# Copyright (c) 2006, Neville-Neil Consulting
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# File: $Id: localhost.py,v 1.1 2006/07/04 13:30:10 gnn Exp $
#
# Author: George V. Neville-Neil
#
# Description: A packet to handle localhost encoded tcpdump packets.

import socket
import pcs
from pcs.packets import ipv4
from pcs.packets import ipv6

class localhost(pcs.Packet):

    layout = pcs.Layout()

    def __init__(self, bytes = None):
        """initialize a localhost header, needed to read or write to lo0"""
        type = pcs.Field("type", 32)
        lolen = 4

        pcs.Packet.__init__(self, [type], bytes = bytes)
        self.description = "Localhost"

        if (bytes != None):
            self.data = self.next(bytes[lolen:len(bytes)])
        else:
            self.data = None

    def next(self, bytes):
        """Decode the type of a packet and return the correct higher
        level protocol object"""
        print self.type
        print socket.AF_INET6
        ## type is the address family, and NOT an ethertype 
        if self.type == socket.AF_INET:
            return ipv4.ipv4(bytes)
        if self.type == socket.AF_INET6:
            return ipv6.ipv6(bytes)
        return None