Add munin plugin to monitor dhcp leases
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ohrensessel
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192
files/usr/share/munin/plugins/dhcp-pool
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192
files/usr/share/munin/plugins/dhcp-pool
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#!/usr/bin/perl -w
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#
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# Copyright (C) 2008 Rien Broekstra <rien@rename-it.nl>
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; version 2 dated June,
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# 1991.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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#
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#
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# Munin plugin to measure saturation of DHCP pools.
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#
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# Configuration variables:
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#
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# conffile - path to dhcpd's configuration file (default "/etc/dhcpd.conf")
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# leasefile - path to dhcpd's leases file (default "/var/lib/dhcp/dhcpd.leases")
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#
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# Parameters:
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#
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# config (required)
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#
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# Version 1.0, 2-12-2008
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use POSIX;
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use Time::Local;
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use strict;
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my $CONFFILE = exists $ENV{'conffile'} ? $ENV{'conffile'} : "/etc/dhcpd.conf";
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my $LEASEFILE = exists $ENV{'leasefile'} ? $ENV{'leasefile'} : "/var/lib/dhcp/dhcpd.leases";
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if ( defined $ARGV[0] and $ARGV[0] eq "autoconf" ) {
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}
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elsif ( defined $ARGV[0] and $ARGV[0] eq "config" ) {
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my (%pools, $start, $label);
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# Print general information
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print "graph_title DHCP pool usage (in %)\n";
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print "graph_args --upper-limit 100 -l 0\n";
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print "graph_vlabel %\n";
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print "graph_category network\n";
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# Determine the available IP pools
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%pools = determine_pools();
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# Print a label for each pool
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foreach $start (keys %pools) {
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$label = ip2string($start);
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$label =~ s/\./\_/g;
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print "$label.label Pool ".ip2string($start)."\n";
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print "$label.warning 75\n";
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print "$label.critical 100\n";
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}
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}
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else {
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my (@activeleases, %pools, $start, $end, $size, $free, $label, $lease);
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# Determine all leased IP addresses
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@activeleases = determine_active_leases();
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# Determine the available IP pools
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%pools = determine_pools();
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# For each pool, count how many leases from that pool are currently active
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foreach $start (keys %pools) {
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$size = $pools{$start};
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$end = $start+$size;
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$free = $size;
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foreach $lease (@activeleases) {
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if ($lease >= $start && $lease <= $end) {
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$free--;
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}
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}
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$label = ip2string($start);
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$label =~ s/\./\_/g;
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print "$label.value ".sprintf("%.1f", 100*($size-$free)/$size)."\n";
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}
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}
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# Parse dhcpd.conf for range statements.
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#
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# Returns a hash with start IP -> size
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sub determine_pools {
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my (%pools, @conffile, $line, $start, $end, $size);
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open(CONFFILE, "<${CONFFILE}") || exit -1;
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@conffile = <CONFFILE>;
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close (CONFFILE);
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foreach $line (@conffile) {
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if ($line =~ /range[\s]+([\d]+\.[\d]+\.[\d]+\.[\d]+)[\s]+([\d]+\.[\d]+\.[\d]+\.[\d]+)/) {
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$start = string2ip($1);
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$end = string2ip($2);
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$size = $end - $start;
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defined($start) || next;
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defined($end) || next;
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$pools{$start} = $size;
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}
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}
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return %pools;
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}
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# Very simple parser for dhcpd.leases. This will break very easily if dhcpd decides to
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# format the file differently. Ideally a simple recursive-descent parser should be used.
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#
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# Returns an array with currently leased IP's
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sub determine_active_leases {
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my (@leasefile, $startdate, $enddate, $lease, @activeleases, $mytz, $line, %saw);
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open(LEASEFILE, "<${LEASEFILE}") || exit -1;
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@leasefile = <LEASEFILE>;
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close (LEASEFILE);
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@activeleases = ();
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# Portable way of converting a GMT date/time string to timestamp is setting TZ to UTC, and then calling mktime()
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$mytz = $ENV{'TZ'};
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$ENV{'TZ'} = 'UTC 0';
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tzset();
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foreach $line (@leasefile) {
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if ($line =~ /lease ([\d]+\.[\d]+\.[\d]+\.[\d]+)/) {
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$lease = string2ip($1);
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defined($lease) || next;
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undef $startdate;
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undef $enddate;
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}
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elsif ($line =~ /starts \d ([\d]{4})\/([\d]{2})\/([\d]{2}) ([\d]{2}):([\d]{2}):([\d]{2})/) {
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$startdate = mktime($6, $5, $4, $3, $2-1, $1-1900, 0, 0);
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}
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elsif ($line =~ /ends \d ([\d]{4})\/([\d]{2})\/([\d]{2}) ([\d]{2}):([\d]{2}):([\d]{2})/) {
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$enddate = mktime($6, $5, $4, $3, $2-1, $1-1900, 0, 0);
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if (defined($enddate) && defined($startdate) && defined($lease)) {
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if ($startdate < time() && $enddate > time()) {
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push (@activeleases, $lease);
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}
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}
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}
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}
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# Set TZ back to its original setting
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if (defined($mytz)) {
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$ENV{'TZ'} = $mytz;
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}
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else {
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delete $ENV{'TZ'};
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}
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tzset();
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# Sort the array, strip doubles, and return
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return grep(!$saw{$_}++, @activeleases);
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}
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#
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# Helper routine to convert an IP address a.b.c.d into an integer
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#
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# Returns an integer representation of an IP address
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sub string2ip {
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my $string = shift;
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defined($string) || return undef;
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if ($string =~ /([\d]+)\.([\d]+)\.([\d]+)\.([\d]+)/) {
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if ($1 < 0 || $1 > 255 || $2 < 0 || $2 > 255 || $3 < 0 || $3 > 255 || $4 < 0 || $4 > 255) {
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return undef;
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}
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else {
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return $1 << 24 | $2 << 16 | $3 << 8 | $4;
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}
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}
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return undef;
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}
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#
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# Returns a dotted quad notation of an
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#
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sub ip2string {
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my $ip = shift;
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defined ($ip) || return undef;
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return sprintf ("%d.%d.%d.%d", ($ip >> 24) & 0xff, ($ip >> 16) & 0xff, ($ip >> 8) & 0xff, $ip & 0xff);
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}
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@ -162,6 +162,18 @@ host <%= @ipaddress_eth0 %>
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'/etc/munin/plugins/udp-statistics':
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ensure => link,
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target => '/usr/share/munin/plugins/udp-statistics';
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'/usr/share/munin/plugins/dhcp-pool':
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ensure => file,
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mode => '0755',
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source => 'puppet:///modules/ff_gw/usr/share/munin/plugins/dhcp-pool';
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'/etc/munin/plugins/dhcp-pool':
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ensure => link,
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target => '/usr/share/munin/plugins/dhcp-pool';
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'/etc/munin/plugin-conf.d/dhcp-pool':
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ensure => file,
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content => '[dhcp-pool]
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env.leasefile /var/lib/dhcp/dhcpd.leases
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env.conffile /etc/dhcp/dhcpd.conf';
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'/etc/munin/plugins/if_mullvad':
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ensure => link,
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target => '/usr/share/munin/plugins/if_';
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