public static Socks5Request FormBytes(byte[] buffer)
{
var request = new Socks5Request
{
Version = buffer[0],
Command = buffer[1],
RSV = buffer[2],
};
request.Remote = SocksRemote.Parse(new Memory <byte>(buffer, 3, buffer.Length - 3), out var left);
return(request);
}
public static Socks5Response FromRequest(Socks5Request request, byte response, bool resolveRemote)
{
var resp = new Socks5Response
{
Version = request.Version,
Response = response,
RSV = request.RSV,
Remote = resolveRemote? request.Remote.Resolve() : request.Remote
};
return(resp);
}
public static Socks5Response FromRequest(Socks5Request request, IPEndPoint bindedEndPoint)
{
var resp = new Socks5Response
{
Version = request.Version,
Response = SocksResponse.SUCCESS,
RSV = request.RSV,
Remote = new SocksRemote()
{
AddressType = bindedEndPoint.AddressFamily == AddressFamily.InterNetworkV6 ? SocksAddressType.IPV6 : SocksAddressType.IPV4,
Address = AddressUtils.GetVaildLocalIpAddress(bindedEndPoint),
Port = (ushort)bindedEndPoint.Port,
}
};
return(resp);
}
protected async Task <Socks5Request> ReadRequest()
{
var header = await ReadBytes(5);
byte[] host;
if (header[3] == SocksAddressType.IPV4)
{
host = await ReadBytes(5);
}
else if (header[3] == SocksAddressType.IPV6)
{
host = await ReadBytes(17);
}
else
{
host = await ReadBytes(header[4] + 2);
}
return(Socks5Request.FormBytes(header.Concat(host).ToArray()));
}
private async Task <HostData> ProcessRequest()
{
_request = await ReadRequest();
if (_request.Command == SocksCommand.CONNECT)
{
_target = new HostData()
{
Address = _request.Remote.Address, Port = _request.Remote.Port
};
Logger.LogInformation($"Connecting to {_target}, {Id}");
return(_target);
}
else if (_request.Command == SocksCommand.UDP)
{
Logger.LogInformation($"Configing udp relay, {Id}");
_target = new HostData()
{
Address = _request.Remote.Address,
Port = _request.Remote.Port,
Type = RemoteType.Udp
};
BindUdp(_target);
return(_target);
}
var resp = Socks5Response.FromRequest(_request, SocksResponse.CANNOT_CONNECT, _supportPrivoxy);
var data = resp.ToBytes();
await WriteAsync(data);
await FlushAsync();
_pipe.Reader.Complete();
throw new SocksException("Command not supported");
}