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;
107 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) {
116 g_assert(type != AVAHI_DNS_TYPE_ANY);
118 k = avahi_key_new(name, AVAHI_DNS_CLASS_IN, type);
120 for (e = g_hash_table_lookup(s->entries_by_key, k); e; e = e->by_key_next)
121 if (!e->dead && avahi_entry_registered(s, e, i))
122 callback(s, e->record, e->flags & AVAHI_ENTRY_UNIQUE, userdata);
127 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) {
133 if (r->key->class == AVAHI_DNS_CLASS_IN) {
134 if (r->key->type == AVAHI_DNS_TYPE_PTR) {
135 enum_aux_records(s, i, r->data.ptr.name, AVAHI_DNS_TYPE_SRV, callback, userdata);
136 enum_aux_records(s, i, r->data.ptr.name, AVAHI_DNS_TYPE_TXT, callback, userdata);
137 } else if (r->key->type == AVAHI_DNS_TYPE_SRV) {
138 enum_aux_records(s, i, r->data.srv.name, AVAHI_DNS_TYPE_A, callback, userdata);
139 enum_aux_records(s, i, r->data.srv.name, AVAHI_DNS_TYPE_AAAA, callback, userdata);
144 void avahi_server_prepare_response(AvahiServer *s, AvahiInterface *i, AvahiEntry *e, gboolean unicast_response, gboolean auxiliary) {
149 avahi_record_list_push(s->record_list, e->record, e->flags & AVAHI_ENTRY_UNIQUE, unicast_response, auxiliary);
152 void avahi_server_prepare_matching_responses(AvahiServer *s, AvahiInterface *i, AvahiKey *k, gboolean unicast_response) {
160 /* g_message("Posting responses matching [%s]", txt = avahi_key_to_string(k)); */
163 if (avahi_key_is_pattern(k)) {
165 /* Handle ANY query */
167 for (e = s->entries; e; e = e->entries_next)
168 if (!e->dead && avahi_key_pattern_match(k, e->record->key) && avahi_entry_registered(s, e, i))
169 avahi_server_prepare_response(s, i, e, unicast_response, FALSE);
173 /* Handle all other queries */
175 for (e = g_hash_table_lookup(s->entries_by_key, k); e; e = e->by_key_next)
176 if (!e->dead && avahi_entry_registered(s, e, i))
177 avahi_server_prepare_response(s, i, e, unicast_response, FALSE);
181 static void withdraw_entry(AvahiServer *s, AvahiEntry *e) {
188 for (k = e->group->entries; k; k = k->by_group_next) {
189 avahi_goodbye_entry(s, k, FALSE);
193 avahi_entry_group_change_state(e->group, AVAHI_ENTRY_GROUP_COLLISION);
195 avahi_goodbye_entry(s, e, FALSE);
199 s->need_entry_cleanup = TRUE;
202 static void withdraw_rrset(AvahiServer *s, AvahiKey *key) {
208 for (e = g_hash_table_lookup(s->entries_by_key, key); e; e = e->by_key_next)
209 withdraw_entry(s, e);
212 static void incoming_probe(AvahiServer *s, AvahiRecord *record, AvahiInterface *i) {
215 gboolean ours = FALSE, won = FALSE, lost = FALSE;
221 for (e = g_hash_table_lookup(s->entries_by_key, record->key); e; e = n) {
225 if (e->dead || !avahi_entry_probing(s, e, i))
228 if ((cmp = avahi_record_lexicographical_compare(e->record, record)) == 0) {
237 t = avahi_record_to_string(record);
242 g_message("Recieved conflicting probe [%s]. Local host won.", t);
244 g_message("Recieved conflicting probe [%s]. Local host lost. Withdrawing.", t);
245 withdraw_rrset(s, record->key);
252 static gboolean handle_conflict(AvahiServer *s, AvahiInterface *i, AvahiRecord *record, gboolean unique, const AvahiAddress *a) {
253 gboolean valid = TRUE, ours = FALSE, conflict = FALSE, withdraw_immediately = FALSE;
254 AvahiEntry *e, *n, *conflicting_entry = NULL;
261 t = avahi_record_to_string(record);
263 /* g_message("CHECKING FOR CONFLICT: [%s]", t); */
265 for (e = g_hash_table_lookup(s->entries_by_key, record->key); e; e = n) {
268 if (e->dead || (!(e->flags & AVAHI_ENTRY_UNIQUE) && !unique))
271 /* Either our entry or the other is intended to be unique, so let's check */
273 if (avahi_entry_registered(s, e, i)) {
275 if (avahi_record_equal_no_ttl(e->record, record)) {
276 ours = TRUE; /* We have an identical record, so this is no conflict */
278 /* Check wheter there is a TTL conflict */
279 if (record->ttl <= e->record->ttl/2) {
281 g_message("Recieved record with bad TTL [%s]. Refreshing.", t);
282 avahi_interface_post_response(i, e->record, FALSE, NULL, TRUE);
286 /* There's no need to check the other entries of this RRset */
289 /* A conflict => we have to return to probe mode */
291 conflicting_entry = e;
294 } else if (avahi_entry_probing(s, e, i)) {
296 if (!avahi_record_equal_no_ttl(record, e->record)) {
298 /* We are currently registering a matching record, but
299 * someone else already claimed it, so let's
302 withdraw_immediately = TRUE;
307 /* g_message("ours=%i conflict=%i", ours, conflict); */
309 if (!ours && conflict) {
312 if (withdraw_immediately) {
313 g_message("Recieved conflicting record [%s] with local record to be. Withdrawing.", t);
314 withdraw_rrset(s, record->key);
316 g_assert(conflicting_entry);
317 g_message("Recieved conflicting record [%s]. Resetting our record.", t);
318 avahi_entry_return_to_initial_state(s, conflicting_entry, i);
320 /* Local unique records are returned to probin
321 * state. Local shared records are reannounced. */
330 static void append_aux_callback(AvahiServer *s, AvahiRecord *r, gboolean flush_cache, gpointer userdata) {
331 gboolean *unicast_response = userdata;
335 g_assert(unicast_response);
337 avahi_record_list_push(s->record_list, r, flush_cache, *unicast_response, TRUE);
340 static void append_aux_records_to_list(AvahiServer *s, AvahiInterface *i, AvahiRecord *r, gboolean unicast_response) {
344 avahi_server_enumerate_aux_records(s, i, r, append_aux_callback, &unicast_response);
347 void avahi_server_generate_response(AvahiServer *s, AvahiInterface *i, AvahiDnsPacket *p, const AvahiAddress *a, guint16 port, gboolean legacy_unicast) {
351 g_assert(!legacy_unicast || (a && port > 0 && p));
353 if (legacy_unicast) {
354 AvahiDnsPacket *reply;
357 reply = avahi_dns_packet_new_reply(p, 512 /* unicast DNS maximum packet size is 512 */ , TRUE, TRUE);
359 while ((r = avahi_record_list_next(s->record_list, NULL, NULL, NULL))) {
361 append_aux_records_to_list(s, i, r, FALSE);
363 if (avahi_dns_packet_append_record(reply, r, FALSE, 10))
364 avahi_dns_packet_inc_field(reply, AVAHI_DNS_FIELD_ANCOUNT);
366 gchar *t = avahi_record_to_string(r);
367 g_warning("Record [%s] not fitting in legacy unicast packet, dropping.", t);
371 avahi_record_unref(r);
374 if (avahi_dns_packet_get_field(reply, AVAHI_DNS_FIELD_ANCOUNT) != 0)
375 avahi_interface_send_packet_unicast(i, reply, a, port);
377 avahi_dns_packet_free(reply);
380 gboolean unicast_response, flush_cache, auxiliary;
381 AvahiDnsPacket *reply = NULL;
384 /* In case the query packet was truncated never respond
385 immediately, because known answer suppression records might be
386 contained in later packets */
387 gboolean tc = p && !!(avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_FLAGS) & AVAHI_DNS_FLAG_TC);
389 while ((r = avahi_record_list_next(s->record_list, &flush_cache, &unicast_response, &auxiliary))) {
391 if (!avahi_interface_post_response(i, r, flush_cache, a, !tc && flush_cache && !auxiliary) && unicast_response) {
393 append_aux_records_to_list(s, i, r, unicast_response);
395 /* Due to some reasons the record has not been scheduled.
396 * The client requested an unicast response in that
397 * case. Therefore we prepare such a response */
403 reply = avahi_dns_packet_new_reply(p, i->hardware->mtu, FALSE, FALSE);
406 if (avahi_dns_packet_append_record(reply, r, flush_cache, 0)) {
408 /* Appending this record succeeded, so incremeant
409 * the specific header field, and return to the caller */
411 avahi_dns_packet_inc_field(reply, AVAHI_DNS_FIELD_ANCOUNT);
416 if (avahi_dns_packet_get_field(reply, AVAHI_DNS_FIELD_ANCOUNT) == 0) {
419 /* The record is too large for one packet, so create a larger packet */
421 avahi_dns_packet_free(reply);
422 size = avahi_record_get_estimate_size(r) + AVAHI_DNS_PACKET_HEADER_SIZE;
423 if (size > AVAHI_DNS_PACKET_MAX_SIZE)
424 size = AVAHI_DNS_PACKET_MAX_SIZE;
425 reply = avahi_dns_packet_new_reply(p, size, FALSE, TRUE);
427 if (!avahi_dns_packet_append_record(reply, r, flush_cache, 0)) {
428 avahi_dns_packet_free(reply);
430 gchar *t = avahi_record_to_string(r);
431 g_warning("Record [%s] too large, doesn't fit in any packet!", t);
435 avahi_dns_packet_inc_field(reply, AVAHI_DNS_FIELD_ANCOUNT);
438 /* Appending the record didn't succeeed, so let's send this packet, and create a new one */
439 avahi_interface_send_packet_unicast(i, reply, a, port);
440 avahi_dns_packet_free(reply);
445 avahi_record_unref(r);
449 if (avahi_dns_packet_get_field(reply, AVAHI_DNS_FIELD_ANCOUNT) != 0)
450 avahi_interface_send_packet_unicast(i, reply, a, port);
451 avahi_dns_packet_free(reply);
455 avahi_record_list_flush(s->record_list);
458 static void handle_query(AvahiServer *s, AvahiDnsPacket *p, AvahiInterface *i, const AvahiAddress *a, guint16 port, gboolean legacy_unicast) {
466 /* g_message("query"); */
468 g_assert(avahi_record_list_empty(s->record_list));
470 /* Handle the questions */
471 for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_QDCOUNT); n > 0; n --) {
473 gboolean unicast_response = FALSE;
475 if (!(key = avahi_dns_packet_consume_key(p, &unicast_response))) {
476 g_warning("Packet too short (1)");
480 avahi_query_scheduler_incoming(i->query_scheduler, key);
481 avahi_server_prepare_matching_responses(s, i, key, unicast_response);
482 avahi_key_unref(key);
485 /* Known Answer Suppression */
486 for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT); n > 0; n --) {
488 gboolean unique = FALSE;
490 if (!(record = avahi_dns_packet_consume_record(p, &unique))) {
491 g_warning("Packet too short (2)");
495 if (handle_conflict(s, i, record, unique, a)) {
496 avahi_response_scheduler_suppress(i->response_scheduler, record, a);
497 avahi_record_list_drop(s->record_list, record);
500 avahi_record_unref(record);
504 for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT); n > 0; n --) {
506 gboolean unique = FALSE;
508 if (!(record = avahi_dns_packet_consume_record(p, &unique))) {
509 g_warning("Packet too short (3)");
513 if (record->key->type != AVAHI_DNS_TYPE_ANY)
514 incoming_probe(s, record, i);
516 avahi_record_unref(record);
519 if (!avahi_record_list_empty(s->record_list))
520 avahi_server_generate_response(s, i, p, a, port, legacy_unicast);
525 avahi_record_list_flush(s->record_list);
529 static void handle_response(AvahiServer *s, AvahiDnsPacket *p, AvahiInterface *i, const AvahiAddress *a) {
537 /* g_message("response"); */
539 for (n = avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) +
540 avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ARCOUNT); n > 0; n--) {
542 gboolean cache_flush = FALSE;
545 if (!(record = avahi_dns_packet_consume_record(p, &cache_flush))) {
546 g_warning("Packet too short (4)");
550 if (record->key->type != AVAHI_DNS_TYPE_ANY) {
552 /* g_message("Handling response: %s", txt = avahi_record_to_string(record)); */
555 if (handle_conflict(s, i, record, cache_flush, a)) {
556 avahi_cache_update(i->cache, record, cache_flush, a);
557 avahi_response_scheduler_incoming(i->response_scheduler, record, cache_flush);
561 avahi_record_unref(record);
565 static void dispatch_packet(AvahiServer *s, AvahiDnsPacket *p, struct sockaddr *sa, gint iface, gint ttl) {
575 if (!(i = avahi_interface_monitor_get_interface(s->monitor, iface, sa->sa_family)) ||
576 !avahi_interface_relevant(i)) {
577 g_warning("Recieved packet from invalid interface.");
581 /* g_message("new packet recieved on interface '%s.%i'.", i->hardware->name, i->protocol); */
583 if (sa->sa_family == AF_INET6) {
584 static const guint8 ipv4_in_ipv6[] = {
585 0x00, 0x00, 0x00, 0x00,
586 0x00, 0x00, 0x00, 0x00,
587 0xFF, 0xFF, 0xFF, 0xFF };
589 /* This is an IPv4 address encapsulated in IPv6, so let's ignore it. */
591 if (memcmp(((struct sockaddr_in6*) sa)->sin6_addr.s6_addr, ipv4_in_ipv6, sizeof(ipv4_in_ipv6)) == 0)
595 if (avahi_dns_packet_check_valid(p) < 0) {
596 g_warning("Recieved invalid packet.");
600 port = avahi_port_from_sockaddr(sa);
601 avahi_address_from_sockaddr(sa, &a);
603 if (avahi_dns_packet_is_query(p)) {
604 gboolean legacy_unicast = FALSE;
606 if (avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ARCOUNT) != 0) {
607 g_warning("Invalid query packet.");
611 if (port != AVAHI_MDNS_PORT) {
614 if ((avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) != 0 ||
615 avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT) != 0)) {
616 g_warning("Invalid legacy unicast query packet.");
620 legacy_unicast = TRUE;
623 handle_query(s, p, i, &a, port, legacy_unicast);
625 /* g_message("Handled query"); */
628 if (port != AVAHI_MDNS_PORT) {
629 g_warning("Recieved repsonse with invalid source port %u on interface '%s.%i'", port, i->hardware->name, i->protocol);
634 g_warning("Recieved response with invalid TTL %u on interface '%s.%i'.", ttl, i->hardware->name, i->protocol);
635 if (s->config.check_response_ttl)
639 if (avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_QDCOUNT) != 0 ||
640 avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_ANCOUNT) == 0 ||
641 avahi_dns_packet_get_field(p, AVAHI_DNS_FIELD_NSCOUNT) != 0) {
642 g_warning("Invalid response packet.");
646 handle_response(s, p, i, &a);
647 /* g_message("Handled response"); */
651 static void work(AvahiServer *s) {
652 struct sockaddr_in6 sa6;
653 struct sockaddr_in sa;
660 if (s->pollfd_ipv4.revents & G_IO_IN) {
661 if ((p = avahi_recv_dns_packet_ipv4(s->fd_ipv4, &sa, &iface, &ttl))) {
662 dispatch_packet(s, p, (struct sockaddr*) &sa, iface, ttl);
663 avahi_dns_packet_free(p);
667 if (s->pollfd_ipv6.revents & G_IO_IN) {
668 if ((p = avahi_recv_dns_packet_ipv6(s->fd_ipv6, &sa6, &iface, &ttl))) {
669 dispatch_packet(s, p, (struct sockaddr*) &sa6, iface, ttl);
670 avahi_dns_packet_free(p);
675 static gboolean prepare_func(GSource *source, gint *timeout) {
683 static gboolean check_func(GSource *source) {
687 s = *((AvahiServer**) (((guint8*) source) + sizeof(GSource)));
690 return (s->pollfd_ipv4.revents | s->pollfd_ipv6.revents) & (G_IO_IN | G_IO_HUP | G_IO_ERR);
693 static gboolean dispatch_func(GSource *source, GSourceFunc callback, gpointer user_data) {
697 s = *((AvahiServer**) (((guint8*) source) + sizeof(GSource)));
706 static void server_set_state(AvahiServer *s, AvahiServerState state) {
709 if (s->state == state)
715 s->callback(s, state, s->userdata);
718 static void withdraw_host_rrs(AvahiServer *s) {
721 if (s->hinfo_entry_group) {
722 avahi_entry_group_free(s->hinfo_entry_group);
723 s->hinfo_entry_group = NULL;
726 if (s->browse_domain_entry_group) {
727 avahi_entry_group_free(s->browse_domain_entry_group);
728 s->browse_domain_entry_group = NULL;
731 avahi_update_host_rrs(s->monitor, TRUE);
732 s->n_host_rr_pending = 0;
735 void avahi_server_decrease_host_rr_pending(AvahiServer *s) {
738 g_assert(s->n_host_rr_pending > 0);
740 if (--s->n_host_rr_pending == 0)
741 server_set_state(s, AVAHI_SERVER_RUNNING);
744 void avahi_server_increase_host_rr_pending(AvahiServer *s) {
747 s->n_host_rr_pending ++;
750 void avahi_host_rr_entry_group_callback(AvahiServer *s, AvahiEntryGroup *g, AvahiEntryGroupState state, void *userdata) {
754 if (state == AVAHI_ENTRY_GROUP_REGISTERING &&
755 s->state == AVAHI_SERVER_REGISTERING)
756 avahi_server_increase_host_rr_pending(s);
757 else if (state == AVAHI_ENTRY_GROUP_COLLISION &&
758 (s->state == AVAHI_SERVER_REGISTERING || s->state == AVAHI_SERVER_RUNNING)) {
759 withdraw_host_rrs(s);
760 server_set_state(s, AVAHI_SERVER_COLLISION);
761 } else if (state == AVAHI_ENTRY_GROUP_ESTABLISHED &&
762 s->state == AVAHI_SERVER_REGISTERING)
763 avahi_server_decrease_host_rr_pending(s);
766 static void register_hinfo(AvahiServer *s) {
767 struct utsname utsname;
772 if (!s->config.register_hinfo || s->hinfo_entry_group)
775 s->hinfo_entry_group = avahi_entry_group_new(s, avahi_host_rr_entry_group_callback, NULL);
777 /* Fill in HINFO rr */
778 r = avahi_record_new_full(s->host_name_fqdn, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_HINFO);
780 r->data.hinfo.cpu = g_strdup(g_strup(utsname.machine));
781 r->data.hinfo.os = g_strdup(g_strup(utsname.sysname));
782 avahi_server_add(s, s->hinfo_entry_group, 0, AF_UNSPEC, AVAHI_ENTRY_UNIQUE, r);
783 avahi_record_unref(r);
785 avahi_entry_group_commit(s->hinfo_entry_group);
788 static void register_localhost(AvahiServer *s) {
792 /* Add localhost entries */
793 avahi_address_parse("127.0.0.1", AF_INET, &a);
794 avahi_server_add_address(s, NULL, 0, AF_UNSPEC, AVAHI_ENTRY_NOPROBE|AVAHI_ENTRY_NOANNOUNCE, "localhost", &a);
796 avahi_address_parse("::1", AF_INET6, &a);
797 avahi_server_add_address(s, NULL, 0, AF_UNSPEC, AVAHI_ENTRY_NOPROBE|AVAHI_ENTRY_NOANNOUNCE, "ip6-localhost", &a);
800 static void register_browse_domain(AvahiServer *s) {
803 if (!s->config.announce_domain || s->browse_domain_entry_group)
806 s->browse_domain_entry_group = avahi_entry_group_new(s, NULL, NULL);
807 avahi_server_add_ptr(s, s->browse_domain_entry_group, 0, AF_UNSPEC, 0, "_browse._dns-sd._udp.local", s->domain_name);
808 avahi_entry_group_commit(s->browse_domain_entry_group);
811 static void register_stuff(AvahiServer *s) {
814 server_set_state(s, AVAHI_SERVER_REGISTERING);
816 register_browse_domain(s);
817 avahi_update_host_rrs(s->monitor, FALSE);
819 if (s->n_host_rr_pending == 0)
820 server_set_state(s, AVAHI_SERVER_RUNNING);
823 static void update_fqdn(AvahiServer *s) {
826 g_assert(s->host_name);
827 g_assert(s->domain_name);
829 g_free(s->host_name_fqdn);
830 s->host_name_fqdn = g_strdup_printf("%s.%s", s->host_name, s->domain_name);
833 static void register_time_event_callback(AvahiTimeEvent *e, gpointer userdata) {
834 AvahiServer *s = userdata;
839 g_assert(e == s->register_time_event);
840 avahi_time_event_queue_remove(s->time_event_queue, s->register_time_event);
841 s->register_time_event = NULL;
843 if (s->state == AVAHI_SERVER_SLEEPING)
847 static void delayed_register_stuff(AvahiServer *s) {
852 avahi_elapse_time(&tv, AVAHI_HOST_RR_HOLDOFF_MSEC, 0);
854 if (s->register_time_event)
855 avahi_time_event_queue_update(s->time_event_queue, s->register_time_event, &tv);
857 s->register_time_event = avahi_time_event_queue_add(s->time_event_queue, &tv, register_time_event_callback, s);
860 void avahi_server_set_host_name(AvahiServer *s, const gchar *host_name) {
864 server_set_state(s, AVAHI_SERVER_SLEEPING);
865 withdraw_host_rrs(s);
867 g_free(s->host_name);
868 s->host_name = host_name ? avahi_normalize_name(host_name) : avahi_get_host_name();
869 s->host_name[strcspn(s->host_name, ".")] = 0;
872 delayed_register_stuff(s);
875 void avahi_server_set_domain_name(AvahiServer *s, const gchar *domain_name) {
877 g_assert(domain_name);
879 server_set_state(s, AVAHI_SERVER_SLEEPING);
880 withdraw_host_rrs(s);
882 g_free(s->domain_name);
883 s->domain_name = domain_name ? avahi_normalize_name(domain_name) : g_strdup("local.");
886 delayed_register_stuff(s);
889 AvahiServer *avahi_server_new(GMainContext *c, const AvahiServerConfig *sc, AvahiServerCallback callback, gpointer userdata) {
892 static GSourceFuncs source_funcs = {
901 s = g_new(AvahiServer, 1);
902 s->n_host_rr_pending = 0;
903 s->need_entry_cleanup = s->need_group_cleanup = FALSE;
906 avahi_server_config_copy(&s->config, sc);
908 avahi_server_config_init(&s->config);
910 s->fd_ipv4 = s->config.use_ipv4 ? avahi_open_socket_ipv4() : -1;
911 s->fd_ipv6 = s->config.use_ipv6 ? avahi_open_socket_ipv6() : -1;
913 if (s->fd_ipv6 < 0 && s->fd_ipv4 < 0) {
914 g_critical("Selected neither IPv6 nor IPv4 support, aborting.\n");
915 avahi_server_config_free(&s->config);
920 if (s->fd_ipv4 < 0 && s->config.use_ipv4)
921 g_message("Failed to create IPv4 socket, proceeding in IPv6 only mode");
922 else if (s->fd_ipv6 < 0 && s->config.use_ipv6)
923 g_message("Failed to create IPv6 socket, proceeding in IPv4 only mode");
926 g_main_context_ref(s->context = c);
928 s->context = g_main_context_default();
930 /* Prepare IO source registration */
931 s->source = g_source_new(&source_funcs, sizeof(GSource) + sizeof(AvahiServer*));
932 *((AvahiServer**) (((guint8*) s->source) + sizeof(GSource))) = s;
934 memset(&s->pollfd_ipv4, 0, sizeof(s->pollfd_ipv4));
935 s->pollfd_ipv4.fd = s->fd_ipv4;
936 s->pollfd_ipv4.events = G_IO_IN|G_IO_ERR|G_IO_HUP;
937 g_source_add_poll(s->source, &s->pollfd_ipv4);
939 memset(&s->pollfd_ipv6, 0, sizeof(s->pollfd_ipv6));
940 s->pollfd_ipv6.fd = s->fd_ipv6;
941 s->pollfd_ipv6.events = G_IO_IN|G_IO_ERR|G_IO_HUP;
942 g_source_add_poll(s->source, &s->pollfd_ipv6);
944 g_source_attach(s->source, s->context);
946 s->callback = callback;
947 s->userdata = userdata;
949 AVAHI_LLIST_HEAD_INIT(AvahiEntry, s->entries);
950 s->entries_by_key = g_hash_table_new((GHashFunc) avahi_key_hash, (GEqualFunc) avahi_key_equal);
951 AVAHI_LLIST_HEAD_INIT(AvahiGroup, s->groups);
953 AVAHI_LLIST_HEAD_INIT(AvahiRecordResolver, s->record_resolvers);
954 s->record_resolver_hashtable = g_hash_table_new((GHashFunc) avahi_key_hash, (GEqualFunc) avahi_key_equal);
955 AVAHI_LLIST_HEAD_INIT(AvahiHostNameResolver, s->host_name_resolvers);
958 s->host_name = s->config.host_name ? avahi_normalize_name(s->config.host_name) : avahi_get_host_name();
959 s->host_name[strcspn(s->host_name, ".")] = 0;
960 s->domain_name = s->config.domain_name ? avahi_normalize_name(s->config.domain_name) : g_strdup("local.");
961 s->host_name_fqdn = NULL;
964 s->record_list = avahi_record_list_new();
966 s->time_event_queue = avahi_time_event_queue_new(s->context, G_PRIORITY_DEFAULT+10); /* Slightly less priority than the FDs */
967 s->register_time_event = NULL;
969 s->state = AVAHI_SERVER_INVALID;
971 s->monitor = avahi_interface_monitor_new(s);
972 avahi_interface_monitor_sync(s->monitor);
974 register_localhost(s);
976 s->hinfo_entry_group = NULL;
977 s->browse_domain_entry_group = NULL;
983 void avahi_server_free(AvahiServer* s) {
987 free_entry(s, s->entries);
989 avahi_interface_monitor_free(s->monitor);
992 free_group(s, s->groups);
994 while (s->host_name_resolvers)
995 avahi_host_name_resolver_free(s->host_name_resolvers);
997 while (s->record_resolvers)
998 avahi_record_resolver_free(s->record_resolvers);
999 g_hash_table_destroy(s->record_resolver_hashtable);
1001 g_hash_table_destroy(s->entries_by_key);
1003 if (s->register_time_event)
1004 avahi_time_event_queue_remove(s->time_event_queue, s->register_time_event);
1005 avahi_time_event_queue_free(s->time_event_queue);
1007 avahi_record_list_free(s->record_list);
1009 if (s->fd_ipv4 >= 0)
1011 if (s->fd_ipv6 >= 0)
1014 g_free(s->host_name);
1015 g_free(s->domain_name);
1016 g_free(s->host_name_fqdn);
1018 g_source_destroy(s->source);
1019 g_source_unref(s->source);
1020 g_main_context_unref(s->context);
1022 avahi_server_config_free(&s->config);
1027 void avahi_server_add(
1032 AvahiEntryFlags flags,
1039 g_assert(r->key->type != AVAHI_DNS_TYPE_ANY);
1041 e = g_new(AvahiEntry, 1);
1043 e->record = avahi_record_ref(r);
1045 e->interface = interface;
1046 e->protocol = protocol;
1050 AVAHI_LLIST_HEAD_INIT(AvahiAnnouncement, e->announcements);
1052 AVAHI_LLIST_PREPEND(AvahiEntry, entries, s->entries, e);
1054 /* Insert into hash table indexed by name */
1055 t = g_hash_table_lookup(s->entries_by_key, e->record->key);
1056 AVAHI_LLIST_PREPEND(AvahiEntry, by_key, t, e);
1057 g_hash_table_replace(s->entries_by_key, e->record->key, t);
1059 /* Insert into group list */
1061 AVAHI_LLIST_PREPEND(AvahiEntry, by_group, g->entries, e);
1063 avahi_announce_entry(s, e);
1065 const AvahiRecord *avahi_server_iterate(AvahiServer *s, AvahiEntryGroup *g, void **state) {
1066 AvahiEntry **e = (AvahiEntry**) state;
1071 *e = g ? g->entries : s->entries;
1073 while (*e && (*e)->dead)
1074 *e = g ? (*e)->by_group_next : (*e)->entries_next;
1079 return avahi_record_ref((*e)->record);
1082 void avahi_server_dump(AvahiServer *s, FILE *f) {
1087 fprintf(f, "\n;;; ZONE DUMP FOLLOWS ;;;\n");
1089 for (e = s->entries; e; e = e->entries_next) {
1095 t = avahi_record_to_string(e->record);
1096 fprintf(f, "%s ; iface=%i proto=%i\n", t, e->interface, e->protocol);
1100 avahi_dump_caches(s->monitor, f);
1103 void avahi_server_add_ptr(
1108 AvahiEntryFlags flags,
1110 const gchar *dest) {
1116 r = avahi_record_new_full(name ? name : s->host_name_fqdn, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_PTR);
1117 r->data.ptr.name = avahi_normalize_name(dest);
1118 avahi_server_add(s, g, interface, protocol, flags, r);
1119 avahi_record_unref(r);
1122 void avahi_server_add_address(
1127 AvahiEntryFlags flags,
1135 name = name ? (n = avahi_normalize_name(name)) : s->host_name_fqdn;
1137 if (a->family == AF_INET) {
1141 r = avahi_record_new_full(name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_A);
1142 r->data.a.address = a->data.ipv4;
1143 avahi_server_add(s, g, interface, protocol, flags | AVAHI_ENTRY_UNIQUE, r);
1144 avahi_record_unref(r);
1146 reverse = avahi_reverse_lookup_name_ipv4(&a->data.ipv4);
1147 avahi_server_add_ptr(s, g, interface, protocol, flags | AVAHI_ENTRY_UNIQUE, reverse, name);
1154 r = avahi_record_new_full(name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_AAAA);
1155 r->data.aaaa.address = a->data.ipv6;
1156 avahi_server_add(s, g, interface, protocol, flags | AVAHI_ENTRY_UNIQUE, r);
1157 avahi_record_unref(r);
1159 reverse = avahi_reverse_lookup_name_ipv6_arpa(&a->data.ipv6);
1160 avahi_server_add_ptr(s, g, interface, protocol, flags | AVAHI_ENTRY_UNIQUE, reverse, name);
1163 reverse = avahi_reverse_lookup_name_ipv6_int(&a->data.ipv6);
1164 avahi_server_add_ptr(s, g, interface, protocol, flags | AVAHI_ENTRY_UNIQUE, reverse, name);
1171 void avahi_server_add_text_strlst(
1176 AvahiEntryFlags flags,
1178 AvahiStringList *strlst) {
1184 r = avahi_record_new_full(name ? name : s->host_name_fqdn, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_TXT);
1185 r->data.txt.string_list = strlst;
1186 avahi_server_add(s, g, interface, protocol, flags, r);
1187 avahi_record_unref(r);
1190 void avahi_server_add_text_va(
1195 AvahiEntryFlags flags,
1201 avahi_server_add_text_strlst(s, g, interface, protocol, flags, name, avahi_string_list_new_va(va));
1204 void avahi_server_add_text(
1209 AvahiEntryFlags flags,
1218 avahi_server_add_text_va(s, g, interface, protocol, flags, name, va);
1222 static void escape_service_name(gchar *d, guint size, const gchar *s) {
1227 while (*s && size >= 2) {
1228 if (*s == '.' || *s == '\\') {
1244 void avahi_server_add_service_strlst(
1251 const gchar *domain,
1254 AvahiStringList *strlst) {
1256 gchar ptr_name[256], svc_name[256], ename[64], enum_ptr[256];
1263 escape_service_name(ename, sizeof(ename), name);
1266 while (domain[0] == '.')
1269 domain = s->domain_name;
1272 host = s->host_name_fqdn;
1274 snprintf(ptr_name, sizeof(ptr_name), "%s.%s", type, domain);
1275 snprintf(svc_name, sizeof(svc_name), "%s.%s.%s", ename, type, domain);
1277 avahi_server_add_ptr(s, g, interface, protocol, AVAHI_ENTRY_NULL, ptr_name, svc_name);
1279 r = avahi_record_new_full(svc_name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV);
1280 r->data.srv.priority = 0;
1281 r->data.srv.weight = 0;
1282 r->data.srv.port = port;
1283 r->data.srv.name = avahi_normalize_name(host);
1284 avahi_server_add(s, g, interface, protocol, AVAHI_ENTRY_UNIQUE, r);
1285 avahi_record_unref(r);
1287 avahi_server_add_text_strlst(s, g, interface, protocol, AVAHI_ENTRY_UNIQUE, svc_name, strlst);
1289 snprintf(enum_ptr, sizeof(enum_ptr), "_services._dns-sd._udp.%s", domain);
1290 avahi_server_add_ptr(s, g, interface, protocol, AVAHI_ENTRY_NULL, enum_ptr, ptr_name);
1293 void avahi_server_add_service_va(
1300 const gchar *domain,
1309 avahi_server_add_service_strlst(s, g, interface, protocol, type, name, domain, host, port, avahi_string_list_new_va(va));
1312 void avahi_server_add_service(
1319 const gchar *domain,
1331 avahi_server_add_service_va(s, g, interface, protocol, type, name, domain, host, port, va);
1335 static void post_query_callback(AvahiInterfaceMonitor *m, AvahiInterface *i, gpointer userdata) {
1336 AvahiKey *k = userdata;
1342 avahi_interface_post_query(i, k, FALSE);
1345 void avahi_server_post_query(AvahiServer *s, gint interface, guchar protocol, AvahiKey *key) {
1349 avahi_interface_monitor_walk(s->monitor, interface, protocol, post_query_callback, key);
1352 void avahi_entry_group_change_state(AvahiEntryGroup *g, AvahiEntryGroupState state) {
1355 if (g->state == state)
1361 g->callback(g->server, g, state, g->userdata);
1366 AvahiEntryGroup *avahi_entry_group_new(AvahiServer *s, AvahiEntryGroupCallback callback, gpointer userdata) {
1371 g = g_new(AvahiEntryGroup, 1);
1373 g->callback = callback;
1374 g->userdata = userdata;
1376 g->state = AVAHI_ENTRY_GROUP_UNCOMMITED;
1378 AVAHI_LLIST_HEAD_INIT(AvahiEntry, g->entries);
1380 AVAHI_LLIST_PREPEND(AvahiEntryGroup, groups, s->groups, g);
1384 void avahi_entry_group_free(AvahiEntryGroup *g) {
1388 g_assert(g->server);
1390 for (e = g->entries; e; e = e->by_group_next) {
1391 avahi_goodbye_entry(g->server, e, TRUE);
1397 g->server->need_group_cleanup = TRUE;
1398 g->server->need_entry_cleanup = TRUE;
1401 void avahi_entry_group_commit(AvahiEntryGroup *g) {
1405 if (g->state != AVAHI_ENTRY_GROUP_UNCOMMITED)
1408 avahi_entry_group_change_state(g, AVAHI_ENTRY_GROUP_REGISTERING);
1409 avahi_announce_group(g->server, g);
1410 avahi_entry_group_check_probed(g, FALSE);
1413 gboolean avahi_entry_commited(AvahiEntry *e) {
1418 e->group->state == AVAHI_ENTRY_GROUP_REGISTERING ||
1419 e->group->state == AVAHI_ENTRY_GROUP_ESTABLISHED;
1422 AvahiEntryGroupState avahi_entry_group_get_state(AvahiEntryGroup *g) {
1429 void avahi_entry_group_set_data(AvahiEntryGroup *g, gpointer userdata) {
1432 g->userdata = userdata;
1435 gpointer avahi_entry_group_get_data(AvahiEntryGroup *g) {
1441 const gchar* avahi_server_get_domain_name(AvahiServer *s) {
1444 return s->domain_name;
1447 const gchar* avahi_server_get_host_name(AvahiServer *s) {
1450 return s->host_name;
1453 const gchar* avahi_server_get_host_name_fqdn(AvahiServer *s) {
1456 return s->host_name_fqdn;
1459 gpointer avahi_server_get_data(AvahiServer *s) {
1465 void avahi_server_set_data(AvahiServer *s, gpointer userdata) {
1468 s->userdata = userdata;
1471 AvahiServerState avhai_server_get_state(AvahiServer *s) {
1477 AvahiServerConfig* avahi_server_config_init(AvahiServerConfig *c) {
1480 memset(c, 0, sizeof(AvahiServerConfig));
1481 c->register_hinfo = TRUE;
1482 c->register_addresses = TRUE;
1485 c->host_name = NULL;
1486 c->domain_name = NULL;
1487 c->check_response_ttl = TRUE;
1488 c->announce_domain = TRUE;
1489 c->use_iff_running = FALSE;
1494 void avahi_server_config_free(AvahiServerConfig *c) {
1497 g_free(c->host_name);
1498 g_free(c->domain_name);
1501 AvahiServerConfig* avahi_server_config_copy(AvahiServerConfig *ret, const AvahiServerConfig *c) {
1507 ret->host_name = g_strdup(c->host_name);
1508 ret->domain_name = g_strdup(c->domain_name);