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>
35 #include <avahi-common/error.h>
36 #include <avahi-common/malloc.h>
46 static void update_address_rr(AvahiInterfaceMonitor *m, AvahiInterfaceAddress *a, int remove_rrs) {
50 if (avahi_interface_address_relevant(a) &&
52 m->server->config.publish_addresses &&
53 (m->server->state == AVAHI_SERVER_RUNNING ||
54 m->server->state == AVAHI_SERVER_REGISTERING)) {
56 /* Fill the entry group */
58 a->entry_group = avahi_s_entry_group_new(m->server, avahi_host_rr_entry_group_callback, NULL);
60 if (!a->entry_group) /* OOM */
63 if (avahi_s_entry_group_is_empty(a->entry_group)) {
65 avahi_address_snprint(t, sizeof(t), &a->address);
67 avahi_log_info("Registering new address %s on %s.", t, a->interface->hardware->name);
69 if (avahi_server_add_address(m->server, a->entry_group, a->interface->hardware->index, a->interface->protocol, 0, NULL, &a->address) < 0) {
70 avahi_log_warn(__FILE__": avahi_server_add_address() failed: %s", avahi_strerror(m->server->error));
71 avahi_s_entry_group_free(a->entry_group);
72 a->entry_group = NULL;
76 avahi_s_entry_group_commit(a->entry_group);
80 /* Clear the entry group */
82 if (a->entry_group && !avahi_s_entry_group_is_empty(a->entry_group)) {
84 avahi_address_snprint(t, sizeof(t), &a->address);
86 if (avahi_s_entry_group_get_state(a->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING)
87 avahi_server_decrease_host_rr_pending(m->server);
89 avahi_log_info("Withdrawing address %s on %s.", t, a->interface->hardware->name);
91 avahi_s_entry_group_reset(a->entry_group);
96 static void update_interface_rr(AvahiInterfaceMonitor *m, AvahiInterface *i, int remove_rrs) {
97 AvahiInterfaceAddress *a;
102 for (a = i->addresses; a; a = a->address_next)
103 update_address_rr(m, a, remove_rrs);
106 static void update_hw_interface_rr(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, int remove_rrs) {
112 for (i = hw->interfaces; i; i = i->by_hardware_next)
113 update_interface_rr(m, i, remove_rrs);
116 m->server->config.publish_workstation &&
117 (m->server->state == AVAHI_SERVER_RUNNING ||
118 m->server->state == AVAHI_SERVER_REGISTERING)) {
120 if (!hw->entry_group)
121 hw->entry_group = avahi_s_entry_group_new(m->server, avahi_host_rr_entry_group_callback, NULL);
123 if (!hw->entry_group)
126 if (avahi_s_entry_group_is_empty(hw->entry_group)) {
130 if (!(t = avahi_format_mac_address(hw->mac_address, hw->mac_address_size)))
133 name = avahi_strdup_printf("%s [%s]", m->server->host_name, t);
139 if (avahi_server_add_service(m->server, hw->entry_group, hw->index, AVAHI_PROTO_UNSPEC, name, "_workstation._tcp", NULL, NULL, 9, NULL) < 0) {
140 avahi_log_warn(__FILE__": avahi_server_add_service() failed.");
141 avahi_s_entry_group_free(hw->entry_group);
142 hw->entry_group = NULL;
144 avahi_s_entry_group_commit(hw->entry_group);
151 if (hw->entry_group && !avahi_s_entry_group_is_empty(hw->entry_group)) {
153 if (avahi_s_entry_group_get_state(hw->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING)
154 avahi_server_decrease_host_rr_pending(m->server);
156 avahi_s_entry_group_reset(hw->entry_group);
161 static void free_address(AvahiInterfaceMonitor *m, AvahiInterfaceAddress *a) {
164 assert(a->interface);
166 update_address_rr(m, a, 1);
167 AVAHI_LLIST_REMOVE(AvahiInterfaceAddress, address, a->interface->addresses, a);
170 avahi_s_entry_group_free(a->entry_group);
175 static void free_interface(AvahiInterfaceMonitor *m, AvahiInterface *i, int send_goodbye) {
179 avahi_goodbye_interface(m->server, i, send_goodbye);
180 avahi_response_scheduler_force(i->response_scheduler);
182 assert(!i->announcements);
184 update_interface_rr(m, i, 1);
187 free_address(m, i->addresses);
189 avahi_response_scheduler_free(i->response_scheduler);
190 avahi_query_scheduler_free(i->query_scheduler);
191 avahi_probe_scheduler_free(i->probe_scheduler);
192 avahi_cache_free(i->cache);
194 AVAHI_LLIST_REMOVE(AvahiInterface, interface, m->interfaces, i);
195 AVAHI_LLIST_REMOVE(AvahiInterface, by_hardware, i->hardware->interfaces, i);
200 static void free_hw_interface(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, int send_goodbye) {
204 update_hw_interface_rr(m, hw, 1);
206 while (hw->interfaces)
207 free_interface(m, hw->interfaces, send_goodbye);
210 avahi_s_entry_group_free(hw->entry_group);
212 AVAHI_LLIST_REMOVE(AvahiHwInterface, hardware, m->hw_interfaces, hw);
213 avahi_hashmap_remove(m->hashmap, &hw->index);
215 avahi_free(hw->name);
219 static AvahiInterfaceAddress* get_address(AvahiInterfaceMonitor *m, AvahiInterface *i, const AvahiAddress *raddr) {
220 AvahiInterfaceAddress *ia;
226 for (ia = i->addresses; ia; ia = ia->address_next)
227 if (avahi_address_cmp(&ia->address, raddr) == 0)
233 static int netlink_list_items(AvahiNetlink *nl, uint16_t type, unsigned *ret_seq) {
235 struct rtgenmsg *gen;
238 memset(&req, 0, sizeof(req));
239 n = (struct nlmsghdr*) req;
240 n->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg));
241 n->nlmsg_type = type;
242 n->nlmsg_flags = NLM_F_ROOT/*|NLM_F_MATCH*/|NLM_F_REQUEST;
246 memset(gen, 0, sizeof(struct rtgenmsg));
247 gen->rtgen_family = AF_UNSPEC;
249 return avahi_netlink_send(nl, n, ret_seq);
252 static void new_interface(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, AvahiProtocol protocol) {
257 assert(protocol != AVAHI_PROTO_UNSPEC);
259 if (!(i = avahi_new(AvahiInterface, 1)))
264 i->protocol = protocol;
267 AVAHI_LLIST_HEAD_INIT(AvahiInterfaceAddress, i->addresses);
268 AVAHI_LLIST_HEAD_INIT(AvahiAnnouncement, i->announcements);
270 i->cache = avahi_cache_new(m->server, i);
271 i->response_scheduler = avahi_response_scheduler_new(i);
272 i->query_scheduler = avahi_query_scheduler_new(i);
273 i->probe_scheduler = avahi_probe_scheduler_new(i);
275 if (!i->cache || !i->response_scheduler || !i->query_scheduler || !i->probe_scheduler)
278 AVAHI_LLIST_PREPEND(AvahiInterface, by_hardware, hw->interfaces, i);
279 AVAHI_LLIST_PREPEND(AvahiInterface, interface, m->interfaces, i);
286 avahi_cache_free(i->cache);
287 if (i->response_scheduler)
288 avahi_response_scheduler_free(i->response_scheduler);
289 if (i->query_scheduler)
290 avahi_query_scheduler_free(i->query_scheduler);
291 if (i->probe_scheduler)
292 avahi_probe_scheduler_free(i->probe_scheduler);
297 static void check_interface_relevant(AvahiInterfaceMonitor *m, AvahiInterface *i) {
303 b = avahi_interface_relevant(i);
305 if (b && !i->announcing) {
306 avahi_log_debug("New relevant interface %s.%i (#%i)", i->hardware->name, i->protocol, i->hardware->index);
308 if (i->protocol == AVAHI_PROTO_INET)
309 avahi_mdns_mcast_join_ipv4(m->server->fd_ipv4, i->hardware->index);
310 if (i->protocol == AVAHI_PROTO_INET6)
311 avahi_mdns_mcast_join_ipv6(m->server->fd_ipv6, i->hardware->index);
314 avahi_announce_interface(m->server, i);
315 avahi_browser_new_interface(m->server, i);
316 } else if (!b && i->announcing) {
317 avahi_log_debug("Interface %s.%i no longer relevant", i->hardware->name, i->protocol);
319 if (i->protocol == AVAHI_PROTO_INET)
320 avahi_mdns_mcast_leave_ipv4(m->server->fd_ipv4, i->hardware->index);
321 if (i->protocol == AVAHI_PROTO_INET6)
322 avahi_mdns_mcast_leave_ipv6(m->server->fd_ipv6, i->hardware->index);
324 avahi_goodbye_interface(m->server, i, 0);
325 avahi_response_scheduler_clear(i->response_scheduler);
326 avahi_query_scheduler_clear(i->query_scheduler);
327 avahi_probe_scheduler_clear(i->probe_scheduler);
328 avahi_cache_flush(i->cache);
334 static void check_hw_interface_relevant(AvahiInterfaceMonitor *m, AvahiHwInterface *hw) {
340 for (i = hw->interfaces; i; i = i->by_hardware_next)
341 check_interface_relevant(m, i);
344 static void netlink_callback(AvahiNetlink *nl, struct nlmsghdr *n, void* userdata) {
345 AvahiInterfaceMonitor *m = userdata;
349 assert(m->netlink == nl);
351 if (n->nlmsg_type == RTM_NEWLINK) {
352 struct ifinfomsg *ifinfomsg = NLMSG_DATA(n);
353 AvahiHwInterface *hw;
354 struct rtattr *a = NULL;
357 if (ifinfomsg->ifi_family != AF_UNSPEC)
360 if (!(hw = avahi_hashmap_lookup(m->hashmap, &ifinfomsg->ifi_index))) {
362 if (!(hw = avahi_new(AvahiHwInterface, 1)))
369 hw->index = (AvahiIfIndex) ifinfomsg->ifi_index;
370 hw->mac_address_size = 0;
371 hw->entry_group = NULL;
373 AVAHI_LLIST_HEAD_INIT(AvahiInterface, hw->interfaces);
374 AVAHI_LLIST_PREPEND(AvahiHwInterface, hardware, m->hw_interfaces, hw);
376 avahi_hashmap_insert(m->hashmap, &hw->index, hw);
378 if (m->server->fd_ipv4 >= 0)
379 new_interface(m, hw, AVAHI_PROTO_INET);
380 if (m->server->fd_ipv6 >= 0)
381 new_interface(m, hw, AVAHI_PROTO_INET6);
384 hw->flags = ifinfomsg->ifi_flags;
386 l = NLMSG_PAYLOAD(n, sizeof(struct ifinfomsg));
387 a = IFLA_RTA(ifinfomsg);
389 while (RTA_OK(a, l)) {
390 switch(a->rta_type) {
392 avahi_free(hw->name);
393 hw->name = avahi_strndup(RTA_DATA(a), RTA_PAYLOAD(a));
397 assert(RTA_PAYLOAD(a) == sizeof(unsigned int));
398 hw->mtu = *((unsigned int*) RTA_DATA(a));
402 hw->mac_address_size = RTA_PAYLOAD(a);
403 if (hw->mac_address_size > AVAHI_MAX_MAC_ADDRESS)
404 hw->mac_address_size = AVAHI_MAX_MAC_ADDRESS;
406 memcpy(hw->mac_address, RTA_DATA(a), hw->mac_address_size);
417 update_hw_interface_rr(m, hw, 0);
418 check_hw_interface_relevant(m, hw);
420 } else if (n->nlmsg_type == RTM_DELLINK) {
421 struct ifinfomsg *ifinfomsg = NLMSG_DATA(n);
422 AvahiHwInterface *hw;
424 if (ifinfomsg->ifi_family != AF_UNSPEC)
427 if (!(hw = avahi_interface_monitor_get_hw_interface(m, (AvahiIfIndex) ifinfomsg->ifi_index)))
430 update_hw_interface_rr(m, hw, 1);
431 free_hw_interface(m, hw, 0);
433 } else if (n->nlmsg_type == RTM_NEWADDR || n->nlmsg_type == RTM_DELADDR) {
435 struct ifaddrmsg *ifaddrmsg = NLMSG_DATA(n);
437 struct rtattr *a = NULL;
442 if (ifaddrmsg->ifa_family != AVAHI_PROTO_INET && ifaddrmsg->ifa_family != AVAHI_PROTO_INET6)
445 if (!(i = (AvahiInterface*) avahi_interface_monitor_get_interface(m, (AvahiIfIndex) ifaddrmsg->ifa_index, (AvahiProtocol) ifaddrmsg->ifa_family)))
448 raddr.family = (AvahiProtocol) ifaddrmsg->ifa_family;
450 l = NLMSG_PAYLOAD(n, sizeof(struct ifaddrmsg));
451 a = IFA_RTA(ifaddrmsg);
453 while (RTA_OK(a, l)) {
455 switch(a->rta_type) {
457 if ((raddr.family == AVAHI_PROTO_INET6 && RTA_PAYLOAD(a) != 16) ||
458 (raddr.family == AVAHI_PROTO_INET && RTA_PAYLOAD(a) != 4))
461 memcpy(raddr.data.data, RTA_DATA(a), RTA_PAYLOAD(a));
476 if (n->nlmsg_type == RTM_NEWADDR) {
477 AvahiInterfaceAddress *addr;
479 if (!(addr = get_address(m, i, &raddr))) {
480 if (!(addr = avahi_new(AvahiInterfaceAddress, 1)))
484 addr->address = raddr;
486 addr->entry_group = NULL;
488 AVAHI_LLIST_PREPEND(AvahiInterfaceAddress, address, i->addresses, addr);
491 addr->flags = ifaddrmsg->ifa_flags;
492 addr->scope = ifaddrmsg->ifa_scope;
493 addr->prefix_len = ifaddrmsg->ifa_prefixlen;
495 update_address_rr(m, addr, 0);
497 AvahiInterfaceAddress *addr;
499 if (!(addr = get_address(m, i, &raddr)))
502 update_address_rr(m, addr, 1);
503 free_address(m, addr);
506 check_interface_relevant(m, i);
508 } else if (n->nlmsg_type == NLMSG_DONE) {
510 if (m->list == LIST_IFACE) {
513 if (netlink_list_items(m->netlink, RTM_GETADDR, &m->query_addr_seq) < 0)
514 avahi_log_warn("NETLINK: Failed to list addrs: %s", strerror(errno));
519 avahi_log_debug("Network interface enumeration completed");
522 } else if (n->nlmsg_type == NLMSG_ERROR && (n->nlmsg_seq == m->query_link_seq || n->nlmsg_seq == m->query_addr_seq)) {
523 struct nlmsgerr *e = NLMSG_DATA (n);
526 avahi_log_warn("NETLINK: Failed to browse: %s", strerror(-e->error));
530 AvahiInterfaceMonitor *avahi_interface_monitor_new(AvahiServer *s) {
531 AvahiInterfaceMonitor *m = NULL;
533 if (!(m = avahi_new0(AvahiInterfaceMonitor, 1)))
534 return NULL; /* OOM */
537 if (!(m->netlink = avahi_netlink_new(s->poll_api, RTMGRP_LINK|RTMGRP_IPV4_IFADDR|RTMGRP_IPV6_IFADDR, netlink_callback, m)))
540 m->hashmap = avahi_hashmap_new(avahi_int_hash, avahi_int_equal, NULL, NULL);
542 AVAHI_LLIST_HEAD_INIT(AvahiInterface, m->interfaces);
543 AVAHI_LLIST_HEAD_INIT(AvahiHwInterface, m->hw_interfaces);
545 if (netlink_list_items(m->netlink, RTM_GETLINK, &m->query_link_seq) < 0)
548 m->list = LIST_IFACE;
553 avahi_interface_monitor_free(m);
557 void avahi_interface_monitor_sync(AvahiInterfaceMonitor *m) {
560 while (m->list != LIST_DONE) {
561 if (!avahi_netlink_work(m->netlink, 1))
566 void avahi_interface_monitor_free(AvahiInterfaceMonitor *m) {
569 while (m->hw_interfaces)
570 free_hw_interface(m, m->hw_interfaces, 1);
572 assert(!m->interfaces);
576 avahi_netlink_free(m->netlink);
579 avahi_hashmap_free(m->hashmap);
585 AvahiInterface* avahi_interface_monitor_get_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx, AvahiProtocol protocol) {
586 AvahiHwInterface *hw;
591 assert(protocol != AVAHI_PROTO_UNSPEC);
593 if (!(hw = avahi_interface_monitor_get_hw_interface(m, idx)))
596 for (i = hw->interfaces; i; i = i->by_hardware_next)
597 if (i->protocol == protocol)
603 AvahiHwInterface* avahi_interface_monitor_get_hw_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx) {
607 return avahi_hashmap_lookup(m->hashmap, &idx);
610 void avahi_interface_send_packet_unicast(AvahiInterface *i, AvahiDnsPacket *p, const AvahiAddress *a, uint16_t port) {
615 if (!avahi_interface_relevant(i))
618 assert(!a || a->family == i->protocol);
621 /* avahi_log_debug("unicast sending on '%s.%i' to %s:%u", i->hardware->name, i->protocol, avahi_address_snprint(t, sizeof(t), a), port); */
623 /* avahi_log_debug("multicast sending on '%s.%i'", i->hardware->name, i->protocol); */
625 if (i->protocol == AVAHI_PROTO_INET && i->monitor->server->fd_ipv4 >= 0)
626 avahi_send_dns_packet_ipv4(i->monitor->server->fd_ipv4, i->hardware->index, p, a ? &a->data.ipv4 : NULL, port);
627 else if (i->protocol == AVAHI_PROTO_INET6 && i->monitor->server->fd_ipv6 >= 0)
628 avahi_send_dns_packet_ipv6(i->monitor->server->fd_ipv6, i->hardware->index, p, a ? &a->data.ipv6 : NULL, port);
631 void avahi_interface_send_packet(AvahiInterface *i, AvahiDnsPacket *p) {
635 avahi_interface_send_packet_unicast(i, p, NULL, 0);
638 int avahi_interface_post_query(AvahiInterface *i, AvahiKey *key, int immediately) {
642 if (avahi_interface_relevant(i))
643 return avahi_query_scheduler_post(i->query_scheduler, key, immediately);
648 int avahi_interface_post_response(AvahiInterface *i, AvahiRecord *record, int flush_cache, const AvahiAddress *querier, int immediately) {
652 if (avahi_interface_relevant(i))
653 return avahi_response_scheduler_post(i->response_scheduler, record, flush_cache, querier, immediately);
658 int avahi_interface_post_probe(AvahiInterface *i, AvahiRecord *record, int immediately) {
662 if (avahi_interface_relevant(i))
663 return avahi_probe_scheduler_post(i->probe_scheduler, record, immediately);
668 int avahi_dump_caches(AvahiInterfaceMonitor *m, AvahiDumpCallback callback, void* userdata) {
672 for (i = m->interfaces; i; i = i->interface_next) {
673 if (avahi_interface_relevant(i)) {
675 snprintf(ln, sizeof(ln), ";;; INTERFACE %s.%i ;;;", i->hardware->name, i->protocol);
676 callback(ln, userdata);
677 if (avahi_cache_dump(i->cache, callback, userdata) < 0)
685 int avahi_interface_relevant(AvahiInterface *i) {
686 AvahiInterfaceAddress *a;
687 int relevant_address;
691 relevant_address = 0;
693 for (a = i->addresses; a; a = a->address_next)
694 if (avahi_interface_address_relevant(a)) {
695 relevant_address = 1;
699 /* avahi_log_debug("%p. iface-relevant: %i %i %i %i %i %i", i, relevant_address, */
700 /* (i->hardware->flags & IFF_UP), */
701 /* (i->hardware->flags & IFF_RUNNING), */
702 /* !(i->hardware->flags & IFF_LOOPBACK), */
703 /* (i->hardware->flags & IFF_MULTICAST), */
704 /* !(i->hardware->flags & IFF_POINTOPOINT)); */
707 (i->hardware->flags & IFF_UP) &&
708 (!i->monitor->server->config.use_iff_running || (i->hardware->flags & IFF_RUNNING)) &&
709 !(i->hardware->flags & IFF_LOOPBACK) &&
710 (i->hardware->flags & IFF_MULTICAST) &&
711 !(i->hardware->flags & IFF_POINTOPOINT) &&
715 int avahi_interface_address_relevant(AvahiInterfaceAddress *a) {
718 return a->scope == RT_SCOPE_UNIVERSE;
722 int avahi_interface_match(AvahiInterface *i, AvahiIfIndex idx, AvahiProtocol protocol) {
725 if (idx > 0 && idx != i->hardware->index)
728 if (protocol != AVAHI_PROTO_UNSPEC && protocol != i->protocol)
734 void avahi_interface_monitor_walk(AvahiInterfaceMonitor *m, AvahiIfIndex interface, AvahiProtocol protocol, AvahiInterfaceMonitorWalkCallback callback, void* userdata) {
739 if (protocol != AVAHI_PROTO_UNSPEC) {
742 if ((i = avahi_interface_monitor_get_interface(m, interface, protocol)))
743 callback(m, i, userdata);
746 AvahiHwInterface *hw;
749 if ((hw = avahi_interface_monitor_get_hw_interface(m, interface)))
750 for (i = hw->interfaces; i; i = i->by_hardware_next)
751 if (avahi_interface_match(i, interface, protocol))
752 callback(m, i, userdata);
758 for (i = m->interfaces; i; i = i->interface_next)
759 if (avahi_interface_match(i, interface, protocol))
760 callback(m, i, userdata);
764 void avahi_update_host_rrs(AvahiInterfaceMonitor *m, int remove_rrs) {
765 AvahiHwInterface *hw;
769 for (hw = m->hw_interfaces; hw; hw = hw->hardware_next)
770 update_hw_interface_rr(m, hw, remove_rrs);
773 int avahi_address_is_local(AvahiInterfaceMonitor *m, const AvahiAddress *a) {
775 AvahiInterfaceAddress *ia;
779 for (i = m->interfaces; i; i = i->interface_next)
780 for (ia = i->addresses; ia; ia = ia->address_next)
781 if (avahi_address_cmp(a, &ia->address) == 0)
787 int avahi_interface_address_on_link(AvahiInterface *i, const AvahiAddress *a) {
788 AvahiInterfaceAddress *ia;
793 if (a->family != i->protocol)
796 for (ia = i->addresses; ia; ia = ia->address_next) {
798 if (a->family == AVAHI_PROTO_INET) {
801 m = ~(((uint32_t) -1) >> ia->prefix_len);
803 if ((ntohl(a->data.ipv4.address) & m) == (ntohl(ia->address.data.ipv4.address) & m))
808 assert(a->family == AVAHI_PROTO_INET6);
812 for (j = 0; j < 16; j++) {
826 if ((a->data.ipv6.address[j] & m) != (ia->address.data.ipv6.address[j] & m))
835 int avahi_interface_has_address(AvahiInterfaceMonitor *m, AvahiIfIndex iface, const AvahiAddress *a) {
837 AvahiInterfaceAddress *j;
840 assert(iface != AVAHI_IF_UNSPEC);
843 if (!(i = avahi_interface_monitor_get_interface(m, iface, a->family)))
846 for (j = i->addresses; j; j = j->address_next)
847 if (avahi_address_cmp(a, &j->address) == 0)