1#!/usr/local/bin/python3 2 3print("ping6 fragments with two consecutive atomic fragment header") 4 5# |-IPv6-|-Frag-|-Frag-|-ICMP6-|-payload-| 6 7import os 8from addr import * 9from scapy.all import * 10 11pid=os.getpid() 12eid=pid & 0xffff 13payload=b"ABCDEFGHIJKLMNOP" 14packet=IPv6(src=LOCAL_ADDR6, dst=REMOTE_ADDR6)/ \ 15 ICMPv6EchoRequest(id=eid, data=payload) 16frag=[] 17fid=pid & 0xffffffff 18frag.append(IPv6ExtHdrFragment(id=fid)/ \ 19 IPv6ExtHdrFragment(nh=58, id=fid)/bytes(packet)[40:64]) 20eth=[] 21for f in frag: 22 pkt=IPv6(src=LOCAL_ADDR6, dst=REMOTE_ADDR6)/f 23 eth.append(Ether(src=LOCAL_MAC, dst=REMOTE_MAC)/pkt) 24 25if os.fork() == 0: 26 time.sleep(1) 27 sendp(eth, iface=LOCAL_IF) 28 os._exit(0) 29 30ans=sniff(iface=LOCAL_IF, timeout=3, filter= 31 "ip6 and src "+REMOTE_ADDR6+" and dst "+LOCAL_ADDR6+" and icmp6") 32for a in ans: 33 if a and a.type == ETH_P_IPV6 and \ 34 ipv6nh[a.payload.nh] == 'ICMPv6' and \ 35 icmp6types[a.payload.payload.type] == 'Echo Reply': 36 id=a.payload.payload.id 37 print("id=%#x" % (id)) 38 if id != eid: 39 print("WRONG ECHO REPLY ID") 40 exit(2) 41 data=a.payload.payload.data 42 print("payload=%s" % (data)) 43 if data == payload: 44 print("double atomic accepted") 45 exit(1) 46 print("PAYLOAD!=%s" % (payload)) 47 exit(2) 48print("no echo reply") 49exit(0) 50