Internet Magic (Proxy Server) Windows Application

using System;
using System.Net;
using System.Net.Sockets;
using internet_magic;
using internet_magic.Socks.Authentication;

namespace internet_magic.Socks {

///<summary>Listens on a specific port on the proxy server for incoming SOCKS4 and SOCKS5 requests.</summary>
///<remarks>This class also implements the SOCKS4a protocol.</remarks>
public sealed class SocksListener : Listener {
	///<summary>Initializes a new instance of the SocksListener class.</summary>
	///<param name="Port">The port to listen on.</param>
	///<remarks>The SocksListener will listen on all available network cards and it will not use an AuthenticationList.</remarks>
	public SocksListener(int Port) : this(IPAddress.Any, Port, null) {}
	///<summary>Initializes a new instance of the SocksListener class.</summary>
	///<param name="Port">The port to listen on.</param>
	///<param name="Address">The address to listen on. You can specify IPAddress.Any to listen on all installed network cards.</param>
	///<remarks>For the security of your server, try to avoid to listen on every network card (IPAddress.Any). Listening on a local IP address is usually sufficient and much more secure.</remarks>
	///<remarks>The SocksListener object will not use an AuthenticationList.</remarks>
	public SocksListener(IPAddress Address, int Port) : this(Address, Port, null) {}
	///<summary>Initializes a new instance of the SocksListener class.</summary>
	///<param name="Port">The port to listen on.</param>
	///<param name="AuthList">The list of valid login/password combinations. If you do not need password authentication, set this parameter to null.</param>
	///<remarks>The SocksListener will listen on all available network cards.</remarks>
	public SocksListener(int Port, AuthenticationList AuthList) : this(IPAddress.Any, Port, AuthList) {}
	///<summary>Initializes a new instance of the SocksListener class.</summary>
	///<param name="Port">The port to listen on.</param>
	///<param name="Address">The address to listen on. You can specify IPAddress.Any to listen on all installed network cards.</param>
	///<param name="AuthList">The list of valid login/password combinations. If you do not need password authentication, set this parameter to null.</param>
	///<remarks>For the security of your server, try to avoid to listen on every network card (IPAddress.Any). Listening on a local IP address is usually sufficient and much more secure.</remarks>
	public SocksListener(IPAddress Address, int Port, AuthenticationList AuthList) : base(Port, Address) {
		this.AuthList = AuthList;
	}
	///<summary>Called when there's an incoming client connection waiting to be accepted.</summary>
	///<param name="ar">The result of the asynchronous operation.</param>
	public override void OnAccept(IAsyncResult ar) {
		try {
			Socket NewSocket = ListenSocket.EndAccept(ar);
			if (NewSocket != null) {
				SocksClient NewClient = new SocksClient(NewSocket, new DestroyDelegate(this.RemoveClient), AuthList);
				AddClient(NewClient);
				NewClient.StartHandshake();
			}
		} catch {}
		try {
			//Restart Listening
			ListenSocket.BeginAccept(new AsyncCallback(this.OnAccept), ListenSocket);
		} catch {
			Dispose();
		}
	}
	///<summary>Gets or sets the AuthenticationList to be used when a SOCKS5 client connects.</summary>
	///<value>An AuthenticationList that is to be used when a SOCKS5 client connects.</value>
	///<remarks>This value can be null.</remarks>
	private AuthenticationList AuthList {
		get {
			return m_AuthList;
		}
		set {
			m_AuthList = value;
		}
	}
	///<summary>Returns a string representation of this object.</summary>
	///<returns>A string with information about this object.</returns>
	public override string ToString() {
		return "SOCKS service on " + Address.ToString() + ":" + Port.ToString();
	}
	///<summary>Returns a string that holds all the construction information for this object.</summary>
	///<value>A string that holds all the construction information for this object.</value>
	public override string ConstructString {
		get {
			if (AuthList == null)
				return "host:" + Address.ToString() + ";int:" + Port.ToString()+ ";null";
			else
				return "host:" + Address.ToString() + ";int:" + Port.ToString()+ ";authlist";
		}
	}
	// private variables
	/// <summary>Holds the value of the AuthList property.</summary>
	private AuthenticationList m_AuthList;
}

}