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ffmpeg / libavformat / udp.c @ d4936869

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1
/*
2
 * UDP prototype streaming system
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 * 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

    
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#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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typedef struct {
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    int udp_fd;
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    int ttl;
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    int is_multicast;
34
    int local_port;
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    int reuse_socket;
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#ifndef CONFIG_IPV6
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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;
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#define UDP_TX_BUF_SIZE 32768
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#define UDP_MAX_PKT_SIZE 65536
46

    
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static int udp_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
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#ifdef CONFIG_IPV6
57
    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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}
66

    
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static int udp_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;
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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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}
94

    
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static int udp_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;
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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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}
122

    
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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) {
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    struct addrinfo hints, *res = 0;
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    int error;
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    char sport[16];
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    const char *node = 0, *service = "0";
129

    
130
    if (port > 0) {
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        snprintf(sport, sizeof(sport), "%d", port);
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        service = sport;
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    }
134
    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;
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    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));
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    }
144

    
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    return res;
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}
147

    
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static int udp_set_url(struct sockaddr_storage *addr, const char *hostname, int port) {
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    struct addrinfo *res0;
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    int addr_len;
151

    
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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(addr, res0->ai_addr, res0->ai_addrlen);
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    addr_len = res0->ai_addrlen;
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    freeaddrinfo(res0);
157

    
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    return addr_len;
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}
160

    
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static int udp_ipv6_set_local(URLContext *h) {
162
    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;
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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)
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        goto fail;
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    for (res = res0; res; res=res->ai_next) {
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        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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    }
181

    
182
    if (udp_fd < 0)
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        goto fail;
184

    
185
    if (bind(udp_fd, res0->ai_addr, res0->ai_addrlen) < 0) {
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        perror("bind");
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        goto fail;
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    }
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    freeaddrinfo(res0);
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        res0 = NULL;
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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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    }
197

    
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    if (getnameinfo((struct sockaddr *)&clientaddr, addrlen, hbuf, sizeof(hbuf),  sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
199
        perror("getnameinfo");
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        goto fail;
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    }
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    s->local_port = strtol(sbuf, NULL, 10);
204

    
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    return udp_fd;
206

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

    
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#else
216

    
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static int udp_set_url(struct sockaddr_in *addr, const char *hostname, int port)
218
{
219
    /* set the destination address */
220
    if (resolve_host(&addr->sin_addr, hostname) < 0)
221
        return AVERROR(EIO);
222
    addr->sin_family = AF_INET;
223
    addr->sin_port = htons(port);
224

    
225
    return sizeof(struct sockaddr_in);
226
}
227

    
228
#endif /* CONFIG_IPV6 */
229

    
230

    
231
/**
232
 * If no filename is given to av_open_input_file because you want to
233
 * 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...]
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 * option: 'multicast=1' : enable multicast
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 *         'ttl=n'       : set the ttl value (for multicast only)
239
 *         'localport=n' : set the local port
240
 *         'pkt_size=n'  : set max packet size
241
 *         'reuse=1'     : enable reusing the socket
242
 *
243
 * @param s1 media file context
244
 * @param uri of the remote server
245
 * @return zero if no error.
246
 */
247
int udp_set_remote_url(URLContext *h, const char *uri)
248
{
249
    UDPContext *s = h->priv_data;
250
    char hostname[256];
251
    int port;
252

    
253
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
254

    
255
    /* set the destination address */
256
    s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port);
257
    if (s->dest_addr_len < 0) {
258
        return AVERROR(EIO);
259
    }
260

    
261
    return 0;
262
}
263

    
264
/**
265
 * Return the local port used by the UDP connexion
266
 * @param s1 media file context
267
 * @return the local port number
268
 */
269
int udp_get_local_port(URLContext *h)
270
{
271
    UDPContext *s = h->priv_data;
272
    return s->local_port;
273
}
274

    
275
/**
276
 * Return the udp file handle for select() usage to wait for several RTP
277
 * streams at the same time.
278
 * @param h media file context
279
 */
280
int udp_get_file_handle(URLContext *h)
281
{
282
    UDPContext *s = h->priv_data;
283
    return s->udp_fd;
284
}
285

    
286
/* put it in UDP context */
287
/* return non zero if error */
288
static int udp_open(URLContext *h, const char *uri, int flags)
289
{
290
    char hostname[1024];
291
    int port, udp_fd = -1, tmp;
292
    UDPContext *s = NULL;
293
    int is_output;
294
    const char *p;
295
    char buf[256];
296
#ifndef CONFIG_IPV6
297
    struct sockaddr_in my_addr;
298
    int len;
299
#endif
300

    
301
    h->is_streamed = 1;
302
    h->max_packet_size = 1472;
303

    
304
    is_output = (flags & URL_WRONLY);
305

    
306
    s = av_mallocz(sizeof(UDPContext));
307
    if (!s)
308
        return AVERROR(ENOMEM);
309

    
310
    h->priv_data = s;
311
    s->ttl = 16;
312
    p = strchr(uri, '?');
313
    if (p) {
314
        s->is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
315
        s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
316
        if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
317
            s->ttl = strtol(buf, NULL, 10);
318
        }
319
        if (find_info_tag(buf, sizeof(buf), "localport", p)) {
320
            s->local_port = strtol(buf, NULL, 10);
321
        }
322
        if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
323
            h->max_packet_size = strtol(buf, NULL, 10);
324
        }
325
    }
326

    
327
    /* fill the dest addr */
328
    url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
329

    
330
    /* XXX: fix url_split */
331
    if (hostname[0] == '\0' || hostname[0] == '?') {
332
        /* only accepts null hostname if input */
333
        if (s->is_multicast || (flags & URL_WRONLY))
334
            goto fail;
335
    } else {
336
        udp_set_remote_url(h, uri);
337
    }
338

    
339
    if(!ff_network_init())
340
        return AVERROR(EIO);
341

    
342
    if (s->is_multicast && !(h->flags & URL_WRONLY))
343
        s->local_port = port;
344
#ifndef CONFIG_IPV6
345
    udp_fd = socket(AF_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
    my_addr.sin_port = htons(s->local_port);
352

    
353
    if (s->reuse_socket)
354
        if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0)
355
            goto fail;
356

    
357
    /* the bind is needed to give a port to the socket now */
358
    if (bind(udp_fd,(struct sockaddr *)&my_addr, sizeof(my_addr)) < 0)
359
        goto fail;
360

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

    
381
    if (is_output) {
382
        /* limit the tx buf size to limit latency */
383
        tmp = UDP_TX_BUF_SIZE;
384
        if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
385
            perror("setsockopt sndbuf");
386
            goto fail;
387
        }
388
    } else {
389
        /* set udp recv buffer size to the largest possible udp packet size to
390
         * avoid losing data on OSes that set this too low by default. */
391
        tmp = UDP_MAX_PKT_SIZE;
392
        setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp));
393
    }
394

    
395
    s->udp_fd = udp_fd;
396
    return 0;
397
 fail:
398
    if (udp_fd >= 0)
399
        closesocket(udp_fd);
400
    av_free(s);
401
    return AVERROR(EIO);
402
}
403

    
404
static int udp_read(URLContext *h, uint8_t *buf, int size)
405
{
406
    UDPContext *s = h->priv_data;
407
    int len;
408

    
409
    for(;;) {
410
        len = recv(s->udp_fd, buf, size, 0);
411
        if (len < 0) {
412
            if (ff_neterrno() != FF_NETERROR(EAGAIN) &&
413
                ff_neterrno() != FF_NETERROR(EINTR))
414
                return AVERROR(EIO);
415
        } else {
416
            break;
417
        }
418
    }
419
    return len;
420
}
421

    
422
static int udp_write(URLContext *h, uint8_t *buf, int size)
423
{
424
    UDPContext *s = h->priv_data;
425
    int ret;
426

    
427
    for(;;) {
428
        ret = sendto (s->udp_fd, buf, size, 0,
429
                      (struct sockaddr *) &s->dest_addr,
430
                      s->dest_addr_len);
431
        if (ret < 0) {
432
            if (ff_neterrno() != FF_NETERROR(EINTR) &&
433
                ff_neterrno() != FF_NETERROR(EAGAIN))
434
                return AVERROR(EIO);
435
        } else {
436
            break;
437
        }
438
    }
439
    return size;
440
}
441

    
442
static int udp_close(URLContext *h)
443
{
444
    UDPContext *s = h->priv_data;
445

    
446
    if (s->is_multicast && !(h->flags & URL_WRONLY))
447
        udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
448
    closesocket(s->udp_fd);
449
    ff_network_close();
450
    av_free(s);
451
    return 0;
452
}
453

    
454
URLProtocol udp_protocol = {
455
    "udp",
456
    udp_open,
457
    udp_read,
458
    udp_write,
459
    NULL, /* seek */
460
    udp_close,
461
};