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# coding: utf8
# This file is part of Scapy
# Scapy 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
# any later version.
#
# Scapy 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.
#
# You should have received a copy of the GNU General Public License
# along with Scapy. If not, see <http://www.gnu.org/licenses/>.
# scapy.contrib.description = ModBus Protocol
# scapy.contrib.status = loads
# Copyright (C) 2017 Arthur Gervais, Ken LE PRADO, Sébastien Mainand, Thomas Aurel # noqa: E501
import struct
from scapy.packet import Packet, bind_layers
from scapy.fields import XByteField, XShortField, StrLenField, ByteEnumField, \
BitFieldLenField, ByteField, ConditionalField, EnumField, FieldListField, \
ShortField, StrFixedLenField
from scapy.layers.inet import TCP
from scapy.utils import orb
from scapy.config import conf
from scapy.volatile import VolatileValue
# TODO: implement serial specific function codes
_modbus_exceptions = {1: "Illegal Function Code",
2: "Illegal Data Address",
3: "Illegal Data Value",
4: "Server Device Failure",
5: "Acknowledge",
6: "Server Device Busy",
8: "Memory Parity Error",
10: "Gateway Path Unavailable",
11: "Gateway Target Device Failed to Respond"}
class ModbusPDU01ReadCoilsRequest(Packet):
name = "Read Coils Request"
fields_desc = [XByteField("funcCode", 0x01),
XShortField("startAddr", 0x0000), # 0x0000 to 0xFFFF
XShortField("quantity", 0x0001)]
def extract_padding(self, s):
return b"", None
class ModbusPDU01ReadCoilsResponse(Packet):
name = "Read Coils Response"
fields_desc = [XByteField("funcCode", 0x01),
BitFieldLenField("byteCount", None, 8, count_of="coilStatus"), # noqa: E501
FieldListField("coilStatus", [0x00], ByteField("", 0x00), count_from=lambda pkt: pkt.byteCount)] # noqa: E501
def extract_padding(self, s):
return b"", None
class ModbusPDU01ReadCoilsError(Packet):
name = "Read Coils Exception"
fields_desc = [XByteField("funcCode", 0x81),
ByteEnumField("exceptCode", 1, _modbus_exceptions)]
def extract_padding(self, s):
return b"", None
class ModbusPDU02ReadDiscreteInputsRequest(Packet):
name = "Read Discrete Inputs"
fields_desc = [XByteField("funcCode", 0x02),
XShortField("startAddr", 0x0000),
XShortField("quantity", 0x0001)]
def extract_padding(self, s):
return b"", None
class ModbusPDU02ReadDiscreteInputsResponse(Packet):
""" inputStatus: result is represented as bytes, padded with 0 to have a
integer number of bytes. The field does not parse this result and
present the bytes directly
"""
name = "Read Discrete Inputs Response"
fields_desc = [XByteField("funcCode", 0x02),
BitFieldLenField("byteCount", None, 8, count_of="inputStatus"), # noqa: E501
FieldListField("inputStatus", [0x00], ByteField("", 0x00), count_from=lambda pkt: pkt.byteCount)] # noqa: E501
class ModbusPDU02ReadDiscreteInputsError(Packet):
name = "Read Discrete Inputs Exception"
fields_desc = [XByteField("funcCode", 0x82),
ByteEnumField("exceptCode", 1, _modbus_exceptions)]
class ModbusPDU03ReadHoldingRegistersRequest(Packet):
name = "Read Holding Registers"
fields_desc = [XByteField("funcCode", 0x03),
XShortField("startAddr", 0x0000),
XShortField("quantity", 0x0001)]
def extract_padding(self, s):
return b"", None
class ModbusPDU03ReadHoldingRegistersResponse(Packet):
name = "Read Holding Registers Response"
fields_desc = [XByteField("funcCode", 0x03),
BitFieldLenField("byteCount", None, 8, count_of="registerVal", adjust=lambda pkt, x: x * 2), # noqa: E501
FieldListField("registerVal", [0x0000], ShortField("", 0x0000), # noqa: E501
count_from=lambda pkt: pkt.byteCount)]
class ModbusPDU03ReadHoldingRegistersError(Packet):
name = "Read Holding Registers Exception"
fields_desc = [XByteField("funcCode", 0x83),
ByteEnumField("exceptCode", 1, _modbus_exceptions)]
class ModbusPDU04ReadInputRegistersRequest(Packet):
name = "Read Input Registers"
fields_desc = [XByteField("funcCode", 0x04),
XShortField("startAddr", 0x0000),
XShortField("quantity", 0x0001)]
def extract_padding(self, s):
return b"", None
class ModbusPDU04ReadInputRegistersResponse(Packet):
name = "Read Input Registers Response"
fields_desc = [XByteField("funcCode", 0x04),
BitFieldLenField("byteCount", None, 8, count_of="registerVal", adjust=lambda pkt, x: x * 2), # noqa: E501
FieldListField("registerVal", [0x0000], ShortField("", 0x0000), # noqa: E501
count_from=lambda pkt: pkt.byteCount)]
class ModbusPDU04ReadInputRegistersError(Packet):
name = "Read Input Registers Exception"
fields_desc = [XByteField("funcCode", 0x84),
ByteEnumField("exceptCode", 1, _modbus_exceptions)]
class ModbusPDU05WriteSingleCoilRequest(Packet):
name = "Write Single Coil"
fields_desc = [XByteField("funcCode", 0x05),
XShortField("outputAddr", 0x0000), # from 0x0000 to 0xFFFF
XShortField("outputValue", 0x0000)] # 0x0000 == Off, 0xFF00 == On # noqa: E501
class ModbusPDU05WriteSingleCoilResponse(Packet): # The answer is the same as the request if successful # noqa: E501
name = "Write Single Coil"
fields_desc = [XByteField("funcCode", 0x05),
XShortField("outputAddr", 0x0000), # from 0x0000 to 0xFFFF
XShortField("outputValue", 0x0000)] # 0x0000 == Off, 0xFF00 == On # noqa: E501
class ModbusPDU05WriteSingleCoilError(Packet):
name = "Write Single Coil Exception"
fields_desc = [XByteField("funcCode", 0x85),
ByteEnumField("exceptCode", 1, _modbus_exceptions)]
class ModbusPDU06WriteSingleRegisterRequest(Packet):
name = "Write Single Register"
fields_desc = [XByteField("funcCode", 0x06),
XShortField("registerAddr", 0x0000),
XShortField("registerValue", 0x0000)]
def extract_padding(self, s):
return b"", None
class ModbusPDU06WriteSingleRegisterResponse(Packet):
name = "Write Single Register Response"
fields_desc = [XByteField("funcCode", 0x06),
XShortField("registerAddr", 0x0000),
XShortField("registerValue", 0x0000)]
class ModbusPDU06WriteSingleRegisterError(Packet):
name = "Write Single Register Exception"
fields_desc = [XByteField("funcCode", 0x86),
ByteEnumField("exceptCode", 1, _modbus_exceptions)]
class ModbusPDU07ReadExceptionStatusRequest(Packet):
name = "Read Exception Status"
fields_desc = [XByteField("funcCode", 0x07)]
def extract_padding(self, s):
return b"", None
class ModbusPDU07ReadExceptionStatusResponse(Packet):
name = "Read Exception Status Response"
fields_desc = [XByteField("funcCode", 0x07),
XByteField("startAddr", 0x00)]
class ModbusPDU07ReadExceptionStatusError(Packet):
name = "Read Exception Status Exception"
fields_desc = [XByteField("funcCode", 0x87),
ByteEnumField("exceptCode", 1, _modbus_exceptions)]
class ModbusPDU0FWriteMultipleCoilsRequest(Packet):
name = "Write Multiple Coils"
fields_desc = [XByteField("funcCode", 0x0F),
XShortField("startAddr", 0x0000),
XShortField("quantityOutput", 0x0001),
BitFieldLenField("byteCount", None, 8, count_of="outputsValue"), # noqa: E501
FieldListField("outputsValue", [0x00], XByteField("", 0x00), count_from=lambda pkt: pkt.byteCount)] # noqa: E501
def extract_padding(self, s):
return b"", None
class ModbusPDU0FWriteMultipleCoilsResponse(Packet):
name = "Write Multiple Coils Response"
fields_desc = [XByteField("funcCode", 0x0F),
XShortField("startAddr", 0x0000),
XShortField("quantityOutput", 0x0001)]
class ModbusPDU0FWriteMultipleCoilsError(Packet):
name = "Write Multiple Coils Exception"
fields_desc = [XByteField("funcCode", 0x8F),
ByteEnumField("exceptCode", 1, _modbus_exceptions)]
class ModbusPDU10WriteMultipleRegistersRequest(Packet):
name = "Write Multiple Registers"
fields_desc = [XByteField("funcCode", 0x10),
XShortField("startAddr", 0x0000),
BitFieldLenField("quantityRegisters", None, 16, count_of="outputsValue",), # noqa: E501
BitFieldLenField("byteCount", None, 8, count_of="outputsValue", adjust=lambda pkt, x: x * 2), # noqa: E501
FieldListField("outputsValue", [0x0000], XShortField("", 0x0000), # noqa: E501
count_from=lambda pkt: pkt.byteCount)]
class ModbusPDU10WriteMultipleRegistersResponse(Packet):
name = "Write Multiple Registers Response"
fields_desc = [XByteField("funcCode", 0x10),
XShortField("startAddr", 0x0000),
XShortField("quantityRegisters", 0x0001)]
class ModbusPDU10WriteMultipleRegistersError(Packet):
name = "Write Multiple Registers Exception"
fields_desc = [XByteField("funcCode", 0x90),
ByteEnumField("exceptCode", 1, _modbus_exceptions)]
class ModbusPDU11ReportSlaveIdRequest(Packet):
name = "Report Slave Id"
fields_desc = [XByteField("funcCode", 0x11)]
def extract_padding(self, s):
return b"", None
class ModbusPDU11ReportSlaveIdResponse(Packet):
name = "Report Slave Id Response"
fields_desc = [XByteField("funcCode", 0x11),
BitFieldLenField("byteCount", None, 8, length_of="slaveId"),
ConditionalField(StrLenField("slaveId", "", length_from=lambda pkt: pkt.byteCount), # noqa: E501
lambda pkt: pkt.byteCount > 0),
ConditionalField(XByteField("runIdicatorStatus", 0x00), lambda pkt: pkt.byteCount > 0)] # noqa: E501
class ModbusPDU11ReportSlaveIdError(Packet):
name = "Report Slave Id Exception"
fields_desc = [XByteField("funcCode", 0x91),
ByteEnumField("exceptCode", 1, _modbus_exceptions)]
class ModbusReadFileSubRequest(Packet):
name = "Sub-request of Read File Record"
fields_desc = [ByteField("refType", 0x06),
ShortField("fileNumber", 0x0001),
ShortField("recordNumber", 0x0000),
ShortField("recordLength", 0x0001)]
def guess_payload_class(self, payload):
return ModbusReadFileSubRequest
class ModbusPDU14ReadFileRecordRequest(Packet):
name = "Read File Record"
fields_desc = [XByteField("funcCode", 0x14),
ByteField("byteCount", None)]
def guess_payload_class(self, payload):
if self.byteCount > 0:
return ModbusReadFileSubRequest
else:
return Packet.guess_payload_class(self, payload)
def post_build(self, p, pay):
if self.byteCount is None:
tmp_len = len(pay)
p = p[:1] + struct.pack("!B", tmp_len) + p[3:]
return p + pay
class ModbusReadFileSubResponse(Packet):
name = "Sub-response"
fields_desc = [BitFieldLenField("respLength", None, 8, count_of="recData", adjust=lambda pkt, p: p * 2 + 1), # noqa: E501
ByteField("refType", 0x06),
FieldListField("recData", [0x0000], XShortField("", 0x0000),
count_from=lambda pkt: (pkt.respLength - 1) // 2)] # noqa: E501
def guess_payload_class(self, payload):
return ModbusReadFileSubResponse
class ModbusPDU14ReadFileRecordResponse(Packet):
name = "Read File Record Response"
fields_desc = [XByteField("funcCode", 0x14),
ByteField("dataLength", None)]
def post_build(self, p, pay):
if self.dataLength is None:
tmp_len = len(pay)
p = p[:1] + struct.pack("!B", tmp_len) + p[3:]
return p + pay
def guess_payload_class(self, payload):
if self.dataLength > 0:
return ModbusReadFileSubResponse
else:
return Packet.guess_payload_class(self, payload)
class ModbusPDU14ReadFileRecordError(Packet):
name = "Read File Record Exception"
fields_desc = [XByteField("funcCode", 0x94),
ByteEnumField("exceptCode", 1, _modbus_exceptions)]
# 0x15 : Write File Record
class ModbusWriteFileSubRequest(Packet):
name = "Sub request of Write File Record"
fields_desc = [ByteField("refType", 0x06),
ShortField("fileNumber", 0x0001),
ShortField("recordNumber", 0x0000),
BitFieldLenField("recordLength", None, 16, length_of="recordData", adjust=lambda pkt, p: p // 2), # noqa: E501
FieldListField("recordData", [0x0000], ShortField("", 0x0000), # noqa: E501
length_from=lambda pkt: pkt.recordLength * 2)] # noqa: E501
def guess_payload_class(self, payload):
if payload:
return ModbusWriteFileSubRequest
class ModbusPDU15WriteFileRecordRequest(Packet):
name = "Write File Record"
fields_desc = [XByteField("funcCode", 0x15),
ByteField("dataLength", None)]
def post_build(self, p, pay):
if self.dataLength is None:
tmp_len = len(pay)
p = p[:1] + struct.pack("!B", tmp_len) + p[3:]
return p + pay
def guess_payload_class(self, payload):
if self.dataLength > 0:
return ModbusWriteFileSubRequest
else:
return Packet.guess_payload_class(self, payload)
class ModbusWriteFileSubResponse(ModbusWriteFileSubRequest):
name = "Sub response of Write File Record"
def guess_payload_class(self, payload):
if payload:
return ModbusWriteFileSubResponse
class ModbusPDU15WriteFileRecordResponse(ModbusPDU15WriteFileRecordRequest):
name = "Write File Record Response"
def guess_payload_class(self, payload):
if self.dataLength > 0:
return ModbusWriteFileSubResponse
else:
return Packet.guess_payload_class(self, payload)
class ModbusPDU15WriteFileRecordError(Packet):
name = "Write File Record Exception"
fields_desc = [XByteField("funcCode", 0x95),
ByteEnumField("exceptCode", 1, _modbus_exceptions)]
class ModbusPDU16MaskWriteRegisterRequest(Packet):
# and/or to 0xFFFF/0x0000 so that nothing is changed in memory
name = "Mask Write Register"
fields_desc = [XByteField("funcCode", 0x16),
XShortField("refAddr", 0x0000),
XShortField("andMask", 0xffff),
XShortField("orMask", 0x0000)]
class ModbusPDU16MaskWriteRegisterResponse(Packet):
name = "Mask Write Register Response"
fields_desc = [XByteField("funcCode", 0x16),
XShortField("refAddr", 0x0000),
XShortField("andMask", 0xffff),
XShortField("orMask", 0x0000)]
class ModbusPDU16MaskWriteRegisterError(Packet):
name = "Mask Write Register Exception"
fields_desc = [XByteField("funcCode", 0x96),
ByteEnumField("exceptCode", 1, _modbus_exceptions)]
class ModbusPDU17ReadWriteMultipleRegistersRequest(Packet):
name = "Read Write Multiple Registers"
fields_desc = [XByteField("funcCode", 0x17),
XShortField("readStartingAddr", 0x0000),
XShortField("readQuantityRegisters", 0x0001),
XShortField("writeStartingAddr", 0x0000),
BitFieldLenField("writeQuantityRegisters", None, 16, count_of="writeRegistersValue"), # noqa: E501
BitFieldLenField("byteCount", None, 8, count_of="writeRegistersValue", adjust=lambda pkt, x: x * 2), # noqa: E501
FieldListField("writeRegistersValue", [0x0000], XShortField("", 0x0000), # noqa: E501
count_from=lambda pkt: pkt.byteCount)]
class ModbusPDU17ReadWriteMultipleRegistersResponse(Packet):
name = "Read Write Multiple Registers Response"
fields_desc = [XByteField("funcCode", 0x17),
BitFieldLenField("byteCount", None, 8, count_of="registerVal", adjust=lambda pkt, x: x * 2), # noqa: E501
FieldListField("registerVal", [0x0000], ShortField("", 0x0000), # noqa: E501
count_from=lambda pkt: pkt.byteCount)]
class ModbusPDU17ReadWriteMultipleRegistersError(Packet):
name = "Read Write Multiple Exception"
fields_desc = [XByteField("funcCode", 0x97),
ByteEnumField("exceptCode", 1, _modbus_exceptions)]
class ModbusPDU18ReadFIFOQueueRequest(Packet):
name = "Read FIFO Queue"
fields_desc = [XByteField("funcCode", 0x18),
XShortField("FIFOPointerAddr", 0x0000)]
class ModbusPDU18ReadFIFOQueueResponse(Packet):
name = "Read FIFO Queue Response"
fields_desc = [XByteField("funcCode", 0x18),
# TODO: ByteCount must includes size of FIFOCount
BitFieldLenField("byteCount", None, 16, count_of="FIFOVal", adjust=lambda pkt, p: p * 2 + 2), # noqa: E501
BitFieldLenField("FIFOCount", None, 16, count_of="FIFOVal"),
FieldListField("FIFOVal", [], ShortField("", 0x0000), count_from=lambda pkt: pkt.byteCount)] # noqa: E501
class ModbusPDU18ReadFIFOQueueError(Packet):
name = "Read FIFO Queue Exception"
fields_desc = [XByteField("funcCode", 0x98),
ByteEnumField("exceptCode", 1, _modbus_exceptions)]
# TODO: not implemented, out of the main specification
# class ModbusPDU2B0DCANOpenGeneralReferenceRequest(Packet):
# name = "CANopen General Reference Request"
# fields_desc = []
#
#
# class ModbusPDU2B0DCANOpenGeneralReferenceResponse(Packet):
# name = "CANopen General Reference Response"
# fields_desc = []
#
#
# class ModbusPDU2B0DCANOpenGeneralReferenceError(Packet):
# name = "CANopen General Reference Error"
# fields_desc = []
# 0x2B/0x0E - Read Device Identification values
_read_device_id_codes = {1: "Basic",
2: "Regular",
3: "Extended",
4: "Specific"}
# 0x00->0x02: mandatory
# 0x03->0x06: optional
# 0x07->0x7F: Reserved (optional)
# 0x80->0xFF: product dependent private objects (optional)
_read_device_id_object_id = {0x00: "VendorName",
0x01: "ProductCode",
0x02: "MajorMinorRevision",
0x03: "VendorUrl",
0x04: "ProductName",
0x05: "ModelName",
0x06: "UserApplicationName"}
_read_device_id_conformity_lvl = {0x01: "Basic Identification (stream only)",
0x02: "Regular Identification (stream only)",
0x03: "Extended Identification (stream only)", # noqa: E501
0x81: "Basic Identification (stream and individual access)", # noqa: E501
0x82: "Regular Identification (stream and individual access)", # noqa: E501
0x83: "Extended Identification (stream and individual access)"} # noqa: E501
_read_device_id_more_follow = {0x00: "No",
0x01: "Yes"}
class ModbusPDU2B0EReadDeviceIdentificationRequest(Packet):
name = "Read Device Identification"
fields_desc = [XByteField("funcCode", 0x2B),
XByteField("MEIType", 0x0E),
ByteEnumField("readCode", 1, _read_device_id_codes),
ByteEnumField("objectId", 0x00, _read_device_id_object_id)]
class ModbusPDU2B0EReadDeviceIdentificationResponse(Packet):
name = "Read Device Identification"
fields_desc = [XByteField("funcCode", 0x2B),
XByteField("MEIType", 0x0E),
ByteEnumField("readCode", 4, _read_device_id_codes),
ByteEnumField("conformityLevel", 0x01, _read_device_id_conformity_lvl), # noqa: E501
ByteEnumField("more", 0x00, _read_device_id_more_follow),
ByteEnumField("nextObjId", 0x00, _read_device_id_object_id),
ByteField("objCount", 0x00)]
def guess_payload_class(self, payload):
if self.objCount > 0:
return ModbusObjectId
else:
return Packet.guess_payload_class(self, payload)
class ModbusPDU2B0EReadDeviceIdentificationError(Packet):
name = "Read Exception Status Exception"
fields_desc = [XByteField("funcCode", 0xAB),
ByteEnumField("exceptCode", 1, _modbus_exceptions)]
_reserved_funccode_request = {
0x08: '0x08 Unknown Reserved Request',
0x09: '0x09 Unknown Reserved Request',
0x0A: '0x0a Unknown Reserved Request',
0x0D: '0x0d Unknown Reserved Request',
0x0E: '0x0e Unknown Reserved Request',
0x29: '0x29 Unknown Reserved Request',
0x2A: '0x2a Unknown Reserved Request',
0x5A: 'Specific Schneider Electric Request',
0x5B: '0x5b Unknown Reserved Request',
0x7D: '0x7d Unknown Reserved Request',
0x7E: '0x7e Unknown Reserved Request',
0x7F: '0x7f Unknown Reserved Request',
}
_reserved_funccode_response = {
0x08: '0x08 Unknown Reserved Response',
0x09: '0x09 Unknown Reserved Response',
0x0A: '0x0a Unknown Reserved Response',
0x0D: '0x0d Unknown Reserved Response',
0x0E: '0x0e Unknown Reserved Response',
0x29: '0x29 Unknown Reserved Response',
0x2A: '0x2a Unknown Reserved Response',
0x5A: 'Specific Schneider Electric Response',
0x5B: '0x5b Unknown Reserved Response',
0x7D: '0x7d Unknown Reserved Response',
0x7E: '0x7e Unknown Reserved Response',
0x7F: '0x7f Unknown Reserved Response',
}
_reserved_funccode_error = {
0x88: '0x88 Unknown Reserved Error',
0x89: '0x89 Unknown Reserved Error',
0x8A: '0x8a Unknown Reserved Error',
0x8D: '0x8d Unknown Reserved Error',
0x8E: '0x8e Unknown Reserved Error',
0xA9: '0x88 Unknown Reserved Error',
0xAA: '0x88 Unknown Reserved Error',
0xDA: 'Specific Schneider Electric Error',
0xDB: '0xdb Unknown Reserved Error',
0xDC: '0xdc Unknown Reserved Error',
0xFD: '0xfd Unknown Reserved Error',
0xFE: '0xfe Unknown Reserved Error',
0xFF: '0xff Unknown Reserved Error',
}
class ModbusPDUReservedFunctionCodeRequest(Packet):
name = "Reserved Function Code Request"
fields_desc = [
ByteEnumField("funcCode", 0x00, _reserved_funccode_request),
StrFixedLenField('payload', '', 255), ]
def extract_padding(self, s):
return b"", None
def mysummary(self):
return self.sprintf("Modbus Reserved Request %funcCode%")
class ModbusPDUReservedFunctionCodeResponse(Packet):
name = "Reserved Function Code Response"
fields_desc = [
ByteEnumField("funcCode", 0x00, _reserved_funccode_response),
StrFixedLenField('payload', '', 255), ]
def extract_padding(self, s):
return b"", None
def mysummary(self):
return self.sprintf("Modbus Reserved Response %funcCode%")
class ModbusPDUReservedFunctionCodeError(Packet):
name = "Reserved Function Code Error"
fields_desc = [
ByteEnumField("funcCode", 0x00, _reserved_funccode_error),
StrFixedLenField('payload', '', 255), ]
def extract_padding(self, s):
return b"", None
def mysummary(self):
return self.sprintf("Modbus Reserved Error %funcCode%")
_userdefined_funccode_request = {
}
_userdefined_funccode_response = {
}
_userdefined_funccode_error = {
}
class ModbusByteEnumField(EnumField):
__slots__ = "defEnum"
def __init__(self, name, default, enum, defEnum):
EnumField.__init__(self, name, default, enum, "B")
defEnum = self.defEnum = defEnum
def i2repr_one(self, pkt, x):
if self not in conf.noenum and not isinstance(x, VolatileValue) \
and x in self.i2s:
return self.i2s[x]
if self.defEnum:
return self.defEnum
return repr(x)
class ModbusPDUUserDefinedFunctionCodeRequest(Packet):
name = "User-Defined Function Code Request"
fields_desc = [
ModbusByteEnumField(
"funcCode", 0x00, _userdefined_funccode_request,
"Unknown user-defined request function Code"),
StrFixedLenField('payload', '', 255), ]
def extract_padding(self, s):
return b"", None
def mysummary(self):
return self.sprintf("Modbus User-Defined Request %funcCode%")
class ModbusPDUUserDefinedFunctionCodeResponse(Packet):
name = "User-Defined Function Code Response"
fields_desc = [
ModbusByteEnumField(
"funcCode", 0x00, _userdefined_funccode_response,
"Unknown user-defined response function Code"),
StrFixedLenField('payload', '', 255), ]
def extract_padding(self, s):
return b"", None
def mysummary(self):
return self.sprintf("Modbus User-Defined Response %funcCode%")
class ModbusPDUUserDefinedFunctionCodeError(Packet):
name = "User-Defined Function Code Error"
fields_desc = [
ModbusByteEnumField(
"funcCode", 0x00, _userdefined_funccode_error,
"Unknown user-defined error function Code"),
StrFixedLenField('payload', '', 255), ]
def extract_padding(self, s):
return b"", None
def mysummary(self):
return self.sprintf("Modbus User-Defined Error %funcCode%")
class ModbusObjectId(Packet):
name = "Object"
fields_desc = [ByteEnumField("id", 0x00, _read_device_id_object_id),
BitFieldLenField("length", None, 8, length_of="value"),
StrLenField("value", "", length_from=lambda pkt: pkt.length)] # noqa: E501
def guess_payload_class(self, payload):
return ModbusObjectId
_modbus_request_classes = {
0x01: ModbusPDU01ReadCoilsRequest,
0x02: ModbusPDU02ReadDiscreteInputsRequest,
0x03: ModbusPDU03ReadHoldingRegistersRequest,
0x04: ModbusPDU04ReadInputRegistersRequest,
0x05: ModbusPDU05WriteSingleCoilRequest,
0x06: ModbusPDU06WriteSingleRegisterRequest,
0x07: ModbusPDU07ReadExceptionStatusRequest,
0x0F: ModbusPDU0FWriteMultipleCoilsRequest,
0x10: ModbusPDU10WriteMultipleRegistersRequest,
0x11: ModbusPDU11ReportSlaveIdRequest,
0x14: ModbusPDU14ReadFileRecordRequest,
0x15: ModbusPDU15WriteFileRecordRequest,
0x16: ModbusPDU16MaskWriteRegisterRequest,
0x17: ModbusPDU17ReadWriteMultipleRegistersRequest,
0x18: ModbusPDU18ReadFIFOQueueRequest,
}
_modbus_error_classes = {
0x81: ModbusPDU01ReadCoilsError,
0x82: ModbusPDU02ReadDiscreteInputsError,
0x83: ModbusPDU03ReadHoldingRegistersError,
0x84: ModbusPDU04ReadInputRegistersError,
0x85: ModbusPDU05WriteSingleCoilError,
0x86: ModbusPDU06WriteSingleRegisterError,
0x87: ModbusPDU07ReadExceptionStatusError,
0x8F: ModbusPDU0FWriteMultipleCoilsError,
0x90: ModbusPDU10WriteMultipleRegistersError,
0x91: ModbusPDU11ReportSlaveIdError,
0x94: ModbusPDU14ReadFileRecordError,
0x95: ModbusPDU15WriteFileRecordError,
0x96: ModbusPDU16MaskWriteRegisterError,
0x97: ModbusPDU17ReadWriteMultipleRegistersError,
0x98: ModbusPDU18ReadFIFOQueueError,
0xAB: ModbusPDU2B0EReadDeviceIdentificationError,
}
_modbus_response_classes = {
0x01: ModbusPDU01ReadCoilsResponse,
0x02: ModbusPDU02ReadDiscreteInputsResponse,
0x03: ModbusPDU03ReadHoldingRegistersResponse,
0x04: ModbusPDU04ReadInputRegistersResponse,
0x05: ModbusPDU05WriteSingleCoilResponse,
0x06: ModbusPDU06WriteSingleRegisterResponse,
0x07: ModbusPDU07ReadExceptionStatusResponse,
0x0F: ModbusPDU0FWriteMultipleCoilsResponse,
0x10: ModbusPDU10WriteMultipleRegistersResponse,
0x11: ModbusPDU11ReportSlaveIdResponse,
0x14: ModbusPDU14ReadFileRecordResponse,
0x15: ModbusPDU15WriteFileRecordResponse,
0x16: ModbusPDU16MaskWriteRegisterResponse,
0x17: ModbusPDU17ReadWriteMultipleRegistersResponse,
0x18: ModbusPDU18ReadFIFOQueueResponse,
}
_mei_types_request = {
0x0E: ModbusPDU2B0EReadDeviceIdentificationRequest,
# 0x0D: ModbusPDU2B0DCANOpenGeneralReferenceRequest,
}
_mei_types_response = {
0x0E: ModbusPDU2B0EReadDeviceIdentificationResponse,
# 0x0D: ModbusPDU2B0DCANOpenGeneralReferenceResponse,
}
class ModbusADURequest(Packet):
name = "ModbusADU"
fields_desc = [XShortField("transId", 0x0000), # needs to be unique
XShortField("protoId", 0x0000), # needs to be zero (Modbus)
ShortField("len", None), # is calculated with payload
XByteField("unitId", 0xff)] # 0xFF (recommended as non-significant value) or 0x00 # noqa: E501
def guess_payload_class(self, payload):
function_code = orb(payload[0])
if function_code == 0x2B:
sub_code = orb(payload[1])
try:
return _mei_types_request[sub_code]
except KeyError:
pass
try:
return _modbus_request_classes[function_code]
except KeyError:
pass
if function_code in _reserved_funccode_request:
return ModbusPDUReservedFunctionCodeRequest
return ModbusPDUUserDefinedFunctionCodeRequest
def post_build(self, p, pay):
if self.len is None:
tmp_len = len(pay) + 1 # +len(p)
p = p[:4] + struct.pack("!H", tmp_len) + p[6:]
return p + pay
class ModbusADUResponse(Packet):
name = "ModbusADU"
fields_desc = [XShortField("transId", 0x0000), # needs to be unique
XShortField("protoId", 0x0000), # needs to be zero (Modbus)
ShortField("len", None), # is calculated with payload
XByteField("unitId", 0xff)] # 0xFF or 0x00 should be used for Modbus over TCP/IP # noqa: E501
def guess_payload_class(self, payload):
function_code = orb(payload[0])
if function_code == 0x2B:
sub_code = orb(payload[1])
try:
return _mei_types_response[sub_code]
except KeyError:
pass
try:
return _modbus_response_classes[function_code]
except KeyError:
pass
try:
return _modbus_error_classes[function_code]
except KeyError:
pass
if function_code in _reserved_funccode_response:
return ModbusPDUReservedFunctionCodeResponse
elif function_code in _reserved_funccode_error:
return ModbusPDUReservedFunctionCodeError
if function_code < 0x80:
return ModbusPDUUserDefinedFunctionCodeResponse
return ModbusPDUUserDefinedFunctionCodeError
def post_build(self, p, pay):
if self.len is None:
tmp_len = len(pay) + 1 # +len(p)
p = p[:4] + struct.pack("!H", tmp_len) + p[6:]
return p + pay
bind_layers(TCP, ModbusADURequest, dport=502)
bind_layers(TCP, ModbusADUResponse, sport=502)
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