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#!/usr/bin/perl -w
# check_digitemp.pl Copyright (C) 2002 by Brian C. Lane <bcl@brianlane.com>
#
# This is a NetSaint plugin script to check the temperature on a local
# machine. Remote usage may be possible with SSH
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to
# deal in the Software without restriction, including without limitation the
# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
# sell copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
# IN THE SOFTWARE.
#
# ===========================================================================
# Howto Install in NetSaint (tested with v0.0.7)
#
# 1. Copy this script to /usr/local/netsaint/libexec/ or wherever you have
# placed your NetSaint plugins
#
# 2. Create a digitemp config file in /usr/local/netsaint/etc/
# eg. digitemp -i -s/dev/ttyS0 -c /usr/local/netsaint/etc/digitemp.conf
#
# 3. Make sure that the webserver user has permission to access the serial
# port being used.
#
# 4. Add a command to /usr/local/netsaint/etc/commands.cfg like this:
# command[check-temp]=$USER1$/check_digitemp.pl -w $ARG1$ -c $ARG2$ \
# -t $ARG3$ -f $ARG4$
# (fold into one line)
#
# 5. Tell NetSaint to monitor the temperature by adding a service line like
# this to your hosts.cfg file:
# service[kermit]=Temperature;0;24x7;3;5;1;home-admins;120;24x7;1;1;1;; \
# check-temp!65!75!1!/usr/local/netsaint/etc/digitemp.conf
# (fold into one line)
# 65 is the warning temperature
# 75 is the critical temperature
# 1 is the sensor # (as reported by digitemp -a) to monitor
# digitemp.conf is the path to the config file
#
# 6. If you use Centigrade instead of Fahrenheit, change the commands.cfg
# line to include the -C argument. You can then pass temperature limits in
# Centigrade in the service line.
#
# ===========================================================================
# Howto Install in Nagios (tested with v1.0b4)
#
# 1. Copy this script to /usr/local/nagios/libexec/ or wherever you have
# placed your Nagios plugins
#
# 2. Create a digitemp config file in /usr/local/nagios/etc/
# eg. digitemp -i -s/dev/ttyS0 -c /usr/local/nagios/etc/digitemp.conf
#
# 3. Make sure that the webserver user has permission to access the serial
# port being used.
#
# 4. Add a command to /usr/local/nagios/etc/checkcommands.cfg like this:
#
# #DigiTemp temperature check command
# define command{
# command_name check_temperature
# command_line $USER1$/check_digitemp.pl -w $ARG1$ -c $ARG2$ \
# -t $ARG3$ -f $ARG4$
# (fold above into one line)
# }
#
# 5. Tell NetSaint to monitor the temperature by adding a service line like
# this to your service.cfg file:
#
# #DigiTemp Temperature check Service definition
# define service{
# use generic-service
# host_name kermit
# service_description Temperature
# is_volatile 0
# check_period 24x7
# max_check_attempts 3
# normal_check_interval 5
# retry_check_interval 2
# contact_groups home-admins
# notification_interval 240
# notification_period 24x7
# notification_options w,u,c,r
# check_command check_temperature!65!75!1! \
# /usr/local/nagios/etc/digitemp.conf
# (fold into one line)
# }
#
# 65 is the warning temperature
# 75 is the critical temperature
# 1 is the sensor # (as reported by digitemp -a) to monitor
# digitemp.conf is the path to the config file
#
# 6. If you use Centigrade instead of Fahrenheit, change the checkcommands.cfg
# line to include the -C argument. You can then pass temperature limits in
# Centigrade in the service line.
#
# ===========================================================================
# Modules to use
use strict;
use Getopt::Std;
# Define all our variable usage
use vars qw($opt_c $opt_f $opt_t $opt_w $opt_F $opt_C
$temperature $conf_file $sensor $temp_fmt
$crit_level $warn_level $null
%exit_codes
$percent $fmt_pct
$verb_err $command_line);
# Predefined exit codes for NetSaint
%exit_codes = ( 'OK' , 0,
'WARNING' , 1,
'CRITICAL', 2,
'UNKNOWN' ,3,);
# Default to Fahrenheit input and result (use -C to change this)
$temp_fmt = 3;
# Get the options
if ($#ARGV le 0)
{
&usage;
} else {
getopts('f:t:FCc:w:');
}
# Shortcircuit the switches
if (!$opt_w or $opt_w == 0 or !$opt_c or $opt_c == 0)
{
print "*** You must define WARN and CRITICAL levels!";
&usage;
}
# Check if levels are sane
if ($opt_w >= $opt_c)
{
print "*** WARN level must not be greater than CRITICAL when checking temperature!";
&usage;
}
$warn_level = $opt_w;
$crit_level = $opt_c;
# Default sensor to read is #0
if(!$opt_t)
{
$sensor = 0;
} else {
$sensor = $opt_t;
}
# Default config file is /etc/digitemp.conf
if(!$opt_f)
{
$conf_file = "/etc/digitemp.conf";
} else {
$conf_file = $opt_f;
}
# Check for config file
if( !-f $conf_file ) {
print "*** You must have a digitemp.conf file\n";
&usage;
}
if($opt_C)
{
$temp_fmt = 2;
}
# Read the output from digitemp
# Output in form 0\troom\tattic\tdrink
open( DIGITEMP, "/usr/local/bin/digitemp -c $conf_file -t $sensor -q -o $temp_fmt |" );
# Process the output from the command
while( <DIGITEMP> )
{
# print "$_\n";
chomp;
if( $_ =~ /^nanosleep/i )
{
print "Error reading sensor #$sensor\n";
close(DIGITEMP);
exit $exit_codes{'UNKNOWN'};
} else {
# Check for an error from digitemp, and report it instead
if( $_ =~ /^Error.*/i ) {
print $_;
close(DIGITEMP);
exit $exit_codes{'UNKNOWN'};
} else {
($null,$temperature) = split(/\t/);
}
}
}
close( DIGITEMP );
if( $temperature and $temperature >= $crit_level )
{
print "Temperature CRITICAL - Sensor #$sensor = $temperature ";
if( $temp_fmt == 3 ) { print "F\n"; } else { print "C\n"; }
exit $exit_codes{'CRITICAL'};
} elsif ($temperature and $temperature >= $warn_level ) {
print "Temperature WARNING - Sensor #$sensor = $temperature ";
if( $temp_fmt == 3 ) { print "F\n"; } else { print "C\n"; }
exit $exit_codes{'WARNING'};
} elsif( $temperature ) {
print "Temperature OK - Sensor #$sensor = $temperature ";
if( $temp_fmt == 3 ) { print "F\n"; } else { print "C\n"; }
exit $exit_codes{'OK'};
} else {
print "Error parsing result for sensor #$sensor\n";
exit $exit_codes{'UNKNOWN'};
}
# Show usage
sub usage()
{
print "\ncheck_digitemp.pl v1.0 - NetSaint Plugin\n";
print "Copyright 2002 by Brian C. Lane <bcl\@brianlane.com>\n";
print "See source for License\n";
print "usage:\n";
print " check_digitemp.pl -t <sensor> -f <config file> -w <warnlevel> -c <critlevel>\n\n";
print "options:\n";
print " -f DigiTemp Config File\n";
print " -t DigiTemp Sensor #\n";
print " -F Temperature in Fahrenheit\n";
print " -C Temperature in Centigrade\n";
print " -w temperature temperature >= to warn\n";
print " -c temperature temperature >= when critical\n";
exit $exit_codes{'UNKNOWN'};
}
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