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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'
#
##############################################################################
. /lib/functions.sh
. /usr/lib/unbound/defaults.sh
##############################################################################
odhcpd_zonedata() {
local longconf dateconf
local dns_ls_add=$UNBOUND_VARDIR/dhcp_dns.add
local dns_ls_del=$UNBOUND_VARDIR/dhcp_dns.del
local dhcp_ls_new=$UNBOUND_VARDIR/dhcp_lease.new
local dhcp_ls_old=$UNBOUND_VARDIR/dhcp_lease.old
local dhcp_ls_add=$UNBOUND_VARDIR/dhcp_lease.add
local dhcp_ls_del=$UNBOUND_VARDIR/dhcp_lease.del
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 [ "$dhcp_link" = "odhcpd" \
-a -f "$dhcp_origin" \
-a -n "$dhcp_domain" ] ; then
# Capture the lease file which could be changing often
sort $dhcp_origin > $dhcp_ls_new
if [ ! -f $UNBOUND_DHCP_CONF -o ! -f $dhcp_ls_old ] ; then
longconf=2
else
dateconf=$(( $( date +%s ) - $( date -r $UNBOUND_DHCP_CONF +%s ) ))
if [ $dateconf > 150 ] ; then
longconf=1
else
longconf=0
fi
fi
if [ $longconf -gt 0 ] ; then
# Go through the messy business of coding up A, AAAA, and PTR records
# This static conf will be available if Unbound restarts asynchronously
awk -v hostfile=$UNBOUND_DHCP_CONF -v domain=$dhcp_domain \
-v bslaac=$dhcp4_slaac6 -v bisolt=0 -v bconf=1 \
-f /usr/lib/unbound/odhcpd.awk $dhcp_ls_new
fi
if [ $longconf -lt 2 ] ; then
# Deleting and adding all records into Unbound can be a burden in a
# high density environment. Use unbound-control incrementally.
sort $dhcp_ls_old $dhcp_ls_new $dhcp_ls_new | uniq -u > $dhcp_ls_del
awk -v hostfile=$dns_ls_del -v domain=$dhcp_domain \
-v bslaac=$dhcp4_slaac6 -v bisolt=0 -v bconf=0 \
-f /usr/lib/unbound/odhcpd.awk $dhcp_ls_del
sort $dhcp_ls_new $dhcp_ls_old $dhcp_ls_old | uniq -u > $dhcp_ls_add
awk -v hostfile=$dns_ls_add -v domain=$dhcp_domain \
-v bslaac=$dhcp4_slaac6 -v bisolt=0 -v bconf=0 \
-f /usr/lib/unbound/odhcpd.awk $dhcp_ls_add
else
awk -v hostfile=$dns_ls_add -v domain=$dhcp_domain \
-v bslaac=$dhcp4_slaac6 -v bisolt=0 -v bconf=0 \
-f /usr/lib/unbound/odhcpd.awk $dhcp_ls_new
fi
if [ -f "$dns_ls_del" ] ; then
cat $dns_ls_del | $UNBOUND_CONTROL_CFG local_datas_remove
fi
if [ -f "$dns_ls_add" ] ; then
cat $dns_ls_add | $UNBOUND_CONTROL_CFG local_datas
fi
# prepare next round
mv $dhcp_ls_new $dhcp_ls_old
rm -f $dns_ls_del $dns_ls_add $dhcp_ls_del $dhcp_ls_add
fi
}
##############################################################################
odhcpd_zonedata
##############################################################################