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dpa(1) General Commands Manual dpa(1) NAME
dpa - DNS Packet Analyzer. Analyze DNS packets in ip trace files SYNOPSIS
dpa [ OPTION ] TRACEFILE DESCRIPTION
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 occurences). OPTIONS
-c expressionlist Count occurrences of matching expressions -f expression 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) -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. -s Show possible match names -s matchname 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 packets. -u matchnamelist 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. -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). -version 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> <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. EXAMPLES
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. AUTHOR
Written by Jelte Jansen for NLnetLabs. REPORTING BUGS
Report bugs to <jelte@nlnetlabs.nl>. COPYRIGHT
Copyright (C) 2005 NLnet Labs. This is free software. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR- POSE. 1 Nov 2005 dpa(1)
