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// System.Net.Sockets.TcpListener.cs
//
// Author:
// Phillip Pearson (pp@myelin.co.nz)
//
// Copyright (C) 2001, Phillip Pearson
// http://www.myelin.co.nz
//
// NB: This is untested (probably buggy) code - take care using it
using System;
using System.Net;
namespace System.Net.Sockets
{
/// <remarks>
/// A slightly more abstracted way to listen for incoming
/// network connections than a Socket.
/// </remarks>
public class TcpListener
{
// private data
private bool active;
private Socket server;
// constructor
/// <summary>
/// Some code that is shared between the constructors.
/// </summary>
private void Init ()
{
active = false;
server = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp);
}
/// <summary>
/// Constructs a new TcpListener to listen on a specified port
/// </summary>
/// <param name="port">The port to listen on, e.g. 80 if you
/// are a web server</param>
public TcpListener (int port)
{
Init();
server.Bind(new IPEndPoint(IPAddress.Any, port));
}
/// <summary>
/// Constructs a new TcpListener with a specified local endpoint
/// </summary>
/// <param name="local_end_point">The endpoint</param>
public TcpListener (IPEndPoint local_end_point)
{
Init();
server.Bind(local_end_point);
}
/// <summary>
/// Constructs a new TcpListener, listening on a specified port
/// and IP (for use on a multi-homed machine)
/// </summary>
/// <param name="listen_ip">The IP to listen on</param>
/// <param name="port">The port to listen on</param>
public TcpListener (IPAddress listen_ip, int port)
{
Init();
server.Bind(new IPEndPoint(listen_ip, port));
}
// properties
/// <summary>
/// A flag that is 'true' if the TcpListener is listening,
/// or 'false' if it is not listening
/// </summary>
protected bool Active
{
get { return active; }
}
/// <summary>
/// The local end point
/// </summary>
public EndPoint LocalEndpoint
{
get { return server.LocalEndPoint; }
}
/// <summary>
/// The listening socket
/// </summary>
protected Socket Server
{
get { return server; }
}
// methods
/// <summary>
/// Accepts a pending connection
/// <returns>A Socket object for the new connection</returns>
public Socket AcceptSocket ()
{
return server.Accept();
}
/// <summary>
/// Accepts a pending connection
/// </summary>
/// <returns>A TcpClient
/// object made from the new socket.</returns>
public TcpClient AcceptTcpClient ()
{
TcpClient client = new TcpClient();
// use internal method SetTcpClient to make a
// client with the specified socket
client.SetTcpClient(AcceptSocket());
return client;
}
/// <summary>
/// Destructor - stops the listener listening
/// </summary>
~TcpListener ()
{
if (active == true) {
Stop();
}
}
/// <returns>
/// Returns 'true' if there is a connection waiting to be accepted
/// with AcceptSocket() or AcceptTcpClient().
/// </returns>
public bool Pending ()
{
return server.Poll(1000, SelectMode.SelectRead);
}
/// <summary>
/// Tells the TcpListener to start listening.
/// </summary>
[MonoTODO]
public void Start ()
{
server.Listen(5); // According to the
// man page some BSD
// and BSD-derived
// systems limit the
// backlog to 5. This
// should really be
// configurable though
active = true;
}
/// <summary>
/// Tells the TcpListener to stop listening and dispose
/// of all managed resources.
/// </summary>
public void Stop ()
{
server.Close();
}
}
}
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