#!/bin/sh
# 
# Plugin to monitor available entropy
#
# Usage: Link or copy into /etc/munin/node.d/
#
# Magic markers (optional - only used by munin-config and some
# installation scripts):
#
#%# family=auto
#%# capabilities=autoconf



if [ "$1" = "autoconf" ]; then
	if [ -x /sbin/rndctl ]; then
		echo yes
		exit 0
	else
		echo no
		exit 1
	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.'
	exit 0
fi

echo -n "entropy.value "
/sbin/rndctl -s | /usr/bin/awk '/bits currently stored/ { print $1 }'