public static void OpenTunnelPingListener()
{
if (TunnelValidatorRunning)
{
CloseTunnelPingListener();
}
ServiceSettings serviceSettings = SettingsHelper.GetSettings();
if (TunnelHelper.CurrentTunnelStatus == TunnelStatuses.Started && serviceSettings.EnableTunnelValidation)
{
TunnelPingHelper.TunnelValidatorLastPingSuccessful = false;
_validationListener = new TcpListener(IPAddress.Any, serviceSettings.TunnelValidationRemotePort);
Task.Factory.StartNew(() =>
{
TunnelPingHelper.TunnelValidatorRunning = true;
_validationListener.Start();
try
{
while (true)
{
TcpClient tcpClient;
try
{
tcpClient = _validationListener.AcceptTcpClient();
}
catch (SocketException ex)
{
if (ex.SocketErrorCode == SocketError.Interrupted)
{
TunnelPingHelper.TunnelValidatorRunning = false;
break;
}
else
{
throw;
}
}
Task.Factory.StartNew(() =>
{
try
{
NetworkStream clientStream = tcpClient.GetStream();
byte[] message = new byte[32];
string validationString = "";
while (true)
{
int bytesRead = clientStream.Read(message, 0, 32);
if (bytesRead == 0)
{
break;
}
ASCIIEncoding encoding = new ASCIIEncoding();
string str = encoding.GetString(message, 0, bytesRead);
validationString += str;
if (validationString == "-111-")
{
const string sendString = "-222-";
byte[] sendData = Encoding.ASCII.GetBytes(sendString);
clientStream.Write(sendData, 0, sendData.Length);
break;
}
else if (validationString.Length > 5)
{
break;
}
}
tcpClient.Close();
}
catch (Exception ex)
{
WcfServerHelper.BroadcastRemoteCallback((x) => x.EventToLog("Tunnel Validation Exception (1): " + ex.Message + " ::: " + ex.StackTrace, DateTime.Now));
HandleFailedTunnelPing();
}
});
}
}
catch (Exception ex)
{
WcfServerHelper.BroadcastRemoteCallback((x) => x.EventToLog("Tunnel Validation Exception (2): " + ex.Message + " ::: " + ex.StackTrace, DateTime.Now));
HandleFailedTunnelPing();
}
}, TaskCreationOptions.LongRunning);
_pingTunnelTimer = new System.Timers.Timer();
_pingTunnelTimer.Interval = serviceSettings.TunnelValidationPingInterval * 1000;
_pingTunnelTimer.AutoReset = true;
_pingTunnelTimer.Elapsed += _pingTunnelTimer_Elapsed;
Thread.Sleep(1200);
SendTunnelPing();
_pingTunnelTimer.Start();
}
}