Check correct attributes when loading service from blob
[project/mdnsd.git] / 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 int
143 interface_valid_src(void *ip1, void *mask, void *ip2, int len)
144 {
145 uint8_t *i1 = ip1;
146 uint8_t *i2 = ip2;
147 uint8_t *m = mask;
148 int i;
149
150 if (cfg_no_subnet)
151 return 0;
152
153 for (i = 0; i < len; i++, i1++, i2++, m++) {
154 if ((*i1 & *m) != (*i2 & *m))
155 return -1;
156 }
157
158 return 0;
159 }
160
161 static void
162 read_socket4(struct uloop_fd *u, unsigned int events)
163 {
164 struct interface *iface = container_of(u, struct interface, fd);
165 static uint8_t buffer[8 * 1024];
166 struct iovec iov[1];
167 char cmsg[CMSG_SPACE(sizeof(struct in_pktinfo)) + CMSG_SPACE(sizeof(int)) + 1];
168 struct cmsghdr *cmsgptr;
169 struct msghdr msg;
170 socklen_t len;
171 struct sockaddr_in from;
172 int flags = 0, ifindex = -1;
173 uint8_t ttl = 0;
174 struct in_pktinfo *inp = NULL;
175
176 if (u->eof) {
177 interface_close(iface);
178 uloop_timeout_set(&iface->reconnect, 1000);
179 return;
180 }
181
182 iov[0].iov_base = buffer;
183 iov[0].iov_len = sizeof(buffer);
184
185 memset(&msg, 0, sizeof(msg));
186 msg.msg_name = (struct sockaddr *) &from;
187 msg.msg_namelen = sizeof(struct sockaddr_in);
188 msg.msg_iov = iov;
189 msg.msg_iovlen = 1;
190 msg.msg_control = &cmsg;
191 msg.msg_controllen = sizeof(cmsg);
192
193 len = recvmsg(u->fd, &msg, flags);
194 if (len == -1) {
195 perror("read failed");
196 return;
197 }
198 for (cmsgptr = CMSG_FIRSTHDR(&msg); cmsgptr != NULL; cmsgptr = CMSG_NXTHDR(&msg, cmsgptr)) {
199 void *c = CMSG_DATA(cmsgptr);
200
201 switch (cmsgptr->cmsg_type) {
202 case IP_PKTINFO:
203 inp = ((struct in_pktinfo *) c);
204 break;
205
206 case IP_TTL:
207 ttl = (uint8_t) *((int *) c);
208 break;
209
210 default:
211 fprintf(stderr, "unknown cmsg %x\n", cmsgptr->cmsg_type);
212 return;
213 }
214 }
215
216 if (ttl != 255)
217 return;
218
219 if (debug > 1) {
220 char buf[256];
221
222 fprintf(stderr, "RX ipv4: %s\n", iface->name);
223 fprintf(stderr, " multicast: %d\n", iface->multicast);
224 inet_ntop(AF_INET, &from.sin_addr, buf, 256);
225 fprintf(stderr, " src %s:%d\n", buf, from.sin_port);
226 inet_ntop(AF_INET, &inp->ipi_spec_dst, buf, 256);
227 fprintf(stderr, " dst %s\n", buf);
228 inet_ntop(AF_INET, &inp->ipi_addr, buf, 256);
229 fprintf(stderr, " real %s\n", buf);
230 }
231
232 if (inp->ipi_ifindex != iface->ifindex)
233 fprintf(stderr, "invalid iface index %d != %d\n", ifindex, iface->ifindex);
234 else if (!interface_valid_src((void *) &iface->v4_addr, (void *) &iface->v4_netmask, (void *) &from.sin_addr, 4))
235 dns_handle_packet(iface, (struct sockaddr *) &from, from.sin_port, buffer, len);
236 }
237
238 static void
239 read_socket6(struct uloop_fd *u, unsigned int events)
240 {
241 struct interface *iface = container_of(u, struct interface, fd);
242 static uint8_t buffer[8 * 1024];
243 struct iovec iov[1];
244 char cmsg6[CMSG_SPACE(sizeof(struct in6_pktinfo)) + CMSG_SPACE(sizeof(int)) + 1];
245 struct cmsghdr *cmsgptr;
246 struct msghdr msg;
247 socklen_t len;
248 struct sockaddr_in6 from;
249 int flags = 0, ifindex = -1;
250 int ttl = 0;
251 struct in6_pktinfo *inp = NULL;
252
253 if (u->eof) {
254 interface_close(iface);
255 uloop_timeout_set(&iface->reconnect, 1000);
256 return;
257 }
258
259 iov[0].iov_base = buffer;
260 iov[0].iov_len = sizeof(buffer);
261
262 memset(&msg, 0, sizeof(msg));
263 msg.msg_name = (struct sockaddr *) &from;
264 msg.msg_namelen = sizeof(struct sockaddr_in6);
265 msg.msg_iov = iov;
266 msg.msg_iovlen = 1;
267 msg.msg_control = &cmsg6;
268 msg.msg_controllen = sizeof(cmsg6);
269
270 len = recvmsg(u->fd, &msg, flags);
271 if (len == -1) {
272 perror("read failed");
273 return;
274 }
275 for (cmsgptr = CMSG_FIRSTHDR(&msg); cmsgptr != NULL; cmsgptr = CMSG_NXTHDR(&msg, cmsgptr)) {
276 void *c = CMSG_DATA(cmsgptr);
277
278 switch (cmsgptr->cmsg_type) {
279 case IPV6_PKTINFO:
280 inp = ((struct in6_pktinfo *) c);
281 break;
282
283 case IPV6_HOPLIMIT:
284 ttl = (uint8_t) *((int *) c);
285 break;
286
287 default:
288 fprintf(stderr, "unknown cmsg %x\n", cmsgptr->cmsg_type);
289 return;
290 }
291 }
292
293 if (ttl != 255)
294 return;
295
296 if (debug > 1) {
297 char buf[256];
298
299 fprintf(stderr, "RX ipv6: %s\n", iface->name);
300 fprintf(stderr, " multicast: %d\n", iface->multicast);
301 inet_ntop(AF_INET6, &from.sin6_addr, buf, 256);
302 fprintf(stderr, " src %s:%d\n", buf, from.sin6_port);
303 inet_ntop(AF_INET6, &inp->ipi6_addr, buf, 256);
304 fprintf(stderr, " dst %s\n", buf);
305 }
306
307 if (inp->ipi6_ifindex != iface->ifindex)
308 fprintf(stderr, "invalid iface index %d != %d\n", ifindex, iface->ifindex);
309 else if (!interface_valid_src((void *) &iface->v6_addr, (void *) &iface->v6_netmask, (void *) &from.sin6_addr, 16))
310 dns_handle_packet(iface, (struct sockaddr *) &from, from.sin6_port, buffer, len);
311 }
312
313 static int
314 interface_mcast_setup4(struct interface *iface)
315 {
316 struct ip_mreqn mreq;
317 uint8_t ttl = 255;
318 int no = 0;
319 struct sockaddr_in sa = { 0 };
320 int fd = iface->fd.fd;
321
322 sa.sin_family = AF_INET;
323 sa.sin_port = htons(MCAST_PORT);
324 inet_pton(AF_INET, MCAST_ADDR, &sa.sin_addr);
325
326 memset(&mreq, 0, sizeof(mreq));
327 mreq.imr_address.s_addr = iface->v4_addr.s_addr;
328 mreq.imr_multiaddr = sa.sin_addr;
329 mreq.imr_ifindex = iface->ifindex;
330
331 if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) < 0)
332 fprintf(stderr, "ioctl failed: IP_MULTICAST_TTL\n");
333
334 /* Some network drivers have issues with dropping membership of
335 * mcast groups when the iface is down, but don't allow rejoining
336 * when it comes back up. This is an ugly workaround
337 * -- this was copied from avahi --
338 */
339 setsockopt(fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, &mreq, sizeof(mreq));
340
341 if (setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) {
342 fprintf(stderr, "failed to join multicast group: %s\n", strerror(errno));
343 close(fd);
344 fd = -1;
345 return -1;
346 }
347
348 if (setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP, &no, sizeof(no)) < 0)
349 fprintf(stderr, "ioctl failed: IP_MULTICAST_LOOP\n");
350
351 return 0;
352 }
353
354 static int
355 interface_socket_setup6(struct interface *iface)
356 {
357 struct ipv6_mreq mreq;
358 int ttl = 255;
359 int no = 0;
360 struct sockaddr_in6 sa = { 0 };
361 int fd = iface->fd.fd;
362
363 sa.sin6_family = AF_INET6;
364 sa.sin6_port = htons(MCAST_PORT);
365 inet_pton(AF_INET6, MCAST_ADDR6, &sa.sin6_addr);
366
367 memset(&mreq, 0, sizeof(mreq));
368 mreq.ipv6mr_multiaddr = sa.sin6_addr;
369 mreq.ipv6mr_interface = iface->ifindex;
370
371 if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &ttl, sizeof(ttl)) < 0)
372 fprintf(stderr, "ioctl failed: IPV6_MULTICAST_HOPS\n");
373
374 setsockopt(fd, IPPROTO_IPV6, IPV6_LEAVE_GROUP, &mreq, sizeof(mreq));
375 if (setsockopt(fd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) {
376 fprintf(stderr, "failed to join multicast group: %s\n", strerror(errno));
377 close(fd);
378 fd = -1;
379 return -1;
380 }
381
382 if (setsockopt(fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP, &no, sizeof(no)) < 0)
383 fprintf(stderr, "ioctl failed: IPV6_MULTICAST_LOOP\n");
384
385 return 0;
386 }
387
388 static void
389 reconnect_socket4(struct uloop_timeout *timeout)
390 {
391 struct interface *iface = container_of(timeout, struct interface, reconnect);
392 int yes = 1;
393
394 iface->fd.fd = usock(USOCK_UDP | USOCK_SERVER | USOCK_NONBLOCK | USOCK_IPV4ONLY,
395 (iface->multicast) ? (iface->mcast_addr) : (iface->v4_addrs), "5353");
396 if (iface->fd.fd < 0) {
397 fprintf(stderr, "failed to add listener %s: %s\n", iface->mcast_addr, strerror(errno));
398 goto retry;
399 }
400
401 if (setsockopt(iface->fd.fd, SOL_SOCKET, SO_BINDTODEVICE, iface->name, strlen(iface->name) < 0))
402 fprintf(stderr, "ioctl failed: SO_BINDTODEVICE\n");
403
404 if (setsockopt(iface->fd.fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0)
405 fprintf(stderr, "ioctl failed: SO_REUSEADDR\n");
406
407 if (setsockopt(iface->fd.fd, IPPROTO_IP, IP_RECVTTL, &yes, sizeof(yes)) < 0)
408 fprintf(stderr, "ioctl failed: IP_RECVTTL\n");
409
410 if (setsockopt(iface->fd.fd, IPPROTO_IP, IP_PKTINFO, &yes, sizeof(yes)) < 0)
411 fprintf(stderr, "ioctl failed: IP_PKTINFO\n");
412
413 if (iface->multicast && interface_mcast_setup4(iface)) {
414 iface->fd.fd = -1;
415 goto retry;
416 }
417
418 uloop_fd_add(&iface->fd, ULOOP_READ);
419 if (iface->multicast) {
420 dns_send_question(iface, "_services._dns-sd._udp.local", TYPE_PTR, 0);
421 announce_init(iface);
422 }
423
424 return;
425
426 retry:
427 uloop_timeout_set(timeout, 1000);
428 }
429
430 static void
431 reconnect_socket6(struct uloop_timeout *timeout)
432 {
433 struct interface *iface = container_of(timeout, struct interface, reconnect);
434 char mcast_addr[128];
435 int ttl = 255;
436 int yes = 1;
437
438 snprintf(mcast_addr, sizeof(mcast_addr), "%s%%%s", (iface->multicast) ? (iface->mcast_addr) : (iface->v6_addrs), iface->name);
439 iface->fd.fd = usock(USOCK_UDP | USOCK_SERVER | USOCK_NONBLOCK | USOCK_IPV6ONLY, mcast_addr, "5353");
440 if (iface->fd.fd < 0) {
441 fprintf(stderr, "failed to add listener %s: %s\n", mcast_addr, strerror(errno));
442 goto retry;
443 }
444
445 if (setsockopt(iface->fd.fd, SOL_SOCKET, SO_BINDTODEVICE, iface->name, strlen(iface->name) < 0))
446 fprintf(stderr, "ioctl failed: SO_BINDTODEVICE\n");
447
448 if (setsockopt(iface->fd.fd, IPPROTO_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)) < 0)
449 fprintf(stderr, "ioctl failed: IPV6_UNICAST_HOPS\n");
450
451 if (setsockopt(iface->fd.fd, IPPROTO_IPV6, IPV6_RECVPKTINFO, &yes, sizeof(yes)) < 0)
452 fprintf(stderr, "ioctl failed: IPV6_RECVPKTINFO\n");
453
454 if (setsockopt(iface->fd.fd, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &yes, sizeof(yes)) < 0)
455 fprintf(stderr, "ioctl failed: IPV6_RECVHOPLIMIT\n");
456
457 if (setsockopt(iface->fd.fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0)
458 fprintf(stderr, "ioctl failed: SO_REUSEADDR\n");
459
460 if (iface->multicast && interface_socket_setup6(iface)) {
461 iface->fd.fd = -1;
462 goto retry;
463 }
464
465 uloop_fd_add(&iface->fd, ULOOP_READ);
466
467 if (iface->multicast) {
468 dns_send_question(iface, "_services._dns-sd._udp.local", TYPE_PTR, 0);
469 announce_init(iface);
470 }
471
472 return;
473
474 retry:
475 uloop_timeout_set(timeout, 1000);
476 }
477
478
479 static void interface_start(struct interface *iface)
480 {
481 if (iface->v6) {
482 iface->fd.cb = read_socket6;
483 iface->reconnect.cb = reconnect_socket6;
484 } else {
485 iface->fd.cb = read_socket4;
486 iface->reconnect.cb = reconnect_socket4;
487 }
488 uloop_timeout_set(&iface->reconnect, 100);
489 }
490
491 static void
492 iface_update_cb(struct vlist_tree *tree, struct vlist_node *node_new,
493 struct vlist_node *node_old)
494 {
495 struct interface *iface;
496
497 if (node_old) {
498 iface = container_of(node_old, struct interface, node);
499 interface_free(iface);
500 }
501
502 if (node_new) {
503 iface = container_of(node_new, struct interface, node);
504 interface_start(iface);
505 }
506 }
507
508 static struct interface* _interface_add(const char *name, int multicast, int v6)
509 {
510 struct interface *iface;
511 char *name_buf;
512 char *id_buf;
513
514 iface = calloc_a(sizeof(*iface),
515 &name_buf, strlen(name) + 1,
516 &id_buf, strlen(name) + 5);
517
518 sprintf(id_buf, "%d_%d_%s", multicast, v6, name);
519 iface->name = strcpy(name_buf, name);
520 iface->id = id_buf;
521 iface->ifindex = if_nametoindex(name);
522 iface->fd.fd = -1;
523 iface->multicast = multicast;
524 iface->v6 = v6;
525 if (v6)
526 iface->mcast_addr = MCAST_ADDR6;
527 else
528 iface->mcast_addr = MCAST_ADDR;
529
530 if (iface->ifindex <= 0)
531 goto error;
532
533 vlist_add(&interfaces, &iface->node, iface->id);
534 return iface;
535
536 error:
537 free(iface);
538 return NULL;
539 }
540
541 int interface_add(const char *name)
542 {
543 struct interface *v4 = NULL, *v6 = NULL, *unicast;
544 struct ifaddrs *ifap, *ifa;
545
546 getifaddrs(&ifap);
547
548 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
549 if (strcmp(ifa->ifa_name, name))
550 continue;
551 if (ifa->ifa_addr->sa_family == AF_INET && !v4) {
552 struct sockaddr_in *sa;
553
554 if (cfg_proto && (cfg_proto != 4))
555 continue;
556
557 unicast = _interface_add(name, 0, 0);
558 if (!unicast)
559 continue;
560 v4 = _interface_add(name, 1, 0);
561 if (!v4)
562 continue;
563
564 sa = (struct sockaddr_in *) ifa->ifa_addr;
565 memcpy(&v4->v4_addr, &sa->sin_addr, sizeof(v4->v4_addr));
566 memcpy(&unicast->v4_addr, &sa->sin_addr, sizeof(unicast->v4_addr));
567
568 inet_ntop(AF_INET, &sa->sin_addr, v4->v4_addrs, sizeof(v4->v4_addrs));
569 inet_ntop(AF_INET, &sa->sin_addr, unicast->v4_addrs, sizeof(unicast->v4_addrs));
570
571 sa = (struct sockaddr_in *) ifa->ifa_netmask;
572 memcpy(&unicast->v4_netmask, &sa->sin_addr, sizeof(unicast->v4_netmask));
573 memcpy(&v4->v4_netmask, &sa->sin_addr, sizeof(v4->v4_netmask));
574
575 v4->peer = unicast;
576 unicast->peer = v4;
577 }
578
579 if (ifa->ifa_addr->sa_family == AF_INET6 && !v6) {
580 uint8_t ll_prefix[] = {0xfe, 0x80 };
581 struct sockaddr_in6 *sa6;
582
583 if (cfg_proto && (cfg_proto != 6))
584 continue;
585
586 sa6 = (struct sockaddr_in6 *) ifa->ifa_addr;
587 if (memcmp(&sa6->sin6_addr, &ll_prefix, 2))
588 continue;
589
590 unicast = _interface_add(name, 0, 1);
591 if (!unicast)
592 continue;
593 v6 = _interface_add(name, 1, 1);
594 if (!v6)
595 continue;
596
597 memcpy(&v6->v6_addr, &sa6->sin6_addr, sizeof(v6->v6_addr));
598 memcpy(&unicast->v6_addr, &sa6->sin6_addr, sizeof(unicast->v6_addr));
599
600 inet_ntop(AF_INET6, &sa6->sin6_addr, v6->v6_addrs, sizeof(v6->v6_addrs));
601 inet_ntop(AF_INET6, &sa6->sin6_addr, unicast->v6_addrs, sizeof(unicast->v6_addrs));
602
603 sa6 = (struct sockaddr_in6 *) ifa->ifa_netmask;
604 memcpy(&v6->v6_netmask, &sa6->sin6_addr, sizeof(v6->v6_netmask));
605 memcpy(&unicast->v6_netmask, &sa6->sin6_addr, sizeof(unicast->v6_netmask));
606
607 v6->peer = unicast;
608 unicast->peer = v6;
609 }
610 }
611
612 freeifaddrs(ifap);
613
614 return !v4 && !v6;
615 }
616
617 void interface_shutdown(void)
618 {
619 struct interface *iface;
620
621 vlist_for_each_element(&interfaces, iface, node)
622 if (iface->fd.fd > 0 && iface->multicast) {
623 service_announce(iface, 0);
624 dns_reply_a(iface, 0);
625 }
626 vlist_for_each_element(&interfaces, iface, node)
627 interface_close(iface);
628 }
629
630 struct interface*
631 interface_get(const char *name, int v6, int multicast)
632 {
633 char id_buf[32];
634 snprintf(id_buf, sizeof(id_buf), "%d_%d_%s", multicast, v6, name);
635 struct interface *iface = vlist_find(&interfaces, id_buf, iface, node);
636 return iface;
637 }
638
639 VLIST_TREE(interfaces, avl_strcmp, iface_update_cb, false, false);