b33224aff62c748d75a7f6c7850e522bfdebc5be
[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
157 res0 = udp_ipv6_resolve_host(0, s->local_port, SOCK_DGRAM, AF_UNSPEC, AI_PASSIVE);
158 if (res0 == 0)
159 goto fail;
160 for (res = res0; res; res=res->ai_next) {
161 udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
162 if (udp_fd > 0) break;
163 perror("socket");
164 }
165
166 if (udp_fd < 0)
167 goto fail;
168
169 if (bind(udp_fd, res0->ai_addr, res0->ai_addrlen) < 0) {
170 perror("bind");
171 goto fail;
172 }
173 freeaddrinfo(res0);
174 res0 = NULL;
175
176 addrlen = sizeof(clientaddr);
177 if (getsockname(udp_fd, (struct sockaddr *)&clientaddr, &addrlen) < 0) {
178 perror("getsockname");
179 goto fail;
180 }
181
182 if (getnameinfo((struct sockaddr *)&clientaddr, addrlen, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
183 perror("getnameinfo");
184 goto fail;
185 }
186
187 s->local_port = strtol(sbuf, NULL, 10);
188
189 return udp_fd;
190
191 fail:
192 if (udp_fd >= 0)
193 closesocket(udp_fd);
194 if(res0)
195 freeaddrinfo(res0);
196 return -1;
197 }
198
199 #endif /* CONFIG_IPV6 */
200
201
202 /**
203 * If no filename is given to av_open_input_file because you want to
204 * get the local port first, then you must call this function to set
205 * the remote server address.
206 *
207 * url syntax: udp://host:port[?option=val...]
208 * option: 'multicast=1' : enable multicast
209 * 'ttl=n' : set the ttl value (for multicast only)
210 * 'localport=n' : set the local port
211 * 'pkt_size=n' : set max packet size
212 * 'reuse=1' : enable reusing the socket
213 *
214 * @param s1 media file context
215 * @param uri of the remote server
216 * @return zero if no error.
217 */
218 int udp_set_remote_url(URLContext *h, const char *uri)
219 {
220 #ifdef CONFIG_IPV6
221 return udp_ipv6_set_remote_url(h, uri);
222 #else
223 UDPContext *s = h->priv_data;
224 char hostname[256];
225 int port;
226
227 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
228
229 /* set the destination address */
230 if (resolve_host(&s->dest_addr.sin_addr, hostname) < 0)
231 return AVERROR(EIO);
232 s->dest_addr.sin_family = AF_INET;
233 s->dest_addr.sin_port = htons(port);
234 return 0;
235 #endif
236 }
237
238 /**
239 * Return the local port used by the UDP connexion
240 * @param s1 media file context
241 * @return the local port number
242 */
243 int udp_get_local_port(URLContext *h)
244 {
245 UDPContext *s = h->priv_data;
246 return s->local_port;
247 }
248
249 /**
250 * Return the udp file handle for select() usage to wait for several RTP
251 * streams at the same time.
252 * @param h media file context
253 */
254 int udp_get_file_handle(URLContext *h)
255 {
256 UDPContext *s = h->priv_data;
257 return s->udp_fd;
258 }
259
260 /* put it in UDP context */
261 /* return non zero if error */
262 static int udp_open(URLContext *h, const char *uri, int flags)
263 {
264 char hostname[1024];
265 int port, udp_fd = -1, tmp;
266 UDPContext *s = NULL;
267 int is_output;
268 const char *p;
269 char buf[256];
270 #ifndef CONFIG_IPV6
271 struct sockaddr_in my_addr, my_addr1;
272 int len;
273 #endif
274
275 h->is_streamed = 1;
276 h->max_packet_size = 1472;
277
278 is_output = (flags & URL_WRONLY);
279
280 s = av_malloc(sizeof(UDPContext));
281 if (!s)
282 return AVERROR(ENOMEM);
283
284 h->priv_data = s;
285 s->ttl = 16;
286 s->is_multicast = 0;
287 s->local_port = 0;
288 s->reuse_socket = 0;
289 p = strchr(uri, '?');
290 if (p) {
291 s->is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
292 s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
293 if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
294 s->ttl = strtol(buf, NULL, 10);
295 }
296 if (find_info_tag(buf, sizeof(buf), "localport", p)) {
297 s->local_port = strtol(buf, NULL, 10);
298 }
299 if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
300 h->max_packet_size = strtol(buf, NULL, 10);
301 }
302 }
303
304 /* fill the dest addr */
305 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
306
307 /* XXX: fix url_split */
308 if (hostname[0] == '\0' || hostname[0] == '?') {
309 /* only accepts null hostname if input */
310 if (s->is_multicast || (flags & URL_WRONLY))
311 goto fail;
312 } else {
313 udp_set_remote_url(h, uri);
314 }
315
316 if(!ff_network_init())
317 return AVERROR(EIO);
318
319 #ifndef CONFIG_IPV6
320 udp_fd = socket(AF_INET, SOCK_DGRAM, 0);
321 if (udp_fd < 0)
322 goto fail;
323
324 my_addr.sin_family = AF_INET;
325 my_addr.sin_addr.s_addr = htonl (INADDR_ANY);
326 if (s->is_multicast && !(h->flags & URL_WRONLY)) {
327 /* special case: the bind must be done on the multicast address port */
328 my_addr.sin_port = s->dest_addr.sin_port;
329 } else {
330 my_addr.sin_port = htons(s->local_port);
331 }
332
333 if (s->reuse_socket)
334 if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
335 goto fail;
336
337 /* the bind is needed to give a port to the socket now */
338 if (bind(udp_fd,(struct sockaddr *)&my_addr, sizeof(my_addr)) < 0)
339 goto fail;
340
341 len = sizeof(my_addr1);
342 getsockname(udp_fd, (struct sockaddr *)&my_addr1, &len);
343 s->local_port = ntohs(my_addr1.sin_port);
344
345 #ifdef IP_MULTICAST_TTL
346 if (s->is_multicast) {
347 if (h->flags & URL_WRONLY) {
348 /* output */
349 if (setsockopt(udp_fd, IPPROTO_IP, IP_MULTICAST_TTL,
350 &s->ttl, sizeof(s->ttl)) < 0) {
351 perror("IP_MULTICAST_TTL");
352 goto fail;
353 }
354 } else {
355 /* input */
356 memset(&s->mreq, 0, sizeof(s->mreq));
357 s->mreq.imr_multiaddr = s->dest_addr.sin_addr;
358 s->mreq.imr_interface.s_addr = htonl (INADDR_ANY);
359 if (setsockopt(udp_fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
360 &s->mreq, sizeof(s->mreq)) < 0) {
361 perror("rtp: IP_ADD_MEMBERSHIP");
362 goto fail;
363 }
364 }
365 }
366 #endif
367 #else
368 if (s->is_multicast && !(h->flags & URL_WRONLY))
369 s->local_port = port;
370 udp_fd = udp_ipv6_set_local(h);
371 if (udp_fd < 0)
372 goto fail;
373 if (s->is_multicast) {
374 if (h->flags & URL_WRONLY) {
375 if (udp_ipv6_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
376 goto fail;
377 } else {
378 if (udp_ipv6_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
379 goto fail;
380 }
381 }
382 #endif /* CONFIG_IPV6 */
383
384 if (is_output) {
385 /* limit the tx buf size to limit latency */
386 tmp = UDP_TX_BUF_SIZE;
387 if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
388 perror("setsockopt sndbuf");
389 goto fail;
390 }
391 } else {
392 /* set udp recv buffer size to the largest possible udp packet size to
393 * avoid losing data on OSes that set this too low by default. */
394 tmp = UDP_MAX_PKT_SIZE;
395 setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp));
396 }
397
398 s->udp_fd = udp_fd;
399 return 0;
400 fail:
401 if (udp_fd >= 0)
402 closesocket(udp_fd);
403 av_free(s);
404 return AVERROR(EIO);
405 }
406
407 static int udp_read(URLContext *h, uint8_t *buf, int size)
408 {
409 UDPContext *s = h->priv_data;
410 #ifndef CONFIG_IPV6
411 struct sockaddr_in from;
412 #else
413 struct sockaddr_storage from;
414 #endif
415 socklen_t from_len;
416 int len;
417
418 for(;;) {
419 from_len = sizeof(from);
420 len = recvfrom (s->udp_fd, buf, size, 0,
421 (struct sockaddr *)&from, &from_len);
422 if (len < 0) {
423 if (ff_neterrno() != FF_NETERROR(EAGAIN) &&
424 ff_neterrno() != FF_NETERROR(EINTR))
425 return AVERROR(EIO);
426 } else {
427 break;
428 }
429 }
430 return len;
431 }
432
433 static int udp_write(URLContext *h, uint8_t *buf, int size)
434 {
435 UDPContext *s = h->priv_data;
436 int ret;
437
438 for(;;) {
439 ret = sendto (s->udp_fd, buf, size, 0,
440 (struct sockaddr *) &s->dest_addr,
441 #ifndef CONFIG_IPV6
442 sizeof (s->dest_addr));
443 #else
444 s->dest_addr_len);
445 #endif
446 if (ret < 0) {
447 if (ff_neterrno() != FF_NETERROR(EINTR) &&
448 ff_neterrno() != FF_NETERROR(EAGAIN))
449 return AVERROR(EIO);
450 } else {
451 break;
452 }
453 }
454 return size;
455 }
456
457 static int udp_close(URLContext *h)
458 {
459 UDPContext *s = h->priv_data;
460
461 #ifndef CONFIG_IPV6
462 #ifdef IP_DROP_MEMBERSHIP
463 if (s->is_multicast && !(h->flags & URL_WRONLY)) {
464 if (setsockopt(s->udp_fd, IPPROTO_IP, IP_DROP_MEMBERSHIP,
465 &s->mreq, sizeof(s->mreq)) < 0) {
466 perror("IP_DROP_MEMBERSHIP");
467 }
468 }
469 #endif
470 #else
471 if (s->is_multicast && !(h->flags & URL_WRONLY))
472 udp_ipv6_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
473 #endif
474 closesocket(s->udp_fd);
475 ff_network_close();
476 av_free(s);
477 return 0;
478 }
479
480 URLProtocol udp_protocol = {
481 "udp",
482 udp_open,
483 udp_read,
484 udp_write,
485 NULL, /* seek */
486 udp_close,
487 };