## This file is part of Scapy
|
## See http://www.secdev.org/projects/scapy for more informations
|
## Copyright (C) Philippe Biondi <phil@secdev.org>
|
## This program is published under a GPLv2 license
|
|
"""
|
RIP (Routing Information Protocol).
|
"""
|
|
from scapy.packet import *
|
from scapy.fields import *
|
from scapy.layers.inet import UDP
|
|
class RIP(Packet):
|
name = "RIP header"
|
fields_desc = [
|
ByteEnumField("cmd", 1, {1:"req", 2:"resp", 3:"traceOn", 4:"traceOff",
|
5:"sun", 6:"trigReq", 7:"trigResp", 8:"trigAck",
|
9:"updateReq", 10:"updateResp", 11:"updateAck"}),
|
ByteField("version", 1),
|
ShortField("null", 0),
|
]
|
|
def guess_payload_class(self, payload):
|
if payload[:2] == b"\xff\xff":
|
return RIPAuth
|
else:
|
return Packet.guess_payload_class(self, payload)
|
|
class RIPEntry(RIP):
|
name = "RIP entry"
|
fields_desc = [
|
ShortEnumField("AF", 2, {2:"IP"}),
|
ShortField("RouteTag", 0),
|
IPField("addr", "0.0.0.0"),
|
IPField("mask", "0.0.0.0"),
|
IPField("nextHop", "0.0.0.0"),
|
IntEnumField("metric", 1, {16:"Unreach"}),
|
]
|
|
class RIPAuth(Packet):
|
name = "RIP authentication"
|
fields_desc = [
|
ShortEnumField("AF", 0xffff, {0xffff:"Auth"}),
|
ShortEnumField("authtype", 2, {1:"md5authdata", 2:"simple", 3:"md5"}),
|
ConditionalField(StrFixedLenField("password", None, 16),
|
lambda pkt: pkt.authtype == 2),
|
ConditionalField(ShortField("digestoffset", 0),
|
lambda pkt: pkt.authtype == 3),
|
ConditionalField(ByteField("keyid", 0),
|
lambda pkt: pkt.authtype == 3),
|
ConditionalField(ByteField("authdatalen", 0),
|
lambda pkt: pkt.authtype == 3),
|
ConditionalField(IntField("seqnum", 0),
|
lambda pkt: pkt.authtype == 3),
|
ConditionalField(StrFixedLenField("zeropad", None, 8),
|
lambda pkt: pkt.authtype == 3),
|
ConditionalField(StrLenField("authdata", None,
|
length_from=lambda pkt: pkt.md5datalen),
|
lambda pkt: pkt.authtype == 1)
|
]
|
|
def pre_dissect(self, s):
|
if s[2:4] == b"\x00\x01":
|
self.md5datalen = len(s) - 4
|
|
return s
|
|
|
bind_layers( UDP, RIP, sport=520)
|
bind_layers( UDP, RIP, dport=520)
|
bind_layers( RIP, RIPEntry, )
|
bind_layers( RIPEntry, RIPEntry, )
|
bind_layers( RIPAuth, RIPEntry, )
|
