Exemple #1
0
        protected override void Decode(IChannelHandlerContext context, IByteBuffer input, List <object> output)
        {
            try
            {
                switch (State)
                {
                case Socks5CommandRequestDecoderState.Init:
                    var version = input.ReadByte();
                    if (version != (byte)SocksVersion.Socks5)
                    {
                        throw new DecoderException(
                                  "unsupported version: " + version + " (expected: " + SocksVersion.Socks5 + ')');
                    }

                    var type = Socks5CommandType.ValueOf(input.ReadByte());
                    input.SkipBytes(1);     // RSV
                    var dstAddrType = Socks5AddressType.ValueOf(input.ReadByte());
                    var dstAddr     = _addressDecoder.DecodeAddress(dstAddrType, input);
                    int dstPort     = input.ReadUnsignedShort();

                    output.Add(new DefaultSocks5CommandRequest(type, dstAddrType, dstAddr, dstPort));
                    Checkpoint(Socks5CommandRequestDecoderState.Success);
                    break;

                case Socks5CommandRequestDecoderState.Success:
                {
                    var readableBytes = ActualReadableBytes;
                    if (readableBytes > 0)
                    {
                        output.Add(input.ReadRetainedSlice(readableBytes));
                    }

                    break;
                }

                case Socks5CommandRequestDecoderState.Failure:
                {
                    input.SkipBytes(ActualReadableBytes);
                    break;
                }
                }
            }
            catch
            (Exception e)
            {
                Fail(output, e);
            }
        }
        public DefaultSocks5CommandRequest(
            Socks5CommandType type,
            Socks5AddressType dstAddrType,
            string dstAddr,
            int dstPort)
        {
            if (Equals(dstAddrType, Socks5AddressType.Pv4))
            {
                if (!IPAddress.TryParse(dstAddr, out _))
                {
                    throw new ArgumentException("dstAddr: " + dstAddr + " (expected: a valid IPv4 address)");
                }
            }
            else if (dstAddrType == Socks5AddressType.Domain)
            {
                dstAddr = Idn.GetAscii(dstAddr);
                if (dstAddr.Length > 255)
                {
                    throw new ArgumentException("dstAddr: " + dstAddr + " (expected: less than 256 chars)");
                }
            }
            else if (dstAddrType == Socks5AddressType.Pv6)
            {
                if (!IPAddress.TryParse(dstAddr, out _))
                {
                    throw new ArgumentException("dstAddr: " + dstAddr + " (expected: a valid IPv6 address");
                }
            }

            if (dstPort < 0 || dstPort > 65535)
            {
                throw new ArgumentException("dstPort: " + dstPort + " (expected: 0~65535)");
            }

            Type        = type;
            DstAddrType = dstAddrType;
            DstAddr     = dstAddr;
            DstPort     = dstPort;
        }