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#!/sbin/runscript
# Copyright 1999-2007 Gentoo Foundation
# Copyright 2007 Roy Marples
# All rights reserved
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
urandom_seed=${urandom_seed:-${URANDOM_SEED:-/var/run/random-seed}}
description="Initializes the random number generator."
depend() {
need localmount
}
save_seed() {
local poolsize=1
if [ -e /proc/sys/kernel/random/poolsize ]; then
poolsize=$(($(cat /proc/sys/kernel/random/poolsize) / 4096))
fi
( # sub shell to prevent umask pollution
umask 077
dd if=/dev/urandom of="${urandom_seed}" count=${poolsize} 2>/dev/null
)
}
start() {
[ -c /dev/urandom ] || return
if [ -f "${urandom_seed}" ]; then
ebegin "Initializing random number generator"
cat "${urandom_seed}" > /dev/urandom
eend $? "Error initializing random number generator"
fi
rm -f "${urandom_seed}" && save_seed
return 0
}
stop() {
ebegin "Saving random seed"
# Carry a random seed from shut-down to start-up;
# see documentation in linux/drivers/char/random.c
save_seed
eend $? "Failed to save random seed"
}
# vim: set ts=4 :
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