2 * UDP prototype streaming system
3 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
5 * This file is part of Libav.
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.
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.
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
27 #define _BSD_SOURCE /* Needed for using struct ip_mreq with recent glibc */
30 #include "avio_internal.h"
31 #include "libavutil/parseutils.h"
32 #include "libavutil/avstring.h"
35 #include "os_support.h"
38 #ifndef IPV6_ADD_MEMBERSHIP
39 #define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
40 #define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
50 struct sockaddr_storage dest_addr;
55 #define UDP_TX_BUF_SIZE 32768
56 #define UDP_MAX_PKT_SIZE 65536
58 static void log_net_error(void *ctx, int level, const char* prefix)
61 av_strerror(ff_neterrno(), errbuf, sizeof(errbuf));
62 av_log(ctx, level, "%s: %s\n", prefix, errbuf);
65 static int udp_set_multicast_ttl(int sockfd, int mcastTTL,
66 struct sockaddr *addr)
68 #ifdef IP_MULTICAST_TTL
69 if (addr->sa_family == AF_INET) {
70 if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
71 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL)");
76 #if defined(IPPROTO_IPV6) && defined(IPV6_MULTICAST_HOPS)
77 if (addr->sa_family == AF_INET6) {
78 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
79 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS)");
87 static int udp_join_multicast_group(int sockfd, struct sockaddr *addr)
89 #ifdef IP_ADD_MEMBERSHIP
90 if (addr->sa_family == AF_INET) {
93 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
94 mreq.imr_interface.s_addr= INADDR_ANY;
95 if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
96 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP)");
101 #if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
102 if (addr->sa_family == AF_INET6) {
103 struct ipv6_mreq mreq6;
105 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
106 mreq6.ipv6mr_interface= 0;
107 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
108 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP)");
116 static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr)
118 #ifdef IP_DROP_MEMBERSHIP
119 if (addr->sa_family == AF_INET) {
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_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
125 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP)");
130 #if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
131 if (addr->sa_family == AF_INET6) {
132 struct ipv6_mreq mreq6;
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_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
137 log_net_error(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP)");
145 static struct addrinfo* udp_resolve_host(const char *hostname, int port,
146 int type, int family, int flags)
148 struct addrinfo hints = { 0 }, *res = 0;
151 const char *node = 0, *service = "0";
154 snprintf(sport, sizeof(sport), "%d", port);
157 if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
160 hints.ai_socktype = type;
161 hints.ai_family = family;
162 hints.ai_flags = flags;
163 if ((error = getaddrinfo(node, service, &hints, &res))) {
165 av_log(NULL, AV_LOG_ERROR, "udp_resolve_host: %s\n", gai_strerror(error));
171 static int udp_set_url(struct sockaddr_storage *addr,
172 const char *hostname, int port)
174 struct addrinfo *res0;
177 res0 = udp_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
178 if (res0 == 0) return AVERROR(EIO);
179 memcpy(addr, res0->ai_addr, res0->ai_addrlen);
180 addr_len = res0->ai_addrlen;
186 static int udp_socket_create(UDPContext *s, struct sockaddr_storage *addr,
187 int *addr_len, const char *localaddr)
190 struct addrinfo *res0 = NULL, *res = NULL;
191 int family = AF_UNSPEC;
193 if (((struct sockaddr *) &s->dest_addr)->sa_family)
194 family = ((struct sockaddr *) &s->dest_addr)->sa_family;
195 res0 = udp_resolve_host(localaddr[0] ? localaddr : NULL, s->local_port,
196 SOCK_DGRAM, family, AI_PASSIVE);
199 for (res = res0; res; res=res->ai_next) {
200 udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
201 if (udp_fd != -1) break;
202 log_net_error(NULL, AV_LOG_ERROR, "socket");
208 memcpy(addr, res->ai_addr, res->ai_addrlen);
209 *addr_len = res->ai_addrlen;
223 static int udp_port(struct sockaddr_storage *addr, int addr_len)
225 char sbuf[sizeof(int)*3+1];
228 if ((error = getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0, sbuf, sizeof(sbuf), NI_NUMERICSERV)) != 0) {
229 av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", gai_strerror(error));
233 return strtol(sbuf, NULL, 10);
238 * If no filename is given to av_open_input_file because you want to
239 * get the local port first, then you must call this function to set
240 * the remote server address.
242 * url syntax: udp://host:port[?option=val...]
243 * option: 'ttl=n' : set the ttl value (for multicast only)
244 * 'localport=n' : set the local port
245 * 'pkt_size=n' : set max packet size
246 * 'reuse=1' : enable reusing the socket
248 * @param h media file context
249 * @param uri of the remote server
250 * @return zero if no error.
252 int ff_udp_set_remote_url(URLContext *h, const char *uri)
254 UDPContext *s = h->priv_data;
255 char hostname[256], buf[10];
259 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
261 /* set the destination address */
262 s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port);
263 if (s->dest_addr_len < 0) {
266 s->is_multicast = ff_is_multicast_address((struct sockaddr*) &s->dest_addr);
267 p = strchr(uri, '?');
269 if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
270 int was_connected = s->is_connected;
271 s->is_connected = strtol(buf, NULL, 10);
272 if (s->is_connected && !was_connected) {
273 if (connect(s->udp_fd, (struct sockaddr *) &s->dest_addr,
276 log_net_error(h, AV_LOG_ERROR, "connect");
287 * Return the local port used by the UDP connection
288 * @param h media file context
289 * @return the local port number
291 int ff_udp_get_local_port(URLContext *h)
293 UDPContext *s = h->priv_data;
294 return s->local_port;
298 * Return the udp file handle for select() usage to wait for several RTP
299 * streams at the same time.
300 * @param h media file context
302 static int udp_get_file_handle(URLContext *h)
304 UDPContext *s = h->priv_data;
308 /* put it in UDP context */
309 /* return non zero if error */
310 static int udp_open(URLContext *h, const char *uri, int flags)
312 char hostname[1024], localaddr[1024] = "";
313 int port, udp_fd = -1, tmp, bind_ret = -1;
314 UDPContext *s = h->priv_data;
318 struct sockaddr_storage my_addr;
320 int reuse_specified = 0;
323 h->max_packet_size = 1472;
325 is_output = !(flags & AVIO_FLAG_READ);
328 s->buffer_size = is_output ? UDP_TX_BUF_SIZE : UDP_MAX_PKT_SIZE;
330 p = strchr(uri, '?');
332 if (av_find_info_tag(buf, sizeof(buf), "reuse", p)) {
334 s->reuse_socket = strtol(buf, &endptr, 10);
335 /* assume if no digits were found it is a request to enable it */
340 if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) {
341 s->ttl = strtol(buf, NULL, 10);
343 if (av_find_info_tag(buf, sizeof(buf), "localport", p)) {
344 s->local_port = strtol(buf, NULL, 10);
346 if (av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
347 h->max_packet_size = strtol(buf, NULL, 10);
349 if (av_find_info_tag(buf, sizeof(buf), "buffer_size", p)) {
350 s->buffer_size = strtol(buf, NULL, 10);
352 if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
353 s->is_connected = strtol(buf, NULL, 10);
355 if (av_find_info_tag(buf, sizeof(buf), "localaddr", p)) {
356 av_strlcpy(localaddr, buf, sizeof(localaddr));
360 /* fill the dest addr */
361 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
363 /* XXX: fix av_url_split */
364 if (hostname[0] == '\0' || hostname[0] == '?') {
365 /* only accepts null hostname if input */
366 if (!(flags & AVIO_FLAG_READ))
369 if (ff_udp_set_remote_url(h, uri) < 0)
373 if ((s->is_multicast || !s->local_port) && (h->flags & AVIO_FLAG_READ))
374 s->local_port = port;
375 udp_fd = udp_socket_create(s, &my_addr, &len, localaddr);
379 /* Follow the requested reuse option, unless it's multicast in which
380 * case enable reuse unless explicitly disabled.
382 if (s->reuse_socket || (s->is_multicast && !reuse_specified)) {
384 if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
388 /* If multicast, try binding the multicast address first, to avoid
389 * receiving UDP packets from other sources aimed at the same UDP
390 * port. This fails on windows. This makes sending to the same address
391 * using sendto() fail, so only do it if we're opened in read-only mode. */
392 if (s->is_multicast && !(h->flags & AVIO_FLAG_WRITE)) {
393 bind_ret = bind(udp_fd,(struct sockaddr *)&s->dest_addr, len);
395 /* bind to the local address if not multicast or if the multicast
397 /* the bind is needed to give a port to the socket now */
398 if (bind_ret < 0 && bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0) {
399 log_net_error(h, AV_LOG_ERROR, "bind failed");
403 len = sizeof(my_addr);
404 getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
405 s->local_port = udp_port(&my_addr, len);
407 if (s->is_multicast) {
408 if (h->flags & AVIO_FLAG_WRITE) {
410 if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
413 if (h->flags & AVIO_FLAG_READ) {
415 if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
421 /* limit the tx buf size to limit latency */
422 tmp = s->buffer_size;
423 if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
424 log_net_error(h, AV_LOG_ERROR, "setsockopt(SO_SNDBUF)");
428 /* set udp recv buffer size to the largest possible udp packet size to
429 * avoid losing data on OSes that set this too low by default. */
430 tmp = s->buffer_size;
431 if (setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp)) < 0) {
432 log_net_error(h, AV_LOG_WARNING, "setsockopt(SO_RECVBUF)");
434 /* make the socket non-blocking */
435 ff_socket_nonblock(udp_fd, 1);
437 if (s->is_connected) {
438 if (connect(udp_fd, (struct sockaddr *) &s->dest_addr, s->dest_addr_len)) {
439 log_net_error(h, AV_LOG_ERROR, "connect");
452 static int udp_read(URLContext *h, uint8_t *buf, int size)
454 UDPContext *s = h->priv_data;
457 if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
458 ret = ff_network_wait_fd(s->udp_fd, 0);
462 ret = recv(s->udp_fd, buf, size, 0);
463 return ret < 0 ? ff_neterrno() : ret;
466 static int udp_write(URLContext *h, const uint8_t *buf, int size)
468 UDPContext *s = h->priv_data;
471 if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
472 ret = ff_network_wait_fd(s->udp_fd, 1);
477 if (!s->is_connected) {
478 ret = sendto (s->udp_fd, buf, size, 0,
479 (struct sockaddr *) &s->dest_addr,
482 ret = send(s->udp_fd, buf, size, 0);
484 return ret < 0 ? ff_neterrno() : ret;
487 static int udp_close(URLContext *h)
489 UDPContext *s = h->priv_data;
491 if (s->is_multicast && (h->flags & AVIO_FLAG_READ))
492 udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
493 closesocket(s->udp_fd);
497 URLProtocol ff_udp_protocol = {
499 .url_open = udp_open,
500 .url_read = udp_read,
501 .url_write = udp_write,
502 .url_close = udp_close,
503 .url_get_file_handle = udp_get_file_handle,
504 .priv_data_size = sizeof(UDPContext),
505 .flags = URL_PROTOCOL_FLAG_NETWORK,