private void SendCommand(NetworkStream nStream, byte command, string destinationHost, int destinationPort)
{
byte aTyp = GetAddressType(destinationHost);
byte[] dstAddr = HostHelper.GetHostAddressBytes(aTyp, destinationHost);
byte[] dstPort = HostHelper.GetPortBytes(destinationPort);
// +----+-----+-------+------+----------+----------+
// |VER | CMD | RSV | ATYP | DST.ADDR | DST.PORT |
// +----+-----+-------+------+----------+----------+
// | 1 | 1 | X'00' | 1 | Variable | 2 |
// +----+-----+-------+------+----------+----------+
byte[] request = new byte[4 + dstAddr.Length + 2];
request[0] = VersionNumber;
request[1] = command;
request[2] = Reserved;
request[3] = aTyp;
dstAddr.CopyTo(request, 4);
dstPort.CopyTo(request, 4 + dstAddr.Length);
nStream.Write(request, 0, request.Length);
// +----+-----+-------+------+----------+----------+
// |VER | REP | RSV | ATYP | BND.ADDR | BND.PORT |
// +----+-----+-------+------+----------+----------+
// | 1 | 1 | X'00' | 1 | Variable | 2 |
// +----+-----+-------+------+----------+----------+
byte[] response = new byte[255];
nStream.Read(response, 0, response.Length);
byte reply = response[1];
if (reply != CommandReplySucceeded)
{
HandleCommandError(reply);
}
}