/// <summary>
/// Creates a UDP association with native data types for transmission
/// </summary>
/// <param name="addressType"></param>
/// <param name="port"></param>
/// <param name="data"></param>
public PacketUDP(SOCKS5Protocol.ATYP addressType, IPAddress address, ushort port, byte[] data)
{
RSVx2 = SOCKS5Protocol.RSVx2;
ATYP = addressType;
ADDR = address.GetAddressBytes();
if (ATYP == SOCKS5Protocol.ATYP.IPV4 && ADDR.Length != 4)
{
throw new UDProxyException("Invalid UDP packet parameter: Incorrect IPv4 address length");
}
if (ATYP == SOCKS5Protocol.ATYP.IPV6 && ADDR.Length != 16)
{
throw new UDProxyException("Invalid UDP packet parameter: Incorrect IPv6 address length");
}
PORT = BitConverter.GetBytes(port);
DATA = data;
}
public PacketRequest(MemoryStream stream)
{
VER = (byte)stream.ReadByte();
CMD = (SOCKS5Protocol.CMD)stream.ReadByte();
RSV = (byte)stream.ReadByte();
ATYP = (SOCKS5Protocol.ATYP)stream.ReadByte();
// Get IP address
switch (ATYP)
{
case SOCKS5Protocol.ATYP.IPV4:
ADDR = new byte[4];
break;
case SOCKS5Protocol.ATYP.IPV6:
ADDR = new byte[16];
break;
case SOCKS5Protocol.ATYP.DOMAIN:
int bytes = stream.ReadByte();
ADDR = new byte[bytes];
break;
default:
ATYP = SOCKS5Protocol.ATYP.INVALID;
ADDR = new byte[4];
break;
}
stream.Read(ADDR, 0, ADDR.Length);
// Endian check (f*****g network byte order)
// When held in a received packet, port byte order is little endian
// When held in a reply/transmission packet, port byte order is big endian
stream.Read(PORT, 0, 2);
if (BitConverter.IsLittleEndian)
{
Array.Reverse(PORT);
}
stream.Close();
}
/// <summary>
/// Creates a UDP association packet from a received one
/// </summary>
/// <param name="stream"></param>
public PacketUDP(MemoryStream stream)
{
stream.Read(RSVx2, 0, 2);
FRAG = (byte)stream.ReadByte();
ATYP = (SOCKS5Protocol.ATYP)stream.ReadByte();
// TODO: Turn this into external logic plz
// Get IP address
switch (ATYP)
{
case SOCKS5Protocol.ATYP.IPV4:
ADDR = new byte[4];
break;
case SOCKS5Protocol.ATYP.IPV6:
ADDR = new byte[16];
break;
case SOCKS5Protocol.ATYP.DOMAIN:
int bytes = stream.ReadByte();
ADDR = new byte[bytes];
break;
default:
ATYP = SOCKS5Protocol.ATYP.INVALID;
ADDR = new byte[4];
break;
}
stream.Read(ADDR, 0, ADDR.Length);
stream.Read(PORT, 0, 2);
if (BitConverter.IsLittleEndian)
{
Array.Reverse(PORT);
}
// Trim the fat bitch!
DATA = new byte[(stream.Length - stream.Position)];
stream.Read(DATA, 0, DATA.Length);
stream.Close();
}
public PacketReplyRequest(PacketRequest packet)
{
if (packet.ATYP == SOCKS5Protocol.ATYP.INVALID)
{
// We were given an invalid ATYP, so no more processing.
REP = SOCKS5Protocol.REP.ILLEGAL_ADDRESS;
ATYP = SOCKS5Protocol.ATYP.INVALID;
throw new UDProxyException("Given an illegal address type.");
}
if (!Enum.IsDefined(typeof(SOCKS5Protocol.CMD), packet.CMD))
{
// We were given an invalid command, so no more processing
REP = SOCKS5Protocol.REP.ILLEGAL_COMMAND;
throw new UDProxyException("Given an illegal request command.");
}
ATYP = packet.ATYP;
ADDR = packet.ADDR;
// Our listening port for UDP, so the client knows where to transmit to
PORT = (ushort)UDProxy.gConfiguration.Config["ListenPort"];
}
public PacketUDP(SOCKS5Protocol.ATYP addressType, string domain, ushort port, byte[] data)
{
throw new NotImplementedException();
}
