1#!/usr/local/bin/python3
2
3print("6 non-overlapping ping6 fragments in 75 seconds, timeout is 60")
4
5# |----|
6#      |----|
7#           |----|
8#                |----|
9#                     |----|      <--- timeout
10#                          |----|
11
12import os
13from addr import *
14from scapy.all import *
15
16pid=os.getpid()
17eid=pid & 0xffff
18payload=b"ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcd"
19packet=IPv6(src=LOCAL_ADDR6, dst=REMOTE_ADDR6)/ \
20    ICMPv6EchoRequest(id=eid, data=payload)
21frag=[]
22fid=pid & 0xffffffff
23frag.append(IPv6ExtHdrFragment(nh=58, id=fid,
24    m=1)/bytes(packet)[40:48])
25frag.append(IPv6ExtHdrFragment(nh=58, id=fid,
26    offset=1, m=1)/bytes(packet)[48:56])
27frag.append(IPv6ExtHdrFragment(nh=58, id=fid,
28    offset=2, m=1)/bytes(packet)[56:64])
29frag.append(IPv6ExtHdrFragment(nh=58, id=fid,
30    offset=3, m=1)/bytes(packet)[64:72])
31frag.append(IPv6ExtHdrFragment(nh=58, id=fid,
32    offset=4, m=1)/bytes(packet)[72:80])
33frag.append(IPv6ExtHdrFragment(nh=58, id=fid,
34    offset=5)/bytes(packet)[80:88])
35eth=[]
36for f in frag:
37	pkt=IPv6(src=LOCAL_ADDR6, dst=REMOTE_ADDR6)/f
38	eth.append(Ether(src=LOCAL_MAC, dst=REMOTE_MAC)/pkt)
39
40if os.fork() == 0:
41	time.sleep(1)
42	for e in eth:
43		sendp(e, iface=LOCAL_IF)
44		time.sleep(15)
45	os._exit(0)
46
47ans=sniff(iface=LOCAL_IF, timeout=90, filter=
48    "ip6 and src "+REMOTE_ADDR6+" and dst "+LOCAL_ADDR6+" and icmp6")
49for a in ans:
50	if a and a.type == ETH_P_IPV6 and \
51	    ipv6nh[a.payload.nh] == 'ICMPv6' and \
52	    icmp6types[a.payload.payload.type] == 'Echo Reply':
53		id=a.payload.payload.id
54		print("id=%#x" % (id))
55		if id != eid:
56			print("WRONG ECHO REPLY ID")
57			exit(2)
58		data=a.payload.payload.data
59		print("payload=%s" % (data))
60		if data == payload:
61			print("ECHO REPLY")
62			exit(1)
63		print("PAYLOAD!=%s" % (payload))
64		exit(2)
65print("no echo reply")
66exit(0)
67