Don't report EINTR from select as an error, retry select instead
[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
22 /**
23 * @file libavformat/udp.c
24 * UDP protocol
25 */
26
27 #define _BSD_SOURCE /* Needed for using struct ip_mreq with recent glibc */
28 #include "avformat.h"
29 #include <unistd.h>
30 #include "internal.h"
31 #include "network.h"
32 #include "os_support.h"
33 #if HAVE_SYS_SELECT_H
34 #include <sys/select.h>
35 #endif
36 #include <sys/time.h>
37
38 #ifndef IPV6_ADD_MEMBERSHIP
39 #define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
40 #define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
41 #endif
42 #ifndef IN_MULTICAST
43 #define IN_MULTICAST(a) ((((uint32_t)(a)) & 0xf0000000) == 0xe0000000)
44 #endif
45 #ifndef IN6_IS_ADDR_MULTICAST
46 #define IN6_IS_ADDR_MULTICAST(a) (((uint8_t *) (a))[0] == 0xff)
47 #endif
48
49 typedef struct {
50 int udp_fd;
51 int ttl;
52 int buffer_size;
53 int is_multicast;
54 int local_port;
55 int reuse_socket;
56 struct sockaddr_storage dest_addr;
57 int dest_addr_len;
58 } UDPContext;
59
60 #define UDP_TX_BUF_SIZE 32768
61 #define UDP_MAX_PKT_SIZE 65536
62
63 static int udp_set_multicast_ttl(int sockfd, int mcastTTL,
64 struct sockaddr *addr)
65 {
66 #ifdef IP_MULTICAST_TTL
67 if (addr->sa_family == AF_INET) {
68 if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
69 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL): %s\n", strerror(errno));
70 return -1;
71 }
72 }
73 #endif
74 #if defined(IPPROTO_IPV6) && defined(IPV6_MULTICAST_HOPS)
75 if (addr->sa_family == AF_INET6) {
76 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
77 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS): %s\n", strerror(errno));
78 return -1;
79 }
80 }
81 #endif
82 return 0;
83 }
84
85 static int udp_join_multicast_group(int sockfd, struct sockaddr *addr)
86 {
87 #ifdef IP_ADD_MEMBERSHIP
88 if (addr->sa_family == AF_INET) {
89 struct ip_mreq mreq;
90
91 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
92 mreq.imr_interface.s_addr= INADDR_ANY;
93 if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
94 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP): %s\n", strerror(errno));
95 return -1;
96 }
97 }
98 #endif
99 #if HAVE_STRUCT_IPV6_MREQ
100 if (addr->sa_family == AF_INET6) {
101 struct ipv6_mreq mreq6;
102
103 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
104 mreq6.ipv6mr_interface= 0;
105 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
106 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP): %s\n", strerror(errno));
107 return -1;
108 }
109 }
110 #endif
111 return 0;
112 }
113
114 static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr)
115 {
116 #ifdef IP_DROP_MEMBERSHIP
117 if (addr->sa_family == AF_INET) {
118 struct ip_mreq mreq;
119
120 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
121 mreq.imr_interface.s_addr= INADDR_ANY;
122 if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
123 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP): %s\n", strerror(errno));
124 return -1;
125 }
126 }
127 #endif
128 #if HAVE_STRUCT_IPV6_MREQ
129 if (addr->sa_family == AF_INET6) {
130 struct ipv6_mreq mreq6;
131
132 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
133 mreq6.ipv6mr_interface= 0;
134 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
135 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP): %s\n", strerror(errno));
136 return -1;
137 }
138 }
139 #endif
140 return 0;
141 }
142
143 static struct addrinfo* udp_resolve_host(const char *hostname, int port,
144 int type, int family, int flags)
145 {
146 struct addrinfo hints, *res = 0;
147 int error;
148 char sport[16];
149 const char *node = 0, *service = "0";
150
151 if (port > 0) {
152 snprintf(sport, sizeof(sport), "%d", port);
153 service = sport;
154 }
155 if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
156 node = hostname;
157 }
158 memset(&hints, 0, sizeof(hints));
159 hints.ai_socktype = type;
160 hints.ai_family = family;
161 hints.ai_flags = flags;
162 if ((error = getaddrinfo(node, service, &hints, &res))) {
163 res = NULL;
164 av_log(NULL, AV_LOG_ERROR, "udp_resolve_host: %s\n", gai_strerror(error));
165 }
166
167 return res;
168 }
169
170 static int udp_set_url(struct sockaddr_storage *addr,
171 const char *hostname, int port)
172 {
173 struct addrinfo *res0;
174 int addr_len;
175
176 res0 = udp_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
177 if (res0 == 0) return AVERROR(EIO);
178 memcpy(addr, res0->ai_addr, res0->ai_addrlen);
179 addr_len = res0->ai_addrlen;
180 freeaddrinfo(res0);
181
182 return addr_len;
183 }
184
185 static int is_multicast_address(struct sockaddr_storage *addr)
186 {
187 if (addr->ss_family == AF_INET) {
188 return IN_MULTICAST(ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr));
189 }
190 #if HAVE_STRUCT_SOCKADDR_IN6
191 if (addr->ss_family == AF_INET6) {
192 return IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)addr)->sin6_addr);
193 }
194 #endif
195
196 return 0;
197 }
198
199 static int udp_socket_create(UDPContext *s,
200 struct sockaddr_storage *addr, int *addr_len)
201 {
202 int udp_fd = -1;
203 struct addrinfo *res0 = NULL, *res = NULL;
204 int family = AF_UNSPEC;
205
206 if (((struct sockaddr *) &s->dest_addr)->sa_family)
207 family = ((struct sockaddr *) &s->dest_addr)->sa_family;
208 res0 = udp_resolve_host(0, s->local_port, SOCK_DGRAM, family, AI_PASSIVE);
209 if (res0 == 0)
210 goto fail;
211 for (res = res0; res; res=res->ai_next) {
212 udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
213 if (udp_fd > 0) break;
214 av_log(NULL, AV_LOG_ERROR, "socket: %s\n", strerror(errno));
215 }
216
217 if (udp_fd < 0)
218 goto fail;
219
220 memcpy(addr, res->ai_addr, res->ai_addrlen);
221 *addr_len = res->ai_addrlen;
222
223 freeaddrinfo(res0);
224
225 return udp_fd;
226
227 fail:
228 if (udp_fd >= 0)
229 closesocket(udp_fd);
230 if(res0)
231 freeaddrinfo(res0);
232 return -1;
233 }
234
235 static int udp_port(struct sockaddr_storage *addr, int addr_len)
236 {
237 char sbuf[sizeof(int)*3+1];
238
239 if (getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0, sbuf, sizeof(sbuf), NI_NUMERICSERV) != 0) {
240 av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", strerror(errno));
241 return -1;
242 }
243
244 return strtol(sbuf, NULL, 10);
245 }
246
247
248 /**
249 * If no filename is given to av_open_input_file because you want to
250 * get the local port first, then you must call this function to set
251 * the remote server address.
252 *
253 * url syntax: udp://host:port[?option=val...]
254 * option: 'ttl=n' : set the ttl value (for multicast only)
255 * 'localport=n' : set the local port
256 * 'pkt_size=n' : set max packet size
257 * 'reuse=1' : enable reusing the socket
258 *
259 * @param s1 media file context
260 * @param uri of the remote server
261 * @return zero if no error.
262 */
263 int udp_set_remote_url(URLContext *h, const char *uri)
264 {
265 UDPContext *s = h->priv_data;
266 char hostname[256];
267 int port;
268
269 ff_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
270
271 /* set the destination address */
272 s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port);
273 if (s->dest_addr_len < 0) {
274 return AVERROR(EIO);
275 }
276 s->is_multicast = is_multicast_address(&s->dest_addr);
277
278 return 0;
279 }
280
281 /**
282 * Return the local port used by the UDP connexion
283 * @param s1 media file context
284 * @return the local port number
285 */
286 int udp_get_local_port(URLContext *h)
287 {
288 UDPContext *s = h->priv_data;
289 return s->local_port;
290 }
291
292 /**
293 * Return the udp file handle for select() usage to wait for several RTP
294 * streams at the same time.
295 * @param h media file context
296 */
297 #if (LIBAVFORMAT_VERSION_MAJOR >= 53)
298 static
299 #endif
300 int udp_get_file_handle(URLContext *h)
301 {
302 UDPContext *s = h->priv_data;
303 return s->udp_fd;
304 }
305
306 /* put it in UDP context */
307 /* return non zero if error */
308 static int udp_open(URLContext *h, const char *uri, int flags)
309 {
310 char hostname[1024];
311 int port, udp_fd = -1, tmp, bind_ret = -1;
312 UDPContext *s = NULL;
313 int is_output;
314 const char *p;
315 char buf[256];
316 struct sockaddr_storage my_addr;
317 int len;
318
319 h->is_streamed = 1;
320 h->max_packet_size = 1472;
321
322 is_output = (flags & URL_WRONLY);
323
324 s = av_mallocz(sizeof(UDPContext));
325 if (!s)
326 return AVERROR(ENOMEM);
327
328 h->priv_data = s;
329 s->ttl = 16;
330 s->buffer_size = is_output ? UDP_TX_BUF_SIZE : UDP_MAX_PKT_SIZE;
331
332 p = strchr(uri, '?');
333 if (p) {
334 s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
335 if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
336 s->ttl = strtol(buf, NULL, 10);
337 }
338 if (find_info_tag(buf, sizeof(buf), "localport", p)) {
339 s->local_port = strtol(buf, NULL, 10);
340 }
341 if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
342 h->max_packet_size = strtol(buf, NULL, 10);
343 }
344 if (find_info_tag(buf, sizeof(buf), "buffer_size", p)) {
345 s->buffer_size = strtol(buf, NULL, 10);
346 }
347 }
348
349 /* fill the dest addr */
350 ff_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
351
352 /* XXX: fix ff_url_split */
353 if (hostname[0] == '\0' || hostname[0] == '?') {
354 /* only accepts null hostname if input */
355 if (flags & URL_WRONLY)
356 goto fail;
357 } else {
358 udp_set_remote_url(h, uri);
359 }
360
361 if (s->is_multicast && !(h->flags & URL_WRONLY))
362 s->local_port = port;
363 udp_fd = udp_socket_create(s, &my_addr, &len);
364 if (udp_fd < 0)
365 goto fail;
366
367 if (s->reuse_socket)
368 if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
369 goto fail;
370
371 /* the bind is needed to give a port to the socket now */
372 /* if multicast, try the multicast address bind first */
373 if (s->is_multicast && !(h->flags & URL_WRONLY)) {
374 bind_ret = bind(udp_fd,(struct sockaddr *)&s->dest_addr, len);
375 }
376 /* bind to the local address if not multicast or if the multicast
377 * bind failed */
378 if (bind_ret < 0 && bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0)
379 goto fail;
380
381 len = sizeof(my_addr);
382 getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
383 s->local_port = udp_port(&my_addr, len);
384
385 if (s->is_multicast) {
386 if (h->flags & URL_WRONLY) {
387 /* output */
388 if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
389 goto fail;
390 } else {
391 /* input */
392 if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
393 goto fail;
394 }
395 }
396
397 if (is_output) {
398 /* limit the tx buf size to limit latency */
399 tmp = s->buffer_size;
400 if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
401 av_log(NULL, AV_LOG_ERROR, "setsockopt(SO_SNDBUF): %s\n", strerror(errno));
402 goto fail;
403 }
404 } else {
405 /* set udp recv buffer size to the largest possible udp packet size to
406 * avoid losing data on OSes that set this too low by default. */
407 tmp = s->buffer_size;
408 if (setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp)) < 0) {
409 av_log(NULL, AV_LOG_WARNING, "setsockopt(SO_RECVBUF): %s\n", strerror(errno));
410 }
411 /* make the socket non-blocking */
412 ff_socket_nonblock(udp_fd, 1);
413 }
414
415 s->udp_fd = udp_fd;
416 return 0;
417 fail:
418 if (udp_fd >= 0)
419 closesocket(udp_fd);
420 av_free(s);
421 return AVERROR(EIO);
422 }
423
424 static int udp_read(URLContext *h, uint8_t *buf, int size)
425 {
426 UDPContext *s = h->priv_data;
427 int len;
428 fd_set rfds;
429 int ret;
430 struct timeval tv;
431
432 for(;;) {
433 if (url_interrupt_cb())
434 return AVERROR(EINTR);
435 FD_ZERO(&rfds);
436 FD_SET(s->udp_fd, &rfds);
437 tv.tv_sec = 0;
438 tv.tv_usec = 100 * 1000;
439 ret = select(s->udp_fd + 1, &rfds, NULL, NULL, &tv);
440 if (ret < 0) {
441 if (ff_neterrno() == FF_NETERROR(EINTR))
442 continue;
443 return AVERROR(EIO);
444 }
445 if (!(ret > 0 && FD_ISSET(s->udp_fd, &rfds)))
446 continue;
447 len = recv(s->udp_fd, buf, size, 0);
448 if (len < 0) {
449 if (ff_neterrno() != FF_NETERROR(EAGAIN) &&
450 ff_neterrno() != FF_NETERROR(EINTR))
451 return AVERROR(EIO);
452 } else {
453 break;
454 }
455 }
456 return len;
457 }
458
459 static int udp_write(URLContext *h, uint8_t *buf, int size)
460 {
461 UDPContext *s = h->priv_data;
462 int ret;
463
464 for(;;) {
465 ret = sendto (s->udp_fd, buf, size, 0,
466 (struct sockaddr *) &s->dest_addr,
467 s->dest_addr_len);
468 if (ret < 0) {
469 if (ff_neterrno() != FF_NETERROR(EINTR) &&
470 ff_neterrno() != FF_NETERROR(EAGAIN))
471 return AVERROR(EIO);
472 } else {
473 break;
474 }
475 }
476 return size;
477 }
478
479 static int udp_close(URLContext *h)
480 {
481 UDPContext *s = h->priv_data;
482
483 if (s->is_multicast && !(h->flags & URL_WRONLY))
484 udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
485 closesocket(s->udp_fd);
486 av_free(s);
487 return 0;
488 }
489
490 URLProtocol udp_protocol = {
491 "udp",
492 udp_open,
493 udp_read,
494 udp_write,
495 NULL, /* seek */
496 udp_close,
497 .url_get_file_handle = udp_get_file_handle,
498 };