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

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of avahi.
   5
   6   avahi is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as
   8   published by the Free Software Foundation; either version 2.1 of the
   9   License, or (at your option) any later version.
  10
  11   avahi is distributed in the hope that it will be useful, but WITHOUT
  12   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13   or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
  14   Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public
  17   License along with avahi; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <string.h>
  27 #include <sys/socket.h>
  28 #include <asm/types.h>
  29 #include <linux/netlink.h>
  30 #include <linux/rtnetlink.h>
  31 #include <errno.h>
  32 #include <net/if.h>
  33 #include <stdio.h>
  34
  35 #include <avahi-common/error.h>
  36 #include <avahi-common/malloc.h>
  37
  38 #include "iface.h"
  39 #include "netlink.h"
  40 #include "dns.h"
  41 #include "socket.h"
  42 #include "announce.h"
  43 #include "util.h"
  44 #include "log.h"
  45 #include "multicast-lookup.h"
  46 #include "querier.h"
  47
  48 static void update_address_rr(AvahiInterfaceMonitor *m, AvahiInterfaceAddress *a, int remove_rrs) {
  49     assert(m);
  50     assert(a);
  51
  52     if (a->interface->announcing &&
  53         m->list == LIST_DONE &&
  54         avahi_interface_address_relevant(a) &&
  55         !remove_rrs &&
  56         m->server->config.publish_addresses &&
  57         (m->server->state == AVAHI_SERVER_RUNNING ||
  58         m->server->state == AVAHI_SERVER_REGISTERING)) {
  59
  60         /* Fill the entry group */
  61         if (!a->entry_group)
  62             a->entry_group = avahi_s_entry_group_new(m->server, avahi_host_rr_entry_group_callback, NULL);
  63
  64         if (!a->entry_group) /* OOM */
  65             return;
  66
  67         if (avahi_s_entry_group_is_empty(a->entry_group)) {
  68             char t[64];
  69             avahi_address_snprint(t, sizeof(t), &a->address);
  70
  71             avahi_log_info("Registering new address %s on %s.", t, a->interface->hardware->name);
  72
  73             if (avahi_server_add_address(m->server, a->entry_group, a->interface->hardware->index, a->interface->protocol, 0, NULL, &a->address) < 0) {
  74                 avahi_log_warn(__FILE__": avahi_server_add_address() failed: %s", avahi_strerror(m->server->error));
  75                 avahi_s_entry_group_free(a->entry_group);
  76                 a->entry_group = NULL;
  77                 return;
  78             }
  79
  80             avahi_s_entry_group_commit(a->entry_group);
  81         }
  82     } else {
  83
  84         /* Clear the entry group */
  85
  86         if (a->entry_group && !avahi_s_entry_group_is_empty(a->entry_group)) {
  87             char t[64];
  88             avahi_address_snprint(t, sizeof(t), &a->address);
  89
  90             if (avahi_s_entry_group_get_state(a->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING &&
  91                 m->server->state == AVAHI_SERVER_REGISTERING)
  92                 avahi_server_decrease_host_rr_pending(m->server);
  93
  94             avahi_log_info("Withdrawing address %s on %s.", t, a->interface->hardware->name);
  95
  96             avahi_s_entry_group_reset(a->entry_group);
  97         }
  98     }
  99 }
 100
 101 static void update_interface_rr(AvahiInterfaceMonitor *m, AvahiInterface *i, int remove_rrs) {
 102     AvahiInterfaceAddress *a;
 103
 104     assert(m);
 105     assert(i);
 106
 107     for (a = i->addresses; a; a = a->address_next)
 108         update_address_rr(m, a, remove_rrs);
 109 }
 110
 111 static void update_hw_interface_rr(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, int remove_rrs) {
 112     AvahiInterface *i;
 113
 114     assert(m);
 115     assert(hw);
 116
 117     for (i = hw->interfaces; i; i = i->by_hardware_next)
 118         update_interface_rr(m, i, remove_rrs);
 119
 120     if (m->list == LIST_DONE &&
 121         !remove_rrs &&
 122         m->server->config.publish_workstation &&
 123         (m->server->state == AVAHI_SERVER_RUNNING ||
 124         m->server->state == AVAHI_SERVER_REGISTERING)) {
 125
 126         if (!hw->entry_group)
 127             hw->entry_group = avahi_s_entry_group_new(m->server, avahi_host_rr_entry_group_callback, NULL);
 128
 129         if (!hw->entry_group)
 130             return; /* OOM */
 131
 132         if (avahi_s_entry_group_is_empty(hw->entry_group)) {
 133             char *name;
 134             char *t;
 135
 136             if (!(t = avahi_format_mac_address(hw->mac_address, hw->mac_address_size)))
 137                 return; /* OOM */
 138
 139             name = avahi_strdup_printf("%s [%s]", m->server->host_name, t);
 140             avahi_free(t);
 141
 142             if (!name)
 143                 return; /* OOM */
 144
 145             if (avahi_server_add_service(m->server, hw->entry_group, hw->index, AVAHI_PROTO_UNSPEC, name, "_workstation._tcp", NULL, NULL, 9, NULL) < 0) {
 146                 avahi_log_warn(__FILE__": avahi_server_add_service() failed.");
 147                 avahi_s_entry_group_free(hw->entry_group);
 148                 hw->entry_group = NULL;
 149             } else
 150                 avahi_s_entry_group_commit(hw->entry_group);
 151
 152             avahi_free(name);
 153         }
 154
 155     } else {
 156
 157         if (hw->entry_group && !avahi_s_entry_group_is_empty(hw->entry_group)) {
 158
 159             if (avahi_s_entry_group_get_state(hw->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING)
 160                 avahi_server_decrease_host_rr_pending(m->server);
 161
 162             avahi_s_entry_group_reset(hw->entry_group);
 163         }
 164     }
 165 }
 166
 167 static void free_address(AvahiInterfaceMonitor *m, AvahiInterfaceAddress *a) {
 168     assert(m);
 169     assert(a);
 170     assert(a->interface);
 171
 172     update_address_rr(m, a, 1);
 173     AVAHI_LLIST_REMOVE(AvahiInterfaceAddress, address, a->interface->addresses, a);
 174
 175     if (a->entry_group)
 176         avahi_s_entry_group_free(a->entry_group);
 177
 178     avahi_free(a);
 179 }
 180
 181 static void free_interface(AvahiInterfaceMonitor *m, AvahiInterface *i, int send_goodbye) {
 182     assert(m);
 183     assert(i);
 184
 185     /* Handle goodbyes and remove announcers */
 186     avahi_goodbye_interface(m->server, i, send_goodbye);
 187     avahi_response_scheduler_force(i->response_scheduler);
 188     assert(!i->announcements);
 189
 190     /* Remove queriers */
 191     avahi_querier_free_all(i);
 192     avahi_hashmap_free(i->queriers_by_key);
 193
 194     /* Remove local RRs */
 195     update_interface_rr(m, i, 1);
 196
 197     while (i->addresses)
 198         free_address(m, i->addresses);
 199
 200     avahi_response_scheduler_free(i->response_scheduler);
 201     avahi_query_scheduler_free(i->query_scheduler);
 202     avahi_probe_scheduler_free(i->probe_scheduler);
 203     avahi_cache_free(i->cache);
 204
 205     AVAHI_LLIST_REMOVE(AvahiInterface, interface, m->interfaces, i);
 206     AVAHI_LLIST_REMOVE(AvahiInterface, by_hardware, i->hardware->interfaces, i);
 207
 208     avahi_free(i);
 209 }
 210
 211 static void free_hw_interface(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, int send_goodbye) {
 212     assert(m);
 213     assert(hw);
 214
 215     update_hw_interface_rr(m, hw, 1);
 216
 217     while (hw->interfaces)
 218         free_interface(m, hw->interfaces, send_goodbye);
 219
 220     if (hw->entry_group)
 221         avahi_s_entry_group_free(hw->entry_group);
 222
 223     AVAHI_LLIST_REMOVE(AvahiHwInterface, hardware, m->hw_interfaces, hw);
 224     avahi_hashmap_remove(m->hashmap, &hw->index);
 225
 226     avahi_free(hw->name);
 227     avahi_free(hw);
 228 }
 229
 230 static AvahiInterfaceAddress* get_address(AvahiInterfaceMonitor *m, AvahiInterface *i, const AvahiAddress *raddr) {
 231     AvahiInterfaceAddress *ia;
 232
 233     assert(m);
 234     assert(i);
 235     assert(raddr);
 236
 237     for (ia = i->addresses; ia; ia = ia->address_next)
 238         if (avahi_address_cmp(&ia->address, raddr) == 0)
 239             return ia;
 240
 241     return NULL;
 242 }
 243
 244 static int netlink_list_items(AvahiNetlink *nl, uint16_t type, unsigned *ret_seq) {
 245     struct nlmsghdr *n;
 246     struct rtgenmsg *gen;
 247     uint8_t req[1024];
 248
 249     memset(&req, 0, sizeof(req));
 250     n = (struct nlmsghdr*) req;
 251     n->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg));
 252     n->nlmsg_type = type;
 253     n->nlmsg_flags = NLM_F_ROOT|NLM_F_REQUEST;
 254     n->nlmsg_pid = 0;
 255
 256     gen = NLMSG_DATA(n);
 257     memset(gen, 0, sizeof(struct rtgenmsg));
 258     gen->rtgen_family = AF_UNSPEC;
 259
 260     return avahi_netlink_send(nl, n, ret_seq);
 261 }
 262
 263 static void new_interface(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, AvahiProtocol protocol) {
 264     AvahiInterface *i;
 265
 266     assert(m);
 267     assert(hw);
 268     assert(protocol != AVAHI_PROTO_UNSPEC);
 269
 270     if (!(i = avahi_new(AvahiInterface, 1)))
 271         goto fail; /* OOM */
 272
 273     i->monitor = m;
 274     i->hardware = hw;
 275     i->protocol = protocol;
 276     i->announcing = 0;
 277
 278     AVAHI_LLIST_HEAD_INIT(AvahiInterfaceAddress, i->addresses);
 279     AVAHI_LLIST_HEAD_INIT(AvahiAnnouncement, i->announcements);
 280
 281     AVAHI_LLIST_HEAD_INIT(AvahiQuerier, i->queriers);
 282     i->queriers_by_key = avahi_hashmap_new((AvahiHashFunc) avahi_key_hash, (AvahiEqualFunc) avahi_key_equal, NULL, NULL);
 283
 284     i->cache = avahi_cache_new(m->server, i);
 285     i->response_scheduler = avahi_response_scheduler_new(i);
 286     i->query_scheduler = avahi_query_scheduler_new(i);
 287     i->probe_scheduler = avahi_probe_scheduler_new(i);
 288
 289     if (!i->cache || !i->response_scheduler || !i->query_scheduler || !i->probe_scheduler)
 290         goto fail; /* OOM */
 291
 292     AVAHI_LLIST_PREPEND(AvahiInterface, by_hardware, hw->interfaces, i);
 293     AVAHI_LLIST_PREPEND(AvahiInterface, interface, m->interfaces, i);
 294
 295     return;
 296 fail:
 297
 298     if (i) {
 299         if (i->cache)
 300             avahi_cache_free(i->cache);
 301         if (i->response_scheduler)
 302             avahi_response_scheduler_free(i->response_scheduler);
 303         if (i->query_scheduler)
 304             avahi_query_scheduler_free(i->query_scheduler);
 305         if (i->probe_scheduler)
 306             avahi_probe_scheduler_free(i->probe_scheduler);
 307     }
 308
 309 }
 310
 311 static void check_interface_relevant(AvahiInterfaceMonitor *m, AvahiInterface *i) {
 312     int b;
 313
 314     assert(m);
 315     assert(i);
 316
 317     b = avahi_interface_relevant(i);
 318
 319     if (m->list == LIST_DONE && b && !i->announcing) {
 320         avahi_log_info("New relevant interface %s.%s.", i->hardware->name, avahi_proto_to_string(i->protocol));
 321
 322         if (i->protocol == AVAHI_PROTO_INET)
 323             avahi_mdns_mcast_join_ipv4(m->server->fd_ipv4, i->hardware->index);
 324         if (i->protocol == AVAHI_PROTO_INET6)
 325             avahi_mdns_mcast_join_ipv6(m->server->fd_ipv6, i->hardware->index);
 326
 327         i->announcing = 1;
 328         avahi_announce_interface(m->server, i);
 329         avahi_multicast_lookup_engine_new_interface(m->server->multicast_lookup_engine, i);
 330     } else if (!b && i->announcing) {
 331         avahi_log_info("Interface %s.%s no longer relevant.", i->hardware->name, avahi_proto_to_string(i->protocol));
 332
 333         if (i->protocol == AVAHI_PROTO_INET)
 334             avahi_mdns_mcast_leave_ipv4(m->server->fd_ipv4, i->hardware->index);
 335         if (i->protocol == AVAHI_PROTO_INET6)
 336             avahi_mdns_mcast_leave_ipv6(m->server->fd_ipv6, i->hardware->index);
 337
 338         avahi_goodbye_interface(m->server, i, 0);
 339         avahi_querier_free_all(i);
 340
 341         avahi_response_scheduler_clear(i->response_scheduler);
 342         avahi_query_scheduler_clear(i->query_scheduler);
 343         avahi_probe_scheduler_clear(i->probe_scheduler);
 344         avahi_cache_flush(i->cache);
 345
 346         i->announcing = 0;
 347     }
 348 }
 349
 350 static void check_hw_interface_relevant(AvahiInterfaceMonitor *m, AvahiHwInterface *hw) {
 351     AvahiInterface *i;
 352
 353     assert(m);
 354     assert(hw);
 355
 356     for (i = hw->interfaces; i; i = i->by_hardware_next)
 357         check_interface_relevant(m, i);
 358 }
 359
 360 static void check_all_interfaces_relevant(AvahiInterfaceMonitor *m) {
 361     AvahiInterface *i;
 362     assert(m);
 363
 364     for (i = m->interfaces; i; i = i->interface_next)
 365         check_interface_relevant(m, i);
 366 }
 367
 368 static void netlink_callback(AvahiNetlink *nl, struct nlmsghdr *n, void* userdata) {
 369     AvahiInterfaceMonitor *m = userdata;
 370
 371     assert(m);
 372     assert(n);
 373     assert(m->netlink == nl);
 374
 375     if (n->nlmsg_type == RTM_NEWLINK) {
 376         struct ifinfomsg *ifinfomsg = NLMSG_DATA(n);
 377         AvahiHwInterface *hw;
 378         struct rtattr *a = NULL;
 379         size_t l;
 380
 381         if (ifinfomsg->ifi_family != AF_UNSPEC)
 382             return;
 383
 384         if (!(hw = avahi_hashmap_lookup(m->hashmap, &ifinfomsg->ifi_index))) {
 385
 386             if (!(hw = avahi_new(AvahiHwInterface, 1)))
 387                 return; /* OOM */
 388
 389             hw->monitor = m;
 390             hw->name = NULL;
 391             hw->flags = 0;
 392             hw->mtu = 1500;
 393             hw->index = (AvahiIfIndex) ifinfomsg->ifi_index;
 394             hw->mac_address_size = 0;
 395             hw->entry_group = NULL;
 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)
 403                 new_interface(m, hw, AVAHI_PROTO_INET);
 404             if (m->server->fd_ipv6 >= 0)
 405                 new_interface(m, hw, AVAHI_PROTO_INET6);
 406         }
 407
 408         hw->flags = ifinfomsg->ifi_flags;
 409
 410         l = NLMSG_PAYLOAD(n, sizeof(struct ifinfomsg));
 411         a = IFLA_RTA(ifinfomsg);
 412
 413         while (RTA_OK(a, l)) {
 414             switch(a->rta_type) {
 415                 case IFLA_IFNAME:
 416                     avahi_free(hw->name);
 417                     hw->name = avahi_strndup(RTA_DATA(a), RTA_PAYLOAD(a));
 418                     break;
 419
 420                 case IFLA_MTU:
 421                     assert(RTA_PAYLOAD(a) == sizeof(unsigned int));
 422                     hw->mtu = *((unsigned int*) RTA_DATA(a));
 423                     break;
 424
 425                 case IFLA_ADDRESS: {
 426                     hw->mac_address_size = RTA_PAYLOAD(a);
 427                     if (hw->mac_address_size > AVAHI_MAX_MAC_ADDRESS)
 428                         hw->mac_address_size = AVAHI_MAX_MAC_ADDRESS;
 429
 430                     memcpy(hw->mac_address, RTA_DATA(a), hw->mac_address_size);
 431                     break;
 432                 }
 433
 434                 default:
 435                     ;
 436             }
 437
 438             a = RTA_NEXT(a, l);
 439         }
 440
 441         check_hw_interface_relevant(m, hw);
 442         update_hw_interface_rr(m, hw, 0);
 443
 444     } else if (n->nlmsg_type == RTM_DELLINK) {
 445         struct ifinfomsg *ifinfomsg = NLMSG_DATA(n);
 446         AvahiHwInterface *hw;
 447
 448         if (ifinfomsg->ifi_family != AF_UNSPEC)
 449             return;
 450
 451         if (!(hw = avahi_interface_monitor_get_hw_interface(m, (AvahiIfIndex) ifinfomsg->ifi_index)))
 452             return;
 453
 454         free_hw_interface(m, hw, 0);
 455
 456     } else if (n->nlmsg_type == RTM_NEWADDR || n->nlmsg_type == RTM_DELADDR) {
 457
 458         struct ifaddrmsg *ifaddrmsg = NLMSG_DATA(n);
 459         AvahiInterface *i;
 460         struct rtattr *a = NULL;
 461         size_t l;
 462         AvahiAddress raddr;
 463         int raddr_valid = 0;
 464
 465         if (ifaddrmsg->ifa_family != AF_INET && ifaddrmsg->ifa_family != AF_INET6)
 466             return;
 467
 468         if (!(i = (AvahiInterface*) avahi_interface_monitor_get_interface(m, (AvahiIfIndex) ifaddrmsg->ifa_index, avahi_af_to_proto(ifaddrmsg->ifa_family))))
 469             return;
 470
 471         raddr.proto = avahi_af_to_proto(ifaddrmsg->ifa_family);
 472
 473         l = NLMSG_PAYLOAD(n, sizeof(struct ifaddrmsg));
 474         a = IFA_RTA(ifaddrmsg);
 475
 476         while (RTA_OK(a, l)) {
 477
 478             switch(a->rta_type) {
 479                 case IFA_ADDRESS:
 480                     if ((raddr.proto == AVAHI_PROTO_INET6 && RTA_PAYLOAD(a) != 16) ||
 481                         (raddr.proto == AVAHI_PROTO_INET && RTA_PAYLOAD(a) != 4))
 482                         return;
 483
 484                     memcpy(raddr.data.data, RTA_DATA(a), RTA_PAYLOAD(a));
 485                     raddr_valid = 1;
 486
 487                     break;
 488
 489                 default:
 490                     ;
 491             }
 492
 493             a = RTA_NEXT(a, l);
 494         }
 495
 496         if (!raddr_valid)
 497             return;
 498
 499         if (n->nlmsg_type == RTM_NEWADDR) {
 500             AvahiInterfaceAddress *addr;
 501
 502             if (!(addr = get_address(m, i, &raddr))) {
 503                 if (!(addr = avahi_new(AvahiInterfaceAddress, 1)))
 504                     return; /* OOM */
 505
 506                 addr->monitor = m;
 507                 addr->address = raddr;
 508                 addr->interface = i;
 509                 addr->entry_group = NULL;
 510
 511                 AVAHI_LLIST_PREPEND(AvahiInterfaceAddress, address, i->addresses, addr);
 512             }
 513
 514             addr->flags = ifaddrmsg->ifa_flags;
 515             addr->scope = ifaddrmsg->ifa_scope;
 516             addr->prefix_len = ifaddrmsg->ifa_prefixlen;
 517         } else {
 518             AvahiInterfaceAddress *addr;
 519
 520             if (!(addr = get_address(m, i, &raddr)))
 521                 return;
 522
 523             free_address(m, addr);
 524         }
 525
 526         check_interface_relevant(m, i);
 527         update_interface_rr(m, i, 0);
 528
 529     } else if (n->nlmsg_type == NLMSG_DONE) {
 530
 531         if (m->list == LIST_IFACE) {
 532
 533             if (netlink_list_items(m->netlink, RTM_GETADDR, &m->query_addr_seq) < 0) {
 534                 avahi_log_warn("NETLINK: Failed to list addrs: %s", strerror(errno));
 535                 m->list = LIST_DONE;
 536             } else
 537                 m->list = LIST_ADDR;
 538
 539         } else
 540             /* We're through */
 541             m->list = LIST_DONE;
 542
 543         if (m->list == LIST_DONE) {
 544             check_all_interfaces_relevant(m);
 545             avahi_update_host_rrs(m, 0);
 546             avahi_log_info("Network interface enumeration completed.");
 547         }
 548
 549     } else if (n->nlmsg_type == NLMSG_ERROR && (n->nlmsg_seq == m->query_link_seq || n->nlmsg_seq == m->query_addr_seq)) {
 550         struct nlmsgerr *e = NLMSG_DATA (n);
 551
 552         if (e->error)
 553             avahi_log_warn("NETLINK: Failed to browse: %s", strerror(-e->error));
 554     }
 555 }
 556
 557 AvahiInterfaceMonitor *avahi_interface_monitor_new(AvahiServer *s) {
 558     AvahiInterfaceMonitor *m = NULL;
 559
 560     if (!(m = avahi_new0(AvahiInterfaceMonitor, 1)))
 561         return NULL; /* OOM */
 562
 563     m->server = s;
 564     if (!(m->netlink = avahi_netlink_new(s->poll_api, RTMGRP_LINK|RTMGRP_IPV4_IFADDR|RTMGRP_IPV6_IFADDR, netlink_callback, m)))
 565         goto fail;
 566
 567     m->hashmap = avahi_hashmap_new(avahi_int_hash, avahi_int_equal, NULL, NULL);
 568
 569     AVAHI_LLIST_HEAD_INIT(AvahiInterface, m->interfaces);
 570     AVAHI_LLIST_HEAD_INIT(AvahiHwInterface, m->hw_interfaces);
 571
 572     if (netlink_list_items(m->netlink, RTM_GETLINK, &m->query_link_seq) < 0)
 573         goto fail;
 574
 575     m->list = LIST_IFACE;
 576
 577     return m;
 578
 579 fail:
 580     avahi_interface_monitor_free(m);
 581     return NULL;
 582 }
 583
 584 void avahi_interface_monitor_sync(AvahiInterfaceMonitor *m) {
 585     assert(m);
 586
 587     while (m->list != LIST_DONE) {
 588         if (!avahi_netlink_work(m->netlink, 1))
 589             break;
 590     }
 591 }
 592
 593 void avahi_interface_monitor_free(AvahiInterfaceMonitor *m) {
 594     assert(m);
 595
 596     while (m->hw_interfaces)
 597         free_hw_interface(m, m->hw_interfaces, 1);
 598
 599     assert(!m->interfaces);
 600
 601     if (m->netlink)
 602         avahi_netlink_free(m->netlink);
 603
 604     if (m->hashmap)
 605         avahi_hashmap_free(m->hashmap);
 606
 607     avahi_free(m);
 608 }
 609
 610
 611 AvahiInterface* avahi_interface_monitor_get_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx, AvahiProtocol protocol) {
 612     AvahiHwInterface *hw;
 613     AvahiInterface *i;
 614
 615     assert(m);
 616     assert(idx >= 0);
 617     assert(protocol != AVAHI_PROTO_UNSPEC);
 618
 619     if (!(hw = avahi_interface_monitor_get_hw_interface(m, idx)))
 620         return NULL;
 621
 622     for (i = hw->interfaces; i; i = i->by_hardware_next)
 623         if (i->protocol == protocol)
 624             return i;
 625
 626     return NULL;
 627 }
 628
 629 AvahiHwInterface* avahi_interface_monitor_get_hw_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx) {
 630     assert(m);
 631     assert(idx > 0);
 632
 633     return avahi_hashmap_lookup(m->hashmap, &idx);
 634 }
 635
 636 void avahi_interface_send_packet_unicast(AvahiInterface *i, AvahiDnsPacket *p, const AvahiAddress *a, uint16_t port) {
 637     assert(i);
 638     assert(p);
 639 /*     char t[64]; */
 640
 641     if (!avahi_interface_relevant(i))
 642         return;
 643
 644     assert(!a || a->proto == i->protocol);
 645
 646 /*     if (a) */
 647 /*         avahi_log_debug("unicast sending on '%s.%i' to %s:%u", i->hardware->name, i->protocol, avahi_address_snprint(t, sizeof(t), a), port); */
 648 /*     else */
 649 /*         avahi_log_debug("multicast sending on '%s.%i'", i->hardware->name, i->protocol); */
 650
 651     if (i->protocol == AVAHI_PROTO_INET && i->monitor->server->fd_ipv4 >= 0)
 652         avahi_send_dns_packet_ipv4(i->monitor->server->fd_ipv4, i->hardware->index, p, a ? &a->data.ipv4 : NULL, port);
 653     else if (i->protocol == AVAHI_PROTO_INET6 && i->monitor->server->fd_ipv6 >= 0)
 654         avahi_send_dns_packet_ipv6(i->monitor->server->fd_ipv6, i->hardware->index, p, a ? &a->data.ipv6 : NULL, port);
 655 }
 656
 657 void avahi_interface_send_packet(AvahiInterface *i, AvahiDnsPacket *p) {
 658     assert(i);
 659     assert(p);
 660
 661     avahi_interface_send_packet_unicast(i, p, NULL, 0);
 662 }
 663
 664 int avahi_interface_post_query(AvahiInterface *i, AvahiKey *key, int immediately) {
 665     assert(i);
 666     assert(key);
 667
 668     if (avahi_interface_relevant(i))
 669         return avahi_query_scheduler_post(i->query_scheduler, key, immediately);
 670
 671     return 0;
 672 }
 673
 674 int avahi_interface_post_response(AvahiInterface *i, AvahiRecord *record, int flush_cache, const AvahiAddress *querier, int immediately) {
 675     assert(i);
 676     assert(record);
 677
 678     if (avahi_interface_relevant(i))
 679         return avahi_response_scheduler_post(i->response_scheduler, record, flush_cache, querier, immediately);
 680
 681     return 0;
 682 }
 683
 684 int avahi_interface_post_probe(AvahiInterface *i, AvahiRecord *record, int immediately) {
 685     assert(i);
 686     assert(record);
 687
 688     if (avahi_interface_relevant(i))
 689         return avahi_probe_scheduler_post(i->probe_scheduler, record, immediately);
 690
 691     return 0;
 692 }
 693
 694 int avahi_dump_caches(AvahiInterfaceMonitor *m, AvahiDumpCallback callback, void* userdata) {
 695     AvahiInterface *i;
 696     assert(m);
 697
 698     for (i = m->interfaces; i; i = i->interface_next) {
 699         if (avahi_interface_relevant(i)) {
 700             char ln[256];
 701             snprintf(ln, sizeof(ln), ";;; INTERFACE %s.%s ;;;", i->hardware->name, avahi_proto_to_string(i->protocol));
 702             callback(ln, userdata);
 703             if (avahi_cache_dump(i->cache, callback, userdata) < 0)
 704                 return -1;
 705         }
 706     }
 707
 708     return 0;
 709 }
 710
 711 int avahi_interface_relevant(AvahiInterface *i) {
 712     AvahiInterfaceAddress *a;
 713     int relevant_address;
 714
 715     assert(i);
 716
 717     relevant_address = 0;
 718
 719     for (a = i->addresses; a; a = a->address_next)
 720         if (avahi_interface_address_relevant(a)) {
 721             relevant_address = 1;
 722             break;
 723         }
 724
 725 /*     avahi_log_debug("%p. iface-relevant: %i %i %i %i %i %i", i, relevant_address, */
 726 /*               (i->hardware->flags & IFF_UP), */
 727 /*               (i->hardware->flags & IFF_RUNNING), */
 728 /*               !(i->hardware->flags & IFF_LOOPBACK), */
 729 /*               (i->hardware->flags & IFF_MULTICAST), */
 730 /*               !(i->hardware->flags & IFF_POINTOPOINT)); */
 731
 732     return
 733         (i->hardware->flags & IFF_UP) &&
 734         (!i->monitor->server->config.use_iff_running || (i->hardware->flags & IFF_RUNNING)) &&
 735         !(i->hardware->flags & IFF_LOOPBACK) &&
 736         (i->hardware->flags & IFF_MULTICAST) &&
 737         !(i->hardware->flags & IFF_POINTOPOINT) &&
 738         relevant_address;
 739 }
 740
 741 int avahi_interface_address_relevant(AvahiInterfaceAddress *a) {
 742     AvahiInterfaceAddress *b;
 743     assert(a);
 744
 745     /* Publish public IP addresses */
 746     if (a->scope == RT_SCOPE_UNIVERSE ||
 747         a->scope == RT_SCOPE_SITE)
 748         return 1;
 749
 750     if (a->scope == RT_SCOPE_LINK) {
 751
 752         /* Publish link local IP addresses if they are the only ones on the link */
 753         for (b = a->interface->addresses; b; b = b->address_next) {
 754             if (b == a)
 755                 continue;
 756
 757             if (b->scope == RT_SCOPE_UNIVERSE ||
 758                 b->scope == RT_SCOPE_SITE)
 759                 return 0;
 760         }
 761
 762         return 1;
 763     }
 764
 765     return 0;
 766 }
 767
 768 int avahi_interface_match(AvahiInterface *i, AvahiIfIndex idx, AvahiProtocol protocol) {
 769     assert(i);
 770
 771     if (idx != AVAHI_IF_UNSPEC && idx != i->hardware->index)
 772         return 0;
 773
 774     if (protocol != AVAHI_PROTO_UNSPEC && protocol != i->protocol)
 775         return 0;
 776
 777     return 1;
 778 }
 779
 780 void avahi_interface_monitor_walk(AvahiInterfaceMonitor *m, AvahiIfIndex interface, AvahiProtocol protocol, AvahiInterfaceMonitorWalkCallback callback, void* userdata) {
 781     assert(m);
 782     assert(callback);
 783
 784     if (interface != AVAHI_IF_UNSPEC) {
 785         if (protocol != AVAHI_PROTO_UNSPEC) {
 786             AvahiInterface *i;
 787
 788             if ((i = avahi_interface_monitor_get_interface(m, interface, protocol)))
 789                 callback(m, i, userdata);
 790
 791         } else {
 792             AvahiHwInterface *hw;
 793             AvahiInterface *i;
 794
 795             if ((hw = avahi_interface_monitor_get_hw_interface(m, interface)))
 796                 for (i = hw->interfaces; i; i = i->by_hardware_next)
 797                     if (avahi_interface_match(i, interface, protocol))
 798                         callback(m, i, userdata);
 799         }
 800
 801     } else {
 802         AvahiInterface *i;
 803
 804         for (i = m->interfaces; i; i = i->interface_next)
 805             if (avahi_interface_match(i, interface, protocol))
 806                 callback(m, i, userdata);
 807     }
 808 }
 809
 810 void avahi_update_host_rrs(AvahiInterfaceMonitor *m, int remove_rrs) {
 811     AvahiHwInterface *hw;
 812
 813     assert(m);
 814
 815     for (hw = m->hw_interfaces; hw; hw = hw->hardware_next)
 816         update_hw_interface_rr(m, hw, remove_rrs);
 817 }
 818
 819 int avahi_address_is_local(AvahiInterfaceMonitor *m, const AvahiAddress *a) {
 820     AvahiInterface *i;
 821     AvahiInterfaceAddress *ia;
 822     assert(m);
 823     assert(a);
 824
 825     for (i = m->interfaces; i; i = i->interface_next)
 826         for (ia = i->addresses; ia; ia = ia->address_next)
 827             if (avahi_address_cmp(a, &ia->address) == 0)
 828                 return 1;
 829
 830     return 0;
 831 }
 832
 833 int avahi_interface_address_on_link(AvahiInterface *i, const AvahiAddress *a) {
 834     AvahiInterfaceAddress *ia;
 835
 836     assert(i);
 837     assert(a);
 838
 839     if (a->proto != i->protocol)
 840         return 0;
 841
 842     for (ia = i->addresses; ia; ia = ia->address_next) {
 843
 844         if (a->proto == AVAHI_PROTO_INET) {
 845             uint32_t m;
 846
 847             m = ~(((uint32_t) -1) >> ia->prefix_len);
 848
 849             if ((ntohl(a->data.ipv4.address) & m) == (ntohl(ia->address.data.ipv4.address) & m))
 850                 return 1;
 851         } else {
 852             unsigned j;
 853             unsigned char pl;
 854             assert(a->proto == AVAHI_PROTO_INET6);
 855
 856             pl = ia->prefix_len;
 857
 858             for (j = 0; j < 16; j++) {
 859                 uint8_t m;
 860
 861                 if (pl == 0)
 862                     return 1;
 863
 864                 if (pl >= 8) {
 865                     m = 0xFF;
 866                     pl -= 8;
 867                 } else {
 868                     m = ~(0xFF >> pl);
 869                     pl = 0;
 870                 }
 871
 872                 if ((a->data.ipv6.address[j] & m) != (ia->address.data.ipv6.address[j] & m))
 873                     break;
 874             }
 875         }
 876     }
 877
 878     return 0;
 879 }
 880
 881 int avahi_interface_has_address(AvahiInterfaceMonitor *m, AvahiIfIndex iface, const AvahiAddress *a) {
 882     AvahiInterface *i;
 883     AvahiInterfaceAddress *j;
 884
 885     assert(m);
 886     assert(iface != AVAHI_IF_UNSPEC);
 887     assert(a);
 888
 889     if (!(i = avahi_interface_monitor_get_interface(m, iface, a->proto)))
 890         return 0;
 891
 892     for (j = i->addresses; j; j = j->address_next)
 893         if (avahi_address_cmp(a, &j->address) == 0)
 894             return 1;
 895
 896     return 0;
 897 }