udp.c 14.2 KB
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/*
 * UDP prototype streaming system
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 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
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 *
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 * This file is part of FFmpeg.
 *
 * 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
 * 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
 * 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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/**
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 * @file libavformat/udp.c
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 * UDP protocol
 */

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#define _BSD_SOURCE     /* Needed for using struct ip_mreq with recent glibc */
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#include "avformat.h"
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#include <unistd.h>
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#include "internal.h"
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#include "network.h"
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#include "os_support.h"
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#if HAVE_SYS_SELECT_H
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#include <sys/select.h>
#endif
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#include <sys/time.h>
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#ifndef IPV6_ADD_MEMBERSHIP
#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
#define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
#endif
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#ifndef IN_MULTICAST
#define IN_MULTICAST(a) ((((uint32_t)(a)) & 0xf0000000) == 0xe0000000)
#endif
#ifndef IN6_IS_ADDR_MULTICAST
#define IN6_IS_ADDR_MULTICAST(a) (((uint8_t *) (a))[0] == 0xff)
#endif
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typedef struct {
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    int udp_fd;
    int ttl;
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    int buffer_size;
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    int is_multicast;
    int local_port;
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    int reuse_socket;
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    struct sockaddr_storage dest_addr;
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    int dest_addr_len;
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} UDPContext;

#define UDP_TX_BUF_SIZE 32768
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#define UDP_MAX_PKT_SIZE 65536
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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) {
        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;
        }
    }
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#endif
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#if defined(IPPROTO_IPV6) && defined(IPV6_MULTICAST_HOPS)
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    if (addr->sa_family == AF_INET6) {
        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));
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            return -1;
        }
    }
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#endif
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    return 0;
}

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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;
        mreq.imr_interface.s_addr= INADDR_ANY;
        if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
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            av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP): %s\n", strerror(errno));
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            return -1;
        }
    }
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#endif
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#if HAVE_STRUCT_IPV6_MREQ
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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));
        mreq6.ipv6mr_interface= 0;
        if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
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            av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP): %s\n", strerror(errno));
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            return -1;
        }
    }
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#endif
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    return 0;
}

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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;
        mreq.imr_interface.s_addr= INADDR_ANY;
        if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
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            av_log(NULL, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP): %s\n", strerror(errno));
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            return -1;
        }
    }
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#endif
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#if HAVE_STRUCT_IPV6_MREQ
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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));
        mreq6.ipv6mr_interface= 0;
        if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
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            av_log(NULL, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP): %s\n", strerror(errno));
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            return -1;
        }
    }
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#endif
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    return 0;
}

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static struct addrinfo* udp_resolve_host(const char *hostname, int port,
                                         int type, int family, int flags)
{
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    struct addrinfo hints, *res = 0;
    int error;
    char sport[16];
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    const char *node = 0, *service = "0";
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    if (port > 0) {
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        snprintf(sport, sizeof(sport), "%d", port);
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        service = sport;
    }
    if ((hostname) && (hostname[0] != '\0') && (hostname[0] != '?')) {
        node = hostname;
    }
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    memset(&hints, 0, sizeof(hints));
    hints.ai_socktype = type;
    hints.ai_family   = family;
    hints.ai_flags = flags;
    if ((error = getaddrinfo(node, service, &hints, &res))) {
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        res = NULL;
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        av_log(NULL, AV_LOG_ERROR, "udp_resolve_host: %s\n", gai_strerror(error));
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    }

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    return res;
}

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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;

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    res0 = udp_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);
    addr_len = res0->ai_addrlen;
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    freeaddrinfo(res0);
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    return addr_len;
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}

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static int is_multicast_address(struct sockaddr_storage *addr)
{
    if (addr->ss_family == AF_INET) {
        return IN_MULTICAST(ntohl(((struct sockaddr_in *)addr)->sin_addr.s_addr));
    }
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#if HAVE_STRUCT_SOCKADDR_IN6
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    if (addr->ss_family == AF_INET6) {
        return IN6_IS_ADDR_MULTICAST(&((struct sockaddr_in6 *)addr)->sin6_addr);
    }
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#endif
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    return 0;
}

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static int udp_socket_create(UDPContext *s,
                             struct sockaddr_storage *addr, int *addr_len)
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{
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    int udp_fd = -1;
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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)
        family = ((struct sockaddr *) &s->dest_addr)->sa_family;
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    res0 = udp_resolve_host(0, s->local_port, SOCK_DGRAM, family, AI_PASSIVE);
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    if (res0 == 0)
        goto fail;
    for (res = res0; res; res=res->ai_next) {
        udp_fd = socket(res->ai_family, SOCK_DGRAM, 0);
        if (udp_fd > 0) break;
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        av_log(NULL, AV_LOG_ERROR, "socket: %s\n", strerror(errno));
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    }
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    if (udp_fd < 0)
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        goto fail;
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    memcpy(addr, res->ai_addr, res->ai_addrlen);
    *addr_len = res->ai_addrlen;
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    freeaddrinfo(res0);
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    return udp_fd;
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 fail:
    if (udp_fd >= 0)
        closesocket(udp_fd);
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    if(res0)
        freeaddrinfo(res0);
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    return -1;
}

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static int udp_port(struct sockaddr_storage *addr, int addr_len)
{
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    char sbuf[sizeof(int)*3+1];
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    if (getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0,  sbuf, sizeof(sbuf), NI_NUMERICSERV) != 0) {
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        av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", strerror(errno));
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        return -1;
    }

    return strtol(sbuf, NULL, 10);
}

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/**
 * If no filename is given to av_open_input_file because you want to
 * get the local port first, then you must call this function to set
 * the remote server address.
 *
 * url syntax: udp://host:port[?option=val...]
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 * option: 'ttl=n'       : set the ttl value (for multicast only)
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 *         'localport=n' : set the local port
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 *         'pkt_size=n'  : set max packet size
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 *         'reuse=1'     : enable reusing the socket
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 *
 * @param s1 media file context
 * @param uri of the remote server
 * @return zero if no error.
 */
int udp_set_remote_url(URLContext *h, const char *uri)
{
    UDPContext *s = h->priv_data;
    char hostname[256];
    int port;
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    ff_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
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    /* set the destination address */
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    s->dest_addr_len = udp_set_url(&s->dest_addr, hostname, port);
    if (s->dest_addr_len < 0) {
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        return AVERROR(EIO);
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    }
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    s->is_multicast = is_multicast_address(&s->dest_addr);
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    return 0;
}

/**
 * Return the local port used by the UDP connexion
 * @param s1 media file context
 * @return the local port number
 */
int udp_get_local_port(URLContext *h)
{
    UDPContext *s = h->priv_data;
    return s->local_port;
}

/**
 * Return the udp file handle for select() usage to wait for several RTP
 * streams at the same time.
 * @param h media file context
 */
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#if (LIBAVFORMAT_VERSION_MAJOR >= 53)
static
#endif
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int udp_get_file_handle(URLContext *h)
{
    UDPContext *s = h->priv_data;
    return s->udp_fd;
}

/* put it in UDP context */
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/* return non zero if error */
static int udp_open(URLContext *h, const char *uri, int flags)
{
    char hostname[1024];
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    int port, udp_fd = -1, tmp, bind_ret = -1;
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    UDPContext *s = NULL;
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    int is_output;
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    const char *p;
    char buf[256];
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    struct sockaddr_storage my_addr;
    int len;
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    h->is_streamed = 1;
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    h->max_packet_size = 1472;
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    is_output = (flags & URL_WRONLY);
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    s = av_mallocz(sizeof(UDPContext));
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    if (!s)
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        return AVERROR(ENOMEM);
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    h->priv_data = s;
    s->ttl = 16;
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    s->buffer_size = is_output ? UDP_TX_BUF_SIZE : UDP_MAX_PKT_SIZE;

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    p = strchr(uri, '?');
    if (p) {
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        s->reuse_socket = find_info_tag(buf, sizeof(buf), "reuse", p);
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        if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
            s->ttl = strtol(buf, NULL, 10);
        }
        if (find_info_tag(buf, sizeof(buf), "localport", p)) {
            s->local_port = strtol(buf, NULL, 10);
        }
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        if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
            h->max_packet_size = strtol(buf, NULL, 10);
        }
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        if (find_info_tag(buf, sizeof(buf), "buffer_size", p)) {
            s->buffer_size = strtol(buf, NULL, 10);
        }
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    }
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    /* fill the dest addr */
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    ff_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
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    /* XXX: fix ff_url_split */
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    if (hostname[0] == '\0' || hostname[0] == '?') {
        /* only accepts null hostname if input */
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        if (flags & URL_WRONLY)
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            goto fail;
    } else {
        udp_set_remote_url(h, uri);
    }
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    if (s->is_multicast && !(h->flags & URL_WRONLY))
        s->local_port = port;
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    udp_fd = udp_socket_create(s, &my_addr, &len);
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    if (udp_fd < 0)
        goto fail;

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

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    /* the bind is needed to give a port to the socket now */
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    /* if multicast, try the multicast address bind first */
    if (s->is_multicast && !(h->flags & URL_WRONLY)) {
        bind_ret = bind(udp_fd,(struct sockaddr *)&s->dest_addr, len);
    }
    /* bind to the local address if not multicast or if the multicast
     * bind failed */
    if (bind_ret < 0 && bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0)
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        goto fail;

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

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    if (s->is_multicast) {
        if (h->flags & URL_WRONLY) {
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            /* output */
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            if (udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr) < 0)
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                goto fail;
        } else {
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            /* input */
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            if (udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr) < 0)
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                goto fail;
        }
    }
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    if (is_output) {
        /* limit the tx buf size to limit latency */
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        tmp = s->buffer_size;
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        if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
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            av_log(NULL, AV_LOG_ERROR, "setsockopt(SO_SNDBUF): %s\n", strerror(errno));
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            goto fail;
        }
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    } else {
        /* set udp recv buffer size to the largest possible udp packet size to
         * avoid losing data on OSes that set this too low by default. */
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        tmp = s->buffer_size;
        if (setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp)) < 0) {
            av_log(NULL, AV_LOG_WARNING, "setsockopt(SO_RECVBUF): %s\n", strerror(errno));
        }
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        /* make the socket non-blocking */
        ff_socket_nonblock(udp_fd, 1);
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    }

    s->udp_fd = udp_fd;
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    return 0;
 fail:
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    if (udp_fd >= 0)
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        closesocket(udp_fd);
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    av_free(s);
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    return AVERROR(EIO);
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}

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static int udp_read(URLContext *h, uint8_t *buf, int size)
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{
    UDPContext *s = h->priv_data;
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    int len;
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    fd_set rfds;
    int ret;
    struct timeval tv;
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    for(;;) {
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        if (url_interrupt_cb())
            return AVERROR(EINTR);
        FD_ZERO(&rfds);
        FD_SET(s->udp_fd, &rfds);
        tv.tv_sec = 0;
        tv.tv_usec = 100 * 1000;
        ret = select(s->udp_fd + 1, &rfds, NULL, NULL, &tv);
        if (ret < 0)
            return AVERROR(EIO);
        if (!(ret > 0 && FD_ISSET(s->udp_fd, &rfds)))
            continue;
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        len = recv(s->udp_fd, buf, size, 0);
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        if (len < 0) {
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            if (ff_neterrno() != FF_NETERROR(EAGAIN) &&
                ff_neterrno() != FF_NETERROR(EINTR))
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                return AVERROR(EIO);
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        } else {
            break;
        }
    }
    return len;
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}

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

    for(;;) {
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        ret = sendto (s->udp_fd, buf, size, 0,
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                      (struct sockaddr *) &s->dest_addr,
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                      s->dest_addr_len);
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        if (ret < 0) {
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            if (ff_neterrno() != FF_NETERROR(EINTR) &&
                ff_neterrno() != FF_NETERROR(EAGAIN))
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                return AVERROR(EIO);
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        } else {
            break;
        }
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    }
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    return size;
}

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

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    if (s->is_multicast && !(h->flags & URL_WRONLY))
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        udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr);
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    closesocket(s->udp_fd);
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    av_free(s);
    return 0;
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}

URLProtocol udp_protocol = {
    "udp",
    udp_open,
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    udp_read,
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    udp_write,
    NULL, /* seek */
    udp_close,
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    .url_get_file_handle = udp_get_file_handle,
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};