mirror of
https://github.com/MCCTeam/Minecraft-Console-Client
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231 lines
11 KiB
C#
231 lines
11 KiB
C#
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/*
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* Authors: Benton Stark
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*
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* Copyright (c) 2007-2012 Starksoft, LLC (http://www.starksoft.com)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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*/
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using System;
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using System.Text;
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using System.Net;
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using System.Net.Sockets;
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using System.IO;
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namespace Starksoft.Net.Proxy
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{
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/// <summary>
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/// Socks4a connection proxy class. This class implements the Socks4a standard proxy protocol
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/// which is an extension of the Socks4 protocol
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/// </summary>
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/// <remarks>
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/// In Socks version 4A if the client cannot resolve the destination host's domain name
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/// to find its IP address the server will attempt to resolve it.
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/// </remarks>
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public class Socks4aProxyClient : Socks4ProxyClient
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{
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private const string PROXY_NAME = "SOCKS4a";
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/// <summary>
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/// Default constructor.
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/// </summary>
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public Socks4aProxyClient()
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: base()
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{ }
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/// <summary>
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/// Creates a Socks4 proxy client object using the supplied TcpClient object connection.
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/// </summary>
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/// <param name="tcpClient">An open TcpClient object with an established connection.</param>
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public Socks4aProxyClient(TcpClient tcpClient)
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: base(tcpClient)
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{ }
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/// <summary>
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/// Create a Socks4a proxy client object. The default proxy port 1080 is used.
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/// </summary>
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/// <param name="proxyHost">Host name or IP address of the proxy server.</param>
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/// <param name="proxyUserId">Proxy user identification information for an IDENTD server.</param>
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public Socks4aProxyClient(string proxyHost, string proxyUserId)
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: base(proxyHost, proxyUserId)
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{ }
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/// <summary>
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/// Create a Socks4a proxy client object.
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/// </summary>
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/// <param name="proxyHost">Host name or IP address of the proxy server.</param>
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/// <param name="proxyPort">Port used to connect to proxy server.</param>
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/// <param name="proxyUserId">Proxy user identification information.</param>
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public Socks4aProxyClient(string proxyHost, int proxyPort, string proxyUserId)
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: base(proxyHost, proxyPort, proxyUserId)
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{ }
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/// <summary>
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/// Create a Socks4 proxy client object. The default proxy port 1080 is used.
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/// </summary>
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/// <param name="proxyHost">Host name or IP address of the proxy server.</param>
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public Socks4aProxyClient(string proxyHost) : base(proxyHost)
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{ }
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/// <summary>
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/// Create a Socks4a proxy client object.
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/// </summary>
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/// <param name="proxyHost">Host name or IP address of the proxy server.</param>
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/// <param name="proxyPort">Port used to connect to proxy server.</param>
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public Socks4aProxyClient(string proxyHost, int proxyPort)
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: base(proxyHost, proxyPort)
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{ }
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/// <summary>
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/// Gets String representing the name of the proxy.
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/// </summary>
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/// <remarks>This property will always return the value 'SOCKS4a'</remarks>
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public override string ProxyName
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{
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get { return PROXY_NAME; }
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}
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/// <summary>
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/// Sends a command to the proxy server.
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/// </summary>
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/// <param name="proxy">Proxy server data stream.</param>
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/// <param name="command">Proxy byte command to execute.</param>
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/// <param name="destinationHost">Destination host name or IP address.</param>
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/// <param name="destinationPort">Destination port number</param>
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/// <param name="userId">IDENTD user ID value.</param>
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/// <remarks>
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/// This method override the SendCommand message in the Sock4ProxyClient object. The override adds support for the
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/// Socks4a extensions which allow the proxy client to optionally command the proxy server to resolve the
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/// destination host IP address.
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/// </remarks>
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internal override void SendCommand(NetworkStream proxy, byte command, string destinationHost, int destinationPort, string userId)
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{
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// PROXY SERVER REQUEST
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//Please read SOCKS4.protocol first for an description of the version 4
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//protocol. This extension is intended to allow the use of SOCKS on hosts
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//which are not capable of resolving all domain names.
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//
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//In version 4, the client sends the following packet to the SOCKS server
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//to request a CONNECT or a BIND operation:
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//
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// +----+----+----+----+----+----+----+----+----+----+....+----+
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// | VN | CD | DSTPORT | DSTIP | USERID |NULL|
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// +----+----+----+----+----+----+----+----+----+----+....+----+
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// # of bytes: 1 1 2 4 variable 1
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//
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//VN is the SOCKS protocol version number and should be 4. CD is the
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//SOCKS command code and should be 1 for CONNECT or 2 for BIND. NULL
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//is a byte of all zero bits.
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//
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//For version 4A, if the client cannot resolve the destination host's
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//domain name to find its IP address, it should set the first three bytes
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//of DSTIP to NULL and the last byte to a non-zero value. (This corresponds
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//to IP address 0.0.0.x, with x nonzero. As decreed by IANA -- The
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//Internet Assigned Numbers Authority -- such an address is inadmissible
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//as a destination IP address and thus should never occur if the client
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//can resolve the domain name.) Following the NULL byte terminating
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//USERID, the client must sends the destination domain name and termiantes
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//it with another NULL byte. This is used for both CONNECT and BIND requests.
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//
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//A server using protocol 4A must check the DSTIP in the request packet.
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//If it represent address 0.0.0.x with nonzero x, the server must read
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//in the domain name that the client sends in the packet. The server
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//should resolve the domain name and make connection to the destination
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//host if it can.
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//
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//SOCKSified sockd may pass domain names that it cannot resolve to
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//the next-hop SOCKS server.
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// userId needs to be a zero length string so that the GetBytes method
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// works properly
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if (userId == null)
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userId = "";
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byte[] destIp = {0,0,0,1}; // build the invalid ip address as specified in the 4a protocol
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byte[] destPort = GetDestinationPortBytes(destinationPort);
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byte[] userIdBytes = ASCIIEncoding.ASCII.GetBytes(userId);
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byte[] hostBytes = ASCIIEncoding.ASCII.GetBytes(destinationHost);
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byte[] request = new byte[10 + userIdBytes.Length + hostBytes.Length];
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// set the bits on the request byte array
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request[0] = SOCKS4_VERSION_NUMBER;
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request[1] = command;
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destPort.CopyTo(request, 2);
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destIp.CopyTo(request, 4);
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userIdBytes.CopyTo(request, 8); // copy the userid to the request byte array
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request[8 + userIdBytes.Length] = 0x00; // null (byte with all zeros) terminator for userId
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hostBytes.CopyTo(request, 9 + userIdBytes.Length); // copy the host name to the request byte array
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request[9 + userIdBytes.Length + hostBytes.Length] = 0x00; // null (byte with all zeros) terminator for userId
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// send the connect request
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proxy.Write(request, 0, request.Length);
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// wait for the proxy server to send a response
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base.WaitForData(proxy);
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// PROXY SERVER RESPONSE
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// The SOCKS server checks to see whether such a request should be granted
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// based on any combination of source IP address, destination IP address,
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// destination port number, the userid, and information it may obtain by
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// consulting IDENT, cf. RFC 1413. If the request is granted, the SOCKS
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// server makes a connection to the specified port of the destination host.
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// A reply packet is sent to the client when this connection is established,
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// or when the request is rejected or the operation fails.
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//
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// +----+----+----+----+----+----+----+----+
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// | VN | CD | DSTPORT | DSTIP |
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// +----+----+----+----+----+----+----+----+
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// # of bytes: 1 1 2 4
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//
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// VN is the version of the reply code and should be 0. CD is the result
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// code with one of the following values:
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//
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// 90: request granted
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// 91: request rejected or failed
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// 92: request rejected becuase SOCKS server cannot connect to
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// identd on the client
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// 93: request rejected because the client program and identd
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// report different user-ids
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//
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// The remaining fields are ignored.
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//
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// The SOCKS server closes its connection immediately after notifying
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// the client of a failed or rejected request. For a successful request,
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// the SOCKS server gets ready to relay traffic on both directions. This
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// enables the client to do I/O on its connection as if it were directly
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// connected to the application server.
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// create an 8 byte response array
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byte[] response = new byte[8];
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// read the resonse from the network stream
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proxy.Read(response, 0, 8);
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// evaluate the reply code for an error condition
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if (response[1] != SOCKS4_CMD_REPLY_REQUEST_GRANTED)
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HandleProxyCommandError(response, destinationHost, destinationPort);
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}
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}
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}
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