sql_parse.cc 130 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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static bool check_merge_table_access(THD *thd, char *db, TABLE_LIST *tables);
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static void remove_escape(char *name);
static void refresh_status(void);
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static bool append_file_to_dir(THD *thd, char **filename_ptr,
			       char *table_name);
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static bool single_table_command_access(THD *thd, ulong privilege,
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					TABLE_LIST *tables, int *res);

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const char *any_db="*any*";	// Special symbol for check_access
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const char *command_name[]={
  "Sleep", "Quit", "Init DB", "Query", "Field List", "Create DB",
  "Drop DB", "Refresh", "Shutdown", "Statistics", "Processlist",
  "Connect","Kill","Debug","Ping","Time","Delayed_insert","Change user",
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  "Binlog Dump","Table Dump",  "Connect Out", "Register Slave",
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  "Prepare", "Prepare Execute", "Long Data", "Close stmt",
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  "Error"					// Last command number
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};

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static char empty_c_string[1]= {0};		// Used for not defined 'db'
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#ifdef __WIN__
static void  test_signal(int sig_ptr)
{
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#if !defined( DBUG_OFF)
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  MessageBox(NULL,"Test signal","DBUG",MB_OK);
#endif
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#if defined(OS2)
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  fprintf(stderr, "Test signal %d\n", sig_ptr);
  fflush(stderr);
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#endif
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}
static void init_signals(void)
{
  int signals[7] = {SIGINT,SIGILL,SIGFPE,SIGSEGV,SIGTERM,SIGBREAK,SIGABRT } ;
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  for (int i=0 ; i < 7 ; i++)
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    signal( signals[i], test_signal) ;
}
#endif

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static void unlock_locked_tables(THD *thd)
{
  if (thd->locked_tables)
  {
    thd->lock=thd->locked_tables;
    thd->locked_tables=0;			// Will be automaticly closed
    close_thread_tables(thd);			// Free tables
  }
}

static bool end_active_trans(THD *thd)
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{
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  int error=0;
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  if (thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN |
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		      OPTION_TABLE_LOCK))
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  {
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    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
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    if (ha_commit(thd))
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      error=1;
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  }
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  return error;
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}


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static HASH hash_user_connections;

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static int get_or_create_user_conn(THD *thd, const char *user,
				   const char *host,
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				   USER_RESOURCES *mqh)
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{
  int return_val=0;
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  uint temp_len, user_len, host_len;
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  char temp_user[USERNAME_LENGTH+HOSTNAME_LENGTH+2];
  struct  user_conn *uc;

  DBUG_ASSERT(user != 0);
  DBUG_ASSERT(host != 0);

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  user_len=strlen(user);
  host_len=strlen(host);
  temp_len= (strmov(strmov(temp_user, user)+1, host) - temp_user)+1;
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  (void) pthread_mutex_lock(&LOCK_user_conn);
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  if (!(uc = (struct  user_conn *) hash_search(&hash_user_connections,
					       (byte*) temp_user, temp_len)))
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  {
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    /* First connection for user; Create a user connection object */
    if (!(uc= ((struct user_conn*)
	       my_malloc(sizeof(struct user_conn) + temp_len+1,
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			 MYF(MY_WME)))))
    {
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      send_error(thd, 0, NullS);		// Out of memory
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      return_val=1;
      goto end;
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    }
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    uc->user=(char*) (uc+1);
    memcpy(uc->user,temp_user,temp_len+1);
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    uc->user_len= user_len;
    uc->host=uc->user + uc->user_len +  1;
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    uc->len = temp_len;
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    uc->connections = 1;
    uc->questions=uc->updates=uc->conn_per_hour=0;
    uc->user_resources=*mqh;
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    if (max_user_connections && mqh->connections > max_user_connections)
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      uc->user_resources.connections = max_user_connections;
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    uc->intime=thd->thr_create_time;
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    if (my_hash_insert(&hash_user_connections, (byte*) uc))
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    {
      my_free((char*) uc,0);
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      send_error(thd, 0, NullS);		// Out of memory
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      return_val=1;
      goto end;
    }
  }
  thd->user_connect=uc;
end:
  (void) pthread_mutex_unlock(&LOCK_user_conn);
  return return_val;
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}
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#ifndef EMBEDDED_LIBRARY
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/*
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    Check if user exist and password supplied is correct. 
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  SYNOPSIS
    check_user()
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    thd          thread handle, thd->{host,user,ip} are used
    command      originator of the check: now check_user is called
                 during connect and change user procedures; used for 
                 logging.
    passwd       scrambled password recieved from client
    passwd_len   length of scrambled password
    db           database name to connect to, may be NULL
    check_count  dont know exactly

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

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

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static 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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  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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  }
  /* here res is always >= 0 */
  if (res == 0)
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  {
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    if (!(thd->master_access & NO_ACCESS)) // authentification is OK 
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    {
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      DBUG_PRINT("info",
                 ("Capabilities: %d  packet_length: %ld  Host: '%s'  "
                  "Login user: '%s' Priv_user: '%s'  Using password: %s "
                  "Access: %u  db: '%s'",
                  thd->client_capabilities, thd->max_client_packet_length,
                  thd->host_or_ip, thd->user, thd->priv_user,
                  passwd_len ? "yes": "no",
                  thd->master_access, thd->db ? thd->db : "*none*"));

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

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

      /* Don't allow user to connect if he has done too many queries */
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      if ((ur.questions || ur.updates ||
           ur.connections || max_user_connections) &&
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          get_or_create_user_conn(thd,thd->user,thd->host_or_ip,&ur))
        DBUG_RETURN(1);
      if (thd->user_connect && thd->user_connect->user_resources.connections &&
          check_for_max_user_connections(thd, thd->user_connect))
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        DBUG_RETURN(1);
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      /* Change database if necessary: OK or FAIL is sent in mysql_change_db */
      if (db && db[0])
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      {
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        if (mysql_change_db(thd, db))
        {
          if (thd->user_connect)
            decrease_user_connections(thd->user_connect);
          DBUG_RETURN(-1);
        }
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      }
      else
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        send_ok(thd);
      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 // EMBEDDED_LIBRARY


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/*
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  Check for maximum allowable user connections, if the mysqld server is
  started with corresponding variable that is greater then 0.
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*/

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extern "C" byte *get_key_conn(user_conn *buff, uint *length,
			      my_bool not_used __attribute__((unused)))
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{
  *length=buff->len;
  return (byte*) buff->user;
}

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extern "C" void free_user(struct user_conn *uc)
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{
  my_free((char*) uc,MYF(0));
}

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void init_max_user_conn(void)
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{
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  (void) hash_init(&hash_user_connections,system_charset_info,max_connections,
		   0,0,
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		   (hash_get_key) get_key_conn, (hash_free_key) free_user,
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		   0);
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}


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static int check_for_max_user_connections(THD *thd, USER_CONN *uc)
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{
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  int error=0;
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  DBUG_ENTER("check_for_max_user_connections");
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  if (max_user_connections &&
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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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  uc->connections++;
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  if (uc->user_resources.connections &&
      uc->conn_per_hour++ >= uc->user_resources.connections)
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  {
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    net_printf(thd, ER_USER_LIMIT_REACHED, uc->user,
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	       "max_connections",
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	       (long) uc->user_resources.connections);
    error=1;
  }
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end:
  DBUG_RETURN(error);
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}


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

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

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

char  uc_update_queries[SQLCOM_END];

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

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

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

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

521
  (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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  {
542
    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);
553
}
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/*
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    Perform handshake, authorize client and update thd ACL variables.
558
  SYNOPSIS
559
    check_connection()
560
    thd  thread handle
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  RETURN
563
     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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*/

568
#ifndef EMBEDDED_LIBRARY  
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static int
570
check_connection(THD *thd)
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{
572
  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
  {
580
    char ip[30];
581

582
    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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    {
      thd->host= (char*) localhost;
      thd->host_or_ip= localhost;
    }
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    else
#endif
    {
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      if (!(specialflag & SPECIAL_NO_RESOLVE))
      {
	vio_in_addr(net->vio,&thd->remote.sin_addr);
	thd->host=ip_to_hostname(&thd->remote.sin_addr,&connect_errors);
	/* Cut very long hostnames to avoid possible overflows */
	if (thd->host)
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	{
604
	  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);
  }
617
  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);
685
  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
    */
711
    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;
  }

739
  if (thd->client_capabilities & CLIENT_IGNORE_SPACE)
740
    thd->variables.sql_mode|= MODE_IGNORE_SPACE;
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#ifdef HAVE_OPENSSL
742
  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);
758
    }
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    DBUG_PRINT("info", ("Reading user information over SSL layer"));
760
    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)
778
    thd->variables.net_wait_timeout= thd->variables.net_interactive_timeout;
779
  if ((thd->client_capabilities & CLIENT_TRANSACTIONS) &&
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      opt_using_transactions)
    net->return_status= &thd->server_status;
782
  net->read_timeout=(uint) thd->variables.net_read_timeout;
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  char *user= end;
  char *passwd= strend(user)+1;
786
  char *db= passwd;
787
  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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  {
801 802 803 804
    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
                             system_charset_info,
                             db, strlen(db),
                             thd->charset())]= 0;
805
    db= db_buff;
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  }
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808 809
  if (thd->user)
    x_free(thd->user);
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  if (!(thd->user= my_strdup(user, MYF(0))))
    return (ER_OUT_OF_RESOURCES);
812
  return check_user(thd, COM_CONNECT, passwd, passwd_len, db, true);
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}

815

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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
828
  if (!(test_flags & TEST_NO_THREADS) & my_thread_init())
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  {
830
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
831
    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())
  {
857
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
858
    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;

869
    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)
875
	my_sleep(1000);				/* must wait after eof() */
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#endif
877
      statistic_increment(aborted_connects,&LOCK_status);
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      goto end_thread;
    }
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#ifdef __NETWARE__
    netware_reg_user(thd->ip, thd->user, "MySQL");
#endif
883
    if (thd->variables.max_join_size == HA_POS_ERROR)
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      thd->options |= OPTION_BIG_SELECTS;
    if (thd->client_capabilities & CLIENT_COMPRESS)
      net->compress=1;				// Use compression

888
    thd->proc_info=0;				// Remove 'login'
889
    thd->command=COM_SLEEP;
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    thd->version=refresh_version;
    thd->set_time();
892
    thd->init_for_queries();
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    while (!net->error && net->vio != 0 && !thd->killed)
    {
      if (do_command(thd))
	break;
    }
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    if (thd->user_connect)
      decrease_user_connections(thd->user_connect);
900
    free_root(&thd->mem_root,MYF(0));
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    if (net->error && net->vio != 0 && net->report_error)
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    {
903
      if (!thd->killed && thd->variables.log_warnings)
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	sql_print_error(ER(ER_NEW_ABORTING_CONNECTION),
			thd->thread_id,(thd->db ? thd->db : "unconnected"),
			thd->user ? thd->user : "unauthenticated",
			thd->host_or_ip,
			(net->last_errno ? ER(net->last_errno) :
			 ER(ER_UNKNOWN_ERROR)));
910
      send_error(thd,net->last_errno,NullS);
911
      statistic_increment(aborted_threads,&LOCK_status);
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    }
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    else if (thd->killed)
    {
      statistic_increment(aborted_threads,&LOCK_status);
    }
917
    
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end_thread:
919
    close_connection(thd, 0, 1);
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    end_thread(thd,1);
    /*
      If end_thread returns, we are either running with --one-thread
      or this thread has been schedule to handle the next query
    */
    thd= current_thd;
  } while (!(test_flags & TEST_NO_THREADS));
  /* The following is only executed if we are not using --one-thread */
  return(0);					/* purecov: deadcode */
}

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/*
  Execute commands from bootstrap_file.
  Used when creating the initial grant tables
*/
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936
extern "C" pthread_handler_decl(handle_bootstrap,arg)
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{
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  THD *thd=(THD*) arg;
  FILE *file=bootstrap_file;
  char *buff;
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941

942
  /* The following must be called before DBUG_ENTER */
943
  if (my_thread_init() || thd->store_globals())
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  {
945
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
946
    thd->fatal_error();
947
    goto end;
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  }
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  DBUG_ENTER("handle_bootstrap");

  pthread_detach_this_thread();
  thd->thread_stack= (char*) &thd;
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953
#if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__)
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  sigset_t set;
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  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
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#endif

959
  if (thd->variables.max_join_size == HA_POS_ERROR)
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    thd->options |= OPTION_BIG_SELECTS;

  thd->proc_info=0;
  thd->version=refresh_version;
964
  thd->priv_user=thd->user=(char*) my_strdup("boot", MYF(MY_WME));
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  buff= (char*) thd->net.buff;
967
  thd->init_for_queries();
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  while (fgets(buff, thd->net.max_packet, file))
  {
970
    uint length=(uint) strlen(buff);
971
    while (length && (my_isspace(thd->charset(), buff[length-1]) ||
972
           buff[length-1] == ';'))
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973 974
      length--;
    buff[length]=0;
975
    thd->query_length=length;
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    thd->query= thd->memdup_w_gap(buff, length+1, thd->db_length+1);
    thd->query[length] = '\0';
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    thd->query_id=query_id++;
979
    if (mqh_used && thd->user_connect && check_mqh(thd, SQLCOM_END))
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    {
      thd->net.error = 0;
      close_thread_tables(thd);			// Free tables
      free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
      break;
    }
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    mysql_parse(thd,thd->query,length);
    close_thread_tables(thd);			// Free tables
988
    if (thd->is_fatal_error)
989
      break;
990
    free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
991
    free_root(&thd->transaction.mem_root,MYF(MY_KEEP_PREALLOC));
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  }
993 994 995 996 997 998

  /* thd->fatal_error should be set in case something went wrong */
end:
  (void) pthread_mutex_lock(&LOCK_thread_count);
  thread_count--;
  (void) pthread_mutex_unlock(&LOCK_thread_count);
999
  (void) pthread_cond_broadcast(&COND_thread_count);
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  my_thread_end();
  pthread_exit(0);
  DBUG_RETURN(0);				// Never reached
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}

1005 1006
#endif /* EMBEDDED_LIBRARY */

1007
    /* This works because items are allocated with sql_alloc() */
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1008

1009
void free_items(Item *item)
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{
1011
  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;
1022
  if (!(table_list = (TABLE_LIST*) thd->calloc(sizeof(TABLE_LIST))))
1023
    DBUG_RETURN(1); // out of memory
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  table_list->db = db;
1025
  table_list->real_name = table_list->alias = tbl_name;
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  table_list->lock_type = TL_READ_NO_INSERT;
  table_list->next = 0;

1029 1030
  if (!db || check_db_name(db))
  {
1031
    net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
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    goto err;
  }
1034
  if (lower_case_table_names)
1035
    my_casedn_str(files_charset_info, tbl_name);
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  remove_escape(table_list->real_name);
1037 1038 1039 1040

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

1041
  if (check_access(thd, SELECT_ACL, db, &table_list->grant.privilege))
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    goto err;
1043
  if (grant_option && check_grant(thd, SELECT_ACL, table_list))
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    goto err;

  thd->free_list = 0;
1047
  thd->query_length=(uint) strlen(tbl_name);
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  thd->query = tbl_name;
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  if ((error = mysqld_dump_create_info(thd, table, -1)))
  {
1051
    my_error(ER_GET_ERRNO, MYF(0), my_errno);
1052 1053
    goto err;
  }
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  net_flush(&thd->net);
1055
  if ((error= table->file->dump(thd,fd)))
1056
    my_error(ER_GET_ERRNO, MYF(0));
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err:
  close_thread_tables(thd);
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  DBUG_RETURN(error);
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}


1064
	/* Execute one command from socket (query or simple command) */
1065 1066

#ifndef EMBEDDED_LIBRARY
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bool do_command(THD *thd)
{
  char *packet;
1070 1071
  uint old_timeout;
  ulong packet_length;
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  NET *net;
  enum enum_server_command command;
  DBUG_ENTER("do_command");

  net= &thd->net;
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  /*
    indicator of uninitialized lex => normal flow of errors handling
    (see my_message_sql)
  */
  thd->lex.current_select= 0;
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  packet=0;
1084 1085 1086
  old_timeout=net->read_timeout;
  // Wait max for 8 hours
  net->read_timeout=(uint) thd->variables.net_wait_timeout;
1087
  thd->clear_error();				// Clear error message
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  net_new_transaction(net);
  if ((packet_length=my_net_read(net)) == packet_error)
  {
1092 1093 1094 1095 1096
    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)
1097 1098
    {
      statistic_increment(aborted_threads,&LOCK_status);
1099
      DBUG_RETURN(TRUE);			// We have to close it.
1100
    }
1101
    send_error(thd,net->last_errno,NullS);
1102
    net->error= 0;
1103
    DBUG_RETURN(FALSE);
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  }
  else
  {
    packet=(char*) net->read_pos;
    command = (enum enum_server_command) (uchar) packet[0];
1109 1110
    if (command >= COM_END)
      command= COM_END;				// Wrong command
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    DBUG_PRINT("info",("Command on %s = %d (%s)",
		       vio_description(net->vio), command,
		       command_name[command]));
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1114
  }
1115
  net->read_timeout=old_timeout;		// restore it
1116
  DBUG_RETURN(dispatch_command(command,thd, packet+1, (uint) packet_length));
1117
}
1118
#endif  /* EMBEDDED_LIBRARY */
1119

1120

1121 1122 1123 1124
bool dispatch_command(enum enum_server_command command, THD *thd,
		      char* packet, uint packet_length)
{
  NET *net= &thd->net;
1125
  bool error= 0;
1126 1127 1128 1129
  /*
    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
  */
1130 1131 1132
  bool slow_command=FALSE;
  DBUG_ENTER("dispatch_command");

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  thd->command=command;
1134
  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));
1141

1142
  thd->lex.select_lex.options=0;		// We store status here
1143
  switch (command) {
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  case COM_INIT_DB:
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  {
    LEX_STRING tmp;
    statistic_increment(com_stat[SQLCOM_CHANGE_DB],&LOCK_status);
    thd->convert_string(&tmp, system_charset_info,
			packet, strlen(packet), thd->charset());
    if (!mysql_change_db(thd, tmp.str))
      mysql_log.write(thd,command,"%s",thd->db);
    break;
  }
1154
#ifdef HAVE_REPLICATION
1155 1156
  case COM_REGISTER_SLAVE:
  {
1157
    if (!register_slave(thd, (uchar*)packet, packet_length))
1158
      send_ok(thd);
1159 1160
    break;
  }
1161
#endif
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  case COM_TABLE_DUMP:
1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176
  {
    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;
  }
1177
#ifndef EMBEDDED_LIBRARY
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1178 1179
  case COM_CHANGE_USER:
  {
1180
    thd->change_user();
1181
    thd->clear_error();                         // if errors from rollback
1182

1183 1184
    statistic_increment(com_other, &LOCK_status);
    char *user= (char*) packet;
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    char *passwd= strend(user)+1;
1186 1187 1188 1189 1190
    /* 
      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).
    */
1191
    char db_buff[NAME_LEN+1];                 // buffer to store db in utf8 
1192 1193 1194 1195
    char *db= passwd;
    uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ? 
      *passwd++ : strlen(passwd);
    db+= passwd_len + 1;
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    /* Small check for incomming packet */
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1197
    if ((uint) ((uchar*) db - net->read_pos) > packet_length)
1198 1199 1200 1201
    {
      send_error(thd, ER_UNKNOWN_COM_ERROR);
      break;
    }
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1202

1203
    /* Convert database name to utf8 */
1204 1205 1206 1207
    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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1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223
    /* 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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1224

1225
    int res= check_user(thd, COM_CHANGE_USER, passwd, passwd_len, db, false);
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1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247
    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 */
      if (max_connections && save_uc)
        decrease_user_connections(save_uc);
      x_free((gptr) save_db);
      x_free((gptr) save_user);
    }
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    break;
  }
1250
#endif /* EMBEDDED_LIBRARY */
1251 1252
  case COM_EXECUTE:
  {
1253
    mysql_stmt_execute(thd, packet);
1254 1255 1256 1257
    break;
  }
  case COM_LONG_DATA:
  {
1258
    mysql_stmt_get_longdata(thd, packet, packet_length);
1259 1260 1261 1262
    break;
  }
  case COM_PREPARE:
  {
1263
    mysql_stmt_prepare(thd, packet, packet_length);
1264 1265
    break;
  }
1266 1267 1268 1269 1270
  case COM_CLOSE_STMT:
  {
    mysql_stmt_free(thd, packet);
    break;
  }
1271 1272 1273 1274 1275
  case COM_RESET_STMT:
  {
    mysql_stmt_reset(thd, packet);
    break;
  }
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  case COM_QUERY:
  {
1278 1279
    if (alloc_query(thd, packet, packet_length))
      break;					// fatal error is set
1280
    mysql_log.write(thd,command,"%s",thd->query);
1281
    DBUG_PRINT("query",("%-.4096s",thd->query));
1282
    mysql_parse(thd,thd->query, thd->query_length);
1283

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1284
    while (!thd->killed && !thd->is_fatal_error && thd->lex.found_colon)
1285
    {
1286
      char *packet= thd->lex.found_colon;
1287 1288 1289 1290 1291 1292
      /* 
        Multiple queries exits, execute them individually
      */
      if (thd->lock || thd->open_tables || thd->derived_tables)
        close_thread_tables(thd);		

1293
      ulong length= thd->query_length-(ulong)(thd->lex.found_colon-thd->query);
1294 1295
      
      /* Remove garbage at start of query */
1296
      while (my_isspace(thd->charset(), *packet) && length > 0)
1297 1298 1299 1300 1301
      {
        packet++;
        length--;
      }
      thd->query_length= length;
1302 1303 1304 1305
      thd->query= packet;
      VOID(pthread_mutex_lock(&LOCK_thread_count));
      thd->query_id= query_id++;
      VOID(pthread_mutex_unlock(&LOCK_thread_count));
1306 1307 1308
      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;
  }
1314
  case COM_FIELD_LIST:				// This isn't actually needed
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1315
#ifdef DONT_ALLOW_SHOW_COMMANDS
1316
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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    break;
#else
  {
1320
    char *fields, *pend;
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1321
    TABLE_LIST table_list;
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    LEX_STRING conv_name;

1324
    statistic_increment(com_stat[SQLCOM_SHOW_FIELDS],&LOCK_status);
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    bzero((char*) &table_list,sizeof(table_list));
    if (!(table_list.db=thd->db))
    {
1328
      send_error(thd,ER_NO_DB_ERROR);
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      break;
    }
    thd->free_list=0;
1332
    pend= strend(packet);
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    thd->convert_string(&conv_name, system_charset_info,
			packet, (uint) (pend-packet), thd->charset());
    table_list.alias= table_list.real_name= conv_name.str;
1336
    packet= pend+1;
1337
    // command not cachable => no gap for data base name
1338 1339
    if (!(thd->query=fields=thd->memdup(packet,thd->query_length+1)))
      break;
1340
    mysql_log.write(thd,command,"%s %s",table_list.real_name,fields);
1341
    if (lower_case_table_names)
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1342
      my_casedn_str(files_charset_info, table_list.real_name);
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    remove_escape(table_list.real_name);	// This can't have wildcards

    if (check_access(thd,SELECT_ACL,table_list.db,&thd->col_access))
      break;
    table_list.grant.privilege=thd->col_access;
    if (grant_option && check_grant(thd,SELECT_ACL,&table_list,2))
      break;
    mysqld_list_fields(thd,&table_list,fields);
1351
    free_items(thd->free_list);
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    break;
  }
#endif
  case COM_QUIT:
1356
    /* We don't calculate statistics for this command */
1357
    mysql_log.write(thd,command,NullS);
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    net->error=0;				// Don't give 'abort' message
    error=TRUE;					// End server
    break;

1362
  case COM_CREATE_DB:				// QQ: To be removed
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    {
1364
      statistic_increment(com_stat[SQLCOM_CREATE_DB],&LOCK_status);
1365
      char *db=thd->strdup(packet);
1366
      // null test to handle EOM
1367
      if (!db || !strip_sp(db) || check_db_name(db))
1368
      {
1369
	net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
1370 1371
	break;
      }
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      if (check_access(thd,CREATE_ACL,db,0,1))
	break;
1374
      mysql_log.write(thd,command,packet);
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      mysql_create_db(thd,db,0,0);
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      break;
    }
1378
  case COM_DROP_DB:				// QQ: To be removed
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    {
1380
      statistic_increment(com_stat[SQLCOM_DROP_DB],&LOCK_status);
1381
      char *db=thd->strdup(packet);
1382
      // null test to handle EOM
1383
      if (!db || !strip_sp(db) || check_db_name(db))
1384
      {
1385
	net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
1386 1387
	break;
      }
1388 1389
      if (check_access(thd,DROP_ACL,db,0,1))
	break;
1390 1391
      if (thd->locked_tables || thd->active_transaction())
      {
1392
	send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
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	break;
1394
      }
1395
      mysql_log.write(thd,command,db);
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      mysql_rm_db(thd,db,0,0);
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      break;
    }
1399
#ifndef EMBEDDED_LIBRARY
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  case COM_BINLOG_DUMP:
    {
1402
      statistic_increment(com_other,&LOCK_status);
1403
      slow_command = TRUE;
1404
      if (check_global_access(thd, REPL_SLAVE_ACL))
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	break;
1406
      mysql_log.write(thd,command, 0);
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1407

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      ulong pos;
      ushort flags;
1410
      uint32 slave_server_id;
1411
      /* TODO: The following has to be changed to an 8 byte integer */
1412 1413
      pos = uint4korr(packet);
      flags = uint2korr(packet + 4);
1414
      thd->server_id=0; /* avoid suicide */
1415
      if ((slave_server_id= uint4korr(packet+6))) // mysqlbinlog.server_id==0
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1416
	kill_zombie_dump_threads(slave_server_id);
1417
      thd->server_id = slave_server_id;
1418
      mysql_binlog_send(thd, thd->strdup(packet + 10), (my_off_t) pos, flags);
1419
      unregister_slave(thd,1,1);
1420 1421 1422
      // fake COM_QUIT -- if we get here, the thread needs to terminate
      error = TRUE;
      net->error = 0;
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1423 1424
      break;
    }
1425
#endif
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1426 1427
  case COM_REFRESH:
    {
1428
      statistic_increment(com_stat[SQLCOM_FLUSH],&LOCK_status);
1429
      ulong options= (ulong) (uchar) packet[0];
1430
      if (check_global_access(thd,RELOAD_ACL))
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1431
	break;
1432
      mysql_log.write(thd,command,NullS);
1433 1434 1435 1436
      if (reload_acl_and_cache(thd, options, (TABLE_LIST*) 0, NULL))
        send_error(thd, 0);
      else
        send_ok(thd);
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1437 1438
      break;
    }
1439
#ifndef EMBEDDED_LIBRARY
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1440
  case COM_SHUTDOWN:
1441
    statistic_increment(com_other,&LOCK_status);
1442
    if (check_global_access(thd,SHUTDOWN_ACL))
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1443 1444
      break; /* purecov: inspected */
    DBUG_PRINT("quit",("Got shutdown command"));
1445
    mysql_log.write(thd,command,NullS);
1446
    send_eof(thd);
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#ifdef __WIN__
    sleep(1);					// must wait after eof()
#endif
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1450
#ifndef OS2
1451
    send_eof(thd);				// This is for 'quit request'
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1452
#endif
1453
    close_connection(thd, 0, 1);
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1454
    close_thread_tables(thd);			// Free before kill
1455
    free_root(&thd->mem_root,MYF(0));
1456
    free_root(&thd->transaction.mem_root,MYF(0));
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1457 1458 1459
    kill_mysql();
    error=TRUE;
    break;
1460 1461
#endif
#ifndef EMBEDDED_LIBRARY
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1462 1463
  case COM_STATISTICS:
  {
1464
    mysql_log.write(thd,command,NullS);
1465
    statistic_increment(com_stat[SQLCOM_SHOW_STATUS],&LOCK_status);
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1466
    char buff[200];
1467
    ulong uptime = (ulong) (thd->start_time - start_time);
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1468
    sprintf((char*) buff,
1469
	    "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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1470 1471 1472 1473 1474
	    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
1475
    if (sf_malloc_cur_memory)				// Using SAFEMALLOC
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1476
      sprintf(strend(buff), "  Memory in use: %ldK  Max memory used: %ldK",
1477 1478
	      (sf_malloc_cur_memory+1023L)/1024L,
	      (sf_malloc_max_memory+1023L)/1024L);
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1479
 #endif
1480
    VOID(my_net_write(net, buff,(uint) strlen(buff)));
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1481 1482 1483
    VOID(net_flush(net));
    break;
  }
1484
#endif
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1485
  case COM_PING:
1486
    statistic_increment(com_other,&LOCK_status);
1487
    send_ok(thd);				// Tell client we are alive
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1488 1489
    break;
  case COM_PROCESS_INFO:
1490
    statistic_increment(com_stat[SQLCOM_SHOW_PROCESSLIST],&LOCK_status);
1491
    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
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1492
      break;
1493
    mysql_log.write(thd,command,NullS);
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1494 1495 1496 1497 1498
    mysqld_list_processes(thd,thd->master_access & PROCESS_ACL ? NullS :
			  thd->priv_user,0);
    break;
  case COM_PROCESS_KILL:
  {
1499
    statistic_increment(com_stat[SQLCOM_KILL],&LOCK_status);
1500
    ulong id=(ulong) uint4korr(packet);
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1501 1502 1503 1504
    kill_one_thread(thd,id);
    break;
  }
  case COM_DEBUG:
1505
    statistic_increment(com_other,&LOCK_status);
1506
    if (check_global_access(thd, SUPER_ACL))
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1507 1508
      break;					/* purecov: inspected */
    mysql_print_status(thd);
1509
    mysql_log.write(thd,command,NullS);
1510
    send_eof(thd);
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1511 1512 1513 1514 1515
    break;
  case COM_SLEEP:
  case COM_CONNECT:				// Impossible here
  case COM_TIME:				// Impossible from client
  case COM_DELAYED_INSERT:
1516
  case COM_END:
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1517
  default:
1518
    send_error(thd, ER_UNKNOWN_COM_ERROR);
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    break;
  }
1521
  if (thd->lock || thd->open_tables || thd->derived_tables)
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1522 1523 1524 1525 1526
  {
    thd->proc_info="closing tables";
    close_thread_tables(thd);			/* Free tables */
  }

1527
  if (thd->is_fatal_error)
1528
    send_error(thd,0);				// End of memory ?
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1529 1530

  time_t start_of_query=thd->start_time;
1531
  thd->end_time();				// Set start time
1532

1533
  /* If not reading from backup and if the query took too long */
1534
  if (!slow_command && !thd->user_time) // do not log 'slow_command' queries
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1535
  {
1536 1537
    thd->proc_info="logging slow query";

1538 1539
    if ((ulong) (thd->start_time - thd->time_after_lock) >
	thd->variables.long_query_time ||
1540
	((thd->lex.select_lex.options &
1541
	  (QUERY_NO_INDEX_USED | QUERY_NO_GOOD_INDEX_USED)) &&
1542
	 (specialflag & SPECIAL_LONG_LOG_FORMAT)))
1543 1544 1545 1546
    {
      long_query_count++;
      mysql_slow_log.write(thd, thd->query, thd->query_length, start_of_query);
    }
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1547
  }
1548
  thd->proc_info="cleaning up";
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1549 1550 1551 1552 1553 1554
  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));
1555
  thd->packet.shrink(thd->variables.net_buffer_length);	// Reclaim some memory
1556
  free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
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1557 1558 1559
  DBUG_RETURN(error);
}

1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577

/*
  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
1578
  /* Remove garbage at start and end of query */
1579
  while (my_isspace(thd->charset(),packet[0]) && packet_length > 0)
1580 1581 1582 1583 1584
  {
    packet++;
    packet_length--;
  }
  char *pos=packet+packet_length;		// Point at end null
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1585
  while (packet_length > 0 &&
1586
	 (pos[-1] == ';' || my_isspace(thd->charset() ,pos[-1])))
1587 1588 1589 1590 1591 1592 1593
  {
    pos--;
    packet_length--;
  }
  /* We must allocate some extra memory for query cache */
  if (!(thd->query= (char*) thd->memdup_w_gap((gptr) (packet),
					      packet_length,
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1594 1595
					      thd->db_length+2+
					      sizeof(ha_rows))))
1596 1597 1598 1599 1600 1601 1602 1603 1604 1605
    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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1606 1607 1608 1609 1610 1611
/****************************************************************************
** mysql_execute_command
** Execute command saved in thd and current_lex->sql_command
****************************************************************************/

void
1612
mysql_execute_command(THD *thd)
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1613
{
1614
  int	res= 0;
1615
  LEX	*lex= &thd->lex;
1616
  TABLE_LIST *tables= (TABLE_LIST*) lex->select_lex.table_list.first;
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1617
  SELECT_LEX *select_lex= &lex->select_lex;
1618
  SELECT_LEX_UNIT *unit= &lex->unit;
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1619 1620
  DBUG_ENTER("mysql_execute_command");

1621 1622 1623 1624 1625 1626
  /*
    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.
  */
1627
  if (tables || &lex->select_lex != lex->all_selects_list)
1628 1629 1630 1631 1632 1633 1634
    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;

1635
#ifndef EMBEDDED_LIBRARY
1636 1637
  if (thd->slave_thread)
  {
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1638
    /*
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merge  
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1639 1640 1641 1642
      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
1643 1644 1645
    {
      /* we warn the slave SQL thread */
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
1646
      DBUG_VOID_RETURN;
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1647
    }
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merge  
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1648 1649
#ifndef TO_BE_DELETED
    /*
1650 1651 1652
      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
1653
    */
1654 1655 1656
    if (lex->sql_command == SQLCOM_SELECT)
    {
      lex->sql_command = SQLCOM_DO;
1657
      lex->insert_list = &select_lex->item_list;
1658
    }
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merge  
monty@hundin.mysql.fi committed
1659
#endif
1660
  }
1661
#endif /* !EMBEDDED_LIBRARY */
1662
  /*
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1663 1664
    TODO: make derived tables processing 'inside' SELECT processing.
    TODO: solve problem with depended derived tables in subselects
1665
  */
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Sinisa@sinisa.nasamreza.org committed
1666
  if (lex->derived_tables)
1667
  {
1668 1669 1670
    for (SELECT_LEX *sl= lex->all_selects_list;
	 sl;
	 sl= sl->next_select_in_list())
1671
    {
1672 1673 1674
      for (TABLE_LIST *cursor= sl->get_table_list();
	   cursor;
	   cursor= cursor->next)
1675
      {
1676 1677 1678
	if (cursor->derived && (res=mysql_derived(thd, lex,
						  cursor->derived,
						  cursor)))
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1679
	{
1680 1681 1682 1683
	  if (res < 0 || thd->net.report_error)
	    send_error(thd,thd->killed ? ER_SERVER_SHUTDOWN : 0);
	  DBUG_VOID_RETURN;
	}
1684 1685
      }
    }
1686
  }
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1687 1688
  if (&lex->select_lex != lex->all_selects_list &&
      lex->unit.create_total_list(thd, lex, &tables, 0))
1689
    DBUG_VOID_RETURN;
1690 1691 1692 1693 1694 1695 1696 1697 1698
  
  /*
    When option readonly is set deny operations which change tables.
    Except for the replication thread and the 'super' users.
  */
  if (opt_readonly &&
      !(thd->slave_thread || (thd->master_access & SUPER_ACL)) &&
      (uc_update_queries[lex->sql_command] > 0))
  {
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1699
    send_error(thd, ER_CANT_UPDATE_WITH_READLOCK);
1700 1701
    DBUG_VOID_RETURN;
  }
1702

1703
  statistic_increment(com_stat[lex->sql_command],&LOCK_status);
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1704 1705 1706
  switch (lex->sql_command) {
  case SQLCOM_SELECT:
  {
1707
    select_result *result=lex->result;
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1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723
    if (tables)
    {
      res=check_table_access(thd,
			     lex->exchange ? SELECT_ACL | FILE_ACL :
			     SELECT_ACL,
			     tables);
    }
    else
      res=check_access(thd, lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL,
		       any_db);
    if (res)
    {
      res=0;
      break;					// Error message is given
    }

1724 1725 1726 1727
    /* 
       In case of single SELECT unit->global_parameters points on first SELECT
       TODO: move counters to SELECT_LEX
    */
1728 1729 1730
    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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1731
    if (unit->select_limit_cnt <
1732
	(ha_rows) unit->global_parameters->select_limit)
1733
      unit->select_limit_cnt= HA_POS_ERROR;		// no limit
1734
    if (unit->select_limit_cnt == HA_POS_ERROR && !select_lex->next_select())
1735
      select_lex->options&= ~OPTION_FOUND_ROWS;
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1736 1737

    if (!(res=open_and_lock_tables(thd,tables)))
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monty@hundin.mysql.fi committed
1738
    {
1739
      if (lex->describe)
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bell@sanja.is.com.ua committed
1740
      {
1741 1742 1743 1744 1745 1746 1747
	if (!(result= new select_send()))
	{
	  send_error(thd, ER_OUT_OF_RESOURCES);
	  DBUG_VOID_RETURN;
	}
	else
	  thd->send_explain_fields(result);
1748
	fix_tables_pointers(lex->all_selects_list);
1749
	res= mysql_explain_union(thd, &thd->lex.unit, result);
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1750 1751
	MYSQL_LOCK *save_lock= thd->lock;
	thd->lock= (MYSQL_LOCK *)0;
1752
	result->send_eof();
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	thd->lock= save_lock;
      }
      else
      {
1757 1758
	if (!result)
	{
1759
	  if (!(result=new select_send()))
1760 1761 1762 1763 1764 1765 1766 1767 1768
	  {
	    res= -1;
#ifdef DELETE_ITEMS
	    delete select_lex->having;
	    delete select_lex->where;
#endif
	    break;
	  }
	}
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1769 1770 1771
	query_cache_store_query(thd, tables);
	res=handle_select(thd, lex, result);
      }
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1772
    }
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    break;
  }
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1775
  case SQLCOM_DO:
1776 1777 1778 1779 1780 1781 1782 1783
    if (tables && ((res= check_table_access(thd, SELECT_ACL, tables)) ||
		   (res= open_and_lock_tables(thd,tables))))
	break;

    fix_tables_pointers(lex->all_selects_list);
    res= mysql_do(thd, *lex->insert_list);
    if (thd->net.report_error)
      res= -1;
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1784 1785
    break;

1786
  case SQLCOM_EMPTY_QUERY:
1787
    send_ok(thd);
1788 1789
    break;

1790 1791 1792 1793
  case SQLCOM_HELP:
    res= mysqld_help(thd,lex->help_arg);
    break;

1794
#ifndef EMBEDDED_LIBRARY
1795
  case SQLCOM_PURGE:
1796
  {
1797
    if (check_global_access(thd, SUPER_ACL))
1798
      goto error;
1799
    // PURGE MASTER LOGS TO 'file'
1800 1801 1802
    res = purge_master_logs(thd, lex->to_log);
    break;
  }
1803 1804 1805 1806 1807 1808 1809 1810
  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;
  }
1811 1812
#endif

1813 1814
  case SQLCOM_SHOW_WARNS:
  {
1815 1816
    res= mysqld_show_warnings(thd, (ulong)
			      ((1L << (uint) MYSQL_ERROR::WARN_LEVEL_NOTE) |
1817 1818 1819
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_WARN) |
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR)
			       ));
1820 1821 1822 1823
    break;
  }
  case SQLCOM_SHOW_ERRORS:
  {
1824 1825
    res= mysqld_show_warnings(thd, (ulong)
			      (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR));
1826 1827
    break;
  }
1828 1829
  case SQLCOM_SHOW_NEW_MASTER:
  {
1830
    if (check_global_access(thd, REPL_SLAVE_ACL))
1831
      goto error;
1832
    /* This query don't work now. See comment in repl_failsafe.cc */
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1833
#ifndef WORKING_NEW_MASTER
1834
    net_printf(thd, ER_NOT_SUPPORTED_YET, "SHOW NEW MASTER");
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1835 1836
    res= 1;
#else
1837
    res = show_new_master(thd);
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1838
#endif
1839 1840
    break;
  }
1841

1842
#ifdef HAVE_REPLICATION
1843 1844
  case SQLCOM_SHOW_SLAVE_HOSTS:
  {
1845
    if (check_global_access(thd, REPL_SLAVE_ACL))
1846 1847 1848 1849
      goto error;
    res = show_slave_hosts(thd);
    break;
  }
1850 1851
  case SQLCOM_SHOW_BINLOG_EVENTS:
  {
1852
    if (check_global_access(thd, REPL_SLAVE_ACL))
1853 1854 1855 1856
      goto error;
    res = show_binlog_events(thd);
    break;
  }
1857 1858
#endif

1859
  case SQLCOM_BACKUP_TABLE:
1860 1861 1862
  {
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL, tables) ||
1863
	check_global_access(thd, FILE_ACL))
1864 1865
      goto error; /* purecov: inspected */
    res = mysql_backup_table(thd, tables);
1866

1867 1868
    break;
  }
1869
  case SQLCOM_RESTORE_TABLE:
1870 1871
  {
    if (check_db_used(thd,tables) ||
1872 1873
	check_table_access(thd, INSERT_ACL, tables) ||
	check_global_access(thd, FILE_ACL))
1874 1875 1876 1877
      goto error; /* purecov: inspected */
    res = mysql_restore_table(thd, tables);
    break;
  }
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1878 1879 1880 1881 1882 1883 1884 1885
  case SQLCOM_PRELOAD_KEYS:
  {
    if (check_db_used(thd, tables) ||
        check_access(thd, INDEX_ACL, tables->db, &tables->grant.privilege))
      goto error; 
    res = mysql_preload_keys(thd, tables);
    break;
  }
1886
#ifdef HAVE_REPLICATION
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1887
  case SQLCOM_CHANGE_MASTER:
1888
  {
1889
    if (check_global_access(thd, SUPER_ACL))
1890
      goto error;
1891 1892 1893
    LOCK_ACTIVE_MI;
    res = change_master(thd,active_mi);
    UNLOCK_ACTIVE_MI;
1894 1895
    break;
  }
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1896
  case SQLCOM_SHOW_SLAVE_STAT:
1897
  {
1898 1899
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
1900
      goto error;
1901 1902 1903
    LOCK_ACTIVE_MI;
    res = show_master_info(thd,active_mi);
    UNLOCK_ACTIVE_MI;
1904 1905
    break;
  }
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1906
  case SQLCOM_SHOW_MASTER_STAT:
1907
  {
1908 1909
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
1910 1911 1912 1913
      goto error;
    res = show_binlog_info(thd);
    break;
  }
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1914

1915
  case SQLCOM_LOAD_MASTER_DATA: // sync with master
1916
    if (check_global_access(thd, SUPER_ACL))
1917
      goto error;
1918 1919 1920 1921
    if (end_active_trans(thd))
      res= -1;
    else
      res = load_master_data(thd);
1922
    break;
1923
#endif /* HAVE_REPLICATION */
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1924 1925 1926
#ifdef HAVE_INNOBASE_DB
  case SQLCOM_SHOW_INNODB_STATUS:
    {
1927
      if (check_global_access(thd, SUPER_ACL))
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1928 1929 1930 1931 1932
	goto error;
      res = innodb_show_status(thd);
      break;
    }
#endif
1933
#ifdef HAVE_REPLICATION
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1934
  case SQLCOM_LOAD_MASTER_TABLE:
1935
  {
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1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947
    if (!tables->db)
      tables->db=thd->db;
    if (check_access(thd,CREATE_ACL,tables->db,&tables->grant.privilege))
      goto error;				/* purecov: inspected */
    if (grant_option)
    {
      /* Check that the first table has CREATE privilege */
      TABLE_LIST *tmp_table_list=tables->next;
      tables->next=0;
      bool error=check_grant(thd,CREATE_ACL,tables);
      tables->next=tmp_table_list;
      if (error)
1948
	goto error;
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1949
    }
1950
    if (strlen(tables->real_name) > NAME_LEN)
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1951
    {
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1952
      net_printf(thd,ER_WRONG_TABLE_NAME,tables->real_name);
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1953 1954
      break;
    }
1955 1956 1957 1958 1959
    LOCK_ACTIVE_MI;
    // fetch_master_table will send the error to the client on failure
    if (!fetch_master_table(thd, tables->db, tables->real_name,
			    active_mi, 0))
    {
1960
      send_ok(thd);
1961 1962
    }
    UNLOCK_ACTIVE_MI;
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1963
    break;
1964
  }
1965
#endif /* HAVE_REPLICATION */
1966

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1967
  case SQLCOM_CREATE_TABLE:
1968 1969 1970
  {
    ulong want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
		      CREATE_TMP_ACL : CREATE_ACL);
1971 1972
    if (!tables->db)
      tables->db=thd->db;
1973
    if (check_access(thd,want_priv,tables->db,&tables->grant.privilege) ||
1974 1975 1976
	check_merge_table_access(thd, tables->db,
				 (TABLE_LIST *)
				 lex->create_info.merge_list.first))
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1977
      goto error;				/* purecov: inspected */
1978
    if (grant_option && want_priv != CREATE_TMP_ACL)
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1979 1980 1981 1982
    {
      /* Check that the first table has CREATE privilege */
      TABLE_LIST *tmp_table_list=tables->next;
      tables->next=0;
1983
      bool error=check_grant(thd, want_priv, tables);
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1984 1985 1986 1987
      tables->next=tmp_table_list;
      if (error)
	goto error;
    }
1988
    if (strlen(tables->real_name) > NAME_LEN)
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1989
    {
monty@mashka.mysql.fi's avatar
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1990
      net_printf(thd, ER_WRONG_TABLE_NAME, tables->alias);
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1991 1992 1993
      res=0;
      break;
    }
1994 1995 1996
#ifndef HAVE_READLINK
    lex->create_info.data_file_name=lex->create_info.index_file_name=0;
#else
1997
    /* Fix names if symlinked tables */
1998
    if (append_file_to_dir(thd, &lex->create_info.data_file_name,
1999
			   tables->real_name) ||
2000
	append_file_to_dir(thd,&lex->create_info.index_file_name,
2001
			   tables->real_name))
2002 2003 2004 2005
    {
      res=-1;
      break;
    }
2006
#endif
2007
    if (select_lex->item_list.elements)		// With select
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2008 2009 2010 2011
    {
      select_result *result;

      if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
2012
	  find_real_table_in_list(tables->next, tables->db, tables->real_name))
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2013
      {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2014
	net_printf(thd,ER_UPDATE_TABLE_USED,tables->real_name);
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2015 2016 2017 2018 2019 2020 2021
	DBUG_VOID_RETURN;
      }
      if (tables->next)
      {
	if (check_table_access(thd, SELECT_ACL, tables->next))
	  goto error;				// Error message is given
      }
2022
      select_lex->options|= SELECT_NO_UNLOCK;
2023 2024 2025 2026 2027
      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
2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043

      /* 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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2044 2045
    else // regular create
    {
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2046 2047 2048 2049
      if (lex->name)
        res= mysql_create_like_table(thd, tables, &lex->create_info, 
                                     (Table_ident *)lex->name); 
      else
2050
      {
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2051 2052 2053 2054
        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
2055
      }
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2056
      if (!res)
2057
	send_ok(thd);
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2058 2059
    }
    break;
2060
  }
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2061 2062 2063 2064 2065 2066 2067
  case SQLCOM_CREATE_INDEX:
    if (!tables->db)
      tables->db=thd->db;
    if (check_access(thd,INDEX_ACL,tables->db,&tables->grant.privilege))
      goto error; /* purecov: inspected */
    if (grant_option && check_grant(thd,INDEX_ACL,tables))
      goto error;
2068 2069 2070 2071
    if (end_active_trans(thd))
      res= -1;
    else
      res = mysql_create_index(thd, tables, lex->key_list);
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2072 2073
    break;

2074
#ifdef HAVE_REPLICATION
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2075
  case SQLCOM_SLAVE_START:
2076 2077 2078 2079
  {
    LOCK_ACTIVE_MI;
    start_slave(thd,active_mi,1 /* net report*/);
    UNLOCK_ACTIVE_MI;
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2080
    break;
2081
  }
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2082
  case SQLCOM_SLAVE_STOP:
2083 2084 2085 2086 2087 2088
  /*
    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,
2089
      so it waits for the client thread because t is locked by it.
2090
    - then the client thread does SLAVE STOP.
2091 2092
      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.
2093 2094 2095 2096 2097
    To prevent that, refuse SLAVE STOP if the
    client thread has locked tables
  */
  if (thd->locked_tables || thd->active_transaction())
  {
2098
    send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
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2099
    break;
2100
  }
2101 2102 2103 2104
  {
    LOCK_ACTIVE_MI;
    stop_slave(thd,active_mi,1/* net report*/);
    UNLOCK_ACTIVE_MI;
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2105
    break;
2106
  }
2107
#endif /* HAVE_REPLICATION */
2108

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2109 2110
  case SQLCOM_ALTER_TABLE:
#if defined(DONT_ALLOW_SHOW_COMMANDS)
2111
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
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2112 2113 2114
    break;
#else
    {
2115
      ulong priv=0;
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2116
      if (lex->name && (!lex->name[0] || strlen(lex->name) > NAME_LEN))
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2117
      {
2118
	net_printf(thd,ER_WRONG_TABLE_NAME,lex->name);
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2119 2120 2121
	res=0;
	break;
      }
2122 2123
      if (!tables->db)
	tables->db=thd->db;
2124 2125
      if (!select_lex->db)
	select_lex->db=tables->db;
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2126
      if (check_access(thd,ALTER_ACL,tables->db,&tables->grant.privilege) ||
2127
	  check_access(thd,INSERT_ACL | CREATE_ACL,select_lex->db,&priv) ||
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2128
	  check_merge_table_access(thd, tables->db,
2129 2130 2131
				   (TABLE_LIST *)
				   lex->create_info.merge_list.first))
	goto error;				/* purecov: inspected */
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2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142
      if (!tables->db)
	tables->db=thd->db;
      if (grant_option)
      {
	if (check_grant(thd,ALTER_ACL,tables))
	  goto error;
	if (lex->name && !test_all_bits(priv,INSERT_ACL | CREATE_ACL))
	{					// Rename of table
	  TABLE_LIST tmp_table;
	  bzero((char*) &tmp_table,sizeof(tmp_table));
	  tmp_table.real_name=lex->name;
2143
	  tmp_table.db=select_lex->db;
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2144 2145 2146 2147 2148
	  tmp_table.grant.privilege=priv;
	  if (check_grant(thd,INSERT_ACL | CREATE_ACL,tables))
	    goto error;
	}
      }
2149 2150
      /* 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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2151
      /* ALTER TABLE ends previous transaction */
2152
      if (end_active_trans(thd))
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2153 2154
	res= -1;
      else
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2155
      {
2156
	res= mysql_alter_table(thd, select_lex->db, lex->name,
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2157 2158 2159
			       &lex->create_info,
			       tables, lex->create_list,
			       lex->key_list, lex->drop_list, lex->alter_list,
2160
			       select_lex->order_list.elements,
2161
                               (ORDER *) select_lex->order_list.first,
2162 2163
			       lex->drop_primary, lex->duplicates,
			       lex->alter_keys_onoff, lex->simple_alter);
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2164
      }
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2165 2166 2167
      break;
    }
#endif
2168
  case SQLCOM_RENAME_TABLE:
2169 2170 2171
  {
    TABLE_LIST *table;
    if (check_db_used(thd,tables))
2172
      goto error;
2173 2174
    for (table=tables ; table ; table=table->next->next)
    {
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2175 2176
      if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
		       &table->grant.privilege) ||
2177 2178 2179 2180 2181
	  check_access(thd, INSERT_ACL | CREATE_ACL, table->next->db,
		       &table->next->grant.privilege))
	goto error;
      if (grant_option)
      {
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2182 2183 2184 2185 2186
	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) ||
2187
	    (!test_all_bits(table->next->grant.privilege,
2188
			    INSERT_ACL | CREATE_ACL) &&
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monty@donna.mysql.com committed
2189
	     check_grant(thd,INSERT_ACL | CREATE_ACL, &new_list)))
2190 2191 2192
	  goto error;
      }
    }
2193
    query_cache_invalidate3(thd, tables, 0);
2194 2195 2196
    if (end_active_trans(thd))
      res= -1;
    else if (mysql_rename_tables(thd,tables))
2197 2198
      res= -1;
    break;
2199
  }
2200
#ifndef EMBEDDED_LIBRARY
2201 2202
  case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2203
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
2204 2205 2206
    DBUG_VOID_RETURN;
#else
    {
2207
      if (check_global_access(thd, SUPER_ACL))
2208 2209 2210 2211
	goto error;
      res = show_binlogs(thd);
      break;
    }
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2212
#endif
2213
#endif /* EMBEDDED_LIBRARY */
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2214
  case SQLCOM_SHOW_CREATE:
2215
#ifdef DONT_ALLOW_SHOW_COMMANDS
2216
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
2217 2218
    DBUG_VOID_RETURN;
#else
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2219
    {
2220 2221 2222 2223
      if (check_db_used(thd, tables) ||
	  check_access(thd, SELECT_ACL | EXTRA_ACL, tables->db,
		       &tables->grant.privilege))
	goto error;
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2224
      res = mysqld_show_create(thd, tables);
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2225 2226
      break;
    }
2227
#endif
2228 2229 2230 2231 2232
  case SQLCOM_CHECKSUM:
  {
    if (check_db_used(thd,tables) ||
	check_table_access(thd, SELECT_ACL | EXTRA_ACL , tables))
      goto error; /* purecov: inspected */
2233
    res = mysql_checksum_table(thd, tables, &lex->check_opt);
2234 2235
    break;
  }
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2236
  case SQLCOM_REPAIR:
2237 2238 2239 2240 2241
  {
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables))
      goto error; /* purecov: inspected */
    res = mysql_repair_table(thd, tables, &lex->check_opt);
2242 2243 2244 2245 2246 2247 2248 2249 2250 2251
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      mysql_update_log.write(thd, thd->query, thd->query_length);
      if (mysql_bin_log.is_open())
      {
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
        mysql_bin_log.write(&qinfo);
      }
    }
2252 2253
    break;
  }
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2254
  case SQLCOM_CHECK:
2255 2256 2257 2258 2259 2260 2261
  {
    if (check_db_used(thd,tables) ||
	check_table_access(thd, SELECT_ACL | EXTRA_ACL , tables))
      goto error; /* purecov: inspected */
    res = mysql_check_table(thd, tables, &lex->check_opt);
    break;
  }
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2262 2263
  case SQLCOM_ANALYZE:
  {
2264 2265
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables))
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2266
      goto error; /* purecov: inspected */
2267
    res = mysql_analyze_table(thd, tables, &lex->check_opt);
2268 2269 2270 2271 2272 2273 2274 2275 2276 2277
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      mysql_update_log.write(thd, thd->query, thd->query_length);
      if (mysql_bin_log.is_open())
      {
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
        mysql_bin_log.write(&qinfo);
      }
    }
2278
    break;
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2279
  }
2280

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2281 2282 2283
  case SQLCOM_OPTIMIZE:
  {
    HA_CREATE_INFO create_info;
2284 2285
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables))
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2286
      goto error; /* purecov: inspected */
2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297
    if (specialflag & (SPECIAL_SAFE_MODE | SPECIAL_NO_NEW_FUNC))
    {
      /* Use ALTER TABLE */
      lex->create_list.empty();
      lex->key_list.empty();
      lex->col_list.empty();
      lex->drop_list.empty();
      lex->alter_list.empty();
      bzero((char*) &create_info,sizeof(create_info));
      create_info.db_type=DB_TYPE_DEFAULT;
      create_info.row_type=ROW_TYPE_DEFAULT;
2298
      create_info.table_charset=default_charset_info;
2299 2300 2301
      res= mysql_alter_table(thd, NullS, NullS, &create_info,
			     tables, lex->create_list,
			     lex->key_list, lex->drop_list, lex->alter_list,
2302 2303
                             0, (ORDER *) 0,
			     0, DUP_ERROR);
2304 2305 2306
    }
    else
      res = mysql_optimize_table(thd, tables, &lex->check_opt);
2307 2308 2309 2310 2311 2312 2313 2314 2315 2316
    /* ! we write after unlocking the table */
    if (!res && !lex->no_write_to_binlog)
    {
      mysql_update_log.write(thd, thd->query, thd->query_length);
      if (mysql_bin_log.is_open())
      {
        Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
        mysql_bin_log.write(&qinfo);
      }
    }
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2317 2318 2319
    break;
  }
  case SQLCOM_UPDATE:
2320
    if (check_db_used(thd,tables))
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bk@work.mysql.com committed
2321
      goto error;
2322

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bell@sanja.is.com.ua committed
2323
    if (single_table_command_access(thd, UPDATE_ACL, tables, &res))
2324
	goto error;
2325

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

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bell@sanja.is.com.ua committed
2380
    if (single_table_command_access(thd, privilege, tables, &res))
2381 2382
	goto error;

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

2399 2400 2401 2402
    /*
      Check that we have modify privileges for the first table and
      select privileges for the rest
    */
2403
    {
2404 2405
      ulong privilege= (lex->duplicates == DUP_REPLACE ?
                        INSERT_ACL | DELETE_ACL : INSERT_ACL);
2406 2407 2408 2409 2410 2411 2412 2413 2414 2415
      TABLE_LIST *save_next=tables->next;
      tables->next=0;
      if (check_access(thd, privilege,
		       tables->db,&tables->grant.privilege) ||
	  (grant_option && check_grant(thd, privilege, tables)))
	goto error;
      tables->next=save_next;
      if ((res=check_table_access(thd, SELECT_ACL, save_next)))
	goto error;
    }
2416 2417
    /* Don't unlock tables until command is written to binary log */
    select_lex->options|= SELECT_NO_UNLOCK;
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2418 2419

    select_result *result;
2420 2421 2422 2423
    unit->offset_limit_cnt= select_lex->offset_limit;
    unit->select_limit_cnt= select_lex->select_limit+select_lex->offset_limit;
    if (unit->select_limit_cnt < select_lex->select_limit)
      unit->select_limit_cnt= HA_POS_ERROR;		// No limit
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bk@work.mysql.com committed
2424

2425
    if (find_real_table_in_list(tables->next, tables->db, tables->real_name))
2426
    {
2427 2428
      /* Using same table for INSERT and SELECT */
      select_lex->options |= OPTION_BUFFER_RESULT;
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2429
    }
2430 2431 2432 2433

    /* 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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2434 2435
    lex->select_lex.resolve_mode= SELECT_LEX::NOMATTER_MODE;

2436 2437 2438
    if (!(res=open_and_lock_tables(thd, tables)))
    {
      if ((result=new select_insert(tables->table,&lex->field_list,
2439
				    lex->duplicates)))
2440
	res=handle_select(thd,lex,result);
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2441 2442
      if (thd->net.report_error)
	res= -1;
2443 2444 2445
    }
    else
      res= -1;
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2446 2447
    break;
  }
2448
  case SQLCOM_TRUNCATE:
2449 2450
    if (check_access(thd,DELETE_ACL,tables->db,&tables->grant.privilege))
      goto error; /* purecov: inspected */
2451 2452
    if (grant_option && check_grant(thd,DELETE_ACL,tables))
      goto error;
2453 2454 2455 2456 2457 2458
    /*
      Don't allow this within a transaction because we want to use
      re-generate table
    */
    if (thd->locked_tables || thd->active_transaction())
    {
2459
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION,NullS);
2460 2461 2462 2463
      goto error;
    }
    res=mysql_truncate(thd,tables);
    break;
2464
  case SQLCOM_DELETE:
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2465
  {
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2466 2467
    if (single_table_command_access(thd, DELETE_ACL, tables, &res))
      goto error;
2468

bk@work.mysql.com's avatar
bk@work.mysql.com committed
2469 2470
    // Set privilege for the WHERE clause
    tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
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2471 2472
    res = mysql_delete(thd,tables, select_lex->where,
                       (ORDER*) select_lex->order_list.first,
2473
                       select_lex->select_limit, select_lex->options);
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2474 2475
    if (thd->net.report_error)
      res= -1;
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bk@work.mysql.com committed
2476 2477
    break;
  }
2478
  case SQLCOM_DELETE_MULTI:
2479 2480 2481 2482 2483
  {
    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
2484

2485 2486
    /* sql_yacc guarantees that tables and aux_tables are not zero */
    if (check_db_used(thd, tables) || check_db_used(thd,aux_tables) ||
2487
	check_table_access(thd,SELECT_ACL, tables) ||
2488 2489 2490
	check_table_access(thd,DELETE_ACL, aux_tables))
      goto error;
    if ((thd->options & OPTION_SAFE_UPDATES) && !select_lex->where)
2491
    {
2492
      send_error(thd,ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE);
2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507
      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)
      {
2508
	net_printf(thd,ER_NONUNIQ_TABLE,auxi->real_name);
2509 2510
	goto error;
      }
2511
      walk->lock_type= auxi->lock_type;
2512
      auxi->table_list=  walk;		// Remember corresponding table
2513
    }
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2514
    if (add_item_to_list(thd, new Item_null()))
2515
    {
2516
      res= -1;
2517
      break;
2518 2519 2520 2521 2522 2523
    }
    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)
2524
      auxi->table= auxi->table_list->table;
2525
    if (&lex->select_lex != lex->all_selects_list)
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2526
    {
2527 2528 2529 2530 2531
      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
2532
	  my_error(ER_UPDATE_TABLE_USED, MYF(0), t->real_name);
2533 2534 2535 2536
	  res= -1;
	  break;
	}
      }
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2537
    }
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2538
    fix_tables_pointers(lex->all_selects_list);
2539 2540
    if (!thd->is_fatal_error && (result= new multi_delete(thd,aux_tables,
							  table_count)))
2541
    {
2542 2543 2544
      res= mysql_select(thd, &select_lex->ref_pointer_array,
			select_lex->get_table_list(),
			select_lex->with_wild,
2545
			select_lex->item_list,
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bell@sanja.is.com.ua committed
2546
			select_lex->where,
2547
			0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
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bell@sanja.is.com.ua committed
2548 2549
			(ORDER *)NULL,
			select_lex->options | thd->options |
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
2550
			SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK,
2551
			result, unit, select_lex, 0);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2552 2553
      if (thd->net.report_error)
	res= -1;
2554
      delete result;
2555 2556 2557 2558 2559 2560
    }
    else
      res= -1;					// Error is not sent
    close_thread_tables(thd);
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2561
  case SQLCOM_DROP_TABLE:
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
2562
  {
2563 2564 2565 2566 2567 2568 2569 2570 2571 2572
    if (!lex->drop_temporary)
    {
      if (check_table_access(thd,DROP_ACL,tables))
	goto error;				/* purecov: inspected */
      if (end_active_trans(thd))
      {
	res= -1;
	break;
      }
    }
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
2573
    else
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585
    {
      /*
	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;
    }
2586
    res= mysql_rm_table(thd,tables,lex->drop_if_exists, lex->drop_temporary);
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monty@tik.mysql.fi committed
2587 2588
  }
  break;
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bk@work.mysql.com committed
2589 2590 2591 2592 2593 2594 2595
  case SQLCOM_DROP_INDEX:
    if (!tables->db)
      tables->db=thd->db;
    if (check_access(thd,INDEX_ACL,tables->db,&tables->grant.privilege))
      goto error;				/* purecov: inspected */
    if (grant_option && check_grant(thd,INDEX_ACL,tables))
      goto error;
2596 2597 2598 2599
    if (end_active_trans(thd))
      res= -1;
    else
      res = mysql_drop_index(thd, tables, lex->drop_list);
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2600 2601
    break;
  case SQLCOM_SHOW_DATABASES:
2602
#if defined(DONT_ALLOW_SHOW_COMMANDS)
2603
    send_error(thd,ER_NOT_ALLOWED_COMMAND);   /* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2604 2605 2606
    DBUG_VOID_RETURN;
#else
    if ((specialflag & SPECIAL_SKIP_SHOW_DB) &&
2607
	check_global_access(thd, SHOW_DB_ACL))
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bk@work.mysql.com committed
2608 2609 2610 2611 2612
      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
2613
#ifndef EMBEDDED_LIBRARY
2614
    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2615
      break;
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hf@deer.(none) committed
2616
#endif
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2617 2618 2619
    mysqld_list_processes(thd,thd->master_access & PROCESS_ACL ? NullS :
			  thd->priv_user,lex->verbose);
    break;
2620 2621 2622 2623 2624 2625 2626 2627 2628
  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
2629
  case SQLCOM_SHOW_STATUS:
2630
    res= mysqld_show(thd,(lex->wild ? lex->wild->ptr() : NullS),status_vars,
2631
		     OPT_GLOBAL, &LOCK_status);
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bk@work.mysql.com committed
2632 2633 2634
    break;
  case SQLCOM_SHOW_VARIABLES:
    res= mysqld_show(thd, (lex->wild ? lex->wild->ptr() : NullS),
2635 2636
		     init_vars, lex->option_type,
		     &LOCK_global_system_variables);
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2637
    break;
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tim@cane.mysql.fi committed
2638 2639
  case SQLCOM_SHOW_LOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2640
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
tim@cane.mysql.fi's avatar
tim@cane.mysql.fi committed
2641 2642 2643 2644 2645 2646 2647 2648 2649
    DBUG_VOID_RETURN;
#else
    {
      if (grant_option && check_access(thd, FILE_ACL, any_db))
	goto error;
      res= mysqld_show_logs(thd);
      break;
    }
#endif
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bk@work.mysql.com committed
2650
  case SQLCOM_SHOW_TABLES:
2651
    /* FALL THROUGH */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2652
#ifdef DONT_ALLOW_SHOW_COMMANDS
2653
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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bk@work.mysql.com committed
2654 2655 2656
    DBUG_VOID_RETURN;
#else
    {
2657
      char *db=select_lex->db ? select_lex->db : thd->db;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2658 2659
      if (!db)
      {
2660
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
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bk@work.mysql.com committed
2661 2662 2663
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);				// Fix escaped '_'
2664
      if (check_db_name(db))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2665
      {
2666
        net_printf(thd,ER_WRONG_DB_NAME, db);
2667
        goto error;
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bk@work.mysql.com committed
2668 2669 2670
      }
      if (check_access(thd,SELECT_ACL,db,&thd->col_access))
	goto error;				/* purecov: inspected */
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2671
      if (!thd->col_access && check_grant_db(thd,db))
2672
      {
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2673
	net_printf(thd, ER_DBACCESS_DENIED_ERROR,
2674 2675 2676 2677 2678
		   thd->priv_user,
		   thd->priv_host,
		   db);
	goto error;
      }
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bk@work.mysql.com committed
2679
      /* grant is checked in mysqld_show_tables */
2680
      if (select_lex->options & SELECT_DESCRIBE)
2681
        res= mysqld_extend_show_tables(thd,db,
2682
				       (lex->wild ? lex->wild->ptr() : NullS));
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bk@work.mysql.com committed
2683 2684 2685 2686 2687 2688
      else
	res= mysqld_show_tables(thd,db,
				(lex->wild ? lex->wild->ptr() : NullS));
      break;
    }
#endif
2689 2690 2691
  case SQLCOM_SHOW_OPEN_TABLES:
    res= mysqld_show_open_tables(thd,(lex->wild ? lex->wild->ptr() : NullS));
    break;
2692 2693
  case SQLCOM_SHOW_CHARSETS:
    res= mysqld_show_charsets(thd,(lex->wild ? lex->wild->ptr() : NullS));
2694
    break;
2695 2696 2697
  case SQLCOM_SHOW_COLLATIONS:
    res= mysqld_show_collations(thd,(lex->wild ? lex->wild->ptr() : NullS));
    break;
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2698 2699
  case SQLCOM_SHOW_FIELDS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2700
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2701 2702 2703
    DBUG_VOID_RETURN;
#else
    {
2704 2705
      char *db=tables->db;
      if (!*db)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2706
      {
2707
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
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bk@work.mysql.com committed
2708 2709 2710
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);			// Fix escaped '_'
2711
      remove_escape(tables->real_name);
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bk@work.mysql.com committed
2712 2713 2714 2715 2716 2717
      if (check_access(thd,SELECT_ACL | EXTRA_ACL,db,&thd->col_access))
	goto error;				/* purecov: inspected */
      tables->grant.privilege=thd->col_access;
      if (grant_option && check_grant(thd,SELECT_ACL,tables,2))
	goto error;
      res= mysqld_show_fields(thd,tables,
monty@donna.mysql.com's avatar
monty@donna.mysql.com committed
2718 2719
			      (lex->wild ? lex->wild->ptr() : NullS),
			      lex->verbose);
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2720 2721 2722 2723 2724
      break;
    }
#endif
  case SQLCOM_SHOW_KEYS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2725
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2726 2727 2728
    DBUG_VOID_RETURN;
#else
    {
2729
      char *db=tables->db;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2730 2731
      if (!db)
      {
2732
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
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bk@work.mysql.com committed
2733 2734 2735
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);			// Fix escaped '_'
2736
      remove_escape(tables->real_name);
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bk@work.mysql.com committed
2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748
      if (!tables->db)
	tables->db=thd->db;
      if (check_access(thd,SELECT_ACL,db,&thd->col_access))
	goto error; /* purecov: inspected */
      tables->grant.privilege=thd->col_access;
      if (grant_option && check_grant(thd,SELECT_ACL,tables,2))
	goto error;
      res= mysqld_show_keys(thd,tables);
      break;
    }
#endif
  case SQLCOM_CHANGE_DB:
2749
    mysql_change_db(thd,select_lex->db);
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2750
    break;
2751

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2752 2753 2754
  case SQLCOM_LOAD:
  {
    uint privilege= (lex->duplicates == DUP_REPLACE ?
2755
		     INSERT_ACL | DELETE_ACL : INSERT_ACL);
2756 2757

    if (!lex->local_file)
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2758 2759 2760 2761 2762 2763
    {
      if (check_access(thd,privilege | FILE_ACL,tables->db))
	goto error;
    }
    else
    {
2764
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
2765
	  ! opt_local_infile)
2766
      {
2767
	send_error(thd,ER_NOT_ALLOWED_COMMAND);
2768 2769
	goto error;
      }
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bk@work.mysql.com committed
2770
      if (check_access(thd,privilege,tables->db,&tables->grant.privilege) ||
2771
	  grant_option && check_grant(thd,privilege,tables))
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2772 2773 2774 2775 2776 2777
	goto error;
    }
    res=mysql_load(thd, lex->exchange, tables, lex->field_list,
		   lex->duplicates, (bool) lex->local_file, lex->lock_option);
    break;
  }
2778

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2779
  case SQLCOM_SET_OPTION:
2780 2781 2782 2783 2784
    if (tables && ((res= check_table_access(thd, SELECT_ACL, tables)) ||
		   (res= open_and_lock_tables(thd,tables))))
      break;
    fix_tables_pointers(lex->all_selects_list);
    if (!(res= sql_set_variables(thd, &lex->var_list)))
2785
      send_ok(thd);
2786 2787
    if (thd->net.report_error)
      res= -1;
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bk@work.mysql.com committed
2788
    break;
2789

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bk@work.mysql.com committed
2790
  case SQLCOM_UNLOCK_TABLES:
2791
    unlock_locked_tables(thd);
2792 2793
    if (thd->options & OPTION_TABLE_LOCK)
    {
2794
      end_active_trans(thd);
2795
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
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bk@work.mysql.com committed
2796 2797
    }
    if (thd->global_read_lock)
2798
      unlock_global_read_lock(thd);
2799
    send_ok(thd);
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2800 2801
    break;
  case SQLCOM_LOCK_TABLES:
2802
    unlock_locked_tables(thd);
2803
    if (check_db_used(thd,tables) || end_active_trans(thd))
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bk@work.mysql.com committed
2804
      goto error;
2805
    if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, tables))
2806
      goto error;
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bk@work.mysql.com committed
2807
    thd->in_lock_tables=1;
2808
    thd->options|= OPTION_TABLE_LOCK;
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2809 2810 2811 2812
    if (!(res=open_and_lock_tables(thd,tables)))
    {
      thd->locked_tables=thd->lock;
      thd->lock=0;
2813
      send_ok(thd);
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bk@work.mysql.com committed
2814
    }
2815 2816
    else
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
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2817 2818 2819
    thd->in_lock_tables=0;
    break;
  case SQLCOM_CREATE_DB:
2820
  {
monty@hundin.mysql.fi's avatar
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2821
    if (!strip_sp(lex->name) || check_db_name(lex->name))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2822
    {
2823
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
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bk@work.mysql.com committed
2824 2825
      break;
    }
2826 2827 2828 2829 2830 2831 2832
    /*
      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.
    */
2833
#ifdef HAVE_REPLICATION
2834 2835 2836
    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
2837 2838
    {
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
2839
      break;
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guilhem@mysql.com committed
2840
    }
2841
#endif
2842 2843
    if (check_access(thd,CREATE_ACL,lex->name,0,1))
      break;
2844
    res=mysql_create_db(thd,lex->name,&lex->create_info,0);
2845 2846
    break;
  }
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bk@work.mysql.com committed
2847
  case SQLCOM_DROP_DB:
2848
  {
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monty@hundin.mysql.fi committed
2849
    if (!strip_sp(lex->name) || check_db_name(lex->name))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2850
    {
2851
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
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bk@work.mysql.com committed
2852 2853
      break;
    }
2854 2855 2856 2857 2858 2859 2860
    /*
      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.
    */
2861
#ifdef HAVE_REPLICATION
2862 2863 2864
    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
2865 2866
    {
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
2867
      break;
guilhem@mysql.com's avatar
guilhem@mysql.com committed
2868
    }
2869
#endif
2870
    if (check_access(thd,DROP_ACL,lex->name,0,1))
2871
      break;
2872 2873
    if (thd->locked_tables || thd->active_transaction())
    {
2874
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
2875 2876
      goto error;
    }
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monty@hundin.mysql.fi committed
2877
    res=mysql_rm_db(thd,lex->name,lex->drop_if_exists,0);
2878 2879
    break;
  }
2880 2881 2882 2883
  case SQLCOM_ALTER_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
2884
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
2885 2886
      break;
    }
2887
    if (check_access(thd,ALTER_ACL,lex->name,0,1))
2888 2889 2890
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
2891
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
2892 2893
      goto error;
    }
2894
    res=mysql_alter_db(thd,lex->name,&lex->create_info);
2895 2896
    break;
  }
2897 2898 2899 2900
  case SQLCOM_SHOW_CREATE_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
2901
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
2902 2903 2904 2905 2906 2907
      break;
    }
    if (check_access(thd,DROP_ACL,lex->name,0,1))
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
2908
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
2909 2910
      goto error;
    }
2911
    res=mysqld_show_create_db(thd,lex->name,&lex->create_info);
2912 2913
    break;
  }
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2914 2915 2916 2917 2918
  case SQLCOM_CREATE_FUNCTION:
    if (check_access(thd,INSERT_ACL,"mysql",0,1))
      break;
#ifdef HAVE_DLOPEN
    if (!(res = mysql_create_function(thd,&lex->udf)))
2919
      send_ok(thd);
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bk@work.mysql.com committed
2920 2921 2922 2923 2924 2925 2926 2927
#else
    res= -1;
#endif
    break;
  case SQLCOM_DROP_FUNCTION:
    if (check_access(thd,DELETE_ACL,"mysql",0,1))
      break;
#ifdef HAVE_DLOPEN
2928
    if (!(res = mysql_drop_function(thd,&lex->udf.name)))
2929
      send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2930 2931 2932 2933
#else
    res= -1;
#endif
    break;
2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947 2948 2949 2950 2951 2952 2953 2954 2955 2956 2957 2958 2959 2960 2961 2962 2963 2964 2965
  case SQLCOM_DROP_USER:
  {
    if (check_access(thd, GRANT_ACL,"mysql",0,1))
      break;
    if (!(res= mysql_drop_user(thd, lex->users_list)))
    {
      mysql_update_log.write(thd, thd->query, thd->query_length);
      if (mysql_bin_log.is_open())
      {
	Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
	mysql_bin_log.write(&qinfo);
      }
      send_ok(thd);
    }
    break;
  }
  case SQLCOM_REVOKE_ALL:
  {
    if (check_access(thd, GRANT_ACL ,"mysql",0,1))
      break;
    if (!(res = mysql_revoke_all(thd, lex->users_list)))
    {
      mysql_update_log.write(thd, thd->query, thd->query_length);
      if (mysql_bin_log.is_open())
      {
	Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
	mysql_bin_log.write(&qinfo);
      }
      send_ok(thd);
    }
    break;
  }
2966 2967 2968 2969 2970 2971 2972 2973 2974
  case SQLCOM_REVOKE:
  case SQLCOM_GRANT:
  {
    if (check_access(thd, lex->grant | lex->grant_tot_col | GRANT_ACL,
		     tables && tables->db ? tables->db : select_lex->db,
		     tables ? &tables->grant.privilege : 0,
		     tables ? 0 : 1))
      goto error;

2975 2976 2977 2978
    /*
      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
    */
2979 2980 2981 2982 2983 2984 2985 2986 2987 2988

    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 &&
2989
	     my_strcasecmp(&my_charset_latin1,
2990
                           user->host.str, thd->host_or_ip)))
2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004
	{
	  if (check_access(thd, UPDATE_ACL, "mysql",0,1))
	    goto error;
	  break;			// We are allowed to do changes
	}
      }
    }
    if (tables)
    {
      if (grant_option && check_grant(thd,
				      (lex->grant | lex->grant_tot_col |
				       GRANT_ACL),
				      tables))
	goto error;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3005 3006 3007
      if (!(res = mysql_table_grant(thd,tables,lex->users_list, lex->columns,
				    lex->grant,
				    lex->sql_command == SQLCOM_REVOKE)))
3008
      {
3009
	mysql_update_log.write(thd, thd->query, thd->query_length);
3010 3011
	if (mysql_bin_log.is_open())
	{
3012
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
3013 3014 3015 3016 3017 3018 3019 3020
	  mysql_bin_log.write(&qinfo);
	}
      }
    }
    else
    {
      if (lex->columns.elements)
      {
3021
	send_error(thd,ER_ILLEGAL_GRANT_FOR_TABLE);
3022 3023 3024 3025 3026 3027 3028
	res=1;
      }
      else
	res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
			  lex->sql_command == SQLCOM_REVOKE);
      if (!res)
      {
3029
	mysql_update_log.write(thd, thd->query, thd->query_length);
3030 3031
	if (mysql_bin_log.is_open())
	{
3032
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
3033 3034
	  mysql_bin_log.write(&qinfo);
	}
3035
	if (mqh_used && lex->sql_command == SQLCOM_GRANT)
3036
	{
3037 3038 3039
	  List_iterator <LEX_USER> str_list(lex->users_list);
	  LEX_USER *user;
	  while ((user=str_list++))
3040
	    reset_mqh(thd,user);
3041
	}
3042 3043 3044 3045
      }
    }
    break;
  }
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monty@donna.mysql.com committed
3046
  case SQLCOM_RESET:
3047 3048 3049 3050 3051 3052 3053
    /* 
       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:
  {
3054
    if (check_global_access(thd,RELOAD_ACL) || check_db_used(thd, tables))
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bk@work.mysql.com committed
3055
      goto error;
3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077 3078 3079
    /*
      reload_acl_and_cache() will tell us if we are allowed to write to the
      binlog or not.
    */
    bool write_to_binlog;
    if (reload_acl_and_cache(thd, lex->type, tables, &write_to_binlog))
      send_error(thd, 0);
    else
    {
      /*
        We WANT to write and we CAN write.
        ! we write after unlocking the table.
      */
      if (!lex->no_write_to_binlog && write_to_binlog)
      {
        mysql_update_log.write(thd, thd->query, thd->query_length);
        if (mysql_bin_log.is_open())
        {
          Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
          mysql_bin_log.write(&qinfo);
        }
      }
      send_ok(thd);
    }
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bk@work.mysql.com committed
3080
    break;
3081
  }
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3082 3083 3084 3085 3086
  case SQLCOM_KILL:
    kill_one_thread(thd,lex->thread_id);
    break;
  case SQLCOM_SHOW_GRANTS:
    res=0;
3087 3088
    if ((thd->priv_user &&
	 !strcmp(thd->priv_user,lex->grant_user->user.str)) ||
3089
	!check_access(thd, SELECT_ACL, "mysql",0,1))
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bk@work.mysql.com committed
3090 3091 3092 3093
    {
      res = mysql_show_grants(thd,lex->grant_user);
    }
    break;
3094
  case SQLCOM_HA_OPEN:
3095 3096
    if (check_db_used(thd,tables) ||
	check_table_access(thd,SELECT_ACL, tables))
3097 3098 3099 3100 3101 3102 3103 3104 3105
      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:
3106 3107 3108 3109 3110
    /*
      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
3111
    if (check_db_used(thd,tables))
3112
      goto error;
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3113
    res = mysql_ha_read(thd, tables, lex->ha_read_mode, lex->backup_dir,
3114 3115
			lex->insert_list, lex->ha_rkey_mode, select_lex->where,
			select_lex->select_limit, select_lex->offset_limit);
3116 3117
    break;

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bk@work.mysql.com committed
3118
  case SQLCOM_BEGIN:
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monty@tik.mysql.fi committed
3119 3120 3121 3122 3123 3124
    if (thd->locked_tables)
    {
      thd->lock=thd->locked_tables;
      thd->locked_tables=0;			// Will be automaticly closed
      close_thread_tables(thd);			// Free tables
    }
3125 3126 3127 3128 3129 3130
    if (end_active_trans(thd))
    {
      res= -1;
    }
    else
    {
3131
      thd->options= ((thd->options & (ulong) ~(OPTION_STATUS_NO_TRANS_UPDATE)) |
3132 3133
		     OPTION_BEGIN);
      thd->server_status|= SERVER_STATUS_IN_TRANS;
3134
      send_ok(thd);
3135
    }
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bk@work.mysql.com committed
3136 3137
    break;
  case SQLCOM_COMMIT:
3138 3139 3140 3141 3142
    /*
      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
3143
  {
3144
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3145 3146
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    if (!ha_commit(thd))
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3147
    {
3148
      send_ok(thd);
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3149
    }
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bk@work.mysql.com committed
3150 3151 3152
    else
      res= -1;
    break;
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monty@hundin.mysql.fi committed
3153
  }
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3154 3155 3156
  case SQLCOM_ROLLBACK:
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    if (!ha_rollback(thd))
3157
    {
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3158 3159 3160 3161 3162 3163 3164 3165 3166 3167
      /*
        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)
3168
	send_warning(thd,ER_WARNING_NOT_COMPLETE_ROLLBACK,0);
3169
      else
3170
	send_ok(thd);
3171
    }
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3172 3173
    else
      res= -1;
3174
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
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bk@work.mysql.com committed
3175
    break;
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3176 3177 3178
  case SQLCOM_ROLLBACK_TO_SAVEPOINT:
    if (!ha_rollback_to_savepoint(thd, lex->savepoint_name))
    {
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guilhem@mysql.com committed
3179
      if ((thd->options & OPTION_STATUS_NO_TRANS_UPDATE) && !thd->slave_thread)
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
3180
	send_warning(thd, ER_WARNING_NOT_COMPLETE_ROLLBACK, 0);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3181
      else
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
3182
	send_ok(thd);
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heikki@hundin.mysql.fi committed
3183 3184 3185 3186
    }
    else
      res= -1;
    break;
3187
  case SQLCOM_SAVEPOINT:
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3188
    if (!ha_savepoint(thd, lex->savepoint_name))
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
3189
      send_ok(thd);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3190 3191
    else
      res= -1;
3192
    break;
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bk@work.mysql.com committed
3193
  default:					/* Impossible */
3194
    send_ok(thd);
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bk@work.mysql.com committed
3195 3196 3197 3198
    break;
  }
  thd->proc_info="query end";			// QQ
  if (res < 0)
3199
    send_error(thd,thd->killed ? ER_SERVER_SHUTDOWN : 0);
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bk@work.mysql.com committed
3200 3201 3202 3203 3204 3205

error:
  DBUG_VOID_RETURN;
}


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

3210
  SYNOPSIS
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3211 3212 3213 3214 3215 3216 3217 3218 3219 3220 3221
    single_table_command_access()
    thd - Thread handler
    privilege - asked privelage
    tables - table list of command
    res - pointer on result code variable

  RETURN
    0 - OK
    1 - access denied
*/

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3222
static bool single_table_command_access(THD *thd, ulong privilege,
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					TABLE_LIST *tables, int *res)
					 
{
    if (check_access(thd, privilege, tables->db, &tables->grant.privilege))
      return 1;

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

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


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3246
/****************************************************************************
3247
  Get the user (global) and database privileges for all used tables
3248 3249 3250 3251 3252 3253 3254 3255 3256 3257 3258 3259 3260

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

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

    save_priv	In this we store global and db level grants for the table
		Note that we don't store db level grants if the global grants
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                is enough to satisfy the request and the global grants contains
                a SELECT grant.
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3263 3264 3265
****************************************************************************/

bool
3266
check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
3267
	     bool dont_check_global_grants, bool no_errors)
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3268
{
3269 3270 3271 3272
  DBUG_ENTER("check_access");
  DBUG_PRINT("enter",("want_access: %lu  master_access: %lu", want_access,
		      thd->master_access));
  ulong db_access,dummy;
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  if (save_priv)
    *save_priv=0;
  else
    save_priv= &dummy;

3278
  if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
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3279
  {
3280
    if (!no_errors)
3281
      send_error(thd,ER_NO_DB_ERROR);	/* purecov: tested */
3282
    DBUG_RETURN(TRUE);				/* purecov: tested */
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  }

  if ((thd->master_access & want_access) == want_access)
  {
3287 3288 3289 3290 3291 3292 3293 3294 3295
    /*
      If we don't have a global SELECT privilege, we have to get the database
      specific access rights to be able to handle queries of type
      UPDATE t1 SET a=1 WHERE b > 0
    */
    db_access= thd->db_access;
    if (!(thd->master_access & SELECT_ACL) &&
	(db && (!thd->db || strcmp(db,thd->db))))
      db_access=acl_get(thd->host, thd->ip, (char*) &thd->remote.sin_addr,
3296
			thd->priv_user, db, test(want_access & GRANT_ACL));
3297
    *save_priv=thd->master_access | db_access;
3298
    DBUG_RETURN(FALSE);
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3299
  }
3300
  if (((want_access & ~thd->master_access) & ~(DB_ACLS | EXTRA_ACL)) ||
3301
      ! db && dont_check_global_grants)
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  {						// We can never grant this
3303
    if (!no_errors)
3304
      net_printf(thd,ER_ACCESS_DENIED_ERROR,
3305
		 thd->priv_user,
3306
		 thd->priv_host,
3307
		 thd->password ? ER(ER_YES) : ER(ER_NO));/* purecov: tested */
3308
    DBUG_RETURN(TRUE);				/* purecov: tested */
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  }

  if (db == any_db)
3312
    DBUG_RETURN(FALSE);				// Allow select on anything
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3313

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3314 3315
  if (db && (!thd->db || strcmp(db,thd->db)))
    db_access=acl_get(thd->host, thd->ip, (char*) &thd->remote.sin_addr,
3316
		      thd->priv_user, db, test(want_access & GRANT_ACL));
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  else
    db_access=thd->db_access;
3319 3320
  // Remove SHOW attribute and access rights we already have
  want_access &= ~(thd->master_access | EXTRA_ACL);
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  db_access= ((*save_priv=(db_access | thd->master_access)) & want_access);
3322 3323

  /* grant_option is set if there exists a single table or column grant */
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  if (db_access == want_access ||
3325 3326
      ((grant_option && !dont_check_global_grants) &&
       !(want_access & ~TABLE_ACLS)))
3327
    DBUG_RETURN(FALSE);				/* Ok */
3328
  if (!no_errors)
3329
    net_printf(thd,ER_DBACCESS_DENIED_ERROR,
3330
	       thd->priv_user,
3331
	       thd->priv_host,
3332
	       db ? db : thd->db ? thd->db : "unknown"); /* purecov: tested */
3333
  DBUG_RETURN(TRUE);				/* purecov: tested */
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}


3337 3338 3339 3340 3341 3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354
/*
  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
*/
3355 3356

bool check_global_access(THD *thd, ulong want_access)
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3357
{
3358
  char command[128];
3359
  if ((thd->master_access & want_access))
3360 3361
    return 0;
  get_privilege_desc(command, sizeof(command), want_access);
3362
  net_printf(thd,ER_SPECIFIC_ACCESS_DENIED_ERROR,
3363 3364
	     command);
  return 1;
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}


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/*
3369 3370
  Check the privilege for all used tables.  Table privileges are cached
  in the table list for GRANT checking
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*/

3373
bool
3374
check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables,
3375
		   bool no_errors)
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{
3377 3378
  uint found=0;
  ulong found_access=0;
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  TABLE_LIST *org_tables=tables;
  for (; tables ; tables=tables->next)
  {
3382
    if (tables->derived || (tables->table && (int)tables->table->tmp_table))
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      continue;
3384 3385
    if ((thd->master_access & want_access) == (want_access & ~EXTRA_ACL) &&
	thd->db)
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      tables->grant.privilege= want_access;
3387
    else if (tables->db && tables->db == thd->db)
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    {
      if (found && !grant_option)		// db already checked
	tables->grant.privilege=found_access;
      else
      {
3393 3394
	if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
			 0, no_errors))
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3395 3396
	  return TRUE;				// Access denied
	found_access=tables->grant.privilege;
3397
	found=1;
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3398 3399
      }
    }
3400
    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
3401
			  0, no_errors))
3402
      return TRUE;
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3403 3404
  }
  if (grant_option)
3405
    return check_grant(thd,want_access & ~EXTRA_ACL,org_tables,
3406
		       test(want_access & EXTRA_ACL), no_errors);
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  return FALSE;
}


3411
static bool check_db_used(THD *thd,TABLE_LIST *tables)
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{
  for (; tables ; tables=tables->next)
  {
    if (!tables->db)
    {
      if (!(tables->db=thd->db))
      {
3419
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: tested */
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	return TRUE;				/* purecov: tested */
      }
    }
  }
  return FALSE;
}


3428 3429
static bool check_merge_table_access(THD *thd, char *db,
				     TABLE_LIST *table_list)
3430 3431 3432 3433
{
  int error=0;
  if (table_list)
  {
3434
    /* Check that all tables use the current database */
3435 3436
    TABLE_LIST *tmp;
    for (tmp=table_list; tmp ; tmp=tmp->next)
3437 3438 3439 3440
    {
      if (!tmp->db || !tmp->db[0])
	tmp->db=db;
    }
3441 3442 3443 3444 3445 3446 3447
    error=check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
			     table_list);
  }
  return error;
}


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

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

3458
#ifndef EMBEDDED_LIBRARY
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bool check_stack_overrun(THD *thd,char *buf __attribute__((unused)))
{
  long stack_used;
  if ((stack_used=used_stack(thd->thread_stack,(char*) &stack_used)) >=
      (long) thread_stack_min)
  {
    sprintf(errbuff[0],ER(ER_STACK_OVERRUN),stack_used,thread_stack);
    my_message(ER_STACK_OVERRUN,errbuff[0],MYF(0));
3467
    thd->fatal_error();
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    return 1;
  }
  return 0;
}
3472
#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;
}


/****************************************************************************
3507
  Initialize global thd variables needed for query
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3508 3509
****************************************************************************/

3510
void
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3511 3512 3513
mysql_init_query(THD *thd)
{
  DBUG_ENTER("mysql_init_query");
3514 3515 3516
  LEX *lex=&thd->lex;
  lex->unit.init_query();
  lex->unit.init_select();
3517
  lex->unit.thd= thd;
3518 3519 3520
  lex->select_lex.init_query();
  lex->value_list.empty();
  lex->param_list.empty();
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3521 3522
  lex->unit.next= lex->unit.master= 
    lex->unit.link_next= lex->unit.return_to=0;
3523
  lex->unit.prev= lex->unit.link_prev= 0;
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3524
  lex->unit.slave= lex->unit.global_parameters= lex->current_select=
3525
    lex->all_selects_list= &lex->select_lex;
3526 3527
  lex->select_lex.master= &lex->unit;
  lex->select_lex.prev= &lex->unit.slave;
3528
  lex->select_lex.link_next= lex->select_lex.slave= lex->select_lex.next= 0;
3529
  lex->select_lex.link_prev= (st_select_lex_node**)&(lex->all_selects_list);
3530 3531
  lex->describe= 0;
  lex->derived_tables= FALSE;
3532 3533
  lex->lock_option= TL_READ;
  lex->found_colon= 0;
3534
  lex->safe_to_cache_query= 1;
3535
  thd->select_number= lex->select_lex.select_number= 1;
3536
  thd->free_list= 0;
3537
  thd->total_warn_count=0;			// Warnings for this query
3538 3539
  thd->last_insert_id_used= thd->query_start_used= thd->insert_id_used=0;
  thd->sent_row_count= thd->examined_row_count= 0;
3540
  thd->is_fatal_error= thd->rand_used= 0;
3541
  thd->server_status &= ~SERVER_MORE_RESULTS_EXISTS;
3542
  thd->tmp_table_used= 0;
3543 3544
  if (opt_bin_log)
    reset_dynamic(&thd->user_var_events);
3545
  thd->clear_error();
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3546 3547 3548
  DBUG_VOID_RETURN;
}

3549

3550 3551 3552
void
mysql_init_select(LEX *lex)
{
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3553
  SELECT_LEX *select_lex= lex->current_select;
3554
  select_lex->init_select();
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3555
  select_lex->select_limit= lex->thd->variables.select_limit;
3556 3557 3558 3559 3560 3561
  if (select_lex == &lex->select_lex)
  {
    lex->exchange= 0;
    lex->result= 0;
    lex->proc_list.first= 0;
  }
3562 3563
}

3564

3565
bool
3566
mysql_new_select(LEX *lex, bool move_down)
3567
{
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3568
  SELECT_LEX *select_lex = new(&lex->thd->mem_root) SELECT_LEX();
3569 3570
  if (!select_lex)
    return 1;
3571
  select_lex->select_number= ++lex->thd->select_number;
3572 3573 3574 3575 3576
  select_lex->init_query();
  select_lex->init_select();
  if (move_down)
  {
    /* first select_lex of subselect or derived table */
3577
    SELECT_LEX_UNIT *unit= new(&lex->thd->mem_root) SELECT_LEX_UNIT();
3578 3579 3580 3581
    if (!unit)
      return 1;
    unit->init_query();
    unit->init_select();
3582
    unit->thd= lex->thd;
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3583
    unit->include_down(lex->current_select);
3584 3585
    unit->link_next= 0;
    unit->link_prev= 0;
3586
    unit->return_to= lex->current_select;
3587
    select_lex->include_down(unit);
3588
    // TODO: assign resolve_mode for fake subquery after merging with new tree
3589 3590
  }
  else
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3591
  {
3592
    select_lex->include_neighbour(lex->current_select);
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3593 3594 3595 3596 3597 3598 3599 3600
    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
      */
3601
      fake= unit->fake_select_lex= new(&lex->thd->mem_root) SELECT_LEX();
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      fake->include_standalone(unit,
			       (SELECT_LEX_NODE**)&unit->fake_select_lex);
      fake->select_number= INT_MAX;
      fake->make_empty_select();
      fake->linkage= GLOBAL_OPTIONS_TYPE;
      fake->select_limit= lex->thd->variables.select_limit;
    }
  }
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3610

3611
  select_lex->master_unit()->global_parameters= select_lex;
3612
  select_lex->include_global((st_select_lex_node**)&lex->all_selects_list);
3613
  lex->current_select= select_lex;
3614
  select_lex->resolve_mode= SELECT_LEX::SELECT_MODE;
3615
  return 0;
3616
}
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3617

3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632
/*
  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)
{
3633
  THD *thd;
3634
  LEX *lex;
3635
  LEX_STRING tmp, null_lex_string;
3636
  DBUG_ENTER("create_select_for_variable");
3637 3638 3639

  thd= current_thd;
  lex= &thd->lex;
3640 3641 3642 3643
  mysql_init_select(lex);
  lex->sql_command= SQLCOM_SELECT;
  tmp.str= (char*) var_name;
  tmp.length=strlen(var_name);
3644 3645 3646
  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));
3647 3648 3649
  DBUG_VOID_RETURN;
}

3650

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3651 3652
void mysql_init_multi_delete(LEX *lex)
{
3653
  lex->sql_command=  SQLCOM_DELETE_MULTI;
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3654
  mysql_init_select(lex);
3655
  lex->select_lex.select_limit= lex->unit.select_limit_cnt=
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3656
    HA_POS_ERROR;
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3657
  lex->select_lex.table_list.save_and_clear(&lex->auxilliary_table_list);
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3658
}
3659

3660

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3661
void
3662
mysql_parse(THD *thd, char *inBuf, uint length)
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{
  DBUG_ENTER("mysql_parse");

  mysql_init_query(thd);
3667
  if (query_cache_send_result_to_client(thd, inBuf, length) <= 0)
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3668 3669
  {
    LEX *lex=lex_start(thd, (uchar*) inBuf, length);
3670
    if (!yyparse((void *)thd) && ! thd->is_fatal_error)
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3671
    {
3672
      if (mqh_used && thd->user_connect &&
3673
	  check_mqh(thd, lex->sql_command))
3674 3675 3676 3677 3678
      {
	thd->net.error = 0;
      }
      else
      {
3679 3680 3681 3682 3683
	if (thd->net.report_error)
	  send_error(thd, 0, NullS);
	else
	{
	  mysql_execute_command(thd);
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#ifndef EMBEDDED_LIBRARY  /* TODO query cache in embedded library*/
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	  query_cache_end_of_result(&thd->net);
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#endif
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	}
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      }
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    }
    else
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    {
      DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
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			 thd->is_fatal_error));
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#ifndef EMBEDDED_LIBRARY   /* TODO query cache in embedded library*/
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      query_cache_abort(&thd->net);
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#endif
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    }
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    thd->proc_info="freeing items";
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    free_items(thd->free_list);  /* Free strings used by items */
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    lex_end(lex);
  }
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  DBUG_VOID_RETURN;
}


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

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bool add_field_to_list(THD *thd, char *field_name, enum_field_types type,
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		       char *length, char *decimals,
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		       uint type_modifier,
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		       Item *default_value, LEX_STRING *comment,
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		       char *change, TYPELIB *interval, CHARSET_INFO *cs,
		       uint uint_geom_type)
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{
  register create_field *new_field;
  LEX  *lex= &thd->lex;
  uint allowed_type_modifier=0;
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  char warn_buff[MYSQL_ERRMSG_SIZE];
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  DBUG_ENTER("add_field_to_list");

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

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  if (default_value)
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  {
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    if (default_value->type() == Item::NULL_ITEM)
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    {
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      default_value=0;
      if ((type_modifier & (NOT_NULL_FLAG | AUTO_INCREMENT_FLAG)) ==
	  NOT_NULL_FLAG)
      {
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	net_printf(thd,ER_INVALID_DEFAULT,field_name);
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	DBUG_RETURN(1);
      }
    }
    else if (type_modifier & AUTO_INCREMENT_FLAG)
    {
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      net_printf(thd, ER_INVALID_DEFAULT, field_name);
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      DBUG_RETURN(1);
    }
  }
  if (!(new_field=new create_field()))
    DBUG_RETURN(1);
  new_field->field=0;
  new_field->field_name=field_name;
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  new_field->def= default_value;
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  new_field->flags= type_modifier;
  new_field->unireg_check= (type_modifier & AUTO_INCREMENT_FLAG ?
			    Field::NEXT_NUMBER : Field::NONE);
  new_field->decimals= decimals ? (uint) set_zone(atoi(decimals),0,
						  NOT_FIXED_DEC-1) : 0;
  new_field->sql_type=type;
  new_field->length=0;
  new_field->change=change;
  new_field->interval=0;
  new_field->pack_length=0;
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  new_field->charset=cs;
3778
  new_field->geom_type= (Field::geometry_type) uint_geom_type;
3779

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  if (!comment)
  {
    new_field->comment.str=0;
    new_field->comment.length=0;
  }
  else
  {
    /* In this case comment is always of type Item_string */
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    new_field->comment.str=   (char*) comment->str;
    new_field->comment.length=comment->length;
3790
  }
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  if (length && !(new_field->length= (uint) atoi(length)))
    length=0; /* purecov: inspected */
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  uint sign_len=type_modifier & UNSIGNED_FLAG ? 0 : 1;

  if (new_field->length && new_field->decimals &&
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      new_field->length < new_field->decimals+1 &&
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      new_field->decimals != NOT_FIXED_DEC)
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    new_field->length=new_field->decimals+1; /* purecov: inspected */
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  switch (type) {
  case FIELD_TYPE_TINY:
    if (!length) new_field->length=3+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_SHORT:
    if (!length) new_field->length=5+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_INT24:
    if (!length) new_field->length=8+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_LONG:
    if (!length) new_field->length=10+sign_len;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_LONGLONG:
    if (!length) new_field->length=20;
    allowed_type_modifier= AUTO_INCREMENT_FLAG;
    break;
  case FIELD_TYPE_NULL:
    break;
  case FIELD_TYPE_DECIMAL:
    if (!length)
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      new_field->length= 10;			// Default length for DECIMAL
    if (new_field->length < MAX_FIELD_WIDTH)	// Skip wrong argument
    {
      new_field->length+=sign_len;
      if (new_field->decimals)
	new_field->length++;
    }
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    break;
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  case FIELD_TYPE_STRING:
  case FIELD_TYPE_VAR_STRING:
3835
    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",
3840
	    (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:
3848
  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)
      {
3943
	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++)
3952 3953 3954
      {
	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)
      {
3959 3960
	char *not_used;
	uint not_used2;
3961
  bool not_used3;
3962

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	thd->cuted_fields=0;
	String str,*res;
	res=default_value->val_str(&str);
3966
	(void) find_set(interval, res->ptr(), res->length(), &not_used,
3967
			&not_used2, &not_used3);
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	if (thd->cuted_fields)
	{
3970
	  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
3980
      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)
  {
4014
    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
4060
  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;
4140
  if (check_table_name(table->table.str,table->table.length) ||
4141
      table->db.str && check_db_name(table->db.str))
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  {
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    net_printf(thd,ER_WRONG_TABLE_NAME,table->table.str);
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    DBUG_RETURN(0);
  }

  if (!alias)					/* Alias is case sensitive */
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  {
    if (table->sel)
    {
      net_printf(thd,ER_DERIVED_MUST_HAVE_ALIAS);
      DBUG_RETURN(0);
    }
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    if (!(alias_str=thd->memdup(alias_str,table->table.length+1)))
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      DBUG_RETURN(0);
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  }
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  if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
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    DBUG_RETURN(0);				/* purecov: inspected */
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4159
  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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4175

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  ptr->alias= alias_str;
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  if (lower_case_table_names && table->table.length)
    my_casedn_str(files_charset_info, table->table.str);
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  ptr->real_name=table->table.str;
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  ptr->real_name_length=table->table.length;
4181
  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);
4185
  ptr->derived=	    table->sel;
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  if (use_index)
4187
    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 */
4194
  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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4211

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/*
  Set lock for all tables in current select level

  SYNOPSIS:
    set_lock_for_tables()
    lock_type			Lock to set for tables

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

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

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

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4242

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void add_join_on(TABLE_LIST *b,Item *expr)
{
4245
  if (expr)
4246
  {
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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();
4255
  }
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}


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/*
  Mark that we have a NATURAL JOIN between two tables

  SYNOPSIS
    add_join_natural()
    a			Table to do normal join with
    b			Do normal join with this table
  
  IMPLEMENTATION
    This function just marks that table b should be joined with a.
    The function setup_cond() will create in b->on_expr a list
    of equal condition between all fields of the same name.

    SELECT * FROM t1 NATURAL LEFT JOIN t2
     <=>
    SELECT * FROM t1 LEFT JOIN t2 ON (t1.i=t2.i and t1.j=t2.j ... )
*/

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

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/*
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  Reload/resets privileges and the different caches.

  SYNOPSIS
    reload_acl_and_cache()
    thd			Thread handler
    options             What should be reset/reloaded (tables, privileges,
    slave...)
    tables              Tables to flush (if any)
    write_to_binlog     Depending on 'options', it may be very bad to write the
                        query to the binlog (e.g. FLUSH SLAVE); this is a
                        pointer where, if it is not NULL, reload_acl_and_cache()
                        will put 0 if it thinks we really should not write to
                        the binlog. Otherwise it will put 1.

  RETURN
    0	 ok
    !=0  error
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*/

4303 4304
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 */
4308
  bool tmp_write_to_binlog= 1;
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  if (options & REFRESH_GRANT)
  {
4311
    acl_reload(thd);
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    grant_reload(thd);
4313
    if (mqh_used)
4314
      reset_mqh(thd,(LEX_USER *) NULL,true);
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  }
  if (options & REFRESH_LOG)
  {
4318
    /*
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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);
4333
#ifdef HAVE_REPLICATION
4334
    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);
4339
    }
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    LOCK_ACTIVE_MI;
    rotate_relay_log(active_mi);
    UNLOCK_ACTIVE_MI;
4343
#endif
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4344 4345
    if (ha_flush_logs())
      result=1;
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    if (flush_error_log())
      result=1;
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  }
4349
#ifdef HAVE_QUERY_CACHE
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  if (options & REFRESH_QUERY_CACHE_FREE)
  {
4352
    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))
  {
4357
    query_cache.flush();			// RESET QUERY CACHE
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  }
4359
#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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  {
4366
    if ((options & REFRESH_READ_LOCK) && thd)
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    {
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      // writing to the binlog could cause deadlocks, as we don't log UNLOCK TABLES
      tmp_write_to_binlog= 0;
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      if (lock_global_read_lock(thd))
	return 1;
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    }
4373
    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();
4381
#ifdef HAVE_REPLICATION
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4382
  if (options & REFRESH_MASTER)
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  {
    tmp_write_to_binlog= 0;
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    if (reset_master(thd))
      result=1;
4387
  }
4388
#endif
4389
#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
4396
#ifdef HAVE_REPLICATION
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 if (options & REFRESH_SLAVE)
 {
4399
   tmp_write_to_binlog= 0;
4400
   LOCK_ACTIVE_MI;
4401
   if (reset_slave(thd, active_mi))
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     result=1;
   UNLOCK_ACTIVE_MI;
 }
4405
#endif
4406
 if (options & REFRESH_USER_RESOURCES)
4407
   reset_mqh(thd,(LEX_USER *) NULL);
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 if (write_to_binlog)
   *write_to_binlog= tmp_write_to_binlog;
4410
 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
*/

4426
void kill_one_thread(THD *thd, ulong id)
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{
  THD *tmp;
  uint error=ER_NO_SUCH_THREAD;
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  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For unlink from list
  I_List_iterator<THD> it(threads);
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  while ((tmp=it++))
  {
    if (tmp->thread_id == id)
    {
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      pthread_mutex_lock(&tmp->LOCK_delete);	// Lock from delete
      break;
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    }
  }
  VOID(pthread_mutex_unlock(&LOCK_thread_count));
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  if (tmp)
  {
    if ((thd->master_access & SUPER_ACL) ||
	!strcmp(thd->user,tmp->user))
    {
      tmp->awake(1 /*prepare to die*/);
      error=0;
    }
    else
      error=ER_KILL_DENIED_ERROR;
    pthread_mutex_unlock(&tmp->LOCK_delete);
  }

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4454
  if (!error)
4455
    send_ok(thd);
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  else
4457
    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 */

4478
static bool append_file_to_dir(THD *thd, char **filename_ptr, char *table_name)
4479
{
4480
  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);
4493
  end=convert_dirname(buff, *filename_ptr, NullS);
4494
  if (!(ptr=thd->alloc((uint) (end-buff)+(uint) strlen(table_name)+1)))
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    return 1;					// End of memory
  *filename_ptr=ptr;
4497
  strxmov(ptr,buff,table_name,NullS);
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  return 0;
}
4500

4501

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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;
4516
  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));
4521
    net_printf(thd, ER_CANT_USE_OPTION_HERE, command);
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    return 1;
  }
  return 0;
}
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compare_func_creator comp_eq_creator(bool invert)
{
  return invert?&Item_bool_func2::ne_creator:&Item_bool_func2::eq_creator;
}

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

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

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

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

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