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 #include <netinet/in.h>
  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 record for %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 record for %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 static int interface_mdns_mcast_join(AvahiInterface *i, int join) {
 176     char at[AVAHI_ADDRESS_STR_MAX];
 177     assert(i);
 178
 179     assert((join && !i->mcast_joined) || (!join && i->mcast_joined));
 180
 181     if (join) {
 182         AvahiInterfaceAddress *a;
 183
 184         /* Look if there's an address with global scope */
 185         for (a = i->addresses; a; a = a->address_next)
 186             if (a->global_scope)
 187                 break;
 188
 189         /* No address with a global scope has been found, so let's use
 190          * any. */
 191         if (!a)
 192             a = i->addresses;
 193
 194         /* Hmm, there is no address available. */
 195         if (!a) {
 196             avahi_log_warn(__FILE__": interface_mdns_mcast_join() called but no local address available.");
 197             return -1;
 198         }
 199
 200         i->local_mcast_address = a->address;
 201     }
 202
 203     avahi_log_info("%s mDNS multicast group on interface %s.%s with address %s.",
 204                    join ? "Joining" : "Leaving",
 205                    i->hardware->name,
 206                    avahi_proto_to_string(i->protocol),
 207                    avahi_address_snprint(at, sizeof(at), &i->local_mcast_address));
 208
 209     if (i->protocol == AVAHI_PROTO_INET6) {
 210         if (avahi_mdns_mcast_join_ipv6(i->monitor->server->fd_ipv6, &i->local_mcast_address.data.ipv6, i->hardware->index, join) < 0)
 211             return -1;
 212
 213     } else {
 214         assert(i->protocol == AVAHI_PROTO_INET);
 215
 216         if (avahi_mdns_mcast_join_ipv4(i->monitor->server->fd_ipv4, &i->local_mcast_address.data.ipv4, i->hardware->index, join) < 0)
 217             return -1;
 218     }
 219
 220     i->mcast_joined = join;
 221     return 0;
 222 }
 223
 224 static int interface_mdns_mcast_rejoin(AvahiInterface *i) {
 225     AvahiInterfaceAddress *a, *usable = NULL, *found = NULL;
 226     assert(i);
 227
 228     if (!i->mcast_joined)
 229         return 0;
 230
 231     /* Check whether old address we joined with is still available. If
 232      * not, rejoin using an other address. */
 233
 234     for (a = i->addresses; a; a = a->address_next) {
 235         if (a->global_scope && !usable)
 236             usable = a;
 237
 238         if (avahi_address_cmp(&a->address, &i->local_mcast_address) == 0) {
 239
 240             if (a->global_scope)
 241                 /* No action necessary: the address still exists and
 242                  * has global scope. */
 243                 return 0;
 244
 245             found = a;
 246         }
 247     }
 248
 249     if (found && !usable)
 250         /* No action necessary: the address still exists and no better one has been found */
 251         return 0;
 252
 253     interface_mdns_mcast_join(i, 0);
 254     return interface_mdns_mcast_join(i, 1);
 255 }
 256
 257 void avahi_interface_address_free(AvahiInterfaceAddress *a) {
 258     assert(a);
 259     assert(a->interface);
 260
 261     avahi_interface_address_update_rrs(a, 1);
 262     AVAHI_LLIST_REMOVE(AvahiInterfaceAddress, address, a->interface->addresses, a);
 263
 264     if (a->entry_group)
 265         avahi_s_entry_group_free(a->entry_group);
 266
 267     interface_mdns_mcast_rejoin(a->interface);
 268
 269     avahi_free(a);
 270 }
 271
 272 void avahi_interface_free(AvahiInterface *i, int send_goodbye) {
 273     assert(i);
 274
 275     /* Handle goodbyes and remove announcers */
 276     avahi_goodbye_interface(i->monitor->server, i, send_goodbye, 1);
 277     avahi_response_scheduler_force(i->response_scheduler);
 278     assert(!i->announcers);
 279
 280     if (i->mcast_joined)
 281         interface_mdns_mcast_join(i, 0);
 282
 283     /* Remove queriers */
 284     avahi_querier_free_all(i);
 285     avahi_hashmap_free(i->queriers_by_key);
 286
 287     /* Remove local RRs */
 288     avahi_interface_update_rrs(i, 1);
 289
 290     while (i->addresses)
 291         avahi_interface_address_free(i->addresses);
 292
 293     avahi_response_scheduler_free(i->response_scheduler);
 294     avahi_query_scheduler_free(i->query_scheduler);
 295     avahi_probe_scheduler_free(i->probe_scheduler);
 296     avahi_cache_free(i->cache);
 297
 298     AVAHI_LLIST_REMOVE(AvahiInterface, interface, i->monitor->interfaces, i);
 299     AVAHI_LLIST_REMOVE(AvahiInterface, by_hardware, i->hardware->interfaces, i);
 300
 301     avahi_free(i);
 302 }
 303
 304 void avahi_hw_interface_free(AvahiHwInterface *hw, int send_goodbye) {
 305     assert(hw);
 306
 307     avahi_hw_interface_update_rrs(hw, 1);
 308
 309     while (hw->interfaces)
 310         avahi_interface_free(hw->interfaces, send_goodbye);
 311
 312     if (hw->entry_group)
 313         avahi_s_entry_group_free(hw->entry_group);
 314
 315     AVAHI_LLIST_REMOVE(AvahiHwInterface, hardware, hw->monitor->hw_interfaces, hw);
 316     avahi_hashmap_remove(hw->monitor->hashmap, &hw->index);
 317
 318     avahi_free(hw->name);
 319     avahi_free(hw);
 320 }
 321
 322 AvahiInterface* avahi_interface_new(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, AvahiProtocol protocol) {
 323     AvahiInterface *i;
 324
 325     assert(m);
 326     assert(hw);
 327     assert(AVAHI_PROTO_VALID(protocol));
 328
 329     if (!(i = avahi_new(AvahiInterface, 1)))
 330         goto fail; /* OOM */
 331
 332     i->monitor = m;
 333     i->hardware = hw;
 334     i->protocol = protocol;
 335     i->announcing = 0;
 336     i->mcast_joined = 0;
 337
 338     AVAHI_LLIST_HEAD_INIT(AvahiInterfaceAddress, i->addresses);
 339     AVAHI_LLIST_HEAD_INIT(AvahiAnnouncer, i->announcers);
 340
 341     AVAHI_LLIST_HEAD_INIT(AvahiQuerier, i->queriers);
 342     i->queriers_by_key = avahi_hashmap_new((AvahiHashFunc) avahi_key_hash, (AvahiEqualFunc) avahi_key_equal, NULL, NULL);
 343
 344     i->cache = avahi_cache_new(m->server, i);
 345     i->response_scheduler = avahi_response_scheduler_new(i);
 346     i->query_scheduler = avahi_query_scheduler_new(i);
 347     i->probe_scheduler = avahi_probe_scheduler_new(i);
 348
 349     if (!i->cache || !i->response_scheduler || !i->query_scheduler || !i->probe_scheduler)
 350         goto fail; /* OOM */
 351
 352     AVAHI_LLIST_PREPEND(AvahiInterface, by_hardware, hw->interfaces, i);
 353     AVAHI_LLIST_PREPEND(AvahiInterface, interface, m->interfaces, i);
 354
 355     return i;
 356
 357 fail:
 358
 359     if (i) {
 360         if (i->cache)
 361             avahi_cache_free(i->cache);
 362         if (i->response_scheduler)
 363             avahi_response_scheduler_free(i->response_scheduler);
 364         if (i->query_scheduler)
 365             avahi_query_scheduler_free(i->query_scheduler);
 366         if (i->probe_scheduler)
 367             avahi_probe_scheduler_free(i->probe_scheduler);
 368     }
 369
 370     return NULL;
 371 }
 372
 373 AvahiHwInterface *avahi_hw_interface_new(AvahiInterfaceMonitor *m, AvahiIfIndex idx) {
 374     AvahiHwInterface *hw;
 375
 376     assert(m);
 377     assert(AVAHI_IF_VALID(idx));
 378
 379     if  (!(hw = avahi_new(AvahiHwInterface, 1)))
 380         return NULL;
 381
 382     hw->monitor = m;
 383     hw->name = NULL;
 384     hw->flags_ok = 0;
 385     hw->mtu = 1500;
 386     hw->index = idx;
 387     hw->mac_address_size = 0;
 388     hw->entry_group = NULL;
 389
 390     AVAHI_LLIST_HEAD_INIT(AvahiInterface, hw->interfaces);
 391     AVAHI_LLIST_PREPEND(AvahiHwInterface, hardware, m->hw_interfaces, hw);
 392
 393     avahi_hashmap_insert(m->hashmap, &hw->index, hw);
 394
 395     if (m->server->fd_ipv4 >= 0)
 396         avahi_interface_new(m, hw, AVAHI_PROTO_INET);
 397     if (m->server->fd_ipv6 >= 0)
 398         avahi_interface_new(m, hw, AVAHI_PROTO_INET6);
 399
 400     return hw;
 401 }
 402
 403 AvahiInterfaceAddress *avahi_interface_address_new(AvahiInterfaceMonitor *m, AvahiInterface *i, const AvahiAddress *addr, unsigned prefix_len) {
 404     AvahiInterfaceAddress *a;
 405
 406     assert(m);
 407     assert(i);
 408
 409     if (!(a = avahi_new(AvahiInterfaceAddress, 1)))
 410         return NULL;
 411
 412     a->interface = i;
 413     a->monitor = m;
 414     a->address = *addr;
 415     a->prefix_len = prefix_len;
 416     a->global_scope = 0;
 417     a->entry_group = NULL;
 418
 419     AVAHI_LLIST_PREPEND(AvahiInterfaceAddress, address, i->addresses, a);
 420
 421     return a;
 422 }
 423
 424 void avahi_interface_check_relevant(AvahiInterface *i) {
 425     int b;
 426     AvahiInterfaceMonitor *m;
 427
 428     assert(i);
 429     m = i->monitor;
 430
 431     b = avahi_interface_is_relevant(i);
 432
 433     if (m->list_complete && b && !i->announcing) {
 434         avahi_log_info("New relevant interface %s.%s for mDNS.", i->hardware->name, avahi_proto_to_string(i->protocol));
 435
 436         interface_mdns_mcast_join(i, 1);
 437
 438         i->announcing = 1;
 439         avahi_announce_interface(m->server, i);
 440         avahi_multicast_lookup_engine_new_interface(m->server->multicast_lookup_engine, i);
 441     } else if (!b && i->announcing) {
 442         avahi_log_info("Interface %s.%s no longer relevant for mDNS.", i->hardware->name, avahi_proto_to_string(i->protocol));
 443
 444         interface_mdns_mcast_join(i, 0);
 445
 446         avahi_goodbye_interface(m->server, i, 0, 1);
 447         avahi_querier_free_all(i);
 448
 449         avahi_response_scheduler_clear(i->response_scheduler);
 450         avahi_query_scheduler_clear(i->query_scheduler);
 451         avahi_probe_scheduler_clear(i->probe_scheduler);
 452         avahi_cache_flush(i->cache);
 453
 454         i->announcing = 0;
 455
 456     } else
 457         interface_mdns_mcast_rejoin(i);
 458 }
 459
 460 void avahi_hw_interface_check_relevant(AvahiHwInterface *hw) {
 461     AvahiInterface *i;
 462
 463     assert(hw);
 464
 465     for (i = hw->interfaces; i; i = i->by_hardware_next)
 466         avahi_interface_check_relevant(i);
 467 }
 468
 469 void avahi_interface_monitor_check_relevant(AvahiInterfaceMonitor *m) {
 470     AvahiInterface *i;
 471
 472     assert(m);
 473
 474     for (i = m->interfaces; i; i = i->interface_next)
 475         avahi_interface_check_relevant(i);
 476 }
 477
 478 AvahiInterfaceMonitor *avahi_interface_monitor_new(AvahiServer *s) {
 479     AvahiInterfaceMonitor *m = NULL;
 480
 481     if (!(m = avahi_new0(AvahiInterfaceMonitor, 1)))
 482         return NULL; /* OOM */
 483
 484     m->server = s;
 485     m->list_complete = 0;
 486     m->hashmap = avahi_hashmap_new(avahi_int_hash, avahi_int_equal, NULL, NULL);
 487
 488     AVAHI_LLIST_HEAD_INIT(AvahiInterface, m->interfaces);
 489     AVAHI_LLIST_HEAD_INIT(AvahiHwInterface, m->hw_interfaces);
 490
 491     if (avahi_interface_monitor_init_osdep(m) < 0)
 492         goto fail;
 493
 494     return m;
 495
 496 fail:
 497     avahi_interface_monitor_free(m);
 498     return NULL;
 499 }
 500
 501 void avahi_interface_monitor_free(AvahiInterfaceMonitor *m) {
 502     assert(m);
 503
 504     while (m->hw_interfaces)
 505         avahi_hw_interface_free(m->hw_interfaces, 1);
 506
 507     assert(!m->interfaces);
 508
 509     avahi_interface_monitor_free_osdep(m);
 510
 511     if (m->hashmap)
 512         avahi_hashmap_free(m->hashmap);
 513
 514     avahi_free(m);
 515 }
 516
 517
 518 AvahiInterface* avahi_interface_monitor_get_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx, AvahiProtocol protocol) {
 519     AvahiHwInterface *hw;
 520     AvahiInterface *i;
 521
 522     assert(m);
 523     assert(idx >= 0);
 524     assert(protocol != AVAHI_PROTO_UNSPEC);
 525
 526     if (!(hw = avahi_interface_monitor_get_hw_interface(m, idx)))
 527         return NULL;
 528
 529     for (i = hw->interfaces; i; i = i->by_hardware_next)
 530         if (i->protocol == protocol)
 531             return i;
 532
 533     return NULL;
 534 }
 535
 536 AvahiHwInterface* avahi_interface_monitor_get_hw_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx) {
 537     assert(m);
 538     assert(idx > 0);
 539
 540     return avahi_hashmap_lookup(m->hashmap, &idx);
 541 }
 542
 543 AvahiInterfaceAddress* avahi_interface_monitor_get_address(AvahiInterfaceMonitor *m, AvahiInterface *i, const AvahiAddress *raddr) {
 544     AvahiInterfaceAddress *ia;
 545
 546     assert(m);
 547     assert(i);
 548     assert(raddr);
 549
 550     for (ia = i->addresses; ia; ia = ia->address_next)
 551         if (avahi_address_cmp(&ia->address, raddr) == 0)
 552             return ia;
 553
 554     return NULL;
 555 }
 556
 557
 558 void avahi_interface_send_packet_unicast(AvahiInterface *i, AvahiDnsPacket *p, const AvahiAddress *a, uint16_t port) {
 559     assert(i);
 560     assert(p);
 561 /*     char t[AVAHI_ADDRESS_STR_MAX]; */
 562
 563     if (!avahi_interface_is_relevant(i))
 564         return;
 565
 566     assert(!a || a->proto == i->protocol);
 567
 568 /*     if (a) */
 569 /*         avahi_log_debug("unicast sending on '%s.%i' to %s:%u", i->hardware->name, i->protocol, avahi_address_snprint(t, sizeof(t), a), port); */
 570 /*     else */
 571 /*         avahi_log_debug("multicast sending on '%s.%i'", i->hardware->name, i->protocol); */
 572
 573     if (i->protocol == AVAHI_PROTO_INET && i->monitor->server->fd_ipv4 >= 0)
 574         avahi_send_dns_packet_ipv4(i->monitor->server->fd_ipv4, i->hardware->index, p, i->mcast_joined ? &i->local_mcast_address.data.ipv4 : NULL, a ? &a->data.ipv4 : NULL, port);
 575     else if (i->protocol == AVAHI_PROTO_INET6 && i->monitor->server->fd_ipv6 >= 0)
 576         avahi_send_dns_packet_ipv6(i->monitor->server->fd_ipv6, i->hardware->index, p, i->mcast_joined ? &i->local_mcast_address.data.ipv6 : NULL, a ? &a->data.ipv6 : NULL, port);
 577 }
 578
 579 void avahi_interface_send_packet(AvahiInterface *i, AvahiDnsPacket *p) {
 580     assert(i);
 581     assert(p);
 582
 583     avahi_interface_send_packet_unicast(i, p, NULL, 0);
 584 }
 585
 586 int avahi_interface_post_query(AvahiInterface *i, AvahiKey *key, int immediately) {
 587     assert(i);
 588     assert(key);
 589
 590     if (avahi_interface_is_relevant(i))
 591         return avahi_query_scheduler_post(i->query_scheduler, key, immediately);
 592
 593     return 0;
 594 }
 595
 596 int avahi_interface_post_response(AvahiInterface *i, AvahiRecord *record, int flush_cache, const AvahiAddress *querier, int immediately) {
 597     assert(i);
 598     assert(record);
 599
 600     if (avahi_interface_is_relevant(i))
 601         return avahi_response_scheduler_post(i->response_scheduler, record, flush_cache, querier, immediately);
 602
 603     return 0;
 604 }
 605
 606 int avahi_interface_post_probe(AvahiInterface *i, AvahiRecord *record, int immediately) {
 607     assert(i);
 608     assert(record);
 609
 610     if (avahi_interface_is_relevant(i))
 611         return avahi_probe_scheduler_post(i->probe_scheduler, record, immediately);
 612
 613     return 0;
 614 }
 615
 616 int avahi_dump_caches(AvahiInterfaceMonitor *m, AvahiDumpCallback callback, void* userdata) {
 617     AvahiInterface *i;
 618     assert(m);
 619
 620     for (i = m->interfaces; i; i = i->interface_next) {
 621         if (avahi_interface_is_relevant(i)) {
 622             char ln[256];
 623             snprintf(ln, sizeof(ln), ";;; INTERFACE %s.%s ;;;", i->hardware->name, avahi_proto_to_string(i->protocol));
 624             callback(ln, userdata);
 625             if (avahi_cache_dump(i->cache, callback, userdata) < 0)
 626                 return -1;
 627         }
 628     }
 629
 630     return 0;
 631 }
 632
 633 int avahi_interface_is_relevant(AvahiInterface *i) {
 634     AvahiInterfaceAddress *a;
 635     int relevant_address;
 636
 637     assert(i);
 638
 639     relevant_address = 0;
 640
 641     for (a = i->addresses; a; a = a->address_next)
 642         if (avahi_interface_address_is_relevant(a)) {
 643             relevant_address = 1;
 644             break;
 645         }
 646
 647     return i->hardware->flags_ok && relevant_address;
 648 }
 649
 650 int avahi_interface_address_is_relevant(AvahiInterfaceAddress *a) {
 651     AvahiInterfaceAddress *b;
 652     assert(a);
 653
 654     /* Publish public IP addresses */
 655     if (a->global_scope)
 656         return 1;
 657     else {
 658
 659         /* Publish link local IP addresses if they are the only ones on the link */
 660         for (b = a->interface->addresses; b; b = b->address_next) {
 661             if (b == a)
 662                 continue;
 663
 664             if (b->global_scope)
 665                 return 0;
 666         }
 667
 668         return 1;
 669     }
 670
 671     return 0;
 672 }
 673
 674 int avahi_interface_match(AvahiInterface *i, AvahiIfIndex idx, AvahiProtocol protocol) {
 675     assert(i);
 676
 677     if (idx != AVAHI_IF_UNSPEC && idx != i->hardware->index)
 678         return 0;
 679
 680     if (protocol != AVAHI_PROTO_UNSPEC && protocol != i->protocol)
 681         return 0;
 682
 683     return 1;
 684 }
 685
 686 void avahi_interface_monitor_walk(AvahiInterfaceMonitor *m, AvahiIfIndex interface, AvahiProtocol protocol, AvahiInterfaceMonitorWalkCallback callback, void* userdata) {
 687     assert(m);
 688     assert(callback);
 689
 690     if (interface != AVAHI_IF_UNSPEC) {
 691         if (protocol != AVAHI_PROTO_UNSPEC) {
 692             AvahiInterface *i;
 693
 694             if ((i = avahi_interface_monitor_get_interface(m, interface, protocol)))
 695                 callback(m, i, userdata);
 696
 697         } else {
 698             AvahiHwInterface *hw;
 699             AvahiInterface *i;
 700
 701             if ((hw = avahi_interface_monitor_get_hw_interface(m, interface)))
 702                 for (i = hw->interfaces; i; i = i->by_hardware_next)
 703                     if (avahi_interface_match(i, interface, protocol))
 704                         callback(m, i, userdata);
 705         }
 706
 707     } else {
 708         AvahiInterface *i;
 709
 710         for (i = m->interfaces; i; i = i->interface_next)
 711             if (avahi_interface_match(i, interface, protocol))
 712                 callback(m, i, userdata);
 713     }
 714 }
 715
 716
 717 int avahi_address_is_local(AvahiInterfaceMonitor *m, const AvahiAddress *a) {
 718     AvahiInterface *i;
 719     AvahiInterfaceAddress *ia;
 720     assert(m);
 721     assert(a);
 722
 723     for (i = m->interfaces; i; i = i->interface_next)
 724         for (ia = i->addresses; ia; ia = ia->address_next)
 725             if (avahi_address_cmp(a, &ia->address) == 0)
 726                 return 1;
 727
 728     return 0;
 729 }
 730
 731 int avahi_interface_address_on_link(AvahiInterface *i, const AvahiAddress *a) {
 732     AvahiInterfaceAddress *ia;
 733
 734     assert(i);
 735     assert(a);
 736
 737     if (a->proto != i->protocol)
 738         return 0;
 739
 740     for (ia = i->addresses; ia; ia = ia->address_next) {
 741
 742         if (a->proto == AVAHI_PROTO_INET) {
 743             uint32_t m;
 744
 745             m = ~(((uint32_t) -1) >> ia->prefix_len);
 746
 747             if ((ntohl(a->data.ipv4.address) & m) == (ntohl(ia->address.data.ipv4.address) & m))
 748                 return 1;
 749         } else {
 750             unsigned j;
 751             unsigned char pl;
 752             assert(a->proto == AVAHI_PROTO_INET6);
 753
 754             pl = ia->prefix_len;
 755
 756             for (j = 0; j < 16; j++) {
 757                 uint8_t m;
 758
 759                 if (pl == 0)
 760                     return 1;
 761
 762                 if (pl >= 8) {
 763                     m = 0xFF;
 764                     pl -= 8;
 765                 } else {
 766                     m = ~(0xFF >> pl);
 767                     pl = 0;
 768                 }
 769
 770                 if ((a->data.ipv6.address[j] & m) != (ia->address.data.ipv6.address[j] & m))
 771                     break;
 772             }
 773         }
 774     }
 775
 776     return 0;
 777 }
 778
 779 int avahi_interface_has_address(AvahiInterfaceMonitor *m, AvahiIfIndex iface, const AvahiAddress *a) {
 780     AvahiInterface *i;
 781     AvahiInterfaceAddress *j;
 782
 783     assert(m);
 784     assert(iface != AVAHI_IF_UNSPEC);
 785     assert(a);
 786
 787     if (!(i = avahi_interface_monitor_get_interface(m, iface, a->proto)))
 788         return 0;
 789
 790     for (j = i->addresses; j; j = j->address_next)
 791         if (avahi_address_cmp(a, &j->address) == 0)
 792             return 1;
 793
 794     return 0;
 795 }
 796
 797 AvahiIfIndex avahi_find_interface_for_address(AvahiInterfaceMonitor *m, const AvahiAddress *a) {
 798     AvahiInterface *i;
 799     assert(m);
 800
 801     /* Some stupid OS don't support passing the interface index when a
 802      * packet is recieved. We have to work around that limitation by
 803      * looking for an interface that has the incoming address
 804      * attached. This is sometimes ambiguous, but we have to live with
 805      * it. */
 806
 807     for (i = m->interfaces; i; i = i->interface_next) {
 808         AvahiInterfaceAddress *ai;
 809
 810         if (i->protocol != a->proto)
 811             continue;
 812
 813         for (ai = i->addresses; ai; ai = ai->address_next)
 814             if (avahi_address_cmp(a, &ai->address) == 0)
 815                 return i->hardware->index;
 816     }
 817
 818     return AVAHI_IF_UNSPEC;
 819 }