Systemsicherheit/Assignment 4 - Protokollsicherheit (Praxis)/proxy/proxymodules/mqtt.py

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2024-05-25 10:25:40 +02:00
#!/usr/bin/env python3
import os.path as path
import paho.mqtt.client as mqtt
from distutils.util import strtobool
class Module:
def __init__(self, incoming=False, verbose=False, options=None):
# extract the file name from __file__. __file__ is proxymodules/name.py
self.name = path.splitext(path.basename(__file__))[0]
self.description = 'Publish the data to an MQTT server'
self.incoming = incoming # incoming means module is on -im chain
self.client_id = ''
self.username = None
self.password = None
self.server = None
self.port = 1883
self.topic = ''
self.hex = False
if options is not None:
if 'clientid' in options.keys():
self.client_id = options['clientid']
if 'server' in options.keys():
self.server = options['server']
if 'username' in options.keys():
self.username = options['username']
if 'password' in options.keys():
self.password = options['password']
if 'port' in options.keys():
try:
self.port = int(options['port'])
if self.port not in range(1, 65536):
raise ValueError
except ValueError:
print(f'port: invalid port {options["port"]}, using default {self.port}')
if 'topic' in options.keys():
self.topic = options['topic'].strip()
if 'hex' in options.keys():
try:
self.hex = bool(strtobool(options['hex']))
except ValueError:
print(f'hex: {options["hex"]} is not a bool value, falling back to default value {self.hex}.')
if self.server is not None:
self.mqtt = mqtt.Client(self.client_id)
if self.username is not None or self.password is not None:
self.mqtt.username_pw_set(self.username, self.password)
self.mqtt.connect(self.server, self.port)
else:
self.mqtt = None
def execute(self, data):
if self.mqtt is not None:
if self.hex is True:
self.mqtt.publish(self.topic, data.hex())
else:
self.mqtt.publish(self.topic, data)
return data
def help(self):
h = '\tserver: server to connect to, required\n'
h += ('\tclientid: what to use as client_id, default is empty\n'
'\tusername: username\n'
'\tpassword: password\n'
'\tport: port to connect to, default 1883\n'
'\ttopic: topic to publish to, default is empty\n'
'\thex: encode data as hex before sending it. AAAA becomes 41414141.')
return h
if __name__ == '__main__':
print('This module is not supposed to be executed alone!')