1#!/usr/local/bin/python3
2# send Address Resolution Protocol Announcement
3# expect Address Resolution Protocol response and check all fields
4# RFC 5227  IPv4 Address Conflict Detection
5# 2.3.  Announcing an Address
6
7import os
8from addr import *
9from scapy.all import *
10
11arp=ARP(op='who-has', hwsrc=LOCAL_MAC, psrc=REMOTE_ADDR,
12    hwdst="00:00:00:00:00:00", pdst=REMOTE_ADDR)
13eth=Ether(src=LOCAL_MAC, dst="ff:ff:ff:ff:ff:ff")/arp
14
15e=srp1(eth, iface=LOCAL_IF, timeout=2)
16
17if e and e.type == ETH_P_ARP:
18	a=e.payload
19	if a.hwtype != ARPHDR_ETHER:
20		print("HWTYPE=%#0.4x != ARPHDR_ETHER" % (a.hwtype))
21		exit(1)
22	if a.ptype != ETH_P_IP:
23		print("PTYPE=%#0.4x != ETH_P_IP" % (a.ptype))
24		exit(1)
25	if a.hwlen != 6:
26		print("HWLEN=%d != 6" % (a.hwlen))
27		exit(1)
28	if a.plen != 4:
29		print("PLEN=%d != 4" % (a.plen))
30		exit(1)
31	# XXX we should get a request from the defender, rfc5227 2.4 (3)
32	if a.op != 2:
33		print("OP=%s != is-at" % (a.op))
34		exit(1)
35	if a.hwsrc != REMOTE_MAC:
36		print("HWLOCAL=%s != REMOTE_MAC" % (a.hwsrc))
37		exit(1)
38	if a.psrc != REMOTE_ADDR:
39		print("PLOCAL=%s != REMOTE_ADDR" % (a.psrc))
40		exit(1)
41	if a.hwdst != LOCAL_MAC:
42		print("HWREMOTE=%s != LOCAL_MAC" % (a.hwdst))
43		exit(1)
44	if a.pdst != REMOTE_ADDR:
45		print("PREMOTE=%s != REMOTE_ADDR" % (a.pdst))
46		exit(1)
47	print("arp reply")
48	exit(0)
49
50print("NO ARP REPLY")
51exit(2)
52