Statistics
| Branch: | Revision:

ffmpeg / libavformat / udp.c @ 0ec12335

History | View | Annotate | Download (14.1 KB)

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 ip_mreq mreq;
38
    struct sockaddr_in dest_addr;
39
#else
40
    struct sockaddr_storage dest_addr;
41
#endif
42
    size_t dest_addr_len;
43
} UDPContext;
44

    
45
#define UDP_TX_BUF_SIZE 32768
46
#define UDP_MAX_PKT_SIZE 65536
47

    
48
#ifdef CONFIG_IPV6
49

    
50
static int udp_ipv6_set_multicast_ttl(int sockfd, int mcastTTL, struct sockaddr *addr) {
51
    if (addr->sa_family == AF_INET) {
52
        if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
53
            perror("setsockopt(IP_MULTICAST_TTL)");
54
            return -1;
55
        }
56
    }
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
    return 0;
64
}
65

    
66
static int udp_ipv6_join_multicast_group(int sockfd, struct sockaddr *addr) {
67
    struct ip_mreq   mreq;
68
    struct ipv6_mreq mreq6;
69
    if (addr->sa_family == AF_INET) {
70
        mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
71
        mreq.imr_interface.s_addr= INADDR_ANY;
72
        if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
73
            perror("setsockopt(IP_ADD_MEMBERSHIP)");
74
            return -1;
75
        }
76
    }
77
    if (addr->sa_family == AF_INET6) {
78
        memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
79
        mreq6.ipv6mr_interface= 0;
80
        if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
81
            perror("setsockopt(IPV6_ADD_MEMBERSHIP)");
82
            return -1;
83
        }
84
    }
85
    return 0;
86
}
87

    
88
static int udp_ipv6_leave_multicast_group(int sockfd, struct sockaddr *addr) {
89
    struct ip_mreq   mreq;
90
    struct ipv6_mreq mreq6;
91
    if (addr->sa_family == AF_INET) {
92
        mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
93
        mreq.imr_interface.s_addr= INADDR_ANY;
94
        if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
95
            perror("setsockopt(IP_DROP_MEMBERSHIP)");
96
            return -1;
97
        }
98
    }
99
    if (addr->sa_family == AF_INET6) {
100
        memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
101
        mreq6.ipv6mr_interface= 0;
102
        if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
103
            perror("setsockopt(IPV6_DROP_MEMBERSHIP)");
104
            return -1;
105
        }
106
    }
107
    return 0;
108
}
109

    
110
static struct addrinfo* udp_ipv6_resolve_host(const char *hostname, int port, int type, int family, int flags) {
111
    struct addrinfo hints, *res = 0;
112
    int error;
113
    char sport[16];
114
    const char *node = 0, *service = "0";
115

    
116
    if (port > 0) {
117
        snprintf(sport, sizeof(sport), "%d", port);
118
        service = sport;
119
    }
120
    if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
121
        node = hostname;
122
    }
123
    memset(&hints, 0, sizeof(hints));
124
    hints.ai_socktype = type;
125
    hints.ai_family   = family;
126
    hints.ai_flags = flags;
127
    if ((error = getaddrinfo(node, service, &hints, &res))) {
128
        av_log(NULL, AV_LOG_ERROR, "udp_ipv6_resolve_host: %s\n", gai_strerror(error));
129
    }
130

    
131
    return res;
132
}
133

    
134
static int udp_ipv6_set_remote_url(URLContext *h, const char *uri) {
135
    UDPContext *s = h->priv_data;
136
    char hostname[256];
137
    int port;
138
    struct addrinfo *res0;
139
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
140
    res0 = udp_ipv6_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
141
    if (res0 == 0) return AVERROR(EIO);
142
    memcpy(&s->dest_addr, res0->ai_addr, res0->ai_addrlen);
143
    s->dest_addr_len = res0->ai_addrlen;
144
    freeaddrinfo(res0);
145
    return 0;
146
}
147

    
148
static int udp_ipv6_set_local(URLContext *h) {
149
    UDPContext *s = h->priv_data;
150
    int udp_fd = -1;
151
    struct sockaddr_storage clientaddr;
152
    socklen_t addrlen;
153
    char sbuf[NI_MAXSERV];
154
    char hbuf[NI_MAXHOST];
155
    struct addrinfo *res0 = NULL, *res = NULL;
156
    int family = AF_UNSPEC;
157

    
158
    if (((struct sockaddr *) &s->dest_addr)->sa_family)
159
        family = ((struct sockaddr *) &s->dest_addr)->sa_family;
160
    res0 = udp_ipv6_resolve_host(0, s->local_port, SOCK_DGRAM, family, AI_PASSIVE);
161
    if (res0 == 0)
162
        goto fail;
163
    for (res = res0; res; res=res->ai_next) {
164
        udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
165
        if (udp_fd > 0) break;
166
        perror("socket");
167
    }
168

    
169
    if (udp_fd < 0)
170
        goto fail;
171

    
172
    if (bind(udp_fd, res0->ai_addr, res0->ai_addrlen) < 0) {
173
        perror("bind");
174
        goto fail;
175
    }
176
    freeaddrinfo(res0);
177
        res0 = NULL;
178

    
179
    addrlen = sizeof(clientaddr);
180
    if (getsockname(udp_fd, (struct sockaddr *)&clientaddr, &addrlen) < 0) {
181
        perror("getsockname");
182
        goto fail;
183
    }
184

    
185
    if (getnameinfo((struct sockaddr *)&clientaddr, addrlen, hbuf, sizeof(hbuf),  sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
186
        perror("getnameinfo");
187
        goto fail;
188
    }
189

    
190
    s->local_port = strtol(sbuf, NULL, 10);
191

    
192
    return udp_fd;
193

    
194
 fail:
195
    if (udp_fd >= 0)
196
        closesocket(udp_fd);
197
    if(res0)
198
        freeaddrinfo(res0);
199
    return -1;
200
}
201

    
202
#endif /* CONFIG_IPV6 */
203

    
204

    
205
/**
206
 * If no filename is given to av_open_input_file because you want to
207
 * get the local port first, then you must call this function to set
208
 * the remote server address.
209
 *
210
 * url syntax: udp://host:port[?option=val...]
211
 * option: 'multicast=1' : enable multicast
212
 *         'ttl=n'       : set the ttl value (for multicast only)
213
 *         'localport=n' : set the local port
214
 *         'pkt_size=n'  : set max packet size
215
 *         'reuse=1'     : enable reusing the socket
216
 *
217
 * @param s1 media file context
218
 * @param uri of the remote server
219
 * @return zero if no error.
220
 */
221
int udp_set_remote_url(URLContext *h, const char *uri)
222
{
223
#ifdef CONFIG_IPV6
224
    return udp_ipv6_set_remote_url(h, uri);
225
#else
226
    UDPContext *s = h->priv_data;
227
    char hostname[256];
228
    int port;
229

    
230
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
231

    
232
    /* set the destination address */
233
    if (resolve_host(&s->dest_addr.sin_addr, hostname) < 0)
234
        return AVERROR(EIO);
235
    s->dest_addr.sin_family = AF_INET;
236
    s->dest_addr.sin_port = htons(port);
237
    s->dest_addr_len = sizeof(s->dest_addr);
238
    return 0;
239
#endif
240
}
241

    
242
/**
243
 * Return the local port used by the UDP connexion
244
 * @param s1 media file context
245
 * @return the local port number
246
 */
247
int udp_get_local_port(URLContext *h)
248
{
249
    UDPContext *s = h->priv_data;
250
    return s->local_port;
251
}
252

    
253
/**
254
 * Return the udp file handle for select() usage to wait for several RTP
255
 * streams at the same time.
256
 * @param h media file context
257
 */
258
int udp_get_file_handle(URLContext *h)
259
{
260
    UDPContext *s = h->priv_data;
261
    return s->udp_fd;
262
}
263

    
264
/* put it in UDP context */
265
/* return non zero if error */
266
static int udp_open(URLContext *h, const char *uri, int flags)
267
{
268
    char hostname[1024];
269
    int port, udp_fd = -1, tmp;
270
    UDPContext *s = NULL;
271
    int is_output;
272
    const char *p;
273
    char buf[256];
274
#ifndef CONFIG_IPV6
275
    struct sockaddr_in my_addr, my_addr1;
276
    int len;
277
#endif
278

    
279
    h->is_streamed = 1;
280
    h->max_packet_size = 1472;
281

    
282
    is_output = (flags & URL_WRONLY);
283

    
284
    s = av_mallocz(sizeof(UDPContext));
285
    if (!s)
286
        return AVERROR(ENOMEM);
287

    
288
    h->priv_data = s;
289
    s->ttl = 16;
290
    s->is_multicast = 0;
291
    s->local_port = 0;
292
    s->reuse_socket = 0;
293
    p = strchr(uri, '?');
294
    if (p) {
295
        s->is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
296
        s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
297
        if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
298
            s->ttl = strtol(buf, NULL, 10);
299
        }
300
        if (find_info_tag(buf, sizeof(buf), "localport", p)) {
301
            s->local_port = strtol(buf, NULL, 10);
302
        }
303
        if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
304
            h->max_packet_size = strtol(buf, NULL, 10);
305
        }
306
    }
307

    
308
    /* fill the dest addr */
309
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
310

    
311
    /* XXX: fix url_split */
312
    if (hostname[0] == '\0' || hostname[0] == '?') {
313
        /* only accepts null hostname if input */
314
        if (s->is_multicast || (flags & URL_WRONLY))
315
            goto fail;
316
    } else {
317
        udp_set_remote_url(h, uri);
318
    }
319

    
320
    if(!ff_network_init())
321
        return AVERROR(EIO);
322

    
323
#ifndef CONFIG_IPV6
324
    udp_fd = socket(AF_INET, SOCK_DGRAM, 0);
325
    if (udp_fd < 0)
326
        goto fail;
327

    
328
    my_addr.sin_family = AF_INET;
329
    my_addr.sin_addr.s_addr = htonl (INADDR_ANY);
330
    if (s->is_multicast && !(h->flags & URL_WRONLY)) {
331
        /* special case: the bind must be done on the multicast address port */
332
        my_addr.sin_port = s->dest_addr.sin_port;
333
    } else {
334
        my_addr.sin_port = htons(s->local_port);
335
    }
336

    
337
    if (s->reuse_socket)
338
        if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
339
            goto fail;
340

    
341
    /* the bind is needed to give a port to the socket now */
342
    if (bind(udp_fd,(struct sockaddr *)&my_addr, sizeof(my_addr)) < 0)
343
        goto fail;
344

    
345
    len = sizeof(my_addr1);
346
    getsockname(udp_fd, (struct sockaddr *)&my_addr1, &len);
347
    s->local_port = ntohs(my_addr1.sin_port);
348

    
349
#ifdef IP_MULTICAST_TTL
350
    if (s->is_multicast) {
351
        if (h->flags & URL_WRONLY) {
352
            /* output */
353
            if (setsockopt(udp_fd, IPPROTO_IP, IP_MULTICAST_TTL,
354
                           &s->ttl, sizeof(s->ttl)) < 0) {
355
                perror("IP_MULTICAST_TTL");
356
                goto fail;
357
            }
358
        } else {
359
            /* input */
360
            memset(&s->mreq, 0, sizeof(s->mreq));
361
            s->mreq.imr_multiaddr = s->dest_addr.sin_addr;
362
            s->mreq.imr_interface.s_addr = htonl (INADDR_ANY);
363
            if (setsockopt(udp_fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
364
                           &s->mreq, sizeof(s->mreq)) < 0) {
365
                perror("rtp: IP_ADD_MEMBERSHIP");
366
                goto fail;
367
            }
368
        }
369
    }
370
#endif
371
#else
372
    if (s->is_multicast && !(h->flags & URL_WRONLY))
373
        s->local_port = port;
374
    udp_fd = udp_ipv6_set_local(h);
375
    if (udp_fd < 0)
376
        goto fail;
377
    if (s->is_multicast) {
378
        if (h->flags & URL_WRONLY) {
379
            if (udp_ipv6_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
380
                goto fail;
381
        } else {
382
            if (udp_ipv6_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
383
                goto fail;
384
        }
385
    }
386
#endif /* CONFIG_IPV6 */
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
#ifndef CONFIG_IPV6
415
    struct sockaddr_in from;
416
#else
417
    struct sockaddr_storage from;
418
#endif
419
    socklen_t from_len;
420
    int len;
421

    
422
    for(;;) {
423
        from_len = sizeof(from);
424
        len = recvfrom (s->udp_fd, buf, size, 0,
425
                        (struct sockaddr *)&from, &from_len);
426
        if (len < 0) {
427
            if (ff_neterrno() != FF_NETERROR(EAGAIN) &&
428
                ff_neterrno() != FF_NETERROR(EINTR))
429
                return AVERROR(EIO);
430
        } else {
431
            break;
432
        }
433
    }
434
    return len;
435
}
436

    
437
static int udp_write(URLContext *h, uint8_t *buf, int size)
438
{
439
    UDPContext *s = h->priv_data;
440
    int ret;
441

    
442
    for(;;) {
443
        ret = sendto (s->udp_fd, buf, size, 0,
444
                      (struct sockaddr *) &s->dest_addr,
445
                      s->dest_addr_len);
446
        if (ret < 0) {
447
            if (ff_neterrno() != FF_NETERROR(EINTR) &&
448
                ff_neterrno() != FF_NETERROR(EAGAIN))
449
                return AVERROR(EIO);
450
        } else {
451
            break;
452
        }
453
    }
454
    return size;
455
}
456

    
457
static int udp_close(URLContext *h)
458
{
459
    UDPContext *s = h->priv_data;
460

    
461
#ifndef CONFIG_IPV6
462
#ifdef IP_DROP_MEMBERSHIP
463
    if (s->is_multicast && !(h->flags & URL_WRONLY)) {
464
        if (setsockopt(s->udp_fd, IPPROTO_IP, IP_DROP_MEMBERSHIP,
465
                       &s->mreq, sizeof(s->mreq)) < 0) {
466
            perror("IP_DROP_MEMBERSHIP");
467
        }
468
    }
469
#endif
470
#else
471
    if (s->is_multicast && !(h->flags & URL_WRONLY))
472
        udp_ipv6_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
473
#endif
474
    closesocket(s->udp_fd);
475
    ff_network_close();
476
    av_free(s);
477
    return 0;
478
}
479

    
480
URLProtocol udp_protocol = {
481
    "udp",
482
    udp_open,
483
    udp_read,
484
    udp_write,
485
    NULL, /* seek */
486
    udp_close,
487
};