81 lines
2.9 KiB
Python
81 lines
2.9 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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RIP (Routing Information Protocol).
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"""
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from scapy.packet import Packet, bind_layers, bind_bottom_up
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from scapy.fields import ByteEnumField, ByteField, ConditionalField, \
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IPField, IntEnumField, IntField, ShortEnumField, ShortField, \
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StrFixedLenField, StrLenField
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from scapy.layers.inet import UDP
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class RIP(Packet):
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name = "RIP header"
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fields_desc = [
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ByteEnumField("cmd", 1, {1: "req", 2: "resp", 3: "traceOn", 4: "traceOff", # noqa: E501
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5: "sun", 6: "trigReq", 7: "trigResp", 8: "trigAck", # noqa: E501
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9: "updateReq", 10: "updateResp", 11: "updateAck"}), # noqa: E501
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ByteField("version", 1),
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ShortField("null", 0),
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]
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def guess_payload_class(self, payload):
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if payload[:2] == b"\xff\xff":
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return RIPAuth
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else:
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return Packet.guess_payload_class(self, payload)
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class RIPEntry(RIP):
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name = "RIP entry"
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fields_desc = [
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ShortEnumField("AF", 2, {2: "IP"}),
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ShortField("RouteTag", 0),
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IPField("addr", "0.0.0.0"),
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IPField("mask", "0.0.0.0"),
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IPField("nextHop", "0.0.0.0"),
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IntEnumField("metric", 1, {16: "Unreach"}),
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]
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class RIPAuth(Packet):
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name = "RIP authentication"
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fields_desc = [
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ShortEnumField("AF", 0xffff, {0xffff: "Auth"}),
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ShortEnumField("authtype", 2, {1: "md5authdata", 2: "simple", 3: "md5"}), # noqa: E501
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ConditionalField(StrFixedLenField("password", None, 16),
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lambda pkt: pkt.authtype == 2),
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ConditionalField(ShortField("digestoffset", 0),
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lambda pkt: pkt.authtype == 3),
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ConditionalField(ByteField("keyid", 0),
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lambda pkt: pkt.authtype == 3),
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ConditionalField(ByteField("authdatalen", 0),
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lambda pkt: pkt.authtype == 3),
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ConditionalField(IntField("seqnum", 0),
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lambda pkt: pkt.authtype == 3),
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ConditionalField(StrFixedLenField("zeropad", None, 8),
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lambda pkt: pkt.authtype == 3),
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ConditionalField(StrLenField("authdata", None,
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length_from=lambda pkt: pkt.md5datalen),
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lambda pkt: pkt.authtype == 1)
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]
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def pre_dissect(self, s):
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if s[2:4] == b"\x00\x01":
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self.md5datalen = len(s) - 4
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return s
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bind_bottom_up(UDP, RIP, dport=520)
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bind_bottom_up(UDP, RIP, sport=520)
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bind_layers(UDP, RIP, sport=520, dport=520)
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bind_layers(RIP, RIPEntry,)
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bind_layers(RIPEntry, RIPEntry,)
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bind_layers(RIPAuth, RIPEntry,)
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