Ejemplo n.º 1
0
        /// <summary>
        /// Performs the specified SOCKS5 request.
        /// </summary>
        /// <param name="request">The SOCKS5 request to issue to the server.</param>
        /// <returns>The SOCKS5 reply sent by the server.</returns>
        /// <exception cref="ArgumentNullException">The request parameter is
        /// null.</exception>
        /// <exception cref="ObjectDisposedException">The object has been
        /// disposed.</exception>
        /// <exception cref="Socks5Exception">The request could not be performed.
        /// Consult the InnerException property of the Socks5Exception to learn
        /// the reason.</exception>
        public SocksReply Request(SocksRequest request)
        {
            request.ThrowIfNull("request");
            AssertValid();
            try {
                byte[] bytes = request.Serialize();
                stream.Write(bytes, 0, bytes.Length);
                ByteBuilder b = new ByteBuilder();
                using (var r = new BinaryReader(stream, Encoding.UTF8, true)) {
                    bytes = r.ReadBytes(4);
                    b.Append(bytes);
                    ATyp atyp = (ATyp)bytes[3];
                    switch (atyp)
                    {
                    case ATyp.IPv4:
                    case ATyp.IPv6:
                        b.Append(r.ReadBytes(atyp == ATyp.IPv4 ? 4 : 16));
                        break;

                    case ATyp.Domain:
                        byte length = r.ReadByte();
                        b.Append(length).Append(r.ReadBytes(length));
                        break;
                    }
                    b.Append(r.ReadBytes(2));
                }
                return(SocksReply.Deserialize(b.ToArray()));
            } catch (Exception e) {
                throw new Socks5Exception("The request could not be performed.", e);
            }
        }
Ejemplo n.º 2
0
        /// <summary>
        /// Waits until the connected client sends a SOCKS5 request.
        /// </summary>
        /// <returns>The SOCKS5 request sent by the client.</returns>
        /// <exception cref="Socks5Exception">The data sent by the client
        /// is not a valid SOCKS5 request.</exception>
        SocksRequest WaitForRequest()
        {
            ByteBuilder b = new ByteBuilder();

            using (var r = new BinaryReader(stream, Encoding.UTF8, true)) {
                byte[] bytes = r.ReadBytes(4);
                b.Append(bytes);
                ATyp atyp = (ATyp)bytes[3];
                switch (atyp)
                {
                case ATyp.IPv4:
                case ATyp.IPv6:
                    b.Append(r.ReadBytes(atyp == ATyp.IPv4 ? 4 : 16));
                    break;

                case ATyp.Domain:
                    byte length = r.ReadByte();
                    b.Append(length).Append(r.ReadBytes(length));
                    break;
                }
                b.Append(r.ReadBytes(2));
            }
            try {
                return(SocksRequest.Deserialize(b.ToArray()));
            } catch (Exception e) {
                throw new Socks5Exception("The request could not be serialized.", e);
            }
        }
Ejemplo n.º 3
0
        /// <summary>
        /// Serializes the instance into an array of bytes.
        /// </summary>
        /// <returns>An array of bytes representing the instance of the
        /// ClientGreeting class.</returns>
        public byte[] Serialize()
        {
            ByteBuilder b = new ByteBuilder()
                            .Append(version)
                            .Append((byte)methods.Count);

            foreach (AuthMethod m in Methods)
            {
                b.Append((byte)m);
            }
            return(b.ToArray());
        }
Ejemplo n.º 4
0
        /// <summary>
        /// Performs the initial greeting.
        /// </summary>
        /// <exception cref="Socks5Exception">The client sent invalid data, or
        /// requires authentication.</exception>
        /// <exception cref="IOException">The stream could not be read, or the
        /// operation timed out.</exception>
        void PerformGreeting()
        {
            ByteBuilder b = new ByteBuilder();

            using (var r = new BinaryReader(stream, Encoding.UTF8, true)) {
                byte[] bytes = r.ReadBytes(2);
                b.Append(bytes);
                // The number of method-bytes following is contained in the second byte.
                b.Append(r.ReadBytes(bytes[1]));
            }
            ClientGreeting greeting = ClientGreeting.Deserialize(b.ToArray());

            // We only accept an authentication method of 'none'.
            if (!greeting.Methods.Contains(AuthMethod.None))
            {
                Dispose();
                throw new Socks5Exception("Client requires authentication.");
            }
            // Send back our greeting response.
            var response = new ServerGreeting(AuthMethod.None).Serialize();

            stream.Write(response, 0, response.Length);
        }