示例#1
0
        public static SocketConnectionResult TryCreateTunnel(Socket socks5Socket, string destAddress, int destPort, ProxyInfo proxy, bool resolveHostnamesLocally)
        {
            try
            {
                // SEND HELLO
                socks5Socket.Send(BuildHelloMessage(proxy.Authenticate));

                // RECEIVE HELLO RESPONSE - HANDLE AUTHENTICATION
                byte[] buffer = new byte[255];
                if (socks5Socket.Receive(buffer) != 2)
                {
                    return(SocketConnectionResult.InvalidProxyResponse);
                }
                if (buffer[0] != SocksVersion)
                {
                    return(SocketConnectionResult.InvalidProxyResponse);
                }
                if (buffer[1] == (byte)Authentication.UsernamePassword)
                {
                    if (!proxy.Authenticate)
                    {
                        // Proxy server is requesting UserPass auth even tho we did not allow it
                        return(SocketConnectionResult.InvalidProxyResponse);
                    }
                    else
                    {
                        // We have to try and authenticate using the Username and Password
                        // https://tools.ietf.org/html/rfc1929
                        socks5Socket.Send(proxy.AuthenticationMessage);
                        if (socks5Socket.Receive(buffer) != 2)
                        {
                            return(SocketConnectionResult.InvalidProxyResponse);
                        }
                        if (buffer[0] != SubnegotiationVersion)
                        {
                            return(SocketConnectionResult.InvalidProxyResponse);
                        }
                        if (buffer[1] != 0)
                        {
                            return(SocketConnectionResult.AuthenticationError);
                        }
                    }
                }
                else if (buffer[1] != (byte)Authentication.NoAuthentication)
                {
                    return(SocketConnectionResult.AuthenticationError);
                }

                if (resolveHostnamesLocally && Helpers.GetAddressType(destAddress) == AddressType.DomainName)
                {
                    destAddress = destAddress.Resolve().ToString();
                }

                // SEND REQUEST
                socks5Socket.Send(BuildRequestMessage(Command.Connect, Helpers.GetAddressType(destAddress), destAddress, destPort));

                // RECEIVE RESPONSE
                int received = socks5Socket.Receive(buffer);
                if (received < 8)
                {
                    return(SocketConnectionResult.InvalidProxyResponse);
                }
                if (buffer[0] != SocksVersion)
                {
                    return(SocketConnectionResult.InvalidProxyResponse);
                }
                if (buffer[1] > 8)
                {
                    return(SocketConnectionResult.InvalidProxyResponse);
                }
                if (buffer[1] != 0)
                {
                    return((SocketConnectionResult)buffer[1]);
                }
                if (buffer[2] != 0)
                {
                    return(SocketConnectionResult.InvalidProxyResponse);
                }
                if (buffer[3] != 1 && buffer[3] != 3 && buffer[3] != 4)
                {
                    return(SocketConnectionResult.InvalidProxyResponse);
                }

                AddressType boundAddress = (AddressType)buffer[3];
                if (boundAddress == AddressType.IPv4)
                {
                    if (received != 10)
                    {
                        return(SocketConnectionResult.InvalidProxyResponse);
                    }
                }
                else if (boundAddress == AddressType.IPv6)
                {
                    if (received != 22)
                    {
                        return(SocketConnectionResult.InvalidProxyResponse);
                    }
                }
                else
                {
                    int domainLength = buffer[4];
                    if (received != 7 + domainLength)
                    {
                        return(SocketConnectionResult.InvalidProxyResponse);
                    }
                }

                return(SocketConnectionResult.OK);
            }
            catch (SocketException ex)
            {
                return(ex.ToConnectionResult());
            }
            catch
            {
                return(SocketConnectionResult.UnknownError);
            }
        }
示例#2
0
        public static SocketConnectionResult TryCreateTunnel(Socket socks5Socket, string destAddress, int destPort, ProxyInfo proxy, IDnsResolver dnsResolver = null)
        {
            try
            {
                // SEND HELLO
                byte[] SendByte = BuildHelloMessage(proxy.Authenticate);
                var    s        = "";
                for (var i = 1; i <= SendByte.Length; i++)
                {
                    s += SendByte[i - 1] + ",";
                }
                Console.WriteLine("[Socks5.cs]send:" + s);
                socks5Socket.Send(SendByte);

                // RECEIVE HELLO RESPONSE - HANDLE AUTHENTICATION
                byte[] GetByte = new byte[255];
                var    len     = socks5Socket.Receive(GetByte);
                Console.WriteLine("[Socks5.cs]len:" + len);
                if (len != 2)
                {
                    return(SocketConnectionResult.InvalidProxyResponse);
                }
                if (GetByte[0] != SocksVersion)
                {
                    return(SocketConnectionResult.InvalidProxyResponse);
                }
                if (GetByte[1] == (byte)Authentication.UsernamePassword)
                {
                    if (!proxy.Authenticate)
                    {
                        // Proxy server is requesting UserPass auth even tho we did not allow it
                        return(SocketConnectionResult.InvalidProxyResponse);
                    }
                    else
                    {
                        // We have to try and authenticate using the Username and Password
                        // https://tools.ietf.org/html/rfc1929
                        socks5Socket.Send(proxy.AuthenticationMessage);
                        if (socks5Socket.Receive(GetByte) != 2)
                        {
                            return(SocketConnectionResult.InvalidProxyResponse);
                        }
                        if (GetByte[0] != SubnegotiationVersion)
                        {
                            return(SocketConnectionResult.InvalidProxyResponse);
                        }
                        if (GetByte[1] != 0)
                        {
                            return(SocketConnectionResult.AuthenticationError);
                        }
                    }
                }
                else if (GetByte[1] != (byte)Authentication.NoAuthentication)
                {
                    return(SocketConnectionResult.AuthenticationError);
                }

                if (dnsResolver != null && Helpers.GetAddressType(destAddress) == AddressType.DomainName)
                {
                    var ipAddress = dnsResolver.TryResolve(destAddress);
                    if (ipAddress == null)
                    {
                        return(SocketConnectionResult.HostUnreachable);
                    }

                    destAddress = ipAddress.ToString();
                }

                // SEND REQUEST
                socks5Socket.Send(BuildRequestMessage(Command.Connect, Helpers.GetAddressType(destAddress), destAddress, destPort));

                // RECEIVE RESPONSE
                int received = socks5Socket.Receive(GetByte);
                if (received < 8)
                {
                    return(SocketConnectionResult.InvalidProxyResponse);
                }
                if (GetByte[0] != SocksVersion)
                {
                    return(SocketConnectionResult.InvalidProxyResponse);
                }
                if (GetByte[1] > 8)
                {
                    return(SocketConnectionResult.InvalidProxyResponse);
                }
                if (GetByte[1] != 0)
                {
                    return((SocketConnectionResult)GetByte[1]);
                }
                if (GetByte[2] != 0)
                {
                    return(SocketConnectionResult.InvalidProxyResponse);
                }
                if (GetByte[3] != 1 && GetByte[3] != 3 && GetByte[3] != 4)
                {
                    return(SocketConnectionResult.InvalidProxyResponse);
                }

                AddressType boundAddress = (AddressType)GetByte[3];
                if (boundAddress == AddressType.IPv4)
                {
                    if (received != 10)
                    {
                        return(SocketConnectionResult.InvalidProxyResponse);
                    }
                }
                else if (boundAddress == AddressType.IPv6)
                {
                    if (received != 22)
                    {
                        return(SocketConnectionResult.InvalidProxyResponse);
                    }
                }
                else
                {
                    int domainLength = GetByte[4];
                    if (received != 7 + domainLength)
                    {
                        return(SocketConnectionResult.InvalidProxyResponse);
                    }
                }

                return(SocketConnectionResult.OK);
            }
            catch (SocketException ex)
            {
                return(ex.ToConnectionResult());
            }
            catch
            {
                return(SocketConnectionResult.UnknownError);
            }
        }