#!/usr/local/bin/python2.7 print "6 non-overlapping ping fragments in 75 seconds, timeout is 60" # |----| # |----| # |----| # |----| # |----| <--- timeout # |----| import os from addr import * from scapy.all import * pid=os.getpid() eid=pid & 0xffff payload="ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcd" packet=IP(src=LOCAL_ADDR, dst=REMOTE_ADDR)/ \ ICMP(type='echo-request', id=eid)/payload frag=[] fid=pid & 0xffff frag.append(IP(src=LOCAL_ADDR, dst=REMOTE_ADDR, proto=1, id=fid, flags='MF')/str(packet)[20:28]) frag.append(IP(src=LOCAL_ADDR, dst=REMOTE_ADDR, proto=1, id=fid, frag=1, flags='MF')/str(packet)[28:36]) frag.append(IP(src=LOCAL_ADDR, dst=REMOTE_ADDR, proto=1, id=fid, frag=2, flags='MF')/str(packet)[36:44]) frag.append(IP(src=LOCAL_ADDR, dst=REMOTE_ADDR, proto=1, id=fid, frag=3, flags='MF')/str(packet)[44:52]) frag.append(IP(src=LOCAL_ADDR, dst=REMOTE_ADDR, proto=1, id=fid, frag=4, flags='MF')/str(packet)[52:60]) frag.append(IP(src=LOCAL_ADDR, dst=REMOTE_ADDR, proto=1, id=fid, frag=5)/str(packet)[60:68]) eth=[] for f in frag: eth.append(Ether(src=LOCAL_MAC, dst=REMOTE_MAC)/f) if os.fork() == 0: time.sleep(1) for e in eth: sendp(e, iface=LOCAL_IF) time.sleep(15) os._exit(0) ans=sniff(iface=LOCAL_IF, timeout=90, filter= "ip and src "+REMOTE_ADDR+" and dst "+LOCAL_ADDR+" and icmp") for a in ans: if a and a.type == ETH_P_IP and \ a.payload.proto == 1 and \ a.payload.frag == 0 and a.payload.flags == 0 and \ icmptypes[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.payload.load print "payload=%s" % (data) if data == payload: print "ECHO REPLY" exit(1) print "PAYLOAD!=%s" % (payload) exit(1) print "no echo reply" exit(0)