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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
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 <sys/types.h>
24
#include <sys/socket.h>
25
#include <netinet/in.h>
26
#ifndef __BEOS__
27
# include <arpa/inet.h>
28
#else
29
# include "barpainet.h"
30
#endif
31
#include <netdb.h>
32

    
33
#ifndef IPV6_ADD_MEMBERSHIP
34
#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
35
#define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
36
#endif
37

    
38
typedef struct {
39
    int udp_fd;
40
    int ttl;
41
    int is_multicast;
42
    int local_port;
43
    int reuse_socket;
44
#ifndef CONFIG_IPV6
45
    struct ip_mreq mreq;
46
    struct sockaddr_in dest_addr;
47
#else
48
    struct sockaddr_storage dest_addr;
49
    size_t dest_addr_len;
50
#endif
51
} UDPContext;
52

    
53
#define UDP_TX_BUF_SIZE 32768
54

    
55
#ifdef CONFIG_IPV6
56

    
57
static int udp_ipv6_is_multicast_address(const struct sockaddr *addr) {
58
    if (addr->sa_family == AF_INET)
59
        return IN_MULTICAST(ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr));
60
    if (addr->sa_family == AF_INET6)
61
        return IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)addr)->sin6_addr);
62
    return -1;
63
}
64

    
65
static int udp_ipv6_set_multicast_ttl(int sockfd, int mcastTTL, struct sockaddr *addr) {
66
    if (addr->sa_family == AF_INET) {
67
        if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
68
            perror("setsockopt(IP_MULTICAST_TTL)");
69
            return -1;
70
        }
71
    }
72
    if (addr->sa_family == AF_INET6) {
73
        if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
74
            perror("setsockopt(IPV6_MULTICAST_HOPS)");
75
            return -1;
76
        }
77
    }
78
    return 0;
79
}
80

    
81
static int udp_ipv6_join_multicast_group(int sockfd, struct sockaddr *addr) {
82
    struct ip_mreq   mreq;
83
    struct ipv6_mreq mreq6;
84
    if (addr->sa_family == AF_INET) {
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
            perror("setsockopt(IP_ADD_MEMBERSHIP)");
89
            return -1;
90
        }
91
    }
92
    if (addr->sa_family == AF_INET6) {
93
        memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
94
        mreq6.ipv6mr_interface= 0;
95
        if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
96
            perror("setsockopt(IPV6_ADD_MEMBERSHIP)");
97
            return -1;
98
        }
99
    }
100
    return 0;
101
}
102

    
103
static int udp_ipv6_leave_multicast_group(int sockfd, struct sockaddr *addr) {
104
    struct ip_mreq   mreq;
105
    struct ipv6_mreq mreq6;
106
    if (addr->sa_family == AF_INET) {
107
        mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
108
        mreq.imr_interface.s_addr= INADDR_ANY;
109
        if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
110
            perror("setsockopt(IP_DROP_MEMBERSHIP)");
111
            return -1;
112
        }
113
    }
114
    if (addr->sa_family == AF_INET6) {
115
        memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
116
        mreq6.ipv6mr_interface= 0;
117
        if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
118
            perror("setsockopt(IPV6_DROP_MEMBERSHIP)");
119
            return -1;
120
        }
121
    }
122
    return 0;
123
}
124

    
125
static struct addrinfo* udp_ipv6_resolve_host(const char *hostname, int port, int type, int family, int flags) {
126
    struct addrinfo hints, *res = 0;
127
    int error;
128
    char sport[16];
129
    const char *node = 0, *service = 0;
130

    
131
    if (port > 0) {
132
        snprintf(sport, sizeof(sport), "%d", port);
133
        service = sport;
134
    }
135
    if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
136
        node = hostname;
137
    }
138
    if ((node) || (service)) {
139
        memset(&hints, 0, sizeof(hints));
140
        hints.ai_socktype = type;
141
        hints.ai_family   = family;
142
        hints.ai_flags = flags;
143
        if ((error = getaddrinfo(node, service, &hints, &res))) {
144
            av_log(NULL, AV_LOG_ERROR, "udp_ipv6_resolve_host: %s\n", gai_strerror(error));
145
        }
146
    }
147
    return res;
148
}
149

    
150
static int udp_ipv6_set_remote_url(URLContext *h, const char *uri) {
151
    UDPContext *s = h->priv_data;
152
    char hostname[256];
153
    int port;
154
    struct addrinfo *res0;
155
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
156
    res0 = udp_ipv6_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
157
    if (res0 == 0) return AVERROR_IO;
158
    memcpy(&s->dest_addr, res0->ai_addr, res0->ai_addrlen);
159
    s->dest_addr_len = res0->ai_addrlen;
160
    freeaddrinfo(res0);
161
    return 0;
162
}
163

    
164
static int udp_ipv6_set_local(URLContext *h) {
165
    UDPContext *s = h->priv_data;
166
    int udp_fd = -1;
167
    struct sockaddr_storage clientaddr;
168
    socklen_t addrlen;
169
    char sbuf[NI_MAXSERV];
170
    char hbuf[NI_MAXHOST];
171
    struct addrinfo *res0 = NULL, *res = NULL;
172

    
173
    if (s->local_port != 0) {
174
        res0 = udp_ipv6_resolve_host(0, s->local_port, SOCK_DGRAM, AF_UNSPEC, AI_PASSIVE);
175
        if (res0 == 0)
176
            goto fail;
177
        for (res = res0; res; res=res->ai_next) {
178
            udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
179
            if (udp_fd > 0) break;
180
            perror("socket");
181
        }
182
    } else {
183
        udp_fd = socket(s->dest_addr.ss_family, SOCK_DGRAM, 0);
184
        if (udp_fd < 0)
185
            perror("socket");
186
    }
187

    
188
    if (udp_fd < 0)
189
        goto fail;
190

    
191
    if (s->local_port != 0) {
192
        if (bind(udp_fd, res0->ai_addr, res0->ai_addrlen) < 0) {
193
            perror("bind");
194
            goto fail;
195
        }
196
        freeaddrinfo(res0);
197
        res0 = NULL;
198
    }
199

    
200
    addrlen = sizeof(clientaddr);
201
    if (getsockname(udp_fd, (struct sockaddr *)&clientaddr, &addrlen) < 0) {
202
        perror("getsockname");
203
        goto fail;
204
    }
205

    
206
    if (getnameinfo((struct sockaddr *)&clientaddr, addrlen, hbuf, sizeof(hbuf),  sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
207
        perror("getnameinfo");
208
        goto fail;
209
    }
210

    
211
    s->local_port = strtol(sbuf, NULL, 10);
212

    
213
    return udp_fd;
214

    
215
 fail:
216
    if (udp_fd >= 0)
217
#ifdef CONFIG_BEOS_NETSERVER
218
        closesocket(udp_fd);
219
#else
220
        close(udp_fd);
221
#endif
222
    if(res0)
223
        freeaddrinfo(res0);
224
    return -1;
225
}
226

    
227
#endif
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: 'multicast=1' : enable multicast
237
 *         'ttl=n'       : set the ttl value (for multicast only)
238
 *         'localport=n' : set the local port
239
 *         'pkt_size=n'  : set max packet size
240
 *         'reuse=1'     : enable reusing the socket
241
 *
242
 * @param s1 media file context
243
 * @param uri of the remote server
244
 * @return zero if no error.
245
 */
246
int udp_set_remote_url(URLContext *h, const char *uri)
247
{
248
#ifdef CONFIG_IPV6
249
    return udp_ipv6_set_remote_url(h, uri);
250
#else
251
    UDPContext *s = h->priv_data;
252
    char hostname[256];
253
    int port;
254

    
255
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
256

    
257
    /* set the destination address */
258
    if (resolve_host(&s->dest_addr.sin_addr, hostname) < 0)
259
        return AVERROR_IO;
260
    s->dest_addr.sin_family = AF_INET;
261
    s->dest_addr.sin_port = htons(port);
262
    return 0;
263
#endif
264
}
265

    
266
/**
267
 * Return the local port used by the UDP connexion
268
 * @param s1 media file context
269
 * @return the local port number
270
 */
271
int udp_get_local_port(URLContext *h)
272
{
273
    UDPContext *s = h->priv_data;
274
    return s->local_port;
275
}
276

    
277
/**
278
 * Return the udp file handle for select() usage to wait for several RTP
279
 * streams at the same time.
280
 * @param h media file context
281
 */
282
int udp_get_file_handle(URLContext *h)
283
{
284
    UDPContext *s = h->priv_data;
285
    return s->udp_fd;
286
}
287

    
288
/* put it in UDP context */
289
/* return non zero if error */
290
static int udp_open(URLContext *h, const char *uri, int flags)
291
{
292
    char hostname[1024];
293
    int port, udp_fd = -1, tmp;
294
    UDPContext *s = NULL;
295
    int is_output;
296
    const char *p;
297
    char buf[256];
298
#ifndef CONFIG_IPV6
299
    struct sockaddr_in my_addr, my_addr1;
300
    int len;
301
#endif
302

    
303
    h->is_streamed = 1;
304
    h->max_packet_size = 1472;
305

    
306
    is_output = (flags & URL_WRONLY);
307

    
308
    s = av_malloc(sizeof(UDPContext));
309
    if (!s)
310
        return -ENOMEM;
311

    
312
    h->priv_data = s;
313
    s->ttl = 16;
314
    s->is_multicast = 0;
315
    s->local_port = 0;
316
    s->reuse_socket = 0;
317
    p = strchr(uri, '?');
318
    if (p) {
319
        s->is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
320
        s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
321
        if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
322
            s->ttl = strtol(buf, NULL, 10);
323
        }
324
        if (find_info_tag(buf, sizeof(buf), "localport", p)) {
325
            s->local_port = strtol(buf, NULL, 10);
326
        }
327
        if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
328
            h->max_packet_size = strtol(buf, NULL, 10);
329
        }
330
    }
331

    
332
    /* fill the dest addr */
333
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
334

    
335
    /* XXX: fix url_split */
336
    if (hostname[0] == '\0' || hostname[0] == '?') {
337
        /* only accepts null hostname if input */
338
        if (s->is_multicast || (flags & URL_WRONLY))
339
            goto fail;
340
    } else {
341
        udp_set_remote_url(h, uri);
342
    }
343

    
344
#ifndef CONFIG_IPV6
345
    udp_fd = socket(PF_INET, SOCK_DGRAM, 0);
346
    if (udp_fd < 0)
347
        goto fail;
348

    
349
    my_addr.sin_family = AF_INET;
350
    my_addr.sin_addr.s_addr = htonl (INADDR_ANY);
351
    if (s->is_multicast && !(h->flags & URL_WRONLY)) {
352
        /* special case: the bind must be done on the multicast address port */
353
        my_addr.sin_port = s->dest_addr.sin_port;
354
    } else {
355
        my_addr.sin_port = htons(s->local_port);
356
    }
357

    
358
    if (s->reuse_socket)
359
        if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
360
            goto fail;
361

    
362
    /* the bind is needed to give a port to the socket now */
363
    if (bind(udp_fd,(struct sockaddr *)&my_addr, sizeof(my_addr)) < 0)
364
        goto fail;
365

    
366
    len = sizeof(my_addr1);
367
    getsockname(udp_fd, (struct sockaddr *)&my_addr1, &len);
368
    s->local_port = ntohs(my_addr1.sin_port);
369

    
370
#ifndef CONFIG_BEOS_NETSERVER
371
    if (s->is_multicast) {
372
        if (h->flags & URL_WRONLY) {
373
            /* output */
374
            if (setsockopt(udp_fd, IPPROTO_IP, IP_MULTICAST_TTL,
375
                           &s->ttl, sizeof(s->ttl)) < 0) {
376
                perror("IP_MULTICAST_TTL");
377
                goto fail;
378
            }
379
        } else {
380
            /* input */
381
            memset(&s->mreq, 0, sizeof(s->mreq));
382
            s->mreq.imr_multiaddr = s->dest_addr.sin_addr;
383
            s->mreq.imr_interface.s_addr = htonl (INADDR_ANY);
384
            if (setsockopt(udp_fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
385
                           &s->mreq, sizeof(s->mreq)) < 0) {
386
                perror("rtp: IP_ADD_MEMBERSHIP");
387
                goto fail;
388
            }
389
        }
390
    }
391
#endif
392
#else
393
    if (s->is_multicast && !(h->flags & URL_WRONLY))
394
        s->local_port = port;
395
    udp_fd = udp_ipv6_set_local(h);
396
    if (udp_fd < 0)
397
        goto fail;
398
#ifndef CONFIG_BEOS_NETSERVER
399
    if (s->is_multicast) {
400
        if (h->flags & URL_WRONLY) {
401
            if (udp_ipv6_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
402
                goto fail;
403
        } else {
404
            if (udp_ipv6_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
405
                goto fail;
406
        }
407
    }
408
#endif
409
#endif
410

    
411
    if (is_output) {
412
        /* limit the tx buf size to limit latency */
413
        tmp = UDP_TX_BUF_SIZE;
414
        if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
415
            perror("setsockopt sndbuf");
416
            goto fail;
417
        }
418
    }
419

    
420
    s->udp_fd = udp_fd;
421
    return 0;
422
 fail:
423
    if (udp_fd >= 0)
424
#ifdef CONFIG_BEOS_NETSERVER
425
        closesocket(udp_fd);
426
#else
427
        close(udp_fd);
428
#endif
429
    av_free(s);
430
    return AVERROR_IO;
431
}
432

    
433
static int udp_read(URLContext *h, uint8_t *buf, int size)
434
{
435
    UDPContext *s = h->priv_data;
436
#ifndef CONFIG_IPV6
437
    struct sockaddr_in from;
438
#else
439
    struct sockaddr_storage from;
440
#endif
441
    socklen_t from_len;
442
    int len;
443

    
444
    for(;;) {
445
        from_len = sizeof(from);
446
        len = recvfrom (s->udp_fd, buf, size, 0,
447
                        (struct sockaddr *)&from, &from_len);
448
        if (len < 0) {
449
            if (errno != EAGAIN && errno != EINTR)
450
                return AVERROR_IO;
451
        } else {
452
            break;
453
        }
454
    }
455
    return len;
456
}
457

    
458
static int udp_write(URLContext *h, uint8_t *buf, int size)
459
{
460
    UDPContext *s = h->priv_data;
461
    int ret;
462

    
463
    for(;;) {
464
        ret = sendto (s->udp_fd, buf, size, 0,
465
                      (struct sockaddr *) &s->dest_addr,
466
#ifndef CONFIG_IPV6
467
                      sizeof (s->dest_addr));
468
#else
469
                      s->dest_addr_len);
470
#endif
471
        if (ret < 0) {
472
            if (errno != EINTR && errno != EAGAIN)
473
                return AVERROR_IO;
474
        } else {
475
            break;
476
        }
477
    }
478
    return size;
479
}
480

    
481
static int udp_close(URLContext *h)
482
{
483
    UDPContext *s = h->priv_data;
484

    
485
#ifndef CONFIG_BEOS_NETSERVER
486
#ifndef CONFIG_IPV6
487
    if (s->is_multicast && !(h->flags & URL_WRONLY)) {
488
        if (setsockopt(s->udp_fd, IPPROTO_IP, IP_DROP_MEMBERSHIP,
489
                       &s->mreq, sizeof(s->mreq)) < 0) {
490
            perror("IP_DROP_MEMBERSHIP");
491
        }
492
    }
493
#else
494
    if (s->is_multicast && !(h->flags & URL_WRONLY))
495
        udp_ipv6_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
496
#endif
497
    close(s->udp_fd);
498
#else
499
    closesocket(s->udp_fd);
500
#endif
501
    av_free(s);
502
    return 0;
503
}
504

    
505
URLProtocol udp_protocol = {
506
    "udp",
507
    udp_open,
508
    udp_read,
509
    udp_write,
510
    NULL, /* seek */
511
    udp_close,
512
};