private static EndPoint Request(Socket socket, SocksRequestCommand command, EndPoint dstAddr)
{
socket.Send(CreateRequest(command, dstAddr));
byte[] response = new byte[262];
if (socket.Receive(response) < 10)
{
throw new SocksClientException("The connection was reset by the remote peer.");
}
if (response[0] != SOCKS_VERSION)
{
throw new SocksClientException("Socks version 5 is not supported by the proxy server.");
}
SocksReplyCode replyCode = (SocksReplyCode)response[1];
if (replyCode != SocksReplyCode.Succeeded)
{
throw new SocksClientException("Socks proxy server request failed: " + replyCode.ToString(), replyCode);
}
return(ParseEndpoint(response, 3));
}
private SocksEndPoint Request(Socket socket, SocksRequestCommand command, SocksEndPoint dstAddr)
{
socket.Send(dstAddr.CreateRequest(command));
byte[] response = new byte[262];
if (socket.Receive(response) < 10)
{
throw new SocksClientException("Invalid response received from proxy server.");
}
if (response[0] != SOCKS_VERSION)
{
throw new SocksClientException("Socks version 5 is not supported by the proxy server.");
}
SocksReplyCode reply = (SocksReplyCode)response[1];
if (reply != SocksReplyCode.Succeeded)
{
throw new SocksClientException("Socks proxy server request failed: " + reply.ToString());
}
return(new SocksEndPoint(response, 3));
}
private static byte[] CreateRequest(SocksRequestCommand command, EndPoint dstAddr)
{
//get type, address bytes & port bytes
SocksAddressType type;
byte[] address;
ushort port;
switch (dstAddr.AddressFamily)
{
case AddressFamily.InterNetwork:
{
type = SocksAddressType.IPv4Address;
IPEndPoint ep = dstAddr as IPEndPoint;
address = ep.Address.GetAddressBytes();
port = Convert.ToUInt16(ep.Port);
}
break;
case AddressFamily.InterNetworkV6:
{
type = SocksAddressType.IPv6Address;
IPEndPoint ep = dstAddr as IPEndPoint;
address = ep.Address.GetAddressBytes();
port = Convert.ToUInt16(ep.Port);
}
break;
case AddressFamily.Unspecified:
{
type = SocksAddressType.DomainName;
DomainEndPoint ep = dstAddr as DomainEndPoint;
address = ep.GetAddressBytes();
port = Convert.ToUInt16(ep.Port);
}
break;
default:
throw new NotSupportedException("AddressFamily not supported.");
}
//create request
byte[] request = new byte[address.Length + 6];
request[0] = SOCKS_VERSION;
request[1] = (byte)command;
request[3] = (byte)type;
Buffer.BlockCopy(address, 0, request, 4, address.Length);
byte[] portBytes = BitConverter.GetBytes(port);
Array.Reverse(portBytes);
Buffer.BlockCopy(portBytes, 0, request, 4 + address.Length, 2);
return(request);
}
internal byte[] CreateRequest(SocksRequestCommand command)
{
byte[] request = new byte[_address.Length + 6];
request[0] = SocksClient.SOCKS_VERSION;
request[1] = (byte)command;
request[3] = (byte)_type;
Buffer.BlockCopy(_address, 0, request, 4, _address.Length);
byte[] port = BitConverter.GetBytes(_port);
Array.Reverse(port);
Buffer.BlockCopy(port, 0, request, 4 + _address.Length, 2);
return(request);
}
