Libav
udp.c
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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 
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;
49  int pkt_size;
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 
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 
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) {
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 
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 
402 {
403  UDPContext *s = h->priv_data;
404  return s->local_port;
405 }
406 
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 
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),
697  .priv_data_class = &udp_class,
698 };
static int udp_open(URLContext *h, const char *uri, int flags)
Definition: udp.c:441
void av_url_split(char *proto, int proto_size, char *authorization, int authorization_size, char *hostname, int hostname_size, int *port_ptr, char *path, int path_size, const char *url)
Split a URL string into components.
Definition: utils.c:2870
static int udp_set_multicast_sources(URLContext *h, int sockfd, struct sockaddr *addr, int addr_len, char **sources, int nb_sources, int include)
Definition: udp.c:204
static void log_net_error(void *ctx, int level, const char *prefix)
Definition: udp.c:87
int size
#define URL_PROTOCOL_FLAG_NETWORK
Definition: url.h:34
#define NI_NUMERICSERV
Definition: network.h:172
AVOption.
Definition: opt.h:234
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:130
char * block
Definition: udp.c:58
int is_streamed
true if streamed (no seek possible), default = false
Definition: url.h:49
static int parse_source_list(char *buf, char **sources, int *num_sources, int max_sources)
Definition: udp.c:418
av_log(ac->avr, AV_LOG_TRACE, "%d samples - audio_convert: %s to %s (%s)\, len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic ? ac->func_descr_generic :ac->func_descr)
#define AVIO_FLAG_READ
read-only
Definition: avio.h:368
static int udp_set_url(URLContext *h, struct sockaddr_storage *addr, const char *hostname, int port)
Definition: udp.c:278
#define AVIO_FLAG_WRITE
write-only
Definition: avio.h:369
#define AI_PASSIVE
Definition: network.h:148
int flags
Definition: url.h:47
#define FF_ARRAY_ELEMS(a)
#define freeaddrinfo
Definition: network.h:187
int ff_socket(int af, int type, int proto)
Definition: network.c:141
void av_freep(void *arg)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:202
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:39
uint8_t
AVOptions.
miscellaneous OS support macros and functions.
int ff_udp_get_local_port(URLContext *h)
Return the local port used by the UDP connection.
Definition: udp.c:401
static int udp_port(struct sockaddr_storage *addr, int addr_len)
Definition: udp.c:333
static int flags
Definition: log.c:50
int av_find_info_tag(char *arg, int arg_size, const char *tag1, const char *info)
Attempt to find a specific tag in a URL.
Definition: parseutils.c:619
static int udp_close(URLContext *h)
Definition: udp.c:678
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:124
int ff_udp_set_remote_url(URLContext *h, const char *uri)
If no filename is given to av_open_input_file because you want to get the local port first...
Definition: udp.c:362
#define AVERROR(e)
Definition: error.h:43
#define E
Definition: udp.c:66
int reuse_socket
Definition: udp.c:52
#define UDP_TX_BUF_SIZE
Definition: udp.c:61
#define D
Definition: udp.c:65
static struct addrinfo * udp_resolve_host(URLContext *h, const char *hostname, int port, int type, int family, int flags)
Definition: udp.c:174
int dest_addr_len
Definition: udp.c:54
int ff_is_multicast_address(struct sockaddr *addr)
Definition: network.c:106
size_t av_strlcpy(char *dst, const char *src, size_t size)
Copy the string src to dst, but no more than size - 1 bytes, and null-terminate dst.
Definition: avstring.c:81
#define fail()
Definition: checkasm.h:80
#define OFFSET(x)
Definition: udp.c:64
char * localaddr
Definition: udp.c:56
int ai_addrlen
Definition: network.h:111
static const AVOption options[]
Definition: udp.c:67
#define ff_neterrno()
Definition: network.h:63
AVFormatContext * ctx
Definition: movenc.c:48
static int udp_get_file_handle(URLContext *h)
Return the udp file handle for select() usage to wait for several RTP streams at the same time...
Definition: udp.c:412
int is_connected
Definition: udp.c:55
Definition: udp.c:44
int ff_socket_nonblock(int socket, int enable)
LIBAVUTIL_VERSION_INT
Definition: eval.c:55
static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr)
Definition: udp.c:145
int ttl
Definition: udp.c:47
NULL
Definition: eval.c:55
#define IPV6_ADD_MEMBERSHIP
Definition: udp.c:40
char * av_strdup(const char *s)
Duplicate the string s.
Definition: mem.c:219
#define AVIO_FLAG_NONBLOCK
Use non-blocking mode.
Definition: avio.h:387
av_default_item_name
Definition: dnxhdenc.c:55
int local_port
Definition: udp.c:51
int pkt_size
Definition: udp.c:49
#define IPV6_DROP_MEMBERSHIP
Definition: udp.c:41
Definition: url.h:38
Describe the class of an AVClass context structure.
Definition: log.h:34
char * sources
Definition: udp.c:57
void * priv_data
Definition: url.h:45
#define gai_strerror
Definition: network.h:194
misc parsing utilities
const char * name
Definition: url.h:56
int ai_socktype
Definition: network.h:109
uint8_t level
Definition: svq3.c:204
int av_strerror(int errnum, char *errbuf, size_t errbuf_size)
Put a description of the AVERROR code errnum in errbuf.
Definition: error.c:23
#define getaddrinfo
Definition: network.h:186
Main libavformat public API header.
struct sockaddr_storage dest_addr
Definition: udp.c:53
static int udp_read(URLContext *h, uint8_t *buf, int size)
Definition: udp.c:643
struct addrinfo * ai_next
Definition: network.h:114
static int udp_set_multicast_ttl(int sockfd, int mcastTTL, struct sockaddr *addr)
Definition: udp.c:94
int udp_fd
Definition: udp.c:46
#define getnameinfo
Definition: network.h:188
int len
static uint8_t tmp[8]
Definition: des.c:38
int buffer_size
Definition: udp.c:48
static int udp_socket_create(URLContext *h, struct sockaddr_storage *addr, socklen_t *addr_len, const char *localaddr)
Definition: udp.c:294
int is_multicast
Definition: udp.c:50
int ai_flags
Definition: network.h:107
int max_packet_size
if non zero, the stream is packetized with this max packet size
Definition: url.h:48
static const AVClass udp_class
Definition: udp.c:80
#define UDP_MAX_PKT_SIZE
Definition: udp.c:62
int ff_network_wait_fd(int fd, int write)
Definition: network.c:68
unbuffered private I/O API
static int udp_join_multicast_group(int sockfd, struct sockaddr *addr)
Definition: udp.c:116
struct sockaddr * ai_addr
Definition: network.h:112
static int udp_write(URLContext *h, const uint8_t *buf, int size)
Definition: udp.c:657
const URLProtocol ff_udp_protocol
Definition: udp.c:688
int ai_family
Definition: network.h:108