# This file is part of Scapy
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# See http://www.secdev.org/projects/scapy for more informations
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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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"""A minimal implementation of the CANopen protocol, based on
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Wireshark dissectors. See https://wiki.wireshark.org/CANopen
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"""
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from scapy.config import conf
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from scapy.data import DLT_CAN_SOCKETCAN
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from scapy.fields import BitField, FieldLenField, FlagsField, StrLenField, \
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ThreeBytesField, XBitField
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from scapy.packet import Packet
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class CAN(Packet):
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"""A minimal implementation of the CANopen protocol, based on
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Wireshark dissectors. See https://wiki.wireshark.org/CANopen
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"""
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fields_desc = [
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FlagsField("flags", 0, 3, ["extended", "remote_transmission_request",
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"error"]),
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BitField("unknown", 0, 18),
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XBitField("identifier", 0, 11),
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FieldLenField("length", None, length_of="data", fmt="B"),
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ThreeBytesField("reserved", 0),
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StrLenField("data", "", length_from=lambda pkt: pkt.length),
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]
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conf.l2types.register(DLT_CAN_SOCKETCAN, CAN)
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