void UDPListener(object state)
{
//TODO make UDP port paramater from command line
Socket remoteHosts;
IPEndPoint iep;
EndPoint ep;
List <string> remoteIpList = new List <string>();
try
{
remoteHosts = new Socket(AddressFamily.InterNetwork,
SocketType.Dgram, ProtocolType.Udp);
remoteHosts.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
iep = new IPEndPoint(IPAddress.Any, _hParams.UDPPort.ToInt());
ep = (EndPoint)iep;
remoteHosts.Bind(iep);
remoteHosts.ReceiveTimeout = 5000;
}
catch { return; }
while (_isRunning)
{
string remoteIp = "";
byte[] data = new byte[1024];
int recv = 0;
try
{
recv = remoteHosts.ReceiveFrom(data, ref ep);
if (ep.AddressFamily == AddressFamily.InterNetwork)
{
remoteIp = ep.ToString();
}
else
{
remoteIp = "";
}
}
catch
{
recv = 0;
Thread.Sleep(1000);
remoteIpList.Clear();
}
// Code to stop double/triple udp packets.
// after 1 second the list will be wiped.
if (recv > 0 && remoteIpList.Contains(remoteIp))
{
recv = 0;
}
if (recv > 0)
{
remoteIpList.Add(remoteIp);
string stringData = Encoding.Default.GetString(data, 0, recv);
Console.WriteLine("Revieved Message from " + remoteIp);
Array.Resize(ref data, recv);
try
{
// Decode the message.
var requestMessage = new HMessage(data);
_udpLogging.LogData(data, "UDP Packet :- " + recv + "bytes");
string ip = requestMessage.FieldValues["IA"];
string port = requestMessage.FieldValues["IP"];
if (!requestMessage.isPartOfNetwork(_hParams.NetworkName))
{
Debug.WriteLine("Received Find IP Terminal Message, Ignoring Network Name different");
}
else
{
Debug.WriteLine("Received Find IP Terminal Message, Connecting back on TCP IP-" + ip + ":" +
port);
try
{
var ClientIP = IPAddress.Parse(ip);
int ClientIPPort;
if (!int.TryParse(port, out ClientIPPort))
{
throw new ArgumentOutOfRangeException();
}
//var terminalResponse = new HParams();
//terminalResponse.IPAddress = NetworkClass.getComputerIpAddress();
//terminalResponse.IPPort = _tcpPort.ToString();
var hMessage = HTerminal.getTerminalIPTestResponse(_hParams);
byte[] packetData = hMessage.SaveToByteArray();
_udpLogging.LogData(packetData, "Sending Find Terminal Test");
Debug.WriteLine("Waiting for Message...... Hit the ESC key to Exit");
try
{
using (var client = new TcpClient(ip, ClientIPPort))
{
using (NetworkStream stream = client.GetStream())
{
stream.Write(packetData, 0, packetData.Length);
stream.Close();
}
client.Close();
}
}
catch (ArgumentNullException e)
{
Debug.WriteLine(string.Format("ArgumentNullException: {0}", e));
}
catch (SocketException e)
{
Debug.WriteLine(string.Format("SocketException: {0}", e));
}
}
catch (Exception)
{
Debug.WriteLine("Error, Invalid IP and port combination" + ip + ":" +
port);
}
}
}
catch (Exception)
{
_udpLogging.LogData(data, "Bad/Invalid HC UDP Packet :- " + recv + "bytes");
}
}
}
}