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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
 *
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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
20
 */
21

    
22
/**
23
 * @file udp.c
24
 * UDP protocol
25
 */
26

    
27
#include "avformat.h"
28
#include <unistd.h>
29
#include "network.h"
30
#include "os_support.h"
31

    
32
#ifndef IPV6_ADD_MEMBERSHIP
33
#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
34
#define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
35
#endif
36
#ifndef IN_MULTICAST
37
#define IN_MULTICAST(a) ((((uint32_t)(a)) & 0xf0000000) == 0xe0000000)
38
#endif
39
#ifndef IN6_IS_ADDR_MULTICAST
40
#define IN6_IS_ADDR_MULTICAST(a) (((uint8_t *) (a))[0] == 0xff)
41
#endif
42

    
43
typedef struct {
44
    int udp_fd;
45
    int ttl;
46
    int is_multicast;
47
    int local_port;
48
    int reuse_socket;
49
#ifndef CONFIG_IPV6
50
    struct sockaddr_in dest_addr;
51
#else
52
    struct sockaddr_storage dest_addr;
53
#endif
54
    size_t dest_addr_len;
55
} UDPContext;
56

    
57
#define UDP_TX_BUF_SIZE 32768
58
#define UDP_MAX_PKT_SIZE 65536
59

    
60
static int udp_set_multicast_ttl(int sockfd, int mcastTTL, struct sockaddr *addr) {
61
#ifdef IP_MULTICAST_TTL
62
    if (addr->sa_family == AF_INET) {
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        if (setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_TTL, &mcastTTL, sizeof(mcastTTL)) < 0) {
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            av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_MULTICAST_TTL): %s\n", strerror(errno));
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            return -1;
66
        }
67
    }
68
#endif
69
#ifdef CONFIG_IPV6
70
    if (addr->sa_family == AF_INET6) {
71
        if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
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            av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_MULTICAST_HOPS): %s\n", strerror(errno));
73
            return -1;
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        }
75
    }
76
#endif
77
    return 0;
78
}
79

    
80
static int udp_join_multicast_group(int sockfd, struct sockaddr *addr) {
81
#ifdef IP_ADD_MEMBERSHIP
82
    if (addr->sa_family == AF_INET) {
83
        struct ip_mreq mreq;
84

    
85
        mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
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        mreq.imr_interface.s_addr= INADDR_ANY;
87
        if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
88
            av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP): %s\n", strerror(errno));
89
            return -1;
90
        }
91
    }
92
#endif
93
#ifdef CONFIG_IPV6
94
    if (addr->sa_family == AF_INET6) {
95
        struct ipv6_mreq mreq6;
96

    
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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) {
100
            av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP): %s\n", strerror(errno));
101
            return -1;
102
        }
103
    }
104
#endif
105
    return 0;
106
}
107

    
108
static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr) {
109
#ifdef IP_DROP_MEMBERSHIP
110
    if (addr->sa_family == AF_INET) {
111
        struct ip_mreq mreq;
112

    
113
        mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
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        mreq.imr_interface.s_addr= INADDR_ANY;
115
        if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
116
            av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP): %s\n", strerror(errno));
117
            return -1;
118
        }
119
    }
120
#endif
121
#ifdef CONFIG_IPV6
122
    if (addr->sa_family == AF_INET6) {
123
        struct ipv6_mreq mreq6;
124

    
125
        memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
126
        mreq6.ipv6mr_interface= 0;
127
        if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
128
            av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP): %s\n", strerror(errno));
129
            return -1;
130
        }
131
    }
132
#endif
133
    return 0;
134
}
135

    
136
#ifdef CONFIG_IPV6
137
static struct addrinfo* udp_ipv6_resolve_host(const char *hostname, int port, int type, int family, int flags) {
138
    struct addrinfo hints, *res = 0;
139
    int error;
140
    char sport[16];
141
    const char *node = 0, *service = "0";
142

    
143
    if (port > 0) {
144
        snprintf(sport, sizeof(sport), "%d", port);
145
        service = sport;
146
    }
147
    if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
148
        node = hostname;
149
    }
150
    memset(&hints, 0, sizeof(hints));
151
    hints.ai_socktype = type;
152
    hints.ai_family   = family;
153
    hints.ai_flags = flags;
154
    if ((error = getaddrinfo(node, service, &hints, &res))) {
155
        av_log(NULL, AV_LOG_ERROR, "udp_ipv6_resolve_host: %s\n", gai_strerror(error));
156
    }
157

    
158
    return res;
159
}
160

    
161
static int udp_set_url(struct sockaddr_storage *addr, const char *hostname, int port) {
162
    struct addrinfo *res0;
163
    int addr_len;
164

    
165
    res0 = udp_ipv6_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
166
    if (res0 == 0) return AVERROR(EIO);
167
    memcpy(addr, res0->ai_addr, res0->ai_addrlen);
168
    addr_len = res0->ai_addrlen;
169
    freeaddrinfo(res0);
170

    
171
    return addr_len;
172
}
173

    
174
static int is_multicast_address(struct sockaddr_storage *addr)
175
{
176
    if (addr->ss_family == AF_INET) {
177
        return IN_MULTICAST(ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr));
178
    }
179
    if (addr->ss_family == AF_INET6) {
180
        return IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)addr)->sin6_addr);
181
    }
182

    
183
    return 0;
184
}
185

    
186
static int udp_socket_create(UDPContext *s, struct sockaddr_storage *addr, int *addr_len)
187
{
188
    int udp_fd = -1;
189
    struct addrinfo *res0 = NULL, *res = NULL;
190
    int family = AF_UNSPEC;
191

    
192
    if (((struct sockaddr *) &s->dest_addr)->sa_family)
193
        family = ((struct sockaddr *) &s->dest_addr)->sa_family;
194
    res0 = udp_ipv6_resolve_host(0, s->local_port, SOCK_DGRAM, family, AI_PASSIVE);
195
    if (res0 == 0)
196
        goto fail;
197
    for (res = res0; res; res=res->ai_next) {
198
        udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
199
        if (udp_fd > 0) break;
200
        av_log(NULL, AV_LOG_ERROR, "socket: %s\n", strerror(errno));
201
    }
202

    
203
    if (udp_fd < 0)
204
        goto fail;
205

    
206
    memcpy(addr, res->ai_addr, res->ai_addrlen);
207
    *addr_len = res->ai_addrlen;
208

    
209
    freeaddrinfo(res0);
210

    
211
    return udp_fd;
212

    
213
 fail:
214
    if (udp_fd >= 0)
215
        closesocket(udp_fd);
216
    if(res0)
217
        freeaddrinfo(res0);
218
    return -1;
219
}
220

    
221
static int udp_port(struct sockaddr_storage *addr, int addr_len)
222
{
223
    char sbuf[sizeof(int)*3+1];
224

    
225
    if (getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0,  sbuf, sizeof(sbuf), NI_NUMERICSERV) != 0) {
226
        av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", strerror(errno));
227
        return -1;
228
    }
229

    
230
    return strtol(sbuf, NULL, 10);
231
}
232

    
233
#else
234

    
235
static int udp_set_url(struct sockaddr_in *addr, const char *hostname, int port)
236
{
237
    /* set the destination address */
238
    if (resolve_host(&addr->sin_addr, hostname) < 0)
239
        return AVERROR(EIO);
240
    addr->sin_family = AF_INET;
241
    addr->sin_port = htons(port);
242

    
243
    return sizeof(struct sockaddr_in);
244
}
245

    
246
static int is_multicast_address(struct sockaddr_in *addr)
247
{
248
    return IN_MULTICAST(ntohl(addr->sin_addr.s_addr));
249
}
250

    
251
static int udp_socket_create(UDPContext *s, struct sockaddr_in *addr, int *addr_len)
252
{
253
    int fd;
254

    
255
    fd = socket(AF_INET, SOCK_DGRAM, 0);
256
    if (fd < 0)
257
        return -1;
258

    
259
    addr->sin_family = AF_INET;
260
    addr->sin_addr.s_addr = htonl (INADDR_ANY);
261
    addr->sin_port = htons(s->local_port);
262
    *addr_len = sizeof(struct sockaddr_in);
263

    
264
    return fd;
265
}
266

    
267
static int udp_port(struct sockaddr_in *addr, int len)
268
{
269
    return ntohs(addr->sin_port);
270
}
271
#endif /* CONFIG_IPV6 */
272

    
273

    
274
/**
275
 * If no filename is given to av_open_input_file because you want to
276
 * get the local port first, then you must call this function to set
277
 * the remote server address.
278
 *
279
 * url syntax: udp://host:port[?option=val...]
280
 * option: 'ttl=n'       : set the ttl value (for multicast only)
281
 *         'localport=n' : set the local port
282
 *         'pkt_size=n'  : set max packet size
283
 *         'reuse=1'     : enable reusing the socket
284
 *
285
 * @param s1 media file context
286
 * @param uri of the remote server
287
 * @return zero if no error.
288
 */
289
int udp_set_remote_url(URLContext *h, const char *uri)
290
{
291
    UDPContext *s = h->priv_data;
292
    char hostname[256];
293
    int port;
294

    
295
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
296

    
297
    /* set the destination address */
298
    s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port);
299
    if (s->dest_addr_len < 0) {
300
        return AVERROR(EIO);
301
    }
302
    s->is_multicast = is_multicast_address(&s->dest_addr);
303

    
304
    return 0;
305
}
306

    
307
/**
308
 * Return the local port used by the UDP connexion
309
 * @param s1 media file context
310
 * @return the local port number
311
 */
312
int udp_get_local_port(URLContext *h)
313
{
314
    UDPContext *s = h->priv_data;
315
    return s->local_port;
316
}
317

    
318
/**
319
 * Return the udp file handle for select() usage to wait for several RTP
320
 * streams at the same time.
321
 * @param h media file context
322
 */
323
int udp_get_file_handle(URLContext *h)
324
{
325
    UDPContext *s = h->priv_data;
326
    return s->udp_fd;
327
}
328

    
329
/* put it in UDP context */
330
/* return non zero if error */
331
static int udp_open(URLContext *h, const char *uri, int flags)
332
{
333
    char hostname[1024];
334
    int port, udp_fd = -1, tmp;
335
    UDPContext *s = NULL;
336
    int is_output;
337
    const char *p;
338
    char buf[256];
339
#ifndef CONFIG_IPV6
340
    struct sockaddr_in my_addr;
341
#else
342
    struct sockaddr_storage my_addr;
343
#endif
344
    int len;
345

    
346
    h->is_streamed = 1;
347
    h->max_packet_size = 1472;
348

    
349
    is_output = (flags & URL_WRONLY);
350

    
351
    s = av_mallocz(sizeof(UDPContext));
352
    if (!s)
353
        return AVERROR(ENOMEM);
354

    
355
    h->priv_data = s;
356
    s->ttl = 16;
357
    p = strchr(uri, '?');
358
    if (p) {
359
        s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
360
        if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
361
            s->ttl = strtol(buf, NULL, 10);
362
        }
363
        if (find_info_tag(buf, sizeof(buf), "localport", p)) {
364
            s->local_port = strtol(buf, NULL, 10);
365
        }
366
        if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
367
            h->max_packet_size = strtol(buf, NULL, 10);
368
        }
369
    }
370

    
371
    /* fill the dest addr */
372
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
373

    
374
    /* XXX: fix url_split */
375
    if (hostname[0] == '\0' || hostname[0] == '?') {
376
        /* only accepts null hostname if input */
377
        if (flags & URL_WRONLY)
378
            goto fail;
379
    } else {
380
        udp_set_remote_url(h, uri);
381
    }
382

    
383
    if(!ff_network_init())
384
        return AVERROR(EIO);
385

    
386
    if (s->is_multicast && !(h->flags & URL_WRONLY))
387
        s->local_port = port;
388
    udp_fd = udp_socket_create(s, &my_addr, &len);
389
    if (udp_fd < 0)
390
        goto fail;
391

    
392
    if (s->reuse_socket)
393
        if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
394
            goto fail;
395

    
396
    /* the bind is needed to give a port to the socket now */
397
    if (bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0)
398
        goto fail;
399

    
400
    len = sizeof(my_addr);
401
    getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
402
    s->local_port = udp_port(&my_addr, len);
403

    
404
    if (s->is_multicast) {
405
        if (h->flags & URL_WRONLY) {
406
            /* output */
407
            if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
408
                goto fail;
409
        } else {
410
            /* input */
411
            if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
412
                goto fail;
413
        }
414
    }
415

    
416
    if (is_output) {
417
        /* limit the tx buf size to limit latency */
418
        tmp = UDP_TX_BUF_SIZE;
419
        if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
420
            av_log(NULL, AV_LOG_ERROR, "setsockopt(SO_SNDBUF): %s\n", strerror(errno));
421
            goto fail;
422
        }
423
    } else {
424
        /* set udp recv buffer size to the largest possible udp packet size to
425
         * avoid losing data on OSes that set this too low by default. */
426
        tmp = UDP_MAX_PKT_SIZE;
427
        setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp));
428
    }
429

    
430
    s->udp_fd = udp_fd;
431
    return 0;
432
 fail:
433
    if (udp_fd >= 0)
434
        closesocket(udp_fd);
435
    av_free(s);
436
    return AVERROR(EIO);
437
}
438

    
439
static int udp_read(URLContext *h, uint8_t *buf, int size)
440
{
441
    UDPContext *s = h->priv_data;
442
    int len;
443

    
444
    for(;;) {
445
        len = recv(s->udp_fd, buf, size, 0);
446
        if (len < 0) {
447
            if (ff_neterrno() != FF_NETERROR(EAGAIN) &&
448
                ff_neterrno() != FF_NETERROR(EINTR))
449
                return AVERROR(EIO);
450
        } else {
451
            break;
452
        }
453
    }
454
    return len;
455
}
456

    
457
static int udp_write(URLContext *h, uint8_t *buf, int size)
458
{
459
    UDPContext *s = h->priv_data;
460
    int ret;
461

    
462
    for(;;) {
463
        ret = sendto (s->udp_fd, buf, size, 0,
464
                      (struct sockaddr *) &s->dest_addr,
465
                      s->dest_addr_len);
466
        if (ret < 0) {
467
            if (ff_neterrno() != FF_NETERROR(EINTR) &&
468
                ff_neterrno() != FF_NETERROR(EAGAIN))
469
                return AVERROR(EIO);
470
        } else {
471
            break;
472
        }
473
    }
474
    return size;
475
}
476

    
477
static int udp_close(URLContext *h)
478
{
479
    UDPContext *s = h->priv_data;
480

    
481
    if (s->is_multicast && !(h->flags & URL_WRONLY))
482
        udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
483
    closesocket(s->udp_fd);
484
    ff_network_close();
485
    av_free(s);
486
    return 0;
487
}
488

    
489
URLProtocol udp_protocol = {
490
    "udp",
491
    udp_open,
492
    udp_read,
493
    udp_write,
494
    NULL, /* seek */
495
    udp_close,
496
};