Adding upstream version 1:9.16.44.upstream/1%9.16.44upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 780 insertions, 0 deletions

diff --git a/contrib/dlz/drivers/dlz_bdb_driver.c b/contrib/dlz/drivers/dlz_bdb_driver.c
new file mode 100644
index 0000000..5cce7ce
--- /dev/null
+++ b/contrib/dlz/drivers/dlz_bdb_driver.c
@@ -0,0 +1,780 @@
+/*
+ * Copyright (C) 2002 Stichting NLnet, Netherlands, stichting@nlnet.nl.
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0.  If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*
+ * Copyright (C) 1999-2001, 2016  Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifdef DLZ_BDB
+#include <db.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <isc/mem.h>
+#include <isc/print.h>
+#include <isc/result.h>
+#include <isc/util.h>
+
+#include <dns/log.h>
+#include <dns/result.h>
+#include <dns/sdlz.h>
+
+#include <dlz/dlz_bdb_driver.h>
+#include <named/globals.h>
+
+static dns_sdlzimplementation_t *dlz_bdb = NULL;
+
+/* should the bdb driver use threads. */
+#define bdb_threads DB_THREAD
+
+/* BDB database names */
+#define dlz_data   "dns_data"
+#define dlz_zone   "dns_zone"
+#define dlz_host   "dns_host"
+#define dlz_client "dns_client"
+
+/*%
+ * This structure contains all the Berkeley DB handles
+ * for this instance of the BDB driver.
+ */
+
+typedef struct bdb_instance {
+	DB_ENV *dbenv;	 /*%< BDB environment */
+	DB *data;	 /*%< dns_data database handle */
+	DB *zone;	 /*%< zone database handle */
+	DB *host;	 /*%< host database handle */
+	DB *client;	 /*%< client database handle */
+	isc_mem_t *mctx; /*%< memory context */
+} bdb_instance_t;
+
+typedef struct parsed_data {
+	char *zone;
+	char *host;
+	char *type;
+	int ttl;
+	char *data;
+} parsed_data_t;
+
+/* forward reference */
+
+static isc_result_t
+bdb_findzone(void *driverarg, void *dbdata, const char *name,
+	     dns_clientinfomethods_t *methods, dns_clientinfo_t *clientinfo);
+
+/*%
+ * Parses the DBT from the Berkeley DB into a parsed_data record
+ * The parsed_data record should be allocated before and passed into the
+ * bdb_parse_data function.  The char (type & data) fields should not
+ * be "free"d as that memory is part of the DBT data field.  It will be
+ * "free"d when the DBT is freed.
+ */
+
+static isc_result_t
+bdb_parse_data(char *in, parsed_data_t *pd) {
+	char *endp, *ttlStr;
+	char *tmp = in;
+	char *lastchar = (char *)&tmp[strlen(tmp) + 1];
+
+	/*%
+	 * String should be formatted as:
+	 * zone(a space)host(a space)ttl(a space)type(a space)remaining data
+	 * examples:
+	 * example.com www 10 A 127.0.0.1
+	 * example.com mail 10 A 127.0.0.2
+	 * example.com @ 10 MX 20 mail.example.com
+	 */
+
+	/* save pointer to zone */
+	pd->zone = tmp;
+
+	/* find space after zone and change it to a '\0' */
+	tmp = strchr(tmp, ' ');
+	/* verify we found a space */
+	if (tmp == NULL) {
+		return (ISC_R_FAILURE);
+	}
+	/* change the space to a null (string terminator) */
+	tmp[0] = '\0';
+	/* make sure it is safe to increment pointer */
+	if (++tmp > lastchar) {
+		return (ISC_R_FAILURE);
+	}
+
+	/* save pointer to host */
+	pd->host = tmp;
+
+	/* find space after type and change it to a '\0' */
+	tmp = strchr(tmp, ' ');
+	/* verify we found a space */
+	if (tmp == NULL) {
+		return (ISC_R_FAILURE);
+	}
+	/* change the space to a null (string terminator) */
+	tmp[0] = '\0';
+	/* make sure it is safe to increment pointer */
+	if (++tmp > lastchar) {
+		return (ISC_R_FAILURE);
+	}
+
+	/* save pointer to dns type */
+	pd->type = tmp;
+
+	/* find space after type and change it to a '\0' */
+	tmp = strchr(tmp, ' ');
+	/* verify we found a space */
+	if (tmp == NULL) {
+		return (ISC_R_FAILURE);
+	}
+	/* change the space to a null (string terminator) */
+	tmp[0] = '\0';
+	/* make sure it is safe to increment pointer */
+	if (++tmp > lastchar) {
+		return (ISC_R_FAILURE);
+	}
+
+	/* save pointer to dns ttl */
+	ttlStr = tmp;
+
+	/* find space after ttl and change it to a '\0' */
+	tmp = strchr(tmp, ' ');
+	/* verify we found a space */
+	if (tmp == NULL) {
+		return (ISC_R_FAILURE);
+	}
+	/* change the space to a null (string terminator) */
+	tmp[0] = '\0';
+	/* make sure it is safe to increment pointer */
+	if (++tmp > lastchar) {
+		return (ISC_R_FAILURE);
+	}
+
+	/* save pointer to remainder of DNS data */
+	pd->data = tmp;
+
+	/* convert ttl string to integer */
+	pd->ttl = strtol(ttlStr, &endp, 10);
+	if (*endp != '\0' || pd->ttl < 0) {
+		isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
+			      DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
+			      "BDB driver ttl must be a positive number");
+		return (ISC_R_FAILURE);
+	}
+
+	/* if we get this far everything should have worked. */
+	return (ISC_R_SUCCESS);
+}
+
+/*
+ * DLZ methods
+ */
+
+static isc_result_t
+bdb_allowzonexfr(void *driverarg, void *dbdata, const char *name,
+		 const char *client) {
+	isc_result_t result;
+	bdb_instance_t *db = (bdb_instance_t *)dbdata;
+	DBC *client_cursor = NULL;
+	DBT key, data;
+
+	/* check to see if we are authoritative for the zone first. */
+	result = bdb_findzone(driverarg, dbdata, name, NULL, NULL);
+	if (result != ISC_R_SUCCESS) {
+		return (ISC_R_NOTFOUND);
+	}
+
+	memset(&key, 0, sizeof(DBT));
+	key.flags = DB_DBT_MALLOC;
+	key.data = strdup(name);
+	if (key.data == NULL) {
+		result = ISC_R_NOMEMORY;
+		goto xfr_cleanup;
+	}
+	key.size = strlen(key.data);
+
+	memset(&data, 0, sizeof(DBT));
+	data.flags = DB_DBT_MALLOC;
+	data.data = strdup(client);
+	if (data.data == NULL) {
+		result = ISC_R_NOMEMORY;
+		goto xfr_cleanup;
+	}
+	data.size = strlen(data.data);
+
+	/* get a cursor to loop through zone data */
+	if (db->client->cursor(db->client, NULL, &client_cursor, 0) != 0) {
+		result = ISC_R_FAILURE;
+		goto xfr_cleanup;
+	}
+
+	switch (client_cursor->c_get(client_cursor, &key, &data, DB_GET_BOTH)) {
+	case DB_NOTFOUND:
+	case DB_SECONDARY_BAD:
+		result = ISC_R_NOTFOUND;
+		break;
+	case 0:
+		result = ISC_R_SUCCESS;
+		break;
+	default:
+		result = ISC_R_FAILURE;
+	}
+
+xfr_cleanup:
+
+	/* free any memory duplicate string in the key field */
+	if (key.data != NULL) {
+		free(key.data);
+	}
+
+	/* free any memory allocated to the data field. */
+	if (data.data != NULL) {
+		free(data.data);
+	}
+
+	/* get rid of zone_cursor */
+	if (client_cursor != NULL) {
+		client_cursor->c_close(client_cursor);
+	}
+
+	return (result);
+}
+
+static isc_result_t
+bdb_allnodes(const char *zone, void *driverarg, void *dbdata,
+	     dns_sdlzallnodes_t *allnodes) {
+	isc_result_t result = ISC_R_NOTFOUND;
+	bdb_instance_t *db = (bdb_instance_t *)dbdata;
+	DBC *zone_cursor = NULL;
+	DBT key, data;
+	int flags;
+	int bdbres;
+	parsed_data_t pd;
+	char *tmp = NULL, *tmp_zone;
+
+	UNUSED(driverarg);
+
+	memset(&key, 0, sizeof(DBT));
+	memset(&data, 0, sizeof(DBT));
+
+	key.data = tmp_zone = strdup(zone);
+
+	if (key.data == NULL) {
+		return (ISC_R_NOMEMORY);
+	}
+
+	key.size = strlen(key.data);
+
+	/* get a cursor to loop through zone data */
+	if (db->zone->cursor(db->zone, NULL, &zone_cursor, 0) != 0) {
+		result = ISC_R_FAILURE;
+		goto allnodes_cleanup;
+	}
+
+	flags = DB_SET;
+
+	while ((bdbres = zone_cursor->c_get(zone_cursor, &key, &data, flags)) ==
+	       0)
+	{
+		flags = DB_NEXT_DUP;
+
+		tmp = realloc(tmp, data.size + 1);
+		if (tmp == NULL) {
+			goto allnodes_cleanup;
+		}
+
+		strncpy(tmp, data.data, data.size);
+		tmp[data.size] = '\0';
+
+		if (bdb_parse_data(tmp, &pd) != ISC_R_SUCCESS) {
+			goto allnodes_cleanup;
+		}
+
+		result = dns_sdlz_putnamedrr(allnodes, pd.host, pd.type, pd.ttl,
+					     pd.data);
+		if (result != ISC_R_SUCCESS) {
+			goto allnodes_cleanup;
+		}
+	} /* end while loop */
+
+allnodes_cleanup:
+
+	if (tmp != NULL) {
+		free(tmp);
+	}
+
+	/* free any memory duplicate string in the key field */
+	if (tmp_zone != NULL) {
+		free(tmp_zone);
+	}
+
+	/* get rid of zone_cursor */
+	if (zone_cursor != NULL) {
+		zone_cursor->c_close(zone_cursor);
+	}
+
+	return (result);
+}
+
+/*%
+ * Performs BDB cleanup.
+ * Used by bdb_create if there is an error starting up.
+ * Used by bdb_destroy when the driver is shutting down.
+ */
+
+static void
+bdb_cleanup(bdb_instance_t *db) {
+	isc_mem_t *mctx;
+
+	/* close databases */
+	if (db->data != NULL) {
+		db->data->close(db->data, 0);
+	}
+	if (db->host != NULL) {
+		db->host->close(db->host, 0);
+	}
+	if (db->zone != NULL) {
+		db->zone->close(db->zone, 0);
+	}
+	if (db->client != NULL) {
+		db->client->close(db->client, 0);
+	}
+
+	/* close environment */
+	if (db->dbenv != NULL) {
+		db->dbenv->close(db->dbenv, 0);
+	}
+
+	/* cleanup memory */
+	if (db->mctx != NULL) {
+		/* save mctx for later */
+		mctx = db->mctx;
+		/* return, and detach the memory */
+		isc_mem_putanddetach(&mctx, db, sizeof(bdb_instance_t));
+	}
+}
+
+static isc_result_t
+bdb_findzone(void *driverarg, void *dbdata, const char *name,
+	     dns_clientinfomethods_t *methods, dns_clientinfo_t *clientinfo) {
+	isc_result_t result;
+	bdb_instance_t *db = (bdb_instance_t *)dbdata;
+	DBC *zone_cursor = NULL;
+	DBT key, data;
+
+	UNUSED(driverarg);
+	UNUSED(methods);
+	UNUSED(clientinfo);
+
+	memset(&key, 0, sizeof(DBT));
+	memset(&data, 0, sizeof(DBT));
+	data.flags = DB_DBT_MALLOC;
+
+	key.data = strdup(name);
+
+	if (key.data == NULL) {
+		return (ISC_R_NOMEMORY);
+	}
+
+	key.size = strlen(key.data);
+
+	/* get a cursor to loop through zone data */
+	if (db->zone->cursor(db->zone, NULL, &zone_cursor, 0) != 0) {
+		result = ISC_R_NOTFOUND;
+		goto findzone_cleanup;
+	}
+
+	switch (zone_cursor->c_get(zone_cursor, &key, &data, DB_SET)) {
+	case DB_NOTFOUND:
+	case DB_SECONDARY_BAD:
+		result = ISC_R_NOTFOUND;
+		break;
+	case 0:
+		result = ISC_R_SUCCESS;
+		break;
+	default:
+		result = ISC_R_FAILURE;
+	}
+
+findzone_cleanup:
+
+	/* free any memory duplicate string in the key field */
+	if (key.data != NULL) {
+		free(key.data);
+	}
+
+	/* free any memory allocated to the data field. */
+	if (data.data != NULL) {
+		free(data.data);
+	}
+
+	/* get rid of zone_cursor */
+	if (zone_cursor != NULL) {
+		zone_cursor->c_close(zone_cursor);
+	}
+
+	return (result);
+}
+
+static isc_result_t
+bdb_lookup(const char *zone, const char *name, void *driverarg, void *dbdata,
+	   dns_sdlzlookup_t *lookup, dns_clientinfomethods_t *methods,
+	   dns_clientinfo_t *clientinfo) {
+	isc_result_t result = ISC_R_NOTFOUND;
+	bdb_instance_t *db = (bdb_instance_t *)dbdata;
+	DBC *zone_cursor = NULL;
+	DBC *host_cursor = NULL;
+	DBC *join_cursor = NULL;
+	DBT key, data;
+	DBC *cur_arr[3];
+	int bdbres;
+	parsed_data_t pd;
+	char *tmp_zone, *tmp_host = NULL;
+	char *tmp = NULL;
+
+	UNUSED(driverarg);
+	UNUSED(methods);
+	UNUSED(clientinfo);
+
+	memset(&key, 0, sizeof(DBT));
+	memset(&data, 0, sizeof(DBT));
+
+	/* set zone key */
+	key.data = tmp_zone = strdup(zone);
+	if (key.data == NULL) {
+		result = ISC_R_NOMEMORY;
+		goto lookup_cleanup;
+	}
+	key.size = strlen(key.data);
+
+	/* get a cursor to loop through zone data */
+	if (db->zone->cursor(db->zone, NULL, &zone_cursor, 0) != 0) {
+		result = ISC_R_FAILURE;
+		goto lookup_cleanup;
+	}
+
+	/* initialize zone_cursor with zone_key */
+	if (zone_cursor->c_get(zone_cursor, &key, &data, DB_SET) != 0) {
+		result = ISC_R_NOTFOUND;
+		goto lookup_cleanup;
+	}
+
+	/* set host key */
+	key.data = tmp_host = strdup(name);
+	if (key.data == NULL) {
+		result = ISC_R_NOMEMORY;
+		goto lookup_cleanup;
+	}
+	key.size = strlen(key.data);
+
+	/* get a cursor to loop through host data */
+	if (db->host->cursor(db->host, NULL, &host_cursor, 0) != 0) {
+		result = ISC_R_FAILURE;
+		goto lookup_cleanup;
+	}
+
+	/* initialize host_cursor with host_key */
+	if (host_cursor->c_get(host_cursor, &key, &data, DB_SET) != 0) {
+		result = ISC_R_NOTFOUND;
+		goto lookup_cleanup;
+	}
+
+	cur_arr[0] = zone_cursor;
+	cur_arr[1] = host_cursor;
+	cur_arr[2] = NULL;
+
+	db->data->join(db->data, cur_arr, &join_cursor, 0);
+
+	while ((bdbres = join_cursor->c_get(join_cursor, &key, &data, 0)) == 0)
+	{
+		tmp = realloc(tmp, data.size + 1);
+		if (tmp == NULL) {
+			goto lookup_cleanup;
+		}
+
+		strncpy(tmp, data.data, data.size);
+		tmp[data.size] = '\0';
+
+		if (bdb_parse_data(tmp, &pd) != ISC_R_SUCCESS) {
+			goto lookup_cleanup;
+		}
+
+		result = dns_sdlz_putrr(lookup, pd.type, pd.ttl, pd.data);
+
+		if (result != ISC_R_SUCCESS) {
+			goto lookup_cleanup;
+		}
+	} /* end while loop */
+
+lookup_cleanup:
+
+	if (tmp != NULL) {
+		free(tmp);
+	}
+	if (tmp_zone != NULL) {
+		free(tmp_zone);
+	}
+	if (tmp_host != NULL) {
+		free(tmp_host);
+	}
+
+	/* get rid of the joined cusor */
+	if (join_cursor != NULL) {
+		join_cursor->c_close(join_cursor);
+	}
+
+	/* get rid of zone_cursor */
+	if (zone_cursor != NULL) {
+		zone_cursor->c_close(zone_cursor);
+	}
+
+	/* get rid of host_cursor */
+	if (host_cursor != NULL) {
+		host_cursor->c_close(host_cursor);
+	}
+
+	return (result);
+}
+
+/*% Initializes, sets flags and then opens Berkeley databases. */
+
+static isc_result_t
+bdb_opendb(DB_ENV *db_env, DBTYPE db_type, DB **db, const char *db_name,
+	   char *db_file, int flags) {
+	int result;
+
+	/* Initialize the database. */
+	if ((result = db_create(db, db_env, 0)) != 0) {
+		isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
+			      DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
+			      "BDB could not initialize %s database. "
+			      "BDB error: %s",
+			      db_name, db_strerror(result));
+		return (ISC_R_FAILURE);
+	}
+
+	/* set database flags. */
+	if ((result = (*db)->set_flags(*db, flags)) != 0) {
+		isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
+			      DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
+			      "BDB could not set flags for %s database. "
+			      "BDB error: %s",
+			      db_name, db_strerror(result));
+		return (ISC_R_FAILURE);
+	}
+
+	/* open the database. */
+	if ((result = (*db)->open(*db, NULL, db_file, db_name, db_type,
+				  DB_RDONLY | bdb_threads, 0)) != 0)
+	{
+		isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
+			      DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
+			      "BDB could not open %s database in %s. "
+			      "BDB error: %s",
+			      db_name, db_file, db_strerror(result));
+		return (ISC_R_FAILURE);
+	}
+
+	return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+bdb_create(const char *dlzname, unsigned int argc, char *argv[],
+	   void *driverarg, void **dbdata) {
+	isc_result_t result;
+	int bdbres;
+	bdb_instance_t *db = NULL;
+
+	UNUSED(dlzname);
+	UNUSED(driverarg);
+
+	/* verify we have 3 arg's passed to the driver */
+	if (argc != 3) {
+		isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
+			      DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
+			      "Berkeley DB driver requires at least "
+			      "2 command line args.");
+		return (ISC_R_FAILURE);
+	}
+
+	/* allocate and zero memory for driver structure */
+	db = isc_mem_get(named_g_mctx, sizeof(bdb_instance_t));
+	memset(db, 0, sizeof(bdb_instance_t));
+
+	/* attach to the memory context */
+	isc_mem_attach(named_g_mctx, &db->mctx);
+
+	/* create BDB environment
+	 * Basically BDB allocates and assigns memory to db->dbenv
+	 */
+	bdbres = db_env_create(&db->dbenv, 0);
+	if (bdbres != 0) {
+		isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
+			      DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
+			      "BDB environment could not be created. "
+			      "BDB error: %s",
+			      db_strerror(bdbres));
+		result = ISC_R_FAILURE;
+		goto init_cleanup;
+	}
+
+	/* open BDB environment */
+	bdbres = db->dbenv->open(
+		db->dbenv, argv[1],
+		DB_INIT_CDB | DB_INIT_MPOOL | bdb_threads | DB_CREATE, 0);
+	if (bdbres != 0) {
+		isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
+			      DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
+			      "BDB environment at '%s' could not be opened. "
+			      "BDB error: %s",
+			      argv[1], db_strerror(bdbres));
+		result = ISC_R_FAILURE;
+		goto init_cleanup;
+	}
+
+	/* open dlz_data database. */
+	result = bdb_opendb(db->dbenv, DB_UNKNOWN, &db->data, dlz_data, argv[2],
+			    0);
+	if (result != ISC_R_SUCCESS) {
+		goto init_cleanup;
+	}
+
+	/* open dlz_host database. */
+	result = bdb_opendb(db->dbenv, DB_UNKNOWN, &db->host, dlz_host, argv[2],
+			    DB_DUP | DB_DUPSORT);
+	if (result != ISC_R_SUCCESS) {
+		goto init_cleanup;
+	}
+
+	/* open dlz_zone database. */
+	result = bdb_opendb(db->dbenv, DB_UNKNOWN, &db->zone, dlz_zone, argv[2],
+			    DB_DUP | DB_DUPSORT);
+	if (result != ISC_R_SUCCESS) {
+		goto init_cleanup;
+	}
+
+	/* open dlz_client database. */
+	result = bdb_opendb(db->dbenv, DB_UNKNOWN, &db->client, dlz_client,
+			    argv[2], DB_DUP | DB_DUPSORT);
+	if (result != ISC_R_SUCCESS) {
+		goto init_cleanup;
+	}
+
+	/* associate the host secondary database with the primary database */
+	bdbres = db->data->associate(db->data, NULL, db->host, NULL, 0);
+	if (bdbres != 0) {
+		isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
+			      DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
+			      "BDB could not associate %s database with %s. "
+			      "BDB error: %s",
+			      dlz_host, dlz_data, db_strerror(bdbres));
+		result = ISC_R_FAILURE;
+		goto init_cleanup;
+	}
+
+	/* associate the zone secondary database with the primary database */
+	bdbres = db->data->associate(db->data, NULL, db->zone, NULL, 0);
+	if (bdbres != 0) {
+		isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
+			      DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
+			      "BDB could not associate %s database with %s. "
+			      "BDB error: %s",
+			      dlz_zone, dlz_data, db_strerror(bdbres));
+		result = ISC_R_FAILURE;
+		goto init_cleanup;
+	}
+
+	*dbdata = db;
+
+	return (ISC_R_SUCCESS);
+
+init_cleanup:
+
+	bdb_cleanup(db);
+	return (result);
+}
+
+static void
+bdb_destroy(void *driverarg, void *dbdata) {
+	UNUSED(driverarg);
+
+	bdb_cleanup((bdb_instance_t *)dbdata);
+}
+
+/* bdb_authority not needed as authority data is returned by lookup */
+static dns_sdlzmethods_t dlz_bdb_methods = {
+	bdb_create,
+	bdb_destroy,
+	bdb_findzone,
+	bdb_lookup,
+	NULL,
+	bdb_allnodes,
+	bdb_allowzonexfr,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+	NULL,
+};
+
+/*%
+ * Wrapper around dns_sdlzregister().
+ */
+isc_result_t
+dlz_bdb_init(void) {
+	isc_result_t result;
+
+	/*
+	 * Write debugging message to log
+	 */
+	isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE, DNS_LOGMODULE_DLZ,
+		      ISC_LOG_DEBUG(2), "Registering DLZ bdb driver.");
+
+	result = dns_sdlzregister("bdb", &dlz_bdb_methods, NULL,
+				  DNS_SDLZFLAG_RELATIVEOWNER |
+					  DNS_SDLZFLAG_RELATIVERDATA |
+					  DNS_SDLZFLAG_THREADSAFE,
+				  named_g_mctx, &dlz_bdb);
+	if (result != ISC_R_SUCCESS) {
+		UNEXPECTED_ERROR(__FILE__, __LINE__,
+				 "dns_sdlzregister() failed: %s",
+				 isc_result_totext(result));
+		result = ISC_R_UNEXPECTED;
+	}
+
+	return (result);
+}
+
+/*%
+ * Wrapper around dns_sdlzunregister().
+ */
+void
+dlz_bdb_clear(void) {
+	/*
+	 * Write debugging message to log
+	 */
+	isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE, DNS_LOGMODULE_DLZ,
+		      ISC_LOG_DEBUG(2), "Unregistering DLZ bdb driver.");
+
+	if (dlz_bdb != NULL) {
+		dns_sdlzunregister(&dlz_bdb);
+	}
+}
+
+#endif /* ifdef DLZ_BDB */