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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{

492
  (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);
524
}
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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)));
554

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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];
560

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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
632
    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)
690
    thd->variables.sql_mode|= MODE_IGNORE_SPACE;
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#ifdef HAVE_OPENSSL
692
  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);
703
    }
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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)
    {
708 709
      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;
725
  using_password= test(passwd[0]);
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  if (thd->client_capabilities & CLIENT_CONNECT_WITH_DB)
727
    db=strend(passwd)+1;
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  /* We can get only old hash at this point */
730
  if (using_password && strlen(passwd) != SCRAMBLE_LENGTH)
731
    return ER_HANDSHAKE_ERROR;
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  if (thd->client_capabilities & CLIENT_INTERACTIVE)
734
    thd->variables.net_wait_timeout= thd->variables.net_interactive_timeout;
735
  if ((thd->client_capabilities & CLIENT_TRANSACTIONS) &&
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      opt_using_transactions)
    net->return_status= &thd->server_status;
738
  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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743
  /* 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];

753
    /* 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;
760
    if (user)
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      strmake(tmp_user,user,USERNAME_LENGTH);
762
    if (db)
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      strmake(tmp_db,db,NAME_LEN);

765
    /* 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;
}

796

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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
809
  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())
  {
838
    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);
892
      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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922

923
  /* The following must be called before DBUG_ENTER */
924
  if (my_thread_init() || thd->store_globals())
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925
  {
926
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
927
    thd->fatal_error();
928
    goto end;
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929
  }
930 931 932 933
  DBUG_ENTER("handle_bootstrap");

  pthread_detach_this_thread();
  thd->thread_stack= (char*) &thd;
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934
#if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__)
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935
  sigset_t set;
936 937
  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
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938 939
#endif

940
  if (thd->variables.max_join_size == HA_POS_ERROR)
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941 942 943 944
    thd->options |= OPTION_BIG_SELECTS;

  thd->proc_info=0;
  thd->version=refresh_version;
945
  thd->priv_user=thd->user=(char*) my_strdup("boot", MYF(MY_WME));
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946

947
  buff= (char*) thd->net.buff;
948
  thd->init_for_queries();
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949 950
  while (fgets(buff, thd->net.max_packet, file))
  {
951
    uint length=(uint) strlen(buff);
952
    while (length && (my_isspace(thd->charset(), buff[length-1]) ||
953
           buff[length-1] == ';'))
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954 955 956
      length--;
    buff[length]=0;
    thd->current_tablenr=0;
957
    thd->query_length=length;
958 959
    thd->query= thd->memdup_w_gap(buff, length+1, thd->db_length+1);
    thd->query[length] = '\0';
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960
    thd->query_id=query_id++;
961
    if (mqh_used && thd->user_connect && check_mqh(thd, SQLCOM_END))
962 963 964 965 966 967
    {
      thd->net.error = 0;
      close_thread_tables(thd);			// Free tables
      free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
      break;
    }
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968 969
    mysql_parse(thd,thd->query,length);
    close_thread_tables(thd);			// Free tables
970
    if (thd->is_fatal_error)
971
      break;
972
    free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
973
    free_root(&thd->transaction.mem_root,MYF(MY_KEEP_PREALLOC));
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974
  }
975 976 977 978 979 980

  /* 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);
981
  (void) pthread_cond_broadcast(&COND_thread_count);
982 983 984
  my_thread_end();
  pthread_exit(0);
  DBUG_RETURN(0);				// Never reached
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985 986
}

987 988
#endif /* EMBEDDED_LIBRARY */

989
    /* This works because items are allocated with sql_alloc() */
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990

991
void free_items(Item *item)
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992
{
993
  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))))
1005
    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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1018
  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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1024
    goto err;
1025
  if (grant_option && check_grant(thd, SELECT_ACL, table_list))
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1026 1027 1028
    goto err;

  thd->free_list = 0;
1029
  thd->query_length=(uint) strlen(tbl_name);
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1030
  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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1036
  net_flush(&thd->net);
1037
  if ((error= table->file->dump(thd,fd)))
1038
    my_error(ER_GET_ERRNO, MYF(0));
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1039

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1040 1041
err:
  close_thread_tables(thd);
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1042
  DBUG_RETURN(error);
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1043 1044 1045
}


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

#ifndef EMBEDDED_LIBRARY
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1049 1050 1051
bool do_command(THD *thd)
{
  char *packet;
1052 1053
  uint old_timeout;
  ulong packet_length;
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1054 1055 1056 1057 1058 1059 1060 1061
  NET *net;
  enum enum_server_command command;
  DBUG_ENTER("do_command");

  net= &thd->net;
  thd->current_tablenr=0;

  packet=0;
1062 1063 1064
  old_timeout=net->read_timeout;
  // Wait max for 8 hours
  net->read_timeout=(uint) thd->variables.net_wait_timeout;
1065
  thd->clear_error();				// Clear error message
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1066 1067 1068 1069

  net_new_transaction(net);
  if ((packet_length=my_net_read(net)) == packet_error)
  {
1070 1071 1072 1073 1074
    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)
1075 1076
    {
      statistic_increment(aborted_threads,&LOCK_status);
1077
      DBUG_RETURN(TRUE);			// We have to close it.
1078
    }
1079
    send_error(thd,net->last_errno,NullS);
1080
    net->error= 0;
1081
    DBUG_RETURN(FALSE);
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1082 1083 1084 1085 1086
  }
  else
  {
    packet=(char*) net->read_pos;
    command = (enum enum_server_command) (uchar) packet[0];
1087 1088
    if (command >= COM_END)
      command= COM_END;				// Wrong command
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1089 1090 1091
    DBUG_PRINT("info",("Command on %s = %d (%s)",
		       vio_description(net->vio), command,
		       command_name[command]));
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1092
  }
1093
  net->read_timeout=old_timeout;		// restore it
1094
  DBUG_RETURN(dispatch_command(command,thd, packet+1, (uint) packet_length));
1095
}
1096
#endif  /* EMBEDDED_LIBRARY */
1097

1098

1099 1100 1101 1102
bool dispatch_command(enum enum_server_command command, THD *thd,
		      char* packet, uint packet_length)
{
  NET *net= &thd->net;
1103
  bool error= 0;
1104 1105 1106 1107
  /*
    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
  */
1108 1109 1110
  bool slow_command=FALSE;
  DBUG_ENTER("dispatch_command");

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1111
  thd->command=command;
1112
  thd->set_time();
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1113 1114 1115 1116 1117 1118
  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));
1119

1120
  thd->lex.select_lex.options=0;		// We store status here
1121
  switch (command) {
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1122
  case COM_INIT_DB:
1123
    statistic_increment(com_stat[SQLCOM_CHANGE_DB],&LOCK_status);
1124
    if (!mysql_change_db(thd,packet))
1125
      mysql_log.write(thd,command,"%s",thd->db);
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1126
    break;
1127
#ifndef EMBEDDED_LIBRARY
1128 1129
  case COM_REGISTER_SLAVE:
  {
1130
    if (!register_slave(thd, (uchar*)packet, packet_length))
1131
      send_ok(thd);
1132 1133
    break;
  }
1134
#endif
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1135 1136
  case COM_TABLE_DUMP:
    {
1137
      statistic_increment(com_other, &LOCK_status);
1138
      slow_command = TRUE;
1139 1140
      uint db_len = *(uchar*)packet;
      uint tbl_len = *(uchar*)(packet + db_len + 1);
1141
      char* db = thd->alloc(db_len + tbl_len + 2);
1142
      memcpy(db, packet + 1, db_len);
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1143 1144
      char* tbl_name = db + db_len;
      *tbl_name++ = 0;
1145
      memcpy(tbl_name, packet + db_len + 2, tbl_len);
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1146
      tbl_name[tbl_len] = 0;
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1147
      if (mysql_table_dump(thd, db, tbl_name, -1))
1148
	send_error(thd); // dump to NET
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1149 1150
      break;
    }
1151
#ifndef EMBEDDED_LIBRARY
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1152 1153
  case COM_CHANGE_USER:
  {
1154
    thd->change_user();
1155
    thd->clear_error();			// If errors from rollback
1156 1157

    statistic_increment(com_other,&LOCK_status);
1158
    char *user=   (char*) packet;
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1159 1160
    char *passwd= strend(user)+1;
    char *db=     strend(passwd)+1;
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1161

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1162 1163 1164
    /* Save user and privileges */
    uint save_master_access=thd->master_access;
    uint save_db_access=    thd->db_access;
1165
    uint save_db_length=    thd->db_length;
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1166
    char *save_user=	    thd->user;
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1167
    thd->user=NULL; /* Needed for check_user to allocate new user */
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1168 1169
    char *save_priv_user=   thd->priv_user;
    char *save_db=	    thd->db;
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1170 1171 1172
    USER_CONN *save_uc=     thd->user_connect;
    bool simple_connect;
    bool using_password;
1173 1174 1175 1176 1177
    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 */
1178 1179
    int res;
    ulong pkt_len= 0;				/* Length of reply packet */
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1180

1181
    bzero((char*) prepared_scramble, sizeof(prepared_scramble));
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1182
    /* Small check for incomming packet */
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1183 1184

    if ((uint) ((uchar*) db - net->read_pos) > packet_length)
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1185
      goto restore_user_err;
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1186

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1187
    /* Now we shall basically perform authentication again */
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1188

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1189
     /* We can get only old hash at this point */
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1190
    if (passwd[0] && strlen(passwd)!=SCRAMBLE_LENGTH)
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1191
      goto restore_user_err;
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1192

1193
    cached_user= NULL;
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1194

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1195 1196
    /* Simple connect only for old clients. New clients always use sec. auth*/
    simple_connect=(!(thd->client_capabilities & CLIENT_SECURE_CONNECTION));
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1197

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1198 1199
    /* Store information if we used password. passwd will be dammaged */
    using_password=test(passwd[0]);
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1200 1201 1202 1203 1204

    if (simple_connect) /* Restore scramble for old clients */
      memcpy(thd->scramble,thd->old_scramble,9);

    /*
1205 1206
      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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1207
    */
1208 1209 1210
    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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1211
    {
1212
      /* If the client is old we just have to have auth failure */
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1213
      if (simple_connect)
1214
        goto restore_user;			/* Error is already reported */
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1215

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1216
      /* Store current used and database as they are erased with next packet */
1217
      tmp_user[0]= tmp_db[0]= 0;
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1218
      if (user)
1219
        strmake(tmp_user,user,USERNAME_LENGTH);
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1220
      if (db)
1221 1222
        strmake(tmp_db,db,NAME_LEN);

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1223
      /* Write hash and encrypted scramble to client */
1224 1225
      if (my_net_write(net,prepared_scramble,SCRAMBLE41_LENGTH+4) ||
          net_flush(net))
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1226
        goto restore_user_err;
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1227 1228 1229 1230 1231 1232

      /* Reading packet back */
      if ((pkt_len=my_net_read(net)) == packet_error)
        goto restore_user_err;

      /* We have to get very specific packet size  */
1233
      if (pkt_len != SCRAMBLE41_LENGTH)
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1234
        goto restore_user;
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1235 1236

      /* Final attempt to check the user based on reply */
1237
      if (check_user(thd,COM_CHANGE_USER, tmp_user, (char*) net->read_pos,
1238 1239
		     tmp_db, 0, 0, 1, prepared_scramble, using_password,
		     &cur_priv_version, &cached_user))
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1240
        goto restore_user;
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1241
    }
1242 1243 1244
    else if (res)
      goto restore_user;

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1245
    /* Finally we've authenticated new user */
1246
    if (max_connections && save_uc)
1247
      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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1252

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1253
    /* Bad luck  we shall restore old user */
1254
restore_user_err:
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1255
    send_error(thd, ER_UNKNOWN_COM_ERROR);
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1256

1257
restore_user:
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1258 1259 1260 1261 1262 1263
    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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1264
    thd->priv_user=save_priv_user;
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    break;
  }
1267
#endif /* EMBEDDED_LIBRARY */
1268 1269
  case COM_EXECUTE:
  {
1270
    mysql_stmt_execute(thd, packet);
1271 1272 1273 1274
    break;
  }
  case COM_LONG_DATA:
  {
1275
    mysql_stmt_get_longdata(thd, packet, packet_length);
1276 1277 1278 1279
    break;
  }
  case COM_PREPARE:
  {
1280
    mysql_stmt_prepare(thd, packet, packet_length);
1281 1282
    break;
  }
1283 1284 1285 1286 1287
  case COM_CLOSE_STMT:
  {
    mysql_stmt_free(thd, packet);
    break;
  }
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1288 1289
  case COM_QUERY:
  {
1290 1291
    if (alloc_query(thd, packet, packet_length))
      break;					// fatal error is set
1292
    mysql_log.write(thd,command,"%s",thd->query);
1293
    DBUG_PRINT("query",("%-.4096s",thd->query));
1294
    mysql_parse(thd,thd->query, thd->query_length);
1295

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1296
    while (!thd->killed && !thd->is_fatal_error && thd->lex.found_colon)
1297
    {
1298
      char *packet= thd->lex.found_colon;
1299 1300 1301 1302 1303 1304
      /* 
        Multiple queries exits, execute them individually
      */
      if (thd->lock || thd->open_tables || thd->derived_tables)
        close_thread_tables(thd);		

1305
      ulong length= thd->query_length-(ulong)(thd->lex.found_colon-thd->query);
1306 1307
      
      /* Remove garbage at start of query */
1308
      while (my_isspace(thd->charset(), *packet) && length > 0)
1309 1310 1311 1312 1313
      {
        packet++;
        length--;
      }
      thd->query_length= length;
1314 1315 1316 1317
      thd->query= packet;
      VOID(pthread_mutex_lock(&LOCK_thread_count));
      thd->query_id= query_id++;
      VOID(pthread_mutex_unlock(&LOCK_thread_count));
1318 1319 1320
      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;
  }
1326
  case COM_FIELD_LIST:				// This isn't actually needed
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#ifdef DONT_ALLOW_SHOW_COMMANDS
1328
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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1329 1330 1331
    break;
#else
  {
1332 1333
    char *fields, *pend;
    String convname;
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1334
    TABLE_LIST table_list;
1335
    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))
    {
1339
      send_error(thd,ER_NO_DB_ERROR);
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      break;
    }
    thd->free_list=0;
1343 1344 1345 1346 1347
    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;
1348
    // command not cachable => no gap for data base name
1349 1350
    if (!(thd->query=fields=thd->memdup(packet,thd->query_length+1)))
      break;
1351
    mysql_log.write(thd,command,"%s %s",table_list.real_name,fields);
1352
    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);
1362
    free_items(thd->free_list);
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    break;
  }
#endif
  case COM_QUIT:
1367
    /* We don't calculate statistics for this command */
1368
    mysql_log.write(thd,command,NullS);
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    net->error=0;				// Don't give 'abort' message
    error=TRUE;					// End server
    break;

1373
  case COM_CREATE_DB:				// QQ: To be removed
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    {
1375
      statistic_increment(com_stat[SQLCOM_CREATE_DB],&LOCK_status);
1376
      char *db=thd->strdup(packet);
1377
      // null test to handle EOM
1378
      if (!db || !strip_sp(db) || check_db_name(db))
1379
      {
1380
	net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
1381 1382
	break;
      }
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      if (check_access(thd,CREATE_ACL,db,0,1))
	break;
1385
      mysql_log.write(thd,command,packet);
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      mysql_create_db(thd,db,0,0);
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      break;
    }
1389
  case COM_DROP_DB:				// QQ: To be removed
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    {
1391
      statistic_increment(com_stat[SQLCOM_DROP_DB],&LOCK_status);
1392
      char *db=thd->strdup(packet);
1393
      // null test to handle EOM
1394
      if (!db || !strip_sp(db) || check_db_name(db))
1395
      {
1396
	net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
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	break;
      }
1399 1400
      if (check_access(thd,DROP_ACL,db,0,1))
	break;
1401 1402
      if (thd->locked_tables || thd->active_transaction())
      {
1403
	send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
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1404
	break;
1405
      }
1406
      mysql_log.write(thd,command,db);
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1407
      mysql_rm_db(thd,db,0,0);
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      break;
    }
1410
#ifndef EMBEDDED_LIBRARY
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  case COM_BINLOG_DUMP:
    {
1413
      statistic_increment(com_other,&LOCK_status);
1414
      slow_command = TRUE;
1415
      if (check_global_access(thd, REPL_SLAVE_ACL))
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1416
	break;
1417
      mysql_log.write(thd,command, 0);
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      ulong pos;
      ushort flags;
1421
      uint32 slave_server_id;
1422
      /* TODO: The following has to be changed to an 8 byte integer */
1423 1424
      pos = uint4korr(packet);
      flags = uint2korr(packet + 4);
1425
      thd->server_id=0; /* avoid suicide */
1426
      kill_zombie_dump_threads(slave_server_id = uint4korr(packet+6));
1427
      thd->server_id = slave_server_id;
1428
      mysql_binlog_send(thd, thd->strdup(packet + 10), (my_off_t) pos, flags);
1429
      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;
    }
1435
#endif
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  case COM_REFRESH:
    {
1438
      statistic_increment(com_stat[SQLCOM_FLUSH],&LOCK_status);
1439
      ulong options= (ulong) (uchar) packet[0];
1440
      if (check_global_access(thd,RELOAD_ACL))
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1441
	break;
1442
      mysql_log.write(thd,command,NullS);
1443 1444 1445 1446
      if (reload_acl_and_cache(thd, options, (TABLE_LIST*) 0, NULL))
        send_error(thd, 0);
      else
        send_ok(thd);
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      break;
    }
1449
#ifndef EMBEDDED_LIBRARY
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1450
  case COM_SHUTDOWN:
1451
    statistic_increment(com_other,&LOCK_status);
1452
    if (check_global_access(thd,SHUTDOWN_ACL))
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      break; /* purecov: inspected */
    DBUG_PRINT("quit",("Got shutdown command"));
1455
    mysql_log.write(thd,command,NullS);
1456
    send_eof(thd);
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#ifdef __WIN__
    sleep(1);					// must wait after eof()
#endif
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#ifndef OS2
1461
    send_eof(thd);				// This is for 'quit request'
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#endif
1463
    close_connection(thd, 0, 1);
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    close_thread_tables(thd);			// Free before kill
1465
    free_root(&thd->mem_root,MYF(0));
1466
    free_root(&thd->transaction.mem_root,MYF(0));
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    kill_mysql();
    error=TRUE;
    break;
1470 1471
#endif
#ifndef EMBEDDED_LIBRARY
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  case COM_STATISTICS:
  {
1474
    mysql_log.write(thd,command,NullS);
1475
    statistic_increment(com_stat[SQLCOM_SHOW_STATUS],&LOCK_status);
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    char buff[200];
1477
    ulong uptime = (ulong) (thd->start_time - start_time);
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1478
    sprintf((char*) buff,
1479
	    "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
1489
    VOID(my_net_write(net, buff,(uint) strlen(buff)));
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    VOID(net_flush(net));
    break;
  }
1493
#endif
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  case COM_PING:
1495
    statistic_increment(com_other,&LOCK_status);
1496
    send_ok(thd);				// Tell client we are alive
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    break;
  case COM_PROCESS_INFO:
1499
    statistic_increment(com_stat[SQLCOM_SHOW_PROCESSLIST],&LOCK_status);
1500
    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
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      break;
1502
    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:
  {
1508
    statistic_increment(com_stat[SQLCOM_KILL],&LOCK_status);
1509
    ulong id=(ulong) uint4korr(packet);
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    kill_one_thread(thd,id);
    break;
  }
  case COM_DEBUG:
1514
    statistic_increment(com_other,&LOCK_status);
1515
    if (check_global_access(thd, SUPER_ACL))
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      break;					/* purecov: inspected */
    mysql_print_status(thd);
1518
    mysql_log.write(thd,command,NullS);
1519
    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:
1525
  case COM_END:
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1526
  default:
1527
    send_error(thd, ER_UNKNOWN_COM_ERROR);
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    break;
  }
1530
  if (thd->lock || thd->open_tables || thd->derived_tables)
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  {
    thd->proc_info="closing tables";
    close_thread_tables(thd);			/* Free tables */
  }

1536
  if (thd->is_fatal_error)
1537
    send_error(thd,0);				// End of memory ?
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1538 1539

  time_t start_of_query=thd->start_time;
1540
  thd->end_time();				// Set start time
1541

1542
  /* If not reading from backup and if the query took too long */
1543
  if (!slow_command && !thd->user_time) // do not log 'slow_command' queries
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1544
  {
1545 1546
    thd->proc_info="logging slow query";

1547 1548
    if ((ulong) (thd->start_time - thd->time_after_lock) >
	thd->variables.long_query_time ||
1549
	((thd->lex.select_lex.options &
1550
	  (QUERY_NO_INDEX_USED | QUERY_NO_GOOD_INDEX_USED)) &&
1551
	 (specialflag & SPECIAL_LONG_LOG_FORMAT)))
1552 1553 1554 1555
    {
      long_query_count++;
      mysql_slow_log.write(thd, thd->query, thd->query_length, start_of_query);
    }
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1556
  }
1557
  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));
1564
  thd->packet.shrink(thd->variables.net_buffer_length);	// Reclaim some memory
1565
  free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
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  DBUG_RETURN(error);
}

1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586

/*
  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
1587
  /* Remove garbage at start and end of query */
1588
  while (my_isspace(thd->charset(),packet[0]) && packet_length > 0)
1589 1590 1591 1592 1593
  {
    packet++;
    packet_length--;
  }
  char *pos=packet+packet_length;		// Point at end null
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  while (packet_length > 0 &&
1595
	 (pos[-1] == ';' || my_isspace(thd->charset() ,pos[-1])))
1596 1597 1598 1599 1600 1601 1602
  {
    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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1603 1604
					      thd->db_length+2+
					      sizeof(ha_rows))))
1605 1606 1607 1608 1609 1610 1611 1612 1613 1614
    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
1621
mysql_execute_command(THD *thd)
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1622
{
1623
  int	res= 0;
1624
  LEX	*lex= &thd->lex;
1625
  TABLE_LIST *tables= (TABLE_LIST*) lex->select_lex.table_list.first;
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  SELECT_LEX *select_lex= &lex->select_lex;
1627
  SELECT_LEX_UNIT *unit= &lex->unit;
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  DBUG_ENTER("mysql_execute_command");

1630 1631 1632 1633 1634 1635
  /*
    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.
  */
1636
  if (tables || &lex->select_lex != lex->all_selects_list)
1637 1638 1639 1640 1641 1642 1643
    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;

1644
#ifndef EMBEDDED_LIBRARY
1645 1646
  if (thd->slave_thread)
  {
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1647
    /*
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merge  
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1648 1649 1650 1651
      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))
1652
      DBUG_VOID_RETURN;
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merge  
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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()
    */
1659 1660 1661
    if (lex->sql_command == SQLCOM_SELECT)
    {
      lex->sql_command = SQLCOM_DO;
1662
      lex->insert_list = &select_lex->item_list;
1663
    }
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merge  
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1664
#endif
1665
  }
1666
#endif /* EMBEDDED_LIBRARY */
1667
  /*
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1668 1669
    TODO: make derived tables processing 'inside' SELECT processing.
    TODO: solve problem with depended derived tables in subselects
1670
  */
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1671
  if (lex->derived_tables)
1672
  {
1673 1674 1675
    for (SELECT_LEX *sl= lex->all_selects_list;
	 sl;
	 sl= sl->next_select_in_list())
1676
    {
1677 1678 1679
      for (TABLE_LIST *cursor= sl->get_table_list();
	   cursor;
	   cursor= cursor->next)
1680
      {
1681 1682 1683
	if (cursor->derived && (res=mysql_derived(thd, lex,
						  cursor->derived,
						  cursor)))
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1684
	{
1685 1686 1687 1688
	  if (res < 0 || thd->net.report_error)
	    send_error(thd,thd->killed ? ER_SERVER_SHUTDOWN : 0);
	  DBUG_VOID_RETURN;
	}
1689 1690
      }
    }
1691
  }
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1692
  if ((&lex->select_lex != lex->all_selects_list &&
1693
       lex->unit.create_total_list(thd, lex, &tables, 0)) 
1694
#ifdef HAVE_REPLICATION
1695
      ||
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1696
      (table_rules_on && tables && thd->slave_thread &&
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       !tables_ok(thd,tables))
#endif
      )
1700
    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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1710
    send_error(thd, ER_CANT_UPDATE_WITH_READLOCK);
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    DBUG_VOID_RETURN;
  }
1713

1714
  statistic_increment(com_stat[lex->sql_command],&LOCK_status);
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  switch (lex->sql_command) {
  case SQLCOM_SELECT:
  {
1718
    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
    }

1735 1736 1737
    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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1738
    if (unit->select_limit_cnt <
1739
	(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)
1742
      select_lex->options&= ~OPTION_FOUND_ROWS;
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    if (!(res=open_and_lock_tables(thd,tables)))
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1745
    {
1746
      if (lex->describe)
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1747
      {
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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);
1755
	fix_tables_pointers(lex->all_selects_list);
1756
	res= mysql_explain_union(thd, &thd->lex.unit, result);
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	MYSQL_LOCK *save_lock= thd->lock;
	thd->lock= (MYSQL_LOCK *)0;
1759
	result->send_eof();
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	thd->lock= save_lock;
      }
      else
      {
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	if (!result)
	{
1766
	  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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1782
  case SQLCOM_DO:
1783 1784 1785 1786 1787 1788 1789 1790
    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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1791 1792
    break;

1793
  case SQLCOM_EMPTY_QUERY:
1794
    send_ok(thd);
1795 1796
    break;

1797 1798 1799 1800
  case SQLCOM_HELP:
    res= mysqld_help(thd,lex->help_arg);
    break;

1801
#ifndef EMBEDDED_LIBRARY
1802
  case SQLCOM_PURGE:
1803
  {
1804
    if (check_global_access(thd, SUPER_ACL))
1805
      goto error;
1806
    // PURGE MASTER LOGS TO 'file'
1807 1808 1809
    res = purge_master_logs(thd, lex->to_log);
    break;
  }
1810 1811 1812 1813 1814 1815 1816 1817
  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;
  }
1818 1819
#endif

1820 1821
  case SQLCOM_SHOW_WARNS:
  {
1822 1823
    res= mysqld_show_warnings(thd, (ulong)
			      ((1L << (uint) MYSQL_ERROR::WARN_LEVEL_NOTE) |
1824 1825 1826
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_WARN) |
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR)
			       ));
1827 1828 1829 1830
    break;
  }
  case SQLCOM_SHOW_ERRORS:
  {
1831 1832
    res= mysqld_show_warnings(thd, (ulong)
			      (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR));
1833 1834
    break;
  }
1835 1836
  case SQLCOM_SHOW_NEW_MASTER:
  {
1837
    if (check_global_access(thd, REPL_SLAVE_ACL))
1838
      goto error;
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1839
#ifndef WORKING_NEW_MASTER
1840
    net_printf(thd, ER_NOT_SUPPORTED_YET, "SHOW NEW MASTER");
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1841 1842
    res= 1;
#else
1843
    res = show_new_master(thd);
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1844
#endif
1845 1846
    break;
  }
1847 1848

#ifndef EMBEDDED_LIBRARY
1849 1850
  case SQLCOM_SHOW_SLAVE_HOSTS:
  {
1851
    if (check_global_access(thd, REPL_SLAVE_ACL))
1852 1853 1854 1855
      goto error;
    res = show_slave_hosts(thd);
    break;
  }
1856 1857
  case SQLCOM_SHOW_BINLOG_EVENTS:
  {
1858
    if (check_global_access(thd, REPL_SLAVE_ACL))
1859 1860 1861 1862
      goto error;
    res = show_binlog_events(thd);
    break;
  }
1863 1864
#endif

1865
  case SQLCOM_BACKUP_TABLE:
1866 1867 1868
  {
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL, tables) ||
1869
	check_global_access(thd, FILE_ACL))
1870 1871
      goto error; /* purecov: inspected */
    res = mysql_backup_table(thd, tables);
1872

1873 1874
    break;
  }
1875
  case SQLCOM_RESTORE_TABLE:
1876 1877
  {
    if (check_db_used(thd,tables) ||
1878 1879
	check_table_access(thd, INSERT_ACL, tables) ||
	check_global_access(thd, FILE_ACL))
1880 1881 1882 1883
      goto error; /* purecov: inspected */
    res = mysql_restore_table(thd, tables);
    break;
  }
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1884 1885 1886 1887 1888 1889 1890 1891 1892
  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;
  }
      
1893 1894

#ifndef EMBEDDED_LIBRARY
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1895
  case SQLCOM_CHANGE_MASTER:
1896
  {
1897
    if (check_global_access(thd, SUPER_ACL))
1898
      goto error;
1899 1900 1901
    LOCK_ACTIVE_MI;
    res = change_master(thd,active_mi);
    UNLOCK_ACTIVE_MI;
1902 1903
    break;
  }
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1904
  case SQLCOM_SHOW_SLAVE_STAT:
1905
  {
1906 1907
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
1908
      goto error;
1909 1910 1911
    LOCK_ACTIVE_MI;
    res = show_master_info(thd,active_mi);
    UNLOCK_ACTIVE_MI;
1912 1913
    break;
  }
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1914
  case SQLCOM_SHOW_MASTER_STAT:
1915
  {
1916 1917
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
1918 1919 1920 1921
      goto error;
    res = show_binlog_info(thd);
    break;
  }
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1922

1923
  case SQLCOM_LOAD_MASTER_DATA: // sync with master
1924
    if (check_global_access(thd, SUPER_ACL))
1925
      goto error;
1926 1927 1928 1929
    if (end_active_trans(thd))
      res= -1;
    else
      res = load_master_data(thd);
1930
    break;
1931
#endif /* EMBEDDED_LIBRARY */
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1932

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1933 1934 1935
#ifdef HAVE_INNOBASE_DB
  case SQLCOM_SHOW_INNODB_STATUS:
    {
1936
      if (check_global_access(thd, SUPER_ACL))
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1937 1938 1939 1940 1941
	goto error;
      res = innodb_show_status(thd);
      break;
    }
#endif
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1942

1943
#ifndef EMBEDDED_LIBRARY
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1944
  case SQLCOM_LOAD_MASTER_TABLE:
1945
  {
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1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957
    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)
1958
	goto error;
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1959
    }
1960
    if (strlen(tables->real_name) > NAME_LEN)
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1961
    {
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1962
      net_printf(thd,ER_WRONG_TABLE_NAME,tables->real_name);
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1963 1964
      break;
    }
1965 1966 1967 1968 1969
    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))
    {
1970
      send_ok(thd);
1971 1972
    }
    UNLOCK_ACTIVE_MI;
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1973
    break;
1974
  }
1975 1976
#endif /* EMBEDDED_LIBRARY */

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1977
  case SQLCOM_CREATE_TABLE:
1978 1979 1980
  {
    ulong want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
		      CREATE_TMP_ACL : CREATE_ACL);
1981 1982
    if (!tables->db)
      tables->db=thd->db;
1983
    if (check_access(thd,want_priv,tables->db,&tables->grant.privilege) ||
1984 1985 1986
	check_merge_table_access(thd, tables->db,
				 (TABLE_LIST *)
				 lex->create_info.merge_list.first))
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1987
      goto error;				/* purecov: inspected */
1988
    if (grant_option && want_priv != CREATE_TMP_ACL)
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1989 1990 1991 1992
    {
      /* Check that the first table has CREATE privilege */
      TABLE_LIST *tmp_table_list=tables->next;
      tables->next=0;
1993
      bool error=check_grant(thd, want_priv, tables);
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1994 1995 1996 1997
      tables->next=tmp_table_list;
      if (error)
	goto error;
    }
1998
    if (strlen(tables->real_name) > NAME_LEN)
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1999
    {
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2000
      net_printf(thd, ER_WRONG_TABLE_NAME, tables->alias);
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2001 2002 2003
      res=0;
      break;
    }
2004 2005 2006
#ifndef HAVE_READLINK
    lex->create_info.data_file_name=lex->create_info.index_file_name=0;
#else
2007
    /* Fix names if symlinked tables */
2008
    if (append_file_to_dir(thd, &lex->create_info.data_file_name,
2009
			   tables->real_name) ||
2010
	append_file_to_dir(thd,&lex->create_info.index_file_name,
2011
			   tables->real_name))
2012 2013 2014 2015
    {
      res=-1;
      break;
    }
2016
#endif
2017
    if (select_lex->item_list.elements)		// With select
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2018 2019 2020 2021
    {
      select_result *result;

      if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
2022
	  find_real_table_in_list(tables->next, tables->db, tables->real_name))
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2023
      {
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2024
	net_printf(thd,ER_UPDATE_TABLE_USED,tables->real_name);
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2025 2026 2027 2028 2029 2030 2031
	DBUG_VOID_RETURN;
      }
      if (tables->next)
      {
	if (check_table_access(thd, SELECT_ACL, tables->next))
	  goto error;				// Error message is given
      }
2032
      select_lex->options|= SELECT_NO_UNLOCK;
2033 2034 2035 2036 2037
      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
2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053

      /* 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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2054 2055
    else // regular create
    {
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2056 2057 2058 2059 2060 2061 2062 2063
      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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2064
      if (!res)
2065
	send_ok(thd);
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2066 2067
    }
    break;
2068
  }
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2069 2070 2071 2072 2073 2074 2075
  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;
2076 2077 2078 2079
    if (end_active_trans(thd))
      res= -1;
    else
      res = mysql_create_index(thd, tables, lex->key_list);
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2080 2081
    break;

2082
#ifndef EMBEDDED_LIBRARY
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2083
  case SQLCOM_SLAVE_START:
2084 2085 2086 2087
  {
    LOCK_ACTIVE_MI;
    start_slave(thd,active_mi,1 /* net report*/);
    UNLOCK_ACTIVE_MI;
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2088
    break;
2089
  }
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2090
  case SQLCOM_SLAVE_STOP:
2091 2092 2093 2094 2095 2096
  /*
    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,
2097
      so it waits for the client thread because t is locked by it.
2098
    - then the client thread does SLAVE STOP.
2099 2100
      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.
2101 2102 2103 2104 2105
    To prevent that, refuse SLAVE STOP if the
    client thread has locked tables
  */
  if (thd->locked_tables || thd->active_transaction())
  {
2106
    send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
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2107
    break;
2108
  }
2109 2110 2111 2112
  {
    LOCK_ACTIVE_MI;
    stop_slave(thd,active_mi,1/* net report*/);
    UNLOCK_ACTIVE_MI;
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2113
    break;
2114
  }
2115 2116
#endif

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2117 2118
  case SQLCOM_ALTER_TABLE:
#if defined(DONT_ALLOW_SHOW_COMMANDS)
2119
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
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2120 2121 2122
    break;
#else
    {
2123
      ulong priv=0;
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2124
      if (lex->name && (!lex->name[0] || strlen(lex->name) > NAME_LEN))
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2125
      {
2126
	net_printf(thd,ER_WRONG_TABLE_NAME,lex->name);
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2127 2128 2129
	res=0;
	break;
      }
2130 2131
      if (!tables->db)
	tables->db=thd->db;
2132 2133
      if (!select_lex->db)
	select_lex->db=tables->db;
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2134
      if (check_access(thd,ALTER_ACL,tables->db,&tables->grant.privilege) ||
2135
	  check_access(thd,INSERT_ACL | CREATE_ACL,select_lex->db,&priv) ||
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2136
	  check_merge_table_access(thd, tables->db,
2137 2138 2139
				   (TABLE_LIST *)
				   lex->create_info.merge_list.first))
	goto error;				/* purecov: inspected */
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2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150
      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;
2151
	  tmp_table.db=select_lex->db;
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2152 2153 2154 2155 2156
	  tmp_table.grant.privilege=priv;
	  if (check_grant(thd,INSERT_ACL | CREATE_ACL,tables))
	    goto error;
	}
      }
2157 2158
      /* 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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2159
      /* ALTER TABLE ends previous transaction */
2160
      if (end_active_trans(thd))
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2161 2162
	res= -1;
      else
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2163
      {
2164
	res= mysql_alter_table(thd, select_lex->db, lex->name,
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2165 2166 2167
			       &lex->create_info,
			       tables, lex->create_list,
			       lex->key_list, lex->drop_list, lex->alter_list,
2168
			       select_lex->order_list.elements,
2169
                               (ORDER *) select_lex->order_list.first,
2170 2171
			       lex->drop_primary, lex->duplicates,
			       lex->alter_keys_onoff, lex->simple_alter);
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2172
      }
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2173 2174 2175
      break;
    }
#endif
2176
  case SQLCOM_RENAME_TABLE:
2177 2178 2179
  {
    TABLE_LIST *table;
    if (check_db_used(thd,tables))
2180
      goto error;
2181 2182
    for (table=tables ; table ; table=table->next->next)
    {
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2183 2184
      if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
		       &table->grant.privilege) ||
2185 2186 2187 2188 2189
	  check_access(thd, INSERT_ACL | CREATE_ACL, table->next->db,
		       &table->next->grant.privilege))
	goto error;
      if (grant_option)
      {
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2190 2191 2192 2193 2194
	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) ||
2195
	    (!test_all_bits(table->next->grant.privilege,
2196
			    INSERT_ACL | CREATE_ACL) &&
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2197
	     check_grant(thd,INSERT_ACL | CREATE_ACL, &new_list)))
2198 2199 2200
	  goto error;
      }
    }
2201
    query_cache_invalidate3(thd, tables, 0);
2202 2203 2204
    if (end_active_trans(thd))
      res= -1;
    else if (mysql_rename_tables(thd,tables))
2205 2206
      res= -1;
    break;
2207
  }
2208
#ifndef EMBEDDED_LIBRARY
2209 2210
  case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2211
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
2212 2213 2214
    DBUG_VOID_RETURN;
#else
    {
2215
      if (check_global_access(thd, SUPER_ACL))
2216 2217 2218 2219
	goto error;
      res = show_binlogs(thd);
      break;
    }
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2220
#endif
2221
#endif /* EMBEDDED_LIBRARY */
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2222
  case SQLCOM_SHOW_CREATE:
2223
#ifdef DONT_ALLOW_SHOW_COMMANDS
2224
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
2225 2226
    DBUG_VOID_RETURN;
#else
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2227
    {
2228 2229 2230 2231
      if (check_db_used(thd, tables) ||
	  check_access(thd, SELECT_ACL | EXTRA_ACL, tables->db,
		       &tables->grant.privilege))
	goto error;
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2232
      res = mysqld_show_create(thd, tables);
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2233 2234
      break;
    }
2235
#endif
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2236
  case SQLCOM_REPAIR:
2237 2238 2239 2240 2241
  {
    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);
2242 2243 2244 2245 2246 2247 2248 2249 2250 2251
    /* ! 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);
      }
    }
2252 2253
    break;
  }
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2254
  case SQLCOM_CHECK:
2255 2256 2257 2258 2259 2260 2261
  {
    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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2262 2263
  case SQLCOM_ANALYZE:
  {
2264 2265
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables))
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2266
      goto error; /* purecov: inspected */
2267
    res = mysql_analyze_table(thd, tables, &lex->check_opt);
2268 2269 2270 2271 2272 2273 2274 2275 2276 2277
    /* ! 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);
      }
    }
2278
    break;
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2279
  }
2280

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2281 2282 2283
  case SQLCOM_OPTIMIZE:
  {
    HA_CREATE_INFO create_info;
2284 2285
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables))
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2286
      goto error; /* purecov: inspected */
2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297
    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;
2298
      create_info.table_charset=default_charset_info;
2299 2300 2301
      res= mysql_alter_table(thd, NullS, NullS, &create_info,
			     tables, lex->create_list,
			     lex->key_list, lex->drop_list, lex->alter_list,
2302 2303
                             0, (ORDER *) 0,
			     0, DUP_ERROR);
2304 2305 2306
    }
    else
      res = mysql_optimize_table(thd, tables, &lex->check_opt);
2307 2308 2309 2310 2311 2312 2313 2314 2315 2316
    /* ! 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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2317 2318 2319
    break;
  }
  case SQLCOM_UPDATE:
2320
    if (check_db_used(thd,tables))
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2321
      goto error;
2322

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2323
    if (single_table_command_access(thd, UPDATE_ACL, tables, &res))
2324
	goto error;
2325

2326
    if (select_lex->item_list.elements != lex->value_list.elements)
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2327
    {
2328
      send_error(thd,ER_WRONG_VALUE_COUNT);
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2329 2330
      DBUG_VOID_RETURN;
    }
2331 2332 2333 2334
    res= mysql_update(thd,tables,
                      select_lex->item_list,
                      lex->value_list,
                      select_lex->where,
2335
		      select_lex->order_list.elements,
2336 2337 2338
                      (ORDER *) select_lex->order_list.first,
                      select_lex->select_limit,
                      lex->duplicates);
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2339 2340
    if (thd->net.report_error)
      res= -1;
2341 2342 2343 2344 2345 2346 2347
    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)
2348
    {
2349 2350
      send_error(thd,ER_WRONG_VALUE_COUNT);
      DBUG_VOID_RETURN;
2351 2352
    }
    {
2353
      const char *msg= 0;
2354
      if (select_lex->order_list.elements)
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2355
	msg= "ORDER BY";
2356 2357
      else if (select_lex->select_limit && select_lex->select_limit !=
	       HA_POS_ERROR)
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2358
	msg= "LIMIT";
2359
      if (msg)
2360
      {
2361
	net_printf(thd, ER_WRONG_USAGE, "UPDATE", msg);
2362 2363
	res= 1;
	break;
2364
      }
2365 2366 2367 2368 2369
      res= mysql_multi_update(thd,tables,
			      &select_lex->item_list,
			      &lex->value_list,
			      select_lex->where,
			      select_lex->options,
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2370
			      lex->duplicates, unit, select_lex);
2371
    }
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2372 2373
    break;
  case SQLCOM_REPLACE:
2374 2375
  case SQLCOM_INSERT:
  {
2376
    my_bool update=(lex->value_list.elements ? UPDATE_ACL : 0);
2377
    ulong privilege= (lex->duplicates == DUP_REPLACE ?
2378
                      INSERT_ACL | DELETE_ACL : INSERT_ACL | update);
2379

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2380
    if (single_table_command_access(thd, privilege, tables, &res))
2381 2382
	goto error;

2383 2384 2385 2386 2387
    if (select_lex->item_list.elements != lex->value_list.elements)
    {
      send_error(thd,ER_WRONG_VALUE_COUNT);
      DBUG_VOID_RETURN;
    }
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2388
    res = mysql_insert(thd,tables,lex->field_list,lex->many_values,
2389
                       select_lex->item_list, lex->value_list,
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2390
                       (update ? DUP_UPDATE : lex->duplicates));
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2391 2392
    if (thd->net.report_error)
      res= -1;
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2393
    break;
2394
  }
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2395 2396 2397
  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
  {
2398

2399 2400 2401 2402
    /*
      Check that we have modify privileges for the first table and
      select privileges for the rest
    */
2403
    {
2404 2405
      ulong privilege= (lex->duplicates == DUP_REPLACE ?
                        INSERT_ACL | DELETE_ACL : INSERT_ACL);
2406 2407 2408 2409 2410 2411 2412 2413 2414 2415
      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;
    }
2416 2417
    /* Don't unlock tables until command is written to binary log */
    select_lex->options|= SELECT_NO_UNLOCK;
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2418 2419

    select_result *result;
2420 2421 2422 2423
    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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2424

2425
    if (find_real_table_in_list(tables->next, tables->db, tables->real_name))
2426
    {
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2427
      net_printf(thd,ER_UPDATE_TABLE_USED,tables->real_name);
2428
      DBUG_VOID_RETURN;
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2429
    }
2430 2431 2432 2433 2434 2435 2436

    /* 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,
2437
				    lex->duplicates)))
2438
	res=handle_select(thd,lex,result);
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2439 2440
      if (thd->net.report_error)
	res= -1;
2441 2442 2443
    }
    else
      res= -1;
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2444 2445
    break;
  }
2446
  case SQLCOM_TRUNCATE:
2447 2448
    if (check_access(thd,DELETE_ACL,tables->db,&tables->grant.privilege))
      goto error; /* purecov: inspected */
2449 2450
    if (grant_option && check_grant(thd,DELETE_ACL,tables))
      goto error;
2451 2452 2453 2454 2455 2456
    /*
      Don't allow this within a transaction because we want to use
      re-generate table
    */
    if (thd->locked_tables || thd->active_transaction())
    {
2457
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION,NullS);
2458 2459 2460 2461
      goto error;
    }
    res=mysql_truncate(thd,tables);
    break;
2462
  case SQLCOM_DELETE:
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2463
  {
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2464 2465
    if (single_table_command_access(thd, DELETE_ACL, tables, &res))
      goto error;
2466

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2467 2468
    // Set privilege for the WHERE clause
    tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
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2469 2470
    res = mysql_delete(thd,tables, select_lex->where,
                       (ORDER*) select_lex->order_list.first,
2471
                       select_lex->select_limit, select_lex->options);
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2472 2473
    if (thd->net.report_error)
      res= -1;
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2474 2475
    break;
  }
2476
  case SQLCOM_DELETE_MULTI:
2477 2478 2479 2480 2481
  {
    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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2482

2483 2484
    /* sql_yacc guarantees that tables and aux_tables are not zero */
    if (check_db_used(thd, tables) || check_db_used(thd,aux_tables) ||
2485
	check_table_access(thd,SELECT_ACL, tables) ||
2486 2487 2488
	check_table_access(thd,DELETE_ACL, aux_tables))
      goto error;
    if ((thd->options & OPTION_SAFE_UPDATES) && !select_lex->where)
2489
    {
2490
      send_error(thd,ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE);
2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505
      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)
      {
2506
	net_printf(thd,ER_NONUNIQ_TABLE,auxi->real_name);
2507 2508
	goto error;
      }
2509
      walk->lock_type= auxi->lock_type;
2510
      auxi->table_list=  walk;		// Remember corresponding table
2511
    }
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2512
    if (add_item_to_list(thd, new Item_null()))
2513
    {
2514
      res= -1;
2515
      break;
2516 2517 2518 2519 2520 2521
    }
    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)
2522
      auxi->table= auxi->table_list->table;
2523
    if (&lex->select_lex != lex->all_selects_list)
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2524
    {
2525 2526 2527 2528 2529
      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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2530
	  my_error(ER_UPDATE_TABLE_USED, MYF(0), t->real_name);
2531 2532 2533 2534
	  res= -1;
	  break;
	}
      }
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2535
    }
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2536
    fix_tables_pointers(lex->all_selects_list);
2537 2538
    if (!thd->is_fatal_error && (result= new multi_delete(thd,aux_tables,
							  table_count)))
2539
    {
2540 2541 2542
      res= mysql_select(thd, &select_lex->ref_pointer_array,
			select_lex->get_table_list(),
			select_lex->with_wild,
2543
			select_lex->item_list,
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2544
			select_lex->where,
2545
			0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
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2546 2547
			(ORDER *)NULL,
			select_lex->options | thd->options |
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2548
			SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK,
2549
			result, unit, select_lex, 0);
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2550 2551
      if (thd->net.report_error)
	res= -1;
2552
      delete result;
2553 2554 2555 2556 2557 2558
    }
    else
      res= -1;					// Error is not sent
    close_thread_tables(thd);
    break;
  }
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2559
  case SQLCOM_DROP_TABLE:
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2560
  {
2561 2562 2563 2564 2565 2566 2567 2568 2569 2570
    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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monty@tik.mysql.fi committed
2571
    else
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2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583
    {
      /*
	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;
    }
2584
    res= mysql_rm_table(thd,tables,lex->drop_if_exists, lex->drop_temporary);
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2585 2586
  }
  break;
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2587 2588 2589 2590 2591 2592 2593
  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;
2594 2595 2596 2597
    if (end_active_trans(thd))
      res= -1;
    else
      res = mysql_drop_index(thd, tables, lex->drop_list);
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2598 2599
    break;
  case SQLCOM_SHOW_DATABASES:
2600
#if defined(DONT_ALLOW_SHOW_COMMANDS)
2601
    send_error(thd,ER_NOT_ALLOWED_COMMAND);   /* purecov: inspected */
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2602 2603 2604
    DBUG_VOID_RETURN;
#else
    if ((specialflag & SPECIAL_SKIP_SHOW_DB) &&
2605
	check_global_access(thd, SHOW_DB_ACL))
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2606 2607 2608 2609 2610
      goto error;
    res= mysqld_show_dbs(thd, (lex->wild ? lex->wild->ptr() : NullS));
    break;
#endif
  case SQLCOM_SHOW_PROCESSLIST:
2611
    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
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2612 2613 2614 2615
      break;
    mysqld_list_processes(thd,thd->master_access & PROCESS_ACL ? NullS :
			  thd->priv_user,lex->verbose);
    break;
2616 2617 2618 2619 2620 2621 2622 2623 2624
  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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2625
  case SQLCOM_SHOW_STATUS:
2626
    res= mysqld_show(thd,(lex->wild ? lex->wild->ptr() : NullS),status_vars,
2627
		     OPT_GLOBAL);
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2628 2629 2630
    break;
  case SQLCOM_SHOW_VARIABLES:
    res= mysqld_show(thd, (lex->wild ? lex->wild->ptr() : NullS),
2631
		     init_vars, lex->option_type);
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2632
    break;
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2633 2634
  case SQLCOM_SHOW_LOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2635
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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2636 2637 2638 2639 2640 2641 2642 2643 2644
    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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2645
  case SQLCOM_SHOW_TABLES:
2646
    /* FALL THROUGH */
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bk@work.mysql.com committed
2647
#ifdef DONT_ALLOW_SHOW_COMMANDS
2648
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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2649 2650 2651
    DBUG_VOID_RETURN;
#else
    {
2652
      char *db=select_lex->db ? select_lex->db : thd->db;
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2653 2654
      if (!db)
      {
2655
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
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2656 2657 2658
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);				// Fix escaped '_'
2659
      if (check_db_name(db))
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bk@work.mysql.com committed
2660
      {
2661
        net_printf(thd,ER_WRONG_DB_NAME, db);
2662
        goto error;
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2663 2664 2665 2666
      }
      if (check_access(thd,SELECT_ACL,db,&thd->col_access))
	goto error;				/* purecov: inspected */
      /* grant is checked in mysqld_show_tables */
2667
      if (select_lex->options & SELECT_DESCRIBE)
2668
        res= mysqld_extend_show_tables(thd,db,
2669
				       (lex->wild ? lex->wild->ptr() : NullS));
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2670 2671 2672 2673 2674 2675
      else
	res= mysqld_show_tables(thd,db,
				(lex->wild ? lex->wild->ptr() : NullS));
      break;
    }
#endif
2676 2677 2678
  case SQLCOM_SHOW_OPEN_TABLES:
    res= mysqld_show_open_tables(thd,(lex->wild ? lex->wild->ptr() : NullS));
    break;
2679 2680
  case SQLCOM_SHOW_CHARSETS:
    res= mysqld_show_charsets(thd,(lex->wild ? lex->wild->ptr() : NullS));
2681
    break;
2682 2683 2684
  case SQLCOM_SHOW_COLLATIONS:
    res= mysqld_show_collations(thd,(lex->wild ? lex->wild->ptr() : NullS));
    break;
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2685 2686
  case SQLCOM_SHOW_FIELDS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2687
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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2688 2689 2690
    DBUG_VOID_RETURN;
#else
    {
2691 2692
      char *db=tables->db;
      if (!*db)
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2693
      {
2694
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
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2695 2696 2697
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);			// Fix escaped '_'
2698
      remove_escape(tables->real_name);
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2699 2700 2701 2702 2703 2704
      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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2705 2706
			      (lex->wild ? lex->wild->ptr() : NullS),
			      lex->verbose);
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2707 2708 2709 2710 2711
      break;
    }
#endif
  case SQLCOM_SHOW_KEYS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2712
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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2713 2714 2715
    DBUG_VOID_RETURN;
#else
    {
2716
      char *db=tables->db;
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2717 2718
      if (!db)
      {
2719
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
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2720 2721 2722
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);			// Fix escaped '_'
2723
      remove_escape(tables->real_name);
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2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735
      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:
2736
    mysql_change_db(thd,select_lex->db);
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2737
    break;
2738
#ifndef EMBEDDED_LIBRARY
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2739 2740 2741
  case SQLCOM_LOAD:
  {
    uint privilege= (lex->duplicates == DUP_REPLACE ?
2742
		     INSERT_ACL | DELETE_ACL : INSERT_ACL);
2743 2744

    if (!lex->local_file)
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bk@work.mysql.com committed
2745 2746 2747 2748 2749 2750
    {
      if (check_access(thd,privilege | FILE_ACL,tables->db))
	goto error;
    }
    else
    {
2751
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
2752
	  ! opt_local_infile)
2753
      {
2754
	send_error(thd,ER_NOT_ALLOWED_COMMAND);
2755 2756
	goto error;
      }
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2757
      if (check_access(thd,privilege,tables->db,&tables->grant.privilege) ||
2758
	  grant_option && check_grant(thd,privilege,tables))
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2759 2760 2761 2762 2763 2764
	goto error;
    }
    res=mysql_load(thd, lex->exchange, tables, lex->field_list,
		   lex->duplicates, (bool) lex->local_file, lex->lock_option);
    break;
  }
2765
#endif /* EMBEDDED_LIBRARY */
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2766
  case SQLCOM_SET_OPTION:
2767 2768 2769 2770 2771
    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)))
2772
      send_ok(thd);
2773 2774
    if (thd->net.report_error)
      res= -1;
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2775
    break;
2776

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bk@work.mysql.com committed
2777
  case SQLCOM_UNLOCK_TABLES:
2778
    unlock_locked_tables(thd);
2779 2780
    if (thd->options & OPTION_TABLE_LOCK)
    {
2781
      end_active_trans(thd);
2782
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
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2783 2784
    }
    if (thd->global_read_lock)
2785
      unlock_global_read_lock(thd);
2786
    send_ok(thd);
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2787 2788
    break;
  case SQLCOM_LOCK_TABLES:
2789
    unlock_locked_tables(thd);
2790
    if (check_db_used(thd,tables) || end_active_trans(thd))
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bk@work.mysql.com committed
2791
      goto error;
2792
    if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, tables))
2793
      goto error;
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2794
    thd->in_lock_tables=1;
2795
    thd->options|= OPTION_TABLE_LOCK;
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2796 2797 2798 2799
    if (!(res=open_and_lock_tables(thd,tables)))
    {
      thd->locked_tables=thd->lock;
      thd->lock=0;
2800
      send_ok(thd);
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2801
    }
2802 2803
    else
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
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    thd->in_lock_tables=0;
    break;
  case SQLCOM_CREATE_DB:
2807
  {
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2808
    if (!strip_sp(lex->name) || check_db_name(lex->name))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2809
    {
2810
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
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bk@work.mysql.com committed
2811 2812
      break;
    }
2813 2814 2815 2816 2817 2818 2819
    /*
      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.
    */
2820
#ifdef HAVE_REPLICATION
2821 2822 2823 2824
    if (thd->slave_thread && 
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
      break;
2825
#endif
2826 2827
    if (check_access(thd,CREATE_ACL,lex->name,0,1))
      break;
2828
    res=mysql_create_db(thd,lex->name,&lex->create_info,0);
2829 2830
    break;
  }
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bk@work.mysql.com committed
2831
  case SQLCOM_DROP_DB:
2832
  {
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monty@hundin.mysql.fi committed
2833
    if (!strip_sp(lex->name) || check_db_name(lex->name))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2834
    {
2835
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
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bk@work.mysql.com committed
2836 2837
      break;
    }
2838 2839 2840 2841 2842 2843 2844
    /*
      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.
    */
2845
#ifdef HAVE_REPLICATION
2846 2847 2848 2849
    if (thd->slave_thread && 
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
      break;
2850
#endif
2851
    if (check_access(thd,DROP_ACL,lex->name,0,1))
2852
      break;
2853 2854
    if (thd->locked_tables || thd->active_transaction())
    {
2855
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
2856 2857
      goto error;
    }
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monty@hundin.mysql.fi committed
2858
    res=mysql_rm_db(thd,lex->name,lex->drop_if_exists,0);
2859 2860
    break;
  }
2861 2862 2863 2864
  case SQLCOM_ALTER_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
2865
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
2866 2867
      break;
    }
2868
    if (check_access(thd,ALTER_ACL,lex->name,0,1))
2869 2870 2871
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
2872
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
2873 2874
      goto error;
    }
2875
    res=mysql_alter_db(thd,lex->name,&lex->create_info);
2876 2877
    break;
  }
2878 2879 2880 2881
  case SQLCOM_SHOW_CREATE_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
2882
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
2883 2884 2885 2886 2887 2888
      break;
    }
    if (check_access(thd,DROP_ACL,lex->name,0,1))
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
2889
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
2890 2891
      goto error;
    }
2892
    res=mysqld_show_create_db(thd,lex->name,&lex->create_info);
2893 2894
    break;
  }
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2895 2896 2897 2898 2899
  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)))
2900
      send_ok(thd);
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bk@work.mysql.com committed
2901 2902 2903 2904 2905 2906 2907 2908
#else
    res= -1;
#endif
    break;
  case SQLCOM_DROP_FUNCTION:
    if (check_access(thd,DELETE_ACL,"mysql",0,1))
      break;
#ifdef HAVE_DLOPEN
2909
    if (!(res = mysql_drop_function(thd,&lex->udf.name)))
2910
      send_ok(thd);
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bk@work.mysql.com committed
2911 2912 2913 2914
#else
    res= -1;
#endif
    break;
2915 2916 2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946
  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;
  }
2947 2948 2949 2950 2951 2952 2953 2954 2955
  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;

2956 2957 2958 2959
    /*
      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
    */
2960 2961 2962 2963 2964 2965 2966 2967 2968 2969

    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 &&
2970
	     my_strcasecmp(&my_charset_latin1,
2971
                           user->host.str, thd->host_or_ip)))
2972 2973 2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985
	{
	  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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monty@hundin.mysql.fi committed
2986 2987 2988
      if (!(res = mysql_table_grant(thd,tables,lex->users_list, lex->columns,
				    lex->grant,
				    lex->sql_command == SQLCOM_REVOKE)))
2989
      {
2990
	mysql_update_log.write(thd, thd->query, thd->query_length);
2991 2992
	if (mysql_bin_log.is_open())
	{
2993
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
2994 2995 2996 2997 2998 2999 3000 3001
	  mysql_bin_log.write(&qinfo);
	}
      }
    }
    else
    {
      if (lex->columns.elements)
      {
3002
	send_error(thd,ER_ILLEGAL_GRANT_FOR_TABLE);
3003 3004 3005 3006 3007 3008 3009
	res=1;
      }
      else
	res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
			  lex->sql_command == SQLCOM_REVOKE);
      if (!res)
      {
3010
	mysql_update_log.write(thd, thd->query, thd->query_length);
3011 3012
	if (mysql_bin_log.is_open())
	{
3013
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
3014 3015
	  mysql_bin_log.write(&qinfo);
	}
3016
	if (mqh_used && lex->sql_command == SQLCOM_GRANT)
3017
	{
3018 3019 3020
	  List_iterator <LEX_USER> str_list(lex->users_list);
	  LEX_USER *user;
	  while ((user=str_list++))
3021
	    reset_mqh(thd,user);
3022
	}
3023 3024 3025 3026
      }
    }
    break;
  }
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3027
  case SQLCOM_RESET:
3028 3029 3030 3031 3032 3033 3034
    /* 
       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:
  {
3035
    if (check_global_access(thd,RELOAD_ACL) || check_db_used(thd, tables))
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bk@work.mysql.com committed
3036
      goto error;
3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060
    /*
      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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3061
    break;
3062
  }
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3063 3064 3065 3066 3067
  case SQLCOM_KILL:
    kill_one_thread(thd,lex->thread_id);
    break;
  case SQLCOM_SHOW_GRANTS:
    res=0;
3068 3069
    if ((thd->priv_user &&
	 !strcmp(thd->priv_user,lex->grant_user->user.str)) ||
3070
	!check_access(thd, SELECT_ACL, "mysql",0,1))
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3071 3072 3073 3074
    {
      res = mysql_show_grants(thd,lex->grant_user);
    }
    break;
3075
  case SQLCOM_HA_OPEN:
3076 3077
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL, tables))
3078 3079 3080 3081 3082 3083 3084 3085 3086
      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:
3087 3088
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL, tables))
3089
      goto error;
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3090
    res = mysql_ha_read(thd, tables, lex->ha_read_mode, lex->backup_dir,
3091 3092
			lex->insert_list, lex->ha_rkey_mode, select_lex->where,
			select_lex->select_limit, select_lex->offset_limit);
3093 3094
    break;

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3095
  case SQLCOM_BEGIN:
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3096 3097 3098 3099 3100 3101
    if (thd->locked_tables)
    {
      thd->lock=thd->locked_tables;
      thd->locked_tables=0;			// Will be automaticly closed
      close_thread_tables(thd);			// Free tables
    }
3102 3103 3104 3105 3106 3107
    if (end_active_trans(thd))
    {
      res= -1;
    }
    else
    {
3108
      thd->options= ((thd->options & (ulong) ~(OPTION_STATUS_NO_TRANS_UPDATE)) |
3109 3110
		     OPTION_BEGIN);
      thd->server_status|= SERVER_STATUS_IN_TRANS;
3111
      send_ok(thd);
3112
    }
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3113 3114
    break;
  case SQLCOM_COMMIT:
3115 3116 3117 3118 3119
    /*
      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...)
    */
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3120
  {
3121
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
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bk@work.mysql.com committed
3122 3123
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    if (!ha_commit(thd))
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monty@hundin.mysql.fi committed
3124
    {
3125
      send_ok(thd);
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3126
    }
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    else
      res= -1;
    break;
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3130
  }
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3131 3132 3133
  case SQLCOM_ROLLBACK:
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    if (!ha_rollback(thd))
3134 3135
    {
      if (thd->options & OPTION_STATUS_NO_TRANS_UPDATE)
3136
	send_warning(thd,ER_WARNING_NOT_COMPLETE_ROLLBACK,0);
3137
      else
3138
	send_ok(thd);
3139
    }
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3140 3141
    else
      res= -1;
3142
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
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bk@work.mysql.com committed
3143 3144
    break;
  default:					/* Impossible */
3145
    send_ok(thd);
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3146 3147 3148 3149
    break;
  }
  thd->proc_info="query end";			// QQ
  if (res < 0)
3150
    send_error(thd,thd->killed ? ER_SERVER_SHUTDOWN : 0);
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3151 3152 3153 3154 3155 3156

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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3197
/****************************************************************************
3198
  Get the user (global) and database privileges for all used tables
3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211

  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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3212 3213
                is enough to satisfy the request and the global grants contains
                a SELECT grant.
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3214 3215 3216
****************************************************************************/

bool
3217
check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
3218
	     bool dont_check_global_grants, bool no_errors)
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3219
{
3220 3221 3222 3223
  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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3224 3225 3226 3227 3228
  if (save_priv)
    *save_priv=0;
  else
    save_priv= &dummy;

3229
  if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
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3230
  {
3231
    if (!no_errors)
3232
      send_error(thd,ER_NO_DB_ERROR);	/* purecov: tested */
3233
    DBUG_RETURN(TRUE);				/* purecov: tested */
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  }

  if ((thd->master_access & want_access) == want_access)
  {
3238 3239 3240 3241 3242 3243 3244 3245 3246 3247 3248
    /*
      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,
			thd->priv_user, db); /* purecov: inspected */
    *save_priv=thd->master_access | db_access;
3249
    DBUG_RETURN(FALSE);
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  }
3251
  if (((want_access & ~thd->master_access) & ~(DB_ACLS | EXTRA_ACL)) ||
3252
      ! db && dont_check_global_grants)
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3253
  {						// We can never grant this
3254
    if (!no_errors)
3255
      net_printf(thd,ER_ACCESS_DENIED_ERROR,
3256
		 thd->priv_user,
3257
		 thd->priv_host,
3258
		 thd->password ? ER(ER_YES) : ER(ER_NO));/* purecov: tested */
3259
    DBUG_RETURN(TRUE);				/* purecov: tested */
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  }

  if (db == any_db)
3263
    DBUG_RETURN(FALSE);				// Allow select on anything
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3264

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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,
		      thd->priv_user, db); /* purecov: inspected */
  else
    db_access=thd->db_access;
3270 3271
  // 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);
3273 3274

  /* grant_option is set if there exists a single table or column grant */
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3275
  if (db_access == want_access ||
3276 3277
      ((grant_option && !dont_check_global_grants) &&
       !(want_access & ~TABLE_ACLS)))
3278
    DBUG_RETURN(FALSE);				/* Ok */
3279
  if (!no_errors)
3280
    net_printf(thd,ER_DBACCESS_DENIED_ERROR,
3281
	       thd->priv_user,
3282
	       thd->priv_host,
3283
	       db ? db : thd->db ? thd->db : "unknown"); /* purecov: tested */
3284
  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
*/
3306 3307

bool check_global_access(THD *thd, ulong want_access)
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{
3309
  char command[128];
3310
  if ((thd->master_access & want_access))
3311 3312
    return 0;
  get_privilege_desc(command, sizeof(command), want_access);
3313
  net_printf(thd,ER_SPECIFIC_ACCESS_DENIED_ERROR,
3314 3315
	     command);
  return 1;
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}


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3319
/*
3320 3321
  Check the privilege for all used tables.  Table privileges are cached
  in the table list for GRANT checking
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*/

3324
bool
3325
check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables,
3326
		   bool no_errors)
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{
3328 3329
  uint found=0;
  ulong found_access=0;
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  TABLE_LIST *org_tables=tables;
  for (; tables ; tables=tables->next)
  {
3333
    if (tables->derived || (tables->table && (int)tables->table->tmp_table))
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3334
      continue;
3335 3336
    if ((thd->master_access & want_access) == (want_access & ~EXTRA_ACL) &&
	thd->db)
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      tables->grant.privilege= want_access;
3338
    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
      {
3344 3345
	if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
			 0, no_errors))
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3346 3347
	  return TRUE;				// Access denied
	found_access=tables->grant.privilege;
3348
	found=1;
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      }
    }
3351
    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
3352
			  0, no_errors))
3353
      return TRUE;
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  }
  if (grant_option)
3356
    return check_grant(thd,want_access & ~EXTRA_ACL,org_tables,
3357
		       test(want_access & EXTRA_ACL), no_errors);
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  return FALSE;
}


3362
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))
      {
3370
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: tested */
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	return TRUE;				/* purecov: tested */
      }
    }
  }
  return FALSE;
}


3379 3380
static bool check_merge_table_access(THD *thd, char *db,
				     TABLE_LIST *table_list)
3381 3382 3383 3384
{
  int error=0;
  if (table_list)
  {
3385
    /* Check that all tables use the current database */
3386 3387
    TABLE_LIST *tmp;
    for (tmp=table_list; tmp ; tmp=tmp->next)
3388 3389 3390
    {
      if (!tmp->db || !tmp->db[0])
	tmp->db=db;
3391
      else if (strcmp(tmp->db,db))
3392
      {
3393
	send_error(thd,ER_UNION_TABLES_IN_DIFFERENT_DIR);
3394 3395 3396
	return 1;
      }
    }
3397 3398 3399 3400 3401 3402 3403
    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

3414
#ifndef EMBEDDED_LIBRARY
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3415 3416 3417 3418 3419 3420 3421 3422
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));
3423
    thd->fatal_error();
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    return 1;
  }
  return 0;
}
3428
#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;
}


/****************************************************************************
3463
  Initialize global thd variables needed for query
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3464 3465
****************************************************************************/

3466
void
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3467 3468 3469
mysql_init_query(THD *thd)
{
  DBUG_ENTER("mysql_init_query");
3470 3471 3472
  LEX *lex=&thd->lex;
  lex->unit.init_query();
  lex->unit.init_select();
3473
  lex->unit.thd= thd;
3474 3475 3476
  lex->select_lex.init_query();
  lex->value_list.empty();
  lex->param_list.empty();
3477 3478
  lex->unit.next= lex->unit.master= lex->unit.return_to= 
    lex->unit.link_next= 0;
3479
  lex->unit.prev= lex->unit.link_prev= 0;
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3480
  lex->unit.global_parameters= lex->unit.slave= lex->current_select=
3481
    lex->all_selects_list= &lex->select_lex;
3482 3483
  lex->select_lex.master= &lex->unit;
  lex->select_lex.prev= &lex->unit.slave;
3484
  lex->select_lex.link_next= lex->select_lex.slave= lex->select_lex.next= 0;
3485
  lex->select_lex.link_prev= (st_select_lex_node**)&(lex->all_selects_list);
3486 3487
  lex->describe= 0;
  lex->derived_tables= FALSE;
3488 3489
  lex->lock_option= TL_READ;
  lex->found_colon= 0;
3490
  lex->safe_to_cache_query= 1;
3491
  thd->select_number= lex->select_lex.select_number= 1;
3492
  thd->free_list= 0;
3493
  thd->total_warn_count=0;			// Warnings for this query
3494 3495
  thd->last_insert_id_used= thd->query_start_used= thd->insert_id_used=0;
  thd->sent_row_count= thd->examined_row_count= 0;
3496
  thd->is_fatal_error= thd->rand_used= 0;
3497
  thd->server_status &= ~SERVER_MORE_RESULTS_EXISTS;
3498
  thd->tmp_table_used= 0;
3499 3500
  if (opt_bin_log)
    reset_dynamic(&thd->user_var_events);
3501
  thd->clear_error();
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3502 3503 3504
  DBUG_VOID_RETURN;
}

3505

3506 3507 3508
void
mysql_init_select(LEX *lex)
{
3509
  SELECT_LEX *select_lex= lex->current_select->select_lex();
3510
  select_lex->init_select();
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3511
  select_lex->master_unit()->select_limit= select_lex->select_limit=
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3512
    lex->thd->variables.select_limit;
3513 3514 3515 3516 3517 3518
  if (select_lex == &lex->select_lex)
  {
    lex->exchange= 0;
    lex->result= 0;
    lex->proc_list.first= 0;
  }
3519 3520
}

3521

3522
bool
3523
mysql_new_select(LEX *lex, bool move_down)
3524
{
3525
  SELECT_LEX *select_lex = new SELECT_LEX();
3526 3527
  if (!select_lex)
    return 1;
3528
  select_lex->select_number= ++lex->thd->select_number;
3529 3530 3531 3532 3533
  select_lex->init_query();
  select_lex->init_select();
  if (move_down)
  {
    /* first select_lex of subselect or derived table */
3534
    SELECT_LEX_UNIT *unit= new SELECT_LEX_UNIT();
3535 3536 3537 3538
    if (!unit)
      return 1;
    unit->init_query();
    unit->init_select();
3539
    unit->thd= lex->thd;
3540 3541 3542 3543
    if (lex->current_select->linkage == GLOBAL_OPTIONS_TYPE)
      unit->include_neighbour(lex->current_select);
    else
      unit->include_down(lex->current_select);
3544 3545
    unit->link_next= 0;
    unit->link_prev= 0;
3546
    unit->return_to= lex->current_select;
3547 3548 3549
    select_lex->include_down(unit);
  }
  else
3550
    select_lex->include_neighbour(lex->current_select);
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3551

3552
  select_lex->master_unit()->global_parameters= select_lex;
3553
  select_lex->include_global((st_select_lex_node**)&lex->all_selects_list);
3554
  lex->current_select= select_lex;
3555
  return 0;
3556
}
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3557

3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580
/*
  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)
{
  LEX *lex;
  LEX_STRING tmp;
  DBUG_ENTER("create_select_for_variable");
  lex= current_lex;
  mysql_init_select(lex);
  lex->sql_command= SQLCOM_SELECT;
  tmp.str= (char*) var_name;
  tmp.length=strlen(var_name);
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3581
  add_item_to_list(lex->thd, get_system_var(OPT_SESSION, tmp));
3582 3583 3584
  DBUG_VOID_RETURN;
}

3585

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3586 3587
void mysql_init_multi_delete(LEX *lex)
{
3588
  lex->sql_command=  SQLCOM_DELETE_MULTI;
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3589
  mysql_init_select(lex);
3590
  lex->select_lex.select_limit= lex->unit.select_limit_cnt=
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3591
    HA_POS_ERROR;
3592
  lex->auxilliary_table_list= lex->select_lex.table_list;
3593
  lex->select_lex.table_list.empty();
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3594
}
3595

3596

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3597
void
3598
mysql_parse(THD *thd, char *inBuf, uint length)
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{
  DBUG_ENTER("mysql_parse");

  mysql_init_query(thd);
3603
  if (query_cache_send_result_to_client(thd, inBuf, length) <= 0)
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  {
    LEX *lex=lex_start(thd, (uchar*) inBuf, length);
3606
    if (!yyparse((void *)thd) && ! thd->is_fatal_error)
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3607
    {
3608
      if (mqh_used && thd->user_connect &&
3609
	  check_mqh(thd, lex->sql_command))
3610 3611 3612 3613 3614
      {
	thd->net.error = 0;
      }
      else
      {
3615 3616 3617 3618 3619
	if (thd->net.report_error)
	  send_error(thd, 0, NullS);
	else
	{
	  mysql_execute_command(thd);
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3620
#ifndef EMBEDDED_LIBRARY  /* TODO query cache in embedded library*/
3621
	  query_cache_end_of_result(&thd->net);
3622
#endif
3623
	}
3624
      }
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3625 3626
    }
    else
3627 3628
    {
      DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
3629
			 thd->is_fatal_error));
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3630
#ifndef EMBEDDED_LIBRARY   /* TODO query cache in embedded library*/
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3631
      query_cache_abort(&thd->net);
3632
#endif
3633
    }
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3634
    thd->proc_info="freeing items";
3635
    free_items(thd->free_list);  /* Free strings used by items */
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3636 3637
    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;
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  char warn_buff[MYSQL_ERRMSG_SIZE];
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  DBUG_ENTER("add_field_to_list");

  if (strlen(field_name) > NAME_LEN)
  {
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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));
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    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));
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    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();
  }

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  if (default_value)
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  {
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    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;
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  new_field->def= default_value;
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  new_field->flags= type_modifier;
  new_field->unireg_check= (type_modifier & AUTO_INCREMENT_FLAG ?
			    Field::NEXT_NUMBER : Field::NONE);
  new_field->decimals= decimals ? (uint) set_zone(atoi(decimals),0,
						  NOT_FIXED_DEC-1) : 0;
  new_field->sql_type=type;
  new_field->length=0;
  new_field->change=change;
  new_field->interval=0;
  new_field->pack_length=0;
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  new_field->charset=cs;
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  new_field->geom_type= (Field::geometry_type) uint_geom_type;
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  if (!comment)
  {
    new_field->comment.str=0;
    new_field->comment.length=0;
  }
  else
  {
    /* In this case comment is always of type Item_string */
    new_field->comment.str=   (char*) comment->str_value.ptr();
    new_field->comment.length=comment->str_value.length();
  }
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  if (length && !(new_field->length= (uint) atoi(length)))
    length=0; /* purecov: inspected */
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  uint sign_len=type_modifier & UNSIGNED_FLAG ? 0 : 1;

  if (new_field->length && new_field->decimals &&
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      new_field->length < new_field->decimals+1 &&
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      new_field->decimals != NOT_FIXED_DEC)
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    new_field->length=new_field->decimals+1; /* purecov: inspected */
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  switch (type) {
  case FIELD_TYPE_TINY:
    if (!length) new_field->length=3+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_SHORT:
    if (!length) new_field->length=5+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_INT24:
    if (!length) new_field->length=8+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_LONG:
    if (!length) new_field->length=10+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_LONGLONG:
    if (!length) new_field->length=20;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_NULL:
    break;
  case FIELD_TYPE_DECIMAL:
    if (!length)
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      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;
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  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");
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    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_AUTO_CONVERT,
		 warn_buff);
    /* fall through */
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  case FIELD_TYPE_BLOB:
  case FIELD_TYPE_TINY_BLOB:
  case FIELD_TYPE_LONG_BLOB:
  case FIELD_TYPE_MEDIUM_BLOB:
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  case FIELD_TYPE_GEOMETRY:
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    if (new_field->length)
    {
      /* The user has given a length to the blob column */
      if (new_field->length < 256)
	type= FIELD_TYPE_TINY_BLOB;
      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())
      {
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	net_printf(thd,ER_BLOB_CANT_HAVE_DEFAULT,field_name); /* purecov: inspected */
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	DBUG_RETURN(1); /* purecov: inspected */
      }
      new_field->def=0;
    }
    new_field->flags|=BLOB_FLAG;
    break;
  case FIELD_TYPE_YEAR:
    if (!length || new_field->length != 2)
      new_field->length=4;			// Default length
    new_field->flags|= ZEROFILL_FLAG | UNSIGNED_FLAG;
    break;
  case FIELD_TYPE_FLOAT:
    /* change FLOAT(precision) to FLOAT or DOUBLE */
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    if (length && !decimals)
    {
      uint tmp_length=new_field->length;
      if (tmp_length > PRECISION_FOR_DOUBLE)
      {
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	net_printf(thd,ER_WRONG_FIELD_SPEC,field_name);
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	DBUG_RETURN(1);
      }
      else if (tmp_length > PRECISION_FOR_FLOAT)
      {
	new_field->sql_type=FIELD_TYPE_DOUBLE;
	new_field->length=DBL_DIG+7;			// -[digits].E+###
      }
      else
	new_field->length=FLT_DIG+6;			// -[digits].E+##
      new_field->decimals= NOT_FIXED_DEC;
      break;
    }
    if (!length)
    {
      new_field->length =  FLT_DIG+6;
      new_field->decimals= NOT_FIXED_DEC;
    }
    break;
  case FIELD_TYPE_DOUBLE:
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    if (!length)
    {
      new_field->length = DBL_DIG+7;
      new_field->decimals=NOT_FIXED_DEC;
    }
    break;
  case FIELD_TYPE_TIMESTAMP:
    if (!length)
      new_field->length= 14;			// Full date YYYYMMDDHHMMSS
    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)
      {
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	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;
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  bool not_used3;
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	thd->cuted_fields=0;
	String str,*res;
	res=default_value->val_str(&str);
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	(void) find_set(interval, res->ptr(), res->length(), &not_used,
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			&not_used2, &not_used3);
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	if (thd->cuted_fields)
	{
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	  net_printf(thd,ER_INVALID_DEFAULT,field_name);
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	  DBUG_RETURN(1);
	}
      }
    }
    break;
  case FIELD_TYPE_ENUM:
    {
      new_field->interval=interval;
      new_field->pack_length=interval->count < 256 ? 1 : 2; // Should be safe
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      new_field->length=(uint) strip_sp((char*) interval->type_names[0]);
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      for (const char **pos=interval->type_names+1; *pos ; pos++)
      {
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	uint length=(uint) strip_sp((char*) *pos);
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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()))
	{
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	  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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  {
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    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)
  {
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    net_printf(thd,ER_WRONG_FIELD_SPEC,field_name);
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    DBUG_RETURN(1);
  }
  if (!new_field->pack_length)
    new_field->pack_length=calc_pack_length(new_field->sql_type ==
					    FIELD_TYPE_VAR_STRING ?
					    FIELD_TYPE_STRING :
					    new_field->sql_type,
					    new_field->length);
  lex->create_list.push_back(new_field);
  lex->last_field=new_field;
  DBUG_RETURN(0);
}

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

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

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

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  if (!(order = (ORDER *) thd->alloc(sizeof(ORDER)+sizeof(Item*))))
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    return 1;
  item_ptr = (Item**) (order+1);
  *item_ptr= item;
  order->item=item_ptr;
  order->free_me=0;
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  thd->lex.proc_list.link_in_list((byte*) order,(byte**) &order->next);
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  return 0;
}


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

static void remove_escape(char *name)
{
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  if (!*name)					// For empty DB names
    return;
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  char *to;
#ifdef USE_MB
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  char *strend=name+(uint) strlen(name);
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#endif
  for (to=name; *name ; name++)
  {
#ifdef USE_MB
    int l;
/*    if ((l = ismbchar(name, name+MBMAXLEN))) { Wei He: I think it's wrong */
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    if (use_mb(system_charset_info) &&
        (l = my_ismbchar(system_charset_info, name, strend)))
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    {
	while (l--)
	    *to++ = *name++;
	name--;
	continue;
    }
#endif
    if (*name == '\\' && name[1])
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      name++;					// Skip '\\'
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    *to++= *name;
  }
  *to=0;
}

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


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bool add_to_list(THD *thd, SQL_LIST &list,Item *item,bool asc)
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{
  ORDER *order;
  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)
  {
4246
    acl_reload(thd);
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    grant_reload(thd);
4248
    if (mqh_used)
4249
      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
4263
    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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    }
4269
#endif
4270
    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))
  {
4284
    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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  {
4293
    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();
4308
#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;
 }
4332
#endif
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 if (options & REFRESH_USER_RESOURCES)
4334
   reset_mqh(thd,(LEX_USER *) NULL);
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 if (write_to_binlog)
   *write_to_binlog= tmp_write_to_binlog;
4337
 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
*/

4353
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)
4382
    send_ok(thd);
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  else
4384
    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 */

4405
static bool append_file_to_dir(THD *thd, char **filename_ptr, char *table_name)
4406
{
4407
  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;
}
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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;
4442
  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;
}