public static async Task <StreamSocket> ConnectToSocks5Proxy(double timeout, StreamSocket s, DataWriter _dataWriter, DataReader _dataReader, string proxyAddress, ushort proxyPort, string destAddress, ushort destPort, string userName, string password)
{
var destIP = new HostName(destAddress);
var proxyIP = new HostName(proxyAddress);
var request = new byte[256];
var response = new byte[256];
ushort nIndex;
// open a TCP connection to SOCKS server...
//Connect(s, proxyEndPoint);
await s.ConnectAsync(proxyIP, proxyPort.ToString(CultureInfo.InvariantCulture)).WithTimeout(timeout);
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(_dataWriter, request, 0, nIndex);
var nGot = Receive(_dataReader, response, 0, response.Length);
// Receive 2 byte response...
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.Dispose();
throw new ConnectionException("None of the authentication method was accepted by proxy server.");
}
byte[] rawBytes;
//Username/Password Authentication protocol
if (response[1] == 0x02)
{
nIndex = 0;
request[nIndex++] = 0x01; // Version 5.
// add user name
request[nIndex++] = (byte)userName.Length;
rawBytes = Encoding.UTF8.GetBytes(userName);
rawBytes.CopyTo(request, nIndex);
nIndex += (ushort)rawBytes.Length;
// add password
request[nIndex++] = (byte)password.Length;
rawBytes = Encoding.UTF8.GetBytes(password);
rawBytes.CopyTo(request, nIndex);
nIndex += (ushort)rawBytes.Length;
// Send the Username/Password request
Send(_dataWriter, request, 0, nIndex);
nGot = Receive(_dataReader, response, 0, response.Length);
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
// Destination adress in an IP.
switch (destIP.Type)
{
case HostNameType.Ipv4:
// Address is IPV4 format
request[nIndex++] = 0x01;
rawBytes = destIP.GetAddressBytes();
rawBytes.CopyTo(request, nIndex);
nIndex += (ushort)rawBytes.Length;
break;
case HostNameType.Ipv6:
// Address is IPV6 format
request[nIndex++] = 0x04;
rawBytes = destIP.GetAddressBytes();
rawBytes.CopyTo(request, nIndex);
nIndex += (ushort)rawBytes.Length;
break;
//case HostNameType.DomainName:
// // 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.UTF8.GetBytes(destAddress);
// rawBytes.CopyTo(request, nIndex);
// nIndex += (ushort)rawBytes.Length;
// break;
}
// 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.
Send(_dataWriter, request, 0, nIndex);
nGot = Receive(_dataReader, response, 0, response.Length);
if (response[1] != 0x00)
{
throw new ConnectionException(errorMsgs[response[1]]);
}
// Success Connected...
return(s);
}
