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#!/usr/bin/env python
# Copyright (c) 2006, Neville-Neil Consulting
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# Neither the name of Neville-Neil Consulting nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# File: $Id: $
#
# Author: George V. Neville-Neil
#
# Description: A program using PCS to analyze a tcpdump file and give
# data relateing to whether or not the file shows a DDOS.
import pcs
from pcs.packets.ipv4 import *
from socket import inet_ntoa, inet_aton, ntohl
def main():
from optparse import OptionParser
parser = OptionParser()
parser.add_option("-f", "--file",
dest="file", default=None,
help="tcpdump file to read from")
parser.add_option("-m", "--max",
dest="max", default=10, type=int,
help="top N addresses to report")
parser.add_option("-s", "--subnet-mask",
dest="mask", default=None,
help="subnetmask")
parser.add_option("-n", "--network",
dest="network", default=None,
help="network we're looking at")
(options, args) = parser.parse_args()
file = pcs.PcapConnector(options.file)
max = options.max
mask = pcs.inet_atol(options.mask)
network = pcs.inet_atol(options.network)
done = False
srcmap = {}
packets = 0
in_network = 0
while not done:
try:
packet = file.read()
except:
done = True
packets += 1
ip = ipv4(packet[file.dloff:len(packet)])
if (ip.src & mask) != network:
if ip.src in srcmap:
srcmap[ip.src] += 1
else:
srcmap[ip.src] = 1
else:
in_network +=1
print "%d packets in dumpfile" % packets
print "%d unique source IPs" % len(srcmap)
print "%d packets in specified network" % in_network
print "Top %d source addresses were" % max
hit_list = sorted(srcmap.itervalues(), reverse = True)
for i in range(1,max):
for addr in srcmap.items():
if addr[1] == hit_list[i]:
print "Address %s\t Count %s\t Percentage %f" % (inet_ntop(AF_INET, struct.pack('!L', addr[0])), addr[1], (float(addr[1]) / float(packets)) * float(100))
main()
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