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Filename : entropy
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#!/bin/sh
#  -*- sh -*-

: << =cut

=head1 NAME

entropy - Plugin to monitor available entropy

=head1 CONFIGURATION

No configuration

=head1 AUTHOR

Unknown author

=head1 LICENSE

GPLv2

=head1 MAGIC MARKERS

 #%# family=auto
 #%# capabilities=autoconf

=cut

. $MUNIN_LIBDIR/plugins/plugin.sh

if [ "$1" = "autoconf" ]; then
	if [ -r /proc/sys/kernel/random/entropy_avail ]; then
		echo yes
		exit 0
	else
		echo no
		exit 0
	fi
fi
 
if [ "$1" = "config" ]; then
	echo 'graph_title Available entropy'
	echo 'graph_args --base 1000 -l 0'
	echo 'graph_vlabel entropy (bytes)'
	echo 'graph_scale no'
	echo 'graph_category system'
	echo 'graph_info This graph shows the amount of entropy available in the system.'
	echo 'entropy.label entropy'
	echo 'entropy.info The number of random bytes available. This is typically used by cryptographic applications.'
	print_warning entropy
	print_critical entropy
	exit 0
fi

echo -n "entropy.value "
cat /proc/sys/kernel/random/entropy_avail