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 (m->list == LIST_DONE &&
  51         avahi_interface_address_relevant(a) &&
  52         !remove_rrs &&
  53         m->server->config.publish_addresses &&
  54         (m->server->state == AVAHI_SERVER_RUNNING ||
  55         m->server->state == AVAHI_SERVER_REGISTERING)) {
  56
  57         /* Fill the entry group */
  58         if (!a->entry_group)
  59             a->entry_group = avahi_s_entry_group_new(m->server, avahi_host_rr_entry_group_callback, NULL);
  60
  61         if (!a->entry_group) /* OOM */
  62             return;
  63
  64         if (avahi_s_entry_group_is_empty(a->entry_group)) {
  65             char t[64];
  66             avahi_address_snprint(t, sizeof(t), &a->address);
  67
  68             avahi_log_info("Registering new address %s on %s.", t, a->interface->hardware->name);
  69
  70             if (avahi_server_add_address(m->server, a->entry_group, a->interface->hardware->index, a->interface->protocol, 0, NULL, &a->address) < 0) {
  71                 avahi_log_warn(__FILE__": avahi_server_add_address() failed: %s", avahi_strerror(m->server->error));
  72                 avahi_s_entry_group_free(a->entry_group);
  73                 a->entry_group = NULL;
  74                 return;
  75             }
  76
  77             avahi_s_entry_group_commit(a->entry_group);
  78         }
  79     } else {
  80
  81         /* Clear the entry group */
  82
  83         if (a->entry_group && !avahi_s_entry_group_is_empty(a->entry_group)) {
  84             char t[64];
  85             avahi_address_snprint(t, sizeof(t), &a->address);
  86
  87             if (avahi_s_entry_group_get_state(a->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING)
  88                 avahi_server_decrease_host_rr_pending(m->server);
  89
  90             avahi_log_info("Withdrawing address %s on %s.", t, a->interface->hardware->name);
  91
  92             avahi_s_entry_group_reset(a->entry_group);
  93         }
  94     }
  95 }
  96
  97 static void update_interface_rr(AvahiInterfaceMonitor *m, AvahiInterface *i, int remove_rrs) {
  98     AvahiInterfaceAddress *a;
  99
 100     assert(m);
 101     assert(i);
 102
 103     for (a = i->addresses; a; a = a->address_next)
 104         update_address_rr(m, a, remove_rrs);
 105 }
 106
 107 static void update_hw_interface_rr(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, int remove_rrs) {
 108     AvahiInterface *i;
 109
 110     assert(m);
 111     assert(hw);
 112
 113     for (i = hw->interfaces; i; i = i->by_hardware_next)
 114         update_interface_rr(m, i, remove_rrs);
 115
 116     if (m->list == LIST_DONE &&
 117         !remove_rrs &&
 118         m->server->config.publish_workstation &&
 119         (m->server->state == AVAHI_SERVER_RUNNING ||
 120         m->server->state == AVAHI_SERVER_REGISTERING)) {
 121
 122         if (!hw->entry_group)
 123             hw->entry_group = avahi_s_entry_group_new(m->server, avahi_host_rr_entry_group_callback, NULL);
 124
 125         if (!hw->entry_group)
 126             return; /* OOM */
 127
 128         if (avahi_s_entry_group_is_empty(hw->entry_group)) {
 129             char *name;
 130             char *t;
 131
 132             if (!(t = avahi_format_mac_address(hw->mac_address, hw->mac_address_size)))
 133                 return; /* OOM */
 134
 135             name = avahi_strdup_printf("%s [%s]", m->server->host_name, t);
 136             avahi_free(t);
 137
 138             if (!name)
 139                 return; /* OOM */
 140
 141             if (avahi_server_add_service(m->server, hw->entry_group, hw->index, AVAHI_PROTO_UNSPEC, name, "_workstation._tcp", NULL, NULL, 9, NULL) < 0) {
 142                 avahi_log_warn(__FILE__": avahi_server_add_service() failed.");
 143                 avahi_s_entry_group_free(hw->entry_group);
 144                 hw->entry_group = NULL;
 145             } else
 146                 avahi_s_entry_group_commit(hw->entry_group);
 147
 148             avahi_free(name);
 149         }
 150
 151     } else {
 152
 153         if (hw->entry_group && !avahi_s_entry_group_is_empty(hw->entry_group)) {
 154
 155             if (avahi_s_entry_group_get_state(hw->entry_group) == AVAHI_ENTRY_GROUP_REGISTERING)
 156                 avahi_server_decrease_host_rr_pending(m->server);
 157
 158             avahi_s_entry_group_reset(hw->entry_group);
 159         }
 160     }
 161 }
 162
 163 static void free_address(AvahiInterfaceMonitor *m, AvahiInterfaceAddress *a) {
 164     assert(m);
 165     assert(a);
 166     assert(a->interface);
 167
 168     update_address_rr(m, a, 1);
 169     AVAHI_LLIST_REMOVE(AvahiInterfaceAddress, address, a->interface->addresses, a);
 170
 171     if (a->entry_group)
 172         avahi_s_entry_group_free(a->entry_group);
 173
 174     avahi_free(a);
 175 }
 176
 177 static void free_interface(AvahiInterfaceMonitor *m, AvahiInterface *i, int send_goodbye) {
 178     assert(m);
 179     assert(i);
 180
 181     avahi_goodbye_interface(m->server, i, send_goodbye);
 182     avahi_response_scheduler_force(i->response_scheduler);
 183
 184     assert(!i->announcements);
 185
 186     update_interface_rr(m, i, 1);
 187
 188     while (i->addresses)
 189         free_address(m, i->addresses);
 190
 191     avahi_response_scheduler_free(i->response_scheduler);
 192     avahi_query_scheduler_free(i->query_scheduler);
 193     avahi_probe_scheduler_free(i->probe_scheduler);
 194     avahi_cache_free(i->cache);
 195
 196     AVAHI_LLIST_REMOVE(AvahiInterface, interface, m->interfaces, i);
 197     AVAHI_LLIST_REMOVE(AvahiInterface, by_hardware, i->hardware->interfaces, i);
 198
 199     avahi_free(i);
 200 }
 201
 202 static void free_hw_interface(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, int send_goodbye) {
 203     assert(m);
 204     assert(hw);
 205
 206     update_hw_interface_rr(m, hw, 1);
 207
 208     while (hw->interfaces)
 209         free_interface(m, hw->interfaces, send_goodbye);
 210
 211     if (hw->entry_group)
 212         avahi_s_entry_group_free(hw->entry_group);
 213
 214     AVAHI_LLIST_REMOVE(AvahiHwInterface, hardware, m->hw_interfaces, hw);
 215     avahi_hashmap_remove(m->hashmap, &hw->index);
 216
 217     avahi_free(hw->name);
 218     avahi_free(hw);
 219 }
 220
 221 static AvahiInterfaceAddress* get_address(AvahiInterfaceMonitor *m, AvahiInterface *i, const AvahiAddress *raddr) {
 222     AvahiInterfaceAddress *ia;
 223
 224     assert(m);
 225     assert(i);
 226     assert(raddr);
 227
 228     for (ia = i->addresses; ia; ia = ia->address_next)
 229         if (avahi_address_cmp(&ia->address, raddr) == 0)
 230             return ia;
 231
 232     return NULL;
 233 }
 234
 235 static int netlink_list_items(AvahiNetlink *nl, uint16_t type, unsigned *ret_seq) {
 236     struct nlmsghdr *n;
 237     struct rtgenmsg *gen;
 238     uint8_t req[1024];
 239
 240     memset(&req, 0, sizeof(req));
 241     n = (struct nlmsghdr*) req;
 242     n->nlmsg_len = NLMSG_LENGTH(sizeof(struct rtgenmsg));
 243     n->nlmsg_type = type;
 244     n->nlmsg_flags = NLM_F_ROOT/*|NLM_F_MATCH*/|NLM_F_REQUEST;
 245     n->nlmsg_pid = 0;
 246
 247     gen = NLMSG_DATA(n);
 248     memset(gen, 0, sizeof(struct rtgenmsg));
 249     gen->rtgen_family = AF_UNSPEC;
 250
 251     return avahi_netlink_send(nl, n, ret_seq);
 252 }
 253
 254 static void new_interface(AvahiInterfaceMonitor *m, AvahiHwInterface *hw, AvahiProtocol protocol) {
 255     AvahiInterface *i;
 256
 257     assert(m);
 258     assert(hw);
 259     assert(protocol != AVAHI_PROTO_UNSPEC);
 260
 261     if (!(i = avahi_new(AvahiInterface, 1)))
 262         goto fail; /* OOM */
 263
 264     i->monitor = m;
 265     i->hardware = hw;
 266     i->protocol = protocol;
 267     i->announcing = 0;
 268
 269     AVAHI_LLIST_HEAD_INIT(AvahiInterfaceAddress, i->addresses);
 270     AVAHI_LLIST_HEAD_INIT(AvahiAnnouncement, i->announcements);
 271
 272     i->cache = avahi_cache_new(m->server, i);
 273     i->response_scheduler = avahi_response_scheduler_new(i);
 274     i->query_scheduler = avahi_query_scheduler_new(i);
 275     i->probe_scheduler = avahi_probe_scheduler_new(i);
 276
 277     if (!i->cache || !i->response_scheduler || !i->query_scheduler || !i->probe_scheduler)
 278         goto fail; /* OOM */
 279
 280     AVAHI_LLIST_PREPEND(AvahiInterface, by_hardware, hw->interfaces, i);
 281     AVAHI_LLIST_PREPEND(AvahiInterface, interface, m->interfaces, i);
 282
 283     return;
 284 fail:
 285
 286     if (i) {
 287         if (i->cache)
 288             avahi_cache_free(i->cache);
 289         if (i->response_scheduler)
 290             avahi_response_scheduler_free(i->response_scheduler);
 291         if (i->query_scheduler)
 292             avahi_query_scheduler_free(i->query_scheduler);
 293         if (i->probe_scheduler)
 294             avahi_probe_scheduler_free(i->probe_scheduler);
 295     }
 296
 297 }
 298
 299 static void check_interface_relevant(AvahiInterfaceMonitor *m, AvahiInterface *i) {
 300     int b;
 301
 302     assert(m);
 303     assert(i);
 304
 305     b = avahi_interface_relevant(i);
 306
 307     if (m->list == LIST_DONE && b && !i->announcing) {
 308         avahi_log_info("New relevant interface %s.%i.", i->hardware->name, i->protocol);
 309
 310         if (i->protocol == AVAHI_PROTO_INET)
 311             avahi_mdns_mcast_join_ipv4(m->server->fd_ipv4, i->hardware->index);
 312         if (i->protocol == AVAHI_PROTO_INET6)
 313             avahi_mdns_mcast_join_ipv6(m->server->fd_ipv6, i->hardware->index);
 314
 315         i->announcing = 1;
 316         avahi_announce_interface(m->server, i);
 317         avahi_browser_new_interface(m->server, i);
 318     } else if (!b && i->announcing) {
 319         avahi_log_info("Interface %s.%i no longer relevant.", i->hardware->name, i->protocol);
 320
 321         if (i->protocol == AVAHI_PROTO_INET)
 322             avahi_mdns_mcast_leave_ipv4(m->server->fd_ipv4, i->hardware->index);
 323         if (i->protocol == AVAHI_PROTO_INET6)
 324             avahi_mdns_mcast_leave_ipv6(m->server->fd_ipv6, i->hardware->index);
 325
 326         avahi_goodbye_interface(m->server, i, 0);
 327         avahi_response_scheduler_clear(i->response_scheduler);
 328         avahi_query_scheduler_clear(i->query_scheduler);
 329         avahi_probe_scheduler_clear(i->probe_scheduler);
 330         avahi_cache_flush(i->cache);
 331
 332         i->announcing = 0;
 333     }
 334 }
 335
 336 static void check_hw_interface_relevant(AvahiInterfaceMonitor *m, AvahiHwInterface *hw) {
 337     AvahiInterface *i;
 338
 339     assert(m);
 340     assert(hw);
 341
 342     for (i = hw->interfaces; i; i = i->by_hardware_next)
 343         check_interface_relevant(m, i);
 344 }
 345
 346 static void check_all_interfaces_relevant(AvahiInterfaceMonitor *m) {
 347     AvahiInterface *i;
 348     assert(m);
 349
 350     for (i = m->interfaces; i; i = i->interface_next)
 351         check_interface_relevant(m, i);
 352 }
 353
 354 static void netlink_callback(AvahiNetlink *nl, struct nlmsghdr *n, void* userdata) {
 355     AvahiInterfaceMonitor *m = userdata;
 356
 357     assert(m);
 358     assert(n);
 359     assert(m->netlink == nl);
 360
 361     if (n->nlmsg_type == RTM_NEWLINK) {
 362         struct ifinfomsg *ifinfomsg = NLMSG_DATA(n);
 363         AvahiHwInterface *hw;
 364         struct rtattr *a = NULL;
 365         size_t l;
 366
 367         if (ifinfomsg->ifi_family != AF_UNSPEC)
 368             return;
 369
 370         if (!(hw = avahi_hashmap_lookup(m->hashmap, &ifinfomsg->ifi_index))) {
 371
 372             if (!(hw = avahi_new(AvahiHwInterface, 1)))
 373                 return; /* OOM */
 374
 375             hw->monitor = m;
 376             hw->name = NULL;
 377             hw->flags = 0;
 378             hw->mtu = 1500;
 379             hw->index = (AvahiIfIndex) ifinfomsg->ifi_index;
 380             hw->mac_address_size = 0;
 381             hw->entry_group = NULL;
 382
 383             AVAHI_LLIST_HEAD_INIT(AvahiInterface, hw->interfaces);
 384             AVAHI_LLIST_PREPEND(AvahiHwInterface, hardware, m->hw_interfaces, hw);
 385
 386             avahi_hashmap_insert(m->hashmap, &hw->index, hw);
 387
 388             if (m->server->fd_ipv4 >= 0)
 389                 new_interface(m, hw, AVAHI_PROTO_INET);
 390             if (m->server->fd_ipv6 >= 0)
 391                 new_interface(m, hw, AVAHI_PROTO_INET6);
 392         }
 393
 394         hw->flags = ifinfomsg->ifi_flags;
 395
 396         l = NLMSG_PAYLOAD(n, sizeof(struct ifinfomsg));
 397         a = IFLA_RTA(ifinfomsg);
 398
 399         while (RTA_OK(a, l)) {
 400             switch(a->rta_type) {
 401                 case IFLA_IFNAME:
 402                     avahi_free(hw->name);
 403                     hw->name = avahi_strndup(RTA_DATA(a), RTA_PAYLOAD(a));
 404                     break;
 405
 406                 case IFLA_MTU:
 407                     assert(RTA_PAYLOAD(a) == sizeof(unsigned int));
 408                     hw->mtu = *((unsigned int*) RTA_DATA(a));
 409                     break;
 410
 411                 case IFLA_ADDRESS: {
 412                     hw->mac_address_size = RTA_PAYLOAD(a);
 413                     if (hw->mac_address_size > AVAHI_MAX_MAC_ADDRESS)
 414                         hw->mac_address_size = AVAHI_MAX_MAC_ADDRESS;
 415
 416                     memcpy(hw->mac_address, RTA_DATA(a), hw->mac_address_size);
 417                     break;
 418                 }
 419
 420                 default:
 421                     ;
 422             }
 423
 424             a = RTA_NEXT(a, l);
 425         }
 426
 427         check_hw_interface_relevant(m, hw);
 428         update_hw_interface_rr(m, hw, 0);
 429
 430     } else if (n->nlmsg_type == RTM_DELLINK) {
 431         struct ifinfomsg *ifinfomsg = NLMSG_DATA(n);
 432         AvahiHwInterface *hw;
 433
 434         if (ifinfomsg->ifi_family != AF_UNSPEC)
 435             return;
 436
 437         if (!(hw = avahi_interface_monitor_get_hw_interface(m, (AvahiIfIndex) ifinfomsg->ifi_index)))
 438             return;
 439
 440         free_hw_interface(m, hw, 0);
 441
 442     } else if (n->nlmsg_type == RTM_NEWADDR || n->nlmsg_type == RTM_DELADDR) {
 443
 444         struct ifaddrmsg *ifaddrmsg = NLMSG_DATA(n);
 445         AvahiInterface *i;
 446         struct rtattr *a = NULL;
 447         size_t l;
 448         AvahiAddress raddr;
 449         int raddr_valid = 0;
 450
 451         if (ifaddrmsg->ifa_family != AVAHI_PROTO_INET && ifaddrmsg->ifa_family != AVAHI_PROTO_INET6)
 452             return;
 453
 454         if (!(i = (AvahiInterface*) avahi_interface_monitor_get_interface(m, (AvahiIfIndex) ifaddrmsg->ifa_index, (AvahiProtocol) ifaddrmsg->ifa_family)))
 455             return;
 456
 457         raddr.family = (AvahiProtocol) ifaddrmsg->ifa_family;
 458
 459         l = NLMSG_PAYLOAD(n, sizeof(struct ifaddrmsg));
 460         a = IFA_RTA(ifaddrmsg);
 461
 462         while (RTA_OK(a, l)) {
 463
 464             switch(a->rta_type) {
 465                 case IFA_ADDRESS:
 466                     if ((raddr.family == AVAHI_PROTO_INET6 && RTA_PAYLOAD(a) != 16) ||
 467                         (raddr.family == AVAHI_PROTO_INET && RTA_PAYLOAD(a) != 4))
 468                         return;
 469
 470                     memcpy(raddr.data.data, RTA_DATA(a), RTA_PAYLOAD(a));
 471                     raddr_valid = 1;
 472
 473                     break;
 474
 475                 default:
 476                     ;
 477             }
 478
 479             a = RTA_NEXT(a, l);
 480         }
 481
 482         if (!raddr_valid)
 483             return;
 484
 485         if (n->nlmsg_type == RTM_NEWADDR) {
 486             AvahiInterfaceAddress *addr;
 487
 488             if (!(addr = get_address(m, i, &raddr))) {
 489                 if (!(addr = avahi_new(AvahiInterfaceAddress, 1)))
 490                     return; /* OOM */
 491
 492                 addr->monitor = m;
 493                 addr->address = raddr;
 494                 addr->interface = i;
 495                 addr->entry_group = NULL;
 496
 497                 AVAHI_LLIST_PREPEND(AvahiInterfaceAddress, address, i->addresses, addr);
 498             }
 499
 500             addr->flags = ifaddrmsg->ifa_flags;
 501             addr->scope = ifaddrmsg->ifa_scope;
 502             addr->prefix_len = ifaddrmsg->ifa_prefixlen;
 503         } else {
 504             AvahiInterfaceAddress *addr;
 505
 506             if (!(addr = get_address(m, i, &raddr)))
 507                 return;
 508
 509             free_address(m, addr);
 510         }
 511
 512         check_interface_relevant(m, i);
 513         update_interface_rr(m, i, 0);
 514
 515     } else if (n->nlmsg_type == NLMSG_DONE) {
 516
 517         if (m->list == LIST_IFACE) {
 518
 519             if (netlink_list_items(m->netlink, RTM_GETADDR, &m->query_addr_seq) < 0) {
 520                 avahi_log_warn("NETLINK: Failed to list addrs: %s", strerror(errno));
 521                 m->list = LIST_DONE;
 522             } else
 523                 m->list = LIST_ADDR;
 524
 525         } else
 526             /* We're through */
 527             m->list = LIST_DONE;
 528
 529         if (m->list == LIST_DONE) {
 530             check_all_interfaces_relevant(m);
 531             avahi_update_host_rrs(m, 0);
 532             avahi_log_info("Network interface enumeration completed.");
 533         }
 534
 535     } else if (n->nlmsg_type == NLMSG_ERROR && (n->nlmsg_seq == m->query_link_seq || n->nlmsg_seq == m->query_addr_seq)) {
 536         struct nlmsgerr *e = NLMSG_DATA (n);
 537
 538         if (e->error)
 539             avahi_log_warn("NETLINK: Failed to browse: %s", strerror(-e->error));
 540     }
 541 }
 542
 543 AvahiInterfaceMonitor *avahi_interface_monitor_new(AvahiServer *s) {
 544     AvahiInterfaceMonitor *m = NULL;
 545
 546     if (!(m = avahi_new0(AvahiInterfaceMonitor, 1)))
 547         return NULL; /* OOM */
 548
 549     m->server = s;
 550     if (!(m->netlink = avahi_netlink_new(s->poll_api, RTMGRP_LINK|RTMGRP_IPV4_IFADDR|RTMGRP_IPV6_IFADDR, netlink_callback, m)))
 551         goto fail;
 552
 553     m->hashmap = avahi_hashmap_new(avahi_int_hash, avahi_int_equal, NULL, NULL);
 554
 555     AVAHI_LLIST_HEAD_INIT(AvahiInterface, m->interfaces);
 556     AVAHI_LLIST_HEAD_INIT(AvahiHwInterface, m->hw_interfaces);
 557
 558     if (netlink_list_items(m->netlink, RTM_GETLINK, &m->query_link_seq) < 0)
 559         goto fail;
 560
 561     m->list = LIST_IFACE;
 562
 563     return m;
 564
 565 fail:
 566     avahi_interface_monitor_free(m);
 567     return NULL;
 568 }
 569
 570 void avahi_interface_monitor_sync(AvahiInterfaceMonitor *m) {
 571     assert(m);
 572
 573     while (m->list != LIST_DONE) {
 574         if (!avahi_netlink_work(m->netlink, 1))
 575             break;
 576     }
 577 }
 578
 579 void avahi_interface_monitor_free(AvahiInterfaceMonitor *m) {
 580     assert(m);
 581
 582     while (m->hw_interfaces)
 583         free_hw_interface(m, m->hw_interfaces, 1);
 584
 585     assert(!m->interfaces);
 586
 587
 588     if (m->netlink)
 589         avahi_netlink_free(m->netlink);
 590
 591     if (m->hashmap)
 592         avahi_hashmap_free(m->hashmap);
 593
 594     avahi_free(m);
 595 }
 596
 597
 598 AvahiInterface* avahi_interface_monitor_get_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx, AvahiProtocol protocol) {
 599     AvahiHwInterface *hw;
 600     AvahiInterface *i;
 601
 602     assert(m);
 603     assert(idx > 0);
 604     assert(protocol != AVAHI_PROTO_UNSPEC);
 605
 606     if (!(hw = avahi_interface_monitor_get_hw_interface(m, idx)))
 607         return NULL;
 608
 609     for (i = hw->interfaces; i; i = i->by_hardware_next)
 610         if (i->protocol == protocol)
 611             return i;
 612
 613     return NULL;
 614 }
 615
 616 AvahiHwInterface* avahi_interface_monitor_get_hw_interface(AvahiInterfaceMonitor *m, AvahiIfIndex idx) {
 617     assert(m);
 618     assert(idx > 0);
 619
 620     return avahi_hashmap_lookup(m->hashmap, &idx);
 621 }
 622
 623 void avahi_interface_send_packet_unicast(AvahiInterface *i, AvahiDnsPacket *p, const AvahiAddress *a, uint16_t port) {
 624     assert(i);
 625     assert(p);
 626 /*     char t[64]; */
 627
 628     if (!avahi_interface_relevant(i))
 629         return;
 630
 631     assert(!a || a->family == i->protocol);
 632
 633 /*     if (a) */
 634 /*         avahi_log_debug("unicast sending on '%s.%i' to %s:%u", i->hardware->name, i->protocol, avahi_address_snprint(t, sizeof(t), a), port); */
 635 /*     else */
 636 /*         avahi_log_debug("multicast sending on '%s.%i'", i->hardware->name, i->protocol); */
 637
 638     if (i->protocol == AVAHI_PROTO_INET && i->monitor->server->fd_ipv4 >= 0)
 639         avahi_send_dns_packet_ipv4(i->monitor->server->fd_ipv4, i->hardware->index, p, a ? &a->data.ipv4 : NULL, port);
 640     else if (i->protocol == AVAHI_PROTO_INET6 && i->monitor->server->fd_ipv6 >= 0)
 641         avahi_send_dns_packet_ipv6(i->monitor->server->fd_ipv6, i->hardware->index, p, a ? &a->data.ipv6 : NULL, port);
 642 }
 643
 644 void avahi_interface_send_packet(AvahiInterface *i, AvahiDnsPacket *p) {
 645     assert(i);
 646     assert(p);
 647
 648     avahi_interface_send_packet_unicast(i, p, NULL, 0);
 649 }
 650
 651 int avahi_interface_post_query(AvahiInterface *i, AvahiKey *key, int immediately) {
 652     assert(i);
 653     assert(key);
 654
 655     if (avahi_interface_relevant(i))
 656         return avahi_query_scheduler_post(i->query_scheduler, key, immediately);
 657
 658     return 0;
 659 }
 660
 661 int avahi_interface_post_response(AvahiInterface *i, AvahiRecord *record, int flush_cache, const AvahiAddress *querier, int immediately) {
 662     assert(i);
 663     assert(record);
 664
 665     if (avahi_interface_relevant(i))
 666         return avahi_response_scheduler_post(i->response_scheduler, record, flush_cache, querier, immediately);
 667
 668     return 0;
 669 }
 670
 671 int avahi_interface_post_probe(AvahiInterface *i, AvahiRecord *record, int immediately) {
 672     assert(i);
 673     assert(record);
 674
 675     if (avahi_interface_relevant(i))
 676         return avahi_probe_scheduler_post(i->probe_scheduler, record, immediately);
 677
 678     return 0;
 679 }
 680
 681 int avahi_dump_caches(AvahiInterfaceMonitor *m, AvahiDumpCallback callback, void* userdata) {
 682     AvahiInterface *i;
 683     assert(m);
 684
 685     for (i = m->interfaces; i; i = i->interface_next) {
 686         if (avahi_interface_relevant(i)) {
 687             char ln[256];
 688             snprintf(ln, sizeof(ln), ";;; INTERFACE %s.%i ;;;", i->hardware->name, i->protocol);
 689             callback(ln, userdata);
 690             if (avahi_cache_dump(i->cache, callback, userdata) < 0)
 691                 return -1;
 692         }
 693     }
 694
 695     return 0;
 696 }
 697
 698 int avahi_interface_relevant(AvahiInterface *i) {
 699     AvahiInterfaceAddress *a;
 700     int relevant_address;
 701
 702     assert(i);
 703
 704     relevant_address = 0;
 705
 706     for (a = i->addresses; a; a = a->address_next)
 707         if (avahi_interface_address_relevant(a)) {
 708             relevant_address = 1;
 709             break;
 710         }
 711
 712 /*     avahi_log_debug("%p. iface-relevant: %i %i %i %i %i %i", i, relevant_address, */
 713 /*               (i->hardware->flags & IFF_UP), */
 714 /*               (i->hardware->flags & IFF_RUNNING), */
 715 /*               !(i->hardware->flags & IFF_LOOPBACK), */
 716 /*               (i->hardware->flags & IFF_MULTICAST), */
 717 /*               !(i->hardware->flags & IFF_POINTOPOINT)); */
 718
 719     return
 720         (i->hardware->flags & IFF_UP) &&
 721         (!i->monitor->server->config.use_iff_running || (i->hardware->flags & IFF_RUNNING)) &&
 722         !(i->hardware->flags & IFF_LOOPBACK) &&
 723         (i->hardware->flags & IFF_MULTICAST) &&
 724         !(i->hardware->flags & IFF_POINTOPOINT) &&
 725         relevant_address;
 726 }
 727
 728 int avahi_interface_address_relevant(AvahiInterfaceAddress *a) {
 729     AvahiInterfaceAddress *b;
 730     assert(a);
 731
 732     /* Publish public IP addresses */
 733     if (a->scope == RT_SCOPE_UNIVERSE ||
 734         a->scope == RT_SCOPE_SITE)
 735         return 1;
 736
 737     if (a->scope == RT_SCOPE_LINK) {
 738
 739         /* Publish link local IP addresses if they are the only ones on the link */
 740         for (b = a->interface->addresses; b; b = b->address_next) {
 741             if (b == a)
 742                 continue;
 743
 744             if (b->scope == RT_SCOPE_UNIVERSE ||
 745                 b->scope == RT_SCOPE_SITE)
 746                 return 0;
 747         }
 748
 749         return 1;
 750     }
 751
 752     return 0;
 753 }
 754
 755 int avahi_interface_match(AvahiInterface *i, AvahiIfIndex idx, AvahiProtocol protocol) {
 756     assert(i);
 757
 758     if (idx > 0 && idx != i->hardware->index)
 759         return 0;
 760
 761     if (protocol != AVAHI_PROTO_UNSPEC && protocol != i->protocol)
 762         return 0;
 763
 764     return 1;
 765 }
 766
 767 void avahi_interface_monitor_walk(AvahiInterfaceMonitor *m, AvahiIfIndex interface, AvahiProtocol protocol, AvahiInterfaceMonitorWalkCallback callback, void* userdata) {
 768     assert(m);
 769     assert(callback);
 770
 771     if (interface > 0) {
 772         if (protocol != AVAHI_PROTO_UNSPEC) {
 773             AvahiInterface *i;
 774
 775             if ((i = avahi_interface_monitor_get_interface(m, interface, protocol)))
 776                 callback(m, i, userdata);
 777
 778         } else {
 779             AvahiHwInterface *hw;
 780             AvahiInterface *i;
 781
 782             if ((hw = avahi_interface_monitor_get_hw_interface(m, interface)))
 783                 for (i = hw->interfaces; i; i = i->by_hardware_next)
 784                     if (avahi_interface_match(i, interface, protocol))
 785                         callback(m, i, userdata);
 786         }
 787
 788     } else {
 789         AvahiInterface *i;
 790
 791         for (i = m->interfaces; i; i = i->interface_next)
 792             if (avahi_interface_match(i, interface, protocol))
 793                 callback(m, i, userdata);
 794     }
 795 }
 796
 797 void avahi_update_host_rrs(AvahiInterfaceMonitor *m, int remove_rrs) {
 798     AvahiHwInterface *hw;
 799
 800     assert(m);
 801
 802     for (hw = m->hw_interfaces; hw; hw = hw->hardware_next)
 803         update_hw_interface_rr(m, hw, remove_rrs);
 804 }
 805
 806 int avahi_address_is_local(AvahiInterfaceMonitor *m, const AvahiAddress *a) {
 807     AvahiInterface *i;
 808     AvahiInterfaceAddress *ia;
 809     assert(m);
 810     assert(a);
 811
 812     for (i = m->interfaces; i; i = i->interface_next)
 813         for (ia = i->addresses; ia; ia = ia->address_next)
 814             if (avahi_address_cmp(a, &ia->address) == 0)
 815                 return 1;
 816
 817     return 0;
 818 }
 819
 820 int avahi_interface_address_on_link(AvahiInterface *i, const AvahiAddress *a) {
 821     AvahiInterfaceAddress *ia;
 822
 823     assert(i);
 824     assert(a);
 825
 826     if (a->family != i->protocol)
 827         return 0;
 828
 829     for (ia = i->addresses; ia; ia = ia->address_next) {
 830
 831         if (a->family == AVAHI_PROTO_INET) {
 832             uint32_t m;
 833
 834             m = ~(((uint32_t) -1) >> ia->prefix_len);
 835
 836             if ((ntohl(a->data.ipv4.address) & m) == (ntohl(ia->address.data.ipv4.address) & m))
 837                 return 1;
 838         } else {
 839             unsigned j;
 840             unsigned char pl;
 841             assert(a->family == AVAHI_PROTO_INET6);
 842
 843             pl = ia->prefix_len;
 844
 845             for (j = 0; j < 16; j++) {
 846                 uint8_t m;
 847
 848                 if (pl == 0)
 849                     return 1;
 850
 851                 if (pl >= 8) {
 852                     m = 0xFF;
 853                     pl -= 8;
 854                 } else {
 855                     m = ~(0xFF >> pl);
 856                     pl = 0;
 857                 }
 858
 859                 if ((a->data.ipv6.address[j] & m) != (ia->address.data.ipv6.address[j] & m))
 860                     break;
 861             }
 862         }
 863     }
 864
 865     return 0;
 866 }
 867
 868 int avahi_interface_has_address(AvahiInterfaceMonitor *m, AvahiIfIndex iface, const AvahiAddress *a) {
 869     AvahiInterface *i;
 870     AvahiInterfaceAddress *j;
 871
 872     assert(m);
 873     assert(iface != AVAHI_IF_UNSPEC);
 874     assert(a);
 875
 876     if (!(i = avahi_interface_monitor_get_interface(m, iface, a->family)))
 877         return 0;
 878
 879     for (j = i->addresses; j; j = j->address_next)
 880         if (avahi_address_cmp(a, &j->address) == 0)
 881             return 1;
 882
 883     return 0;
 884 }