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arpDetector.py

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+from scapy.all import sniff
+IP_MAC_Map = {}
+
+def processPacket(packet):
+	src_IP = packet['ARP'].psrc
+	src_MAC = packet['Ether'].src
+	if src_MAC in IP_MAC_Map.keys():
+		if IP_MAC_Map[src_MAC] != src_IP :
+			try:
+				old_IP = IP_MAC_Map[src_MAC]
+			except:
+				old_IP = "unknown"
+			message = ("\n Possible ARP attack detected \n "
+			+ " It is possible that the machine with IP address 	 \n " + str(src_IP) + " is pretending to be " 
+			+ str(old_IP) + "\n ")
+			return message
+	else:
+		IP_MAC_Map[src_MAC] = src_IP
+	
+sniff(count=0, filter="arp", store = 0, prn = processPacket)