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
27 #include <sys/socket.h>
28 #include <asm/types.h>
29 #include <linux/netlink.h>
30 #include <linux/rtnetlink.h>
43 static void update_address_rr(AvahiInterfaceMonitor *m, AvahiInterfaceAddress *a, gboolean remove_rrs) {
47 if (avahi_interface_address_relevant(a) &&
49 m->server->config.publish_addresses &&
50 (m->server->state == AVAHI_SERVER_RUNNING ||
51 m->server->state == AVAHI_SERVER_REGISTERING)) {
53 /* Fill the entry group */
55 a->entry_group = avahi_entry_group_new(m->server, avahi_host_rr_entry_group_callback, NULL);
57 if (avahi_entry_group_is_empty(a->entry_group)) {
59 if (avahi_server_add_address(m->server, a->entry_group, a->interface->hardware->index, a->interface->protocol, 0, NULL, &a->address) < 0) {
60 avahi_log_warn(__FILE__": avahi_server_add_address() failed.");
61 avahi_entry_group_free(a->entry_group);
62 a->entry_group = NULL;
66 avahi_entry_group_commit(a->entry_group);
70 /* Clear the entry group */
72 if (a->entry_group && !avahi_entry_group_is_empty(a->entry_group)) {
74 if (avahi_entry_group_get_state(a->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING)
75 avahi_server_decrease_host_rr_pending(m->server);
77 avahi_entry_group_reset(a->entry_group);
82 static void update_interface_rr(AvahiInterfaceMonitor *m, AvahiInterface *i, gboolean remove_rrs) {
83 AvahiInterfaceAddress *a;
88 for (a = i->addresses; a; a = a->address_next)
89 update_address_rr(m, a, remove_rrs);
92 static void update_hw_interface_rr(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, gboolean remove_rrs) {
98 for (i = hw->interfaces; i; i = i->by_hardware_next)
99 update_interface_rr(m, i, remove_rrs);
102 m->server->config.publish_workstation &&
103 (m->server->state == AVAHI_SERVER_RUNNING ||
104 m->server->state == AVAHI_SERVER_REGISTERING)) {
106 if (!hw->entry_group)
107 hw->entry_group = avahi_entry_group_new(m->server, avahi_host_rr_entry_group_callback, NULL);
109 if (avahi_entry_group_is_empty(hw->entry_group)) {
111 gchar *t = avahi_format_mac_address(hw->mac_address, hw->mac_address_size);
113 name = g_strdup_printf("%s [%s]", m->server->host_name, t);
116 if (avahi_server_add_service(m->server, hw->entry_group, hw->index, AVAHI_PROTO_UNSPEC, name, "_workstation._tcp", NULL, NULL, 9, NULL) < 0) {
117 avahi_log_warn(__FILE__": avahi_server_add_service() failed.");
118 avahi_entry_group_free(hw->entry_group);
119 hw->entry_group = NULL;
121 avahi_entry_group_commit(hw->entry_group);
128 if (hw->entry_group && !avahi_entry_group_is_empty(hw->entry_group)) {
130 if (avahi_entry_group_get_state(hw->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING)
131 avahi_server_decrease_host_rr_pending(m->server);
133 avahi_entry_group_reset(hw->entry_group);
138 static void free_address(AvahiInterfaceMonitor *m, AvahiInterfaceAddress *a) {
141 g_assert(a->interface);
143 update_address_rr(m, a, TRUE);
144 AVAHI_LLIST_REMOVE(AvahiInterfaceAddress, address, a->interface->addresses, a);
147 avahi_entry_group_free(a->entry_group);
152 static void free_interface(AvahiInterfaceMonitor *m, AvahiInterface *i, gboolean send_goodbye) {
156 avahi_goodbye_interface(m->server, i, send_goodbye);
157 avahi_response_scheduler_force(i->response_scheduler);
159 g_assert(!i->announcements);
161 update_interface_rr(m, i, TRUE);
164 free_address(m, i->addresses);
166 avahi_response_scheduler_free(i->response_scheduler);
167 avahi_query_scheduler_free(i->query_scheduler);
168 avahi_probe_scheduler_free(i->probe_scheduler);
169 avahi_cache_free(i->cache);
171 AVAHI_LLIST_REMOVE(AvahiInterface, interface, m->interfaces, i);
172 AVAHI_LLIST_REMOVE(AvahiInterface, by_hardware, i->hardware->interfaces, i);
177 static void free_hw_interface(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, gboolean send_goodbye) {
181 update_hw_interface_rr(m, hw, TRUE);
183 while (hw->interfaces)
184 free_interface(m, hw->interfaces, send_goodbye);
187 avahi_entry_group_free(hw->entry_group);
189 AVAHI_LLIST_REMOVE(AvahiHwInterface, hardware, m->hw_interfaces, hw);
190 g_hash_table_remove(m->hash_table, &hw->index);
196 static AvahiInterfaceAddress* get_address(AvahiInterfaceMonitor *m, AvahiInterface *i, const AvahiAddress *raddr) {
197 AvahiInterfaceAddress *ia;
203 for (ia = i->addresses; ia; ia = ia->address_next)
204 if (avahi_address_cmp(&ia->address, raddr) == 0)
210 static int netlink_list_items(AvahiNetlink *nl, guint16 type, guint *ret_seq) {
212 struct rtgenmsg *gen;
215 memset(&req, 0, sizeof(req));
216 n = (struct nlmsghdr*) req;
217 n->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg));
218 n->nlmsg_type = type;
219 n->nlmsg_flags = NLM_F_ROOT/*|NLM_F_MATCH*/|NLM_F_REQUEST;
223 memset(gen, 0, sizeof(struct rtgenmsg));
224 gen->rtgen_family = AF_UNSPEC;
226 return avahi_netlink_send(nl, n, ret_seq);
229 static void new_interface(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, AvahiProtocol protocol) {
234 g_assert(protocol != AVAHI_PROTO_UNSPEC);
236 i = g_new(AvahiInterface, 1);
239 i->protocol = protocol;
240 i->announcing = FALSE;
242 AVAHI_LLIST_HEAD_INIT(AvahiInterfaceAddress, i->addresses);
243 AVAHI_LLIST_HEAD_INIT(AvahiAnnouncement, i->announcements);
245 i->cache = avahi_cache_new(m->server, i);
246 i->response_scheduler = avahi_response_scheduler_new(i);
247 i->query_scheduler = avahi_query_scheduler_new(i);
248 i->probe_scheduler = avahi_probe_scheduler_new(i);
250 AVAHI_LLIST_PREPEND(AvahiInterface, by_hardware, hw->interfaces, i);
251 AVAHI_LLIST_PREPEND(AvahiInterface, interface, m->interfaces, i);
254 static void check_interface_relevant(AvahiInterfaceMonitor *m, AvahiInterface *i) {
260 b = avahi_interface_relevant(i);
262 if (b && !i->announcing) {
263 avahi_log_debug("New relevant interface %s.%i (#%i)", i->hardware->name, i->protocol, i->hardware->index);
265 if (i->protocol == AVAHI_PROTO_INET)
266 avahi_mdns_mcast_join_ipv4(m->server->fd_ipv4, i->hardware->index);
267 if (i->protocol == AVAHI_PROTO_INET6)
268 avahi_mdns_mcast_join_ipv6(m->server->fd_ipv6, i->hardware->index);
270 i->announcing = TRUE;
271 avahi_announce_interface(m->server, i);
272 avahi_browser_new_interface(m->server, i);
273 } else if (!b && i->announcing) {
274 avahi_log_debug("Interface %s.%i no longer relevant", i->hardware->name, i->protocol);
276 if (i->protocol == AVAHI_PROTO_INET)
277 avahi_mdns_mcast_leave_ipv4(m->server->fd_ipv4, i->hardware->index);
278 if (i->protocol == AVAHI_PROTO_INET6)
279 avahi_mdns_mcast_leave_ipv6(m->server->fd_ipv6, i->hardware->index);
281 avahi_goodbye_interface(m->server, i, FALSE);
282 avahi_response_scheduler_clear(i->response_scheduler);
283 avahi_query_scheduler_clear(i->query_scheduler);
284 avahi_probe_scheduler_clear(i->probe_scheduler);
285 avahi_cache_flush(i->cache);
287 i->announcing = FALSE;
291 static void check_hw_interface_relevant(AvahiInterfaceMonitor *m, AvahiHwInterface *hw) {
297 for (i = hw->interfaces; i; i = i->by_hardware_next)
298 check_interface_relevant(m, i);
301 static void netlink_callback(AvahiNetlink *nl, struct nlmsghdr *n, gpointer userdata) {
302 AvahiInterfaceMonitor *m = userdata;
306 g_assert(m->netlink == nl);
308 if (n->nlmsg_type == RTM_NEWLINK) {
309 struct ifinfomsg *ifinfomsg = NLMSG_DATA(n);
310 AvahiHwInterface *hw;
311 struct rtattr *a = NULL;
314 if (ifinfomsg->ifi_family != AF_UNSPEC)
317 if (!(hw = g_hash_table_lookup(m->hash_table, &ifinfomsg->ifi_index))) {
318 hw = g_new(AvahiHwInterface, 1);
323 hw->index = (AvahiIfIndex) ifinfomsg->ifi_index;
324 hw->mac_address_size = 0;
325 hw->entry_group = NULL;
327 AVAHI_LLIST_HEAD_INIT(AvahiInterface, hw->interfaces);
328 AVAHI_LLIST_PREPEND(AvahiHwInterface, hardware, m->hw_interfaces, hw);
330 g_hash_table_insert(m->hash_table, &hw->index, hw);
332 if (m->server->fd_ipv4 >= 0)
333 new_interface(m, hw, AVAHI_PROTO_INET);
334 if (m->server->fd_ipv6 >= 0)
335 new_interface(m, hw, AVAHI_PROTO_INET6);
338 hw->flags = ifinfomsg->ifi_flags;
340 l = NLMSG_PAYLOAD(n, sizeof(struct ifinfomsg));
341 a = IFLA_RTA(ifinfomsg);
343 while (RTA_OK(a, l)) {
344 switch(a->rta_type) {
347 hw->name = g_strndup(RTA_DATA(a), RTA_PAYLOAD(a));
351 g_assert(RTA_PAYLOAD(a) == sizeof(unsigned int));
352 hw->mtu = *((unsigned int*) RTA_DATA(a));
356 hw->mac_address_size = RTA_PAYLOAD(a);
357 if (hw->mac_address_size > AVAHI_MAX_MAC_ADDRESS)
358 hw->mac_address_size = AVAHI_MAX_MAC_ADDRESS;
360 memcpy(hw->mac_address, RTA_DATA(a), hw->mac_address_size);
371 update_hw_interface_rr(m, hw, FALSE);
372 check_hw_interface_relevant(m, hw);
374 } else if (n->nlmsg_type == RTM_DELLINK) {
375 struct ifinfomsg *ifinfomsg = NLMSG_DATA(n);
376 AvahiHwInterface *hw;
378 if (ifinfomsg->ifi_family != AF_UNSPEC)
381 if (!(hw = avahi_interface_monitor_get_hw_interface(m, (AvahiIfIndex) ifinfomsg->ifi_index)))
384 update_hw_interface_rr(m, hw, TRUE);
385 free_hw_interface(m, hw, FALSE);
387 } else if (n->nlmsg_type == RTM_NEWADDR || n->nlmsg_type == RTM_DELADDR) {
389 struct ifaddrmsg *ifaddrmsg = NLMSG_DATA(n);
391 struct rtattr *a = NULL;
394 gboolean raddr_valid = FALSE;
396 if (ifaddrmsg->ifa_family != AVAHI_PROTO_INET && ifaddrmsg->ifa_family != AVAHI_PROTO_INET6)
399 if (!(i = (AvahiInterface*) avahi_interface_monitor_get_interface(m, (AvahiIfIndex) ifaddrmsg->ifa_index, (AvahiProtocol) ifaddrmsg->ifa_family)))
402 raddr.family = (AvahiProtocol) ifaddrmsg->ifa_family;
404 l = NLMSG_PAYLOAD(n, sizeof(struct ifaddrmsg));
405 a = IFA_RTA(ifaddrmsg);
407 while (RTA_OK(a, l)) {
409 switch(a->rta_type) {
411 if ((raddr.family == AVAHI_PROTO_INET6 && RTA_PAYLOAD(a) != 16) ||
412 (raddr.family == AVAHI_PROTO_INET && RTA_PAYLOAD(a) != 4))
415 memcpy(raddr.data.data, RTA_DATA(a), RTA_PAYLOAD(a));
430 if (n->nlmsg_type == RTM_NEWADDR) {
431 AvahiInterfaceAddress *addr;
433 if (!(addr = get_address(m, i, &raddr))) {
434 addr = g_new(AvahiInterfaceAddress, 1);
436 addr->address = raddr;
438 addr->entry_group = NULL;
440 AVAHI_LLIST_PREPEND(AvahiInterfaceAddress, address, i->addresses, addr);
443 addr->flags = ifaddrmsg->ifa_flags;
444 addr->scope = ifaddrmsg->ifa_scope;
445 addr->prefix_len = ifaddrmsg->ifa_prefixlen;
447 update_address_rr(m, addr, FALSE);
449 AvahiInterfaceAddress *addr;
451 if (!(addr = get_address(m, i, &raddr)))
454 update_address_rr(m, addr, TRUE);
455 free_address(m, addr);
458 check_interface_relevant(m, i);
460 } else if (n->nlmsg_type == NLMSG_DONE) {
462 if (m->list == LIST_IFACE) {
465 if (netlink_list_items(m->netlink, RTM_GETADDR, &m->query_addr_seq) < 0)
466 avahi_log_warn("NETLINK: Failed to list addrs: %s", strerror(errno));
471 avahi_log_debug("Enumeration complete");
474 } else if (n->nlmsg_type == NLMSG_ERROR && (n->nlmsg_seq == m->query_link_seq || n->nlmsg_seq == m->query_addr_seq)) {
475 struct nlmsgerr *e = NLMSG_DATA (n);
478 avahi_log_warn("NETLINK: Failed to browse: %s", strerror(-e->error));
482 AvahiInterfaceMonitor *avahi_interface_monitor_new(AvahiServer *s) {
483 AvahiInterfaceMonitor *m = NULL;
485 m = g_new0(AvahiInterfaceMonitor, 1);
487 if (!(m->netlink = avahi_netlink_new(s->context, G_PRIORITY_DEFAULT-10, RTMGRP_LINK|RTMGRP_IPV4_IFADDR|RTMGRP_IPV6_IFADDR, netlink_callback, m)))
490 m->hash_table = g_hash_table_new(g_int_hash, g_int_equal);
492 AVAHI_LLIST_HEAD_INIT(AvahiInterface, m->interfaces);
493 AVAHI_LLIST_HEAD_INIT(AvahiHwInterface, m->hw_interfaces);
495 if (netlink_list_items(m->netlink, RTM_GETLINK, &m->query_link_seq) < 0)
498 m->list = LIST_IFACE;
503 avahi_interface_monitor_free(m);
507 void avahi_interface_monitor_sync(AvahiInterfaceMonitor *m) {
510 while (m->list != LIST_DONE) {
511 if (!avahi_netlink_work(m->netlink, TRUE))
516 void avahi_interface_monitor_free(AvahiInterfaceMonitor *m) {
519 while (m->hw_interfaces)
520 free_hw_interface(m, m->hw_interfaces, TRUE);
522 g_assert(!m->interfaces);
526 avahi_netlink_free(m->netlink);
529 g_hash_table_destroy(m->hash_table);
535 AvahiInterface* avahi_interface_monitor_get_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx, AvahiProtocol protocol) {
536 AvahiHwInterface *hw;
541 g_assert(protocol != AVAHI_PROTO_UNSPEC);
543 if (!(hw = avahi_interface_monitor_get_hw_interface(m, idx)))
546 for (i = hw->interfaces; i; i = i->by_hardware_next)
547 if (i->protocol == protocol)
553 AvahiHwInterface* avahi_interface_monitor_get_hw_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx) {
557 return g_hash_table_lookup(m->hash_table, &idx);
561 void avahi_interface_send_packet_unicast(AvahiInterface *i, AvahiDnsPacket *p, const AvahiAddress *a, guint16 port) {
566 if (!avahi_interface_relevant(i))
569 g_assert(!a || a->family == i->protocol);
572 /* avahi_log_debug("unicast sending on '%s.%i' to %s:%u", i->hardware->name, i->protocol, avahi_address_snprint(t, sizeof(t), a), port); */
574 /* avahi_log_debug("multicast sending on '%s.%i'", i->hardware->name, i->protocol); */
576 if (i->protocol == AVAHI_PROTO_INET && i->monitor->server->fd_ipv4 >= 0)
577 avahi_send_dns_packet_ipv4(i->monitor->server->fd_ipv4, i->hardware->index, p, a ? &a->data.ipv4 : NULL, port);
578 else if (i->protocol == AVAHI_PROTO_INET6 && i->monitor->server->fd_ipv6 >= 0)
579 avahi_send_dns_packet_ipv6(i->monitor->server->fd_ipv6, i->hardware->index, p, a ? &a->data.ipv6 : NULL, port);
582 void avahi_interface_send_packet(AvahiInterface *i, AvahiDnsPacket *p) {
586 avahi_interface_send_packet_unicast(i, p, NULL, 0);
589 gboolean avahi_interface_post_query(AvahiInterface *i, AvahiKey *key, gboolean immediately) {
593 if (avahi_interface_relevant(i))
594 return avahi_query_scheduler_post(i->query_scheduler, key, immediately);
599 gboolean avahi_interface_post_response(AvahiInterface *i, AvahiRecord *record, gboolean flush_cache, const AvahiAddress *querier, gboolean immediately) {
603 if (avahi_interface_relevant(i))
604 return avahi_response_scheduler_post(i->response_scheduler, record, flush_cache, querier, immediately);
609 gboolean avahi_interface_post_probe(AvahiInterface *i, AvahiRecord *record, gboolean immediately) {
613 if (avahi_interface_relevant(i))
614 return avahi_probe_scheduler_post(i->probe_scheduler, record, immediately);
619 void avahi_dump_caches(AvahiInterfaceMonitor *m, AvahiDumpCallback callback, gpointer userdata) {
623 for (i = m->interfaces; i; i = i->interface_next) {
624 if (avahi_interface_relevant(i)) {
626 snprintf(ln, sizeof(ln), ";;; INTERFACE %s.%i ;;;", i->hardware->name, i->protocol);
627 callback(ln, userdata);
628 avahi_cache_dump(i->cache, callback, userdata);
633 gboolean avahi_interface_relevant(AvahiInterface *i) {
634 AvahiInterfaceAddress *a;
635 gboolean relevant_address;
639 relevant_address = FALSE;
641 for (a = i->addresses; a; a = a->address_next)
642 if (avahi_interface_address_relevant(a)) {
643 relevant_address = TRUE;
647 /* avahi_log_debug("%p. iface-relevant: %i %i %i %i %i %i", i, relevant_address, */
648 /* (i->hardware->flags & IFF_UP), */
649 /* (i->hardware->flags & IFF_RUNNING), */
650 /* !(i->hardware->flags & IFF_LOOPBACK), */
651 /* (i->hardware->flags & IFF_MULTICAST), */
652 /* !(i->hardware->flags & IFF_POINTOPOINT)); */
655 (i->hardware->flags & IFF_UP) &&
656 (!i->monitor->server->config.use_iff_running || (i->hardware->flags & IFF_RUNNING)) &&
657 !(i->hardware->flags & IFF_LOOPBACK) &&
658 (i->hardware->flags & IFF_MULTICAST) &&
659 !(i->hardware->flags & IFF_POINTOPOINT) &&
663 gboolean avahi_interface_address_relevant(AvahiInterfaceAddress *a) {
666 return a->scope == RT_SCOPE_UNIVERSE;
670 gboolean avahi_interface_match(AvahiInterface *i, AvahiIfIndex idx, AvahiProtocol protocol) {
673 if (idx > 0 && idx != i->hardware->index)
676 if (protocol != AVAHI_PROTO_UNSPEC && protocol != i->protocol)
682 void avahi_interface_monitor_walk(AvahiInterfaceMonitor *m, AvahiIfIndex interface, AvahiProtocol protocol, AvahiInterfaceMonitorWalkCallback callback, gpointer userdata) {
687 if (protocol != AVAHI_PROTO_UNSPEC) {
690 if ((i = avahi_interface_monitor_get_interface(m, interface, protocol)))
691 callback(m, i, userdata);
694 AvahiHwInterface *hw;
697 if ((hw = avahi_interface_monitor_get_hw_interface(m, interface)))
698 for (i = hw->interfaces; i; i = i->by_hardware_next)
699 if (avahi_interface_match(i, interface, protocol))
700 callback(m, i, userdata);
706 for (i = m->interfaces; i; i = i->interface_next)
707 if (avahi_interface_match(i, interface, protocol))
708 callback(m, i, userdata);
712 void avahi_update_host_rrs(AvahiInterfaceMonitor *m, gboolean remove_rrs) {
713 AvahiHwInterface *hw;
717 for (hw = m->hw_interfaces; hw; hw = hw->hardware_next)
718 update_hw_interface_rr(m, hw, remove_rrs);
721 gboolean avahi_address_is_local(AvahiInterfaceMonitor *m, const AvahiAddress *a) {
723 AvahiInterfaceAddress *ia;
727 for (i = m->interfaces; i; i = i->interface_next)
728 for (ia = i->addresses; ia; ia = ia->address_next)
729 if (avahi_address_cmp(a, &ia->address) == 0)
735 gboolean avahi_interface_address_on_link(AvahiInterface *i, const AvahiAddress *a) {
736 AvahiInterfaceAddress *ia;
741 if (a->family != i->protocol)
744 for (ia = i->addresses; ia; ia = ia->address_next) {
746 if (a->family == AVAHI_PROTO_INET) {
749 m = ~(((guint32) -1) >> ia->prefix_len);
751 if ((g_ntohl(a->data.ipv4.address) & m) == (g_ntohl(ia->address.data.ipv4.address) & m))
756 g_assert(a->family == AVAHI_PROTO_INET6);
760 for (j = 0; j < 16; j++) {
774 if ((a->data.ipv6.address[j] & m) != (ia->address.data.ipv6.address[j] & m))