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1#!/usr/bin/perl -w
2
3# check_digitemp.pl Copyright (C) 2002 by Brian C. Lane <bcl@brianlane.com>
4#
5# This is a NetSaint plugin script to check the temperature on a local
6# machine. Remote usage may be possible with SSH
7#
8# Permission is hereby granted, free of charge, to any person obtaining a copy
9# of this software and associated documentation files (the "Software"), to
10# deal in the Software without restriction, including without limitation the
11# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
12# sell copies of the Software, and to permit persons to whom the Software is
13# furnished to do so, subject to the following conditions:
14#
15# The above copyright notice and this permission notice shall be included in
16# all copies or substantial portions of the Software.
17#
18# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
23# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
24# IN THE SOFTWARE.
25#
26# ===========================================================================
27# Howto Install in NetSaint (tested with v0.0.7)
28#
29# 1. Copy this script to /usr/local/netsaint/libexec/ or wherever you have
30# placed your NetSaint plugins
31#
32# 2. Create a digitemp config file in /usr/local/netsaint/etc/
33# eg. digitemp -i -s/dev/ttyS0 -c /usr/local/netsaint/etc/digitemp.conf
34#
35# 3. Make sure that the webserver user has permission to access the serial
36# port being used.
37#
38# 4. Add a command to /usr/local/netsaint/etc/commands.cfg like this:
39# command[check-temp]=$USER1$/check_digitemp.pl -w $ARG1$ -c $ARG2$ \
40# -t $ARG3$ -f $ARG4$
41# (fold into one line)
42#
43# 5. Tell NetSaint to monitor the temperature by adding a service line like
44# this to your hosts.cfg file:
45# service[kermit]=Temperature;0;24x7;3;5;1;home-admins;120;24x7;1;1;1;; \
46# check-temp!65!75!1!/usr/local/netsaint/etc/digitemp.conf
47# (fold into one line)
48# 65 is the warning temperature
49# 75 is the critical temperature
50# 1 is the sensor # (as reported by digitemp -a) to monitor
51# digitemp.conf is the path to the config file
52#
53# 6. If you use Centigrade instead of Fahrenheit, change the commands.cfg
54# line to include the -C argument. You can then pass temperature limits in
55# Centigrade in the service line.
56#
57# ===========================================================================
58# Howto Install in Nagios (tested with v1.0b4)
59#
60# 1. Copy this script to /usr/local/nagios/libexec/ or wherever you have
61# placed your Nagios plugins
62#
63# 2. Create a digitemp config file in /usr/local/nagios/etc/
64# eg. digitemp -i -s/dev/ttyS0 -c /usr/local/nagios/etc/digitemp.conf
65#
66# 3. Make sure that the webserver user has permission to access the serial
67# port being used.
68#
69# 4. Add a command to /usr/local/nagios/etc/checkcommands.cfg like this:
70#
71# #DigiTemp temperature check command
72# define command{
73# command_name check_temperature
74# command_line $USER1$/check_digitemp.pl -w $ARG1$ -c $ARG2$ \
75# -t $ARG3$ -f $ARG4$
76# (fold above into one line)
77# }
78#
79# 5. Tell NetSaint to monitor the temperature by adding a service line like
80# this to your service.cfg file:
81#
82# #DigiTemp Temperature check Service definition
83# define service{
84# use generic-service
85# host_name kermit
86# service_description Temperature
87# is_volatile 0
88# check_period 24x7
89# max_check_attempts 3
90# normal_check_interval 5
91# retry_check_interval 2
92# contact_groups home-admins
93# notification_interval 240
94# notification_period 24x7
95# notification_options w,u,c,r
96# check_command check_temperature!65!75!1! \
97# /usr/local/nagios/etc/digitemp.conf
98# (fold into one line)
99# }
100#
101# 65 is the warning temperature
102# 75 is the critical temperature
103# 1 is the sensor # (as reported by digitemp -a) to monitor
104# digitemp.conf is the path to the config file
105#
106# 6. If you use Centigrade instead of Fahrenheit, change the checkcommands.cfg
107# line to include the -C argument. You can then pass temperature limits in
108# Centigrade in the service line.
109#
110# ===========================================================================
111
112# Modules to use
113use strict;
114use Getopt::Std;
115
116# Define all our variable usage
117use vars qw($opt_c $opt_f $opt_t $opt_w $opt_F $opt_C
118 $temperature $conf_file $sensor $temp_fmt
119 $crit_level $warn_level $null
120 %exit_codes
121 $percent $fmt_pct
122 $verb_err $command_line);
123
124
125# Predefined exit codes for NetSaint
126%exit_codes = ('UNKNOWN' ,-1,
127 'OK' , 0,
128 'WARNING' , 1,
129 'CRITICAL', 2,);
130
131# Default to Fahrenheit input and result (use -C to change this)
132$temp_fmt = 3;
133
134
135# Get the options
136if ($#ARGV le 0)
137{
138 &usage;
139} else {
140 getopts('f:t:FCc:w:');
141}
142
143# Shortcircuit the switches
144if (!$opt_w or $opt_w == 0 or !$opt_c or $opt_c == 0)
145{
146 print "*** You must define WARN and CRITICAL levels!";
147 &usage;
148}
149
150# Check if levels are sane
151if ($opt_w >= $opt_c)
152{
153 print "*** WARN level must not be greater than CRITICAL when checking temperature!";
154 &usage;
155}
156
157
158$warn_level = $opt_w;
159$crit_level = $opt_c;
160
161# Default sensor to read is #0
162if(!$opt_t)
163{
164 $sensor = 0;
165} else {
166 $sensor = $opt_t;
167}
168
169# Default config file is /etc/digitemp.conf
170if(!$opt_f)
171{
172 $conf_file = "/etc/digitemp.conf";
173} else {
174 $conf_file = $opt_f;
175}
176
177# Check for config file
178if( !-f $conf_file ) {
179 print "*** You must have a digitemp.conf file\n";
180 &usage;
181}
182
183
184if($opt_C)
185{
186 $temp_fmt = 2;
187}
188
189# Read the output from digitemp
190# Output in form 0\troom\tattic\tdrink
191open( DIGITEMP, "/usr/local/bin/digitemp -c $conf_file -t $sensor -q -o $temp_fmt |" );
192
193# Process the output from the command
194while( <DIGITEMP> )
195{
196# print "$_\n";
197 chomp;
198
199 if( $_ =~ /^nanosleep/i )
200 {
201 print "Error reading sensor #$sensor\n";
202 close(DIGITEMP);
203 exit $exit_codes{'UNKNOWN'};
204 } else {
205 # Check for an error from digitemp, and report it instead
206 if( $_ =~ /^Error.*/i ) {
207 print $_;
208 close(DIGITEMP);
209 exit $exit_codes{'UNKNOWN'};
210 } else {
211 ($null,$temperature) = split(/\t/);
212 }
213 }
214}
215close( DIGITEMP );
216
217if( $temperature and $temperature >= $crit_level )
218{
219 print "Temperature CRITICAL - Sensor #$sensor = $temperature ";
220 if( $temp_fmt == 3 ) { print "F\n"; } else { print "C\n"; }
221 exit $exit_codes{'CRITICAL'};
222} elsif ($temperature and $temperature >= $warn_level ) {
223 print "Temperature WARNING - Sensor #$sensor = $temperature ";
224 if( $temp_fmt == 3 ) { print "F\n"; } else { print "C\n"; }
225 exit $exit_codes{'WARNING'};
226} elsif( $temperature ) {
227 print "Temperature OK - Sensor #$sensor = $temperature ";
228 if( $temp_fmt == 3 ) { print "F\n"; } else { print "C\n"; }
229 exit $exit_codes{'OK'};
230} else {
231 print "Error parsing result for sensor #$sensor\n";
232 exit $exit_codes{'UNKNOWN'};
233}
234
235# Show usage
236sub usage()
237{
238 print "\ncheck_digitemp.pl v1.0 - NetSaint Plugin\n";
239 print "Copyright 2002 by Brian C. Lane <bcl\@brianlane.com>\n";
240 print "See source for License\n";
241 print "usage:\n";
242 print " check_digitemp.pl -t <sensor> -f <config file> -w <warnlevel> -c <critlevel>\n\n";
243 print "options:\n";
244 print " -f DigiTemp Config File\n";
245 print " -t DigiTemp Sensor #\n";
246 print " -F Temperature in Fahrenheit\n";
247 print " -C Temperature in Centigrade\n";
248 print " -w temperature temperature >= to warn\n";
249 print " -c temperature temperature >= when critical\n";
250
251 exit $exit_codes{'UNKNOWN'};
252}