1#!/usr/local/bin/python3
2
3print("non-overlapping ping6 fragments with ethernet padding")
4
5# |--------|XX|
6#          |----|XX|
7
8import os
9from addr import *
10from scapy.all import *
11
12pid=os.getpid()
13eid=pid & 0xffff
14payload=b"ABCDEFGHIJKLMNOP"
15padding=b"0123"
16packet=IPv6(src=LOCAL_ADDR6, dst=REMOTE_ADDR6)/ \
17    ICMPv6EchoRequest(id=eid, data=payload)
18frag=[]
19fid=pid & 0xffffffff
20frag.append(IPv6ExtHdrFragment(nh=58, id=fid, m=1)/bytes(packet)[40:56])
21frag.append(IPv6ExtHdrFragment(nh=58, id=fid, offset=2)/bytes(packet)[56:64])
22eth=[]
23for f in frag:
24	pkt=bytes(IPv6(src=LOCAL_ADDR6, dst=REMOTE_ADDR6)/f) + padding
25	eth.append(Ether(src=LOCAL_MAC, dst=REMOTE_MAC, type=0x86dd)/pkt)
26
27if os.fork() == 0:
28	time.sleep(1)
29	sendp(eth, iface=LOCAL_IF)
30	os._exit(0)
31
32ans=sniff(iface=LOCAL_IF, timeout=3, filter=
33    "ip6 and src "+REMOTE_ADDR6+" and dst "+LOCAL_ADDR6+" and icmp6")
34for a in ans:
35	if a and a.type == ETH_P_IPV6 and \
36	    ipv6nh[a.payload.nh] == 'ICMPv6' and \
37	    icmp6types[a.payload.payload.type] == 'Echo Reply':
38		id=a.payload.payload.id
39		print("id=%#x" % (id))
40		if id != eid:
41			print("WRONG ECHO REPLY ID")
42			exit(2)
43		data=a.payload.payload.data
44		print("payload=%s" % (data))
45		if data == payload:
46			exit(0)
47		print("PAYLOAD!=%s" % (payload))
48		exit(1)
49print("NO ECHO REPLY")
50exit(2)
51