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 <errno.h>
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30
  31 #include <sys/types.h>
  32 #include <sys/socket.h>
  33
  34 #include <avahi-common/error.h>
  35 #include <avahi-common/malloc.h>
  36 #include <avahi-common/domain.h>
  37
  38 #include "iface.h"
  39 #include "dns.h"
  40 #include "socket.h"
  41 #include "announce.h"
  42 #include "util.h"
  43 #include "log.h"
  44 #include "multicast-lookup.h"
  45 #include "querier.h"
  46
  47 void avahi_interface_address_update_rrs(AvahiInterfaceAddress *a, int remove_rrs) {
  48     AvahiInterfaceMonitor *m;
  49
  50     assert(a);
  51     m = a->monitor;
  52
  53     if (a->interface->announcing &&
  54         m->list_complete &&
  55         avahi_interface_address_is_relevant(a) &&
  56         !remove_rrs &&
  57         m->server->config.publish_addresses &&
  58         (m->server->state == AVAHI_SERVER_RUNNING ||
  59         m->server->state == AVAHI_SERVER_REGISTERING)) {
  60
  61         /* Fill the entry group */
  62         if (!a->entry_group)
  63             a->entry_group = avahi_s_entry_group_new(m->server, avahi_host_rr_entry_group_callback, NULL);
  64
  65         if (!a->entry_group) /* OOM */
  66             return;
  67
  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);
  71
  72             avahi_log_info("Registering new address %s on %s.", t, a->interface->hardware->name);
  73
  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;
  78                 return;
  79             }
  80
  81             avahi_s_entry_group_commit(a->entry_group);
  82         }
  83     } else {
  84
  85         /* Clear the entry group */
  86
  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);
  90
  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);
  94
  95             avahi_log_info("Withdrawing address %s on %s.", t, a->interface->hardware->name);
  96
  97             avahi_s_entry_group_reset(a->entry_group);
  98         }
  99     }
 100 }
 101
 102 void avahi_interface_update_rrs(AvahiInterface *i, int remove_rrs) {
 103     AvahiInterfaceAddress *a;
 104
 105     assert(i);
 106
 107     for (a = i->addresses; a; a = a->address_next)
 108         avahi_interface_address_update_rrs(a, remove_rrs);
 109 }
 110
 111 void avahi_hw_interface_update_rrs(AvahiHwInterface *hw, int remove_rrs) {
 112     AvahiInterface *i;
 113     AvahiInterfaceMonitor *m;
 114
 115     assert(hw);
 116     m = hw->monitor;
 117
 118     for (i = hw->interfaces; i; i = i->by_hardware_next)
 119         avahi_interface_update_rrs(i, remove_rrs);
 120
 121     if (m->list_complete &&
 122         !remove_rrs &&
 123         m->server->config.publish_workstation &&
 124         (m->server->state == AVAHI_SERVER_RUNNING ||
 125         m->server->state == AVAHI_SERVER_REGISTERING)) {
 126
 127         if (!hw->entry_group)
 128             hw->entry_group = avahi_s_entry_group_new(m->server, avahi_host_rr_entry_group_callback, NULL);
 129
 130         if (!hw->entry_group)
 131             return; /* OOM */
 132
 133         if (avahi_s_entry_group_is_empty(hw->entry_group)) {
 134             char name[AVAHI_LABEL_MAX];
 135             char *t;
 136
 137             if (!(t = avahi_format_mac_address(hw->mac_address, hw->mac_address_size)))
 138                 return; /* OOM */
 139
 140             snprintf(name, sizeof(name), "%s [%s]", m->server->host_name, t);
 141             avahi_free(t);
 142
 143             if (!name)
 144                 return; /* OOM */
 145
 146             if (avahi_server_add_service(m->server, hw->entry_group, hw->index, AVAHI_PROTO_UNSPEC, 0, name, "_workstation._tcp", NULL, NULL, 9, NULL) < 0) {
 147                 avahi_log_warn(__FILE__": avahi_server_add_service() failed: %s", avahi_strerror(m->server->error));
 148                 avahi_s_entry_group_free(hw->entry_group);
 149                 hw->entry_group = NULL;
 150             } else
 151                 avahi_s_entry_group_commit(hw->entry_group);
 152         }
 153
 154     } else {
 155
 156         if (hw->entry_group && !avahi_s_entry_group_is_empty(hw->entry_group)) {
 157
 158             if (avahi_s_entry_group_get_state(hw->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING)
 159                 avahi_server_decrease_host_rr_pending(m->server);
 160
 161             avahi_s_entry_group_reset(hw->entry_group);
 162         }
 163     }
 164 }
 165
 166 void avahi_interface_monitor_update_rrs(AvahiInterfaceMonitor *m, int remove_rrs) {
 167     AvahiHwInterface *hw;
 168
 169     assert(m);
 170
 171     for (hw = m->hw_interfaces; hw; hw = hw->hardware_next)
 172         avahi_hw_interface_update_rrs(hw, remove_rrs);
 173 }
 174
 175 void avahi_interface_address_free(AvahiInterfaceAddress *a) {
 176     assert(a);
 177     assert(a->interface);
 178
 179     avahi_interface_address_update_rrs(a, 1);
 180     AVAHI_LLIST_REMOVE(AvahiInterfaceAddress, address, a->interface->addresses, a);
 181
 182     if (a->entry_group)
 183         avahi_s_entry_group_free(a->entry_group);
 184
 185     avahi_free(a);
 186 }
 187
 188 void avahi_interface_free(AvahiInterface *i, int send_goodbye) {
 189     assert(i);
 190
 191     /* Handle goodbyes and remove announcers */
 192     avahi_goodbye_interface(i->monitor->server, i, send_goodbye, 1);
 193     avahi_response_scheduler_force(i->response_scheduler);
 194     assert(!i->announcers);
 195
 196     /* Remove queriers */
 197     avahi_querier_free_all(i);
 198     avahi_hashmap_free(i->queriers_by_key);
 199
 200     /* Remove local RRs */
 201     avahi_interface_update_rrs(i, 1);
 202
 203     while (i->addresses)
 204         avahi_interface_address_free(i->addresses);
 205
 206     avahi_response_scheduler_free(i->response_scheduler);
 207     avahi_query_scheduler_free(i->query_scheduler);
 208     avahi_probe_scheduler_free(i->probe_scheduler);
 209     avahi_cache_free(i->cache);
 210
 211     AVAHI_LLIST_REMOVE(AvahiInterface, interface, i->monitor->interfaces, i);
 212     AVAHI_LLIST_REMOVE(AvahiInterface, by_hardware, i->hardware->interfaces, i);
 213
 214     avahi_free(i);
 215 }
 216
 217 void avahi_hw_interface_free(AvahiHwInterface *hw, int send_goodbye) {
 218     assert(hw);
 219
 220     avahi_hw_interface_update_rrs(hw, 1);
 221
 222     while (hw->interfaces)
 223         avahi_interface_free(hw->interfaces, send_goodbye);
 224
 225     if (hw->entry_group)
 226         avahi_s_entry_group_free(hw->entry_group);
 227
 228     AVAHI_LLIST_REMOVE(AvahiHwInterface, hardware, hw->monitor->hw_interfaces, hw);
 229     avahi_hashmap_remove(hw->monitor->hashmap, &hw->index);
 230
 231     avahi_free(hw->name);
 232     avahi_free(hw);
 233 }
 234
 235 AvahiInterface* avahi_interface_new(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, AvahiProtocol protocol) {
 236     AvahiInterface *i;
 237
 238     assert(m);
 239     assert(hw);
 240     assert(AVAHI_PROTO_VALID(protocol));
 241
 242     if (!(i = avahi_new(AvahiInterface, 1)))
 243         goto fail; /* OOM */
 244
 245     i->monitor = m;
 246     i->hardware = hw;
 247     i->protocol = protocol;
 248     i->announcing = 0;
 249
 250     AVAHI_LLIST_HEAD_INIT(AvahiInterfaceAddress, i->addresses);
 251     AVAHI_LLIST_HEAD_INIT(AvahiAnnouncer, i->announcers);
 252
 253     AVAHI_LLIST_HEAD_INIT(AvahiQuerier, i->queriers);
 254     i->queriers_by_key = avahi_hashmap_new((AvahiHashFunc) avahi_key_hash, (AvahiEqualFunc) avahi_key_equal, NULL, NULL);
 255
 256     i->cache = avahi_cache_new(m->server, i);
 257     i->response_scheduler = avahi_response_scheduler_new(i);
 258     i->query_scheduler = avahi_query_scheduler_new(i);
 259     i->probe_scheduler = avahi_probe_scheduler_new(i);
 260
 261     if (!i->cache || !i->response_scheduler || !i->query_scheduler || !i->probe_scheduler)
 262         goto fail; /* OOM */
 263
 264     AVAHI_LLIST_PREPEND(AvahiInterface, by_hardware, hw->interfaces, i);
 265     AVAHI_LLIST_PREPEND(AvahiInterface, interface, m->interfaces, i);
 266
 267     return i;
 268
 269 fail:
 270
 271     if (i) {
 272         if (i->cache)
 273             avahi_cache_free(i->cache);
 274         if (i->response_scheduler)
 275             avahi_response_scheduler_free(i->response_scheduler);
 276         if (i->query_scheduler)
 277             avahi_query_scheduler_free(i->query_scheduler);
 278         if (i->probe_scheduler)
 279             avahi_probe_scheduler_free(i->probe_scheduler);
 280     }
 281
 282     return NULL;
 283 }
 284
 285 AvahiHwInterface *avahi_hw_interface_new(AvahiInterfaceMonitor *m, AvahiIfIndex idx) {
 286     AvahiHwInterface *hw;
 287
 288     assert(m);
 289     assert(AVAHI_IF_VALID(idx));
 290
 291     if  (!(hw = avahi_new(AvahiHwInterface, 1)))
 292         return NULL;
 293
 294     hw->monitor = m;
 295     hw->name = NULL;
 296     hw->flags_ok = 0;
 297     hw->mtu = 1500;
 298     hw->index = idx;
 299     hw->mac_address_size = 0;
 300     hw->entry_group = NULL;
 301
 302     AVAHI_LLIST_HEAD_INIT(AvahiInterface, hw->interfaces);
 303     AVAHI_LLIST_PREPEND(AvahiHwInterface, hardware, m->hw_interfaces, hw);
 304
 305     avahi_hashmap_insert(m->hashmap, &hw->index, hw);
 306
 307     if (m->server->fd_ipv4 >= 0)
 308         avahi_interface_new(m, hw, AVAHI_PROTO_INET);
 309     if (m->server->fd_ipv6 >= 0)
 310         avahi_interface_new(m, hw, AVAHI_PROTO_INET6);
 311
 312     return hw;
 313 }
 314
 315 AvahiInterfaceAddress *avahi_interface_address_new(AvahiInterfaceMonitor *m, AvahiInterface *i, const AvahiAddress *addr, unsigned prefix_len) {
 316     AvahiInterfaceAddress *a;
 317
 318     assert(m);
 319     assert(i);
 320
 321     if (!(a = avahi_new(AvahiInterfaceAddress, 1)))
 322         return NULL;
 323
 324     a->interface = i;
 325     a->monitor = m;
 326     a->address = *addr;
 327     a->prefix_len = prefix_len;
 328     a->global_scope = 0;
 329     a->entry_group = NULL;
 330
 331     AVAHI_LLIST_PREPEND(AvahiInterfaceAddress, address, i->addresses, a);
 332
 333     return a;
 334 }
 335
 336 static int interface_mdns_mcast_join(AvahiInterface *i, int join) {
 337
 338     if (i->protocol == AVAHI_PROTO_INET6)
 339         return avahi_mdns_mcast_join_ipv6(i->monitor->server->fd_ipv6, i->hardware->index, join);
 340     else if (i->protocol == AVAHI_PROTO_INET) {
 341
 342 #ifdef HAVE_STRUCT_IP_MREQN
 343         return avahi_mdns_mcast_join_ipv4(i->monitor->server->fd_ipv4, i->hardware->index, join);
 344
 345 #else
 346         AvahiInterfaceAddress *ia;
 347         int r = 0;
 348
 349         for (ia = i->addresses; ia; ia = ia->address_next)
 350             r  |= avahi_mdns_mcast_join_ipv4(i->monitor->server->fd_ipv4, &ia->address, join);
 351
 352         return r;
 353 #endif
 354     }
 355
 356     abort();
 357 }
 358
 359
 360 void avahi_interface_check_relevant(AvahiInterface *i) {
 361     int b;
 362     AvahiInterfaceMonitor *m;
 363
 364     assert(i);
 365     m = i->monitor;
 366
 367     b = avahi_interface_is_relevant(i);
 368
 369     if (m->list_complete && b && !i->announcing) {
 370         avahi_log_info("New relevant interface %s.%s.", i->hardware->name, avahi_proto_to_string(i->protocol));
 371
 372         interface_mdns_mcast_join(i, 1);
 373
 374         i->announcing = 1;
 375         avahi_announce_interface(m->server, i);
 376         avahi_multicast_lookup_engine_new_interface(m->server->multicast_lookup_engine, i);
 377     } else if (!b && i->announcing) {
 378         avahi_log_info("Interface %s.%s no longer relevant.", i->hardware->name, avahi_proto_to_string(i->protocol));
 379
 380         interface_mdns_mcast_join(i, 0);
 381
 382         avahi_goodbye_interface(m->server, i, 0, 1);
 383         avahi_querier_free_all(i);
 384
 385         avahi_response_scheduler_clear(i->response_scheduler);
 386         avahi_query_scheduler_clear(i->query_scheduler);
 387         avahi_probe_scheduler_clear(i->probe_scheduler);
 388         avahi_cache_flush(i->cache);
 389
 390         i->announcing = 0;
 391     }
 392 }
 393
 394 void avahi_hw_interface_check_relevant(AvahiHwInterface *hw) {
 395     AvahiInterface *i;
 396
 397     assert(hw);
 398
 399     for (i = hw->interfaces; i; i = i->by_hardware_next)
 400         avahi_interface_check_relevant(i);
 401 }
 402
 403 void avahi_interface_monitor_check_relevant(AvahiInterfaceMonitor *m) {
 404     AvahiInterface *i;
 405
 406     assert(m);
 407
 408     for (i = m->interfaces; i; i = i->interface_next)
 409         avahi_interface_check_relevant(i);
 410 }
 411
 412 AvahiInterfaceMonitor *avahi_interface_monitor_new(AvahiServer *s) {
 413     AvahiInterfaceMonitor *m = NULL;
 414
 415     if (!(m = avahi_new0(AvahiInterfaceMonitor, 1)))
 416         return NULL; /* OOM */
 417
 418     m->server = s;
 419     m->list_complete = 0;
 420     m->hashmap = avahi_hashmap_new(avahi_int_hash, avahi_int_equal, NULL, NULL);
 421
 422     AVAHI_LLIST_HEAD_INIT(AvahiInterface, m->interfaces);
 423     AVAHI_LLIST_HEAD_INIT(AvahiHwInterface, m->hw_interfaces);
 424
 425     if (avahi_interface_monitor_init_osdep(m) < 0)
 426         goto fail;
 427
 428     return m;
 429
 430 fail:
 431     avahi_interface_monitor_free(m);
 432     return NULL;
 433 }
 434
 435 void avahi_interface_monitor_free(AvahiInterfaceMonitor *m) {
 436     assert(m);
 437
 438     while (m->hw_interfaces)
 439         avahi_hw_interface_free(m->hw_interfaces, 1);
 440
 441     assert(!m->interfaces);
 442
 443     avahi_interface_monitor_free_osdep(m);
 444
 445     if (m->hashmap)
 446         avahi_hashmap_free(m->hashmap);
 447
 448     avahi_free(m);
 449 }
 450
 451
 452 AvahiInterface* avahi_interface_monitor_get_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx, AvahiProtocol protocol) {
 453     AvahiHwInterface *hw;
 454     AvahiInterface *i;
 455
 456     assert(m);
 457     assert(idx >= 0);
 458     assert(protocol != AVAHI_PROTO_UNSPEC);
 459
 460     if (!(hw = avahi_interface_monitor_get_hw_interface(m, idx)))
 461         return NULL;
 462
 463     for (i = hw->interfaces; i; i = i->by_hardware_next)
 464         if (i->protocol == protocol)
 465             return i;
 466
 467     return NULL;
 468 }
 469
 470 AvahiHwInterface* avahi_interface_monitor_get_hw_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx) {
 471     assert(m);
 472     assert(idx > 0);
 473
 474     return avahi_hashmap_lookup(m->hashmap, &idx);
 475 }
 476
 477 AvahiInterfaceAddress* avahi_interface_monitor_get_address(AvahiInterfaceMonitor *m, AvahiInterface *i, const AvahiAddress *raddr) {
 478     AvahiInterfaceAddress *ia;
 479
 480     assert(m);
 481     assert(i);
 482     assert(raddr);
 483
 484     for (ia = i->addresses; ia; ia = ia->address_next)
 485         if (avahi_address_cmp(&ia->address, raddr) == 0)
 486             return ia;
 487
 488     return NULL;
 489 }
 490
 491
 492 void avahi_interface_send_packet_unicast(AvahiInterface *i, AvahiDnsPacket *p, const AvahiAddress *a, uint16_t port) {
 493     assert(i);
 494     assert(p);
 495 /*     char t[AVAHI_ADDRESS_STR_MAX]; */
 496
 497     if (!avahi_interface_is_relevant(i))
 498         return;
 499
 500     assert(!a || a->proto == i->protocol);
 501
 502 /*     if (a) */
 503 /*         avahi_log_debug("unicast sending on '%s.%i' to %s:%u", i->hardware->name, i->protocol, avahi_address_snprint(t, sizeof(t), a), port); */
 504 /*     else */
 505 /*         avahi_log_debug("multicast sending on '%s.%i'", i->hardware->name, i->protocol); */
 506
 507     if (i->protocol == AVAHI_PROTO_INET && i->monitor->server->fd_ipv4 >= 0)
 508         avahi_send_dns_packet_ipv4(i->monitor->server->fd_ipv4, i->hardware->index, p, a ? &a->data.ipv4 : NULL, port);
 509     else if (i->protocol == AVAHI_PROTO_INET6 && i->monitor->server->fd_ipv6 >= 0)
 510         avahi_send_dns_packet_ipv6(i->monitor->server->fd_ipv6, i->hardware->index, p, a ? &a->data.ipv6 : NULL, port);
 511 }
 512
 513 void avahi_interface_send_packet(AvahiInterface *i, AvahiDnsPacket *p) {
 514     assert(i);
 515     assert(p);
 516
 517     avahi_interface_send_packet_unicast(i, p, NULL, 0);
 518 }
 519
 520 int avahi_interface_post_query(AvahiInterface *i, AvahiKey *key, int immediately) {
 521     assert(i);
 522     assert(key);
 523
 524     if (avahi_interface_is_relevant(i))
 525         return avahi_query_scheduler_post(i->query_scheduler, key, immediately);
 526
 527     return 0;
 528 }
 529
 530 int avahi_interface_post_response(AvahiInterface *i, AvahiRecord *record, int flush_cache, const AvahiAddress *querier, int immediately) {
 531     assert(i);
 532     assert(record);
 533
 534     if (avahi_interface_is_relevant(i))
 535         return avahi_response_scheduler_post(i->response_scheduler, record, flush_cache, querier, immediately);
 536
 537     return 0;
 538 }
 539
 540 int avahi_interface_post_probe(AvahiInterface *i, AvahiRecord *record, int immediately) {
 541     assert(i);
 542     assert(record);
 543
 544     if (avahi_interface_is_relevant(i))
 545         return avahi_probe_scheduler_post(i->probe_scheduler, record, immediately);
 546
 547     return 0;
 548 }
 549
 550 int avahi_dump_caches(AvahiInterfaceMonitor *m, AvahiDumpCallback callback, void* userdata) {
 551     AvahiInterface *i;
 552     assert(m);
 553
 554     for (i = m->interfaces; i; i = i->interface_next) {
 555         if (avahi_interface_is_relevant(i)) {
 556             char ln[256];
 557             snprintf(ln, sizeof(ln), ";;; INTERFACE %s.%s ;;;", i->hardware->name, avahi_proto_to_string(i->protocol));
 558             callback(ln, userdata);
 559             if (avahi_cache_dump(i->cache, callback, userdata) < 0)
 560                 return -1;
 561         }
 562     }
 563
 564     return 0;
 565 }
 566
 567 int avahi_interface_is_relevant(AvahiInterface *i) {
 568     AvahiInterfaceAddress *a;
 569     int relevant_address;
 570
 571     assert(i);
 572
 573     relevant_address = 0;
 574
 575     for (a = i->addresses; a; a = a->address_next)
 576         if (avahi_interface_address_is_relevant(a)) {
 577             relevant_address = 1;
 578             break;
 579         }
 580
 581     return i->hardware->flags_ok && relevant_address;
 582 }
 583
 584 int avahi_interface_address_is_relevant(AvahiInterfaceAddress *a) {
 585     AvahiInterfaceAddress *b;
 586     assert(a);
 587
 588     /* Publish public IP addresses */
 589     if (a->global_scope)
 590         return 1;
 591     else {
 592
 593         /* Publish link local IP addresses if they are the only ones on the link */
 594         for (b = a->interface->addresses; b; b = b->address_next) {
 595             if (b == a)
 596                 continue;
 597
 598             if (b->global_scope)
 599                 return 0;
 600         }
 601
 602         return 1;
 603     }
 604
 605     return 0;
 606 }
 607
 608 int avahi_interface_match(AvahiInterface *i, AvahiIfIndex idx, AvahiProtocol protocol) {
 609     assert(i);
 610
 611     if (idx != AVAHI_IF_UNSPEC && idx != i->hardware->index)
 612         return 0;
 613
 614     if (protocol != AVAHI_PROTO_UNSPEC && protocol != i->protocol)
 615         return 0;
 616
 617     return 1;
 618 }
 619
 620 void avahi_interface_monitor_walk(AvahiInterfaceMonitor *m, AvahiIfIndex interface, AvahiProtocol protocol, AvahiInterfaceMonitorWalkCallback callback, void* userdata) {
 621     assert(m);
 622     assert(callback);
 623
 624     if (interface != AVAHI_IF_UNSPEC) {
 625         if (protocol != AVAHI_PROTO_UNSPEC) {
 626             AvahiInterface *i;
 627
 628             if ((i = avahi_interface_monitor_get_interface(m, interface, protocol)))
 629                 callback(m, i, userdata);
 630
 631         } else {
 632             AvahiHwInterface *hw;
 633             AvahiInterface *i;
 634
 635             if ((hw = avahi_interface_monitor_get_hw_interface(m, interface)))
 636                 for (i = hw->interfaces; i; i = i->by_hardware_next)
 637                     if (avahi_interface_match(i, interface, protocol))
 638                         callback(m, i, userdata);
 639         }
 640
 641     } else {
 642         AvahiInterface *i;
 643
 644         for (i = m->interfaces; i; i = i->interface_next)
 645             if (avahi_interface_match(i, interface, protocol))
 646                 callback(m, i, userdata);
 647     }
 648 }
 649
 650
 651 int avahi_address_is_local(AvahiInterfaceMonitor *m, const AvahiAddress *a) {
 652     AvahiInterface *i;
 653     AvahiInterfaceAddress *ia;
 654     assert(m);
 655     assert(a);
 656
 657     for (i = m->interfaces; i; i = i->interface_next)
 658         for (ia = i->addresses; ia; ia = ia->address_next)
 659             if (avahi_address_cmp(a, &ia->address) == 0)
 660                 return 1;
 661
 662     return 0;
 663 }
 664
 665 int avahi_interface_address_on_link(AvahiInterface *i, const AvahiAddress *a) {
 666     AvahiInterfaceAddress *ia;
 667
 668     assert(i);
 669     assert(a);
 670
 671     if (a->proto != i->protocol)
 672         return 0;
 673
 674     for (ia = i->addresses; ia; ia = ia->address_next) {
 675
 676         if (a->proto == AVAHI_PROTO_INET) {
 677             uint32_t m;
 678
 679             m = ~(((uint32_t) -1) >> ia->prefix_len);
 680
 681             if ((ntohl(a->data.ipv4.address) & m) == (ntohl(ia->address.data.ipv4.address) & m))
 682                 return 1;
 683         } else {
 684             unsigned j;
 685             unsigned char pl;
 686             assert(a->proto == AVAHI_PROTO_INET6);
 687
 688             pl = ia->prefix_len;
 689
 690             for (j = 0; j < 16; j++) {
 691                 uint8_t m;
 692
 693                 if (pl == 0)
 694                     return 1;
 695
 696                 if (pl >= 8) {
 697                     m = 0xFF;
 698                     pl -= 8;
 699                 } else {
 700                     m = ~(0xFF >> pl);
 701                     pl = 0;
 702                 }
 703
 704                 if ((a->data.ipv6.address[j] & m) != (ia->address.data.ipv6.address[j] & m))
 705                     break;
 706             }
 707         }
 708     }
 709
 710     return 0;
 711 }
 712
 713 int avahi_interface_has_address(AvahiInterfaceMonitor *m, AvahiIfIndex iface, const AvahiAddress *a) {
 714     AvahiInterface *i;
 715     AvahiInterfaceAddress *j;
 716
 717     assert(m);
 718     assert(iface != AVAHI_IF_UNSPEC);
 719     assert(a);
 720
 721     if (!(i = avahi_interface_monitor_get_interface(m, iface, a->proto)))
 722         return 0;
 723
 724     for (j = i->addresses; j; j = j->address_next)
 725         if (avahi_address_cmp(a, &j->address) == 0)
 726             return 1;
 727
 728     return 0;
 729 }