sql_parse.cc 132 KB
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/* Copyright (C) 2000-2003 MySQL AB
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   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

#include "mysql_priv.h"
#include "sql_acl.h"
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#include "sql_repl.h"
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#include "repl_failsafe.h"
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#include <m_ctype.h>
#include <myisam.h>
#include <my_dir.h>

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#ifdef HAVE_INNOBASE_DB
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#include "ha_innodb.h"
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#endif

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#ifdef HAVE_OPENSSL
/*
  Without SSL the handshake consists of one packet. This packet
  has both client capabilites and scrambled password.
  With SSL the handshake might consist of two packets. If the first
  packet (client capabilities) has CLIENT_SSL flag set, we have to
  switch to SSL and read the second packet. The scrambled password
  is in the second packet and client_capabilites field will be ignored.
  Maybe it is better to accept flags other than CLIENT_SSL from the
  second packet?
*/
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#define SSL_HANDSHAKE_SIZE      2
#define NORMAL_HANDSHAKE_SIZE   6
#define MIN_HANDSHAKE_SIZE      2
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#else
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#define MIN_HANDSHAKE_SIZE      6
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#endif /* HAVE_OPENSSL */
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extern "C" pthread_mutex_t THR_LOCK_keycache;
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#ifdef SOLARIS
extern "C" int gethostname(char *name, int namelen);
#endif
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static int check_for_max_user_connections(THD *thd, USER_CONN *uc);
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static void decrease_user_connections(USER_CONN *uc);
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static bool check_db_used(THD *thd,TABLE_LIST *tables);
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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static bool check_merge_table_access(THD *thd, char *db, TABLE_LIST *tables);
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static bool single_table_command_access(THD *thd, ulong privilege,
					TABLE_LIST *tables, int *res);
#else
#define check_merge_table_access(thd, db, tables) false
#define single_table_command_access(thd, privilege, tables, res) false
#endif
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static void remove_escape(char *name);
static void refresh_status(void);
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static bool append_file_to_dir(THD *thd, char **filename_ptr,
			       char *table_name);
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const char *any_db="*any*";	// Special symbol for check_access
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const char *command_name[]={
  "Sleep", "Quit", "Init DB", "Query", "Field List", "Create DB",
  "Drop DB", "Refresh", "Shutdown", "Statistics", "Processlist",
  "Connect","Kill","Debug","Ping","Time","Delayed_insert","Change user",
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  "Binlog Dump","Table Dump",  "Connect Out", "Register Slave",
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  "Prepare", "Prepare Execute", "Long Data", "Close stmt",
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  "Error"					// Last command number
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};

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

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

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


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static HASH hash_user_connections;

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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 NO_EMBEDDED_ACCESS_CHECKS
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/*
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    Check if user exist and password supplied is correct. 
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  SYNOPSIS
    check_user()
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    thd          thread handle, thd->{host,user,ip} are used
    command      originator of the check: now check_user is called
                 during connect and change user procedures; used for 
                 logging.
    passwd       scrambled password recieved from client
    passwd_len   length of scrambled password
    db           database name to connect to, may be NULL
    check_count  dont know exactly

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

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

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

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

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

      /* Don't allow user to connect if he has done too many queries */
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      if ((ur.questions || ur.updates ||
           ur.connections || max_user_connections) &&
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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 /*!NO_EMBEDDED_ACCESS_CHECKS*/
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/*
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  Check for maximum allowable user connections, if the mysqld server is
  started with corresponding variable that is greater then 0.
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*/

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

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

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


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static int check_for_max_user_connections(THD *thd, USER_CONN *uc)
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{
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  int error=0;
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  DBUG_ENTER("check_for_max_user_connections");
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  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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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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/*
  Check if maximum queries per hour limit has been reached
  returns 0 if OK.
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  In theory we would need a mutex in the USER_CONN structure for this to
  be 100 % safe, but as the worst scenario is that we would miss counting
  a couple of queries, this isn't critical.
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*/

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

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

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

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    memcpy(temp_user,lu->user.str,lu->user.length);
    memcpy(temp_user+lu->user.length+1,lu->host.str,lu->host.length);
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    temp_user[lu->user.length]='\0'; temp_user[temp_len-1]=0;
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    if ((uc = (struct  user_conn *) hash_search(&hash_user_connections,
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						(byte*) temp_user, temp_len)))
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    {
      uc->questions=0;
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      get_mqh(temp_user,&temp_user[lu->user.length+1],uc);
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      uc->updates=0;
      uc->conn_per_hour=0;
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    }
  }
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  else // for FLUSH PRIVILEGES and FLUSH USER_RESOURCES
548
  {
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    for (uint idx=0;idx < hash_user_connections.records; idx++)
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    {
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      USER_CONN *uc=(struct user_conn *) hash_element(&hash_user_connections, idx);
      if (get_them)
	get_mqh(uc->user,uc->host,uc);
      uc->questions=0;
      uc->updates=0;
      uc->conn_per_hour=0;
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    }
  }
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  (void) pthread_mutex_unlock(&LOCK_user_conn);
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}
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#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/
562

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/*
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    Perform handshake, authorize client and update thd ACL variables.
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  SYNOPSIS
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    check_connection()
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    thd  thread handle
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  RETURN
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     0  success, OK is sent to user, thd is updated.
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    -1  error, which is sent to user
   > 0  error code (not sent to user)
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*/

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

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  if (!thd->host)                           // If TCP/IP connection
  {
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    char ip[30];
587

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    if (vio_peer_addr(net->vio, ip, &thd->peer_port))
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      return (ER_BAD_HOST_ERROR);
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    if (!(thd->ip= my_strdup(ip,MYF(0))))
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      return (ER_OUT_OF_RESOURCES);
592
    thd->host_or_ip= thd->ip;
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#if !defined(HAVE_SYS_UN_H) || defined(HAVE_mit_thread)
    /* Fast local hostname resolve for Win32 */
    if (!strcmp(thd->ip,"127.0.0.1"))
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    {
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      thd->host= (char*) my_localhost;
      thd->host_or_ip= my_localhost;
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    }
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    else
#endif
    {
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      if (!(specialflag & SPECIAL_NO_RESOLVE))
      {
	vio_in_addr(net->vio,&thd->remote.sin_addr);
	thd->host=ip_to_hostname(&thd->remote.sin_addr,&connect_errors);
	/* Cut very long hostnames to avoid possible overflows */
	if (thd->host)
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	{
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	  thd->host[min(strlen(thd->host), HOSTNAME_LENGTH)]= 0;
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	  thd->host_or_ip= thd->host;
	}
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	if (connect_errors > max_connect_errors)
	  return(ER_HOST_IS_BLOCKED);
      }
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    }
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    DBUG_PRINT("info",("Host: %s  ip: %s",
		       thd->host ? thd->host : "unknown host",
		       thd->ip ? thd->ip : "unknown ip"));
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    if (acl_check_host(thd->host,thd->ip))
      return(ER_HOST_NOT_PRIVILEGED);
  }
623
  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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634
    /* 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);
690
  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
    */
716
    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))
721
    {
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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;
  }

744
  if (thd->client_capabilities & CLIENT_IGNORE_SPACE)
745
    thd->variables.sql_mode|= MODE_IGNORE_SPACE;
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#ifdef HAVE_OPENSSL
747
  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);
763
    }
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    DBUG_PRINT("info", ("Reading user information over SSL layer"));
765
    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)
783
    thd->variables.net_wait_timeout= thd->variables.net_interactive_timeout;
784
  if ((thd->client_capabilities & CLIENT_TRANSACTIONS) &&
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      opt_using_transactions)
    net->return_status= &thd->server_status;
787
  net->read_timeout=(uint) thd->variables.net_read_timeout;
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  char *user= end;
  char *passwd= strend(user)+1;
791
  char *db= passwd;
792
  char db_buff[NAME_LEN+1];                     // buffer to store db in utf8 
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  /* 
    Old clients send null-terminated string as password; new clients send
    the size (1 byte) + string (not null-terminated). Hence in case of empty
    password both send '\0'.
  */
  uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ? 
    *passwd++ : strlen(passwd);
  db= thd->client_capabilities & CLIENT_CONNECT_WITH_DB ?
    db + passwd_len + 1 : 0;
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  /* Since 4.1 all database names are stored in utf8 */
  if (db)
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  {
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    db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
                             system_charset_info,
                             db, strlen(db),
                             thd->charset())]= 0;
810
    db= db_buff;
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  }
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  if (thd->user)
    x_free(thd->user);
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  if (!(thd->user= my_strdup(user, MYF(0))))
    return (ER_OUT_OF_RESOURCES);
817
  return check_user(thd, COM_CONNECT, passwd, passwd_len, db, true);
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}

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

  pthread_detach_this_thread();

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

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

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#if defined(__WIN__)
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  init_signals();				// IRENA; testing ?
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#elif !defined(OS2) && !defined(__NETWARE__)
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  sigset_t set;
  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
#endif
  if (thd->store_globals())
  {
861
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
862
    statistic_increment(aborted_connects,&LOCK_status);
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    end_thread(thd,0);
    return 0;
  }

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

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

892
    thd->proc_info=0;				// Remove 'login'
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    thd->command=COM_SLEEP;
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    thd->version=refresh_version;
    thd->set_time();
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    thd->init_for_queries();
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    while (!net->error && net->vio != 0 && !thd->killed)
    {
      if (do_command(thd))
	break;
    }
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    if (thd->user_connect)
      decrease_user_connections(thd->user_connect);
904
    free_root(&thd->mem_root,MYF(0));
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    if (net->error && net->vio != 0 && net->report_error)
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    {
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      if (!thd->killed && thd->variables.log_warnings)
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	sql_print_error(ER(ER_NEW_ABORTING_CONNECTION),
			thd->thread_id,(thd->db ? thd->db : "unconnected"),
			thd->user ? thd->user : "unauthenticated",
			thd->host_or_ip,
			(net->last_errno ? ER(net->last_errno) :
			 ER(ER_UNKNOWN_ERROR)));
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      send_error(thd,net->last_errno,NullS);
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      statistic_increment(aborted_threads,&LOCK_status);
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    }
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    else if (thd->killed)
    {
      statistic_increment(aborted_threads,&LOCK_status);
    }
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end_thread:
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    close_connection(thd, 0, 1);
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    end_thread(thd,1);
    /*
      If end_thread returns, we are either running with --one-thread
      or this thread has been schedule to handle the next query
    */
    thd= current_thd;
  } while (!(test_flags & TEST_NO_THREADS));
  /* The following is only executed if we are not using --one-thread */
  return(0);					/* purecov: deadcode */
}

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#endif /* EMBEDDED_LIBRARY */

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/*
  Execute commands from bootstrap_file.
  Used when creating the initial grant tables
*/
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942
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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947

948
  /* The following must be called before DBUG_ENTER */
949
  if (my_thread_init() || thd->store_globals())
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950
  {
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951
#ifndef EMBEDDED_LIBRARY
952
    close_connection(thd, ER_OUT_OF_RESOURCES, 1);
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#endif
954
    thd->fatal_error();
955
    goto end;
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956
  }
957 958
  DBUG_ENTER("handle_bootstrap");

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959
#ifndef EMBEDDED_LIBRARY
960 961
  pthread_detach_this_thread();
  thd->thread_stack= (char*) &thd;
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962
#if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__)
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  sigset_t set;
964 965
  VOID(sigemptyset(&set));			// Get mask in use
  VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
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#endif
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#endif /* EMBEDDED_LIBRARY */
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968

969
  if (thd->variables.max_join_size == HA_POS_ERROR)
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970 971 972 973
    thd->options |= OPTION_BIG_SELECTS;

  thd->proc_info=0;
  thd->version=refresh_version;
974
  thd->priv_user=thd->user=(char*) my_strdup("boot", MYF(MY_WME));
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975

976
  buff= (char*) thd->net.buff;
977
  thd->init_for_queries();
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978 979
  while (fgets(buff, thd->net.max_packet, file))
  {
980
    uint length=(uint) strlen(buff);
981
    while (length && (my_isspace(thd->charset(), buff[length-1]) ||
982
           buff[length-1] == ';'))
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983 984
      length--;
    buff[length]=0;
985
    thd->query_length=length;
986 987
    thd->query= thd->memdup_w_gap(buff, length+1, thd->db_length+1);
    thd->query[length] = '\0';
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988
    thd->query_id=query_id++;
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989
#ifndef NO_EMBEDDED_ACCESS_CHECKS
990
    if (mqh_used && thd->user_connect && check_mqh(thd, SQLCOM_END))
991 992 993 994 995 996
    {
      thd->net.error = 0;
      close_thread_tables(thd);			// Free tables
      free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
      break;
    }
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#endif
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998 999
    mysql_parse(thd,thd->query,length);
    close_thread_tables(thd);			// Free tables
1000
    if (thd->is_fatal_error)
1001
      break;
1002
    free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
1003
    free_root(&thd->transaction.mem_root,MYF(MY_KEEP_PREALLOC));
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1004
  }
1005 1006 1007

  /* thd->fatal_error should be set in case something went wrong */
end:
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1008
#ifndef EMBEDDED_LIBRARY
1009 1010 1011
  (void) pthread_mutex_lock(&LOCK_thread_count);
  thread_count--;
  (void) pthread_mutex_unlock(&LOCK_thread_count);
1012
  (void) pthread_cond_broadcast(&COND_thread_count);
1013 1014
  my_thread_end();
  pthread_exit(0);
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1015
#endif
1016
  DBUG_RETURN(0);				// Never reached
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1017 1018
}

1019
    /* This works because items are allocated with sql_alloc() */
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1020

1021
void free_items(Item *item)
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1022
{
1023
  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;
1034
  if (!(table_list = (TABLE_LIST*) thd->calloc(sizeof(TABLE_LIST))))
1035
    DBUG_RETURN(1); // out of memory
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1036
  table_list->db = db;
1037
  table_list->real_name = table_list->alias = tbl_name;
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1038 1039 1040
  table_list->lock_type = TL_READ_NO_INSERT;
  table_list->next = 0;

1041 1042
  if (!db || check_db_name(db))
  {
1043
    net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
1044 1045
    goto err;
  }
1046
  if (lower_case_table_names)
1047
    my_casedn_str(files_charset_info, tbl_name);
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1048
  remove_escape(table_list->real_name);
1049 1050 1051 1052

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

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1053 1054
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  if (check_access(thd, SELECT_ACL, db, &table_list->grant.privilege,0,0))
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1055
    goto err;
1056
  if (grant_option && check_grant(thd, SELECT_ACL, table_list))
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1057
    goto err;
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1058
#endif
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1059
  thd->free_list = 0;
1060
  thd->query_length=(uint) strlen(tbl_name);
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1061
  thd->query = tbl_name;
1062 1063
  if ((error = mysqld_dump_create_info(thd, table, -1)))
  {
1064
    my_error(ER_GET_ERRNO, MYF(0), my_errno);
1065 1066
    goto err;
  }
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1067
  net_flush(&thd->net);
1068
  if ((error= table->file->dump(thd,fd)))
1069
    my_error(ER_GET_ERRNO, MYF(0));
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1070

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1071 1072
err:
  close_thread_tables(thd);
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  DBUG_RETURN(error);
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1074 1075 1076
}


1077
	/* Execute one command from socket (query or simple command) */
1078 1079

#ifndef EMBEDDED_LIBRARY
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1080 1081 1082
bool do_command(THD *thd)
{
  char *packet;
1083 1084
  uint old_timeout;
  ulong packet_length;
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1085 1086 1087 1088 1089
  NET *net;
  enum enum_server_command command;
  DBUG_ENTER("do_command");

  net= &thd->net;
1090 1091 1092 1093 1094
  /*
    indicator of uninitialized lex => normal flow of errors handling
    (see my_message_sql)
  */
  thd->lex.current_select= 0;
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1095 1096

  packet=0;
1097 1098 1099
  old_timeout=net->read_timeout;
  // Wait max for 8 hours
  net->read_timeout=(uint) thd->variables.net_wait_timeout;
1100
  thd->clear_error();				// Clear error message
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  net_new_transaction(net);
  if ((packet_length=my_net_read(net)) == packet_error)
  {
1105 1106 1107 1108 1109
    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)
1110 1111
    {
      statistic_increment(aborted_threads,&LOCK_status);
1112
      DBUG_RETURN(TRUE);			// We have to close it.
1113
    }
1114
    send_error(thd,net->last_errno,NullS);
1115
    net->error= 0;
1116
    DBUG_RETURN(FALSE);
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1117 1118 1119 1120 1121
  }
  else
  {
    packet=(char*) net->read_pos;
    command = (enum enum_server_command) (uchar) packet[0];
1122 1123
    if (command >= COM_END)
      command= COM_END;				// Wrong command
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1124 1125 1126
    DBUG_PRINT("info",("Command on %s = %d (%s)",
		       vio_description(net->vio), command,
		       command_name[command]));
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1127
  }
1128
  net->read_timeout=old_timeout;		// restore it
1129
  DBUG_RETURN(dispatch_command(command,thd, packet+1, (uint) packet_length));
1130
}
1131
#endif  /* EMBEDDED_LIBRARY */
1132

1133

1134 1135 1136 1137
bool dispatch_command(enum enum_server_command command, THD *thd,
		      char* packet, uint packet_length)
{
  NET *net= &thd->net;
1138
  bool error= 0;
1139 1140 1141 1142
  /*
    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
  */
1143 1144 1145
  bool slow_command=FALSE;
  DBUG_ENTER("dispatch_command");

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1146
  thd->command=command;
1147
  thd->set_time();
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1148 1149 1150 1151 1152 1153
  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));
1154

1155
  thd->lex.select_lex.options=0;		// We store status here
1156
  switch (command) {
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1157
  case COM_INIT_DB:
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1158 1159 1160 1161 1162 1163 1164 1165 1166
  {
    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;
  }
1167
#ifdef HAVE_REPLICATION
1168 1169
  case COM_REGISTER_SLAVE:
  {
1170
    if (!register_slave(thd, (uchar*)packet, packet_length))
1171
      send_ok(thd);
1172 1173
    break;
  }
1174
#endif
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1175
  case COM_TABLE_DUMP:
1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189
  {
    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;
  }
1190
#ifndef EMBEDDED_LIBRARY
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1191 1192
  case COM_CHANGE_USER:
  {
1193
    thd->change_user();
1194
    thd->clear_error();                         // if errors from rollback
1195

1196 1197
    statistic_increment(com_other, &LOCK_status);
    char *user= (char*) packet;
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    char *passwd= strend(user)+1;
1199 1200 1201 1202 1203
    /* 
      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).
    */
1204
    char db_buff[NAME_LEN+1];                 // buffer to store db in utf8 
1205 1206 1207 1208
    char *db= passwd;
    uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ? 
      *passwd++ : strlen(passwd);
    db+= passwd_len + 1;
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1209
    /* Small check for incomming packet */
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1210
    if ((uint) ((uchar*) db - net->read_pos) > packet_length)
1211 1212 1213 1214
    {
      send_error(thd, ER_UNKNOWN_COM_ERROR);
      break;
    }
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1215

1216
    /* Convert database name to utf8 */
1217 1218 1219 1220
    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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1221

1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236
    /* 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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1237

1238
    int res= check_user(thd, COM_CHANGE_USER, passwd, passwd_len, db, false);
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1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260
    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;
  }
1263
#endif /* EMBEDDED_LIBRARY */
1264 1265
  case COM_EXECUTE:
  {
1266
    mysql_stmt_execute(thd, packet);
1267 1268 1269 1270
    break;
  }
  case COM_LONG_DATA:
  {
1271
    mysql_stmt_get_longdata(thd, packet, packet_length);
1272 1273 1274 1275
    break;
  }
  case COM_PREPARE:
  {
1276
    mysql_stmt_prepare(thd, packet, packet_length);
1277 1278
    break;
  }
1279 1280 1281 1282 1283
  case COM_CLOSE_STMT:
  {
    mysql_stmt_free(thd, packet);
    break;
  }
1284 1285 1286 1287 1288
  case COM_RESET_STMT:
  {
    mysql_stmt_reset(thd, packet);
    break;
  }
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1289 1290
  case COM_QUERY:
  {
1291 1292
    if (alloc_query(thd, packet, packet_length))
      break;					// fatal error is set
1293
    mysql_log.write(thd,command,"%s",thd->query);
1294
    DBUG_PRINT("query",("%-.4096s",thd->query));
1295
    mysql_parse(thd,thd->query, thd->query_length);
1296

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1297
    while (!thd->killed && !thd->is_fatal_error && thd->lex.found_colon)
1298
    {
1299
      char *packet= thd->lex.found_colon;
1300 1301 1302 1303 1304 1305
      /* 
        Multiple queries exits, execute them individually
      */
      if (thd->lock || thd->open_tables || thd->derived_tables)
        close_thread_tables(thd);		

1306
      ulong length= thd->query_length-(ulong)(thd->lex.found_colon-thd->query);
1307 1308
      
      /* Remove garbage at start of query */
1309
      while (my_isspace(thd->charset(), *packet) && length > 0)
1310 1311 1312 1313 1314
      {
        packet++;
        length--;
      }
      thd->query_length= length;
1315 1316 1317 1318
      thd->query= packet;
      VOID(pthread_mutex_lock(&LOCK_thread_count));
      thd->query_id= query_id++;
      VOID(pthread_mutex_unlock(&LOCK_thread_count));
1319 1320 1321
      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;
  }
1327
  case COM_FIELD_LIST:				// This isn't actually needed
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1328
#ifdef DONT_ALLOW_SHOW_COMMANDS
1329
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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    break;
#else
  {
1333
    char *fields, *pend;
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1334
    TABLE_LIST table_list;
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    LEX_STRING conv_name;

1337
    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))
    {
1341
      send_error(thd,ER_NO_DB_ERROR);
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      break;
    }
    thd->free_list=0;
1345
    pend= strend(packet);
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1346 1347 1348
    thd->convert_string(&conv_name, system_charset_info,
			packet, (uint) (pend-packet), thd->charset());
    table_list.alias= table_list.real_name= conv_name.str;
1349
    packet= pend+1;
1350
    // command not cachable => no gap for data base name
1351 1352
    if (!(thd->query=fields=thd->memdup(packet,thd->query_length+1)))
      break;
1353
    mysql_log.write(thd,command,"%s %s",table_list.real_name,fields);
1354
    if (lower_case_table_names)
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1355
      my_casedn_str(files_charset_info, table_list.real_name);
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1356 1357
    remove_escape(table_list.real_name);	// This can't have wildcards

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1358 1359
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,SELECT_ACL,table_list.db,&thd->col_access,0,0))
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      break;
    table_list.grant.privilege=thd->col_access;
    if (grant_option && check_grant(thd,SELECT_ACL,&table_list,2))
      break;
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1364
#endif /*DONT_ALLOW_SHOW_COMMANDS*/
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1365
    mysqld_list_fields(thd,&table_list,fields);
1366
    free_items(thd->free_list);
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    break;
  }
#endif
  case COM_QUIT:
1371
    /* We don't calculate statistics for this command */
1372
    mysql_log.write(thd,command,NullS);
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    net->error=0;				// Don't give 'abort' message
    error=TRUE;					// End server
    break;

1377
  case COM_CREATE_DB:				// QQ: To be removed
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1378
    {
1379
      statistic_increment(com_stat[SQLCOM_CREATE_DB],&LOCK_status);
1380
      char *db=thd->strdup(packet);
1381
      // null test to handle EOM
1382
      if (!db || !strip_sp(db) || check_db_name(db))
1383
      {
1384
	net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
1385 1386
	break;
      }
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1387
      if (check_access(thd,CREATE_ACL,db,0,1,0))
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1388
	break;
1389
      mysql_log.write(thd,command,packet);
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1390
      mysql_create_db(thd,db,0,0);
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1391 1392
      break;
    }
1393
  case COM_DROP_DB:				// QQ: To be removed
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1394
    {
1395
      statistic_increment(com_stat[SQLCOM_DROP_DB],&LOCK_status);
1396
      char *db=thd->strdup(packet);
1397
      // null test to handle EOM
1398
      if (!db || !strip_sp(db) || check_db_name(db))
1399
      {
1400
	net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
1401 1402
	break;
      }
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1403
      if (check_access(thd,DROP_ACL,db,0,1,0))
1404
	break;
1405 1406
      if (thd->locked_tables || thd->active_transaction())
      {
1407
	send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
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1408
	break;
1409
      }
1410
      mysql_log.write(thd,command,db);
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1411
      mysql_rm_db(thd,db,0,0);
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1412 1413
      break;
    }
1414
#ifndef EMBEDDED_LIBRARY
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1415 1416
  case COM_BINLOG_DUMP:
    {
1417
      statistic_increment(com_other,&LOCK_status);
1418
      slow_command = TRUE;
1419
      if (check_global_access(thd, REPL_SLAVE_ACL))
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1420
	break;
1421
      mysql_log.write(thd,command, 0);
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1422

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1423 1424
      ulong pos;
      ushort flags;
1425
      uint32 slave_server_id;
1426
      /* TODO: The following has to be changed to an 8 byte integer */
1427 1428
      pos = uint4korr(packet);
      flags = uint2korr(packet + 4);
1429
      thd->server_id=0; /* avoid suicide */
1430
      if ((slave_server_id= uint4korr(packet+6))) // mysqlbinlog.server_id==0
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1431
	kill_zombie_dump_threads(slave_server_id);
1432
      thd->server_id = slave_server_id;
1433
      mysql_binlog_send(thd, thd->strdup(packet + 10), (my_off_t) pos, flags);
1434
      unregister_slave(thd,1,1);
1435 1436 1437
      // fake COM_QUIT -- if we get here, the thread needs to terminate
      error = TRUE;
      net->error = 0;
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1438 1439
      break;
    }
1440
#endif
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1441 1442
  case COM_REFRESH:
    {
1443
      statistic_increment(com_stat[SQLCOM_FLUSH],&LOCK_status);
1444
      ulong options= (ulong) (uchar) packet[0];
1445
      if (check_global_access(thd,RELOAD_ACL))
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1446
	break;
1447
      mysql_log.write(thd,command,NullS);
1448 1449 1450 1451
      if (reload_acl_and_cache(thd, options, (TABLE_LIST*) 0, NULL))
        send_error(thd, 0);
      else
        send_ok(thd);
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1452 1453
      break;
    }
1454
#ifndef EMBEDDED_LIBRARY
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1455
  case COM_SHUTDOWN:
1456
    statistic_increment(com_other,&LOCK_status);
1457
    if (check_global_access(thd,SHUTDOWN_ACL))
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1458 1459
      break; /* purecov: inspected */
    DBUG_PRINT("quit",("Got shutdown command"));
1460
    mysql_log.write(thd,command,NullS);
1461
    send_eof(thd);
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1462 1463 1464
#ifdef __WIN__
    sleep(1);					// must wait after eof()
#endif
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1465
#ifndef OS2
1466
    send_eof(thd);				// This is for 'quit request'
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monty@hundin.mysql.fi committed
1467
#endif
1468
    close_connection(thd, 0, 1);
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1469
    close_thread_tables(thd);			// Free before kill
1470
    free_root(&thd->mem_root,MYF(0));
1471
    free_root(&thd->transaction.mem_root,MYF(0));
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1472 1473 1474
    kill_mysql();
    error=TRUE;
    break;
1475
#endif
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1476 1477
  case COM_STATISTICS:
  {
1478
    mysql_log.write(thd,command,NullS);
1479
    statistic_increment(com_stat[SQLCOM_SHOW_STATUS],&LOCK_status);
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1480
#ifndef EMBEDDED_LIBRARY
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1481
    char buff[200];
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1482 1483 1484
#else
    char *buff= thd->net.last_error;
#endif
1485
    ulong uptime = (ulong) (thd->start_time - start_time);
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1486
    sprintf((char*) buff,
1487
	    "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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1488 1489 1490 1491 1492
	    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
1493
    if (sf_malloc_cur_memory)				// Using SAFEMALLOC
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1494
      sprintf(strend(buff), "  Memory in use: %ldK  Max memory used: %ldK",
1495 1496
	      (sf_malloc_cur_memory+1023L)/1024L,
	      (sf_malloc_max_memory+1023L)/1024L);
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1497 1498
#endif
#ifndef EMBEDDED_LIBRARY
1499
    VOID(my_net_write(net, buff,(uint) strlen(buff)));
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1500
    VOID(net_flush(net));
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1501
#endif
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1502 1503 1504
    break;
  }
  case COM_PING:
1505
    statistic_increment(com_other,&LOCK_status);
1506
    send_ok(thd);				// Tell client we are alive
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1507 1508
    break;
  case COM_PROCESS_INFO:
1509
    statistic_increment(com_stat[SQLCOM_SHOW_PROCESSLIST],&LOCK_status);
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1510
#ifndef NO_EMBEDDED_ACCESS_CHECKS
1511
    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
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1512
      break;
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1513
#endif
1514
    mysql_log.write(thd,command,NullS);
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1515 1516 1517 1518 1519 1520 1521 1522
    mysqld_list_processes(thd,
#ifndef NO_EMBEDDED_ACCESS_CHECKS
			  thd->master_access & PROCESS_ACL ? 
			  NullS : thd->priv_user
#else
			  NullS
#endif
			  ,0);
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1523 1524 1525
    break;
  case COM_PROCESS_KILL:
  {
1526
    statistic_increment(com_stat[SQLCOM_KILL],&LOCK_status);
1527
    ulong id=(ulong) uint4korr(packet);
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1528 1529 1530 1531
    kill_one_thread(thd,id);
    break;
  }
  case COM_DEBUG:
1532
    statistic_increment(com_other,&LOCK_status);
1533
    if (check_global_access(thd, SUPER_ACL))
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1534 1535
      break;					/* purecov: inspected */
    mysql_print_status(thd);
1536
    mysql_log.write(thd,command,NullS);
1537
    send_eof(thd);
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1538 1539 1540 1541 1542
    break;
  case COM_SLEEP:
  case COM_CONNECT:				// Impossible here
  case COM_TIME:				// Impossible from client
  case COM_DELAYED_INSERT:
1543
  case COM_END:
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1544
  default:
1545
    send_error(thd, ER_UNKNOWN_COM_ERROR);
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1546 1547
    break;
  }
1548
  if (thd->lock || thd->open_tables || thd->derived_tables)
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1549 1550 1551 1552 1553
  {
    thd->proc_info="closing tables";
    close_thread_tables(thd);			/* Free tables */
  }

1554
  if (thd->is_fatal_error)
1555
    send_error(thd,0);				// End of memory ?
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1556 1557

  time_t start_of_query=thd->start_time;
1558
  thd->end_time();				// Set start time
1559

1560
  /* If not reading from backup and if the query took too long */
1561
  if (!slow_command && !thd->user_time) // do not log 'slow_command' queries
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1562
  {
1563 1564
    thd->proc_info="logging slow query";

1565 1566
    if ((ulong) (thd->start_time - thd->time_after_lock) >
	thd->variables.long_query_time ||
1567
	((thd->lex.select_lex.options &
1568
	  (QUERY_NO_INDEX_USED | QUERY_NO_GOOD_INDEX_USED)) &&
1569
	 (specialflag & SPECIAL_LOG_QUERIES_NOT_USING_INDEXES)))
1570 1571 1572 1573
    {
      long_query_count++;
      mysql_slow_log.write(thd, thd->query, thd->query_length, start_of_query);
    }
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1574
  }
1575
  thd->proc_info="cleaning up";
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1576 1577 1578 1579 1580 1581
  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));
1582
  thd->packet.shrink(thd->variables.net_buffer_length);	// Reclaim some memory
1583
  free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
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1584 1585 1586
  DBUG_RETURN(error);
}

1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604

/*
  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
1605
  /* Remove garbage at start and end of query */
1606
  while (my_isspace(thd->charset(),packet[0]) && packet_length > 0)
1607 1608 1609 1610 1611
  {
    packet++;
    packet_length--;
  }
  char *pos=packet+packet_length;		// Point at end null
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1612
  while (packet_length > 0 &&
1613
	 (pos[-1] == ';' || my_isspace(thd->charset() ,pos[-1])))
1614 1615 1616 1617 1618 1619 1620
  {
    pos--;
    packet_length--;
  }
  /* We must allocate some extra memory for query cache */
  if (!(thd->query= (char*) thd->memdup_w_gap((gptr) (packet),
					      packet_length,
1621 1622
					      thd->db_length+ 1 +
					      QUERY_CACHE_FLAGS_SIZE)))
1623 1624 1625 1626 1627 1628 1629 1630 1631 1632
    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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1633 1634 1635 1636 1637 1638
/****************************************************************************
** mysql_execute_command
** Execute command saved in thd and current_lex->sql_command
****************************************************************************/

void
1639
mysql_execute_command(THD *thd)
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1640
{
1641
  int	res= 0;
1642
  LEX	*lex= &thd->lex;
1643
  TABLE_LIST *tables= (TABLE_LIST*) lex->select_lex.table_list.first;
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1644
  SELECT_LEX *select_lex= &lex->select_lex;
1645
  SELECT_LEX_UNIT *unit= &lex->unit;
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1646 1647
  DBUG_ENTER("mysql_execute_command");

1648 1649 1650 1651 1652 1653
  /*
    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.
  */
1654
  if (tables || &lex->select_lex != lex->all_selects_list)
1655 1656 1657 1658 1659 1660 1661
    mysql_reset_errors(thd);
  /*
    Save old warning count to be able to send to client how many warnings we
    got
  */
  thd->old_total_warn_count= thd->total_warn_count;

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SCRUM  
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1662
#ifdef HAVE_REPLICATION
1663 1664
  if (thd->slave_thread)
  {
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1665
    /*
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merge  
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1666 1667 1668 1669
      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
1670 1671 1672
    {
      /* we warn the slave SQL thread */
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
1673
      DBUG_VOID_RETURN;
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1674
    }
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merge  
monty@hundin.mysql.fi committed
1675 1676
#ifndef TO_BE_DELETED
    /*
1677 1678 1679
      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
1680
    */
1681 1682 1683
    if (lex->sql_command == SQLCOM_SELECT)
    {
      lex->sql_command = SQLCOM_DO;
1684
      lex->insert_list = &select_lex->item_list;
1685
    }
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merge  
monty@hundin.mysql.fi committed
1686
#endif
1687
  }
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1688
#endif /* !HAVE_REPLICATION */
1689
  /*
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bell@sanja.is.com.ua committed
1690 1691
    TODO: make derived tables processing 'inside' SELECT processing.
    TODO: solve problem with depended derived tables in subselects
1692
  */
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Sinisa@sinisa.nasamreza.org committed
1693
  if (lex->derived_tables)
1694
  {
1695 1696 1697
    for (SELECT_LEX *sl= lex->all_selects_list;
	 sl;
	 sl= sl->next_select_in_list())
1698
    {
1699 1700 1701
      for (TABLE_LIST *cursor= sl->get_table_list();
	   cursor;
	   cursor= cursor->next)
1702
      {
1703 1704 1705
	if (cursor->derived && (res=mysql_derived(thd, lex,
						  cursor->derived,
						  cursor)))
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peter@mysql.com committed
1706
	{
1707 1708 1709 1710
	  if (res < 0 || thd->net.report_error)
	    send_error(thd,thd->killed ? ER_SERVER_SHUTDOWN : 0);
	  DBUG_VOID_RETURN;
	}
1711 1712
      }
    }
1713
  }
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1714 1715
  if (&lex->select_lex != lex->all_selects_list &&
      lex->unit.create_total_list(thd, lex, &tables, 0))
1716
    DBUG_VOID_RETURN;
1717 1718 1719 1720 1721 1722
  
  /*
    When option readonly is set deny operations which change tables.
    Except for the replication thread and the 'super' users.
  */
  if (opt_readonly &&
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1723 1724 1725 1726 1727
      !(thd->slave_thread
#ifndef NO_EMBEDDED_ACCESS_CHECKS
	|| (thd->master_access & SUPER_ACL)
#endif
	) &&
1728 1729
      (uc_update_queries[lex->sql_command] > 0))
  {
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1730
    send_error(thd, ER_CANT_UPDATE_WITH_READLOCK);
1731 1732
    DBUG_VOID_RETURN;
  }
1733

1734
  statistic_increment(com_stat[lex->sql_command],&LOCK_status);
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1735 1736 1737
  switch (lex->sql_command) {
  case SQLCOM_SELECT:
  {
1738
    select_result *result=lex->result;
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1739
#ifndef NO_EMBEDDED_ACCESS_CHECKS
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1740 1741 1742 1743 1744
    if (tables)
    {
      res=check_table_access(thd,
			     lex->exchange ? SELECT_ACL | FILE_ACL :
			     SELECT_ACL,
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1745
			     tables,0);
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1746 1747 1748
    }
    else
      res=check_access(thd, lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL,
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1749
		       any_db,0,0,0);
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    if (res)
    {
      res=0;
      break;					// Error message is given
    }
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1755
#endif
1756 1757 1758 1759
    /* 
       In case of single SELECT unit->global_parameters points on first SELECT
       TODO: move counters to SELECT_LEX
    */
1760 1761 1762
    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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peter@mysql.com committed
1763
    if (unit->select_limit_cnt <
1764
	(ha_rows) unit->global_parameters->select_limit)
1765
      unit->select_limit_cnt= HA_POS_ERROR;		// no limit
1766
    if (unit->select_limit_cnt == HA_POS_ERROR && !select_lex->next_select())
1767
      select_lex->options&= ~OPTION_FOUND_ROWS;
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1768 1769

    if (!(res=open_and_lock_tables(thd,tables)))
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1770
    {
1771
      if (lex->describe)
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bell@sanja.is.com.ua committed
1772
      {
1773 1774 1775 1776 1777 1778 1779
	if (!(result= new select_send()))
	{
	  send_error(thd, ER_OUT_OF_RESOURCES);
	  DBUG_VOID_RETURN;
	}
	else
	  thd->send_explain_fields(result);
1780
	fix_tables_pointers(lex->all_selects_list);
1781
	res= mysql_explain_union(thd, &thd->lex.unit, result);
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1782 1783
	MYSQL_LOCK *save_lock= thd->lock;
	thd->lock= (MYSQL_LOCK *)0;
1784
	result->send_eof();
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1785 1786 1787 1788
	thd->lock= save_lock;
      }
      else
      {
1789 1790
	if (!result)
	{
1791
	  if (!(result=new select_send()))
1792 1793 1794 1795 1796 1797 1798 1799 1800
	  {
	    res= -1;
#ifdef DELETE_ITEMS
	    delete select_lex->having;
	    delete select_lex->where;
#endif
	    break;
	  }
	}
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1801 1802 1803
	query_cache_store_query(thd, tables);
	res=handle_select(thd, lex, result);
      }
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1804
    }
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1805 1806
    break;
  }
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1807

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monty@hundin.mysql.fi committed
1808
  case SQLCOM_DO:
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1809
    if (tables && ((res= check_table_access(thd, SELECT_ACL, tables,0)) ||
1810 1811 1812 1813 1814 1815 1816
		   (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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monty@hundin.mysql.fi committed
1817 1818
    break;

1819
  case SQLCOM_EMPTY_QUERY:
1820
    send_ok(thd);
1821 1822
    break;

1823 1824 1825 1826
  case SQLCOM_HELP:
    res= mysqld_help(thd,lex->help_arg);
    break;

1827
#ifndef EMBEDDED_LIBRARY
1828
  case SQLCOM_PURGE:
1829
  {
1830
    if (check_global_access(thd, SUPER_ACL))
1831
      goto error;
1832
    // PURGE MASTER LOGS TO 'file'
1833 1834 1835
    res = purge_master_logs(thd, lex->to_log);
    break;
  }
1836 1837 1838 1839 1840 1841 1842 1843
  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;
  }
1844
#endif
1845 1846
  case SQLCOM_SHOW_WARNS:
  {
1847 1848
    res= mysqld_show_warnings(thd, (ulong)
			      ((1L << (uint) MYSQL_ERROR::WARN_LEVEL_NOTE) |
1849 1850 1851
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_WARN) |
			       (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR)
			       ));
1852 1853 1854 1855
    break;
  }
  case SQLCOM_SHOW_ERRORS:
  {
1856 1857
    res= mysqld_show_warnings(thd, (ulong)
			      (1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR));
1858 1859
    break;
  }
1860 1861
  case SQLCOM_SHOW_NEW_MASTER:
  {
1862
    if (check_global_access(thd, REPL_SLAVE_ACL))
1863
      goto error;
1864
    /* This query don't work now. See comment in repl_failsafe.cc */
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
1865
#ifndef WORKING_NEW_MASTER
1866
    net_printf(thd, ER_NOT_SUPPORTED_YET, "SHOW NEW MASTER");
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1867 1868
    res= 1;
#else
1869
    res = show_new_master(thd);
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1870
#endif
1871 1872
    break;
  }
1873

1874
#ifdef HAVE_REPLICATION
1875 1876
  case SQLCOM_SHOW_SLAVE_HOSTS:
  {
1877
    if (check_global_access(thd, REPL_SLAVE_ACL))
1878 1879 1880 1881
      goto error;
    res = show_slave_hosts(thd);
    break;
  }
1882 1883
  case SQLCOM_SHOW_BINLOG_EVENTS:
  {
1884
    if (check_global_access(thd, REPL_SLAVE_ACL))
1885 1886 1887 1888
      goto error;
    res = show_binlog_events(thd);
    break;
  }
1889 1890
#endif

1891
  case SQLCOM_BACKUP_TABLE:
1892 1893
  {
    if (check_db_used(thd,tables) ||
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1894
	check_table_access(thd,SELECT_ACL, tables,0) ||
1895
	check_global_access(thd, FILE_ACL))
1896 1897
      goto error; /* purecov: inspected */
    res = mysql_backup_table(thd, tables);
1898

1899 1900
    break;
  }
1901
  case SQLCOM_RESTORE_TABLE:
1902 1903
  {
    if (check_db_used(thd,tables) ||
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1904
	check_table_access(thd, INSERT_ACL, tables,0) ||
1905
	check_global_access(thd, FILE_ACL))
1906 1907 1908 1909
      goto error; /* purecov: inspected */
    res = mysql_restore_table(thd, tables);
    break;
  }
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1910 1911 1912
  case SQLCOM_PRELOAD_KEYS:
  {
    if (check_db_used(thd, tables) ||
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1913
	check_access(thd, INDEX_ACL, tables->db, &tables->grant.privilege,0,0))
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1914 1915 1916 1917
      goto error; 
    res = mysql_preload_keys(thd, tables);
    break;
  }
1918
#ifdef HAVE_REPLICATION
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1919
  case SQLCOM_CHANGE_MASTER:
1920
  {
1921
    if (check_global_access(thd, SUPER_ACL))
1922
      goto error;
1923 1924 1925
    LOCK_ACTIVE_MI;
    res = change_master(thd,active_mi);
    UNLOCK_ACTIVE_MI;
1926 1927
    break;
  }
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1928
  case SQLCOM_SHOW_SLAVE_STAT:
1929
  {
1930 1931
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
1932
      goto error;
1933 1934 1935
    LOCK_ACTIVE_MI;
    res = show_master_info(thd,active_mi);
    UNLOCK_ACTIVE_MI;
1936 1937
    break;
  }
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1938
  case SQLCOM_SHOW_MASTER_STAT:
1939
  {
1940 1941
    /* Accept one of two privileges */
    if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
1942 1943 1944 1945
      goto error;
    res = show_binlog_info(thd);
    break;
  }
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1946

1947
  case SQLCOM_LOAD_MASTER_DATA: // sync with master
1948
    if (check_global_access(thd, SUPER_ACL))
1949
      goto error;
1950 1951 1952 1953
    if (end_active_trans(thd))
      res= -1;
    else
      res = load_master_data(thd);
1954
    break;
1955
#endif /* HAVE_REPLICATION */
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1956 1957 1958
#ifdef HAVE_INNOBASE_DB
  case SQLCOM_SHOW_INNODB_STATUS:
    {
1959
      if (check_global_access(thd, SUPER_ACL))
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1960 1961 1962 1963 1964
	goto error;
      res = innodb_show_status(thd);
      break;
    }
#endif
1965
#ifdef HAVE_REPLICATION
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1966
  case SQLCOM_LOAD_MASTER_TABLE:
1967
  {
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1968 1969
    if (!tables->db)
      tables->db=thd->db;
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1970 1971
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,CREATE_ACL,tables->db,&tables->grant.privilege,0,0))
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1972 1973 1974 1975 1976 1977 1978 1979 1980
      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)
1981
	goto error;
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1982
    }
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1983
#endif
1984
    if (strlen(tables->real_name) > NAME_LEN)
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1985
    {
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
1986
      net_printf(thd,ER_WRONG_TABLE_NAME,tables->real_name);
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1987 1988
      break;
    }
1989
    LOCK_ACTIVE_MI;
1990 1991 1992 1993
    /*
      fetch_master_table will send the error to the client on failure.
      Give error if the table already exists.
    */
1994
    if (!fetch_master_table(thd, tables->db, tables->real_name,
1995
			    active_mi, 0, 0))
1996
    {
1997
      send_ok(thd);
1998 1999
    }
    UNLOCK_ACTIVE_MI;
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2000
    break;
2001
  }
2002
#endif /* HAVE_REPLICATION */
2003

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2004
  case SQLCOM_CREATE_TABLE:
2005
  {
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hf@deer.(none) committed
2006
#ifndef NO_EMBEDDED_ACCESS_CHECKS
2007 2008
    ulong want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
		      CREATE_TMP_ACL : CREATE_ACL);
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hf@deer.(none) committed
2009
#endif
2010 2011
    if (!tables->db)
      tables->db=thd->db;
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hf@deer.(none) committed
2012 2013
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,want_priv,tables->db,&tables->grant.privilege,0,0) ||
2014 2015 2016
	check_merge_table_access(thd, tables->db,
				 (TABLE_LIST *)
				 lex->create_info.merge_list.first))
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bk@work.mysql.com committed
2017
      goto error;				/* purecov: inspected */
2018
    if (grant_option && want_priv != CREATE_TMP_ACL)
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bk@work.mysql.com committed
2019 2020 2021 2022
    {
      /* Check that the first table has CREATE privilege */
      TABLE_LIST *tmp_table_list=tables->next;
      tables->next=0;
2023
      bool error=check_grant(thd, want_priv, tables);
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bk@work.mysql.com committed
2024 2025 2026 2027
      tables->next=tmp_table_list;
      if (error)
	goto error;
    }
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2028
#endif
2029
    if (strlen(tables->real_name) > NAME_LEN)
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2030
    {
monty@mashka.mysql.fi's avatar
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2031
      net_printf(thd, ER_WRONG_TABLE_NAME, tables->alias);
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2032 2033 2034
      res=0;
      break;
    }
2035 2036 2037
#ifndef HAVE_READLINK
    lex->create_info.data_file_name=lex->create_info.index_file_name=0;
#else
2038
    /* Fix names if symlinked tables */
2039
    if (append_file_to_dir(thd, &lex->create_info.data_file_name,
2040
			   tables->real_name) ||
2041
	append_file_to_dir(thd,&lex->create_info.index_file_name,
2042
			   tables->real_name))
2043 2044 2045 2046
    {
      res=-1;
      break;
    }
2047
#endif
2048
    if (select_lex->item_list.elements)		// With select
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bk@work.mysql.com committed
2049 2050 2051 2052
    {
      select_result *result;

      if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
2053
	  find_real_table_in_list(tables->next, tables->db, tables->real_name))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2054
      {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2055
	net_printf(thd,ER_UPDATE_TABLE_USED,tables->real_name);
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bk@work.mysql.com committed
2056 2057
	DBUG_VOID_RETURN;
      }
hf@deer.(none)'s avatar
hf@deer.(none) committed
2058
#ifndef NO_EMBEDDED_ACCESS_CHECKS
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2059 2060
      if (tables->next)
      {
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2061
	if (check_table_access(thd, SELECT_ACL, tables->next,0))
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bk@work.mysql.com committed
2062 2063
	  goto error;				// Error message is given
      }
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hf@deer.(none) committed
2064
#endif
2065
      select_lex->options|= SELECT_NO_UNLOCK;
2066 2067 2068 2069 2070
      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
2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086

      /* 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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2087 2088
    else // regular create
    {
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venu@myvenu.com committed
2089 2090 2091 2092
      if (lex->name)
        res= mysql_create_like_table(thd, tables, &lex->create_info, 
                                     (Table_ident *)lex->name); 
      else
2093
      {
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venu@myvenu.com committed
2094 2095 2096 2097
        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
2098
      }
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2099
      if (!res)
2100
	send_ok(thd);
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bk@work.mysql.com committed
2101 2102
    }
    break;
2103
  }
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2104 2105 2106
  case SQLCOM_CREATE_INDEX:
    if (!tables->db)
      tables->db=thd->db;
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hf@deer.(none) committed
2107 2108
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,INDEX_ACL,tables->db,&tables->grant.privilege,0,0))
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2109 2110 2111
      goto error; /* purecov: inspected */
    if (grant_option && check_grant(thd,INDEX_ACL,tables))
      goto error;
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hf@deer.(none) committed
2112
#endif
2113 2114 2115 2116
    if (end_active_trans(thd))
      res= -1;
    else
      res = mysql_create_index(thd, tables, lex->key_list);
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2117 2118
    break;

2119
#ifdef HAVE_REPLICATION
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2120
  case SQLCOM_SLAVE_START:
2121 2122 2123 2124
  {
    LOCK_ACTIVE_MI;
    start_slave(thd,active_mi,1 /* net report*/);
    UNLOCK_ACTIVE_MI;
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2125
    break;
2126
  }
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2127
  case SQLCOM_SLAVE_STOP:
2128 2129 2130 2131 2132 2133
  /*
    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,
2134
      so it waits for the client thread because t is locked by it.
2135
    - then the client thread does SLAVE STOP.
2136 2137
      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.
2138 2139 2140 2141 2142
    To prevent that, refuse SLAVE STOP if the
    client thread has locked tables
  */
  if (thd->locked_tables || thd->active_transaction())
  {
2143
    send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
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2144
    break;
2145
  }
2146 2147 2148 2149
  {
    LOCK_ACTIVE_MI;
    stop_slave(thd,active_mi,1/* net report*/);
    UNLOCK_ACTIVE_MI;
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2150
    break;
2151
  }
2152
#endif /* HAVE_REPLICATION */
2153

bk@work.mysql.com's avatar
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2154 2155
  case SQLCOM_ALTER_TABLE:
#if defined(DONT_ALLOW_SHOW_COMMANDS)
2156
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
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2157 2158 2159
    break;
#else
    {
2160
      ulong priv=0;
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2161
      if (lex->name && (!lex->name[0] || strlen(lex->name) > NAME_LEN))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2162
      {
2163
	net_printf(thd,ER_WRONG_TABLE_NAME,lex->name);
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bk@work.mysql.com committed
2164 2165 2166
	res=0;
	break;
      }
2167 2168
      if (!tables->db)
	tables->db=thd->db;
2169 2170
      if (!select_lex->db)
	select_lex->db=tables->db;
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hf@deer.(none) committed
2171 2172
      if (check_access(thd,ALTER_ACL,tables->db,&tables->grant.privilege,0,0) ||
	  check_access(thd,INSERT_ACL | CREATE_ACL,select_lex->db,&priv,0,0)||
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2173
	  check_merge_table_access(thd, tables->db,
2174 2175 2176
				   (TABLE_LIST *)
				   lex->create_info.merge_list.first))
	goto error;				/* purecov: inspected */
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2177 2178
      if (!tables->db)
	tables->db=thd->db;
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hf@deer.(none) committed
2179
#ifndef NO_EMBEDDED_ACCESS_CHECKS
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2180 2181 2182 2183 2184 2185 2186 2187 2188
      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;
2189
	  tmp_table.db=select_lex->db;
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2190 2191 2192 2193 2194
	  tmp_table.grant.privilege=priv;
	  if (check_grant(thd,INSERT_ACL | CREATE_ACL,tables))
	    goto error;
	}
      }
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2195
#endif
2196 2197
      /* 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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2198
      /* ALTER TABLE ends previous transaction */
2199
      if (end_active_trans(thd))
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2200 2201
	res= -1;
      else
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2202
      {
2203
	res= mysql_alter_table(thd, select_lex->db, lex->name,
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2204 2205 2206
			       &lex->create_info,
			       tables, lex->create_list,
			       lex->key_list, lex->drop_list, lex->alter_list,
2207
			       select_lex->order_list.elements,
2208
                               (ORDER *) select_lex->order_list.first,
2209
			       lex->drop_primary, lex->duplicates,
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heikki@hundin.mysql.fi committed
2210 2211 2212
			       lex->alter_keys_onoff,
                               lex->tablespace_op,
			       lex->simple_alter);
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2213
      }
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2214 2215
      break;
    }
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2216
#endif /*DONT_ALLOW_SHOW_COMMANDS*/
2217
  case SQLCOM_RENAME_TABLE:
2218 2219 2220
  {
    TABLE_LIST *table;
    if (check_db_used(thd,tables))
2221
      goto error;
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hf@deer.(none) committed
2222
#ifndef NO_EMBEDDED_ACCESS_CHECKS
2223 2224
    for (table=tables ; table ; table=table->next->next)
    {
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2225
      if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
hf@deer.(none)'s avatar
hf@deer.(none) committed
2226
		       &table->grant.privilege,0,0) ||
2227
	  check_access(thd, INSERT_ACL | CREATE_ACL, table->next->db,
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hf@deer.(none) committed
2228
		       &table->next->grant.privilege,0,0))
2229 2230 2231
	goto error;
      if (grant_option)
      {
monty@donna.mysql.com's avatar
monty@donna.mysql.com committed
2232 2233 2234 2235 2236
	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) ||
2237
	    (!test_all_bits(table->next->grant.privilege,
2238
			    INSERT_ACL | CREATE_ACL) &&
monty@donna.mysql.com's avatar
monty@donna.mysql.com committed
2239
	     check_grant(thd,INSERT_ACL | CREATE_ACL, &new_list)))
2240 2241 2242
	  goto error;
      }
    }
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hf@deer.(none) committed
2243
#endif
2244
    query_cache_invalidate3(thd, tables, 0);
2245 2246 2247
    if (end_active_trans(thd))
      res= -1;
    else if (mysql_rename_tables(thd,tables))
2248 2249
      res= -1;
    break;
2250
  }
2251
#ifndef EMBEDDED_LIBRARY
2252 2253
  case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2254
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
2255 2256 2257
    DBUG_VOID_RETURN;
#else
    {
2258
      if (check_global_access(thd, SUPER_ACL))
2259 2260 2261 2262
	goto error;
      res = show_binlogs(thd);
      break;
    }
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peter@mysql.com committed
2263
#endif
2264
#endif /* EMBEDDED_LIBRARY */
bk@work.mysql.com's avatar
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2265
  case SQLCOM_SHOW_CREATE:
2266
#ifdef DONT_ALLOW_SHOW_COMMANDS
2267
    send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
2268 2269
    DBUG_VOID_RETURN;
#else
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bk@work.mysql.com committed
2270
    {
2271 2272
      if (check_db_used(thd, tables) ||
	  check_access(thd, SELECT_ACL | EXTRA_ACL, tables->db,
hf@deer.(none)'s avatar
hf@deer.(none) committed
2273
		       &tables->grant.privilege,0,0))
2274
	goto error;
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2275
      res = mysqld_show_create(thd, tables);
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bk@work.mysql.com committed
2276 2277
      break;
    }
2278
#endif
2279 2280 2281
  case SQLCOM_CHECKSUM:
  {
    if (check_db_used(thd,tables) ||
hf@deer.(none)'s avatar
hf@deer.(none) committed
2282
	check_table_access(thd, SELECT_ACL | EXTRA_ACL , tables,0))
2283
      goto error; /* purecov: inspected */
2284
    res = mysql_checksum_table(thd, tables, &lex->check_opt);
2285 2286
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2287
  case SQLCOM_REPAIR:
2288 2289
  {
    if (check_db_used(thd,tables) ||
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hf@deer.(none) committed
2290
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables,0))
2291 2292
      goto error; /* purecov: inspected */
    res = mysql_repair_table(thd, tables, &lex->check_opt);
2293 2294 2295 2296 2297 2298 2299 2300 2301 2302
    /* ! 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);
      }
    }
2303 2304
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2305
  case SQLCOM_CHECK:
2306 2307
  {
    if (check_db_used(thd,tables) ||
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hf@deer.(none) committed
2308
 	check_table_access(thd, SELECT_ACL | EXTRA_ACL , tables,0))
2309 2310 2311 2312
      goto error; /* purecov: inspected */
    res = mysql_check_table(thd, tables, &lex->check_opt);
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2313 2314
  case SQLCOM_ANALYZE:
  {
2315
    if (check_db_used(thd,tables) ||
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hf@deer.(none) committed
2316
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables,0))
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bk@work.mysql.com committed
2317
      goto error; /* purecov: inspected */
2318
    res = mysql_analyze_table(thd, tables, &lex->check_opt);
2319 2320 2321 2322 2323 2324 2325 2326 2327 2328
    /* ! 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);
      }
    }
2329
    break;
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2330
  }
2331

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bk@work.mysql.com committed
2332 2333 2334
  case SQLCOM_OPTIMIZE:
  {
    HA_CREATE_INFO create_info;
2335
    if (check_db_used(thd,tables) ||
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hf@deer.(none) committed
2336
	check_table_access(thd,SELECT_ACL | INSERT_ACL, tables,0))
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bk@work.mysql.com committed
2337
      goto error; /* purecov: inspected */
2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348
    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;
2349
      create_info.table_charset=default_charset_info;
2350 2351 2352
      res= mysql_alter_table(thd, NullS, NullS, &create_info,
			     tables, lex->create_list,
			     lex->key_list, lex->drop_list, lex->alter_list,
2353 2354
                             0, (ORDER *) 0,
			     0, DUP_ERROR);
2355 2356 2357
    }
    else
      res = mysql_optimize_table(thd, tables, &lex->check_opt);
2358 2359 2360 2361 2362 2363 2364 2365 2366 2367
    /* ! 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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bk@work.mysql.com committed
2368 2369 2370
    break;
  }
  case SQLCOM_UPDATE:
2371
    if (check_db_used(thd,tables))
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bk@work.mysql.com committed
2372
      goto error;
2373

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bell@sanja.is.com.ua committed
2374
    if (single_table_command_access(thd, UPDATE_ACL, tables, &res))
2375
	goto error;
2376
    if (select_lex->item_list.elements != lex->value_list.elements)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2377
    {
2378
      send_error(thd,ER_WRONG_VALUE_COUNT);
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bk@work.mysql.com committed
2379 2380
      DBUG_VOID_RETURN;
    }
2381 2382 2383 2384
    res= mysql_update(thd,tables,
                      select_lex->item_list,
                      lex->value_list,
                      select_lex->where,
2385
		      select_lex->order_list.elements,
2386 2387 2388
                      (ORDER *) select_lex->order_list.first,
                      select_lex->select_limit,
                      lex->duplicates);
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bell@sanja.is.com.ua committed
2389 2390
    if (thd->net.report_error)
      res= -1;
2391 2392
    break;
  case SQLCOM_UPDATE_MULTI:
hf@deer.(none)'s avatar
hf@deer.(none) committed
2393 2394
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,UPDATE_ACL,tables->db,&tables->grant.privilege,0,0))
2395 2396 2397
      goto error;
    if (grant_option && check_grant(thd,UPDATE_ACL,tables))
      goto error;
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hf@deer.(none) committed
2398
#endif
2399
    if (select_lex->item_list.elements != lex->value_list.elements)
2400
    {
2401 2402
      send_error(thd,ER_WRONG_VALUE_COUNT);
      DBUG_VOID_RETURN;
2403 2404
    }
    {
2405
      const char *msg= 0;
2406
      if (select_lex->order_list.elements)
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2407
	msg= "ORDER BY";
2408 2409
      else if (select_lex->select_limit && select_lex->select_limit !=
	       HA_POS_ERROR)
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2410
	msg= "LIMIT";
2411
      if (msg)
2412
      {
2413
	net_printf(thd, ER_WRONG_USAGE, "UPDATE", msg);
2414 2415
	res= 1;
	break;
2416
      }
2417 2418 2419 2420 2421
      res= mysql_multi_update(thd,tables,
			      &select_lex->item_list,
			      &lex->value_list,
			      select_lex->where,
			      select_lex->options,
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2422
			      lex->duplicates, unit, select_lex);
2423
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2424 2425
    break;
  case SQLCOM_REPLACE:
2426 2427
  case SQLCOM_INSERT:
  {
hf@deer.(none)'s avatar
hf@deer.(none) committed
2428
#ifndef NO_EMBEDDED_ACCESS_CHECKS
2429
    my_bool update=(lex->value_list.elements ? UPDATE_ACL : 0);
2430
    ulong privilege= (lex->duplicates == DUP_REPLACE ?
2431
                      INSERT_ACL | DELETE_ACL : INSERT_ACL | update);
2432

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bell@sanja.is.com.ua committed
2433
    if (single_table_command_access(thd, privilege, tables, &res))
2434
	goto error;
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
2435 2436
#else
    my_bool update=(lex->value_list.elements ? 1 : 0);
hf@deer.(none)'s avatar
hf@deer.(none) committed
2437
#endif
2438 2439 2440 2441 2442
    if (select_lex->item_list.elements != lex->value_list.elements)
    {
      send_error(thd,ER_WRONG_VALUE_COUNT);
      DBUG_VOID_RETURN;
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2443
    res = mysql_insert(thd,tables,lex->field_list,lex->many_values,
2444
                       select_lex->item_list, lex->value_list,
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
2445
                       (update ? DUP_UPDATE : lex->duplicates));
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2446 2447
    if (thd->net.report_error)
      res= -1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2448
    break;
2449
  }
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bk@work.mysql.com committed
2450 2451 2452
  case SQLCOM_REPLACE_SELECT:
  case SQLCOM_INSERT_SELECT:
  {
2453

2454 2455 2456 2457
    /*
      Check that we have modify privileges for the first table and
      select privileges for the rest
    */
hf@deer.(none)'s avatar
hf@deer.(none) committed
2458
#ifndef NO_EMBEDDED_ACCESS_CHECKS
2459
    {
2460 2461
      ulong privilege= (lex->duplicates == DUP_REPLACE ?
                        INSERT_ACL | DELETE_ACL : INSERT_ACL);
2462 2463 2464
      TABLE_LIST *save_next=tables->next;
      tables->next=0;
      if (check_access(thd, privilege,
hf@deer.(none)'s avatar
hf@deer.(none) committed
2465
		       tables->db,&tables->grant.privilege,0,0) ||
2466 2467
	  (grant_option && check_grant(thd, privilege, tables)))
	goto error;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2468

2469
      tables->next=save_next;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2470
      if ((res=check_table_access(thd, SELECT_ACL, save_next,0)))
2471 2472
	goto error;
    }
hf@deer.(none)'s avatar
hf@deer.(none) committed
2473
#endif
2474 2475
    /* Don't unlock tables until command is written to binary log */
    select_lex->options|= SELECT_NO_UNLOCK;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2476 2477

    select_result *result;
2478 2479 2480 2481
    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
2482

2483
    if (find_real_table_in_list(tables->next, tables->db, tables->real_name))
2484
    {
2485 2486
      /* Using same table for INSERT and SELECT */
      select_lex->options |= OPTION_BUFFER_RESULT;
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bk@work.mysql.com committed
2487
    }
2488 2489 2490 2491

    /* 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);
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2492 2493
    lex->select_lex.resolve_mode= SELECT_LEX::NOMATTER_MODE;

2494 2495 2496
    if (!(res=open_and_lock_tables(thd, tables)))
    {
      if ((result=new select_insert(tables->table,&lex->field_list,
2497
				    lex->duplicates)))
2498
	res=handle_select(thd,lex,result);
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bell@sanja.is.com.ua committed
2499 2500
      if (thd->net.report_error)
	res= -1;
2501 2502 2503
    }
    else
      res= -1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2504 2505
    break;
  }
2506
  case SQLCOM_TRUNCATE:
hf@deer.(none)'s avatar
hf@deer.(none) committed
2507 2508
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,DELETE_ACL,tables->db,&tables->grant.privilege,0,0))
2509
      goto error; /* purecov: inspected */
2510 2511
    if (grant_option && check_grant(thd,DELETE_ACL,tables))
      goto error;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2512
#endif
2513 2514 2515 2516 2517 2518
    /*
      Don't allow this within a transaction because we want to use
      re-generate table
    */
    if (thd->locked_tables || thd->active_transaction())
    {
2519
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION,NullS);
2520 2521 2522 2523
      goto error;
    }
    res=mysql_truncate(thd,tables);
    break;
2524
  case SQLCOM_DELETE:
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2525
  {
hf@deer.(none)'s avatar
hf@deer.(none) committed
2526
#ifndef NO_EMBEDDED_ACCESS_CHECKS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2527 2528
    if (single_table_command_access(thd, DELETE_ACL, tables, &res))
      goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2529 2530
    // Set privilege for the WHERE clause
    tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
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hf@deer.(none) committed
2531
#endif
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serg@serg.mysql.com committed
2532 2533
    res = mysql_delete(thd,tables, select_lex->where,
                       (ORDER*) select_lex->order_list.first,
2534
                       select_lex->select_limit, select_lex->options);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2535 2536
    if (thd->net.report_error)
      res= -1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2537 2538
    break;
  }
2539
  case SQLCOM_DELETE_MULTI:
2540 2541 2542 2543 2544
  {
    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
2545

2546 2547
    /* sql_yacc guarantees that tables and aux_tables are not zero */
    if (check_db_used(thd, tables) || check_db_used(thd,aux_tables) ||
hf@deer.(none)'s avatar
hf@deer.(none) committed
2548 2549
	check_table_access(thd,SELECT_ACL, tables,0) ||
	check_table_access(thd,DELETE_ACL, aux_tables,0))
2550 2551
      goto error;
    if ((thd->options & OPTION_SAFE_UPDATES) && !select_lex->where)
2552
    {
2553
      send_error(thd,ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE);
2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568
      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)
      {
2569
	net_printf(thd,ER_NONUNIQ_TABLE,auxi->real_name);
2570 2571
	goto error;
      }
2572
      walk->lock_type= auxi->lock_type;
2573
      auxi->table_list=  walk;		// Remember corresponding table
2574
    }
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2575
    if (add_item_to_list(thd, new Item_null()))
2576
    {
2577
      res= -1;
2578
      break;
2579 2580 2581 2582 2583 2584
    }
    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)
2585
      auxi->table= auxi->table_list->table;
2586
    if (&lex->select_lex != lex->all_selects_list)
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2587
    {
2588 2589 2590 2591 2592
      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
2593
	  my_error(ER_UPDATE_TABLE_USED, MYF(0), t->real_name);
2594 2595 2596 2597
	  res= -1;
	  break;
	}
      }
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2598
    }
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2599
    fix_tables_pointers(lex->all_selects_list);
2600 2601
    if (!thd->is_fatal_error && (result= new multi_delete(thd,aux_tables,
							  table_count)))
2602
    {
2603 2604 2605
      res= mysql_select(thd, &select_lex->ref_pointer_array,
			select_lex->get_table_list(),
			select_lex->with_wild,
2606
			select_lex->item_list,
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2607
			select_lex->where,
2608
			0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2609 2610
			(ORDER *)NULL,
			select_lex->options | thd->options |
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
2611
			SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK,
2612
			result, unit, select_lex, 0);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2613 2614
      if (thd->net.report_error)
	res= -1;
2615
      delete result;
2616 2617 2618 2619 2620 2621
    }
    else
      res= -1;					// Error is not sent
    close_thread_tables(thd);
    break;
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2622
  case SQLCOM_DROP_TABLE:
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
2623
  {
2624 2625
    if (!lex->drop_temporary)
    {
hf@deer.(none)'s avatar
hf@deer.(none) committed
2626
      if (check_table_access(thd,DROP_ACL,tables,0))
2627 2628 2629 2630 2631 2632 2633
	goto error;				/* purecov: inspected */
      if (end_active_trans(thd))
      {
	res= -1;
	break;
      }
    }
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
2634
    else
monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646
    {
      /*
	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;
    }
2647
    res= mysql_rm_table(thd,tables,lex->drop_if_exists, lex->drop_temporary);
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
2648 2649
  }
  break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2650 2651 2652
  case SQLCOM_DROP_INDEX:
    if (!tables->db)
      tables->db=thd->db;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2653 2654
#ifndef NO_EMBEDDED_ACCESS_CHECKS
    if (check_access(thd,INDEX_ACL,tables->db,&tables->grant.privilege,0,0))
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bk@work.mysql.com committed
2655 2656 2657
      goto error;				/* purecov: inspected */
    if (grant_option && check_grant(thd,INDEX_ACL,tables))
      goto error;
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hf@deer.(none) committed
2658
#endif
2659 2660 2661 2662
    if (end_active_trans(thd))
      res= -1;
    else
      res = mysql_drop_index(thd, tables, lex->drop_list);
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2663 2664
    break;
  case SQLCOM_SHOW_DATABASES:
2665
#if defined(DONT_ALLOW_SHOW_COMMANDS)
2666
    send_error(thd,ER_NOT_ALLOWED_COMMAND);   /* purecov: inspected */
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bk@work.mysql.com committed
2667 2668 2669
    DBUG_VOID_RETURN;
#else
    if ((specialflag & SPECIAL_SKIP_SHOW_DB) &&
2670
	check_global_access(thd, SHOW_DB_ACL))
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bk@work.mysql.com committed
2671 2672 2673 2674 2675
      goto error;
    res= mysqld_show_dbs(thd, (lex->wild ? lex->wild->ptr() : NullS));
    break;
#endif
  case SQLCOM_SHOW_PROCESSLIST:
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hf@deer.(none) committed
2676
#ifndef NO_EMBEDDED_ACCESS_CHECKS
2677
    if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
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bk@work.mysql.com committed
2678
      break;
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hf@deer.(none) committed
2679
#endif
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2680 2681 2682 2683 2684 2685 2686 2687
    mysqld_list_processes(thd,
#ifndef NO_EMBEDDED_ACCESS_CHECKS
			  thd->master_access & PROCESS_ACL ? NullS :
			  thd->priv_user
#else
			  NullS
#endif
			  ,lex->verbose);
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bk@work.mysql.com committed
2688
    break;
2689 2690 2691 2692 2693 2694 2695 2696 2697
  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
2698
  case SQLCOM_SHOW_STATUS:
2699
    res= mysqld_show(thd,(lex->wild ? lex->wild->ptr() : NullS),status_vars,
2700
		     OPT_GLOBAL, &LOCK_status);
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bk@work.mysql.com committed
2701 2702 2703
    break;
  case SQLCOM_SHOW_VARIABLES:
    res= mysqld_show(thd, (lex->wild ? lex->wild->ptr() : NullS),
2704 2705
		     init_vars, lex->option_type,
		     &LOCK_global_system_variables);
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bk@work.mysql.com committed
2706
    break;
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tim@cane.mysql.fi committed
2707 2708
  case SQLCOM_SHOW_LOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2709
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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tim@cane.mysql.fi committed
2710 2711 2712
    DBUG_VOID_RETURN;
#else
    {
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hf@deer.(none) committed
2713 2714
#ifndef NO_EMBEDDED_ACCESS_CHECKS
      if (grant_option && check_access(thd, FILE_ACL, any_db,0,0,0))
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tim@cane.mysql.fi committed
2715
	goto error;
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hf@deer.(none) committed
2716
#endif
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2717 2718 2719 2720
      res= mysqld_show_logs(thd);
      break;
    }
#endif
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bk@work.mysql.com committed
2721
  case SQLCOM_SHOW_TABLES:
2722
    /* FALL THROUGH */
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bk@work.mysql.com committed
2723
#ifdef DONT_ALLOW_SHOW_COMMANDS
2724
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2725 2726 2727
    DBUG_VOID_RETURN;
#else
    {
2728
      char *db=select_lex->db ? select_lex->db : thd->db;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2729 2730
      if (!db)
      {
2731
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
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bk@work.mysql.com committed
2732 2733 2734
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);				// Fix escaped '_'
2735
      if (check_db_name(db))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2736
      {
2737
        net_printf(thd,ER_WRONG_DB_NAME, db);
2738
        goto error;
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bk@work.mysql.com committed
2739
      }
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hf@deer.(none) committed
2740 2741
#ifndef NO_EMBEDDED_ACCESS_CHECKS
      if (check_access(thd,SELECT_ACL,db,&thd->col_access,0,0))
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bk@work.mysql.com committed
2742
	goto error;				/* purecov: inspected */
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
2743
      if (!thd->col_access && check_grant_db(thd,db))
2744
      {
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monty@mashka.mysql.fi committed
2745
	net_printf(thd, ER_DBACCESS_DENIED_ERROR,
2746 2747 2748 2749 2750
		   thd->priv_user,
		   thd->priv_host,
		   db);
	goto error;
      }
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hf@deer.(none) committed
2751
#endif
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bk@work.mysql.com committed
2752
      /* grant is checked in mysqld_show_tables */
2753
      if (select_lex->options & SELECT_DESCRIBE)
2754
        res= mysqld_extend_show_tables(thd,db,
2755
				       (lex->wild ? lex->wild->ptr() : NullS));
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2756 2757 2758 2759 2760 2761
      else
	res= mysqld_show_tables(thd,db,
				(lex->wild ? lex->wild->ptr() : NullS));
      break;
    }
#endif
2762 2763 2764
  case SQLCOM_SHOW_OPEN_TABLES:
    res= mysqld_show_open_tables(thd,(lex->wild ? lex->wild->ptr() : NullS));
    break;
2765 2766
  case SQLCOM_SHOW_CHARSETS:
    res= mysqld_show_charsets(thd,(lex->wild ? lex->wild->ptr() : NullS));
2767
    break;
2768 2769 2770
  case SQLCOM_SHOW_COLLATIONS:
    res= mysqld_show_collations(thd,(lex->wild ? lex->wild->ptr() : NullS));
    break;
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bk@work.mysql.com committed
2771 2772
  case SQLCOM_SHOW_FIELDS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2773
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
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bk@work.mysql.com committed
2774 2775 2776
    DBUG_VOID_RETURN;
#else
    {
2777 2778
      char *db=tables->db;
      if (!*db)
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bk@work.mysql.com committed
2779
      {
2780
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
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bk@work.mysql.com committed
2781 2782 2783
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);			// Fix escaped '_'
2784
      remove_escape(tables->real_name);
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hf@deer.(none) committed
2785 2786
#ifndef NO_EMBEDDED_ACCESS_CHECKS
      if (check_access(thd,SELECT_ACL | EXTRA_ACL,db,&thd->col_access,0,0))
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bk@work.mysql.com committed
2787 2788 2789 2790
	goto error;				/* purecov: inspected */
      tables->grant.privilege=thd->col_access;
      if (grant_option && check_grant(thd,SELECT_ACL,tables,2))
	goto error;
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hf@deer.(none) committed
2791
#endif
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bk@work.mysql.com committed
2792
      res= mysqld_show_fields(thd,tables,
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monty@donna.mysql.com committed
2793 2794
			      (lex->wild ? lex->wild->ptr() : NullS),
			      lex->verbose);
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bk@work.mysql.com committed
2795 2796 2797 2798 2799
      break;
    }
#endif
  case SQLCOM_SHOW_KEYS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
2800
    send_error(thd,ER_NOT_ALLOWED_COMMAND);	/* purecov: inspected */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2801 2802 2803
    DBUG_VOID_RETURN;
#else
    {
2804
      char *db=tables->db;
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bk@work.mysql.com committed
2805 2806
      if (!db)
      {
2807
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: inspected */
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bk@work.mysql.com committed
2808 2809 2810
	goto error;				/* purecov: inspected */
      }
      remove_escape(db);			// Fix escaped '_'
2811
      remove_escape(tables->real_name);
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bk@work.mysql.com committed
2812 2813
      if (!tables->db)
	tables->db=thd->db;
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hf@deer.(none) committed
2814 2815
#ifndef NO_EMBEDDED_ACCESS_CHECKS
      if (check_access(thd,SELECT_ACL,db,&thd->col_access,0,0))
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bk@work.mysql.com committed
2816 2817 2818 2819
	goto error; /* purecov: inspected */
      tables->grant.privilege=thd->col_access;
      if (grant_option && check_grant(thd,SELECT_ACL,tables,2))
	goto error;
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hf@deer.(none) committed
2820
#endif
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bk@work.mysql.com committed
2821 2822 2823 2824 2825
      res= mysqld_show_keys(thd,tables);
      break;
    }
#endif
  case SQLCOM_CHANGE_DB:
2826
    mysql_change_db(thd,select_lex->db);
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bk@work.mysql.com committed
2827
    break;
2828

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bk@work.mysql.com committed
2829 2830
  case SQLCOM_LOAD:
  {
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hf@deer.(none) committed
2831
#ifndef NO_EMBEDDED_ACCESS_CHECKS
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bk@work.mysql.com committed
2832
    uint privilege= (lex->duplicates == DUP_REPLACE ?
2833
		     INSERT_ACL | DELETE_ACL : INSERT_ACL);
2834 2835

    if (!lex->local_file)
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bk@work.mysql.com committed
2836
    {
hf@deer.(none)'s avatar
hf@deer.(none) committed
2837
      if (check_access(thd,privilege | FILE_ACL,tables->db,0,0,0))
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bk@work.mysql.com committed
2838 2839 2840 2841
	goto error;
    }
    else
    {
2842
      if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
2843
	  ! opt_local_infile)
2844
      {
2845
	send_error(thd,ER_NOT_ALLOWED_COMMAND);
2846 2847
	goto error;
      }
hf@deer.(none)'s avatar
hf@deer.(none) committed
2848
      if (check_access(thd,privilege,tables->db,&tables->grant.privilege,0,0) ||
2849
	  grant_option && check_grant(thd,privilege,tables))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2850 2851
	goto error;
    }
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hf@deer.(none) committed
2852
#endif /*NO_EMBEDDED_ACCESS_CHECKS*/
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bk@work.mysql.com committed
2853 2854 2855 2856
    res=mysql_load(thd, lex->exchange, tables, lex->field_list,
		   lex->duplicates, (bool) lex->local_file, lex->lock_option);
    break;
  }
2857

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2858
  case SQLCOM_SET_OPTION:
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hf@deer.(none) committed
2859
    if (tables && ((res= check_table_access(thd, SELECT_ACL, tables,0)) ||
2860 2861 2862 2863
		   (res= open_and_lock_tables(thd,tables))))
      break;
    fix_tables_pointers(lex->all_selects_list);
    if (!(res= sql_set_variables(thd, &lex->var_list)))
2864
      send_ok(thd);
2865 2866
    if (thd->net.report_error)
      res= -1;
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bk@work.mysql.com committed
2867
    break;
2868

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bk@work.mysql.com committed
2869
  case SQLCOM_UNLOCK_TABLES:
2870
    unlock_locked_tables(thd);
2871 2872
    if (thd->options & OPTION_TABLE_LOCK)
    {
2873
      end_active_trans(thd);
2874
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2875 2876
    }
    if (thd->global_read_lock)
2877
      unlock_global_read_lock(thd);
2878
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2879 2880
    break;
  case SQLCOM_LOCK_TABLES:
2881
    unlock_locked_tables(thd);
2882
    if (check_db_used(thd,tables) || end_active_trans(thd))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2883
      goto error;
hf@deer.(none)'s avatar
hf@deer.(none) committed
2884
    if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, tables,0))
2885
      goto error;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2886
    thd->in_lock_tables=1;
2887
    thd->options|= OPTION_TABLE_LOCK;
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bk@work.mysql.com committed
2888 2889 2890 2891
    if (!(res=open_and_lock_tables(thd,tables)))
    {
      thd->locked_tables=thd->lock;
      thd->lock=0;
2892
      send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2893
    }
2894 2895
    else
      thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
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bk@work.mysql.com committed
2896 2897 2898
    thd->in_lock_tables=0;
    break;
  case SQLCOM_CREATE_DB:
2899
  {
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2900
    if (!strip_sp(lex->name) || check_db_name(lex->name))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2901
    {
2902
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2903 2904
      break;
    }
2905 2906 2907 2908 2909 2910 2911
    /*
      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.
    */
2912
#ifdef HAVE_REPLICATION
2913 2914 2915
    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
2916 2917
    {
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
2918
      break;
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guilhem@mysql.com committed
2919
    }
2920
#endif
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hf@deer.(none) committed
2921
    if (check_access(thd,CREATE_ACL,lex->name,0,1,0))
2922
      break;
2923
    res=mysql_create_db(thd,lex->name,&lex->create_info,0);
2924 2925
    break;
  }
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bk@work.mysql.com committed
2926
  case SQLCOM_DROP_DB:
2927
  {
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2928
    if (!strip_sp(lex->name) || check_db_name(lex->name))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
2929
    {
2930
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
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bk@work.mysql.com committed
2931 2932
      break;
    }
2933 2934 2935 2936 2937 2938 2939
    /*
      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.
    */
2940
#ifdef HAVE_REPLICATION
2941 2942 2943
    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
2944 2945
    {
      my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
2946
      break;
guilhem@mysql.com's avatar
guilhem@mysql.com committed
2947
    }
2948
#endif
hf@deer.(none)'s avatar
hf@deer.(none) committed
2949
    if (check_access(thd,DROP_ACL,lex->name,0,1,0))
2950
      break;
2951 2952
    if (thd->locked_tables || thd->active_transaction())
    {
2953
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
2954 2955
      goto error;
    }
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2956
    res=mysql_rm_db(thd,lex->name,lex->drop_if_exists,0);
2957 2958
    break;
  }
2959 2960 2961 2962
  case SQLCOM_ALTER_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
2963
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
2964 2965
      break;
    }
hf@deer.(none)'s avatar
hf@deer.(none) committed
2966
    if (check_access(thd,ALTER_ACL,lex->name,0,1,0))
2967 2968 2969
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
2970
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
2971 2972
      goto error;
    }
2973
    res=mysql_alter_db(thd,lex->name,&lex->create_info);
2974 2975
    break;
  }
2976 2977 2978 2979
  case SQLCOM_SHOW_CREATE_DB:
  {
    if (!strip_sp(lex->name) || check_db_name(lex->name))
    {
2980
      net_printf(thd,ER_WRONG_DB_NAME, lex->name);
2981 2982
      break;
    }
hf@deer.(none)'s avatar
hf@deer.(none) committed
2983
    if (check_access(thd,DROP_ACL,lex->name,0,1,0))
2984 2985 2986
      break;
    if (thd->locked_tables || thd->active_transaction())
    {
2987
      send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
2988 2989
      goto error;
    }
2990
    res=mysqld_show_create_db(thd,lex->name,&lex->create_info);
2991 2992
    break;
  }
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bk@work.mysql.com committed
2993
  case SQLCOM_CREATE_FUNCTION:
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hf@deer.(none) committed
2994
    if (check_access(thd,INSERT_ACL,"mysql",0,1,0))
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bk@work.mysql.com committed
2995 2996 2997
      break;
#ifdef HAVE_DLOPEN
    if (!(res = mysql_create_function(thd,&lex->udf)))
2998
      send_ok(thd);
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bk@work.mysql.com committed
2999 3000 3001 3002 3003
#else
    res= -1;
#endif
    break;
  case SQLCOM_DROP_FUNCTION:
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hf@deer.(none) committed
3004
    if (check_access(thd,DELETE_ACL,"mysql",0,1,0))
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bk@work.mysql.com committed
3005 3006
      break;
#ifdef HAVE_DLOPEN
3007
    if (!(res = mysql_drop_function(thd,&lex->udf.name)))
3008
      send_ok(thd);
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bk@work.mysql.com committed
3009 3010 3011 3012
#else
    res= -1;
#endif
    break;
hf@deer.(none)'s avatar
hf@deer.(none) committed
3013
#ifndef NO_EMBEDDED_ACCESS_CHECKS
3014 3015
  case SQLCOM_DROP_USER:
  {
hf@deer.(none)'s avatar
hf@deer.(none) committed
3016
    if (check_access(thd, GRANT_ACL,"mysql",0,1,0))
3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031
      break;
    if (!(res= mysql_drop_user(thd, lex->users_list)))
    {
      mysql_update_log.write(thd, thd->query, thd->query_length);
      if (mysql_bin_log.is_open())
      {
	Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
	mysql_bin_log.write(&qinfo);
      }
      send_ok(thd);
    }
    break;
  }
  case SQLCOM_REVOKE_ALL:
  {
hf@deer.(none)'s avatar
hf@deer.(none) committed
3032
    if (check_access(thd, GRANT_ACL ,"mysql",0,1,0))
3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045
      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;
  }
3046 3047 3048 3049 3050 3051
  case SQLCOM_REVOKE:
  case SQLCOM_GRANT:
  {
    if (check_access(thd, lex->grant | lex->grant_tot_col | GRANT_ACL,
		     tables && tables->db ? tables->db : select_lex->db,
		     tables ? &tables->grant.privilege : 0,
hf@deer.(none)'s avatar
hf@deer.(none) committed
3052
		     tables ? 0 : 1,0))
3053 3054
      goto error;

3055 3056 3057 3058
    /*
      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
    */
3059 3060 3061 3062 3063 3064 3065 3066 3067 3068

    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 &&
3069
	     my_strcasecmp(&my_charset_latin1,
3070
                           user->host.str, thd->host_or_ip)))
3071
	{
hf@deer.(none)'s avatar
hf@deer.(none) committed
3072
	  if (check_access(thd, UPDATE_ACL, "mysql",0,1,0))
3073 3074 3075 3076 3077 3078 3079 3080 3081 3082 3083 3084
	    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
3085 3086 3087
      if (!(res = mysql_table_grant(thd,tables,lex->users_list, lex->columns,
				    lex->grant,
				    lex->sql_command == SQLCOM_REVOKE)))
3088
      {
3089
	mysql_update_log.write(thd, thd->query, thd->query_length);
3090 3091
	if (mysql_bin_log.is_open())
	{
3092
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
3093 3094 3095 3096 3097 3098 3099 3100
	  mysql_bin_log.write(&qinfo);
	}
      }
    }
    else
    {
      if (lex->columns.elements)
      {
3101
	send_error(thd,ER_ILLEGAL_GRANT_FOR_TABLE);
3102 3103 3104 3105 3106 3107 3108
	res=1;
      }
      else
	res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
			  lex->sql_command == SQLCOM_REVOKE);
      if (!res)
      {
3109
	mysql_update_log.write(thd, thd->query, thd->query_length);
3110 3111
	if (mysql_bin_log.is_open())
	{
3112
	  Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
3113 3114
	  mysql_bin_log.write(&qinfo);
	}
3115
	if (mqh_used && lex->sql_command == SQLCOM_GRANT)
3116
	{
3117 3118 3119
	  List_iterator <LEX_USER> str_list(lex->users_list);
	  LEX_USER *user;
	  while ((user=str_list++))
3120
	    reset_mqh(thd,user);
3121
	}
3122 3123 3124 3125
      }
    }
    break;
  }
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
3126
#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/
monty@donna.mysql.com's avatar
monty@donna.mysql.com committed
3127
  case SQLCOM_RESET:
3128 3129 3130 3131 3132 3133 3134
    /* 
       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:
  {
3135
    if (check_global_access(thd,RELOAD_ACL) || check_db_used(thd, tables))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3136
      goto error;
3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160
    /*
      reload_acl_and_cache() will tell us if we are allowed to write to the
      binlog or not.
    */
    bool write_to_binlog;
    if (reload_acl_and_cache(thd, lex->type, tables, &write_to_binlog))
      send_error(thd, 0);
    else
    {
      /*
        We WANT to write and we CAN write.
        ! we write after unlocking the table.
      */
      if (!lex->no_write_to_binlog && write_to_binlog)
      {
        mysql_update_log.write(thd, thd->query, thd->query_length);
        if (mysql_bin_log.is_open())
        {
          Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
          mysql_bin_log.write(&qinfo);
        }
      }
      send_ok(thd);
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3161
    break;
3162
  }
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bk@work.mysql.com committed
3163 3164 3165
  case SQLCOM_KILL:
    kill_one_thread(thd,lex->thread_id);
    break;
hf@deer.(none)'s avatar
hf@deer.(none) committed
3166
#ifndef NO_EMBEDDED_ACCESS_CHECKS
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3167 3168
  case SQLCOM_SHOW_GRANTS:
    res=0;
3169 3170
    if ((thd->priv_user &&
	 !strcmp(thd->priv_user,lex->grant_user->user.str)) ||
hf@deer.(none)'s avatar
hf@deer.(none) committed
3171
	!check_access(thd, SELECT_ACL, "mysql",0,1,0))
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bk@work.mysql.com committed
3172 3173 3174 3175
    {
      res = mysql_show_grants(thd,lex->grant_user);
    }
    break;
hf@deer.(none)'s avatar
hf@deer.(none) committed
3176
#endif
3177
  case SQLCOM_HA_OPEN:
3178
    if (check_db_used(thd,tables) ||
hf@deer.(none)'s avatar
hf@deer.(none) committed
3179
	check_table_access(thd,SELECT_ACL, tables,0))
3180 3181 3182 3183 3184 3185 3186 3187 3188
      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:
3189 3190 3191 3192 3193
    /*
      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
3194
    if (check_db_used(thd,tables))
3195
      goto error;
serg@serg.mysql.com's avatar
serg@serg.mysql.com committed
3196
    res = mysql_ha_read(thd, tables, lex->ha_read_mode, lex->backup_dir,
3197 3198
			lex->insert_list, lex->ha_rkey_mode, select_lex->where,
			select_lex->select_limit, select_lex->offset_limit);
3199 3200
    break;

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3201
  case SQLCOM_BEGIN:
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
3202 3203 3204 3205 3206 3207
    if (thd->locked_tables)
    {
      thd->lock=thd->locked_tables;
      thd->locked_tables=0;			// Will be automaticly closed
      close_thread_tables(thd);			// Free tables
    }
3208 3209 3210 3211 3212 3213
    if (end_active_trans(thd))
    {
      res= -1;
    }
    else
    {
3214
      thd->options= ((thd->options & (ulong) ~(OPTION_STATUS_NO_TRANS_UPDATE)) |
3215 3216
		     OPTION_BEGIN);
      thd->server_status|= SERVER_STATUS_IN_TRANS;
3217
      send_ok(thd);
3218
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3219 3220
    break;
  case SQLCOM_COMMIT:
3221 3222 3223 3224 3225
    /*
      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
3226
  {
3227
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3228 3229
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    if (!ha_commit(thd))
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3230
    {
3231
      send_ok(thd);
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3232
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3233 3234 3235
    else
      res= -1;
    break;
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3236
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3237 3238 3239
  case SQLCOM_ROLLBACK:
    thd->server_status&= ~SERVER_STATUS_IN_TRANS;
    if (!ha_rollback(thd))
3240
    {
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3241 3242 3243 3244 3245 3246 3247 3248 3249 3250
      /*
        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)
3251
	send_warning(thd,ER_WARNING_NOT_COMPLETE_ROLLBACK,0);
3252
      else
3253
	send_ok(thd);
3254
    }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3255 3256
    else
      res= -1;
3257
    thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3258
    break;
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3259 3260 3261
  case SQLCOM_ROLLBACK_TO_SAVEPOINT:
    if (!ha_rollback_to_savepoint(thd, lex->savepoint_name))
    {
guilhem@mysql.com's avatar
guilhem@mysql.com committed
3262
      if ((thd->options & OPTION_STATUS_NO_TRANS_UPDATE) && !thd->slave_thread)
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
3263
	send_warning(thd, ER_WARNING_NOT_COMPLETE_ROLLBACK, 0);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3264
      else
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
3265
	send_ok(thd);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3266 3267 3268 3269
    }
    else
      res= -1;
    break;
3270
  case SQLCOM_SAVEPOINT:
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3271
    if (!ha_savepoint(thd, lex->savepoint_name))
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
3272
      send_ok(thd);
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
3273 3274
    else
      res= -1;
3275
    break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3276
  default:					/* Impossible */
3277
    send_ok(thd);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3278 3279 3280 3281
    break;
  }
  thd->proc_info="query end";			// QQ
  if (res < 0)
3282
    send_error(thd,thd->killed ? ER_SERVER_SHUTDOWN : 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3283 3284 3285 3286 3287 3288

error:
  DBUG_VOID_RETURN;
}


hf@deer.(none)'s avatar
hf@deer.(none) committed
3289
#ifndef NO_EMBEDDED_ACCESS_CHECKS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3290 3291 3292 3293
/*
  Check grants for commands which work only with one table and all other
  tables belong to subselects.

3294
  SYNOPSIS
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305
    single_table_command_access()
    thd - Thread handler
    privilege - asked privelage
    tables - table list of command
    res - pointer on result code variable

  RETURN
    0 - OK
    1 - access denied
*/

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3306
static bool single_table_command_access(THD *thd, ulong privilege,
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3307 3308 3309
					TABLE_LIST *tables, int *res)
					 
{
hf@deer.(none)'s avatar
hf@deer.(none) committed
3310
    if (check_access(thd, privilege, tables->db, &tables->grant.privilege,0,0))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3311 3312 3313 3314 3315 3316 3317 3318 3319
      return 1;

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

    // check rights on tables of subselect (if exists)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3320 3321 3322
    if (subselects_tables)
    {
      tables->next= subselects_tables;
hf@deer.(none)'s avatar
hf@deer.(none) committed
3323
      if ((*res= check_table_access(thd, SELECT_ACL, subselects_tables,0)))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3324 3325
	return 1;
    }
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
3326 3327 3328 3329
    return 0;
}


bk@work.mysql.com's avatar
bk@work.mysql.com committed
3330
/****************************************************************************
3331
  Get the user (global) and database privileges for all used tables
3332 3333 3334 3335 3336 3337 3338 3339 3340 3341 3342 3343 3344

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

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

    save_priv	In this we store global and db level grants for the table
		Note that we don't store db level grants if the global grants
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
3345 3346
                is enough to satisfy the request and the global grants contains
                a SELECT grant.
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3347 3348 3349
****************************************************************************/

bool
3350
check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
3351
	     bool dont_check_global_grants, bool no_errors)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3352
{
3353 3354 3355 3356
  DBUG_ENTER("check_access");
  DBUG_PRINT("enter",("want_access: %lu  master_access: %lu", want_access,
		      thd->master_access));
  ulong db_access,dummy;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3357 3358 3359 3360 3361
  if (save_priv)
    *save_priv=0;
  else
    save_priv= &dummy;

3362
  if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3363
  {
3364
    if (!no_errors)
3365
      send_error(thd,ER_NO_DB_ERROR);	/* purecov: tested */
3366
    DBUG_RETURN(TRUE);				/* purecov: tested */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3367 3368 3369 3370
  }

  if ((thd->master_access & want_access) == want_access)
  {
3371 3372 3373 3374 3375 3376 3377 3378 3379
    /*
      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,
3380
			thd->priv_user, db, test(want_access & GRANT_ACL));
3381
    *save_priv=thd->master_access | db_access;
3382
    DBUG_RETURN(FALSE);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3383
  }
3384
  if (((want_access & ~thd->master_access) & ~(DB_ACLS | EXTRA_ACL)) ||
3385
      ! db && dont_check_global_grants)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3386
  {						// We can never grant this
3387
    if (!no_errors)
3388
      net_printf(thd,ER_ACCESS_DENIED_ERROR,
3389
		 thd->priv_user,
3390
		 thd->priv_host,
3391
		 thd->password ? ER(ER_YES) : ER(ER_NO));/* purecov: tested */
3392
    DBUG_RETURN(TRUE);				/* purecov: tested */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3393 3394 3395
  }

  if (db == any_db)
3396
    DBUG_RETURN(FALSE);				// Allow select on anything
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
3397

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3398 3399
  if (db && (!thd->db || strcmp(db,thd->db)))
    db_access=acl_get(thd->host, thd->ip, (char*) &thd->remote.sin_addr,
3400
		      thd->priv_user, db, test(want_access & GRANT_ACL));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3401 3402
  else
    db_access=thd->db_access;
3403 3404
  // Remove SHOW attribute and access rights we already have
  want_access &= ~(thd->master_access | EXTRA_ACL);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3405
  db_access= ((*save_priv=(db_access | thd->master_access)) & want_access);
3406 3407

  /* grant_option is set if there exists a single table or column grant */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3408
  if (db_access == want_access ||
3409 3410
      ((grant_option && !dont_check_global_grants) &&
       !(want_access & ~TABLE_ACLS)))
3411
    DBUG_RETURN(FALSE);				/* Ok */
3412
  if (!no_errors)
3413
    net_printf(thd,ER_DBACCESS_DENIED_ERROR,
3414
	       thd->priv_user,
3415
	       thd->priv_host,
3416
	       db ? db : thd->db ? thd->db : "unknown"); /* purecov: tested */
3417
  DBUG_RETURN(TRUE);				/* purecov: tested */
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3418 3419 3420
}


3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438
/*
  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
*/
3439 3440

bool check_global_access(THD *thd, ulong want_access)
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
3441
{
3442
  char command[128];
3443
  if ((thd->master_access & want_access))
3444 3445
    return 0;
  get_privilege_desc(command, sizeof(command), want_access);
3446
  net_printf(thd,ER_SPECIFIC_ACCESS_DENIED_ERROR,
3447 3448
	     command);
  return 1;
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
3449 3450 3451
}


bk@work.mysql.com's avatar
bk@work.mysql.com committed
3452
/*
3453 3454
  Check the privilege for all used tables.  Table privileges are cached
  in the table list for GRANT checking
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3455 3456
*/

3457
bool
3458
check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables,
3459
		   bool no_errors)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3460
{
3461 3462
  uint found=0;
  ulong found_access=0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3463 3464 3465
  TABLE_LIST *org_tables=tables;
  for (; tables ; tables=tables->next)
  {
3466
    if (tables->derived || (tables->table && (int)tables->table->tmp_table))
Sinisa@sinisa.nasamreza.org's avatar
Sinisa@sinisa.nasamreza.org committed
3467
      continue;
3468 3469
    if ((thd->master_access & want_access) == (want_access & ~EXTRA_ACL) &&
	thd->db)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3470
      tables->grant.privilege= want_access;
3471
    else if (tables->db && tables->db == thd->db)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3472 3473 3474 3475 3476
    {
      if (found && !grant_option)		// db already checked
	tables->grant.privilege=found_access;
      else
      {
3477 3478
	if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
			 0, no_errors))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3479 3480
	  return TRUE;				// Access denied
	found_access=tables->grant.privilege;
3481
	found=1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3482 3483
      }
    }
3484
    else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
3485
			  0, no_errors))
3486
      return TRUE;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
3487 3488
  }
  if (grant_option)
3489
    return check_grant(thd,want_access & ~EXTRA_ACL,org_tables,
3490
		       test(want_access & EXTRA_ACL), no_errors);
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  return FALSE;
}

3494 3495
static bool check_merge_table_access(THD *thd, char *db,
				     TABLE_LIST *table_list)
3496 3497 3498 3499
{
  int error=0;
  if (table_list)
  {
3500
    /* Check that all tables use the current database */
3501 3502
    TABLE_LIST *tmp;
    for (tmp=table_list; tmp ; tmp=tmp->next)
3503 3504 3505 3506
    {
      if (!tmp->db || !tmp->db[0])
	tmp->db=db;
    }
3507
    error=check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
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			     table_list,0);
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  }
  return error;
}

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#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/

static bool check_db_used(THD *thd,TABLE_LIST *tables)
{
  for (; tables ; tables=tables->next)
  {
    if (!tables->db)
    {
      if (!(tables->db=thd->db))
      {
	send_error(thd,ER_NO_DB_ERROR);	/* purecov: tested */
	return TRUE;				/* purecov: tested */
      }
    }
  }
  return FALSE;
}
3530

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3531 3532 3533 3534 3535 3536 3537 3538 3539 3540
/****************************************************************************
	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

3541
#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));
3550
    thd->fatal_error();
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    return 1;
  }
  return 0;
}
3555
#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;
}


/****************************************************************************
3590
  Initialize global thd variables needed for query
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3591 3592
****************************************************************************/

3593
void
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mysql_init_query(THD *thd)
{
  DBUG_ENTER("mysql_init_query");
3597 3598 3599
  LEX *lex=&thd->lex;
  lex->unit.init_query();
  lex->unit.init_select();
3600
  lex->unit.thd= thd;
3601 3602 3603
  lex->select_lex.init_query();
  lex->value_list.empty();
  lex->param_list.empty();
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  lex->unit.next= lex->unit.master= 
    lex->unit.link_next= lex->unit.return_to=0;
3606
  lex->unit.prev= lex->unit.link_prev= 0;
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  lex->unit.slave= lex->unit.global_parameters= lex->current_select=
3608
    lex->all_selects_list= &lex->select_lex;
3609 3610
  lex->select_lex.master= &lex->unit;
  lex->select_lex.prev= &lex->unit.slave;
3611
  lex->select_lex.link_next= lex->select_lex.slave= lex->select_lex.next= 0;
3612
  lex->select_lex.link_prev= (st_select_lex_node**)&(lex->all_selects_list);
3613 3614
  lex->describe= 0;
  lex->derived_tables= FALSE;
3615 3616
  lex->lock_option= TL_READ;
  lex->found_colon= 0;
3617
  lex->safe_to_cache_query= 1;
3618
  thd->select_number= lex->select_lex.select_number= 1;
3619
  thd->free_list= 0;
3620
  thd->total_warn_count=0;			// Warnings for this query
3621 3622
  thd->last_insert_id_used= thd->query_start_used= thd->insert_id_used=0;
  thd->sent_row_count= thd->examined_row_count= 0;
3623
  thd->is_fatal_error= thd->rand_used= 0;
3624
  thd->server_status &= ~SERVER_MORE_RESULTS_EXISTS;
3625
  thd->tmp_table_used= 0;
3626 3627
  if (opt_bin_log)
    reset_dynamic(&thd->user_var_events);
3628
  thd->clear_error();
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  DBUG_VOID_RETURN;
}

3632

3633 3634 3635
void
mysql_init_select(LEX *lex)
{
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3636
  SELECT_LEX *select_lex= lex->current_select;
3637
  select_lex->init_select();
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3638
  select_lex->select_limit= lex->thd->variables.select_limit;
3639 3640 3641 3642 3643 3644
  if (select_lex == &lex->select_lex)
  {
    lex->exchange= 0;
    lex->result= 0;
    lex->proc_list.first= 0;
  }
3645 3646
}

3647

3648
bool
3649
mysql_new_select(LEX *lex, bool move_down)
3650
{
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3651
  SELECT_LEX *select_lex = new(&lex->thd->mem_root) SELECT_LEX();
3652 3653
  if (!select_lex)
    return 1;
3654
  select_lex->select_number= ++lex->thd->select_number;
3655 3656 3657 3658 3659
  select_lex->init_query();
  select_lex->init_select();
  if (move_down)
  {
    /* first select_lex of subselect or derived table */
3660
    SELECT_LEX_UNIT *unit= new(&lex->thd->mem_root) SELECT_LEX_UNIT();
3661 3662 3663 3664
    if (!unit)
      return 1;
    unit->init_query();
    unit->init_select();
3665
    unit->thd= lex->thd;
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3666
    unit->include_down(lex->current_select);
3667 3668
    unit->link_next= 0;
    unit->link_prev= 0;
3669
    unit->return_to= lex->current_select;
3670
    select_lex->include_down(unit);
3671
    // TODO: assign resolve_mode for fake subquery after merging with new tree
3672 3673
  }
  else
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  {
3675
    select_lex->include_neighbour(lex->current_select);
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    SELECT_LEX_UNIT *unit= select_lex->master_unit();
    SELECT_LEX *fake= unit->fake_select_lex;
    if (!fake)
    {
      /*
	as far as we included SELECT_LEX for UNION unit should have
	fake SELECT_LEX for UNION processing
      */
3684
      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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3693

3694
  select_lex->master_unit()->global_parameters= select_lex;
3695
  select_lex->include_global((st_select_lex_node**)&lex->all_selects_list);
3696
  lex->current_select= select_lex;
3697
  select_lex->resolve_mode= SELECT_LEX::SELECT_MODE;
3698
  return 0;
3699
}
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/*
  Create a select to return the same output as 'SELECT @@var_name'.

  SYNOPSIS
    create_select_for_variable()
    var_name		Variable name

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

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

void create_select_for_variable(const char *var_name)
{
3716
  THD *thd;
3717
  LEX *lex;
3718
  LEX_STRING tmp, null_lex_string;
3719
  DBUG_ENTER("create_select_for_variable");
3720 3721 3722

  thd= current_thd;
  lex= &thd->lex;
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  mysql_init_select(lex);
  lex->sql_command= SQLCOM_SELECT;
  tmp.str= (char*) var_name;
  tmp.length=strlen(var_name);
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  bzero((char*) &null_lex_string.str, sizeof(null_lex_string));
  add_item_to_list(thd, get_system_var(thd, OPT_SESSION, tmp,
				       null_lex_string));
3730 3731 3732
  DBUG_VOID_RETURN;
}

3733

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void mysql_init_multi_delete(LEX *lex)
{
3736
  lex->sql_command=  SQLCOM_DELETE_MULTI;
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  mysql_init_select(lex);
3738
  lex->select_lex.select_limit= lex->unit.select_limit_cnt=
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    HA_POS_ERROR;
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  lex->select_lex.table_list.save_and_clear(&lex->auxilliary_table_list);
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}
3742

3743

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3744
void
3745
mysql_parse(THD *thd, char *inBuf, uint length)
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{
  DBUG_ENTER("mysql_parse");

  mysql_init_query(thd);
3750
  if (query_cache_send_result_to_client(thd, inBuf, length) <= 0)
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3751 3752
  {
    LEX *lex=lex_start(thd, (uchar*) inBuf, length);
3753
    if (!yyparse((void *)thd) && ! thd->is_fatal_error)
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    {
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
3756
      if (mqh_used && thd->user_connect &&
3757
	  check_mqh(thd, lex->sql_command))
3758 3759 3760 3761
      {
	thd->net.error = 0;
      }
      else
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#endif
3763
      {
3764 3765 3766 3767 3768
	if (thd->net.report_error)
	  send_error(thd, 0, NullS);
	else
	{
	  mysql_execute_command(thd);
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SCRUM  
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3769
#ifndef EMBEDDED_LIBRARY  /* TODO query cache in embedded library*/
3770
	  query_cache_end_of_result(&thd->net);
3771
#endif
3772
	}
3773
      }
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    }
    else
3776 3777
    {
      DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
3778
			 thd->is_fatal_error));
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SCRUM  
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3779
#ifndef EMBEDDED_LIBRARY   /* TODO query cache in embedded library*/
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      query_cache_abort(&thd->net);
3781
#endif
3782
    }
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3783
    thd->proc_info="freeing items";
3784
    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,
3798
		       uint type_modifier,
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		       Item *default_value, LEX_STRING *comment,
3800 3801
		       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;
3806
  char warn_buff[MYSQL_ERRMSG_SIZE];
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  DBUG_ENTER("add_field_to_list");

  if (strlen(field_name) > NAME_LEN)
  {
3811
    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));
3817
    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));
3824
    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();
  }

3829
  if (default_value)
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3830
  {
3831
    if (default_value->type() == Item::NULL_ITEM)
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3832
    {
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      default_value=0;
      if ((type_modifier & (NOT_NULL_FLAG | AUTO_INCREMENT_FLAG)) ==
	  NOT_NULL_FLAG)
      {
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3837
	net_printf(thd,ER_INVALID_DEFAULT,field_name);
3838 3839 3840 3841 3842
	DBUG_RETURN(1);
      }
    }
    else if (type_modifier & AUTO_INCREMENT_FLAG)
    {
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3843
      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;
3851
  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;
3862
  new_field->charset=cs;
3863
  new_field->geom_type= (Field::geometry_type) uint_geom_type;
3864

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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;
3875
  }
3876 3877
  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 &&
3881
      new_field->length < new_field->decimals+1 &&
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3882
      new_field->decimals != NOT_FIXED_DEC)
3883
    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)
3910 3911 3912 3913 3914 3915 3916
      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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3917
    break;
3918 3919
  case FIELD_TYPE_STRING:
  case FIELD_TYPE_VAR_STRING:
3920
    if (new_field->length <= MAX_FIELD_CHARLENGTH || default_value)
3921 3922 3923 3924
      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",
3925
	    (cs == &my_charset_bin) ? "BLOB" : "TEXT");
3926 3927 3928
    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:
3933
  case FIELD_TYPE_GEOMETRY:
3934 3935 3936 3937 3938 3939 3940 3941 3942 3943 3944 3945 3946 3947
    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())
      {
3954
	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)
      {
3974
	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)
      {
4028
	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++)
4037 4038 4039
      {
	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)
      {
4044 4045
	char *not_used;
	uint not_used2;
4046
  bool not_used3;
4047

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	thd->cuted_fields=0;
	String str,*res;
	res=default_value->val_str(&str);
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	(void) find_set(interval, res->ptr(), res->length(), &not_used,
4052
			&not_used2, &not_used3);
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	if (thd->cuted_fields)
	{
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	  net_printf(thd,ER_INVALID_DEFAULT,field_name);
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	  DBUG_RETURN(1);
	}
      }
    }
    break;
  case FIELD_TYPE_ENUM:
    {
      new_field->interval=interval;
      new_field->pack_length=interval->count < 256 ? 1 : 2; // Should be safe
4065
      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()))
	{
4078
	  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,
4093
	       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)
  {
4099
    net_printf(thd,ER_WRONG_FIELD_SPEC,field_name);
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    DBUG_RETURN(1);
  }
  if (!new_field->pack_length)
    new_field->pack_length=calc_pack_length(new_field->sql_type ==
					    FIELD_TYPE_VAR_STRING ?
					    FIELD_TYPE_STRING :
					    new_field->sql_type,
					    new_field->length);
  lex->create_list.push_back(new_field);
  lex->last_field=new_field;
  DBUG_RETURN(0);
}

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

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

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

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


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

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

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


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bool add_to_list(THD *thd, SQL_LIST &list,Item *item,bool asc)
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{
  ORDER *order;
  Item	**item_ptr;
  DBUG_ENTER("add_to_list");
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  if (!(order = (ORDER *) thd->alloc(sizeof(ORDER)+sizeof(Item*))))
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    DBUG_RETURN(1);
  item_ptr = (Item**) (order+1);
  *item_ptr=item;
  order->item= item_ptr;
  order->asc = asc;
  order->free_me=0;
  order->used=0;
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  list.link_in_list((byte*) order,(byte**) &order->next);
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  DBUG_RETURN(0);
}


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/*
  Add a table to list of used tables

  SYNOPSIS
    add_table_to_list()
    table		Table to add
    alias		alias for table (or null if no alias)
    table_options	A set of the following bits:
			TL_OPTION_UPDATING	Table will be updated
			TL_OPTION_FORCE_INDEX	Force usage of index
    lock_type		How table should be locked
    use_index		List of indexed used in USE INDEX
    ignore_index	List of indexed used in IGNORE INDEX

    RETURN
      0		Error
      #		Pointer to TABLE_LIST element added to the total table list
*/

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TABLE_LIST *st_select_lex::add_table_to_list(THD *thd,
					     Table_ident *table,
4212
					     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;
4225
  if (check_table_name(table->table.str,table->table.length) ||
4226
      table->db.str && check_db_name(table->db.str))
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  {
4228
    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);
    }
4239
    if (!(alias_str=thd->memdup(alias_str,table->table.length+1)))
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      DBUG_RETURN(0);
4241
  }
4242
  if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
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    DBUG_RETURN(0);				/* purecov: inspected */
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  if (table->db.str)
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  {
    ptr->db= table->db.str;
    ptr->db_length= table->db.length;
  }
  else if (thd->db)
  {
    ptr->db= thd->db;
    ptr->db_length= thd->db_length;
  }
  else
  {
4256 4257
    /* 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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4261
  ptr->alias= alias_str;
4262 4263
  if (lower_case_table_names && table->table.length)
    my_casedn_str(files_charset_info, table->table.str);
4264
  ptr->real_name=table->table.str;
4265
  ptr->real_name_length=table->table.length;
4266
  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);
4270
  ptr->derived=	    table->sel;
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  if (use_index)
4272
    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 */
4279
  if (lock_type != TL_IGNORE)
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  {
4281
    for (TABLE_LIST *tables=(TABLE_LIST*) table_list.first ;
4282
	 tables ;
4283
	 tables=tables->next)
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    {
4285
      if (!strcmp(alias_str,tables->alias) && !strcmp(ptr->db, tables->db))
4286
      {
4287
	net_printf(thd,ER_NONUNIQ_TABLE,alias_str); /* purecov: tested */
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	DBUG_RETURN(0);				/* purecov: tested */
      }
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    }
  }
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  table_list.link_in_list((byte*) ptr, (byte**) &ptr->next);
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  DBUG_RETURN(ptr);
}

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/*
  Set lock for all tables in current select level

  SYNOPSIS:
    set_lock_for_tables()
    lock_type			Lock to set for tables

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

4310
void st_select_lex::set_lock_for_tables(thr_lock_type lock_type)
4311 4312 4313 4314 4315 4316
{
  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));

4317
  for (TABLE_LIST *tables= (TABLE_LIST*) table_list.first ;
4318 4319 4320 4321 4322 4323 4324 4325 4326
       tables ;
       tables=tables->next)
  {
    tables->lock_type= lock_type;
    tables->updating=  for_update;
  }
  DBUG_VOID_RETURN;
}

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void add_join_on(TABLE_LIST *b,Item *expr)
{
4330
  if (expr)
4331
  {
4332 4333 4334 4335 4336 4337 4338 4339
    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();
4340
  }
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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;
}

4367
/*
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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
4385 4386
*/

4387 4388
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 */
4392
  bool tmp_write_to_binlog= 1;
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  if (options & REFRESH_GRANT)
  {
4396
    acl_reload(thd);
4397
    grant_reload(thd);
4398
    if (mqh_used)
4399
      reset_mqh(thd,(LEX_USER *) NULL,true);
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  }
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#endif
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  if (options & REFRESH_LOG)
  {
4404
    /*
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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).
4407
    */
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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);
4419
#ifdef HAVE_REPLICATION
4420
    if (expire_logs_days)
4421 4422 4423
    {
      long purge_time= time(0) - expire_logs_days*24*60*60;
      if (purge_time >= 0)
4424
	mysql_bin_log.purge_logs_before_date(purge_time);
4425
    }
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    LOCK_ACTIVE_MI;
    rotate_relay_log(active_mi);
    UNLOCK_ACTIVE_MI;
4429
#endif
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    if (ha_flush_logs())
      result=1;
4432 4433
    if (flush_error_log())
      result=1;
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  }
4435
#ifdef HAVE_QUERY_CACHE
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  if (options & REFRESH_QUERY_CACHE_FREE)
  {
4438
    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))
  {
4443
    query_cache.flush();			// RESET QUERY CACHE
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  }
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#endif /*HAVE_QUERY_CACHE*/
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  /*
    Note that if REFRESH_READ_LOCK bit is set then REFRESH_TABLES is set too
    (see sql_yacc.yy)
  */
  if (options & (REFRESH_TABLES | REFRESH_READ_LOCK)) 
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  {
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    if ((options & REFRESH_READ_LOCK) && thd)
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    {
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      /*
	Writing to the binlog could cause deadlocks, as we don't log
	UNLOCK TABLES
      */
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      tmp_write_to_binlog= 0;
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      if (lock_global_read_lock(thd))
	return 1;
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    }
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    result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1, tables);
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  }
  if (options & REFRESH_HOSTS)
    hostname_cache_refresh();
  if (options & REFRESH_STATUS)
    refresh_status();
  if (options & REFRESH_THREADS)
    flush_thread_cache();
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#ifdef HAVE_REPLICATION
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  if (options & REFRESH_MASTER)
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  {
    tmp_write_to_binlog= 0;
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    if (reset_master(thd))
      result=1;
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  }
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#endif
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#ifdef OPENSSL
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   if (options & REFRESH_DES_KEY_FILE)
   {
     if (des_key_file)
       result=load_des_key_file(des_key_file);
   }
#endif
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#ifdef HAVE_REPLICATION
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 if (options & REFRESH_SLAVE)
 {
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   tmp_write_to_binlog= 0;
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   LOCK_ACTIVE_MI;
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   if (reset_slave(thd, active_mi))
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     result=1;
   UNLOCK_ACTIVE_MI;
 }
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#endif
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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 if (options & REFRESH_USER_RESOURCES)
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   reset_mqh(thd,(LEX_USER *) NULL);
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#endif
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 if (write_to_binlog)
   *write_to_binlog= tmp_write_to_binlog;
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 return result;
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}

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/*
  kill on thread

  SYNOPSIS
    kill_one_thread()
    thd			Thread class
    id			Thread id

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

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

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

/* Clear most status variables */

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

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

  /* Check that the filename is not too long and it's a hard path */
  if (strlen(*filename_ptr)+strlen(table_name) >= FN_REFLEN-1 ||
      !test_if_hard_path(*filename_ptr))
  {
    my_error(ER_WRONG_TABLE_NAME, MYF(0), *filename_ptr);
    return 1;
  }
  /* Fix is using unix filename format on dos */
  strmov(buff,*filename_ptr);
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  end=convert_dirname(buff, *filename_ptr, NullS);
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  if (!(ptr=thd->alloc((uint) (end-buff)+(uint) strlen(table_name)+1)))
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    return 1;					// End of memory
  *filename_ptr=ptr;
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  strxmov(ptr,buff,table_name,NullS);
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  return 0;
}
4594

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/*
  Check if the select is a simple select (not an union)

  SYNOPSIS
    check_simple_select()

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

bool check_simple_select()
{
  THD *thd= current_thd;
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  if (thd->lex.current_select != &thd->lex.select_lex)
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  {
    char command[80];
    strmake(command, thd->lex.yylval->symbol.str,
	    min(thd->lex.yylval->symbol.length, sizeof(command)-1));
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    net_printf(thd, ER_CANT_USE_OPTION_HERE, command);
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    return 1;
  }
  return 0;
}
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compare_func_creator comp_eq_creator(bool invert)
{
  return invert?&Item_bool_func2::ne_creator:&Item_bool_func2::eq_creator;
}

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;
}