17301307300dbd1a62c32d8719b7c3da7a701f5d
[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 FFmpeg.
6 *
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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 udp.c
24 * UDP protocol
25 */
26
27 #include "avformat.h"
28 #include <unistd.h>
29 #include "network.h"
30 #include "os_support.h"
31
32 #ifndef IPV6_ADD_MEMBERSHIP
33 #define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
34 #define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
35 #endif
36 #ifndef IN_MULTICAST
37 #define IN_MULTICAST(a) ((((uint32_t)(a)) & 0xf0000000) == 0xe0000000)
38 #endif
39 #ifndef IN6_IS_ADDR_MULTICAST
40 #define IN6_IS_ADDR_MULTICAST(a) (((uint8_t *) (a))[0] == 0xff)
41 #endif
42
43 typedef struct {
44 int udp_fd;
45 int ttl;
46 int is_multicast;
47 int local_port;
48 int reuse_socket;
49 #ifndef CONFIG_IPV6
50 struct sockaddr_in dest_addr;
51 #else
52 struct sockaddr_storage dest_addr;
53 #endif
54 int dest_addr_len;
55 } UDPContext;
56
57 #define UDP_TX_BUF_SIZE 32768
58 #define UDP_MAX_PKT_SIZE 65536
59
60 static int udp_set_multicast_ttl(int sockfd, int mcastTTL, struct sockaddr *addr) {
61 #ifdef IP_MULTICAST_TTL
62 if (addr->sa_family == AF_INET) {
63 if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
64 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL): %s\n", strerror(errno));
65 return -1;
66 }
67 }
68 #endif
69 #ifdef CONFIG_IPV6
70 if (addr->sa_family == AF_INET6) {
71 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
72 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS): %s\n", strerror(errno));
73 return -1;
74 }
75 }
76 #endif
77 return 0;
78 }
79
80 static int udp_join_multicast_group(int sockfd, struct sockaddr *addr) {
81 #ifdef IP_ADD_MEMBERSHIP
82 if (addr->sa_family == AF_INET) {
83 struct ip_mreq mreq;
84
85 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
86 mreq.imr_interface.s_addr= INADDR_ANY;
87 if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
88 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP): %s\n", strerror(errno));
89 return -1;
90 }
91 }
92 #endif
93 #ifdef CONFIG_IPV6
94 if (addr->sa_family == AF_INET6) {
95 struct ipv6_mreq mreq6;
96
97 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
98 mreq6.ipv6mr_interface= 0;
99 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
100 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP): %s\n", strerror(errno));
101 return -1;
102 }
103 }
104 #endif
105 return 0;
106 }
107
108 static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr) {
109 #ifdef IP_DROP_MEMBERSHIP
110 if (addr->sa_family == AF_INET) {
111 struct ip_mreq mreq;
112
113 mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
114 mreq.imr_interface.s_addr= INADDR_ANY;
115 if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
116 av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP): %s\n", strerror(errno));
117 return -1;
118 }
119 }
120 #endif
121 #ifdef CONFIG_IPV6
122 if (addr->sa_family == AF_INET6) {
123 struct ipv6_mreq mreq6;
124
125 memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
126 mreq6.ipv6mr_interface= 0;
127 if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
128 av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP): %s\n", strerror(errno));
129 return -1;
130 }
131 }
132 #endif
133 return 0;
134 }
135
136 #ifdef CONFIG_IPV6
137 static struct addrinfo* udp_ipv6_resolve_host(const char *hostname, int port, int type, int family, int flags) {
138 struct addrinfo hints, *res = 0;
139 int error;
140 char sport[16];
141 const char *node = 0, *service = "0";
142
143 if (port > 0) {
144 snprintf(sport, sizeof(sport), "%d", port);
145 service = sport;
146 }
147 if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
148 node = hostname;
149 }
150 memset(&hints, 0, sizeof(hints));
151 hints.ai_socktype = type;
152 hints.ai_family = family;
153 hints.ai_flags = flags;
154 if ((error = getaddrinfo(node, service, &hints, &res))) {
155 av_log(NULL, AV_LOG_ERROR, "udp_ipv6_resolve_host: %s\n", gai_strerror(error));
156 }
157
158 return res;
159 }
160
161 static int udp_set_url(struct sockaddr_storage *addr, const char *hostname, int port) {
162 struct addrinfo *res0;
163 int addr_len;
164
165 res0 = udp_ipv6_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
166 if (res0 == 0) return AVERROR(EIO);
167 memcpy(addr, res0->ai_addr, res0->ai_addrlen);
168 addr_len = res0->ai_addrlen;
169 freeaddrinfo(res0);
170
171 return addr_len;
172 }
173
174 static int is_multicast_address(struct sockaddr_storage *addr)
175 {
176 if (addr->ss_family == AF_INET) {
177 return IN_MULTICAST(ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr));
178 }
179 if (addr->ss_family == AF_INET6) {
180 return IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)addr)->sin6_addr);
181 }
182
183 return 0;
184 }
185
186 static int udp_socket_create(UDPContext *s, struct sockaddr_storage *addr, int *addr_len)
187 {
188 int udp_fd = -1;
189 struct addrinfo *res0 = NULL, *res = NULL;
190 int family = AF_UNSPEC;
191
192 if (((struct sockaddr *) &s->dest_addr)->sa_family)
193 family = ((struct sockaddr *) &s->dest_addr)->sa_family;
194 res0 = udp_ipv6_resolve_host(0, s->local_port, SOCK_DGRAM, family, AI_PASSIVE);
195 if (res0 == 0)
196 goto fail;
197 for (res = res0; res; res=res->ai_next) {
198 udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
199 if (udp_fd > 0) break;
200 av_log(NULL, AV_LOG_ERROR, "socket: %s\n", strerror(errno));
201 }
202
203 if (udp_fd < 0)
204 goto fail;
205
206 memcpy(addr, res->ai_addr, res->ai_addrlen);
207 *addr_len = res->ai_addrlen;
208
209 freeaddrinfo(res0);
210
211 return udp_fd;
212
213 fail:
214 if (udp_fd >= 0)
215 closesocket(udp_fd);
216 if(res0)
217 freeaddrinfo(res0);
218 return -1;
219 }
220
221 static int udp_port(struct sockaddr_storage *addr, int addr_len)
222 {
223 char sbuf[sizeof(int)*3+1];
224
225 if (getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0, sbuf, sizeof(sbuf), NI_NUMERICSERV) != 0) {
226 av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", strerror(errno));
227 return -1;
228 }
229
230 return strtol(sbuf, NULL, 10);
231 }
232
233 #else
234
235 static int udp_set_url(struct sockaddr_in *addr, const char *hostname, int port)
236 {
237 /* set the destination address */
238 if (resolve_host(&addr->sin_addr, hostname) < 0)
239 return AVERROR(EIO);
240 addr->sin_family = AF_INET;
241 addr->sin_port = htons(port);
242
243 return sizeof(struct sockaddr_in);
244 }
245
246 static int is_multicast_address(struct sockaddr_in *addr)
247 {
248 return IN_MULTICAST(ntohl(addr->sin_addr.s_addr));
249 }
250
251 static int udp_socket_create(UDPContext *s, struct sockaddr_in *addr, int *addr_len)
252 {
253 int fd;
254
255 fd = socket(AF_INET, SOCK_DGRAM, 0);
256 if (fd < 0)
257 return -1;
258
259 addr->sin_family = AF_INET;
260 addr->sin_addr.s_addr = htonl (INADDR_ANY);
261 addr->sin_port = htons(s->local_port);
262 *addr_len = sizeof(struct sockaddr_in);
263
264 return fd;
265 }
266
267 static int udp_port(struct sockaddr_in *addr, int len)
268 {
269 return ntohs(addr->sin_port);
270 }
271 #endif /* CONFIG_IPV6 */
272
273
274 /**
275 * If no filename is given to av_open_input_file because you want to
276 * get the local port first, then you must call this function to set
277 * the remote server address.
278 *
279 * url syntax: udp://host:port[?option=val...]
280 * option: 'ttl=n' : set the ttl value (for multicast only)
281 * 'localport=n' : set the local port
282 * 'pkt_size=n' : set max packet size
283 * 'reuse=1' : enable reusing the socket
284 *
285 * @param s1 media file context
286 * @param uri of the remote server
287 * @return zero if no error.
288 */
289 int udp_set_remote_url(URLContext *h, const char *uri)
290 {
291 UDPContext *s = h->priv_data;
292 char hostname[256];
293 int port;
294
295 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
296
297 /* set the destination address */
298 s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port);
299 if (s->dest_addr_len < 0) {
300 return AVERROR(EIO);
301 }
302 s->is_multicast = is_multicast_address(&s->dest_addr);
303
304 return 0;
305 }
306
307 /**
308 * Return the local port used by the UDP connexion
309 * @param s1 media file context
310 * @return the local port number
311 */
312 int udp_get_local_port(URLContext *h)
313 {
314 UDPContext *s = h->priv_data;
315 return s->local_port;
316 }
317
318 /**
319 * Return the udp file handle for select() usage to wait for several RTP
320 * streams at the same time.
321 * @param h media file context
322 */
323 int udp_get_file_handle(URLContext *h)
324 {
325 UDPContext *s = h->priv_data;
326 return s->udp_fd;
327 }
328
329 /* put it in UDP context */
330 /* return non zero if error */
331 static int udp_open(URLContext *h, const char *uri, int flags)
332 {
333 char hostname[1024];
334 int port, udp_fd = -1, tmp;
335 UDPContext *s = NULL;
336 int is_output;
337 const char *p;
338 char buf[256];
339 #ifndef CONFIG_IPV6
340 struct sockaddr_in my_addr;
341 #else
342 struct sockaddr_storage my_addr;
343 #endif
344 int len;
345
346 h->is_streamed = 1;
347 h->max_packet_size = 1472;
348
349 is_output = (flags & URL_WRONLY);
350
351 if(!ff_network_init())
352 return AVERROR(EIO);
353
354 s = av_mallocz(sizeof(UDPContext));
355 if (!s)
356 return AVERROR(ENOMEM);
357
358 h->priv_data = s;
359 s->ttl = 16;
360 p = strchr(uri, '?');
361 if (p) {
362 s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
363 if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
364 s->ttl = strtol(buf, NULL, 10);
365 }
366 if (find_info_tag(buf, sizeof(buf), "localport", p)) {
367 s->local_port = strtol(buf, NULL, 10);
368 }
369 if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
370 h->max_packet_size = strtol(buf, NULL, 10);
371 }
372 }
373
374 /* fill the dest addr */
375 url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
376
377 /* XXX: fix url_split */
378 if (hostname[0] == '\0' || hostname[0] == '?') {
379 /* only accepts null hostname if input */
380 if (flags & URL_WRONLY)
381 goto fail;
382 } else {
383 udp_set_remote_url(h, uri);
384 }
385
386 if (s->is_multicast && !(h->flags & URL_WRONLY))
387 s->local_port = port;
388 udp_fd = udp_socket_create(s, &my_addr, &len);
389 if (udp_fd < 0)
390 goto fail;
391
392 if (s->reuse_socket)
393 if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
394 goto fail;
395
396 /* the bind is needed to give a port to the socket now */
397 if (bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0)
398 goto fail;
399
400 len = sizeof(my_addr);
401 getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
402 s->local_port = udp_port(&my_addr, len);
403
404 if (s->is_multicast) {
405 if (h->flags & URL_WRONLY) {
406 /* output */
407 if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
408 goto fail;
409 } else {
410 /* input */
411 if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
412 goto fail;
413 }
414 }
415
416 if (is_output) {
417 /* limit the tx buf size to limit latency */
418 tmp = UDP_TX_BUF_SIZE;
419 if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
420 av_log(NULL, AV_LOG_ERROR, "setsockopt(SO_SNDBUF): %s\n", strerror(errno));
421 goto fail;
422 }
423 } else {
424 /* set udp recv buffer size to the largest possible udp packet size to
425 * avoid losing data on OSes that set this too low by default. */
426 tmp = UDP_MAX_PKT_SIZE;
427 setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp));
428 }
429
430 s->udp_fd = udp_fd;
431 return 0;
432 fail:
433 if (udp_fd >= 0)
434 closesocket(udp_fd);
435 av_free(s);
436 return AVERROR(EIO);
437 }
438
439 static int udp_read(URLContext *h, uint8_t *buf, int size)
440 {
441 UDPContext *s = h->priv_data;
442 int len;
443
444 for(;;) {
445 len = recv(s->udp_fd, buf, size, 0);
446 if (len < 0) {
447 if (ff_neterrno() != FF_NETERROR(EAGAIN) &&
448 ff_neterrno() != FF_NETERROR(EINTR))
449 return AVERROR(EIO);
450 } else {
451 break;
452 }
453 }
454 return len;
455 }
456
457 static int udp_write(URLContext *h, uint8_t *buf, int size)
458 {
459 UDPContext *s = h->priv_data;
460 int ret;
461
462 for(;;) {
463 ret = sendto (s->udp_fd, buf, size, 0,
464 (struct sockaddr *) &s->dest_addr,
465 s->dest_addr_len);
466 if (ret < 0) {
467 if (ff_neterrno() != FF_NETERROR(EINTR) &&
468 ff_neterrno() != FF_NETERROR(EAGAIN))
469 return AVERROR(EIO);
470 } else {
471 break;
472 }
473 }
474 return size;
475 }
476
477 static int udp_close(URLContext *h)
478 {
479 UDPContext *s = h->priv_data;
480
481 if (s->is_multicast && !(h->flags & URL_WRONLY))
482 udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
483 closesocket(s->udp_fd);
484 ff_network_close();
485 av_free(s);
486 return 0;
487 }
488
489 URLProtocol udp_protocol = {
490 "udp",
491 udp_open,
492 udp_read,
493 udp_write,
494 NULL, /* seek */
495 udp_close,
496 };