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