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 #define AVAHI_DEFAULT_CACHE_ENTRIES_MAX 4096
54 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) {
60 if (type == AVAHI_DNS_TYPE_ANY) {
63 for (e = s->entries; e; e = e->entries_next)
65 avahi_entry_is_registered(s, e, i) &&
66 e->record->key->clazz == AVAHI_DNS_CLASS_IN &&
67 avahi_domain_equal(name, e->record->key->name))
68 callback(s, e->record, e->flags & AVAHI_PUBLISH_UNIQUE, userdata);
74 if (!(k = avahi_key_new(name, AVAHI_DNS_CLASS_IN, type)))
77 for (e = avahi_hashmap_lookup(s->entries_by_key, k); e; e = e->by_key_next)
78 if (!e->dead && avahi_entry_is_registered(s, e, i))
79 callback(s, e->record, e->flags & AVAHI_PUBLISH_UNIQUE, userdata);
85 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) {
91 /* Call the specified callback far all records referenced by the one specified in *r */
93 if (r->key->clazz == AVAHI_DNS_CLASS_IN) {
94 if (r->key->type == AVAHI_DNS_TYPE_PTR) {
95 enum_aux_records(s, i, r->data.ptr.name, AVAHI_DNS_TYPE_SRV, callback, userdata);
96 enum_aux_records(s, i, r->data.ptr.name, AVAHI_DNS_TYPE_TXT, callback, userdata);
97 } else if (r->key->type == AVAHI_DNS_TYPE_SRV) {
98 enum_aux_records(s, i, r->data.srv.name, AVAHI_DNS_TYPE_A, callback, userdata);
99 enum_aux_records(s, i, r->data.srv.name, AVAHI_DNS_TYPE_AAAA, callback, userdata);
100 } else if (r->key->type == AVAHI_DNS_TYPE_CNAME)
101 enum_aux_records(s, i, r->data.cname.name, AVAHI_DNS_TYPE_ANY, callback, userdata);
105 void avahi_server_prepare_response(AvahiServer *s, AvahiInterface *i, AvahiEntry *e, int unicast_response, int auxiliary) {
110 avahi_record_list_push(s->record_list, e->record, e->flags & AVAHI_PUBLISH_UNIQUE, unicast_response, auxiliary);
113 void avahi_server_prepare_matching_responses(AvahiServer *s, AvahiInterface *i, AvahiKey *k, int unicast_response) {
118 /* Push all records that match the specified key to the record list */
120 if (avahi_key_is_pattern(k)) {
123 /* Handle ANY query */
125 for (e = s->entries; e; e = e->entries_next)
126 if (!e->dead && avahi_key_pattern_match(k, e->record->key) && avahi_entry_is_registered(s, e, i))
127 avahi_server_prepare_response(s, i, e, unicast_response, 0);
132 /* Handle all other queries */
134 for (e = avahi_hashmap_lookup(s->entries_by_key, k); e; e = e->by_key_next)
135 if (!e->dead && avahi_entry_is_registered(s, e, i))
136 avahi_server_prepare_response(s, i, e, unicast_response, 0);
139 /* Look for CNAME records */
141 if ((k->clazz == AVAHI_DNS_CLASS_IN || k->clazz == AVAHI_DNS_CLASS_ANY)
142 && k->type != AVAHI_DNS_TYPE_CNAME && k->type != AVAHI_DNS_TYPE_ANY) {
146 if (!(cname_key = avahi_key_new(k->name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_CNAME)))
149 avahi_server_prepare_matching_responses(s, i, cname_key, unicast_response);
150 avahi_key_unref(cname_key);
154 static void withdraw_entry(AvahiServer *s, AvahiEntry *e) {
158 /* Withdraw the specified entry, and if is part of an entry group,
159 * put that into COLLISION state */
167 for (k = e->group->entries; k; k = k->by_group_next)
169 avahi_goodbye_entry(s, k, 0, 1);
173 e->group->n_probing = 0;
175 avahi_s_entry_group_change_state(e->group, AVAHI_ENTRY_GROUP_COLLISION);
177 avahi_goodbye_entry(s, e, 0, 1);
181 s->need_entry_cleanup = 1;
184 static void withdraw_rrset(AvahiServer *s, AvahiKey *key) {
190 /* Withdraw an entry RRSset */
192 for (e = avahi_hashmap_lookup(s->entries_by_key, key); e; e = e->by_key_next)
193 withdraw_entry(s, e);
196 static void incoming_probe(AvahiServer *s, AvahiRecord *record, AvahiInterface *i) {
198 int ours = 0, won = 0, lost = 0;
204 /* Handle incoming probes and check if they conflict our own probes */
206 for (e = avahi_hashmap_lookup(s->entries_by_key, record->key); e; e = n) {
213 if ((cmp = avahi_record_lexicographical_compare(e->record, record)) == 0) {
218 if (avahi_entry_is_probing(s, e, i)) {
228 char *t = avahi_record_to_string(record);
231 avahi_log_debug("Received conflicting probe [%s]. Local host won.", t);
233 avahi_log_debug("Received conflicting probe [%s]. Local host lost. Withdrawing.", t);
234 withdraw_rrset(s, record->key);
241 static int handle_conflict(AvahiServer *s, AvahiInterface *i, AvahiRecord *record, int unique) {
242 int valid = 1, ours = 0, conflict = 0, withdraw_immediately = 0;
243 AvahiEntry *e, *n, *conflicting_entry = NULL;
249 /* Check whether an incoming record conflicts with one of our own */
251 for (e = avahi_hashmap_lookup(s->entries_by_key, record->key); e; e = n) {
257 /* Check if the incoming is a goodbye record */
258 if (avahi_record_is_goodbye(record)) {
260 if (avahi_record_equal_no_ttl(e->record, record)) {
264 t = avahi_record_to_string(record);
265 avahi_log_debug("Received goodbye record for one of our records [%s]. Refreshing.", t);
266 avahi_server_prepare_matching_responses(s, i, e->record->key, 0);
273 /* If the goodybe packet doesn't match one of our own RRs, we simply ignore it. */
277 if (!(e->flags & AVAHI_PUBLISH_UNIQUE) && !unique)
280 /* Either our entry or the other is intended to be unique, so let's check */
282 if (avahi_record_equal_no_ttl(e->record, record)) {
283 ours = 1; /* We have an identical record, so this is no conflict */
285 /* Check wheter there is a TTL conflict */
286 if (record->ttl <= e->record->ttl/2 &&
287 avahi_entry_is_registered(s, e, i)) {
290 t = avahi_record_to_string(record);
292 avahi_log_debug("Received record with bad TTL [%s]. Refreshing.", t);
293 avahi_server_prepare_matching_responses(s, i, e->record->key, 0);
299 /* There's no need to check the other entries of this RRset */
304 if (avahi_entry_is_registered(s, e, i)) {
306 /* A conflict => we have to return to probe mode */
308 conflicting_entry = e;
310 } else if (avahi_entry_is_probing(s, e, i)) {
312 /* We are currently registering a matching record, but
313 * someone else already claimed it, so let's
316 withdraw_immediately = 1;
321 if (!ours && conflict) {
326 t = avahi_record_to_string(record);
328 if (withdraw_immediately) {
329 avahi_log_debug("Received conflicting record [%s] with local record to be. Withdrawing.", t);
330 withdraw_rrset(s, record->key);
332 assert(conflicting_entry);
333 avahi_log_debug("Received conflicting record [%s]. Resetting our record.", t);
334 avahi_entry_return_to_initial_state(s, conflicting_entry, i);
336 /* Local unique records are returned to probing
337 * state. Local shared records are reannounced. */
346 static void append_aux_callback(AvahiServer *s, AvahiRecord *r, int flush_cache, void* userdata) {
347 int *unicast_response = userdata;
351 assert(unicast_response);
353 avahi_record_list_push(s->record_list, r, flush_cache, *unicast_response, 1);
356 static void append_aux_records_to_list(AvahiServer *s, AvahiInterface *i, AvahiRecord *r, int unicast_response) {
360 avahi_server_enumerate_aux_records(s, i, r, append_aux_callback, &unicast_response);
363 void avahi_server_generate_response(AvahiServer *s, AvahiInterface *i, AvahiDnsPacket *p, const AvahiAddress *a, uint16_t port, int legacy_unicast, int immediately) {
367 assert(!legacy_unicast || (a && port > 0 && p));
369 if (legacy_unicast) {
370 AvahiDnsPacket *reply;
373 if (!(reply = avahi_dns_packet_new_reply(p, 512 + AVAHI_DNS_PACKET_EXTRA_SIZE /* unicast DNS maximum packet size is 512 */ , 1, 1)))
376 while ((r = avahi_record_list_next(s->record_list, NULL, NULL, NULL))) {
378 append_aux_records_to_list(s, i, r, 0);
380 if (avahi_dns_packet_append_record(reply, r, 0, 10))
381 avahi_dns_packet_inc_field(reply, AVAHI_DNS_FIELD_ANCOUNT);
383 char *t = avahi_record_to_string(r);
384 avahi_log_warn("Record [%s] not fitting in legacy unicast packet, dropping.", t);
388 avahi_record_unref(r);
391 if (avahi_dns_packet_get_field(reply, AVAHI_DNS_FIELD_ANCOUNT) != 0)
392 avahi_interface_send_packet_unicast(i, reply, a, port);
394 avahi_dns_packet_free(reply);
397 int unicast_response, flush_cache, auxiliary;
398 AvahiDnsPacket *reply = NULL;
401 /* In case the query packet was truncated never respond
402 immediately, because known answer suppression records might be
403 contained in later packets */
404 int tc = p && !!(avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_FLAGS) & AVAHI_DNS_FLAG_TC);
406 while ((r = avahi_record_list_next(s->record_list, &flush_cache, &unicast_response, &auxiliary))) {
408 int im = immediately;
410 /* Only send the response immediately if it contains a
411 * unique entry AND it is not in reply to a truncated
412 * packet AND it is not an auxiliary record AND all other
413 * responses for this record are unique too. */
415 if (flush_cache && !tc && !auxiliary && avahi_record_list_all_flush_cache(s->record_list))
418 if (!avahi_interface_post_response(i, r, flush_cache, a, im) && unicast_response) {
420 /* Due to some reasons the record has not been scheduled.
421 * The client requested an unicast response in that
422 * case. Therefore we prepare such a response */
424 append_aux_records_to_list(s, i, r, unicast_response);
431 if (!(reply = avahi_dns_packet_new_reply(p, i->hardware->mtu, 0, 0)))
435 if (avahi_dns_packet_append_record(reply, r, flush_cache, 0)) {
437 /* Appending this record succeeded, so incremeant
438 * the specific header field, and return to the caller */
440 avahi_dns_packet_inc_field(reply, AVAHI_DNS_FIELD_ANCOUNT);
444 if (avahi_dns_packet_get_field(reply, AVAHI_DNS_FIELD_ANCOUNT) == 0) {
447 /* The record is too large for one packet, so create a larger packet */
449 avahi_dns_packet_free(reply);
450 size = avahi_record_get_estimate_size(r) + AVAHI_DNS_PACKET_HEADER_SIZE;
452 if (!(reply = avahi_dns_packet_new_reply(p, size + AVAHI_DNS_PACKET_EXTRA_SIZE, 0, 1)))
455 if (avahi_dns_packet_append_record(reply, r, flush_cache, 0)) {
457 /* Appending this record succeeded, so incremeant
458 * the specific header field, and return to the caller */
460 avahi_dns_packet_inc_field(reply, AVAHI_DNS_FIELD_ANCOUNT);
465 /* We completely fucked up, there's
466 * nothing we can do. The RR just doesn't
467 * fit in. Let's ignore it. */
470 avahi_dns_packet_free(reply);
472 t = avahi_record_to_string(r);
473 avahi_log_warn("Record [%s] too large, doesn't fit in any packet!", t);
479 /* Appending the record didn't succeeed, so let's send this packet, and create a new one */
480 avahi_interface_send_packet_unicast(i, reply, a, port);
481 avahi_dns_packet_free(reply);
486 avahi_record_unref(r);
490 if (avahi_dns_packet_get_field(reply, AVAHI_DNS_FIELD_ANCOUNT) != 0)
491 avahi_interface_send_packet_unicast(i, reply, a, port);
492 avahi_dns_packet_free(reply);
496 avahi_record_list_flush(s->record_list);
499 static void reflect_response(AvahiServer *s, AvahiInterface *i, AvahiRecord *r, int flush_cache) {
506 if (!s->config.enable_reflector)
509 for (j = s->monitor->interfaces; j; j = j->interface_next)
510 if (j != i && (s->config.reflect_ipv || j->protocol == i->protocol))
511 avahi_interface_post_response(j, r, flush_cache, NULL, 1);
514 static void* reflect_cache_walk_callback(AvahiCache *c, AvahiKey *pattern, AvahiCacheEntry *e, void* userdata) {
515 AvahiServer *s = userdata;
522 avahi_record_list_push(s->record_list, e->record, e->cache_flush, 0, 0);
526 static void reflect_query(AvahiServer *s, AvahiInterface *i, AvahiKey *k) {
533 if (!s->config.enable_reflector)
536 for (j = s->monitor->interfaces; j; j = j->interface_next)
537 if (j != i && (s->config.reflect_ipv || j->protocol == i->protocol)) {
538 /* Post the query to other networks */
539 avahi_interface_post_query(j, k, 1, NULL);
541 /* Reply from caches of other network. This is needed to
542 * "work around" known answer suppression. */
544 avahi_cache_walk(j->cache, k, reflect_cache_walk_callback, s);
548 static void reflect_probe(AvahiServer *s, AvahiInterface *i, AvahiRecord *r) {
555 if (!s->config.enable_reflector)
558 for (j = s->monitor->interfaces; j; j = j->interface_next)
559 if (j != i && (s->config.reflect_ipv || j->protocol == i->protocol))
560 avahi_interface_post_probe(j, r, 1);
563 static void handle_query_packet(AvahiServer *s, AvahiDnsPacket *p, AvahiInterface *i, const AvahiAddress *a, uint16_t port, int legacy_unicast, int from_local_iface) {
572 assert(avahi_record_list_is_empty(s->record_list));
574 is_probe = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT) > 0;
576 /* Handle the questions */
577 for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_QDCOUNT); n > 0; n --) {
579 int unicast_response = 0;
581 if (!(key = avahi_dns_packet_consume_key(p, &unicast_response))) {
582 avahi_log_warn(__FILE__": Packet too short or invalid while reading question key. (Maybe a UTF-8 problem?)");
586 if (!legacy_unicast && !from_local_iface) {
587 reflect_query(s, i, key);
588 if (!unicast_response)
589 avahi_cache_start_poof(i->cache, key, a);
592 if (avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) == 0 &&
593 !(avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_FLAGS) & AVAHI_DNS_FLAG_TC))
594 /* Allow our own queries to be suppressed by incoming
595 * queries only when they do not include known answers */
596 avahi_query_scheduler_incoming(i->query_scheduler, key);
598 avahi_server_prepare_matching_responses(s, i, key, unicast_response);
599 avahi_key_unref(key);
602 if (!legacy_unicast) {
604 /* Known Answer Suppression */
605 for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT); n > 0; n --) {
609 if (!(record = avahi_dns_packet_consume_record(p, &unique))) {
610 avahi_log_warn(__FILE__": Packet too short or invalid while reading known answer record. (Maybe a UTF-8 problem?)");
614 avahi_response_scheduler_suppress(i->response_scheduler, record, a);
615 avahi_record_list_drop(s->record_list, record);
616 avahi_cache_stop_poof(i->cache, record, a);
618 avahi_record_unref(record);
622 for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT); n > 0; n --) {
626 if (!(record = avahi_dns_packet_consume_record(p, &unique))) {
627 avahi_log_warn(__FILE__": Packet too short or invalid while reading probe record. (Maybe a UTF-8 problem?)");
631 if (!avahi_key_is_pattern(record->key)) {
632 if (!from_local_iface)
633 reflect_probe(s, i, record);
634 incoming_probe(s, record, i);
637 avahi_record_unref(record);
641 if (!avahi_record_list_is_empty(s->record_list))
642 avahi_server_generate_response(s, i, p, a, port, legacy_unicast, is_probe);
647 avahi_record_list_flush(s->record_list);
650 static void handle_response_packet(AvahiServer *s, AvahiDnsPacket *p, AvahiInterface *i, const AvahiAddress *a, int from_local_iface) {
658 for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) +
659 avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ARCOUNT); n > 0; n--) {
663 if (!(record = avahi_dns_packet_consume_record(p, &cache_flush))) {
664 avahi_log_warn(__FILE__": Packet too short or invalid while reading response record. (Maybe a UTF-8 problem?)");
668 if (!avahi_key_is_pattern(record->key)) {
670 if (handle_conflict(s, i, record, cache_flush)) {
671 if (!from_local_iface && !avahi_record_is_link_local_address(record))
672 reflect_response(s, i, record, cache_flush);
673 avahi_cache_update(i->cache, record, cache_flush, a);
674 avahi_response_scheduler_incoming(i->response_scheduler, record, cache_flush);
678 avahi_record_unref(record);
681 /* If the incoming response contained a conflicting record, some
682 records have been scheduled for sending. We need to flush them
684 if (!avahi_record_list_is_empty(s->record_list))
685 avahi_server_generate_response(s, i, NULL, NULL, 0, 0, 1);
688 static AvahiLegacyUnicastReflectSlot* allocate_slot(AvahiServer *s) {
689 unsigned n, idx = (unsigned) -1;
690 AvahiLegacyUnicastReflectSlot *slot;
694 if (!s->legacy_unicast_reflect_slots)
695 s->legacy_unicast_reflect_slots = avahi_new0(AvahiLegacyUnicastReflectSlot*, AVAHI_LEGACY_UNICAST_REFLECT_SLOTS_MAX);
697 for (n = 0; n < AVAHI_LEGACY_UNICAST_REFLECT_SLOTS_MAX; n++, s->legacy_unicast_reflect_id++) {
698 idx = s->legacy_unicast_reflect_id % AVAHI_LEGACY_UNICAST_REFLECT_SLOTS_MAX;
700 if (!s->legacy_unicast_reflect_slots[idx])
704 if (idx == (unsigned) -1 || s->legacy_unicast_reflect_slots[idx])
707 if (!(slot = avahi_new(AvahiLegacyUnicastReflectSlot, 1)))
708 return NULL; /* OOM */
710 s->legacy_unicast_reflect_slots[idx] = slot;
711 slot->id = s->legacy_unicast_reflect_id++;
717 static void deallocate_slot(AvahiServer *s, AvahiLegacyUnicastReflectSlot *slot) {
723 idx = slot->id % AVAHI_LEGACY_UNICAST_REFLECT_SLOTS_MAX;
725 assert(s->legacy_unicast_reflect_slots[idx] == slot);
727 avahi_time_event_free(slot->time_event);
730 s->legacy_unicast_reflect_slots[idx] = NULL;
733 static void free_slots(AvahiServer *s) {
737 if (!s->legacy_unicast_reflect_slots)
740 for (idx = 0; idx < AVAHI_LEGACY_UNICAST_REFLECT_SLOTS_MAX; idx ++)
741 if (s->legacy_unicast_reflect_slots[idx])
742 deallocate_slot(s, s->legacy_unicast_reflect_slots[idx]);
744 avahi_free(s->legacy_unicast_reflect_slots);
745 s->legacy_unicast_reflect_slots = NULL;
748 static AvahiLegacyUnicastReflectSlot* find_slot(AvahiServer *s, uint16_t id) {
753 if (!s->legacy_unicast_reflect_slots)
756 idx = id % AVAHI_LEGACY_UNICAST_REFLECT_SLOTS_MAX;
758 if (!s->legacy_unicast_reflect_slots[idx] || s->legacy_unicast_reflect_slots[idx]->id != id)
761 return s->legacy_unicast_reflect_slots[idx];
764 static void legacy_unicast_reflect_slot_timeout(AvahiTimeEvent *e, void *userdata) {
765 AvahiLegacyUnicastReflectSlot *slot = userdata;
769 assert(slot->time_event == e);
771 deallocate_slot(slot->server, slot);
774 static void reflect_legacy_unicast_query_packet(AvahiServer *s, AvahiDnsPacket *p, AvahiInterface *i, const AvahiAddress *a, uint16_t port) {
775 AvahiLegacyUnicastReflectSlot *slot;
783 assert(i->protocol == a->proto);
785 if (!s->config.enable_reflector)
788 /* Reflecting legacy unicast queries is a little more complicated
789 than reflecting normal queries, since we must route the
790 responses back to the right client. Therefore we must store
791 some information for finding the right client contact data for
792 response packets. In contrast to normal queries legacy
793 unicast query and response packets are reflected untouched and
794 are not reassembled into larger packets */
796 if (!(slot = allocate_slot(s))) {
797 /* No slot available, we drop this legacy unicast query */
798 avahi_log_warn("No slot available for legacy unicast reflection, dropping query packet.");
802 slot->original_id = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ID);
805 slot->interface = i->hardware->index;
807 avahi_elapse_time(&slot->elapse_time, 2000, 0);
808 slot->time_event = avahi_time_event_new(s->time_event_queue, &slot->elapse_time, legacy_unicast_reflect_slot_timeout, slot);
810 /* Patch the packet with our new locally generatet id */
811 avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_ID, slot->id);
813 for (j = s->monitor->interfaces; j; j = j->interface_next)
816 (s->config.reflect_ipv || j->protocol == i->protocol)) {
818 if (j->protocol == AVAHI_PROTO_INET && s->fd_legacy_unicast_ipv4 >= 0) {
819 avahi_send_dns_packet_ipv4(s->fd_legacy_unicast_ipv4, j->hardware->index, p, NULL, NULL, 0);
820 } else if (j->protocol == AVAHI_PROTO_INET6 && s->fd_legacy_unicast_ipv6 >= 0)
821 avahi_send_dns_packet_ipv6(s->fd_legacy_unicast_ipv6, j->hardware->index, p, NULL, NULL, 0);
825 avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_ID, slot->original_id);
828 static int originates_from_local_legacy_unicast_socket(AvahiServer *s, const AvahiAddress *address, uint16_t port) {
833 if (!s->config.enable_reflector)
836 if (!avahi_address_is_local(s->monitor, address))
839 if (address->proto == AVAHI_PROTO_INET && s->fd_legacy_unicast_ipv4 >= 0) {
840 struct sockaddr_in lsa;
841 socklen_t l = sizeof(lsa);
843 if (getsockname(s->fd_legacy_unicast_ipv4, (struct sockaddr*) &lsa, &l) != 0)
844 avahi_log_warn("getsockname(): %s", strerror(errno));
846 return avahi_port_from_sockaddr((struct sockaddr*) &lsa) == port;
850 if (address->proto == AVAHI_PROTO_INET6 && s->fd_legacy_unicast_ipv6 >= 0) {
851 struct sockaddr_in6 lsa;
852 socklen_t l = sizeof(lsa);
854 if (getsockname(s->fd_legacy_unicast_ipv6, (struct sockaddr*) &lsa, &l) != 0)
855 avahi_log_warn("getsockname(): %s", strerror(errno));
857 return avahi_port_from_sockaddr((struct sockaddr*) &lsa) == port;
863 static int is_mdns_mcast_address(const AvahiAddress *a) {
867 avahi_address_parse(a->proto == AVAHI_PROTO_INET ? AVAHI_IPV4_MCAST_GROUP : AVAHI_IPV6_MCAST_GROUP, a->proto, &b);
868 return avahi_address_cmp(a, &b) == 0;
871 static int originates_from_local_iface(AvahiServer *s, AvahiIfIndex iface, const AvahiAddress *a, uint16_t port) {
873 assert(iface != AVAHI_IF_UNSPEC);
876 /* If it isn't the MDNS port it can't be generated by us */
877 if (port != AVAHI_MDNS_PORT)
880 return avahi_interface_has_address(s->monitor, iface, a);
883 static void dispatch_packet(AvahiServer *s, AvahiDnsPacket *p, const AvahiAddress *src_address, uint16_t port, const AvahiAddress *dst_address, AvahiIfIndex iface, int ttl) {
885 int from_local_iface = 0;
892 assert(src_address->proto == dst_address->proto);
894 if (!(i = avahi_interface_monitor_get_interface(s->monitor, iface, src_address->proto)) ||
896 avahi_log_warn("Received packet from invalid interface.");
901 /* This fixes RHBZ #475394 */
902 avahi_log_warn("Received packet from invalid source port %u.", (unsigned) port);
906 if (avahi_address_is_ipv4_in_ipv6(src_address))
907 /* This is an IPv4 address encapsulated in IPv6, so let's ignore it. */
910 if (originates_from_local_legacy_unicast_socket(s, src_address, port))
911 /* This originates from our local reflector, so let's ignore it */
914 /* We don't want to reflect local traffic, so we check if this packet is generated locally. */
915 if (s->config.enable_reflector)
916 from_local_iface = originates_from_local_iface(s, iface, src_address, port);
918 if (avahi_dns_packet_check_valid_multicast(p) < 0) {
919 avahi_log_warn("Received invalid packet.");
923 if (avahi_dns_packet_is_query(p)) {
924 int legacy_unicast = 0;
926 /* For queries EDNS0 might allow ARCOUNT != 0. We ignore the
927 * AR section completely here, so far. Until the day we add
930 if (port != AVAHI_MDNS_PORT) {
933 if ((avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) != 0 ||
934 avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT) != 0)) {
935 avahi_log_warn("Invalid legacy unicast query packet.");
943 reflect_legacy_unicast_query_packet(s, p, i, src_address, port);
945 handle_query_packet(s, p, i, src_address, port, legacy_unicast, from_local_iface);
948 char t[AVAHI_ADDRESS_STR_MAX];
950 if (port != AVAHI_MDNS_PORT) {
951 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);
955 if (ttl != 255 && s->config.check_response_ttl) {
956 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);
960 if (!is_mdns_mcast_address(dst_address) &&
961 !avahi_interface_address_on_link(i, src_address)) {
963 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);
967 if (avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_QDCOUNT) != 0 ||
968 avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) == 0 ||
969 avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT) != 0) {
971 avahi_log_warn("Invalid response packet from host %s.", avahi_address_snprint(t, sizeof(t), src_address));
975 handle_response_packet(s, p, i, src_address, from_local_iface);
979 static void dispatch_legacy_unicast_packet(AvahiServer *s, AvahiDnsPacket *p) {
981 AvahiLegacyUnicastReflectSlot *slot;
986 if (avahi_dns_packet_check_valid(p) < 0 || avahi_dns_packet_is_query(p)) {
987 avahi_log_warn("Received invalid packet.");
991 if (!(slot = find_slot(s, avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ID)))) {
992 avahi_log_warn("Received legacy unicast response with unknown id");
996 if (!(j = avahi_interface_monitor_get_interface(s->monitor, slot->interface, slot->address.proto)) ||
1000 /* Patch the original ID into this response */
1001 avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_ID, slot->original_id);
1003 /* Forward the response to the correct client */
1004 avahi_interface_send_packet_unicast(j, p, &slot->address, slot->port);
1006 /* Undo changes to packet */
1007 avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_ID, slot->id);
1010 static void mcast_socket_event(AvahiWatch *w, int fd, AvahiWatchEvent events, void *userdata) {
1011 AvahiServer *s = userdata;
1012 AvahiAddress dest, src;
1013 AvahiDnsPacket *p = NULL;
1020 assert(events & AVAHI_WATCH_IN);
1022 if (fd == s->fd_ipv4) {
1023 dest.proto = src.proto = AVAHI_PROTO_INET;
1024 p = avahi_recv_dns_packet_ipv4(s->fd_ipv4, &src.data.ipv4, &port, &dest.data.ipv4, &iface, &ttl);
1026 assert(fd == s->fd_ipv6);
1027 dest.proto = src.proto = AVAHI_PROTO_INET6;
1028 p = avahi_recv_dns_packet_ipv6(s->fd_ipv6, &src.data.ipv6, &port, &dest.data.ipv6, &iface, &ttl);
1032 if (iface == AVAHI_IF_UNSPEC)
1033 iface = avahi_find_interface_for_address(s->monitor, &dest);
1035 if (iface != AVAHI_IF_UNSPEC)
1036 dispatch_packet(s, p, &src, port, &dest, iface, ttl);
1038 avahi_log_error("Incoming packet received on address that isn't local.");
1040 avahi_dns_packet_free(p);
1042 avahi_cleanup_dead_entries(s);
1046 static void legacy_unicast_socket_event(AvahiWatch *w, int fd, AvahiWatchEvent events, void *userdata) {
1047 AvahiServer *s = userdata;
1048 AvahiDnsPacket *p = NULL;
1052 assert(events & AVAHI_WATCH_IN);
1054 if (fd == s->fd_legacy_unicast_ipv4)
1055 p = avahi_recv_dns_packet_ipv4(s->fd_legacy_unicast_ipv4, NULL, NULL, NULL, NULL, NULL);
1057 assert(fd == s->fd_legacy_unicast_ipv6);
1058 p = avahi_recv_dns_packet_ipv6(s->fd_legacy_unicast_ipv6, NULL, NULL, NULL, NULL, NULL);
1062 dispatch_legacy_unicast_packet(s, p);
1063 avahi_dns_packet_free(p);
1065 avahi_cleanup_dead_entries(s);
1069 static void server_set_state(AvahiServer *s, AvahiServerState state) {
1072 if (s->state == state)
1077 avahi_interface_monitor_update_rrs(s->monitor, 0);
1080 s->callback(s, state, s->userdata);
1083 static void withdraw_host_rrs(AvahiServer *s) {
1086 if (s->hinfo_entry_group)
1087 avahi_s_entry_group_reset(s->hinfo_entry_group);
1089 if (s->browse_domain_entry_group)
1090 avahi_s_entry_group_reset(s->browse_domain_entry_group);
1092 avahi_interface_monitor_update_rrs(s->monitor, 1);
1093 s->n_host_rr_pending = 0;
1096 void avahi_server_decrease_host_rr_pending(AvahiServer *s) {
1099 assert(s->n_host_rr_pending > 0);
1101 if (--s->n_host_rr_pending == 0)
1102 server_set_state(s, AVAHI_SERVER_RUNNING);
1105 void avahi_host_rr_entry_group_callback(AvahiServer *s, AvahiSEntryGroup *g, AvahiEntryGroupState state, AVAHI_GCC_UNUSED void *userdata) {
1109 if (state == AVAHI_ENTRY_GROUP_REGISTERING &&
1110 s->state == AVAHI_SERVER_REGISTERING)
1111 s->n_host_rr_pending ++;
1113 else if (state == AVAHI_ENTRY_GROUP_COLLISION &&
1114 (s->state == AVAHI_SERVER_REGISTERING || s->state == AVAHI_SERVER_RUNNING)) {
1115 withdraw_host_rrs(s);
1116 server_set_state(s, AVAHI_SERVER_COLLISION);
1118 } else if (state == AVAHI_ENTRY_GROUP_ESTABLISHED &&
1119 s->state == AVAHI_SERVER_REGISTERING)
1120 avahi_server_decrease_host_rr_pending(s);
1123 static void register_hinfo(AvahiServer *s) {
1124 struct utsname utsname;
1129 if (!s->config.publish_hinfo)
1132 if (s->hinfo_entry_group)
1133 assert(avahi_s_entry_group_is_empty(s->hinfo_entry_group));
1135 s->hinfo_entry_group = avahi_s_entry_group_new(s, avahi_host_rr_entry_group_callback, NULL);
1137 if (!s->hinfo_entry_group) {
1138 avahi_log_warn("Failed to create HINFO entry group: %s", avahi_strerror(s->error));
1142 /* Fill in HINFO rr */
1143 if ((r = avahi_record_new_full(s->host_name_fqdn, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_HINFO, AVAHI_DEFAULT_TTL_HOST_NAME))) {
1145 if (uname(&utsname) < 0)
1146 avahi_log_warn("uname() failed: %s\n", avahi_strerror(errno));
1149 r->data.hinfo.cpu = avahi_strdup(avahi_strup(utsname.machine));
1150 r->data.hinfo.os = avahi_strdup(avahi_strup(utsname.sysname));
1152 avahi_log_info("Registering HINFO record with values '%s'/'%s'.", r->data.hinfo.cpu, r->data.hinfo.os);
1154 if (avahi_server_add(s, s->hinfo_entry_group, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, AVAHI_PUBLISH_UNIQUE, r) < 0) {
1155 avahi_log_warn("Failed to add HINFO RR: %s", avahi_strerror(s->error));
1160 avahi_record_unref(r);
1163 if (avahi_s_entry_group_commit(s->hinfo_entry_group) < 0)
1164 avahi_log_warn("Failed to commit HINFO entry group: %s", avahi_strerror(s->error));
1168 static void register_localhost(AvahiServer *s) {
1172 /* Add localhost entries */
1173 avahi_address_parse("127.0.0.1", AVAHI_PROTO_INET, &a);
1174 avahi_server_add_address(s, NULL, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, AVAHI_PUBLISH_NO_PROBE|AVAHI_PUBLISH_NO_ANNOUNCE, "localhost", &a);
1176 avahi_address_parse("::1", AVAHI_PROTO_INET6, &a);
1177 avahi_server_add_address(s, NULL, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, AVAHI_PUBLISH_NO_PROBE|AVAHI_PUBLISH_NO_ANNOUNCE, "ip6-localhost", &a);
1180 static void register_browse_domain(AvahiServer *s) {
1183 if (!s->config.publish_domain)
1186 if (avahi_domain_equal(s->domain_name, "local"))
1189 if (s->browse_domain_entry_group)
1190 assert(avahi_s_entry_group_is_empty(s->browse_domain_entry_group));
1192 s->browse_domain_entry_group = avahi_s_entry_group_new(s, NULL, NULL);
1194 if (!s->browse_domain_entry_group) {
1195 avahi_log_warn("Failed to create browse domain entry group: %s", avahi_strerror(s->error));
1199 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) {
1200 avahi_log_warn("Failed to add browse domain RR: %s", avahi_strerror(s->error));
1204 if (avahi_s_entry_group_commit(s->browse_domain_entry_group) < 0)
1205 avahi_log_warn("Failed to commit browse domain entry group: %s", avahi_strerror(s->error));
1208 static void register_stuff(AvahiServer *s) {
1211 server_set_state(s, AVAHI_SERVER_REGISTERING);
1212 s->n_host_rr_pending ++; /** Make sure that the state isn't changed tp AVAHI_SERVER_RUNNING too early */
1215 register_browse_domain(s);
1216 avahi_interface_monitor_update_rrs(s->monitor, 0);
1218 assert(s->n_host_rr_pending > 0);
1219 s->n_host_rr_pending --;
1221 if (s->n_host_rr_pending == 0)
1222 server_set_state(s, AVAHI_SERVER_RUNNING);
1225 static void update_fqdn(AvahiServer *s) {
1229 assert(s->host_name);
1230 assert(s->domain_name);
1232 if (!(n = avahi_strdup_printf("%s.%s", s->host_name, s->domain_name)))
1235 avahi_free(s->host_name_fqdn);
1236 s->host_name_fqdn = n;
1239 int avahi_server_set_host_name(AvahiServer *s, const char *host_name) {
1243 AVAHI_CHECK_VALIDITY(s, !host_name || avahi_is_valid_host_name(host_name), AVAHI_ERR_INVALID_HOST_NAME);
1246 hn = avahi_get_host_name_strdup();
1248 hn = avahi_normalize_name_strdup(host_name);
1250 hn[strcspn(hn, ".")] = 0;
1252 if (avahi_domain_equal(s->host_name, hn) && s->state != AVAHI_SERVER_COLLISION) {
1254 return avahi_server_set_errno(s, AVAHI_ERR_NO_CHANGE);
1257 withdraw_host_rrs(s);
1259 avahi_free(s->host_name);
1268 int avahi_server_set_domain_name(AvahiServer *s, const char *domain_name) {
1272 AVAHI_CHECK_VALIDITY(s, !domain_name || avahi_is_valid_domain_name(domain_name), AVAHI_ERR_INVALID_DOMAIN_NAME);
1275 dn = avahi_strdup("local");
1277 dn = avahi_normalize_name_strdup(domain_name);
1279 if (avahi_domain_equal(s->domain_name, domain_name)) {
1281 return avahi_server_set_errno(s, AVAHI_ERR_NO_CHANGE);
1284 withdraw_host_rrs(s);
1286 avahi_free(s->domain_name);
1287 s->domain_name = dn;
1296 static int valid_server_config(const AvahiServerConfig *sc) {
1301 if (sc->n_wide_area_servers > AVAHI_WIDE_AREA_SERVERS_MAX)
1302 return AVAHI_ERR_INVALID_CONFIG;
1304 if (sc->host_name && !avahi_is_valid_host_name(sc->host_name))
1305 return AVAHI_ERR_INVALID_HOST_NAME;
1307 if (sc->domain_name && !avahi_is_valid_domain_name(sc->domain_name))
1308 return AVAHI_ERR_INVALID_DOMAIN_NAME;
1310 for (l = sc->browse_domains; l; l = l->next)
1311 if (!avahi_is_valid_domain_name((char*) l->text))
1312 return AVAHI_ERR_INVALID_DOMAIN_NAME;
1317 static int setup_sockets(AvahiServer *s) {
1320 s->fd_ipv4 = s->config.use_ipv4 ? avahi_open_socket_ipv4(s->config.disallow_other_stacks) : -1;
1321 s->fd_ipv6 = s->config.use_ipv6 ? avahi_open_socket_ipv6(s->config.disallow_other_stacks) : -1;
1323 if (s->fd_ipv6 < 0 && s->fd_ipv4 < 0)
1324 return AVAHI_ERR_NO_NETWORK;
1326 if (s->fd_ipv4 < 0 && s->config.use_ipv4)
1327 avahi_log_notice("Failed to create IPv4 socket, proceeding in IPv6 only mode");
1328 else if (s->fd_ipv6 < 0 && s->config.use_ipv6)
1329 avahi_log_notice("Failed to create IPv6 socket, proceeding in IPv4 only mode");
1331 s->fd_legacy_unicast_ipv4 = s->fd_ipv4 >= 0 && s->config.enable_reflector ? avahi_open_unicast_socket_ipv4() : -1;
1332 s->fd_legacy_unicast_ipv6 = s->fd_ipv6 >= 0 && s->config.enable_reflector ? avahi_open_unicast_socket_ipv6() : -1;
1336 s->watch_legacy_unicast_ipv4 =
1337 s->watch_legacy_unicast_ipv6 = NULL;
1339 if (s->fd_ipv4 >= 0)
1340 s->watch_ipv4 = s->poll_api->watch_new(s->poll_api, s->fd_ipv4, AVAHI_WATCH_IN, mcast_socket_event, s);
1341 if (s->fd_ipv6 >= 0)
1342 s->watch_ipv6 = s->poll_api->watch_new(s->poll_api, s->fd_ipv6, AVAHI_WATCH_IN, mcast_socket_event, s);
1344 if (s->fd_legacy_unicast_ipv4 >= 0)
1345 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);
1346 if (s->fd_legacy_unicast_ipv6 >= 0)
1347 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);
1352 AvahiServer *avahi_server_new(const AvahiPoll *poll_api, const AvahiServerConfig *sc, AvahiServerCallback callback, void* userdata, int *error) {
1356 if (sc && (e = valid_server_config(sc)) < 0) {
1362 if (!(s = avahi_new(AvahiServer, 1))) {
1364 *error = AVAHI_ERR_NO_MEMORY;
1369 s->poll_api = poll_api;
1372 avahi_server_config_copy(&s->config, sc);
1374 avahi_server_config_init(&s->config);
1376 if ((e = setup_sockets(s)) < 0) {
1380 avahi_server_config_free(&s->config);
1386 s->n_host_rr_pending = 0;
1387 s->need_entry_cleanup = 0;
1388 s->need_group_cleanup = 0;
1389 s->need_browser_cleanup = 0;
1390 s->cleanup_time_event = NULL;
1391 s->hinfo_entry_group = NULL;
1392 s->browse_domain_entry_group = NULL;
1393 s->error = AVAHI_OK;
1394 s->state = AVAHI_SERVER_INVALID;
1396 s->callback = callback;
1397 s->userdata = userdata;
1399 s->time_event_queue = avahi_time_event_queue_new(poll_api);
1401 s->entries_by_key = avahi_hashmap_new((AvahiHashFunc) avahi_key_hash, (AvahiEqualFunc) avahi_key_equal, NULL, NULL);
1402 AVAHI_LLIST_HEAD_INIT(AvahiEntry, s->entries);
1403 AVAHI_LLIST_HEAD_INIT(AvahiGroup, s->groups);
1405 s->record_browser_hashmap = avahi_hashmap_new((AvahiHashFunc) avahi_key_hash, (AvahiEqualFunc) avahi_key_equal, NULL, NULL);
1406 AVAHI_LLIST_HEAD_INIT(AvahiSRecordBrowser, s->record_browsers);
1407 AVAHI_LLIST_HEAD_INIT(AvahiSHostNameResolver, s->host_name_resolvers);
1408 AVAHI_LLIST_HEAD_INIT(AvahiSAddressResolver, s->address_resolvers);
1409 AVAHI_LLIST_HEAD_INIT(AvahiSDomainBrowser, s->domain_browsers);
1410 AVAHI_LLIST_HEAD_INIT(AvahiSServiceTypeBrowser, s->service_type_browsers);
1411 AVAHI_LLIST_HEAD_INIT(AvahiSServiceBrowser, s->service_browsers);
1412 AVAHI_LLIST_HEAD_INIT(AvahiSServiceResolver, s->service_resolvers);
1413 AVAHI_LLIST_HEAD_INIT(AvahiSDNSServerBrowser, s->dns_server_browsers);
1415 s->legacy_unicast_reflect_slots = NULL;
1416 s->legacy_unicast_reflect_id = 0;
1418 s->record_list = avahi_record_list_new();
1421 s->host_name = s->config.host_name ? avahi_normalize_name_strdup(s->config.host_name) : avahi_get_host_name_strdup();
1422 s->host_name[strcspn(s->host_name, ".")] = 0;
1423 s->domain_name = s->config.domain_name ? avahi_normalize_name_strdup(s->config.domain_name) : avahi_strdup("local");
1424 s->host_name_fqdn = NULL;
1428 s->local_service_cookie = (uint32_t) rand() * (uint32_t) rand();
1429 } while (s->local_service_cookie == AVAHI_SERVICE_COOKIE_INVALID);
1431 if (s->config.enable_wide_area) {
1432 s->wide_area_lookup_engine = avahi_wide_area_engine_new(s);
1433 avahi_wide_area_set_servers(s->wide_area_lookup_engine, s->config.wide_area_servers, s->config.n_wide_area_servers);
1435 s->wide_area_lookup_engine = NULL;
1437 s->multicast_lookup_engine = avahi_multicast_lookup_engine_new(s);
1439 s->monitor = avahi_interface_monitor_new(s);
1440 avahi_interface_monitor_sync(s->monitor);
1442 register_localhost(s);
1448 void avahi_server_free(AvahiServer* s) {
1451 /* Remove all browsers */
1453 while (s->dns_server_browsers)
1454 avahi_s_dns_server_browser_free(s->dns_server_browsers);
1455 while (s->host_name_resolvers)
1456 avahi_s_host_name_resolver_free(s->host_name_resolvers);
1457 while (s->address_resolvers)
1458 avahi_s_address_resolver_free(s->address_resolvers);
1459 while (s->domain_browsers)
1460 avahi_s_domain_browser_free(s->domain_browsers);
1461 while (s->service_type_browsers)
1462 avahi_s_service_type_browser_free(s->service_type_browsers);
1463 while (s->service_browsers)
1464 avahi_s_service_browser_free(s->service_browsers);
1465 while (s->service_resolvers)
1466 avahi_s_service_resolver_free(s->service_resolvers);
1467 while (s->record_browsers)
1468 avahi_s_record_browser_destroy(s->record_browsers);
1470 /* Remove all locally rgeistered stuff */
1473 avahi_entry_free(s, s->entries);
1475 avahi_interface_monitor_free(s->monitor);
1478 avahi_entry_group_free(s, s->groups);
1482 avahi_hashmap_free(s->entries_by_key);
1483 avahi_record_list_free(s->record_list);
1484 avahi_hashmap_free(s->record_browser_hashmap);
1486 if (s->wide_area_lookup_engine)
1487 avahi_wide_area_engine_free(s->wide_area_lookup_engine);
1488 avahi_multicast_lookup_engine_free(s->multicast_lookup_engine);
1490 if (s->cleanup_time_event)
1491 avahi_time_event_free(s->cleanup_time_event);
1493 avahi_time_event_queue_free(s->time_event_queue);
1498 s->poll_api->watch_free(s->watch_ipv4);
1500 s->poll_api->watch_free(s->watch_ipv6);
1502 if (s->watch_legacy_unicast_ipv4)
1503 s->poll_api->watch_free(s->watch_legacy_unicast_ipv4);
1504 if (s->watch_legacy_unicast_ipv6)
1505 s->poll_api->watch_free(s->watch_legacy_unicast_ipv6);
1509 if (s->fd_ipv4 >= 0)
1511 if (s->fd_ipv6 >= 0)
1514 if (s->fd_legacy_unicast_ipv4 >= 0)
1515 close(s->fd_legacy_unicast_ipv4);
1516 if (s->fd_legacy_unicast_ipv6 >= 0)
1517 close(s->fd_legacy_unicast_ipv6);
1519 /* Free other stuff */
1521 avahi_free(s->host_name);
1522 avahi_free(s->domain_name);
1523 avahi_free(s->host_name_fqdn);
1525 avahi_server_config_free(&s->config);
1530 const char* avahi_server_get_domain_name(AvahiServer *s) {
1533 return s->domain_name;
1536 const char* avahi_server_get_host_name(AvahiServer *s) {
1539 return s->host_name;
1542 const char* avahi_server_get_host_name_fqdn(AvahiServer *s) {
1545 return s->host_name_fqdn;
1548 void* avahi_server_get_data(AvahiServer *s) {
1554 void avahi_server_set_data(AvahiServer *s, void* userdata) {
1557 s->userdata = userdata;
1560 AvahiServerState avahi_server_get_state(AvahiServer *s) {
1566 AvahiServerConfig* avahi_server_config_init(AvahiServerConfig *c) {
1569 memset(c, 0, sizeof(AvahiServerConfig));
1572 c->allow_interfaces = NULL;
1573 c->deny_interfaces = NULL;
1574 c->host_name = NULL;
1575 c->domain_name = NULL;
1576 c->check_response_ttl = 0;
1577 c->publish_hinfo = 1;
1578 c->publish_addresses = 1;
1579 c->publish_workstation = 1;
1580 c->publish_domain = 1;
1581 c->use_iff_running = 0;
1582 c->enable_reflector = 0;
1584 c->add_service_cookie = 0;
1585 c->enable_wide_area = 0;
1586 c->n_wide_area_servers = 0;
1587 c->disallow_other_stacks = 0;
1588 c->browse_domains = NULL;
1589 c->disable_publishing = 0;
1590 c->allow_point_to_point = 0;
1591 c->publish_aaaa_on_ipv4 = 1;
1592 c->publish_a_on_ipv6 = 0;
1593 c->n_cache_entries_max = AVAHI_DEFAULT_CACHE_ENTRIES_MAX;
1594 c->ratelimit_interval = 0;
1595 c->ratelimit_burst = 0;
1600 void avahi_server_config_free(AvahiServerConfig *c) {
1603 avahi_free(c->host_name);
1604 avahi_free(c->domain_name);
1605 avahi_string_list_free(c->browse_domains);
1606 avahi_string_list_free(c->allow_interfaces);
1607 avahi_string_list_free(c->deny_interfaces);
1610 AvahiServerConfig* avahi_server_config_copy(AvahiServerConfig *ret, const AvahiServerConfig *c) {
1611 char *d = NULL, *h = NULL;
1612 AvahiStringList *browse = NULL, *allow = NULL, *deny = NULL;
1617 if (!(h = avahi_strdup(c->host_name)))
1621 if (!(d = avahi_strdup(c->domain_name))) {
1626 if (!(browse = avahi_string_list_copy(c->browse_domains)) && c->browse_domains) {
1632 if (!(allow = avahi_string_list_copy(c->allow_interfaces)) && c->allow_interfaces) {
1633 avahi_string_list_free(browse);
1639 if (!(deny = avahi_string_list_copy(c->deny_interfaces)) && c->deny_interfaces) {
1640 avahi_string_list_free(allow);
1641 avahi_string_list_free(browse);
1649 ret->domain_name = d;
1650 ret->browse_domains = browse;
1651 ret->allow_interfaces = allow;
1652 ret->deny_interfaces = deny;
1657 int avahi_server_errno(AvahiServer *s) {
1663 /* Just for internal use */
1664 int avahi_server_set_errno(AvahiServer *s, int error) {
1667 return s->error = error;
1670 uint32_t avahi_server_get_local_service_cookie(AvahiServer *s) {
1673 return s->local_service_cookie;
1676 static AvahiEntry *find_entry(AvahiServer *s, AvahiIfIndex interface, AvahiProtocol protocol, AvahiKey *key) {
1682 for (e = avahi_hashmap_lookup(s->entries_by_key, key); e; e = e->by_key_next)
1684 if ((e->interface == interface || e->interface <= 0 || interface <= 0) &&
1685 (e->protocol == protocol || e->protocol == AVAHI_PROTO_UNSPEC || protocol == AVAHI_PROTO_UNSPEC) &&
1686 (!e->group || e->group->state == AVAHI_ENTRY_GROUP_ESTABLISHED || e->group->state == AVAHI_ENTRY_GROUP_REGISTERING))
1693 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) {
1694 AvahiKey *key = NULL;
1697 char n[AVAHI_DOMAIN_NAME_MAX];
1704 AVAHI_CHECK_VALIDITY(s, AVAHI_IF_VALID(interface), AVAHI_ERR_INVALID_INTERFACE);
1705 AVAHI_CHECK_VALIDITY(s, AVAHI_PROTO_VALID(protocol), AVAHI_ERR_INVALID_PROTOCOL);
1706 AVAHI_CHECK_VALIDITY(s, avahi_is_valid_service_name(name), AVAHI_ERR_INVALID_SERVICE_NAME);
1707 AVAHI_CHECK_VALIDITY(s, avahi_is_valid_service_type_strict(type), AVAHI_ERR_INVALID_SERVICE_TYPE);
1708 AVAHI_CHECK_VALIDITY(s, !domain || avahi_is_valid_domain_name(domain), AVAHI_ERR_INVALID_DOMAIN_NAME);
1710 if ((ret = avahi_service_name_join(n, sizeof(n), name, type, domain) < 0))
1711 return avahi_server_set_errno(s, ret);
1713 if (!(key = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV)))
1714 return avahi_server_set_errno(s, AVAHI_ERR_NO_MEMORY);
1716 e = find_entry(s, interface, protocol, key);
1717 avahi_key_unref(key);
1720 *ret_group = e->group;
1724 return avahi_server_set_errno(s, AVAHI_ERR_NOT_FOUND);
1727 int avahi_server_is_service_local(AvahiServer *s, AvahiIfIndex interface, AvahiProtocol protocol, const char *name) {
1728 AvahiKey *key = NULL;
1734 if (!s->host_name_fqdn)
1737 if (!(key = avahi_key_new(name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV)))
1740 e = find_entry(s, interface, protocol, key);
1741 avahi_key_unref(key);
1746 return avahi_domain_equal(s->host_name_fqdn, e->record->data.srv.name);
1749 int avahi_server_is_record_local(AvahiServer *s, AvahiIfIndex interface, AvahiProtocol protocol, AvahiRecord *record) {
1755 for (e = avahi_hashmap_lookup(s->entries_by_key, record->key); e; e = e->by_key_next)
1757 if ((e->interface == interface || e->interface <= 0 || interface <= 0) &&
1758 (e->protocol == protocol || e->protocol == AVAHI_PROTO_UNSPEC || protocol == AVAHI_PROTO_UNSPEC) &&
1759 (!e->group || e->group->state == AVAHI_ENTRY_GROUP_ESTABLISHED || e->group->state == AVAHI_ENTRY_GROUP_REGISTERING) &&
1760 avahi_record_equal_no_ttl(record, e->record))
1766 /** Set the wide area DNS servers */
1767 int avahi_server_set_wide_area_servers(AvahiServer *s, const AvahiAddress *a, unsigned n) {
1770 if (!s->wide_area_lookup_engine)
1771 return avahi_server_set_errno(s, AVAHI_ERR_INVALID_CONFIG);
1773 avahi_wide_area_set_servers(s->wide_area_lookup_engine, a, n);
1777 const AvahiServerConfig* avahi_server_get_config(AvahiServer *s) {
1783 /** Set the browsing domains */
1784 int avahi_server_set_browse_domains(AvahiServer *s, AvahiStringList *domains) {
1789 for (l = s->config.browse_domains; l; l = l->next)
1790 if (!avahi_is_valid_domain_name((char*) l->text))
1791 return avahi_server_set_errno(s, AVAHI_ERR_INVALID_DOMAIN_NAME);
1793 avahi_string_list_free(s->config.browse_domains);
1794 s->config.browse_domains = avahi_string_list_copy(domains);