#!/sbin/runscript
# Copyright 1999-2012 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/sys-apps/rng-tools/files/rngd-initd-4,v 1.1 2012/11/11 06:24:22 vapier Exp $

depend() {
	need localmount
	after random
}

BINARY=/usr/sbin/rngd
# Do NOT add /dev/tpm to this.
DEFAULT_DEVICE="/dev/hw_random* /dev/hwrandom* /dev/i810_rng /dev/hwrng*"
DEFAULT_TPM_DEVICE="/dev/tpm*"
[ $DO_NOT_REMIX_URANDOM -eq 0 ] && DEFAULT_DEVICE="${DEFAULT_DEVICE} /dev/urandom"

find_device() {
	# The echo is to cause globbing
	local d
	for d in $* ; do
		[ -e "${d}" ] && break
	done
	echo "${d:-/dev/null}"
}

find_rng_device() {
	echo "$(find_device $(echo ${DEVICE:-${DEFAULT_DEVICE}}))"
}

find_tpm_device() {
	echo "$(find_device $(echo ${TPM_DEVICE:-${DEFAULT_TPM_DEVICE}}))"
}

start() {
	local d t
	d="$(find_rng_device)"
	[ "${NO_TPM}" = "1" ] || t="$(find_tpm_device)"

	if [ "${d}" = "/dev/null" -a "${t}" = "/dev/null" ] ; then
		eerror "No hardware RNG or feedback source available."
		return 1
	fi

	# TODO: find a better way to handle multiple feedback devices.
	# Notice that we only warn if TPM is not available.
	if [ "${d}" = "/dev/urandom" -a "${t}" = "/dev/null" ] ; then
		ewarn "No hardware RNG found, using ${d} as feedback input"
	fi

	ebegin "Starting hardware RNG daemon"
	start-stop-daemon --start --quiet --exec ${BINARY} -- \
		-b -s ${STEP:-64} --no-tpm=${NO_TPM:-0} -W ${WATERMARK:-2048} -r ${d}
	eend $?
}

stop() {
	ebegin "Stopping hardware RNG daemon"
	start-stop-daemon --stop --quiet --exec ${BINARY}
	eend $?
}