iface.c revision e4583f74180a1a334ce2591316a6a63d74aafd97 
1/* $Id$ */
2
3/***
4  This file is part of avahi.
5
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.
10
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.
15
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
19  USA.
20***/
21
22#ifdef HAVE_CONFIG_H
23#include <config.h>
24#endif
25
26#include <string.h>
27#include <sys/socket.h>
28#include <asm/types.h>
29#include <linux/netlink.h>
30#include <linux/rtnetlink.h>
31#include <errno.h>
32#include <net/if.h>
33#include <stdio.h>
34
35#include <avahi-common/error.h>
36#include <avahi-common/malloc.h>
37
38#include "iface.h"
39#include "netlink.h"
40#include "dns.h"
41#include "socket.h"
42#include "announce.h"
43#include "util.h"
44#include "log.h"
45
46static void update_address_rr(AvahiInterfaceMonitor *m, AvahiInterfaceAddress *a, int remove_rrs) {
47    assert(m);
48    assert(a);
49
50    if (a->interface->announcing &&
51        m->list == LIST_DONE &&
52        avahi_interface_address_relevant(a) &&
53        !remove_rrs &&
54        m->server->config.publish_addresses &&
55        (m->server->state == AVAHI_SERVER_RUNNING ||
56        m->server->state == AVAHI_SERVER_REGISTERING)) {
57
58        /* Fill the entry group */
59        if (!a->entry_group)
60            a->entry_group = avahi_s_entry_group_new(m->server, avahi_host_rr_entry_group_callback, NULL);
61
62        if (!a->entry_group) /* OOM */
63            return;
64
65        if (avahi_s_entry_group_is_empty(a->entry_group)) {
66            char t[64];
67            avahi_address_snprint(t, sizeof(t), &a->address);
68
69            avahi_log_info("Registering new address %s on %s.", t, a->interface->hardware->name);
70
71            if (avahi_server_add_address(m->server, a->entry_group, a->interface->hardware->index, a->interface->protocol, 0, NULL, &a->address) < 0) {
72                avahi_log_warn(__FILE__": avahi_server_add_address() failed: %s", avahi_strerror(m->server->error));
73                avahi_s_entry_group_free(a->entry_group);
74                a->entry_group = NULL;
75                return;
76            }
77
78            avahi_s_entry_group_commit(a->entry_group);
79        }
80    } else {
81
82        /* Clear the entry group */
83
84        if (a->entry_group && !avahi_s_entry_group_is_empty(a->entry_group)) {
85            char t[64];
86            avahi_address_snprint(t, sizeof(t), &a->address);
87
88            if (avahi_s_entry_group_get_state(a->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING)
89                avahi_server_decrease_host_rr_pending(m->server);
90
91            avahi_log_info("Withdrawing address %s on %s.", t, a->interface->hardware->name);
92
93            avahi_s_entry_group_reset(a->entry_group);
94        }
95    }
96}
97
98static void update_interface_rr(AvahiInterfaceMonitor *m, AvahiInterface *i, int remove_rrs) {
99    AvahiInterfaceAddress *a;
100
101    assert(m);
102    assert(i);
103
104    for (a = i->addresses; a; a = a->address_next)
105        update_address_rr(m, a, remove_rrs);
106}
107
108static void update_hw_interface_rr(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, int remove_rrs) {
109    AvahiInterface *i;
110
111    assert(m);
112    assert(hw);
113
114    for (i = hw->interfaces; i; i = i->by_hardware_next)
115        update_interface_rr(m, i, remove_rrs);
116
117    if (m->list == LIST_DONE &&
118        !remove_rrs &&
119        m->server->config.publish_workstation &&
120        (m->server->state == AVAHI_SERVER_RUNNING ||
121        m->server->state == AVAHI_SERVER_REGISTERING)) {
122
123        if (!hw->entry_group)
124            hw->entry_group = avahi_s_entry_group_new(m->server, avahi_host_rr_entry_group_callback, NULL);
125
126        if (!hw->entry_group)
127            return; /* OOM */
128
129        if (avahi_s_entry_group_is_empty(hw->entry_group)) {
130            char *name;
131            char *t;
132
133            if (!(t = avahi_format_mac_address(hw->mac_address, hw->mac_address_size)))
134                return; /* OOM */
135
136            name = avahi_strdup_printf("%s [%s]", m->server->host_name, t);
137            avahi_free(t);
138
139            if (!name)
140                return; /* OOM */
141
142            if (avahi_server_add_service(m->server, hw->entry_group, hw->index, AVAHI_PROTO_UNSPEC, name, "_workstation._tcp", NULL, NULL, 9, NULL) < 0) {
143                avahi_log_warn(__FILE__": avahi_server_add_service() failed.");
144                avahi_s_entry_group_free(hw->entry_group);
145                hw->entry_group = NULL;
146            } else
147                avahi_s_entry_group_commit(hw->entry_group);
148
149            avahi_free(name);
150        }
151
152    } else {
153
154        if (hw->entry_group && !avahi_s_entry_group_is_empty(hw->entry_group)) {
155
156            if (avahi_s_entry_group_get_state(hw->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING)
157                avahi_server_decrease_host_rr_pending(m->server);
158
159            avahi_s_entry_group_reset(hw->entry_group);
160        }
161    }
162}
163
164static void free_address(AvahiInterfaceMonitor *m, AvahiInterfaceAddress *a) {
165    assert(m);
166    assert(a);
167    assert(a->interface);
168
169    update_address_rr(m, a, 1);
170    AVAHI_LLIST_REMOVE(AvahiInterfaceAddress, address, a->interface->addresses, a);
171
172    if (a->entry_group)
173        avahi_s_entry_group_free(a->entry_group);
174
175    avahi_free(a);
176}
177
178static void free_interface(AvahiInterfaceMonitor *m, AvahiInterface *i, int send_goodbye) {
179    assert(m);
180    assert(i);
181
182    avahi_goodbye_interface(m->server, i, send_goodbye);
183    avahi_response_scheduler_force(i->response_scheduler);
184
185    assert(!i->announcements);
186
187    update_interface_rr(m, i, 1);
188
189    while (i->addresses)
190        free_address(m, i->addresses);
191
192    avahi_response_scheduler_free(i->response_scheduler);
193    avahi_query_scheduler_free(i->query_scheduler);
194    avahi_probe_scheduler_free(i->probe_scheduler);
195    avahi_cache_free(i->cache);
196
197    AVAHI_LLIST_REMOVE(AvahiInterface, interface, m->interfaces, i);
198    AVAHI_LLIST_REMOVE(AvahiInterface, by_hardware, i->hardware->interfaces, i);
199
200    avahi_free(i);
201}
202
203static void free_hw_interface(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, int send_goodbye) {
204    assert(m);
205    assert(hw);
206
207    update_hw_interface_rr(m, hw, 1);
208
209    while (hw->interfaces)
210        free_interface(m, hw->interfaces, send_goodbye);
211
212    if (hw->entry_group)
213        avahi_s_entry_group_free(hw->entry_group);
214
215    AVAHI_LLIST_REMOVE(AvahiHwInterface, hardware, m->hw_interfaces, hw);
216    avahi_hashmap_remove(m->hashmap, &hw->index);
217
218    avahi_free(hw->name);
219    avahi_free(hw);
220}
221
222static AvahiInterfaceAddress* get_address(AvahiInterfaceMonitor *m, AvahiInterface *i, const AvahiAddress *raddr) {
223    AvahiInterfaceAddress *ia;
224
225    assert(m);
226    assert(i);
227    assert(raddr);
228
229    for (ia = i->addresses; ia; ia = ia->address_next)
230        if (avahi_address_cmp(&ia->address, raddr) == 0)
231            return ia;
232
233    return NULL;
234}
235
236static int netlink_list_items(AvahiNetlink *nl, uint16_t type, unsigned *ret_seq) {
237    struct nlmsghdr *n;
238    struct rtgenmsg *gen;
239    uint8_t req[1024];
240
241    memset(&req, 0, sizeof(req));
242    n = (struct nlmsghdr*) req;
243    n->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg));
244    n->nlmsg_type = type;
245    n->nlmsg_flags = NLM_F_ROOT/*|NLM_F_MATCH*/|NLM_F_REQUEST;
246    n->nlmsg_pid = 0;
247
248    gen = NLMSG_DATA(n);
249    memset(gen, 0, sizeof(struct rtgenmsg));
250    gen->rtgen_family = AF_UNSPEC;
251
252    return avahi_netlink_send(nl, n, ret_seq);
253}
254
255static void new_interface(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, AvahiProtocol protocol) {
256    AvahiInterface *i;
257
258    assert(m);
259    assert(hw);
260    assert(protocol != AVAHI_PROTO_UNSPEC);
261
262    if (!(i = avahi_new(AvahiInterface, 1)))
263        goto fail; /* OOM */
264
265    i->monitor = m;
266    i->hardware = hw;
267    i->protocol = protocol;
268    i->announcing = 0;
269
270    AVAHI_LLIST_HEAD_INIT(AvahiInterfaceAddress, i->addresses);
271    AVAHI_LLIST_HEAD_INIT(AvahiAnnouncement, i->announcements);
272
273    i->cache = avahi_cache_new(m->server, i);
274    i->response_scheduler = avahi_response_scheduler_new(i);
275    i->query_scheduler = avahi_query_scheduler_new(i);
276    i->probe_scheduler = avahi_probe_scheduler_new(i);
277
278    if (!i->cache || !i->response_scheduler || !i->query_scheduler || !i->probe_scheduler)
279        goto fail; /* OOM */
280
281    AVAHI_LLIST_PREPEND(AvahiInterface, by_hardware, hw->interfaces, i);
282    AVAHI_LLIST_PREPEND(AvahiInterface, interface, m->interfaces, i);
283
284    return;
285fail:
286
287    if (i) {
288        if (i->cache)
289            avahi_cache_free(i->cache);
290        if (i->response_scheduler)
291            avahi_response_scheduler_free(i->response_scheduler);
292        if (i->query_scheduler)
293            avahi_query_scheduler_free(i->query_scheduler);
294        if (i->probe_scheduler)
295            avahi_probe_scheduler_free(i->probe_scheduler);
296    }
297
298}
299
300static void check_interface_relevant(AvahiInterfaceMonitor *m, AvahiInterface *i) {
301    int b;
302
303    assert(m);
304    assert(i);
305
306    b = avahi_interface_relevant(i);
307
308    if (m->list == LIST_DONE && b && !i->announcing) {
309        avahi_log_info("New relevant interface %s.%i.", i->hardware->name, i->protocol);
310
311        if (i->protocol == AVAHI_PROTO_INET)
312            avahi_mdns_mcast_join_ipv4(m->server->fd_ipv4, i->hardware->index);
313        if (i->protocol == AVAHI_PROTO_INET6)
314            avahi_mdns_mcast_join_ipv6(m->server->fd_ipv6, i->hardware->index);
315
316        i->announcing = 1;
317        avahi_announce_interface(m->server, i);
318        avahi_browser_new_interface(m->server, i);
319    } else if (!b && i->announcing) {
320        avahi_log_info("Interface %s.%i no longer relevant.", i->hardware->name, i->protocol);
321
322        if (i->protocol == AVAHI_PROTO_INET)
323            avahi_mdns_mcast_leave_ipv4(m->server->fd_ipv4, i->hardware->index);
324        if (i->protocol == AVAHI_PROTO_INET6)
325            avahi_mdns_mcast_leave_ipv6(m->server->fd_ipv6, i->hardware->index);
326
327        avahi_goodbye_interface(m->server, i, 0);
328        avahi_response_scheduler_clear(i->response_scheduler);
329        avahi_query_scheduler_clear(i->query_scheduler);
330        avahi_probe_scheduler_clear(i->probe_scheduler);
331        avahi_cache_flush(i->cache);
332
333        i->announcing = 0;
334    }
335}
336
337static void check_hw_interface_relevant(AvahiInterfaceMonitor *m, AvahiHwInterface *hw) {
338    AvahiInterface *i;
339
340    assert(m);
341    assert(hw);
342
343    for (i = hw->interfaces; i; i = i->by_hardware_next)
344        check_interface_relevant(m, i);
345}
346
347static void check_all_interfaces_relevant(AvahiInterfaceMonitor *m) {
348    AvahiInterface *i;
349    assert(m);
350
351    for (i = m->interfaces; i; i = i->interface_next)
352        check_interface_relevant(m, i);
353}
354
355static void netlink_callback(AvahiNetlink *nl, struct nlmsghdr *n, void* userdata) {
356    AvahiInterfaceMonitor *m = userdata;
357
358    assert(m);
359    assert(n);
360    assert(m->netlink == nl);
361
362    if (n->nlmsg_type == RTM_NEWLINK) {
363        struct ifinfomsg *ifinfomsg = NLMSG_DATA(n);
364        AvahiHwInterface *hw;
365        struct rtattr *a = NULL;
366        size_t l;
367
368        if (ifinfomsg->ifi_family != AF_UNSPEC)
369            return;
370
371        if (!(hw = avahi_hashmap_lookup(m->hashmap, &ifinfomsg->ifi_index))) {
372
373            if (!(hw = avahi_new(AvahiHwInterface, 1)))
374                return; /* OOM */
375
376            hw->monitor = m;
377            hw->name = NULL;
378            hw->flags = 0;
379            hw->mtu = 1500;
380            hw->index = (AvahiIfIndex) ifinfomsg->ifi_index;
381            hw->mac_address_size = 0;
382            hw->entry_group = NULL;
383
384            AVAHI_LLIST_HEAD_INIT(AvahiInterface, hw->interfaces);
385            AVAHI_LLIST_PREPEND(AvahiHwInterface, hardware, m->hw_interfaces, hw);
386
387            avahi_hashmap_insert(m->hashmap, &hw->index, hw);
388
389            if (m->server->fd_ipv4 >= 0)
390                new_interface(m, hw, AVAHI_PROTO_INET);
391            if (m->server->fd_ipv6 >= 0)
392                new_interface(m, hw, AVAHI_PROTO_INET6);
393        }
394
395        hw->flags = ifinfomsg->ifi_flags;
396
397        l = NLMSG_PAYLOAD(n, sizeof(struct ifinfomsg));
398        a = IFLA_RTA(ifinfomsg);
399
400        while (RTA_OK(a, l)) {
401            switch(a->rta_type) {
402                case IFLA_IFNAME:
403                    avahi_free(hw->name);
404                    hw->name = avahi_strndup(RTA_DATA(a), RTA_PAYLOAD(a));
405                    break;
406
407                case IFLA_MTU:
408                    assert(RTA_PAYLOAD(a) == sizeof(unsigned int));
409                    hw->mtu = *((unsigned int*) RTA_DATA(a));
410                    break;
411
412                case IFLA_ADDRESS: {
413                    hw->mac_address_size = RTA_PAYLOAD(a);
414                    if (hw->mac_address_size > AVAHI_MAX_MAC_ADDRESS)
415                        hw->mac_address_size = AVAHI_MAX_MAC_ADDRESS;
416
417                    memcpy(hw->mac_address, RTA_DATA(a), hw->mac_address_size);
418                    break;
419                }
420
421                default:
422                    ;
423            }
424
425            a = RTA_NEXT(a, l);
426        }
427
428        check_hw_interface_relevant(m, hw);
429        update_hw_interface_rr(m, hw, 0);
430
431    } else if (n->nlmsg_type == RTM_DELLINK) {
432        struct ifinfomsg *ifinfomsg = NLMSG_DATA(n);
433        AvahiHwInterface *hw;
434
435        if (ifinfomsg->ifi_family != AF_UNSPEC)
436            return;
437
438        if (!(hw = avahi_interface_monitor_get_hw_interface(m, (AvahiIfIndex) ifinfomsg->ifi_index)))
439            return;
440
441        free_hw_interface(m, hw, 0);
442
443    } else if (n->nlmsg_type == RTM_NEWADDR || n->nlmsg_type == RTM_DELADDR) {
444
445        struct ifaddrmsg *ifaddrmsg = NLMSG_DATA(n);
446        AvahiInterface *i;
447        struct rtattr *a = NULL;
448        size_t l;
449        AvahiAddress raddr;
450        int raddr_valid = 0;
451
452        if (ifaddrmsg->ifa_family != AVAHI_PROTO_INET && ifaddrmsg->ifa_family != AVAHI_PROTO_INET6)
453            return;
454
455        if (!(i = (AvahiInterface*) avahi_interface_monitor_get_interface(m, (AvahiIfIndex) ifaddrmsg->ifa_index, (AvahiProtocol) ifaddrmsg->ifa_family)))
456            return;
457
458        raddr.family = (AvahiProtocol) ifaddrmsg->ifa_family;
459
460        l = NLMSG_PAYLOAD(n, sizeof(struct ifaddrmsg));
461        a = IFA_RTA(ifaddrmsg);
462
463        while (RTA_OK(a, l)) {
464
465            switch(a->rta_type) {
466                case IFA_ADDRESS:
467                    if ((raddr.family == AVAHI_PROTO_INET6 && RTA_PAYLOAD(a) != 16) ||
468                        (raddr.family == AVAHI_PROTO_INET && RTA_PAYLOAD(a) != 4))
469                        return;
470
471                    memcpy(raddr.data.data, RTA_DATA(a), RTA_PAYLOAD(a));
472                    raddr_valid = 1;
473
474                    break;
475
476                default:
477                    ;
478            }
479
480            a = RTA_NEXT(a, l);
481        }
482
483        if (!raddr_valid)
484            return;
485
486        if (n->nlmsg_type == RTM_NEWADDR) {
487            AvahiInterfaceAddress *addr;
488
489            if (!(addr = get_address(m, i, &raddr))) {
490                if (!(addr = avahi_new(AvahiInterfaceAddress, 1)))
491                    return; /* OOM */
492
493                addr->monitor = m;
494                addr->address = raddr;
495                addr->interface = i;
496                addr->entry_group = NULL;
497
498                AVAHI_LLIST_PREPEND(AvahiInterfaceAddress, address, i->addresses, addr);
499            }
500
501            addr->flags = ifaddrmsg->ifa_flags;
502            addr->scope = ifaddrmsg->ifa_scope;
503            addr->prefix_len = ifaddrmsg->ifa_prefixlen;
504        } else {
505            AvahiInterfaceAddress *addr;
506
507            if (!(addr = get_address(m, i, &raddr)))
508                return;
509
510            free_address(m, addr);
511        }
512
513        check_interface_relevant(m, i);
514        update_interface_rr(m, i, 0);
515
516    } else if (n->nlmsg_type == NLMSG_DONE) {
517
518        if (m->list == LIST_IFACE) {
519
520            if (netlink_list_items(m->netlink, RTM_GETADDR, &m->query_addr_seq) < 0) {
521                avahi_log_warn("NETLINK: Failed to list addrs: %s", strerror(errno));
522                m->list = LIST_DONE;
523            } else
524                m->list = LIST_ADDR;
525
526        } else
527            /* We're through */
528            m->list = LIST_DONE;
529
530        if (m->list == LIST_DONE) {
531            check_all_interfaces_relevant(m);
532            avahi_update_host_rrs(m, 0);
533            avahi_log_info("Network interface enumeration completed.");
534        }
535
536    } else if (n->nlmsg_type == NLMSG_ERROR && (n->nlmsg_seq == m->query_link_seq || n->nlmsg_seq == m->query_addr_seq)) {
537        struct nlmsgerr *e = NLMSG_DATA (n);
538
539        if (e->error)
540            avahi_log_warn("NETLINK: Failed to browse: %s", strerror(-e->error));
541    }
542}
543
544AvahiInterfaceMonitor *avahi_interface_monitor_new(AvahiServer *s) {
545    AvahiInterfaceMonitor *m = NULL;
546
547    if (!(m = avahi_new0(AvahiInterfaceMonitor, 1)))
548        return NULL; /* OOM */
549
550    m->server = s;
551    if (!(m->netlink = avahi_netlink_new(s->poll_api, RTMGRP_LINK|RTMGRP_IPV4_IFADDR|RTMGRP_IPV6_IFADDR, netlink_callback, m)))
552        goto fail;
553
554    m->hashmap = avahi_hashmap_new(avahi_int_hash, avahi_int_equal, NULL, NULL);
555
556    AVAHI_LLIST_HEAD_INIT(AvahiInterface, m->interfaces);
557    AVAHI_LLIST_HEAD_INIT(AvahiHwInterface, m->hw_interfaces);
558
559    if (netlink_list_items(m->netlink, RTM_GETLINK, &m->query_link_seq) < 0)
560        goto fail;
561
562    m->list = LIST_IFACE;
563
564    return m;
565
566fail:
567    avahi_interface_monitor_free(m);
568    return NULL;
569}
570
571void avahi_interface_monitor_sync(AvahiInterfaceMonitor *m) {
572    assert(m);
573
574    while (m->list != LIST_DONE) {
575        if (!avahi_netlink_work(m->netlink, 1))
576            break;
577    }
578}
579
580void avahi_interface_monitor_free(AvahiInterfaceMonitor *m) {
581    assert(m);
582
583    while (m->hw_interfaces)
584        free_hw_interface(m, m->hw_interfaces, 1);
585
586    assert(!m->interfaces);
587
588
589    if (m->netlink)
590        avahi_netlink_free(m->netlink);
591
592    if (m->hashmap)
593        avahi_hashmap_free(m->hashmap);
594
595    avahi_free(m);
596}
597
598
599AvahiInterface* avahi_interface_monitor_get_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx, AvahiProtocol protocol) {
600    AvahiHwInterface *hw;
601    AvahiInterface *i;
602
603    assert(m);
604    assert(idx > 0);
605    assert(protocol != AVAHI_PROTO_UNSPEC);
606
607    if (!(hw = avahi_interface_monitor_get_hw_interface(m, idx)))
608        return NULL;
609
610    for (i = hw->interfaces; i; i = i->by_hardware_next)
611        if (i->protocol == protocol)
612            return i;
613
614    return NULL;
615}
616
617AvahiHwInterface* avahi_interface_monitor_get_hw_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx) {
618    assert(m);
619    assert(idx > 0);
620
621    return avahi_hashmap_lookup(m->hashmap, &idx);
622}
623
624void avahi_interface_send_packet_unicast(AvahiInterface *i, AvahiDnsPacket *p, const AvahiAddress *a, uint16_t port) {
625    assert(i);
626    assert(p);
627/*     char t[64]; */
628
629    if (!avahi_interface_relevant(i))
630        return;
631
632    assert(!a || a->family == i->protocol);
633
634/*     if (a) */
635/*         avahi_log_debug("unicast sending on '%s.%i' to %s:%u", i->hardware->name, i->protocol, avahi_address_snprint(t, sizeof(t), a), port); */
636/*     else */
637/*         avahi_log_debug("multicast sending on '%s.%i'", i->hardware->name, i->protocol); */
638
639    if (i->protocol == AVAHI_PROTO_INET && i->monitor->server->fd_ipv4 >= 0)
640        avahi_send_dns_packet_ipv4(i->monitor->server->fd_ipv4, i->hardware->index, p, a ? &a->data.ipv4 : NULL, port);
641    else if (i->protocol == AVAHI_PROTO_INET6 && i->monitor->server->fd_ipv6 >= 0)
642        avahi_send_dns_packet_ipv6(i->monitor->server->fd_ipv6, i->hardware->index, p, a ? &a->data.ipv6 : NULL, port);
643}
644
645void avahi_interface_send_packet(AvahiInterface *i, AvahiDnsPacket *p) {
646    assert(i);
647    assert(p);
648
649    avahi_interface_send_packet_unicast(i, p, NULL, 0);
650}
651
652int avahi_interface_post_query(AvahiInterface *i, AvahiKey *key, int immediately) {
653    assert(i);
654    assert(key);
655
656    if (avahi_interface_relevant(i))
657        return avahi_query_scheduler_post(i->query_scheduler, key, immediately);
658
659    return 0;
660}
661
662int avahi_interface_post_response(AvahiInterface *i, AvahiRecord *record, int flush_cache, const AvahiAddress *querier, int immediately) {
663    assert(i);
664    assert(record);
665
666    if (avahi_interface_relevant(i))
667        return avahi_response_scheduler_post(i->response_scheduler, record, flush_cache, querier, immediately);
668
669    return 0;
670}
671
672int avahi_interface_post_probe(AvahiInterface *i, AvahiRecord *record, int immediately) {
673    assert(i);
674    assert(record);
675
676    if (avahi_interface_relevant(i))
677        return avahi_probe_scheduler_post(i->probe_scheduler, record, immediately);
678
679    return 0;
680}
681
682int avahi_dump_caches(AvahiInterfaceMonitor *m, AvahiDumpCallback callback, void* userdata) {
683    AvahiInterface *i;
684    assert(m);
685
686    for (i = m->interfaces; i; i = i->interface_next) {
687        if (avahi_interface_relevant(i)) {
688            char ln[256];
689            snprintf(ln, sizeof(ln), ";;; INTERFACE %s.%i ;;;", i->hardware->name, i->protocol);
690            callback(ln, userdata);
691            if (avahi_cache_dump(i->cache, callback, userdata) < 0)
692                return -1;
693        }
694    }
695
696    return 0;
697}
698
699int avahi_interface_relevant(AvahiInterface *i) {
700    AvahiInterfaceAddress *a;
701    int relevant_address;
702
703    assert(i);
704
705    relevant_address = 0;
706
707    for (a = i->addresses; a; a = a->address_next)
708        if (avahi_interface_address_relevant(a)) {
709            relevant_address = 1;
710            break;
711        }
712
713/*     avahi_log_debug("%p. iface-relevant: %i %i %i %i %i %i", i, relevant_address, */
714/*               (i->hardware->flags & IFF_UP), */
715/*               (i->hardware->flags & IFF_RUNNING), */
716/*               !(i->hardware->flags & IFF_LOOPBACK), */
717/*               (i->hardware->flags & IFF_MULTICAST), */
718/*               !(i->hardware->flags & IFF_POINTOPOINT)); */
719
720    return
721        (i->hardware->flags & IFF_UP) &&
722        (!i->monitor->server->config.use_iff_running || (i->hardware->flags & IFF_RUNNING)) &&
723        !(i->hardware->flags & IFF_LOOPBACK) &&
724        (i->hardware->flags & IFF_MULTICAST) &&
725        !(i->hardware->flags & IFF_POINTOPOINT) &&
726        relevant_address;
727}
728
729int avahi_interface_address_relevant(AvahiInterfaceAddress *a) {
730    AvahiInterfaceAddress *b;
731    assert(a);
732
733    /* Publish public IP addresses */
734    if (a->scope == RT_SCOPE_UNIVERSE ||
735        a->scope == RT_SCOPE_SITE)
736        return 1;
737
738    if (a->scope == RT_SCOPE_LINK) {
739
740        /* Publish link local IP addresses if they are the only ones on the link */
741        for (b = a->interface->addresses; b; b = b->address_next) {
742            if (b == a)
743                continue;
744
745            if (b->scope == RT_SCOPE_UNIVERSE ||
746                b->scope == RT_SCOPE_SITE)
747                return 0;
748        }
749
750        return 1;
751    }
752
753    return 0;
754}
755
756int avahi_interface_match(AvahiInterface *i, AvahiIfIndex idx, AvahiProtocol protocol) {
757    assert(i);
758
759    if (idx > 0 && idx != i->hardware->index)
760        return 0;
761
762    if (protocol != AVAHI_PROTO_UNSPEC && protocol != i->protocol)
763        return 0;
764
765    return 1;
766}
767
768void avahi_interface_monitor_walk(AvahiInterfaceMonitor *m, AvahiIfIndex interface, AvahiProtocol protocol, AvahiInterfaceMonitorWalkCallback callback, void* userdata) {
769    assert(m);
770    assert(callback);
771
772    if (interface > 0) {
773        if (protocol != AVAHI_PROTO_UNSPEC) {
774            AvahiInterface *i;
775
776            if ((i = avahi_interface_monitor_get_interface(m, interface, protocol)))
777                callback(m, i, userdata);
778
779        } else {
780            AvahiHwInterface *hw;
781            AvahiInterface *i;
782
783            if ((hw = avahi_interface_monitor_get_hw_interface(m, interface)))
784                for (i = hw->interfaces; i; i = i->by_hardware_next)
785                    if (avahi_interface_match(i, interface, protocol))
786                        callback(m, i, userdata);
787        }
788
789    } else {
790        AvahiInterface *i;
791
792        for (i = m->interfaces; i; i = i->interface_next)
793            if (avahi_interface_match(i, interface, protocol))
794                callback(m, i, userdata);
795    }
796}
797
798void avahi_update_host_rrs(AvahiInterfaceMonitor *m, int remove_rrs) {
799    AvahiHwInterface *hw;
800
801    assert(m);
802
803    for (hw = m->hw_interfaces; hw; hw = hw->hardware_next)
804        update_hw_interface_rr(m, hw, remove_rrs);
805}
806
807int avahi_address_is_local(AvahiInterfaceMonitor *m, const AvahiAddress *a) {
808    AvahiInterface *i;
809    AvahiInterfaceAddress *ia;
810    assert(m);
811    assert(a);
812
813    for (i = m->interfaces; i; i = i->interface_next)
814        for (ia = i->addresses; ia; ia = ia->address_next)
815            if (avahi_address_cmp(a, &ia->address) == 0)
816                return 1;
817
818    return 0;
819}
820
821int avahi_interface_address_on_link(AvahiInterface *i, const AvahiAddress *a) {
822    AvahiInterfaceAddress *ia;
823
824    assert(i);
825    assert(a);
826
827    if (a->family != i->protocol)
828        return 0;
829
830    for (ia = i->addresses; ia; ia = ia->address_next) {
831
832        if (a->family == AVAHI_PROTO_INET) {
833            uint32_t m;
834
835            m = ~(((uint32_t) -1) >> ia->prefix_len);
836
837            if ((ntohl(a->data.ipv4.address) & m) == (ntohl(ia->address.data.ipv4.address) & m))
838                return 1;
839        } else {
840            unsigned j;
841            unsigned char pl;
842            assert(a->family == AVAHI_PROTO_INET6);
843
844            pl = ia->prefix_len;
845
846            for (j = 0; j < 16; j++) {
847                uint8_t m;
848
849                if (pl == 0)
850                    return 1;
851
852                if (pl >= 8) {
853                    m = 0xFF;
854                    pl -= 8;
855                } else {
856                    m = ~(0xFF >> pl);
857                    pl = 0;
858                }
859
860                if ((a->data.ipv6.address[j] & m) != (ia->address.data.ipv6.address[j] & m))
861                    break;
862            }
863        }
864    }
865
866    return 0;
867}
868
869int avahi_interface_has_address(AvahiInterfaceMonitor *m, AvahiIfIndex iface, const AvahiAddress *a) {
870    AvahiInterface *i;
871    AvahiInterfaceAddress *j;
872
873    assert(m);
874    assert(iface != AVAHI_IF_UNSPEC);
875    assert(a);
876
877    if (!(i = avahi_interface_monitor_get_interface(m, iface, a->family)))
878        return 0;
879
880    for (j = i->addresses; j; j = j->address_next)
881        if (avahi_address_cmp(a, &j->address) == 0)
882            return 1;
883
884    return 0;
885}
886