lanscan.py

# Import scapy
import scapy.all as scapy
# We need to create regular expressions to ensure that the input is correctly formatted.
import re

# Basic user interface header
print(r"""          $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$    
          $$    _____      _____     __________     _________      _______     __________      $$             
          $$   |      \  /      |   /   ____   \   |   ____   \   /  ____  \  |   ______/      $$                          
          $$   |   |\  \/  /|   |  /   /    \   \  |  |    \   | |  |    |__| |  |             $$                   
          $$   |   | \    / |   | |   |      |   | |  |____/ _/  |  |_____    |  |______       $$                        
          $$   |   |  \__/  |   | |   |      |   | |    _   \     \______  \  |   ______|      $$                    
          $$   |   |        |   | |   |      |   | |   | \   \    __     |  | |  |             $$          
          $$   |   |        |   |  \   \____/   /  |   |  \   \  |  |____|  | |  |_______      $$                     
          $$   |___|        |___|   \__________/   |___|   \___\  \________/  |__________\     $$        
          $$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$ """)
          
print("\n* Copyright of Morse, 2021")
# Regular Expression Pattern to recognise IPv4 addresses.
ip_add_range_pattern = re.compile("^(?:[0-9]{1,3}\.){3}[0-9]{1,3}/[0-9]*$")

# Get the address range to ARP
while True:
    ip_add_range_entered = input("\nPlease enter the ip address and range that you want to send the ARP request to (ex 192.168.1.0/24): ")
    if ip_add_range_pattern.search(ip_add_range_entered):
        print(f"{ip_add_range_entered} is a valid ip address range")
        break


# Try ARPing the ip address range supplied by the user. 
# The arping() method in scapy creates a pakcet with an ARP message 
# and sends it to the broadcast mac address ff:ff:ff:ff:ff:ff.
# If a valid ip address range was supplied the program will return 
# the list of all results.
arp_result = scapy.arping(ip_add_range_entered)