| Код | using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
/*
* zahmed
* Date 23 Jan 2004
* Socks 5 RFC is available at http://www.faqs.org/rfcs/rfc1928.html.
*/
namespace LMKR
{
public class ConnectionException : ApplicationException
{
public ConnectionException(string message)
: base(message)
{
}
}
/// <summary>
/// Provides sock5 functionality to clients (Connect only).
/// </summary>
public class SocksProxy
{
private SocksProxy()
{
}
#region ErrorMessages
private static string[] errorMsgs = {
"Operation completed successfully.",
"General SOCKS server failure.",
"Connection not allowed by ruleset.",
"Network unreachable.",
"Host unreachable.",
"Connection refused.",
"TTL expired.",
"Command not supported.",
"Address type not supported.",
"Unknown error."
};
#endregion
public static Socket ConnectToSocks5Proxy(string proxyAdress, ushort proxyPort, string destAddress, ushort destPort,
string userName, string password)
{
IPAddress destIP = null;
IPAddress proxyIP = null;
byte[] request = new byte[257];
byte[] response = new byte[257];
ushort nIndex;
try
{
proxyIP = IPAddress.Parse(proxyAdress);
}
catch (FormatException)
{ // get the IP address
proxyIP = Dns.GetHostByAddress(proxyAdress).AddressList[0];
}
// Parse destAddress (assume it in string dotted format "212.116.65.112" )
try
{
destIP = IPAddress.Parse(destAddress);
}
catch (FormatException)
{
// wrong assumption its in domain name format "www.microsoft.com"
}
IPEndPoint proxyEndPoint = new IPEndPoint(proxyIP, proxyPort);
// open a TCP connection to SOCKS server...
Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
s.Connect(proxyEndPoint);
nIndex = 0;
request[nIndex++] = 0x05; // Version 5.
request[nIndex++] = 0x02; // 2 Authentication methods are in packet...
request[nIndex++] = 0x00; // NO AUTHENTICATION REQUIRED
request[nIndex++] = 0x02; // USERNAME/PASSWORD
// Send the authentication negotiation request...
s.Send(request, nIndex, SocketFlags.None);
// Receive 2 byte response...
int nGot = s.Receive(response, 2, SocketFlags.None);
if (nGot != 2)
throw new ConnectionException("Bad response received from proxy server.");
if (response[1] == 0xFF)
{ // No authentication method was accepted close the socket.
s.Close();
throw new ConnectionException("None of the authentication method was accepted by proxy server.");
}
byte[] rawBytes;
if (/*response[1]==0x02*/true)
{//Username/Password Authentication protocol
nIndex = 0;
request[nIndex++] = 0x05; // Version 5.
// add user name
request[nIndex++] = (byte)userName.Length;
rawBytes = Encoding.Default.GetBytes(userName);
rawBytes.CopyTo(request, nIndex);
nIndex += (ushort)rawBytes.Length;
// add password
request[nIndex++] = (byte)password.Length;
rawBytes = Encoding.Default.GetBytes(password);
rawBytes.CopyTo(request, nIndex);
nIndex += (ushort)rawBytes.Length;
// Send the Username/Password request
s.Send(request, nIndex, SocketFlags.None);
// Receive 2 byte response...
nGot = s.Receive(response, 2, SocketFlags.None);
if (nGot != 2)
throw new ConnectionException("Bad response received from proxy server.");
if (response[1] != 0x00)
throw new ConnectionException("Bad Usernaem/Password.");
}
// This version only supports connect command.
// UDP and Bind are not supported.
// Send connect request now...
nIndex = 0;
request[nIndex++] = 0x05; // version 5.
request[nIndex++] = 0x01; // command = connect.
request[nIndex++] = 0x00; // Reserve = must be 0x00
if (destIP != null)
{// Destination adress in an IP.
switch (destIP.AddressFamily)
{
case AddressFamily.InterNetwork:
// Address is IPV4 format
request[nIndex++] = 0x01;
rawBytes = destIP.GetAddressBytes();
rawBytes.CopyTo(request, nIndex);
nIndex += (ushort)rawBytes.Length;
break;
case AddressFamily.InterNetworkV6:
// Address is IPV6 format
request[nIndex++] = 0x04;
rawBytes = destIP.GetAddressBytes();
rawBytes.CopyTo(request, nIndex);
nIndex += (ushort)rawBytes.Length;
break;
}
}
else
{// Dest. address is domain name.
request[nIndex++] = 0x03; // Address is full-qualified domain name.
request[nIndex++] = Convert.ToByte(destAddress.Length); // length of address.
rawBytes = Encoding.Default.GetBytes(destAddress);
rawBytes.CopyTo(request, nIndex);
nIndex += (ushort)rawBytes.Length;
}
// using big-edian byte order
byte[] portBytes = BitConverter.GetBytes(destPort);
for (int i = portBytes.Length - 1; i >= 0; i--)
request[nIndex++] = portBytes[i];
// send connect request.
s.Send(request, nIndex, SocketFlags.None);
s.Receive(response); // Get variable length response...
if (response[1] != 0x00)
throw new ConnectionException(errorMsgs[response[1]]);
// Success Connected...
return s;
}
}
} |
http://www.codeproject.com/cs/internet/zasocks5proxy.asp |
