/* 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; version 2 of the License. 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 */ #define MYSQL_LEX 1 #include "mysql_priv.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_NDBCLUSTER_DB #include "ha_ndbcluster.h" #endif #include "sp_head.h" #include "sp.h" #include "sp_cache.h" #include "sql_trigger.h" #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 */ /* Used in error handling only */ #define SP_TYPE_STRING(LP) \ ((LP)->sphead->m_type == TYPE_ENUM_FUNCTION ? "FUNCTION" : "PROCEDURE") #define SP_COM_STRING(LP) \ ((LP)->sql_command == SQLCOM_CREATE_SPFUNCTION || \ (LP)->sql_command == SQLCOM_ALTER_FUNCTION || \ (LP)->sql_command == SQLCOM_SHOW_CREATE_FUNC || \ (LP)->sql_command == SQLCOM_DROP_FUNCTION ? \ "FUNCTION" : "PROCEDURE") #ifdef SOLARIS extern "C" int gethostname(char *name, int namelen); #endif #ifndef NO_EMBEDDED_ACCESS_CHECKS static void time_out_user_resource_limits(THD *thd, USER_CONN *uc); static int check_for_max_user_connections(THD *thd, USER_CONN *uc); static void decrease_user_connections(USER_CONN *uc); #endif /* NO_EMBEDDED_ACCESS_CHECKS */ static bool check_db_used(THD *thd,TABLE_LIST *tables); static void remove_escape(char *name); 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", "Execute", "Long Data", "Close stmt", "Reset stmt", "Set option", "Fetch", "Error" // Last command number }; const char *xa_state_names[]={ "NON-EXISTING", "ACTIVE", "IDLE", "PREPARED" }; #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 automatically closed close_thread_tables(thd); // Free tables } } static bool end_active_trans(THD *thd) { int error=0; DBUG_ENTER("end_active_trans"); if (unlikely(thd->in_sub_stmt)) { my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0)); DBUG_RETURN(1); } if (thd->transaction.xid_state.xa_state != XA_NOTR) { my_error(ER_XAER_RMFAIL, MYF(0), xa_state_names[thd->transaction.xid_state.xa_state]); DBUG_RETURN(1); } if (thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN | OPTION_TABLE_LOCK)) { DBUG_PRINT("info",("options: 0x%lx", (ulong) thd->options)); /* Safety if one did "drop table" on locked tables */ if (!thd->locked_tables) thd->options&= ~OPTION_TABLE_LOCK; thd->server_status&= ~SERVER_STATUS_IN_TRANS; if (ha_commit(thd)) error=1; thd->options&= ~(ulong) OPTION_BEGIN; thd->no_trans_update.all= FALSE; } DBUG_RETURN(error); } static bool begin_trans(THD *thd) { int error=0; if (unlikely(thd->in_sub_stmt)) { my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0)); return 1; } if (thd->locked_tables) { thd->lock=thd->locked_tables; thd->locked_tables=0; // Will be automatically closed close_thread_tables(thd); // Free tables } if (end_active_trans(thd)) error= -1; else { LEX *lex= thd->lex; thd->no_trans_update.all= FALSE; thd->options|= (ulong) OPTION_BEGIN; thd->server_status|= SERVER_STATUS_IN_TRANS; if (lex->start_transaction_opt & MYSQL_START_TRANS_OPT_WITH_CONS_SNAPSHOT) error= ha_start_consistent_snapshot(thd); } return error; } #ifdef HAVE_REPLICATION /* Returns true if all tables should be ignored */ inline bool all_tables_not_ok(THD *thd, TABLE_LIST *tables) { return table_rules_on && tables && !tables_ok(thd,tables); } #endif static bool some_non_temp_table_to_be_updated(THD *thd, TABLE_LIST *tables) { for (TABLE_LIST *table= tables; table; table= table->next_global) { DBUG_ASSERT(table->db && table->table_name); if (table->updating && !find_temporary_table(thd, table->db, table->table_name)) return 1; } return 0; } #ifndef NO_EMBEDDED_ACCESS_CHECKS 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[USER_HOST_BUFF_SIZE]; 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))))) { net_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->host= uc->user + user_len + 1; uc->len= temp_len; uc->connections= uc->questions= uc->updates= uc->conn_per_hour= 0; uc->user_resources= *mqh; uc->intime= thd->thr_create_time; if (my_hash_insert(&hash_user_connections, (byte*) uc)) { my_free((char*) uc,0); net_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; } #endif /* !NO_EMBEDDED_ACCESS_CHECKS */ /* Check if user exist and password supplied is correct. SYNOPSIS check_user() thd thread handle, thd->security_ctx->{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 received 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 depend 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->security_ctx->user/master_access/priv_user/db_access and thd->db 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"); LEX_STRING db_str= { (char *) db, db ? strlen(db) : 0 }; #ifdef NO_EMBEDDED_ACCESS_CHECKS thd->main_security_ctx.master_access= GLOBAL_ACLS; // Full rights /* Change database if necessary */ if (db && db[0]) { /* thd->db is saved in caller and needs to be freed by caller if this function returns 0 */ thd->reset_db(NULL, 0); if (mysql_change_db(thd, &db_str, FALSE)) { /* Send the error to the client */ net_send_error(thd); DBUG_RETURN(-1); } } 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_error(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 accidentally free a wrong pointer if connect failed. Also in case of 'CHANGE USER' failure, current database will be switched to 'no database selected'. */ thd->reset_db(NULL, 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_error(thd, ER_SERVER_IS_IN_SECURE_AUTH_MODE, thd->main_security_ctx.user, thd->main_security_ctx.host_or_ip); mysql_log.write(thd, COM_CONNECT, ER(ER_SERVER_IS_IN_SECURE_AUTH_MODE), thd->main_security_ctx.user, thd->main_security_ctx.host_or_ip); DBUG_RETURN(-1); } /* We have to read very specific packet size */ if (send_old_password_request(thd) || my_net_read(net) != SCRAMBLE_LENGTH_323 + 1) { 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->main_security_ctx.master_access & NO_ACCESS)) // authentication is OK { DBUG_PRINT("info", ("Capabilities: %lu packet_length: %ld Host: '%s' " "Login user: '%s' Priv_user: '%s' Using password: %s " "Access: %lu db: '%s'", thd->client_capabilities, thd->max_client_packet_length, thd->main_security_ctx.host_or_ip, thd->main_security_ctx.user, thd->main_security_ctx.priv_user, passwd_len ? "yes": "no", thd->main_security_ctx.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->main_security_ctx.master_access & SUPER_ACL); VOID(pthread_mutex_unlock(&LOCK_thread_count)); if (!count_ok) { // too many connections net_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->main_security_ctx.priv_user == thd->main_security_ctx.user ? (char*) "%s@%s on %s" : (char*) "%s@%s as anonymous on %s"), thd->main_security_ctx.user, thd->main_security_ctx.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->main_security_ctx.db_access=0; /* Don't allow user to connect if he has done too many queries */ if ((ur.questions || ur.updates || ur.conn_per_hour || ur.user_conn || max_user_connections) && get_or_create_user_conn(thd, (opt_old_style_user_limits ? thd->main_security_ctx.user : thd->main_security_ctx.priv_user), (opt_old_style_user_limits ? thd->main_security_ctx.host_or_ip : thd->main_security_ctx.priv_host), &ur)) DBUG_RETURN(-1); if (thd->user_connect && (thd->user_connect->user_resources.conn_per_hour || thd->user_connect->user_resources.user_conn || max_user_connections) && check_for_max_user_connections(thd, thd->user_connect)) DBUG_RETURN(-1); /* Change database if necessary */ if (db && db[0]) { if (mysql_change_db(thd, &db_str, FALSE)) { /* Send error to the client */ net_send_error(thd); if (thd->user_connect) decrease_user_connections(thd->user_connect); DBUG_RETURN(-1); } } 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_error(thd, ER_NOT_SUPPORTED_AUTH_MODE); mysql_log.write(thd,COM_CONNECT,ER(ER_NOT_SUPPORTED_AUTH_MODE)); DBUG_RETURN(-1); } net_printf_error(thd, ER_ACCESS_DENIED_ERROR, thd->main_security_ctx.user, thd->main_security_ctx.host_or_ip, passwd_len ? ER(ER_YES) : ER(ER_NO)); mysql_log.write(thd, COM_CONNECT, ER(ER_ACCESS_DENIED_ERROR), thd->main_security_ctx.user, thd->main_security_ctx.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) { #ifndef NO_EMBEDDED_ACCESS_CHECKS (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); #endif } /* 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 && !uc->user_resources.user_conn && max_user_connections < (uint) uc->connections) { net_printf_error(thd, ER_TOO_MANY_USER_CONNECTIONS, uc->user); error=1; goto end; } time_out_user_resource_limits(thd, uc); if (uc->user_resources.user_conn && uc->user_resources.user_conn < uc->connections) { net_printf_error(thd, ER_USER_LIMIT_REACHED, uc->user, "max_user_connections", (long) uc->user_resources.user_conn); error= 1; goto end; } if (uc->user_resources.conn_per_hour && uc->user_resources.conn_per_hour <= uc->conn_per_hour) { net_printf_error(thd, ER_USER_LIMIT_REACHED, uc->user, "max_connections_per_hour", (long) uc->user_resources.conn_per_hour); 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); } /* 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; } #endif /* NO_EMBEDDED_ACCESS_CHECKS */ void free_max_user_conn(void) { #ifndef NO_EMBEDDED_ACCESS_CHECKS hash_free(&hash_user_connections); #endif /* NO_EMBEDDED_ACCESS_CHECKS */ } /* Mark all commands that somehow changes a table This is used to check number of updates / hour sql_command is actually set to SQLCOM_END sometimes so we need the +1 to include it in the array. numbers are: 0 - read-only query != 0 - query that may change a table 2 - query that returns meaningful ROW_COUNT() - a number of modified rows */ char uc_update_queries[SQLCOM_END+1]; void init_update_queries(void) { bzero((gptr) &uc_update_queries, sizeof(uc_update_queries)); 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]=2; uc_update_queries[SQLCOM_UPDATE_MULTI]=2; uc_update_queries[SQLCOM_INSERT]=2; uc_update_queries[SQLCOM_INSERT_SELECT]=2; uc_update_queries[SQLCOM_DELETE]=2; uc_update_queries[SQLCOM_DELETE_MULTI]=2; 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]=2; uc_update_queries[SQLCOM_REPLACE_SELECT]=2; 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_DROP_INDEX]=1; uc_update_queries[SQLCOM_CREATE_VIEW]=1; uc_update_queries[SQLCOM_DROP_VIEW]=1; } bool is_update_query(enum enum_sql_command command) { DBUG_ASSERT(command >= 0 && command <= SQLCOM_END); return uc_update_queries[command] != 0; } /* Reset per-hour user resource limits when it has been more than an hour since they were last checked SYNOPSIS: time_out_user_resource_limits() thd Thread handler uc User connection details NOTE: This assumes that the LOCK_user_conn mutex has been acquired, so it is safe to test and modify members of the USER_CONN structure. */ #ifndef NO_EMBEDDED_ACCESS_CHECKS static void time_out_user_resource_limits(THD *thd, USER_CONN *uc) { time_t check_time = thd->start_time ? thd->start_time : time(NULL); DBUG_ENTER("time_out_user_resource_limits"); /* If more than a hour since last check, reset resource checking */ if (check_time - uc->intime >= 3600) { uc->questions=1; uc->updates=0; uc->conn_per_hour=0; uc->intime=check_time; } DBUG_VOID_RETURN; } /* Check if maximum queries per hour limit has been reached returns 0 if OK. */ static bool check_mqh(THD *thd, uint check_command) { bool error= 0; USER_CONN *uc=thd->user_connect; DBUG_ENTER("check_mqh"); DBUG_ASSERT(uc != 0); (void) pthread_mutex_lock(&LOCK_user_conn); time_out_user_resource_limits(thd, uc); /* Check that we have not done too many questions / hour */ if (uc->user_resources.questions && uc->questions++ >= uc->user_resources.questions) { net_printf_error(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_error(thd, ER_USER_LIMIT_REACHED, uc->user, "max_updates", (long) uc->user_resources.updates); error=1; goto end; } } end: (void) pthread_mutex_unlock(&LOCK_user_conn); DBUG_RETURN(error); } #endif /* NO_EMBEDDED_ACCESS_CHECKS */ static void reset_mqh(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[USER_HOST_BUFF_SIZE]; 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 */ } void thd_init_client_charset(THD *thd, uint cs_number) { /* Use server character set and collation if - opt_character_set_client_handshake is not set - 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 (!opt_character_set_client_handshake || !(thd->variables.character_set_client= get_charset(cs_number, 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; } } /* 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; ulong pkt_len= 0; char *end; DBUG_PRINT("info", ("New connection received on %s", vio_description(net->vio))); #ifdef SIGNAL_WITH_VIO_CLOSE thd->set_active_vio(net->vio); #endif if (!thd->main_security_ctx.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->main_security_ctx.ip= my_strdup(ip,MYF(0)))) return (ER_OUT_OF_RESOURCES); thd->main_security_ctx.host_or_ip= thd->main_security_ctx.ip; vio_in_addr(net->vio,&thd->remote.sin_addr); if (!(specialflag & SPECIAL_NO_RESOLVE)) { vio_in_addr(net->vio,&thd->remote.sin_addr); thd->main_security_ctx.host= ip_to_hostname(&thd->remote.sin_addr, &connect_errors); /* Cut very long hostnames to avoid possible overflows */ if (thd->main_security_ctx.host) { if (thd->main_security_ctx.host != my_localhost) thd->main_security_ctx.host[min(strlen(thd->main_security_ctx.host), HOSTNAME_LENGTH)]= 0; thd->main_security_ctx.host_or_ip= thd->main_security_ctx.host; } if (connect_errors > max_connect_errors) return(ER_HOST_IS_BLOCKED); } DBUG_PRINT("info",("Host: %s ip: %s", (thd->main_security_ctx.host ? thd->main_security_ctx.host : "unknown host"), (thd->main_security_ctx.ip ? thd->main_security_ctx.ip : "unknown ip"))); if (acl_check_host(thd->main_security_ctx.host, thd->main_security_ctx.ip)) return(ER_HOST_NOT_PRIVILEGED); } else /* Hostname given means that the connection was on a socket */ { DBUG_PRINT("info",("Host: %s", thd->main_security_ctx.host)); thd->main_security_ctx.host_or_ip= thd->main_security_ctx.host; thd->main_security_ctx.ip= 0; /* Reset sin_addr */ bzero((char*) &thd->remote, sizeof(thd->remote)); } vio_keepalive(net->vio, TRUE); { /* 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 available! */ #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); 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])); thd_init_client_charset(thd, (uint) net->read_pos[8]); 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: %lu", 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, net->read_timeout)) { DBUG_PRINT("error", ("Failed to accept new SSL connection")); 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; char *user= end; char *passwd= strend(user)+1; uint user_len= passwd - 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 uint dummy_errors; /* 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; uint db_len= db ? strlen(db) : 0; if (passwd + passwd_len + db_len > (char *)net->read_pos + pkt_len) { inc_host_errors(&thd->remote.sin_addr); return ER_HANDSHAKE_ERROR; } /* 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, db_len, thd->charset(), &dummy_errors)]= 0; db= db_buff; } user_buff[user_len= copy_and_convert(user_buff, sizeof(user_buff)-1, system_charset_info, user, user_len, thd->charset(), &dummy_errors)]= '\0'; user= user_buff; /* If username starts and ends in "'", chop them off */ if (user_len > 1 && user[0] == '\'' && user[user_len - 1] == '\'') { user[user_len-1]= 0; user++; user_len-= 2; } if (thd->main_security_ctx.user) x_free(thd->main_security_ctx.user); if (!(thd->main_security_ctx.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; thd->net.no_send_error= 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_t handle_one_connection(void *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 %lu\n", thd->thread_id)); /* now that we've called my_thread_init(), it is safe to call DBUG_* */ #if defined(__WIN__) init_signals(); #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 thd->thread_stack= (char*) &thd; 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; Security_context *sctx= thd->security_ctx; net->no_send_error= 0; /* Use "connect_timeout" value during connection phase */ net_set_read_timeout(net, connect_timeout); net_set_write_timeout(net, connect_timeout); if ((error=check_connection(thd))) { // Wrong permissions if (error > 0) net_printf_error(thd, error, sctx->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(sctx->ip, sctx->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; thd->proc_info= 0; thd->command= COM_SLEEP; thd->init_for_queries(); if (sys_init_connect.value_length && !(sctx->master_access & SUPER_ACL)) { execute_init_command(thd, &sys_init_connect, &LOCK_sys_init_connect); if (thd->query_error) { thd->killed= THD::KILL_CONNECTION; sql_print_warning(ER(ER_NEW_ABORTING_CONNECTION), thd->thread_id,(thd->db ? thd->db : "unconnected"), sctx->user ? sctx->user : "unauthenticated", sctx->host_or_ip, "init_connect command failed"); sql_print_warning("%s", net->last_error); } thd->proc_info=0; thd->init_for_queries(); } /* Connect completed, set read/write timeouts back to tdefault */ net_set_read_timeout(net, thd->variables.net_read_timeout); net_set_write_timeout(net, thd->variables.net_write_timeout); while (!net->error && net->vio != 0 && !(thd->killed == THD::KILL_CONNECTION)) { net->no_send_error= 0; if (do_command(thd)) break; } if (thd->user_connect) decrease_user_connections(thd->user_connect); 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"), sctx->user ? sctx->user : "unauthenticated", sctx->host_or_ip, (net->last_errno ? ER(net->last_errno) : ER(ER_UNKNOWN_ERROR))); net_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; thd->thread_stack= (char*) &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 */ pthread_handler_t handle_bootstrap(void *arg) { THD *thd=(THD*) arg; FILE *file=bootstrap_file; char *buff; /* The following must be called before DBUG_ENTER */ thd->thread_stack= (char*) &thd; 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->security_ctx->priv_user= thd->security_ctx->user= (char*) my_strdup("boot", MYF(MY_WME)); /* Make the "client" handle multiple results. This is necessary to enable stored procedures with SELECTs and Dynamic SQL in init-file. */ thd->client_capabilities|= CLIENT_MULTI_RESULTS; buff= (char*) thd->net.buff; thd->init_for_queries(); while (fgets(buff, thd->net.max_packet, file)) { ulong length= (ulong) strlen(buff); while (buff[length-1] != '\n' && !feof(file)) { /* We got only a part of the current string. Will try to increase net buffer then read the rest of the current string. */ if (net_realloc(&(thd->net), 2 * thd->net.max_packet)) { net_send_error(thd, ER_NET_PACKET_TOO_LARGE, NullS); thd->fatal_error(); break; } buff= (char*) thd->net.buff; fgets(buff + length, thd->net.max_packet - length, file); length+= (ulong) strlen(buff + length); } if (thd->is_fatal_error) 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+QUERY_CACHE_FLAGS_SIZE); thd->query[length] = '\0'; DBUG_PRINT("query",("%-.4096s",thd->query)); /* We don't need to obtain LOCK_thread_count here because in bootstrap mode we have only one thread. */ thd->query_id=next_query_id(); thd->set_time(); mysql_parse(thd,thd->query,length); close_thread_tables(thd); // Free tables if (thd->is_fatal_error) break; if (thd->net.report_error) { /* The query failed, send error to log and abort bootstrap */ net_send_error(thd); thd->fatal_error(); break; } free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC)); #ifdef USING_TRANSACTIONS free_root(&thd->transaction.mem_root,MYF(MY_KEEP_PREALLOC)); #endif } end: /* Remember the exit code of bootstrap */ bootstrap_error= thd->is_fatal_error; net_end(&thd->net); thd->cleanup(); delete thd; #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); } /* This works because items are allocated with sql_alloc() */ void cleanup_items(Item *item) { DBUG_ENTER("cleanup_items"); for (; item ; item=item->next) item->cleanup(); DBUG_VOID_RETURN; } /* Handle COM_TABLE_DUMP command SYNOPSIS mysql_table_dump thd thread handle db database name or an empty string. If empty, the current database of the connection is used tbl_name name of the table to dump NOTES This function is written to handle one specific command only. RETURN VALUE 0 success 1 error, the error message is set in THD */ static int mysql_table_dump(THD* thd, char* db, char* tbl_name) { 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->table_name= table_list->alias= tbl_name; table_list->lock_type= TL_READ_NO_INSERT; table_list->prev_global= &table_list; // can be removed after merge with 4.1 if (!db || check_db_name(db)) { my_error(ER_WRONG_DB_NAME ,MYF(0), db ? db : "NULL"); goto err; } if (lower_case_table_names) my_casedn_str(files_charset_info, tbl_name); remove_escape(table_list->table_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_list, -1))) { my_error(ER_GET_ERRNO, MYF(0), my_errno); goto err; } net_flush(&thd->net); if ((error= table->file->dump(thd,-1))) my_error(ER_GET_ERRNO, MYF(0), error); err: DBUG_RETURN(error); } /* Ends the current transaction and (maybe) begin the next SYNOPSIS end_trans() thd Current thread completion Completion type RETURN 0 - OK */ int end_trans(THD *thd, enum enum_mysql_completiontype completion) { bool do_release= 0; int res= 0; DBUG_ENTER("end_trans"); if (unlikely(thd->in_sub_stmt)) { my_error(ER_COMMIT_NOT_ALLOWED_IN_SF_OR_TRG, MYF(0)); DBUG_RETURN(1); } if (thd->transaction.xid_state.xa_state != XA_NOTR) { my_error(ER_XAER_RMFAIL, MYF(0), xa_state_names[thd->transaction.xid_state.xa_state]); DBUG_RETURN(1); } switch (completion) { case 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->server_status&= ~SERVER_STATUS_IN_TRANS; res= ha_commit(thd); thd->options&= ~(ulong) OPTION_BEGIN; thd->no_trans_update.all= FALSE; break; case COMMIT_RELEASE: do_release= 1; /* fall through */ case COMMIT_AND_CHAIN: res= end_active_trans(thd); if (!res && completion == COMMIT_AND_CHAIN) res= begin_trans(thd); break; case ROLLBACK_RELEASE: do_release= 1; /* fall through */ case ROLLBACK: case ROLLBACK_AND_CHAIN: { thd->server_status&= ~SERVER_STATUS_IN_TRANS; if (ha_rollback(thd)) res= -1; thd->options&= ~(ulong) OPTION_BEGIN; thd->no_trans_update.all= FALSE; if (!res && (completion == ROLLBACK_AND_CHAIN)) res= begin_trans(thd); break; } default: res= -1; my_error(ER_UNKNOWN_COM_ERROR, MYF(0)); DBUG_RETURN(-1); } if (res < 0) my_error(thd->killed_errno(), MYF(0)); else if ((res == 0) && do_release) thd->killed= THD::KILL_CONNECTION; DBUG_RETURN(res); } #ifndef EMBEDDED_LIBRARY /* Read one command from connection 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= 0; ulong packet_length; NET *net= &thd->net; enum enum_server_command command; DBUG_ENTER("do_command"); /* indicator of uninitialized lex => normal flow of errors handling (see my_message_sql) */ thd->lex->current_select= 0; /* This thread will do a blocking read from the client which will be interrupted when the next command is received from the client, the connection is closed or "net_wait_timeout" number of seconds has passed */ net_set_read_timeout(net, 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. } net_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])); } /* Restore read timeout value */ net_set_read_timeout(net, thd->variables.net_read_timeout); /* 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"); if (thd->killed == THD::KILL_QUERY || thd->killed == THD::KILL_BAD_DATA) { thd->killed= THD::NOT_KILLED; thd->mysys_var->abort= 0; } thd->command=command; /* Commands which always take a long time are logged into the slow log only if opt_log_slow_admin_statements is set. */ thd->enable_slow_log= TRUE; thd->lex->sql_command= SQLCOM_END; /* to avoid confusing VIEW detectors */ thd->set_time(); VOID(pthread_mutex_lock(&LOCK_thread_count)); thd->query_id= global_query_id; if (command != COM_STATISTICS && command != COM_PING) next_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(thd->status_var.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, FALSE)) { mysql_log.write(thd,command,"%s",thd->db); send_ok(thd); } 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; if (db_len >= packet_length || db_len > NAME_LEN) { my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0)); break; } uint tbl_len= *(uchar*) (packet + db_len + 1); if (db_len+tbl_len+2 > packet_length || tbl_len > NAME_LEN) { my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0)); break; } statistic_increment(thd->status_var.com_other, &LOCK_status); thd->enable_slow_log= opt_log_slow_admin_statements; db= thd->alloc(db_len + tbl_len + 2); if (!db) { my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0)); break; } tbl_name= strmake(db, packet + 1, db_len)+1; strmake(tbl_name, packet + db_len + 2, tbl_len); mysql_table_dump(thd, db, tbl_name); break; } case COM_CHANGE_USER: { thd->change_user(); thd->clear_error(); // if errors from rollback statistic_increment(thd->status_var.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 incoming packet */ if ((uint) ((uchar*) db - net->read_pos) > packet_length) { my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0)); break; } #endif /* Convert database name to utf8 */ uint dummy_errors; db_buff[copy_and_convert(db_buff, sizeof(db_buff)-1, system_charset_info, db, strlen(db), thd->charset(), &dummy_errors)]= 0; db= db_buff; /* Save user and privileges */ uint save_db_length= thd->db_length; char *save_db= thd->db; Security_context save_security_ctx= *thd->security_ctx; USER_CONN *save_user_connect= thd->user_connect; if (!(thd->security_ctx->user= my_strdup(user, MYF(0)))) { thd->security_ctx->user= save_security_ctx.user; my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0)); 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) { /* authentication failure, we shall restore old user */ if (res > 0) my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0)); x_free(thd->security_ctx->user); *thd->security_ctx= save_security_ctx; thd->user_connect= save_user_connect; thd->db= save_db; thd->db_length= save_db_length; } else { #ifndef NO_EMBEDDED_ACCESS_CHECKS /* we've authenticated new user */ if (save_user_connect) decrease_user_connections(save_user_connect); #endif /* NO_EMBEDDED_ACCESS_CHECKS */ x_free((gptr) save_db); x_free((gptr) save_security_ctx.user); } break; } case COM_STMT_EXECUTE: { mysql_stmt_execute(thd, packet, packet_length); break; } case COM_STMT_FETCH: { mysql_stmt_fetch(thd, packet, packet_length); break; } case COM_STMT_SEND_LONG_DATA: { mysql_stmt_get_longdata(thd, packet, packet_length); break; } case COM_STMT_PREPARE: { mysql_stmt_prepare(thd, packet, packet_length); break; } case COM_STMT_CLOSE: { mysql_stmt_close(thd, packet); break; } case COM_STMT_RESET: { mysql_stmt_reset(thd, packet); break; } case COM_QUERY: { if (alloc_query(thd, packet, packet_length)) break; // fatal error is set char *packet_end= thd->query + thd->query_length; /* 'b' stands for 'buffer' parameter', special for 'my_snprintf' */ const char *format= "%.*b"; mysql_log.write(thd,command, format, thd->query_length, thd->query); DBUG_PRINT("query",("%-.4096s",thd->query)); if (!(specialflag & SPECIAL_NO_PRIOR)) my_pthread_setprio(pthread_self(),QUERY_PRIOR); mysql_parse(thd,thd->query, thd->query_length); while (!thd->killed && thd->lex->found_semicolon && !thd->net.report_error) { char *next_packet= thd->lex->found_semicolon; net->no_send_error= 0; /* Multiple queries exits, execute them individually */ if (thd->lock || thd->open_tables || thd->derived_tables || thd->prelocked_mode) close_thread_tables(thd); ulong length= (ulong)(packet_end - next_packet); log_slow_statement(thd); /* Remove garbage at start of query */ while (my_isspace(thd->charset(), *next_packet) && length > 0) { next_packet++; length--; } VOID(pthread_mutex_lock(&LOCK_thread_count)); thd->query_length= length; thd->query= next_packet; thd->query_id= next_query_id(); thd->set_time(); /* Reset the query start time. */ /* TODO: set thd->lex->sql_command to SQLCOM_END here */ VOID(pthread_mutex_unlock(&LOCK_thread_count)); mysql_parse(thd, next_packet, length); } 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 my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */ break; #else { char *fields, *pend; /* Locked closure of all tables */ TABLE_LIST table_list; LEX_STRING conv_name; /* used as fields initializator */ lex_start(thd, 0, 0); statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_FIELDS], &LOCK_status); bzero((char*) &table_list,sizeof(table_list)); if (thd->copy_db_to(&table_list.db, 0)) break; pend= strend(packet); thd->convert_string(&conv_name, system_charset_info, packet, (uint) (pend-packet), thd->charset()); table_list.alias= table_list.table_name= conv_name.str; packet= pend+1; if (!my_strcasecmp(system_charset_info, table_list.db, INFORMATION_SCHEMA_NAME.str)) { ST_SCHEMA_TABLE *schema_table= find_schema_table(thd, table_list.alias); if (schema_table) table_list.schema_table= schema_table; } thd->query_length= strlen(packet); // for simplicity: don't optimize if (!(thd->query=fields=thd->memdup(packet,thd->query_length+1))) break; mysql_log.write(thd,command,"%s %s",table_list.table_name, fields); if (lower_case_table_names) my_casedn_str(files_charset_info, table_list.table_name); remove_escape(table_list.table_name); // This can't have wildcards if (check_access(thd,SELECT_ACL,table_list.db,&table_list.grant.privilege, 0, 0, test(table_list.schema_table))) break; if (grant_option && check_grant(thd, SELECT_ACL, &table_list, 2, UINT_MAX, 0)) break; /* init structures for VIEW processing */ table_list.select_lex= &(thd->lex->select_lex); mysql_init_query(thd, (uchar*)"", 0); thd->lex-> select_lex.table_list.link_in_list((byte*) &table_list, (byte**) &table_list.next_local); thd->lex->add_to_query_tables(&table_list); /* switch on VIEW optimisation: do not fill temporary tables */ thd->lex->sql_command= SQLCOM_SHOW_FIELDS; mysqld_list_fields(thd,&table_list,fields); thd->lex->unit.cleanup(); thd->cleanup_after_query(); 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; HA_CREATE_INFO create_info; statistic_increment(thd->status_var.com_stat[SQLCOM_CREATE_DB], &LOCK_status); // null test to handle EOM if (!db || !(alias= thd->strdup(db)) || check_db_name(db)) { my_error(ER_WRONG_DB_NAME, MYF(0), db ? db : "NULL"); break; } if (check_access(thd,CREATE_ACL,db,0,1,0,is_schema_db(db))) break; mysql_log.write(thd,command,packet); bzero(&create_info, sizeof(create_info)); mysql_create_db(thd, (lower_case_table_names == 2 ? alias : db), &create_info, 0); break; } case COM_DROP_DB: // QQ: To be removed { statistic_increment(thd->status_var.com_stat[SQLCOM_DROP_DB], &LOCK_status); char *db=thd->strdup(packet); /* null test to handle EOM */ if (!db || check_db_name(db)) { my_error(ER_WRONG_DB_NAME, MYF(0), db ? db : "NULL"); break; } if (check_access(thd,DROP_ACL,db,0,1,0,is_schema_db(db))) break; if (thd->locked_tables || thd->active_transaction()) { my_message(ER_LOCK_OR_ACTIVE_TRANSACTION, ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0)); break; } mysql_log.write(thd,command,db); mysql_rm_db(thd, db, 0, 0); break; } #ifndef EMBEDDED_LIBRARY case COM_BINLOG_DUMP: { ulong pos; ushort flags; uint32 slave_server_id; statistic_increment(thd->status_var.com_other,&LOCK_status); thd->enable_slow_log= opt_log_slow_admin_statements; if (check_global_access(thd, REPL_SLAVE_ACL)) break; /* 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_log.write(thd, command, "Log: '%s' Pos: %ld", packet+10, (long) pos); 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: { bool not_used; statistic_increment(thd->status_var.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, ¬_used)) send_ok(thd); break; } #ifndef EMBEDDED_LIBRARY case COM_SHUTDOWN: { statistic_increment(thd->status_var.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"); 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 kill_mysql(); error=TRUE; break; } #endif case COM_STATISTICS: { mysql_log.write(thd,command,NullS); statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_STATUS], &LOCK_status); #ifndef EMBEDDED_LIBRARY char buff[200]; #else char *buff= thd->net.last_error; #endif STATUS_VAR current_global_status_var; calc_sum_of_all_status(¤t_global_status_var); ulong uptime = (ulong) (thd->start_time - server_start_time); sprintf((char*) buff, "Uptime: %lu Threads: %d Questions: %lu Slow queries: %lu Opens: %lu Flush tables: %lu Open tables: %u Queries per second avg: %.3f", uptime, (int) thread_count, (ulong) thd->query_id, current_global_status_var.long_query_count, current_global_status_var.opened_tables, refresh_version, cached_tables(), (uptime ? (ulonglong2double(thd->query_id) / (double) uptime) : (double) 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(thd->status_var.com_other, &LOCK_status); send_ok(thd); // Tell client we are alive break; case COM_PROCESS_INFO: statistic_increment(thd->status_var.com_stat[SQLCOM_SHOW_PROCESSLIST], &LOCK_status); if (!thd->security_ctx->priv_user[0] && check_global_access(thd, PROCESS_ACL)) break; mysql_log.write(thd,command,NullS); mysqld_list_processes(thd, thd->security_ctx->master_access & PROCESS_ACL ? NullS : thd->security_ctx->priv_user, 0); break; case COM_PROCESS_KILL: { statistic_increment(thd->status_var.com_stat[SQLCOM_KILL], &LOCK_status); ulong id=(ulong) uint4korr(packet); kill_one_thread(thd,id,false); break; } case COM_SET_OPTION: { statistic_increment(thd->status_var.com_stat[SQLCOM_SET_OPTION], &LOCK_status); uint opt_command= uint2korr(packet); switch (opt_command) { case (int) MYSQL_OPTION_MULTI_STATEMENTS_ON: thd->client_capabilities|= CLIENT_MULTI_STATEMENTS; send_eof(thd); break; case (int) MYSQL_OPTION_MULTI_STATEMENTS_OFF: thd->client_capabilities&= ~CLIENT_MULTI_STATEMENTS; send_eof(thd); break; default: my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0)); break; } break; } case COM_DEBUG: statistic_increment(thd->status_var.com_other, &LOCK_status); if (check_global_access(thd, SUPER_ACL)) break; /* purecov: inspected */ mysql_print_status(); 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: my_message(ER_UNKNOWN_COM_ERROR, ER(ER_UNKNOWN_COM_ERROR), MYF(0)); break; } if (thd->lock || thd->open_tables || thd->derived_tables || thd->prelocked_mode) { thd->proc_info="closing tables"; close_thread_tables(thd); /* Free tables */ } /* assume handlers auto-commit (if some doesn't - transaction handling in MySQL should be redesigned to support it; it's a big change, and it's not worth it - better to commit explicitly only writing transactions, read-only ones should better take care of themselves. saves some work in 2pc too) see also sql_base.cc - close_thread_tables() */ bzero(&thd->transaction.stmt, sizeof(thd->transaction.stmt)); if (!thd->active_transaction()) thd->transaction.xid_state.xid.null(); /* report error issued during command execution */ if (thd->killed_errno() && !thd->net.report_error) thd->send_kill_message(); if (thd->net.report_error) net_send_error(thd); log_slow_statement(thd); 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); } void log_slow_statement(THD *thd) { time_t start_of_query; /* The following should never be true with our current code base, but better to keep this here so we don't accidently try to log a statement in a trigger or stored function */ if (unlikely(thd->in_sub_stmt)) return; // Don't set time for sub stmt start_of_query= thd->start_time; thd->end_time(); // Set start time /* Do not log administrative statements unless the appropriate option is set; do not log into slow log if reading from backup. */ if (thd->enable_slow_log && !thd->user_time) { 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) && /* == SQLCOM_END unless this is a SHOW command */ thd->lex->orig_sql_command == SQLCOM_END) { thd->status_var.long_query_count++; mysql_slow_log.write(thd, thd->query, thd->query_length, start_of_query); } } } /* Create a TABLE_LIST object for an INFORMATION_SCHEMA table. SYNOPSIS prepare_schema_table() thd thread handle lex current lex table_ident table alias if it's used schema_table_idx the type of the INFORMATION_SCHEMA table to be created DESCRIPTION This function is used in the parser to convert a SHOW or DESCRIBE table_name command to a SELECT from INFORMATION_SCHEMA. It prepares a SELECT_LEX and a TABLE_LIST object to represent the given command as a SELECT parse tree. NOTES Due to the way this function works with memory and LEX it cannot be used outside the parser (parse tree transformations outside the parser break PS and SP). RETURN VALUE 0 success 1 out of memory or SHOW commands are not allowed in this version of the server. */ int prepare_schema_table(THD *thd, LEX *lex, Table_ident *table_ident, enum enum_schema_tables schema_table_idx) { DBUG_ENTER("prepare_schema_table"); SELECT_LEX *schema_select_lex= NULL; switch (schema_table_idx) { case SCH_SCHEMATA: #if defined(DONT_ALLOW_SHOW_COMMANDS) my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */ DBUG_RETURN(1); #else break; #endif case SCH_TABLE_NAMES: case SCH_TABLES: case SCH_VIEWS: case SCH_TRIGGERS: #ifdef DONT_ALLOW_SHOW_COMMANDS my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */ DBUG_RETURN(1); #else if (lex->select_lex.db == NULL && thd->copy_db_to(&lex->select_lex.db, NULL)) { DBUG_RETURN(1); } schema_select_lex= new SELECT_LEX(); schema_select_lex->db= lex->select_lex.db; schema_select_lex->table_list.first= NULL; remove_escape(schema_select_lex->db); // Fix escaped '_' if (check_db_name(schema_select_lex->db)) { my_error(ER_WRONG_DB_NAME, MYF(0), schema_select_lex->db); DBUG_RETURN(1); } break; #endif case SCH_COLUMNS: case SCH_STATISTICS: #ifdef DONT_ALLOW_SHOW_COMMANDS my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */ DBUG_RETURN(1); #else { DBUG_ASSERT(table_ident); TABLE_LIST **query_tables_last= lex->query_tables_last; schema_select_lex= new SELECT_LEX(); /* 'parent_lex' is used in init_query() so it must be before it. */ schema_select_lex->parent_lex= lex; schema_select_lex->init_query(); if (!schema_select_lex->add_table_to_list(thd, table_ident, 0, 0, TL_READ, (List<String> *) 0, (List<String> *) 0)) DBUG_RETURN(1); lex->query_tables_last= query_tables_last; TABLE_LIST *dst_table= (TABLE_LIST*) schema_select_lex->table_list.first; remove_escape(dst_table->db); // Fix escaped '_' remove_escape(dst_table->table_name); break; } #endif case SCH_OPEN_TABLES: case SCH_VARIABLES: case SCH_STATUS: case SCH_PROCEDURES: case SCH_CHARSETS: case SCH_COLLATIONS: case SCH_COLLATION_CHARACTER_SET_APPLICABILITY: case SCH_USER_PRIVILEGES: case SCH_SCHEMA_PRIVILEGES: case SCH_TABLE_PRIVILEGES: case SCH_COLUMN_PRIVILEGES: case SCH_TABLE_CONSTRAINTS: case SCH_KEY_COLUMN_USAGE: default: break; } SELECT_LEX *select_lex= lex->current_select; if (make_schema_select(thd, select_lex, schema_table_idx)) { DBUG_RETURN(1); } TABLE_LIST *table_list= (TABLE_LIST*) select_lex->table_list.first; table_list->schema_select_lex= schema_select_lex; table_list->schema_table_reformed= 1; statistic_increment(thd->status_var.com_stat[lex->orig_sql_command], &LOCK_status); DBUG_RETURN(0); } /* Read query from packet and store in thd->query Used in COM_QUERY and COM_STMT_PREPARE DESCRIPTION Sets the following THD variables: query query_length RETURN VALUES FALSE ok TRUE error; In this case thd->fatal_error is set */ bool alloc_query(THD *thd, const char *packet, uint 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--; } const 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 TRUE; 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); return FALSE; } static void reset_one_shot_variables(THD *thd) { 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->variables.lc_time_names= &my_locale_en_US; thd->one_shot_set= 0; } /* Execute command saved in thd and lex->sql_command SYNOPSIS mysql_execute_command() thd Thread handle IMPLEMENTATION Before every operation that can request a write lock for a table wait if a global read lock exists. However do not wait if this thread has locked tables already. No new locks can be requested until the other locks are released. The thread that requests the global read lock waits for write locked tables to become unlocked. Note that wait_if_global_read_lock() sets a protection against a new global read lock when it succeeds. This needs to be released by start_waiting_global_read_lock() after the operation. RETURN FALSE OK TRUE Error */ bool mysql_execute_command(THD *thd) { bool res= FALSE; bool need_start_waiting= FALSE; // have protection against global read lock int up_result= 0; LEX *lex= thd->lex; /* first SELECT_LEX (have special meaning for many of non-SELECTcommands) */ SELECT_LEX *select_lex= &lex->select_lex; /* first table of first SELECT_LEX */ TABLE_LIST *first_table= (TABLE_LIST*) select_lex->table_list.first; /* list of all tables in query */ TABLE_LIST *all_tables; /* most outer SELECT_LEX_UNIT of query */ SELECT_LEX_UNIT *unit= &lex->unit; /* Saved variable value */ DBUG_ENTER("mysql_execute_command"); thd->net.no_send_error= 0; /* Remember first generated insert id value of the previous statement. We remember it here at the beginning of the statement, and also in Item_func_last_insert_id::fix_fields() and sys_var_last_insert_id::value_ptr(). Last two places are required because LAST_INSERT_ID() and @@LAST_INSERT_ID may also be used in expression that is not executed with mysql_execute_command(). And we remember it here because some statements read @@LAST_INSERT_ID indirectly, like "SELECT * FROM t1 WHERE id IS NULL", that may replace "id IS NULL" with "id = <LAST_INSERT_ID>". */ thd->current_insert_id= thd->last_insert_id; /* In many cases first table of main SELECT_LEX have special meaning => check that it is first table in global list and relink it first in queries_tables list if it is necessary (we need such relinking only for queries with subqueries in select list, in this case tables of subqueries will go to global list first) all_tables will differ from first_table only if most upper SELECT_LEX do not contain tables. Because of above in place where should be at least one table in most outer SELECT_LEX we have following check: DBUG_ASSERT(first_table == all_tables); DBUG_ASSERT(first_table == all_tables && first_table != 0); */ lex->first_lists_tables_same(); /* should be assigned after making first tables same */ all_tables= lex->query_tables; /* set context for commands which do not use setup_tables */ select_lex-> context.resolve_in_table_list_only((TABLE_LIST*)select_lex-> table_list.first); /* 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. Don't reset warnings when executing a stored routine. */ if ((all_tables || &lex->select_lex != lex->all_selects_list || lex->sroutines.records) && !thd->spcont || lex->time_zone_tables_used) mysql_reset_errors(thd, 0); #ifdef HAVE_REPLICATION if (unlikely(thd->slave_thread)) { if (lex->sql_command == SQLCOM_DROP_TRIGGER) { /* When dropping a trigger, we need to load its table name before checking slave filter rules. */ add_table_for_trigger(thd, thd->lex->spname, 1, &all_tables); if (!all_tables) { /* If table name cannot be loaded, it means the trigger does not exists possibly because CREATE TRIGGER was previously skipped for this trigger according to slave filtering rules. Returning success without producing any errors in this case. */ DBUG_RETURN(0); } // force searching in slave.cc:tables_ok() all_tables->updating= 1; } /* Check if statment should be skipped because of slave filtering rules Exceptions are: - UPDATE MULTI: For this statement, we want to check the filtering rules later in the code - SET: we always execute it (Not that many SET commands exists in the binary log anyway -- only 4.1 masters write SET statements, in 5.0 there are no SET statements in the binary log) - DROP TEMPORARY TABLE IF EXISTS: we always execute it (otherwise we have stale files on slave caused by exclusion of one tmp table). */ if (!(lex->sql_command == SQLCOM_UPDATE_MULTI) && !(lex->sql_command == SQLCOM_SET_OPTION) && !(lex->sql_command == SQLCOM_DROP_TABLE && lex->drop_temporary && lex->drop_if_exists) && all_tables_not_ok(thd, all_tables)) { /* we warn the slave SQL thread */ my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0)); if (thd->one_shot_set) { /* It's ok to check thd->one_shot_set here: The charsets in a MySQL 5.0 slave can change by both a binlogged SET ONE_SHOT statement and the event-internal charset setting, and these two ways to change charsets do not seems to work together. At least there seems to be problems in the rli cache for charsets if we are using ONE_SHOT. Note that this is normally no problem because either the >= 5.0 slave reads a 4.1 binlog (with ONE_SHOT) *or* or 5.0 binlog (without ONE_SHOT) but never both." */ reset_one_shot_variables(thd); } DBUG_RETURN(0); } } else { #endif /* HAVE_REPLICATION */ /* When option readonly is set deny operations which change non-temporary tables. Except for the replication thread and the 'super' users. */ if (opt_readonly && !(thd->security_ctx->master_access & SUPER_ACL) && uc_update_queries[lex->sql_command] && !((lex->sql_command == SQLCOM_CREATE_TABLE) && (lex->create_info.options & HA_LEX_CREATE_TMP_TABLE)) && !((lex->sql_command == SQLCOM_DROP_TABLE) && lex->drop_temporary) && ((lex->sql_command != SQLCOM_UPDATE_MULTI) && some_non_temp_table_to_be_updated(thd, all_tables))) { my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only"); DBUG_RETURN(-1); } #ifdef HAVE_REPLICATION } /* endif unlikely slave */ #endif if(lex->orig_sql_command == SQLCOM_END) statistic_increment(thd->status_var.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= new Item_int((ulonglong)thd->variables.select_limit); } select_result *sel_result=lex->result; if (all_tables) { if (lex->orig_sql_command != SQLCOM_SHOW_STATUS_PROC && lex->orig_sql_command != SQLCOM_SHOW_STATUS_FUNC) res= check_table_access(thd, lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL, all_tables, 0); } else res= check_access(thd, lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL, any_db, 0, 0, 0, 0); if (res) goto error; if (!(res= open_and_lock_tables(thd, all_tables))) { if (lex->describe) { /* We always use select_send for EXPLAIN, even if it's an EXPLAIN for SELECT ... INTO OUTFILE: a user application should be able to prepend EXPLAIN to any query and receive output for it, even if the query itself redirects the output. */ if (!(sel_result= new select_send())) goto error; else thd->send_explain_fields(sel_result); res= mysql_explain_union(thd, &thd->lex->unit, sel_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()); } sel_result->send_eof(); delete sel_result; } else { if (!sel_result && !(sel_result= new select_send())) goto error; query_cache_store_query(thd, all_tables); res= handle_select(thd, lex, sel_result, 0); if (sel_result != lex->result) delete sel_result; } } break; } case SQLCOM_PREPARE: { mysql_sql_stmt_prepare(thd); break; } case SQLCOM_EXECUTE: { mysql_sql_stmt_execute(thd); break; } case SQLCOM_DEALLOCATE_PREPARE: { mysql_sql_stmt_close(thd); break; } case SQLCOM_DO: if (check_table_access(thd, SELECT_ACL, all_tables, 0) || open_and_lock_tables(thd, all_tables)) goto error; res= mysql_do(thd, *lex->insert_list); 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: { Item *it; if (check_global_access(thd, SUPER_ACL)) goto error; /* PURGE MASTER LOGS BEFORE 'data' */ it= (Item *)lex->value_list.head(); if ((!it->fixed && it->fix_fields(lex->thd, &it)) || it->check_cols(1)) { my_error(ER_WRONG_ARGUMENTS, MYF(0), "PURGE LOGS BEFORE"); goto error; } it= new Item_func_unix_timestamp(it); /* it is OK only emulate fix_fieds, because we need only value of constant */ it->quick_fix_field(); res = purge_master_logs_before_date(thd, (ulong)it->val_int()); 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 my_error(ER_NOT_SUPPORTED_YET, MYF(0), "SHOW NEW MASTER"); goto error; #else res = show_new_master(thd); break; #endif } #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 = mysql_show_binlog_events(thd); break; } #endif case SQLCOM_BACKUP_TABLE: { DBUG_ASSERT(first_table == all_tables && first_table != 0); if (check_db_used(thd, all_tables) || check_table_access(thd, SELECT_ACL, all_tables, 0) || check_global_access(thd, FILE_ACL)) goto error; /* purecov: inspected */ thd->enable_slow_log= opt_log_slow_admin_statements; res = mysql_backup_table(thd, first_table); select_lex->table_list.first= (byte*) first_table; lex->query_tables=all_tables; break; } case SQLCOM_RESTORE_TABLE: { DBUG_ASSERT(first_table == all_tables && first_table != 0); if (check_db_used(thd, all_tables) || check_table_access(thd, INSERT_ACL, all_tables, 0) || check_global_access(thd, FILE_ACL)) goto error; /* purecov: inspected */ thd->enable_slow_log= opt_log_slow_admin_statements; res = mysql_restore_table(thd, first_table); select_lex->table_list.first= (byte*) first_table; lex->query_tables=all_tables; break; } case SQLCOM_ASSIGN_TO_KEYCACHE: { DBUG_ASSERT(first_table == all_tables && first_table != 0); if (check_db_used(thd, all_tables) || check_access(thd, INDEX_ACL, first_table->db, &first_table->grant.privilege, 0, 0, test(first_table->schema_table))) goto error; res= mysql_assign_to_keycache(thd, first_table, &lex->ident); break; } case SQLCOM_PRELOAD_KEYS: { DBUG_ASSERT(first_table == all_tables && first_table != 0); if (check_db_used(thd, all_tables) || check_access(thd, INDEX_ACL, first_table->db, &first_table->grant.privilege, 0, 0, test(first_table->schema_table))) goto error; res = mysql_preload_keys(thd, first_table); 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)) goto error; else res = load_master_data(thd); break; #endif /* HAVE_REPLICATION */ #ifdef HAVE_NDBCLUSTER_DB case SQLCOM_SHOW_NDBCLUSTER_STATUS: { res = ndbcluster_show_status(thd); break; } #endif #ifdef HAVE_INNOBASE_DB case SQLCOM_SHOW_INNODB_STATUS: { if (check_global_access(thd, SUPER_ACL)) goto error; res = innodb_show_status(thd); break; } case SQLCOM_SHOW_MUTEX_STATUS: { if (check_global_access(thd, SUPER_ACL)) goto error; res = innodb_mutex_show_status(thd); break; } #endif #ifdef HAVE_REPLICATION case SQLCOM_LOAD_MASTER_TABLE: { DBUG_ASSERT(first_table == all_tables && first_table != 0); DBUG_ASSERT(first_table->db); /* Must be set in the parser */ if (check_access(thd, CREATE_ACL, first_table->db, &first_table->grant.privilege, 0, 0, test(first_table->schema_table))) goto error; /* purecov: inspected */ if (grant_option) { /* Check that the first table has CREATE privilege */ if (check_grant(thd, CREATE_ACL, all_tables, 0, 1, 0)) goto error; } if (strlen(first_table->table_name) > NAME_LEN) { my_error(ER_WRONG_TABLE_NAME, MYF(0), first_table->table_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, first_table->db, first_table->table_name, active_mi, 0, 0)) { send_ok(thd); } pthread_mutex_unlock(&LOCK_active_mi); break; } #endif /* HAVE_REPLICATION */ case SQLCOM_CREATE_TABLE: { /* If CREATE TABLE of non-temporary table, do implicit commit */ if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE)) { if (end_active_trans(thd)) { res= -1; break; } } else { /* So that CREATE TEMPORARY TABLE gets to binlog at commit/rollback */ thd->no_trans_update.all= TRUE; } DBUG_ASSERT(first_table == all_tables && first_table != 0); bool link_to_local; // Skip first table, which is the table we are creating TABLE_LIST *create_table= lex->unlink_first_table(&link_to_local); TABLE_LIST *select_tables= lex->query_tables; /* Code below (especially in mysql_create_table() and select_create methods) may modify HA_CREATE_INFO structure in LEX, so we have to use a copy of this structure to make execution prepared statement- safe. A shallow copy is enough as this code won't modify any memory referenced from this structure. */ HA_CREATE_INFO create_info(lex->create_info); Alter_info alter_info(lex->alter_info, thd->mem_root); if (thd->is_fatal_error) { /* out of memory when creating a copy of alter_info */ res= 1; goto end_with_restore_list; } if ((res= create_table_precheck(thd, select_tables, create_table))) goto end_with_restore_list; create_info.alias= create_table->alias; #ifndef HAVE_READLINK if (create_info.data_file_name) push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0, "DATA DIRECTORY option ignored"); if (create_info.index_file_name) push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0, "INDEX DIRECTORY option ignored"); create_info.data_file_name= create_info.index_file_name= NULL; #else /* Fix names if symlinked tables */ if (append_file_to_dir(thd, &create_info.data_file_name, create_table->table_name) || append_file_to_dir(thd, &create_info.index_file_name, create_table->table_name)) goto end_with_restore_list; #endif /* If we are using SET CHARSET without DEFAULT, add an implicit DEFAULT to not confuse old users. (This may change). */ if ((create_info.used_fields & (HA_CREATE_USED_DEFAULT_CHARSET | HA_CREATE_USED_CHARSET)) == HA_CREATE_USED_CHARSET) { create_info.used_fields&= ~HA_CREATE_USED_CHARSET; create_info.used_fields|= HA_CREATE_USED_DEFAULT_CHARSET; create_info.default_table_charset= create_info.table_charset; create_info.table_charset= 0; } /* The create-select command will open and read-lock the select table and then create, open and write-lock the new table. If a global read lock steps in, we get a deadlock. The write lock waits for the global read lock, while the global read lock waits for the select table to be closed. So we wait until the global readlock is gone before starting both steps. Note that wait_if_global_read_lock() sets a protection against a new global read lock when it succeeds. This needs to be released by start_waiting_global_read_lock(). We protect the normal CREATE TABLE in the same way. That way we avoid that a new table is created during a gobal read lock. */ if (!thd->locked_tables && !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1))) { res= 1; goto end_with_restore_list; } if (select_lex->item_list.elements) // With select { select_result *sel_result; select_lex->options|= SELECT_NO_UNLOCK; unit->set_limit(select_lex); if (!(res= open_and_lock_tables(thd, select_tables))) { /* Is table which we are changing used somewhere in other parts of query */ if (!(create_info.options & HA_LEX_CREATE_TMP_TABLE)) { TABLE_LIST *duplicate; if ((duplicate= unique_table(thd, create_table, select_tables, 0))) { update_non_unique_table_error(create_table, "CREATE", duplicate); res= 1; goto end_with_restore_list; } } /* If we create merge table, we have to test tables in merge, too */ if (create_info.used_fields & HA_CREATE_USED_UNION) { TABLE_LIST *tab; for (tab= (TABLE_LIST*) create_info.merge_list.first; tab; tab= tab->next_local) { TABLE_LIST *duplicate; if ((duplicate= unique_table(thd, tab, select_tables, 0))) { update_non_unique_table_error(tab, "CREATE", duplicate); res= 1; goto end_with_restore_list; } } } /* select_create is currently not re-execution friendly and needs to be created for every execution of a PS/SP. */ if ((sel_result= new select_create(create_table, &create_info, &alter_info, select_lex->item_list, lex->duplicates, lex->ignore))) { /* CREATE from SELECT give its SELECT_LEX for SELECT, and item_list belong to SELECT */ res= handle_select(thd, lex, sel_result, 0); delete sel_result; } } } else { /* regular create */ if (lex->name) res= mysql_create_like_table(thd, create_table, &create_info, (Table_ident *)lex->name); else { res= mysql_create_table(thd, create_table->db, create_table->table_name, &create_info, &alter_info, 0, 0); } if (!res) send_ok(thd); } /* put tables back for PS rexecuting */ end_with_restore_list: lex->link_first_table_back(create_table, link_to_local); break; } case SQLCOM_CREATE_INDEX: /* Fall through */ case SQLCOM_DROP_INDEX: /* CREATE INDEX and DROP INDEX are implemented by calling ALTER TABLE with 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. */ { Alter_info alter_info(lex->alter_info, thd->mem_root); HA_CREATE_INFO create_info; if (thd->is_fatal_error) /* out of memory creating a copy of alter_info*/ goto error; DBUG_ASSERT(first_table == all_tables && first_table != 0); if (check_one_table_access(thd, INDEX_ACL, first_table)) goto error; /* purecov: inspected */ if (end_active_trans(thd)) goto error; /* Currently CREATE INDEX or DROP INDEX cause a full table rebuild and thus classify as slow administrative statements just like ALTER TABLE. */ thd->enable_slow_log= opt_log_slow_admin_statements; bzero((char*) &create_info, sizeof(create_info)); create_info.db_type= DB_TYPE_DEFAULT; create_info.row_type= ROW_TYPE_NOT_USED; create_info.default_table_charset= thd->variables.collation_database; res= mysql_alter_table(thd, first_table->db, first_table->table_name, &create_info, first_table, &alter_info, 0, (ORDER*) 0, 0); 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() || thd->global_read_lock) { my_message(ER_LOCK_OR_ACTIVE_TRANSACTION, ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0)); goto error; } { 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: DBUG_ASSERT(first_table == all_tables && first_table != 0); { ulong priv=0; /* Code in mysql_alter_table() may modify its HA_CREATE_INFO argument, so we have to use a copy of this structure to make execution prepared statement- safe. A shallow copy is enough as no memory referenced from this structure will be modified. */ HA_CREATE_INFO create_info(lex->create_info); Alter_info alter_info(lex->alter_info, thd->mem_root); if (thd->is_fatal_error) /* out of memory creating a copy of alter_info */ goto error; if (lex->name && (!lex->name[0] || strlen(lex->name) > NAME_LEN)) { my_error(ER_WRONG_TABLE_NAME, MYF(0), lex->name); goto error; } /* Must be set in the parser */ DBUG_ASSERT(select_lex->db); if (check_access(thd, ALTER_ACL, first_table->db, &first_table->grant.privilege, 0, 0, test(first_table->schema_table)) || check_access(thd,INSERT_ACL | CREATE_ACL,select_lex->db,&priv,0,0, is_schema_db(select_lex->db))|| check_merge_table_access(thd, first_table->db, (TABLE_LIST *) create_info.merge_list.first)) goto error; /* purecov: inspected */ if (grant_option) { if (check_grant(thd, ALTER_ACL, all_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.table_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 */ if (create_info.data_file_name) push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0, "DATA DIRECTORY option ignored"); if (create_info.index_file_name) push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, 0, "INDEX DIRECTORY option ignored"); create_info.data_file_name= create_info.index_file_name= NULL; /* ALTER TABLE ends previous transaction */ if (end_active_trans(thd)) goto error; else { if (!thd->locked_tables && !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1))) { res= 1; break; } thd->enable_slow_log= opt_log_slow_admin_statements; res= mysql_alter_table(thd, select_lex->db, lex->name, &create_info, first_table, &alter_info, select_lex->order_list.elements, (ORDER *) select_lex->order_list.first, lex->ignore); } break; } case SQLCOM_RENAME_TABLE: { DBUG_ASSERT(first_table == all_tables && first_table != 0); TABLE_LIST *table; if (check_db_used(thd, all_tables)) goto error; for (table= first_table; table; table= table->next_local->next_local) { if (check_access(thd, ALTER_ACL | DROP_ACL, table->db, &table->grant.privilege,0,0, test(table->schema_table)) || check_access(thd, INSERT_ACL | CREATE_ACL, table->next_local->db, &table->next_local->grant.privilege, 0, 0, test(table->next_local->schema_table))) 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_local[0]; if (check_grant(thd, ALTER_ACL | DROP_ACL, &old_list, 0, 1, 0) || (!test_all_bits(table->next_local->grant.privilege, INSERT_ACL | CREATE_ACL) && check_grant(thd, INSERT_ACL | CREATE_ACL, &new_list, 0, 1, 0))) goto error; } } query_cache_invalidate3(thd, first_table, 0); if (end_active_trans(thd) || mysql_rename_tables(thd, first_table)) goto error; break; } #ifndef EMBEDDED_LIBRARY case SQLCOM_SHOW_BINLOGS: #ifdef DONT_ALLOW_SHOW_COMMANDS my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */ goto error; #else { if (check_global_access(thd, SUPER_ACL)) goto error; res = show_binlogs(thd); break; } #endif #endif /* EMBEDDED_LIBRARY */ case SQLCOM_SHOW_CREATE: DBUG_ASSERT(first_table == all_tables && first_table != 0); #ifdef DONT_ALLOW_SHOW_COMMANDS my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */ goto error; #else { /* Ignore temporary tables if this is "SHOW CREATE VIEW" */ if (lex->only_view) first_table->skip_temporary= 1; if (check_db_used(thd, all_tables) || check_access(thd, SELECT_ACL | EXTRA_ACL, first_table->db, &first_table->grant.privilege, 0, 0, test(first_table->schema_table))) goto error; if (grant_option && check_grant(thd, SELECT_ACL, all_tables, 2, UINT_MAX, 0)) goto error; res= mysqld_show_create(thd, first_table); break; } #endif case SQLCOM_CHECKSUM: { DBUG_ASSERT(first_table == all_tables && first_table != 0); if (check_db_used(thd, all_tables) || check_table_access(thd, SELECT_ACL | EXTRA_ACL, all_tables, 0)) goto error; /* purecov: inspected */ res = mysql_checksum_table(thd, first_table, &lex->check_opt); break; } case SQLCOM_REPAIR: { DBUG_ASSERT(first_table == all_tables && first_table != 0); if (check_db_used(thd, all_tables) || check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0)) goto error; /* purecov: inspected */ thd->enable_slow_log= opt_log_slow_admin_statements; res= mysql_repair_table(thd, first_table, &lex->check_opt); /* ! we write after unlocking the table */ if (!res && !lex->no_write_to_binlog) { /* Presumably, REPAIR and binlog writing doesn't require synchronization */ if (mysql_bin_log.is_open()) { thd->clear_error(); // No binlog error generated Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE); mysql_bin_log.write(&qinfo); } } select_lex->table_list.first= (byte*) first_table; lex->query_tables=all_tables; break; } case SQLCOM_CHECK: { DBUG_ASSERT(first_table == all_tables && first_table != 0); if (check_db_used(thd, all_tables) || check_table_access(thd, SELECT_ACL | EXTRA_ACL , all_tables, 0)) goto error; /* purecov: inspected */ thd->enable_slow_log= opt_log_slow_admin_statements; res = mysql_check_table(thd, first_table, &lex->check_opt); select_lex->table_list.first= (byte*) first_table; lex->query_tables=all_tables; break; } case SQLCOM_ANALYZE: { DBUG_ASSERT(first_table == all_tables && first_table != 0); if (check_db_used(thd, all_tables) || check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0)) goto error; /* purecov: inspected */ thd->enable_slow_log= opt_log_slow_admin_statements; res = mysql_analyze_table(thd, first_table, &lex->check_opt); /* ! we write after unlocking the table */ if (!res && !lex->no_write_to_binlog) { /* Presumably, ANALYZE and binlog writing doesn't require synchronization */ if (mysql_bin_log.is_open()) { thd->clear_error(); // No binlog error generated Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE); mysql_bin_log.write(&qinfo); } } select_lex->table_list.first= (byte*) first_table; lex->query_tables=all_tables; break; } case SQLCOM_OPTIMIZE: { DBUG_ASSERT(first_table == all_tables && first_table != 0); if (check_db_used(thd, all_tables) || check_table_access(thd, SELECT_ACL | INSERT_ACL, all_tables, 0)) goto error; /* purecov: inspected */ thd->enable_slow_log= opt_log_slow_admin_statements; res= (specialflag & (SPECIAL_SAFE_MODE | SPECIAL_NO_NEW_FUNC)) ? mysql_recreate_table(thd, first_table) : mysql_optimize_table(thd, first_table, &lex->check_opt); /* ! we write after unlocking the table */ if (!res && !lex->no_write_to_binlog) { /* Presumably, OPTIMIZE and binlog writing doesn't require synchronization */ if (mysql_bin_log.is_open()) { thd->clear_error(); // No binlog error generated Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE); mysql_bin_log.write(&qinfo); } } select_lex->table_list.first= (byte*) first_table; lex->query_tables=all_tables; break; } case SQLCOM_UPDATE: DBUG_ASSERT(first_table == all_tables && first_table != 0); if (update_precheck(thd, all_tables)) break; DBUG_ASSERT(select_lex->offset_limit == 0); unit->set_limit(select_lex); res= (up_result= mysql_update(thd, all_tables, select_lex->item_list, lex->value_list, select_lex->where, select_lex->order_list.elements, (ORDER *) select_lex->order_list.first, unit->select_limit_cnt, lex->duplicates, lex->ignore)); /* mysql_update return 2 if we need to switch to multi-update */ if (up_result != 2) break; /* Fall through */ case SQLCOM_UPDATE_MULTI: { DBUG_ASSERT(first_table == all_tables && first_table != 0); /* if we switched from normal update, rights are checked */ if (up_result != 2) { if ((res= multi_update_precheck(thd, all_tables))) break; } else res= 0; res= mysql_multi_update_prepare(thd); #ifdef HAVE_REPLICATION /* Check slave filtering rules */ if (unlikely(thd->slave_thread)) { if (all_tables_not_ok(thd, all_tables)) { if (res!= 0) { res= 0; /* don't care of prev failure */ thd->clear_error(); /* filters are of highest prior */ } /* we warn the slave SQL thread */ my_error(ER_SLAVE_IGNORED_TABLE, MYF(0)); break; } if (res) break; } else { #endif /* HAVE_REPLICATION */ if (res) break; if (opt_readonly && !(thd->security_ctx->master_access & SUPER_ACL) && some_non_temp_table_to_be_updated(thd, all_tables)) { my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--read-only"); break; } #ifdef HAVE_REPLICATION } /* unlikely */ #endif res= mysql_multi_update(thd, all_tables, &select_lex->item_list, &lex->value_list, select_lex->where, select_lex->options, lex->duplicates, lex->ignore, unit, select_lex); break; } case SQLCOM_REPLACE: case SQLCOM_INSERT: { DBUG_ASSERT(first_table == all_tables && first_table != 0); if ((res= insert_precheck(thd, all_tables))) break; if (!thd->locked_tables && !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1))) { res= 1; break; } res= mysql_insert(thd, all_tables, lex->field_list, lex->many_values, lex->update_list, lex->value_list, lex->duplicates, lex->ignore); /* If we have inserted into a VIEW, and the base table has AUTO_INCREMENT column, but this column is not accessible through a view, then we should restore LAST_INSERT_ID to the value it had before the statement. */ if (first_table->view && !first_table->contain_auto_increment) thd->last_insert_id= thd->current_insert_id; break; } case SQLCOM_REPLACE_SELECT: case SQLCOM_INSERT_SELECT: { select_result *sel_result; DBUG_ASSERT(first_table == all_tables && first_table != 0); if ((res= insert_precheck(thd, all_tables))) break; /* Fix lock for first table */ if (first_table->lock_type == TL_WRITE_DELAYED) first_table->lock_type= TL_WRITE; /* Don't unlock tables until command is written to binary log */ select_lex->options|= SELECT_NO_UNLOCK; unit->set_limit(select_lex); if (! thd->locked_tables && ! (need_start_waiting= ! wait_if_global_read_lock(thd, 0, 1))) { res= 1; break; } if (!(res= open_and_lock_tables(thd, all_tables))) { /* Skip first table, which is the table we are inserting in */ TABLE_LIST *second_table= first_table->next_local; select_lex->table_list.first= (byte*) second_table; select_lex->context.table_list= select_lex->context.first_name_resolution_table= second_table; res= mysql_insert_select_prepare(thd); if (!res && (sel_result= new select_insert(first_table, first_table->table, &lex->field_list, &lex->update_list, &lex->value_list, lex->duplicates, lex->ignore))) { res= handle_select(thd, lex, sel_result, OPTION_SETUP_TABLES_DONE); /* Invalidate the table in the query cache if something changed after unlocking when changes become visible. TODO: this is workaround. right way will be move invalidating in the unlock procedure. */ if (first_table->lock_type == TL_WRITE_CONCURRENT_INSERT && thd->lock) { /* INSERT ... SELECT should invalidate only the very first table */ TABLE_LIST *save_table= first_table->next_local; first_table->next_local= 0; mysql_unlock_tables(thd, thd->lock); query_cache_invalidate3(thd, first_table, 1); first_table->next_local= save_table; thd->lock=0; } delete sel_result; } /* revert changes for SP */ select_lex->table_list.first= (byte*) first_table; } /* If we have inserted into a VIEW, and the base table has AUTO_INCREMENT column, but this column is not accessible through a view, then we should restore LAST_INSERT_ID to the value it had before the statement. */ if (first_table->view && !first_table->contain_auto_increment) thd->last_insert_id= thd->current_insert_id; break; } case SQLCOM_TRUNCATE: if (end_active_trans(thd)) { res= -1; break; } DBUG_ASSERT(first_table == all_tables && first_table != 0); if (check_one_table_access(thd, DELETE_ACL, all_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()) { my_message(ER_LOCK_OR_ACTIVE_TRANSACTION, ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0)); goto error; } res= mysql_truncate(thd, first_table, 0); break; case SQLCOM_DELETE: { DBUG_ASSERT(first_table == all_tables && first_table != 0); if ((res= delete_precheck(thd, all_tables))) break; DBUG_ASSERT(select_lex->offset_limit == 0); unit->set_limit(select_lex); if (!thd->locked_tables && !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1))) { res= 1; break; } res = mysql_delete(thd, all_tables, select_lex->where, &select_lex->order_list, unit->select_limit_cnt, select_lex->options, FALSE); break; } case SQLCOM_DELETE_MULTI: { DBUG_ASSERT(first_table == all_tables && first_table != 0); TABLE_LIST *aux_tables= (TABLE_LIST *)thd->lex->auxiliary_table_list.first; multi_delete *del_result; if (!thd->locked_tables && !(need_start_waiting= !wait_if_global_read_lock(thd, 0, 1))) { res= 1; break; } if ((res= multi_delete_precheck(thd, all_tables))) 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())) goto error; thd->proc_info="init"; if ((res= open_and_lock_tables(thd, all_tables))) break; if ((res= mysql_multi_delete_prepare(thd))) goto error; if (!thd->is_fatal_error && (del_result= new multi_delete(aux_tables, lex->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 | OPTION_SETUP_TABLES_DONE, del_result, unit, select_lex); delete del_result; } else res= TRUE; // Error break; } case SQLCOM_DROP_TABLE: { DBUG_ASSERT(first_table == all_tables && first_table != 0); if (!lex->drop_temporary) { if (check_table_access(thd, DROP_ACL, all_tables, 0)) goto error; /* purecov: inspected */ if (end_active_trans(thd)) goto error; } 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; /* So that DROP TEMPORARY TABLE gets to binlog at commit/rollback */ thd->no_trans_update.all= TRUE; } /* DDL and binlog write order protected by LOCK_open */ res= mysql_rm_table(thd, first_table, lex->drop_if_exists, lex->drop_temporary); } break; case SQLCOM_SHOW_PROCESSLIST: if (!thd->security_ctx->priv_user[0] && check_global_access(thd,PROCESS_ACL)) break; mysqld_list_processes(thd, (thd->security_ctx->master_access & PROCESS_ACL ? NullS : thd->security_ctx->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_LOGS: #ifdef DONT_ALLOW_SHOW_COMMANDS my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); /* purecov: inspected */ goto error; #else { if (grant_option && check_access(thd, FILE_ACL, any_db,0,0,0,0)) goto error; res= mysqld_show_logs(thd); break; } #endif case SQLCOM_CHANGE_DB: { LEX_STRING db_str= { (char *) select_lex->db, strlen(select_lex->db) }; if (!mysql_change_db(thd, &db_str, FALSE)) send_ok(thd); break; } case SQLCOM_LOAD: { DBUG_ASSERT(first_table == all_tables && first_table != 0); uint privilege= (lex->duplicates == DUP_REPLACE ? INSERT_ACL | DELETE_ACL : INSERT_ACL) | (lex->local_file ? 0 : FILE_ACL); if (lex->local_file) { if (!(thd->client_capabilities & CLIENT_LOCAL_FILES) || !opt_local_infile) { my_message(ER_NOT_ALLOWED_COMMAND, ER(ER_NOT_ALLOWED_COMMAND), MYF(0)); goto error; } } if (check_one_table_access(thd, privilege, all_tables)) goto error; res= mysql_load(thd, lex->exchange, first_table, lex->field_list, lex->update_list, lex->value_list, lex->duplicates, lex->ignore, (bool) lex->local_file); break; } case SQLCOM_SET_OPTION: { List<set_var_base> *lex_var_list= &lex->var_list; if ((check_table_access(thd, SELECT_ACL, all_tables, 0) || open_and_lock_tables(thd, all_tables))) goto error; if (lex->one_shot_set && not_all_support_one_shot(lex_var_list)) { my_error(ER_RESERVED_SYNTAX, MYF(0), "SET ONE_SHOT"); goto error; } 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); } break; } case SQLCOM_UNLOCK_TABLES: /* It is critical for mysqldump --single-transaction --master-data that UNLOCK TABLES does not implicitely commit a connection which has only done FLUSH TABLES WITH READ LOCK + BEGIN. If this assumption becomes false, mysqldump will not work. */ 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, all_tables) || end_active_trans(thd)) goto error; if (check_table_access(thd, LOCK_TABLES_ACL | SELECT_ACL, all_tables, 0)) goto error; thd->in_lock_tables=1; thd->options|= OPTION_TABLE_LOCK; if (!(res= simple_open_n_lock_tables(thd, all_tables))) { #ifdef HAVE_QUERY_CACHE if (thd->variables.query_cache_wlock_invalidate) query_cache.invalidate_locked_for_write(first_table); #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: { /* As mysql_create_db() may modify HA_CREATE_INFO structure passed to it, we need to use a copy of LEX::create_info to make execution prepared statement- safe. */ HA_CREATE_INFO create_info(lex->create_info); if (end_active_trans(thd)) { res= -1; break; } char *alias; if (!(alias=thd->strdup(lex->name)) || check_db_name(lex->name)) { my_error(ER_WRONG_DB_NAME, MYF(0), 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_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0)); break; } #endif if (check_access(thd,CREATE_ACL,lex->name,0,1,0,is_schema_db(lex->name))) break; res= mysql_create_db(thd,(lower_case_table_names == 2 ? alias : lex->name), &create_info, 0); break; } case SQLCOM_DROP_DB: { if (end_active_trans(thd)) { res= -1; break; } if (check_db_name(lex->name)) { my_error(ER_WRONG_DB_NAME, MYF(0), 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_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0)); break; } #endif if (check_access(thd,DROP_ACL,lex->name,0,1,0,is_schema_db(lex->name))) break; if (thd->locked_tables || thd->active_transaction()) { my_message(ER_LOCK_OR_ACTIVE_TRANSACTION, ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0)); goto error; } res= mysql_rm_db(thd, lex->name, lex->drop_if_exists, 0); break; } case SQLCOM_ALTER_DB: { char *db= lex->name; DBUG_ASSERT(db); /* Must be set in the parser */ if (!strip_sp(db) || check_db_name(db)) { my_error(ER_WRONG_DB_NAME, MYF(0), 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(db, replicate_do_db, replicate_ignore_db) || !db_ok_with_wild_table(db))) { my_message(ER_SLAVE_IGNORED_TABLE, ER(ER_SLAVE_IGNORED_TABLE), MYF(0)); break; } #endif if (check_access(thd, ALTER_ACL, db, 0, 1, 0, is_schema_db(db))) break; if (thd->locked_tables || thd->active_transaction()) { my_message(ER_LOCK_OR_ACTIVE_TRANSACTION, ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0)); goto error; } res= mysql_alter_db(thd, db, &lex->create_info); break; } case SQLCOM_SHOW_CREATE_DB: { if (!strip_sp(lex->name) || check_db_name(lex->name)) { my_error(ER_WRONG_DB_NAME, MYF(0), lex->name); break; } if (check_access(thd,SELECT_ACL,lex->name,0,1,0,is_schema_db(lex->name))) break; res=mysqld_show_create_db(thd,lex->name,&lex->create_info); break; } case SQLCOM_CREATE_FUNCTION: // UDF function { if (check_access(thd,INSERT_ACL,"mysql",0,1,0,0)) break; #ifdef HAVE_DLOPEN if (sp_find_routine(thd, TYPE_ENUM_FUNCTION, lex->spname, &thd->sp_func_cache, FALSE)) { my_error(ER_UDF_EXISTS, MYF(0), lex->spname->m_name.str); goto error; } if (!(res = mysql_create_function(thd, &lex->udf))) send_ok(thd); #else my_error(ER_CANT_OPEN_LIBRARY, MYF(0), lex->udf.dl, 0, "feature disabled"); res= TRUE; #endif break; } #ifndef NO_EMBEDDED_ACCESS_CHECKS case SQLCOM_CREATE_USER: { if (check_access(thd, INSERT_ACL, "mysql", 0, 1, 1, 0) && check_global_access(thd,CREATE_USER_ACL)) break; if (end_active_trans(thd)) goto error; /* Conditionally writes to binlog */ if (!(res= mysql_create_user(thd, lex->users_list))) send_ok(thd); break; } case SQLCOM_DROP_USER: { if (check_access(thd, DELETE_ACL, "mysql", 0, 1, 1, 0) && check_global_access(thd,CREATE_USER_ACL)) break; if (end_active_trans(thd)) goto error; /* Conditionally writes to binlog */ if (!(res= mysql_drop_user(thd, lex->users_list))) send_ok(thd); break; } case SQLCOM_RENAME_USER: { if (check_access(thd, UPDATE_ACL, "mysql", 0, 1, 1, 0) && check_global_access(thd,CREATE_USER_ACL)) break; if (end_active_trans(thd)) goto error; /* Conditionally writes to binlog */ if (!(res= mysql_rename_user(thd, lex->users_list))) send_ok(thd); break; } case SQLCOM_REVOKE_ALL: { if (check_access(thd, UPDATE_ACL, "mysql", 0, 1, 1, 0) && check_global_access(thd,CREATE_USER_ACL)) break; /* Conditionally writes to binlog */ if (!(res = mysql_revoke_all(thd, lex->users_list))) send_ok(thd); break; } case SQLCOM_REVOKE: case SQLCOM_GRANT: { if (check_access(thd, lex->grant | lex->grant_tot_col | GRANT_ACL, first_table ? first_table->db : select_lex->db, first_table ? &first_table->grant.privilege : 0, first_table ? 0 : 1, 0, first_table ? (bool) first_table->schema_table : select_lex->db ? is_schema_db(select_lex->db) : 0)) goto error; if (thd->security_ctx->user) // If not replication { LEX_USER *user, *tmp_user; List_iterator <LEX_USER> user_list(lex->users_list); while ((tmp_user= user_list++)) { if (!(user= get_current_user(thd, tmp_user))) goto error; if (specialflag & SPECIAL_NO_RESOLVE && 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); // Are we trying to change a password of another user DBUG_ASSERT(user->host.str != 0); if (strcmp(thd->security_ctx->user, user->user.str) || my_strcasecmp(system_charset_info, user->host.str, thd->security_ctx->host_or_ip)) { // TODO: use check_change_password() if (is_acl_user(user->host.str, user->user.str) && user->password.str && check_access(thd, UPDATE_ACL,"mysql",0,1,1,0)) { my_message(ER_PASSWORD_NOT_ALLOWED, ER(ER_PASSWORD_NOT_ALLOWED), MYF(0)); goto error; } } } } if (first_table) { if (lex->type == TYPE_ENUM_PROCEDURE || lex->type == TYPE_ENUM_FUNCTION) { uint grants= lex->all_privileges ? (PROC_ACLS & ~GRANT_ACL) | (lex->grant & GRANT_ACL) : lex->grant; if (grant_option && check_grant_routine(thd, grants | GRANT_ACL, all_tables, lex->type == TYPE_ENUM_PROCEDURE, 0)) goto error; /* Conditionally writes to binlog */ res= mysql_routine_grant(thd, all_tables, lex->type == TYPE_ENUM_PROCEDURE, lex->users_list, grants, lex->sql_command == SQLCOM_REVOKE, 0); } else { if (grant_option && check_grant(thd, (lex->grant | lex->grant_tot_col | GRANT_ACL), all_tables, 0, UINT_MAX, 0)) goto error; /* Conditionally writes to binlog */ res= mysql_table_grant(thd, all_tables, lex->users_list, lex->columns, lex->grant, lex->sql_command == SQLCOM_REVOKE); } } else { if (lex->columns.elements || lex->type) { my_message(ER_ILLEGAL_GRANT_FOR_TABLE, ER(ER_ILLEGAL_GRANT_FOR_TABLE), MYF(0)); goto error; } else /* Conditionally writes to binlog */ res = mysql_grant(thd, select_lex->db, lex->users_list, lex->grant, lex->sql_command == SQLCOM_REVOKE); if (!res) { if (lex->sql_command == SQLCOM_GRANT) { List_iterator <LEX_USER> str_list(lex->users_list); LEX_USER *user, *tmp_user; while ((tmp_user=str_list++)) { if (!(user= get_current_user(thd, tmp_user))) goto error; reset_mqh(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: { bool write_to_binlog; if (check_global_access(thd,RELOAD_ACL)) goto error; /* reload_acl_and_cache() will tell us if we are allowed to write to the binlog or not. */ if (!reload_acl_and_cache(thd, lex->type, first_table, &write_to_binlog)) { /* We WANT to write and we CAN write. ! we write after unlocking the table. */ /* Presumably, RESET and binlog writing doesn't require synchronization */ if (!lex->no_write_to_binlog && write_to_binlog) { if (mysql_bin_log.is_open()) { Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE); mysql_bin_log.write(&qinfo); } } send_ok(thd); } break; } case SQLCOM_KILL: { Item *it= (Item *)lex->value_list.head(); if ((!it->fixed && it->fix_fields(lex->thd, &it)) || it->check_cols(1)) { my_message(ER_SET_CONSTANTS_ONLY, ER(ER_SET_CONSTANTS_ONLY), MYF(0)); goto error; } kill_one_thread(thd, (ulong)it->val_int(), lex->type & ONLY_KILL_QUERY); break; } #ifndef NO_EMBEDDED_ACCESS_CHECKS case SQLCOM_SHOW_GRANTS: { LEX_USER *grant_user= get_current_user(thd, lex->grant_user); if (!grant_user) goto error; if ((thd->security_ctx->priv_user && !strcmp(thd->security_ctx->priv_user, grant_user->user.str)) || !check_access(thd, SELECT_ACL, "mysql",0,1,0,0)) { res = mysql_show_grants(thd, grant_user); } break; } #endif case SQLCOM_HA_OPEN: DBUG_ASSERT(first_table == all_tables && first_table != 0); if (check_db_used(thd, all_tables) || check_table_access(thd, SELECT_ACL, all_tables, 0)) goto error; res= mysql_ha_open(thd, first_table, 0); break; case SQLCOM_HA_CLOSE: DBUG_ASSERT(first_table == all_tables && first_table != 0); if (check_db_used(thd, all_tables)) goto error; res= mysql_ha_close(thd, first_table); break; case SQLCOM_HA_READ: DBUG_ASSERT(first_table == all_tables && first_table != 0); /* 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, all_tables)) goto error; unit->set_limit(select_lex); res= mysql_ha_read(thd, first_table, lex->ha_read_mode, lex->ident.str, lex->insert_list, lex->ha_rkey_mode, select_lex->where, unit->select_limit_cnt, unit->offset_limit_cnt); break; case SQLCOM_BEGIN: if (thd->transaction.xid_state.xa_state != XA_NOTR) { my_error(ER_XAER_RMFAIL, MYF(0), xa_state_names[thd->transaction.xid_state.xa_state]); break; } if (begin_trans(thd)) goto error; send_ok(thd); break; case SQLCOM_COMMIT: if (end_trans(thd, lex->tx_release ? COMMIT_RELEASE : lex->tx_chain ? COMMIT_AND_CHAIN : COMMIT)) goto error; send_ok(thd); break; case SQLCOM_ROLLBACK: if (end_trans(thd, lex->tx_release ? ROLLBACK_RELEASE : lex->tx_chain ? ROLLBACK_AND_CHAIN : ROLLBACK)) goto error; send_ok(thd); break; case SQLCOM_RELEASE_SAVEPOINT: { SAVEPOINT *sv; for (sv=thd->transaction.savepoints; sv; sv=sv->prev) { if (my_strnncoll(system_charset_info, (uchar *)lex->ident.str, lex->ident.length, (uchar *)sv->name, sv->length) == 0) break; } if (sv) { if (ha_release_savepoint(thd, sv)) res= TRUE; // cannot happen else send_ok(thd); thd->transaction.savepoints=sv->prev; } else my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str); break; } case SQLCOM_ROLLBACK_TO_SAVEPOINT: { SAVEPOINT *sv; for (sv=thd->transaction.savepoints; sv; sv=sv->prev) { if (my_strnncoll(system_charset_info, (uchar *)lex->ident.str, lex->ident.length, (uchar *)sv->name, sv->length) == 0) break; } if (sv) { if (ha_rollback_to_savepoint(thd, sv)) res= TRUE; // cannot happen else { if (thd->no_trans_update.all && !thd->slave_thread) push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_WARNING_NOT_COMPLETE_ROLLBACK, ER(ER_WARNING_NOT_COMPLETE_ROLLBACK)); send_ok(thd); } thd->transaction.savepoints=sv; } else my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "SAVEPOINT", lex->ident.str); break; } case SQLCOM_SAVEPOINT: if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN) || thd->in_sub_stmt) || !opt_using_transactions) send_ok(thd); else { SAVEPOINT **sv, *newsv; for (sv=&thd->transaction.savepoints; *sv; sv=&(*sv)->prev) { if (my_strnncoll(system_charset_info, (uchar *)lex->ident.str, lex->ident.length, (uchar *)(*sv)->name, (*sv)->length) == 0) break; } if (*sv) /* old savepoint of the same name exists */ { newsv=*sv; ha_release_savepoint(thd, *sv); // it cannot fail *sv=(*sv)->prev; } else if ((newsv=(SAVEPOINT *) alloc_root(&thd->transaction.mem_root, savepoint_alloc_size)) == 0) { my_error(ER_OUT_OF_RESOURCES, MYF(0)); break; } newsv->name=strmake_root(&thd->transaction.mem_root, lex->ident.str, lex->ident.length); newsv->length=lex->ident.length; /* if we'll get an error here, don't add new savepoint to the list. we'll lose a little bit of memory in transaction mem_root, but it'll be free'd when transaction ends anyway */ if (ha_savepoint(thd, newsv)) res= TRUE; else { newsv->prev=thd->transaction.savepoints; thd->transaction.savepoints=newsv; send_ok(thd); } } break; case SQLCOM_CREATE_PROCEDURE: case SQLCOM_CREATE_SPFUNCTION: { uint namelen; char *name; int sp_result= SP_INTERNAL_ERROR; DBUG_ASSERT(lex->sphead != 0); DBUG_ASSERT(lex->sphead->m_db.str); /* Must be initialized in the parser */ /* Verify that the database name is allowed, optionally lowercase it. */ if (check_db_name(lex->sphead->m_db.str)) { my_error(ER_WRONG_DB_NAME, MYF(0), lex->sphead->m_db.str); goto create_sp_error; } /* Check that a database directory with this name exists. Design note: This won't work on virtual databases like information_schema. */ if (check_db_dir_existence(lex->sphead->m_db.str)) { my_error(ER_BAD_DB_ERROR, MYF(0), lex->sphead->m_db.str); goto create_sp_error; } if (check_access(thd, CREATE_PROC_ACL, lex->sphead->m_db.str, 0, 0, 0, is_schema_db(lex->sphead->m_db.str))) goto create_sp_error; if (end_active_trans(thd)) goto create_sp_error; name= lex->sphead->name(&namelen); #ifdef HAVE_DLOPEN if (lex->sphead->m_type == TYPE_ENUM_FUNCTION) { udf_func *udf = find_udf(name, namelen); if (udf) { my_error(ER_UDF_EXISTS, MYF(0), name); goto create_sp_error; } } #endif /* If the definer is not specified, this means that CREATE-statement missed DEFINER-clause. DEFINER-clause can be missed in two cases: - The user submitted a statement w/o the clause. This is a normal case, we should assign CURRENT_USER as definer. - Our slave received an updated from the master, that does not replicate definer for stored rountines. We should also assign CURRENT_USER as definer here, but also we should mark this routine as NON-SUID. This is essential for the sake of backward compatibility. The problem is the slave thread is running under "special" user (@), that actually does not exist. In the older versions we do not fail execution of a stored routine if its definer does not exist and continue the execution under the authorization of the invoker (BUG#13198). And now if we try to switch to slave-current-user (@), we will fail. Actually, this leads to the inconsistent state of master and slave (different definers, different SUID behaviour), but it seems, this is the best we can do. */ if (!lex->definer) { bool local_res= FALSE; Query_arena original_arena; Query_arena *ps_arena = thd->activate_stmt_arena_if_needed(&original_arena); if (!(lex->definer= create_default_definer(thd))) local_res= TRUE; if (ps_arena) thd->restore_active_arena(ps_arena, &original_arena); /* Error has been already reported. */ if (local_res) goto create_sp_error; if (thd->slave_thread) lex->sphead->m_chistics->suid= SP_IS_NOT_SUID; } /* If the specified definer differs from the current user, we should check that the current user has SUPER privilege (in order to create a stored routine under another user one must have SUPER privilege). */ else if (strcmp(lex->definer->user.str, thd->security_ctx->priv_user) || my_strcasecmp(system_charset_info, lex->definer->host.str, thd->security_ctx->priv_host)) { if (check_global_access(thd, SUPER_ACL)) { my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), "SUPER"); goto create_sp_error; } } /* Check that the specified definer exists. Emit a warning if not. */ #ifndef NO_EMBEDDED_ACCESS_CHECKS if (!is_acl_user(lex->definer->host.str, lex->definer->user.str)) { push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE, ER_NO_SUCH_USER, ER(ER_NO_SUCH_USER), lex->definer->user.str, lex->definer->host.str); } #endif /* NO_EMBEDDED_ACCESS_CHECKS */ res= (sp_result= lex->sphead->create(thd)); switch (sp_result) { case SP_OK: #ifndef NO_EMBEDDED_ACCESS_CHECKS /* only add privileges if really neccessary */ if (sp_automatic_privileges && !opt_noacl && check_routine_access(thd, DEFAULT_CREATE_PROC_ACLS, lex->sphead->m_db.str, name, lex->sql_command == SQLCOM_CREATE_PROCEDURE, 1)) { if (sp_grant_privileges(thd, lex->sphead->m_db.str, name, lex->sql_command == SQLCOM_CREATE_PROCEDURE)) push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_PROC_AUTO_GRANT_FAIL, ER(ER_PROC_AUTO_GRANT_FAIL)); close_thread_tables(thd); } #endif break; case SP_WRITE_ROW_FAILED: my_error(ER_SP_ALREADY_EXISTS, MYF(0), SP_TYPE_STRING(lex), name); break; case SP_BAD_IDENTIFIER: my_error(ER_TOO_LONG_IDENT, MYF(0), name); break; case SP_BODY_TOO_LONG: my_error(ER_TOO_LONG_BODY, MYF(0), name); break; default: my_error(ER_SP_STORE_FAILED, MYF(0), SP_TYPE_STRING(lex), name); break; } /* end switch */ /* Capture all errors within this CASE and clean up the environment. */ create_sp_error: if (sp_result != SP_OK ) goto error; send_ok(thd); break; /* break super switch */ } /* end case group bracket */ case SQLCOM_CALL: { sp_head *sp; /* This will cache all SP and SF and open and lock all tables required for execution. */ if (check_table_access(thd, SELECT_ACL, all_tables, 0) || open_and_lock_tables(thd, all_tables)) goto error; /* By this moment all needed SPs should be in cache so no need to look into DB. */ if (!(sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname, &thd->sp_proc_cache, TRUE))) { my_error(ER_SP_DOES_NOT_EXIST, MYF(0), "PROCEDURE", lex->spname->m_qname.str); goto error; } else { ha_rows select_limit; /* bits that should be cleared in thd->server_status */ uint bits_to_be_cleared= 0; /* Check that the stored procedure doesn't contain Dynamic SQL and doesn't return result sets: such stored procedures can't be called from a function or trigger. */ if (thd->in_sub_stmt) { const char *where= (thd->in_sub_stmt & SUB_STMT_TRIGGER ? "trigger" : "function"); if (sp->is_not_allowed_in_function(where)) goto error; } my_bool save_no_send_ok= thd->net.no_send_ok; thd->net.no_send_ok= TRUE; if (sp->m_flags & sp_head::MULTI_RESULTS) { if (! (thd->client_capabilities & CLIENT_MULTI_RESULTS)) { /* The client does not support multiple result sets being sent back */ my_error(ER_SP_BADSELECT, MYF(0), sp->m_qname.str); thd->net.no_send_ok= save_no_send_ok; goto error; } /* If SERVER_MORE_RESULTS_EXISTS is not set, then remember that it should be cleared */ bits_to_be_cleared= (~thd->server_status & SERVER_MORE_RESULTS_EXISTS); thd->server_status|= SERVER_MORE_RESULTS_EXISTS; } #ifndef NO_EMBEDDED_ACCESS_CHECKS if (check_routine_access(thd, EXECUTE_ACL, sp->m_db.str, sp->m_name.str, TRUE, FALSE)) { thd->net.no_send_ok= save_no_send_ok; goto error; } #endif select_limit= thd->variables.select_limit; thd->variables.select_limit= HA_POS_ERROR; /* We never write CALL statements into binlog: - If the mode is non-prelocked, each statement will be logged separately. - If the mode is prelocked, the invoking statement will care about writing into binlog. So just execute the statement. */ res= sp->execute_procedure(thd, &lex->value_list); /* If warnings have been cleared, we have to clear total_warn_count too, otherwise the clients get confused. */ if (thd->warn_list.is_empty()) thd->total_warn_count= 0; thd->variables.select_limit= select_limit; thd->net.no_send_ok= save_no_send_ok; thd->server_status&= ~bits_to_be_cleared; if (!res) send_ok(thd, (ulong) (thd->row_count_func < 0 ? 0 : thd->row_count_func)); else goto error; // Substatement should already have sent error } break; } case SQLCOM_ALTER_PROCEDURE: case SQLCOM_ALTER_FUNCTION: { int sp_result; sp_head *sp; st_sp_chistics chistics; memcpy(&chistics, &lex->sp_chistics, sizeof(chistics)); if (lex->sql_command == SQLCOM_ALTER_PROCEDURE) sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname, &thd->sp_proc_cache, FALSE); else sp= sp_find_routine(thd, TYPE_ENUM_FUNCTION, lex->spname, &thd->sp_func_cache, FALSE); mysql_reset_errors(thd, 0); if (! sp) { if (lex->spname->m_db.str) sp_result= SP_KEY_NOT_FOUND; else { my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0)); goto error; } } else { if (check_routine_access(thd, ALTER_PROC_ACL, sp->m_db.str, sp->m_name.str, lex->sql_command == SQLCOM_ALTER_PROCEDURE, 0)) goto error; if (end_active_trans(thd)) goto error; memcpy(&lex->sp_chistics, &chistics, sizeof(lex->sp_chistics)); if ((sp->m_type == TYPE_ENUM_FUNCTION) && !trust_function_creators && mysql_bin_log.is_open() && !sp->m_chistics->detistic && (chistics.daccess == SP_CONTAINS_SQL || chistics.daccess == SP_MODIFIES_SQL_DATA)) { my_message(ER_BINLOG_UNSAFE_ROUTINE, ER(ER_BINLOG_UNSAFE_ROUTINE), MYF(0)); sp_result= SP_INTERNAL_ERROR; } else { /* Note that if you implement the capability of ALTER FUNCTION to alter the body of the function, this command should be made to follow the restrictions that log-bin-trust-function-creators=0 already puts on CREATE FUNCTION. */ /* Conditionally writes to binlog */ if (lex->sql_command == SQLCOM_ALTER_PROCEDURE) sp_result= sp_update_procedure(thd, lex->spname, &lex->sp_chistics); else sp_result= sp_update_function(thd, lex->spname, &lex->sp_chistics); } } switch (sp_result) { case SP_OK: send_ok(thd); break; case SP_KEY_NOT_FOUND: my_error(ER_SP_DOES_NOT_EXIST, MYF(0), SP_COM_STRING(lex), lex->spname->m_qname.str); goto error; default: my_error(ER_SP_CANT_ALTER, MYF(0), SP_COM_STRING(lex), lex->spname->m_qname.str); goto error; } break; } case SQLCOM_DROP_PROCEDURE: case SQLCOM_DROP_FUNCTION: { int sp_result; int type= (lex->sql_command == SQLCOM_DROP_PROCEDURE ? TYPE_ENUM_PROCEDURE : TYPE_ENUM_FUNCTION); sp_result= sp_routine_exists_in_table(thd, type, lex->spname); mysql_reset_errors(thd, 0); if (sp_result == SP_OK) { char *db= lex->spname->m_db.str; char *name= lex->spname->m_name.str; if (check_routine_access(thd, ALTER_PROC_ACL, db, name, lex->sql_command == SQLCOM_DROP_PROCEDURE, 0)) goto error; if (end_active_trans(thd)) goto error; #ifndef NO_EMBEDDED_ACCESS_CHECKS if (sp_automatic_privileges && !opt_noacl && sp_revoke_privileges(thd, db, name, lex->sql_command == SQLCOM_DROP_PROCEDURE)) { push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_PROC_AUTO_REVOKE_FAIL, ER(ER_PROC_AUTO_REVOKE_FAIL)); } #endif /* Conditionally writes to binlog */ if (lex->sql_command == SQLCOM_DROP_PROCEDURE) sp_result= sp_drop_procedure(thd, lex->spname); else sp_result= sp_drop_function(thd, lex->spname); } else { #ifdef HAVE_DLOPEN if (lex->sql_command == SQLCOM_DROP_FUNCTION) { udf_func *udf = find_udf(lex->spname->m_name.str, lex->spname->m_name.length); if (udf) { if (check_access(thd, DELETE_ACL, "mysql", 0, 1, 0, 0)) goto error; /* Does NOT write to binlog */ if (!(res = mysql_drop_function(thd, &lex->spname->m_name))) { send_ok(thd); break; } } } #endif if (lex->spname->m_db.str) sp_result= SP_KEY_NOT_FOUND; else { my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0)); goto error; } } res= sp_result; switch (sp_result) { case SP_OK: send_ok(thd); break; case SP_KEY_NOT_FOUND: if (lex->drop_if_exists) { push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE, ER_SP_DOES_NOT_EXIST, ER(ER_SP_DOES_NOT_EXIST), SP_COM_STRING(lex), lex->spname->m_name.str); res= FALSE; send_ok(thd); break; } my_error(ER_SP_DOES_NOT_EXIST, MYF(0), SP_COM_STRING(lex), lex->spname->m_qname.str); goto error; default: my_error(ER_SP_DROP_FAILED, MYF(0), SP_COM_STRING(lex), lex->spname->m_qname.str); goto error; } break; } case SQLCOM_SHOW_CREATE_PROC: { if (lex->spname->m_name.length > NAME_LEN) { my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str); goto error; } if (sp_show_create_procedure(thd, lex->spname) != SP_OK) { /* We don't distinguish between errors for now */ my_error(ER_SP_DOES_NOT_EXIST, MYF(0), SP_COM_STRING(lex), lex->spname->m_name.str); goto error; } break; } case SQLCOM_SHOW_CREATE_FUNC: { if (lex->spname->m_name.length > NAME_LEN) { my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str); goto error; } if (sp_show_create_function(thd, lex->spname) != SP_OK) { /* We don't distinguish between errors for now */ my_error(ER_SP_DOES_NOT_EXIST, MYF(0), SP_COM_STRING(lex), lex->spname->m_name.str); goto error; } break; } case SQLCOM_SHOW_STATUS_PROC: { res= sp_show_status_procedure(thd, (lex->wild ? lex->wild->ptr() : NullS)); break; } case SQLCOM_SHOW_STATUS_FUNC: { res= sp_show_status_function(thd, (lex->wild ? lex->wild->ptr() : NullS)); break; } #ifndef DBUG_OFF case SQLCOM_SHOW_PROC_CODE: case SQLCOM_SHOW_FUNC_CODE: { sp_head *sp; if (lex->spname->m_name.length > NAME_LEN) { my_error(ER_TOO_LONG_IDENT, MYF(0), lex->spname->m_name.str); goto error; } if (lex->sql_command == SQLCOM_SHOW_PROC_CODE) sp= sp_find_routine(thd, TYPE_ENUM_PROCEDURE, lex->spname, &thd->sp_proc_cache, FALSE); else sp= sp_find_routine(thd, TYPE_ENUM_FUNCTION, lex->spname, &thd->sp_func_cache, FALSE); if (!sp || sp->show_routine_code(thd)) { /* We don't distinguish between errors for now */ my_error(ER_SP_DOES_NOT_EXIST, MYF(0), SP_COM_STRING(lex), lex->spname->m_name.str); goto error; } break; } #endif // ifndef DBUG_OFF case SQLCOM_CREATE_VIEW: { if (end_active_trans(thd)) goto error; res= mysql_create_view(thd, first_table, thd->lex->create_view_mode); break; } case SQLCOM_DROP_VIEW: { if (check_table_access(thd, DROP_ACL, all_tables, 0) || end_active_trans(thd)) goto error; /* Conditionally writes to binlog. */ res= mysql_drop_view(thd, first_table, thd->lex->drop_mode); break; } case SQLCOM_CREATE_TRIGGER: { if (end_active_trans(thd)) goto error; /* Conditionally writes to binlog. */ res= mysql_create_or_drop_trigger(thd, all_tables, 1); break; } case SQLCOM_DROP_TRIGGER: { if (end_active_trans(thd)) goto error; /* Conditionally writes to binlog. */ res= mysql_create_or_drop_trigger(thd, all_tables, 0); break; } case SQLCOM_XA_START: if (thd->transaction.xid_state.xa_state == XA_IDLE && thd->lex->xa_opt == XA_RESUME) { if (! thd->transaction.xid_state.xid.eq(thd->lex->xid)) { my_error(ER_XAER_NOTA, MYF(0)); break; } thd->transaction.xid_state.xa_state=XA_ACTIVE; send_ok(thd); break; } if (thd->lex->xa_opt != XA_NONE) { // JOIN is not supported yet. TODO my_error(ER_XAER_INVAL, MYF(0)); break; } if (thd->transaction.xid_state.xa_state != XA_NOTR) { my_error(ER_XAER_RMFAIL, MYF(0), xa_state_names[thd->transaction.xid_state.xa_state]); break; } if (thd->active_transaction() || thd->locked_tables) { my_error(ER_XAER_OUTSIDE, MYF(0)); break; } if (xid_cache_search(thd->lex->xid)) { my_error(ER_XAER_DUPID, MYF(0)); break; } DBUG_ASSERT(thd->transaction.xid_state.xid.is_null()); thd->transaction.xid_state.xa_state=XA_ACTIVE; thd->transaction.xid_state.xid.set(thd->lex->xid); xid_cache_insert(&thd->transaction.xid_state); thd->no_trans_update.all= FALSE; thd->options|= (ulong) OPTION_BEGIN; thd->server_status|= SERVER_STATUS_IN_TRANS; send_ok(thd); break; case SQLCOM_XA_END: /* fake it */ if (thd->lex->xa_opt != XA_NONE) { // SUSPEND and FOR MIGRATE are not supported yet. TODO my_error(ER_XAER_INVAL, MYF(0)); break; } if (thd->transaction.xid_state.xa_state != XA_ACTIVE) { my_error(ER_XAER_RMFAIL, MYF(0), xa_state_names[thd->transaction.xid_state.xa_state]); break; } if (!thd->transaction.xid_state.xid.eq(thd->lex->xid)) { my_error(ER_XAER_NOTA, MYF(0)); break; } thd->transaction.xid_state.xa_state=XA_IDLE; send_ok(thd); break; case SQLCOM_XA_PREPARE: if (thd->transaction.xid_state.xa_state != XA_IDLE) { my_error(ER_XAER_RMFAIL, MYF(0), xa_state_names[thd->transaction.xid_state.xa_state]); break; } if (!thd->transaction.xid_state.xid.eq(thd->lex->xid)) { my_error(ER_XAER_NOTA, MYF(0)); break; } if (ha_prepare(thd)) { my_error(ER_XA_RBROLLBACK, MYF(0)); xid_cache_delete(&thd->transaction.xid_state); thd->transaction.xid_state.xa_state=XA_NOTR; break; } thd->transaction.xid_state.xa_state=XA_PREPARED; send_ok(thd); break; case SQLCOM_XA_COMMIT: if (!thd->transaction.xid_state.xid.eq(thd->lex->xid)) { XID_STATE *xs=xid_cache_search(thd->lex->xid); if (!xs || xs->in_thd) my_error(ER_XAER_NOTA, MYF(0)); else { ha_commit_or_rollback_by_xid(thd->lex->xid, 1); xid_cache_delete(xs); send_ok(thd); } break; } if (thd->transaction.xid_state.xa_state == XA_IDLE && thd->lex->xa_opt == XA_ONE_PHASE) { int r; if ((r= ha_commit(thd))) my_error(r == 1 ? ER_XA_RBROLLBACK : ER_XAER_RMERR, MYF(0)); else send_ok(thd); } else if (thd->transaction.xid_state.xa_state == XA_PREPARED && thd->lex->xa_opt == XA_NONE) { if (wait_if_global_read_lock(thd, 0, 0)) { ha_rollback(thd); my_error(ER_XAER_RMERR, MYF(0)); } else { if (ha_commit_one_phase(thd, 1)) my_error(ER_XAER_RMERR, MYF(0)); else send_ok(thd); start_waiting_global_read_lock(thd); } } else { my_error(ER_XAER_RMFAIL, MYF(0), xa_state_names[thd->transaction.xid_state.xa_state]); break; } thd->options&= ~(ulong) OPTION_BEGIN; thd->no_trans_update.all= FALSE; thd->server_status&= ~SERVER_STATUS_IN_TRANS; xid_cache_delete(&thd->transaction.xid_state); thd->transaction.xid_state.xa_state=XA_NOTR; break; case SQLCOM_XA_ROLLBACK: if (!thd->transaction.xid_state.xid.eq(thd->lex->xid)) { XID_STATE *xs=xid_cache_search(thd->lex->xid); if (!xs || xs->in_thd) my_error(ER_XAER_NOTA, MYF(0)); else { ha_commit_or_rollback_by_xid(thd->lex->xid, 0); xid_cache_delete(xs); send_ok(thd); } break; } if (thd->transaction.xid_state.xa_state != XA_IDLE && thd->transaction.xid_state.xa_state != XA_PREPARED) { my_error(ER_XAER_RMFAIL, MYF(0), xa_state_names[thd->transaction.xid_state.xa_state]); break; } if (ha_rollback(thd)) my_error(ER_XAER_RMERR, MYF(0)); else send_ok(thd); thd->options&= ~(ulong) OPTION_BEGIN; thd->no_trans_update.all= FALSE; thd->server_status&= ~SERVER_STATUS_IN_TRANS; xid_cache_delete(&thd->transaction.xid_state); thd->transaction.xid_state.xa_state=XA_NOTR; break; case SQLCOM_XA_RECOVER: res= mysql_xa_recover(thd); break; default: #ifndef EMBEDDED_LIBRARY DBUG_ASSERT(0); /* Impossible */ #endif send_ok(thd); break; } thd->proc_info="query end"; /* Two binlog-related cleanups: */ /* Reset system variables temporarily modified by SET ONE SHOT. Exception: 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 (thd->one_shot_set && lex->sql_command != SQLCOM_SET_OPTION) reset_one_shot_variables(thd); /* The return value for ROW_COUNT() is "implementation dependent" if the statement is not DELETE, INSERT or UPDATE, but -1 is what JDBC and ODBC wants. We do not change the value for a CALL or EXECUTE statement, so the value generated by the last called (or executed) statement is preserved. */ if (lex->sql_command != SQLCOM_CALL && lex->sql_command != SQLCOM_EXECUTE && uc_update_queries[lex->sql_command]<2) thd->row_count_func= -1; goto end; error: res= TRUE; end: if (need_start_waiting) { /* Release the protection against the global read lock and wake everyone, who might want to set a global read lock. */ start_waiting_global_read_lock(thd); } DBUG_RETURN(res || thd->net.report_error); } /* Check grants for commands which work only with one table. SYNOPSIS check_single_table_access() thd Thread handler privilege requested privilege all_tables global table list of query RETURN 0 - OK 1 - access denied, error is sent to client */ bool check_single_table_access(THD *thd, ulong privilege, TABLE_LIST *all_tables) { Security_context * backup_ctx= thd->security_ctx; /* we need to switch to the saved context (if any) */ if (all_tables->security_ctx) thd->security_ctx= all_tables->security_ctx; const char *db_name; if ((all_tables->view || all_tables->field_translation) && !all_tables->schema_table) db_name= all_tables->view_db.str; else db_name= all_tables->db; if (check_access(thd, privilege, db_name, &all_tables->grant.privilege, 0, 0, test(all_tables->schema_table))) goto deny; /* Show only 1 table for check_grant */ if (grant_option && !(all_tables->belong_to_view && (thd->lex->sql_command == SQLCOM_SHOW_FIELDS)) && check_grant(thd, privilege, all_tables, 0, 1, 0)) goto deny; thd->security_ctx= backup_ctx; return 0; deny: thd->security_ctx= backup_ctx; return 1; } /* Check grants for commands which work only with one table and all other tables belonging to subselects or implicitly opened tables. SYNOPSIS check_one_table_access() thd Thread handler privilege requested privilege all_tables global table list of query RETURN 0 - OK 1 - access denied, error is sent to client */ bool check_one_table_access(THD *thd, ulong privilege, TABLE_LIST *all_tables) { if (check_single_table_access (thd,privilege,all_tables)) return 1; /* Check rights on tables of subselects and implictly opened tables */ TABLE_LIST *subselects_tables, *view= all_tables->view ? all_tables : 0; if ((subselects_tables= all_tables->next_global)) { /* Access rights asked for the first table of a view should be the same as for the view */ if (view && subselects_tables->belong_to_view == view) { if (check_single_table_access (thd, privilege, subselects_tables)) return 1; subselects_tables= subselects_tables->next_global; } if (subselects_tables && (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, bool schema_db) { Security_context *sctx= thd->security_ctx; #ifndef NO_EMBEDDED_ACCESS_CHECKS ulong db_access; bool db_is_pattern= test(want_access & GRANT_ACL); #endif ulong dummy; DBUG_ENTER("check_access"); DBUG_PRINT("enter",("db: %s want_access: %lu master_access: %lu", db ? db : "", want_access, sctx->master_access)); if (save_priv) *save_priv=0; else save_priv= &dummy; if ((!db || !db[0]) && !thd->db && !dont_check_global_grants) { DBUG_PRINT("error",("No database")); if (!no_errors) my_message(ER_NO_DB_ERROR, ER(ER_NO_DB_ERROR), MYF(0)); /* purecov: tested */ DBUG_RETURN(TRUE); /* purecov: tested */ } if (schema_db) { if (!(sctx->master_access & FILE_ACL) && (want_access & FILE_ACL) || (want_access & ~(SELECT_ACL | EXTRA_ACL | FILE_ACL))) { if (!no_errors) { const char *db_name= db ? db : thd->db; my_error(ER_DBACCESS_DENIED_ERROR, MYF(0), sctx->priv_user, sctx->priv_host, db_name); } DBUG_RETURN(TRUE); } else { *save_priv= SELECT_ACL; DBUG_RETURN(FALSE); } } #ifdef NO_EMBEDDED_ACCESS_CHECKS DBUG_RETURN(0); #else if ((sctx->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= sctx->db_access; if (!(sctx->master_access & SELECT_ACL) && (db && (!thd->db || db_is_pattern || strcmp(db,thd->db)))) db_access=acl_get(sctx->host, sctx->ip, sctx->priv_user, db, db_is_pattern); *save_priv=sctx->master_access | db_access; DBUG_RETURN(FALSE); } if (((want_access & ~sctx->master_access) & ~(DB_ACLS | EXTRA_ACL)) || ! db && dont_check_global_grants) { // We can never grant this DBUG_PRINT("error",("No possible access")); if (!no_errors) my_error(ER_ACCESS_DENIED_ERROR, MYF(0), sctx->priv_user, sctx->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 || db_is_pattern || strcmp(db,thd->db))) db_access= acl_get(sctx->host, sctx->ip, sctx->priv_user, db, db_is_pattern); else db_access= sctx->db_access; DBUG_PRINT("info",("db_access: %lu", db_access)); /* Remove SHOW attribute and access rights we already have */ want_access &= ~(sctx->master_access | EXTRA_ACL); DBUG_PRINT("info",("db_access: %lu want_access: %lu", db_access, want_access)); db_access= ((*save_priv=(db_access | sctx->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 | PROC_ACLS)))) DBUG_RETURN(FALSE); /* Ok */ DBUG_PRINT("error",("Access denied")); if (!no_errors) my_error(ER_DBACCESS_DENIED_ERROR, MYF(0), sctx->priv_user, sctx->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 right 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->security_ctx->master_access & want_access)) return 0; get_privilege_desc(command, sizeof(command), want_access); my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), command); return 1; #endif /* NO_EMBEDDED_ACCESS_CHECKS */ } static bool check_show_access(THD *thd, TABLE_LIST *table) { switch (get_schema_table_idx(table->schema_table)) { case SCH_SCHEMATA: return (specialflag & SPECIAL_SKIP_SHOW_DB) && check_global_access(thd, SHOW_DB_ACL); case SCH_TABLE_NAMES: case SCH_TABLES: case SCH_VIEWS: case SCH_TRIGGERS: { const char *dst_db_name= table->schema_select_lex->db; DBUG_ASSERT(dst_db_name); if (check_access(thd, SELECT_ACL, dst_db_name, &thd->col_access, FALSE, FALSE, is_schema_db(dst_db_name))) { return TRUE; } if (!thd->col_access && check_grant_db(thd, dst_db_name)) { my_error(ER_DBACCESS_DENIED_ERROR, MYF(0), thd->security_ctx->priv_user, thd->security_ctx->priv_host, dst_db_name); return TRUE; } return FALSE; } case SCH_COLUMNS: case SCH_STATISTICS: { TABLE_LIST *dst_table= (TABLE_LIST *) table->schema_select_lex->table_list.first; DBUG_ASSERT(dst_table); if (check_access(thd, SELECT_ACL | EXTRA_ACL, dst_table->db, &dst_table->grant.privilege, FALSE, FALSE, test(dst_table->schema_table))) { return FALSE; } return grant_option && check_grant(thd, SELECT_ACL, dst_table, 2, UINT_MAX, FALSE); } case SCH_OPEN_TABLES: case SCH_VARIABLES: case SCH_STATUS: case SCH_PROCEDURES: case SCH_CHARSETS: case SCH_COLLATIONS: case SCH_COLLATION_CHARACTER_SET_APPLICABILITY: case SCH_USER_PRIVILEGES: case SCH_SCHEMA_PRIVILEGES: case SCH_TABLE_PRIVILEGES: case SCH_COLUMN_PRIVILEGES: case SCH_TABLE_CONSTRAINTS: case SCH_KEY_COLUMN_USAGE: break; } return FALSE; } /* Check the privilege for all used tables. SYNOPSYS check_table_access() thd Thread context want_access Privileges requested tables List of tables to be checked no_errors FALSE/TRUE - report/don't report error to the client (using my_error() call). NOTES Table privileges are cached in the table list for GRANT checking. This functions assumes that table list used and thd->lex->query_tables_own_last value correspond to each other (the latter should be either 0 or point to next_global member of one of elements of this table list). RETURN VALUE FALSE - OK TRUE - Access denied */ bool check_table_access(THD *thd, ulong want_access,TABLE_LIST *tables, bool no_errors) { uint found=0; ulong found_access=0; #ifndef NO_EMBEDDED_ACCESS_CHECKS TABLE_LIST *org_tables= tables; #endif TABLE_LIST *first_not_own_table= thd->lex->first_not_own_table(); Security_context *sctx= thd->security_ctx, *backup_ctx= thd->security_ctx; /* The check that first_not_own_table is not reached is for the case when the given table list refers to the list for prelocking (contains tables of other queries). For simple queries first_not_own_table is 0. */ for (; tables != first_not_own_table; tables= tables->next_global) { if (tables->security_ctx) sctx= tables->security_ctx; else sctx= backup_ctx; if (tables->schema_table && (want_access & ~(SELECT_ACL | EXTRA_ACL | FILE_ACL))) { if (!no_errors) my_error(ER_DBACCESS_DENIED_ERROR, MYF(0), sctx->priv_user, sctx->priv_host, INFORMATION_SCHEMA_NAME.str); return TRUE; } /* Register access for view underlying table. Remove SHOW_VIEW_ACL, because it will be checked during making view */ tables->grant.orig_want_privilege= (want_access & ~SHOW_VIEW_ACL); if (tables->schema_table_reformed) { if (check_show_access(thd, tables)) goto deny; continue; } if (tables->derived || (tables->table && (int)tables->table->s->tmp_table) || my_tz_check_n_skip_implicit_tables(&tables, thd->lex->time_zone_tables_used)) continue; thd->security_ctx= sctx; if ((sctx->master_access & want_access) == (want_access & ~EXTRA_ACL) && thd->db) tables->grant.privilege= want_access; else if (tables->db && thd->db && strcmp(tables->db, thd->db) == 0) { 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, test(tables->schema_table))) goto deny; // Access denied found_access=tables->grant.privilege; found=1; } } else if (check_access(thd,want_access,tables->db,&tables->grant.privilege, 0, no_errors, test(tables->schema_table))) goto deny; } thd->security_ctx= backup_ctx; if (grant_option) return check_grant(thd,want_access & ~EXTRA_ACL,org_tables, test(want_access & EXTRA_ACL), UINT_MAX, no_errors); return FALSE; deny: thd->security_ctx= backup_ctx; return TRUE; } bool check_routine_access(THD *thd, ulong want_access,char *db, char *name, bool is_proc, bool no_errors) { TABLE_LIST tables[1]; bzero((char *)tables, sizeof(TABLE_LIST)); tables->db= db; tables->table_name= tables->alias= name; /* The following test is just a shortcut for check_access() (to avoid calculating db_access) under the assumption that it's common to give persons global right to execute all stored SP (but not necessary to create them). */ if ((thd->security_ctx->master_access & want_access) == want_access) tables->grant.privilege= want_access; else if (check_access(thd,want_access,db,&tables->grant.privilege, 0, no_errors, 0)) return TRUE; #ifndef NO_EMBEDDED_ACCESS_CHECKS if (grant_option) return check_grant_routine(thd, want_access, tables, is_proc, no_errors); #endif return FALSE; } /* Check if the routine has any of the routine privileges SYNOPSIS check_some_routine_access() thd Thread handler db Database name name Routine name RETURN 0 ok 1 error */ bool check_some_routine_access(THD *thd, const char *db, const char *name, bool is_proc) { ulong save_priv; if (thd->security_ctx->master_access & SHOW_PROC_ACLS) return FALSE; /* There are no routines in information_schema db. So we can safely pass zero to last paramter of check_access function */ if (!check_access(thd, SHOW_PROC_ACLS, db, &save_priv, 0, 1, 0) || (save_priv & SHOW_PROC_ACLS)) return FALSE; return check_routine_level_acl(thd, db, name, is_proc); } /* Check if the given table has any of the asked privileges SYNOPSIS check_some_access() thd Thread handler want_access Bitmap of possible privileges to check for RETURN 0 ok 1 error */ bool check_some_access(THD *thd, ulong want_access, TABLE_LIST *table) { ulong access; DBUG_ENTER("check_some_access"); /* This loop will work as long as we have less than 32 privileges */ for (access= 1; access < want_access ; access<<= 1) { if (access & want_access) { if (!check_access(thd, access, table->db, &table->grant.privilege, 0, 1, test(table->schema_table)) && !grant_option || !check_grant(thd, access, table, 0, 1, 1)) DBUG_RETURN(0); } } DBUG_PRINT("exit",("no matching access rights")); DBUG_RETURN(1); } 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_local) { 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) { char *current_db= NULL; for (; tables; tables= tables->next_global) { if (tables->db == NULL) { /* This code never works and should be removed in 5.1. All tables that are added to the list of tables should already have its database field initialized properly (see st_lex::add_table_to_list). */ DBUG_ASSERT(0); if (thd->copy_db_to(¤t_db, 0)) return TRUE; tables->db= current_db; } } 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 /* Note: The 'buf' parameter is necessary, even if it is unused here. - fix_fields functions has a "dummy" buffer large enough for the corresponding exec. (Thus we only have to check in fix_fields.) - Passing to check_stack_overrun() prevents the compiler from removing it. */ bool check_stack_overrun(THD *thd, long margin, char *buf __attribute__((unused))) { long stack_used; DBUG_ASSERT(thd == current_thd); if ((stack_used=used_stack(thd->thread_stack,(char*) &stack_used)) >= (long) (thread_stack - margin)) { sprintf(errbuff[0],ER(ER_STACK_OVERRUN_NEED_MORE), stack_used,thread_stack,margin); my_message(ER_STACK_OVERRUN_NEED_MORE,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_thd->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_start(thd, buf, length); mysql_reset_thd_for_next_command(thd); DBUG_VOID_RETURN; } /* Reset THD part responsible for command processing state. DESCRIPTION This needs to be called before execution of every statement (prepared or conventional). TODO Make it a method of THD and align its name with the rest of reset/end/start/init methods. Call it after we use THD for queries, not before. */ void mysql_reset_thd_for_next_command(THD *thd) { DBUG_ENTER("mysql_reset_thd_for_next_command"); thd->free_list= 0; thd->select_number= 1; thd->query_start_used= thd->insert_id_used=0; thd->last_insert_id_used_bin_log= FALSE; thd->is_fatal_error= thd->time_zone_used= 0; thd->server_status&= ~ (SERVER_MORE_RESULTS_EXISTS | SERVER_QUERY_NO_INDEX_USED | SERVER_QUERY_NO_GOOD_INDEX_USED); DBUG_ASSERT(thd->security_ctx== &thd->main_security_ctx); thd->tmp_table_used= 0; if (!thd->in_sub_stmt) { if (opt_bin_log) { reset_dynamic(&thd->user_var_events); thd->user_var_events_alloc= thd->mem_root; } thd->clear_error(); thd->total_warn_count=0; // Warnings for this query thd->rand_used= 0; thd->sent_row_count= thd->examined_row_count= 0; } DBUG_VOID_RETURN; } void mysql_init_select(LEX *lex) { SELECT_LEX *select_lex= lex->current_select; select_lex->init_select(); lex->wild= 0; if (select_lex == &lex->select_lex) { DBUG_ASSERT(lex->result == 0); lex->exchange= 0; } } bool mysql_new_select(LEX *lex, bool move_down) { SELECT_LEX *select_lex; THD *thd= lex->thd; DBUG_ENTER("mysql_new_select"); if (!(select_lex= new (thd->mem_root) SELECT_LEX())) DBUG_RETURN(1); select_lex->select_number= ++thd->select_number; select_lex->parent_lex= lex; /* Used in init_query. */ select_lex->init_query(); select_lex->init_select(); lex->nest_level++; select_lex->nest_level= lex->nest_level; /* Don't evaluate this subquery during statement prepare even if it's a constant one. The flag is switched off in the end of mysql_stmt_prepare. */ if (thd->stmt_arena->is_stmt_prepare()) select_lex->uncacheable|= UNCACHEABLE_PREPARE; if (move_down) { SELECT_LEX_UNIT *unit; lex->subqueries= TRUE; /* first select_lex of subselect or derived table */ if (!(unit= new (thd->mem_root) SELECT_LEX_UNIT())) DBUG_RETURN(1); unit->init_query(); unit->init_select(); unit->thd= 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); /* By default we assume that it is usual subselect and we have outer name resolution context, if no we will assign it to 0 later */ select_lex->context.outer_context= &select_lex->outer_select()->context; } else { if (lex->current_select->order_list.first && !lex->current_select->braces) { my_error(ER_WRONG_USAGE, MYF(0), "UNION", "ORDER BY"); DBUG_RETURN(1); } select_lex->include_neighbour(lex->current_select); SELECT_LEX_UNIT *unit= select_lex->master_unit(); if (!unit->fake_select_lex && unit->add_fake_select_lex(lex->thd)) DBUG_RETURN(1); select_lex->context.outer_context= unit->first_select()->context.outer_context; } 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; /* in subquery is SELECT query and we allow resolution of names in SELECT list */ select_lex->context.resolve_in_select_list= TRUE; DBUG_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; Item *var; char buff[MAX_SYS_VAR_LENGTH*2+4+8], *end; 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)); /* We set the name of Item to @@session.var_name because that then is used as the column name in the output. */ if ((var= get_system_var(thd, OPT_SESSION, tmp, null_lex_string))) { end= strxmov(buff, "@@session.", var_name, NullS); var->set_name(buff, end-buff, system_charset_info); add_item_to_list(thd, var); } 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= 0; lex->unit.select_limit_cnt= HA_POS_ERROR; lex->select_lex.table_list.save_and_clear(&lex->auxiliary_table_list); lex->lock_option= using_update_log ? TL_READ_NO_INSERT : TL_READ; lex->query_tables= 0; lex->query_tables_last= &lex->query_tables; } /* 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"); DBUG_EXECUTE_IF("parser_debug", turn_parser_debug_on();); mysql_init_query(thd, (uchar*) inBuf, length); if (query_cache_send_result_to_client(thd, inBuf, length) <= 0) { LEX *lex= thd->lex; sp_cache_flush_obsolete(&thd->sp_proc_cache); sp_cache_flush_obsolete(&thd->sp_func_cache); if (!MYSQLparse((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) { /* Binlog logs a string starting from thd->query and having length thd->query_length; so we set thd->query_length correctly (to not log several statements in one event, when we executed only first). We set it to not see the ';' (otherwise it would get into binlog and Query_log_event::print() would give ';;' output). This also helps display only the current query in SHOW PROCESSLIST. Note that we don't need LOCK_thread_count to modify query_length. */ if (lex->found_semicolon && (thd->query_length= (ulong)(lex->found_semicolon - thd->query))) thd->query_length--; /* Actually execute the query */ mysql_execute_command(thd); query_cache_end_of_result(thd); } } } else { DBUG_ASSERT(thd->net.report_error); DBUG_PRINT("info",("Command aborted. Fatal_error: %d", thd->is_fatal_error)); query_cache_abort(&thd->net); } if (thd->lex->sphead) { delete thd->lex->sphead; thd->lex->sphead= 0; } lex->unit.cleanup(); thd->proc_info="freeing items"; thd->end_statement(); thd->cleanup_after_query(); DBUG_ASSERT(thd->change_list.is_empty()); } 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; DBUG_ENTER("mysql_test_parse_for_slave"); mysql_init_query(thd, (uchar*) inBuf, length); if (!MYSQLparse((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(); thd->cleanup_after_query(); DBUG_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, List<String> *interval_list, CHARSET_INFO *cs, uint uint_geom_type) { register create_field *new_field; LEX *lex= thd->lex; DBUG_ENTER("add_field_to_list"); if (strlen(field_name) > NAME_LEN) { my_error(ER_TOO_LONG_IDENT, MYF(0), 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->alter_info.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->alter_info.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)) { my_error(ER_INVALID_DEFAULT, MYF(0), field_name); DBUG_RETURN(1); } else if (default_value->type() == Item::NULL_ITEM) { default_value= 0; if ((type_modifier & (NOT_NULL_FLAG | AUTO_INCREMENT_FLAG)) == NOT_NULL_FLAG) { my_error(ER_INVALID_DEFAULT, MYF(0), field_name); DBUG_RETURN(1); } } else if (type_modifier & AUTO_INCREMENT_FLAG) { my_error(ER_INVALID_DEFAULT, MYF(0), field_name); DBUG_RETURN(1); } } if (on_update_value && type != FIELD_TYPE_TIMESTAMP) { my_error(ER_INVALID_ON_UPDATE, MYF(0), field_name); DBUG_RETURN(1); } if (type == FIELD_TYPE_TIMESTAMP && length) { /* Display widths are no longer supported for TIMSTAMP as of MySQL 4.1. In other words, for declarations such as TIMESTAMP(2), TIMESTAMP(4), and so on, the display width is ignored. */ char buf[32]; my_snprintf(buf, sizeof(buf), "TIMESTAMP(%s)", length); push_warning_printf(thd,MYSQL_ERROR::WARN_LEVEL_WARN, ER_WARN_DEPRECATED_SYNTAX, ER(ER_WARN_DEPRECATED_SYNTAX), buf, "TIMESTAMP"); } if (!(new_field= new create_field()) || new_field->init(thd, field_name, type, length, decimals, type_modifier, default_value, on_update_value, comment, change, interval_list, cs, uint_geom_type)) DBUG_RETURN(1); lex->alter_info.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_thd->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 (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; order->counter_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 TL_OPTION_ALIAS an alias in multi table DELETE 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; TABLE_LIST *previous_table_ref; /* The table preceding the current one. */ char *alias_str; LEX *lex= thd->lex; DBUG_ENTER("add_table_to_list"); LINT_INIT(previous_table_ref); if (!table) DBUG_RETURN(0); // End of memory alias_str= alias ? alias->str : table->table.str; if (!test(table_options & TL_OPTION_ALIAS) && check_table_name(table->table.str, table->table.length)) { my_error(ER_WRONG_TABLE_NAME, MYF(0), table->table.str); DBUG_RETURN(0); } if (!alias) /* Alias is case sensitive */ { if (table->sel) { my_message(ER_DERIVED_MUST_HAVE_ALIAS, ER(ER_DERIVED_MUST_HAVE_ALIAS), MYF(0)); 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) { if (table->is_derived_table() == FALSE && check_db_name(table->db.str)) { my_error(ER_WRONG_DB_NAME, MYF(0), table->db.str); DBUG_RETURN(0); } ptr->db= table->db.str; ptr->db_length= table->db.length; } else if (thd->copy_db_to(&ptr->db, &ptr->db_length)) DBUG_RETURN(0); ptr->alias= alias_str; if (lower_case_table_names && table->table.length) table->table.length= my_casedn_str(files_charset_info, table->table.str); ptr->table_name=table->table.str; ptr->table_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; if (!ptr->derived && !my_strcasecmp(system_charset_info, ptr->db, INFORMATION_SCHEMA_NAME.str)) { ST_SCHEMA_TABLE *schema_table= find_schema_table(thd, ptr->table_name); if (!schema_table || (schema_table->hidden && lex->orig_sql_command == SQLCOM_END)) // not a 'show' command { my_error(ER_UNKNOWN_TABLE, MYF(0), ptr->table_name, INFORMATION_SCHEMA_NAME.str); DBUG_RETURN(0); } ptr->schema_table_name= ptr->table_name; ptr->schema_table= schema_table; } ptr->select_lex= lex->current_select; 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) { TABLE_LIST *first_table= (TABLE_LIST*) table_list.first; if (lex->sql_command == SQLCOM_CREATE_VIEW) first_table= first_table ? first_table->next_local : NULL; for (TABLE_LIST *tables= first_table ; tables ; tables=tables->next_local) { if (!my_strcasecmp(table_alias_charset, alias_str, tables->alias) && !strcmp(ptr->db, tables->db)) { my_error(ER_NONUNIQ_TABLE, MYF(0), alias_str); /* purecov: tested */ DBUG_RETURN(0); /* purecov: tested */ } } } /* Store the table reference preceding the current one. */ if (table_list.elements > 0) { /* table_list.next points to the last inserted TABLE_LIST->next_local' element We don't use the offsetof() macro here to avoid warnings from gcc */ previous_table_ref= (TABLE_LIST*) ((char*) table_list.next - ((char*) &(ptr->next_local) - (char*) ptr)); /* Set next_name_resolution_table of the previous table reference to point to the current table reference. In effect the list TABLE_LIST::next_name_resolution_table coincides with TABLE_LIST::next_local. Later this may be changed in store_top_level_join_columns() for NATURAL/USING joins. */ previous_table_ref->next_name_resolution_table= ptr; } /* Link the current table reference in a local list (list for current select). Notice that as a side effect here we set the next_local field of the previous table reference to 'ptr'. Here we also add one element to the list 'table_list'. */ table_list.link_in_list((byte*) ptr, (byte**) &ptr->next_local); ptr->next_name_resolution_table= NULL; /* Link table in global list (all used tables) */ lex->add_to_query_tables(ptr); DBUG_RETURN(ptr); } /* Initialize a new table list for a nested join SYNOPSIS init_nested_join() thd current thread DESCRIPTION The function initializes a structure of the TABLE_LIST type for a nested join. It sets up its nested join list as empty. The created structure is added to the front of the current join list in the st_select_lex object. Then the function changes the current nest level for joins to refer to the newly created empty list after having saved the info on the old level in the initialized structure. RETURN VALUE 0, if success 1, otherwise */ bool st_select_lex::init_nested_join(THD *thd) { TABLE_LIST *ptr; NESTED_JOIN *nested_join; DBUG_ENTER("init_nested_join"); if (!(ptr= (TABLE_LIST*) thd->calloc(ALIGN_SIZE(sizeof(TABLE_LIST))+ sizeof(NESTED_JOIN)))) DBUG_RETURN(1); nested_join= ptr->nested_join= ((NESTED_JOIN*) ((byte*) ptr + ALIGN_SIZE(sizeof(TABLE_LIST)))); join_list->push_front(ptr); ptr->embedding= embedding; ptr->join_list= join_list; embedding= ptr; join_list= &nested_join->join_list; join_list->empty(); DBUG_RETURN(0); } /* End a nested join table list SYNOPSIS end_nested_join() thd current thread DESCRIPTION The function returns to the previous join nest level. If the current level contains only one member, the function moves it one level up, eliminating the nest. RETURN VALUE Pointer to TABLE_LIST element added to the total table list, if success 0, otherwise */ TABLE_LIST *st_select_lex::end_nested_join(THD *thd) { TABLE_LIST *ptr; NESTED_JOIN *nested_join; DBUG_ENTER("end_nested_join"); DBUG_ASSERT(embedding); ptr= embedding; join_list= ptr->join_list; embedding= ptr->embedding; nested_join= ptr->nested_join; if (nested_join->join_list.elements == 1) { TABLE_LIST *embedded= nested_join->join_list.head(); join_list->pop(); embedded->join_list= join_list; embedded->embedding= embedding; join_list->push_front(embedded); ptr= embedded; } else if (nested_join->join_list.elements == 0) { join_list->pop(); ptr= 0; // return value } DBUG_RETURN(ptr); } /* Nest last join operation SYNOPSIS nest_last_join() thd current thread DESCRIPTION The function nest last join operation as if it was enclosed in braces. RETURN VALUE 0 Error # Pointer to TABLE_LIST element created for the new nested join */ TABLE_LIST *st_select_lex::nest_last_join(THD *thd) { TABLE_LIST *ptr; NESTED_JOIN *nested_join; List<TABLE_LIST> *embedded_list; DBUG_ENTER("nest_last_join"); if (!(ptr= (TABLE_LIST*) thd->calloc(ALIGN_SIZE(sizeof(TABLE_LIST))+ sizeof(NESTED_JOIN)))) DBUG_RETURN(0); nested_join= ptr->nested_join= ((NESTED_JOIN*) ((byte*) ptr + ALIGN_SIZE(sizeof(TABLE_LIST)))); ptr->embedding= embedding; ptr->join_list= join_list; embedded_list= &nested_join->join_list; embedded_list->empty(); for (uint i=0; i < 2; i++) { TABLE_LIST *table= join_list->pop(); table->join_list= embedded_list; table->embedding= ptr; embedded_list->push_back(table); if (table->natural_join) { ptr->is_natural_join= TRUE; /* If this is a JOIN ... USING, move the list of joined fields to the table reference that describes the join. */ if (prev_join_using) ptr->join_using_fields= prev_join_using; } } join_list->push_front(ptr); nested_join->used_tables= nested_join->not_null_tables= (table_map) 0; DBUG_RETURN(ptr); } /* Add a table to the current join list SYNOPSIS add_joined_table() table the table to add DESCRIPTION The function puts a table in front of the current join list of st_select_lex object. Thus, joined tables are put into this list in the reverse order (the most outer join operation follows first). RETURN VALUE None */ void st_select_lex::add_joined_table(TABLE_LIST *table) { DBUG_ENTER("add_joined_table"); join_list->push_front(table); table->join_list= join_list; table->embedding= embedding; DBUG_VOID_RETURN; } /* Convert a right join into equivalent left join SYNOPSIS convert_right_join() thd current thread DESCRIPTION The function takes the current join list t[0],t[1] ... and effectively converts it into the list t[1],t[0] ... Although the outer_join flag for the new nested table contains JOIN_TYPE_RIGHT, it will be handled as the inner table of a left join operation. EXAMPLES SELECT * FROM t1 RIGHT JOIN t2 ON on_expr => SELECT * FROM t2 LEFT JOIN t1 ON on_expr SELECT * FROM t1,t2 RIGHT JOIN t3 ON on_expr => SELECT * FROM t1,t3 LEFT JOIN t2 ON on_expr SELECT * FROM t1,t2 RIGHT JOIN (t3,t4) ON on_expr => SELECT * FROM t1,(t3,t4) LEFT JOIN t2 ON on_expr SELECT * FROM t1 LEFT JOIN t2 ON on_expr1 RIGHT JOIN t3 ON on_expr2 => SELECT * FROM t3 LEFT JOIN (t1 LEFT JOIN t2 ON on_expr2) ON on_expr1 RETURN Pointer to the table representing the inner table, if success 0, otherwise */ TABLE_LIST *st_select_lex::convert_right_join() { TABLE_LIST *tab2= join_list->pop(); TABLE_LIST *tab1= join_list->pop(); DBUG_ENTER("convert_right_join"); join_list->push_front(tab2); join_list->push_front(tab1); tab1->outer_join|= JOIN_TYPE_RIGHT; DBUG_RETURN(tab1); } /* 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_local) { tables->lock_type= lock_type; tables->updating= for_update; } DBUG_VOID_RETURN; } /* Create a fake SELECT_LEX for a unit SYNOPSIS: add_fake_select_lex() thd thread handle DESCRIPTION The method create a fake SELECT_LEX object for a unit. This object is created for any union construct containing a union operation and also for any single select union construct of the form (SELECT ... ORDER BY order_list [LIMIT n]) ORDER BY ... or of the form (SELECT ... ORDER BY LIMIT n) ORDER BY ... NOTES The object is used to retrieve rows from the temporary table where the result on the union is obtained. RETURN VALUES 1 on failure to create the object 0 on success */ bool st_select_lex_unit::add_fake_select_lex(THD *thd_arg) { SELECT_LEX *first_sl= first_select(); DBUG_ENTER("add_fake_select_lex"); DBUG_ASSERT(!fake_select_lex); if (!(fake_select_lex= new (thd_arg->mem_root) SELECT_LEX())) DBUG_RETURN(1); fake_select_lex->include_standalone(this, (SELECT_LEX_NODE**)&fake_select_lex); fake_select_lex->select_number= INT_MAX; fake_select_lex->parent_lex= thd_arg->lex; /* Used in init_query. */ fake_select_lex->make_empty_select(); fake_select_lex->linkage= GLOBAL_OPTIONS_TYPE; fake_select_lex->select_limit= 0; fake_select_lex->context.outer_context=first_sl->context.outer_context; /* allow item list resolving in fake select for ORDER BY */ fake_select_lex->context.resolve_in_select_list= TRUE; fake_select_lex->context.select_lex= fake_select_lex; if (!first_sl->next_select()) { /* This works only for (SELECT ... ORDER BY list [LIMIT n]) ORDER BY order_list [LIMIT m], (SELECT ... LIMIT n) ORDER BY order_list [LIMIT m] just before the parser starts processing order_list */ global_parameters= fake_select_lex; fake_select_lex->no_table_names_allowed= 1; thd_arg->lex->current_select= fake_select_lex; } thd_arg->lex->pop_context(); DBUG_RETURN(0); } /* Push a new name resolution context for a JOIN ... ON clause to the context stack of a query block. SYNOPSIS push_new_name_resolution_context() thd pointer to current thread left_op left operand of the JOIN right_op rigth operand of the JOIN DESCRIPTION Create a new name resolution context for a JOIN ... ON clause, set the first and last leaves of the list of table references to be used for name resolution, and push the newly created context to the stack of contexts of the query. RETURN FALSE if all is OK TRUE if a memory allocation error occured */ bool push_new_name_resolution_context(THD *thd, TABLE_LIST *left_op, TABLE_LIST *right_op) { Name_resolution_context *on_context; if (!(on_context= new (thd->mem_root) Name_resolution_context)) return TRUE; on_context->init(); on_context->first_name_resolution_table= left_op->first_leaf_for_name_resolution(); on_context->last_name_resolution_table= right_op->last_leaf_for_name_resolution(); return thd->lex->push_context(on_context); } /* Add an ON condition to the second operand of a JOIN ... ON. SYNOPSIS add_join_on b the second operand of a JOIN ... ON expr the condition to be added to the ON clause DESCRIPTION Add an ON condition to the right operand of a JOIN ... ON clause. RETURN FALSE if there was some error TRUE if all is OK */ void add_join_on(TABLE_LIST *b, Item *expr) { if (expr) { if (!b->on_expr) b->on_expr= expr; else { /* If called from the parser, this happens if you have both a right and left join. If called later, it happens if we add more than one condition to the ON clause. */ b->on_expr= new Item_cond_and(b->on_expr,expr); } b->on_expr->top_level_item(); } } /* Mark that there is a NATURAL JOIN or JOIN ... USING between two tables. SYNOPSIS add_join_natural() a Left join argument b Right join argument using_fields Field names from USING clause lex The current st_select_lex IMPLEMENTATION This function marks that table b should be joined with a either via a NATURAL JOIN or via JOIN ... USING. Both join types are special cases of each other, so we treat them together. The function setup_conds() creates a list of equal condition between all fields of the same name for NATURAL JOIN or the fields in 'using_fields' for JOIN ... USING. The list of equality conditions is stored either in b->on_expr, or in JOIN::conds, depending on whether there was an outer join. EXAMPLE SELECT * FROM t1 NATURAL LEFT JOIN t2 <=> SELECT * FROM t1 LEFT JOIN t2 ON (t1.i=t2.i and t1.j=t2.j ... ) SELECT * FROM t1 NATURAL JOIN t2 WHERE <some_cond> <=> SELECT * FROM t1, t2 WHERE (t1.i=t2.i and t1.j=t2.j and <some_cond>) SELECT * FROM t1 JOIN t2 USING(j) WHERE <some_cond> <=> SELECT * FROM t1, t2 WHERE (t1.j=t2.j and <some_cond>) RETURN None */ void add_join_natural(TABLE_LIST *a, TABLE_LIST *b, List<String> *using_fields, SELECT_LEX *lex) { b->natural_join= a; lex->prev_join_using= using_fields; } /* Reload/resets privileges and the different caches. SYNOPSIS reload_acl_and_cache() thd Thread handler (can be NULL!) 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 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. thd->killed or thd->net.report_error is set */ 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; DBUG_ASSERT(!thd || !thd->in_sub_stmt); #ifndef NO_EMBEDDED_ACCESS_CHECKS if (options & REFRESH_GRANT) { THD *tmp_thd= 0; /* If reload_acl_and_cache() is called from SIGHUP handler we have to allocate temporary THD for execution of acl_reload()/grant_reload(). */ if (!thd && (thd= (tmp_thd= new THD))) { thd->thread_stack= (char*) &tmp_thd; thd->store_globals(); } if (thd) { (void)acl_reload(thd); (void)grant_reload(thd); } if (tmp_thd) { delete tmp_thd; /* Remember that we don't have a THD */ my_pthread_setspecific_ptr(THR_THD, 0); thd= 0; } reset_mqh((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_slow_log.new_file(1); if( mysql_bin_log.is_open() ) { mysql_bin_log.rotate_and_purge(RP_FORCE_ROTATE); } #ifdef HAVE_REPLICATION 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 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) { /* We must not try to aspire a global read lock if we have a write locked table. This would lead to a deadlock when trying to reopen (and re-lock) the table after the flush. */ if (thd->locked_tables) { THR_LOCK_DATA **lock_p= thd->locked_tables->locks; THR_LOCK_DATA **end_p= lock_p + thd->locked_tables->lock_count; for (; lock_p < end_p; lock_p++) { if ((*lock_p)->type == TL_WRITE) { my_error(ER_LOCK_OR_ACTIVE_TRANSACTION, MYF(0)); return 1; } } } /* 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; // Killed result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1, tables); if (make_global_read_lock_block_commit(thd)) // Killed { /* Don't leave things in a half-locked state */ unlock_global_read_lock(thd); return 1; } } else result=close_cached_tables(thd,(options & REFRESH_FAST) ? 0 : 1, tables); my_dbopt_cleanup(); } if (options & REFRESH_HOSTS) hostname_cache_refresh(); if (thd && (options & REFRESH_STATUS)) refresh_status(thd); if (options & REFRESH_THREADS) flush_thread_cache(); #ifdef HAVE_REPLICATION if (options & REFRESH_MASTER) { DBUG_ASSERT(thd); tmp_write_to_binlog= 0; if (reset_master(thd)) { result=1; thd->fatal_error(); // Ensure client get error } } #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((LEX_USER *) NULL); *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, bool only_kill_query) { 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->security_ctx->master_access & SUPER_ACL) || !strcmp(thd->security_ctx->user, tmp->security_ctx->user)) { tmp->awake(only_kill_query ? THD::KILL_QUERY : THD::KILL_CONNECTION); error=0; } else error=ER_KILL_DENIED_ERROR; pthread_mutex_unlock(&tmp->LOCK_delete); } if (!error) send_ok(thd); else my_error(error, MYF(0), id); } /* 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; LEX *lex= thd->lex; if (lex->current_select != &lex->select_lex) { char command[80]; strmake(command, lex->yylval->symbol.str, min(lex->yylval->symbol.length, sizeof(command)-1)); my_error(ER_CANT_USE_OPTION_HERE, MYF(0), 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 *)<_creator:(Comp_creator *)&ge_creator; } Comp_creator *comp_gt_creator(bool invert) { return invert?(Comp_creator *)&le_creator:(Comp_creator *)>_creator; } Comp_creator *comp_le_creator(bool invert) { return invert?(Comp_creator *)>_creator:(Comp_creator *)&le_creator; } Comp_creator *comp_lt_creator(bool invert) { return invert?(Comp_creator *)&ge_creator:(Comp_creator *)<_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, select_lex, all); if (all) return it->upper_item= new Item_func_not_all(it); /* ALL */ return it->upper_item= new Item_func_nop_all(it); /* ANY/SOME */ } /* Multi update query pre-check SYNOPSIS multi_update_precheck() thd Thread handler tables Global/local table list (have to be the same) RETURN VALUE FALSE OK TRUE Error */ bool multi_update_precheck(THD *thd, TABLE_LIST *tables) { const char *msg= 0; TABLE_LIST *table; LEX *lex= thd->lex; SELECT_LEX *select_lex= &lex->select_lex; DBUG_ENTER("multi_update_precheck"); if (select_lex->item_list.elements != lex->value_list.elements) { my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0)); DBUG_RETURN(TRUE); } /* Ensure that we have UPDATE or SELECT privilege for each table The exact privilege is checked in mysql_multi_update() */ for (table= tables; table; table= table->next_local) { if (table->derived) table->grant.privilege= SELECT_ACL; else if ((check_access(thd, UPDATE_ACL, table->db, &table->grant.privilege, 0, 1, test(table->schema_table)) || grant_option && check_grant(thd, UPDATE_ACL, table, 0, 1, 1)) && (check_access(thd, SELECT_ACL, table->db, &table->grant.privilege, 0, 0, test(table->schema_table)) || grant_option && check_grant(thd, SELECT_ACL, table, 0, 1, 0))) DBUG_RETURN(TRUE); table->table_in_first_from_clause= 1; } /* Is there tables of subqueries? */ if (&lex->select_lex != lex->all_selects_list || lex->time_zone_tables_used) { DBUG_PRINT("info",("Checking sub query list")); for (table= tables; table; table= table->next_global) { if (!my_tz_check_n_skip_implicit_tables(&table, lex->time_zone_tables_used) && !table->table_in_first_from_clause) { if (check_access(thd, SELECT_ACL, table->db, &table->grant.privilege, 0, 0, test(table->schema_table)) || grant_option && check_grant(thd, SELECT_ACL, table, 0, 1, 0)) DBUG_RETURN(TRUE); } } } if (select_lex->order_list.elements) msg= "ORDER BY"; else if (select_lex->select_limit) msg= "LIMIT"; if (msg) { my_error(ER_WRONG_USAGE, MYF(0), "UPDATE", msg); DBUG_RETURN(TRUE); } DBUG_RETURN(FALSE); } /* Multi delete query pre-check SYNOPSIS multi_delete_precheck() thd Thread handler tables Global/local table list RETURN VALUE FALSE OK TRUE error */ bool multi_delete_precheck(THD *thd, TABLE_LIST *tables) { SELECT_LEX *select_lex= &thd->lex->select_lex; TABLE_LIST *aux_tables= (TABLE_LIST *)thd->lex->auxiliary_table_list.first; TABLE_LIST **save_query_tables_own_last= thd->lex->query_tables_own_last; DBUG_ENTER("multi_delete_precheck"); /* 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)) DBUG_RETURN(TRUE); /* Since aux_tables list is not part of LEX::query_tables list we have to juggle with LEX::query_tables_own_last value to be able call check_table_access() safely. */ thd->lex->query_tables_own_last= 0; if (check_table_access(thd, DELETE_ACL, aux_tables, 0)) { thd->lex->query_tables_own_last= save_query_tables_own_last; DBUG_RETURN(TRUE); } thd->lex->query_tables_own_last= save_query_tables_own_last; if ((thd->options & OPTION_SAFE_UPDATES) && !select_lex->where) { my_message(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE, ER(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE), MYF(0)); DBUG_RETURN(TRUE); } DBUG_RETURN(FALSE); } /* Link tables in auxilary table list of multi-delete with corresponding elements in main table list, and set proper locks for them. SYNOPSIS multi_delete_set_locks_and_link_aux_tables() lex - pointer to LEX representing multi-delete RETURN VALUE FALSE - success TRUE - error */ bool multi_delete_set_locks_and_link_aux_tables(LEX *lex) { TABLE_LIST *tables= (TABLE_LIST*)lex->select_lex.table_list.first; TABLE_LIST *target_tbl; DBUG_ENTER("multi_delete_set_locks_and_link_aux_tables"); lex->table_count= 0; for (target_tbl= (TABLE_LIST *)lex->auxiliary_table_list.first; target_tbl; target_tbl= target_tbl->next_local) { lex->table_count++; /* All tables in aux_tables must be found in FROM PART */ TABLE_LIST *walk; for (walk= tables; walk; walk= walk->next_local) { 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->table_name, "MULTI DELETE"); DBUG_RETURN(TRUE); } if (!walk->derived) { target_tbl->table_name= walk->table_name; target_tbl->table_name_length= walk->table_name_length; } walk->updating= target_tbl->updating; walk->lock_type= target_tbl->lock_type; target_tbl->correspondent_table= walk; // Remember corresponding table } DBUG_RETURN(FALSE); } /* simple UPDATE query pre-check SYNOPSIS update_precheck() thd Thread handler tables Global table list RETURN VALUE FALSE OK TRUE Error */ bool 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_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0)); DBUG_RETURN(TRUE); } DBUG_RETURN(check_db_used(thd, tables) || check_one_table_access(thd, UPDATE_ACL, tables)); } /* simple DELETE query pre-check SYNOPSIS delete_precheck() thd Thread handler tables Global table list RETURN VALUE FALSE OK TRUE error */ bool delete_precheck(THD *thd, TABLE_LIST *tables) { DBUG_ENTER("delete_precheck"); if (check_one_table_access(thd, DELETE_ACL, tables)) DBUG_RETURN(TRUE); /* Set privilege for the WHERE clause */ tables->grant.want_privilege=(SELECT_ACL & ~tables->grant.privilege); DBUG_RETURN(FALSE); } /* simple INSERT query pre-check SYNOPSIS insert_precheck() thd Thread handler tables Global table list RETURN VALUE FALSE OK TRUE error */ bool insert_precheck(THD *thd, TABLE_LIST *tables) { LEX *lex= thd->lex; DBUG_ENTER("insert_precheck"); /* Check that we have modify privileges for the first table and select privileges for the rest */ ulong privilege= (INSERT_ACL | (lex->duplicates == DUP_REPLACE ? DELETE_ACL : 0) | (lex->value_list.elements ? UPDATE_ACL : 0)); if (check_one_table_access(thd, privilege, tables)) DBUG_RETURN(TRUE); if (lex->update_list.elements != lex->value_list.elements) { my_message(ER_WRONG_VALUE_COUNT, ER(ER_WRONG_VALUE_COUNT), MYF(0)); DBUG_RETURN(TRUE); } if (check_db_used(thd, tables)) DBUG_RETURN(TRUE); DBUG_RETURN(FALSE); } /* 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 FALSE OK TRUE Error */ bool create_table_precheck(THD *thd, TABLE_LIST *tables, TABLE_LIST *create_table) { LEX *lex= thd->lex; SELECT_LEX *select_lex= &lex->select_lex; ulong want_priv; bool error= TRUE; // Error message is given DBUG_ENTER("create_table_precheck"); want_priv= ((lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) ? CREATE_TMP_ACL : CREATE_ACL); if (check_access(thd, want_priv, create_table->db, &create_table->grant.privilege, 0, 0, test(create_table->schema_table)) || check_merge_table_access(thd, create_table->db, (TABLE_LIST *) lex->create_info.merge_list.first)) goto err; if (grant_option && want_priv != CREATE_TMP_ACL && check_grant(thd, want_priv, create_table, 0, 1, 0)) goto err; if (select_lex->item_list.elements) { /* Check permissions for used tables in CREATE TABLE ... SELECT */ #ifdef NOT_NECESSARY_TO_CHECK_CREATE_TABLE_EXIST_WHEN_PREPARING_STATEMENT /* This code throws an ill error for CREATE TABLE t1 SELECT * FROM t1 */ /* Only do the check for PS, becasue we on execute we have to check that against the opened tables to ensure we don't use a table that is part of the view (which can only be done after the table has been opened). */ if (thd->stmt_arena->is_stmt_prepare_or_first_sp_execute()) { /* For temporary tables we don't have to check if the created table exists */ if (!(lex->create_info.options & HA_LEX_CREATE_TMP_TABLE) && find_table_in_global_list(tables, create_table->db, create_table->table_name)) { error= FALSE; goto err; } } #endif if (tables && check_table_access(thd, SELECT_ACL, tables,0)) goto err; } error= FALSE; err: DBUG_RETURN(error); } /* negate given expression SYNOPSIS negate_expression() thd thread 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); } /* Set the specified definer to the default value, which is the current user in the thread. SYNOPSIS get_default_definer() thd [in] thread handler definer [out] definer */ void get_default_definer(THD *thd, LEX_USER *definer) { const Security_context *sctx= thd->security_ctx; definer->user.str= (char *) sctx->priv_user; definer->user.length= strlen(definer->user.str); definer->host.str= (char *) sctx->priv_host; definer->host.length= strlen(definer->host.str); } /* Create default definer for the specified THD. SYNOPSIS create_default_definer() thd [in] thread handler RETURN On success, return a valid pointer to the created and initialized LEX_USER, which contains definer information. On error, return 0. */ LEX_USER *create_default_definer(THD *thd) { LEX_USER *definer; if (! (definer= (LEX_USER*) thd->alloc(sizeof(LEX_USER)))) return 0; get_default_definer(thd, definer); return definer; } /* Create definer with the given user and host names. SYNOPSIS create_definer() thd [in] thread handler user_name [in] user name host_name [in] host name RETURN On success, return a valid pointer to the created and initialized LEX_USER, which contains definer information. On error, return 0. */ LEX_USER *create_definer(THD *thd, LEX_STRING *user_name, LEX_STRING *host_name) { LEX_USER *definer; /* Create and initialize. */ if (! (definer= (LEX_USER*) thd->alloc(sizeof(LEX_USER)))) return 0; definer->user= *user_name; definer->host= *host_name; return definer; } /* Retuns information about user or current user. SYNOPSIS get_current_user() thd [in] thread handler user [in] user RETURN On success, return a valid pointer to initialized LEX_USER, which contains user information. On error, return 0. */ LEX_USER *get_current_user(THD *thd, LEX_USER *user) { if (!user->user.str) // current_user return create_default_definer(thd); return user; } /* Check that length of a string does not exceed some limit. SYNOPSIS check_string_length() str string to be checked err_msg error message to be displayed if the string is too long max_length max length RETURN FALSE the passed string is not longer than max_length TRUE the passed string is longer than max_length */ bool check_string_length(LEX_STRING *str, const char *err_msg, uint max_length) { if (str->length <= max_length) return FALSE; my_error(ER_WRONG_STRING_LENGTH, MYF(0), str->str, err_msg, max_length); return TRUE; }