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ffmpeg / libavformat / udp.c @ a8bde059

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1
/*
2
 * UDP prototype streaming system
3
 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard.
4
 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg 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
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 * Lesser General Public License for more details.
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 *
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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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 */
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#include "avformat.h"
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#include <unistd.h>
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#include "network.h"
24

    
25
#ifndef IPV6_ADD_MEMBERSHIP
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#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
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#define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
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#endif
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30
typedef struct {
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    int udp_fd;
32
    int ttl;
33
    int is_multicast;
34
    int local_port;
35
    int reuse_socket;
36
#ifndef CONFIG_IPV6
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    struct ip_mreq mreq;
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    struct sockaddr_in dest_addr;
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#else
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    struct sockaddr_storage dest_addr;
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#endif
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    size_t dest_addr_len;
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} UDPContext;
44

    
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#define UDP_TX_BUF_SIZE 32768
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#define UDP_MAX_PKT_SIZE 65536
47

    
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static int udp_ipv6_set_multicast_ttl(int sockfd, int mcastTTL, struct sockaddr *addr) {
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#ifdef IP_MULTICAST_TTL
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    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;
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        }
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    }
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#endif
57
#ifdef CONFIG_IPV6
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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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#endif
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    return 0;
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}
67

    
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static int udp_ipv6_join_multicast_group(int sockfd, struct sockaddr *addr) {
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#ifdef IP_ADD_MEMBERSHIP
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    if (addr->sa_family == AF_INET) {
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        struct ip_mreq mreq;
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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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#endif
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#ifdef CONFIG_IPV6
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    if (addr->sa_family == AF_INET6) {
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        struct ipv6_mreq mreq6;
84

    
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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) {
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            perror("setsockopt(IPV6_ADD_MEMBERSHIP)");
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            return -1;
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        }
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    }
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#endif
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    return 0;
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}
95

    
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static int udp_ipv6_leave_multicast_group(int sockfd, struct sockaddr *addr) {
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#ifdef IP_DROP_MEMBERSHIP
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    if (addr->sa_family == AF_INET) {
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        struct ip_mreq mreq;
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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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    }
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#endif
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#ifdef CONFIG_IPV6
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    if (addr->sa_family == AF_INET6) {
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        struct ipv6_mreq mreq6;
112

    
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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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        }
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    }
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#endif
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    return 0;
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}
123

    
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#ifdef CONFIG_IPV6
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static struct addrinfo* udp_ipv6_resolve_host(const char *hostname, int port, int type, int family, int flags) {
126
    struct addrinfo hints, *res = 0;
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    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] != '?')) {
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        node = hostname;
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    }
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    memset(&hints, 0, sizeof(hints));
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    hints.ai_socktype = type;
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    hints.ai_family   = family;
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    hints.ai_flags = flags;
142
    if ((error = getaddrinfo(node, service, &hints, &res))) {
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        av_log(NULL, AV_LOG_ERROR, "udp_ipv6_resolve_host: %s\n", gai_strerror(error));
144
    }
145

    
146
    return res;
147
}
148

    
149
static int udp_ipv6_set_remote_url(URLContext *h, const char *uri) {
150
    UDPContext *s = h->priv_data;
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    char hostname[256];
152
    int port;
153
    struct addrinfo *res0;
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    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
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    res0 = udp_ipv6_resolve_host(hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
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    if (res0 == 0) return AVERROR(EIO);
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    memcpy(&s->dest_addr, res0->ai_addr, res0->ai_addrlen);
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    s->dest_addr_len = res0->ai_addrlen;
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    freeaddrinfo(res0);
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    return 0;
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}
162

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

    
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    if (((struct sockaddr *) &s->dest_addr)->sa_family)
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        family = ((struct sockaddr *) &s->dest_addr)->sa_family;
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    res0 = udp_ipv6_resolve_host(0, s->local_port, SOCK_DGRAM, family, AI_PASSIVE);
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    if (res0 == 0)
177
        goto fail;
178
    for (res = res0; res; res=res->ai_next) {
179
        udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
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        if (udp_fd > 0) break;
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        perror("socket");
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    }
183

    
184
    if (udp_fd < 0)
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        goto fail;
186

    
187
    if (bind(udp_fd, res0->ai_addr, res0->ai_addrlen) < 0) {
188
        perror("bind");
189
        goto fail;
190
    }
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    freeaddrinfo(res0);
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        res0 = NULL;
193

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

    
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    if (getnameinfo((struct sockaddr *)&clientaddr, addrlen, hbuf, sizeof(hbuf),  sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
201
        perror("getnameinfo");
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        goto fail;
203
    }
204

    
205
    s->local_port = strtol(sbuf, NULL, 10);
206

    
207
    return udp_fd;
208

    
209
 fail:
210
    if (udp_fd >= 0)
211
        closesocket(udp_fd);
212
    if(res0)
213
        freeaddrinfo(res0);
214
    return -1;
215
}
216

    
217
#endif /* CONFIG_IPV6 */
218

    
219

    
220
/**
221
 * If no filename is given to av_open_input_file because you want to
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 * get the local port first, then you must call this function to set
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 * the remote server address.
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 *
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 * url syntax: udp://host:port[?option=val...]
226
 * option: 'multicast=1' : enable multicast
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 *         'ttl=n'       : set the ttl value (for multicast only)
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 *         'localport=n' : set the local port
229
 *         'pkt_size=n'  : set max packet size
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 *         'reuse=1'     : enable reusing the socket
231
 *
232
 * @param s1 media file context
233
 * @param uri of the remote server
234
 * @return zero if no error.
235
 */
236
int udp_set_remote_url(URLContext *h, const char *uri)
237
{
238
#ifdef CONFIG_IPV6
239
    return udp_ipv6_set_remote_url(h, uri);
240
#else
241
    UDPContext *s = h->priv_data;
242
    char hostname[256];
243
    int port;
244

    
245
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
246

    
247
    /* set the destination address */
248
    if (resolve_host(&s->dest_addr.sin_addr, hostname) < 0)
249
        return AVERROR(EIO);
250
    s->dest_addr.sin_family = AF_INET;
251
    s->dest_addr.sin_port = htons(port);
252
    s->dest_addr_len = sizeof(s->dest_addr);
253
    return 0;
254
#endif
255
}
256

    
257
/**
258
 * Return the local port used by the UDP connexion
259
 * @param s1 media file context
260
 * @return the local port number
261
 */
262
int udp_get_local_port(URLContext *h)
263
{
264
    UDPContext *s = h->priv_data;
265
    return s->local_port;
266
}
267

    
268
/**
269
 * Return the udp file handle for select() usage to wait for several RTP
270
 * streams at the same time.
271
 * @param h media file context
272
 */
273
int udp_get_file_handle(URLContext *h)
274
{
275
    UDPContext *s = h->priv_data;
276
    return s->udp_fd;
277
}
278

    
279
/* put it in UDP context */
280
/* return non zero if error */
281
static int udp_open(URLContext *h, const char *uri, int flags)
282
{
283
    char hostname[1024];
284
    int port, udp_fd = -1, tmp;
285
    UDPContext *s = NULL;
286
    int is_output;
287
    const char *p;
288
    char buf[256];
289
#ifndef CONFIG_IPV6
290
    struct sockaddr_in my_addr, my_addr1;
291
    int len;
292
#endif
293

    
294
    h->is_streamed = 1;
295
    h->max_packet_size = 1472;
296

    
297
    is_output = (flags & URL_WRONLY);
298

    
299
    s = av_mallocz(sizeof(UDPContext));
300
    if (!s)
301
        return AVERROR(ENOMEM);
302

    
303
    h->priv_data = s;
304
    s->ttl = 16;
305
    s->is_multicast = 0;
306
    s->local_port = 0;
307
    s->reuse_socket = 0;
308
    p = strchr(uri, '?');
309
    if (p) {
310
        s->is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
311
        s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
312
        if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
313
            s->ttl = strtol(buf, NULL, 10);
314
        }
315
        if (find_info_tag(buf, sizeof(buf), "localport", p)) {
316
            s->local_port = strtol(buf, NULL, 10);
317
        }
318
        if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
319
            h->max_packet_size = strtol(buf, NULL, 10);
320
        }
321
    }
322

    
323
    /* fill the dest addr */
324
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
325

    
326
    /* XXX: fix url_split */
327
    if (hostname[0] == '\0' || hostname[0] == '?') {
328
        /* only accepts null hostname if input */
329
        if (s->is_multicast || (flags & URL_WRONLY))
330
            goto fail;
331
    } else {
332
        udp_set_remote_url(h, uri);
333
    }
334

    
335
    if(!ff_network_init())
336
        return AVERROR(EIO);
337

    
338
#ifndef CONFIG_IPV6
339
    udp_fd = socket(AF_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
    if (s->reuse_socket)
353
        if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
354
            goto fail;
355

    
356
    /* the bind is needed to give a port to the socket now */
357
    if (bind(udp_fd,(struct sockaddr *)&my_addr, sizeof(my_addr)) < 0)
358
        goto fail;
359

    
360
    len = sizeof(my_addr1);
361
    getsockname(udp_fd, (struct sockaddr *)&my_addr1, &len);
362
    s->local_port = ntohs(my_addr1.sin_port);
363
#else
364
    if (s->is_multicast && !(h->flags & URL_WRONLY))
365
        s->local_port = port;
366
    udp_fd = udp_ipv6_set_local(h);
367
    if (udp_fd < 0)
368
        goto fail;
369
#endif /* CONFIG_IPV6 */
370
    if (s->is_multicast) {
371
        if (h->flags & URL_WRONLY) {
372
            /* output */
373
            if (udp_ipv6_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
374
                goto fail;
375
        } else {
376
            /* input */
377
            if (udp_ipv6_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
378
                goto fail;
379
        }
380
    }
381

    
382
    if (is_output) {
383
        /* limit the tx buf size to limit latency */
384
        tmp = UDP_TX_BUF_SIZE;
385
        if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
386
            perror("setsockopt sndbuf");
387
            goto fail;
388
        }
389
    } else {
390
        /* set udp recv buffer size to the largest possible udp packet size to
391
         * avoid losing data on OSes that set this too low by default. */
392
        tmp = UDP_MAX_PKT_SIZE;
393
        setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp));
394
    }
395

    
396
    s->udp_fd = udp_fd;
397
    return 0;
398
 fail:
399
    if (udp_fd >= 0)
400
        closesocket(udp_fd);
401
    av_free(s);
402
    return AVERROR(EIO);
403
}
404

    
405
static int udp_read(URLContext *h, uint8_t *buf, int size)
406
{
407
    UDPContext *s = h->priv_data;
408
#ifndef CONFIG_IPV6
409
    struct sockaddr_in from;
410
#else
411
    struct sockaddr_storage from;
412
#endif
413
    socklen_t from_len;
414
    int len;
415

    
416
    for(;;) {
417
        from_len = sizeof(from);
418
        len = recvfrom (s->udp_fd, buf, size, 0,
419
                        (struct sockaddr *)&from, &from_len);
420
        if (len < 0) {
421
            if (ff_neterrno() != FF_NETERROR(EAGAIN) &&
422
                ff_neterrno() != FF_NETERROR(EINTR))
423
                return AVERROR(EIO);
424
        } else {
425
            break;
426
        }
427
    }
428
    return len;
429
}
430

    
431
static int udp_write(URLContext *h, uint8_t *buf, int size)
432
{
433
    UDPContext *s = h->priv_data;
434
    int ret;
435

    
436
    for(;;) {
437
        ret = sendto (s->udp_fd, buf, size, 0,
438
                      (struct sockaddr *) &s->dest_addr,
439
                      s->dest_addr_len);
440
        if (ret < 0) {
441
            if (ff_neterrno() != FF_NETERROR(EINTR) &&
442
                ff_neterrno() != FF_NETERROR(EAGAIN))
443
                return AVERROR(EIO);
444
        } else {
445
            break;
446
        }
447
    }
448
    return size;
449
}
450

    
451
static int udp_close(URLContext *h)
452
{
453
    UDPContext *s = h->priv_data;
454

    
455
    if (s->is_multicast && !(h->flags & URL_WRONLY))
456
        udp_ipv6_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
457
    closesocket(s->udp_fd);
458
    ff_network_close();
459
    av_free(s);
460
    return 0;
461
}
462

    
463
URLProtocol udp_protocol = {
464
    "udp",
465
    udp_open,
466
    udp_read,
467
    udp_write,
468
    NULL, /* seek */
469
    udp_close,
470
};