4 This file is part of avahi.
6 avahi is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as
8 published by the Free Software Foundation; either version 2.1 of the
9 License, or (at your option) any later version.
11 avahi is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
14 Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with avahi; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
26 #include <sys/socket.h>
27 #include <arpa/inet.h>
29 #include <sys/utsname.h>
38 #define AVAHI_HOST_RR_HOLDOFF_MSEC 1000
40 static void free_entry(AvahiServer*s, AvahiEntry *e) {
46 avahi_goodbye_entry(s, e, TRUE);
48 /* Remove from linked list */
49 AVAHI_LLIST_REMOVE(AvahiEntry, entries, s->entries, e);
51 /* Remove from hash table indexed by name */
52 t = g_hash_table_lookup(s->entries_by_key, e->record->key);
53 AVAHI_LLIST_REMOVE(AvahiEntry, by_key, t, e);
55 g_hash_table_replace(s->entries_by_key, t->record->key, t);
57 g_hash_table_remove(s->entries_by_key, e->record->key);
59 /* Remove from associated group */
61 AVAHI_LLIST_REMOVE(AvahiEntry, by_group, e->group->entries, e);
63 avahi_record_unref(e->record);
67 static void free_group(AvahiServer *s, AvahiEntryGroup *g) {
72 free_entry(s, g->entries);
74 AVAHI_LLIST_REMOVE(AvahiEntryGroup, groups, s->groups, g);
78 static void cleanup_dead(AvahiServer *s) {
79 AvahiEntryGroup *g, *ng;
84 if (s->need_group_cleanup) {
85 for (g = s->groups; g; g = ng) {
92 s->need_group_cleanup = FALSE;
95 if (s->need_entry_cleanup) {
96 for (e = s->entries; e; e = ne) {
103 s->need_entry_cleanup = FALSE;
106 if (s->need_browser_cleanup)
107 avahi_browser_cleanup(s);
110 static void enum_aux_records(AvahiServer *s, AvahiInterface *i, const gchar *name, guint16 type, void (*callback)(AvahiServer *s, AvahiRecord *r, gboolean flush_cache, gpointer userdata), gpointer userdata) {
119 g_assert(type != AVAHI_DNS_TYPE_ANY);
121 k = avahi_key_new(name, AVAHI_DNS_CLASS_IN, type);
123 for (e = g_hash_table_lookup(s->entries_by_key, k); e; e = e->by_key_next)
124 if (!e->dead && avahi_entry_registered(s, e, i))
125 callback(s, e->record, e->flags & AVAHI_ENTRY_UNIQUE, userdata);
130 void avahi_server_enumerate_aux_records(AvahiServer *s, AvahiInterface *i, AvahiRecord *r, void (*callback)(AvahiServer *s, AvahiRecord *r, gboolean flush_cache, gpointer userdata), gpointer userdata) {
136 if (r->key->class == AVAHI_DNS_CLASS_IN) {
137 if (r->key->type == AVAHI_DNS_TYPE_PTR) {
138 enum_aux_records(s, i, r->data.ptr.name, AVAHI_DNS_TYPE_SRV, callback, userdata);
139 enum_aux_records(s, i, r->data.ptr.name, AVAHI_DNS_TYPE_TXT, callback, userdata);
140 } else if (r->key->type == AVAHI_DNS_TYPE_SRV) {
141 enum_aux_records(s, i, r->data.srv.name, AVAHI_DNS_TYPE_A, callback, userdata);
142 enum_aux_records(s, i, r->data.srv.name, AVAHI_DNS_TYPE_AAAA, callback, userdata);
147 void avahi_server_prepare_response(AvahiServer *s, AvahiInterface *i, AvahiEntry *e, gboolean unicast_response, gboolean auxiliary) {
152 avahi_record_list_push(s->record_list, e->record, e->flags & AVAHI_ENTRY_UNIQUE, unicast_response, auxiliary);
155 void avahi_server_prepare_matching_responses(AvahiServer *s, AvahiInterface *i, AvahiKey *k, gboolean unicast_response) {
163 /* g_message("Posting responses matching [%s]", txt = avahi_key_to_string(k)); */
166 if (avahi_key_is_pattern(k)) {
168 /* Handle ANY query */
170 for (e = s->entries; e; e = e->entries_next)
171 if (!e->dead && avahi_key_pattern_match(k, e->record->key) && avahi_entry_registered(s, e, i))
172 avahi_server_prepare_response(s, i, e, unicast_response, FALSE);
176 /* Handle all other queries */
178 for (e = g_hash_table_lookup(s->entries_by_key, k); e; e = e->by_key_next)
179 if (!e->dead && avahi_entry_registered(s, e, i))
180 avahi_server_prepare_response(s, i, e, unicast_response, FALSE);
184 static void withdraw_entry(AvahiServer *s, AvahiEntry *e) {
191 for (k = e->group->entries; k; k = k->by_group_next) {
192 avahi_goodbye_entry(s, k, FALSE);
196 avahi_entry_group_change_state(e->group, AVAHI_ENTRY_GROUP_COLLISION);
198 avahi_goodbye_entry(s, e, FALSE);
202 s->need_entry_cleanup = TRUE;
205 static void withdraw_rrset(AvahiServer *s, AvahiKey *key) {
211 for (e = g_hash_table_lookup(s->entries_by_key, key); e; e = e->by_key_next)
212 withdraw_entry(s, e);
215 static void incoming_probe(AvahiServer *s, AvahiRecord *record, AvahiInterface *i) {
218 gboolean ours = FALSE, won = FALSE, lost = FALSE;
224 for (e = g_hash_table_lookup(s->entries_by_key, record->key); e; e = n) {
228 if (e->dead || !avahi_entry_probing(s, e, i))
231 if ((cmp = avahi_record_lexicographical_compare(e->record, record)) == 0) {
240 t = avahi_record_to_string(record);
245 g_message("Recieved conflicting probe [%s]. Local host won.", t);
247 g_message("Recieved conflicting probe [%s]. Local host lost. Withdrawing.", t);
248 withdraw_rrset(s, record->key);
255 static gboolean handle_conflict(AvahiServer *s, AvahiInterface *i, AvahiRecord *record, gboolean unique, const AvahiAddress *a) {
256 gboolean valid = TRUE, ours = FALSE, conflict = FALSE, withdraw_immediately = FALSE;
257 AvahiEntry *e, *n, *conflicting_entry = NULL;
264 /* g_message("CHECKING FOR CONFLICT: [%s]", t); */
266 for (e = g_hash_table_lookup(s->entries_by_key, record->key); e; e = n) {
269 if (e->dead || (!(e->flags & AVAHI_ENTRY_UNIQUE) && !unique))
272 /* Either our entry or the other is intended to be unique, so let's check */
274 if (avahi_entry_registered(s, e, i)) {
276 if (avahi_record_equal_no_ttl(e->record, record)) {
277 ours = TRUE; /* We have an identical record, so this is no conflict */
279 /* Check wheter there is a TTL conflict */
280 if (record->ttl <= e->record->ttl/2) {
283 t = avahi_record_to_string(record);
285 g_message("Recieved record with bad TTL [%s]. Refreshing.", t);
286 avahi_server_prepare_matching_responses(s, i, e->record->key, FALSE);
292 /* There's no need to check the other entries of this RRset */
295 /* A conflict => we have to return to probe mode */
297 conflicting_entry = e;
300 } else if (avahi_entry_probing(s, e, i)) {
302 if (!avahi_record_equal_no_ttl(record, e->record)) {
304 /* We are currently registering a matching record, but
305 * someone else already claimed it, so let's
308 withdraw_immediately = TRUE;
313 /* g_message("ours=%i conflict=%i", ours, conflict); */
315 if (!ours && conflict) {
320 t = avahi_record_to_string(record);
322 if (withdraw_immediately) {
323 g_message("Recieved conflicting record [%s] with local record to be. Withdrawing.", t);
324 withdraw_rrset(s, record->key);
326 g_assert(conflicting_entry);
327 g_message("Recieved conflicting record [%s]. Resetting our record.", t);
328 avahi_entry_return_to_initial_state(s, conflicting_entry, i);
330 /* Local unique records are returned to probin
331 * state. Local shared records are reannounced. */
340 static void append_aux_callback(AvahiServer *s, AvahiRecord *r, gboolean flush_cache, gpointer userdata) {
341 gboolean *unicast_response = userdata;
345 g_assert(unicast_response);
347 avahi_record_list_push(s->record_list, r, flush_cache, *unicast_response, TRUE);
350 static void append_aux_records_to_list(AvahiServer *s, AvahiInterface *i, AvahiRecord *r, gboolean unicast_response) {
354 avahi_server_enumerate_aux_records(s, i, r, append_aux_callback, &unicast_response);
357 void avahi_server_generate_response(AvahiServer *s, AvahiInterface *i, AvahiDnsPacket *p, const AvahiAddress *a, guint16 port, gboolean legacy_unicast) {
361 g_assert(!legacy_unicast || (a && port > 0 && p));
363 if (legacy_unicast) {
364 AvahiDnsPacket *reply;
367 reply = avahi_dns_packet_new_reply(p, 512 /* unicast DNS maximum packet size is 512 */ , TRUE, TRUE);
369 while ((r = avahi_record_list_next(s->record_list, NULL, NULL, NULL))) {
371 append_aux_records_to_list(s, i, r, FALSE);
373 if (avahi_dns_packet_append_record(reply, r, FALSE, 10))
374 avahi_dns_packet_inc_field(reply, AVAHI_DNS_FIELD_ANCOUNT);
376 gchar *t = avahi_record_to_string(r);
377 g_warning("Record [%s] not fitting in legacy unicast packet, dropping.", t);
381 avahi_record_unref(r);
384 if (avahi_dns_packet_get_field(reply, AVAHI_DNS_FIELD_ANCOUNT) != 0)
385 avahi_interface_send_packet_unicast(i, reply, a, port);
387 avahi_dns_packet_free(reply);
390 gboolean unicast_response, flush_cache, auxiliary;
391 AvahiDnsPacket *reply = NULL;
394 /* In case the query packet was truncated never respond
395 immediately, because known answer suppression records might be
396 contained in later packets */
397 gboolean tc = p && !!(avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_FLAGS) & AVAHI_DNS_FLAG_TC);
399 while ((r = avahi_record_list_next(s->record_list, &flush_cache, &unicast_response, &auxiliary))) {
401 if (!avahi_interface_post_response(i, r, flush_cache, a, !tc && flush_cache && !auxiliary) && unicast_response) {
403 append_aux_records_to_list(s, i, r, unicast_response);
405 /* Due to some reasons the record has not been scheduled.
406 * The client requested an unicast response in that
407 * case. Therefore we prepare such a response */
413 reply = avahi_dns_packet_new_reply(p, i->hardware->mtu, FALSE, FALSE);
416 if (avahi_dns_packet_append_record(reply, r, flush_cache, 0)) {
418 /* Appending this record succeeded, so incremeant
419 * the specific header field, and return to the caller */
421 avahi_dns_packet_inc_field(reply, AVAHI_DNS_FIELD_ANCOUNT);
426 if (avahi_dns_packet_get_field(reply, AVAHI_DNS_FIELD_ANCOUNT) == 0) {
429 /* The record is too large for one packet, so create a larger packet */
431 avahi_dns_packet_free(reply);
432 size = avahi_record_get_estimate_size(r) + AVAHI_DNS_PACKET_HEADER_SIZE;
433 if (size > AVAHI_DNS_PACKET_MAX_SIZE)
434 size = AVAHI_DNS_PACKET_MAX_SIZE;
435 reply = avahi_dns_packet_new_reply(p, size, FALSE, TRUE);
437 if (!avahi_dns_packet_append_record(reply, r, flush_cache, 0)) {
438 avahi_dns_packet_free(reply);
440 gchar *t = avahi_record_to_string(r);
441 g_warning("Record [%s] too large, doesn't fit in any packet!", t);
445 avahi_dns_packet_inc_field(reply, AVAHI_DNS_FIELD_ANCOUNT);
448 /* Appending the record didn't succeeed, so let's send this packet, and create a new one */
449 avahi_interface_send_packet_unicast(i, reply, a, port);
450 avahi_dns_packet_free(reply);
455 avahi_record_unref(r);
459 if (avahi_dns_packet_get_field(reply, AVAHI_DNS_FIELD_ANCOUNT) != 0)
460 avahi_interface_send_packet_unicast(i, reply, a, port);
461 avahi_dns_packet_free(reply);
465 avahi_record_list_flush(s->record_list);
469 static void reflect_response(AvahiServer *s, AvahiInterface *i, AvahiRecord *r, gboolean flush_cache) {
476 if (!s->config.enable_reflector)
479 for (j = s->monitor->interfaces; j; j = j->interface_next)
481 avahi_interface_post_response(j, r, flush_cache, NULL, TRUE);
484 static void reflect_query(AvahiServer *s, AvahiInterface *i, AvahiKey *k) {
491 if (!s->config.enable_reflector)
494 for (j = s->monitor->interfaces; j; j = j->interface_next)
496 avahi_interface_post_query(j, k, TRUE);
499 static void reflect_probe(AvahiServer *s, AvahiInterface *i, AvahiRecord *r) {
506 if (!s->config.enable_reflector)
509 for (j = s->monitor->interfaces; j; j = j->interface_next)
511 avahi_interface_post_probe(j, r, TRUE);
514 static void handle_query(AvahiServer *s, AvahiDnsPacket *p, AvahiInterface *i, const AvahiAddress *a, guint16 port, gboolean legacy_unicast) {
522 /* g_message("query"); */
524 g_assert(avahi_record_list_empty(s->record_list));
526 /* Handle the questions */
527 for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_QDCOUNT); n > 0; n --) {
529 gboolean unicast_response = FALSE;
531 if (!(key = avahi_dns_packet_consume_key(p, &unicast_response))) {
532 g_warning("Packet too short (1)");
536 reflect_query(s, i, key);
537 avahi_query_scheduler_incoming(i->query_scheduler, key);
538 avahi_server_prepare_matching_responses(s, i, key, unicast_response);
539 avahi_key_unref(key);
542 /* Known Answer Suppression */
543 for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT); n > 0; n --) {
545 gboolean unique = FALSE;
547 if (!(record = avahi_dns_packet_consume_record(p, &unique))) {
548 g_warning("Packet too short (2)");
552 if (handle_conflict(s, i, record, unique, a)) {
553 avahi_response_scheduler_suppress(i->response_scheduler, record, a);
554 avahi_record_list_drop(s->record_list, record);
557 avahi_record_unref(record);
561 for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT); n > 0; n --) {
563 gboolean unique = FALSE;
565 if (!(record = avahi_dns_packet_consume_record(p, &unique))) {
566 g_warning("Packet too short (3)");
570 if (record->key->type != AVAHI_DNS_TYPE_ANY) {
571 reflect_probe(s, i, record);
572 incoming_probe(s, record, i);
575 avahi_record_unref(record);
578 if (!avahi_record_list_empty(s->record_list))
579 avahi_server_generate_response(s, i, p, a, port, legacy_unicast);
584 avahi_record_list_flush(s->record_list);
588 static void handle_response(AvahiServer *s, AvahiDnsPacket *p, AvahiInterface *i, const AvahiAddress *a) {
596 /* g_message("response"); */
598 for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) +
599 avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ARCOUNT); n > 0; n--) {
601 gboolean cache_flush = FALSE;
604 if (!(record = avahi_dns_packet_consume_record(p, &cache_flush))) {
605 g_warning("Packet too short (4)");
609 if (record->key->type != AVAHI_DNS_TYPE_ANY) {
611 /* g_message("Handling response: %s", txt = avahi_record_to_string(record)); */
614 if (handle_conflict(s, i, record, cache_flush, a)) {
615 reflect_response(s, i, record, cache_flush);
616 avahi_cache_update(i->cache, record, cache_flush, a);
617 avahi_response_scheduler_incoming(i->response_scheduler, record, cache_flush);
621 avahi_record_unref(record);
625 static void dispatch_packet(AvahiServer *s, AvahiDnsPacket *p, struct sockaddr *sa, gint iface, gint ttl) {
635 if (!(i = avahi_interface_monitor_get_interface(s->monitor, iface, sa->sa_family)) ||
636 !avahi_interface_relevant(i)) {
637 g_warning("Recieved packet from invalid interface.");
641 /* g_message("new packet recieved on interface '%s.%i'.", i->hardware->name, i->protocol); */
643 if (sa->sa_family == AF_INET6) {
644 static const guint8 ipv4_in_ipv6[] = {
645 0x00, 0x00, 0x00, 0x00,
646 0x00, 0x00, 0x00, 0x00,
647 0xFF, 0xFF, 0xFF, 0xFF };
649 /* This is an IPv4 address encapsulated in IPv6, so let's ignore it. */
651 if (memcmp(((struct sockaddr_in6*) sa)->sin6_addr.s6_addr, ipv4_in_ipv6, sizeof(ipv4_in_ipv6)) == 0)
655 if (avahi_dns_packet_check_valid(p) < 0) {
656 g_warning("Recieved invalid packet.");
660 port = avahi_port_from_sockaddr(sa);
661 avahi_address_from_sockaddr(sa, &a);
663 if (avahi_dns_packet_is_query(p)) {
664 gboolean legacy_unicast = FALSE;
666 if (avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ARCOUNT) != 0) {
667 g_warning("Invalid query packet.");
671 if (port != AVAHI_MDNS_PORT) {
674 if ((avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) != 0 ||
675 avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT) != 0)) {
676 g_warning("Invalid legacy unicast query packet.");
680 legacy_unicast = TRUE;
683 handle_query(s, p, i, &a, port, legacy_unicast);
685 /* g_message("Handled query"); */
688 if (port != AVAHI_MDNS_PORT) {
689 g_warning("Recieved repsonse with invalid source port %u on interface '%s.%i'", port, i->hardware->name, i->protocol);
694 g_warning("Recieved response with invalid TTL %u on interface '%s.%i'.", ttl, i->hardware->name, i->protocol);
695 if (s->config.check_response_ttl)
699 if (avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_QDCOUNT) != 0 ||
700 avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) == 0 ||
701 avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT) != 0) {
702 g_warning("Invalid response packet.");
706 handle_response(s, p, i, &a);
707 /* g_message("Handled response"); */
711 static void work(AvahiServer *s) {
712 struct sockaddr_in6 sa6;
713 struct sockaddr_in sa;
720 if (s->pollfd_ipv4.revents & G_IO_IN) {
721 if ((p = avahi_recv_dns_packet_ipv4(s->fd_ipv4, &sa, &iface, &ttl))) {
722 dispatch_packet(s, p, (struct sockaddr*) &sa, iface, ttl);
723 avahi_dns_packet_free(p);
727 if (s->pollfd_ipv6.revents & G_IO_IN) {
728 if ((p = avahi_recv_dns_packet_ipv6(s->fd_ipv6, &sa6, &iface, &ttl))) {
729 dispatch_packet(s, p, (struct sockaddr*) &sa6, iface, ttl);
730 avahi_dns_packet_free(p);
735 static gboolean prepare_func(GSource *source, gint *timeout) {
743 static gboolean check_func(GSource *source) {
747 s = *((AvahiServer**) (((guint8*) source) + sizeof(GSource)));
750 return (s->pollfd_ipv4.revents | s->pollfd_ipv6.revents) & (G_IO_IN | G_IO_HUP | G_IO_ERR);
753 static gboolean dispatch_func(GSource *source, GSourceFunc callback, gpointer user_data) {
757 s = *((AvahiServer**) (((guint8*) source) + sizeof(GSource)));
766 static void server_set_state(AvahiServer *s, AvahiServerState state) {
769 if (s->state == state)
775 s->callback(s, state, s->userdata);
778 static void withdraw_host_rrs(AvahiServer *s) {
781 if (s->hinfo_entry_group) {
782 avahi_entry_group_free(s->hinfo_entry_group);
783 s->hinfo_entry_group = NULL;
786 if (s->browse_domain_entry_group) {
787 avahi_entry_group_free(s->browse_domain_entry_group);
788 s->browse_domain_entry_group = NULL;
791 avahi_update_host_rrs(s->monitor, TRUE);
792 s->n_host_rr_pending = 0;
795 void avahi_server_decrease_host_rr_pending(AvahiServer *s) {
798 g_assert(s->n_host_rr_pending > 0);
800 if (--s->n_host_rr_pending == 0)
801 server_set_state(s, AVAHI_SERVER_RUNNING);
804 void avahi_server_increase_host_rr_pending(AvahiServer *s) {
807 s->n_host_rr_pending ++;
810 void avahi_host_rr_entry_group_callback(AvahiServer *s, AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata) {
814 if (state == AVAHI_ENTRY_GROUP_REGISTERING &&
815 s->state == AVAHI_SERVER_REGISTERING)
816 avahi_server_increase_host_rr_pending(s);
817 else if (state == AVAHI_ENTRY_GROUP_COLLISION &&
818 (s->state == AVAHI_SERVER_REGISTERING || s->state == AVAHI_SERVER_RUNNING)) {
819 withdraw_host_rrs(s);
820 server_set_state(s, AVAHI_SERVER_COLLISION);
821 } else if (state == AVAHI_ENTRY_GROUP_ESTABLISHED &&
822 s->state == AVAHI_SERVER_REGISTERING)
823 avahi_server_decrease_host_rr_pending(s);
826 static void register_hinfo(AvahiServer *s) {
827 struct utsname utsname;
832 if (!s->config.register_hinfo || s->hinfo_entry_group)
835 s->hinfo_entry_group = avahi_entry_group_new(s, avahi_host_rr_entry_group_callback, NULL);
837 /* Fill in HINFO rr */
838 r = avahi_record_new_full(s->host_name_fqdn, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_HINFO);
840 r->data.hinfo.cpu = g_strdup(g_strup(utsname.machine));
841 r->data.hinfo.os = g_strdup(g_strup(utsname.sysname));
842 avahi_server_add(s, s->hinfo_entry_group, 0, AF_UNSPEC, AVAHI_ENTRY_UNIQUE, r);
843 avahi_record_unref(r);
845 avahi_entry_group_commit(s->hinfo_entry_group);
848 static void register_localhost(AvahiServer *s) {
852 /* Add localhost entries */
853 avahi_address_parse("127.0.0.1", AF_INET, &a);
854 avahi_server_add_address(s, NULL, 0, AF_UNSPEC, AVAHI_ENTRY_NOPROBE|AVAHI_ENTRY_NOANNOUNCE, "localhost", &a);
856 avahi_address_parse("::1", AF_INET6, &a);
857 avahi_server_add_address(s, NULL, 0, AF_UNSPEC, AVAHI_ENTRY_NOPROBE|AVAHI_ENTRY_NOANNOUNCE, "ip6-localhost", &a);
860 static void register_browse_domain(AvahiServer *s) {
863 if (!s->config.announce_domain || s->browse_domain_entry_group)
866 s->browse_domain_entry_group = avahi_entry_group_new(s, NULL, NULL);
867 avahi_server_add_ptr(s, s->browse_domain_entry_group, 0, AF_UNSPEC, 0, "_browse._dns-sd._udp.local", s->domain_name);
868 avahi_entry_group_commit(s->browse_domain_entry_group);
871 static void register_stuff(AvahiServer *s) {
874 server_set_state(s, AVAHI_SERVER_REGISTERING);
876 register_browse_domain(s);
877 avahi_update_host_rrs(s->monitor, FALSE);
879 if (s->n_host_rr_pending == 0)
880 server_set_state(s, AVAHI_SERVER_RUNNING);
883 static void update_fqdn(AvahiServer *s) {
886 g_assert(s->host_name);
887 g_assert(s->domain_name);
889 g_free(s->host_name_fqdn);
890 s->host_name_fqdn = g_strdup_printf("%s.%s", s->host_name, s->domain_name);
893 static void register_time_event_callback(AvahiTimeEvent *e, gpointer userdata) {
894 AvahiServer *s = userdata;
899 g_assert(e == s->register_time_event);
900 avahi_time_event_queue_remove(s->time_event_queue, s->register_time_event);
901 s->register_time_event = NULL;
903 if (s->state == AVAHI_SERVER_SLEEPING)
907 static void delayed_register_stuff(AvahiServer *s) {
912 avahi_elapse_time(&tv, AVAHI_HOST_RR_HOLDOFF_MSEC, 0);
914 if (s->register_time_event)
915 avahi_time_event_queue_update(s->time_event_queue, s->register_time_event, &tv);
917 s->register_time_event = avahi_time_event_queue_add(s->time_event_queue, &tv, register_time_event_callback, s);
920 void avahi_server_set_host_name(AvahiServer *s, const gchar *host_name) {
924 server_set_state(s, AVAHI_SERVER_SLEEPING);
925 withdraw_host_rrs(s);
927 g_free(s->host_name);
928 s->host_name = host_name ? avahi_normalize_name(host_name) : avahi_get_host_name();
929 s->host_name[strcspn(s->host_name, ".")] = 0;
932 delayed_register_stuff(s);
935 void avahi_server_set_domain_name(AvahiServer *s, const gchar *domain_name) {
937 g_assert(domain_name);
939 server_set_state(s, AVAHI_SERVER_SLEEPING);
940 withdraw_host_rrs(s);
942 g_free(s->domain_name);
943 s->domain_name = domain_name ? avahi_normalize_name(domain_name) : g_strdup("local.");
946 delayed_register_stuff(s);
949 AvahiServer *avahi_server_new(GMainContext *c, const AvahiServerConfig *sc, AvahiServerCallback callback, gpointer userdata) {
952 static GSourceFuncs source_funcs = {
961 s = g_new(AvahiServer, 1);
962 s->n_host_rr_pending = 0;
963 s->need_entry_cleanup = s->need_group_cleanup = s->need_browser_cleanup = FALSE;
966 avahi_server_config_copy(&s->config, sc);
968 avahi_server_config_init(&s->config);
970 s->fd_ipv4 = s->config.use_ipv4 ? avahi_open_socket_ipv4() : -1;
971 s->fd_ipv6 = s->config.use_ipv6 ? avahi_open_socket_ipv6() : -1;
973 if (s->fd_ipv6 < 0 && s->fd_ipv4 < 0) {
974 g_critical("Selected neither IPv6 nor IPv4 support, aborting.\n");
975 avahi_server_config_free(&s->config);
980 if (s->fd_ipv4 < 0 && s->config.use_ipv4)
981 g_message("Failed to create IPv4 socket, proceeding in IPv6 only mode");
982 else if (s->fd_ipv6 < 0 && s->config.use_ipv6)
983 g_message("Failed to create IPv6 socket, proceeding in IPv4 only mode");
986 g_main_context_ref(s->context = c);
988 s->context = g_main_context_default();
990 /* Prepare IO source registration */
991 s->source = g_source_new(&source_funcs, sizeof(GSource) + sizeof(AvahiServer*));
992 *((AvahiServer**) (((guint8*) s->source) + sizeof(GSource))) = s;
994 memset(&s->pollfd_ipv4, 0, sizeof(s->pollfd_ipv4));
995 s->pollfd_ipv4.fd = s->fd_ipv4;
996 s->pollfd_ipv4.events = G_IO_IN|G_IO_ERR|G_IO_HUP;
997 g_source_add_poll(s->source, &s->pollfd_ipv4);
999 memset(&s->pollfd_ipv6, 0, sizeof(s->pollfd_ipv6));
1000 s->pollfd_ipv6.fd = s->fd_ipv6;
1001 s->pollfd_ipv6.events = G_IO_IN|G_IO_ERR|G_IO_HUP;
1002 g_source_add_poll(s->source, &s->pollfd_ipv6);
1004 g_source_attach(s->source, s->context);
1006 s->callback = callback;
1007 s->userdata = userdata;
1009 AVAHI_LLIST_HEAD_INIT(AvahiEntry, s->entries);
1010 s->entries_by_key = g_hash_table_new((GHashFunc) avahi_key_hash, (GEqualFunc) avahi_key_equal);
1011 AVAHI_LLIST_HEAD_INIT(AvahiGroup, s->groups);
1013 AVAHI_LLIST_HEAD_INIT(AvahiRecordBrowser, s->record_browsers);
1014 s->record_browser_hashtable = g_hash_table_new((GHashFunc) avahi_key_hash, (GEqualFunc) avahi_key_equal);
1015 AVAHI_LLIST_HEAD_INIT(AvahiHostNameResolver, s->host_name_resolvers);
1016 AVAHI_LLIST_HEAD_INIT(AvahiAddressResolver, s->address_resolvers);
1017 AVAHI_LLIST_HEAD_INIT(AvahiDomainBrowser, s->domain_browsers);
1018 AVAHI_LLIST_HEAD_INIT(AvahiServiceTypeBrowser, s->service_type_browsers);
1019 AVAHI_LLIST_HEAD_INIT(AvahiServiceBrowser, s->service_browsers);
1020 AVAHI_LLIST_HEAD_INIT(AvahiServiceResolver, s->service_resolvers);
1023 s->host_name = s->config.host_name ? avahi_normalize_name(s->config.host_name) : avahi_get_host_name();
1024 s->host_name[strcspn(s->host_name, ".")] = 0;
1025 s->domain_name = s->config.domain_name ? avahi_normalize_name(s->config.domain_name) : g_strdup("local.");
1026 s->host_name_fqdn = NULL;
1029 s->record_list = avahi_record_list_new();
1031 s->time_event_queue = avahi_time_event_queue_new(s->context, G_PRIORITY_DEFAULT+10); /* Slightly less priority than the FDs */
1032 s->register_time_event = NULL;
1034 s->state = AVAHI_SERVER_INVALID;
1036 s->monitor = avahi_interface_monitor_new(s);
1037 avahi_interface_monitor_sync(s->monitor);
1039 register_localhost(s);
1041 s->hinfo_entry_group = NULL;
1042 s->browse_domain_entry_group = NULL;
1048 void avahi_server_free(AvahiServer* s) {
1052 free_entry(s, s->entries);
1054 avahi_interface_monitor_free(s->monitor);
1057 free_group(s, s->groups);
1059 while (s->host_name_resolvers)
1060 avahi_host_name_resolver_free(s->host_name_resolvers);
1061 while (s->address_resolvers)
1062 avahi_address_resolver_free(s->address_resolvers);
1063 while (s->domain_browsers)
1064 avahi_domain_browser_free(s->domain_browsers);
1065 while (s->service_type_browsers)
1066 avahi_service_type_browser_free(s->service_type_browsers);
1067 while (s->service_browsers)
1068 avahi_service_browser_free(s->service_browsers);
1069 while (s->service_resolvers)
1070 avahi_service_resolver_free(s->service_resolvers);
1071 while (s->record_browsers)
1072 avahi_record_browser_destroy(s->record_browsers);
1073 g_hash_table_destroy(s->record_browser_hashtable);
1075 g_hash_table_destroy(s->entries_by_key);
1077 if (s->register_time_event)
1078 avahi_time_event_queue_remove(s->time_event_queue, s->register_time_event);
1079 avahi_time_event_queue_free(s->time_event_queue);
1081 avahi_record_list_free(s->record_list);
1083 if (s->fd_ipv4 >= 0)
1085 if (s->fd_ipv6 >= 0)
1088 g_free(s->host_name);
1089 g_free(s->domain_name);
1090 g_free(s->host_name_fqdn);
1092 g_source_destroy(s->source);
1093 g_source_unref(s->source);
1094 g_main_context_unref(s->context);
1096 avahi_server_config_free(&s->config);
1101 void avahi_server_add(
1106 AvahiEntryFlags flags,
1113 g_assert(r->key->type != AVAHI_DNS_TYPE_ANY);
1115 e = g_new(AvahiEntry, 1);
1117 e->record = avahi_record_ref(r);
1119 e->interface = interface;
1120 e->protocol = protocol;
1124 AVAHI_LLIST_HEAD_INIT(AvahiAnnouncement, e->announcements);
1126 AVAHI_LLIST_PREPEND(AvahiEntry, entries, s->entries, e);
1128 /* Insert into hash table indexed by name */
1129 t = g_hash_table_lookup(s->entries_by_key, e->record->key);
1130 AVAHI_LLIST_PREPEND(AvahiEntry, by_key, t, e);
1131 g_hash_table_replace(s->entries_by_key, e->record->key, t);
1133 /* Insert into group list */
1135 AVAHI_LLIST_PREPEND(AvahiEntry, by_group, g->entries, e);
1137 avahi_announce_entry(s, e);
1139 const AvahiRecord *avahi_server_iterate(AvahiServer *s, AvahiEntryGroup *g, void **state) {
1140 AvahiEntry **e = (AvahiEntry**) state;
1145 *e = g ? g->entries : s->entries;
1147 while (*e && (*e)->dead)
1148 *e = g ? (*e)->by_group_next : (*e)->entries_next;
1153 return avahi_record_ref((*e)->record);
1156 void avahi_server_dump(AvahiServer *s, FILE *f) {
1161 fprintf(f, "\n;;; ZONE DUMP FOLLOWS ;;;\n");
1163 for (e = s->entries; e; e = e->entries_next) {
1169 t = avahi_record_to_string(e->record);
1170 fprintf(f, "%s ; iface=%i proto=%i\n", t, e->interface, e->protocol);
1174 avahi_dump_caches(s->monitor, f);
1177 void avahi_server_add_ptr(
1182 AvahiEntryFlags flags,
1184 const gchar *dest) {
1190 r = avahi_record_new_full(name ? name : s->host_name_fqdn, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_PTR);
1191 r->data.ptr.name = avahi_normalize_name(dest);
1192 avahi_server_add(s, g, interface, protocol, flags, r);
1193 avahi_record_unref(r);
1196 void avahi_server_add_address(
1201 AvahiEntryFlags flags,
1209 name = name ? (n = avahi_normalize_name(name)) : s->host_name_fqdn;
1211 if (a->family == AF_INET) {
1215 r = avahi_record_new_full(name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_A);
1216 r->data.a.address = a->data.ipv4;
1217 avahi_server_add(s, g, interface, protocol, flags | AVAHI_ENTRY_UNIQUE, r);
1218 avahi_record_unref(r);
1220 reverse = avahi_reverse_lookup_name_ipv4(&a->data.ipv4);
1221 avahi_server_add_ptr(s, g, interface, protocol, flags | AVAHI_ENTRY_UNIQUE, reverse, name);
1228 r = avahi_record_new_full(name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_AAAA);
1229 r->data.aaaa.address = a->data.ipv6;
1230 avahi_server_add(s, g, interface, protocol, flags | AVAHI_ENTRY_UNIQUE, r);
1231 avahi_record_unref(r);
1233 reverse = avahi_reverse_lookup_name_ipv6_arpa(&a->data.ipv6);
1234 avahi_server_add_ptr(s, g, interface, protocol, flags | AVAHI_ENTRY_UNIQUE, reverse, name);
1237 reverse = avahi_reverse_lookup_name_ipv6_int(&a->data.ipv6);
1238 avahi_server_add_ptr(s, g, interface, protocol, flags | AVAHI_ENTRY_UNIQUE, reverse, name);
1245 void avahi_server_add_text_strlst(
1250 AvahiEntryFlags flags,
1252 AvahiStringList *strlst) {
1258 r = avahi_record_new_full(name ? name : s->host_name_fqdn, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_TXT);
1259 r->data.txt.string_list = strlst;
1260 avahi_server_add(s, g, interface, protocol, flags, r);
1261 avahi_record_unref(r);
1264 void avahi_server_add_text_va(
1269 AvahiEntryFlags flags,
1275 avahi_server_add_text_strlst(s, g, interface, protocol, flags, name, avahi_string_list_new_va(va));
1278 void avahi_server_add_text(
1283 AvahiEntryFlags flags,
1292 avahi_server_add_text_va(s, g, interface, protocol, flags, name, va);
1296 static void escape_service_name(gchar *d, guint size, const gchar *s) {
1301 while (*s && size >= 2) {
1302 if (*s == '.' || *s == '\\') {
1318 void avahi_server_add_service_strlst(
1325 const gchar *domain,
1328 AvahiStringList *strlst) {
1330 gchar ptr_name[256], svc_name[256], ename[64], enum_ptr[256];
1337 escape_service_name(ename, sizeof(ename), name);
1340 while (domain[0] == '.')
1343 domain = s->domain_name;
1346 host = s->host_name_fqdn;
1348 snprintf(ptr_name, sizeof(ptr_name), "%s.%s", type, domain);
1349 snprintf(svc_name, sizeof(svc_name), "%s.%s.%s", ename, type, domain);
1351 avahi_server_add_ptr(s, g, interface, protocol, AVAHI_ENTRY_NULL, ptr_name, svc_name);
1353 r = avahi_record_new_full(svc_name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV);
1354 r->data.srv.priority = 0;
1355 r->data.srv.weight = 0;
1356 r->data.srv.port = port;
1357 r->data.srv.name = avahi_normalize_name(host);
1358 avahi_server_add(s, g, interface, protocol, AVAHI_ENTRY_UNIQUE, r);
1359 avahi_record_unref(r);
1361 avahi_server_add_text_strlst(s, g, interface, protocol, AVAHI_ENTRY_UNIQUE, svc_name, strlst);
1363 snprintf(enum_ptr, sizeof(enum_ptr), "_services._dns-sd._udp.%s", domain);
1364 avahi_server_add_ptr(s, g, interface, protocol, AVAHI_ENTRY_NULL, enum_ptr, ptr_name);
1367 void avahi_server_add_service_va(
1374 const gchar *domain,
1383 avahi_server_add_service_strlst(s, g, interface, protocol, type, name, domain, host, port, avahi_string_list_new_va(va));
1386 void avahi_server_add_service(
1393 const gchar *domain,
1405 avahi_server_add_service_va(s, g, interface, protocol, type, name, domain, host, port, va);
1409 static void post_query_callback(AvahiInterfaceMonitor *m, AvahiInterface *i, gpointer userdata) {
1410 AvahiKey *k = userdata;
1416 avahi_interface_post_query(i, k, FALSE);
1419 void avahi_server_post_query(AvahiServer *s, gint interface, guchar protocol, AvahiKey *key) {
1423 avahi_interface_monitor_walk(s->monitor, interface, protocol, post_query_callback, key);
1426 void avahi_entry_group_change_state(AvahiEntryGroup *g, AvahiEntryGroupState state) {
1429 if (g->state == state)
1435 g->callback(g->server, g, state, g->userdata);
1440 AvahiEntryGroup *avahi_entry_group_new(AvahiServer *s, AvahiEntryGroupCallback callback, gpointer userdata) {
1445 g = g_new(AvahiEntryGroup, 1);
1447 g->callback = callback;
1448 g->userdata = userdata;
1450 g->state = AVAHI_ENTRY_GROUP_UNCOMMITED;
1452 AVAHI_LLIST_HEAD_INIT(AvahiEntry, g->entries);
1454 AVAHI_LLIST_PREPEND(AvahiEntryGroup, groups, s->groups, g);
1458 void avahi_entry_group_free(AvahiEntryGroup *g) {
1462 g_assert(g->server);
1464 for (e = g->entries; e; e = e->by_group_next) {
1465 avahi_goodbye_entry(g->server, e, TRUE);
1471 g->server->need_group_cleanup = TRUE;
1472 g->server->need_entry_cleanup = TRUE;
1475 void avahi_entry_group_commit(AvahiEntryGroup *g) {
1479 if (g->state != AVAHI_ENTRY_GROUP_UNCOMMITED)
1482 avahi_entry_group_change_state(g, AVAHI_ENTRY_GROUP_REGISTERING);
1483 avahi_announce_group(g->server, g);
1484 avahi_entry_group_check_probed(g, FALSE);
1487 gboolean avahi_entry_commited(AvahiEntry *e) {
1492 e->group->state == AVAHI_ENTRY_GROUP_REGISTERING ||
1493 e->group->state == AVAHI_ENTRY_GROUP_ESTABLISHED;
1496 AvahiEntryGroupState avahi_entry_group_get_state(AvahiEntryGroup *g) {
1503 void avahi_entry_group_set_data(AvahiEntryGroup *g, gpointer userdata) {
1506 g->userdata = userdata;
1509 gpointer avahi_entry_group_get_data(AvahiEntryGroup *g) {
1515 const gchar* avahi_server_get_domain_name(AvahiServer *s) {
1518 return s->domain_name;
1521 const gchar* avahi_server_get_host_name(AvahiServer *s) {
1524 return s->host_name;
1527 const gchar* avahi_server_get_host_name_fqdn(AvahiServer *s) {
1530 return s->host_name_fqdn;
1533 gpointer avahi_server_get_data(AvahiServer *s) {
1539 void avahi_server_set_data(AvahiServer *s, gpointer userdata) {
1542 s->userdata = userdata;
1545 AvahiServerState avahi_server_get_state(AvahiServer *s) {
1551 AvahiServerConfig* avahi_server_config_init(AvahiServerConfig *c) {
1554 memset(c, 0, sizeof(AvahiServerConfig));
1555 c->register_hinfo = TRUE;
1556 c->register_addresses = TRUE;
1559 c->host_name = NULL;
1560 c->domain_name = NULL;
1561 c->check_response_ttl = TRUE;
1562 c->announce_domain = TRUE;
1563 c->use_iff_running = FALSE;
1564 c->enable_reflector = FALSE;
1569 void avahi_server_config_free(AvahiServerConfig *c) {
1572 g_free(c->host_name);
1573 g_free(c->domain_name);
1576 AvahiServerConfig* avahi_server_config_copy(AvahiServerConfig *ret, const AvahiServerConfig *c) {
1582 ret->host_name = g_strdup(c->host_name);
1583 ret->domain_name = g_strdup(c->domain_name);