2 * Copyright (C) 2009-2012 Internet Systems Consortium, Inc. ("ISC")
4 * Permission to use, copy, modify, and/or distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
8 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
9 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
10 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
11 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
12 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
13 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
14 * PERFORMANCE OF THIS SOFTWARE.
25 #include <isc/mutex.h>
26 #include <isc/sockaddr.h>
27 #include <isc/socket.h>
29 #include <isc/timer.h>
33 #include <dns/client.h>
35 #include <dns/dispatch.h>
36 #include <dns/events.h>
37 #include <dns/forward.h>
38 #include <dns/keytable.h>
39 #include <dns/message.h>
41 #include <dns/rdata.h>
42 #include <dns/rdatalist.h>
43 #include <dns/rdataset.h>
44 #include <dns/rdatatype.h>
45 #include <dns/rdatasetiter.h>
46 #include <dns/rdatastruct.h>
47 #include <dns/request.h>
48 #include <dns/resolver.h>
49 #include <dns/result.h>
56 #define DNS_CLIENT_MAGIC ISC_MAGIC('D', 'N', 'S', 'c')
57 #define DNS_CLIENT_VALID(c) ISC_MAGIC_VALID(c, DNS_CLIENT_MAGIC)
59 #define RCTX_MAGIC ISC_MAGIC('R', 'c', 't', 'x')
60 #define RCTX_VALID(c) ISC_MAGIC_VALID(c, RCTX_MAGIC)
62 #define REQCTX_MAGIC ISC_MAGIC('R', 'q', 'c', 'x')
63 #define REQCTX_VALID(c) ISC_MAGIC_VALID(c, REQCTX_MAGIC)
65 #define UCTX_MAGIC ISC_MAGIC('U', 'c', 't', 'x')
66 #define UCTX_VALID(c) ISC_MAGIC_VALID(c, UCTX_MAGIC)
68 #define MAX_RESTARTS 16
76 unsigned int attributes;
80 isc_taskmgr_t *taskmgr;
82 isc_socketmgr_t *socketmgr;
83 isc_timermgr_t *timermgr;
84 dns_dispatchmgr_t *dispatchmgr;
85 dns_dispatch_t *dispatchv4;
86 dns_dispatch_t *dispatchv6;
88 unsigned int update_timeout;
89 unsigned int update_udptimeout;
90 unsigned int update_udpretries;
91 unsigned int find_timeout;
92 unsigned int find_udpretries;
95 unsigned int references;
96 dns_viewlist_t viewlist;
97 ISC_LIST(struct resctx) resctxs;
98 ISC_LIST(struct reqctx) reqctxs;
99 ISC_LIST(struct updatectx) updatectxs;
103 * Timeout/retry constants for dynamic update borrowed from nsupdate
105 #define DEF_UPDATE_TIMEOUT 300
106 #define MIN_UPDATE_TIMEOUT 30
107 #define DEF_UPDATE_UDPTIMEOUT 3
108 #define DEF_UPDATE_UDPRETRIES 3
110 #define DEF_FIND_TIMEOUT 5
111 #define DEF_FIND_UDPRETRIES 3
113 #define DNS_CLIENTATTR_OWNCTX 0x01
115 #define DNS_CLIENTVIEW_NAME "dnsclient"
118 * Internal state for a single name resolution procedure
120 typedef struct resctx {
124 dns_client_t *client;
125 isc_boolean_t want_dnssec;
128 ISC_LINK(struct resctx) link;
131 unsigned int restarts;
132 dns_fixedname_t name;
133 dns_rdatatype_t type;
135 dns_namelist_t namelist;
137 dns_clientresevent_t *event;
138 isc_boolean_t canceled;
139 dns_rdataset_t *rdataset;
140 dns_rdataset_t *sigrdataset;
144 * Argument of an internal event for synchronous name resolution.
146 typedef struct resarg {
149 dns_client_t *client;
154 isc_result_t vresult;
155 dns_namelist_t *namelist;
156 dns_clientrestrans_t *trans;
157 isc_boolean_t canceled;
161 * Internal state for a single DNS request
163 typedef struct reqctx {
167 dns_client_t *client;
168 unsigned int parseoptions;
171 ISC_LINK(struct reqctx) link;
172 isc_boolean_t canceled;
173 dns_tsigkey_t *tsigkey;
174 dns_request_t *request;
175 dns_clientreqevent_t *event;
179 * Argument of an internal event for synchronous DNS request.
181 typedef struct reqarg {
184 dns_client_t *client;
189 dns_clientreqtrans_t *trans;
190 isc_boolean_t canceled;
194 * Argument of an internal event for synchronous name resolution.
196 typedef struct updatearg {
199 dns_client_t *client;
204 dns_clientupdatetrans_t *trans;
205 isc_boolean_t canceled;
209 * Internal state for a single dynamic update procedure
211 typedef struct updatectx {
215 dns_client_t *client;
218 dns_request_t *updatereq;
219 dns_request_t *soareq;
220 dns_clientrestrans_t *restrans;
221 dns_clientrestrans_t *restrans2;
222 isc_boolean_t canceled;
225 ISC_LINK(struct updatectx) link;
226 dns_clientupdatestate_t state;
227 dns_rdataclass_t rdclass;
229 dns_message_t *updatemsg;
230 dns_message_t *soaquery;
231 dns_clientupdateevent_t *event;
232 dns_tsigkey_t *tsigkey;
234 dns_name_t *firstname;
236 dns_fixedname_t zonefname;
237 dns_name_t *zonename;
238 isc_sockaddrlist_t servers;
239 unsigned int nservers;
240 isc_sockaddr_t *currentserver;
241 struct updatectx *bp4;
242 struct updatectx *bp6;
245 static isc_result_t request_soa(updatectx_t *uctx);
246 static void client_resfind(resctx_t *rctx, dns_fetchevent_t *event);
247 static isc_result_t send_update(updatectx_t *uctx);
250 getudpdispatch(int family, dns_dispatchmgr_t *dispatchmgr,
251 isc_socketmgr_t *socketmgr, isc_taskmgr_t *taskmgr,
252 isc_boolean_t is_shared, dns_dispatch_t **dispp)
254 unsigned int attrs, attrmask;
256 dns_dispatch_t *disp;
257 unsigned buffersize, maxbuffers, maxrequests, buckets, increment;
261 attrs |= DNS_DISPATCHATTR_UDP;
264 attrs |= DNS_DISPATCHATTR_IPV4;
267 attrs |= DNS_DISPATCHATTR_IPV6;
273 attrmask |= DNS_DISPATCHATTR_UDP;
274 attrmask |= DNS_DISPATCHATTR_TCP;
275 attrmask |= DNS_DISPATCHATTR_IPV4;
276 attrmask |= DNS_DISPATCHATTR_IPV6;
278 isc_sockaddr_anyofpf(&sa, family);
281 maxbuffers = is_shared ? 1000 : 8;
283 buckets = is_shared ? 16411 : 3;
284 increment = is_shared ? 16433 : 5;
287 result = dns_dispatch_getudp(dispatchmgr, socketmgr,
289 buffersize, maxbuffers, maxrequests,
291 attrs, attrmask, &disp);
292 if (result == ISC_R_SUCCESS)
299 dns_client_createview(isc_mem_t *mctx, dns_rdataclass_t rdclass,
300 unsigned int options, isc_taskmgr_t *taskmgr,
301 unsigned int ntasks, isc_socketmgr_t *socketmgr,
302 isc_timermgr_t *timermgr, dns_dispatchmgr_t *dispatchmgr,
303 dns_dispatch_t *dispatchv4, dns_dispatch_t *dispatchv6,
307 dns_view_t *view = NULL;
310 result = dns_view_create(mctx, rdclass, DNS_CLIENTVIEW_NAME, &view);
311 if (result != ISC_R_SUCCESS)
314 /* Initialize view security roots */
315 result = dns_view_initsecroots(view, mctx);
316 if (result != ISC_R_SUCCESS) {
317 dns_view_detach(&view);
321 result = dns_view_createresolver(view, taskmgr, ntasks, socketmgr,
322 timermgr, 0, dispatchmgr,
323 dispatchv4, dispatchv6);
324 if (result != ISC_R_SUCCESS) {
325 dns_view_detach(&view);
331 * XXX: it may be better if specific DB implementations can be
332 * specified via some configuration knob.
334 if ((options & DNS_CLIENTCREATEOPT_USECACHE) != 0)
338 result = dns_db_create(mctx, dbtype, dns_rootname, dns_dbtype_cache,
339 rdclass, 0, NULL, &view->cachedb);
340 if (result != ISC_R_SUCCESS) {
341 dns_view_detach(&view);
346 return (ISC_R_SUCCESS);
350 dns_client_create(dns_client_t **clientp, unsigned int options) {
352 isc_mem_t *mctx = NULL;
353 isc_appctx_t *actx = NULL;
354 isc_taskmgr_t *taskmgr = NULL;
355 isc_socketmgr_t *socketmgr = NULL;
356 isc_timermgr_t *timermgr = NULL;
358 result = isc_mem_create(0, 0, &mctx);
359 if (result != ISC_R_SUCCESS)
361 result = isc_appctx_create(mctx, &actx);
362 if (result != ISC_R_SUCCESS)
364 result = isc_app_ctxstart(actx);
365 if (result != ISC_R_SUCCESS)
367 result = isc_taskmgr_createinctx(mctx, actx, 1, 0, &taskmgr);
368 if (result != ISC_R_SUCCESS)
370 result = isc_socketmgr_createinctx(mctx, actx, &socketmgr);
371 if (result != ISC_R_SUCCESS)
373 result = isc_timermgr_createinctx(mctx, actx, &timermgr);
374 if (result != ISC_R_SUCCESS)
377 result = dns_client_createx(mctx, actx, taskmgr, socketmgr, timermgr,
379 if (result != ISC_R_SUCCESS)
382 (*clientp)->attributes |= DNS_CLIENTATTR_OWNCTX;
384 /* client has its own reference to mctx, so we can detach it here */
385 isc_mem_detach(&mctx);
387 return (ISC_R_SUCCESS);
391 isc_taskmgr_destroy(&taskmgr);
392 if (timermgr != NULL)
393 isc_timermgr_destroy(&timermgr);
394 if (socketmgr != NULL)
395 isc_socketmgr_destroy(&socketmgr);
397 isc_appctx_destroy(&actx);
398 isc_mem_detach(&mctx);
404 dns_client_createx(isc_mem_t *mctx, isc_appctx_t *actx, isc_taskmgr_t *taskmgr,
405 isc_socketmgr_t *socketmgr, isc_timermgr_t *timermgr,
406 unsigned int options, dns_client_t **clientp)
408 dns_client_t *client;
410 dns_dispatchmgr_t *dispatchmgr = NULL;
411 dns_dispatch_t *dispatchv4 = NULL;
412 dns_dispatch_t *dispatchv6 = NULL;
413 dns_view_t *view = NULL;
415 REQUIRE(mctx != NULL);
416 REQUIRE(taskmgr != NULL);
417 REQUIRE(timermgr != NULL);
418 REQUIRE(socketmgr != NULL);
419 REQUIRE(clientp != NULL && *clientp == NULL);
421 client = isc_mem_get(mctx, sizeof(*client));
423 return (ISC_R_NOMEMORY);
425 result = isc_mutex_init(&client->lock);
426 if (result != ISC_R_SUCCESS) {
427 isc_mem_put(mctx, client, sizeof(*client));
432 client->taskmgr = taskmgr;
433 client->socketmgr = socketmgr;
434 client->timermgr = timermgr;
437 result = isc_task_create(client->taskmgr, 0, &client->task);
438 if (result != ISC_R_SUCCESS)
441 result = dns_dispatchmgr_create(mctx, NULL, &dispatchmgr);
442 if (result != ISC_R_SUCCESS)
444 client->dispatchmgr = dispatchmgr;
446 /* TODO: whether to use dispatch v4 or v6 should be configurable */
447 client->dispatchv4 = NULL;
448 client->dispatchv6 = NULL;
449 result = getudpdispatch(AF_INET, dispatchmgr, socketmgr,
450 taskmgr, ISC_TRUE, &dispatchv4);
451 if (result == ISC_R_SUCCESS)
452 client->dispatchv4 = dispatchv4;
453 result = getudpdispatch(AF_INET6, dispatchmgr, socketmgr,
454 taskmgr, ISC_TRUE, &dispatchv6);
455 if (result == ISC_R_SUCCESS)
456 client->dispatchv6 = dispatchv6;
458 /* We need at least one of the dispatchers */
459 if (dispatchv4 == NULL && dispatchv6 == NULL) {
460 INSIST(result != ISC_R_SUCCESS);
464 /* Create the default view for class IN */
465 result = dns_client_createview(mctx, dns_rdataclass_in, options,
466 taskmgr, 31, socketmgr, timermgr,
467 dispatchmgr, dispatchv4, dispatchv6,
469 if (result != ISC_R_SUCCESS)
471 ISC_LIST_INIT(client->viewlist);
472 ISC_LIST_APPEND(client->viewlist, view, link);
474 dns_view_freeze(view); /* too early? */
476 ISC_LIST_INIT(client->resctxs);
477 ISC_LIST_INIT(client->reqctxs);
478 ISC_LIST_INIT(client->updatectxs);
481 isc_mem_attach(mctx, &client->mctx);
483 client->update_timeout = DEF_UPDATE_TIMEOUT;
484 client->update_udptimeout = DEF_UPDATE_UDPTIMEOUT;
485 client->update_udpretries = DEF_UPDATE_UDPRETRIES;
486 client->find_timeout = DEF_FIND_TIMEOUT;
487 client->find_udpretries = DEF_FIND_UDPRETRIES;
489 client->references = 1;
490 client->magic = DNS_CLIENT_MAGIC;
494 return (ISC_R_SUCCESS);
497 if (dispatchv4 != NULL)
498 dns_dispatch_detach(&dispatchv4);
499 if (dispatchv6 != NULL)
500 dns_dispatch_detach(&dispatchv6);
501 if (dispatchmgr != NULL)
502 dns_dispatchmgr_destroy(&dispatchmgr);
503 if (client->task != NULL)
504 isc_task_detach(&client->task);
505 isc_mem_put(mctx, client, sizeof(*client));
511 destroyclient(dns_client_t **clientp) {
512 dns_client_t *client = *clientp;
515 while ((view = ISC_LIST_HEAD(client->viewlist)) != NULL) {
516 ISC_LIST_UNLINK(client->viewlist, view, link);
517 dns_view_detach(&view);
520 if (client->dispatchv4 != NULL)
521 dns_dispatch_detach(&client->dispatchv4);
522 if (client->dispatchv6 != NULL)
523 dns_dispatch_detach(&client->dispatchv6);
525 dns_dispatchmgr_destroy(&client->dispatchmgr);
527 isc_task_detach(&client->task);
530 * If the client has created its own running environments,
533 if ((client->attributes & DNS_CLIENTATTR_OWNCTX) != 0) {
534 isc_taskmgr_destroy(&client->taskmgr);
535 isc_timermgr_destroy(&client->timermgr);
536 isc_socketmgr_destroy(&client->socketmgr);
538 isc_app_ctxfinish(client->actx);
539 isc_appctx_destroy(&client->actx);
542 DESTROYLOCK(&client->lock);
545 isc_mem_putanddetach(&client->mctx, client, sizeof(*client));
551 dns_client_destroy(dns_client_t **clientp) {
552 dns_client_t *client;
553 isc_boolean_t destroyok = ISC_FALSE;
555 REQUIRE(clientp != NULL);
557 REQUIRE(DNS_CLIENT_VALID(client));
560 client->references--;
561 if (client->references == 0 && ISC_LIST_EMPTY(client->resctxs) &&
562 ISC_LIST_EMPTY(client->reqctxs) &&
563 ISC_LIST_EMPTY(client->updatectxs)) {
564 destroyok = ISC_TRUE;
566 UNLOCK(&client->lock);
569 destroyclient(&client);
575 dns_client_setservers(dns_client_t *client, dns_rdataclass_t rdclass,
576 dns_name_t *namespace, isc_sockaddrlist_t *addrs)
579 dns_view_t *view = NULL;
581 REQUIRE(DNS_CLIENT_VALID(client));
582 REQUIRE(addrs != NULL);
584 if (namespace == NULL)
585 namespace = dns_rootname;
588 result = dns_viewlist_find(&client->viewlist, DNS_CLIENTVIEW_NAME,
590 if (result != ISC_R_SUCCESS) {
591 UNLOCK(&client->lock);
594 UNLOCK(&client->lock);
596 result = dns_fwdtable_add(view->fwdtable, namespace, addrs,
599 dns_view_detach(&view);
605 dns_client_clearservers(dns_client_t *client, dns_rdataclass_t rdclass,
606 dns_name_t *namespace)
609 dns_view_t *view = NULL;
611 REQUIRE(DNS_CLIENT_VALID(client));
613 if (namespace == NULL)
614 namespace = dns_rootname;
617 result = dns_viewlist_find(&client->viewlist, DNS_CLIENTVIEW_NAME,
619 if (result != ISC_R_SUCCESS) {
620 UNLOCK(&client->lock);
623 UNLOCK(&client->lock);
625 result = dns_fwdtable_delete(view->fwdtable, namespace);
627 dns_view_detach(&view);
633 getrdataset(isc_mem_t *mctx, dns_rdataset_t **rdatasetp) {
634 dns_rdataset_t *rdataset;
636 REQUIRE(mctx != NULL);
637 REQUIRE(rdatasetp != NULL && *rdatasetp == NULL);
639 rdataset = isc_mem_get(mctx, sizeof(*rdataset));
640 if (rdataset == NULL)
641 return (ISC_R_NOMEMORY);
643 dns_rdataset_init(rdataset);
645 *rdatasetp = rdataset;
647 return (ISC_R_SUCCESS);
651 putrdataset(isc_mem_t *mctx, dns_rdataset_t **rdatasetp) {
652 dns_rdataset_t *rdataset;
654 REQUIRE(rdatasetp != NULL);
655 rdataset = *rdatasetp;
656 REQUIRE(rdataset != NULL);
658 if (dns_rdataset_isassociated(rdataset))
659 dns_rdataset_disassociate(rdataset);
661 isc_mem_put(mctx, rdataset, sizeof(*rdataset));
667 fetch_done(isc_task_t *task, isc_event_t *event) {
668 resctx_t *rctx = event->ev_arg;
669 dns_fetchevent_t *fevent;
671 REQUIRE(event->ev_type == DNS_EVENT_FETCHDONE);
672 REQUIRE(RCTX_VALID(rctx));
673 REQUIRE(rctx->task == task);
674 fevent = (dns_fetchevent_t *)event;
676 client_resfind(rctx, fevent);
679 static inline isc_result_t
680 start_fetch(resctx_t *rctx) {
684 * The caller must be holding the rctx's lock.
687 REQUIRE(rctx->fetch == NULL);
689 result = dns_resolver_createfetch(rctx->view->resolver,
690 dns_fixedname_name(&rctx->name),
693 rctx->task, fetch_done, rctx,
702 view_find(resctx_t *rctx, dns_db_t **dbp, dns_dbnode_t **nodep,
703 dns_name_t *foundname)
706 dns_name_t *name = dns_fixedname_name(&rctx->name);
707 dns_rdatatype_t type;
709 if (rctx->type == dns_rdatatype_rrsig)
710 type = dns_rdatatype_any;
714 result = dns_view_find(rctx->view, name, type, 0, 0, ISC_FALSE,
715 dbp, nodep, foundname, rctx->rdataset,
722 client_resfind(resctx_t *rctx, dns_fetchevent_t *event) {
724 isc_result_t tresult, result = ISC_R_SUCCESS;
725 isc_result_t vresult = ISC_R_SUCCESS;
726 isc_boolean_t want_restart;
727 isc_boolean_t send_event = ISC_FALSE;
728 dns_name_t *name, *prefix;
729 dns_fixedname_t foundname, fixed;
730 dns_rdataset_t *trdataset;
731 dns_rdata_t rdata = DNS_RDATA_INIT;
732 unsigned int nlabels;
734 dns_namereln_t namereln;
735 dns_rdata_cname_t cname;
736 dns_rdata_dname_t dname;
738 REQUIRE(RCTX_VALID(rctx));
742 mctx = rctx->view->mctx;
744 name = dns_fixedname_name(&rctx->name);
747 dns_name_t *fname = NULL;
748 dns_name_t *ansname = NULL;
750 dns_dbnode_t *node = NULL;
753 want_restart = ISC_FALSE;
755 if (event == NULL && !rctx->canceled) {
756 dns_fixedname_init(&foundname);
757 fname = dns_fixedname_name(&foundname);
758 INSIST(!dns_rdataset_isassociated(rctx->rdataset));
759 INSIST(rctx->sigrdataset == NULL ||
760 !dns_rdataset_isassociated(rctx->sigrdataset));
761 result = view_find(rctx, &db, &node, fname);
762 if (result == ISC_R_NOTFOUND) {
764 * We don't know anything about the name.
769 dns_db_detachnode(db, &node);
773 result = start_fetch(rctx);
774 if (result != ISC_R_SUCCESS) {
775 putrdataset(mctx, &rctx->rdataset);
776 if (rctx->sigrdataset != NULL)
779 send_event = ISC_TRUE;
784 INSIST(event != NULL);
785 INSIST(event->fetch == rctx->fetch);
786 dns_resolver_destroyfetch(&rctx->fetch);
789 result = event->result;
790 vresult = event->vresult;
791 fname = dns_fixedname_name(&event->foundname);
792 INSIST(event->rdataset == rctx->rdataset);
793 INSIST(event->sigrdataset == rctx->sigrdataset);
797 * If we've been canceled, forget about the result.
800 result = ISC_R_CANCELED;
803 * Otherwise, get some resource for copying the
806 ansname = isc_mem_get(mctx, sizeof(*ansname));
808 tresult = ISC_R_NOMEMORY;
812 aname = dns_fixedname_name(&rctx->name);
813 dns_name_init(ansname, NULL);
814 tresult = dns_name_dup(aname, mctx, ansname);
815 if (tresult != ISC_R_SUCCESS)
816 isc_mem_put(mctx, ansname,
819 if (tresult != ISC_R_SUCCESS)
825 send_event = ISC_TRUE;
827 * This case is handled in the main line below.
832 * Add the CNAME to the answer list.
834 trdataset = rctx->rdataset;
835 ISC_LIST_APPEND(ansname->list, rctx->rdataset, link);
836 rctx->rdataset = NULL;
837 if (rctx->sigrdataset != NULL) {
838 ISC_LIST_APPEND(ansname->list,
839 rctx->sigrdataset, link);
840 rctx->sigrdataset = NULL;
842 ISC_LIST_APPEND(rctx->namelist, ansname, link);
846 * Copy the CNAME's target into the lookup's
847 * query name and start over.
849 tresult = dns_rdataset_first(trdataset);
850 if (tresult != ISC_R_SUCCESS)
852 dns_rdataset_current(trdataset, &rdata);
853 tresult = dns_rdata_tostruct(&rdata, &cname, NULL);
854 dns_rdata_reset(&rdata);
855 if (tresult != ISC_R_SUCCESS)
857 tresult = dns_name_copy(&cname.cname, name, NULL);
858 dns_rdata_freestruct(&cname);
859 if (tresult == ISC_R_SUCCESS)
860 want_restart = ISC_TRUE;
866 * Add the DNAME to the answer list.
868 trdataset = rctx->rdataset;
869 ISC_LIST_APPEND(ansname->list, rctx->rdataset, link);
870 rctx->rdataset = NULL;
871 if (rctx->sigrdataset != NULL) {
872 ISC_LIST_APPEND(ansname->list,
873 rctx->sigrdataset, link);
874 rctx->sigrdataset = NULL;
876 ISC_LIST_APPEND(rctx->namelist, ansname, link);
879 namereln = dns_name_fullcompare(name, fname, &order,
881 INSIST(namereln == dns_namereln_subdomain);
883 * Get the target name of the DNAME.
885 tresult = dns_rdataset_first(trdataset);
886 if (tresult != ISC_R_SUCCESS) {
890 dns_rdataset_current(trdataset, &rdata);
891 tresult = dns_rdata_tostruct(&rdata, &dname, NULL);
892 dns_rdata_reset(&rdata);
893 if (tresult != ISC_R_SUCCESS) {
898 * Construct the new query name and start over.
900 dns_fixedname_init(&fixed);
901 prefix = dns_fixedname_name(&fixed);
902 dns_name_split(name, nlabels, prefix, NULL);
903 tresult = dns_name_concatenate(prefix, &dname.dname,
905 dns_rdata_freestruct(&dname);
906 if (tresult == ISC_R_SUCCESS)
907 want_restart = ISC_TRUE;
911 case DNS_R_NCACHENXDOMAIN:
912 case DNS_R_NCACHENXRRSET:
913 ISC_LIST_APPEND(ansname->list, rctx->rdataset, link);
914 ISC_LIST_APPEND(rctx->namelist, ansname, link);
916 rctx->rdataset = NULL;
917 /* What about sigrdataset? */
918 if (rctx->sigrdataset != NULL)
919 putrdataset(mctx, &rctx->sigrdataset);
920 send_event = ISC_TRUE;
923 if (rctx->rdataset != NULL)
924 putrdataset(mctx, &rctx->rdataset);
925 if (rctx->sigrdataset != NULL)
926 putrdataset(mctx, &rctx->sigrdataset);
927 send_event = ISC_TRUE;
931 if (rctx->type == dns_rdatatype_any) {
933 dns_rdatasetiter_t *rdsiter = NULL;
935 tresult = dns_db_allrdatasets(db, node, NULL, 0,
937 if (tresult != ISC_R_SUCCESS) {
942 tresult = dns_rdatasetiter_first(rdsiter);
943 while (tresult == ISC_R_SUCCESS) {
944 dns_rdatasetiter_current(rdsiter,
946 if (rctx->rdataset->type != 0) {
947 ISC_LIST_APPEND(ansname->list,
951 rctx->rdataset = NULL;
954 * We're not interested in this
957 dns_rdataset_disassociate(
960 tresult = dns_rdatasetiter_next(rdsiter);
962 if (tresult == ISC_R_SUCCESS &&
963 rctx->rdataset == NULL) {
964 tresult = getrdataset(mctx,
966 if (tresult != ISC_R_SUCCESS) {
975 * We didn't match any rdatasets (which means
976 * something went wrong in this
979 result = DNS_R_SERVFAIL; /* better code? */
982 ISC_LIST_APPEND(rctx->namelist, ansname, link);
985 dns_rdatasetiter_destroy(&rdsiter);
986 if (tresult != ISC_R_NOMORE)
987 result = DNS_R_SERVFAIL; /* ditto */
989 result = ISC_R_SUCCESS;
993 * This is the "normal" case -- an ordinary question
994 * to which we've got the answer.
996 ISC_LIST_APPEND(ansname->list, rctx->rdataset, link);
997 rctx->rdataset = NULL;
998 if (rctx->sigrdataset != NULL) {
999 ISC_LIST_APPEND(ansname->list,
1000 rctx->sigrdataset, link);
1001 rctx->sigrdataset = NULL;
1003 ISC_LIST_APPEND(rctx->namelist, ansname, link);
1009 * Free temporary resources
1011 if (ansname != NULL) {
1012 dns_rdataset_t *rdataset;
1014 while ((rdataset = ISC_LIST_HEAD(ansname->list))
1016 ISC_LIST_UNLINK(ansname->list, rdataset, link);
1017 putrdataset(mctx, &rdataset);
1019 dns_name_free(ansname, mctx);
1020 isc_mem_put(mctx, ansname, sizeof(*ansname));
1024 dns_db_detachnode(db, &node);
1028 isc_event_free(ISC_EVENT_PTR(&event));
1031 * Limit the number of restarts.
1033 if (want_restart && rctx->restarts == MAX_RESTARTS) {
1034 want_restart = ISC_FALSE;
1035 result = ISC_R_QUOTA;
1036 send_event = ISC_TRUE;
1040 * Prepare further find with new resources
1043 INSIST(rctx->rdataset == NULL &&
1044 rctx->sigrdataset == NULL);
1046 result = getrdataset(mctx, &rctx->rdataset);
1047 if (result == ISC_R_SUCCESS && rctx->want_dnssec) {
1048 result = getrdataset(mctx, &rctx->sigrdataset);
1049 if (result != ISC_R_SUCCESS) {
1050 putrdataset(mctx, &rctx->rdataset);
1054 if (result != ISC_R_SUCCESS) {
1055 want_restart = ISC_FALSE;
1056 send_event = ISC_TRUE;
1059 } while (want_restart);
1064 while ((name = ISC_LIST_HEAD(rctx->namelist)) != NULL) {
1065 ISC_LIST_UNLINK(rctx->namelist, name, link);
1066 ISC_LIST_APPEND(rctx->event->answerlist, name, link);
1069 rctx->event->result = result;
1070 rctx->event->vresult = vresult;
1071 task = rctx->event->ev_sender;
1072 rctx->event->ev_sender = rctx;
1073 isc_task_sendanddetach(&task, ISC_EVENT_PTR(&rctx->event));
1076 UNLOCK(&rctx->lock);
1080 resolve_done(isc_task_t *task, isc_event_t *event) {
1081 resarg_t *resarg = event->ev_arg;
1082 dns_clientresevent_t *rev = (dns_clientresevent_t *)event;
1087 LOCK(&resarg->lock);
1089 resarg->result = rev->result;
1090 resarg->vresult = rev->vresult;
1091 while ((name = ISC_LIST_HEAD(rev->answerlist)) != NULL) {
1092 ISC_LIST_UNLINK(rev->answerlist, name, link);
1093 ISC_LIST_APPEND(*resarg->namelist, name, link);
1096 dns_client_destroyrestrans(&resarg->trans);
1097 isc_event_free(&event);
1099 if (!resarg->canceled) {
1100 UNLOCK(&resarg->lock);
1102 /* Exit from the internal event loop */
1103 isc_app_ctxsuspend(resarg->actx);
1106 * We have already exited from the loop (due to some
1107 * unexpected event). Just clean the arg up.
1109 UNLOCK(&resarg->lock);
1110 DESTROYLOCK(&resarg->lock);
1111 isc_mem_put(resarg->client->mctx, resarg, sizeof(*resarg));
1116 dns_client_resolve(dns_client_t *client, dns_name_t *name,
1117 dns_rdataclass_t rdclass, dns_rdatatype_t type,
1118 unsigned int options, dns_namelist_t *namelist)
1120 isc_result_t result;
1124 REQUIRE(DNS_CLIENT_VALID(client));
1125 REQUIRE(namelist != NULL && ISC_LIST_EMPTY(*namelist));
1127 if ((client->attributes & DNS_CLIENTATTR_OWNCTX) == 0 &&
1128 (options & DNS_CLIENTRESOPT_ALLOWRUN) == 0) {
1130 * If the client is run under application's control, we need
1131 * to create a new running (sub)environment for this
1132 * particular resolution.
1134 return (ISC_R_NOTIMPLEMENTED); /* XXXTBD */
1136 actx = client->actx;
1138 resarg = isc_mem_get(client->mctx, sizeof(*resarg));
1140 return (ISC_R_NOMEMORY);
1142 result = isc_mutex_init(&resarg->lock);
1143 if (result != ISC_R_SUCCESS) {
1144 isc_mem_put(client->mctx, resarg, sizeof(*resarg));
1148 resarg->actx = actx;
1149 resarg->client = client;
1150 resarg->result = DNS_R_SERVFAIL;
1151 resarg->namelist = namelist;
1152 resarg->trans = NULL;
1153 resarg->canceled = ISC_FALSE;
1154 result = dns_client_startresolve(client, name, rdclass, type, options,
1155 client->task, resolve_done, resarg,
1157 if (result != ISC_R_SUCCESS) {
1158 DESTROYLOCK(&resarg->lock);
1159 isc_mem_put(client->mctx, resarg, sizeof(*resarg));
1164 * Start internal event loop. It blocks until the entire process
1167 result = isc_app_ctxrun(actx);
1169 LOCK(&resarg->lock);
1170 if (result == ISC_R_SUCCESS || result == ISC_R_SUSPEND)
1171 result = resarg->result;
1172 if (result != ISC_R_SUCCESS && resarg->vresult != ISC_R_SUCCESS) {
1174 * If this lookup failed due to some error in DNSSEC
1175 * validation, return the validation error code.
1176 * XXX: or should we pass the validation result separately?
1178 result = resarg->vresult;
1180 if (resarg->trans != NULL) {
1182 * Unusual termination (perhaps due to signal). We need some
1183 * tricky cleanup process.
1185 resarg->canceled = ISC_TRUE;
1186 dns_client_cancelresolve(resarg->trans);
1188 UNLOCK(&resarg->lock);
1190 /* resarg will be freed in the event handler. */
1192 UNLOCK(&resarg->lock);
1194 DESTROYLOCK(&resarg->lock);
1195 isc_mem_put(client->mctx, resarg, sizeof(*resarg));
1202 dns_client_startresolve(dns_client_t *client, dns_name_t *name,
1203 dns_rdataclass_t rdclass, dns_rdatatype_t type,
1204 unsigned int options, isc_task_t *task,
1205 isc_taskaction_t action, void *arg,
1206 dns_clientrestrans_t **transp)
1208 dns_view_t *view = NULL;
1209 dns_clientresevent_t *event = NULL;
1210 resctx_t *rctx = NULL;
1211 isc_task_t *clone = NULL;
1213 isc_result_t result;
1214 dns_rdataset_t *rdataset, *sigrdataset;
1215 isc_boolean_t want_dnssec;
1217 REQUIRE(DNS_CLIENT_VALID(client));
1218 REQUIRE(transp != NULL && *transp == NULL);
1220 LOCK(&client->lock);
1221 result = dns_viewlist_find(&client->viewlist, DNS_CLIENTVIEW_NAME,
1223 UNLOCK(&client->lock);
1224 if (result != ISC_R_SUCCESS)
1227 mctx = client->mctx;
1230 want_dnssec = ISC_TF((options & DNS_CLIENTRESOPT_NODNSSEC) == 0);
1233 * Prepare some intermediate resources
1236 isc_task_attach(task, &clone);
1237 event = (dns_clientresevent_t *)
1238 isc_event_allocate(mctx, clone, DNS_EVENT_CLIENTRESDONE,
1239 action, arg, sizeof(*event));
1240 if (event == NULL) {
1241 result = ISC_R_NOMEMORY;
1244 event->result = DNS_R_SERVFAIL;
1245 ISC_LIST_INIT(event->answerlist);
1247 rctx = isc_mem_get(mctx, sizeof(*rctx));
1249 result = ISC_R_NOMEMORY;
1251 result = isc_mutex_init(&rctx->lock);
1252 if (result != ISC_R_SUCCESS) {
1253 isc_mem_put(mctx, rctx, sizeof(*rctx));
1257 if (result != ISC_R_SUCCESS)
1260 result = getrdataset(mctx, &rdataset);
1261 if (result != ISC_R_SUCCESS)
1263 rctx->rdataset = rdataset;
1266 result = getrdataset(mctx, &sigrdataset);
1267 if (result != ISC_R_SUCCESS)
1270 rctx->sigrdataset = sigrdataset;
1272 dns_fixedname_init(&rctx->name);
1273 result = dns_name_copy(name, dns_fixedname_name(&rctx->name), NULL);
1274 if (result != ISC_R_SUCCESS)
1277 rctx->client = client;
1278 ISC_LINK_INIT(rctx, link);
1279 rctx->canceled = ISC_FALSE;
1280 rctx->task = client->task;
1285 rctx->want_dnssec = want_dnssec;
1286 ISC_LIST_INIT(rctx->namelist);
1287 rctx->event = event;
1289 rctx->magic = RCTX_MAGIC;
1291 LOCK(&client->lock);
1292 ISC_LIST_APPEND(client->resctxs, rctx, link);
1293 UNLOCK(&client->lock);
1295 client_resfind(rctx, NULL);
1297 *transp = (dns_clientrestrans_t *)rctx;
1299 return (ISC_R_SUCCESS);
1302 if (rdataset != NULL)
1303 putrdataset(client->mctx, &rdataset);
1304 if (sigrdataset != NULL)
1305 putrdataset(client->mctx, &sigrdataset);
1307 DESTROYLOCK(&rctx->lock);
1308 isc_mem_put(mctx, rctx, sizeof(*rctx));
1311 isc_event_free(ISC_EVENT_PTR(&event));
1312 isc_task_detach(&clone);
1313 dns_view_detach(&view);
1319 dns_client_cancelresolve(dns_clientrestrans_t *trans) {
1322 REQUIRE(trans != NULL);
1323 rctx = (resctx_t *)trans;
1324 REQUIRE(RCTX_VALID(rctx));
1328 if (!rctx->canceled) {
1329 rctx->canceled = ISC_TRUE;
1330 if (rctx->fetch != NULL)
1331 dns_resolver_cancelfetch(rctx->fetch);
1334 UNLOCK(&rctx->lock);
1338 dns_client_freeresanswer(dns_client_t *client, dns_namelist_t *namelist) {
1340 dns_rdataset_t *rdataset;
1342 REQUIRE(DNS_CLIENT_VALID(client));
1343 REQUIRE(namelist != NULL);
1345 while ((name = ISC_LIST_HEAD(*namelist)) != NULL) {
1346 ISC_LIST_UNLINK(*namelist, name, link);
1347 while ((rdataset = ISC_LIST_HEAD(name->list)) != NULL) {
1348 ISC_LIST_UNLINK(name->list, rdataset, link);
1349 putrdataset(client->mctx, &rdataset);
1351 dns_name_free(name, client->mctx);
1352 isc_mem_put(client->mctx, name, sizeof(*name));
1357 dns_client_destroyrestrans(dns_clientrestrans_t **transp) {
1360 dns_client_t *client;
1361 isc_boolean_t need_destroyclient = ISC_FALSE;
1363 REQUIRE(transp != NULL);
1364 rctx = (resctx_t *)*transp;
1365 REQUIRE(RCTX_VALID(rctx));
1366 REQUIRE(rctx->fetch == NULL);
1367 REQUIRE(rctx->event == NULL);
1368 client = rctx->client;
1369 REQUIRE(DNS_CLIENT_VALID(client));
1371 mctx = client->mctx;
1372 dns_view_detach(&rctx->view);
1374 LOCK(&client->lock);
1376 INSIST(ISC_LINK_LINKED(rctx, link));
1377 ISC_LIST_UNLINK(client->resctxs, rctx, link);
1379 if (client->references == 0 && ISC_LIST_EMPTY(client->resctxs) &&
1380 ISC_LIST_EMPTY(client->reqctxs) &&
1381 ISC_LIST_EMPTY(client->updatectxs))
1382 need_destroyclient = ISC_TRUE;
1384 UNLOCK(&client->lock);
1386 INSIST(ISC_LIST_EMPTY(rctx->namelist));
1388 DESTROYLOCK(&rctx->lock);
1391 isc_mem_put(mctx, rctx, sizeof(*rctx));
1393 if (need_destroyclient)
1394 destroyclient(&client);
1400 dns_client_addtrustedkey(dns_client_t *client, dns_rdataclass_t rdclass,
1401 dns_name_t *keyname, isc_buffer_t *keydatabuf)
1403 isc_result_t result;
1404 dns_view_t *view = NULL;
1405 dst_key_t *dstkey = NULL;
1406 dns_keytable_t *secroots = NULL;
1408 REQUIRE(DNS_CLIENT_VALID(client));
1410 LOCK(&client->lock);
1411 result = dns_viewlist_find(&client->viewlist, DNS_CLIENTVIEW_NAME,
1413 UNLOCK(&client->lock);
1414 if (result != ISC_R_SUCCESS)
1417 result = dns_view_getsecroots(view, &secroots);
1418 if (result != ISC_R_SUCCESS)
1421 result = dst_key_fromdns(keyname, rdclass, keydatabuf, client->mctx,
1423 if (result != ISC_R_SUCCESS)
1426 result = dns_keytable_add(secroots, ISC_FALSE, &dstkey);
1430 dst_key_free(&dstkey);
1432 dns_view_detach(&view);
1433 if (secroots != NULL)
1434 dns_keytable_detach(&secroots);
1439 * Simple request routines
1442 request_done(isc_task_t *task, isc_event_t *event) {
1443 dns_requestevent_t *reqev = NULL;
1444 dns_request_t *request;
1445 isc_result_t result, eresult;
1450 REQUIRE(event->ev_type == DNS_EVENT_REQUESTDONE);
1451 reqev = (dns_requestevent_t *)event;
1452 request = reqev->request;
1453 result = eresult = reqev->result;
1454 ctx = reqev->ev_arg;
1455 REQUIRE(REQCTX_VALID(ctx));
1457 isc_event_free(&event);
1461 if (eresult == ISC_R_SUCCESS) {
1462 result = dns_request_getresponse(request, ctx->event->rmessage,
1466 if (ctx->tsigkey != NULL)
1467 dns_tsigkey_detach(&ctx->tsigkey);
1470 ctx->event->result = ISC_R_CANCELED;
1472 ctx->event->result = result;
1473 task = ctx->event->ev_sender;
1474 ctx->event->ev_sender = ctx;
1475 isc_task_sendanddetach(&task, ISC_EVENT_PTR(&ctx->event));
1481 localrequest_done(isc_task_t *task, isc_event_t *event) {
1482 reqarg_t *reqarg = event->ev_arg;
1483 dns_clientreqevent_t *rev =(dns_clientreqevent_t *)event;
1487 REQUIRE(event->ev_type == DNS_EVENT_CLIENTREQDONE);
1489 LOCK(&reqarg->lock);
1491 reqarg->result = rev->result;
1492 dns_client_destroyreqtrans(&reqarg->trans);
1493 isc_event_free(&event);
1495 if (!reqarg->canceled) {
1496 UNLOCK(&reqarg->lock);
1498 /* Exit from the internal event loop */
1499 isc_app_ctxsuspend(reqarg->actx);
1502 * We have already exited from the loop (due to some
1503 * unexpected event). Just clean the arg up.
1505 UNLOCK(&reqarg->lock);
1506 DESTROYLOCK(&reqarg->lock);
1507 isc_mem_put(reqarg->client->mctx, reqarg, sizeof(*reqarg));
1512 dns_client_request(dns_client_t *client, dns_message_t *qmessage,
1513 dns_message_t *rmessage, isc_sockaddr_t *server,
1514 unsigned int options, unsigned int parseoptions,
1515 dns_tsec_t *tsec, unsigned int timeout,
1516 unsigned int udptimeout, unsigned int udpretries)
1520 isc_result_t result;
1522 REQUIRE(DNS_CLIENT_VALID(client));
1523 REQUIRE(qmessage != NULL);
1524 REQUIRE(rmessage != NULL);
1526 if ((client->attributes & DNS_CLIENTATTR_OWNCTX) == 0 &&
1527 (options & DNS_CLIENTREQOPT_ALLOWRUN) == 0) {
1529 * If the client is run under application's control, we need
1530 * to create a new running (sub)environment for this
1531 * particular resolution.
1533 return (ISC_R_NOTIMPLEMENTED); /* XXXTBD */
1535 actx = client->actx;
1537 reqarg = isc_mem_get(client->mctx, sizeof(*reqarg));
1539 return (ISC_R_NOMEMORY);
1541 result = isc_mutex_init(&reqarg->lock);
1542 if (result != ISC_R_SUCCESS) {
1543 isc_mem_put(client->mctx, reqarg, sizeof(*reqarg));
1547 reqarg->actx = actx;
1548 reqarg->client = client;
1549 reqarg->trans = NULL;
1550 reqarg->canceled = ISC_FALSE;
1552 result = dns_client_startrequest(client, qmessage, rmessage, server,
1553 options, parseoptions, tsec, timeout,
1554 udptimeout, udpretries,
1555 client->task, localrequest_done,
1556 reqarg, &reqarg->trans);
1557 if (result != ISC_R_SUCCESS) {
1558 DESTROYLOCK(&reqarg->lock);
1559 isc_mem_put(client->mctx, reqarg, sizeof(*reqarg));
1564 * Start internal event loop. It blocks until the entire process
1567 result = isc_app_ctxrun(actx);
1569 LOCK(&reqarg->lock);
1570 if (result == ISC_R_SUCCESS || result == ISC_R_SUSPEND)
1571 result = reqarg->result;
1572 if (reqarg->trans != NULL) {
1574 * Unusual termination (perhaps due to signal). We need some
1575 * tricky cleanup process.
1577 reqarg->canceled = ISC_TRUE;
1578 dns_client_cancelresolve(reqarg->trans);
1580 UNLOCK(&reqarg->lock);
1582 /* reqarg will be freed in the event handler. */
1584 UNLOCK(&reqarg->lock);
1586 DESTROYLOCK(&reqarg->lock);
1587 isc_mem_put(client->mctx, reqarg, sizeof(*reqarg));
1594 dns_client_startrequest(dns_client_t *client, dns_message_t *qmessage,
1595 dns_message_t *rmessage, isc_sockaddr_t *server,
1596 unsigned int options, unsigned int parseoptions,
1597 dns_tsec_t *tsec, unsigned int timeout,
1598 unsigned int udptimeout, unsigned int udpretries,
1599 isc_task_t *task, isc_taskaction_t action, void *arg,
1600 dns_clientreqtrans_t **transp)
1602 isc_result_t result;
1603 dns_view_t *view = NULL;
1604 isc_task_t *clone = NULL;
1605 dns_clientreqevent_t *event = NULL;
1606 reqctx_t *ctx = NULL;
1607 dns_tsectype_t tsectype = dns_tsectype_none;
1611 REQUIRE(DNS_CLIENT_VALID(client));
1612 REQUIRE(qmessage != NULL);
1613 REQUIRE(rmessage != NULL);
1614 REQUIRE(transp != NULL && *transp == NULL);
1617 tsectype = dns_tsec_gettype(tsec);
1618 if (tsectype != dns_tsectype_tsig)
1619 return (ISC_R_NOTIMPLEMENTED); /* XXX */
1622 LOCK(&client->lock);
1623 result = dns_viewlist_find(&client->viewlist, DNS_CLIENTVIEW_NAME,
1624 qmessage->rdclass, &view);
1625 UNLOCK(&client->lock);
1626 if (result != ISC_R_SUCCESS)
1630 isc_task_attach(task, &clone);
1631 event = (dns_clientreqevent_t *)
1632 isc_event_allocate(client->mctx, clone,
1633 DNS_EVENT_CLIENTREQDONE,
1634 action, arg, sizeof(*event));
1635 if (event == NULL) {
1636 result = ISC_R_NOMEMORY;
1640 ctx = isc_mem_get(client->mctx, sizeof(*ctx));
1642 result = ISC_R_NOMEMORY;
1644 result = isc_mutex_init(&ctx->lock);
1645 if (result != ISC_R_SUCCESS) {
1646 isc_mem_put(client->mctx, ctx, sizeof(*ctx));
1650 if (result != ISC_R_SUCCESS)
1653 ctx->client = client;
1654 ISC_LINK_INIT(ctx, link);
1655 ctx->parseoptions = parseoptions;
1656 ctx->canceled = ISC_FALSE;
1658 ctx->event->rmessage = rmessage;
1659 ctx->tsigkey = NULL;
1661 dns_tsec_getkey(tsec, &ctx->tsigkey);
1663 ctx->magic = REQCTX_MAGIC;
1665 LOCK(&client->lock);
1666 ISC_LIST_APPEND(client->reqctxs, ctx, link);
1667 UNLOCK(&client->lock);
1669 ctx->request = NULL;
1670 result = dns_request_createvia3(view->requestmgr, qmessage, NULL,
1671 server, options, ctx->tsigkey,
1672 timeout, udptimeout, udpretries,
1673 client->task, request_done, ctx,
1675 if (result == ISC_R_SUCCESS) {
1676 dns_view_detach(&view);
1677 *transp = (dns_clientreqtrans_t *)ctx;
1678 return (ISC_R_SUCCESS);
1683 LOCK(&client->lock);
1684 ISC_LIST_UNLINK(client->reqctxs, ctx, link);
1685 UNLOCK(&client->lock);
1686 DESTROYLOCK(&ctx->lock);
1687 isc_mem_put(client->mctx, ctx, sizeof(*ctx));
1690 isc_event_free(ISC_EVENT_PTR(&event));
1691 isc_task_detach(&clone);
1692 dns_view_detach(&view);
1698 dns_client_cancelrequest(dns_clientreqtrans_t *trans) {
1701 REQUIRE(trans != NULL);
1702 ctx = (reqctx_t *)trans;
1703 REQUIRE(REQCTX_VALID(ctx));
1707 if (!ctx->canceled) {
1708 ctx->canceled = ISC_TRUE;
1709 if (ctx->request != NULL)
1710 dns_request_cancel(ctx->request);
1717 dns_client_destroyreqtrans(dns_clientreqtrans_t **transp) {
1720 dns_client_t *client;
1721 isc_boolean_t need_destroyclient = ISC_FALSE;
1723 REQUIRE(transp != NULL);
1724 ctx = (reqctx_t *)*transp;
1725 REQUIRE(REQCTX_VALID(ctx));
1726 client = ctx->client;
1727 REQUIRE(DNS_CLIENT_VALID(client));
1728 REQUIRE(ctx->event == NULL);
1729 REQUIRE(ctx->request != NULL);
1731 dns_request_destroy(&ctx->request);
1732 mctx = client->mctx;
1734 LOCK(&client->lock);
1736 INSIST(ISC_LINK_LINKED(ctx, link));
1737 ISC_LIST_UNLINK(client->reqctxs, ctx, link);
1739 if (client->references == 0 && ISC_LIST_EMPTY(client->resctxs) &&
1740 ISC_LIST_EMPTY(client->reqctxs) &&
1741 ISC_LIST_EMPTY(client->updatectxs)) {
1742 need_destroyclient = ISC_TRUE;
1745 UNLOCK(&client->lock);
1747 DESTROYLOCK(&ctx->lock);
1750 isc_mem_put(mctx, ctx, sizeof(*ctx));
1752 if (need_destroyclient)
1753 destroyclient(&client);
1759 * Dynamic update routines
1762 rcode2result(dns_rcode_t rcode) {
1763 /* XXX: isn't there a similar function? */
1765 case dns_rcode_formerr:
1766 return (DNS_R_FORMERR);
1767 case dns_rcode_servfail:
1768 return (DNS_R_SERVFAIL);
1769 case dns_rcode_nxdomain:
1770 return (DNS_R_NXDOMAIN);
1771 case dns_rcode_notimp:
1772 return (DNS_R_NOTIMP);
1773 case dns_rcode_refused:
1774 return (DNS_R_REFUSED);
1775 case dns_rcode_yxdomain:
1776 return (DNS_R_YXDOMAIN);
1777 case dns_rcode_yxrrset:
1778 return (DNS_R_YXRRSET);
1779 case dns_rcode_nxrrset:
1780 return (DNS_R_NXRRSET);
1781 case dns_rcode_notauth:
1782 return (DNS_R_NOTAUTH);
1783 case dns_rcode_notzone:
1784 return (DNS_R_NOTZONE);
1785 case dns_rcode_badvers:
1786 return (DNS_R_BADVERS);
1789 return (ISC_R_FAILURE);
1793 update_sendevent(updatectx_t *uctx, isc_result_t result) {
1796 dns_message_destroy(&uctx->updatemsg);
1797 if (uctx->tsigkey != NULL)
1798 dns_tsigkey_detach(&uctx->tsigkey);
1799 if (uctx->sig0key != NULL)
1800 dst_key_free(&uctx->sig0key);
1803 uctx->event->result = ISC_R_CANCELED;
1805 uctx->event->result = result;
1806 uctx->event->state = uctx->state;
1807 task = uctx->event->ev_sender;
1808 uctx->event->ev_sender = uctx;
1809 isc_task_sendanddetach(&task, ISC_EVENT_PTR(&uctx->event));
1813 update_done(isc_task_t *task, isc_event_t *event) {
1814 isc_result_t result;
1815 dns_requestevent_t *reqev = NULL;
1816 dns_request_t *request;
1817 dns_message_t *answer = NULL;
1818 updatectx_t *uctx = event->ev_arg;
1819 dns_client_t *client;
1820 unsigned int timeout;
1824 REQUIRE(event->ev_type == DNS_EVENT_REQUESTDONE);
1825 reqev = (dns_requestevent_t *)event;
1826 request = reqev->request;
1827 REQUIRE(UCTX_VALID(uctx));
1828 client = uctx->client;
1829 REQUIRE(DNS_CLIENT_VALID(client));
1831 result = reqev->result;
1832 if (result != ISC_R_SUCCESS)
1835 result = dns_message_create(client->mctx, DNS_MESSAGE_INTENTPARSE,
1837 if (result != ISC_R_SUCCESS)
1839 uctx->state = dns_clientupdatestate_done;
1840 result = dns_request_getresponse(request, answer,
1841 DNS_MESSAGEPARSE_PRESERVEORDER);
1842 if (result == ISC_R_SUCCESS && answer->rcode != dns_rcode_noerror)
1843 result = rcode2result(answer->rcode);
1847 dns_message_destroy(&answer);
1848 isc_event_free(&event);
1851 uctx->currentserver = ISC_LIST_NEXT(uctx->currentserver, link);
1852 dns_request_destroy(&uctx->updatereq);
1853 if (result != ISC_R_SUCCESS && !uctx->canceled &&
1854 uctx->currentserver != NULL) {
1855 dns_message_renderreset(uctx->updatemsg);
1856 dns_message_settsigkey(uctx->updatemsg, NULL);
1858 timeout = client->update_timeout / uctx->nservers;
1859 if (timeout < MIN_UPDATE_TIMEOUT)
1860 timeout = MIN_UPDATE_TIMEOUT;
1861 result = dns_request_createvia3(uctx->view->requestmgr,
1864 uctx->currentserver, 0,
1867 client->update_udptimeout,
1868 client->update_udpretries,
1872 UNLOCK(&uctx->lock);
1874 if (result == ISC_R_SUCCESS) {
1875 /* XXX: should we keep the 'done' state here? */
1876 uctx->state = dns_clientupdatestate_sent;
1880 UNLOCK(&uctx->lock);
1882 update_sendevent(uctx, result);
1886 send_update(updatectx_t *uctx) {
1887 isc_result_t result;
1888 dns_name_t *name = NULL;
1889 dns_rdataset_t *rdataset = NULL;
1890 dns_client_t *client = uctx->client;
1891 unsigned int timeout;
1893 REQUIRE(uctx->zonename != NULL && uctx->currentserver != NULL);
1895 result = dns_message_gettempname(uctx->updatemsg, &name);
1896 if (result != ISC_R_SUCCESS)
1898 dns_name_init(name, NULL);
1899 dns_name_clone(uctx->zonename, name);
1900 result = dns_message_gettemprdataset(uctx->updatemsg, &rdataset);
1901 if (result != ISC_R_SUCCESS) {
1902 dns_message_puttempname(uctx->updatemsg, &name);
1905 dns_rdataset_makequestion(rdataset, uctx->rdclass, dns_rdatatype_soa);
1906 ISC_LIST_INIT(name->list);
1907 ISC_LIST_APPEND(name->list, rdataset, link);
1908 dns_message_addname(uctx->updatemsg, name, DNS_SECTION_ZONE);
1909 if (uctx->tsigkey == NULL && uctx->sig0key != NULL) {
1910 result = dns_message_setsig0key(uctx->updatemsg,
1912 if (result != ISC_R_SUCCESS)
1915 timeout = client->update_timeout / uctx->nservers;
1916 if (timeout < MIN_UPDATE_TIMEOUT)
1917 timeout = MIN_UPDATE_TIMEOUT;
1918 result = dns_request_createvia3(uctx->view->requestmgr,
1920 NULL, uctx->currentserver, 0,
1921 uctx->tsigkey, timeout,
1922 client->update_udptimeout,
1923 client->update_udpretries,
1924 client->task, update_done, uctx,
1926 if (result == ISC_R_SUCCESS &&
1927 uctx->state == dns_clientupdatestate_prepare) {
1928 uctx->state = dns_clientupdatestate_sent;
1935 resolveaddr_done(isc_task_t *task, isc_event_t *event) {
1936 isc_result_t result;
1938 dns_rdatatype_t qtype;
1939 dns_clientresevent_t *rev = (dns_clientresevent_t *)event;
1941 dns_rdataset_t *rdataset;
1943 isc_boolean_t completed = ISC_FALSE;
1947 REQUIRE(event->ev_arg != NULL);
1948 uctx = *(updatectx_t **)event->ev_arg;
1949 REQUIRE(UCTX_VALID(uctx));
1951 if (event->ev_arg == &uctx->bp4) {
1953 qtype = dns_rdatatype_a;
1955 dns_client_destroyrestrans(&uctx->restrans);
1956 UNLOCK(&uctx->lock);
1958 INSIST(event->ev_arg == &uctx->bp6);
1960 qtype = dns_rdatatype_aaaa;
1962 dns_client_destroyrestrans(&uctx->restrans2);
1963 UNLOCK(&uctx->lock);
1966 result = rev->result;
1967 if (result != ISC_R_SUCCESS)
1970 for (name = ISC_LIST_HEAD(rev->answerlist); name != NULL;
1971 name = ISC_LIST_NEXT(name, link)) {
1972 for (rdataset = ISC_LIST_HEAD(name->list);
1974 rdataset = ISC_LIST_NEXT(rdataset, link)) {
1975 if (!dns_rdataset_isassociated(rdataset))
1977 if (rdataset->type != qtype)
1980 for (result = dns_rdataset_first(rdataset);
1981 result == ISC_R_SUCCESS;
1982 result = dns_rdataset_next(rdataset)) {
1984 dns_rdata_in_a_t rdata_a;
1985 dns_rdata_in_aaaa_t rdata_aaaa;
1988 sa = isc_mem_get(uctx->client->mctx,
1992 * If we fail to get a sockaddr,
1993 we simply move forward with the
1994 * addresses we've got so far.
1999 dns_rdata_init(&rdata);
2002 dns_rdataset_current(rdataset, &rdata);
2003 dns_rdata_tostruct(&rdata, &rdata_a,
2005 isc_sockaddr_fromin(sa,
2008 dns_rdata_freestruct(&rdata_a);
2011 dns_rdataset_current(rdataset, &rdata);
2012 dns_rdata_tostruct(&rdata, &rdata_aaaa,
2014 isc_sockaddr_fromin6(sa,
2015 &rdata_aaaa.in6_addr,
2017 dns_rdata_freestruct(&rdata_aaaa);
2021 ISC_LINK_INIT(sa, link);
2022 ISC_LIST_APPEND(uctx->servers, sa, link);
2029 dns_client_freeresanswer(uctx->client, &rev->answerlist);
2030 isc_event_free(&event);
2033 if (uctx->restrans == NULL && uctx->restrans2 == NULL)
2034 completed = ISC_TRUE;
2035 UNLOCK(&uctx->lock);
2038 INSIST(uctx->currentserver == NULL);
2039 uctx->currentserver = ISC_LIST_HEAD(uctx->servers);
2040 if (uctx->currentserver != NULL && !uctx->canceled)
2043 if (result == ISC_R_SUCCESS)
2044 result = ISC_R_NOTFOUND;
2045 update_sendevent(uctx, result);
2051 process_soa(updatectx_t *uctx, dns_rdataset_t *soaset, dns_name_t *soaname) {
2052 isc_result_t result;
2053 dns_rdata_t soarr = DNS_RDATA_INIT;
2054 dns_rdata_soa_t soa;
2057 result = dns_rdataset_first(soaset);
2058 if (result != ISC_R_SUCCESS)
2060 dns_rdata_init(&soarr);
2061 dns_rdataset_current(soaset, &soarr);
2062 result = dns_rdata_tostruct(&soarr, &soa, NULL);
2063 if (result != ISC_R_SUCCESS)
2066 dns_name_init(&primary, NULL);
2067 dns_name_clone(&soa.origin, &primary);
2069 if (uctx->zonename == NULL) {
2070 uctx->zonename = dns_fixedname_name(&uctx->zonefname);
2071 result = dns_name_copy(soaname, uctx->zonename, NULL);
2072 if (result != ISC_R_SUCCESS)
2076 if (uctx->currentserver != NULL)
2077 result = send_update(uctx);
2080 * Get addresses of the primary server. We don't use the ADB
2081 * feature so that we could avoid caching data.
2085 result = dns_client_startresolve(uctx->client, &primary,
2088 0, uctx->client->task,
2089 resolveaddr_done, &uctx->bp4,
2091 if (result == ISC_R_SUCCESS) {
2093 result = dns_client_startresolve(uctx->client,
2097 0, uctx->client->task,
2102 UNLOCK(&uctx->lock);
2106 dns_rdata_freestruct(&soa);
2112 receive_soa(isc_task_t *task, isc_event_t *event) {
2113 dns_requestevent_t *reqev = NULL;
2115 dns_client_t *client;
2116 isc_result_t result, eresult;
2117 dns_request_t *request;
2118 dns_message_t *rcvmsg = NULL;
2119 dns_section_t section;
2120 dns_rdataset_t *soaset = NULL;
2123 dns_message_t *soaquery = NULL;
2124 isc_sockaddr_t *addr;
2125 isc_boolean_t seencname = ISC_FALSE;
2126 isc_boolean_t droplabel = ISC_FALSE;
2128 unsigned int nlabels;
2132 REQUIRE(event->ev_type == DNS_EVENT_REQUESTDONE);
2133 reqev = (dns_requestevent_t *)event;
2134 request = reqev->request;
2135 result = eresult = reqev->result;
2137 uctx = reqev->ev_arg;
2138 client = uctx->client;
2139 soaquery = uctx->soaquery;
2140 addr = uctx->currentserver;
2141 INSIST(addr != NULL);
2143 isc_event_free(&event);
2145 if (eresult != ISC_R_SUCCESS) {
2150 result = dns_message_create(uctx->client->mctx,
2151 DNS_MESSAGE_INTENTPARSE, &rcvmsg);
2152 if (result != ISC_R_SUCCESS)
2154 result = dns_request_getresponse(request, rcvmsg,
2155 DNS_MESSAGEPARSE_PRESERVEORDER);
2157 if (result == DNS_R_TSIGERRORSET) {
2158 dns_request_t *newrequest = NULL;
2160 /* Retry SOA request without TSIG */
2161 dns_message_destroy(&rcvmsg);
2162 dns_message_renderreset(uctx->soaquery);
2163 result = dns_request_createvia3(uctx->view->requestmgr,
2164 uctx->soaquery, NULL, addr, 0,
2166 client->find_timeout * 20,
2167 client->find_timeout, 3,
2171 if (result == ISC_R_SUCCESS) {
2173 dns_request_destroy(&uctx->soareq);
2174 uctx->soareq = newrequest;
2175 UNLOCK(&uctx->lock);
2182 section = DNS_SECTION_ANSWER;
2185 if (rcvmsg->rcode != dns_rcode_noerror &&
2186 rcvmsg->rcode != dns_rcode_nxdomain) {
2187 result = rcode2result(rcvmsg->rcode);
2193 section = DNS_SECTION_ANSWER;
2195 section = DNS_SECTION_AUTHORITY;
2197 droplabel = ISC_TRUE;
2201 result = dns_message_firstname(rcvmsg, section);
2202 if (result != ISC_R_SUCCESS) {
2206 while (result == ISC_R_SUCCESS) {
2208 dns_message_currentname(rcvmsg, section, &name);
2210 result = dns_message_findtype(name, dns_rdatatype_soa, 0,
2212 if (result == ISC_R_SUCCESS)
2214 if (section == DNS_SECTION_ANSWER) {
2215 dns_rdataset_t *tset = NULL;
2216 if (dns_message_findtype(name, dns_rdatatype_cname, 0,
2217 &tset) == ISC_R_SUCCESS
2219 dns_message_findtype(name, dns_rdatatype_dname, 0,
2220 &tset) == ISC_R_SUCCESS
2223 seencname = ISC_TRUE;
2228 result = dns_message_nextname(rcvmsg, section);
2231 if (soaset == NULL && !seencname) {
2237 droplabel = ISC_TRUE;
2241 result = process_soa(uctx, soaset, name);
2245 result = dns_message_firstname(soaquery, DNS_SECTION_QUESTION);
2246 INSIST(result == ISC_R_SUCCESS);
2248 dns_message_currentname(soaquery, DNS_SECTION_QUESTION, &name);
2249 nlabels = dns_name_countlabels(name);
2251 result = DNS_R_SERVFAIL; /* is there a better error? */
2253 dns_name_init(&tname, NULL);
2254 dns_name_getlabelsequence(name, 1, nlabels - 1,
2256 dns_name_clone(&tname, name);
2257 dns_request_destroy(&request);
2259 uctx->soareq = NULL;
2260 UNLOCK(&uctx->lock);
2261 dns_message_renderreset(soaquery);
2262 dns_message_settsigkey(soaquery, NULL);
2263 result = dns_request_createvia3(uctx->view->requestmgr,
2265 uctx->currentserver, 0,
2267 client->find_timeout *
2269 client->find_timeout,
2276 if (!droplabel || result != ISC_R_SUCCESS) {
2277 dns_message_destroy(&uctx->soaquery);
2279 dns_request_destroy(&uctx->soareq);
2280 UNLOCK(&uctx->lock);
2284 dns_message_destroy(&rcvmsg);
2286 if (result != ISC_R_SUCCESS)
2287 update_sendevent(uctx, result);
2291 request_soa(updatectx_t *uctx) {
2292 isc_result_t result;
2293 dns_message_t *soaquery = uctx->soaquery;
2294 dns_name_t *name = NULL;
2295 dns_rdataset_t *rdataset = NULL;
2297 if (soaquery == NULL) {
2298 result = dns_message_create(uctx->client->mctx,
2299 DNS_MESSAGE_INTENTRENDER,
2301 if (result != ISC_R_SUCCESS)
2304 soaquery->flags |= DNS_MESSAGEFLAG_RD;
2305 result = dns_message_gettempname(soaquery, &name);
2306 if (result != ISC_R_SUCCESS)
2308 result = dns_message_gettemprdataset(soaquery, &rdataset);
2309 if (result != ISC_R_SUCCESS)
2311 dns_rdataset_makequestion(rdataset, uctx->rdclass, dns_rdatatype_soa);
2312 dns_name_clone(uctx->firstname, name);
2313 ISC_LIST_APPEND(name->list, rdataset, link);
2314 dns_message_addname(soaquery, name, DNS_SECTION_QUESTION);
2318 result = dns_request_createvia3(uctx->view->requestmgr,
2319 soaquery, NULL, uctx->currentserver, 0,
2321 uctx->client->find_timeout * 20,
2322 uctx->client->find_timeout, 3,
2323 uctx->client->task, receive_soa, uctx,
2325 if (result == ISC_R_SUCCESS) {
2326 uctx->soaquery = soaquery;
2327 return (ISC_R_SUCCESS);
2331 if (rdataset != NULL) {
2332 ISC_LIST_UNLINK(name->list, rdataset, link); /* for safety */
2333 dns_message_puttemprdataset(soaquery, &rdataset);
2336 dns_message_puttempname(soaquery, &name);
2337 dns_message_destroy(&soaquery);
2343 resolvesoa_done(isc_task_t *task, isc_event_t *event) {
2344 dns_clientresevent_t *rev = (dns_clientresevent_t *)event;
2346 dns_name_t *name, tname;
2347 dns_rdataset_t *rdataset = NULL;
2348 isc_result_t result = rev->result;
2349 unsigned int nlabels;
2353 uctx = event->ev_arg;
2354 REQUIRE(UCTX_VALID(uctx));
2357 dns_client_destroyrestrans(&uctx->restrans);
2358 UNLOCK(&uctx->lock);
2360 uctx = event->ev_arg;
2361 if (result != ISC_R_SUCCESS &&
2362 result != DNS_R_NCACHENXDOMAIN &&
2363 result != DNS_R_NCACHENXRRSET) {
2364 /* XXX: what about DNSSEC failure? */
2368 for (name = ISC_LIST_HEAD(rev->answerlist); name != NULL;
2369 name = ISC_LIST_NEXT(name, link)) {
2370 for (rdataset = ISC_LIST_HEAD(name->list);
2372 rdataset = ISC_LIST_NEXT(rdataset, link)) {
2373 if (dns_rdataset_isassociated(rdataset) &&
2374 rdataset->type == dns_rdatatype_soa)
2379 if (rdataset == NULL) {
2380 /* Drop one label and retry resolution. */
2381 nlabels = dns_name_countlabels(&uctx->soaqname);
2383 result = DNS_R_SERVFAIL; /* is there a better error? */
2386 dns_name_init(&tname, NULL);
2387 dns_name_getlabelsequence(&uctx->soaqname, 1, nlabels - 1,
2389 dns_name_clone(&tname, &uctx->soaqname);
2391 result = dns_client_startresolve(uctx->client, &uctx->soaqname,
2393 dns_rdatatype_soa, 0,
2395 resolvesoa_done, uctx,
2398 result = process_soa(uctx, rdataset, &uctx->soaqname);
2401 dns_client_freeresanswer(uctx->client, &rev->answerlist);
2402 isc_event_free(&event);
2404 if (result != ISC_R_SUCCESS)
2405 update_sendevent(uctx, result);
2409 copy_name(isc_mem_t *mctx, dns_message_t *msg, dns_name_t *name,
2410 dns_name_t **newnamep)
2412 isc_result_t result;
2413 dns_name_t *newname = NULL;
2415 isc_buffer_t *namebuf = NULL, *rdatabuf = NULL;
2416 dns_rdatalist_t *rdatalist;
2417 dns_rdataset_t *rdataset, *newrdataset;
2418 dns_rdata_t rdata = DNS_RDATA_INIT, *newrdata;
2420 result = dns_message_gettempname(msg, &newname);
2421 if (result != ISC_R_SUCCESS)
2423 result = isc_buffer_allocate(mctx, &namebuf, DNS_NAME_MAXWIRE);
2424 if (result != ISC_R_SUCCESS)
2426 dns_name_init(newname, NULL);
2427 dns_name_setbuffer(newname, namebuf);
2428 dns_message_takebuffer(msg, &namebuf);
2429 result = dns_name_copy(name, newname, NULL);
2430 if (result != ISC_R_SUCCESS)
2433 for (rdataset = ISC_LIST_HEAD(name->list); rdataset != NULL;
2434 rdataset = ISC_LIST_NEXT(rdataset, link)) {
2436 result = dns_message_gettemprdatalist(msg, &rdatalist);
2437 if (result != ISC_R_SUCCESS)
2439 dns_rdatalist_init(rdatalist);
2440 rdatalist->type = rdataset->type;
2441 rdatalist->rdclass = rdataset->rdclass;
2442 rdatalist->covers = rdataset->covers;
2443 rdatalist->ttl = rdataset->ttl;
2445 result = dns_rdataset_first(rdataset);
2446 while (result == ISC_R_SUCCESS) {
2447 dns_rdata_reset(&rdata);
2448 dns_rdataset_current(rdataset, &rdata);
2451 result = dns_message_gettemprdata(msg, &newrdata);
2452 if (result != ISC_R_SUCCESS)
2454 dns_rdata_toregion(&rdata, &r);
2456 result = isc_buffer_allocate(mctx, &rdatabuf,
2458 if (result != ISC_R_SUCCESS)
2460 isc_buffer_putmem(rdatabuf, r.base, r.length);
2461 isc_buffer_usedregion(rdatabuf, &r);
2462 dns_rdata_init(newrdata);
2463 dns_rdata_fromregion(newrdata, rdata.rdclass,
2465 newrdata->flags = rdata.flags;
2467 ISC_LIST_APPEND(rdatalist->rdata, newrdata, link);
2468 dns_message_takebuffer(msg, &rdatabuf);
2470 result = dns_rdataset_next(rdataset);
2474 result = dns_message_gettemprdataset(msg, &newrdataset);
2475 if (result != ISC_R_SUCCESS)
2477 dns_rdataset_init(newrdataset);
2478 dns_rdatalist_tordataset(rdatalist, newrdataset);
2480 ISC_LIST_APPEND(newname->list, newrdataset, link);
2483 *newnamep = newname;
2485 return (ISC_R_SUCCESS);
2488 dns_message_puttempname(msg, &newname);
2495 internal_update_callback(isc_task_t *task, isc_event_t *event) {
2496 updatearg_t *uarg = event->ev_arg;
2497 dns_clientupdateevent_t *uev = (dns_clientupdateevent_t *)event;
2503 uarg->result = uev->result;
2505 dns_client_destroyupdatetrans(&uarg->trans);
2506 isc_event_free(&event);
2508 if (!uarg->canceled) {
2509 UNLOCK(&uarg->lock);
2511 /* Exit from the internal event loop */
2512 isc_app_ctxsuspend(uarg->actx);
2515 * We have already exited from the loop (due to some
2516 * unexpected event). Just clean the arg up.
2518 UNLOCK(&uarg->lock);
2519 DESTROYLOCK(&uarg->lock);
2520 isc_mem_put(uarg->client->mctx, uarg, sizeof(*uarg));
2525 dns_client_update(dns_client_t *client, dns_rdataclass_t rdclass,
2526 dns_name_t *zonename, dns_namelist_t *prerequisites,
2527 dns_namelist_t *updates, isc_sockaddrlist_t *servers,
2528 dns_tsec_t *tsec, unsigned int options)
2530 isc_result_t result;
2534 REQUIRE(DNS_CLIENT_VALID(client));
2536 if ((client->attributes & DNS_CLIENTATTR_OWNCTX) == 0 &&
2537 (options & DNS_CLIENTRESOPT_ALLOWRUN) == 0) {
2539 * If the client is run under application's control, we need
2540 * to create a new running (sub)environment for this
2541 * particular resolution.
2543 return (ISC_R_NOTIMPLEMENTED); /* XXXTBD */
2545 actx = client->actx;
2547 uarg = isc_mem_get(client->mctx, sizeof(*uarg));
2549 return (ISC_R_NOMEMORY);
2551 result = isc_mutex_init(&uarg->lock);
2552 if (result != ISC_R_SUCCESS) {
2553 isc_mem_put(client->mctx, uarg, sizeof(*uarg));
2558 uarg->client = client;
2559 uarg->result = ISC_R_FAILURE;
2561 uarg->canceled = ISC_FALSE;
2563 result = dns_client_startupdate(client, rdclass, zonename,
2564 prerequisites, updates, servers,
2565 tsec, options, client->task,
2566 internal_update_callback, uarg,
2568 if (result != ISC_R_SUCCESS) {
2569 DESTROYLOCK(&uarg->lock);
2570 isc_mem_put(client->mctx, uarg, sizeof(*uarg));
2575 * Start internal event loop. It blocks until the entire process
2578 result = isc_app_ctxrun(actx);
2581 if (result == ISC_R_SUCCESS || result == ISC_R_SUSPEND)
2582 result = uarg->result;
2584 if (uarg->trans != NULL) {
2586 * Unusual termination (perhaps due to signal). We need some
2587 * tricky cleanup process.
2589 uarg->canceled = ISC_TRUE;
2590 dns_client_cancelupdate(uarg->trans);
2592 UNLOCK(&uarg->lock);
2594 /* uarg will be freed in the event handler. */
2596 UNLOCK(&uarg->lock);
2598 DESTROYLOCK(&uarg->lock);
2599 isc_mem_put(client->mctx, uarg, sizeof(*uarg));
2606 dns_client_startupdate(dns_client_t *client, dns_rdataclass_t rdclass,
2607 dns_name_t *zonename, dns_namelist_t *prerequisites,
2608 dns_namelist_t *updates, isc_sockaddrlist_t *servers,
2609 dns_tsec_t *tsec, unsigned int options,
2610 isc_task_t *task, isc_taskaction_t action, void *arg,
2611 dns_clientupdatetrans_t **transp)
2613 dns_view_t *view = NULL;
2614 isc_result_t result;
2615 dns_name_t *name, *newname;
2617 isc_task_t *clone = NULL;
2618 dns_section_t section = DNS_SECTION_UPDATE;
2619 isc_sockaddr_t *server, *sa = NULL;
2620 dns_tsectype_t tsectype = dns_tsectype_none;
2624 REQUIRE(DNS_CLIENT_VALID(client));
2625 REQUIRE(transp != NULL && *transp == NULL);
2626 REQUIRE(updates != NULL);
2627 REQUIRE(task != NULL);
2630 tsectype = dns_tsec_gettype(tsec);
2631 if (tsectype != dns_tsectype_tsig)
2632 return (ISC_R_NOTIMPLEMENTED); /* XXX */
2635 LOCK(&client->lock);
2636 result = dns_viewlist_find(&client->viewlist, DNS_CLIENTVIEW_NAME,
2638 UNLOCK(&client->lock);
2639 if (result != ISC_R_SUCCESS)
2642 /* Create a context and prepare some resources */
2643 uctx = isc_mem_get(client->mctx, sizeof(*uctx));
2645 dns_view_detach(&view);
2646 return (ISC_R_NOMEMORY);
2648 result = isc_mutex_init(&uctx->lock);
2649 if (result != ISC_R_SUCCESS) {
2650 dns_view_detach(&view);
2651 isc_mem_put(client->mctx, uctx, sizeof(*uctx));
2652 return (ISC_R_NOMEMORY);
2655 isc_task_attach(task, &clone);
2656 uctx->client = client;
2657 ISC_LINK_INIT(uctx, link);
2658 uctx->state = dns_clientupdatestate_prepare;
2660 uctx->rdclass = rdclass;
2661 uctx->canceled = ISC_FALSE;
2662 uctx->updatemsg = NULL;
2663 uctx->soaquery = NULL;
2664 uctx->updatereq = NULL;
2665 uctx->restrans = NULL;
2666 uctx->restrans2 = NULL;
2669 uctx->soareq = NULL;
2671 uctx->tsigkey = NULL;
2672 uctx->sig0key = NULL;
2673 uctx->zonename = NULL;
2674 dns_name_init(&uctx->soaqname, NULL);
2675 ISC_LIST_INIT(uctx->servers);
2677 uctx->currentserver = NULL;
2678 dns_fixedname_init(&uctx->zonefname);
2680 dns_tsec_getkey(tsec, &uctx->tsigkey);
2681 uctx->event = (dns_clientupdateevent_t *)
2682 isc_event_allocate(client->mctx, clone, DNS_EVENT_UPDATEDONE,
2683 action, arg, sizeof(*uctx->event));
2684 if (uctx->event == NULL)
2686 if (zonename != NULL) {
2687 uctx->zonename = dns_fixedname_name(&uctx->zonefname);
2688 result = dns_name_copy(zonename, uctx->zonename, NULL);
2690 if (servers != NULL) {
2691 for (server = ISC_LIST_HEAD(*servers);
2693 server = ISC_LIST_NEXT(server, link)) {
2694 sa = isc_mem_get(client->mctx, sizeof(*sa));
2697 sa->type = server->type;
2698 sa->length = server->length;
2699 ISC_LINK_INIT(sa, link);
2700 ISC_LIST_APPEND(uctx->servers, sa, link);
2701 if (uctx->currentserver == NULL)
2702 uctx->currentserver = sa;
2707 /* Make update message */
2708 result = dns_message_create(client->mctx, DNS_MESSAGE_INTENTRENDER,
2710 if (result != ISC_R_SUCCESS)
2712 uctx->updatemsg->opcode = dns_opcode_update;
2714 if (prerequisites != NULL) {
2715 for (name = ISC_LIST_HEAD(*prerequisites); name != NULL;
2716 name = ISC_LIST_NEXT(name, link)) {
2718 result = copy_name(client->mctx, uctx->updatemsg,
2720 if (result != ISC_R_SUCCESS)
2722 dns_message_addname(uctx->updatemsg, newname,
2723 DNS_SECTION_PREREQUISITE);
2727 for (name = ISC_LIST_HEAD(*updates); name != NULL;
2728 name = ISC_LIST_NEXT(name, link)) {
2730 result = copy_name(client->mctx, uctx->updatemsg, name,
2732 if (result != ISC_R_SUCCESS)
2734 dns_message_addname(uctx->updatemsg, newname,
2735 DNS_SECTION_UPDATE);
2738 uctx->firstname = NULL;
2739 result = dns_message_firstname(uctx->updatemsg, section);
2740 if (result == ISC_R_NOMORE) {
2741 section = DNS_SECTION_PREREQUISITE;
2742 result = dns_message_firstname(uctx->updatemsg, section);
2744 if (result != ISC_R_SUCCESS)
2746 dns_message_currentname(uctx->updatemsg, section, &uctx->firstname);
2748 uctx->magic = UCTX_MAGIC;
2750 LOCK(&client->lock);
2751 ISC_LIST_APPEND(client->updatectxs, uctx, link);
2752 UNLOCK(&client->lock);
2754 if (uctx->zonename != NULL && uctx->currentserver != NULL) {
2755 result = send_update(uctx);
2756 if (result != ISC_R_SUCCESS)
2758 } else if (uctx->currentserver != NULL) {
2759 result = request_soa(uctx);
2760 if (result != ISC_R_SUCCESS)
2763 dns_name_clone(uctx->firstname, &uctx->soaqname);
2764 result = dns_client_startresolve(uctx->client, &uctx->soaqname,
2766 dns_rdatatype_soa, 0,
2767 client->task, resolvesoa_done,
2768 uctx, &uctx->restrans);
2769 if (result != ISC_R_SUCCESS)
2773 *transp = (dns_clientupdatetrans_t *)uctx;
2775 return (ISC_R_SUCCESS);
2778 if (ISC_LINK_LINKED(uctx, link)) {
2779 LOCK(&client->lock);
2780 ISC_LIST_UNLINK(client->updatectxs, uctx, link);
2781 UNLOCK(&client->lock);
2783 if (uctx->updatemsg != NULL)
2784 dns_message_destroy(&uctx->updatemsg);
2785 while ((sa = ISC_LIST_HEAD(uctx->servers)) != NULL) {
2786 ISC_LIST_UNLINK(uctx->servers, sa, link);
2787 isc_mem_put(client->mctx, sa, sizeof(*sa));
2789 if (uctx->event != NULL)
2790 isc_event_free(ISC_EVENT_PTR(&uctx->event));
2791 if (uctx->tsigkey != NULL)
2792 dns_tsigkey_detach(&uctx->tsigkey);
2793 isc_task_detach(&clone);
2794 DESTROYLOCK(&uctx->lock);
2796 isc_mem_put(client->mctx, uctx, sizeof(*uctx));
2797 dns_view_detach(&view);
2803 dns_client_cancelupdate(dns_clientupdatetrans_t *trans) {
2806 REQUIRE(trans != NULL);
2807 uctx = (updatectx_t *)trans;
2808 REQUIRE(UCTX_VALID(uctx));
2812 if (!uctx->canceled) {
2813 uctx->canceled = ISC_TRUE;
2814 if (uctx->updatereq != NULL)
2815 dns_request_cancel(uctx->updatereq);
2816 if (uctx->soareq != NULL)
2817 dns_request_cancel(uctx->soareq);
2818 if (uctx->restrans != NULL)
2819 dns_client_cancelresolve(uctx->restrans);
2820 if (uctx->restrans2 != NULL)
2821 dns_client_cancelresolve(uctx->restrans2);
2824 UNLOCK(&uctx->lock);
2828 dns_client_destroyupdatetrans(dns_clientupdatetrans_t **transp) {
2831 dns_client_t *client;
2832 isc_boolean_t need_destroyclient = ISC_FALSE;
2835 REQUIRE(transp != NULL);
2836 uctx = (updatectx_t *)*transp;
2837 REQUIRE(UCTX_VALID(uctx));
2838 client = uctx->client;
2839 REQUIRE(DNS_CLIENT_VALID(client));
2840 REQUIRE(uctx->updatereq == NULL && uctx->updatemsg == NULL &&
2841 uctx->soareq == NULL && uctx->soaquery == NULL &&
2842 uctx->event == NULL && uctx->tsigkey == NULL &&
2843 uctx->sig0key == NULL);
2845 mctx = client->mctx;
2846 dns_view_detach(&uctx->view);
2847 while ((sa = ISC_LIST_HEAD(uctx->servers)) != NULL) {
2848 ISC_LIST_UNLINK(uctx->servers, sa, link);
2849 isc_mem_put(mctx, sa, sizeof(*sa));
2852 LOCK(&client->lock);
2854 INSIST(ISC_LINK_LINKED(uctx, link));
2855 ISC_LIST_UNLINK(client->updatectxs, uctx, link);
2857 if (client->references == 0 && ISC_LIST_EMPTY(client->resctxs) &&
2858 ISC_LIST_EMPTY(client->reqctxs) &&
2859 ISC_LIST_EMPTY(client->updatectxs))
2860 need_destroyclient = ISC_TRUE;
2862 UNLOCK(&client->lock);
2864 DESTROYLOCK(&uctx->lock);
2867 isc_mem_put(mctx, uctx, sizeof(*uctx));
2869 if (need_destroyclient)
2870 destroyclient(&client);
2876 dns_client_mctx(dns_client_t *client) {
2878 REQUIRE(DNS_CLIENT_VALID(client));
2879 return (client->mctx);
2883 isc_buffer_t buffer;
2884 dns_rdataset_t rdataset;
2885 dns_rdatalist_t rdatalist;
2889 unsigned char data[FLEXIBLE_ARRAY_MEMBER];
2890 } dns_client_updaterec_t;
2893 dns_client_updaterec(dns_client_updateop_t op, dns_name_t *owner,
2894 dns_rdatatype_t type, dns_rdata_t *source,
2895 dns_ttl_t ttl, dns_name_t *target,
2896 dns_rdataset_t *rdataset, dns_rdatalist_t *rdatalist,
2897 dns_rdata_t *rdata, isc_mem_t *mctx)
2899 dns_client_updaterec_t *updaterec = NULL;
2900 size_t size = offsetof(dns_client_updaterec_t, data);
2902 REQUIRE(op < updateop_max);
2903 REQUIRE(owner != NULL);
2904 REQUIRE((rdataset != NULL && rdatalist != NULL && rdata != NULL) ||
2905 (rdataset == NULL && rdatalist == NULL && rdata == NULL &&
2907 if (op == updateop_add)
2908 REQUIRE(source != NULL);
2909 if (source != NULL) {
2910 REQUIRE(source->type == type);
2911 REQUIRE(op == updateop_add || op == updateop_delete ||
2912 op == updateop_exist);
2915 size += owner->length;
2917 size += source->length;
2919 if (rdataset == NULL) {
2920 updaterec = isc_mem_get(mctx, size);
2921 if (updaterec == NULL)
2922 return (ISC_R_NOMEMORY);
2923 rdataset = &updaterec->rdataset;
2924 rdatalist = &updaterec->rdatalist;
2925 rdata = &updaterec->rdata;
2926 dns_rdataset_init(rdataset);
2927 dns_rdatalist_init(&updaterec->rdatalist);
2928 dns_rdata_init(&updaterec->rdata);
2929 isc_buffer_init(&updaterec->buffer, updaterec->data,
2930 size - offsetof(dns_client_updaterec_t, data));
2931 dns_name_copy(owner, target, &updaterec->buffer);
2932 if (source != NULL) {
2934 dns_rdata_clone(source, rdata);
2935 dns_rdata_toregion(rdata, &r);
2936 rdata->data = isc_buffer_used(&updaterec->buffer);
2937 isc_buffer_copyregion(&updaterec->buffer, &r);
2939 updaterec->mctx = NULL;
2940 isc_mem_attach(mctx, &updaterec->mctx);
2941 } else if (source != NULL)
2942 dns_rdata_clone(source, rdata);
2947 case updateop_delete:
2948 if (source != NULL) {
2950 dns_rdata_makedelete(rdata);
2952 dns_rdata_deleterrset(rdata, type);
2954 case updateop_notexist:
2955 dns_rdata_notexist(rdata, type);
2957 case updateop_exist:
2958 if (source == NULL) {
2960 dns_rdata_exists(rdata, type);
2968 rdatalist->type = rdata->type;
2969 rdatalist->rdclass = rdata->rdclass;
2970 if (source != NULL) {
2971 rdatalist->covers = dns_rdata_covers(rdata);
2972 rdatalist->ttl = ttl;
2974 ISC_LIST_APPEND(rdatalist->rdata, rdata, link);
2975 dns_rdatalist_tordataset(rdatalist, rdataset);
2976 ISC_LIST_APPEND(target->list, rdataset, link);
2977 if (updaterec != NULL) {
2978 target->attributes |= DNS_NAMEATTR_HASUPDATEREC;
2979 dns_name_setbuffer(target, &updaterec->buffer);
2981 if (op == updateop_add || op == updateop_delete)
2982 target->attributes |= DNS_NAMEATTR_UPDATE;
2984 target->attributes |= DNS_NAMEATTR_PREREQUISITE;
2985 return (ISC_R_SUCCESS);
2989 dns_client_freeupdate(dns_name_t **namep) {
2990 dns_client_updaterec_t *updaterec;
2991 dns_rdatalist_t *rdatalist;
2992 dns_rdataset_t *rdataset;
2996 REQUIRE(namep != NULL && *namep != NULL);
2999 for (rdataset = ISC_LIST_HEAD(name->list);
3001 rdataset = ISC_LIST_HEAD(name->list)) {
3002 ISC_LIST_UNLINK(name->list, rdataset, link);
3004 dns_rdatalist_fromrdataset(rdataset, &rdatalist);
3005 if (rdatalist == NULL) {
3006 dns_rdataset_disassociate(rdataset);
3009 for (rdata = ISC_LIST_HEAD(rdatalist->rdata);
3011 rdata = ISC_LIST_HEAD(rdatalist->rdata))
3012 ISC_LIST_UNLINK(rdatalist->rdata, rdata, link);
3013 dns_rdataset_disassociate(rdataset);
3016 if ((name->attributes & DNS_NAMEATTR_HASUPDATEREC) != 0) {
3017 updaterec = (dns_client_updaterec_t *)name->buffer;
3018 INSIST(updaterec != NULL);
3019 isc_mem_putanddetach(&updaterec->mctx, updaterec,