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mariadb/sql/sql_parse.cc
unknown 7b51154461 Support for TIMESTAMP columns holding NULL values. Unlike all other 
column types TIMESTAMP is NOT NULL by default, so in order to have 
TIMESTAMP column holding NULL valaues you have to specify NULL as
one of its attributes (this needed for backward compatibility).

Main changes:
Replaced TABLE::timestamp_default_now/on_update_now members with
TABLE::timestamp_auto_set_type flag which is used everywhere
for determining if we should auto-set value of TIMESTAMP field 
during this operation or not. We are also use Field_timestamp::set_time()
instead of handler::update_timestamp() in handlers.


mysql-test/r/type_timestamp.result:
  Added test for TIMESTAMP columns which are able to store NULL values.
mysql-test/t/type_timestamp.test:
  Added test for TIMESTAMP columns which are able to store NULL values.
sql/field.cc:
  Added support for TIMESTAMP fields holding NULL values.
  We don't need Field_timestamp::set_timestamp_offsets() anymore.
  Instead we need Field_timestamp::get_auto_set_type() function
  which will convert TIMESTAMP auto-set type stored in Field in 
  unireg_check to value from timestamp_auto_set_type_enum.
  (We can't replace this function with additional Field_timestamp member
  and some code in constructor because then we will have troubles
  with Field::new_field() method).
  We should also set field to not null in Field_timestamp::set_time() now.
sql/field.h:
  Added support for TIMESTAMP fields holding NULL values.
  We don't need Field_timestamp::set_timestamp_offsets() anymore.
  Instead we need Field_timestamp::get_auto_set_type() function,
  which will convert TIMESTAMP auto-set type stored in Field in 
  unireg_check to value from timestamp_auto_set_type_enum.
  We also have to support NULL values in Field_timestamp::get_timestamp()
  function.
sql/field_conv.cc:
  Added comment clarifying behavior in case of TIMESTAMP fields which are
  able to store NULL values.
sql/ha_berkeley.cc:
  Now we use TABLE::timestamp_field_type instead of 
  TABLE::timestamp_default_now/on_update_now for determining 
  if we should auto-set value of TIMESTAMP field during this operation.
  We are also use Field_timestamp::set_time() instead of 
  handler::update_timestamp().
sql/ha_heap.cc:
  Now we use TABLE::timestamp_field_type instead of 
  TABLE::timestamp_default_now/on_update_now for determining 
  if we should auto-set value of TIMESTAMP field during this operation.
  We are also use Field_timestamp::set_time() instead of 
  handler::update_timestamp().
sql/ha_innodb.cc:
  Now we use TABLE::timestamp_field_type instead of 
  TABLE::timestamp_default_now/on_update_now for determining 
  if we should auto-set value of TIMESTAMP field during this operation.
  We are also use Field_timestamp::set_time() instead of 
  handler::update_timestamp().
sql/ha_isam.cc:
  Now we use TABLE::timestamp_field_type instead of 
  TABLE::timestamp_default_now/on_update_now for determining 
  if we should auto-set value of TIMESTAMP field during this operation.
  We are also use Field_timestamp::set_time() instead of 
  handler::update_timestamp().
sql/ha_isammrg.cc:
  Now we use TABLE::timestamp_field_type instead of 
  TABLE::timestamp_default_now/on_update_now for determining 
  if we should auto-set value of TIMESTAMP field during this operation.
  We are also use Field_timestamp::set_time() instead of 
  handler::update_timestamp().
sql/ha_myisam.cc:
  Now we use TABLE::timestamp_field_type instead of 
  TABLE::timestamp_default_now/on_update_now for determining 
  if we should auto-set value of TIMESTAMP field during this operation.
  We are also use Field_timestamp::set_time() instead of 
  handler::update_timestamp().
sql/ha_myisammrg.cc:
  Now we use TABLE::timestamp_field_type instead of 
  TABLE::timestamp_default_now/on_update_now for determining 
  if we should auto-set value of TIMESTAMP field during this operation.
  We are also use Field_timestamp::set_time() instead of 
  handler::update_timestamp().
sql/ha_ndbcluster.cc:
  Now we use TABLE::timestamp_field_type instead of 
  TABLE::timestamp_default_now/on_update_now for determining 
  if we should auto-set value of TIMESTAMP field during this operation.
  We are also use Field_timestamp::set_time() instead of 
  handler::update_timestamp().
sql/handler.cc:
  handler::update_timestamp() is no longer needed since now we use
  Field_timestamp::set_time() instead.
  (we can't use handler::update_timestamp() anyway since field position
  only is not enough for TIMESTAMP fields which are able to store NULLs)
sql/handler.h:
  handler::update_timestamp() is no longer needed since now we use
  Field_timestamp::set_time() instead.
sql/item_timefunc.cc:
  Since now TIMESTAMP fields can hold NULL values we should take this into
  account.
sql/sql_base.cc:
  Now we use TABLE::timestamp_field_type instead of 
  TABLE::timestamp_default_now/on_update_now. 
  (Here we use Field_timestamp::get_auto_set_type() to setup its value
   before further statement execution).
sql/sql_insert.cc:
  Now we use TABLE::timestamp_field_type instead of 
  TABLE::timestamp_default_now/on_update_now.
sql/sql_load.cc:
  Now we use TABLE::timestamp_field_type instead of 
  TABLE::timestamp_default_now/on_update_now.
sql/sql_parse.cc:
  Added support for TIMESTAMP fields holding NULL values.
  We should distinguish NULL default values and non-specified default
  values for such fields (because latter could mean DEFAULT NOW()
  ON UPDATE NOW() in some cases).
sql/sql_show.cc:
  Added support for TIMESTAMP fields holding NULL values.
  Unlike all other fields these are NOT NULL by default
  so we have to specify NULL attribute explicitly for them.
sql/sql_table.cc:
  Now we use TABLE::timestamp_field_type instead of 
  TABLE::timestamp_default_now/on_update_now.
sql/sql_update.cc:
  Now we use TABLE::timestamp_field_type instead of 
  TABLE::timestamp_default_now/on_update_now.
sql/sql_yacc.yy:
  Added support for TIMESTAMP fields holding NULL values.
  Unlike all other fields these are NOT NULL by default
  (so we have to set NOT_NULL_FLAG properly for them).
sql/table.h:
  Added timestamp_auto_set_type enum which values are used for indicating
  during which operations we should automatically set TIMESTAPM field
  value to current timestamp.
  TABLE: Replaced timestamp_default_now/on_update_now members with
  timestamp_auto_set_type flag (Now when TIMESTAMP field are able to 
  store NULL values, single position of field in record is not enough 
  for updating this field anyway).
2004-10-01 18:54:06 +04:00

5457 lines
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/* Copyright (C) 2000-2003 MySQL AB
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.
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.
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"
#include "sql_repl.h"
#include "repl_failsafe.h"
#include <m_ctype.h>
#include <myisam.h>
#include <my_dir.h>
#ifdef HAVE_INNOBASE_DB
#include "ha_innodb.h"
#endif
#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?
*/
#define SSL_HANDSHAKE_SIZE 2
#define NORMAL_HANDSHAKE_SIZE 6
#define MIN_HANDSHAKE_SIZE 2
#else
#define MIN_HANDSHAKE_SIZE 6
#endif /* HAVE_OPENSSL */
#ifdef SOLARIS
extern "C" int gethostname(char *name, int namelen);
#endif
#ifndef NO_EMBEDDED_ACCESS_CHECKS
static int check_for_max_user_connections(THD *thd, USER_CONN *uc);
#endif
static void decrease_user_connections(USER_CONN *uc);
static bool check_db_used(THD *thd,TABLE_LIST *tables);
static void remove_escape(char *name);
static void refresh_status(void);
static bool append_file_to_dir(THD *thd, const char **filename_ptr,
const char *table_name);
const char *any_db="*any*"; // Special symbol for check_access
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",
"Binlog Dump","Table Dump", "Connect Out", "Register Slave",
"Prepare", "Prepare Execute", "Long Data", "Close stmt",
"Error" // Last command number
};
static char empty_c_string[1]= {0}; // Used for not defined 'db'
#ifdef __WIN__
static void test_signal(int sig_ptr)
{
#if !defined( DBUG_OFF)
MessageBox(NULL,"Test signal","DBUG",MB_OK);
#endif
#if defined(OS2)
fprintf(stderr, "Test signal %d\n", sig_ptr);
fflush(stderr);
#endif
}
static void init_signals(void)
{
int signals[7] = {SIGINT,SIGILL,SIGFPE,SIGSEGV,SIGTERM,SIGBREAK,SIGABRT } ;
for (int i=0 ; i < 7 ; i++)
signal( signals[i], test_signal) ;
}
#endif
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)
{
int error=0;
if (thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN |
OPTION_TABLE_LOCK))
{
thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
thd->server_status&= ~SERVER_STATUS_IN_TRANS;
if (ha_commit(thd))
error=1;
}
return error;
}
#ifdef HAVE_REPLICATION
inline bool all_tables_not_ok(THD *thd, TABLE_LIST *tables)
{
return (table_rules_on && tables && !tables_ok(thd,tables) &&
((thd->lex->sql_command != SQLCOM_DELETE_MULTI) ||
!tables_ok(thd,
(TABLE_LIST *)thd->lex->auxilliary_table_list.first)));
}
#endif
static HASH hash_user_connections;
static int get_or_create_user_conn(THD *thd, const char *user,
const char *host,
USER_RESOURCES *mqh)
{
int return_val=0;
uint temp_len, user_len;
char temp_user[USERNAME_LENGTH+HOSTNAME_LENGTH+2];
struct user_conn *uc;
DBUG_ASSERT(user != 0);
DBUG_ASSERT(host != 0);
user_len=strlen(user);
temp_len= (strmov(strmov(temp_user, user)+1, host) - temp_user)+1;
(void) pthread_mutex_lock(&LOCK_user_conn);
if (!(uc = (struct user_conn *) hash_search(&hash_user_connections,
(byte*) temp_user, temp_len)))
{
/* First connection for user; Create a user connection object */
if (!(uc= ((struct user_conn*)
my_malloc(sizeof(struct user_conn) + temp_len+1,
MYF(MY_WME)))))
{
send_error(thd, 0, NullS); // Out of memory
return_val=1;
goto end;
}
uc->user=(char*) (uc+1);
memcpy(uc->user,temp_user,temp_len+1);
uc->user_len= user_len;
uc->host=uc->user + uc->user_len + 1;
uc->len = temp_len;
uc->connections = 1;
uc->questions=uc->updates=uc->conn_per_hour=0;
uc->user_resources=*mqh;
if (max_user_connections && mqh->connections > max_user_connections)
uc->user_resources.connections = max_user_connections;
uc->intime=thd->thr_create_time;
if (my_hash_insert(&hash_user_connections, (byte*) uc))
{
my_free((char*) uc,0);
send_error(thd, 0, NullS); // Out of memory
return_val=1;
goto end;
}
}
thd->user_connect=uc;
uc->connections++;
end:
(void) pthread_mutex_unlock(&LOCK_user_conn);
return return_val;
}
/*
Check if user exist and password supplied is correct.
SYNOPSIS
check_user()
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
Note, that host, user and passwd may point to communication buffer.
Current implementation does not depened on that, but future changes
should be done with this in mind; 'thd' is INOUT, all other params
are 'IN'.
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;
-1 access denied or handshake error; error is sent to client;
>0 error, not sent to client
*/
int check_user(THD *thd, enum enum_server_command command,
const char *passwd, uint passwd_len, const char *db,
bool check_count)
{
DBUG_ENTER("check_user");
#ifdef NO_EMBEDDED_ACCESS_CHECKS
thd->master_access= GLOBAL_ACLS; // Full rights
/* Change database if necessary: OK or FAIL is sent in mysql_change_db */
if (db && db[0])
{
thd->db= 0;
thd->db_length= 0;
if (mysql_change_db(thd, db))
{
if (thd->user_connect)
decrease_user_connections(thd->user_connect);
DBUG_RETURN(-1);
}
}
else
send_ok(thd);
DBUG_RETURN(0);
#else
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);
/*
If the server is running in secure auth mode, short scrambles are
forbidden.
*/
if (opt_secure_auth_local && passwd_len == SCRAMBLE_LENGTH_323)
{
net_printf(thd, ER_NOT_SUPPORTED_AUTH_MODE);
mysql_log.write(thd, COM_CONNECT, ER(ER_NOT_SUPPORTED_AUTH_MODE));
DBUG_RETURN(-1);
}
if (passwd_len != 0 &&
passwd_len != SCRAMBLE_LENGTH &&
passwd_len != SCRAMBLE_LENGTH_323)
DBUG_RETURN(ER_HANDSHAKE_ERROR);
/*
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'.
*/
thd->db= 0;
thd->db_length= 0;
USER_RESOURCES ur;
int res= acl_getroot(thd, &ur, passwd, passwd_len);
#ifndef EMBEDDED_LIBRARY
if (res == -1)
{
/*
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.
*/
NET *net= &thd->net;
if (opt_secure_auth_local)
{
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);
}
if (send_old_password_request(thd) ||
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 */
res= acl_getroot(thd, &ur, (char *) net->read_pos, SCRAMBLE_LENGTH_323);
}
#endif /*EMBEDDED_LIBRARY*/
/* here res is always >= 0 */
if (res == 0)
{
if (!(thd->master_access & NO_ACCESS)) // authentification is OK
{
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)
{
VOID(pthread_mutex_lock(&LOCK_thread_count));
bool count_ok= thread_count < max_connections + delayed_insert_threads
|| (thd->master_access & SUPER_ACL);
VOID(pthread_mutex_unlock(&LOCK_thread_count));
if (!count_ok)
{ // too many connections
send_error(thd, ER_CON_COUNT_ERROR);
DBUG_RETURN(-1);
}
}
/* 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*) "");
/*
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.
*/
thd->db_access=0;
/* Don't allow user to connect if he has done too many queries */
if ((ur.questions || ur.updates || ur.connections ||
max_user_connections) &&
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 ||
max_user_connections) &&
check_for_max_user_connections(thd, thd->user_connect))
DBUG_RETURN(-1);
/* Change database if necessary: OK or FAIL is sent in mysql_change_db */
if (db && db[0])
{
if (mysql_change_db(thd, db))
{
if (thd->user_connect)
decrease_user_connections(thd->user_connect);
DBUG_RETURN(-1);
}
}
else
send_ok(thd);
thd->password= test(passwd_len); // remember for error messages
/* Ready to handle queries */
DBUG_RETURN(0);
}
}
else if (res == 2) // client gave short hash, server has long hash
{
net_printf(thd, ER_NOT_SUPPORTED_AUTH_MODE);
mysql_log.write(thd,COM_CONNECT,ER(ER_NOT_SUPPORTED_AUTH_MODE));
DBUG_RETURN(-1);
}
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);
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
}
/*
Check for maximum allowable user connections, if the mysqld server is
started with corresponding variable that is greater then 0.
*/
extern "C" byte *get_key_conn(user_conn *buff, uint *length,
my_bool not_used __attribute__((unused)))
{
*length=buff->len;
return (byte*) buff->user;
}
extern "C" void free_user(struct user_conn *uc)
{
my_free((char*) uc,MYF(0));
}
void init_max_user_conn(void)
{
(void) hash_init(&hash_user_connections,system_charset_info,max_connections,
0,0,
(hash_get_key) get_key_conn, (hash_free_key) free_user,
0);
}
/*
check if user has already too many connections
SYNOPSIS
check_for_max_user_connections()
thd Thread handle
uc User connect object
NOTES
If check fails, we decrease user connection count, which means one
shouldn't call decrease_user_connections() after this function.
RETURN
0 ok
1 error
*/
#ifndef NO_EMBEDDED_ACCESS_CHECKS
static int check_for_max_user_connections(THD *thd, USER_CONN *uc)
{
int error=0;
DBUG_ENTER("check_for_max_user_connections");
(void) pthread_mutex_lock(&LOCK_user_conn);
if (max_user_connections &&
max_user_connections < (uint) uc->connections)
{
net_printf(thd,ER_TOO_MANY_USER_CONNECTIONS, uc->user);
error=1;
goto end;
}
if (uc->user_resources.connections &&
uc->user_resources.connections <= uc->conn_per_hour)
{
net_printf(thd, ER_USER_LIMIT_REACHED, uc->user,
"max_connections",
(long) uc->user_resources.connections);
error=1;
goto end;
}
uc->conn_per_hour++;
end:
if (error)
uc->connections--; // no need for decrease_user_connections() here
(void) pthread_mutex_unlock(&LOCK_user_conn);
DBUG_RETURN(error);
}
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
/*
Decrease user connection count
SYNOPSIS
decrease_user_connections()
uc User connection object
NOTES
If there is a n user connection object for a connection
(which only happens if 'max_user_connections' is defined or
if someone has created a resource grant for a user), then
the connection count is always incremented on connect.
The user connect object is not freed if some users has
'max connections per hour' defined as we need to be able to hold
count over the lifetime of the connection.
*/
static void decrease_user_connections(USER_CONN *uc)
{
DBUG_ENTER("decrease_user_connections");
(void) pthread_mutex_lock(&LOCK_user_conn);
DBUG_ASSERT(uc->connections);
if (!--uc->connections && !mqh_used)
{
/* Last connection for user; Delete it */
(void) hash_delete(&hash_user_connections,(byte*) uc);
}
(void) pthread_mutex_unlock(&LOCK_user_conn);
DBUG_VOID_RETURN;
}
void free_max_user_conn(void)
{
hash_free(&hash_user_connections);
}
/*
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;
uc_update_queries[SQLCOM_UPDATE_MULTI]=1;
}
bool is_update_query(enum enum_sql_command command)
{
return uc_update_queries[command];
}
/*
Check if maximum queries per hour limit has been reached
returns 0 if OK.
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.
*/
static bool check_mqh(THD *thd, uint check_command)
{
#ifdef NO_EMBEDDED_ACCESS_CHECKS
return(0);
#else
bool error=0;
time_t check_time = thd->start_time ? thd->start_time : time(NULL);
USER_CONN *uc=thd->user_connect;
DBUG_ENTER("check_mqh");
DBUG_ASSERT(uc != 0);
/* If more than a hour since last check, reset resource checking */
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);
}
/* Check that we have not done too many questions / hour */
if (uc->user_resources.questions &&
uc->questions++ >= uc->user_resources.questions)
{
net_printf(thd, ER_USER_LIMIT_REACHED, uc->user, "max_questions",
(long) uc->user_resources.questions);
error=1;
goto end;
}
if (check_command < (uint) SQLCOM_END)
{
/* 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)
{
net_printf(thd, ER_USER_LIMIT_REACHED, uc->user, "max_updates",
(long) uc->user_resources.updates);
error=1;
goto end;
}
}
end:
DBUG_RETURN(error);
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
}
static void reset_mqh(THD *thd, LEX_USER *lu, bool get_them= 0)
{
#ifndef NO_EMBEDDED_ACCESS_CHECKS
(void) pthread_mutex_lock(&LOCK_user_conn);
if (lu) // for GRANT
{
USER_CONN *uc;
uint temp_len=lu->user.length+lu->host.length+2;
char temp_user[USERNAME_LENGTH+HOSTNAME_LENGTH+2];
memcpy(temp_user,lu->user.str,lu->user.length);
memcpy(temp_user+lu->user.length+1,lu->host.str,lu->host.length);
temp_user[lu->user.length]='\0'; temp_user[temp_len-1]=0;
if ((uc = (struct user_conn *) hash_search(&hash_user_connections,
(byte*) temp_user, temp_len)))
{
uc->questions=0;
get_mqh(temp_user,&temp_user[lu->user.length+1],uc);
uc->updates=0;
uc->conn_per_hour=0;
}
}
else // for FLUSH PRIVILEGES and FLUSH USER_RESOURCES
{
for (uint idx=0;idx < hash_user_connections.records; idx++)
{
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;
}
}
(void) pthread_mutex_unlock(&LOCK_user_conn);
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
}
/*
Perform handshake, authorize client and update thd ACL variables.
SYNOPSIS
check_connection()
thd thread handle
RETURN
0 success, OK is sent to user, thd is updated.
-1 error, which is sent to user
> 0 error code (not sent to user)
*/
#ifndef EMBEDDED_LIBRARY
static int check_connection(THD *thd)
{
uint connect_errors= 0;
NET *net= &thd->net;
DBUG_PRINT("info",
("New connection received on %s", vio_description(net->vio)));
if (!thd->host) // If TCP/IP connection
{
char ip[30];
if (vio_peer_addr(net->vio, ip, &thd->peer_port))
return (ER_BAD_HOST_ERROR);
if (!(thd->ip= my_strdup(ip,MYF(0))))
return (ER_OUT_OF_RESOURCES);
thd->host_or_ip= thd->ip;
#if !defined(HAVE_SYS_UN_H) || defined(HAVE_mit_thread)
/* Fast local hostname resolve for Win32 */
if (!strcmp(thd->ip,"127.0.0.1"))
{
thd->host= (char*) my_localhost;
thd->host_or_ip= my_localhost;
}
else
#endif
{
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)
{
thd->host[min(strlen(thd->host), HOSTNAME_LENGTH)]= 0;
thd->host_or_ip= thd->host;
}
if (connect_errors > max_connect_errors)
return(ER_HOST_IS_BLOCKED);
}
}
DBUG_PRINT("info",("Host: %s ip: %s",
thd->host ? thd->host : "unknown host",
thd->ip ? thd->ip : "unknown ip"));
if (acl_check_host(thd->host,thd->ip))
return(ER_HOST_NOT_PRIVILEGED);
}
else /* Hostname given means that the connection was on a socket */
{
DBUG_PRINT("info",("Host: %s",thd->host));
thd->host_or_ip= thd->host;
thd->ip= 0;
bzero((char*) &thd->remote, sizeof(struct sockaddr));
}
vio_keepalive(net->vio, TRUE);
ulong pkt_len= 0;
char *end;
{
/* buff[] needs to big enough to hold the server_version variable */
char buff[SERVER_VERSION_LENGTH + SCRAMBLE_LENGTH + 64];
ulong client_flags = (CLIENT_LONG_FLAG | CLIENT_CONNECT_WITH_DB |
CLIENT_PROTOCOL_41 | CLIENT_SECURE_CONNECTION);
if (opt_using_transactions)
client_flags|=CLIENT_TRANSACTIONS;
#ifdef HAVE_COMPRESS
client_flags |= CLIENT_COMPRESS;
#endif /* HAVE_COMPRESS */
#ifdef HAVE_OPENSSL
if (ssl_acceptor_fd)
client_flags |= CLIENT_SSL; /* Wow, SSL is avalaible! */
#endif /* HAVE_OPENSSL */
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
tail: that's why first part of the scramble is placed here, and second
part at the end of packet.
*/
end= strmake(end, thd->scramble, SCRAMBLE_LENGTH_323) + 1;
int2store(end, client_flags);
/* write server characteristics: up to 16 bytes allowed */
end[2]=(char) default_charset_info->number;
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,
(uint) (end-buff)) ||
(pkt_len= my_net_read(net)) == packet_error ||
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);
if (thd->packet.alloc(thd->variables.net_buffer_length))
return(ER_OUT_OF_RESOURCES);
thd->client_capabilities=uint2korr(net->read_pos);
#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
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);
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
*/
if (!(thd->variables.character_set_client=
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))
{
thd->variables.character_set_client=
global_system_variables.character_set_client;
thd->variables.collation_connection=
global_system_variables.collation_connection;
thd->variables.character_set_results=
global_system_variables.character_set_results;
}
else
{
thd->variables.character_set_results=
thd->variables.collation_connection=
thd->variables.character_set_client;
}
thd->update_charset();
end= (char*) net->read_pos+32;
}
else
{
thd->max_client_packet_length= uint3korr(net->read_pos+2);
end= (char*) net->read_pos+5;
}
if (thd->client_capabilities & CLIENT_IGNORE_SPACE)
thd->variables.sql_mode|= MODE_IGNORE_SPACE;
#ifdef HAVE_OPENSSL
DBUG_PRINT("info", ("client capabilities: %d", thd->client_capabilities));
if (thd->client_capabilities & CLIENT_SSL)
{
/* Do the SSL layering. */
if (!ssl_acceptor_fd)
{
inc_host_errors(&thd->remote.sin_addr);
return(ER_HANDSHAKE_ERROR);
}
DBUG_PRINT("info", ("IO layer change in progress..."));
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);
return(ER_HANDSHAKE_ERROR);
}
DBUG_PRINT("info", ("Reading user information over SSL layer"));
if ((pkt_len= my_net_read(net)) == packet_error ||
pkt_len < NORMAL_HANDSHAKE_SIZE)
{
DBUG_PRINT("error", ("Failed to read user information (pkt_len= %lu)",
pkt_len));
inc_host_errors(&thd->remote.sin_addr);
return(ER_HANDSHAKE_ERROR);
}
}
#endif
if (end >= (char*) net->read_pos+ pkt_len +2)
{
inc_host_errors(&thd->remote.sin_addr);
return(ER_HANDSHAKE_ERROR);
}
if (thd->client_capabilities & CLIENT_INTERACTIVE)
thd->variables.net_wait_timeout= thd->variables.net_interactive_timeout;
if ((thd->client_capabilities & CLIENT_TRANSACTIONS) &&
opt_using_transactions)
net->return_status= &thd->server_status;
net->read_timeout=(uint) thd->variables.net_read_timeout;
char *user= end;
char *passwd= strend(user)+1;
char *db= passwd;
char db_buff[NAME_LEN+1]; // buffer to store db in utf8
char user_buff[USERNAME_LENGTH+1]; // buffer to store user in utf8
/*
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;
/* Since 4.1 all database names are stored in utf8 */
if (db)
{
db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
system_charset_info,
db, strlen(db),
thd->charset())]= 0;
db= db_buff;
}
if (user)
{
user_buff[copy_and_convert(user_buff, sizeof(user_buff)-1,
system_charset_info, user, strlen(user),
thd->charset())]= '\0';
user= user_buff;
}
if (thd->user)
x_free(thd->user);
if (!(thd->user= my_strdup(user, MYF(0))))
return (ER_OUT_OF_RESOURCES);
return check_user(thd, COM_CONNECT, passwd, passwd_len, db, true);
}
void execute_init_command(THD *thd, sys_var_str *init_command_var,
rw_lock_t *var_mutex)
{
Vio* save_vio;
ulong save_client_capabilities;
thd->proc_info= "Execution of init_command";
/*
We need to lock init_command_var because
during execution of init_command_var query
values of init_command_var can't be changed
*/
rw_rdlock(var_mutex);
thd->query= init_command_var->value;
thd->query_length= init_command_var->value_length;
save_client_capabilities= thd->client_capabilities;
thd->client_capabilities|= CLIENT_MULTI_QUERIES;
/*
We don't need return result of execution to client side.
To forbid this we should set thd->net.vio to 0.
*/
save_vio= thd->net.vio;
thd->net.vio= 0;
dispatch_command(COM_QUERY, thd, thd->query, thd->query_length+1);
rw_unlock(var_mutex);
thd->client_capabilities= save_client_capabilities;
thd->net.vio= save_vio;
}
pthread_handler_decl(handle_one_connection,arg)
{
THD *thd=(THD*) arg;
uint launch_time =
(uint) ((thd->thr_create_time = time(NULL)) - thd->connect_time);
if (launch_time >= slow_launch_time)
statistic_increment(slow_launch_threads,&LOCK_status );
pthread_detach_this_thread();
#if !defined( __WIN__) && !defined(OS2) // Win32 calls this in pthread_create
// The following calls needs to be done before we call DBUG_ macros
if (!(test_flags & TEST_NO_THREADS) & my_thread_init())
{
close_connection(thd, ER_OUT_OF_RESOURCES, 1);
statistic_increment(aborted_connects,&LOCK_status);
end_thread(thd,0);
return 0;
}
#endif
/*
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.
*/
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_*
#if defined(__WIN__)
init_signals(); // IRENA; testing ?
#elif !defined(OS2) && !defined(__NETWARE__)
sigset_t set;
VOID(sigemptyset(&set)); // Get mask in use
VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
#endif
if (thd->store_globals())
{
close_connection(thd, ER_OUT_OF_RESOURCES, 1);
statistic_increment(aborted_connects,&LOCK_status);
end_thread(thd,0);
return 0;
}
do
{
int error;
NET *net= &thd->net;
thd->thread_stack= (char*) &thd;
if ((error=check_connection(thd)))
{ // Wrong permissions
if (error > 0)
net_printf(thd,error,thd->host_or_ip);
#ifdef __NT__
if (vio_type(net->vio) == VIO_TYPE_NAMEDPIPE)
my_sleep(1000); /* must wait after eof() */
#endif
statistic_increment(aborted_connects,&LOCK_status);
goto end_thread;
}
#ifdef __NETWARE__
netware_reg_user(thd->ip, thd->user, "MySQL");
#endif
if (thd->variables.max_join_size == HA_POS_ERROR)
thd->options |= OPTION_BIG_SELECTS;
if (thd->client_capabilities & CLIENT_COMPRESS)
net->compress=1; // Use compression
thd->version= refresh_version;
if (sys_init_connect.value_length && !(thd->master_access & SUPER_ACL))
{
execute_init_command(thd, &sys_init_connect, &LOCK_sys_init_connect);
if (thd->query_error)
thd->killed= 1;
}
thd->proc_info=0;
thd->set_time();
thd->init_for_queries();
while (!net->error && net->vio != 0 && !thd->killed)
{
if (do_command(thd))
break;
}
if (thd->user_connect)
decrease_user_connections(thd->user_connect);
free_root(&thd->mem_root,MYF(0));
if (net->error && net->vio != 0 && net->report_error)
{
if (!thd->killed && thd->variables.log_warnings > 1)
sql_print_warning(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)));
send_error(thd,net->last_errno,NullS);
statistic_increment(aborted_threads,&LOCK_status);
}
else if (thd->killed)
{
statistic_increment(aborted_threads,&LOCK_status);
}
end_thread:
close_connection(thd, 0, 1);
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 */
}
#endif /* EMBEDDED_LIBRARY */
/*
Execute commands from bootstrap_file.
Used when creating the initial grant tables
*/
extern "C" pthread_handler_decl(handle_bootstrap,arg)
{
THD *thd=(THD*) arg;
FILE *file=bootstrap_file;
char *buff;
/* The following must be called before DBUG_ENTER */
if (my_thread_init() || thd->store_globals())
{
#ifndef EMBEDDED_LIBRARY
close_connection(thd, ER_OUT_OF_RESOURCES, 1);
#endif
thd->fatal_error();
goto end;
}
DBUG_ENTER("handle_bootstrap");
#ifndef EMBEDDED_LIBRARY
pthread_detach_this_thread();
thd->thread_stack= (char*) &thd;
#if !defined(__WIN__) && !defined(OS2) && !defined(__NETWARE__)
sigset_t set;
VOID(sigemptyset(&set)); // Get mask in use
VOID(pthread_sigmask(SIG_UNBLOCK,&set,&thd->block_signals));
#endif
#endif /* EMBEDDED_LIBRARY */
if (thd->variables.max_join_size == HA_POS_ERROR)
thd->options |= OPTION_BIG_SELECTS;
thd->proc_info=0;
thd->version=refresh_version;
thd->priv_user=thd->user=(char*) my_strdup("boot", MYF(MY_WME));
buff= (char*) thd->net.buff;
thd->init_for_queries();
while (fgets(buff, thd->net.max_packet, file))
{
uint length=(uint) strlen(buff);
if (buff[length-1]!='\n' && !feof(file))
{
send_error(thd,ER_NET_PACKET_TOO_LARGE, NullS);
thd->is_fatal_error= 1;
break;
}
while (length && (my_isspace(thd->charset(), buff[length-1]) ||
buff[length-1] == ';'))
length--;
buff[length]=0;
thd->query_length=length;
thd->query= thd->memdup_w_gap(buff, length+1, thd->db_length+1);
thd->query[length] = '\0';
thd->query_id=query_id++;
if (mqh_used && thd->user_connect && check_mqh(thd, SQLCOM_END))
{
thd->net.error = 0;
close_thread_tables(thd); // Free tables
free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
break;
}
mysql_parse(thd,thd->query,length);
close_thread_tables(thd); // Free tables
if (thd->is_fatal_error)
break;
free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
free_root(&thd->transaction.mem_root,MYF(MY_KEEP_PREALLOC));
}
/* thd->fatal_error should be set in case something went wrong */
end:
#ifndef EMBEDDED_LIBRARY
(void) pthread_mutex_lock(&LOCK_thread_count);
thread_count--;
(void) pthread_mutex_unlock(&LOCK_thread_count);
(void) pthread_cond_broadcast(&COND_thread_count);
my_thread_end();
pthread_exit(0);
#endif
DBUG_RETURN(0); // Never reached
}
/* This works because items are allocated with sql_alloc() */
void free_items(Item *item)
{
for (; item ; item=item->next)
item->delete_self();
}
/* This works because items are allocated with sql_alloc() */
void cleanup_items(Item *item)
{
for (; item ; item=item->next)
item->cleanup();
}
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;
if (!(table_list = (TABLE_LIST*) thd->calloc(sizeof(TABLE_LIST))))
DBUG_RETURN(1); // out of memory
table_list->db = db;
table_list->real_name = table_list->alias = tbl_name;
table_list->lock_type = TL_READ_NO_INSERT;
table_list->next = 0;
if (!db || check_db_name(db))
{
net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
goto err;
}
if (lower_case_table_names)
my_casedn_str(files_charset_info, tbl_name);
remove_escape(table_list->real_name);
if (!(table=open_ltable(thd, table_list, TL_READ_NO_INSERT)))
DBUG_RETURN(1);
if (check_one_table_access(thd, SELECT_ACL, table_list))
goto err;
thd->free_list = 0;
thd->query_length=(uint) strlen(tbl_name);
thd->query = tbl_name;
if ((error = mysqld_dump_create_info(thd, table, -1)))
{
my_error(ER_GET_ERRNO, MYF(0), my_errno);
goto err;
}
net_flush(&thd->net);
if ((error= table->file->dump(thd,fd)))
my_error(ER_GET_ERRNO, MYF(0), error);
err:
close_thread_tables(thd);
DBUG_RETURN(error);
}
#ifndef EMBEDDED_LIBRARY
/*
Read one command from socket and execute it (query or simple command).
This function is called in loop from thread function.
SYNOPSIS
do_command()
RETURN VALUE
0 success
1 request of thread shutdown (see dispatch_command() description)
*/
bool do_command(THD *thd)
{
char *packet;
uint old_timeout;
ulong packet_length;
NET *net;
enum enum_server_command command;
DBUG_ENTER("do_command");
net= &thd->net;
/*
indicator of uninitialized lex => normal flow of errors handling
(see my_message_sql)
*/
thd->lex->current_select= 0;
packet=0;
old_timeout=net->read_timeout;
// Wait max for 8 hours
net->read_timeout=(uint) thd->variables.net_wait_timeout;
thd->clear_error(); // Clear error message
net_new_transaction(net);
if ((packet_length=my_net_read(net)) == packet_error)
{
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)
{
statistic_increment(aborted_threads,&LOCK_status);
DBUG_RETURN(TRUE); // We have to close it.
}
send_error(thd,net->last_errno,NullS);
net->error= 0;
DBUG_RETURN(FALSE);
}
else
{
packet=(char*) net->read_pos;
command = (enum enum_server_command) (uchar) packet[0];
if (command >= COM_END)
command= COM_END; // Wrong command
DBUG_PRINT("info",("Command on %s = %d (%s)",
vio_description(net->vio), command,
command_name[command]));
}
net->read_timeout=old_timeout; // restore it
/*
packet_length contains length of data, as it was stored in packet
header. In case of malformed header, packet_length can be zero.
If packet_length is not zero, my_net_read ensures that this number
of bytes was actually read from network. Additionally my_net_read
sets packet[packet_length]= 0 (thus if packet_length == 0,
command == packet[0] == COM_SLEEP).
In dispatch_command packet[packet_length] points beyond the end of packet.
*/
DBUG_RETURN(dispatch_command(command,thd, packet+1, (uint) packet_length));
}
#endif /* EMBEDDED_LIBRARY */
/*
Perform one connection-level (COM_XXXX) command.
SYNOPSIS
dispatch_command()
thd connection handle
command type of command to perform
packet data for the command, packet is always null-terminated
packet_length length of packet + 1 (to show that data is
null-terminated) except for COM_SLEEP, where it
can be zero.
RETURN VALUE
0 ok
1 request of thread shutdown, i. e. if command is
COM_QUIT/COM_SHUTDOWN
*/
bool dispatch_command(enum enum_server_command command, THD *thd,
char* packet, uint packet_length)
{
NET *net= &thd->net;
bool error= 0;
DBUG_ENTER("dispatch_command");
thd->command=command;
/*
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
*/
thd->slow_command=FALSE;
thd->set_time();
VOID(pthread_mutex_lock(&LOCK_thread_count));
thd->query_id=query_id;
if (command != COM_STATISTICS && command != COM_PING)
query_id++;
thread_running++;
/* TODO: set thd->lex->sql_command to SQLCOM_END here */
VOID(pthread_mutex_unlock(&LOCK_thread_count));
thd->server_status&=
~(SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED);
switch (command) {
case COM_INIT_DB:
{
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;
}
#ifdef HAVE_REPLICATION
case COM_REGISTER_SLAVE:
{
if (!register_slave(thd, (uchar*)packet, packet_length))
send_ok(thd);
break;
}
#endif
case COM_TABLE_DUMP:
{
char *db, *tbl_name;
uint db_len= *(uchar*) packet;
uint tbl_len= *(uchar*) (packet + db_len + 1);
statistic_increment(com_other, &LOCK_status);
thd->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;
}
case COM_CHANGE_USER:
{
thd->change_user();
thd->clear_error(); // if errors from rollback
statistic_increment(com_other, &LOCK_status);
char *user= (char*) packet;
char *passwd= strend(user)+1;
/*
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).
*/
char db_buff[NAME_LEN+1]; // buffer to store db in utf8
char *db= passwd;
uint passwd_len= thd->client_capabilities & CLIENT_SECURE_CONNECTION ?
*passwd++ : strlen(passwd);
db+= passwd_len + 1;
#ifndef EMBEDDED_LIBRARY
/* Small check for incomming packet */
if ((uint) ((uchar*) db - net->read_pos) > packet_length)
{
send_error(thd, ER_UNKNOWN_COM_ERROR);
break;
}
#endif
/* Convert database name to utf8 */
db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1,
system_charset_info, db, strlen(db),
thd->charset())]= 0;
db= db_buff;
/* 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_user_connect= thd->user_connect;
if (!(thd->user= my_strdup(user, MYF(0))))
{
thd->user= save_user;
send_error(thd, ER_OUT_OF_RESOURCES);
break;
}
/* Clear variables that are allocated */
thd->user_connect= 0;
int res= check_user(thd, COM_CHANGE_USER, passwd, passwd_len, db, FALSE);
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->user_connect= save_user_connect;
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 (save_user_connect)
decrease_user_connections(save_user_connect);
x_free((gptr) save_db);
x_free((gptr) save_user);
}
break;
}
case COM_EXECUTE:
{
mysql_stmt_execute(thd, packet, packet_length);
break;
}
case COM_LONG_DATA:
{
mysql_stmt_get_longdata(thd, packet, packet_length);
break;
}
case COM_PREPARE:
{
mysql_stmt_prepare(thd, packet, packet_length);
break;
}
case COM_CLOSE_STMT:
{
mysql_stmt_free(thd, packet);
break;
}
case COM_RESET_STMT:
{
mysql_stmt_reset(thd, packet);
break;
}
case COM_QUERY:
{
if (alloc_query(thd, packet, packet_length))
break; // fatal error is set
mysql_log.write(thd,command,"%s",thd->query);
DBUG_PRINT("query",("%-.4096s",thd->query));
mysql_parse(thd,thd->query, thd->query_length);
while (!thd->killed && !thd->is_fatal_error && thd->lex->found_colon)
{
char *packet= thd->lex->found_colon;
/*
Multiple queries exits, execute them individually
in embedded server - just store them to be executed later
*/
#ifndef EMBEDDED_LIBRARY
if (thd->lock || thd->open_tables || thd->derived_tables)
close_thread_tables(thd);
#endif
ulong length= thd->query_length-(ulong)(packet-thd->query);
/* Remove garbage at start of query */
while (my_isspace(thd->charset(), *packet) && length > 0)
{
packet++;
length--;
}
VOID(pthread_mutex_lock(&LOCK_thread_count));
thd->query_length= length;
thd->query= packet;
thd->query_id= query_id++;
/* TODO: set thd->lex->sql_command to SQLCOM_END here */
VOID(pthread_mutex_unlock(&LOCK_thread_count));
#ifndef EMBEDDED_LIBRARY
mysql_parse(thd, packet, length);
#else
/*
'packet' can point inside the query_rest's buffer
so we have to do memmove here
*/
if (thd->query_rest.length() > length)
{
memmove(thd->query_rest.c_ptr(), packet, length);
thd->query_rest.length(length);
}
else
thd->query_rest.copy(packet, length, thd->query_rest.charset());
break;
#endif /*EMBEDDED_LIBRARY*/
}
if (!(specialflag & SPECIAL_NO_PRIOR))
my_pthread_setprio(pthread_self(),WAIT_PRIOR);
DBUG_PRINT("info",("query ready"));
break;
}
case COM_FIELD_LIST: // This isn't actually needed
#ifdef DONT_ALLOW_SHOW_COMMANDS
send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
break;
#else
{
char *fields, *pend;
TABLE_LIST table_list;
LEX_STRING conv_name;
statistic_increment(com_stat[SQLCOM_SHOW_FIELDS],&LOCK_status);
bzero((char*) &table_list,sizeof(table_list));
if (!(table_list.db=thd->db))
{
send_error(thd,ER_NO_DB_ERROR);
break;
}
thd->free_list=0;
pend= strend(packet);
thd->convert_string(&conv_name, system_charset_info,
packet, (uint) (pend-packet), thd->charset());
table_list.alias= table_list.real_name= conv_name.str;
packet= pend+1;
// command not cachable => no gap for data base name
if (!(thd->query=fields=thd->memdup(packet,thd->query_length+1)))
break;
mysql_log.write(thd,command,"%s %s",table_list.real_name,fields);
if (lower_case_table_names)
my_casedn_str(files_charset_info, table_list.real_name);
remove_escape(table_list.real_name); // This can't have wildcards
if (check_access(thd,SELECT_ACL,table_list.db,&table_list.grant.privilege,
0, 0))
break;
if (grant_option &&
check_grant(thd, SELECT_ACL, &table_list, 2, UINT_MAX, 0))
break;
mysqld_list_fields(thd,&table_list,fields);
free_items(thd->free_list);
thd->free_list= 0;
break;
}
#endif
case COM_QUIT:
/* We don't calculate statistics for this command */
mysql_log.write(thd,command,NullS);
net->error=0; // Don't give 'abort' message
error=TRUE; // End server
break;
case COM_CREATE_DB: // QQ: To be removed
{
char *db=thd->strdup(packet), *alias;
statistic_increment(com_stat[SQLCOM_CREATE_DB],&LOCK_status);
// null test to handle EOM
if (!db || !(alias= thd->strdup(db)) || check_db_name(db))
{
net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
break;
}
if (check_access(thd,CREATE_ACL,db,0,1,0))
break;
mysql_log.write(thd,command,packet);
mysql_create_db(thd,(lower_case_table_names == 2 ? alias : db),0,0);
break;
}
case COM_DROP_DB: // QQ: To be removed
{
statistic_increment(com_stat[SQLCOM_DROP_DB],&LOCK_status);
char *db=thd->strdup(packet), *alias;
// null test to handle EOM
if (!db || !(alias= thd->strdup(db)) || check_db_name(db))
{
net_printf(thd,ER_WRONG_DB_NAME, db ? db : "NULL");
break;
}
if (check_access(thd,DROP_ACL,db,0,1,0))
break;
if (thd->locked_tables || thd->active_transaction())
{
send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
break;
}
mysql_log.write(thd,command,db);
mysql_rm_db(thd, (lower_case_table_names == 2 ? alias : db), 0, 0);
break;
}
#ifndef EMBEDDED_LIBRARY
case COM_BINLOG_DUMP:
{
statistic_increment(com_other,&LOCK_status);
thd->slow_command = TRUE;
if (check_global_access(thd, REPL_SLAVE_ACL))
break;
mysql_log.write(thd,command, 0);
ulong pos;
ushort flags;
uint32 slave_server_id;
/* TODO: The following has to be changed to an 8 byte integer */
pos = uint4korr(packet);
flags = uint2korr(packet + 4);
thd->server_id=0; /* avoid suicide */
if ((slave_server_id= uint4korr(packet+6))) // mysqlbinlog.server_id==0
kill_zombie_dump_threads(slave_server_id);
thd->server_id = slave_server_id;
mysql_binlog_send(thd, thd->strdup(packet + 10), (my_off_t) pos, flags);
unregister_slave(thd,1,1);
// fake COM_QUIT -- if we get here, the thread needs to terminate
error = TRUE;
net->error = 0;
break;
}
#endif
case COM_REFRESH:
{
statistic_increment(com_stat[SQLCOM_FLUSH],&LOCK_status);
ulong options= (ulong) (uchar) packet[0];
if (check_global_access(thd,RELOAD_ACL))
break;
mysql_log.write(thd,command,NullS);
if (reload_acl_and_cache(thd, options, (TABLE_LIST*) 0, NULL))
send_error(thd, 0);
else
send_ok(thd);
break;
}
#ifndef EMBEDDED_LIBRARY
case COM_SHUTDOWN:
{
statistic_increment(com_other,&LOCK_status);
if (check_global_access(thd,SHUTDOWN_ACL))
break; /* purecov: inspected */
/*
If the client is < 4.1.3, it is going to send us no argument; then
packet_length is 1, packet[0] is the end 0 of the packet. Note that
SHUTDOWN_DEFAULT is 0. If client is >= 4.1.3, the shutdown level is in
packet[0].
*/
enum mysql_enum_shutdown_level level=
(enum mysql_enum_shutdown_level) (uchar) packet[0];
DBUG_PRINT("quit",("Got shutdown command for level %u", level));
if (level == SHUTDOWN_DEFAULT)
level= SHUTDOWN_WAIT_ALL_BUFFERS; // soon default will be configurable
else if (level != SHUTDOWN_WAIT_ALL_BUFFERS)
{
my_error(ER_NOT_SUPPORTED_YET, MYF(0), "this shutdown level");
send_error(thd);
break;
}
DBUG_PRINT("quit",("Got shutdown command for level %u", level));
mysql_log.write(thd,command,NullS);
send_eof(thd);
#ifdef __WIN__
sleep(1); // must wait after eof()
#endif
#ifndef OS2
send_eof(thd); // This is for 'quit request'
#endif
close_connection(thd, 0, 1);
close_thread_tables(thd); // Free before kill
free_root(&thd->mem_root,MYF(0));
free_root(&thd->transaction.mem_root,MYF(0));
kill_mysql();
error=TRUE;
break;
}
#endif
case COM_STATISTICS:
{
mysql_log.write(thd,command,NullS);
statistic_increment(com_stat[SQLCOM_SHOW_STATUS],&LOCK_status);
#ifndef EMBEDDED_LIBRARY
char buff[200];
#else
char *buff= thd->net.last_error;
#endif
ulong uptime = (ulong) (thd->start_time - start_time);
sprintf((char*) buff,
"Uptime: %ld Threads: %d Questions: %lu Slow queries: %ld Opens: %ld Flush tables: %ld Open tables: %u Queries per second avg: %.3f",
uptime,
(int) thread_count,thd->query_id,long_query_count,
opened_tables,refresh_version, cached_tables(),
uptime ? (float)thd->query_id/(float)uptime : 0);
#ifdef SAFEMALLOC
if (sf_malloc_cur_memory) // Using SAFEMALLOC
sprintf(strend(buff), " Memory in use: %ldK Max memory used: %ldK",
(sf_malloc_cur_memory+1023L)/1024L,
(sf_malloc_max_memory+1023L)/1024L);
#endif
#ifndef EMBEDDED_LIBRARY
VOID(my_net_write(net, buff,(uint) strlen(buff)));
VOID(net_flush(net));
#endif
break;
}
case COM_PING:
statistic_increment(com_other,&LOCK_status);
send_ok(thd); // Tell client we are alive
break;
case COM_PROCESS_INFO:
statistic_increment(com_stat[SQLCOM_SHOW_PROCESSLIST],&LOCK_status);
if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
break;
mysql_log.write(thd,command,NullS);
mysqld_list_processes(thd,
thd->master_access & PROCESS_ACL ?
NullS : thd->priv_user, 0);
break;
case COM_PROCESS_KILL:
{
statistic_increment(com_stat[SQLCOM_KILL],&LOCK_status);
ulong id=(ulong) uint4korr(packet);
kill_one_thread(thd,id);
break;
}
case COM_SET_OPTION:
{
statistic_increment(com_stat[SQLCOM_SET_OPTION], &LOCK_status);
enum_mysql_set_option command= (enum_mysql_set_option) uint2korr(packet);
switch (command) {
case MYSQL_OPTION_MULTI_STATEMENTS_ON:
thd->client_capabilities|= CLIENT_MULTI_STATEMENTS;
send_eof(thd);
break;
case MYSQL_OPTION_MULTI_STATEMENTS_OFF:
thd->client_capabilities&= ~CLIENT_MULTI_STATEMENTS;
send_eof(thd);
break;
default:
send_error(thd, ER_UNKNOWN_COM_ERROR);
break;
}
break;
}
case COM_DEBUG:
statistic_increment(com_other,&LOCK_status);
if (check_global_access(thd, SUPER_ACL))
break; /* purecov: inspected */
mysql_print_status(thd);
mysql_log.write(thd,command,NullS);
send_eof(thd);
break;
case COM_SLEEP:
case COM_CONNECT: // Impossible here
case COM_TIME: // Impossible from client
case COM_DELAYED_INSERT:
case COM_END:
default:
send_error(thd, ER_UNKNOWN_COM_ERROR);
break;
}
if (thd->lock || thd->open_tables || thd->derived_tables)
{
thd->proc_info="closing tables";
close_thread_tables(thd); /* Free tables */
}
if (thd->is_fatal_error)
send_error(thd,0); // End of memory ?
time_t start_of_query=thd->start_time;
thd->end_time(); // Set start time
/* If not reading from backup and if the query took too long */
if (!thd->slow_command && !thd->user_time) // do not log 'slow_command' queries
{
thd->proc_info="logging slow query";
if ((ulong) (thd->start_time - thd->time_after_lock) >
thd->variables.long_query_time ||
((thd->server_status &
(SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED)) &&
(specialflag & SPECIAL_LOG_QUERIES_NOT_USING_INDEXES)))
{
long_query_count++;
mysql_slow_log.write(thd, thd->query, thd->query_length, start_of_query);
}
}
thd->proc_info="cleaning up";
VOID(pthread_mutex_lock(&LOCK_thread_count)); // For process list
thd->proc_info=0;
thd->command=COM_SLEEP;
thd->query=0;
thd->query_length=0;
thread_running--;
VOID(pthread_mutex_unlock(&LOCK_thread_count));
thd->packet.shrink(thd->variables.net_buffer_length); // Reclaim some memory
free_root(&thd->mem_root,MYF(MY_KEEP_PREALLOC));
DBUG_RETURN(error);
}
/*
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
/* Remove garbage at start and end of query */
while (my_isspace(thd->charset(),packet[0]) && packet_length > 0)
{
packet++;
packet_length--;
}
char *pos=packet+packet_length; // Point at end null
while (packet_length > 0 &&
(pos[-1] == ';' || my_isspace(thd->charset() ,pos[-1])))
{
pos--;
packet_length--;
}
/* We must allocate some extra memory for query cache */
thd->query_length= 0; // Extra safety: Avoid races
if (!(thd->query= (char*) thd->memdup_w_gap((gptr) (packet),
packet_length,
thd->db_length+ 1 +
QUERY_CACHE_FLAGS_SIZE)))
return 1;
thd->query[packet_length]=0;
thd->query_length= packet_length;
/* Reclaim some memory */
thd->packet.shrink(thd->variables.net_buffer_length);
thd->convert_buffer.shrink(thd->variables.net_buffer_length);
if (!(specialflag & SPECIAL_NO_PRIOR))
my_pthread_setprio(pthread_self(),QUERY_PRIOR);
return 0;
}
/****************************************************************************
** mysql_execute_command
** Execute command saved in thd and current_lex->sql_command
****************************************************************************/
void
mysql_execute_command(THD *thd)
{
int res= 0;
LEX *lex= thd->lex;
TABLE_LIST *tables= (TABLE_LIST*) lex->select_lex.table_list.first;
SELECT_LEX *select_lex= &lex->select_lex;
SELECT_LEX_UNIT *unit= &lex->unit;
DBUG_ENTER("mysql_execute_command");
/*
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.
*/
if (tables || &lex->select_lex != lex->all_selects_list)
mysql_reset_errors(thd);
#ifdef HAVE_REPLICATION
if (thd->slave_thread)
{
/*
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 (all_tables_not_ok(thd,tables))
{
/* we warn the slave SQL thread */
my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
DBUG_VOID_RETURN;
}
#ifndef TO_BE_DELETED
/*
This is a workaround to deal with the shortcoming in 3.23.44-3.23.46
masters in RELEASE_LOCK() logging. We re-write SELECT RELEASE_LOCK()
as DO RELEASE_LOCK()
*/
if (lex->sql_command == SQLCOM_SELECT)
{
lex->sql_command = SQLCOM_DO;
lex->insert_list = &select_lex->item_list;
}
#endif
}
#endif /* !HAVE_REPLICATION */
if ((&lex->select_lex != lex->all_selects_list ||
lex->time_zone_tables_used) &&
lex->unit.create_total_list(thd, lex, &tables))
DBUG_VOID_RETURN;
/*
When option readonly is set deny operations which change tables.
Except for the replication thread and the 'super' users.
*/
if (opt_readonly &&
!(thd->slave_thread || (thd->master_access & SUPER_ACL)) &&
(uc_update_queries[lex->sql_command] > 0))
{
net_printf(thd, ER_OPTION_PREVENTS_STATEMENT, "--read-only");
DBUG_VOID_RETURN;
}
statistic_increment(com_stat[lex->sql_command],&LOCK_status);
switch (lex->sql_command) {
case SQLCOM_SELECT:
{
/* assign global limit variable if limit is not given */
{
SELECT_LEX *param= lex->unit.global_parameters;
if (!param->explicit_limit)
param->select_limit= thd->variables.select_limit;
}
select_result *result=lex->result;
if (tables)
{
res=check_table_access(thd,
lex->exchange ? SELECT_ACL | FILE_ACL :
SELECT_ACL,
tables,0);
}
else
res=check_access(thd, lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL,
any_db,0,0,0);
if (res)
{
res=0;
break; // Error message is given
}
/*
In case of single SELECT unit->global_parameters points on first SELECT
TODO: move counters to SELECT_LEX
*/
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);
if (unit->select_limit_cnt <
(ha_rows) unit->global_parameters->select_limit)
unit->select_limit_cnt= HA_POS_ERROR; // no limit
if (unit->select_limit_cnt == HA_POS_ERROR && !select_lex->next_select())
select_lex->options&= ~OPTION_FOUND_ROWS;
if (!(res=open_and_lock_tables(thd,tables)))
{
if (lex->describe)
{
if (!(result= new select_send()))
{
send_error(thd, ER_OUT_OF_RESOURCES);
DBUG_VOID_RETURN;
}
else
thd->send_explain_fields(result);
res= mysql_explain_union(thd, &thd->lex->unit, result);
if (lex->describe & DESCRIBE_EXTENDED)
{
char buff[1024];
String str(buff,(uint32) sizeof(buff), system_charset_info);
str.length(0);
thd->lex->unit.print(&str);
str.append('\0');
push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
ER_YES, str.ptr());
}
result->send_eof();
delete result;
}
else
{
if (!result && !(result= new select_send()))
{
res= -1;
break;
}
query_cache_store_query(thd, tables);
res= handle_select(thd, lex, result);
if (result != lex->result)
delete result;
}
}
break;
}
case SQLCOM_PREPARE:
{
char *query_str;
uint query_len;
if (lex->prepared_stmt_code_is_varref)
{
/* This is PREPARE stmt FROM @var. */
String str;
CHARSET_INFO *to_cs= thd->variables.collation_connection;
bool need_conversion;
user_var_entry *entry;
uint32 unused;
/*
Convert @var contents to string in connection character set. Although
it is known that int/real/NULL value cannot be a valid query we still
convert it for error messages to uniform.
*/
if ((entry=
(user_var_entry*)hash_search(&thd->user_vars,
(byte*)lex->prepared_stmt_code.str,
lex->prepared_stmt_code.length))
&& entry->value)
{
String *pstr;
my_bool is_var_null;
pstr= entry->val_str(&is_var_null, &str, NOT_FIXED_DEC);
DBUG_ASSERT(!is_var_null);
if (!pstr)
send_error(thd, ER_OUT_OF_RESOURCES);
DBUG_ASSERT(pstr == &str);
}
else
str.set("NULL", 4, &my_charset_latin1);
need_conversion=
String::needs_conversion(str.length(), str.charset(), to_cs, &unused);
query_len= need_conversion? (str.length() * to_cs->mbmaxlen) :
str.length();
if (!(query_str= alloc_root(&thd->mem_root, query_len+1)))
send_error(thd, ER_OUT_OF_RESOURCES);
if (need_conversion)
query_len= copy_and_convert(query_str, query_len, to_cs, str.ptr(),
str.length(), str.charset());
else
memcpy(query_str, str.ptr(), str.length());
query_str[query_len]= 0;
}
else
{
query_str= lex->prepared_stmt_code.str;
query_len= lex->prepared_stmt_code.length;
DBUG_PRINT("info", ("PREPARE: %.*s FROM '%.*s' \n",
lex->prepared_stmt_name.length,
lex->prepared_stmt_name.str,
query_len, query_str));
}
thd->command= COM_PREPARE;
if (!mysql_stmt_prepare(thd, query_str, query_len + 1,
&lex->prepared_stmt_name))
send_ok(thd, 0L, 0L, "Statement prepared");
break;
}
case SQLCOM_EXECUTE:
{
DBUG_PRINT("info", ("EXECUTE: %.*s\n",
lex->prepared_stmt_name.length,
lex->prepared_stmt_name.str));
mysql_sql_stmt_execute(thd, &lex->prepared_stmt_name);
lex->prepared_stmt_params.empty();
break;
}
case SQLCOM_DEALLOCATE_PREPARE:
{
Statement* stmt;
DBUG_PRINT("info", ("DEALLOCATE PREPARE: %.*s\n",
lex->prepared_stmt_name.length,
lex->prepared_stmt_name.str));
if ((stmt= thd->stmt_map.find_by_name(&lex->prepared_stmt_name)))
{
thd->stmt_map.erase(stmt);
send_ok(thd);
}
else
{
res= -1;
my_error(ER_UNKNOWN_STMT_HANDLER, MYF(0),
lex->prepared_stmt_name.length, lex->prepared_stmt_name.str,
"DEALLOCATE PREPARE");
}
break;
}
case SQLCOM_DO:
if (tables && ((res= check_table_access(thd, SELECT_ACL, tables,0)) ||
(res= open_and_lock_tables(thd,tables))))
break;
res= mysql_do(thd, *lex->insert_list);
if (thd->net.report_error)
res= -1;
break;
case SQLCOM_EMPTY_QUERY:
send_ok(thd);
break;
case SQLCOM_HELP:
res= mysqld_help(thd,lex->help_arg);
break;
#ifndef EMBEDDED_LIBRARY
case SQLCOM_PURGE:
{
if (check_global_access(thd, SUPER_ACL))
goto error;
// PURGE MASTER LOGS TO 'file'
res = purge_master_logs(thd, lex->to_log);
break;
}
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;
}
#endif
case SQLCOM_SHOW_WARNS:
{
res= mysqld_show_warnings(thd, (ulong)
((1L << (uint) MYSQL_ERROR::WARN_LEVEL_NOTE) |
(1L << (uint) MYSQL_ERROR::WARN_LEVEL_WARN) |
(1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR)
));
break;
}
case SQLCOM_SHOW_ERRORS:
{
res= mysqld_show_warnings(thd, (ulong)
(1L << (uint) MYSQL_ERROR::WARN_LEVEL_ERROR));
break;
}
case SQLCOM_SHOW_NEW_MASTER:
{
if (check_global_access(thd, REPL_SLAVE_ACL))
goto error;
/* This query don't work now. See comment in repl_failsafe.cc */
#ifndef WORKING_NEW_MASTER
net_printf(thd, ER_NOT_SUPPORTED_YET, "SHOW NEW MASTER");
res= 1;
#else
res = show_new_master(thd);
#endif
break;
}
#ifdef HAVE_REPLICATION
case SQLCOM_SHOW_SLAVE_HOSTS:
{
if (check_global_access(thd, REPL_SLAVE_ACL))
goto error;
res = show_slave_hosts(thd);
break;
}
case SQLCOM_SHOW_BINLOG_EVENTS:
{
if (check_global_access(thd, REPL_SLAVE_ACL))
goto error;
res = show_binlog_events(thd);
break;
}
#endif
case SQLCOM_BACKUP_TABLE:
{
if (check_db_used(thd,tables) ||
check_table_access(thd,SELECT_ACL, tables,0) ||
check_global_access(thd, FILE_ACL))
goto error; /* purecov: inspected */
thd->slow_command=TRUE;
res = mysql_backup_table(thd, tables);
break;
}
case SQLCOM_RESTORE_TABLE:
{
if (check_db_used(thd,tables) ||
check_table_access(thd, INSERT_ACL, tables,0) ||
check_global_access(thd, FILE_ACL))
goto error; /* purecov: inspected */
thd->slow_command=TRUE;
res = mysql_restore_table(thd, tables);
break;
}
case SQLCOM_ASSIGN_TO_KEYCACHE:
{
if (check_db_used(thd, tables) ||
check_access(thd, INDEX_ACL, tables->db,
&tables->grant.privilege, 0, 0))
goto error;
res= mysql_assign_to_keycache(thd, tables, &lex->name_and_length);
break;
}
case SQLCOM_PRELOAD_KEYS:
{
if (check_db_used(thd, tables) ||
check_access(thd, INDEX_ACL, tables->db,
&tables->grant.privilege, 0, 0))
goto error;
res = mysql_preload_keys(thd, tables);
break;
}
#ifdef HAVE_REPLICATION
case SQLCOM_CHANGE_MASTER:
{
if (check_global_access(thd, SUPER_ACL))
goto error;
pthread_mutex_lock(&LOCK_active_mi);
res = change_master(thd,active_mi);
pthread_mutex_unlock(&LOCK_active_mi);
break;
}
case SQLCOM_SHOW_SLAVE_STAT:
{
/* Accept one of two privileges */
if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
goto error;
pthread_mutex_lock(&LOCK_active_mi);
res = show_master_info(thd,active_mi);
pthread_mutex_unlock(&LOCK_active_mi);
break;
}
case SQLCOM_SHOW_MASTER_STAT:
{
/* Accept one of two privileges */
if (check_global_access(thd, SUPER_ACL | REPL_CLIENT_ACL))
goto error;
res = show_binlog_info(thd);
break;
}
case SQLCOM_LOAD_MASTER_DATA: // sync with master
if (check_global_access(thd, SUPER_ACL))
goto error;
if (end_active_trans(thd))
res= -1;
else
res = load_master_data(thd);
break;
#endif /* HAVE_REPLICATION */
#ifdef HAVE_INNOBASE_DB
case SQLCOM_SHOW_INNODB_STATUS:
{
if (check_global_access(thd, SUPER_ACL))
goto error;
res = innodb_show_status(thd);
break;
}
#endif
#ifdef HAVE_REPLICATION
case SQLCOM_LOAD_MASTER_TABLE:
{
if (!tables->db)
tables->db=thd->db;
if (check_access(thd,CREATE_ACL,tables->db,&tables->grant.privilege,0,0))
goto error; /* purecov: inspected */
if (grant_option)
{
/* Check that the first table has CREATE privilege */
if (check_grant(thd, CREATE_ACL, tables, 0, 1, 0))
goto error;
}
if (strlen(tables->real_name) > NAME_LEN)
{
net_printf(thd,ER_WRONG_TABLE_NAME, tables->real_name);
break;
}
pthread_mutex_lock(&LOCK_active_mi);
/*
fetch_master_table will send the error to the client on failure.
Give error if the table already exists.
*/
if (!fetch_master_table(thd, tables->db, tables->real_name,
active_mi, 0, 0))
{
send_ok(thd);
}
pthread_mutex_unlock(&LOCK_active_mi);
break;
}
#endif /* HAVE_REPLICATION */
case SQLCOM_CREATE_TABLE:
{
/* Skip first table, which is the table we are creating */
TABLE_LIST *create_table, *create_table_local;
tables= lex->unlink_first_table(tables, &create_table,
&create_table_local);
if ((res= create_table_precheck(thd, tables, create_table)))
goto unsent_create_error;
#ifndef HAVE_READLINK
lex->create_info.data_file_name=lex->create_info.index_file_name=0;
#else
/* Fix names if symlinked tables */
if (append_file_to_dir(thd, &lex->create_info.data_file_name,
create_table->real_name) ||
append_file_to_dir(thd,&lex->create_info.index_file_name,
create_table->real_name))
{
res=-1;
goto unsent_create_error;
}
#endif
/*
If we are using SET CHARSET without DEFAULT, add an implicite
DEFAULT to not confuse old users. (This may change).
*/
if ((lex->create_info.used_fields &
(HA_CREATE_USED_DEFAULT_CHARSET | HA_CREATE_USED_CHARSET)) ==
HA_CREATE_USED_CHARSET)
{
lex->create_info.used_fields&= ~HA_CREATE_USED_CHARSET;
lex->create_info.used_fields|= HA_CREATE_USED_DEFAULT_CHARSET;
lex->create_info.default_table_charset= lex->create_info.table_charset;
lex->create_info.table_charset= 0;
}
if (select_lex->item_list.elements) // With select
{
select_result *result;
if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) &&
find_real_table_in_list(tables, create_table->db,
create_table->real_name))
{
net_printf(thd,ER_UPDATE_TABLE_USED, create_table->real_name);
goto create_error;
}
if (lex->create_info.used_fields & HA_CREATE_USED_UNION)
{
TABLE_LIST *tab;
for (tab= tables; tab; tab= tab->next)
{
if (find_real_table_in_list((TABLE_LIST*) lex->create_info.
merge_list.first,
tables->db, tab->real_name))
{
net_printf(thd, ER_UPDATE_TABLE_USED, tab->real_name);
goto create_error;
}
}
}
if (tables && check_table_access(thd, SELECT_ACL, tables,0))
goto create_error; // Error message is given
select_lex->options|= SELECT_NO_UNLOCK;
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
if (!(res=open_and_lock_tables(thd,tables)))
{
res= -1; // If error
if ((result=new select_create(create_table->db,
create_table->real_name,
&lex->create_info,
lex->create_list,
lex->key_list,
select_lex->item_list,lex->duplicates)))
{
/*
CREATE from SELECT give its SELECT_LEX for SELECT,
and item_list belong to SELECT
*/
select_lex->resolve_mode= SELECT_LEX::SELECT_MODE;
res=handle_select(thd, lex, result);
select_lex->resolve_mode= SELECT_LEX::NOMATTER_MODE;
}
//reset for PS
lex->create_list.empty();
lex->key_list.empty();
}
}
else // regular create
{
if (lex->name)
res= mysql_create_like_table(thd, create_table, &lex->create_info,
(Table_ident *)lex->name);
else
{
res= mysql_create_table(thd,create_table->db,
create_table->real_name, &lex->create_info,
lex->create_list,
lex->key_list,0,0);
}
if (!res)
send_ok(thd);
}
// put tables back for PS rexecuting
tables= lex->link_first_table_back(tables, create_table,
create_table_local);
break;
create_error:
res= 1; //error reported
unsent_create_error:
// put tables back for PS rexecuting
tables= lex->link_first_table_back(tables, create_table,
create_table_local);
break;
}
case SQLCOM_CREATE_INDEX:
if (check_one_table_access(thd, INDEX_ACL, tables))
goto error; /* purecov: inspected */
thd->slow_command=TRUE;
if (end_active_trans(thd))
res= -1;
else
res = mysql_create_index(thd, tables, lex->key_list);
break;
#ifdef HAVE_REPLICATION
case SQLCOM_SLAVE_START:
{
pthread_mutex_lock(&LOCK_active_mi);
start_slave(thd,active_mi,1 /* net report*/);
pthread_mutex_unlock(&LOCK_active_mi);
break;
}
case SQLCOM_SLAVE_STOP:
/*
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,
so it waits for the client thread because t is locked by it.
- then the client thread does SLAVE STOP.
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.
To prevent that, refuse SLAVE STOP if the
client thread has locked tables
*/
if (thd->locked_tables || thd->active_transaction())
{
send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
break;
}
{
pthread_mutex_lock(&LOCK_active_mi);
stop_slave(thd,active_mi,1/* net report*/);
pthread_mutex_unlock(&LOCK_active_mi);
break;
}
#endif /* HAVE_REPLICATION */
case SQLCOM_ALTER_TABLE:
#if defined(DONT_ALLOW_SHOW_COMMANDS)
send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
break;
#else
{
ulong priv=0;
if (lex->name && (!lex->name[0] || strlen(lex->name) > NAME_LEN))
{
net_printf(thd, ER_WRONG_TABLE_NAME, lex->name);
res=0;
break;
}
if (!select_lex->db)
select_lex->db=tables->db;
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)||
check_merge_table_access(thd, tables->db,
(TABLE_LIST *)
lex->create_info.merge_list.first))
goto error; /* purecov: inspected */
if (grant_option)
{
if (check_grant(thd, ALTER_ACL, tables, 0, UINT_MAX, 0))
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;
tmp_table.db=select_lex->db;
tmp_table.grant.privilege=priv;
if (check_grant(thd, INSERT_ACL | CREATE_ACL, &tmp_table, 0,
UINT_MAX, 0))
goto error;
}
}
/* Don't yet allow changing of symlinks with ALTER TABLE */
lex->create_info.data_file_name=lex->create_info.index_file_name=0;
/* ALTER TABLE ends previous transaction */
if (end_active_trans(thd))
res= -1;
else
{
thd->slow_command=TRUE;
res= mysql_alter_table(thd, select_lex->db, lex->name,
&lex->create_info,
tables, lex->create_list,
lex->key_list,
select_lex->order_list.elements,
(ORDER *) select_lex->order_list.first,
lex->duplicates, &lex->alter_info);
}
break;
}
#endif /*DONT_ALLOW_SHOW_COMMANDS*/
case SQLCOM_RENAME_TABLE:
{
TABLE_LIST *table;
if (check_db_used(thd,tables))
goto error;
for (table=tables ; table ; table=table->next->next)
{
if (check_access(thd, ALTER_ACL | DROP_ACL, table->db,
&table->grant.privilege,0,0) ||
check_access(thd, INSERT_ACL | CREATE_ACL, table->next->db,
&table->next->grant.privilege,0,0))
goto error;
if (grant_option)
{
TABLE_LIST old_list,new_list;
/*
we do not need initialize old_list and new_list because we will
come table[0] and table->next[0] there
*/
old_list=table[0];
new_list=table->next[0];
old_list.next=new_list.next=0;
if (check_grant(thd, ALTER_ACL, &old_list, 0, UINT_MAX, 0) ||
(!test_all_bits(table->next->grant.privilege,
INSERT_ACL | CREATE_ACL) &&
check_grant(thd, INSERT_ACL | CREATE_ACL, &new_list, 0,
UINT_MAX, 0)))
goto error;
}
}
query_cache_invalidate3(thd, tables, 0);
if (end_active_trans(thd))
res= -1;
else if (mysql_rename_tables(thd,tables))
res= -1;
break;
}
#ifndef EMBEDDED_LIBRARY
case SQLCOM_SHOW_BINLOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
DBUG_VOID_RETURN;
#else
{
if (check_global_access(thd, SUPER_ACL))
goto error;
res = show_binlogs(thd);
break;
}
#endif
#endif /* EMBEDDED_LIBRARY */
case SQLCOM_SHOW_CREATE:
#ifdef DONT_ALLOW_SHOW_COMMANDS
send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
DBUG_VOID_RETURN;
#else
{
if (check_db_used(thd, tables) ||
check_access(thd, SELECT_ACL | EXTRA_ACL, tables->db,
&tables->grant.privilege,0,0))
goto error;
res = mysqld_show_create(thd, tables);
break;
}
#endif
case SQLCOM_CHECKSUM:
{
if (check_db_used(thd,tables) ||
check_table_access(thd, SELECT_ACL | EXTRA_ACL , tables,0))
goto error; /* purecov: inspected */
res = mysql_checksum_table(thd, tables, &lex->check_opt);
break;
}
case SQLCOM_REPAIR:
{
if (check_db_used(thd,tables) ||
check_table_access(thd,SELECT_ACL | INSERT_ACL, tables,0))
goto error; /* purecov: inspected */
thd->slow_command=TRUE;
res = mysql_repair_table(thd, tables, &lex->check_opt);
/* ! 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);
}
}
break;
}
case SQLCOM_CHECK:
{
if (check_db_used(thd,tables) ||
check_table_access(thd, SELECT_ACL | EXTRA_ACL , tables,0))
goto error; /* purecov: inspected */
thd->slow_command=TRUE;
res = mysql_check_table(thd, tables, &lex->check_opt);
break;
}
case SQLCOM_ANALYZE:
{
if (check_db_used(thd,tables) ||
check_table_access(thd,SELECT_ACL | INSERT_ACL, tables,0))
goto error; /* purecov: inspected */
thd->slow_command=TRUE;
res = mysql_analyze_table(thd, tables, &lex->check_opt);
/* ! 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);
}
}
break;
}
case SQLCOM_OPTIMIZE:
{
if (check_db_used(thd,tables) ||
check_table_access(thd,SELECT_ACL | INSERT_ACL, tables,0))
goto error; /* purecov: inspected */
thd->slow_command=TRUE;
res= (specialflag & (SPECIAL_SAFE_MODE | SPECIAL_NO_NEW_FUNC)) ?
mysql_recreate_table(thd, tables, 1) :
mysql_optimize_table(thd, tables, &lex->check_opt);
/* ! 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);
}
}
break;
}
case SQLCOM_UPDATE:
if (update_precheck(thd, tables))
break;
res= mysql_update(thd,tables,
select_lex->item_list,
lex->value_list,
select_lex->where,
select_lex->order_list.elements,
(ORDER *) select_lex->order_list.first,
select_lex->select_limit,
lex->duplicates);
if (thd->net.report_error)
res= -1;
break;
case SQLCOM_UPDATE_MULTI:
{
if ((res= multi_update_precheck(thd, tables)))
break;
res= mysql_multi_update(thd,tables,
&select_lex->item_list,
&lex->value_list,
select_lex->where,
select_lex->options,
lex->duplicates, unit, select_lex);
break;
}
case SQLCOM_REPLACE:
case SQLCOM_INSERT:
{
my_bool update= (lex->value_list.elements ? UPDATE_ACL : 0);
if ((res= insert_precheck(thd, tables, update)))
break;
res = mysql_insert(thd,tables,lex->field_list,lex->many_values,
select_lex->item_list, lex->value_list,
(update ? DUP_UPDATE : lex->duplicates));
if (thd->net.report_error)
res= -1;
break;
}
case SQLCOM_REPLACE_SELECT:
case SQLCOM_INSERT_SELECT:
{
TABLE_LIST *first_local_table= (TABLE_LIST *) select_lex->table_list.first;
if ((res= insert_select_precheck(thd, tables)))
break;
/* Fix lock for first table */
if (tables->lock_type == TL_WRITE_DELAYED)
tables->lock_type= TL_WRITE;
/* Don't unlock tables until command is written to binary log */
select_lex->options|= SELECT_NO_UNLOCK;
select_result *result;
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
if (find_real_table_in_list(tables->next, tables->db, tables->real_name))
{
/* Using same table for INSERT and SELECT */
select_lex->options |= OPTION_BUFFER_RESULT;
}
if (!(res= open_and_lock_tables(thd, tables)) &&
(result= new select_insert(tables->table, &lex->field_list,
lex->duplicates)))
{
/* Skip first table, which is the table we are inserting in */
lex->select_lex.table_list.first= (byte*) first_local_table->next;
/*
insert/replace from SELECT give its SELECT_LEX for SELECT,
and item_list belong to SELECT
*/
lex->select_lex.resolve_mode= SELECT_LEX::SELECT_MODE;
res= handle_select(thd, lex, result);
/* revert changes for SP */
lex->select_lex.table_list.first= (byte*) first_local_table;
lex->select_lex.resolve_mode= SELECT_LEX::INSERT_MODE;
delete result;
if (thd->net.report_error)
res= -1;
}
else
res= -1;
break;
}
case SQLCOM_TRUNCATE:
if (check_one_table_access(thd, DELETE_ACL, tables))
goto error;
/*
Don't allow this within a transaction because we want to use
re-generate table
*/
if (thd->locked_tables || thd->active_transaction())
{
send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION,NullS);
goto error;
}
res=mysql_truncate(thd, tables, 0);
break;
case SQLCOM_DELETE:
{
if ((res= delete_precheck(thd, tables)))
break;
res = mysql_delete(thd,tables, select_lex->where,
&select_lex->order_list,
select_lex->select_limit, select_lex->options);
if (thd->net.report_error)
res= -1;
break;
}
case SQLCOM_DELETE_MULTI:
{
TABLE_LIST *aux_tables=
(TABLE_LIST *)thd->lex->auxilliary_table_list.first;
TABLE_LIST *target_tbl;
uint table_count;
multi_delete *result;
if ((res= multi_delete_precheck(thd, tables, &table_count)))
break;
/* condition will be TRUE on SP re-excuting */
if (select_lex->item_list.elements != 0)
select_lex->item_list.empty();
if (add_item_to_list(thd, new Item_null()))
{
res= -1;
break;
}
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 (target_tbl= (TABLE_LIST*) aux_tables;
target_tbl;
target_tbl= target_tbl->next)
{
TABLE_LIST *orig= target_tbl->table_list;
target_tbl->table= orig->table;
/*
Multi-delete can't be constructed over-union => we always have
single SELECT on top and have to check underlying SELECTs of it
*/
if (lex->select_lex.check_updateable_in_subqueries(orig->db,
orig->real_name))
{
my_error(ER_UPDATE_TABLE_USED, MYF(0),
orig->real_name);
res= -1;
break;
}
}
if (!thd->is_fatal_error && (result= new multi_delete(thd,aux_tables,
table_count)))
{
res= mysql_select(thd, &select_lex->ref_pointer_array,
select_lex->get_table_list(),
select_lex->with_wild,
select_lex->item_list,
select_lex->where,
0, (ORDER *)NULL, (ORDER *)NULL, (Item *)NULL,
(ORDER *)NULL,
select_lex->options | thd->options |
SELECT_NO_JOIN_CACHE | SELECT_NO_UNLOCK,
result, unit, select_lex);
if (thd->net.report_error)
res= -1;
delete result;
}
else
res= -1; // Error is not sent
close_thread_tables(thd);
break;
}
case SQLCOM_DROP_TABLE:
{
if (!lex->drop_temporary)
{
if (check_table_access(thd,DROP_ACL,tables,0))
goto error; /* purecov: inspected */
if (end_active_trans(thd))
{
res= -1;
break;
}
}
else
{
/*
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;
}
res= mysql_rm_table(thd,tables,lex->drop_if_exists, lex->drop_temporary);
}
break;
case SQLCOM_DROP_INDEX:
if (check_one_table_access(thd, INDEX_ACL, tables))
goto error; /* purecov: inspected */
if (end_active_trans(thd))
res= -1;
else
res = mysql_drop_index(thd, tables, &lex->alter_info);
break;
case SQLCOM_SHOW_DATABASES:
#if defined(DONT_ALLOW_SHOW_COMMANDS)
send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
DBUG_VOID_RETURN;
#else
if ((specialflag & SPECIAL_SKIP_SHOW_DB) &&
check_global_access(thd, SHOW_DB_ACL))
goto error;
res= mysqld_show_dbs(thd, (lex->wild ? lex->wild->ptr() : NullS));
break;
#endif
case SQLCOM_SHOW_PROCESSLIST:
if (!thd->priv_user[0] && check_global_access(thd,PROCESS_ACL))
break;
mysqld_list_processes(thd,
thd->master_access & PROCESS_ACL ? NullS :
thd->priv_user,lex->verbose);
break;
case SQLCOM_SHOW_STORAGE_ENGINES:
res= mysqld_show_storage_engines(thd);
break;
case SQLCOM_SHOW_PRIVILEGES:
res= mysqld_show_privileges(thd);
break;
case SQLCOM_SHOW_COLUMN_TYPES:
res= mysqld_show_column_types(thd);
break;
case SQLCOM_SHOW_STATUS:
res= mysqld_show(thd,(lex->wild ? lex->wild->ptr() : NullS),status_vars,
OPT_GLOBAL, &LOCK_status);
break;
case SQLCOM_SHOW_VARIABLES:
res= mysqld_show(thd, (lex->wild ? lex->wild->ptr() : NullS),
init_vars, lex->option_type,
&LOCK_global_system_variables);
break;
case SQLCOM_SHOW_LOGS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
DBUG_VOID_RETURN;
#else
{
if (grant_option && check_access(thd, FILE_ACL, any_db,0,0,0))
goto error;
res= mysqld_show_logs(thd);
break;
}
#endif
case SQLCOM_SHOW_TABLES:
/* FALL THROUGH */
#ifdef DONT_ALLOW_SHOW_COMMANDS
send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
DBUG_VOID_RETURN;
#else
{
char *db=select_lex->db ? select_lex->db : thd->db;
if (!db)
{
send_error(thd,ER_NO_DB_ERROR); /* purecov: inspected */
goto error; /* purecov: inspected */
}
remove_escape(db); // Fix escaped '_'
if (check_db_name(db))
{
net_printf(thd,ER_WRONG_DB_NAME, db);
goto error;
}
if (check_access(thd,SELECT_ACL,db,&thd->col_access,0,0))
goto error; /* purecov: inspected */
if (!thd->col_access && check_grant_db(thd,db))
{
net_printf(thd, ER_DBACCESS_DENIED_ERROR,
thd->priv_user,
thd->priv_host,
db);
goto error;
}
/* grant is checked in mysqld_show_tables */
if (lex->describe)
res= mysqld_extend_show_tables(thd,db,
(lex->wild ? lex->wild->ptr() : NullS));
else
res= mysqld_show_tables(thd,db,
(lex->wild ? lex->wild->ptr() : NullS));
break;
}
#endif
case SQLCOM_SHOW_OPEN_TABLES:
res= mysqld_show_open_tables(thd,(lex->wild ? lex->wild->ptr() : NullS));
break;
case SQLCOM_SHOW_CHARSETS:
res= mysqld_show_charsets(thd,(lex->wild ? lex->wild->ptr() : NullS));
break;
case SQLCOM_SHOW_COLLATIONS:
res= mysqld_show_collations(thd,(lex->wild ? lex->wild->ptr() : NullS));
break;
case SQLCOM_SHOW_FIELDS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
DBUG_VOID_RETURN;
#else
{
char *db=tables->db;
remove_escape(db); // Fix escaped '_'
remove_escape(tables->real_name);
if (check_access(thd,SELECT_ACL | EXTRA_ACL,db,
&tables->grant.privilege, 0, 0))
goto error; /* purecov: inspected */
if (grant_option && check_grant(thd, SELECT_ACL, tables, 2, UINT_MAX, 0))
goto error;
res= mysqld_show_fields(thd,tables,
(lex->wild ? lex->wild->ptr() : NullS),
lex->verbose);
break;
}
#endif
case SQLCOM_SHOW_KEYS:
#ifdef DONT_ALLOW_SHOW_COMMANDS
send_error(thd,ER_NOT_ALLOWED_COMMAND); /* purecov: inspected */
DBUG_VOID_RETURN;
#else
{
char *db=tables->db;
remove_escape(db); // Fix escaped '_'
remove_escape(tables->real_name);
if (check_access(thd,SELECT_ACL | EXTRA_ACL,db,
&tables->grant.privilege, 0, 0))
goto error; /* purecov: inspected */
if (grant_option && check_grant(thd, SELECT_ACL, tables, 2, UINT_MAX, 0))
goto error;
res= mysqld_show_keys(thd,tables);
break;
}
#endif
case SQLCOM_CHANGE_DB:
mysql_change_db(thd,select_lex->db);
break;
case SQLCOM_LOAD:
{
uint privilege= (lex->duplicates == DUP_REPLACE ?
INSERT_ACL | DELETE_ACL : INSERT_ACL);
if (!lex->local_file)
{
if (check_access(thd,privilege | FILE_ACL,tables->db,0,0,0))
goto error;
}
else
{
if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) ||
! opt_local_infile)
{
send_error(thd,ER_NOT_ALLOWED_COMMAND);
goto error;
}
if (check_one_table_access(thd, privilege, tables))
goto error;
}
res=mysql_load(thd, lex->exchange, tables, lex->field_list,
lex->duplicates, (bool) lex->local_file, lex->lock_option);
break;
}
case SQLCOM_SET_OPTION:
{
List<set_var_base> *lex_var_list= &lex->var_list;
if (tables && ((res= check_table_access(thd, SELECT_ACL, tables,0)) ||
(res= open_and_lock_tables(thd,tables))))
break;
if (lex->one_shot_set && not_all_support_one_shot(lex_var_list))
{
my_printf_error(0, "The SET ONE_SHOT syntax is reserved for \
purposes internal to the MySQL server", MYF(0));
res= -1;
break;
}
if (!(res= sql_set_variables(thd, lex_var_list)))
{
/*
If the previous command was a SET ONE_SHOT, we don't want to forget
about the ONE_SHOT property of that SET. So we use a |= instead of = .
*/
thd->one_shot_set|= lex->one_shot_set;
send_ok(thd);
}
if (thd->net.report_error)
res= -1;
break;
}
case SQLCOM_UNLOCK_TABLES:
unlock_locked_tables(thd);
if (thd->options & OPTION_TABLE_LOCK)
{
end_active_trans(thd);
thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
}
if (thd->global_read_lock)
unlock_global_read_lock(thd);
send_ok(thd);
break;
case SQLCOM_LOCK_TABLES:
unlock_locked_tables(thd);
if (check_db_used(thd,tables) || end_active_trans(thd))
goto error;
if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, tables,0))
goto error;
thd->in_lock_tables=1;
thd->options|= OPTION_TABLE_LOCK;
if (!(res= open_and_lock_tables(thd, tables)))
{
#ifdef HAVE_QUERY_CACHE
if (thd->variables.query_cache_wlock_invalidate)
query_cache.invalidate_locked_for_write(tables);
#endif /*HAVE_QUERY_CACHE*/
thd->locked_tables=thd->lock;
thd->lock=0;
send_ok(thd);
}
else
thd->options&= ~(ulong) (OPTION_TABLE_LOCK);
thd->in_lock_tables=0;
break;
case SQLCOM_CREATE_DB:
{
char *alias;
if (!(alias=thd->strdup(lex->name)) || check_db_name(lex->name))
{
net_printf(thd,ER_WRONG_DB_NAME, lex->name);
break;
}
/*
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.
*/
#ifdef HAVE_REPLICATION
if (thd->slave_thread &&
(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
!db_ok_with_wild_table(lex->name)))
{
my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
break;
}
#endif
if (check_access(thd,CREATE_ACL,lex->name,0,1,0))
break;
res= mysql_create_db(thd,(lower_case_table_names == 2 ? alias : lex->name),
&lex->create_info, 0);
break;
}
case SQLCOM_DROP_DB:
{
char *alias;
if (!(alias=thd->strdup(lex->name)) || check_db_name(lex->name))
{
net_printf(thd, ER_WRONG_DB_NAME, lex->name);
break;
}
/*
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.
*/
#ifdef HAVE_REPLICATION
if (thd->slave_thread &&
(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
!db_ok_with_wild_table(lex->name)))
{
my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
break;
}
#endif
if (check_access(thd,DROP_ACL,lex->name,0,1,0))
break;
if (thd->locked_tables || thd->active_transaction())
{
send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
goto error;
}
res=mysql_rm_db(thd, (lower_case_table_names == 2 ? alias : lex->name),
lex->drop_if_exists, 0);
break;
}
case SQLCOM_ALTER_DB:
{
if (!strip_sp(lex->name) || check_db_name(lex->name))
{
net_printf(thd, ER_WRONG_DB_NAME, lex->name);
break;
}
/*
If in a slave thread :
ALTER 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.
*/
#ifdef HAVE_REPLICATION
if (thd->slave_thread &&
(!db_ok(lex->name, replicate_do_db, replicate_ignore_db) ||
!db_ok_with_wild_table(lex->name)))
{
my_error(ER_SLAVE_IGNORED_TABLE, MYF(0));
break;
}
#endif
if (check_access(thd,ALTER_ACL,lex->name,0,1,0))
break;
if (thd->locked_tables || thd->active_transaction())
{
send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
goto error;
}
res=mysql_alter_db(thd,lex->name,&lex->create_info);
break;
}
case SQLCOM_SHOW_CREATE_DB:
{
if (!strip_sp(lex->name) || check_db_name(lex->name))
{
net_printf(thd,ER_WRONG_DB_NAME, lex->name);
break;
}
if (check_access(thd,SELECT_ACL,lex->name,0,1,0))
break;
if (thd->locked_tables || thd->active_transaction())
{
send_error(thd,ER_LOCK_OR_ACTIVE_TRANSACTION);
goto error;
}
res=mysqld_show_create_db(thd,lex->name,&lex->create_info);
break;
}
case SQLCOM_CREATE_FUNCTION:
if (check_access(thd,INSERT_ACL,"mysql",0,1,0))
break;
#ifdef HAVE_DLOPEN
if (!(res = mysql_create_function(thd,&lex->udf)))
send_ok(thd);
#else
res= -1;
#endif
break;
case SQLCOM_DROP_FUNCTION:
if (check_access(thd,DELETE_ACL,"mysql",0,1,0))
break;
#ifdef HAVE_DLOPEN
if (!(res = mysql_drop_function(thd,&lex->udf.name)))
send_ok(thd);
#else
res= -1;
#endif
break;
#ifndef NO_EMBEDDED_ACCESS_CHECKS
case SQLCOM_DROP_USER:
{
if (check_access(thd, GRANT_ACL,"mysql",0,1,0))
break;
if (!(res= mysql_drop_user(thd, lex->users_list)))
{
mysql_update_log.write(thd, thd->query, thd->query_length);
if (mysql_bin_log.is_open())
{
Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
mysql_bin_log.write(&qinfo);
}
send_ok(thd);
}
break;
}
case SQLCOM_REVOKE_ALL:
{
if (check_access(thd, GRANT_ACL ,"mysql",0,1,0))
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;
}
case SQLCOM_REVOKE:
case SQLCOM_GRANT:
{
if (check_access(thd, lex->grant | lex->grant_tot_col | GRANT_ACL,
tables && tables->db ? tables->db : select_lex->db,
tables ? &tables->grant.privilege : 0,
tables ? 0 : 1,0))
goto error;
/*
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
*/
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 &&
my_strcasecmp(&my_charset_latin1,
user->host.str, thd->host_or_ip)))
{
if (check_access(thd, UPDATE_ACL, "mysql",0,1,0))
goto error;
break; // We are allowed to do changes
}
}
}
if (specialflag & SPECIAL_NO_RESOLVE)
{
LEX_USER *user;
List_iterator <LEX_USER> user_list(lex->users_list);
while ((user=user_list++))
{
if (hostname_requires_resolving(user->host.str))
push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
ER_WARN_HOSTNAME_WONT_WORK,
ER(ER_WARN_HOSTNAME_WONT_WORK),
user->host.str);
}
}
if (tables)
{
if (grant_option && check_grant(thd,
(lex->grant | lex->grant_tot_col |
GRANT_ACL),
tables, 0, UINT_MAX, 0))
goto error;
if (!(res = mysql_table_grant(thd,tables,lex->users_list, lex->columns,
lex->grant,
lex->sql_command == SQLCOM_REVOKE)))
{
mysql_update_log.write(thd, thd->query, thd->query_length);
if (mysql_bin_log.is_open())
{
thd->clear_error();
Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
mysql_bin_log.write(&qinfo);
}
}
}
else
{
if (lex->columns.elements)
{
send_error(thd,ER_ILLEGAL_GRANT_FOR_TABLE);
res=1;
}
else
res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant,
lex->sql_command == SQLCOM_REVOKE);
if (!res)
{
mysql_update_log.write(thd, thd->query, thd->query_length);
if (mysql_bin_log.is_open())
{
thd->clear_error();
Query_log_event qinfo(thd, thd->query, thd->query_length, 0);
mysql_bin_log.write(&qinfo);
}
if (mqh_used && lex->sql_command == SQLCOM_GRANT)
{
List_iterator <LEX_USER> str_list(lex->users_list);
LEX_USER *user;
while ((user=str_list++))
reset_mqh(thd,user);
}
}
}
break;
}
#endif /*!NO_EMBEDDED_ACCESS_CHECKS*/
case SQLCOM_RESET:
/*
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:
{
if (check_global_access(thd,RELOAD_ACL) || check_db_used(thd, tables))
goto error;
/*
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);
}
break;
}
case SQLCOM_KILL:
kill_one_thread(thd,lex->thread_id);
break;
#ifndef NO_EMBEDDED_ACCESS_CHECKS
case SQLCOM_SHOW_GRANTS:
res=0;
if ((thd->priv_user &&
!strcmp(thd->priv_user,lex->grant_user->user.str)) ||
!check_access(thd, SELECT_ACL, "mysql",0,1,0))
{
res = mysql_show_grants(thd,lex->grant_user);
}
break;
#endif
case SQLCOM_HA_OPEN:
if (check_db_used(thd,tables) ||
check_table_access(thd,SELECT_ACL, tables,0))
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:
/*
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.
*/
if (check_db_used(thd,tables))
goto error;
res = mysql_ha_read(thd, tables, lex->ha_read_mode, lex->backup_dir,
lex->insert_list, lex->ha_rkey_mode, select_lex->where,
select_lex->select_limit, select_lex->offset_limit);
break;
case SQLCOM_BEGIN:
if (thd->locked_tables)
{
thd->lock=thd->locked_tables;
thd->locked_tables=0; // Will be automaticly closed
close_thread_tables(thd); // Free tables
}
if (end_active_trans(thd))
{
res= -1;
}
else
{
thd->options= ((thd->options & (ulong) ~(OPTION_STATUS_NO_TRANS_UPDATE)) |
OPTION_BEGIN);
thd->server_status|= SERVER_STATUS_IN_TRANS;
send_ok(thd);
}
break;
case SQLCOM_COMMIT:
/*
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...)
*/
{
thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
thd->server_status&= ~SERVER_STATUS_IN_TRANS;
if (!ha_commit(thd))
{
send_ok(thd);
}
else
res= -1;
break;
}
case SQLCOM_ROLLBACK:
thd->server_status&= ~SERVER_STATUS_IN_TRANS;
if (!ha_rollback(thd))
{
/*
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)
send_warning(thd,ER_WARNING_NOT_COMPLETE_ROLLBACK,0);
else
send_ok(thd);
}
else
res= -1;
thd->options&= ~(ulong) (OPTION_BEGIN | OPTION_STATUS_NO_TRANS_UPDATE);
break;
case SQLCOM_ROLLBACK_TO_SAVEPOINT:
if (!ha_rollback_to_savepoint(thd, lex->savepoint_name))
{
if ((thd->options & OPTION_STATUS_NO_TRANS_UPDATE) && !thd->slave_thread)
send_warning(thd, ER_WARNING_NOT_COMPLETE_ROLLBACK, 0);
else
send_ok(thd);
}
else
res= -1;
break;
case SQLCOM_SAVEPOINT:
if (!ha_savepoint(thd, lex->savepoint_name))
send_ok(thd);
else
res= -1;
break;
default: /* Impossible */
send_ok(thd);
break;
}
thd->proc_info="query end"; // QQ
if (thd->one_shot_set)
{
/*
If this is a SET, do nothing. This is to allow mysqlbinlog to print
many SET commands (in this case we want the charset temp setting to
live until the real query). This is also needed so that SET
CHARACTER_SET_CLIENT... does not cancel itself immediately.
*/
if (lex->sql_command != SQLCOM_SET_OPTION)
{
thd->variables.character_set_client=
global_system_variables.character_set_client;
thd->variables.collation_connection=
global_system_variables.collation_connection;
thd->variables.collation_database=
global_system_variables.collation_database;
thd->variables.collation_server=
global_system_variables.collation_server;
thd->update_charset();
thd->variables.time_zone=
global_system_variables.time_zone;
thd->one_shot_set= 0;
}
}
if (res < 0)
send_error(thd,thd->killed ? ER_SERVER_SHUTDOWN : 0);
error:
DBUG_VOID_RETURN;
}
/*
Check grants for commands which work only with one table and all other
tables belong to subselects.
SYNOPSIS
check_one_table_access()
thd Thread handler
privilege requested privelage
tables table list of command
RETURN
0 - OK
1 - access denied, error is sent to client
*/
int check_one_table_access(THD *thd, ulong privilege, TABLE_LIST *tables)
{
if (check_access(thd, privilege, tables->db, &tables->grant.privilege,0,0))
return 1;
/* Show only 1 table for check_grant */
if (grant_option && check_grant(thd, privilege, tables, 0, 1, 0))
return 1;
/* Check rights on tables of subselect (if exists) */
TABLE_LIST *subselects_tables;
if ((subselects_tables= tables->next))
{
if ((check_table_access(thd, SELECT_ACL, subselects_tables,0)))
return 1;
}
return 0;
}
/****************************************************************************
Get the user (global) and database privileges for all used tables
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
is enough to satisfy the request and the global grants contains
a SELECT grant.
****************************************************************************/
bool
check_access(THD *thd, ulong want_access, const char *db, ulong *save_priv,
bool dont_check_global_grants, bool no_errors)
{
DBUG_ENTER("check_access");
DBUG_PRINT("enter",("want_access: %lu master_access: %lu", want_access,
thd->master_access));
#ifndef NO_EMBEDDED_ACCESS_CHECKS
ulong db_access;
#endif
ulong dummy;
if (save_priv)
*save_priv=0;
else
save_priv= &dummy;
if ((!db || !db[0]) && !thd->db && !dont_check_global_grants)
{
if (!no_errors)
send_error(thd,ER_NO_DB_ERROR); /* purecov: tested */
DBUG_RETURN(TRUE); /* purecov: tested */
}
#ifdef NO_EMBEDDED_ACCESS_CHECKS
DBUG_RETURN(0);
#else
if ((thd->master_access & want_access) == want_access)
{
/*
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,
thd->priv_user, db, test(want_access & GRANT_ACL));
*save_priv=thd->master_access | db_access;
DBUG_RETURN(FALSE);
}
if (((want_access & ~thd->master_access) & ~(DB_ACLS | EXTRA_ACL)) ||
! db && dont_check_global_grants)
{ // We can never grant this
if (!no_errors)
net_printf(thd,ER_ACCESS_DENIED_ERROR,
thd->priv_user,
thd->priv_host,
thd->password ? ER(ER_YES) : ER(ER_NO));/* purecov: tested */
DBUG_RETURN(TRUE); /* purecov: tested */
}
if (db == any_db)
DBUG_RETURN(FALSE); // Allow select on anything
if (db && (!thd->db || strcmp(db,thd->db)))
db_access=acl_get(thd->host, thd->ip,
thd->priv_user, db, test(want_access & GRANT_ACL));
else
db_access=thd->db_access;
// Remove SHOW attribute and access rights we already have
want_access &= ~(thd->master_access | EXTRA_ACL);
db_access= ((*save_priv=(db_access | thd->master_access)) & want_access);
/* grant_option is set if there exists a single table or column grant */
if (db_access == want_access ||
((grant_option && !dont_check_global_grants) &&
!(want_access & ~(db_access | TABLE_ACLS))))
DBUG_RETURN(FALSE); /* Ok */
if (!no_errors)
net_printf(thd,ER_DBACCESS_DENIED_ERROR,
thd->priv_user,
thd->priv_host,
db ? db : thd->db ? thd->db : "unknown"); /* purecov: tested */
DBUG_RETURN(TRUE); /* purecov: tested */
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
}
/*
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
*/
bool check_global_access(THD *thd, ulong want_access)
{
#ifdef NO_EMBEDDED_ACCESS_CHECKS
return 0;
#else
char command[128];
if ((thd->master_access & want_access))
return 0;
get_privilege_desc(command, sizeof(command), want_access);
net_printf(thd,ER_SPECIFIC_ACCESS_DENIED_ERROR,
command);
return 1;
#endif /* NO_EMBEDDED_ACCESS_CHECKS */
}
/*
Check the privilege for all used tables. Table privileges are cached
in the table list for GRANT checking
*/
bool
check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables,
bool no_errors)
{
uint found=0;
ulong found_access=0;
TABLE_LIST *org_tables=tables;
for (; tables ; tables=tables->next)
{
if (tables->derived || (tables->table && (int)tables->table->tmp_table))
continue;
if ((thd->master_access & want_access) == (want_access & ~EXTRA_ACL) &&
thd->db)
tables->grant.privilege= want_access;
else if (tables->db && tables->db == thd->db)
{
if (found && !grant_option) // db already checked
tables->grant.privilege=found_access;
else
{
if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
0, no_errors))
return TRUE; // Access denied
found_access=tables->grant.privilege;
found=1;
}
}
else if (check_access(thd,want_access,tables->db,&tables->grant.privilege,
0, no_errors))
return TRUE;
}
if (grant_option)
return check_grant(thd,want_access & ~EXTRA_ACL,org_tables,
test(want_access & EXTRA_ACL), UINT_MAX, no_errors);
return FALSE;
}
bool check_merge_table_access(THD *thd, char *db,
TABLE_LIST *table_list)
{
int error=0;
if (table_list)
{
/* Check that all tables use the current database */
TABLE_LIST *tmp;
for (tmp=table_list; tmp ; tmp=tmp->next)
{
if (!tmp->db || !tmp->db[0])
tmp->db=db;
}
error=check_table_access(thd, SELECT_ACL | UPDATE_ACL | DELETE_ACL,
table_list,0);
}
return error;
}
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;
}
/****************************************************************************
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
#ifndef DBUG_OFF
long max_stack_used;
#endif
#ifndef EMBEDDED_LIBRARY
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));
thd->fatal_error();
return 1;
}
#ifndef DBUG_OFF
max_stack_used= max(max_stack_used, stack_used);
#endif
return 0;
}
#endif /* EMBEDDED_LIBRARY */
#define MY_YACC_INIT 1000 // Start with big alloc
#define MY_YACC_MAX 32000 // Because of 'short'
bool my_yyoverflow(short **yyss, YYSTYPE **yyvs, ulong *yystacksize)
{
LEX *lex=current_lex;
ulong 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;
}
/****************************************************************************
Initialize global thd variables needed for query
****************************************************************************/
void
mysql_init_query(THD *thd, uchar *buf, uint length)
{
DBUG_ENTER("mysql_init_query");
LEX *lex= thd->lex;
lex->unit.init_query();
lex->unit.init_select();
lex->unit.thd= thd;
lex->select_lex.init_query();
lex->value_list.empty();
lex->param_list.empty();
lex->unit.next= lex->unit.master=
lex->unit.link_next= lex->unit.return_to=0;
lex->unit.prev= lex->unit.link_prev= 0;
lex->unit.slave= lex->unit.global_parameters= lex->current_select=
lex->all_selects_list= &lex->select_lex;
lex->select_lex.master= &lex->unit;
lex->select_lex.prev= &lex->unit.slave;
lex->select_lex.link_next= lex->select_lex.slave= lex->select_lex.next= 0;
lex->select_lex.link_prev= (st_select_lex_node**)&(lex->all_selects_list);
lex->select_lex.options=0;
lex->describe= 0;
lex->derived_tables= FALSE;
lex->lock_option= TL_READ;
lex->found_colon= 0;
lex->safe_to_cache_query= 1;
lex->time_zone_tables_used= 0;
lex_start(thd, buf, length);
thd->select_number= lex->select_lex.select_number= 1;
thd->free_list= 0;
thd->total_warn_count=0; // Warnings for this query
thd->last_insert_id_used= thd->query_start_used= thd->insert_id_used=0;
thd->sent_row_count= thd->examined_row_count= 0;
thd->is_fatal_error= thd->rand_used= thd->time_zone_used= 0;
thd->server_status&= ~ (SERVER_MORE_RESULTS_EXISTS |
SERVER_QUERY_NO_INDEX_USED |
SERVER_QUERY_NO_GOOD_INDEX_USED);
thd->tmp_table_used= 0;
if (opt_bin_log)
reset_dynamic(&thd->user_var_events);
thd->clear_error();
DBUG_VOID_RETURN;
}
void
mysql_init_select(LEX *lex)
{
SELECT_LEX *select_lex= lex->current_select;
select_lex->init_select();
select_lex->select_limit= HA_POS_ERROR;
if (select_lex == &lex->select_lex)
{
DBUG_ASSERT(lex->result == 0);
lex->exchange= 0;
lex->proc_list.first= 0;
}
}
bool
mysql_new_select(LEX *lex, bool move_down)
{
SELECT_LEX *select_lex = new(&lex->thd->mem_root) SELECT_LEX();
if (!select_lex)
return 1;
select_lex->select_number= ++lex->thd->select_number;
select_lex->init_query();
select_lex->init_select();
if (move_down)
{
/* first select_lex of subselect or derived table */
SELECT_LEX_UNIT *unit= new(&lex->thd->mem_root) SELECT_LEX_UNIT();
if (!unit)
return 1;
unit->init_query();
unit->init_select();
unit->thd= lex->thd;
unit->include_down(lex->current_select);
unit->link_next= 0;
unit->link_prev= 0;
unit->return_to= lex->current_select;
select_lex->include_down(unit);
// TODO: assign resolve_mode for fake subquery after merging with new tree
}
else
{
select_lex->include_neighbour(lex->current_select);
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
*/
fake= unit->fake_select_lex= new(&lex->thd->mem_root) SELECT_LEX();
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= HA_POS_ERROR;
}
}
select_lex->master_unit()->global_parameters= select_lex;
select_lex->include_global((st_select_lex_node**)&lex->all_selects_list);
lex->current_select= select_lex;
select_lex->resolve_mode= SELECT_LEX::SELECT_MODE;
return 0;
}
/*
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)
{
THD *thd;
LEX *lex;
LEX_STRING tmp, null_lex_string;
DBUG_ENTER("create_select_for_variable");
thd= current_thd;
lex= thd->lex;
mysql_init_select(lex);
lex->sql_command= SQLCOM_SELECT;
tmp.str= (char*) var_name;
tmp.length=strlen(var_name);
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));
DBUG_VOID_RETURN;
}
void mysql_init_multi_delete(LEX *lex)
{
lex->sql_command= SQLCOM_DELETE_MULTI;
mysql_init_select(lex);
lex->select_lex.select_limit= lex->unit.select_limit_cnt=
HA_POS_ERROR;
lex->select_lex.table_list.save_and_clear(&lex->auxilliary_table_list);
}
/*
When you modify mysql_parse(), you may need to mofify
mysql_test_parse_for_slave() in this same file.
*/
void mysql_parse(THD *thd, char *inBuf, uint length)
{
DBUG_ENTER("mysql_parse");
mysql_init_query(thd, (uchar*) inBuf, length);
if (query_cache_send_result_to_client(thd, inBuf, length) <= 0)
{
LEX *lex= thd->lex;
if (!yyparse((void *)thd) && ! thd->is_fatal_error)
{
#ifndef NO_EMBEDDED_ACCESS_CHECKS
if (mqh_used && thd->user_connect &&
check_mqh(thd, lex->sql_command))
{
thd->net.error = 0;
}
else
#endif
{
if (thd->net.report_error)
send_error(thd, 0, NullS);
else
{
mysql_execute_command(thd);
query_cache_end_of_result(thd);
}
}
}
else
{
DBUG_PRINT("info",("Command aborted. Fatal_error: %d",
thd->is_fatal_error));
query_cache_abort(&thd->net);
}
thd->proc_info="freeing items";
thd->end_statement();
}
DBUG_VOID_RETURN;
}
#ifdef HAVE_REPLICATION
/*
Usable by the replication SQL thread only: just parse a query to know if it
can be ignored because of replicate-*-table rules.
RETURN VALUES
0 cannot be ignored
1 can be ignored
*/
bool mysql_test_parse_for_slave(THD *thd, char *inBuf, uint length)
{
LEX *lex= thd->lex;
bool error= 0;
mysql_init_query(thd, (uchar*) inBuf, length);
if (!yyparse((void*) thd) && ! thd->is_fatal_error &&
all_tables_not_ok(thd,(TABLE_LIST*) lex->select_lex.table_list.first))
error= 1; /* Ignore question */
thd->end_statement();
return error;
}
#endif
/*****************************************************************************
** Store field definition for create
** Return 0 if ok
******************************************************************************/
bool add_field_to_list(THD *thd, char *field_name, enum_field_types type,
char *length, char *decimals,
uint type_modifier,
Item *default_value, Item *on_update_value,
LEX_STRING *comment,
char *change, TYPELIB *interval, CHARSET_INFO *cs,
uint uint_geom_type)
{
register create_field *new_field;
LEX *lex= thd->lex;
uint allowed_type_modifier=0;
char warn_buff[MYSQL_ERRMSG_SIZE];
DBUG_ENTER("add_field_to_list");
if (strlen(field_name) > NAME_LEN)
{
net_printf(thd, ER_TOO_LONG_IDENT, field_name); /* purecov: inspected */
DBUG_RETURN(1); /* purecov: inspected */
}
if (type_modifier & PRI_KEY_FLAG)
{
lex->col_list.push_back(new key_part_spec(field_name,0));
lex->key_list.push_back(new Key(Key::PRIMARY, NullS, HA_KEY_ALG_UNDEF,
0, 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));
lex->key_list.push_back(new Key(Key::UNIQUE, NullS, HA_KEY_ALG_UNDEF, 0,
lex->col_list));
lex->col_list.empty();
}
if (default_value)
{
/*
Default value should be literal => basic constants =>
no need fix_fields()
We allow only one function as part of default value -
NOW() as default for TIMESTAMP type.
*/
if (default_value->type() == Item::FUNC_ITEM &&
!(((Item_func*)default_value)->functype() == Item_func::NOW_FUNC &&
type == FIELD_TYPE_TIMESTAMP))
{
net_printf(thd, ER_INVALID_DEFAULT, field_name);
DBUG_RETURN(1);
}
else if (default_value->type() == Item::NULL_ITEM)
{
/*
TIMESTAMP type should be able to distingush non-specified default
value and default value NULL later.
*/
if (type != FIELD_TYPE_TIMESTAMP)
default_value= 0;
if ((type_modifier & (NOT_NULL_FLAG | AUTO_INCREMENT_FLAG)) ==
NOT_NULL_FLAG)
{
net_printf(thd,ER_INVALID_DEFAULT,field_name);
DBUG_RETURN(1);
}
}
else if (type_modifier & AUTO_INCREMENT_FLAG)
{
net_printf(thd, ER_INVALID_DEFAULT, field_name);
DBUG_RETURN(1);
}
}
if (on_update_value && type != FIELD_TYPE_TIMESTAMP)
{
net_printf(thd, ER_INVALID_ON_UPDATE, field_name);
DBUG_RETURN(1);
}
if (!(new_field=new create_field()))
DBUG_RETURN(1);
new_field->field=0;
new_field->field_name=field_name;
new_field->def= default_value;
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;
new_field->charset=cs;
new_field->geom_type= (Field::geometry_type) uint_geom_type;
if (!comment)
{
new_field->comment.str=0;
new_field->comment.length=0;
}
else
{
/* In this case comment is always of type Item_string */
new_field->comment.str= (char*) comment->str;
new_field->comment.length=comment->length;
}
if (length && !(new_field->length= (uint) atoi(length)))
length=0; /* purecov: inspected */
uint sign_len=type_modifier & UNSIGNED_FLAG ? 0 : 1;
if (new_field->length && new_field->decimals &&
new_field->length < new_field->decimals+1 &&
new_field->decimals != NOT_FIXED_DEC)
new_field->length=new_field->decimals+1; /* purecov: inspected */
switch (type) {
case FIELD_TYPE_TINY:
if (!length) new_field->length=MAX_TINYINT_WIDTH+sign_len;
allowed_type_modifier= AUTO_INCREMENT_FLAG;
break;
case FIELD_TYPE_SHORT:
if (!length) new_field->length=MAX_SMALLINT_WIDTH+sign_len;
allowed_type_modifier= AUTO_INCREMENT_FLAG;
break;
case FIELD_TYPE_INT24:
if (!length) new_field->length=MAX_MEDIUMINT_WIDTH+sign_len;
allowed_type_modifier= AUTO_INCREMENT_FLAG;
break;
case FIELD_TYPE_LONG:
if (!length) new_field->length=MAX_INT_WIDTH+sign_len;
allowed_type_modifier= AUTO_INCREMENT_FLAG;
break;
case FIELD_TYPE_LONGLONG:
if (!length) new_field->length=MAX_BIGINT_WIDTH;
allowed_type_modifier= AUTO_INCREMENT_FLAG;
break;
case FIELD_TYPE_NULL:
break;
case FIELD_TYPE_DECIMAL:
if (!length)
{
if ((new_field->length= new_field->decimals))
new_field->length++;
else
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++;
}
break;
case FIELD_TYPE_STRING:
case FIELD_TYPE_VAR_STRING:
if (new_field->length <= MAX_FIELD_CHARLENGTH || default_value)
break;
/* Convert long CHAR() and VARCHAR columns to TEXT or BLOB */
new_field->sql_type= FIELD_TYPE_BLOB;
sprintf(warn_buff, ER(ER_AUTO_CONVERT), field_name, "CHAR",
(cs == &my_charset_bin) ? "BLOB" : "TEXT");
push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_AUTO_CONVERT,
warn_buff);
/* fall through */
case FIELD_TYPE_BLOB:
case FIELD_TYPE_TINY_BLOB:
case FIELD_TYPE_LONG_BLOB:
case FIELD_TYPE_MEDIUM_BLOB:
case FIELD_TYPE_GEOMETRY:
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;
if (default_value) // Allow empty as default value
{
String str,*res;
res=default_value->val_str(&str);
if (res->length())
{
net_printf(thd,ER_BLOB_CANT_HAVE_DEFAULT,field_name); /* purecov: inspected */
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)
{
net_printf(thd,ER_WRONG_FIELD_SPEC,field_name);
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 if (new_field->length != 19)
{
/*
We support only even TIMESTAMP lengths less or equal than 14
and 19 as length of 4.1 compatible representation.
*/
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;
if (default_value)
{
/* Grammar allows only NOW() value for ON UPDATE clause */
if (default_value->type() == Item::FUNC_ITEM &&
((Item_func*)default_value)->functype() == Item_func::NOW_FUNC)
{
new_field->unireg_check= (on_update_value?Field::TIMESTAMP_DNUN_FIELD:
Field::TIMESTAMP_DN_FIELD);
/*
We don't need default value any longer moreover it is dangerous.
Everything handled by unireg_check further.
*/
new_field->def= 0;
}
else
new_field->unireg_check= (on_update_value?Field::TIMESTAMP_UN_FIELD:
Field::NONE);
if (default_value->type() == Item::NULL_ITEM)
new_field->def= 0;
}
else
{
/*
We are setting TIMESTAMP_OLD_FIELD here only temporary, we will
replace this value by TIMESTAMP_DNUN_FIELD or NONE later when
information about all TIMESTAMP fields in table will be availiable.
*/
new_field->unireg_check= on_update_value?Field::TIMESTAMP_UN_FIELD:
Field::TIMESTAMP_OLD_FIELD;
}
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)
{
net_printf(thd,ER_TOO_BIG_SET,field_name); /* purecov: inspected */
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++)
{
uint length= (uint) strip_sp((char*) *pos)+1;
CHARSET_INFO *cs= thd->variables.character_set_client;
length= cs->cset->numchars(cs, *pos, *pos+length);
new_field->length+= length;
}
new_field->length--;
set_if_smaller(new_field->length,MAX_FIELD_WIDTH-1);
if (default_value)
{
char *not_used;
uint not_used2;
bool not_used3;
thd->cuted_fields=0;
String str,*res;
res=default_value->val_str(&str);
(void) find_set(interval, res->ptr(), res->length(), &not_used,
&not_used2, &not_used3);
if (thd->cuted_fields)
{
net_printf(thd,ER_INVALID_DEFAULT,field_name);
DBUG_RETURN(1);
}
}
}
break;
case FIELD_TYPE_ENUM:
{
new_field->interval=interval;
new_field->pack_length=interval->count < 256 ? 1 : 2; // Should be safe
new_field->length=(uint) strip_sp((char*) interval->type_names[0]);
for (const char **pos=interval->type_names+1; *pos ; pos++)
{
uint length=(uint) strip_sp((char*) *pos);
CHARSET_INFO *cs= thd->variables.character_set_client;
length= cs->cset->numchars(cs, *pos, *pos+length);
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);
res->strip_sp();
if (!find_type(interval, res->ptr(), res->length(), 0))
{
net_printf(thd,ER_INVALID_DEFAULT,field_name);
DBUG_RETURN(1);
}
}
break;
}
}
if ((new_field->length > MAX_FIELD_CHARLENGTH && type != FIELD_TYPE_SET &&
type != FIELD_TYPE_ENUM) ||
(!new_field->length && !(new_field->flags & BLOB_FLAG) &&
type != FIELD_TYPE_STRING &&
type != FIELD_TYPE_VAR_STRING && type != FIELD_TYPE_GEOMETRY))
{
net_printf(thd,ER_TOO_BIG_FIELDLENGTH,field_name,
MAX_FIELD_CHARLENGTH); /* purecov: inspected */
DBUG_RETURN(1); /* purecov: inspected */
}
type_modifier&= AUTO_INCREMENT_FLAG;
if ((~allowed_type_modifier) & type_modifier)
{
net_printf(thd,ER_WRONG_FIELD_SPEC,field_name);
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
add_proc_to_list(THD* thd, Item *item)
{
ORDER *order;
Item **item_ptr;
if (!(order = (ORDER *) thd->alloc(sizeof(ORDER)+sizeof(Item*))))
return 1;
item_ptr = (Item**) (order+1);
*item_ptr= item;
order->item=item_ptr;
order->free_me=0;
thd->lex->proc_list.link_in_list((byte*) order,(byte**) &order->next);
return 0;
}
/* Fix escaping of _, % and \ in database and table names (for ODBC) */
static void remove_escape(char *name)
{
if (!*name) // For empty DB names
return;
char *to;
#ifdef USE_MB
char *strend=name+(uint) strlen(name);
#endif
for (to=name; *name ; name++)
{
#ifdef USE_MB
int l;
/* if ((l = ismbchar(name, name+MBMAXLEN))) { Wei He: I think it's wrong */
if (use_mb(system_charset_info) &&
(l = my_ismbchar(system_charset_info, name, strend)))
{
while (l--)
*to++ = *name++;
name--;
continue;
}
#endif
if (*name == '\\' && name[1])
name++; // Skip '\\'
*to++= *name;
}
*to=0;
}
/****************************************************************************
** save order by and tables in own lists
****************************************************************************/
bool add_to_list(THD *thd, SQL_LIST &list,Item *item,bool asc)
{
ORDER *order;
DBUG_ENTER("add_to_list");
if (!(order = (ORDER *) thd->alloc(sizeof(ORDER))))
DBUG_RETURN(1);
order->item_ptr= item;
order->item= &order->item_ptr;
order->asc = asc;
order->free_me=0;
order->used=0;
list.link_in_list((byte*) order,(byte**) &order->next);
DBUG_RETURN(0);
}
/*
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
*/
TABLE_LIST *st_select_lex::add_table_to_list(THD *thd,
Table_ident *table,
LEX_STRING *alias,
ulong table_options,
thr_lock_type lock_type,
List<String> *use_index_arg,
List<String> *ignore_index_arg,
LEX_STRING *option)
{
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;
if (check_table_name(table->table.str,table->table.length) ||
table->db.str && check_db_name(table->db.str))
{
net_printf(thd, ER_WRONG_TABLE_NAME, table->table.str);
DBUG_RETURN(0);
}
if (!alias) /* Alias is case sensitive */
{
if (table->sel)
{
net_printf(thd,ER_DERIVED_MUST_HAVE_ALIAS);
DBUG_RETURN(0);
}
if (!(alias_str=thd->memdup(alias_str,table->table.length+1)))
DBUG_RETURN(0);
}
if (!(ptr = (TABLE_LIST *) thd->calloc(sizeof(TABLE_LIST))))
DBUG_RETURN(0); /* purecov: inspected */
if (table->db.str)
{
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
{
/* The following can't be "" as we may do 'casedn_str()' on it */
ptr->db= empty_c_string;
ptr->db_length= 0;
}
ptr->alias= alias_str;
if (lower_case_table_names && table->table.length)
my_casedn_str(files_charset_info, table->table.str);
ptr->real_name=table->table.str;
ptr->real_name_length=table->table.length;
ptr->lock_type= lock_type;
ptr->updating= test(table_options & TL_OPTION_UPDATING);
ptr->force_index= test(table_options & TL_OPTION_FORCE_INDEX);
ptr->ignore_leaves= test(table_options & TL_OPTION_IGNORE_LEAVES);
ptr->derived= table->sel;
ptr->cacheable_table= 1;
if (use_index_arg)
ptr->use_index=(List<String> *) thd->memdup((gptr) use_index_arg,
sizeof(*use_index_arg));
if (ignore_index_arg)
ptr->ignore_index=(List<String> *) thd->memdup((gptr) ignore_index_arg,
sizeof(*ignore_index_arg));
ptr->option= option ? option->str : 0;
/* check that used name is unique */
if (lock_type != TL_IGNORE)
{
for (TABLE_LIST *tables=(TABLE_LIST*) table_list.first ;
tables ;
tables=tables->next)
{
if (!my_strcasecmp(table_alias_charset, alias_str, tables->alias) &&
!strcmp(ptr->db, tables->db))
{
net_printf(thd,ER_NONUNIQ_TABLE,alias_str); /* purecov: tested */
DBUG_RETURN(0); /* purecov: tested */
}
}
}
table_list.link_in_list((byte*) ptr, (byte**) &ptr->next);
DBUG_RETURN(ptr);
}
/*
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
*/
void st_select_lex::set_lock_for_tables(thr_lock_type lock_type)
{
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));
for (TABLE_LIST *tables= (TABLE_LIST*) table_list.first ;
tables ;
tables=tables->next)
{
tables->lock_type= lock_type;
tables->updating= for_update;
}
DBUG_VOID_RETURN;
}
void add_join_on(TABLE_LIST *b,Item *expr)
{
if (expr)
{
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();
}
}
/*
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 ... )
*/
void add_join_natural(TABLE_LIST *a,TABLE_LIST *b)
{
b->natural_join=a;
}
/*
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
*/
bool reload_acl_and_cache(THD *thd, ulong options, TABLE_LIST *tables,
bool *write_to_binlog)
{
bool result=0;
select_errors=0; /* Write if more errors */
bool tmp_write_to_binlog= 1;
#ifndef NO_EMBEDDED_ACCESS_CHECKS
if (options & REFRESH_GRANT)
{
acl_reload(thd);
grant_reload(thd);
if (mqh_used)
reset_mqh(thd,(LEX_USER *) NULL,true);
}
#endif
if (options & REFRESH_LOG)
{
/*
Flush the normal query log, the update log, the binary log,
the slow query log, and the relay log (if it exists).
*/
/*
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;
mysql_log.new_file(1);
mysql_update_log.new_file(1);
mysql_bin_log.new_file(1);
mysql_slow_log.new_file(1);
#ifdef HAVE_REPLICATION
if (mysql_bin_log.is_open() && expire_logs_days)
{
long purge_time= time(0) - expire_logs_days*24*60*60;
if (purge_time >= 0)
mysql_bin_log.purge_logs_before_date(purge_time);
}
pthread_mutex_lock(&LOCK_active_mi);
rotate_relay_log(active_mi);
pthread_mutex_unlock(&LOCK_active_mi);
#endif
if (ha_flush_logs())
result=1;
if (flush_error_log())
result=1;
}
#ifdef HAVE_QUERY_CACHE
if (options & REFRESH_QUERY_CACHE_FREE)
{
query_cache.pack(); // FLUSH QUERY CACHE
options &= ~REFRESH_QUERY_CACHE; //don't flush all cache, just free memory
}
if (options & (REFRESH_TABLES | REFRESH_QUERY_CACHE))
{
query_cache.flush(); // RESET QUERY CACHE
}
#endif /*HAVE_QUERY_CACHE*/
/*
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))
{
if ((options & REFRESH_READ_LOCK) && thd)
{
/*
Writing to the binlog could cause deadlocks, as we don't log
UNLOCK TABLES
*/
tmp_write_to_binlog= 0;
if (lock_global_read_lock(thd))
return 1;
result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1,
tables);
make_global_read_lock_block_commit(thd);
}
else
result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1, tables);
my_dbopt_cleanup();
}
if (options & REFRESH_HOSTS)
hostname_cache_refresh();
if (options & REFRESH_STATUS)
refresh_status();
if (options & REFRESH_THREADS)
flush_thread_cache();
#ifdef HAVE_REPLICATION
if (options & REFRESH_MASTER)
{
tmp_write_to_binlog= 0;
if (reset_master(thd))
result=1;
}
#endif
#ifdef OPENSSL
if (options & REFRESH_DES_KEY_FILE)
{
if (des_key_file)
result=load_des_key_file(des_key_file);
}
#endif
#ifdef HAVE_REPLICATION
if (options & REFRESH_SLAVE)
{
tmp_write_to_binlog= 0;
pthread_mutex_lock(&LOCK_active_mi);
if (reset_slave(thd, active_mi))
result=1;
pthread_mutex_unlock(&LOCK_active_mi);
}
#endif
if (options & REFRESH_USER_RESOURCES)
reset_mqh(thd,(LEX_USER *) NULL);
if (write_to_binlog)
*write_to_binlog= tmp_write_to_binlog;
return result;
}
/*
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
*/
void kill_one_thread(THD *thd, ulong id)
{
THD *tmp;
uint error=ER_NO_SUCH_THREAD;
VOID(pthread_mutex_lock(&LOCK_thread_count)); // For unlink from list
I_List_iterator<THD> it(threads);
while ((tmp=it++))
{
if (tmp->thread_id == id)
{
pthread_mutex_lock(&tmp->LOCK_delete); // Lock from delete
break;
}
}
VOID(pthread_mutex_unlock(&LOCK_thread_count));
if (tmp)
{
if ((thd->master_access & SUPER_ACL) ||
!strcmp(thd->user,tmp->user))
{
tmp->awake(1 /*prepare to die*/);
error=0;
}
else
error=ER_KILL_DENIED_ERROR;
pthread_mutex_unlock(&tmp->LOCK_delete);
}
if (!error)
send_ok(thd);
else
net_printf(thd,error,id);
}
/* Clear most status variables */
static void refresh_status(void)
{
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;
else if (ptr->type == SHOW_KEY_CACHE_LONG)
{
/*
Reset value in 'default' key cache.
This needs to be recoded when we have thread specific key values
*/
char *value= (((char*) sql_key_cache) +
(uint) ((char*) (ptr->value) -
(char*) &dflt_key_cache_var));
*(ulong*) value= 0;
}
}
pthread_mutex_unlock(&LOCK_status);
}
/* If pointer is not a null pointer, append filename to it */
static bool append_file_to_dir(THD *thd, const char **filename_ptr,
const char *table_name)
{
char buff[FN_REFLEN],*ptr, *end;
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);
end=convert_dirname(buff, *filename_ptr, NullS);
if (!(ptr=thd->alloc((uint) (end-buff)+(uint) strlen(table_name)+1)))
return 1; // End of memory
*filename_ptr=ptr;
strxmov(ptr,buff,table_name,NullS);
return 0;
}
/*
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;
if (thd->lex->current_select != &thd->lex->select_lex)
{
char command[80];
strmake(command, thd->lex->yylval->symbol.str,
min(thd->lex->yylval->symbol.length, sizeof(command)-1));
net_printf(thd, ER_CANT_USE_OPTION_HERE, command);
return 1;
}
return 0;
}
Comp_creator *comp_eq_creator(bool invert)
{
return invert?(Comp_creator *)&ne_creator:(Comp_creator *)&eq_creator;
}
Comp_creator *comp_ge_creator(bool invert)
{
return invert?(Comp_creator *)&lt_creator:(Comp_creator *)&ge_creator;
}
Comp_creator *comp_gt_creator(bool invert)
{
return invert?(Comp_creator *)&le_creator:(Comp_creator *)&gt_creator;
}
Comp_creator *comp_le_creator(bool invert)
{
return invert?(Comp_creator *)&gt_creator:(Comp_creator *)&le_creator;
}
Comp_creator *comp_lt_creator(bool invert)
{
return invert?(Comp_creator *)&ge_creator:(Comp_creator *)&lt_creator;
}
Comp_creator *comp_ne_creator(bool invert)
{
return invert?(Comp_creator *)&eq_creator:(Comp_creator *)&ne_creator;
}
/*
Construct ALL/ANY/SOME subquery Item
SYNOPSIS
all_any_subquery_creator()
left_expr - pointer to left expression
cmp - compare function creator
all - true if we create ALL subquery
select_lex - pointer on parsed subquery structure
RETURN VALUE
constructed Item (or 0 if out of memory)
*/
Item * all_any_subquery_creator(Item *left_expr,
chooser_compare_func_creator cmp,
bool all,
SELECT_LEX *select_lex)
{
if ((cmp == &comp_eq_creator) && !all) // = ANY <=> IN
return new Item_in_subselect(left_expr, select_lex);
if ((cmp == &comp_ne_creator) && all) // <> ALL <=> NOT IN
return new Item_func_not(new Item_in_subselect(left_expr, select_lex));
Item_allany_subselect *it=
new Item_allany_subselect(left_expr, (*cmp)(all), select_lex, all);
if (all)
return it->upper_not= new Item_func_not_all(it); /* ALL */
return it; /* ANY/SOME */
}
/*
CREATE INDEX and DROP INDEX are implemented by calling ALTER TABLE with
the proper arguments. This isn't very fast but it should work for most
cases.
In the future ALTER TABLE will notice that only added indexes
and create these one by one for the existing table without having to do
a full rebuild.
One should normally create all indexes with CREATE TABLE or ALTER TABLE.
*/
int mysql_create_index(THD *thd, TABLE_LIST *table_list, List<Key> &keys)
{
List<create_field> fields;
ALTER_INFO alter_info;
alter_info.flags= ALTER_ADD_INDEX;
alter_info.is_simple= 0;
HA_CREATE_INFO create_info;
DBUG_ENTER("mysql_create_index");
bzero((char*) &create_info,sizeof(create_info));
create_info.db_type=DB_TYPE_DEFAULT;
create_info.default_table_charset= thd->variables.collation_database;
DBUG_RETURN(mysql_alter_table(thd,table_list->db,table_list->real_name,
&create_info, table_list,
fields, keys, 0, (ORDER*)0,
DUP_ERROR, &alter_info));
}
int mysql_drop_index(THD *thd, TABLE_LIST *table_list, ALTER_INFO *alter_info)
{
List<create_field> fields;
List<Key> keys;
HA_CREATE_INFO create_info;
DBUG_ENTER("mysql_drop_index");
bzero((char*) &create_info,sizeof(create_info));
create_info.db_type=DB_TYPE_DEFAULT;
create_info.default_table_charset= thd->variables.collation_database;
alter_info->clear();
alter_info->flags= ALTER_DROP_INDEX;
alter_info->is_simple= 0;
DBUG_RETURN(mysql_alter_table(thd,table_list->db,table_list->real_name,
&create_info, table_list,
fields, keys, 0, (ORDER*)0,
DUP_ERROR, alter_info));
}
/*
Multi update query pre-check
SYNOPSIS
multi_update_precheck()
thd Thread handler
tables Global table list
RETURN VALUE
0 OK
1 Error (message is sent to user)
-1 Error (message is not sent to user)
*/
int multi_update_precheck(THD *thd, TABLE_LIST *tables)
{
DBUG_ENTER("multi_update_precheck");
const char *msg= 0;
TABLE_LIST *table;
LEX *lex= thd->lex;
SELECT_LEX *select_lex= &lex->select_lex;
TABLE_LIST *update_list= (TABLE_LIST*)select_lex->table_list.first;
if (select_lex->item_list.elements != lex->value_list.elements)
{
my_error(ER_WRONG_VALUE_COUNT, MYF(0));
DBUG_RETURN(-1);
}
/*
Ensure that we have UPDATE or SELECT privilege for each table
The exact privilege is checked in mysql_multi_update()
*/
for (table= update_list; table; table= table->next)
{
if ((check_access(thd, UPDATE_ACL, table->db,
&table->grant.privilege, 0, 1) ||
grant_option && check_grant(thd, UPDATE_ACL, table, 0, 1, 1)) &&
(check_access(thd, SELECT_ACL, table->db,
&table->grant.privilege, 0, 0) ||
grant_option && check_grant(thd, SELECT_ACL, table, 0, 1, 0)))
DBUG_RETURN(1);
/*
We assign following flag only to copy of table, because it will
be checked only if query contains subqueries i.e. only if copy exists
*/
if (table->table_list)
table->table_list->table_in_update_from_clause= 1;
}
/*
Is there tables of subqueries?
*/
if (&lex->select_lex != lex->all_selects_list)
{
for (table= tables; table; table= table->next)
{
if (table->table_in_update_from_clause)
{
/*
If we check table by local TABLE_LIST copy then we should copy
grants to global table list, because it will be used for table
opening.
*/
if (table->table_list)
table->grant= table->table_list->grant;
}
else
{
if (check_access(thd, SELECT_ACL, table->db,
&table->grant.privilege, 0, 0) ||
grant_option && check_grant(thd, SELECT_ACL, table, 0, 1, 0))
DBUG_RETURN(1);
}
}
}
if (select_lex->order_list.elements)
msg= "ORDER BY";
else if (select_lex->select_limit && select_lex->select_limit !=
HA_POS_ERROR)
msg= "LIMIT";
if (msg)
{
my_error(ER_WRONG_USAGE, MYF(0), "UPDATE", msg);
DBUG_RETURN(-1);
}
DBUG_RETURN(0);
}
/*
Multi delete query pre-check
SYNOPSIS
multi_delete_precheck()
thd Thread handler
tables Global table list
table_count Pointer to table counter
RETURN VALUE
0 OK
1 error (message is sent to user)
-1 error (message is not sent to user)
*/
int multi_delete_precheck(THD *thd, TABLE_LIST *tables, uint *table_count)
{
DBUG_ENTER("multi_delete_precheck");
SELECT_LEX *select_lex= &thd->lex->select_lex;
TABLE_LIST *aux_tables=
(TABLE_LIST *)thd->lex->auxilliary_table_list.first;
TABLE_LIST *delete_tables= (TABLE_LIST *)select_lex->table_list.first;
TABLE_LIST *target_tbl;
*table_count= 0;
/* sql_yacc guarantees that tables and aux_tables are not zero */
DBUG_ASSERT(aux_tables != 0);
if (check_db_used(thd, tables) || check_db_used(thd,aux_tables) ||
check_table_access(thd,SELECT_ACL, tables,0) ||
check_table_access(thd,DELETE_ACL, aux_tables,0))
DBUG_RETURN(1);
if ((thd->options & OPTION_SAFE_UPDATES) && !select_lex->where)
{
my_error(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE, MYF(0));
DBUG_RETURN(-1);
}
for (target_tbl= aux_tables; target_tbl; target_tbl= target_tbl->next)
{
(*table_count)++;
/* All tables in aux_tables must be found in FROM PART */
TABLE_LIST *walk;
for (walk= delete_tables; walk; walk= walk->next)
{
if (!my_strcasecmp(table_alias_charset,
target_tbl->alias, walk->alias) &&
!strcmp(walk->db, target_tbl->db))
break;
}
if (!walk)
{
my_error(ER_UNKNOWN_TABLE, MYF(0), target_tbl->real_name,
"MULTI DELETE");
DBUG_RETURN(-1);
}
if (walk->derived)
{
my_error(ER_NON_UPDATABLE_TABLE, MYF(0), target_tbl->real_name,
"DELETE");
DBUG_RETURN(-1);
}
walk->lock_type= target_tbl->lock_type;
target_tbl->table_list= walk; // Remember corresponding table
}
DBUG_RETURN(0);
}
/*
INSERT ... SELECT query pre-check
SYNOPSIS
multi_delete_precheck()
thd Thread handler
tables Global table list
RETURN VALUE
0 OK
1 Error (message is sent to user)
-1 Error (message is not sent to user)
*/
int insert_select_precheck(THD *thd, TABLE_LIST *tables)
{
DBUG_ENTER("insert_select_precheck");
/*
Check that we have modify privileges for the first table and
select privileges for the rest
*/
ulong privilege= (thd->lex->duplicates == DUP_REPLACE ?
INSERT_ACL | DELETE_ACL : INSERT_ACL);
DBUG_RETURN(check_one_table_access(thd, privilege, tables) ? 1 : 0);
}
/*
simple UPDATE query pre-check
SYNOPSIS
update_precheck()
thd Thread handler
tables Global table list
RETURN VALUE
0 OK
1 Error (message is sent to user)
-1 Error (message is not sent to user)
*/
int update_precheck(THD *thd, TABLE_LIST *tables)
{
DBUG_ENTER("update_precheck");
if (thd->lex->select_lex.item_list.elements != thd->lex->value_list.elements)
{
my_error(ER_WRONG_VALUE_COUNT, MYF(0));
DBUG_RETURN(-1);
}
DBUG_RETURN((check_db_used(thd, tables) ||
check_one_table_access(thd, UPDATE_ACL, tables)) ? 1 : 0);
}
/*
simple DELETE query pre-check
SYNOPSIS
delete_precheck()
thd Thread handler
tables Global table list
RETURN VALUE
0 OK
1 error (message is sent to user)
-1 error (message is not sent to user)
*/
int delete_precheck(THD *thd, TABLE_LIST *tables)
{
DBUG_ENTER("delete_precheck");
if (check_one_table_access(thd, DELETE_ACL, tables))
DBUG_RETURN(1);
/* Set privilege for the WHERE clause */
tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege);
DBUG_RETURN(0);
}
/*
simple INSERT query pre-check
SYNOPSIS
insert_precheck()
thd Thread handler
tables Global table list
RETURN VALUE
0 OK
1 error (message is sent to user)
-1 error (message is not sent to user)
*/
int insert_precheck(THD *thd, TABLE_LIST *tables, bool update)
{
LEX *lex= thd->lex;
DBUG_ENTER("insert_precheck");
ulong privilege= (lex->duplicates == DUP_REPLACE ?
INSERT_ACL | DELETE_ACL : INSERT_ACL | update);
if (check_one_table_access(thd, privilege, tables))
DBUG_RETURN(1);
if (lex->select_lex.item_list.elements != lex->value_list.elements)
{
my_error(ER_WRONG_VALUE_COUNT, MYF(0));
DBUG_RETURN(-1);
}
DBUG_RETURN(0);
}
/*
CREATE TABLE query pre-check
SYNOPSIS
create_table_precheck()
thd Thread handler
tables Global table list
create_table Table which will be created
RETURN VALUE
0 OK
1 Error (message is sent to user)
-1 Error (message is not sent to user)
*/
int create_table_precheck(THD *thd, TABLE_LIST *tables,
TABLE_LIST *create_table)
{
LEX *lex= thd->lex;
DBUG_ENTER("create_table_precheck");
ulong want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ?
CREATE_TMP_ACL : CREATE_ACL);
lex->create_info.alias= create_table->alias;
if (check_access(thd, want_priv, create_table->db,
&create_table->grant.privilege, 0, 0) ||
check_merge_table_access(thd, create_table->db,
(TABLE_LIST *)
lex->create_info.merge_list.first))
DBUG_RETURN(1);
DBUG_RETURN((grant_option && want_priv != CREATE_TMP_ACL &&
check_grant(thd, want_priv, create_table, 0, UINT_MAX, 0)) ?
1 : 0);
}
/*
negate given expression
SYNOPSIS
negate_expression()
thd therad handler
expr expression for negation
RETURN
negated expression
*/
Item *negate_expression(THD *thd, Item *expr)
{
Item *negated;
if (expr->type() == Item::FUNC_ITEM &&
((Item_func *) expr)->functype() == Item_func::NOT_FUNC)
{
/* it is NOT(NOT( ... )) */
Item *arg= ((Item_func *) expr)->arguments()[0];
enum_parsing_place place= thd->lex->current_select->parsing_place;
if (arg->is_bool_func() || place == IN_WHERE || place == IN_HAVING)
return arg;
/*
if it is not boolean function then we have to emulate value of
not(not(a)), it will be a != 0
*/
return new Item_func_ne(arg, new Item_int((char*) "0", 0, 1));
}
if ((negated= expr->neg_transformer(thd)) != 0)
return negated;
return new Item_func_not(expr);
}
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