Don't report EINTR from select as an error, retry select instead
[libav.git] / libavformat / udp.c
CommitLineData
de6d9b64
FB
1/*
2 * UDP prototype streaming system
406792e7 3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
de6d9b64 4 *
b78e7197
DB
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
19720f15
FB
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
b78e7197 10 * version 2.1 of the License, or (at your option) any later version.
de6d9b64 11 *
b78e7197 12 * FFmpeg is distributed in the hope that it will be useful,
de6d9b64 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19720f15
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
de6d9b64 16 *
19720f15 17 * You should have received a copy of the GNU Lesser General Public
b78e7197 18 * License along with FFmpeg; if not, write to the Free Software
5509bffa 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
de6d9b64 20 */
3adfb377
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21
22/**
bad5537e 23 * @file libavformat/udp.c
3adfb377
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24 * UDP protocol
25 */
26
a9e02947 27#define _BSD_SOURCE /* Needed for using struct ip_mreq with recent glibc */
8be1c656 28#include "avformat.h"
de6d9b64 29#include <unistd.h>
e4a9e3cc 30#include "internal.h"
42572ef5 31#include "network.h"
087b3272 32#include "os_support.h"
b250f9c6 33#if HAVE_SYS_SELECT_H
7d084299
JM
34#include <sys/select.h>
35#endif
c0a8f8d4 36#include <sys/time.h>
de6d9b64 37
9c633e9a
AB
38#ifndef IPV6_ADD_MEMBERSHIP
39#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
40#define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
41#endif
35b74c3d
LA
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
9c633e9a 48
de6d9b64 49typedef struct {
2d225591
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50 int udp_fd;
51 int ttl;
236bb1ab 52 int buffer_size;
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53 int is_multicast;
54 int local_port;
34ecc397 55 int reuse_socket;
7a91333f 56 struct sockaddr_storage dest_addr;
397db8ac 57 int dest_addr_len;
de6d9b64
FB
58} UDPContext;
59
60#define UDP_TX_BUF_SIZE 32768
f18cae4d 61#define UDP_MAX_PKT_SIZE 65536
de6d9b64 62
64810754
RB
63static int udp_set_multicast_ttl(int sockfd, int mcastTTL,
64 struct sockaddr *addr)
65{
a8bde059 66#ifdef IP_MULTICAST_TTL
7a91333f
HZ
67 if (addr->sa_family == AF_INET) {
68 if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
086119b3 69 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL): %s\n", strerror(errno));
7a91333f
HZ
70 return -1;
71 }
72 }
a8bde059 73#endif
b4d68544 74#if defined(IPPROTO_IPV6) && defined(IPV6_MULTICAST_HOPS)
7a91333f
HZ
75 if (addr->sa_family == AF_INET6) {
76 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
086119b3 77 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS): %s\n", strerror(errno));
7a91333f
HZ
78 return -1;
79 }
80 }
a8bde059 81#endif
7a91333f
HZ
82 return 0;
83}
84
64810754
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85static int udp_join_multicast_group(int sockfd, struct sockaddr *addr)
86{
a8bde059 87#ifdef IP_ADD_MEMBERSHIP
7a91333f 88 if (addr->sa_family == AF_INET) {
a8bde059
LA
89 struct ip_mreq mreq;
90
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HZ
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) {
086119b3 94 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP): %s\n", strerror(errno));
7a91333f
HZ
95 return -1;
96 }
97 }
a8bde059 98#endif
b4d68544 99#if HAVE_STRUCT_IPV6_MREQ
7a91333f 100 if (addr->sa_family == AF_INET6) {
a8bde059
LA
101 struct ipv6_mreq mreq6;
102
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HZ
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) {
086119b3 106 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP): %s\n", strerror(errno));
7a91333f
HZ
107 return -1;
108 }
109 }
a8bde059 110#endif
7a91333f
HZ
111 return 0;
112}
113
64810754
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114static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr)
115{
a8bde059 116#ifdef IP_DROP_MEMBERSHIP
7a91333f 117 if (addr->sa_family == AF_INET) {
a8bde059
LA
118 struct ip_mreq mreq;
119
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HZ
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) {
086119b3 123 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP): %s\n", strerror(errno));
7a91333f
HZ
124 return -1;
125 }
126 }
a8bde059 127#endif
b4d68544 128#if HAVE_STRUCT_IPV6_MREQ
7a91333f 129 if (addr->sa_family == AF_INET6) {
a8bde059
LA
130 struct ipv6_mreq mreq6;
131
7a91333f
HZ
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) {
086119b3 135 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP): %s\n", strerror(errno));
7a91333f
HZ
136 return -1;
137 }
138 }
a8bde059 139#endif
7a91333f
HZ
140 return 0;
141}
142
64810754
RB
143static struct addrinfo* udp_resolve_host(const char *hostname, int port,
144 int type, int family, int flags)
145{
7a91333f
HZ
146 struct addrinfo hints, *res = 0;
147 int error;
148 char sport[16];
d607861c 149 const char *node = 0, *service = "0";
7a91333f
HZ
150
151 if (port > 0) {
2fc8ea24 152 snprintf(sport, sizeof(sport), "%d", port);
7a91333f
HZ
153 service = sport;
154 }
155 if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
156 node = hostname;
157 }
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LA
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))) {
11a74f36 163 res = NULL;
7c823d8b 164 av_log(NULL, AV_LOG_ERROR, "udp_resolve_host: %s\n", gai_strerror(error));
7d8576c2
LA
165 }
166
7a91333f
HZ
167 return res;
168}
169
64810754
RB
170static int udp_set_url(struct sockaddr_storage *addr,
171 const char *hostname, int port)
172{
7a91333f 173 struct addrinfo *res0;
d05cb726
LA
174 int addr_len;
175
7c823d8b 176 res0 = udp_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
6f3e0b21 177 if (res0 == 0) return AVERROR(EIO);
d05cb726
LA
178 memcpy(addr, res0->ai_addr, res0->ai_addrlen);
179 addr_len = res0->ai_addrlen;
7a91333f 180 freeaddrinfo(res0);
d05cb726
LA
181
182 return addr_len;
7a91333f
HZ
183}
184
35b74c3d
LA
185static 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 }
b4d68544 190#if HAVE_STRUCT_SOCKADDR_IN6
35b74c3d
LA
191 if (addr->ss_family == AF_INET6) {
192 return IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)addr)->sin6_addr);
193 }
b4d68544 194#endif
35b74c3d
LA
195
196 return 0;
197}
198
64810754
RB
199static int udp_socket_create(UDPContext *s,
200 struct sockaddr_storage *addr, int *addr_len)
aa519c47 201{
7a91333f 202 int udp_fd = -1;
276358c1 203 struct addrinfo *res0 = NULL, *res = NULL;
51844e6c 204 int family = AF_UNSPEC;
115329f1 205
51844e6c
RB
206 if (((struct sockaddr *) &s->dest_addr)->sa_family)
207 family = ((struct sockaddr *) &s->dest_addr)->sa_family;
7c823d8b 208 res0 = udp_resolve_host(0, s->local_port, SOCK_DGRAM, family, AI_PASSIVE);
7d8576c2
LA
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;
086119b3 214 av_log(NULL, AV_LOG_ERROR, "socket: %s\n", strerror(errno));
7d8576c2 215 }
276358c1
HZ
216
217 if (udp_fd < 0)
7a91333f 218 goto fail;
115329f1 219
aa519c47
LA
220 memcpy(addr, res->ai_addr, res->ai_addrlen);
221 *addr_len = res->ai_addrlen;
7a91333f 222
aa519c47 223 freeaddrinfo(res0);
115329f1 224
7a91333f 225 return udp_fd;
115329f1 226
7a91333f
HZ
227 fail:
228 if (udp_fd >= 0)
7a91333f 229 closesocket(udp_fd);
88730be6
MR
230 if(res0)
231 freeaddrinfo(res0);
7a91333f
HZ
232 return -1;
233}
234
aa519c47
LA
235static int udp_port(struct sockaddr_storage *addr, int addr_len)
236{
03c09e43 237 char sbuf[sizeof(int)*3+1];
aa519c47 238
03c09e43 239 if (getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0, sbuf, sizeof(sbuf), NI_NUMERICSERV) != 0) {
086119b3 240 av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", strerror(errno));
aa519c47
LA
241 return -1;
242 }
243
244 return strtol(sbuf, NULL, 10);
245}
246
7a91333f 247
2d225591
FB
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...]
35b74c3d 254 * option: 'ttl=n' : set the ttl value (for multicast only)
2d225591 255 * 'localport=n' : set the local port
9899efb4 256 * 'pkt_size=n' : set max packet size
34ecc397 257 * 'reuse=1' : enable reusing the socket
2d225591
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258 *
259 * @param s1 media file context
260 * @param uri of the remote server
261 * @return zero if no error.
262 */
263int udp_set_remote_url(URLContext *h, const char *uri)
264{
265 UDPContext *s = h->priv_data;
266 char hostname[256];
267 int port;
115329f1 268
c5c6e67c 269 ff_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
de6d9b64 270
2d225591 271 /* set the destination address */
d05cb726
LA
272 s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port);
273 if (s->dest_addr_len < 0) {
6f3e0b21 274 return AVERROR(EIO);
d05cb726 275 }
35b74c3d 276 s->is_multicast = is_multicast_address(&s->dest_addr);
d05cb726 277
2d225591
FB
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 */
286int 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 */
f0a80394
RB
297#if (LIBAVFORMAT_VERSION_MAJOR >= 53)
298static
299#endif
2d225591
FB
300int 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 */
de6d9b64
FB
307/* return non zero if error */
308static int udp_open(URLContext *h, const char *uri, int flags)
309{
de6d9b64 310 char hostname[1024];
36b53281 311 int port, udp_fd = -1, tmp, bind_ret = -1;
2d225591 312 UDPContext *s = NULL;
88730be6 313 int is_output;
2d225591
FB
314 const char *p;
315 char buf[256];
aa519c47 316 struct sockaddr_storage my_addr;
aa519c47 317 int len;
de6d9b64
FB
318
319 h->is_streamed = 1;
9899efb4 320 h->max_packet_size = 1472;
de6d9b64 321
2d225591 322 is_output = (flags & URL_WRONLY);
115329f1 323
51844e6c 324 s = av_mallocz(sizeof(UDPContext));
2d225591 325 if (!s)
8fa36ae0 326 return AVERROR(ENOMEM);
2d225591
FB
327
328 h->priv_data = s;
329 s->ttl = 16;
236bb1ab
JM
330 s->buffer_size = is_output ? UDP_TX_BUF_SIZE : UDP_MAX_PKT_SIZE;
331
2d225591
FB
332 p = strchr(uri, '?');
333 if (p) {
34ecc397 334 s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
2d225591
FB
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 }
9899efb4
MK
341 if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
342 h->max_packet_size = strtol(buf, NULL, 10);
343 }
236bb1ab
JM
344 if (find_info_tag(buf, sizeof(buf), "buffer_size", p)) {
345 s->buffer_size = strtol(buf, NULL, 10);
346 }
de6d9b64 347 }
2d225591
FB
348
349 /* fill the dest addr */
c5c6e67c 350 ff_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
115329f1 351
c5c6e67c 352 /* XXX: fix ff_url_split */
2d225591
FB
353 if (hostname[0] == '\0' || hostname[0] == '?') {
354 /* only accepts null hostname if input */
35b74c3d 355 if (flags & URL_WRONLY)
2d225591
FB
356 goto fail;
357 } else {
358 udp_set_remote_url(h, uri);
359 }
de6d9b64 360
882d00f2
LA
361 if (s->is_multicast && !(h->flags & URL_WRONLY))
362 s->local_port = port;
aa519c47 363 udp_fd = udp_socket_create(s, &my_addr, &len);
2d225591
FB
364 if (udp_fd < 0)
365 goto fail;
366
34ecc397
T
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
de6d9b64 371 /* the bind is needed to give a port to the socket now */
36b53281
JM
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)
de6d9b64
FB
379 goto fail;
380
d4936869
LA
381 len = sizeof(my_addr);
382 getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
aa519c47
LA
383 s->local_port = udp_port(&my_addr, len);
384
7a91333f
HZ
385 if (s->is_multicast) {
386 if (h->flags & URL_WRONLY) {
a8bde059 387 /* output */
9cdcb04f 388 if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
7a91333f
HZ
389 goto fail;
390 } else {
a8bde059 391 /* input */
9cdcb04f 392 if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
7a91333f
HZ
393 goto fail;
394 }
395 }
de6d9b64 396
2d225591
FB
397 if (is_output) {
398 /* limit the tx buf size to limit latency */
236bb1ab 399 tmp = s->buffer_size;
2d225591 400 if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
086119b3 401 av_log(NULL, AV_LOG_ERROR, "setsockopt(SO_SNDBUF): %s\n", strerror(errno));
2d225591
FB
402 goto fail;
403 }
f18cae4d
RP
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. */
236bb1ab
JM
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 }
ce09d560
JM
411 /* make the socket non-blocking */
412 ff_socket_nonblock(udp_fd, 1);
2d225591
FB
413 }
414
415 s->udp_fd = udp_fd;
de6d9b64
FB
416 return 0;
417 fail:
2d225591 418 if (udp_fd >= 0)
9ddd71fc 419 closesocket(udp_fd);
2d225591 420 av_free(s);
6f3e0b21 421 return AVERROR(EIO);
de6d9b64
FB
422}
423
0c1a9eda 424static int udp_read(URLContext *h, uint8_t *buf, int size)
de6d9b64
FB
425{
426 UDPContext *s = h->priv_data;
191e8ca7 427 int len;
7d084299
JM
428 fd_set rfds;
429 int ret;
430 struct timeval tv;
2d225591
FB
431
432 for(;;) {
7d084299
JM
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);
cae9a15c
MS
440 if (ret < 0) {
441 if (ff_neterrno() == FF_NETERROR(EINTR))
442 continue;
7d084299 443 return AVERROR(EIO);
cae9a15c 444 }
7d084299
JM
445 if (!(ret > 0 && FD_ISSET(s->udp_fd, &rfds)))
446 continue;
ce09d560 447 len = recv(s->udp_fd, buf, size, 0);
2d225591 448 if (len < 0) {
8da4034f
AB
449 if (ff_neterrno() != FF_NETERROR(EAGAIN) &&
450 ff_neterrno() != FF_NETERROR(EINTR))
6f3e0b21 451 return AVERROR(EIO);
2d225591
FB
452 } else {
453 break;
454 }
455 }
456 return len;
de6d9b64
FB
457}
458
0c1a9eda 459static int udp_write(URLContext *h, uint8_t *buf, int size)
de6d9b64
FB
460{
461 UDPContext *s = h->priv_data;
2d225591
FB
462 int ret;
463
464 for(;;) {
115329f1 465 ret = sendto (s->udp_fd, buf, size, 0,
2d225591 466 (struct sockaddr *) &s->dest_addr,
7a91333f 467 s->dest_addr_len);
2d225591 468 if (ret < 0) {
8da4034f
AB
469 if (ff_neterrno() != FF_NETERROR(EINTR) &&
470 ff_neterrno() != FF_NETERROR(EAGAIN))
6f3e0b21 471 return AVERROR(EIO);
2d225591
FB
472 } else {
473 break;
474 }
de6d9b64 475 }
2d225591
FB
476 return size;
477}
478
479static int udp_close(URLContext *h)
480{
481 UDPContext *s = h->priv_data;
482
7a91333f 483 if (s->is_multicast && !(h->flags & URL_WRONLY))
9cdcb04f 484 udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
9ddd71fc 485 closesocket(s->udp_fd);
2d225591
FB
486 av_free(s);
487 return 0;
de6d9b64
FB
488}
489
490URLProtocol udp_protocol = {
491 "udp",
492 udp_open,
2d225591 493 udp_read,
de6d9b64
FB
494 udp_write,
495 NULL, /* seek */
496 udp_close,
f0a80394 497 .url_get_file_handle = udp_get_file_handle,
de6d9b64 498};