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 (avahi_interface_address_relevant(a) &&
  51         !remove_rrs &&
  52         m->server->config.publish_addresses &&
  53         (m->server->state == AVAHI_SERVER_RUNNING ||
  54         m->server->state == AVAHI_SERVER_REGISTERING)) {
  55
  56         /* Fill the entry group */
  57         if (!a->entry_group)
  58             a->entry_group = avahi_s_entry_group_new(m->server, avahi_host_rr_entry_group_callback, NULL);
  59
  60         if (!a->entry_group) /* OOM */
  61             return;
  62
  63         if (avahi_s_entry_group_is_empty(a->entry_group)) {
  64
  65             if (avahi_server_add_address(m->server, a->entry_group, a->interface->hardware->index, a->interface->protocol, 0, NULL, &a->address) < 0) {
  66                 avahi_log_warn(__FILE__": avahi_server_add_address() failed: %s", avahi_strerror(m->server->error));
  67                 avahi_s_entry_group_free(a->entry_group);
  68                 a->entry_group = NULL;
  69                 return;
  70             }
  71
  72             avahi_s_entry_group_commit(a->entry_group);
  73         }
  74     } else {
  75
  76         /* Clear the entry group */
  77
  78         if (a->entry_group && !avahi_s_entry_group_is_empty(a->entry_group)) {
  79
  80             if (avahi_s_entry_group_get_state(a->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING)
  81                 avahi_server_decrease_host_rr_pending(m->server);
  82
  83             avahi_s_entry_group_reset(a->entry_group);
  84         }
  85     }
  86 }
  87
  88 static void update_interface_rr(AvahiInterfaceMonitor *m, AvahiInterface *i, int remove_rrs) {
  89     AvahiInterfaceAddress *a;
  90
  91     assert(m);
  92     assert(i);
  93
  94     for (a = i->addresses; a; a = a->address_next)
  95         update_address_rr(m, a, remove_rrs);
  96 }
  97
  98 static void update_hw_interface_rr(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, int remove_rrs) {
  99     AvahiInterface *i;
 100
 101     assert(m);
 102     assert(hw);
 103
 104     for (i = hw->interfaces; i; i = i->by_hardware_next)
 105         update_interface_rr(m, i, remove_rrs);
 106
 107     if (!remove_rrs &&
 108         m->server->config.publish_workstation &&
 109         (m->server->state == AVAHI_SERVER_RUNNING ||
 110         m->server->state == AVAHI_SERVER_REGISTERING)) {
 111
 112         if (!hw->entry_group)
 113             hw->entry_group = avahi_s_entry_group_new(m->server, avahi_host_rr_entry_group_callback, NULL);
 114
 115         if (!hw->entry_group)
 116             return; /* OOM */
 117
 118         if (avahi_s_entry_group_is_empty(hw->entry_group)) {
 119             char *name;
 120             char *t;
 121
 122             if (!(t = avahi_format_mac_address(hw->mac_address, hw->mac_address_size)))
 123                 return; /* OOM */
 124
 125             name = avahi_strdup_printf("%s [%s]", m->server->host_name, t);
 126             avahi_free(t);
 127
 128             if (!name)
 129                 return; /* OOM */
 130
 131             if (avahi_server_add_service(m->server, hw->entry_group, hw->index, AVAHI_PROTO_UNSPEC, name, "_workstation._tcp", NULL, NULL, 9, NULL) < 0) {
 132                 avahi_log_warn(__FILE__": avahi_server_add_service() failed.");
 133                 avahi_s_entry_group_free(hw->entry_group);
 134                 hw->entry_group = NULL;
 135             } else
 136                 avahi_s_entry_group_commit(hw->entry_group);
 137
 138             avahi_free(name);
 139         }
 140
 141     } else {
 142
 143         if (hw->entry_group && !avahi_s_entry_group_is_empty(hw->entry_group)) {
 144
 145             if (avahi_s_entry_group_get_state(hw->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING)
 146                 avahi_server_decrease_host_rr_pending(m->server);
 147
 148             avahi_s_entry_group_reset(hw->entry_group);
 149         }
 150     }
 151 }
 152
 153 static void free_address(AvahiInterfaceMonitor *m, AvahiInterfaceAddress *a) {
 154     assert(m);
 155     assert(a);
 156     assert(a->interface);
 157
 158     update_address_rr(m, a, 1);
 159     AVAHI_LLIST_REMOVE(AvahiInterfaceAddress, address, a->interface->addresses, a);
 160
 161     if (a->entry_group)
 162         avahi_s_entry_group_free(a->entry_group);
 163
 164     avahi_free(a);
 165 }
 166
 167 static void free_interface(AvahiInterfaceMonitor *m, AvahiInterface *i, int send_goodbye) {
 168     assert(m);
 169     assert(i);
 170
 171     avahi_goodbye_interface(m->server, i, send_goodbye);
 172     avahi_response_scheduler_force(i->response_scheduler);
 173
 174     assert(!i->announcements);
 175
 176     update_interface_rr(m, i, 1);
 177
 178     while (i->addresses)
 179         free_address(m, i->addresses);
 180
 181     avahi_response_scheduler_free(i->response_scheduler);
 182     avahi_query_scheduler_free(i->query_scheduler);
 183     avahi_probe_scheduler_free(i->probe_scheduler);
 184     avahi_cache_free(i->cache);
 185
 186     AVAHI_LLIST_REMOVE(AvahiInterface, interface, m->interfaces, i);
 187     AVAHI_LLIST_REMOVE(AvahiInterface, by_hardware, i->hardware->interfaces, i);
 188
 189     avahi_free(i);
 190 }
 191
 192 static void free_hw_interface(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, int send_goodbye) {
 193     assert(m);
 194     assert(hw);
 195
 196     update_hw_interface_rr(m, hw, 1);
 197
 198     while (hw->interfaces)
 199         free_interface(m, hw->interfaces, send_goodbye);
 200
 201     if (hw->entry_group)
 202         avahi_s_entry_group_free(hw->entry_group);
 203
 204     AVAHI_LLIST_REMOVE(AvahiHwInterface, hardware, m->hw_interfaces, hw);
 205     avahi_hashmap_remove(m->hashmap, &hw->index);
 206
 207     avahi_free(hw->name);
 208     avahi_free(hw);
 209 }
 210
 211 static AvahiInterfaceAddress* get_address(AvahiInterfaceMonitor *m, AvahiInterface *i, const AvahiAddress *raddr) {
 212     AvahiInterfaceAddress *ia;
 213
 214     assert(m);
 215     assert(i);
 216     assert(raddr);
 217
 218     for (ia = i->addresses; ia; ia = ia->address_next)
 219         if (avahi_address_cmp(&ia->address, raddr) == 0)
 220             return ia;
 221
 222     return NULL;
 223 }
 224
 225 static int netlink_list_items(AvahiNetlink *nl, uint16_t type, unsigned *ret_seq) {
 226     struct nlmsghdr *n;
 227     struct rtgenmsg *gen;
 228     uint8_t req[1024];
 229
 230     memset(&req, 0, sizeof(req));
 231     n = (struct nlmsghdr*) req;
 232     n->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg));
 233     n->nlmsg_type = type;
 234     n->nlmsg_flags = NLM_F_ROOT/*|NLM_F_MATCH*/|NLM_F_REQUEST;
 235     n->nlmsg_pid = 0;
 236
 237     gen = NLMSG_DATA(n);
 238     memset(gen, 0, sizeof(struct rtgenmsg));
 239     gen->rtgen_family = AF_UNSPEC;
 240
 241     return avahi_netlink_send(nl, n, ret_seq);
 242 }
 243
 244 static void new_interface(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, AvahiProtocol protocol) {
 245     AvahiInterface *i;
 246
 247     assert(m);
 248     assert(hw);
 249     assert(protocol != AVAHI_PROTO_UNSPEC);
 250
 251     if (!(i = avahi_new(AvahiInterface, 1)))
 252         goto fail; /* OOM */
 253
 254     i->monitor = m;
 255     i->hardware = hw;
 256     i->protocol = protocol;
 257     i->announcing = 0;
 258
 259     AVAHI_LLIST_HEAD_INIT(AvahiInterfaceAddress, i->addresses);
 260     AVAHI_LLIST_HEAD_INIT(AvahiAnnouncement, i->announcements);
 261
 262     i->cache = avahi_cache_new(m->server, i);
 263     i->response_scheduler = avahi_response_scheduler_new(i);
 264     i->query_scheduler = avahi_query_scheduler_new(i);
 265     i->probe_scheduler = avahi_probe_scheduler_new(i);
 266
 267     if (!i->cache || !i->response_scheduler || !i->query_scheduler || !i->probe_scheduler)
 268         goto fail; /* OOM */
 269
 270     AVAHI_LLIST_PREPEND(AvahiInterface, by_hardware, hw->interfaces, i);
 271     AVAHI_LLIST_PREPEND(AvahiInterface, interface, m->interfaces, i);
 272
 273     return;
 274 fail:
 275
 276     if (i) {
 277         if (i->cache)
 278             avahi_cache_free(i->cache);
 279         if (i->response_scheduler)
 280             avahi_response_scheduler_free(i->response_scheduler);
 281         if (i->query_scheduler)
 282             avahi_query_scheduler_free(i->query_scheduler);
 283         if (i->probe_scheduler)
 284             avahi_probe_scheduler_free(i->probe_scheduler);
 285     }
 286
 287 }
 288
 289 static void check_interface_relevant(AvahiInterfaceMonitor *m, AvahiInterface *i) {
 290     int b;
 291
 292     assert(m);
 293     assert(i);
 294
 295     b = avahi_interface_relevant(i);
 296
 297     if (b && !i->announcing) {
 298         avahi_log_debug("New relevant interface %s.%i (#%i)", i->hardware->name, i->protocol, i->hardware->index);
 299
 300         if (i->protocol == AVAHI_PROTO_INET)
 301             avahi_mdns_mcast_join_ipv4(m->server->fd_ipv4, i->hardware->index);
 302         if (i->protocol == AVAHI_PROTO_INET6)
 303             avahi_mdns_mcast_join_ipv6(m->server->fd_ipv6, i->hardware->index);
 304
 305         i->announcing = 1;
 306         avahi_announce_interface(m->server, i);
 307         avahi_browser_new_interface(m->server, i);
 308     } else if (!b && i->announcing) {
 309         avahi_log_debug("Interface %s.%i no longer relevant", i->hardware->name, i->protocol);
 310
 311         if (i->protocol == AVAHI_PROTO_INET)
 312             avahi_mdns_mcast_leave_ipv4(m->server->fd_ipv4, i->hardware->index);
 313         if (i->protocol == AVAHI_PROTO_INET6)
 314             avahi_mdns_mcast_leave_ipv6(m->server->fd_ipv6, i->hardware->index);
 315
 316         avahi_goodbye_interface(m->server, i, 0);
 317         avahi_response_scheduler_clear(i->response_scheduler);
 318         avahi_query_scheduler_clear(i->query_scheduler);
 319         avahi_probe_scheduler_clear(i->probe_scheduler);
 320         avahi_cache_flush(i->cache);
 321
 322         i->announcing = 0;
 323     }
 324 }
 325
 326 static void check_hw_interface_relevant(AvahiInterfaceMonitor *m, AvahiHwInterface *hw) {
 327     AvahiInterface *i;
 328
 329     assert(m);
 330     assert(hw);
 331
 332     for (i = hw->interfaces; i; i = i->by_hardware_next)
 333         check_interface_relevant(m, i);
 334 }
 335
 336 static void netlink_callback(AvahiNetlink *nl, struct nlmsghdr *n, void* userdata) {
 337     AvahiInterfaceMonitor *m = userdata;
 338
 339     assert(m);
 340     assert(n);
 341     assert(m->netlink == nl);
 342
 343     if (n->nlmsg_type == RTM_NEWLINK) {
 344         struct ifinfomsg *ifinfomsg = NLMSG_DATA(n);
 345         AvahiHwInterface *hw;
 346         struct rtattr *a = NULL;
 347         size_t l;
 348
 349         if (ifinfomsg->ifi_family != AF_UNSPEC)
 350             return;
 351
 352         if (!(hw = avahi_hashmap_lookup(m->hashmap, &ifinfomsg->ifi_index))) {
 353
 354             if (!(hw = avahi_new(AvahiHwInterface, 1)))
 355                 return; /* OOM */
 356
 357             hw->monitor = m;
 358             hw->name = NULL;
 359             hw->flags = 0;
 360             hw->mtu = 1500;
 361             hw->index = (AvahiIfIndex) ifinfomsg->ifi_index;
 362             hw->mac_address_size = 0;
 363             hw->entry_group = NULL;
 364
 365             AVAHI_LLIST_HEAD_INIT(AvahiInterface, hw->interfaces);
 366             AVAHI_LLIST_PREPEND(AvahiHwInterface, hardware, m->hw_interfaces, hw);
 367
 368             avahi_hashmap_insert(m->hashmap, &hw->index, hw);
 369
 370             if (m->server->fd_ipv4 >= 0)
 371                 new_interface(m, hw, AVAHI_PROTO_INET);
 372             if (m->server->fd_ipv6 >= 0)
 373                 new_interface(m, hw, AVAHI_PROTO_INET6);
 374         }
 375
 376         hw->flags = ifinfomsg->ifi_flags;
 377
 378         l = NLMSG_PAYLOAD(n, sizeof(struct ifinfomsg));
 379         a = IFLA_RTA(ifinfomsg);
 380
 381         while (RTA_OK(a, l)) {
 382             switch(a->rta_type) {
 383                 case IFLA_IFNAME:
 384                     avahi_free(hw->name);
 385                     hw->name = avahi_strndup(RTA_DATA(a), RTA_PAYLOAD(a));
 386                     break;
 387
 388                 case IFLA_MTU:
 389                     assert(RTA_PAYLOAD(a) == sizeof(unsigned int));
 390                     hw->mtu = *((unsigned int*) RTA_DATA(a));
 391                     break;
 392
 393                 case IFLA_ADDRESS: {
 394                     hw->mac_address_size = RTA_PAYLOAD(a);
 395                     if (hw->mac_address_size > AVAHI_MAX_MAC_ADDRESS)
 396                         hw->mac_address_size = AVAHI_MAX_MAC_ADDRESS;
 397
 398                     memcpy(hw->mac_address, RTA_DATA(a), hw->mac_address_size);
 399                     break;
 400                 }
 401
 402                 default:
 403                     ;
 404             }
 405
 406             a = RTA_NEXT(a, l);
 407         }
 408
 409         update_hw_interface_rr(m, hw, 0);
 410         check_hw_interface_relevant(m, hw);
 411
 412     } else if (n->nlmsg_type == RTM_DELLINK) {
 413         struct ifinfomsg *ifinfomsg = NLMSG_DATA(n);
 414         AvahiHwInterface *hw;
 415
 416         if (ifinfomsg->ifi_family != AF_UNSPEC)
 417             return;
 418
 419         if (!(hw = avahi_interface_monitor_get_hw_interface(m, (AvahiIfIndex) ifinfomsg->ifi_index)))
 420             return;
 421
 422         update_hw_interface_rr(m, hw, 1);
 423         free_hw_interface(m, hw, 0);
 424
 425     } else if (n->nlmsg_type == RTM_NEWADDR || n->nlmsg_type == RTM_DELADDR) {
 426
 427         struct ifaddrmsg *ifaddrmsg = NLMSG_DATA(n);
 428         AvahiInterface *i;
 429         struct rtattr *a = NULL;
 430         size_t l;
 431         AvahiAddress raddr;
 432         int raddr_valid = 0;
 433
 434         if (ifaddrmsg->ifa_family != AVAHI_PROTO_INET && ifaddrmsg->ifa_family != AVAHI_PROTO_INET6)
 435             return;
 436
 437         if (!(i = (AvahiInterface*) avahi_interface_monitor_get_interface(m, (AvahiIfIndex) ifaddrmsg->ifa_index, (AvahiProtocol) ifaddrmsg->ifa_family)))
 438             return;
 439
 440         raddr.family = (AvahiProtocol) ifaddrmsg->ifa_family;
 441
 442         l = NLMSG_PAYLOAD(n, sizeof(struct ifaddrmsg));
 443         a = IFA_RTA(ifaddrmsg);
 444
 445         while (RTA_OK(a, l)) {
 446
 447             switch(a->rta_type) {
 448                 case IFA_ADDRESS:
 449                     if ((raddr.family == AVAHI_PROTO_INET6 && RTA_PAYLOAD(a) != 16) ||
 450                         (raddr.family == AVAHI_PROTO_INET && RTA_PAYLOAD(a) != 4))
 451                         return;
 452
 453                     memcpy(raddr.data.data, RTA_DATA(a), RTA_PAYLOAD(a));
 454                     raddr_valid = 1;
 455
 456                     break;
 457
 458                 default:
 459                     ;
 460             }
 461
 462             a = RTA_NEXT(a, l);
 463         }
 464
 465         if (!raddr_valid)
 466             return;
 467
 468         if (n->nlmsg_type == RTM_NEWADDR) {
 469             AvahiInterfaceAddress *addr;
 470
 471             if (!(addr = get_address(m, i, &raddr))) {
 472                 if (!(addr = avahi_new(AvahiInterfaceAddress, 1)))
 473                     return; /* OOM */
 474
 475                 addr->monitor = m;
 476                 addr->address = raddr;
 477                 addr->interface = i;
 478                 addr->entry_group = NULL;
 479
 480                 AVAHI_LLIST_PREPEND(AvahiInterfaceAddress, address, i->addresses, addr);
 481             }
 482
 483             addr->flags = ifaddrmsg->ifa_flags;
 484             addr->scope = ifaddrmsg->ifa_scope;
 485             addr->prefix_len = ifaddrmsg->ifa_prefixlen;
 486
 487             update_address_rr(m, addr, 0);
 488         } else {
 489             AvahiInterfaceAddress *addr;
 490
 491             if (!(addr = get_address(m, i, &raddr)))
 492                 return;
 493
 494             update_address_rr(m, addr, 1);
 495             free_address(m, addr);
 496         }
 497
 498         check_interface_relevant(m, i);
 499
 500     } else if (n->nlmsg_type == NLMSG_DONE) {
 501
 502         if (m->list == LIST_IFACE) {
 503             m->list = LIST_DONE;
 504
 505             if (netlink_list_items(m->netlink, RTM_GETADDR, &m->query_addr_seq) < 0)
 506                 avahi_log_warn("NETLINK: Failed to list addrs: %s", strerror(errno));
 507             else
 508                 m->list = LIST_ADDR;
 509         } else {
 510             m->list = LIST_DONE;
 511             avahi_log_debug("Network interface enumeration completed");
 512         }
 513
 514     } else if (n->nlmsg_type == NLMSG_ERROR && (n->nlmsg_seq == m->query_link_seq || n->nlmsg_seq == m->query_addr_seq)) {
 515         struct nlmsgerr *e = NLMSG_DATA (n);
 516
 517         if (e->error)
 518             avahi_log_warn("NETLINK: Failed to browse: %s", strerror(-e->error));
 519     }
 520 }
 521
 522 AvahiInterfaceMonitor *avahi_interface_monitor_new(AvahiServer *s) {
 523     AvahiInterfaceMonitor *m = NULL;
 524
 525     if (!(m = avahi_new0(AvahiInterfaceMonitor, 1)))
 526         return NULL; /* OOM */
 527
 528     m->server = s;
 529     if (!(m->netlink = avahi_netlink_new(s->poll_api, RTMGRP_LINK|RTMGRP_IPV4_IFADDR|RTMGRP_IPV6_IFADDR, netlink_callback, m)))
 530         goto fail;
 531
 532     m->hashmap = avahi_hashmap_new(avahi_int_hash, avahi_int_equal, NULL, NULL);
 533
 534     AVAHI_LLIST_HEAD_INIT(AvahiInterface, m->interfaces);
 535     AVAHI_LLIST_HEAD_INIT(AvahiHwInterface, m->hw_interfaces);
 536
 537     if (netlink_list_items(m->netlink, RTM_GETLINK, &m->query_link_seq) < 0)
 538         goto fail;
 539
 540     m->list = LIST_IFACE;
 541
 542     return m;
 543
 544 fail:
 545     avahi_interface_monitor_free(m);
 546     return NULL;
 547 }
 548
 549 void avahi_interface_monitor_sync(AvahiInterfaceMonitor *m) {
 550     assert(m);
 551
 552     while (m->list != LIST_DONE) {
 553         if (!avahi_netlink_work(m->netlink, 1))
 554             break;
 555     }
 556 }
 557
 558 void avahi_interface_monitor_free(AvahiInterfaceMonitor *m) {
 559     assert(m);
 560
 561     while (m->hw_interfaces)
 562         free_hw_interface(m, m->hw_interfaces, 1);
 563
 564     assert(!m->interfaces);
 565
 566
 567     if (m->netlink)
 568         avahi_netlink_free(m->netlink);
 569
 570     if (m->hashmap)
 571         avahi_hashmap_free(m->hashmap);
 572
 573     avahi_free(m);
 574 }
 575
 576
 577 AvahiInterface* avahi_interface_monitor_get_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx, AvahiProtocol protocol) {
 578     AvahiHwInterface *hw;
 579     AvahiInterface *i;
 580
 581     assert(m);
 582     assert(idx > 0);
 583     assert(protocol != AVAHI_PROTO_UNSPEC);
 584
 585     if (!(hw = avahi_interface_monitor_get_hw_interface(m, idx)))
 586         return NULL;
 587
 588     for (i = hw->interfaces; i; i = i->by_hardware_next)
 589         if (i->protocol == protocol)
 590             return i;
 591
 592     return NULL;
 593 }
 594
 595 AvahiHwInterface* avahi_interface_monitor_get_hw_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx) {
 596     assert(m);
 597     assert(idx > 0);
 598
 599     return avahi_hashmap_lookup(m->hashmap, &idx);
 600 }
 601
 602 void avahi_interface_send_packet_unicast(AvahiInterface *i, AvahiDnsPacket *p, const AvahiAddress *a, uint16_t port) {
 603     assert(i);
 604     assert(p);
 605 /*     char t[64]; */
 606
 607     if (!avahi_interface_relevant(i))
 608         return;
 609
 610     assert(!a || a->family == i->protocol);
 611
 612 /*     if (a) */
 613 /*         avahi_log_debug("unicast sending on '%s.%i' to %s:%u", i->hardware->name, i->protocol, avahi_address_snprint(t, sizeof(t), a), port); */
 614 /*     else */
 615 /*         avahi_log_debug("multicast sending on '%s.%i'", i->hardware->name, i->protocol); */
 616
 617     if (i->protocol == AVAHI_PROTO_INET && i->monitor->server->fd_ipv4 >= 0)
 618         avahi_send_dns_packet_ipv4(i->monitor->server->fd_ipv4, i->hardware->index, p, a ? &a->data.ipv4 : NULL, port);
 619     else if (i->protocol == AVAHI_PROTO_INET6 && i->monitor->server->fd_ipv6 >= 0)
 620         avahi_send_dns_packet_ipv6(i->monitor->server->fd_ipv6, i->hardware->index, p, a ? &a->data.ipv6 : NULL, port);
 621 }
 622
 623 void avahi_interface_send_packet(AvahiInterface *i, AvahiDnsPacket *p) {
 624     assert(i);
 625     assert(p);
 626
 627     avahi_interface_send_packet_unicast(i, p, NULL, 0);
 628 }
 629
 630 int avahi_interface_post_query(AvahiInterface *i, AvahiKey *key, int immediately) {
 631     assert(i);
 632     assert(key);
 633
 634     if (avahi_interface_relevant(i))
 635         return avahi_query_scheduler_post(i->query_scheduler, key, immediately);
 636
 637     return 0;
 638 }
 639
 640 int avahi_interface_post_response(AvahiInterface *i, AvahiRecord *record, int flush_cache, const AvahiAddress *querier, int immediately) {
 641     assert(i);
 642     assert(record);
 643
 644     if (avahi_interface_relevant(i))
 645         return avahi_response_scheduler_post(i->response_scheduler, record, flush_cache, querier, immediately);
 646
 647     return 0;
 648 }
 649
 650 int avahi_interface_post_probe(AvahiInterface *i, AvahiRecord *record, int immediately) {
 651     assert(i);
 652     assert(record);
 653
 654     if (avahi_interface_relevant(i))
 655         return avahi_probe_scheduler_post(i->probe_scheduler, record, immediately);
 656
 657     return 0;
 658 }
 659
 660 int avahi_dump_caches(AvahiInterfaceMonitor *m, AvahiDumpCallback callback, void* userdata) {
 661     AvahiInterface *i;
 662     assert(m);
 663
 664     for (i = m->interfaces; i; i = i->interface_next) {
 665         if (avahi_interface_relevant(i)) {
 666             char ln[256];
 667             snprintf(ln, sizeof(ln), ";;; INTERFACE %s.%i ;;;", i->hardware->name, i->protocol);
 668             callback(ln, userdata);
 669             if (avahi_cache_dump(i->cache, callback, userdata) < 0)
 670                 return -1;
 671         }
 672     }
 673
 674     return 0;
 675 }
 676
 677 int avahi_interface_relevant(AvahiInterface *i) {
 678     AvahiInterfaceAddress *a;
 679     int relevant_address;
 680
 681     assert(i);
 682
 683     relevant_address = 0;
 684
 685     for (a = i->addresses; a; a = a->address_next)
 686         if (avahi_interface_address_relevant(a)) {
 687             relevant_address = 1;
 688             break;
 689         }
 690
 691 /*     avahi_log_debug("%p. iface-relevant: %i %i %i %i %i %i", i, relevant_address, */
 692 /*               (i->hardware->flags & IFF_UP), */
 693 /*               (i->hardware->flags & IFF_RUNNING), */
 694 /*               !(i->hardware->flags & IFF_LOOPBACK), */
 695 /*               (i->hardware->flags & IFF_MULTICAST), */
 696 /*               !(i->hardware->flags & IFF_POINTOPOINT)); */
 697
 698     return
 699         (i->hardware->flags & IFF_UP) &&
 700         (!i->monitor->server->config.use_iff_running || (i->hardware->flags & IFF_RUNNING)) &&
 701         !(i->hardware->flags & IFF_LOOPBACK) &&
 702         (i->hardware->flags & IFF_MULTICAST) &&
 703         !(i->hardware->flags & IFF_POINTOPOINT) &&
 704         relevant_address;
 705 }
 706
 707 int avahi_interface_address_relevant(AvahiInterfaceAddress *a) {
 708     assert(a);
 709
 710     return a->scope == RT_SCOPE_UNIVERSE;
 711 }
 712
 713
 714 int avahi_interface_match(AvahiInterface *i, AvahiIfIndex idx, AvahiProtocol protocol) {
 715     assert(i);
 716
 717     if (idx > 0 && idx != i->hardware->index)
 718         return 0;
 719
 720     if (protocol != AVAHI_PROTO_UNSPEC && protocol != i->protocol)
 721         return 0;
 722
 723     return 1;
 724 }
 725
 726 void avahi_interface_monitor_walk(AvahiInterfaceMonitor *m, AvahiIfIndex interface, AvahiProtocol protocol, AvahiInterfaceMonitorWalkCallback callback, void* userdata) {
 727     assert(m);
 728     assert(callback);
 729
 730     if (interface > 0) {
 731         if (protocol != AVAHI_PROTO_UNSPEC) {
 732             AvahiInterface *i;
 733
 734             if ((i = avahi_interface_monitor_get_interface(m, interface, protocol)))
 735                 callback(m, i, userdata);
 736
 737         } else {
 738             AvahiHwInterface *hw;
 739             AvahiInterface *i;
 740
 741             if ((hw = avahi_interface_monitor_get_hw_interface(m, interface)))
 742                 for (i = hw->interfaces; i; i = i->by_hardware_next)
 743                     if (avahi_interface_match(i, interface, protocol))
 744                         callback(m, i, userdata);
 745         }
 746
 747     } else {
 748         AvahiInterface *i;
 749
 750         for (i = m->interfaces; i; i = i->interface_next)
 751             if (avahi_interface_match(i, interface, protocol))
 752                 callback(m, i, userdata);
 753     }
 754 }
 755
 756 void avahi_update_host_rrs(AvahiInterfaceMonitor *m, int remove_rrs) {
 757     AvahiHwInterface *hw;
 758
 759     assert(m);
 760
 761     for (hw = m->hw_interfaces; hw; hw = hw->hardware_next)
 762         update_hw_interface_rr(m, hw, remove_rrs);
 763 }
 764
 765 int avahi_address_is_local(AvahiInterfaceMonitor *m, const AvahiAddress *a) {
 766     AvahiInterface *i;
 767     AvahiInterfaceAddress *ia;
 768     assert(m);
 769     assert(a);
 770
 771     for (i = m->interfaces; i; i = i->interface_next)
 772         for (ia = i->addresses; ia; ia = ia->address_next)
 773             if (avahi_address_cmp(a, &ia->address) == 0)
 774                 return 1;
 775
 776     return 0;
 777 }
 778
 779 int avahi_interface_address_on_link(AvahiInterface *i, const AvahiAddress *a) {
 780     AvahiInterfaceAddress *ia;
 781
 782     assert(i);
 783     assert(a);
 784
 785     if (a->family != i->protocol)
 786         return 0;
 787
 788     for (ia = i->addresses; ia; ia = ia->address_next) {
 789
 790         if (a->family == AVAHI_PROTO_INET) {
 791             uint32_t m;
 792
 793             m = ~(((uint32_t) -1) >> ia->prefix_len);
 794
 795             if ((ntohl(a->data.ipv4.address) & m) == (ntohl(ia->address.data.ipv4.address) & m))
 796                 return 1;
 797         } else {
 798             unsigned j;
 799             unsigned char pl;
 800             assert(a->family == AVAHI_PROTO_INET6);
 801
 802             pl = ia->prefix_len;
 803
 804             for (j = 0; j < 16; j++) {
 805                 uint8_t m;
 806
 807                 if (pl == 0)
 808                     return 1;
 809
 810                 if (pl >= 8) {
 811                     m = 0xFF;
 812                     pl -= 8;
 813                 } else {
 814                     m = ~(0xFF >> pl);
 815                     pl = 0;
 816                 }
 817
 818                 if ((a->data.ipv6.address[j] & m) != (ia->address.data.ipv6.address[j] & m))
 819                     break;
 820             }
 821         }
 822     }
 823
 824     return 0;
 825 }