init

2018-05-03 20:27:22 +02:00
commit 3ca191dd2f
10 changed files with 767 additions and 0 deletions
--- a/93
+++ b/93
@@ -0,0 +1,93 @@
+#!/usr/bin/perl
+#
+# check_entropy - Monitor systems entropy
+# Copyright (C) 2016 Josef 'veloc1ty' Stautner (hello@veloc1ty.de)
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+use strict;
+use Getopt::Long;
+
+our $ARG_WARNING_VALUE = 400;
+our $ARG_CRITICAL_VALUE = 200;
+
+sub isInt {
+    my $possibleInt = shift;
+
+    return 1 if ( $possibleInt =~ /\d+/ );
+    return 0;
+}
+
+sub exitUnknown {
+    printf("UNKNOWN - %s\n", shift);
+    exit(3);
+}
+
+sub exitCritical {
+    printf("CRITICAL - %s\n", shift);
+    exit(2);
+}
+
+sub exitWarning {
+    printf("WARNING - %s\n", shift);
+    exit(1);
+}
+
+sub parseArguments {
+    GetOptions (
+        'warning=i' => \$ARG_WARNING_VALUE,
+        'critical=i' => \$ARG_CRITICAL_VALUE
+    );
+
+    exitUnknown('--warning isn\'t a number') if ( ! isInt($ARG_WARNING_VALUE));
+    exitUnknown('--critical isn\'t a number') if ( ! isInt($ARG_CRITICAL_VALUE));
+
+    if ( $ARG_WARNING_VALUE < $ARG_CRITICAL_VALUE ) {
+        exitUnknown('--warning has to be greater that --critical')
+    }
+}
+
+sub getEntropy {
+    my $possibleEntropy = `cat /proc/sys/kernel/random/entropy_avail`;
+    chomp($possibleEntropy);
+
+    if ( ! isInt($possibleEntropy) ) {
+        exitCritical('Was not able to fetch available entropy');
+    }
+
+    return $possibleEntropy;
+}
+
+sub main {
+    parseArguments();
+
+    my $availableEntropy = getEntropy();
+    my $availableEntropyString =
+        sprintf('Available: %d|available_entropy=%d;%d;%d',
+            $availableEntropy, $availableEntropy, $ARG_WARNING_VALUE,
+            $ARG_CRITICAL_VALUE);
+
+
+    if ( $availableEntropy < $ARG_CRITICAL_VALUE ) {
+        exitCritical(sprintf('Not enogh entropy! %s', $availableEntropyString));
+    }
+    elsif ( $availableEntropy < $ARG_WARNING_VALUE ) {
+        exitWarning(sprintf('Slightly few entropy! %s', $availableEntropyString));
+    }
+    else {
+        printf("OK - Entropy is just fine! %s\n", $availableEntropyString);
+    }
+}
+
+main();