Take the target address family in account when determining the family of
[libav.git] / libavformat / udp.c
1 /*
2 * UDP prototype streaming system
3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard.
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21 #include "avformat.h"
22 #include <unistd.h>
23 #include "network.h"
24
25 #ifndef IPV6_ADD_MEMBERSHIP
26 #define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
27 #define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
28 #endif
29
30 typedef struct {
31 int udp_fd;
32 int ttl;
33 int is_multicast;
34 int local_port;
35 int reuse_socket;
36 #ifndef CONFIG_IPV6
37 struct ip_mreq mreq;
38 struct sockaddr_in dest_addr;
39 #else
40 struct sockaddr_storage dest_addr;
41 size_t dest_addr_len;
42 #endif
43 } UDPContext;
44
45 #define UDP_TX_BUF_SIZE 32768
46 #define UDP_MAX_PKT_SIZE 65536
47
48 #ifdef CONFIG_IPV6
49
50 static int udp_ipv6_set_multicast_ttl(int sockfd, int mcastTTL, struct sockaddr *addr) {
51 if (addr->sa_family == AF_INET) {
52 if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
53 perror("setsockopt(IP_MULTICAST_TTL)");
54 return -1;
55 }
56 }
57 if (addr->sa_family == AF_INET6) {
58 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
59 perror("setsockopt(IPV6_MULTICAST_HOPS)");
60 return -1;
61 }
62 }
63 return 0;
64 }
65
66 static int udp_ipv6_join_multicast_group(int sockfd, struct sockaddr *addr) {
67 struct ip_mreq mreq;
68 struct ipv6_mreq mreq6;
69 if (addr->sa_family == AF_INET) {
70 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
71 mreq.imr_interface.s_addr= INADDR_ANY;
72 if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
73 perror("setsockopt(IP_ADD_MEMBERSHIP)");
74 return -1;
75 }
76 }
77 if (addr->sa_family == AF_INET6) {
78 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
79 mreq6.ipv6mr_interface= 0;
80 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
81 perror("setsockopt(IPV6_ADD_MEMBERSHIP)");
82 return -1;
83 }
84 }
85 return 0;
86 }
87
88 static int udp_ipv6_leave_multicast_group(int sockfd, struct sockaddr *addr) {
89 struct ip_mreq mreq;
90 struct ipv6_mreq mreq6;
91 if (addr->sa_family == AF_INET) {
92 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
93 mreq.imr_interface.s_addr= INADDR_ANY;
94 if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
95 perror("setsockopt(IP_DROP_MEMBERSHIP)");
96 return -1;
97 }
98 }
99 if (addr->sa_family == AF_INET6) {
100 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
101 mreq6.ipv6mr_interface= 0;
102 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
103 perror("setsockopt(IPV6_DROP_MEMBERSHIP)");
104 return -1;
105 }
106 }
107 return 0;
108 }
109
110 static struct addrinfo* udp_ipv6_resolve_host(const char *hostname, int port, int type, int family, int flags) {
111 struct addrinfo hints, *res = 0;
112 int error;
113 char sport[16];
114 const char *node = 0, *service = "0";
115
116 if (port > 0) {
117 snprintf(sport, sizeof(sport), "%d", port);
118 service = sport;
119 }
120 if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
121 node = hostname;
122 }
123 memset(&hints, 0, sizeof(hints));
124 hints.ai_socktype = type;
125 hints.ai_family = family;
126 hints.ai_flags = flags;
127 if ((error = getaddrinfo(node, service, &hints, &res))) {
128 av_log(NULL, AV_LOG_ERROR, "udp_ipv6_resolve_host: %s\n", gai_strerror(error));
129 }
130
131 return res;
132 }
133
134 static int udp_ipv6_set_remote_url(URLContext *h, const char *uri) {
135 UDPContext *s = h->priv_data;
136 char hostname[256];
137 int port;
138 struct addrinfo *res0;
139 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
140 res0 = udp_ipv6_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
141 if (res0 == 0) return AVERROR(EIO);
142 memcpy(&s->dest_addr, res0->ai_addr, res0->ai_addrlen);
143 s->dest_addr_len = res0->ai_addrlen;
144 freeaddrinfo(res0);
145 return 0;
146 }
147
148 static int udp_ipv6_set_local(URLContext *h) {
149 UDPContext *s = h->priv_data;
150 int udp_fd = -1;
151 struct sockaddr_storage clientaddr;
152 socklen_t addrlen;
153 char sbuf[NI_MAXSERV];
154 char hbuf[NI_MAXHOST];
155 struct addrinfo *res0 = NULL, *res = NULL;
156 int family = AF_UNSPEC;
157
158 if (((struct sockaddr *) &s->dest_addr)->sa_family)
159 family = ((struct sockaddr *) &s->dest_addr)->sa_family;
160 res0 = udp_ipv6_resolve_host(0, s->local_port, SOCK_DGRAM, family, AI_PASSIVE);
161 if (res0 == 0)
162 goto fail;
163 for (res = res0; res; res=res->ai_next) {
164 udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
165 if (udp_fd > 0) break;
166 perror("socket");
167 }
168
169 if (udp_fd < 0)
170 goto fail;
171
172 if (bind(udp_fd, res0->ai_addr, res0->ai_addrlen) < 0) {
173 perror("bind");
174 goto fail;
175 }
176 freeaddrinfo(res0);
177 res0 = NULL;
178
179 addrlen = sizeof(clientaddr);
180 if (getsockname(udp_fd, (struct sockaddr *)&clientaddr, &addrlen) < 0) {
181 perror("getsockname");
182 goto fail;
183 }
184
185 if (getnameinfo((struct sockaddr *)&clientaddr, addrlen, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
186 perror("getnameinfo");
187 goto fail;
188 }
189
190 s->local_port = strtol(sbuf, NULL, 10);
191
192 return udp_fd;
193
194 fail:
195 if (udp_fd >= 0)
196 closesocket(udp_fd);
197 if(res0)
198 freeaddrinfo(res0);
199 return -1;
200 }
201
202 #endif /* CONFIG_IPV6 */
203
204
205 /**
206 * If no filename is given to av_open_input_file because you want to
207 * get the local port first, then you must call this function to set
208 * the remote server address.
209 *
210 * url syntax: udp://host:port[?option=val...]
211 * option: 'multicast=1' : enable multicast
212 * 'ttl=n' : set the ttl value (for multicast only)
213 * 'localport=n' : set the local port
214 * 'pkt_size=n' : set max packet size
215 * 'reuse=1' : enable reusing the socket
216 *
217 * @param s1 media file context
218 * @param uri of the remote server
219 * @return zero if no error.
220 */
221 int udp_set_remote_url(URLContext *h, const char *uri)
222 {
223 #ifdef CONFIG_IPV6
224 return udp_ipv6_set_remote_url(h, uri);
225 #else
226 UDPContext *s = h->priv_data;
227 char hostname[256];
228 int port;
229
230 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
231
232 /* set the destination address */
233 if (resolve_host(&s->dest_addr.sin_addr, hostname) < 0)
234 return AVERROR(EIO);
235 s->dest_addr.sin_family = AF_INET;
236 s->dest_addr.sin_port = htons(port);
237 return 0;
238 #endif
239 }
240
241 /**
242 * Return the local port used by the UDP connexion
243 * @param s1 media file context
244 * @return the local port number
245 */
246 int udp_get_local_port(URLContext *h)
247 {
248 UDPContext *s = h->priv_data;
249 return s->local_port;
250 }
251
252 /**
253 * Return the udp file handle for select() usage to wait for several RTP
254 * streams at the same time.
255 * @param h media file context
256 */
257 int udp_get_file_handle(URLContext *h)
258 {
259 UDPContext *s = h->priv_data;
260 return s->udp_fd;
261 }
262
263 /* put it in UDP context */
264 /* return non zero if error */
265 static int udp_open(URLContext *h, const char *uri, int flags)
266 {
267 char hostname[1024];
268 int port, udp_fd = -1, tmp;
269 UDPContext *s = NULL;
270 int is_output;
271 const char *p;
272 char buf[256];
273 #ifndef CONFIG_IPV6
274 struct sockaddr_in my_addr, my_addr1;
275 int len;
276 #endif
277
278 h->is_streamed = 1;
279 h->max_packet_size = 1472;
280
281 is_output = (flags & URL_WRONLY);
282
283 s = av_mallocz(sizeof(UDPContext));
284 if (!s)
285 return AVERROR(ENOMEM);
286
287 h->priv_data = s;
288 s->ttl = 16;
289 s->is_multicast = 0;
290 s->local_port = 0;
291 s->reuse_socket = 0;
292 p = strchr(uri, '?');
293 if (p) {
294 s->is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
295 s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
296 if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
297 s->ttl = strtol(buf, NULL, 10);
298 }
299 if (find_info_tag(buf, sizeof(buf), "localport", p)) {
300 s->local_port = strtol(buf, NULL, 10);
301 }
302 if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
303 h->max_packet_size = strtol(buf, NULL, 10);
304 }
305 }
306
307 /* fill the dest addr */
308 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
309
310 /* XXX: fix url_split */
311 if (hostname[0] == '\0' || hostname[0] == '?') {
312 /* only accepts null hostname if input */
313 if (s->is_multicast || (flags & URL_WRONLY))
314 goto fail;
315 } else {
316 udp_set_remote_url(h, uri);
317 }
318
319 if(!ff_network_init())
320 return AVERROR(EIO);
321
322 #ifndef CONFIG_IPV6
323 udp_fd = socket(AF_INET, SOCK_DGRAM, 0);
324 if (udp_fd < 0)
325 goto fail;
326
327 my_addr.sin_family = AF_INET;
328 my_addr.sin_addr.s_addr = htonl (INADDR_ANY);
329 if (s->is_multicast && !(h->flags & URL_WRONLY)) {
330 /* special case: the bind must be done on the multicast address port */
331 my_addr.sin_port = s->dest_addr.sin_port;
332 } else {
333 my_addr.sin_port = htons(s->local_port);
334 }
335
336 if (s->reuse_socket)
337 if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
338 goto fail;
339
340 /* the bind is needed to give a port to the socket now */
341 if (bind(udp_fd,(struct sockaddr *)&my_addr, sizeof(my_addr)) < 0)
342 goto fail;
343
344 len = sizeof(my_addr1);
345 getsockname(udp_fd, (struct sockaddr *)&my_addr1, &len);
346 s->local_port = ntohs(my_addr1.sin_port);
347
348 #ifdef IP_MULTICAST_TTL
349 if (s->is_multicast) {
350 if (h->flags & URL_WRONLY) {
351 /* output */
352 if (setsockopt(udp_fd, IPPROTO_IP, IP_MULTICAST_TTL,
353 &s->ttl, sizeof(s->ttl)) < 0) {
354 perror("IP_MULTICAST_TTL");
355 goto fail;
356 }
357 } else {
358 /* input */
359 memset(&s->mreq, 0, sizeof(s->mreq));
360 s->mreq.imr_multiaddr = s->dest_addr.sin_addr;
361 s->mreq.imr_interface.s_addr = htonl (INADDR_ANY);
362 if (setsockopt(udp_fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
363 &s->mreq, sizeof(s->mreq)) < 0) {
364 perror("rtp: IP_ADD_MEMBERSHIP");
365 goto fail;
366 }
367 }
368 }
369 #endif
370 #else
371 if (s->is_multicast && !(h->flags & URL_WRONLY))
372 s->local_port = port;
373 udp_fd = udp_ipv6_set_local(h);
374 if (udp_fd < 0)
375 goto fail;
376 if (s->is_multicast) {
377 if (h->flags & URL_WRONLY) {
378 if (udp_ipv6_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
379 goto fail;
380 } else {
381 if (udp_ipv6_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
382 goto fail;
383 }
384 }
385 #endif /* CONFIG_IPV6 */
386
387 if (is_output) {
388 /* limit the tx buf size to limit latency */
389 tmp = UDP_TX_BUF_SIZE;
390 if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
391 perror("setsockopt sndbuf");
392 goto fail;
393 }
394 } else {
395 /* set udp recv buffer size to the largest possible udp packet size to
396 * avoid losing data on OSes that set this too low by default. */
397 tmp = UDP_MAX_PKT_SIZE;
398 setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp));
399 }
400
401 s->udp_fd = udp_fd;
402 return 0;
403 fail:
404 if (udp_fd >= 0)
405 closesocket(udp_fd);
406 av_free(s);
407 return AVERROR(EIO);
408 }
409
410 static int udp_read(URLContext *h, uint8_t *buf, int size)
411 {
412 UDPContext *s = h->priv_data;
413 #ifndef CONFIG_IPV6
414 struct sockaddr_in from;
415 #else
416 struct sockaddr_storage from;
417 #endif
418 socklen_t from_len;
419 int len;
420
421 for(;;) {
422 from_len = sizeof(from);
423 len = recvfrom (s->udp_fd, buf, size, 0,
424 (struct sockaddr *)&from, &from_len);
425 if (len < 0) {
426 if (ff_neterrno() != FF_NETERROR(EAGAIN) &&
427 ff_neterrno() != FF_NETERROR(EINTR))
428 return AVERROR(EIO);
429 } else {
430 break;
431 }
432 }
433 return len;
434 }
435
436 static int udp_write(URLContext *h, uint8_t *buf, int size)
437 {
438 UDPContext *s = h->priv_data;
439 int ret;
440
441 for(;;) {
442 ret = sendto (s->udp_fd, buf, size, 0,
443 (struct sockaddr *) &s->dest_addr,
444 #ifndef CONFIG_IPV6
445 sizeof (s->dest_addr));
446 #else
447 s->dest_addr_len);
448 #endif
449 if (ret < 0) {
450 if (ff_neterrno() != FF_NETERROR(EINTR) &&
451 ff_neterrno() != FF_NETERROR(EAGAIN))
452 return AVERROR(EIO);
453 } else {
454 break;
455 }
456 }
457 return size;
458 }
459
460 static int udp_close(URLContext *h)
461 {
462 UDPContext *s = h->priv_data;
463
464 #ifndef CONFIG_IPV6
465 #ifdef IP_DROP_MEMBERSHIP
466 if (s->is_multicast && !(h->flags & URL_WRONLY)) {
467 if (setsockopt(s->udp_fd, IPPROTO_IP, IP_DROP_MEMBERSHIP,
468 &s->mreq, sizeof(s->mreq)) < 0) {
469 perror("IP_DROP_MEMBERSHIP");
470 }
471 }
472 #endif
473 #else
474 if (s->is_multicast && !(h->flags & URL_WRONLY))
475 udp_ipv6_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
476 #endif
477 closesocket(s->udp_fd);
478 ff_network_close();
479 av_free(s);
480 return 0;
481 }
482
483 URLProtocol udp_protocol = {
484 "udp",
485 udp_open,
486 udp_read,
487 udp_write,
488 NULL, /* seek */
489 udp_close,
490 };