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 occurrences).
- -c expressionlist
Count occurrences of matching expressions
- -f expression
Filter: only process packets that match the expression
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)
- -of file
Write all packets that match the -f flag to file, as pcap data.
- -ofh file
Write all packets that match the -f flag to file, in hexadecimal format, readable by drill.
Show possible match names
- -s matchname
show possible match operators and values for name
Only evaluate packets (in representation format) that match the -f filter. If no -f was given, evaluate all correct dns packets.
- -u matchnamelist
Count every occurrence of every value of the matchname (for instance, count all packetsizes, see Examples in ldns-dpa(1) ).
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.
For every matchname in -u, show the average number of times this value was encountered.
- -um number
Only show the results from -u for values that occurred more than <number> times.
- -v level
Set verbosity to level (1-5, 5 being the highest). Mostly used for debugging.
- -notip file
Write packets that were not recognized as IP packets to file (as pcap data).
- -baddns file
Write dns packets that were too mangled to parse to file (as pcap data).
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 precentages.
- 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 edns.tr
- 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 PURPOSE.