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ffmpeg / libavformat / udp.c @ d2062ff6

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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
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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
    size_t dest_addr_len;
42
#endif
43
} UDPContext;
44

    
45
#define UDP_TX_BUF_SIZE 32768
46

    
47
#ifdef CONFIG_IPV6
48

    
49
static int udp_ipv6_set_multicast_ttl(int sockfd, int mcastTTL, struct sockaddr *addr) {
50
    if (addr->sa_family == AF_INET) {
51
        if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
52
            perror("setsockopt(IP_MULTICAST_TTL)");
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            return -1;
54
        }
55
    }
56
    if (addr->sa_family == AF_INET6) {
57
        if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
58
            perror("setsockopt(IPV6_MULTICAST_HOPS)");
59
            return -1;
60
        }
61
    }
62
    return 0;
63
}
64

    
65
static int udp_ipv6_join_multicast_group(int sockfd, struct sockaddr *addr) {
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    struct ip_mreq   mreq;
67
    struct ipv6_mreq mreq6;
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    if (addr->sa_family == AF_INET) {
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        mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
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        mreq.imr_interface.s_addr= INADDR_ANY;
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        if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
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            perror("setsockopt(IP_ADD_MEMBERSHIP)");
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            return -1;
74
        }
75
    }
76
    if (addr->sa_family == AF_INET6) {
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        memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
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        mreq6.ipv6mr_interface= 0;
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        if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
80
            perror("setsockopt(IPV6_ADD_MEMBERSHIP)");
81
            return -1;
82
        }
83
    }
84
    return 0;
85
}
86

    
87
static int udp_ipv6_leave_multicast_group(int sockfd, struct sockaddr *addr) {
88
    struct ip_mreq   mreq;
89
    struct ipv6_mreq mreq6;
90
    if (addr->sa_family == AF_INET) {
91
        mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
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        mreq.imr_interface.s_addr= INADDR_ANY;
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        if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
94
            perror("setsockopt(IP_DROP_MEMBERSHIP)");
95
            return -1;
96
        }
97
    }
98
    if (addr->sa_family == AF_INET6) {
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        memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
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        mreq6.ipv6mr_interface= 0;
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        if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
102
            perror("setsockopt(IPV6_DROP_MEMBERSHIP)");
103
            return -1;
104
        }
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    }
106
    return 0;
107
}
108

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

    
115
    if (port > 0) {
116
        snprintf(sport, sizeof(sport), "%d", port);
117
        service = sport;
118
    }
119
    if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
120
        node = hostname;
121
    }
122
    if ((node) || (service)) {
123
        memset(&hints, 0, sizeof(hints));
124
        hints.ai_socktype = type;
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        hints.ai_family   = family;
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        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

    
157
    if (s->local_port != 0) {
158
        res0 = udp_ipv6_resolve_host(0, s->local_port, SOCK_DGRAM, AF_UNSPEC, AI_PASSIVE);
159
        if (res0 == 0)
160
            goto fail;
161
        for (res = res0; res; res=res->ai_next) {
162
            udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
163
            if (udp_fd > 0) break;
164
            perror("socket");
165
        }
166
    } else {
167
        udp_fd = socket(s->dest_addr.ss_family, SOCK_DGRAM, 0);
168
        if (udp_fd < 0)
169
            perror("socket");
170
    }
171

    
172
    if (udp_fd < 0)
173
        goto fail;
174

    
175
    if (s->local_port != 0) {
176
        if (bind(udp_fd, res0->ai_addr, res0->ai_addrlen) < 0) {
177
            perror("bind");
178
            goto fail;
179
        }
180
        freeaddrinfo(res0);
181
        res0 = NULL;
182
    }
183

    
184
    addrlen = sizeof(clientaddr);
185
    if (getsockname(udp_fd, (struct sockaddr *)&clientaddr, &addrlen) < 0) {
186
        perror("getsockname");
187
        goto fail;
188
    }
189

    
190
    if (getnameinfo((struct sockaddr *)&clientaddr, addrlen, hbuf, sizeof(hbuf),  sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
191
        perror("getnameinfo");
192
        goto fail;
193
    }
194

    
195
    s->local_port = strtol(sbuf, NULL, 10);
196

    
197
    return udp_fd;
198

    
199
 fail:
200
    if (udp_fd >= 0)
201
        closesocket(udp_fd);
202
    if(res0)
203
        freeaddrinfo(res0);
204
    return -1;
205
}
206

    
207
#endif /* CONFIG_IPV6 */
208

    
209

    
210
/**
211
 * If no filename is given to av_open_input_file because you want to
212
 * get the local port first, then you must call this function to set
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 * the remote server address.
214
 *
215
 * url syntax: udp://host:port[?option=val...]
216
 * option: 'multicast=1' : enable multicast
217
 *         'ttl=n'       : set the ttl value (for multicast only)
218
 *         'localport=n' : set the local port
219
 *         'pkt_size=n'  : set max packet size
220
 *         'reuse=1'     : enable reusing the socket
221
 *
222
 * @param s1 media file context
223
 * @param uri of the remote server
224
 * @return zero if no error.
225
 */
226
int udp_set_remote_url(URLContext *h, const char *uri)
227
{
228
#ifdef CONFIG_IPV6
229
    return udp_ipv6_set_remote_url(h, uri);
230
#else
231
    UDPContext *s = h->priv_data;
232
    char hostname[256];
233
    int port;
234

    
235
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
236

    
237
    /* set the destination address */
238
    if (resolve_host(&s->dest_addr.sin_addr, hostname) < 0)
239
        return AVERROR(EIO);
240
    s->dest_addr.sin_family = AF_INET;
241
    s->dest_addr.sin_port = htons(port);
242
    return 0;
243
#endif
244
}
245

    
246
/**
247
 * Return the local port used by the UDP connexion
248
 * @param s1 media file context
249
 * @return the local port number
250
 */
251
int udp_get_local_port(URLContext *h)
252
{
253
    UDPContext *s = h->priv_data;
254
    return s->local_port;
255
}
256

    
257
/**
258
 * Return the udp file handle for select() usage to wait for several RTP
259
 * streams at the same time.
260
 * @param h media file context
261
 */
262
int udp_get_file_handle(URLContext *h)
263
{
264
    UDPContext *s = h->priv_data;
265
    return s->udp_fd;
266
}
267

    
268
/* put it in UDP context */
269
/* return non zero if error */
270
static int udp_open(URLContext *h, const char *uri, int flags)
271
{
272
    char hostname[1024];
273
    int port, udp_fd = -1, tmp;
274
    UDPContext *s = NULL;
275
    int is_output;
276
    const char *p;
277
    char buf[256];
278
#ifndef CONFIG_IPV6
279
    struct sockaddr_in my_addr, my_addr1;
280
    int len;
281
#endif
282

    
283
    h->is_streamed = 1;
284
    h->max_packet_size = 1472;
285

    
286
    is_output = (flags & URL_WRONLY);
287

    
288
    s = av_malloc(sizeof(UDPContext));
289
    if (!s)
290
        return AVERROR(ENOMEM);
291

    
292
    h->priv_data = s;
293
    s->ttl = 16;
294
    s->is_multicast = 0;
295
    s->local_port = 0;
296
    s->reuse_socket = 0;
297
    p = strchr(uri, '?');
298
    if (p) {
299
        s->is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
300
        s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
301
        if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
302
            s->ttl = strtol(buf, NULL, 10);
303
        }
304
        if (find_info_tag(buf, sizeof(buf), "localport", p)) {
305
            s->local_port = strtol(buf, NULL, 10);
306
        }
307
        if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
308
            h->max_packet_size = strtol(buf, NULL, 10);
309
        }
310
    }
311

    
312
    /* fill the dest addr */
313
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
314

    
315
    /* XXX: fix url_split */
316
    if (hostname[0] == '\0' || hostname[0] == '?') {
317
        /* only accepts null hostname if input */
318
        if (s->is_multicast || (flags & URL_WRONLY))
319
            goto fail;
320
    } else {
321
        udp_set_remote_url(h, uri);
322
    }
323

    
324
    if(!ff_network_init())
325
        return AVERROR(EIO);
326

    
327
#ifndef CONFIG_IPV6
328
    udp_fd = socket(AF_INET, SOCK_DGRAM, 0);
329
    if (udp_fd < 0)
330
        goto fail;
331

    
332
    my_addr.sin_family = AF_INET;
333
    my_addr.sin_addr.s_addr = htonl (INADDR_ANY);
334
    if (s->is_multicast && !(h->flags & URL_WRONLY)) {
335
        /* special case: the bind must be done on the multicast address port */
336
        my_addr.sin_port = s->dest_addr.sin_port;
337
    } else {
338
        my_addr.sin_port = htons(s->local_port);
339
    }
340

    
341
    if (s->reuse_socket)
342
        if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
343
            goto fail;
344

    
345
    /* the bind is needed to give a port to the socket now */
346
    if (bind(udp_fd,(struct sockaddr *)&my_addr, sizeof(my_addr)) < 0)
347
        goto fail;
348

    
349
    len = sizeof(my_addr1);
350
    getsockname(udp_fd, (struct sockaddr *)&my_addr1, &len);
351
    s->local_port = ntohs(my_addr1.sin_port);
352

    
353
#ifdef IP_MULTICAST_TTL
354
    if (s->is_multicast) {
355
        if (h->flags & URL_WRONLY) {
356
            /* output */
357
            if (setsockopt(udp_fd, IPPROTO_IP, IP_MULTICAST_TTL,
358
                           &s->ttl, sizeof(s->ttl)) < 0) {
359
                perror("IP_MULTICAST_TTL");
360
                goto fail;
361
            }
362
        } else {
363
            /* input */
364
            memset(&s->mreq, 0, sizeof(s->mreq));
365
            s->mreq.imr_multiaddr = s->dest_addr.sin_addr;
366
            s->mreq.imr_interface.s_addr = htonl (INADDR_ANY);
367
            if (setsockopt(udp_fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
368
                           &s->mreq, sizeof(s->mreq)) < 0) {
369
                perror("rtp: IP_ADD_MEMBERSHIP");
370
                goto fail;
371
            }
372
        }
373
    }
374
#endif
375
#else
376
    if (s->is_multicast && !(h->flags & URL_WRONLY))
377
        s->local_port = port;
378
    udp_fd = udp_ipv6_set_local(h);
379
    if (udp_fd < 0)
380
        goto fail;
381
    if (s->is_multicast) {
382
        if (h->flags & URL_WRONLY) {
383
            if (udp_ipv6_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
384
                goto fail;
385
        } else {
386
            if (udp_ipv6_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
387
                goto fail;
388
        }
389
    }
390
#endif /* CONFIG_IPV6 */
391

    
392
    if (is_output) {
393
        /* limit the tx buf size to limit latency */
394
        tmp = UDP_TX_BUF_SIZE;
395
        if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
396
            perror("setsockopt sndbuf");
397
            goto fail;
398
        }
399
    }
400

    
401
    s->udp_fd = udp_fd;
402
    return 0;
403
 fail:
404
    if (udp_fd >= 0)
405
        closesocket(udp_fd);
406
    av_free(s);
407
    return AVERROR(EIO);
408
}
409

    
410
static int udp_read(URLContext *h, uint8_t *buf, int size)
411
{
412
    UDPContext *s = h->priv_data;
413
#ifndef CONFIG_IPV6
414
    struct sockaddr_in from;
415
#else
416
    struct sockaddr_storage from;
417
#endif
418
    socklen_t from_len;
419
    int len;
420

    
421
    for(;;) {
422
        from_len = sizeof(from);
423
        len = recvfrom (s->udp_fd, buf, size, 0,
424
                        (struct sockaddr *)&from, &from_len);
425
        if (len < 0) {
426
            if (ff_neterrno() != FF_NETERROR(EAGAIN) &&
427
                ff_neterrno() != FF_NETERROR(EINTR))
428
                return AVERROR(EIO);
429
        } else {
430
            break;
431
        }
432
    }
433
    return len;
434
}
435

    
436
static int udp_write(URLContext *h, uint8_t *buf, int size)
437
{
438
    UDPContext *s = h->priv_data;
439
    int ret;
440

    
441
    for(;;) {
442
        ret = sendto (s->udp_fd, buf, size, 0,
443
                      (struct sockaddr *) &s->dest_addr,
444
#ifndef CONFIG_IPV6
445
                      sizeof (s->dest_addr));
446
#else
447
                      s->dest_addr_len);
448
#endif
449
        if (ret < 0) {
450
            if (ff_neterrno() != FF_NETERROR(EINTR) &&
451
                ff_neterrno() != FF_NETERROR(EAGAIN))
452
                return AVERROR(EIO);
453
        } else {
454
            break;
455
        }
456
    }
457
    return size;
458
}
459

    
460
static int udp_close(URLContext *h)
461
{
462
    UDPContext *s = h->priv_data;
463

    
464
#ifndef CONFIG_IPV6
465
#ifdef IP_DROP_MEMBERSHIP
466
    if (s->is_multicast && !(h->flags & URL_WRONLY)) {
467
        if (setsockopt(s->udp_fd, IPPROTO_IP, IP_DROP_MEMBERSHIP,
468
                       &s->mreq, sizeof(s->mreq)) < 0) {
469
            perror("IP_DROP_MEMBERSHIP");
470
        }
471
    }
472
#endif
473
#else
474
    if (s->is_multicast && !(h->flags & URL_WRONLY))
475
        udp_ipv6_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
476
#endif
477
    closesocket(s->udp_fd);
478
    ff_network_close();
479
    av_free(s);
480
    return 0;
481
}
482

    
483
URLProtocol udp_protocol = {
484
    "udp",
485
    udp_open,
486
    udp_read,
487
    udp_write,
488
    NULL, /* seek */
489
    udp_close,
490
};