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#!/usr/local/bin/python3
# end of new fragment overlaps old one
# |XXXXX----|
# |--------|
# RFC 5722 drop overlapping fragments
import os
import threading
from addr import *
from scapy.all import *
class Sniff1(threading.Thread):
filter = None
captured = None
packet = None
def run(self):
self.captured = sniff(iface=SRC_IF, filter=self.filter,
count=1, timeout=3)
if self.captured:
self.packet = self.captured[0]
dstaddr=sys.argv[1]
pid=os.getpid()
eid=pid & 0xffff
payload=b"ABCDEFGHIJKLOMNO"
dummy=b"01234567"
packet=IPv6(src=SRC_OUT6, dst=dstaddr)/ICMPv6EchoRequest(id=eid, data=payload)
fid=pid & 0xffffffff
frag0=IPv6ExtHdrFragment(nh=58, id=fid, m=1)/bytes(packet)[40:56]
frag1=IPv6ExtHdrFragment(nh=58, id=fid, offset=1)/(dummy+bytes(packet)[56:64])
pkt0=IPv6(src=SRC_OUT6, dst=dstaddr)/frag0
pkt1=IPv6(src=SRC_OUT6, dst=dstaddr)/frag1
eth=[]
eth.append(Ether(src=SRC_MAC, dst=PF_MAC)/pkt1)
eth.append(Ether(src=SRC_MAC, dst=PF_MAC)/pkt0)
sniffer = Sniff1();
sniffer.filter = "ip6 and src %s and dst %s and icmp6" % (dstaddr, SRC_OUT6)
sniffer.start()
time.sleep(1)
sendp(eth, iface=SRC_IF)
sniffer.join(timeout=5)
a = sniffer.packet
if a is None:
print("no reply")
exit(0)
if a and a.type == ETH_P_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 != eid:
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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