#!/bin/sh
# random - save system entropy pool at shutdown and reload it at boot time
#          to increase the quality of random number generation

[ -c /dev/urandom ] || exit 0

. /etc/sysconfig/rc
. $rc_functions

PATH=/sbin:/usr/sbin:/bin:/usr/bin

RANDOMSEED=/var/lib/misc/random-seed
POOLSIZE=512
[ -r /proc/sys/kernel/random/poolsize ] && POOLSIZE="$(cat /proc/sys/kernel/random/poolsize)"

case "$1" in
   start)
      echo -n $"Initializing random number generator: "
      if [ -f $RANDOMSEED ]; then
         cat $RANDOMSEED > /dev/urandom
      else
         touch $RANDOMSEED
      fi
      chmod 600 $RANDOMSEED
      dd if=/dev/urandom of=$RANDOMSEED count=1 bs=$POOLSIZE >/dev/null 2>&1
      evaluate_retval
      echo
   ;;
   stop)
      echo -n $"Saving random seed: "
      touch $RANDOMSEED
      chmod 600 $RANDOMSEED
      dd if=/dev/urandom of=$RANDOMSEED count=1 bs=$POOLSIZE >/dev/null 2>&1
      evaluate_retval
      echo
   ;;
   status)
      echo -n $"Checking for random generator: "
      echo_success
      echo
   ;;
   restart|reload|force-reload)
      echo "Error: argument '$1' not supported" >&2
      exit 3
   ;;
   *) echo "Usage: $0 start|stop|status"
      exit 1
   ;;
esac