4424. [experimental] Named now sends _ta-XXXX.<trust-anchor>/NULL queries

                        to provide feedback to the trust-anchor administrators
                        about how key rollovers are progressing as per
                        draft-ietf-dnsop-edns-key-tag-02.  This can be
                        disabled using 'trust-anchor-telemetry no;'.
                        [RT #40583]

CHANGES

+4424.	[experimental]	Named now sends _ta-XXXX.<trust-anchor>/NULL queries
+			to provide feedback to the trust-anchor administrators
+			about how key rollovers are progressing as per
+			draft-ietf-dnsop-edns-key-tag-02.  This can be
+			disabled using 'trust-anchor-telemetry no;'.
+			[RT #40583]
+
 4423.	[maint]		Added missing IPv6 address 2001:500:84::b for
 			B.ROOT-SERVERS.NET. [RT #42898]
 

bin/named/config.c

@@ -109,6 +109,7 @@ options {\n\
 	transfers-in 10;\n\
 	transfers-out 10;\n\
 #	treat-cr-as-space <obsolete>;\n\
+	trust-anchor-telemetry yes;\n\
 #	use-id-pool <obsolete>;\n\
 #	use-ixfr <obsolete>;\n\
 	edns-udp-size 4096;\n\

bin/named/include/named/globals.h

@@ -176,6 +176,7 @@ EXTERN isc_boolean_t		ns_g_nonearest		INIT(ISC_FALSE);
 EXTERN isc_boolean_t		ns_g_notcp		INIT(ISC_FALSE);
 EXTERN isc_boolean_t		ns_g_disable6		INIT(ISC_FALSE);
 EXTERN isc_boolean_t		ns_g_disable4		INIT(ISC_FALSE);
+EXTERN unsigned int		ns_g_tat_interval	INIT(24*3600);
 
 #ifdef HAVE_GEOIP
 EXTERN dns_geoip_databases_t	*ns_g_geoip		INIT(NULL);

bin/named/include/named/server.h

@@ -76,6 +76,7 @@ struct ns_server {
 	isc_timer_t *		interface_timer;
 	isc_timer_t *		heartbeat_timer;
 	isc_timer_t *		pps_timer;
+	isc_timer_t *		tat_timer;
 
 	isc_uint32_t		interface_interval;
 	isc_uint32_t		heartbeat_interval;

bin/named/main.c

@@ -640,6 +640,9 @@ parse_command_line(int argc, char *argv[]) {
 					ns_main_earlyfatal("bad mkeytimer");
 			} else if (!strcmp(isc_commandline_argument, "notcp"))
 				ns_g_notcp = ISC_TRUE;
+			else if (!strncmp(isc_commandline_argument, "tat=", 4))
+				ns_g_tat_interval =
+					   atoi(isc_commandline_argument + 4);
 			else
 				fprintf(stderr, "unknown -T flag '%s\n",
 					isc_commandline_argument);

bin/named/server.c

@@ -4103,6 +4103,11 @@ configure_view(dns_view_t *view, dns_viewlist_t *viewlist,
 	else
 		INSIST(0);
 
+	obj = NULL;
+	result = ns_config_get(maps, "trust-anchor-telemetry", &obj);
+	INSIST(result == ISC_R_SUCCESS);
+	view->trust_anchor_telemetry = cfg_obj_asboolean(obj);
+
 	/*
 	 * Set sources where additional data and CNAME/DNAME
 	 * targets for authoritative answers may be found.
@@ -5834,6 +5839,186 @@ heartbeat_timer_tick(isc_task_t *task, isc_event_t *event) {
 	}
 }
 
+typedef struct {
+       isc_mem_t       *mctx;
+       isc_task_t      *task;
+       dns_rdataset_t  rdataset;
+       dns_rdataset_t  sigrdataset;
+       dns_fetch_t     *fetch;
+} ns_tat_t;
+
+static int
+cid(const void *a, const void *b) {
+	const isc_uint16_t ida = *(const isc_uint16_t *)a;
+	const isc_uint16_t idb = *(const isc_uint16_t *)b;
+	if (ida < idb)
+		return (-1);
+	else if (ida > idb)
+		return (1);
+	else
+		return (0);
+}
+
+static void
+tat_done(isc_task_t *task, isc_event_t *event) {
+	dns_fetchevent_t *devent;
+	ns_tat_t *tat;
+
+	UNUSED(task);
+	INSIST(event != NULL && event->ev_type == DNS_EVENT_FETCHDONE);
+	INSIST(event->ev_arg != NULL);
+
+	tat = event->ev_arg;
+	devent = (dns_fetchevent_t *) event;
+
+	/* Free resources which are not of interest */
+	if (devent->node != NULL)
+		dns_db_detachnode(devent->db, &devent->node);
+	if (devent->db != NULL)
+		dns_db_detach(&devent->db);
+	isc_event_free(&event);
+	dns_resolver_destroyfetch(&tat->fetch);
+	if (dns_rdataset_isassociated(&tat->rdataset))
+		dns_rdataset_disassociate(&tat->rdataset);
+	if (dns_rdataset_isassociated(&tat->sigrdataset))
+		dns_rdataset_disassociate(&tat->sigrdataset);
+	isc_task_detach(&tat->task);
+	isc_mem_putanddetach(&tat->mctx, tat, sizeof(*tat));
+}
+
+struct dotat_arg {
+	dns_view_t *view;
+	isc_task_t *task;
+};
+
+static void
+dotat(dns_keytable_t *keytable, dns_keynode_t *keynode, void *arg) {
+	isc_result_t result;
+	dns_keynode_t *firstnode = keynode;
+	dns_keynode_t *nextnode;
+	unsigned int i, n = 0;
+	char label[64], namebuf[DNS_NAME_FORMATSIZE];
+	dns_fixedname_t fixed;
+	dns_name_t *tatname;
+	isc_uint16_t ids[12]; /* Only 12 id's will fit in a label. */
+	int m;
+	ns_tat_t *tat;
+	dns_name_t *name = NULL;
+	struct dotat_arg *dotat_arg = arg;
+	dns_view_t *view;
+	isc_task_t *task;
+	isc_textregion_t r;
+
+	REQUIRE(keytable != NULL);
+	REQUIRE(keynode != NULL);
+	REQUIRE(arg != NULL);
+
+	view = dotat_arg->view;
+	task = dotat_arg->task;
+
+	do {
+		dst_key_t *key = dns_keynode_key(keynode);
+		if (key != NULL) {
+			name = dst_key_name(key);
+			if (n < (sizeof(ids)/sizeof(ids[0]))) {
+				ids[n] = dst_key_id(key);
+				n++;
+			}
+		}
+		nextnode = NULL;
+		(void)dns_keytable_nextkeynode(keytable, keynode, &nextnode);
+		if (keynode != firstnode)
+			dns_keytable_detachkeynode(keytable, &keynode);
+		keynode = nextnode;
+	} while (keynode != NULL);
+
+	if (n == 0)
+		return;
+
+	if (n > 1)
+		qsort(ids, n, sizeof(ids[0]), cid);
+
+	/*
+	 * Encoded as "_ta-xxxx\(-xxxx\)*" where xxxx is the hex version of
+	 * of the keyid.
+	 */
+	label[0] = 0;
+	r.base = label;
+	r.length = sizeof(label);;
+	m = snprintf(r.base, r.length, "_ta");
+	if (m < 0 || (unsigned)m > r.length)
+		return;
+	isc_textregion_consume(&r, m);
+	for (i = 0; i < n; i++) {
+		m = snprintf(r.base, r.length, "-%04x", ids[i]);
+		if (m < 0 || (unsigned)m > r.length)
+			return;
+		isc_textregion_consume(&r, m);
+	}
+	dns_fixedname_init(&fixed);
+	tatname = dns_fixedname_name(&fixed);
+	result = dns_name_fromstring2(tatname, label, name, 0, NULL);
+	if (result != ISC_R_SUCCESS)
+		return;
+
+	dns_name_format(tatname, namebuf, sizeof(namebuf));
+	isc_log_write(ns_g_lctx, NS_LOGCATEGORY_GENERAL, NS_LOGMODULE_SERVER,
+		      ISC_LOG_INFO,
+		     "%s: sending trust-anchor-telemetry query '%s/NULL'",
+		     view->name, namebuf);
+
+	tat = isc_mem_get(dotat_arg->view->mctx, sizeof(*tat));
+	if (tat == NULL)
+		return;
+
+	tat->mctx = NULL;
+	tat->task = NULL;
+	tat->fetch = NULL;
+	dns_rdataset_init(&tat->rdataset);
+	dns_rdataset_init(&tat->sigrdataset);
+	isc_mem_attach(dotat_arg->view->mctx, &tat->mctx);
+	isc_task_attach(task, &tat->task);
+
+	result = dns_resolver_createfetch(view->resolver, tatname,
+					  dns_rdatatype_null, NULL, NULL,
+					  NULL, 0, tat->task, tat_done, tat,
+					  &tat->rdataset, &tat->sigrdataset,
+					  &tat->fetch);
+
+	if (result != ISC_R_SUCCESS) {
+		isc_task_detach(&tat->task);
+		isc_mem_putanddetach(&tat->mctx, tat, sizeof(*tat));
+	}
+}
+
+static void
+tat_timer_tick(isc_task_t *task, isc_event_t *event) {
+	isc_result_t result;
+	ns_server_t *server = (ns_server_t *) event->ev_arg;
+	struct dotat_arg arg;
+	dns_view_t *view;
+	dns_keytable_t *secroots = NULL;
+
+	isc_event_free(&event);
+
+	for (view = ISC_LIST_HEAD(server->viewlist);
+	     view != NULL;
+	     view = ISC_LIST_NEXT(view, link))
+	{
+		if (!view->trust_anchor_telemetry)
+			continue;
+
+		result = dns_view_getsecroots(view, &secroots);
+		if (result != ISC_R_SUCCESS)
+			continue;
+
+		arg.view = view;
+		arg.task = task;
+		(void)dns_keytable_forall(secroots, dotat, &arg);
+		dns_keytable_detach(&secroots);
+	}
+}
+
 static void
 pps_timer_tick(isc_task_t *task, isc_event_t *event) {
 	static unsigned int oldrequests = 0;
@@ -7257,6 +7442,10 @@ load_configuration(const char *filename, ns_server_t *server,
 	CHECK(isc_timer_reset(server->pps_timer, isc_timertype_ticker, NULL,
 			      &interval, ISC_FALSE));
 
+	isc_interval_set(&interval, ns_g_tat_interval, 0);
+	CHECK(isc_timer_reset(server->tat_timer, isc_timertype_ticker, NULL,
+			      &interval, ISC_FALSE));
+
 	/*
 	 * Write the PID file.
 	 */
@@ -7970,6 +8159,11 @@ run_server(isc_task_t *task, isc_event_t *event) {
 				    server, &server->heartbeat_timer),
 		   "creating heartbeat timer");
 
+	CHECKFATAL(isc_timer_create(ns_g_timermgr, isc_timertype_inactive,
+				    NULL, NULL, server->task, tat_timer_tick,
+				    server, &server->tat_timer),
+		   "creating trust anchor telemetry timer");
+
 	CHECKFATAL(isc_timer_create(ns_g_timermgr, isc_timertype_inactive,
 				    NULL, NULL, server->task, pps_timer_tick,
 				    server, &server->pps_timer),
@@ -8059,6 +8253,7 @@ shutdown_server(isc_task_t *task, isc_event_t *event) {
 	isc_timer_detach(&server->interface_timer);
 	isc_timer_detach(&server->heartbeat_timer);
 	isc_timer_detach(&server->pps_timer);
+	isc_timer_detach(&server->tat_timer);
 
 	ns_interfacemgr_shutdown(server->interfacemgr);
 	ns_interfacemgr_detach(&server->interfacemgr);
@@ -8173,6 +8368,7 @@ ns_server_create(isc_mem_t *mctx, ns_server_t **serverp) {
 	server->interface_timer = NULL;
 	server->heartbeat_timer = NULL;
 	server->pps_timer = NULL;
+	server->tat_timer = NULL;
 
 	server->interface_interval = 0;
 	server->heartbeat_interval = 0;

bin/tests/system/dnssec/ns1/named.conf

@@ -6,8 +6,6 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
  */
 
-/* $Id: named.conf,v 1.24 2007/06/19 23:47:02 tbox Exp $ */
-
 // NS1
 
 controls { /* empty */ };
@@ -24,6 +22,8 @@ options {
 	notify yes;
 	dnssec-enable yes;
 	dnssec-validation yes;
+	/* test that we can turn off trust-anchor-telemetry */
+	trust-anchor-telemetry no;
 };
 
 zone "." {

bin/tests/system/dnssec/ns6/named.args

--m record,size,mctx -c named.conf -d 99 -X named.lock -g -T nonearest -T clienttest
+-m record,size,mctx -c named.conf -d 99 -X named.lock -g -T nonearest -T clienttest -T tat=1

bin/tests/system/dnssec/tests.sh

@@ -3286,5 +3286,26 @@ n=`expr $n + 1`
 if [ $ret != 0 ]; then echo "I:failed"; fi
 status=`expr $status + $ret`
 
+echo "I:check that trust-anchor-telemetry queries are logged ($n)"
+ret=0
+grep "sending trust-anchor-telemetry query '_ta-[0-9a-f]*/NULL" ns6/named.run > /dev/null || ret=1
+n=`expr $n + 1`
+if [ $ret != 0 ]; then echo "I:failed"; fi
+status=`expr $status + $ret`
+
+echo "I:check that trust-anchor-telemetry queries are received ($n)"
+ret=0
+grep "query '_ta-[0-9a-f]*/NULL/IN' approved" ns1/named.run > /dev/null || ret=1
+n=`expr $n + 1`
+if [ $ret != 0 ]; then echo "I:failed"; fi
+status=`expr $status + $ret`
+
+echo "I:check that trust-anchor-telemetry are not sent when disabled ($n)"
+ret=0
+grep "sending trust-anchor-telemetry query '_ta-[0-9a-f]*/NULL" ns1/named.run > /dev/null && ret=1
+n=`expr $n + 1`
+if [ $ret != 0 ]; then echo "I:failed"; fi
+status=`expr $status + $ret`
+
 echo "I:exit status: $status"
 [ $status -eq 0 ] || exit 1

bin/tests/system/mkeys/ns3/named.args

--m record,size,mctx -T clienttest -c named.conf -d 99 -X named.lock -g -T mkeytimers=2/10/20
+-m record,size,mctx -T clienttest -c named.conf -d 99 -X named.lock -g -T mkeytimers=2/10/20 -T tat=1

bin/tests/system/mkeys/tests.sh

@@ -534,5 +534,19 @@ grep "example..*.RRSIG..*TXT" dig.out.ns2.test$n > /dev/null || ret=1
 if [ $ret != 0 ]; then echo "I:failed"; fi
 status=`expr $status + $ret`
 
+n=`expr $n + 1`
+echo "I: check that trust-anchor-telemetry queries are logged ($n)"
+ret=0
+grep "sending trust-anchor-telemetry query '_ta-[0-9a-f]*/NULL" ns3/named.run > /dev/null || ret=1
+if [ $ret != 0 ]; then echo "I:failed"; fi
+status=`expr $status + $ret`
+
+n=`expr $n + 1`
+echo "I: check that trust-anchor-telemetry queries are received ($n)"
+ret=0
+grep "query '_ta-[0-9a-f]*/NULL/IN' approved" ns1/named.run > /dev/null || ret=1
+if [ $ret != 0 ]; then echo "I:failed"; fi
+status=`expr $status + $ret`
+
 echo "I:exit status: $status"
 [ $status -eq 0 ] || exit 1

doc/arm/Bv9ARM-book.xml

@@ -6435,6 +6435,37 @@ options {
 	      </listitem>
 	    </varlistentry>
+	    <varlistentry>
+	      <term><command>trust-anchor-telemetry</command></term>
+	      <listitem>
+		<para>
+		  Causes <command>named</command> to send specially-formed
+		  queries once per day to domains for which trust anchors
+		  have been configured via <command>trusted-keys</command>,
+		  <command>managed-keys</command>,
+		  <command>dnssec-validation auto</command>, or
+		  <command>dnssec-lookaside auto</command>.
+		</para>
+		<para>
+		  The query name used for these queries has the
+		  form "_ta-xxxx(-xxxx)(...)".&lt;domain&gt;, where
+		  each "xxxx" is a group of four hexadecimal digits
+		  representing the key ID of a trusted DNSSEC key.
+		  The key IDs for each domain are sorted smallest
+		  to largest prior to encoding. The query type is NULL.
+		</para>
+		<para>
+		  By monitoring these queries, zone operators will
+		  be able to see which resolvers have been updated to
+		  trust a new key; this may help them decide when it
+		  is safe to remove an old one.
+		</para>
+		<para>
+		  The default is <userinput>yes</userinput>.
+		</para>
+	      </listitem>
+	    </varlistentry>
+
 	    <varlistentry>
 	      <term><command>use-id-pool</command></term>
 	      <listitem>

doc/arm/notes.xml

@@ -609,6 +609,19 @@
 	  Thanks to Tony Finch for the contribution. [RT #41615]
 	</para>
       </listitem>
+      <listitem>
+	<para>
+	  <command>named</command> now provides feedback to the
+	  owners of zones which have trust anchors configured
+	  (<command>trusted-keys</command>,
+	  <command>managed-keys</command>, <command>dnssec-validation
+	  auto;</command> and <command>dnssec-lookaside auto;</command>)
+	  by sending a daily query which encodes the keyids of the
+	  configured trust anchors for the zone.  This is controlled
+	  by <command>trust-anchor-telemetry</command> and defaults
+	  to yes.
+	</para>
+      </listitem>
     </itemizedlist>
   </section>
 

lib/dns/include/dns/keytable.h

@@ -44,33 +44,6 @@
 
 ISC_LANG_BEGINDECLS
 
-struct dns_keytable {
-	/* Unlocked. */
-	unsigned int		magic;
-	isc_mem_t		*mctx;
-	isc_mutex_t		lock;
-	isc_rwlock_t		rwlock;
-	/* Locked by lock. */
-	isc_uint32_t		active_nodes;
-	/* Locked by rwlock. */
-	isc_uint32_t		references;
-	dns_rbt_t		*table;
-};
-
-#define KEYTABLE_MAGIC			ISC_MAGIC('K', 'T', 'b', 'l')
-#define VALID_KEYTABLE(kt)	 	ISC_MAGIC_VALID(kt, KEYTABLE_MAGIC)
-
-struct dns_keynode {
-	unsigned int		magic;
-	isc_refcount_t		refcount;
-	dst_key_t *		key;
-	isc_boolean_t           managed;
-	struct dns_keynode *	next;
-};
-
-#define KEYNODE_MAGIC			ISC_MAGIC('K', 'N', 'o', 'd')
-#define VALID_KEYNODE(kn)	 	ISC_MAGIC_VALID(kn, KEYNODE_MAGIC)
-
 isc_result_t
 dns_keytable_create(isc_mem_t *mctx, dns_keytable_t **keytablep);
 /*%<
@@ -453,6 +426,11 @@ dns_keynode_detachall(isc_mem_t *mctx, dns_keynode_t **target);
 /*%<
  * Detach a keynode and all its succesors.
  */
+
+isc_result_t
+dns_keytable_forall(dns_keytable_t *keytable,
+                    void (*func)(dns_keytable_t *, dns_keynode_t *, void *),
+		    void *arg);
 ISC_LANG_ENDDECLS
 
 #endif /* DNS_KEYTABLE_H */

lib/dns/include/dns/view.h

@@ -122,6 +122,7 @@ struct dns_view {
 	isc_boolean_t			enablevalidation;
 	isc_boolean_t			acceptexpired;
 	isc_boolean_t			requireservercookie;
+	isc_boolean_t			trust_anchor_telemetry;
 	dns_transfer_format_t		transfer_format;
 	dns_acl_t *			cacheacl;
 	dns_acl_t *			cacheonacl;

lib/dns/keytable.c

@@ -23,6 +23,33 @@
 #include <dns/rbt.h>
 #include <dns/result.h>
 
+#define KEYTABLE_MAGIC                  ISC_MAGIC('K', 'T', 'b', 'l')
+#define VALID_KEYTABLE(kt)              ISC_MAGIC_VALID(kt, KEYTABLE_MAGIC)
+
+#define KEYNODE_MAGIC                   ISC_MAGIC('K', 'N', 'o', 'd')
+#define VALID_KEYNODE(kn)               ISC_MAGIC_VALID(kn, KEYNODE_MAGIC)
+
+struct dns_keytable {
+        /* Unlocked. */
+        unsigned int            magic;
+        isc_mem_t               *mctx;
+        isc_mutex_t             lock;
+        isc_rwlock_t            rwlock;
+        /* Locked by lock. */
+        isc_uint32_t            active_nodes;
+        /* Locked by rwlock. */
+        isc_uint32_t            references;
+        dns_rbt_t               *table;
+};
+
+struct dns_keynode {
+        unsigned int            magic;
+        isc_refcount_t          refcount;
+        dst_key_t *             key;
+        isc_boolean_t           managed;
+        struct dns_keynode *    next;
+};
+
 static void
 free_keynode(void *node, void *arg) {
 	dns_keynode_t *keynode = node;
@@ -637,6 +664,43 @@ dns_keytable_totext(dns_keytable_t *keytable, isc_buffer_t **text) {
 	return (result);
 }
 
+isc_result_t
+dns_keytable_forall(dns_keytable_t *keytable,
+		    void (*func)(dns_keytable_t *, dns_keynode_t *, void *),
+		    void *arg)
+{
+	isc_result_t result;
+	dns_rbtnode_t *node;
+	dns_rbtnodechain_t chain;
+
+	REQUIRE(VALID_KEYTABLE(keytable));
+
+	RWLOCK(&keytable->rwlock, isc_rwlocktype_read);
+	dns_rbtnodechain_init(&chain, keytable->mctx);
+	result = dns_rbtnodechain_first(&chain, keytable->table, NULL, NULL);
+	if (result != ISC_R_SUCCESS && result != DNS_R_NEWORIGIN) {
+		if (result == ISC_R_NOTFOUND)
+			result = ISC_R_SUCCESS;
+		goto cleanup;
+	}
+	for (;;) {
+		dns_rbtnodechain_current(&chain, NULL, NULL, &node);
+		if (node->data != NULL)
+			(*func)(keytable, node->data, arg);
+		result = dns_rbtnodechain_next(&chain, NULL, NULL);
+		if (result != ISC_R_SUCCESS && result != DNS_R_NEWORIGIN) {
+			if (result == ISC_R_NOMORE)
+				result = ISC_R_SUCCESS;
+			break;
+		}
+	}
+
+   cleanup:
+	dns_rbtnodechain_invalidate(&chain);
+	RWUNLOCK(&keytable->rwlock, isc_rwlocktype_read);
+	return (result);
+}
+
 dst_key_t *
 dns_keynode_key(dns_keynode_t *keynode) {
 

lib/dns/view.c

@@ -43,13 +43,13 @@
 #include <dns/nta.h>
 #include <dns/order.h>
 #include <dns/peer.h>
-#include <dns/rrl.h>
 #include <dns/rbt.h>
 #include <dns/rdataset.h>
 #include <dns/request.h>
 #include <dns/resolver.h>
 #include <dns/result.h>
 #include <dns/rpz.h>
+#include <dns/rrl.h>
 #include <dns/stats.h>
 #include <dns/time.h>
 #include <dns/tsig.h>
@@ -233,6 +233,7 @@ dns_view_create(isc_mem_t *mctx, dns_rdataclass_t rdclass,
 	view->requestnsid = ISC_FALSE;
 	view->sendcookie = ISC_TRUE;
 	view->requireservercookie = ISC_FALSE;
+	view->trust_anchor_telemetry = ISC_TRUE;
 	view->new_zone_file = NULL;
 	view->new_zone_db = NULL;
 	view->new_zone_dbenv = NULL;

lib/dns/zone.c

@@ -4010,6 +4010,54 @@ failure:
 	return (result);
 }
 
+struct addifmissing_arg {
+	dns_db_t *db;
+	dns_dbversion_t *ver;
+	dns_diff_t *diff;
+	dns_zone_t *zone;
+	isc_boolean_t *changed;
+	isc_result_t result;
+};
+
+static void
+addifmissing(dns_keytable_t *keytable, dns_keynode_t *keynode, void *arg) {
+	dns_db_t *db = ((struct addifmissing_arg *)arg)->db;
+	dns_dbversion_t *ver = ((struct addifmissing_arg *)arg)->ver;
+	dns_diff_t *diff = ((struct addifmissing_arg *)arg)->diff;
+	dns_zone_t *zone = ((struct addifmissing_arg *)arg)->zone;
+	isc_boolean_t *changed = ((struct addifmissing_arg *)arg)->changed;
+	isc_result_t result;
+	dns_keynode_t *dummy = NULL;
+
+	if (((struct addifmissing_arg *)arg)->result != ISC_R_SUCCESS)
+		return;
+
+	if (dns_keynode_managed(keynode)) {
+		dns_fixedname_t fname;
+		dns_name_t *keyname;
+		dst_key_t *key;
+
+		key = dns_keynode_key(keynode);
+		if (key == NULL)
+			return;
+		dns_fixedname_init(&fname);
+
+		keyname = dst_key_name(key);
+		result = dns_db_find(db, keyname, ver,
+				     dns_rdatatype_keydata,
+				     DNS_DBFIND_NOWILD, 0, NULL,
+				     dns_fixedname_name(&fname),