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#!/usr/bin/env python
#
# Copyright 2019-2022 OARC, Inc.
# Copyright 2017-2018 Akamai Technologies
# Copyright 2006-2016 Nominum, Inc.
# All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import dns.message
import dns.rrset
import dns.flags
import dns.name
import pcapy
import socket
import sys
import struct
from optparse import OptionParser
__author__ = "Nominum, Inc."
__version__ = "1.0.2.0"
__date__ = "2007-05-14"
IPHeader = '!BBHHHBBHLL'
IPHDRLEN = 20
UDPHDRLEN = 8
LINKTYPE_C_HDLC = 104
LINKTYPE_ETHERNET = 1
qtypecount = {}
def main(argv):
parser = OptionParser(usage="%prog [options]",
version = "%prog " + __version__ )
parser.add_option("-i", "--input", dest="fin",
help="name of tcpdump file to parse", metavar="FILE")
parser.add_option("-o", "--output", dest="fout",
help="file in which to save parsed DNS queries",
metavar="FILE")
parser.add_option("-r", "--recursion", dest="recurse", action="store_true",
default=False,
help="Keep queries whose RD flag is 0 (default: discard)")
parser.add_option("-R", "--responses", dest="responses",
action="store_true", default=False,
help="Parse query responses instead of queries")
(opts, args) = parser.parse_args()
if opts.fin:
pcap = pcapy.open_offline(opts.fin)
else:
pcap = pcapy.open_offline('-')
linktype = pcap.datalink()
if linktype == LINKTYPE_C_HDLC:
IPHDRSTART = 4
else:
IPHDRSTART = 14
if opts.fout:
outfile = open(opts.fout, "w")
else:
outfile = sys.stdout
while True:
try:
packet = pcap.next()
except Exception:
break
if packet[0] is None:
break
packet = packet[1]
# Toss the stuff before the IP header
packet = packet[IPHDRSTART:]
# Grab the rest of the packet so we can parse proto
iphdr = packet[0:IPHDRLEN]
if len(iphdr) < IPHDRLEN:
continue
(vhl, tos, tlen, ipid, fragoff, ttl, proto, cksum, srcip, dstip) = \
struct.unpack(IPHeader, iphdr)
# Toss the IP header, we're done with it. We need to account
# for any IP header options.
ihl = (vhl & 0xF) * 4
packet = packet[ihl:]
if proto == socket.IPPROTO_UDP: # UDP, 8-byte header
packet = packet[UDPHDRLEN:]
else:
continue
try:
msg = dns.message.from_wire(packet)
except Exception:
continue
if not opts.recurse and not dns.flags.RD:
continue
if opts.responses:
querytest = msg.flags & dns.flags.QR
else:
querytest = not (msg.flags & dns.flags.QR)
if querytest:
for query in msg.question: # handle multiple queries per packet
fqdn = query.name.to_text()
qtype = dns.rdatatype.to_text(query.rdtype)
outfile.write("%s %s\n" % (fqdn, qtype))
# add qtype to dict if not present, otherwise increment
qtypecount[query.rdtype] = qtypecount.get(query.rdtype, 0) + 1
if outfile is not sys.stdout:
outfile.close()
sum = 0
print("Statistics:")
qtypes = list(qtypecount.keys())
qtypes.sort()
for qtype in qtypes:
qtype_str = dns.rdatatype.to_text(qtype)
count = qtypecount[qtype]
print(" %10s:\t%d" % (qtype_str, count))
sum += count
print("-------------------------")
print(" TOTAL:\t%d" % sum)
if __name__ == '__main__':
main(sys.argv[1:])
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