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/avahi-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 avahi_log_info("Withdrawing address record for %s on %s.", t, a->interface->hardware->name); 94 95 if (avahi_s_entry_group_get_state(a->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING && 96 m->server->state == AVAHI_SERVER_REGISTERING) 97 avahi_server_decrease_host_rr_pending(m->server); 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 avahi_log_info("Withdrawing workstation service for %s.", hw->name); 155 156 if (avahi_s_entry_group_get_state(hw->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING && 157 m->server->state == AVAHI_SERVER_REGISTERING) 158 avahi_server_decrease_host_rr_pending(m->server); 159 160 avahi_s_entry_group_reset(hw->entry_group); 161 } 162 } 163 } 164 165 void avahi_interface_monitor_update_rrs(AvahiInterfaceMonitor *m, int remove_rrs) { 166 AvahiHwInterface *hw; 167 168 assert(m); 169 170 for (hw = m->hw_interfaces; hw; hw = hw->hardware_next) 171 avahi_hw_interface_update_rrs(hw, remove_rrs); 172 } 173 174 static int interface_mdns_mcast_join(AvahiInterface *i, int join) { 175 char at[AVAHI_ADDRESS_STR_MAX]; 176 int r; 177 assert(i); 178 179 if (!!join == !!i->mcast_joined) 180 return 0; 181 182 if ((i->protocol == AVAHI_PROTO_INET6 && i->monitor->server->fd_ipv6 < 0) || 183 (i->protocol == AVAHI_PROTO_INET && i->monitor->server->fd_ipv4 < 0)) 184 return -1; 185 186 if (join) { 187 AvahiInterfaceAddress *a; 188 189 /* Look if there's an address with global scope */ 190 for (a = i->addresses; a; a = a->address_next) 191 if (a->global_scope) 192 break; 193 194 /* No address with a global scope has been found, so let's use 195 * any. */ 196 if (!a) 197 a = i->addresses; 198 199 /* Hmm, there is no address available. */ 200 if (!a) 201 return -1; 202 203 i->local_mcast_address = a->address; 204 } 205 206 avahi_log_info("%s mDNS multicast group on interface %s.%s with address %s.", 207 join ? "Joining" : "Leaving", 208 i->hardware->name, 209 avahi_proto_to_string(i->protocol), 210 avahi_address_snprint(at, sizeof(at), &i->local_mcast_address)); 211 212 if (i->protocol == AVAHI_PROTO_INET6) 213 r = avahi_mdns_mcast_join_ipv6(i->monitor->server->fd_ipv6, &i->local_mcast_address.data.ipv6, i->hardware->index, join); 214 else { 215 assert(i->protocol == AVAHI_PROTO_INET); 216 217 r = avahi_mdns_mcast_join_ipv4(i->monitor->server->fd_ipv4, &i->local_mcast_address.data.ipv4, i->hardware->index, join); 218 } 219 220 if (r < 0) 221 i->mcast_joined = 0; 222 else 223 i->mcast_joined = join; 224 225 return 0; 226 } 227 228 static int interface_mdns_mcast_rejoin(AvahiInterface *i) { 229 AvahiInterfaceAddress *a, *usable = NULL, *found = NULL; 230 assert(i); 231 232 if (!i->mcast_joined) 233 return 0; 234 235 /* Check whether old address we joined with is still available. If 236 * not, rejoin using an other address. */ 237 238 for (a = i->addresses; a; a = a->address_next) { 239 if (a->global_scope && !usable) 240 usable = a; 241 242 if (avahi_address_cmp(&a->address, &i->local_mcast_address) == 0) { 243 244 if (a->global_scope) 245 /* No action necessary: the address still exists and 246 * has global scope. */ 247 return 0; 248 249 found = a; 250 } 251 } 252 253 if (found && !usable) 254 /* No action necessary: the address still exists and no better one has been found */ 255 return 0; 256 257 interface_mdns_mcast_join(i, 0); 258 return interface_mdns_mcast_join(i, 1); 259 } 260 261 void avahi_interface_address_free(AvahiInterfaceAddress *a) { 262 assert(a); 263 assert(a->interface); 264 265 avahi_interface_address_update_rrs(a, 1); 266 AVAHI_LLIST_REMOVE(AvahiInterfaceAddress, address, a->interface->addresses, a); 267 268 if (a->entry_group) 269 avahi_s_entry_group_free(a->entry_group); 270 271 interface_mdns_mcast_rejoin(a->interface); 272 273 avahi_free(a); 274 } 275 276 void avahi_interface_free(AvahiInterface *i, int send_goodbye) { 277 assert(i); 278 279 /* Handle goodbyes and remove announcers */ 280 avahi_goodbye_interface(i->monitor->server, i, send_goodbye, 1); 281 avahi_response_scheduler_force(i->response_scheduler); 282 assert(!i->announcers); 283 284 if (i->mcast_joined) 285 interface_mdns_mcast_join(i, 0); 286 287 /* Remove queriers */ 288 avahi_querier_free_all(i); 289 avahi_hashmap_free(i->queriers_by_key); 290 291 /* Remove local RRs */ 292 avahi_interface_update_rrs(i, 1); 293 294 while (i->addresses) 295 avahi_interface_address_free(i->addresses); 296 297 avahi_response_scheduler_free(i->response_scheduler); 298 avahi_query_scheduler_free(i->query_scheduler); 299 avahi_probe_scheduler_free(i->probe_scheduler); 300 avahi_cache_free(i->cache); 301 302 AVAHI_LLIST_REMOVE(AvahiInterface, interface, i->monitor->interfaces, i); 303 AVAHI_LLIST_REMOVE(AvahiInterface, by_hardware, i->hardware->interfaces, i); 304 305 avahi_free(i); 306 } 307 308 void avahi_hw_interface_free(AvahiHwInterface *hw, int send_goodbye) { 309 assert(hw); 310 311 avahi_hw_interface_update_rrs(hw, 1); 312 313 while (hw->interfaces) 314 avahi_interface_free(hw->interfaces, send_goodbye); 315 316 if (hw->entry_group) 317 avahi_s_entry_group_free(hw->entry_group); 318 319 AVAHI_LLIST_REMOVE(AvahiHwInterface, hardware, hw->monitor->hw_interfaces, hw); 320 avahi_hashmap_remove(hw->monitor->hashmap, &hw->index); 321 322 avahi_free(hw->name); 323 avahi_free(hw); 324 } 325 326 AvahiInterface* avahi_interface_new(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, AvahiProtocol protocol) { 327 AvahiInterface *i; 328 329 assert(m); 330 assert(hw); 331 assert(AVAHI_PROTO_VALID(protocol)); 332 333 if (!(i = avahi_new(AvahiInterface, 1))) 334 goto fail; /* OOM */ 335 336 i->monitor = m; 337 i->hardware = hw; 338 i->protocol = protocol; 339 i->announcing = 0; 340 i->mcast_joined = 0; 341 342 AVAHI_LLIST_HEAD_INIT(AvahiInterfaceAddress, i->addresses); 343 AVAHI_LLIST_HEAD_INIT(AvahiAnnouncer, i->announcers); 344 345 AVAHI_LLIST_HEAD_INIT(AvahiQuerier, i->queriers); 346 i->queriers_by_key = avahi_hashmap_new((AvahiHashFunc) avahi_key_hash, (AvahiEqualFunc) avahi_key_equal, NULL, NULL); 347 348 i->cache = avahi_cache_new(m->server, i); 349 i->response_scheduler = avahi_response_scheduler_new(i); 350 i->query_scheduler = avahi_query_scheduler_new(i); 351 i->probe_scheduler = avahi_probe_scheduler_new(i); 352 353 if (!i->cache || !i->response_scheduler || !i->query_scheduler || !i->probe_scheduler) 354 goto fail; /* OOM */ 355 356 AVAHI_LLIST_PREPEND(AvahiInterface, by_hardware, hw->interfaces, i); 357 AVAHI_LLIST_PREPEND(AvahiInterface, interface, m->interfaces, i); 358 359 return i; 360 361 fail: 362 363 if (i) { 364 if (i->cache) 365 avahi_cache_free(i->cache); 366 if (i->response_scheduler) 367 avahi_response_scheduler_free(i->response_scheduler); 368 if (i->query_scheduler) 369 avahi_query_scheduler_free(i->query_scheduler); 370 if (i->probe_scheduler) 371 avahi_probe_scheduler_free(i->probe_scheduler); 372 } 373 374 return NULL; 375 } 376 377 AvahiHwInterface *avahi_hw_interface_new(AvahiInterfaceMonitor *m, AvahiIfIndex idx) { 378 AvahiHwInterface *hw; 379 380 assert(m); 381 assert(AVAHI_IF_VALID(idx)); 382 383 if (!(hw = avahi_new(AvahiHwInterface, 1))) 384 return NULL; 385 386 hw->monitor = m; 387 hw->name = NULL; 388 hw->flags_ok = 0; 389 hw->mtu = 1500; 390 hw->index = idx; 391 hw->mac_address_size = 0; 392 hw->entry_group = NULL; 393 hw->ratelimit_begin.tv_sec = 0; 394 hw->ratelimit_begin.tv_usec = 0; 395 hw->ratelimit_counter = 0; 396 397 AVAHI_LLIST_HEAD_INIT(AvahiInterface, hw->interfaces); 398 AVAHI_LLIST_PREPEND(AvahiHwInterface, hardware, m->hw_interfaces, hw); 399 400 avahi_hashmap_insert(m->hashmap, &hw->index, hw); 401 402 if (m->server->fd_ipv4 >= 0 || m->server->config.publish_a_on_ipv6) 403 avahi_interface_new(m, hw, AVAHI_PROTO_INET); 404 if (m->server->fd_ipv6 >= 0 || m->server->config.publish_aaaa_on_ipv4) 405 avahi_interface_new(m, hw, AVAHI_PROTO_INET6); 406 407 return hw; 408 } 409 410 AvahiInterfaceAddress *avahi_interface_address_new(AvahiInterfaceMonitor *m, AvahiInterface *i, const AvahiAddress *addr, unsigned prefix_len) { 411 AvahiInterfaceAddress *a; 412 413 assert(m); 414 assert(i); 415 416 if (!(a = avahi_new(AvahiInterfaceAddress, 1))) 417 return NULL; 418 419 a->interface = i; 420 a->monitor = m; 421 a->address = *addr; 422 a->prefix_len = prefix_len; 423 a->global_scope = 0; 424 a->deprecated = 0; 425 a->entry_group = NULL; 426 427 AVAHI_LLIST_PREPEND(AvahiInterfaceAddress, address, i->addresses, a); 428 429 return a; 430 } 431 432 void avahi_interface_check_relevant(AvahiInterface *i) { 433 int b; 434 AvahiInterfaceMonitor *m; 435 436 assert(i); 437 m = i->monitor; 438 439 b = avahi_interface_is_relevant(i); 440 441 if (m->list_complete && b && !i->announcing) { 442 interface_mdns_mcast_join(i, 1); 443 444 if (i->mcast_joined) { 445 avahi_log_info("New relevant interface %s.%s for mDNS.", i->hardware->name, avahi_proto_to_string(i->protocol)); 446 447 i->announcing = 1; 448 avahi_announce_interface(m->server, i); 449 avahi_multicast_lookup_engine_new_interface(m->server->multicast_lookup_engine, i); 450 } 451 452 } else if (!b && i->announcing) { 453 avahi_log_info("Interface %s.%s no longer relevant for mDNS.", i->hardware->name, avahi_proto_to_string(i->protocol)); 454 455 interface_mdns_mcast_join(i, 0); 456 457 avahi_goodbye_interface(m->server, i, 0, 1); 458 avahi_querier_free_all(i); 459 460 avahi_response_scheduler_clear(i->response_scheduler); 461 avahi_query_scheduler_clear(i->query_scheduler); 462 avahi_probe_scheduler_clear(i->probe_scheduler); 463 avahi_cache_flush(i->cache); 464 465 i->announcing = 0; 466 467 } else 468 interface_mdns_mcast_rejoin(i); 469 } 470 471 void avahi_hw_interface_check_relevant(AvahiHwInterface *hw) { 472 AvahiInterface *i; 473 474 assert(hw); 475 476 for (i = hw->interfaces; i; i = i->by_hardware_next) 477 avahi_interface_check_relevant(i); 478 } 479 480 void avahi_interface_monitor_check_relevant(AvahiInterfaceMonitor *m) { 481 AvahiInterface *i; 482 483 assert(m); 484 485 for (i = m->interfaces; i; i = i->interface_next) 486 avahi_interface_check_relevant(i); 487 } 488 489 AvahiInterfaceMonitor *avahi_interface_monitor_new(AvahiServer *s) { 490 AvahiInterfaceMonitor *m = NULL; 491 492 if (!(m = avahi_new0(AvahiInterfaceMonitor, 1))) 493 return NULL; /* OOM */ 494 495 m->server = s; 496 m->list_complete = 0; 497 m->hashmap = avahi_hashmap_new(avahi_int_hash, avahi_int_equal, NULL, NULL); 498 499 AVAHI_LLIST_HEAD_INIT(AvahiInterface, m->interfaces); 500 AVAHI_LLIST_HEAD_INIT(AvahiHwInterface, m->hw_interfaces); 501 502 if (avahi_interface_monitor_init_osdep(m) < 0) 503 goto fail; 504 505 return m; 506 507 fail: 508 avahi_interface_monitor_free(m); 509 return NULL; 510 } 511 512 void avahi_interface_monitor_free(AvahiInterfaceMonitor *m) { 513 assert(m); 514 515 while (m->hw_interfaces) 516 avahi_hw_interface_free(m->hw_interfaces, 1); 517 518 assert(!m->interfaces); 519 520 avahi_interface_monitor_free_osdep(m); 521 522 if (m->hashmap) 523 avahi_hashmap_free(m->hashmap); 524 525 avahi_free(m); 526 } 527 528 529 AvahiInterface* avahi_interface_monitor_get_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx, AvahiProtocol protocol) { 530 AvahiHwInterface *hw; 531 AvahiInterface *i; 532 533 assert(m); 534 assert(idx >= 0); 535 assert(protocol != AVAHI_PROTO_UNSPEC); 536 537 if (!(hw = avahi_interface_monitor_get_hw_interface(m, idx))) 538 return NULL; 539 540 for (i = hw->interfaces; i; i = i->by_hardware_next) 541 if (i->protocol == protocol) 542 return i; 543 544 return NULL; 545 } 546 547 AvahiHwInterface* avahi_interface_monitor_get_hw_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx) { 548 assert(m); 549 assert(idx >= 0); 550 551 return avahi_hashmap_lookup(m->hashmap, &idx); 552 } 553 554 AvahiInterfaceAddress* avahi_interface_monitor_get_address(AvahiInterfaceMonitor *m, AvahiInterface *i, const AvahiAddress *raddr) { 555 AvahiInterfaceAddress *ia; 556 557 assert(m); 558 assert(i); 559 assert(raddr); 560 561 for (ia = i->addresses; ia; ia = ia->address_next) 562 if (avahi_address_cmp(&ia->address, raddr) == 0) 563 return ia; 564 565 return NULL; 566 } 567 568 void avahi_interface_send_packet_unicast(AvahiInterface *i, AvahiDnsPacket *p, const AvahiAddress *a, uint16_t port) { 569 assert(i); 570 assert(p); 571 572 if (!i->announcing) 573 return; 574 575 assert(!a || a->proto == i->protocol); 576 577 if (i->monitor->server->config.ratelimit_interval > 0) { 578 struct timeval now, end; 579 580 gettimeofday(&now, NULL); 581 582 end = i->hardware->ratelimit_begin; 583 avahi_timeval_add(&end, i->monitor->server->config.ratelimit_interval); 584 585 if (i->hardware->ratelimit_begin.tv_sec <= 0 || 586 avahi_timeval_compare(&end, &now) < 0) { 587 588 i->hardware->ratelimit_begin = now; 589 i->hardware->ratelimit_counter = 0; 590 } 591 592 if (i->hardware->ratelimit_counter > i->monitor->server->config.ratelimit_burst) 593 return; 594 595 i->hardware->ratelimit_counter++; 596 } 597 598 if (i->protocol == AVAHI_PROTO_INET && i->monitor->server->fd_ipv4 >= 0) 599 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); 600 else if (i->protocol == AVAHI_PROTO_INET6 && i->monitor->server->fd_ipv6 >= 0) 601 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); 602 } 603 604 void avahi_interface_send_packet(AvahiInterface *i, AvahiDnsPacket *p) { 605 assert(i); 606 assert(p); 607 608 avahi_interface_send_packet_unicast(i, p, NULL, 0); 609 } 610 611 int avahi_interface_post_query(AvahiInterface *i, AvahiKey *key, int immediately, unsigned *ret_id) { 612 assert(i); 613 assert(key); 614 615 if (!i->announcing) 616 return 0; 617 618 return avahi_query_scheduler_post(i->query_scheduler, key, immediately, ret_id); 619 } 620 621 int avahi_interface_withraw_query(AvahiInterface *i, unsigned id) { 622 623 return avahi_query_scheduler_withdraw_by_id(i->query_scheduler, id); 624 } 625 626 int avahi_interface_post_response(AvahiInterface *i, AvahiRecord *record, int flush_cache, const AvahiAddress *querier, int immediately) { 627 assert(i); 628 assert(record); 629 630 if (!i->announcing) 631 return 0; 632 633 return avahi_response_scheduler_post(i->response_scheduler, record, flush_cache, querier, immediately); 634 } 635 636 int avahi_interface_post_probe(AvahiInterface *i, AvahiRecord *record, int immediately) { 637 assert(i); 638 assert(record); 639 640 if (!i->announcing) 641 return 0; 642 643 return avahi_probe_scheduler_post(i->probe_scheduler, record, immediately); 644 } 645 646 int avahi_dump_caches(AvahiInterfaceMonitor *m, AvahiDumpCallback callback, void* userdata) { 647 AvahiInterface *i; 648 assert(m); 649 650 for (i = m->interfaces; i; i = i->interface_next) { 651 if (avahi_interface_is_relevant(i)) { 652 char ln[256]; 653 snprintf(ln, sizeof(ln), ";;; INTERFACE %s.%s ;;;", i->hardware->name, avahi_proto_to_string(i->protocol)); 654 callback(ln, userdata); 655 if (avahi_cache_dump(i->cache, callback, userdata) < 0) 656 return -1; 657 } 658 } 659 660 return 0; 661 } 662 663 static int avahi_interface_is_relevant_internal(AvahiInterface *i) { 664 AvahiInterfaceAddress *a; 665 666 assert(i); 667 668 if (!i->hardware->flags_ok) 669 return 0; 670 671 for (a = i->addresses; a; a = a->address_next) 672 if (avahi_interface_address_is_relevant(a)) 673 return 1; 674 675 return 0; 676 } 677 678 int avahi_interface_is_relevant(AvahiInterface *i) { 679 AvahiStringList *l; 680 assert(i); 681 682 for (l = i->monitor->server->config.deny_interfaces; l; l = l->next) 683 if (strcasecmp((char*) l->text, i->hardware->name) == 0) 684 return 0; 685 686 if (i->monitor->server->config.allow_interfaces) { 687 688 for (l = i->monitor->server->config.allow_interfaces; l; l = l->next) 689 if (strcasecmp((char*) l->text, i->hardware->name) == 0) 690 goto good; 691 692 return 0; 693 } 694 695 good: 696 return avahi_interface_is_relevant_internal(i); 697 } 698 699 int avahi_interface_address_is_relevant(AvahiInterfaceAddress *a) { 700 AvahiInterfaceAddress *b; 701 assert(a); 702 703 /* Publish public and non-deprecated IP addresses */ 704 if (a->global_scope && !a->deprecated) 705 return 1; 706 707 /* Publish link-local and deprecated IP addresses only if they are 708 * the only ones on the link */ 709 for (b = a->interface->addresses; b; b = b->address_next) { 710 if (b == a) 711 continue; 712 713 if (b->global_scope && !b->deprecated) 714 return 0; 715 } 716 717 return 1; 718 } 719 720 int avahi_interface_match(AvahiInterface *i, AvahiIfIndex idx, AvahiProtocol protocol) { 721 assert(i); 722 723 if (idx != AVAHI_IF_UNSPEC && idx != i->hardware->index) 724 return 0; 725 726 if (protocol != AVAHI_PROTO_UNSPEC && protocol != i->protocol) 727 return 0; 728 729 return 1; 730 } 731 732 void avahi_interface_monitor_walk(AvahiInterfaceMonitor *m, AvahiIfIndex interface, AvahiProtocol protocol, AvahiInterfaceMonitorWalkCallback callback, void* userdata) { 733 assert(m); 734 assert(callback); 735 736 if (interface != AVAHI_IF_UNSPEC) { 737 if (protocol != AVAHI_PROTO_UNSPEC) { 738 AvahiInterface *i; 739 740 if ((i = avahi_interface_monitor_get_interface(m, interface, protocol))) 741 callback(m, i, userdata); 742 743 } else { 744 AvahiHwInterface *hw; 745 AvahiInterface *i; 746 747 if ((hw = avahi_interface_monitor_get_hw_interface(m, interface))) 748 for (i = hw->interfaces; i; i = i->by_hardware_next) 749 if (avahi_interface_match(i, interface, protocol)) 750 callback(m, i, userdata); 751 } 752 753 } else { 754 AvahiInterface *i; 755 756 for (i = m->interfaces; i; i = i->interface_next) 757 if (avahi_interface_match(i, interface, protocol)) 758 callback(m, i, userdata); 759 } 760 } 761 762 763 int avahi_address_is_local(AvahiInterfaceMonitor *m, const AvahiAddress *a) { 764 AvahiInterface *i; 765 AvahiInterfaceAddress *ia; 766 assert(m); 767 assert(a); 768 769 for (i = m->interfaces; i; i = i->interface_next) 770 for (ia = i->addresses; ia; ia = ia->address_next) 771 if (avahi_address_cmp(a, &ia->address) == 0) 772 return 1; 773 774 return 0; 775 } 776 777 int avahi_interface_address_on_link(AvahiInterface *i, const AvahiAddress *a) { 778 AvahiInterfaceAddress *ia; 779 780 assert(i); 781 assert(a); 782 783 if (a->proto != i->protocol) 784 return 0; 785 786 for (ia = i->addresses; ia; ia = ia->address_next) { 787 788 if (a->proto == AVAHI_PROTO_INET) { 789 uint32_t m; 790 791 m = ~(((uint32_t) -1) >> ia->prefix_len); 792 793 if ((ntohl(a->data.ipv4.address) & m) == (ntohl(ia->address.data.ipv4.address) & m)) 794 return 1; 795 } else { 796 unsigned j; 797 unsigned char pl; 798 assert(a->proto == AVAHI_PROTO_INET6); 799 800 pl = ia->prefix_len; 801 802 for (j = 0; j < 16; j++) { 803 uint8_t m; 804 805 if (pl == 0) 806 return 1; 807 808 if (pl >= 8) { 809 m = 0xFF; 810 pl -= 8; 811 } else { 812 m = ~(0xFF >> pl); 813 pl = 0; 814 } 815 816 if ((a->data.ipv6.address[j] & m) != (ia->address.data.ipv6.address[j] & m)) 817 break; 818 } 819 } 820 } 821 822 return 0; 823 } 824 825 int avahi_interface_has_address(AvahiInterfaceMonitor *m, AvahiIfIndex iface, const AvahiAddress *a) { 826 AvahiInterface *i; 827 AvahiInterfaceAddress *j; 828 829 assert(m); 830 assert(iface != AVAHI_IF_UNSPEC); 831 assert(a); 832 833 if (!(i = avahi_interface_monitor_get_interface(m, iface, a->proto))) 834 return 0; 835 836 for (j = i->addresses; j; j = j->address_next) 837 if (avahi_address_cmp(a, &j->address) == 0) 838 return 1; 839 840 return 0; 841 } 842 843 AvahiIfIndex avahi_find_interface_for_address(AvahiInterfaceMonitor *m, const AvahiAddress *a) { 844 AvahiInterface *i; 845 assert(m); 846 847 /* Some stupid OS don't support passing the interface index when a 848 * packet is received. We have to work around that limitation by 849 * looking for an interface that has the incoming address 850 * attached. This is sometimes ambiguous, but we have to live with 851 * it. */ 852 853 for (i = m->interfaces; i; i = i->interface_next) { 854 AvahiInterfaceAddress *ai; 855 856 if (i->protocol != a->proto) 857 continue; 858 859 for (ai = i->addresses; ai; ai = ai->address_next) 860 if (avahi_address_cmp(a, &ai->address) == 0) 861 return i->hardware->index; 862 } 863 864 return AVAHI_IF_UNSPEC; 865 } 866
