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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
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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
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
    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_is_multicast_address(const struct sockaddr *addr) {
50
    if (addr->sa_family == AF_INET)
51
        return IN_MULTICAST(ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr));
52
    if (addr->sa_family == AF_INET6)
53
        return IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)addr)->sin6_addr);
54
    return -1;
55
}
56

    
57
static int udp_ipv6_set_multicast_ttl(int sockfd, int mcastTTL, struct sockaddr *addr) {
58
    if (addr->sa_family == AF_INET) {
59
        if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
60
            perror("setsockopt(IP_MULTICAST_TTL)");
61
            return -1;
62
        }
63
    }
64
    if (addr->sa_family == AF_INET6) {
65
        if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
66
            perror("setsockopt(IPV6_MULTICAST_HOPS)");
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            return -1;
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        }
69
    }
70
    return 0;
71
}
72

    
73
static int udp_ipv6_join_multicast_group(int sockfd, struct sockaddr *addr) {
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    struct ip_mreq   mreq;
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    struct ipv6_mreq mreq6;
76
    if (addr->sa_family == AF_INET) {
77
        mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
78
        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) {
80
            perror("setsockopt(IP_ADD_MEMBERSHIP)");
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            return -1;
82
        }
83
    }
84
    if (addr->sa_family == AF_INET6) {
85
        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) {
88
            perror("setsockopt(IPV6_ADD_MEMBERSHIP)");
89
            return -1;
90
        }
91
    }
92
    return 0;
93
}
94

    
95
static int udp_ipv6_leave_multicast_group(int sockfd, struct sockaddr *addr) {
96
    struct ip_mreq   mreq;
97
    struct ipv6_mreq mreq6;
98
    if (addr->sa_family == AF_INET) {
99
        mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
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        mreq.imr_interface.s_addr= INADDR_ANY;
101
        if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
102
            perror("setsockopt(IP_DROP_MEMBERSHIP)");
103
            return -1;
104
        }
105
    }
106
    if (addr->sa_family == AF_INET6) {
107
        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) {
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            perror("setsockopt(IPV6_DROP_MEMBERSHIP)");
111
            return -1;
112
        }
113
    }
114
    return 0;
115
}
116

    
117
static struct addrinfo* udp_ipv6_resolve_host(const char *hostname, int port, int type, int family, int flags) {
118
    struct addrinfo hints, *res = 0;
119
    int error;
120
    char sport[16];
121
    const char *node = 0, *service = 0;
122

    
123
    if (port > 0) {
124
        snprintf(sport, sizeof(sport), "%d", port);
125
        service = sport;
126
    }
127
    if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
128
        node = hostname;
129
    }
130
    if ((node) || (service)) {
131
        memset(&hints, 0, sizeof(hints));
132
        hints.ai_socktype = type;
133
        hints.ai_family   = family;
134
        hints.ai_flags = flags;
135
        if ((error = getaddrinfo(node, service, &hints, &res))) {
136
            av_log(NULL, AV_LOG_ERROR, "udp_ipv6_resolve_host: %s\n", gai_strerror(error));
137
        }
138
    }
139
    return res;
140
}
141

    
142
static int udp_ipv6_set_remote_url(URLContext *h, const char *uri) {
143
    UDPContext *s = h->priv_data;
144
    char hostname[256];
145
    int port;
146
    struct addrinfo *res0;
147
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
148
    res0 = udp_ipv6_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
149
    if (res0 == 0) return AVERROR_IO;
150
    memcpy(&s->dest_addr, res0->ai_addr, res0->ai_addrlen);
151
    s->dest_addr_len = res0->ai_addrlen;
152
    freeaddrinfo(res0);
153
    return 0;
154
}
155

    
156
static int udp_ipv6_set_local(URLContext *h) {
157
    UDPContext *s = h->priv_data;
158
    int udp_fd = -1;
159
    struct sockaddr_storage clientaddr;
160
    socklen_t addrlen;
161
    char sbuf[NI_MAXSERV];
162
    char hbuf[NI_MAXHOST];
163
    struct addrinfo *res0 = NULL, *res = NULL;
164

    
165
    if (s->local_port != 0) {
166
        res0 = udp_ipv6_resolve_host(0, s->local_port, SOCK_DGRAM, AF_UNSPEC, AI_PASSIVE);
167
        if (res0 == 0)
168
            goto fail;
169
        for (res = res0; res; res=res->ai_next) {
170
            udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
171
            if (udp_fd > 0) break;
172
            perror("socket");
173
        }
174
    } else {
175
        udp_fd = socket(s->dest_addr.ss_family, SOCK_DGRAM, 0);
176
        if (udp_fd < 0)
177
            perror("socket");
178
    }
179

    
180
    if (udp_fd < 0)
181
        goto fail;
182

    
183
    if (s->local_port != 0) {
184
        if (bind(udp_fd, res0->ai_addr, res0->ai_addrlen) < 0) {
185
            perror("bind");
186
            goto fail;
187
        }
188
        freeaddrinfo(res0);
189
        res0 = NULL;
190
    }
191

    
192
    addrlen = sizeof(clientaddr);
193
    if (getsockname(udp_fd, (struct sockaddr *)&clientaddr, &addrlen) < 0) {
194
        perror("getsockname");
195
        goto fail;
196
    }
197

    
198
    if (getnameinfo((struct sockaddr *)&clientaddr, addrlen, hbuf, sizeof(hbuf),  sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
199
        perror("getnameinfo");
200
        goto fail;
201
    }
202

    
203
    s->local_port = strtol(sbuf, NULL, 10);
204

    
205
    return udp_fd;
206

    
207
 fail:
208
    if (udp_fd >= 0)
209
        closesocket(udp_fd);
210
    if(res0)
211
        freeaddrinfo(res0);
212
    return -1;
213
}
214

    
215
#endif
216

    
217

    
218
/**
219
 * If no filename is given to av_open_input_file because you want to
220
 * get the local port first, then you must call this function to set
221
 * the remote server address.
222
 *
223
 * url syntax: udp://host:port[?option=val...]
224
 * option: 'multicast=1' : enable multicast
225
 *         'ttl=n'       : set the ttl value (for multicast only)
226
 *         'localport=n' : set the local port
227
 *         'pkt_size=n'  : set max packet size
228
 *         'reuse=1'     : enable reusing the socket
229
 *
230
 * @param s1 media file context
231
 * @param uri of the remote server
232
 * @return zero if no error.
233
 */
234
int udp_set_remote_url(URLContext *h, const char *uri)
235
{
236
#ifdef CONFIG_IPV6
237
    return udp_ipv6_set_remote_url(h, uri);
238
#else
239
    UDPContext *s = h->priv_data;
240
    char hostname[256];
241
    int port;
242

    
243
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
244

    
245
    /* set the destination address */
246
    if (resolve_host(&s->dest_addr.sin_addr, hostname) < 0)
247
        return AVERROR_IO;
248
    s->dest_addr.sin_family = AF_INET;
249
    s->dest_addr.sin_port = htons(port);
250
    return 0;
251
#endif
252
}
253

    
254
/**
255
 * Return the local port used by the UDP connexion
256
 * @param s1 media file context
257
 * @return the local port number
258
 */
259
int udp_get_local_port(URLContext *h)
260
{
261
    UDPContext *s = h->priv_data;
262
    return s->local_port;
263
}
264

    
265
/**
266
 * Return the udp file handle for select() usage to wait for several RTP
267
 * streams at the same time.
268
 * @param h media file context
269
 */
270
int udp_get_file_handle(URLContext *h)
271
{
272
    UDPContext *s = h->priv_data;
273
    return s->udp_fd;
274
}
275

    
276
/* put it in UDP context */
277
/* return non zero if error */
278
static int udp_open(URLContext *h, const char *uri, int flags)
279
{
280
    char hostname[1024];
281
    int port, udp_fd = -1, tmp;
282
    UDPContext *s = NULL;
283
    int is_output;
284
    const char *p;
285
    char buf[256];
286
#ifndef CONFIG_IPV6
287
    struct sockaddr_in my_addr, my_addr1;
288
    int len;
289
#endif
290

    
291
    h->is_streamed = 1;
292
    h->max_packet_size = 1472;
293

    
294
    is_output = (flags & URL_WRONLY);
295

    
296
    s = av_malloc(sizeof(UDPContext));
297
    if (!s)
298
        return AVERROR(ENOMEM);
299

    
300
    h->priv_data = s;
301
    s->ttl = 16;
302
    s->is_multicast = 0;
303
    s->local_port = 0;
304
    s->reuse_socket = 0;
305
    p = strchr(uri, '?');
306
    if (p) {
307
        s->is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
308
        s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
309
        if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
310
            s->ttl = strtol(buf, NULL, 10);
311
        }
312
        if (find_info_tag(buf, sizeof(buf), "localport", p)) {
313
            s->local_port = strtol(buf, NULL, 10);
314
        }
315
        if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
316
            h->max_packet_size = strtol(buf, NULL, 10);
317
        }
318
    }
319

    
320
    /* fill the dest addr */
321
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
322

    
323
    /* XXX: fix url_split */
324
    if (hostname[0] == '\0' || hostname[0] == '?') {
325
        /* only accepts null hostname if input */
326
        if (s->is_multicast || (flags & URL_WRONLY))
327
            goto fail;
328
    } else {
329
        udp_set_remote_url(h, uri);
330
    }
331

    
332
#ifndef CONFIG_IPV6
333
    udp_fd = socket(AF_INET, SOCK_DGRAM, 0);
334
    if (udp_fd < 0)
335
        goto fail;
336

    
337
    my_addr.sin_family = AF_INET;
338
    my_addr.sin_addr.s_addr = htonl (INADDR_ANY);
339
    if (s->is_multicast && !(h->flags & URL_WRONLY)) {
340
        /* special case: the bind must be done on the multicast address port */
341
        my_addr.sin_port = s->dest_addr.sin_port;
342
    } else {
343
        my_addr.sin_port = htons(s->local_port);
344
    }
345

    
346
    if (s->reuse_socket)
347
        if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
348
            goto fail;
349

    
350
    /* the bind is needed to give a port to the socket now */
351
    if (bind(udp_fd,(struct sockaddr *)&my_addr, sizeof(my_addr)) < 0)
352
        goto fail;
353

    
354
    len = sizeof(my_addr1);
355
    getsockname(udp_fd, (struct sockaddr *)&my_addr1, &len);
356
    s->local_port = ntohs(my_addr1.sin_port);
357

    
358
#ifdef IP_MULTICAST_TTL
359
    if (s->is_multicast) {
360
        if (h->flags & URL_WRONLY) {
361
            /* output */
362
            if (setsockopt(udp_fd, IPPROTO_IP, IP_MULTICAST_TTL,
363
                           &s->ttl, sizeof(s->ttl)) < 0) {
364
                perror("IP_MULTICAST_TTL");
365
                goto fail;
366
            }
367
        } else {
368
            /* input */
369
            memset(&s->mreq, 0, sizeof(s->mreq));
370
            s->mreq.imr_multiaddr = s->dest_addr.sin_addr;
371
            s->mreq.imr_interface.s_addr = htonl (INADDR_ANY);
372
            if (setsockopt(udp_fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
373
                           &s->mreq, sizeof(s->mreq)) < 0) {
374
                perror("rtp: IP_ADD_MEMBERSHIP");
375
                goto fail;
376
            }
377
        }
378
    }
379
#endif
380
#else
381
    if (s->is_multicast && !(h->flags & URL_WRONLY))
382
        s->local_port = port;
383
    udp_fd = udp_ipv6_set_local(h);
384
    if (udp_fd < 0)
385
        goto fail;
386
    if (s->is_multicast) {
387
        if (h->flags & URL_WRONLY) {
388
            if (udp_ipv6_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
389
                goto fail;
390
        } else {
391
            if (udp_ipv6_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
392
                goto fail;
393
        }
394
    }
395
#endif
396

    
397
    if (is_output) {
398
        /* limit the tx buf size to limit latency */
399
        tmp = UDP_TX_BUF_SIZE;
400
        if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
401
            perror("setsockopt sndbuf");
402
            goto fail;
403
        }
404
    }
405

    
406
    s->udp_fd = udp_fd;
407
    return 0;
408
 fail:
409
    if (udp_fd >= 0)
410
        closesocket(udp_fd);
411
    av_free(s);
412
    return AVERROR_IO;
413
}
414

    
415
static int udp_read(URLContext *h, uint8_t *buf, int size)
416
{
417
    UDPContext *s = h->priv_data;
418
#ifndef CONFIG_IPV6
419
    struct sockaddr_in from;
420
#else
421
    struct sockaddr_storage from;
422
#endif
423
    socklen_t from_len;
424
    int len;
425

    
426
    for(;;) {
427
        from_len = sizeof(from);
428
        len = recvfrom (s->udp_fd, buf, size, 0,
429
                        (struct sockaddr *)&from, &from_len);
430
        if (len < 0) {
431
            if (errno != EAGAIN && errno != EINTR)
432
                return AVERROR_IO;
433
        } else {
434
            break;
435
        }
436
    }
437
    return len;
438
}
439

    
440
static int udp_write(URLContext *h, uint8_t *buf, int size)
441
{
442
    UDPContext *s = h->priv_data;
443
    int ret;
444

    
445
    for(;;) {
446
        ret = sendto (s->udp_fd, buf, size, 0,
447
                      (struct sockaddr *) &s->dest_addr,
448
#ifndef CONFIG_IPV6
449
                      sizeof (s->dest_addr));
450
#else
451
                      s->dest_addr_len);
452
#endif
453
        if (ret < 0) {
454
            if (errno != EINTR && errno != EAGAIN)
455
                return AVERROR_IO;
456
        } else {
457
            break;
458
        }
459
    }
460
    return size;
461
}
462

    
463
static int udp_close(URLContext *h)
464
{
465
    UDPContext *s = h->priv_data;
466

    
467
#ifndef CONFIG_IPV6
468
#ifdef IP_DROP_MEMBERSHIP
469
    if (s->is_multicast && !(h->flags & URL_WRONLY)) {
470
        if (setsockopt(s->udp_fd, IPPROTO_IP, IP_DROP_MEMBERSHIP,
471
                       &s->mreq, sizeof(s->mreq)) < 0) {
472
            perror("IP_DROP_MEMBERSHIP");
473
        }
474
    }
475
#endif
476
#else
477
    if (s->is_multicast && !(h->flags & URL_WRONLY))
478
        udp_ipv6_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
479
#endif
480
    closesocket(s->udp_fd);
481
    av_free(s);
482
    return 0;
483
}
484

    
485
URLProtocol udp_protocol = {
486
    "udp",
487
    udp_open,
488
    udp_read,
489
    udp_write,
490
    NULL, /* seek */
491
    udp_close,
492
};