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# -* shell-script -*-
readoptions() {
HRNGDEVICE=
HRNGSELECT=
RNGDOPTIONS=
test -r /etc/default/rng-tools-debian && . /etc/default/rng-tools-debian
HRNGDEVICE_=
}
hrngselect() {
test -z "$HRNGSELECT" || printf '%s' "$HRNGSELECT" \
>/sys/devices/virtual/misc/hw_random/rng_current
}
finddevice() {
if test -n "$HRNGDEVICE" && test -c "$HRNGDEVICE"; then
# use it unseen
HRNGDEVICE_=
return 0
fi
# list of devices to try/auto-detect
for x in hw_random hwrandom intel_rng i810_rng hwrng; do
for y in /dev /dev/misc; do
test -c "$y/$x" || continue
if timeout -k 1s 5s \
dd if="$y/$x" bs=1 count=1 >/dev/null 2>&1; then
HRNGDEVICE=$y/$x
HRNGDEVICE_=auto
return 0
fi
logger -t rng-tools-debian \
"found $y/$x but could not use it"
done
done
return 1
}
skipdevice() {
case $HRNGDEVICE_:$HRNGDEVICE in
(auto:/dev/hwrng|auto:/dev/misc/hwrng)
return 0 ;;
(*)
return 1 ;;
esac
}
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