2 * Copyright (C) 2004-2012 Internet Systems Consortium, Inc. ("ISC")
3 * Copyright (C) 1999-2003 Internet Software Consortium.
5 * Permission to use, copy, modify, and/or distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
9 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
10 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
11 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
12 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
13 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
14 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
15 * PERFORMANCE OF THIS SOFTWARE.
18 /* $Id: query.c,v 1.353.8.24 2012/02/07 01:14:39 marka Exp $ */
28 #include <isc/stats.h>
32 #include <dns/byaddr.h>
35 #include <dns/dns64.h>
36 #include <dns/dnssec.h>
37 #include <dns/events.h>
38 #include <dns/message.h>
39 #include <dns/ncache.h>
40 #include <dns/nsec3.h>
41 #include <dns/order.h>
42 #include <dns/rdata.h>
43 #include <dns/rdataclass.h>
44 #include <dns/rdatalist.h>
45 #include <dns/rdataset.h>
46 #include <dns/rdatasetiter.h>
47 #include <dns/rdatastruct.h>
48 #include <dns/rdatatype.h>
49 #include <dns/resolver.h>
50 #include <dns/result.h>
51 #include <dns/stats.h>
57 #include <named/client.h>
58 #include <named/globals.h>
59 #include <named/log.h>
60 #include <named/server.h>
61 #include <named/sortlist.h>
62 #include <named/xfrout.h>
66 * It has been recommended that DNS64 be changed to return excluded
67 * AAAA addresses if DNS64 synthesis does not occur. This minimises
68 * the impact on the lookup results. While most DNS AAAA lookups are
69 * done to send IP packets to a host, not all of them are and filtering
70 * excluded addresses has a negative impact on those uses.
72 #define dns64_bis_return_excluded_addresses 1
75 /*% Partial answer? */
76 #define PARTIALANSWER(c) (((c)->query.attributes & \
77 NS_QUERYATTR_PARTIALANSWER) != 0)
79 #define USECACHE(c) (((c)->query.attributes & \
80 NS_QUERYATTR_CACHEOK) != 0)
82 #define RECURSIONOK(c) (((c)->query.attributes & \
83 NS_QUERYATTR_RECURSIONOK) != 0)
85 #define RECURSING(c) (((c)->query.attributes & \
86 NS_QUERYATTR_RECURSING) != 0)
88 #define CACHEGLUEOK(c) (((c)->query.attributes & \
89 NS_QUERYATTR_CACHEGLUEOK) != 0)
90 /*% Want Recursion? */
91 #define WANTRECURSION(c) (((c)->query.attributes & \
92 NS_QUERYATTR_WANTRECURSION) != 0)
94 #define WANTDNSSEC(c) (((c)->attributes & \
95 NS_CLIENTATTR_WANTDNSSEC) != 0)
97 #define NOAUTHORITY(c) (((c)->query.attributes & \
98 NS_QUERYATTR_NOAUTHORITY) != 0)
100 #define NOADDITIONAL(c) (((c)->query.attributes & \
101 NS_QUERYATTR_NOADDITIONAL) != 0)
103 #define SECURE(c) (((c)->query.attributes & \
104 NS_QUERYATTR_SECURE) != 0)
105 /*% DNS64 A lookup? */
106 #define DNS64(c) (((c)->query.attributes & \
107 NS_QUERYATTR_DNS64) != 0)
109 #define DNS64EXCLUDE(c) (((c)->query.attributes & \
110 NS_QUERYATTR_DNS64EXCLUDE) != 0)
112 /*% No QNAME Proof? */
113 #define NOQNAME(r) (((r)->attributes & \
114 DNS_RDATASETATTR_NOQNAME) != 0)
117 #define CTRACE(m) isc_log_write(ns_g_lctx, \
118 NS_LOGCATEGORY_CLIENT, \
119 NS_LOGMODULE_QUERY, \
121 "client %p: %s", client, (m))
122 #define QTRACE(m) isc_log_write(ns_g_lctx, \
123 NS_LOGCATEGORY_GENERAL, \
124 NS_LOGMODULE_QUERY, \
126 "query %p: %s", query, (m))
128 #define CTRACE(m) ((void)m)
129 #define QTRACE(m) ((void)m)
132 #define DNS_GETDB_NOEXACT 0x01U
133 #define DNS_GETDB_NOLOG 0x02U
134 #define DNS_GETDB_PARTIAL 0x04U
135 #define DNS_GETDB_IGNOREACL 0x08U
137 #define PENDINGOK(x) (((x) & DNS_DBFIND_PENDINGOK) != 0)
139 typedef struct client_additionalctx {
141 dns_rdataset_t *rdataset;
142 } client_additionalctx_t;
145 query_find(ns_client_t *client, dns_fetchevent_t *event, dns_rdatatype_t qtype);
148 validate(ns_client_t *client, dns_db_t *db, dns_name_t *name,
149 dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset);
152 query_findclosestnsec3(dns_name_t *qname, dns_db_t *db,
153 dns_dbversion_t *version, ns_client_t *client,
154 dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset,
155 dns_name_t *fname, isc_boolean_t exact,
159 log_queryerror(ns_client_t *client, isc_result_t result, int line, int level);
162 rpz_st_clear(ns_client_t *client);
165 * Increment query statistics counters.
168 inc_stats(ns_client_t *client, isc_statscounter_t counter) {
169 dns_zone_t *zone = client->query.authzone;
171 isc_stats_increment(ns_g_server->nsstats, counter);
174 isc_stats_t *zonestats = dns_zone_getrequeststats(zone);
175 if (zonestats != NULL)
176 isc_stats_increment(zonestats, counter);
181 query_send(ns_client_t *client) {
182 isc_statscounter_t counter;
183 if ((client->message->flags & DNS_MESSAGEFLAG_AA) == 0)
184 inc_stats(client, dns_nsstatscounter_nonauthans);
186 inc_stats(client, dns_nsstatscounter_authans);
187 if (client->message->rcode == dns_rcode_noerror) {
188 if (ISC_LIST_EMPTY(client->message->sections[DNS_SECTION_ANSWER])) {
189 if (client->query.isreferral) {
190 counter = dns_nsstatscounter_referral;
192 counter = dns_nsstatscounter_nxrrset;
195 counter = dns_nsstatscounter_success;
197 } else if (client->message->rcode == dns_rcode_nxdomain) {
198 counter = dns_nsstatscounter_nxdomain;
200 /* We end up here in case of YXDOMAIN, and maybe others */
201 counter = dns_nsstatscounter_failure;
203 inc_stats(client, counter);
204 ns_client_send(client);
208 query_error(ns_client_t *client, isc_result_t result, int line) {
209 int loglevel = ISC_LOG_DEBUG(3);
213 loglevel = ISC_LOG_DEBUG(1);
214 inc_stats(client, dns_nsstatscounter_servfail);
217 inc_stats(client, dns_nsstatscounter_formerr);
220 inc_stats(client, dns_nsstatscounter_failure);
224 log_queryerror(client, result, line, loglevel);
226 ns_client_error(client, result);
230 query_next(ns_client_t *client, isc_result_t result) {
231 if (result == DNS_R_DUPLICATE)
232 inc_stats(client, dns_nsstatscounter_duplicate);
233 else if (result == DNS_R_DROP)
234 inc_stats(client, dns_nsstatscounter_dropped);
236 inc_stats(client, dns_nsstatscounter_failure);
237 ns_client_next(client, result);
241 query_freefreeversions(ns_client_t *client, isc_boolean_t everything) {
242 ns_dbversion_t *dbversion, *dbversion_next;
245 for (dbversion = ISC_LIST_HEAD(client->query.freeversions), i = 0;
247 dbversion = dbversion_next, i++)
249 dbversion_next = ISC_LIST_NEXT(dbversion, link);
251 * If we're not freeing everything, we keep the first three
252 * dbversions structures around.
254 if (i > 3 || everything) {
255 ISC_LIST_UNLINK(client->query.freeversions, dbversion,
257 isc_mem_put(client->mctx, dbversion,
264 ns_query_cancel(ns_client_t *client) {
265 LOCK(&client->query.fetchlock);
266 if (client->query.fetch != NULL) {
267 dns_resolver_cancelfetch(client->query.fetch);
269 client->query.fetch = NULL;
271 UNLOCK(&client->query.fetchlock);
275 query_putrdataset(ns_client_t *client, dns_rdataset_t **rdatasetp) {
276 dns_rdataset_t *rdataset = *rdatasetp;
278 CTRACE("query_putrdataset");
279 if (rdataset != NULL) {
280 if (dns_rdataset_isassociated(rdataset))
281 dns_rdataset_disassociate(rdataset);
282 dns_message_puttemprdataset(client->message, rdatasetp);
284 CTRACE("query_putrdataset: done");
288 query_reset(ns_client_t *client, isc_boolean_t everything) {
289 isc_buffer_t *dbuf, *dbuf_next;
290 ns_dbversion_t *dbversion, *dbversion_next;
293 * Reset the query state of a client to its default state.
297 * Cancel the fetch if it's running.
299 ns_query_cancel(client);
302 * Cleanup any active versions.
304 for (dbversion = ISC_LIST_HEAD(client->query.activeversions);
306 dbversion = dbversion_next) {
307 dbversion_next = ISC_LIST_NEXT(dbversion, link);
308 dns_db_closeversion(dbversion->db, &dbversion->version,
310 dns_db_detach(&dbversion->db);
311 ISC_LIST_INITANDAPPEND(client->query.freeversions,
314 ISC_LIST_INIT(client->query.activeversions);
316 if (client->query.authdb != NULL)
317 dns_db_detach(&client->query.authdb);
318 if (client->query.authzone != NULL)
319 dns_zone_detach(&client->query.authzone);
321 if (client->query.dns64_aaaa != NULL)
322 query_putrdataset(client, &client->query.dns64_aaaa);
323 if (client->query.dns64_sigaaaa != NULL)
324 query_putrdataset(client, &client->query.dns64_sigaaaa);
325 if (client->query.dns64_aaaaok != NULL) {
326 isc_mem_put(client->mctx, client->query.dns64_aaaaok,
327 client->query.dns64_aaaaoklen *
328 sizeof(isc_boolean_t));
329 client->query.dns64_aaaaok = NULL;
330 client->query.dns64_aaaaoklen = 0;
333 query_freefreeversions(client, everything);
335 for (dbuf = ISC_LIST_HEAD(client->query.namebufs);
338 dbuf_next = ISC_LIST_NEXT(dbuf, link);
339 if (dbuf_next != NULL || everything) {
340 ISC_LIST_UNLINK(client->query.namebufs, dbuf, link);
341 isc_buffer_free(&dbuf);
345 if (client->query.restarts > 0) {
347 * client->query.qname was dynamically allocated.
349 dns_message_puttempname(client->message,
350 &client->query.qname);
352 client->query.qname = NULL;
353 client->query.attributes = (NS_QUERYATTR_RECURSIONOK |
354 NS_QUERYATTR_CACHEOK |
355 NS_QUERYATTR_SECURE);
356 client->query.restarts = 0;
357 client->query.timerset = ISC_FALSE;
358 if (client->query.rpz_st != NULL) {
359 rpz_st_clear(client);
361 isc_mem_put(client->mctx, client->query.rpz_st,
362 sizeof(*client->query.rpz_st));
363 client->query.rpz_st = NULL;
366 client->query.origqname = NULL;
367 client->query.dboptions = 0;
368 client->query.fetchoptions = 0;
369 client->query.gluedb = NULL;
370 client->query.authdbset = ISC_FALSE;
371 client->query.isreferral = ISC_FALSE;
372 client->query.dns64_options = 0;
373 client->query.dns64_ttl = ISC_UINT32_MAX;
377 query_next_callback(ns_client_t *client) {
378 query_reset(client, ISC_FALSE);
382 ns_query_free(ns_client_t *client) {
383 query_reset(client, ISC_TRUE);
386 static inline isc_result_t
387 query_newnamebuf(ns_client_t *client) {
391 CTRACE("query_newnamebuf");
393 * Allocate a name buffer.
397 result = isc_buffer_allocate(client->mctx, &dbuf, 1024);
398 if (result != ISC_R_SUCCESS) {
399 CTRACE("query_newnamebuf: isc_buffer_allocate failed: done");
402 ISC_LIST_APPEND(client->query.namebufs, dbuf, link);
404 CTRACE("query_newnamebuf: done");
405 return (ISC_R_SUCCESS);
408 static inline isc_buffer_t *
409 query_getnamebuf(ns_client_t *client) {
414 CTRACE("query_getnamebuf");
416 * Return a name buffer with space for a maximal name, allocating
417 * a new one if necessary.
420 if (ISC_LIST_EMPTY(client->query.namebufs)) {
421 result = query_newnamebuf(client);
422 if (result != ISC_R_SUCCESS) {
423 CTRACE("query_getnamebuf: query_newnamebuf failed: done");
428 dbuf = ISC_LIST_TAIL(client->query.namebufs);
429 INSIST(dbuf != NULL);
430 isc_buffer_availableregion(dbuf, &r);
431 if (r.length < 255) {
432 result = query_newnamebuf(client);
433 if (result != ISC_R_SUCCESS) {
434 CTRACE("query_getnamebuf: query_newnamebuf failed: done");
438 dbuf = ISC_LIST_TAIL(client->query.namebufs);
439 isc_buffer_availableregion(dbuf, &r);
440 INSIST(r.length >= 255);
442 CTRACE("query_getnamebuf: done");
447 query_keepname(ns_client_t *client, dns_name_t *name, isc_buffer_t *dbuf) {
450 CTRACE("query_keepname");
452 * 'name' is using space in 'dbuf', but 'dbuf' has not yet been
453 * adjusted to take account of that. We do the adjustment.
456 REQUIRE((client->query.attributes & NS_QUERYATTR_NAMEBUFUSED) != 0);
458 dns_name_toregion(name, &r);
459 isc_buffer_add(dbuf, r.length);
460 dns_name_setbuffer(name, NULL);
461 client->query.attributes &= ~NS_QUERYATTR_NAMEBUFUSED;
465 query_releasename(ns_client_t *client, dns_name_t **namep) {
466 dns_name_t *name = *namep;
469 * 'name' is no longer needed. Return it to our pool of temporary
470 * names. If it is using a name buffer, relinquish its exclusive
471 * rights on the buffer.
474 CTRACE("query_releasename");
475 if (dns_name_hasbuffer(name)) {
476 INSIST((client->query.attributes & NS_QUERYATTR_NAMEBUFUSED)
478 client->query.attributes &= ~NS_QUERYATTR_NAMEBUFUSED;
480 dns_message_puttempname(client->message, namep);
481 CTRACE("query_releasename: done");
484 static inline dns_name_t *
485 query_newname(ns_client_t *client, isc_buffer_t *dbuf,
492 REQUIRE((client->query.attributes & NS_QUERYATTR_NAMEBUFUSED) == 0);
494 CTRACE("query_newname");
496 result = dns_message_gettempname(client->message, &name);
497 if (result != ISC_R_SUCCESS) {
498 CTRACE("query_newname: dns_message_gettempname failed: done");
501 isc_buffer_availableregion(dbuf, &r);
502 isc_buffer_init(nbuf, r.base, r.length);
503 dns_name_init(name, NULL);
504 dns_name_setbuffer(name, nbuf);
505 client->query.attributes |= NS_QUERYATTR_NAMEBUFUSED;
507 CTRACE("query_newname: done");
511 static inline dns_rdataset_t *
512 query_newrdataset(ns_client_t *client) {
513 dns_rdataset_t *rdataset;
516 CTRACE("query_newrdataset");
518 result = dns_message_gettemprdataset(client->message, &rdataset);
519 if (result != ISC_R_SUCCESS) {
520 CTRACE("query_newrdataset: "
521 "dns_message_gettemprdataset failed: done");
524 dns_rdataset_init(rdataset);
526 CTRACE("query_newrdataset: done");
530 static inline isc_result_t
531 query_newdbversion(ns_client_t *client, unsigned int n) {
533 ns_dbversion_t *dbversion;
535 for (i = 0; i < n; i++) {
536 dbversion = isc_mem_get(client->mctx, sizeof(*dbversion));
537 if (dbversion != NULL) {
538 dbversion->db = NULL;
539 dbversion->version = NULL;
540 ISC_LIST_INITANDAPPEND(client->query.freeversions,
544 * We only return ISC_R_NOMEMORY if we couldn't
548 return (ISC_R_NOMEMORY);
550 return (ISC_R_SUCCESS);
554 return (ISC_R_SUCCESS);
557 static inline ns_dbversion_t *
558 query_getdbversion(ns_client_t *client) {
560 ns_dbversion_t *dbversion;
562 if (ISC_LIST_EMPTY(client->query.freeversions)) {
563 result = query_newdbversion(client, 1);
564 if (result != ISC_R_SUCCESS)
567 dbversion = ISC_LIST_HEAD(client->query.freeversions);
568 INSIST(dbversion != NULL);
569 ISC_LIST_UNLINK(client->query.freeversions, dbversion, link);
575 ns_query_init(ns_client_t *client) {
578 ISC_LIST_INIT(client->query.namebufs);
579 ISC_LIST_INIT(client->query.activeversions);
580 ISC_LIST_INIT(client->query.freeversions);
581 client->query.restarts = 0;
582 client->query.timerset = ISC_FALSE;
583 client->query.rpz_st = NULL;
584 client->query.qname = NULL;
585 result = isc_mutex_init(&client->query.fetchlock);
586 if (result != ISC_R_SUCCESS)
588 client->query.fetch = NULL;
589 client->query.authdb = NULL;
590 client->query.authzone = NULL;
591 client->query.authdbset = ISC_FALSE;
592 client->query.isreferral = ISC_FALSE;
593 client->query.dns64_aaaa = NULL;
594 client->query.dns64_sigaaaa = NULL;
595 client->query.dns64_aaaaok = NULL;
596 client->query.dns64_aaaaoklen = 0;
597 query_reset(client, ISC_FALSE);
598 result = query_newdbversion(client, 3);
599 if (result != ISC_R_SUCCESS) {
600 DESTROYLOCK(&client->query.fetchlock);
603 result = query_newnamebuf(client);
604 if (result != ISC_R_SUCCESS)
605 query_freefreeversions(client, ISC_TRUE);
610 static inline ns_dbversion_t *
611 query_findversion(ns_client_t *client, dns_db_t *db)
613 ns_dbversion_t *dbversion;
616 * We may already have done a query related to this
617 * database. If so, we must be sure to make subsequent
618 * queries from the same version.
620 for (dbversion = ISC_LIST_HEAD(client->query.activeversions);
622 dbversion = ISC_LIST_NEXT(dbversion, link)) {
623 if (dbversion->db == db)
627 if (dbversion == NULL) {
629 * This is a new zone for this query. Add it to
632 dbversion = query_getdbversion(client);
633 if (dbversion == NULL)
635 dns_db_attach(db, &dbversion->db);
636 dns_db_currentversion(db, &dbversion->version);
637 dbversion->acl_checked = ISC_FALSE;
638 dbversion->queryok = ISC_FALSE;
639 ISC_LIST_APPEND(client->query.activeversions,
646 static inline isc_result_t
647 query_validatezonedb(ns_client_t *client, dns_name_t *name,
648 dns_rdatatype_t qtype, unsigned int options,
649 dns_zone_t *zone, dns_db_t *db,
650 dns_dbversion_t **versionp)
654 ns_dbversion_t *dbversion;
656 REQUIRE(zone != NULL);
660 * This limits our searching to the zone where the first name
661 * (the query target) was looked for. This prevents following
662 * CNAMES or DNAMES into other zones and prevents returning
663 * additional data from other zones.
665 if (!client->view->additionalfromauth &&
666 client->query.authdbset &&
667 db != client->query.authdb)
668 return (DNS_R_REFUSED);
671 * Non recursive query to a static-stub zone is prohibited; its
672 * zone content is not public data, but a part of local configuration
673 * and should not be disclosed.
675 if (dns_zone_gettype(zone) == dns_zone_staticstub &&
676 !RECURSIONOK(client)) {
677 return (DNS_R_REFUSED);
681 * If the zone has an ACL, we'll check it, otherwise
682 * we use the view's "allow-query" ACL. Each ACL is only checked
685 * Also, get the database version to use.
689 * Get the current version of this database.
691 dbversion = query_findversion(client, db);
692 if (dbversion == NULL)
693 return (DNS_R_SERVFAIL);
695 if ((options & DNS_GETDB_IGNOREACL) != 0)
697 if (dbversion->acl_checked) {
698 if (!dbversion->queryok)
699 return (DNS_R_REFUSED);
703 queryacl = dns_zone_getqueryacl(zone);
704 if (queryacl == NULL) {
705 queryacl = client->view->queryacl;
706 if ((client->query.attributes &
707 NS_QUERYATTR_QUERYOKVALID) != 0) {
709 * We've evaluated the view's queryacl already. If
710 * NS_QUERYATTR_QUERYOK is set, then the client is
711 * allowed to make queries, otherwise the query should
714 dbversion->acl_checked = ISC_TRUE;
715 if ((client->query.attributes &
716 NS_QUERYATTR_QUERYOK) == 0) {
717 dbversion->queryok = ISC_FALSE;
718 return (DNS_R_REFUSED);
720 dbversion->queryok = ISC_TRUE;
725 result = ns_client_checkaclsilent(client, NULL, queryacl, ISC_TRUE);
726 if ((options & DNS_GETDB_NOLOG) == 0) {
727 char msg[NS_CLIENT_ACLMSGSIZE("query")];
728 if (result == ISC_R_SUCCESS) {
729 if (isc_log_wouldlog(ns_g_lctx, ISC_LOG_DEBUG(3))) {
730 ns_client_aclmsg("query", name, qtype,
731 client->view->rdclass,
733 ns_client_log(client,
734 DNS_LOGCATEGORY_SECURITY,
740 ns_client_aclmsg("query", name, qtype,
741 client->view->rdclass,
743 ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
744 NS_LOGMODULE_QUERY, ISC_LOG_INFO,
749 if (queryacl == client->view->queryacl) {
750 if (result == ISC_R_SUCCESS) {
752 * We were allowed by the default
753 * "allow-query" ACL. Remember this so we
754 * don't have to check again.
756 client->query.attributes |= NS_QUERYATTR_QUERYOK;
759 * We've now evaluated the view's query ACL, and
760 * the NS_QUERYATTR_QUERYOK attribute is now valid.
762 client->query.attributes |= NS_QUERYATTR_QUERYOKVALID;
765 dbversion->acl_checked = ISC_TRUE;
766 if (result != ISC_R_SUCCESS) {
767 dbversion->queryok = ISC_FALSE;
768 return (DNS_R_REFUSED);
770 dbversion->queryok = ISC_TRUE;
773 /* Transfer ownership, if necessary. */
774 if (versionp != NULL)
775 *versionp = dbversion->version;
776 return (ISC_R_SUCCESS);
779 static inline isc_result_t
780 query_getzonedb(ns_client_t *client, dns_name_t *name, dns_rdatatype_t qtype,
781 unsigned int options, dns_zone_t **zonep, dns_db_t **dbp,
782 dns_dbversion_t **versionp)
785 unsigned int ztoptions;
786 dns_zone_t *zone = NULL;
788 isc_boolean_t partial = ISC_FALSE;
790 REQUIRE(zonep != NULL && *zonep == NULL);
791 REQUIRE(dbp != NULL && *dbp == NULL);
794 * Find a zone database to answer the query.
796 ztoptions = ((options & DNS_GETDB_NOEXACT) != 0) ?
797 DNS_ZTFIND_NOEXACT : 0;
799 result = dns_zt_find(client->view->zonetable, name, ztoptions, NULL,
801 if (result == DNS_R_PARTIALMATCH)
803 if (result == ISC_R_SUCCESS || result == DNS_R_PARTIALMATCH)
804 result = dns_zone_getdb(zone, &db);
806 if (result != ISC_R_SUCCESS)
809 result = query_validatezonedb(client, name, qtype, options, zone, db,
812 if (result != ISC_R_SUCCESS)
815 /* Transfer ownership. */
819 if (partial && (options & DNS_GETDB_PARTIAL) != 0)
820 return (DNS_R_PARTIALMATCH);
821 return (ISC_R_SUCCESS);
825 dns_zone_detach(&zone);
833 rpz_log_rewrite(ns_client_t *client, const char *disabled,
834 dns_rpz_policy_t policy, dns_rpz_type_t type,
835 dns_name_t *rpz_qname) {
836 char qname_buf[DNS_NAME_FORMATSIZE];
837 char rpz_qname_buf[DNS_NAME_FORMATSIZE];
839 if (!isc_log_wouldlog(ns_g_lctx, DNS_RPZ_INFO_LEVEL))
842 dns_name_format(client->query.qname, qname_buf, sizeof(qname_buf));
843 dns_name_format(rpz_qname, rpz_qname_buf, sizeof(rpz_qname_buf));
845 ns_client_log(client, DNS_LOGCATEGORY_RPZ, NS_LOGMODULE_QUERY,
846 DNS_RPZ_INFO_LEVEL, "%srpz %s %s rewrite %s via %s",
848 dns_rpz_type2str(type), dns_rpz_policy2str(policy),
849 qname_buf, rpz_qname_buf);
853 rpz_log_fail(ns_client_t *client, int level,
854 dns_rpz_type_t rpz_type, dns_name_t *name,
855 const char *str, isc_result_t result)
857 char namebuf1[DNS_NAME_FORMATSIZE];
858 char namebuf2[DNS_NAME_FORMATSIZE];
860 if (!isc_log_wouldlog(ns_g_lctx, level))
863 dns_name_format(client->query.qname, namebuf1, sizeof(namebuf1));
864 dns_name_format(name, namebuf2, sizeof(namebuf2));
865 ns_client_log(client, NS_LOGCATEGORY_QUERY_EERRORS,
866 NS_LOGMODULE_QUERY, level,
867 "rpz %s rewrite %s via %s %sfailed: %s",
868 dns_rpz_type2str(rpz_type),
869 namebuf1, namebuf2, str, isc_result_totext(result));
873 * Get a policy rewrite zone database.
876 rpz_getdb(ns_client_t *client, dns_rpz_type_t rpz_type, dns_name_t *rpz_qname,
877 dns_zone_t **zonep, dns_db_t **dbp, dns_dbversion_t **versionp)
879 char namebuf1[DNS_NAME_FORMATSIZE];
880 char namebuf2[DNS_NAME_FORMATSIZE];
881 dns_dbversion_t *rpz_version = NULL;
884 result = query_getzonedb(client, rpz_qname, dns_rdatatype_any,
885 DNS_GETDB_IGNOREACL, zonep, dbp, &rpz_version);
886 if (result == ISC_R_SUCCESS) {
887 if (isc_log_wouldlog(ns_g_lctx, DNS_RPZ_DEBUG_LEVEL2)) {
888 dns_name_format(client->query.qname, namebuf1,
890 dns_name_format(rpz_qname, namebuf2, sizeof(namebuf2));
891 ns_client_log(client, DNS_LOGCATEGORY_RPZ,
892 NS_LOGMODULE_QUERY, DNS_RPZ_DEBUG_LEVEL2,
893 "try rpz %s rewrite %s via %s",
894 dns_rpz_type2str(rpz_type),
897 *versionp = rpz_version;
898 return (ISC_R_SUCCESS);
900 rpz_log_fail(client, DNS_RPZ_ERROR_LEVEL, rpz_type, rpz_qname,
901 "query_getzonedb() ", result);
905 static inline isc_result_t
906 query_getcachedb(ns_client_t *client, dns_name_t *name, dns_rdatatype_t qtype,
907 dns_db_t **dbp, unsigned int options)
910 isc_boolean_t check_acl;
913 REQUIRE(dbp != NULL && *dbp == NULL);
916 * Find a cache database to answer the query.
917 * This may fail with DNS_R_REFUSED if the client
918 * is not allowed to use the cache.
921 if (!USECACHE(client))
922 return (DNS_R_REFUSED);
923 dns_db_attach(client->view->cachedb, &db);
925 if ((client->query.attributes & NS_QUERYATTR_CACHEACLOKVALID) != 0) {
927 * We've evaluated the view's cacheacl already. If
928 * NS_QUERYATTR_CACHEACLOK is set, then the client is
929 * allowed to make queries, otherwise the query should
932 check_acl = ISC_FALSE;
933 if ((client->query.attributes & NS_QUERYATTR_CACHEACLOK) == 0)
937 * We haven't evaluated the view's queryacl yet.
939 check_acl = ISC_TRUE;
943 isc_boolean_t log = ISC_TF((options & DNS_GETDB_NOLOG) == 0);
944 char msg[NS_CLIENT_ACLMSGSIZE("query (cache)")];
946 result = ns_client_checkaclsilent(client, NULL,
947 client->view->cacheacl,
949 if (result == ISC_R_SUCCESS) {
951 * We were allowed by the "allow-query-cache" ACL.
952 * Remember this so we don't have to check again.
954 client->query.attributes |=
955 NS_QUERYATTR_CACHEACLOK;
956 if (log && isc_log_wouldlog(ns_g_lctx,
959 ns_client_aclmsg("query (cache)", name, qtype,
960 client->view->rdclass,
962 ns_client_log(client,
963 DNS_LOGCATEGORY_SECURITY,
969 ns_client_aclmsg("query (cache)", name, qtype,
970 client->view->rdclass, msg,
972 ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
973 NS_LOGMODULE_QUERY, ISC_LOG_INFO,
977 * We've now evaluated the view's query ACL, and
978 * the NS_QUERYATTR_CACHEACLOKVALID attribute is now valid.
980 client->query.attributes |= NS_QUERYATTR_CACHEACLOKVALID;
982 if (result != ISC_R_SUCCESS)
988 /* Transfer ownership. */
991 return (ISC_R_SUCCESS);
994 result = DNS_R_REFUSED;
1003 static inline isc_result_t
1004 query_getdb(ns_client_t *client, dns_name_t *name, dns_rdatatype_t qtype,
1005 unsigned int options, dns_zone_t **zonep, dns_db_t **dbp,
1006 dns_dbversion_t **versionp, isc_boolean_t *is_zonep)
1008 isc_result_t result;
1010 isc_result_t tresult;
1011 unsigned int namelabels;
1012 unsigned int zonelabels;
1013 dns_zone_t *zone = NULL;
1016 REQUIRE(zonep != NULL && *zonep == NULL);
1020 /* Calculate how many labels are in name. */
1021 namelabels = dns_name_countlabels(name);
1024 /* Try to find name in bind's standard database. */
1025 result = query_getzonedb(client, name, qtype, options, &zone,
1028 /* See how many labels are in the zone's name. */
1029 if (result == ISC_R_SUCCESS && zone != NULL)
1030 zonelabels = dns_name_countlabels(dns_zone_getorigin(zone));
1032 * If # zone labels < # name labels, try to find an even better match
1033 * Only try if a DLZ driver is loaded for this view
1035 if (zonelabels < namelabels && client->view->dlzdatabase != NULL) {
1036 tresult = dns_dlzfindzone(client->view, name,
1038 /* If we successful, we found a better match. */
1039 if (tresult == ISC_R_SUCCESS) {
1041 * If the previous search returned a zone, detach it.
1044 dns_zone_detach(&zone);
1047 * If the previous search returned a database,
1054 * If the previous search returned a version, clear it.
1059 * Get our database version.
1061 dns_db_currentversion(tdbp, versionp);
1064 * Be sure to return our database.
1069 * We return a null zone, No stats for DLZ zones.
1076 /* If successful, Transfer ownership of zone. */
1077 if (result == ISC_R_SUCCESS) {
1080 * If neither attempt above succeeded, return the cache instead
1082 *is_zonep = ISC_TRUE;
1083 } else if (result == ISC_R_NOTFOUND) {
1084 result = query_getcachedb(client, name, qtype, dbp, options);
1085 *is_zonep = ISC_FALSE;
1090 static inline isc_boolean_t
1091 query_isduplicate(ns_client_t *client, dns_name_t *name,
1092 dns_rdatatype_t type, dns_name_t **mnamep)
1094 dns_section_t section;
1095 dns_name_t *mname = NULL;
1096 isc_result_t result;
1098 CTRACE("query_isduplicate");
1100 for (section = DNS_SECTION_ANSWER;
1101 section <= DNS_SECTION_ADDITIONAL;
1103 result = dns_message_findname(client->message, section,
1104 name, type, 0, &mname, NULL);
1105 if (result == ISC_R_SUCCESS) {
1107 * We've already got this RRset in the response.
1109 CTRACE("query_isduplicate: true: done");
1111 } else if (result == DNS_R_NXRRSET) {
1113 * The name exists, but the rdataset does not.
1115 if (section == DNS_SECTION_ADDITIONAL)
1118 RUNTIME_CHECK(result == DNS_R_NXDOMAIN);
1125 CTRACE("query_isduplicate: false: done");
1130 query_addadditional(void *arg, dns_name_t *name, dns_rdatatype_t qtype) {
1131 ns_client_t *client = arg;
1132 isc_result_t result, eresult;
1135 dns_name_t *fname, *mname;
1136 dns_rdataset_t *rdataset, *sigrdataset, *trdataset;
1139 dns_dbversion_t *version;
1140 isc_boolean_t added_something, need_addname;
1142 dns_rdatatype_t type;
1144 REQUIRE(NS_CLIENT_VALID(client));
1145 REQUIRE(qtype != dns_rdatatype_any);
1147 if (!WANTDNSSEC(client) && dns_rdatatype_isdnssec(qtype))
1148 return (ISC_R_SUCCESS);
1150 CTRACE("query_addadditional");
1155 eresult = ISC_R_SUCCESS;
1163 added_something = ISC_FALSE;
1164 need_addname = ISC_FALSE;
1168 * We treat type A additional section processing as if it
1169 * were "any address type" additional section processing.
1170 * To avoid multiple lookups, we do an 'any' database
1171 * lookup and iterate over the node.
1173 if (qtype == dns_rdatatype_a)
1174 type = dns_rdatatype_any;
1179 * Get some resources.
1181 dbuf = query_getnamebuf(client);
1184 fname = query_newname(client, dbuf, &b);
1185 rdataset = query_newrdataset(client);
1186 if (fname == NULL || rdataset == NULL)
1188 if (WANTDNSSEC(client)) {
1189 sigrdataset = query_newrdataset(client);
1190 if (sigrdataset == NULL)
1195 * Look for a zone database that might contain authoritative
1198 result = query_getzonedb(client, name, qtype, DNS_GETDB_NOLOG,
1199 &zone, &db, &version);
1200 if (result != ISC_R_SUCCESS)
1203 CTRACE("query_addadditional: db_find");
1206 * Since we are looking for authoritative data, we do not set
1207 * the GLUEOK flag. Glue will be looked for later, but not
1208 * necessarily in the same database.
1211 result = dns_db_find(db, name, version, type, client->query.dboptions,
1212 client->now, &node, fname, rdataset,
1214 if (result == ISC_R_SUCCESS) {
1215 if (sigrdataset != NULL && !dns_db_issecure(db) &&
1216 dns_rdataset_isassociated(sigrdataset))
1217 dns_rdataset_disassociate(sigrdataset);
1221 if (dns_rdataset_isassociated(rdataset))
1222 dns_rdataset_disassociate(rdataset);
1223 if (sigrdataset != NULL && dns_rdataset_isassociated(sigrdataset))
1224 dns_rdataset_disassociate(sigrdataset);
1226 dns_db_detachnode(db, &node);
1231 * No authoritative data was found. The cache is our next best bet.
1235 result = query_getcachedb(client, name, qtype, &db, DNS_GETDB_NOLOG);
1236 if (result != ISC_R_SUCCESS)
1238 * Most likely the client isn't allowed to query the cache.
1242 * Attempt to validate glue.
1244 if (sigrdataset == NULL) {
1245 sigrdataset = query_newrdataset(client);
1246 if (sigrdataset == NULL)
1249 result = dns_db_find(db, name, version, type,
1250 client->query.dboptions |
1251 DNS_DBFIND_GLUEOK | DNS_DBFIND_ADDITIONALOK,
1252 client->now, &node, fname, rdataset,
1254 if (result == DNS_R_GLUE &&
1255 validate(client, db, fname, rdataset, sigrdataset))
1256 result = ISC_R_SUCCESS;
1257 if (!WANTDNSSEC(client))
1258 query_putrdataset(client, &sigrdataset);
1259 if (result == ISC_R_SUCCESS)
1262 if (dns_rdataset_isassociated(rdataset))
1263 dns_rdataset_disassociate(rdataset);
1264 if (sigrdataset != NULL && dns_rdataset_isassociated(sigrdataset))
1265 dns_rdataset_disassociate(sigrdataset);
1267 dns_db_detachnode(db, &node);
1272 * No cached data was found. Glue is our last chance.
1275 * NS records cause both the usual additional section
1276 * processing to locate a type A record, and, when used
1277 * in a referral, a special search of the zone in which
1278 * they reside for glue information.
1280 * This is the "special search". Note that we must search
1281 * the zone where the NS record resides, not the zone it
1282 * points to, and that we only do the search in the delegation
1283 * case (identified by client->query.gluedb being set).
1286 if (client->query.gluedb == NULL)
1290 * Don't poison caches using the bailiwick protection model.
1292 if (!dns_name_issubdomain(name, dns_db_origin(client->query.gluedb)))
1295 dns_db_attach(client->query.gluedb, &db);
1296 result = dns_db_find(db, name, version, type,
1297 client->query.dboptions | DNS_DBFIND_GLUEOK,
1298 client->now, &node, fname, rdataset,
1300 if (!(result == ISC_R_SUCCESS ||
1301 result == DNS_R_ZONECUT ||
1302 result == DNS_R_GLUE))
1307 * We have found a potential additional data rdataset, or
1308 * at least a node to iterate over.
1310 query_keepname(client, fname, dbuf);
1313 * If we have an rdataset, add it to the additional data
1317 if (dns_rdataset_isassociated(rdataset) &&
1318 !query_isduplicate(client, fname, type, &mname)) {
1319 if (mname != NULL) {
1320 INSIST(mname != fname);
1321 query_releasename(client, &fname);
1324 need_addname = ISC_TRUE;
1325 ISC_LIST_APPEND(fname->list, rdataset, link);
1326 trdataset = rdataset;
1328 added_something = ISC_TRUE;
1330 * Note: we only add SIGs if we've added the type they cover,
1331 * so we do not need to check if the SIG rdataset is already
1334 if (sigrdataset != NULL &&
1335 dns_rdataset_isassociated(sigrdataset))
1337 ISC_LIST_APPEND(fname->list, sigrdataset, link);
1342 if (qtype == dns_rdatatype_a) {
1343 #ifdef ALLOW_FILTER_AAAA_ON_V4
1344 isc_boolean_t have_a = ISC_FALSE;
1348 * We now go looking for A and AAAA records, along with
1351 * XXXRTH This code could be more efficient.
1353 if (rdataset != NULL) {
1354 if (dns_rdataset_isassociated(rdataset))
1355 dns_rdataset_disassociate(rdataset);
1357 rdataset = query_newrdataset(client);
1358 if (rdataset == NULL)
1361 if (sigrdataset != NULL) {
1362 if (dns_rdataset_isassociated(sigrdataset))
1363 dns_rdataset_disassociate(sigrdataset);
1364 } else if (WANTDNSSEC(client)) {
1365 sigrdataset = query_newrdataset(client);
1366 if (sigrdataset == NULL)
1369 if (query_isduplicate(client, fname, dns_rdatatype_a, NULL))
1371 result = dns_db_findrdataset(db, node, version,
1373 client->now, rdataset,
1375 if (result == DNS_R_NCACHENXDOMAIN)
1377 if (result == DNS_R_NCACHENXRRSET) {
1378 dns_rdataset_disassociate(rdataset);
1379 if (sigrdataset != NULL &&
1380 dns_rdataset_isassociated(sigrdataset))
1381 dns_rdataset_disassociate(sigrdataset);
1383 if (result == ISC_R_SUCCESS) {
1385 #ifdef ALLOW_FILTER_AAAA_ON_V4
1388 if (!query_isduplicate(client, fname,
1389 dns_rdatatype_a, &mname)) {
1390 if (mname != fname) {
1391 if (mname != NULL) {
1392 query_releasename(client, &fname);
1395 need_addname = ISC_TRUE;
1397 ISC_LIST_APPEND(fname->list, rdataset, link);
1398 added_something = ISC_TRUE;
1399 if (sigrdataset != NULL &&
1400 dns_rdataset_isassociated(sigrdataset))
1402 ISC_LIST_APPEND(fname->list,
1405 query_newrdataset(client);
1407 rdataset = query_newrdataset(client);
1408 if (rdataset == NULL)
1410 if (WANTDNSSEC(client) && sigrdataset == NULL)
1413 dns_rdataset_disassociate(rdataset);
1414 if (sigrdataset != NULL &&
1415 dns_rdataset_isassociated(sigrdataset))
1416 dns_rdataset_disassociate(sigrdataset);
1420 if (query_isduplicate(client, fname, dns_rdatatype_aaaa, NULL))
1422 result = dns_db_findrdataset(db, node, version,
1423 dns_rdatatype_aaaa, 0,
1424 client->now, rdataset,
1426 if (result == DNS_R_NCACHENXDOMAIN)
1428 if (result == DNS_R_NCACHENXRRSET) {
1429 dns_rdataset_disassociate(rdataset);
1430 if (sigrdataset != NULL &&
1431 dns_rdataset_isassociated(sigrdataset))
1432 dns_rdataset_disassociate(sigrdataset);
1434 if (result == ISC_R_SUCCESS) {
1437 * There's an A; check whether we're filtering AAAA
1439 #ifdef ALLOW_FILTER_AAAA_ON_V4
1441 (client->filter_aaaa == dns_v4_aaaa_break_dnssec ||
1442 (client->filter_aaaa == dns_v4_aaaa_filter &&
1443 (!WANTDNSSEC(client) || sigrdataset == NULL ||
1444 !dns_rdataset_isassociated(sigrdataset)))))
1447 if (!query_isduplicate(client, fname,
1448 dns_rdatatype_aaaa, &mname)) {
1449 if (mname != fname) {
1450 if (mname != NULL) {
1451 query_releasename(client, &fname);
1454 need_addname = ISC_TRUE;
1456 ISC_LIST_APPEND(fname->list, rdataset, link);
1457 added_something = ISC_TRUE;
1458 if (sigrdataset != NULL &&
1459 dns_rdataset_isassociated(sigrdataset))
1461 ISC_LIST_APPEND(fname->list,
1471 CTRACE("query_addadditional: addname");
1473 * If we haven't added anything, then we're done.
1475 if (!added_something)
1479 * We may have added our rdatasets to an existing name, if so, then
1480 * need_addname will be ISC_FALSE. Whether we used an existing name
1481 * or a new one, we must set fname to NULL to prevent cleanup.
1484 dns_message_addname(client->message, fname,
1485 DNS_SECTION_ADDITIONAL);
1489 * In a few cases, we want to add additional data for additional
1490 * data. It's simpler to just deal with special cases here than
1491 * to try to create a general purpose mechanism and allow the
1492 * rdata implementations to do it themselves.
1494 * This involves recursion, but the depth is limited. The
1495 * most complex case is adding a SRV rdataset, which involves
1496 * recursing to add address records, which in turn can cause
1497 * recursion to add KEYs.
1499 if (type == dns_rdatatype_srv && trdataset != NULL) {
1501 * If we're adding SRV records to the additional data
1502 * section, it's helpful if we add the SRV additional data
1505 eresult = dns_rdataset_additionaldata(trdataset,
1506 query_addadditional,
1511 CTRACE("query_addadditional: cleanup");
1512 query_putrdataset(client, &rdataset);
1513 if (sigrdataset != NULL)
1514 query_putrdataset(client, &sigrdataset);
1516 query_releasename(client, &fname);
1518 dns_db_detachnode(db, &node);
1522 dns_zone_detach(&zone);
1524 CTRACE("query_addadditional: done");
1529 query_discardcache(ns_client_t *client, dns_rdataset_t *rdataset_base,
1530 dns_rdatasetadditional_t additionaltype,
1531 dns_rdatatype_t type, dns_zone_t **zonep, dns_db_t **dbp,
1532 dns_dbversion_t **versionp, dns_dbnode_t **nodep,
1535 dns_rdataset_t *rdataset;
1537 while ((rdataset = ISC_LIST_HEAD(fname->list)) != NULL) {
1538 ISC_LIST_UNLINK(fname->list, rdataset, link);
1539 query_putrdataset(client, &rdataset);
1541 if (*versionp != NULL)
1542 dns_db_closeversion(*dbp, versionp, ISC_FALSE);
1544 dns_db_detachnode(*dbp, nodep);
1548 dns_zone_detach(zonep);
1549 (void)dns_rdataset_putadditional(client->view->acache, rdataset_base,
1550 additionaltype, type);
1553 static inline isc_result_t
1554 query_iscachevalid(dns_zone_t *zone, dns_db_t *db, dns_db_t *db0,
1555 dns_dbversion_t *version)
1557 isc_result_t result = ISC_R_SUCCESS;
1558 dns_dbversion_t *version_current = NULL;
1559 dns_db_t *db_current = db0;
1561 if (db_current == NULL) {
1562 result = dns_zone_getdb(zone, &db_current);
1563 if (result != ISC_R_SUCCESS)
1566 dns_db_currentversion(db_current, &version_current);
1567 if (db_current != db || version_current != version) {
1568 result = ISC_R_FAILURE;
1573 dns_db_closeversion(db_current, &version_current, ISC_FALSE);
1574 if (db0 == NULL && db_current != NULL)
1575 dns_db_detach(&db_current);
1581 query_addadditional2(void *arg, dns_name_t *name, dns_rdatatype_t qtype) {
1582 client_additionalctx_t *additionalctx = arg;
1583 dns_rdataset_t *rdataset_base;
1584 ns_client_t *client;
1585 isc_result_t result, eresult;
1586 dns_dbnode_t *node, *cnode;
1588 dns_name_t *fname, *mname0, cfname;
1589 dns_rdataset_t *rdataset, *sigrdataset;
1590 dns_rdataset_t *crdataset, *crdataset_next;
1593 dns_dbversion_t *version, *cversion;
1594 isc_boolean_t added_something, need_addname, needadditionalcache;
1595 isc_boolean_t need_sigrrset;
1597 dns_rdatatype_t type;
1598 dns_rdatasetadditional_t additionaltype;
1601 * If we don't have an additional cache call query_addadditional.
1603 client = additionalctx->client;
1604 REQUIRE(NS_CLIENT_VALID(client));
1606 if (qtype != dns_rdatatype_a || client->view->acache == NULL) {
1608 * This function is optimized for "address" types. For other
1609 * types, use a generic routine.
1610 * XXX: ideally, this function should be generic enough.
1612 return (query_addadditional(additionalctx->client,
1619 rdataset_base = additionalctx->rdataset;
1620 eresult = ISC_R_SUCCESS;
1630 added_something = ISC_FALSE;
1631 need_addname = ISC_FALSE;
1633 needadditionalcache = ISC_FALSE;
1634 POST(needadditionalcache);
1635 additionaltype = dns_rdatasetadditional_fromauth;
1636 dns_name_init(&cfname, NULL);
1638 CTRACE("query_addadditional2");
1641 * We treat type A additional section processing as if it
1642 * were "any address type" additional section processing.
1643 * To avoid multiple lookups, we do an 'any' database
1644 * lookup and iterate over the node.
1645 * XXXJT: this approach can cause a suboptimal result when the cache
1646 * DB only has partial address types and the glue DB has remaining
1649 type = dns_rdatatype_any;
1652 * Get some resources.
1654 dbuf = query_getnamebuf(client);
1657 fname = query_newname(client, dbuf, &b);
1660 dns_name_setbuffer(&cfname, &b); /* share the buffer */
1662 /* Check additional cache */
1663 result = dns_rdataset_getadditional(rdataset_base, additionaltype,
1664 type, client->view->acache, &zone,
1665 &cdb, &cversion, &cnode, &cfname,
1666 client->message, client->now);
1667 if (result != ISC_R_SUCCESS)
1670 CTRACE("query_addadditional2: auth zone not found");
1674 /* Is the cached DB up-to-date? */
1675 result = query_iscachevalid(zone, cdb, NULL, cversion);
1676 if (result != ISC_R_SUCCESS) {
1677 CTRACE("query_addadditional2: old auth additional cache");
1678 query_discardcache(client, rdataset_base, additionaltype,
1679 type, &zone, &cdb, &cversion, &cnode,
1684 if (cnode == NULL) {
1686 * We have a negative cache. We don't have to check the zone
1687 * ACL, since the result (not using this zone) would be same
1688 * regardless of the result.
1690 CTRACE("query_addadditional2: negative auth additional cache");
1691 dns_db_closeversion(cdb, &cversion, ISC_FALSE);
1692 dns_db_detach(&cdb);
1693 dns_zone_detach(&zone);
1697 result = query_validatezonedb(client, name, qtype, DNS_GETDB_NOLOG,
1699 if (result != ISC_R_SUCCESS) {
1700 query_discardcache(client, rdataset_base, additionaltype,
1701 type, &zone, &cdb, &cversion, &cnode,
1706 /* We've got an active cache. */
1707 CTRACE("query_addadditional2: auth additional cache");
1708 dns_db_closeversion(cdb, &cversion, ISC_FALSE);
1711 dns_name_clone(&cfname, fname);
1712 query_keepname(client, fname, dbuf);
1716 * Look for a zone database that might contain authoritative
1720 result = query_getzonedb(client, name, qtype, DNS_GETDB_NOLOG,
1721 &zone, &db, &version);
1722 if (result != ISC_R_SUCCESS) {
1723 /* Cache the negative result */
1724 (void)dns_rdataset_setadditional(rdataset_base, additionaltype,
1725 type, client->view->acache,
1726 NULL, NULL, NULL, NULL,
1731 CTRACE("query_addadditional2: db_find");
1734 * Since we are looking for authoritative data, we do not set
1735 * the GLUEOK flag. Glue will be looked for later, but not
1736 * necessarily in the same database.
1739 result = dns_db_find(db, name, version, type, client->query.dboptions,
1740 client->now, &node, fname, NULL, NULL);
1741 if (result == ISC_R_SUCCESS)
1744 /* Cache the negative result */
1745 (void)dns_rdataset_setadditional(rdataset_base, additionaltype,
1746 type, client->view->acache, zone, db,
1747 version, NULL, fname);
1750 dns_db_detachnode(db, &node);
1755 * No authoritative data was found. The cache is our next best bet.
1759 additionaltype = dns_rdatasetadditional_fromcache;
1760 result = query_getcachedb(client, name, qtype, &db, DNS_GETDB_NOLOG);
1761 if (result != ISC_R_SUCCESS)
1763 * Most likely the client isn't allowed to query the cache.
1767 result = dns_db_find(db, name, version, type,
1768 client->query.dboptions |
1769 DNS_DBFIND_GLUEOK | DNS_DBFIND_ADDITIONALOK,
1770 client->now, &node, fname, NULL, NULL);
1771 if (result == ISC_R_SUCCESS)
1775 dns_db_detachnode(db, &node);
1780 * No cached data was found. Glue is our last chance.
1783 * NS records cause both the usual additional section
1784 * processing to locate a type A record, and, when used
1785 * in a referral, a special search of the zone in which
1786 * they reside for glue information.
1788 * This is the "special search". Note that we must search
1789 * the zone where the NS record resides, not the zone it
1790 * points to, and that we only do the search in the delegation
1791 * case (identified by client->query.gluedb being set).
1793 if (client->query.gluedb == NULL)
1797 * Don't poison caches using the bailiwick protection model.
1799 if (!dns_name_issubdomain(name, dns_db_origin(client->query.gluedb)))
1802 /* Check additional cache */
1803 additionaltype = dns_rdatasetadditional_fromglue;
1804 result = dns_rdataset_getadditional(rdataset_base, additionaltype,
1805 type, client->view->acache, NULL,
1806 &cdb, &cversion, &cnode, &cfname,
1807 client->message, client->now);
1808 if (result != ISC_R_SUCCESS)
1811 result = query_iscachevalid(zone, cdb, client->query.gluedb, cversion);
1812 if (result != ISC_R_SUCCESS) {
1813 CTRACE("query_addadditional2: old glue additional cache");
1814 query_discardcache(client, rdataset_base, additionaltype,
1815 type, &zone, &cdb, &cversion, &cnode,
1820 if (cnode == NULL) {
1821 /* We have a negative cache. */
1822 CTRACE("query_addadditional2: negative glue additional cache");
1823 dns_db_closeversion(cdb, &cversion, ISC_FALSE);
1824 dns_db_detach(&cdb);
1829 CTRACE("query_addadditional2: glue additional cache");
1830 dns_db_closeversion(cdb, &cversion, ISC_FALSE);
1833 dns_name_clone(&cfname, fname);
1834 query_keepname(client, fname, dbuf);
1838 dns_db_attach(client->query.gluedb, &db);
1839 result = dns_db_find(db, name, version, type,
1840 client->query.dboptions | DNS_DBFIND_GLUEOK,
1841 client->now, &node, fname, NULL, NULL);
1842 if (!(result == ISC_R_SUCCESS ||
1843 result == DNS_R_ZONECUT ||
1844 result == DNS_R_GLUE)) {
1845 /* cache the negative result */
1846 (void)dns_rdataset_setadditional(rdataset_base, additionaltype,
1847 type, client->view->acache,
1848 NULL, db, version, NULL,
1855 * We have found a DB node to iterate over from a DB.
1856 * We are going to look for address RRsets (i.e., A and AAAA) in the DB
1857 * node we've just found. We'll then store the complete information
1858 * in the additional data cache.
1860 dns_name_clone(fname, &cfname);
1861 query_keepname(client, fname, dbuf);
1862 needadditionalcache = ISC_TRUE;
1864 rdataset = query_newrdataset(client);
1865 if (rdataset == NULL)
1868 sigrdataset = query_newrdataset(client);
1869 if (sigrdataset == NULL)
1872 if (additionaltype == dns_rdatasetadditional_fromcache &&
1873 query_isduplicate(client, fname, dns_rdatatype_a, NULL))
1876 * Find A RRset with sig RRset. Even if we don't find a sig RRset
1877 * for a client using DNSSEC, we'll continue the process to make a
1878 * complete list to be cached. However, we need to cancel the
1879 * caching when something unexpected happens, in order to avoid
1880 * caching incomplete information.
1882 result = dns_db_findrdataset(db, node, version, dns_rdatatype_a, 0,
1883 client->now, rdataset, sigrdataset);
1885 * If we can't promote glue/pending from the cache to secure
1888 if (result == ISC_R_SUCCESS &&
1889 additionaltype == dns_rdatasetadditional_fromcache &&
1890 (DNS_TRUST_PENDING(rdataset->trust) ||
1891 DNS_TRUST_GLUE(rdataset->trust)) &&
1892 !validate(client, db, fname, rdataset, sigrdataset)) {
1893 dns_rdataset_disassociate(rdataset);
1894 if (dns_rdataset_isassociated(sigrdataset))
1895 dns_rdataset_disassociate(sigrdataset);
1896 result = ISC_R_NOTFOUND;
1898 if (result == DNS_R_NCACHENXDOMAIN)
1900 if (result == DNS_R_NCACHENXRRSET) {
1901 dns_rdataset_disassociate(rdataset);
1902 if (dns_rdataset_isassociated(sigrdataset))
1903 dns_rdataset_disassociate(sigrdataset);
1905 if (result == ISC_R_SUCCESS) {
1906 /* Remember the result as a cache */
1907 ISC_LIST_APPEND(cfname.list, rdataset, link);
1908 if (dns_rdataset_isassociated(sigrdataset)) {
1909 ISC_LIST_APPEND(cfname.list, sigrdataset, link);
1910 sigrdataset = query_newrdataset(client);
1912 rdataset = query_newrdataset(client);
1913 if (sigrdataset == NULL || rdataset == NULL) {
1914 /* do not cache incomplete information */
1920 if (additionaltype == dns_rdatasetadditional_fromcache &&
1921 query_isduplicate(client, fname, dns_rdatatype_aaaa, NULL))
1923 /* Find AAAA RRset with sig RRset */
1924 result = dns_db_findrdataset(db, node, version, dns_rdatatype_aaaa,
1925 0, client->now, rdataset, sigrdataset);
1927 * If we can't promote glue/pending from the cache to secure
1930 if (result == ISC_R_SUCCESS &&
1931 additionaltype == dns_rdatasetadditional_fromcache &&
1932 (DNS_TRUST_PENDING(rdataset->trust) ||
1933 DNS_TRUST_GLUE(rdataset->trust)) &&
1934 !validate(client, db, fname, rdataset, sigrdataset)) {
1935 dns_rdataset_disassociate(rdataset);
1936 if (dns_rdataset_isassociated(sigrdataset))
1937 dns_rdataset_disassociate(sigrdataset);
1938 result = ISC_R_NOTFOUND;
1940 if (result == ISC_R_SUCCESS) {
1941 ISC_LIST_APPEND(cfname.list, rdataset, link);
1943 if (dns_rdataset_isassociated(sigrdataset)) {
1944 ISC_LIST_APPEND(cfname.list, sigrdataset, link);
1951 * Set the new result in the cache if required. We do not support
1952 * caching additional data from a cache DB.
1954 if (needadditionalcache == ISC_TRUE &&
1955 (additionaltype == dns_rdatasetadditional_fromauth ||
1956 additionaltype == dns_rdatasetadditional_fromglue)) {
1957 (void)dns_rdataset_setadditional(rdataset_base, additionaltype,
1958 type, client->view->acache,
1959 zone, db, version, node,
1964 need_sigrrset = ISC_FALSE;
1966 for (crdataset = ISC_LIST_HEAD(cfname.list);
1968 crdataset = crdataset_next) {
1971 crdataset_next = ISC_LIST_NEXT(crdataset, link);
1974 if (crdataset->type == dns_rdatatype_a ||
1975 crdataset->type == dns_rdatatype_aaaa) {
1976 if (!query_isduplicate(client, fname, crdataset->type,
1978 if (mname != fname) {
1979 if (mname != NULL) {
1981 * A different type of this name is
1982 * already stored in the additional
1983 * section. We'll reuse the name.
1984 * Note that this should happen at most
1985 * once. Otherwise, fname->link could
1988 INSIST(mname0 == NULL);
1990 query_releasename(client, &fname);
1994 need_addname = ISC_TRUE;
1996 ISC_LIST_UNLINK(cfname.list, crdataset, link);
1997 ISC_LIST_APPEND(fname->list, crdataset, link);
1998 added_something = ISC_TRUE;
1999 need_sigrrset = ISC_TRUE;
2001 need_sigrrset = ISC_FALSE;
2002 } else if (crdataset->type == dns_rdatatype_rrsig &&
2003 need_sigrrset && WANTDNSSEC(client)) {
2004 ISC_LIST_UNLINK(cfname.list, crdataset, link);
2005 ISC_LIST_APPEND(fname->list, crdataset, link);
2006 added_something = ISC_TRUE; /* just in case */
2007 need_sigrrset = ISC_FALSE;
2011 CTRACE("query_addadditional2: addname");
2014 * If we haven't added anything, then we're done.
2016 if (!added_something)
2020 * We may have added our rdatasets to an existing name, if so, then
2021 * need_addname will be ISC_FALSE. Whether we used an existing name
2022 * or a new one, we must set fname to NULL to prevent cleanup.
2025 dns_message_addname(client->message, fname,
2026 DNS_SECTION_ADDITIONAL);
2030 CTRACE("query_addadditional2: cleanup");
2032 if (rdataset != NULL)
2033 query_putrdataset(client, &rdataset);
2034 if (sigrdataset != NULL)
2035 query_putrdataset(client, &sigrdataset);
2036 while ((crdataset = ISC_LIST_HEAD(cfname.list)) != NULL) {
2037 ISC_LIST_UNLINK(cfname.list, crdataset, link);
2038 query_putrdataset(client, &crdataset);
2041 query_releasename(client, &fname);
2043 dns_db_detachnode(db, &node);
2047 dns_zone_detach(&zone);
2049 CTRACE("query_addadditional2: done");
2054 query_addrdataset(ns_client_t *client, dns_name_t *fname,
2055 dns_rdataset_t *rdataset)
2057 client_additionalctx_t additionalctx;
2060 * Add 'rdataset' and any pertinent additional data to
2061 * 'fname', a name in the response message for 'client'.
2064 CTRACE("query_addrdataset");
2066 ISC_LIST_APPEND(fname->list, rdataset, link);
2068 if (client->view->order != NULL)
2069 rdataset->attributes |= dns_order_find(client->view->order,
2070 fname, rdataset->type,
2072 rdataset->attributes |= DNS_RDATASETATTR_LOADORDER;
2074 if (NOADDITIONAL(client))
2078 * Add additional data.
2080 * We don't care if dns_rdataset_additionaldata() fails.
2082 additionalctx.client = client;
2083 additionalctx.rdataset = rdataset;
2084 (void)dns_rdataset_additionaldata(rdataset, query_addadditional2,
2086 CTRACE("query_addrdataset: done");
2090 query_dns64(ns_client_t *client, dns_name_t **namep, dns_rdataset_t *rdataset,
2091 dns_rdataset_t *sigrdataset, isc_buffer_t *dbuf,
2092 dns_section_t section)
2094 dns_name_t *name, *mname;
2095 dns_rdata_t *dns64_rdata;
2096 dns_rdata_t rdata = DNS_RDATA_INIT;
2097 dns_rdatalist_t *dns64_rdatalist;
2098 dns_rdataset_t *dns64_rdataset;
2099 dns_rdataset_t *mrdataset;
2100 isc_buffer_t *buffer;
2102 isc_result_t result;
2103 dns_view_t *view = client->view;
2104 isc_netaddr_t netaddr;
2106 unsigned int flags = 0;
2109 * To the current response for 'client', add the answer RRset
2110 * '*rdatasetp' and an optional signature set '*sigrdatasetp', with
2111 * owner name '*namep', to section 'section', unless they are
2112 * already there. Also add any pertinent additional data.
2114 * If 'dbuf' is not NULL, then '*namep' is the name whose data is
2115 * stored in 'dbuf'. In this case, query_addrrset() guarantees that
2116 * when it returns the name will either have been kept or released.
2118 CTRACE("query_dns64");
2124 dns64_rdataset = NULL;
2125 dns64_rdatalist = NULL;
2126 result = dns_message_findname(client->message, section,
2127 name, dns_rdatatype_aaaa,
2129 &mname, &mrdataset);
2130 if (result == ISC_R_SUCCESS) {
2132 * We've already got an RRset of the given name and type.
2133 * There's nothing else to do;
2135 CTRACE("query_dns64: dns_message_findname succeeded: done");
2137 query_releasename(client, namep);
2138 return (ISC_R_SUCCESS);
2139 } else if (result == DNS_R_NXDOMAIN) {
2141 * The name doesn't exist.
2144 query_keepname(client, name, dbuf);
2145 dns_message_addname(client->message, name, section);
2149 RUNTIME_CHECK(result == DNS_R_NXRRSET);
2151 query_releasename(client, namep);
2154 if (rdataset->trust != dns_trust_secure &&
2155 (section == DNS_SECTION_ANSWER ||
2156 section == DNS_SECTION_AUTHORITY))
2157 client->query.attributes &= ~NS_QUERYATTR_SECURE;
2159 isc_netaddr_fromsockaddr(&netaddr, &client->peeraddr);
2161 result = isc_buffer_allocate(client->mctx, &buffer, view->dns64cnt *
2162 16 * dns_rdataset_count(rdataset));
2163 if (result != ISC_R_SUCCESS)
2165 result = dns_message_gettemprdataset(client->message, &dns64_rdataset);
2166 if (result != ISC_R_SUCCESS)
2168 result = dns_message_gettemprdatalist(client->message,
2170 if (result != ISC_R_SUCCESS)
2173 dns_rdataset_init(dns64_rdataset);
2174 dns_rdatalist_init(dns64_rdatalist);
2175 dns64_rdatalist->rdclass = dns_rdataclass_in;
2176 dns64_rdatalist->type = dns_rdatatype_aaaa;
2177 if (client->query.dns64_ttl != ISC_UINT32_MAX)
2178 dns64_rdatalist->ttl = ISC_MIN(rdataset->ttl,
2179 client->query.dns64_ttl);
2181 dns64_rdatalist->ttl = ISC_MIN(rdataset->ttl, 600);
2183 if (RECURSIONOK(client))
2184 flags |= DNS_DNS64_RECURSIVE;
2187 * We use the signatures from the A lookup to set DNS_DNS64_DNSSEC
2188 * as this provides a easy way to see if the answer was signed.
2190 if (sigrdataset != NULL && dns_rdataset_isassociated(sigrdataset))
2191 flags |= DNS_DNS64_DNSSEC;
2193 for (result = dns_rdataset_first(rdataset);
2194 result == ISC_R_SUCCESS;
2195 result = dns_rdataset_next(rdataset)) {
2196 for (dns64 = ISC_LIST_HEAD(client->view->dns64);
2197 dns64 != NULL; dns64 = dns_dns64_next(dns64)) {
2199 dns_rdataset_current(rdataset, &rdata);
2200 isc__buffer_availableregion(buffer, &r);
2201 INSIST(r.length >= 16);
2202 result = dns_dns64_aaaafroma(dns64, &netaddr,
2204 &ns_g_server->aclenv,
2205 flags, rdata.data, r.base);
2206 if (result != ISC_R_SUCCESS) {
2207 dns_rdata_reset(&rdata);
2210 isc_buffer_add(buffer, 16);
2211 isc_buffer_remainingregion(buffer, &r);
2212 isc_buffer_forward(buffer, 16);
2213 result = dns_message_gettemprdata(client->message,
2215 if (result != ISC_R_SUCCESS)
2217 dns_rdata_init(dns64_rdata);
2218 dns_rdata_fromregion(dns64_rdata, dns_rdataclass_in,
2219 dns_rdatatype_aaaa, &r);
2220 ISC_LIST_APPEND(dns64_rdatalist->rdata, dns64_rdata,
2223 dns_rdata_reset(&rdata);
2226 if (result != ISC_R_NOMORE)
2229 if (ISC_LIST_EMPTY(dns64_rdatalist->rdata))
2232 result = dns_rdatalist_tordataset(dns64_rdatalist, dns64_rdataset);
2233 if (result != ISC_R_SUCCESS)
2235 client->query.attributes |= NS_QUERYATTR_NOADDITIONAL;
2236 dns64_rdataset->trust = rdataset->trust;
2237 query_addrdataset(client, mname, dns64_rdataset);
2238 dns64_rdataset = NULL;
2239 dns64_rdatalist = NULL;
2240 dns_message_takebuffer(client->message, &buffer);
2241 result = ISC_R_SUCCESS;
2245 isc_buffer_free(&buffer);
2247 if (dns64_rdata != NULL)
2248 dns_message_puttemprdata(client->message, &dns64_rdata);
2250 if (dns64_rdataset != NULL)
2251 dns_message_puttemprdataset(client->message, &dns64_rdataset);
2253 if (dns64_rdatalist != NULL) {
2254 for (dns64_rdata = ISC_LIST_HEAD(dns64_rdatalist->rdata);
2255 dns64_rdata != NULL;
2256 dns64_rdata = ISC_LIST_HEAD(dns64_rdatalist->rdata))
2258 ISC_LIST_UNLINK(dns64_rdatalist->rdata,
2260 dns_message_puttemprdata(client->message, &dns64_rdata);
2262 dns_message_puttemprdatalist(client->message, &dns64_rdatalist);
2265 CTRACE("query_dns64: done");
2270 query_filter64(ns_client_t *client, dns_name_t **namep,
2271 dns_rdataset_t *rdataset, isc_buffer_t *dbuf,
2272 dns_section_t section)
2274 dns_name_t *name, *mname;
2275 dns_rdata_t *myrdata;
2276 dns_rdata_t rdata = DNS_RDATA_INIT;
2277 dns_rdatalist_t *myrdatalist;
2278 dns_rdataset_t *myrdataset;
2279 isc_buffer_t *buffer;
2281 isc_result_t result;
2284 CTRACE("query_filter64");
2286 INSIST(client->query.dns64_aaaaok != NULL);
2287 INSIST(client->query.dns64_aaaaoklen == dns_rdataset_count(rdataset));
2295 result = dns_message_findname(client->message, section,
2296 name, dns_rdatatype_aaaa,
2298 &mname, &myrdataset);
2299 if (result == ISC_R_SUCCESS) {
2301 * We've already got an RRset of the given name and type.
2302 * There's nothing else to do;
2304 CTRACE("query_filter64: dns_message_findname succeeded: done");
2306 query_releasename(client, namep);
2308 } else if (result == DNS_R_NXDOMAIN) {
2312 RUNTIME_CHECK(result == DNS_R_NXRRSET);
2314 query_releasename(client, namep);
2318 if (rdataset->trust != dns_trust_secure &&
2319 (section == DNS_SECTION_ANSWER ||
2320 section == DNS_SECTION_AUTHORITY))
2321 client->query.attributes &= ~NS_QUERYATTR_SECURE;
2323 result = isc_buffer_allocate(client->mctx, &buffer,
2324 16 * dns_rdataset_count(rdataset));
2325 if (result != ISC_R_SUCCESS)
2327 result = dns_message_gettemprdataset(client->message, &myrdataset);
2328 if (result != ISC_R_SUCCESS)
2330 result = dns_message_gettemprdatalist(client->message, &myrdatalist);
2331 if (result != ISC_R_SUCCESS)
2334 dns_rdataset_init(myrdataset);
2335 dns_rdatalist_init(myrdatalist);
2336 myrdatalist->rdclass = dns_rdataclass_in;
2337 myrdatalist->type = dns_rdatatype_aaaa;
2338 myrdatalist->ttl = rdataset->ttl;
2341 for (result = dns_rdataset_first(rdataset);
2342 result == ISC_R_SUCCESS;
2343 result = dns_rdataset_next(rdataset)) {
2344 if (!client->query.dns64_aaaaok[i++])
2346 dns_rdataset_current(rdataset, &rdata);
2347 INSIST(rdata.length == 16);
2348 isc_buffer_putmem(buffer, rdata.data, rdata.length);
2349 isc_buffer_remainingregion(buffer, &r);
2350 isc_buffer_forward(buffer, rdata.length);
2351 result = dns_message_gettemprdata(client->message, &myrdata);
2352 if (result != ISC_R_SUCCESS)
2354 dns_rdata_init(myrdata);
2355 dns_rdata_fromregion(myrdata, dns_rdataclass_in,
2356 dns_rdatatype_aaaa, &r);
2357 ISC_LIST_APPEND(myrdatalist->rdata, myrdata, link);
2359 dns_rdata_reset(&rdata);
2361 if (result != ISC_R_NOMORE)
2364 result = dns_rdatalist_tordataset(myrdatalist, myrdataset);
2365 if (result != ISC_R_SUCCESS)
2367 client->query.attributes |= NS_QUERYATTR_NOADDITIONAL;
2368 if (mname == name) {
2370 query_keepname(client, name, dbuf);
2371 dns_message_addname(client->message, name, section);
2374 myrdataset->trust = rdataset->trust;
2375 query_addrdataset(client, mname, myrdataset);
2378 dns_message_takebuffer(client->message, &buffer);
2382 isc_buffer_free(&buffer);
2384 if (myrdata != NULL)
2385 dns_message_puttemprdata(client->message, &myrdata);
2387 if (myrdataset != NULL)
2388 dns_message_puttemprdataset(client->message, &myrdataset);
2390 if (myrdatalist != NULL) {
2391 for (myrdata = ISC_LIST_HEAD(myrdatalist->rdata);
2393 myrdata = ISC_LIST_HEAD(myrdatalist->rdata))
2395 ISC_LIST_UNLINK(myrdatalist->rdata, myrdata, link);
2396 dns_message_puttemprdata(client->message, &myrdata);
2398 dns_message_puttemprdatalist(client->message, &myrdatalist);
2401 query_releasename(client, &name);
2403 CTRACE("query_filter64: done");
2407 query_addrrset(ns_client_t *client, dns_name_t **namep,
2408 dns_rdataset_t **rdatasetp, dns_rdataset_t **sigrdatasetp,
2409 isc_buffer_t *dbuf, dns_section_t section)
2411 dns_name_t *name, *mname;
2412 dns_rdataset_t *rdataset, *mrdataset, *sigrdataset;
2413 isc_result_t result;
2416 * To the current response for 'client', add the answer RRset
2417 * '*rdatasetp' and an optional signature set '*sigrdatasetp', with
2418 * owner name '*namep', to section 'section', unless they are
2419 * already there. Also add any pertinent additional data.
2421 * If 'dbuf' is not NULL, then '*namep' is the name whose data is
2422 * stored in 'dbuf'. In this case, query_addrrset() guarantees that
2423 * when it returns the name will either have been kept or released.
2425 CTRACE("query_addrrset");
2427 rdataset = *rdatasetp;
2428 if (sigrdatasetp != NULL)
2429 sigrdataset = *sigrdatasetp;
2434 result = dns_message_findname(client->message, section,
2435 name, rdataset->type, rdataset->covers,
2436 &mname, &mrdataset);
2437 if (result == ISC_R_SUCCESS) {
2439 * We've already got an RRset of the given name and type.
2440 * There's nothing else to do;
2442 CTRACE("query_addrrset: dns_message_findname succeeded: done");
2444 query_releasename(client, namep);
2446 } else if (result == DNS_R_NXDOMAIN) {
2448 * The name doesn't exist.
2451 query_keepname(client, name, dbuf);
2452 dns_message_addname(client->message, name, section);
2456 RUNTIME_CHECK(result == DNS_R_NXRRSET);
2458 query_releasename(client, namep);
2461 if (rdataset->trust != dns_trust_secure &&
2462 (section == DNS_SECTION_ANSWER ||
2463 section == DNS_SECTION_AUTHORITY))
2464 client->query.attributes &= ~NS_QUERYATTR_SECURE;
2466 * Note: we only add SIGs if we've added the type they cover, so
2467 * we do not need to check if the SIG rdataset is already in the
2470 query_addrdataset(client, mname, rdataset);
2472 if (sigrdataset != NULL && dns_rdataset_isassociated(sigrdataset)) {
2474 * We have a signature. Add it to the response.
2476 ISC_LIST_APPEND(mname->list, sigrdataset, link);
2477 *sigrdatasetp = NULL;
2479 CTRACE("query_addrrset: done");
2482 static inline isc_result_t
2483 query_addsoa(ns_client_t *client, dns_db_t *db, dns_dbversion_t *version,
2484 unsigned int override_ttl, isc_boolean_t isassociated)
2488 isc_result_t result, eresult;
2489 dns_rdataset_t *rdataset = NULL, *sigrdataset = NULL;
2490 dns_rdataset_t **sigrdatasetp = NULL;
2492 CTRACE("query_addsoa");
2496 eresult = ISC_R_SUCCESS;
2502 * Don't add the SOA record for test which set "-T nosoa".
2504 if (ns_g_nosoa && (!WANTDNSSEC(client) || !isassociated))
2505 return (ISC_R_SUCCESS);
2508 * Get resources and make 'name' be the database origin.
2510 result = dns_message_gettempname(client->message, &name);
2511 if (result != ISC_R_SUCCESS)
2513 dns_name_init(name, NULL);
2514 dns_name_clone(dns_db_origin(db), name);
2515 rdataset = query_newrdataset(client);
2516 if (rdataset == NULL) {
2517 eresult = DNS_R_SERVFAIL;
2520 if (WANTDNSSEC(client) && dns_db_issecure(db)) {
2521 sigrdataset = query_newrdataset(client);
2522 if (sigrdataset == NULL) {
2523 eresult = DNS_R_SERVFAIL;
2531 result = dns_db_getoriginnode(db, &node);
2532 if (result == ISC_R_SUCCESS) {
2533 result = dns_db_findrdataset(db, node, version,
2535 0, client->now, rdataset,
2538 dns_fixedname_t foundname;
2541 dns_fixedname_init(&foundname);
2542 fname = dns_fixedname_name(&foundname);
2544 result = dns_db_find(db, name, version, dns_rdatatype_soa,
2545 client->query.dboptions, 0, &node,
2546 fname, rdataset, sigrdataset);
2548 if (result != ISC_R_SUCCESS) {
2550 * This is bad. We tried to get the SOA RR at the zone top
2551 * and it didn't work!
2553 eresult = DNS_R_SERVFAIL;
2556 * Extract the SOA MINIMUM.
2558 dns_rdata_soa_t soa;
2559 dns_rdata_t rdata = DNS_RDATA_INIT;
2560 result = dns_rdataset_first(rdataset);
2561 RUNTIME_CHECK(result == ISC_R_SUCCESS);
2562 dns_rdataset_current(rdataset, &rdata);
2563 result = dns_rdata_tostruct(&rdata, &soa, NULL);
2564 if (result != ISC_R_SUCCESS)
2567 if (override_ttl != ISC_UINT32_MAX &&
2568 override_ttl < rdataset->ttl) {
2569 rdataset->ttl = override_ttl;
2570 if (sigrdataset != NULL)
2571 sigrdataset->ttl = override_ttl;
2575 * Add the SOA and its SIG to the response, with the
2576 * TTLs adjusted per RFC2308 section 3.
2578 if (rdataset->ttl > soa.minimum)
2579 rdataset->ttl = soa.minimum;
2580 if (sigrdataset != NULL && sigrdataset->ttl > soa.minimum)
2581 sigrdataset->ttl = soa.minimum;
2583 if (sigrdataset != NULL)
2584 sigrdatasetp = &sigrdataset;
2586 sigrdatasetp = NULL;
2587 query_addrrset(client, &name, &rdataset, sigrdatasetp, NULL,
2588 DNS_SECTION_AUTHORITY);
2592 query_putrdataset(client, &rdataset);
2593 if (sigrdataset != NULL)
2594 query_putrdataset(client, &sigrdataset);
2596 query_releasename(client, &name);
2598 dns_db_detachnode(db, &node);
2603 static inline isc_result_t
2604 query_addns(ns_client_t *client, dns_db_t *db, dns_dbversion_t *version) {
2605 dns_name_t *name, *fname;
2607 isc_result_t result, eresult;
2608 dns_fixedname_t foundname;
2609 dns_rdataset_t *rdataset = NULL, *sigrdataset = NULL;
2610 dns_rdataset_t **sigrdatasetp = NULL;
2612 CTRACE("query_addns");
2616 eresult = ISC_R_SUCCESS;
2620 dns_fixedname_init(&foundname);
2621 fname = dns_fixedname_name(&foundname);
2624 * Get resources and make 'name' be the database origin.
2626 result = dns_message_gettempname(client->message, &name);
2627 if (result != ISC_R_SUCCESS) {
2628 CTRACE("query_addns: dns_message_gettempname failed: done");
2631 dns_name_init(name, NULL);
2632 dns_name_clone(dns_db_origin(db), name);
2633 rdataset = query_newrdataset(client);
2634 if (rdataset == NULL) {
2635 CTRACE("query_addns: query_newrdataset failed");
2636 eresult = DNS_R_SERVFAIL;
2639 if (WANTDNSSEC(client) && dns_db_issecure(db)) {
2640 sigrdataset = query_newrdataset(client);
2641 if (sigrdataset == NULL) {
2642 CTRACE("query_addns: query_newrdataset failed");
2643 eresult = DNS_R_SERVFAIL;
2649 * Find the NS rdataset.
2651 result = dns_db_getoriginnode(db, &node);
2652 if (result == ISC_R_SUCCESS) {
2653 result = dns_db_findrdataset(db, node, version,
2655 0, client->now, rdataset,
2658 CTRACE("query_addns: calling dns_db_find");
2659 result = dns_db_find(db, name, NULL, dns_rdatatype_ns,
2660 client->query.dboptions, 0, &node,
2661 fname, rdataset, sigrdataset);
2662 CTRACE("query_addns: dns_db_find complete");
2664 if (result != ISC_R_SUCCESS) {
2665 CTRACE("query_addns: "
2666 "dns_db_findrdataset or dns_db_find failed");
2668 * This is bad. We tried to get the NS rdataset at the zone
2669 * top and it didn't work!
2671 eresult = DNS_R_SERVFAIL;
2673 if (sigrdataset != NULL)
2674 sigrdatasetp = &sigrdataset;
2676 sigrdatasetp = NULL;
2677 query_addrrset(client, &name, &rdataset, sigrdatasetp, NULL,
2678 DNS_SECTION_AUTHORITY);
2682 CTRACE("query_addns: cleanup");
2683 query_putrdataset(client, &rdataset);
2684 if (sigrdataset != NULL)
2685 query_putrdataset(client, &sigrdataset);
2687 query_releasename(client, &name);
2689 dns_db_detachnode(db, &node);
2691 CTRACE("query_addns: done");
2696 query_add_cname(ns_client_t *client, dns_name_t *qname, dns_name_t *tname,
2697 dns_trust_t trust, dns_ttl_t ttl)
2699 dns_rdataset_t *rdataset;
2700 dns_rdatalist_t *rdatalist;
2704 isc_result_t result;
2707 * We assume the name data referred to by tname won't go away.
2711 result = dns_message_gettempname(client->message, &aname);
2712 if (result != ISC_R_SUCCESS)
2714 result = dns_name_dup(qname, client->mctx, aname);
2715 if (result != ISC_R_SUCCESS) {
2716 dns_message_puttempname(client->message, &aname);
2721 result = dns_message_gettemprdatalist(client->message, &rdatalist);
2722 if (result != ISC_R_SUCCESS) {
2723 dns_message_puttempname(client->message, &aname);
2727 result = dns_message_gettemprdata(client->message, &rdata);
2728 if (result != ISC_R_SUCCESS) {
2729 dns_message_puttempname(client->message, &aname);
2730 dns_message_puttemprdatalist(client->message, &rdatalist);
2734 result = dns_message_gettemprdataset(client->message, &rdataset);
2735 if (result != ISC_R_SUCCESS) {
2736 dns_message_puttempname(client->message, &aname);
2737 dns_message_puttemprdatalist(client->message, &rdatalist);
2738 dns_message_puttemprdata(client->message, &rdata);
2741 dns_rdataset_init(rdataset);
2742 rdatalist->type = dns_rdatatype_cname;
2743 rdatalist->covers = 0;
2744 rdatalist->rdclass = client->message->rdclass;
2745 rdatalist->ttl = ttl;
2747 dns_name_toregion(tname, &r);
2748 rdata->data = r.base;
2749 rdata->length = r.length;
2750 rdata->rdclass = client->message->rdclass;
2751 rdata->type = dns_rdatatype_cname;
2753 ISC_LIST_INIT(rdatalist->rdata);
2754 ISC_LIST_APPEND(rdatalist->rdata, rdata, link);
2755 RUNTIME_CHECK(dns_rdatalist_tordataset(rdatalist, rdataset)
2757 rdataset->trust = trust;
2759 query_addrrset(client, &aname, &rdataset, NULL, NULL,
2760 DNS_SECTION_ANSWER);
2761 if (rdataset != NULL) {
2762 if (dns_rdataset_isassociated(rdataset))
2763 dns_rdataset_disassociate(rdataset);
2764 dns_message_puttemprdataset(client->message, &rdataset);
2767 dns_message_puttempname(client->message, &aname);
2769 return (ISC_R_SUCCESS);
2773 * Mark the RRsets as secure. Update the cache (db) to reflect the
2774 * change in trust level.
2777 mark_secure(ns_client_t *client, dns_db_t *db, dns_name_t *name,
2778 isc_uint32_t ttl, dns_rdataset_t *rdataset,
2779 dns_rdataset_t *sigrdataset)
2781 isc_result_t result;
2782 dns_dbnode_t *node = NULL;
2784 rdataset->trust = dns_trust_secure;
2785 sigrdataset->trust = dns_trust_secure;
2788 * Save the updated secure state. Ignore failures.
2790 result = dns_db_findnode(db, name, ISC_TRUE, &node);
2791 if (result != ISC_R_SUCCESS)
2794 * Bound the validated ttls then minimise.
2796 if (sigrdataset->ttl > ttl)
2797 sigrdataset->ttl = ttl;
2798 if (rdataset->ttl > ttl)
2799 rdataset->ttl = ttl;
2800 if (rdataset->ttl > sigrdataset->ttl)
2801 rdataset->ttl = sigrdataset->ttl;
2803 sigrdataset->ttl = rdataset->ttl;
2805 (void)dns_db_addrdataset(db, node, NULL, client->now, rdataset,
2807 (void)dns_db_addrdataset(db, node, NULL, client->now, sigrdataset,
2809 dns_db_detachnode(db, &node);
2813 * Find the secure key that corresponds to rrsig.
2814 * Note: 'keyrdataset' maintains state between successive calls,
2815 * there may be multiple keys with the same keyid.
2816 * Return ISC_FALSE if we have exhausted all the possible keys.
2818 static isc_boolean_t
2819 get_key(ns_client_t *client, dns_db_t *db, dns_rdata_rrsig_t *rrsig,
2820 dns_rdataset_t *keyrdataset, dst_key_t **keyp)
2822 isc_result_t result;
2823 dns_dbnode_t *node = NULL;
2824 isc_boolean_t secure = ISC_FALSE;
2826 if (!dns_rdataset_isassociated(keyrdataset)) {
2827 result = dns_db_findnode(db, &rrsig->signer, ISC_FALSE, &node);
2828 if (result != ISC_R_SUCCESS)
2831 result = dns_db_findrdataset(db, node, NULL,
2832 dns_rdatatype_dnskey, 0,
2833 client->now, keyrdataset, NULL);
2834 dns_db_detachnode(db, &node);
2835 if (result != ISC_R_SUCCESS)
2838 if (keyrdataset->trust != dns_trust_secure)
2841 result = dns_rdataset_first(keyrdataset);
2843 result = dns_rdataset_next(keyrdataset);
2845 for ( ; result == ISC_R_SUCCESS;
2846 result = dns_rdataset_next(keyrdataset)) {
2847 dns_rdata_t rdata = DNS_RDATA_INIT;
2850 dns_rdataset_current(keyrdataset, &rdata);
2851 isc_buffer_init(&b, rdata.data, rdata.length);
2852 isc_buffer_add(&b, rdata.length);
2853 result = dst_key_fromdns(&rrsig->signer, rdata.rdclass, &b,
2854 client->mctx, keyp);
2855 if (result != ISC_R_SUCCESS)
2857 if (rrsig->algorithm == (dns_secalg_t)dst_key_alg(*keyp) &&
2858 rrsig->keyid == (dns_keytag_t)dst_key_id(*keyp) &&
2859 dst_key_iszonekey(*keyp)) {
2868 static isc_boolean_t
2869 verify(dst_key_t *key, dns_name_t *name, dns_rdataset_t *rdataset,
2870 dns_rdata_t *rdata, isc_mem_t *mctx, isc_boolean_t acceptexpired)
2872 isc_result_t result;
2873 dns_fixedname_t fixed;
2874 isc_boolean_t ignore = ISC_FALSE;
2876 dns_fixedname_init(&fixed);
2879 result = dns_dnssec_verify2(name, rdataset, key, ignore, mctx,
2881 if (result == DNS_R_SIGEXPIRED && acceptexpired) {
2885 if (result == ISC_R_SUCCESS || result == DNS_R_FROMWILDCARD)
2891 * Validate the rdataset if possible with available records.
2893 static isc_boolean_t
2894 validate(ns_client_t *client, dns_db_t *db, dns_name_t *name,
2895 dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset)
2897 isc_result_t result;
2898 dns_rdata_t rdata = DNS_RDATA_INIT;
2899 dns_rdata_rrsig_t rrsig;
2900 dst_key_t *key = NULL;
2901 dns_rdataset_t keyrdataset;
2903 if (sigrdataset == NULL || !dns_rdataset_isassociated(sigrdataset))
2906 for (result = dns_rdataset_first(sigrdataset);
2907 result == ISC_R_SUCCESS;
2908 result = dns_rdataset_next(sigrdataset)) {
2910 dns_rdata_reset(&rdata);
2911 dns_rdataset_current(sigrdataset, &rdata);
2912 result = dns_rdata_tostruct(&rdata, &rrsig, NULL);
2913 if (result != ISC_R_SUCCESS)
2915 if (!dns_resolver_algorithm_supported(client->view->resolver,
2916 name, rrsig.algorithm))
2918 if (!dns_name_issubdomain(name, &rrsig.signer))
2920 dns_rdataset_init(&keyrdataset);
2922 if (!get_key(client, db, &rrsig, &keyrdataset, &key))
2924 if (verify(key, name, rdataset, &rdata, client->mctx,
2925 client->view->acceptexpired)) {
2927 dns_rdataset_disassociate(&keyrdataset);
2928 mark_secure(client, db, name,
2930 rdataset, sigrdataset);
2935 if (dns_rdataset_isassociated(&keyrdataset))
2936 dns_rdataset_disassociate(&keyrdataset);
2942 query_addbestns(ns_client_t *client) {
2945 dns_name_t *fname, *zfname;
2946 dns_rdataset_t *rdataset, *sigrdataset, *zrdataset, *zsigrdataset;
2947 isc_boolean_t is_zone, use_zone;
2949 isc_result_t result;
2950 dns_dbversion_t *version;
2954 CTRACE("query_addbestns");
2960 zsigrdataset = NULL;
2966 is_zone = ISC_FALSE;
2967 use_zone = ISC_FALSE;
2970 * Find the right database.
2972 result = query_getdb(client, client->query.qname, dns_rdatatype_ns, 0,
2973 &zone, &db, &version, &is_zone);
2974 if (result != ISC_R_SUCCESS)
2979 * We'll need some resources...
2981 dbuf = query_getnamebuf(client);
2984 fname = query_newname(client, dbuf, &b);
2985 rdataset = query_newrdataset(client);
2986 if (fname == NULL || rdataset == NULL)
2989 * Get the RRSIGs if the client requested them or if we may
2990 * need to validate answers from the cache.
2992 if (WANTDNSSEC(client) || !is_zone) {
2993 sigrdataset = query_newrdataset(client);
2994 if (sigrdataset == NULL)
2999 * Now look for the zonecut.
3002 result = dns_db_find(db, client->query.qname, version,
3003 dns_rdatatype_ns, client->query.dboptions,
3004 client->now, &node, fname,
3005 rdataset, sigrdataset);
3006 if (result != DNS_R_DELEGATION)
3008 if (USECACHE(client)) {
3009 query_keepname(client, fname, dbuf);
3013 zrdataset = rdataset;
3015 zsigrdataset = sigrdataset;
3017 dns_db_detachnode(db, &node);
3020 dns_db_attach(client->view->cachedb, &db);
3021 is_zone = ISC_FALSE;
3025 result = dns_db_findzonecut(db, client->query.qname,
3026 client->query.dboptions,
3027 client->now, &node, fname,
3028 rdataset, sigrdataset);
3029 if (result == ISC_R_SUCCESS) {
3030 if (zfname != NULL &&
3031 !dns_name_issubdomain(fname, zfname)) {
3033 * We found a zonecut in the cache, but our
3034 * zone delegation is better.
3036 use_zone = ISC_TRUE;
3038 } else if (result == ISC_R_NOTFOUND && zfname != NULL) {
3040 * We didn't find anything in the cache, but we
3041 * have a zone delegation, so use it.
3043 use_zone = ISC_TRUE;
3049 query_releasename(client, &fname);
3053 * We've already done query_keepname() on
3054 * zfname, so we must set dbuf to NULL to
3055 * prevent query_addrrset() from trying to
3056 * call query_keepname() again.
3059 query_putrdataset(client, &rdataset);
3060 if (sigrdataset != NULL)
3061 query_putrdataset(client, &sigrdataset);
3062 rdataset = zrdataset;
3064 sigrdataset = zsigrdataset;
3065 zsigrdataset = NULL;
3069 * Attempt to validate RRsets that are pending or that are glue.
3071 if ((DNS_TRUST_PENDING(rdataset->trust) ||
3072 (sigrdataset != NULL && DNS_TRUST_PENDING(sigrdataset->trust)))
3073 && !validate(client, db, fname, rdataset, sigrdataset) &&
3074 !PENDINGOK(client->query.dboptions))
3077 if ((DNS_TRUST_GLUE(rdataset->trust) ||
3078 (sigrdataset != NULL && DNS_TRUST_GLUE(sigrdataset->trust))) &&
3079 !validate(client, db, fname, rdataset, sigrdataset) &&
3080 SECURE(client) && WANTDNSSEC(client))
3084 * If the client doesn't want DNSSEC we can discard the sigrdataset
3087 if (!WANTDNSSEC(client))
3088 query_putrdataset(client, &sigrdataset);
3089 query_addrrset(client, &fname, &rdataset, &sigrdataset, dbuf,
3090 DNS_SECTION_AUTHORITY);
3093 if (rdataset != NULL)
3094 query_putrdataset(client, &rdataset);
3095 if (sigrdataset != NULL)
3096 query_putrdataset(client, &sigrdataset);
3098 query_releasename(client, &fname);
3100 dns_db_detachnode(db, &node);
3104 dns_zone_detach(&zone);
3106 query_putrdataset(client, &zrdataset);
3107 if (zsigrdataset != NULL)
3108 query_putrdataset(client, &zsigrdataset);
3110 query_releasename(client, &zfname);
3111 dns_db_detach(&zdb);
3116 fixrdataset(ns_client_t *client, dns_rdataset_t **rdataset) {
3117 if (*rdataset == NULL)
3118 *rdataset = query_newrdataset(client);
3119 else if (dns_rdataset_isassociated(*rdataset))
3120 dns_rdataset_disassociate(*rdataset);
3124 fixfname(ns_client_t *client, dns_name_t **fname, isc_buffer_t **dbuf,
3127 if (*fname == NULL) {
3128 *dbuf = query_getnamebuf(client);
3131 *fname = query_newname(client, *dbuf, nbuf);
3136 query_addds(ns_client_t *client, dns_db_t *db, dns_dbnode_t *node,
3137 dns_dbversion_t *version, dns_name_t *name)
3139 dns_fixedname_t fixed;
3140 dns_name_t *fname = NULL;
3142 dns_rdataset_t *rdataset, *sigrdataset;
3143 isc_buffer_t *dbuf, b;
3144 isc_result_t result;
3147 CTRACE("query_addds");
3153 * We'll need some resources...
3155 rdataset = query_newrdataset(client);
3156 sigrdataset = query_newrdataset(client);
3157 if (rdataset == NULL || sigrdataset == NULL)
3161 * Look for the DS record, which may or may not be present.
3163 result = dns_db_findrdataset(db, node, version, dns_rdatatype_ds, 0,
3164 client->now, rdataset, sigrdataset);
3166 * If we didn't find it, look for an NSEC.
3168 if (result == ISC_R_NOTFOUND)
3169 result = dns_db_findrdataset(db, node, version,
3170 dns_rdatatype_nsec, 0, client->now,
3171 rdataset, sigrdataset);
3172 if (result != ISC_R_SUCCESS && result != ISC_R_NOTFOUND)
3174 if (!dns_rdataset_isassociated(rdataset) ||
3175 !dns_rdataset_isassociated(sigrdataset))
3179 * We've already added the NS record, so if the name's not there,
3180 * we have other problems. Use this name rather than calling
3183 result = dns_message_firstname(client->message, DNS_SECTION_AUTHORITY);
3184 if (result != ISC_R_SUCCESS)
3188 dns_message_currentname(client->message, DNS_SECTION_AUTHORITY,
3190 result = dns_message_findtype(rname, dns_rdatatype_ns, 0, NULL);
3191 if (result != ISC_R_SUCCESS)
3194 ISC_LIST_APPEND(rname->list, rdataset, link);
3195 ISC_LIST_APPEND(rname->list, sigrdataset, link);
3201 if (!dns_db_iszone(db))
3204 * Add the NSEC3 which proves the DS does not exist.
3206 dbuf = query_getnamebuf(client);
3209 fname = query_newname(client, dbuf, &b);
3210 dns_fixedname_init(&fixed);
3211 if (dns_rdataset_isassociated(rdataset))
3212 dns_rdataset_disassociate(rdataset);
3213 if (dns_rdataset_isassociated(sigrdataset))
3214 dns_rdataset_disassociate(sigrdataset);
3215 query_findclosestnsec3(name, db, version, client, rdataset,
3216 sigrdataset, fname, ISC_TRUE,
3217 dns_fixedname_name(&fixed));
3218 if (!dns_rdataset_isassociated(rdataset))
3220 query_addrrset(client, &fname, &rdataset, &sigrdataset, dbuf,
3221 DNS_SECTION_AUTHORITY);
3223 * Did we find the closest provable encloser instead?
3224 * If so add the nearest to the closest provable encloser.
3226 if (!dns_name_equal(name, dns_fixedname_name(&fixed))) {
3227 count = dns_name_countlabels(dns_fixedname_name(&fixed)) + 1;
3228 dns_name_getlabelsequence(name,
3229 dns_name_countlabels(name) - count,
3230 count, dns_fixedname_name(&fixed));
3231 fixfname(client, &fname, &dbuf, &b);
3232 fixrdataset(client, &rdataset);
3233 fixrdataset(client, &sigrdataset);
3234 if (fname == NULL || rdataset == NULL || sigrdataset == NULL)
3236 query_findclosestnsec3(dns_fixedname_name(&fixed), db, version,
3237 client, rdataset, sigrdataset, fname,
3239 if (!dns_rdataset_isassociated(rdataset))
3241 query_addrrset(client, &fname, &rdataset, &sigrdataset, dbuf,
3242 DNS_SECTION_AUTHORITY);
3246 if (rdataset != NULL)
3247 query_putrdataset(client, &rdataset);
3248 if (sigrdataset != NULL)
3249 query_putrdataset(client, &sigrdataset);
3251 query_releasename(client, &fname);
3255 query_addwildcardproof(ns_client_t *client, dns_db_t *db,
3256 dns_dbversion_t *version, dns_name_t *name,
3257 isc_boolean_t ispositive, isc_boolean_t nodata)
3259 isc_buffer_t *dbuf, b;
3261 dns_rdataset_t *rdataset, *sigrdataset;
3262 dns_fixedname_t wfixed;
3265 unsigned int options;
3266 unsigned int olabels, nlabels, labels;
3267 isc_result_t result;
3268 dns_rdata_t rdata = DNS_RDATA_INIT;
3269 dns_rdata_nsec_t nsec;
3270 isc_boolean_t have_wname;
3272 dns_fixedname_t cfixed;
3275 CTRACE("query_addwildcardproof");
3282 * Get the NOQNAME proof then if !ispositive
3283 * get the NOWILDCARD proof.
3285 * DNS_DBFIND_NOWILD finds the NSEC records that covers the
3286 * name ignoring any wildcard. From the owner and next names
3287 * of this record you can compute which wildcard (if it exists)
3288 * will match by finding the longest common suffix of the
3289 * owner name and next names with the qname and prefixing that
3290 * with the wildcard label.
3295 * example NSEC b.example
3297 * b.example NSEC a.d.example
3299 * a.d.example NSEC g.f.example
3301 * g.f.example NSEC z.i.example
3303 * z.i.example NSEC example
3306 * a.example -> example NSEC b.example
3307 * owner common example
3308 * next common example
3310 * d.b.example -> b.example NSEC a.d.example
3311 * owner common b.example
3312 * next common example
3314 * a.f.example -> a.d.example NSEC g.f.example
3315 * owner common example
3316 * next common f.example
3318 * j.example -> z.i.example NSEC example
3319 * owner common example
3320 * next common example
3323 options = client->query.dboptions | DNS_DBFIND_NOWILD;
3324 dns_fixedname_init(&wfixed);
3325 wname = dns_fixedname_name(&wfixed);
3327 have_wname = ISC_FALSE;
3329 * We'll need some resources...
3331 dbuf = query_getnamebuf(client);
3334 fname = query_newname(client, dbuf, &b);
3335 rdataset = query_newrdataset(client);
3336 sigrdataset = query_newrdataset(client);
3337 if (fname == NULL || rdataset == NULL || sigrdataset == NULL)
3340 result = dns_db_find(db, name, version, dns_rdatatype_nsec, options,
3341 0, &node, fname, rdataset, sigrdataset);
3343 dns_db_detachnode(db, &node);
3345 if (!dns_rdataset_isassociated(rdataset)) {
3347 * No NSEC proof available, return NSEC3 proofs instead.
3349 dns_fixedname_init(&cfixed);
3350 cname = dns_fixedname_name(&cfixed);
3352 * Find the closest encloser.
3354 dns_name_copy(name, cname, NULL);
3355 while (result == DNS_R_NXDOMAIN) {
3356 labels = dns_name_countlabels(cname) - 1;
3362 dns_name_split(cname, labels, NULL, cname);
3363 result = dns_db_find(db, cname, version,
3365 options, 0, NULL, fname,
3369 * Add closest (provable) encloser NSEC3.
3371 query_findclosestnsec3(cname, db, NULL, client, rdataset,
3372 sigrdataset, fname, ISC_TRUE, cname);
3373 if (!dns_rdataset_isassociated(rdataset))
3376 query_addrrset(client, &fname, &rdataset, &sigrdataset,
3377 dbuf, DNS_SECTION_AUTHORITY);
3380 * Replace resources which were consumed by query_addrrset.
3382 if (fname == NULL) {
3383 dbuf = query_getnamebuf(client);
3386 fname = query_newname(client, dbuf, &b);
3389 if (rdataset == NULL)
3390 rdataset = query_newrdataset(client);
3391 else if (dns_rdataset_isassociated(rdataset))
3392 dns_rdataset_disassociate(rdataset);
3394 if (sigrdataset == NULL)
3395 sigrdataset = query_newrdataset(client);
3396 else if (dns_rdataset_isassociated(sigrdataset))
3397 dns_rdataset_disassociate(sigrdataset);
3399 if (fname == NULL || rdataset == NULL || sigrdataset == NULL)
3402 * Add no qname proof.
3404 labels = dns_name_countlabels(cname) + 1;
3405 if (dns_name_countlabels(name) == labels)
3406 dns_name_copy(name, wname, NULL);
3408 dns_name_split(name, labels, NULL, wname);
3410 query_findclosestnsec3(wname, db, NULL, client, rdataset,
3411 sigrdataset, fname, ISC_FALSE, NULL);
3412 if (!dns_rdataset_isassociated(rdataset))
3414 query_addrrset(client, &fname, &rdataset, &sigrdataset,
3415 dbuf, DNS_SECTION_AUTHORITY);
3421 * Replace resources which were consumed by query_addrrset.
3423 if (fname == NULL) {
3424 dbuf = query_getnamebuf(client);
3427 fname = query_newname(client, dbuf, &b);
3430 if (rdataset == NULL)
3431 rdataset = query_newrdataset(client);
3432 else if (dns_rdataset_isassociated(rdataset))
3433 dns_rdataset_disassociate(rdataset);
3435 if (sigrdataset == NULL)
3436 sigrdataset = query_newrdataset(client);
3437 else if (dns_rdataset_isassociated(sigrdataset))
3438 dns_rdataset_disassociate(sigrdataset);
3440 if (fname == NULL || rdataset == NULL || sigrdataset == NULL)
3443 * Add the no wildcard proof.
3445 result = dns_name_concatenate(dns_wildcardname,
3446 cname, wname, NULL);
3447 if (result != ISC_R_SUCCESS)
3450 query_findclosestnsec3(wname, db, NULL, client, rdataset,
3451 sigrdataset, fname, nodata, NULL);
3452 if (!dns_rdataset_isassociated(rdataset))
3454 query_addrrset(client, &fname, &rdataset, &sigrdataset,
3455 dbuf, DNS_SECTION_AUTHORITY);
3458 } else if (result == DNS_R_NXDOMAIN) {
3460 result = dns_rdataset_first(rdataset);
3461 if (result == ISC_R_SUCCESS) {
3462 dns_rdataset_current(rdataset, &rdata);
3463 result = dns_rdata_tostruct(&rdata, &nsec, NULL);
3465 if (result == ISC_R_SUCCESS) {
3466 (void)dns_name_fullcompare(name, fname, &order,
3468 (void)dns_name_fullcompare(name, &nsec.next, &order,
3471 * Check for a pathological condition created when
3472 * serving some malformed signed zones and bail out.
3474 if (dns_name_countlabels(name) == nlabels)
3477 if (olabels > nlabels)
3478 dns_name_split(name, olabels, NULL, wname);
3480 dns_name_split(name, nlabels, NULL, wname);
3481 result = dns_name_concatenate(dns_wildcardname,
3482 wname, wname, NULL);
3483 if (result == ISC_R_SUCCESS)
3484 have_wname = ISC_TRUE;
3485 dns_rdata_freestruct(&nsec);
3487 query_addrrset(client, &fname, &rdataset, &sigrdataset,
3488 dbuf, DNS_SECTION_AUTHORITY);
3490 if (rdataset != NULL)
3491 query_putrdataset(client, &rdataset);
3492 if (sigrdataset != NULL)
3493 query_putrdataset(client, &sigrdataset);
3495 query_releasename(client, &fname);
3497 ispositive = ISC_TRUE; /* prevent loop */
3498 if (!dns_name_equal(name, wname)) {
3504 if (rdataset != NULL)
3505 query_putrdataset(client, &rdataset);
3506 if (sigrdataset != NULL)
3507 query_putrdataset(client, &sigrdataset);
3509 query_releasename(client, &fname);
3513 query_addnxrrsetnsec(ns_client_t *client, dns_db_t *db,
3514 dns_dbversion_t *version, dns_name_t **namep,
3515 dns_rdataset_t **rdatasetp, dns_rdataset_t **sigrdatasetp)
3518 dns_rdataset_t *sigrdataset;
3519 dns_rdata_t sigrdata;
3520 dns_rdata_rrsig_t sig;
3521 unsigned int labels;
3522 isc_buffer_t *dbuf, b;
3524 isc_result_t result;
3527 if ((name->attributes & DNS_NAMEATTR_WILDCARD) == 0) {
3528 query_addrrset(client, namep, rdatasetp, sigrdatasetp,
3529 NULL, DNS_SECTION_AUTHORITY);
3533 if (sigrdatasetp == NULL)
3536 sigrdataset = *sigrdatasetp;
3537 if (sigrdataset == NULL || !dns_rdataset_isassociated(sigrdataset))
3539 result = dns_rdataset_first(sigrdataset);
3540 if (result != ISC_R_SUCCESS)
3542 dns_rdata_init(&sigrdata);
3543 dns_rdataset_current(sigrdataset, &sigrdata);
3544 result = dns_rdata_tostruct(&sigrdata, &sig, NULL);
3545 if (result != ISC_R_SUCCESS)
3548 labels = dns_name_countlabels(name);
3549 if ((unsigned int)sig.labels + 1 >= labels)
3553 query_addwildcardproof(client, db, version, client->query.qname,
3554 ISC_TRUE, ISC_FALSE);
3557 * We'll need some resources...
3559 dbuf = query_getnamebuf(client);
3562 fname = query_newname(client, dbuf, &b);
3565 dns_name_split(name, sig.labels + 1, NULL, fname);
3566 /* This will succeed, since we've stripped labels. */
3567 RUNTIME_CHECK(dns_name_concatenate(dns_wildcardname, fname, fname,
3568 NULL) == ISC_R_SUCCESS);
3569 query_addrrset(client, &fname, rdatasetp, sigrdatasetp,
3570 dbuf, DNS_SECTION_AUTHORITY);
3574 query_resume(isc_task_t *task, isc_event_t *event) {
3575 dns_fetchevent_t *devent = (dns_fetchevent_t *)event;
3577 ns_client_t *client;
3578 isc_boolean_t fetch_canceled, client_shuttingdown;
3579 isc_result_t result;
3580 isc_logcategory_t *logcategory = NS_LOGCATEGORY_QUERY_EERRORS;
3584 * Resume a query after recursion.
3589 REQUIRE(event->ev_type == DNS_EVENT_FETCHDONE);
3590 client = devent->ev_arg;
3591 REQUIRE(NS_CLIENT_VALID(client));
3592 REQUIRE(task == client->task);
3593 REQUIRE(RECURSING(client));
3595 LOCK(&client->query.fetchlock);
3596 if (client->query.fetch != NULL) {
3598 * This is the fetch we've been waiting for.
3600 INSIST(devent->fetch == client->query.fetch);
3601 client->query.fetch = NULL;
3602 fetch_canceled = ISC_FALSE;
3604 * Update client->now.
3606 isc_stdtime_get(&client->now);
3609 * This is a fetch completion event for a canceled fetch.
3610 * Clean up and don't resume the find.
3612 fetch_canceled = ISC_TRUE;
3614 UNLOCK(&client->query.fetchlock);
3615 INSIST(client->query.fetch == NULL);
3617 client->query.attributes &= ~NS_QUERYATTR_RECURSING;
3618 fetch = devent->fetch;
3619 devent->fetch = NULL;
3622 * If this client is shutting down, or this transaction
3623 * has timed out, do not resume the find.
3625 client_shuttingdown = ns_client_shuttingdown(client);
3626 if (fetch_canceled || client_shuttingdown) {
3627 if (devent->node != NULL)
3628 dns_db_detachnode(devent->db, &devent->node);
3629 if (devent->db != NULL)
3630 dns_db_detach(&devent->db);
3631 query_putrdataset(client, &devent->rdataset);
3632 if (devent->sigrdataset != NULL)
3633 query_putrdataset(client, &devent->sigrdataset);
3634 isc_event_free(&event);
3636 query_error(client, DNS_R_SERVFAIL, __LINE__);
3638 query_next(client, ISC_R_CANCELED);
3640 * This may destroy the client.
3642 ns_client_detach(&client);
3644 result = query_find(client, devent, 0);
3645 if (result != ISC_R_SUCCESS) {
3646 if (result == DNS_R_SERVFAIL)
3647 errorloglevel = ISC_LOG_DEBUG(2);
3649 errorloglevel = ISC_LOG_DEBUG(4);
3650 if (isc_log_wouldlog(ns_g_lctx, errorloglevel)) {
3651 dns_resolver_logfetch(fetch, ns_g_lctx,
3654 errorloglevel, ISC_FALSE);
3659 dns_resolver_destroyfetch(&fetch);
3663 query_recurse(ns_client_t *client, dns_rdatatype_t qtype, dns_name_t *qname,
3664 dns_name_t *qdomain, dns_rdataset_t *nameservers,
3665 isc_boolean_t resuming)
3667 isc_result_t result;
3668 dns_rdataset_t *rdataset, *sigrdataset;
3669 isc_sockaddr_t *peeraddr;
3672 inc_stats(client, dns_nsstatscounter_recursion);
3675 * We are about to recurse, which means that this client will
3676 * be unavailable for serving new requests for an indeterminate
3677 * amount of time. If this client is currently responsible
3678 * for handling incoming queries, set up a new client
3679 * object to handle them while we are waiting for a
3680 * response. There is no need to replace TCP clients
3681 * because those have already been replaced when the
3682 * connection was accepted (if allowed by the TCP quota).
3684 if (client->recursionquota == NULL) {
3685 result = isc_quota_attach(&ns_g_server->recursionquota,
3686 &client->recursionquota);
3687 if (result == ISC_R_SOFTQUOTA) {
3688 static isc_stdtime_t last = 0;
3690 isc_stdtime_get(&now);
3693 ns_client_log(client, NS_LOGCATEGORY_CLIENT,
3696 "recursive-clients soft limit "
3697 "exceeded (%d/%d/%d), "
3698 "aborting oldest query",
3699 client->recursionquota->used,
3700 client->recursionquota->soft,
3701 client->recursionquota->max);
3703 ns_client_killoldestquery(client);
3704 result = ISC_R_SUCCESS;
3705 } else if (result == ISC_R_QUOTA) {
3706 static isc_stdtime_t last = 0;
3708 isc_stdtime_get(&now);
3711 ns_client_log(client, NS_LOGCATEGORY_CLIENT,
3714 "no more recursive clients "
3716 ns_g_server->recursionquota.used,
3717 ns_g_server->recursionquota.soft,
3718 ns_g_server->recursionquota.max,
3719 isc_result_totext(result));
3721 ns_client_killoldestquery(client);
3723 if (result == ISC_R_SUCCESS && !client->mortal &&
3724 (client->attributes & NS_CLIENTATTR_TCP) == 0) {
3725 result = ns_client_replace(client);
3726 if (result != ISC_R_SUCCESS) {
3727 ns_client_log(client, NS_LOGCATEGORY_CLIENT,
3730 "ns_client_replace() failed: %s",
3731 isc_result_totext(result));
3732 isc_quota_detach(&client->recursionquota);
3735 if (result != ISC_R_SUCCESS)
3737 ns_client_recursing(client);
3741 * Invoke the resolver.
3743 REQUIRE(nameservers == NULL || nameservers->type == dns_rdatatype_ns);
3744 REQUIRE(client->query.fetch == NULL);
3746 rdataset = query_newrdataset(client);
3747 if (rdataset == NULL)
3748 return (ISC_R_NOMEMORY);
3749 if (WANTDNSSEC(client)) {
3750 sigrdataset = query_newrdataset(client);
3751 if (sigrdataset == NULL) {
3752 query_putrdataset(client, &rdataset);
3753 return (ISC_R_NOMEMORY);
3758 if (client->query.timerset == ISC_FALSE)
3759 ns_client_settimeout(client, 60);
3760 if ((client->attributes & NS_CLIENTATTR_TCP) == 0)
3761 peeraddr = &client->peeraddr;
3764 result = dns_resolver_createfetch2(client->view->resolver,
3765 qname, qtype, qdomain, nameservers,
3766 NULL, peeraddr, client->message->id,
3767 client->query.fetchoptions,
3769 query_resume, client,
3770 rdataset, sigrdataset,
3771 &client->query.fetch);
3773 if (result == ISC_R_SUCCESS) {
3775 * Record that we're waiting for an event. A client which
3776 * is shutting down will not be destroyed until all the
3777 * events have been received.
3780 query_putrdataset(client, &rdataset);
3781 if (sigrdataset != NULL)
3782 query_putrdataset(client, &sigrdataset);
3789 rpz_clean(dns_zone_t **zonep, dns_db_t **dbp, dns_dbnode_t **nodep,
3790 dns_rdataset_t **rdatasetp)
3792 if (nodep != NULL && *nodep != NULL) {
3793 REQUIRE(dbp != NULL && *dbp != NULL);
3794 dns_db_detachnode(*dbp, nodep);
3796 if (dbp != NULL && *dbp != NULL)
3798 if (zonep != NULL && *zonep != NULL)
3799 dns_zone_detach(zonep);
3800 if (rdatasetp != NULL && *rdatasetp != NULL &&
3801 dns_rdataset_isassociated(*rdatasetp))
3802 dns_rdataset_disassociate(*rdatasetp);
3805 static inline isc_result_t
3806 rpz_ready(ns_client_t *client, dns_zone_t **zonep, dns_db_t **dbp,
3807 dns_dbnode_t **nodep, dns_rdataset_t **rdatasetp)
3809 REQUIRE(rdatasetp != NULL);
3811 rpz_clean(zonep, dbp, nodep, rdatasetp);
3812 if (*rdatasetp == NULL) {
3813 *rdatasetp = query_newrdataset(client);
3814 if (*rdatasetp == NULL)
3815 return (DNS_R_SERVFAIL);
3817 return (ISC_R_SUCCESS);
3821 rpz_st_clear(ns_client_t *client) {
3822 dns_rpz_st_t *st = client->query.rpz_st;
3824 rpz_clean(&st->m.zone, &st->m.db, &st->m.node, NULL);
3825 st->m.version = NULL;
3826 if (st->m.rdataset != NULL)
3827 query_putrdataset(client, &st->m.rdataset);
3829 rpz_clean(NULL, &st->r.db, NULL, NULL);
3830 if (st->r.ns_rdataset != NULL)
3831 query_putrdataset(client, &st->r.ns_rdataset);
3832 if (st->r.r_rdataset != NULL)
3833 query_putrdataset(client, &st->r.r_rdataset);
3835 rpz_clean(&st->q.zone, &st->q.db, &st->q.node, NULL);
3836 if (st->q.rdataset != NULL)
3837 query_putrdataset(client, &st->q.rdataset);
3838 if (st->q.sigrdataset != NULL)
3839 query_putrdataset(client, &st->q.sigrdataset);
3841 st->m.type = DNS_RPZ_TYPE_BAD;
3842 st->m.policy = DNS_RPZ_POLICY_MISS;
3846 * Get NS, A, or AAAA rrset for response policy zone checks.
3849 rpz_rrset_find(ns_client_t *client, dns_rpz_type_t rpz_type,
3850 dns_name_t *name, dns_rdatatype_t type,
3851 dns_db_t **dbp, dns_dbversion_t *version,
3852 dns_rdataset_t **rdatasetp, isc_boolean_t resuming)
3855 isc_boolean_t is_zone;
3857 dns_fixedname_t fixed;
3859 isc_result_t result;
3861 st = client->query.rpz_st;
3862 if ((st->state & DNS_RPZ_RECURSING) != 0) {
3863 INSIST(st->r.r_type == type);
3864 INSIST(dns_name_equal(name, st->r_name));
3865 INSIST(*rdatasetp == NULL ||
3866 !dns_rdataset_isassociated(*rdatasetp));
3867 st->state &= ~DNS_RPZ_RECURSING;
3870 if (*rdatasetp != NULL)
3871 query_putrdataset(client, rdatasetp);
3872 *rdatasetp = st->r.r_rdataset;
3873 st->r.r_rdataset = NULL;
3874 result = st->r.r_result;
3875 if (result == DNS_R_DELEGATION) {
3876 rpz_log_fail(client, DNS_RPZ_ERROR_LEVEL,
3878 "rpz_rrset_find(1) ", result);
3879 st->m.policy = DNS_RPZ_POLICY_ERROR;
3880 result = DNS_R_SERVFAIL;
3885 result = rpz_ready(client, NULL, NULL, NULL, rdatasetp);
3886 if (result != ISC_R_SUCCESS) {
3887 st->m.policy = DNS_RPZ_POLICY_ERROR;
3891 is_zone = ISC_FALSE;
3897 result = query_getdb(client, name, type, 0, &zone, dbp,
3898 &version, &is_zone);
3899 if (result != ISC_R_SUCCESS) {
3900 rpz_log_fail(client, DNS_RPZ_ERROR_LEVEL,
3902 "rpz_rrset_find(2) ", result);
3903 st->m.policy = DNS_RPZ_POLICY_ERROR;
3905 dns_zone_detach(&zone);
3909 dns_zone_detach(&zone);
3913 dns_fixedname_init(&fixed);
3914 found = dns_fixedname_name(&fixed);
3915 result = dns_db_find(*dbp, name, version, type, DNS_DBFIND_GLUEOK,
3916 client->now, &node, found, *rdatasetp, NULL);
3917 if (result == DNS_R_DELEGATION && is_zone && USECACHE(client)) {
3919 * Try the cache if we're authoritative for an
3920 * ancestor but not the domain itself.
3922 rpz_clean(NULL, dbp, &node, rdatasetp);
3924 dns_db_attach(client->view->cachedb, dbp);
3925 result = dns_db_find(*dbp, name, version, dns_rdatatype_ns,
3926 0, client->now, &node, found,
3929 rpz_clean(NULL, dbp, &node, NULL);
3930 if (result == DNS_R_DELEGATION) {
3931 rpz_clean(NULL, NULL, NULL, rdatasetp);
3933 * Recurse for NS rrset or A or AAAA rrset for an NS.
3934 * Do not recurse for addresses for the query name.
3936 if (rpz_type == DNS_RPZ_TYPE_IP) {
3937 result = DNS_R_NXRRSET;
3939 dns_name_copy(name, st->r_name, NULL);
3940 result = query_recurse(client, type, st->r_name,
3941 NULL, NULL, resuming);
3942 if (result == ISC_R_SUCCESS) {
3943 st->state |= DNS_RPZ_RECURSING;
3944 result = DNS_R_DELEGATION;
3952 * Check the IP address in an A or AAAA rdataset against
3953 * the IP or NSIP response policy rules of a view.
3956 rpz_rewrite_ip(ns_client_t *client, dns_rdataset_t *rdataset,
3957 dns_rpz_type_t rpz_type)
3960 dns_dbversion_t *version;
3963 dns_rpz_zone_t *rpz;
3964 isc_result_t result;
3966 st = client->query.rpz_st;
3967 if (st->m.rdataset == NULL) {
3968 st->m.rdataset = query_newrdataset(client);
3969 if (st->m.rdataset == NULL)
3970 return (DNS_R_SERVFAIL);
3974 for (rpz = ISC_LIST_HEAD(client->view->rpz_zones);
3976 rpz = ISC_LIST_NEXT(rpz, link)) {
3978 * Do not check policy zones that cannot replace a policy
3979 * already known to match.
3981 if (st->m.policy != DNS_RPZ_POLICY_MISS) {
3982 if (st->m.rpz->num < rpz->num)
3984 if (st->m.rpz->num == rpz->num &&
3985 st->m.type < rpz_type)
3990 * Find the database for this policy zone to get its radix tree.
3993 result = rpz_getdb(client, rpz_type, &rpz->origin,
3994 &zone, &db, &version);
3995 if (result != ISC_R_SUCCESS) {
3996 rpz_clean(&zone, &db, NULL, NULL);
4000 * Look for a better (e.g. longer prefix) hit for an IP address
4001 * in this rdataset in this radix tree than than the previous
4002 * hit, if any. Note the domain name and quality of the
4005 (void)dns_db_rpz_findips(rpz, rpz_type, zone, db, version,
4007 client->query.rpz_st->qname);
4008 rpz_clean(&zone, &db, NULL, NULL);
4010 return (ISC_R_SUCCESS);
4014 * Look for an A or AAAA rdataset
4015 * and check for IP or NSIP rewrite policy rules.
4018 rpz_rewrite_rrset(ns_client_t *client, dns_rpz_type_t rpz_type,
4019 dns_rdatatype_t type, dns_name_t *name,
4020 dns_db_t **dbp, dns_dbversion_t *version,
4021 dns_rdataset_t **rdatasetp, isc_boolean_t resuming)
4023 isc_result_t result;
4025 result = rpz_rrset_find(client, rpz_type, name, type, dbp, version,
4026 rdatasetp, resuming);
4029 result = rpz_rewrite_ip(client, *rdatasetp, rpz_type);
4031 case DNS_R_EMPTYNAME:
4032 case DNS_R_EMPTYWILD:
4033 case DNS_R_NXDOMAIN:
4034 case DNS_R_NCACHENXDOMAIN:
4036 case DNS_R_NCACHENXRRSET:
4037 case ISC_R_NOTFOUND:
4038 result = ISC_R_SUCCESS;
4040 case DNS_R_DELEGATION:
4041 case DNS_R_DUPLICATE:
4046 rpz_log_fail(client, DNS_RPZ_DEBUG_LEVEL1, rpz_type,
4047 name, "NS address rewrite rrset ", result);
4048 result = ISC_R_SUCCESS;
4051 if (client->query.rpz_st->m.policy != DNS_RPZ_POLICY_ERROR) {
4052 client->query.rpz_st->m.policy = DNS_RPZ_POLICY_ERROR;
4053 rpz_log_fail(client, DNS_RPZ_ERROR_LEVEL, rpz_type,
4054 name, "NS address rewrite rrset ", result);
4062 * Look for both A and AAAA rdatasets
4063 * and check for IP or NSIP rewrite policy rules.
4064 * Look only for addresses that will be in the ANSWER section
4065 * when checking for IP rules.
4068 rpz_rewrite_rrsets(ns_client_t *client, dns_rpz_type_t rpz_type,
4069 dns_name_t *name, dns_rdatatype_t type,
4070 dns_rdataset_t **rdatasetp, isc_boolean_t resuming)
4073 dns_dbversion_t *version;
4075 isc_result_t result;
4077 st = client->query.rpz_st;
4080 if ((st->state & DNS_RPZ_DONE_IPv4) == 0 &&
4081 ((rpz_type == DNS_RPZ_TYPE_NSIP) ?
4082 (st->state & DNS_RPZ_HAVE_NSIPv4) :
4083 (st->state & DNS_RPZ_HAVE_IP)) != 0 &&
4084 (type == dns_rdatatype_any || type == dns_rdatatype_a)) {
4085 result = rpz_rewrite_rrset(client, rpz_type, dns_rdatatype_a,
4086 name, &ipdb, version, rdatasetp,
4088 if (result == ISC_R_SUCCESS)
4089 st->state |= DNS_RPZ_DONE_IPv4;
4091 result = ISC_R_SUCCESS;
4093 if (result == ISC_R_SUCCESS &&
4094 ((rpz_type == DNS_RPZ_TYPE_NSIP) ?
4095 (st->state & DNS_RPZ_HAVE_NSIPv6) :
4096 (st->state & DNS_RPZ_HAVE_IP)) != 0 &&
4097 (type == dns_rdatatype_any || type == dns_rdatatype_aaaa)) {
4098 result = rpz_rewrite_rrset(client, rpz_type, dns_rdatatype_aaaa,
4099 name, &ipdb, version, rdatasetp,
4103 dns_db_detach(&ipdb);
4108 * Get the rrset from a response policy zone.
4111 rpz_find(ns_client_t *client, dns_rdatatype_t qtype, dns_name_t *qnamef,
4112 dns_name_t *sname, dns_rpz_type_t rpz_type, dns_zone_t **zonep,
4113 dns_db_t **dbp, dns_dbversion_t **versionp,
4114 dns_dbnode_t **nodep, dns_rdataset_t **rdatasetp,
4115 dns_rpz_policy_t *policyp)
4117 dns_rpz_policy_t policy;
4118 dns_fixedname_t fixed;
4120 isc_result_t result;
4122 result = rpz_ready(client, zonep, dbp, nodep, rdatasetp);
4123 if (result != ISC_R_SUCCESS) {
4124 *policyp = DNS_RPZ_POLICY_ERROR;
4129 * Try to get either a CNAME or the type of record demanded by the
4130 * request from the policy zone.
4133 result = rpz_getdb(client, rpz_type, qnamef, zonep, dbp, versionp);
4134 if (result != ISC_R_SUCCESS) {
4135 *policyp = DNS_RPZ_POLICY_MISS;
4136 return (DNS_R_NXDOMAIN);
4139 dns_fixedname_init(&fixed);
4140 found = dns_fixedname_name(&fixed);
4141 result = dns_db_find(*dbp, qnamef, *versionp, dns_rdatatype_any, 0,
4142 client->now, nodep, found, *rdatasetp, NULL);
4143 if (result == ISC_R_SUCCESS) {
4144 dns_rdatasetiter_t *rdsiter;
4147 result = dns_db_allrdatasets(*dbp, *nodep, *versionp, 0,
4149 if (result != ISC_R_SUCCESS) {
4150 dns_db_detachnode(*dbp, nodep);
4151 rpz_log_fail(client, DNS_RPZ_ERROR_LEVEL, rpz_type,
4152 qnamef, "allrdatasets()", result);
4153 *policyp = DNS_RPZ_POLICY_ERROR;
4154 return (DNS_R_SERVFAIL);
4156 for (result = dns_rdatasetiter_first(rdsiter);
4157 result == ISC_R_SUCCESS;
4158 result = dns_rdatasetiter_next(rdsiter)) {
4159 dns_rdatasetiter_current(rdsiter, *rdatasetp);
4160 if ((*rdatasetp)->type == dns_rdatatype_cname ||
4161 (*rdatasetp)->type == qtype)
4163 dns_rdataset_disassociate(*rdatasetp);
4165 dns_rdatasetiter_destroy(&rdsiter);
4166 if (result != ISC_R_SUCCESS) {
4167 if (result != ISC_R_NOMORE) {
4168 rpz_log_fail(client, DNS_RPZ_ERROR_LEVEL,
4169 rpz_type, qnamef, "rdatasetiter",
4171 *policyp = DNS_RPZ_POLICY_ERROR;
4172 return (DNS_R_SERVFAIL);
4175 * Ask again to get the right DNS_R_DNAME/NXRRSET/...
4176 * result if there is neither a CNAME nor target type.
4178 if (dns_rdataset_isassociated(*rdatasetp))
4179 dns_rdataset_disassociate(*rdatasetp);
4180 dns_db_detachnode(*dbp, nodep);
4182 if (qtype == dns_rdatatype_rrsig ||
4183 qtype == dns_rdatatype_sig)
4184 result = DNS_R_NXRRSET;
4186 result = dns_db_find(*dbp, qnamef, *versionp,
4187 qtype, 0, client->now,
4188 nodep, found, *rdatasetp,
4194 if ((*rdatasetp)->type != dns_rdatatype_cname) {
4195 policy = DNS_RPZ_POLICY_RECORD;
4197 policy = dns_rpz_decode_cname(*rdatasetp, sname);
4198 if ((policy == DNS_RPZ_POLICY_RECORD ||
4199 policy == DNS_RPZ_POLICY_WILDCNAME) &&
4200 qtype != dns_rdatatype_cname &&
4201 qtype != dns_rdatatype_any)
4202 result = DNS_R_CNAME;
4207 * DNAME policy RRs have very few if any uses that are not
4208 * better served with simple wildcards. Making the work would
4209 * require complications to get the number of labels matched
4210 * in the name or the found name to the main DNS_R_DNAME case
4211 * in query_find(). So fall through to treat them as NODATA.
4214 policy = DNS_RPZ_POLICY_NODATA;
4216 case DNS_R_NXDOMAIN:
4217 case DNS_R_EMPTYNAME:
4219 * If we don't get a qname hit,
4220 * see if it is worth looking for other types.
4222 dns_db_rpz_enabled(*dbp, client->query.rpz_st);
4224 dns_zone_detach(zonep);
4225 policy = DNS_RPZ_POLICY_MISS;
4229 dns_zone_detach(zonep);
4230 rpz_log_fail(client, DNS_RPZ_ERROR_LEVEL, rpz_type, qnamef,
4232 policy = DNS_RPZ_POLICY_ERROR;
4233 result = DNS_R_SERVFAIL;
4242 * Build and look for a QNAME or NSDNAME owner name in a response policy zone.
4245 rpz_rewrite_name(ns_client_t *client, dns_rdatatype_t qtype, dns_name_t *qname,
4246 dns_rpz_type_t rpz_type, dns_rdataset_t **rdatasetp)
4249 dns_rpz_zone_t *rpz;
4250 dns_fixedname_t prefixf, rpz_qnamef;
4251 dns_name_t *prefix, *suffix, *rpz_qname;
4254 dns_dbversion_t *version;
4256 dns_rpz_policy_t policy;
4257 unsigned int labels;
4258 isc_result_t result;
4260 st = client->query.rpz_st;
4265 for (rpz = ISC_LIST_HEAD(client->view->rpz_zones);
4267 rpz = ISC_LIST_NEXT(rpz, link)) {
4269 * Do not check policy zones that cannot replace a policy
4270 * already known to match.
4272 if (st->m.policy != DNS_RPZ_POLICY_MISS) {
4273 if (st->m.rpz->num < rpz->num)
4275 if (st->m.rpz->num == rpz->num &&
4276 st->m.type < rpz_type)
4280 * Construct the policy's owner name.
4282 dns_fixedname_init(&prefixf);
4283 prefix = dns_fixedname_name(&prefixf);
4284 dns_name_split(qname, 1, prefix, NULL);
4285 if (rpz_type == DNS_RPZ_TYPE_NSDNAME)
4286 suffix = &rpz->nsdname;
4288 suffix = &rpz->origin;
4289 dns_fixedname_init(&rpz_qnamef);
4290 rpz_qname = dns_fixedname_name(&rpz_qnamef);
4292 result = dns_name_concatenate(prefix, suffix,
4294 if (result == ISC_R_SUCCESS)
4296 INSIST(result == DNS_R_NAMETOOLONG);
4297 labels = dns_name_countlabels(prefix);
4299 rpz_log_fail(client, DNS_RPZ_ERROR_LEVEL,
4301 "concatentate() ", result);
4302 return (ISC_R_SUCCESS);
4304 if (labels+1 == dns_name_countlabels(qname)) {
4305 rpz_log_fail(client, DNS_RPZ_DEBUG_LEVEL1,
4307 "concatentate() ", result);
4309 dns_name_split(prefix, labels - 1, NULL, prefix);
4313 * See if the policy record exists.
4315 result = rpz_find(client, qtype, rpz_qname, qname, rpz_type,
4316 &zone, &db, &version, &node, rdatasetp,
4319 case DNS_R_NXDOMAIN:
4320 case DNS_R_EMPTYNAME:
4322 case DNS_R_SERVFAIL:
4323 rpz_clean(&zone, &db, &node, rdatasetp);
4324 st->m.policy = DNS_RPZ_POLICY_ERROR;
4325 return (DNS_R_SERVFAIL);
4328 * We are dealing with names here.
4329 * With more than one applicable policy, prefer
4330 * the earliest configured policy,
4331 * QNAME over IP over NSDNAME over NSIP,
4332 * and the smallest name.
4333 * Because of the testing above,
4334 * we known st->m.rpz->num >= rpz->num and either
4335 * st->m.rpz->num > rpz->num or st->m.type >= rpz_type
4337 if (st->m.policy != DNS_RPZ_POLICY_MISS &&
4338 rpz->num == st->m.rpz->num &&
4339 (st->m.type < rpz_type ||
4340 (st->m.type == rpz_type &&
4341 0 >= dns_name_compare(rpz_qname, st->qname))))
4345 * Merely log DNS_RPZ_POLICY_DISABLED hits.
4347 if (rpz->policy == DNS_RPZ_POLICY_DISABLED) {
4348 rpz_log_rewrite(client, "disabled ",
4349 policy, rpz_type, rpz_qname);
4353 rpz_clean(&st->m.zone, &st->m.db, &st->m.node,
4356 st->m.type = rpz_type;
4358 st->m.policy = policy;
4359 st->m.result = result;
4360 dns_name_copy(rpz_qname, st->qname, NULL);
4361 if (*rdatasetp != NULL &&
4362 dns_rdataset_isassociated(*rdatasetp)) {
4363 dns_rdataset_t *trdataset;
4365 trdataset = st->m.rdataset;
4366 st->m.rdataset = *rdatasetp;
4367 *rdatasetp = trdataset;
4368 st->m.ttl = st->m.rdataset->ttl;
4370 st->m.ttl = DNS_RPZ_TTL_DEFAULT;
4376 st->m.version = version;
4382 rpz_clean(&zone, &db, &node, rdatasetp);
4383 return (ISC_R_SUCCESS);
4387 rpz_rewrite_ns_skip(ns_client_t *client, dns_name_t *nsname,
4388 isc_result_t result, int level, const char *str)
4392 st = client->query.rpz_st;
4395 rpz_log_fail(client, level, DNS_RPZ_TYPE_NSIP, nsname,
4397 if (st->r.ns_rdataset != NULL &&
4398 dns_rdataset_isassociated(st->r.ns_rdataset))
4399 dns_rdataset_disassociate(st->r.ns_rdataset);
4405 * Look for response policy zone QNAME, NSIP, and NSDNAME rewriting.
4408 rpz_rewrite(ns_client_t *client, dns_rdatatype_t qtype, isc_result_t qresult,
4409 isc_boolean_t resuming)
4412 dns_rdataset_t *rdataset;
4413 dns_fixedname_t nsnamef;
4415 isc_boolean_t ck_ip;
4416 isc_result_t result;
4418 st = client->query.rpz_st;
4420 st = isc_mem_get(client->mctx, sizeof(*st));
4422 return (ISC_R_NOMEMORY);
4424 memset(&st->m, 0, sizeof(st->m));
4425 st->m.type = DNS_RPZ_TYPE_BAD;
4426 st->m.policy = DNS_RPZ_POLICY_MISS;
4427 memset(&st->r, 0, sizeof(st->r));
4428 memset(&st->q, 0, sizeof(st->q));
4429 dns_fixedname_init(&st->_qnamef);
4430 dns_fixedname_init(&st->_r_namef);
4431 dns_fixedname_init(&st->_fnamef);
4432 st->qname = dns_fixedname_name(&st->_qnamef);
4433 st->r_name = dns_fixedname_name(&st->_r_namef);
4434 st->fname = dns_fixedname_name(&st->_fnamef);
4435 client->query.rpz_st = st;
4439 * There is nothing to rewrite if the main query failed.
4447 case DNS_R_EMPTYNAME:
4449 case DNS_R_NXDOMAIN:
4450 case DNS_R_EMPTYWILD:
4451 case DNS_R_NCACHENXDOMAIN:
4452 case DNS_R_NCACHENXRRSET:
4457 case DNS_R_DELEGATION:
4458 case ISC_R_NOTFOUND:
4459 return (ISC_R_SUCCESS);
4461 case ISC_R_TIMEDOUT:
4462 case DNS_R_BROKENCHAIN:
4463 rpz_log_fail(client, DNS_RPZ_DEBUG_LEVEL3, DNS_RPZ_TYPE_QNAME,
4464 client->query.qname,
4465 "stop on qresult in rpz_rewrite()",
4467 return (ISC_R_SUCCESS);
4469 rpz_log_fail(client, DNS_RPZ_DEBUG_LEVEL1, DNS_RPZ_TYPE_QNAME,
4470 client->query.qname,
4471 "stop on unrecognized qresult in rpz_rewrite()",
4473 return (ISC_R_SUCCESS);
4477 if ((st->state & DNS_RPZ_DONE_QNAME) == 0) {
4479 * Check rules for the query name if this it the first time
4480 * for the current qname, i.e. we've not been recursing.
4481 * There is a first time for each name in a CNAME chain.
4483 result = rpz_rewrite_name(client, qtype, client->query.qname,
4484 DNS_RPZ_TYPE_QNAME, &rdataset);
4485 if (result != ISC_R_SUCCESS)
4488 st->r.label = dns_name_countlabels(client->query.qname);
4490 st->state &= ~(DNS_RPZ_DONE_QNAME_IP | DNS_RPZ_DONE_IPv4);
4491 st->state |= DNS_RPZ_DONE_QNAME;
4495 * Check known IP addresses for the query name.
4496 * Any recursion required for the query has already happened.
4497 * Do not check addresses that will not be in the ANSWER section.
4499 if ((st->state & DNS_RPZ_DONE_QNAME_IP) == 0 &&
4500 (st->state & DNS_RPZ_HAVE_IP) != 0 && ck_ip) {
4501 result = rpz_rewrite_rrsets(client, DNS_RPZ_TYPE_IP,
4502 client->query.qname, qtype,
4503 &rdataset, resuming);
4504 if (result != ISC_R_SUCCESS)
4506 st->state &= ~DNS_RPZ_DONE_IPv4;
4507 st->state |= DNS_RPZ_DONE_QNAME_IP;
4511 * Stop looking for rules if there are none of the other kinds.
4513 if ((st->state & (DNS_RPZ_HAVE_NSIPv4 | DNS_RPZ_HAVE_NSIPv6 |
4514 DNS_RPZ_HAVE_NSDNAME)) == 0) {
4515 result = ISC_R_SUCCESS;
4519 dns_fixedname_init(&nsnamef);
4520 dns_name_clone(client->query.qname, dns_fixedname_name(&nsnamef));
4521 while (st->r.label > 1) {
4523 * Get NS rrset for each domain in the current qname.
4525 if (st->r.label == dns_name_countlabels(client->query.qname)) {
4526 nsname = client->query.qname;
4528 nsname = dns_fixedname_name(&nsnamef);
4529 dns_name_split(client->query.qname, st->r.label,
4532 if (st->r.ns_rdataset == NULL ||
4533 !dns_rdataset_isassociated(st->r.ns_rdataset)) {
4534 dns_db_t *db = NULL;
4535 result = rpz_rrset_find(client, DNS_RPZ_TYPE_NSDNAME,
4536 nsname, dns_rdatatype_ns,
4537 &db, NULL, &st->r.ns_rdataset,
4541 if (st->m.policy == DNS_RPZ_POLICY_ERROR)
4545 result = dns_rdataset_first(st->r.ns_rdataset);
4546 if (result != ISC_R_SUCCESS)
4548 st->state &= ~(DNS_RPZ_DONE_NSDNAME |
4551 case DNS_R_DELEGATION:
4553 case DNS_R_EMPTYNAME:
4555 case DNS_R_EMPTYWILD:
4556 case DNS_R_NXDOMAIN:
4557 case DNS_R_NCACHENXDOMAIN:
4558 case DNS_R_NCACHENXRRSET:
4559 case ISC_R_NOTFOUND:
4562 rpz_rewrite_ns_skip(client, nsname, result,
4565 case ISC_R_TIMEDOUT:
4566 case DNS_R_BROKENCHAIN:
4568 rpz_rewrite_ns_skip(client, nsname, result,
4569 DNS_RPZ_DEBUG_LEVEL3,
4573 rpz_rewrite_ns_skip(client, nsname, result,
4575 "unrecognized NS db_find() ");
4580 * Check all NS names.
4584 dns_rdata_t nsrdata = DNS_RDATA_INIT;
4586 dns_rdataset_current(st->r.ns_rdataset, &nsrdata);
4587 result = dns_rdata_tostruct(&nsrdata, &ns, NULL);
4588 dns_rdata_reset(&nsrdata);
4589 if (result != ISC_R_SUCCESS) {
4590 rpz_log_fail(client, DNS_RPZ_ERROR_LEVEL,
4591 DNS_RPZ_TYPE_NSIP, nsname,
4592 "rdata_tostruct() ", result);
4593 st->m.policy = DNS_RPZ_POLICY_ERROR;
4597 * Do nothing about "NS ."
4599 if (dns_name_equal(&ns.name, dns_rootname)) {
4600 dns_rdata_freestruct(&ns);
4601 result = dns_rdataset_next(st->r.ns_rdataset);
4605 * Check this NS name if we did not handle it
4606 * during a previous recursion.
4608 if ((st->state & DNS_RPZ_DONE_NSDNAME) == 0 &&
4609 (st->state & DNS_RPZ_HAVE_NSDNAME) != 0) {
4610 result = rpz_rewrite_name(client, qtype,
4612 DNS_RPZ_TYPE_NSDNAME,
4614 if (result != ISC_R_SUCCESS) {
4615 dns_rdata_freestruct(&ns);
4618 st->state |= DNS_RPZ_DONE_NSDNAME;
4621 * Check all IP addresses for this NS name.
4623 result = rpz_rewrite_rrsets(client, DNS_RPZ_TYPE_NSIP,
4624 &ns.name, dns_rdatatype_any,
4625 &rdataset, resuming);
4626 dns_rdata_freestruct(&ns);
4627 if (result != ISC_R_SUCCESS)
4629 st->state &= ~(DNS_RPZ_DONE_NSDNAME |
4631 result = dns_rdataset_next(st->r.ns_rdataset);
4632 } while (result == ISC_R_SUCCESS);
4633 dns_rdataset_disassociate(st->r.ns_rdataset);
4638 * Use the best, if any, hit.
4640 result = ISC_R_SUCCESS;
4643 if (st->m.policy != DNS_RPZ_POLICY_MISS &&
4644 st->m.policy != DNS_RPZ_POLICY_ERROR &&
4645 st->m.rpz->policy != DNS_RPZ_POLICY_GIVEN)
4646 st->m.policy = st->m.rpz->policy;
4647 if (st->m.policy == DNS_RPZ_POLICY_MISS ||
4648 st->m.policy == DNS_RPZ_POLICY_PASSTHRU ||
4649 st->m.policy == DNS_RPZ_POLICY_ERROR) {
4650 if (st->m.policy == DNS_RPZ_POLICY_PASSTHRU)
4651 rpz_log_rewrite(client, "", st->m.policy, st->m.type,
4653 rpz_clean(&st->m.zone, &st->m.db, &st->m.node, &st->m.rdataset);
4655 if (st->m.policy == DNS_RPZ_POLICY_ERROR) {
4656 st->m.type = DNS_RPZ_TYPE_BAD;
4657 result = DNS_R_SERVFAIL;
4659 query_putrdataset(client, &rdataset);
4660 if ((st->state & DNS_RPZ_RECURSING) == 0)
4661 rpz_clean(NULL, &st->r.db, NULL, &st->r.ns_rdataset);
4667 * Add a CNAME to the query response, including translating foo.evil.com and
4668 * *.evil.com CNAME *.example.com
4670 * foo.evil.com CNAME foo.evil.com.example.com
4673 rpz_add_cname(ns_client_t *client, dns_rpz_st_t *st,
4674 dns_name_t *cname, dns_name_t *fname, isc_buffer_t *dbuf)
4676 dns_fixedname_t prefix, suffix;
4677 unsigned int labels;
4678 isc_result_t result;
4680 labels = dns_name_countlabels(cname);
4681 if (labels > 2 && dns_name_iswildcard(cname)) {
4682 dns_fixedname_init(&prefix);
4683 dns_name_split(client->query.qname, 1,
4684 dns_fixedname_name(&prefix), NULL);
4685 dns_fixedname_init(&suffix);
4686 dns_name_split(cname, labels-1,
4687 NULL, dns_fixedname_name(&suffix));
4688 result = dns_name_concatenate(dns_fixedname_name(&prefix),
4689 dns_fixedname_name(&suffix),
4691 if (result == DNS_R_NAMETOOLONG)
4692 client->message->rcode = dns_rcode_yxdomain;
4694 result = dns_name_copy(cname, fname, NULL);
4695 RUNTIME_CHECK(result == ISC_R_SUCCESS);
4697 if (result != ISC_R_SUCCESS)
4699 query_keepname(client, fname, dbuf);
4700 result = query_add_cname(client, client->query.qname,
4701 fname, dns_trust_authanswer, st->m.ttl);
4702 if (result != ISC_R_SUCCESS)
4704 rpz_log_rewrite(client, "", st->m.policy, st->m.type, st->qname);
4705 ns_client_qnamereplace(client, fname);
4707 * Turn off DNSSEC because the results of a
4708 * response policy zone cannot verify.
4710 client->attributes &= ~NS_CLIENTATTR_WANTDNSSEC;
4711 return (ISC_R_SUCCESS);
4714 #define MAX_RESTARTS 16
4716 #define QUERY_ERROR(r) \
4719 want_restart = ISC_FALSE; \
4723 #define RECURSE_ERROR(r) \
4725 if ((r) == DNS_R_DUPLICATE || (r) == DNS_R_DROP) \
4728 QUERY_ERROR(DNS_R_SERVFAIL); \
4732 * Extract a network address from the RDATA of an A or AAAA
4737 * ISC_R_NOTIMPLEMENTED The rdata is not a known address type.
4740 rdata_tonetaddr(const dns_rdata_t *rdata, isc_netaddr_t *netaddr) {
4742 struct in6_addr in6a;
4744 switch (rdata->type) {
4745 case dns_rdatatype_a:
4746 INSIST(rdata->length == 4);
4747 memcpy(&ina.s_addr, rdata->data, 4);
4748 isc_netaddr_fromin(netaddr, &ina);
4749 return (ISC_R_SUCCESS);
4750 case dns_rdatatype_aaaa:
4751 INSIST(rdata->length == 16);
4752 memcpy(in6a.s6_addr, rdata->data, 16);
4753 isc_netaddr_fromin6(netaddr, &in6a);
4754 return (ISC_R_SUCCESS);
4756 return (ISC_R_NOTIMPLEMENTED);
4761 * Find the sort order of 'rdata' in the topology-like
4762 * ACL forming the second element in a 2-element top-level
4763 * sortlist statement.
4766 query_sortlist_order_2element(const dns_rdata_t *rdata, const void *arg) {
4767 isc_netaddr_t netaddr;
4769 if (rdata_tonetaddr(rdata, &netaddr) != ISC_R_SUCCESS)
4771 return (ns_sortlist_addrorder2(&netaddr, arg));
4775 * Find the sort order of 'rdata' in the matching element
4776 * of a 1-element top-level sortlist statement.
4779 query_sortlist_order_1element(const dns_rdata_t *rdata, const void *arg) {
4780 isc_netaddr_t netaddr;
4782 if (rdata_tonetaddr(rdata, &netaddr) != ISC_R_SUCCESS)
4784 return (ns_sortlist_addrorder1(&netaddr, arg));
4788 * Find the sortlist statement that applies to 'client' and set up
4789 * the sortlist info in in client->message appropriately.
4792 setup_query_sortlist(ns_client_t *client) {
4793 isc_netaddr_t netaddr;
4794 dns_rdatasetorderfunc_t order = NULL;
4795 const void *order_arg = NULL;
4797 isc_netaddr_fromsockaddr(&netaddr, &client->peeraddr);
4798 switch (ns_sortlist_setup(client->view->sortlist,
4799 &netaddr, &order_arg)) {
4800 case NS_SORTLISTTYPE_1ELEMENT:
4801 order = query_sortlist_order_1element;
4803 case NS_SORTLISTTYPE_2ELEMENT:
4804 order = query_sortlist_order_2element;
4806 case NS_SORTLISTTYPE_NONE:
4813 dns_message_setsortorder(client->message, order, order_arg);
4817 query_addnoqnameproof(ns_client_t *client, dns_rdataset_t *rdataset) {
4818 isc_buffer_t *dbuf, b;
4820 dns_rdataset_t *neg, *negsig;
4821 isc_result_t result = ISC_R_NOMEMORY;
4823 CTRACE("query_addnoqnameproof");
4829 dbuf = query_getnamebuf(client);
4832 fname = query_newname(client, dbuf, &b);
4833 neg = query_newrdataset(client);
4834 negsig = query_newrdataset(client);
4835 if (fname == NULL || neg == NULL || negsig == NULL)
4838 result = dns_rdataset_getnoqname(rdataset, fname, neg, negsig);
4839 RUNTIME_CHECK(result == ISC_R_SUCCESS);
4841 query_addrrset(client, &fname, &neg, &negsig, dbuf,
4842 DNS_SECTION_AUTHORITY);
4844 if ((rdataset->attributes & DNS_RDATASETATTR_CLOSEST) == 0)
4847 if (fname == NULL) {
4848 dbuf = query_getnamebuf(client);
4851 fname = query_newname(client, dbuf, &b);
4854 neg = query_newrdataset(client);
4855 else if (dns_rdataset_isassociated(neg))
4856 dns_rdataset_disassociate(neg);
4858 negsig = query_newrdataset(client);
4859 else if (dns_rdataset_isassociated(negsig))
4860 dns_rdataset_disassociate(negsig);
4861 if (fname == NULL || neg == NULL || negsig == NULL)
4863 result = dns_rdataset_getclosest(rdataset, fname, neg, negsig);
4864 RUNTIME_CHECK(result == ISC_R_SUCCESS);
4866 query_addrrset(client, &fname, &neg, &negsig, dbuf,
4867 DNS_SECTION_AUTHORITY);
4871 query_putrdataset(client, &neg);
4873 query_putrdataset(client, &negsig);
4875 query_releasename(client, &fname);
4879 answer_in_glue(ns_client_t *client, dns_rdatatype_t qtype) {
4882 dns_section_t section = DNS_SECTION_ADDITIONAL;
4883 dns_rdataset_t *rdataset = NULL;
4885 msg = client->message;
4886 for (name = ISC_LIST_HEAD(msg->sections[section]);
4888 name = ISC_LIST_NEXT(name, link))
4889 if (dns_name_equal(name, client->query.qname)) {
4890 for (rdataset = ISC_LIST_HEAD(name->list);
4892 rdataset = ISC_LIST_NEXT(rdataset, link))
4893 if (rdataset->type == qtype)
4897 if (rdataset != NULL) {
4898 ISC_LIST_UNLINK(msg->sections[section], name, link);
4899 ISC_LIST_PREPEND(msg->sections[section], name, link);
4900 ISC_LIST_UNLINK(name->list, rdataset, link);
4901 ISC_LIST_PREPEND(name->list, rdataset, link);
4902 rdataset->attributes |= DNS_RDATASETATTR_REQUIREDGLUE;
4906 #define NS_NAME_INIT(A,B) \
4909 A, sizeof(A), sizeof(B), \
4910 DNS_NAMEATTR_READONLY | DNS_NAMEATTR_ABSOLUTE, \
4911 B, NULL, { (void *)-1, (void *)-1}, \
4915 static unsigned char inaddr10_offsets[] = { 0, 3, 11, 16 };
4916 static unsigned char inaddr172_offsets[] = { 0, 3, 7, 15, 20 };
4917 static unsigned char inaddr192_offsets[] = { 0, 4, 8, 16, 21 };
4919 static unsigned char inaddr10[] = "\00210\007IN-ADDR\004ARPA";
4921 static unsigned char inaddr16172[] = "\00216\003172\007IN-ADDR\004ARPA";
4922 static unsigned char inaddr17172[] = "\00217\003172\007IN-ADDR\004ARPA";
4923 static unsigned char inaddr18172[] = "\00218\003172\007IN-ADDR\004ARPA";
4924 static unsigned char inaddr19172[] = "\00219\003172\007IN-ADDR\004ARPA";
4925 static unsigned char inaddr20172[] = "\00220\003172\007IN-ADDR\004ARPA";
4926 static unsigned char inaddr21172[] = "\00221\003172\007IN-ADDR\004ARPA";
4927 static unsigned char inaddr22172[] = "\00222\003172\007IN-ADDR\004ARPA";
4928 static unsigned char inaddr23172[] = "\00223\003172\007IN-ADDR\004ARPA";
4929 static unsigned char inaddr24172[] = "\00224\003172\007IN-ADDR\004ARPA";
4930 static unsigned char inaddr25172[] = "\00225\003172\007IN-ADDR\004ARPA";
4931 static unsigned char inaddr26172[] = "\00226\003172\007IN-ADDR\004ARPA";
4932 static unsigned char inaddr27172[] = "\00227\003172\007IN-ADDR\004ARPA";
4933 static unsigned char inaddr28172[] = "\00228\003172\007IN-ADDR\004ARPA";
4934 static unsigned char inaddr29172[] = "\00229\003172\007IN-ADDR\004ARPA";
4935 static unsigned char inaddr30172[] = "\00230\003172\007IN-ADDR\004ARPA";
4936 static unsigned char inaddr31172[] = "\00231\003172\007IN-ADDR\004ARPA";
4938 static unsigned char inaddr168192[] = "\003168\003192\007IN-ADDR\004ARPA";
4940 static dns_name_t rfc1918names[] = {
4941 NS_NAME_INIT(inaddr10, inaddr10_offsets),
4942 NS_NAME_INIT(inaddr16172, inaddr172_offsets),
4943 NS_NAME_INIT(inaddr17172, inaddr172_offsets),
4944 NS_NAME_INIT(inaddr18172, inaddr172_offsets),
4945 NS_NAME_INIT(inaddr19172, inaddr172_offsets),
4946 NS_NAME_INIT(inaddr20172, inaddr172_offsets),
4947 NS_NAME_INIT(inaddr21172, inaddr172_offsets),
4948 NS_NAME_INIT(inaddr22172, inaddr172_offsets),
4949 NS_NAME_INIT(inaddr23172, inaddr172_offsets),
4950 NS_NAME_INIT(inaddr24172, inaddr172_offsets),
4951 NS_NAME_INIT(inaddr25172, inaddr172_offsets),
4952 NS_NAME_INIT(inaddr26172, inaddr172_offsets),
4953 NS_NAME_INIT(inaddr27172, inaddr172_offsets),
4954 NS_NAME_INIT(inaddr28172, inaddr172_offsets),
4955 NS_NAME_INIT(inaddr29172, inaddr172_offsets),
4956 NS_NAME_INIT(inaddr30172, inaddr172_offsets),
4957 NS_NAME_INIT(inaddr31172, inaddr172_offsets),
4958 NS_NAME_INIT(inaddr168192, inaddr192_offsets)
4962 static unsigned char prisoner_data[] = "\010prisoner\004iana\003org";
4963 static unsigned char hostmaster_data[] = "\012hostmaster\014root-servers\003org";
4965 static unsigned char prisoner_offsets[] = { 0, 9, 14, 18 };
4966 static unsigned char hostmaster_offsets[] = { 0, 11, 24, 28 };
4968 static dns_name_t prisoner = NS_NAME_INIT(prisoner_data, prisoner_offsets);
4969 static dns_name_t hostmaster = NS_NAME_INIT(hostmaster_data, hostmaster_offsets);
4972 warn_rfc1918(ns_client_t *client, dns_name_t *fname, dns_rdataset_t *rdataset) {
4974 dns_rdata_t rdata = DNS_RDATA_INIT;
4975 dns_rdata_soa_t soa;
4976 dns_rdataset_t found;
4977 isc_result_t result;
4979 for (i = 0; i < (sizeof(rfc1918names)/sizeof(*rfc1918names)); i++) {
4980 if (dns_name_issubdomain(fname, &rfc1918names[i])) {
4981 dns_rdataset_init(&found);
4982 result = dns_ncache_getrdataset(rdataset,
4986 if (result != ISC_R_SUCCESS)
4989 result = dns_rdataset_first(&found);
4990 RUNTIME_CHECK(result == ISC_R_SUCCESS);
4991 dns_rdataset_current(&found, &rdata);
4992 result = dns_rdata_tostruct(&rdata, &soa, NULL);
4993 RUNTIME_CHECK(result == ISC_R_SUCCESS);
4994 if (dns_name_equal(&soa.origin, &prisoner) &&
4995 dns_name_equal(&soa.contact, &hostmaster)) {
4996 char buf[DNS_NAME_FORMATSIZE];
4997 dns_name_format(fname, buf, sizeof(buf));
4998 ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
5001 "RFC 1918 response from "
5002 "Internet for %s", buf);
5004 dns_rdataset_disassociate(&found);
5011 query_findclosestnsec3(dns_name_t *qname, dns_db_t *db,
5012 dns_dbversion_t *version, ns_client_t *client,
5013 dns_rdataset_t *rdataset, dns_rdataset_t *sigrdataset,
5014 dns_name_t *fname, isc_boolean_t exact,
5017 unsigned char salt[256];
5019 isc_uint16_t iterations;
5020 isc_result_t result;
5021 unsigned int dboptions;
5022 dns_fixedname_t fixed;
5027 dns_rdata_nsec3_t nsec3;
5028 dns_rdata_t rdata = DNS_RDATA_INIT;
5029 isc_boolean_t optout;
5031 salt_length = sizeof(salt);
5032 result = dns_db_getnsec3parameters(db, version, &hash, NULL,
5033 &iterations, salt, &salt_length);
5034 if (result != ISC_R_SUCCESS)
5037 dns_name_init(&name, NULL);
5038 dns_name_clone(qname, &name);
5041 * Map unknown algorithm to known value.
5043 if (hash == DNS_NSEC3_UNKNOWNALG)
5047 dns_fixedname_init(&fixed);
5048 result = dns_nsec3_hashname(&fixed, NULL, NULL, &name,
5049 dns_db_origin(db), hash,
5050 iterations, salt, salt_length);
5051 if (result != ISC_R_SUCCESS)
5054 dboptions = client->query.dboptions | DNS_DBFIND_FORCENSEC3;
5055 result = dns_db_find(db, dns_fixedname_name(&fixed), version,
5056 dns_rdatatype_nsec3, dboptions, client->now,
5057 NULL, fname, rdataset, sigrdataset);
5059 if (result == DNS_R_NXDOMAIN) {
5060 if (!dns_rdataset_isassociated(rdataset)) {
5063 result = dns_rdataset_first(rdataset);
5064 INSIST(result == ISC_R_SUCCESS);
5065 dns_rdataset_current(rdataset, &rdata);
5066 dns_rdata_tostruct(&rdata, &nsec3, NULL);
5067 dns_rdata_reset(&rdata);
5068 optout = ISC_TF((nsec3.flags & DNS_NSEC3FLAG_OPTOUT) != 0);
5069 if (found != NULL && optout &&
5070 dns_name_fullcompare(&name, dns_db_origin(db), &order,
5071 &count) == dns_namereln_subdomain) {
5072 dns_rdataset_disassociate(rdataset);
5073 if (dns_rdataset_isassociated(sigrdataset))
5074 dns_rdataset_disassociate(sigrdataset);
5075 count = dns_name_countlabels(&name) - 1;
5076 dns_name_getlabelsequence(&name, 1, count, &name);
5077 ns_client_log(client, DNS_LOGCATEGORY_DNSSEC,
5078 NS_LOGMODULE_QUERY, ISC_LOG_DEBUG(3),
5079 "looking for closest provable encloser");
5083 ns_client_log(client, DNS_LOGCATEGORY_DNSSEC,
5084 NS_LOGMODULE_QUERY, ISC_LOG_WARNING,
5085 "expected a exact match NSEC3, got "
5086 "a covering record");
5088 } else if (result != ISC_R_SUCCESS) {
5091 ns_client_log(client, DNS_LOGCATEGORY_DNSSEC,
5092 NS_LOGMODULE_QUERY, ISC_LOG_WARNING,
5093 "expected covering NSEC3, got an exact match");
5095 dns_name_copy(&name, found, NULL);
5099 #ifdef ALLOW_FILTER_AAAA_ON_V4
5100 static isc_boolean_t
5101 is_v4_client(ns_client_t *client) {
5102 if (isc_sockaddr_pf(&client->peeraddr) == AF_INET)
5104 if (isc_sockaddr_pf(&client->peeraddr) == AF_INET6 &&
5105 IN6_IS_ADDR_V4MAPPED(&client->peeraddr.type.sin6.sin6_addr))
5112 dns64_ttl(dns_db_t *db, dns_dbversion_t *version) {
5113 dns_dbnode_t *node = NULL;
5114 dns_rdata_soa_t soa;
5115 dns_rdata_t rdata = DNS_RDATA_INIT;
5116 dns_rdataset_t rdataset;
5117 isc_result_t result;
5118 isc_uint32_t ttl = ISC_UINT32_MAX;
5120 dns_rdataset_init(&rdataset);
5122 result = dns_db_getoriginnode(db, &node);
5123 if (result != ISC_R_SUCCESS)
5126 result = dns_db_findrdataset(db, node, version, dns_rdatatype_soa,
5127 0, 0, &rdataset, NULL);
5128 if (result != ISC_R_SUCCESS)
5130 result = dns_rdataset_first(&rdataset);
5131 if (result != ISC_R_SUCCESS)
5134 dns_rdataset_current(&rdataset, &rdata);
5135 result = dns_rdata_tostruct(&rdata, &soa, NULL);
5136 RUNTIME_CHECK(result == ISC_R_SUCCESS);
5137 ttl = ISC_MIN(rdataset.ttl, soa.minimum);
5140 if (dns_rdataset_isassociated(&rdataset))
5141 dns_rdataset_disassociate(&rdataset);
5143 dns_db_detachnode(db, &node);
5147 static isc_boolean_t
5148 dns64_aaaaok(ns_client_t *client, dns_rdataset_t *rdataset,
5149 dns_rdataset_t *sigrdataset)
5151 isc_netaddr_t netaddr;
5152 dns_dns64_t *dns64 = ISC_LIST_HEAD(client->view->dns64);
5153 unsigned int flags = 0;
5154 unsigned int i, count;
5155 isc_boolean_t *aaaaok;
5157 INSIST(client->query.dns64_aaaaok == NULL);
5158 INSIST(client->query.dns64_aaaaoklen == 0);
5159 INSIST(client->query.dns64_aaaa == NULL);
5160 INSIST(client->query.dns64_sigaaaa == NULL);
5165 if (RECURSIONOK(client))
5166 flags |= DNS_DNS64_RECURSIVE;
5168 if (sigrdataset != NULL && dns_rdataset_isassociated(sigrdataset))
5169 flags |= DNS_DNS64_DNSSEC;
5171 count = dns_rdataset_count(rdataset);
5172 aaaaok = isc_mem_get(client->mctx, sizeof(isc_boolean_t) * count);
5174 isc_netaddr_fromsockaddr(&netaddr, &client->peeraddr);
5175 if (dns_dns64_aaaaok(dns64, &netaddr, client->signer,
5176 &ns_g_server->aclenv, flags, rdataset,
5178 for (i = 0; i < count; i++) {
5179 if (aaaaok != NULL && !aaaaok[i]) {
5180 client->query.dns64_aaaaok = aaaaok;
5181 client->query.dns64_aaaaoklen = count;
5185 if (i == count && aaaaok != NULL)
5186 isc_mem_put(client->mctx, aaaaok,
5187 sizeof(isc_boolean_t) * count);
5191 isc_mem_put(client->mctx, aaaaok,
5192 sizeof(isc_boolean_t) * count);
5197 * Do the bulk of query processing for the current query of 'client'.
5198 * If 'event' is non-NULL, we are returning from recursion and 'qtype'
5199 * is ignored. Otherwise, 'qtype' is the query type.
5202 query_find(ns_client_t *client, dns_fetchevent_t *event, dns_rdatatype_t qtype)
5206 dns_rdatatype_t type;
5207 dns_name_t *fname, *zfname, *tname, *prefix;
5208 dns_rdataset_t *rdataset, *trdataset;
5209 dns_rdataset_t *sigrdataset, *zrdataset, *zsigrdataset;
5210 dns_rdataset_t **sigrdatasetp;
5211 dns_rdata_t rdata = DNS_RDATA_INIT;
5212 dns_rdatasetiter_t *rdsiter;
5213 isc_boolean_t want_restart, authoritative, is_zone, need_wildcardproof;
5214 isc_boolean_t is_staticstub_zone;
5215 unsigned int n, nlabels;
5216 dns_namereln_t namereln;
5220 isc_result_t result, eresult;
5221 dns_fixedname_t fixed;
5222 dns_fixedname_t wildcardname;
5223 dns_dbversion_t *version, *zversion;
5225 dns_rdata_cname_t cname;
5226 dns_rdata_dname_t dname;
5227 unsigned int options;
5228 isc_boolean_t empty_wild;
5229 dns_rdataset_t *noqname;
5230 dns_rpz_st_t *rpz_st;
5231 isc_boolean_t resuming;
5233 isc_boolean_t dns64_exclude, dns64;
5235 CTRACE("query_find");
5238 * One-time initialization.
5240 * It's especially important to initialize anything that the cleanup
5241 * code might cleanup.
5244 eresult = ISC_R_SUCCESS;
5250 zsigrdataset = NULL;
5257 need_wildcardproof = ISC_FALSE;
5258 empty_wild = ISC_FALSE;
5259 dns64_exclude = dns64 = ISC_FALSE;
5261 resuming = ISC_FALSE;
5262 is_zone = ISC_FALSE;
5263 is_staticstub_zone = ISC_FALSE;
5265 if (event != NULL) {
5267 * We're returning from recursion. Restore the query context
5270 want_restart = ISC_FALSE;
5272 rpz_st = client->query.rpz_st;
5273 if (rpz_st != NULL &&
5274 (rpz_st->state & DNS_RPZ_RECURSING) != 0) {
5275 is_zone = rpz_st->q.is_zone;
5276 authoritative = rpz_st->q.authoritative;
5277 zone = rpz_st->q.zone;
5278 rpz_st->q.zone = NULL;
5279 node = rpz_st->q.node;
5280 rpz_st->q.node = NULL;
5282 rpz_st->q.db = NULL;
5283 rdataset = rpz_st->q.rdataset;
5284 rpz_st->q.rdataset = NULL;
5285 sigrdataset = rpz_st->q.sigrdataset;
5286 rpz_st->q.sigrdataset = NULL;
5287 qtype = rpz_st->q.qtype;
5289 rpz_st->r.db = event->db;
5290 if (event->node != NULL)
5291 dns_db_detachnode(event->db, &event->node);
5292 rpz_st->r.r_type = event->qtype;
5293 rpz_st->r.r_rdataset = event->rdataset;
5294 query_putrdataset(client, &event->sigrdataset);
5296 authoritative = ISC_FALSE;
5298 qtype = event->qtype;
5301 rdataset = event->rdataset;
5302 sigrdataset = event->sigrdataset;
5305 if (qtype == dns_rdatatype_rrsig || qtype == dns_rdatatype_sig)
5306 type = dns_rdatatype_any;
5310 if (DNS64(client)) {
5311 client->query.attributes &= ~NS_QUERYATTR_DNS64;
5314 if (DNS64EXCLUDE(client)) {
5315 client->query.attributes &= ~NS_QUERYATTR_DNS64EXCLUDE;
5316 dns64_exclude = ISC_TRUE;
5320 * We'll need some resources...
5322 dbuf = query_getnamebuf(client);
5324 QUERY_ERROR(DNS_R_SERVFAIL);
5327 fname = query_newname(client, dbuf, &b);
5328 if (fname == NULL) {
5329 QUERY_ERROR(DNS_R_SERVFAIL);
5332 if (rpz_st != NULL &&
5333 (rpz_st->state & DNS_RPZ_RECURSING) != 0) {
5334 tname = rpz_st->fname;
5336 tname = dns_fixedname_name(&event->foundname);
5338 result = dns_name_copy(tname, fname, NULL);
5339 if (result != ISC_R_SUCCESS) {
5340 QUERY_ERROR(DNS_R_SERVFAIL);
5343 if (rpz_st != NULL &&
5344 (rpz_st->state & DNS_RPZ_RECURSING) != 0) {
5345 rpz_st->r.r_result = event->result;
5346 result = rpz_st->q.result;
5347 isc_event_free(ISC_EVENT_PTR(&event));
5349 result = event->result;
5351 resuming = ISC_TRUE;
5356 * Not returning from recursion.
5360 * If it's a SIG query, we'll iterate the node.
5362 if (qtype == dns_rdatatype_rrsig || qtype == dns_rdatatype_sig)
5363 type = dns_rdatatype_any;
5368 CTRACE("query_find: restart");
5369 want_restart = ISC_FALSE;
5370 authoritative = ISC_FALSE;
5372 need_wildcardproof = ISC_FALSE;
5374 if (client->view->checknames &&
5375 !dns_rdata_checkowner(client->query.qname,
5376 client->message->rdclass,
5377 qtype, ISC_FALSE)) {
5378 char namebuf[DNS_NAME_FORMATSIZE];
5379 char typename[DNS_RDATATYPE_FORMATSIZE];
5380 char classname[DNS_RDATACLASS_FORMATSIZE];
5382 dns_name_format(client->query.qname, namebuf, sizeof(namebuf));
5383 dns_rdatatype_format(qtype, typename, sizeof(typename));
5384 dns_rdataclass_format(client->message->rdclass, classname,
5386 ns_client_log(client, DNS_LOGCATEGORY_SECURITY,
5387 NS_LOGMODULE_QUERY, ISC_LOG_ERROR,
5388 "check-names failure %s/%s/%s", namebuf,
5389 typename, classname);
5390 QUERY_ERROR(DNS_R_REFUSED);
5395 * First we must find the right database.
5397 options &= DNS_GETDB_NOLOG; /* Preserve DNS_GETDB_NOLOG. */
5398 if (dns_rdatatype_atparent(qtype) &&
5399 !dns_name_equal(client->query.qname, dns_rootname))
5400 options |= DNS_GETDB_NOEXACT;
5401 result = query_getdb(client, client->query.qname, qtype, options,
5402 &zone, &db, &version, &is_zone);
5403 if ((result != ISC_R_SUCCESS || !is_zone) && !RECURSIONOK(client) &&
5404 (options & DNS_GETDB_NOEXACT) != 0 && qtype == dns_rdatatype_ds) {
5406 * Look to see if we are authoritative for the
5407 * child zone if the query type is DS.
5409 dns_db_t *tdb = NULL;
5410 dns_zone_t *tzone = NULL;
5411 dns_dbversion_t *tversion = NULL;
5412 isc_result_t tresult;
5414 tresult = query_getzonedb(client, client->query.qname, qtype,
5415 DNS_GETDB_PARTIAL, &tzone, &tdb,
5417 if (tresult == ISC_R_SUCCESS) {
5418 options &= ~DNS_GETDB_NOEXACT;
5419 query_putrdataset(client, &rdataset);
5423 dns_zone_detach(&zone);
5428 result = ISC_R_SUCCESS;
5431 dns_db_detach(&tdb);
5433 dns_zone_detach(&tzone);
5436 if (result != ISC_R_SUCCESS) {
5437 if (result == DNS_R_REFUSED) {
5438 if (WANTRECURSION(client)) {
5440 dns_nsstatscounter_recurserej);
5442 inc_stats(client, dns_nsstatscounter_authrej);
5443 if (!PARTIALANSWER(client))
5444 QUERY_ERROR(DNS_R_REFUSED);
5446 QUERY_ERROR(DNS_R_SERVFAIL);
5450 is_staticstub_zone = ISC_FALSE;
5452 authoritative = ISC_TRUE;
5454 dns_zone_gettype(zone) == dns_zone_staticstub)
5455 is_staticstub_zone = ISC_TRUE;
5458 if (event == NULL && client->query.restarts == 0) {
5462 * if is_zone = true, zone = NULL then this is
5463 * a DLZ zone. Don't attempt to attach zone.
5465 dns_zone_attach(zone, &client->query.authzone);
5467 dns_db_attach(db, &client->query.authdb);
5469 client->query.authdbset = ISC_TRUE;
5473 CTRACE("query_find: db_find");
5475 * We'll need some resources...
5477 dbuf = query_getnamebuf(client);
5479 QUERY_ERROR(DNS_R_SERVFAIL);
5482 fname = query_newname(client, dbuf, &b);
5483 rdataset = query_newrdataset(client);
5484 if (fname == NULL || rdataset == NULL) {
5485 QUERY_ERROR(DNS_R_SERVFAIL);
5488 if (WANTDNSSEC(client) && (!is_zone || dns_db_issecure(db))) {
5489 sigrdataset = query_newrdataset(client);
5490 if (sigrdataset == NULL) {
5491 QUERY_ERROR(DNS_R_SERVFAIL);
5497 * Now look for an answer in the database.
5499 result = dns_db_find(db, client->query.qname, version, type,
5500 client->query.dboptions, client->now,
5501 &node, fname, rdataset, sigrdataset);
5504 CTRACE("query_find: resume");
5506 if (!ISC_LIST_EMPTY(client->view->rpz_zones) &&
5507 RECURSIONOK(client) && !RECURSING(client) &&
5508 (!WANTDNSSEC(client) || sigrdataset == NULL ||
5509 !dns_rdataset_isassociated(sigrdataset)) &&
5510 (client->query.rpz_st == NULL ||
5511 (client->query.rpz_st->state & DNS_RPZ_REWRITTEN) == 0) &&
5512 !dns_name_equal(client->query.qname, dns_rootname)) {
5513 isc_result_t rresult;
5515 rresult = rpz_rewrite(client, qtype, result, resuming);
5516 rpz_st = client->query.rpz_st;
5520 case DNS_R_DELEGATION:
5522 * recursing for NS names or addresses,
5523 * so save the main query state
5525 rpz_st->q.qtype = qtype;
5526 rpz_st->q.is_zone = is_zone;
5527 rpz_st->q.authoritative = authoritative;
5528 rpz_st->q.zone = zone;
5532 rpz_st->q.node = node;
5534 rpz_st->q.rdataset = rdataset;
5536 rpz_st->q.sigrdataset = sigrdataset;
5538 dns_name_copy(fname, rpz_st->fname, NULL);
5539 rpz_st->q.result = result;
5540 client->query.attributes |= NS_QUERYATTR_RECURSING;
5543 RECURSE_ERROR(rresult);
5546 if (rpz_st->m.policy != DNS_RPZ_POLICY_MISS)
5547 rpz_st->state |= DNS_RPZ_REWRITTEN;
5548 if (rpz_st->m.policy != DNS_RPZ_POLICY_MISS &&
5549 rpz_st->m.policy != DNS_RPZ_POLICY_PASSTHRU &&
5550 rpz_st->m.policy != DNS_RPZ_POLICY_ERROR) {
5551 if (rpz_st->m.type == DNS_RPZ_TYPE_QNAME) {
5552 result = dns_name_copy(client->query.qname,
5554 RUNTIME_CHECK(result == ISC_R_SUCCESS);
5556 rpz_clean(&zone, &db, &node, NULL);
5557 if (rpz_st->m.rdataset != NULL) {
5558 query_putrdataset(client, &rdataset);
5559 rdataset = rpz_st->m.rdataset;
5560 rpz_st->m.rdataset = NULL;
5561 } else if (rdataset != NULL &&
5562 dns_rdataset_isassociated(rdataset)) {
5563 dns_rdataset_disassociate(rdataset);
5565 node = rpz_st->m.node;
5566 rpz_st->m.node = NULL;
5568 rpz_st->m.db = NULL;
5569 version = rpz_st->m.version;
5570 rpz_st->m.version = NULL;
5571 zone = rpz_st->m.zone;
5572 rpz_st->m.zone = NULL;
5574 switch (rpz_st->m.policy) {
5575 case DNS_RPZ_POLICY_NXDOMAIN:
5576 result = DNS_R_NXDOMAIN;
5578 case DNS_RPZ_POLICY_NODATA:
5579 result = DNS_R_NXRRSET;
5581 case DNS_RPZ_POLICY_RECORD:
5582 result = rpz_st->m.result;
5583 if (type == dns_rdatatype_any &&
5584 result != DNS_R_CNAME &&
5585 dns_rdataset_isassociated(rdataset))
5586 dns_rdataset_disassociate(rdataset);
5588 case DNS_RPZ_POLICY_WILDCNAME:
5589 result = dns_rdataset_first(rdataset);
5590 RUNTIME_CHECK(result == ISC_R_SUCCESS);
5591 dns_rdataset_current(rdataset, &rdata);
5592 result = dns_rdata_tostruct(&rdata, &cname,
5594 RUNTIME_CHECK(result == ISC_R_SUCCESS);
5595 dns_rdata_reset(&rdata);
5596 result = rpz_add_cname(client, rpz_st,
5599 if (result != ISC_R_SUCCESS)
5602 want_restart = ISC_TRUE;
5604 case DNS_RPZ_POLICY_CNAME:
5606 * Add overridding CNAME from a named.conf
5607 * response-policy statement
5609 result = rpz_add_cname(client, rpz_st,
5610 &rpz_st->m.rpz->cname,
5612 if (result != ISC_R_SUCCESS)
5615 want_restart = ISC_TRUE;
5622 * Turn off DNSSEC because the results of a
5623 * response policy zone cannot verify.
5625 client->attributes &= ~NS_CLIENTATTR_WANTDNSSEC;
5626 query_putrdataset(client, &sigrdataset);
5628 rpz_log_rewrite(client, "", rpz_st->m.policy,
5629 rpz_st->m.type, rpz_st->qname);
5636 * This case is handled in the main line below.
5642 * These cases are handled in the main line below.
5645 authoritative = ISC_FALSE;
5647 case ISC_R_NOTFOUND:
5649 * The cache doesn't even have the root NS. Get them from
5656 if (client->view->hints == NULL) {
5657 /* We have no hints. */
5658 result = ISC_R_FAILURE;
5660 dns_db_attach(client->view->hints, &db);
5661 result = dns_db_find(db, dns_rootname,
5662 NULL, dns_rdatatype_ns,
5663 0, client->now, &node, fname,
5664 rdataset, sigrdataset);
5666 if (result != ISC_R_SUCCESS) {
5668 * Nonsensical root hints may require cleanup.
5670 if (dns_rdataset_isassociated(rdataset))
5671 dns_rdataset_disassociate(rdataset);
5672 if (sigrdataset != NULL &&
5673 dns_rdataset_isassociated(sigrdataset))
5674 dns_rdataset_disassociate(sigrdataset);
5676 dns_db_detachnode(db, &node);
5679 * We don't have any root server hints, but
5680 * we may have working forwarders, so try to
5683 if (RECURSIONOK(client)) {
5684 result = query_recurse(client, qtype,
5685 client->query.qname,
5686 NULL, NULL, resuming);
5687 if (result == ISC_R_SUCCESS) {
5688 client->query.attributes |=
5689 NS_QUERYATTR_RECURSING;
5691 client->query.attributes |=
5694 client->query.attributes |=
5695 NS_QUERYATTR_DNS64EXCLUDE;
5697 RECURSE_ERROR(result);
5700 /* Unable to give root server referral. */
5701 QUERY_ERROR(DNS_R_SERVFAIL);
5706 * XXXRTH We should trigger root server priming here.
5709 case DNS_R_DELEGATION:
5710 authoritative = ISC_FALSE;
5713 * Look to see if we are authoritative for the
5714 * child zone if the query type is DS.
5716 if (!RECURSIONOK(client) &&
5717 (options & DNS_GETDB_NOEXACT) != 0 &&
5718 qtype == dns_rdatatype_ds) {
5719 dns_db_t *tdb = NULL;
5720 dns_zone_t *tzone = NULL;
5721 dns_dbversion_t *tversion = NULL;
5722 result = query_getzonedb(client,
5723 client->query.qname,
5728 if (result == ISC_R_SUCCESS) {
5729 options &= ~DNS_GETDB_NOEXACT;
5730 query_putrdataset(client, &rdataset);
5731 if (sigrdataset != NULL)
5732 query_putrdataset(client,
5735 query_releasename(client,
5738 dns_db_detachnode(db, &node);
5742 dns_zone_detach(&zone);
5746 authoritative = ISC_TRUE;
5750 dns_db_detach(&tdb);
5752 dns_zone_detach(&tzone);
5755 * We're authoritative for an ancestor of QNAME.
5757 if (!USECACHE(client) || !RECURSIONOK(client)) {
5758 dns_fixedname_t fixed;
5760 dns_fixedname_init(&fixed);
5761 dns_name_copy(fname,
5762 dns_fixedname_name(&fixed), NULL);
5765 * If we don't have a cache, this is the best
5768 * If the client is making a nonrecursive
5769 * query we always give out the authoritative
5770 * delegation. This way even if we get
5771 * junk in our cache, we won't fail in our
5772 * role as the delegating authority if another
5773 * nameserver asks us about a delegated
5776 * We enable the retrieval of glue for this
5777 * database by setting client->query.gluedb.
5779 client->query.gluedb = db;
5780 client->query.isreferral = ISC_TRUE;
5782 * We must ensure NOADDITIONAL is off,
5783 * because the generation of
5784 * additional data is required in
5787 client->query.attributes &=
5788 ~NS_QUERYATTR_NOADDITIONAL;
5789 if (sigrdataset != NULL)
5790 sigrdatasetp = &sigrdataset;
5792 sigrdatasetp = NULL;
5793 query_addrrset(client, &fname,
5794 &rdataset, sigrdatasetp,
5795 dbuf, DNS_SECTION_AUTHORITY);
5796 client->query.gluedb = NULL;
5797 if (WANTDNSSEC(client))
5798 query_addds(client, db, node, version,
5799 dns_fixedname_name(&fixed));
5802 * We might have a better answer or delegation
5803 * in the cache. We'll remember the current
5804 * values of fname, rdataset, and sigrdataset.
5805 * We'll then go looking for QNAME in the
5806 * cache. If we find something better, we'll
5809 query_keepname(client, fname, dbuf);
5813 zrdataset = rdataset;
5815 zsigrdataset = sigrdataset;
5817 dns_db_detachnode(db, &node);
5821 dns_db_attach(client->view->cachedb, &db);
5822 is_zone = ISC_FALSE;
5826 if (zfname != NULL &&
5827 (!dns_name_issubdomain(fname, zfname) ||
5828 (is_staticstub_zone &&
5829 dns_name_equal(fname, zfname)))) {
5831 * In the following cases use "authoritative"
5832 * data instead of the cache delegation:
5833 * 1. We've already got a delegation from
5834 * authoritative data, and it is better
5835 * than what we found in the cache.
5836 * 2. The query name matches the origin name
5837 * of a static-stub zone. This needs to be
5838 * considered for the case where the NS of
5839 * the static-stub zone and the cached NS
5840 * are different. We still need to contact
5841 * the nameservers configured in the
5844 query_releasename(client, &fname);
5848 * We've already done query_keepname() on
5849 * zfname, so we must set dbuf to NULL to
5850 * prevent query_addrrset() from trying to
5851 * call query_keepname() again.
5854 query_putrdataset(client, &rdataset);
5855 if (sigrdataset != NULL)
5856 query_putrdataset(client,
5858 rdataset = zrdataset;
5860 sigrdataset = zsigrdataset;
5861 zsigrdataset = NULL;
5865 * We don't clean up zdb here because we
5866 * may still need it. It will get cleaned
5867 * up by the main cleanup code.
5871 if (RECURSIONOK(client)) {
5875 if (dns_rdatatype_atparent(type))
5876 result = query_recurse(client, qtype,
5877 client->query.qname,
5878 NULL, NULL, resuming);
5880 result = query_recurse(client,
5882 client->query.qname,
5883 NULL, NULL, resuming);
5885 result = query_recurse(client, qtype,
5886 client->query.qname,
5890 if (result == ISC_R_SUCCESS) {
5891 client->query.attributes |=
5892 NS_QUERYATTR_RECURSING;
5894 client->query.attributes |=
5897 client->query.attributes |=
5898 NS_QUERYATTR_DNS64EXCLUDE;
5899 } else if (result == DNS_R_DUPLICATE ||
5900 result == DNS_R_DROP)
5901 QUERY_ERROR(result);
5903 RECURSE_ERROR(result);
5905 dns_fixedname_t fixed;
5907 dns_fixedname_init(&fixed);
5908 dns_name_copy(fname,
5909 dns_fixedname_name(&fixed), NULL);
5911 * This is the best answer.
5913 client->query.attributes |=
5914 NS_QUERYATTR_CACHEGLUEOK;
5915 client->query.gluedb = zdb;
5916 client->query.isreferral = ISC_TRUE;
5918 * We must ensure NOADDITIONAL is off,
5919 * because the generation of
5920 * additional data is required in
5923 client->query.attributes &=
5924 ~NS_QUERYATTR_NOADDITIONAL;
5925 if (sigrdataset != NULL)
5926 sigrdatasetp = &sigrdataset;
5928 sigrdatasetp = NULL;
5929 query_addrrset(client, &fname,
5930 &rdataset, sigrdatasetp,
5931 dbuf, DNS_SECTION_AUTHORITY);
5932 client->query.gluedb = NULL;
5933 client->query.attributes &=
5934 ~NS_QUERYATTR_CACHEGLUEOK;
5935 if (WANTDNSSEC(client))
5936 query_addds(client, db, node, version,
5937 dns_fixedname_name(&fixed));
5942 case DNS_R_EMPTYNAME:
5947 #ifdef dns64_bis_return_excluded_addresses
5950 if (dns64 && !dns64_exclude)
5954 * Restore the answers from the previous AAAA lookup.
5956 if (rdataset != NULL)
5957 query_putrdataset(client, &rdataset);
5958 if (sigrdataset != NULL)
5959 query_putrdataset(client, &sigrdataset);
5960 rdataset = client->query.dns64_aaaa;
5961 sigrdataset = client->query.dns64_sigaaaa;
5962 client->query.dns64_aaaa = NULL;
5963 client->query.dns64_sigaaaa = NULL;
5964 if (fname == NULL) {
5965 dbuf = query_getnamebuf(client);
5967 QUERY_ERROR(DNS_R_SERVFAIL);
5970 fname = query_newname(client, dbuf, &b);
5971 if (fname == NULL) {
5972 QUERY_ERROR(DNS_R_SERVFAIL);
5976 dns_name_copy(client->query.qname, fname, NULL);
5978 #ifdef dns64_bis_return_excluded_addresses
5980 * Resume the diverted processing of the AAAA response?
5985 } else if (result == DNS_R_NXRRSET &&
5986 !ISC_LIST_EMPTY(client->view->dns64) &&
5987 client->message->rdclass == dns_rdataclass_in &&
5988 qtype == dns_rdatatype_aaaa)
5991 * Look to see if there are A records for this
5994 INSIST(client->query.dns64_aaaa == NULL);
5995 INSIST(client->query.dns64_sigaaaa == NULL);
5996 client->query.dns64_aaaa = rdataset;
5997 client->query.dns64_sigaaaa = sigrdataset;
5998 client->query.dns64_ttl = dns64_ttl(db, version);
5999 query_releasename(client, &fname);
6000 dns_db_detachnode(db, &node);
6003 type = qtype = dns_rdatatype_a;
6009 * Look for a NSEC3 record if we don't have a NSEC record.
6012 if (!dns_rdataset_isassociated(rdataset) &&
6013 WANTDNSSEC(client)) {
6014 if ((fname->attributes & DNS_NAMEATTR_WILDCARD) == 0) {
6018 dns_fixedname_init(&fixed);
6019 found = dns_fixedname_name(&fixed);
6020 qname = client->query.qname;
6022 query_findclosestnsec3(qname, db, version,
6027 * Did we find the closest provable encloser
6028 * instead? If so add the nearest to the
6029 * closest provable encloser.
6031 if (dns_rdataset_isassociated(rdataset) &&
6032 !dns_name_equal(qname, found)) {
6037 * Add the closest provable encloser.
6039 query_addrrset(client, &fname,
6040 &rdataset, &sigrdataset,
6042 DNS_SECTION_AUTHORITY);
6044 count = dns_name_countlabels(found)
6046 skip = dns_name_countlabels(qname) -
6048 dns_name_getlabelsequence(qname, skip,
6052 fixfname(client, &fname, &dbuf, &b);
6053 fixrdataset(client, &rdataset);
6054 fixrdataset(client, &sigrdataset);
6055 if (fname == NULL ||
6057 sigrdataset == NULL) {
6058 QUERY_ERROR(DNS_R_SERVFAIL);
6062 * 'nearest' doesn't exist so
6063 * 'exist' is set to ISC_FALSE.
6065 query_findclosestnsec3(found, db,
6075 query_releasename(client, &fname);
6076 query_addwildcardproof(client, db, version,
6077 client->query.qname,
6078 ISC_FALSE, ISC_TRUE);
6081 if (dns_rdataset_isassociated(rdataset)) {
6083 * If we've got a NSEC record, we need to save the
6084 * name now because we're going call query_addsoa()
6085 * below, and it needs to use the name buffer.
6087 query_keepname(client, fname, dbuf);
6088 } else if (fname != NULL) {
6090 * We're not going to use fname, and need to release
6091 * our hold on the name buffer so query_addsoa()
6094 query_releasename(client, &fname);
6099 result = query_addsoa(client, db, version, ISC_UINT32_MAX,
6100 dns_rdataset_isassociated(rdataset));
6101 if (result != ISC_R_SUCCESS) {
6102 QUERY_ERROR(result);
6106 * Add NSEC record if we found one.
6108 if (WANTDNSSEC(client)) {
6109 if (dns_rdataset_isassociated(rdataset))
6110 query_addnxrrsetnsec(client, db, version,
6116 case DNS_R_EMPTYWILD:
6117 empty_wild = ISC_TRUE;
6120 case DNS_R_NXDOMAIN:
6122 if (dns_rdataset_isassociated(rdataset)) {
6124 * If we've got a NSEC record, we need to save the
6125 * name now because we're going call query_addsoa()
6126 * below, and it needs to use the name buffer.
6128 query_keepname(client, fname, dbuf);
6129 } else if (fname != NULL) {
6131 * We're not going to use fname, and need to release
6132 * our hold on the name buffer so query_addsoa()
6135 query_releasename(client, &fname);
6139 * Add SOA. If the query was for a SOA record force the
6140 * ttl to zero so that it is possible for clients to find
6141 * the containing zone of an arbitrary name with a stub
6142 * resolver and not have it cached.
6144 if (qtype == dns_rdatatype_soa &&
6146 dns_zone_getzeronosoattl(zone))
6147 result = query_addsoa(client, db, version, 0,
6148 dns_rdataset_isassociated(rdataset));
6150 result = query_addsoa(client, db, version,
6152 dns_rdataset_isassociated(rdataset));
6153 if (result != ISC_R_SUCCESS) {
6154 QUERY_ERROR(result);
6158 if (WANTDNSSEC(client)) {
6160 * Add NSEC record if we found one.
6162 if (dns_rdataset_isassociated(rdataset))
6163 query_addrrset(client, &fname, &rdataset,
6165 NULL, DNS_SECTION_AUTHORITY);
6166 query_addwildcardproof(client, db, version,
6167 client->query.qname, ISC_FALSE,
6172 * Set message rcode.
6175 client->message->rcode = dns_rcode_noerror;
6177 client->message->rcode = dns_rcode_nxdomain;
6180 case DNS_R_NCACHENXDOMAIN:
6181 case DNS_R_NCACHENXRRSET:
6184 authoritative = ISC_FALSE;
6186 * Set message rcode, if required.
6188 if (result == DNS_R_NCACHENXDOMAIN)
6189 client->message->rcode = dns_rcode_nxdomain;
6191 * Look for RFC 1918 leakage from Internet.
6193 if (result == DNS_R_NCACHENXDOMAIN &&
6194 qtype == dns_rdatatype_ptr &&
6195 client->message->rdclass == dns_rdataclass_in &&
6196 dns_name_countlabels(fname) == 7)
6197 warn_rfc1918(client, fname, rdataset);
6199 #ifdef dns64_bis_return_excluded_addresses
6202 if (dns64 && !dns64_exclude)
6206 * Restore the answers from the previous AAAA lookup.
6208 if (rdataset != NULL)
6209 query_putrdataset(client, &rdataset);
6210 if (sigrdataset != NULL)
6211 query_putrdataset(client, &sigrdataset);
6212 rdataset = client->query.dns64_aaaa;
6213 sigrdataset = client->query.dns64_sigaaaa;
6214 client->query.dns64_aaaa = NULL;
6215 client->query.dns64_sigaaaa = NULL;
6216 if (fname == NULL) {
6217 dbuf = query_getnamebuf(client);
6219 QUERY_ERROR(DNS_R_SERVFAIL);
6222 fname = query_newname(client, dbuf, &b);
6223 if (fname == NULL) {
6224 QUERY_ERROR(DNS_R_SERVFAIL);
6228 dns_name_copy(client->query.qname, fname, NULL);
6230 #ifdef dns64_bis_return_excluded_addresses
6234 } else if (result == DNS_R_NCACHENXRRSET &&
6235 !ISC_LIST_EMPTY(client->view->dns64) &&
6236 client->message->rdclass == dns_rdataclass_in &&
6237 qtype == dns_rdatatype_aaaa)
6240 * Look to see if there are A records for this
6243 INSIST(client->query.dns64_aaaa == NULL);
6244 INSIST(client->query.dns64_sigaaaa == NULL);
6245 client->query.dns64_aaaa = rdataset;
6246 client->query.dns64_sigaaaa = sigrdataset;
6248 * If the ttl is zero we need to workout if we have just
6249 * decremented to zero or if there was no negative cache
6250 * ttl in the answer.
6252 if (rdataset->ttl != 0)
6253 client->query.dns64_ttl = rdataset->ttl;
6254 else if (dns_rdataset_first(rdataset) == ISC_R_SUCCESS)
6255 client->query.dns64_ttl = 0;
6256 query_releasename(client, &fname);
6257 dns_db_detachnode(db, &node);
6261 type = qtype = dns_rdatatype_a;
6267 * We don't call query_addrrset() because we don't need any
6268 * of its extra features (and things would probably break!).
6270 query_keepname(client, fname, dbuf);
6271 dns_message_addname(client->message, fname,
6272 DNS_SECTION_AUTHORITY);
6273 ISC_LIST_APPEND(fname->list, rdataset, link);
6280 * Keep a copy of the rdataset. We have to do this because
6281 * query_addrrset may clear 'rdataset' (to prevent the
6282 * cleanup code from cleaning it up).
6284 trdataset = rdataset;
6286 * Add the CNAME to the answer section.
6288 if (sigrdataset != NULL)
6289 sigrdatasetp = &sigrdataset;
6291 sigrdatasetp = NULL;
6292 if (WANTDNSSEC(client) &&
6293 (fname->attributes & DNS_NAMEATTR_WILDCARD) != 0)
6295 dns_fixedname_init(&wildcardname);
6296 dns_name_copy(fname, dns_fixedname_name(&wildcardname),
6298 need_wildcardproof = ISC_TRUE;
6300 if (NOQNAME(rdataset) && WANTDNSSEC(client))
6304 query_addrrset(client, &fname, &rdataset, sigrdatasetp, dbuf,
6305 DNS_SECTION_ANSWER);
6306 if (noqname != NULL)
6307 query_addnoqnameproof(client, noqname);
6309 * We set the PARTIALANSWER attribute so that if anything goes
6310 * wrong later on, we'll return what we've got so far.
6312 client->query.attributes |= NS_QUERYATTR_PARTIALANSWER;
6314 * Reset qname to be the target name of the CNAME and restart
6318 result = dns_message_gettempname(client->message, &tname);
6319 if (result != ISC_R_SUCCESS)
6321 result = dns_rdataset_first(trdataset);
6322 if (result != ISC_R_SUCCESS) {
6323 dns_message_puttempname(client->message, &tname);
6326 dns_rdataset_current(trdataset, &rdata);
6327 result = dns_rdata_tostruct(&rdata, &cname, NULL);
6328 dns_rdata_reset(&rdata);
6329 if (result != ISC_R_SUCCESS) {
6330 dns_message_puttempname(client->message, &tname);
6333 dns_name_init(tname, NULL);
6334 result = dns_name_dup(&cname.cname, client->mctx, tname);
6335 if (result != ISC_R_SUCCESS) {
6336 dns_message_puttempname(client->message, &tname);
6337 dns_rdata_freestruct(&cname);
6340 dns_rdata_freestruct(&cname);
6341 ns_client_qnamereplace(client, tname);
6342 want_restart = ISC_TRUE;
6343 if (!WANTRECURSION(client))
6344 options |= DNS_GETDB_NOLOG;
6348 * Compare the current qname to the found name. We need
6349 * to know how many labels and bits are in common because
6350 * we're going to have to split qname later on.
6352 namereln = dns_name_fullcompare(client->query.qname, fname,
6354 INSIST(namereln == dns_namereln_subdomain);
6356 * Keep a copy of the rdataset. We have to do this because
6357 * query_addrrset may clear 'rdataset' (to prevent the
6358 * cleanup code from cleaning it up).
6360 trdataset = rdataset;
6362 * Add the DNAME to the answer section.
6364 if (sigrdataset != NULL)
6365 sigrdatasetp = &sigrdataset;
6367 sigrdatasetp = NULL;
6368 if (WANTDNSSEC(client) &&
6369 (fname->attributes & DNS_NAMEATTR_WILDCARD) != 0)
6371 dns_fixedname_init(&wildcardname);
6372 dns_name_copy(fname, dns_fixedname_name(&wildcardname),
6374 need_wildcardproof = ISC_TRUE;
6376 query_addrrset(client, &fname, &rdataset, sigrdatasetp, dbuf,
6377 DNS_SECTION_ANSWER);
6379 * We set the PARTIALANSWER attribute so that if anything goes
6380 * wrong later on, we'll return what we've got so far.
6382 client->query.attributes |= NS_QUERYATTR_PARTIALANSWER;
6384 * Get the target name of the DNAME.
6387 result = dns_message_gettempname(client->message, &tname);
6388 if (result != ISC_R_SUCCESS)
6390 result = dns_rdataset_first(trdataset);
6391 if (result != ISC_R_SUCCESS) {
6392 dns_message_puttempname(client->message, &tname);
6395 dns_rdataset_current(trdataset, &rdata);
6396 result = dns_rdata_tostruct(&rdata, &dname, NULL);
6397 dns_rdata_reset(&rdata);
6398 if (result != ISC_R_SUCCESS) {
6399 dns_message_puttempname(client->message, &tname);
6402 dns_name_clone(&dname.dname, tname);
6403 dns_rdata_freestruct(&dname);
6405 * Construct the new qname consisting of
6406 * <found name prefix>.<dname target>
6408 dns_fixedname_init(&fixed);
6409 prefix = dns_fixedname_name(&fixed);
6410 dns_name_split(client->query.qname, nlabels, prefix, NULL);
6411 INSIST(fname == NULL);
6412 dbuf = query_getnamebuf(client);
6414 dns_message_puttempname(client->message, &tname);
6417 fname = query_newname(client, dbuf, &b);
6418 if (fname == NULL) {
6419 dns_message_puttempname(client->message, &tname);
6422 result = dns_name_concatenate(prefix, tname, fname, NULL);
6423 dns_message_puttempname(client->message, &tname);
6426 * RFC2672, section 4.1, subsection 3c says
6427 * we should return YXDOMAIN if the constructed
6428 * name would be too long.
6430 if (result == DNS_R_NAMETOOLONG)
6431 client->message->rcode = dns_rcode_yxdomain;
6432 if (result != ISC_R_SUCCESS)
6435 query_keepname(client, fname, dbuf);
6437 * Synthesize a CNAME consisting of
6438 * <old qname> <dname ttl> CNAME <new qname>
6439 * with <dname trust value>
6441 * Synthesize a CNAME so old old clients that don't understand
6444 * We do not try to synthesize a signature because we hope
6445 * that security aware servers will understand DNAME. Also,
6446 * even if we had an online key, making a signature
6447 * on-the-fly is costly, and not really legitimate anyway
6448 * since the synthesized CNAME is NOT in the zone.
6450 result = query_add_cname(client, client->query.qname, fname,
6451 trdataset->trust, trdataset->ttl);
6452 if (result != ISC_R_SUCCESS)
6455 * Switch to the new qname and restart.
6457 ns_client_qnamereplace(client, fname);
6459 want_restart = ISC_TRUE;
6460 if (!WANTRECURSION(client))
6461 options |= DNS_GETDB_NOLOG;
6465 * Something has gone wrong.
6467 QUERY_ERROR(DNS_R_SERVFAIL);
6471 if (WANTDNSSEC(client) &&
6472 (fname->attributes & DNS_NAMEATTR_WILDCARD) != 0)
6474 dns_fixedname_init(&wildcardname);
6475 dns_name_copy(fname, dns_fixedname_name(&wildcardname), NULL);
6476 need_wildcardproof = ISC_TRUE;
6479 #ifdef ALLOW_FILTER_AAAA_ON_V4
6480 if (client->view->v4_aaaa != dns_v4_aaaa_ok &&
6481 is_v4_client(client) &&
6482 ns_client_checkaclsilent(client, NULL,
6483 client->view->v4_aaaa_acl,
6484 ISC_TRUE) == ISC_R_SUCCESS)
6485 client->filter_aaaa = client->view->v4_aaaa;
6487 client->filter_aaaa = dns_v4_aaaa_ok;
6491 if (type == dns_rdatatype_any) {
6492 #ifdef ALLOW_FILTER_AAAA_ON_V4
6493 isc_boolean_t have_aaaa, have_a, have_sig;
6496 * The filter-aaaa-on-v4 option should
6497 * suppress AAAAs for IPv4 clients if there is an A.
6498 * If we are not authoritative, assume there is a A
6499 * even in if it is not in our cache. This assumption could
6500 * be wrong but it is a good bet.
6502 have_aaaa = ISC_FALSE;
6503 have_a = !authoritative;
6504 have_sig = ISC_FALSE;
6507 * XXXRTH Need to handle zonecuts with special case
6512 result = dns_db_allrdatasets(db, node, version, 0, &rdsiter);
6513 if (result != ISC_R_SUCCESS) {
6514 QUERY_ERROR(DNS_R_SERVFAIL);
6519 * Calling query_addrrset() with a non-NULL dbuf is going
6520 * to either keep or release the name. We don't want it to
6521 * release fname, since we may have to call query_addrrset()
6522 * more than once. That means we have to call query_keepname()
6523 * now, and pass a NULL dbuf to query_addrrset().
6525 * If we do a query_addrrset() below, we must set fname to
6526 * NULL before leaving this block, otherwise we might try to
6527 * cleanup fname even though we're using it!
6529 query_keepname(client, fname, dbuf);
6531 result = dns_rdatasetiter_first(rdsiter);
6532 while (result == ISC_R_SUCCESS) {
6533 dns_rdatasetiter_current(rdsiter, rdataset);
6534 #ifdef ALLOW_FILTER_AAAA_ON_V4
6536 * Notice the presence of A and AAAAs so
6537 * that AAAAs can be hidden from IPv4 clients.
6539 if (client->filter_aaaa != dns_v4_aaaa_ok) {
6540 if (rdataset->type == dns_rdatatype_aaaa)
6541 have_aaaa = ISC_TRUE;
6542 else if (rdataset->type == dns_rdatatype_a)
6546 if (is_zone && qtype == dns_rdatatype_any &&
6547 !dns_db_issecure(db) &&
6548 dns_rdatatype_isdnssec(rdataset->type)) {
6550 * The zone is transitioning from insecure
6551 * to secure. Hide the dnssec records from
6554 dns_rdataset_disassociate(rdataset);
6555 } else if ((qtype == dns_rdatatype_any ||
6556 rdataset->type == qtype) && rdataset->type != 0) {
6557 #ifdef ALLOW_FILTER_AAAA_ON_V4
6558 if (dns_rdatatype_isdnssec(rdataset->type))
6559 have_sig = ISC_TRUE;
6561 if (NOQNAME(rdataset) && WANTDNSSEC(client))
6565 query_addrrset(client,
6566 fname != NULL ? &fname : &tname,
6568 NULL, DNS_SECTION_ANSWER);
6569 if (noqname != NULL)
6570 query_addnoqnameproof(client, noqname);
6572 INSIST(tname != NULL);
6574 * rdataset is non-NULL only in certain
6575 * pathological cases involving DNAMEs.
6577 if (rdataset != NULL)
6578 query_putrdataset(client, &rdataset);
6579 rdataset = query_newrdataset(client);
6580 if (rdataset == NULL)
6584 * We're not interested in this rdataset.
6586 dns_rdataset_disassociate(rdataset);
6588 result = dns_rdatasetiter_next(rdsiter);
6591 #ifdef ALLOW_FILTER_AAAA_ON_V4
6593 * Filter AAAAs if there is an A and there is no signature
6594 * or we are supposed to break DNSSEC.
6596 if (client->filter_aaaa == dns_v4_aaaa_break_dnssec)
6597 client->attributes |= NS_CLIENTATTR_FILTER_AAAA;
6598 else if (client->filter_aaaa != dns_v4_aaaa_ok &&
6599 have_aaaa && have_a &&
6600 (!have_sig || !WANTDNSSEC(client)))
6601 client->attributes |= NS_CLIENTATTR_FILTER_AAAA;
6604 dns_message_puttempname(client->message, &fname);
6608 * No matching rdatasets found in cache. If we were
6609 * searching for RRSIG/SIG, that's probably okay;
6610 * otherwise this is an error condition.
6612 if ((qtype == dns_rdatatype_rrsig ||
6613 qtype == dns_rdatatype_sig) &&
6614 result == ISC_R_NOMORE) {
6616 authoritative = ISC_FALSE;
6617 dns_rdatasetiter_destroy(&rdsiter);
6618 client->attributes &= ~NS_CLIENTATTR_RA;
6622 if (dns_db_issecure(db)) {
6623 char namebuf[DNS_NAME_FORMATSIZE];
6624 dns_name_format(client->query.qname,
6627 ns_client_log(client,
6628 DNS_LOGCATEGORY_DNSSEC,
6631 "missing signature "
6635 dns_rdatasetiter_destroy(&rdsiter);
6636 fname = query_newname(client, dbuf, &b);
6639 result = DNS_R_SERVFAIL;
6642 dns_rdatasetiter_destroy(&rdsiter);
6643 if (result != ISC_R_NOMORE) {
6644 QUERY_ERROR(DNS_R_SERVFAIL);
6649 * This is the "normal" case -- an ordinary question to which
6650 * we know the answer.
6653 #ifdef ALLOW_FILTER_AAAA_ON_V4
6655 * Optionally hide AAAAs from IPv4 clients if there is an A.
6656 * We add the AAAAs now, but might refuse to render them later
6657 * after DNSSEC is figured out.
6658 * This could be more efficient, but the whole idea is
6659 * so fundamentally wrong, unavoidably inaccurate, and
6660 * unneeded that it is best to keep it as short as possible.
6662 if (client->filter_aaaa == dns_v4_aaaa_break_dnssec ||
6663 (client->filter_aaaa == dns_v4_aaaa_filter &&
6664 (!WANTDNSSEC(client) || sigrdataset == NULL ||
6665 !dns_rdataset_isassociated(sigrdataset))))
6667 if (qtype == dns_rdatatype_aaaa) {
6668 trdataset = query_newrdataset(client);
6669 result = dns_db_findrdataset(db, node, version,
6673 if (dns_rdataset_isassociated(trdataset))
6674 dns_rdataset_disassociate(trdataset);
6675 query_putrdataset(client, &trdataset);
6678 * We have an AAAA but the A is not in our cache.
6679 * Assume any result other than DNS_R_DELEGATION
6680 * or ISC_R_NOTFOUND means there is no A and
6682 * Assume there is no A if we can't recurse
6683 * for this client, although that could be
6684 * the wrong answer. What else can we do?
6685 * Besides, that we have the AAAA and are using
6686 * this mechanism suggests that we care more
6687 * about As than AAAAs and would have cached
6688 * the A if it existed.
6690 if (result == ISC_R_SUCCESS) {
6691 client->attributes |=
6692 NS_CLIENTATTR_FILTER_AAAA;
6694 } else if (authoritative ||
6695 !RECURSIONOK(client) ||
6696 (result != DNS_R_DELEGATION &&
6697 result != ISC_R_NOTFOUND)) {
6698 client->attributes &=
6699 ~NS_CLIENTATTR_FILTER_AAAA;
6702 * This is an ugly kludge to recurse
6703 * for the A and discard the result.
6705 * Continue to add the AAAA now.
6706 * We'll make a note to not render it
6707 * if the recursion for the A succeeds.
6709 result = query_recurse(client,
6711 client->query.qname,
6712 NULL, NULL, resuming);
6713 if (result == ISC_R_SUCCESS) {
6714 client->attributes |=
6715 NS_CLIENTATTR_FILTER_AAAA_RC;
6716 client->query.attributes |=
6717 NS_QUERYATTR_RECURSING;
6721 } else if (qtype == dns_rdatatype_a &&
6722 (client->attributes &
6723 NS_CLIENTATTR_FILTER_AAAA_RC) != 0) {
6724 client->attributes &=
6725 ~NS_CLIENTATTR_FILTER_AAAA_RC;
6726 client->attributes |=
6727 NS_CLIENTATTR_FILTER_AAAA;
6728 dns_rdataset_disassociate(rdataset);
6729 if (sigrdataset != NULL &&
6730 dns_rdataset_isassociated(sigrdataset))
6731 dns_rdataset_disassociate(sigrdataset);
6737 * Check to see if the AAAA RRset has non-excluded addresses
6738 * in it. If not look for a A RRset.
6740 INSIST(client->query.dns64_aaaaok == NULL);
6742 if (qtype == dns_rdatatype_aaaa && !dns64_exclude &&
6743 !ISC_LIST_EMPTY(client->view->dns64) &&
6744 client->message->rdclass == dns_rdataclass_in &&
6745 !dns64_aaaaok(client, rdataset, sigrdataset)) {
6747 * Look to see if there are A records for this
6750 client->query.dns64_aaaa = rdataset;
6751 client->query.dns64_sigaaaa = sigrdataset;
6752 client->query.dns64_ttl = rdataset->ttl;
6753 query_releasename(client, &fname);
6754 dns_db_detachnode(db, &node);
6757 type = qtype = dns_rdatatype_a;
6758 dns64_exclude = dns64 = ISC_TRUE;
6762 if (sigrdataset != NULL)
6763 sigrdatasetp = &sigrdataset;
6765 sigrdatasetp = NULL;
6766 if (NOQNAME(rdataset) && WANTDNSSEC(client))
6771 * BIND 8 priming queries need the additional section.
6773 if (is_zone && qtype == dns_rdatatype_ns &&
6774 dns_name_equal(client->query.qname, dns_rootname))
6775 client->query.attributes &= ~NS_QUERYATTR_NOADDITIONAL;
6778 qtype = type = dns_rdatatype_aaaa;
6779 result = query_dns64(client, &fname, rdataset,
6781 DNS_SECTION_ANSWER);
6782 dns_rdataset_disassociate(rdataset);
6783 dns_message_puttemprdataset(client->message, &rdataset);
6784 if (result == ISC_R_NOMORE) {
6785 #ifndef dns64_bis_return_excluded_addresses
6786 if (dns64_exclude) {
6790 * Add a fake SOA record.
6792 (void)query_addsoa(client, db, version,
6798 goto iszone_nxrrset;
6800 goto ncache_nxrrset;
6801 } else if (result != ISC_R_SUCCESS) {
6805 } else if (client->query.dns64_aaaaok != NULL) {
6806 query_filter64(client, &fname, rdataset, dbuf,
6807 DNS_SECTION_ANSWER);
6808 query_putrdataset(client, &rdataset);
6810 query_addrrset(client, &fname, &rdataset,
6811 sigrdatasetp, dbuf, DNS_SECTION_ANSWER);
6813 if (noqname != NULL)
6814 query_addnoqnameproof(client, noqname);
6816 * We shouldn't ever fail to add 'rdataset'
6817 * because it's already in the answer.
6819 INSIST(rdataset == NULL);
6823 CTRACE("query_find: addauth");
6825 * Add NS records to the authority section (if we haven't already
6826 * added them to the answer section).
6828 if (!want_restart && !NOAUTHORITY(client)) {
6830 if (!((qtype == dns_rdatatype_ns ||
6831 qtype == dns_rdatatype_any) &&
6832 dns_name_equal(client->query.qname,
6833 dns_db_origin(db))))
6834 (void)query_addns(client, db, version);
6835 } else if (qtype != dns_rdatatype_ns) {
6837 query_releasename(client, &fname);
6838 query_addbestns(client);
6843 * Add NSEC records to the authority section if they're needed for
6844 * DNSSEC wildcard proofs.
6846 if (need_wildcardproof && dns_db_issecure(db))
6847 query_addwildcardproof(client, db, version,
6848 dns_fixedname_name(&wildcardname),
6849 ISC_TRUE, ISC_FALSE);
6851 CTRACE("query_find: cleanup");
6855 rpz_st = client->query.rpz_st;
6856 if (rpz_st != NULL && (rpz_st->state & DNS_RPZ_RECURSING) == 0) {
6857 rpz_clean(&rpz_st->m.zone, &rpz_st->m.db, &rpz_st->m.node,
6858 &rpz_st->m.rdataset);
6859 rpz_st->state &= ~DNS_RPZ_DONE_QNAME;
6861 if (rdataset != NULL)
6862 query_putrdataset(client, &rdataset);
6863 if (sigrdataset != NULL)
6864 query_putrdataset(client, &sigrdataset);
6866 query_releasename(client, &fname);
6868 dns_db_detachnode(db, &node);
6872 dns_zone_detach(&zone);
6874 query_putrdataset(client, &zrdataset);
6875 if (zsigrdataset != NULL)
6876 query_putrdataset(client, &zsigrdataset);
6878 query_releasename(client, &zfname);
6879 dns_db_detach(&zdb);
6882 isc_event_free(ISC_EVENT_PTR(&event));
6887 if (client->query.restarts == 0 && !authoritative) {
6889 * We're not authoritative, so we must ensure the AA bit
6892 client->message->flags &= ~DNS_MESSAGEFLAG_AA;
6896 * Restart the query?
6898 if (want_restart && client->query.restarts < MAX_RESTARTS) {
6899 client->query.restarts++;
6903 if (eresult != ISC_R_SUCCESS &&
6904 (!PARTIALANSWER(client) || WANTRECURSION(client))) {
6905 if (eresult == DNS_R_DUPLICATE || eresult == DNS_R_DROP) {
6907 * This was a duplicate query that we are
6908 * recursing on. Don't send a response now.
6909 * The original query will still cause a response.
6911 query_next(client, eresult);
6914 * If we don't have any answer to give the client,
6915 * or if the client requested recursion and thus wanted
6916 * the complete answer, send an error response.
6919 query_error(client, eresult, line);
6921 ns_client_detach(&client);
6922 } else if (!RECURSING(client)) {
6924 * We are done. Set up sortlist data for the message
6925 * rendering code, make a final tweak to the AA bit if the
6926 * auth-nxdomain config option says so, then render and
6927 * send the response.
6929 setup_query_sortlist(client);
6932 * If this is a referral and the answer to the question
6933 * is in the glue sort it to the start of the additional
6936 if (ISC_LIST_EMPTY(client->message->sections[DNS_SECTION_ANSWER]) &&
6937 client->message->rcode == dns_rcode_noerror &&
6938 (qtype == dns_rdatatype_a || qtype == dns_rdatatype_aaaa))
6939 answer_in_glue(client, qtype);
6941 if (client->message->rcode == dns_rcode_nxdomain &&
6942 client->view->auth_nxdomain == ISC_TRUE)
6943 client->message->flags |= DNS_MESSAGEFLAG_AA;
6946 * If the response is somehow unexpected for the client and this
6947 * is a result of recursion, return an error to the caller
6948 * to indicate it may need to be logged.
6951 (ISC_LIST_EMPTY(client->message->sections[DNS_SECTION_ANSWER]) ||
6952 client->message->rcode != dns_rcode_noerror))
6953 eresult = ISC_R_FAILURE;
6956 ns_client_detach(&client);
6958 CTRACE("query_find: done");
6964 log_query(ns_client_t *client, unsigned int flags, unsigned int extflags) {
6965 char namebuf[DNS_NAME_FORMATSIZE];
6966 char typename[DNS_RDATATYPE_FORMATSIZE];
6967 char classname[DNS_RDATACLASS_FORMATSIZE];
6968 char onbuf[ISC_NETADDR_FORMATSIZE];
6969 dns_rdataset_t *rdataset;
6970 int level = ISC_LOG_INFO;
6972 if (! isc_log_wouldlog(ns_g_lctx, level))
6975 rdataset = ISC_LIST_HEAD(client->query.qname->list);
6976 INSIST(rdataset != NULL);
6977 dns_name_format(client->query.qname, namebuf, sizeof(namebuf));
6978 dns_rdataclass_format(rdataset->rdclass, classname, sizeof(classname));
6979 dns_rdatatype_format(rdataset->type, typename, sizeof(typename));
6980 isc_netaddr_format(&client->destaddr, onbuf, sizeof(onbuf));
6982 ns_client_log(client, NS_LOGCATEGORY_QUERIES, NS_LOGMODULE_QUERY,
6983 level, "query: %s %s %s %s%s%s%s%s%s (%s)", namebuf,
6984 classname, typename, WANTRECURSION(client) ? "+" : "-",
6985 (client->signer != NULL) ? "S": "",
6986 (client->opt != NULL) ? "E" : "",
6987 ((client->attributes & NS_CLIENTATTR_TCP) != 0) ?
6989 ((extflags & DNS_MESSAGEEXTFLAG_DO) != 0) ? "D" : "",
6990 ((flags & DNS_MESSAGEFLAG_CD) != 0) ? "C" : "",
6995 log_queryerror(ns_client_t *client, isc_result_t result, int line, int level) {
6996 char namebuf[DNS_NAME_FORMATSIZE];
6997 char typename[DNS_RDATATYPE_FORMATSIZE];
6998 char classname[DNS_RDATACLASS_FORMATSIZE];
6999 const char *namep, *typep, *classp, *sep1, *sep2;
7000 dns_rdataset_t *rdataset;
7002 if (!isc_log_wouldlog(ns_g_lctx, level))
7005 namep = typep = classp = sep1 = sep2 = "";
7008 * Query errors can happen for various reasons. In some cases we cannot
7009 * even assume the query contains a valid question section, so we should
7010 * expect exceptional cases.
7012 if (client->query.origqname != NULL) {
7013 dns_name_format(client->query.origqname, namebuf,
7018 rdataset = ISC_LIST_HEAD(client->query.origqname->list);
7019 if (rdataset != NULL) {
7020 dns_rdataclass_format(rdataset->rdclass, classname,
7023 dns_rdatatype_format(rdataset->type, typename,
7030 ns_client_log(client, NS_LOGCATEGORY_QUERY_EERRORS, NS_LOGMODULE_QUERY,
7031 level, "query failed (%s)%s%s%s%s%s%s at %s:%d",
7032 isc_result_totext(result), sep1, namep, sep2,
7033 classp, sep2, typep, __FILE__, line);
7037 ns_query_start(ns_client_t *client) {
7038 isc_result_t result;
7039 dns_message_t *message = client->message;
7040 dns_rdataset_t *rdataset;
7041 ns_client_t *qclient;
7042 dns_rdatatype_t qtype;
7043 unsigned int saved_extflags = client->extflags;
7044 unsigned int saved_flags = client->message->flags;
7045 isc_boolean_t want_ad;
7047 CTRACE("ns_query_start");
7052 if (ns_g_clienttest && (client->attributes & NS_CLIENTATTR_TCP) == 0)
7053 RUNTIME_CHECK(ns_client_replace(client) == ISC_R_SUCCESS);
7056 * Ensure that appropriate cleanups occur.
7058 client->next = query_next_callback;
7061 * Behave as if we don't support DNSSEC if not enabled.
7063 if (!client->view->enablednssec) {
7064 message->flags &= ~DNS_MESSAGEFLAG_CD;
7065 client->extflags &= ~DNS_MESSAGEEXTFLAG_DO;
7066 if (client->opt != NULL)
7067 client->opt->ttl &= ~DNS_MESSAGEEXTFLAG_DO;
7070 if ((message->flags & DNS_MESSAGEFLAG_RD) != 0)
7071 client->query.attributes |= NS_QUERYATTR_WANTRECURSION;
7073 if ((client->extflags & DNS_MESSAGEEXTFLAG_DO) != 0)
7074 client->attributes |= NS_CLIENTATTR_WANTDNSSEC;
7076 if (client->view->minimalresponses)
7077 client->query.attributes |= (NS_QUERYATTR_NOAUTHORITY |
7078 NS_QUERYATTR_NOADDITIONAL);
7080 if ((client->view->cachedb == NULL)
7081 || (!client->view->additionalfromcache)) {
7083 * We don't have a cache. Turn off cache support and
7086 client->query.attributes &=
7087 ~(NS_QUERYATTR_RECURSIONOK|NS_QUERYATTR_CACHEOK);
7088 } else if ((client->attributes & NS_CLIENTATTR_RA) == 0 ||
7089 (message->flags & DNS_MESSAGEFLAG_RD) == 0) {
7091 * If the client isn't allowed to recurse (due to
7092 * "recursion no", the allow-recursion ACL, or the
7093 * lack of a resolver in this view), or if it
7094 * doesn't want recursion, turn recursion off.
7096 client->query.attributes &= ~NS_QUERYATTR_RECURSIONOK;
7100 * Get the question name.
7102 result = dns_message_firstname(message, DNS_SECTION_QUESTION);
7103 if (result != ISC_R_SUCCESS) {
7104 query_error(client, result, __LINE__);
7107 dns_message_currentname(message, DNS_SECTION_QUESTION,
7108 &client->query.qname);
7109 client->query.origqname = client->query.qname;
7110 result = dns_message_nextname(message, DNS_SECTION_QUESTION);
7111 if (result != ISC_R_NOMORE) {
7112 if (result == ISC_R_SUCCESS) {
7114 * There's more than one QNAME in the question
7117 query_error(client, DNS_R_FORMERR, __LINE__);
7119 query_error(client, result, __LINE__);
7123 if (ns_g_server->log_queries)
7124 log_query(client, saved_flags, saved_extflags);
7127 * Check for multiple question queries, since edns1 is dead.
7129 if (message->counts[DNS_SECTION_QUESTION] > 1) {
7130 query_error(client, DNS_R_FORMERR, __LINE__);
7135 * Check for meta-queries like IXFR and AXFR.
7137 rdataset = ISC_LIST_HEAD(client->query.qname->list);
7138 INSIST(rdataset != NULL);
7139 qtype = rdataset->type;
7140 dns_rdatatypestats_increment(ns_g_server->rcvquerystats, qtype);
7141 if (dns_rdatatype_ismeta(qtype)) {
7143 case dns_rdatatype_any:
7144 break; /* Let query_find handle it. */
7145 case dns_rdatatype_ixfr:
7146 case dns_rdatatype_axfr:
7147 ns_xfr_start(client, rdataset->type);
7149 case dns_rdatatype_maila:
7150 case dns_rdatatype_mailb:
7151 query_error(client, DNS_R_NOTIMP, __LINE__);
7153 case dns_rdatatype_tkey:
7154 result = dns_tkey_processquery(client->message,
7155 ns_g_server->tkeyctx,
7156 client->view->dynamickeys);
7157 if (result == ISC_R_SUCCESS)
7160 query_error(client, result, __LINE__);
7162 default: /* TSIG, etc. */
7163 query_error(client, DNS_R_FORMERR, __LINE__);
7169 * Turn on minimal response for DNSKEY and DS queries.
7171 if (qtype == dns_rdatatype_dnskey || qtype == dns_rdatatype_ds)
7172 client->query.attributes |= (NS_QUERYATTR_NOAUTHORITY |
7173 NS_QUERYATTR_NOADDITIONAL);
7176 * Turn on minimal responses for EDNS/UDP bufsize 512 queries.
7178 if (client->opt != NULL && client->udpsize <= 512U &&
7179 (client->attributes & NS_CLIENTATTR_TCP) == 0)
7180 client->query.attributes |= (NS_QUERYATTR_NOAUTHORITY |
7181 NS_QUERYATTR_NOADDITIONAL);
7184 * If the client has requested that DNSSEC checking be disabled,
7185 * allow lookups to return pending data and instruct the resolver
7186 * to return data before validation has completed.
7188 * We don't need to set DNS_DBFIND_PENDINGOK when validation is
7189 * disabled as there will be no pending data.
7191 if (message->flags & DNS_MESSAGEFLAG_CD ||
7192 qtype == dns_rdatatype_rrsig)
7194 client->query.dboptions |= DNS_DBFIND_PENDINGOK;
7195 client->query.fetchoptions |= DNS_FETCHOPT_NOVALIDATE;
7196 } else if (!client->view->enablevalidation)
7197 client->query.fetchoptions |= DNS_FETCHOPT_NOVALIDATE;
7200 * Allow glue NS records to be added to the authority section
7201 * if the answer is secure.
7203 if (message->flags & DNS_MESSAGEFLAG_CD)
7204 client->query.attributes &= ~NS_QUERYATTR_SECURE;
7207 * Set 'want_ad' if the client has set AD in the query.
7208 * This allows AD to be returned on queries without DO set.
7210 if ((message->flags & DNS_MESSAGEFLAG_AD) != 0)
7213 want_ad = ISC_FALSE;
7216 * This is an ordinary query.
7218 result = dns_message_reply(message, ISC_TRUE);
7219 if (result != ISC_R_SUCCESS) {
7220 query_next(client, result);
7225 * Assume authoritative response until it is known to be
7228 * If "-T noaa" has been set on the command line don't set
7229 * AA on authoritative answers.
7232 message->flags |= DNS_MESSAGEFLAG_AA;
7235 * Set AD. We must clear it if we add non-validated data to a
7238 if (WANTDNSSEC(client) || want_ad)
7239 message->flags |= DNS_MESSAGEFLAG_AD;
7242 ns_client_attach(client, &qclient);
7243 (void)query_find(qclient, NULL, qtype);