90 lines
3.8 KiB
Python
90 lines
3.8 KiB
Python
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# This file is part of Scapy
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# See http://www.secdev.org/projects/scapy for more information
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# Copyright (C) Philippe Biondi <phil@secdev.org>
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# This program is published under a GPLv2 license
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#############################################################################
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# #
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# hsrp.py --- HSRP protocol support for Scapy #
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# #
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# Copyright (C) 2010 Mathieu RENARD mathieu.renard(at)gmail.com #
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# #
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# This program is free software; you can redistribute it and/or modify it #
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# under the terms of the GNU General Public License version 2 as #
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# published by the Free Software Foundation; version 2. #
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# #
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# This program is distributed in the hope that it will be useful, but #
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# WITHOUT ANY WARRANTY; without even the implied warranty of #
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU #
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# General Public License for more details. #
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# #
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#############################################################################
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# HSRP Version 1
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# Ref. RFC 2281
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# HSRP Version 2
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# Ref. http://www.smartnetworks.jp/2006/02/hsrp_8_hsrp_version_2.html
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##
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# $Log: hsrp.py,v $
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# Revision 0.2 2011/05/01 15:23:34 mrenard
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# Cleanup code
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"""
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HSRP (Hot Standby Router Protocol): proprietary redundancy protocol for Cisco routers. # noqa: E501
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"""
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from scapy.fields import ByteEnumField, ByteField, IPField, SourceIPField, \
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StrFixedLenField, XIntField, XShortField
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from scapy.packet import Packet, bind_layers, bind_bottom_up
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from scapy.layers.inet import DestIPField, UDP
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from scapy.layers.inet6 import DestIP6Field
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class HSRP(Packet):
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name = "HSRP"
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fields_desc = [
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ByteField("version", 0),
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ByteEnumField("opcode", 0, {0: "Hello", 1: "Coup", 2: "Resign", 3: "Advertise"}), # noqa: E501
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ByteEnumField("state", 16, {0: "Initial", 1: "Learn", 2: "Listen", 4: "Speak", 8: "Standby", 16: "Active"}), # noqa: E501
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ByteField("hellotime", 3),
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ByteField("holdtime", 10),
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ByteField("priority", 120),
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ByteField("group", 1),
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ByteField("reserved", 0),
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StrFixedLenField("auth", b"cisco" + b"\00" * 3, 8),
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IPField("virtualIP", "192.168.1.1")]
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def guess_payload_class(self, payload):
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if self.underlayer.len > 28:
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return HSRPmd5
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else:
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return Packet.guess_payload_class(self, payload)
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class HSRPmd5(Packet):
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name = "HSRP MD5 Authentication"
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fields_desc = [
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ByteEnumField("type", 4, {4: "MD5 authentication"}),
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ByteField("len", None),
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ByteEnumField("algo", 0, {1: "MD5"}),
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ByteField("padding", 0x00),
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XShortField("flags", 0x00),
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SourceIPField("sourceip", None),
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XIntField("keyid", 0x00),
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StrFixedLenField("authdigest", b"\00" * 16, 16)]
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def post_build(self, p, pay):
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if self.len is None and pay:
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tmp_len = len(pay)
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p = p[:1] + hex(tmp_len)[30:] + p[30:]
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return p
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bind_bottom_up(UDP, HSRP, dport=1985)
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bind_bottom_up(UDP, HSRP, sport=1985)
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bind_bottom_up(UDP, HSRP, dport=2029)
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bind_bottom_up(UDP, HSRP, sport=2029)
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bind_layers(UDP, HSRP, dport=1985, sport=1985)
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bind_layers(UDP, HSRP, dport=2029, sport=2029)
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DestIPField.bind_addr(UDP, "224.0.0.2", dport=1985)
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DestIP6Field.bind_addr(UDP, "ff02::66", dport=2029)
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