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esp32_bluetooth_classic_sni.../libs/scapy/contrib/lldp.py

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initial commit todo: add documentation & wireshark dissector
2021-08-31 11:51:03 +00:00
# scapy.contrib.description = Link Layer Discovery Protocol (LLDP)
# scapy.contrib.status = loads
"""
LLDP - Link Layer Discovery Protocol
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
:author: Thomas Tannhaeuser, hecke@naberius.de
:license: GPLv2
This module is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This module is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
:description:
This module provides Scapy layers for the LLDP protocol.
normative references:
- IEEE 802.1AB 2016 - LLDP protocol, topology and MIB description
:TODO:
- | organization specific TLV e.g. ProfiNet
| (see LLDPDUGenericOrganisationSpecific for a starting point)
- Ignore everything after EndofLLDPDUTLV
:NOTES:
- you can find the layer configuration options at the end of this file
- default configuration enforces standard conform:
* | frame structure
| (ChassisIDTLV/PortIDTLV/TimeToLiveTLV/...)
* multiplicity of TLVs (if given by the standard)
* min sizes of strings used by the TLVs
- conf.contribs['LLDP'].strict_mode_disable() -> disable strict mode
"""
from scapy.config import conf
from scapy.error import Scapy_Exception
from scapy.layers.l2 import Ether, Dot1Q
from scapy.fields import MACField, IPField, BitField, \
StrLenField, ByteEnumField, BitEnumField, \
EnumField, ThreeBytesField, BitFieldLenField, \
ShortField, XStrLenField, ByteField, ConditionalField, \
MultipleTypeField
from scapy.packet import Packet, bind_layers
from scapy.modules.six.moves import range
from scapy.data import ETHER_TYPES
from scapy.compat import orb
LLDP_NEAREST_BRIDGE_MAC = '01:80:c2:00:00:0e'
LLDP_NEAREST_NON_TPMR_BRIDGE_MAC = '01:80:c2:00:00:03'
LLDP_NEAREST_CUSTOMER_BRIDGE_MAC = '01:80:c2:00:00:00'
LLDP_ETHER_TYPE = 0x88cc
ETHER_TYPES['LLDP'] = LLDP_ETHER_TYPE
class LLDPInvalidFrameStructure(Scapy_Exception):
"""
basic frame structure not standard conform
(missing TLV, invalid order or multiplicity)
"""
pass
class LLDPMissingLowerLayer(Scapy_Exception):
"""
first layer below first LLDPDU must be Ethernet or Dot1q
"""
pass
class LLDPInvalidTLVCount(Scapy_Exception):
"""
invalid number of entries for a specific TLV type
"""
pass
class LLDPInvalidLengthField(Scapy_Exception):
"""
invalid value of length field
"""
pass
class LLDPDU(Packet):
"""
base class for all LLDP data units
"""
TYPES = {
0x00: 'end of LLDPDU',
0x01: 'chassis id',
0x02: 'port id',
0x03: 'time to live',
0x04: 'port description',
0x05: 'system name',
0x06: 'system description',
0x07: 'system capabilities',
0x08: 'management address',
range(0x09, 0x7e): 'reserved - future standardization',
127: 'organisation specific TLV'
}
DOT1Q_HEADER_LEN = 4
ETHER_HEADER_LEN = 14
ETHER_FSC_LEN = 4
ETHER_FRAME_MIN_LEN = 64
LAYER_STACK = []
LAYER_MULTIPLICITIES = {}
def guess_payload_class(self, payload):
# type is a 7-bit bitfield spanning bits 1..7 -> div 2
try:
lldpdu_tlv_type = orb(payload[0]) // 2
return LLDPDU_CLASS_TYPES.get(lldpdu_tlv_type, conf.raw_layer)
except IndexError:
return conf.raw_layer
@staticmethod
def _dot1q_headers_size(layer):
"""
calculate size of lower dot1q layers (if present)
:param layer: the layer to start at
:return: size of vlan headers, layer below lowest vlan header
"""
vlan_headers_size = 0
under_layer = layer
while under_layer and isinstance(under_layer, Dot1Q):
vlan_headers_size += LLDPDU.DOT1Q_HEADER_LEN
under_layer = under_layer.underlayer
return vlan_headers_size, under_layer
def post_build(self, pkt, pay):
under_layer = self.underlayer
if under_layer is None:
if conf.contribs['LLDP'].strict_mode():
raise LLDPMissingLowerLayer('No lower layer (Ethernet '
'or Dot1Q) provided.')
else:
return pkt + pay
if isinstance(under_layer, LLDPDU):
return pkt + pay
frame_size, under_layer = LLDPDU._dot1q_headers_size(under_layer)
if not under_layer or not isinstance(under_layer, Ether):
if conf.contribs['LLDP'].strict_mode():
raise LLDPMissingLowerLayer('No Ethernet layer provided.')
else:
return pkt + pay
frame_size += LLDPDU.ETHER_HEADER_LEN
frame_size += len(pkt) + len(pay) + LLDPDU.ETHER_FSC_LEN
if frame_size < LLDPDU.ETHER_FRAME_MIN_LEN:
return pkt + pay + b'\x00' * (LLDPDU.ETHER_FRAME_MIN_LEN - frame_size) # noqa: E501
return pkt + pay
@staticmethod
def _frame_structure_check(structure_description):
"""
check if the structure of the frame is conform to the basic
frame structure defined by the standard
:param structure_description: string-list reflecting LLDP-msg structure
"""
standard_frame_structure = [LLDPDUChassisID.__name__,
LLDPDUPortID.__name__,
LLDPDUTimeToLive.__name__,
'<...>']
if len(structure_description) < 3:
raise LLDPInvalidFrameStructure(
'Invalid frame structure.\ngot: {}\nexpected: '
'{}'.format(' '.join(structure_description),
' '.join(standard_frame_structure)))
for idx, layer_name in enumerate(standard_frame_structure):
if layer_name == '<...>':
break
if layer_name != structure_description[idx]:
raise LLDPInvalidFrameStructure(
'Invalid frame structure.\ngot: {}\nexpected: '
'{}'.format(' '.join(structure_description),
' '.join(standard_frame_structure)))
@staticmethod
def _tlv_multiplicities_check(tlv_type_count):
"""
check if multiplicity of present TLVs conforms to the standard
:param tlv_type_count: dict containing counte-per-TLV
"""
# * : 0..n, 1 : one and only one.
standard_multiplicities = {
LLDPDUEndOfLLDPDU.__name__: '*',
LLDPDUChassisID.__name__: 1,
LLDPDUPortID.__name__: 1,
LLDPDUTimeToLive.__name__: 1,
LLDPDUPortDescription: '*',
LLDPDUSystemName: '*',
LLDPDUSystemDescription: '*',
LLDPDUSystemCapabilities: '*',
LLDPDUManagementAddress: '*'
}
for tlv_type_name in standard_multiplicities:
standard_tlv_multiplicity = \
standard_multiplicities[tlv_type_name]
if standard_tlv_multiplicity == '*':
continue
try:
if tlv_type_count[tlv_type_name] != standard_tlv_multiplicity:
raise LLDPInvalidTLVCount(
'Invalid number of entries for TLV type '
'{} - expected {} entries, got '
'{}'.format(tlv_type_name,
standard_tlv_multiplicity,
tlv_type_count[tlv_type_name]))
except KeyError:
raise LLDPInvalidTLVCount('Missing TLV layer of type '
'{}.'.format(tlv_type_name))
def pre_dissect(self, s):
if conf.contribs['LLDP'].strict_mode():
if self.__class__.__name__ == 'LLDPDU':
LLDPDU.LAYER_STACK = []
LLDPDU.LAYER_MULTIPLICITIES = {}
else:
LLDPDU.LAYER_STACK.append(self.__class__.__name__)
try:
LLDPDU.LAYER_MULTIPLICITIES[self.__class__.__name__] += 1
except KeyError:
LLDPDU.LAYER_MULTIPLICITIES[self.__class__.__name__] = 1
return s
def dissection_done(self, pkt):
if self.__class__.__name__ == 'LLDPDU' and \
conf.contribs['LLDP'].strict_mode():
LLDPDU._frame_structure_check(LLDPDU.LAYER_STACK)
LLDPDU._tlv_multiplicities_check(LLDPDU.LAYER_MULTIPLICITIES)
super(LLDPDU, self).dissection_done(pkt)
def _check(self):
"""Overwrited by LLDPU objects"""
pass
def post_dissect(self, s):
self._check()
return super(LLDPDU, self).post_dissect(s)
def do_build(self):
self._check()
return super(LLDPDU, self).do_build()
def _ldp_id_adjustlen(pkt, x):
"""Return the length of the `id` field,
according to its real encoded type"""
f, v = pkt.getfield_and_val('id')
length = f.i2len(pkt, v) + 1
if (isinstance(pkt, LLDPDUPortID) and pkt.subtype == 0x4) or \
(isinstance(pkt, LLDPDUChassisID) and pkt.subtype == 0x5):
# Take the ConditionalField into account
length += 1
return length
class LLDPDUChassisID(LLDPDU):
"""
ieee 802.1ab-2016 - sec. 8.5.2 / p. 26
"""
LLDP_CHASSIS_ID_TLV_SUBTYPES = {
0x00: 'reserved',
0x01: 'chassis component',
0x02: 'interface alias',
0x03: 'port component',
0x04: 'MAC address',
0x05: 'network address',
0x06: 'interface name',
0x07: 'locally assigned',
range(0x08, 0xff): 'reserved'
}
SUBTYPE_RESERVED = 0x00
SUBTYPE_CHASSIS_COMPONENT = 0x01
SUBTYPE_INTERFACE_ALIAS = 0x02
SUBTYPE_PORT_COMPONENT = 0x03
SUBTYPE_MAC_ADDRESS = 0x04
SUBTYPE_NETWORK_ADDRESS = 0x05
SUBTYPE_INTERFACE_NAME = 0x06
SUBTYPE_LOCALLY_ASSIGNED = 0x07
fields_desc = [
BitEnumField('_type', 0x01, 7, LLDPDU.TYPES),
BitFieldLenField('_length', None, 9, length_of='id',
adjust=lambda pkt, x: _ldp_id_adjustlen(pkt, x)),
ByteEnumField('subtype', 0x00, LLDP_CHASSIS_ID_TLV_SUBTYPES),
ConditionalField(
ByteField('family', 0),
lambda pkt: pkt.subtype == 0x05
),
MultipleTypeField([
(
MACField('id', None),
lambda pkt: pkt.subtype == 0x04
),
(
IPField('id', None),
lambda pkt: pkt.subtype == 0x05
),
], StrLenField('id', '', length_from=lambda pkt: pkt._length - 1)
)
]
def _check(self):
"""
run layer specific checks
"""
if conf.contribs['LLDP'].strict_mode() and not self.id:
raise LLDPInvalidLengthField('id must be >= 1 characters long')
class LLDPDUPortID(LLDPDU):
"""
ieee 802.1ab-2016 - sec. 8.5.3 / p. 26
"""
LLDP_PORT_ID_TLV_SUBTYPES = {
0x00: 'reserved',
0x01: 'interface alias',
0x02: 'port component',
0x03: 'MAC address',
0x04: 'network address',
0x05: 'interface name',
0x06: 'agent circuit ID',
0x07: 'locally assigned',
range(0x08, 0xff): 'reserved'
}
SUBTYPE_RESERVED = 0x00
SUBTYPE_INTERFACE_ALIAS = 0x01
SUBTYPE_PORT_COMPONENT = 0x02
SUBTYPE_MAC_ADDRESS = 0x03
SUBTYPE_NETWORK_ADDRESS = 0x04
SUBTYPE_INTERFACE_NAME = 0x05
SUBTYPE_AGENT_CIRCUIT_ID = 0x06
SUBTYPE_LOCALLY_ASSIGNED = 0x07
fields_desc = [
BitEnumField('_type', 0x02, 7, LLDPDU.TYPES),
BitFieldLenField('_length', None, 9, length_of='id',
adjust=lambda pkt, x: _ldp_id_adjustlen(pkt, x)),
ByteEnumField('subtype', 0x00, LLDP_PORT_ID_TLV_SUBTYPES),
ConditionalField(
ByteField('family', 0),
lambda pkt: pkt.subtype == 0x04
),
MultipleTypeField([
(
MACField('id', None),
lambda pkt: pkt.subtype == 0x03
),
(
IPField('id', None),
lambda pkt: pkt.subtype == 0x04
),
], StrLenField('id', '', length_from=lambda pkt: pkt._length - 1)
)
]
def _check(self):
"""
run layer specific checks
"""
if conf.contribs['LLDP'].strict_mode() and not self.id:
raise LLDPInvalidLengthField('id must be >= 1 characters long')
class LLDPDUTimeToLive(LLDPDU):
"""
ieee 802.1ab-2016 - sec. 8.5.4 / p. 29
"""
fields_desc = [
BitEnumField('_type', 0x03, 7, LLDPDU.TYPES),
BitField('_length', 0x02, 9),
ShortField('ttl', 20)
]
def _check(self):
"""
run layer specific checks
"""
if conf.contribs['LLDP'].strict_mode() and self._length != 2:
raise LLDPInvalidLengthField('length must be 2 - got '
'{}'.format(self._length))
class LLDPDUEndOfLLDPDU(LLDPDU):
"""
ieee 802.1ab-2016 - sec. 8.5.1 / p. 26
"""
fields_desc = [
BitEnumField('_type', 0x00, 7, LLDPDU.TYPES),
BitField('_length', 0x00, 9),
]
def extract_padding(self, s):
return '', s
def _check(self):
"""
run layer specific checks
"""
if conf.contribs['LLDP'].strict_mode() and self._length != 0:
raise LLDPInvalidLengthField('length must be 0 - got '
'{}'.format(self._length))
class LLDPDUPortDescription(LLDPDU):
"""
ieee 802.1ab-2016 - sec. 8.5.5 / p. 29
"""
fields_desc = [
BitEnumField('_type', 0x04, 7, LLDPDU.TYPES),
BitFieldLenField('_length', None, 9, length_of='description'),
StrLenField('description', '', length_from=lambda pkt: pkt._length)
]
class LLDPDUSystemName(LLDPDU):
"""
ieee 802.1ab-2016 - sec. 8.5.6 / p. 30
"""
fields_desc = [
BitEnumField('_type', 0x05, 7, LLDPDU.TYPES),
BitFieldLenField('_length', None, 9, length_of='system_name'),
StrLenField('system_name', '', length_from=lambda pkt: pkt._length)
]
class LLDPDUSystemDescription(LLDPDU):
"""
ieee 802.1ab-2016 - sec. 8.5.7 / p. 31
"""
fields_desc = [
BitEnumField('_type', 0x06, 7, LLDPDU.TYPES),
BitFieldLenField('_length', None, 9, length_of='description'),
StrLenField('description', '', length_from=lambda pkt: pkt._length)
]
class LLDPDUSystemCapabilities(LLDPDU):
"""
ieee 802.1ab-2016 - sec. 8.5.8 / p. 31
"""
fields_desc = [
BitEnumField('_type', 0x07, 7, LLDPDU.TYPES),
BitFieldLenField('_length', 4, 9),
BitField('reserved_5_available', 0, 1),
BitField('reserved_4_available', 0, 1),
BitField('reserved_3_available', 0, 1),
BitField('reserved_2_available', 0, 1),
BitField('reserved_1_available', 0, 1),
BitField('two_port_mac_relay_available', 0, 1),
BitField('s_vlan_component_available', 0, 1),
BitField('c_vlan_component_available', 0, 1),
BitField('station_only_available', 0, 1),
BitField('docsis_cable_device_available', 0, 1),
BitField('telephone_available', 0, 1),
BitField('router_available', 0, 1),
BitField('wlan_access_point_available', 0, 1),
BitField('mac_bridge_available', 0, 1),
BitField('repeater_available', 0, 1),
BitField('other_available', 0, 1),
BitField('reserved_5_enabled', 0, 1),
BitField('reserved_4_enabled', 0, 1),
BitField('reserved_3_enabled', 0, 1),
BitField('reserved_2_enabled', 0, 1),
BitField('reserved_1_enabled', 0, 1),
BitField('two_port_mac_relay_enabled', 0, 1),
BitField('s_vlan_component_enabled', 0, 1),
BitField('c_vlan_component_enabled', 0, 1),
BitField('station_only_enabled', 0, 1),
BitField('docsis_cable_device_enabled', 0, 1),
BitField('telephone_enabled', 0, 1),
BitField('router_enabled', 0, 1),
BitField('wlan_access_point_enabled', 0, 1),
BitField('mac_bridge_enabled', 0, 1),
BitField('repeater_enabled', 0, 1),
BitField('other_enabled', 0, 1),
]
def _check(self):
"""
run layer specific checks
"""
if conf.contribs['LLDP'].strict_mode() and self._length != 4:
raise LLDPInvalidLengthField('length must be 4 - got '
'{}'.format(self._length))
class LLDPDUManagementAddress(LLDPDU):
"""
ieee 802.1ab-2016 - sec. 8.5.9 / p. 32
currently only 0x00..0x1e are used by standards, no way to
use anything > 0xff as management address subtype is only
one octet wide
see https://www.iana.org/assignments/address-family-numbers/address-family-numbers.xhtml # noqa: E501
"""
IANA_ADDRESS_FAMILY_NUMBERS = {
0x00: 'other',
0x01: 'IPv4',
0x02: 'IPv6',
0x03: 'NSAP',
0x04: 'HDLC',
0x05: 'BBN',
0x06: '802',
0x07: 'E.163',
0x08: 'E.164',
0x09: 'F.69',
0x0a: 'X.121',
0x0b: 'IPX',
0x0c: 'Appletalk',
0x0d: 'Decnet IV',
0x0e: 'Banyan Vines',
0x0f: 'E.164 with NSAP',
0x10: 'DNS',
0x11: 'Distinguished Name',
0x12: 'AS Number',
0x13: 'XTP over IPv4',
0x14: 'XTP over IPv6',
0x15: 'XTP native mode XTP',
0x16: 'Fiber Channel World-Wide Port Name',
0x17: 'Fiber Channel World-Wide Node Name',
0x18: 'GWID',
0x19: 'AFI for L2VPN',
0x1a: 'MPLS-TP Section Endpoint ID',
0x1b: 'MPLS-TP LSP Endpoint ID',
0x1c: 'MPLS-TP Pseudowire Endpoint ID',
0x1d: 'MT IP Multi-Topology IPv4',
0x1e: 'MT IP Multi-Topology IPv6'
}
SUBTYPE_MANAGEMENT_ADDRESS_OTHER = 0x00
SUBTYPE_MANAGEMENT_ADDRESS_IPV4 = 0x01
SUBTYPE_MANAGEMENT_ADDRESS_IPV6 = 0x02
SUBTYPE_MANAGEMENT_ADDRESS_NSAP = 0x03
SUBTYPE_MANAGEMENT_ADDRESS_HDLC = 0x04
SUBTYPE_MANAGEMENT_ADDRESS_BBN = 0x05
SUBTYPE_MANAGEMENT_ADDRESS_802 = 0x06
SUBTYPE_MANAGEMENT_ADDRESS_E_163 = 0x07
SUBTYPE_MANAGEMENT_ADDRESS_E_164 = 0x08
SUBTYPE_MANAGEMENT_ADDRESS_F_69 = 0x09
SUBTYPE_MANAGEMENT_ADDRESS_X_121 = 0x0A
SUBTYPE_MANAGEMENT_ADDRESS_IPX = 0x0B
SUBTYPE_MANAGEMENT_ADDRESS_APPLETALK = 0x0C
SUBTYPE_MANAGEMENT_ADDRESS_DECNET_IV = 0x0D
SUBTYPE_MANAGEMENT_ADDRESS_BANYAN_VINES = 0x0E
SUBTYPE_MANAGEMENT_ADDRESS_E_164_WITH_NSAP = 0x0F
SUBTYPE_MANAGEMENT_ADDRESS_DNS = 0x10
SUBTYPE_MANAGEMENT_ADDRESS_DISTINGUISHED_NAME = 0x11
SUBTYPE_MANAGEMENT_ADDRESS_AS_NUMBER = 0x12
SUBTYPE_MANAGEMENT_ADDRESS_XTP_OVER_IPV4 = 0x13
SUBTYPE_MANAGEMENT_ADDRESS_XTP_OVER_IPV6 = 0x14
SUBTYPE_MANAGEMENT_ADDRESS_XTP_NATIVE_MODE_XTP = 0x15
SUBTYPE_MANAGEMENT_ADDRESS_FIBER_CHANNEL_WORLD_WIDE_PORT_NAME = 0x16
SUBTYPE_MANAGEMENT_ADDRESS_FIBER_CHANNEL_WORLD_WIDE_NODE_NAME = 0x17
SUBTYPE_MANAGEMENT_ADDRESS_GWID = 0x18
SUBTYPE_MANAGEMENT_ADDRESS_AFI_FOR_L2VPN = 0x19
SUBTYPE_MANAGEMENT_ADDRESS_MPLS_TP_SECTION_ENDPOINT_ID = 0x1A
SUBTYPE_MANAGEMENT_ADDRESS_MPLS_TP_LSP_ENDPOINT_ID = 0x1B
SUBTYPE_MANAGEMENT_ADDRESS_MPLS_TP_PSEUDOWIRE_ENDPOINT_ID = 0x1C
SUBTYPE_MANAGEMENT_ADDRESS_MT_IP_MULTI_TOPOLOGY_IPV4 = 0x1D
SUBTYPE_MANAGEMENT_ADDRESS_MT_IP_MULTI_TOPOLOGY_IPV6 = 0x1E
INTERFACE_NUMBERING_SUBTYPES = {
0x01: 'unknown',
0x02: 'ifIndex',
0x03: 'system port number'
}
SUBTYPE_INTERFACE_NUMBER_UNKNOWN = 0x01
SUBTYPE_INTERFACE_NUMBER_IF_INDEX = 0x02
SUBTYPE_INTERFACE_NUMBER_SYSTEM_PORT_NUMBER = 0x03
'''
Note - calculation of _length field::
_length = 1@_management_address_string_length +
1@management_address_subtype +
management_address.len +
1@interface_numbering_subtype +
4@interface_number +
1@_oid_string_length +
object_id.len
'''
fields_desc = [
BitEnumField('_type', 0x08, 7, LLDPDU.TYPES),
BitFieldLenField('_length', None, 9, length_of='management_address',
adjust=lambda pkt, x:
8 + len(pkt.management_address) + len(pkt.object_id)),
BitFieldLenField('_management_address_string_length', None, 8,
length_of='management_address',
adjust=lambda pkt, x: len(pkt.management_address) + 1), # noqa: E501
ByteEnumField('management_address_subtype', 0x00,
IANA_ADDRESS_FAMILY_NUMBERS),
XStrLenField('management_address', '',
length_from=lambda pkt:
pkt._management_address_string_length - 1),
ByteEnumField('interface_numbering_subtype',
SUBTYPE_INTERFACE_NUMBER_UNKNOWN,
INTERFACE_NUMBERING_SUBTYPES),
BitField('interface_number', 0, 32),
BitFieldLenField('_oid_string_length', None, 8, length_of='object_id'),
XStrLenField('object_id', '',
length_from=lambda pkt: pkt._oid_string_length),
]
def _check(self):
"""
run layer specific checks
"""
if conf.contribs['LLDP'].strict_mode():
management_address_len = len(self.management_address)
if management_address_len == 0 or management_address_len > 31:
raise LLDPInvalidLengthField(
'management address must be 1..31 characters long - '
'got string of size {}'.format(management_address_len))
class ThreeBytesEnumField(EnumField, ThreeBytesField):
def __init__(self, name, default, enum):
EnumField.__init__(self, name, default, enum, "!I")
class LLDPDUGenericOrganisationSpecific(LLDPDU):
ORG_UNIQUE_CODE_PNO = 0x000ecf
ORG_UNIQUE_CODE_IEEE_802_1 = 0x0080c2
ORG_UNIQUE_CODE_IEEE_802_3 = 0x00120f
ORG_UNIQUE_CODE_TIA_TR_41_MED = 0x0012bb
ORG_UNIQUE_CODE_HYTEC = 0x30b216
ORG_UNIQUE_CODES = {
ORG_UNIQUE_CODE_PNO: "PROFIBUS International (PNO)",
ORG_UNIQUE_CODE_IEEE_802_1: "IEEE 802.1",
ORG_UNIQUE_CODE_IEEE_802_3: "IEEE 802.3",
ORG_UNIQUE_CODE_TIA_TR_41_MED: "TIA TR-41 Committee . Media Endpoint Discovery", # noqa: E501
ORG_UNIQUE_CODE_HYTEC: "Hytec Geraetebau GmbH"
}
fields_desc = [
BitEnumField('_type', 127, 7, LLDPDU.TYPES),
BitFieldLenField('_length', None, 9, length_of='data', adjust=lambda pkt, x: len(pkt.data) + 4), # noqa: E501
ThreeBytesEnumField('org_code', 0, ORG_UNIQUE_CODES),
ByteField('subtype', 0x00),
XStrLenField('data', '', length_from=lambda pkt: pkt._length - 4)
]
# 0x09 .. 0x7e is reserved for future standardization and for now treated as Raw() data # noqa: E501
LLDPDU_CLASS_TYPES = {
0x00: LLDPDUEndOfLLDPDU,
0x01: LLDPDUChassisID,
0x02: LLDPDUPortID,
0x03: LLDPDUTimeToLive,
0x04: LLDPDUPortDescription,
0x05: LLDPDUSystemName,
0x06: LLDPDUSystemDescription,
0x07: LLDPDUSystemCapabilities,
0x08: LLDPDUManagementAddress,
127: LLDPDUGenericOrganisationSpecific
}
class LLDPConfiguration(object):
"""
basic configuration for LLDP layer
"""
def __init__(self):
self._strict_mode = True
self.strict_mode_enable()
def strict_mode_enable(self):
"""
enable strict mode and dissector debugging
"""
self._strict_mode = True
def strict_mode_disable(self):
"""
disable strict mode and dissector debugging
"""
self._strict_mode = False
def strict_mode(self):
"""
get current strict mode state
"""
return self._strict_mode
conf.contribs['LLDP'] = LLDPConfiguration()
bind_layers(Ether, LLDPDU, type=LLDP_ETHER_TYPE)
bind_layers(Dot1Q, LLDPDU, type=LLDP_ETHER_TYPE)
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