SYNOPSISdnshistory [OPTION]... [--file=FILE]
COPYRIGHTdnshistory is Copyright © 2004, 2005, 2006, 2007 Stephen McInerney
DESCRIPTIONdnshistory currently processes Apache CLF and Combined logs, Squid access logs, FTP xferlog files and iptables based logs. The log format is auto-detected.
has five modes of operation:
The lookups make use of threads for maximum speed, and use the standard resolution libraries on a system. Thus hosts files, NIS, LDAP and other name resolution methods should work transparently.
It is strongly recommended that for massive lookups a DNS server is "nearby". Preferably not a forwarding server.
dnshistory can read .gz files. STDIN is assumed to not be gz encoded.
- -L --dolookups
- The default mode. Given a log file, either via STDIN or via '-f', do the lookups and store the results.
- -T --dotranslate
- Given a log file, either via STDIN or via '-f', lookup each IP Address from the history database; replace the IP Address with the FQDN and send the newly updated log line to STDOUT.
- -R --dorecombine=FILE
- Given a previously translated file (eg. via dnstran) via this option for the names, do the lookups for a file given via STDIN or '-f' and store the results. This file can be gz encoded.
- The date/time of each stored entry is taken as being the actual time for the lookup stored in the recombine log file. This is probably incorrect, but "Good Enough".
- -D --dodump
- Dump the history database to STDOUT.
- -I --doimport=FILE
- Given a previously dumped database, import that into a new database. Will fail and exit if the chosen database already exists.
- -S --showhistory
- Given one or more IP Addresses show their history. Address are the last item(s) on the command line. Addresses with no as yet discovered FQDN will display 'NONAME'. The Date/Time displayed is formatted as YYYY-MM-DD:hh:mm:ss, vs the 'seconds since epoch' for "--dodump"
- By default dnshistory will attempt to autodetect what type of logfile is being processed. By using this option, the autodetection is overridden. The choices are: auto, clf or www, squid, ftp or iptables.
- -c --cache=SIZE
- Set the size of the memory cache to use. Value is in Mb. Default is 20Mb.
- -d --database=FILE
- Change the default database file to use to store stateful data.
- -f --file=FILE
Web Log File to process. This file can be gz encoded.
Will use STDIN if not set
- -h --help
- Help screen. Very brief.
- -l --maxlookups=NUMBER
- The maximum number of lookups to attempt. The default is 1. This has not shown to be at all useful in testing...
- -m --maxthreads=NUMBER
How many name lookup threads to spawn off. The default is 100. Setting this too high can do evil things to bandwidth and the CPU usage of any queried DNS server(s).
If doing lots of DNS queries, setting this too high can have a very negative impact on the ability to successfully resolve anything.
- -t --timeout=VALUE
- The time in seconds before a stored DNS value is deemed "old". The default is 7 days.
- -v --verbose
- Verboseness of a run. More v's will increase the level of verbosity, up to a maximum of 5. All of the higher levels are only of value for debugging purposes.
- -V --version
- Display the version information and exit
- -w --wait
Delay time between query retries within a single run
RESULTSAt verbose level 1 (-v) some success/failure counters will be displayed. As well as any problematic log lines to STDERR.
At verbose level 2 (-vv) lines that may not match up (eg. Due to dnstran modifying referrers or URL's) will be sent to STDERR.
EXAMPLESA typical run, using a database in /tmp/ (/tmp/c.db), and a log file in the current directory (test.log). First, do the lookups:
dnshistory -d /tmp/c.db -f test.log
Then the translation run for input into, for example, a web log analyser:
dnshistory -T -d /tmp/c.db -f test.log | webalizer ....
Do three attempts on failed queries, with a 2 second delay between retries:
dnshistory -l 3 -w 2 -d /tmp/c.db -f test.log
Lookup and Display the history of three IP Addresses: 127.0.0.1,192.168.1.254,10.10.10.10
dnshistory -S -d /tmp/c.db 127.0.0.1 192.168.1.254 10.10.10.10
Import a previously dumped database via dnsdb.dump
dnshistory -I dnsdb.dump -d /tmp/d.db
The default history database file.
AUTHORStephen McInerney <[email protected]>