1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
|
## This file is part of Scapy
## See http://www.secdev.org/projects/scapy for more informations
## Copyright (C) Philippe Biondi <phil@secdev.org>
## Copyright (C) 6WIND <olivier.matz@6wind.com>
## This program is published under a GPLv2 license
"""
VRRP (Virtual Router Redundancy Protocol).
"""
from scapy.packet import *
from scapy.fields import *
from scapy.layers.inet import IP
IPPROTO_VRRP=112
# RFC 3768 - Virtual Router Redundancy Protocol (VRRP)
class VRRP(Packet):
fields_desc = [
BitField("version" , 2, 4),
BitField("type" , 1, 4),
ByteField("vrid", 1),
ByteField("priority", 100),
FieldLenField("ipcount", None, count_of="addrlist", fmt="B"),
ByteField("authtype", 0),
ByteField("adv", 1),
XShortField("chksum", None),
FieldListField("addrlist", [], IPField("", "0.0.0.0"),
count_from = lambda pkt: pkt.ipcount),
IntField("auth1", 0),
IntField("auth2", 0) ]
def post_build(self, p, pay):
if self.chksum is None:
ck = checksum(p)
p = p[:6]+chr(ck>>8)+chr(ck&0xff)+p[8:]
return p
bind_layers( IP, VRRP, proto=IPPROTO_VRRP)
|
