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slavesys.py
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from threading import Thread
from protocol import *
from system.exceptions import *
from system import colors
class Slave(Thread):
def __init__(self, configuration):
Thread.__init__(self)
self.Configuration = configuration
self.Connections = []
def run(self):
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.bind((self.Configuration.Address, self.Configuration.Port))
s.listen(5)
# while not self.shutdown_flag.is_set():
try:
while True:
print("Slave listening for connections in %s : %d" % (self.Configuration.Address, self.Configuration.Port))
cnx, addr = s.accept()
ch = ConnectionHandler(self.Configuration, cnx, addr)
ch.start()
# TODO: del
self.Connections.append(ch)
except Exception as ex:
print("Exception: %s " % str(ex))
finally:
for i in self.Connections:
i.join()
s.close()
class ConnectionHandler(Thread):
def __init__(self, configuration, cnx, addr):
Thread.__init__(self)
self.Configuration = configuration
self.cnx = cnx
print("Created connection handler to %s : %s" % (str(addr[0]), str(addr[1])))
self.addr = addr
def run(self):
try:
while True:
data = self.cnx.recv(1024) # OPTIMIZE: lower buffer = faster
if not data:
break
# TODO: chech for not Modbus Packets
pkt = ModbusADU(data)
response = self.__get_answer(pkt)
if response:
self.cnx.sendto(bytes(response), (self.addr[0], self.addr[1]))
else:
continue
except OSError:
print("Connection closed.")
self.cnx.close()
except ConnectionResetError:
self.cnx.close()
def __get_answer(self, modbus_packet):
"""
Gets the requested Modbus answer.
:param modbus_packet:
:return:
"""
modbus_exception = self.__validate_function_code(modbus_packet)
if modbus_exception:
return modbus_exception
# READ COILS
if isinstance(modbus_packet.payload, ModbusPDU01ReadCoils):
try:
coil_status = modbus_packet.payload.process(
datablock=self.Configuration.coils_table, coilsmask=self.Configuration.CoilsMask)
if modbus_packet.payload.startAddr == 2:
print("[*] Response Address %d , value %s " % (modbus_packet.payload.startAddr, str(coil_status)))
pdu = ModbusPDU01ReadCoilsAnswer(coilStatus=coil_status, byteCount=len(coil_status))
adu = ModbusADU(len=len(pdu) + 1, transId=modbus_packet.transId)
except ModbusException as ex:
# Create ModbusException response packet
adu = ModbusADU(len=3, transId=modbus_packet.transId)
pdu = ModbusPDUGenericException(funcCode=modbus_packet.funcCode + 128, exceptCode=ex.exception_code)
return adu / pdu
# READ DISCRETE INPUTS
elif isinstance(modbus_packet.payload, ModbusPDU02ReadDiscreteInputs):
try:
input_status = modbus_packet.payload.process(
datablock=self.Configuration.discrete_inputs_table, discrete_inputs_mask=self.Configuration.DiscreteInputsMask)
pdu = ModbusPDU02ReadDiscreteInputsAnswer(inputStatus=input_status, byteCount=len(input_status))
adu = ModbusADU(len=len(pdu) + 1, transId=modbus_packet.transId)
except ModbusException as ex:
# Create ModbusException response packet
adu = ModbusADU(len=3, transId=modbus_packet.transId)
pdu = ModbusPDUGenericException(funcCode=modbus_packet.funcCode + 128, exceptCode=ex.exception_code)
return adu / pdu
# READ HOLDING REGISTERS
elif isinstance(modbus_packet.payload, ModbusPDU03ReadHoldingRegisters):
try:
registers_status = modbus_packet.payload.process(
datablock=self.Configuration.holding_registers_table,
holding_registers_mask=self.Configuration.HoldingRegistersMask)
pdu = ModbusPDU03ReadHoldingRegistersAnswer(registerVal=registers_status, byteCount=len(registers_status))
adu = ModbusADU(len=len(pdu) + 1, transId=modbus_packet.transId)
except ModbusException as ex:
# Create ModbusException response packet
adu = ModbusADU(len=3, transId=modbus_packet.transId)
pdu = ModbusPDUGenericException(funcCode=modbus_packet.funcCode + 128, exceptCode=ex.exception_code)
return adu / pdu
# READ INPUT REGISTERS
elif isinstance(modbus_packet.payload, ModbusPDU04ReadInputRegisters):
try:
registers_status = modbus_packet.payload.process(
datablock=self.Configuration.input_registers_table,
input_registers_mask=self.Configuration.InputRegistersMask)
pdu = ModbusPDU04ReadInputRegistersAnswer(registerVal=registers_status, byteCount=len(registers_status))
adu = ModbusADU(len=len(pdu) + 1, transId=modbus_packet.transId)
except ModbusException as ex:
# Create ModbusException response packet
adu = ModbusADU(len=3, transId=modbus_packet.transId)
pdu = ModbusPDUGenericException(funcCode=modbus_packet.funcCode + 128, exceptCode=ex.exception_code)
return adu / pdu
# WRITE SINGLE COIL
elif isinstance(modbus_packet.payload, ModbusPDU05WriteSingleCoil):
try:
modbus_packet.payload.process(datablock=self.Configuration.coils_table, coils_mask=self.Configuration.CoilsMask)
# If goes OK, return an echo of request packet
return modbus_packet
except ModbusException as ex:
# Create ModbusException response packet
adu = ModbusADU(len=3, transId=modbus_packet.transId)
pdu = ModbusPDUGenericException(funcCode=modbus_packet.funcCode + 128, exceptCode=ex.exception_code)
return adu / pdu
elif isinstance(modbus_packet.payload, ModbusPDU06WriteSingleRegister):
try:
modbus_packet.payload.process(datablock=self.Configuration.holding_registers_table,
holding_registers_mask=self.Configuration.HoldingRegistersMask)
# If goes OK, return an echo of request packet
return modbus_packet
except ModbusException as ex:
adu = ModbusADU(len=3, transId=modbus_packet.transId)
pdu = ModbusPDUGenericException(funcCode=modbus_packet.funcCode + 128, exceptCode=ex.exception_code)
return adu/pdu
elif isinstance(modbus_packet.payload, ModbusPDU0FWriteMultipleCoils):
try:
modbus_packet.payload.process(datablock=self.Configuration.coils_table, coils_mask=self.Configuration.CoilsMask)
pdu = ModbusPDU0FWriteMultipleCoilsAnswer(startingAddr=modbus_packet.payload.startingAddr,
quantityOutput=modbus_packet.payload.quantityOutput)
adu = ModbusADU(len=len(pdu)+1, transId=modbus_packet.transId)
except SlaveDeviceFailure as ex:
print("[*]" + colors.bold + colors.fg.red + " System Failure while writting multiple coils: "
+ ex.message)
print("[*]" + colors.bold + colors.fg.red + " A ModbusException has sent with Exception code 04."
+ colors.reset)
adu = ModbusADU(len=3, transId=modbus_packet.transId)
pdu = ModbusPDUGenericException(funcCode=modbus_packet.funcCode + 128, exceptCode=ex.exception_code)
except ModbusException as ex:
adu = ModbusADU(len=3, transId=modbus_packet.transId)
pdu = ModbusPDUGenericException(funcCode=modbus_packet.funcCode + 128, exceptCode=ex.exception_code)
return adu / pdu
# TODO: All type of answers
else:
print("Unknown Function Code received.")
adu = ModbusADU(len=3, transId=modbus_packet.transId)
data = binascii.hexlify(bytes(modbus_packet.payload))
function_code = int(data[0:1], 16)
# TODO: Exception with requested function code + 127
pdu = ModbusPDUGenericException(funcCode=function_code + 128, exceptCode=1)
return adu / pdu
def __validate_function_code(self, modbus_packet):
"""
Cheks if slave supports requested function code.
:param modbus_packet: Recived packet
:return: If it does, None is returned.
If it's not supported, the corresponding ModbusException Packet is returned.
"""
data = binascii.hexlify(bytes(modbus_packet.payload))
function_code = int(data[0:2], 16)
if function_code not in self.Configuration.SupportedFunctionCodes and function_code < 128:
adu = ModbusADU(len=3, transId=modbus_packet.transId)
pdu = ModbusPDUGenericException(funcCode=function_code + 128, exceptCode=1)
return adu / pdu
elif function_code > 127:
adu = ModbusADU(len=3, transId=modbus_packet.transId)
pdu = ModbusPDUGenericException(funcCode=128, exceptCode=1)
return adu / pdu