dash-listen-1.py

import logging
logging.getLogger("scapy.runtime").setLevel(logging.ERROR)#Surpress's small errors from Scapy
from scapy.all import *


def arp_display(pkt):
  if pkt.haslayer(ARP): #makes sure it is ARP
    if pkt[ARP].op == 1: #who-has (request)
      if pkt[ARP].psrc == '0.0.0.0': # ARP Probe
        print "ARP Probe from: " + pkt[ARP].hwsrc

print sniff(prn=arp_display, filter="arp", store=0, count=0)

I noticed a few errors in while running a version of this on my
Raspberry Pi. One of them is that Scapy likes to through low level
errors that cause the program to crash. Another is when Scapy receives
a packet that isn’t ARP and tries to use ARP features on it and
crashes, so I made it check for that. Lastly I changed the count to 0
so that it runs until you tell it to stop with a Ctrl+C command.