git.meshlink.io Git - catta/blob - avahi-core/iface.c

   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 <errno.h>
  29 #include <stdio.h>
  30
  31 #include <avahi-common/error.h>
  32 #include <avahi-common/malloc.h>
  33 #include <avahi-common/domain.h>
  34
  35 #include "iface.h"
  36 #include "dns.h"
  37 #include "socket.h"
  38 #include "announce.h"
  39 #include "util.h"
  40 #include "log.h"
  41 #include "multicast-lookup.h"
  42 #include "querier.h"
  43
  44 void avahi_interface_address_update_rrs(AvahiInterfaceAddress *a, int remove_rrs) {
  45     AvahiInterfaceMonitor *m;
  46
  47     assert(a);
  48     m = a->monitor;
  49
  50     if (a->interface->announcing &&
  51         m->list_complete &&
  52         avahi_interface_address_is_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[AVAHI_ADDRESS_STR_MAX];
  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[AVAHI_ADDRESS_STR_MAX];
  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                 m->server->state == AVAHI_SERVER_REGISTERING)
  90                 avahi_server_decrease_host_rr_pending(m->server);
  91
  92             avahi_log_info("Withdrawing address %s on %s.", t, a->interface->hardware->name);
  93
  94             avahi_s_entry_group_reset(a->entry_group);
  95         }
  96     }
  97 }
  98
  99 void avahi_interface_update_rrs(AvahiInterface *i, int remove_rrs) {
 100     AvahiInterfaceAddress *a;
 101
 102     assert(i);
 103
 104     for (a = i->addresses; a; a = a->address_next)
 105         avahi_interface_address_update_rrs(a, remove_rrs);
 106 }
 107
 108 void avahi_hw_interface_update_rrs(AvahiHwInterface *hw, int remove_rrs) {
 109     AvahiInterface *i;
 110     AvahiInterfaceMonitor *m;
 111
 112     assert(hw);
 113     m = hw->monitor;
 114
 115     for (i = hw->interfaces; i; i = i->by_hardware_next)
 116         avahi_interface_update_rrs(i, remove_rrs);
 117
 118     if (m->list_complete &&
 119         !remove_rrs &&
 120         m->server->config.publish_workstation &&
 121         (m->server->state == AVAHI_SERVER_RUNNING ||
 122         m->server->state == AVAHI_SERVER_REGISTERING)) {
 123
 124         if (!hw->entry_group)
 125             hw->entry_group = avahi_s_entry_group_new(m->server, avahi_host_rr_entry_group_callback, NULL);
 126
 127         if (!hw->entry_group)
 128             return; /* OOM */
 129
 130         if (avahi_s_entry_group_is_empty(hw->entry_group)) {
 131             char name[AVAHI_LABEL_MAX];
 132             char *t;
 133
 134             if (!(t = avahi_format_mac_address(hw->mac_address, hw->mac_address_size)))
 135                 return; /* OOM */
 136
 137             snprintf(name, sizeof(name), "%s [%s]", m->server->host_name, t);
 138             avahi_free(t);
 139
 140             if (!name)
 141                 return; /* OOM */
 142
 143             if (avahi_server_add_service(m->server, hw->entry_group, hw->index, AVAHI_PROTO_UNSPEC, 0, name, "_workstation._tcp", NULL, NULL, 9, NULL) < 0) {
 144                 avahi_log_warn(__FILE__": avahi_server_add_service() failed: %s", avahi_strerror(m->server->error));
 145                 avahi_s_entry_group_free(hw->entry_group);
 146                 hw->entry_group = NULL;
 147             } else
 148                 avahi_s_entry_group_commit(hw->entry_group);
 149         }
 150
 151     } else {
 152
 153         if (hw->entry_group && !avahi_s_entry_group_is_empty(hw->entry_group)) {
 154
 155             if (avahi_s_entry_group_get_state(hw->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING)
 156                 avahi_server_decrease_host_rr_pending(m->server);
 157
 158             avahi_s_entry_group_reset(hw->entry_group);
 159         }
 160     }
 161 }
 162
 163 void avahi_interface_monitor_update_rrs(AvahiInterfaceMonitor *m, int remove_rrs) {
 164     AvahiHwInterface *hw;
 165
 166     assert(m);
 167
 168     for (hw = m->hw_interfaces; hw; hw = hw->hardware_next)
 169         avahi_hw_interface_update_rrs(hw, remove_rrs);
 170 }
 171
 172 void avahi_interface_address_free(AvahiInterfaceAddress *a) {
 173     assert(a);
 174     assert(a->interface);
 175
 176     avahi_interface_address_update_rrs(a, 1);
 177     AVAHI_LLIST_REMOVE(AvahiInterfaceAddress, address, a->interface->addresses, a);
 178
 179     if (a->entry_group)
 180         avahi_s_entry_group_free(a->entry_group);
 181
 182     avahi_free(a);
 183 }
 184
 185 void avahi_interface_free(AvahiInterface *i, int send_goodbye) {
 186     assert(i);
 187
 188     /* Handle goodbyes and remove announcers */
 189     avahi_goodbye_interface(i->monitor->server, i, send_goodbye, 1);
 190     avahi_response_scheduler_force(i->response_scheduler);
 191     assert(!i->announcers);
 192
 193     /* Remove queriers */
 194     avahi_querier_free_all(i);
 195     avahi_hashmap_free(i->queriers_by_key);
 196
 197     /* Remove local RRs */
 198     avahi_interface_update_rrs(i, 1);
 199
 200     while (i->addresses)
 201         avahi_interface_address_free(i->addresses);
 202
 203     avahi_response_scheduler_free(i->response_scheduler);
 204     avahi_query_scheduler_free(i->query_scheduler);
 205     avahi_probe_scheduler_free(i->probe_scheduler);
 206     avahi_cache_free(i->cache);
 207
 208     AVAHI_LLIST_REMOVE(AvahiInterface, interface, i->monitor->interfaces, i);
 209     AVAHI_LLIST_REMOVE(AvahiInterface, by_hardware, i->hardware->interfaces, i);
 210
 211     avahi_free(i);
 212 }
 213
 214 void avahi_hw_interface_free(AvahiHwInterface *hw, int send_goodbye) {
 215     assert(hw);
 216
 217     avahi_hw_interface_update_rrs(hw, 1);
 218
 219     while (hw->interfaces)
 220         avahi_interface_free(hw->interfaces, send_goodbye);
 221
 222     if (hw->entry_group)
 223         avahi_s_entry_group_free(hw->entry_group);
 224
 225     AVAHI_LLIST_REMOVE(AvahiHwInterface, hardware, hw->monitor->hw_interfaces, hw);
 226     avahi_hashmap_remove(hw->monitor->hashmap, &hw->index);
 227
 228     avahi_free(hw->name);
 229     avahi_free(hw);
 230 }
 231
 232 AvahiInterface* avahi_interface_new(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, AvahiProtocol protocol) {
 233     AvahiInterface *i;
 234
 235     assert(m);
 236     assert(hw);
 237     assert(AVAHI_PROTO_VALID(protocol));
 238
 239     if (!(i = avahi_new(AvahiInterface, 1)))
 240         goto fail; /* OOM */
 241
 242     i->monitor = m;
 243     i->hardware = hw;
 244     i->protocol = protocol;
 245     i->announcing = 0;
 246
 247     AVAHI_LLIST_HEAD_INIT(AvahiInterfaceAddress, i->addresses);
 248     AVAHI_LLIST_HEAD_INIT(AvahiAnnouncer, i->announcers);
 249
 250     AVAHI_LLIST_HEAD_INIT(AvahiQuerier, i->queriers);
 251     i->queriers_by_key = avahi_hashmap_new((AvahiHashFunc) avahi_key_hash, (AvahiEqualFunc) avahi_key_equal, NULL, NULL);
 252
 253     i->cache = avahi_cache_new(m->server, i);
 254     i->response_scheduler = avahi_response_scheduler_new(i);
 255     i->query_scheduler = avahi_query_scheduler_new(i);
 256     i->probe_scheduler = avahi_probe_scheduler_new(i);
 257
 258     if (!i->cache || !i->response_scheduler || !i->query_scheduler || !i->probe_scheduler)
 259         goto fail; /* OOM */
 260
 261     AVAHI_LLIST_PREPEND(AvahiInterface, by_hardware, hw->interfaces, i);
 262     AVAHI_LLIST_PREPEND(AvahiInterface, interface, m->interfaces, i);
 263
 264     return i;
 265
 266 fail:
 267
 268     if (i) {
 269         if (i->cache)
 270             avahi_cache_free(i->cache);
 271         if (i->response_scheduler)
 272             avahi_response_scheduler_free(i->response_scheduler);
 273         if (i->query_scheduler)
 274             avahi_query_scheduler_free(i->query_scheduler);
 275         if (i->probe_scheduler)
 276             avahi_probe_scheduler_free(i->probe_scheduler);
 277     }
 278
 279     return NULL;
 280 }
 281
 282 AvahiHwInterface *avahi_hw_interface_new(AvahiInterfaceMonitor *m, AvahiIfIndex idx) {
 283     AvahiHwInterface *hw;
 284
 285     assert(m);
 286     assert(AVAHI_IF_VALID(idx));
 287
 288     if  (!(hw = avahi_new(AvahiHwInterface, 1)))
 289         return NULL;
 290
 291     hw->monitor = m;
 292     hw->name = NULL;
 293     hw->flags_ok = 0;
 294     hw->mtu = 1500;
 295     hw->index = idx;
 296     hw->mac_address_size = 0;
 297     hw->entry_group = NULL;
 298
 299     AVAHI_LLIST_HEAD_INIT(AvahiInterface, hw->interfaces);
 300     AVAHI_LLIST_PREPEND(AvahiHwInterface, hardware, m->hw_interfaces, hw);
 301
 302     avahi_hashmap_insert(m->hashmap, &hw->index, hw);
 303
 304     if (m->server->fd_ipv4 >= 0)
 305         avahi_interface_new(m, hw, AVAHI_PROTO_INET);
 306     if (m->server->fd_ipv6 >= 0)
 307         avahi_interface_new(m, hw, AVAHI_PROTO_INET6);
 308
 309     return hw;
 310 }
 311
 312 AvahiInterfaceAddress *avahi_interface_address_new(AvahiInterfaceMonitor *m, AvahiInterface *i, const AvahiAddress *addr, unsigned prefix_len) {
 313     AvahiInterfaceAddress *a;
 314
 315     assert(m);
 316     assert(i);
 317
 318     if (!(a = avahi_new(AvahiInterfaceAddress, 1)))
 319         return NULL;
 320
 321     a->interface = i;
 322     a->monitor = m;
 323     a->address = *addr;
 324     a->prefix_len = prefix_len;
 325     a->global_scope = 0;
 326     a->entry_group = NULL;
 327
 328     AVAHI_LLIST_PREPEND(AvahiInterfaceAddress, address, i->addresses, a);
 329
 330     return a;
 331 }
 332
 333 void avahi_interface_check_relevant(AvahiInterface *i) {
 334     int b;
 335     AvahiInterfaceMonitor *m;
 336
 337     assert(i);
 338     m = i->monitor;
 339
 340     b = avahi_interface_is_relevant(i);
 341
 342     if (m->list_complete && b && !i->announcing) {
 343         avahi_log_info("New relevant interface %s.%s.", i->hardware->name, avahi_proto_to_string(i->protocol));
 344
 345         if (i->protocol == AVAHI_PROTO_INET)
 346             avahi_mdns_mcast_join_ipv4(m->server->fd_ipv4, i->hardware->index);
 347         if (i->protocol == AVAHI_PROTO_INET6)
 348             avahi_mdns_mcast_join_ipv6(m->server->fd_ipv6, i->hardware->index);
 349
 350         i->announcing = 1;
 351         avahi_announce_interface(m->server, i);
 352         avahi_multicast_lookup_engine_new_interface(m->server->multicast_lookup_engine, i);
 353     } else if (!b && i->announcing) {
 354         avahi_log_info("Interface %s.%s no longer relevant.", i->hardware->name, avahi_proto_to_string(i->protocol));
 355
 356         if (i->protocol == AVAHI_PROTO_INET)
 357             avahi_mdns_mcast_leave_ipv4(m->server->fd_ipv4, i->hardware->index);
 358         if (i->protocol == AVAHI_PROTO_INET6)
 359             avahi_mdns_mcast_leave_ipv6(m->server->fd_ipv6, i->hardware->index);
 360
 361         avahi_goodbye_interface(m->server, i, 0, 1);
 362         avahi_querier_free_all(i);
 363
 364         avahi_response_scheduler_clear(i->response_scheduler);
 365         avahi_query_scheduler_clear(i->query_scheduler);
 366         avahi_probe_scheduler_clear(i->probe_scheduler);
 367         avahi_cache_flush(i->cache);
 368
 369         i->announcing = 0;
 370     }
 371 }
 372
 373 void avahi_hw_interface_check_relevant(AvahiHwInterface *hw) {
 374     AvahiInterface *i;
 375
 376     assert(hw);
 377
 378     for (i = hw->interfaces; i; i = i->by_hardware_next)
 379         avahi_interface_check_relevant(i);
 380 }
 381
 382 void avahi_interface_monitor_check_relevant(AvahiInterfaceMonitor *m) {
 383     AvahiInterface *i;
 384
 385     assert(m);
 386
 387     for (i = m->interfaces; i; i = i->interface_next)
 388         avahi_interface_check_relevant(i);
 389 }
 390
 391 AvahiInterfaceMonitor *avahi_interface_monitor_new(AvahiServer *s) {
 392     AvahiInterfaceMonitor *m = NULL;
 393
 394     if (!(m = avahi_new0(AvahiInterfaceMonitor, 1)))
 395         return NULL; /* OOM */
 396
 397     m->server = s;
 398     m->list_complete = 0;
 399     m->hashmap = avahi_hashmap_new(avahi_int_hash, avahi_int_equal, NULL, NULL);
 400
 401     AVAHI_LLIST_HEAD_INIT(AvahiInterface, m->interfaces);
 402     AVAHI_LLIST_HEAD_INIT(AvahiHwInterface, m->hw_interfaces);
 403
 404     if (avahi_interface_monitor_init_osdep(m) < 0)
 405         goto fail;
 406
 407     return m;
 408
 409 fail:
 410     avahi_interface_monitor_free(m);
 411     return NULL;
 412 }
 413
 414 void avahi_interface_monitor_free(AvahiInterfaceMonitor *m) {
 415     assert(m);
 416
 417     while (m->hw_interfaces)
 418         avahi_hw_interface_free(m->hw_interfaces, 1);
 419
 420     assert(!m->interfaces);
 421
 422     avahi_interface_monitor_free_osdep(m);
 423
 424     if (m->hashmap)
 425         avahi_hashmap_free(m->hashmap);
 426
 427     avahi_free(m);
 428 }
 429
 430
 431 AvahiInterface* avahi_interface_monitor_get_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx, AvahiProtocol protocol) {
 432     AvahiHwInterface *hw;
 433     AvahiInterface *i;
 434
 435     assert(m);
 436     assert(idx >= 0);
 437     assert(protocol != AVAHI_PROTO_UNSPEC);
 438
 439     if (!(hw = avahi_interface_monitor_get_hw_interface(m, idx)))
 440         return NULL;
 441
 442     for (i = hw->interfaces; i; i = i->by_hardware_next)
 443         if (i->protocol == protocol)
 444             return i;
 445
 446     return NULL;
 447 }
 448
 449 AvahiHwInterface* avahi_interface_monitor_get_hw_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx) {
 450     assert(m);
 451     assert(idx > 0);
 452
 453     return avahi_hashmap_lookup(m->hashmap, &idx);
 454 }
 455
 456 AvahiInterfaceAddress* avahi_interface_monitor_get_address(AvahiInterfaceMonitor *m, AvahiInterface *i, const AvahiAddress *raddr) {
 457     AvahiInterfaceAddress *ia;
 458
 459     assert(m);
 460     assert(i);
 461     assert(raddr);
 462
 463     for (ia = i->addresses; ia; ia = ia->address_next)
 464         if (avahi_address_cmp(&ia->address, raddr) == 0)
 465             return ia;
 466
 467     return NULL;
 468 }
 469
 470
 471 void avahi_interface_send_packet_unicast(AvahiInterface *i, AvahiDnsPacket *p, const AvahiAddress *a, uint16_t port) {
 472     assert(i);
 473     assert(p);
 474 /*     char t[AVAHI_ADDRESS_STR_MAX]; */
 475
 476     if (!avahi_interface_is_relevant(i))
 477         return;
 478
 479     assert(!a || a->proto == i->protocol);
 480
 481 /*     if (a) */
 482 /*         avahi_log_debug("unicast sending on '%s.%i' to %s:%u", i->hardware->name, i->protocol, avahi_address_snprint(t, sizeof(t), a), port); */
 483 /*     else */
 484 /*         avahi_log_debug("multicast sending on '%s.%i'", i->hardware->name, i->protocol); */
 485
 486     if (i->protocol == AVAHI_PROTO_INET && i->monitor->server->fd_ipv4 >= 0)
 487         avahi_send_dns_packet_ipv4(i->monitor->server->fd_ipv4, i->hardware->index, p, a ? &a->data.ipv4 : NULL, port);
 488     else if (i->protocol == AVAHI_PROTO_INET6 && i->monitor->server->fd_ipv6 >= 0)
 489         avahi_send_dns_packet_ipv6(i->monitor->server->fd_ipv6, i->hardware->index, p, a ? &a->data.ipv6 : NULL, port);
 490 }
 491
 492 void avahi_interface_send_packet(AvahiInterface *i, AvahiDnsPacket *p) {
 493     assert(i);
 494     assert(p);
 495
 496     avahi_interface_send_packet_unicast(i, p, NULL, 0);
 497 }
 498
 499 int avahi_interface_post_query(AvahiInterface *i, AvahiKey *key, int immediately) {
 500     assert(i);
 501     assert(key);
 502
 503     if (avahi_interface_is_relevant(i))
 504         return avahi_query_scheduler_post(i->query_scheduler, key, immediately);
 505
 506     return 0;
 507 }
 508
 509 int avahi_interface_post_response(AvahiInterface *i, AvahiRecord *record, int flush_cache, const AvahiAddress *querier, int immediately) {
 510     assert(i);
 511     assert(record);
 512
 513     if (avahi_interface_is_relevant(i))
 514         return avahi_response_scheduler_post(i->response_scheduler, record, flush_cache, querier, immediately);
 515
 516     return 0;
 517 }
 518
 519 int avahi_interface_post_probe(AvahiInterface *i, AvahiRecord *record, int immediately) {
 520     assert(i);
 521     assert(record);
 522
 523     if (avahi_interface_is_relevant(i))
 524         return avahi_probe_scheduler_post(i->probe_scheduler, record, immediately);
 525
 526     return 0;
 527 }
 528
 529 int avahi_dump_caches(AvahiInterfaceMonitor *m, AvahiDumpCallback callback, void* userdata) {
 530     AvahiInterface *i;
 531     assert(m);
 532
 533     for (i = m->interfaces; i; i = i->interface_next) {
 534         if (avahi_interface_is_relevant(i)) {
 535             char ln[256];
 536             snprintf(ln, sizeof(ln), ";;; INTERFACE %s.%s ;;;", i->hardware->name, avahi_proto_to_string(i->protocol));
 537             callback(ln, userdata);
 538             if (avahi_cache_dump(i->cache, callback, userdata) < 0)
 539                 return -1;
 540         }
 541     }
 542
 543     return 0;
 544 }
 545
 546 int avahi_interface_is_relevant(AvahiInterface *i) {
 547     AvahiInterfaceAddress *a;
 548     int relevant_address;
 549
 550     assert(i);
 551
 552     relevant_address = 0;
 553
 554     for (a = i->addresses; a; a = a->address_next)
 555         if (avahi_interface_address_is_relevant(a)) {
 556             relevant_address = 1;
 557             break;
 558         }
 559
 560     return i->hardware->flags_ok && relevant_address;
 561 }
 562
 563 int avahi_interface_address_is_relevant(AvahiInterfaceAddress *a) {
 564     AvahiInterfaceAddress *b;
 565     assert(a);
 566
 567     /* Publish public IP addresses */
 568     if (a->global_scope)
 569         return 1;
 570     else {
 571
 572         /* Publish link local IP addresses if they are the only ones on the link */
 573         for (b = a->interface->addresses; b; b = b->address_next) {
 574             if (b == a)
 575                 continue;
 576
 577             if (b->global_scope)
 578                 return 0;
 579         }
 580
 581         return 1;
 582     }
 583
 584     return 0;
 585 }
 586
 587 int avahi_interface_match(AvahiInterface *i, AvahiIfIndex idx, AvahiProtocol protocol) {
 588     assert(i);
 589
 590     if (idx != AVAHI_IF_UNSPEC && idx != i->hardware->index)
 591         return 0;
 592
 593     if (protocol != AVAHI_PROTO_UNSPEC && protocol != i->protocol)
 594         return 0;
 595
 596     return 1;
 597 }
 598
 599 void avahi_interface_monitor_walk(AvahiInterfaceMonitor *m, AvahiIfIndex interface, AvahiProtocol protocol, AvahiInterfaceMonitorWalkCallback callback, void* userdata) {
 600     assert(m);
 601     assert(callback);
 602
 603     if (interface != AVAHI_IF_UNSPEC) {
 604         if (protocol != AVAHI_PROTO_UNSPEC) {
 605             AvahiInterface *i;
 606
 607             if ((i = avahi_interface_monitor_get_interface(m, interface, protocol)))
 608                 callback(m, i, userdata);
 609
 610         } else {
 611             AvahiHwInterface *hw;
 612             AvahiInterface *i;
 613
 614             if ((hw = avahi_interface_monitor_get_hw_interface(m, interface)))
 615                 for (i = hw->interfaces; i; i = i->by_hardware_next)
 616                     if (avahi_interface_match(i, interface, protocol))
 617                         callback(m, i, userdata);
 618         }
 619
 620     } else {
 621         AvahiInterface *i;
 622
 623         for (i = m->interfaces; i; i = i->interface_next)
 624             if (avahi_interface_match(i, interface, protocol))
 625                 callback(m, i, userdata);
 626     }
 627 }
 628
 629
 630 int avahi_address_is_local(AvahiInterfaceMonitor *m, const AvahiAddress *a) {
 631     AvahiInterface *i;
 632     AvahiInterfaceAddress *ia;
 633     assert(m);
 634     assert(a);
 635
 636     for (i = m->interfaces; i; i = i->interface_next)
 637         for (ia = i->addresses; ia; ia = ia->address_next)
 638             if (avahi_address_cmp(a, &ia->address) == 0)
 639                 return 1;
 640
 641     return 0;
 642 }
 643
 644 int avahi_interface_address_on_link(AvahiInterface *i, const AvahiAddress *a) {
 645     AvahiInterfaceAddress *ia;
 646
 647     assert(i);
 648     assert(a);
 649
 650     if (a->proto != i->protocol)
 651         return 0;
 652
 653     for (ia = i->addresses; ia; ia = ia->address_next) {
 654
 655         if (a->proto == AVAHI_PROTO_INET) {
 656             uint32_t m;
 657
 658             m = ~(((uint32_t) -1) >> ia->prefix_len);
 659
 660             if ((ntohl(a->data.ipv4.address) & m) == (ntohl(ia->address.data.ipv4.address) & m))
 661                 return 1;
 662         } else {
 663             unsigned j;
 664             unsigned char pl;
 665             assert(a->proto == AVAHI_PROTO_INET6);
 666
 667             pl = ia->prefix_len;
 668
 669             for (j = 0; j < 16; j++) {
 670                 uint8_t m;
 671
 672                 if (pl == 0)
 673                     return 1;
 674
 675                 if (pl >= 8) {
 676                     m = 0xFF;
 677                     pl -= 8;
 678                 } else {
 679                     m = ~(0xFF >> pl);
 680                     pl = 0;
 681                 }
 682
 683                 if ((a->data.ipv6.address[j] & m) != (ia->address.data.ipv6.address[j] & m))
 684                     break;
 685             }
 686         }
 687     }
 688
 689     return 0;
 690 }
 691
 692 int avahi_interface_has_address(AvahiInterfaceMonitor *m, AvahiIfIndex iface, const AvahiAddress *a) {
 693     AvahiInterface *i;
 694     AvahiInterfaceAddress *j;
 695
 696     assert(m);
 697     assert(iface != AVAHI_IF_UNSPEC);
 698     assert(a);
 699
 700     if (!(i = avahi_interface_monitor_get_interface(m, iface, a->proto)))
 701         return 0;
 702
 703     for (j = i->addresses; j; j = j->address_next)
 704         if (avahi_address_cmp(a, &j->address) == 0)
 705             return 1;
 706
 707     return 0;
 708 }