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1
/*
2
 * UDP prototype streaming system
3
 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard.
4
 *
5
 * This library is free software; you can redistribute it and/or
6
 * modify it under the terms of the GNU Lesser General Public
7
 * License as published by the Free Software Foundation; either
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 * version 2 of the License, or (at your option) any later version.
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 *
10
 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13
 * Lesser General Public License for more details.
14
 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18
 */
19
#include "avformat.h"
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#include <unistd.h>
21
#include <sys/types.h>
22
#include <sys/socket.h>
23
#include <netinet/in.h>
24
#ifndef __BEOS__
25
# include <arpa/inet.h>
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#else
27
# include "barpainet.h"
28
#endif
29
#include <netdb.h>
30

    
31
#ifndef IPV6_ADD_MEMBERSHIP
32
#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
33
#define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
34
#endif
35

    
36
typedef struct {
37
    int udp_fd;
38
    int ttl;
39
    int is_multicast;
40
    int local_port;
41
#ifndef CONFIG_IPV6
42
    struct ip_mreq mreq;
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    struct sockaddr_in dest_addr;
44
#else
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    struct sockaddr_storage dest_addr;
46
    size_t dest_addr_len;
47
#endif
48
} UDPContext;
49

    
50
#define UDP_TX_BUF_SIZE 32768
51

    
52
#ifdef CONFIG_IPV6
53

    
54
int udp_ipv6_is_multicast_address(const struct sockaddr *addr) {
55
    if (addr->sa_family == AF_INET)
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        return IN_MULTICAST(ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr));
57
    if (addr->sa_family == AF_INET6)
58
        return IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)addr)->sin6_addr);
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    return -1;
60
}
61

    
62
int udp_ipv6_set_multicast_ttl(int sockfd, int mcastTTL, struct sockaddr *addr) {
63
    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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            perror("setsockopt(IP_MULTICAST_TTL)");
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            return -1;
67
        }
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    }
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    if (addr->sa_family == AF_INET6) {
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        if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_MULTICAST_HOPS, &mcastTTL, sizeof(mcastTTL)) < 0) {
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            perror("setsockopt(IPV6_MULTICAST_HOPS)");
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            return -1;
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        }
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    }
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    return 0;
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}
77

    
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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;
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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;
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        }
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    }
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    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) {
93
            perror("setsockopt(IPV6_ADD_MEMBERSHIP)");
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            return -1;
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        }
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    }
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    return 0;
98
}
99

    
100
int udp_ipv6_leave_multicast_group(int sockfd, struct sockaddr *addr) {
101
    struct ip_mreq   mreq;
102
    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_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
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            perror("setsockopt(IP_DROP_MEMBERSHIP)");
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            return -1;
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        }
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    }
111
    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) {
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            perror("setsockopt(IPV6_DROP_MEMBERSHIP)");
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            return -1;
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        }
118
    }
119
    return 0;
120
}
121

    
122
struct addrinfo* udp_ipv6_resolve_host(const char *hostname, int port, int type, int family, int flags) {
123
    struct addrinfo hints, *res = 0;
124
    int error;
125
    char sport[16];
126
    const char *node = 0, *service = 0;
127

    
128
    if (port > 0) {
129
        snprintf(sport, sizeof(sport), "%d", port);
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        service = sport;
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    }
132
    if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
133
        node = hostname;
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    }
135
    if ((node) || (service)) {
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        memset(&hints, 0, sizeof(hints));
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        hints.ai_socktype = type;
138
        hints.ai_family   = family;
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        hints.ai_flags = flags;
140
        if ((error = getaddrinfo(node, service, &hints, &res))) {
141
            av_log(NULL, AV_LOG_ERROR, "udp_ipv6_resolve_host: %s\n", gai_strerror(error));
142
        }
143
    }
144
    return res;
145
}
146

    
147
int udp_ipv6_set_remote_url(URLContext *h, const char *uri) {
148
    UDPContext *s = h->priv_data;
149
    char hostname[256];
150
    int port;
151
    struct addrinfo *res0;
152
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
153
    res0 = udp_ipv6_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
154
    if (res0 == 0) return AVERROR_IO;
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    memcpy(&s->dest_addr, res0->ai_addr, res0->ai_addrlen);
156
    s->dest_addr_len = res0->ai_addrlen;
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    freeaddrinfo(res0);
158
    return 0;
159
}
160

    
161
int udp_ipv6_set_local(URLContext *h) {
162
    UDPContext *s = h->priv_data;
163
    int udp_fd = -1;
164
    struct sockaddr_storage clientaddr;
165
    socklen_t addrlen;
166
    char sbuf[NI_MAXSERV];
167
    char hbuf[NI_MAXHOST];
168
    struct addrinfo *res0 = NULL, *res = NULL;
169

    
170
    if (s->local_port != 0) {
171
        res0 = udp_ipv6_resolve_host(0, s->local_port, SOCK_DGRAM, AF_UNSPEC, AI_PASSIVE);
172
        if (res0 == 0)
173
            goto fail;
174
        for (res = res0; res; res=res->ai_next) {
175
            udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
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            if (udp_fd > 0) break;
177
            perror("socket");
178
        }
179
    } else {
180
        udp_fd = socket(s->dest_addr.ss_family, SOCK_DGRAM, 0);
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        if (udp_fd < 0)
182
            perror("socket");
183
    }
184

    
185
    if (udp_fd < 0)
186
        goto fail;
187

    
188
    if (s->local_port != 0) {
189
        if (bind(udp_fd, res0->ai_addr, res0->ai_addrlen) < 0) {
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            perror("bind");
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            goto fail;
192
        }
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        freeaddrinfo(res0);
194
        res0 = NULL;
195
    }
196

    
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    addrlen = sizeof(clientaddr);
198
    if (getsockname(udp_fd, (struct sockaddr *)&clientaddr, &addrlen) < 0) {
199
        perror("getsockname");
200
        goto fail;
201
    }
202

    
203
    if (getnameinfo((struct sockaddr *)&clientaddr, addrlen, hbuf, sizeof(hbuf),  sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
204
        perror("getnameinfo");
205
        goto fail;
206
    }
207

    
208
    s->local_port = strtol(sbuf, NULL, 10);
209

    
210
    return udp_fd;
211

    
212
 fail:
213
    if (udp_fd >= 0)
214
#ifdef CONFIG_BEOS_NETSERVER
215
        closesocket(udp_fd);
216
#else
217
        close(udp_fd);
218
#endif
219
    if(res0)
220
        freeaddrinfo(res0);
221
    return -1;
222
}
223

    
224
#endif
225

    
226

    
227
/**
228
 * If no filename is given to av_open_input_file because you want to
229
 * get the local port first, then you must call this function to set
230
 * the remote server address.
231
 *
232
 * url syntax: udp://host:port[?option=val...]
233
 * option: 'multicast=1' : enable multicast
234
 *         'ttl=n'       : set the ttl value (for multicast only)
235
 *         'localport=n' : set the local port
236
 *         'pkt_size=n'  : set max packet size
237
 *
238
 * @param s1 media file context
239
 * @param uri of the remote server
240
 * @return zero if no error.
241
 */
242
int udp_set_remote_url(URLContext *h, const char *uri)
243
{
244
#ifdef CONFIG_IPV6
245
    return udp_ipv6_set_remote_url(h, uri);
246
#else
247
    UDPContext *s = h->priv_data;
248
    char hostname[256];
249
    int port;
250

    
251
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
252

    
253
    /* set the destination address */
254
    if (resolve_host(&s->dest_addr.sin_addr, hostname) < 0)
255
        return AVERROR_IO;
256
    s->dest_addr.sin_family = AF_INET;
257
    s->dest_addr.sin_port = htons(port);
258
    return 0;
259
#endif
260
}
261

    
262
/**
263
 * Return the local port used by the UDP connexion
264
 * @param s1 media file context
265
 * @return the local port number
266
 */
267
int udp_get_local_port(URLContext *h)
268
{
269
    UDPContext *s = h->priv_data;
270
    return s->local_port;
271
}
272

    
273
/**
274
 * Return the udp file handle for select() usage to wait for several RTP
275
 * streams at the same time.
276
 * @param h media file context
277
 */
278
int udp_get_file_handle(URLContext *h)
279
{
280
    UDPContext *s = h->priv_data;
281
    return s->udp_fd;
282
}
283

    
284
/* put it in UDP context */
285
/* return non zero if error */
286
static int udp_open(URLContext *h, const char *uri, int flags)
287
{
288
    char hostname[1024];
289
    int port, udp_fd = -1, tmp;
290
    UDPContext *s = NULL;
291
    int is_output;
292
    const char *p;
293
    char buf[256];
294
#ifndef CONFIG_IPV6
295
    struct sockaddr_in my_addr, my_addr1;
296
    int len;
297
#endif
298

    
299
    h->is_streamed = 1;
300
    h->max_packet_size = 1472;
301

    
302
    is_output = (flags & URL_WRONLY);
303

    
304
    s = av_malloc(sizeof(UDPContext));
305
    if (!s)
306
        return -ENOMEM;
307

    
308
    h->priv_data = s;
309
    s->ttl = 16;
310
    s->is_multicast = 0;
311
    s->local_port = 0;
312
    p = strchr(uri, '?');
313
    if (p) {
314
        s->is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
315
        if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
316
            s->ttl = strtol(buf, NULL, 10);
317
        }
318
        if (find_info_tag(buf, sizeof(buf), "localport", p)) {
319
            s->local_port = strtol(buf, NULL, 10);
320
        }
321
        if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
322
            h->max_packet_size = strtol(buf, NULL, 10);
323
        }
324
    }
325

    
326
    /* fill the dest addr */
327
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
328

    
329
    /* XXX: fix url_split */
330
    if (hostname[0] == '\0' || hostname[0] == '?') {
331
        /* only accepts null hostname if input */
332
        if (s->is_multicast || (flags & URL_WRONLY))
333
            goto fail;
334
    } else {
335
        udp_set_remote_url(h, uri);
336
    }
337

    
338
#ifndef CONFIG_IPV6
339
    udp_fd = socket(PF_INET, SOCK_DGRAM, 0);
340
    if (udp_fd < 0)
341
        goto fail;
342

    
343
    my_addr.sin_family = AF_INET;
344
    my_addr.sin_addr.s_addr = htonl (INADDR_ANY);
345
    if (s->is_multicast && !(h->flags & URL_WRONLY)) {
346
        /* special case: the bind must be done on the multicast address port */
347
        my_addr.sin_port = s->dest_addr.sin_port;
348
    } else {
349
        my_addr.sin_port = htons(s->local_port);
350
    }
351

    
352
    /* the bind is needed to give a port to the socket now */
353
    if (bind(udp_fd,(struct sockaddr *)&my_addr, sizeof(my_addr)) < 0)
354
        goto fail;
355

    
356
    len = sizeof(my_addr1);
357
    getsockname(udp_fd, (struct sockaddr *)&my_addr1, &len);
358
    s->local_port = ntohs(my_addr1.sin_port);
359

    
360
#ifndef CONFIG_BEOS_NETSERVER
361
    if (s->is_multicast) {
362
        if (h->flags & URL_WRONLY) {
363
            /* output */
364
            if (setsockopt(udp_fd, IPPROTO_IP, IP_MULTICAST_TTL,
365
                           &s->ttl, sizeof(s->ttl)) < 0) {
366
                perror("IP_MULTICAST_TTL");
367
                goto fail;
368
            }
369
        } else {
370
            /* input */
371
            memset(&s->mreq, 0, sizeof(s->mreq));
372
            s->mreq.imr_multiaddr = s->dest_addr.sin_addr;
373
            s->mreq.imr_interface.s_addr = htonl (INADDR_ANY);
374
            if (setsockopt(udp_fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
375
                           &s->mreq, sizeof(s->mreq)) < 0) {
376
                perror("rtp: IP_ADD_MEMBERSHIP");
377
                goto fail;
378
            }
379
        }
380
    }
381
#endif
382
#else
383
    if (s->is_multicast && !(h->flags & URL_WRONLY))
384
        s->local_port = port;
385
    udp_fd = udp_ipv6_set_local(h);
386
    if (udp_fd < 0)
387
        goto fail;
388
#ifndef CONFIG_BEOS_NETSERVER
389
    if (s->is_multicast) {
390
        if (h->flags & URL_WRONLY) {
391
            if (udp_ipv6_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
392
                goto fail;
393
        } else {
394
            if (udp_ipv6_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
395
                goto fail;
396
        }
397
    }
398
#endif
399
#endif
400

    
401
    if (is_output) {
402
        /* limit the tx buf size to limit latency */
403
        tmp = UDP_TX_BUF_SIZE;
404
        if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
405
            perror("setsockopt sndbuf");
406
            goto fail;
407
        }
408
    }
409

    
410
    s->udp_fd = udp_fd;
411
    return 0;
412
 fail:
413
    if (udp_fd >= 0)
414
#ifdef CONFIG_BEOS_NETSERVER
415
        closesocket(udp_fd);
416
#else
417
        close(udp_fd);
418
#endif
419
    av_free(s);
420
    return AVERROR_IO;
421
}
422

    
423
static int udp_read(URLContext *h, uint8_t *buf, int size)
424
{
425
    UDPContext *s = h->priv_data;
426
#ifndef CONFIG_IPV6
427
    struct sockaddr_in from;
428
#else
429
    struct sockaddr_storage from;
430
#endif
431
    int from_len, len;
432

    
433
    for(;;) {
434
        from_len = sizeof(from);
435
        len = recvfrom (s->udp_fd, buf, size, 0,
436
                        (struct sockaddr *)&from, &from_len);
437
        if (len < 0) {
438
            if (errno != EAGAIN && errno != EINTR)
439
                return AVERROR_IO;
440
        } else {
441
            break;
442
        }
443
    }
444
    return len;
445
}
446

    
447
static int udp_write(URLContext *h, uint8_t *buf, int size)
448
{
449
    UDPContext *s = h->priv_data;
450
    int ret;
451

    
452
    for(;;) {
453
        ret = sendto (s->udp_fd, buf, size, 0,
454
                      (struct sockaddr *) &s->dest_addr,
455
#ifndef CONFIG_IPV6
456
                      sizeof (s->dest_addr));
457
#else
458
                      s->dest_addr_len);
459
#endif
460
        if (ret < 0) {
461
            if (errno != EINTR && errno != EAGAIN)
462
                return AVERROR_IO;
463
        } else {
464
            break;
465
        }
466
    }
467
    return size;
468
}
469

    
470
static int udp_close(URLContext *h)
471
{
472
    UDPContext *s = h->priv_data;
473

    
474
#ifndef CONFIG_BEOS_NETSERVER
475
#ifndef CONFIG_IPV6
476
    if (s->is_multicast && !(h->flags & URL_WRONLY)) {
477
        if (setsockopt(s->udp_fd, IPPROTO_IP, IP_DROP_MEMBERSHIP,
478
                       &s->mreq, sizeof(s->mreq)) < 0) {
479
            perror("IP_DROP_MEMBERSHIP");
480
        }
481
    }
482
#else
483
    if (s->is_multicast && !(h->flags & URL_WRONLY))
484
        udp_ipv6_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
485
#endif
486
    close(s->udp_fd);
487
#else
488
    closesocket(s->udp_fd);
489
#endif
490
    av_free(s);
491
    return 0;
492
}
493

    
494
URLProtocol udp_protocol = {
495
    "udp",
496
    udp_open,
497
    udp_read,
498
    udp_write,
499
    NULL, /* seek */
500
    udp_close,
501
};