SNMP listener

snmplistener.cs

// Prototype server for SNMP

Socket socket;
        EndPoint ep;
        byte[] buffer;
        ManualResetEvent manualevent = new ManualResetEvent(false);

        private void btnListener_Click(object sender, RoutedEventArgs e)
        {
            // Construct a socket and bind it to the trap manager port 162
            socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
            IPEndPoint ipep = new IPEndPoint(IPAddress.Any, 162);
            ep = (EndPoint)ipep;
            socket.Bind(ep);
            // Disable timeout processing. Just block until packet is received
            buffer = new byte[64 * 1024];

            Thread listener = new Thread(Listener);
            listener.Start();
        }


        private void Listener()
        {
            while (true) {
                manualevent.Reset();            
                socket.BeginReceiveFrom(buffer, 0, 64 * 1024, SocketFlags.None, ref ep, new AsyncCallback(RecieveTrap), socket);
                manualevent.WaitOne();
            }
        }

        private void RecieveTrap(IAsyncResult result)
        {
            Socket sock = (Socket)result.AsyncState;
            IPEndPoint _peerIP = new IPEndPoint(IPAddress.Any, 0);
            // variable to store received data length
            int inlen = -1;
            try
            {
                EndPoint ep = (EndPoint)_peerIP;
                inlen = sock.EndReceiveFrom(result, ref ep);
                _peerIP = (IPEndPoint)ep;
            }
            catch (Exception ex)
            {
                return;
            }

            if (inlen >= 0)
            {
                int packetVersion = SnmpPacket.GetProtocolVersion(buffer, inlen);
                manualevent.Set();
                SetLog dlg_Log = new SetLog(Log);
                this.Dispatcher.Invoke(dlg_Log, "listener", packetVersion.ToString());
            }
                


        }