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:
84 case AVAHI_RESOLVER_NOT_FOUND:
85 case AVAHI_RESOLVER_TIMEOUT:
104 case AVAHI_RESOLVER_FOUND: {
107 assert(event == AVAHI_RESOLVER_FOUND);
109 assert(r->srv_record);
111 if (r->address_record) {
112 switch (r->address_record->key->type) {
113 case AVAHI_DNS_TYPE_A:
114 a.proto = AVAHI_PROTO_INET;
115 a.data.ipv4 = r->address_record->data.a.address;
118 case AVAHI_DNS_TYPE_AAAA:
119 a.proto = AVAHI_PROTO_INET6;
120 a.data.ipv6 = r->address_record->data.aaaa.address;
136 r->address_record ? r->address_record->key->name : r->srv_record->data.srv.name,
137 r->address_record ? &a : NULL,
138 r->srv_record->data.srv.port,
139 r->txt_record ? r->txt_record->data.txt.string_list : NULL,
148 static void time_event_callback(AvahiTimeEvent *e, void *userdata) {
149 AvahiSServiceResolver *r = userdata;
154 avahi_log_debug("timeout");
156 finish(r, AVAHI_RESOLVER_TIMEOUT);
159 static void start_timeout(AvahiSServiceResolver *r) {
166 avahi_elapse_time(&tv, TIMEOUT_MSEC, 0);
168 r->time_event = avahi_time_event_new(r->server->time_event_queue, &tv, time_event_callback, r);
171 static void record_browser_callback(
172 AvahiSRecordBrowser*rr,
173 AvahiIfIndex interface,
174 AvahiProtocol protocol,
175 AvahiBrowserEvent event,
177 AvahiLookupResultFlags flags,
180 AvahiSServiceResolver *r = userdata;
185 if (rr == r->record_browser_aaaa || rr == r->record_browser_a)
186 r->address_flags = flags;
187 else if (rr == r->record_browser_srv)
188 r->srv_flags = flags;
189 else if (rr == r->record_browser_txt)
190 r->txt_flags = flags;
194 case AVAHI_BROWSER_NEW: {
198 if (r->interface > 0 && interface != r->interface)
201 if (r->protocol != AVAHI_PROTO_UNSPEC && protocol != r->protocol)
204 if (r->interface <= 0)
205 r->interface = interface;
207 if (r->protocol == AVAHI_PROTO_UNSPEC)
208 r->protocol = protocol;
210 switch (record->key->type) {
211 case AVAHI_DNS_TYPE_SRV:
212 if (!r->srv_record) {
213 r->srv_record = avahi_record_ref(record);
216 if (r->record_browser_a) {
217 avahi_s_record_browser_free(r->record_browser_a);
218 r->record_browser_a = NULL;
221 if (r->record_browser_aaaa) {
222 avahi_s_record_browser_free(r->record_browser_aaaa);
223 r->record_browser_aaaa = NULL;
226 if (!(r->user_flags & AVAHI_LOOKUP_NO_ADDRESS)) {
228 if (r->address_protocol == AVAHI_PROTO_INET || r->address_protocol == AVAHI_PROTO_UNSPEC) {
229 AvahiKey *k = avahi_key_new(r->srv_record->data.srv.name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_A);
230 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);
234 if (r->address_protocol == AVAHI_PROTO_INET6 || r->address_protocol == AVAHI_PROTO_UNSPEC) {
235 AvahiKey *k = avahi_key_new(r->srv_record->data.srv.name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_AAAA);
236 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);
243 case AVAHI_DNS_TYPE_TXT:
245 assert(!(r->user_flags & AVAHI_LOOKUP_NO_TXT));
247 if (!r->txt_record) {
248 r->txt_record = avahi_record_ref(record);
253 case AVAHI_DNS_TYPE_A:
254 case AVAHI_DNS_TYPE_AAAA:
256 assert(!(r->user_flags & AVAHI_LOOKUP_NO_ADDRESS));
258 if (!r->address_record) {
259 r->address_record = avahi_record_ref(record);
271 (r->txt_record || (r->user_flags & AVAHI_LOOKUP_NO_TXT)) &&
272 (r->address_record || (r->user_flags & AVAHI_LOOKUP_NO_ADDRESS)))
273 finish(r, AVAHI_RESOLVER_FOUND);
279 case AVAHI_BROWSER_REMOVE:
283 switch (record->key->type) {
284 case AVAHI_DNS_TYPE_SRV:
286 if (r->srv_record && avahi_record_equal_no_ttl(record, r->srv_record)) {
287 avahi_record_unref(r->srv_record);
288 r->srv_record = NULL;
290 if (r->record_browser_a) {
291 avahi_s_record_browser_free(r->record_browser_a);
292 r->record_browser_a = NULL;
295 if (r->record_browser_aaaa) {
296 avahi_s_record_browser_free(r->record_browser_aaaa);
297 r->record_browser_aaaa = NULL;
300 /** Look for a replacement */
301 avahi_s_record_browser_restart(r->record_browser_srv);
307 case AVAHI_DNS_TYPE_TXT:
309 assert(!(r->user_flags & AVAHI_LOOKUP_NO_TXT));
311 if (r->txt_record && avahi_record_equal_no_ttl(record, r->txt_record)) {
312 avahi_record_unref(r->txt_record);
313 r->txt_record = NULL;
315 /** Look for a replacement */
316 avahi_s_record_browser_restart(r->record_browser_txt);
321 case AVAHI_DNS_TYPE_A:
322 case AVAHI_DNS_TYPE_AAAA:
324 assert(!(r->user_flags & AVAHI_LOOKUP_NO_ADDRESS));
326 if (r->address_record && avahi_record_equal_no_ttl(record, r->address_record)) {
327 avahi_record_unref(r->address_record);
328 r->address_record = NULL;
330 /** Look for a replacement */
331 if (r->record_browser_aaaa)
332 avahi_s_record_browser_restart(r->record_browser_aaaa);
333 if (r->record_browser_a)
334 avahi_s_record_browser_restart(r->record_browser_a);
345 case AVAHI_BROWSER_CACHE_EXHAUSTED:
346 case AVAHI_BROWSER_ALL_FOR_NOW:
349 case AVAHI_BROWSER_NOT_FOUND:
350 case AVAHI_BROWSER_FAILURE:
352 if (r->record_browser_srv)
353 avahi_s_record_browser_free(r->record_browser_srv);
354 if (r->record_browser_txt)
355 avahi_s_record_browser_free(r->record_browser_txt);
356 if (r->record_browser_a)
357 avahi_s_record_browser_free(r->record_browser_a);
358 if (r->record_browser_aaaa)
359 avahi_s_record_browser_free(r->record_browser_aaaa);
361 r->record_browser_srv = r->record_browser_txt = r->record_browser_a = r->record_browser_aaaa = NULL;
363 finish(r, event == AVAHI_BROWSER_FAILURE ? AVAHI_RESOLVER_FAILURE : AVAHI_RESOLVER_NOT_FOUND);
368 AvahiSServiceResolver *avahi_s_service_resolver_new(
370 AvahiIfIndex interface,
371 AvahiProtocol protocol,
375 AvahiProtocol aprotocol,
376 AvahiLookupFlags flags,
377 AvahiSServiceResolverCallback callback,
380 AvahiSServiceResolver *r;
388 assert(aprotocol == AVAHI_PROTO_UNSPEC || aprotocol == AVAHI_PROTO_INET || aprotocol == AVAHI_PROTO_INET6);
390 if (!AVAHI_IF_VALID(interface)) {
391 avahi_server_set_errno(server, AVAHI_ERR_INVALID_INTERFACE);
395 if (name && !avahi_is_valid_service_name(name)) {
396 avahi_server_set_errno(server, AVAHI_ERR_INVALID_SERVICE_NAME);
400 if (!avahi_is_valid_service_type(type)) {
401 avahi_server_set_errno(server, AVAHI_ERR_INVALID_SERVICE_TYPE);
405 if (domain && !avahi_is_valid_domain_name(domain)) {
406 avahi_server_set_errno(server, AVAHI_ERR_INVALID_DOMAIN_NAME);
411 domain = server->domain_name;
413 if (!AVAHI_VALID_FLAGS(flags, AVAHI_LOOKUP_USE_WIDE_AREA|AVAHI_LOOKUP_USE_MULTICAST|AVAHI_LOOKUP_NO_TXT|AVAHI_LOOKUP_NO_ADDRESS)) {
414 avahi_server_set_errno(server, AVAHI_ERR_INVALID_FLAGS);
418 if (!(r = avahi_new(AvahiSServiceResolver, 1))) {
419 avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
424 r->service_name = avahi_strdup(name);
425 r->service_type = avahi_normalize_name(type);
426 r->domain_name = avahi_normalize_name(domain);
427 r->callback = callback;
428 r->userdata = userdata;
429 r->address_protocol = aprotocol;
430 r->srv_record = r->txt_record = r->address_record = NULL;
431 r->srv_flags = r->txt_flags = r->address_flags = 0;
432 r->interface = interface;
433 r->protocol = protocol;
434 r->user_flags = flags;
442 avahi_escape_label((const uint8_t*) name, strlen(name), &n, &l);
443 snprintf(n, l, ".%s.%s", r->service_type, r->domain_name);
445 snprintf(t, sizeof(t), "%s.%s", r->service_type, r->domain_name);
447 r->time_event = NULL;
449 AVAHI_LLIST_PREPEND(AvahiSServiceResolver, resolver, server->service_resolvers, r);
451 r->record_browser_a = r->record_browser_aaaa = r->record_browser_srv = r->record_browser_txt = NULL;
453 k = avahi_key_new(t, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV);
454 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);
457 if (!r->record_browser_srv) {
458 avahi_s_service_resolver_free(r);
462 if (!(flags & AVAHI_LOOKUP_NO_TXT)) {
463 k = avahi_key_new(t, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_TXT);
464 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);
467 if (!r->record_browser_txt) {
468 avahi_s_service_resolver_free(r);
478 void avahi_s_service_resolver_free(AvahiSServiceResolver *r) {
481 AVAHI_LLIST_REMOVE(AvahiSServiceResolver, resolver, r->server->service_resolvers, r);
484 avahi_time_event_free(r->time_event);
486 if (r->record_browser_srv)
487 avahi_s_record_browser_free(r->record_browser_srv);
488 if (r->record_browser_txt)
489 avahi_s_record_browser_free(r->record_browser_txt);
490 if (r->record_browser_a)
491 avahi_s_record_browser_free(r->record_browser_a);
492 if (r->record_browser_aaaa)
493 avahi_s_record_browser_free(r->record_browser_aaaa);
496 avahi_record_unref(r->srv_record);
498 avahi_record_unref(r->txt_record);
499 if (r->address_record)
500 avahi_record_unref(r->address_record);
502 avahi_free(r->service_name);
503 avahi_free(r->service_type);
504 avahi_free(r->domain_name);