dpa - DNS Packet Analyzer. Analyze DNS packets in ip trace files
dpa [ OPTION ] TRACEFILE
dpa is used to analyze dns packets in trace files. It has 3 main
options: count, filter, and count uniques (i.e. count all different
Count occurrences of matching expressions
Filter: only process packets that match the expression
-h Show usage
-p Show the total number of correct DNS packets, and percentage of
-u and -c values (of the total of matching on the -f filter. if
no filter is given, percentages are on all correct dns packets)
Write all packets that match the -f flag to file, as pcap data.
Write all packets that match the -f flag to file, in hexadecimal
format, readable by drill.
-s Show possible match names
show possible match operators and values for name
-sf Only evaluate packets (in representation format) that match the
-f filter. If no -f was given, evaluate all correct dns
Count every occurence of every value of the matchname (for
instance, count all packetsizes, see EXAMPLES in ldns-dpa(1) ).
-ua For every matchname in -u, show the average value of all
matches. Behaviour for match types that do not have an integer
value is undefined.
-uac For every matchname in -u, show the average number of times this
value was encountered.
Only show the results from -u for values that occurred more than
Set verbosity to level (1-5, 5 being the highest). Mostly used
Write packets that were not recognized as IP packets to file (as
Write dns packets that were too mangled to parse to file (as
Show version and exit
LIST AND MATCHES
A <matchnamelist> is a comma separated list of match names (use -s to
see possible match names). A <expressionlist> is a comma separated
list of expressions.
An expression has the following form: <expr>: (<expr>)
<expr> | <expr>
<expr> & <expr>
<match>: <matchname> <operator> <value>
<operator>: = equal to <value> != not equal to <value>
> greater than <value> < lesser than <value>
>= greater than or equal to <value> <= lesser than or
equal to <value> ~= contains <value>
See the -s option for possible matchnames, operators and values.
ldns-dpa -u packetsize -p test.tr
Count all different packetsizes in test.tr and show the
ldns-dpa -f "edns=1&qr=0" -of edns.tr test.tr
Filter out all edns enable queries in test.tr and put them in
ldns-dpa -f edns=1 -c tc=1 -u rcode test.tr
For all edns packets, count the number of truncated packets and
all their rcodes in test.tr.
ldns-dpa -c tc=1,qr=0,qr=1,opcode=QUERY test.tr
For all packets, count the number of truncated packets, the
number of packets with qr=0, the number of packets with qr=1 and
the number of queries in test.tr.
ldns-dpa -u packetsize -ua test.tr
Show all packet sizes and the average packet size per packet.
ldns-dpa -u srcaddress -uac test.tr
Show all packet source addresses and the average number of
packets sent from this address.
sudo tcpdump -i eth0 -s 0 -U -w - port 53 | ldns-dpa -f qr=0 -sf
Print all query packets seen on the specified interface.
Written by Jelte Jansen for NLnetLabs.
Report bugs to <email@example.com>.
Copyright (C) 2005 NLnet Labs. This is free software. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
1 Nov 2005 dpa(1)