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98 lines
3.5 KiB
98 lines
3.5 KiB
#!/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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# Common file location definitions
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. /usr/lib/unbound/unbound.sh
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##############################################################################
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odhcpd_settings() {
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# This trigger is out of normal init context, so we need to read some UCI.
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local cfg="$1"
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config_get UNBOUND_D_DHCP_LINK "$cfg" dhcp_link none
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config_get_bool UNBOUND_B_SLAAC6_MAC "$cfg" dhcp4_slaac6 0
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}
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##############################################################################
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odhcpd_zonedata() {
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local dns_ls_add=$UNBOUND_VARDIR/dhcp_dns.add
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local dns_ls_del=$UNBOUND_VARDIR/dhcp_dns.del
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local dhcp_ls_new=$UNBOUND_VARDIR/dhcp_lease.new
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local dhcp_ls_old=$UNBOUND_VARDIR/dhcp_lease.old
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local dhcp_ls_add=$UNBOUND_VARDIR/dhcp_lease.add
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local dhcp_ls_del=$UNBOUND_VARDIR/dhcp_lease.del
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local dhcp_origin=$( uci get dhcp.@odhcpd[0].leasefile )
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config_load unbound
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config_foreach odhcpd_settings unbound
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if [ "$UNBOUND_D_DHCP_LINK" = "odhcpd" -a -f "$dhcp_origin" ] ; then
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# Capture the lease file which could be changing often
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cat $dhcp_origin | sort > $dhcp_ls_new
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touch $dhcp_ls_old
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sort $dhcp_ls_new $dhcp_ls_old $dhcp_ls_old | uniq -u > $dhcp_ls_add
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sort $dhcp_ls_old $dhcp_ls_new $dhcp_ls_new | uniq -u > $dhcp_ls_del
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# Go through the messy business of coding up A, AAAA, and PTR records
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# This static conf will be available if Unbound restarts asynchronously
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awk -v hostfile=$UNBOUND_DHCP_CONF -v domain=$UNBOUND_TXT_DOMAIN \
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-v bslaac=$UNBOUND_B_SLAAC6_MAC -v bisolt=0 -v bconf=1 \
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-f /usr/lib/unbound/odhcpd.awk $dhcp_ls_new
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# Deleting and adding all records into Unbound can be a burden in a
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# high density environment. Use unbound-control incrementally.
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awk -v hostfile=$dns_ls_del -v domain=$UNBOUND_TXT_DOMAIN \
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-v bslaac=$UNBOUND_B_SLAAC6_MAC -v bisolt=0 -v bconf=0 \
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-f /usr/lib/unbound/odhcpd.awk $dhcp_ls_del
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awk -v hostfile=$dns_ls_add -v domain=$UNBOUND_TXT_DOMAIN \
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-v bslaac=$UNBOUND_B_SLAAC6_MAC -v bisolt=0 -v bconf=0 \
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-f /usr/lib/unbound/odhcpd.awk $dhcp_ls_add
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if [ -f "$dns_ls_del" ] ; then
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cat $dns_ls_del | $UNBOUND_CONTROL_CFG local_datas_remove
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fi
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if [ -f "$dns_ls_add" ] ; then
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cat $dns_ls_add | $UNBOUND_CONTROL_CFG local_datas
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fi
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# prepare next round
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mv $dhcp_ls_new $dhcp_ls_old
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rm -f $dns_ls_del $dns_ls_add $dhcp_ls_del $dhcp_ls_add
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fi
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}
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##############################################################################
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odhcpd_zonedata
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##############################################################################
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