/*
========================
Net_SendUDPPacket
========================
*/
void Net_SendUDPPacket( int netSocket, int length, const void* data, const netadr_t to )
{
int ret;
sockaddr_in addr;
if( !netSocket )
{
return;
}
Net_NetadrToSockadr( &to, &addr );
if( usingSocks && to.type == NA_IP )
{
socksBuf[0] = 0; // reserved
socksBuf[1] = 0;
socksBuf[2] = 0; // fragment (not fragmented)
socksBuf[3] = 1; // address type: IPV4
*( int* )&socksBuf[4] = addr.sin_addr.s_addr;
*( short* )&socksBuf[8] = addr.sin_port;
memcpy( &socksBuf[10], data, length );
ret = sendto( netSocket, socksBuf, length + 10, 0, ( sockaddr* )&socksRelayAddr, sizeof( socksRelayAddr ) );
}
else
{
ret = sendto( netSocket, ( const char* )data, length, 0, ( sockaddr* )&addr, sizeof( addr ) );
}
if( ret == SOCKET_ERROR )
{
int err = Net_GetLastError();
// some PPP links do not allow broadcasts and return an error
if( ( err == D3_NET_EADDRNOTAVAIL ) && ( to.type == NA_BROADCAST ) )
{
return;
}
// NOTE: EWOULDBLOCK used to be silently ignored,
// but that means the packet will be dropped so I don't feel it's a good thing to ignore
idLib::Printf( "UDP sendto error - packet dropped: %s\n", NET_ErrorString() );
}
}
bool SocketIsReady( SOCKET sock )
{
timeval tv;
fd_set mask;
bool ready = false;
do
{
Net_SetLastError( 0 );
FD_ZERO( &mask );
FD_SET( sock, &mask );
tv.tv_sec = 0;
tv.tv_usec = 0;
ready = select( sock + 1, &mask, 0, 0, &tv ) == 1;
} while ( Net_GetLastError() == EINTR );
return ready;
}
/*
========================
Net_GetUDPPacket
========================
*/
bool Net_GetUDPPacket( int netSocket, netadr_t& net_from, char* data, int& size, int maxSize )
{
int ret;
sockaddr_in from;
socklen_t fromlen;
int err;
if( !netSocket )
{
return false;
}
fromlen = sizeof( from );
ret = recvfrom( netSocket, data, maxSize, 0, ( sockaddr* )&from, &fromlen );
if( ret == SOCKET_ERROR )
{
err = Net_GetLastError();
if( err == D3_NET_EWOULDBLOCK || err == D3_NET_ECONNRESET )
{
return false;
}
idLib::Printf( "Net_GetUDPPacket: %s\n", NET_ErrorString() );
return false;
}
#if 0
// TODO: WTF was this about?
// DG: ip_socket is never initialized, so this is dead code
// - and if netSocket is 0 (so this would be true) recvfrom above will already fail
if( static_cast<unsigned int>( netSocket ) == ip_socket )
{
memset( from.sin_zero, 0, sizeof( from.sin_zero ) );
}
if( usingSocks && static_cast<unsigned int>( netSocket ) == ip_socket && memcmp( &from, &socksRelayAddr, fromlen ) == 0 )
{
if( ret < 10 || data[0] != 0 || data[1] != 0 || data[2] != 0 || data[3] != 1 )
{
return false;
}
net_from.type = NA_IP;
net_from.ip[0] = data[4];
net_from.ip[1] = data[5];
net_from.ip[2] = data[6];
net_from.ip[3] = data[7];
net_from.port = *( short* )&data[8];
memmove( data, &data[10], ret - 10 );
}
else
{
#endif // 0
Net_SockadrToNetadr( &from, &net_from );
#if 0 // this is ugly, but else astyle is confused
}
#endif
if( ret > maxSize )
{
idLib::Printf( "Net_GetUDPPacket: oversize packet from %s\n", Sys_NetAdrToString( net_from ) );
return false;
}
size = ret;
return true;
}
