File: hsrp.py

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

"""Cisco Hot Standby Router Protocol."""

import dpkt

# Opcodes
HELLO = 0
COUP = 1
RESIGN = 2

# States
INITIAL = 0x00
LEARN = 0x01
LISTEN = 0x02
SPEAK = 0x04
STANDBY = 0x08
ACTIVE = 0x10

class HSRP(dpkt.Packet):
    __hdr__ = (
        ('version', 'B', 0),
        ('opcode', 'B', 0),
        ('state', 'B', 0),
        ('hello', 'B', 0),
        ('hold', 'B', 0),
        ('priority', 'B', 0),
        ('group', 'B', 0),
        ('rsvd', 'B', 0),
        ('auth', '8s', 'cisco'),
        ('vip', '4s', '')
    )