# $Id: dtp.py 23 2006-11-08 15:45:33Z dugsong $

"""Dynamic Trunking Protocol."""

import struct
from . import dpkt

class DTP(dpkt.Packet):
    __hdr__ = (
        ('v', 'B', 0),
        ) # rest is TLVs
    def unpack(self, buf):
        dpkt.Packet.unpack(self, buf)
        buf = self.data
        tvs = []
        while buf:
            t, l = struct.unpack('>HH', buf[:4])
            v, buf = buf[4:4+l], buf[4+l:]
            tvs.append((t, v))
        self.data = tvs

TRUNK_NAME = 0x01
MAC_ADDR = 0x04
