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TcpRw.cs
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TcpRw.cs
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/*
* Copyright (C) 2013 Pavel Charvat
*
* This file is part of IEDExplorer.
*
* IEDExplorer is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* IEDExplorer is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with IEDExplorer. If not, see <http://www.gnu.org/licenses/>.
*/
using System;
using System.Collections.Generic;
using System.Threading;
using System.Net;
using System.Net.Sockets;
namespace IEDExplorer
{
internal class TcpRw
{
public static void StartClient(TcpState tcps)
{
// Connect to a remote device.
try
{
// Establish the remote endpoint for the socket.
IPHostEntry ipHostInfo;
//if (tcps.hostname == "localhost" || tcps.hostname == "127.0.0.1")
//{
// ipHostInfo = Dns.GetHostEntry("");
//}
//else
IPAddress ipAddress = null;
if (!IPAddress.TryParse(tcps.hostname, out ipAddress))
{
ipHostInfo = Dns.GetHostEntry(tcps.hostname);
for (int i = 0; i < ipHostInfo.AddressList.Length; i++)
{
if (ipHostInfo.AddressList[i].AddressFamily == AddressFamily.InterNetwork)
{
ipAddress = ipHostInfo.AddressList[i];
break;
}
}
}
IPEndPoint remoteEP = new IPEndPoint(ipAddress, tcps.port);
// Create a TCP/IP socket.
tcps.workSocket = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp);
// KeepAlive`
if (tcps.keepalive_time > 0 && tcps.keepalive_interval > 0)
SetKeepAlive(tcps.workSocket, tcps.keepalive_time, tcps.keepalive_interval);
// Events reset
tcps.connectDone.Reset();
tcps.receiveDone.Reset();
tcps.sendDone.Reset();
// Connect to the remote endpoint.
tcps.workSocket.BeginConnect(remoteEP,
new AsyncCallback(ConnectCallback), tcps);
tcps.tstate = TcpProtocolState.TCP_CONNECT_WAIT;
}
catch (Exception e)
{
StopClient(tcps);
tcps.logger.LogError(e.ToString());
}
}
public static void StopClient(TcpState tcps)
{
// Connect to a remote device.
tcps.logger.LogInfo("StopClient: Socket shutdowned.");
try
{
tcps.tstate = TcpProtocolState.TCP_STATE_SHUTDOWN;
// Release the socket.
if (tcps.workSocket != null)
{
if (tcps.workSocket.Connected)
{
tcps.workSocket.Shutdown(SocketShutdown.Both);
tcps.receiveDone.WaitOne(15000);
}
tcps.workSocket.Close();
tcps.workSocket = null;
}
}
catch (Exception e)
{
tcps.logger.LogError("Closing: " + e.ToString());
}
}
private static void ConnectCallback(IAsyncResult ar)
{
// Retrieve the socket from the state object.
TcpState tcps = (TcpState)ar.AsyncState;
try
{
// Complete the connection.
tcps.workSocket.EndConnect(ar);
tcps.logger.LogInfo(String.Format("ConnectCallback: Socket connected to {0}",
tcps.workSocket.RemoteEndPoint.ToString()));
// Signal that the connection has been made.
tcps.tstate = TcpProtocolState.TCP_CONNECTED;
tcps.connectDone.Set();
}
catch (Exception e)
{
StopClient(tcps);
tcps.logger.LogError(e.ToString());
}
}
public static void Receive(TcpState tcps)
{
try
{
// Begin receiving the data from the remote device.
tcps.workSocket.BeginReceive(tcps.recvBuffer, 0, Iec61850State.recvBufferSize, 0,
new AsyncCallback(ReceiveCallback), tcps);
}
catch (Exception e)
{
StopClient(tcps);
tcps.logger.LogError(e.ToString());
}
}
private static void ReceiveCallback(IAsyncResult ar)
{
// Retrieve the socket from the state object.
TcpState tcps = (TcpState)ar.AsyncState;
//try
{
// Complete the connection.
if (tcps.workSocket != null)
{
tcps.recvBytes = tcps.workSocket.EndReceive(ar);
//Console.WriteLine("ReceiveCallback: Data received {0}",
// tcps.recvBytes.ToString());
Tpkt.Parse(tcps);
// Signal that the data has been received.
tcps.receiveDone.Set();
}
}
//catch (Exception e)
{
// StopClient(tcps);
// tcps.logger.LogInfo(e.ToString());
}
}
public static void Send(TcpState tcps) //Socket client, byte[] data)
{
// Begin sending the data to the remote device.
tcps.workSocket.BeginSend(tcps.sendBuffer, 0, tcps.sendBytes, 0,
new AsyncCallback(SendCallback), tcps);
}
private static void SendCallback(IAsyncResult ar)
{
TcpState tcps = (TcpState)ar.AsyncState;
try
{
// Retrieve the socket from the state object.
// Complete sending the data to the remote device.
int bytesSent = tcps.workSocket.EndSend(ar);
tcps.logger.LogDebug(String.Format("Sent {0} bytes to server.", bytesSent));
// Signal that all bytes have been sent.
tcps.sendDone.Set();
}
catch (Exception e)
{
tcps.logger.LogError(e.ToString());
}
}
/// <summary>
/// Sets socket to keepalive mode
/// </summary>
/// <param name="s">Socket</param>
/// <param name="keepalive_time">time</param>
/// <param name="keepalive_interval">interval</param>
public static void SetKeepAlive(Socket s, ulong keepalive_time, ulong keepalive_interval)
{
int bytes_per_long = 32 / 8;
byte[] keep_alive = new byte[3 * bytes_per_long];
ulong[] input_params = new ulong[3];
int i1;
int bits_per_byte = 8;
if (keepalive_time == 0 || keepalive_interval == 0)
input_params[0] = 0;
else
input_params[0] = 1;
input_params[1] = keepalive_time;
input_params[2] = keepalive_interval;
for (i1 = 0; i1 < input_params.Length; i1++)
{
keep_alive[i1 * bytes_per_long + 3] = (byte)(input_params[i1] >> ((bytes_per_long - 1) * bits_per_byte) & 0xff);
keep_alive[i1 * bytes_per_long + 2] = (byte)(input_params[i1] >> ((bytes_per_long - 2) * bits_per_byte) & 0xff);
keep_alive[i1 * bytes_per_long + 1] = (byte)(input_params[i1] >> ((bytes_per_long - 3) * bits_per_byte) & 0xff);
keep_alive[i1 * bytes_per_long + 0] = (byte)(input_params[i1] >> ((bytes_per_long - 4) * bits_per_byte) & 0xff);
}
s.IOControl(IOControlCode.KeepAliveValues, keep_alive, null);
} /* method AsyncSocket SetKeepAlive */
}
}