724ff0197d3f92b137a03b345ed1b692261818b1
[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 <unistd.h>
33 #include "internal.h"
34 #include "network.h"
35 #include "os_support.h"
36 #include "url.h"
37 #include <sys/time.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 {
45 int udp_fd;
46 int ttl;
47 int buffer_size;
48 int is_multicast;
49 int local_port;
50 int reuse_socket;
51 struct sockaddr_storage dest_addr;
52 int dest_addr_len;
53 int is_connected;
54 } UDPContext;
55
56 #define UDP_TX_BUF_SIZE 32768
57 #define UDP_MAX_PKT_SIZE 65536
58
59 static int udp_set_multicast_ttl(int sockfd, int mcastTTL,
60 struct sockaddr *addr)
61 {
62 #ifdef IP_MULTICAST_TTL
63 if (addr->sa_family == AF_INET) {
64 if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
65 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL): %s\n", strerror(errno));
66 return -1;
67 }
68 }
69 #endif
70 #if defined(IPPROTO_IPV6) && defined(IPV6_MULTICAST_HOPS)
71 if (addr->sa_family == AF_INET6) {
72 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
73 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS): %s\n", strerror(errno));
74 return -1;
75 }
76 }
77 #endif
78 return 0;
79 }
80
81 static int udp_join_multicast_group(int sockfd, struct sockaddr *addr)
82 {
83 #ifdef IP_ADD_MEMBERSHIP
84 if (addr->sa_family == AF_INET) {
85 struct ip_mreq mreq;
86
87 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
88 mreq.imr_interface.s_addr= INADDR_ANY;
89 if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
90 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP): %s\n", strerror(errno));
91 return -1;
92 }
93 }
94 #endif
95 #if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
96 if (addr->sa_family == AF_INET6) {
97 struct ipv6_mreq mreq6;
98
99 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
100 mreq6.ipv6mr_interface= 0;
101 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
102 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP): %s\n", strerror(errno));
103 return -1;
104 }
105 }
106 #endif
107 return 0;
108 }
109
110 static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr)
111 {
112 #ifdef IP_DROP_MEMBERSHIP
113 if (addr->sa_family == AF_INET) {
114 struct ip_mreq mreq;
115
116 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
117 mreq.imr_interface.s_addr= INADDR_ANY;
118 if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
119 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP): %s\n", strerror(errno));
120 return -1;
121 }
122 }
123 #endif
124 #if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
125 if (addr->sa_family == AF_INET6) {
126 struct ipv6_mreq mreq6;
127
128 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
129 mreq6.ipv6mr_interface= 0;
130 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
131 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP): %s\n", strerror(errno));
132 return -1;
133 }
134 }
135 #endif
136 return 0;
137 }
138
139 static struct addrinfo* udp_resolve_host(const char *hostname, int port,
140 int type, int family, int flags)
141 {
142 struct addrinfo hints, *res = 0;
143 int error;
144 char sport[16];
145 const char *node = 0, *service = "0";
146
147 if (port > 0) {
148 snprintf(sport, sizeof(sport), "%d", port);
149 service = sport;
150 }
151 if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
152 node = hostname;
153 }
154 memset(&hints, 0, sizeof(hints));
155 hints.ai_socktype = type;
156 hints.ai_family = family;
157 hints.ai_flags = flags;
158 if ((error = getaddrinfo(node, service, &hints, &res))) {
159 res = NULL;
160 av_log(NULL, AV_LOG_ERROR, "udp_resolve_host: %s\n", gai_strerror(error));
161 }
162
163 return res;
164 }
165
166 static int udp_set_url(struct sockaddr_storage *addr,
167 const char *hostname, int port)
168 {
169 struct addrinfo *res0;
170 int addr_len;
171
172 res0 = udp_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
173 if (res0 == 0) return AVERROR(EIO);
174 memcpy(addr, res0->ai_addr, res0->ai_addrlen);
175 addr_len = res0->ai_addrlen;
176 freeaddrinfo(res0);
177
178 return addr_len;
179 }
180
181 static int udp_socket_create(UDPContext *s,
182 struct sockaddr_storage *addr, int *addr_len)
183 {
184 int udp_fd = -1;
185 struct addrinfo *res0 = NULL, *res = NULL;
186 int family = AF_UNSPEC;
187
188 if (((struct sockaddr *) &s->dest_addr)->sa_family)
189 family = ((struct sockaddr *) &s->dest_addr)->sa_family;
190 res0 = udp_resolve_host(0, s->local_port, SOCK_DGRAM, family, AI_PASSIVE);
191 if (res0 == 0)
192 goto fail;
193 for (res = res0; res; res=res->ai_next) {
194 udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
195 if (udp_fd > 0) break;
196 av_log(NULL, AV_LOG_ERROR, "socket: %s\n", strerror(errno));
197 }
198
199 if (udp_fd < 0)
200 goto fail;
201
202 memcpy(addr, res->ai_addr, res->ai_addrlen);
203 *addr_len = res->ai_addrlen;
204
205 freeaddrinfo(res0);
206
207 return udp_fd;
208
209 fail:
210 if (udp_fd >= 0)
211 closesocket(udp_fd);
212 if(res0)
213 freeaddrinfo(res0);
214 return -1;
215 }
216
217 static int udp_port(struct sockaddr_storage *addr, int addr_len)
218 {
219 char sbuf[sizeof(int)*3+1];
220
221 if (getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0, sbuf, sizeof(sbuf), NI_NUMERICSERV) != 0) {
222 av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", strerror(errno));
223 return -1;
224 }
225
226 return strtol(sbuf, NULL, 10);
227 }
228
229
230 /**
231 * If no filename is given to av_open_input_file because you want to
232 * get the local port first, then you must call this function to set
233 * the remote server address.
234 *
235 * url syntax: udp://host:port[?option=val...]
236 * option: 'ttl=n' : set the ttl value (for multicast only)
237 * 'localport=n' : set the local port
238 * 'pkt_size=n' : set max packet size
239 * 'reuse=1' : enable reusing the socket
240 *
241 * @param h media file context
242 * @param uri of the remote server
243 * @return zero if no error.
244 */
245 int ff_udp_set_remote_url(URLContext *h, const char *uri)
246 {
247 UDPContext *s = h->priv_data;
248 char hostname[256], buf[10];
249 int port;
250 const char *p;
251
252 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
253
254 /* set the destination address */
255 s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port);
256 if (s->dest_addr_len < 0) {
257 return AVERROR(EIO);
258 }
259 s->is_multicast = ff_is_multicast_address((struct sockaddr*) &s->dest_addr);
260 p = strchr(uri, '?');
261 if (p) {
262 if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
263 int was_connected = s->is_connected;
264 s->is_connected = strtol(buf, NULL, 10);
265 if (s->is_connected && !was_connected) {
266 if (connect(s->udp_fd, (struct sockaddr *) &s->dest_addr,
267 s->dest_addr_len)) {
268 s->is_connected = 0;
269 av_log(h, AV_LOG_ERROR, "connect: %s\n", strerror(errno));
270 return AVERROR(EIO);
271 }
272 }
273 }
274 }
275
276 return 0;
277 }
278
279 /**
280 * Return the local port used by the UDP connection
281 * @param h media file context
282 * @return the local port number
283 */
284 int ff_udp_get_local_port(URLContext *h)
285 {
286 UDPContext *s = h->priv_data;
287 return s->local_port;
288 }
289
290 /**
291 * Return the udp file handle for select() usage to wait for several RTP
292 * streams at the same time.
293 * @param h media file context
294 */
295 static int udp_get_file_handle(URLContext *h)
296 {
297 UDPContext *s = h->priv_data;
298 return s->udp_fd;
299 }
300
301 /* put it in UDP context */
302 /* return non zero if error */
303 static int udp_open(URLContext *h, const char *uri, int flags)
304 {
305 char hostname[1024];
306 int port, udp_fd = -1, tmp, bind_ret = -1;
307 UDPContext *s = NULL;
308 int is_output;
309 const char *p;
310 char buf[256];
311 struct sockaddr_storage my_addr;
312 int len;
313 int reuse_specified = 0;
314
315 h->is_streamed = 1;
316 h->max_packet_size = 1472;
317
318 is_output = !(flags & AVIO_FLAG_READ);
319
320 s = av_mallocz(sizeof(UDPContext));
321 if (!s)
322 return AVERROR(ENOMEM);
323
324 h->priv_data = s;
325 s->ttl = 16;
326 s->buffer_size = is_output ? UDP_TX_BUF_SIZE : UDP_MAX_PKT_SIZE;
327
328 p = strchr(uri, '?');
329 if (p) {
330 if (av_find_info_tag(buf, sizeof(buf), "reuse", p)) {
331 const char *endptr=NULL;
332 s->reuse_socket = strtol(buf, &endptr, 10);
333 /* assume if no digits were found it is a request to enable it */
334 if (buf == endptr)
335 s->reuse_socket = 1;
336 reuse_specified = 1;
337 }
338 if (av_find_info_tag(buf, sizeof(buf), "ttl", p)) {
339 s->ttl = strtol(buf, NULL, 10);
340 }
341 if (av_find_info_tag(buf, sizeof(buf), "localport", p)) {
342 s->local_port = strtol(buf, NULL, 10);
343 }
344 if (av_find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
345 h->max_packet_size = strtol(buf, NULL, 10);
346 }
347 if (av_find_info_tag(buf, sizeof(buf), "buffer_size", p)) {
348 s->buffer_size = strtol(buf, NULL, 10);
349 }
350 if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
351 s->is_connected = strtol(buf, NULL, 10);
352 }
353 }
354
355 /* fill the dest addr */
356 av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
357
358 /* XXX: fix av_url_split */
359 if (hostname[0] == '\0' || hostname[0] == '?') {
360 /* only accepts null hostname if input */
361 if (!(flags & AVIO_FLAG_READ))
362 goto fail;
363 } else {
364 if (ff_udp_set_remote_url(h, uri) < 0)
365 goto fail;
366 }
367
368 if ((s->is_multicast || !s->local_port) && (h->flags & AVIO_FLAG_READ))
369 s->local_port = port;
370 udp_fd = udp_socket_create(s, &my_addr, &len);
371 if (udp_fd < 0)
372 goto fail;
373
374 /* Follow the requested reuse option, unless it's multicast in which
375 * case enable reuse unless explicitely disabled.
376 */
377 if (s->reuse_socket || (s->is_multicast && !reuse_specified)) {
378 s->reuse_socket = 1;
379 if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
380 goto fail;
381 }
382
383 /* the bind is needed to give a port to the socket now */
384 /* if multicast, try the multicast address bind first */
385 if (s->is_multicast && (h->flags & AVIO_FLAG_READ)) {
386 bind_ret = bind(udp_fd,(struct sockaddr *)&s->dest_addr, len);
387 }
388 /* bind to the local address if not multicast or if the multicast
389 * bind failed */
390 if (bind_ret < 0 && bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0)
391 goto fail;
392
393 len = sizeof(my_addr);
394 getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
395 s->local_port = udp_port(&my_addr, len);
396
397 if (s->is_multicast) {
398 if (!(h->flags & AVIO_FLAG_READ)) {
399 /* output */
400 if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
401 goto fail;
402 } else {
403 /* input */
404 if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
405 goto fail;
406 }
407 }
408
409 if (is_output) {
410 /* limit the tx buf size to limit latency */
411 tmp = s->buffer_size;
412 if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
413 av_log(h, AV_LOG_ERROR, "setsockopt(SO_SNDBUF): %s\n", strerror(errno));
414 goto fail;
415 }
416 } else {
417 /* set udp recv buffer size to the largest possible udp packet size to
418 * avoid losing data on OSes that set this too low by default. */
419 tmp = s->buffer_size;
420 if (setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp)) < 0) {
421 av_log(h, AV_LOG_WARNING, "setsockopt(SO_RECVBUF): %s\n", strerror(errno));
422 }
423 /* make the socket non-blocking */
424 ff_socket_nonblock(udp_fd, 1);
425 }
426 if (s->is_connected) {
427 if (connect(udp_fd, (struct sockaddr *) &s->dest_addr, s->dest_addr_len)) {
428 av_log(h, AV_LOG_ERROR, "connect: %s\n", strerror(errno));
429 goto fail;
430 }
431 }
432
433 s->udp_fd = udp_fd;
434 return 0;
435 fail:
436 if (udp_fd >= 0)
437 closesocket(udp_fd);
438 av_free(s);
439 return AVERROR(EIO);
440 }
441
442 static int udp_read(URLContext *h, uint8_t *buf, int size)
443 {
444 UDPContext *s = h->priv_data;
445 int ret;
446
447 if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
448 ret = ff_network_wait_fd(s->udp_fd, 0);
449 if (ret < 0)
450 return ret;
451 }
452 ret = recv(s->udp_fd, buf, size, 0);
453 return ret < 0 ? ff_neterrno() : ret;
454 }
455
456 static int udp_write(URLContext *h, const uint8_t *buf, int size)
457 {
458 UDPContext *s = h->priv_data;
459 int ret;
460
461 if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
462 ret = ff_network_wait_fd(s->udp_fd, 1);
463 if (ret < 0)
464 return ret;
465 }
466
467 if (!s->is_connected) {
468 ret = sendto (s->udp_fd, buf, size, 0,
469 (struct sockaddr *) &s->dest_addr,
470 s->dest_addr_len);
471 } else
472 ret = send(s->udp_fd, buf, size, 0);
473
474 return ret < 0 ? ff_neterrno() : ret;
475 }
476
477 static int udp_close(URLContext *h)
478 {
479 UDPContext *s = h->priv_data;
480
481 if (s->is_multicast && (h->flags & AVIO_FLAG_READ))
482 udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
483 closesocket(s->udp_fd);
484 av_free(s);
485 return 0;
486 }
487
488 URLProtocol ff_udp_protocol = {
489 .name = "udp",
490 .url_open = udp_open,
491 .url_read = udp_read,
492 .url_write = udp_write,
493 .url_close = udp_close,
494 .url_get_file_handle = udp_get_file_handle,
495 };