sql_parse.cc 155 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"
#include "sql_acl.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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#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 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",
  "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", "Prepare Execute", "Long Data", "Close stmt",
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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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{
  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);
  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;
      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;
    uc->host=uc->user + uc->user_len +  1;
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    uc->len = temp_len;
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    uc->connections = 1;
    uc->questions=uc->updates=uc->conn_per_hour=0;
    uc->user_resources=*mqh;
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    if (max_user_connections && mqh->connections > max_user_connections)
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      uc->user_resources.connections = max_user_connections;
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    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;
      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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  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",
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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
*/

char  uc_update_queries[SQLCOM_END];

void init_update_queries(void)
{
  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)
{
  return uc_update_queries[command];
}
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/*
  Check if maximum queries per hour limit has been reached
  returns 0 if OK.
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  In theory we would need a mutex in the USER_CONN structure for this to
  be 100 % safe, but as the worst scenario is that we would miss counting
  a couple of queries, this isn't critical.
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*/

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static bool check_mqh(THD *thd, uint check_command)
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{
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#ifdef NO_EMBEDDED_ACCESS_CHECKS
  return(0);
#else
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  bool error=0;
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  time_t check_time = thd->start_time ?  thd->start_time : time(NULL);
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  USER_CONN *uc=thd->user_connect;
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  DBUG_ENTER("check_mqh");
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  DBUG_ASSERT(uc != 0);
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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)
  {
    (void) pthread_mutex_lock(&LOCK_user_conn);
    uc->questions=1;
    uc->updates=0;
    uc->conn_per_hour=0;
    uc->intime=check_time;
    (void) pthread_mutex_unlock(&LOCK_user_conn);
  }
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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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  DBUG_RETURN(error);
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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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  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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#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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    bzero((char*) &thd->remote, sizeof(struct sockaddr));
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  }
  vio_keepalive(net->vio, TRUE);
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  ulong pkt_len= 0;
  char *end;
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  {
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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
      - 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 (!(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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  /* 
    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'.
  */
  uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ? 
    *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),
                             thd->charset())]= 0;
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    db= db_buff;
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  }
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  if (user)
  {
    user_buff[copy_and_convert(user_buff, sizeof(user_buff)-1,
			       system_charset_info, user, strlen(user),
			       thd->charset())]= '\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
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      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
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    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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    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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    }

    thd->proc_info=0;
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    thd->set_time();
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    thd->init_for_queries();
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    while (!net->error && net->vio != 0 && !thd->killed)
    {
      if (do_command(thd))
	break;
    }
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    if (thd->user_connect)
      decrease_user_connections(thd->user_connect);
1021
    free_root(&thd->mem_root,MYF(0));
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    if (net->error && net->vio != 0 && net->report_error)
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    {
1024
      if (!thd->killed && thd->variables.log_warnings > 1)
1025 1026 1027 1028 1029 1030
	sql_print_error(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)));
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      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);
    }
1038
    
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end_thread:
1040
    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 */

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/*
  Execute commands from bootstrap_file.
  Used when creating the initial grant tables
*/
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1059
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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  /* The following must be called before DBUG_ENTER */
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  if (my_thread_init() || thd->store_globals())
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  {
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#ifndef EMBEDDED_LIBRARY
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    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
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#endif
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    thd->fatal_error();
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    goto end;
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  }
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  DBUG_ENTER("handle_bootstrap");

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#ifndef EMBEDDED_LIBRARY
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  pthread_detach_this_thread();
  thd->thread_stack= (char*) &thd;
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#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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1093
  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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    uint length=(uint) strlen(buff);
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    if (buff[length-1]!='\n' && !feof(file))
    {
      send_error(thd,ER_NET_PACKET_TOO_LARGE, NullS);
      thd->is_fatal_error= 1;
      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
      free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
      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)
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      break;
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    free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
1124
    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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}

1140
    /* This works because items are allocated with sql_alloc() */
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1142
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;
1163
  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;
  }
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  if (lower_case_table_names)
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    my_casedn_str(files_charset_info, tbl_name);
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  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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}


1202
#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.
1247
    }
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    send_error(thd,net->last_errno,NullS);
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    net->error= 0;
1250
    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));
1273
}
1274
#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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  /*
    Commands which will always take a long time should be marked with
    this so that they will not get logged to the slow query log
  */
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  thd->slow_command=FALSE;
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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:
  {
1330
    if (!register_slave(thd, (uchar*)packet, packet_length))
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      send_ok(thd);
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    break;
  }
1334
#endif
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  case COM_TABLE_DUMP:
1336 1337 1338 1339 1340 1341
  {
    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->slow_command= TRUE;
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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;
    }
1375
#endif
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    /* Convert database name to utf8 */
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    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
                             system_charset_info, db, strlen(db),
                             thd->charset())]= 0;
    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:
  {
1433
    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:
  {
1453 1454
    if (alloc_query(thd, packet, packet_length))
      break;					// fatal error is set
1455
    mysql_log.write(thd,command,"%s",thd->query);
1456
    DBUG_PRINT("query",("%-.4096s",thd->query));
1457
    mysql_parse(thd,thd->query, thd->query_length);
1458

1459
    while (!thd->killed && !thd->is_fatal_error && thd->lex->found_colon)
1460
    {
1461
      char *packet= thd->lex->found_colon;
1462
      /*
1463
        Multiple queries exits, execute them individually
1464
	in embedded server - just store them to be executed later 
1465
      */
1466
#ifndef EMBEDDED_LIBRARY
1467
      if (thd->lock || thd->open_tables || thd->derived_tables)
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        close_thread_tables(thd);
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#endif
      ulong length= thd->query_length-(ulong)(packet-thd->query);
1471

1472
      /* 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));
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      thd->query_length= length;
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      thd->query= packet;
      thd->query_id= query_id++;
1482
      /* TODO: set thd->lex->sql_command to SQLCOM_END here */
1483
      VOID(pthread_mutex_unlock(&LOCK_thread_count));
1484
#ifndef EMBEDDED_LIBRARY
1485
      mysql_parse(thd, packet, length);
1486
#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
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	thd->query_rest.copy(packet, length, thd->query_rest.charset());
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      break;
#endif /*EMBEDDED_LIBRARY*/
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    }

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    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),WAIT_PRIOR);
    DBUG_PRINT("info",("query ready"));
    break;
  }
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  case COM_FIELD_LIST:				// This isn't actually needed
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#ifdef DONT_ALLOW_SHOW_COMMANDS
1509
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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    break;
#else
  {
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    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))
    {
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      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;
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    packet= pend+1;
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    // command not cachable => no gap for data base name
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    if (!(thd->query=fields=thd->memdup(packet,thd->query_length+1)))
      break;
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    mysql_log.write(thd,command,"%s %s",table_list.real_name,fields);
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    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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    break;
  }
#endif
  case COM_QUIT:
1550
    /* We don't calculate statistics for this command */
1551
    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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      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))
1563
      {
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	net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
1565 1566
	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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      mysql_create_db(thd,(lower_case_table_names == 2 ? alias : db),0,0);
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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))
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      {
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	net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
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	break;
      }
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      if (check_access(thd,DROP_ACL,db,0,1,0))
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	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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      mysql_rm_db(thd, (lower_case_table_names == 2 ? alias : db), 0, 0);
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      break;
    }
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#ifndef EMBEDDED_LIBRARY
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  case COM_BINLOG_DUMP:
    {
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      statistic_increment(com_other,&LOCK_status);
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      thd->slow_command = TRUE;
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      if (check_global_access(thd, REPL_SLAVE_ACL))
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	break;
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      mysql_log.write(thd,command, 0);
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      ulong pos;
      ushort flags;
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      uint32 slave_server_id;
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      /* TODO: The following has to be changed to an 8 byte integer */
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      pos = uint4korr(packet);
      flags = uint2korr(packet + 4);
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      thd->server_id=0; /* avoid suicide */
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      if ((slave_server_id= uint4korr(packet+6))) // mysqlbinlog.server_id==0
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	kill_zombie_dump_threads(slave_server_id);
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      thd->server_id = slave_server_id;
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      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;
    }
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#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;
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      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;
    }
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#ifndef EMBEDDED_LIBRARY
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  case COM_SHUTDOWN:
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  {
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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 */
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    /*
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      If the client is < 4.1.3, it is going to send us no argument; then
      packet_length is 1, packet[0] is the end 0 of the packet. Note that
      SHUTDOWN_DEFAULT is 0. If client is >= 4.1.3, the shutdown level is in
      packet[0].
1645
    */
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    enum mysql_enum_shutdown_level level=
      (enum mysql_enum_shutdown_level) (uchar) packet[0];
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    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;
    }
1657
    DBUG_PRINT("quit",("Got shutdown command for level %u", level));
1658
    mysql_log.write(thd,command,NullS);
1659
    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
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    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;
1673
  }
1674
#endif
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  case COM_STATISTICS:
  {
1677
    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
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    ulong uptime = (ulong) (thd->start_time - start_time);
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    sprintf((char*) buff,
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	    "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
1692
    if (sf_malloc_cur_memory)				// Using SAFEMALLOC
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      sprintf(strend(buff), "  Memory in use: %ldK  Max memory used: %ldK",
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	      (sf_malloc_cur_memory+1023L)/1024L,
	      (sf_malloc_max_memory+1023L)/1024L);
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#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);
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    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;
1711
    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);
1719
    ulong id=(ulong) uint4korr(packet);
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    kill_one_thread(thd,id);
    break;
  }
1723 1724 1725 1726 1727 1728 1729
  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);
1731 1732 1733
      break;
    case MYSQL_OPTION_MULTI_STATEMENTS_OFF:
      thd->client_capabilities&= ~CLIENT_MULTI_STATEMENTS;
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      send_eof(thd);
1735 1736 1737 1738 1739 1740 1741
      break;
    default:
      send_error(thd, ER_UNKNOWN_COM_ERROR);
      break;
    }
    break;
  }
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  case COM_DEBUG:
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    statistic_increment(com_other,&LOCK_status);
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    if (check_global_access(thd, SUPER_ACL))
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      break;					/* purecov: inspected */
    mysql_print_status(thd);
1747
    mysql_log.write(thd,command,NullS);
1748
    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:
1754
  case COM_END:
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  default:
1756
    send_error(thd, ER_UNKNOWN_COM_ERROR);
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    break;
  }
1759
  if (thd->lock || thd->open_tables || thd->derived_tables)
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  {
    thd->proc_info="closing tables";
    close_thread_tables(thd);			/* Free tables */
  }

1765
  if (thd->is_fatal_error)
1766
    send_error(thd,0);				// End of memory ?
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  time_t start_of_query=thd->start_time;
1769
  thd->end_time();				// Set start time
1770

1771
  /* If not reading from backup and if the query took too long */
1772
  if (!thd->slow_command && !thd->user_time) // do not log 'slow_command' queries
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  {
1774 1775
    thd->proc_info="logging slow query";

1776 1777
    if ((ulong) (thd->start_time - thd->time_after_lock) >
	thd->variables.long_query_time ||
1778 1779
	((thd->server_status &
	  (SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED)) &&
1780
	 (specialflag & SPECIAL_LOG_QUERIES_NOT_USING_INDEXES)))
1781 1782 1783 1784
    {
      long_query_count++;
      mysql_slow_log.write(thd, thd->query, thd->query_length, start_of_query);
    }
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  }
1786
  thd->proc_info="cleaning up";
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  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For process list
  thd->proc_info=0;
  thd->command=COM_SLEEP;
  thd->query=0;
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  thd->query_length=0;
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  thread_running--;
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
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  thd->packet.shrink(thd->variables.net_buffer_length);	// Reclaim some memory
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  free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
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  DBUG_RETURN(error);
}

1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816

/*
  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
1817
  /* Remove garbage at start and end of query */
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  while (my_isspace(thd->charset(),packet[0]) && packet_length > 0)
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  {
    packet++;
    packet_length--;
  }
  char *pos=packet+packet_length;		// Point at end null
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  while (packet_length > 0 &&
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	 (pos[-1] == ';' || my_isspace(thd->charset() ,pos[-1])))
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  {
    pos--;
    packet_length--;
  }
  /* We must allocate some extra memory for query cache */
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  thd->query_length= 0;                        // Extra safety: Avoid races
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  if (!(thd->query= (char*) thd->memdup_w_gap((gptr) (packet),
					      packet_length,
1834 1835
					      thd->db_length+ 1 +
					      QUERY_CACHE_FLAGS_SIZE)))
1836 1837 1838
    return 1;
  thd->query[packet_length]=0;
  thd->query_length= packet_length;
1839 1840 1841 1842

  /* Reclaim some memory */
  thd->packet.shrink(thd->variables.net_buffer_length);
  thd->convert_buffer.shrink(thd->variables.net_buffer_length);
1843 1844 1845 1846 1847 1848

  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
1855
mysql_execute_command(THD *thd)
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{
1857
  int	res= 0;
1858
  LEX	*lex= thd->lex;
1859
  TABLE_LIST *tables= (TABLE_LIST*) lex->select_lex.table_list.first;
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  SELECT_LEX *select_lex= &lex->select_lex;
1861
  SELECT_LEX_UNIT *unit= &lex->unit;
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  DBUG_ENTER("mysql_execute_command");

1864 1865 1866 1867 1868 1869
  /*
    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.
  */
1870
  if (tables || &lex->select_lex != lex->all_selects_list)
1871 1872
    mysql_reset_errors(thd);

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#ifdef HAVE_REPLICATION
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  if (thd->slave_thread)
  {
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    /*
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      Skip if we are in the slave thread, some table rules have been
      given and the table list says the query should not be replicated
    */
1880
    if (all_tables_not_ok(thd,tables))
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    {
      /* we warn the slave SQL thread */
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
1884
      DBUG_VOID_RETURN;
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    }
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#ifndef TO_BE_DELETED
    /*
1888 1889 1890
      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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    */
1892 1893 1894
    if (lex->sql_command == SQLCOM_SELECT)
    {
      lex->sql_command = SQLCOM_DO;
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      lex->insert_list = &select_lex->item_list;
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    }
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#endif
1898
  }
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#endif /* !HAVE_REPLICATION */
1900 1901
  if ((&lex->select_lex != lex->all_selects_list ||
       lex->time_zone_tables_used) &&
1902
      lex->unit.create_total_list(thd, lex, &tables))
1903
    DBUG_VOID_RETURN;
1904

1905 1906 1907 1908 1909
  /*
    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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      !(thd->slave_thread || (thd->master_access & SUPER_ACL)) &&
1911 1912
      (uc_update_queries[lex->sql_command] > 0))
  {
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    net_printf(thd, ER_OPTION_PREVENTS_STATEMENT, "--read-only");
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    DBUG_VOID_RETURN;
  }
1916

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  statistic_increment(com_stat[lex->sql_command],&LOCK_status);
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  switch (lex->sql_command) {
  case SQLCOM_SELECT:
  {
1921 1922 1923 1924 1925 1926 1927
    /* 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;
    }

1928
    select_result *result=lex->result;
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    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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    }
    else
      res=check_access(thd, lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL,
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		       any_db,0,0,0);
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    if (res)
    {
      res=0;
      break;					// Error message is given
    }
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    /* 
       In case of single SELECT unit->global_parameters points on first SELECT
       TODO: move counters to SELECT_LEX
    */
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    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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    if (unit->select_limit_cnt <
1952
	(ha_rows) unit->global_parameters->select_limit)
1953
      unit->select_limit_cnt= HA_POS_ERROR;		// no limit
1954
    if (unit->select_limit_cnt == HA_POS_ERROR && !select_lex->next_select())
1955
      select_lex->options&= ~OPTION_FOUND_ROWS;
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    if (!(res=open_and_lock_tables(thd,tables)))
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    {
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      if (lex->describe)
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      {
1961 1962 1963 1964 1965 1966 1967
	if (!(result= new select_send()))
	{
	  send_error(thd, ER_OUT_OF_RESOURCES);
	  DBUG_VOID_RETURN;
	}
	else
	  thd->send_explain_fields(result);
1968
	res= mysql_explain_union(thd, &thd->lex->unit, result);
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	MYSQL_LOCK *save_lock= thd->lock;
	thd->lock= (MYSQL_LOCK *)0;
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	if (lex->describe & DESCRIBE_EXTENDED)
	{
	  char buff[1024];
	  String str(buff,(uint32) sizeof(buff), system_charset_info);
	  str.length(0);
1976
	  thd->lex->unit.print(&str);
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1977 1978 1979 1980
	  str.append('\0');
	  push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
		       ER_YES, str.ptr());
	}
1981
	result->send_eof();
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1982 1983 1984 1985
	thd->lock= save_lock;
      }
      else
      {
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1986 1987
	if (!result)
	{
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1988
	  if (!(result=new select_send()))
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1989 1990 1991 1992 1993
	  {
	    res= -1;
	    break;
	  }
	}
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1994 1995 1996
	query_cache_store_query(thd, tables);
	res=handle_select(thd, lex, result);
      }
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1997
    }
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1998 1999
    break;
  }
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2000
  case SQLCOM_PREPARE:
2001
  {
2002 2003 2004 2005
    char *query_str;
    uint query_len;
    if (lex->prepared_stmt_code_is_varref)
    {
2006
      /* This is PREPARE stmt FROM @var. */
2007 2008 2009 2010 2011
      String str;
      CHARSET_INFO *to_cs= thd->variables.collation_connection;
      bool need_conversion;
      user_var_entry *entry;
      uint32 unused;
2012
      /*
2013 2014 2015
        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.
2016
      */
2017 2018
      if ((entry=
             (user_var_entry*)hash_search(&thd->user_vars,
2019 2020 2021 2022
                                          (byte*)lex->prepared_stmt_code.str,
                                          lex->prepared_stmt_code.length))
          && entry->value)
      {
2023 2024 2025 2026 2027 2028 2029
        String *pstr;
        my_bool is_var_null;
        pstr= entry->val_str(&is_var_null, &str, NOT_FIXED_DEC);
        DBUG_ASSERT(!is_var_null);
        if (!pstr)
          send_error(thd, ER_OUT_OF_RESOURCES);
        DBUG_ASSERT(pstr == &str);
2030 2031
      }
      else
2032 2033 2034 2035 2036 2037
        str.set("NULL", 4, &my_charset_latin1);
      need_conversion=
        String::needs_conversion(str.length(), str.charset(), to_cs, &unused);

      query_len= need_conversion? (str.length() * to_cs->mbmaxlen) :
                                  str.length();
2038 2039
      if (!(query_str= alloc_root(&thd->mem_root, query_len+1)))
        send_error(thd, ER_OUT_OF_RESOURCES);
2040

2041
      if (need_conversion)
2042 2043
        query_len= copy_and_convert(query_str, query_len, to_cs, str.ptr(),
                                    str.length(), str.charset());
2044
      else
2045
        memcpy(query_str, str.ptr(), str.length());
2046
      query_str[query_len]= 0;
2047 2048 2049
    }
    else
    {
2050 2051
      query_str= lex->prepared_stmt_code.str;
      query_len= lex->prepared_stmt_code.length;
2052
      DBUG_PRINT("info", ("PREPARE: %.*s FROM '%.*s' \n",
2053 2054
                          lex->prepared_stmt_name.length,
                          lex->prepared_stmt_name.str,
2055
                          query_len, query_str));
2056
    }
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2057
    thd->command= COM_PREPARE;
2058 2059
    if (!mysql_stmt_prepare(thd, query_str, query_len + 1,
                            &lex->prepared_stmt_name))
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2060 2061 2062 2063 2064
      send_ok(thd, 0L, 0L, "Statement prepared");
    break;
  }
  case SQLCOM_EXECUTE:
  {
2065
    DBUG_PRINT("info", ("EXECUTE: %.*s\n",
2066 2067 2068
                        lex->prepared_stmt_name.length,
                        lex->prepared_stmt_name.str));
    mysql_sql_stmt_execute(thd, &lex->prepared_stmt_name);
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2069 2070 2071 2072 2073
    lex->prepared_stmt_params.empty();
    break;
  }
  case SQLCOM_DEALLOCATE_PREPARE:
  {
2074 2075 2076 2077 2078
    Statement* stmt;
    DBUG_PRINT("info", ("DEALLOCATE PREPARE: %.*s\n", 
                        lex->prepared_stmt_name.length,
                        lex->prepared_stmt_name.str));
    if ((stmt= thd->stmt_map.find_by_name(&lex->prepared_stmt_name)))
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2079
    {
2080 2081
      thd->stmt_map.erase(stmt);
      send_ok(thd);
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2082
    }
2083
    else
2084 2085 2086 2087 2088 2089
    {
      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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2090 2091
    break;
  }
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2092
  case SQLCOM_DO:
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2093
    if (tables && ((res= check_table_access(thd, SELECT_ACL, tables,0)) ||
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2094 2095 2096 2097 2098 2099
		   (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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2100 2101
    break;

2102
  case SQLCOM_EMPTY_QUERY:
2103
    send_ok(thd);
2104 2105
    break;

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2106 2107 2108 2109
  case SQLCOM_HELP:
    res= mysqld_help(thd,lex->help_arg);
    break;

2110
#ifndef EMBEDDED_LIBRARY
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2111
  case SQLCOM_PURGE:
2112
  {
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2113
    if (check_global_access(thd, SUPER_ACL))
2114
      goto error;
2115
    // PURGE MASTER LOGS TO 'file'
2116 2117 2118
    res = purge_master_logs(thd, lex->to_log);
    break;
  }
2119 2120 2121 2122 2123 2124 2125 2126
  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;
  }
2127
#endif
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2128 2129
  case SQLCOM_SHOW_WARNS:
  {
2130 2131
    res= mysqld_show_warnings(thd, (ulong)
			      ((1L << (uint) MYSQL_ERROR::WARN_LEVEL_NOTE) |
2132 2133 2134
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_WARN) |
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR)
			       ));
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2135 2136 2137 2138
    break;
  }
  case SQLCOM_SHOW_ERRORS:
  {
2139 2140
    res= mysqld_show_warnings(thd, (ulong)
			      (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR));
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2141 2142
    break;
  }
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2143 2144
  case SQLCOM_SHOW_NEW_MASTER:
  {
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2145
    if (check_global_access(thd, REPL_SLAVE_ACL))
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2146
      goto error;
2147
    /* This query don't work now. See comment in repl_failsafe.cc */
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2148
#ifndef WORKING_NEW_MASTER
2149
    net_printf(thd, ER_NOT_SUPPORTED_YET, "SHOW NEW MASTER");
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2150 2151
    res= 1;
#else
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2152
    res = show_new_master(thd);
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2153
#endif
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2154 2155
    break;
  }
2156

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2157
#ifdef HAVE_REPLICATION
2158 2159
  case SQLCOM_SHOW_SLAVE_HOSTS:
  {
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2160
    if (check_global_access(thd, REPL_SLAVE_ACL))
2161 2162 2163 2164
      goto error;
    res = show_slave_hosts(thd);
    break;
  }
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2165 2166
  case SQLCOM_SHOW_BINLOG_EVENTS:
  {
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2167
    if (check_global_access(thd, REPL_SLAVE_ACL))
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2168 2169 2170 2171
      goto error;
    res = show_binlog_events(thd);
    break;
  }
2172 2173
#endif

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2174
  case SQLCOM_BACKUP_TABLE:
2175 2176
  {
    if (check_db_used(thd,tables) ||
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2177
	check_table_access(thd,SELECT_ACL, tables,0) ||
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2178
	check_global_access(thd, FILE_ACL))
2179
      goto error; /* purecov: inspected */
2180
    thd->slow_command=TRUE;
2181
    res = mysql_backup_table(thd, tables);
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2182

2183 2184
    break;
  }
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2185
  case SQLCOM_RESTORE_TABLE:
2186 2187
  {
    if (check_db_used(thd,tables) ||
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2188
	check_table_access(thd, INSERT_ACL, tables,0) ||
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2189
	check_global_access(thd, FILE_ACL))
2190
      goto error; /* purecov: inspected */
2191
    thd->slow_command=TRUE;
2192 2193 2194
    res = mysql_restore_table(thd, tables);
    break;
  }
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2195 2196 2197
  case SQLCOM_ASSIGN_TO_KEYCACHE:
  {
    if (check_db_used(thd, tables) ||
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2198 2199
        check_access(thd, INDEX_ACL, tables->db,
                     &tables->grant.privilege, 0, 0))
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2200
      goto error;
2201
    res= mysql_assign_to_keycache(thd, tables, &lex->name_and_length);
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2202 2203
    break;
  }
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2204 2205 2206
  case SQLCOM_PRELOAD_KEYS:
  {
    if (check_db_used(thd, tables) ||
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2207 2208
	check_access(thd, INDEX_ACL, tables->db,
                     &tables->grant.privilege, 0, 0))
2209
      goto error;
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2210 2211 2212
    res = mysql_preload_keys(thd, tables);
    break;
  }
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2213
#ifdef HAVE_REPLICATION
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2214
  case SQLCOM_CHANGE_MASTER:
2215
  {
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2216
    if (check_global_access(thd, SUPER_ACL))
2217
      goto error;
2218
    pthread_mutex_lock(&LOCK_active_mi);
2219
    res = change_master(thd,active_mi);
2220
    pthread_mutex_unlock(&LOCK_active_mi);
2221 2222
    break;
  }
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2223
  case SQLCOM_SHOW_SLAVE_STAT:
2224
  {
2225 2226
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2227
      goto error;
2228
    pthread_mutex_lock(&LOCK_active_mi);
2229
    res = show_master_info(thd,active_mi);
2230
    pthread_mutex_unlock(&LOCK_active_mi);
2231 2232
    break;
  }
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2233
  case SQLCOM_SHOW_MASTER_STAT:
2234
  {
2235 2236
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
2237 2238 2239 2240
      goto error;
    res = show_binlog_info(thd);
    break;
  }
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2241

2242
  case SQLCOM_LOAD_MASTER_DATA: // sync with master
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2243
    if (check_global_access(thd, SUPER_ACL))
2244
      goto error;
2245 2246 2247 2248
    if (end_active_trans(thd))
      res= -1;
    else
      res = load_master_data(thd);
2249
    break;
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2250
#endif /* HAVE_REPLICATION */
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2251 2252 2253
#ifdef HAVE_INNOBASE_DB
  case SQLCOM_SHOW_INNODB_STATUS:
    {
2254
      if (check_global_access(thd, SUPER_ACL))
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2255 2256 2257 2258 2259
	goto error;
      res = innodb_show_status(thd);
      break;
    }
#endif
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2260
#ifdef HAVE_REPLICATION
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2261
  case SQLCOM_LOAD_MASTER_TABLE:
2262
  {
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2263 2264
    if (!tables->db)
      tables->db=thd->db;
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2265
    if (check_access(thd,CREATE_ACL,tables->db,&tables->grant.privilege,0,0))
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2266 2267 2268 2269
      goto error;				/* purecov: inspected */
    if (grant_option)
    {
      /* Check that the first table has CREATE privilege */
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2270
      if (check_grant(thd, CREATE_ACL, tables, 0, 1, 0))
2271
	goto error;
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2272
    }
2273
    if (strlen(tables->real_name) > NAME_LEN)
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2274
    {
2275
      net_printf(thd,ER_WRONG_TABLE_NAME, tables->real_name);
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2276 2277
      break;
    }
2278
    pthread_mutex_lock(&LOCK_active_mi);
2279 2280 2281 2282
    /*
      fetch_master_table will send the error to the client on failure.
      Give error if the table already exists.
    */
2283
    if (!fetch_master_table(thd, tables->db, tables->real_name,
2284
			    active_mi, 0, 0))
2285
    {
2286
      send_ok(thd);
2287
    }
2288
    pthread_mutex_unlock(&LOCK_active_mi);
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2289
    break;
2290
  }
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2291
#endif /* HAVE_REPLICATION */
2292

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2293
  case SQLCOM_CREATE_TABLE:
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  {
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    /* Skip first table, which is the table we are creating */
2296 2297 2298
    TABLE_LIST *create_table, *create_table_local;
    tables= lex->unlink_first_table(tables, &create_table,
				    &create_table_local);
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2299

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2300 2301 2302
    if ((res= create_table_precheck(thd, tables, create_table)))
      goto unsent_create_error;

2303 2304 2305
#ifndef HAVE_READLINK
    lex->create_info.data_file_name=lex->create_info.index_file_name=0;
#else
2306
    /* Fix names if symlinked tables */
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2307
    if (append_file_to_dir(thd, &lex->create_info.data_file_name,
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2308
			   create_table->real_name) ||
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2309
	append_file_to_dir(thd,&lex->create_info.index_file_name,
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2310
			   create_table->real_name))
2311 2312
    {
      res=-1;
2313
      goto unsent_create_error;
2314
    }
2315
#endif
2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328
    /*
      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;
    }
2329
    if (select_lex->item_list.elements)		// With select
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2330 2331 2332 2333
    {
      select_result *result;

      if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
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	  find_real_table_in_list(tables, create_table->db,
				  create_table->real_name))
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2336
      {
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2337
	net_printf(thd,ER_UPDATE_TABLE_USED, create_table->real_name);
2338
	goto create_error;
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2339
      }
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2340
      if (tables && check_table_access(thd, SELECT_ACL, tables,0))
2341
	goto create_error;			// Error message is given
2342
      select_lex->options|= SELECT_NO_UNLOCK;
2343 2344 2345 2346
      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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2347
	unit->select_limit_cnt= HA_POS_ERROR;	// No limit
2348

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2349
      if (!(res=open_and_lock_tables(thd,tables)))
2350
      {
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2351 2352 2353 2354
	res= -1;				// If error
        if ((result=new select_create(create_table->db,
                                      create_table->real_name,
				      &lex->create_info,
2355 2356 2357
                                      lex->create_list,
                                      lex->key_list,
                                      select_lex->item_list,lex->duplicates)))
2358 2359 2360 2361 2362 2363
        {
          /*
            CREATE from SELECT give its SELECT_LEX for SELECT,
            and item_list belong to SELECT
          */
          select_lex->resolve_mode= SELECT_LEX::SELECT_MODE;
2364
          res=handle_select(thd, lex, result);
2365 2366
          select_lex->resolve_mode= SELECT_LEX::NOMATTER_MODE;
        }
2367 2368 2369
	//reset for PS
	lex->create_list.empty();
	lex->key_list.empty();
2370 2371
      }
    }
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2372 2373
    else // regular create
    {
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2374
      if (lex->name)
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        res= mysql_create_like_table(thd, create_table, &lex->create_info, 
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2376 2377
                                     (Table_ident *)lex->name); 
      else
2378
      {
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2379 2380
        res= mysql_create_table(thd,create_table->db,
			         create_table->real_name, &lex->create_info,
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2381
			         lex->create_list,
2382
			         lex->key_list,0,0);
2383
      }
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2384
      if (!res)
2385
	send_ok(thd);
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2386
    }
2387

2388
    // put tables back for PS rexecuting
2389 2390
    tables= lex->link_first_table_back(tables, create_table,
				       create_table_local);
2391 2392
    break;

2393
create_error:
2394 2395 2396
    res= 1; //error reported
unsent_create_error:
    // put tables back for PS rexecuting
2397 2398
    tables= lex->link_first_table_back(tables, create_table,
				       create_table_local);
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    break;
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2400
  }
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2401
  case SQLCOM_CREATE_INDEX:
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2402
    if (check_one_table_access(thd, INDEX_ACL, tables))
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2403
      goto error; /* purecov: inspected */
2404
    thd->slow_command=TRUE;
2405 2406 2407 2408
    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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2411
#ifdef HAVE_REPLICATION
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2412
  case SQLCOM_SLAVE_START:
2413
  {
2414
    pthread_mutex_lock(&LOCK_active_mi);
2415
    start_slave(thd,active_mi,1 /* net report*/);
2416
    pthread_mutex_unlock(&LOCK_active_mi);
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2417
    break;
2418
  }
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2419
  case SQLCOM_SLAVE_STOP:
2420 2421 2422 2423 2424 2425
  /*
    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,
2426
      so it waits for the client thread because t is locked by it.
2427
    - then the client thread does SLAVE STOP.
2428 2429
      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.
2430 2431 2432 2433 2434
    To prevent that, refuse SLAVE STOP if the
    client thread has locked tables
  */
  if (thd->locked_tables || thd->active_transaction())
  {
2435
    send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
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2436
    break;
2437
  }
2438
  {
2439
    pthread_mutex_lock(&LOCK_active_mi);
2440
    stop_slave(thd,active_mi,1/* net report*/);
2441
    pthread_mutex_unlock(&LOCK_active_mi);
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2442
    break;
2443
  }
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#endif /* HAVE_REPLICATION */
2445

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  case SQLCOM_ALTER_TABLE:
#if defined(DONT_ALLOW_SHOW_COMMANDS)
2448
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
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2449 2450 2451
    break;
#else
    {
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2452
      ulong priv=0;
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2453
      if (lex->name && (!lex->name[0] || strlen(lex->name) > NAME_LEN))
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2454
      {
2455
	net_printf(thd, ER_WRONG_TABLE_NAME, lex->name);
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	res=0;
	break;
      }
2459 2460
      if (!select_lex->db)
	select_lex->db=tables->db;
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2461 2462
      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,
2464 2465 2466
				   (TABLE_LIST *)
				   lex->create_info.merge_list.first))
	goto error;				/* purecov: inspected */
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      if (grant_option)
      {
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2469
	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;
2476
	  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;
	}
      }
2483 2484
      /* 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 */
2486
      if (end_active_trans(thd))
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	res= -1;
      else
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2489
      {
2490
        thd->slow_command=TRUE;
2491
	res= mysql_alter_table(thd, select_lex->db, lex->name,
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			       &lex->create_info,
			       tables, lex->create_list,
2494
			       lex->key_list,
2495
			       select_lex->order_list.elements,
2496
                               (ORDER *) select_lex->order_list.first,
2497
			       lex->duplicates, &lex->alter_info);
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      }
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      break;
    }
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#endif /*DONT_ALLOW_SHOW_COMMANDS*/
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2502
  case SQLCOM_RENAME_TABLE:
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  {
    TABLE_LIST *table;
    if (check_db_used(thd,tables))
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      goto error;
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    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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		       &table->grant.privilege,0,0) ||
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	  check_access(thd, INSERT_ACL | CREATE_ACL, table->next->db,
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		       &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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	/*
	  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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	old_list=table[0];
	new_list=table->next[0];
	old_list.next=new_list.next=0;
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	if (check_grant(thd, ALTER_ACL, &old_list, 0, UINT_MAX, 0) ||
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	    (!test_all_bits(table->next->grant.privilege,
2526
			    INSERT_ACL | CREATE_ACL) &&
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	     check_grant(thd, INSERT_ACL | CREATE_ACL, &new_list, 0,
			 UINT_MAX, 0)))
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	  goto error;
      }
    }
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    query_cache_invalidate3(thd, tables, 0);
2533 2534 2535
    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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  }
2539
#ifndef EMBEDDED_LIBRARY
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  case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2542
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
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    DBUG_VOID_RETURN;
#else
    {
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      if (check_global_access(thd, SUPER_ACL))
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	goto error;
      res = show_binlogs(thd);
      break;
    }
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#endif
2552
#endif /* EMBEDDED_LIBRARY */
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  case SQLCOM_SHOW_CREATE:
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#ifdef DONT_ALLOW_SHOW_COMMANDS
2555
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
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    DBUG_VOID_RETURN;
#else
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    {
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      if (check_db_used(thd, tables) ||
	  check_access(thd, SELECT_ACL | EXTRA_ACL, tables->db,
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		       &tables->grant.privilege,0,0))
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	goto error;
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      res = mysqld_show_create(thd, tables);
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      break;
    }
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#endif
2567 2568 2569
  case SQLCOM_CHECKSUM:
  {
    if (check_db_used(thd,tables) ||
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	check_table_access(thd, SELECT_ACL | EXTRA_ACL , tables,0))
2571
      goto error; /* purecov: inspected */
2572
    res = mysql_checksum_table(thd, tables, &lex->check_opt);
2573 2574
    break;
  }
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  case SQLCOM_REPAIR:
2576 2577
  {
    if (check_db_used(thd,tables) ||
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	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables,0))
2579
      goto error; /* purecov: inspected */
2580
    thd->slow_command=TRUE;
2581
    res = mysql_repair_table(thd, tables, &lex->check_opt);
2582 2583 2584 2585 2586 2587 2588 2589 2590 2591
    /* ! 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())
      {
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
        mysql_bin_log.write(&qinfo);
      }
    }
2592 2593
    break;
  }
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2594
  case SQLCOM_CHECK:
2595 2596
  {
    if (check_db_used(thd,tables) ||
2597
	check_table_access(thd, SELECT_ACL | EXTRA_ACL , tables,0))
2598
      goto error; /* purecov: inspected */
2599
    thd->slow_command=TRUE;
2600 2601 2602
    res = mysql_check_table(thd, tables, &lex->check_opt);
    break;
  }
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  case SQLCOM_ANALYZE:
  {
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    if (check_db_used(thd,tables) ||
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	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables,0))
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      goto error; /* purecov: inspected */
2608
    thd->slow_command=TRUE;
2609
    res = mysql_analyze_table(thd, tables, &lex->check_opt);
2610 2611 2612 2613 2614 2615 2616 2617 2618 2619
    /* ! 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())
      {
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
        mysql_bin_log.write(&qinfo);
      }
    }
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    break;
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2621
  }
2622

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  case SQLCOM_OPTIMIZE:
  {
2625
    if (check_db_used(thd,tables) ||
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	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables,0))
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      goto error; /* purecov: inspected */
2628
    thd->slow_command=TRUE;
2629 2630 2631
    res= (specialflag & (SPECIAL_SAFE_MODE | SPECIAL_NO_NEW_FUNC)) ?
      mysql_recreate_table(thd, tables, 1) :
      mysql_optimize_table(thd, tables, &lex->check_opt);
2632 2633 2634 2635 2636 2637 2638 2639 2640 2641
    /* ! 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())
      {
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
        mysql_bin_log.write(&qinfo);
      }
    }
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    break;
  }
  case SQLCOM_UPDATE:
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    if (update_precheck(thd, tables))
      break;
2647 2648 2649 2650
    res= mysql_update(thd,tables,
                      select_lex->item_list,
                      lex->value_list,
                      select_lex->where,
2651
		      select_lex->order_list.elements,
2652 2653 2654
                      (ORDER *) select_lex->order_list.first,
                      select_lex->select_limit,
                      lex->duplicates);
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    if (thd->net.report_error)
      res= -1;
2657 2658
    break;
  case SQLCOM_UPDATE_MULTI:
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2659
  {
2660
    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,
			    lex->duplicates, unit, select_lex);
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2668
    break;
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2669
  }
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2670
  case SQLCOM_REPLACE:
2671 2672
  case SQLCOM_INSERT:
  {
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    my_bool update= (lex->value_list.elements ? UPDATE_ACL : 0);
    if ((res= insert_precheck(thd, tables, update)))
      break;
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    res = mysql_insert(thd,tables,lex->field_list,lex->many_values,
2677
                       select_lex->item_list, lex->value_list,
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2678
                       (update ? DUP_UPDATE : lex->duplicates));
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2679 2680
    if (thd->net.report_error)
      res= -1;
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2681
    break;
2682
  }
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2683 2684 2685
  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
  {
2686 2687 2688
    TABLE_LIST *first_local_table= (TABLE_LIST *) select_lex->table_list.first;
    if ((res= insert_select_precheck(thd, tables)))
      break;
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2689

2690 2691
    /* Fix lock for first table */
    if (tables->lock_type == TL_WRITE_DELAYED)
2692
      tables->lock_type= TL_WRITE;
2693

2694 2695
    /* Don't unlock tables until command is written to binary log */
    select_lex->options|= SELECT_NO_UNLOCK;
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2696 2697

    select_result *result;
2698 2699 2700 2701
    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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2702

2703
    if (find_real_table_in_list(tables->next, tables->db, tables->real_name))
2704
    {
2705 2706
      /* Using same table for INSERT and SELECT */
      select_lex->options |= OPTION_BUFFER_RESULT;
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2707
    }
2708

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2709

2710 2711 2712
    if (!(res=open_and_lock_tables(thd, tables)))
    {
      if ((result=new select_insert(tables->table,&lex->field_list,
2713
				    lex->duplicates)))
2714
	/* Skip first table, which is the table we are inserting in */
2715
	lex->select_lex.table_list.first= (byte*) first_local_table->next;
2716 2717 2718 2719 2720
        /*
          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;
2721
	res=handle_select(thd,lex,result);
2722
	/* revert changes for SP */
2723
	lex->select_lex.table_list.first= (byte*) first_local_table;
2724
	lex->select_lex.resolve_mode= SELECT_LEX::INSERT_MODE;
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2725 2726
      if (thd->net.report_error)
	res= -1;
2727 2728 2729
    }
    else
      res= -1;
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2730 2731
    break;
  }
2732
  case SQLCOM_TRUNCATE:
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2733
    if (check_one_table_access(thd, DELETE_ACL, tables))
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      goto error;
2735 2736 2737 2738 2739 2740
    /*
      Don't allow this within a transaction because we want to use
      re-generate table
    */
    if (thd->locked_tables || thd->active_transaction())
    {
2741
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION,NullS);
2742 2743 2744 2745
      goto error;
    }
    res=mysql_truncate(thd,tables);
    break;
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2746
  case SQLCOM_DELETE:
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2747
  {
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2748 2749
    if ((res= delete_precheck(thd, tables)))
      break;
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2750
    res = mysql_delete(thd,tables, select_lex->where,
2751
                       &select_lex->order_list,
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2752
                       select_lex->select_limit, select_lex->options);
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    if (thd->net.report_error)
      res= -1;
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2755 2756
    break;
  }
2757
  case SQLCOM_DELETE_MULTI:
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2758
  {
2759 2760
    TABLE_LIST *aux_tables=
      (TABLE_LIST *)thd->lex->auxilliary_table_list.first;
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2761 2762
    TABLE_LIST *target_tbl;
    uint table_count;
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    multi_delete *result;
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2764

2765 2766
    if ((res= multi_delete_precheck(thd, tables, &table_count)))
      break;
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    /* condition will be TRUE on SP re-excuting */
2769 2770
    if (select_lex->item_list.elements != 0)
      select_lex->item_list.empty();
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2771
    if (add_item_to_list(thd, new Item_null()))
2772
    {
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2773
      res= -1;
2774
      break;
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2775
    }
2776

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2777 2778 2779 2780
    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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    for (target_tbl= (TABLE_LIST*) aux_tables;
	 target_tbl;
	 target_tbl= target_tbl->next)
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2784
    {
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2785
      target_tbl->table= target_tbl->table_list->table;
2786
      /* 
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2787 2788
	 Multi-delete can't be constructed over-union => we always have
	 single SELECT on top and have to check underlaying SELECTs of it
2789 2790 2791 2792
      */
      for (SELECT_LEX_UNIT *un= lex->select_lex.first_inner_unit();
	   un;
	   un= un->next_unit())
2793
      {
2794
	if (un->first_select()->linkage != DERIVED_TABLE_TYPE &&
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unknown committed
2795 2796
	    un->check_updateable(target_tbl->table_list->db,
				 target_tbl->table_list->real_name))
2797
	{
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unknown committed
2798 2799
	  my_error(ER_UPDATE_TABLE_USED, MYF(0),
		   target_tbl->table_list->real_name);
2800 2801 2802 2803
	  res= -1;
	  break;
	}
      }
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unknown committed
2804
    }
2805

2806 2807
    if (!thd->is_fatal_error && (result= new multi_delete(thd,aux_tables,
							  table_count)))
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unknown committed
2808
    {
2809 2810 2811
      res= mysql_select(thd, &select_lex->ref_pointer_array,
			select_lex->get_table_list(),
			select_lex->with_wild,
2812
			select_lex->item_list,
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2813
			select_lex->where,
2814
			0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
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unknown committed
2815 2816
			(ORDER *)NULL,
			select_lex->options | thd->options |
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2817
			SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK,
2818
			result, unit, select_lex);
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unknown committed
2819 2820
      if (thd->net.report_error)
	res= -1;
2821
      delete result;
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2822 2823 2824 2825 2826 2827
    }
    else
      res= -1;					// Error is not sent
    close_thread_tables(thd);
    break;
  }
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  case SQLCOM_DROP_TABLE:
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2829
  {
2830 2831
    if (!lex->drop_temporary)
    {
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      if (check_table_access(thd,DROP_ACL,tables,0))
2833 2834 2835 2836 2837 2838 2839
	goto error;				/* purecov: inspected */
      if (end_active_trans(thd))
      {
	res= -1;
	break;
      }
    }
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    else
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    {
      /*
	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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2847 2848
	To not generate such irrelevant "table does not exist errors",
	we silently add IF EXISTS if TEMPORARY was used.
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      */
      if (thd->slave_thread)
	lex->drop_if_exists= 1;
    }
2853
    res= mysql_rm_table(thd,tables,lex->drop_if_exists, lex->drop_temporary);
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  }
  break;
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2856
  case SQLCOM_DROP_INDEX:
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2857
    if (check_one_table_access(thd, INDEX_ACL, tables))
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2858
      goto error;				/* purecov: inspected */
2859 2860 2861
    if (end_active_trans(thd))
      res= -1;
    else
2862
      res = mysql_drop_index(thd, tables, &lex->alter_info);
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2863 2864
    break;
  case SQLCOM_SHOW_DATABASES:
2865
#if defined(DONT_ALLOW_SHOW_COMMANDS)
2866
    send_error(thd,ER_NOT_ALLOWED_COMMAND);   /* purecov: inspected */
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    DBUG_VOID_RETURN;
#else
    if ((specialflag & SPECIAL_SKIP_SHOW_DB) &&
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unknown committed
2870
	check_global_access(thd, SHOW_DB_ACL))
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      goto error;
    res= mysqld_show_dbs(thd, (lex->wild ? lex->wild->ptr() : NullS));
    break;
#endif
  case SQLCOM_SHOW_PROCESSLIST:
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2876
    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
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2877
      break;
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    mysqld_list_processes(thd,
			  thd->master_access & PROCESS_ACL ? NullS :
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2880
			  thd->priv_user,lex->verbose);
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    break;
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  case SQLCOM_SHOW_STORAGE_ENGINES:
    res= mysqld_show_storage_engines(thd);
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2884 2885 2886 2887 2888 2889 2890
    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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  case SQLCOM_SHOW_STATUS:
2892
    res= mysqld_show(thd,(lex->wild ? lex->wild->ptr() : NullS),status_vars,
2893
		     OPT_GLOBAL, &LOCK_status);
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    break;
  case SQLCOM_SHOW_VARIABLES:
    res= mysqld_show(thd, (lex->wild ? lex->wild->ptr() : NullS),
2897 2898
		     init_vars, lex->option_type,
		     &LOCK_global_system_variables);
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    break;
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2900 2901
  case SQLCOM_SHOW_LOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2902
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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    DBUG_VOID_RETURN;
#else
    {
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2906
      if (grant_option && check_access(thd, FILE_ACL, any_db,0,0,0))
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	goto error;
      res= mysqld_show_logs(thd);
      break;
    }
#endif
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  case SQLCOM_SHOW_TABLES:
2913
    /* FALL THROUGH */
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2914
#ifdef DONT_ALLOW_SHOW_COMMANDS
2915
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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    DBUG_VOID_RETURN;
#else
    {
2919
      char *db=select_lex->db ? select_lex->db : thd->db;
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2920 2921
      if (!db)
      {
2922
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
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2923 2924 2925
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);				// Fix escaped '_'
2926
      if (check_db_name(db))
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unknown committed
2927
      {
2928
        net_printf(thd,ER_WRONG_DB_NAME, db);
2929
        goto error;
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2930
      }
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2931
      if (check_access(thd,SELECT_ACL,db,&thd->col_access,0,0))
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2932
	goto error;				/* purecov: inspected */
unknown's avatar
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2933
      if (!thd->col_access && check_grant_db(thd,db))
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2934
      {
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2935
	net_printf(thd, ER_DBACCESS_DENIED_ERROR,
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2936 2937 2938 2939 2940
		   thd->priv_user,
		   thd->priv_host,
		   db);
	goto error;
      }
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2941
      /* grant is checked in mysqld_show_tables */
2942
      if (lex->describe)
2943
        res= mysqld_extend_show_tables(thd,db,
2944
				       (lex->wild ? lex->wild->ptr() : NullS));
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2945 2946 2947 2948 2949 2950
      else
	res= mysqld_show_tables(thd,db,
				(lex->wild ? lex->wild->ptr() : NullS));
      break;
    }
#endif
2951 2952 2953
  case SQLCOM_SHOW_OPEN_TABLES:
    res= mysqld_show_open_tables(thd,(lex->wild ? lex->wild->ptr() : NullS));
    break;
2954 2955
  case SQLCOM_SHOW_CHARSETS:
    res= mysqld_show_charsets(thd,(lex->wild ? lex->wild->ptr() : NullS));
2956
    break;
2957 2958 2959
  case SQLCOM_SHOW_COLLATIONS:
    res= mysqld_show_collations(thd,(lex->wild ? lex->wild->ptr() : NullS));
    break;
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2960 2961
  case SQLCOM_SHOW_FIELDS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2962
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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2963 2964 2965
    DBUG_VOID_RETURN;
#else
    {
2966
      char *db=tables->db;
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2967
      remove_escape(db);			// Fix escaped '_'
2968
      remove_escape(tables->real_name);
2969
      if (check_access(thd,SELECT_ACL | EXTRA_ACL,db,
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2970
		       &tables->grant.privilege, 0, 0))
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2971
	goto error;				/* purecov: inspected */
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2972
      if (grant_option && check_grant(thd, SELECT_ACL, tables, 2, UINT_MAX, 0))
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2973 2974
	goto error;
      res= mysqld_show_fields(thd,tables,
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2975 2976
			      (lex->wild ? lex->wild->ptr() : NullS),
			      lex->verbose);
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2977 2978 2979 2980 2981
      break;
    }
#endif
  case SQLCOM_SHOW_KEYS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2982
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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2983 2984 2985
    DBUG_VOID_RETURN;
#else
    {
2986
      char *db=tables->db;
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2987
      remove_escape(db);			// Fix escaped '_'
2988
      remove_escape(tables->real_name);
unknown's avatar
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2989
      if (check_access(thd,SELECT_ACL | EXTRA_ACL,db,
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2990
		       &tables->grant.privilege, 0, 0))
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2991
	goto error;				/* purecov: inspected */
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2992
      if (grant_option && check_grant(thd, SELECT_ACL, tables, 2, UINT_MAX, 0))
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2993 2994 2995 2996 2997 2998
	goto error;
      res= mysqld_show_keys(thd,tables);
      break;
    }
#endif
  case SQLCOM_CHANGE_DB:
2999
    mysql_change_db(thd,select_lex->db);
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3000
    break;
3001

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3002 3003 3004
  case SQLCOM_LOAD:
  {
    uint privilege= (lex->duplicates == DUP_REPLACE ?
3005
		     INSERT_ACL | DELETE_ACL : INSERT_ACL);
3006 3007

    if (!lex->local_file)
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3008
    {
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3009
      if (check_access(thd,privilege | FILE_ACL,tables->db,0,0,0))
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3010 3011 3012 3013
	goto error;
    }
    else
    {
3014
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
unknown's avatar
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3015
	  ! opt_local_infile)
3016
      {
3017
	send_error(thd,ER_NOT_ALLOWED_COMMAND);
3018 3019
	goto error;
      }
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3020
      if (check_one_table_access(thd, privilege, tables))
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3021 3022 3023 3024 3025 3026
	goto error;
    }
    res=mysql_load(thd, lex->exchange, tables, lex->field_list,
		   lex->duplicates, (bool) lex->local_file, lex->lock_option);
    break;
  }
3027

unknown's avatar
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3028
  case SQLCOM_SET_OPTION:
3029 3030
  {
    List<set_var_base> *lex_var_list= &lex->var_list;
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3031
    if (tables && ((res= check_table_access(thd, SELECT_ACL, tables,0)) ||
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3032 3033
		   (res= open_and_lock_tables(thd,tables))))
      break;
3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047
    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;
3048
      send_ok(thd);
3049
    }
unknown's avatar
unknown committed
3050 3051
    if (thd->net.report_error)
      res= -1;
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3052
    break;
3053
  }
unknown's avatar
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3054

unknown's avatar
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3055
  case SQLCOM_UNLOCK_TABLES:
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3056
    unlock_locked_tables(thd);
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3057 3058
    if (thd->options & OPTION_TABLE_LOCK)
    {
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3059
      end_active_trans(thd);
unknown's avatar
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3060
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
unknown's avatar
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3061 3062
    }
    if (thd->global_read_lock)
3063
      unlock_global_read_lock(thd);
3064
    send_ok(thd);
unknown's avatar
unknown committed
3065 3066
    break;
  case SQLCOM_LOCK_TABLES:
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3067
    unlock_locked_tables(thd);
3068
    if (check_db_used(thd,tables) || end_active_trans(thd))
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3069
      goto error;
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3070
    if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, tables,0))
3071
      goto error;
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unknown committed
3072
    thd->in_lock_tables=1;
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3073
    thd->options|= OPTION_TABLE_LOCK;
3074
    if (!(res= open_and_lock_tables(thd, tables)))
unknown's avatar
unknown committed
3075
    {
3076 3077 3078 3079
#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
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3080 3081
      thd->locked_tables=thd->lock;
      thd->lock=0;
3082
      send_ok(thd);
unknown's avatar
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3083
    }
unknown's avatar
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3084 3085
    else
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
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3086 3087 3088
    thd->in_lock_tables=0;
    break;
  case SQLCOM_CREATE_DB:
3089
  {
unknown's avatar
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3090
    char *alias;
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unknown committed
3091
    if (!(alias=thd->strdup(lex->name)) || check_db_name(lex->name))
unknown's avatar
unknown committed
3092
    {
3093
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
unknown's avatar
unknown committed
3094 3095
      break;
    }
3096 3097 3098 3099 3100 3101 3102
    /*
      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.
    */
3103
#ifdef HAVE_REPLICATION
3104 3105 3106
    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
3107 3108
    {
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
3109
      break;
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3110
    }
3111
#endif
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3112
    if (check_access(thd,CREATE_ACL,lex->name,0,1,0))
3113
      break;
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3114
    res= mysql_create_db(thd,(lower_case_table_names == 2 ? alias : lex->name),
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3115
			 &lex->create_info, 0);
3116 3117
    break;
  }
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3118
  case SQLCOM_DROP_DB:
3119
  {
unknown's avatar
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3120
    char *alias;
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unknown committed
3121
    if (!(alias=thd->strdup(lex->name)) || check_db_name(lex->name))
unknown's avatar
unknown committed
3122
    {
3123
      net_printf(thd, ER_WRONG_DB_NAME, lex->name);
unknown's avatar
unknown committed
3124 3125
      break;
    }
3126 3127 3128 3129 3130 3131 3132
    /*
      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.
    */
3133
#ifdef HAVE_REPLICATION
3134 3135 3136
    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
3137 3138
    {
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
3139
      break;
unknown's avatar
unknown committed
3140
    }
3141
#endif
unknown's avatar
unknown committed
3142
    if (check_access(thd,DROP_ACL,lex->name,0,1,0))
3143
      break;
3144 3145
    if (thd->locked_tables || thd->active_transaction())
    {
3146
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
3147 3148
      goto error;
    }
3149 3150
    res=mysql_rm_db(thd, (lower_case_table_names == 2 ? alias : lex->name),
                    lex->drop_if_exists, 0);
3151 3152
    break;
  }
3153 3154 3155 3156
  case SQLCOM_ALTER_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
3157
      net_printf(thd, ER_WRONG_DB_NAME, lex->name);
3158 3159
      break;
    }
unknown's avatar
unknown committed
3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175
    /*
      If in a slave thread :
      ALTER 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.
    */
#ifdef HAVE_REPLICATION
    if (thd->slave_thread && 
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
    {
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
      break;
    }
#endif
unknown's avatar
unknown committed
3176
    if (check_access(thd,ALTER_ACL,lex->name,0,1,0))
3177 3178 3179
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
3180
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
3181 3182
      goto error;
    }
3183
    res=mysql_alter_db(thd,lex->name,&lex->create_info);
3184 3185
    break;
  }
unknown's avatar
unknown committed
3186 3187 3188 3189
  case SQLCOM_SHOW_CREATE_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
3190
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
unknown's avatar
unknown committed
3191 3192
      break;
    }
unknown's avatar
unknown committed
3193
    if (check_access(thd,SELECT_ACL,lex->name,0,1,0))
unknown's avatar
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3194 3195 3196
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
3197
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
unknown's avatar
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3198 3199
      goto error;
    }
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3200
    res=mysqld_show_create_db(thd,lex->name,&lex->create_info);
unknown's avatar
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3201 3202
    break;
  }
unknown's avatar
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3203
  case SQLCOM_CREATE_FUNCTION:
unknown's avatar
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3204
    if (check_access(thd,INSERT_ACL,"mysql",0,1,0))
unknown's avatar
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3205 3206 3207
      break;
#ifdef HAVE_DLOPEN
    if (!(res = mysql_create_function(thd,&lex->udf)))
3208
      send_ok(thd);
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3209 3210 3211 3212 3213
#else
    res= -1;
#endif
    break;
  case SQLCOM_DROP_FUNCTION:
unknown's avatar
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3214
    if (check_access(thd,DELETE_ACL,"mysql",0,1,0))
unknown's avatar
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3215 3216
      break;
#ifdef HAVE_DLOPEN
3217
    if (!(res = mysql_drop_function(thd,&lex->udf.name)))
3218
      send_ok(thd);
unknown's avatar
unknown committed
3219 3220 3221 3222
#else
    res= -1;
#endif
    break;
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3223
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3224 3225
  case SQLCOM_DROP_USER:
  {
unknown's avatar
unknown committed
3226
    if (check_access(thd, GRANT_ACL,"mysql",0,1,0))
3227 3228 3229 3230 3231 3232 3233 3234 3235 3236 3237 3238 3239 3240 3241
      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())
      {
	Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
	mysql_bin_log.write(&qinfo);
      }
      send_ok(thd);
    }
    break;
  }
  case SQLCOM_REVOKE_ALL:
  {
unknown's avatar
unknown committed
3242
    if (check_access(thd, GRANT_ACL ,"mysql",0,1,0))
3243 3244 3245 3246 3247 3248 3249 3250 3251 3252 3253 3254 3255
      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())
      {
	Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
	mysql_bin_log.write(&qinfo);
      }
      send_ok(thd);
    }
    break;
  }
3256 3257 3258 3259 3260 3261
  case SQLCOM_REVOKE:
  case SQLCOM_GRANT:
  {
    if (check_access(thd, lex->grant | lex->grant_tot_col | GRANT_ACL,
		     tables && tables->db ? tables->db : select_lex->db,
		     tables ? &tables->grant.privilege : 0,
unknown's avatar
unknown committed
3262
		     tables ? 0 : 1,0))
3263 3264
      goto error;

unknown's avatar
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3265 3266 3267 3268
    /*
      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
    */
3269 3270 3271 3272 3273 3274 3275 3276 3277 3278

    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 &&
unknown's avatar
unknown committed
3279
	     my_strcasecmp(&my_charset_latin1,
3280
                           user->host.str, thd->host_or_ip)))
3281
	{
unknown's avatar
unknown committed
3282
	  if (check_access(thd, UPDATE_ACL, "mysql",0,1,0))
3283 3284 3285 3286 3287
	    goto error;
	  break;			// We are allowed to do changes
	}
      }
    }
unknown's avatar
SCRUM  
unknown committed
3288 3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300
    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);
      }
    }
3301 3302 3303 3304 3305
    if (tables)
    {
      if (grant_option && check_grant(thd,
				      (lex->grant | lex->grant_tot_col |
				       GRANT_ACL),
unknown's avatar
unknown committed
3306
				      tables, 0, UINT_MAX, 0))
3307
	goto error;
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3308 3309 3310
      if (!(res = mysql_table_grant(thd,tables,lex->users_list, lex->columns,
				    lex->grant,
				    lex->sql_command == SQLCOM_REVOKE)))
3311
      {
3312
	mysql_update_log.write(thd, thd->query, thd->query_length);
3313 3314
	if (mysql_bin_log.is_open())
	{
unknown's avatar
unknown committed
3315
          thd->clear_error();
3316
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
3317 3318 3319 3320 3321 3322 3323 3324
	  mysql_bin_log.write(&qinfo);
	}
      }
    }
    else
    {
      if (lex->columns.elements)
      {
3325
	send_error(thd,ER_ILLEGAL_GRANT_FOR_TABLE);
3326 3327 3328 3329 3330 3331 3332
	res=1;
      }
      else
	res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
			  lex->sql_command == SQLCOM_REVOKE);
      if (!res)
      {
3333
	mysql_update_log.write(thd, thd->query, thd->query_length);
3334 3335
	if (mysql_bin_log.is_open())
	{
unknown's avatar
unknown committed
3336
          thd->clear_error();
3337
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
3338 3339
	  mysql_bin_log.write(&qinfo);
	}
3340
	if (mqh_used && lex->sql_command == SQLCOM_GRANT)
3341
	{
unknown's avatar
unknown committed
3342 3343 3344
	  List_iterator <LEX_USER> str_list(lex->users_list);
	  LEX_USER *user;
	  while ((user=str_list++))
3345
	    reset_mqh(thd,user);
3346
	}
3347 3348 3349 3350
      }
    }
    break;
  }
unknown's avatar
SCRUM  
unknown committed
3351
#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/
unknown's avatar
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3352
  case SQLCOM_RESET:
3353 3354 3355 3356 3357 3358 3359
    /* 
       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:
  {
unknown's avatar
unknown committed
3360
    if (check_global_access(thd,RELOAD_ACL) || check_db_used(thd, tables))
unknown's avatar
unknown committed
3361
      goto error;
3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385
    /*
      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())
        {
          Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
          mysql_bin_log.write(&qinfo);
        }
      }
      send_ok(thd);
    }
unknown's avatar
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3386
    break;
3387
  }
unknown's avatar
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3388 3389 3390
  case SQLCOM_KILL:
    kill_one_thread(thd,lex->thread_id);
    break;
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3391
#ifndef NO_EMBEDDED_ACCESS_CHECKS
unknown's avatar
unknown committed
3392 3393
  case SQLCOM_SHOW_GRANTS:
    res=0;
3394 3395
    if ((thd->priv_user &&
	 !strcmp(thd->priv_user,lex->grant_user->user.str)) ||
unknown's avatar
unknown committed
3396
	!check_access(thd, SELECT_ACL, "mysql",0,1,0))
unknown's avatar
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3397 3398 3399 3400
    {
      res = mysql_show_grants(thd,lex->grant_user);
    }
    break;
unknown's avatar
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3401
#endif
3402
  case SQLCOM_HA_OPEN:
3403
    if (check_db_used(thd,tables) ||
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3404
	check_table_access(thd,SELECT_ACL, tables,0))
3405 3406 3407 3408 3409 3410 3411 3412 3413
      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:
3414 3415 3416 3417 3418
    /*
      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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    if (check_db_used(thd,tables))
3420
      goto error;
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    res = mysql_ha_read(thd, tables, lex->ha_read_mode, lex->backup_dir,
3422 3423
			lex->insert_list, lex->ha_rkey_mode, select_lex->where,
			select_lex->select_limit, select_lex->offset_limit);
3424 3425
    break;

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  case SQLCOM_BEGIN:
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    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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    if (end_active_trans(thd))
    {
      res= -1;
    }
    else
    {
3439
      thd->options= ((thd->options & (ulong) ~(OPTION_STATUS_NO_TRANS_UPDATE)) |
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3440 3441
		     OPTION_BEGIN);
      thd->server_status|= SERVER_STATUS_IN_TRANS;
3442
      send_ok(thd);
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    }
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    break;
  case SQLCOM_COMMIT:
3446 3447 3448 3449 3450
    /*
      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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  {
3452
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
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    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    if (!ha_commit(thd))
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    {
3456
      send_ok(thd);
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    }
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    else
      res= -1;
    break;
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  }
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  case SQLCOM_ROLLBACK:
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    if (!ha_rollback(thd))
3465
    {
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      /*
        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)
3476
	send_warning(thd,ER_WARNING_NOT_COMPLETE_ROLLBACK,0);
3477
      else
3478
	send_ok(thd);
3479
    }
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    else
      res= -1;
3482
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
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    break;
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  case SQLCOM_ROLLBACK_TO_SAVEPOINT:
    if (!ha_rollback_to_savepoint(thd, lex->savepoint_name))
    {
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      if ((thd->options & OPTION_STATUS_NO_TRANS_UPDATE) && !thd->slave_thread)
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	send_warning(thd, ER_WARNING_NOT_COMPLETE_ROLLBACK, 0);
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      else
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	send_ok(thd);
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    }
    else
      res= -1;
    break;
3495
  case SQLCOM_SAVEPOINT:
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    if (!ha_savepoint(thd, lex->savepoint_name))
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      send_ok(thd);
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    else
      res= -1;
3500
    break;
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  default:					/* Impossible */
3502
    send_ok(thd);
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    break;
  }
  thd->proc_info="query end";			// QQ
3506 3507 3508 3509 3510 3511 3512 3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524
  if (thd->one_shot_set)
    {
      /*
        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)
      {
        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();
3525 3526
        thd->variables.time_zone=
          global_system_variables.time_zone;
3527 3528 3529
        thd->one_shot_set= 0;
      }
    }
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  if (res < 0)
3531
    send_error(thd,thd->killed ? ER_SERVER_SHUTDOWN : 0);
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error:
  DBUG_VOID_RETURN;
}


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/*
  Check grants for commands which work only with one table and all other
  tables belong to subselects.

3542
  SYNOPSIS
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    check_one_table_access()
    thd			Thread handler
    privilege		requested privelage
    tables		table list of command
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  RETURN
    0 - OK
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    1 - access denied, error is sent to client
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*/
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int check_one_table_access(THD *thd, ulong privilege, TABLE_LIST *tables)
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{
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  if (check_access(thd, privilege, tables->db, &tables->grant.privilege,0,0))
    return 1;
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  /* Show only 1 table for check_grant */
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  if (grant_option && check_grant(thd, privilege, tables, 0, 1, 0))
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    return 1;
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3561

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  /* Check rights on tables of subselect (if exists) */
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  TABLE_LIST *subselects_tables;
  if ((subselects_tables= tables->next))
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  {
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    if ((check_table_access(thd, SELECT_ACL, subselects_tables,0)))
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      return 1;
  }
  return 0;
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}


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/****************************************************************************
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  Get the user (global) and database privileges for all used tables
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  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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                is enough to satisfy the request and the global grants contains
                a SELECT grant.
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****************************************************************************/

bool
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check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
3594
	     bool dont_check_global_grants, bool no_errors)
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{
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  DBUG_ENTER("check_access");
  DBUG_PRINT("enter",("want_access: %lu  master_access: %lu", want_access,
		      thd->master_access));
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
  ulong db_access;
#endif
  ulong dummy;
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  if (save_priv)
    *save_priv=0;
  else
    save_priv= &dummy;

3608
  if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
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  {
3610
    if (!no_errors)
3611
      send_error(thd,ER_NO_DB_ERROR);	/* purecov: tested */
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    DBUG_RETURN(TRUE);				/* purecov: tested */
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  }

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#ifdef NO_EMBEDDED_ACCESS_CHECKS
  DBUG_RETURN(0);
#else
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  if ((thd->master_access & want_access) == want_access)
  {
3620 3621 3622 3623 3624 3625 3626 3627
    /*
      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) &&
	(db && (!thd->db || strcmp(db,thd->db))))
3628
      db_access=acl_get(thd->host, thd->ip,
3629
			thd->priv_user, db, test(want_access & GRANT_ACL));
3630
    *save_priv=thd->master_access | db_access;
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    DBUG_RETURN(FALSE);
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  }
3633
  if (((want_access & ~thd->master_access) & ~(DB_ACLS | EXTRA_ACL)) ||
3634
      ! db && dont_check_global_grants)
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  {						// We can never grant this
3636
    if (!no_errors)
3637
      net_printf(thd,ER_ACCESS_DENIED_ERROR,
3638
		 thd->priv_user,
3639
		 thd->priv_host,
3640
		 thd->password ? ER(ER_YES) : ER(ER_NO));/* purecov: tested */
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    DBUG_RETURN(TRUE);				/* purecov: tested */
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  }

  if (db == any_db)
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    DBUG_RETURN(FALSE);				// Allow select on anything
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3646

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  if (db && (!thd->db || strcmp(db,thd->db)))
3648
    db_access=acl_get(thd->host, thd->ip,
3649
		      thd->priv_user, db, test(want_access & GRANT_ACL));
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  else
    db_access=thd->db_access;
3652 3653
  // Remove SHOW attribute and access rights we already have
  want_access &= ~(thd->master_access | EXTRA_ACL);
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  db_access= ((*save_priv=(db_access | thd->master_access)) & want_access);
3655 3656

  /* grant_option is set if there exists a single table or column grant */
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  if (db_access == want_access ||
3658
      ((grant_option && !dont_check_global_grants) &&
3659
       !(want_access & ~(db_access | TABLE_ACLS))))
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3660
    DBUG_RETURN(FALSE);				/* Ok */
3661
  if (!no_errors)
3662
    net_printf(thd,ER_DBACCESS_DENIED_ERROR,
3663
	       thd->priv_user,
3664
	       thd->priv_host,
3665
	       db ? db : thd->db ? thd->db : "unknown"); /* purecov: tested */
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  DBUG_RETURN(TRUE);				/* purecov: tested */
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#endif /* NO_EMBEDDED_ACCESS_CHECKS */
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}


3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688
/*
  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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3691
{
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3692 3693 3694
#ifdef NO_EMBEDDED_ACCESS_CHECKS
  return 0;
#else
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  char command[128];
3696
  if ((thd->master_access & want_access))
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    return 0;
  get_privilege_desc(command, sizeof(command), want_access);
3699
  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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*/

3711
bool
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check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables,
3713
		   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)
  {
3720
    if (tables->derived || (tables->table && (int)tables->table->tmp_table))
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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
      {
3731 3732
	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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3736 3737
      }
    }
3738
    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
3739
			  0, no_errors))
3740
      return TRUE;
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3741 3742
  }
  if (grant_option)
3743
    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;
}

3748 3749
bool check_merge_table_access(THD *thd, char *db,
			      TABLE_LIST *table_list)
3750 3751 3752 3753
{
  int error=0;
  if (table_list)
  {
3754
    /* Check that all tables use the current database */
3755 3756
    TABLE_LIST *tmp;
    for (tmp=table_list; tmp ; tmp=tmp->next)
3757 3758 3759 3760
    {
      if (!tmp->db || !tmp->db[0])
	tmp->db=db;
    }
3761
    error=check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
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			     table_list,0);
3763 3764 3765 3766
  }
  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;
}
3783

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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

3798
#ifndef EMBEDDED_LIBRARY
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3799 3800 3801 3802 3803 3804 3805 3806
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));
3807
    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;
}
3815
#endif /* EMBEDDED_LIBRARY */
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#define MY_YACC_INIT 1000			// Start with big alloc
#define MY_YACC_MAX  32000			// Because of 'short'

3820
bool my_yyoverflow(short **yyss, YYSTYPE **yyvs, ulong *yystacksize)
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{
  LEX	*lex=current_lex;
3823
  ulong old_info=0;
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3824 3825 3826 3827 3828 3829 3830 3831 3832 3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849
  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;
}


/****************************************************************************
3850
  Initialize global thd variables needed for query
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****************************************************************************/

3853
void
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3854
mysql_init_query(THD *thd, uchar *buf, uint length)
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{
  DBUG_ENTER("mysql_init_query");
3857
  LEX *lex= thd->lex;
3858 3859
  lex->unit.init_query();
  lex->unit.init_select();
3860
  lex->unit.thd= thd;
3861 3862 3863
  lex->select_lex.init_query();
  lex->value_list.empty();
  lex->param_list.empty();
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  lex->unit.next= lex->unit.master= 
    lex->unit.link_next= lex->unit.return_to=0;
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  lex->unit.prev= lex->unit.link_prev= 0;
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  lex->unit.slave= lex->unit.global_parameters= lex->current_select=
3868
    lex->all_selects_list= &lex->select_lex;
3869 3870
  lex->select_lex.master= &lex->unit;
  lex->select_lex.prev= &lex->unit.slave;
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  lex->select_lex.link_next= lex->select_lex.slave= lex->select_lex.next= 0;
3872
  lex->select_lex.link_prev= (st_select_lex_node**)&(lex->all_selects_list);
3873
  lex->select_lex.options=0;
3874 3875
  lex->describe= 0;
  lex->derived_tables= FALSE;
3876 3877
  lex->lock_option= TL_READ;
  lex->found_colon= 0;
3878
  lex->safe_to_cache_query= 1;
3879
  lex->time_zone_tables_used= 0;
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3880
  lex_start(thd, buf, length);
3881
  thd->select_number= lex->select_lex.select_number= 1;
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3882
  thd->free_list= 0;
3883
  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;
3886
  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);
3893
  thd->clear_error();
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  DBUG_VOID_RETURN;
}

3897

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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();
3903
  select_lex->select_limit= HA_POS_ERROR;
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  if (select_lex == &lex->select_lex)
  {
    lex->exchange= 0;
    lex->result= 0;
    lex->proc_list.first= 0;
  }
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}

3912

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bool
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mysql_new_select(LEX *lex, bool move_down)
3915
{
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  SELECT_LEX *select_lex = new(&lex->thd->mem_root) SELECT_LEX();
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  if (!select_lex)
    return 1;
3919
  select_lex->select_number= ++lex->thd->select_number;
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  select_lex->init_query();
  select_lex->init_select();
  if (move_down)
  {
    /* first select_lex of subselect or derived table */
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    SELECT_LEX_UNIT *unit= new(&lex->thd->mem_root) SELECT_LEX_UNIT();
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    if (!unit)
      return 1;
    unit->init_query();
    unit->init_select();
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    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;
3934
    unit->return_to= lex->current_select;
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    select_lex->include_down(unit);
3936
    // TODO: assign resolve_mode for fake subquery after merging with new tree
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  }
  else
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  {
3940
    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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      fake= unit->fake_select_lex= new(&lex->thd->mem_root) SELECT_LEX();
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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;
3955
      fake->select_limit= HA_POS_ERROR;
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    }
  }
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3959
  select_lex->master_unit()->global_parameters= select_lex;
3960
  select_lex->include_global((st_select_lex_node**)&lex->all_selects_list);
3961
  lex->current_select= select_lex;
3962
  select_lex->resolve_mode= SELECT_LEX::SELECT_MODE;
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  return 0;
3964
}
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3966 3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977 3978 3979 3980
/*
  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)
{
3981
  THD *thd;
3982
  LEX *lex;
3983
  LEX_STRING tmp, null_lex_string;
3984
  DBUG_ENTER("create_select_for_variable");
3985 3986

  thd= current_thd;
3987
  lex= thd->lex;
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  mysql_init_select(lex);
  lex->sql_command= SQLCOM_SELECT;
  tmp.str= (char*) var_name;
  tmp.length=strlen(var_name);
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  bzero((char*) &null_lex_string.str, sizeof(null_lex_string));
  add_item_to_list(thd, get_system_var(thd, OPT_SESSION, tmp,
				       null_lex_string));
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  DBUG_VOID_RETURN;
}

3998

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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);
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  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);
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}
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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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4014
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;
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    if (!yyparse((void *)thd) && ! thd->is_fatal_error)
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    {
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
4025
      if (mqh_used && thd->user_connect &&
4026
	  check_mqh(thd, lex->sql_command))
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      {
	thd->net.error = 0;
      }
      else
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#endif
4032
      {
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	if (thd->net.report_error)
	  send_error(thd, 0, NullS);
	else
	{
	  mysql_execute_command(thd);
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	  query_cache_end_of_result(thd);
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	}
4040
      }
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    }
    else
4043 4044
    {
      DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
4045
			 thd->is_fatal_error));
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      query_cache_abort(&thd->net);
4047
    }
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    thd->proc_info="freeing items";
4049
    free_items(thd->free_list);  /* Free strings used by items */
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    lex_end(lex);
  }
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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;
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  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 &&
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      all_tables_not_ok(thd,(TABLE_LIST*) lex->select_lex.table_list.first))
    error= 1;                /* Ignore question */
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  free_items(thd->free_list);  /* Free strings used by items */
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  lex_end(lex);

  return error;
}
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#endif
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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,
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		       uint type_modifier,
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		       Item *default_value, Item *on_update_value,
                       LEX_STRING *comment,
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		       char *change, TYPELIB *interval, CHARSET_INFO *cs,
		       uint uint_geom_type)
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{
  register create_field *new_field;
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  LEX  *lex= thd->lex;
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  uint allowed_type_modifier=0;
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  char warn_buff[MYSQL_ERRMSG_SIZE];
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  DBUG_ENTER("add_field_to_list");

  if (strlen(field_name) > NAME_LEN)
  {
4103
    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));
4109
    lex->key_list.push_back(new Key(Key::PRIMARY, NullS, HA_KEY_ALG_UNDEF,
4110
				    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));
4116
    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();
  }

4121
  if (default_value)
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  {
4123
    /* 
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      Default value should be literal => basic constants =>
      no need fix_fields()
4126 4127 4128
      
      We allow only one function as part of default value - 
      NOW() as default for TIMESTAMP type.
4129
    */
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    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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    {
4139 4140 4141 4142
      default_value=0;
      if ((type_modifier & (NOT_NULL_FLAG | AUTO_INCREMENT_FLAG)) ==
	  NOT_NULL_FLAG)
      {
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	net_printf(thd,ER_INVALID_DEFAULT,field_name);
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	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);
    }
  }
4153 4154 4155 4156 4157 4158 4159

  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;
4164
  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;
4175
  new_field->charset=cs;
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  new_field->geom_type= (Field::geometry_type) uint_geom_type;
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4178 4179 4180 4181 4182 4183 4184 4185
  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;
4188
  }
4189 4190
  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 &&
4194
      new_field->length < new_field->decimals+1 &&
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      new_field->decimals != NOT_FIXED_DEC)
4196
    new_field->length=new_field->decimals+1; /* purecov: inspected */
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  switch (type) {
  case FIELD_TYPE_TINY:
    if (!length) new_field->length=3+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_SHORT:
    if (!length) new_field->length=5+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_INT24:
    if (!length) new_field->length=8+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_LONG:
    if (!length) new_field->length=10+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_LONGLONG:
    if (!length) new_field->length=20;
    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))
4225 4226
        new_field->length++;
      else
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        new_field->length= 10;                  // Default length for DECIMAL
    }
4229 4230 4231 4232 4233 4234
    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;
4236 4237
  case FIELD_TYPE_STRING:
  case FIELD_TYPE_VAR_STRING:
4238
    if (new_field->length <= MAX_FIELD_CHARLENGTH || default_value)
4239 4240 4241 4242
      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");
4244 4245 4246
    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:
4252 4253 4254 4255 4256 4257 4258 4259 4260 4261 4262 4263 4264 4265
    if (new_field->length)
    {
      /* The user has given a length to the blob column */
      if (new_field->length < 256)
	type= FIELD_TYPE_TINY_BLOB;
      if (new_field->length < 65536)
	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())
      {
4272
	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)
      {
4292
	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
4322
    else if (new_field->length != 19)
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    {
4324 4325 4326 4327
      /*
        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 */
    }
    new_field->flags|= ZEROFILL_FLAG | UNSIGNED_FLAG | NOT_NULL_FLAG;
4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359
    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
    {
      /* 
        We are setting TIMESTAMP_OLD_FIELD here only temporary, we will 
        replace this value by TIMESTAMP_DNUN_FIELD or NONE later when 
        information about all TIMESTAMP fields in table will be availiable.
      */
      new_field->unireg_check= on_update_value?Field::TIMESTAMP_UN_FIELD:
                                               Field::TIMESTAMP_OLD_FIELD;
    }
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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:
    {
      if (interval->count > sizeof(longlong)*8)
      {
4378
	net_printf(thd,ER_TOO_BIG_SET,field_name); /* purecov: inspected */
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	DBUG_RETURN(1);				/* purecov: inspected */
      }
      new_field->pack_length=(interval->count+7)/8;
      if (new_field->pack_length > 4)
	new_field->pack_length=8;
      new_field->interval=interval;
      new_field->length=0;
      for (const char **pos=interval->type_names; *pos ; pos++)
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      {
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        uint length= (uint) strip_sp((char*) *pos)+1;
        CHARSET_INFO *cs= thd->variables.character_set_client;
        length= cs->cset->numchars(cs, *pos, *pos+length);
        new_field->length+= length;
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      }
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      new_field->length--;
      set_if_smaller(new_field->length,MAX_FIELD_WIDTH-1);
      if (default_value)
      {
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	char *not_used;
	uint not_used2;
4399
	bool not_used3;
4400

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	thd->cuted_fields=0;
	String str,*res;
	res=default_value->val_str(&str);
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	(void) find_set(interval, res->ptr(), res->length(), &not_used,
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			&not_used2, &not_used3);
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	if (thd->cuted_fields)
	{
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	  net_printf(thd,ER_INVALID_DEFAULT,field_name);
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	  DBUG_RETURN(1);
	}
      }
    }
    break;
  case FIELD_TYPE_ENUM:
    {
      new_field->interval=interval;
      new_field->pack_length=interval->count < 256 ? 1 : 2; // Should be safe
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      new_field->length=(uint) strip_sp((char*) interval->type_names[0]);
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      for (const char **pos=interval->type_names+1; *pos ; pos++)
      {
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        uint length=(uint) strip_sp((char*) *pos);
        CHARSET_INFO *cs= thd->variables.character_set_client;
        length= cs->cset->numchars(cs, *pos, *pos+length);
        set_if_bigger(new_field->length,length);
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      }
      set_if_smaller(new_field->length,MAX_FIELD_WIDTH-1);
      if (default_value)
      {
	String str,*res;
	res=default_value->val_str(&str);
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	res->strip_sp();
	if (!find_type(interval, res->ptr(), res->length(), 0))
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	{
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	  net_printf(thd,ER_INVALID_DEFAULT,field_name);
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	  DBUG_RETURN(1);
	}
      }
      break;
    }
  }

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  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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  {
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    net_printf(thd,ER_TOO_BIG_FIELDLENGTH,field_name,
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	       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)
  {
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    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;
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  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)
{
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  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 */
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    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,
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					     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) ||
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      table->db.str && check_db_name(table->db.str))
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  {
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    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);
    }
4594
    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
  {
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    /* The following can't be "" as we may do 'casedn_str()' on it */
    ptr->db= empty_c_string;
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    ptr->db_length= 0;
  }
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  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;
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  ptr->real_name_length=table->table.length;
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  ptr->lock_type=   lock_type;
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  ptr->updating=    test(table_options & TL_OPTION_UPDATING);
  ptr->force_index= test(table_options & TL_OPTION_FORCE_INDEX);
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  ptr->ignore_leaves= test(table_options & TL_OPTION_IGNORE_LEAVES);
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  ptr->derived=	    table->sel;
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  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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  {
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    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)
{
4687
  if (expr)
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  {
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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();
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  }
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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;
}

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/*
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  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
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*/

4744 4745
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 */
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  bool tmp_write_to_binlog= 1;
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  if (options & REFRESH_GRANT)
  {
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    acl_reload(thd);
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    grant_reload(thd);
4755
    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)
  {
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    /*
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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).
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    */
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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)
    */
    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)
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	mysql_bin_log.purge_logs_before_date(purge_time);
4782
    }
4783
    pthread_mutex_lock(&LOCK_active_mi);
4784
    rotate_relay_log(active_mi);
4785
    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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  {
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    if ((options & REFRESH_READ_LOCK) && thd)
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    {
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      /*
	Writing to the binlog could cause deadlocks, as we don't log
	UNLOCK TABLES
      */
4815
      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)
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  {
    tmp_write_to_binlog= 0;
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    if (reset_master(thd))
      result=1;
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  }
4839
#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
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 if (options & REFRESH_SLAVE)
 {
4850
   tmp_write_to_binlog= 0;
4851
   pthread_mutex_lock(&LOCK_active_mi);
4852
   if (reset_slave(thd, active_mi))
4853
     result=1;
4854
   pthread_mutex_unlock(&LOCK_active_mi);
4855
 }
4856
#endif
4857
 if (options & REFRESH_USER_RESOURCES)
4858
   reset_mqh(thd,(LEX_USER *) NULL);
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 if (write_to_binlog)
   *write_to_binlog= tmp_write_to_binlog;
4861
 return result;
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}

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/*
  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
*/

4876
void kill_one_thread(THD *thd, ulong id)
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{
  THD *tmp;
  uint error=ER_NO_SUCH_THREAD;
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  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)
    {
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      pthread_mutex_lock(&tmp->LOCK_delete);	// Lock from delete
      break;
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    }
  }
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
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  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)
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    send_ok(thd);
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  else
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    net_printf(thd,error,id);
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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)
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      *(ulong*) ptr->value= 0;
    else if (ptr->type == SHOW_KEY_CACHE_LONG)
    {
      /*
	Reset value in 'default' key cache.
	This needs to be recoded when we have thread specific key values
      */
      char *value= (((char*) sql_key_cache) +
		    (uint) ((char*) (ptr->value) -
			    (char*) &dflt_key_cache_var));
      *(ulong*) value= 0;
    }
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  }
  pthread_mutex_unlock(&LOCK_status);
}
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	/* 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)
4939
{
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  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))
  {
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    my_error(ER_WRONG_TABLE_NAME, MYF(0), *filename_ptr);
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    return 1;
  }
  /* Fix is using unix filename format on dos */
  strmov(buff,*filename_ptr);
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  end=convert_dirname(buff, *filename_ptr, NullS);
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  if (!(ptr=thd->alloc((uint) (end-buff)+(uint) strlen(table_name)+1)))
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    return 1;					// End of memory
  *filename_ptr=ptr;
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  strxmov(ptr,buff,table_name,NullS);
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  return 0;
}
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/*
  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;
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  if (thd->lex->current_select != &thd->lex->select_lex)
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  {
    char command[80];
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    strmake(command, thd->lex->yylval->symbol.str,
	    min(thd->lex->yylval->symbol.length, sizeof(command)-1));
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    net_printf(thd, ER_CANT_USE_OPTION_HERE, command);
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    return 1;
  }
  return 0;
}
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Comp_creator *comp_eq_creator(bool invert)
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{
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  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=
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    new Item_allany_subselect(left_expr, (*cmp)(all), select_lex, all);
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  if (all)
    return it->upper_not= new Item_func_not_all(it);	/* ALL */

  return it;						/* ANY/SOME */
}
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/*
  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;
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  ALTER_INFO alter_info;
  alter_info.flags= ALTER_ADD_INDEX;
  alter_info.is_simple= 0;
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  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,
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				fields, keys, 0, (ORDER*)0,
				DUP_ERROR, &alter_info));
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}


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int mysql_drop_index(THD *thd, TABLE_LIST *table_list, ALTER_INFO *alter_info)
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{
  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;
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  alter_info->clear();
  alter_info->flags= ALTER_DROP_INDEX;
  alter_info->is_simple= 0;
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  DBUG_RETURN(mysql_alter_table(thd,table_list->db,table_list->real_name,
				&create_info, table_list,
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				fields, keys, 0, (ORDER*)0,
				DUP_ERROR, alter_info));
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}
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/*
  Multi update query pre-check

  SYNOPSIS
    multi_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 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)
  {
    if ((check_access(thd, UPDATE_ACL, table->db,
		      &table->grant.privilege, 0, 1) ||
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	 grant_option && check_grant(thd, UPDATE_ACL, table, 0, 1, 1)) &&
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	(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);
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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
    */
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    if (table->table_list)
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      table->table_list->table_in_update_from_clause= 1;
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  }
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  /*
    Is there tables of subqueries?
  */
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  if (&lex->select_lex != lex->all_selects_list)
  {
    for (table= tables; table; table= table->next)
    {
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      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;
      }
      else
      {
	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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*/
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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  }
  DBUG_RETURN(0);
}


/*
  INSERT ... SELECT query pre-check

  SYNOPSIS
    multi_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 insert_select_precheck(THD *thd, TABLE_LIST *tables)
{
  DBUG_ENTER("insert_select_precheck");
  /*
    Check that we have modify privileges for the first table and
    select privileges for the rest
  */
  ulong privilege= (thd->lex->duplicates == DUP_REPLACE ?
		    INSERT_ACL | DELETE_ACL : INSERT_ACL);
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  DBUG_RETURN(check_one_table_access(thd, privilege, tables) ? 1 : 0);
}


/*
  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, bool update)
{
  LEX *lex= thd->lex;
  DBUG_ENTER("insert_precheck");

  ulong privilege= (lex->duplicates == DUP_REPLACE ?
		    INSERT_ACL | DELETE_ACL : INSERT_ACL | update);

  if (check_one_table_access(thd, privilege, tables))
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    DBUG_RETURN(1);
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  if (lex->select_lex.item_list.elements != lex->value_list.elements)
  {
    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)
    -1  Error (message is not 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;
  DBUG_ENTER("create_table_precheck");
  ulong want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
		    CREATE_TMP_ACL : CREATE_ACL);
  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))
    DBUG_RETURN(1);
  DBUG_RETURN((grant_option && want_priv != CREATE_TMP_ACL &&
	       check_grant(thd, want_priv, create_table, 0, UINT_MAX, 0)) ?
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	      1 : 0);
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}