Prerequisites: Socket Programming in Python
This article is just to provide a sample code to generate a Port Scanner. This Port Scanner will work for both the Web Applications as well as remote Host. This tool has been created to provide the basic functionality of a Port Scanner. The general concept of Sockets had been used to provide the functionality. Port Scanner is built on Python 3 and uses some extra libraries such as socket and pyfiglet (for a fancy banner).
Please find the below source code for the Port Scanner :
Source Code
Python3
import pyfigletimport sysimport socketfrom datetime import datetime ascii_banner = pyfiglet.figlet_format("PORT SCANNER")print(ascii_banner) # Defining a targetif len(sys.argv) == 2: # translate hostname to IPv4 target = socket.gethostbyname(sys.argv[1])else: print("Invalid amount of Argument")# Add Bannerprint("-" * 50)print("Scanning Target: " + target)print("Scanning started at:" + str(datetime.now()))print("-" * 50) try: # will scan ports between 1 to 65,535 for port in range(1,65535): s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) socket.setdefaulttimeout(1) # returns an error indicator result = s.connect_ex((target,port)) if result ==0: print("Port {} is open".format(port)) s.close() except KeyboardInterrupt: print("\n Exiting Program !!!!") sys.exit()except socket.gaierror: print("\n Hostname Could Not Be Resolved !!!!") sys.exit()except socket.error: print("\ Server not responding !!!!") sys.exit() |
Output:
Note: In the above code at line 27 i.e for the port in range(1, 65535): you can custom define your ports under which range you have to scan. This port scanner will generally take the time of 2 mins maximum to produce output in the format, that so and so ports are open or closed.
