {
      statistic_increment(aborted_threads,&LOCK_status);
    }
1069
    
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end_thread:
1071
    close_connection(thd, 0, 1);
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    end_thread(thd,1);
    /*
      If end_thread returns, we are either running with --one-thread
      or this thread has been schedule to handle the next query
    */
    thd= current_thd;
  } while (!(test_flags & TEST_NO_THREADS));
  /* The following is only executed if we are not using --one-thread */
  return(0);					/* purecov: deadcode */
}

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#endif /* EMBEDDED_LIBRARY */

1085 1086 1087 1088
/*
  Execute commands from bootstrap_file.
  Used when creating the initial grant tables
*/
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1090
extern "C" pthread_handler_decl(handle_bootstrap,arg)
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{
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  THD *thd=(THD*) arg;
  FILE *file=bootstrap_file;
  char *buff;
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1096
  /* The following must be called before DBUG_ENTER */
1097
  if (my_thread_init() || thd->store_globals())
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  {
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#ifndef EMBEDDED_LIBRARY
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    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
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#endif
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    thd->fatal_error();
1103
    goto end;
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  }
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  DBUG_ENTER("handle_bootstrap");

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#ifndef EMBEDDED_LIBRARY
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  pthread_detach_this_thread();
  thd->thread_stack= (char*) &thd;
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#if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__)
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  sigset_t set;
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  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
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#endif
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#endif /* EMBEDDED_LIBRARY */
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  if (thd->variables.max_join_size == HA_POS_ERROR)
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    thd->options |= OPTION_BIG_SELECTS;

  thd->proc_info=0;
  thd->version=refresh_version;
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  thd->priv_user=thd->user=(char*) my_strdup("boot", MYF(MY_WME));
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  buff= (char*) thd->net.buff;
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  thd->init_for_queries();
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  while (fgets(buff, thd->net.max_packet, file))
  {
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    ulong length= (ulong) strlen(buff);
    while (buff[length-1] != '\n' && !feof(file))
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    {
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      /*
        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))
      {
        send_error(thd, thd->net.last_errno, NullS);
        thd->is_fatal_error= 1;
        break;
      }
      buff= (char*) thd->net.buff;
      fgets(buff + length, thd->net.max_packet - length, file);
      length+= (ulong) strlen(buff + length);
1144
    }
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    if (thd->is_fatal_error)
      break;
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    while (length && (my_isspace(thd->charset(), buff[length-1]) ||
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           buff[length-1] == ';'))
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      length--;
    buff[length]=0;
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    thd->query_length=length;
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    thd->query= thd->memdup_w_gap(buff, length+1, thd->db_length+1);
    thd->query[length] = '\0';
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    thd->query_id=query_id++;
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    if (mqh_used && thd->user_connect && check_mqh(thd, SQLCOM_END))
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    {
      thd->net.error = 0;
      close_thread_tables(thd);			// Free tables
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      free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));
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      break;
    }
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    mysql_parse(thd,thd->query,length);
    close_thread_tables(thd);			// Free tables
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    if (thd->is_fatal_error)
1165
      break;
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    free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));
1167
    free_root(&thd->transaction.mem_root,MYF(MY_KEEP_PREALLOC));
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  }
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  /* thd->fatal_error should be set in case something went wrong */
end:
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#ifndef EMBEDDED_LIBRARY
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  (void) pthread_mutex_lock(&LOCK_thread_count);
  thread_count--;
  (void) pthread_mutex_unlock(&LOCK_thread_count);
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  (void) pthread_cond_broadcast(&COND_thread_count);
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  my_thread_end();
  pthread_exit(0);
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#endif
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  DBUG_RETURN(0);				// Never reached
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}

1183
    /* This works because items are allocated with sql_alloc() */
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1185
void free_items(Item *item)
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{
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  for (; item ; item=item->next)
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    item->delete_self();
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}

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

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

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int mysql_table_dump(THD* thd, char* db, char* tbl_name, int fd)
{
  TABLE* table;
  TABLE_LIST* table_list;
  int error = 0;
  DBUG_ENTER("mysql_table_dump");
  db = (db && db[0]) ? db : thd->db;
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  if (!(table_list = (TABLE_LIST*) thd->calloc(sizeof(TABLE_LIST))))
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    DBUG_RETURN(1); // out of memory
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  table_list->db = db;
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  table_list->real_name = table_list->alias = tbl_name;
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  table_list->lock_type = TL_READ_NO_INSERT;
  table_list->next = 0;

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  if (!db || check_db_name(db))
  {
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    net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
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    goto err;
  }
1218
  if (lower_case_table_names)
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    my_casedn_str(files_charset_info, tbl_name);
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  remove_escape(table_list->real_name);
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  if (!(table=open_ltable(thd, table_list, TL_READ_NO_INSERT)))
    DBUG_RETURN(1);

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


1245
#ifndef EMBEDDED_LIBRARY
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/*
  Read one command from socket and execute it (query or simple command).
  This function is called in loop from thread function.
  SYNOPSIS
    do_command()
  RETURN VALUE
    0  success
    1  request of thread shutdown (see dispatch_command() description)
*/

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

  net= &thd->net;
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  /*
    indicator of uninitialized lex => normal flow of errors handling
    (see my_message_sql)
  */
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  thd->lex->current_select= 0;
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  packet=0;
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  old_timeout=net->read_timeout;
  // Wait max for 8 hours
  net->read_timeout=(uint) thd->variables.net_wait_timeout;
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  thd->clear_error();				// Clear error message
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  net_new_transaction(net);
  if ((packet_length=my_net_read(net)) == packet_error)
  {
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    DBUG_PRINT("info",("Got error %d reading command from socket %s",
		       net->error,
		       vio_description(net->vio)));
    /* Check if we can continue without closing the connection */
    if (net->error != 3)
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    {
      statistic_increment(aborted_threads,&LOCK_status);
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      DBUG_RETURN(TRUE);			// We have to close it.
1290
    }
1291
    send_error(thd,net->last_errno,NullS);
1292
    net->error= 0;
1293
    DBUG_RETURN(FALSE);
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  }
  else
  {
    packet=(char*) net->read_pos;
    command = (enum enum_server_command) (uchar) packet[0];
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    if (command >= COM_END)
      command= COM_END;				// Wrong command
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    DBUG_PRINT("info",("Command on %s = %d (%s)",
		       vio_description(net->vio), command,
		       command_name[command]));
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  }
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  net->read_timeout=old_timeout;		// restore it
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  /*
    packet_length contains length of data, as it was stored in packet
    header. In case of malformed header, packet_length can be zero.
    If packet_length is not zero, my_net_read ensures that this number
    of bytes was actually read from network. Additionally my_net_read
    sets packet[packet_length]= 0 (thus if packet_length == 0,
    command == packet[0] == COM_SLEEP).
    In dispatch_command packet[packet_length] points beyond the end of packet.
  */
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  DBUG_RETURN(dispatch_command(command,thd, packet+1, (uint) packet_length));
1316
}
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#endif  /* EMBEDDED_LIBRARY */
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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;
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  bool error= 0;
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  DBUG_ENTER("dispatch_command");

  thd->command=command;
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  /*
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    Commands which always take a long time are logged into
    the slow log only if opt_log_slow_admin_statements is set.
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  */
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  thd->enable_slow_log= TRUE;
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  thd->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)
    query_id++;
  thread_running++;
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  /* TODO: set thd->lex->sql_command to SQLCOM_END here */
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  VOID(pthread_mutex_unlock(&LOCK_thread_count));
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  thd->server_status&=
           ~(SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED);
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  switch (command) {
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  case COM_INIT_DB:
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  {
    LEX_STRING tmp;
    statistic_increment(com_stat[SQLCOM_CHANGE_DB],&LOCK_status);
    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;
  }
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#ifdef HAVE_REPLICATION
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  case COM_REGISTER_SLAVE:
  {
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    if (!register_slave(thd, (uchar*)packet, packet_length))
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      send_ok(thd);
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    break;
  }
1377
#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);

    statistic_increment(com_other, &LOCK_status);
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    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);
    if (mysql_table_dump(thd, db, tbl_name, -1))
      send_error(thd); // dump to NET
    break;
  }
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  case COM_CHANGE_USER:
  {
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    thd->change_user();
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    thd->clear_error();                         // if errors from rollback
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    statistic_increment(com_other, &LOCK_status);
    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).
    */
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    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;
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#ifndef EMBEDDED_LIBRARY
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    /* Small check for incomming packet */
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    if ((uint) ((uchar*) db - net->read_pos) > packet_length)
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    {
      send_error(thd, ER_UNKNOWN_COM_ERROR);
      break;
    }
1418
#endif
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    /* Convert database name to utf8 */
1420
    uint dummy_errors;
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    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
                             system_charset_info, db, strlen(db),
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                             thd->charset(), &dummy_errors)]= 0;
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    db= db_buff;
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    /* Save user and privileges */
    uint save_master_access= thd->master_access;
    uint save_db_access= thd->db_access;
    uint save_db_length= thd->db_length;
    char *save_user= thd->user;
    char *save_priv_user= thd->priv_user;
    char *save_db= thd->db;
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    USER_CONN *save_user_connect= thd->user_connect;
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    if (!(thd->user= my_strdup(user, MYF(0))))
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    {
      thd->user= save_user;
      send_error(thd, ER_OUT_OF_RESOURCES);
      break;
    }
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    /* Clear variables that are allocated */
    thd->user_connect= 0;
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    int res= check_user(thd, COM_CHANGE_USER, passwd, passwd_len, db, FALSE);
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    if (res)
    {
      /* authentification failure, we shall restore old user */
      if (res > 0)
        send_error(thd, ER_UNKNOWN_COM_ERROR);
      x_free(thd->user);
      thd->user= save_user;
      thd->priv_user= save_priv_user;
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      thd->user_connect= save_user_connect;
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      thd->master_access= save_master_access;
      thd->db_access= save_db_access;
      thd->db= save_db;
      thd->db_length= save_db_length;
    }
    else
    {
      /* we've authenticated new user */
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      if (save_user_connect)
	decrease_user_connections(save_user_connect);
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      x_free((gptr) save_db);
      x_free((gptr) save_user);
    }
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    break;
  }
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  case COM_EXECUTE:
  {
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    mysql_stmt_execute(thd, packet, packet_length);
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    break;
  }
  case COM_LONG_DATA:
  {
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    mysql_stmt_get_longdata(thd, packet, packet_length);
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    break;
  }
  case COM_PREPARE:
  {
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    mysql_stmt_prepare(thd, packet, packet_length);
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    break;
  }
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  case COM_CLOSE_STMT:
  {
    mysql_stmt_free(thd, packet);
    break;
  }
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  case COM_RESET_STMT:
  {
    mysql_stmt_reset(thd, packet);
    break;
  }
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  case COM_QUERY:
  {
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    if (alloc_query(thd, packet, packet_length))
      break;					// fatal error is set
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    char *packet_end= thd->query + thd->query_length;
1500
    mysql_log.write(thd,command,"%s",thd->query);
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    DBUG_PRINT("query",("%-.4096s",thd->query));
1502
    mysql_parse(thd,thd->query, thd->query_length);
1503

1504
    while (!thd->killed && !thd->is_fatal_error && thd->lex->found_colon)
1505
    {
1506
      char *packet= thd->lex->found_colon;
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      /*
1508
        Multiple queries exits, execute them individually
1509
	in embedded server - just store them to be executed later 
1510
      */
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#ifndef EMBEDDED_LIBRARY
1512
      if (thd->lock || thd->open_tables || thd->derived_tables)
1513
        close_thread_tables(thd);
1514
#endif
1515
      ulong length= (ulong)(packet_end-packet);
1516

1517
      log_slow_statement(thd);
1518

1519
      /* Remove garbage at start of query */
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      while (my_isspace(thd->charset(), *packet) && length > 0)
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      {
        packet++;
        length--;
      }
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      VOID(pthread_mutex_lock(&LOCK_thread_count));
1526
      thd->query_length= length;
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      thd->query= packet;
      thd->query_id= query_id++;
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      thd->set_time(); /* Reset the query start time. */
1530
      /* TODO: set thd->lex->sql_command to SQLCOM_END here */
1531
      VOID(pthread_mutex_unlock(&LOCK_thread_count));
1532
#ifndef EMBEDDED_LIBRARY
1533
      mysql_parse(thd, packet, length);
1534
#else
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      /*
	'packet' can point inside the query_rest's buffer
	so we have to do memmove here
       */
      if (thd->query_rest.length() > length)
      {
	memmove(thd->query_rest.c_ptr(), packet, length);
	thd->query_rest.length(length);
      }
      else
1545
	thd->query_rest.copy(packet, length, thd->query_rest.charset());
1546 1547 1548

      thd->server_status&= ~ (SERVER_QUERY_NO_INDEX_USED |
                              SERVER_QUERY_NO_GOOD_INDEX_USED);
1549 1550
      break;
#endif /*EMBEDDED_LIBRARY*/
1551 1552
    }

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    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),WAIT_PRIOR);
    DBUG_PRINT("info",("query ready"));
    break;
  }
1558
  case COM_FIELD_LIST:				// This isn't actually needed
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#ifdef DONT_ALLOW_SHOW_COMMANDS
1560
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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    break;
#else
  {
1564
    char *fields, *pend;
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    TABLE_LIST table_list;
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    LEX_STRING conv_name;

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    statistic_increment(com_stat[SQLCOM_SHOW_FIELDS],&LOCK_status);
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    bzero((char*) &table_list,sizeof(table_list));
    if (!(table_list.db=thd->db))
    {
1572
      send_error(thd,ER_NO_DB_ERROR);
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      break;
    }
    thd->free_list=0;
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    pend= strend(packet);
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    thd->convert_string(&conv_name, system_charset_info,
			packet, (uint) (pend-packet), thd->charset());
    table_list.alias= table_list.real_name= conv_name.str;
1580
    packet= pend+1;
1581
    thd->query_length= strlen(packet);       // for simplicity: don't optimize
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    if (!(thd->query=fields=thd->memdup(packet,thd->query_length+1)))
      break;
1584
    mysql_log.write(thd,command,"%s %s",table_list.real_name,fields);
1585
    if (lower_case_table_names)
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      my_casedn_str(files_charset_info, table_list.real_name);
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    remove_escape(table_list.real_name);	// This can't have wildcards

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    if (check_access(thd,SELECT_ACL,table_list.db,&table_list.grant.privilege,
		     0, 0))
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      break;
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    if (grant_option &&
	check_grant(thd, SELECT_ACL, &table_list, 2, UINT_MAX, 0))
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      break;
    mysqld_list_fields(thd,&table_list,fields);
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    free_items(thd->free_list);
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    thd->free_list= 0;
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    break;
  }
#endif
  case COM_QUIT:
1602
    /* We don't calculate statistics for this command */
1603
    mysql_log.write(thd,command,NullS);
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    net->error=0;				// Don't give 'abort' message
    error=TRUE;					// End server
    break;

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  case COM_CREATE_DB:				// QQ: To be removed
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    {
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      char *db=thd->strdup(packet), *alias;
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      HA_CREATE_INFO create_info;
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      statistic_increment(com_stat[SQLCOM_CREATE_DB],&LOCK_status);
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      // null test to handle EOM
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      if (!db || !(alias= thd->strdup(db)) || check_db_name(db))
1616
      {
1617
	net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
1618 1619
	break;
      }
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      if (check_access(thd,CREATE_ACL,db,0,1,0))
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	break;
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      mysql_log.write(thd,command,packet);
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      bzero(&create_info, sizeof(create_info));
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      if (mysql_create_db(thd, (lower_case_table_names == 2 ? alias : db),
1625
                          &create_info, 0) < 0)
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        send_error(thd, thd->killed ? ER_SERVER_SHUTDOWN : 0);
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      break;
    }
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  case COM_DROP_DB:				// QQ: To be removed
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    {
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      statistic_increment(com_stat[SQLCOM_DROP_DB],&LOCK_status);
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      char *db=thd->strdup(packet), *alias;
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      // null test to handle EOM
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      if (!db || !(alias= thd->strdup(db)) || check_db_name(db))
1635
      {
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	net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
1637 1638
	break;
      }
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      if (check_access(thd,DROP_ACL,db,0,1,0))
1640
	break;
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      if (thd->locked_tables || thd->active_transaction())
      {
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	send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
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	break;
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      }
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      mysql_log.write(thd,command,db);
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      if (mysql_rm_db(thd, (lower_case_table_names == 2 ? alias : db),
                      0, 0) < 0)
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        send_error(thd, thd->killed ? ER_SERVER_SHUTDOWN : 0);
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      break;
    }
1652
#ifndef EMBEDDED_LIBRARY
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  case COM_BINLOG_DUMP:
    {
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      ulong pos;
      ushort flags;
      uint32 slave_server_id;

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      statistic_increment(com_other,&LOCK_status);
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      thd->enable_slow_log= opt_log_slow_admin_statements;
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      if (check_global_access(thd, REPL_SLAVE_ACL))
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	break;
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1664
      /* TODO: The following has to be changed to an 8 byte integer */
1665 1666
      pos = uint4korr(packet);
      flags = uint2korr(packet + 4);
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      thd->server_id=0; /* avoid suicide */
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      if ((slave_server_id= uint4korr(packet+6))) // mysqlbinlog.server_id==0
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	kill_zombie_dump_threads(slave_server_id);
1670
      thd->server_id = slave_server_id;
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      mysql_log.write(thd, command, "Log: '%s'  Pos: %ld", packet+10,
                      (long) pos);
1674
      mysql_binlog_send(thd, thd->strdup(packet + 10), (my_off_t) pos, flags);
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      unregister_slave(thd,1,1);
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      // fake COM_QUIT -- if we get here, the thread needs to terminate
      error = TRUE;
      net->error = 0;
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      break;
    }
1681
#endif
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  case COM_REFRESH:
    {
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      statistic_increment(com_stat[SQLCOM_FLUSH],&LOCK_status);
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      ulong options= (ulong) (uchar) packet[0];
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      if (check_global_access(thd,RELOAD_ACL))
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	break;
1688
      mysql_log.write(thd,command,NullS);
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      if (reload_acl_and_cache(thd, options, (TABLE_LIST*) 0, NULL))
        send_error(thd, 0);
      else
        send_ok(thd);
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      break;
    }
1695
#ifndef EMBEDDED_LIBRARY
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  case COM_SHUTDOWN:
1697
  {
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    statistic_increment(com_other,&LOCK_status);
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    if (check_global_access(thd,SHUTDOWN_ACL))
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      break; /* purecov: inspected */
1701
    /*
1702 1703 1704 1705
      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].
1706
    */
1707 1708
    enum mysql_enum_shutdown_level level=
      (enum mysql_enum_shutdown_level) (uchar) packet[0];
1709
    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");
      send_error(thd);
      break;
    }
1718
    DBUG_PRINT("quit",("Got shutdown command for level %u", level));
1719
    mysql_log.write(thd,command,NullS);
1720
    send_eof(thd);
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#ifdef __WIN__
    sleep(1);					// must wait after eof()
#endif
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#ifndef OS2
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    send_eof(thd);				// This is for 'quit request'
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#endif
1727
    close_connection(thd, 0, 1);
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    close_thread_tables(thd);			// Free before kill
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    free_root(thd->mem_root,MYF(0));
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    free_root(&thd->transaction.mem_root,MYF(0));
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    kill_mysql();
    error=TRUE;
    break;
1734
  }
1735
#endif
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  case COM_STATISTICS:
  {
1738
    mysql_log.write(thd,command,NullS);
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    statistic_increment(com_stat[SQLCOM_SHOW_STATUS],&LOCK_status);
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#ifndef EMBEDDED_LIBRARY
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    char buff[200];
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#else
    char *buff= thd->net.last_error;
#endif
1745
    ulong uptime = (ulong) (thd->start_time - start_time);
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    sprintf((char*) buff,
1747
	    "Uptime: %ld  Threads: %d  Questions: %lu  Slow queries: %ld  Opens: %ld  Flush tables: %ld  Open tables: %u  Queries per second avg: %.3f",
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	    uptime,
	    (int) thread_count,thd->query_id,long_query_count,
	    opened_tables,refresh_version, cached_tables(),
	    uptime ? (float)thd->query_id/(float)uptime : 0);
#ifdef SAFEMALLOC
1753
    if (sf_malloc_cur_memory)				// Using SAFEMALLOC
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      sprintf(strend(buff), "  Memory in use: %ldK  Max memory used: %ldK",
1755 1756
	      (sf_malloc_cur_memory+1023L)/1024L,
	      (sf_malloc_max_memory+1023L)/1024L);
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#endif
#ifndef EMBEDDED_LIBRARY
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    VOID(my_net_write(net, buff,(uint) strlen(buff)));
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    VOID(net_flush(net));
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#endif
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    break;
  }
  case COM_PING:
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    statistic_increment(com_other,&LOCK_status);
1766
    send_ok(thd);				// Tell client we are alive
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    break;
  case COM_PROCESS_INFO:
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    statistic_increment(com_stat[SQLCOM_SHOW_PROCESSLIST],&LOCK_status);
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    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
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      break;
1772
    mysql_log.write(thd,command,NullS);
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    mysqld_list_processes(thd,
			  thd->master_access & PROCESS_ACL ? 
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			  NullS : thd->priv_user, 0);
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    break;
  case COM_PROCESS_KILL:
  {
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    statistic_increment(com_stat[SQLCOM_KILL],&LOCK_status);
1780
    ulong id=(ulong) uint4korr(packet);
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    kill_one_thread(thd,id);
    break;
  }
1784 1785 1786 1787 1788 1789 1790
  case COM_SET_OPTION:
  {
    statistic_increment(com_stat[SQLCOM_SET_OPTION], &LOCK_status);
    enum_mysql_set_option command= (enum_mysql_set_option) uint2korr(packet);
    switch (command) {
    case MYSQL_OPTION_MULTI_STATEMENTS_ON:
      thd->client_capabilities|= CLIENT_MULTI_STATEMENTS;
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      send_eof(thd);
1792 1793 1794
      break;
    case MYSQL_OPTION_MULTI_STATEMENTS_OFF:
      thd->client_capabilities&= ~CLIENT_MULTI_STATEMENTS;
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      send_eof(thd);
1796 1797 1798 1799 1800 1801 1802
      break;
    default:
      send_error(thd, ER_UNKNOWN_COM_ERROR);
      break;
    }
    break;
  }
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1803
  case COM_DEBUG:
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    statistic_increment(com_other,&LOCK_status);
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1805
    if (check_global_access(thd, SUPER_ACL))
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      break;					/* purecov: inspected */
    mysql_print_status(thd);
1808
    mysql_log.write(thd,command,NullS);
1809
    send_eof(thd);
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    break;
  case COM_SLEEP:
  case COM_CONNECT:				// Impossible here
  case COM_TIME:				// Impossible from client
  case COM_DELAYED_INSERT:
1815
  case COM_END:
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1816
  default:
1817
    send_error(thd, ER_UNKNOWN_COM_ERROR);
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    break;
  }
1820
  if (thd->lock || thd->open_tables || thd->derived_tables)
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  {
    thd->proc_info="closing tables";
    close_thread_tables(thd);			/* Free tables */
  }

1826
  if (thd->is_fatal_error)
1827
    send_error(thd,0);				// End of memory ?
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1828

1829
  log_slow_statement(thd);
1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844

  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);
}


1845
void log_slow_statement(THD *thd)
1846
{
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  time_t start_of_query=thd->start_time;
1848
  thd->end_time();				// Set start time
1849

1850 1851 1852 1853 1854
  /*
    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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1855
  {
1856 1857
    thd->proc_info="logging slow query";

1858 1859
    if ((ulong) (thd->start_time - thd->time_after_lock) >
	thd->variables.long_query_time ||
1860 1861
	((thd->server_status &
	  (SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED)) &&
1862
	 (specialflag & SPECIAL_LOG_QUERIES_NOT_USING_INDEXES)))
1863 1864 1865 1866
    {
      long_query_count++;
      mysql_slow_log.write(thd, thd->query, thd->query_length, start_of_query);
    }
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  }
}

1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887

/*
  Read query from packet and store in thd->query
  Used in COM_QUERY and COM_PREPARE

  DESCRIPTION
    Sets the following THD variables:
      query
      query_length

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

bool alloc_query(THD *thd, char *packet, ulong packet_length)
{
  packet_length--;				// Remove end null
1888
  /* Remove garbage at start and end of query */
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  while (my_isspace(thd->charset(),packet[0]) && packet_length > 0)
1890 1891 1892 1893 1894
  {
    packet++;
    packet_length--;
  }
  char *pos=packet+packet_length;		// Point at end null
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  while (packet_length > 0 &&
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	 (pos[-1] == ';' || my_isspace(thd->charset() ,pos[-1])))
1897 1898 1899 1900 1901
  {
    pos--;
    packet_length--;
  }
  /* We must allocate some extra memory for query cache */
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  thd->query_length= 0;                        // Extra safety: Avoid races
1903 1904
  if (!(thd->query= (char*) thd->memdup_w_gap((gptr) (packet),
					      packet_length,
1905 1906
					      thd->db_length+ 1 +
					      QUERY_CACHE_FLAGS_SIZE)))
1907 1908 1909
    return 1;
  thd->query[packet_length]=0;
  thd->query_length= packet_length;
1910 1911 1912 1913

  /* Reclaim some memory */
  thd->packet.shrink(thd->variables.net_buffer_length);
  thd->convert_buffer.shrink(thd->variables.net_buffer_length);
1914 1915 1916 1917 1918 1919

  if (!(specialflag & SPECIAL_NO_PRIOR))
    my_pthread_setprio(pthread_self(),QUERY_PRIOR);
  return 0;
}

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

void
1926
mysql_execute_command(THD *thd)
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{
1928
  int	res= 0;
1929
  LEX	*lex= thd->lex;
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  bool slave_fake_lock= 0;
  MYSQL_LOCK *fake_prev_lock= 0;
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  SELECT_LEX *select_lex= &lex->select_lex;
1933
  TABLE_LIST *tables= (TABLE_LIST*) select_lex->table_list.first;
1934
  SELECT_LEX_UNIT *unit= &lex->unit;
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  DBUG_ENTER("mysql_execute_command");

1937 1938 1939 1940 1941 1942
  /*
    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.
  */
1943 1944
  if (tables || &lex->select_lex != lex->all_selects_list ||
      lex->time_zone_tables_used)
1945 1946
    mysql_reset_errors(thd);

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  /*
    When subselects or time_zone info is used in a query
    we create a new TABLE_LIST containing all referenced tables
    and set local variable 'tables' to point to this list.
1951
  */
1952 1953 1954 1955 1956
  if ((&lex->select_lex != lex->all_selects_list ||
       lex->time_zone_tables_used) &&
      lex->unit.create_total_list(thd, lex, &tables))
    DBUG_VOID_RETURN;

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#ifdef HAVE_REPLICATION
1958 1959
  if (thd->slave_thread)
  {
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    if (lex->sql_command == SQLCOM_UPDATE_MULTI)
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    {
      DBUG_PRINT("info",("need faked locked tables"));
      
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      if (check_multi_update_lock(thd, tables, &select_lex->item_list,
				  select_lex))
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        goto error;

      /* Fix for replication, the tables are opened and locked,
         now we pretend that we have performed a LOCK TABLES action */
	 
      fake_prev_lock= thd->locked_tables;
      if (thd->lock)
        thd->locked_tables= thd->lock;
      thd->lock= 0;
      slave_fake_lock= 1;
    }
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    /*
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merge  
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      Skip if we are in the slave thread, some table rules have been
1979 1980 1981 1982
      given and the table list says the query should not be replicated.
      Exception is DROP TEMPORARY TABLE IF EXISTS: we always execute it
      (otherwise we have stale files on slave caused by exclusion of one tmp
      table).
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    */
1984 1985 1986
    if (!(lex->sql_command == SQLCOM_DROP_TABLE &&
          lex->drop_temporary && lex->drop_if_exists) &&
        all_tables_not_ok(thd,tables))
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    {
      /* we warn the slave SQL thread */
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
1990
      DBUG_VOID_RETURN;
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1991
    }
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1992 1993
#ifndef TO_BE_DELETED
    /*
1994 1995 1996
      This is a workaround to deal with the shortcoming in 3.23.44-3.23.46
      masters in RELEASE_LOCK() logging. We re-write SELECT RELEASE_LOCK()
      as DO RELEASE_LOCK()
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1997
    */
1998 1999 2000
    if (lex->sql_command == SQLCOM_SELECT)
    {
      lex->sql_command = SQLCOM_DO;
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2001
      lex->insert_list = &select_lex->item_list;
2002
    }
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2003
#endif
2004
  }
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2005
#endif /* !HAVE_REPLICATION */
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2007 2008 2009 2010 2011
  /*
    When option readonly is set deny operations which change tables.
    Except for the replication thread and the 'super' users.
  */
  if (opt_readonly &&
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2012
      !(thd->slave_thread || (thd->master_access & SUPER_ACL)) &&
2013 2014
      (uc_update_queries[lex->sql_command] > 0))
  {
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2015
    net_printf(thd, ER_OPTION_PREVENTS_STATEMENT, "--read-only");
2016 2017
    DBUG_VOID_RETURN;
  }
2018

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2019
  statistic_increment(com_stat[lex->sql_command],&LOCK_status);
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2020 2021 2022
  switch (lex->sql_command) {
  case SQLCOM_SELECT:
  {
2023 2024 2025 2026 2027 2028 2029
    /* assign global limit variable if limit is not given */
    {
      SELECT_LEX *param= lex->unit.global_parameters;
      if (!param->explicit_limit)
	param->select_limit= thd->variables.select_limit;
    }

2030
    select_result *result=lex->result;
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2031 2032 2033 2034 2035
    if (tables)
    {
      res=check_table_access(thd,
			     lex->exchange ? SELECT_ACL | FILE_ACL :
			     SELECT_ACL,
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			     tables,0);
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2037 2038 2039
    }
    else
      res=check_access(thd, lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL,
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2040
		       any_db,0,0,0);
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2041 2042 2043 2044 2045
    if (res)
    {
      res=0;
      break;					// Error message is given
    }
2046 2047 2048 2049
    /* 
       In case of single SELECT unit->global_parameters points on first SELECT
       TODO: move counters to SELECT_LEX
    */
2050 2051 2052
    unit->offset_limit_cnt= (ha_rows) unit->global_parameters->offset_limit;
    unit->select_limit_cnt= (ha_rows) (unit->global_parameters->select_limit+
      unit->global_parameters->offset_limit);
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2053
    if (unit->select_limit_cnt <
2054
	(ha_rows) unit->global_parameters->select_limit)
2055
      unit->select_limit_cnt= HA_POS_ERROR;		// no limit
2056
    if (unit->select_limit_cnt == HA_POS_ERROR && !select_lex->next_select())
2057
      select_lex->options&= ~OPTION_FOUND_ROWS;
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2058 2059

    if (!(res=open_and_lock_tables(thd,tables)))
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2060
    {
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2061
      if (lex->describe)
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2062
      {
2063 2064 2065 2066 2067 2068 2069
	if (!(result= new select_send()))
	{
	  send_error(thd, ER_OUT_OF_RESOURCES);
	  DBUG_VOID_RETURN;
	}
	else
	  thd->send_explain_fields(result);
2070
	res= mysql_explain_union(thd, &thd->lex->unit, result);
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2071 2072 2073 2074 2075
	if (lex->describe & DESCRIBE_EXTENDED)
	{
	  char buff[1024];
	  String str(buff,(uint32) sizeof(buff), system_charset_info);
	  str.length(0);
2076
	  thd->lex->unit.print(&str);
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2077 2078 2079 2080
	  str.append('\0');
	  push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
		       ER_YES, str.ptr());
	}
2081
	result->send_eof();
2082
        delete result;
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2083 2084 2085
      }
      else
      {
2086
	if (!result && !(result= new select_send()))
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2087
	{
2088 2089
	  res= -1;
	  break;
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2090
	}
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2091
	query_cache_store_query(thd, tables);
2092 2093 2094
	res= handle_select(thd, lex, result);
        if (result != lex->result)
          delete result;
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2095
      }
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    }
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    break;
  }
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2099
  case SQLCOM_PREPARE:
2100
  {
2101 2102 2103 2104
    char *query_str;
    uint query_len;
    if (lex->prepared_stmt_code_is_varref)
    {
2105
      /* This is PREPARE stmt FROM @var. */
2106 2107 2108 2109
      String str;
      CHARSET_INFO *to_cs= thd->variables.collation_connection;
      bool need_conversion;
      user_var_entry *entry;
2110
      String *pstr= &str;
2111
      uint32 unused;
2112
      /*
2113 2114 2115
        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.
2116
      */
2117 2118
      if ((entry=
             (user_var_entry*)hash_search(&thd->user_vars,
2119 2120 2121 2122
                                          (byte*)lex->prepared_stmt_code.str,
                                          lex->prepared_stmt_code.length))
          && entry->value)
      {
2123 2124
        my_bool is_var_null;
        pstr= entry->val_str(&is_var_null, &str, NOT_FIXED_DEC);
2125 2126 2127 2128
        /*
          NULL value of variable checked early as entry->value so here
          we can't get NULL in normal conditions
        */
2129 2130
        DBUG_ASSERT(!is_var_null);
        if (!pstr)
2131 2132 2133 2134
        {
          res= -1;
          break;      // EOM (error should be reported by allocator)
        }
2135 2136
      }
      else
2137 2138 2139 2140 2141
      {
        /*
          variable absent or equal to NULL, so we need to set variable to
          something reasonable to get readable error message during parsing
        */
2142
        str.set("NULL", 4, &my_charset_latin1);
2143 2144
      }

2145
      need_conversion=
2146 2147
        String::needs_conversion(pstr->length(), pstr->charset(),
                                 to_cs, &unused);
2148

2149 2150
      query_len= need_conversion? (pstr->length() * to_cs->mbmaxlen) :
                                  pstr->length();
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2151
      if (!(query_str= alloc_root(thd->mem_root, query_len+1)))
2152 2153 2154 2155
      {
        res= -1;
        break;        // EOM (error should be reported by allocator)
      }
2156

2157
      if (need_conversion)
2158 2159 2160 2161 2162 2163
      {
        uint dummy_errors;
        query_len= copy_and_convert(query_str, query_len, to_cs,
                                    pstr->ptr(), pstr->length(),
                                    pstr->charset(), &dummy_errors);
      }
2164
      else
2165
        memcpy(query_str, pstr->ptr(), pstr->length());
2166
      query_str[query_len]= 0;
2167 2168 2169
    }
    else
    {
2170 2171
      query_str= lex->prepared_stmt_code.str;
      query_len= lex->prepared_stmt_code.length;
2172
      DBUG_PRINT("info", ("PREPARE: %.*s FROM '%.*s' \n",
2173 2174
                          lex->prepared_stmt_name.length,
                          lex->prepared_stmt_name.str,
2175
                          query_len, query_str));
2176
    }
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2177
    thd->command= COM_PREPARE;
2178 2179
    if (!mysql_stmt_prepare(thd, query_str, query_len + 1,
                            &lex->prepared_stmt_name))
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2180 2181 2182 2183 2184
      send_ok(thd, 0L, 0L, "Statement prepared");
    break;
  }
  case SQLCOM_EXECUTE:
  {
2185
    DBUG_PRINT("info", ("EXECUTE: %.*s\n",
2186 2187 2188
                        lex->prepared_stmt_name.length,
                        lex->prepared_stmt_name.str));
    mysql_sql_stmt_execute(thd, &lex->prepared_stmt_name);
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2189 2190 2191 2192 2193
    lex->prepared_stmt_params.empty();
    break;
  }
  case SQLCOM_DEALLOCATE_PREPARE:
  {
2194 2195 2196 2197
    Statement* stmt;
    DBUG_PRINT("info", ("DEALLOCATE PREPARE: %.*s\n", 
                        lex->prepared_stmt_name.length,
                        lex->prepared_stmt_name.str));
2198 2199
    /* We account deallocate in the same manner as mysql_stmt_close */
    statistic_increment(com_stmt_close, &LOCK_status);
2200
    if ((stmt= thd->stmt_map.find_by_name(&lex->prepared_stmt_name)))
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2201
    {
2202 2203
      thd->stmt_map.erase(stmt);
      send_ok(thd);
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2204
    }
2205
    else
2206 2207 2208 2209 2210 2211
    {
      res= -1;
      my_error(ER_UNKNOWN_STMT_HANDLER, MYF(0),
               lex->prepared_stmt_name.length, lex->prepared_stmt_name.str,
               "DEALLOCATE PREPARE");
    }
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2212 2213
    break;
  }
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2214
  case SQLCOM_DO:
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2215
    if (tables && ((res= check_table_access(thd, SELECT_ACL, tables,0)) ||
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2216 2217 2218 2219 2220 2221
		   (res= open_and_lock_tables(thd,tables))))
	break;

    res= mysql_do(thd, *lex->insert_list);
    if (thd->net.report_error)
      res= -1;
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2222 2223
    break;

2224
  case SQLCOM_EMPTY_QUERY:
2225
    send_ok(thd);
2226 2227
    break;

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2228 2229 2230 2231
  case SQLCOM_HELP:
    res= mysqld_help(thd,lex->help_arg);
    break;

2232
#ifndef EMBEDDED_LIBRARY
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2233
  case SQLCOM_PURGE:
2234
  {
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2235
    if (check_global_access(thd, SUPER_ACL))
2236
      goto error;
2237
    // PURGE MASTER LOGS TO 'file'
2238 2239 2240
    res = purge_master_logs(thd, lex->to_log);
    break;
  }
2241 2242 2243 2244 2245 2246 2247 2248
  case SQLCOM_PURGE_BEFORE:
  {
    if (check_global_access(thd, SUPER_ACL))
      goto error;
    // PURGE MASTER LOGS BEFORE 'data'
    res = purge_master_logs_before_date(thd, lex->purge_time);
    break;
  }
2249
#endif
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2250 2251
  case SQLCOM_SHOW_WARNS:
  {
2252 2253
    res= mysqld_show_warnings(thd, (ulong)
			      ((1L << (uint) MYSQL_ERROR::WARN_LEVEL_NOTE) |
2254 2255 2256
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_WARN) |
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR)
			       ));
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2257 2258 2259 2260
    break;
  }
  case SQLCOM_SHOW_ERRORS:
  {
2261 2262
    res= mysqld_show_warnings(thd, (ulong)
			      (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR));
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2263 2264
    break;
  }
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2265 2266
  case SQLCOM_SHOW_NEW_MASTER:
  {
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2267
    if (check_global_access(thd, REPL_SLAVE_ACL))
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2268
      goto error;
2269
    /* This query don't work now. See comment in repl_failsafe.cc */
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2270
#ifndef WORKING_NEW_MASTER
2271
    net_printf(thd, ER_NOT_SUPPORTED_YET, "SHOW NEW MASTER");
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2272 2273
    res= 1;
#else
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2274
    res = show_new_master(thd);
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2275
#endif
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2276 2277
    break;
  }
2278

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2279
#ifdef HAVE_REPLICATION
2280 2281
  case SQLCOM_SHOW_SLAVE_HOSTS:
  {
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2282
    if (check_global_access(thd, REPL_SLAVE_ACL))
2283 2284 2285 2286
      goto error;
    res = show_slave_hosts(thd);
    break;
  }
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2287 2288
  case SQLCOM_SHOW_BINLOG_EVENTS:
  {
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2289
    if (check_global_access(thd, REPL_SLAVE_ACL))
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2290 2291 2292 2293
      goto error;
    res = show_binlog_events(thd);
    break;
  }
2294 2295
#endif

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2296
  case SQLCOM_BACKUP_TABLE:
2297 2298
  {
    if (check_db_used(thd,tables) ||
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2299
	check_table_access(thd,SELECT_ACL, tables,0) ||
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2300
	check_global_access(thd, FILE_ACL))
2301
      goto error; /* purecov: inspected */
2302
    thd->enable_slow_log= opt_log_slow_admin_statements;
2303
    res = mysql_backup_table(thd, tables);
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2304

2305 2306
    break;
  }
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2307
  case SQLCOM_RESTORE_TABLE:
2308 2309
  {
    if (check_db_used(thd,tables) ||
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2310
	check_table_access(thd, INSERT_ACL, tables,0) ||
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2311
	check_global_access(thd, FILE_ACL))
2312
      goto error; /* purecov: inspected */
2313
    thd->enable_slow_log= opt_log_slow_admin_statements;
2314 2315 2316
    res = mysql_restore_table(thd, tables);
    break;
  }
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2317 2318 2319
  case SQLCOM_ASSIGN_TO_KEYCACHE:
  {
    if (check_db_used(thd, tables) ||
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2320 2321
        check_access(thd, INDEX_ACL, tables->db,
                     &tables->grant.privilege, 0, 0))
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2322
      goto error;
2323
    res= mysql_assign_to_keycache(thd, tables, &lex->name_and_length);
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2324 2325
    break;
  }
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2326 2327 2328
  case SQLCOM_PRELOAD_KEYS:
  {
    if (check_db_used(thd, tables) ||
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2329 2330
	check_access(thd, INDEX_ACL, tables->db,
                     &tables->grant.privilege, 0, 0))
2331
      goto error;
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2332 2333 2334
    res = mysql_preload_keys(thd, tables);
    break;
  }
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2335
#ifdef HAVE_REPLICATION
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2336
  case SQLCOM_CHANGE_MASTER:
2337
  {
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2338
    if (check_global_access(thd, SUPER_ACL))
2339
      goto error;
2340
    pthread_mutex_lock(&LOCK_active_mi);
2341
    res = change_master(thd,active_mi);
2342
    pthread_mutex_unlock(&LOCK_active_mi);
2343 2344
    break;
  }
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2345
  case SQLCOM_SHOW_SLAVE_STAT:
2346
  {
2347 2348
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2349
      goto error;
2350
    pthread_mutex_lock(&LOCK_active_mi);
2351
    res = show_master_info(thd,active_mi);
2352
    pthread_mutex_unlock(&LOCK_active_mi);
2353 2354
    break;
  }
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2355
  case SQLCOM_SHOW_MASTER_STAT:
2356
  {
2357 2358
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2359 2360 2361 2362
      goto error;
    res = show_binlog_info(thd);
    break;
  }
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2363

2364
  case SQLCOM_LOAD_MASTER_DATA: // sync with master
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2365
    if (check_global_access(thd, SUPER_ACL))
2366
      goto error;
2367 2368 2369 2370
    if (end_active_trans(thd))
      res= -1;
    else
      res = load_master_data(thd);
2371
    break;
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2372
#endif /* HAVE_REPLICATION */
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2373 2374 2375
#ifdef HAVE_INNOBASE_DB
  case SQLCOM_SHOW_INNODB_STATUS:
    {
2376
      if (check_global_access(thd, SUPER_ACL))
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2377 2378 2379 2380 2381
	goto error;
      res = innodb_show_status(thd);
      break;
    }
#endif
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2382
#ifdef HAVE_REPLICATION
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2383
  case SQLCOM_LOAD_MASTER_TABLE:
2384
  {
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2385 2386
    if (!tables->db)
      tables->db=thd->db;
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2387
    if (check_access(thd,CREATE_ACL,tables->db,&tables->grant.privilege,0,0))
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2388 2389 2390 2391
      goto error;				/* purecov: inspected */
    if (grant_option)
    {
      /* Check that the first table has CREATE privilege */
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2392
      if (check_grant(thd, CREATE_ACL, tables, 0, 1, 0))
2393
	goto error;
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2394
    }
2395
    if (strlen(tables->real_name) > NAME_LEN)
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2396
    {
2397
      net_printf(thd,ER_WRONG_TABLE_NAME, tables->real_name);
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2398 2399
      break;
    }
2400
    pthread_mutex_lock(&LOCK_active_mi);
2401 2402 2403 2404
    /*
      fetch_master_table will send the error to the client on failure.
      Give error if the table already exists.
    */
2405
    if (!fetch_master_table(thd, tables->db, tables->real_name,
2406
			    active_mi, 0, 0))
2407
    {
2408
      send_ok(thd);
2409
    }
2410
    pthread_mutex_unlock(&LOCK_active_mi);
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2411
    break;
2412
  }
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2413
#endif /* HAVE_REPLICATION */
2414

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2415
  case SQLCOM_CREATE_TABLE:
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2416
  {
2417
    /* If CREATE TABLE of non-temporary table, do implicit commit */
2418 2419 2420 2421 2422 2423 2424 2425 2426 2427
    if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE))
    {
      if (end_active_trans(thd))
      {
	res= -1;
	break;
      }
    }
    else 
    {
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2428 2429
      /* So that CREATE TEMPORARY TABLE gets to binlog at commit/rollback */
      thd->options|= OPTION_STATUS_NO_TRANS_UPDATE;
2430
    }
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2431
    /* Skip first table, which is the table we are creating */
2432 2433 2434
    TABLE_LIST *create_table, *create_table_local;
    tables= lex->unlink_first_table(tables, &create_table,
				    &create_table_local);
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2435

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2436 2437 2438
    if ((res= create_table_precheck(thd, tables, create_table)))
      goto unsent_create_error;

2439 2440 2441
#ifndef HAVE_READLINK
    lex->create_info.data_file_name=lex->create_info.index_file_name=0;
#else
2442
    /* Fix names if symlinked tables */
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2443
    if (append_file_to_dir(thd, &lex->create_info.data_file_name,
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2444
			   create_table->real_name) ||
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2445
	append_file_to_dir(thd,&lex->create_info.index_file_name,
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2446
			   create_table->real_name))
2447 2448
    {
      res=-1;
2449
      goto unsent_create_error;
2450
    }
2451
#endif
2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464
    /*
      If we are using SET CHARSET without DEFAULT, add an implicite
      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;
    }
2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480
    /*
      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))
    {
      res= -1;
2481
      goto unsent_create_error;
2482
    }
2483
    if (select_lex->item_list.elements)		// With select
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2484 2485 2486
    {
      select_result *result;

2487
      select_lex->options|= SELECT_NO_UNLOCK;
2488 2489 2490 2491
      unit->offset_limit_cnt= select_lex->offset_limit;
      unit->select_limit_cnt= select_lex->select_limit+
	select_lex->offset_limit;
      if (unit->select_limit_cnt < select_lex->select_limit)
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2492
	unit->select_limit_cnt= HA_POS_ERROR;	// No limit
2493

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2494
      if (!(res=open_and_lock_tables(thd,tables)))
2495
      {
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	res= -1;				// If error
        if ((result=new select_create(create_table->db,
                                      create_table->real_name,
				      &lex->create_info,
2500 2501
                                      lex->create_list,
                                      lex->key_list,
2502 2503
                                      select_lex->item_list, lex->duplicates,
                                      lex->ignore)))
2504 2505 2506 2507 2508 2509
        {
          /*
            CREATE from SELECT give its SELECT_LEX for SELECT,
            and item_list belong to SELECT
          */
          select_lex->resolve_mode= SELECT_LEX::SELECT_MODE;
2510
          res=handle_select(thd, lex, result);
2511 2512
          select_lex->resolve_mode= SELECT_LEX::NOMATTER_MODE;
        }
2513 2514 2515
	//reset for PS
	lex->create_list.empty();
	lex->key_list.empty();
2516 2517
      }
    }
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    else // regular create
    {
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      if (lex->name)
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        res= mysql_create_like_table(thd, create_table, &lex->create_info, 
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2522 2523
                                     (Table_ident *)lex->name); 
      else
2524
      {
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        res= mysql_create_table(thd,create_table->db,
			         create_table->real_name, &lex->create_info,
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			         lex->create_list,
2528
			         lex->key_list,0,0);
2529
      }
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      if (!res)
2531
	send_ok(thd);
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    }
2533 2534 2535 2536 2537
    /*
      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);
2538

2539 2540
unsent_create_error:
    // put tables back for PS rexecuting
2541 2542
    tables= lex->link_first_table_back(tables, create_table,
				       create_table_local);
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    break;
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2544
  }
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  case SQLCOM_CREATE_INDEX:
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    if (check_one_table_access(thd, INDEX_ACL, tables))
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      goto error; /* purecov: inspected */
2548
    thd->enable_slow_log= opt_log_slow_admin_statements;
2549 2550 2551 2552
    if (end_active_trans(thd))
      res= -1;
    else
      res = mysql_create_index(thd, tables, lex->key_list);
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    break;

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#ifdef HAVE_REPLICATION
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  case SQLCOM_SLAVE_START:
2557
  {
2558
    pthread_mutex_lock(&LOCK_active_mi);
2559
    start_slave(thd,active_mi,1 /* net report*/);
2560
    pthread_mutex_unlock(&LOCK_active_mi);
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    break;
2562
  }
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  case SQLCOM_SLAVE_STOP:
2564 2565 2566 2567 2568 2569
  /*
    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,
2570
      so it waits for the client thread because t is locked by it.
2571
    - then the client thread does SLAVE STOP.
2572 2573
      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.
2574 2575 2576 2577 2578
    To prevent that, refuse SLAVE STOP if the
    client thread has locked tables
  */
  if (thd->locked_tables || thd->active_transaction())
  {
2579
    send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
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    break;
2581
  }
2582
  {
2583
    pthread_mutex_lock(&LOCK_active_mi);
2584
    stop_slave(thd,active_mi,1/* net report*/);
2585
    pthread_mutex_unlock(&LOCK_active_mi);
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    break;
2587
  }
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#endif /* HAVE_REPLICATION */
2589

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  case SQLCOM_ALTER_TABLE:
#if defined(DONT_ALLOW_SHOW_COMMANDS)
2592
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
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    break;
#else
    {
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      ulong priv=0;
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      if (lex->name && (!lex->name[0] || strlen(lex->name) > NAME_LEN))
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      {
2599
	net_printf(thd, ER_WRONG_TABLE_NAME, lex->name);
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	res= 1;
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	break;
      }
2603
      if (!select_lex->db)
2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621
      {
        /*
          In the case of ALTER TABLE ... RENAME we should supply the
          default database if the new name is not explicitly qualified
          by a database. (Bug #11493)
        */
        if (lex->alter_info.flags & ALTER_RENAME)
        {
          if (! thd->db)
          {
            send_error(thd,ER_NO_DB_ERROR);
            goto error;
          }
          select_lex->db= thd->db;
        }
        else
          select_lex->db=tables->db;
      }
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      if (check_access(thd,ALTER_ACL,tables->db,&tables->grant.privilege,0,0) ||
	  check_access(thd,INSERT_ACL | CREATE_ACL,select_lex->db,&priv,0,0)||
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	  check_merge_table_access(thd, tables->db,
2625 2626 2627
				   (TABLE_LIST *)
				   lex->create_info.merge_list.first))
	goto error;				/* purecov: inspected */
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      if (grant_option)
      {
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	if (check_grant(thd, ALTER_ACL, tables, 0, UINT_MAX, 0))
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	  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));
	  tmp_table.real_name=lex->name;
2637
	  tmp_table.db=select_lex->db;
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	  tmp_table.grant.privilege=priv;
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	  if (check_grant(thd, INSERT_ACL | CREATE_ACL, &tmp_table, 0,
			  UINT_MAX, 0))
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	    goto error;
	}
      }
2644 2645
      /* Don't yet allow changing of symlinks with ALTER TABLE */
      lex->create_info.data_file_name=lex->create_info.index_file_name=0;
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      /* ALTER TABLE ends previous transaction */
2647
      if (end_active_trans(thd))
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	res= -1;
      else
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2650
      {
2651
        thd->enable_slow_log= opt_log_slow_admin_statements;
2652
	res= mysql_alter_table(thd, select_lex->db, lex->name,
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2653 2654
			       &lex->create_info,
			       tables, lex->create_list,
2655
			       lex->key_list,
2656
			       select_lex->order_list.elements,
2657
                               (ORDER *) select_lex->order_list.first,
2658
			       lex->duplicates, lex->ignore, &lex->alter_info);
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2659
      }
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      break;
    }
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2662
#endif /*DONT_ALLOW_SHOW_COMMANDS*/
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2663
  case SQLCOM_RENAME_TABLE:
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2664 2665 2666
  {
    TABLE_LIST *table;
    if (check_db_used(thd,tables))
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      goto error;
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2668 2669
    for (table=tables ; table ; table=table->next->next)
    {
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      if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
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2671
		       &table->grant.privilege,0,0) ||
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	  check_access(thd, INSERT_ACL | CREATE_ACL, table->next->db,
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2673
		       &table->next->grant.privilege,0,0))
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	goto error;
      if (grant_option)
      {
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	TABLE_LIST old_list,new_list;
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2678 2679 2680 2681
	/*
	  we do not need initialize old_list and new_list because we will
	  come table[0] and table->next[0] there
	*/
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2682 2683 2684
	old_list=table[0];
	new_list=table->next[0];
	old_list.next=new_list.next=0;
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2685
	if (check_grant(thd, ALTER_ACL, &old_list, 0, UINT_MAX, 0) ||
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2686
	    (!test_all_bits(table->next->grant.privilege,
2687
			    INSERT_ACL | CREATE_ACL) &&
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2688 2689
	     check_grant(thd, INSERT_ACL | CREATE_ACL, &new_list, 0,
			 UINT_MAX, 0)))
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2690 2691 2692
	  goto error;
      }
    }
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2693
    query_cache_invalidate3(thd, tables, 0);
2694 2695 2696
    if (end_active_trans(thd))
      res= -1;
    else if (mysql_rename_tables(thd,tables))
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      res= -1;
    break;
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2699
  }
2700
#ifndef EMBEDDED_LIBRARY
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2701 2702
  case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2703
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
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2704 2705 2706
    DBUG_VOID_RETURN;
#else
    {
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2707
      if (check_global_access(thd, SUPER_ACL))
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2708 2709 2710 2711
	goto error;
      res = show_binlogs(thd);
      break;
    }
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2712
#endif
2713
#endif /* EMBEDDED_LIBRARY */
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2714
  case SQLCOM_SHOW_CREATE:
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2715
#ifdef DONT_ALLOW_SHOW_COMMANDS
2716
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
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2717 2718
    DBUG_VOID_RETURN;
#else
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2719
    {
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2720 2721
      if (check_db_used(thd, tables) ||
	  check_access(thd, SELECT_ACL | EXTRA_ACL, tables->db,
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2722
		       &tables->grant.privilege,0,0))
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2723
	goto error;
2724 2725 2726
      if (grant_option && check_grant(thd, SELECT_ACL, tables, 2, UINT_MAX, 0))
	goto error;
      res= mysqld_show_create(thd, tables);
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2727 2728
      break;
    }
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2729
#endif
2730 2731 2732
  case SQLCOM_CHECKSUM:
  {
    if (check_db_used(thd,tables) ||
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2733
	check_table_access(thd, SELECT_ACL | EXTRA_ACL , tables,0))
2734
      goto error; /* purecov: inspected */
2735
    res = mysql_checksum_table(thd, tables, &lex->check_opt);
2736 2737
    break;
  }
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2738
  case SQLCOM_REPAIR:
2739 2740
  {
    if (check_db_used(thd,tables) ||
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2741
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables,0))
2742
      goto error; /* purecov: inspected */
2743
    thd->enable_slow_log= opt_log_slow_admin_statements;
2744
    res = mysql_repair_table(thd, tables, &lex->check_opt);
2745 2746 2747 2748 2749 2750
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      mysql_update_log.write(thd, thd->query, thd->query_length);
      if (mysql_bin_log.is_open())
      {
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2751
	thd->clear_error(); // No binlog error generated
2752
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
2753 2754 2755
        mysql_bin_log.write(&qinfo);
      }
    }
2756 2757
    break;
  }
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2758
  case SQLCOM_CHECK:
2759 2760
  {
    if (check_db_used(thd,tables) ||
2761
	check_table_access(thd, SELECT_ACL | EXTRA_ACL , tables,0))
2762
      goto error; /* purecov: inspected */
2763
    thd->enable_slow_log= opt_log_slow_admin_statements;
2764 2765 2766
    res = mysql_check_table(thd, tables, &lex->check_opt);
    break;
  }
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2767 2768
  case SQLCOM_ANALYZE:
  {
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    if (check_db_used(thd,tables) ||
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2770
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables,0))
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      goto error; /* purecov: inspected */
2772
    thd->enable_slow_log= opt_log_slow_admin_statements;
2773
    res = mysql_analyze_table(thd, tables, &lex->check_opt);
2774 2775 2776 2777 2778 2779
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      mysql_update_log.write(thd, thd->query, thd->query_length);
      if (mysql_bin_log.is_open())
      {
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2780
	thd->clear_error(); // No binlog error generated
2781
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
2782 2783 2784
        mysql_bin_log.write(&qinfo);
      }
    }
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2785
    break;
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2786
  }
2787

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2788 2789
  case SQLCOM_OPTIMIZE:
  {
2790
    if (check_db_used(thd,tables) ||
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2791
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables,0))
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2792
      goto error; /* purecov: inspected */
2793
    thd->enable_slow_log= opt_log_slow_admin_statements;
2794 2795 2796
    res= (specialflag & (SPECIAL_SAFE_MODE | SPECIAL_NO_NEW_FUNC)) ?
      mysql_recreate_table(thd, tables, 1) :
      mysql_optimize_table(thd, tables, &lex->check_opt);
2797 2798 2799 2800 2801 2802
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      mysql_update_log.write(thd, thd->query, thd->query_length);
      if (mysql_bin_log.is_open())
      {
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2803
	thd->clear_error(); // No binlog error generated
2804
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
2805 2806 2807
        mysql_bin_log.write(&qinfo);
      }
    }
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    break;
  }
  case SQLCOM_UPDATE:
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2811 2812
    if (update_precheck(thd, tables))
      break;
2813 2814 2815 2816
    res= mysql_update(thd,tables,
                      select_lex->item_list,
                      lex->value_list,
                      select_lex->where,
2817
		      select_lex->order_list.elements,
2818 2819
                      (ORDER *) select_lex->order_list.first,
                      select_lex->select_limit,
2820
                      lex->duplicates, lex->ignore);
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2821 2822
    if (thd->net.report_error)
      res= -1;
2823 2824
    break;
  case SQLCOM_UPDATE_MULTI:
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2825
  {
2826
    if ((res= multi_update_precheck(thd, tables)))
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      break;
    res= mysql_multi_update(thd,tables,
			    &select_lex->item_list,
			    &lex->value_list,
			    select_lex->where,
			    select_lex->options,
2833
			    lex->duplicates, lex->ignore, unit, select_lex);
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2834
    break;
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2835
  }
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2836
  case SQLCOM_REPLACE:
2837 2838
  case SQLCOM_INSERT:
  {
2839
    if ((res= insert_precheck(thd, tables)))
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2840
      break;
2841 2842 2843
    res= mysql_insert(thd,tables,lex->field_list,lex->many_values,
                      lex->update_list, lex->value_list,
                      lex->duplicates, lex->ignore);
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2844 2845
    if (thd->net.report_error)
      res= -1;
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2846
    break;
2847
  }
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2848 2849 2850
  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
  {
2851
    TABLE_LIST *first_local_table= (TABLE_LIST *) select_lex->table_list.first;
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2852 2853
    TABLE_LIST dup_tables;
    TABLE *insert_table;
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2854
    if ((res= insert_precheck(thd, tables)))
2855
      break;
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2856

2857 2858
    /* Fix lock for first table */
    if (tables->lock_type == TL_WRITE_DELAYED)
2859
      tables->lock_type= TL_WRITE;
2860

2861 2862
    /* Don't unlock tables until command is written to binary log */
    select_lex->options|= SELECT_NO_UNLOCK;
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2863 2864

    select_result *result;
2865 2866 2867 2868
    unit->offset_limit_cnt= select_lex->offset_limit;
    unit->select_limit_cnt= select_lex->select_limit+select_lex->offset_limit;
    if (unit->select_limit_cnt < select_lex->select_limit)
      unit->select_limit_cnt= HA_POS_ERROR;		// No limit
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2869

2870
    if (find_real_table_in_list(tables->next, tables->db, tables->real_name))
2871
    {
2872 2873
      /* Using same table for INSERT and SELECT */
      select_lex->options |= OPTION_BUFFER_RESULT;
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2874
    }
2875

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    if ((res= open_and_lock_tables(thd, tables)))
      break;
      
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2879
    insert_table= tables->table;
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2880
    /* Skip first table, which is the table we are inserting in */
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    select_lex->table_list.first= (byte*) first_local_table->next;
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    tables= (TABLE_LIST *) select_lex->table_list.first;
    dup_tables= *first_local_table;
    first_local_table->next= 0;
    if (select_lex->group_list.elements != 0)
    {
      /*
        When we are using GROUP BY we can't refere to other tables in the
        ON DUPLICATE KEY part
      */         
      dup_tables.next= 0;
    }

    if (!(res= mysql_prepare_insert(thd, tables, first_local_table,
				    &dup_tables, insert_table,
                                    lex->field_list, 0,
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2897 2898
				    lex->update_list, lex->value_list,
				    lex->duplicates)) &&
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2899 2900
        (result= new select_insert(insert_table, first_local_table,
				   &dup_tables, &lex->field_list,
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2901
				   &lex->update_list, &lex->value_list,
2902
                                   lex->duplicates, lex->ignore)))
2903
    {
2904 2905 2906 2907 2908 2909 2910 2911 2912
      /*
        insert/replace from SELECT give its SELECT_LEX for SELECT,
        and item_list belong to SELECT
      */
      lex->select_lex.resolve_mode= SELECT_LEX::SELECT_MODE;
      res= handle_select(thd, lex, result);
      /* revert changes for SP */
      lex->select_lex.resolve_mode= SELECT_LEX::INSERT_MODE;
      delete result;
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      if (thd->net.report_error)
2914
        res= -1;
2915 2916 2917
    }
    else
      res= -1;
2918
    insert_table->insert_values= 0;        // Set by mysql_prepare_insert()
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    first_local_table->next= tables;
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    lex->select_lex.table_list.first= (byte*) first_local_table;
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    break;
  }
2923
  case SQLCOM_TRUNCATE:
2924 2925 2926 2927 2928
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
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2929
    if (check_one_table_access(thd, DELETE_ACL, tables))
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      goto error;
2931 2932 2933 2934 2935 2936
    /*
      Don't allow this within a transaction because we want to use
      re-generate table
    */
    if (thd->locked_tables || thd->active_transaction())
    {
2937
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION,NullS);
2938 2939
      goto error;
    }
2940
    res=mysql_truncate(thd, tables, 0);
2941
    break;
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2942
  case SQLCOM_DELETE:
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2943
  {
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    if ((res= delete_precheck(thd, tables)))
      break;
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    res = mysql_delete(thd,tables, select_lex->where,
2947
                       &select_lex->order_list,
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                       select_lex->select_limit, select_lex->options);
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    if (thd->net.report_error)
      res= -1;
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    break;
  }
2953
  case SQLCOM_DELETE_MULTI:
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  {
2955 2956
    TABLE_LIST *aux_tables=
      (TABLE_LIST *)thd->lex->auxilliary_table_list.first;
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2957 2958
    TABLE_LIST *target_tbl;
    uint table_count;
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2959
    multi_delete *result;
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2960

2961 2962
    if ((res= multi_delete_precheck(thd, tables, &table_count)))
      break;
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2963

unknown's avatar
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2964
    /* condition will be TRUE on SP re-excuting */
2965 2966
    if (select_lex->item_list.elements != 0)
      select_lex->item_list.empty();
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2967
    if (add_item_to_list(thd, new Item_null()))
2968
    {
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2969
      res= -1;
2970
      break;
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2971
    }
2972

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2973 2974 2975 2976
    thd->proc_info="init";
    if ((res=open_and_lock_tables(thd,tables)))
      break;
    /* Fix tables-to-be-deleted-from list to point at opened tables */
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2977 2978 2979
    for (target_tbl= (TABLE_LIST*) aux_tables;
	 target_tbl;
	 target_tbl= target_tbl->next)
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2980
    {
2981 2982 2983
      TABLE_LIST *orig= target_tbl->table_list;
      target_tbl->table= orig->table;
      /*
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2984
	 Multi-delete can't be constructed over-union => we always have
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2985
	 single SELECT on top and have to check underlying SELECTs of it
2986
      */
2987 2988
      if (lex->select_lex.check_updateable_in_subqueries(orig->db,
                                                         orig->real_name))
2989
      {
2990 2991 2992 2993
        my_error(ER_UPDATE_TABLE_USED, MYF(0),
                 orig->real_name);
        res= -1;
        break;
2994
      }
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2995
    }
2996

2997 2998
    if (!thd->is_fatal_error && (result= new multi_delete(thd,aux_tables,
							  table_count)))
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2999
    {
3000 3001 3002
      res= mysql_select(thd, &select_lex->ref_pointer_array,
			select_lex->get_table_list(),
			select_lex->with_wild,
3003
			select_lex->item_list,
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3004
			select_lex->where,
3005
			0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
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3006 3007
			(ORDER *)NULL,
			select_lex->options | thd->options |
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3008
			SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK,
3009
			result, unit, select_lex);
unknown's avatar
unknown committed
3010 3011
      if (thd->net.report_error)
	res= -1;
3012
      delete result;
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3013 3014 3015 3016 3017 3018
    }
    else
      res= -1;					// Error is not sent
    close_thread_tables(thd);
    break;
  }
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3019
  case SQLCOM_DROP_TABLE:
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3020
  {
3021 3022
    if (!lex->drop_temporary)
    {
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3023
      if (check_table_access(thd,DROP_ACL,tables,0))
3024 3025 3026 3027 3028 3029 3030
	goto error;				/* purecov: inspected */
      if (end_active_trans(thd))
      {
	res= -1;
	break;
      }
    }
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3031
    else
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3032 3033 3034 3035 3036 3037
    {
      /*
	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.
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3038 3039
	To not generate such irrelevant "table does not exist errors",
	we silently add IF EXISTS if TEMPORARY was used.
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3040 3041 3042
      */
      if (thd->slave_thread)
	lex->drop_if_exists= 1;
3043

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3044 3045
      /* So that DROP TEMPORARY TABLE gets to binlog at commit/rollback */
      thd->options|= OPTION_STATUS_NO_TRANS_UPDATE;
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3046
    }
3047
    res= mysql_rm_table(thd,tables,lex->drop_if_exists, lex->drop_temporary);
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3048 3049
  }
  break;
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3050
  case SQLCOM_DROP_INDEX:
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3051
    if (check_one_table_access(thd, INDEX_ACL, tables))
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3052
      goto error;				/* purecov: inspected */
3053 3054 3055
    if (end_active_trans(thd))
      res= -1;
    else
3056
      res = mysql_drop_index(thd, tables, &lex->alter_info);
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3057 3058
    break;
  case SQLCOM_SHOW_DATABASES:
3059
#if defined(DONT_ALLOW_SHOW_COMMANDS)
3060
    send_error(thd,ER_NOT_ALLOWED_COMMAND);   /* purecov: inspected */
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3061 3062 3063
    DBUG_VOID_RETURN;
#else
    if ((specialflag & SPECIAL_SKIP_SHOW_DB) &&
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3064
	check_global_access(thd, SHOW_DB_ACL))
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3065 3066 3067 3068 3069
      goto error;
    res= mysqld_show_dbs(thd, (lex->wild ? lex->wild->ptr() : NullS));
    break;
#endif
  case SQLCOM_SHOW_PROCESSLIST:
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3070
    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
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3071
      break;
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3072 3073
    mysqld_list_processes(thd,
			  thd->master_access & PROCESS_ACL ? NullS :
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3074
			  thd->priv_user,lex->verbose);
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3075
    break;
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3076 3077
  case SQLCOM_SHOW_STORAGE_ENGINES:
    res= mysqld_show_storage_engines(thd);
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3078 3079 3080 3081 3082 3083 3084
    break;
  case SQLCOM_SHOW_PRIVILEGES:
    res= mysqld_show_privileges(thd);
    break;
  case SQLCOM_SHOW_COLUMN_TYPES:
    res= mysqld_show_column_types(thd);
    break;
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3085
  case SQLCOM_SHOW_STATUS:
3086
    res= mysqld_show(thd,(lex->wild ? lex->wild->ptr() : NullS),status_vars,
3087
		     OPT_GLOBAL, &LOCK_status);
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3088 3089 3090
    break;
  case SQLCOM_SHOW_VARIABLES:
    res= mysqld_show(thd, (lex->wild ? lex->wild->ptr() : NullS),
3091 3092
		     init_vars, lex->option_type,
		     &LOCK_global_system_variables);
unknown's avatar
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3093
    break;
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3094 3095
  case SQLCOM_SHOW_LOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
3096
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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3097 3098 3099
    DBUG_VOID_RETURN;
#else
    {
unknown's avatar
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3100
      if (grant_option && check_access(thd, FILE_ACL, any_db,0,0,0))
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3101 3102 3103 3104 3105
	goto error;
      res= mysqld_show_logs(thd);
      break;
    }
#endif
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3106
  case SQLCOM_SHOW_TABLES:
3107
    /* FALL THROUGH */
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3108
#ifdef DONT_ALLOW_SHOW_COMMANDS
3109
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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3110 3111 3112
    DBUG_VOID_RETURN;
#else
    {
3113
      char *db=select_lex->db ? select_lex->db : thd->db;
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3114 3115
      if (!db)
      {
3116
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
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3117 3118 3119
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);				// Fix escaped '_'
3120
      if (check_db_name(db))
unknown's avatar
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3121
      {
3122
        net_printf(thd,ER_WRONG_DB_NAME, db);
3123
        goto error;
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3124
      }
unknown's avatar
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3125
      if (check_access(thd,SELECT_ACL,db,&thd->col_access,0,0))
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3126
	goto error;				/* purecov: inspected */
unknown's avatar
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3127
      if (!thd->col_access && check_grant_db(thd,db))
unknown's avatar
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3128
      {
unknown's avatar
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3129
	net_printf(thd, ER_DBACCESS_DENIED_ERROR,
unknown's avatar
unknown committed
3130 3131 3132 3133 3134
		   thd->priv_user,
		   thd->priv_host,
		   db);
	goto error;
      }
unknown's avatar
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3135
      /* grant is checked in mysqld_show_tables */
3136
      if (lex->describe)
3137
        res= mysqld_extend_show_tables(thd,db,
3138
				       (lex->wild ? lex->wild->ptr() : NullS));
unknown's avatar
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3139 3140 3141 3142 3143 3144
      else
	res= mysqld_show_tables(thd,db,
				(lex->wild ? lex->wild->ptr() : NullS));
      break;
    }
#endif
3145 3146 3147
  case SQLCOM_SHOW_OPEN_TABLES:
    res= mysqld_show_open_tables(thd,(lex->wild ? lex->wild->ptr() : NullS));
    break;
3148 3149
  case SQLCOM_SHOW_CHARSETS:
    res= mysqld_show_charsets(thd,(lex->wild ? lex->wild->ptr() : NullS));
3150
    break;
3151 3152 3153
  case SQLCOM_SHOW_COLLATIONS:
    res= mysqld_show_collations(thd,(lex->wild ? lex->wild->ptr() : NullS));
    break;
unknown's avatar
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3154 3155
  case SQLCOM_SHOW_FIELDS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
3156
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
unknown's avatar
unknown committed
3157 3158 3159
    DBUG_VOID_RETURN;
#else
    {
3160
      char *db=tables->db;
unknown's avatar
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3161
      remove_escape(db);			// Fix escaped '_'
3162
      remove_escape(tables->real_name);
3163
      if (check_access(thd,SELECT_ACL | EXTRA_ACL,db,
unknown's avatar
unknown committed
3164
		       &tables->grant.privilege, 0, 0))
unknown's avatar
unknown committed
3165
	goto error;				/* purecov: inspected */
unknown's avatar
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3166
      if (grant_option && check_grant(thd, SELECT_ACL, tables, 2, UINT_MAX, 0))
unknown's avatar
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3167 3168
	goto error;
      res= mysqld_show_fields(thd,tables,
unknown's avatar
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3169 3170
			      (lex->wild ? lex->wild->ptr() : NullS),
			      lex->verbose);
unknown's avatar
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3171 3172 3173 3174 3175
      break;
    }
#endif
  case SQLCOM_SHOW_KEYS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
3176
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
unknown's avatar
unknown committed
3177 3178 3179
    DBUG_VOID_RETURN;
#else
    {
3180
      char *db=tables->db;
unknown's avatar
unknown committed
3181
      remove_escape(db);			// Fix escaped '_'
3182
      remove_escape(tables->real_name);
unknown's avatar
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3183
      if (check_access(thd,SELECT_ACL | EXTRA_ACL,db,
unknown's avatar
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3184
		       &tables->grant.privilege, 0, 0))
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3185
	goto error;				/* purecov: inspected */
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3186
      if (grant_option && check_grant(thd, SELECT_ACL, tables, 2, UINT_MAX, 0))
unknown's avatar
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3187 3188 3189 3190 3191 3192
	goto error;
      res= mysqld_show_keys(thd,tables);
      break;
    }
#endif
  case SQLCOM_CHANGE_DB:
3193
    mysql_change_db(thd,select_lex->db);
unknown's avatar
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3194
    break;
3195

unknown's avatar
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3196 3197 3198
  case SQLCOM_LOAD:
  {
    uint privilege= (lex->duplicates == DUP_REPLACE ?
3199
		     INSERT_ACL | DELETE_ACL : INSERT_ACL);
3200 3201

    if (!lex->local_file)
unknown's avatar
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3202
    {
unknown's avatar
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3203
      if (check_access(thd,privilege | FILE_ACL,tables->db,0,0,0))
unknown's avatar
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3204 3205 3206 3207
	goto error;
    }
    else
    {
3208
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
unknown's avatar
unknown committed
3209
	  ! opt_local_infile)
3210
      {
3211
	send_error(thd,ER_NOT_ALLOWED_COMMAND);
3212 3213
	goto error;
      }
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3214
      if (check_one_table_access(thd, privilege, tables))
unknown's avatar
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3215 3216 3217
	goto error;
    }
    res=mysql_load(thd, lex->exchange, tables, lex->field_list,
3218
		   lex->duplicates, lex->ignore, (bool) lex->local_file, lex->lock_option);
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3219 3220
    break;
  }
3221

unknown's avatar
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3222
  case SQLCOM_SET_OPTION:
3223 3224
  {
    List<set_var_base> *lex_var_list= &lex->var_list;
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3225
    if (tables && ((res= check_table_access(thd, SELECT_ACL, tables,0)) ||
unknown's avatar
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3226 3227
		   (res= open_and_lock_tables(thd,tables))))
      break;
3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241
    if (lex->one_shot_set && not_all_support_one_shot(lex_var_list))
    {
      my_printf_error(0, "The SET ONE_SHOT syntax is reserved for \
purposes internal to the MySQL server", MYF(0));
      res= -1;
      break;
    }
    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;
3242
      send_ok(thd);
3243
    }
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3244 3245
    if (thd->net.report_error)
      res= -1;
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3246
    break;
3247
  }
unknown's avatar
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3248

unknown's avatar
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3249
  case SQLCOM_UNLOCK_TABLES:
3250 3251 3252 3253 3254 3255
    /*
      It is critical for mysqldump --single-transaction --master-data that
      UNLOCK TABLES does not implicitely commit a connection which has only
      done FLUSH TABLES WITH READ LOCK + BEGIN. If this assumption becomes
      false, mysqldump will not work.
    */
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3256
    unlock_locked_tables(thd);
unknown's avatar
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3257 3258
    if (thd->options & OPTION_TABLE_LOCK)
    {
unknown's avatar
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3259
      end_active_trans(thd);
unknown's avatar
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3260
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
unknown's avatar
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3261 3262
    }
    if (thd->global_read_lock)
3263
      unlock_global_read_lock(thd);
3264
    send_ok(thd);
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3265 3266
    break;
  case SQLCOM_LOCK_TABLES:
unknown's avatar
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3267
    unlock_locked_tables(thd);
3268
    if (check_db_used(thd,tables) || end_active_trans(thd))
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3269
      goto error;
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3270
    if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, tables,0))
3271
      goto error;
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3272
    thd->in_lock_tables=1;
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3273
    thd->options|= OPTION_TABLE_LOCK;
3274
    if (!(res= open_and_lock_tables(thd, tables)))
unknown's avatar
unknown committed
3275
    {
3276 3277 3278 3279
#ifdef HAVE_QUERY_CACHE
      if (thd->variables.query_cache_wlock_invalidate)
	query_cache.invalidate_locked_for_write(tables);
#endif /*HAVE_QUERY_CACHE*/
unknown's avatar
unknown committed
3280 3281
      thd->locked_tables=thd->lock;
      thd->lock=0;
3282
      send_ok(thd);
unknown's avatar
unknown committed
3283
    }
unknown's avatar
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3284 3285
    else
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
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3286 3287 3288
    thd->in_lock_tables=0;
    break;
  case SQLCOM_CREATE_DB:
3289
  {
3290 3291 3292 3293 3294
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
unknown's avatar
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3295
    char *alias;
unknown's avatar
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3296
    if (!(alias=thd->strdup(lex->name)) || check_db_name(lex->name))
unknown's avatar
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3297
    {
3298
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
unknown's avatar
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3299 3300
      break;
    }
3301 3302 3303 3304 3305 3306 3307
    /*
      If in a slave thread :
      CREATE DATABASE DB was certainly not preceded by USE DB.
      For that reason, 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.
    */
3308
#ifdef HAVE_REPLICATION
3309 3310 3311
    if (thd->slave_thread && 
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
unknown's avatar
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3312 3313
    {
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
3314
      break;
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3315
    }
3316
#endif
unknown's avatar
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3317
    if (check_access(thd,CREATE_ACL,lex->name,0,1,0))
3318
      break;
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3319
    res= mysql_create_db(thd,(lower_case_table_names == 2 ? alias : lex->name),
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3320
			 &lex->create_info, 0);
3321 3322
    break;
  }
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3323
  case SQLCOM_DROP_DB:
3324
  {
3325 3326 3327 3328 3329
    if (end_active_trans(thd))
    {
      res= -1;
      break;
    }
unknown's avatar
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3330
    char *alias;
unknown's avatar
unknown committed
3331
    if (!(alias=thd->strdup(lex->name)) || check_db_name(lex->name))
unknown's avatar
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3332
    {
3333
      net_printf(thd, ER_WRONG_DB_NAME, lex->name);
unknown's avatar
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3334 3335
      break;
    }
3336 3337 3338 3339 3340 3341 3342
    /*
      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.
    */
3343
#ifdef HAVE_REPLICATION
3344 3345 3346
    if (thd->slave_thread && 
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
unknown's avatar
unknown committed
3347 3348
    {
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
3349
      break;
unknown's avatar
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3350
    }
3351
#endif
unknown's avatar
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3352
    if (check_access(thd,DROP_ACL,lex->name,0,1,0))
3353
      break;
3354 3355
    if (thd->locked_tables || thd->active_transaction())
    {
3356
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
3357 3358
      goto error;
    }
3359 3360
    res=mysql_rm_db(thd, (lower_case_table_names == 2 ? alias : lex->name),
                    lex->drop_if_exists, 0);
3361 3362
    break;
  }
3363 3364
  case SQLCOM_ALTER_DB:
  {
3365 3366
    char *db= lex->name ? lex->name : thd->db;
    if (!db)
3367
    {
3368 3369 3370 3371 3372 3373
      send_error(thd, ER_NO_DB_ERROR);
      goto error;
    }
    if (!strip_sp(db) || check_db_name(db))
    {
      net_printf(thd, ER_WRONG_DB_NAME, db);
3374 3375
      break;
    }
unknown's avatar
unknown committed
3376 3377 3378
    /*
      If in a slave thread :
      ALTER DATABASE DB may not be preceded by USE DB.
3379
      For that reason, maybe db_ok() in sql/slave.cc did not check the
unknown's avatar
unknown committed
3380 3381 3382 3383
      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
3384
    if (thd->slave_thread &&
3385 3386
	(!db_ok(db, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(db)))
unknown's avatar
unknown committed
3387 3388 3389 3390 3391
    {
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
      break;
    }
#endif
3392
    if (check_access(thd, ALTER_ACL, db, 0, 1, 0))
3393 3394 3395
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
3396
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
3397 3398
      goto error;
    }
3399
    res= mysql_alter_db(thd, db, &lex->create_info);
3400 3401
    break;
  }
unknown's avatar
unknown committed
3402 3403 3404 3405
  case SQLCOM_SHOW_CREATE_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
3406
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
unknown's avatar
unknown committed
3407 3408
      break;
    }
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unknown committed
3409
    if (check_access(thd,SELECT_ACL,lex->name,0,1,0))
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3410
      break;
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3411
    res=mysqld_show_create_db(thd,lex->name,&lex->create_info);
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    break;
  }
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  case SQLCOM_CREATE_FUNCTION:
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3415
    if (check_access(thd,INSERT_ACL,"mysql",0,1,0))
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      break;
#ifdef HAVE_DLOPEN
    if (!(res = mysql_create_function(thd,&lex->udf)))
3419
      send_ok(thd);
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3420
#else
3421
    net_printf(thd, ER_CANT_OPEN_LIBRARY, lex->udf.dl, 0, "feature disabled");
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3422 3423 3424 3425
    res= -1;
#endif
    break;
  case SQLCOM_DROP_FUNCTION:
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3426
    if (check_access(thd,DELETE_ACL,"mysql",0,1,0))
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3427 3428
      break;
#ifdef HAVE_DLOPEN
3429
    if (!(res = mysql_drop_function(thd,&lex->udf.name)))
3430
      send_ok(thd);
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3431 3432 3433 3434
#else
    res= -1;
#endif
    break;
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3435
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3436 3437
  case SQLCOM_DROP_USER:
  {
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3438
    if (check_access(thd, GRANT_ACL,"mysql",0,1,0))
3439 3440 3441 3442 3443 3444
      break;
    if (!(res= mysql_drop_user(thd, lex->users_list)))
    {
      mysql_update_log.write(thd, thd->query, thd->query_length);
      if (mysql_bin_log.is_open())
      {
3445
	Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3446 3447 3448 3449 3450 3451 3452 3453
	mysql_bin_log.write(&qinfo);
      }
      send_ok(thd);
    }
    break;
  }
  case SQLCOM_REVOKE_ALL:
  {
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3454
    if (check_access(thd, GRANT_ACL ,"mysql",0,1,0))
3455 3456 3457 3458 3459 3460
      break;
    if (!(res = mysql_revoke_all(thd, lex->users_list)))
    {
      mysql_update_log.write(thd, thd->query, thd->query_length);
      if (mysql_bin_log.is_open())
      {
3461
	Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3462 3463 3464 3465 3466 3467
	mysql_bin_log.write(&qinfo);
      }
      send_ok(thd);
    }
    break;
  }
3468 3469 3470 3471
  case SQLCOM_REVOKE:
  case SQLCOM_GRANT:
  {
    if (check_access(thd, lex->grant | lex->grant_tot_col | GRANT_ACL,
3472
		     tables ? tables->db : select_lex->db,
3473
		     tables ? &tables->grant.privilege : 0,
3474
		     tables ? 0 : 1, 0))
3475 3476
      goto error;

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3477 3478 3479 3480
    /*
      Check that the user isn't trying to change a password for another
      user if he doesn't have UPDATE privilege to the MySQL database
    */
3481 3482 3483 3484 3485 3486 3487 3488 3489 3490

    if (thd->user)				// If not replication
    {
      LEX_USER *user;
      List_iterator <LEX_USER> user_list(lex->users_list);
      while ((user=user_list++))
      {
	if (user->password.str &&
	    (strcmp(thd->user,user->user.str) ||
	     user->host.str &&
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3491
	     my_strcasecmp(&my_charset_latin1,
3492
                           user->host.str, thd->host_or_ip)))
3493
	{
3494 3495 3496
	  if (check_access(thd, UPDATE_ACL, "mysql", 0, 1, 1))
	  {
	    send_error(thd, ER_PASSWORD_NOT_ALLOWED);
3497
	    goto error;
3498 3499
	  }
	  break;		  // We are allowed to do global changes
3500 3501 3502
	}
      }
    }
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3503 3504 3505 3506 3507 3508 3509 3510 3511 3512 3513 3514 3515
    if (specialflag & SPECIAL_NO_RESOLVE)
    {
      LEX_USER *user;
      List_iterator <LEX_USER> user_list(lex->users_list);
      while ((user=user_list++))
      {
	if (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);
      }
    }
3516 3517 3518 3519 3520
    if (tables)
    {
      if (grant_option && check_grant(thd,
				      (lex->grant | lex->grant_tot_col |
				       GRANT_ACL),
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3521
				      tables, 0, UINT_MAX, 0))
3522
	goto error;
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3523 3524 3525
      if (!(res = mysql_table_grant(thd,tables,lex->users_list, lex->columns,
				    lex->grant,
				    lex->sql_command == SQLCOM_REVOKE)))
3526
      {
3527
	mysql_update_log.write(thd, thd->query, thd->query_length);
3528 3529
	if (mysql_bin_log.is_open())
	{
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3530
          thd->clear_error();
3531
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3532 3533 3534 3535 3536 3537 3538 3539
	  mysql_bin_log.write(&qinfo);
	}
      }
    }
    else
    {
      if (lex->columns.elements)
      {
3540
	send_error(thd,ER_ILLEGAL_GRANT_FOR_TABLE);
3541 3542 3543 3544 3545 3546 3547
	res=1;
      }
      else
	res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
			  lex->sql_command == SQLCOM_REVOKE);
      if (!res)
      {
3548
	mysql_update_log.write(thd, thd->query, thd->query_length);
3549 3550
	if (mysql_bin_log.is_open())
	{
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3551
          thd->clear_error();
3552
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3553 3554
	  mysql_bin_log.write(&qinfo);
	}
3555
	if (mqh_used && lex->sql_command == SQLCOM_GRANT)
3556
	{
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3557 3558 3559
	  List_iterator <LEX_USER> str_list(lex->users_list);
	  LEX_USER *user;
	  while ((user=str_list++))
3560
	    reset_mqh(thd,user);
3561
	}
3562 3563 3564 3565
      }
    }
    break;
  }
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SCRUM  
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3566
#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/
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3567
  case SQLCOM_RESET:
3568 3569 3570 3571 3572 3573 3574
    /* 
       RESET commands are never written to the binary log, so we have to
       initialize this variable because RESET shares the same code as FLUSH
    */
    lex->no_write_to_binlog= 1;
  case SQLCOM_FLUSH:
  {
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3575
    if (check_global_access(thd,RELOAD_ACL) || check_db_used(thd, tables))
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3576
      goto error;
3577 3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594
    /*
      reload_acl_and_cache() will tell us if we are allowed to write to the
      binlog or not.
    */
    bool write_to_binlog;
    if (reload_acl_and_cache(thd, lex->type, tables, &write_to_binlog))
      send_error(thd, 0);
    else
    {
      /*
        We WANT to write and we CAN write.
        ! we write after unlocking the table.
      */
      if (!lex->no_write_to_binlog && write_to_binlog)
      {
        mysql_update_log.write(thd, thd->query, thd->query_length);
        if (mysql_bin_log.is_open())
        {
3595
          Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE);
3596 3597 3598 3599 3600
          mysql_bin_log.write(&qinfo);
        }
      }
      send_ok(thd);
    }
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3601
    break;
3602
  }
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  case SQLCOM_KILL:
    kill_one_thread(thd,lex->thread_id);
    break;
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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3607 3608
  case SQLCOM_SHOW_GRANTS:
    res=0;
3609 3610
    if ((thd->priv_user &&
	 !strcmp(thd->priv_user,lex->grant_user->user.str)) ||
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3611
	!check_access(thd, SELECT_ACL, "mysql",0,1,0))
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3612 3613 3614 3615
    {
      res = mysql_show_grants(thd,lex->grant_user);
    }
    break;
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3616
#endif
3617
  case SQLCOM_HA_OPEN:
3618
    if (check_db_used(thd,tables) ||
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3619
	check_table_access(thd,SELECT_ACL, tables,0))
3620 3621 3622 3623 3624 3625 3626 3627 3628
      goto error;
    res = mysql_ha_open(thd, tables);
    break;
  case SQLCOM_HA_CLOSE:
    if (check_db_used(thd,tables))
      goto error;
    res = mysql_ha_close(thd, tables);
    break;
  case SQLCOM_HA_READ:
3629 3630 3631 3632 3633
    /*
      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.
    */
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3634
    if (check_db_used(thd,tables))
3635
      goto error;
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3636
    res = mysql_ha_read(thd, tables, lex->ha_read_mode, lex->backup_dir,
3637 3638
			lex->insert_list, lex->ha_rkey_mode, select_lex->where,
			select_lex->select_limit, select_lex->offset_limit);
3639 3640
    break;

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3641
  case SQLCOM_BEGIN:
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3642 3643 3644 3645 3646 3647
    if (thd->locked_tables)
    {
      thd->lock=thd->locked_tables;
      thd->locked_tables=0;			// Will be automaticly closed
      close_thread_tables(thd);			// Free tables
    }
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unknown committed
3648 3649 3650 3651 3652 3653
    if (end_active_trans(thd))
    {
      res= -1;
    }
    else
    {
3654
      thd->options= ((thd->options & (ulong) ~(OPTION_STATUS_NO_TRANS_UPDATE)) |
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3655 3656
		     OPTION_BEGIN);
      thd->server_status|= SERVER_STATUS_IN_TRANS;
3657 3658 3659
      if (!(lex->start_transaction_opt & MYSQL_START_TRANS_OPT_WITH_CONS_SNAPSHOT) ||
          !(res= ha_start_consistent_snapshot(thd)))
        send_ok(thd);
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3660
    }
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3661 3662
    break;
  case SQLCOM_COMMIT:
3663 3664 3665 3666 3667
    /*
      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...)
    */
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3668
  {
3669
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
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3670 3671
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    if (!ha_commit(thd))
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3672
    {
3673
      send_ok(thd);
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3674
    }
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3675 3676 3677
    else
      res= -1;
    break;
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3678
  }
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3679 3680 3681
  case SQLCOM_ROLLBACK:
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    if (!ha_rollback(thd))
3682
    {
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unknown committed
3683 3684 3685 3686 3687 3688 3689 3690 3691 3692
      /*
        If a non-transactional table was updated, warn; don't warn if this is a
        slave thread (because when a slave thread executes a ROLLBACK, it has
        been read from the binary log, so it's 100% sure and normal to produce
        error ER_WARNING_NOT_COMPLETE_ROLLBACK. If we sent the warning to the
        slave SQL thread, it would not stop the thread but just be printed in
        the error log; but we don't want users to wonder why they have this
        message in the error log, so we don't send it.
      */
      if ((thd->options & OPTION_STATUS_NO_TRANS_UPDATE) && !thd->slave_thread)
3693
	send_warning(thd,ER_WARNING_NOT_COMPLETE_ROLLBACK,0);
3694
      else
3695
	send_ok(thd);
3696
    }
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3697 3698
    else
      res= -1;
3699
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
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3700
    break;
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3701 3702 3703
  case SQLCOM_ROLLBACK_TO_SAVEPOINT:
    if (!ha_rollback_to_savepoint(thd, lex->savepoint_name))
    {
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3704
      if ((thd->options & OPTION_STATUS_NO_TRANS_UPDATE) && !thd->slave_thread)
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3705
	send_warning(thd, ER_WARNING_NOT_COMPLETE_ROLLBACK, 0);
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3706
      else
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3707
	send_ok(thd);
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3708 3709 3710 3711
    }
    else
      res= -1;
    break;
3712
  case SQLCOM_SAVEPOINT:
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3713
    if (!ha_savepoint(thd, lex->savepoint_name))
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3714
      send_ok(thd);
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3715 3716
    else
      res= -1;
3717
    break;
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3718
  default:					/* Impossible */
3719
    send_ok(thd);
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3720 3721 3722
    break;
  }
  thd->proc_info="query end";			// QQ
3723
  if (thd->one_shot_set)
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3724 3725 3726 3727 3728 3729 3730 3731
  {
    /*
      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)
3732
    {
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unknown committed
3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744
      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;
3745
    }
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3746
  }
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3747
  if (res < 0)
3748
    send_error(thd,thd->killed ? ER_SERVER_SHUTDOWN : 0);
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3749 3750

error:
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3751 3752 3753 3754 3755 3756 3757 3758
  if (unlikely(slave_fake_lock))
  {
    DBUG_PRINT("info",("undoing faked lock"));
    thd->lock= thd->locked_tables;
    thd->locked_tables= fake_prev_lock;
    if (thd->lock == thd->locked_tables)
      thd->lock= 0;
  }
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3759 3760 3761 3762
  DBUG_VOID_RETURN;
}


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3763 3764
/*
  Check grants for commands which work only with one table and all other
3765
  tables belonging to subselects or implicitly opened tables.
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3766

3767
  SYNOPSIS
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3768 3769 3770 3771
    check_one_table_access()
    thd			Thread handler
    privilege		requested privelage
    tables		table list of command
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3772 3773 3774

  RETURN
    0 - OK
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3775
    1 - access denied, error is sent to client
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3776
*/
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3777 3778

int check_one_table_access(THD *thd, ulong privilege, TABLE_LIST *tables)
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3779
{
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3780 3781
  if (check_access(thd, privilege, tables->db, &tables->grant.privilege,0,0))
    return 1;
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3782

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3783
  /* Show only 1 table for check_grant */
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3784
  if (grant_option && check_grant(thd, privilege, tables, 0, 1, 0))
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3785
    return 1;
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3786

3787
  /* Check rights on tables of subselects and implictly opened tables */
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3788 3789
  TABLE_LIST *subselects_tables;
  if ((subselects_tables= tables->next))
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3790
  {
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3791
    if ((check_table_access(thd, SELECT_ACL, subselects_tables,0)))
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3792 3793 3794
      return 1;
  }
  return 0;
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3795 3796 3797
}


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3798
/****************************************************************************
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3799
  Get the user (global) and database privileges for all used tables
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3800 3801 3802 3803 3804 3805 3806 3807 3808 3809 3810 3811 3812

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

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

    save_priv	In this we store global and db level grants for the table
		Note that we don't store db level grants if the global grants
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3813 3814
                is enough to satisfy the request and the global grants contains
                a SELECT grant.
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3815 3816 3817
****************************************************************************/

bool
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3818
check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
3819
	     bool dont_check_global_grants, bool no_errors)
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3820
{
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3821
  DBUG_ENTER("check_access");
3822 3823
  DBUG_PRINT("enter",("db: '%s'  want_access: %lu  master_access: %lu",
                      db ? db : "", want_access, thd->master_access));
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3824 3825
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  ulong db_access;
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3826
  bool  db_is_pattern= test(want_access & GRANT_ACL);
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3827 3828
#endif
  ulong dummy;
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3829 3830 3831 3832 3833
  if (save_priv)
    *save_priv=0;
  else
    save_priv= &dummy;

3834
  if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
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3835
  {
3836
    if (!no_errors)
3837
      send_error(thd,ER_NO_DB_ERROR);	/* purecov: tested */
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3838
    DBUG_RETURN(TRUE);				/* purecov: tested */
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3839 3840
  }

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3841 3842 3843
#ifdef NO_EMBEDDED_ACCESS_CHECKS
  DBUG_RETURN(0);
#else
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3844 3845
  if ((thd->master_access & want_access) == want_access)
  {
3846 3847 3848 3849 3850 3851 3852
    /*
      If we don't have a global SELECT privilege, we have to get the database
      specific access rights to be able to handle queries of type
      UPDATE t1 SET a=1 WHERE b > 0
    */
    db_access= thd->db_access;
    if (!(thd->master_access & SELECT_ACL) &&
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3853
	(db && (!thd->db || db_is_pattern || strcmp(db,thd->db))))
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3854
      db_access=acl_get(thd->host, thd->ip, thd->priv_user, db, db_is_pattern);
3855
    *save_priv=thd->master_access | db_access;
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3856
    DBUG_RETURN(FALSE);
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3857
  }
3858
  if (((want_access & ~thd->master_access) & ~(DB_ACLS | EXTRA_ACL)) ||
3859
      ! db && dont_check_global_grants)
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unknown committed
3860
  {						// We can never grant this
3861
    if (!no_errors)
3862
      net_printf(thd,ER_ACCESS_DENIED_ERROR,
3863
		 thd->priv_user,
3864
		 thd->priv_host,
3865
		 thd->password ? ER(ER_YES) : ER(ER_NO));/* purecov: tested */
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    DBUG_RETURN(TRUE);				/* purecov: tested */
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3867 3868 3869
  }

  if (db == any_db)
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3870
    DBUG_RETURN(FALSE);				// Allow select on anything
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3871

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3872
  if (db && (!thd->db || db_is_pattern || strcmp(db,thd->db)))
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3873
    db_access=acl_get(thd->host, thd->ip, thd->priv_user, db, db_is_pattern);
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3874 3875
  else
    db_access=thd->db_access;
3876 3877
  DBUG_PRINT("info",("db_access: %lu", db_access));
  /* Remove SHOW attribute and access rights we already have */
3878
  want_access &= ~(thd->master_access | EXTRA_ACL);
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3879
  db_access= ((*save_priv=(db_access | thd->master_access)) & want_access);
3880 3881

  /* grant_option is set if there exists a single table or column grant */
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unknown committed
3882
  if (db_access == want_access ||
3883
      ((grant_option && !dont_check_global_grants) &&
3884
       !(want_access & ~(db_access | TABLE_ACLS))))
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3885
    DBUG_RETURN(FALSE);				/* Ok */
3886
  if (!no_errors)
3887
    net_printf(thd,ER_DBACCESS_DENIED_ERROR,
3888
	       thd->priv_user,
3889
	       thd->priv_host,
3890
	       db ? db : thd->db ? thd->db : "unknown"); /* purecov: tested */
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3891
  DBUG_RETURN(TRUE);				/* purecov: tested */
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3892
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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}


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/*
  check for global access and give descriptive error message if it fails

  SYNOPSIS
    check_global_access()
    thd			Thread handler
    want_access		Use should have any of these global rights

  WARNING
    One gets access rigth if one has ANY of the rights in want_access
    This is useful as one in most cases only need one global right,
    but in some case we want to check if the user has SUPER or
    REPL_CLIENT_ACL rights.

  RETURN
    0	ok
    1	Access denied.  In this case an error is sent to the client
*/
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bool check_global_access(THD *thd, ulong want_access)
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{
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#ifdef NO_EMBEDDED_ACCESS_CHECKS
  return 0;
#else
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  char command[128];
3921
  if ((thd->master_access & want_access))
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    return 0;
  get_privilege_desc(command, sizeof(command), want_access);
3924
  net_printf(thd,ER_SPECIFIC_ACCESS_DENIED_ERROR,
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	     command);
  return 1;
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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}


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

3936
bool
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check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables,
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		   bool no_errors)
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{
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  uint found=0;
  ulong found_access=0;
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  TABLE_LIST *org_tables=tables;
  for (; tables ; tables=tables->next)
  {
3945 3946 3947 3948
    if (tables->derived ||
        (tables->table && (int)tables->table->tmp_table) ||
        my_tz_check_n_skip_implicit_tables(&tables,
                                           thd->lex->time_zone_tables_used))
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      continue;
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    if ((thd->master_access & want_access) == (want_access & ~EXTRA_ACL) &&
	thd->db)
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      tables->grant.privilege= want_access;
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    else if (tables->db && tables->db == thd->db)
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    {
      if (found && !grant_option)		// db already checked
	tables->grant.privilege=found_access;
      else
      {
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	if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
			 0, no_errors))
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	  return TRUE;				// Access denied
	found_access=tables->grant.privilege;
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	found=1;
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      }
    }
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    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
3967
			  0, no_errors))
3968
      return TRUE;
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  }
  if (grant_option)
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    return check_grant(thd,want_access & ~EXTRA_ACL,org_tables,
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		       test(want_access & EXTRA_ACL), UINT_MAX, no_errors);
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  return FALSE;
}

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bool check_merge_table_access(THD *thd, char *db,
			      TABLE_LIST *table_list)
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{
  int error=0;
  if (table_list)
  {
3982
    /* Check that all tables use the current database */
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    TABLE_LIST *tmp;
    for (tmp=table_list; tmp ; tmp=tmp->next)
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    {
      if (!tmp->db || !tmp->db[0])
	tmp->db=db;
    }
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    error=check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
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			     table_list,0);
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  }
  return error;
}

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static bool check_db_used(THD *thd,TABLE_LIST *tables)
{
  for (; tables ; tables=tables->next)
  {
    if (!tables->db)
    {
      if (!(tables->db=thd->db))
      {
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: tested */
	return TRUE;				/* purecov: tested */
      }
    }
  }
  return FALSE;
}
4011

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/****************************************************************************
	Check stack size; Send error if there isn't enough stack to continue
****************************************************************************/

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

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#ifndef DBUG_OFF
long max_stack_used;
#endif

4026
#ifndef EMBEDDED_LIBRARY
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bool check_stack_overrun(THD *thd,char *buf __attribute__((unused)))
{
  long stack_used;
  if ((stack_used=used_stack(thd->thread_stack,(char*) &stack_used)) >=
      (long) thread_stack_min)
  {
    sprintf(errbuff[0],ER(ER_STACK_OVERRUN),stack_used,thread_stack);
    my_message(ER_STACK_OVERRUN,errbuff[0],MYF(0));
4035
    thd->fatal_error();
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    return 1;
  }
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#ifndef DBUG_OFF
  max_stack_used= max(max_stack_used, stack_used);
#endif
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  return 0;
}
4043
#endif /* EMBEDDED_LIBRARY */
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#define MY_YACC_INIT 1000			// Start with big alloc
#define MY_YACC_MAX  32000			// Because of 'short'

4048
bool my_yyoverflow(short **yyss, YYSTYPE **yyvs, ulong *yystacksize)
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{
  LEX	*lex=current_lex;
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  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;
}

/****************************************************************************
4077
  Initialize global thd variables needed for query
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****************************************************************************/

4080
void
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mysql_init_query(THD *thd, uchar *buf, uint length)
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{
  DBUG_ENTER("mysql_init_query");
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  lex_start(thd, buf, length);
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  mysql_reset_thd_for_next_command(thd);
  DBUG_VOID_RETURN;
}


/*
 Reset THD part responsible for command processing state.

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

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

void mysql_reset_thd_for_next_command(THD *thd)
{
  DBUG_ENTER("mysql_reset_thd_for_next_command");
4106
  thd->free_list= 0;
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  thd->select_number= 1;
  thd->total_warn_count= 0;                     // Warnings for this query
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  thd->last_insert_id_used= thd->query_start_used= thd->insert_id_used=0;
  thd->sent_row_count= thd->examined_row_count= 0;
4111
  thd->is_fatal_error= thd->rand_used= thd->time_zone_used= 0;
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  thd->server_status&= ~ (SERVER_MORE_RESULTS_EXISTS | 
			  SERVER_QUERY_NO_INDEX_USED |
			  SERVER_QUERY_NO_GOOD_INDEX_USED);
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  thd->tmp_table_used= 0;
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  if (opt_bin_log)
    reset_dynamic(&thd->user_var_events);
4118
  thd->clear_error();
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  DBUG_VOID_RETURN;
}

4122

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void
mysql_init_select(LEX *lex)
{
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  SELECT_LEX *select_lex= lex->current_select;
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  select_lex->init_select();
4128
  select_lex->select_limit= HA_POS_ERROR;
4129 4130
  if (select_lex == &lex->select_lex)
  {
4131
    DBUG_ASSERT(lex->result == 0);
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    lex->exchange= 0;
  }
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}

4136

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bool
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mysql_new_select(LEX *lex, bool move_down)
4139
{
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  SELECT_LEX *select_lex;
  if (!(select_lex= new(lex->thd->mem_root) SELECT_LEX()))
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    return 1;
4143
  select_lex->select_number= ++lex->thd->select_number;
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  select_lex->init_query();
  select_lex->init_select();
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  /*
    Don't evaluate this subquery during statement prepare even if
    it's a constant one. The flag is switched off in the end of
    mysql_stmt_prepare.
  */
  if (lex->thd->current_arena->is_stmt_prepare())
    select_lex->uncacheable|= UNCACHEABLE_PREPARE;

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  if (move_down)
  {
4156
    lex->subqueries= TRUE;
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    /* first select_lex of subselect or derived table */
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    SELECT_LEX_UNIT *unit;
    if (!(unit= new(lex->thd->mem_root) SELECT_LEX_UNIT()))
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      return 1;
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    unit->init_query();
    unit->init_select();
4164
    unit->thd= lex->thd;
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    unit->include_down(lex->current_select);
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    unit->link_next= 0;
    unit->link_prev= 0;
4168
    unit->return_to= lex->current_select;
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    select_lex->include_down(unit);
4170
    // TODO: assign resolve_mode for fake subquery after merging with new tree
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  }
  else
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  {
4174
    select_lex->include_neighbour(lex->current_select);
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    SELECT_LEX_UNIT *unit= select_lex->master_unit();
    SELECT_LEX *fake= unit->fake_select_lex;
    if (!fake)
    {
      /*
	as far as we included SELECT_LEX for UNION unit should have
	fake SELECT_LEX for UNION processing
      */
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      if (!(fake= unit->fake_select_lex= new(lex->thd->mem_root) SELECT_LEX()))
        return 1;
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      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;
4190
      fake->select_limit= HA_POS_ERROR;
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    }
  }
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4194
  select_lex->master_unit()->global_parameters= select_lex;
4195
  select_lex->include_global((st_select_lex_node**)&lex->all_selects_list);
4196
  lex->current_select= select_lex;
4197
  select_lex->resolve_mode= SELECT_LEX::SELECT_MODE;
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  return 0;
4199
}
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/*
  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)
{
4216
  THD *thd;
4217
  LEX *lex;
4218
  LEX_STRING tmp, null_lex_string;
4219 4220
  Item *var;
  char buff[MAX_SYS_VAR_LENGTH*2+4+8], *end;
4221
  DBUG_ENTER("create_select_for_variable");
4222 4223

  thd= current_thd;
4224
  lex= thd->lex;
4225 4226 4227 4228
  mysql_init_select(lex);
  lex->sql_command= SQLCOM_SELECT;
  tmp.str= (char*) var_name;
  tmp.length=strlen(var_name);
4229
  bzero((char*) &null_lex_string.str, sizeof(null_lex_string));
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  /*
    We set the name of Item to @@session.var_name because that then is used
    as the column name in the output.
  */
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  if ((var= get_system_var(thd, OPT_SESSION, tmp, null_lex_string)))
  {
    end= strxmov(buff, "@@session.", var_name, NullS);
    var->set_name(buff, end-buff, system_charset_info);
    add_item_to_list(thd, var);
  }
4240 4241 4242
  DBUG_VOID_RETURN;
}

4243

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void mysql_init_multi_delete(LEX *lex)
{
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  lex->sql_command=  SQLCOM_DELETE_MULTI;
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  mysql_init_select(lex);
4248
  lex->select_lex.select_limit= lex->unit.select_limit_cnt=
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    HA_POS_ERROR;
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  lex->select_lex.table_list.save_and_clear(&lex->auxilliary_table_list);
4251
  lex->lock_option= using_update_log ? TL_READ_NO_INSERT : TL_READ;
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}
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4254

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/*
  When you modify mysql_parse(), you may need to mofify
  mysql_test_parse_for_slave() in this same file.
*/
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4260
void mysql_parse(THD *thd, char *inBuf, uint length)
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{
  DBUG_ENTER("mysql_parse");

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  mysql_init_query(thd, (uchar*) inBuf, length);
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  if (query_cache_send_result_to_client(thd, inBuf, length) <= 0)
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  {
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    LEX *lex= thd->lex;
4268
    if (!yyparse((void *)thd) && ! thd->is_fatal_error)
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    {
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
4271
      if (mqh_used && thd->user_connect &&
4272
	  check_mqh(thd, lex->sql_command))
4273 4274 4275 4276
      {
	thd->net.error = 0;
      }
      else
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#endif
4278
      {
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	if (thd->net.report_error)
	  send_error(thd, 0, NullS);
	else
	{
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          /*
            Binlog logs a string starting from thd->query and having length
            thd->query_length; so we set thd->query_length correctly (to not
            log several statements in one event, when we executed only first).
            We set it to not see the ';' (otherwise it would get into binlog
            and Query_log_event::print() would give ';;' output).
            This also helps display only the current query in SHOW
            PROCESSLIST.
            Note that we don't need LOCK_thread_count to modify query_length.
          */
          if (lex->found_colon &&
              (thd->query_length= (ulong)(lex->found_colon - thd->query)))
            thd->query_length--;
          /* Actually execute the query */
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	  mysql_execute_command(thd);
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	  query_cache_end_of_result(thd);
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	}
4300
      }
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    }
    else
4303 4304
    {
      DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
4305
			 thd->is_fatal_error));
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      query_cache_abort(&thd->net);
4307
    }
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    thd->proc_info="freeing items";
4309
    thd->end_statement();
4310
    DBUG_ASSERT(thd->change_list.is_empty());
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  }
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  DBUG_VOID_RETURN;
}


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#ifdef HAVE_REPLICATION
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/*
  Usable by the replication SQL thread only: just parse a query to know if it
  can be ignored because of replicate-*-table rules.

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

bool mysql_test_parse_for_slave(THD *thd, char *inBuf, uint length)
{
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  LEX *lex= thd->lex;
4329 4330
  bool error= 0;

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  mysql_init_query(thd, (uchar*) inBuf, length);
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  if (!yyparse((void*) thd) && ! thd->is_fatal_error &&
4333 4334
      all_tables_not_ok(thd,(TABLE_LIST*) lex->select_lex.table_list.first))
    error= 1;                /* Ignore question */
4335
  thd->end_statement();
4336 4337
  return error;
}
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#endif
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4340

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/*****************************************************************************
** Store field definition for create
** Return 0 if ok
******************************************************************************/

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bool add_field_to_list(THD *thd, char *field_name, enum_field_types type,
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		       char *length, char *decimals,
4348
		       uint type_modifier,
4349 4350
		       Item *default_value, Item *on_update_value,
                       LEX_STRING *comment,
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		       char *change,
                       List<String> *interval_list, CHARSET_INFO *cs,
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		       uint uint_geom_type)
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{
  register create_field *new_field;
4356
  LEX  *lex= thd->lex;
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  uint allowed_type_modifier=0;
4358
  char warn_buff[MYSQL_ERRMSG_SIZE];
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  DBUG_ENTER("add_field_to_list");

  if (strlen(field_name) > NAME_LEN)
  {
4363
    net_printf(thd, ER_TOO_LONG_IDENT, field_name); /* purecov: inspected */
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    DBUG_RETURN(1);				/* purecov: inspected */
  }
  if (type_modifier & PRI_KEY_FLAG)
  {
    lex->col_list.push_back(new key_part_spec(field_name,0));
4369
    lex->key_list.push_back(new Key(Key::PRIMARY, NullS, HA_KEY_ALG_UNDEF,
4370
				    0, lex->col_list));
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    lex->col_list.empty();
  }
  if (type_modifier & (UNIQUE_FLAG | UNIQUE_KEY_FLAG))
  {
    lex->col_list.push_back(new key_part_spec(field_name,0));
4376
    lex->key_list.push_back(new Key(Key::UNIQUE, NullS, HA_KEY_ALG_UNDEF, 0,
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				    lex->col_list));
    lex->col_list.empty();
  }

4381
  if (default_value)
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  {
4383
    /* 
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      Default value should be literal => basic constants =>
      no need fix_fields()
4386 4387 4388
      
      We allow only one function as part of default value - 
      NOW() as default for TIMESTAMP type.
4389
    */
4390 4391 4392 4393 4394 4395 4396 4397
    if (default_value->type() == Item::FUNC_ITEM && 
        !(((Item_func*)default_value)->functype() == Item_func::NOW_FUNC &&
         type == FIELD_TYPE_TIMESTAMP))
    {
      net_printf(thd, ER_INVALID_DEFAULT, field_name);
      DBUG_RETURN(1);
    }
    else if (default_value->type() == Item::NULL_ITEM)
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    {
4399
      default_value= 0;
4400 4401 4402
      if ((type_modifier & (NOT_NULL_FLAG | AUTO_INCREMENT_FLAG)) ==
	  NOT_NULL_FLAG)
      {
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	net_printf(thd,ER_INVALID_DEFAULT,field_name);
4404 4405 4406 4407 4408
	DBUG_RETURN(1);
      }
    }
    else if (type_modifier & AUTO_INCREMENT_FLAG)
    {
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      net_printf(thd, ER_INVALID_DEFAULT, field_name);
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      DBUG_RETURN(1);
    }
  }
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  if (on_update_value && type != FIELD_TYPE_TIMESTAMP)
  {
    net_printf(thd, ER_INVALID_ON_UPDATE, field_name);
    DBUG_RETURN(1);
  }
    
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  if (!(new_field=new create_field()))
    DBUG_RETURN(1);
  new_field->field=0;
  new_field->field_name=field_name;
4424
  new_field->def= default_value;
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  new_field->flags= type_modifier;
  new_field->unireg_check= (type_modifier & AUTO_INCREMENT_FLAG ?
			    Field::NEXT_NUMBER : Field::NONE);
  new_field->decimals= decimals ? (uint) set_zone(atoi(decimals),0,
						  NOT_FIXED_DEC-1) : 0;
  new_field->sql_type=type;
  new_field->length=0;
  new_field->change=change;
  new_field->interval=0;
  new_field->pack_length=0;
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  new_field->charset=cs;
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  new_field->geom_type= (Field::geometry_type) uint_geom_type;
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  if (!comment)
  {
    new_field->comment.str=0;
    new_field->comment.length=0;
  }
  else
  {
    /* In this case comment is always of type Item_string */
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    new_field->comment.str=   (char*) comment->str;
    new_field->comment.length=comment->length;
4448
  }
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  if (length && !(new_field->length= (uint) atoi(length)))
    length=0; /* purecov: inspected */
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  uint sign_len=type_modifier & UNSIGNED_FLAG ? 0 : 1;

  if (new_field->length && new_field->decimals &&
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      new_field->length < new_field->decimals+1 &&
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      new_field->decimals != NOT_FIXED_DEC)
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    new_field->length=new_field->decimals+1; /* purecov: inspected */
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  switch (type) {
  case FIELD_TYPE_TINY:
4460
    if (!length) new_field->length=MAX_TINYINT_WIDTH+sign_len;
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    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_SHORT:
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    if (!length) new_field->length=MAX_SMALLINT_WIDTH+sign_len;
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    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_INT24:
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    if (!length) new_field->length=MAX_MEDIUMINT_WIDTH+sign_len;
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    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_LONG:
4472
    if (!length) new_field->length=MAX_INT_WIDTH+sign_len;
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    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_LONGLONG:
4476
    if (!length) new_field->length=MAX_BIGINT_WIDTH;
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    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_NULL:
    break;
  case FIELD_TYPE_DECIMAL:
    if (!length)
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    {
      if ((new_field->length= new_field->decimals))
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        new_field->length++;
      else
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        new_field->length= 10;                  // Default length for DECIMAL
    }
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    if (new_field->length < MAX_FIELD_WIDTH)	// Skip wrong argument
    {
      new_field->length+=sign_len;
      if (new_field->decimals)
	new_field->length++;
    }
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    break;
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  case FIELD_TYPE_STRING:
  case FIELD_TYPE_VAR_STRING:
4498
    if (new_field->length <= MAX_FIELD_CHARLENGTH || default_value)
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      break;
    /* Convert long CHAR() and VARCHAR columns to TEXT or BLOB */
    new_field->sql_type= FIELD_TYPE_BLOB;
    sprintf(warn_buff, ER(ER_AUTO_CONVERT), field_name, "CHAR",
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	    (cs == &my_charset_bin) ? "BLOB" : "TEXT");
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    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_AUTO_CONVERT,
		 warn_buff);
    /* fall through */
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  case FIELD_TYPE_BLOB:
  case FIELD_TYPE_TINY_BLOB:
  case FIELD_TYPE_LONG_BLOB:
  case FIELD_TYPE_MEDIUM_BLOB:
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  case FIELD_TYPE_GEOMETRY:
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    if (new_field->length)
    {
      /* The user has given a length to the blob column */
      if (new_field->length < 256)
	type= FIELD_TYPE_TINY_BLOB;
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      else if (new_field->length < 65536)
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	type= FIELD_TYPE_BLOB;
      else if (new_field->length < 256L*256L*256L)
	type= FIELD_TYPE_MEDIUM_BLOB;
      else
	type= FIELD_TYPE_LONG_BLOB;
      new_field->length= 0;
    }
    new_field->sql_type= type;
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    if (default_value)				// Allow empty as default value
    {
      String str,*res;
      res=default_value->val_str(&str);
      if (res->length())
      {
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	net_printf(thd,ER_BLOB_CANT_HAVE_DEFAULT,field_name); /* purecov: inspected */
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	DBUG_RETURN(1); /* purecov: inspected */
      }
      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)
      {
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	net_printf(thd,ER_WRONG_FIELD_SPEC,field_name);
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	DBUG_RETURN(1);
      }
      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
4582
    else if (new_field->length != 19)
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    {
4584 4585 4586 4587
      /*
        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 */
    }
4591
    new_field->flags|= ZEROFILL_FLAG | UNSIGNED_FLAG;
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    if (default_value)
    {
      /* Grammar allows only NOW() value for ON UPDATE clause */
      if (default_value->type() == Item::FUNC_ITEM && 
          ((Item_func*)default_value)->functype() == Item_func::NOW_FUNC)
      {
        new_field->unireg_check= (on_update_value?Field::TIMESTAMP_DNUN_FIELD:
                                                  Field::TIMESTAMP_DN_FIELD);
        /*
          We don't need default value any longer moreover it is dangerous.
          Everything handled by unireg_check further.
        */
        new_field->def= 0;
      }
      else
        new_field->unireg_check= (on_update_value?Field::TIMESTAMP_UN_FIELD:
                                                  Field::NONE);
    }
    else
    {
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      /*
        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
4620
        information about all TIMESTAMP fields in table will be availiable.
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        If we have TIMESTAMP NULL column without explicit DEFAULT value
        we treat it as having DEFAULT NULL attribute.
4624
      */
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      new_field->unireg_check= on_update_value ?
                               Field::TIMESTAMP_UN_FIELD :
                               (new_field->flags & NOT_NULL_FLAG ?
                                Field::TIMESTAMP_OLD_FIELD:
                                Field::NONE);
4630
    }
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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:
    {
4647
      if (interval_list->elements > sizeof(longlong)*8)
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      {
4649 4650
        net_printf(thd,ER_TOO_BIG_SET,field_name); /* purecov: inspected */
        DBUG_RETURN(1);				/* purecov: inspected */
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      }
4652
      new_field->pack_length= get_set_pack_length(interval_list->elements);
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      List_iterator<String> it(*interval_list);
      String *tmp;
      while ((tmp= it++))
        new_field->interval_list.push_back(tmp);
      /*
        Set fake length to 1 to pass the below conditions.
        Real length will be set in mysql_prepare_table()
        when we know the character set of the column
      */
      new_field->length= 1;
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    }
    break;
  case FIELD_TYPE_ENUM:
    {
4668
      // Should be safe
4669
      new_field->pack_length= get_enum_pack_length(interval_list->elements);
4670 4671 4672 4673 4674 4675

      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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    }
4677
    break;
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  }

4680 4681
  if ((new_field->length > MAX_FIELD_CHARLENGTH && type != FIELD_TYPE_SET && 
       type != FIELD_TYPE_ENUM) ||
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      (!new_field->length && !(new_field->flags & BLOB_FLAG) &&
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       type != FIELD_TYPE_STRING &&
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       type != FIELD_TYPE_VAR_STRING && type != FIELD_TYPE_GEOMETRY))
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  {
4686
    net_printf(thd,ER_TOO_BIG_FIELDLENGTH,field_name,
4687
	       MAX_FIELD_CHARLENGTH);		/* purecov: inspected */
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    DBUG_RETURN(1);				/* purecov: inspected */
  }
  type_modifier&= AUTO_INCREMENT_FLAG;
  if ((~allowed_type_modifier) & type_modifier)
  {
4693
    net_printf(thd,ER_WRONG_FIELD_SPEC,field_name);
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    DBUG_RETURN(1);
  }
  if (!new_field->pack_length)
    new_field->pack_length=calc_pack_length(new_field->sql_type ==
					    FIELD_TYPE_VAR_STRING ?
					    FIELD_TYPE_STRING :
					    new_field->sql_type,
					    new_field->length);
  lex->create_list.push_back(new_field);
  lex->last_field=new_field;
  DBUG_RETURN(0);
}

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

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

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

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  if (!(order = (ORDER *) thd->alloc(sizeof(ORDER)+sizeof(Item*))))
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    return 1;
  item_ptr = (Item**) (order+1);
  *item_ptr= item;
  order->item=item_ptr;
  order->free_me=0;
4726
  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)
{
4735 4736
  if (!*name)					// For empty DB names
    return;
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  char *to;
#ifdef USE_MB
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  char *strend=name+(uint) strlen(name);
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#endif
  for (to=name; *name ; name++)
  {
#ifdef USE_MB
    int l;
/*    if ((l = ismbchar(name, name+MBMAXLEN))) { Wei He: I think it's wrong */
4746 4747
    if (use_mb(system_charset_info) &&
        (l = my_ismbchar(system_charset_info, name, strend)))
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    {
	while (l--)
	    *to++ = *name++;
	name--;
	continue;
    }
#endif
    if (*name == '\\' && name[1])
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      name++;					// Skip '\\'
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    *to++= *name;
  }
  *to=0;
}

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


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


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/*
  Add a table to list of used tables

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

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

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TABLE_LIST *st_select_lex::add_table_to_list(THD *thd,
					     Table_ident *table,
4804
					     LEX_STRING *alias,
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					     ulong table_options,
					     thr_lock_type lock_type,
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					     List<String> *use_index_arg,
					     List<String> *ignore_index_arg,
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                                             LEX_STRING *option)
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{
  register TABLE_LIST *ptr;
  char *alias_str;
  DBUG_ENTER("add_table_to_list");

  if (!table)
    DBUG_RETURN(0);				// End of memory
  alias_str= alias ? alias->str : table->table.str;
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  if (check_table_name(table->table.str,table->table.length) ||
4819
      table->db.str && check_db_name(table->db.str))
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  {
4821
    net_printf(thd, ER_WRONG_TABLE_NAME, table->table.str);
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    DBUG_RETURN(0);
  }

  if (!alias)					/* Alias is case sensitive */
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  {
    if (table->sel)
    {
      net_printf(thd,ER_DERIVED_MUST_HAVE_ALIAS);
      DBUG_RETURN(0);
    }
4832
    if (!(alias_str=thd->memdup(alias_str,table->table.length+1)))
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      DBUG_RETURN(0);
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  }
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  if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
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    DBUG_RETURN(0);				/* purecov: inspected */
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  if (table->db.str)
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  {
    ptr->db= table->db.str;
    ptr->db_length= table->db.length;
  }
  else if (thd->db)
  {
    ptr->db= thd->db;
    ptr->db_length= thd->db_length;
  }
  else
  {
4849 4850
    /* The following can't be "" as we may do 'casedn_str()' on it */
    ptr->db= empty_c_string;
4851 4852
    ptr->db_length= 0;
  }
4853 4854
  if (thd->current_arena->is_stmt_prepare())
    ptr->db= thd->strdup(ptr->db);
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4856
  ptr->alias= alias_str;
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  if (lower_case_table_names && table->table.length)
    my_casedn_str(files_charset_info, table->table.str);
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  ptr->real_name=table->table.str;
4860
  ptr->real_name_length=table->table.length;
4861
  ptr->lock_type=   lock_type;
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  ptr->updating=    test(table_options & TL_OPTION_UPDATING);
  ptr->force_index= test(table_options & TL_OPTION_FORCE_INDEX);
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  ptr->ignore_leaves= test(table_options & TL_OPTION_IGNORE_LEAVES);
4865
  ptr->derived=	    table->sel;
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  ptr->cacheable_table= 1;
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  if (use_index_arg)
    ptr->use_index=(List<String> *) thd->memdup((gptr) use_index_arg,
						sizeof(*use_index_arg));
  if (ignore_index_arg)
    ptr->ignore_index=(List<String> *) thd->memdup((gptr) ignore_index_arg,
						   sizeof(*ignore_index_arg));
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  ptr->option= option ? option->str : 0;
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  /* check that used name is unique */
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  if (lock_type != TL_IGNORE)
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  {
4877
    for (TABLE_LIST *tables=(TABLE_LIST*) table_list.first ;
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	 tables ;
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	 tables=tables->next)
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    {
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      if (!my_strcasecmp(table_alias_charset, alias_str, tables->alias) &&
	  !strcmp(ptr->db, tables->db))
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      {
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	net_printf(thd,ER_NONUNIQ_TABLE,alias_str); /* purecov: tested */
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	DBUG_RETURN(0);				/* purecov: tested */
      }
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    }
  }
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  table_list.link_in_list((byte*) ptr, (byte**) &ptr->next);
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  DBUG_RETURN(ptr);
}

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/*
  Set lock for all tables in current select level

  SYNOPSIS:
    set_lock_for_tables()
    lock_type			Lock to set for tables

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

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

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

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void add_join_on(TABLE_LIST *b,Item *expr)
{
4927
  if (expr)
4928
  {
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    if (!b->on_expr)
      b->on_expr=expr;
    else
    {
      // This only happens if you have both a right and left join
      b->on_expr=new Item_cond_and(b->on_expr,expr);
    }
    b->on_expr->top_level_item();
4937
  }
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}


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/*
  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
  
  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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void add_join_natural(TABLE_LIST *a,TABLE_LIST *b)
{
  b->natural_join=a;
}

4964
/*
4965 4966 4967 4968 4969 4970 4971 4972 4973 4974 4975 4976 4977 4978 4979 4980 4981
  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
4982 4983
*/

4984 4985
bool reload_acl_and_cache(THD *thd, ulong options, TABLE_LIST *tables,
                          bool *write_to_binlog)
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{
  bool result=0;
  select_errors=0;				/* Write if more errors */
4989
  bool tmp_write_to_binlog= 1;
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  if (options & REFRESH_GRANT)
  {
4993
    acl_reload(thd);
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    grant_reload(thd);
4995
    if (mqh_used)
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      reset_mqh(thd,(LEX_USER *) NULL,TRUE);
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  }
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#endif
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  if (options & REFRESH_LOG)
  {
5001
    /*
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      Flush the normal query log, the update log, the binary log,
      the slow query log, and the relay log (if it exists).
5004
    */
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    /*
      Writing this command to the binlog may result in infinite loops when
      doing mysqlbinlog|mysql, and anyway it does not really make sense to
      log it automatically (would cause more trouble to users than it would
      help them)
5011 5012
    */
    tmp_write_to_binlog= 0;
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    mysql_log.new_file(1);
    mysql_update_log.new_file(1);
    mysql_bin_log.new_file(1);
    mysql_slow_log.new_file(1);
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#ifdef HAVE_REPLICATION
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    if (mysql_bin_log.is_open() && expire_logs_days)
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    {
      long purge_time= time(0) - expire_logs_days*24*60*60;
      if (purge_time >= 0)
5022
	mysql_bin_log.purge_logs_before_date(purge_time);
5023
    }
5024
    pthread_mutex_lock(&LOCK_active_mi);
5025
    rotate_relay_log(active_mi);
5026
    pthread_mutex_unlock(&LOCK_active_mi);
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#endif
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    if (ha_flush_logs())
      result=1;
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    if (flush_error_log())
      result=1;
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  }
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#ifdef HAVE_QUERY_CACHE
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  if (options & REFRESH_QUERY_CACHE_FREE)
  {
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    query_cache.pack();				// FLUSH QUERY CACHE
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    options &= ~REFRESH_QUERY_CACHE; //don't flush all cache, just free memory
  }
  if (options & (REFRESH_TABLES | REFRESH_QUERY_CACHE))
  {
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    query_cache.flush();			// RESET QUERY CACHE
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  }
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#endif /*HAVE_QUERY_CACHE*/
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  /*
    Note that if REFRESH_READ_LOCK bit is set then REFRESH_TABLES is set too
    (see sql_yacc.yy)
  */
  if (options & (REFRESH_TABLES | REFRESH_READ_LOCK)) 
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  {
5050
    if ((options & REFRESH_READ_LOCK) && thd)
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    {
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      /*
        We must not try to aspire a global read lock if we have a write
        locked table. This would lead to a deadlock when trying to
        reopen (and re-lock) the table after the flush.
      */
      if (thd->locked_tables)
      {
        THR_LOCK_DATA **lock_p= thd->locked_tables->locks;
        THR_LOCK_DATA **end_p= lock_p + thd->locked_tables->lock_count;

        for (; lock_p < end_p; lock_p++)
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        {
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          if ((*lock_p)->type == TL_WRITE)
          {
            my_error(ER_LOCK_OR_ACTIVE_TRANSACTION, MYF(0));
            return 1;
          }
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        }
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      }
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      /*
	Writing to the binlog could cause deadlocks, as we don't log
	UNLOCK TABLES
      */
5075
      tmp_write_to_binlog= 0;
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      if (lock_global_read_lock(thd))
	return 1;
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      result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1,
                                 tables);
      make_global_read_lock_block_commit(thd);
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    }
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    else
      result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1, tables);
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    my_dbopt_cleanup();
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  }
  if (options & REFRESH_HOSTS)
    hostname_cache_refresh();
  if (options & REFRESH_STATUS)
    refresh_status();
  if (options & REFRESH_THREADS)
    flush_thread_cache();
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#ifdef HAVE_REPLICATION
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  if (options & REFRESH_MASTER)
5094 5095
  {
    tmp_write_to_binlog= 0;
5096 5097
    if (reset_master(thd))
      result=1;
5098
  }
5099
#endif
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#ifdef OPENSSL
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   if (options & REFRESH_DES_KEY_FILE)
   {
     if (des_key_file)
       result=load_des_key_file(des_key_file);
   }
#endif
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#ifdef HAVE_REPLICATION
5108 5109
 if (options & REFRESH_SLAVE)
 {
5110
   tmp_write_to_binlog= 0;
5111
   pthread_mutex_lock(&LOCK_active_mi);
5112
   if (reset_slave(thd, active_mi))
5113
     result=1;
5114
   pthread_mutex_unlock(&LOCK_active_mi);
5115
 }
5116
#endif
5117
 if (options & REFRESH_USER_RESOURCES)
5118
   reset_mqh(thd,(LEX_USER *) NULL);
5119 5120
 if (write_to_binlog)
   *write_to_binlog= tmp_write_to_binlog;
5121
 return result;
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}

5124 5125 5126 5127 5128 5129 5130 5131 5132 5133 5134 5135
/*
  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
*/

5136
void kill_one_thread(THD *thd, ulong id)
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{
  THD *tmp;
  uint error=ER_NO_SUCH_THREAD;
5140 5141
  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For unlink from list
  I_List_iterator<THD> it(threads);
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  while ((tmp=it++))
  {
    if (tmp->thread_id == id)
    {
5146 5147
      pthread_mutex_lock(&tmp->LOCK_delete);	// Lock from delete
      break;
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    }
  }
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
5151 5152 5153 5154 5155 5156 5157 5158 5159 5160 5161 5162 5163
  if (tmp)
  {
    if ((thd->master_access & SUPER_ACL) ||
	!strcmp(thd->user,tmp->user))
    {
      tmp->awake(1 /*prepare to die*/);
      error=0;
    }
    else
      error=ER_KILL_DENIED_ERROR;
    pthread_mutex_unlock(&tmp->LOCK_delete);
  }

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  if (!error)
5165
    send_ok(thd);
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  else
5167
    net_printf(thd,error,id);
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}

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/* Clear most status variables */

static void refresh_status(void)
{
  pthread_mutex_lock(&LOCK_status);
  for (struct show_var_st *ptr=status_vars; ptr->name; ptr++)
  {
    if (ptr->type == SHOW_LONG)
5179
      *(ulong*) ptr->value= 0;
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  }
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  /* Reset the counters of all key caches (default and named). */
  process_key_caches(reset_key_cache_counters);
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  pthread_mutex_unlock(&LOCK_status);
}
5185 5186 5187 5188


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

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static bool append_file_to_dir(THD *thd, const char **filename_ptr,
			       const char *table_name)
5191
{
5192
  char buff[FN_REFLEN],*ptr, *end;
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  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))
  {
5200
    my_error(ER_WRONG_TABLE_NAME, MYF(0), *filename_ptr);
5201 5202 5203 5204
    return 1;
  }
  /* Fix is using unix filename format on dos */
  strmov(buff,*filename_ptr);
5205
  end=convert_dirname(buff, *filename_ptr, NullS);
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  if (!(ptr=thd->alloc((uint) (end-buff)+(uint) strlen(table_name)+1)))
5207 5208
    return 1;					// End of memory
  *filename_ptr=ptr;
5209
  strxmov(ptr,buff,table_name,NullS);
5210 5211
  return 0;
}
5212

5213

5214 5215 5216 5217 5218 5219 5220 5221 5222 5223 5224 5225 5226 5227
/*
  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;
5228
  if (thd->lex->current_select != &thd->lex->select_lex)
5229 5230
  {
    char command[80];
5231 5232
    strmake(command, thd->lex->yylval->symbol.str,
	    min(thd->lex->yylval->symbol.length, sizeof(command)-1));
5233
    net_printf(thd, ER_CANT_USE_OPTION_HERE, command);
5234 5235 5236 5237
    return 1;
  }
  return 0;
}
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/*
  Setup locking for multi-table updates. Used by the replication slave.
  Replication slave SQL thread examines (all_tables_not_ok()) the
  locking state of referenced tables to determine if the query has to
  be executed or ignored. Since in multi-table update, the 
  'default' lock is read-only, this lock is corrected early enough by
  calling this function, before the slave decides to execute/ignore.

  SYNOPSIS
    check_multi_update_lock()
    thd		Current thread
    tables	List of user-supplied tables
    fields	List of fields requiring update

  RETURN VALUES
    0	ok
    1	error
*/
static bool check_multi_update_lock(THD *thd, TABLE_LIST *tables, 
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				    List<Item> *fields, SELECT_LEX *select_lex)
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{
  bool res= 1;
  TABLE_LIST *table;
  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()
  */
  for (table= tables ; table ; table= table->next)
  {
    TABLE_LIST *save= table->next;
    table->next= 0;
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    if ((check_access(thd, UPDATE_ACL, table->db, &table->grant.privilege,0,1) ||
        (grant_option && check_grant(thd, UPDATE_ACL, table,0,1,1))) &&
	check_one_table_access(thd, SELECT_ACL, table))
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	goto error;
    table->next= save;
  }
    
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5282
  if (mysql_multi_update_lock(thd, tables, fields, select_lex))
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    goto error;
  
  res= 0;
  
error:
  DBUG_RETURN(res);
}
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Comp_creator *comp_eq_creator(bool invert)
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{
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5294
  return invert?(Comp_creator *)&ne_creator:(Comp_creator *)&eq_creator;
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}

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

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

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

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

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

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

  RETURN VALUE
    constructed Item (or 0 if out of memory)
*/
Item * all_any_subquery_creator(Item *left_expr,
				chooser_compare_func_creator cmp,
				bool all,
				SELECT_LEX *select_lex)
{
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  if ((cmp == &comp_eq_creator) && !all)       //  = ANY <=> IN
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    return new Item_in_subselect(left_expr, select_lex);
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  if ((cmp == &comp_ne_creator) && all)        // <> ALL <=> NOT IN
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    return new Item_func_not(new Item_in_subselect(left_expr, select_lex));

  Item_allany_subselect *it=
5353
    new Item_allany_subselect(left_expr, (*cmp)(all), select_lex, all);
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  if (all)
5355
    return it->upper_item= new Item_func_not_all(it);	/* ALL */
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5357
  return it->upper_item= new Item_func_nop_all(it);      /* ANY/SOME */
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}
5359 5360


5361 5362 5363 5364 5365 5366 5367 5368 5369 5370 5371 5372 5373 5374 5375
/*
  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.
*/

int mysql_create_index(THD *thd, TABLE_LIST *table_list, List<Key> &keys)
{
  List<create_field> fields;
5376 5377 5378
  ALTER_INFO alter_info;
  alter_info.flags= ALTER_ADD_INDEX;
  alter_info.is_simple= 0;
5379 5380 5381 5382 5383 5384 5385
  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;
  DBUG_RETURN(mysql_alter_table(thd,table_list->db,table_list->real_name,
				&create_info, table_list,
5386
				fields, keys, 0, (ORDER*)0,
5387
				DUP_ERROR, 0, &alter_info));
5388 5389 5390
}


5391
int mysql_drop_index(THD *thd, TABLE_LIST *table_list, ALTER_INFO *alter_info)
5392 5393 5394 5395 5396 5397 5398 5399
{
  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;
5400 5401 5402
  alter_info->clear();
  alter_info->flags= ALTER_DROP_INDEX;
  alter_info->is_simple= 0;
5403 5404
  DBUG_RETURN(mysql_alter_table(thd,table_list->db,table_list->real_name,
				&create_info, table_list,
5405
				fields, keys, 0, (ORDER*)0,
5406
				DUP_ERROR, 0, alter_info));
5407
}
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5410 5411 5412 5413 5414
/*
  Multi update query pre-check

  SYNOPSIS
    multi_update_precheck()
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    thd		Thread handler
    tables	Global table list
5417

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  RETURN VALUE
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    0   OK
    1   Error (message is sent to user)
    -1  Error (message is not sent to user)
5422
*/
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int multi_update_precheck(THD *thd, TABLE_LIST *tables)
{
  DBUG_ENTER("multi_update_precheck");
  const char *msg= 0;
  TABLE_LIST *table;
  LEX *lex= thd->lex;
  SELECT_LEX *select_lex= &lex->select_lex;
  TABLE_LIST *update_list= (TABLE_LIST*)select_lex->table_list.first;

  if (select_lex->item_list.elements != lex->value_list.elements)
  {
    my_error(ER_WRONG_VALUE_COUNT, MYF(0));
    DBUG_RETURN(-1);
  }
  /*
    Ensure that we have UPDATE or SELECT privilege for each table
    The exact privilege is checked in mysql_multi_update()
  */
  for (table= update_list; table; table= table->next)
  {
5444 5445 5446 5447 5448 5449
    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)) &&
5450 5451
	(check_access(thd, SELECT_ACL, table->db,
		      &table->grant.privilege, 0, 0) ||
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	 grant_option && check_grant(thd, SELECT_ACL, table, 0, 1, 0)))
5453
      DBUG_RETURN(1);
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    /*
      We assign following flag only to copy of table, because it will
      be checked only if query contains subqueries i.e. only if copy exists
    */
5459
    if (table->table_list)
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      table->table_list->table_in_update_from_clause= 1;
5461
  }
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  /*
    Is there tables of subqueries?
  */
5465
  if (&lex->select_lex != lex->all_selects_list || lex->time_zone_tables_used)
5466
  {
5467
    DBUG_PRINT("info",("Checking sub query list"));
5468 5469
    for (table= tables; table; table= table->next)
    {
5470 5471 5472 5473
      if (my_tz_check_n_skip_implicit_tables(&table,
                                             lex->time_zone_tables_used))
        continue;
      else if (table->table_in_update_from_clause)
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      {
	/*
	  If we check table by local TABLE_LIST copy then we should copy
	  grants to global table list, because it will be used for table
	  opening.
	*/
	if (table->table_list)
	  table->grant= table->table_list->grant;
      }
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      else if (!table->derived)
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      {
	if (check_access(thd, SELECT_ACL, table->db,
			 &table->grant.privilege, 0, 0) ||
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	    grant_option && check_grant(thd, SELECT_ACL, table, 0, 1, 0))
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	  DBUG_RETURN(1);
      }
    }
  }

  if (select_lex->order_list.elements)
    msg= "ORDER BY";
  else if (select_lex->select_limit && select_lex->select_limit !=
	   HA_POS_ERROR)
    msg= "LIMIT";
  if (msg)
  {
    my_error(ER_WRONG_USAGE, MYF(0), "UPDATE", msg);
    DBUG_RETURN(-1);
  }
  DBUG_RETURN(0);
}

/*
  Multi delete query pre-check

  SYNOPSIS
    multi_delete_precheck()
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    thd			Thread handler
    tables		Global table list
    table_count		Pointer to table counter
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  RETURN VALUE
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    0   OK
    1   error (message is sent to user)
    -1  error (message is not sent to user)
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*/
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int multi_delete_precheck(THD *thd, TABLE_LIST *tables, uint *table_count)
{
  DBUG_ENTER("multi_delete_precheck");
  SELECT_LEX *select_lex= &thd->lex->select_lex;
  TABLE_LIST *aux_tables=
    (TABLE_LIST *)thd->lex->auxilliary_table_list.first;
  TABLE_LIST *delete_tables= (TABLE_LIST *)select_lex->table_list.first;
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  TABLE_LIST *target_tbl;

  *table_count= 0;
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  /* sql_yacc guarantees that tables and aux_tables are not zero */
  DBUG_ASSERT(aux_tables != 0);
  if (check_db_used(thd, tables) || check_db_used(thd,aux_tables) ||
      check_table_access(thd,SELECT_ACL, tables,0) ||
      check_table_access(thd,DELETE_ACL, aux_tables,0))
    DBUG_RETURN(1);
  if ((thd->options & OPTION_SAFE_UPDATES) && !select_lex->where)
  {
    my_error(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE, MYF(0));
    DBUG_RETURN(-1);
  }
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  for (target_tbl= aux_tables; target_tbl; target_tbl= target_tbl->next)
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  {
    (*table_count)++;
    /* All tables in aux_tables must be found in FROM PART */
    TABLE_LIST *walk;
    for (walk= delete_tables; walk; walk= walk->next)
    {
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      if (!my_strcasecmp(table_alias_charset,
			 target_tbl->alias, walk->alias) &&
	  !strcmp(walk->db, target_tbl->db))
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	break;
    }
    if (!walk)
    {
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      my_error(ER_UNKNOWN_TABLE, MYF(0), target_tbl->real_name,
	       "MULTI DELETE");
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      DBUG_RETURN(-1);
    }
    if (walk->derived)
    {
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      my_error(ER_NON_UPDATABLE_TABLE, MYF(0), target_tbl->real_name,
	       "DELETE");
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      DBUG_RETURN(-1);
    }
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    walk->lock_type= target_tbl->lock_type;
    target_tbl->table_list= walk;	// Remember corresponding table
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    /* in case of subselects, we need to set lock_type in
     * corresponding table in list of all tables */
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    if (walk->table_list)
    {
      target_tbl->table_list= walk->table_list;
      walk->table_list->lock_type= walk->lock_type;
    }
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  }
  DBUG_RETURN(0);
}


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/*
  simple UPDATE query pre-check

  SYNOPSIS
    update_precheck()
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    thd		Thread handler
    tables	Global table list
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  RETURN VALUE
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    0   OK
    1   Error (message is sent to user)
    -1  Error (message is not sent to user)
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*/
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int update_precheck(THD *thd, TABLE_LIST *tables)
{
  DBUG_ENTER("update_precheck");
  if (thd->lex->select_lex.item_list.elements != thd->lex->value_list.elements)
  {
    my_error(ER_WRONG_VALUE_COUNT, MYF(0));
    DBUG_RETURN(-1);
  }
  DBUG_RETURN((check_db_used(thd, tables) ||
	       check_one_table_access(thd, UPDATE_ACL, tables)) ? 1 : 0);
}


/*
  simple DELETE query pre-check

  SYNOPSIS
    delete_precheck()
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    thd		Thread handler
    tables	Global table list
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  RETURN VALUE
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    0   OK
    1   error (message is sent to user)
    -1  error (message is not sent to user)
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*/
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int delete_precheck(THD *thd, TABLE_LIST *tables)
{
  DBUG_ENTER("delete_precheck");
  if (check_one_table_access(thd, DELETE_ACL, tables))
    DBUG_RETURN(1);
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  /* Set privilege for the WHERE clause */
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  tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
  DBUG_RETURN(0);
}


/*
  simple INSERT query pre-check

  SYNOPSIS
    insert_precheck()
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    thd		Thread handler
    tables	Global table list
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  RETURN VALUE
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    0   OK
    1   error (message is sent to user)
    -1  error (message is not sent to user)
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*/
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int insert_precheck(THD *thd, TABLE_LIST *tables)
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{
  LEX *lex= thd->lex;
  DBUG_ENTER("insert_precheck");

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  /*
    Check that we have modify privileges for the first table and
    select privileges for the rest
  */
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  ulong privilege= INSERT_ACL |
                   (lex->duplicates == DUP_REPLACE ? DELETE_ACL : 0) |
                   (lex->duplicates == DUP_UPDATE ? UPDATE_ACL : 0);
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  if (check_one_table_access(thd, privilege, tables))
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    DBUG_RETURN(1);
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  if (lex->update_list.elements != lex->value_list.elements)
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  {
    my_error(ER_WRONG_VALUE_COUNT, MYF(0));
    DBUG_RETURN(-1);
  }
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  DBUG_RETURN(0);
}
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/*
  CREATE TABLE query pre-check

  SYNOPSIS
    create_table_precheck()
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    thd			Thread handler
    tables		Global table list
    create_table	Table which will be created
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  RETURN VALUE
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    0   OK
    1   Error (message is sent to user)
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*/
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int create_table_precheck(THD *thd, TABLE_LIST *tables,
			  TABLE_LIST *create_table)
{
  LEX *lex= thd->lex;
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  SELECT_LEX *select_lex= &lex->select_lex;
  ulong want_priv;
  int error= 1;                                 // Error message is given
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  DBUG_ENTER("create_table_precheck");
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  want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
              CREATE_TMP_ACL : CREATE_ACL);
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  lex->create_info.alias= create_table->alias;
  if (check_access(thd, want_priv, create_table->db,
		   &create_table->grant.privilege, 0, 0) ||
      check_merge_table_access(thd, create_table->db,
			       (TABLE_LIST *)
			       lex->create_info.merge_list.first))
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    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 */

    /*
      For temporary tables or PREPARED STATEMETNS we don't have to check
      if the created table exists
    */
    if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
        ! thd->current_arena->is_stmt_prepare() &&
        find_real_table_in_list(tables, create_table->db,
                                create_table->real_name))
    {
      net_printf(thd,ER_UPDATE_TABLE_USED, create_table->real_name);

      goto err;
    }
    if (lex->create_info.used_fields & HA_CREATE_USED_UNION)
    {
      TABLE_LIST *tab;
      for (tab= tables; tab; tab= tab->next)
      {
        if (find_real_table_in_list((TABLE_LIST*) lex->create_info.
                                    merge_list.first,
                                    tables->db, tab->real_name))
        {
          net_printf(thd, ER_UPDATE_TABLE_USED, tab->real_name);
          goto err;
        }
      }  
    }    

    if (tables && check_table_access(thd, SELECT_ACL, tables,0))
      goto err;
  }
  error= 0;

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

  SYNOPSIS
    negate_expression()
    thd  therad handler
    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);
}