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troj.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Made by papi
# Created on: Mon 07 Sep 2020 06:50:04 PM CEST
# troj.py
# Description:

import socket, signal
import sys, os, time
import time 

from threading import *

KING_FILE='/root/king.txt'
USER_NAME='p4p1'
PID_FILE='/tmp/pid'

def empty_king_file():
    open(KING_FILE, 'w').close()

# Check if the king file is different than the name
# on success return the file descriptor, on error returns None
def check_file():
    fpr = open(KING_FILE, 'r', encoding='utf-8')
    val = fpr.read().strip()
    if val != USER_NAME:
        fpw = open(KING_FILE, 'w', encoding='utf-8')
        empty_king_file() # Empty the file before being able to add name
        return fpw
    fpr.close()
    return None


# function that changes the king file
def change_file():
    file = check_file()
    if file != None:
        file.write(USER_NAME + '\n') # Need a \n to be appended to act like
        file.close()                 # an echo

if __name__ == "__main__":
    if len(sys.argv) == 2:
        os.kill(int(sys.argv[1]), signal.SIGINT)
    change_file()
    time.sleep(0.5)
    os.system("python3 " + sys.argv[0] + " " + str(os.getpid()))