--- /dev/null
+/*
+ * Copyright (C) 2002 Stichting NLnet, Netherlands, stichting@nlnet.nl.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the
+ * above copyright notice and this permission notice appear in all
+ * copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND STICHTING NLNET
+ * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
+ * STICHTING NLNET BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+ * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+ * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE
+ * USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * The development of Dynamically Loadable Zones (DLZ) for BIND 9 was
+ * conceived and contributed by Rob Butler.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the
+ * above copyright notice and this permission notice appear in all
+ * copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND ROB BUTLER
+ * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
+ * ROB BUTLER BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+ * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+ * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE
+ * USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * Copyright (C) 1999-2001 Internet Software Consortium.
+ * Copyright (C) 2013 Internet Systems Consortium.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
+ * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
+ * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
+ * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+ * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
+ * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * This provides the externally loadable MySQL DLZ module, without
+ * update support
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#include <dlz_minimal.h>
+#include <dlz_list.h>
+#include <dlz_dbi.h>
+#include <dlz_pthread.h>
+
+#include <mysql/mysql.h>
+
+#define dbc_search_limit 30
+#define ALLNODES 1
+#define ALLOWXFR 2
+#define AUTHORITY 3
+#define FINDZONE 4
+#define COUNTZONE 5
+#define LOOKUP 6
+
+#define safeGet(in) in == NULL ? "" : in
+
+/*%
+ * Structure to hold everthing needed by this "instance" of the MySQL
+ * module remember, the module code is only loaded once, but may have
+ * many separate instances.
+ */
+typedef struct {
+#if PTHREADS
+ db_list_t *db; /*%< handle to a list of DB */
+ int dbcount;
+#else
+ dbinstance_t *db; /*%< handle to DB */
+#endif
+
+ unsigned int flags;
+ char *dbname;
+ char *host;
+ char *user;
+ char *pass;
+ char *socket;
+ int port;
+
+ /* Helper functions from the dlz_dlopen driver */
+ log_t *log;
+ dns_sdlz_putrr_t *putrr;
+ dns_sdlz_putnamedrr_t *putnamedrr;
+ dns_dlz_writeablezone_t *writeable_zone;
+} mysql_instance_t;
+
+/* forward references */
+isc_result_t
+dlz_findzonedb(void *dbdata, const char *name,
+ dns_clientinfomethods_t *methods,
+ dns_clientinfo_t *clientinfo);
+
+void
+dlz_destroy(void *dbdata);
+
+static void
+b9_add_helper(mysql_instance_t *db, const char *helper_name, void *ptr);
+
+/*
+ * Private methods
+ */
+
+void
+mysql_destroy(dbinstance_t *db) {
+ /* release DB connection */
+ if (db->dbconn != NULL)
+ mysql_close((MYSQL *) db->dbconn);
+
+ /* destroy DB instance */
+ destroy_dbinstance(db);
+}
+
+#if PTHREADS
+/*%
+ * Properly cleans up a list of database instances.
+ * This function is only used when the module is compiled for
+ * multithreaded operation.
+ */
+static void
+mysql_destroy_dblist(db_list_t *dblist) {
+ dbinstance_t *ndbi = NULL;
+ dbinstance_t *dbi = NULL;
+
+ ndbi = DLZ_LIST_HEAD(*dblist);
+ while (ndbi != NULL) {
+ dbi = ndbi;
+ ndbi = DLZ_LIST_NEXT(dbi, link);
+
+ mysql_destroy(dbi);
+ }
+
+ /* release memory for the list structure */
+ free(dblist);
+}
+
+/*%
+ * Loops through the list of DB instances, attempting to lock
+ * on the mutex. If successful, the DBI is reserved for use
+ * and the thread can perform queries against the database.
+ * If the lock fails, the next one in the list is tried.
+ * looping continues until a lock is obtained, or until
+ * the list has been searched dbc_search_limit times.
+ * This function is only used when the module is compiled for
+ * multithreaded operation.
+ */
+static dbinstance_t *
+mysql_find_avail_conn(mysql_instance_t *mysql) {
+ dbinstance_t *dbi = NULL, *head;
+ int count = 0;
+
+ /* get top of list */
+ head = dbi = DLZ_LIST_HEAD(*(mysql->db));
+
+ /* loop through list */
+ while (count < dbc_search_limit) {
+ /* try to lock on the mutex */
+ if (dlz_mutex_trylock(&dbi->lock) == 0)
+ return (dbi); /* success, return the DBI for use. */
+
+ /* not successful, keep trying */
+ dbi = DLZ_LIST_NEXT(dbi, link);
+
+ /* check to see if we have gone to the top of the list. */
+ if (dbi == NULL) {
+ count++;
+ dbi = head;
+ }
+ }
+
+ mysql->log(ISC_LOG_INFO,
+ "MySQL module unable to find available connection "
+ "after searching %d times", count);
+ return (NULL);
+}
+#endif /* PTHREADS */
+
+/*%
+ * Allocates memory for a new string, and then constructs the new
+ * string by "escaping" the input string. The new string is
+ * safe to be used in queries. This is necessary because we cannot
+ * be sure of what types of strings are passed to us, and we don't
+ * want special characters in the string causing problems.
+ */
+static char *
+mysqldrv_escape_string(MYSQL *mysql, const char *instr) {
+
+ char *outstr;
+ unsigned int len;
+
+ if (instr == NULL)
+ return (NULL);
+
+ len = strlen(instr);
+ outstr = malloc((2 * len * sizeof(char)) + 1);
+ if (outstr == NULL)
+ return (NULL);
+
+ mysql_real_escape_string(mysql, outstr, instr, len);
+
+ return (outstr);
+}
+
+/*%
+ * This function is the real core of the module. Zone, record
+ * and client strings are passed in (or NULL is passed if the
+ * string is not available). The type of query we want to run
+ * is indicated by the query flag, and the dbdata object is passed
+ * passed in to. dbdata really holds a single database instance.
+ * The function will construct and run the query, hopefully getting
+ * a result set.
+ */
+static isc_result_t
+mysql_get_resultset(const char *zone, const char *record,
+ const char *client, unsigned int query,
+ void *dbdata, MYSQL_RES **rs)
+{
+ isc_result_t result;
+ dbinstance_t *dbi = NULL;
+ mysql_instance_t *db = (mysql_instance_t *)dbdata;
+ char *querystring = NULL;
+ unsigned int i = 0;
+ unsigned int j = 0;
+ int qres = 0;
+
+#if PTHREADS
+ /* find an available DBI from the list */
+ dbi = mysql_find_avail_conn(db);
+#else /* PTHREADS */
+ /*
+ * only 1 DBI - no need to lock instance lock either
+ * only 1 thread in the whole process, no possible contention.
+ */
+ dbi = (dbinstance_t *)(db->db);
+#endif /* PTHREADS */
+
+ if (dbi == NULL) {
+ result = ISC_R_FAILURE;
+ goto cleanup;
+ }
+
+ /* what type of query are we going to run? */
+ switch(query) {
+ case ALLNODES:
+ if (dbi->allnodes_q == NULL) {
+ result = ISC_R_NOTIMPLEMENTED;
+ goto cleanup;
+ }
+ break;
+ case ALLOWXFR:
+ if (dbi->allowxfr_q == NULL) {
+ result = ISC_R_NOTIMPLEMENTED;
+ goto cleanup;
+ }
+ break;
+ case AUTHORITY:
+ if (dbi->authority_q == NULL) {
+ result = ISC_R_NOTIMPLEMENTED;
+ goto cleanup;
+ }
+ break;
+ case FINDZONE:
+ if (dbi->findzone_q == NULL) {
+ db->log(ISC_LOG_DEBUG(2),
+ "No query specified for findzone. "
+ "Findzone requires a query");
+ result = ISC_R_FAILURE;
+ goto cleanup;
+ }
+ break;
+ case COUNTZONE:
+ if (dbi->countzone_q == NULL) {
+ result = ISC_R_NOTIMPLEMENTED;
+ goto cleanup;
+ }
+ break;
+ case LOOKUP:
+ if (dbi->lookup_q == NULL) {
+ db->log(ISC_LOG_DEBUG(2),
+ "No query specified for lookup. "
+ "Lookup requires a query");
+ result = ISC_R_FAILURE;
+ goto cleanup;
+ }
+ break;
+ default:
+ db->log(ISC_LOG_ERROR,
+ "Incorrect query flag passed to "
+ "mysql_get_resultset");
+ result = ISC_R_UNEXPECTED;
+ goto cleanup;
+ }
+
+
+ if (zone != NULL) {
+ if (dbi->zone != NULL)
+ free(dbi->zone);
+
+ dbi->zone = mysqldrv_escape_string((MYSQL *) dbi->dbconn,
+ zone);
+ if (dbi->zone == NULL) {
+ result = ISC_R_NOMEMORY;
+ goto cleanup;
+ }
+ } else
+ dbi->zone = NULL;
+
+ if (record != NULL) {
+ if (dbi->record != NULL)
+ free(dbi->record);
+
+ dbi->record = mysqldrv_escape_string((MYSQL *) dbi->dbconn,
+ record);
+ if (dbi->record == NULL) {
+ result = ISC_R_NOMEMORY;
+ goto cleanup;
+ }
+ } else
+ dbi->record = NULL;
+
+ if (client != NULL) {
+ if (dbi->client != NULL)
+ free(dbi->client);
+
+ dbi->client = mysqldrv_escape_string((MYSQL *) dbi->dbconn,
+ client);
+ if (dbi->client == NULL) {
+ result = ISC_R_NOMEMORY;
+ goto cleanup;
+ }
+ } else
+ dbi->client = NULL;
+
+ /*
+ * what type of query are we going to run? this time we build
+ * the actual query to run.
+ */
+ switch(query) {
+ case ALLNODES:
+ querystring = build_querystring(dbi->allnodes_q);
+ break;
+ case ALLOWXFR:
+ querystring = build_querystring(dbi->allowxfr_q);
+ break;
+ case AUTHORITY:
+ querystring = build_querystring(dbi->authority_q);
+ break;
+ case FINDZONE:
+ querystring = build_querystring(dbi->findzone_q);
+ break;
+ case COUNTZONE:
+ querystring = build_querystring(dbi->countzone_q);
+ break;
+ case LOOKUP:
+ querystring = build_querystring(dbi->lookup_q);
+ break;
+ default:
+ db->log(ISC_LOG_ERROR,
+ "Incorrect query flag passed to "
+ "mysql_get_resultset");
+ result = ISC_R_UNEXPECTED; goto cleanup;
+ }
+
+ if (querystring == NULL) {
+ result = ISC_R_NOMEMORY;
+ goto cleanup;
+ }
+
+ /* output the full query string when debugging */
+ db->log(ISC_LOG_DEBUG(1), "\nQuery String: %s\n", querystring);
+
+ /* attempt query up to 3 times. */
+ for (i = 0; i < 3; i++) {
+ qres = mysql_query((MYSQL *) dbi->dbconn, querystring);
+ if (qres == 0)
+ break;
+ for (j = 0; j < 4; j++)
+ if (mysql_ping((MYSQL *) dbi->dbconn) == 0)
+ break;
+ }
+
+ if (qres == 0) {
+ result = ISC_R_SUCCESS;
+ if (query != COUNTZONE) {
+ *rs = mysql_store_result((MYSQL *) dbi->dbconn);
+ if (*rs == NULL)
+ result = ISC_R_FAILURE;
+ }
+ } else
+ result = ISC_R_FAILURE;
+
+ cleanup:
+ if (dbi == NULL)
+ return (ISC_R_FAILURE);
+
+ if (dbi->zone != NULL) {
+ free(dbi->zone);
+ dbi->zone = NULL;
+ }
+ if (dbi->record != NULL) {
+ free(dbi->record);
+ dbi->record = NULL;
+ }
+ if (dbi->client != NULL) {
+ free(dbi->client);
+ dbi->client = NULL;
+ }
+
+ /* release the lock so another thread can use this dbi */
+ (void) dlz_mutex_unlock(&dbi->lock);
+
+ if (querystring != NULL)
+ free(querystring);
+
+ return (result);
+}
+
+/*%
+ * The processing of result sets for lookup and authority are
+ * exactly the same. So that functionality has been moved
+ * into this function to minimize code.
+ */
+static isc_result_t
+mysql_process_rs(mysql_instance_t *db, dns_sdlzlookup_t *lookup,
+ MYSQL_RES *rs)
+{
+ isc_result_t result = ISC_R_NOTFOUND;
+ MYSQL_ROW row;
+ unsigned int fields;
+ unsigned int j;
+ char *tmpString;
+ char *endp;
+ int ttl;
+
+ fields = mysql_num_fields(rs); /* how many columns in result set */
+ row = mysql_fetch_row(rs); /* get a row from the result set */
+ while (row != NULL) {
+ unsigned int len = 0;
+
+ switch(fields) {
+ case 1:
+ /*
+ * one column in rs, it's the data field. use
+ * default type of A record, and default TTL
+ * of 86400
+ */
+ result = db->putrr(lookup, "a", 86400, safeGet(row[0]));
+ break;
+ case 2:
+ /*
+ * two columns, data field, and data type.
+ * use default TTL of 86400.
+ */
+ result = db->putrr(lookup, safeGet(row[0]), 86400,
+ safeGet(row[1]));
+ break;
+ case 3:
+ /*
+ * three columns, all data no defaults.
+ * convert text to int, make sure it worked
+ * right.
+ */
+ ttl = strtol(safeGet(row[0]), &endp, 10);
+ if (*endp != '\0' || ttl < 0) {
+ db->log(ISC_LOG_ERROR,
+ "MySQL module ttl must be "
+ "a postive number");
+ return (ISC_R_FAILURE);
+ }
+
+ result = db->putrr(lookup, safeGet(row[1]), ttl,
+ safeGet(row[2]));
+ break;
+ default:
+ /*
+ * more than 3 fields, concatenate the last
+ * ones together. figure out how long to make
+ * string.
+ */
+ for (j = 2; j < fields; j++)
+ len += strlen(safeGet(row[j])) + 1;
+
+ /*
+ * allocate string memory, allow for NULL to
+ * term string
+ */
+ tmpString = malloc(len + 1);
+ if (tmpString == NULL) {
+ db->log(ISC_LOG_ERROR,
+ "MySQL module unable to allocate "
+ "memory for temporary string");
+ mysql_free_result(rs);
+ return (ISC_R_FAILURE);
+ }
+
+ strcpy(tmpString, safeGet(row[2]));
+ for (j = 3; j < fields; j++) {
+ strcat(tmpString, " ");
+ strcat(tmpString, safeGet(row[j]));
+ }
+
+ ttl = strtol(safeGet(row[0]), &endp, 10);
+ if (*endp != '\0' || ttl < 0) {
+ db->log(ISC_LOG_ERROR,
+ "MySQL module ttl must be "
+ "a postive number");
+ return (ISC_R_FAILURE);
+ }
+
+ result = db->putrr(lookup, safeGet(row[1]),
+ ttl, tmpString);
+ free(tmpString);
+ }
+
+ if (result != ISC_R_SUCCESS) {
+ mysql_free_result(rs);
+ db->log(ISC_LOG_ERROR,
+ "putrr returned error: %d", result);
+ return (ISC_R_FAILURE);
+ }
+
+ row = mysql_fetch_row(rs);
+ }
+
+ mysql_free_result(rs);
+ return (result);
+}
+
+/*
+ * DLZ methods
+ */
+
+/*% determine if the zone is supported by (in) the database */
+isc_result_t
+dlz_findzonedb(void *dbdata, const char *name,
+ dns_clientinfomethods_t *methods,
+ dns_clientinfo_t *clientinfo)
+{
+ isc_result_t result;
+ MYSQL_RES *rs = NULL;
+ my_ulonglong rows;
+ mysql_instance_t *db = (mysql_instance_t *)dbdata;
+
+ UNUSED(methods);
+ UNUSED(clientinfo);
+
+ result = mysql_get_resultset(name, NULL, NULL, FINDZONE, dbdata, &rs);
+ if (result != ISC_R_SUCCESS || rs == NULL) {
+ if (rs != NULL)
+ mysql_free_result(rs);
+
+ db->log(ISC_LOG_ERROR,
+ "MySQL module unable to return "
+ "result set for findzone query");
+
+ return (ISC_R_FAILURE);
+ }
+
+ /*
+ * if we returned any rows, the zone is supported.
+ */
+ rows = mysql_num_rows(rs);
+ mysql_free_result(rs);
+ if (rows > 0) {
+ mysql_get_resultset(name, NULL, NULL, COUNTZONE, dbdata, NULL);
+ return (ISC_R_SUCCESS);
+ }
+
+ return (ISC_R_NOTFOUND);
+}
+
+/*% Determine if the client is allowed to perform a zone transfer */
+isc_result_t
+dlz_allowzonexfr(void *dbdata, const char *name, const char *client) {
+ isc_result_t result;
+ mysql_instance_t *db = (mysql_instance_t *)dbdata;
+ MYSQL_RES *rs = NULL;
+ my_ulonglong rows;
+
+ /* first check if the zone is supported by the database. */
+ result = dlz_findzonedb(dbdata, name, NULL, NULL);
+ if (result != ISC_R_SUCCESS)
+ return (ISC_R_NOTFOUND);
+
+ /*
+ * if we get to this point we know the zone is supported by
+ * the database the only questions now are is the zone
+ * transfer is allowed for this client and did the config file
+ * have an allow zone xfr query.
+ */
+ result = mysql_get_resultset(name, NULL, client, ALLOWXFR,
+ dbdata, &rs);
+ if (result == ISC_R_NOTIMPLEMENTED)
+ return (result);
+
+ if (result != ISC_R_SUCCESS || rs == NULL) {
+ if (rs != NULL)
+ mysql_free_result(rs);
+ db->log(ISC_LOG_ERROR,
+ "MySQL module unable to return "
+ "result set for allow xfr query");
+ return (ISC_R_FAILURE);
+ }
+
+ /*
+ * count how many rows in result set; if we returned any,
+ * zone xfr is allowed.
+ */
+ rows = mysql_num_rows(rs);
+ mysql_free_result(rs);
+ if (rows > 0)
+ return (ISC_R_SUCCESS);
+
+ return (ISC_R_NOPERM);
+}
+
+/*%
+ * If the client is allowed to perform a zone transfer, the next order of
+ * business is to get all the nodes in the zone, so bind can respond to the
+ * query.
+ */
+isc_result_t
+dlz_allnodes(const char *zone, void *dbdata, dns_sdlzallnodes_t *allnodes) {
+ isc_result_t result;
+ mysql_instance_t *db = (mysql_instance_t *)dbdata;
+ MYSQL_RES *rs = NULL;
+ MYSQL_ROW row;
+ unsigned int fields;
+ unsigned int j;
+ char *tmpString;
+ char *endp;
+ int ttl;
+
+ result = mysql_get_resultset(zone, NULL, NULL, ALLNODES, dbdata, &rs);
+ if (result == ISC_R_NOTIMPLEMENTED)
+ return (result);
+
+ /* if we didn't get a result set, log an err msg. */
+ if (result != ISC_R_SUCCESS) {
+ db->log(ISC_LOG_ERROR,
+ "MySQL module unable to return "
+ "result set for all nodes query");
+ goto cleanup;
+ }
+
+ result = ISC_R_NOTFOUND;
+
+ fields = mysql_num_fields(rs); /* how many columns in result set */
+ row = mysql_fetch_row(rs); /* get a row from the result set */
+ while (row != NULL) {
+ if (fields < 4) {
+ db->log(ISC_LOG_ERROR,
+ "MySQL module too few fields returned "
+ "by all nodes query");
+ result = ISC_R_FAILURE;
+ goto cleanup;
+ }
+
+ ttl = strtol(safeGet(row[0]), &endp, 10);
+ if (*endp != '\0' || ttl < 0) {
+ db->log(ISC_LOG_ERROR,
+ "MySQL module ttl must be "
+ "a postive number");
+ result = ISC_R_FAILURE;
+ goto cleanup;
+ }
+
+ if (fields == 4) {
+ result = db->putnamedrr(allnodes, safeGet(row[2]),
+ safeGet(row[1]), ttl,
+ safeGet(row[3]));
+ } else {
+ unsigned int len = 0;
+
+ /*
+ * more than 4 fields, concatenate the last
+ * ones together.
+ */
+ for (j = 3; j < fields; j++)
+ len += strlen(safeGet(row[j])) + 1;
+
+ tmpString = malloc(len + 1);
+ if (tmpString == NULL) {
+ db->log(ISC_LOG_ERROR,
+ "MySQL module unable to allocate "
+ "memory for temporary string");
+ result = ISC_R_FAILURE;
+ goto cleanup;
+ }
+
+ strcpy(tmpString, safeGet(row[3]));
+ for (j = 4; j < fields; j++) {
+ strcat(tmpString, " ");
+ strcat(tmpString, safeGet(row[j]));
+ }
+
+ result = db->putnamedrr(allnodes, safeGet(row[2]),
+ safeGet(row[1]),
+ ttl, tmpString);
+ free(tmpString);
+ }
+
+ if (result != ISC_R_SUCCESS) {
+ db->log(ISC_LOG_ERROR,
+ "putnamedrr returned error: %s", result);
+ result = ISC_R_FAILURE;
+ break;
+ }
+
+ row = mysql_fetch_row(rs);
+ }
+
+ cleanup:
+ if (rs != NULL)
+ mysql_free_result(rs);
+
+ return (result);
+}
+
+/*%
+ * If the lookup function does not return SOA or NS records for the zone,
+ * use this function to get that information for named.
+ */
+isc_result_t
+dlz_authority(const char *zone, void *dbdata, dns_sdlzlookup_t *lookup) {
+ isc_result_t result;
+ MYSQL_RES *rs = NULL;
+ mysql_instance_t *db = (mysql_instance_t *)dbdata;
+
+ result = mysql_get_resultset(zone, NULL, NULL, AUTHORITY, dbdata, &rs);
+ if (result == ISC_R_NOTIMPLEMENTED)
+ return (result);
+
+ if (result != ISC_R_SUCCESS) {
+ if (rs != NULL)
+ mysql_free_result(rs);
+ db->log(ISC_LOG_ERROR,
+ "MySQL module unable to return "
+ "result set for authority query");
+ return (ISC_R_FAILURE);
+ }
+
+ /*
+ * lookup and authority result sets are processed in the same
+ * manner: mysql_process_rs does the job for both functions.
+ */
+ return (mysql_process_rs(db, lookup, rs));
+}
+
+/*% If zone is supported, lookup up a (or multiple) record(s) in it */
+isc_result_t
+dlz_lookup(const char *zone, const char *name,
+ void *dbdata, dns_sdlzlookup_t *lookup,
+ dns_clientinfomethods_t *methods,
+ dns_clientinfo_t *clientinfo)
+{
+ isc_result_t result;
+ MYSQL_RES *rs = NULL;
+ mysql_instance_t *db = (mysql_instance_t *)dbdata;
+
+ UNUSED(methods);
+ UNUSED(clientinfo);
+
+ result = mysql_get_resultset(zone, name, NULL, LOOKUP, dbdata, &rs);
+
+ /* if we didn't get a result set, log an err msg. */
+ if (result != ISC_R_SUCCESS) {
+ if (rs != NULL)
+ mysql_free_result(rs);
+ db->log(ISC_LOG_ERROR,
+ "MySQL module unable to return "
+ "result set for lookup query");
+ return (ISC_R_FAILURE);
+ }
+
+ /*
+ * lookup and authority result sets are processed in the same
+ * manner: mysql_process_rs does the job for both functions.
+ */
+ return (mysql_process_rs(db, lookup, rs));
+}
+
+/*%
+ * Create an instance of the module.
+ */
+isc_result_t
+dlz_create(const char *dlzname, unsigned int argc, char *argv[],
+ void **dbdata, ...)
+{
+ isc_result_t result = ISC_R_FAILURE;
+ mysql_instance_t *mysql = NULL;
+ dbinstance_t *dbi = NULL;
+ MYSQL *dbc;
+ char *tmp = NULL;
+ char *endp;
+ int j;
+ const char *helper_name;
+#if MYSQL_VERSION_ID >= 50000
+ my_bool auto_reconnect = 1;
+#endif
+#if PTHREADS
+ int dbcount;
+ int i;
+#endif /* PTHREADS */
+ va_list ap;
+
+ UNUSED(dlzname);
+
+ /* allocate memory for MySQL instance */
+ mysql = calloc(1, sizeof(mysql_instance_t));
+ if (mysql == NULL)
+ return (ISC_R_NOMEMORY);
+ memset(mysql, 0, sizeof(mysql_instance_t));
+
+ /* Fill in the helper functions */
+ va_start(ap, dbdata);
+ while ((helper_name = va_arg(ap, const char*)) != NULL)
+ b9_add_helper(mysql, helper_name, va_arg(ap, void*));
+ va_end(ap);
+
+#if PTHREADS
+ /* if debugging, let user know we are multithreaded. */
+ mysql->log(ISC_LOG_DEBUG(1), "MySQL module running multithreaded");
+#else /* PTHREADS */
+ /* if debugging, let user know we are single threaded. */
+ mysql->log(ISC_LOG_DEBUG(1), "MySQL module running single threaded");
+#endif /* PTHREADS */
+
+ /* verify we have at least 4 arg's passed to the module */
+ if (argc < 4) {
+ mysql->log(ISC_LOG_ERROR,
+ "MySQL module requires "
+ "at least 4 command line args.");
+ return (ISC_R_FAILURE);
+ }
+
+ /* no more than 8 arg's should be passed to the module */
+ if (argc > 8) {
+ mysql->log(ISC_LOG_ERROR,
+ "MySQL module cannot accept "
+ "more than 7 command line args.");
+ return (ISC_R_FAILURE);
+ }
+
+ /* get db name - required */
+ mysql->dbname = get_parameter_value(argv[1], "dbname=");
+ if (mysql->dbname == NULL) {
+ mysql->log(ISC_LOG_ERROR,
+ "MySQL module requires a dbname parameter.");
+ result = ISC_R_FAILURE;
+ goto cleanup;
+ }
+
+ /* get db port. Not required, but must be > 0 if specified */
+ tmp = get_parameter_value(argv[1], "port=");
+ if (tmp == NULL)
+ mysql->port = 0;
+ else {
+ mysql->port = strtol(tmp, &endp, 10);
+ if (*endp != '\0' || mysql->port < 0) {
+ mysql->log(ISC_LOG_ERROR,
+ "Mysql module: port "
+ "must be a positive number.");
+ free(tmp);
+ result = ISC_R_FAILURE;
+ goto cleanup;
+ }
+ free(tmp);
+ }
+
+ mysql->host = get_parameter_value(argv[1], "host=");
+ mysql->user = get_parameter_value(argv[1], "user=");
+ mysql->pass = get_parameter_value(argv[1], "pass=");
+ mysql->socket = get_parameter_value(argv[1], "socket=");
+
+ mysql->flags = CLIENT_REMEMBER_OPTIONS;
+
+ tmp = get_parameter_value(argv[1], "compress=");
+ if (tmp != NULL) {
+ if (strcasecmp(tmp, "true") == 0)
+ mysql->flags |= CLIENT_COMPRESS;
+ free(tmp);
+ }
+
+ tmp = get_parameter_value(argv[1], "ssl=");
+ if (tmp != NULL) {
+ if (strcasecmp(tmp, "true") == 0)
+ mysql->flags |= CLIENT_SSL;
+ free(tmp);
+ }
+
+ tmp = get_parameter_value(argv[1], "space=");
+ if (tmp != NULL) {
+ if (strcasecmp(tmp, "ignore") == 0)
+ mysql->flags |= CLIENT_IGNORE_SPACE;
+ free(tmp);
+ }
+
+#if PTHREADS
+ /* multithreaded build can have multiple DB connections */
+ tmp = get_parameter_value(argv[1], "threads=");
+ if (tmp == NULL)
+ dbcount = 1;
+ else {
+ dbcount = strtol(tmp, &endp, 10);
+ if (*endp != '\0' || dbcount < 1) {
+ mysql->log(ISC_LOG_ERROR,
+ "MySQL database connection count "
+ "must be positive.");
+ free(tmp);
+ result = ISC_R_FAILURE;
+ goto cleanup;
+ }
+ free(tmp);
+ }
+
+ /* allocate memory for database connection list */
+ mysql->db = calloc(1, sizeof(db_list_t));
+ if (mysql->db == NULL) {
+ result = ISC_R_NOMEMORY;
+ goto cleanup;
+ }
+
+ /* initialize DB connection list */
+ DLZ_LIST_INIT(*(mysql->db));
+
+ /*
+ * create the appropriate number of database instances (DBI)
+ * append each new DBI to the end of the list
+ */
+ for (i = 0; i < dbcount; i++) {
+#endif /* PTHREADS */
+ switch(argc) {
+ case 4:
+ result = build_dbinstance(NULL, NULL, NULL,
+ argv[2], argv[3], NULL,
+ &dbi, mysql->log);
+ break;
+ case 5:
+ result = build_dbinstance(NULL, NULL, argv[4],
+ argv[2], argv[3], NULL,
+ &dbi, mysql->log);
+ break;
+ case 6:
+ result = build_dbinstance(argv[5], NULL, argv[4],
+ argv[2], argv[3], NULL,
+ &dbi, mysql->log);
+ break;
+ case 7:
+ result = build_dbinstance(argv[5], argv[6], argv[4],
+ argv[2], argv[3], NULL,
+ &dbi, mysql->log);
+ break;
+ case 8:
+ result = build_dbinstance(argv[5], argv[6], argv[4],
+ argv[2], argv[3], argv[7],
+ &dbi, mysql->log);
+ break;
+ default:
+ result = ISC_R_FAILURE;
+ }
+
+
+ if (result != ISC_R_SUCCESS) {
+ mysql->log(ISC_LOG_ERROR,
+ "MySQL module could not create "
+ "database instance object.");
+ result = ISC_R_FAILURE;
+ goto cleanup;
+ }
+
+#if PTHREADS
+ /* when multithreaded, build a list of DBI's */
+ DLZ_LINK_INIT(dbi, link);
+ DLZ_LIST_APPEND(*(mysql->db), dbi, link);
+#else
+ /*
+ * when single threaded, hold onto the one connection
+ * instance.
+ */
+ mysql->db = dbi;
+#endif
+
+ /* create and set db connection */
+ dbi->dbconn = mysql_init(NULL);
+ if (dbi->dbconn == NULL) {
+ mysql->log(ISC_LOG_ERROR,
+ "MySQL module could not allocate "
+ "memory for database connection");
+ result = ISC_R_FAILURE;
+ goto cleanup;
+ }
+
+ dbc = NULL;
+
+#if MYSQL_VERSION_ID >= 50000
+ /* enable automatic reconnection. */
+ if (mysql_options((MYSQL *) dbi->dbconn, MYSQL_OPT_RECONNECT,
+ &auto_reconnect) != 0) {
+ mysql->log(ISC_LOG_WARNING,
+ "MySQL module failed to set "
+ "MYSQL_OPT_RECONNECT option, continuing");
+ }
+#endif
+
+ for (j = 0; dbc == NULL && j < 4; j++) {
+ dbc = mysql_real_connect((MYSQL *) dbi->dbconn,
+ mysql->host, mysql->user,
+ mysql->pass, mysql->dbname,
+ mysql->port, mysql->socket,
+ mysql->flags);
+ if (dbc == NULL)
+ mysql->log(ISC_LOG_ERROR,
+ "MySQL connection failed: %s",
+ mysql_error((MYSQL *) dbi->dbconn));
+ }
+
+ if (dbc == NULL) {
+ mysql->log(ISC_LOG_ERROR,
+ "MySQL module failed to create "
+ "database connection after 4 attempts");
+ result = ISC_R_FAILURE;
+ goto cleanup;
+ }
+
+#if PTHREADS
+ /* set DBI = null for next loop through. */
+ dbi = NULL;
+ }
+#endif /* PTHREADS */
+
+ *dbdata = mysql;
+
+ return (ISC_R_SUCCESS);
+
+ cleanup:
+ dlz_destroy(mysql);
+
+ return (result);
+}
+
+/*%
+ * Destroy the module.
+ */
+void
+dlz_destroy(void *dbdata) {
+ mysql_instance_t *db = (mysql_instance_t *)dbdata;
+#if PTHREADS
+ /* cleanup the list of DBI's */
+ mysql_destroy_dblist((db_list_t *)(db->db));
+#else /* PTHREADS */
+ mysql_destroy(db);
+#endif /* PTHREADS */
+
+ if (db->dbname != NULL)
+ free(db->dbname);
+ if (db->host != NULL)
+ free(db->host);
+ if (db->user != NULL)
+ free(db->user);
+ if (db->pass != NULL)
+ free(db->pass);
+ if (db->socket != NULL)
+ free(db->socket);
+}
+
+/*
+ * Return the version of the API
+ */
+int
+dlz_version(unsigned int *flags) {
+ *flags |= (DNS_SDLZFLAG_RELATIVEOWNER |
+ DNS_SDLZFLAG_RELATIVERDATA |
+ DNS_SDLZFLAG_THREADSAFE);
+ return (DLZ_DLOPEN_VERSION);
+}
+
+/*
+ * Register a helper function from the bind9 dlz_dlopen driver
+ */
+static void
+b9_add_helper(mysql_instance_t *db, const char *helper_name, void *ptr) {
+ if (strcmp(helper_name, "log") == 0)
+ db->log = (log_t *)ptr;
+ if (strcmp(helper_name, "putrr") == 0)
+ db->putrr = (dns_sdlz_putrr_t *)ptr;
+ if (strcmp(helper_name, "putnamedrr") == 0)
+ db->putnamedrr = (dns_sdlz_putnamedrr_t *)ptr;
+ if (strcmp(helper_name, "writeable_zone") == 0)
+ db->writeable_zone = (dns_dlz_writeablezone_t *)ptr;
+}
projects / thirdparty / bind9.git / commitdiff
