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                 avahi_server_decrease_host_rr_pending(m->server);
  90
  91             avahi_log_info("Withdrawing address %s on %s.", t, a->interface->hardware->name);
  92
  93             avahi_s_entry_group_reset(a->entry_group);
  94         }
  95     }
  96 }
  97
  98 static void update_interface_rr(AvahiInterfaceMonitor *m, AvahiInterface *i, int remove_rrs) {
  99     AvahiInterfaceAddress *a;
 100
 101     assert(m);
 102     assert(i);
 103
 104     for (a = i->addresses; a; a = a->address_next)
 105         update_address_rr(m, a, remove_rrs);
 106 }
 107
 108 static void update_hw_interface_rr(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, int remove_rrs) {
 109     AvahiInterface *i;
 110
 111     assert(m);
 112     assert(hw);
 113
 114     for (i = hw->interfaces; i; i = i->by_hardware_next)
 115         update_interface_rr(m, i, remove_rrs);
 116
 117     if (m->list == LIST_DONE &&
 118         !remove_rrs &&
 119         m->server->config.publish_workstation &&
 120         (m->server->state == AVAHI_SERVER_RUNNING ||
 121         m->server->state == AVAHI_SERVER_REGISTERING)) {
 122
 123         if (!hw->entry_group)
 124             hw->entry_group = avahi_s_entry_group_new(m->server, avahi_host_rr_entry_group_callback, NULL);
 125
 126         if (!hw->entry_group)
 127             return; /* OOM */
 128
 129         if (avahi_s_entry_group_is_empty(hw->entry_group)) {
 130             char *name;
 131             char *t;
 132
 133             if (!(t = avahi_format_mac_address(hw->mac_address, hw->mac_address_size)))
 134                 return; /* OOM */
 135
 136             name = avahi_strdup_printf("%s [%s]", m->server->host_name, t);
 137             avahi_free(t);
 138
 139             if (!name)
 140                 return; /* OOM */
 141
 142             if (avahi_server_add_service(m->server, hw->entry_group, hw->index, AVAHI_PROTO_UNSPEC, name, "_workstation._tcp", NULL, NULL, 9, NULL) < 0) {
 143                 avahi_log_warn(__FILE__": avahi_server_add_service() failed.");
 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             avahi_free(name);
 150         }
 151
 152     } else {
 153
 154         if (hw->entry_group && !avahi_s_entry_group_is_empty(hw->entry_group)) {
 155
 156             if (avahi_s_entry_group_get_state(hw->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING)
 157                 avahi_server_decrease_host_rr_pending(m->server);
 158
 159             avahi_s_entry_group_reset(hw->entry_group);
 160         }
 161     }
 162 }
 163
 164 static void free_address(AvahiInterfaceMonitor *m, AvahiInterfaceAddress *a) {
 165     assert(m);
 166     assert(a);
 167     assert(a->interface);
 168
 169     update_address_rr(m, a, 1);
 170     AVAHI_LLIST_REMOVE(AvahiInterfaceAddress, address, a->interface->addresses, a);
 171
 172     if (a->entry_group)
 173         avahi_s_entry_group_free(a->entry_group);
 174
 175     avahi_free(a);
 176 }
 177
 178 static void free_interface(AvahiInterfaceMonitor *m, AvahiInterface *i, int send_goodbye) {
 179     assert(m);
 180     assert(i);
 181
 182     avahi_goodbye_interface(m->server, i, send_goodbye);
 183     avahi_response_scheduler_force(i->response_scheduler);
 184
 185     assert(!i->announcements);
 186
 187     update_interface_rr(m, i, 1);
 188
 189     while (i->addresses)
 190         free_address(m, i->addresses);
 191
 192     avahi_response_scheduler_free(i->response_scheduler);
 193     avahi_query_scheduler_free(i->query_scheduler);
 194     avahi_probe_scheduler_free(i->probe_scheduler);
 195     avahi_cache_free(i->cache);
 196
 197     AVAHI_LLIST_REMOVE(AvahiInterface, interface, m->interfaces, i);
 198     AVAHI_LLIST_REMOVE(AvahiInterface, by_hardware, i->hardware->interfaces, i);
 199
 200     avahi_free(i);
 201 }
 202
 203 static void free_hw_interface(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, int send_goodbye) {
 204     assert(m);
 205     assert(hw);
 206
 207     update_hw_interface_rr(m, hw, 1);
 208
 209     while (hw->interfaces)
 210         free_interface(m, hw->interfaces, send_goodbye);
 211
 212     if (hw->entry_group)
 213         avahi_s_entry_group_free(hw->entry_group);
 214
 215     AVAHI_LLIST_REMOVE(AvahiHwInterface, hardware, m->hw_interfaces, hw);
 216     avahi_hashmap_remove(m->hashmap, &hw->index);
 217
 218     avahi_free(hw->name);
 219     avahi_free(hw);
 220 }
 221
 222 static AvahiInterfaceAddress* get_address(AvahiInterfaceMonitor *m, AvahiInterface *i, const AvahiAddress *raddr) {
 223     AvahiInterfaceAddress *ia;
 224
 225     assert(m);
 226     assert(i);
 227     assert(raddr);
 228
 229     for (ia = i->addresses; ia; ia = ia->address_next)
 230         if (avahi_address_cmp(&ia->address, raddr) == 0)
 231             return ia;
 232
 233     return NULL;
 234 }
 235
 236 static int netlink_list_items(AvahiNetlink *nl, uint16_t type, unsigned *ret_seq) {
 237     struct nlmsghdr *n;
 238     struct rtgenmsg *gen;
 239     uint8_t req[1024];
 240
 241     memset(&req, 0, sizeof(req));
 242     n = (struct nlmsghdr*) req;
 243     n->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg));
 244     n->nlmsg_type = type;
 245     n->nlmsg_flags = NLM_F_ROOT/*|NLM_F_MATCH*/|NLM_F_REQUEST;
 246     n->nlmsg_pid = 0;
 247
 248     gen = NLMSG_DATA(n);
 249     memset(gen, 0, sizeof(struct rtgenmsg));
 250     gen->rtgen_family = AF_UNSPEC;
 251
 252     return avahi_netlink_send(nl, n, ret_seq);
 253 }
 254
 255 static void new_interface(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, AvahiProtocol protocol) {
 256     AvahiInterface *i;
 257
 258     assert(m);
 259     assert(hw);
 260     assert(protocol != AVAHI_PROTO_UNSPEC);
 261
 262     if (!(i = avahi_new(AvahiInterface, 1)))
 263         goto fail; /* OOM */
 264
 265     i->monitor = m;
 266     i->hardware = hw;
 267     i->protocol = protocol;
 268     i->announcing = 0;
 269
 270     AVAHI_LLIST_HEAD_INIT(AvahiInterfaceAddress, i->addresses);
 271     AVAHI_LLIST_HEAD_INIT(AvahiAnnouncement, i->announcements);
 272
 273     i->cache = avahi_cache_new(m->server, i);
 274     i->response_scheduler = avahi_response_scheduler_new(i);
 275     i->query_scheduler = avahi_query_scheduler_new(i);
 276     i->probe_scheduler = avahi_probe_scheduler_new(i);
 277
 278     if (!i->cache || !i->response_scheduler || !i->query_scheduler || !i->probe_scheduler)
 279         goto fail; /* OOM */
 280
 281     AVAHI_LLIST_PREPEND(AvahiInterface, by_hardware, hw->interfaces, i);
 282     AVAHI_LLIST_PREPEND(AvahiInterface, interface, m->interfaces, i);
 283
 284     return;
 285 fail:
 286
 287     if (i) {
 288         if (i->cache)
 289             avahi_cache_free(i->cache);
 290         if (i->response_scheduler)
 291             avahi_response_scheduler_free(i->response_scheduler);
 292         if (i->query_scheduler)
 293             avahi_query_scheduler_free(i->query_scheduler);
 294         if (i->probe_scheduler)
 295             avahi_probe_scheduler_free(i->probe_scheduler);
 296     }
 297
 298 }
 299
 300 static void check_interface_relevant(AvahiInterfaceMonitor *m, AvahiInterface *i) {
 301     int b;
 302
 303     assert(m);
 304     assert(i);
 305
 306     b = avahi_interface_relevant(i);
 307
 308     if (m->list == LIST_DONE && b && !i->announcing) {
 309         avahi_log_info("New relevant interface %s.%i.", i->hardware->name, i->protocol);
 310
 311         if (i->protocol == AVAHI_PROTO_INET)
 312             avahi_mdns_mcast_join_ipv4(m->server->fd_ipv4, i->hardware->index);
 313         if (i->protocol == AVAHI_PROTO_INET6)
 314             avahi_mdns_mcast_join_ipv6(m->server->fd_ipv6, i->hardware->index);
 315
 316         i->announcing = 1;
 317         avahi_announce_interface(m->server, i);
 318         avahi_browser_new_interface(m->server, i);
 319     } else if (!b && i->announcing) {
 320         avahi_log_info("Interface %s.%i no longer relevant.", i->hardware->name, i->protocol);
 321
 322         if (i->protocol == AVAHI_PROTO_INET)
 323             avahi_mdns_mcast_leave_ipv4(m->server->fd_ipv4, i->hardware->index);
 324         if (i->protocol == AVAHI_PROTO_INET6)
 325             avahi_mdns_mcast_leave_ipv6(m->server->fd_ipv6, i->hardware->index);
 326
 327         avahi_goodbye_interface(m->server, i, 0);
 328         avahi_response_scheduler_clear(i->response_scheduler);
 329         avahi_query_scheduler_clear(i->query_scheduler);
 330         avahi_probe_scheduler_clear(i->probe_scheduler);
 331         avahi_cache_flush(i->cache);
 332
 333         i->announcing = 0;
 334     }
 335 }
 336
 337 static void check_hw_interface_relevant(AvahiInterfaceMonitor *m, AvahiHwInterface *hw) {
 338     AvahiInterface *i;
 339
 340     assert(m);
 341     assert(hw);
 342
 343     for (i = hw->interfaces; i; i = i->by_hardware_next)
 344         check_interface_relevant(m, i);
 345 }
 346
 347 static void check_all_interfaces_relevant(AvahiInterfaceMonitor *m) {
 348     AvahiInterface *i;
 349     assert(m);
 350
 351     for (i = m->interfaces; i; i = i->interface_next)
 352         check_interface_relevant(m, i);
 353 }
 354
 355 static void netlink_callback(AvahiNetlink *nl, struct nlmsghdr *n, void* userdata) {
 356     AvahiInterfaceMonitor *m = userdata;
 357
 358     assert(m);
 359     assert(n);
 360     assert(m->netlink == nl);
 361
 362     if (n->nlmsg_type == RTM_NEWLINK) {
 363         struct ifinfomsg *ifinfomsg = NLMSG_DATA(n);
 364         AvahiHwInterface *hw;
 365         struct rtattr *a = NULL;
 366         size_t l;
 367
 368         if (ifinfomsg->ifi_family != AF_UNSPEC)
 369             return;
 370
 371         if (!(hw = avahi_hashmap_lookup(m->hashmap, &ifinfomsg->ifi_index))) {
 372
 373             if (!(hw = avahi_new(AvahiHwInterface, 1)))
 374                 return; /* OOM */
 375
 376             hw->monitor = m;
 377             hw->name = NULL;
 378             hw->flags = 0;
 379             hw->mtu = 1500;
 380             hw->index = (AvahiIfIndex) ifinfomsg->ifi_index;
 381             hw->mac_address_size = 0;
 382             hw->entry_group = NULL;
 383
 384             AVAHI_LLIST_HEAD_INIT(AvahiInterface, hw->interfaces);
 385             AVAHI_LLIST_PREPEND(AvahiHwInterface, hardware, m->hw_interfaces, hw);
 386
 387             avahi_hashmap_insert(m->hashmap, &hw->index, hw);
 388
 389             if (m->server->fd_ipv4 >= 0)
 390                 new_interface(m, hw, AVAHI_PROTO_INET);
 391             if (m->server->fd_ipv6 >= 0)
 392                 new_interface(m, hw, AVAHI_PROTO_INET6);
 393         }
 394
 395         hw->flags = ifinfomsg->ifi_flags;
 396
 397         l = NLMSG_PAYLOAD(n, sizeof(struct ifinfomsg));
 398         a = IFLA_RTA(ifinfomsg);
 399
 400         while (RTA_OK(a, l)) {
 401             switch(a->rta_type) {
 402                 case IFLA_IFNAME:
 403                     avahi_free(hw->name);
 404                     hw->name = avahi_strndup(RTA_DATA(a), RTA_PAYLOAD(a));
 405                     break;
 406
 407                 case IFLA_MTU:
 408                     assert(RTA_PAYLOAD(a) == sizeof(unsigned int));
 409                     hw->mtu = *((unsigned int*) RTA_DATA(a));
 410                     break;
 411
 412                 case IFLA_ADDRESS: {
 413                     hw->mac_address_size = RTA_PAYLOAD(a);
 414                     if (hw->mac_address_size > AVAHI_MAX_MAC_ADDRESS)
 415                         hw->mac_address_size = AVAHI_MAX_MAC_ADDRESS;
 416
 417                     memcpy(hw->mac_address, RTA_DATA(a), hw->mac_address_size);
 418                     break;
 419                 }
 420
 421                 default:
 422                     ;
 423             }
 424
 425             a = RTA_NEXT(a, l);
 426         }
 427
 428         check_hw_interface_relevant(m, hw);
 429         update_hw_interface_rr(m, hw, 0);
 430
 431     } else if (n->nlmsg_type == RTM_DELLINK) {
 432         struct ifinfomsg *ifinfomsg = NLMSG_DATA(n);
 433         AvahiHwInterface *hw;
 434
 435         if (ifinfomsg->ifi_family != AF_UNSPEC)
 436             return;
 437
 438         if (!(hw = avahi_interface_monitor_get_hw_interface(m, (AvahiIfIndex) ifinfomsg->ifi_index)))
 439             return;
 440
 441         free_hw_interface(m, hw, 0);
 442
 443     } else if (n->nlmsg_type == RTM_NEWADDR || n->nlmsg_type == RTM_DELADDR) {
 444
 445         struct ifaddrmsg *ifaddrmsg = NLMSG_DATA(n);
 446         AvahiInterface *i;
 447         struct rtattr *a = NULL;
 448         size_t l;
 449         AvahiAddress raddr;
 450         int raddr_valid = 0;
 451
 452         if (ifaddrmsg->ifa_family != AVAHI_PROTO_INET && ifaddrmsg->ifa_family != AVAHI_PROTO_INET6)
 453             return;
 454
 455         if (!(i = (AvahiInterface*) avahi_interface_monitor_get_interface(m, (AvahiIfIndex) ifaddrmsg->ifa_index, (AvahiProtocol) ifaddrmsg->ifa_family)))
 456             return;
 457
 458         raddr.family = (AvahiProtocol) ifaddrmsg->ifa_family;
 459
 460         l = NLMSG_PAYLOAD(n, sizeof(struct ifaddrmsg));
 461         a = IFA_RTA(ifaddrmsg);
 462
 463         while (RTA_OK(a, l)) {
 464
 465             switch(a->rta_type) {
 466                 case IFA_ADDRESS:
 467                     if ((raddr.family == AVAHI_PROTO_INET6 && RTA_PAYLOAD(a) != 16) ||
 468                         (raddr.family == AVAHI_PROTO_INET && RTA_PAYLOAD(a) != 4))
 469                         return;
 470
 471                     memcpy(raddr.data.data, RTA_DATA(a), RTA_PAYLOAD(a));
 472                     raddr_valid = 1;
 473
 474                     break;
 475
 476                 default:
 477                     ;
 478             }
 479
 480             a = RTA_NEXT(a, l);
 481         }
 482
 483         if (!raddr_valid)
 484             return;
 485
 486         if (n->nlmsg_type == RTM_NEWADDR) {
 487             AvahiInterfaceAddress *addr;
 488
 489             if (!(addr = get_address(m, i, &raddr))) {
 490                 if (!(addr = avahi_new(AvahiInterfaceAddress, 1)))
 491                     return; /* OOM */
 492
 493                 addr->monitor = m;
 494                 addr->address = raddr;
 495                 addr->interface = i;
 496                 addr->entry_group = NULL;
 497
 498                 AVAHI_LLIST_PREPEND(AvahiInterfaceAddress, address, i->addresses, addr);
 499             }
 500
 501             addr->flags = ifaddrmsg->ifa_flags;
 502             addr->scope = ifaddrmsg->ifa_scope;
 503             addr->prefix_len = ifaddrmsg->ifa_prefixlen;
 504         } else {
 505             AvahiInterfaceAddress *addr;
 506
 507             if (!(addr = get_address(m, i, &raddr)))
 508                 return;
 509
 510             free_address(m, addr);
 511         }
 512
 513         check_interface_relevant(m, i);
 514         update_interface_rr(m, i, 0);
 515
 516     } else if (n->nlmsg_type == NLMSG_DONE) {
 517
 518         if (m->list == LIST_IFACE) {
 519
 520             if (netlink_list_items(m->netlink, RTM_GETADDR, &m->query_addr_seq) < 0) {
 521                 avahi_log_warn("NETLINK: Failed to list addrs: %s", strerror(errno));
 522                 m->list = LIST_DONE;
 523             } else
 524                 m->list = LIST_ADDR;
 525
 526         } else
 527             /* We're through */
 528             m->list = LIST_DONE;
 529
 530         if (m->list == LIST_DONE) {
 531             check_all_interfaces_relevant(m);
 532             avahi_update_host_rrs(m, 0);
 533             avahi_log_info("Network interface enumeration completed.");
 534         }
 535
 536     } else if (n->nlmsg_type == NLMSG_ERROR && (n->nlmsg_seq == m->query_link_seq || n->nlmsg_seq == m->query_addr_seq)) {
 537         struct nlmsgerr *e = NLMSG_DATA (n);
 538
 539         if (e->error)
 540             avahi_log_warn("NETLINK: Failed to browse: %s", strerror(-e->error));
 541     }
 542 }
 543
 544 AvahiInterfaceMonitor *avahi_interface_monitor_new(AvahiServer *s) {
 545     AvahiInterfaceMonitor *m = NULL;
 546
 547     if (!(m = avahi_new0(AvahiInterfaceMonitor, 1)))
 548         return NULL; /* OOM */
 549
 550     m->server = s;
 551     if (!(m->netlink = avahi_netlink_new(s->poll_api, RTMGRP_LINK|RTMGRP_IPV4_IFADDR|RTMGRP_IPV6_IFADDR, netlink_callback, m)))
 552         goto fail;
 553
 554     m->hashmap = avahi_hashmap_new(avahi_int_hash, avahi_int_equal, NULL, NULL);
 555
 556     AVAHI_LLIST_HEAD_INIT(AvahiInterface, m->interfaces);
 557     AVAHI_LLIST_HEAD_INIT(AvahiHwInterface, m->hw_interfaces);
 558
 559     if (netlink_list_items(m->netlink, RTM_GETLINK, &m->query_link_seq) < 0)
 560         goto fail;
 561
 562     m->list = LIST_IFACE;
 563
 564     return m;
 565
 566 fail:
 567     avahi_interface_monitor_free(m);
 568     return NULL;
 569 }
 570
 571 void avahi_interface_monitor_sync(AvahiInterfaceMonitor *m) {
 572     assert(m);
 573
 574     while (m->list != LIST_DONE) {
 575         if (!avahi_netlink_work(m->netlink, 1))
 576             break;
 577     }
 578 }
 579
 580 void avahi_interface_monitor_free(AvahiInterfaceMonitor *m) {
 581     assert(m);
 582
 583     while (m->hw_interfaces)
 584         free_hw_interface(m, m->hw_interfaces, 1);
 585
 586     assert(!m->interfaces);
 587
 588
 589     if (m->netlink)
 590         avahi_netlink_free(m->netlink);
 591
 592     if (m->hashmap)
 593         avahi_hashmap_free(m->hashmap);
 594
 595     avahi_free(m);
 596 }
 597
 598
 599 AvahiInterface* avahi_interface_monitor_get_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx, AvahiProtocol protocol) {
 600     AvahiHwInterface *hw;
 601     AvahiInterface *i;
 602
 603     assert(m);
 604     assert(idx > 0);
 605     assert(protocol != AVAHI_PROTO_UNSPEC);
 606
 607     if (!(hw = avahi_interface_monitor_get_hw_interface(m, idx)))
 608         return NULL;
 609
 610     for (i = hw->interfaces; i; i = i->by_hardware_next)
 611         if (i->protocol == protocol)
 612             return i;
 613
 614     return NULL;
 615 }
 616
 617 AvahiHwInterface* avahi_interface_monitor_get_hw_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx) {
 618     assert(m);
 619     assert(idx > 0);
 620
 621     return avahi_hashmap_lookup(m->hashmap, &idx);
 622 }
 623
 624 void avahi_interface_send_packet_unicast(AvahiInterface *i, AvahiDnsPacket *p, const AvahiAddress *a, uint16_t port) {
 625     assert(i);
 626     assert(p);
 627 /*     char t[64]; */
 628
 629     if (!avahi_interface_relevant(i))
 630         return;
 631
 632     assert(!a || a->family == i->protocol);
 633
 634 /*     if (a) */
 635 /*         avahi_log_debug("unicast sending on '%s.%i' to %s:%u", i->hardware->name, i->protocol, avahi_address_snprint(t, sizeof(t), a), port); */
 636 /*     else */
 637 /*         avahi_log_debug("multicast sending on '%s.%i'", i->hardware->name, i->protocol); */
 638
 639     if (i->protocol == AVAHI_PROTO_INET && i->monitor->server->fd_ipv4 >= 0)
 640         avahi_send_dns_packet_ipv4(i->monitor->server->fd_ipv4, i->hardware->index, p, a ? &a->data.ipv4 : NULL, port);
 641     else if (i->protocol == AVAHI_PROTO_INET6 && i->monitor->server->fd_ipv6 >= 0)
 642         avahi_send_dns_packet_ipv6(i->monitor->server->fd_ipv6, i->hardware->index, p, a ? &a->data.ipv6 : NULL, port);
 643 }
 644
 645 void avahi_interface_send_packet(AvahiInterface *i, AvahiDnsPacket *p) {
 646     assert(i);
 647     assert(p);
 648
 649     avahi_interface_send_packet_unicast(i, p, NULL, 0);
 650 }
 651
 652 int avahi_interface_post_query(AvahiInterface *i, AvahiKey *key, int immediately) {
 653     assert(i);
 654     assert(key);
 655
 656     if (avahi_interface_relevant(i))
 657         return avahi_query_scheduler_post(i->query_scheduler, key, immediately);
 658
 659     return 0;
 660 }
 661
 662 int avahi_interface_post_response(AvahiInterface *i, AvahiRecord *record, int flush_cache, const AvahiAddress *querier, int immediately) {
 663     assert(i);
 664     assert(record);
 665
 666     if (avahi_interface_relevant(i))
 667         return avahi_response_scheduler_post(i->response_scheduler, record, flush_cache, querier, immediately);
 668
 669     return 0;
 670 }
 671
 672 int avahi_interface_post_probe(AvahiInterface *i, AvahiRecord *record, int immediately) {
 673     assert(i);
 674     assert(record);
 675
 676     if (avahi_interface_relevant(i))
 677         return avahi_probe_scheduler_post(i->probe_scheduler, record, immediately);
 678
 679     return 0;
 680 }
 681
 682 int avahi_dump_caches(AvahiInterfaceMonitor *m, AvahiDumpCallback callback, void* userdata) {
 683     AvahiInterface *i;
 684     assert(m);
 685
 686     for (i = m->interfaces; i; i = i->interface_next) {
 687         if (avahi_interface_relevant(i)) {
 688             char ln[256];
 689             snprintf(ln, sizeof(ln), ";;; INTERFACE %s.%i ;;;", i->hardware->name, i->protocol);
 690             callback(ln, userdata);
 691             if (avahi_cache_dump(i->cache, callback, userdata) < 0)
 692                 return -1;
 693         }
 694     }
 695
 696     return 0;
 697 }
 698
 699 int avahi_interface_relevant(AvahiInterface *i) {
 700     AvahiInterfaceAddress *a;
 701     int relevant_address;
 702
 703     assert(i);
 704
 705     relevant_address = 0;
 706
 707     for (a = i->addresses; a; a = a->address_next)
 708         if (avahi_interface_address_relevant(a)) {
 709             relevant_address = 1;
 710             break;
 711         }
 712
 713 /*     avahi_log_debug("%p. iface-relevant: %i %i %i %i %i %i", i, relevant_address, */
 714 /*               (i->hardware->flags & IFF_UP), */
 715 /*               (i->hardware->flags & IFF_RUNNING), */
 716 /*               !(i->hardware->flags & IFF_LOOPBACK), */
 717 /*               (i->hardware->flags & IFF_MULTICAST), */
 718 /*               !(i->hardware->flags & IFF_POINTOPOINT)); */
 719
 720     return
 721         (i->hardware->flags & IFF_UP) &&
 722         (!i->monitor->server->config.use_iff_running || (i->hardware->flags & IFF_RUNNING)) &&
 723         !(i->hardware->flags & IFF_LOOPBACK) &&
 724         (i->hardware->flags & IFF_MULTICAST) &&
 725         !(i->hardware->flags & IFF_POINTOPOINT) &&
 726         relevant_address;
 727 }
 728
 729 int avahi_interface_address_relevant(AvahiInterfaceAddress *a) {
 730     AvahiInterfaceAddress *b;
 731     assert(a);
 732
 733     /* Publish public IP addresses */
 734     if (a->scope == RT_SCOPE_UNIVERSE ||
 735         a->scope == RT_SCOPE_SITE)
 736         return 1;
 737
 738     if (a->scope == RT_SCOPE_LINK) {
 739
 740         /* Publish link local IP addresses if they are the only ones on the link */
 741         for (b = a->interface->addresses; b; b = b->address_next) {
 742             if (b == a)
 743                 continue;
 744
 745             if (b->scope == RT_SCOPE_UNIVERSE ||
 746                 b->scope == RT_SCOPE_SITE)
 747                 return 0;
 748         }
 749
 750         return 1;
 751     }
 752
 753     return 0;
 754 }
 755
 756 int avahi_interface_match(AvahiInterface *i, AvahiIfIndex idx, AvahiProtocol protocol) {
 757     assert(i);
 758
 759     if (idx > 0 && idx != i->hardware->index)
 760         return 0;
 761
 762     if (protocol != AVAHI_PROTO_UNSPEC && protocol != i->protocol)
 763         return 0;
 764
 765     return 1;
 766 }
 767
 768 void avahi_interface_monitor_walk(AvahiInterfaceMonitor *m, AvahiIfIndex interface, AvahiProtocol protocol, AvahiInterfaceMonitorWalkCallback callback, void* userdata) {
 769     assert(m);
 770     assert(callback);
 771
 772     if (interface > 0) {
 773         if (protocol != AVAHI_PROTO_UNSPEC) {
 774             AvahiInterface *i;
 775
 776             if ((i = avahi_interface_monitor_get_interface(m, interface, protocol)))
 777                 callback(m, i, userdata);
 778
 779         } else {
 780             AvahiHwInterface *hw;
 781             AvahiInterface *i;
 782
 783             if ((hw = avahi_interface_monitor_get_hw_interface(m, interface)))
 784                 for (i = hw->interfaces; i; i = i->by_hardware_next)
 785                     if (avahi_interface_match(i, interface, protocol))
 786                         callback(m, i, userdata);
 787         }
 788
 789     } else {
 790         AvahiInterface *i;
 791
 792         for (i = m->interfaces; i; i = i->interface_next)
 793             if (avahi_interface_match(i, interface, protocol))
 794                 callback(m, i, userdata);
 795     }
 796 }
 797
 798 void avahi_update_host_rrs(AvahiInterfaceMonitor *m, int remove_rrs) {
 799     AvahiHwInterface *hw;
 800
 801     assert(m);
 802
 803     for (hw = m->hw_interfaces; hw; hw = hw->hardware_next)
 804         update_hw_interface_rr(m, hw, remove_rrs);
 805 }
 806
 807 int avahi_address_is_local(AvahiInterfaceMonitor *m, const AvahiAddress *a) {
 808     AvahiInterface *i;
 809     AvahiInterfaceAddress *ia;
 810     assert(m);
 811     assert(a);
 812
 813     for (i = m->interfaces; i; i = i->interface_next)
 814         for (ia = i->addresses; ia; ia = ia->address_next)
 815             if (avahi_address_cmp(a, &ia->address) == 0)
 816                 return 1;
 817
 818     return 0;
 819 }
 820
 821 int avahi_interface_address_on_link(AvahiInterface *i, const AvahiAddress *a) {
 822     AvahiInterfaceAddress *ia;
 823
 824     assert(i);
 825     assert(a);
 826
 827     if (a->family != i->protocol)
 828         return 0;
 829
 830     for (ia = i->addresses; ia; ia = ia->address_next) {
 831
 832         if (a->family == AVAHI_PROTO_INET) {
 833             uint32_t m;
 834
 835             m = ~(((uint32_t) -1) >> ia->prefix_len);
 836
 837             if ((ntohl(a->data.ipv4.address) & m) == (ntohl(ia->address.data.ipv4.address) & m))
 838                 return 1;
 839         } else {
 840             unsigned j;
 841             unsigned char pl;
 842             assert(a->family == AVAHI_PROTO_INET6);
 843
 844             pl = ia->prefix_len;
 845
 846             for (j = 0; j < 16; j++) {
 847                 uint8_t m;
 848
 849                 if (pl == 0)
 850                     return 1;
 851
 852                 if (pl >= 8) {
 853                     m = 0xFF;
 854                     pl -= 8;
 855                 } else {
 856                     m = ~(0xFF >> pl);
 857                     pl = 0;
 858                 }
 859
 860                 if ((a->data.ipv6.address[j] & m) != (ia->address.data.ipv6.address[j] & m))
 861                     break;
 862             }
 863         }
 864     }
 865
 866     return 0;
 867 }
 868
 869 int avahi_interface_has_address(AvahiInterfaceMonitor *m, AvahiIfIndex iface, const AvahiAddress *a) {
 870     AvahiInterface *i;
 871     AvahiInterfaceAddress *j;
 872
 873     assert(m);
 874     assert(iface != AVAHI_IF_UNSPEC);
 875     assert(a);
 876
 877     if (!(i = avahi_interface_monitor_get_interface(m, iface, a->family)))
 878         return 0;
 879
 880     for (j = i->addresses; j; j = j->address_next)
 881         if (avahi_address_cmp(a, &j->address) == 0)
 882             return 1;
 883
 884     return 0;
 885 }