9d4c130e5bd7060959339aa6a07a760487223e10
[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 Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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
24 * UDP protocol
25 */
26
27 #define _BSD_SOURCE /* Needed for using struct ip_mreq with recent glibc */
28
29 #include "avformat.h"
30 #include "avio_internal.h"
31 #include "libavutil/parseutils.h"
32 #include "libavutil/avstring.h"
33 #include "libavutil/opt.h"
34 #include "internal.h"
35 #include "network.h"
36 #include "os_support.h"
37 #include "url.h"
38
39 #ifndef IPV6_ADD_MEMBERSHIP
40 #define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
41 #define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
42 #endif
43
44 typedef struct UDPContext {
45 const AVClass *class;
46 int udp_fd;
47 int ttl;
48 int buffer_size;
49 int pkt_size;
50 int is_multicast;
51 int local_port;
52 int reuse_socket;
53 struct sockaddr_storage dest_addr;
54 int dest_addr_len;
55 int is_connected;
56 char *localaddr;
57 char *sources;
58 char *block;
59 } UDPContext;
60
61 #define UDP_TX_BUF_SIZE 32768
62 #define UDP_MAX_PKT_SIZE 65536
63
64 #define OFFSET(x) offsetof(UDPContext, x)
65 #define D AV_OPT_FLAG_DECODING_PARAM
66 #define E AV_OPT_FLAG_ENCODING_PARAM
67 static const AVOption options[] = {
68 { "ttl", "Time to live (in milliseconds, multicast only)", OFFSET(ttl), AV_OPT_TYPE_INT, { .i64 = 16 }, 0, INT_MAX, .flags = D|E },
69 { "buffer_size", "System data size (in bytes)", OFFSET(buffer_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
70 { "local_port", "Local port", OFFSET(local_port), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
71 { "reuse_socket", "Reuse socket", OFFSET(reuse_socket), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 1, .flags = D|E },
72 { "connect", "Connect socket", OFFSET(is_connected), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, .flags = D|E },
73 { "pkt_size", "Maximum packet size", OFFSET(pkt_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
74 { "localaddr", "Local address", OFFSET(localaddr), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = D|E },
75 { "sources", "Source list", OFFSET(sources), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = D|E },
76 { "block", "Block list", OFFSET(block), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = D|E },
77 { NULL }
78 };
79
80 static const AVClass udp_class = {
81 .class_name = "udp",
82 .item_name = av_default_item_name,
83 .option = options,
84 .version = LIBAVUTIL_VERSION_INT,
85 };
86
87 static void log_net_error(void *ctx, int level, const char* prefix)
88 {
89 char errbuf[100];
90 av_strerror(ff_neterrno(), errbuf, sizeof(errbuf));
91 av_log(ctx, level, "%s: %s\n", prefix, errbuf);
92 }
93
94 static int udp_set_multicast_ttl(int sockfd, int mcastTTL,
95 struct sockaddr *addr)
96 {
97 #ifdef IP_MULTICAST_TTL
98 if (addr->sa_family == AF_INET) {
99 if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
100 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL)");
101 return -1;
102 }
103 }
104 #endif
105 #if defined(IPPROTO_IPV6) && defined(IPV6_MULTICAST_HOPS)
106 if (addr->sa_family == AF_INET6) {
107 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
108 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS)");
109 return -1;
110 }
111 }
112 #endif
113 return 0;
114 }
115
116 static int udp_join_multicast_group(int sockfd, struct sockaddr *addr)
117 {
118 #ifdef IP_ADD_MEMBERSHIP
119 if (addr->sa_family == AF_INET) {
120 struct ip_mreq mreq;
121
122 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
123 mreq.imr_interface.s_addr= INADDR_ANY;
124 if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
125 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP)");
126 return -1;
127 }
128 }
129 #endif
130 #if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
131 if (addr->sa_family == AF_INET6) {
132 struct ipv6_mreq mreq6;
133
134 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
135 mreq6.ipv6mr_interface= 0;
136 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
137 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP)");
138 return -1;
139 }
140 }
141 #endif
142 return 0;
143 }
144
145 static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr)
146 {
147 #ifdef IP_DROP_MEMBERSHIP
148 if (addr->sa_family == AF_INET) {
149 struct ip_mreq mreq;
150
151 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
152 mreq.imr_interface.s_addr= INADDR_ANY;
153 if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
154 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP)");
155 return -1;
156 }
157 }
158 #endif
159 #if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
160 if (addr->sa_family == AF_INET6) {
161 struct ipv6_mreq mreq6;
162
163 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
164 mreq6.ipv6mr_interface= 0;
165 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
166 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP)");
167 return -1;
168 }
169 }
170 #endif
171 return 0;
172 }
173
174 static struct addrinfo *udp_resolve_host(URLContext *h,
175 const char *hostname, int port,
176 int type, int family, int flags)
177 {
178 struct addrinfo hints = { 0 }, *res = 0;
179 int error;
180 char sport[16];
181 const char *node = 0, *service = "0";
182
183 if (port > 0) {
184 snprintf(sport, sizeof(sport), "%d", port);
185 service = sport;
186 }
187 if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
188 node = hostname;
189 }
190 hints.ai_socktype = type;
191 hints.ai_family = family;
192 hints.ai_flags = flags;
193 if ((error = getaddrinfo(node, service, &hints, &res))) {
194 res = NULL;
195 av_log(h, AV_LOG_ERROR, "getaddrinfo(%s, %s): %s\n",
196 node ? node : "unknown",
197 service ? service : "unknown",
198 gai_strerror(error));
199 }
200
201 return res;
202 }
203
204 static int udp_set_multicast_sources(URLContext *h,
205 int sockfd, struct sockaddr *addr,
206 int addr_len, char **sources,
207 int nb_sources, int include)
208 {
209 #if HAVE_STRUCT_GROUP_SOURCE_REQ && defined(MCAST_BLOCK_SOURCE) && !defined(_WIN32)
210 /* These ones are available in the microsoft SDK, but don't seem to work
211 * as on linux, so just prefer the v4-only approach there for now. */
212 int i;
213 for (i = 0; i < nb_sources; i++) {
214 struct group_source_req mreqs;
215 int level = addr->sa_family == AF_INET ? IPPROTO_IP : IPPROTO_IPV6;
216 struct addrinfo *sourceaddr = udp_resolve_host(h, sources[i], 0,
217 SOCK_DGRAM, AF_UNSPEC,
218 0);
219 if (!sourceaddr)
220 return AVERROR(ENOENT);
221
222 mreqs.gsr_interface = 0;
223 memcpy(&mreqs.gsr_group, addr, addr_len);
224 memcpy(&mreqs.gsr_source, sourceaddr->ai_addr, sourceaddr->ai_addrlen);
225 freeaddrinfo(sourceaddr);
226
227 if (setsockopt(sockfd, level,
228 include ? MCAST_JOIN_SOURCE_GROUP : MCAST_BLOCK_SOURCE,
229 (const void *)&mreqs, sizeof(mreqs)) < 0) {
230 if (include)
231 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_JOIN_SOURCE_GROUP)");
232 else
233 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(MCAST_BLOCK_SOURCE)");
234 return ff_neterrno();
235 }
236 }
237 #elif HAVE_STRUCT_IP_MREQ_SOURCE && defined(IP_BLOCK_SOURCE)
238 int i;
239 if (addr->sa_family != AF_INET) {
240 av_log(NULL, AV_LOG_ERROR,
241 "Setting multicast sources only supported for IPv4\n");
242 return AVERROR(EINVAL);
243 }
244 for (i = 0; i < nb_sources; i++) {
245 struct ip_mreq_source mreqs;
246 struct addrinfo *sourceaddr = udp_resolve_host(h, sources[i], 0,
247 SOCK_DGRAM, AF_UNSPEC,
248 0);
249 if (!sourceaddr)
250 return AVERROR(ENOENT);
251 if (sourceaddr->ai_addr->sa_family != AF_INET) {
252 freeaddrinfo(sourceaddr);
253 av_log(NULL, AV_LOG_ERROR, "%s is of incorrect protocol family\n",
254 sources[i]);
255 return AVERROR(EINVAL);
256 }
257
258 mreqs.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
259 mreqs.imr_interface.s_addr = INADDR_ANY;
260 mreqs.imr_sourceaddr.s_addr = ((struct sockaddr_in *)sourceaddr->ai_addr)->sin_addr.s_addr;
261 freeaddrinfo(sourceaddr);
262
263 if (setsockopt(sockfd, IPPROTO_IP,
264 include ? IP_ADD_SOURCE_MEMBERSHIP : IP_BLOCK_SOURCE,
265 (const void *)&mreqs, sizeof(mreqs)) < 0) {
266 if (include)
267 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_SOURCE_MEMBERSHIP)");
268 else
269 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_BLOCK_SOURCE)");
270 return ff_neterrno();
271 }
272 }
273 #else
274 return AVERROR(ENOSYS);
275 #endif
276 return 0;
277 }
278 static int udp_set_url(URLContext *h,
279 struct sockaddr_storage *addr,
280 const char *hostname, int port)
281 {
282 struct addrinfo *res0;
283 int addr_len;
284
285 res0 = udp_resolve_host(h, hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
286 if (res0 == 0) return AVERROR(EIO);
287 memcpy(addr, res0->ai_addr, res0->ai_addrlen);
288 addr_len = res0->ai_addrlen;
289 freeaddrinfo(res0);
290
291 return addr_len;
292 }
293
294 static int udp_socket_create(URLContext *h, struct sockaddr_storage *addr,
295 socklen_t *addr_len, const char *localaddr)
296 {
297 UDPContext *s = h->priv_data;
298 int udp_fd = -1;
299 struct addrinfo *res0 = NULL, *res = NULL;
300 int family = AF_UNSPEC;
301
302 if (((struct sockaddr *) &s->dest_addr)->sa_family)
303 family = ((struct sockaddr *) &s->dest_addr)->sa_family;
304 res0 = udp_resolve_host(h, (localaddr && localaddr[0]) ? localaddr : NULL,
305 s->local_port,
306 SOCK_DGRAM, family, AI_PASSIVE);
307 if (res0 == 0)
308 goto fail;
309 for (res = res0; res; res=res->ai_next) {
310 udp_fd = ff_socket(res->ai_family, SOCK_DGRAM, 0);
311 if (udp_fd != -1) break;
312 log_net_error(NULL, AV_LOG_ERROR, "socket");
313 }
314
315 if (udp_fd < 0)
316 goto fail;
317
318 memcpy(addr, res->ai_addr, res->ai_addrlen);
319 *addr_len = res->ai_addrlen;
320
321 freeaddrinfo(res0);
322
323 return udp_fd;
324
325 fail:
326 if (udp_fd >= 0)
327 closesocket(udp_fd);
328 if(res0)
329 freeaddrinfo(res0);
330 return -1;
331 }
332
333 static int udp_port(struct sockaddr_storage *addr, int addr_len)
334 {
335 char sbuf[sizeof(int)*3+1];
336 int error;
337
338 if ((error = getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0, sbuf, sizeof(sbuf), NI_NUMERICSERV)) != 0) {
339 av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", gai_strerror(error));
340 return -1;
341 }
342
343 return strtol(sbuf, NULL, 10);
344 }
345
346
347 /**
348 * If no filename is given to av_open_input_file because you want to
349 * get the local port first, then you must call this function to set
350 * the remote server address.
351 *
352 * url syntax: udp://host:port[?option=val...]
353 * option: 'ttl=n' : set the ttl value (for multicast only)
354 * 'localport=n' : set the local port
355 * 'pkt_size=n' : set max packet size
356 * 'reuse=1' : enable reusing the socket
357 *
358 * @param h media file context
359 * @param uri of the remote server
360 * @return zero if no error.
361 */
362 int ff_udp_set_remote_url(URLContext *h, const char *uri)
363 {
364 UDPContext *s = h->priv_data;
365 char hostname[256], buf[10];
366 int port;
367 const char *p;
368
369 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
370
371 /* set the destination address */
372 s->dest_addr_len = udp_set_url(h, &s->dest_addr, hostname, port);
373 if (s->dest_addr_len < 0) {
374 return AVERROR(EIO);
375 }
376 s->is_multicast = ff_is_multicast_address((struct sockaddr*) &s->dest_addr);
377 p = strchr(uri, '?');
378 if (p) {
379 if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
380 int was_connected = s->is_connected;
381 s->is_connected = strtol(buf, NULL, 10);
382 if (s->is_connected && !was_connected) {
383 if (connect(s->udp_fd, (struct sockaddr *) &s->dest_addr,
384 s->dest_addr_len)) {
385 s->is_connected = 0;
386 log_net_error(h, AV_LOG_ERROR, "connect");
387 return AVERROR(EIO);
388 }
389 }
390 }
391 }
392
393 return 0;
394 }
395
396 /**
397 * Return the local port used by the UDP connection
398 * @param h media file context
399 * @return the local port number
400 */
401 int ff_udp_get_local_port(URLContext *h)
402 {
403 UDPContext *s = h->priv_data;
404 return s->local_port;
405 }
406
407 /**
408 * Return the udp file handle for select() usage to wait for several RTP
409 * streams at the same time.
410 * @param h media file context
411 */
412 static int udp_get_file_handle(URLContext *h)
413 {
414 UDPContext *s = h->priv_data;
415 return s->udp_fd;
416 }
417
418 static int parse_source_list(char *buf, char **sources, int *num_sources,
419 int max_sources)
420 {
421 char *source_start;
422
423 source_start = buf;
424 while (1) {
425 char *next = strchr(source_start, ',');
426 if (next)
427 *next = '\0';
428 sources[*num_sources] = av_strdup(source_start);
429 if (!sources[*num_sources])
430 return AVERROR(ENOMEM);
431 source_start = next + 1;
432 (*num_sources)++;
433 if (*num_sources >= max_sources || !next)
434 break;
435 }
436 return 0;
437 }
438
439 /* put it in UDP context */
440 /* return non zero if error */
441 static int udp_open(URLContext *h, const char *uri, int flags)
442 {
443 char hostname[1024], localaddr[1024] = "";
444 int port, udp_fd = -1, tmp, bind_ret = -1;
445 UDPContext *s = h->priv_data;
446 int is_output;
447 const char *p;
448 char buf[256];
449 struct sockaddr_storage my_addr;
450 socklen_t len;
451 int i, num_include_sources = 0, num_exclude_sources = 0;
452 char *include_sources[32], *exclude_sources[32];
453
454 h->is_streamed = 1;
455 h->max_packet_size = 1472;
456
457 is_output = !(flags & AVIO_FLAG_READ);
458
459 if (s->buffer_size < 0)
460 s->buffer_size = is_output ? UDP_TX_BUF_SIZE : UDP_MAX_PKT_SIZE;
461
462 if (s->sources) {
463 if (parse_source_list(s->sources, include_sources,
464 &num_include_sources,
465 FF_ARRAY_ELEMS(include_sources)))
466 goto fail;
467 }
468
469 if (s->block) {
470 if (parse_source_list(s->block, exclude_sources, &num_exclude_sources,
471 FF_ARRAY_ELEMS(exclude_sources)))
472 goto fail;
473 }
474
475 if (s->pkt_size > 0)
476 h->max_packet_size = s->pkt_size;
477
478 p = strchr(uri, '?');
479 if (p) {
480 if (av_find_info_tag(buf, sizeof(buf), "reuse", p)) {
481 char *endptr = NULL;
482 s->reuse_socket = strtol(buf, &endptr, 10);
483 /* assume if no digits were found it is a request to enable it */
484 if (buf == endptr)
485 s->reuse_socket = 1;
486 }
487 if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) {
488 s->ttl = strtol(buf, NULL, 10);
489 }
490 if (av_find_info_tag(buf, sizeof(buf), "localport", p)) {
491 s->local_port = strtol(buf, NULL, 10);
492 }
493 if (av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
494 h->max_packet_size = strtol(buf, NULL, 10);
495 }
496 if (av_find_info_tag(buf, sizeof(buf), "buffer_size", p)) {
497 s->buffer_size = strtol(buf, NULL, 10);
498 }
499 if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
500 s->is_connected = strtol(buf, NULL, 10);
501 }
502 if (av_find_info_tag(buf, sizeof(buf), "localaddr", p)) {
503 av_strlcpy(localaddr, buf, sizeof(localaddr));
504 }
505 if (av_find_info_tag(buf, sizeof(buf), "sources", p)) {
506 if (parse_source_list(buf, include_sources, &num_include_sources,
507 FF_ARRAY_ELEMS(include_sources)))
508 goto fail;
509 }
510 if (av_find_info_tag(buf, sizeof(buf), "block", p)) {
511 if (parse_source_list(buf, exclude_sources, &num_exclude_sources,
512 FF_ARRAY_ELEMS(exclude_sources)))
513 goto fail;
514 }
515 }
516
517 /* fill the dest addr */
518 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
519
520 /* XXX: fix av_url_split */
521 if (hostname[0] == '\0' || hostname[0] == '?') {
522 /* only accepts null hostname if input */
523 if (!(flags & AVIO_FLAG_READ))
524 goto fail;
525 } else {
526 if (ff_udp_set_remote_url(h, uri) < 0)
527 goto fail;
528 }
529
530 if ((s->is_multicast || s->local_port < 0) && (h->flags & AVIO_FLAG_READ))
531 s->local_port = port;
532
533 if (localaddr[0])
534 udp_fd = udp_socket_create(h, &my_addr, &len, localaddr);
535 else
536 udp_fd = udp_socket_create(h, &my_addr, &len, s->localaddr);
537 if (udp_fd < 0)
538 goto fail;
539
540 /* Follow the requested reuse option, unless it's multicast in which
541 * case enable reuse unless explicitly disabled.
542 */
543 if (s->reuse_socket > 0 || (s->is_multicast && s->reuse_socket < 0)) {
544 s->reuse_socket = 1;
545 if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
546 goto fail;
547 }
548
549 /* If multicast, try binding the multicast address first, to avoid
550 * receiving UDP packets from other sources aimed at the same UDP
551 * port. This fails on windows. This makes sending to the same address
552 * using sendto() fail, so only do it if we're opened in read-only mode. */
553 if (s->is_multicast && !(h->flags & AVIO_FLAG_WRITE)) {
554 bind_ret = bind(udp_fd,(struct sockaddr *)&s->dest_addr, len);
555 }
556 /* bind to the local address if not multicast or if the multicast
557 * bind failed */
558 /* the bind is needed to give a port to the socket now */
559 if (bind_ret < 0 && bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0) {
560 log_net_error(h, AV_LOG_ERROR, "bind failed");
561 goto fail;
562 }
563
564 len = sizeof(my_addr);
565 getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
566 s->local_port = udp_port(&my_addr, len);
567
568 if (s->is_multicast) {
569 if (h->flags & AVIO_FLAG_WRITE) {
570 /* output */
571 if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
572 goto fail;
573 }
574 if (h->flags & AVIO_FLAG_READ) {
575 /* input */
576 if (num_include_sources && num_exclude_sources) {
577 av_log(h, AV_LOG_ERROR, "Simultaneously including and excluding multicast sources is not supported\n");
578 goto fail;
579 }
580 if (num_include_sources) {
581 if (udp_set_multicast_sources(h, udp_fd,
582 (struct sockaddr *)&s->dest_addr,
583 s->dest_addr_len,
584 include_sources,
585 num_include_sources, 1) < 0)
586 goto fail;
587 } else {
588 if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
589 goto fail;
590 }
591 if (num_exclude_sources) {
592 if (udp_set_multicast_sources(h, udp_fd,
593 (struct sockaddr *)&s->dest_addr,
594 s->dest_addr_len,
595 exclude_sources,
596 num_exclude_sources, 0) < 0)
597 goto fail;
598 }
599 }
600 }
601
602 if (is_output) {
603 /* limit the tx buf size to limit latency */
604 tmp = s->buffer_size;
605 if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
606 log_net_error(h, AV_LOG_ERROR, "setsockopt(SO_SNDBUF)");
607 goto fail;
608 }
609 } else {
610 /* set udp recv buffer size to the largest possible udp packet size to
611 * avoid losing data on OSes that set this too low by default. */
612 tmp = s->buffer_size;
613 if (setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp)) < 0) {
614 log_net_error(h, AV_LOG_WARNING, "setsockopt(SO_RECVBUF)");
615 }
616 /* make the socket non-blocking */
617 ff_socket_nonblock(udp_fd, 1);
618 }
619 if (s->is_connected) {
620 if (connect(udp_fd, (struct sockaddr *) &s->dest_addr, s->dest_addr_len)) {
621 log_net_error(h, AV_LOG_ERROR, "connect");
622 goto fail;
623 }
624 }
625
626 for (i = 0; i < num_include_sources; i++)
627 av_freep(&include_sources[i]);
628 for (i = 0; i < num_exclude_sources; i++)
629 av_freep(&exclude_sources[i]);
630
631 s->udp_fd = udp_fd;
632 return 0;
633 fail:
634 if (udp_fd >= 0)
635 closesocket(udp_fd);
636 for (i = 0; i < num_include_sources; i++)
637 av_freep(&include_sources[i]);
638 for (i = 0; i < num_exclude_sources; i++)
639 av_freep(&exclude_sources[i]);
640 return AVERROR(EIO);
641 }
642
643 static int udp_read(URLContext *h, uint8_t *buf, int size)
644 {
645 UDPContext *s = h->priv_data;
646 int ret;
647
648 if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
649 ret = ff_network_wait_fd(s->udp_fd, 0);
650 if (ret < 0)
651 return ret;
652 }
653 ret = recv(s->udp_fd, buf, size, 0);
654 return ret < 0 ? ff_neterrno() : ret;
655 }
656
657 static int udp_write(URLContext *h, const uint8_t *buf, int size)
658 {
659 UDPContext *s = h->priv_data;
660 int ret;
661
662 if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
663 ret = ff_network_wait_fd(s->udp_fd, 1);
664 if (ret < 0)
665 return ret;
666 }
667
668 if (!s->is_connected) {
669 ret = sendto (s->udp_fd, buf, size, 0,
670 (struct sockaddr *) &s->dest_addr,
671 s->dest_addr_len);
672 } else
673 ret = send(s->udp_fd, buf, size, 0);
674
675 return ret < 0 ? ff_neterrno() : ret;
676 }
677
678 static int udp_close(URLContext *h)
679 {
680 UDPContext *s = h->priv_data;
681
682 if (s->is_multicast && (h->flags & AVIO_FLAG_READ))
683 udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
684 closesocket(s->udp_fd);
685 return 0;
686 }
687
688 const URLProtocol ff_udp_protocol = {
689 .name = "udp",
690 .url_open = udp_open,
691 .url_read = udp_read,
692 .url_write = udp_write,
693 .url_close = udp_close,
694 .url_get_file_handle = udp_get_file_handle,
695 .priv_data_size = sizeof(UDPContext),
696 .flags = URL_PROTOCOL_FLAG_NETWORK,
697 .priv_data_class = &udp_class,
698 };