151 lines
4.9 KiB
Bash
151 lines
4.9 KiB
Bash
#!/bin/sh
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##############################################################################
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 2 as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# Copyright (C) 2016 Eric Luehrsen
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#
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##############################################################################
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#
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# This script facilitates alternate installation of Unbound+odhcpd and no
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# need for dnsmasq. There are some limitations, but it works and is small.
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# The lease file is parsed to make "zone-data:" and "local-data:" entries.
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#
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# config odhcpd 'odhcpd'
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# option leasetrigger '/usr/lib/unbound/odhcpd.sh'
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#
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##############################################################################
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# while useful (sh)ellcheck is pedantic and noisy
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# shellcheck disable=1091,2002,2004,2034,2039,2086,2094,2140,2154,2155
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UB_ODHCPD_BLANK=
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##############################################################################
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odhcpd_zonedata() {
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. /lib/functions.sh
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. /usr/lib/unbound/defaults.sh
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local dhcp_link=$( uci_get unbound.@unbound[0].dhcp_link )
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local dhcp4_slaac6=$( uci_get unbound.@unbound[0].dhcp4_slaac6 )
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local dhcp_domain=$( uci_get unbound.@unbound[0].domain )
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local dhcp_origin=$( uci_get dhcp.@odhcpd[0].leasefile )
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if [ -f "$UB_TOTAL_CONF" ] && [ -f "$dhcp_origin" ] \
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&& [ "$dhcp_link" = "odhcpd" ] && [ -n "$dhcp_domain" ] ; then
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local longconf dateconf dateoldf
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local dns_ls_add=$UB_VARDIR/dhcp_dns.add
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local dns_ls_del=$UB_VARDIR/dhcp_dns.del
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local dns_ls_new=$UB_VARDIR/dhcp_dns.new
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local dns_ls_old=$UB_VARDIR/dhcp_dns.old
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local dhcp_ls_new=$UB_VARDIR/dhcp_lease.new
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if [ ! -f $UB_DHCP_CONF ] || [ ! -f $dns_ls_old ] ; then
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# no old files laying around
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touch $dns_ls_old
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sort $dhcp_origin > $dhcp_ls_new
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longconf=freshstart
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else
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# incremental at high load or full refresh about each 5 minutes
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dateconf=$(( $( date +%s ) - $( date -r $UB_DHCP_CONF +%s ) ))
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dateoldf=$(( $( date +%s ) - $( date -r $dns_ls_old +%s ) ))
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if [ $dateconf -gt 300 ] ; then
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touch $dns_ls_old
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sort $dhcp_origin > $dhcp_ls_new
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longconf=longtime
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elif [ $dateoldf -gt 1 ] ; then
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touch $dns_ls_old
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sort $dhcp_origin > $dhcp_ls_new
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longconf=increment
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else
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# odhcpd is rapidly updating leases a race condition could occur
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longconf=skip
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fi
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fi
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case $longconf in
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freshstart)
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awk -v conffile=$UB_DHCP_CONF -v pipefile=$dns_ls_new \
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-v domain=$dhcp_domain -v bslaac=$dhcp4_slaac6 \
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-v bisolt=0 -v bconf=1 \
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-f /usr/lib/unbound/odhcpd.awk $dhcp_ls_new
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cp $dns_ls_new $dns_ls_add
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cp $dns_ls_new $dns_ls_old
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cat $dns_ls_add | $UB_CONTROL_CFG local_datas
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rm -f $dns_ls_new $dns_ls_del $dns_ls_add $dhcp_ls_new
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;;
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longtime)
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awk -v conffile=$UB_DHCP_CONF -v pipefile=$dns_ls_new \
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-v domain=$dhcp_domain -v bslaac=$dhcp4_slaac6 \
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-v bisolt=0 -v bconf=1 \
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-f /usr/lib/unbound/odhcpd.awk $dhcp_ls_new
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awk '{ print $1 }' $dns_ls_old | sort | uniq > $dns_ls_del
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cp $dns_ls_new $dns_ls_add
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cp $dns_ls_new $dns_ls_old
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cat $dns_ls_del | $UB_CONTROL_CFG local_datas_remove
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cat $dns_ls_add | $UB_CONTROL_CFG local_datas
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rm -f $dns_ls_new $dns_ls_del $dns_ls_add $dhcp_ls_new
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;;
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increment)
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# incremental add and prepare the old list for delete later
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# unbound-control can be slow so high DHCP rates cannot run a full list
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awk -v conffile=$UB_DHCP_CONF -v pipefile=$dns_ls_new \
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-v domain=$dhcp_domain -v bslaac=$dhcp4_slaac6 \
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-v bisolt=0 -v bconf=0 \
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-f /usr/lib/unbound/odhcpd.awk $dhcp_ls_new
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sort $dns_ls_new $dns_ls_old $dns_ls_old | uniq -u > $dns_ls_add
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sort $dns_ls_new $dns_ls_old | uniq > $dns_ls_old
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cat $dns_ls_add | $UB_CONTROL_CFG local_datas
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rm -f $dns_ls_new $dns_ls_del $dns_ls_add $dhcp_ls_new
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;;
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*)
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echo "do nothing" >/dev/null
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;;
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esac
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fi
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}
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##############################################################################
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UB_ODHPCD_LOCK=/tmp/unbound_odhcpd.lock
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if [ ! -f $UB_ODHPCD_LOCK ] ; then
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# imperfect but it should avoid collisions
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touch $UB_ODHPCD_LOCK
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odhcpd_zonedata
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rm -f $UB_ODHPCD_LOCK
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else
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UB_ODHCPD_LOCK_AGE=$(( $( date +%s ) - $( date -r $UB_ODHPCD_LOCK +%s ) ))
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if [ $UB_ODHCPD_LOCK_AGE -gt 100 ] ; then
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# unlock because something likely broke but do not write this time through
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rm -f $UB_ODHPCD_LOCK
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fi
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fi
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##############################################################################
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