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241
ProxyServer/SocksHandler.cs
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241
ProxyServer/SocksHandler.cs
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/*
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Copyright © 2002, The KPD-Team
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All rights reserved.
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http://www.mentalis.org/
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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- Neither the name of the KPD-Team, nor the names of its contributors
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may be used to endorse or promote products derived from this
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software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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using System;
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using System.Net;
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using System.Net.Sockets;
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using Org.Mentalis.Proxy;
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namespace Org.Mentalis.Proxy.Socks {
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///<summary>Defines the signature of the method that's called when the SOCKS negotiation is complete.</summary>
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///<param name="Success">Indicates whether the negotiation was successful or not.</param>
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///<param name="Remote">The connection with the remote server.</param>
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internal delegate void NegotiationCompleteDelegate(bool Success, Socket Remote);
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///<summary>Implements a specific version of the SOCKS protocol.</summary>
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internal abstract class SocksHandler {
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///<summary>Initializes a new instance of the SocksHandler class.</summary>
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///<param name="ClientConnection">The connection with the client.</param>
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///<param name="Callback">The method to call when the SOCKS negotiation is complete.</param>
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///<exception cref="ArgumentNullException"><c>Callback</c> is null.</exception>
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public SocksHandler(Socket ClientConnection, NegotiationCompleteDelegate Callback) {
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if (Callback == null)
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throw new ArgumentNullException();
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Connection = ClientConnection;
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Signaler = Callback;
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}
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///<summary>Gets or sets the username of the SOCKS user.</summary>
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///<value>A String representing the username of the logged on user.</value>
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///<exception cref="ArgumentNullException">The specified value is null.</exception>
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internal string Username {
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get {
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return m_Username;
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}
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set {
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if (value == null)
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throw new ArgumentNullException();
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m_Username = value;
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}
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}
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///<summary>Gets or sets the connection with the client.</summary>
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///<value>A Socket representing the connection between the proxy server and the SOCKS client.</value>
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///<exception cref="ArgumentNullException">The specified value is null.</exception>
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protected Socket Connection {
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get {
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return m_Connection;
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}
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set {
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if (value == null)
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throw new ArgumentNullException();
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m_Connection = value;
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}
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}
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///<summary>Gets a buffer that can be used when receiving bytes from the client.</summary>
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///<value>A byte array that can be used when receiving bytes from the client.</value>
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protected byte[] Buffer {
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get {
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return m_Buffer;
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}
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}
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///<summary>Gets or sets a byte array that can be used to store received bytes from the client.</summary>
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///<value>A byte array that can be used to store bytes from the client.</value>
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protected byte[] Bytes {
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get {
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return m_Bytes;
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}
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set {
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m_Bytes = value;
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}
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}
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///<summary>Gets or sets the connection with the remote host.</summary>
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///<value>A Socket representing the connection between the proxy server and the remote host.</value>
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///<exception cref="ArgumentNullException">The specified value is null.</exception>
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protected Socket RemoteConnection {
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get {
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return m_RemoteConnection;
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}
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set {
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m_RemoteConnection = value;
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try {
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m_RemoteConnection.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.KeepAlive, 1);
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} catch {}
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}
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}
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///<summary>Gets or sets the socket that is used to accept incoming connections.</summary>
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///<value>A Socket that is used to accept incoming connections.</value>
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protected Socket AcceptSocket {
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get {
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return m_AcceptSocket;
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}
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set {
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m_AcceptSocket = value;
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}
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}
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///<summary>Gets or sets the IP address of the requested remote server.</summary>
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///<value>An IPAddress object specifying the address of the requested remote server.</value>
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protected IPAddress RemoteBindIP {
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get {
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return m_RemoteBindIP;
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}
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set {
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m_RemoteBindIP = value;
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}
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}
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///<summary>Closes the listening socket if present, and signals the parent object that SOCKS negotiation is complete.</summary>
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///<param name="Success">Indicates whether the SOCKS negotiation was successful or not.</param>
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protected void Dispose(bool Success) {
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if (AcceptSocket != null)
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AcceptSocket.Close();
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Signaler(Success, RemoteConnection);
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}
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///<summary>Starts accepting bytes from the client.</summary>
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public void StartNegotiating() {
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try {
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Connection.BeginReceive(Buffer, 0, Buffer.Length, SocketFlags.None, new AsyncCallback(this.OnReceiveBytes), Connection);
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} catch {
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Dispose(false);
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}
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}
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///<summary>Called when we receive some bytes from the client.</summary>
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///<param name="ar">The result of the asynchronous operation.</param>
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protected void OnReceiveBytes(IAsyncResult ar) {
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try {
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int Ret = Connection.EndReceive(ar);
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if (Ret <= 0)
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Dispose(false);
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AddBytes(Buffer, Ret);
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if (IsValidRequest(Bytes))
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ProcessRequest(Bytes);
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else
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Connection.BeginReceive(Buffer, 0, Buffer.Length, SocketFlags.None, new AsyncCallback(this.OnReceiveBytes), Connection);
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} catch {
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Dispose(false);
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}
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}
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///<summary>Called when an OK reply has been sent to the client.</summary>
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///<param name="ar">The result of the asynchronous operation.</param>
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protected void OnDisposeGood(IAsyncResult ar) {
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try {
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if (Connection.EndSend(ar) > 0) {
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Dispose(true);
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return;
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}
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} catch {}
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Dispose(false);
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}
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///<summary>Called when a negative reply has been sent to the client.</summary>
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///<param name="ar">The result of the asynchronous operation.</param>
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protected void OnDisposeBad(IAsyncResult ar) {
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try {
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Connection.EndSend(ar);
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} catch {}
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Dispose(false);
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}
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///<summary>Adds some bytes to a byte aray.</summary>
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///<param name="NewBytes">The new bytes to add.</param>
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///<param name="Cnt">The number of bytes to add.</param>
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protected void AddBytes(byte [] NewBytes, int Cnt) {
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if (Cnt <= 0 || NewBytes == null || Cnt > NewBytes.Length)
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return;
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if (Bytes == null) {
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Bytes = new byte[Cnt];
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} else {
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byte [] tmp = Bytes;
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Bytes = new byte[Bytes.Length + Cnt];
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Array.Copy(tmp, 0, Bytes, 0, tmp.Length);
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}
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Array.Copy(NewBytes, 0, Bytes, Bytes.Length - Cnt, Cnt);
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}
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///<summary>Called when the AcceptSocket should start accepting incoming connections.</summary>
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///<param name="ar">The result of the asynchronous operation.</param>
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protected void OnStartAccept(IAsyncResult ar) {
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try {
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if (Connection.EndSend(ar) <= 0)
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Dispose(false);
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else
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AcceptSocket.BeginAccept(new AsyncCallback(this.OnAccept), AcceptSocket);
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} catch {
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Dispose(false);
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}
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}
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///<summary>Called when there's an incoming connection in the AcceptSocket queue.</summary>
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///<param name="ar">The result of the asynchronous operation.</param>
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protected abstract void OnAccept(IAsyncResult ar);
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///<summary>Sends a reply to the client connection and disposes it afterwards.</summary>
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///<param name="Value">A byte that contains the reply code to send to the client.</param>
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protected abstract void Dispose(byte Value);
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///<summary>Checks whether a specific request is a valid SOCKS request or not.</summary>
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///<param name="Request">The request array to check.</param>
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///<returns>True is the specified request is valid, false otherwise</returns>
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protected abstract bool IsValidRequest(byte [] Request);
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///<summary>Processes a SOCKS request from a client.</summary>
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///<param name="Request">The request to process.</param>
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protected abstract void ProcessRequest(byte [] Request);
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// private variables
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/// <summary>Holds the value of the Username property.</summary>
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private string m_Username;
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/// <summary>Holds the value of the Buffer property.</summary>
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private byte [] m_Buffer = new byte[1024];
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/// <summary>Holds the value of the Bytes property.</summary>
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private byte [] m_Bytes;
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/// <summary>Holds the value of the RemoteConnection property.</summary>
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private Socket m_RemoteConnection;
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/// <summary>Holds the value of the Connection property.</summary>
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private Socket m_Connection;
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/// <summary>Holds the value of the AcceptSocket property.</summary>
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private Socket m_AcceptSocket;
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/// <summary>Holds the value of the RemoteBindIP property.</summary>
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private IPAddress m_RemoteBindIP;
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/// <summary>Holds the address of the method to call when the SOCKS negotiation is complete.</summary>
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private NegotiationCompleteDelegate Signaler;
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}
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}
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