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