Adding upstream version 1:9.11.5.P4+dfsg.upstream/1%9.11.5.P4+dfsgupstream

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

1 files changed, 822 insertions, 0 deletions

diff --git a/bin/tests/system/dyndb/driver/db.c b/bin/tests/system/dyndb/driver/db.c
new file mode 100644
index 0000000..02aa6ab
--- /dev/null
+++ b/bin/tests/system/dyndb/driver/db.c
@@ -0,0 +1,822 @@
+/*
+ * Database API implementation. The interface is defined in lib/dns/db.h.
+ *
+ * dns_db_*() calls on database instances backed by this driver use
+ * struct sampledb_methods to find appropriate function implementation.
+ *
+ * This example re-uses RBT DB implementation from original BIND and blindly
+ * proxies most of dns_db_*() calls to this underlying RBT DB.
+ * See struct sampledb below.
+ *
+ * Copyright (C) 2009-2015  Red Hat ; see COPYRIGHT for license
+ */
+#include <config.h>
+
+#include <inttypes.h>
+#include <stdbool.h>
+
+#include <isc/string.h>
+#include <isc/util.h>
+
+#include <dns/db.h>
+#include <dns/diff.h>
+#include <dns/enumclass.h>
+#include <dns/rbt.h>
+#include <dns/rdatalist.h>
+#include <dns/rdatastruct.h>
+#include <dns/soa.h>
+#include <dns/types.h>
+
+#include "db.h"
+#include "instance.h"
+#include "syncptr.h"
+#include "util.h"
+
+#define SAMPLEDB_MAGIC			ISC_MAGIC('S', 'M', 'D', 'B')
+#define VALID_SAMPLEDB(sampledb) \
+	((sampledb) != NULL && (sampledb)->common.impmagic == SAMPLEDB_MAGIC)
+
+struct sampledb {
+	dns_db_t			common;
+	isc_refcount_t			refs;
+	sample_instance_t		*inst;
+
+	/*
+	 * Internal RBT database implementation provided by BIND.
+	 * Most dns_db_* calls (find(), createiterator(), etc.)
+	 * are blindly forwarded to this RBT DB.
+	 */
+	dns_db_t			*rbtdb;
+};
+
+typedef struct sampledb sampledb_t;
+
+/*
+ * Get full DNS name from the node.
+ *
+ * @warning
+ * The code silently expects that "node" came from RBTDB and thus
+ * assumption dns_dbnode_t (from RBTDB) == dns_rbtnode_t is correct.
+ *
+ * This should work as long as we use only RBTDB and nothing else.
+ */
+static isc_result_t
+sample_name_fromnode(dns_dbnode_t *node, dns_name_t *name) {
+	dns_rbtnode_t *rbtnode = (dns_rbtnode_t *) node;
+	return (dns_rbt_fullnamefromnode(rbtnode, name));
+}
+
+static void
+attach(dns_db_t *source, dns_db_t **targetp) {
+	sampledb_t *sampledb = (sampledb_t *)source;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	isc_refcount_increment(&sampledb->refs, NULL);
+	*targetp = source;
+}
+
+static void
+free_sampledb(sampledb_t *sampledb) {
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	dns_db_detach(&sampledb->rbtdb);
+	dns_name_free(&sampledb->common.origin, sampledb->common.mctx);
+	isc_mem_putanddetach(&sampledb->common.mctx, sampledb, sizeof(*sampledb));
+}
+
+static void
+detach(dns_db_t **dbp) {
+	sampledb_t *sampledb = (sampledb_t *)(*dbp);
+	unsigned int refs;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	isc_refcount_decrement(&sampledb->refs, &refs);
+	if (refs == 0)
+		free_sampledb(sampledb);
+	*dbp = NULL;
+}
+
+/*
+ * This method should never be called, because DB is "persistent".
+ * See ispersistent() function. It means that database do not need to be
+ * loaded in the usual sense.
+ */
+static isc_result_t
+beginload(dns_db_t *db, dns_rdatacallbacks_t *callbacks) {
+	UNUSED(db);
+	UNUSED(callbacks);
+
+	fatal_error("current implementation should never call beginload()");
+
+	/* Not reached */
+	return (ISC_R_SUCCESS);
+}
+
+/*
+ * This method should never be called, because DB is "persistent".
+ * See ispersistent() function. It means that database do not need to be
+ * loaded in the usual sense.
+ */
+static isc_result_t
+endload(dns_db_t *db, dns_rdatacallbacks_t *callbacks) {
+	UNUSED(db);
+	UNUSED(callbacks);
+
+	fatal_error("current implementation should never call endload()");
+
+	/* Not reached */
+	return (ISC_R_SUCCESS);
+}
+
+static isc_result_t
+serialize(dns_db_t *db, dns_dbversion_t *version, FILE *file) {
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	return (dns_db_serialize(sampledb->rbtdb, version, file));
+}
+
+static isc_result_t
+dump(dns_db_t *db, dns_dbversion_t *version, const char *filename,
+     dns_masterformat_t masterformat)
+{
+
+	UNUSED(db);
+	UNUSED(version);
+	UNUSED(filename);
+	UNUSED(masterformat);
+
+	fatal_error("current implementation should never call dump()");
+
+	/* Not reached */
+	return (ISC_R_SUCCESS);
+}
+
+static void
+currentversion(dns_db_t *db, dns_dbversion_t **versionp) {
+	sampledb_t *sampledb = (sampledb_t *)db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	dns_db_currentversion(sampledb->rbtdb, versionp);
+}
+
+static isc_result_t
+newversion(dns_db_t *db, dns_dbversion_t **versionp) {
+	sampledb_t *sampledb = (sampledb_t *)db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	return (dns_db_newversion(sampledb->rbtdb, versionp));
+}
+
+static void
+attachversion(dns_db_t *db, dns_dbversion_t *source,
+	      dns_dbversion_t **targetp)
+{
+	sampledb_t *sampledb = (sampledb_t *)db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	dns_db_attachversion(sampledb->rbtdb, source, targetp);
+}
+
+static void
+closeversion(dns_db_t *db, dns_dbversion_t **versionp, bool commit) {
+	sampledb_t *sampledb = (sampledb_t *)db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	dns_db_closeversion(sampledb->rbtdb, versionp, commit);
+}
+
+static isc_result_t
+findnode(dns_db_t *db, dns_name_t *name, bool create,
+	 dns_dbnode_t **nodep)
+{
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	return (dns_db_findnode(sampledb->rbtdb, name, create, nodep));
+}
+
+static isc_result_t
+find(dns_db_t *db, dns_name_t *name, dns_dbversion_t *version,
+     dns_rdatatype_t type, unsigned int options, isc_stdtime_t now,
+     dns_dbnode_t **nodep, dns_name_t *foundname, dns_rdataset_t *rdataset,
+     dns_rdataset_t *sigrdataset)
+{
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	return (dns_db_find(sampledb->rbtdb, name, version, type,
+			    options, now, nodep, foundname,
+			    rdataset, sigrdataset));
+}
+
+static isc_result_t
+findzonecut(dns_db_t *db, dns_name_t *name, unsigned int options,
+	    isc_stdtime_t now, dns_dbnode_t **nodep, dns_name_t *foundname,
+	    dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset)
+{
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	return (dns_db_findzonecut(sampledb->rbtdb, name, options,
+				   now, nodep, foundname, rdataset,
+				   sigrdataset));
+}
+
+static void
+attachnode(dns_db_t *db, dns_dbnode_t *source, dns_dbnode_t **targetp) {
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	dns_db_attachnode(sampledb->rbtdb, source, targetp);
+
+}
+
+static void
+detachnode(dns_db_t *db, dns_dbnode_t **targetp) {
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	dns_db_detachnode(sampledb->rbtdb, targetp);
+}
+
+static isc_result_t
+expirenode(dns_db_t *db, dns_dbnode_t *node, isc_stdtime_t now) {
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	return (dns_db_expirenode(sampledb->rbtdb, node, now));
+}
+
+static void
+printnode(dns_db_t *db, dns_dbnode_t *node, FILE *out) {
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	dns_db_printnode(sampledb->rbtdb, node, out);
+}
+
+static isc_result_t
+createiterator(dns_db_t *db, unsigned int options,
+	       dns_dbiterator_t **iteratorp)
+{
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	return (dns_db_createiterator(sampledb->rbtdb, options, iteratorp));
+}
+
+static isc_result_t
+findrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
+	     dns_rdatatype_t type, dns_rdatatype_t covers, isc_stdtime_t now,
+	     dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset)
+{
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	return (dns_db_findrdataset(sampledb->rbtdb, node, version, type,
+				    covers, now, rdataset, sigrdataset));
+}
+
+static isc_result_t
+allrdatasets(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
+	     isc_stdtime_t now, dns_rdatasetiter_t **iteratorp)
+{
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	return (dns_db_allrdatasets(sampledb->rbtdb, node, version,
+				    now, iteratorp));
+}
+
+static isc_result_t
+addrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
+	    isc_stdtime_t now, dns_rdataset_t *rdataset, unsigned int options,
+	    dns_rdataset_t *addedrdataset)
+{
+	sampledb_t *sampledb = (sampledb_t *) db;
+	isc_result_t result;
+	dns_fixedname_t name;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	dns_fixedname_init(&name);
+	CHECK(dns_db_addrdataset(sampledb->rbtdb, node, version, now,
+				 rdataset, options, addedrdataset));
+	if (rdataset->type == dns_rdatatype_a ||
+	    rdataset->type == dns_rdatatype_aaaa) {
+		CHECK(sample_name_fromnode(node, dns_fixedname_name(&name)));
+		CHECK(syncptrs(sampledb->inst, dns_fixedname_name(&name),
+			       rdataset, DNS_DIFFOP_ADD));
+	}
+
+cleanup:
+	return (result);
+}
+
+static isc_result_t
+subtractrdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
+		 dns_rdataset_t *rdataset, unsigned int options,
+		 dns_rdataset_t *newrdataset)
+{
+	sampledb_t *sampledb = (sampledb_t *) db;
+	isc_result_t result;
+	dns_fixedname_t name;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	dns_fixedname_init(&name);
+	result = dns_db_subtractrdataset(sampledb->rbtdb, node, version,
+					 rdataset, options, newrdataset);
+	if (result != ISC_R_SUCCESS && result != DNS_R_NXRRSET)
+		goto cleanup;
+
+	if (rdataset->type == dns_rdatatype_a ||
+	    rdataset->type == dns_rdatatype_aaaa) {
+		CHECK(sample_name_fromnode(node, dns_fixedname_name(&name)));
+		CHECK(syncptrs(sampledb->inst, dns_fixedname_name(&name),
+			       rdataset, DNS_DIFFOP_DEL));
+	}
+
+cleanup:
+	return (result);
+}
+
+/*
+ * deleterdataset() function is not used during DNS update processing so syncptr
+ * implementation is left as an exercise to the reader.
+ */
+static isc_result_t
+deleterdataset(dns_db_t *db, dns_dbnode_t *node, dns_dbversion_t *version,
+	       dns_rdatatype_t type, dns_rdatatype_t covers)
+{
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	return (dns_db_deleterdataset(sampledb->rbtdb, node, version,
+				      type, covers));
+}
+
+static bool
+issecure(dns_db_t *db) {
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	return (dns_db_issecure(sampledb->rbtdb));
+}
+
+static unsigned int
+nodecount(dns_db_t *db) {
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	return (dns_db_nodecount(sampledb->rbtdb));
+}
+
+/*
+ * The database does not need to be loaded from disk or written to disk.
+ * Always return true.
+ */
+static bool
+ispersistent(dns_db_t *db) {
+	UNUSED(db);
+
+	return (true);
+}
+
+static void
+overmem(dns_db_t *db, bool over) {
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	dns_db_overmem(sampledb->rbtdb, over);
+}
+
+static void
+settask(dns_db_t *db, isc_task_t *task) {
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	dns_db_settask(sampledb->rbtdb, task);
+}
+
+static isc_result_t
+getoriginnode(dns_db_t *db, dns_dbnode_t **nodep) {
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	return (dns_db_getoriginnode(sampledb->rbtdb, nodep));
+}
+
+static void
+transfernode(dns_db_t *db, dns_dbnode_t **sourcep, dns_dbnode_t **targetp) {
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	dns_db_transfernode(sampledb->rbtdb, sourcep, targetp);
+
+}
+
+static isc_result_t
+getnsec3parameters(dns_db_t *db, dns_dbversion_t *version,
+		   dns_hash_t *hash, uint8_t *flags,
+		   uint16_t *iterations,
+		   unsigned char *salt, size_t *salt_length)
+{
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	return (dns_db_getnsec3parameters(sampledb->rbtdb, version,
+					  hash, flags, iterations,
+					  salt, salt_length));
+
+}
+
+static isc_result_t
+findnsec3node(dns_db_t *db, dns_name_t *name, bool create,
+	      dns_dbnode_t **nodep)
+{
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	return (dns_db_findnsec3node(sampledb->rbtdb, name, create, nodep));
+}
+
+static isc_result_t
+setsigningtime(dns_db_t *db, dns_rdataset_t *rdataset, isc_stdtime_t resign) {
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	return (dns_db_setsigningtime(sampledb->rbtdb, rdataset, resign));
+}
+
+static isc_result_t
+getsigningtime(dns_db_t *db, dns_rdataset_t *rdataset, dns_name_t *name) {
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	return (dns_db_getsigningtime(sampledb->rbtdb, rdataset, name));
+}
+
+static void
+resigned(dns_db_t *db, dns_rdataset_t *rdataset, dns_dbversion_t *version) {
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	dns_db_resigned(sampledb->rbtdb, rdataset, version);
+}
+
+static bool
+isdnssec(dns_db_t *db) {
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	return (dns_db_isdnssec(sampledb->rbtdb));
+}
+
+static dns_stats_t *
+getrrsetstats(dns_db_t *db) {
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	return (dns_db_getrrsetstats(sampledb->rbtdb));
+
+}
+
+static void
+rpz_attach(dns_db_t *db, dns_rpz_zones_t *rpzs, dns_rpz_num_t rpz_num) {
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	dns_db_rpz_attach(sampledb->rbtdb, rpzs, rpz_num);
+}
+
+static isc_result_t
+rpz_ready(dns_db_t *db) {
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	return (dns_db_rpz_ready(sampledb->rbtdb));
+}
+
+static isc_result_t
+findnodeext(dns_db_t *db, dns_name_t *name,
+	    bool create, dns_clientinfomethods_t *methods,
+	    dns_clientinfo_t *clientinfo, dns_dbnode_t **nodep)
+{
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	return (dns_db_findnodeext(sampledb->rbtdb, name, create,
+				   methods, clientinfo, nodep));
+}
+
+static isc_result_t
+findext(dns_db_t *db, dns_name_t *name, dns_dbversion_t *version,
+	dns_rdatatype_t type, unsigned int options, isc_stdtime_t now,
+	dns_dbnode_t **nodep, dns_name_t *foundname,
+	dns_clientinfomethods_t *methods, dns_clientinfo_t *clientinfo,
+	dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset)
+{
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	return (dns_db_findext(sampledb->rbtdb, name, version, type,
+			       options, now, nodep, foundname, methods,
+			       clientinfo, rdataset, sigrdataset));
+}
+
+static isc_result_t
+setcachestats(dns_db_t *db, isc_stats_t *stats) {
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	return (dns_db_setcachestats(sampledb->rbtdb, stats));
+}
+
+static size_t
+hashsize(dns_db_t *db) {
+	sampledb_t *sampledb = (sampledb_t *) db;
+
+	REQUIRE(VALID_SAMPLEDB(sampledb));
+
+	return (dns_db_hashsize(sampledb->rbtdb));
+}
+
+/*
+ * DB interface definition. Database driver uses this structure to
+ * determine which implementation of dns_db_*() function to call.
+ */
+static dns_dbmethods_t sampledb_methods = {
+	attach,
+	detach,
+	beginload,
+	endload,
+	serialize,
+	dump,
+	currentversion,
+	newversion,
+	attachversion,
+	closeversion,
+	findnode,
+	find,
+	findzonecut,
+	attachnode,
+	detachnode,
+	expirenode,
+	printnode,
+	createiterator,
+	findrdataset,
+	allrdatasets,
+	addrdataset,
+	subtractrdataset,
+	deleterdataset,
+	issecure,
+	nodecount,
+	ispersistent,
+	overmem,
+	settask,
+	getoriginnode,
+	transfernode,
+	getnsec3parameters,
+	findnsec3node,
+	setsigningtime,
+	getsigningtime,
+	resigned,
+	isdnssec,
+	getrrsetstats,
+	rpz_attach,
+	rpz_ready,
+	findnodeext,
+	findext,
+	setcachestats,
+	hashsize,
+	NULL,
+	NULL,
+};
+
+/* Auxiliary driver functions. */
+
+/*
+ * Auxiliary functions add_*() create minimal database which can be loaded.
+ * This is necessary because this driver create empty 'fake' zone which
+ * is not loaded from disk so there is no way for user to supply SOA, NS and A
+ * records.
+ *
+ * Following functions were copied from BIND 9.10.2rc1 named/server.c,
+ * credit goes to ISC.
+ */
+static isc_result_t
+add_soa(dns_db_t *db, dns_dbversion_t *version, dns_name_t *name,
+	dns_name_t *origin, dns_name_t *contact)
+{
+	dns_dbnode_t *node = NULL;
+	dns_rdata_t rdata = DNS_RDATA_INIT;
+	dns_rdatalist_t rdatalist;
+	dns_rdataset_t rdataset;
+	isc_result_t result;
+	unsigned char buf[DNS_SOA_BUFFERSIZE];
+
+	dns_rdataset_init(&rdataset);
+	dns_rdatalist_init(&rdatalist);
+	CHECK(dns_soa_buildrdata(origin, contact, dns_db_class(db),
+				 0, 28800, 7200, 604800, 86400, buf, &rdata));
+	rdatalist.type = rdata.type;
+	rdatalist.covers = 0;
+	rdatalist.rdclass = rdata.rdclass;
+	rdatalist.ttl = 86400;
+	ISC_LIST_APPEND(rdatalist.rdata, &rdata, link);
+	CHECK(dns_rdatalist_tordataset(&rdatalist, &rdataset));
+	CHECK(dns_db_findnode(db, name, true, &node));
+	CHECK(dns_db_addrdataset(db, node, version, 0, &rdataset, 0, NULL));
+ cleanup:
+	if (node != NULL)
+		dns_db_detachnode(db, &node);
+	return (result);
+}
+
+
+static isc_result_t
+add_ns(dns_db_t *db, dns_dbversion_t *version, dns_name_t *name,
+       dns_name_t *nsname)
+{
+	dns_dbnode_t *node = NULL;
+	dns_rdata_ns_t ns;
+	dns_rdata_t rdata = DNS_RDATA_INIT;
+	dns_rdatalist_t rdatalist;
+	dns_rdataset_t rdataset;
+	isc_result_t result;
+	isc_buffer_t b;
+	unsigned char buf[DNS_NAME_MAXWIRE];
+
+	isc_buffer_init(&b, buf, sizeof(buf));
+
+	dns_rdataset_init(&rdataset);
+	dns_rdatalist_init(&rdatalist);
+	ns.common.rdtype = dns_rdatatype_ns;
+	ns.common.rdclass = dns_db_class(db);
+	ns.mctx = NULL;
+	dns_name_init(&ns.name, NULL);
+	dns_name_clone(nsname, &ns.name);
+	CHECK(dns_rdata_fromstruct(&rdata, dns_db_class(db), dns_rdatatype_ns,
+				   &ns, &b));
+	rdatalist.type = rdata.type;
+	rdatalist.covers = 0;
+	rdatalist.rdclass = rdata.rdclass;
+	rdatalist.ttl = 86400;
+	ISC_LIST_APPEND(rdatalist.rdata, &rdata, link);
+	CHECK(dns_rdatalist_tordataset(&rdatalist, &rdataset));
+	CHECK(dns_db_findnode(db, name, true, &node));
+	CHECK(dns_db_addrdataset(db, node, version, 0, &rdataset, 0, NULL));
+ cleanup:
+	if (node != NULL)
+		dns_db_detachnode(db, &node);
+	return (result);
+}
+
+static isc_result_t
+add_a(dns_db_t *db, dns_dbversion_t *version, dns_name_t *name,
+      struct in_addr addr)
+{
+	dns_dbnode_t *node = NULL;
+	dns_rdata_in_a_t a;
+	dns_rdata_t rdata = DNS_RDATA_INIT;
+	dns_rdatalist_t rdatalist;
+	dns_rdataset_t rdataset;
+	isc_result_t result;
+	isc_buffer_t b;
+	unsigned char buf[DNS_NAME_MAXWIRE];
+
+	isc_buffer_init(&b, buf, sizeof(buf));
+
+	dns_rdataset_init(&rdataset);
+	dns_rdatalist_init(&rdatalist);
+	a.common.rdtype = dns_rdatatype_a;
+	a.common.rdclass = dns_db_class(db);
+	a.in_addr = addr;
+	CHECK(dns_rdata_fromstruct(&rdata, dns_db_class(db), dns_rdatatype_a,
+				   &a, &b));
+	rdatalist.type = rdata.type;
+	rdatalist.covers = 0;
+	rdatalist.rdclass = rdata.rdclass;
+	rdatalist.ttl = 86400;
+	ISC_LIST_APPEND(rdatalist.rdata, &rdata, link);
+	CHECK(dns_rdatalist_tordataset(&rdatalist, &rdataset));
+	CHECK(dns_db_findnode(db, name, true, &node));
+	CHECK(dns_db_addrdataset(db, node, version, 0, &rdataset, 0, NULL));
+ cleanup:
+	if (node != NULL)
+		dns_db_detachnode(db, &node);
+	return (result);
+}
+
+/*
+ * Driver-specific implementation of dns_db_create().
+ *
+ * @param[in] argv      Database-specific parameters from dns_db_create().
+ * @param[in] driverarg Driver-specific parameter from dns_db_register().
+ */
+isc_result_t
+create_db(isc_mem_t *mctx, dns_name_t *origin, dns_dbtype_t type,
+	  dns_rdataclass_t rdclass, unsigned int argc, char *argv[],
+	  void *driverarg, dns_db_t **dbp)
+{
+	sampledb_t *sampledb = NULL;
+	isc_result_t result;
+	dns_dbversion_t *version = NULL;
+	struct in_addr a_addr;
+
+	REQUIRE(type == dns_dbtype_zone);
+	REQUIRE(rdclass == dns_rdataclass_in);
+	REQUIRE(argc == 0);
+	REQUIRE(argv != NULL);
+	REQUIRE(driverarg != NULL); /* pointer to driver instance */
+	REQUIRE(dbp != NULL && *dbp == NULL);
+
+	UNUSED(driverarg); /* no driver-specific configuration */
+
+	a_addr.s_addr = 0x0100007fU;
+
+	CHECKED_MEM_GET_PTR(mctx, sampledb);
+	ZERO_PTR(sampledb);
+
+	isc_mem_attach(mctx, &sampledb->common.mctx);
+	dns_name_init(&sampledb->common.origin, NULL);
+	isc_ondestroy_init(&sampledb->common.ondest);
+
+	sampledb->common.magic = DNS_DB_MAGIC;
+	sampledb->common.impmagic = SAMPLEDB_MAGIC;
+
+	sampledb->common.methods = &sampledb_methods;
+	sampledb->common.attributes = 0;
+	sampledb->common.rdclass = rdclass;
+
+	CHECK(dns_name_dupwithoffsets(origin, mctx, &sampledb->common.origin));
+
+	CHECK(isc_refcount_init(&sampledb->refs, 1));
+
+	/* Translate instance name to instance pointer. */
+	sampledb->inst = driverarg;
+
+	/* Create internal instance of RBT DB implementation from BIND. */
+	CHECK(dns_db_create(mctx, "rbt", origin, dns_dbtype_zone,
+			    dns_rdataclass_in, 0, NULL, &sampledb->rbtdb));
+
+	/* Create fake SOA, NS, and A records to make database loadable. */
+	CHECK(dns_db_newversion(sampledb->rbtdb, &version));
+	CHECK(add_soa(sampledb->rbtdb, version, origin, origin, origin));
+	CHECK(add_ns(sampledb->rbtdb, version, origin, origin));
+	CHECK(add_a(sampledb->rbtdb, version, origin, a_addr));
+	dns_db_closeversion(sampledb->rbtdb, &version, true);
+
+	*dbp = (dns_db_t *)sampledb;
+
+	return (ISC_R_SUCCESS);
+
+cleanup:
+	if (sampledb != NULL) {
+		if (dns_name_dynamic(&sampledb->common.origin))
+			dns_name_free(&sampledb->common.origin, mctx);
+
+		isc_mem_putanddetach(&sampledb->common.mctx, sampledb,
+				     sizeof(*sampledb));
+	}
+
+	return (result);
+}