catvision.py

#!/usr/bin/python3
import sys  #importing sys module for error handling and commandline arguments
import socket   #socket module for connecting ports
from datetime import datetime   #datetime module for showing the time when the program starts running
import threading    #threading for running the code effectively
from concurrent.futures import ThreadPoolExecutor

def scan_port(target, port):    #defined a function which checks if a port is open for the target
    try:
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)   # ipv4 and tcp port
        s.settimeout(1)   #how long to connect until the socket connection breaks
        result = s.connect_ex((target, port))   #connect_ex returns 0 if a port is open
        if result ==0:
            print(f"Port {port} is open")   #if port is open then shows this message
        s.close()   #if a port is open then close that connection after scanning
    except socket.error as e:   #error handling if there is a socket error occurrence
        print(f"socket error {e} on port {port}")   #if so show this message
    except Exception as e:  #anyother exceptions..
        print(f"Unexpected error occurred {e} on port {port}")  #-then show this message

def main():     # the main function, this is the function which is going to run the first
    arg = len(sys.argv)     #assign the length of the commandline arguments
    target = sys.argv[arg-1]    #and then take the last part of the argument and assign it as the target

    try:
        target_ip = socket.gethostbyname(target)    #use the method to get the ip in case of a domain name
    except socket.gaierror:     #error handling
        print(f"Unable to resolve host to the address{target}")    #if the entered domain is not valid then show this
        sys.exit(1)     #exit the program with the error code 1
    print("\033[91mC A T     V I S I O N 👀\033[0m")
    print("""\033[91m
    ⢠
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⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⢸⣿⣿⣿⣿⣿⣿⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠸⠿⠭⠯⠭⠽⠿\033[0m""")    
    print("-" * 50)     #banner design when the code starts to run
    print(f"Scanning target {target_ip}")   #this will show the message as scanning the target
    print(f"Time started: {datetime.now()}")    #this will show the date of scanning the target
    print("-" * 50)

    try:
        # Limit the number of concurrent threads to a safe value (e.g. 100)
        with ThreadPoolExecutor(max_workers=100) as executor:
            for port in range(1, 65536):
                executor.submit(scan_port, target_ip, port)

    except KeyboardInterrupt:   #error handling in case of a keyboard interruption, then exit the program
        print("/nExiting program")
        sys.exit(0)     #no error code
    except socket.error as e:   #socket error
        print(f"Socket error occurred : {e}")   #socket error handling

if __name__ == "__main__":      #only run the program from here
    main()      #finally calling the main function to start the process