Code for How to Make a Port Scanner in Python Tutorial

simple_port_scanner.py

import socket # for connecting from colorama import init, Fore # some colors init() GREEN = Fore.GREEN RESET = Fore.RESET GRAY = Fore.LIGHTBLACK_EX def is_port_open(host, port): """ determine whether `host` has the `port` open """ # creates a new socket s = socket.socket() try: # tries to connect to host using that port s.connect((host, port)) # make timeout if you want it a little faster ( less accuracy ) s.settimeout(0.2) except: # cannot connect, port is closed # return false return False else: # the connection was established, port is open! return True # get the host from the user host = input("Enter the host:") # iterate over ports, from 1 to 1024 for port in range(1, 1025): if is_port_open(host, port): print(f"{GREEN}[+] {host}:{port} is open {RESET}") else: print(f"{GRAY}[!] {host}:{port} is closed {RESET}", end="\r")

fast_port_scanner.py

import argparse import socket # for connecting from colorama import init, Fore from threading import Thread, Lock from queue import Queue # some colors init() GREEN = Fore.GREEN RESET = Fore.RESET GRAY = Fore.LIGHTBLACK_EX # number of threads, feel free to tune this parameter as you wish N_THREADS = 200 # thread queue q = Queue() print_lock = Lock() def port_scan(port): """ Scan a port on the global variable `host` """ try: s = socket.socket() s.connect((host, port)) except: with print_lock: print(f"{GRAY}{host:15}:{port:5} is closed {RESET}", end='\r') else: with print_lock: print(f"{GREEN}{host:15}:{port:5} is open {RESET}") finally: s.close() def scan_thread(): global q while True: # get the port number from the queue worker = q.get() # scan that port number port_scan(worker) # tells the queue that the scanning for that port # is done q.task_done() def main(host, ports): global q for t in range(N_THREADS): # for each thread, start it t = Thread(target=scan_thread) # when we set daemon to true, that thread will end when the main thread ends t.daemon = True # start the daemon thread t.start() for worker in ports: # for each port, put that port into the queue # to start scanning q.put(worker) # wait the threads ( port scanners ) to finish q.join() if __name__ == "__main__": # parse some parameters passed parser = argparse.ArgumentParser(description="Simple port scanner") parser.add_argument("host", help="Host to scan.") parser.add_argument("--ports", "-p", dest="port_range", default="1-65535", help="Port range to scan, default is 1-65535 (all ports)") args = parser.parse_args() host, port_range = args.host, args.port_range start_port, end_port = port_range.split("-") start_port, end_port = int(start_port), int(end_port) ports = [ p for p in range(start_port, end_port)] main(host, ports)