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Network-scanner

Working

This network-scanner does basically is , it scans the network and shows how many devices are connected to that network and what is their id address and mac address.

Requirments

  • Linux OS
  • Scapy
  • argprase

Steps and Definition

  • First, we need to install scapy.Then we gonna need to import essential methods from scapy: from scapy.all import scapy

  • Second import argprase import argprase

  • Third, we gonna need to make an ARP request as shown in the following image:

The network scanner will send the ARP request indicating who has some specific IP address, let's say "192.168.1.1", the owner of that IP address ( the target ) will automatically respond saying that he is "192.168.1.1", with that response, the MAC address will also be included in the packet, this allows us to successfully retrieve all network users' IP and MAC addresses simultaneously when we send a broadcast packet ( sending a packet to all the devices in the network ).

The arp example is like shown in the follwowing image:

So lets create packets:

def scan_network(target_ip):                            
   arp_request = scapy.ARP(pdst=target_ip)      # Creating ARP packets.
   broadcast = scapy.Ether(dst="ff:ff:ff:ff:ff:ff")
   packet = broadcast/arp_request 
   ask_list = scapy.srp(packet, timeout = 3, verbose = False)[0]

Now we have created these packets, we need to send them using srp() function which sends and receives packets at layer 2, we set the timeout to 3 so the script won't get stuck: ask_list = scapy.srp(packet, timeout = 3, verbose = False)[0] Result now is a list of pairs that is of the format (sent_packet, received_packet), let's iterate over them:

packet_list = []
   for i in ask_list:
        packet_dict = {"ip" : i[1].psrc, "mac" : i[1].hwsrc}
        packet_list.append(packet_dict)
        return(packet_list)

Now lets Print:

def print_res(res):
    print(""" __  _ ___ _____ _   _  __  ___ _  __    __   ___ __  __  _ __  _ ___ ___   
|  \| | __|_   _| | | |/__\| _ \ |/ /  /' _/ / _//  \|  \| |  \| | __| _ \  
| | ' | _|  | | | 'V' | \/ | v /   <   `._`.| \_| /\ | | ' | | ' | _|| v /  
|_|\__|___| |_| !_/ \_!\__/|_|_\_|\_\  |___/ \__/_||_|_|\__|_|\__|___|_|_\  """)
    print("=========================================")
    print("IP\t\t\tMAC Address\n=========================================")
    for n in res:
        print(n["ip"] + "\t\t" + n["mac"])

To Run : python NetworkScanner.py -i IP address/24

Ouput:

image