1#!/usr/local/bin/python2.7
2# send 2 udp fragments with splitted payload
3
4# |--------|
5#          |----|
6
7import os
8from addr import *
9from scapy.all import *
10
11pid=os.getpid()
12payload="ABCDEFGHIJKLMNOP"
13packet=IPv6(src=SRC_OUT6, dst=DST_IN6)/UDP(sport=pid, dport=7)/payload
14frag=[]
15frag.append(IPv6ExtHdrFragment(nh=17, id=pid, m=1)/str(packet)[40:56])
16frag.append(IPv6ExtHdrFragment(nh=17, id=pid, offset=2)/str(packet)[56:64])
17eth=[]
18for f in frag:
19	pkt=IPv6(src=SRC_OUT6, dst=DST_IN6)/f
20	eth.append(Ether(src=SRC_MAC, dst=DST_MAC)/pkt)
21
22if os.fork() == 0:
23	time.sleep(1)
24	sendp(eth, iface=SRC_IF)
25	os._exit(0)
26
27ans=sniff(iface=SRC_IF, timeout=3, filter=
28    "ip6 and src "+DST_IN6+" and dst "+SRC_OUT6+" and udp")
29for a in ans:
30	if a and a.type == ETH_P_IPV6 and \
31	    ipv6nh[a.payload.nh] == 'UDP' and \
32	    a.payload.payload.sport == 7:
33		port=a.payload.payload.dport
34		print "port=%d" % (port)
35		if port != pid:
36			print "WRONG UDP ECHO REPLY PORT"
37			exit(2)
38		data=a.payload.payload.load
39		print "payload=%s" % (data)
40		if data == payload:
41			exit(0)
42		print "PAYLOAD!=%s" % (payload)
43		exit(1)
44print "NO UDP ECHO REPLY"
45exit(2)
46