interface.c

   1 /*
   2  * Copyright (C) 2014 John Crispin <blogic@openwrt.org>
   3  * Copyright (C) 2014 Felix Fietkau <nbd@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU Lesser General Public License version 2.1
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #define _GNU_SOURCE
  16 #include <sys/socket.h>
  17 #include <sys/ioctl.h>
  18 #include <sys/types.h>
  19 #include <sys/stat.h>
  20 #include <sys/utsname.h>
  21 #include <net/if.h>
  22 #include <netinet/in.h>
  23 #include <arpa/inet.h>
  24 #include <sys/types.h>
  25
  26 #include <ifaddrs.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <unistd.h>
  30 #include <stdio.h>
  31 #include <errno.h>
  32
  33 #include <libubox/usock.h>
  34 #include <libubox/uloop.h>
  35 #include <libubox/avl-cmp.h>
  36 #include <libubox/utils.h>
  37 #include "interface.h"
  38 #include "util.h"
  39 #include "dns.h"
  40 #include "announce.h"
  41 #include "service.h"
  42
  43 static int
  44 interface_send_packet4(struct interface *iface, struct iovec *iov, int iov_len)
  45 {
  46         static size_t cmsg_data[( CMSG_SPACE(sizeof(struct in_pktinfo)) / sizeof(size_t)) + 1];
  47         static struct sockaddr_in a;
  48         static struct msghdr m = {
  49                 .msg_name = (struct sockaddr *) &a,
  50                 .msg_namelen = sizeof(a),
  51                 .msg_control = cmsg_data,
  52                 .msg_controllen = CMSG_LEN(sizeof(struct in_pktinfo)),
  53         };
  54         struct in_pktinfo *pkti;
  55         struct cmsghdr *cmsg;
  56         int fd = iface->fd.fd;
  57
  58         a.sin_family = AF_INET;
  59         a.sin_port = htons(MCAST_PORT);
  60         m.msg_iov = iov;
  61         m.msg_iovlen = iov_len;
  62
  63         memset(cmsg_data, 0, sizeof(cmsg_data));
  64         cmsg = CMSG_FIRSTHDR(&m);
  65         cmsg->cmsg_len = m.msg_controllen;
  66         cmsg->cmsg_level = IPPROTO_IP;
  67         cmsg->cmsg_type = IP_PKTINFO;
  68
  69         pkti = (struct in_pktinfo*) CMSG_DATA(cmsg);
  70         pkti->ipi_ifindex = iface->ifindex;
  71
  72         a.sin_addr.s_addr = inet_addr(MCAST_ADDR);
  73
  74         return sendmsg(fd, &m, 0);
  75 }
  76
  77 static int
  78 interface_send_packet6(struct interface *iface, struct iovec *iov, int iov_len)
  79 {
  80         static size_t cmsg_data[( CMSG_SPACE(sizeof(struct in6_pktinfo)) / sizeof(size_t)) + 1];
  81         static struct sockaddr_in6 a;
  82         static struct msghdr m = {
  83                 .msg_name = (struct sockaddr *) &a,
  84                 .msg_namelen = sizeof(a),
  85                 .msg_control = cmsg_data,
  86                 .msg_controllen = CMSG_LEN(sizeof(struct in6_pktinfo)),
  87         };
  88         struct in6_pktinfo *pkti;
  89         struct cmsghdr *cmsg;
  90         int fd = iface->fd.fd;
  91
  92         a.sin6_family = AF_INET6;
  93         a.sin6_port = htons(MCAST_PORT);
  94         m.msg_iov = iov;
  95         m.msg_iovlen = iov_len;
  96
  97         memset(cmsg_data, 0, sizeof(cmsg_data));
  98         cmsg = CMSG_FIRSTHDR(&m);
  99         cmsg->cmsg_len = m.msg_controllen;
 100         cmsg->cmsg_level = IPPROTO_IPV6;
 101         cmsg->cmsg_type = IPV6_PKTINFO;
 102
 103         pkti = (struct in6_pktinfo*) CMSG_DATA(cmsg);
 104         pkti->ipi6_ifindex = iface->ifindex;
 105
 106         inet_pton(AF_INET6, MCAST_ADDR6, &a.sin6_addr);
 107
 108         return sendmsg(fd, &m, 0);
 109 }
 110
 111 int
 112 interface_send_packet(struct interface *iface, struct iovec *iov, int iov_len)
 113 {
 114         if (debug > 1) {
 115                 fprintf(stderr, "TX ipv%d: %s\n", iface->v6 * 2 + 4, iface->name);
 116                 fprintf(stderr, "  multicast: %d\n", iface->multicast);
 117         }
 118
 119         if (iface->v6)
 120                 return interface_send_packet6(iface, iov, iov_len);
 121
 122         return interface_send_packet4(iface, iov, iov_len);
 123 }
 124
 125 static void interface_close(struct interface *iface)
 126 {
 127         if (iface->fd.fd < 0)
 128                 return;
 129
 130         announce_free(iface);
 131         uloop_fd_delete(&iface->fd);
 132         close(iface->fd.fd);
 133         iface->fd.fd = -1;
 134 }
 135
 136 static void interface_free(struct interface *iface)
 137 {
 138         interface_close(iface);
 139         free(iface);
 140 }
 141
 142 static void
 143 read_socket4(struct uloop_fd *u, unsigned int events)
 144 {
 145         struct interface *iface = container_of(u, struct interface, fd);
 146         static uint8_t buffer[8 * 1024];
 147         struct iovec iov[1];
 148         char cmsg[CMSG_SPACE(sizeof(struct in_pktinfo)) + CMSG_SPACE(sizeof(int)) + 1];
 149         struct cmsghdr *cmsgptr;
 150         struct msghdr msg;
 151         socklen_t len;
 152         struct sockaddr_in from;
 153         int flags = 0, ifindex = -1;
 154         uint8_t ttl = 0;
 155         struct in_pktinfo *inp = NULL;
 156
 157         if (u->eof) {
 158                 interface_close(iface);
 159                 uloop_timeout_set(&iface->reconnect, 1000);
 160                 return;
 161         }
 162
 163         iov[0].iov_base = buffer;
 164         iov[0].iov_len = sizeof(buffer);
 165
 166         memset(&msg, 0, sizeof(msg));
 167         msg.msg_name = (struct sockaddr *) &from;
 168         msg.msg_namelen = sizeof(struct sockaddr_in);
 169         msg.msg_iov = iov;
 170         msg.msg_iovlen = 1;
 171         msg.msg_control = &cmsg;
 172         msg.msg_controllen = sizeof(cmsg);
 173
 174         len = recvmsg(u->fd, &msg, flags);
 175         if (len == -1) {
 176                 perror("read failed");
 177                 return;
 178         }
 179         for (cmsgptr = CMSG_FIRSTHDR(&msg); cmsgptr != NULL; cmsgptr = CMSG_NXTHDR(&msg, cmsgptr)) {
 180                 void *c = CMSG_DATA(cmsgptr);
 181
 182                 switch (cmsgptr->cmsg_type) {
 183                 case IP_PKTINFO:
 184                         inp = ((struct in_pktinfo *) c);
 185                         break;
 186
 187                 case IP_TTL:
 188                         ttl = (uint8_t) *((int *) c);
 189                         break;
 190
 191                 default:
 192                         fprintf(stderr, "unknown cmsg %x\n", cmsgptr->cmsg_type);
 193                         return;
 194                 }
 195         }
 196
 197         if (ttl != 255)
 198                 return;
 199
 200         if (debug > 1) {
 201                 char buf[256];
 202
 203                 fprintf(stderr, "RX ipv4: %s\n", iface->name);
 204                 fprintf(stderr, "  multicast: %d\n", iface->multicast);
 205                 inet_ntop(AF_INET, &from.sin_addr, buf, 256);
 206                 fprintf(stderr, "  src %s:%d\n", buf, from.sin_port);
 207                 inet_ntop(AF_INET, &inp->ipi_spec_dst, buf, 256);
 208                 fprintf(stderr, "  dst %s\n", buf);
 209                 inet_ntop(AF_INET, &inp->ipi_addr, buf, 256);
 210                 fprintf(stderr, "  real %s\n", buf);
 211         }
 212
 213         if (inp->ipi_ifindex != iface->ifindex)
 214                 fprintf(stderr, "invalid iface index %d != %d\n", ifindex, iface->ifindex);
 215         else
 216                 dns_handle_packet(iface, (struct sockaddr *) &from, from.sin_port, buffer, len);
 217 }
 218
 219 static void
 220 read_socket6(struct uloop_fd *u, unsigned int events)
 221 {
 222         struct interface *iface = container_of(u, struct interface, fd);
 223         static uint8_t buffer[8 * 1024];
 224         struct iovec iov[1];
 225         char cmsg6[CMSG_SPACE(sizeof(struct in6_pktinfo)) + CMSG_SPACE(sizeof(int)) + 1];
 226         struct cmsghdr *cmsgptr;
 227         struct msghdr msg;
 228         socklen_t len;
 229         struct sockaddr_in6 from;
 230         int flags = 0, ifindex = -1;
 231         int ttl = 0;
 232         struct in6_pktinfo *inp = NULL;
 233
 234         if (u->eof) {
 235                 interface_close(iface);
 236                 uloop_timeout_set(&iface->reconnect, 1000);
 237                 return;
 238         }
 239
 240         iov[0].iov_base = buffer;
 241         iov[0].iov_len = sizeof(buffer);
 242
 243         memset(&msg, 0, sizeof(msg));
 244         msg.msg_name = (struct sockaddr *) &from;
 245         msg.msg_namelen = sizeof(struct sockaddr_in6);
 246         msg.msg_iov = iov;
 247         msg.msg_iovlen = 1;
 248         msg.msg_control = &cmsg6;
 249         msg.msg_controllen = sizeof(cmsg6);
 250
 251         len = recvmsg(u->fd, &msg, flags);
 252         if (len == -1) {
 253                 perror("read failed");
 254                 return;
 255         }
 256         for (cmsgptr = CMSG_FIRSTHDR(&msg); cmsgptr != NULL; cmsgptr = CMSG_NXTHDR(&msg, cmsgptr)) {
 257                 void *c = CMSG_DATA(cmsgptr);
 258
 259                 switch (cmsgptr->cmsg_type) {
 260                 case IPV6_PKTINFO:
 261                         inp = ((struct in6_pktinfo *) c);
 262                         break;
 263
 264                 case IPV6_HOPLIMIT:
 265                         ttl = (uint8_t) *((int *) c);
 266                         break;
 267
 268                 default:
 269                         fprintf(stderr, "unknown cmsg %x\n", cmsgptr->cmsg_type);
 270                         return;
 271                 }
 272         }
 273
 274         if (ttl != 255)
 275                 return;
 276
 277         if (debug > 1) {
 278                 char buf[256];
 279
 280                 fprintf(stderr, "RX ipv6: %s\n", iface->name);
 281                 fprintf(stderr, "  multicast: %d\n", iface->multicast);
 282                 inet_ntop(AF_INET6, &from.sin6_addr, buf, 256);
 283                 fprintf(stderr, "  src %s:%d\n", buf, from.sin6_port);
 284                 inet_ntop(AF_INET6, &inp->ipi6_addr, buf, 256);
 285                 fprintf(stderr, "  dst %s\n", buf);
 286         }
 287
 288         if (inp->ipi6_ifindex != iface->ifindex)
 289                 fprintf(stderr, "invalid iface index %d != %d\n", ifindex, iface->ifindex);
 290         else
 291                 dns_handle_packet(iface, (struct sockaddr *) &from, from.sin6_port, buffer, len);
 292 }
 293
 294 static int
 295 interface_mcast_setup4(struct interface *iface)
 296 {
 297         struct ip_mreqn mreq;
 298         uint8_t ttl = 255;
 299         int no = 0;
 300         struct sockaddr_in sa = { 0 };
 301         int fd = iface->fd.fd;
 302
 303         sa.sin_family = AF_INET;
 304         sa.sin_port = htons(MCAST_PORT);
 305         inet_pton(AF_INET, MCAST_ADDR, &sa.sin_addr);
 306
 307         memset(&mreq, 0, sizeof(mreq));
 308         mreq.imr_address.s_addr = iface->v4_addr.s_addr;
 309         mreq.imr_multiaddr = sa.sin_addr;
 310         mreq.imr_ifindex = iface->ifindex;
 311
 312         if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) < 0)
 313                 fprintf(stderr, "ioctl failed: IP_MULTICAST_TTL\n");
 314
 315         /* Some network drivers have issues with dropping membership of
 316          * mcast groups when the iface is down, but don't allow rejoining
 317          * when it comes back up. This is an ugly workaround
 318          * -- this was copied from avahi --
 319          */
 320         setsockopt(fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, &mreq, sizeof(mreq));
 321
 322         if (setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) {
 323                 fprintf(stderr, "failed to join multicast group: %s\n", strerror(errno));
 324                 close(fd);
 325                 fd = -1;
 326                 return -1;
 327         }
 328
 329         if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &no, sizeof(no)) < 0)
 330                 fprintf(stderr, "ioctl failed: IP_MULTICAST_LOOP\n");
 331
 332         return 0;
 333 }
 334
 335 static int
 336 interface_socket_setup6(struct interface *iface)
 337 {
 338         struct ipv6_mreq mreq;
 339         int ttl = 255;
 340         int no = 0;
 341         struct sockaddr_in6 sa = { 0 };
 342         int fd = iface->fd.fd;
 343
 344         sa.sin6_family = AF_INET6;
 345         sa.sin6_port = htons(MCAST_PORT);
 346         inet_pton(AF_INET6, MCAST_ADDR6, &sa.sin6_addr);
 347
 348         memset(&mreq, 0, sizeof(mreq));
 349         mreq.ipv6mr_multiaddr = sa.sin6_addr;
 350         mreq.ipv6mr_interface = iface->ifindex;
 351
 352         if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl)) < 0)
 353                 fprintf(stderr, "ioctl failed: IPV6_MULTICAST_HOPS\n");
 354
 355         setsockopt(fd, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq, sizeof(mreq));
 356         if (setsockopt(fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) {
 357                 fprintf(stderr, "failed to join multicast group: %s\n", strerror(errno));
 358                 close(fd);
 359                 fd = -1;
 360                 return -1;
 361         }
 362
 363         if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &no, sizeof(no)) < 0)
 364                 fprintf(stderr, "ioctl failed: IPV6_MULTICAST_LOOP\n");
 365
 366         return 0;
 367 }
 368
 369 static void
 370 reconnect_socket4(struct uloop_timeout *timeout)
 371 {
 372         struct interface *iface = container_of(timeout, struct interface, reconnect);
 373         int yes = 1;
 374
 375         iface->fd.fd = usock(USOCK_UDP | USOCK_SERVER | USOCK_NONBLOCK | USOCK_IPV4ONLY,
 376                 (iface->multicast) ? (iface->mcast_addr) : (iface->v4_addrs), "5353");
 377         if (iface->fd.fd < 0) {
 378                 fprintf(stderr, "failed to add listener %s: %s\n", iface->mcast_addr, strerror(errno));
 379                 goto retry;
 380         }
 381
 382         if (setsockopt(iface->fd.fd, SOL_SOCKET, SO_BINDTODEVICE, iface->name, strlen(iface->name) < 0))
 383                 fprintf(stderr, "ioctl failed: SO_BINDTODEVICE\n");
 384
 385         if (setsockopt(iface->fd.fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0)
 386                 fprintf(stderr, "ioctl failed: SO_REUSEADDR\n");
 387
 388         if (setsockopt(iface->fd.fd, IPPROTO_IP, IP_RECVTTL, &yes, sizeof(yes)) < 0)
 389                 fprintf(stderr, "ioctl failed: IP_RECVTTL\n");
 390
 391         if (setsockopt(iface->fd.fd, IPPROTO_IP, IP_PKTINFO, &yes, sizeof(yes)) < 0)
 392                 fprintf(stderr, "ioctl failed: IP_PKTINFO\n");
 393
 394         if (iface->multicast && interface_mcast_setup4(iface)) {
 395                 iface->fd.fd = -1;
 396                 goto retry;
 397         }
 398
 399         uloop_fd_add(&iface->fd, ULOOP_READ);
 400         if (iface->multicast) {
 401                 dns_send_question(iface, "_services._dns-sd._udp.local", TYPE_PTR, 1);
 402                 announce_init(iface);
 403         }
 404
 405         return;
 406
 407 retry:
 408         uloop_timeout_set(timeout, 1000);
 409 }
 410
 411 static void
 412 reconnect_socket6(struct uloop_timeout *timeout)
 413 {
 414         struct interface *iface = container_of(timeout, struct interface, reconnect);
 415         char mcast_addr[128];
 416         int ttl = 255;
 417         int yes = 1;
 418
 419         snprintf(mcast_addr, sizeof(mcast_addr), "%s%%%s", (iface->multicast) ? (iface->mcast_addr) : (iface->v6_addrs), iface->name);
 420         iface->fd.fd = usock(USOCK_UDP | USOCK_SERVER | USOCK_NONBLOCK | USOCK_IPV6ONLY, mcast_addr, "5353");
 421         if (iface->fd.fd < 0) {
 422                 fprintf(stderr, "failed to add listener %s: %s\n", mcast_addr, strerror(errno));
 423                 goto retry;
 424         }
 425
 426         if (setsockopt(iface->fd.fd, SOL_SOCKET, SO_BINDTODEVICE, iface->name, strlen(iface->name) < 0))
 427                 fprintf(stderr, "ioctl failed: SO_BINDTODEVICE\n");
 428
 429         if (setsockopt(iface->fd.fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)) < 0)
 430                 fprintf(stderr, "ioctl failed: IPV6_UNICAST_HOPS\n");
 431
 432         if (setsockopt(iface->fd.fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &yes, sizeof(yes)) < 0)
 433                 fprintf(stderr, "ioctl failed: IPV6_RECVPKTINFO\n");
 434
 435         if (setsockopt(iface->fd.fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &yes, sizeof(yes)) < 0)
 436                 fprintf(stderr, "ioctl failed: IPV6_RECVHOPLIMIT\n");
 437
 438         if (setsockopt(iface->fd.fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0)
 439                 fprintf(stderr, "ioctl failed: SO_REUSEADDR\n");
 440
 441         if (iface->multicast && interface_socket_setup6(iface)) {
 442                 iface->fd.fd = -1;
 443                 goto retry;
 444         }
 445
 446         uloop_fd_add(&iface->fd, ULOOP_READ);
 447
 448         if (iface->multicast) {
 449                 dns_send_question(iface, "_services._dns-sd._udp.local", TYPE_PTR, 1);
 450                 announce_init(iface);
 451         }
 452
 453         return;
 454
 455 retry:
 456         uloop_timeout_set(timeout, 1000);
 457 }
 458
 459
 460 static void interface_start(struct interface *iface)
 461 {
 462         if (iface->v6) {
 463                 iface->fd.cb = read_socket6;
 464                 iface->reconnect.cb = reconnect_socket6;
 465         } else {
 466                 iface->fd.cb = read_socket4;
 467                 iface->reconnect.cb = reconnect_socket4;
 468         }
 469         uloop_timeout_set(&iface->reconnect, 100);
 470 }
 471
 472 static void
 473 iface_update_cb(struct vlist_tree *tree, struct vlist_node *node_new,
 474                 struct vlist_node *node_old)
 475 {
 476         struct interface *iface;
 477
 478         if (node_old) {
 479                 iface = container_of(node_old, struct interface, node);
 480                 interface_free(iface);
 481         }
 482
 483         if (node_new) {
 484                 iface = container_of(node_new, struct interface, node);
 485                 interface_start(iface);
 486         }
 487 }
 488
 489 static struct interface* _interface_add(const char *name, int multicast, int v6)
 490 {
 491         struct interface *iface;
 492         char *name_buf;
 493         char *id_buf;
 494
 495         iface = calloc_a(sizeof(*iface),
 496                 &name_buf, strlen(name) + 1,
 497                 &id_buf, strlen(name) + 5);
 498
 499         sprintf(id_buf, "%d_%d_%s", multicast, v6, name);
 500         iface->name = strcpy(name_buf, name);
 501         iface->id = id_buf;
 502         iface->ifindex = if_nametoindex(name);
 503         iface->fd.fd = -1;
 504         iface->multicast = multicast;
 505         iface->v6 = v6;
 506         if (v6)
 507                 iface->mcast_addr = MCAST_ADDR6;
 508         else
 509                 iface->mcast_addr = MCAST_ADDR;
 510
 511         if (iface->ifindex <= 0)
 512                 goto error;
 513
 514         vlist_add(&interfaces, &iface->node, iface->id);
 515         return iface;
 516
 517 error:
 518         free(iface);
 519         return NULL;
 520 }
 521
 522 int interface_add(const char *name)
 523 {
 524         struct interface *v4 = NULL, *v6 = NULL, *unicast;
 525         struct ifaddrs *ifap, *ifa;
 526
 527         getifaddrs(&ifap);
 528
 529         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 530                 if (strcmp(ifa->ifa_name, name))
 531                         continue;
 532                 if (ifa->ifa_addr->sa_family == AF_INET && !v4) {
 533                         struct sockaddr_in *sa;
 534
 535                         if (cfg_proto && (cfg_proto != 4))
 536                                 continue;
 537
 538                         unicast = _interface_add(name, 0, 0);
 539                         if (!unicast)
 540                                 continue;
 541                         sa = (struct sockaddr_in *) ifa->ifa_addr;
 542                         memcpy(&unicast->v4_addr, &sa->sin_addr, sizeof(unicast->v4_addr));
 543                         inet_ntop(AF_INET, &sa->sin_addr, unicast->v4_addrs, sizeof(unicast->v4_addrs));
 544
 545                         v4 = _interface_add(name, 1, 0);
 546                         if (!v4)
 547                                 continue;
 548                         memcpy(&v4->v4_addr, &sa->sin_addr, sizeof(v4->v4_addr));
 549                         inet_ntop(AF_INET, &sa->sin_addr, v4->v4_addrs, sizeof(v4->v4_addrs));
 550
 551                         v4->peer = unicast;
 552                         unicast->peer = v4;
 553                 }
 554
 555                 if (ifa->ifa_addr->sa_family == AF_INET6 && !v6) {
 556                         uint8_t ll_prefix[] = {0xfe, 0x80 };
 557                         struct sockaddr_in6 *sa6;
 558
 559                         if (cfg_proto && (cfg_proto != 6))
 560                                 continue;
 561
 562                         sa6 = (struct sockaddr_in6 *) ifa->ifa_addr;
 563                         if (memcmp(&sa6->sin6_addr, &ll_prefix, 2))
 564                                 continue;
 565
 566                         unicast = _interface_add(name, 0, 1);
 567                         if (!unicast)
 568                                 continue;
 569                         memcpy(&unicast->v6_addr, &sa6->sin6_addr, sizeof(unicast->v6_addr));
 570                         inet_ntop(AF_INET6, &sa6->sin6_addr, unicast->v6_addrs, sizeof(unicast->v6_addrs));
 571
 572                         v6 = _interface_add(name, 1, 1);
 573                         if (!v6)
 574                                 continue;
 575                         memcpy(&v6->v6_addr, &sa6->sin6_addr, sizeof(v6->v6_addr));
 576                         inet_ntop(AF_INET6, &sa6->sin6_addr, v6->v6_addrs, sizeof(v6->v6_addrs));
 577
 578                         v6->peer = unicast;
 579                         unicast->peer = v6;
 580                 }
 581         }
 582
 583         freeifaddrs(ifap);
 584
 585         return !v4 && !v6;
 586 }
 587
 588 void interface_shutdown(void)
 589 {
 590         struct interface *iface;
 591
 592         vlist_for_each_element(&interfaces, iface, node)
 593                 if (iface->fd.fd > 0 && iface->multicast) {
 594                         service_announce(iface, 0);
 595                         service_reply_a(iface, 0);
 596                 }
 597         vlist_for_each_element(&interfaces, iface, node)
 598                 interface_close(iface);
 599 }
 600
 601 VLIST_TREE(interfaces, avl_strcmp, iface_update_cb, false, false);