/// <summary>
/// Create a pass through connection to the specified destination host.
/// </summary>
/// <see cref="ISocks"></see>
/// <param name="socket">The socket connected to the Socks Server</param>
/// <param name="destination">The destination host and port where the Socks Server have to Connect</param>
/// <param name="userId">User identification information</param>
public void CreateTunnel(Socket socket, Models.Sockets.SocketAddress destination, string userId = "")
{
if (socket == null)
{
throw new ArgumentNullException(nameof(socket), $"{nameof(socket)} has to be not null");
}
if (destination == null)
{
throw new ArgumentNullException(nameof(destination), $"{nameof(destination)} has to be not null");
}
var msg = BuildRequestMessage(destination.Host, destination.Port, userId);
socket.Send(msg);
var response = new byte[8];
socket.Receive(response);
if (response == null)
{
throw new ArgumentNullException(nameof(response), $"{nameof(response)} error");
}
ValidateRequestMessageResponse(response);
}
/// <summary>
/// Create a pass through connection to the specified destination host.
/// </summary>
/// <see cref="ISocks"></see>
/// <param name="socket">The socket connected to the Socks Server</param>
/// <param name="destinationAddress">The destination host and port where the Socks Server have to Connect</param>
/// <param name="proxyCredentials">The proxy credentials of the Socks Server</param>
public void CreateTunnel(Socket socket, Models.Sockets.SocketAddress destination, Credential proxyCredentials)
{
if (socket == null)
{
throw new ArgumentNullException(nameof(socket), $"{nameof(socket)} has to be not null");
}
if (destination == null)
{
throw new ArgumentNullException(nameof(destination), $"{nameof(destination)} has to be not null");
}
var auth = proxyCredentials != null;
var ngAuthMsg = BuildNeogtiateAuthenticationMessage(auth);
socket.Send(ngAuthMsg);
var ngAuthMsgByte = new byte[2];
if (socket.Receive(ngAuthMsgByte) != 2)
{
throw new Socks5Exception("Invalid response size. Negotiation message response for authentication must be 2 byte.");
}
VaidateNeogtiateAuthenticationMessageRespone(ngAuthMsgByte, auth);
if (auth)
{
var authMsg = BuildAuthenticationMessage(proxyCredentials.Username, proxyCredentials.Password);
socket.Send(authMsg);
var authMsgByte = new byte[2];
if (socket.Receive(authMsgByte) != 2)
{
throw new Socks5Exception("Invalid response size. Authentication message response must be 2 byte.");
}
VaidateAuthenticationMessageRespone(authMsgByte);
}
var addressType = GetAddressType(destination.Host);
var resolvedIp = destination.Host;
if (addressType == SOCKS5_ADDRTYPE_DOMAIN_NAME && Resolver != null)
{
if (Resolver.TryResolve(destination.Host, out var ipAddress))
{
resolvedIp = ipAddress.ToString();
}
else
{
throw new Socks5Exception("Destination address unreachable.");
}
}
var connectCmdMsg = BuildRequestMessage(SOCKS5_CMD_CONNECT, addressType, resolvedIp, destination.Port);
socket.Send(connectCmdMsg);
var connectCmdMsgByte = new byte[255];
var connectCmdMsgRecByte = socket.Receive(connectCmdMsgByte);
ValidateRequestMessageResponse(connectCmdMsgRecByte, connectCmdMsgByte);
}
