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#!/bin/sh
#
# random Script to snapshot random state and reload it at boot time.
#
# Author: Theodore Ts'o <tytso@mit.edu>
#
# chkconfig: 2345 20 80
# description: Saves and restores system entropy pool for higher quality \
# random number generation.
# Source function library.
. /etc/rc.d/init.d/functions
random_seed=/var/run/random-seed
# See how we were called.
case "$1" in
start)
# Carry a random seed from start-up to start-up
# Load and then save 512 bytes, which is the size of the entropy pool
if [ -f $random_seed ]; then
cmd="cat $random_seed >/dev/urandom"
else
cmd="touch $random_seed"
fi
action "Initializing random number generator" $cmd
chmod 600 $random_seed
dd if=/dev/urandom of=$random_seed count=1 bs=512 2>/dev/null
touch /var/lock/subsys/random
;;
stop)
# Carry a random seed from shut-down to start-up
# Save 512 bytes, which is the size of the entropy pool
touch $random_seed
chmod 600 $random_seed
action "Saving random seed" dd if=/dev/urandom of=$random_seed count=1 bs=512 2>/dev/null
rm -f /var/lock/subsys/random
;;
status)
# this is way overkill, but at least we have some status output...
if [ -c /dev/random ] ; then
echo "The random data source exists"
else
echo "The random data source is missing"
fi
;;
restart|reload)
# do not do anything; this is unreasonable
:
;;
*)
# do not advertise unreasonable commands that there is no reason
# to use with this device
echo "Usage: random {start|stop|status|restart|reload}"
exit 1
esac
exit 0
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