#!/usr/local/bin/python3 print("send 3 non-overlapping ping6 fragments in all possible orders") # |----| # |----| # |----| import os from addr import * from scapy.all import * permute=[] permute.append([0,1,2]) permute.append([0,2,1]) permute.append([1,0,2]) permute.append([2,0,1]) permute.append([1,2,0]) permute.append([2,1,0]) pid=os.getpid() payload=b"ABCDEFGHIJKLMNOP" for p in permute: pid += 1 eid=pid & 0xffff packet=IPv6(src=LOCAL_ADDR6, dst=REMOTE_ADDR6)/ \ ICMPv6EchoRequest(id=eid, data=payload) frag=[] fid=pid & 0xffffffff frag.append(IPv6ExtHdrFragment(nh=58, id=fid, m=1)/bytes(packet)[40:48]) frag.append(IPv6ExtHdrFragment(nh=58, id=fid, offset=1, m=1)/bytes(packet)[48:56]) frag.append(IPv6ExtHdrFragment(nh=58, id=fid, offset=2)/bytes(packet)[56:64]) eth=[] for i in range(3): pkt=IPv6(src=LOCAL_ADDR6, dst=REMOTE_ADDR6)/frag[p[i]] eth.append(Ether(src=LOCAL_MAC, dst=REMOTE_MAC)/pkt) if os.fork() == 0: time.sleep(1) sendp(eth, iface=LOCAL_IF) os._exit(0) ans=sniff(iface=LOCAL_IF, timeout=3, filter= "ip6 and src "+REMOTE_ADDR6+" and dst "+LOCAL_ADDR6+" and icmp6") for a in ans: 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: break print("PAYLOAD!=%s" % (payload)) exit(1) else: print("NO ECHO REPLY") exit(2) print("permutation done") exit(0)