nagios-nrpe: Add a check dhcp_pool
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@ -14,6 +14,7 @@ The **patch** part changes is incremented if multiple releases happen the same m
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* minifirewall: configure proxy/backup/sysctl values
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* etc-git: Commit /etc in lxc containers when they are git repositories
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* nagios-nrpe: Add a check dhcp_pool
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### Changed
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@ -0,0 +1,223 @@
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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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# 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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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/dhcp/dhcpd.conf";
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my $LEASEFILE = exists $ENV{'leasefile'} ? $ENV{'leasefile'} : "/var/lib/dhcp/dhcpd.leases";
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my $WARNING_LEVEL = 70;
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my $CRITICAL_LEVEL = 90;
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my (@activeleases, %dhcp_pools, $pool_start, $pool_end, $pool_size, $pool_free, $pool_usage, $pool_status, $label, $lease, $nagios_return_code, $nagios_ok, $nagios_warning, $nagios_critical, @nagios_text, @nagios_perfdata);
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# Determine all leased IP addresses
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@activeleases = determine_active_leases();
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# Determine the available IP pools
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%dhcp_pools = determine_pools();
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# Nagios return code
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$nagios_return_code = 0;
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$nagios_ok = 0;
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$nagios_warning = 0;
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$nagios_critical = 0;
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# For each pool, count how many leases from that pool are currently active
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foreach $pool_start (keys %dhcp_pools) {
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$pool_size = $dhcp_pools{$pool_start};
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$pool_end = $pool_start+$pool_size-1;
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$pool_free = $pool_size;
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foreach $lease (@activeleases) {
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if ($lease >= $pool_start && $lease <= $pool_end) {
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$pool_free--;
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}
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}
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$label = ip2string($pool_start)."-".ip2string($pool_end);
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$pool_usage = sprintf("%.1f", 100*($pool_size-$pool_free)/$pool_size);
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if ($pool_usage >= $CRITICAL_LEVEL) {
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$nagios_return_code = 2;
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$nagios_critical++;
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$pool_status = "CRITICAL";
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} elsif ($pool_usage >= $WARNING_LEVEL) {
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if ($nagios_return_code == 0 ) {
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$nagios_return_code = 1;
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}
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$nagios_warning++;
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$pool_status = "WARNING";
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}
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else {
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$nagios_ok++;
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$pool_status = "OK";
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}
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push(@nagios_text, "$pool_status : $label - $pool_usage \n");
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push(@nagios_perfdata, "$label=$pool_usage%;$WARNING_LEVEL%;$CRITICAL_LEVEL%;;" );
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# 'label'=value[UOM];[warn];[crit];;
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}
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print nagios_code_2_txt($nagios_return_code)." - ".$nagios_critical." CRIT / ".$nagios_warning." WARN / ".$nagios_ok." OK \n\n";
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print grep(/CRITICAL/, @nagios_text);
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print grep(/WARNING/, @nagios_text);
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print grep(/OK/, @nagios_text);
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print "|@nagios_perfdata";
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exit $nagios_return_code;
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################
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###### FUNCTIONS
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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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next if $line =~ /^\s*#/;
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if ($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($2);
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defined($start) || next;
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defined($end) || next;
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# The range statement gives the lowest and highest IP addresses in a range.
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$size = $end - $start + 1;
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$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, $1-1900, 0, 0);
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}
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elsif ($line =~ /binding state active/) {
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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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#
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# Return textual status of return code
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#
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sub nagios_code_2_txt{
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my $code = shift;
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defined ($code) || return undef;
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if($code == 0 ) { return "OK" }
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elsif( $code == 1 ) { return "WARNING" }
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elsif( $code == 2 ) { return "CRITICAL" }
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}
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@ -57,6 +57,7 @@ command[check_bkctld_jails]=sudo /usr/sbin/bkctld check-jails
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command[check_bkctld]=sudo /usr/sbin/bkctld check
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command[check_postgrey]=/usr/lib/nagios/plugins/check_tcp -p10023
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command[check_influxdb]=/usr/lib/nagios/plugins/check_http -I 127.0.0.1 -u /health -p 8086 -r '"status":"pass"'
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command[check_dhcpd]=/usr/lib/nagios/plugins/check_procs -c1:1 -C dhcpd -t 60
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# Local checks (not packaged)
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command[check_mem]={{ nagios_plugins_directory }}/check_mem -f -C -w 20 -c 10
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@ -82,7 +83,7 @@ command[check_php-fpm74]=sudo {{ nagios_plugins_directory }}/check_phpfpm_multi
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command[check_php-fpm80]=sudo {{ nagios_plugins_directory }}/check_phpfpm_multi /var/lib/lxc/php80/rootfs/etc/php/8.0/fpm/pool.d/
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command[check_php-fpm81]=sudo {{ nagios_plugins_directory }}/check_phpfpm_multi /var/lib/lxc/php81/rootfs/etc/php/8.1/fpm/pool.d/
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command[check_ipmi_sensors]=sudo /usr/lib/nagios/plugins/check_ipmi_sensor
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command[check_raid_status]=/usr/lib/nagios/plugins/check_raid
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command[check_raid_status]={{ nagios_plugins_directory }}/check_dhcp_pool
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# Check HTTP "many". Use this to check many websites (http, https, ports, sockets and SSL certificates).
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# Beware! All checks must not take more than 10s!
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