/*****************************************************************************
* udp.c:
*****************************************************************************
* Copyright (C) 2004-2006 the VideoLAN team
* Copyright © 2006-2007 Rémi Denis-Courmont
*
* $Id$
*
* Authors: Laurent Aimar <fenrir@videolan.org>
* Rémi Denis-Courmont <rem # videolan.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "vlc_common.h"
#include <errno.h>
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#endif
#include "vlc_network.h"
#ifdef WIN32
# if defined(UNDER_CE)
# undef IP_MULTICAST_TTL
# define IP_MULTICAST_TTL 3
# undef IP_ADD_MEMBERSHIP
# define IP_ADD_MEMBERSHIP 5
# endif
# define EAFNOSUPPORT WSAEAFNOSUPPORT
# define if_nametoindex( str ) atoi( str )
#else
# include <unistd.h>
# ifdef HAVE_NET_IF_H
# include <net/if.h>
# endif
#endif
#ifdef HAVE_LINUX_DCCP_H
# include <linux/dccp.h>
# ifndef SOCK_DCCP /* provisional API */
# define SOCK_DCCP 6
# endif
#endif
#ifndef SOL_IP
# define SOL_IP IPPROTO_IP
#endif
#ifndef SOL_IPV6
# define SOL_IPV6 IPPROTO_IPV6
#endif
#ifndef IPPROTO_IPV6
# define IPPROTO_IPV6 41 /* IANA */
#endif
#ifndef SOL_DCCP
# define SOL_DCCP IPPROTO_DCCP
#endif
#ifndef IPPROTO_DCCP
# define IPPROTO_DCCP 33 /* IANA */
#endif
#ifndef SOL_UDPLITE
# define SOL_UDPLITE IPPROTO_UDPLITE
#endif
#ifndef IPPROTO_UDPLITE
# define IPPROTO_UDPLITE 136 /* IANA */
#endif
#if defined (HAVE_NETINET_UDPLITE_H)
# include <netinet/udplite.h>
#elif defined (__linux__)
/* still missing from glibc 2.6 */
# define UDPLITE_SEND_CSCOV 10
# define UDPLITE_RECV_CSCOV 11
#endif
extern int net_Socket( vlc_object_t *p_this, int i_family, int i_socktype,
int i_protocol );
static int net_ListenSingle (vlc_object_t *obj, const char *host, int port,
int family, int protocol)
{
struct addrinfo hints, *res;
memset (&hints, 0, sizeof( hints ));
hints.ai_family = family;
hints.ai_socktype = SOCK_DGRAM;
hints.ai_flags = AI_PASSIVE;
if (host && !*host)
host = NULL;
msg_Dbg (obj, "net: opening %s datagram port %d", host ?: "any", port);
int val = vlc_getaddrinfo (obj, host, port, &hints, &res);
if (val)
{
msg_Err (obj, "Cannot resolve %s port %d : %s", host, port,
vlc_gai_strerror (val));
return -1;
}
val = -1;
for (const struct addrinfo *ptr = res; ptr != NULL; ptr = ptr->ai_next)
{
int fd = net_Socket (obj, ptr->ai_family, ptr->ai_socktype,
protocol ?: ptr->ai_protocol);
if (fd == -1)
{
msg_Dbg (obj, "socket error: %m");
continue;
}
if (ptr->ai_next != NULL)
{
#ifdef IPV6_V6ONLY
if ((ptr->ai_family != AF_INET6)
|| setsockopt (fd, SOL_IPV6, IPV6_V6ONLY, &(int){ 0 },
sizeof (int)))
#endif
{
msg_Err (obj, "Multiple network protocols present");
msg_Err (obj, "Please select network protocol manually");
}
}
/* Bind the socket */
#if defined (WIN32) || defined (UNDER_CE)
if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
&& (sizeof (struct sockaddr_storage) >= ptr->ai_addrlen))
{
struct sockaddr_in6 dumb =
{
.sin6_family = ptr->ai_addr->sa_family,
.sin6_port = ((struct sockaddr_in *)(ptr->ai_addr))->sin_port
};
bind (fd, (struct sockaddr *)&dumb, ptr->ai_addrlen);
}
else
#endif
if (bind (fd, ptr->ai_addr, ptr->ai_addrlen))
{
msg_Err (obj, "socket bind error (%m)");
net_Close (fd);
continue;
}
if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
&& net_Subscribe (obj, fd, ptr->ai_addr, ptr->ai_addrlen))
{
net_Close (fd);
continue;
}
val = fd;
break;
}
vlc_freeaddrinfo (res);
return val;
}
static int net_SetMcastHopLimit( vlc_object_t *p_this,
int fd, int family, int hlim )
{
int proto, cmd;
/* There is some confusion in the world whether IP_MULTICAST_TTL
* takes a byte or an int as an argument.
* BSD seems to indicate byte so we are going with that and use
* int as a fallback to be safe */
switch( family )
{
#ifdef IP_MULTICAST_TTL
case AF_INET:
proto = SOL_IP;
cmd = IP_MULTICAST_TTL;
break;
#endif
#ifdef IPV6_MULTICAST_HOPS
case AF_INET6:
proto = SOL_IPV6;
cmd = IPV6_MULTICAST_HOPS;
break;
#endif
default:
errno = EAFNOSUPPORT;
msg_Warn( p_this, "%m" );
return VLC_EGENERIC;
}
if( setsockopt( fd, proto, cmd, &hlim, sizeof( hlim ) ) < 0 )
{
/* BSD compatibility */
unsigned char buf;
buf = (unsigned char)(( hlim > 255 ) ? 255 : hlim);
if( setsockopt( fd, proto, cmd, &buf, sizeof( buf ) ) )
return VLC_EGENERIC;
}
return VLC_SUCCESS;
}
static int net_SetMcastOutIface (int fd, int family, int scope)
{
switch (family)
{
#ifdef IPV6_MULTICAST_IF
case AF_INET6:
return setsockopt (fd, SOL_IPV6, IPV6_MULTICAST_IF,
&scope, sizeof (scope));
#endif
#ifdef __linux__
case AF_INET:
{
struct ip_mreqn req = { .imr_ifindex = scope };
return setsockopt (fd, SOL_IP, IP_MULTICAST_IF, &req,
sizeof (req));
}
#endif
}
errno = EAFNOSUPPORT;
return -1;
}
static inline int net_SetMcastOutIPv4 (int fd, struct in_addr ipv4)
{
#ifdef IP_MULTICAST_IF
return setsockopt( fd, SOL_IP, IP_MULTICAST_IF, &ipv4, sizeof (ipv4));
#else
errno = EAFNOSUPPORT;
return -1;
#endif
}
static int net_SetMcastOut (vlc_object_t *p_this, int fd, int family,
const char *iface, const char *addr)
{
if (iface != NULL)
{
int scope = if_nametoindex (iface);
if (scope == 0)
{
msg_Err (p_this, "invalid multicast interface: %s", iface);
return -1;
}
if (net_SetMcastOutIface (fd, family, scope) == 0)
return 0;
msg_Err (p_this, "%s: %m", iface);
}
if (addr != NULL)
{
if (family == AF_INET)
{
struct in_addr ipv4;
if (inet_pton (AF_INET, addr, &ipv4) <= 0)
{
msg_Err (p_this, "invalid IPv4 address for multicast: %s",
addr);
return -1;
}
if (net_SetMcastOutIPv4 (fd, ipv4) == 0)
return 0;
msg_Err (p_this, "%s: %m", addr);
}
}
return -1;
}
/**
* Old-style any-source multicast join.
* In use on Windows XP/2003 and older.
*/
static int
net_IPv4Join (vlc_object_t *obj, int fd,
const struct sockaddr_in *src, const struct sockaddr_in *grp)
{
#ifdef IP_ADD_MEMBERSHIP
union
{
struct ip_mreq gr4;
# ifdef IP_ADD_SOURCE_MEMBERSHIP
struct ip_mreq_source gsr4;
# endif
} opt;
int cmd;
struct in_addr id = { .s_addr = INADDR_ANY };
socklen_t optlen;
/* Multicast interface IPv4 address */
char *iface = var_CreateGetNonEmptyString (obj, "miface-addr");
if ((iface != NULL)
&& (inet_pton (AF_INET, iface, &id) <= 0))
{
msg_Err (obj, "invalid multicast interface address %s", iface);
free (iface);
goto error;
}
free (iface);
memset (&opt, 0, sizeof (opt));
if (src != NULL)
{
# ifdef IP_ADD_SOURCE_MEMBERSHIP
cmd = IP_ADD_SOURCE_MEMBERSHIP;
opt.gsr4.imr_multiaddr = grp->sin_addr;
opt.gsr4.imr_sourceaddr = src->sin_addr;
opt.gsr4.imr_interface = id;
optlen = sizeof (opt.gsr4);
# else
errno = ENOSYS;
goto error;
# endif
}
else
{
cmd = IP_ADD_MEMBERSHIP;
opt.gr4.imr_multiaddr = grp->sin_addr;
opt.gr4.imr_interface = id;
optlen = sizeof (opt.gr4);
}
msg_Dbg (obj, "IP_ADD_%sMEMBERSHIP multicast request",
(src != NULL) ? "SOURCE_" : "");
if (setsockopt (fd, SOL_IP, cmd, &opt, optlen) == 0)
return 0;
error:
#endif
msg_Err (obj, "cannot join IPv4 multicast group (%m)");
return -1;
}
static int
net_IPv6Join (vlc_object_t *obj, int fd, const struct sockaddr_in6 *src)
{
#ifdef IPV6_JOIN_GROUP
struct ipv6_mreq gr6;
memset (&gr6, 0, sizeof (gr6));
gr6.ipv6mr_interface = src->sin6_scope_id;
memcpy (&gr6.ipv6mr_multiaddr, &src->sin6_addr, 16);
msg_Dbg (obj, "IPV6_JOIN_GROUP multicast request");
if (!setsockopt (fd, SOL_IPV6, IPV6_JOIN_GROUP, &gr6, sizeof (gr6)))
return 0;
#else
errno = ENOSYS;
#endif
msg_Err (obj, "cannot join IPv6 any-source multicast group (%m)");
return -1;
}
#if defined (WIN32) && !defined (MCAST_JOIN_SOURCE_GROUP)
/*
* I hate manual definitions: Error-prone. Portability hell.
* Developers shall use UP-TO-DATE compilers. Full point.
* If you remove the warning, you remove the whole ifndef.
*/
# warning Your C headers are out-of-date. Please update.
# define MCAST_JOIN_GROUP 41
struct group_req
{
ULONG gr_interface;
struct sockaddr_storage gr_group;
};
# define MCAST_JOIN_SOURCE_GROUP 45 /* from <ws2ipdef.h> */
struct group_source_req
{
uint32_t gsr_interface;
struct sockaddr_storage gsr_group;
struct sockaddr_storage gsr_source;
};
#endif
/**
* IP-agnostic multicast join,
* with fallback to old APIs, and fallback from SSM to ASM.
*/
static int
net_SourceSubscribe (vlc_object_t *obj, int fd,
const struct sockaddr *src, socklen_t srclen,
const struct sockaddr *grp, socklen_t grplen)
{
int level, iid = 0;
char *iface = var_CreateGetNonEmptyString (obj, "miface");
if (iface != NULL)
{
iid = if_nametoindex (iface);
if (iid == 0)
{
msg_Err (obj, "invalid multicast interface: %s", iface);
free (iface);
return -1;
}
free (iface);
}
switch (grp->sa_family)
{
#ifdef AF_INET6
case AF_INET6:
level = SOL_IPV6;
if (((const struct sockaddr_in6 *)grp)->sin6_scope_id)
iid = ((const struct sockaddr_in6 *)grp)->sin6_scope_id;
break;
#endif
case AF_INET:
level = SOL_IP;
break;
default:
errno = EAFNOSUPPORT;
return -1;
}
if (src != NULL)
switch (src->sa_family)
{
#ifdef AF_INET6
case AF_INET6:
if (memcmp (&((const struct sockaddr_in6 *)src)->sin6_addr,
&in6addr_any, sizeof (in6addr_any)) == 0)
src = NULL;
break;
#endif
case AF_INET:
if (((const struct sockaddr_in *)src)->sin_addr.s_addr
== INADDR_ANY)
src = NULL;
break;
}
/* Agnostic ASM/SSM multicast join */
#ifdef MCAST_JOIN_SOURCE_GROUP
union
{
struct group_req gr;
struct group_source_req gsr;
} opt;
socklen_t optlen;
memset (&opt, 0, sizeof (opt));
if (src != NULL)
{
if ((grplen > sizeof (opt.gsr.gsr_group))
|| (srclen > sizeof (opt.gsr.gsr_source)))
return -1;
opt.gsr.gsr_interface = iid;
memcpy (&opt.gsr.gsr_source, src, srclen);
memcpy (&opt.gsr.gsr_group, grp, grplen);
optlen = sizeof (opt.gsr);
}
else
{
if (grplen > sizeof (opt.gr.gr_group))
return -1;
opt.gr.gr_interface = iid;
memcpy (&opt.gr.gr_group, grp, grplen);
optlen = sizeof (opt.gr);
}
msg_Dbg (obj, "Multicast %sgroup join request", src ? "source " : "");
if (setsockopt (fd, level,
src ? MCAST_JOIN_SOURCE_GROUP : MCAST_JOIN_GROUP,
(void *)&opt, optlen) == 0)
return 0;
#endif
/* Fallback to IPv-specific APIs */
if ((src != NULL) && (src->sa_family != grp->sa_family))
return -1;
switch (grp->sa_family)
{
case AF_INET:
if ((grplen < sizeof (struct sockaddr_in))
|| ((src != NULL) && (srclen < sizeof (struct sockaddr_in))))
return -1;
if (net_IPv4Join (obj, fd, (const struct sockaddr_in *)src,
(const struct sockaddr_in *)grp) == 0)
return 0;
break;
#ifdef AF_INET6
case AF_INET6:
if ((grplen < sizeof (struct sockaddr_in6))
|| ((src != NULL) && (srclen < sizeof (struct sockaddr_in6))))
return -1;
/* IPv6-specific SSM API does not exist. So if we're here
* it means IPv6 SSM is not supported on this OS and we
* directly fallback to ASM */
if (net_IPv6Join (obj, fd, (const struct sockaddr_in6 *)grp) == 0)
return 0;
break;
#endif
}
msg_Err (obj, "Multicast group join error (%m)");
if (src != NULL)
{
msg_Warn (obj, "Trying ASM instead of SSM...");
return net_Subscribe (obj, fd, grp, grplen);
}
msg_Err (obj, "Multicast not supported");
return -1;
}
int net_Subscribe (vlc_object_t *obj, int fd,
const struct sockaddr *addr, socklen_t addrlen)
{
return net_SourceSubscribe (obj, fd, NULL, 0, addr, addrlen);
}
static int net_SetDSCP( int fd, uint8_t dscp )
{
struct sockaddr_storage addr;
if( getsockname( fd, (struct sockaddr *)&addr, &(socklen_t){ sizeof (addr) }) )
return -1;
int level, cmd;
switch( addr.ss_family )
{
#ifdef IPV6_TCLASS
case AF_INET6:
level = SOL_IPV6;
cmd = IPV6_TCLASS;
break;
#endif
case AF_INET:
level = SOL_IP;
cmd = IP_TOS;
break;
default:
#ifdef ENOPROTOOPT
errno = ENOPROTOOPT;
#endif
return -1;
}
return setsockopt( fd, level, cmd, &(int){ dscp }, sizeof (int));
}
/*****************************************************************************
* __net_ConnectDgram:
*****************************************************************************
* Open a datagram socket to send data to a defined destination, with an
* optional hop limit.
*****************************************************************************/
int __net_ConnectDgram( vlc_object_t *p_this, const char *psz_host, int i_port,
int i_hlim, int proto )
{
struct addrinfo hints, *res, *ptr;
int i_val, i_handle = -1;
bool b_unreach = false;
if( i_hlim < 1 )
i_hlim = var_CreateGetInteger( p_this, "ttl" );
memset( &hints, 0, sizeof( hints ) );
hints.ai_socktype = SOCK_DGRAM;
msg_Dbg( p_this, "net: connecting to [%s]:%d", psz_host, i_port );
i_val = vlc_getaddrinfo( p_this, psz_host, i_port, &hints, &res );
if( i_val )
{
msg_Err( p_this, "cannot resolve [%s]:%d : %s", psz_host, i_port,
vlc_gai_strerror( i_val ) );
return -1;
}
for( ptr = res; ptr != NULL; ptr = ptr->ai_next )
{
char *str;
int fd = net_Socket (p_this, ptr->ai_family, ptr->ai_socktype,
proto ?: ptr->ai_protocol);
if (fd == -1)
continue;
#if !defined( SYS_BEOS )
/* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s)
* to avoid packet loss caused by scheduling problems */
setsockopt (fd, SOL_SOCKET, SO_RCVBUF, &(int){ 0x80000 }, sizeof (int));
setsockopt (fd, SOL_SOCKET, SO_SNDBUF, &(int){ 0x80000 }, sizeof (int));
/* Allow broadcast sending */
setsockopt (fd, SOL_SOCKET, SO_BROADCAST, &(int){ 1 }, sizeof (int));
#endif
if( i_hlim > 0 )
net_SetMcastHopLimit( p_this, fd, ptr->ai_family, i_hlim );
str = var_CreateGetNonEmptyString (p_this, "miface");
if (str != NULL)
{
net_SetMcastOut (p_this, fd, ptr->ai_family, str, NULL);
free (str);
}
str = var_CreateGetNonEmptyString (p_this, "miface-addr");
if (str != NULL)
{
net_SetMcastOut (p_this, fd, ptr->ai_family, NULL, str);
free (str);
}
net_SetDSCP (fd, var_CreateGetInteger (p_this, "dscp"));
if( connect( fd, ptr->ai_addr, ptr->ai_addrlen ) == 0 )
{
/* success */
i_handle = fd;
break;
}
#if defined( WIN32 ) || defined( UNDER_CE )
if( WSAGetLastError () == WSAENETUNREACH )
#else
if( errno == ENETUNREACH )
#endif
b_unreach = true;
else
{
msg_Warn( p_this, "%s port %d : %m", psz_host, i_port);
net_Close( fd );
continue;
}
}
vlc_freeaddrinfo( res );
if( i_handle == -1 )
{
if( b_unreach )
msg_Err( p_this, "Host %s port %d is unreachable", psz_host,
i_port );
return -1;
}
return i_handle;
}
/*****************************************************************************
* __net_OpenDgram:
*****************************************************************************
* OpenDgram a datagram socket and return a handle
*****************************************************************************/
int __net_OpenDgram( vlc_object_t *obj, const char *psz_bind, int i_bind,
const char *psz_server, int i_server,
int family, int protocol )
{
if ((psz_server == NULL) || (psz_server[0] == '\0'))
return net_ListenSingle (obj, psz_bind, i_bind, family, protocol);
msg_Dbg (obj, "net: connecting to [%s]:%d from [%s]:%d",
psz_server, i_server, psz_bind, i_bind);
struct addrinfo hints, *loc, *rem;
int val;
memset (&hints, 0, sizeof (hints));
hints.ai_family = family;
hints.ai_socktype = SOCK_DGRAM;
val = vlc_getaddrinfo (obj, psz_server, i_server, &hints, &rem);
if (val)
{
msg_Err (obj, "cannot resolve %s port %d : %s", psz_bind, i_bind,
vlc_gai_strerror (val));
return -1;
}
hints.ai_flags = AI_PASSIVE;
val = vlc_getaddrinfo (obj, psz_bind, i_bind, &hints, &loc);
if (val)
{
msg_Err (obj, "cannot resolve %s port %d : %s", psz_bind, i_bind,
vlc_gai_strerror (val));
vlc_freeaddrinfo (rem);
return -1;
}
for (struct addrinfo *ptr = loc; ptr != NULL; ptr = ptr->ai_next)
{
int fd = net_Socket (obj, ptr->ai_family, ptr->ai_socktype,
protocol ?: ptr->ai_protocol);
if (fd == -1)
continue; // usually, address family not supported
#ifdef SO_REUSEPORT
setsockopt (fd, SOL_SOCKET, SO_REUSEPORT, &(int){ 1 }, sizeof (int));
#endif
#ifdef SO_RCVBUF
/* Increase the receive buffer size to 1/2MB (8Mb/s during 1/2s)
* to avoid packet loss caused in case of scheduling hiccups */
setsockopt (fd, SOL_SOCKET, SO_RCVBUF,
(void *)&(int){ 0x80000 }, sizeof (int));
setsockopt (fd, SOL_SOCKET, SO_SNDBUF,
(void *)&(int){ 0x80000 }, sizeof (int));
#endif
#if defined (WIN32) || defined (UNDER_CE)
if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
&& (sizeof (struct sockaddr_storage) >= ptr->ai_addrlen))
{
// This works for IPv4 too - don't worry!
struct sockaddr_in6 dumb =
{
.sin6_family = ptr->ai_addr->sa_family,
.sin6_port = ((struct sockaddr_in *)(ptr->ai_addr))->sin_port
};
bind (fd, (struct sockaddr *)&dumb, ptr->ai_addrlen);
}
else
#endif
if (bind (fd, ptr->ai_addr, ptr->ai_addrlen))
{
net_Close (fd);
continue;
}
val = -1;
for (struct addrinfo *ptr2 = rem; ptr2 != NULL; ptr2 = ptr2->ai_next)
{
if ((ptr2->ai_family != ptr->ai_family)
|| (ptr2->ai_socktype != ptr->ai_socktype)
|| (ptr2->ai_protocol != ptr->ai_protocol))
continue;
if (net_SockAddrIsMulticast (ptr->ai_addr, ptr->ai_addrlen)
? net_SourceSubscribe (obj, fd,
ptr2->ai_addr, ptr2->ai_addrlen,
ptr->ai_addr, ptr->ai_addrlen)
: connect (fd, ptr2->ai_addr, ptr2->ai_addrlen))
{
msg_Err (obj, "cannot connect to %s port %d: %m",
psz_server, i_server);
continue;
}
val = fd;
break;
}
if (val != -1)
break;
close (fd);
}
vlc_freeaddrinfo (rem);
vlc_freeaddrinfo (loc);
return val;
}
/**
* net_SetCSCov:
* Sets the send and receive checksum coverage of a socket:
* @param fd socket
* @param sendcov payload coverage of sent packets (bytes), -1 for full
* @param recvcov minimum payload coverage of received packets, -1 for full
*/
int net_SetCSCov (int fd, int sendcov, int recvcov)
{
int type;
if (getsockopt (fd, SOL_SOCKET, SO_TYPE,
&type, &(socklen_t){ sizeof (type) }))
return VLC_EGENERIC;
switch (type)
{
#ifdef UDPLITE_RECV_CSCOV
case SOCK_DGRAM: /* UDP-Lite */
if (sendcov == -1)
sendcov = 0;
else
sendcov += 8; /* partial */
if (setsockopt (fd, SOL_UDPLITE, UDPLITE_SEND_CSCOV, &sendcov,
sizeof (sendcov)))
return VLC_EGENERIC;
if (recvcov == -1)
recvcov = 0;
else
recvcov += 8;
if (setsockopt (fd, SOL_UDPLITE, UDPLITE_RECV_CSCOV,
&recvcov, sizeof (recvcov)))
return VLC_EGENERIC;
return VLC_SUCCESS;
#endif
#ifdef DCCP_SOCKOPT_SEND_CSCOV
case SOCK_DCCP: /* DCCP and its ill-named socket type */
if ((sendcov == -1) || (sendcov > 56))
sendcov = 0;
else
sendcov = (sendcov + 3) / 4;
if (setsockopt (fd, SOL_DCCP, DCCP_SOCKOPT_SEND_CSCOV,
&sendcov, sizeof (sendcov)))
return VLC_EGENERIC;
if ((recvcov == -1) || (recvcov > 56))
recvcov = 0;
else
recvcov = (recvcov + 3) / 4;
if (setsockopt (fd, SOL_DCCP, DCCP_SOCKOPT_RECV_CSCOV,
&recvcov, sizeof (recvcov)))
return VLC_EGENERIC;
return VLC_SUCCESS;
#endif
}
#if !defined( UDPLITE_RECV_CSCOV ) && !defined( DCCP_SOCKOPT_SEND_CSCOV )
VLC_UNUSED(sendcov);
VLC_UNUSED(recvcov);
#endif
return VLC_EGENERIC;
}
