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port_scanner_ip_obj.py
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port_scanner_ip_obj.py
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#!/usr/bin/env python3
# The socket module in Python is an interface to the Berkeley sockets API.
import socket
# We import the ipaddress module. We want to use the ipaddress.ip_address(address)
# method to see if we can instantiate a valid ip address to test.
import ipaddress
# We need to create regular expressions to ensure that the input is correctly formatted.
import re
# Regular Expression Pattern to extract the number of ports you want to scan.
# You have to specify <lowest_port_number>-<highest_port_number> (ex 10-100)
port_range_pattern = re.compile("([0-9]+)-([0-9]+)")
# Initialising the port numbers, will be using the variables later on.
port_min = 0
port_max = 65535
# This script uses the socket api to see if you can connect to a port on a specified ip address.
# Once you've successfully connected a port is seen as open.
# This script does not discriminate the difference between filtered and closed ports.
# Basic user interface header
print(r"""______ _ _ ______ _ _
| _ \ (_) | | | ___ \ | | | |
| | | |__ ___ ___ __| | | |_/ / ___ _ __ ___ | |__ __ _| |
| | | / _` \ \ / / |/ _` | | ___ \/ _ \| '_ ` _ \| '_ \ / _` | |
| |/ / (_| |\ V /| | (_| | | |_/ / (_) | | | | | | |_) | (_| | |
|___/ \__,_| \_/ |_|\__,_| \____/ \___/|_| |_| |_|_.__/ \__,_|_|""")
print("\n****************************************************************")
print("\n* Copyright of David Bombal, 2021 *")
print("\n* https://www.davidbombal.com *")
print("\n* https://www.youtube.com/davidbombal *")
print("\n****************************************************************")
open_ports = []
# Ask user to input the ip address they want to scan.
while True:
ip_add_entered = input("\nPlease enter the ip address that you want to scan: ")
# If we enter an invalid ip address the try except block will go to the except block and say you entered an invalid ip address.
try:
ip_address_obj = ipaddress.ip_address(ip_add_entered)
# The following line will only execute if the ip is valid.
print("You entered a valid ip address.")
break
except:
print("You entered an invalid ip address")
while True:
# You can scan 0-65535 ports. This scanner is basic and doesn't use multithreading so scanning all
# the ports is not advised.
print("Please enter the range of ports you want to scan in format: <int>-<int> (ex would be 60-120)")
port_range = input("Enter port range: ")
# We pass the port numbers in by removing extra spaces that people sometimes enter.
# So if you enter 80 - 90 instead of 80-90 the program will still work.
port_range_valid = port_range_pattern.search(port_range.replace(" ",""))
if port_range_valid:
# We're extracting the low end of the port scanner range the user want to scan.
port_min = int(port_range_valid.group(1))
# We're extracting the upper end of the port scanner range the user want to scan.
port_max = int(port_range_valid.group(2))
break
# Basic socket port scanning
for port in range(port_min, port_max + 1):
# Connect to socket of target machine. We need the ip address and the port number we want to connect to.
try:
# Create a socket object
# You can create a socket connection similar to opening a file in Python.
# We can change the code to allow for domain names as well.
# With socket.AF_INET you can enter either a domain name or an ip address
# and it will then continue with the connection.
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
# You want to set a timeout for the socket to try and connect to the server.
# If you make the duration longer it will return better results.
# We put it at 0.5s. So for every port it scans it will allow 0.5s
# for a successful connection.
s.settimeout(0.5)
# We use the socket object we created to connect to the ip address we entered and the port number.
# If it can't connect to this socket it will cause an exception and the open_ports list will not
# append the value.
s.connect((ip_add_entered, port))
# If the following line runs then then it was successful in connecting to the port.
open_ports.append(port)
except:
# We don't need to do anything here. If we were interested in the closed ports we'd put something here.
pass
# We only care about the open ports.
for port in open_ports:
# We use an f string to easily format the string with variables so we don't have to do concatenation.
print(f"Port {port} is open on {ip_add_entered}.")