protected override void Decode(IChannelHandlerContext context, IByteBuffer input, List <object> output)
{
try
{
switch (State)
{
case Socks5CommandResponseDecoderState.Init:
var version = input.ReadByte();
if (version != (byte)SocksVersion.Socks5)
{
throw new DecoderException(
"unsupported version: " + version + " (expected: " + SocksVersion.Socks5 + ')');
}
var status = Socks5CommandStatus.ValueOf(input.ReadByte());
input.SkipBytes(1); // Reserved
var addrType = Socks5AddressType.ValueOf(input.ReadByte());
var addr = _addressDecoder.DecodeAddress(addrType, input);
int port = input.ReadUnsignedShort();
output.Add(new DefaultSocks5CommandResponse(status, addrType, addr, port));
Checkpoint(Socks5CommandResponseDecoderState.Success);
break;
case Socks5CommandResponseDecoderState.Success:
var readableBytes = ActualReadableBytes;
if (readableBytes > 0)
{
output.Add(input.ReadRetainedSlice(readableBytes));
}
break;
case Socks5CommandResponseDecoderState.Failure:
input.SkipBytes(ActualReadableBytes);
break;
}
}
catch (Exception e)
{
Fail(output, e);
}
}
public DefaultSocks5CommandResponse(
Socks5CommandStatus status,
Socks5AddressType bndAddrType,
string bndAddr = null,
int bndPort = 0)
{
if (bndAddr != null)
{
if (bndAddrType == Socks5AddressType.Pv4)
{
if (!IPAddress.TryParse(bndAddr, out _))
{
throw new ArgumentException("bndAddr: " + bndAddr + " (expected: a valid IPv4 address)");
}
}
else if (bndAddrType == Socks5AddressType.Domain)
{
bndAddr = Idn.GetAscii(bndAddr);
if (bndAddr.Length > 255)
{
throw new ArgumentException("bndAddr: " + bndAddr + " (expected: less than 256 chars)");
}
}
else if (bndAddrType == Socks5AddressType.Pv6)
{
if (!IPAddress.TryParse(bndAddr, out _))
{
throw new ArgumentException("bndAddr: " + bndAddr + " (expected: a valid IPv6 address)");
}
}
}
if (bndPort < 0 || bndPort > 65535)
{
throw new ArgumentException("bndPort: " + bndPort + " (expected: 0~65535)");
}
Status = status;
BndAddrType = bndAddrType;
BndAddr = bndAddr;
BndPort = bndPort;
}
