2 This file is part of avahi.
4 avahi is free software; you can redistribute it and/or modify it
5 under the terms of the GNU Lesser General Public License as
6 published by the Free Software Foundation; either version 2.1 of the
7 License, or (at your option) any later version.
9 avahi is distributed in the hope that it will be useful, but WITHOUT
10 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
12 Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with avahi; if not, write to the Free Software
16 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
24 #include <sys/types.h>
25 #include <sys/socket.h>
26 #include <netinet/in.h>
27 #include <arpa/inet.h>
29 #include <sys/utsname.h>
36 #include <avahi-common/domain.h>
37 #include <avahi-common/timeval.h>
38 #include <avahi-common/malloc.h>
39 #include <avahi-common/error.h>
47 #include "dns-srv-rr.h"
48 #include "addr-util.h"
49 #include "domain-util.h"
52 static void enum_aux_records(AvahiServer *s, AvahiInterface *i, const char *name, uint16_t type, void (*callback)(AvahiServer *s, AvahiRecord *r, int flush_cache, void* userdata), void* userdata) {
58 if (type == AVAHI_DNS_TYPE_ANY) {
61 for (e = s->entries; e; e = e->entries_next)
63 avahi_entry_is_registered(s, e, i) &&
64 e->record->key->clazz == AVAHI_DNS_CLASS_IN &&
65 avahi_domain_equal(name, e->record->key->name))
66 callback(s, e->record, e->flags & AVAHI_PUBLISH_UNIQUE, userdata);
72 if (!(k = avahi_key_new(name, AVAHI_DNS_CLASS_IN, type)))
75 for (e = avahi_hashmap_lookup(s->entries_by_key, k); e; e = e->by_key_next)
76 if (!e->dead && avahi_entry_is_registered(s, e, i))
77 callback(s, e->record, e->flags & AVAHI_PUBLISH_UNIQUE, userdata);
83 void avahi_server_enumerate_aux_records(AvahiServer *s, AvahiInterface *i, AvahiRecord *r, void (*callback)(AvahiServer *s, AvahiRecord *r, int flush_cache, void* userdata), void* userdata) {
89 /* Call the specified callback far all records referenced by the one specified in *r */
91 if (r->key->clazz == AVAHI_DNS_CLASS_IN) {
92 if (r->key->type == AVAHI_DNS_TYPE_PTR) {
93 enum_aux_records(s, i, r->data.ptr.name, AVAHI_DNS_TYPE_SRV, callback, userdata);
94 enum_aux_records(s, i, r->data.ptr.name, AVAHI_DNS_TYPE_TXT, callback, userdata);
95 } else if (r->key->type == AVAHI_DNS_TYPE_SRV) {
96 enum_aux_records(s, i, r->data.srv.name, AVAHI_DNS_TYPE_A, callback, userdata);
97 enum_aux_records(s, i, r->data.srv.name, AVAHI_DNS_TYPE_AAAA, callback, userdata);
98 } else if (r->key->type == AVAHI_DNS_TYPE_CNAME)
99 enum_aux_records(s, i, r->data.cname.name, AVAHI_DNS_TYPE_ANY, callback, userdata);
103 void avahi_server_prepare_response(AvahiServer *s, AvahiInterface *i, AvahiEntry *e, int unicast_response, int auxiliary) {
108 avahi_record_list_push(s->record_list, e->record, e->flags & AVAHI_PUBLISH_UNIQUE, unicast_response, auxiliary);
111 void avahi_server_prepare_matching_responses(AvahiServer *s, AvahiInterface *i, AvahiKey *k, int unicast_response) {
116 /* Push all records that match the specified key to the record list */
118 if (avahi_key_is_pattern(k)) {
121 /* Handle ANY query */
123 for (e = s->entries; e; e = e->entries_next)
124 if (!e->dead && avahi_key_pattern_match(k, e->record->key) && avahi_entry_is_registered(s, e, i))
125 avahi_server_prepare_response(s, i, e, unicast_response, 0);
130 /* Handle all other queries */
132 for (e = avahi_hashmap_lookup(s->entries_by_key, k); e; e = e->by_key_next)
133 if (!e->dead && avahi_entry_is_registered(s, e, i))
134 avahi_server_prepare_response(s, i, e, unicast_response, 0);
137 /* Look for CNAME records */
139 if ((k->clazz == AVAHI_DNS_CLASS_IN || k->clazz == AVAHI_DNS_CLASS_ANY)
140 && k->type != AVAHI_DNS_TYPE_CNAME && k->type != AVAHI_DNS_TYPE_ANY) {
144 if (!(cname_key = avahi_key_new(k->name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_CNAME)))
147 avahi_server_prepare_matching_responses(s, i, cname_key, unicast_response);
148 avahi_key_unref(cname_key);
152 static void withdraw_entry(AvahiServer *s, AvahiEntry *e) {
156 /* Withdraw the specified entry, and if is part of an entry group,
157 * put that into COLLISION state */
165 for (k = e->group->entries; k; k = k->by_group_next)
167 avahi_goodbye_entry(s, k, 0, 1);
171 e->group->n_probing = 0;
173 avahi_s_entry_group_change_state(e->group, AVAHI_ENTRY_GROUP_COLLISION);
175 avahi_goodbye_entry(s, e, 0, 1);
179 s->need_entry_cleanup = 1;
182 static void withdraw_rrset(AvahiServer *s, AvahiKey *key) {
188 /* Withdraw an entry RRSset */
190 for (e = avahi_hashmap_lookup(s->entries_by_key, key); e; e = e->by_key_next)
191 withdraw_entry(s, e);
194 static void incoming_probe(AvahiServer *s, AvahiRecord *record, AvahiInterface *i) {
196 int ours = 0, won = 0, lost = 0;
202 /* Handle incoming probes and check if they conflict our own probes */
204 for (e = avahi_hashmap_lookup(s->entries_by_key, record->key); e; e = n) {
211 if ((cmp = avahi_record_lexicographical_compare(e->record, record)) == 0) {
216 if (avahi_entry_is_probing(s, e, i)) {
226 char *t = avahi_record_to_string(record);
229 avahi_log_debug("Received conflicting probe [%s]. Local host won.", t);
231 avahi_log_debug("Received conflicting probe [%s]. Local host lost. Withdrawing.", t);
232 withdraw_rrset(s, record->key);
239 static int handle_conflict(AvahiServer *s, AvahiInterface *i, AvahiRecord *record, int unique) {
240 int valid = 1, ours = 0, conflict = 0, withdraw_immediately = 0;
241 AvahiEntry *e, *n, *conflicting_entry = NULL;
247 /* Check whether an incoming record conflicts with one of our own */
249 for (e = avahi_hashmap_lookup(s->entries_by_key, record->key); e; e = n) {
255 /* Check if the incoming is a goodbye record */
256 if (avahi_record_is_goodbye(record)) {
258 if (avahi_record_equal_no_ttl(e->record, record)) {
262 t = avahi_record_to_string(record);
263 avahi_log_debug("Received goodbye record for one of our records [%s]. Refreshing.", t);
264 avahi_server_prepare_matching_responses(s, i, e->record->key, 0);
271 /* If the goodybe packet doesn't match one of our own RRs, we simply ignore it. */
275 if (!(e->flags & AVAHI_PUBLISH_UNIQUE) && !unique)
278 /* Either our entry or the other is intended to be unique, so let's check */
280 if (avahi_record_equal_no_ttl(e->record, record)) {
281 ours = 1; /* We have an identical record, so this is no conflict */
283 /* Check wheter there is a TTL conflict */
284 if (record->ttl <= e->record->ttl/2 &&
285 avahi_entry_is_registered(s, e, i)) {
288 t = avahi_record_to_string(record);
290 avahi_log_debug("Received record with bad TTL [%s]. Refreshing.", t);
291 avahi_server_prepare_matching_responses(s, i, e->record->key, 0);
297 /* There's no need to check the other entries of this RRset */
302 if (avahi_entry_is_registered(s, e, i)) {
304 /* A conflict => we have to return to probe mode */
306 conflicting_entry = e;
308 } else if (avahi_entry_is_probing(s, e, i)) {
310 /* We are currently registering a matching record, but
311 * someone else already claimed it, so let's
314 withdraw_immediately = 1;
319 if (!ours && conflict) {
324 t = avahi_record_to_string(record);
326 if (withdraw_immediately) {
327 avahi_log_debug("Received conflicting record [%s] with local record to be. Withdrawing.", t);
328 withdraw_rrset(s, record->key);
330 assert(conflicting_entry);
331 avahi_log_debug("Received conflicting record [%s]. Resetting our record.", t);
332 avahi_entry_return_to_initial_state(s, conflicting_entry, i);
334 /* Local unique records are returned to probing
335 * state. Local shared records are reannounced. */
344 static void append_aux_callback(AvahiServer *s, AvahiRecord *r, int flush_cache, void* userdata) {
345 int *unicast_response = userdata;
349 assert(unicast_response);
351 avahi_record_list_push(s->record_list, r, flush_cache, *unicast_response, 1);
354 static void append_aux_records_to_list(AvahiServer *s, AvahiInterface *i, AvahiRecord *r, int unicast_response) {
358 avahi_server_enumerate_aux_records(s, i, r, append_aux_callback, &unicast_response);
361 void avahi_server_generate_response(AvahiServer *s, AvahiInterface *i, AvahiDnsPacket *p, const AvahiAddress *a, uint16_t port, int legacy_unicast, int immediately) {
365 assert(!legacy_unicast || (a && port > 0 && p));
367 if (legacy_unicast) {
368 AvahiDnsPacket *reply;
371 if (!(reply = avahi_dns_packet_new_reply(p, 512 + AVAHI_DNS_PACKET_EXTRA_SIZE /* unicast DNS maximum packet size is 512 */ , 1, 1)))
374 while ((r = avahi_record_list_next(s->record_list, NULL, NULL, NULL))) {
376 append_aux_records_to_list(s, i, r, 0);
378 if (avahi_dns_packet_append_record(reply, r, 0, 10))
379 avahi_dns_packet_inc_field(reply, AVAHI_DNS_FIELD_ANCOUNT);
381 char *t = avahi_record_to_string(r);
382 avahi_log_warn("Record [%s] not fitting in legacy unicast packet, dropping.", t);
386 avahi_record_unref(r);
389 if (avahi_dns_packet_get_field(reply, AVAHI_DNS_FIELD_ANCOUNT) != 0)
390 avahi_interface_send_packet_unicast(i, reply, a, port);
392 avahi_dns_packet_free(reply);
395 int unicast_response, flush_cache, auxiliary;
396 AvahiDnsPacket *reply = NULL;
399 /* In case the query packet was truncated never respond
400 immediately, because known answer suppression records might be
401 contained in later packets */
402 int tc = p && !!(avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_FLAGS) & AVAHI_DNS_FLAG_TC);
404 while ((r = avahi_record_list_next(s->record_list, &flush_cache, &unicast_response, &auxiliary))) {
406 int im = immediately;
408 /* Only send the response immediately if it contains a
409 * unique entry AND it is not in reply to a truncated
410 * packet AND it is not an auxiliary record AND all other
411 * responses for this record are unique too. */
413 if (flush_cache && !tc && !auxiliary && avahi_record_list_all_flush_cache(s->record_list))
416 if (!avahi_interface_post_response(i, r, flush_cache, a, im) && unicast_response) {
418 /* Due to some reasons the record has not been scheduled.
419 * The client requested an unicast response in that
420 * case. Therefore we prepare such a response */
422 append_aux_records_to_list(s, i, r, unicast_response);
429 if (!(reply = avahi_dns_packet_new_reply(p, i->hardware->mtu, 0, 0)))
433 if (avahi_dns_packet_append_record(reply, r, flush_cache, 0)) {
435 /* Appending this record succeeded, so incremeant
436 * the specific header field, and return to the caller */
438 avahi_dns_packet_inc_field(reply, AVAHI_DNS_FIELD_ANCOUNT);
442 if (avahi_dns_packet_get_field(reply, AVAHI_DNS_FIELD_ANCOUNT) == 0) {
445 /* The record is too large for one packet, so create a larger packet */
447 avahi_dns_packet_free(reply);
448 size = avahi_record_get_estimate_size(r) + AVAHI_DNS_PACKET_HEADER_SIZE;
450 if (!(reply = avahi_dns_packet_new_reply(p, size + AVAHI_DNS_PACKET_EXTRA_SIZE, 0, 1)))
453 if (avahi_dns_packet_append_record(reply, r, flush_cache, 0)) {
455 /* Appending this record succeeded, so incremeant
456 * the specific header field, and return to the caller */
458 avahi_dns_packet_inc_field(reply, AVAHI_DNS_FIELD_ANCOUNT);
463 /* We completely fucked up, there's
464 * nothing we can do. The RR just doesn't
465 * fit in. Let's ignore it. */
468 avahi_dns_packet_free(reply);
470 t = avahi_record_to_string(r);
471 avahi_log_warn("Record [%s] too large, doesn't fit in any packet!", t);
477 /* Appending the record didn't succeeed, so let's send this packet, and create a new one */
478 avahi_interface_send_packet_unicast(i, reply, a, port);
479 avahi_dns_packet_free(reply);
484 avahi_record_unref(r);
488 if (avahi_dns_packet_get_field(reply, AVAHI_DNS_FIELD_ANCOUNT) != 0)
489 avahi_interface_send_packet_unicast(i, reply, a, port);
490 avahi_dns_packet_free(reply);
494 avahi_record_list_flush(s->record_list);
497 static void reflect_response(AvahiServer *s, AvahiInterface *i, AvahiRecord *r, int flush_cache) {
504 if (!s->config.enable_reflector)
507 for (j = s->monitor->interfaces; j; j = j->interface_next)
508 if (j != i && (s->config.reflect_ipv || j->protocol == i->protocol))
509 avahi_interface_post_response(j, r, flush_cache, NULL, 1);
512 static void* reflect_cache_walk_callback(AvahiCache *c, AvahiKey *pattern, AvahiCacheEntry *e, void* userdata) {
513 AvahiServer *s = userdata;
520 avahi_record_list_push(s->record_list, e->record, e->cache_flush, 0, 0);
524 static void reflect_query(AvahiServer *s, AvahiInterface *i, AvahiKey *k) {
531 if (!s->config.enable_reflector)
534 for (j = s->monitor->interfaces; j; j = j->interface_next)
535 if (j != i && (s->config.reflect_ipv || j->protocol == i->protocol)) {
536 /* Post the query to other networks */
537 avahi_interface_post_query(j, k, 1, NULL);
539 /* Reply from caches of other network. This is needed to
540 * "work around" known answer suppression. */
542 avahi_cache_walk(j->cache, k, reflect_cache_walk_callback, s);
546 static void reflect_probe(AvahiServer *s, AvahiInterface *i, AvahiRecord *r) {
553 if (!s->config.enable_reflector)
556 for (j = s->monitor->interfaces; j; j = j->interface_next)
557 if (j != i && (s->config.reflect_ipv || j->protocol == i->protocol))
558 avahi_interface_post_probe(j, r, 1);
561 static void handle_query_packet(AvahiServer *s, AvahiDnsPacket *p, AvahiInterface *i, const AvahiAddress *a, uint16_t port, int legacy_unicast, int from_local_iface) {
570 assert(avahi_record_list_is_empty(s->record_list));
572 is_probe = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT) > 0;
574 /* Handle the questions */
575 for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_QDCOUNT); n > 0; n --) {
577 int unicast_response = 0;
579 if (!(key = avahi_dns_packet_consume_key(p, &unicast_response))) {
580 avahi_log_warn(__FILE__": Packet too short or invalid while reading question key. (Maybe a UTF-8 problem?)");
584 if (!legacy_unicast && !from_local_iface) {
585 reflect_query(s, i, key);
586 if (!unicast_response)
587 avahi_cache_start_poof(i->cache, key, a);
590 if (avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) == 0 &&
591 !(avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_FLAGS) & AVAHI_DNS_FLAG_TC))
592 /* Allow our own queries to be suppressed by incoming
593 * queries only when they do not include known answers */
594 avahi_query_scheduler_incoming(i->query_scheduler, key);
596 avahi_server_prepare_matching_responses(s, i, key, unicast_response);
597 avahi_key_unref(key);
600 if (!legacy_unicast) {
602 /* Known Answer Suppression */
603 for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT); n > 0; n --) {
607 if (!(record = avahi_dns_packet_consume_record(p, &unique))) {
608 avahi_log_warn(__FILE__": Packet too short or invalid while reading known answer record. (Maybe a UTF-8 problem?)");
612 avahi_response_scheduler_suppress(i->response_scheduler, record, a);
613 avahi_record_list_drop(s->record_list, record);
614 avahi_cache_stop_poof(i->cache, record, a);
616 avahi_record_unref(record);
620 for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT); n > 0; n --) {
624 if (!(record = avahi_dns_packet_consume_record(p, &unique))) {
625 avahi_log_warn(__FILE__": Packet too short or invalid while reading probe record. (Maybe a UTF-8 problem?)");
629 if (!avahi_key_is_pattern(record->key)) {
630 if (!from_local_iface)
631 reflect_probe(s, i, record);
632 incoming_probe(s, record, i);
635 avahi_record_unref(record);
639 if (!avahi_record_list_is_empty(s->record_list))
640 avahi_server_generate_response(s, i, p, a, port, legacy_unicast, is_probe);
645 avahi_record_list_flush(s->record_list);
648 static void handle_response_packet(AvahiServer *s, AvahiDnsPacket *p, AvahiInterface *i, const AvahiAddress *a, int from_local_iface) {
656 for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) +
657 avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ARCOUNT); n > 0; n--) {
661 if (!(record = avahi_dns_packet_consume_record(p, &cache_flush))) {
662 avahi_log_warn(__FILE__": Packet too short or invalid while reading response record. (Maybe a UTF-8 problem?)");
666 if (!avahi_key_is_pattern(record->key)) {
668 if (handle_conflict(s, i, record, cache_flush)) {
669 if (!from_local_iface && !avahi_record_is_link_local_address(record))
670 reflect_response(s, i, record, cache_flush);
671 avahi_cache_update(i->cache, record, cache_flush, a);
672 avahi_response_scheduler_incoming(i->response_scheduler, record, cache_flush);
676 avahi_record_unref(record);
679 /* If the incoming response contained a conflicting record, some
680 records have been scheduled for sending. We need to flush them
682 if (!avahi_record_list_is_empty(s->record_list))
683 avahi_server_generate_response(s, i, NULL, NULL, 0, 0, 1);
686 static AvahiLegacyUnicastReflectSlot* allocate_slot(AvahiServer *s) {
687 unsigned n, idx = (unsigned) -1;
688 AvahiLegacyUnicastReflectSlot *slot;
692 if (!s->legacy_unicast_reflect_slots)
693 s->legacy_unicast_reflect_slots = avahi_new0(AvahiLegacyUnicastReflectSlot*, AVAHI_LEGACY_UNICAST_REFLECT_SLOTS_MAX);
695 for (n = 0; n < AVAHI_LEGACY_UNICAST_REFLECT_SLOTS_MAX; n++, s->legacy_unicast_reflect_id++) {
696 idx = s->legacy_unicast_reflect_id % AVAHI_LEGACY_UNICAST_REFLECT_SLOTS_MAX;
698 if (!s->legacy_unicast_reflect_slots[idx])
702 if (idx == (unsigned) -1 || s->legacy_unicast_reflect_slots[idx])
705 if (!(slot = avahi_new(AvahiLegacyUnicastReflectSlot, 1)))
706 return NULL; /* OOM */
708 s->legacy_unicast_reflect_slots[idx] = slot;
709 slot->id = s->legacy_unicast_reflect_id++;
715 static void deallocate_slot(AvahiServer *s, AvahiLegacyUnicastReflectSlot *slot) {
721 idx = slot->id % AVAHI_LEGACY_UNICAST_REFLECT_SLOTS_MAX;
723 assert(s->legacy_unicast_reflect_slots[idx] == slot);
725 avahi_time_event_free(slot->time_event);
728 s->legacy_unicast_reflect_slots[idx] = NULL;
731 static void free_slots(AvahiServer *s) {
735 if (!s->legacy_unicast_reflect_slots)
738 for (idx = 0; idx < AVAHI_LEGACY_UNICAST_REFLECT_SLOTS_MAX; idx ++)
739 if (s->legacy_unicast_reflect_slots[idx])
740 deallocate_slot(s, s->legacy_unicast_reflect_slots[idx]);
742 avahi_free(s->legacy_unicast_reflect_slots);
743 s->legacy_unicast_reflect_slots = NULL;
746 static AvahiLegacyUnicastReflectSlot* find_slot(AvahiServer *s, uint16_t id) {
751 if (!s->legacy_unicast_reflect_slots)
754 idx = id % AVAHI_LEGACY_UNICAST_REFLECT_SLOTS_MAX;
756 if (!s->legacy_unicast_reflect_slots[idx] || s->legacy_unicast_reflect_slots[idx]->id != id)
759 return s->legacy_unicast_reflect_slots[idx];
762 static void legacy_unicast_reflect_slot_timeout(AvahiTimeEvent *e, void *userdata) {
763 AvahiLegacyUnicastReflectSlot *slot = userdata;
767 assert(slot->time_event == e);
769 deallocate_slot(slot->server, slot);
772 static void reflect_legacy_unicast_query_packet(AvahiServer *s, AvahiDnsPacket *p, AvahiInterface *i, const AvahiAddress *a, uint16_t port) {
773 AvahiLegacyUnicastReflectSlot *slot;
781 assert(i->protocol == a->proto);
783 if (!s->config.enable_reflector)
786 /* Reflecting legacy unicast queries is a little more complicated
787 than reflecting normal queries, since we must route the
788 responses back to the right client. Therefore we must store
789 some information for finding the right client contact data for
790 response packets. In contrast to normal queries legacy
791 unicast query and response packets are reflected untouched and
792 are not reassembled into larger packets */
794 if (!(slot = allocate_slot(s))) {
795 /* No slot available, we drop this legacy unicast query */
796 avahi_log_warn("No slot available for legacy unicast reflection, dropping query packet.");
800 slot->original_id = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ID);
803 slot->interface = i->hardware->index;
805 avahi_elapse_time(&slot->elapse_time, 2000, 0);
806 slot->time_event = avahi_time_event_new(s->time_event_queue, &slot->elapse_time, legacy_unicast_reflect_slot_timeout, slot);
808 /* Patch the packet with our new locally generatet id */
809 avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_ID, slot->id);
811 for (j = s->monitor->interfaces; j; j = j->interface_next)
814 (s->config.reflect_ipv || j->protocol == i->protocol)) {
816 if (j->protocol == AVAHI_PROTO_INET && s->fd_legacy_unicast_ipv4 >= 0) {
817 avahi_send_dns_packet_ipv4(s->fd_legacy_unicast_ipv4, j->hardware->index, p, NULL, NULL, 0);
818 } else if (j->protocol == AVAHI_PROTO_INET6 && s->fd_legacy_unicast_ipv6 >= 0)
819 avahi_send_dns_packet_ipv6(s->fd_legacy_unicast_ipv6, j->hardware->index, p, NULL, NULL, 0);
823 avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_ID, slot->original_id);
826 static int originates_from_local_legacy_unicast_socket(AvahiServer *s, const AvahiAddress *address, uint16_t port) {
831 if (!s->config.enable_reflector)
834 if (!avahi_address_is_local(s->monitor, address))
837 if (address->proto == AVAHI_PROTO_INET && s->fd_legacy_unicast_ipv4 >= 0) {
838 struct sockaddr_in lsa;
839 socklen_t l = sizeof(lsa);
841 if (getsockname(s->fd_legacy_unicast_ipv4, (struct sockaddr*) &lsa, &l) != 0)
842 avahi_log_warn("getsockname(): %s", strerror(errno));
844 return avahi_port_from_sockaddr((struct sockaddr*) &lsa) == port;
848 if (address->proto == AVAHI_PROTO_INET6 && s->fd_legacy_unicast_ipv6 >= 0) {
849 struct sockaddr_in6 lsa;
850 socklen_t l = sizeof(lsa);
852 if (getsockname(s->fd_legacy_unicast_ipv6, (struct sockaddr*) &lsa, &l) != 0)
853 avahi_log_warn("getsockname(): %s", strerror(errno));
855 return avahi_port_from_sockaddr((struct sockaddr*) &lsa) == port;
861 static int is_mdns_mcast_address(const AvahiAddress *a) {
865 avahi_address_parse(a->proto == AVAHI_PROTO_INET ? AVAHI_IPV4_MCAST_GROUP : AVAHI_IPV6_MCAST_GROUP, a->proto, &b);
866 return avahi_address_cmp(a, &b) == 0;
869 static int originates_from_local_iface(AvahiServer *s, AvahiIfIndex iface, const AvahiAddress *a, uint16_t port) {
871 assert(iface != AVAHI_IF_UNSPEC);
874 /* If it isn't the MDNS port it can't be generated by us */
875 if (port != AVAHI_MDNS_PORT)
878 return avahi_interface_has_address(s->monitor, iface, a);
881 static void dispatch_packet(AvahiServer *s, AvahiDnsPacket *p, const AvahiAddress *src_address, uint16_t port, const AvahiAddress *dst_address, AvahiIfIndex iface, int ttl) {
883 int from_local_iface = 0;
890 assert(src_address->proto == dst_address->proto);
892 if (!(i = avahi_interface_monitor_get_interface(s->monitor, iface, src_address->proto)) ||
894 avahi_log_warn("Received packet from invalid interface.");
899 /* This fixes RHBZ #475394 */
900 avahi_log_warn("Received packet from invalid source port %u.", (unsigned) port);
904 if (avahi_address_is_ipv4_in_ipv6(src_address))
905 /* This is an IPv4 address encapsulated in IPv6, so let's ignore it. */
908 if (originates_from_local_legacy_unicast_socket(s, src_address, port))
909 /* This originates from our local reflector, so let's ignore it */
912 /* We don't want to reflect local traffic, so we check if this packet is generated locally. */
913 if (s->config.enable_reflector)
914 from_local_iface = originates_from_local_iface(s, iface, src_address, port);
916 if (avahi_dns_packet_check_valid_multicast(p) < 0) {
917 avahi_log_warn("Received invalid packet.");
921 if (avahi_dns_packet_is_query(p)) {
922 int legacy_unicast = 0;
924 if (avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ARCOUNT) != 0) {
925 avahi_log_warn("Invalid query packet.");
929 if (port != AVAHI_MDNS_PORT) {
932 if ((avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) != 0 ||
933 avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT) != 0)) {
934 avahi_log_warn("Invalid legacy unicast query packet.");
942 reflect_legacy_unicast_query_packet(s, p, i, src_address, port);
944 handle_query_packet(s, p, i, src_address, port, legacy_unicast, from_local_iface);
947 char t[AVAHI_ADDRESS_STR_MAX];
949 if (port != AVAHI_MDNS_PORT) {
950 avahi_log_warn("Received response from host %s with invalid source port %u on interface '%s.%i'", avahi_address_snprint(t, sizeof(t), src_address), port, i->hardware->name, i->protocol);
954 if (ttl != 255 && s->config.check_response_ttl) {
955 avahi_log_warn("Received response from host %s with invalid TTL %u on interface '%s.%i'.", avahi_address_snprint(t, sizeof(t), src_address), ttl, i->hardware->name, i->protocol);
959 if (!is_mdns_mcast_address(dst_address) &&
960 !avahi_interface_address_on_link(i, src_address)) {
962 avahi_log_warn("Received non-local response from host %s on interface '%s.%i'.", avahi_address_snprint(t, sizeof(t), src_address), i->hardware->name, i->protocol);
966 if (avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_QDCOUNT) != 0 ||
967 avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) == 0 ||
968 avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT) != 0) {
970 avahi_log_warn("Invalid response packet from host %s.", avahi_address_snprint(t, sizeof(t), src_address));
974 handle_response_packet(s, p, i, src_address, from_local_iface);
978 static void dispatch_legacy_unicast_packet(AvahiServer *s, AvahiDnsPacket *p) {
980 AvahiLegacyUnicastReflectSlot *slot;
985 if (avahi_dns_packet_check_valid(p) < 0 || avahi_dns_packet_is_query(p)) {
986 avahi_log_warn("Received invalid packet.");
990 if (!(slot = find_slot(s, avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ID)))) {
991 avahi_log_warn("Received legacy unicast response with unknown id");
995 if (!(j = avahi_interface_monitor_get_interface(s->monitor, slot->interface, slot->address.proto)) ||
999 /* Patch the original ID into this response */
1000 avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_ID, slot->original_id);
1002 /* Forward the response to the correct client */
1003 avahi_interface_send_packet_unicast(j, p, &slot->address, slot->port);
1005 /* Undo changes to packet */
1006 avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_ID, slot->id);
1009 static void mcast_socket_event(AvahiWatch *w, int fd, AvahiWatchEvent events, void *userdata) {
1010 AvahiServer *s = userdata;
1011 AvahiAddress dest, src;
1012 AvahiDnsPacket *p = NULL;
1019 assert(events & AVAHI_WATCH_IN);
1021 if (fd == s->fd_ipv4) {
1022 dest.proto = src.proto = AVAHI_PROTO_INET;
1023 p = avahi_recv_dns_packet_ipv4(s->fd_ipv4, &src.data.ipv4, &port, &dest.data.ipv4, &iface, &ttl);
1025 assert(fd == s->fd_ipv6);
1026 dest.proto = src.proto = AVAHI_PROTO_INET6;
1027 p = avahi_recv_dns_packet_ipv6(s->fd_ipv6, &src.data.ipv6, &port, &dest.data.ipv6, &iface, &ttl);
1031 if (iface == AVAHI_IF_UNSPEC)
1032 iface = avahi_find_interface_for_address(s->monitor, &dest);
1034 if (iface != AVAHI_IF_UNSPEC)
1035 dispatch_packet(s, p, &src, port, &dest, iface, ttl);
1037 avahi_log_error("Incoming packet received on address that isn't local.");
1039 avahi_dns_packet_free(p);
1041 avahi_cleanup_dead_entries(s);
1045 static void legacy_unicast_socket_event(AvahiWatch *w, int fd, AvahiWatchEvent events, void *userdata) {
1046 AvahiServer *s = userdata;
1047 AvahiDnsPacket *p = NULL;
1051 assert(events & AVAHI_WATCH_IN);
1053 if (fd == s->fd_legacy_unicast_ipv4)
1054 p = avahi_recv_dns_packet_ipv4(s->fd_legacy_unicast_ipv4, NULL, NULL, NULL, NULL, NULL);
1056 assert(fd == s->fd_legacy_unicast_ipv6);
1057 p = avahi_recv_dns_packet_ipv6(s->fd_legacy_unicast_ipv6, NULL, NULL, NULL, NULL, NULL);
1061 dispatch_legacy_unicast_packet(s, p);
1062 avahi_dns_packet_free(p);
1064 avahi_cleanup_dead_entries(s);
1068 static void server_set_state(AvahiServer *s, AvahiServerState state) {
1071 if (s->state == state)
1076 avahi_interface_monitor_update_rrs(s->monitor, 0);
1079 s->callback(s, state, s->userdata);
1082 static void withdraw_host_rrs(AvahiServer *s) {
1085 if (s->hinfo_entry_group)
1086 avahi_s_entry_group_reset(s->hinfo_entry_group);
1088 if (s->browse_domain_entry_group)
1089 avahi_s_entry_group_reset(s->browse_domain_entry_group);
1091 avahi_interface_monitor_update_rrs(s->monitor, 1);
1092 s->n_host_rr_pending = 0;
1095 void avahi_server_decrease_host_rr_pending(AvahiServer *s) {
1098 assert(s->n_host_rr_pending > 0);
1100 if (--s->n_host_rr_pending == 0)
1101 server_set_state(s, AVAHI_SERVER_RUNNING);
1104 void avahi_host_rr_entry_group_callback(AvahiServer *s, AvahiSEntryGroup *g, AvahiEntryGroupState state, AVAHI_GCC_UNUSED void *userdata) {
1108 if (state == AVAHI_ENTRY_GROUP_REGISTERING &&
1109 s->state == AVAHI_SERVER_REGISTERING)
1110 s->n_host_rr_pending ++;
1112 else if (state == AVAHI_ENTRY_GROUP_COLLISION &&
1113 (s->state == AVAHI_SERVER_REGISTERING || s->state == AVAHI_SERVER_RUNNING)) {
1114 withdraw_host_rrs(s);
1115 server_set_state(s, AVAHI_SERVER_COLLISION);
1117 } else if (state == AVAHI_ENTRY_GROUP_ESTABLISHED &&
1118 s->state == AVAHI_SERVER_REGISTERING)
1119 avahi_server_decrease_host_rr_pending(s);
1122 static void register_hinfo(AvahiServer *s) {
1123 struct utsname utsname;
1128 if (!s->config.publish_hinfo)
1131 if (s->hinfo_entry_group)
1132 assert(avahi_s_entry_group_is_empty(s->hinfo_entry_group));
1134 s->hinfo_entry_group = avahi_s_entry_group_new(s, avahi_host_rr_entry_group_callback, NULL);
1136 if (!s->hinfo_entry_group) {
1137 avahi_log_warn("Failed to create HINFO entry group: %s", avahi_strerror(s->error));
1141 /* Fill in HINFO rr */
1142 if ((r = avahi_record_new_full(s->host_name_fqdn, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_HINFO, AVAHI_DEFAULT_TTL_HOST_NAME))) {
1144 if (uname(&utsname) < 0)
1145 avahi_log_warn("uname() failed: %s\n", avahi_strerror(errno));
1148 r->data.hinfo.cpu = avahi_strdup(avahi_strup(utsname.machine));
1149 r->data.hinfo.os = avahi_strdup(avahi_strup(utsname.sysname));
1151 avahi_log_info("Registering HINFO record with values '%s'/'%s'.", r->data.hinfo.cpu, r->data.hinfo.os);
1153 if (avahi_server_add(s, s->hinfo_entry_group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, AVAHI_PUBLISH_UNIQUE, r) < 0) {
1154 avahi_log_warn("Failed to add HINFO RR: %s", avahi_strerror(s->error));
1159 avahi_record_unref(r);
1162 if (avahi_s_entry_group_commit(s->hinfo_entry_group) < 0)
1163 avahi_log_warn("Failed to commit HINFO entry group: %s", avahi_strerror(s->error));
1167 static void register_localhost(AvahiServer *s) {
1171 /* Add localhost entries */
1172 avahi_address_parse("127.0.0.1", AVAHI_PROTO_INET, &a);
1173 avahi_server_add_address(s, NULL, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, AVAHI_PUBLISH_NO_PROBE|AVAHI_PUBLISH_NO_ANNOUNCE, "localhost", &a);
1175 avahi_address_parse("::1", AVAHI_PROTO_INET6, &a);
1176 avahi_server_add_address(s, NULL, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, AVAHI_PUBLISH_NO_PROBE|AVAHI_PUBLISH_NO_ANNOUNCE, "ip6-localhost", &a);
1179 static void register_browse_domain(AvahiServer *s) {
1182 if (!s->config.publish_domain)
1185 if (avahi_domain_equal(s->domain_name, "local"))
1188 if (s->browse_domain_entry_group)
1189 assert(avahi_s_entry_group_is_empty(s->browse_domain_entry_group));
1191 s->browse_domain_entry_group = avahi_s_entry_group_new(s, NULL, NULL);
1193 if (!s->browse_domain_entry_group) {
1194 avahi_log_warn("Failed to create browse domain entry group: %s", avahi_strerror(s->error));
1198 if (avahi_server_add_ptr(s, s->browse_domain_entry_group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, 0, AVAHI_DEFAULT_TTL, "b._dns-sd._udp.local", s->domain_name) < 0) {
1199 avahi_log_warn("Failed to add browse domain RR: %s", avahi_strerror(s->error));
1203 if (avahi_s_entry_group_commit(s->browse_domain_entry_group) < 0)
1204 avahi_log_warn("Failed to commit browse domain entry group: %s", avahi_strerror(s->error));
1207 static void register_stuff(AvahiServer *s) {
1210 server_set_state(s, AVAHI_SERVER_REGISTERING);
1211 s->n_host_rr_pending ++; /** Make sure that the state isn't changed tp AVAHI_SERVER_RUNNING too early */
1214 register_browse_domain(s);
1215 avahi_interface_monitor_update_rrs(s->monitor, 0);
1217 s->n_host_rr_pending --;
1219 if (s->n_host_rr_pending == 0)
1220 server_set_state(s, AVAHI_SERVER_RUNNING);
1223 static void update_fqdn(AvahiServer *s) {
1227 assert(s->host_name);
1228 assert(s->domain_name);
1230 if (!(n = avahi_strdup_printf("%s.%s", s->host_name, s->domain_name)))
1233 avahi_free(s->host_name_fqdn);
1234 s->host_name_fqdn = n;
1237 int avahi_server_set_host_name(AvahiServer *s, const char *host_name) {
1241 AVAHI_CHECK_VALIDITY(s, !host_name || avahi_is_valid_host_name(host_name), AVAHI_ERR_INVALID_HOST_NAME);
1244 hn = avahi_get_host_name_strdup();
1245 hn[strcspn(hn, ".")] = 0;
1249 if (avahi_domain_equal(s->host_name, host_name) && s->state != AVAHI_SERVER_COLLISION) {
1251 return avahi_server_set_errno(s, AVAHI_ERR_NO_CHANGE);
1254 withdraw_host_rrs(s);
1256 avahi_free(s->host_name);
1257 s->host_name = hn ? hn : avahi_strdup(host_name);
1265 int avahi_server_set_domain_name(AvahiServer *s, const char *domain_name) {
1269 AVAHI_CHECK_VALIDITY(s, !domain_name || avahi_is_valid_domain_name(domain_name), AVAHI_ERR_INVALID_DOMAIN_NAME);
1272 dn = avahi_strdup("local");
1276 if (avahi_domain_equal(s->domain_name, domain_name)) {
1278 return avahi_server_set_errno(s, AVAHI_ERR_NO_CHANGE);
1281 withdraw_host_rrs(s);
1283 avahi_free(s->domain_name);
1284 s->domain_name = avahi_normalize_name_strdup(domain_name);
1293 static int valid_server_config(const AvahiServerConfig *sc) {
1298 if (sc->n_wide_area_servers > AVAHI_WIDE_AREA_SERVERS_MAX)
1299 return AVAHI_ERR_INVALID_CONFIG;
1301 if (sc->host_name && !avahi_is_valid_host_name(sc->host_name))
1302 return AVAHI_ERR_INVALID_HOST_NAME;
1304 if (sc->domain_name && !avahi_is_valid_domain_name(sc->domain_name))
1305 return AVAHI_ERR_INVALID_DOMAIN_NAME;
1307 for (l = sc->browse_domains; l; l = l->next)
1308 if (!avahi_is_valid_domain_name((char*) l->text))
1309 return AVAHI_ERR_INVALID_DOMAIN_NAME;
1314 static int setup_sockets(AvahiServer *s) {
1317 s->fd_ipv4 = s->config.use_ipv4 ? avahi_open_socket_ipv4(s->config.disallow_other_stacks) : -1;
1318 s->fd_ipv6 = s->config.use_ipv6 ? avahi_open_socket_ipv6(s->config.disallow_other_stacks) : -1;
1320 if (s->fd_ipv6 < 0 && s->fd_ipv4 < 0)
1321 return AVAHI_ERR_NO_NETWORK;
1323 if (s->fd_ipv4 < 0 && s->config.use_ipv4)
1324 avahi_log_notice("Failed to create IPv4 socket, proceeding in IPv6 only mode");
1325 else if (s->fd_ipv6 < 0 && s->config.use_ipv6)
1326 avahi_log_notice("Failed to create IPv6 socket, proceeding in IPv4 only mode");
1328 s->fd_legacy_unicast_ipv4 = s->fd_ipv4 >= 0 && s->config.enable_reflector ? avahi_open_unicast_socket_ipv4() : -1;
1329 s->fd_legacy_unicast_ipv6 = s->fd_ipv6 >= 0 && s->config.enable_reflector ? avahi_open_unicast_socket_ipv6() : -1;
1333 s->watch_legacy_unicast_ipv4 =
1334 s->watch_legacy_unicast_ipv6 = NULL;
1336 if (s->fd_ipv4 >= 0)
1337 s->watch_ipv4 = s->poll_api->watch_new(s->poll_api, s->fd_ipv4, AVAHI_WATCH_IN, mcast_socket_event, s);
1338 if (s->fd_ipv6 >= 0)
1339 s->watch_ipv6 = s->poll_api->watch_new(s->poll_api, s->fd_ipv6, AVAHI_WATCH_IN, mcast_socket_event, s);
1341 if (s->fd_legacy_unicast_ipv4 >= 0)
1342 s->watch_legacy_unicast_ipv4 = s->poll_api->watch_new(s->poll_api, s->fd_legacy_unicast_ipv4, AVAHI_WATCH_IN, legacy_unicast_socket_event, s);
1343 if (s->fd_legacy_unicast_ipv6 >= 0)
1344 s->watch_legacy_unicast_ipv6 = s->poll_api->watch_new(s->poll_api, s->fd_legacy_unicast_ipv6, AVAHI_WATCH_IN, legacy_unicast_socket_event, s);
1349 AvahiServer *avahi_server_new(const AvahiPoll *poll_api, const AvahiServerConfig *sc, AvahiServerCallback callback, void* userdata, int *error) {
1353 if (sc && (e = valid_server_config(sc)) < 0) {
1359 if (!(s = avahi_new(AvahiServer, 1))) {
1361 *error = AVAHI_ERR_NO_MEMORY;
1366 s->poll_api = poll_api;
1369 avahi_server_config_copy(&s->config, sc);
1371 avahi_server_config_init(&s->config);
1373 if ((e = setup_sockets(s)) < 0) {
1377 avahi_server_config_free(&s->config);
1383 s->n_host_rr_pending = 0;
1384 s->need_entry_cleanup = 0;
1385 s->need_group_cleanup = 0;
1386 s->need_browser_cleanup = 0;
1387 s->hinfo_entry_group = NULL;
1388 s->browse_domain_entry_group = NULL;
1389 s->error = AVAHI_OK;
1390 s->state = AVAHI_SERVER_INVALID;
1392 s->callback = callback;
1393 s->userdata = userdata;
1395 s->time_event_queue = avahi_time_event_queue_new(poll_api);
1397 s->entries_by_key = avahi_hashmap_new((AvahiHashFunc) avahi_key_hash, (AvahiEqualFunc) avahi_key_equal, NULL, NULL);
1398 AVAHI_LLIST_HEAD_INIT(AvahiEntry, s->entries);
1399 AVAHI_LLIST_HEAD_INIT(AvahiGroup, s->groups);
1401 s->record_browser_hashmap = avahi_hashmap_new((AvahiHashFunc) avahi_key_hash, (AvahiEqualFunc) avahi_key_equal, NULL, NULL);
1402 AVAHI_LLIST_HEAD_INIT(AvahiSRecordBrowser, s->record_browsers);
1403 AVAHI_LLIST_HEAD_INIT(AvahiSHostNameResolver, s->host_name_resolvers);
1404 AVAHI_LLIST_HEAD_INIT(AvahiSAddressResolver, s->address_resolvers);
1405 AVAHI_LLIST_HEAD_INIT(AvahiSDomainBrowser, s->domain_browsers);
1406 AVAHI_LLIST_HEAD_INIT(AvahiSServiceTypeBrowser, s->service_type_browsers);
1407 AVAHI_LLIST_HEAD_INIT(AvahiSServiceBrowser, s->service_browsers);
1408 AVAHI_LLIST_HEAD_INIT(AvahiSServiceResolver, s->service_resolvers);
1409 AVAHI_LLIST_HEAD_INIT(AvahiSDNSServerBrowser, s->dns_server_browsers);
1411 s->legacy_unicast_reflect_slots = NULL;
1412 s->legacy_unicast_reflect_id = 0;
1414 s->record_list = avahi_record_list_new();
1417 s->host_name = s->config.host_name ? avahi_normalize_name_strdup(s->config.host_name) : avahi_get_host_name_strdup();
1418 s->host_name[strcspn(s->host_name, ".")] = 0;
1419 s->domain_name = s->config.domain_name ? avahi_normalize_name_strdup(s->config.domain_name) : avahi_strdup("local");
1420 s->host_name_fqdn = NULL;
1424 s->local_service_cookie = (uint32_t) rand() * (uint32_t) rand();
1425 } while (s->local_service_cookie == AVAHI_SERVICE_COOKIE_INVALID);
1427 if (s->config.enable_wide_area) {
1428 s->wide_area_lookup_engine = avahi_wide_area_engine_new(s);
1429 avahi_wide_area_set_servers(s->wide_area_lookup_engine, s->config.wide_area_servers, s->config.n_wide_area_servers);
1431 s->wide_area_lookup_engine = NULL;
1433 s->multicast_lookup_engine = avahi_multicast_lookup_engine_new(s);
1435 s->monitor = avahi_interface_monitor_new(s);
1436 avahi_interface_monitor_sync(s->monitor);
1438 register_localhost(s);
1444 void avahi_server_free(AvahiServer* s) {
1447 /* Remove all browsers */
1449 while (s->dns_server_browsers)
1450 avahi_s_dns_server_browser_free(s->dns_server_browsers);
1451 while (s->host_name_resolvers)
1452 avahi_s_host_name_resolver_free(s->host_name_resolvers);
1453 while (s->address_resolvers)
1454 avahi_s_address_resolver_free(s->address_resolvers);
1455 while (s->domain_browsers)
1456 avahi_s_domain_browser_free(s->domain_browsers);
1457 while (s->service_type_browsers)
1458 avahi_s_service_type_browser_free(s->service_type_browsers);
1459 while (s->service_browsers)
1460 avahi_s_service_browser_free(s->service_browsers);
1461 while (s->service_resolvers)
1462 avahi_s_service_resolver_free(s->service_resolvers);
1463 while (s->record_browsers)
1464 avahi_s_record_browser_destroy(s->record_browsers);
1466 /* Remove all locally rgeistered stuff */
1469 avahi_entry_free(s, s->entries);
1471 avahi_interface_monitor_free(s->monitor);
1474 avahi_entry_group_free(s, s->groups);
1478 avahi_hashmap_free(s->entries_by_key);
1479 avahi_record_list_free(s->record_list);
1480 avahi_hashmap_free(s->record_browser_hashmap);
1482 if (s->wide_area_lookup_engine)
1483 avahi_wide_area_engine_free(s->wide_area_lookup_engine);
1484 avahi_multicast_lookup_engine_free(s->multicast_lookup_engine);
1486 avahi_time_event_queue_free(s->time_event_queue);
1491 s->poll_api->watch_free(s->watch_ipv4);
1493 s->poll_api->watch_free(s->watch_ipv6);
1495 if (s->watch_legacy_unicast_ipv4)
1496 s->poll_api->watch_free(s->watch_legacy_unicast_ipv4);
1497 if (s->watch_legacy_unicast_ipv6)
1498 s->poll_api->watch_free(s->watch_legacy_unicast_ipv6);
1502 if (s->fd_ipv4 >= 0)
1504 if (s->fd_ipv6 >= 0)
1507 if (s->fd_legacy_unicast_ipv4 >= 0)
1508 close(s->fd_legacy_unicast_ipv4);
1509 if (s->fd_legacy_unicast_ipv6 >= 0)
1510 close(s->fd_legacy_unicast_ipv6);
1512 /* Free other stuff */
1514 avahi_free(s->host_name);
1515 avahi_free(s->domain_name);
1516 avahi_free(s->host_name_fqdn);
1518 avahi_server_config_free(&s->config);
1523 const char* avahi_server_get_domain_name(AvahiServer *s) {
1526 return s->domain_name;
1529 const char* avahi_server_get_host_name(AvahiServer *s) {
1532 return s->host_name;
1535 const char* avahi_server_get_host_name_fqdn(AvahiServer *s) {
1538 return s->host_name_fqdn;
1541 void* avahi_server_get_data(AvahiServer *s) {
1547 void avahi_server_set_data(AvahiServer *s, void* userdata) {
1550 s->userdata = userdata;
1553 AvahiServerState avahi_server_get_state(AvahiServer *s) {
1559 AvahiServerConfig* avahi_server_config_init(AvahiServerConfig *c) {
1562 memset(c, 0, sizeof(AvahiServerConfig));
1565 c->allow_interfaces = NULL;
1566 c->deny_interfaces = NULL;
1567 c->host_name = NULL;
1568 c->domain_name = NULL;
1569 c->check_response_ttl = 0;
1570 c->publish_hinfo = 1;
1571 c->publish_addresses = 1;
1572 c->publish_workstation = 1;
1573 c->publish_domain = 1;
1574 c->use_iff_running = 0;
1575 c->enable_reflector = 0;
1577 c->add_service_cookie = 0;
1578 c->enable_wide_area = 0;
1579 c->n_wide_area_servers = 0;
1580 c->disallow_other_stacks = 0;
1581 c->browse_domains = NULL;
1582 c->disable_publishing = 0;
1583 c->allow_point_to_point = 0;
1584 c->publish_aaaa_on_ipv4 = 1;
1585 c->publish_a_on_ipv6 = 0;
1590 void avahi_server_config_free(AvahiServerConfig *c) {
1593 avahi_free(c->host_name);
1594 avahi_free(c->domain_name);
1595 avahi_string_list_free(c->browse_domains);
1596 avahi_string_list_free(c->allow_interfaces);
1597 avahi_string_list_free(c->deny_interfaces);
1600 AvahiServerConfig* avahi_server_config_copy(AvahiServerConfig *ret, const AvahiServerConfig *c) {
1601 char *d = NULL, *h = NULL;
1602 AvahiStringList *browse = NULL, *allow = NULL, *deny = NULL;
1607 if (!(h = avahi_strdup(c->host_name)))
1611 if (!(d = avahi_strdup(c->domain_name))) {
1616 if (!(browse = avahi_string_list_copy(c->browse_domains)) && c->browse_domains) {
1622 if (!(allow = avahi_string_list_copy(c->allow_interfaces)) && c->allow_interfaces) {
1623 avahi_string_list_free(browse);
1629 if (!(deny = avahi_string_list_copy(c->deny_interfaces)) && c->deny_interfaces) {
1630 avahi_string_list_free(allow);
1631 avahi_string_list_free(browse);
1639 ret->domain_name = d;
1640 ret->browse_domains = browse;
1641 ret->allow_interfaces = allow;
1642 ret->deny_interfaces = deny;
1647 int avahi_server_errno(AvahiServer *s) {
1653 /* Just for internal use */
1654 int avahi_server_set_errno(AvahiServer *s, int error) {
1657 return s->error = error;
1660 uint32_t avahi_server_get_local_service_cookie(AvahiServer *s) {
1663 return s->local_service_cookie;
1666 static AvahiEntry *find_entry(AvahiServer *s, AvahiIfIndex interface, AvahiProtocol protocol, AvahiKey *key) {
1672 for (e = avahi_hashmap_lookup(s->entries_by_key, key); e; e = e->by_key_next)
1674 if ((e->interface == interface || e->interface <= 0 || interface <= 0) &&
1675 (e->protocol == protocol || e->protocol == AVAHI_PROTO_UNSPEC || protocol == AVAHI_PROTO_UNSPEC) &&
1676 (!e->group || e->group->state == AVAHI_ENTRY_GROUP_ESTABLISHED || e->group->state == AVAHI_ENTRY_GROUP_REGISTERING))
1683 int avahi_server_get_group_of_service(AvahiServer *s, AvahiIfIndex interface, AvahiProtocol protocol, const char *name, const char *type, const char *domain, AvahiSEntryGroup** ret_group) {
1684 AvahiKey *key = NULL;
1687 char n[AVAHI_DOMAIN_NAME_MAX];
1694 AVAHI_CHECK_VALIDITY(s, AVAHI_IF_VALID(interface), AVAHI_ERR_INVALID_INTERFACE);
1695 AVAHI_CHECK_VALIDITY(s, AVAHI_PROTO_VALID(protocol), AVAHI_ERR_INVALID_PROTOCOL);
1696 AVAHI_CHECK_VALIDITY(s, avahi_is_valid_service_name(name), AVAHI_ERR_INVALID_SERVICE_NAME);
1697 AVAHI_CHECK_VALIDITY(s, avahi_is_valid_service_type_strict(type), AVAHI_ERR_INVALID_SERVICE_TYPE);
1698 AVAHI_CHECK_VALIDITY(s, !domain || avahi_is_valid_domain_name(domain), AVAHI_ERR_INVALID_DOMAIN_NAME);
1700 if ((ret = avahi_service_name_join(n, sizeof(n), name, type, domain) < 0))
1701 return avahi_server_set_errno(s, ret);
1703 if (!(key = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV)))
1704 return avahi_server_set_errno(s, AVAHI_ERR_NO_MEMORY);
1706 e = find_entry(s, interface, protocol, key);
1707 avahi_key_unref(key);
1710 *ret_group = e->group;
1714 return avahi_server_set_errno(s, AVAHI_ERR_NOT_FOUND);
1717 int avahi_server_is_service_local(AvahiServer *s, AvahiIfIndex interface, AvahiProtocol protocol, const char *name) {
1718 AvahiKey *key = NULL;
1724 if (!s->host_name_fqdn)
1727 if (!(key = avahi_key_new(name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV)))
1730 e = find_entry(s, interface, protocol, key);
1731 avahi_key_unref(key);
1736 return avahi_domain_equal(s->host_name_fqdn, e->record->data.srv.name);
1739 int avahi_server_is_record_local(AvahiServer *s, AvahiIfIndex interface, AvahiProtocol protocol, AvahiRecord *record) {
1745 for (e = avahi_hashmap_lookup(s->entries_by_key, record->key); e; e = e->by_key_next)
1747 if ((e->interface == interface || e->interface <= 0 || interface <= 0) &&
1748 (e->protocol == protocol || e->protocol == AVAHI_PROTO_UNSPEC || protocol == AVAHI_PROTO_UNSPEC) &&
1749 (!e->group || e->group->state == AVAHI_ENTRY_GROUP_ESTABLISHED || e->group->state == AVAHI_ENTRY_GROUP_REGISTERING) &&
1750 avahi_record_equal_no_ttl(record, e->record))
1756 /** Set the wide area DNS servers */
1757 int avahi_server_set_wide_area_servers(AvahiServer *s, const AvahiAddress *a, unsigned n) {
1760 if (!s->wide_area_lookup_engine)
1761 return avahi_server_set_errno(s, AVAHI_ERR_INVALID_CONFIG);
1763 avahi_wide_area_set_servers(s->wide_area_lookup_engine, a, n);
1767 const AvahiServerConfig* avahi_server_get_config(AvahiServer *s) {
1773 /** Set the browsing domains */
1774 int avahi_server_set_browse_domains(AvahiServer *s, AvahiStringList *domains) {
1779 for (l = s->config.browse_domains; l; l = l->next)
1780 if (!avahi_is_valid_domain_name((char*) l->text))
1781 return avahi_server_set_errno(s, AVAHI_ERR_INVALID_DOMAIN_NAME);
1783 avahi_string_list_free(s->config.browse_domains);
1784 s->config.browse_domains = avahi_string_list_copy(domains);