#!/bin/sh
#
# random	Script to snapshot random state and reload it at boot time.
#
# chkconfig:	12345 20 80
#
# description:	Saves and restores system entropy pool for higher quality \
#		random number generation.
#

# Source function library.
. /etc/rc.d/init.d/functions

# do nothing in vserver
if is_yes "$VSERVER"; then
	return
fi

random_seed=/var/run/random-seed

poolfile=/proc/sys/kernel/random/poolsize
[ -r $poolfile ] && bytes="$(cat $poolfile)" || bytes=512

start() {
	# Check if the service is already running?
	if [ -f /var/lock/subsys/random ]; then
		return
	fi

	show "Initializing random number generator"
	busy
	# Carry a random seed from start-up to start-up
	if [ -f $random_seed ]; then
		cat $random_seed >/dev/urandom
	else
		touch $random_seed
	fi
	chmod 600 $random_seed
	dd if=/dev/urandom of=$random_seed count=1 bs=$bytes 2>/dev/null
	touch /var/lock/subsys/random
	deltext
	ok
}

stop() {
	if [ ! -f /var/lock/subsys/random ]; then
		return
	fi

	# Carry a random seed from shut-down to start-up
	show "Saving random seed"
	busy
	touch $random_seed
	chmod 600 $random_seed
	dd if=/dev/urandom of=$random_seed count=1 bs=$bytes 2>/dev/null

	rm -f /var/lock/subsys/random >/dev/null 2>&1
	deltext
	ok
}

status() {
	entropy_avail="$(cat /proc/sys/kernel/random/entropy_avail)"
	if [ "$entropy_avail" -eq 0 -o ! -c /dev/random ] ; then
		nls "The random data source is missing"
		RETVAL=1
	else
		nls "%d bytes of entropy available" $entropy_avail
	fi
}

# See how we were called.
case "$1" in
  start)
	start
	;;
  stop)
	stop
	;;
  status)
	status
	;;
  *)
	msg_usage "$0 {start|stop|status}"
	exit 3
esac

exit 0