contrib/check_digitemp.pl

   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
 113 use strict;
 114 use Getopt::Std;
 115
 116 # Define all our variable usage
 117 use 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 $temp_fmt = 3;
 133
 134
 135 # Get the options
 136 if ($#ARGV le 0)
 137 {
 138   &usage;
 139 } else {
 140   getopts('f:t:FCc:w:');
 141 }
 142
 143 # Shortcircuit the switches
 144 if (!$opt_w or $opt_w == 0 or !$opt_c or $opt_c == 0)
 145 {
 146   print "*** You must define WARN and CRITICAL levels!";
 147   &usage;
 148 }
 149
 150 # Check if levels are sane
 151 if ($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   = $opt_c;
 160
 161 # Default sensor to read is #0
 162 if(!$opt_t)
 163 {
 164   $sensor = 0;
 165 } else {
 166   $sensor = $opt_t;
 167 }
 168
 169 # Default config file is /etc/digitemp.conf
 170 if(!$opt_f)
 171 {
 172   $conf_file = "/etc/digitemp.conf";
 173 } else {
 174   $conf_file = $opt_f;
 175 }
 176
 177 # Check for config file
 178 if( !-f $conf_file ) {
 179   print "*** You must have a digitemp.conf file\n";
 180   &usage;
 181 }
 182
 183
 184 if($opt_C)
 185 {
 186   $temp_fmt = 2;
 187 }
 188
 189 # Read the output from digitemp
 190 # Output in form 0\troom\tattic\tdrink
 191 open( DIGITEMP, "/usr/local/bin/digitemp -c $conf_file -t $sensor -q -o $temp_fmt |" );
 192
 193 # Process the output from the command
 194 while( <DIGITEMP> )
 195 {
 196 #  print "$_\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 }
 215 close( DIGITEMP );
 216
 217 if( $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
 236 sub 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 }