84 lines
2.4 KiB
Python
84 lines
2.4 KiB
Python
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"""
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CLNS Extension
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~~~~~~~~~~~~~~~~~~~~~
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:copyright: 2014, 2015 BENOCS GmbH, Berlin (Germany)
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:author: Marcel Patzlaff, mpatzlaff@benocs.com
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:license: GPLv2
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This module is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This module is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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:description:
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This module provides a registration function and a generic PDU
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for OSI Connectionless-mode Network Services (such as IS-IS).
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"""
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from scapy.config import conf
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from scapy.fields import ByteEnumField, PacketField
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from scapy.layers.l2 import LLC
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from scapy.packet import Packet, bind_top_down, bind_bottom_up
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from scapy.compat import orb
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network_layer_protocol_ids = {
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0x00: "Null",
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0x08: "Q.933",
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0x80: "IEEE SNAP",
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0x81: "ISO 8438 CLNP",
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0x82: "ISO 9542 ES-IS",
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0x83: "ISO 10589 IS-IS",
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0x8E: "IPv6",
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0xB0: "FRF.9",
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0xB1: "FRF.12",
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0xC0: "TRILL",
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0xC1: "IEEE 802.aq",
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0xCC: "IPv4",
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0xCF: "PPP"
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}
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_cln_protocols = {}
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class _GenericClnsPdu(Packet):
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name = "Generic CLNS PDU"
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fields_desc = [
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ByteEnumField("nlpid", 0x00, network_layer_protocol_ids),
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PacketField("rawdata", None, conf.raw_layer)
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]
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def _create_cln_pdu(s, **kwargs):
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pdu_cls = conf.raw_layer
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if len(s) >= 1:
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nlpid = orb(s[0])
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pdu_cls = _cln_protocols.get(nlpid, _GenericClnsPdu)
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return pdu_cls(s, **kwargs)
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@conf.commands.register
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def register_cln_protocol(nlpid, cln_protocol_class):
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if nlpid is None or cln_protocol_class is None:
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return
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chk = _cln_protocols.get(nlpid, None)
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if chk is not None and chk != cln_protocol_class:
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raise ValueError("different protocol already registered!")
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_cln_protocols[nlpid] = cln_protocol_class
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bind_top_down(LLC, cln_protocol_class, dsap=0xfe, ssap=0xfe, ctrl=3)
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bind_top_down(LLC, _GenericClnsPdu, dsap=0xfe, ssap=0xfe, ctrl=3)
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bind_bottom_up(LLC, _create_cln_pdu, dsap=0xfe, ssap=0xfe, ctrl=3)
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