4 This file is part of avahi.
6 avahi is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as
8 published by the Free Software Foundation; either version 2.1 of the
9 License, or (at your option) any later version.
11 avahi is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
13 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
14 Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with avahi; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
30 #include <netinet/in.h>
31 #include <sys/types.h>
32 #include <sys/socket.h>
34 #include <avahi-common/error.h>
35 #include <avahi-common/malloc.h>
36 #include <avahi-common/domain.h>
44 #include "multicast-lookup.h"
47 void avahi_interface_address_update_rrs(AvahiInterfaceAddress *a, int remove_rrs) {
48 AvahiInterfaceMonitor *m;
53 if (a->interface->announcing &&
55 avahi_interface_address_is_relevant(a) &&
57 m->server->config.publish_addresses &&
58 (m->server->state == AVAHI_SERVER_RUNNING ||
59 m->server->state == AVAHI_SERVER_REGISTERING)) {
61 /* Fill the entry group */
63 a->entry_group = avahi_s_entry_group_new(m->server, avahi_host_rr_entry_group_callback, NULL);
65 if (!a->entry_group) /* OOM */
68 if (avahi_s_entry_group_is_empty(a->entry_group)) {
69 char t[AVAHI_ADDRESS_STR_MAX];
70 avahi_address_snprint(t, sizeof(t), &a->address);
72 avahi_log_info("Registering new address record for %s on %s.", t, a->interface->hardware->name);
74 if (avahi_server_add_address(m->server, a->entry_group, a->interface->hardware->index, a->interface->protocol, 0, NULL, &a->address) < 0) {
75 avahi_log_warn(__FILE__": avahi_server_add_address() failed: %s", avahi_strerror(m->server->error));
76 avahi_s_entry_group_free(a->entry_group);
77 a->entry_group = NULL;
81 avahi_s_entry_group_commit(a->entry_group);
85 /* Clear the entry group */
87 if (a->entry_group && !avahi_s_entry_group_is_empty(a->entry_group)) {
88 char t[AVAHI_ADDRESS_STR_MAX];
89 avahi_address_snprint(t, sizeof(t), &a->address);
91 if (avahi_s_entry_group_get_state(a->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING &&
92 m->server->state == AVAHI_SERVER_REGISTERING)
93 avahi_server_decrease_host_rr_pending(m->server);
95 avahi_log_info("Withdrawing address record for %s on %s.", t, a->interface->hardware->name);
97 avahi_s_entry_group_reset(a->entry_group);
102 void avahi_interface_update_rrs(AvahiInterface *i, int remove_rrs) {
103 AvahiInterfaceAddress *a;
107 for (a = i->addresses; a; a = a->address_next)
108 avahi_interface_address_update_rrs(a, remove_rrs);
111 void avahi_hw_interface_update_rrs(AvahiHwInterface *hw, int remove_rrs) {
113 AvahiInterfaceMonitor *m;
118 for (i = hw->interfaces; i; i = i->by_hardware_next)
119 avahi_interface_update_rrs(i, remove_rrs);
121 if (m->list_complete &&
123 m->server->config.publish_workstation &&
124 (m->server->state == AVAHI_SERVER_RUNNING ||
125 m->server->state == AVAHI_SERVER_REGISTERING)) {
127 if (!hw->entry_group)
128 hw->entry_group = avahi_s_entry_group_new(m->server, avahi_host_rr_entry_group_callback, NULL);
130 if (!hw->entry_group)
133 if (avahi_s_entry_group_is_empty(hw->entry_group)) {
134 char name[AVAHI_LABEL_MAX];
137 if (!(t = avahi_format_mac_address(hw->mac_address, hw->mac_address_size)))
140 snprintf(name, sizeof(name), "%s [%s]", m->server->host_name, t);
146 if (avahi_server_add_service(m->server, hw->entry_group, hw->index, AVAHI_PROTO_UNSPEC, 0, name, "_workstation._tcp", NULL, NULL, 9, NULL) < 0) {
147 avahi_log_warn(__FILE__": avahi_server_add_service() failed: %s", avahi_strerror(m->server->error));
148 avahi_s_entry_group_free(hw->entry_group);
149 hw->entry_group = NULL;
151 avahi_s_entry_group_commit(hw->entry_group);
156 if (hw->entry_group && !avahi_s_entry_group_is_empty(hw->entry_group)) {
158 if (avahi_s_entry_group_get_state(hw->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING)
159 avahi_server_decrease_host_rr_pending(m->server);
161 avahi_s_entry_group_reset(hw->entry_group);
166 void avahi_interface_monitor_update_rrs(AvahiInterfaceMonitor *m, int remove_rrs) {
167 AvahiHwInterface *hw;
171 for (hw = m->hw_interfaces; hw; hw = hw->hardware_next)
172 avahi_hw_interface_update_rrs(hw, remove_rrs);
175 static int interface_mdns_mcast_join(AvahiInterface *i, int join) {
176 char at[AVAHI_ADDRESS_STR_MAX];
179 assert((join && !i->mcast_joined) || (!join && i->mcast_joined));
182 AvahiInterfaceAddress *a;
184 /* Look if there's an address with global scope */
185 for (a = i->addresses; a; a = a->address_next)
189 /* No address with a global scope has been found, so let's use
194 /* Hmm, there is no address available. */
196 avahi_log_warn(__FILE__": interface_mdns_mcast_join() called but no local address available.");
200 i->local_mcast_address = a->address;
203 avahi_log_info("%s mDNS multicast group on interface %s.%s with address %s.",
204 join ? "Joining" : "Leaving",
206 avahi_proto_to_string(i->protocol),
207 avahi_address_snprint(at, sizeof(at), &i->local_mcast_address));
209 if (i->protocol == AVAHI_PROTO_INET6) {
210 if (avahi_mdns_mcast_join_ipv6(i->monitor->server->fd_ipv6, &i->local_mcast_address.data.ipv6, i->hardware->index, join) < 0)
214 assert(i->protocol == AVAHI_PROTO_INET);
216 if (avahi_mdns_mcast_join_ipv4(i->monitor->server->fd_ipv4, &i->local_mcast_address.data.ipv4, i->hardware->index, join) < 0)
220 i->mcast_joined = join;
224 static int interface_mdns_mcast_rejoin(AvahiInterface *i) {
225 AvahiInterfaceAddress *a, *usable = NULL, *found = NULL;
228 if (!i->mcast_joined)
231 /* Check whether old address we joined with is still available. If
232 * not, rejoin using an other address. */
234 for (a = i->addresses; a; a = a->address_next) {
235 if (a->global_scope && !usable)
238 if (avahi_address_cmp(&a->address, &i->local_mcast_address) == 0) {
241 /* No action necessary: the address still exists and
242 * has global scope. */
249 if (found && !usable)
250 /* No action necessary: the address still exists and no better one has been found */
253 interface_mdns_mcast_join(i, 0);
254 return interface_mdns_mcast_join(i, 1);
257 void avahi_interface_address_free(AvahiInterfaceAddress *a) {
259 assert(a->interface);
261 avahi_interface_address_update_rrs(a, 1);
262 AVAHI_LLIST_REMOVE(AvahiInterfaceAddress, address, a->interface->addresses, a);
265 avahi_s_entry_group_free(a->entry_group);
267 interface_mdns_mcast_rejoin(a->interface);
272 void avahi_interface_free(AvahiInterface *i, int send_goodbye) {
275 /* Handle goodbyes and remove announcers */
276 avahi_goodbye_interface(i->monitor->server, i, send_goodbye, 1);
277 avahi_response_scheduler_force(i->response_scheduler);
278 assert(!i->announcers);
281 interface_mdns_mcast_join(i, 0);
283 /* Remove queriers */
284 avahi_querier_free_all(i);
285 avahi_hashmap_free(i->queriers_by_key);
287 /* Remove local RRs */
288 avahi_interface_update_rrs(i, 1);
291 avahi_interface_address_free(i->addresses);
293 avahi_response_scheduler_free(i->response_scheduler);
294 avahi_query_scheduler_free(i->query_scheduler);
295 avahi_probe_scheduler_free(i->probe_scheduler);
296 avahi_cache_free(i->cache);
298 AVAHI_LLIST_REMOVE(AvahiInterface, interface, i->monitor->interfaces, i);
299 AVAHI_LLIST_REMOVE(AvahiInterface, by_hardware, i->hardware->interfaces, i);
304 void avahi_hw_interface_free(AvahiHwInterface *hw, int send_goodbye) {
307 avahi_hw_interface_update_rrs(hw, 1);
309 while (hw->interfaces)
310 avahi_interface_free(hw->interfaces, send_goodbye);
313 avahi_s_entry_group_free(hw->entry_group);
315 AVAHI_LLIST_REMOVE(AvahiHwInterface, hardware, hw->monitor->hw_interfaces, hw);
316 avahi_hashmap_remove(hw->monitor->hashmap, &hw->index);
318 avahi_free(hw->name);
322 AvahiInterface* avahi_interface_new(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, AvahiProtocol protocol) {
327 assert(AVAHI_PROTO_VALID(protocol));
329 if (!(i = avahi_new(AvahiInterface, 1)))
334 i->protocol = protocol;
338 AVAHI_LLIST_HEAD_INIT(AvahiInterfaceAddress, i->addresses);
339 AVAHI_LLIST_HEAD_INIT(AvahiAnnouncer, i->announcers);
341 AVAHI_LLIST_HEAD_INIT(AvahiQuerier, i->queriers);
342 i->queriers_by_key = avahi_hashmap_new((AvahiHashFunc) avahi_key_hash, (AvahiEqualFunc) avahi_key_equal, NULL, NULL);
344 i->cache = avahi_cache_new(m->server, i);
345 i->response_scheduler = avahi_response_scheduler_new(i);
346 i->query_scheduler = avahi_query_scheduler_new(i);
347 i->probe_scheduler = avahi_probe_scheduler_new(i);
349 if (!i->cache || !i->response_scheduler || !i->query_scheduler || !i->probe_scheduler)
352 AVAHI_LLIST_PREPEND(AvahiInterface, by_hardware, hw->interfaces, i);
353 AVAHI_LLIST_PREPEND(AvahiInterface, interface, m->interfaces, i);
361 avahi_cache_free(i->cache);
362 if (i->response_scheduler)
363 avahi_response_scheduler_free(i->response_scheduler);
364 if (i->query_scheduler)
365 avahi_query_scheduler_free(i->query_scheduler);
366 if (i->probe_scheduler)
367 avahi_probe_scheduler_free(i->probe_scheduler);
373 AvahiHwInterface *avahi_hw_interface_new(AvahiInterfaceMonitor *m, AvahiIfIndex idx) {
374 AvahiHwInterface *hw;
377 assert(AVAHI_IF_VALID(idx));
379 if (!(hw = avahi_new(AvahiHwInterface, 1)))
387 hw->mac_address_size = 0;
388 hw->entry_group = NULL;
390 AVAHI_LLIST_HEAD_INIT(AvahiInterface, hw->interfaces);
391 AVAHI_LLIST_PREPEND(AvahiHwInterface, hardware, m->hw_interfaces, hw);
393 avahi_hashmap_insert(m->hashmap, &hw->index, hw);
395 if (m->server->fd_ipv4 >= 0)
396 avahi_interface_new(m, hw, AVAHI_PROTO_INET);
397 if (m->server->fd_ipv6 >= 0)
398 avahi_interface_new(m, hw, AVAHI_PROTO_INET6);
403 AvahiInterfaceAddress *avahi_interface_address_new(AvahiInterfaceMonitor *m, AvahiInterface *i, const AvahiAddress *addr, unsigned prefix_len) {
404 AvahiInterfaceAddress *a;
409 if (!(a = avahi_new(AvahiInterfaceAddress, 1)))
415 a->prefix_len = prefix_len;
417 a->entry_group = NULL;
419 AVAHI_LLIST_PREPEND(AvahiInterfaceAddress, address, i->addresses, a);
424 void avahi_interface_check_relevant(AvahiInterface *i) {
426 AvahiInterfaceMonitor *m;
431 b = avahi_interface_is_relevant(i);
433 if (m->list_complete && b && !i->announcing) {
434 avahi_log_info("New relevant interface %s.%s for mDNS.", i->hardware->name, avahi_proto_to_string(i->protocol));
436 interface_mdns_mcast_join(i, 1);
439 avahi_announce_interface(m->server, i);
440 avahi_multicast_lookup_engine_new_interface(m->server->multicast_lookup_engine, i);
441 } else if (!b && i->announcing) {
442 avahi_log_info("Interface %s.%s no longer relevant for mDNS.", i->hardware->name, avahi_proto_to_string(i->protocol));
444 interface_mdns_mcast_join(i, 0);
446 avahi_goodbye_interface(m->server, i, 0, 1);
447 avahi_querier_free_all(i);
449 avahi_response_scheduler_clear(i->response_scheduler);
450 avahi_query_scheduler_clear(i->query_scheduler);
451 avahi_probe_scheduler_clear(i->probe_scheduler);
452 avahi_cache_flush(i->cache);
457 interface_mdns_mcast_rejoin(i);
460 void avahi_hw_interface_check_relevant(AvahiHwInterface *hw) {
465 for (i = hw->interfaces; i; i = i->by_hardware_next)
466 avahi_interface_check_relevant(i);
469 void avahi_interface_monitor_check_relevant(AvahiInterfaceMonitor *m) {
474 for (i = m->interfaces; i; i = i->interface_next)
475 avahi_interface_check_relevant(i);
478 AvahiInterfaceMonitor *avahi_interface_monitor_new(AvahiServer *s) {
479 AvahiInterfaceMonitor *m = NULL;
481 if (!(m = avahi_new0(AvahiInterfaceMonitor, 1)))
482 return NULL; /* OOM */
485 m->list_complete = 0;
486 m->hashmap = avahi_hashmap_new(avahi_int_hash, avahi_int_equal, NULL, NULL);
488 AVAHI_LLIST_HEAD_INIT(AvahiInterface, m->interfaces);
489 AVAHI_LLIST_HEAD_INIT(AvahiHwInterface, m->hw_interfaces);
491 if (avahi_interface_monitor_init_osdep(m) < 0)
497 avahi_interface_monitor_free(m);
501 void avahi_interface_monitor_free(AvahiInterfaceMonitor *m) {
504 while (m->hw_interfaces)
505 avahi_hw_interface_free(m->hw_interfaces, 1);
507 assert(!m->interfaces);
509 avahi_interface_monitor_free_osdep(m);
512 avahi_hashmap_free(m->hashmap);
518 AvahiInterface* avahi_interface_monitor_get_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx, AvahiProtocol protocol) {
519 AvahiHwInterface *hw;
524 assert(protocol != AVAHI_PROTO_UNSPEC);
526 if (!(hw = avahi_interface_monitor_get_hw_interface(m, idx)))
529 for (i = hw->interfaces; i; i = i->by_hardware_next)
530 if (i->protocol == protocol)
536 AvahiHwInterface* avahi_interface_monitor_get_hw_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx) {
540 return avahi_hashmap_lookup(m->hashmap, &idx);
543 AvahiInterfaceAddress* avahi_interface_monitor_get_address(AvahiInterfaceMonitor *m, AvahiInterface *i, const AvahiAddress *raddr) {
544 AvahiInterfaceAddress *ia;
550 for (ia = i->addresses; ia; ia = ia->address_next)
551 if (avahi_address_cmp(&ia->address, raddr) == 0)
558 void avahi_interface_send_packet_unicast(AvahiInterface *i, AvahiDnsPacket *p, const AvahiAddress *a, uint16_t port) {
561 /* char t[AVAHI_ADDRESS_STR_MAX]; */
563 if (!avahi_interface_is_relevant(i))
566 assert(!a || a->proto == i->protocol);
569 /* avahi_log_debug("unicast sending on '%s.%i' to %s:%u", i->hardware->name, i->protocol, avahi_address_snprint(t, sizeof(t), a), port); */
571 /* avahi_log_debug("multicast sending on '%s.%i'", i->hardware->name, i->protocol); */
573 if (i->protocol == AVAHI_PROTO_INET && i->monitor->server->fd_ipv4 >= 0)
574 avahi_send_dns_packet_ipv4(i->monitor->server->fd_ipv4, i->hardware->index, p, i->mcast_joined ? &i->local_mcast_address.data.ipv4 : NULL, a ? &a->data.ipv4 : NULL, port);
575 else if (i->protocol == AVAHI_PROTO_INET6 && i->monitor->server->fd_ipv6 >= 0)
576 avahi_send_dns_packet_ipv6(i->monitor->server->fd_ipv6, i->hardware->index, p, i->mcast_joined ? &i->local_mcast_address.data.ipv6 : NULL, a ? &a->data.ipv6 : NULL, port);
579 void avahi_interface_send_packet(AvahiInterface *i, AvahiDnsPacket *p) {
583 avahi_interface_send_packet_unicast(i, p, NULL, 0);
586 int avahi_interface_post_query(AvahiInterface *i, AvahiKey *key, int immediately, unsigned *ret_id) {
590 if (avahi_interface_is_relevant(i))
591 return avahi_query_scheduler_post(i->query_scheduler, key, immediately, ret_id);
596 int avahi_interface_withraw_query(AvahiInterface *i, unsigned id) {
598 return avahi_query_scheduler_withdraw_by_id(i->query_scheduler, id);
601 int avahi_interface_post_response(AvahiInterface *i, AvahiRecord *record, int flush_cache, const AvahiAddress *querier, int immediately) {
605 if (avahi_interface_is_relevant(i))
606 return avahi_response_scheduler_post(i->response_scheduler, record, flush_cache, querier, immediately);
611 int avahi_interface_post_probe(AvahiInterface *i, AvahiRecord *record, int immediately) {
615 if (avahi_interface_is_relevant(i))
616 return avahi_probe_scheduler_post(i->probe_scheduler, record, immediately);
621 int avahi_dump_caches(AvahiInterfaceMonitor *m, AvahiDumpCallback callback, void* userdata) {
625 for (i = m->interfaces; i; i = i->interface_next) {
626 if (avahi_interface_is_relevant(i)) {
628 snprintf(ln, sizeof(ln), ";;; INTERFACE %s.%s ;;;", i->hardware->name, avahi_proto_to_string(i->protocol));
629 callback(ln, userdata);
630 if (avahi_cache_dump(i->cache, callback, userdata) < 0)
638 int avahi_interface_is_relevant(AvahiInterface *i) {
639 AvahiInterfaceAddress *a;
640 int relevant_address;
644 relevant_address = 0;
646 for (a = i->addresses; a; a = a->address_next)
647 if (avahi_interface_address_is_relevant(a)) {
648 relevant_address = 1;
652 return i->hardware->flags_ok && relevant_address;
655 int avahi_interface_address_is_relevant(AvahiInterfaceAddress *a) {
656 AvahiInterfaceAddress *b;
659 /* Publish public IP addresses */
664 /* Publish link local IP addresses if they are the only ones on the link */
665 for (b = a->interface->addresses; b; b = b->address_next) {
679 int avahi_interface_match(AvahiInterface *i, AvahiIfIndex idx, AvahiProtocol protocol) {
682 if (idx != AVAHI_IF_UNSPEC && idx != i->hardware->index)
685 if (protocol != AVAHI_PROTO_UNSPEC && protocol != i->protocol)
691 void avahi_interface_monitor_walk(AvahiInterfaceMonitor *m, AvahiIfIndex interface, AvahiProtocol protocol, AvahiInterfaceMonitorWalkCallback callback, void* userdata) {
695 if (interface != AVAHI_IF_UNSPEC) {
696 if (protocol != AVAHI_PROTO_UNSPEC) {
699 if ((i = avahi_interface_monitor_get_interface(m, interface, protocol)))
700 callback(m, i, userdata);
703 AvahiHwInterface *hw;
706 if ((hw = avahi_interface_monitor_get_hw_interface(m, interface)))
707 for (i = hw->interfaces; i; i = i->by_hardware_next)
708 if (avahi_interface_match(i, interface, protocol))
709 callback(m, i, userdata);
715 for (i = m->interfaces; i; i = i->interface_next)
716 if (avahi_interface_match(i, interface, protocol))
717 callback(m, i, userdata);
722 int avahi_address_is_local(AvahiInterfaceMonitor *m, const AvahiAddress *a) {
724 AvahiInterfaceAddress *ia;
728 for (i = m->interfaces; i; i = i->interface_next)
729 for (ia = i->addresses; ia; ia = ia->address_next)
730 if (avahi_address_cmp(a, &ia->address) == 0)
736 int avahi_interface_address_on_link(AvahiInterface *i, const AvahiAddress *a) {
737 AvahiInterfaceAddress *ia;
742 if (a->proto != i->protocol)
745 for (ia = i->addresses; ia; ia = ia->address_next) {
747 if (a->proto == AVAHI_PROTO_INET) {
750 m = ~(((uint32_t) -1) >> ia->prefix_len);
752 if ((ntohl(a->data.ipv4.address) & m) == (ntohl(ia->address.data.ipv4.address) & m))
757 assert(a->proto == AVAHI_PROTO_INET6);
761 for (j = 0; j < 16; j++) {
775 if ((a->data.ipv6.address[j] & m) != (ia->address.data.ipv6.address[j] & m))
784 int avahi_interface_has_address(AvahiInterfaceMonitor *m, AvahiIfIndex iface, const AvahiAddress *a) {
786 AvahiInterfaceAddress *j;
789 assert(iface != AVAHI_IF_UNSPEC);
792 if (!(i = avahi_interface_monitor_get_interface(m, iface, a->proto)))
795 for (j = i->addresses; j; j = j->address_next)
796 if (avahi_address_cmp(a, &j->address) == 0)
802 AvahiIfIndex avahi_find_interface_for_address(AvahiInterfaceMonitor *m, const AvahiAddress *a) {
806 /* Some stupid OS don't support passing the interface index when a
807 * packet is recieved. We have to work around that limitation by
808 * looking for an interface that has the incoming address
809 * attached. This is sometimes ambiguous, but we have to live with
812 for (i = m->interfaces; i; i = i->interface_next) {
813 AvahiInterfaceAddress *ai;
815 if (i->protocol != a->proto)
818 for (ai = i->addresses; ai; ai = ai->address_next)
819 if (avahi_address_cmp(a, &ai->address) == 0)
820 return i->hardware->index;
823 return AVAHI_IF_UNSPEC;