doorstatus/setstatus.py

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#!/usr/bin/python3
# -*- coding: utf-8 -*-
# file: setstatus.py
# date: 26.07.2019
# email: berhsi@web.de
# client, who connects to the statusserver at port 10001 to update the
# krautspace door status. If no status is given as argument, he reads from
# stdin until input is 0 or 1.
import socket
import ssl
from sys import exit, argv
def check_arguments(argv):
'''
Checks length and validity of command line argument vectors. If there is
no argument or argument is not valid, it returns None. Otherwise it
converts the string value into a byte value.
param 1: array of strings
return: None or byte value
'''
if len(argv) == 1:
byte_value = None
else:
if argv[1].strip() == '0' or argv[1].strip() == '1':
i = int(argv[1].strip())
print('Set value to {}'.format(i))
byte_value = bytes([i])
else:
byte_value = None
return byte_value
def read_argument():
'''
Reads from stdin until the given value is valid. Convert the given
string to a byte value and return this value.
return: byte value
'''
status = None
while status is None:
buf = input('Enter new status (0/1): ')
if buf == '0' or buf == '1':
status = bytes([int(buf)])
print('Read status: {}'.format(status))
return status
def main():
HOST = 'localhost'
PORT = 10001
SERVER_NAME = 'server.status.kraut.space'
CLIENT_CERT = './certs/client.crt'
CLIENT_KEY = './certs/client.key'
SERVER_CERT = './certs/server.crt'
STATUS = None
RESPONSE = None
STATUS = check_arguments(argv)
while STATUS is None:
STATUS = read_argument()
context = ssl.create_default_context(ssl.Purpose.SERVER_AUTH,
cafile=SERVER_CERT)
context.set_ciphers('EECDH+AESGCM') # only ciphers for tls 1.2 and 1.3
context.options |= getattr(ssl._ssl, 'OP_NO_COMPRESSION', 0)
context.load_cert_chain(certfile=CLIENT_CERT, keyfile=CLIENT_KEY)
print('SSL context created')
with socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0) as mySocket:
print('Socket created')
try:
conn = context.wrap_socket(mySocket, server_side=False,
server_hostname=SERVER_NAME)
print('Connection wrapped with ssl.context')
conn.settimeout(5.0)
except Exception as e:
print('Context wrapper failed: [}'.format(e))
try:
conn.connect((HOST, PORT))
print('Connection established: {}'.format(conn.getpeercert()))
except socket.timeout:
print('Connection timeout')
except Exception as e:
print('Connection failed: {}'.format(e))
exit(1)
try:
print('Send new status: {}'.format(STATUS))
conn.send(STATUS)
except Exception as e:
print('Error: {}'.format(e))
exit(2)
try:
RESPONSE = conn.recv(1)
print('Server returns: {}'.format(RESPONSE))
if RESPONSE == STATUS:
print('Status sucessfull updated')
else:
print('Failed to update status')
print('Disconnect from server')
except Exception as e:
print('Error: {}'.format(e))
exit(3)
if __name__ == '__main__':
main()