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 <sys/types.h> 31#include <sys/socket.h> 32#include <netinet/in.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 47void avahi_interface_address_update_rrs(AvahiInterfaceAddress *a, int remove_rrs) { 48 AvahiInterfaceMonitor *m; 49 50 assert(a); 51 m = a->monitor; 52 53 if (m->list_complete && 54 avahi_interface_address_is_relevant(a) && 55 avahi_interface_is_relevant(a->interface) && 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 AvahiProtocol p; 71 72 p = (a->interface->protocol == AVAHI_PROTO_INET && m->server->config.publish_a_on_ipv6) || 73 (a->interface->protocol == AVAHI_PROTO_INET6 && m->server->config.publish_aaaa_on_ipv4) ? AVAHI_PROTO_UNSPEC : a->interface->protocol; 74 75 avahi_address_snprint(t, sizeof(t), &a->address); 76 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)); 77 78 if (avahi_server_add_address(m->server, a->entry_group, a->interface->hardware->index, p, 0, NULL, &a->address) < 0) { 79 avahi_log_warn(__FILE__": avahi_server_add_address() failed: %s", avahi_strerror(m->server->error)); 80 avahi_s_entry_group_free(a->entry_group); 81 a->entry_group = NULL; 82 return; 83 } 84 85 avahi_s_entry_group_commit(a->entry_group); 86 } 87 } else { 88 89 /* Clear the entry group */ 90 91 if (a->entry_group && !avahi_s_entry_group_is_empty(a->entry_group)) { 92 char t[AVAHI_ADDRESS_STR_MAX]; 93 avahi_address_snprint(t, sizeof(t), &a->address); 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_log_info("Withdrawing address record for %s on %s.", t, a->interface->hardware->name); 100 101 avahi_s_entry_group_reset(a->entry_group); 102 } 103 } 104} 105 106void avahi_interface_update_rrs(AvahiInterface *i, int remove_rrs) { 107 AvahiInterfaceAddress *a; 108 109 assert(i); 110 111 for (a = i->addresses; a; a = a->address_next) 112 avahi_interface_address_update_rrs(a, remove_rrs); 113} 114 115void avahi_hw_interface_update_rrs(AvahiHwInterface *hw, int remove_rrs) { 116 AvahiInterface *i; 117 AvahiInterfaceMonitor *m; 118 119 assert(hw); 120 m = hw->monitor; 121 122 for (i = hw->interfaces; i; i = i->by_hardware_next) 123 avahi_interface_update_rrs(i, remove_rrs); 124 125 if (m->list_complete && 126 !remove_rrs && 127 m->server->config.publish_workstation && 128 (m->server->state == AVAHI_SERVER_RUNNING)) { 129 130 if (!hw->entry_group) 131 hw->entry_group = avahi_s_entry_group_new(m->server, avahi_host_rr_entry_group_callback, NULL); 132 133 if (!hw->entry_group) 134 return; /* OOM */ 135 136 if (avahi_s_entry_group_is_empty(hw->entry_group)) { 137 char name[AVAHI_LABEL_MAX], mac[256]; 138 139 avahi_format_mac_address(mac, sizeof(mac), hw->mac_address, hw->mac_address_size); 140 snprintf(name, sizeof(name), "%s [%s]", m->server->host_name, 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 162void 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 171static 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 225static 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 258void 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 273void 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 305void 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 323AvahiInterface* 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 358fail: 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 374AvahiHwInterface *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 404AvahiInterfaceAddress *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->entry_group = NULL; 419 420 AVAHI_LLIST_PREPEND(AvahiInterfaceAddress, address, i->addresses, a); 421 422 return a; 423} 424 425void avahi_interface_check_relevant(AvahiInterface *i) { 426 int b; 427 AvahiInterfaceMonitor *m; 428 429 assert(i); 430 m = i->monitor; 431 432 b = avahi_interface_is_relevant(i); 433 434 if (m->list_complete && b && !i->announcing) { 435 interface_mdns_mcast_join(i, 1); 436 437 if (i->mcast_joined) { 438 avahi_log_info("New relevant interface %s.%s for mDNS.", i->hardware->name, avahi_proto_to_string(i->protocol)); 439 440 i->announcing = 1; 441 avahi_announce_interface(m->server, i); 442 avahi_multicast_lookup_engine_new_interface(m->server->multicast_lookup_engine, i); 443 } 444 445 } else if (!b && i->announcing) { 446 avahi_log_info("Interface %s.%s no longer relevant for mDNS.", i->hardware->name, avahi_proto_to_string(i->protocol)); 447 448 interface_mdns_mcast_join(i, 0); 449 450 avahi_goodbye_interface(m->server, i, 0, 1); 451 avahi_querier_free_all(i); 452 453 avahi_response_scheduler_clear(i->response_scheduler); 454 avahi_query_scheduler_clear(i->query_scheduler); 455 avahi_probe_scheduler_clear(i->probe_scheduler); 456 avahi_cache_flush(i->cache); 457 458 i->announcing = 0; 459 460 } else 461 interface_mdns_mcast_rejoin(i); 462} 463 464void avahi_hw_interface_check_relevant(AvahiHwInterface *hw) { 465 AvahiInterface *i; 466 467 assert(hw); 468 469 for (i = hw->interfaces; i; i = i->by_hardware_next) 470 avahi_interface_check_relevant(i); 471} 472 473void avahi_interface_monitor_check_relevant(AvahiInterfaceMonitor *m) { 474 AvahiInterface *i; 475 476 assert(m); 477 478 for (i = m->interfaces; i; i = i->interface_next) 479 avahi_interface_check_relevant(i); 480} 481 482AvahiInterfaceMonitor *avahi_interface_monitor_new(AvahiServer *s) { 483 AvahiInterfaceMonitor *m = NULL; 484 485 if (!(m = avahi_new0(AvahiInterfaceMonitor, 1))) 486 return NULL; /* OOM */ 487 488 m->server = s; 489 m->list_complete = 0; 490 m->hashmap = avahi_hashmap_new(avahi_int_hash, avahi_int_equal, NULL, NULL); 491 492 AVAHI_LLIST_HEAD_INIT(AvahiInterface, m->interfaces); 493 AVAHI_LLIST_HEAD_INIT(AvahiHwInterface, m->hw_interfaces); 494 495 if (avahi_interface_monitor_init_osdep(m) < 0) 496 goto fail; 497 498 return m; 499 500fail: 501 avahi_interface_monitor_free(m); 502 return NULL; 503} 504 505void avahi_interface_monitor_free(AvahiInterfaceMonitor *m) { 506 assert(m); 507 508 while (m->hw_interfaces) 509 avahi_hw_interface_free(m->hw_interfaces, 1); 510 511 assert(!m->interfaces); 512 513 avahi_interface_monitor_free_osdep(m); 514 515 if (m->hashmap) 516 avahi_hashmap_free(m->hashmap); 517 518 avahi_free(m); 519} 520 521 522AvahiInterface* avahi_interface_monitor_get_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx, AvahiProtocol protocol) { 523 AvahiHwInterface *hw; 524 AvahiInterface *i; 525 526 assert(m); 527 assert(idx >= 0); 528 assert(protocol != AVAHI_PROTO_UNSPEC); 529 530 if (!(hw = avahi_interface_monitor_get_hw_interface(m, idx))) 531 return NULL; 532 533 for (i = hw->interfaces; i; i = i->by_hardware_next) 534 if (i->protocol == protocol) 535 return i; 536 537 return NULL; 538} 539 540AvahiHwInterface* avahi_interface_monitor_get_hw_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx) { 541 assert(m); 542 assert(idx >= 0); 543 544 return avahi_hashmap_lookup(m->hashmap, &idx); 545} 546 547AvahiInterfaceAddress* avahi_interface_monitor_get_address(AvahiInterfaceMonitor *m, AvahiInterface *i, const AvahiAddress *raddr) { 548 AvahiInterfaceAddress *ia; 549 550 assert(m); 551 assert(i); 552 assert(raddr); 553 554 for (ia = i->addresses; ia; ia = ia->address_next) 555 if (avahi_address_cmp(&ia->address, raddr) == 0) 556 return ia; 557 558 return NULL; 559} 560 561void avahi_interface_send_packet_unicast(AvahiInterface *i, AvahiDnsPacket *p, const AvahiAddress *a, uint16_t port) { 562 assert(i); 563 assert(p); 564 565 if (!i->announcing) 566 return; 567 568 assert(!a || a->proto == i->protocol); 569 570 if (i->protocol == AVAHI_PROTO_INET && i->monitor->server->fd_ipv4 >= 0) 571 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); 572 else if (i->protocol == AVAHI_PROTO_INET6 && i->monitor->server->fd_ipv6 >= 0) 573 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); 574} 575 576void avahi_interface_send_packet(AvahiInterface *i, AvahiDnsPacket *p) { 577 assert(i); 578 assert(p); 579 580 avahi_interface_send_packet_unicast(i, p, NULL, 0); 581} 582 583int avahi_interface_post_query(AvahiInterface *i, AvahiKey *key, int immediately, unsigned *ret_id) { 584 assert(i); 585 assert(key); 586 587 if (!i->announcing) 588 return 0; 589 590 return avahi_query_scheduler_post(i->query_scheduler, key, immediately, ret_id); 591} 592 593int avahi_interface_withraw_query(AvahiInterface *i, unsigned id) { 594 595 return avahi_query_scheduler_withdraw_by_id(i->query_scheduler, id); 596} 597 598int avahi_interface_post_response(AvahiInterface *i, AvahiRecord *record, int flush_cache, const AvahiAddress *querier, int immediately) { 599 assert(i); 600 assert(record); 601 602 if (!i->announcing) 603 return 0; 604 605 return avahi_response_scheduler_post(i->response_scheduler, record, flush_cache, querier, immediately); 606} 607 608int avahi_interface_post_probe(AvahiInterface *i, AvahiRecord *record, int immediately) { 609 assert(i); 610 assert(record); 611 612 if (!i->announcing) 613 return 0; 614 615 return avahi_probe_scheduler_post(i->probe_scheduler, record, immediately); 616} 617 618int avahi_dump_caches(AvahiInterfaceMonitor *m, AvahiDumpCallback callback, void* userdata) { 619 AvahiInterface *i; 620 assert(m); 621 622 for (i = m->interfaces; i; i = i->interface_next) { 623 if (avahi_interface_is_relevant(i)) { 624 char ln[256]; 625 snprintf(ln, sizeof(ln), ";;; INTERFACE %s.%s ;;;", i->hardware->name, avahi_proto_to_string(i->protocol)); 626 callback(ln, userdata); 627 if (avahi_cache_dump(i->cache, callback, userdata) < 0) 628 return -1; 629 } 630 } 631 632 return 0; 633} 634 635static int avahi_interface_is_relevant_internal(AvahiInterface *i) { 636 AvahiInterfaceAddress *a; 637 638 assert(i); 639 640 if (!i->hardware->flags_ok) 641 return 0; 642 643 for (a = i->addresses; a; a = a->address_next) 644 if (avahi_interface_address_is_relevant(a)) 645 return 1; 646 647 return 0; 648} 649 650int avahi_interface_is_relevant(AvahiInterface *i) { 651 AvahiStringList *l; 652 assert(i); 653 654 for (l = i->monitor->server->config.deny_interfaces; l; l = l->next) 655 if (strcasecmp((char*) l->text, i->hardware->name) == 0) 656 return 0; 657 658 if (i->monitor->server->config.allow_interfaces) { 659 660 for (l = i->monitor->server->config.allow_interfaces; l; l = l->next) 661 if (strcasecmp((char*) l->text, i->hardware->name) == 0) 662 goto good; 663 664 return 0; 665 } 666 667good: 668 return avahi_interface_is_relevant_internal(i); 669} 670 671int avahi_interface_address_is_relevant(AvahiInterfaceAddress *a) { 672 AvahiInterfaceAddress *b; 673 assert(a); 674 675 /* Publish public IP addresses */ 676 if (a->global_scope) 677 return 1; 678 else { 679 680 /* Publish link local IP addresses if they are the only ones on the link */ 681 for (b = a->interface->addresses; b; b = b->address_next) { 682 if (b == a) 683 continue; 684 685 if (b->global_scope) 686 return 0; 687 } 688 689 return 1; 690 } 691 692 return 0; 693} 694 695int avahi_interface_match(AvahiInterface *i, AvahiIfIndex idx, AvahiProtocol protocol) { 696 assert(i); 697 698 if (idx != AVAHI_IF_UNSPEC && idx != i->hardware->index) 699 return 0; 700 701 if (protocol != AVAHI_PROTO_UNSPEC && protocol != i->protocol) 702 return 0; 703 704 return 1; 705} 706 707void avahi_interface_monitor_walk(AvahiInterfaceMonitor *m, AvahiIfIndex interface, AvahiProtocol protocol, AvahiInterfaceMonitorWalkCallback callback, void* userdata) { 708 assert(m); 709 assert(callback); 710 711 if (interface != AVAHI_IF_UNSPEC) { 712 if (protocol != AVAHI_PROTO_UNSPEC) { 713 AvahiInterface *i; 714 715 if ((i = avahi_interface_monitor_get_interface(m, interface, protocol))) 716 callback(m, i, userdata); 717 718 } else { 719 AvahiHwInterface *hw; 720 AvahiInterface *i; 721 722 if ((hw = avahi_interface_monitor_get_hw_interface(m, interface))) 723 for (i = hw->interfaces; i; i = i->by_hardware_next) 724 if (avahi_interface_match(i, interface, protocol)) 725 callback(m, i, userdata); 726 } 727 728 } else { 729 AvahiInterface *i; 730 731 for (i = m->interfaces; i; i = i->interface_next) 732 if (avahi_interface_match(i, interface, protocol)) 733 callback(m, i, userdata); 734 } 735} 736 737 738int avahi_address_is_local(AvahiInterfaceMonitor *m, const AvahiAddress *a) { 739 AvahiInterface *i; 740 AvahiInterfaceAddress *ia; 741 assert(m); 742 assert(a); 743 744 for (i = m->interfaces; i; i = i->interface_next) 745 for (ia = i->addresses; ia; ia = ia->address_next) 746 if (avahi_address_cmp(a, &ia->address) == 0) 747 return 1; 748 749 return 0; 750} 751 752int avahi_interface_address_on_link(AvahiInterface *i, const AvahiAddress *a) { 753 AvahiInterfaceAddress *ia; 754 755 assert(i); 756 assert(a); 757 758 if (a->proto != i->protocol) 759 return 0; 760 761 for (ia = i->addresses; ia; ia = ia->address_next) { 762 763 if (a->proto == AVAHI_PROTO_INET) { 764 uint32_t m; 765 766 m = ~(((uint32_t) -1) >> ia->prefix_len); 767 768 if ((ntohl(a->data.ipv4.address) & m) == (ntohl(ia->address.data.ipv4.address) & m)) 769 return 1; 770 } else { 771 unsigned j; 772 unsigned char pl; 773 assert(a->proto == AVAHI_PROTO_INET6); 774 775 pl = ia->prefix_len; 776 777 for (j = 0; j < 16; j++) { 778 uint8_t m; 779 780 if (pl == 0) 781 return 1; 782 783 if (pl >= 8) { 784 m = 0xFF; 785 pl -= 8; 786 } else { 787 m = ~(0xFF >> pl); 788 pl = 0; 789 } 790 791 if ((a->data.ipv6.address[j] & m) != (ia->address.data.ipv6.address[j] & m)) 792 break; 793 } 794 } 795 } 796 797 return 0; 798} 799 800int avahi_interface_has_address(AvahiInterfaceMonitor *m, AvahiIfIndex iface, const AvahiAddress *a) { 801 AvahiInterface *i; 802 AvahiInterfaceAddress *j; 803 804 assert(m); 805 assert(iface != AVAHI_IF_UNSPEC); 806 assert(a); 807 808 if (!(i = avahi_interface_monitor_get_interface(m, iface, a->proto))) 809 return 0; 810 811 for (j = i->addresses; j; j = j->address_next) 812 if (avahi_address_cmp(a, &j->address) == 0) 813 return 1; 814 815 return 0; 816} 817 818AvahiIfIndex avahi_find_interface_for_address(AvahiInterfaceMonitor *m, const AvahiAddress *a) { 819 AvahiInterface *i; 820 assert(m); 821 822 /* Some stupid OS don't support passing the interface index when a 823 * packet is received. We have to work around that limitation by 824 * looking for an interface that has the incoming address 825 * attached. This is sometimes ambiguous, but we have to live with 826 * it. */ 827 828 for (i = m->interfaces; i; i = i->interface_next) { 829 AvahiInterfaceAddress *ai; 830 831 if (i->protocol != a->proto) 832 continue; 833 834 for (ai = i->addresses; ai; ai = ai->address_next) 835 if (avahi_address_cmp(a, &ai->address) == 0) 836 return i->hardware->index; 837 } 838 839 return AVAHI_IF_UNSPEC; 840} 841