sql_parse.cc 127 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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extern int yyparse(void *thd);
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extern "C" pthread_mutex_t THR_LOCK_keycache;
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#ifdef SOLARIS
extern "C" int gethostname(char *name, int namelen);
#endif
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static int check_for_max_user_connections(THD *thd, USER_CONN *uc);
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static void decrease_user_connections(USER_CONN *uc);
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static bool check_db_used(THD *thd,TABLE_LIST *tables);
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static bool check_merge_table_access(THD *thd, char *db, 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, char **filename_ptr,
			       char *table_name);
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static bool single_table_command_access(THD *thd, ulong privilege,
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					TABLE_LIST *tables, int *res);

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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
  }
}

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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static HASH hash_user_connections;
extern  pthread_mutex_t LOCK_user_conn;

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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, host_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);
  host_len=strlen(host);
  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;
    if (hash_insert(&hash_user_connections, (byte*) uc))
    {
      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;
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 is ok
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  SYNOPSIS
    check_user()
    thd			Thread handle
    command		Command for connection (for log)
    user		Name of user trying to connect
    passwd		Scrambled password sent from client
    db			Database to connect to
    check_count		If set to 1, don't allow too many connection
    simple_connect	If 1 then client is of old type and we should connect
			using the old method (no challange)
    do_send_error	Set to 1 if we should send error to user
    prepared_scramble	Buffer to store hash password of new connection
    had_password	Set to 1 if the user gave a password
    cur_priv_version	Check flag to know if someone flushed the privileges
			since last code
    hint_user	        Pointer used by acl_getroot() to remmeber user for
			next call

  RETURN
    0		ok
		thd->user, thd->master_access, thd->priv_user, thd->db and
		thd->db_access are updated
    1		Access denied;  Error sent to client
    -1		If do_send_error == 1:  Failed connect, error sent to client
		If do_send_error == 0:	Prepare for stage of connect
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*/

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static int check_user(THD *thd,enum_server_command command, const char *user,
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		       const char *passwd, const char *db, bool check_count,
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                       bool simple_connect, bool do_send_error, 
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                       char *prepared_scramble, bool had_password,
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                       uint *cur_priv_version, ACL_USER** hint_user)
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{
  thd->db=0;
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  thd->db_length=0;
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  USER_RESOURCES ur;
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  char tmp_passwd[SCRAMBLE41_LENGTH];
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  DBUG_ENTER("check_user");
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  /*
    Move password to temporary buffer as it may be stored in communication
    buffer
  */
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  strmake(tmp_passwd, passwd, sizeof(tmp_passwd));
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  passwd= tmp_passwd;				// Use local copy
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  /* We shall avoid dupplicate user allocations here */
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  if (!thd->user && !(thd->user = my_strdup(user, MYF(0))))
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  {
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    send_error(thd,ER_OUT_OF_RESOURCES);
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    DBUG_RETURN(1);
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  }
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  thd->master_access=acl_getroot(thd, thd->host, thd->ip, thd->user,
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				 passwd, thd->scramble,
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				 &thd->priv_user, thd->priv_host,
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				 (protocol_version == 9 ||
				  !(thd->client_capabilities &
				    CLIENT_LONG_PASSWORD)),
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				 &ur,prepared_scramble,
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				 cur_priv_version,hint_user);
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  DBUG_PRINT("info",
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	     ("Capabilities: %d  packet_length: %ld  Host: '%s'  Login user: '%s'  Priv_user: '%s'  Using password: %s  Access: %u  db: '%s'",
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	      thd->client_capabilities, thd->max_client_packet_length,
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	      thd->host_or_ip, thd->user, thd->priv_user,
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	      had_password ? "yes": "no",
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	      thd->master_access, thd->db ? thd->db : "*none*"));
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  /*
    In case we're going to retry we should not send error message at this
    point
  */
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  if (thd->master_access & NO_ACCESS)
  {
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    if (do_send_error || !had_password || !*hint_user)
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    {
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      DBUG_PRINT("info",("Access denied"));
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      /*
	Old client should get nicer error message if password version is
	not supported
      */
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      if (simple_connect && *hint_user && (*hint_user)->pversion)
      {
        net_printf(thd, ER_NOT_SUPPORTED_AUTH_MODE);
        mysql_log.write(thd,COM_CONNECT,ER(ER_NOT_SUPPORTED_AUTH_MODE));
      }
      else
      {
        net_printf(thd, ER_ACCESS_DENIED_ERROR,
      	         thd->user,
	         thd->host_or_ip,
	         had_password ? ER(ER_YES) : ER(ER_NO));
        mysql_log.write(thd,COM_CONNECT,ER(ER_ACCESS_DENIED_ERROR),
	              thd->user,
                      thd->host_or_ip,
	              had_password ? ER(ER_YES) : ER(ER_NO));
      }                
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      DBUG_RETURN(1);			// Error already given
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    }
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    DBUG_PRINT("info",("Prepare for second part of handshake"));
    DBUG_RETURN(-1);			// no report error in special handshake
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  }
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  if (check_count)
  {
    VOID(pthread_mutex_lock(&LOCK_thread_count));
    bool tmp=(thread_count - delayed_insert_threads >= max_connections &&
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	      !(thd->master_access & SUPER_ACL));
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    VOID(pthread_mutex_unlock(&LOCK_thread_count));
    if (tmp)
    {						// Too many connections
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      send_error(thd, ER_CON_COUNT_ERROR);
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      DBUG_RETURN(1);
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    }
  }
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  mysql_log.write(thd,command,
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		  (thd->priv_user == thd->user ?
		   (char*) "%s@%s on %s" :
		   (char*) "%s@%s as anonymous on %s"),
		  user,
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		  thd->host_or_ip,
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		  db ? db : (char*) "");
  thd->db_access=0;
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  /* Don't allow user to connect if he has done too many queries */
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  if ((ur.questions || ur.updates || ur.connections) &&
      get_or_create_user_conn(thd,user,thd->host_or_ip,&ur))
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    DBUG_RETURN(1);
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  if (thd->user_connect && thd->user_connect->user_resources.connections &&
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      check_for_max_user_connections(thd, thd->user_connect))
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    DBUG_RETURN(1);
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  if (db && db[0])
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  {
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    int error= test(mysql_change_db(thd,db));
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    if (error && thd->user_connect)
      decrease_user_connections(thd->user_connect);
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    DBUG_RETURN(error);
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  }
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  send_ok(thd);					// Ready to handle questions
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  thd->password= test(passwd[0]);		// Remember for error messages
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  DBUG_RETURN(0);				// ok
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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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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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  if (max_user_connections &&
      (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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  uc->connections++;
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  if (uc->user_resources.connections &&
      uc->conn_per_hour++ >= uc->user_resources.connections)
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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;
  }
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end:
  DBUG_RETURN(error);
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}


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

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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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  (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);
      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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}
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/*
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  Check connnectionn and get priviliges

  SYNOPSIS
    check_connections
    thd		Thread handle

  RETURN
    0	ok
    -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  
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static int
check_connections(THD *thd)
{
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  int res;
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  uint connect_errors=0;
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  uint cur_priv_version;
  bool using_password;
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  NET *net= &thd->net;
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  char *end, *user, *passwd, *db;
  char prepared_scramble[SCRAMBLE41_LENGTH+4];  /* Buffer for scramble&hash */
  ACL_USER* cached_user=NULL; /* Initialise to NULL for first stage */
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  DBUG_PRINT("info",("New connection received on %s",
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		     vio_description(net->vio)));
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  /* Remove warning from valgrind.  TODO:  Fix it in password.c */
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  bzero((char*) &prepared_scramble[0], sizeof(prepared_scramble));
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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);
    if (!(thd->ip = my_strdup(ip,MYF(0))))
      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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      thd->host=(char*) localhost;
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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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  /* Ensure that wrong hostnames doesn't cause buffer overflows */
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  vio_keepalive(net->vio, TRUE);

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  ulong pkt_len=0;
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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;
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    int4store((uchar*) end,thd->thread_id);
    end+=4;
    memcpy(end,thd->scramble,SCRAMBLE_LENGTH+1);
    end+=SCRAMBLE_LENGTH +1;
    int2store(end,client_flags);
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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;
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    // At this point we write connection message and read reply
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    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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    if (!(thd->variables.character_set_client=
	  get_charset((uint) net->read_pos[8], MYF(0))))
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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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    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. */
    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"));
    if ((pkt_len=my_net_read(net)) == packet_error ||
	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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  }

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  user=   end;
  passwd= strend(user)+1;
  db=0;
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  using_password= test(passwd[0]);
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  if (thd->client_capabilities & CLIENT_CONNECT_WITH_DB)
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    db=strend(passwd)+1;
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  /* We can get only old hash at this point */
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  if (using_password && strlen(passwd) != SCRAMBLE_LENGTH)
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    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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  /* Simple connect only for old clients. New clients always use secure auth */
  bool simple_connect=(!(thd->client_capabilities & CLIENT_SECURE_CONNECTION));
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  /* Check user permissions. If password failure we'll get scramble back */
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  if ((res=check_user(thd, COM_CONNECT, user, passwd, db, 1, simple_connect,
		      simple_connect, prepared_scramble, using_password,
		      &cur_priv_version,
		      &cached_user)) < 0)
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  {
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    /* Store current used and database as they are erased with next packet */
    char tmp_user[USERNAME_LENGTH+1];
    char tmp_db[NAME_LEN+1];

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    /* If the client is old we just have to return error */
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    if (simple_connect)
      return -1;

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    DBUG_PRINT("info",("password challenge"));

    tmp_user[0]= tmp_db[0]= 0;
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    if (user)
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      strmake(tmp_user,user,USERNAME_LENGTH);
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    if (db)
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      strmake(tmp_db,db,NAME_LEN);

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    /* Write hash and encrypted scramble to client */
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    if (my_net_write(net,prepared_scramble,SCRAMBLE41_LENGTH+4) ||
        net_flush(net))
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    {
      inc_host_errors(&thd->remote.sin_addr);
      return ER_HANDSHAKE_ERROR;
    }
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    /* Reading packet back */
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    if ((pkt_len= my_net_read(net)) == packet_error)
    {
      inc_host_errors(&thd->remote.sin_addr);
      return ER_HANDSHAKE_ERROR;
    }
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    /* We have to get very specific packet size  */
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    if (pkt_len != SCRAMBLE41_LENGTH)
    {
      inc_host_errors(&thd->remote.sin_addr);
      return ER_HANDSHAKE_ERROR;
    }
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    /* Final attempt to check the user based on reply */
    if (check_user(thd,COM_CONNECT, tmp_user, (char*)net->read_pos,
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		   tmp_db, 1, 0, 1, prepared_scramble, using_password,
		   &cur_priv_version,
		   &cached_user))
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      return -1;
  }
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  else if (res)
    return -1;					// Error sent from check_user()
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  return 0;
}

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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;

    if ((error=check_connections(thd)))
    {						// 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->proc_info=0;				// Remove 'login'
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    thd->command=COM_SLEEP;
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    thd->version=refresh_version;
    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);
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    free_root(&thd->mem_root,MYF(0));
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    if (net->error && net->vio != 0 && net->report_error)
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    {
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      if (!thd->killed && thd->variables.log_warnings)
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	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);
    }
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end_thread:
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    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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/*
  Execute commands from bootstrap_file.
  Used when creating the initial grant tables
*/
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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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    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
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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");

  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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  if (thd->variables.max_join_size == HA_POS_ERROR)
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    thd->options |= OPTION_BIG_SELECTS;

  thd->proc_info=0;
  thd->version=refresh_version;
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  thd->priv_user=thd->user=(char*) my_strdup("boot", MYF(MY_WME));
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  buff= (char*) thd->net.buff;
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  thd->init_for_queries();
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  while (fgets(buff, thd->net.max_packet, file))
  {
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    uint length=(uint) strlen(buff);
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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;
    thd->current_tablenr=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));
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    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:
  (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);
  DBUG_RETURN(0);				// Never reached
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}

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#endif /* EMBEDDED_LIBRARY */

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

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;
1004
  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;
1007
  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;

1011 1012
  if (!db || check_db_name(db))
  {
1013
    net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
1014 1015
    goto err;
  }
1016
  if (lower_case_table_names)
1017
    my_casedn_str(files_charset_info, tbl_name);
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  remove_escape(table_list->real_name);
1019 1020 1021 1022

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

1023
  if (check_access(thd, SELECT_ACL, db, &table_list->grant.privilege))
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    goto err;
1025
  if (grant_option && check_grant(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;
1031 1032
  if ((error = mysqld_dump_create_info(thd, table, -1)))
  {
1033
    my_error(ER_GET_ERRNO, MYF(0), my_errno);
1034 1035
    goto err;
  }
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  net_flush(&thd->net);
1037
  if ((error= table->file->dump(thd,fd)))
1038
    my_error(ER_GET_ERRNO, MYF(0));
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err:
  close_thread_tables(thd);
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  DBUG_RETURN(error);
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}


1046
	/* Execute one command from socket (query or simple command) */
1047 1048

#ifndef EMBEDDED_LIBRARY
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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;
  thd->current_tablenr=0;
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  /*
    indicator of uninitialized lex => normal flow of errors handling
    (see my_message_sql)
  */
  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)
  {
1075 1076 1077 1078 1079
    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)
1080 1081
    {
      statistic_increment(aborted_threads,&LOCK_status);
1082
      DBUG_RETURN(TRUE);			// We have to close it.
1083
    }
1084
    send_error(thd,net->last_errno,NullS);
1085
    net->error= 0;
1086
    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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  DBUG_RETURN(dispatch_command(command,thd, packet+1, (uint) packet_length));
1100
}
1101
#endif  /* EMBEDDED_LIBRARY */
1102

1103

1104 1105 1106 1107
bool dispatch_command(enum enum_server_command command, THD *thd,
		      char* packet, uint packet_length)
{
  NET *net= &thd->net;
1108
  bool error= 0;
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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
  */
1113 1114 1115
  bool slow_command=FALSE;
  DBUG_ENTER("dispatch_command");

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  thd->command=command;
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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++;
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
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  thd->lex.select_lex.options=0;		// We store status here
1126
  switch (command) {
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  case COM_INIT_DB:
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    statistic_increment(com_stat[SQLCOM_CHANGE_DB],&LOCK_status);
1129
    if (!mysql_change_db(thd,packet))
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      mysql_log.write(thd,command,"%s",thd->db);
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    break;
1132
#ifndef EMBEDDED_LIBRARY
1133 1134
  case COM_REGISTER_SLAVE:
  {
1135
    if (!register_slave(thd, (uchar*)packet, packet_length))
1136
      send_ok(thd);
1137 1138
    break;
  }
1139
#endif
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  case COM_TABLE_DUMP:
    {
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      statistic_increment(com_other, &LOCK_status);
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      slow_command = TRUE;
1144 1145
      uint db_len = *(uchar*)packet;
      uint tbl_len = *(uchar*)(packet + db_len + 1);
1146
      char* db = thd->alloc(db_len + tbl_len + 2);
1147
      memcpy(db, packet + 1, db_len);
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      char* tbl_name = db + db_len;
      *tbl_name++ = 0;
1150
      memcpy(tbl_name, packet + db_len + 2, tbl_len);
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      tbl_name[tbl_len] = 0;
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      if (mysql_table_dump(thd, db, tbl_name, -1))
1153
	send_error(thd); // dump to NET
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      break;
    }
1156
#ifndef EMBEDDED_LIBRARY
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  case COM_CHANGE_USER:
  {
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    thd->change_user();
1160
    thd->clear_error();			// If errors from rollback
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    statistic_increment(com_other,&LOCK_status);
1163
    char *user=   (char*) packet;
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    char *passwd= strend(user)+1;
    char *db=     strend(passwd)+1;
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    /* Save user and privileges */
    uint save_master_access=thd->master_access;
    uint save_db_access=    thd->db_access;
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    uint save_db_length=    thd->db_length;
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    char *save_user=	    thd->user;
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    thd->user=NULL; /* Needed for check_user to allocate new user */
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    char *save_priv_user=   thd->priv_user;
    char *save_db=	    thd->db;
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    USER_CONN *save_uc=     thd->user_connect;
    bool simple_connect;
    bool using_password;
1178 1179 1180 1181 1182
    char prepared_scramble[SCRAMBLE41_LENGTH+4];/* Buffer for scramble,hash */
    char tmp_user[USERNAME_LENGTH+1];
    char tmp_db[NAME_LEN+1];
    ACL_USER* cached_user     ;                 /* Cached user */
    uint cur_priv_version;                      /* Cached grant version */
1183 1184
    int res;
    ulong pkt_len= 0;				/* Length of reply packet */
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    bzero((char*) prepared_scramble, sizeof(prepared_scramble));
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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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      goto restore_user_err;
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    /* Now we shall basically perform authentication again */
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     /* We can get only old hash at this point */
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    if (passwd[0] && strlen(passwd)!=SCRAMBLE_LENGTH)
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      goto restore_user_err;
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1198
    cached_user= NULL;
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    /* Simple connect only for old clients. New clients always use sec. auth*/
    simple_connect=(!(thd->client_capabilities & CLIENT_SECURE_CONNECTION));
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    /* Store information if we used password. passwd will be dammaged */
    using_password=test(passwd[0]);
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    if (simple_connect) /* Restore scramble for old clients */
      memcpy(thd->scramble,thd->old_scramble,9);

    /*
1210 1211
      Check user permissions. If password failure we'll get scramble back
      Do not retry if we already have sent error (result>0)
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    */
1213 1214 1215
    if ((res=check_user(thd,COM_CHANGE_USER, user, passwd, db, 0,
			simple_connect, simple_connect, prepared_scramble,
			using_password, &cur_priv_version, &cached_user)) < 0)
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    {
1217
      /* If the client is old we just have to have auth failure */
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      if (simple_connect)
1219
        goto restore_user;			/* Error is already reported */
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      /* Store current used and database as they are erased with next packet */
1222
      tmp_user[0]= tmp_db[0]= 0;
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      if (user)
1224
        strmake(tmp_user,user,USERNAME_LENGTH);
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      if (db)
1226 1227
        strmake(tmp_db,db,NAME_LEN);

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      /* Write hash and encrypted scramble to client */
1229 1230
      if (my_net_write(net,prepared_scramble,SCRAMBLE41_LENGTH+4) ||
          net_flush(net))
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        goto restore_user_err;
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      /* Reading packet back */
      if ((pkt_len=my_net_read(net)) == packet_error)
        goto restore_user_err;

      /* We have to get very specific packet size  */
1238
      if (pkt_len != SCRAMBLE41_LENGTH)
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        goto restore_user;
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      /* Final attempt to check the user based on reply */
1242
      if (check_user(thd,COM_CHANGE_USER, tmp_user, (char*) net->read_pos,
1243 1244
		     tmp_db, 0, 0, 1, prepared_scramble, using_password,
		     &cur_priv_version, &cached_user))
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        goto restore_user;
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    }
1247 1248 1249
    else if (res)
      goto restore_user;

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    /* Finally we've authenticated new user */
1251
    if (max_connections && save_uc)
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      decrease_user_connections(save_uc);
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    x_free((gptr) save_db);
    x_free((gptr) save_user);
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    thd->password=using_password;
    break;
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    /* Bad luck  we shall restore old user */
1259
restore_user_err:
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    send_error(thd, ER_UNKNOWN_COM_ERROR);
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1262
restore_user:
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    x_free(thd->user);
    thd->master_access=save_master_access;
    thd->db_access=save_db_access;
    thd->db=save_db;
    thd->db_length=save_db_length;
    thd->user=save_user;
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    thd->priv_user=save_priv_user;
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    break;
  }
1272
#endif /* EMBEDDED_LIBRARY */
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  case COM_EXECUTE:
  {
1275
    mysql_stmt_execute(thd, packet);
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    break;
  }
  case COM_LONG_DATA:
  {
1280
    mysql_stmt_get_longdata(thd, packet, packet_length);
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    break;
  }
  case COM_PREPARE:
  {
1285
    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;
  }
1293 1294 1295 1296 1297
  case COM_RESET_STMT:
  {
    mysql_stmt_reset(thd, packet);
    break;
  }
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  case COM_QUERY:
  {
1300 1301
    if (alloc_query(thd, packet, packet_length))
      break;					// fatal error is set
1302
    mysql_log.write(thd,command,"%s",thd->query);
1303
    DBUG_PRINT("query",("%-.4096s",thd->query));
1304
    mysql_parse(thd,thd->query, thd->query_length);
1305

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    while (!thd->killed && !thd->is_fatal_error && thd->lex.found_colon)
1307
    {
1308
      char *packet= thd->lex.found_colon;
1309 1310 1311 1312 1313 1314
      /* 
        Multiple queries exits, execute them individually
      */
      if (thd->lock || thd->open_tables || thd->derived_tables)
        close_thread_tables(thd);		

1315
      ulong length= thd->query_length-(ulong)(thd->lex.found_colon-thd->query);
1316 1317
      
      /* Remove garbage at start of query */
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      while (my_isspace(thd->charset(), *packet) && length > 0)
1319 1320 1321 1322 1323
      {
        packet++;
        length--;
      }
      thd->query_length= length;
1324 1325 1326 1327
      thd->query= packet;
      VOID(pthread_mutex_lock(&LOCK_thread_count));
      thd->query_id= query_id++;
      VOID(pthread_mutex_unlock(&LOCK_thread_count));
1328 1329 1330
      mysql_parse(thd, packet, length);
    }

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    if (!(specialflag & SPECIAL_NO_PRIOR))
      my_pthread_setprio(pthread_self(),WAIT_PRIOR);
    DBUG_PRINT("info",("query ready"));
    break;
  }
1336
  case COM_FIELD_LIST:				// This isn't actually needed
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#ifdef DONT_ALLOW_SHOW_COMMANDS
1338
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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    break;
#else
  {
1342 1343
    char *fields, *pend;
    String convname;
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    TABLE_LIST table_list;
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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))
    {
1349
      send_error(thd,ER_NO_DB_ERROR);
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      break;
    }
    thd->free_list=0;
1353 1354 1355 1356 1357
    pend= strend(packet);
    convname.copy(packet, pend-packet, 
		  thd->variables.character_set_client, system_charset_info);
    table_list.alias= table_list.real_name= convname.c_ptr();
    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;
1361
    mysql_log.write(thd,command,"%s %s",table_list.real_name,fields);
1362
    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

    if (check_access(thd,SELECT_ACL,table_list.db,&thd->col_access))
      break;
    table_list.grant.privilege=thd->col_access;
    if (grant_option && check_grant(thd,SELECT_ACL,&table_list,2))
      break;
    mysqld_list_fields(thd,&table_list,fields);
1372
    free_items(thd->free_list);
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    break;
  }
#endif
  case COM_QUIT:
1377
    /* We don't calculate statistics for this command */
1378
    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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      statistic_increment(com_stat[SQLCOM_CREATE_DB],&LOCK_status);
1386
      char *db=thd->strdup(packet);
1387
      // null test to handle EOM
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      if (!db || !strip_sp(db) || check_db_name(db))
1389
      {
1390
	net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
1391 1392
	break;
      }
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      if (check_access(thd,CREATE_ACL,db,0,1))
	break;
1395
      mysql_log.write(thd,command,packet);
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      mysql_create_db(thd,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);
1402
      char *db=thd->strdup(packet);
1403
      // null test to handle EOM
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      if (!db || !strip_sp(db) || check_db_name(db))
1405
      {
1406
	net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
1407 1408
	break;
      }
1409 1410
      if (check_access(thd,DROP_ACL,db,0,1))
	break;
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      if (thd->locked_tables || thd->active_transaction())
      {
1413
	send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
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	break;
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      }
1416
      mysql_log.write(thd,command,db);
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      mysql_rm_db(thd,db,0,0);
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      break;
    }
1420
#ifndef EMBEDDED_LIBRARY
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  case COM_BINLOG_DUMP:
    {
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      statistic_increment(com_other,&LOCK_status);
1424
      slow_command = TRUE;
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      if (check_global_access(thd, REPL_SLAVE_ACL))
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	break;
1427
      mysql_log.write(thd,command, 0);
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      ulong pos;
      ushort flags;
1431
      uint32 slave_server_id;
1432
      /* 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 */
1436
      kill_zombie_dump_threads(slave_server_id = uint4korr(packet+6));
1437
      thd->server_id = slave_server_id;
1438
      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;
    }
1445
#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;
1452
      mysql_log.write(thd,command,NullS);
1453 1454 1455 1456
      if (reload_acl_and_cache(thd, options, (TABLE_LIST*) 0, NULL))
        send_error(thd, 0);
      else
        send_ok(thd);
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      break;
    }
1459
#ifndef EMBEDDED_LIBRARY
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  case COM_SHUTDOWN:
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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 */
    DBUG_PRINT("quit",("Got shutdown command"));
1465
    mysql_log.write(thd,command,NullS);
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    send_eof(thd);
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#ifdef __WIN__
    sleep(1);					// must wait after eof()
#endif
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#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;
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#endif
#ifndef EMBEDDED_LIBRARY
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  case COM_STATISTICS:
  {
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    mysql_log.write(thd,command,NullS);
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    statistic_increment(com_stat[SQLCOM_SHOW_STATUS],&LOCK_status);
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    char buff[200];
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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
    if (lCurMemory)				// Using SAFEMALLOC
      sprintf(strend(buff), "  Memory in use: %ldK  Max memory used: %ldK",
	      (lCurMemory+1023L)/1024L,(lMaxMemory+1023L)/1024L);
 #endif
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    VOID(my_net_write(net, buff,(uint) strlen(buff)));
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    VOID(net_flush(net));
    break;
  }
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#endif
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  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;
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    mysql_log.write(thd,command,NullS);
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    mysqld_list_processes(thd,thd->master_access & PROCESS_ACL ? NullS :
			  thd->priv_user,0);
    break;
  case COM_PROCESS_KILL:
  {
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    statistic_increment(com_stat[SQLCOM_KILL],&LOCK_status);
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    ulong id=(ulong) uint4korr(packet);
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    kill_one_thread(thd,id);
    break;
  }
  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);
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    mysql_log.write(thd,command,NullS);
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    send_eof(thd);
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    break;
  case COM_SLEEP:
  case COM_CONNECT:				// Impossible here
  case COM_TIME:				// Impossible from client
  case COM_DELAYED_INSERT:
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  case COM_END:
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  default:
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    send_error(thd, ER_UNKNOWN_COM_ERROR);
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    break;
  }
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  if (thd->lock || thd->open_tables || thd->derived_tables)
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  {
    thd->proc_info="closing tables";
    close_thread_tables(thd);			/* Free tables */
  }

1546
  if (thd->is_fatal_error)
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    send_error(thd,0);				// End of memory ?
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  time_t start_of_query=thd->start_time;
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  thd->end_time();				// Set start time
1551

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

1557 1558
    if ((ulong) (thd->start_time - thd->time_after_lock) >
	thd->variables.long_query_time ||
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	((thd->lex.select_lex.options &
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	  (QUERY_NO_INDEX_USED | QUERY_NO_GOOD_INDEX_USED)) &&
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	 (specialflag & SPECIAL_LONG_LOG_FORMAT)))
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    {
      long_query_count++;
      mysql_slow_log.write(thd, thd->query, thd->query_length, start_of_query);
    }
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  }
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  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;
  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);
}

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/*
  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
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  /* Remove garbage at start and end of query */
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  while (my_isspace(thd->charset(),packet[0]) && packet_length > 0)
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  {
    packet++;
    packet_length--;
  }
  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 */
  if (!(thd->query= (char*) thd->memdup_w_gap((gptr) (packet),
					      packet_length,
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					      thd->db_length+2+
					      sizeof(ha_rows))))
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    return 1;
  thd->query[packet_length]=0;
  thd->query_length= packet_length;
  thd->packet.shrink(thd->variables.net_buffer_length);// Reclaim some memory

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

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  /*
    Reset warning count for each query that uses tables
    A better approach would be to reset this for any commands
    that is not a SHOW command or a select that only access local
    variables, but for now this is probably good enough.
  */
1646
  if (tables || &lex->select_lex != lex->all_selects_list)
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    mysql_reset_errors(thd);
  /*
    Save old warning count to be able to send to client how many warnings we
    got
  */
  thd->old_total_warn_count= thd->total_warn_count;

1654
#ifndef EMBEDDED_LIBRARY
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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
    */
    if (table_rules_on && tables && !tables_ok(thd,tables))
1662
      DBUG_VOID_RETURN;
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#ifndef TO_BE_DELETED
    /*
       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()
    */
1669 1670 1671
    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
1675
  }
1676
#endif /* EMBEDDED_LIBRARY */
1677
  /*
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    TODO: make derived tables processing 'inside' SELECT processing.
    TODO: solve problem with depended derived tables in subselects
1680
  */
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  if (lex->derived_tables)
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  {
1683 1684 1685
    for (SELECT_LEX *sl= lex->all_selects_list;
	 sl;
	 sl= sl->next_select_in_list())
1686
    {
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      for (TABLE_LIST *cursor= sl->get_table_list();
	   cursor;
	   cursor= cursor->next)
1690
      {
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	if (cursor->derived && (res=mysql_derived(thd, lex,
						  cursor->derived,
						  cursor)))
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	{
1695 1696 1697 1698
	  if (res < 0 || thd->net.report_error)
	    send_error(thd,thd->killed ? ER_SERVER_SHUTDOWN : 0);
	  DBUG_VOID_RETURN;
	}
1699 1700
      }
    }
1701
  }
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  if ((&lex->select_lex != lex->all_selects_list &&
1703
       lex->unit.create_total_list(thd, lex, &tables, 0)) 
1704
#ifdef HAVE_REPLICATION
1705
      ||
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      (table_rules_on && tables && thd->slave_thread &&
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       !tables_ok(thd,tables))
#endif
      )
1710
    DBUG_VOID_RETURN;
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  /*
    When option readonly is set deny operations which change tables.
    Except for the replication thread and the 'super' users.
  */
  if (opt_readonly &&
      !(thd->slave_thread || (thd->master_access & SUPER_ACL)) &&
      (uc_update_queries[lex->sql_command] > 0))
  {
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    send_error(thd, ER_CANT_UPDATE_WITH_READLOCK);
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    DBUG_VOID_RETURN;
  }
1723

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  statistic_increment(com_stat[lex->sql_command],&LOCK_status);
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  switch (lex->sql_command) {
  case SQLCOM_SELECT:
  {
1728
    select_result *result=lex->result;
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    if (tables)
    {
      res=check_table_access(thd,
			     lex->exchange ? SELECT_ACL | FILE_ACL :
			     SELECT_ACL,
			     tables);
    }
    else
      res=check_access(thd, lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL,
		       any_db);
    if (res)
    {
      res=0;
      break;					// Error message is given
    }

1745 1746 1747
    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 <
1749
	(ha_rows) unit->global_parameters->select_limit)
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      unit->select_limit_cnt= HA_POS_ERROR;		// no limit
    if (unit->select_limit_cnt == HA_POS_ERROR)
1752
      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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      {
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	if (!(result= new select_send()))
	{
	  send_error(thd, ER_OUT_OF_RESOURCES);
	  DBUG_VOID_RETURN;
	}
	else
	  thd->send_explain_fields(result);
1765
	fix_tables_pointers(lex->all_selects_list);
1766
	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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	result->send_eof();
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	thd->lock= save_lock;
      }
      else
      {
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	if (!result)
	{
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	  if (!(result=new select_send()))
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	  {
	    res= -1;
#ifdef DELETE_ITEMS
	    delete select_lex->having;
	    delete select_lex->where;
#endif
	    break;
	  }
	}
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	query_cache_store_query(thd, tables);
	res=handle_select(thd, lex, result);
      }
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    }
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    break;
  }
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  case SQLCOM_DO:
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    if (tables && ((res= check_table_access(thd, SELECT_ACL, tables)) ||
		   (res= open_and_lock_tables(thd,tables))))
	break;

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

1803
  case SQLCOM_EMPTY_QUERY:
1804
    send_ok(thd);
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    break;

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

1811
#ifndef EMBEDDED_LIBRARY
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  case SQLCOM_PURGE:
1813
  {
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    if (check_global_access(thd, SUPER_ACL))
1815
      goto error;
1816
    // PURGE MASTER LOGS TO 'file'
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    res = purge_master_logs(thd, lex->to_log);
    break;
  }
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  case SQLCOM_PURGE_BEFORE:
  {
    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;
  }
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#endif

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  case SQLCOM_SHOW_WARNS:
  {
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    res= mysqld_show_warnings(thd, (ulong)
			      ((1L << (uint) MYSQL_ERROR::WARN_LEVEL_NOTE) |
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			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_WARN) |
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR)
			       ));
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    break;
  }
  case SQLCOM_SHOW_ERRORS:
  {
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    res= mysqld_show_warnings(thd, (ulong)
			      (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR));
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    break;
  }
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  case SQLCOM_SHOW_NEW_MASTER:
  {
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    if (check_global_access(thd, REPL_SLAVE_ACL))
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      goto error;
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#ifndef WORKING_NEW_MASTER
1850
    net_printf(thd, ER_NOT_SUPPORTED_YET, "SHOW NEW MASTER");
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    res= 1;
#else
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    res = show_new_master(thd);
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#endif
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    break;
  }
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#ifndef EMBEDDED_LIBRARY
1859 1860
  case SQLCOM_SHOW_SLAVE_HOSTS:
  {
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    if (check_global_access(thd, REPL_SLAVE_ACL))
1862 1863 1864 1865
      goto error;
    res = show_slave_hosts(thd);
    break;
  }
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  case SQLCOM_SHOW_BINLOG_EVENTS:
  {
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    if (check_global_access(thd, REPL_SLAVE_ACL))
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      goto error;
    res = show_binlog_events(thd);
    break;
  }
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#endif

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  case SQLCOM_BACKUP_TABLE:
1876 1877 1878
  {
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL, tables) ||
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	check_global_access(thd, FILE_ACL))
1880 1881
      goto error; /* purecov: inspected */
    res = mysql_backup_table(thd, tables);
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1883 1884
    break;
  }
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  case SQLCOM_RESTORE_TABLE:
1886 1887
  {
    if (check_db_used(thd,tables) ||
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	check_table_access(thd, INSERT_ACL, tables) ||
	check_global_access(thd, FILE_ACL))
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      goto error; /* purecov: inspected */
    res = mysql_restore_table(thd, tables);
    break;
  }
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  case SQLCOM_PRELOAD_KEYS:
  {
    if (check_db_used(thd, tables) ||
        check_access(thd, INDEX_ACL, tables->db, &tables->grant.privilege))
      goto error; 
    res = mysql_preload_keys(thd, tables);
    break;
  }
      
1903 1904

#ifndef EMBEDDED_LIBRARY
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  case SQLCOM_CHANGE_MASTER:
1906
  {
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    if (check_global_access(thd, SUPER_ACL))
1908
      goto error;
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    LOCK_ACTIVE_MI;
    res = change_master(thd,active_mi);
    UNLOCK_ACTIVE_MI;
1912 1913
    break;
  }
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  case SQLCOM_SHOW_SLAVE_STAT:
1915
  {
1916 1917
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
1918
      goto error;
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    LOCK_ACTIVE_MI;
    res = show_master_info(thd,active_mi);
    UNLOCK_ACTIVE_MI;
1922 1923
    break;
  }
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  case SQLCOM_SHOW_MASTER_STAT:
1925
  {
1926 1927
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
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      goto error;
    res = show_binlog_info(thd);
    break;
  }
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1933
  case SQLCOM_LOAD_MASTER_DATA: // sync with master
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    if (check_global_access(thd, SUPER_ACL))
1935
      goto error;
1936 1937 1938 1939
    if (end_active_trans(thd))
      res= -1;
    else
      res = load_master_data(thd);
1940
    break;
1941
#endif /* EMBEDDED_LIBRARY */
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#ifdef HAVE_INNOBASE_DB
  case SQLCOM_SHOW_INNODB_STATUS:
    {
1946
      if (check_global_access(thd, SUPER_ACL))
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	goto error;
      res = innodb_show_status(thd);
      break;
    }
#endif
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1953
#ifndef EMBEDDED_LIBRARY
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  case SQLCOM_LOAD_MASTER_TABLE:
1955
  {
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    if (!tables->db)
      tables->db=thd->db;
    if (check_access(thd,CREATE_ACL,tables->db,&tables->grant.privilege))
      goto error;				/* purecov: inspected */
    if (grant_option)
    {
      /* Check that the first table has CREATE privilege */
      TABLE_LIST *tmp_table_list=tables->next;
      tables->next=0;
      bool error=check_grant(thd,CREATE_ACL,tables);
      tables->next=tmp_table_list;
      if (error)
1968
	goto error;
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    }
1970
    if (strlen(tables->real_name) > NAME_LEN)
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    {
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      net_printf(thd,ER_WRONG_TABLE_NAME,tables->real_name);
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      break;
    }
1975 1976 1977 1978 1979
    LOCK_ACTIVE_MI;
    // fetch_master_table will send the error to the client on failure
    if (!fetch_master_table(thd, tables->db, tables->real_name,
			    active_mi, 0))
    {
1980
      send_ok(thd);
1981 1982
    }
    UNLOCK_ACTIVE_MI;
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1983
    break;
1984
  }
1985 1986
#endif /* EMBEDDED_LIBRARY */

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  case SQLCOM_CREATE_TABLE:
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  {
    ulong want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
		      CREATE_TMP_ACL : CREATE_ACL);
1991 1992
    if (!tables->db)
      tables->db=thd->db;
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    if (check_access(thd,want_priv,tables->db,&tables->grant.privilege) ||
1994 1995 1996
	check_merge_table_access(thd, tables->db,
				 (TABLE_LIST *)
				 lex->create_info.merge_list.first))
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      goto error;				/* purecov: inspected */
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    if (grant_option && want_priv != CREATE_TMP_ACL)
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    {
      /* Check that the first table has CREATE privilege */
      TABLE_LIST *tmp_table_list=tables->next;
      tables->next=0;
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      bool error=check_grant(thd, want_priv, tables);
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2004 2005 2006 2007
      tables->next=tmp_table_list;
      if (error)
	goto error;
    }
2008
    if (strlen(tables->real_name) > NAME_LEN)
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2009
    {
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      net_printf(thd, ER_WRONG_TABLE_NAME, tables->alias);
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      res=0;
      break;
    }
2014 2015 2016
#ifndef HAVE_READLINK
    lex->create_info.data_file_name=lex->create_info.index_file_name=0;
#else
2017
    /* Fix names if symlinked tables */
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    if (append_file_to_dir(thd, &lex->create_info.data_file_name,
2019
			   tables->real_name) ||
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	append_file_to_dir(thd,&lex->create_info.index_file_name,
2021
			   tables->real_name))
2022 2023 2024 2025
    {
      res=-1;
      break;
    }
2026
#endif
2027
    if (select_lex->item_list.elements)		// With select
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2028 2029 2030 2031
    {
      select_result *result;

      if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
2032
	  find_real_table_in_list(tables->next, tables->db, tables->real_name))
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2033
      {
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	net_printf(thd,ER_UPDATE_TABLE_USED,tables->real_name);
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2035 2036 2037 2038 2039 2040 2041
	DBUG_VOID_RETURN;
      }
      if (tables->next)
      {
	if (check_table_access(thd, SELECT_ACL, tables->next))
	  goto error;				// Error message is given
      }
2042
      select_lex->options|= SELECT_NO_UNLOCK;
2043 2044 2045 2046 2047
      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
2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063

      /* Skip first table, which is the table we are creating */
      lex->select_lex.table_list.first=
	(byte*) (((TABLE_LIST *) lex->select_lex.table_list.first)->next);
      if (!(res=open_and_lock_tables(thd,tables->next)))
      {
        if ((result=new select_create(tables->db ? tables->db : thd->db,
                                      tables->real_name, &lex->create_info,
                                      lex->create_list,
                                      lex->key_list,
                                      select_lex->item_list,lex->duplicates)))
          res=handle_select(thd, lex, result);
	else
	  res= -1;
      }
    }
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2064 2065
    else // regular create
    {
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      if (lex->name)
        res= mysql_create_like_table(thd, tables, &lex->create_info, 
                                     (Table_ident *)lex->name); 
      else
        res= mysql_create_table(thd,tables->db ? tables->db : thd->db,
			         tables->real_name, &lex->create_info,
			         lex->create_list,
			         lex->key_list,0,0,0); // do logging
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      if (!res)
2075
	send_ok(thd);
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    }
    break;
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  }
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  case SQLCOM_CREATE_INDEX:
    if (!tables->db)
      tables->db=thd->db;
    if (check_access(thd,INDEX_ACL,tables->db,&tables->grant.privilege))
      goto error; /* purecov: inspected */
    if (grant_option && check_grant(thd,INDEX_ACL,tables))
      goto error;
2086 2087 2088 2089
    if (end_active_trans(thd))
      res= -1;
    else
      res = mysql_create_index(thd, tables, lex->key_list);
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    break;

2092
#ifndef EMBEDDED_LIBRARY
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2093
  case SQLCOM_SLAVE_START:
2094 2095 2096 2097
  {
    LOCK_ACTIVE_MI;
    start_slave(thd,active_mi,1 /* net report*/);
    UNLOCK_ACTIVE_MI;
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    break;
2099
  }
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2100
  case SQLCOM_SLAVE_STOP:
2101 2102 2103 2104 2105 2106
  /*
    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,
2107
      so it waits for the client thread because t is locked by it.
2108
    - then the client thread does SLAVE STOP.
2109 2110
      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.
2111 2112 2113 2114 2115
    To prevent that, refuse SLAVE STOP if the
    client thread has locked tables
  */
  if (thd->locked_tables || thd->active_transaction())
  {
2116
    send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
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2117
    break;
2118
  }
2119 2120 2121 2122
  {
    LOCK_ACTIVE_MI;
    stop_slave(thd,active_mi,1/* net report*/);
    UNLOCK_ACTIVE_MI;
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    break;
2124
  }
2125 2126
#endif

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  case SQLCOM_ALTER_TABLE:
#if defined(DONT_ALLOW_SHOW_COMMANDS)
2129
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
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    break;
#else
    {
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      ulong priv=0;
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      if (lex->name && (!lex->name[0] || strlen(lex->name) > NAME_LEN))
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      {
2136
	net_printf(thd,ER_WRONG_TABLE_NAME,lex->name);
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2137 2138 2139
	res=0;
	break;
      }
2140 2141
      if (!tables->db)
	tables->db=thd->db;
2142 2143
      if (!select_lex->db)
	select_lex->db=tables->db;
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2144
      if (check_access(thd,ALTER_ACL,tables->db,&tables->grant.privilege) ||
2145
	  check_access(thd,INSERT_ACL | CREATE_ACL,select_lex->db,&priv) ||
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	  check_merge_table_access(thd, tables->db,
2147 2148 2149
				   (TABLE_LIST *)
				   lex->create_info.merge_list.first))
	goto error;				/* purecov: inspected */
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2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160
      if (!tables->db)
	tables->db=thd->db;
      if (grant_option)
      {
	if (check_grant(thd,ALTER_ACL,tables))
	  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;
2161
	  tmp_table.db=select_lex->db;
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2162 2163 2164 2165 2166
	  tmp_table.grant.privilege=priv;
	  if (check_grant(thd,INSERT_ACL | CREATE_ACL,tables))
	    goto error;
	}
      }
2167 2168
      /* 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 */
2170
      if (end_active_trans(thd))
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2171 2172
	res= -1;
      else
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2173
      {
2174
	res= mysql_alter_table(thd, select_lex->db, lex->name,
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2175 2176 2177
			       &lex->create_info,
			       tables, lex->create_list,
			       lex->key_list, lex->drop_list, lex->alter_list,
2178
			       select_lex->order_list.elements,
2179
                               (ORDER *) select_lex->order_list.first,
2180 2181
			       lex->drop_primary, lex->duplicates,
			       lex->alter_keys_onoff, lex->simple_alter);
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2182
      }
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2183 2184 2185
      break;
    }
#endif
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2186
  case SQLCOM_RENAME_TABLE:
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2187 2188 2189
  {
    TABLE_LIST *table;
    if (check_db_used(thd,tables))
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2190
      goto error;
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2191 2192
    for (table=tables ; table ; table=table->next->next)
    {
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2193 2194
      if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
		       &table->grant.privilege) ||
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2195 2196 2197 2198 2199
	  check_access(thd, INSERT_ACL | CREATE_ACL, table->next->db,
		       &table->next->grant.privilege))
	goto error;
      if (grant_option)
      {
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2200 2201 2202 2203 2204
	TABLE_LIST old_list,new_list;
	old_list=table[0];
	new_list=table->next[0];
	old_list.next=new_list.next=0;
	if (check_grant(thd,ALTER_ACL,&old_list) ||
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2205
	    (!test_all_bits(table->next->grant.privilege,
2206
			    INSERT_ACL | CREATE_ACL) &&
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2207
	     check_grant(thd,INSERT_ACL | CREATE_ACL, &new_list)))
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	  goto error;
      }
    }
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    query_cache_invalidate3(thd, tables, 0);
2212 2213 2214
    if (end_active_trans(thd))
      res= -1;
    else if (mysql_rename_tables(thd,tables))
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2215 2216
      res= -1;
    break;
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2217
  }
2218
#ifndef EMBEDDED_LIBRARY
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2219 2220
  case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2221
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
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2222 2223 2224
    DBUG_VOID_RETURN;
#else
    {
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2225
      if (check_global_access(thd, SUPER_ACL))
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2226 2227 2228 2229
	goto error;
      res = show_binlogs(thd);
      break;
    }
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2230
#endif
2231
#endif /* EMBEDDED_LIBRARY */
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2232
  case SQLCOM_SHOW_CREATE:
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2233
#ifdef DONT_ALLOW_SHOW_COMMANDS
2234
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
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2235 2236
    DBUG_VOID_RETURN;
#else
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2237
    {
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2238 2239 2240 2241
      if (check_db_used(thd, tables) ||
	  check_access(thd, SELECT_ACL | EXTRA_ACL, tables->db,
		       &tables->grant.privilege))
	goto error;
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2242
      res = mysqld_show_create(thd, tables);
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      break;
    }
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#endif
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2246
  case SQLCOM_REPAIR:
2247 2248 2249 2250 2251
  {
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables))
      goto error; /* purecov: inspected */
    res = mysql_repair_table(thd, tables, &lex->check_opt);
2252 2253 2254 2255 2256 2257 2258 2259 2260 2261
    /* ! 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);
      }
    }
2262 2263
    break;
  }
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  case SQLCOM_CHECK:
2265 2266 2267 2268 2269 2270 2271
  {
    if (check_db_used(thd,tables) ||
	check_table_access(thd, SELECT_ACL | EXTRA_ACL , tables))
      goto error; /* purecov: inspected */
    res = mysql_check_table(thd, tables, &lex->check_opt);
    break;
  }
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2272 2273
  case SQLCOM_ANALYZE:
  {
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2274 2275
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables))
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      goto error; /* purecov: inspected */
2277
    res = mysql_analyze_table(thd, tables, &lex->check_opt);
2278 2279 2280 2281 2282 2283 2284 2285 2286 2287
    /* ! 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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2289
  }
2290

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2291 2292 2293
  case SQLCOM_OPTIMIZE:
  {
    HA_CREATE_INFO create_info;
2294 2295
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables))
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      goto error; /* purecov: inspected */
2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307
    if (specialflag & (SPECIAL_SAFE_MODE | SPECIAL_NO_NEW_FUNC))
    {
      /* Use ALTER TABLE */
      lex->create_list.empty();
      lex->key_list.empty();
      lex->col_list.empty();
      lex->drop_list.empty();
      lex->alter_list.empty();
      bzero((char*) &create_info,sizeof(create_info));
      create_info.db_type=DB_TYPE_DEFAULT;
      create_info.row_type=ROW_TYPE_DEFAULT;
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      create_info.table_charset=default_charset_info;
2309 2310 2311
      res= mysql_alter_table(thd, NullS, NullS, &create_info,
			     tables, lex->create_list,
			     lex->key_list, lex->drop_list, lex->alter_list,
2312 2313
                             0, (ORDER *) 0,
			     0, DUP_ERROR);
2314 2315 2316
    }
    else
      res = mysql_optimize_table(thd, tables, &lex->check_opt);
2317 2318 2319 2320 2321 2322 2323 2324 2325 2326
    /* ! 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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2327 2328 2329
    break;
  }
  case SQLCOM_UPDATE:
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2330
    if (check_db_used(thd,tables))
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      goto error;
2332

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    if (single_table_command_access(thd, UPDATE_ACL, tables, &res))
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2334
	goto error;
2335

2336
    if (select_lex->item_list.elements != lex->value_list.elements)
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2337
    {
2338
      send_error(thd,ER_WRONG_VALUE_COUNT);
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2339 2340
      DBUG_VOID_RETURN;
    }
2341 2342 2343 2344
    res= mysql_update(thd,tables,
                      select_lex->item_list,
                      lex->value_list,
                      select_lex->where,
2345
		      select_lex->order_list.elements,
2346 2347 2348
                      (ORDER *) select_lex->order_list.first,
                      select_lex->select_limit,
                      lex->duplicates);
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2349 2350
    if (thd->net.report_error)
      res= -1;
2351 2352 2353 2354 2355 2356 2357
    break;
  case SQLCOM_UPDATE_MULTI:
    if (check_access(thd,UPDATE_ACL,tables->db,&tables->grant.privilege))
      goto error;
    if (grant_option && check_grant(thd,UPDATE_ACL,tables))
      goto error;
    if (select_lex->item_list.elements != lex->value_list.elements)
2358
    {
2359 2360
      send_error(thd,ER_WRONG_VALUE_COUNT);
      DBUG_VOID_RETURN;
2361 2362
    }
    {
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      const char *msg= 0;
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      if (select_lex->order_list.elements)
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	msg= "ORDER BY";
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      else if (select_lex->select_limit && select_lex->select_limit !=
	       HA_POS_ERROR)
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2368
	msg= "LIMIT";
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2369
      if (msg)
2370
      {
2371
	net_printf(thd, ER_WRONG_USAGE, "UPDATE", msg);
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2372 2373
	res= 1;
	break;
2374
      }
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2375 2376 2377 2378 2379
      res= mysql_multi_update(thd,tables,
			      &select_lex->item_list,
			      &lex->value_list,
			      select_lex->where,
			      select_lex->options,
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2380
			      lex->duplicates, unit, select_lex);
2381
    }
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    break;
  case SQLCOM_REPLACE:
2384 2385
  case SQLCOM_INSERT:
  {
2386
    my_bool update=(lex->value_list.elements ? UPDATE_ACL : 0);
2387
    ulong privilege= (lex->duplicates == DUP_REPLACE ?
2388
                      INSERT_ACL | DELETE_ACL : INSERT_ACL | update);
2389

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2390
    if (single_table_command_access(thd, privilege, tables, &res))
2391 2392
	goto error;

2393 2394 2395 2396 2397
    if (select_lex->item_list.elements != lex->value_list.elements)
    {
      send_error(thd,ER_WRONG_VALUE_COUNT);
      DBUG_VOID_RETURN;
    }
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    res = mysql_insert(thd,tables,lex->field_list,lex->many_values,
2399
                       select_lex->item_list, lex->value_list,
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2400
                       (update ? DUP_UPDATE : lex->duplicates));
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2401 2402
    if (thd->net.report_error)
      res= -1;
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    break;
2404
  }
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  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
  {
2408

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    /*
      Check that we have modify privileges for the first table and
      select privileges for the rest
    */
2413
    {
2414 2415
      ulong privilege= (lex->duplicates == DUP_REPLACE ?
                        INSERT_ACL | DELETE_ACL : INSERT_ACL);
2416 2417 2418 2419 2420 2421 2422 2423 2424 2425
      TABLE_LIST *save_next=tables->next;
      tables->next=0;
      if (check_access(thd, privilege,
		       tables->db,&tables->grant.privilege) ||
	  (grant_option && check_grant(thd, privilege, tables)))
	goto error;
      tables->next=save_next;
      if ((res=check_table_access(thd, SELECT_ACL, save_next)))
	goto error;
    }
2426 2427
    /* Don't unlock tables until command is written to binary log */
    select_lex->options|= SELECT_NO_UNLOCK;
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2428 2429

    select_result *result;
2430 2431 2432 2433
    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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2435
    if (find_real_table_in_list(tables->next, tables->db, tables->real_name))
2436
    {
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      net_printf(thd,ER_UPDATE_TABLE_USED,tables->real_name);
2438
      DBUG_VOID_RETURN;
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    }
2440 2441 2442 2443 2444 2445 2446

    /* Skip first table, which is the table we are inserting in */
    lex->select_lex.table_list.first=
      (byte*) (((TABLE_LIST *) lex->select_lex.table_list.first)->next);
    if (!(res=open_and_lock_tables(thd, tables)))
    {
      if ((result=new select_insert(tables->table,&lex->field_list,
2447
				    lex->duplicates)))
2448
	res=handle_select(thd,lex,result);
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2449 2450
      if (thd->net.report_error)
	res= -1;
2451 2452 2453
    }
    else
      res= -1;
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    break;
  }
2456
  case SQLCOM_TRUNCATE:
2457 2458
    if (check_access(thd,DELETE_ACL,tables->db,&tables->grant.privilege))
      goto error; /* purecov: inspected */
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    if (grant_option && check_grant(thd,DELETE_ACL,tables))
      goto error;
2461 2462 2463 2464 2465 2466
    /*
      Don't allow this within a transaction because we want to use
      re-generate table
    */
    if (thd->locked_tables || thd->active_transaction())
    {
2467
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION,NullS);
2468 2469 2470 2471
      goto error;
    }
    res=mysql_truncate(thd,tables);
    break;
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  case SQLCOM_DELETE:
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  {
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    if (single_table_command_access(thd, DELETE_ACL, tables, &res))
      goto error;
2476

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    // Set privilege for the WHERE clause
    tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
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    res = mysql_delete(thd,tables, select_lex->where,
                       (ORDER*) select_lex->order_list.first,
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                       select_lex->select_limit, select_lex->options);
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    if (thd->net.report_error)
      res= -1;
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    break;
  }
2486
  case SQLCOM_DELETE_MULTI:
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  {
    TABLE_LIST *aux_tables=(TABLE_LIST *)thd->lex.auxilliary_table_list.first;
    TABLE_LIST *auxi;
    uint table_count=0;
    multi_delete *result;
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    /* sql_yacc guarantees that tables and aux_tables are not zero */
    if (check_db_used(thd, tables) || check_db_used(thd,aux_tables) ||
2495
	check_table_access(thd,SELECT_ACL, tables) ||
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	check_table_access(thd,DELETE_ACL, aux_tables))
      goto error;
    if ((thd->options & OPTION_SAFE_UPDATES) && !select_lex->where)
2499
    {
2500
      send_error(thd,ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE);
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      goto error;
    }
    for (auxi=(TABLE_LIST*) aux_tables ; auxi ; auxi=auxi->next)
    {
      table_count++;
      /* All tables in aux_tables must be found in FROM PART */
      TABLE_LIST *walk;
      for (walk=(TABLE_LIST*) tables ; walk ; walk=walk->next)
      {
	if (!strcmp(auxi->real_name,walk->real_name) &&
	    !strcmp(walk->db,auxi->db))
	  break;
      }
      if (!walk)
      {
2516
	net_printf(thd,ER_NONUNIQ_TABLE,auxi->real_name);
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	goto error;
      }
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      walk->lock_type= auxi->lock_type;
2520
      auxi->table_list=  walk;		// Remember corresponding table
2521
    }
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    if (add_item_to_list(thd, new Item_null()))
2523
    {
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      res= -1;
2525
      break;
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    }
    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 */
    for (auxi=(TABLE_LIST*) aux_tables ; auxi ; auxi=auxi->next)
2532
      auxi->table= auxi->table_list->table;
2533
    if (&lex->select_lex != lex->all_selects_list)
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    {
2535 2536 2537 2538 2539
      for (TABLE_LIST *t= select_lex->get_table_list();
	   t; t= t->next)
      {
	if (find_real_table_in_list(t->table_list->next, t->db, t->real_name))
	{
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	  my_error(ER_UPDATE_TABLE_USED, MYF(0), t->real_name);
2541 2542 2543 2544
	  res= -1;
	  break;
	}
      }
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    }
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    fix_tables_pointers(lex->all_selects_list);
2547 2548
    if (!thd->is_fatal_error && (result= new multi_delete(thd,aux_tables,
							  table_count)))
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    {
2550 2551 2552
      res= mysql_select(thd, &select_lex->ref_pointer_array,
			select_lex->get_table_list(),
			select_lex->with_wild,
2553
			select_lex->item_list,
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			select_lex->where,
2555
			0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
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			(ORDER *)NULL,
			select_lex->options | thd->options |
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			SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK,
2559
			result, unit, select_lex, 0);
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      if (thd->net.report_error)
	res= -1;
2562
      delete result;
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    }
    else
      res= -1;					// Error is not sent
    close_thread_tables(thd);
    break;
  }
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  case SQLCOM_DROP_TABLE:
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  {
2571 2572 2573 2574 2575 2576 2577 2578 2579 2580
    if (!lex->drop_temporary)
    {
      if (check_table_access(thd,DROP_ACL,tables))
	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.
	To not generate such irrelevant "table does not exist errors", we
	silently add IF EXISTS if TEMPORARY was used.
      */
      if (thd->slave_thread)
	lex->drop_if_exists= 1;
    }
2594
    res= mysql_rm_table(thd,tables,lex->drop_if_exists, lex->drop_temporary);
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  }
  break;
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  case SQLCOM_DROP_INDEX:
    if (!tables->db)
      tables->db=thd->db;
    if (check_access(thd,INDEX_ACL,tables->db,&tables->grant.privilege))
      goto error;				/* purecov: inspected */
    if (grant_option && check_grant(thd,INDEX_ACL,tables))
      goto error;
2604 2605 2606 2607
    if (end_active_trans(thd))
      res= -1;
    else
      res = mysql_drop_index(thd, tables, lex->drop_list);
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    break;
  case SQLCOM_SHOW_DATABASES:
2610
#if defined(DONT_ALLOW_SHOW_COMMANDS)
2611
    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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	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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    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
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      break;
    mysqld_list_processes(thd,thd->master_access & PROCESS_ACL ? NullS :
			  thd->priv_user,lex->verbose);
    break;
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  case SQLCOM_SHOW_TABLE_TYPES:
    res= mysqld_show_table_types(thd);
    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:
2636
    res= mysqld_show(thd,(lex->wild ? lex->wild->ptr() : NullS),status_vars,
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		     OPT_GLOBAL);
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    break;
  case SQLCOM_SHOW_VARIABLES:
    res= mysqld_show(thd, (lex->wild ? lex->wild->ptr() : NullS),
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		     init_vars, lex->option_type);
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    break;
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  case SQLCOM_SHOW_LOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2645
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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    DBUG_VOID_RETURN;
#else
    {
      if (grant_option && check_access(thd, FILE_ACL, any_db))
	goto error;
      res= mysqld_show_logs(thd);
      break;
    }
#endif
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  case SQLCOM_SHOW_TABLES:
2656
    /* FALL THROUGH */
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#ifdef DONT_ALLOW_SHOW_COMMANDS
2658
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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    DBUG_VOID_RETURN;
#else
    {
2662
      char *db=select_lex->db ? select_lex->db : thd->db;
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      if (!db)
      {
2665
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
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	goto error;				/* purecov: inspected */
      }
      remove_escape(db);				// Fix escaped '_'
2669
      if (check_db_name(db))
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      {
2671
        net_printf(thd,ER_WRONG_DB_NAME, db);
2672
        goto error;
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      }
      if (check_access(thd,SELECT_ACL,db,&thd->col_access))
	goto error;				/* purecov: inspected */
      /* grant is checked in mysqld_show_tables */
2677
      if (select_lex->options & SELECT_DESCRIBE)
2678
        res= mysqld_extend_show_tables(thd,db,
2679
				       (lex->wild ? lex->wild->ptr() : NullS));
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      else
	res= mysqld_show_tables(thd,db,
				(lex->wild ? lex->wild->ptr() : NullS));
      break;
    }
#endif
2686 2687 2688
  case SQLCOM_SHOW_OPEN_TABLES:
    res= mysqld_show_open_tables(thd,(lex->wild ? lex->wild->ptr() : NullS));
    break;
2689 2690
  case SQLCOM_SHOW_CHARSETS:
    res= mysqld_show_charsets(thd,(lex->wild ? lex->wild->ptr() : NullS));
2691
    break;
2692 2693 2694
  case SQLCOM_SHOW_COLLATIONS:
    res= mysqld_show_collations(thd,(lex->wild ? lex->wild->ptr() : NullS));
    break;
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  case SQLCOM_SHOW_FIELDS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2697
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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    DBUG_VOID_RETURN;
#else
    {
2701 2702
      char *db=tables->db;
      if (!*db)
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      {
2704
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
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	goto error;				/* purecov: inspected */
      }
      remove_escape(db);			// Fix escaped '_'
2708
      remove_escape(tables->real_name);
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      if (check_access(thd,SELECT_ACL | EXTRA_ACL,db,&thd->col_access))
	goto error;				/* purecov: inspected */
      tables->grant.privilege=thd->col_access;
      if (grant_option && check_grant(thd,SELECT_ACL,tables,2))
	goto error;
      res= mysqld_show_fields(thd,tables,
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			      (lex->wild ? lex->wild->ptr() : NullS),
			      lex->verbose);
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      break;
    }
#endif
  case SQLCOM_SHOW_KEYS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2722
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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    DBUG_VOID_RETURN;
#else
    {
2726
      char *db=tables->db;
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      if (!db)
      {
2729
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
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	goto error;				/* purecov: inspected */
      }
      remove_escape(db);			// Fix escaped '_'
2733
      remove_escape(tables->real_name);
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      if (!tables->db)
	tables->db=thd->db;
      if (check_access(thd,SELECT_ACL,db,&thd->col_access))
	goto error; /* purecov: inspected */
      tables->grant.privilege=thd->col_access;
      if (grant_option && check_grant(thd,SELECT_ACL,tables,2))
	goto error;
      res= mysqld_show_keys(thd,tables);
      break;
    }
#endif
  case SQLCOM_CHANGE_DB:
2746
    mysql_change_db(thd,select_lex->db);
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    break;
2748
#ifndef EMBEDDED_LIBRARY
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  case SQLCOM_LOAD:
  {
    uint privilege= (lex->duplicates == DUP_REPLACE ?
2752
		     INSERT_ACL | DELETE_ACL : INSERT_ACL);
2753 2754

    if (!lex->local_file)
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    {
      if (check_access(thd,privilege | FILE_ACL,tables->db))
	goto error;
    }
    else
    {
2761
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
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2762
	  ! opt_local_infile)
2763
      {
2764
	send_error(thd,ER_NOT_ALLOWED_COMMAND);
2765 2766
	goto error;
      }
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      if (check_access(thd,privilege,tables->db,&tables->grant.privilege) ||
2768
	  grant_option && check_grant(thd,privilege,tables))
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	goto error;
    }
    res=mysql_load(thd, lex->exchange, tables, lex->field_list,
		   lex->duplicates, (bool) lex->local_file, lex->lock_option);
    break;
  }
2775
#endif /* EMBEDDED_LIBRARY */
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  case SQLCOM_SET_OPTION:
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    if (tables && ((res= check_table_access(thd, SELECT_ACL, tables)) ||
		   (res= open_and_lock_tables(thd,tables))))
      break;
    fix_tables_pointers(lex->all_selects_list);
    if (!(res= sql_set_variables(thd, &lex->var_list)))
2782
      send_ok(thd);
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    if (thd->net.report_error)
      res= -1;
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    break;
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  case SQLCOM_UNLOCK_TABLES:
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    unlock_locked_tables(thd);
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    if (thd->options & OPTION_TABLE_LOCK)
    {
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      end_active_trans(thd);
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      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
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    }
    if (thd->global_read_lock)
2795
      unlock_global_read_lock(thd);
2796
    send_ok(thd);
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    break;
  case SQLCOM_LOCK_TABLES:
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    unlock_locked_tables(thd);
2800
    if (check_db_used(thd,tables) || end_active_trans(thd))
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      goto error;
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    if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, tables))
2803
      goto error;
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    thd->in_lock_tables=1;
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    thd->options|= OPTION_TABLE_LOCK;
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    if (!(res=open_and_lock_tables(thd,tables)))
    {
      thd->locked_tables=thd->lock;
      thd->lock=0;
2810
      send_ok(thd);
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    }
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    else
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
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    thd->in_lock_tables=0;
    break;
  case SQLCOM_CREATE_DB:
2817
  {
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    if (!strip_sp(lex->name) || check_db_name(lex->name))
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    {
2820
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
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      break;
    }
2823 2824 2825 2826 2827 2828 2829
    /*
      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.
    */
2830
#ifdef HAVE_REPLICATION
2831 2832 2833 2834
    if (thd->slave_thread && 
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
      break;
2835
#endif
2836 2837
    if (check_access(thd,CREATE_ACL,lex->name,0,1))
      break;
2838
    res=mysql_create_db(thd,lex->name,&lex->create_info,0);
2839 2840
    break;
  }
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  case SQLCOM_DROP_DB:
2842
  {
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2843
    if (!strip_sp(lex->name) || check_db_name(lex->name))
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    {
2845
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
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      break;
    }
2848 2849 2850 2851 2852 2853 2854
    /*
      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.
    */
2855
#ifdef HAVE_REPLICATION
2856 2857 2858 2859
    if (thd->slave_thread && 
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
      break;
2860
#endif
2861
    if (check_access(thd,DROP_ACL,lex->name,0,1))
2862
      break;
2863 2864
    if (thd->locked_tables || thd->active_transaction())
    {
2865
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
2866 2867
      goto error;
    }
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    res=mysql_rm_db(thd,lex->name,lex->drop_if_exists,0);
2869 2870
    break;
  }
2871 2872 2873 2874
  case SQLCOM_ALTER_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
2875
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
2876 2877
      break;
    }
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    if (check_access(thd,ALTER_ACL,lex->name,0,1))
2879 2880 2881
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
2882
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
2883 2884
      goto error;
    }
2885
    res=mysql_alter_db(thd,lex->name,&lex->create_info);
2886 2887
    break;
  }
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  case SQLCOM_SHOW_CREATE_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
2892
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
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      break;
    }
    if (check_access(thd,DROP_ACL,lex->name,0,1))
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
2899
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
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      goto error;
    }
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    res=mysqld_show_create_db(thd,lex->name,&lex->create_info);
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    break;
  }
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  case SQLCOM_CREATE_FUNCTION:
    if (check_access(thd,INSERT_ACL,"mysql",0,1))
      break;
#ifdef HAVE_DLOPEN
    if (!(res = mysql_create_function(thd,&lex->udf)))
2910
      send_ok(thd);
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#else
    res= -1;
#endif
    break;
  case SQLCOM_DROP_FUNCTION:
    if (check_access(thd,DELETE_ACL,"mysql",0,1))
      break;
#ifdef HAVE_DLOPEN
2919
    if (!(res = mysql_drop_function(thd,&lex->udf.name)))
2920
      send_ok(thd);
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#else
    res= -1;
#endif
    break;
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  case SQLCOM_DROP_USER:
  {
    if (check_access(thd, GRANT_ACL,"mysql",0,1))
      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:
  {
    if (check_access(thd, GRANT_ACL ,"mysql",0,1))
      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;
  }
2957 2958 2959 2960 2961 2962 2963 2964 2965
  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,
		     tables ? 0 : 1))
      goto error;

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    /*
      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
    */
2970 2971 2972 2973 2974 2975 2976 2977 2978 2979

    if (thd->user)				// If not replication
    {
      LEX_USER *user;
      List_iterator <LEX_USER> user_list(lex->users_list);
      while ((user=user_list++))
      {
	if (user->password.str &&
	    (strcmp(thd->user,user->user.str) ||
	     user->host.str &&
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	     my_strcasecmp(&my_charset_latin1,
2981
                           user->host.str, thd->host_or_ip)))
2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 2994 2995
	{
	  if (check_access(thd, UPDATE_ACL, "mysql",0,1))
	    goto error;
	  break;			// We are allowed to do changes
	}
      }
    }
    if (tables)
    {
      if (grant_option && check_grant(thd,
				      (lex->grant | lex->grant_tot_col |
				       GRANT_ACL),
				      tables))
	goto error;
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      if (!(res = mysql_table_grant(thd,tables,lex->users_list, lex->columns,
				    lex->grant,
				    lex->sql_command == SQLCOM_REVOKE)))
2999
      {
3000
	mysql_update_log.write(thd, thd->query, thd->query_length);
3001 3002
	if (mysql_bin_log.is_open())
	{
3003
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
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	  mysql_bin_log.write(&qinfo);
	}
      }
    }
    else
    {
      if (lex->columns.elements)
      {
3012
	send_error(thd,ER_ILLEGAL_GRANT_FOR_TABLE);
3013 3014 3015 3016 3017 3018 3019
	res=1;
      }
      else
	res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
			  lex->sql_command == SQLCOM_REVOKE);
      if (!res)
      {
3020
	mysql_update_log.write(thd, thd->query, thd->query_length);
3021 3022
	if (mysql_bin_log.is_open())
	{
3023
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
3024 3025
	  mysql_bin_log.write(&qinfo);
	}
3026
	if (mqh_used && lex->sql_command == SQLCOM_GRANT)
3027
	{
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	  List_iterator <LEX_USER> str_list(lex->users_list);
	  LEX_USER *user;
	  while ((user=str_list++))
3031
	    reset_mqh(thd,user);
3032
	}
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      }
    }
    break;
  }
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  case SQLCOM_RESET:
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    /* 
       RESET commands are never written to the binary log, so we have to
       initialize this variable because RESET shares the same code as FLUSH
    */
    lex->no_write_to_binlog= 1;
  case SQLCOM_FLUSH:
  {
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    if (check_global_access(thd,RELOAD_ACL) || check_db_used(thd, tables))
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      goto error;
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    /*
      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);
    }
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    break;
3072
  }
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  case SQLCOM_KILL:
    kill_one_thread(thd,lex->thread_id);
    break;
  case SQLCOM_SHOW_GRANTS:
    res=0;
3078 3079
    if ((thd->priv_user &&
	 !strcmp(thd->priv_user,lex->grant_user->user.str)) ||
3080
	!check_access(thd, SELECT_ACL, "mysql",0,1))
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    {
      res = mysql_show_grants(thd,lex->grant_user);
    }
    break;
3085
  case SQLCOM_HA_OPEN:
3086 3087
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL, tables))
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      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:
3097 3098
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL, tables))
3099
      goto error;
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    res = mysql_ha_read(thd, tables, lex->ha_read_mode, lex->backup_dir,
3101 3102
			lex->insert_list, lex->ha_rkey_mode, select_lex->where,
			select_lex->select_limit, select_lex->offset_limit);
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    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
    {
3118
      thd->options= ((thd->options & (ulong) ~(OPTION_STATUS_NO_TRANS_UPDATE)) |
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		     OPTION_BEGIN);
      thd->server_status|= SERVER_STATUS_IN_TRANS;
3121
      send_ok(thd);
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    }
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    break;
  case SQLCOM_COMMIT:
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    /*
      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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  {
3131
    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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    {
3135
      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))
3144 3145
    {
      if (thd->options & OPTION_STATUS_NO_TRANS_UPDATE)
3146
	send_warning(thd,ER_WARNING_NOT_COMPLETE_ROLLBACK,0);
3147
      else
3148
	send_ok(thd);
3149
    }
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    else
      res= -1;
3152
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
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    break;
  default:					/* Impossible */
3155
    send_ok(thd);
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    break;
  }
  thd->proc_info="query end";			// QQ
  if (res < 0)
3160
    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.

  SYNOPSYS
    single_table_command_access()
    thd - Thread handler
    privilege - asked privelage
    tables - table list of command
    res - pointer on result code variable

  RETURN
    0 - OK
    1 - access denied
*/

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static bool single_table_command_access(THD *thd, ulong privilege,
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					TABLE_LIST *tables, int *res)
					 
{
    if (check_access(thd, privilege, tables->db, &tables->grant.privilege))
      return 1;

    // Show only 1 table for check_grant
    TABLE_LIST *subselects_tables= tables->next;
    tables->next= 0;
    if (grant_option && check_grant(thd,  privilege, tables))
      return 1;

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


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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,
3228
	     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));
  ulong db_access,dummy;
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  if (save_priv)
    *save_priv=0;
  else
    save_priv= &dummy;

3239
  if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
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  {
3241
    if (!no_errors)
3242
      send_error(thd,ER_NO_DB_ERROR);	/* purecov: tested */
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    DBUG_RETURN(TRUE);				/* purecov: tested */
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  }

  if ((thd->master_access & want_access) == want_access)
  {
3248 3249 3250 3251 3252 3253 3254 3255 3256
    /*
      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))))
      db_access=acl_get(thd->host, thd->ip, (char*) &thd->remote.sin_addr,
3257
			thd->priv_user, db, test(want_access & GRANT_ACL));
3258
    *save_priv=thd->master_access | db_access;
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    DBUG_RETURN(FALSE);
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  }
3261
  if (((want_access & ~thd->master_access) & ~(DB_ACLS | EXTRA_ACL)) ||
3262
      ! db && dont_check_global_grants)
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  {						// We can never grant this
3264
    if (!no_errors)
3265
      net_printf(thd,ER_ACCESS_DENIED_ERROR,
3266
		 thd->priv_user,
3267
		 thd->priv_host,
3268
		 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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3274

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  if (db && (!thd->db || strcmp(db,thd->db)))
    db_access=acl_get(thd->host, thd->ip, (char*) &thd->remote.sin_addr,
3277
		      thd->priv_user, db, test(want_access & GRANT_ACL));
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  else
    db_access=thd->db_access;
3280 3281
  // 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);
3283 3284

  /* grant_option is set if there exists a single table or column grant */
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  if (db_access == want_access ||
3286 3287
      ((grant_option && !dont_check_global_grants) &&
       !(want_access & ~TABLE_ACLS)))
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    DBUG_RETURN(FALSE);				/* Ok */
3289
  if (!no_errors)
3290
    net_printf(thd,ER_DBACCESS_DENIED_ERROR,
3291
	       thd->priv_user,
3292
	       thd->priv_host,
3293
	       db ? db : thd->db ? thd->db : "unknown"); /* purecov: tested */
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  DBUG_RETURN(TRUE);				/* purecov: tested */
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}


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

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

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

  RETURN
    0	ok
    1	Access denied.  In this case an error is sent to the client
*/
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bool check_global_access(THD *thd, ulong want_access)
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{
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  char command[128];
3320
  if ((thd->master_access & want_access))
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    return 0;
  get_privilege_desc(command, sizeof(command), want_access);
3323
  net_printf(thd,ER_SPECIFIC_ACCESS_DENIED_ERROR,
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	     command);
  return 1;
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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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*/

3334
bool
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check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables,
3336
		   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)
  {
3343
    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
      {
3354 3355
	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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      }
    }
3361
    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
3362
			  0, no_errors))
3363
      return TRUE;
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  }
  if (grant_option)
3366
    return check_grant(thd,want_access & ~EXTRA_ACL,org_tables,
3367
		       test(want_access & EXTRA_ACL), no_errors);
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  return FALSE;
}


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static bool check_db_used(THD *thd,TABLE_LIST *tables)
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{
  for (; tables ; tables=tables->next)
  {
    if (!tables->db)
    {
      if (!(tables->db=thd->db))
      {
3380
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: tested */
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	return TRUE;				/* purecov: tested */
      }
    }
  }
  return FALSE;
}


3389 3390
static bool check_merge_table_access(THD *thd, char *db,
				     TABLE_LIST *table_list)
3391 3392 3393 3394
{
  int error=0;
  if (table_list)
  {
3395
    /* Check that all tables use the current database */
3396 3397
    TABLE_LIST *tmp;
    for (tmp=table_list; tmp ; tmp=tmp->next)
3398 3399 3400 3401
    {
      if (!tmp->db || !tmp->db[0])
	tmp->db=db;
    }
3402 3403 3404 3405 3406 3407 3408
    error=check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
			     table_list);
  }
  return error;
}


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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

3419
#ifndef EMBEDDED_LIBRARY
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bool check_stack_overrun(THD *thd,char *buf __attribute__((unused)))
{
  long stack_used;
  if ((stack_used=used_stack(thd->thread_stack,(char*) &stack_used)) >=
      (long) thread_stack_min)
  {
    sprintf(errbuff[0],ER(ER_STACK_OVERRUN),stack_used,thread_stack);
    my_message(ER_STACK_OVERRUN,errbuff[0],MYF(0));
3428
    thd->fatal_error();
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    return 1;
  }
  return 0;
}
3433
#endif /* EMBEDDED_LIBRARY */
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#define MY_YACC_INIT 1000			// Start with big alloc
#define MY_YACC_MAX  32000			// Because of 'short'

bool my_yyoverflow(short **yyss, YYSTYPE **yyvs, int *yystacksize)
{
  LEX	*lex=current_lex;
  int  old_info=0;
  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;
}


/****************************************************************************
3468
  Initialize global thd variables needed for query
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****************************************************************************/

3471
void
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mysql_init_query(THD *thd)
{
  DBUG_ENTER("mysql_init_query");
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  LEX *lex=&thd->lex;
  lex->unit.init_query();
  lex->unit.init_select();
3478
  lex->unit.thd= thd;
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  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.return_to= 
    lex->unit.link_next= 0;
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  lex->unit.prev= lex->unit.link_prev= 0;
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  lex->unit.global_parameters= lex->unit.slave= lex->current_select=
3486
    lex->all_selects_list= &lex->select_lex;
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  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;
3490
  lex->select_lex.link_prev= (st_select_lex_node**)&(lex->all_selects_list);
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  lex->describe= 0;
  lex->derived_tables= FALSE;
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  lex->lock_option= TL_READ;
  lex->found_colon= 0;
3495
  lex->safe_to_cache_query= 1;
3496
  thd->select_number= lex->select_lex.select_number= 1;
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  thd->free_list= 0;
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  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;
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  thd->is_fatal_error= thd->rand_used= 0;
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  thd->server_status &= ~SERVER_MORE_RESULTS_EXISTS;
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  thd->tmp_table_used= 0;
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  if (opt_bin_log)
    reset_dynamic(&thd->user_var_events);
3506
  thd->clear_error();
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  DBUG_VOID_RETURN;
}

3510

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void
mysql_init_select(LEX *lex)
{
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  SELECT_LEX *select_lex= lex->current_select->select_lex();
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  select_lex->init_select();
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  select_lex->master_unit()->select_limit= select_lex->select_limit=
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    lex->thd->variables.select_limit;
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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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}

3526

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bool
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mysql_new_select(LEX *lex, bool move_down)
3529
{
3530
  SELECT_LEX *select_lex = new SELECT_LEX();
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  if (!select_lex)
    return 1;
3533
  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 */
3539
    SELECT_LEX_UNIT *unit= new SELECT_LEX_UNIT();
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    if (!unit)
      return 1;
    unit->init_query();
    unit->init_select();
3544
    unit->thd= lex->thd;
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    if (lex->current_select->linkage == GLOBAL_OPTIONS_TYPE)
      unit->include_neighbour(lex->current_select);
    else
      unit->include_down(lex->current_select);
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    unit->link_next= 0;
    unit->link_prev= 0;
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    unit->return_to= lex->current_select;
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    select_lex->include_down(unit);
  }
  else
3555
    select_lex->include_neighbour(lex->current_select);
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  select_lex->master_unit()->global_parameters= select_lex;
3558
  select_lex->include_global((st_select_lex_node**)&lex->all_selects_list);
3559
  lex->current_select= select_lex;
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  return 0;
3561
}
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/*
  Create a select to return the same output as 'SELECT @@var_name'.

  SYNOPSIS
    create_select_for_variable()
    var_name		Variable name

  DESCRIPTION
    Used for SHOW COUNT(*) [ WARNINGS | ERROR]

    This will crash with a core dump if the variable doesn't exists
*/

void create_select_for_variable(const char *var_name)
{
3578
  THD *thd;
3579
  LEX *lex;
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  LEX_STRING tmp, null_lex_string;
3581
  DBUG_ENTER("create_select_for_variable");
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  thd= current_thd;
  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;
}

3595

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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->auxilliary_table_list= lex->select_lex.table_list;
3603
  lex->select_lex.table_list.empty();
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}
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3606

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void
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mysql_parse(THD *thd, char *inBuf, uint length)
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{
  DBUG_ENTER("mysql_parse");

  mysql_init_query(thd);
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  if (query_cache_send_result_to_client(thd, inBuf, length) <= 0)
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  {
    LEX *lex=lex_start(thd, (uchar*) inBuf, length);
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    if (!yyparse((void *)thd) && ! thd->is_fatal_error)
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    {
3618
      if (mqh_used && thd->user_connect &&
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	  check_mqh(thd, lex->sql_command))
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      {
	thd->net.error = 0;
      }
      else
      {
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	if (thd->net.report_error)
	  send_error(thd, 0, NullS);
	else
	{
	  mysql_execute_command(thd);
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#ifndef EMBEDDED_LIBRARY  /* TODO query cache in embedded library*/
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	  query_cache_end_of_result(&thd->net);
3632
#endif
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	}
3634
      }
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    }
    else
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    {
      DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
3639
			 thd->is_fatal_error));
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#ifndef EMBEDDED_LIBRARY   /* TODO query cache in embedded library*/
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      query_cache_abort(&thd->net);
3642
#endif
3643
    }
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    thd->proc_info="freeing items";
3645
    free_items(thd->free_list);  /* Free strings used by items */
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    lex_end(lex);
  }
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  DBUG_VOID_RETURN;
}


/*****************************************************************************
** 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,
		       Item *default_value, Item *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;
  LEX  *lex= &thd->lex;
  uint allowed_type_modifier=0;
3667
  char warn_buff[MYSQL_ERRMSG_SIZE];
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  DBUG_ENTER("add_field_to_list");

  if (strlen(field_name) > NAME_LEN)
  {
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    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));
3678
    lex->key_list.push_back(new Key(Key::PRIMARY, NullS, HA_KEY_ALG_UNDEF,
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				    lex->col_list));
    lex->col_list.empty();
  }
  if (type_modifier & (UNIQUE_FLAG | UNIQUE_KEY_FLAG))
  {
    lex->col_list.push_back(new key_part_spec(field_name,0));
3685
    lex->key_list.push_back(new Key(Key::UNIQUE, NullS, HA_KEY_ALG_UNDEF,
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				    lex->col_list));
    lex->col_list.empty();
  }

3690
  if (default_value)
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  {
3692
    if (default_value->type() == Item::NULL_ITEM)
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    {
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      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);
    }
  }
  if (!(new_field=new create_field()))
    DBUG_RETURN(1);
  new_field->field=0;
  new_field->field_name=field_name;
3712
  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;
3723
  new_field->charset=cs;
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  new_field->geom_type= (Field::geometry_type) uint_geom_type;
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3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736
  if (!comment)
  {
    new_field->comment.str=0;
    new_field->comment.length=0;
  }
  else
  {
    /* In this case comment is always of type Item_string */
    new_field->comment.str=   (char*) comment->str_value.ptr();
    new_field->comment.length=comment->str_value.length();
  }
3737 3738
  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 &&
3742
      new_field->length < new_field->decimals+1 &&
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3743
      new_field->decimals != NOT_FIXED_DEC)
3744
    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)
3771 3772 3773 3774 3775 3776 3777
      new_field->length= 10;			// Default length for DECIMAL
    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;
3779 3780 3781 3782 3783 3784 3785
  case FIELD_TYPE_STRING:
  case FIELD_TYPE_VAR_STRING:
    if (new_field->length < MAX_FIELD_WIDTH || default_value)
      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");
3787 3788 3789
    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:
3795 3796 3797 3798 3799 3800 3801 3802 3803 3804 3805 3806 3807 3808
    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())
      {
3815
	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)
      {
3835
	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
    else
    {
      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;
    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)
      {
3889
	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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      {
	new_field->length+=(uint) strip_sp((char*) *pos)+1;
      }
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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;
3907
  bool not_used3;
3908

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	thd->cuted_fields=0;
	String str,*res;
	res=default_value->val_str(&str);
3912
	(void) find_set(interval, res->ptr(), res->length(), &not_used,
3913
			&not_used2, &not_used3);
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	if (thd->cuted_fields)
	{
3916
	  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);
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	set_if_bigger(new_field->length,length);
      }
      set_if_smaller(new_field->length,MAX_FIELD_WIDTH-1);
      if (default_value)
      {
	String str,*res;
	res=default_value->val_str(&str);
	if (!find_enum(interval,res->ptr(),res->length()))
	{
3939
	  net_printf(thd,ER_INVALID_DEFAULT,field_name);
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	  DBUG_RETURN(1);
	}
      }
      break;
    }
  }

  if (new_field->length >= MAX_FIELD_WIDTH ||
      (!new_field->length && !(new_field->flags & BLOB_FLAG) &&
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       type != FIELD_TYPE_STRING && 
       type != FIELD_TYPE_VAR_STRING && type != FIELD_TYPE_GEOMETRY))
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  {
3952
    net_printf(thd,ER_TOO_BIG_FIELDLENGTH,field_name,
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	       MAX_FIELD_WIDTH-1);		/* purecov: inspected */
    DBUG_RETURN(1);				/* purecov: inspected */
  }
  type_modifier&= AUTO_INCREMENT_FLAG;
  if ((~allowed_type_modifier) & type_modifier)
  {
3959
    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;
  Item	**item_ptr;
  DBUG_ENTER("add_to_list");
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  if (!(order = (ORDER *) thd->alloc(sizeof(ORDER)+sizeof(Item*))))
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    DBUG_RETURN(1);
  item_ptr = (Item**) (order+1);
  *item_ptr=item;
  order->item= item_ptr;
  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,
					     List<String> *ignore_index)
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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);
    }
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    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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  if (use_index)
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    ptr->use_index=(List<String> *) thd->memdup((gptr) use_index,
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					       sizeof(*use_index));
  if (ignore_index)
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    ptr->ignore_index=(List<String> *) thd->memdup((gptr) ignore_index,
						   sizeof(*ignore_index));
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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 (!strcmp(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)
{
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  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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*/

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bool reload_acl_and_cache(THD *thd, ulong options, TABLE_LIST *tables,
                          bool *write_to_binlog)
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{
  bool result=0;
  select_errors=0;				/* Write if more errors */
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  bool tmp_write_to_binlog= 1;
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  if (options & REFRESH_GRANT)
  {
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    acl_reload(thd);
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    grant_reload(thd);
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    if (mqh_used)
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      reset_mqh(thd,(LEX_USER *) NULL,true);
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  }
  if (options & REFRESH_LOG)
  {
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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);
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#ifdef HAVE_REPLICATION
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    if (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);
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    }
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#endif
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    mysql_slow_log.new_file(1);
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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
      tmp_write_to_binlog= 0;
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      if (lock_global_read_lock(thd))
	return 1;
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    }
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    result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1, tables);
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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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#ifndef EMBEDDED_LIBRARY
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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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  }
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#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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#ifndef EMBEDDED_LIBRARY
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 if (options & REFRESH_SLAVE)
 {
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   tmp_write_to_binlog= 0;
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   LOCK_ACTIVE_MI;
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   if (reset_slave(thd, active_mi))
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     result=1;
   UNLOCK_ACTIVE_MI;
 }
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#endif
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 if (options & REFRESH_USER_RESOURCES)
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   reset_mqh(thd,(LEX_USER *) NULL);
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 if (write_to_binlog)
   *write_to_binlog= tmp_write_to_binlog;
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 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
*/

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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(&THR_LOCK_keycache);
  pthread_mutex_lock(&LOCK_status);
  for (struct show_var_st *ptr=status_vars; ptr->name; ptr++)
  {
    if (ptr->type == SHOW_LONG)
      *(ulong*) ptr->value=0;
  }
  pthread_mutex_unlock(&LOCK_status);
  pthread_mutex_unlock(&THR_LOCK_keycache);
}
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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, char **filename_ptr, char *table_name)
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{
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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))
  {
    my_error(ER_WRONG_TABLE_NAME, MYF(0), *filename_ptr);
    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;
}
4437

4438

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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;
4453
  if (thd->lex.current_select != &thd->lex.select_lex)
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  {
    char command[80];
    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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compare_func_creator comp_eq_creator(bool invert)
{
  return invert?&Item_bool_func2::ne_creator:&Item_bool_func2::eq_creator;
}

compare_func_creator comp_ge_creator(bool invert)
{
  return invert?&Item_bool_func2::lt_creator:&Item_bool_func2::ge_creator;
}

compare_func_creator comp_gt_creator(bool invert)
{
  return invert?&Item_bool_func2::le_creator:&Item_bool_func2::gt_creator;
}

compare_func_creator comp_le_creator(bool invert)
{
  return invert?&Item_bool_func2::gt_creator:&Item_bool_func2::le_creator;
}

compare_func_creator comp_lt_creator(bool invert)
{
  return invert?&Item_bool_func2::ge_creator:&Item_bool_func2::lt_creator;
}

compare_func_creator comp_ne_creator(bool invert)
{
  return invert?&Item_bool_func2::eq_creator:&Item_bool_func2::ne_creator;
}