94 lines
2.5 KiB
Perl
Executable File
94 lines
2.5 KiB
Perl
Executable File
#!/usr/bin/perl
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#
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# check_entropy - Monitor systems entropy
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# Copyright (C) 2016 Josef 'veloc1ty' Stautner (hello@veloc1ty.de)
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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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, see <http://www.gnu.org/licenses/>.
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use strict;
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use Getopt::Long;
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our $ARG_WARNING_VALUE = 400;
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our $ARG_CRITICAL_VALUE = 200;
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sub isInt {
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my $possibleInt = shift;
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return 1 if ( $possibleInt =~ /\d+/ );
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return 0;
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}
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sub exitUnknown {
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printf("UNKNOWN - %s\n", shift);
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exit(3);
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}
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sub exitCritical {
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printf("CRITICAL - %s\n", shift);
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exit(2);
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}
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sub exitWarning {
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printf("WARNING - %s\n", shift);
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exit(1);
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}
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sub parseArguments {
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GetOptions (
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'warning=i' => \$ARG_WARNING_VALUE,
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'critical=i' => \$ARG_CRITICAL_VALUE
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);
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exitUnknown('--warning isn\'t a number') if ( ! isInt($ARG_WARNING_VALUE));
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exitUnknown('--critical isn\'t a number') if ( ! isInt($ARG_CRITICAL_VALUE));
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if ( $ARG_WARNING_VALUE < $ARG_CRITICAL_VALUE ) {
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exitUnknown('--warning has to be greater that --critical')
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}
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}
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sub getEntropy {
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my $possibleEntropy = `cat /proc/sys/kernel/random/entropy_avail`;
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chomp($possibleEntropy);
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if ( ! isInt($possibleEntropy) ) {
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exitCritical('Was not able to fetch available entropy');
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}
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return $possibleEntropy;
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}
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sub main {
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parseArguments();
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my $availableEntropy = getEntropy();
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my $availableEntropyString =
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sprintf('Available: %d|available_entropy=%d;%d;%d',
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$availableEntropy, $availableEntropy, $ARG_WARNING_VALUE,
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$ARG_CRITICAL_VALUE);
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if ( $availableEntropy < $ARG_CRITICAL_VALUE ) {
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exitCritical(sprintf('Not enogh entropy! %s', $availableEntropyString));
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}
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elsif ( $availableEntropy < $ARG_WARNING_VALUE ) {
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exitWarning(sprintf('Slightly few entropy! %s', $availableEntropyString));
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}
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else {
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printf("OK - Entropy is just fine! %s\n", $availableEntropyString);
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}
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}
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main();
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