random: update initskript for machines with low entropy

[ipfire-2.x.git] / src / initscripts / system / random

#!/bin/sh
. /etc/sysconfig/rc
. $rc_functions

if [ -e /proc/sys/kernel/random/poolsize ]; then
	poolsize=$(</proc/sys/kernel/random/poolsize);
	poolsize=$(expr $poolsize / 8 );
else
	poolsize=512;
fi

case "$1" in
	start)

		#CRNG init need 128bit so wait until there is more)
		avail=$(</proc/sys/kernel/random/entropy_avail)
		while [ $avail -lt 130 ]; do
			avail=$(</proc/sys/kernel/random/entropy_avail)
			boot_mesg -n "\rWait for entropy: $avail/130   "
			# Generate some disc access to gather entropy
			echo  avail > /var/tmp/random-tmpfile
			sync
			rm -f /var/tmp/random-tmpfile
		done;

		boot_mesg "\rInitializing kernel random number generator..."
		if [ -f /var/tmp/random-seed ]; then
			/bin/cat /var/tmp/random-seed >/dev/urandom
		fi
		touch /var/tmp/random-seed
		chmod 600 /var/tmp/random-seed
		/bin/dd if=/dev/urandom of=/var/tmp/random-seed \
			count=1 bs=$poolsize &>/dev/null
		evaluate_retval
		;;

	stop)
		boot_mesg "Saving random seed..."
		touch /var/tmp/random-seed
		chmod 600 /var/tmp/random-seed
		/bin/dd if=/dev/urandom of=/var/tmp/random-seed \
			count=1 bs=$poolsize &>/dev/null
		evaluate_retval
		;;

	*)
		echo "Usage: $0 {start|stop}"
		exit 1
		;;
esac

# End $rc_base/init.d/random