4 This file is part of avahi.
6 avahi is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as
8 published by the Free Software Foundation; either version 2.1 of the
9 License, or (at your option) any later version.
11 avahi is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
14 Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with avahi; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
30 #include <avahi-common/domain.h>
31 #include <avahi-common/timeval.h>
32 #include <avahi-common/malloc.h>
33 #include <avahi-common/error.h>
38 #define TIMEOUT_MSEC 5000
40 struct AvahiSServiceResolver {
45 AvahiProtocol address_protocol;
47 AvahiIfIndex interface;
48 AvahiProtocol protocol;
50 AvahiSRecordBrowser *record_browser_srv;
51 AvahiSRecordBrowser *record_browser_txt;
52 AvahiSRecordBrowser *record_browser_a;
53 AvahiSRecordBrowser *record_browser_aaaa;
55 AvahiRecord *srv_record, *txt_record, *address_record;
56 AvahiLookupResultFlags srv_flags, txt_flags, address_flags;
58 AvahiSServiceResolverCallback callback;
60 AvahiLookupFlags user_flags;
62 AvahiTimeEvent *time_event;
64 AVAHI_LLIST_FIELDS(AvahiSServiceResolver, resolver);
67 static void finish(AvahiSServiceResolver *r, AvahiResolverEvent event) {
68 AvahiLookupResultFlags flags;
73 avahi_time_event_free(r->time_event);
83 case AVAHI_RESOLVER_FAILURE:
102 case AVAHI_RESOLVER_FOUND: {
105 assert(event == AVAHI_RESOLVER_FOUND);
107 assert(r->srv_record);
109 if (r->address_record) {
110 switch (r->address_record->key->type) {
111 case AVAHI_DNS_TYPE_A:
112 a.proto = AVAHI_PROTO_INET;
113 a.data.ipv4 = r->address_record->data.a.address;
116 case AVAHI_DNS_TYPE_AAAA:
117 a.proto = AVAHI_PROTO_INET6;
118 a.data.ipv6 = r->address_record->data.aaaa.address;
134 r->srv_record->data.srv.name,
135 r->address_record ? &a : NULL,
136 r->srv_record->data.srv.port,
137 r->txt_record ? r->txt_record->data.txt.string_list : NULL,
146 static void time_event_callback(AvahiTimeEvent *e, void *userdata) {
147 AvahiSServiceResolver *r = userdata;
152 avahi_server_set_errno(r->server, AVAHI_ERR_TIMEOUT);
153 finish(r, AVAHI_RESOLVER_FAILURE);
156 static void start_timeout(AvahiSServiceResolver *r) {
163 avahi_elapse_time(&tv, TIMEOUT_MSEC, 0);
165 r->time_event = avahi_time_event_new(r->server->time_event_queue, &tv, time_event_callback, r);
168 static void record_browser_callback(
169 AvahiSRecordBrowser*rr,
170 AvahiIfIndex interface,
171 AvahiProtocol protocol,
172 AvahiBrowserEvent event,
174 AvahiLookupResultFlags flags,
177 AvahiSServiceResolver *r = userdata;
182 if (rr == r->record_browser_aaaa || rr == r->record_browser_a)
183 r->address_flags = flags;
184 else if (rr == r->record_browser_srv)
185 r->srv_flags = flags;
186 else if (rr == r->record_browser_txt)
187 r->txt_flags = flags;
191 case AVAHI_BROWSER_NEW: {
195 if (r->interface > 0 && interface > 0 && interface != r->interface)
198 if (r->protocol != AVAHI_PROTO_UNSPEC && protocol != AVAHI_PROTO_UNSPEC && protocol != r->protocol)
201 if (r->interface <= 0)
202 r->interface = interface;
204 if (r->protocol == AVAHI_PROTO_UNSPEC)
205 r->protocol = protocol;
207 switch (record->key->type) {
208 case AVAHI_DNS_TYPE_SRV:
209 if (!r->srv_record) {
210 r->srv_record = avahi_record_ref(record);
213 if (r->record_browser_a) {
214 avahi_s_record_browser_free(r->record_browser_a);
215 r->record_browser_a = NULL;
218 if (r->record_browser_aaaa) {
219 avahi_s_record_browser_free(r->record_browser_aaaa);
220 r->record_browser_aaaa = NULL;
223 if (!(r->user_flags & AVAHI_LOOKUP_NO_ADDRESS)) {
225 if (r->address_protocol == AVAHI_PROTO_INET || r->address_protocol == AVAHI_PROTO_UNSPEC) {
226 AvahiKey *k = avahi_key_new(r->srv_record->data.srv.name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_A);
227 r->record_browser_a = avahi_s_record_browser_new(r->server, r->interface, r->protocol, k, r->user_flags & ~(AVAHI_LOOKUP_NO_TXT|AVAHI_LOOKUP_NO_ADDRESS), record_browser_callback, r);
231 if (r->address_protocol == AVAHI_PROTO_INET6 || r->address_protocol == AVAHI_PROTO_UNSPEC) {
232 AvahiKey *k = avahi_key_new(r->srv_record->data.srv.name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_AAAA);
233 r->record_browser_aaaa = avahi_s_record_browser_new(r->server, r->interface, r->protocol, k, r->user_flags & ~(AVAHI_LOOKUP_NO_TXT|AVAHI_LOOKUP_NO_ADDRESS), record_browser_callback, r);
240 case AVAHI_DNS_TYPE_TXT:
242 assert(!(r->user_flags & AVAHI_LOOKUP_NO_TXT));
244 if (!r->txt_record) {
245 r->txt_record = avahi_record_ref(record);
250 case AVAHI_DNS_TYPE_A:
251 case AVAHI_DNS_TYPE_AAAA:
253 assert(!(r->user_flags & AVAHI_LOOKUP_NO_ADDRESS));
255 if (!r->address_record) {
256 r->address_record = avahi_record_ref(record);
268 (r->txt_record || (r->user_flags & AVAHI_LOOKUP_NO_TXT)) &&
269 (r->address_record || (r->user_flags & AVAHI_LOOKUP_NO_ADDRESS)))
270 finish(r, AVAHI_RESOLVER_FOUND);
276 case AVAHI_BROWSER_REMOVE:
280 switch (record->key->type) {
281 case AVAHI_DNS_TYPE_SRV:
283 if (r->srv_record && avahi_record_equal_no_ttl(record, r->srv_record)) {
284 avahi_record_unref(r->srv_record);
285 r->srv_record = NULL;
287 if (r->record_browser_a) {
288 avahi_s_record_browser_free(r->record_browser_a);
289 r->record_browser_a = NULL;
292 if (r->record_browser_aaaa) {
293 avahi_s_record_browser_free(r->record_browser_aaaa);
294 r->record_browser_aaaa = NULL;
297 /** Look for a replacement */
298 avahi_s_record_browser_restart(r->record_browser_srv);
304 case AVAHI_DNS_TYPE_TXT:
306 assert(!(r->user_flags & AVAHI_LOOKUP_NO_TXT));
308 if (r->txt_record && avahi_record_equal_no_ttl(record, r->txt_record)) {
309 avahi_record_unref(r->txt_record);
310 r->txt_record = NULL;
312 /** Look for a replacement */
313 avahi_s_record_browser_restart(r->record_browser_txt);
318 case AVAHI_DNS_TYPE_A:
319 case AVAHI_DNS_TYPE_AAAA:
321 assert(!(r->user_flags & AVAHI_LOOKUP_NO_ADDRESS));
323 if (r->address_record && avahi_record_equal_no_ttl(record, r->address_record)) {
324 avahi_record_unref(r->address_record);
325 r->address_record = NULL;
327 /** Look for a replacement */
328 if (r->record_browser_aaaa)
329 avahi_s_record_browser_restart(r->record_browser_aaaa);
330 if (r->record_browser_a)
331 avahi_s_record_browser_restart(r->record_browser_a);
342 case AVAHI_BROWSER_CACHE_EXHAUSTED:
343 case AVAHI_BROWSER_ALL_FOR_NOW:
346 case AVAHI_BROWSER_FAILURE:
348 if (rr == r->record_browser_a && r->record_browser_aaaa) {
349 /* We were looking for both AAAA and A, and the other query is still living, so we'll not die */
350 avahi_s_record_browser_free(r->record_browser_a);
351 r->record_browser_a = NULL;
355 if (rr == r->record_browser_aaaa && r->record_browser_a) {
356 /* We were looking for both AAAA and A, and the other query is still living, so we'll not die */
357 avahi_s_record_browser_free(r->record_browser_aaaa);
358 r->record_browser_aaaa = NULL;
362 /* Hmm, everything's lost, tell the user */
364 if (r->record_browser_srv)
365 avahi_s_record_browser_free(r->record_browser_srv);
366 if (r->record_browser_txt)
367 avahi_s_record_browser_free(r->record_browser_txt);
368 if (r->record_browser_a)
369 avahi_s_record_browser_free(r->record_browser_a);
370 if (r->record_browser_aaaa)
371 avahi_s_record_browser_free(r->record_browser_aaaa);
373 r->record_browser_srv = r->record_browser_txt = r->record_browser_a = r->record_browser_aaaa = NULL;
375 finish(r, AVAHI_RESOLVER_FAILURE);
380 AvahiSServiceResolver *avahi_s_service_resolver_new(
382 AvahiIfIndex interface,
383 AvahiProtocol protocol,
387 AvahiProtocol aprotocol,
388 AvahiLookupFlags flags,
389 AvahiSServiceResolverCallback callback,
392 AvahiSServiceResolver *r;
394 char n[AVAHI_DOMAIN_NAME_MAX];
401 AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_IF_VALID(interface), AVAHI_ERR_INVALID_INTERFACE);
402 AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_PROTO_VALID(protocol), AVAHI_ERR_INVALID_PROTOCOL);
403 AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_PROTO_VALID(aprotocol), AVAHI_ERR_INVALID_PROTOCOL);
404 AVAHI_CHECK_VALIDITY_RETURN_NULL(server, !domain || avahi_is_valid_domain_name(domain), AVAHI_ERR_INVALID_DOMAIN_NAME);
405 AVAHI_CHECK_VALIDITY_RETURN_NULL(server, !name || avahi_is_valid_service_name(name), AVAHI_ERR_INVALID_SERVICE_NAME);
406 AVAHI_CHECK_VALIDITY_RETURN_NULL(server, avahi_is_valid_service_type_strict(type), AVAHI_ERR_INVALID_SERVICE_TYPE);
407 AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_FLAGS_VALID(flags, AVAHI_LOOKUP_USE_WIDE_AREA|AVAHI_LOOKUP_USE_MULTICAST|AVAHI_LOOKUP_NO_TXT|AVAHI_LOOKUP_NO_ADDRESS), AVAHI_ERR_INVALID_FLAGS);
410 domain = server->domain_name;
412 if ((ret = avahi_service_name_join(n, sizeof(n), name, type, domain)) < 0) {
413 avahi_server_set_errno(server, ret);
417 if (!(r = avahi_new(AvahiSServiceResolver, 1))) {
418 avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
423 r->service_name = avahi_strdup(name);
424 r->service_type = avahi_normalize_name_strdup(type);
425 r->domain_name = avahi_normalize_name_strdup(domain);
426 r->callback = callback;
427 r->userdata = userdata;
428 r->address_protocol = aprotocol;
429 r->srv_record = r->txt_record = r->address_record = NULL;
430 r->srv_flags = r->txt_flags = r->address_flags = 0;
431 r->interface = interface;
432 r->protocol = protocol;
433 r->user_flags = flags;
434 r->record_browser_a = r->record_browser_aaaa = r->record_browser_srv = r->record_browser_txt = NULL;
435 r->time_event = NULL;
436 AVAHI_LLIST_PREPEND(AvahiSServiceResolver, resolver, server->service_resolvers, r);
438 k = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV);
439 r->record_browser_srv = avahi_s_record_browser_new(server, interface, protocol, k, flags & ~(AVAHI_LOOKUP_NO_TXT|AVAHI_LOOKUP_NO_ADDRESS), record_browser_callback, r);
442 if (!r->record_browser_srv) {
443 avahi_s_service_resolver_free(r);
447 if (!(flags & AVAHI_LOOKUP_NO_TXT)) {
448 k = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_TXT);
449 r->record_browser_txt = avahi_s_record_browser_new(server, interface, protocol, k, flags & ~(AVAHI_LOOKUP_NO_TXT|AVAHI_LOOKUP_NO_ADDRESS), record_browser_callback, r);
452 if (!r->record_browser_txt) {
453 avahi_s_service_resolver_free(r);
463 void avahi_s_service_resolver_free(AvahiSServiceResolver *r) {
466 AVAHI_LLIST_REMOVE(AvahiSServiceResolver, resolver, r->server->service_resolvers, r);
469 avahi_time_event_free(r->time_event);
471 if (r->record_browser_srv)
472 avahi_s_record_browser_free(r->record_browser_srv);
473 if (r->record_browser_txt)
474 avahi_s_record_browser_free(r->record_browser_txt);
475 if (r->record_browser_a)
476 avahi_s_record_browser_free(r->record_browser_a);
477 if (r->record_browser_aaaa)
478 avahi_s_record_browser_free(r->record_browser_aaaa);
481 avahi_record_unref(r->srv_record);
483 avahi_record_unref(r->txt_record);
484 if (r->address_record)
485 avahi_record_unref(r->address_record);
487 avahi_free(r->service_name);
488 avahi_free(r->service_type);
489 avahi_free(r->domain_name);