network_scanner2.py

network_scanner.py

#!/usr/bin/env python
from optparse import OptionParser
from scapy.all import srp, ARP, Ether


def get_args():
    parser = OptionParser()
    parser.add_option('-t', '--target', dest='ip', help='IP address range')
    options = parser.parse_args()[0]
    if not options.ip:
        parser.error('IP address range missing.')
    return options


#
# When a device sends a packet to the broadcast MAC address (ff:ff:ff:ff:ff:ff)
# it is delivered to all stations on the local network. It needs to be used in
# order for all devices to receive your packet at the data link layer.
#


def scan(ip):
    arp_request = ARP(pdst=ip)
    broadcast_request = Ether(dst='ff:ff:ff:ff:ff:ff')
    # arp_request.show()
    # broadcast_request.show()
    combined_packet = broadcast_request/arp_request
    answered, unanswered = srp(combined_packet, timeout=1, verbose=False)
    client_devices = []
    for answer in answered:
        client_network_dict = {'ip': answer[1].psrc, 'mac': answer[1].hwsrc}
        client_devices.append(client_network_dict)
    return client_devices


def print_client_devices(client_devices):
    print('IP\t\t\t\t\tMAC Address\n-----------------------------------------------')
    for device in client_devices:
        print(device['ip']+'\t\t'+device['mac'])


options = get_args()
client_devices = scan(options.ip)
print_client_devices(client_devices)