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
  46 static void update_address_rr(AvahiInterfaceMonitor *m, AvahiInterfaceAddress *a, int remove_rrs) {
  47     assert(m);
  48     assert(a);
  49
  50     if (a->interface->announcing &&
  51         m->list == LIST_DONE &&
  52         avahi_interface_address_relevant(a) &&
  53         !remove_rrs &&
  54         m->server->config.publish_addresses &&
  55         (m->server->state == AVAHI_SERVER_RUNNING ||
  56         m->server->state == AVAHI_SERVER_REGISTERING)) {
  57
  58         /* Fill the entry group */
  59         if (!a->entry_group)
  60             a->entry_group = avahi_s_entry_group_new(m->server, avahi_host_rr_entry_group_callback, NULL);
  61
  62         if (!a->entry_group) /* OOM */
  63             return;
  64
  65         if (avahi_s_entry_group_is_empty(a->entry_group)) {
  66             char t[64];
  67             avahi_address_snprint(t, sizeof(t), &a->address);
  68
  69             avahi_log_info("Registering new address %s on %s.", t, a->interface->hardware->name);
  70
  71             if (avahi_server_add_address(m->server, a->entry_group, a->interface->hardware->index, a->interface->protocol, 0, NULL, &a->address) < 0) {
  72                 avahi_log_warn(__FILE__": avahi_server_add_address() failed: %s", avahi_strerror(m->server->error));
  73                 avahi_s_entry_group_free(a->entry_group);
  74                 a->entry_group = NULL;
  75                 return;
  76             }
  77
  78             avahi_s_entry_group_commit(a->entry_group);
  79         }
  80     } else {
  81
  82         /* Clear the entry group */
  83
  84         if (a->entry_group && !avahi_s_entry_group_is_empty(a->entry_group)) {
  85             char t[64];
  86             avahi_address_snprint(t, sizeof(t), &a->address);
  87
  88             if (avahi_s_entry_group_get_state(a->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING &&
  89                 m->server->state == AVAHI_SERVER_REGISTERING)
  90                 avahi_server_decrease_host_rr_pending(m->server);
  91
  92             avahi_log_info("Withdrawing address %s on %s.", t, a->interface->hardware->name);
  93
  94             avahi_s_entry_group_reset(a->entry_group);
  95         }
  96     }
  97 }
  98
  99 static void update_interface_rr(AvahiInterfaceMonitor *m, AvahiInterface *i, int remove_rrs) {
 100     AvahiInterfaceAddress *a;
 101
 102     assert(m);
 103     assert(i);
 104
 105     for (a = i->addresses; a; a = a->address_next)
 106         update_address_rr(m, a, remove_rrs);
 107 }
 108
 109 static void update_hw_interface_rr(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, int remove_rrs) {
 110     AvahiInterface *i;
 111
 112     assert(m);
 113     assert(hw);
 114
 115     for (i = hw->interfaces; i; i = i->by_hardware_next)
 116         update_interface_rr(m, i, remove_rrs);
 117
 118     if (m->list == LIST_DONE &&
 119         !remove_rrs &&
 120         m->server->config.publish_workstation &&
 121         (m->server->state == AVAHI_SERVER_RUNNING ||
 122         m->server->state == AVAHI_SERVER_REGISTERING)) {
 123
 124         if (!hw->entry_group)
 125             hw->entry_group = avahi_s_entry_group_new(m->server, avahi_host_rr_entry_group_callback, NULL);
 126
 127         if (!hw->entry_group)
 128             return; /* OOM */
 129
 130         if (avahi_s_entry_group_is_empty(hw->entry_group)) {
 131             char *name;
 132             char *t;
 133
 134             if (!(t = avahi_format_mac_address(hw->mac_address, hw->mac_address_size)))
 135                 return; /* OOM */
 136
 137             name = avahi_strdup_printf("%s [%s]", m->server->host_name, t);
 138             avahi_free(t);
 139
 140             if (!name)
 141                 return; /* OOM */
 142
 143             if (avahi_server_add_service(m->server, hw->entry_group, hw->index, AVAHI_PROTO_UNSPEC, name, "_workstation._tcp", NULL, NULL, 9, NULL) < 0) {
 144                 avahi_log_warn(__FILE__": avahi_server_add_service() failed.");
 145                 avahi_s_entry_group_free(hw->entry_group);
 146                 hw->entry_group = NULL;
 147             } else
 148                 avahi_s_entry_group_commit(hw->entry_group);
 149
 150             avahi_free(name);
 151         }
 152
 153     } else {
 154
 155         if (hw->entry_group && !avahi_s_entry_group_is_empty(hw->entry_group)) {
 156
 157             if (avahi_s_entry_group_get_state(hw->entry_group) == AVAHI_ENTRY_GROUP_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 static void free_address(AvahiInterfaceMonitor *m, AvahiInterfaceAddress *a) {
 166     assert(m);
 167     assert(a);
 168     assert(a->interface);
 169
 170     update_address_rr(m, a, 1);
 171     AVAHI_LLIST_REMOVE(AvahiInterfaceAddress, address, a->interface->addresses, a);
 172
 173     if (a->entry_group)
 174         avahi_s_entry_group_free(a->entry_group);
 175
 176     avahi_free(a);
 177 }
 178
 179 static void free_interface(AvahiInterfaceMonitor *m, AvahiInterface *i, int send_goodbye) {
 180     assert(m);
 181     assert(i);
 182
 183     avahi_goodbye_interface(m->server, i, send_goodbye);
 184     avahi_response_scheduler_force(i->response_scheduler);
 185
 186     assert(!i->announcements);
 187
 188     update_interface_rr(m, i, 1);
 189
 190     while (i->addresses)
 191         free_address(m, i->addresses);
 192
 193     avahi_response_scheduler_free(i->response_scheduler);
 194     avahi_query_scheduler_free(i->query_scheduler);
 195     avahi_probe_scheduler_free(i->probe_scheduler);
 196     avahi_cache_free(i->cache);
 197
 198     AVAHI_LLIST_REMOVE(AvahiInterface, interface, m->interfaces, i);
 199     AVAHI_LLIST_REMOVE(AvahiInterface, by_hardware, i->hardware->interfaces, i);
 200
 201     avahi_free(i);
 202 }
 203
 204 static void free_hw_interface(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, int send_goodbye) {
 205     assert(m);
 206     assert(hw);
 207
 208     update_hw_interface_rr(m, hw, 1);
 209
 210     while (hw->interfaces)
 211         free_interface(m, hw->interfaces, send_goodbye);
 212
 213     if (hw->entry_group)
 214         avahi_s_entry_group_free(hw->entry_group);
 215
 216     AVAHI_LLIST_REMOVE(AvahiHwInterface, hardware, m->hw_interfaces, hw);
 217     avahi_hashmap_remove(m->hashmap, &hw->index);
 218
 219     avahi_free(hw->name);
 220     avahi_free(hw);
 221 }
 222
 223 static AvahiInterfaceAddress* get_address(AvahiInterfaceMonitor *m, AvahiInterface *i, const AvahiAddress *raddr) {
 224     AvahiInterfaceAddress *ia;
 225
 226     assert(m);
 227     assert(i);
 228     assert(raddr);
 229
 230     for (ia = i->addresses; ia; ia = ia->address_next)
 231         if (avahi_address_cmp(&ia->address, raddr) == 0)
 232             return ia;
 233
 234     return NULL;
 235 }
 236
 237 static int netlink_list_items(AvahiNetlink *nl, uint16_t type, unsigned *ret_seq) {
 238     struct nlmsghdr *n;
 239     struct rtgenmsg *gen;
 240     uint8_t req[1024];
 241
 242     memset(&req, 0, sizeof(req));
 243     n = (struct nlmsghdr*) req;
 244     n->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg));
 245     n->nlmsg_type = type;
 246     n->nlmsg_flags = NLM_F_ROOT|NLM_F_REQUEST;
 247     n->nlmsg_pid = 0;
 248
 249     gen = NLMSG_DATA(n);
 250     memset(gen, 0, sizeof(struct rtgenmsg));
 251     gen->rtgen_family = AF_UNSPEC;
 252
 253     return avahi_netlink_send(nl, n, ret_seq);
 254 }
 255
 256 static void new_interface(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, AvahiProtocol protocol) {
 257     AvahiInterface *i;
 258
 259     assert(m);
 260     assert(hw);
 261     assert(protocol != AVAHI_PROTO_UNSPEC);
 262
 263     if (!(i = avahi_new(AvahiInterface, 1)))
 264         goto fail; /* OOM */
 265
 266     i->monitor = m;
 267     i->hardware = hw;
 268     i->protocol = protocol;
 269     i->announcing = 0;
 270
 271     AVAHI_LLIST_HEAD_INIT(AvahiInterfaceAddress, i->addresses);
 272     AVAHI_LLIST_HEAD_INIT(AvahiAnnouncement, i->announcements);
 273
 274     i->cache = avahi_cache_new(m->server, i);
 275     i->response_scheduler = avahi_response_scheduler_new(i);
 276     i->query_scheduler = avahi_query_scheduler_new(i);
 277     i->probe_scheduler = avahi_probe_scheduler_new(i);
 278
 279     if (!i->cache || !i->response_scheduler || !i->query_scheduler || !i->probe_scheduler)
 280         goto fail; /* OOM */
 281
 282     AVAHI_LLIST_PREPEND(AvahiInterface, by_hardware, hw->interfaces, i);
 283     AVAHI_LLIST_PREPEND(AvahiInterface, interface, m->interfaces, i);
 284
 285     return;
 286 fail:
 287
 288     if (i) {
 289         if (i->cache)
 290             avahi_cache_free(i->cache);
 291         if (i->response_scheduler)
 292             avahi_response_scheduler_free(i->response_scheduler);
 293         if (i->query_scheduler)
 294             avahi_query_scheduler_free(i->query_scheduler);
 295         if (i->probe_scheduler)
 296             avahi_probe_scheduler_free(i->probe_scheduler);
 297     }
 298
 299 }
 300
 301 static void check_interface_relevant(AvahiInterfaceMonitor *m, AvahiInterface *i) {
 302     int b;
 303
 304     assert(m);
 305     assert(i);
 306
 307     b = avahi_interface_relevant(i);
 308
 309     if (m->list == LIST_DONE && b && !i->announcing) {
 310         avahi_log_info("New relevant interface %s.%s.", i->hardware->name, avahi_proto_to_string(i->protocol));
 311
 312         if (i->protocol == AVAHI_PROTO_INET)
 313             avahi_mdns_mcast_join_ipv4(m->server->fd_ipv4, i->hardware->index);
 314         if (i->protocol == AVAHI_PROTO_INET6)
 315             avahi_mdns_mcast_join_ipv6(m->server->fd_ipv6, i->hardware->index);
 316
 317         i->announcing = 1;
 318         avahi_announce_interface(m->server, i);
 319         avahi_browser_new_interface(m->server, i);
 320     } else if (!b && i->announcing) {
 321         avahi_log_info("Interface %s.%s no longer relevant.", i->hardware->name, avahi_proto_to_string(i->protocol));
 322
 323         if (i->protocol == AVAHI_PROTO_INET)
 324             avahi_mdns_mcast_leave_ipv4(m->server->fd_ipv4, i->hardware->index);
 325         if (i->protocol == AVAHI_PROTO_INET6)
 326             avahi_mdns_mcast_leave_ipv6(m->server->fd_ipv6, i->hardware->index);
 327
 328         avahi_goodbye_interface(m->server, i, 0);
 329         avahi_response_scheduler_clear(i->response_scheduler);
 330         avahi_query_scheduler_clear(i->query_scheduler);
 331         avahi_probe_scheduler_clear(i->probe_scheduler);
 332         avahi_cache_flush(i->cache);
 333
 334         i->announcing = 0;
 335     }
 336 }
 337
 338 static void check_hw_interface_relevant(AvahiInterfaceMonitor *m, AvahiHwInterface *hw) {
 339     AvahiInterface *i;
 340
 341     assert(m);
 342     assert(hw);
 343
 344     for (i = hw->interfaces; i; i = i->by_hardware_next)
 345         check_interface_relevant(m, i);
 346 }
 347
 348 static void check_all_interfaces_relevant(AvahiInterfaceMonitor *m) {
 349     AvahiInterface *i;
 350     assert(m);
 351
 352     for (i = m->interfaces; i; i = i->interface_next)
 353         check_interface_relevant(m, i);
 354 }
 355
 356 static void netlink_callback(AvahiNetlink *nl, struct nlmsghdr *n, void* userdata) {
 357     AvahiInterfaceMonitor *m = userdata;
 358
 359     assert(m);
 360     assert(n);
 361     assert(m->netlink == nl);
 362
 363     if (n->nlmsg_type == RTM_NEWLINK) {
 364         struct ifinfomsg *ifinfomsg = NLMSG_DATA(n);
 365         AvahiHwInterface *hw;
 366         struct rtattr *a = NULL;
 367         size_t l;
 368
 369         if (ifinfomsg->ifi_family != AF_UNSPEC)
 370             return;
 371
 372         if (!(hw = avahi_hashmap_lookup(m->hashmap, &ifinfomsg->ifi_index))) {
 373
 374             if (!(hw = avahi_new(AvahiHwInterface, 1)))
 375                 return; /* OOM */
 376
 377             hw->monitor = m;
 378             hw->name = NULL;
 379             hw->flags = 0;
 380             hw->mtu = 1500;
 381             hw->index = (AvahiIfIndex) ifinfomsg->ifi_index;
 382             hw->mac_address_size = 0;
 383             hw->entry_group = NULL;
 384
 385             AVAHI_LLIST_HEAD_INIT(AvahiInterface, hw->interfaces);
 386             AVAHI_LLIST_PREPEND(AvahiHwInterface, hardware, m->hw_interfaces, hw);
 387
 388             avahi_hashmap_insert(m->hashmap, &hw->index, hw);
 389
 390             if (m->server->fd_ipv4 >= 0)
 391                 new_interface(m, hw, AVAHI_PROTO_INET);
 392             if (m->server->fd_ipv6 >= 0)
 393                 new_interface(m, hw, AVAHI_PROTO_INET6);
 394         }
 395
 396         hw->flags = ifinfomsg->ifi_flags;
 397
 398         l = NLMSG_PAYLOAD(n, sizeof(struct ifinfomsg));
 399         a = IFLA_RTA(ifinfomsg);
 400
 401         while (RTA_OK(a, l)) {
 402             switch(a->rta_type) {
 403                 case IFLA_IFNAME:
 404                     avahi_free(hw->name);
 405                     hw->name = avahi_strndup(RTA_DATA(a), RTA_PAYLOAD(a));
 406                     break;
 407
 408                 case IFLA_MTU:
 409                     assert(RTA_PAYLOAD(a) == sizeof(unsigned int));
 410                     hw->mtu = *((unsigned int*) RTA_DATA(a));
 411                     break;
 412
 413                 case IFLA_ADDRESS: {
 414                     hw->mac_address_size = RTA_PAYLOAD(a);
 415                     if (hw->mac_address_size > AVAHI_MAX_MAC_ADDRESS)
 416                         hw->mac_address_size = AVAHI_MAX_MAC_ADDRESS;
 417
 418                     memcpy(hw->mac_address, RTA_DATA(a), hw->mac_address_size);
 419                     break;
 420                 }
 421
 422                 default:
 423                     ;
 424             }
 425
 426             a = RTA_NEXT(a, l);
 427         }
 428
 429         check_hw_interface_relevant(m, hw);
 430         update_hw_interface_rr(m, hw, 0);
 431
 432     } else if (n->nlmsg_type == RTM_DELLINK) {
 433         struct ifinfomsg *ifinfomsg = NLMSG_DATA(n);
 434         AvahiHwInterface *hw;
 435
 436         if (ifinfomsg->ifi_family != AF_UNSPEC)
 437             return;
 438
 439         if (!(hw = avahi_interface_monitor_get_hw_interface(m, (AvahiIfIndex) ifinfomsg->ifi_index)))
 440             return;
 441
 442         free_hw_interface(m, hw, 0);
 443
 444     } else if (n->nlmsg_type == RTM_NEWADDR || n->nlmsg_type == RTM_DELADDR) {
 445
 446         struct ifaddrmsg *ifaddrmsg = NLMSG_DATA(n);
 447         AvahiInterface *i;
 448         struct rtattr *a = NULL;
 449         size_t l;
 450         AvahiAddress raddr;
 451         int raddr_valid = 0;
 452
 453         if (ifaddrmsg->ifa_family != AF_INET && ifaddrmsg->ifa_family != AF_INET6)
 454             return;
 455
 456         if (!(i = (AvahiInterface*) avahi_interface_monitor_get_interface(m, (AvahiIfIndex) ifaddrmsg->ifa_index, avahi_af_to_proto(ifaddrmsg->ifa_family))))
 457             return;
 458
 459         raddr.proto = avahi_af_to_proto(ifaddrmsg->ifa_family);
 460
 461         l = NLMSG_PAYLOAD(n, sizeof(struct ifaddrmsg));
 462         a = IFA_RTA(ifaddrmsg);
 463
 464         while (RTA_OK(a, l)) {
 465
 466             switch(a->rta_type) {
 467                 case IFA_ADDRESS:
 468                     if ((raddr.proto == AVAHI_PROTO_INET6 && RTA_PAYLOAD(a) != 16) ||
 469                         (raddr.proto == AVAHI_PROTO_INET && RTA_PAYLOAD(a) != 4))
 470                         return;
 471
 472                     memcpy(raddr.data.data, RTA_DATA(a), RTA_PAYLOAD(a));
 473                     raddr_valid = 1;
 474
 475                     break;
 476
 477                 default:
 478                     ;
 479             }
 480
 481             a = RTA_NEXT(a, l);
 482         }
 483
 484         if (!raddr_valid)
 485             return;
 486
 487         if (n->nlmsg_type == RTM_NEWADDR) {
 488             AvahiInterfaceAddress *addr;
 489
 490             if (!(addr = get_address(m, i, &raddr))) {
 491                 if (!(addr = avahi_new(AvahiInterfaceAddress, 1)))
 492                     return; /* OOM */
 493
 494                 addr->monitor = m;
 495                 addr->address = raddr;
 496                 addr->interface = i;
 497                 addr->entry_group = NULL;
 498
 499                 AVAHI_LLIST_PREPEND(AvahiInterfaceAddress, address, i->addresses, addr);
 500             }
 501
 502             addr->flags = ifaddrmsg->ifa_flags;
 503             addr->scope = ifaddrmsg->ifa_scope;
 504             addr->prefix_len = ifaddrmsg->ifa_prefixlen;
 505         } else {
 506             AvahiInterfaceAddress *addr;
 507
 508             if (!(addr = get_address(m, i, &raddr)))
 509                 return;
 510
 511             free_address(m, addr);
 512         }
 513
 514         check_interface_relevant(m, i);
 515         update_interface_rr(m, i, 0);
 516
 517     } else if (n->nlmsg_type == NLMSG_DONE) {
 518
 519         if (m->list == LIST_IFACE) {
 520
 521             if (netlink_list_items(m->netlink, RTM_GETADDR, &m->query_addr_seq) < 0) {
 522                 avahi_log_warn("NETLINK: Failed to list addrs: %s", strerror(errno));
 523                 m->list = LIST_DONE;
 524             } else
 525                 m->list = LIST_ADDR;
 526
 527         } else
 528             /* We're through */
 529             m->list = LIST_DONE;
 530
 531         if (m->list == LIST_DONE) {
 532             check_all_interfaces_relevant(m);
 533             avahi_update_host_rrs(m, 0);
 534             avahi_log_info("Network interface enumeration completed.");
 535         }
 536
 537     } else if (n->nlmsg_type == NLMSG_ERROR && (n->nlmsg_seq == m->query_link_seq || n->nlmsg_seq == m->query_addr_seq)) {
 538         struct nlmsgerr *e = NLMSG_DATA (n);
 539
 540         if (e->error)
 541             avahi_log_warn("NETLINK: Failed to browse: %s", strerror(-e->error));
 542     }
 543 }
 544
 545 AvahiInterfaceMonitor *avahi_interface_monitor_new(AvahiServer *s) {
 546     AvahiInterfaceMonitor *m = NULL;
 547
 548     if (!(m = avahi_new0(AvahiInterfaceMonitor, 1)))
 549         return NULL; /* OOM */
 550
 551     m->server = s;
 552     if (!(m->netlink = avahi_netlink_new(s->poll_api, RTMGRP_LINK|RTMGRP_IPV4_IFADDR|RTMGRP_IPV6_IFADDR, netlink_callback, m)))
 553         goto fail;
 554
 555     m->hashmap = avahi_hashmap_new(avahi_int_hash, avahi_int_equal, NULL, NULL);
 556
 557     AVAHI_LLIST_HEAD_INIT(AvahiInterface, m->interfaces);
 558     AVAHI_LLIST_HEAD_INIT(AvahiHwInterface, m->hw_interfaces);
 559
 560     if (netlink_list_items(m->netlink, RTM_GETLINK, &m->query_link_seq) < 0)
 561         goto fail;
 562
 563     m->list = LIST_IFACE;
 564
 565     return m;
 566
 567 fail:
 568     avahi_interface_monitor_free(m);
 569     return NULL;
 570 }
 571
 572 void avahi_interface_monitor_sync(AvahiInterfaceMonitor *m) {
 573     assert(m);
 574
 575     while (m->list != LIST_DONE) {
 576         if (!avahi_netlink_work(m->netlink, 1))
 577             break;
 578     }
 579 }
 580
 581 void avahi_interface_monitor_free(AvahiInterfaceMonitor *m) {
 582     assert(m);
 583
 584     while (m->hw_interfaces)
 585         free_hw_interface(m, m->hw_interfaces, 1);
 586
 587     assert(!m->interfaces);
 588
 589
 590     if (m->netlink)
 591         avahi_netlink_free(m->netlink);
 592
 593     if (m->hashmap)
 594         avahi_hashmap_free(m->hashmap);
 595
 596     avahi_free(m);
 597 }
 598
 599
 600 AvahiInterface* avahi_interface_monitor_get_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx, AvahiProtocol protocol) {
 601     AvahiHwInterface *hw;
 602     AvahiInterface *i;
 603
 604     assert(m);
 605     assert(idx > 0);
 606     assert(protocol != AVAHI_PROTO_UNSPEC);
 607
 608     if (!(hw = avahi_interface_monitor_get_hw_interface(m, idx)))
 609         return NULL;
 610
 611     for (i = hw->interfaces; i; i = i->by_hardware_next)
 612         if (i->protocol == protocol)
 613             return i;
 614
 615     return NULL;
 616 }
 617
 618 AvahiHwInterface* avahi_interface_monitor_get_hw_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx) {
 619     assert(m);
 620     assert(idx > 0);
 621
 622     return avahi_hashmap_lookup(m->hashmap, &idx);
 623 }
 624
 625 void avahi_interface_send_packet_unicast(AvahiInterface *i, AvahiDnsPacket *p, const AvahiAddress *a, uint16_t port) {
 626     assert(i);
 627     assert(p);
 628 /*     char t[64]; */
 629
 630     if (!avahi_interface_relevant(i))
 631         return;
 632
 633     assert(!a || a->proto == i->protocol);
 634
 635 /*     if (a) */
 636 /*         avahi_log_debug("unicast sending on '%s.%i' to %s:%u", i->hardware->name, i->protocol, avahi_address_snprint(t, sizeof(t), a), port); */
 637 /*     else */
 638 /*         avahi_log_debug("multicast sending on '%s.%i'", i->hardware->name, i->protocol); */
 639
 640     if (i->protocol == AVAHI_PROTO_INET && i->monitor->server->fd_ipv4 >= 0)
 641         avahi_send_dns_packet_ipv4(i->monitor->server->fd_ipv4, i->hardware->index, p, a ? &a->data.ipv4 : NULL, port);
 642     else if (i->protocol == AVAHI_PROTO_INET6 && i->monitor->server->fd_ipv6 >= 0)
 643         avahi_send_dns_packet_ipv6(i->monitor->server->fd_ipv6, i->hardware->index, p, a ? &a->data.ipv6 : NULL, port);
 644 }
 645
 646 void avahi_interface_send_packet(AvahiInterface *i, AvahiDnsPacket *p) {
 647     assert(i);
 648     assert(p);
 649
 650     avahi_interface_send_packet_unicast(i, p, NULL, 0);
 651 }
 652
 653 int avahi_interface_post_query(AvahiInterface *i, AvahiKey *key, int immediately) {
 654     assert(i);
 655     assert(key);
 656
 657     if (avahi_interface_relevant(i))
 658         return avahi_query_scheduler_post(i->query_scheduler, key, immediately);
 659
 660     return 0;
 661 }
 662
 663 int avahi_interface_post_response(AvahiInterface *i, AvahiRecord *record, int flush_cache, const AvahiAddress *querier, int immediately) {
 664     assert(i);
 665     assert(record);
 666
 667     if (avahi_interface_relevant(i))
 668         return avahi_response_scheduler_post(i->response_scheduler, record, flush_cache, querier, immediately);
 669
 670     return 0;
 671 }
 672
 673 int avahi_interface_post_probe(AvahiInterface *i, AvahiRecord *record, int immediately) {
 674     assert(i);
 675     assert(record);
 676
 677     if (avahi_interface_relevant(i))
 678         return avahi_probe_scheduler_post(i->probe_scheduler, record, immediately);
 679
 680     return 0;
 681 }
 682
 683 int avahi_dump_caches(AvahiInterfaceMonitor *m, AvahiDumpCallback callback, void* userdata) {
 684     AvahiInterface *i;
 685     assert(m);
 686
 687     for (i = m->interfaces; i; i = i->interface_next) {
 688         if (avahi_interface_relevant(i)) {
 689             char ln[256];
 690             snprintf(ln, sizeof(ln), ";;; INTERFACE %s.%s ;;;", i->hardware->name, avahi_proto_to_string(i->protocol));
 691             callback(ln, userdata);
 692             if (avahi_cache_dump(i->cache, callback, userdata) < 0)
 693                 return -1;
 694         }
 695     }
 696
 697     return 0;
 698 }
 699
 700 int avahi_interface_relevant(AvahiInterface *i) {
 701     AvahiInterfaceAddress *a;
 702     int relevant_address;
 703
 704     assert(i);
 705
 706     relevant_address = 0;
 707
 708     for (a = i->addresses; a; a = a->address_next)
 709         if (avahi_interface_address_relevant(a)) {
 710             relevant_address = 1;
 711             break;
 712         }
 713
 714 /*     avahi_log_debug("%p. iface-relevant: %i %i %i %i %i %i", i, relevant_address, */
 715 /*               (i->hardware->flags & IFF_UP), */
 716 /*               (i->hardware->flags & IFF_RUNNING), */
 717 /*               !(i->hardware->flags & IFF_LOOPBACK), */
 718 /*               (i->hardware->flags & IFF_MULTICAST), */
 719 /*               !(i->hardware->flags & IFF_POINTOPOINT)); */
 720
 721     return
 722         (i->hardware->flags & IFF_UP) &&
 723         (!i->monitor->server->config.use_iff_running || (i->hardware->flags & IFF_RUNNING)) &&
 724         !(i->hardware->flags & IFF_LOOPBACK) &&
 725         (i->hardware->flags & IFF_MULTICAST) &&
 726         !(i->hardware->flags & IFF_POINTOPOINT) &&
 727         relevant_address;
 728 }
 729
 730 int avahi_interface_address_relevant(AvahiInterfaceAddress *a) {
 731     AvahiInterfaceAddress *b;
 732     assert(a);
 733
 734     /* Publish public IP addresses */
 735     if (a->scope == RT_SCOPE_UNIVERSE ||
 736         a->scope == RT_SCOPE_SITE)
 737         return 1;
 738
 739     if (a->scope == RT_SCOPE_LINK) {
 740
 741         /* Publish link local IP addresses if they are the only ones on the link */
 742         for (b = a->interface->addresses; b; b = b->address_next) {
 743             if (b == a)
 744                 continue;
 745
 746             if (b->scope == RT_SCOPE_UNIVERSE ||
 747                 b->scope == RT_SCOPE_SITE)
 748                 return 0;
 749         }
 750
 751         return 1;
 752     }
 753
 754     return 0;
 755 }
 756
 757 int avahi_interface_match(AvahiInterface *i, AvahiIfIndex idx, AvahiProtocol protocol) {
 758     assert(i);
 759
 760     if (idx > 0 && idx != i->hardware->index)
 761         return 0;
 762
 763     if (protocol != AVAHI_PROTO_UNSPEC && protocol != i->protocol)
 764         return 0;
 765
 766     return 1;
 767 }
 768
 769 void avahi_interface_monitor_walk(AvahiInterfaceMonitor *m, AvahiIfIndex interface, AvahiProtocol protocol, AvahiInterfaceMonitorWalkCallback callback, void* userdata) {
 770     assert(m);
 771     assert(callback);
 772
 773     if (interface > 0) {
 774         if (protocol != AVAHI_PROTO_UNSPEC) {
 775             AvahiInterface *i;
 776
 777             if ((i = avahi_interface_monitor_get_interface(m, interface, protocol)))
 778                 callback(m, i, userdata);
 779
 780         } else {
 781             AvahiHwInterface *hw;
 782             AvahiInterface *i;
 783
 784             if ((hw = avahi_interface_monitor_get_hw_interface(m, interface)))
 785                 for (i = hw->interfaces; i; i = i->by_hardware_next)
 786                     if (avahi_interface_match(i, interface, protocol))
 787                         callback(m, i, userdata);
 788         }
 789
 790     } else {
 791         AvahiInterface *i;
 792
 793         for (i = m->interfaces; i; i = i->interface_next)
 794             if (avahi_interface_match(i, interface, protocol))
 795                 callback(m, i, userdata);
 796     }
 797 }
 798
 799 void avahi_update_host_rrs(AvahiInterfaceMonitor *m, int remove_rrs) {
 800     AvahiHwInterface *hw;
 801
 802     assert(m);
 803
 804     for (hw = m->hw_interfaces; hw; hw = hw->hardware_next)
 805         update_hw_interface_rr(m, hw, remove_rrs);
 806 }
 807
 808 int avahi_address_is_local(AvahiInterfaceMonitor *m, const AvahiAddress *a) {
 809     AvahiInterface *i;
 810     AvahiInterfaceAddress *ia;
 811     assert(m);
 812     assert(a);
 813
 814     for (i = m->interfaces; i; i = i->interface_next)
 815         for (ia = i->addresses; ia; ia = ia->address_next)
 816             if (avahi_address_cmp(a, &ia->address) == 0)
 817                 return 1;
 818
 819     return 0;
 820 }
 821
 822 int avahi_interface_address_on_link(AvahiInterface *i, const AvahiAddress *a) {
 823     AvahiInterfaceAddress *ia;
 824
 825     assert(i);
 826     assert(a);
 827
 828     if (a->proto != i->protocol)
 829         return 0;
 830
 831     for (ia = i->addresses; ia; ia = ia->address_next) {
 832
 833         if (a->proto == AVAHI_PROTO_INET) {
 834             uint32_t m;
 835
 836             m = ~(((uint32_t) -1) >> ia->prefix_len);
 837
 838             if ((ntohl(a->data.ipv4.address) & m) == (ntohl(ia->address.data.ipv4.address) & m))
 839                 return 1;
 840         } else {
 841             unsigned j;
 842             unsigned char pl;
 843             assert(a->proto == AVAHI_PROTO_INET6);
 844
 845             pl = ia->prefix_len;
 846
 847             for (j = 0; j < 16; j++) {
 848                 uint8_t m;
 849
 850                 if (pl == 0)
 851                     return 1;
 852
 853                 if (pl >= 8) {
 854                     m = 0xFF;
 855                     pl -= 8;
 856                 } else {
 857                     m = ~(0xFF >> pl);
 858                     pl = 0;
 859                 }
 860
 861                 if ((a->data.ipv6.address[j] & m) != (ia->address.data.ipv6.address[j] & m))
 862                     break;
 863             }
 864         }
 865     }
 866
 867     return 0;
 868 }
 869
 870 int avahi_interface_has_address(AvahiInterfaceMonitor *m, AvahiIfIndex iface, const AvahiAddress *a) {
 871     AvahiInterface *i;
 872     AvahiInterfaceAddress *j;
 873
 874     assert(m);
 875     assert(iface != AVAHI_IF_UNSPEC);
 876     assert(a);
 877
 878     if (!(i = avahi_interface_monitor_get_interface(m, iface, a->proto)))
 879         return 0;
 880
 881     for (j = i->addresses; j; j = j->address_next)
 882         if (avahi_address_cmp(a, &j->address) == 0)
 883             return 1;
 884
 885     return 0;
 886 }