Scan ports with Python

portscanner.py

import socket
import sys
import threading
import colorama
import tqdm

open_ports = []
ip = "192.168.1.1"  # Type here the IP you want to scan. I will use 192.168.1.1 as an example


def portscan(target: str, port: int) -> None:
    """
    Connect to a given IP using a port
    :param target: IP target
    :param port: the port we're going to use to connect
    :return: None
    """

    # Update variable outside function
    global open_ports

    try:
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  # Initialize socket instance
        s.settimeout(0.5)  # Timeout time before skipping
        con = s.connect_ex((target, port))  # Connect to target
        if con == 0:
            open_ports.append(str(port))  # Append port to the global open_ports variable
        s.close()

    except Exception:
        # If there's an error, ignore it. It means the connection couldn't be possible.
        pass


# Check if the IP is valid
assert ip, "IP cannot be blank"

try:
    ip = socket.gethostbyname(ip)

except socket.gaierror:
    print(f"Error in target '{ip}'. Target format must be: 'example.com' or '192.168.1.1'")
    sys.exit(-1)  # Abort execution

# Scan ports
for i in tqdm.tqdm(range(1, 65535), bar_format="{l_bar}{bar:10}{r_bar}{bar:-10}"):
    thread = threading.Thread(target=portscan, args=(ip, i))
    thread.start()

if not open_ports:
    print("No ports open!")

else:
    for port in open_ports:
        print(f"Port {colorama.Fore.LIGHTMAGENTA_EX}{port}{colorama.Fore.RESET}:\tOpen")  # Print ports