749f65e3e3
Import print_function from the __future__ module to activate this for Python 2. This works as far back as Python 2.6.0a2: https://docs.python.org/2/library/__future__.html [PEP 3105] https://www.python.org/dev/peps/pep-3105/
78 lines
2.8 KiB
Python
78 lines
2.8 KiB
Python
# Copyright (C) 2008 Michael J. Silbersack. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice unmodified, this list of conditions, and the following
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# disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# $FreeBSD$
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#
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# This is a regression test to verify the proper behavior of IP ID generation
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# code. It will push 200000 packets, then report back what the min and max
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# periods it saw for different IDs were.
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from __future__ import print_function
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import os
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import signal
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import subprocess
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import time
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if os.path.exists('results.pcap'):
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os.remove('results.pcap')
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tcpdump = subprocess.Popen('tcpdump -n -i lo0 -w results.pcap icmp', shell=True)
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time.sleep(1) # Give tcpdump time to start
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os.system('sysctl net.inet.icmp.icmplim=0')
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os.system('ping -q -i .001 -c 100000 127.0.0.1')
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time.sleep(3) # Give tcpdump time to catch up
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os.kill(tcpdump.pid, signal.SIGTERM)
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os.system('tcpdump -n -v -r results.pcap > results.txt')
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id_lastseen = {}
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id_minperiod = {}
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count = 0
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for line in open('results.txt').readlines():
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id = int(line.split(' id ')[1].split(',')[0])
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if id in id_lastseen:
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period = count - id_lastseen[id]
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if id not in id_minperiod or period < id_minperiod[id]:
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id_minperiod[id] = period
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id_lastseen[id] = count
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count += 1
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sorted_minperiod = list(zip(*reversed(list(zip(*list(id_minperiod.items()))))))
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sorted_minperiod.sort()
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print("Lowest 10 ID periods detected:")
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x = 0
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while x < 10:
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id_tuple = sorted_minperiod.pop(0)
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print("id: %d period: %d" % (id_tuple[1], id_tuple[0]))
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x += 1
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print("Highest 10 ID periods detected:")
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x = 0
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while x < 10:
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id_tuple = sorted_minperiod.pop()
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print("id: %d period: %d" % (id_tuple[1], id_tuple[0]))
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x += 1
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