sql_parse.cc 134 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 "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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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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static bool check_merge_table_access(THD *thd, char *db, TABLE_LIST *tables);
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static bool single_table_command_access(THD *thd, ulong privilege,
					TABLE_LIST *tables, int *res);
#else
#define check_merge_table_access(thd, db, tables) false
#define single_table_command_access(thd, privilege, tables, res) false
#endif
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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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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;

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/*
  get_or_create_user_conn()

  RETURN VALUE
    0  OK; thd->user_connect is set, thd->user_connect->connections is
    incremented by one (so that the user_connect object cannot be dropped
    while we are using it)
    1  error
*/

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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;	/* Another BUG FIX by Heikki Oct 26, 2003 */
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    uc->questions=uc->updates=uc->conn_per_hour=0;
    uc->user_resources=*mqh;
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    if (max_user_connections && mqh->connections > max_user_connections)
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      uc->user_resources.connections = max_user_connections;
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    uc->intime=thd->thr_create_time;
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    if (my_hash_insert(&hash_user_connections, (byte*) uc))
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    {
      my_free((char*) uc,0);
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      send_error(thd, 0, NullS);		// Out of memory
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      return_val=1;
      goto end;
    }
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  } else {
    uc->connections++;		/* BUG FIX by Heikki Oct 26, 2003 */
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  }
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  thd->user_connect=uc;
end:
  (void) pthread_mutex_unlock(&LOCK_user_conn);
  return return_val;
}
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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/*
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    Check if user exist and password supplied is correct. 
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  SYNOPSIS
    check_user()
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    thd          thread handle, thd->{host,user,ip} are used
    command      originator of the check: now check_user is called
                 during connect and change user procedures; used for 
                 logging.
    passwd       scrambled password recieved from client
    passwd_len   length of scrambled password
    db           database name to connect to, may be NULL
    check_count  dont know exactly

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

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

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

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

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

      /* Don't allow user to connect if he has done too many queries */
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      /*
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      BUG FIXes by Heikki Oct 26, 2003
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      NOTE that the call get_or_create_user_conn() increments the connection
      count by 1 if it succeeds! This is to prevent the dropping of the
      thd->user_connect object before we check the connection limits in
      check_for_max_user_connections.
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      */

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      if (get_or_create_user_conn(thd,thd->user,thd->host_or_ip,&ur))
       DBUG_RETURN(1);

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      if (thd->user_connect &&
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          check_for_max_user_connections(thd, thd->user_connect))
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      { 
	decrease_user_connections(thd->user_connect);

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        DBUG_RETURN(1);
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      }
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      /* Change database if necessary: OK or FAIL is sent in mysql_change_db */
      if (db && db[0])
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      {
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        if (mysql_change_db(thd, db))
        {
          if (thd->user_connect)
            decrease_user_connections(thd->user_connect);
          DBUG_RETURN(-1);
        }
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      }
      else
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        send_ok(thd);
      thd->password= test(passwd_len);          // remember for error messages 
      /* Ready to handle queries */
      DBUG_RETURN(0);
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    }
  }
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  else if (res == 2) // client gave short hash, server has long hash
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  {
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    net_printf(thd, ER_NOT_SUPPORTED_AUTH_MODE);
    mysql_log.write(thd,COM_CONNECT,ER(ER_NOT_SUPPORTED_AUTH_MODE));
    DBUG_RETURN(-1);
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  }
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  net_printf(thd, ER_ACCESS_DENIED_ERROR,
             thd->user,
             thd->host_or_ip,
             passwd_len ? ER(ER_YES) : ER(ER_NO));
  mysql_log.write(thd, COM_CONNECT, ER(ER_ACCESS_DENIED_ERROR),
                  thd->user,
                  thd->host_or_ip,
                  passwd_len ? ER(ER_YES) : ER(ER_NO));
  DBUG_RETURN(-1);
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}

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#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/
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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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  /*
  FIX by Heikki Oct 25, 2003: protect the operation with a mutex: is there
  a race condition here otherwise?
  */  

  (void) pthread_mutex_lock(&LOCK_user_conn);

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  if (max_user_connections &&
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      (max_user_connections < (uint) uc->connections))
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  {
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    net_printf(thd,ER_TOO_MANY_USER_CONNECTIONS, uc->user);
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    error=1;
    goto end;
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  }
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  if (uc->user_resources.connections &&
      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:
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  (void) pthread_mutex_unlock(&LOCK_user_conn);

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  DBUG_RETURN(error);
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}


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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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  /*
  FIX by Heikki Oct 25, 2003: protect the operation with a mutex: is there
  a race condition here otherwise?
  */  

  (void) pthread_mutex_lock(&LOCK_user_conn);

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  if (uc->connections == 0)
	printf("Error: trying to decrease user %s connections below zero!\n",
				                                 uc->user);
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  if ((!--uc->connections) && !mqh_used)
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  {
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    /* Last connection for user; delete it if we do not need the object
    for keeping maximum-queries-per-hour statistics (mqh) */
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    (void) hash_delete(&hash_user_connections,(byte*) uc);
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  }
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  (void) pthread_mutex_unlock(&LOCK_user_conn);

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  DBUG_VOID_RETURN;
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}

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

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/*
  Mark all commands that somehow changes a table
  This is used to check number of updates / hour
*/

char  uc_update_queries[SQLCOM_END];

void init_update_queries(void)
{
  uc_update_queries[SQLCOM_CREATE_TABLE]=1;
  uc_update_queries[SQLCOM_CREATE_INDEX]=1;
  uc_update_queries[SQLCOM_ALTER_TABLE]=1;
  uc_update_queries[SQLCOM_UPDATE]=1;
  uc_update_queries[SQLCOM_INSERT]=1;
  uc_update_queries[SQLCOM_INSERT_SELECT]=1;
  uc_update_queries[SQLCOM_DELETE]=1;
  uc_update_queries[SQLCOM_TRUNCATE]=1;
  uc_update_queries[SQLCOM_DROP_TABLE]=1;
  uc_update_queries[SQLCOM_LOAD]=1;
  uc_update_queries[SQLCOM_CREATE_DB]=1;
  uc_update_queries[SQLCOM_DROP_DB]=1;
  uc_update_queries[SQLCOM_REPLACE]=1;
  uc_update_queries[SQLCOM_REPLACE_SELECT]=1;
  uc_update_queries[SQLCOM_RENAME_TABLE]=1;
  uc_update_queries[SQLCOM_BACKUP_TABLE]=1;
  uc_update_queries[SQLCOM_RESTORE_TABLE]=1;
  uc_update_queries[SQLCOM_DELETE_MULTI]=1;
  uc_update_queries[SQLCOM_DROP_INDEX]=1;
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  uc_update_queries[SQLCOM_UPDATE_MULTI]=1;
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}

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

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static bool check_mqh(THD *thd, uint check_command)
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{
  bool error=0;
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  time_t check_time = thd->start_time ?  thd->start_time : time(NULL);
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  USER_CONN *uc=thd->user_connect;
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  DBUG_ENTER("check_mqh");
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  DBUG_ASSERT(uc != 0);
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  /* If more than a hour since last check, reset resource checking */
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  if (check_time  - uc->intime >= 3600)
  {
    (void) pthread_mutex_lock(&LOCK_user_conn);
    uc->questions=1;
    uc->updates=0;
    uc->conn_per_hour=0;
    uc->intime=check_time;
    (void) pthread_mutex_unlock(&LOCK_user_conn);
  }
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  /* Check that we have not done too many questions / hour */
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  if (uc->user_resources.questions &&
      uc->questions++ >= uc->user_resources.questions)
  {
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    net_printf(thd, ER_USER_LIMIT_REACHED, uc->user, "max_questions",
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	       (long) uc->user_resources.questions);
    error=1;
    goto end;
  }
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  if (check_command < (uint) SQLCOM_END)
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  {
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    /* Check that we have not done too many updates / hour */
    if (uc->user_resources.updates && uc_update_queries[check_command] &&
	uc->updates++ >= uc->user_resources.updates)
    {
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      net_printf(thd, ER_USER_LIMIT_REACHED, uc->user, "max_updates",
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		 (long) uc->user_resources.updates);
      error=1;
      goto end;
    }
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  }
end:
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  DBUG_RETURN(error);
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}

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static void reset_mqh(THD *thd, LEX_USER *lu, bool get_them= 0)
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{

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  (void) pthread_mutex_lock(&LOCK_user_conn);
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  if (lu)  // for GRANT
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  {
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    USER_CONN *uc;
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    uint temp_len=lu->user.length+lu->host.length+2;
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    char temp_user[USERNAME_LENGTH+HOSTNAME_LENGTH+2];

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

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

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

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

  thd->client_capabilities=uint2korr(net->read_pos);
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#ifdef TO_BE_REMOVED_IN_4_1_RELEASE
  /*
    This is just a safety check against any client that would use the old
    CLIENT_CHANGE_USER flag
  */
  if ((thd->client_capabilities & CLIENT_PROTOCOL_41) &&
      !(thd->client_capabilities & (CLIENT_RESERVED |
				    CLIENT_SECURE_CONNECTION |
				    CLIENT_MULTI_RESULTS)))
    thd->client_capabilities&= ~CLIENT_PROTOCOL_41;
#endif
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  if (thd->client_capabilities & CLIENT_PROTOCOL_41)
  {
    thd->client_capabilities|= ((ulong) uint2korr(net->read_pos+2)) << 16;
    thd->max_client_packet_length= uint4korr(net->read_pos+4);
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    DBUG_PRINT("info", ("client_character_set: %d", (uint) net->read_pos[8]));
    /*
      Use server character set and collation if
      - client has not specified a character set
      - client character set is the same as the servers
      - client character set doesn't exists in server
    */
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    if (!(thd->variables.character_set_client=
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	  get_charset((uint) net->read_pos[8], MYF(0))) ||
	!my_strcasecmp(&my_charset_latin1,
		       global_system_variables.character_set_client->name,
		       thd->variables.character_set_client->name))
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    {
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      thd->variables.character_set_client=
	global_system_variables.character_set_client;
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      thd->variables.collation_connection=
	global_system_variables.collation_connection;
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      thd->variables.character_set_results=
	global_system_variables.character_set_results;
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    }
    else
    {
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      thd->variables.character_set_results=
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      thd->variables.collation_connection= 
	thd->variables.character_set_client;
    }
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    thd->update_charset();
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    end= (char*) net->read_pos+32;
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  }
  else
  {
    thd->max_client_packet_length= uint3korr(net->read_pos+2);
    end= (char*) net->read_pos+5;
  }

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

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

  if (thd->client_capabilities & CLIENT_INTERACTIVE)
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    thd->variables.net_wait_timeout= thd->variables.net_interactive_timeout;
835
  if ((thd->client_capabilities & CLIENT_TRANSACTIONS) &&
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      opt_using_transactions)
    net->return_status= &thd->server_status;
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  net->read_timeout=(uint) thd->variables.net_read_timeout;
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  char *user= end;
  char *passwd= strend(user)+1;
842
  char *db= passwd;
843
  char db_buff[NAME_LEN+1];                     // buffer to store db in utf8 
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  /* 
    Old clients send null-terminated string as password; new clients send
    the size (1 byte) + string (not null-terminated). Hence in case of empty
    password both send '\0'.
  */
  uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ? 
    *passwd++ : strlen(passwd);
  db= thd->client_capabilities & CLIENT_CONNECT_WITH_DB ?
    db + passwd_len + 1 : 0;
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  /* Since 4.1 all database names are stored in utf8 */
  if (db)
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  {
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    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
                             system_charset_info,
                             db, strlen(db),
                             thd->charset())]= 0;
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    db= db_buff;
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  }
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  if (thd->user)
    x_free(thd->user);
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  if (!(thd->user= my_strdup(user, MYF(0))))
    return (ER_OUT_OF_RESOURCES);
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  return check_user(thd, COM_CONNECT, passwd, passwd_len, db, true);
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}

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

  pthread_detach_this_thread();

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

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

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

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

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    if ((error=check_connection(thd)))
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    {						// Wrong permissions
      if (error > 0)
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	net_printf(thd,error,thd->host_or_ip);
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#ifdef __NT__
      if (vio_type(net->vio) == VIO_TYPE_NAMEDPIPE)
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	my_sleep(1000);				/* must wait after eof() */
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#endif
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      statistic_increment(aborted_connects,&LOCK_status);
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933 934
      goto end_thread;
    }
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935 936 937
#ifdef __NETWARE__
    netware_reg_user(thd->ip, thd->user, "MySQL");
#endif
938
    if (thd->variables.max_join_size == HA_POS_ERROR)
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939 940 941 942
      thd->options |= OPTION_BIG_SELECTS;
    if (thd->client_capabilities & CLIENT_COMPRESS)
      net->compress=1;				// Use compression

943
    thd->proc_info=0;				// Remove 'login'
944
    thd->command=COM_SLEEP;
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945 946
    thd->version=refresh_version;
    thd->set_time();
947
    thd->init_for_queries();
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948 949 950 951 952
    while (!net->error && net->vio != 0 && !thd->killed)
    {
      if (do_command(thd))
	break;
    }
953 954
    if (thd->user_connect)
      decrease_user_connections(thd->user_connect);
955
    free_root(&thd->mem_root,MYF(0));
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956
    if (net->error && net->vio != 0 && net->report_error)
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957
    {
958
      if (!thd->killed && thd->variables.log_warnings)
959 960 961 962 963 964
	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)));
965
      send_error(thd,net->last_errno,NullS);
966
      statistic_increment(aborted_threads,&LOCK_status);
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967
    }
968 969 970 971
    else if (thd->killed)
    {
      statistic_increment(aborted_threads,&LOCK_status);
    }
972
    
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973
end_thread:
974
    close_connection(thd, 0, 1);
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975 976 977 978 979 980 981 982 983 984 985
    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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986 987
#endif /* EMBEDDED_LIBRARY */

988 989 990 991
/*
  Execute commands from bootstrap_file.
  Used when creating the initial grant tables
*/
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992

993
extern "C" pthread_handler_decl(handle_bootstrap,arg)
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994
{
995 996 997
  THD *thd=(THD*) arg;
  FILE *file=bootstrap_file;
  char *buff;
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998

999
  /* The following must be called before DBUG_ENTER */
1000
  if (my_thread_init() || thd->store_globals())
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1001
  {
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1002
#ifndef EMBEDDED_LIBRARY
1003
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
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1004
#endif
1005
    thd->fatal_error();
1006
    goto end;
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1007
  }
1008 1009
  DBUG_ENTER("handle_bootstrap");

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1010
#ifndef EMBEDDED_LIBRARY
1011 1012
  pthread_detach_this_thread();
  thd->thread_stack= (char*) &thd;
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1013
#if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__)
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1014
  sigset_t set;
1015 1016
  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
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1017
#endif
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1018
#endif /* EMBEDDED_LIBRARY */
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1019

1020
  if (thd->variables.max_join_size == HA_POS_ERROR)
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1021 1022 1023 1024
    thd->options |= OPTION_BIG_SELECTS;

  thd->proc_info=0;
  thd->version=refresh_version;
1025
  thd->priv_user=thd->user=(char*) my_strdup("boot", MYF(MY_WME));
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1026

1027
  buff= (char*) thd->net.buff;
1028
  thd->init_for_queries();
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1029 1030
  while (fgets(buff, thd->net.max_packet, file))
  {
1031
    uint length=(uint) strlen(buff);
1032
    while (length && (my_isspace(thd->charset(), buff[length-1]) ||
1033
           buff[length-1] == ';'))
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1034 1035
      length--;
    buff[length]=0;
1036
    thd->query_length=length;
1037 1038
    thd->query= thd->memdup_w_gap(buff, length+1, thd->db_length+1);
    thd->query[length] = '\0';
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1039
    thd->query_id=query_id++;
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1040
#ifndef NO_EMBEDDED_ACCESS_CHECKS
1041
    if (mqh_used && thd->user_connect && check_mqh(thd, SQLCOM_END))
1042 1043 1044 1045 1046 1047
    {
      thd->net.error = 0;
      close_thread_tables(thd);			// Free tables
      free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
      break;
    }
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1048
#endif
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1049 1050
    mysql_parse(thd,thd->query,length);
    close_thread_tables(thd);			// Free tables
1051
    if (thd->is_fatal_error)
1052
      break;
1053
    free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
1054
    free_root(&thd->transaction.mem_root,MYF(MY_KEEP_PREALLOC));
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1055
  }
1056 1057 1058

  /* thd->fatal_error should be set in case something went wrong */
end:
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1059
#ifndef EMBEDDED_LIBRARY
1060 1061 1062
  (void) pthread_mutex_lock(&LOCK_thread_count);
  thread_count--;
  (void) pthread_mutex_unlock(&LOCK_thread_count);
1063
  (void) pthread_cond_broadcast(&COND_thread_count);
1064 1065
  my_thread_end();
  pthread_exit(0);
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1066
#endif
1067
  DBUG_RETURN(0);				// Never reached
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1068 1069
}

1070
    /* This works because items are allocated with sql_alloc() */
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1071

1072
void free_items(Item *item)
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1073
{
1074
  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;
1085
  if (!(table_list = (TABLE_LIST*) thd->calloc(sizeof(TABLE_LIST))))
1086
    DBUG_RETURN(1); // out of memory
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1087
  table_list->db = db;
1088
  table_list->real_name = table_list->alias = tbl_name;
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1089 1090 1091
  table_list->lock_type = TL_READ_NO_INSERT;
  table_list->next = 0;

1092 1093
  if (!db || check_db_name(db))
  {
1094
    net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
1095 1096
    goto err;
  }
1097
  if (lower_case_table_names)
1098
    my_casedn_str(files_charset_info, tbl_name);
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1099
  remove_escape(table_list->real_name);
1100 1101 1102 1103

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

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1104 1105
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  if (check_access(thd, SELECT_ACL, db, &table_list->grant.privilege,0,0))
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1106
    goto err;
1107
  if (grant_option && check_grant(thd, SELECT_ACL, table_list))
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1108
    goto err;
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1109
#endif
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1110
  thd->free_list = 0;
1111
  thd->query_length=(uint) strlen(tbl_name);
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1112
  thd->query = tbl_name;
1113 1114
  if ((error = mysqld_dump_create_info(thd, table, -1)))
  {
1115
    my_error(ER_GET_ERRNO, MYF(0), my_errno);
1116 1117
    goto err;
  }
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1118
  net_flush(&thd->net);
1119
  if ((error= table->file->dump(thd,fd)))
1120
    my_error(ER_GET_ERRNO, MYF(0));
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1122 1123
err:
  close_thread_tables(thd);
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1124
  DBUG_RETURN(error);
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1125 1126 1127
}


1128
	/* Execute one command from socket (query or simple command) */
1129 1130

#ifndef EMBEDDED_LIBRARY
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1131 1132 1133
bool do_command(THD *thd)
{
  char *packet;
1134 1135
  uint old_timeout;
  ulong packet_length;
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1136 1137 1138 1139 1140
  NET *net;
  enum enum_server_command command;
  DBUG_ENTER("do_command");

  net= &thd->net;
1141 1142 1143 1144 1145
  /*
    indicator of uninitialized lex => normal flow of errors handling
    (see my_message_sql)
  */
  thd->lex.current_select= 0;
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1146 1147

  packet=0;
1148 1149 1150
  old_timeout=net->read_timeout;
  // Wait max for 8 hours
  net->read_timeout=(uint) thd->variables.net_wait_timeout;
1151
  thd->clear_error();				// Clear error message
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1152 1153 1154 1155

  net_new_transaction(net);
  if ((packet_length=my_net_read(net)) == packet_error)
  {
1156 1157 1158 1159 1160
    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)
1161 1162
    {
      statistic_increment(aborted_threads,&LOCK_status);
1163
      DBUG_RETURN(TRUE);			// We have to close it.
1164
    }
1165
    send_error(thd,net->last_errno,NullS);
1166
    net->error= 0;
1167
    DBUG_RETURN(FALSE);
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1168 1169 1170 1171 1172
  }
  else
  {
    packet=(char*) net->read_pos;
    command = (enum enum_server_command) (uchar) packet[0];
1173 1174
    if (command >= COM_END)
      command= COM_END;				// Wrong command
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1175 1176 1177
    DBUG_PRINT("info",("Command on %s = %d (%s)",
		       vio_description(net->vio), command,
		       command_name[command]));
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1178
  }
1179
  net->read_timeout=old_timeout;		// restore it
1180
  DBUG_RETURN(dispatch_command(command,thd, packet+1, (uint) packet_length));
1181
}
1182
#endif  /* EMBEDDED_LIBRARY */
1183

1184

1185 1186 1187 1188
bool dispatch_command(enum enum_server_command command, THD *thd,
		      char* packet, uint packet_length)
{
  NET *net= &thd->net;
1189
  bool error= 0;
1190 1191 1192 1193
  /*
    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
  */
1194 1195 1196
  bool slow_command=FALSE;
  DBUG_ENTER("dispatch_command");

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1197
  thd->command=command;
1198
  thd->set_time();
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  VOID(pthread_mutex_lock(&LOCK_thread_count));
  thd->query_id=query_id;
  if (command != COM_STATISTICS && command != COM_PING)
    query_id++;
  thread_running++;
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
1205

1206
  thd->lex.select_lex.options=0;		// We store status here
1207
  switch (command) {
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1208
  case COM_INIT_DB:
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1209 1210 1211 1212 1213 1214 1215 1216 1217
  {
    LEX_STRING tmp;
    statistic_increment(com_stat[SQLCOM_CHANGE_DB],&LOCK_status);
    thd->convert_string(&tmp, system_charset_info,
			packet, strlen(packet), thd->charset());
    if (!mysql_change_db(thd, tmp.str))
      mysql_log.write(thd,command,"%s",thd->db);
    break;
  }
1218
#ifdef HAVE_REPLICATION
1219 1220
  case COM_REGISTER_SLAVE:
  {
1221
    if (!register_slave(thd, (uchar*)packet, packet_length))
1222
      send_ok(thd);
1223 1224
    break;
  }
1225
#endif
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1226
  case COM_TABLE_DUMP:
1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240
  {
    char *db, *tbl_name;
    uint db_len= *(uchar*) packet;
    uint tbl_len= *(uchar*) (packet + db_len + 1);

    statistic_increment(com_other, &LOCK_status);
    slow_command= TRUE;
    db= thd->alloc(db_len + tbl_len + 2);
    tbl_name= strmake(db, packet + 1, db_len)+1;
    strmake(tbl_name, packet + db_len + 2, tbl_len);
    if (mysql_table_dump(thd, db, tbl_name, -1))
      send_error(thd); // dump to NET
    break;
  }
1241
#ifndef EMBEDDED_LIBRARY
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1242 1243
  case COM_CHANGE_USER:
  {
1244
    thd->change_user();
1245
    thd->clear_error();                         // if errors from rollback
1246

1247 1248
    statistic_increment(com_other, &LOCK_status);
    char *user= (char*) packet;
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    char *passwd= strend(user)+1;
1250 1251 1252 1253 1254
    /* 
      Old clients send null-terminated string ('\0' for empty string) for
      password.  New clients send the size (1 byte) + string (not null
      terminated, so also '\0' for empty string).
    */
1255
    char db_buff[NAME_LEN+1];                 // buffer to store db in utf8 
1256 1257 1258 1259
    char *db= passwd;
    uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ? 
      *passwd++ : strlen(passwd);
    db+= passwd_len + 1;
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1260
    /* Small check for incomming packet */
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1261
    if ((uint) ((uchar*) db - net->read_pos) > packet_length)
1262 1263 1264 1265
    {
      send_error(thd, ER_UNKNOWN_COM_ERROR);
      break;
    }
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1266

1267
    /* Convert database name to utf8 */
1268 1269 1270 1271
    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
                             system_charset_info, db, strlen(db),
                             thd->charset())]= 0;
    db= db_buff;
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1272

1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287
    /* Save user and privileges */
    uint save_master_access= thd->master_access;
    uint save_db_access= thd->db_access;
    uint save_db_length= thd->db_length;
    char *save_user= thd->user;
    char *save_priv_user= thd->priv_user;
    char *save_db= thd->db;
    USER_CONN *save_uc= thd->user_connect;
    thd->user= my_strdup(user, MYF(0));
    if (!thd->user)
    {
      thd->user= save_user;
      send_error(thd, ER_OUT_OF_RESOURCES);
      break;
    }
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1288

1289
    int res= check_user(thd, COM_CHANGE_USER, passwd, passwd_len, db, false);
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1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306
    if (res)
    {
      /* authentification failure, we shall restore old user */
      if (res > 0)
        send_error(thd, ER_UNKNOWN_COM_ERROR);
      x_free(thd->user);
      thd->user= save_user;
      thd->priv_user= save_priv_user;
      thd->master_access= save_master_access;
      thd->db_access= save_db_access;
      thd->db= save_db;
      thd->db_length= save_db_length;
    }
    else
    {
      /* we've authenticated new user */
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1307
      if (save_uc)  /* BUG FIX by Heikki Oct 26, 2003: always keep the count */
1308 1309 1310 1311
        decrease_user_connections(save_uc);
      x_free((gptr) save_db);
      x_free((gptr) save_user);
    }
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1312 1313
    break;
  }
1314
#endif /* EMBEDDED_LIBRARY */
1315 1316
  case COM_EXECUTE:
  {
1317
    mysql_stmt_execute(thd, packet);
1318 1319 1320 1321
    break;
  }
  case COM_LONG_DATA:
  {
1322
    mysql_stmt_get_longdata(thd, packet, packet_length);
1323 1324 1325 1326
    break;
  }
  case COM_PREPARE:
  {
1327
    mysql_stmt_prepare(thd, packet, packet_length);
1328 1329
    break;
  }
1330 1331 1332 1333 1334
  case COM_CLOSE_STMT:
  {
    mysql_stmt_free(thd, packet);
    break;
  }
1335 1336 1337 1338 1339
  case COM_RESET_STMT:
  {
    mysql_stmt_reset(thd, packet);
    break;
  }
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1340 1341
  case COM_QUERY:
  {
1342 1343
    if (alloc_query(thd, packet, packet_length))
      break;					// fatal error is set
1344
    mysql_log.write(thd,command,"%s",thd->query);
1345
    DBUG_PRINT("query",("%-.4096s",thd->query));
1346
    mysql_parse(thd,thd->query, thd->query_length);
1347

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1348
    while (!thd->killed && !thd->is_fatal_error && thd->lex.found_colon)
1349
    {
1350
      char *packet= thd->lex.found_colon;
1351 1352 1353 1354 1355 1356
      /* 
        Multiple queries exits, execute them individually
      */
      if (thd->lock || thd->open_tables || thd->derived_tables)
        close_thread_tables(thd);		

1357
      ulong length= thd->query_length-(ulong)(thd->lex.found_colon-thd->query);
1358 1359
      
      /* Remove garbage at start of query */
1360
      while (my_isspace(thd->charset(), *packet) && length > 0)
1361 1362 1363 1364 1365
      {
        packet++;
        length--;
      }
      thd->query_length= length;
1366 1367 1368 1369
      thd->query= packet;
      VOID(pthread_mutex_lock(&LOCK_thread_count));
      thd->query_id= query_id++;
      VOID(pthread_mutex_unlock(&LOCK_thread_count));
1370 1371 1372
      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;
  }
1378
  case COM_FIELD_LIST:				// This isn't actually needed
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1379
#ifdef DONT_ALLOW_SHOW_COMMANDS
1380
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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1381 1382 1383
    break;
#else
  {
1384
    char *fields, *pend;
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1385
    TABLE_LIST table_list;
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    LEX_STRING conv_name;

1388
    statistic_increment(com_stat[SQLCOM_SHOW_FIELDS],&LOCK_status);
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1389 1390 1391
    bzero((char*) &table_list,sizeof(table_list));
    if (!(table_list.db=thd->db))
    {
1392
      send_error(thd,ER_NO_DB_ERROR);
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1393 1394 1395
      break;
    }
    thd->free_list=0;
1396
    pend= strend(packet);
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1397 1398 1399
    thd->convert_string(&conv_name, system_charset_info,
			packet, (uint) (pend-packet), thd->charset());
    table_list.alias= table_list.real_name= conv_name.str;
1400
    packet= pend+1;
1401
    // command not cachable => no gap for data base name
1402 1403
    if (!(thd->query=fields=thd->memdup(packet,thd->query_length+1)))
      break;
1404
    mysql_log.write(thd,command,"%s %s",table_list.real_name,fields);
1405
    if (lower_case_table_names)
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1406
      my_casedn_str(files_charset_info, table_list.real_name);
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1407 1408
    remove_escape(table_list.real_name);	// This can't have wildcards

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1409 1410
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,SELECT_ACL,table_list.db,&thd->col_access,0,0))
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1411 1412 1413 1414
      break;
    table_list.grant.privilege=thd->col_access;
    if (grant_option && check_grant(thd,SELECT_ACL,&table_list,2))
      break;
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1415
#endif /*DONT_ALLOW_SHOW_COMMANDS*/
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1416
    mysqld_list_fields(thd,&table_list,fields);
1417
    free_items(thd->free_list);
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    break;
  }
#endif
  case COM_QUIT:
1422
    /* We don't calculate statistics for this command */
1423
    mysql_log.write(thd,command,NullS);
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    net->error=0;				// Don't give 'abort' message
    error=TRUE;					// End server
    break;

1428
  case COM_CREATE_DB:				// QQ: To be removed
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1429
    {
1430
      statistic_increment(com_stat[SQLCOM_CREATE_DB],&LOCK_status);
1431
      char *db=thd->strdup(packet);
1432
      // null test to handle EOM
1433
      if (!db || !strip_sp(db) || check_db_name(db))
1434
      {
1435
	net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
1436 1437
	break;
      }
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1438
      if (check_access(thd,CREATE_ACL,db,0,1,0))
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1439
	break;
1440
      mysql_log.write(thd,command,packet);
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1441
      mysql_create_db(thd,db,0,0);
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      break;
    }
1444
  case COM_DROP_DB:				// QQ: To be removed
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1445
    {
1446
      statistic_increment(com_stat[SQLCOM_DROP_DB],&LOCK_status);
1447
      char *db=thd->strdup(packet);
1448
      // null test to handle EOM
1449
      if (!db || !strip_sp(db) || check_db_name(db))
1450
      {
1451
	net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
1452 1453
	break;
      }
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1454
      if (check_access(thd,DROP_ACL,db,0,1,0))
1455
	break;
1456 1457
      if (thd->locked_tables || thd->active_transaction())
      {
1458
	send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
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1459
	break;
1460
      }
1461
      mysql_log.write(thd,command,db);
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1462
      mysql_rm_db(thd,db,0,0);
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      break;
    }
1465
#ifndef EMBEDDED_LIBRARY
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1466 1467
  case COM_BINLOG_DUMP:
    {
1468
      statistic_increment(com_other,&LOCK_status);
1469
      slow_command = TRUE;
1470
      if (check_global_access(thd, REPL_SLAVE_ACL))
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1471
	break;
1472
      mysql_log.write(thd,command, 0);
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1473

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      ulong pos;
      ushort flags;
1476
      uint32 slave_server_id;
1477
      /* TODO: The following has to be changed to an 8 byte integer */
1478 1479
      pos = uint4korr(packet);
      flags = uint2korr(packet + 4);
1480
      thd->server_id=0; /* avoid suicide */
1481
      if ((slave_server_id= uint4korr(packet+6))) // mysqlbinlog.server_id==0
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1482
	kill_zombie_dump_threads(slave_server_id);
1483
      thd->server_id = slave_server_id;
1484
      mysql_binlog_send(thd, thd->strdup(packet + 10), (my_off_t) pos, flags);
1485
      unregister_slave(thd,1,1);
1486 1487 1488
      // fake COM_QUIT -- if we get here, the thread needs to terminate
      error = TRUE;
      net->error = 0;
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      break;
    }
1491
#endif
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1492 1493
  case COM_REFRESH:
    {
1494
      statistic_increment(com_stat[SQLCOM_FLUSH],&LOCK_status);
1495
      ulong options= (ulong) (uchar) packet[0];
1496
      if (check_global_access(thd,RELOAD_ACL))
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1497
	break;
1498
      mysql_log.write(thd,command,NullS);
1499 1500 1501 1502
      if (reload_acl_and_cache(thd, options, (TABLE_LIST*) 0, NULL))
        send_error(thd, 0);
      else
        send_ok(thd);
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1503 1504
      break;
    }
1505
#ifndef EMBEDDED_LIBRARY
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1506
  case COM_SHUTDOWN:
1507
    statistic_increment(com_other,&LOCK_status);
1508
    if (check_global_access(thd,SHUTDOWN_ACL))
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1509 1510
      break; /* purecov: inspected */
    DBUG_PRINT("quit",("Got shutdown command"));
1511
    mysql_log.write(thd,command,NullS);
1512
    send_eof(thd);
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1513 1514 1515
#ifdef __WIN__
    sleep(1);					// must wait after eof()
#endif
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1516
#ifndef OS2
1517
    send_eof(thd);				// This is for 'quit request'
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1518
#endif
1519
    close_connection(thd, 0, 1);
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1520
    close_thread_tables(thd);			// Free before kill
1521
    free_root(&thd->mem_root,MYF(0));
1522
    free_root(&thd->transaction.mem_root,MYF(0));
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1523 1524 1525
    kill_mysql();
    error=TRUE;
    break;
1526
#endif
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1527 1528
  case COM_STATISTICS:
  {
1529
    mysql_log.write(thd,command,NullS);
1530
    statistic_increment(com_stat[SQLCOM_SHOW_STATUS],&LOCK_status);
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1531
#ifndef EMBEDDED_LIBRARY
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1532
    char buff[200];
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#else
    char *buff= thd->net.last_error;
#endif
1536
    ulong uptime = (ulong) (thd->start_time - start_time);
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1537
    sprintf((char*) buff,
1538
	    "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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1539 1540 1541 1542 1543
	    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
1544
    if (sf_malloc_cur_memory)				// Using SAFEMALLOC
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1545
      sprintf(strend(buff), "  Memory in use: %ldK  Max memory used: %ldK",
1546 1547
	      (sf_malloc_cur_memory+1023L)/1024L,
	      (sf_malloc_max_memory+1023L)/1024L);
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1548 1549
#endif
#ifndef EMBEDDED_LIBRARY
1550
    VOID(my_net_write(net, buff,(uint) strlen(buff)));
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1551
    VOID(net_flush(net));
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1552
#endif
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1553 1554 1555
    break;
  }
  case COM_PING:
1556
    statistic_increment(com_other,&LOCK_status);
1557
    send_ok(thd);				// Tell client we are alive
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1558 1559
    break;
  case COM_PROCESS_INFO:
1560
    statistic_increment(com_stat[SQLCOM_SHOW_PROCESSLIST],&LOCK_status);
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1561
#ifndef NO_EMBEDDED_ACCESS_CHECKS
1562
    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
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1563
      break;
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1564
#endif
1565
    mysql_log.write(thd,command,NullS);
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    mysqld_list_processes(thd,
#ifndef NO_EMBEDDED_ACCESS_CHECKS
			  thd->master_access & PROCESS_ACL ? 
			  NullS : thd->priv_user
#else
			  NullS
#endif
			  ,0);
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1574 1575 1576
    break;
  case COM_PROCESS_KILL:
  {
1577
    statistic_increment(com_stat[SQLCOM_KILL],&LOCK_status);
1578
    ulong id=(ulong) uint4korr(packet);
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1579 1580 1581 1582
    kill_one_thread(thd,id);
    break;
  }
  case COM_DEBUG:
1583
    statistic_increment(com_other,&LOCK_status);
1584
    if (check_global_access(thd, SUPER_ACL))
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1585 1586
      break;					/* purecov: inspected */
    mysql_print_status(thd);
1587
    mysql_log.write(thd,command,NullS);
1588
    send_eof(thd);
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1589 1590 1591 1592 1593
    break;
  case COM_SLEEP:
  case COM_CONNECT:				// Impossible here
  case COM_TIME:				// Impossible from client
  case COM_DELAYED_INSERT:
1594
  case COM_END:
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1595
  default:
1596
    send_error(thd, ER_UNKNOWN_COM_ERROR);
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1597 1598
    break;
  }
1599
  if (thd->lock || thd->open_tables || thd->derived_tables)
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1600 1601 1602 1603 1604
  {
    thd->proc_info="closing tables";
    close_thread_tables(thd);			/* Free tables */
  }

1605
  if (thd->is_fatal_error)
1606
    send_error(thd,0);				// End of memory ?
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1607 1608

  time_t start_of_query=thd->start_time;
1609
  thd->end_time();				// Set start time
1610

1611
  /* If not reading from backup and if the query took too long */
1612
  if (!slow_command && !thd->user_time) // do not log 'slow_command' queries
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1613
  {
1614 1615
    thd->proc_info="logging slow query";

1616 1617
    if ((ulong) (thd->start_time - thd->time_after_lock) >
	thd->variables.long_query_time ||
1618
	((thd->lex.select_lex.options &
1619
	  (QUERY_NO_INDEX_USED | QUERY_NO_GOOD_INDEX_USED)) &&
1620
	 (specialflag & SPECIAL_LOG_QUERIES_NOT_USING_INDEXES)))
1621 1622 1623 1624
    {
      long_query_count++;
      mysql_slow_log.write(thd, thd->query, thd->query_length, start_of_query);
    }
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1625
  }
1626
  thd->proc_info="cleaning up";
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1627 1628 1629 1630 1631 1632
  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));
1633
  thd->packet.shrink(thd->variables.net_buffer_length);	// Reclaim some memory
1634
  free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
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1635 1636 1637
  DBUG_RETURN(error);
}

1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655

/*
  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
1656
  /* Remove garbage at start and end of query */
1657
  while (my_isspace(thd->charset(),packet[0]) && packet_length > 0)
1658 1659 1660 1661 1662
  {
    packet++;
    packet_length--;
  }
  char *pos=packet+packet_length;		// Point at end null
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1663
  while (packet_length > 0 &&
1664
	 (pos[-1] == ';' || my_isspace(thd->charset() ,pos[-1])))
1665 1666 1667 1668 1669 1670 1671
  {
    pos--;
    packet_length--;
  }
  /* We must allocate some extra memory for query cache */
  if (!(thd->query= (char*) thd->memdup_w_gap((gptr) (packet),
					      packet_length,
1672 1673
					      thd->db_length+ 1 +
					      QUERY_CACHE_FLAGS_SIZE)))
1674 1675 1676 1677 1678 1679 1680 1681 1682 1683
    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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1684 1685 1686 1687 1688 1689
/****************************************************************************
** mysql_execute_command
** Execute command saved in thd and current_lex->sql_command
****************************************************************************/

void
1690
mysql_execute_command(THD *thd)
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1691
{
1692
  int	res= 0;
1693
  LEX	*lex= &thd->lex;
1694
  TABLE_LIST *tables= (TABLE_LIST*) lex->select_lex.table_list.first;
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1695
  SELECT_LEX *select_lex= &lex->select_lex;
1696
  SELECT_LEX_UNIT *unit= &lex->unit;
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1697 1698
  DBUG_ENTER("mysql_execute_command");

1699 1700 1701 1702 1703 1704
  /*
    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.
  */
1705
  if (tables || &lex->select_lex != lex->all_selects_list)
1706 1707 1708 1709 1710 1711 1712
    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;

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SCRUM  
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1713
#ifdef HAVE_REPLICATION
1714 1715
  if (thd->slave_thread)
  {
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1716
    /*
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merge  
monty@hundin.mysql.fi committed
1717 1718 1719 1720
      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))
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guilhem@mysql.com committed
1721 1722 1723
    {
      /* we warn the slave SQL thread */
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
1724
      DBUG_VOID_RETURN;
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guilhem@mysql.com committed
1725
    }
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merge  
monty@hundin.mysql.fi committed
1726 1727
#ifndef TO_BE_DELETED
    /*
1728 1729 1730
      This is a workaround to deal with the shortcoming in 3.23.44-3.23.46
      masters in RELEASE_LOCK() logging. We re-write SELECT RELEASE_LOCK()
      as DO RELEASE_LOCK()
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merge  
monty@hundin.mysql.fi committed
1731
    */
1732 1733 1734
    if (lex->sql_command == SQLCOM_SELECT)
    {
      lex->sql_command = SQLCOM_DO;
1735
      lex->insert_list = &select_lex->item_list;
1736
    }
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merge  
monty@hundin.mysql.fi committed
1737
#endif
1738
  }
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1739
#endif /* !HAVE_REPLICATION */
1740
  /*
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bell@sanja.is.com.ua committed
1741 1742
    TODO: make derived tables processing 'inside' SELECT processing.
    TODO: solve problem with depended derived tables in subselects
1743
  */
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Sinisa@sinisa.nasamreza.org committed
1744
  if (lex->derived_tables)
1745
  {
1746 1747 1748
    for (SELECT_LEX *sl= lex->all_selects_list;
	 sl;
	 sl= sl->next_select_in_list())
1749
    {
1750 1751 1752
      for (TABLE_LIST *cursor= sl->get_table_list();
	   cursor;
	   cursor= cursor->next)
1753
      {
1754 1755 1756
	if (cursor->derived && (res=mysql_derived(thd, lex,
						  cursor->derived,
						  cursor)))
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peter@mysql.com committed
1757
	{
1758 1759 1760 1761
	  if (res < 0 || thd->net.report_error)
	    send_error(thd,thd->killed ? ER_SERVER_SHUTDOWN : 0);
	  DBUG_VOID_RETURN;
	}
1762 1763
      }
    }
1764
  }
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monty@mashka.mysql.fi committed
1765 1766
  if (&lex->select_lex != lex->all_selects_list &&
      lex->unit.create_total_list(thd, lex, &tables, 0))
1767
    DBUG_VOID_RETURN;
1768 1769 1770 1771 1772 1773
  
  /*
    When option readonly is set deny operations which change tables.
    Except for the replication thread and the 'super' users.
  */
  if (opt_readonly &&
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1774 1775 1776 1777 1778
      !(thd->slave_thread
#ifndef NO_EMBEDDED_ACCESS_CHECKS
	|| (thd->master_access & SUPER_ACL)
#endif
	) &&
1779 1780
      (uc_update_queries[lex->sql_command] > 0))
  {
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monty@mashka.mysql.fi committed
1781
    send_error(thd, ER_CANT_UPDATE_WITH_READLOCK);
1782 1783
    DBUG_VOID_RETURN;
  }
1784

1785
  statistic_increment(com_stat[lex->sql_command],&LOCK_status);
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1786 1787 1788
  switch (lex->sql_command) {
  case SQLCOM_SELECT:
  {
1789
    select_result *result=lex->result;
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1790
#ifndef NO_EMBEDDED_ACCESS_CHECKS
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1791 1792 1793 1794 1795
    if (tables)
    {
      res=check_table_access(thd,
			     lex->exchange ? SELECT_ACL | FILE_ACL :
			     SELECT_ACL,
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1796
			     tables,0);
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1797 1798 1799
    }
    else
      res=check_access(thd, lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL,
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1800
		       any_db,0,0,0);
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1801 1802 1803 1804 1805
    if (res)
    {
      res=0;
      break;					// Error message is given
    }
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1806
#endif
1807 1808 1809 1810
    /* 
       In case of single SELECT unit->global_parameters points on first SELECT
       TODO: move counters to SELECT_LEX
    */
1811 1812 1813
    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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1814
    if (unit->select_limit_cnt <
1815
	(ha_rows) unit->global_parameters->select_limit)
1816
      unit->select_limit_cnt= HA_POS_ERROR;		// no limit
1817
    if (unit->select_limit_cnt == HA_POS_ERROR && !select_lex->next_select())
1818
      select_lex->options&= ~OPTION_FOUND_ROWS;
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1819 1820

    if (!(res=open_and_lock_tables(thd,tables)))
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1821
    {
1822
      if (lex->describe)
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1823
      {
1824 1825 1826 1827 1828 1829 1830
	if (!(result= new select_send()))
	{
	  send_error(thd, ER_OUT_OF_RESOURCES);
	  DBUG_VOID_RETURN;
	}
	else
	  thd->send_explain_fields(result);
1831
	fix_tables_pointers(lex->all_selects_list);
1832
	res= mysql_explain_union(thd, &thd->lex.unit, result);
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1833 1834
	MYSQL_LOCK *save_lock= thd->lock;
	thd->lock= (MYSQL_LOCK *)0;
1835
	result->send_eof();
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1836 1837 1838 1839
	thd->lock= save_lock;
      }
      else
      {
1840 1841
	if (!result)
	{
1842
	  if (!(result=new select_send()))
1843 1844 1845 1846 1847 1848 1849 1850 1851
	  {
	    res= -1;
#ifdef DELETE_ITEMS
	    delete select_lex->having;
	    delete select_lex->where;
#endif
	    break;
	  }
	}
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1852 1853 1854
	query_cache_store_query(thd, tables);
	res=handle_select(thd, lex, result);
      }
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1855
    }
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    break;
  }
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1858

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1859
  case SQLCOM_DO:
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1860
    if (tables && ((res= check_table_access(thd, SELECT_ACL, tables,0)) ||
1861 1862 1863 1864 1865 1866 1867
		   (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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1868 1869
    break;

1870
  case SQLCOM_EMPTY_QUERY:
1871
    send_ok(thd);
1872 1873
    break;

1874 1875 1876 1877
  case SQLCOM_HELP:
    res= mysqld_help(thd,lex->help_arg);
    break;

1878
#ifndef EMBEDDED_LIBRARY
1879
  case SQLCOM_PURGE:
1880
  {
1881
    if (check_global_access(thd, SUPER_ACL))
1882
      goto error;
1883
    // PURGE MASTER LOGS TO 'file'
1884 1885 1886
    res = purge_master_logs(thd, lex->to_log);
    break;
  }
1887 1888 1889 1890 1891 1892 1893 1894
  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;
  }
1895
#endif
1896 1897
  case SQLCOM_SHOW_WARNS:
  {
1898 1899
    res= mysqld_show_warnings(thd, (ulong)
			      ((1L << (uint) MYSQL_ERROR::WARN_LEVEL_NOTE) |
1900 1901 1902
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_WARN) |
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR)
			       ));
1903 1904 1905 1906
    break;
  }
  case SQLCOM_SHOW_ERRORS:
  {
1907 1908
    res= mysqld_show_warnings(thd, (ulong)
			      (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR));
1909 1910
    break;
  }
1911 1912
  case SQLCOM_SHOW_NEW_MASTER:
  {
1913
    if (check_global_access(thd, REPL_SLAVE_ACL))
1914
      goto error;
1915
    /* This query don't work now. See comment in repl_failsafe.cc */
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1916
#ifndef WORKING_NEW_MASTER
1917
    net_printf(thd, ER_NOT_SUPPORTED_YET, "SHOW NEW MASTER");
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1918 1919
    res= 1;
#else
1920
    res = show_new_master(thd);
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1921
#endif
1922 1923
    break;
  }
1924

1925
#ifdef HAVE_REPLICATION
1926 1927
  case SQLCOM_SHOW_SLAVE_HOSTS:
  {
1928
    if (check_global_access(thd, REPL_SLAVE_ACL))
1929 1930 1931 1932
      goto error;
    res = show_slave_hosts(thd);
    break;
  }
1933 1934
  case SQLCOM_SHOW_BINLOG_EVENTS:
  {
1935
    if (check_global_access(thd, REPL_SLAVE_ACL))
1936 1937 1938 1939
      goto error;
    res = show_binlog_events(thd);
    break;
  }
1940 1941
#endif

1942
  case SQLCOM_BACKUP_TABLE:
1943 1944
  {
    if (check_db_used(thd,tables) ||
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1945
	check_table_access(thd,SELECT_ACL, tables,0) ||
1946
	check_global_access(thd, FILE_ACL))
1947 1948
      goto error; /* purecov: inspected */
    res = mysql_backup_table(thd, tables);
1949

1950 1951
    break;
  }
1952
  case SQLCOM_RESTORE_TABLE:
1953 1954
  {
    if (check_db_used(thd,tables) ||
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1955
	check_table_access(thd, INSERT_ACL, tables,0) ||
1956
	check_global_access(thd, FILE_ACL))
1957 1958 1959 1960
      goto error; /* purecov: inspected */
    res = mysql_restore_table(thd, tables);
    break;
  }
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1961 1962 1963
  case SQLCOM_PRELOAD_KEYS:
  {
    if (check_db_used(thd, tables) ||
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1964
	check_access(thd, INDEX_ACL, tables->db, &tables->grant.privilege,0,0))
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1965 1966 1967 1968
      goto error; 
    res = mysql_preload_keys(thd, tables);
    break;
  }
1969
#ifdef HAVE_REPLICATION
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1970
  case SQLCOM_CHANGE_MASTER:
1971
  {
1972
    if (check_global_access(thd, SUPER_ACL))
1973
      goto error;
1974 1975 1976
    LOCK_ACTIVE_MI;
    res = change_master(thd,active_mi);
    UNLOCK_ACTIVE_MI;
1977 1978
    break;
  }
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1979
  case SQLCOM_SHOW_SLAVE_STAT:
1980
  {
1981 1982
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
1983
      goto error;
1984 1985 1986
    LOCK_ACTIVE_MI;
    res = show_master_info(thd,active_mi);
    UNLOCK_ACTIVE_MI;
1987 1988
    break;
  }
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1989
  case SQLCOM_SHOW_MASTER_STAT:
1990
  {
1991 1992
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
1993 1994 1995 1996
      goto error;
    res = show_binlog_info(thd);
    break;
  }
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1997

1998
  case SQLCOM_LOAD_MASTER_DATA: // sync with master
1999
    if (check_global_access(thd, SUPER_ACL))
2000
      goto error;
2001 2002 2003 2004
    if (end_active_trans(thd))
      res= -1;
    else
      res = load_master_data(thd);
2005
    break;
2006
#endif /* HAVE_REPLICATION */
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2007 2008 2009
#ifdef HAVE_INNOBASE_DB
  case SQLCOM_SHOW_INNODB_STATUS:
    {
2010
      if (check_global_access(thd, SUPER_ACL))
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2011 2012 2013 2014 2015
	goto error;
      res = innodb_show_status(thd);
      break;
    }
#endif
2016
#ifdef HAVE_REPLICATION
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2017
  case SQLCOM_LOAD_MASTER_TABLE:
2018
  {
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2019 2020
    if (!tables->db)
      tables->db=thd->db;
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2021 2022
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,CREATE_ACL,tables->db,&tables->grant.privilege,0,0))
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bk@work.mysql.com committed
2023 2024 2025 2026 2027 2028 2029 2030 2031
      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)
2032
	goto error;
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2033
    }
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2034
#endif
2035
    if (strlen(tables->real_name) > NAME_LEN)
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2036
    {
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2037
      net_printf(thd,ER_WRONG_TABLE_NAME,tables->real_name);
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2038 2039
      break;
    }
2040
    LOCK_ACTIVE_MI;
2041 2042 2043 2044
    /*
      fetch_master_table will send the error to the client on failure.
      Give error if the table already exists.
    */
2045
    if (!fetch_master_table(thd, tables->db, tables->real_name,
2046
			    active_mi, 0, 0))
2047
    {
2048
      send_ok(thd);
2049 2050
    }
    UNLOCK_ACTIVE_MI;
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2051
    break;
2052
  }
2053
#endif /* HAVE_REPLICATION */
2054

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2055
  case SQLCOM_CREATE_TABLE:
2056
  {
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2057
#ifndef NO_EMBEDDED_ACCESS_CHECKS
2058 2059
    ulong want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
		      CREATE_TMP_ACL : CREATE_ACL);
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2060
#endif
2061 2062
    if (!tables->db)
      tables->db=thd->db;
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hf@deer.(none) committed
2063 2064
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,want_priv,tables->db,&tables->grant.privilege,0,0) ||
2065 2066 2067
	check_merge_table_access(thd, tables->db,
				 (TABLE_LIST *)
				 lex->create_info.merge_list.first))
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2068
      goto error;				/* purecov: inspected */
2069
    if (grant_option && want_priv != CREATE_TMP_ACL)
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2070 2071 2072 2073
    {
      /* Check that the first table has CREATE privilege */
      TABLE_LIST *tmp_table_list=tables->next;
      tables->next=0;
2074
      bool error=check_grant(thd, want_priv, tables);
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2075 2076 2077 2078
      tables->next=tmp_table_list;
      if (error)
	goto error;
    }
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2079
#endif
2080
    if (strlen(tables->real_name) > NAME_LEN)
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2081
    {
monty@mashka.mysql.fi's avatar
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2082
      net_printf(thd, ER_WRONG_TABLE_NAME, tables->alias);
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2083 2084 2085
      res=0;
      break;
    }
2086 2087 2088
#ifndef HAVE_READLINK
    lex->create_info.data_file_name=lex->create_info.index_file_name=0;
#else
2089
    /* Fix names if symlinked tables */
2090
    if (append_file_to_dir(thd, &lex->create_info.data_file_name,
2091
			   tables->real_name) ||
2092
	append_file_to_dir(thd,&lex->create_info.index_file_name,
2093
			   tables->real_name))
2094 2095 2096 2097
    {
      res=-1;
      break;
    }
2098
#endif
2099
    if (select_lex->item_list.elements)		// With select
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2100 2101 2102 2103
    {
      select_result *result;

      if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
2104
	  find_real_table_in_list(tables->next, tables->db, tables->real_name))
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bk@work.mysql.com committed
2105
      {
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2106
	net_printf(thd,ER_UPDATE_TABLE_USED,tables->real_name);
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2107 2108
	DBUG_VOID_RETURN;
      }
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2109
#ifndef NO_EMBEDDED_ACCESS_CHECKS
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2110 2111
      if (tables->next)
      {
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2112
	if (check_table_access(thd, SELECT_ACL, tables->next,0))
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2113 2114
	  goto error;				// Error message is given
      }
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2115
#endif
2116
      select_lex->options|= SELECT_NO_UNLOCK;
2117 2118 2119 2120 2121
      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
2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137

      /* 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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2138 2139
    else // regular create
    {
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2140 2141 2142 2143
      if (lex->name)
        res= mysql_create_like_table(thd, tables, &lex->create_info, 
                                     (Table_ident *)lex->name); 
      else
2144
      {
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venu@myvenu.com committed
2145 2146 2147 2148
        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
2149
      }
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2150
      if (!res)
2151
	send_ok(thd);
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bk@work.mysql.com committed
2152 2153
    }
    break;
2154
  }
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2155 2156 2157
  case SQLCOM_CREATE_INDEX:
    if (!tables->db)
      tables->db=thd->db;
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hf@deer.(none) committed
2158 2159
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,INDEX_ACL,tables->db,&tables->grant.privilege,0,0))
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2160 2161 2162
      goto error; /* purecov: inspected */
    if (grant_option && check_grant(thd,INDEX_ACL,tables))
      goto error;
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2163
#endif
2164 2165 2166 2167
    if (end_active_trans(thd))
      res= -1;
    else
      res = mysql_create_index(thd, tables, lex->key_list);
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2168 2169
    break;

2170
#ifdef HAVE_REPLICATION
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2171
  case SQLCOM_SLAVE_START:
2172 2173 2174 2175
  {
    LOCK_ACTIVE_MI;
    start_slave(thd,active_mi,1 /* net report*/);
    UNLOCK_ACTIVE_MI;
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2176
    break;
2177
  }
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2178
  case SQLCOM_SLAVE_STOP:
2179 2180 2181 2182 2183 2184
  /*
    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,
2185
      so it waits for the client thread because t is locked by it.
2186
    - then the client thread does SLAVE STOP.
2187 2188
      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.
2189 2190 2191 2192 2193
    To prevent that, refuse SLAVE STOP if the
    client thread has locked tables
  */
  if (thd->locked_tables || thd->active_transaction())
  {
2194
    send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
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2195
    break;
2196
  }
2197 2198 2199 2200
  {
    LOCK_ACTIVE_MI;
    stop_slave(thd,active_mi,1/* net report*/);
    UNLOCK_ACTIVE_MI;
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2201
    break;
2202
  }
2203
#endif /* HAVE_REPLICATION */
2204

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2205 2206
  case SQLCOM_ALTER_TABLE:
#if defined(DONT_ALLOW_SHOW_COMMANDS)
2207
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
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2208 2209 2210
    break;
#else
    {
2211
      ulong priv=0;
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2212
      if (lex->name && (!lex->name[0] || strlen(lex->name) > NAME_LEN))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2213
      {
2214
	net_printf(thd,ER_WRONG_TABLE_NAME,lex->name);
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2215 2216 2217
	res=0;
	break;
      }
2218 2219
      if (!tables->db)
	tables->db=thd->db;
2220 2221
      if (!select_lex->db)
	select_lex->db=tables->db;
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2222 2223
      if (check_access(thd,ALTER_ACL,tables->db,&tables->grant.privilege,0,0) ||
	  check_access(thd,INSERT_ACL | CREATE_ACL,select_lex->db,&priv,0,0)||
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2224
	  check_merge_table_access(thd, tables->db,
2225 2226 2227
				   (TABLE_LIST *)
				   lex->create_info.merge_list.first))
	goto error;				/* purecov: inspected */
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2228 2229
      if (!tables->db)
	tables->db=thd->db;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2230
#ifndef NO_EMBEDDED_ACCESS_CHECKS
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2231 2232 2233 2234 2235 2236 2237 2238 2239
      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;
2240
	  tmp_table.db=select_lex->db;
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2241 2242 2243 2244 2245
	  tmp_table.grant.privilege=priv;
	  if (check_grant(thd,INSERT_ACL | CREATE_ACL,tables))
	    goto error;
	}
      }
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2246
#endif
2247 2248
      /* 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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2249
      /* ALTER TABLE ends previous transaction */
2250
      if (end_active_trans(thd))
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2251 2252
	res= -1;
      else
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2253
      {
2254
	res= mysql_alter_table(thd, select_lex->db, lex->name,
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2255 2256 2257
			       &lex->create_info,
			       tables, lex->create_list,
			       lex->key_list, lex->drop_list, lex->alter_list,
2258
			       select_lex->order_list.elements,
2259
                               (ORDER *) select_lex->order_list.first,
2260
			       lex->drop_primary, lex->duplicates,
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2261 2262 2263
			       lex->alter_keys_onoff,
                               lex->tablespace_op,
			       lex->simple_alter);
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2264
      }
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2265 2266
      break;
    }
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2267
#endif /*DONT_ALLOW_SHOW_COMMANDS*/
2268
  case SQLCOM_RENAME_TABLE:
2269 2270 2271
  {
    TABLE_LIST *table;
    if (check_db_used(thd,tables))
2272
      goto error;
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2273
#ifndef NO_EMBEDDED_ACCESS_CHECKS
2274 2275
    for (table=tables ; table ; table=table->next->next)
    {
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2276
      if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
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2277
		       &table->grant.privilege,0,0) ||
2278
	  check_access(thd, INSERT_ACL | CREATE_ACL, table->next->db,
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2279
		       &table->next->grant.privilege,0,0))
2280 2281 2282
	goto error;
      if (grant_option)
      {
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2283 2284 2285 2286 2287
	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) ||
2288
	    (!test_all_bits(table->next->grant.privilege,
2289
			    INSERT_ACL | CREATE_ACL) &&
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2290
	     check_grant(thd,INSERT_ACL | CREATE_ACL, &new_list)))
2291 2292 2293
	  goto error;
      }
    }
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2294
#endif
2295
    query_cache_invalidate3(thd, tables, 0);
2296 2297 2298
    if (end_active_trans(thd))
      res= -1;
    else if (mysql_rename_tables(thd,tables))
2299 2300
      res= -1;
    break;
2301
  }
2302
#ifndef EMBEDDED_LIBRARY
2303 2304
  case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2305
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
2306 2307 2308
    DBUG_VOID_RETURN;
#else
    {
2309
      if (check_global_access(thd, SUPER_ACL))
2310 2311 2312 2313
	goto error;
      res = show_binlogs(thd);
      break;
    }
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2314
#endif
2315
#endif /* EMBEDDED_LIBRARY */
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2316
  case SQLCOM_SHOW_CREATE:
2317
#ifdef DONT_ALLOW_SHOW_COMMANDS
2318
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
2319 2320
    DBUG_VOID_RETURN;
#else
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2321
    {
2322 2323
      if (check_db_used(thd, tables) ||
	  check_access(thd, SELECT_ACL | EXTRA_ACL, tables->db,
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2324
		       &tables->grant.privilege,0,0))
2325
	goto error;
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2326
      res = mysqld_show_create(thd, tables);
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2327 2328
      break;
    }
2329
#endif
2330 2331 2332
  case SQLCOM_CHECKSUM:
  {
    if (check_db_used(thd,tables) ||
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hf@deer.(none) committed
2333
	check_table_access(thd, SELECT_ACL | EXTRA_ACL , tables,0))
2334
      goto error; /* purecov: inspected */
2335
    res = mysql_checksum_table(thd, tables, &lex->check_opt);
2336 2337
    break;
  }
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2338
  case SQLCOM_REPAIR:
2339 2340
  {
    if (check_db_used(thd,tables) ||
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2341
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables,0))
2342 2343
      goto error; /* purecov: inspected */
    res = mysql_repair_table(thd, tables, &lex->check_opt);
2344 2345 2346 2347 2348 2349 2350 2351 2352 2353
    /* ! 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);
      }
    }
2354 2355
    break;
  }
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2356
  case SQLCOM_CHECK:
2357 2358
  {
    if (check_db_used(thd,tables) ||
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hf@deer.(none) committed
2359
 	check_table_access(thd, SELECT_ACL | EXTRA_ACL , tables,0))
2360 2361 2362 2363
      goto error; /* purecov: inspected */
    res = mysql_check_table(thd, tables, &lex->check_opt);
    break;
  }
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2364 2365
  case SQLCOM_ANALYZE:
  {
2366
    if (check_db_used(thd,tables) ||
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2367
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables,0))
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2368
      goto error; /* purecov: inspected */
2369
    res = mysql_analyze_table(thd, tables, &lex->check_opt);
2370 2371 2372 2373 2374 2375 2376 2377 2378 2379
    /* ! 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);
      }
    }
2380
    break;
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2381
  }
2382

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2383 2384 2385
  case SQLCOM_OPTIMIZE:
  {
    HA_CREATE_INFO create_info;
2386
    if (check_db_used(thd,tables) ||
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2387
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables,0))
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2388
      goto error; /* purecov: inspected */
2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399
    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;
2400
      create_info.table_charset=default_charset_info;
2401 2402 2403
      res= mysql_alter_table(thd, NullS, NullS, &create_info,
			     tables, lex->create_list,
			     lex->key_list, lex->drop_list, lex->alter_list,
2404 2405
                             0, (ORDER *) 0,
			     0, DUP_ERROR);
2406 2407 2408
    }
    else
      res = mysql_optimize_table(thd, tables, &lex->check_opt);
2409 2410 2411 2412 2413 2414 2415 2416 2417 2418
    /* ! 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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2419 2420 2421
    break;
  }
  case SQLCOM_UPDATE:
2422
    if (check_db_used(thd,tables))
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2423
      goto error;
2424

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2425
    if (single_table_command_access(thd, UPDATE_ACL, tables, &res))
2426
	goto error;
2427
    if (select_lex->item_list.elements != lex->value_list.elements)
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bk@work.mysql.com committed
2428
    {
2429
      send_error(thd,ER_WRONG_VALUE_COUNT);
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bk@work.mysql.com committed
2430 2431
      DBUG_VOID_RETURN;
    }
2432 2433 2434 2435
    res= mysql_update(thd,tables,
                      select_lex->item_list,
                      lex->value_list,
                      select_lex->where,
2436
		      select_lex->order_list.elements,
2437 2438 2439
                      (ORDER *) select_lex->order_list.first,
                      select_lex->select_limit,
                      lex->duplicates);
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2440 2441
    if (thd->net.report_error)
      res= -1;
2442 2443
    break;
  case SQLCOM_UPDATE_MULTI:
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hf@deer.(none) committed
2444 2445
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,UPDATE_ACL,tables->db,&tables->grant.privilege,0,0))
2446 2447 2448
      goto error;
    if (grant_option && check_grant(thd,UPDATE_ACL,tables))
      goto error;
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hf@deer.(none) committed
2449
#endif
2450
    if (select_lex->item_list.elements != lex->value_list.elements)
2451
    {
2452 2453
      send_error(thd,ER_WRONG_VALUE_COUNT);
      DBUG_VOID_RETURN;
2454 2455
    }
    {
2456
      const char *msg= 0;
2457
      if (select_lex->order_list.elements)
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2458
	msg= "ORDER BY";
2459 2460
      else if (select_lex->select_limit && select_lex->select_limit !=
	       HA_POS_ERROR)
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2461
	msg= "LIMIT";
2462
      if (msg)
2463
      {
2464
	net_printf(thd, ER_WRONG_USAGE, "UPDATE", msg);
2465 2466
	res= 1;
	break;
2467
      }
2468 2469 2470 2471 2472
      res= mysql_multi_update(thd,tables,
			      &select_lex->item_list,
			      &lex->value_list,
			      select_lex->where,
			      select_lex->options,
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2473
			      lex->duplicates, unit, select_lex);
2474
    }
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2475 2476
    break;
  case SQLCOM_REPLACE:
2477 2478
  case SQLCOM_INSERT:
  {
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hf@deer.(none) committed
2479
#ifndef NO_EMBEDDED_ACCESS_CHECKS
2480
    my_bool update=(lex->value_list.elements ? UPDATE_ACL : 0);
2481
    ulong privilege= (lex->duplicates == DUP_REPLACE ?
2482
                      INSERT_ACL | DELETE_ACL : INSERT_ACL | update);
2483

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bell@sanja.is.com.ua committed
2484
    if (single_table_command_access(thd, privilege, tables, &res))
2485
	goto error;
hf@deer.(none)'s avatar
SCRUM  
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2486 2487
#else
    my_bool update=(lex->value_list.elements ? 1 : 0);
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hf@deer.(none) committed
2488
#endif
2489 2490 2491 2492 2493
    if (select_lex->item_list.elements != lex->value_list.elements)
    {
      send_error(thd,ER_WRONG_VALUE_COUNT);
      DBUG_VOID_RETURN;
    }
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2494
    res = mysql_insert(thd,tables,lex->field_list,lex->many_values,
2495
                       select_lex->item_list, lex->value_list,
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SCRUM  
hf@deer.(none) committed
2496
                       (update ? DUP_UPDATE : lex->duplicates));
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2497 2498
    if (thd->net.report_error)
      res= -1;
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2499
    break;
2500
  }
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2501 2502 2503
  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
  {
2504

2505 2506 2507 2508
    /*
      Check that we have modify privileges for the first table and
      select privileges for the rest
    */
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hf@deer.(none) committed
2509
#ifndef NO_EMBEDDED_ACCESS_CHECKS
2510
    {
2511 2512
      ulong privilege= (lex->duplicates == DUP_REPLACE ?
                        INSERT_ACL | DELETE_ACL : INSERT_ACL);
2513 2514 2515
      TABLE_LIST *save_next=tables->next;
      tables->next=0;
      if (check_access(thd, privilege,
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hf@deer.(none) committed
2516
		       tables->db,&tables->grant.privilege,0,0) ||
2517 2518
	  (grant_option && check_grant(thd, privilege, tables)))
	goto error;
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hf@deer.(none) committed
2519

2520
      tables->next=save_next;
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hf@deer.(none) committed
2521
      if ((res=check_table_access(thd, SELECT_ACL, save_next,0)))
2522 2523
	goto error;
    }
hf@deer.(none)'s avatar
hf@deer.(none) committed
2524
#endif
2525 2526
    /* Don't unlock tables until command is written to binary log */
    select_lex->options|= SELECT_NO_UNLOCK;
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2527 2528

    select_result *result;
2529 2530 2531 2532
    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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bk@work.mysql.com committed
2533

2534
    if (find_real_table_in_list(tables->next, tables->db, tables->real_name))
2535
    {
2536 2537
      /* Using same table for INSERT and SELECT */
      select_lex->options |= OPTION_BUFFER_RESULT;
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2538
    }
2539 2540 2541 2542

    /* 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);
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monty@mashka.mysql.fi committed
2543 2544
    lex->select_lex.resolve_mode= SELECT_LEX::NOMATTER_MODE;

2545 2546 2547
    if (!(res=open_and_lock_tables(thd, tables)))
    {
      if ((result=new select_insert(tables->table,&lex->field_list,
2548
				    lex->duplicates)))
2549
	res=handle_select(thd,lex,result);
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bell@sanja.is.com.ua committed
2550 2551
      if (thd->net.report_error)
	res= -1;
2552 2553 2554
    }
    else
      res= -1;
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bk@work.mysql.com committed
2555 2556
    break;
  }
2557
  case SQLCOM_TRUNCATE:
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hf@deer.(none) committed
2558 2559
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,DELETE_ACL,tables->db,&tables->grant.privilege,0,0))
2560
      goto error; /* purecov: inspected */
2561 2562
    if (grant_option && check_grant(thd,DELETE_ACL,tables))
      goto error;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2563
#endif
2564 2565 2566 2567 2568 2569
    /*
      Don't allow this within a transaction because we want to use
      re-generate table
    */
    if (thd->locked_tables || thd->active_transaction())
    {
2570
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION,NullS);
2571 2572 2573 2574
      goto error;
    }
    res=mysql_truncate(thd,tables);
    break;
2575
  case SQLCOM_DELETE:
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bk@work.mysql.com committed
2576
  {
hf@deer.(none)'s avatar
hf@deer.(none) committed
2577
#ifndef NO_EMBEDDED_ACCESS_CHECKS
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bell@sanja.is.com.ua committed
2578 2579
    if (single_table_command_access(thd, DELETE_ACL, tables, &res))
      goto error;
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bk@work.mysql.com committed
2580 2581
    // Set privilege for the WHERE clause
    tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
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hf@deer.(none) committed
2582
#endif
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2583 2584
    res = mysql_delete(thd,tables, select_lex->where,
                       (ORDER*) select_lex->order_list.first,
2585
                       select_lex->select_limit, select_lex->options);
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bell@sanja.is.com.ua committed
2586 2587
    if (thd->net.report_error)
      res= -1;
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bk@work.mysql.com committed
2588 2589
    break;
  }
2590
  case SQLCOM_DELETE_MULTI:
2591 2592 2593 2594 2595
  {
    TABLE_LIST *aux_tables=(TABLE_LIST *)thd->lex.auxilliary_table_list.first;
    TABLE_LIST *auxi;
    uint table_count=0;
    multi_delete *result;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2596

2597 2598
    /* sql_yacc guarantees that tables and aux_tables are not zero */
    if (check_db_used(thd, tables) || check_db_used(thd,aux_tables) ||
hf@deer.(none)'s avatar
hf@deer.(none) committed
2599 2600
	check_table_access(thd,SELECT_ACL, tables,0) ||
	check_table_access(thd,DELETE_ACL, aux_tables,0))
2601 2602
      goto error;
    if ((thd->options & OPTION_SAFE_UPDATES) && !select_lex->where)
2603
    {
2604
      send_error(thd,ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE);
2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619
      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)
      {
2620
	net_printf(thd,ER_NONUNIQ_TABLE,auxi->real_name);
2621 2622
	goto error;
      }
2623
      walk->lock_type= auxi->lock_type;
2624
      auxi->table_list=  walk;		// Remember corresponding table
2625
    }
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2626
    if (add_item_to_list(thd, new Item_null()))
2627
    {
2628
      res= -1;
2629
      break;
2630 2631 2632 2633 2634 2635
    }
    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)
2636
      auxi->table= auxi->table_list->table;
2637
    if (&lex->select_lex != lex->all_selects_list)
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2638
    {
2639 2640 2641 2642 2643
      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))
	{
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2644
	  my_error(ER_UPDATE_TABLE_USED, MYF(0), t->real_name);
2645 2646 2647 2648
	  res= -1;
	  break;
	}
      }
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monty@mashka.mysql.fi committed
2649
    }
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bell@sanja.is.com.ua committed
2650
    fix_tables_pointers(lex->all_selects_list);
2651 2652
    if (!thd->is_fatal_error && (result= new multi_delete(thd,aux_tables,
							  table_count)))
2653
    {
2654 2655 2656
      res= mysql_select(thd, &select_lex->ref_pointer_array,
			select_lex->get_table_list(),
			select_lex->with_wild,
2657
			select_lex->item_list,
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bell@sanja.is.com.ua committed
2658
			select_lex->where,
2659
			0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
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bell@sanja.is.com.ua committed
2660 2661
			(ORDER *)NULL,
			select_lex->options | thd->options |
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
2662
			SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK,
2663
			result, unit, select_lex, 0);
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bell@sanja.is.com.ua committed
2664 2665
      if (thd->net.report_error)
	res= -1;
2666
      delete result;
2667 2668 2669 2670 2671 2672
    }
    else
      res= -1;					// Error is not sent
    close_thread_tables(thd);
    break;
  }
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bk@work.mysql.com committed
2673
  case SQLCOM_DROP_TABLE:
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
2674
  {
2675 2676
    if (!lex->drop_temporary)
    {
hf@deer.(none)'s avatar
hf@deer.(none) committed
2677
      if (check_table_access(thd,DROP_ACL,tables,0))
2678 2679 2680 2681 2682 2683 2684
	goto error;				/* purecov: inspected */
      if (end_active_trans(thd))
      {
	res= -1;
	break;
      }
    }
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
2685
    else
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697
    {
      /*
	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;
    }
2698
    res= mysql_rm_table(thd,tables,lex->drop_if_exists, lex->drop_temporary);
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monty@tik.mysql.fi committed
2699 2700
  }
  break;
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bk@work.mysql.com committed
2701 2702 2703
  case SQLCOM_DROP_INDEX:
    if (!tables->db)
      tables->db=thd->db;
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hf@deer.(none) committed
2704 2705
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,INDEX_ACL,tables->db,&tables->grant.privilege,0,0))
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bk@work.mysql.com committed
2706 2707 2708
      goto error;				/* purecov: inspected */
    if (grant_option && check_grant(thd,INDEX_ACL,tables))
      goto error;
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hf@deer.(none) committed
2709
#endif
2710 2711 2712 2713
    if (end_active_trans(thd))
      res= -1;
    else
      res = mysql_drop_index(thd, tables, lex->drop_list);
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bk@work.mysql.com committed
2714 2715
    break;
  case SQLCOM_SHOW_DATABASES:
2716
#if defined(DONT_ALLOW_SHOW_COMMANDS)
2717
    send_error(thd,ER_NOT_ALLOWED_COMMAND);   /* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2718 2719 2720
    DBUG_VOID_RETURN;
#else
    if ((specialflag & SPECIAL_SKIP_SHOW_DB) &&
2721
	check_global_access(thd, SHOW_DB_ACL))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2722 2723 2724 2725 2726
      goto error;
    res= mysqld_show_dbs(thd, (lex->wild ? lex->wild->ptr() : NullS));
    break;
#endif
  case SQLCOM_SHOW_PROCESSLIST:
hf@deer.(none)'s avatar
hf@deer.(none) committed
2727
#ifndef NO_EMBEDDED_ACCESS_CHECKS
2728
    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
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bk@work.mysql.com committed
2729
      break;
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hf@deer.(none) committed
2730
#endif
hf@deer.(none)'s avatar
hf@deer.(none) committed
2731 2732 2733 2734 2735 2736 2737 2738
    mysqld_list_processes(thd,
#ifndef NO_EMBEDDED_ACCESS_CHECKS
			  thd->master_access & PROCESS_ACL ? NullS :
			  thd->priv_user
#else
			  NullS
#endif
			  ,lex->verbose);
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bk@work.mysql.com committed
2739
    break;
2740 2741 2742 2743 2744 2745 2746 2747 2748
  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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bk@work.mysql.com committed
2749
  case SQLCOM_SHOW_STATUS:
2750
    res= mysqld_show(thd,(lex->wild ? lex->wild->ptr() : NullS),status_vars,
2751
		     OPT_GLOBAL, &LOCK_status);
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bk@work.mysql.com committed
2752 2753 2754
    break;
  case SQLCOM_SHOW_VARIABLES:
    res= mysqld_show(thd, (lex->wild ? lex->wild->ptr() : NullS),
2755 2756
		     init_vars, lex->option_type,
		     &LOCK_global_system_variables);
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bk@work.mysql.com committed
2757
    break;
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tim@cane.mysql.fi committed
2758 2759
  case SQLCOM_SHOW_LOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2760
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
2761 2762 2763
    DBUG_VOID_RETURN;
#else
    {
hf@deer.(none)'s avatar
hf@deer.(none) committed
2764 2765
#ifndef NO_EMBEDDED_ACCESS_CHECKS
      if (grant_option && check_access(thd, FILE_ACL, any_db,0,0,0))
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
2766
	goto error;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2767
#endif
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tim@cane.mysql.fi committed
2768 2769 2770 2771
      res= mysqld_show_logs(thd);
      break;
    }
#endif
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bk@work.mysql.com committed
2772
  case SQLCOM_SHOW_TABLES:
2773
    /* FALL THROUGH */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2774
#ifdef DONT_ALLOW_SHOW_COMMANDS
2775
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2776 2777 2778
    DBUG_VOID_RETURN;
#else
    {
2779
      char *db=select_lex->db ? select_lex->db : thd->db;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2780 2781
      if (!db)
      {
2782
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2783 2784 2785
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);				// Fix escaped '_'
2786
      if (check_db_name(db))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2787
      {
2788
        net_printf(thd,ER_WRONG_DB_NAME, db);
2789
        goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2790
      }
hf@deer.(none)'s avatar
hf@deer.(none) committed
2791 2792
#ifndef NO_EMBEDDED_ACCESS_CHECKS
      if (check_access(thd,SELECT_ACL,db,&thd->col_access,0,0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2793
	goto error;				/* purecov: inspected */
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2794
      if (!thd->col_access && check_grant_db(thd,db))
2795
      {
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2796
	net_printf(thd, ER_DBACCESS_DENIED_ERROR,
2797 2798 2799 2800 2801
		   thd->priv_user,
		   thd->priv_host,
		   db);
	goto error;
      }
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hf@deer.(none) committed
2802
#endif
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2803
      /* grant is checked in mysqld_show_tables */
2804
      if (select_lex->options & SELECT_DESCRIBE)
2805
        res= mysqld_extend_show_tables(thd,db,
2806
				       (lex->wild ? lex->wild->ptr() : NullS));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2807 2808 2809 2810 2811 2812
      else
	res= mysqld_show_tables(thd,db,
				(lex->wild ? lex->wild->ptr() : NullS));
      break;
    }
#endif
2813 2814 2815
  case SQLCOM_SHOW_OPEN_TABLES:
    res= mysqld_show_open_tables(thd,(lex->wild ? lex->wild->ptr() : NullS));
    break;
2816 2817
  case SQLCOM_SHOW_CHARSETS:
    res= mysqld_show_charsets(thd,(lex->wild ? lex->wild->ptr() : NullS));
2818
    break;
2819 2820 2821
  case SQLCOM_SHOW_COLLATIONS:
    res= mysqld_show_collations(thd,(lex->wild ? lex->wild->ptr() : NullS));
    break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2822 2823
  case SQLCOM_SHOW_FIELDS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2824
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2825 2826 2827
    DBUG_VOID_RETURN;
#else
    {
2828 2829
      char *db=tables->db;
      if (!*db)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2830
      {
2831
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2832 2833 2834
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);			// Fix escaped '_'
2835
      remove_escape(tables->real_name);
hf@deer.(none)'s avatar
hf@deer.(none) committed
2836 2837
#ifndef NO_EMBEDDED_ACCESS_CHECKS
      if (check_access(thd,SELECT_ACL | EXTRA_ACL,db,&thd->col_access,0,0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2838 2839 2840 2841
	goto error;				/* purecov: inspected */
      tables->grant.privilege=thd->col_access;
      if (grant_option && check_grant(thd,SELECT_ACL,tables,2))
	goto error;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2842
#endif
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2843
      res= mysqld_show_fields(thd,tables,
monty@donna.mysql.com's avatar
monty@donna.mysql.com committed
2844 2845
			      (lex->wild ? lex->wild->ptr() : NullS),
			      lex->verbose);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2846 2847 2848 2849 2850
      break;
    }
#endif
  case SQLCOM_SHOW_KEYS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2851
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2852 2853 2854
    DBUG_VOID_RETURN;
#else
    {
2855
      char *db=tables->db;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2856 2857
      if (!db)
      {
2858
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2859 2860 2861
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);			// Fix escaped '_'
2862
      remove_escape(tables->real_name);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2863 2864
      if (!tables->db)
	tables->db=thd->db;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2865 2866
#ifndef NO_EMBEDDED_ACCESS_CHECKS
      if (check_access(thd,SELECT_ACL,db,&thd->col_access,0,0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2867 2868 2869 2870
	goto error; /* purecov: inspected */
      tables->grant.privilege=thd->col_access;
      if (grant_option && check_grant(thd,SELECT_ACL,tables,2))
	goto error;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2871
#endif
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2872 2873 2874 2875 2876
      res= mysqld_show_keys(thd,tables);
      break;
    }
#endif
  case SQLCOM_CHANGE_DB:
2877
    mysql_change_db(thd,select_lex->db);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2878
    break;
2879

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2880 2881
  case SQLCOM_LOAD:
  {
hf@deer.(none)'s avatar
hf@deer.(none) committed
2882
#ifndef NO_EMBEDDED_ACCESS_CHECKS
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2883
    uint privilege= (lex->duplicates == DUP_REPLACE ?
2884
		     INSERT_ACL | DELETE_ACL : INSERT_ACL);
2885 2886

    if (!lex->local_file)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2887
    {
hf@deer.(none)'s avatar
hf@deer.(none) committed
2888
      if (check_access(thd,privilege | FILE_ACL,tables->db,0,0,0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2889 2890 2891 2892
	goto error;
    }
    else
    {
2893
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
2894
	  ! opt_local_infile)
2895
      {
2896
	send_error(thd,ER_NOT_ALLOWED_COMMAND);
2897 2898
	goto error;
      }
hf@deer.(none)'s avatar
hf@deer.(none) committed
2899
      if (check_access(thd,privilege,tables->db,&tables->grant.privilege,0,0) ||
2900
	  grant_option && check_grant(thd,privilege,tables))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2901 2902
	goto error;
    }
hf@deer.(none)'s avatar
hf@deer.(none) committed
2903
#endif /*NO_EMBEDDED_ACCESS_CHECKS*/
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2904 2905 2906 2907
    res=mysql_load(thd, lex->exchange, tables, lex->field_list,
		   lex->duplicates, (bool) lex->local_file, lex->lock_option);
    break;
  }
2908

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2909
  case SQLCOM_SET_OPTION:
hf@deer.(none)'s avatar
hf@deer.(none) committed
2910
    if (tables && ((res= check_table_access(thd, SELECT_ACL, tables,0)) ||
2911 2912 2913 2914
		   (res= open_and_lock_tables(thd,tables))))
      break;
    fix_tables_pointers(lex->all_selects_list);
    if (!(res= sql_set_variables(thd, &lex->var_list)))
2915
      send_ok(thd);
2916 2917
    if (thd->net.report_error)
      res= -1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2918
    break;
2919

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2920
  case SQLCOM_UNLOCK_TABLES:
2921
    unlock_locked_tables(thd);
2922 2923
    if (thd->options & OPTION_TABLE_LOCK)
    {
2924
      end_active_trans(thd);
2925
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2926 2927
    }
    if (thd->global_read_lock)
2928
      unlock_global_read_lock(thd);
2929
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2930 2931
    break;
  case SQLCOM_LOCK_TABLES:
2932
    unlock_locked_tables(thd);
2933
    if (check_db_used(thd,tables) || end_active_trans(thd))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2934
      goto error;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2935
    if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, tables,0))
2936
      goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2937
    thd->in_lock_tables=1;
2938
    thd->options|= OPTION_TABLE_LOCK;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2939 2940 2941 2942
    if (!(res=open_and_lock_tables(thd,tables)))
    {
      thd->locked_tables=thd->lock;
      thd->lock=0;
2943
      send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2944
    }
2945 2946
    else
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2947 2948 2949
    thd->in_lock_tables=0;
    break;
  case SQLCOM_CREATE_DB:
2950
  {
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2951
    if (!strip_sp(lex->name) || check_db_name(lex->name))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2952
    {
2953
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2954 2955
      break;
    }
2956 2957 2958 2959 2960 2961 2962
    /*
      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.
    */
2963
#ifdef HAVE_REPLICATION
2964 2965 2966
    if (thd->slave_thread && 
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
2967 2968
    {
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
2969
      break;
guilhem@mysql.com's avatar
guilhem@mysql.com committed
2970
    }
2971
#endif
hf@deer.(none)'s avatar
hf@deer.(none) committed
2972
    if (check_access(thd,CREATE_ACL,lex->name,0,1,0))
2973
      break;
2974
    res=mysql_create_db(thd,lex->name,&lex->create_info,0);
2975 2976
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2977
  case SQLCOM_DROP_DB:
2978
  {
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2979
    if (!strip_sp(lex->name) || check_db_name(lex->name))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2980
    {
2981
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2982 2983
      break;
    }
2984 2985 2986 2987 2988 2989 2990
    /*
      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.
    */
2991
#ifdef HAVE_REPLICATION
2992 2993 2994
    if (thd->slave_thread && 
	(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
	 !db_ok_with_wild_table(lex->name)))
guilhem@mysql.com's avatar
guilhem@mysql.com committed
2995 2996
    {
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
2997
      break;
guilhem@mysql.com's avatar
guilhem@mysql.com committed
2998
    }
2999
#endif
hf@deer.(none)'s avatar
hf@deer.(none) committed
3000
    if (check_access(thd,DROP_ACL,lex->name,0,1,0))
3001
      break;
3002 3003
    if (thd->locked_tables || thd->active_transaction())
    {
3004
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
3005 3006
      goto error;
    }
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3007
    res=mysql_rm_db(thd,lex->name,lex->drop_if_exists,0);
3008 3009
    break;
  }
3010 3011 3012 3013
  case SQLCOM_ALTER_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
3014
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
3015 3016
      break;
    }
hf@deer.(none)'s avatar
hf@deer.(none) committed
3017
    if (check_access(thd,ALTER_ACL,lex->name,0,1,0))
3018 3019 3020
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
3021
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
3022 3023
      goto error;
    }
3024
    res=mysql_alter_db(thd,lex->name,&lex->create_info);
3025 3026
    break;
  }
3027 3028 3029 3030
  case SQLCOM_SHOW_CREATE_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
3031
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
3032 3033
      break;
    }
hf@deer.(none)'s avatar
hf@deer.(none) committed
3034
    if (check_access(thd,DROP_ACL,lex->name,0,1,0))
3035 3036 3037
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
3038
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
3039 3040
      goto error;
    }
3041
    res=mysqld_show_create_db(thd,lex->name,&lex->create_info);
3042 3043
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3044
  case SQLCOM_CREATE_FUNCTION:
hf@deer.(none)'s avatar
hf@deer.(none) committed
3045
    if (check_access(thd,INSERT_ACL,"mysql",0,1,0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3046 3047 3048
      break;
#ifdef HAVE_DLOPEN
    if (!(res = mysql_create_function(thd,&lex->udf)))
3049
      send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3050 3051 3052 3053 3054
#else
    res= -1;
#endif
    break;
  case SQLCOM_DROP_FUNCTION:
hf@deer.(none)'s avatar
hf@deer.(none) committed
3055
    if (check_access(thd,DELETE_ACL,"mysql",0,1,0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3056 3057
      break;
#ifdef HAVE_DLOPEN
3058
    if (!(res = mysql_drop_function(thd,&lex->udf.name)))
3059
      send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3060 3061 3062 3063
#else
    res= -1;
#endif
    break;
hf@deer.(none)'s avatar
hf@deer.(none) committed
3064
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3065 3066
  case SQLCOM_DROP_USER:
  {
hf@deer.(none)'s avatar
hf@deer.(none) committed
3067
    if (check_access(thd, GRANT_ACL,"mysql",0,1,0))
3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081 3082
      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:
  {
hf@deer.(none)'s avatar
hf@deer.(none) committed
3083
    if (check_access(thd, GRANT_ACL ,"mysql",0,1,0))
3084 3085 3086 3087 3088 3089 3090 3091 3092 3093 3094 3095 3096
      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;
  }
3097 3098 3099 3100 3101 3102
  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,
hf@deer.(none)'s avatar
hf@deer.(none) committed
3103
		     tables ? 0 : 1,0))
3104 3105
      goto error;

3106 3107 3108 3109
    /*
      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
    */
3110 3111 3112 3113 3114 3115 3116 3117 3118 3119

    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 &&
3120
	     my_strcasecmp(&my_charset_latin1,
3121
                           user->host.str, thd->host_or_ip)))
3122
	{
hf@deer.(none)'s avatar
hf@deer.(none) committed
3123
	  if (check_access(thd, UPDATE_ACL, "mysql",0,1,0))
3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135
	    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;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3136 3137 3138
      if (!(res = mysql_table_grant(thd,tables,lex->users_list, lex->columns,
				    lex->grant,
				    lex->sql_command == SQLCOM_REVOKE)))
3139
      {
3140
	mysql_update_log.write(thd, thd->query, thd->query_length);
3141 3142
	if (mysql_bin_log.is_open())
	{
3143
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
3144 3145 3146 3147 3148 3149 3150 3151
	  mysql_bin_log.write(&qinfo);
	}
      }
    }
    else
    {
      if (lex->columns.elements)
      {
3152
	send_error(thd,ER_ILLEGAL_GRANT_FOR_TABLE);
3153 3154 3155 3156 3157 3158 3159
	res=1;
      }
      else
	res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
			  lex->sql_command == SQLCOM_REVOKE);
      if (!res)
      {
3160
	mysql_update_log.write(thd, thd->query, thd->query_length);
3161 3162
	if (mysql_bin_log.is_open())
	{
3163
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
3164 3165
	  mysql_bin_log.write(&qinfo);
	}
3166
	if (mqh_used && lex->sql_command == SQLCOM_GRANT)
3167
	{
3168 3169 3170
	  List_iterator <LEX_USER> str_list(lex->users_list);
	  LEX_USER *user;
	  while ((user=str_list++))
3171
	    reset_mqh(thd,user);
3172
	}
3173 3174 3175 3176
      }
    }
    break;
  }
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
3177
#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/
monty@donna.mysql.com's avatar
monty@donna.mysql.com committed
3178
  case SQLCOM_RESET:
3179 3180 3181 3182 3183 3184 3185
    /* 
       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:
  {
3186
    if (check_global_access(thd,RELOAD_ACL) || check_db_used(thd, tables))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3187
      goto error;
3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211
    /*
      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);
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3212
    break;
3213
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3214 3215 3216
  case SQLCOM_KILL:
    kill_one_thread(thd,lex->thread_id);
    break;
hf@deer.(none)'s avatar
hf@deer.(none) committed
3217
#ifndef NO_EMBEDDED_ACCESS_CHECKS
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3218 3219
  case SQLCOM_SHOW_GRANTS:
    res=0;
3220 3221
    if ((thd->priv_user &&
	 !strcmp(thd->priv_user,lex->grant_user->user.str)) ||
hf@deer.(none)'s avatar
hf@deer.(none) committed
3222
	!check_access(thd, SELECT_ACL, "mysql",0,1,0))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3223 3224 3225 3226
    {
      res = mysql_show_grants(thd,lex->grant_user);
    }
    break;
hf@deer.(none)'s avatar
hf@deer.(none) committed
3227
#endif
3228
  case SQLCOM_HA_OPEN:
3229
    if (check_db_used(thd,tables) ||
hf@deer.(none)'s avatar
hf@deer.(none) committed
3230
	check_table_access(thd,SELECT_ACL, tables,0))
3231 3232 3233 3234 3235 3236 3237 3238 3239
      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:
3240 3241 3242 3243 3244
    /*
      There is no need to check for table permissions here, because
      if a user has no permissions to read a table, he won't be
      able to open it (with SQLCOM_HA_OPEN) in the first place.
    */
serg@serg.mylan's avatar
serg@serg.mylan committed
3245
    if (check_db_used(thd,tables))
3246
      goto error;
serg@serg.mysql.com's avatar
serg@serg.mysql.com committed
3247
    res = mysql_ha_read(thd, tables, lex->ha_read_mode, lex->backup_dir,
3248 3249
			lex->insert_list, lex->ha_rkey_mode, select_lex->where,
			select_lex->select_limit, select_lex->offset_limit);
3250 3251
    break;

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3252
  case SQLCOM_BEGIN:
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
3253 3254 3255 3256 3257 3258
    if (thd->locked_tables)
    {
      thd->lock=thd->locked_tables;
      thd->locked_tables=0;			// Will be automaticly closed
      close_thread_tables(thd);			// Free tables
    }
3259 3260 3261 3262 3263 3264
    if (end_active_trans(thd))
    {
      res= -1;
    }
    else
    {
3265
      thd->options= ((thd->options & (ulong) ~(OPTION_STATUS_NO_TRANS_UPDATE)) |
3266 3267
		     OPTION_BEGIN);
      thd->server_status|= SERVER_STATUS_IN_TRANS;
3268
      send_ok(thd);
3269
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3270 3271
    break;
  case SQLCOM_COMMIT:
3272 3273 3274 3275 3276
    /*
      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
3277
  {
3278
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3279 3280
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    if (!ha_commit(thd))
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3281
    {
3282
      send_ok(thd);
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3283
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3284 3285 3286
    else
      res= -1;
    break;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3287
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3288 3289 3290
  case SQLCOM_ROLLBACK:
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    if (!ha_rollback(thd))
3291
    {
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3292 3293 3294 3295 3296 3297 3298 3299 3300 3301
      /*
        If a non-transactional table was updated, warn; don't warn if this is a
        slave thread (because when a slave thread executes a ROLLBACK, it has
        been read from the binary log, so it's 100% sure and normal to produce
        error ER_WARNING_NOT_COMPLETE_ROLLBACK. If we sent the warning to the
        slave SQL thread, it would not stop the thread but just be printed in
        the error log; but we don't want users to wonder why they have this
        message in the error log, so we don't send it.
      */
      if ((thd->options & OPTION_STATUS_NO_TRANS_UPDATE) && !thd->slave_thread)
3302
	send_warning(thd,ER_WARNING_NOT_COMPLETE_ROLLBACK,0);
3303
      else
3304
	send_ok(thd);
3305
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3306 3307
    else
      res= -1;
3308
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3309
    break;
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3310 3311 3312
  case SQLCOM_ROLLBACK_TO_SAVEPOINT:
    if (!ha_rollback_to_savepoint(thd, lex->savepoint_name))
    {
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3313
      if ((thd->options & OPTION_STATUS_NO_TRANS_UPDATE) && !thd->slave_thread)
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
3314
	send_warning(thd, ER_WARNING_NOT_COMPLETE_ROLLBACK, 0);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3315
      else
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
3316
	send_ok(thd);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3317 3318 3319 3320
    }
    else
      res= -1;
    break;
3321
  case SQLCOM_SAVEPOINT:
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3322
    if (!ha_savepoint(thd, lex->savepoint_name))
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
3323
      send_ok(thd);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3324 3325
    else
      res= -1;
3326
    break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3327
  default:					/* Impossible */
3328
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3329 3330 3331 3332
    break;
  }
  thd->proc_info="query end";			// QQ
  if (res < 0)
3333
    send_error(thd,thd->killed ? ER_SERVER_SHUTDOWN : 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3334 3335 3336 3337 3338 3339

error:
  DBUG_VOID_RETURN;
}


hf@deer.(none)'s avatar
hf@deer.(none) committed
3340
#ifndef NO_EMBEDDED_ACCESS_CHECKS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3341 3342 3343 3344
/*
  Check grants for commands which work only with one table and all other
  tables belong to subselects.

3345
  SYNOPSIS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356
    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
*/

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3357
static bool single_table_command_access(THD *thd, ulong privilege,
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3358 3359 3360
					TABLE_LIST *tables, int *res)
					 
{
hf@deer.(none)'s avatar
hf@deer.(none) committed
3361
    if (check_access(thd, privilege, tables->db, &tables->grant.privilege,0,0))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3362 3363 3364 3365 3366 3367 3368 3369 3370
      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)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3371 3372 3373
    if (subselects_tables)
    {
      tables->next= subselects_tables;
hf@deer.(none)'s avatar
hf@deer.(none) committed
3374
      if ((*res= check_table_access(thd, SELECT_ACL, subselects_tables,0)))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3375 3376
	return 1;
    }
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3377 3378 3379 3380
    return 0;
}


bk@work.mysql.com's avatar
bk@work.mysql.com committed
3381
/****************************************************************************
3382
  Get the user (global) and database privileges for all used tables
3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395

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

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

    save_priv	In this we store global and db level grants for the table
		Note that we don't store db level grants if the global grants
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
3396 3397
                is enough to satisfy the request and the global grants contains
                a SELECT grant.
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3398 3399 3400
****************************************************************************/

bool
3401
check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
3402
	     bool dont_check_global_grants, bool no_errors)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3403
{
3404 3405 3406 3407
  DBUG_ENTER("check_access");
  DBUG_PRINT("enter",("want_access: %lu  master_access: %lu", want_access,
		      thd->master_access));
  ulong db_access,dummy;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3408 3409 3410 3411 3412
  if (save_priv)
    *save_priv=0;
  else
    save_priv= &dummy;

3413
  if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3414
  {
3415
    if (!no_errors)
3416
      send_error(thd,ER_NO_DB_ERROR);	/* purecov: tested */
3417
    DBUG_RETURN(TRUE);				/* purecov: tested */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3418 3419 3420 3421
  }

  if ((thd->master_access & want_access) == want_access)
  {
3422 3423 3424 3425 3426 3427 3428 3429
    /*
      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))))
3430
      db_access=acl_get(thd->host, thd->ip,
3431
			thd->priv_user, db, test(want_access & GRANT_ACL));
3432
    *save_priv=thd->master_access | db_access;
3433
    DBUG_RETURN(FALSE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3434
  }
3435
  if (((want_access & ~thd->master_access) & ~(DB_ACLS | EXTRA_ACL)) ||
3436
      ! db && dont_check_global_grants)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3437
  {						// We can never grant this
3438
    if (!no_errors)
3439
      net_printf(thd,ER_ACCESS_DENIED_ERROR,
3440
		 thd->priv_user,
3441
		 thd->priv_host,
3442
		 thd->password ? ER(ER_YES) : ER(ER_NO));/* purecov: tested */
3443
    DBUG_RETURN(TRUE);				/* purecov: tested */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3444 3445 3446
  }

  if (db == any_db)
3447
    DBUG_RETURN(FALSE);				// Allow select on anything
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3448

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3449
  if (db && (!thd->db || strcmp(db,thd->db)))
3450
    db_access=acl_get(thd->host, thd->ip,
3451
		      thd->priv_user, db, test(want_access & GRANT_ACL));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3452 3453
  else
    db_access=thd->db_access;
3454 3455
  // Remove SHOW attribute and access rights we already have
  want_access &= ~(thd->master_access | EXTRA_ACL);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3456
  db_access= ((*save_priv=(db_access | thd->master_access)) & want_access);
3457 3458

  /* grant_option is set if there exists a single table or column grant */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3459
  if (db_access == want_access ||
3460
      ((grant_option && !dont_check_global_grants) &&
3461
       !(want_access & ~(db_access | TABLE_ACLS))))
3462
    DBUG_RETURN(FALSE);				/* Ok */
3463
  if (!no_errors)
3464
    net_printf(thd,ER_DBACCESS_DENIED_ERROR,
3465
	       thd->priv_user,
3466
	       thd->priv_host,
3467
	       db ? db : thd->db ? thd->db : "unknown"); /* purecov: tested */
3468
  DBUG_RETURN(TRUE);				/* purecov: tested */
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3469 3470 3471
}


3472 3473 3474 3475 3476 3477 3478 3479 3480 3481 3482 3483 3484 3485 3486 3487 3488 3489
/*
  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
*/
3490 3491

bool check_global_access(THD *thd, ulong want_access)
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3492
{
3493
  char command[128];
3494
  if ((thd->master_access & want_access))
3495 3496
    return 0;
  get_privilege_desc(command, sizeof(command), want_access);
3497
  net_printf(thd,ER_SPECIFIC_ACCESS_DENIED_ERROR,
3498 3499
	     command);
  return 1;
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3500 3501 3502
}


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3503
/*
3504 3505
  Check the privilege for all used tables.  Table privileges are cached
  in the table list for GRANT checking
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3506 3507
*/

3508
bool
3509
check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables,
3510
		   bool no_errors)
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3511
{
3512 3513
  uint found=0;
  ulong found_access=0;
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3514 3515 3516
  TABLE_LIST *org_tables=tables;
  for (; tables ; tables=tables->next)
  {
3517
    if (tables->derived || (tables->table && (int)tables->table->tmp_table))
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3518
      continue;
3519 3520
    if ((thd->master_access & want_access) == (want_access & ~EXTRA_ACL) &&
	thd->db)
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3521
      tables->grant.privilege= want_access;
3522
    else if (tables->db && tables->db == thd->db)
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3523 3524 3525 3526 3527
    {
      if (found && !grant_option)		// db already checked
	tables->grant.privilege=found_access;
      else
      {
3528 3529
	if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
			 0, no_errors))
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3530 3531
	  return TRUE;				// Access denied
	found_access=tables->grant.privilege;
3532
	found=1;
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3533 3534
      }
    }
3535
    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
3536
			  0, no_errors))
3537
      return TRUE;
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3538 3539
  }
  if (grant_option)
3540
    return check_grant(thd,want_access & ~EXTRA_ACL,org_tables,
3541
		       test(want_access & EXTRA_ACL), no_errors);
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3542 3543 3544
  return FALSE;
}

3545 3546
static bool check_merge_table_access(THD *thd, char *db,
				     TABLE_LIST *table_list)
3547 3548 3549 3550
{
  int error=0;
  if (table_list)
  {
3551
    /* Check that all tables use the current database */
3552 3553
    TABLE_LIST *tmp;
    for (tmp=table_list; tmp ; tmp=tmp->next)
3554 3555 3556 3557
    {
      if (!tmp->db || !tmp->db[0])
	tmp->db=db;
    }
3558
    error=check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
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3559
			     table_list,0);
3560 3561 3562 3563
  }
  return error;
}

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#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/

static bool check_db_used(THD *thd,TABLE_LIST *tables)
{
  for (; tables ; tables=tables->next)
  {
    if (!tables->db)
    {
      if (!(tables->db=thd->db))
      {
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: tested */
	return TRUE;				/* purecov: tested */
      }
    }
  }
  return FALSE;
}
3581

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3582 3583 3584 3585 3586 3587 3588 3589 3590 3591
/****************************************************************************
	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

3592
#ifndef EMBEDDED_LIBRARY
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3593 3594 3595 3596 3597 3598 3599 3600
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));
3601
    thd->fatal_error();
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3602 3603 3604 3605
    return 1;
  }
  return 0;
}
3606
#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;
}


/****************************************************************************
3641
  Initialize global thd variables needed for query
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3642 3643
****************************************************************************/

3644
void
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3645 3646 3647
mysql_init_query(THD *thd)
{
  DBUG_ENTER("mysql_init_query");
3648 3649 3650
  LEX *lex=&thd->lex;
  lex->unit.init_query();
  lex->unit.init_select();
3651
  lex->unit.thd= thd;
3652 3653 3654
  lex->select_lex.init_query();
  lex->value_list.empty();
  lex->param_list.empty();
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3655 3656
  lex->unit.next= lex->unit.master= 
    lex->unit.link_next= lex->unit.return_to=0;
3657
  lex->unit.prev= lex->unit.link_prev= 0;
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3658
  lex->unit.slave= lex->unit.global_parameters= lex->current_select=
3659
    lex->all_selects_list= &lex->select_lex;
3660 3661
  lex->select_lex.master= &lex->unit;
  lex->select_lex.prev= &lex->unit.slave;
3662
  lex->select_lex.link_next= lex->select_lex.slave= lex->select_lex.next= 0;
3663
  lex->select_lex.link_prev= (st_select_lex_node**)&(lex->all_selects_list);
3664 3665
  lex->describe= 0;
  lex->derived_tables= FALSE;
3666 3667
  lex->lock_option= TL_READ;
  lex->found_colon= 0;
3668
  lex->safe_to_cache_query= 1;
3669
  thd->select_number= lex->select_lex.select_number= 1;
3670
  thd->free_list= 0;
3671
  thd->total_warn_count=0;			// Warnings for this query
3672 3673
  thd->last_insert_id_used= thd->query_start_used= thd->insert_id_used=0;
  thd->sent_row_count= thd->examined_row_count= 0;
3674
  thd->is_fatal_error= thd->rand_used= 0;
3675
  thd->server_status &= ~SERVER_MORE_RESULTS_EXISTS;
3676
  thd->tmp_table_used= 0;
3677 3678
  if (opt_bin_log)
    reset_dynamic(&thd->user_var_events);
3679
  thd->clear_error();
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3680 3681 3682
  DBUG_VOID_RETURN;
}

3683

3684 3685 3686
void
mysql_init_select(LEX *lex)
{
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3687
  SELECT_LEX *select_lex= lex->current_select;
3688
  select_lex->init_select();
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3689
  select_lex->select_limit= lex->thd->variables.select_limit;
3690 3691 3692 3693 3694 3695
  if (select_lex == &lex->select_lex)
  {
    lex->exchange= 0;
    lex->result= 0;
    lex->proc_list.first= 0;
  }
3696 3697
}

3698

3699
bool
3700
mysql_new_select(LEX *lex, bool move_down)
3701
{
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3702
  SELECT_LEX *select_lex = new(&lex->thd->mem_root) SELECT_LEX();
3703 3704
  if (!select_lex)
    return 1;
3705
  select_lex->select_number= ++lex->thd->select_number;
3706 3707 3708 3709 3710
  select_lex->init_query();
  select_lex->init_select();
  if (move_down)
  {
    /* first select_lex of subselect or derived table */
3711
    SELECT_LEX_UNIT *unit= new(&lex->thd->mem_root) SELECT_LEX_UNIT();
3712 3713 3714 3715
    if (!unit)
      return 1;
    unit->init_query();
    unit->init_select();
3716
    unit->thd= lex->thd;
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3717
    unit->include_down(lex->current_select);
3718 3719
    unit->link_next= 0;
    unit->link_prev= 0;
3720
    unit->return_to= lex->current_select;
3721 3722 3723
    select_lex->include_down(unit);
  }
  else
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3724
  {
3725
    select_lex->include_neighbour(lex->current_select);
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3726 3727 3728 3729 3730 3731 3732 3733
    SELECT_LEX_UNIT *unit= select_lex->master_unit();
    SELECT_LEX *fake= unit->fake_select_lex;
    if (!fake)
    {
      /*
	as far as we included SELECT_LEX for UNION unit should have
	fake SELECT_LEX for UNION processing
      */
3734
      fake= unit->fake_select_lex= new(&lex->thd->mem_root) SELECT_LEX();
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3735 3736 3737 3738 3739 3740
      fake->include_standalone(unit,
			       (SELECT_LEX_NODE**)&unit->fake_select_lex);
      fake->select_number= INT_MAX;
      fake->make_empty_select();
      fake->linkage= GLOBAL_OPTIONS_TYPE;
      fake->select_limit= lex->thd->variables.select_limit;
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3741
      fake->resolve_mode= SELECT_LEX::SELECT_MODE;
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3742 3743
    }
  }
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3744

3745
  select_lex->master_unit()->global_parameters= select_lex;
3746
  select_lex->include_global((st_select_lex_node**)&lex->all_selects_list);
3747
  lex->current_select= select_lex;
3748
  select_lex->resolve_mode= SELECT_LEX::SELECT_MODE;
3749
  return 0;
3750
}
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3751

3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766
/*
  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)
{
3767
  THD *thd;
3768
  LEX *lex;
3769
  LEX_STRING tmp, null_lex_string;
3770
  DBUG_ENTER("create_select_for_variable");
3771 3772 3773

  thd= current_thd;
  lex= &thd->lex;
3774 3775 3776 3777
  mysql_init_select(lex);
  lex->sql_command= SQLCOM_SELECT;
  tmp.str= (char*) var_name;
  tmp.length=strlen(var_name);
3778 3779 3780
  bzero((char*) &null_lex_string.str, sizeof(null_lex_string));
  add_item_to_list(thd, get_system_var(thd, OPT_SESSION, tmp,
				       null_lex_string));
3781 3782 3783
  DBUG_VOID_RETURN;
}

3784

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3785 3786
void mysql_init_multi_delete(LEX *lex)
{
3787
  lex->sql_command=  SQLCOM_DELETE_MULTI;
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3788
  mysql_init_select(lex);
3789
  lex->select_lex.select_limit= lex->unit.select_limit_cnt=
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3790
    HA_POS_ERROR;
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3791
  lex->select_lex.table_list.save_and_clear(&lex->auxilliary_table_list);
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3792
}
3793

3794

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3795
void
3796
mysql_parse(THD *thd, char *inBuf, uint length)
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3797 3798 3799 3800
{
  DBUG_ENTER("mysql_parse");

  mysql_init_query(thd);
3801
  if (query_cache_send_result_to_client(thd, inBuf, length) <= 0)
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3802 3803
  {
    LEX *lex=lex_start(thd, (uchar*) inBuf, length);
3804
    if (!yyparse((void *)thd) && ! thd->is_fatal_error)
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3805
    {
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3806
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3807
      if (mqh_used && thd->user_connect &&
3808
	  check_mqh(thd, lex->sql_command))
3809 3810 3811 3812
      {
	thd->net.error = 0;
      }
      else
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3813
#endif
3814
      {
3815 3816 3817 3818 3819
	if (thd->net.report_error)
	  send_error(thd, 0, NullS);
	else
	{
	  mysql_execute_command(thd);
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SCRUM  
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3820
#ifndef EMBEDDED_LIBRARY  /* TODO query cache in embedded library*/
3821
	  query_cache_end_of_result(&thd->net);
3822
#endif
3823
	}
3824
      }
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3825 3826
    }
    else
3827 3828
    {
      DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
3829
			 thd->is_fatal_error));
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SCRUM  
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3830
#ifndef EMBEDDED_LIBRARY   /* TODO query cache in embedded library*/
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3831
      query_cache_abort(&thd->net);
3832
#endif
3833
    }
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3834
    thd->proc_info="freeing items";
3835
    free_items(thd->free_list);  /* Free strings used by items */
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3836 3837
    lex_end(lex);
  }
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  DBUG_VOID_RETURN;
}


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

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3847
bool add_field_to_list(THD *thd, char *field_name, enum_field_types type,
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		       char *length, char *decimals,
3849
		       uint type_modifier,
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3850
		       Item *default_value, LEX_STRING *comment,
3851 3852
		       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;
3857
  char warn_buff[MYSQL_ERRMSG_SIZE];
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  DBUG_ENTER("add_field_to_list");

  if (strlen(field_name) > NAME_LEN)
  {
3862
    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));
3868
    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));
3875
    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();
  }

3880
  if (default_value)
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3881
  {
3882
    if (default_value->type() == Item::NULL_ITEM)
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3883
    {
3884 3885 3886 3887
      default_value=0;
      if ((type_modifier & (NOT_NULL_FLAG | AUTO_INCREMENT_FLAG)) ==
	  NOT_NULL_FLAG)
      {
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3888
	net_printf(thd,ER_INVALID_DEFAULT,field_name);
3889 3890 3891 3892 3893
	DBUG_RETURN(1);
      }
    }
    else if (type_modifier & AUTO_INCREMENT_FLAG)
    {
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3894
      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;
3902
  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;
3913
  new_field->charset=cs;
3914
  new_field->geom_type= (Field::geometry_type) uint_geom_type;
3915

3916 3917 3918 3919 3920 3921 3922 3923
  if (!comment)
  {
    new_field->comment.str=0;
    new_field->comment.length=0;
  }
  else
  {
    /* In this case comment is always of type Item_string */
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    new_field->comment.str=   (char*) comment->str;
    new_field->comment.length=comment->length;
3926
  }
3927 3928
  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:
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    if (new_field->length <= MAX_FIELD_CHARLENGTH || default_value)
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      break;
    /* Convert long CHAR() and VARCHAR columns to TEXT or BLOB */
    new_field->sql_type= FIELD_TYPE_BLOB;
    sprintf(warn_buff, ER(ER_AUTO_CONVERT), field_name, "CHAR",
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	    (cs == &my_charset_bin) ? "BLOB" : "TEXT");
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    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_AUTO_CONVERT,
		 warn_buff);
    /* fall through */
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  case FIELD_TYPE_BLOB:
  case FIELD_TYPE_TINY_BLOB:
  case FIELD_TYPE_LONG_BLOB:
  case FIELD_TYPE_MEDIUM_BLOB:
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  case FIELD_TYPE_GEOMETRY:
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    if (new_field->length)
    {
      /* The user has given a length to the blob column */
      if (new_field->length < 256)
	type= FIELD_TYPE_TINY_BLOB;
      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;
4098

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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;
    }
  }

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

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

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

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

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


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

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

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


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bool add_to_list(THD *thd, SQL_LIST &list,Item *item,bool asc)
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{
  ORDER *order;
  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) ||
4277
      table->db.str && check_db_name(table->db.str))
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  {
4279
    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);
    }
4290
    if (!(alias_str=thd->memdup(alias_str,table->table.length+1)))
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      DBUG_RETURN(0);
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  }
4293
  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;
4316
  ptr->real_name_length=table->table.length;
4317
  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
*/

4361
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)
{
4381
  if (expr)
4382
  {
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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();
4391
  }
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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;
}

4418
/*
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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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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  if (options & REFRESH_GRANT)
  {
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    acl_reload(thd);
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    grant_reload(thd);
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    if (mqh_used)
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      reset_mqh(thd,(LEX_USER *) NULL,true);
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  }
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#endif
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  if (options & REFRESH_LOG)
  {
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    /*
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      Flush the normal query log, the update log, the binary log,
      the slow query log, and the relay log (if it exists).
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    */
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    /* 
     Writing this command to the binlog may result in infinite loops when doing
     mysqlbinlog|mysql, and anyway it does not really make sense to log it
     automatically (would cause more trouble to users than it would help them)
    */
    tmp_write_to_binlog= 0;
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    mysql_log.new_file(1);
    mysql_update_log.new_file(1);
    mysql_bin_log.new_file(1);
    mysql_slow_log.new_file(1);
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#ifdef HAVE_REPLICATION
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    if (expire_logs_days)
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    {
      long purge_time= time(0) - expire_logs_days*24*60*60;
      if (purge_time >= 0)
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	mysql_bin_log.purge_logs_before_date(purge_time);
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    }
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    LOCK_ACTIVE_MI;
    rotate_relay_log(active_mi);
    UNLOCK_ACTIVE_MI;
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#endif
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    if (ha_flush_logs())
      result=1;
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    if (flush_error_log())
      result=1;
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  }
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#ifdef HAVE_QUERY_CACHE
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  if (options & REFRESH_QUERY_CACHE_FREE)
  {
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    query_cache.pack();				// FLUSH QUERY CACHE
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    options &= ~REFRESH_QUERY_CACHE; //don't flush all cache, just free memory
  }
  if (options & (REFRESH_TABLES | REFRESH_QUERY_CACHE))
  {
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    query_cache.flush();			// RESET QUERY CACHE
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  }
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#endif /*HAVE_QUERY_CACHE*/
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  /*
    Note that if REFRESH_READ_LOCK bit is set then REFRESH_TABLES is set too
    (see sql_yacc.yy)
  */
  if (options & (REFRESH_TABLES | REFRESH_READ_LOCK)) 
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  {
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    if ((options & REFRESH_READ_LOCK) && thd)
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    {
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      /*
	Writing to the binlog could cause deadlocks, as we don't log
	UNLOCK TABLES
      */
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      tmp_write_to_binlog= 0;
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      if (lock_global_read_lock(thd))
	return 1;
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    }
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    result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1, tables);
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  }
  if (options & REFRESH_HOSTS)
    hostname_cache_refresh();
  if (options & REFRESH_STATUS)
    refresh_status();
  if (options & REFRESH_THREADS)
    flush_thread_cache();
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#ifdef HAVE_REPLICATION
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  if (options & REFRESH_MASTER)
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  {
    tmp_write_to_binlog= 0;
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    if (reset_master(thd))
      result=1;
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  }
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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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#ifdef HAVE_REPLICATION
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 if (options & REFRESH_SLAVE)
 {
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   tmp_write_to_binlog= 0;
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   LOCK_ACTIVE_MI;
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   if (reset_slave(thd, active_mi))
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     result=1;
   UNLOCK_ACTIVE_MI;
 }
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#endif
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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 if (options & REFRESH_USER_RESOURCES)
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   reset_mqh(thd,(LEX_USER *) NULL);
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#endif
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 if (write_to_binlog)
   *write_to_binlog= tmp_write_to_binlog;
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 return result;
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}

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/*
  kill on thread

  SYNOPSIS
    kill_one_thread()
    thd			Thread class
    id			Thread id

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

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void kill_one_thread(THD *thd, ulong id)
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{
  THD *tmp;
  uint error=ER_NO_SUCH_THREAD;
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  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For unlink from list
  I_List_iterator<THD> it(threads);
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  while ((tmp=it++))
  {
    if (tmp->thread_id == id)
    {
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      pthread_mutex_lock(&tmp->LOCK_delete);	// Lock from delete
      break;
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    }
  }
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
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  if (tmp)
  {
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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    if ((thd->master_access & SUPER_ACL) ||
	!strcmp(thd->user,tmp->user))
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#endif
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    {
      tmp->awake(1 /*prepare to die*/);
      error=0;
    }
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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    else
      error=ER_KILL_DENIED_ERROR;
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#endif
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    pthread_mutex_unlock(&tmp->LOCK_delete);
  }

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

/* Clear most status variables */

static void refresh_status(void)
{
  pthread_mutex_lock(&THR_LOCK_keycache);
  pthread_mutex_lock(&LOCK_status);
  for (struct show_var_st *ptr=status_vars; ptr->name; ptr++)
  {
    if (ptr->type == SHOW_LONG)
      *(ulong*) ptr->value=0;
  }
  pthread_mutex_unlock(&LOCK_status);
  pthread_mutex_unlock(&THR_LOCK_keycache);
}
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	/* If pointer is not a null pointer, append filename to it */

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static bool append_file_to_dir(THD *thd, char **filename_ptr, char *table_name)
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{
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  char buff[FN_REFLEN],*ptr, *end;
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  if (!*filename_ptr)
    return 0;					// nothing to do

  /* Check that the filename is not too long and it's a hard path */
  if (strlen(*filename_ptr)+strlen(table_name) >= FN_REFLEN-1 ||
      !test_if_hard_path(*filename_ptr))
  {
    my_error(ER_WRONG_TABLE_NAME, MYF(0), *filename_ptr);
    return 1;
  }
  /* Fix is using unix filename format on dos */
  strmov(buff,*filename_ptr);
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  end=convert_dirname(buff, *filename_ptr, NullS);
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  if (!(ptr=thd->alloc((uint) (end-buff)+(uint) strlen(table_name)+1)))
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    return 1;					// End of memory
  *filename_ptr=ptr;
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  strxmov(ptr,buff,table_name,NullS);
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  return 0;
}
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/*
  Check if the select is a simple select (not an union)

  SYNOPSIS
    check_simple_select()

  RETURN VALUES
    0	ok
    1	error	; In this case the error messege is sent to the client
*/

bool check_simple_select()
{
  THD *thd= current_thd;
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  if (thd->lex.current_select != &thd->lex.select_lex)
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  {
    char command[80];
    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;
}

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

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

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

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

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compare_func_creator comp_ne_creator(bool invert)
{
  return invert?&Item_bool_func2::eq_creator:&Item_bool_func2::ne_creator;
}
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/*
  Construct ALL/ANY/SOME subquery Item

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

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

  Item_allany_subselect *it=
    new Item_allany_subselect(left_expr, (*cmp)(all), select_lex);
  if (all)
    return it->upper_not= new Item_func_not_all(it);	/* ALL */

  return it;						/* ANY/SOME */
}