private void SendHeartbeat(string remoteIp, int remotePort)
{
lock (_hbMutex)
{
if (_hbMutex.IsHeld())
{
//Logger.Info(string.Format("TunnelId={0} TunnelName={1} Message=\"Heartbeat has already been sent to {2}:{3} in the last {4} seconds. Aborting.\"", GetId(), FriendlyName, remoteIp, remotePort, HeartbeatTimeout / 1000));
return;
}
Logger.Info(string.Format("TunnelId={0} TunnelName={1} Message=\"Locking available mutex to send heartbeat to remote client {2}:{3}\"", GetId(), FriendlyName, remoteIp, remotePort));
_hbMutex.Hold();
}
var tmpBuffer = Buffer.New();
Buffer.ClearBuffer(tmpBuffer);
Buffer.FinalizeBuffer(tmpBuffer);
SockLib.SendMessage(_socket, remoteIp, remotePort, tmpBuffer);
Thread.Sleep(HeartbeatTimeout);
lock (_hbMutex)
{
Logger.Info(string.Format("TunnelId={0} TunnelName={1} Message=\"Releasing mutex for heartbeat\"", GetId(), FriendlyName));
_hbMutex.Release();
}
}
public Tunnel(IMessageHandler messageHandler, string friendlyName = "Cactus Fantastico", int port = 14804)
{
MessageHandler = messageHandler;
FriendlyName = friendlyName;
_socket = SockLib.UdpConnect(port);
_messageQueue = new ConcurrentQueue <Message>();
_hbMutex = new SimpleMutex();
_id = _tunnelCounter++;
}
private void TunnelSendThread(string remoteIp, int remotePort)
{
while (true)
{
var message = DequeueMessage();
if (message == null)
{
new Thread(() => SendHeartbeat(remoteIp, remotePort)).Run();
continue;
}
Buffer.ClearBuffer(_sendBuffer);
Buffer.Add(_sendBuffer, message);
Buffer.FinalizeBuffer(_sendBuffer);
SockLib.SendMessage(_socket, remoteIp, remotePort, _sendBuffer);
}
}
public void MessageReceiveThread()
{
var exitFlag = false;
while (exitFlag == false)
{
if (SockLib.BytesAvailable(_recvSocket) > 0)
{
if (SockLib.ReceiveMessage(_recvSocket, _recvBuffer) > 0)
{
//TODO: Apparently, you cannot get ip and/or port address of a udp socket... need to write values to payload...
//var remoteIp = SockLib.GetRemoteIpAddress(_recvSocket);
//var remotePort = SockLib.GetRemotePort(_recvSocket);
Buffer.FinalizeBuffer(_recvBuffer);
MessageRecieved(new KeyValuePair <string, int>("127.0.0.1", 1025), Buffer.GetBuffer(_recvBuffer));
}
}
}
//RecvThreadDeathNotification();
}
private static Socket CreateSocket()
{
const int minPort = 1025;
const int maxPort = 65535;
var currentPort = minPort;
do
{
try
{
Logger.DebugFormat("Attempting to bind to local port {0}", currentPort);
return(SockLib.UdpConnect(currentPort));
}
catch (Exception)
{
Logger.DebugFormat("Failed to bind to port {0}", currentPort);
currentPort++;
}
} while (currentPort <= maxPort);
const string message = "Failed to bind to any local ports. Check your firewall.";
Logger.Error(message);
throw new IOException(message);
}
