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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 script facilitates alternate installation of Unbound+odhcpd and no
# need for dnsmasq. There are some limitations, but it works and is small.
# The lease file is parsed to make "zone-data:" and "local-data:" entries.
#
# config odhcpd 'odhcpd'
# option leasetrigger '/usr/lib/unbound/odhcpd.sh'
#
##############################################################################
# while useful (sh)ellcheck is pedantic and noisy
# shellcheck disable=1091,2002,2004,2034,2039,2086,2094,2140,2154,2155
UB_ODHCPD_BLANK=
##############################################################################
odhcpd_zonedata() {
. /lib/functions.sh
. /usr/lib/unbound/defaults.sh
local dhcp_link=$( uci_get unbound.@unbound[0].dhcp_link )
local dhcp4_slaac6=$( uci_get unbound.@unbound[0].dhcp4_slaac6 )
local dhcp_domain=$( uci_get unbound.@unbound[0].domain )
local dhcp_origin=$( uci_get dhcp.@odhcpd[0].leasefile )
if [ -f "$UB_TOTAL_CONF" ] && [ -f "$dhcp_origin" ] \
&& [ "$dhcp_link" = "odhcpd" ] && [ -n "$dhcp_domain" ] ; then
local longconf dateconf dateoldf
local dns_ls_add=$UB_VARDIR/dhcp_dns.add
local dns_ls_del=$UB_VARDIR/dhcp_dns.del
local dns_ls_new=$UB_VARDIR/dhcp_dns.new
local dns_ls_old=$UB_VARDIR/dhcp_dns.old
local dhcp_ls_new=$UB_VARDIR/dhcp_lease.new
if [ ! -f $UB_DHCP_CONF ] || [ ! -f $dns_ls_old ] ; then
# no old files laying around
touch $dns_ls_old
sort $dhcp_origin > $dhcp_ls_new
longconf=freshstart
else
# incremental at high load or full refresh about each 5 minutes
dateconf=$(( $( date +%s ) - $( date -r $UB_DHCP_CONF +%s ) ))
dateoldf=$(( $( date +%s ) - $( date -r $dns_ls_old +%s ) ))
if [ $dateconf -gt 300 ] ; then
touch $dns_ls_old
sort $dhcp_origin > $dhcp_ls_new
longconf=longtime
elif [ $dateoldf -gt 1 ] ; then
touch $dns_ls_old
sort $dhcp_origin > $dhcp_ls_new
longconf=increment
else
# odhcpd is rapidly updating leases a race condition could occur
longconf=skip
fi
fi
case $longconf in
freshstart)
awk -v conffile=$UB_DHCP_CONF -v pipefile=$dns_ls_new \
-v domain=$dhcp_domain -v bslaac=$dhcp4_slaac6 \
-v bisolt=0 -v bconf=1 \
-f /usr/lib/unbound/odhcpd.awk $dhcp_ls_new
cp $dns_ls_new $dns_ls_add
cp $dns_ls_new $dns_ls_old
cat $dns_ls_add | $UB_CONTROL_CFG local_datas
rm -f $dns_ls_new $dns_ls_del $dns_ls_add $dhcp_ls_new
;;
longtime)
awk -v conffile=$UB_DHCP_CONF -v pipefile=$dns_ls_new \
-v domain=$dhcp_domain -v bslaac=$dhcp4_slaac6 \
-v bisolt=0 -v bconf=1 \
-f /usr/lib/unbound/odhcpd.awk $dhcp_ls_new
awk '{ print $1 }' $dns_ls_old | sort | uniq > $dns_ls_del
cp $dns_ls_new $dns_ls_add
cp $dns_ls_new $dns_ls_old
cat $dns_ls_del | $UB_CONTROL_CFG local_datas_remove
cat $dns_ls_add | $UB_CONTROL_CFG local_datas
rm -f $dns_ls_new $dns_ls_del $dns_ls_add $dhcp_ls_new
;;
increment)
# incremental add and prepare the old list for delete later
# unbound-control can be slow so high DHCP rates cannot run a full list
awk -v conffile=$UB_DHCP_CONF -v pipefile=$dns_ls_new \
-v domain=$dhcp_domain -v bslaac=$dhcp4_slaac6 \
-v bisolt=0 -v bconf=0 \
-f /usr/lib/unbound/odhcpd.awk $dhcp_ls_new
sort $dns_ls_new $dns_ls_old $dns_ls_old | uniq -u > $dns_ls_add
sort $dns_ls_new $dns_ls_old | uniq > $dns_ls_old
cat $dns_ls_add | $UB_CONTROL_CFG local_datas
rm -f $dns_ls_new $dns_ls_del $dns_ls_add $dhcp_ls_new
;;
*)
echo "do nothing" >/dev/null
;;
esac
fi
}
##############################################################################
UB_ODHPCD_LOCK=/tmp/unbound_odhcpd.lock
if [ ! -f $UB_ODHPCD_LOCK ] ; then
# imperfect but it should avoid collisions
touch $UB_ODHPCD_LOCK
odhcpd_zonedata
rm -f $UB_ODHPCD_LOCK
else
UB_ODHCPD_LOCK_AGE=$(( $( date +%s ) - $( date -r $UB_ODHPCD_LOCK +%s ) ))
if [ $UB_ODHCPD_LOCK_AGE -gt 100 ] ; then
# unlock because something likely broke but do not write this time through
rm -f $UB_ODHPCD_LOCK
fi
fi
##############################################################################