public static NatNegMessage ParseData(byte[] bytes)
{
if (bytes.Length < 8)
{
return(null);
}
if (bytes[0] != 0xFD || bytes[1] != 0xFC)
{
return(null);
}
NatNegMessage msg = new NatNegMessage();
msg.Constant = _toInt(_getBytes(bytes, 2, 4));
msg.ProtocolVersion = bytes[6];
msg.RecordType = bytes[7];
if (bytes.Length > 8)
{
msg.RecordSpecificData = _getBytes(bytes, 8, bytes.Length - 8);
}
if (msg.RecordType == 0)
{
// INIT
msg.ClientId = _toInt(_getBytes(msg.RecordSpecificData, 0, 4));
msg.SequenceId = msg.RecordSpecificData[4];
msg.Hoststate = msg.RecordSpecificData[5];
msg.UseGamePort = msg.RecordSpecificData[6];
msg.PrivateIPAddress = _toIpAddress(_getBytes(msg.RecordSpecificData, 7, 4));
msg.LocalPort = _toShort(_getBytes(msg.RecordSpecificData, 11, 2));
msg.GameName = _toString(_getBytes(msg.RecordSpecificData, 13, msg.RecordSpecificData.Length - 13));
}
else if (msg.RecordType == 6)
{
// CONNECT_ACK
msg.ClientId = _toInt(_getBytes(msg.RecordSpecificData, 0, 4));
msg.PortType = msg.RecordSpecificData[4];
msg.ReplyFlag = msg.RecordSpecificData[5];
msg.ConnectAckUnknown2 = _toShort(_getBytes(msg.RecordSpecificData, 6, 2));
msg.ConnectAckUnknown3 = msg.RecordSpecificData[8];
msg.ConnectAckUnknown4 = _toInt(_getBytes(msg.RecordSpecificData, 9, 4));
}
else if (msg.RecordType == 13)
{
// CONNECT_ACK
msg.ClientId = _toInt(_getBytes(msg.RecordSpecificData, 0, 4));
msg.PortType = msg.RecordSpecificData[4];
msg.Hoststate = msg.RecordSpecificData[5];
msg.NatNegResult = msg.RecordSpecificData[6];
msg.NatType = _toIntBigEndian(_getBytes(msg.RecordSpecificData, 7, 4));
msg.NatMappingScheme = _toIntBigEndian(_getBytes(msg.RecordSpecificData, 11, 4));
msg.GameName = _toString(_getBytes(msg.RecordSpecificData, 15, msg.RecordSpecificData.Length - 15));
}
return(msg);
}
public static NatNegMessage ParseData(byte[] bytes)
{
if (bytes.Length < 8) return null;
if (bytes[0] != 0xFD || bytes[1] != 0xFC) return null;
NatNegMessage msg = new NatNegMessage();
msg.Constant = _toInt(_getBytes(bytes, 2, 4));
msg.ProtocolVersion = bytes[6];
msg.RecordType = bytes[7];
if (bytes.Length > 8) msg.RecordSpecificData = _getBytes(bytes, 8, bytes.Length - 8);
if (msg.RecordType == 0)
{
// INIT
msg.ClientId = _toInt(_getBytes(msg.RecordSpecificData, 0, 4));
msg.SequenceId = msg.RecordSpecificData[4];
msg.Hoststate = msg.RecordSpecificData[5];
msg.UseGamePort = msg.RecordSpecificData[6];
msg.PrivateIPAddress = _toIpAddress(_getBytes(msg.RecordSpecificData, 7, 4));
msg.LocalPort = _toShort(_getBytes(msg.RecordSpecificData, 11, 2));
msg.GameName = _toString(_getBytes(msg.RecordSpecificData, 13, msg.RecordSpecificData.Length-13));
}
else if (msg.RecordType == 6)
{
// CONNECT_ACK
msg.ClientId = _toInt(_getBytes(msg.RecordSpecificData, 0, 4));
msg.PortType = msg.RecordSpecificData[4];
msg.ReplyFlag = msg.RecordSpecificData[5];
msg.ConnectAckUnknown2 = _toShort(_getBytes(msg.RecordSpecificData, 6, 2));
msg.ConnectAckUnknown3 = msg.RecordSpecificData[8];
msg.ConnectAckUnknown4 = _toInt(_getBytes(msg.RecordSpecificData, 9, 4));
}
else if (msg.RecordType == 13)
{
// CONNECT_ACK
msg.ClientId = _toInt(_getBytes(msg.RecordSpecificData, 0, 4));
msg.PortType = msg.RecordSpecificData[4];
msg.Hoststate = msg.RecordSpecificData[5];
msg.NatNegResult = msg.RecordSpecificData[6];
msg.NatType = _toIntBigEndian(_getBytes(msg.RecordSpecificData, 7, 4));
msg.NatMappingScheme = _toIntBigEndian(_getBytes(msg.RecordSpecificData, 11, 4));
msg.GameName = _toString(_getBytes(msg.RecordSpecificData, 15, msg.RecordSpecificData.Length - 15));
}
return msg;
}
private void SendResponse(IPEndPoint remote, NatNegMessage message)
{
byte[] response = message.ToBytes();
Log(Category, "Sending response " + message.ToString() + " to " + remote.ToString());
Log(Category, "(Response bytes: " + string.Join(" ", response.Select((b) => { return b.ToString("X2"); }).ToArray()) + ")");
_socket.SendTo(response, remote);
}
