1#!/usr/local/bin/python2.7
2
3print "6 non-overlapping ping 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="ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcd"
19packet=IP(src=LOCAL_ADDR, dst=REMOTE_ADDR)/ \
20    ICMP(type='echo-request', id=eid)/payload
21frag=[]
22fid=pid & 0xffff
23frag.append(IP(src=LOCAL_ADDR, dst=REMOTE_ADDR, proto=1, id=fid,
24    flags='MF')/str(packet)[20:28])
25frag.append(IP(src=LOCAL_ADDR, dst=REMOTE_ADDR, proto=1, id=fid,
26    frag=1, flags='MF')/str(packet)[28:36])
27frag.append(IP(src=LOCAL_ADDR, dst=REMOTE_ADDR, proto=1, id=fid,
28    frag=2, flags='MF')/str(packet)[36:44])
29frag.append(IP(src=LOCAL_ADDR, dst=REMOTE_ADDR, proto=1, id=fid,
30    frag=3, flags='MF')/str(packet)[44:52])
31frag.append(IP(src=LOCAL_ADDR, dst=REMOTE_ADDR, proto=1, id=fid,
32    frag=4, flags='MF')/str(packet)[52:60])
33frag.append(IP(src=LOCAL_ADDR, dst=REMOTE_ADDR, proto=1, id=fid,
34    frag=5)/str(packet)[60:68])
35eth=[]
36for f in frag:
37	eth.append(Ether(src=LOCAL_MAC, dst=REMOTE_MAC)/f)
38
39if os.fork() == 0:
40	time.sleep(1)
41	for e in eth:
42		sendp(e, iface=LOCAL_IF)
43		time.sleep(15)
44	os._exit(0)
45
46ans=sniff(iface=LOCAL_IF, timeout=90, filter=
47    "ip and src "+REMOTE_ADDR+" and dst "+LOCAL_ADDR+" and icmp")
48for a in ans:
49	if a and a.type == ETH_P_IP and \
50	    a.payload.proto == 1 and \
51	    a.payload.frag == 0 and a.payload.flags == 0 and \
52	    icmptypes[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.payload.load
59		print "payload=%s" % (data)
60		if data == payload:
61			print "ECHO REPLY"
62			exit(1)
63		print "PAYLOAD!=%s" % (payload)
64		exit(1)
65print "no echo reply"
66exit(0)
67