Static Lease Logging
Frank Sweetser
fs at WPI.EDU
Thu Nov 27 13:49:57 UTC 2008
ben.tanner at canterbury.ac.uk wrote:
> Apologies if this has already been covered, but a brief google hasn't
> turned up anything yet.
>
> We're currently running a 'tweaked' version of dhcpd 3.0.3 that logs static
> leases out to the dhcpd.leases file along with the dynamics. We currently
> monitor dhcpd.leases with gamin/FAM, and then we scrape the leases out of
> the file and squirt them into a SQL database, where they are de-duplicated
> and recorded against our asset/IPAM database, so we can see the last time a
> static address was issued etc.
>
> I'd really like to upgrade dhcpd since it's about 3 years out of date and
> there have been a number of fixes for a few bugs that we're seeing with
> areas like failover. Additionally I'd like to switch to using a standard
> RHEL rpm rather than the proprietary version we currently run, for
> maintainability's sake. Unfortunately the staff member that made the
> modifications to the code has long since left, and I'm no coder myself, so
> I'm curious if anyone else has found a more elegant way of recording static
> leases being issued?
We gather up that data by using the on commit statement to generate a log
message, and pull the data out of syslog rather than the lease file itself.
on commit { if (static) {
log (info, concat (
"DHCPNETMON ",
binary-to-ascii (10,32,"",encode-int (lease-time,32))," ",
substring (binary-to-ascii (16,8,":",hardware), 2,17)," ",
binary-to-ascii (10,8,".",leased-address)," ",
pick-first-value(host-decl-name, "(none)"),
" static"));
} else {
log (info, concat (
"DHCPNETMON ",
binary-to-ascii (10,32,"",encode-int (lease-time,32))," ",
substring (binary-to-ascii (16,8,":",hardware), 2,17)," ",
binary-to-ascii (10,8,".",leased-address), " ",
pick-first-value(ddns-fwd-name, "(none)"),
" dynamic"));
}
}
--
Frank Sweetser fs at wpi.edu | For every problem, there is a solution that
WPI Senior Network Engineer | is simple, elegant, and wrong. - HL Mencken
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