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#!/usr/local/bin/python2.7
# old fragment completely overlaps new one
# |------------|
# |XXXX|
# |----|
# RFC 5722 drop overlapping fragments
import os
from addr import *
from scapy.all import *
dstaddr=sys.argv[1]
pid=os.getpid()
payload="ABCDEFGHIJKLOMNOQRSTUVWX"
dummy="01234567"
packet=IPv6(src=SRC_OUT6, dst=dstaddr)/ICMPv6EchoRequest(id=pid, data=payload)
frag0=IPv6ExtHdrFragment(nh=58, id=pid, offset=0, m=1)/str(packet)[40:48]
frag1=IPv6ExtHdrFragment(nh=58, id=pid, offset=2, m=1)/dummy
frag2=IPv6ExtHdrFragment(nh=58, id=pid, offset=1)/str(packet)[48:72]
pkt0=IPv6(src=SRC_OUT6, dst=dstaddr)/frag0
pkt1=IPv6(src=SRC_OUT6, dst=dstaddr)/frag1
pkt2=IPv6(src=SRC_OUT6, dst=dstaddr)/frag2
eth=[]
eth.append(Ether(src=SRC_MAC, dst=PF_MAC)/pkt2)
eth.append(Ether(src=SRC_MAC, dst=PF_MAC)/pkt1)
eth.append(Ether(src=SRC_MAC, dst=PF_MAC)/pkt0)
if os.fork() == 0:
time.sleep(1)
sendp(eth, iface=SRC_IF)
os._exit(0)
ans=sniff(iface=SRC_IF, timeout=3, filter=
"ip6 and src "+dstaddr+" and dst "+SRC_OUT6+" and icmp6")
if len(ans) == 0:
print "no reply"
exit(0)
a=ans[0]
if a and a.type == scapy.layers.dot11.ETHER_TYPES.IPv6 and \
ipv6nh[a.payload.nh] == 'ICMPv6' and \
icmp6types[a.payload.payload.type] == 'Echo Reply':
id=a.payload.payload.id
print "id=%#x" % (id)
if id != pid:
print "WRONG ECHO REPLY ID"
exit(2)
data=a.payload.payload.data
print "payload=%s" % (data)
if data == payload:
print "ECHO REPLY"
exit(1)
print "PAYLOAD!=%s" % (payload)
exit(2)
print "NO ECHO REPLY"
exit(2)
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