mirror of
https://github.com/MCCTeam/Minecraft-Console-Client
synced 2025-10-14 21:22:49 +00:00
766 lines
32 KiB
C#
766 lines
32 KiB
C#
|
/*
|
||
|
|
* Authors: Benton Stark
|
||
|
|
*
|
||
|
|
* Copyright (c) 2007-2012 Starksoft, LLC (http://www.starksoft.com)
|
||
|
|
*
|
||
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
||
|
|
* of this software and associated documentation files (the "Software"), to deal
|
||
|
|
* in the Software without restriction, including without limitation the rights
|
||
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||
|
|
* copies of the Software, and to permit persons to whom the Software is
|
||
|
|
* furnished to do so, subject to the following conditions:
|
||
|
|
*
|
||
|
|
* The above copyright notice and this permission notice shall be included in
|
||
|
|
* all copies or substantial portions of the Software.
|
||
|
|
*
|
||
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||
|
|
* THE SOFTWARE.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
using System;
|
||
|
|
using System.Text;
|
||
|
|
using System.Net;
|
||
|
|
using System.Net.Sockets;
|
||
|
|
using System.Globalization;
|
||
|
|
using System.ComponentModel;
|
||
|
|
|
||
|
|
namespace Starksoft.Net.Proxy
|
||
|
|
{
|
||
|
|
/// <summary>
|
||
|
|
/// Socks5 connection proxy class. This class implements the Socks5 standard proxy protocol.
|
||
|
|
/// </summary>
|
||
|
|
/// <remarks>
|
||
|
|
/// This implementation supports TCP proxy connections with a Socks v5 server.
|
||
|
|
/// </remarks>
|
||
|
|
public class Socks5ProxyClient : IProxyClient
|
||
|
|
{
|
||
|
|
private string _proxyHost;
|
||
|
|
private int _proxyPort;
|
||
|
|
private string _proxyUserName;
|
||
|
|
private string _proxyPassword;
|
||
|
|
private SocksAuthentication _proxyAuthMethod;
|
||
|
|
private TcpClient _tcpClient;
|
||
|
|
private TcpClient _tcpClientCached;
|
||
|
|
|
||
|
|
private const string PROXY_NAME = "SOCKS5";
|
||
|
|
private const int SOCKS5_DEFAULT_PORT = 1080;
|
||
|
|
|
||
|
|
private const byte SOCKS5_VERSION_NUMBER = 5;
|
||
|
|
private const byte SOCKS5_RESERVED = 0x00;
|
||
|
|
private const byte SOCKS5_AUTH_NUMBER_OF_AUTH_METHODS_SUPPORTED = 2;
|
||
|
|
private const byte SOCKS5_AUTH_METHOD_NO_AUTHENTICATION_REQUIRED = 0x00;
|
||
|
|
private const byte SOCKS5_AUTH_METHOD_GSSAPI = 0x01;
|
||
|
|
private const byte SOCKS5_AUTH_METHOD_USERNAME_PASSWORD = 0x02;
|
||
|
|
private const byte SOCKS5_AUTH_METHOD_IANA_ASSIGNED_RANGE_BEGIN = 0x03;
|
||
|
|
private const byte SOCKS5_AUTH_METHOD_IANA_ASSIGNED_RANGE_END = 0x7f;
|
||
|
|
private const byte SOCKS5_AUTH_METHOD_RESERVED_RANGE_BEGIN = 0x80;
|
||
|
|
private const byte SOCKS5_AUTH_METHOD_RESERVED_RANGE_END = 0xfe;
|
||
|
|
private const byte SOCKS5_AUTH_METHOD_REPLY_NO_ACCEPTABLE_METHODS = 0xff;
|
||
|
|
private const byte SOCKS5_CMD_CONNECT = 0x01;
|
||
|
|
private const byte SOCKS5_CMD_BIND = 0x02;
|
||
|
|
private const byte SOCKS5_CMD_UDP_ASSOCIATE = 0x03;
|
||
|
|
private const byte SOCKS5_CMD_REPLY_SUCCEEDED = 0x00;
|
||
|
|
private const byte SOCKS5_CMD_REPLY_GENERAL_SOCKS_SERVER_FAILURE = 0x01;
|
||
|
|
private const byte SOCKS5_CMD_REPLY_CONNECTION_NOT_ALLOWED_BY_RULESET = 0x02;
|
||
|
|
private const byte SOCKS5_CMD_REPLY_NETWORK_UNREACHABLE = 0x03;
|
||
|
|
private const byte SOCKS5_CMD_REPLY_HOST_UNREACHABLE = 0x04;
|
||
|
|
private const byte SOCKS5_CMD_REPLY_CONNECTION_REFUSED = 0x05;
|
||
|
|
private const byte SOCKS5_CMD_REPLY_TTL_EXPIRED = 0x06;
|
||
|
|
private const byte SOCKS5_CMD_REPLY_COMMAND_NOT_SUPPORTED = 0x07;
|
||
|
|
private const byte SOCKS5_CMD_REPLY_ADDRESS_TYPE_NOT_SUPPORTED = 0x08;
|
||
|
|
private const byte SOCKS5_ADDRTYPE_IPV4 = 0x01;
|
||
|
|
private const byte SOCKS5_ADDRTYPE_DOMAIN_NAME = 0x03;
|
||
|
|
private const byte SOCKS5_ADDRTYPE_IPV6 = 0x04;
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Authentication itemType.
|
||
|
|
/// </summary>
|
||
|
|
private enum SocksAuthentication
|
||
|
|
{
|
||
|
|
/// <summary>
|
||
|
|
/// No authentication used.
|
||
|
|
/// </summary>
|
||
|
|
None,
|
||
|
|
/// <summary>
|
||
|
|
/// Username and password authentication.
|
||
|
|
/// </summary>
|
||
|
|
UsernamePassword
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Create a Socks5 proxy client object.
|
||
|
|
/// </summary>
|
||
|
|
public Socks5ProxyClient() { }
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Creates a Socks5 proxy client object using the supplied TcpClient object connection.
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="tcpClient">A TcpClient connection object.</param>
|
||
|
|
public Socks5ProxyClient(TcpClient tcpClient)
|
||
|
|
{
|
||
|
|
if (tcpClient == null)
|
||
|
|
throw new ArgumentNullException("tcpClient");
|
||
|
|
|
||
|
|
_tcpClientCached = tcpClient;
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Create a Socks5 proxy client object. The default proxy port 1080 is used.
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="proxyHost">Host name or IP address of the proxy server.</param>
|
||
|
|
public Socks5ProxyClient(string proxyHost)
|
||
|
|
{
|
||
|
|
if (String.IsNullOrEmpty(proxyHost))
|
||
|
|
throw new ArgumentNullException("proxyHost");
|
||
|
|
|
||
|
|
_proxyHost = proxyHost;
|
||
|
|
_proxyPort = SOCKS5_DEFAULT_PORT;
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Create a Socks5 proxy client object.
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="proxyHost">Host name or IP address of the proxy server.</param>
|
||
|
|
/// <param name="proxyPort">Port used to connect to proxy server.</param>
|
||
|
|
public Socks5ProxyClient(string proxyHost, int proxyPort)
|
||
|
|
{
|
||
|
|
if (String.IsNullOrEmpty(proxyHost))
|
||
|
|
throw new ArgumentNullException("proxyHost");
|
||
|
|
|
||
|
|
if (proxyPort <= 0 || proxyPort > 65535)
|
||
|
|
throw new ArgumentOutOfRangeException("proxyPort", "port must be greater than zero and less than 65535");
|
||
|
|
|
||
|
|
_proxyHost = proxyHost;
|
||
|
|
_proxyPort = proxyPort;
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Create a Socks5 proxy client object. The default proxy port 1080 is used.
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="proxyHost">Host name or IP address of the proxy server.</param>
|
||
|
|
/// <param name="proxyUserName">Proxy authentication user name.</param>
|
||
|
|
/// <param name="proxyPassword">Proxy authentication password.</param>
|
||
|
|
public Socks5ProxyClient(string proxyHost, string proxyUserName, string proxyPassword)
|
||
|
|
{
|
||
|
|
if (String.IsNullOrEmpty(proxyHost))
|
||
|
|
throw new ArgumentNullException("proxyHost");
|
||
|
|
|
||
|
|
if (proxyUserName == null)
|
||
|
|
throw new ArgumentNullException("proxyUserName");
|
||
|
|
|
||
|
|
if (proxyPassword == null)
|
||
|
|
throw new ArgumentNullException("proxyPassword");
|
||
|
|
|
||
|
|
_proxyHost = proxyHost;
|
||
|
|
_proxyPort = SOCKS5_DEFAULT_PORT;
|
||
|
|
_proxyUserName = proxyUserName;
|
||
|
|
_proxyPassword = proxyPassword;
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Create a Socks5 proxy client object.
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="proxyHost">Host name or IP address of the proxy server.</param>
|
||
|
|
/// <param name="proxyPort">Port used to connect to proxy server.</param>
|
||
|
|
/// <param name="proxyUserName">Proxy authentication user name.</param>
|
||
|
|
/// <param name="proxyPassword">Proxy authentication password.</param>
|
||
|
|
public Socks5ProxyClient(string proxyHost, int proxyPort, string proxyUserName, string proxyPassword)
|
||
|
|
{
|
||
|
|
if (String.IsNullOrEmpty(proxyHost))
|
||
|
|
throw new ArgumentNullException("proxyHost");
|
||
|
|
|
||
|
|
if (proxyPort <= 0 || proxyPort > 65535)
|
||
|
|
throw new ArgumentOutOfRangeException("proxyPort", "port must be greater than zero and less than 65535");
|
||
|
|
|
||
|
|
if (proxyUserName == null)
|
||
|
|
throw new ArgumentNullException("proxyUserName");
|
||
|
|
|
||
|
|
if (proxyPassword == null)
|
||
|
|
throw new ArgumentNullException("proxyPassword");
|
||
|
|
|
||
|
|
_proxyHost = proxyHost;
|
||
|
|
_proxyPort = proxyPort;
|
||
|
|
_proxyUserName = proxyUserName;
|
||
|
|
_proxyPassword = proxyPassword;
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Gets or sets host name or IP address of the proxy server.
|
||
|
|
/// </summary>
|
||
|
|
public string ProxyHost
|
||
|
|
{
|
||
|
|
get { return _proxyHost; }
|
||
|
|
set { _proxyHost = value; }
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Gets or sets port used to connect to proxy server.
|
||
|
|
/// </summary>
|
||
|
|
public int ProxyPort
|
||
|
|
{
|
||
|
|
get { return _proxyPort; }
|
||
|
|
set { _proxyPort = value; }
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Gets String representing the name of the proxy.
|
||
|
|
/// </summary>
|
||
|
|
/// <remarks>This property will always return the value 'SOCKS5'</remarks>
|
||
|
|
public string ProxyName
|
||
|
|
{
|
||
|
|
get { return PROXY_NAME; }
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Gets or sets proxy authentication user name.
|
||
|
|
/// </summary>
|
||
|
|
public string ProxyUserName
|
||
|
|
{
|
||
|
|
get { return _proxyUserName; }
|
||
|
|
set { _proxyUserName = value; }
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Gets or sets proxy authentication password.
|
||
|
|
/// </summary>
|
||
|
|
public string ProxyPassword
|
||
|
|
{
|
||
|
|
get { return _proxyPassword; }
|
||
|
|
set { _proxyPassword = value; }
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Gets or sets the TcpClient object.
|
||
|
|
/// This property can be set prior to executing CreateConnection to use an existing TcpClient connection.
|
||
|
|
/// </summary>
|
||
|
|
public TcpClient TcpClient
|
||
|
|
{
|
||
|
|
get { return _tcpClientCached; }
|
||
|
|
set { _tcpClientCached = value; }
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Creates a remote TCP connection through a proxy server to the destination host on the destination port.
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="destinationHost">Destination host name or IP address of the destination server.</param>
|
||
|
|
/// <param name="destinationPort">Port number to connect to on the destination host.</param>
|
||
|
|
/// <returns>
|
||
|
|
/// Returns an open TcpClient object that can be used normally to communicate
|
||
|
|
/// with the destination server
|
||
|
|
/// </returns>
|
||
|
|
/// <remarks>
|
||
|
|
/// This method creates a connection to the proxy server and instructs the proxy server
|
||
|
|
/// to make a pass through connection to the specified destination host on the specified
|
||
|
|
/// port.
|
||
|
|
/// </remarks>
|
||
|
|
public TcpClient CreateConnection(string destinationHost, int destinationPort)
|
||
|
|
{
|
||
|
|
if (String.IsNullOrEmpty(destinationHost))
|
||
|
|
throw new ArgumentNullException("destinationHost");
|
||
|
|
|
||
|
|
if (destinationPort <= 0 || destinationPort > 65535)
|
||
|
|
throw new ArgumentOutOfRangeException("destinationPort", "port must be greater than zero and less than 65535");
|
||
|
|
|
||
|
|
try
|
||
|
|
{
|
||
|
|
// if we have no cached tcpip connection then create one
|
||
|
|
if (_tcpClientCached == null)
|
||
|
|
{
|
||
|
|
if (String.IsNullOrEmpty(_proxyHost))
|
||
|
|
throw new ProxyException("ProxyHost property must contain a value.");
|
||
|
|
|
||
|
|
if (_proxyPort <= 0 || _proxyPort > 65535)
|
||
|
|
throw new ProxyException("ProxyPort value must be greater than zero and less than 65535");
|
||
|
|
|
||
|
|
// create new tcp client object to the proxy server
|
||
|
|
_tcpClient = new TcpClient();
|
||
|
|
|
||
|
|
// attempt to open the connection
|
||
|
|
_tcpClient.Connect(_proxyHost, _proxyPort);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
_tcpClient = _tcpClientCached;
|
||
|
|
}
|
||
|
|
|
||
|
|
// determine which authentication method the client would like to use
|
||
|
|
DetermineClientAuthMethod();
|
||
|
|
|
||
|
|
// negotiate which authentication methods are supported / accepted by the server
|
||
|
|
NegotiateServerAuthMethod();
|
||
|
|
|
||
|
|
// send a connect command to the proxy server for destination host and port
|
||
|
|
SendCommand(SOCKS5_CMD_CONNECT, destinationHost, destinationPort);
|
||
|
|
|
||
|
|
// remove the private reference to the tcp client so the proxy object does not keep it
|
||
|
|
// return the open proxied tcp client object to the caller for normal use
|
||
|
|
TcpClient rtn = _tcpClient;
|
||
|
|
_tcpClient = null;
|
||
|
|
return rtn;
|
||
|
|
}
|
||
|
|
catch (Exception ex)
|
||
|
|
{
|
||
|
|
throw new ProxyException(String.Format(CultureInfo.InvariantCulture, "Connection to proxy host {0} on port {1} failed.", Utils.GetHost(_tcpClient), Utils.GetPort(_tcpClient)), ex);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
private void DetermineClientAuthMethod()
|
||
|
|
{
|
||
|
|
// set the authentication itemType used based on values inputed by the user
|
||
|
|
if (_proxyUserName != null && _proxyPassword != null)
|
||
|
|
_proxyAuthMethod = SocksAuthentication.UsernamePassword;
|
||
|
|
else
|
||
|
|
_proxyAuthMethod = SocksAuthentication.None;
|
||
|
|
}
|
||
|
|
|
||
|
|
private void NegotiateServerAuthMethod()
|
||
|
|
{
|
||
|
|
// get a reference to the network stream
|
||
|
|
NetworkStream stream = _tcpClient.GetStream();
|
||
|
|
|
||
|
|
// SERVER AUTHENTICATION REQUEST
|
||
|
|
// The client connects to the server, and sends a version
|
||
|
|
// identifier/method selection message:
|
||
|
|
//
|
||
|
|
// +----+----------+----------+
|
||
|
|
// |VER | NMETHODS | METHODS |
|
||
|
|
// +----+----------+----------+
|
||
|
|
// | 1 | 1 | 1 to 255 |
|
||
|
|
// +----+----------+----------+
|
||
|
|
|
||
|
|
byte[] authRequest = new byte[4];
|
||
|
|
authRequest[0] = SOCKS5_VERSION_NUMBER;
|
||
|
|
authRequest[1] = SOCKS5_AUTH_NUMBER_OF_AUTH_METHODS_SUPPORTED;
|
||
|
|
authRequest[2] = SOCKS5_AUTH_METHOD_NO_AUTHENTICATION_REQUIRED;
|
||
|
|
authRequest[3] = SOCKS5_AUTH_METHOD_USERNAME_PASSWORD;
|
||
|
|
|
||
|
|
// send the request to the server specifying authentication types supported by the client.
|
||
|
|
stream.Write(authRequest, 0, authRequest.Length);
|
||
|
|
|
||
|
|
// SERVER AUTHENTICATION RESPONSE
|
||
|
|
// The server selects from one of the methods given in METHODS, and
|
||
|
|
// sends a METHOD selection message:
|
||
|
|
//
|
||
|
|
// +----+--------+
|
||
|
|
// |VER | METHOD |
|
||
|
|
// +----+--------+
|
||
|
|
// | 1 | 1 |
|
||
|
|
// +----+--------+
|
||
|
|
//
|
||
|
|
// If the selected METHOD is X'FF', none of the methods listed by the
|
||
|
|
// client are acceptable, and the client MUST close the connection.
|
||
|
|
//
|
||
|
|
// The values currently defined for METHOD are:
|
||
|
|
// * X'00' NO AUTHENTICATION REQUIRED
|
||
|
|
// * X'01' GSSAPI
|
||
|
|
// * X'02' USERNAME/PASSWORD
|
||
|
|
// * X'03' to X'7F' IANA ASSIGNED
|
||
|
|
// * X'80' to X'FE' RESERVED FOR PRIVATE METHODS
|
||
|
|
// * X'FF' NO ACCEPTABLE METHODS
|
||
|
|
|
||
|
|
// receive the server response
|
||
|
|
byte[] response = new byte[2];
|
||
|
|
stream.Read(response, 0, response.Length);
|
||
|
|
|
||
|
|
// the first byte contains the socks version number (e.g. 5)
|
||
|
|
// the second byte contains the auth method acceptable to the proxy server
|
||
|
|
byte acceptedAuthMethod = response[1];
|
||
|
|
|
||
|
|
// if the server does not accept any of our supported authenication methods then throw an error
|
||
|
|
if (acceptedAuthMethod == SOCKS5_AUTH_METHOD_REPLY_NO_ACCEPTABLE_METHODS)
|
||
|
|
{
|
||
|
|
_tcpClient.Close();
|
||
|
|
throw new ProxyException("The proxy destination does not accept the supported proxy client authentication methods.");
|
||
|
|
}
|
||
|
|
|
||
|
|
// if the server accepts a username and password authentication and none is provided by the user then throw an error
|
||
|
|
if (acceptedAuthMethod == SOCKS5_AUTH_METHOD_USERNAME_PASSWORD && _proxyAuthMethod == SocksAuthentication.None)
|
||
|
|
{
|
||
|
|
_tcpClient.Close();
|
||
|
|
throw new ProxyException("The proxy destination requires a username and password for authentication.");
|
||
|
|
}
|
||
|
|
|
||
|
|
if (acceptedAuthMethod == SOCKS5_AUTH_METHOD_USERNAME_PASSWORD)
|
||
|
|
{
|
||
|
|
|
||
|
|
// USERNAME / PASSWORD SERVER REQUEST
|
||
|
|
// Once the SOCKS V5 server has started, and the client has selected the
|
||
|
|
// Username/Password Authentication protocol, the Username/Password
|
||
|
|
// subnegotiation begins. This begins with the client producing a
|
||
|
|
// Username/Password request:
|
||
|
|
//
|
||
|
|
// +----+------+----------+------+----------+
|
||
|
|
// |VER | ULEN | UNAME | PLEN | PASSWD |
|
||
|
|
// +----+------+----------+------+----------+
|
||
|
|
// | 1 | 1 | 1 to 255 | 1 | 1 to 255 |
|
||
|
|
// +----+------+----------+------+----------+
|
||
|
|
|
||
|
|
// create a data structure (binary array) containing credentials
|
||
|
|
// to send to the proxy server which consists of clear username and password data
|
||
|
|
byte[] credentials = new byte[_proxyUserName.Length + _proxyPassword.Length + 3];
|
||
|
|
|
||
|
|
// for SOCKS5 username/password authentication the VER field must be set to 0x01
|
||
|
|
// http://en.wikipedia.org/wiki/SOCKS
|
||
|
|
// field 1: version number, 1 byte (must be 0x01)"
|
||
|
|
credentials[0] = 0x01;
|
||
|
|
credentials[1] = (byte)_proxyUserName.Length;
|
||
|
|
Array.Copy(ASCIIEncoding.ASCII.GetBytes(_proxyUserName), 0, credentials, 2, _proxyUserName.Length);
|
||
|
|
credentials[_proxyUserName.Length + 2] = (byte)_proxyPassword.Length;
|
||
|
|
Array.Copy(ASCIIEncoding.ASCII.GetBytes(_proxyPassword), 0, credentials, _proxyUserName.Length + 3, _proxyPassword.Length);
|
||
|
|
|
||
|
|
// USERNAME / PASSWORD SERVER RESPONSE
|
||
|
|
// The server verifies the supplied UNAME and PASSWD, and sends the
|
||
|
|
// following response:
|
||
|
|
//
|
||
|
|
// +----+--------+
|
||
|
|
// |VER | STATUS |
|
||
|
|
// +----+--------+
|
||
|
|
// | 1 | 1 |
|
||
|
|
// +----+--------+
|
||
|
|
//
|
||
|
|
// A STATUS field of X'00' indicates success. If the server returns a
|
||
|
|
// `failure' (STATUS value other than X'00') status, it MUST close the
|
||
|
|
// connection.
|
||
|
|
|
||
|
|
// transmit credentials to the proxy server
|
||
|
|
stream.Write(credentials, 0, credentials.Length);
|
||
|
|
|
||
|
|
// read the response from the proxy server
|
||
|
|
byte[] crResponse = new byte[2];
|
||
|
|
stream.Read(crResponse, 0, crResponse.Length);
|
||
|
|
|
||
|
|
// check to see if the proxy server accepted the credentials
|
||
|
|
if (crResponse[1] != 0)
|
||
|
|
{
|
||
|
|
_tcpClient.Close();
|
||
|
|
throw new ProxyException("Proxy authentification failure! The proxy server has reported that the userid and/or password is not valid.");
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
private byte GetDestAddressType(string host)
|
||
|
|
{
|
||
|
|
IPAddress ipAddr = null;
|
||
|
|
|
||
|
|
bool result = IPAddress.TryParse(host, out ipAddr);
|
||
|
|
|
||
|
|
if (!result)
|
||
|
|
return SOCKS5_ADDRTYPE_DOMAIN_NAME;
|
||
|
|
|
||
|
|
switch (ipAddr.AddressFamily)
|
||
|
|
{
|
||
|
|
case AddressFamily.InterNetwork:
|
||
|
|
return SOCKS5_ADDRTYPE_IPV4;
|
||
|
|
case AddressFamily.InterNetworkV6:
|
||
|
|
return SOCKS5_ADDRTYPE_IPV6;
|
||
|
|
default:
|
||
|
|
throw new ProxyException(String.Format(CultureInfo.InvariantCulture, "The host addess {0} of type '{1}' is not a supported address type. The supported types are InterNetwork and InterNetworkV6.", host, Enum.GetName(typeof(AddressFamily), ipAddr.AddressFamily)));
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
private byte[] GetDestAddressBytes(byte addressType, string host)
|
||
|
|
{
|
||
|
|
switch (addressType)
|
||
|
|
{
|
||
|
|
case SOCKS5_ADDRTYPE_IPV4:
|
||
|
|
case SOCKS5_ADDRTYPE_IPV6:
|
||
|
|
return IPAddress.Parse(host).GetAddressBytes();
|
||
|
|
case SOCKS5_ADDRTYPE_DOMAIN_NAME:
|
||
|
|
// create a byte array to hold the host name bytes plus one byte to store the length
|
||
|
|
byte[] bytes = new byte[host.Length + 1];
|
||
|
|
// if the address field contains a fully-qualified domain name. The first
|
||
|
|
// octet of the address field contains the number of octets of name that
|
||
|
|
// follow, there is no terminating NUL octet.
|
||
|
|
bytes[0] = Convert.ToByte(host.Length);
|
||
|
|
Encoding.ASCII.GetBytes(host).CopyTo(bytes, 1);
|
||
|
|
return bytes;
|
||
|
|
default:
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
private byte[] GetDestPortBytes(int value)
|
||
|
|
{
|
||
|
|
byte[] array = new byte[2];
|
||
|
|
array[0] = Convert.ToByte(value / 256);
|
||
|
|
array[1] = Convert.ToByte(value % 256);
|
||
|
|
return array;
|
||
|
|
}
|
||
|
|
|
||
|
|
private void SendCommand(byte command, string destinationHost, int destinationPort)
|
||
|
|
{
|
||
|
|
NetworkStream stream = _tcpClient.GetStream();
|
||
|
|
|
||
|
|
byte addressType = GetDestAddressType(destinationHost);
|
||
|
|
byte[] destAddr = GetDestAddressBytes(addressType, destinationHost);
|
||
|
|
byte[] destPort = GetDestPortBytes(destinationPort);
|
||
|
|
|
||
|
|
// The connection request is made up of 6 bytes plus the
|
||
|
|
// length of the variable address byte array
|
||
|
|
//
|
||
|
|
// +----+-----+-------+------+----------+----------+
|
||
|
|
// |VER | CMD | RSV | ATYP | DST.ADDR | DST.PORT |
|
||
|
|
// +----+-----+-------+------+----------+----------+
|
||
|
|
// | 1 | 1 | X'00' | 1 | Variable | 2 |
|
||
|
|
// +----+-----+-------+------+----------+----------+
|
||
|
|
//
|
||
|
|
// * VER protocol version: X'05'
|
||
|
|
// * CMD
|
||
|
|
// * CONNECT X'01'
|
||
|
|
// * BIND X'02'
|
||
|
|
// * UDP ASSOCIATE X'03'
|
||
|
|
// * RSV RESERVED
|
||
|
|
// * ATYP address itemType of following address
|
||
|
|
// * IP V4 address: X'01'
|
||
|
|
// * DOMAINNAME: X'03'
|
||
|
|
// * IP V6 address: X'04'
|
||
|
|
// * DST.ADDR desired destination address
|
||
|
|
// * DST.PORT desired destination port in network octet order
|
||
|
|
|
||
|
|
byte[] request = new byte[4 + destAddr.Length + 2];
|
||
|
|
request[0] = SOCKS5_VERSION_NUMBER;
|
||
|
|
request[1] = command;
|
||
|
|
request[2] = SOCKS5_RESERVED;
|
||
|
|
request[3] = addressType;
|
||
|
|
destAddr.CopyTo(request, 4);
|
||
|
|
destPort.CopyTo(request, 4 + destAddr.Length);
|
||
|
|
|
||
|
|
// send connect request.
|
||
|
|
stream.Write(request, 0, request.Length);
|
||
|
|
|
||
|
|
// PROXY SERVER RESPONSE
|
||
|
|
// +----+-----+-------+------+----------+----------+
|
||
|
|
// |VER | REP | RSV | ATYP | BND.ADDR | BND.PORT |
|
||
|
|
// +----+-----+-------+------+----------+----------+
|
||
|
|
// | 1 | 1 | X'00' | 1 | Variable | 2 |
|
||
|
|
// +----+-----+-------+------+----------+----------+
|
||
|
|
//
|
||
|
|
// * VER protocol version: X'05'
|
||
|
|
// * REP Reply field:
|
||
|
|
// * X'00' succeeded
|
||
|
|
// * X'01' general SOCKS server failure
|
||
|
|
// * X'02' connection not allowed by ruleset
|
||
|
|
// * X'03' Network unreachable
|
||
|
|
// * X'04' Host unreachable
|
||
|
|
// * X'05' Connection refused
|
||
|
|
// * X'06' TTL expired
|
||
|
|
// * X'07' Command not supported
|
||
|
|
// * X'08' Address itemType not supported
|
||
|
|
// * X'09' to X'FF' unassigned
|
||
|
|
//* RSV RESERVED
|
||
|
|
//* ATYP address itemType of following address
|
||
|
|
|
||
|
|
byte[] response = new byte[255];
|
||
|
|
|
||
|
|
// read proxy server response
|
||
|
|
stream.Read(response, 0, response.Length);
|
||
|
|
|
||
|
|
byte replyCode = response[1];
|
||
|
|
|
||
|
|
// evaluate the reply code for an error condition
|
||
|
|
if (replyCode != SOCKS5_CMD_REPLY_SUCCEEDED)
|
||
|
|
HandleProxyCommandError(response, destinationHost, destinationPort );
|
||
|
|
}
|
||
|
|
|
||
|
|
private void HandleProxyCommandError(byte[] response, string destinationHost, int destinationPort)
|
||
|
|
{
|
||
|
|
string proxyErrorText;
|
||
|
|
byte replyCode = response[1];
|
||
|
|
byte addrType = response[3];
|
||
|
|
string addr = "";
|
||
|
|
Int16 port = 0;
|
||
|
|
|
||
|
|
switch (addrType)
|
||
|
|
{
|
||
|
|
case SOCKS5_ADDRTYPE_DOMAIN_NAME:
|
||
|
|
int addrLen = Convert.ToInt32(response[4]);
|
||
|
|
byte[] addrBytes = new byte[addrLen];
|
||
|
|
for (int i = 0; i < addrLen; i++)
|
||
|
|
addrBytes[i] = response[i + 5];
|
||
|
|
addr = System.Text.ASCIIEncoding.ASCII.GetString(addrBytes);
|
||
|
|
byte[] portBytesDomain = new byte[2];
|
||
|
|
portBytesDomain[0] = response[6 + addrLen];
|
||
|
|
portBytesDomain[1] = response[5 + addrLen];
|
||
|
|
port = BitConverter.ToInt16(portBytesDomain, 0);
|
||
|
|
break;
|
||
|
|
|
||
|
|
case SOCKS5_ADDRTYPE_IPV4:
|
||
|
|
byte[] ipv4Bytes = new byte[4];
|
||
|
|
for (int i = 0; i < 4; i++)
|
||
|
|
ipv4Bytes[i] = response[i + 4];
|
||
|
|
IPAddress ipv4 = new IPAddress(ipv4Bytes);
|
||
|
|
addr = ipv4.ToString();
|
||
|
|
byte[] portBytesIpv4 = new byte[2];
|
||
|
|
portBytesIpv4[0] = response[9];
|
||
|
|
portBytesIpv4[1] = response[8];
|
||
|
|
port = BitConverter.ToInt16(portBytesIpv4, 0);
|
||
|
|
break;
|
||
|
|
|
||
|
|
case SOCKS5_ADDRTYPE_IPV6:
|
||
|
|
byte[] ipv6Bytes = new byte[16];
|
||
|
|
for (int i = 0; i < 16; i++)
|
||
|
|
ipv6Bytes[i] = response[i + 4];
|
||
|
|
IPAddress ipv6 = new IPAddress(ipv6Bytes);
|
||
|
|
addr = ipv6.ToString();
|
||
|
|
byte[] portBytesIpv6 = new byte[2];
|
||
|
|
portBytesIpv6[0] = response[21];
|
||
|
|
portBytesIpv6[1] = response[20];
|
||
|
|
port = BitConverter.ToInt16(portBytesIpv6, 0);
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
switch (replyCode)
|
||
|
|
{
|
||
|
|
case SOCKS5_CMD_REPLY_GENERAL_SOCKS_SERVER_FAILURE:
|
||
|
|
proxyErrorText = "a general socks destination failure occurred";
|
||
|
|
break;
|
||
|
|
case SOCKS5_CMD_REPLY_CONNECTION_NOT_ALLOWED_BY_RULESET:
|
||
|
|
proxyErrorText = "the connection is not allowed by proxy destination rule set";
|
||
|
|
break;
|
||
|
|
case SOCKS5_CMD_REPLY_NETWORK_UNREACHABLE:
|
||
|
|
proxyErrorText = "the network was unreachable";
|
||
|
|
break;
|
||
|
|
case SOCKS5_CMD_REPLY_HOST_UNREACHABLE:
|
||
|
|
proxyErrorText = "the host was unreachable";
|
||
|
|
break;
|
||
|
|
case SOCKS5_CMD_REPLY_CONNECTION_REFUSED:
|
||
|
|
proxyErrorText = "the connection was refused by the remote network";
|
||
|
|
break;
|
||
|
|
case SOCKS5_CMD_REPLY_TTL_EXPIRED:
|
||
|
|
proxyErrorText = "the time to live (TTL) has expired";
|
||
|
|
break;
|
||
|
|
case SOCKS5_CMD_REPLY_COMMAND_NOT_SUPPORTED:
|
||
|
|
proxyErrorText = "the command issued by the proxy client is not supported by the proxy destination";
|
||
|
|
break;
|
||
|
|
case SOCKS5_CMD_REPLY_ADDRESS_TYPE_NOT_SUPPORTED:
|
||
|
|
proxyErrorText = "the address type specified is not supported";
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
proxyErrorText = String.Format(CultureInfo.InvariantCulture, "that an unknown reply with the code value '{0}' was received by the destination", replyCode.ToString(CultureInfo.InvariantCulture));
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
string exceptionMsg = String.Format(CultureInfo.InvariantCulture, "The {0} concerning destination host {1} port number {2}. The destination reported the host as {3} port {4}.", proxyErrorText, destinationHost, destinationPort, addr, port.ToString(CultureInfo.InvariantCulture));
|
||
|
|
|
||
|
|
throw new ProxyException(exceptionMsg);
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
#region "Async Methods"
|
||
|
|
|
||
|
|
private BackgroundWorker _asyncWorker;
|
||
|
|
private Exception _asyncException;
|
||
|
|
bool _asyncCancelled;
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Gets a value indicating whether an asynchronous operation is running.
|
||
|
|
/// </summary>
|
||
|
|
/// <remarks>Returns true if an asynchronous operation is running; otherwise, false.
|
||
|
|
/// </remarks>
|
||
|
|
public bool IsBusy
|
||
|
|
{
|
||
|
|
get { return _asyncWorker == null ? false : _asyncWorker.IsBusy; }
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Gets a value indicating whether an asynchronous operation is cancelled.
|
||
|
|
/// </summary>
|
||
|
|
/// <remarks>Returns true if an asynchronous operation is cancelled; otherwise, false.
|
||
|
|
/// </remarks>
|
||
|
|
public bool IsAsyncCancelled
|
||
|
|
{
|
||
|
|
get { return _asyncCancelled; }
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Cancels any asychronous operation that is currently active.
|
||
|
|
/// </summary>
|
||
|
|
public void CancelAsync()
|
||
|
|
{
|
||
|
|
if (_asyncWorker != null && !_asyncWorker.CancellationPending && _asyncWorker.IsBusy)
|
||
|
|
{
|
||
|
|
_asyncCancelled = true;
|
||
|
|
_asyncWorker.CancelAsync();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
private void CreateAsyncWorker()
|
||
|
|
{
|
||
|
|
if (_asyncWorker != null)
|
||
|
|
_asyncWorker.Dispose();
|
||
|
|
_asyncException = null;
|
||
|
|
_asyncWorker = null;
|
||
|
|
_asyncCancelled = false;
|
||
|
|
_asyncWorker = new BackgroundWorker();
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Event handler for CreateConnectionAsync method completed.
|
||
|
|
/// </summary>
|
||
|
|
public event EventHandler<CreateConnectionAsyncCompletedEventArgs> CreateConnectionAsyncCompleted;
|
||
|
|
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Asynchronously creates a remote TCP connection through a proxy server to the destination host on the destination port.
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="destinationHost">Destination host name or IP address.</param>
|
||
|
|
/// <param name="destinationPort">Port number to connect to on the destination host.</param>
|
||
|
|
/// <returns>
|
||
|
|
/// Returns TcpClient object that can be used normally to communicate
|
||
|
|
/// with the destination server.
|
||
|
|
/// </returns>
|
||
|
|
/// <remarks>
|
||
|
|
/// This method instructs the proxy server
|
||
|
|
/// to make a pass through connection to the specified destination host on the specified
|
||
|
|
/// port.
|
||
|
|
/// </remarks>
|
||
|
|
public void CreateConnectionAsync(string destinationHost, int destinationPort)
|
||
|
|
{
|
||
|
|
if (_asyncWorker != null && _asyncWorker.IsBusy)
|
||
|
|
throw new InvalidOperationException("The Socks4 object is already busy executing another asynchronous operation. You can only execute one asychronous method at a time.");
|
||
|
|
|
||
|
|
CreateAsyncWorker();
|
||
|
|
_asyncWorker.WorkerSupportsCancellation = true;
|
||
|
|
_asyncWorker.DoWork += new DoWorkEventHandler(CreateConnectionAsync_DoWork);
|
||
|
|
_asyncWorker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(CreateConnectionAsync_RunWorkerCompleted);
|
||
|
|
Object[] args = new Object[2];
|
||
|
|
args[0] = destinationHost;
|
||
|
|
args[1] = destinationPort;
|
||
|
|
_asyncWorker.RunWorkerAsync(args);
|
||
|
|
}
|
||
|
|
|
||
|
|
private void CreateConnectionAsync_DoWork(object sender, DoWorkEventArgs e)
|
||
|
|
{
|
||
|
|
try
|
||
|
|
{
|
||
|
|
Object[] args = (Object[])e.Argument;
|
||
|
|
e.Result = CreateConnection((string)args[0], (int)args[1]);
|
||
|
|
}
|
||
|
|
catch (Exception ex)
|
||
|
|
{
|
||
|
|
_asyncException = ex;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
private void CreateConnectionAsync_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
|
||
|
|
{
|
||
|
|
if (CreateConnectionAsyncCompleted != null)
|
||
|
|
CreateConnectionAsyncCompleted(this, new CreateConnectionAsyncCompletedEventArgs(_asyncException, _asyncCancelled, (TcpClient)e.Result));
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
#endregion
|
||
|
|
}
|
||
|
|
}
|