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| 1 | +# The socket module in Python is an interface to the Berkeley sockets API. |
| 2 | +import socket |
| 3 | +# We need to create regular expressions to ensure that the input is correctly formatted. |
| 4 | +import re |
| 5 | + |
| 6 | +# Regular Expression Pattern to recognise IPv4 addresses. |
| 7 | +ip_add_pattern = re.compile("^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$") |
| 8 | +# Regular Expression Pattern to extract the number of ports you want to scan. |
| 9 | +# You have to specify <lowest_port_number>-<highest_port_number> (ex 10-100) |
| 10 | +port_range_pattern = re.compile("([0-9]+)-([0-9]+)") |
| 11 | +# Initialising the port numbers, will be using the variables later on. |
| 12 | +port_min = 0 |
| 13 | +port_max = 65535 |
| 14 | + |
| 15 | +# This script uses the socket api to see if you can connect to a port on a specified ip address. |
| 16 | +# Once you've successfully connected a port is seen as open. |
| 17 | +# This script does not discriminate the difference between filtered and closed ports. |
| 18 | + |
| 19 | +# Basic user interface header |
| 20 | +print(r"""______ _ _ ______ _ _ |
| 21 | +| _ \ (_) | | | ___ \ | | | | |
| 22 | +| | | |__ ___ ___ __| | | |_/ / ___ _ __ ___ | |__ __ _| | |
| 23 | +| | | / _` \ \ / / |/ _` | | ___ \/ _ \| '_ ` _ \| '_ \ / _` | | |
| 24 | +| |/ / (_| |\ V /| | (_| | | |_/ / (_) | | | | | | |_) | (_| | | |
| 25 | +|___/ \__,_| \_/ |_|\__,_| \____/ \___/|_| |_| |_|_.__/ \__,_|_|""") |
| 26 | +print("\n****************************************************************") |
| 27 | +print("\n* Copyright of David Bombal, 2021 *") |
| 28 | +print("\n* https://www.davidbombal.com *") |
| 29 | +print("\n* https://www.youtube.com/davidbombal *") |
| 30 | +print("\n****************************************************************") |
| 31 | + |
| 32 | +open_ports = [] |
| 33 | +# Ask user to input the ip address they want to scan. |
| 34 | +while True: |
| 35 | + ip_add_entered = input("\nPlease enter the ip address that you want to scan: ") |
| 36 | + if ip_add_pattern.search(ip_add_entered): |
| 37 | + print(f"{ip_add_entered} is a valid ip address") |
| 38 | + break |
| 39 | + |
| 40 | +while True: |
| 41 | + # You can scan 0-65535 ports. This scanner is basic and doesn't use multithreading so scanning all |
| 42 | + # the ports is not advised. |
| 43 | + print("Please enter the range of ports you want to scan in format: <int>-<int> (ex would be 60-120)") |
| 44 | + port_range = input("Enter port range: ") |
| 45 | + port_range_valid = port_range_pattern.search(port_range.replace(" ","")) |
| 46 | + if port_range_valid: |
| 47 | + port_min = int(port_range_valid.group(1)) |
| 48 | + port_max = int(port_range_valid.group(2)) |
| 49 | + break |
| 50 | + |
| 51 | +# Basic socket port scanning |
| 52 | +for port in range(port_min, port_max + 1): |
| 53 | + # Connect to socket of target machine. We need the ip address and the port number we want to connect to. |
| 54 | + try: |
| 55 | + # Create a socket object |
| 56 | + # You can create a socket connection similar to opening a file in Python. |
| 57 | + # We can change the code to allow for domain names as well. |
| 58 | + # With socket.AF_INET you can enter either a domain name or an ip address |
| 59 | + # and it will then continue with the connection. |
| 60 | + with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s: |
| 61 | + # You want to set a timeout for the socket to try and connect to the server. |
| 62 | + # If you make the duration longer it will return better results. |
| 63 | + # We put it at 0.5s. So for every port it scans it will allow 0.5s |
| 64 | + # for a successful connection. |
| 65 | + s.settimeout(0.5) |
| 66 | + # We use the socket object we created to connect to the ip address we entered |
| 67 | + # and the port number. If it can't connect to this socket it will cause an |
| 68 | + # exception and the open_ports list will not append the value. |
| 69 | + s.connect((ip_add_entered, port)) |
| 70 | + # If the following line runs then then it was successful in connecting to the port. |
| 71 | + open_ports.append(port) |
| 72 | + |
| 73 | + except: |
| 74 | + # We don't need to do anything here. If we were interested in the closed ports we'd put something here. |
| 75 | + pass |
| 76 | + |
| 77 | +# We only care about the open ports. |
| 78 | +for port in open_ports: |
| 79 | + # We use an f string to easily format the string with variables so we don't have to do concatenation. |
| 80 | + print(f"Port {port} is open on {ip_add_entered}.") |
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