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 <sys/types.h>
31 #include <sys/socket.h>
32 #include <netinet/in.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)) {
126 if (!hw->entry_group)
127 hw->entry_group = avahi_s_entry_group_new(m->server, avahi_host_rr_entry_group_callback, NULL);
129 if (!hw->entry_group)
132 if (avahi_s_entry_group_is_empty(hw->entry_group)) {
133 char name[AVAHI_LABEL_MAX], mac[256];
135 avahi_format_mac_address(mac, sizeof(mac), hw->mac_address, hw->mac_address_size);
136 snprintf(name, sizeof(name), "%s [%s]", m->server->host_name, mac);
138 if (avahi_server_add_service(m->server, hw->entry_group, hw->index, AVAHI_PROTO_UNSPEC, 0, name, "_workstation._tcp", NULL, NULL, 9, NULL) < 0) {
139 avahi_log_warn(__FILE__": avahi_server_add_service() failed: %s", avahi_strerror(m->server->error));
140 avahi_s_entry_group_free(hw->entry_group);
141 hw->entry_group = NULL;
143 avahi_s_entry_group_commit(hw->entry_group);
148 if (hw->entry_group && !avahi_s_entry_group_is_empty(hw->entry_group)) {
150 if (avahi_s_entry_group_get_state(hw->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING)
151 avahi_server_decrease_host_rr_pending(m->server);
153 avahi_s_entry_group_reset(hw->entry_group);
158 void avahi_interface_monitor_update_rrs(AvahiInterfaceMonitor *m, int remove_rrs) {
159 AvahiHwInterface *hw;
163 for (hw = m->hw_interfaces; hw; hw = hw->hardware_next)
164 avahi_hw_interface_update_rrs(hw, remove_rrs);
167 static int interface_mdns_mcast_join(AvahiInterface *i, int join) {
168 char at[AVAHI_ADDRESS_STR_MAX];
172 if (!!join == !!i->mcast_joined)
176 AvahiInterfaceAddress *a;
178 /* Look if there's an address with global scope */
179 for (a = i->addresses; a; a = a->address_next)
183 /* No address with a global scope has been found, so let's use
188 /* Hmm, there is no address available. */
190 avahi_log_warn(__FILE__": interface_mdns_mcast_join() called but no local address available.");
194 i->local_mcast_address = a->address;
197 avahi_log_info("%s mDNS multicast group on interface %s.%s with address %s.",
198 join ? "Joining" : "Leaving",
200 avahi_proto_to_string(i->protocol),
201 avahi_address_snprint(at, sizeof(at), &i->local_mcast_address));
203 if (i->protocol == AVAHI_PROTO_INET6)
204 r = avahi_mdns_mcast_join_ipv6(i->monitor->server->fd_ipv6, &i->local_mcast_address.data.ipv6, i->hardware->index, join);
206 assert(i->protocol == AVAHI_PROTO_INET);
208 r = avahi_mdns_mcast_join_ipv4(i->monitor->server->fd_ipv4, &i->local_mcast_address.data.ipv4, i->hardware->index, join);
214 i->mcast_joined = join;
219 static int interface_mdns_mcast_rejoin(AvahiInterface *i) {
220 AvahiInterfaceAddress *a, *usable = NULL, *found = NULL;
223 if (!i->mcast_joined)
226 /* Check whether old address we joined with is still available. If
227 * not, rejoin using an other address. */
229 for (a = i->addresses; a; a = a->address_next) {
230 if (a->global_scope && !usable)
233 if (avahi_address_cmp(&a->address, &i->local_mcast_address) == 0) {
236 /* No action necessary: the address still exists and
237 * has global scope. */
244 if (found && !usable)
245 /* No action necessary: the address still exists and no better one has been found */
248 interface_mdns_mcast_join(i, 0);
249 return interface_mdns_mcast_join(i, 1);
252 void avahi_interface_address_free(AvahiInterfaceAddress *a) {
254 assert(a->interface);
256 avahi_interface_address_update_rrs(a, 1);
257 AVAHI_LLIST_REMOVE(AvahiInterfaceAddress, address, a->interface->addresses, a);
260 avahi_s_entry_group_free(a->entry_group);
262 interface_mdns_mcast_rejoin(a->interface);
267 void avahi_interface_free(AvahiInterface *i, int send_goodbye) {
270 /* Handle goodbyes and remove announcers */
271 avahi_goodbye_interface(i->monitor->server, i, send_goodbye, 1);
272 avahi_response_scheduler_force(i->response_scheduler);
273 assert(!i->announcers);
276 interface_mdns_mcast_join(i, 0);
278 /* Remove queriers */
279 avahi_querier_free_all(i);
280 avahi_hashmap_free(i->queriers_by_key);
282 /* Remove local RRs */
283 avahi_interface_update_rrs(i, 1);
286 avahi_interface_address_free(i->addresses);
288 avahi_response_scheduler_free(i->response_scheduler);
289 avahi_query_scheduler_free(i->query_scheduler);
290 avahi_probe_scheduler_free(i->probe_scheduler);
291 avahi_cache_free(i->cache);
293 AVAHI_LLIST_REMOVE(AvahiInterface, interface, i->monitor->interfaces, i);
294 AVAHI_LLIST_REMOVE(AvahiInterface, by_hardware, i->hardware->interfaces, i);
299 void avahi_hw_interface_free(AvahiHwInterface *hw, int send_goodbye) {
302 avahi_hw_interface_update_rrs(hw, 1);
304 while (hw->interfaces)
305 avahi_interface_free(hw->interfaces, send_goodbye);
308 avahi_s_entry_group_free(hw->entry_group);
310 AVAHI_LLIST_REMOVE(AvahiHwInterface, hardware, hw->monitor->hw_interfaces, hw);
311 avahi_hashmap_remove(hw->monitor->hashmap, &hw->index);
313 avahi_free(hw->name);
317 AvahiInterface* avahi_interface_new(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, AvahiProtocol protocol) {
322 assert(AVAHI_PROTO_VALID(protocol));
324 if (!(i = avahi_new(AvahiInterface, 1)))
329 i->protocol = protocol;
333 AVAHI_LLIST_HEAD_INIT(AvahiInterfaceAddress, i->addresses);
334 AVAHI_LLIST_HEAD_INIT(AvahiAnnouncer, i->announcers);
336 AVAHI_LLIST_HEAD_INIT(AvahiQuerier, i->queriers);
337 i->queriers_by_key = avahi_hashmap_new((AvahiHashFunc) avahi_key_hash, (AvahiEqualFunc) avahi_key_equal, NULL, NULL);
339 i->cache = avahi_cache_new(m->server, i);
340 i->response_scheduler = avahi_response_scheduler_new(i);
341 i->query_scheduler = avahi_query_scheduler_new(i);
342 i->probe_scheduler = avahi_probe_scheduler_new(i);
344 if (!i->cache || !i->response_scheduler || !i->query_scheduler || !i->probe_scheduler)
347 AVAHI_LLIST_PREPEND(AvahiInterface, by_hardware, hw->interfaces, i);
348 AVAHI_LLIST_PREPEND(AvahiInterface, interface, m->interfaces, i);
356 avahi_cache_free(i->cache);
357 if (i->response_scheduler)
358 avahi_response_scheduler_free(i->response_scheduler);
359 if (i->query_scheduler)
360 avahi_query_scheduler_free(i->query_scheduler);
361 if (i->probe_scheduler)
362 avahi_probe_scheduler_free(i->probe_scheduler);
368 AvahiHwInterface *avahi_hw_interface_new(AvahiInterfaceMonitor *m, AvahiIfIndex idx) {
369 AvahiHwInterface *hw;
372 assert(AVAHI_IF_VALID(idx));
374 if (!(hw = avahi_new(AvahiHwInterface, 1)))
382 hw->mac_address_size = 0;
383 hw->entry_group = NULL;
385 AVAHI_LLIST_HEAD_INIT(AvahiInterface, hw->interfaces);
386 AVAHI_LLIST_PREPEND(AvahiHwInterface, hardware, m->hw_interfaces, hw);
388 avahi_hashmap_insert(m->hashmap, &hw->index, hw);
390 if (m->server->fd_ipv4 >= 0)
391 avahi_interface_new(m, hw, AVAHI_PROTO_INET);
392 if (m->server->fd_ipv6 >= 0)
393 avahi_interface_new(m, hw, AVAHI_PROTO_INET6);
398 AvahiInterfaceAddress *avahi_interface_address_new(AvahiInterfaceMonitor *m, AvahiInterface *i, const AvahiAddress *addr, unsigned prefix_len) {
399 AvahiInterfaceAddress *a;
404 if (!(a = avahi_new(AvahiInterfaceAddress, 1)))
410 a->prefix_len = prefix_len;
412 a->entry_group = NULL;
414 AVAHI_LLIST_PREPEND(AvahiInterfaceAddress, address, i->addresses, a);
419 void avahi_interface_check_relevant(AvahiInterface *i) {
421 AvahiInterfaceMonitor *m;
426 b = avahi_interface_is_relevant(i);
428 if (m->list_complete && b && !i->announcing) {
429 avahi_log_info("New relevant interface %s.%s for mDNS.", i->hardware->name, avahi_proto_to_string(i->protocol));
431 interface_mdns_mcast_join(i, 1);
434 avahi_announce_interface(m->server, i);
435 avahi_multicast_lookup_engine_new_interface(m->server->multicast_lookup_engine, i);
436 } else if (!b && i->announcing) {
437 avahi_log_info("Interface %s.%s no longer relevant for mDNS.", i->hardware->name, avahi_proto_to_string(i->protocol));
439 interface_mdns_mcast_join(i, 0);
441 avahi_goodbye_interface(m->server, i, 0, 1);
442 avahi_querier_free_all(i);
444 avahi_response_scheduler_clear(i->response_scheduler);
445 avahi_query_scheduler_clear(i->query_scheduler);
446 avahi_probe_scheduler_clear(i->probe_scheduler);
447 avahi_cache_flush(i->cache);
452 interface_mdns_mcast_rejoin(i);
455 void avahi_hw_interface_check_relevant(AvahiHwInterface *hw) {
460 for (i = hw->interfaces; i; i = i->by_hardware_next)
461 avahi_interface_check_relevant(i);
464 void avahi_interface_monitor_check_relevant(AvahiInterfaceMonitor *m) {
469 for (i = m->interfaces; i; i = i->interface_next)
470 avahi_interface_check_relevant(i);
473 AvahiInterfaceMonitor *avahi_interface_monitor_new(AvahiServer *s) {
474 AvahiInterfaceMonitor *m = NULL;
476 if (!(m = avahi_new0(AvahiInterfaceMonitor, 1)))
477 return NULL; /* OOM */
480 m->list_complete = 0;
481 m->hashmap = avahi_hashmap_new(avahi_int_hash, avahi_int_equal, NULL, NULL);
483 AVAHI_LLIST_HEAD_INIT(AvahiInterface, m->interfaces);
484 AVAHI_LLIST_HEAD_INIT(AvahiHwInterface, m->hw_interfaces);
486 if (avahi_interface_monitor_init_osdep(m) < 0)
492 avahi_interface_monitor_free(m);
496 void avahi_interface_monitor_free(AvahiInterfaceMonitor *m) {
499 while (m->hw_interfaces)
500 avahi_hw_interface_free(m->hw_interfaces, 1);
502 assert(!m->interfaces);
504 avahi_interface_monitor_free_osdep(m);
507 avahi_hashmap_free(m->hashmap);
513 AvahiInterface* avahi_interface_monitor_get_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx, AvahiProtocol protocol) {
514 AvahiHwInterface *hw;
519 assert(protocol != AVAHI_PROTO_UNSPEC);
521 if (!(hw = avahi_interface_monitor_get_hw_interface(m, idx)))
524 for (i = hw->interfaces; i; i = i->by_hardware_next)
525 if (i->protocol == protocol)
531 AvahiHwInterface* avahi_interface_monitor_get_hw_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx) {
535 return avahi_hashmap_lookup(m->hashmap, &idx);
538 AvahiInterfaceAddress* avahi_interface_monitor_get_address(AvahiInterfaceMonitor *m, AvahiInterface *i, const AvahiAddress *raddr) {
539 AvahiInterfaceAddress *ia;
545 for (ia = i->addresses; ia; ia = ia->address_next)
546 if (avahi_address_cmp(&ia->address, raddr) == 0)
552 void avahi_interface_send_packet_unicast(AvahiInterface *i, AvahiDnsPacket *p, const AvahiAddress *a, uint16_t port) {
556 if (!avahi_interface_is_relevant(i))
559 assert(!a || a->proto == i->protocol);
561 if (i->protocol == AVAHI_PROTO_INET && i->monitor->server->fd_ipv4 >= 0)
562 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);
563 else if (i->protocol == AVAHI_PROTO_INET6 && i->monitor->server->fd_ipv6 >= 0)
564 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);
567 void avahi_interface_send_packet(AvahiInterface *i, AvahiDnsPacket *p) {
571 avahi_interface_send_packet_unicast(i, p, NULL, 0);
574 int avahi_interface_post_query(AvahiInterface *i, AvahiKey *key, int immediately, unsigned *ret_id) {
578 if (avahi_interface_is_relevant(i))
579 return avahi_query_scheduler_post(i->query_scheduler, key, immediately, ret_id);
584 int avahi_interface_withraw_query(AvahiInterface *i, unsigned id) {
586 return avahi_query_scheduler_withdraw_by_id(i->query_scheduler, id);
589 int avahi_interface_post_response(AvahiInterface *i, AvahiRecord *record, int flush_cache, const AvahiAddress *querier, int immediately) {
593 if (avahi_interface_is_relevant(i))
594 return avahi_response_scheduler_post(i->response_scheduler, record, flush_cache, querier, immediately);
599 int avahi_interface_post_probe(AvahiInterface *i, AvahiRecord *record, int immediately) {
603 if (avahi_interface_is_relevant(i))
604 return avahi_probe_scheduler_post(i->probe_scheduler, record, immediately);
609 int avahi_dump_caches(AvahiInterfaceMonitor *m, AvahiDumpCallback callback, void* userdata) {
613 for (i = m->interfaces; i; i = i->interface_next) {
614 if (avahi_interface_is_relevant(i)) {
616 snprintf(ln, sizeof(ln), ";;; INTERFACE %s.%s ;;;", i->hardware->name, avahi_proto_to_string(i->protocol));
617 callback(ln, userdata);
618 if (avahi_cache_dump(i->cache, callback, userdata) < 0)
626 int avahi_interface_is_relevant(AvahiInterface *i) {
627 AvahiInterfaceAddress *a;
628 int relevant_address;
632 relevant_address = 0;
634 for (a = i->addresses; a; a = a->address_next)
635 if (avahi_interface_address_is_relevant(a)) {
636 relevant_address = 1;
640 return i->hardware->flags_ok && relevant_address;
643 int avahi_interface_address_is_relevant(AvahiInterfaceAddress *a) {
644 AvahiInterfaceAddress *b;
647 /* Publish public IP addresses */
652 /* Publish link local IP addresses if they are the only ones on the link */
653 for (b = a->interface->addresses; b; b = b->address_next) {
667 int avahi_interface_match(AvahiInterface *i, AvahiIfIndex idx, AvahiProtocol protocol) {
670 if (idx != AVAHI_IF_UNSPEC && idx != i->hardware->index)
673 if (protocol != AVAHI_PROTO_UNSPEC && protocol != i->protocol)
679 void avahi_interface_monitor_walk(AvahiInterfaceMonitor *m, AvahiIfIndex interface, AvahiProtocol protocol, AvahiInterfaceMonitorWalkCallback callback, void* userdata) {
683 if (interface != AVAHI_IF_UNSPEC) {
684 if (protocol != AVAHI_PROTO_UNSPEC) {
687 if ((i = avahi_interface_monitor_get_interface(m, interface, protocol)))
688 callback(m, i, userdata);
691 AvahiHwInterface *hw;
694 if ((hw = avahi_interface_monitor_get_hw_interface(m, interface)))
695 for (i = hw->interfaces; i; i = i->by_hardware_next)
696 if (avahi_interface_match(i, interface, protocol))
697 callback(m, i, userdata);
703 for (i = m->interfaces; i; i = i->interface_next)
704 if (avahi_interface_match(i, interface, protocol))
705 callback(m, i, userdata);
710 int avahi_address_is_local(AvahiInterfaceMonitor *m, const AvahiAddress *a) {
712 AvahiInterfaceAddress *ia;
716 for (i = m->interfaces; i; i = i->interface_next)
717 for (ia = i->addresses; ia; ia = ia->address_next)
718 if (avahi_address_cmp(a, &ia->address) == 0)
724 int avahi_interface_address_on_link(AvahiInterface *i, const AvahiAddress *a) {
725 AvahiInterfaceAddress *ia;
730 if (a->proto != i->protocol)
733 for (ia = i->addresses; ia; ia = ia->address_next) {
735 if (a->proto == AVAHI_PROTO_INET) {
738 m = ~(((uint32_t) -1) >> ia->prefix_len);
740 if ((ntohl(a->data.ipv4.address) & m) == (ntohl(ia->address.data.ipv4.address) & m))
745 assert(a->proto == AVAHI_PROTO_INET6);
749 for (j = 0; j < 16; j++) {
763 if ((a->data.ipv6.address[j] & m) != (ia->address.data.ipv6.address[j] & m))
772 int avahi_interface_has_address(AvahiInterfaceMonitor *m, AvahiIfIndex iface, const AvahiAddress *a) {
774 AvahiInterfaceAddress *j;
777 assert(iface != AVAHI_IF_UNSPEC);
780 if (!(i = avahi_interface_monitor_get_interface(m, iface, a->proto)))
783 for (j = i->addresses; j; j = j->address_next)
784 if (avahi_address_cmp(a, &j->address) == 0)
790 AvahiIfIndex avahi_find_interface_for_address(AvahiInterfaceMonitor *m, const AvahiAddress *a) {
794 /* Some stupid OS don't support passing the interface index when a
795 * packet is recieved. We have to work around that limitation by
796 * looking for an interface that has the incoming address
797 * attached. This is sometimes ambiguous, but we have to live with
800 for (i = m->interfaces; i; i = i->interface_next) {
801 AvahiInterfaceAddress *ai;
803 if (i->protocol != a->proto)
806 for (ai = i->addresses; ai; ai = ai->address_next)
807 if (avahi_address_cmp(a, &ai->address) == 0)
808 return i->hardware->index;
811 return AVAHI_IF_UNSPEC;