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 #include <stdlib.h>
  31
  32 #include <avahi-common/error.h>
  33 #include <avahi-common/malloc.h>
  34 #include <avahi-common/domain.h>
  35
  36 #include "iface.h"
  37 #include "dns.h"
  38 #include "socket.h"
  39 #include "announce.h"
  40 #include "util.h"
  41 #include "log.h"
  42 #include "multicast-lookup.h"
  43 #include "querier.h"
  44
  45 void avahi_interface_address_update_rrs(AvahiInterfaceAddress *a, int remove_rrs) {
  46     AvahiInterfaceMonitor *m;
  47
  48     assert(a);
  49     m = a->monitor;
  50
  51     if (a->interface->announcing &&
  52         m->list_complete &&
  53         avahi_interface_address_is_relevant(a) &&
  54         !remove_rrs &&
  55         m->server->config.publish_addresses &&
  56         (m->server->state == AVAHI_SERVER_RUNNING ||
  57         m->server->state == AVAHI_SERVER_REGISTERING)) {
  58
  59         /* Fill the entry group */
  60         if (!a->entry_group)
  61             a->entry_group = avahi_s_entry_group_new(m->server, avahi_host_rr_entry_group_callback, NULL);
  62
  63         if (!a->entry_group) /* OOM */
  64             return;
  65
  66         if (avahi_s_entry_group_is_empty(a->entry_group)) {
  67             char t[AVAHI_ADDRESS_STR_MAX];
  68             avahi_address_snprint(t, sizeof(t), &a->address);
  69
  70             avahi_log_info("Registering new address %s on %s.", t, a->interface->hardware->name);
  71
  72             if (avahi_server_add_address(m->server, a->entry_group, a->interface->hardware->index, a->interface->protocol, 0, NULL, &a->address) < 0) {
  73                 avahi_log_warn(__FILE__": avahi_server_add_address() failed: %s", avahi_strerror(m->server->error));
  74                 avahi_s_entry_group_free(a->entry_group);
  75                 a->entry_group = NULL;
  76                 return;
  77             }
  78
  79             avahi_s_entry_group_commit(a->entry_group);
  80         }
  81     } else {
  82
  83         /* Clear the entry group */
  84
  85         if (a->entry_group && !avahi_s_entry_group_is_empty(a->entry_group)) {
  86             char t[AVAHI_ADDRESS_STR_MAX];
  87             avahi_address_snprint(t, sizeof(t), &a->address);
  88
  89             if (avahi_s_entry_group_get_state(a->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING &&
  90                 m->server->state == AVAHI_SERVER_REGISTERING)
  91                 avahi_server_decrease_host_rr_pending(m->server);
  92
  93             avahi_log_info("Withdrawing address %s on %s.", t, a->interface->hardware->name);
  94
  95             avahi_s_entry_group_reset(a->entry_group);
  96         }
  97     }
  98 }
  99
 100 void avahi_interface_update_rrs(AvahiInterface *i, int remove_rrs) {
 101     AvahiInterfaceAddress *a;
 102
 103     assert(i);
 104
 105     for (a = i->addresses; a; a = a->address_next)
 106         avahi_interface_address_update_rrs(a, remove_rrs);
 107 }
 108
 109 void avahi_hw_interface_update_rrs(AvahiHwInterface *hw, int remove_rrs) {
 110     AvahiInterface *i;
 111     AvahiInterfaceMonitor *m;
 112
 113     assert(hw);
 114     m = hw->monitor;
 115
 116     for (i = hw->interfaces; i; i = i->by_hardware_next)
 117         avahi_interface_update_rrs(i, remove_rrs);
 118
 119     if (m->list_complete &&
 120         !remove_rrs &&
 121         m->server->config.publish_workstation &&
 122         (m->server->state == AVAHI_SERVER_RUNNING ||
 123         m->server->state == AVAHI_SERVER_REGISTERING)) {
 124
 125         if (!hw->entry_group)
 126             hw->entry_group = avahi_s_entry_group_new(m->server, avahi_host_rr_entry_group_callback, NULL);
 127
 128         if (!hw->entry_group)
 129             return; /* OOM */
 130
 131         if (avahi_s_entry_group_is_empty(hw->entry_group)) {
 132             char name[AVAHI_LABEL_MAX];
 133             char *t;
 134
 135             if (!(t = avahi_format_mac_address(hw->mac_address, hw->mac_address_size)))
 136                 return; /* OOM */
 137
 138             snprintf(name, sizeof(name), "%s [%s]", m->server->host_name, t);
 139             avahi_free(t);
 140
 141             if (!name)
 142                 return; /* OOM */
 143
 144             if (avahi_server_add_service(m->server, hw->entry_group, hw->index, AVAHI_PROTO_UNSPEC, 0, name, "_workstation._tcp", NULL, NULL, 9, NULL) < 0) {
 145                 avahi_log_warn(__FILE__": avahi_server_add_service() failed: %s", avahi_strerror(m->server->error));
 146                 avahi_s_entry_group_free(hw->entry_group);
 147                 hw->entry_group = NULL;
 148             } else
 149                 avahi_s_entry_group_commit(hw->entry_group);
 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
 164 void avahi_interface_monitor_update_rrs(AvahiInterfaceMonitor *m, int remove_rrs) {
 165     AvahiHwInterface *hw;
 166
 167     assert(m);
 168
 169     for (hw = m->hw_interfaces; hw; hw = hw->hardware_next)
 170         avahi_hw_interface_update_rrs(hw, remove_rrs);
 171 }
 172
 173 void avahi_interface_address_free(AvahiInterfaceAddress *a) {
 174     assert(a);
 175     assert(a->interface);
 176
 177     avahi_interface_address_update_rrs(a, 1);
 178     AVAHI_LLIST_REMOVE(AvahiInterfaceAddress, address, a->interface->addresses, a);
 179
 180     if (a->entry_group)
 181         avahi_s_entry_group_free(a->entry_group);
 182
 183     avahi_free(a);
 184 }
 185
 186 void avahi_interface_free(AvahiInterface *i, int send_goodbye) {
 187     assert(i);
 188
 189     /* Handle goodbyes and remove announcers */
 190     avahi_goodbye_interface(i->monitor->server, i, send_goodbye, 1);
 191     avahi_response_scheduler_force(i->response_scheduler);
 192     assert(!i->announcers);
 193
 194     /* Remove queriers */
 195     avahi_querier_free_all(i);
 196     avahi_hashmap_free(i->queriers_by_key);
 197
 198     /* Remove local RRs */
 199     avahi_interface_update_rrs(i, 1);
 200
 201     while (i->addresses)
 202         avahi_interface_address_free(i->addresses);
 203
 204     avahi_response_scheduler_free(i->response_scheduler);
 205     avahi_query_scheduler_free(i->query_scheduler);
 206     avahi_probe_scheduler_free(i->probe_scheduler);
 207     avahi_cache_free(i->cache);
 208
 209     AVAHI_LLIST_REMOVE(AvahiInterface, interface, i->monitor->interfaces, i);
 210     AVAHI_LLIST_REMOVE(AvahiInterface, by_hardware, i->hardware->interfaces, i);
 211
 212     avahi_free(i);
 213 }
 214
 215 void avahi_hw_interface_free(AvahiHwInterface *hw, int send_goodbye) {
 216     assert(hw);
 217
 218     avahi_hw_interface_update_rrs(hw, 1);
 219
 220     while (hw->interfaces)
 221         avahi_interface_free(hw->interfaces, send_goodbye);
 222
 223     if (hw->entry_group)
 224         avahi_s_entry_group_free(hw->entry_group);
 225
 226     AVAHI_LLIST_REMOVE(AvahiHwInterface, hardware, hw->monitor->hw_interfaces, hw);
 227     avahi_hashmap_remove(hw->monitor->hashmap, &hw->index);
 228
 229     avahi_free(hw->name);
 230     avahi_free(hw);
 231 }
 232
 233 AvahiInterface* avahi_interface_new(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, AvahiProtocol protocol) {
 234     AvahiInterface *i;
 235
 236     assert(m);
 237     assert(hw);
 238     assert(AVAHI_PROTO_VALID(protocol));
 239
 240     if (!(i = avahi_new(AvahiInterface, 1)))
 241         goto fail; /* OOM */
 242
 243     i->monitor = m;
 244     i->hardware = hw;
 245     i->protocol = protocol;
 246     i->announcing = 0;
 247
 248     AVAHI_LLIST_HEAD_INIT(AvahiInterfaceAddress, i->addresses);
 249     AVAHI_LLIST_HEAD_INIT(AvahiAnnouncer, i->announcers);
 250
 251     AVAHI_LLIST_HEAD_INIT(AvahiQuerier, i->queriers);
 252     i->queriers_by_key = avahi_hashmap_new((AvahiHashFunc) avahi_key_hash, (AvahiEqualFunc) avahi_key_equal, NULL, NULL);
 253
 254     i->cache = avahi_cache_new(m->server, i);
 255     i->response_scheduler = avahi_response_scheduler_new(i);
 256     i->query_scheduler = avahi_query_scheduler_new(i);
 257     i->probe_scheduler = avahi_probe_scheduler_new(i);
 258
 259     if (!i->cache || !i->response_scheduler || !i->query_scheduler || !i->probe_scheduler)
 260         goto fail; /* OOM */
 261
 262     AVAHI_LLIST_PREPEND(AvahiInterface, by_hardware, hw->interfaces, i);
 263     AVAHI_LLIST_PREPEND(AvahiInterface, interface, m->interfaces, i);
 264
 265     return i;
 266
 267 fail:
 268
 269     if (i) {
 270         if (i->cache)
 271             avahi_cache_free(i->cache);
 272         if (i->response_scheduler)
 273             avahi_response_scheduler_free(i->response_scheduler);
 274         if (i->query_scheduler)
 275             avahi_query_scheduler_free(i->query_scheduler);
 276         if (i->probe_scheduler)
 277             avahi_probe_scheduler_free(i->probe_scheduler);
 278     }
 279
 280     return NULL;
 281 }
 282
 283 AvahiHwInterface *avahi_hw_interface_new(AvahiInterfaceMonitor *m, AvahiIfIndex idx) {
 284     AvahiHwInterface *hw;
 285
 286     assert(m);
 287     assert(AVAHI_IF_VALID(idx));
 288
 289     if  (!(hw = avahi_new(AvahiHwInterface, 1)))
 290         return NULL;
 291
 292     hw->monitor = m;
 293     hw->name = NULL;
 294     hw->flags_ok = 0;
 295     hw->mtu = 1500;
 296     hw->index = idx;
 297     hw->mac_address_size = 0;
 298     hw->entry_group = NULL;
 299
 300     AVAHI_LLIST_HEAD_INIT(AvahiInterface, hw->interfaces);
 301     AVAHI_LLIST_PREPEND(AvahiHwInterface, hardware, m->hw_interfaces, hw);
 302
 303     avahi_hashmap_insert(m->hashmap, &hw->index, hw);
 304
 305     if (m->server->fd_ipv4 >= 0)
 306         avahi_interface_new(m, hw, AVAHI_PROTO_INET);
 307     if (m->server->fd_ipv6 >= 0)
 308         avahi_interface_new(m, hw, AVAHI_PROTO_INET6);
 309
 310     return hw;
 311 }
 312
 313 AvahiInterfaceAddress *avahi_interface_address_new(AvahiInterfaceMonitor *m, AvahiInterface *i, const AvahiAddress *addr, unsigned prefix_len) {
 314     AvahiInterfaceAddress *a;
 315
 316     assert(m);
 317     assert(i);
 318
 319     if (!(a = avahi_new(AvahiInterfaceAddress, 1)))
 320         return NULL;
 321
 322     a->interface = i;
 323     a->monitor = m;
 324     a->address = *addr;
 325     a->prefix_len = prefix_len;
 326     a->global_scope = 0;
 327     a->entry_group = NULL;
 328
 329     AVAHI_LLIST_PREPEND(AvahiInterfaceAddress, address, i->addresses, a);
 330
 331     return a;
 332 }
 333
 334 static int interface_mdns_mcast_join(AvahiInterface *i, int join) {
 335
 336     if (i->protocol == AVAHI_PROTO_INET6)
 337         return avahi_mdns_mcast_join_ipv6(i->monitor->server->fd_ipv6, i->hardware->index, join);
 338     else if (i->protocol == AVAHI_PROTO_INET) {
 339
 340 #ifdef HAVE_STRUCT_IP_MREQN
 341         return avahi_mdns_mcast_join_ipv4(i->monitor->server->fd_ipv4, i->hardware->index, join);
 342
 343 #else
 344         AvahiInterfaceAddress *ia;
 345         int r = 0;
 346
 347         for (ia = i->addresses; ia; ia = ia->address_next)
 348             r  |= avahi_mdns_mcast_join_ipv4(i->monitor->server->fd_ipv4, &ia->address, join);
 349
 350         return r;
 351 #endif
 352     }
 353
 354     abort();
 355 }
 356
 357
 358 void avahi_interface_check_relevant(AvahiInterface *i) {
 359     int b;
 360     AvahiInterfaceMonitor *m;
 361
 362     assert(i);
 363     m = i->monitor;
 364
 365     b = avahi_interface_is_relevant(i);
 366
 367     if (m->list_complete && b && !i->announcing) {
 368         avahi_log_info("New relevant interface %s.%s.", i->hardware->name, avahi_proto_to_string(i->protocol));
 369
 370         interface_mdns_mcast_join(i, 1);
 371
 372         i->announcing = 1;
 373         avahi_announce_interface(m->server, i);
 374         avahi_multicast_lookup_engine_new_interface(m->server->multicast_lookup_engine, i);
 375     } else if (!b && i->announcing) {
 376         avahi_log_info("Interface %s.%s no longer relevant.", i->hardware->name, avahi_proto_to_string(i->protocol));
 377
 378         interface_mdns_mcast_join(i, 0);
 379
 380         avahi_goodbye_interface(m->server, i, 0, 1);
 381         avahi_querier_free_all(i);
 382
 383         avahi_response_scheduler_clear(i->response_scheduler);
 384         avahi_query_scheduler_clear(i->query_scheduler);
 385         avahi_probe_scheduler_clear(i->probe_scheduler);
 386         avahi_cache_flush(i->cache);
 387
 388         i->announcing = 0;
 389     }
 390 }
 391
 392 void avahi_hw_interface_check_relevant(AvahiHwInterface *hw) {
 393     AvahiInterface *i;
 394
 395     assert(hw);
 396
 397     for (i = hw->interfaces; i; i = i->by_hardware_next)
 398         avahi_interface_check_relevant(i);
 399 }
 400
 401 void avahi_interface_monitor_check_relevant(AvahiInterfaceMonitor *m) {
 402     AvahiInterface *i;
 403
 404     assert(m);
 405
 406     for (i = m->interfaces; i; i = i->interface_next)
 407         avahi_interface_check_relevant(i);
 408 }
 409
 410 AvahiInterfaceMonitor *avahi_interface_monitor_new(AvahiServer *s) {
 411     AvahiInterfaceMonitor *m = NULL;
 412
 413     if (!(m = avahi_new0(AvahiInterfaceMonitor, 1)))
 414         return NULL; /* OOM */
 415
 416     m->server = s;
 417     m->list_complete = 0;
 418     m->hashmap = avahi_hashmap_new(avahi_int_hash, avahi_int_equal, NULL, NULL);
 419
 420     AVAHI_LLIST_HEAD_INIT(AvahiInterface, m->interfaces);
 421     AVAHI_LLIST_HEAD_INIT(AvahiHwInterface, m->hw_interfaces);
 422
 423     if (avahi_interface_monitor_init_osdep(m) < 0)
 424         goto fail;
 425
 426     return m;
 427
 428 fail:
 429     avahi_interface_monitor_free(m);
 430     return NULL;
 431 }
 432
 433 void avahi_interface_monitor_free(AvahiInterfaceMonitor *m) {
 434     assert(m);
 435
 436     while (m->hw_interfaces)
 437         avahi_hw_interface_free(m->hw_interfaces, 1);
 438
 439     assert(!m->interfaces);
 440
 441     avahi_interface_monitor_free_osdep(m);
 442
 443     if (m->hashmap)
 444         avahi_hashmap_free(m->hashmap);
 445
 446     avahi_free(m);
 447 }
 448
 449
 450 AvahiInterface* avahi_interface_monitor_get_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx, AvahiProtocol protocol) {
 451     AvahiHwInterface *hw;
 452     AvahiInterface *i;
 453
 454     assert(m);
 455     assert(idx >= 0);
 456     assert(protocol != AVAHI_PROTO_UNSPEC);
 457
 458     if (!(hw = avahi_interface_monitor_get_hw_interface(m, idx)))
 459         return NULL;
 460
 461     for (i = hw->interfaces; i; i = i->by_hardware_next)
 462         if (i->protocol == protocol)
 463             return i;
 464
 465     return NULL;
 466 }
 467
 468 AvahiHwInterface* avahi_interface_monitor_get_hw_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx) {
 469     assert(m);
 470     assert(idx > 0);
 471
 472     return avahi_hashmap_lookup(m->hashmap, &idx);
 473 }
 474
 475 AvahiInterfaceAddress* avahi_interface_monitor_get_address(AvahiInterfaceMonitor *m, AvahiInterface *i, const AvahiAddress *raddr) {
 476     AvahiInterfaceAddress *ia;
 477
 478     assert(m);
 479     assert(i);
 480     assert(raddr);
 481
 482     for (ia = i->addresses; ia; ia = ia->address_next)
 483         if (avahi_address_cmp(&ia->address, raddr) == 0)
 484             return ia;
 485
 486     return NULL;
 487 }
 488
 489
 490 void avahi_interface_send_packet_unicast(AvahiInterface *i, AvahiDnsPacket *p, const AvahiAddress *a, uint16_t port) {
 491     assert(i);
 492     assert(p);
 493 /*     char t[AVAHI_ADDRESS_STR_MAX]; */
 494
 495     if (!avahi_interface_is_relevant(i))
 496         return;
 497
 498     assert(!a || a->proto == i->protocol);
 499
 500 /*     if (a) */
 501 /*         avahi_log_debug("unicast sending on '%s.%i' to %s:%u", i->hardware->name, i->protocol, avahi_address_snprint(t, sizeof(t), a), port); */
 502 /*     else */
 503 /*         avahi_log_debug("multicast sending on '%s.%i'", i->hardware->name, i->protocol); */
 504
 505     if (i->protocol == AVAHI_PROTO_INET && i->monitor->server->fd_ipv4 >= 0)
 506         avahi_send_dns_packet_ipv4(i->monitor->server->fd_ipv4, i->hardware->index, p, a ? &a->data.ipv4 : NULL, port);
 507     else if (i->protocol == AVAHI_PROTO_INET6 && i->monitor->server->fd_ipv6 >= 0)
 508         avahi_send_dns_packet_ipv6(i->monitor->server->fd_ipv6, i->hardware->index, p, a ? &a->data.ipv6 : NULL, port);
 509 }
 510
 511 void avahi_interface_send_packet(AvahiInterface *i, AvahiDnsPacket *p) {
 512     assert(i);
 513     assert(p);
 514
 515     avahi_interface_send_packet_unicast(i, p, NULL, 0);
 516 }
 517
 518 int avahi_interface_post_query(AvahiInterface *i, AvahiKey *key, int immediately) {
 519     assert(i);
 520     assert(key);
 521
 522     if (avahi_interface_is_relevant(i))
 523         return avahi_query_scheduler_post(i->query_scheduler, key, immediately);
 524
 525     return 0;
 526 }
 527
 528 int avahi_interface_post_response(AvahiInterface *i, AvahiRecord *record, int flush_cache, const AvahiAddress *querier, int immediately) {
 529     assert(i);
 530     assert(record);
 531
 532     if (avahi_interface_is_relevant(i))
 533         return avahi_response_scheduler_post(i->response_scheduler, record, flush_cache, querier, immediately);
 534
 535     return 0;
 536 }
 537
 538 int avahi_interface_post_probe(AvahiInterface *i, AvahiRecord *record, int immediately) {
 539     assert(i);
 540     assert(record);
 541
 542     if (avahi_interface_is_relevant(i))
 543         return avahi_probe_scheduler_post(i->probe_scheduler, record, immediately);
 544
 545     return 0;
 546 }
 547
 548 int avahi_dump_caches(AvahiInterfaceMonitor *m, AvahiDumpCallback callback, void* userdata) {
 549     AvahiInterface *i;
 550     assert(m);
 551
 552     for (i = m->interfaces; i; i = i->interface_next) {
 553         if (avahi_interface_is_relevant(i)) {
 554             char ln[256];
 555             snprintf(ln, sizeof(ln), ";;; INTERFACE %s.%s ;;;", i->hardware->name, avahi_proto_to_string(i->protocol));
 556             callback(ln, userdata);
 557             if (avahi_cache_dump(i->cache, callback, userdata) < 0)
 558                 return -1;
 559         }
 560     }
 561
 562     return 0;
 563 }
 564
 565 int avahi_interface_is_relevant(AvahiInterface *i) {
 566     AvahiInterfaceAddress *a;
 567     int relevant_address;
 568
 569     assert(i);
 570
 571     relevant_address = 0;
 572
 573     for (a = i->addresses; a; a = a->address_next)
 574         if (avahi_interface_address_is_relevant(a)) {
 575             relevant_address = 1;
 576             break;
 577         }
 578
 579     return i->hardware->flags_ok && relevant_address;
 580 }
 581
 582 int avahi_interface_address_is_relevant(AvahiInterfaceAddress *a) {
 583     AvahiInterfaceAddress *b;
 584     assert(a);
 585
 586     /* Publish public IP addresses */
 587     if (a->global_scope)
 588         return 1;
 589     else {
 590
 591         /* Publish link local IP addresses if they are the only ones on the link */
 592         for (b = a->interface->addresses; b; b = b->address_next) {
 593             if (b == a)
 594                 continue;
 595
 596             if (b->global_scope)
 597                 return 0;
 598         }
 599
 600         return 1;
 601     }
 602
 603     return 0;
 604 }
 605
 606 int avahi_interface_match(AvahiInterface *i, AvahiIfIndex idx, AvahiProtocol protocol) {
 607     assert(i);
 608
 609     if (idx != AVAHI_IF_UNSPEC && idx != i->hardware->index)
 610         return 0;
 611
 612     if (protocol != AVAHI_PROTO_UNSPEC && protocol != i->protocol)
 613         return 0;
 614
 615     return 1;
 616 }
 617
 618 void avahi_interface_monitor_walk(AvahiInterfaceMonitor *m, AvahiIfIndex interface, AvahiProtocol protocol, AvahiInterfaceMonitorWalkCallback callback, void* userdata) {
 619     assert(m);
 620     assert(callback);
 621
 622     if (interface != AVAHI_IF_UNSPEC) {
 623         if (protocol != AVAHI_PROTO_UNSPEC) {
 624             AvahiInterface *i;
 625
 626             if ((i = avahi_interface_monitor_get_interface(m, interface, protocol)))
 627                 callback(m, i, userdata);
 628
 629         } else {
 630             AvahiHwInterface *hw;
 631             AvahiInterface *i;
 632
 633             if ((hw = avahi_interface_monitor_get_hw_interface(m, interface)))
 634                 for (i = hw->interfaces; i; i = i->by_hardware_next)
 635                     if (avahi_interface_match(i, interface, protocol))
 636                         callback(m, i, userdata);
 637         }
 638
 639     } else {
 640         AvahiInterface *i;
 641
 642         for (i = m->interfaces; i; i = i->interface_next)
 643             if (avahi_interface_match(i, interface, protocol))
 644                 callback(m, i, userdata);
 645     }
 646 }
 647
 648
 649 int avahi_address_is_local(AvahiInterfaceMonitor *m, const AvahiAddress *a) {
 650     AvahiInterface *i;
 651     AvahiInterfaceAddress *ia;
 652     assert(m);
 653     assert(a);
 654
 655     for (i = m->interfaces; i; i = i->interface_next)
 656         for (ia = i->addresses; ia; ia = ia->address_next)
 657             if (avahi_address_cmp(a, &ia->address) == 0)
 658                 return 1;
 659
 660     return 0;
 661 }
 662
 663 int avahi_interface_address_on_link(AvahiInterface *i, const AvahiAddress *a) {
 664     AvahiInterfaceAddress *ia;
 665
 666     assert(i);
 667     assert(a);
 668
 669     if (a->proto != i->protocol)
 670         return 0;
 671
 672     for (ia = i->addresses; ia; ia = ia->address_next) {
 673
 674         if (a->proto == AVAHI_PROTO_INET) {
 675             uint32_t m;
 676
 677             m = ~(((uint32_t) -1) >> ia->prefix_len);
 678
 679             if ((ntohl(a->data.ipv4.address) & m) == (ntohl(ia->address.data.ipv4.address) & m))
 680                 return 1;
 681         } else {
 682             unsigned j;
 683             unsigned char pl;
 684             assert(a->proto == AVAHI_PROTO_INET6);
 685
 686             pl = ia->prefix_len;
 687
 688             for (j = 0; j < 16; j++) {
 689                 uint8_t m;
 690
 691                 if (pl == 0)
 692                     return 1;
 693
 694                 if (pl >= 8) {
 695                     m = 0xFF;
 696                     pl -= 8;
 697                 } else {
 698                     m = ~(0xFF >> pl);
 699                     pl = 0;
 700                 }
 701
 702                 if ((a->data.ipv6.address[j] & m) != (ia->address.data.ipv6.address[j] & m))
 703                     break;
 704             }
 705         }
 706     }
 707
 708     return 0;
 709 }
 710
 711 int avahi_interface_has_address(AvahiInterfaceMonitor *m, AvahiIfIndex iface, const AvahiAddress *a) {
 712     AvahiInterface *i;
 713     AvahiInterfaceAddress *j;
 714
 715     assert(m);
 716     assert(iface != AVAHI_IF_UNSPEC);
 717     assert(a);
 718
 719     if (!(i = avahi_interface_monitor_get_interface(m, iface, a->proto)))
 720         return 0;
 721
 722     for (j = i->addresses; j; j = j->address_next)
 723         if (avahi_address_cmp(a, &j->address) == 0)
 724             return 1;
 725
 726     return 0;
 727 }