| ## 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, ) |
