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

   1 /***
   2   This file is part of avahi.
   3
   4   avahi is free software; you can redistribute it and/or modify it
   5   under the terms of the GNU Lesser General Public License as
   6   published by the Free Software Foundation; either version 2.1 of the
   7   License, or (at your option) any later version.
   8
   9   avahi is distributed in the hope that it will be useful, but WITHOUT
  10   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11   or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
  12   Public License for more details.
  13
  14   You should have received a copy of the GNU Lesser General Public
  15   License along with avahi; if not, write to the Free Software
  16   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  17   USA.
  18 ***/
  19
  20 #ifdef HAVE_CONFIG_H
  21 #include <config.h>
  22 #endif
  23
  24 #include <string.h>
  25 #include <errno.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <sys/types.h>
  29 #include <sys/socket.h>
  30 #include <netinet/in.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 (m->list_complete &&
  52         avahi_interface_address_is_relevant(a) &&
  53         avahi_interface_is_relevant(a->interface) &&
  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             AvahiProtocol p;
  69
  70             p = (a->interface->protocol == AVAHI_PROTO_INET && m->server->config.publish_a_on_ipv6) ||
  71                 (a->interface->protocol == AVAHI_PROTO_INET6 && m->server->config.publish_aaaa_on_ipv4) ? AVAHI_PROTO_UNSPEC : a->interface->protocol;
  72
  73             avahi_address_snprint(t, sizeof(t), &a->address);
  74             avahi_log_info("Registering new address record for %s on %s.%s.", t, a->interface->hardware->name, p == AVAHI_PROTO_UNSPEC ? "*" : avahi_proto_to_string(p));
  75
  76             if (avahi_server_add_address(m->server, a->entry_group, a->interface->hardware->index, p, 0, NULL, &a->address) < 0) {
  77                 avahi_log_warn(__FILE__": avahi_server_add_address() failed: %s", avahi_strerror(m->server->error));
  78                 avahi_s_entry_group_free(a->entry_group);
  79                 a->entry_group = NULL;
  80                 return;
  81             }
  82
  83             avahi_s_entry_group_commit(a->entry_group);
  84         }
  85     } else {
  86
  87         /* Clear the entry group */
  88
  89         if (a->entry_group && !avahi_s_entry_group_is_empty(a->entry_group)) {
  90             char t[AVAHI_ADDRESS_STR_MAX];
  91             avahi_address_snprint(t, sizeof(t), &a->address);
  92
  93             if (avahi_s_entry_group_get_state(a->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING &&
  94                 m->server->state == AVAHI_SERVER_REGISTERING)
  95                 avahi_server_decrease_host_rr_pending(m->server);
  96
  97             avahi_log_info("Withdrawing address record for %s on %s.", t, a->interface->hardware->name);
  98
  99             avahi_s_entry_group_reset(a->entry_group);
 100         }
 101     }
 102 }
 103
 104 void avahi_interface_update_rrs(AvahiInterface *i, int remove_rrs) {
 105     AvahiInterfaceAddress *a;
 106
 107     assert(i);
 108
 109     for (a = i->addresses; a; a = a->address_next)
 110         avahi_interface_address_update_rrs(a, remove_rrs);
 111 }
 112
 113 void avahi_hw_interface_update_rrs(AvahiHwInterface *hw, int remove_rrs) {
 114     AvahiInterface *i;
 115     AvahiInterfaceMonitor *m;
 116
 117     assert(hw);
 118     m = hw->monitor;
 119
 120     for (i = hw->interfaces; i; i = i->by_hardware_next)
 121         avahi_interface_update_rrs(i, remove_rrs);
 122
 123     if (m->list_complete &&
 124         !remove_rrs &&
 125         m->server->config.publish_workstation &&
 126         (m->server->state == AVAHI_SERVER_RUNNING)) {
 127
 128         if (!hw->entry_group)
 129             hw->entry_group = avahi_s_entry_group_new(m->server, avahi_host_rr_entry_group_callback, NULL);
 130
 131         if (!hw->entry_group)
 132             return; /* OOM */
 133
 134         if (avahi_s_entry_group_is_empty(hw->entry_group)) {
 135             char name[AVAHI_LABEL_MAX], unescaped[AVAHI_LABEL_MAX], mac[256];
 136             const char *p = m->server->host_name;
 137
 138             avahi_unescape_label(&p, unescaped, sizeof(unescaped));
 139             avahi_format_mac_address(mac, sizeof(mac), hw->mac_address, hw->mac_address_size);
 140             snprintf(name, sizeof(name), "%s [%s]", unescaped, mac);
 141
 142             if (avahi_server_add_service(m->server, hw->entry_group, hw->index, AVAHI_PROTO_UNSPEC, 0, name, "_workstation._tcp", NULL, NULL, 9, NULL) < 0) {
 143                 avahi_log_warn(__FILE__": avahi_server_add_service() failed: %s", avahi_strerror(m->server->error));
 144                 avahi_s_entry_group_free(hw->entry_group);
 145                 hw->entry_group = NULL;
 146             } else
 147                 avahi_s_entry_group_commit(hw->entry_group);
 148         }
 149
 150     } else {
 151
 152         if (hw->entry_group && !avahi_s_entry_group_is_empty(hw->entry_group)) {
 153
 154             if (avahi_s_entry_group_get_state(hw->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING)
 155                 avahi_server_decrease_host_rr_pending(m->server);
 156
 157             avahi_s_entry_group_reset(hw->entry_group);
 158         }
 159     }
 160 }
 161
 162 void avahi_interface_monitor_update_rrs(AvahiInterfaceMonitor *m, int remove_rrs) {
 163     AvahiHwInterface *hw;
 164
 165     assert(m);
 166
 167     for (hw = m->hw_interfaces; hw; hw = hw->hardware_next)
 168         avahi_hw_interface_update_rrs(hw, remove_rrs);
 169 }
 170
 171 static int interface_mdns_mcast_join(AvahiInterface *i, int join) {
 172     char at[AVAHI_ADDRESS_STR_MAX];
 173     int r;
 174     assert(i);
 175
 176     if (!!join  == !!i->mcast_joined)
 177         return 0;
 178
 179     if ((i->protocol == AVAHI_PROTO_INET6 && i->monitor->server->fd_ipv6 < 0) ||
 180         (i->protocol == AVAHI_PROTO_INET && i->monitor->server->fd_ipv4 < 0))
 181         return -1;
 182
 183     if (join) {
 184         AvahiInterfaceAddress *a;
 185
 186         /* Look if there's an address with global scope */
 187         for (a = i->addresses; a; a = a->address_next)
 188             if (a->global_scope)
 189                 break;
 190
 191         /* No address with a global scope has been found, so let's use
 192          * any. */
 193         if (!a)
 194             a = i->addresses;
 195
 196         /* Hmm, there is no address available. */
 197         if (!a)
 198             return -1;
 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         r = avahi_mdns_mcast_join_ipv6(i->monitor->server->fd_ipv6, &i->local_mcast_address.data.ipv6, i->hardware->index, join);
 211     else {
 212         assert(i->protocol == AVAHI_PROTO_INET);
 213
 214         r = avahi_mdns_mcast_join_ipv4(i->monitor->server->fd_ipv4, &i->local_mcast_address.data.ipv4, i->hardware->index, join);
 215     }
 216
 217     if (r < 0)
 218         i->mcast_joined = 0;
 219     else
 220         i->mcast_joined = join;
 221
 222     return 0;
 223 }
 224
 225 static int interface_mdns_mcast_rejoin(AvahiInterface *i) {
 226     AvahiInterfaceAddress *a, *usable = NULL, *found = NULL;
 227     assert(i);
 228
 229     if (!i->mcast_joined)
 230         return 0;
 231
 232     /* Check whether old address we joined with is still available. If
 233      * not, rejoin using an other address. */
 234
 235     for (a = i->addresses; a; a = a->address_next) {
 236         if (a->global_scope && !usable)
 237             usable = a;
 238
 239         if (avahi_address_cmp(&a->address, &i->local_mcast_address) == 0) {
 240
 241             if (a->global_scope)
 242                 /* No action necessary: the address still exists and
 243                  * has global scope. */
 244                 return 0;
 245
 246             found = a;
 247         }
 248     }
 249
 250     if (found && !usable)
 251         /* No action necessary: the address still exists and no better one has been found */
 252         return 0;
 253
 254     interface_mdns_mcast_join(i, 0);
 255     return interface_mdns_mcast_join(i, 1);
 256 }
 257
 258 void avahi_interface_address_free(AvahiInterfaceAddress *a) {
 259     assert(a);
 260     assert(a->interface);
 261
 262     avahi_interface_address_update_rrs(a, 1);
 263     AVAHI_LLIST_REMOVE(AvahiInterfaceAddress, address, a->interface->addresses, a);
 264
 265     if (a->entry_group)
 266         avahi_s_entry_group_free(a->entry_group);
 267
 268     interface_mdns_mcast_rejoin(a->interface);
 269
 270     avahi_free(a);
 271 }
 272
 273 void avahi_interface_free(AvahiInterface *i, int send_goodbye) {
 274     assert(i);
 275
 276     /* Handle goodbyes and remove announcers */
 277     avahi_goodbye_interface(i->monitor->server, i, send_goodbye, 1);
 278     avahi_response_scheduler_force(i->response_scheduler);
 279     assert(!i->announcers);
 280
 281     if (i->mcast_joined)
 282         interface_mdns_mcast_join(i, 0);
 283
 284     /* Remove queriers */
 285     avahi_querier_free_all(i);
 286     avahi_hashmap_free(i->queriers_by_key);
 287
 288     /* Remove local RRs */
 289     avahi_interface_update_rrs(i, 1);
 290
 291     while (i->addresses)
 292         avahi_interface_address_free(i->addresses);
 293
 294     avahi_response_scheduler_free(i->response_scheduler);
 295     avahi_query_scheduler_free(i->query_scheduler);
 296     avahi_probe_scheduler_free(i->probe_scheduler);
 297     avahi_cache_free(i->cache);
 298
 299     AVAHI_LLIST_REMOVE(AvahiInterface, interface, i->monitor->interfaces, i);
 300     AVAHI_LLIST_REMOVE(AvahiInterface, by_hardware, i->hardware->interfaces, i);
 301
 302     avahi_free(i);
 303 }
 304
 305 void avahi_hw_interface_free(AvahiHwInterface *hw, int send_goodbye) {
 306     assert(hw);
 307
 308     avahi_hw_interface_update_rrs(hw, 1);
 309
 310     while (hw->interfaces)
 311         avahi_interface_free(hw->interfaces, send_goodbye);
 312
 313     if (hw->entry_group)
 314         avahi_s_entry_group_free(hw->entry_group);
 315
 316     AVAHI_LLIST_REMOVE(AvahiHwInterface, hardware, hw->monitor->hw_interfaces, hw);
 317     avahi_hashmap_remove(hw->monitor->hashmap, &hw->index);
 318
 319     avahi_free(hw->name);
 320     avahi_free(hw);
 321 }
 322
 323 AvahiInterface* avahi_interface_new(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, AvahiProtocol protocol) {
 324     AvahiInterface *i;
 325
 326     assert(m);
 327     assert(hw);
 328     assert(AVAHI_PROTO_VALID(protocol));
 329
 330     if (!(i = avahi_new(AvahiInterface, 1)))
 331         goto fail; /* OOM */
 332
 333     i->monitor = m;
 334     i->hardware = hw;
 335     i->protocol = protocol;
 336     i->announcing = 0;
 337     i->mcast_joined = 0;
 338
 339     AVAHI_LLIST_HEAD_INIT(AvahiInterfaceAddress, i->addresses);
 340     AVAHI_LLIST_HEAD_INIT(AvahiAnnouncer, i->announcers);
 341
 342     AVAHI_LLIST_HEAD_INIT(AvahiQuerier, i->queriers);
 343     i->queriers_by_key = avahi_hashmap_new((AvahiHashFunc) avahi_key_hash, (AvahiEqualFunc) avahi_key_equal, NULL, NULL);
 344
 345     i->cache = avahi_cache_new(m->server, i);
 346     i->response_scheduler = avahi_response_scheduler_new(i);
 347     i->query_scheduler = avahi_query_scheduler_new(i);
 348     i->probe_scheduler = avahi_probe_scheduler_new(i);
 349
 350     if (!i->cache || !i->response_scheduler || !i->query_scheduler || !i->probe_scheduler)
 351         goto fail; /* OOM */
 352
 353     AVAHI_LLIST_PREPEND(AvahiInterface, by_hardware, hw->interfaces, i);
 354     AVAHI_LLIST_PREPEND(AvahiInterface, interface, m->interfaces, i);
 355
 356     return i;
 357
 358 fail:
 359
 360     if (i) {
 361         if (i->cache)
 362             avahi_cache_free(i->cache);
 363         if (i->response_scheduler)
 364             avahi_response_scheduler_free(i->response_scheduler);
 365         if (i->query_scheduler)
 366             avahi_query_scheduler_free(i->query_scheduler);
 367         if (i->probe_scheduler)
 368             avahi_probe_scheduler_free(i->probe_scheduler);
 369     }
 370
 371     return NULL;
 372 }
 373
 374 AvahiHwInterface *avahi_hw_interface_new(AvahiInterfaceMonitor *m, AvahiIfIndex idx) {
 375     AvahiHwInterface *hw;
 376
 377     assert(m);
 378     assert(AVAHI_IF_VALID(idx));
 379
 380     if  (!(hw = avahi_new(AvahiHwInterface, 1)))
 381         return NULL;
 382
 383     hw->monitor = m;
 384     hw->name = NULL;
 385     hw->flags_ok = 0;
 386     hw->mtu = 1500;
 387     hw->index = idx;
 388     hw->mac_address_size = 0;
 389     hw->entry_group = NULL;
 390
 391     AVAHI_LLIST_HEAD_INIT(AvahiInterface, hw->interfaces);
 392     AVAHI_LLIST_PREPEND(AvahiHwInterface, hardware, m->hw_interfaces, hw);
 393
 394     avahi_hashmap_insert(m->hashmap, &hw->index, hw);
 395
 396     if (m->server->fd_ipv4 >= 0 || m->server->config.publish_a_on_ipv6)
 397         avahi_interface_new(m, hw, AVAHI_PROTO_INET);
 398     if (m->server->fd_ipv6 >= 0 || m->server->config.publish_aaaa_on_ipv4)
 399         avahi_interface_new(m, hw, AVAHI_PROTO_INET6);
 400
 401     return hw;
 402 }
 403
 404 AvahiInterfaceAddress *avahi_interface_address_new(AvahiInterfaceMonitor *m, AvahiInterface *i, const AvahiAddress *addr, unsigned prefix_len) {
 405     AvahiInterfaceAddress *a;
 406
 407     assert(m);
 408     assert(i);
 409
 410     if (!(a = avahi_new(AvahiInterfaceAddress, 1)))
 411         return NULL;
 412
 413     a->interface = i;
 414     a->monitor = m;
 415     a->address = *addr;
 416     a->prefix_len = prefix_len;
 417     a->global_scope = 0;
 418     a->deprecated = 0;
 419     a->entry_group = NULL;
 420
 421     AVAHI_LLIST_PREPEND(AvahiInterfaceAddress, address, i->addresses, a);
 422
 423     return a;
 424 }
 425
 426 void avahi_interface_check_relevant(AvahiInterface *i) {
 427     int b;
 428     AvahiInterfaceMonitor *m;
 429
 430     assert(i);
 431     m = i->monitor;
 432
 433     b = avahi_interface_is_relevant(i);
 434
 435     if (m->list_complete && b && !i->announcing) {
 436         interface_mdns_mcast_join(i, 1);
 437
 438         if (i->mcast_joined) {
 439             avahi_log_info("New relevant interface %s.%s for mDNS.", i->hardware->name, avahi_proto_to_string(i->protocol));
 440
 441             i->announcing = 1;
 442             avahi_announce_interface(m->server, i);
 443             avahi_multicast_lookup_engine_new_interface(m->server->multicast_lookup_engine, i);
 444         }
 445
 446     } else if (!b && i->announcing) {
 447         avahi_log_info("Interface %s.%s no longer relevant for mDNS.", i->hardware->name, avahi_proto_to_string(i->protocol));
 448
 449         interface_mdns_mcast_join(i, 0);
 450
 451         avahi_goodbye_interface(m->server, i, 0, 1);
 452         avahi_querier_free_all(i);
 453
 454         avahi_response_scheduler_clear(i->response_scheduler);
 455         avahi_query_scheduler_clear(i->query_scheduler);
 456         avahi_probe_scheduler_clear(i->probe_scheduler);
 457         avahi_cache_flush(i->cache);
 458
 459         i->announcing = 0;
 460
 461     } else
 462         interface_mdns_mcast_rejoin(i);
 463 }
 464
 465 void avahi_hw_interface_check_relevant(AvahiHwInterface *hw) {
 466     AvahiInterface *i;
 467
 468     assert(hw);
 469
 470     for (i = hw->interfaces; i; i = i->by_hardware_next)
 471         avahi_interface_check_relevant(i);
 472 }
 473
 474 void avahi_interface_monitor_check_relevant(AvahiInterfaceMonitor *m) {
 475     AvahiInterface *i;
 476
 477     assert(m);
 478
 479     for (i = m->interfaces; i; i = i->interface_next)
 480         avahi_interface_check_relevant(i);
 481 }
 482
 483 AvahiInterfaceMonitor *avahi_interface_monitor_new(AvahiServer *s) {
 484     AvahiInterfaceMonitor *m = NULL;
 485
 486     if (!(m = avahi_new0(AvahiInterfaceMonitor, 1)))
 487         return NULL; /* OOM */
 488
 489     m->server = s;
 490     m->list_complete = 0;
 491     m->hashmap = avahi_hashmap_new(avahi_int_hash, avahi_int_equal, NULL, NULL);
 492
 493     AVAHI_LLIST_HEAD_INIT(AvahiInterface, m->interfaces);
 494     AVAHI_LLIST_HEAD_INIT(AvahiHwInterface, m->hw_interfaces);
 495
 496     if (avahi_interface_monitor_init_osdep(m) < 0)
 497         goto fail;
 498
 499     return m;
 500
 501 fail:
 502     avahi_interface_monitor_free(m);
 503     return NULL;
 504 }
 505
 506 void avahi_interface_monitor_free(AvahiInterfaceMonitor *m) {
 507     assert(m);
 508
 509     while (m->hw_interfaces)
 510         avahi_hw_interface_free(m->hw_interfaces, 1);
 511
 512     assert(!m->interfaces);
 513
 514     avahi_interface_monitor_free_osdep(m);
 515
 516     if (m->hashmap)
 517         avahi_hashmap_free(m->hashmap);
 518
 519     avahi_free(m);
 520 }
 521
 522
 523 AvahiInterface* avahi_interface_monitor_get_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx, AvahiProtocol protocol) {
 524     AvahiHwInterface *hw;
 525     AvahiInterface *i;
 526
 527     assert(m);
 528     assert(idx >= 0);
 529     assert(protocol != AVAHI_PROTO_UNSPEC);
 530
 531     if (!(hw = avahi_interface_monitor_get_hw_interface(m, idx)))
 532         return NULL;
 533
 534     for (i = hw->interfaces; i; i = i->by_hardware_next)
 535         if (i->protocol == protocol)
 536             return i;
 537
 538     return NULL;
 539 }
 540
 541 AvahiHwInterface* avahi_interface_monitor_get_hw_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx) {
 542     assert(m);
 543     assert(idx >= 0);
 544
 545     return avahi_hashmap_lookup(m->hashmap, &idx);
 546 }
 547
 548 AvahiInterfaceAddress* avahi_interface_monitor_get_address(AvahiInterfaceMonitor *m, AvahiInterface *i, const AvahiAddress *raddr) {
 549     AvahiInterfaceAddress *ia;
 550
 551     assert(m);
 552     assert(i);
 553     assert(raddr);
 554
 555     for (ia = i->addresses; ia; ia = ia->address_next)
 556         if (avahi_address_cmp(&ia->address, raddr) == 0)
 557             return ia;
 558
 559     return NULL;
 560 }
 561
 562 void avahi_interface_send_packet_unicast(AvahiInterface *i, AvahiDnsPacket *p, const AvahiAddress *a, uint16_t port) {
 563     assert(i);
 564     assert(p);
 565
 566     if (!i->announcing)
 567         return;
 568
 569     assert(!a || a->proto == i->protocol);
 570
 571     if (i->protocol == AVAHI_PROTO_INET && i->monitor->server->fd_ipv4 >= 0)
 572         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);
 573     else if (i->protocol == AVAHI_PROTO_INET6 && i->monitor->server->fd_ipv6 >= 0)
 574         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);
 575 }
 576
 577 void avahi_interface_send_packet(AvahiInterface *i, AvahiDnsPacket *p) {
 578     assert(i);
 579     assert(p);
 580
 581     avahi_interface_send_packet_unicast(i, p, NULL, 0);
 582 }
 583
 584 int avahi_interface_post_query(AvahiInterface *i, AvahiKey *key, int immediately, unsigned *ret_id) {
 585     assert(i);
 586     assert(key);
 587
 588     if (!i->announcing)
 589         return 0;
 590
 591     return avahi_query_scheduler_post(i->query_scheduler, key, immediately, ret_id);
 592 }
 593
 594 int avahi_interface_withraw_query(AvahiInterface *i, unsigned id) {
 595
 596     return avahi_query_scheduler_withdraw_by_id(i->query_scheduler, id);
 597 }
 598
 599 int avahi_interface_post_response(AvahiInterface *i, AvahiRecord *record, int flush_cache, const AvahiAddress *querier, int immediately) {
 600     assert(i);
 601     assert(record);
 602
 603     if (!i->announcing)
 604         return 0;
 605
 606     return avahi_response_scheduler_post(i->response_scheduler, record, flush_cache, querier, immediately);
 607 }
 608
 609 int avahi_interface_post_probe(AvahiInterface *i, AvahiRecord *record, int immediately) {
 610     assert(i);
 611     assert(record);
 612
 613     if (!i->announcing)
 614         return 0;
 615
 616     return avahi_probe_scheduler_post(i->probe_scheduler, record, immediately);
 617 }
 618
 619 int avahi_dump_caches(AvahiInterfaceMonitor *m, AvahiDumpCallback callback, void* userdata) {
 620     AvahiInterface *i;
 621     assert(m);
 622
 623     for (i = m->interfaces; i; i = i->interface_next) {
 624         if (avahi_interface_is_relevant(i)) {
 625             char ln[256];
 626             snprintf(ln, sizeof(ln), ";;; INTERFACE %s.%s ;;;", i->hardware->name, avahi_proto_to_string(i->protocol));
 627             callback(ln, userdata);
 628             if (avahi_cache_dump(i->cache, callback, userdata) < 0)
 629                 return -1;
 630         }
 631     }
 632
 633     return 0;
 634 }
 635
 636 static int avahi_interface_is_relevant_internal(AvahiInterface *i) {
 637     AvahiInterfaceAddress *a;
 638
 639     assert(i);
 640
 641     if (!i->hardware->flags_ok)
 642         return 0;
 643
 644     for (a = i->addresses; a; a = a->address_next)
 645         if (avahi_interface_address_is_relevant(a))
 646             return 1;
 647
 648     return 0;
 649 }
 650
 651 int avahi_interface_is_relevant(AvahiInterface *i) {
 652     AvahiStringList *l;
 653     assert(i);
 654
 655     for (l = i->monitor->server->config.deny_interfaces; l; l = l->next)
 656         if (strcasecmp((char*) l->text, i->hardware->name) == 0)
 657             return 0;
 658
 659     if (i->monitor->server->config.allow_interfaces) {
 660
 661         for (l = i->monitor->server->config.allow_interfaces; l; l = l->next)
 662             if (strcasecmp((char*) l->text, i->hardware->name) == 0)
 663                 goto good;
 664
 665         return 0;
 666     }
 667
 668 good:
 669     return avahi_interface_is_relevant_internal(i);
 670 }
 671
 672 int avahi_interface_address_is_relevant(AvahiInterfaceAddress *a) {
 673     AvahiInterfaceAddress *b;
 674     assert(a);
 675
 676     /* Publish public and non-deprecated IP addresses */
 677     if (a->global_scope && !a->deprecated)
 678         return 1;
 679
 680     /* Publish link-local and deprecated IP addresses only if they are
 681      * the only ones on the link */
 682     for (b = a->interface->addresses; b; b = b->address_next) {
 683         if (b == a)
 684             continue;
 685
 686         if (b->global_scope && !b->deprecated)
 687             return 0;
 688     }
 689
 690     return 1;
 691 }
 692
 693 int avahi_interface_match(AvahiInterface *i, AvahiIfIndex idx, AvahiProtocol protocol) {
 694     assert(i);
 695
 696     if (idx != AVAHI_IF_UNSPEC && idx != i->hardware->index)
 697         return 0;
 698
 699     if (protocol != AVAHI_PROTO_UNSPEC && protocol != i->protocol)
 700         return 0;
 701
 702     return 1;
 703 }
 704
 705 void avahi_interface_monitor_walk(AvahiInterfaceMonitor *m, AvahiIfIndex interface, AvahiProtocol protocol, AvahiInterfaceMonitorWalkCallback callback, void* userdata) {
 706     assert(m);
 707     assert(callback);
 708
 709     if (interface != AVAHI_IF_UNSPEC) {
 710         if (protocol != AVAHI_PROTO_UNSPEC) {
 711             AvahiInterface *i;
 712
 713             if ((i = avahi_interface_monitor_get_interface(m, interface, protocol)))
 714                 callback(m, i, userdata);
 715
 716         } else {
 717             AvahiHwInterface *hw;
 718             AvahiInterface *i;
 719
 720             if ((hw = avahi_interface_monitor_get_hw_interface(m, interface)))
 721                 for (i = hw->interfaces; i; i = i->by_hardware_next)
 722                     if (avahi_interface_match(i, interface, protocol))
 723                         callback(m, i, userdata);
 724         }
 725
 726     } else {
 727         AvahiInterface *i;
 728
 729         for (i = m->interfaces; i; i = i->interface_next)
 730             if (avahi_interface_match(i, interface, protocol))
 731                 callback(m, i, userdata);
 732     }
 733 }
 734
 735
 736 int avahi_address_is_local(AvahiInterfaceMonitor *m, const AvahiAddress *a) {
 737     AvahiInterface *i;
 738     AvahiInterfaceAddress *ia;
 739     assert(m);
 740     assert(a);
 741
 742     for (i = m->interfaces; i; i = i->interface_next)
 743         for (ia = i->addresses; ia; ia = ia->address_next)
 744             if (avahi_address_cmp(a, &ia->address) == 0)
 745                 return 1;
 746
 747     return 0;
 748 }
 749
 750 int avahi_interface_address_on_link(AvahiInterface *i, const AvahiAddress *a) {
 751     AvahiInterfaceAddress *ia;
 752
 753     assert(i);
 754     assert(a);
 755
 756     if (a->proto != i->protocol)
 757         return 0;
 758
 759     for (ia = i->addresses; ia; ia = ia->address_next) {
 760
 761         if (a->proto == AVAHI_PROTO_INET) {
 762             uint32_t m;
 763
 764             m = ~(((uint32_t) -1) >> ia->prefix_len);
 765
 766             if ((ntohl(a->data.ipv4.address) & m) == (ntohl(ia->address.data.ipv4.address) & m))
 767                 return 1;
 768         } else {
 769             unsigned j;
 770             unsigned char pl;
 771             assert(a->proto == AVAHI_PROTO_INET6);
 772
 773             pl = ia->prefix_len;
 774
 775             for (j = 0; j < 16; j++) {
 776                 uint8_t m;
 777
 778                 if (pl == 0)
 779                     return 1;
 780
 781                 if (pl >= 8) {
 782                     m = 0xFF;
 783                     pl -= 8;
 784                 } else {
 785                     m = ~(0xFF >> pl);
 786                     pl = 0;
 787                 }
 788
 789                 if ((a->data.ipv6.address[j] & m) != (ia->address.data.ipv6.address[j] & m))
 790                     break;
 791             }
 792         }
 793     }
 794
 795     return 0;
 796 }
 797
 798 int avahi_interface_has_address(AvahiInterfaceMonitor *m, AvahiIfIndex iface, const AvahiAddress *a) {
 799     AvahiInterface *i;
 800     AvahiInterfaceAddress *j;
 801
 802     assert(m);
 803     assert(iface != AVAHI_IF_UNSPEC);
 804     assert(a);
 805
 806     if (!(i = avahi_interface_monitor_get_interface(m, iface, a->proto)))
 807         return 0;
 808
 809     for (j = i->addresses; j; j = j->address_next)
 810         if (avahi_address_cmp(a, &j->address) == 0)
 811             return 1;
 812
 813     return 0;
 814 }
 815
 816 AvahiIfIndex avahi_find_interface_for_address(AvahiInterfaceMonitor *m, const AvahiAddress *a) {
 817     AvahiInterface *i;
 818     assert(m);
 819
 820     /* Some stupid OS don't support passing the interface index when a
 821      * packet is received. We have to work around that limitation by
 822      * looking for an interface that has the incoming address
 823      * attached. This is sometimes ambiguous, but we have to live with
 824      * it. */
 825
 826     for (i = m->interfaces; i; i = i->interface_next) {
 827         AvahiInterfaceAddress *ai;
 828
 829         if (i->protocol != a->proto)
 830             continue;
 831
 832         for (ai = i->addresses; ai; ai = ai->address_next)
 833             if (avahi_address_cmp(a, &ai->address) == 0)
 834                 return i->hardware->index;
 835     }
 836
 837     return AVAHI_IF_UNSPEC;
 838 }