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#!/bin/sh
##############################################################################
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# Copyright (C) 2016 Eric Luehrsen
#
##############################################################################
#
# This component needs to be used within the unbound.sh as an include. It uses
# defaults and UCI scope variables defined there. It will copy root.key back
# to /etc/unbound/ periodically, but avoid ROM flash abuse (UCI option).
#
##############################################################################
rootzone_uci() {
local cfg=$1
# This will likely be called outside of "start_service()" context
config_get_bool UNBOUND_B_DNSSEC "$cfg" validator 0
config_get_bool UNBOUND_B_NTP_BOOT "$cfg" validator_ntp 1
config_get UNBOUND_N_ROOT_AGE "$cfg" root_age 30
}
##############################################################################
roothints_update() {
# TODO: Might not be implemented. Unbound doesn't natively update hints.
# Unbound philosophy is built in root hints are good for machine life.
return 0
}
##############################################################################
rootkey_update() {
local basekey_date rootkey_date rootkey_age filestuff
if [ "$UNBOUND_N_ROOT_AGE" -gt 90 -o "$UNBOUND_B_DNSSEC" -lt 1 ] ; then
# Feature disabled
return 0
elif [ "$UNBOUND_B_NTP_BOOT" -gt 0 -a ! -f "$UNBOUND_TIMEFILE" ] ; then
# We don't have time yet
return 0
fi
if [ -f /etc/unbound/root.key ] ; then
basekey_date=$( date -r /etc/unbound/root.key +%s )
else
# No persistent storage key
basekey_date=$( date -d 2000-01-01 +%s )
fi
if [ -f "$UNBOUND_KEYFILE" ] ; then
# Unbound maintains it itself
rootkey_date=$( date -r $UNBOUND_KEYFILE +%s )
rootkey_age=$(( (rootkey_date - basekey_date) / 86440 ))
elif [ -x "$UNBOUND_ANCHOR" ] ; then
# No tmpfs key - use unbound-anchor
rootkey_date=$( date -I +%s )
rootkey_age=$(( (rootkey_date - basekey_date) / 86440 ))
$UNBOUND_ANCHOR -a $UNBOUND_KEYFILE
else
# give up
rootkey_age=0
fi
if [ "$rootkey_age" -gt "$UNBOUND_N_ROOT_AGE" ] ; then
filestuff=$( cat $UNBOUND_KEYFILE )
case "$filestuff" in
*NOERROR*)
# Header comment for drill and dig
logger -t unbound -s "root.key updated after $rootkey_age days"
cp -p $UNBOUND_KEYFILE /etc/unbound/root.key
;;
*"state=2 [ VALID ]"*)
# Comment inline to key for unbound-anchor
logger -t unbound -s "root.key updated after $rootkey_age days"
cp -p $UNBOUND_KEYFILE /etc/unbound/root.key
;;
*)
logger -t unbound -s "root.key still $rootkey_age days old"
;;
esac
fi
}
##############################################################################
rootzone_update() {
# Partial UCI fetch for this functional group
config_load unbound
config_foreach rootzone_uci unbound
# You need root.hints and root.key to boot strap recursion
roothints_update
rootkey_update
}
##############################################################################