Port scanner in Python ...

 

A simple threaded port scanner in python ...

If you don't want to use nmap , zenmap or other port-scanners

then this project is for you...

A disclaimer ... it may not work correctly all the time .. 

import socket     # pre-installed
import time
import threading
from queue import Queue

socket.setdefaulttimeout(0.25)    #  setting default time in every port ..
print_lock = threading.Lock()

target = input('Enter the host to be scanned: ')   # asking the user for target
t_IP = socket.gethostbyname(target)
print('Starting scan on host: ', t_IP)


def portscan(port):           # function for port scanner
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    try:
        con = s.connect((t_IP, port))
        with print_lock:
            print(port, 'is open')
        con.close()
    except:
        pass


def threader():     # function for threading
    while True:
        worker = q.get()
        portscan(worker)
        q.task_done()


q = Queue()
startTime = time.time()   # starting to record the time the port scanner started ..

for x in range(100):      # a for loop
    t = threading.Thread(target=threader)
    t.daemon = True
    t.start()

for worker in range(1, 500):   # an another for loop
    q.put(worker)

q.join()
print('Time taken:', time.time() - startTime)    # the total time taken

And the output looks something like this ...

Enter the host to be scanned: google.com
Starting scan on host:  216.58.200.142
80 is open
443 is open
Time taken: 1.3211915493011475
# as we know GOOGLE is a SEARCH ENGINE and PORTS 80 and 443 are the most common ports open in
a website...

An another example ...

Enter the host to be scanned: amazon.com
Starting scan on host:  205.251.242.103
80 is open
Time taken: 1.3240206241607666