/* * GNU General Public License as published by the Free Software Foundation, * version 2. * * 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., 51 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * * Copyright MariaDB Corporation Ab 2014-2015 */ /** * @file blr_slave.c - contains code for the router to slave communication * * The binlog router is designed to be used in replication environments to * increase the replication fanout of a master server. It provides a transparant * mechanism to read the binlog entries for multiple slaves while requiring * only a single connection to the actual master to support the slaves. * * The current prototype implement is designed to support MySQL 5.6 and has * a number of limitations. This prototype is merely a proof of concept and * should not be considered production ready. * * @verbatim * Revision History * * Date Who Description * 14/04/2014 Mark Riddoch Initial implementation * 18/02/2015 Massimiliano Pinto Addition of DISCONNECT ALL and DISCONNECT SERVER server_id * 18/03/2015 Markus Makela Better detection of CRC32 | NONE checksum * 19/03/2015 Massimiliano Pinto Addition of basic MariaDB 10 compatibility support * 07/05/2015 Massimiliano Pinto Added MariaDB 10 Compatibility * 11/05/2015 Massimiliano Pinto Only MariaDB 10 Slaves can register to binlog router * with a MariaDB 10 Master * 25/05/2015 Massimiliano Pinto Addition of BLRM_SLAVE_STOPPED state and blr_start/stop_slave. * New commands STOP SLAVE, START SLAVE added. * 29/05/2015 Massimiliano Pinto Addition of CHANGE MASTER TO ... * 05/06/2015 Massimiliano Pinto router->service->dbref->sever->name instead of master->remote * in blr_slave_send_slave_status() * 08/06/2015 Massimiliano Pinto blr_slave_send_slave_status() shows mysql_errno and error_msg * 15/06/2015 Massimiliano Pinto Added constraints to CHANGE MASTER TO MASTER_LOG_FILE/POS * 23/06/2015 Massimiliano Pinto Added utility routines for blr_handle_change_master * Call create/use binlog in blr_start_slave() (START SLAVE) * 29/06/2015 Massimiliano Pinto Successfully CHANGE MASTER results in updating master.ini * in blr_handle_change_master() * 20/08/2015 Massimiliano Pinto Added parsing and validation for CHANGE MASTER TO * 21/08/2015 Massimiliano Pinto Added support for new config options: * master_uuid, master_hostname, master_version * If set those values are sent to slaves instead of * saved master responses * 03/09/2015 Massimiliano Pinto Added support for SHOW [GLOBAL] VARIABLES LIKE * 04/09/2015 Massimiliano Pinto Added support for SHOW WARNINGS * 15/09/2015 Massimiliano Pinto Added support for SHOW [GLOBAL] STATUS LIKE 'Uptime' * 25/09/2015 Massimiliano Pinto Addition of slave heartbeat: * the period set during registration is checked * and heartbeat event might be sent to the affected slave. * 25/09/2015 Martin Brampton Block callback processing when no router session in the DCB * 23/10/15 Markus Makela Added current_safe_event * * @endverbatim */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include extern int load_mysql_users(SERVICE *service); extern int blr_save_dbusers(ROUTER_INSTANCE *router); extern void blr_master_close(ROUTER_INSTANCE* router); extern void blr_file_use_binlog(ROUTER_INSTANCE *router, char *file); extern int blr_file_new_binlog(ROUTER_INSTANCE *router, char *file); extern int blr_file_write_master_config(ROUTER_INSTANCE *router, char *error); extern char *blr_extract_column(GWBUF *buf, int col); extern uint32_t extract_field(uint8_t *src, int bits); int blr_file_get_next_binlogname(ROUTER_INSTANCE *router); static void encode_value(unsigned char *data, unsigned int value, int len); static int blr_slave_query(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, GWBUF *queue); static int blr_slave_replay(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, GWBUF *master); static void blr_slave_send_error(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, char *msg); static int blr_slave_send_timestamp(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave); static int blr_slave_register(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, GWBUF *queue); static int blr_slave_binlog_dump(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, GWBUF *queue); int blr_slave_catchup(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, bool large); uint8_t *blr_build_header(GWBUF *pkt, REP_HEADER *hdr); int blr_slave_callback(DCB *dcb, DCB_REASON reason, void *data); static int blr_slave_fake_rotate(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, BLFILE** filep); static void blr_slave_send_fde(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave); static int blr_slave_send_maxscale_version(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave); static int blr_slave_send_server_id(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave); static int blr_slave_send_maxscale_variables(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave); static int blr_slave_send_master_status(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave); static int blr_slave_send_slave_status(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave); static int blr_slave_send_slave_hosts(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave); static int blr_slave_send_fieldcount(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, int count); static int blr_slave_send_columndef(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, char *name, int type, int len, uint8_t seqno); static int blr_slave_send_eof(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, int seqno); static int blr_slave_send_disconnected_server(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, int server_id, int found); static int blr_slave_disconnect_all(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave); static int blr_slave_disconnect_server(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, int server_id); static int blr_slave_send_ok(ROUTER_INSTANCE* router, ROUTER_SLAVE* slave); static int blr_stop_slave(ROUTER_INSTANCE* router, ROUTER_SLAVE* slave); static int blr_start_slave(ROUTER_INSTANCE* router, ROUTER_SLAVE* slave); static void blr_slave_send_error_packet(ROUTER_SLAVE *slave, char *msg, unsigned int err_num, char *status); static int blr_handle_change_master(ROUTER_INSTANCE* router, char *command, char *error); static int blr_set_master_hostname(ROUTER_INSTANCE *router, char *hostname); static int blr_set_master_port(ROUTER_INSTANCE *router, char *command); static char *blr_set_master_logfile(ROUTER_INSTANCE *router, char *filename, char *error); static void blr_master_get_config(ROUTER_INSTANCE *router, MASTER_SERVER_CFG *current_master); static void blr_master_free_config(MASTER_SERVER_CFG *current_master); static void blr_master_restore_config(ROUTER_INSTANCE *router, MASTER_SERVER_CFG *current_master); static void blr_master_set_empty_config(ROUTER_INSTANCE *router); static void blr_master_apply_config(ROUTER_INSTANCE *router, MASTER_SERVER_CFG *prev_master); static int blr_slave_send_ok_message(ROUTER_INSTANCE* router, ROUTER_SLAVE* slave, char *message); static char *blr_get_parsed_command_value(char *input); static char **blr_validate_change_master_option(char *option, CHANGE_MASTER_OPTIONS *config); static int blr_set_master_user(ROUTER_INSTANCE *router, char *user); static int blr_set_master_password(ROUTER_INSTANCE *router, char *password); static int blr_parse_change_master_command(char *input, char *error_string, CHANGE_MASTER_OPTIONS *config); static int blr_handle_change_master_token(char *input, char *error, CHANGE_MASTER_OPTIONS *config); static void blr_master_free_parsed_options(CHANGE_MASTER_OPTIONS *options); static int blr_slave_send_var_value(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, char *variable, char *value, int column_type); static int blr_slave_send_variable(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, char *variable, char *value, int column_type); static int blr_slave_send_columndef_with_info_schema(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, char *name, int type, int len, uint8_t seqno); int blr_test_parse_change_master_command(char *input, char *error_string, CHANGE_MASTER_OPTIONS *config); char *blr_test_set_master_logfile(ROUTER_INSTANCE *router, char *filename, char *error); static int blr_slave_handle_variables(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, char *stmt); static int blr_slave_send_warning_message(ROUTER_INSTANCE* router, ROUTER_SLAVE* slave, char *message); static int blr_slave_show_warnings(ROUTER_INSTANCE* router, ROUTER_SLAVE* slave); extern int maxscale_uptime(); static int blr_slave_send_status_variable(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, char *variable, char *value, int column_type); static int blr_slave_handle_status_variables(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, char *stmt); static int blr_slave_send_columndef_with_status_schema(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, char *name, int type, int len, uint8_t seqno); static void blr_send_slave_heartbeat(void *inst); static int blr_slave_send_heartbeat(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave); void poll_fake_write_event(DCB *dcb); /** * Process a request packet from the slave server. * * The router can handle a limited subset of requests from the slave, these * include a subset of general SQL queries, a slave registeration command and * the binlog dump command. * * The strategy for responding to these commands is to use caches responses * for the the same commands that have previously been made to the real master * if this is possible, if it is not then the router itself will synthesize a * response. * * @param router The router instance this defines the master for this replication chain * @param slave The slave specific data * @param queue The incoming request packet */ int blr_slave_request(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, GWBUF *queue) { if (slave->state < 0 || slave->state > BLRS_MAXSTATE) { MXS_ERROR("Invalid slave state machine state (%d) for binlog router.", slave->state); gwbuf_consume(queue, gwbuf_length(queue)); return 0; } slave->stats.n_requests++; switch (MYSQL_COMMAND(queue)) { case COM_QUERY: slave->stats.n_queries++; return blr_slave_query(router, slave, queue); break; case COM_REGISTER_SLAVE: if (router->master_state == BLRM_UNCONFIGURED) { slave->state = BLRS_ERRORED; blr_slave_send_error_packet(slave, "Binlog router is not yet configured for replication", (unsigned int) 1597, NULL); MXS_ERROR("%s: Slave %s: Binlog router is not yet configured for replication", router->service->name, slave->dcb->remote); dcb_close(slave->dcb); return 1; } /* * If Master is MariaDB10 don't allow registration from * MariaDB/Mysql 5 Slaves */ if (router->mariadb10_compat && !slave->mariadb10_compat) { slave->state = BLRS_ERRORED; blr_send_custom_error(slave->dcb, 1, 0, "MariaDB 10 Slave is required for Slave registration", "42000", 1064); MXS_ERROR("%s: Slave %s: a MariaDB 10 Slave is required for Slave registration", router->service->name, slave->dcb->remote); dcb_close(slave->dcb); return 1; } else { /* Master and Slave version OK: continue with slave registration */ return blr_slave_register(router, slave, queue); } break; case COM_BINLOG_DUMP: { char task_name[BLRM_TASK_NAME_LEN + 1] = ""; int rc = 0; rc = blr_slave_binlog_dump(router, slave, queue); if (router->send_slave_heartbeat && rc && slave->heartbeat > 0) { snprintf(task_name, BLRM_TASK_NAME_LEN, "%s slaves heartbeat send", router->service->name); /* Add slave heartbeat check task: it runs with 1 second frequency */ hktask_add(task_name, blr_send_slave_heartbeat, router, 1); } return rc; } break; case COM_STATISTICS: return blr_statistics(router, slave, queue); break; case COM_PING: return blr_ping(router, slave, queue); break; case COM_QUIT: MXS_DEBUG("COM_QUIT received from slave with server_id %d", slave->serverid); break; default: blr_send_custom_error(slave->dcb, 1, 0, "You have an error in your SQL syntax; Check the " "syntax the MaxScale binlog router accepts.", "42000", 1064); MXS_ERROR("Unexpected MySQL Command (%d) received from slave", MYSQL_COMMAND(queue)); break; } return 0; } /** * Handle a query from the slave. This is expected to be one of the "standard" * queries we expect as part of the registraton process. Most of these can * be dealt with by replying the stored responses we got from the master * when MaxScale registered as a slave. The exception to the rule is the * request to obtain the current timestamp value of the server. * * The original set added for the registration process has been enhanced in * order to support some commands that are useful for monitoring the binlog * router. * * Twelve select statements are currently supported: * SELECT UNIX_TIMESTAMP(); * SELECT @master_binlog_checksum * SELECT @@GLOBAL.GTID_MODE * SELECT VERSION() * SELECT 1 * SELECT @@version_comment limit 1 * SELECT @@hostname * SELECT @@max_allowed_packet * SELECT @@maxscale_version * SELECT @@[GLOBAL.]server_id * SELECT @@version * SELECT @@[GLOBAL.]server_uuid * * Eight show commands are supported: * SHOW [GLOBAL] VARIABLES LIKE 'SERVER_ID' * SHOW [GLOBAL] VARIABLES LIKE 'SERVER_UUID' * SHOW [GLOBAL] VARIABLES LIKE 'MAXSCALE%' * SHOW SLAVE STATUS * SHOW MASTER STATUS * SHOW SLAVE HOSTS * SHOW WARNINGS * SHOW [GLOBAL] STATUS LIKE 'Uptime' * * Six set commands are supported: * SET @master_binlog_checksum = @@global.binlog_checksum * SET @master_heartbeat_period=... * SET @slave_slave_uuid=... * SET NAMES latin1 * SET NAMES utf8 * SET mariadb_slave_capability=... * * Four administrative commands are supported: * STOP SLAVE * START SLAVE * CHANGE MASTER TO * RESET SLAVE * * @param router The router instance this defines the master for this replication chain * @param slave The slave specific data * @param queue The incoming request packet * @return Non-zero if data has been sent */ static int blr_slave_query(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, GWBUF *queue) { char *qtext, *query_text; char *sep = " ,="; char *word, *brkb; int query_len; char *ptr; extern char *strcasestr(); qtext = GWBUF_DATA(queue); query_len = extract_field((uint8_t *)qtext, 24) - 1; qtext += 5; // Skip header and first byte of the payload query_text = strndup(qtext, query_len); /* Don't log the full statement containg 'password', just trucate it */ ptr = strcasestr(query_text, "password"); if (ptr != NULL) { char *new_text = strdup(query_text); int trucate_at = (ptr - query_text); if (trucate_at > 0) { if ( (trucate_at + 3) <= strlen(new_text)) { int i; for (i = 0; i < 3; i++) { new_text[trucate_at + i] = '.'; } new_text[trucate_at + 3] = '\0'; } else { new_text[trucate_at] = '\0'; } } MXS_INFO("Execute statement (truncated, it contains password)" " from the slave '%s'", new_text); free(new_text); } else { MXS_INFO("Execute statement from the slave '%s'", query_text); } /* * Implement a very rudimental "parsing" of the query text by extarcting the * words from the statement and matchng them against the subset of queries we * are expecting from the slave. We already have responses to these commands, * except for the select of UNIX_TIMESTAMP(), that we have saved from MaxScale's * own interaction with the real master. We simply replay these saved responses * to the slave. */ if ((word = strtok_r(query_text, sep, &brkb)) == NULL) { MXS_ERROR("%s: Incomplete query.", router->service->name); } else if (strcasecmp(word, "SELECT") == 0) { if ((word = strtok_r(NULL, sep, &brkb)) == NULL) { MXS_ERROR("%s: Incomplete select query.", router->service->name); } else if (strcasecmp(word, "UNIX_TIMESTAMP()") == 0) { free(query_text); return blr_slave_send_timestamp(router, slave); } else if (strcasecmp(word, "@master_binlog_checksum") == 0) { free(query_text); return blr_slave_replay(router, slave, router->saved_master.chksum2); } else if (strcasecmp(word, "@@GLOBAL.GTID_MODE") == 0) { free(query_text); return blr_slave_replay(router, slave, router->saved_master.gtid_mode); } else if (strcasecmp(word, "1") == 0) { free(query_text); return blr_slave_replay(router, slave, router->saved_master.select1); } else if (strcasecmp(word, "VERSION()") == 0) { free(query_text); if (router->set_master_version) { return blr_slave_send_var_value(router, slave, "VERSION()", router->set_master_version, BLR_TYPE_STRING); } else { return blr_slave_replay(router, slave, router->saved_master.selectver); } } else if (strcasecmp(word, "@@version") == 0) { free(query_text); if (router->set_master_version) { return blr_slave_send_var_value(router, slave, "@@version", router->set_master_version, BLR_TYPE_STRING); } else { char *version = blr_extract_column(router->saved_master.selectver, 1); blr_slave_send_var_value(router, slave, "@@version", version == NULL ? "" : version, BLR_TYPE_STRING); free(version); return 1; } } else if (strcasecmp(word, "@@version_comment") == 0) { free(query_text); if (!router->saved_master.selectvercom) /* This will allow mysql client to get in when @@version_comment is not available */ { return blr_slave_send_ok(router, slave); } else { return blr_slave_replay(router, slave, router->saved_master.selectvercom); } } else if (strcasecmp(word, "@@hostname") == 0) { free(query_text); if (router->set_master_hostname) { return blr_slave_send_var_value(router, slave, "@@hostname", router->set_master_hostname, BLR_TYPE_STRING); } else { return blr_slave_replay(router, slave, router->saved_master.selecthostname); } } else if ((strcasecmp(word, "@@server_uuid") == 0) || (strcasecmp(word, "@@global.server_uuid") == 0)) { char heading[40]; /* to ensure we match the case in query and response */ strcpy(heading, word); free(query_text); if (router->set_master_uuid) { return blr_slave_send_var_value(router, slave, heading, router->master_uuid, BLR_TYPE_STRING); } else { char *master_uuid = blr_extract_column(router->saved_master.uuid, 2); blr_slave_send_var_value(router, slave, heading, master_uuid == NULL ? "" : master_uuid, BLR_TYPE_STRING); free(master_uuid); return 1; } } else if (strcasecmp(word, "@@max_allowed_packet") == 0) { free(query_text); return blr_slave_replay(router, slave, router->saved_master.map); } else if (strcasecmp(word, "@@maxscale_version") == 0) { free(query_text); return blr_slave_send_maxscale_version(router, slave); } else if ((strcasecmp(word, "@@server_id") == 0) || (strcasecmp(word, "@@global.server_id") == 0)) { char server_id[40]; char heading[40]; /* to ensure we match the case in query and response */ sprintf(server_id, "%d", router->masterid); strcpy(heading, word); free(query_text); return blr_slave_send_var_value(router, slave, heading, server_id, BLR_TYPE_INT); } } else if (strcasecmp(word, "SHOW") == 0) { if ((word = strtok_r(NULL, sep, &brkb)) == NULL) { MXS_ERROR("%s: Incomplete show query.", router->service->name); } else if (strcasecmp(word, "WARNINGS") == 0) { free(query_text); return blr_slave_show_warnings(router, slave); } else if (strcasecmp(word, "GLOBAL") == 0) { if (router->master_state == BLRM_UNCONFIGURED) { free(query_text); return blr_slave_send_ok(router, slave); } if ((word = strtok_r(NULL, sep, &brkb)) == NULL) { MXS_ERROR("%s: Expected VARIABLES in SHOW GLOBAL", router->service->name); } else if (strcasecmp(word, "VARIABLES") == 0) { int rc = blr_slave_handle_variables(router, slave, brkb); /* if no var found, send empty result set */ if (rc == 0) { blr_slave_send_ok(router, slave); } if (rc >= 0) { free(query_text); return 1; } else MXS_ERROR("%s: Expected LIKE clause in SHOW GLOBAL VARIABLES.", router->service->name); } else if (strcasecmp(word, "STATUS") == 0) { int rc = blr_slave_handle_status_variables(router, slave, brkb); /* if no var found, send empty result set */ if (rc == 0) { blr_slave_send_ok(router, slave); } if (rc >= 0) { free(query_text); return 1; } else { MXS_ERROR("%s: Expected LIKE clause in SHOW GLOBAL STATUS.", router->service->name); } } } else if (strcasecmp(word, "VARIABLES") == 0) { int rc; if (router->master_state == BLRM_UNCONFIGURED) { free(query_text); return blr_slave_send_ok(router, slave); } rc = blr_slave_handle_variables(router, slave, brkb); /* if no var found, send empty result set */ if (rc == 0) { blr_slave_send_ok(router, slave); } if (rc >= 0) { free(query_text); return 1; } else MXS_ERROR("%s: Expected LIKE clause in SHOW VARIABLES.", router->service->name); } else if (strcasecmp(word, "MASTER") == 0) { if ((word = strtok_r(NULL, sep, &brkb)) == NULL) { MXS_ERROR("%s: Expected SHOW MASTER STATUS command", router->service->name); } else if (strcasecmp(word, "STATUS") == 0) { free(query_text); /* if state is BLRM_UNCONFIGURED return empty result */ if (router->master_state > BLRM_UNCONFIGURED) { return blr_slave_send_master_status(router, slave); } else { return blr_slave_send_ok(router, slave); } } } else if (strcasecmp(word, "SLAVE") == 0) { if ((word = strtok_r(NULL, sep, &brkb)) == NULL) { MXS_ERROR("%s: Expected SHOW SLAVE STATUS command", router->service->name); } else if (strcasecmp(word, "STATUS") == 0) { free(query_text); /* if state is BLRM_UNCONFIGURED return empty result */ if (router->master_state > BLRM_UNCONFIGURED) { return blr_slave_send_slave_status(router, slave); } else { return blr_slave_send_ok(router, slave); } } else if (strcasecmp(word, "HOSTS") == 0) { free(query_text); /* if state is BLRM_UNCONFIGURED return empty result */ if (router->master_state > BLRM_UNCONFIGURED) { return blr_slave_send_slave_hosts(router, slave); } else { return blr_slave_send_ok(router, slave); } } } else if (strcasecmp(word, "STATUS") == 0) { int rc = blr_slave_handle_status_variables(router, slave, brkb); /* if no var found, send empty result set */ if (rc == 0) { blr_slave_send_ok(router, slave); } if (rc >= 0) { free(query_text); return 1; } else { MXS_ERROR("%s: Expected LIKE clause in SHOW STATUS.", router->service->name); } } } else if (strcasecmp(query_text, "SET") == 0) { if ((word = strtok_r(NULL, sep, &brkb)) == NULL) { MXS_ERROR("%s: Incomplete set command.", router->service->name); } else if (strcasecmp(word, "@master_heartbeat_period") == 0) { int slave_heartbeat; int v_len = 0; word = strtok_r(NULL, sep, &brkb); if (word) { char *new_val; v_len = strlen(word); if (v_len > 6) { new_val = strndup(word, v_len - 6); slave->heartbeat = atoi(new_val) / 1000; } else { new_val = strndup(word, v_len); slave->heartbeat = atoi(new_val) / 1000000; } free(new_val); } free(query_text); return blr_slave_replay(router, slave, router->saved_master.heartbeat); } else if (strcasecmp(word, "@mariadb_slave_capability") == 0) { /* mariadb10 compatibility is set for the slave */ slave->mariadb10_compat = true; free(query_text); if (router->mariadb10_compat) { return blr_slave_replay(router, slave, router->saved_master.mariadb10); } else { return blr_slave_send_ok(router, slave); } } else if (strcasecmp(word, "@master_binlog_checksum") == 0) { word = strtok_r(NULL, sep, &brkb); if (word && (strcasecmp(word, "'none'") == 0)) { slave->nocrc = 1; } else if (word && (strcasecmp(word, "@@global.binlog_checksum") == 0)) { slave->nocrc = !router->master_chksum; } else { slave->nocrc = 0; } free(query_text); return blr_slave_replay(router, slave, router->saved_master.chksum1); } else if (strcasecmp(word, "@slave_uuid") == 0) { if ((word = strtok_r(NULL, sep, &brkb)) != NULL) { int len = strlen(word); char *word_ptr = word; if (len) { if (word[len - 1] == '\'') { word[len - 1] = '\0'; } if (word[0] == '\'') { word[0] = '\0'; word_ptr++; } } slave->uuid = strdup(word_ptr); } free(query_text); return blr_slave_replay(router, slave, router->saved_master.setslaveuuid); } else if (strcasecmp(word, "NAMES") == 0) { if ((word = strtok_r(NULL, sep, &brkb)) == NULL) { MXS_ERROR("%s: Truncated SET NAMES command.", router->service->name); } else if (strcasecmp(word, "latin1") == 0) { free(query_text); return blr_slave_replay(router, slave, router->saved_master.setnames); } else if (strcasecmp(word, "utf8") == 0) { free(query_text); return blr_slave_replay(router, slave, router->saved_master.utf8); } } } /* RESET current configured master */ else if (strcasecmp(query_text, "RESET") == 0) { if ((word = strtok_r(NULL, sep, &brkb)) == NULL) { MXS_ERROR("%s: Incomplete RESET command.", router->service->name); } else if (strcasecmp(word, "SLAVE") == 0) { free(query_text); if (router->master_state == BLRM_SLAVE_STOPPED) { char path[PATH_MAX + 1] = ""; char error_string[BINLOG_ERROR_MSG_LEN + 1] = ""; MASTER_SERVER_CFG *current_master = NULL; int removed_cfg = 0; /* save current replication parameters */ current_master = (MASTER_SERVER_CFG *)calloc(1, sizeof(MASTER_SERVER_CFG)); if (!current_master) { snprintf(error_string, BINLOG_ERROR_MSG_LEN, "error allocating memory for blr_master_get_config"); MXS_ERROR("%s: %s", router->service->name, error_string); blr_slave_send_error_packet(slave, error_string, (unsigned int)1201, NULL); return 1; } /* get current data */ blr_master_get_config(router, current_master); MXS_NOTICE("%s: 'RESET SLAVE executed'. Previous state MASTER_HOST='%s', " "MASTER_PORT=%i, MASTER_LOG_FILE='%s', MASTER_LOG_POS=%lu, " "MASTER_USER='%s'", router->service->name, current_master->host, current_master->port, current_master->logfile, current_master->pos, current_master->user); /* remove master.ini */ strncpy(path, router->binlogdir, PATH_MAX); strncat(path, "/master.ini", PATH_MAX); /* remove master.ini */ removed_cfg = unlink(path); if (removed_cfg == -1) { char err_msg[STRERROR_BUFLEN]; snprintf(error_string, BINLOG_ERROR_MSG_LEN, "Error removing %s, %s, errno %u", path, strerror_r(errno, err_msg, sizeof(err_msg)), errno); MXS_ERROR("%s: %s", router->service->name, error_string); } spinlock_acquire(&router->lock); router->master_state = BLRM_UNCONFIGURED; blr_master_set_empty_config(router); blr_master_free_config(current_master); spinlock_release(&router->lock); if (removed_cfg == -1) { blr_slave_send_error_packet(slave, error_string, (unsigned int)1201, NULL); return 1; } else { return blr_slave_send_ok(router, slave); } } else { if (router->master_state == BLRM_UNCONFIGURED) { blr_slave_send_ok(router, slave); } else { blr_slave_send_error_packet(slave, "This operation cannot be performed " "with a running slave; run STOP SLAVE first", (unsigned int)1198, NULL); } return 1; } } } /* start replication from the current configured master */ else if (strcasecmp(query_text, "START") == 0) { if ((word = strtok_r(NULL, sep, &brkb)) == NULL) { MXS_ERROR("%s: Incomplete START command.", router->service->name); } else if (strcasecmp(word, "SLAVE") == 0) { free(query_text); return blr_start_slave(router, slave); } } /* stop replication from the current master*/ else if (strcasecmp(query_text, "STOP") == 0) { if ((word = strtok_r(NULL, sep, &brkb)) == NULL) { MXS_ERROR("%s: Incomplete STOP command.", router->service->name); } else if (strcasecmp(word, "SLAVE") == 0) { free(query_text); return blr_stop_slave(router, slave); } } /* Change the server to replicate from */ else if (strcasecmp(query_text, "CHANGE") == 0) { if ((word = strtok_r(NULL, sep, &brkb)) == NULL) { MXS_ERROR("%s: Incomplete CHANGE command.", router->service->name); } else if (strcasecmp(word, "MASTER") == 0) { if (router->master_state != BLRM_SLAVE_STOPPED && router->master_state != BLRM_UNCONFIGURED) { free(query_text); blr_slave_send_error_packet(slave, "Cannot change master with a running slave; " "run STOP SLAVE first", (unsigned int)1198, NULL); return 1; } else { int rc; char error_string[BINLOG_ERROR_MSG_LEN + 1] = ""; MASTER_SERVER_CFG *current_master = NULL; current_master = (MASTER_SERVER_CFG *)calloc(1, sizeof(MASTER_SERVER_CFG)); if (!current_master) { free(query_text); strcpy(error_string, "Error allocating memory for blr_master_get_config"); MXS_ERROR("%s: %s", router->service->name, error_string); blr_slave_send_error_packet(slave, error_string, (unsigned int)1201, NULL); return 1; } blr_master_get_config(router, current_master); rc = blr_handle_change_master(router, brkb, error_string); free(query_text); if (rc < 0) { /* CHANGE MASTER TO has failed */ blr_slave_send_error_packet(slave, error_string, (unsigned int)1234, "42000"); blr_master_free_config(current_master); return 1; } else { int ret; char error[BINLOG_ERROR_MSG_LEN + 1]; /* Write/Update master config into master.ini file */ ret = blr_file_write_master_config(router, error); if (ret) { /* file operation failure: restore config */ spinlock_acquire(&router->lock); blr_master_apply_config(router, current_master); blr_master_free_config(current_master); spinlock_release(&router->lock); snprintf(error_string, BINLOG_ERROR_MSG_LEN, "Error writing into %s/master.ini: %s", router->binlogdir, error); MXS_ERROR("%s: %s", router->service->name, error_string); blr_slave_send_error_packet(slave, error_string, (unsigned int)1201, NULL); return 1; } /** * check if router is BLRM_UNCONFIGURED * and change state to BLRM_SLAVE_STOPPED */ if (rc == 1 || router->master_state == BLRM_UNCONFIGURED) { spinlock_acquire(&router->lock); router->master_state = BLRM_SLAVE_STOPPED; spinlock_release(&router->lock); } if (!router->trx_safe) { blr_master_free_config(current_master); } if (router->trx_safe && router->pending_transaction) { if (strcmp(router->binlog_name, router->prevbinlog) != 0) { char message[BINLOG_ERROR_MSG_LEN + 1] = ""; snprintf(message, BINLOG_ERROR_MSG_LEN, "1105:Partial transaction in file %s starting at pos %lu, " "ending at pos %lu will be lost with next START SLAVE command", current_master->logfile, current_master->safe_pos, current_master->pos); blr_master_free_config(current_master); return blr_slave_send_warning_message(router, slave, message); } else { blr_master_free_config(current_master); return blr_slave_send_ok(router, slave); } } else { return blr_slave_send_ok(router, slave); } } } } } else if (strcasecmp(query_text, "DISCONNECT") == 0) { if ((word = strtok_r(NULL, sep, &brkb)) == NULL) { MXS_ERROR("%s: Incomplete DISCONNECT command.", router->service->name); } else if (strcasecmp(word, "ALL") == 0) { free(query_text); return blr_slave_disconnect_all(router, slave); } else if (strcasecmp(word, "SERVER") == 0) { if ((word = strtok_r(NULL, sep, &brkb)) == NULL) { MXS_ERROR("%s: Expected DISCONNECT SERVER $server_id", router->service->name); } else { int serverid = atoi(word); free(query_text); return blr_slave_disconnect_server(router, slave, serverid); } } } free(query_text); query_text = strndup(qtext, query_len); MXS_ERROR("Unexpected query from '%s'@'%s': %s", slave->dcb->user, slave->dcb->remote, query_text); free(query_text); blr_slave_send_error(router, slave, "You have an error in your SQL syntax; Check the syntax " "the MaxScale binlog router accepts."); return 1; } /** * Send a reply to a command we have received from the slave. The reply itself * is merely a copy of a previous message we received from the master when we * registered as a slave. Hence we just replay this saved reply. * * @param router The binlog router instance * @param slave The slave server to which we are sending the response * @param master The saved master response * @return Non-zero if data was sent */ static int blr_slave_replay(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, GWBUF *master) { GWBUF *clone; if (router->master_state == BLRM_UNCONFIGURED) { return blr_slave_send_ok(router, slave); } if (!master) { return 0; } if ((clone = gwbuf_clone(master)) != NULL) { return slave->dcb->func.write(slave->dcb, clone); } else { MXS_ERROR("Failed to clone server response to send to slave."); return 0; } } /** * Construct an error response * * @param router The router instance * @param slave The slave server instance * @param msg The error message to send */ static void blr_slave_send_error(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, char *msg) { GWBUF *pkt; unsigned char *data; int len; if ((pkt = gwbuf_alloc(strlen(msg) + 13)) == NULL) { return; } data = GWBUF_DATA(pkt); len = strlen(msg) + 9; encode_value(&data[0], len, 24); // Payload length data[3] = 1; // Sequence id // Payload data[4] = 0xff; // Error indicator encode_value(&data[5], 1064, 16);// Error Code strncpy((char *)&data[7], "#42000", 6); memcpy(&data[13], msg, strlen(msg)); // Error Message slave->dcb->func.write(slave->dcb, pkt); } /* * Some standard packets that have been captured from a network trace of server * interactions. These packets are the schema definition sent in response to * a SELECT UNIX_TIMESTAMP() statement and the EOF packet that marks the end * of transmission of the result set. */ static uint8_t timestamp_def[] = { 0x01, 0x00, 0x00, 0x01, 0x01, 0x26, 0x00, 0x00, 0x02, 0x03, 0x64, 0x65, 0x66, 0x00, 0x00, 0x00, 0x10, 0x55, 0x4e, 0x49, 0x58, 0x5f, 0x54, 0x49, 0x4d, 0x45, 0x53, 0x54, 0x41, 0x4d, 0x50, 0x28, 0x29, 0x00, 0x0c, 0x3f, 0x00, 0x0b, 0x00, 0x00, 0x00, 0x08, 0x81, 0x00, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x03, 0xfe, 0x00, 0x00, 0x02, 0x00 }; static uint8_t timestamp_eof[] = { 0x05, 0x00, 0x00, 0x05, 0xfe, 0x00, 0x00, 0x02, 0x00 }; /** * Send a response to a "SELECT UNIX_TIMESTAMP()" request. This differs from the other * requests since we do not save a copy of the original interaction with the master * and simply replay it. We want to always send the current time. We have stored a typcial * response, which gives us the schema information normally returned. This is sent to the * client and then we add a dynamic part that will insert the current timestamp data. * Finally we send a preprepaed EOF packet to end the response stream. * * @param router The binlog router instance * @param slave The slave server to which we are sending the response * @return Non-zero if data was sent */ static int blr_slave_send_timestamp(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave) { GWBUF *pkt; char timestamp[20]; uint8_t *ptr; int len, ts_len; sprintf(timestamp, "%ld", time(0)); ts_len = strlen(timestamp); len = sizeof(timestamp_def) + sizeof(timestamp_eof) + 5 + ts_len; if ((pkt = gwbuf_alloc(len)) == NULL) { return 0; } ptr = GWBUF_DATA(pkt); memcpy(ptr, timestamp_def, sizeof(timestamp_def)); // Fixed preamble ptr += sizeof(timestamp_def); encode_value(ptr, ts_len + 1, 24); // Add length of data packet ptr += 3; *ptr++ = 0x04; // Sequence number in response *ptr++ = ts_len; // Length of result string strncpy((char *)ptr, timestamp, ts_len); // Result string ptr += ts_len; memcpy(ptr, timestamp_eof, sizeof(timestamp_eof)); // EOF packet to terminate result return slave->dcb->func.write(slave->dcb, pkt); } /** * Send a response the the SQL command SELECT @@MAXSCALE_VERSION * * @param router The binlog router instance * @param slave The slave server to which we are sending the response * @return Non-zero if data was sent */ static int blr_slave_send_maxscale_version(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave) { GWBUF *pkt; char version[80] = ""; uint8_t *ptr; int len, vers_len; sprintf(version, "%s", MAXSCALE_VERSION); vers_len = strlen(version); blr_slave_send_fieldcount(router, slave, 1); blr_slave_send_columndef(router, slave, "MAXSCALE_VERSION", BLR_TYPE_STRING, vers_len, 2); blr_slave_send_eof(router, slave, 3); len = 5 + vers_len; if ((pkt = gwbuf_alloc(len)) == NULL) { return 0; } ptr = GWBUF_DATA(pkt); encode_value(ptr, vers_len + 1, 24); // Add length of data packet ptr += 3; *ptr++ = 0x04; // Sequence number in response *ptr++ = vers_len; // Length of result string strncpy((char *)ptr, version, vers_len); // Result string ptr += vers_len; slave->dcb->func.write(slave->dcb, pkt); return blr_slave_send_eof(router, slave, 5); } /** * Send a response the the SQL command SELECT @@server_id * * @param router The binlog router instance * @param slave The slave server to which we are sending the response * @return Non-zero if data was sent */ static int blr_slave_send_server_id(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave) { GWBUF *pkt; char server_id[40]; uint8_t *ptr; int len, id_len; sprintf(server_id, "%d", router->masterid); id_len = strlen(server_id); blr_slave_send_fieldcount(router, slave, 1); blr_slave_send_columndef(router, slave, "SERVER_ID", BLR_TYPE_INT, id_len, 2); blr_slave_send_eof(router, slave, 3); len = 5 + id_len; if ((pkt = gwbuf_alloc(len)) == NULL) { return 0; } ptr = GWBUF_DATA(pkt); encode_value(ptr, id_len + 1, 24); // Add length of data packet ptr += 3; *ptr++ = 0x04; // Sequence number in response *ptr++ = id_len; // Length of result string strncpy((char *)ptr, server_id, id_len); // Result string ptr += id_len; slave->dcb->func.write(slave->dcb, pkt); return blr_slave_send_eof(router, slave, 5); } /** * Send the response to the SQL command "SHOW VARIABLES LIKE 'MAXSCALE%' * * @param router The binlog router instance * @param slave The slave server to which we are sending the response * @return Non-zero if data was sent */ static int blr_slave_send_maxscale_variables(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave) { GWBUF *pkt; char name[40]; char version[80]; uint8_t *ptr; int len, vers_len, seqno = 2; blr_slave_send_fieldcount(router, slave, 2); blr_slave_send_columndef(router, slave, "Variable_name", BLR_TYPE_STRING, 40, seqno++); blr_slave_send_columndef(router, slave, "Value", BLR_TYPE_STRING, 40, seqno++); blr_slave_send_eof(router, slave, seqno++); sprintf(version, "%s", MAXSCALE_VERSION); vers_len = strlen(version); strcpy(name, "MAXSCALE_VERSION"); len = 5 + vers_len + strlen(name) + 1; if ((pkt = gwbuf_alloc(len)) == NULL) { return 0; } ptr = GWBUF_DATA(pkt); encode_value(ptr, vers_len + 2 + strlen(name), 24); // Add length of data packet ptr += 3; *ptr++ = seqno++; // Sequence number in response *ptr++ = strlen(name); // Length of result string strncpy((char *)ptr, name, strlen(name)); // Result string ptr += strlen(name); *ptr++ = vers_len; // Length of result string strncpy((char *)ptr, version, vers_len); // Result string ptr += vers_len; slave->dcb->func.write(slave->dcb, pkt); return blr_slave_send_eof(router, slave, seqno++); } /** * Send the response to the SQL command "SHOW MASTER STATUS" * * @param router The binlog router instance * @param slave The slave server to which we are sending the response * @return Non-zero if data was sent */ static int blr_slave_send_master_status(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave) { GWBUF *pkt; char file[40]; char position[40]; uint8_t *ptr; int len, file_len; blr_slave_send_fieldcount(router, slave, 5); blr_slave_send_columndef(router, slave, "File", BLR_TYPE_STRING, 40, 2); blr_slave_send_columndef(router, slave, "Position", BLR_TYPE_STRING, 40, 3); blr_slave_send_columndef(router, slave, "Binlog_Do_DB", BLR_TYPE_STRING, 40, 4); blr_slave_send_columndef(router, slave, "Binlog_Ignore_DB", BLR_TYPE_STRING, 40, 5); blr_slave_send_columndef(router, slave, "Execute_Gtid_Set", BLR_TYPE_STRING, 40, 6); blr_slave_send_eof(router, slave, 7); sprintf(file, "%s", router->binlog_name); file_len = strlen(file); sprintf(position, "%lu", router->binlog_position); len = 5 + file_len + strlen(position) + 1 + 3; if ((pkt = gwbuf_alloc(len)) == NULL) { return 0; } ptr = GWBUF_DATA(pkt); encode_value(ptr, len - 4, 24); // Add length of data packet ptr += 3; *ptr++ = 0x08; // Sequence number in response *ptr++ = strlen(file); // Length of result string strncpy((char *)ptr, file, strlen(file)); // Result string ptr += strlen(file); *ptr++ = strlen(position); // Length of result string strncpy((char *)ptr, position, strlen(position)); // Result string ptr += strlen(position); *ptr++ = 0; // Send 3 empty values *ptr++ = 0; *ptr++ = 0; slave->dcb->func.write(slave->dcb, pkt); return blr_slave_send_eof(router, slave, 9); } /* * Columns to send for a "SHOW SLAVE STATUS" command */ static char *slave_status_columns[] = { "Slave_IO_State", "Master_Host", "Master_User", "Master_Port", "Connect_Retry", "Master_Log_File", "Read_Master_Log_Pos", "Relay_Log_File", "Relay_Log_Pos", "Relay_Master_Log_File", "Slave_IO_Running", "Slave_SQL_Running", "Replicate_Do_DB", "Replicate_Ignore_DB", "Replicate_Do_Table", "Replicate_Ignore_Table", "Replicate_Wild_Do_Table", "Replicate_Wild_Ignore_Table", "Last_Errno", "Last_Error", "Skip_Counter", "Exec_Master_Log_Pos", "Relay_Log_Space", "Until_Condition", "Until_Log_File", "Until_Log_Pos", "Master_SSL_Allowed", "Master_SSL_CA_File", "Master_SSL_CA_Path", "Master_SSL_Cert", "Master_SSL_Cipher", "Master_SSL_Key", "Seconds_Behind_Master", "Master_SSL_Verify_Server_Cert", "Last_IO_Errno", "Last_IO_Error", "Last_SQL_Errno", "Last_SQL_Error", "Replicate_Ignore_Server_Ids", "Master_Server_Id", "Master_UUID", "Master_Info_File", "SQL_Delay", "SQL_Remaining_Delay", "Slave_SQL_Running_State", "Master_Retry_Count", "Master_Bind", "Last_IO_Error_TimeStamp", "Last_SQL_Error_Timestamp", "Master_SSL_Crl", "Master_SSL_Crlpath", "Retrieved_Gtid_Set", "Executed_Gtid_Set", "Auto_Position", NULL }; /** * Send the response to the SQL command "SHOW SLAVE STATUS" * * @param router The binlog router instance * @param slave The slave server to which we are sending the response * @return Non-zero if data was sent */ static int blr_slave_send_slave_status(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave) { GWBUF *pkt; char column[42]; uint8_t *ptr; int len, actual_len, col_len, seqno, ncols, i; char *dyn_column = NULL; /* Count the columns */ for (ncols = 0; slave_status_columns[ncols]; ncols++); blr_slave_send_fieldcount(router, slave, ncols); seqno = 2; for (i = 0; slave_status_columns[i]; i++) { blr_slave_send_columndef(router, slave, slave_status_columns[i], BLR_TYPE_STRING, 40, seqno++); } blr_slave_send_eof(router, slave, seqno++); len = 5 + (ncols * 41) + 250; // Max length + 250 bytes error message if ((pkt = gwbuf_alloc(len)) == NULL) { return 0; } ptr = GWBUF_DATA(pkt); encode_value(ptr, len - 4, 24); // Add length of data packet ptr += 3; *ptr++ = seqno++; // Sequence number in response sprintf(column, "%s", blrm_states[router->master_state]); col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; sprintf(column, "%s", router->service->dbref->server->name ? router->service->dbref->server->name : ""); col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; sprintf(column, "%s", router->user ? router->user : ""); col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; sprintf(column, "%d", router->service->dbref->server->port); col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; sprintf(column, "%d", 60); // Connect retry col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; sprintf(column, "%s", router->binlog_name); col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; /* if router->trx_safe report current_pos*/ if (router->trx_safe) { sprintf(column, "%lu", router->current_pos); } else { sprintf(column, "%lu", router->binlog_position); } col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; /* We have no relay log, we relay the binlog, so we will send the same data */ sprintf(column, "%s", router->binlog_name); col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; sprintf(column, "%ld", router->binlog_position); col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; /* We have no relay log, we relay the binlog, so we will send the same data */ sprintf(column, "%s", router->binlog_name); col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; if (router->master_state != BLRM_SLAVE_STOPPED) { if (router->master_state < BLRM_BINLOGDUMP) { strcpy(column, "Connecting"); } else { strcpy(column, "Yes"); } } else { strcpy(column, "No"); } col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; if (router->master_state != BLRM_SLAVE_STOPPED) { strcpy(column, "Yes"); } else { strcpy(column, "No"); } col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; *ptr++ = 0; // Send 6 empty values *ptr++ = 0; *ptr++ = 0; *ptr++ = 0; *ptr++ = 0; *ptr++ = 0; /* Last error information */ sprintf(column, "%lu", router->m_errno); col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; /* Last error message */ if (router->m_errmsg == NULL) { *ptr++ = 0; } else { dyn_column = (char*)router->m_errmsg; col_len = strlen(dyn_column); if (col_len > 250) { col_len = 250; } *ptr++ = col_len; // Length of result string strncpy((char *)ptr, dyn_column, col_len); // Result string ptr += col_len; } /* Skip_Counter */ sprintf(column, "%d", 0); col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; sprintf(column, "%ld", router->binlog_position); col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; sprintf(column, "%ld", router->binlog_position); col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; strcpy(column, "None"); col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; *ptr++ = 0; /* Until_Log_Pos */ sprintf(column, "%d", 0); col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; /* Master_SSL_Allowed */ strcpy(column, "No"); col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; *ptr++ = 0; // Empty SSL columns *ptr++ = 0; *ptr++ = 0; *ptr++ = 0; *ptr++ = 0; /* Seconds_Behind_Master */ sprintf(column, "%d", 0); col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; /* Master_SSL_Verify_Server_Cert */ strcpy(column, "No"); col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; /* Last_IO_Error */ sprintf(column, "%d", 0); col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; *ptr++ = 0; /* Last_SQL_Error */ sprintf(column, "%d", 0); col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; *ptr++ = 0; *ptr++ = 0; /* Master_Server_Id */ sprintf(column, "%d", router->masterid); col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; sprintf(column, "%s", router->master_uuid ? router->master_uuid : router->uuid); col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; *ptr++ = 0; /* SQL_Delay*/ sprintf(column, "%d", 0); col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; *ptr++ = 0xfb; // NULL value /* Slave_Running_State */ if (router->master_state == BLRM_SLAVE_STOPPED) { strcpy(column, "Slave stopped"); } else if (!router->m_errno) { strcpy(column, "Slave running"); } else { if (router->master_state < BLRM_BINLOGDUMP) { strcpy(column, "Registering"); } else { strcpy(column, "Error"); } } col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; /* Master_Retry_Count */ sprintf(column, "%d", 1000); col_len = strlen(column); *ptr++ = col_len; // Length of result string strncpy((char *)ptr, column, col_len); // Result string ptr += col_len; *ptr++ = 0; // Send 5 empty values *ptr++ = 0; *ptr++ = 0; *ptr++ = 0; *ptr++ = 0; // No GTID support send empty values *ptr++ = 0; *ptr++ = 0; *ptr++ = 0; *ptr++ = 0; actual_len = ptr - (uint8_t *)GWBUF_DATA(pkt); ptr = GWBUF_DATA(pkt); encode_value(ptr, actual_len - 4, 24); // Add length of data packet pkt = gwbuf_rtrim(pkt, len - actual_len); // Trim the buffer to the actual size slave->dcb->func.write(slave->dcb, pkt); return blr_slave_send_eof(router, slave, seqno++); } /** * Send the response to the SQL command "SHOW SLAVE HOSTS" * * @param router The binlog router instance * @param slave The slave server to which we are sending the response * @return Non-zero if data was sent */ static int blr_slave_send_slave_hosts(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave) { GWBUF *pkt; char server_id[40]; char host[40]; char port[40]; char master_id[40]; char slave_uuid[40]; uint8_t *ptr; int len, seqno; ROUTER_SLAVE *sptr; blr_slave_send_fieldcount(router, slave, 5); blr_slave_send_columndef(router, slave, "Server_id", BLR_TYPE_STRING, 40, 2); blr_slave_send_columndef(router, slave, "Host", BLR_TYPE_STRING, 40, 3); blr_slave_send_columndef(router, slave, "Port", BLR_TYPE_STRING, 40, 4); blr_slave_send_columndef(router, slave, "Master_id", BLR_TYPE_STRING, 40, 5); blr_slave_send_columndef(router, slave, "Slave_UUID", BLR_TYPE_STRING, 40, 6); blr_slave_send_eof(router, slave, 7); seqno = 8; spinlock_acquire(&router->lock); sptr = router->slaves; while (sptr) { if (sptr->state == BLRS_DUMPING || sptr->state == BLRS_REGISTERED) { sprintf(server_id, "%d", sptr->serverid); sprintf(host, "%s", sptr->hostname ? sptr->hostname : ""); sprintf(port, "%d", sptr->port); sprintf(master_id, "%d", router->serverid); sprintf(slave_uuid, "%s", sptr->uuid ? sptr->uuid : ""); len = 4 + strlen(server_id) + strlen(host) + strlen(port) + strlen(master_id) + strlen(slave_uuid) + 5; if ((pkt = gwbuf_alloc(len)) == NULL) { return 0; } ptr = GWBUF_DATA(pkt); encode_value(ptr, len - 4, 24); // Add length of data packet ptr += 3; *ptr++ = seqno++; // Sequence number in response *ptr++ = strlen(server_id); // Length of result string strncpy((char *)ptr, server_id, strlen(server_id)); // Result string ptr += strlen(server_id); *ptr++ = strlen(host); // Length of result string strncpy((char *)ptr, host, strlen(host)); // Result string ptr += strlen(host); *ptr++ = strlen(port); // Length of result string strncpy((char *)ptr, port, strlen(port)); // Result string ptr += strlen(port); *ptr++ = strlen(master_id); // Length of result string strncpy((char *)ptr, master_id, strlen(master_id)); // Result string ptr += strlen(master_id); *ptr++ = strlen(slave_uuid); // Length of result string strncpy((char *)ptr, slave_uuid, strlen(slave_uuid)); // Result string ptr += strlen(slave_uuid); slave->dcb->func.write(slave->dcb, pkt); } sptr = sptr->next; } spinlock_release(&router->lock); return blr_slave_send_eof(router, slave, seqno); } /** * Process a slave replication registration message. * * We store the various bits of information the slave gives us and generate * a reply message: OK packet. * * @param router The router instance * @param slave The slave server * @param queue The BINLOG_DUMP packet * @return Non-zero if data was sent */ static int blr_slave_register(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, GWBUF *queue) { GWBUF *resp; uint8_t *ptr; int slen; ptr = GWBUF_DATA(queue); ptr += 4; // Skip length and sequence number if (*ptr++ != COM_REGISTER_SLAVE) { return 0; } slave->serverid = extract_field(ptr, 32); ptr += 4; slen = *ptr++; if (slen != 0) { slave->hostname = strndup((char *)ptr, slen); ptr += slen; } else { slave->hostname = NULL; } slen = *ptr++; if (slen != 0) { ptr += slen; slave->user = strndup((char *)ptr, slen); } else { slave->user = NULL; } slen = *ptr++; if (slen != 0) { slave->passwd = strndup((char *)ptr, slen); ptr += slen; } else { slave->passwd = NULL; } slave->port = extract_field(ptr, 16); ptr += 2; slave->rank = extract_field(ptr, 32); slave->state = BLRS_REGISTERED; /* * Send OK response */ return blr_slave_send_ok(router, slave); } /** * Process a COM_BINLOG_DUMP message from the slave. This is the * final step in the process of registration. The new master, MaxScale * must send a response packet and generate a fake BINLOG_ROTATE event * with the binlog file requested by the slave. And then send a * FORMAT_DESCRIPTION_EVENT that has been saved from the real master. * * Once send MaxScale must continue to send binlog events to the slave. * * @param router The router instance * @param slave The slave server * @param queue The BINLOG_DUMP packet * @return The number of bytes written to the slave */ static int blr_slave_binlog_dump(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, GWBUF *queue) { GWBUF *resp; uint8_t *ptr; int len, rval, binlognamelen; REP_HEADER hdr; uint32_t chksum; ptr = GWBUF_DATA(queue); len = extract_field(ptr, 24); binlognamelen = len - 11; if (binlognamelen > BINLOG_FNAMELEN) { MXS_ERROR("blr_slave_binlog_dump truncating binlog filename " "from %d to %d", binlognamelen, BINLOG_FNAMELEN); binlognamelen = BINLOG_FNAMELEN; } ptr += 4; // Skip length and sequence number if (*ptr++ != COM_BINLOG_DUMP) { MXS_ERROR("blr_slave_binlog_dump expected a COM_BINLOG_DUMP but received %d", *(ptr - 1)); return 0; } slave->binlog_pos = extract_field(ptr, 32); ptr += 4; ptr += 2; ptr += 4; strncpy(slave->binlogfile, (char *)ptr, binlognamelen); slave->binlogfile[binlognamelen] = 0; if (router->trx_safe) { /** * Check for a pending transaction and possible unsafe position. * Force slave disconnection if requested position is unsafe. */ bool force_disconnect = false; spinlock_acquire(&router->binlog_lock); if (router->pending_transaction && strcmp(router->binlog_name, slave->binlogfile) == 0 && (slave->binlog_pos > router->binlog_position)) { force_disconnect = true; } spinlock_release(&router->binlog_lock); if (force_disconnect) { MXS_ERROR("%s: Slave %s:%i, server-id %d, binlog '%s', blr_slave_binlog_dump failure: " "Requested binlog position %lu. Position is unsafe so disconnecting. " "Latest safe position %lu, end of binlog file %lu", router->service->name, slave->dcb->remote, ntohs((slave->dcb->ipv4).sin_port), slave->serverid, slave->binlogfile, (unsigned long)slave->binlog_pos, router->binlog_position, router->current_pos); /* * Close the slave session and socket * The slave will try to reconnect */ dcb_close(slave->dcb); return 1; } } MXS_DEBUG("%s: COM_BINLOG_DUMP: binlog name '%s', length %d, " "from position %lu.", router->service->name, slave->binlogfile, binlognamelen, (unsigned long)slave->binlog_pos); slave->seqno = 1; if (slave->nocrc) { len = BINLOG_EVENT_HDR_LEN + 8 + binlognamelen; } else { len = BINLOG_EVENT_HDR_LEN + 8 + 4 + binlognamelen; } // Build a fake rotate event resp = gwbuf_alloc(len + 5); hdr.payload_len = len + 1; hdr.seqno = slave->seqno++; hdr.ok = 0; hdr.timestamp = 0L; hdr.event_type = ROTATE_EVENT; hdr.serverid = router->masterid; hdr.event_size = len; hdr.next_pos = 0; hdr.flags = 0x20; ptr = blr_build_header(resp, &hdr); encode_value(ptr, slave->binlog_pos, 64); ptr += 8; memcpy(ptr, slave->binlogfile, binlognamelen); ptr += binlognamelen; if (!slave->nocrc) { /* * Now add the CRC to the fake binlog rotate event. * * The algorithm is first to compute the checksum of an empty buffer * and then the checksum of the event portion of the message, ie we do not * include the length, sequence number and ok byte that makes up the first * 5 bytes of the message. We also do not include the 4 byte checksum itself. */ chksum = crc32(0L, NULL, 0); chksum = crc32(chksum, GWBUF_DATA(resp) + 5, hdr.event_size - 4); encode_value(ptr, chksum, 32); } /* Send Fake Rotate Event */ rval = slave->dcb->func.write(slave->dcb, resp); /* set lastEventReceived */ slave->lastEventReceived = ROTATE_EVENT; /* set lastReply for slave heartbeat check */ if (router->send_slave_heartbeat) { slave->lastReply = time(0); } /* Send the FORMAT_DESCRIPTION_EVENT */ if (slave->binlog_pos != 4) { blr_slave_send_fde(router, slave); } /* set lastEventReceived */ slave->lastEventReceived = FORMAT_DESCRIPTION_EVENT; slave->dcb->low_water = router->low_water; slave->dcb->high_water = router->high_water; dcb_add_callback(slave->dcb, DCB_REASON_DRAINED, blr_slave_callback, slave); slave->state = BLRS_DUMPING; MXS_NOTICE("%s: Slave %s:%d, server id %d requested binlog file %s from position %lu", router->service->name, slave->dcb->remote, ntohs((slave->dcb->ipv4).sin_port), slave->serverid, slave->binlogfile, (unsigned long)slave->binlog_pos); if (slave->binlog_pos != router->binlog_position || strcmp(slave->binlogfile, router->binlog_name) != 0) { spinlock_acquire(&slave->catch_lock); slave->cstate &= ~CS_UPTODATE; slave->cstate |= CS_EXPECTCB; spinlock_release(&slave->catch_lock); poll_fake_write_event(slave->dcb); } return rval; } /** * Encode a value into a number of bits in a MySQL packet * * @param data Pointer to location in target packet * @param value The value to encode into the buffer * @param len Number of bits to encode value into */ static void encode_value(unsigned char *data, unsigned int value, int len) { while (len > 0) { *data++ = value & 0xff; value >>= 8; len -= 8; } } /** * Populate a header structure for a replication message from a GWBUF structure. * * @param pkt The incoming packet in a GWBUF chain * @param hdr The packet header to populate * @return A pointer to the first byte following the event header */ uint8_t * blr_build_header(GWBUF *pkt, REP_HEADER *hdr) { uint8_t *ptr; ptr = GWBUF_DATA(pkt); encode_value(ptr, hdr->payload_len, 24); ptr += 3; *ptr++ = hdr->seqno; *ptr++ = hdr->ok; encode_value(ptr, hdr->timestamp, 32); ptr += 4; *ptr++ = hdr->event_type; encode_value(ptr, hdr->serverid, 32); ptr += 4; encode_value(ptr, hdr->event_size, 32); ptr += 4; encode_value(ptr, hdr->next_pos, 32); ptr += 4; encode_value(ptr, hdr->flags, 16); ptr += 2; return ptr; } /** * We have a registered slave that is behind the current leading edge of the * binlog. We must replay the log entries to bring this node up to speed. * * There may be a large number of records to send to the slave, the process * is triggered by the slave COM_BINLOG_DUMP message and all the events must * be sent without receiving any new event. This measn there is no trigger into * MaxScale other than this initial message. However, if we simply send all the * events we end up with an extremely long write queue on the DCB and risk * running the server out of resources. * * The slave catchup routine will send a burst of replication events per single * call. The paramter "long" control the number of events in the burst. The * short burst is intended to be used when the master receive an event and * needs to put the slave into catchup mode. This prevents the slave taking * too much time away from the thread that is processing the master events. * * At the end of the burst a fake EPOLLOUT event is added to the poll event * queue. This ensures that the slave callback for processing DCB write drain * will be called and future catchup requests will be handled on another thread. * * @param router The binlog router * @param slave The slave that is behind * @param large Send a long or short burst of events * @return The number of bytes written */ int blr_slave_catchup(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, bool large) { GWBUF *head, *record; REP_HEADER hdr; int written, rval = 1, burst; int rotating = 0; long burst_size; uint8_t *ptr; char read_errmsg[BINLOG_ERROR_MSG_LEN + 1]; read_errmsg[BINLOG_ERROR_MSG_LEN] = '\0'; if (large) { burst = router->long_burst; } else { burst = router->short_burst; } burst_size = router->burst_size; int do_return; spinlock_acquire(&router->binlog_lock); do_return = 0; /* check for a pending transaction and safe position */ if (router->pending_transaction && strcmp(router->binlog_name, slave->binlogfile) == 0 && (slave->binlog_pos > router->binlog_position)) { do_return = 1; } spinlock_release(&router->binlog_lock); if (do_return) { spinlock_acquire(&slave->catch_lock); slave->cstate &= ~CS_BUSY; slave->cstate |= CS_EXPECTCB; spinlock_release(&slave->catch_lock); poll_fake_write_event(slave->dcb); return 0; } BLFILE *file; #ifdef BLFILE_IN_SLAVE file = slave->file; slave->file = NULL; #else file = NULL; #endif if (file == NULL) { rotating = router->rotating; if ((file = blr_open_binlog(router, slave->binlogfile)) == NULL) { char err_msg[BINLOG_ERROR_MSG_LEN + 1]; err_msg[BINLOG_ERROR_MSG_LEN] = '\0'; if (rotating) { spinlock_acquire(&slave->catch_lock); slave->cstate |= CS_EXPECTCB; slave->cstate &= ~CS_BUSY; spinlock_release(&slave->catch_lock); poll_fake_write_event(slave->dcb); return rval; } MXS_ERROR("Slave %s:%i, server-id %d, binlog '%s': blr_slave_catchup " "failed to open binlog file", slave->dcb->remote, ntohs((slave->dcb->ipv4).sin_port), slave->serverid, slave->binlogfile); slave->cstate &= ~CS_BUSY; slave->state = BLRS_ERRORED; snprintf(err_msg, BINLOG_ERROR_MSG_LEN, "Failed to open binlog '%s'", slave->binlogfile); /* Send error that stops slave replication */ blr_send_custom_error(slave->dcb, slave->seqno++, 0, err_msg, "HY000", 1236); dcb_close(slave->dcb); return 0; } } slave->stats.n_bursts++; #ifdef BLSLAVE_IN_FILE slave->file = file; #endif int events_before = slave->stats.n_events; while (burst-- && burst_size > 0 && (record = blr_read_binlog(router, file, slave->binlog_pos, &hdr, read_errmsg)) != NULL) { char binlog_name[BINLOG_FNAMELEN + 1]; uint32_t binlog_pos; strcpy(binlog_name, slave->binlogfile); binlog_pos = slave->binlog_pos; if (hdr.event_type == ROTATE_EVENT) { unsigned long beat1 = hkheartbeat; blr_close_binlog(router, file); if (hkheartbeat - beat1 > 1) { MXS_ERROR("blr_close_binlog took %lu maxscale beats", hkheartbeat - beat1); } blr_slave_rotate(router, slave, GWBUF_DATA(record)); beat1 = hkheartbeat; #ifdef BLFILE_IN_SLAVE if ((slave->file = blr_open_binlog(router, slave->binlogfile)) == NULL) #else if ((file = blr_open_binlog(router, slave->binlogfile)) == NULL) #endif { char err_msg[BINLOG_ERROR_MSG_LEN + 1]; err_msg[BINLOG_ERROR_MSG_LEN] = '\0'; if (rotating) { spinlock_acquire(&slave->catch_lock); slave->cstate |= CS_EXPECTCB; slave->cstate &= ~CS_BUSY; spinlock_release(&slave->catch_lock); poll_fake_write_event(slave->dcb); return rval; } MXS_ERROR("Slave %s:%i, server-id %d, binlog '%s': blr_slave_catchup " "failed to open binlog file in rotate event", slave->dcb->remote, ntohs((slave->dcb->ipv4).sin_port), slave->serverid, slave->binlogfile); slave->state = BLRS_ERRORED; snprintf(err_msg, BINLOG_ERROR_MSG_LEN, "Failed to open binlog '%s' in rotate event", slave->binlogfile); /* Send error that stops slave replication */ blr_send_custom_error(slave->dcb, (slave->seqno - 1), 0, err_msg, "HY000", 1236); dcb_close(slave->dcb); break; } #ifdef BLFILE_IN_SLAVE file = slave->file; #endif if (hkheartbeat - beat1 > 1) { MXS_ERROR("blr_open_binlog took %lu beats", hkheartbeat - beat1); } } if (blr_send_event(BLR_THREAD_ROLE_SLAVE, binlog_name, binlog_pos, slave, &hdr, (uint8_t*) record->start)) { if (hdr.event_type != ROTATE_EVENT) { slave->binlog_pos = hdr.next_pos; } slave->stats.n_events++; burst_size -= hdr.event_size; } else { MXS_WARNING("Slave %s:%i, server-id %d, binlog '%s, position %u: " "Slave-thread could not send event to slave, closing connection.", slave->dcb->remote, ntohs((slave->dcb->ipv4).sin_port), slave->serverid, binlog_name, binlog_pos); #ifndef BLFILE_IN_SLAVE blr_close_binlog(router, file); #endif slave->state = BLRS_ERRORED; dcb_close(slave->dcb); return 0; } gwbuf_free(record); record = NULL; /* set lastReply for slave heartbeat check */ if (router->send_slave_heartbeat) { slave->lastReply = time(0); } } if (record == NULL) { slave->stats.n_failed_read++; if (hdr.ok == SLAVE_POS_BAD_FD) { MXS_ERROR("%s Slave %s:%i, server-id %d, binlog '%s', %s", router->service->name, slave->dcb->remote, ntohs((slave->dcb->ipv4).sin_port), slave->serverid, slave->binlogfile, read_errmsg); } if (hdr.ok == SLAVE_POS_BEYOND_EOF) { MXS_ERROR("%s Slave %s:%i, server-id %d, binlog '%s', %s", router->service->name, slave->dcb->remote, ntohs((slave->dcb->ipv4).sin_port), slave->serverid, slave->binlogfile, read_errmsg); /* * Close the slave session and socket * The slave will try to reconnect */ dcb_close(slave->dcb); #ifndef BLFILE_IN_SLAVE blr_close_binlog(router, file); #endif return 0; } if (hdr.ok == SLAVE_POS_READ_ERR) { MXS_ERROR("%s Slave %s:%i, server-id %d, binlog '%s', %s", router->service->name, slave->dcb->remote, ntohs((slave->dcb->ipv4).sin_port), slave->serverid, slave->binlogfile, read_errmsg); spinlock_acquire(&slave->catch_lock); slave->state = BLRS_ERRORED; spinlock_release(&slave->catch_lock); /* * Send an error that will stop slave replication */ blr_send_custom_error(slave->dcb, slave->seqno++, 0, read_errmsg, "HY000", 1236); dcb_close(slave->dcb); #ifndef BLFILE_IN_SLAVE blr_close_binlog(router, file); #endif return 0; } if (hdr.ok == SLAVE_POS_READ_UNSAFE) { MXS_NOTICE("%s: Slave %s:%i, server-id %d, binlog '%s', read %d events, " "current committed transaction event being sent: %lu, %s", router->service->name, slave->dcb->remote, ntohs((slave->dcb->ipv4).sin_port), slave->serverid, slave->binlogfile, slave->stats.n_events - events_before, router->current_safe_event, read_errmsg); } } spinlock_acquire(&slave->catch_lock); slave->cstate &= ~CS_BUSY; spinlock_release(&slave->catch_lock); if (record) { slave->stats.n_flows++; spinlock_acquire(&slave->catch_lock); slave->cstate |= CS_EXPECTCB; spinlock_release(&slave->catch_lock); poll_fake_write_event(slave->dcb); } else if (slave->binlog_pos == router->binlog_position && strcmp(slave->binlogfile, router->binlog_name) == 0) { int state_change = 0; unsigned int cstate = 0; spinlock_acquire(&router->binlog_lock); spinlock_acquire(&slave->catch_lock); cstate = slave->cstate; /* * Now check again since we hold the router->binlog_lock * and slave->catch_lock. */ if (slave->binlog_pos != router->binlog_position || strcmp(slave->binlogfile, router->binlog_name) != 0) { slave->cstate &= ~CS_UPTODATE; slave->cstate |= CS_EXPECTCB; spinlock_release(&slave->catch_lock); spinlock_release(&router->binlog_lock); if ((cstate & CS_UPTODATE) == CS_UPTODATE) { #ifdef STATE_CHANGE_LOGGING_ENABLED MXS_NOTICE("%s: Slave %s:%d, server-id %d transition from up-to-date to " "catch-up in blr_slave_catchup, binlog file '%s', position %lu.", router->service->name, slave->dcb->remote, ntohs((slave->dcb->ipv4).sin_port), slave->serverid, slave->binlogfile, (unsigned long)slave->binlog_pos); #endif } poll_fake_write_event(slave->dcb); } else { if ((slave->cstate & CS_UPTODATE) == 0) { slave->stats.n_upd++; slave->cstate |= CS_UPTODATE; spinlock_release(&slave->catch_lock); spinlock_release(&router->binlog_lock); state_change = 1; } else { MXS_NOTICE("Execution entered branch were locks previously were NOT " "released. Previously this would have caused a lock-up."); spinlock_release(&slave->catch_lock); spinlock_release(&router->binlog_lock); } } if (state_change) { slave->stats.n_caughtup++; #ifdef STATE_CHANGE_LOGGING_ENABLED // TODO: The % 50 should be removed. Now only every 50th state change is logged. if (slave->stats.n_caughtup == 1) { MXS_NOTICE("%s: Slave %s:%d, server-id %d is now up to date '%s', position %lu.", router->service->name, slave->dcb->remote, ntohs((slave->dcb->ipv4).sin_port), slave->serverid, slave->binlogfile, (unsigned long)slave->binlog_pos); } else if ((slave->stats.n_caughtup % 50) == 0) { MXS_NOTICE("%s: Slave %s:%d, server-id %d is up to date '%s', position %lu.", router->service->name, slave->dcb->remote, ntohs((slave->dcb->ipv4).sin_port), slave->serverid, slave->binlogfile, (unsigned long)slave->binlog_pos); } #endif } } else { if (slave->binlog_pos >= blr_file_size(file) && router->rotating == 0 && strcmp(router->binlog_name, slave->binlogfile) != 0 && (blr_master_connected(router) || blr_file_next_exists(router, slave))) { /* We may have reached the end of file of a non-current * binlog file. * * Note if the master is rotating there is a window during * which the rotate event has been written to the old binlog * but the new binlog file has not yet been created. Therefore * we ignore these issues during the rotate processing. */ MXS_ERROR("%s: Slave %s:%d, server-id %d reached end of file for binlog file %s " "at %lu which is not the file currently being downloaded. " "Master binlog is %s, %lu. This may be caused by a " "previous failure of the master.", router->service->name, slave->dcb->remote, ntohs((slave->dcb->ipv4).sin_port), slave->serverid, slave->binlogfile, (unsigned long)slave->binlog_pos, router->binlog_name, router->binlog_position); #ifdef BLFILE_IN_SLAVE if (blr_slave_fake_rotate(router, slave, &slave->file)) #else if (blr_slave_fake_rotate(router, slave, &file)) #endif { spinlock_acquire(&slave->catch_lock); slave->cstate |= CS_EXPECTCB; spinlock_release(&slave->catch_lock); poll_fake_write_event(slave->dcb); } else { slave->state = BLRS_ERRORED; dcb_close(slave->dcb); } } else if (blr_master_connected(router)) { spinlock_acquire(&slave->catch_lock); slave->cstate |= CS_EXPECTCB; spinlock_release(&slave->catch_lock); poll_fake_write_event(slave->dcb); } } #ifndef BLFILE_IN_SLAVE if (file) { blr_close_binlog(router, file); } #endif return rval; } /** * The DCB callback used by the slave to obtain DCB_REASON_LOW_WATER callbacks * when the server sends all the the queue data for a DCB. This is the mechanism * that is used to implement the flow control mechanism for the sending of * large quantities of binlog records during the catchup process. * * @param dcb The DCB of the slave connection * @param reason The reason the callback was called * @param data The user data, in this case the server structure */ int blr_slave_callback(DCB *dcb, DCB_REASON reason, void *data) { ROUTER_SLAVE *slave = (ROUTER_SLAVE *)data; ROUTER_INSTANCE *router = slave->router; unsigned int cstate; if (NULL == dcb->session->router_session) { /* * The following processing will fail if there is no router session, * because the "data" parameter will not contain meaningful data, * so we have no choice but to stop here. */ return 0; } if (reason == DCB_REASON_DRAINED) { if (slave->state == BLRS_DUMPING) { spinlock_acquire(&slave->catch_lock); if (slave->cstate & CS_BUSY) { spinlock_release(&slave->catch_lock); return 0; } cstate = slave->cstate; slave->cstate &= ~(CS_UPTODATE | CS_EXPECTCB); slave->cstate |= CS_BUSY; spinlock_release(&slave->catch_lock); if ((cstate & CS_UPTODATE) == CS_UPTODATE) { #ifdef STATE_CHANGE_LOGGING_ENABLED MXS_NOTICE("%s: Slave %s:%d, server-id %d transition from up-to-date to " "catch-up in blr_slave_callback, binlog file '%s', position %lu.", router->service->name, slave->dcb->remote, ntohs((slave->dcb->ipv4).sin_port), slave->serverid, slave->binlogfile, (unsigned long)slave->binlog_pos); #endif } slave->stats.n_dcb++; blr_slave_catchup(router, slave, true); } else { MXS_DEBUG("Ignored callback due to slave state %s", blrs_states[slave->state]); } } if (reason == DCB_REASON_LOW_WATER) { if (slave->state == BLRS_DUMPING) { slave->stats.n_cb++; blr_slave_catchup(router, slave, true); } else { slave->stats.n_cbna++; } } return 0; } /** * Rotate the slave to the new binlog file * * @param slave The slave instance * @param ptr The rotate event (minus header and OK byte) */ void blr_slave_rotate(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, uint8_t *ptr) { int len = EXTRACT24(ptr + 9); // Extract the event length len = len - (BINLOG_EVENT_HDR_LEN + 8); // Remove length of header and position if (router->master_chksum) { len -= 4; } if (len > BINLOG_FNAMELEN) { len = BINLOG_FNAMELEN; } ptr += BINLOG_EVENT_HDR_LEN; // Skip header slave->binlog_pos = extract_field(ptr, 32); slave->binlog_pos += (((uint64_t)extract_field(ptr + 4, 32)) << 32); memcpy(slave->binlogfile, ptr + 8, len); slave->binlogfile[len] = 0; } /** * Generate an internal rotate event that we can use to cause the slave to move beyond * a binlog file that is misisng the rotate eent at the end. * * @param router The router instance * @param slave The slave to rotate * @return Non-zero if the rotate took place */ static int blr_slave_fake_rotate(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, BLFILE** filep) { char *sptr; int filenum; GWBUF *resp; uint8_t *ptr; int len, binlognamelen; REP_HEADER hdr; uint32_t chksum; if ((sptr = strrchr(slave->binlogfile, '.')) == NULL) { return 0; } blr_close_binlog(router, *filep); filenum = atoi(sptr + 1); sprintf(slave->binlogfile, BINLOG_NAMEFMT, router->fileroot, filenum + 1); slave->binlog_pos = 4; if ((*filep = blr_open_binlog(router, slave->binlogfile)) == NULL) { return 0; } binlognamelen = strlen(slave->binlogfile); len = BINLOG_EVENT_HDR_LEN + 8 + 4 + binlognamelen; /* no slave crc, remove 4 bytes */ if (slave->nocrc) { len -= 4; } // Build a fake rotate event resp = gwbuf_alloc(len + 5); hdr.payload_len = len + 1; hdr.seqno = slave->seqno++; hdr.ok = 0; hdr.timestamp = 0L; hdr.event_type = ROTATE_EVENT; hdr.serverid = router->masterid; hdr.event_size = len; hdr.next_pos = 0; hdr.flags = 0x20; ptr = blr_build_header(resp, &hdr); encode_value(ptr, slave->binlog_pos, 64); ptr += 8; memcpy(ptr, slave->binlogfile, binlognamelen); ptr += binlognamelen; /* if slave has crc add the chksum */ if (!slave->nocrc) { /* * Now add the CRC to the fake binlog rotate event. * * The algorithm is first to compute the checksum of an empty buffer * and then the checksum of the event portion of the message, ie we do not * include the length, sequence number and ok byte that makes up the first * 5 bytes of the message. We also do not include the 4 byte checksum itself. */ chksum = crc32(0L, NULL, 0); chksum = crc32(chksum, GWBUF_DATA(resp) + 5, hdr.event_size - 4); encode_value(ptr, chksum, 32); } slave->dcb->func.write(slave->dcb, resp); return 1; } /** * Send a "fake" format description event to the newly connected slave * * @param router The router instance * @param slave The slave to send the event to */ static void blr_slave_send_fde(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave) { BLFILE *file; REP_HEADER hdr; GWBUF *record, *head; uint8_t *ptr; uint32_t chksum; char err_msg[BINLOG_ERROR_MSG_LEN + 1]; err_msg[BINLOG_ERROR_MSG_LEN] = '\0'; memset(&hdr, 0, BINLOG_EVENT_HDR_LEN); if ((file = blr_open_binlog(router, slave->binlogfile)) == NULL) { return; } if ((record = blr_read_binlog(router, file, 4, &hdr, err_msg)) == NULL) { if (hdr.ok != SLAVE_POS_READ_OK) { MXS_ERROR("Slave %s:%i, server-id %d, binlog '%s', blr_read_binlog failure: %s", slave->dcb->remote, ntohs((slave->dcb->ipv4).sin_port), slave->serverid, slave->binlogfile, err_msg); } blr_close_binlog(router, file); return; } blr_close_binlog(router, file); head = gwbuf_alloc(5); ptr = GWBUF_DATA(head); encode_value(ptr, hdr.event_size + 1, 24); // Payload length ptr += 3; *ptr++ = slave->seqno++; *ptr++ = 0; // OK head = gwbuf_append(head, record); ptr = GWBUF_DATA(record); encode_value(ptr, time(0), 32); // Overwrite timestamp ptr += 13; encode_value(ptr, 0, 32); // Set next position to 0 /* * Since we have changed the timestamp we must recalculate the CRC * * Position ptr to the start of the event header, * calculate a new checksum * and write it into the header */ ptr = GWBUF_DATA(record) + hdr.event_size - 4; chksum = crc32(0L, NULL, 0); chksum = crc32(chksum, GWBUF_DATA(record), hdr.event_size - 4); encode_value(ptr, chksum, 32); slave->dcb->func.write(slave->dcb, head); } /** * Send the field count packet in a response packet sequence. * * @param router The router * @param slave The slave connection * @param count Number of columns in the result set * @return Non-zero on success */ static int blr_slave_send_fieldcount(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, int count) { GWBUF *pkt; uint8_t *ptr; if ((pkt = gwbuf_alloc(5)) == NULL) { return 0; } ptr = GWBUF_DATA(pkt); encode_value(ptr, 1, 24); // Add length of data packet ptr += 3; *ptr++ = 0x01; // Sequence number in response *ptr++ = count; // Length of result string return slave->dcb->func.write(slave->dcb, pkt); } /** * Send the column definition packet in a response packet sequence. * * @param router The router * @param slave The slave connection * @param name Name of the column * @param type Column type * @param len Column length * @param seqno Packet sequence number * @return Non-zero on success */ static int blr_slave_send_columndef(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, char *name, int type, int len, uint8_t seqno) { GWBUF *pkt; uint8_t *ptr; if ((pkt = gwbuf_alloc(26 + strlen(name))) == NULL) { return 0; } ptr = GWBUF_DATA(pkt); encode_value(ptr, 22 + strlen(name), 24); // Add length of data packet ptr += 3; *ptr++ = seqno; // Sequence number in response *ptr++ = 3; // Catalog is always def *ptr++ = 'd'; *ptr++ = 'e'; *ptr++ = 'f'; *ptr++ = 0; // Schema name length *ptr++ = 0; // virtual table name length *ptr++ = 0; // Table name length *ptr++ = strlen(name); // Column name length; while (*name) { *ptr++ = *name++; // Copy the column name } *ptr++ = 0; // Orginal column name *ptr++ = 0x0c; // Length of next fields always 12 *ptr++ = 0x3f; // Character set *ptr++ = 0; encode_value(ptr, len, 32); // Add length of column ptr += 4; *ptr++ = type; *ptr++ = 0x81; // Two bytes of flags if (type == 0xfd) { *ptr++ = 0x1f; } else { *ptr++ = 0x00; } *ptr++ = 0; *ptr++ = 0; *ptr++ = 0; return slave->dcb->func.write(slave->dcb, pkt); } /** * Send an EOF packet in a response packet sequence. * * @param router The router * @param slave The slave connection * @param seqno The sequence number of the EOF packet * @return Non-zero on success */ static int blr_slave_send_eof(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, int seqno) { GWBUF *pkt; uint8_t *ptr; if ((pkt = gwbuf_alloc(9)) == NULL) { return 0; } ptr = GWBUF_DATA(pkt); encode_value(ptr, 5, 24); // Add length of data packet ptr += 3; *ptr++ = seqno; // Sequence number in response *ptr++ = 0xfe; // Length of result string encode_value(ptr, 0, 16); // No errors ptr += 2; encode_value(ptr, 2, 16); // Autocommit enabled return slave->dcb->func.write(slave->dcb, pkt); } /** * Send the reply only to the SQL command "DISCONNECT SERVER $server_id' * * @param router The binlog router instance * @param slave The slave server to which we are sending the response * @return Non-zero if data was sent */ static int blr_slave_send_disconnected_server(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, int server_id, int found) { GWBUF *pkt; char state[40]; char serverid[40]; uint8_t *ptr; int len, id_len, seqno = 2; sprintf(serverid, "%d", server_id); if (found) { strcpy(state, "disconnected"); } else { strcpy(state, "not found"); } id_len = strlen(serverid); len = 4 + (1 + id_len) + (1 + strlen(state)); if ((pkt = gwbuf_alloc(len)) == NULL) { return 0; } blr_slave_send_fieldcount(router, slave, 2); blr_slave_send_columndef(router, slave, "server_id", BLR_TYPE_INT, 40, seqno++); blr_slave_send_columndef(router, slave, "state", BLR_TYPE_STRING, 40, seqno++); blr_slave_send_eof(router, slave, seqno++); ptr = GWBUF_DATA(pkt); encode_value(ptr, len - 4, 24); // Add length of data packet ptr += 3; *ptr++ = seqno++; // Sequence number in response *ptr++ = id_len; // Length of result string strncpy((char *)ptr, serverid, id_len); // Result string ptr += id_len; *ptr++ = strlen(state); // Length of result string strncpy((char *)ptr, state, strlen(state)); // Result string ptr += strlen(state); slave->dcb->func.write(slave->dcb, pkt); return blr_slave_send_eof(router, slave, seqno++); } /** * Send the response to the SQL command "DISCONNECT SERVER $server_id' * and close the connection to that server * * @param router The binlog router instance * @param slave The slave server to which we are sending the response * @param server_id The slave server_id to disconnect * @return Non-zero if data was sent to the client */ static int blr_slave_disconnect_server(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, int server_id) { ROUTER_OBJECT *router_obj = router->service->router; ROUTER_SLAVE *sptr; int n; int server_found = 0; spinlock_acquire(&router->lock); sptr = router->slaves; /* look for server_id among all registered slaves */ while (sptr) { /* don't examine slaves with state = 0 */ if ((sptr->state == BLRS_REGISTERED || sptr->state == BLRS_DUMPING) && sptr->serverid == server_id) { /* server_id found */ server_found = 1; MXS_NOTICE("%s: Slave %s, server id %d, disconnected by %s@%s", router->service->name, sptr->dcb->remote, server_id, slave->dcb->user, slave->dcb->remote); /* send server_id with disconnect state to client */ n = blr_slave_send_disconnected_server(router, slave, server_id, 1); sptr->state = BLRS_UNREGISTERED; dcb_close(sptr->dcb); break; } else { sptr = sptr->next; } } spinlock_release(&router->lock); /** server id was not found * send server_id with not found state to the client */ if (!server_found) { n = blr_slave_send_disconnected_server(router, slave, server_id, 0); } if (n == 0) { MXS_ERROR("gwbuf memory allocation in " "DISCONNECT SERVER server_id [%d]", sptr->serverid); blr_slave_send_error(router, slave, "Memory allocation error for DISCONNECT SERVER"); } return 1; } /** * Send the response to the SQL command "DISCONNECT ALL' * and close the connection to all slave servers * * @param router The binlog router instance * @param slave The slave server to which we are sending the response * @return Non-zero if data was sent to the client */ static int blr_slave_disconnect_all(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave) { ROUTER_OBJECT *router_obj = router->service->router; ROUTER_SLAVE *sptr; char server_id[40]; char state[40]; uint8_t *ptr; int len, seqno; GWBUF *pkt; /* preparing output result */ blr_slave_send_fieldcount(router, slave, 2); blr_slave_send_columndef(router, slave, "server_id", BLR_TYPE_INT, 40, 2); blr_slave_send_columndef(router, slave, "state", BLR_TYPE_STRING, 40, 3); blr_slave_send_eof(router, slave, 4); seqno = 5; spinlock_acquire(&router->lock); sptr = router->slaves; while (sptr) { /* skip servers with state = 0 */ if (sptr->state == BLRS_REGISTERED || sptr->state == BLRS_DUMPING) { sprintf(server_id, "%d", sptr->serverid); sprintf(state, "disconnected"); len = 5 + strlen(server_id) + strlen(state) + 1; if ((pkt = gwbuf_alloc(len)) == NULL) { MXS_ERROR("gwbuf memory allocation in " "DISCONNECT ALL for [%s], server_id [%d]", sptr->dcb->remote, sptr->serverid); spinlock_release(&router->lock); blr_slave_send_error(router, slave, "Memory allocation error for DISCONNECT ALL"); return 1; } MXS_NOTICE("%s: Slave %s, server id %d, disconnected by %s@%s", router->service->name, sptr->dcb->remote, sptr->serverid, slave->dcb->user, slave->dcb->remote); ptr = GWBUF_DATA(pkt); encode_value(ptr, len - 4, 24); // Add length of data packet ptr += 3; *ptr++ = seqno++; // Sequence number in response *ptr++ = strlen(server_id); // Length of result string strncpy((char *)ptr, server_id, strlen(server_id)); // Result string ptr += strlen(server_id); *ptr++ = strlen(state); // Length of result string strncpy((char *)ptr, state, strlen(state)); // Result string ptr += strlen(state); slave->dcb->func.write(slave->dcb, pkt); sptr->state = BLRS_UNREGISTERED; dcb_close(sptr->dcb); } sptr = sptr->next; } spinlock_release(&router->lock); blr_slave_send_eof(router, slave, seqno); return 1; } /** * Send a MySQL OK packet to the slave backend * * @param router The binlog router instance * @param slave The slave server to which we are sending the response * * @return result of a write call, non-zero if write was successful */ static int blr_slave_send_ok(ROUTER_INSTANCE* router, ROUTER_SLAVE* slave) { GWBUF *pkt; uint8_t *ptr; uint8_t ok_packet[] = { 7, 0, 0, // Payload length 1, // Seqno, 0, // OK, 0, 0, 2, 0, 0, 0 }; if ((pkt = gwbuf_alloc(sizeof(ok_packet))) == NULL) { return 0; } memcpy(GWBUF_DATA(pkt), ok_packet, sizeof(ok_packet)); return slave->dcb->func.write(slave->dcb, pkt); } /** * Send a MySQL OK packet with a message to the slave backend * * @param router The binlog router instance * @param message The message to send * @param slave The slave server to which we are sending the response * * @return result of a write call, non-zero if write was successful */ static int blr_slave_send_ok_message(ROUTER_INSTANCE* router, ROUTER_SLAVE* slave, char *message) { GWBUF *pkt; uint8_t *ptr; if ((pkt = gwbuf_alloc(11 + strlen(message) + 1)) == NULL) { return 0; } ptr = GWBUF_DATA(pkt); *ptr++ = 7 + strlen(message) + 1; // Payload length *ptr++ = 0; *ptr++ = 0; *ptr++ = 1; // Seqno *ptr++ = 0; // ok *ptr++ = 0; *ptr++ = 0; *ptr++ = 2; *ptr++ = 0; if (strlen(message) == 0) { *ptr++ = 0; *ptr++ = 0; } else { *ptr++ = 1; *ptr++ = 0; *ptr++ = strlen(message); strcpy((char *)ptr, message); } return slave->dcb->func.write(slave->dcb, pkt); } /** * Stop current replication from master * * @param router The binlog router instance * @param slave The slave server to which we are sending the response* * @return Always 1 for error, for send_ok the bytes sent * */ static int blr_stop_slave(ROUTER_INSTANCE* router, ROUTER_SLAVE* slave) { /* if unconfigured return an error */ if (router->master_state == BLRM_UNCONFIGURED) { blr_slave_send_warning_message(router, slave, "1255:Slave already has been stopped"); return 1; } /* if already stopped return an error */ if (router->master_state == BLRM_SLAVE_STOPPED) { blr_slave_send_warning_message(router, slave, "1255:Slave already has been stopped"); return 1; } if (router->master) { if (router->master->fd != -1 && router->master->state == DCB_STATE_POLLING) { blr_master_close(router); } } spinlock_acquire(&router->lock); router->master_state = BLRM_SLAVE_STOPPED; /* set last_safe_pos */ router->last_safe_pos = router->binlog_position; /** * Set router->prevbinlog to router->binlog_name * The FDE event with current filename may arrive after STOP SLAVE is received */ if (strcmp(router->binlog_name, router->prevbinlog) != 0) { strncpy(router->prevbinlog, router->binlog_name, BINLOG_FNAMELEN); } if (router->client) { if (router->client->fd != -1 && router->client->state == DCB_STATE_POLLING) { dcb_close(router->client); router->client = NULL; } } /* Discard the queued residual data */ while (router->residual) { router->residual = gwbuf_consume(router->residual, GWBUF_LENGTH(router->residual)); } router->residual = NULL; /* Now it is safe to unleash other threads on this router instance */ router->reconnect_pending = 0; router->active_logs = 0; spinlock_release(&router->lock); MXS_NOTICE("%s: STOP SLAVE executed by %s@%s. Disconnecting from master %s:%d, " "read up to log %s, pos %lu, transaction safe pos %lu", router->service->name, slave->dcb->user, slave->dcb->remote, router->service->dbref->server->name, router->service->dbref->server->port, router->binlog_name, router->current_pos, router->binlog_position); if (router->trx_safe && router->pending_transaction) { char message[BINLOG_ERROR_MSG_LEN + 1] = ""; snprintf(message, BINLOG_ERROR_MSG_LEN, "1105:Stopped slave mid-transaction in binlog file %s, " "pos %lu, incomplete transaction starts at pos %lu", router->binlog_name, router->current_pos, router->binlog_position); return blr_slave_send_warning_message(router, slave, message); } else { return blr_slave_send_ok(router, slave); } } /** * Start replication from current configured master * * @param router The binlog router instance * @param slave The slave server to which we are sending the response * @return Always 1 for error, for send_ok the bytes sent * */ static int blr_start_slave(ROUTER_INSTANCE* router, ROUTER_SLAVE* slave) { char path[PATH_MAX + 1] = ""; int loaded; /* if unconfigured return an error */ if (router->master_state == BLRM_UNCONFIGURED) { blr_slave_send_error_packet(slave, "The server is not configured as slave; " "fix in config file or with CHANGE MASTER TO", (unsigned int)1200, NULL); return 1; } /* if running return an error */ if (router->master_state != BLRM_UNCONNECTED && router->master_state != BLRM_SLAVE_STOPPED) { blr_slave_send_warning_message(router, slave, "1254:Slave is already running"); return 1; } spinlock_acquire(&router->lock); router->master_state = BLRM_UNCONNECTED; spinlock_release(&router->lock); /* create a new binlog or just use current one */ if (strlen(router->prevbinlog) && strcmp(router->prevbinlog, router->binlog_name)) { if (router->trx_safe && router->pending_transaction) { char msg[BINLOG_ERROR_MSG_LEN + 1] = ""; char file[PATH_MAX + 1] = ""; struct stat statb; unsigned long filelen = 0; snprintf(file, PATH_MAX, "%s/%s", router->binlogdir, router->prevbinlog); /* Get file size */ if (stat(file, &statb) == 0) { filelen = statb.st_size; } /* Prepare warning message */ snprintf(msg, BINLOG_ERROR_MSG_LEN, "1105:Truncated partial transaction in file %s, starting at pos %lu, " "ending at pos %lu. File %s now has length %lu.", router->prevbinlog, router->last_safe_pos, filelen, router->prevbinlog, router->last_safe_pos); /* Truncate previous binlog file to last_safe pos */ truncate(file, router->last_safe_pos); /* Log it */ MXS_WARNING("A transaction is still opened at pos %lu" " File %s will be truncated. " "Next binlog file is %s at pos %d, " "START SLAVE is required again.", router->last_safe_pos, router->prevbinlog, router->binlog_name, 4); spinlock_acquire(&router->lock); router->pending_transaction = 0; router->last_safe_pos = 0; router->master_state = BLRM_UNCONNECTED; router->current_pos = 4; router->binlog_position = 4; router->current_safe_event = 4; spinlock_release(&router->lock); /* Send warning message to mysql command */ blr_slave_send_warning_message(router, slave, msg); } /* create new one */ blr_file_new_binlog(router, router->binlog_name); } else { if (router->binlog_fd == -1) { /* create new one */ blr_file_new_binlog(router, router->binlog_name); } else { /* use existing one */ blr_file_use_binlog(router, router->binlog_name); } } blr_start_master(router); MXS_NOTICE("%s: START SLAVE executed by %s@%s. Trying connection to master %s:%d, " "binlog %s, pos %lu, transaction safe pos %lu", router->service->name, slave->dcb->user, slave->dcb->remote, router->service->dbref->server->name, router->service->dbref->server->port, router->binlog_name, router->current_pos, router->binlog_position); /* File path for router cached authentication data */ strcpy(path, router->binlogdir); strncat(path, "/cache", PATH_MAX); strncat(path, "/dbusers", PATH_MAX); /* Try loading dbusers from configured backends */ loaded = load_mysql_users(router->service); if (loaded < 0) { MXS_ERROR("Unable to load users for service %s", router->service->name); } else { /* update cached data */ if (loaded > 0) { blr_save_dbusers(router); } } return blr_slave_send_ok(router, slave); } /** * Construct an error packet reply with specified code and status * * @param slave The slave server instance * @param msg The error message to send * @param err_num The error number to send * @param status The error status */ static void blr_slave_send_error_packet(ROUTER_SLAVE *slave, char *msg, unsigned int err_num, char *status) { GWBUF *pkt; unsigned char *data; int len; unsigned int mysql_errno = 0; char *mysql_state; uint8_t mysql_err[2]; if ((pkt = gwbuf_alloc(strlen(msg) + 13)) == NULL) { return; } if (status != NULL) { mysql_state = status; } else { mysql_state = "HY000"; } if (err_num > 0) { mysql_errno = err_num; } else { mysql_errno = (unsigned int)2003; } data = GWBUF_DATA(pkt); len = strlen(msg) + 9; encode_value(&data[0], len, 24); // Payload length data[3] = 1; // Sequence id data[4] = 0xff; // Error indicator encode_value(&data[5], mysql_errno, 16);// Error Code data[7] = '#'; // Status message first char strncpy((char *)&data[8], mysql_state, 5); // Status message memcpy(&data[13], msg, strlen(msg)); // Error Message slave->dcb->func.write(slave->dcb, pkt); } /** * handle a 'change master' operation * * @param router The router instance * @param command The change master SQL command * @param error The error message, preallocated BINLOG_ERROR_MSG_LEN + 1 bytes * @return 0 on success, 1 on success with new binlog, -1 on failure */ static int blr_handle_change_master(ROUTER_INSTANCE* router, char *command, char *error) { char *master_logfile = NULL; char *master_log_pos = NULL; int change_binlog = 0; long long pos = 0; MASTER_SERVER_CFG *current_master = NULL; CHANGE_MASTER_OPTIONS change_master; int parse_ret; char *cmd_ptr; char *cmd_string; if ((cmd_ptr = strcasestr(command, "TO")) == NULL) { strncpy(error, "statement doesn't have the CHANGE MASTER TO syntax", BINLOG_ERROR_MSG_LEN); return -1; } if ((cmd_string = strdup(cmd_ptr + 2)) == NULL) { strncpy(error, "error allocating memory for statement parsing", BINLOG_ERROR_MSG_LEN); MXS_ERROR("%s: %s", router->service->name, error); return -1; } /* Parse SQL command and populate with found options the change_master struct */ memset(&change_master, 0, sizeof(change_master)); parse_ret = blr_parse_change_master_command(cmd_string, error, &change_master); free(cmd_string); if (parse_ret) { MXS_ERROR("%s CHANGE MASTER TO parse error: %s", router->service->name, error); blr_master_free_parsed_options(&change_master); return -1; } /* allocate struct for current replication parameters */ current_master = (MASTER_SERVER_CFG *)calloc(1, sizeof(MASTER_SERVER_CFG)); if (!current_master) { strncpy(error, "error allocating memory for blr_master_get_config", BINLOG_ERROR_MSG_LEN); MXS_ERROR("%s: %s", router->service->name, error); blr_master_free_parsed_options(&change_master); return -1; } /* save data */ blr_master_get_config(router, current_master); spinlock_acquire(&router->lock); /* * Change values in the router->service->dbref->server structure * Change filename and position in the router structure */ /* Set new binlog position from parsed SQL command */ master_log_pos = change_master.binlog_pos; if (master_log_pos == NULL) { pos = 0; } else { pos = atoll(master_log_pos); } /* Change the replication user */ blr_set_master_user(router, change_master.user); /* Change the replication password */ blr_set_master_password(router, change_master.password); /* Change the master name/address */ blr_set_master_hostname(router, change_master.host); /* Change the master port */ blr_set_master_port(router, change_master.port); /** * Change the binlog filename to request from master * New binlog file could be the next one or current one */ master_logfile = blr_set_master_logfile(router, change_master.binlog_file, error); if (master_logfile == NULL && router->master_state == BLRM_UNCONFIGURED) { /* if there is another error message keep it */ if (!strlen(error)) { strcpy(error, "Router is not configured for master connection, MASTER_LOG_FILE is required"); } MXS_ERROR("%s: %s", router->service->name, error); /* restore previous master_host and master_port */ blr_master_restore_config(router, current_master); blr_master_free_parsed_options(&change_master); spinlock_release(&router->lock); return -1; } /** * If MASTER_LOG_FILE is not set * and master connection is configured * set master_logfile to current binlog_name */ if (master_logfile == NULL) { /* if errors returned */ if (strlen(error)) { MXS_ERROR("%s: %s", router->service->name, error); /* restore previous master_host and master_port */ blr_master_restore_config(router, current_master); blr_master_free_parsed_options(&change_master); spinlock_release(&router->lock); return -1; } else { /* If not set by CHANGE MASTER, use current binlog if configured */ if (router->master_state != BLRM_UNCONFIGURED) { master_logfile = strdup(router->binlog_name); } } } /** * If master connection is configured check new binlog name: * If binlog name has changed to next one only position 4 is allowed */ if (strcmp(master_logfile, router->binlog_name) && router->master_state != BLRM_UNCONFIGURED) { int return_error = 0; if (master_log_pos == NULL) { snprintf(error, BINLOG_ERROR_MSG_LEN, "Please provide an explicit MASTER_LOG_POS for new MASTER_LOG_FILE %s: " "Permitted binlog pos is %d. Current master_log_file=%s, master_log_pos=%lu", master_logfile, 4, router->binlog_name, router->current_pos); return_error = 1; } else { if (pos != 4) { snprintf(error, BINLOG_ERROR_MSG_LEN, "Can not set MASTER_LOG_POS to %s for MASTER_LOG_FILE %s: " "Permitted binlog pos is %d. Current master_log_file=%s, master_log_pos=%lu", master_log_pos, master_logfile, 4, router->binlog_name, router->current_pos); return_error = 1; } } /* return an error or set new binlog name at pos 4 */ if (return_error) { MXS_ERROR("%s: %s", router->service->name, error); /* restore previous master_host and master_port */ blr_master_restore_config(router, current_master); blr_master_free_parsed_options(&change_master); free(master_logfile); spinlock_release(&router->lock); return -1; } else { /* set new filename at pos 4 */ memset(router->binlog_name, '\0', sizeof(router->binlog_name)); strncpy(router->binlog_name, master_logfile, BINLOG_FNAMELEN); router->current_pos = 4; router->binlog_position = 4; router->current_safe_event = 4; /* close current file binlog file, next start slave will create the new one */ fsync(router->binlog_fd); close(router->binlog_fd); router->binlog_fd = -1; MXS_INFO("%s: New MASTER_LOG_FILE is [%s]", router->service->name, router->binlog_name); } } else { /** * Same binlog or master connection not configured * Position cannot be different from current pos or 4 (if BLRM_UNCONFIGURED) */ int return_error = 0; if (router->master_state == BLRM_UNCONFIGURED) { if (master_log_pos != NULL && pos != 4) { snprintf(error, BINLOG_ERROR_MSG_LEN, "Can not set MASTER_LOG_POS to %s: " "Permitted binlog pos is 4. Specified master_log_file=%s", master_log_pos, master_logfile); return_error = 1; } } else { if (master_log_pos != NULL && pos != router->current_pos) { snprintf(error, BINLOG_ERROR_MSG_LEN, "Can not set MASTER_LOG_POS to %s: " "Permitted binlog pos is %lu. Current master_log_file=%s, master_log_pos=%lu", master_log_pos, router->current_pos, router->binlog_name, router->current_pos); return_error = 1; } } /* log error and return */ if (return_error) { MXS_ERROR("%s: %s", router->service->name, error); /* restore previous master_host and master_port */ blr_master_restore_config(router, current_master); blr_master_free_parsed_options(&change_master); free(master_logfile); spinlock_release(&router->lock); return -1; } else { /** * no pos change, set it to 4 if BLRM_UNCONFIGURED * Also set binlog name if UNCOFIGURED */ if (router->master_state == BLRM_UNCONFIGURED) { router->current_pos = 4; router->binlog_position = 4; router->current_safe_event = 4; memset(router->binlog_name, '\0', sizeof(router->binlog_name)); strncpy(router->binlog_name, master_logfile, BINLOG_FNAMELEN); MXS_INFO("%s: New MASTER_LOG_FILE is [%s]", router->service->name, router->binlog_name); } MXS_INFO("%s: New MASTER_LOG_POS is [%lu]", router->service->name, router->current_pos); } } /* Log config changes (without passwords) */ MXS_NOTICE("%s: 'CHANGE MASTER TO executed'. Previous state " "MASTER_HOST='%s', MASTER_PORT=%i, MASTER_LOG_FILE='%s', " "MASTER_LOG_POS=%lu, MASTER_USER='%s'. New state is MASTER_HOST='%s', " "MASTER_PORT=%i, MASTER_LOG_FILE='%s', MASTER_LOG_POS=%lu, MASTER_USER='%s'", router->service->name, current_master->host, current_master->port, current_master->logfile, current_master->pos, current_master->user, router->service->dbref->server->name, router->service->dbref->server->port, router->binlog_name, router->current_pos, router->user); blr_master_free_config(current_master); blr_master_free_parsed_options(&change_master); free(master_logfile); if (router->master_state == BLRM_UNCONFIGURED) { change_binlog = 1; } spinlock_release(&router->lock); return change_binlog; } /* * Set new master hostname * * @param router Current router instance * @param hostname The hostname to set * @return 1 for applied change, 0 otherwise */ static int blr_set_master_hostname(ROUTER_INSTANCE *router, char *hostname) { if (hostname) { char *ptr; char *end; ptr = strchr(hostname, '\''); if (ptr) { ptr++; } else { ptr = hostname; } end = strchr(ptr, '\''); if (end) { *end = '\0'; } server_update_address(router->service->dbref->server, ptr); MXS_INFO("%s: New MASTER_HOST is [%s]", router->service->name, router->service->dbref->server->name); return 1; } return 0; } /** * Set new master port * * @param router Current router instance * @param port The server TCP port * @return 1 for applied change, 0 otherwise */ static int blr_set_master_port(ROUTER_INSTANCE *router, char *port) { unsigned short new_port; if (port != NULL) { new_port = atoi(port); if (new_port) { server_update_port(router->service->dbref->server, new_port); MXS_INFO("%s: New MASTER_PORT is [%i]", router->service->name, router->service->dbref->server->port); return 1; } } return 0; } /* * Set new master binlog file * * The routing must be called holding router->lock * * @param router Current router instance * @param filename Binlog file name * @param error The error msg for command, pre-allocated BINLOG_ERROR_MSG_LEN + 1 bytes * @return New binlog file or NULL on error */ static char * blr_set_master_logfile(ROUTER_INSTANCE *router, char *filename, char *error) { char *new_binlog_file = NULL; if (filename) { long next_binlog_seqname; char *file_ptr; char *end; file_ptr = strchr(filename, '\''); if (file_ptr) { file_ptr++; } else { file_ptr = filename; } end = strchr(file_ptr, '\''); if (end) { *end = '\0'; } /* check binlog filename format */ end = strchr(file_ptr, '.'); if (!end) { snprintf(error, BINLOG_ERROR_MSG_LEN, "%s: selected binlog [%s] is not in the format" " '%s.yyyyyy'", router->service->name, file_ptr, router->fileroot); return NULL; } end++; if (router->master_state == BLRM_UNCONFIGURED) { char *stem_end; stem_end = strrchr(file_ptr, '.'); /* set filestem */ if (stem_end) { if (router->fileroot) { free(router->fileroot); } router->fileroot = strndup(file_ptr, stem_end - file_ptr); } /* return new filename */ new_binlog_file = strdup(file_ptr); return new_binlog_file; } /* get next binlog file name, assuming filestem is the same */ next_binlog_seqname = blr_file_get_next_binlogname(router); if (!next_binlog_seqname) { snprintf(error, BINLOG_ERROR_MSG_LEN, "%s: cannot get the next MASTER_LOG_FILE name from current binlog [%s]", router->service->name, router->binlog_name); return NULL; } /* Compare binlog file name with current one */ if (strcmp(router->binlog_name, file_ptr) == 0) { /* No binlog name change, eventually new position will be checked later */ } else { /* * This is a new binlog file request * If file is not the next one return an error */ if (atoi(end) != next_binlog_seqname) { snprintf(error, BINLOG_ERROR_MSG_LEN, "Can not set MASTER_LOG_FILE to %s: Permitted binlog file names are " "%s or %s.%06li. Current master_log_file=%s, master_log_pos=%lu", file_ptr, router->binlog_name, router->fileroot, next_binlog_seqname, router->binlog_name, router->current_pos); return NULL; } /* Binlog file name succesfully changed */ } /* allocate new filename */ new_binlog_file = strdup(file_ptr); } return new_binlog_file; } /** * Get master configuration store it * * @param router Current router instance * @param curr_master Preallocated struct to fill */ static void blr_master_get_config(ROUTER_INSTANCE *router, MASTER_SERVER_CFG *curr_master) { curr_master->port = router->service->dbref->server->port; curr_master->host = strdup(router->service->dbref->server->name); curr_master->pos = router->current_pos; curr_master->safe_pos = router->binlog_position; strncpy(curr_master->logfile, router->binlog_name, BINLOG_FNAMELEN); curr_master->user = strdup(router->user); curr_master->password = strdup(router->password); curr_master->filestem = strdup(router->fileroot); } /** * Free a master configuration struct * * @param master_cfg Saved master configuration to free */ static void blr_master_free_config(MASTER_SERVER_CFG *master_cfg) { free(master_cfg->host); free(master_cfg->user); free(master_cfg->password); free(master_cfg->filestem); free(master_cfg); } /** * Restore master configuration values for host and port * * @param router Current router instance * @param prev_master Previous saved master configuration */ static void blr_master_restore_config(ROUTER_INSTANCE *router, MASTER_SERVER_CFG *prev_master) { server_update_address(router->service->dbref->server, prev_master->host); server_update_port(router->service->dbref->server, prev_master->port); blr_master_free_config(prev_master); } /** * Set all the master configuration fields to empty values * * @param router Current router instance */ static void blr_master_set_empty_config(ROUTER_INSTANCE *router) { server_update_address(router->service->dbref->server, "none"); server_update_port(router->service->dbref->server, (unsigned short)3306); router->current_pos = 4; router->binlog_position = 4; router->current_safe_event = 4; strcpy(router->binlog_name, ""); } /** * Restore all master configuration values * * @param router Current router instance * @param prev_master Previous saved master configuration */ static void blr_master_apply_config(ROUTER_INSTANCE *router, MASTER_SERVER_CFG *prev_master) { server_update_address(router->service->dbref->server, prev_master->host); server_update_port(router->service->dbref->server, prev_master->port); router->current_pos = prev_master->pos; router->binlog_position = prev_master->safe_pos; router->current_safe_event = prev_master->safe_pos; strcpy(router->binlog_name, prev_master->logfile); if (router->user) { free(router->user); router->user = strdup(prev_master->user); } if (router->password) { free(router->password); router->password = strdup(prev_master->password); } if (router->fileroot) { free(router->fileroot); router->fileroot = strdup(prev_master->filestem); } } /** * Change the replication user * * @param router Current router instance * @param user The userto set * @return 1 for applied change, 0 otherwise */ static int blr_set_master_user(ROUTER_INSTANCE *router, char *user) { if (user != NULL) { char *ptr; char *end; ptr = strchr(user, '\''); if (ptr) { ptr++; } else { ptr = user; } end = strchr(ptr, '\''); if (end) { *end = '\0'; } if (router->user) { free(router->user); } router->user = strdup(ptr); MXS_INFO("%s: New MASTER_USER is [%s]", router->service->name, router->user); return 1; } return 0; } /** * Change the replication password * * @param router Current router instance * @param password The password to set * @return 1 for applied change, 0 otherwise */ static int blr_set_master_password(ROUTER_INSTANCE *router, char *password) { if (password != NULL) { char *ptr; char *end; ptr = strchr(password, '\''); if (ptr) { ptr++; } else { ptr = password; } end = strchr(ptr, '\''); if (end) { *end = '\0'; } if (router->password) { free(router->password); } router->password = strdup(ptr); /* don't log new password */ return 1; } return 0; } /** * Parse a CHANGE MASTER TO SQL command * * @param input The command to be parsed * @param error_string Pre-allocated string for error message, BINLOG_ERROR_MSG_LEN + 1 bytes * @param config master option struct to fill * @return 0 on success, 1 on failure */ static int blr_parse_change_master_command(char *input, char *error_string, CHANGE_MASTER_OPTIONS *config) { char *sep = ","; char *word, *brkb; if ((word = strtok_r(input, sep, &brkb)) == NULL) { sprintf(error_string, "Unable to parse query [%s]", input); return 1; } else { /* parse options key=val */ if (blr_handle_change_master_token(word, error_string, config)) { return 1; } } while ((word = strtok_r(NULL, sep, &brkb)) != NULL) { /* parse options key=val */ if (blr_handle_change_master_token(word, error_string, config)) { return 1; } } return 0; } /** * Validate option and set the value for a change master option * * @param input Current option with value * @param error pre-allocted string for error message, BINLOG_ERROR_MSG_LEN + 1 bytes * @param config master option struct to fill * @return 0 on success, 1 on error */ static int blr_handle_change_master_token(char *input, char *error, CHANGE_MASTER_OPTIONS *config) { /* space+TAB+= */ char *sep = " ="; char *word, *brkb; char *value = NULL; char **option_field = NULL; if ((word = strtok_r(input, sep, &brkb)) == NULL) { sprintf(error, "error parsing %s", brkb); return 1; } else { if ((option_field = blr_validate_change_master_option(word, config)) == NULL) { sprintf(error, "option '%s' is not supported", word); return 1; } /* value must be freed after usage */ if ((value = blr_get_parsed_command_value(brkb)) == NULL) { sprintf(error, "missing value for '%s'", word); return 1; } else { *option_field = value; } } return 0; } /** * Get value of a change master option * * @param input Current option with value * @return The new allocated option value or NULL */ static char * blr_get_parsed_command_value(char *input) { /* space+TAB+= */ char *sep = " ="; char *ret = NULL; char *word; char *value = NULL; if (strlen(input)) { value = strdup(input); } else { return ret; } if ((word = strtok_r(NULL, sep, &input)) != NULL) { char *ptr; /* remove trailing spaces */ ptr = value + strlen(value) - 1; while (ptr > value && isspace(*ptr)) { *ptr-- = 0; } ret = strdup(strstr(value, word)); free(value); } return ret; } /** * Validate a change master option * * @param option The option to check * @param config The option structure * @return A pointer to the field in the option strucure or NULL */ static char **blr_validate_change_master_option(char *option, CHANGE_MASTER_OPTIONS *config) { if (strcasecmp(option, "master_host") == 0) { return &config->host; } else if (strcasecmp(option, "master_port") == 0) { return &config->port; } else if (strcasecmp(option, "master_log_file") == 0) { return &config->binlog_file; } else if (strcasecmp(option, "master_log_pos") == 0) { return &config->binlog_pos; } else if (strcasecmp(option, "master_user") == 0) { return &config->user; } else if (strcasecmp(option, "master_password") == 0) { return &config->password; } else { return NULL; } } /** * Free parsed master options struct pointers * * @param options Parsed option struct */ static void blr_master_free_parsed_options(CHANGE_MASTER_OPTIONS *options) { free(options->host); options->host = NULL; free(options->port); options->port = NULL; free(options->user); options->user = NULL; free(options->password); options->password = NULL; free(options->binlog_file); options->binlog_file = NULL; free(options->binlog_pos); options->binlog_pos = NULL; } /** * Send a MySQL protocol response for selected variable * * @param router The binlog router instance * @param slave The slave server to which we are sending the response * @param variable The variable name * @param value The variable value * @param column_type The variable value type (string or int) * @return Non-zero if data was sent */ static int blr_slave_send_var_value(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, char *variable, char *value, int column_type) { GWBUF *pkt; uint8_t *ptr; int len, vers_len; if (value == NULL) { return blr_slave_send_ok(router, slave); } vers_len = strlen(value); blr_slave_send_fieldcount(router, slave, 1); blr_slave_send_columndef(router, slave, variable, column_type, vers_len, 2); blr_slave_send_eof(router, slave, 3); len = 5 + vers_len; if ((pkt = gwbuf_alloc(len)) == NULL) { return 0; } ptr = GWBUF_DATA(pkt); encode_value(ptr, vers_len + 1, 24); // Add length of data packet ptr += 3; *ptr++ = 0x04; // Sequence number in response *ptr++ = vers_len; // Length of result string strncpy((char *)ptr, value, vers_len); // Result string ptr += vers_len; slave->dcb->func.write(slave->dcb, pkt); return blr_slave_send_eof(router, slave, 5); } /** * Send the response to the SQL command "SHOW VARIABLES LIKE 'xxx' * * @param router The binlog router instance * @param slave The slave server to which we are sending the response * @param variable The variable name * @param value The variable value * @param column_type The variable value type (string or int) * @return Non-zero if data was sent */ static int blr_slave_send_variable(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, char *variable, char *value, int column_type) { GWBUF *pkt; uint8_t *ptr; int len, vers_len, seqno = 2; char *p = strdup(variable); int var_len; char *old_ptr = p; if (value == NULL) { return 0; } /* Remove heading and trailing "'" */ if (*p == '\'') { p++; } if (p[strlen(p) - 1] == '\'') { p[strlen(p) - 1] = '\0'; } var_len = strlen(p); /* force lowercase */ for (int i = 0; i < var_len; i++) { p[i] = tolower(p[i]); } blr_slave_send_fieldcount(router, slave, 2); blr_slave_send_columndef_with_info_schema(router, slave, "Variable_name", BLR_TYPE_STRING, 40, seqno++); blr_slave_send_columndef_with_info_schema(router, slave, "Value", column_type, 40, seqno++); blr_slave_send_eof(router, slave, seqno++); vers_len = strlen(value); len = 5 + vers_len + var_len + 1; if ((pkt = gwbuf_alloc(len)) == NULL) { return 0; } ptr = GWBUF_DATA(pkt); encode_value(ptr, vers_len + 2 + var_len, 24); // Add length of data packet ptr += 3; *ptr++ = seqno++; // Sequence number in response *ptr++ = var_len; // Length of result string strncpy((char *)ptr, p, var_len); // Result string with var name ptr += var_len; *ptr++ = vers_len; // Length of result string strncpy((char *)ptr, value, vers_len); // Result string with var value ptr += vers_len; slave->dcb->func.write(slave->dcb, pkt); free(old_ptr); return blr_slave_send_eof(router, slave, seqno++); } /** * Send the column definition packet for a variable in a response packet sequence. * * It adds information_schema and variables and variable_name * * @param router The router * @param slave The slave connection * @param name Name of the column * @param type Column type * @param len Column length * @param seqno Packet sequence number * @return Non-zero on success */ static int blr_slave_send_columndef_with_info_schema(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, char *name, int type, int len, uint8_t seqno) { GWBUF *pkt; uint8_t *ptr; int info_len = strlen("information_schema"); int virtual_table_name_len = strlen("VARIABLES"); int table_name_len = strlen("VARIABLES"); int column_name_len = strlen(name); int orig_column_name_len = strlen("VARIABLE_NAME"); int packet_data_len = 22 + strlen(name) + info_len + virtual_table_name_len + table_name_len + orig_column_name_len; if ((pkt = gwbuf_alloc(4 + packet_data_len)) == NULL) { return 0; } ptr = GWBUF_DATA(pkt); encode_value(ptr, packet_data_len, 24); // Add length of data packet ptr += 3; *ptr++ = seqno; // Sequence number in response *ptr++ = 3; // Catalog is always def *ptr++ = 'd'; *ptr++ = 'e'; *ptr++ = 'f'; *ptr++ = info_len; // Schema name length strcpy((char *)ptr, "information_schema"); ptr += info_len; *ptr++ = virtual_table_name_len; // virtual table name length strcpy((char *)ptr, "VARIABLES"); ptr += virtual_table_name_len; *ptr++ = table_name_len; // Table name length strcpy((char *)ptr, "VARIABLES"); ptr += table_name_len; *ptr++ = column_name_len; // Column name length; while (*name) { *ptr++ = *name++; // Copy the column name } *ptr++ = orig_column_name_len; // Orginal column name strcpy((char *)ptr, "VARIABLE_NAME"); ptr += orig_column_name_len; *ptr++ = 0x0c; // Length of next fields always 12 *ptr++ = 0x3f; // Character set *ptr++ = 0; encode_value(ptr, len, 32); // Add length of column ptr += 4; *ptr++ = type; *ptr++ = 0x81; // Two bytes of flags if (type == 0xfd) { *ptr++ = 0x1f; } else { *ptr++ = 0x00; } *ptr++ = 0; *ptr++ = 0; *ptr++ = 0; return slave->dcb->func.write(slave->dcb, pkt); } /** * Interface for testing blr_parse_change_master_command() * * @param input The command to be parsed * @param error_string Pre-allocated string for error message, BINLOG_ERROR_MSG_LEN + 1 bytes * @param config master option struct to fill * @return 0 on success, 1 on failure */ int blr_test_parse_change_master_command(char *input, char *error_string, CHANGE_MASTER_OPTIONS *config) { return blr_parse_change_master_command(input, error_string, config); } /* * Interface for testing set new master binlog file * * * @param router Current router instance * @param filename Binlog file name * @param error The error msg for command, pre-allocated BINLOG_ERROR_MSG_LEN + 1 bytes * @return New binlog file or NULL on error */ char * blr_test_set_master_logfile(ROUTER_INSTANCE *router, char *filename, char *error) { return blr_set_master_logfile(router, filename, error); } /** * Interface for testing a 'change master' operation * * @param router The router instance * @param command The change master SQL command * @param error The error message, preallocated BINLOG_ERROR_MSG_LEN + 1 bytes * @return 0 on success, 1 on success with new binlog, -1 on failure */ int blr_test_handle_change_master(ROUTER_INSTANCE* router, char *command, char *error) { return blr_handle_change_master(router, command, error); } /** * Handle the response to the SQL command "SHOW GLOBAL VARIABLES LIKE or SHOW VARIABLES LIKE * * @param router The binlog router instance * @param slave The slave server to which we are sending the response * @param stmt The SQL statement * @return Non-zero if the variable is handled, 0 if variable is unknown, -1 for syntax error */ static int blr_slave_handle_variables(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, char *stmt) { char *brkb; char *word; /* SPACE,TAB,= */ char *sep = " ,="; if ((word = strtok_r(stmt, sep, &brkb)) == NULL) { return -1; } else if (strcasecmp(word, "LIKE") == 0) { if ((word = strtok_r(NULL, sep, &brkb)) == NULL) { MXS_ERROR("%s: Missing LIKE clause in SHOW [GLOBAL] VARIABLES.", router->service->name); return -1; } else if (strcasecmp(word, "'SERVER_ID'") == 0) { if (router->set_master_server_id) { char server_id[40]; sprintf(server_id, "%d", router->masterid); return blr_slave_send_variable(router, slave, "'SERVER_ID'", server_id, BLR_TYPE_INT); } else { return blr_slave_replay(router, slave, router->saved_master.server_id); } } else if (strcasecmp(word, "'SERVER_UUID'") == 0) { if (router->set_master_uuid) { return blr_slave_send_variable(router, slave, "'SERVER_UUID'", router->master_uuid, BLR_TYPE_STRING); } else { return blr_slave_replay(router, slave, router->saved_master.uuid); } } else if (strcasecmp(word, "'MAXSCALE%'") == 0) { return blr_slave_send_maxscale_variables(router, slave); } else { return 0; } } else { return -1; } } /** * Send a MySQL OK packet with a warning flag to the slave backend * and set the warning message in slave structure * The message should be retrieved by SHOW WARNINGS command * * @param router The binlog router instance * @param message The message to send * @param slave The slave server to which we are sending the response * * @return result of a write call, non-zero if write was successful */ static int blr_slave_send_warning_message(ROUTER_INSTANCE* router, ROUTER_SLAVE* slave, char *message) { GWBUF *pkt; uint8_t *ptr; if ((pkt = gwbuf_alloc(11)) == NULL) { return 0; } ptr = GWBUF_DATA(pkt); *ptr++ = 7; // Payload length *ptr++ = 0; *ptr++ = 0; *ptr++ = 1; // Seqno *ptr++ = 0; // ok *ptr++ = 0; *ptr++ = 0; *ptr++ = 2; *ptr++ = 0; if (strlen(message) == 0) { *ptr++ = 0; *ptr++ = 0; } else { *ptr++ = 1; /* warning byte set to 1 */ *ptr++ = 0; } /* set the new warning in this slave connection */ if (slave->warning_msg) { free(slave->warning_msg); } slave->warning_msg = strdup(message); return slave->dcb->func.write(slave->dcb, pkt); } /** * Send a MySQL SHOW WARNINGS packet with a message that has been stored in slave struct * * If there is no wanring message an OK packet is sent * * @param router The binlog router instance * @param message The message to send * @param slave The slave server to which we are sending the response * * @return result of a write call, non-zero if write was successful */ static int blr_slave_show_warnings(ROUTER_INSTANCE* router, ROUTER_SLAVE* slave) { GWBUF *pkt; uint8_t *ptr; int len; int msg_len = 0; int code_len = 0; int level_len = 0; /* check whether a warning message is available */ if (slave->warning_msg) { char *level = "Warning"; char *msg_ptr; char err_code[16 + 1] = ""; msg_ptr = strchr(slave->warning_msg, ':'); if (msg_ptr) { strncpy(err_code, slave->warning_msg, (msg_ptr - slave->warning_msg > 16) ? 16 : (msg_ptr - slave->warning_msg)); code_len = strlen(err_code); msg_ptr++; } else { msg_ptr = slave->warning_msg; } msg_len = strlen(msg_ptr); level_len = strlen(level); blr_slave_send_fieldcount(router, slave, 3); // 3 columns blr_slave_send_columndef(router, slave, "Level", BLR_TYPE_STRING, 40, 2); blr_slave_send_columndef(router, slave, "Code", BLR_TYPE_STRING, 40, 3); blr_slave_send_columndef(router, slave, "Message", BLR_TYPE_STRING, 80, 4); blr_slave_send_eof(router, slave, 5); len = 4 + (1 + level_len) + (1 + code_len) + (1 + msg_len); if ((pkt = gwbuf_alloc(len)) == NULL) { return blr_slave_send_ok(router, slave); } ptr = GWBUF_DATA(pkt); encode_value(ptr, len - 4, 24); // Add length of data packet ptr += 3; *ptr++ = 0x06; // Sequence number in response *ptr++ = level_len; // Length of result string strncpy((char *)ptr, level, level_len); // Result string ptr += level_len; *ptr++ = code_len; // Length of result string if (code_len) { strncpy((char *)ptr, err_code, code_len); // Result string ptr += code_len; } *ptr++ = msg_len; // Length of result string if (msg_len) { strncpy((char *)ptr, msg_ptr, msg_len); // Result string ptr += msg_len; } slave->dcb->func.write(slave->dcb, pkt); return blr_slave_send_eof(router, slave, 7); } else { return blr_slave_send_ok(router, slave); } } /** * Handle the response to the SQL command "SHOW [GLOBAL] STATUS LIKE or SHOW STATUS LIKE * * @param router The binlog router instance * @param slave The slave server to which we are sending the response * @param stmt The SQL statement * @return Non-zero if the variable is handled, 0 if variable is unknown, -1 for syntax error */ static int blr_slave_handle_status_variables(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, char *stmt) { char *brkb = NULL; char *word = NULL; /* SPACE,TAB,= */ char *sep = " ,="; if ((word = strtok_r(stmt, sep, &brkb)) == NULL) { return -1; } else if (strcasecmp(word, "LIKE") == 0) { if ((word = strtok_r(NULL, sep, &brkb)) == NULL) { MXS_ERROR("%s: Missing LIKE clause in SHOW [GLOBAL] STATUS.", router->service->name); return -1; } else if (strcasecmp(word, "'Uptime'") == 0) { char uptime[41] = ""; snprintf(uptime, 40, "%d", maxscale_uptime()); return blr_slave_send_status_variable(router, slave, "Uptime", uptime, BLR_TYPE_INT); } else { return 0; } } else { return -1; } } /** * Send the response to the SQL command "SHOW [GLOBAL] STATUS LIKE 'xxx' * * @param router The binlog router instance * @param slave The slave server to which we are sending the response * @param variable The variable name * @param value The variable value * @param column_type The variable value type (string or int) * @return Non-zero if data was sent */ static int blr_slave_send_status_variable(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, char *variable, char *value, int column_type) { GWBUF *pkt; uint8_t *ptr; int len, vers_len, seqno = 2; char *p = strdup(variable); int var_len; char *old_ptr = p; /* Remove heading and trailing "'" */ if (*p == '\'') { p++; } if (p[strlen(p) - 1] == '\'') { p[strlen(p) - 1] = '\0'; } var_len = strlen(p); /* force lowercase */ for (int i = 0; i < var_len; i++) { p[i] = tolower(p[i]); } /* First char is uppercase */ p[0] = toupper(p[0]); blr_slave_send_fieldcount(router, slave, 2); blr_slave_send_columndef_with_status_schema(router, slave, "Variable_name", BLR_TYPE_STRING, 40, seqno++); blr_slave_send_columndef_with_status_schema(router, slave, "Value", column_type, 40, seqno++); blr_slave_send_eof(router, slave, seqno++); vers_len = strlen(value); len = 5 + vers_len + var_len + 1; if ((pkt = gwbuf_alloc(len)) == NULL) { return 0; } ptr = GWBUF_DATA(pkt); encode_value(ptr, vers_len + 2 + var_len, 24); // Add length of data packet ptr += 3; *ptr++ = seqno++; // Sequence number in response *ptr++ = var_len; // Length of result string strncpy((char *)ptr, p, var_len); // Result string with var name ptr += var_len; *ptr++ = vers_len; // Length of result string strncpy((char *)ptr, value, vers_len); // Result string with var value ptr += vers_len; slave->dcb->func.write(slave->dcb, pkt); free(old_ptr); return blr_slave_send_eof(router, slave, seqno++); } /** * Send the column definition packet for a STATUS variable in a response packet sequence. * * It adds information_schema.STATUS and variables and variable_name * * @param router The router * @param slave The slave connection * @param name Name of the column * @param type Column type * @param len Column length * @param seqno Packet sequence number * @return Non-zero on success */ static int blr_slave_send_columndef_with_status_schema(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave, char *name, int type, int len, uint8_t seqno) { GWBUF *pkt; uint8_t *ptr; int info_len = strlen("information_schema"); int virtual_table_name_len = strlen("STATUS"); int table_name_len = strlen("STATUS"); int column_name_len = strlen(name); int orig_column_name_len = strlen("VARIABLE_NAME"); int packet_data_len = 0; char *ptr_name_start = name; if (strcasecmp(ptr_name_start, "value") == 0) { orig_column_name_len = strlen("VARIABLE_VALUE"); } packet_data_len = 22 + strlen(name) + info_len + virtual_table_name_len + table_name_len + orig_column_name_len; if ((pkt = gwbuf_alloc(4 + packet_data_len)) == NULL) { return 0; } ptr = GWBUF_DATA(pkt); encode_value(ptr, packet_data_len, 24); // Add length of data packet ptr += 3; *ptr++ = seqno; // Sequence number in response *ptr++ = 3; // Catalog is always def *ptr++ = 'd'; *ptr++ = 'e'; *ptr++ = 'f'; *ptr++ = info_len; // Schema name length strcpy((char *)ptr, "information_schema"); ptr += info_len; *ptr++ = virtual_table_name_len; // virtual table name length strcpy((char *)ptr, "STATUS"); ptr += virtual_table_name_len; *ptr++ = table_name_len; // Table name length strcpy((char *)ptr, "STATUS"); ptr += table_name_len; *ptr++ = column_name_len; // Column name length; while (*name) { *ptr++ = *name++; // Copy the column name } *ptr++ = orig_column_name_len; // Orginal column name if (strcasecmp(ptr_name_start, "value") == 0) { strcpy((char *)ptr, "VARIABLE_VALUE"); } else { strcpy((char *)ptr, "VARIABLE_NAME"); } ptr += orig_column_name_len; *ptr++ = 0x0c; // Length of next fields always 12 *ptr++ = 0x3f; // Character set *ptr++ = 0; encode_value(ptr, len, 32); // Add length of column ptr += 4; *ptr++ = type; *ptr++ = 0x81; // Two bytes of flags if (type == 0xfd) { *ptr++ = 0x1f; } else { *ptr++ = 0x00; } *ptr++ = 0; *ptr++ = 0; *ptr++ = 0; return slave->dcb->func.write(slave->dcb, pkt); } /** * The heartbeat check function called from the housekeeper for registered slaves. * * @param router Current router instance */ static void blr_send_slave_heartbeat(void *inst) { ROUTER_SLAVE *sptr = NULL; ROUTER_INSTANCE *router = (ROUTER_INSTANCE *) inst; time_t t_now = time(0); spinlock_acquire(&router->lock); sptr = router->slaves; while (sptr) { /* skip servers with state = 0 */ if ( (sptr->state == BLRS_DUMPING) && (sptr->heartbeat > 0) && ((t_now + 1 - sptr->lastReply) >= sptr->heartbeat) ) { MXS_NOTICE("Sending Heartbeat to slave server-id %d. " "Heartbeat interval is %d, last event time is %lu", sptr->serverid, sptr->heartbeat, (unsigned long)sptr->lastReply); blr_slave_send_heartbeat(router, sptr); sptr->lastReply = t_now; } sptr = sptr->next; } spinlock_release(&router->lock); } /** * Create and send an hearbeat packet to be sent to a registered slave server */ static int blr_slave_send_heartbeat(ROUTER_INSTANCE *router, ROUTER_SLAVE *slave) { REP_HEADER hdr; GWBUF *resp; uint8_t *ptr; int len = BINLOG_EVENT_HDR_LEN; uint32_t chksum; int filename_len = strlen(slave->binlogfile); /* Add CRC32 4 bytes */ if (!slave->nocrc) { len += 4; } /* add binlogname to data content len */ len += filename_len; /** * Alloc buffer for network binlog stream: * * 4 bytes header (3 for pkt len + 1 seq.no) * 1 byte for Ok / ERR * n bytes data content * * Total = 5 bytes + len */ resp = gwbuf_alloc(5 + len); /* The OK/Err byte is part of payload */ hdr.payload_len = len + 1; /* Add sequence no */ hdr.seqno = slave->seqno++; /* Add OK */ hdr.ok = 0; /* Add timestamp: 0 */ hdr.timestamp = 0L; /* Set Event Type */ hdr.event_type = HEARTBEAT_EVENT; /* Add master server id */ hdr.serverid = router->masterid; /* Add event size */ hdr.event_size = len; /* Add Next Pos */ hdr.next_pos = slave->binlog_pos; /* Add flags */ hdr.flags = 0x20; /* point just after the header */ ptr = blr_build_header(resp, &hdr); /* Copy binlog name */ memcpy(ptr, slave->binlogfile, filename_len); ptr += filename_len; /* Add the CRC32 */ if (!slave->nocrc) { chksum = crc32(0L, NULL, 0); chksum = crc32(chksum, GWBUF_DATA(resp) + 5, hdr.event_size - 4); encode_value(ptr, chksum, 32); } /* Write the packet */ return slave->dcb->func.write(slave->dcb, resp); }