0d165d2f1cf0b3fe122840cc0d6a8734d98c05c5
[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 <sys/types.h>
24 #include <sys/socket.h>
25 #include <netinet/in.h>
26 #include <arpa/inet.h>
27 #include <netdb.h>
28
29 #ifndef IPV6_ADD_MEMBERSHIP
30 #define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
31 #define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
32 #endif
33
34 typedef struct {
35 int udp_fd;
36 int ttl;
37 int is_multicast;
38 int local_port;
39 int reuse_socket;
40 #ifndef CONFIG_IPV6
41 struct ip_mreq mreq;
42 struct sockaddr_in dest_addr;
43 #else
44 struct sockaddr_storage dest_addr;
45 size_t dest_addr_len;
46 #endif
47 } UDPContext;
48
49 #define UDP_TX_BUF_SIZE 32768
50
51 #ifdef CONFIG_IPV6
52
53 static int udp_ipv6_is_multicast_address(const struct sockaddr *addr) {
54 if (addr->sa_family == AF_INET)
55 return IN_MULTICAST(ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr));
56 if (addr->sa_family == AF_INET6)
57 return IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)addr)->sin6_addr);
58 return -1;
59 }
60
61 static int udp_ipv6_set_multicast_ttl(int sockfd, int mcastTTL, struct sockaddr *addr) {
62 if (addr->sa_family == AF_INET) {
63 if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
64 perror("setsockopt(IP_MULTICAST_TTL)");
65 return -1;
66 }
67 }
68 if (addr->sa_family == AF_INET6) {
69 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
70 perror("setsockopt(IPV6_MULTICAST_HOPS)");
71 return -1;
72 }
73 }
74 return 0;
75 }
76
77 static int udp_ipv6_join_multicast_group(int sockfd, struct sockaddr *addr) {
78 struct ip_mreq mreq;
79 struct ipv6_mreq mreq6;
80 if (addr->sa_family == AF_INET) {
81 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
82 mreq.imr_interface.s_addr= INADDR_ANY;
83 if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
84 perror("setsockopt(IP_ADD_MEMBERSHIP)");
85 return -1;
86 }
87 }
88 if (addr->sa_family == AF_INET6) {
89 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
90 mreq6.ipv6mr_interface= 0;
91 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
92 perror("setsockopt(IPV6_ADD_MEMBERSHIP)");
93 return -1;
94 }
95 }
96 return 0;
97 }
98
99 static int udp_ipv6_leave_multicast_group(int sockfd, struct sockaddr *addr) {
100 struct ip_mreq mreq;
101 struct ipv6_mreq mreq6;
102 if (addr->sa_family == AF_INET) {
103 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
104 mreq.imr_interface.s_addr= INADDR_ANY;
105 if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
106 perror("setsockopt(IP_DROP_MEMBERSHIP)");
107 return -1;
108 }
109 }
110 if (addr->sa_family == AF_INET6) {
111 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
112 mreq6.ipv6mr_interface= 0;
113 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
114 perror("setsockopt(IPV6_DROP_MEMBERSHIP)");
115 return -1;
116 }
117 }
118 return 0;
119 }
120
121 static struct addrinfo* udp_ipv6_resolve_host(const char *hostname, int port, int type, int family, int flags) {
122 struct addrinfo hints, *res = 0;
123 int error;
124 char sport[16];
125 const char *node = 0, *service = 0;
126
127 if (port > 0) {
128 snprintf(sport, sizeof(sport), "%d", port);
129 service = sport;
130 }
131 if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
132 node = hostname;
133 }
134 if ((node) || (service)) {
135 memset(&hints, 0, sizeof(hints));
136 hints.ai_socktype = type;
137 hints.ai_family = family;
138 hints.ai_flags = flags;
139 if ((error = getaddrinfo(node, service, &hints, &res))) {
140 av_log(NULL, AV_LOG_ERROR, "udp_ipv6_resolve_host: %s\n", gai_strerror(error));
141 }
142 }
143 return res;
144 }
145
146 static int udp_ipv6_set_remote_url(URLContext *h, const char *uri) {
147 UDPContext *s = h->priv_data;
148 char hostname[256];
149 int port;
150 struct addrinfo *res0;
151 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
152 res0 = udp_ipv6_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
153 if (res0 == 0) return AVERROR_IO;
154 memcpy(&s->dest_addr, res0->ai_addr, res0->ai_addrlen);
155 s->dest_addr_len = res0->ai_addrlen;
156 freeaddrinfo(res0);
157 return 0;
158 }
159
160 static int udp_ipv6_set_local(URLContext *h) {
161 UDPContext *s = h->priv_data;
162 int udp_fd = -1;
163 struct sockaddr_storage clientaddr;
164 socklen_t addrlen;
165 char sbuf[NI_MAXSERV];
166 char hbuf[NI_MAXHOST];
167 struct addrinfo *res0 = NULL, *res = NULL;
168
169 if (s->local_port != 0) {
170 res0 = udp_ipv6_resolve_host(0, s->local_port, SOCK_DGRAM, AF_UNSPEC, AI_PASSIVE);
171 if (res0 == 0)
172 goto fail;
173 for (res = res0; res; res=res->ai_next) {
174 udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
175 if (udp_fd > 0) break;
176 perror("socket");
177 }
178 } else {
179 udp_fd = socket(s->dest_addr.ss_family, SOCK_DGRAM, 0);
180 if (udp_fd < 0)
181 perror("socket");
182 }
183
184 if (udp_fd < 0)
185 goto fail;
186
187 if (s->local_port != 0) {
188 if (bind(udp_fd, res0->ai_addr, res0->ai_addrlen) < 0) {
189 perror("bind");
190 goto fail;
191 }
192 freeaddrinfo(res0);
193 res0 = NULL;
194 }
195
196 addrlen = sizeof(clientaddr);
197 if (getsockname(udp_fd, (struct sockaddr *)&clientaddr, &addrlen) < 0) {
198 perror("getsockname");
199 goto fail;
200 }
201
202 if (getnameinfo((struct sockaddr *)&clientaddr, addrlen, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
203 perror("getnameinfo");
204 goto fail;
205 }
206
207 s->local_port = strtol(sbuf, NULL, 10);
208
209 return udp_fd;
210
211 fail:
212 if (udp_fd >= 0)
213 closesocket(udp_fd);
214 if(res0)
215 freeaddrinfo(res0);
216 return -1;
217 }
218
219 #endif
220
221
222 /**
223 * If no filename is given to av_open_input_file because you want to
224 * get the local port first, then you must call this function to set
225 * the remote server address.
226 *
227 * url syntax: udp://host:port[?option=val...]
228 * option: 'multicast=1' : enable multicast
229 * 'ttl=n' : set the ttl value (for multicast only)
230 * 'localport=n' : set the local port
231 * 'pkt_size=n' : set max packet size
232 * 'reuse=1' : enable reusing the socket
233 *
234 * @param s1 media file context
235 * @param uri of the remote server
236 * @return zero if no error.
237 */
238 int udp_set_remote_url(URLContext *h, const char *uri)
239 {
240 #ifdef CONFIG_IPV6
241 return udp_ipv6_set_remote_url(h, uri);
242 #else
243 UDPContext *s = h->priv_data;
244 char hostname[256];
245 int port;
246
247 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
248
249 /* set the destination address */
250 if (resolve_host(&s->dest_addr.sin_addr, hostname) < 0)
251 return AVERROR_IO;
252 s->dest_addr.sin_family = AF_INET;
253 s->dest_addr.sin_port = htons(port);
254 return 0;
255 #endif
256 }
257
258 /**
259 * Return the local port used by the UDP connexion
260 * @param s1 media file context
261 * @return the local port number
262 */
263 int udp_get_local_port(URLContext *h)
264 {
265 UDPContext *s = h->priv_data;
266 return s->local_port;
267 }
268
269 /**
270 * Return the udp file handle for select() usage to wait for several RTP
271 * streams at the same time.
272 * @param h media file context
273 */
274 int udp_get_file_handle(URLContext *h)
275 {
276 UDPContext *s = h->priv_data;
277 return s->udp_fd;
278 }
279
280 /* put it in UDP context */
281 /* return non zero if error */
282 static int udp_open(URLContext *h, const char *uri, int flags)
283 {
284 char hostname[1024];
285 int port, udp_fd = -1, tmp;
286 UDPContext *s = NULL;
287 int is_output;
288 const char *p;
289 char buf[256];
290 #ifndef CONFIG_IPV6
291 struct sockaddr_in my_addr, my_addr1;
292 int len;
293 #endif
294
295 h->is_streamed = 1;
296 h->max_packet_size = 1472;
297
298 is_output = (flags & URL_WRONLY);
299
300 s = av_malloc(sizeof(UDPContext));
301 if (!s)
302 return -ENOMEM;
303
304 h->priv_data = s;
305 s->ttl = 16;
306 s->is_multicast = 0;
307 s->local_port = 0;
308 s->reuse_socket = 0;
309 p = strchr(uri, '?');
310 if (p) {
311 s->is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
312 s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
313 if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
314 s->ttl = strtol(buf, NULL, 10);
315 }
316 if (find_info_tag(buf, sizeof(buf), "localport", p)) {
317 s->local_port = strtol(buf, NULL, 10);
318 }
319 if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
320 h->max_packet_size = strtol(buf, NULL, 10);
321 }
322 }
323
324 /* fill the dest addr */
325 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
326
327 /* XXX: fix url_split */
328 if (hostname[0] == '\0' || hostname[0] == '?') {
329 /* only accepts null hostname if input */
330 if (s->is_multicast || (flags & URL_WRONLY))
331 goto fail;
332 } else {
333 udp_set_remote_url(h, uri);
334 }
335
336 #ifndef CONFIG_IPV6
337 udp_fd = socket(PF_INET, SOCK_DGRAM, 0);
338 if (udp_fd < 0)
339 goto fail;
340
341 my_addr.sin_family = AF_INET;
342 my_addr.sin_addr.s_addr = htonl (INADDR_ANY);
343 if (s->is_multicast && !(h->flags & URL_WRONLY)) {
344 /* special case: the bind must be done on the multicast address port */
345 my_addr.sin_port = s->dest_addr.sin_port;
346 } else {
347 my_addr.sin_port = htons(s->local_port);
348 }
349
350 if (s->reuse_socket)
351 if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
352 goto fail;
353
354 /* the bind is needed to give a port to the socket now */
355 if (bind(udp_fd,(struct sockaddr *)&my_addr, sizeof(my_addr)) < 0)
356 goto fail;
357
358 len = sizeof(my_addr1);
359 getsockname(udp_fd, (struct sockaddr *)&my_addr1, &len);
360 s->local_port = ntohs(my_addr1.sin_port);
361
362 #ifdef IP_MULTICAST_TTL
363 if (s->is_multicast) {
364 if (h->flags & URL_WRONLY) {
365 /* output */
366 if (setsockopt(udp_fd, IPPROTO_IP, IP_MULTICAST_TTL,
367 &s->ttl, sizeof(s->ttl)) < 0) {
368 perror("IP_MULTICAST_TTL");
369 goto fail;
370 }
371 } else {
372 /* input */
373 memset(&s->mreq, 0, sizeof(s->mreq));
374 s->mreq.imr_multiaddr = s->dest_addr.sin_addr;
375 s->mreq.imr_interface.s_addr = htonl (INADDR_ANY);
376 if (setsockopt(udp_fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
377 &s->mreq, sizeof(s->mreq)) < 0) {
378 perror("rtp: IP_ADD_MEMBERSHIP");
379 goto fail;
380 }
381 }
382 }
383 #endif
384 #else
385 if (s->is_multicast && !(h->flags & URL_WRONLY))
386 s->local_port = port;
387 udp_fd = udp_ipv6_set_local(h);
388 if (udp_fd < 0)
389 goto fail;
390 if (s->is_multicast) {
391 if (h->flags & URL_WRONLY) {
392 if (udp_ipv6_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
393 goto fail;
394 } else {
395 if (udp_ipv6_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
396 goto fail;
397 }
398 }
399 #endif
400
401 if (is_output) {
402 /* limit the tx buf size to limit latency */
403 tmp = UDP_TX_BUF_SIZE;
404 if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
405 perror("setsockopt sndbuf");
406 goto fail;
407 }
408 }
409
410 s->udp_fd = udp_fd;
411 return 0;
412 fail:
413 if (udp_fd >= 0)
414 closesocket(udp_fd);
415 av_free(s);
416 return AVERROR_IO;
417 }
418
419 static int udp_read(URLContext *h, uint8_t *buf, int size)
420 {
421 UDPContext *s = h->priv_data;
422 #ifndef CONFIG_IPV6
423 struct sockaddr_in from;
424 #else
425 struct sockaddr_storage from;
426 #endif
427 socklen_t from_len;
428 int len;
429
430 for(;;) {
431 from_len = sizeof(from);
432 len = recvfrom (s->udp_fd, buf, size, 0,
433 (struct sockaddr *)&from, &from_len);
434 if (len < 0) {
435 if (errno != EAGAIN && errno != EINTR)
436 return AVERROR_IO;
437 } else {
438 break;
439 }
440 }
441 return len;
442 }
443
444 static int udp_write(URLContext *h, uint8_t *buf, int size)
445 {
446 UDPContext *s = h->priv_data;
447 int ret;
448
449 for(;;) {
450 ret = sendto (s->udp_fd, buf, size, 0,
451 (struct sockaddr *) &s->dest_addr,
452 #ifndef CONFIG_IPV6
453 sizeof (s->dest_addr));
454 #else
455 s->dest_addr_len);
456 #endif
457 if (ret < 0) {
458 if (errno != EINTR && errno != EAGAIN)
459 return AVERROR_IO;
460 } else {
461 break;
462 }
463 }
464 return size;
465 }
466
467 static int udp_close(URLContext *h)
468 {
469 UDPContext *s = h->priv_data;
470
471 #ifndef CONFIG_IPV6
472 #ifdef IP_DROP_MEMBERSHIP
473 if (s->is_multicast && !(h->flags & URL_WRONLY)) {
474 if (setsockopt(s->udp_fd, IPPROTO_IP, IP_DROP_MEMBERSHIP,
475 &s->mreq, sizeof(s->mreq)) < 0) {
476 perror("IP_DROP_MEMBERSHIP");
477 }
478 }
479 #endif
480 #else
481 if (s->is_multicast && !(h->flags & URL_WRONLY))
482 udp_ipv6_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
483 #endif
484 closesocket(s->udp_fd);
485 av_free(s);
486 return 0;
487 }
488
489 URLProtocol udp_protocol = {
490 "udp",
491 udp_open,
492 udp_read,
493 udp_write,
494 NULL, /* seek */
495 udp_close,
496 };