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#!/bin/bash -eu
# note: need bash because of ${...//X/Y} syntax
#
# Script to update the maradns upstream server list
#
# Resolvconf may run even if maradns is not running. In that case, we update
# update the configuration file but do not restart the daemon.
# Otherwise, maradns is only restarted if the configuration file changed.
#
# If you want to use this script, set your upstream_servers["."] variable to
# "resolvconf_nameservers" (see $IPV4_ALIAS value below)
IPV4_ALIAS=resolvconf_nameservers
# E.g.: upstream_servers["."] = "resolvconf_nameservers"
#
# This only works with the main maradns server, using configuration file
# /etc/maradns/mararc. Patches to extend this functionality to multiple servers
# are welcome.
#
# Note: you need to enable this functionality in /etc/default/maradns because
# this script modifies a configuration file in /etc, which you may not like.
#
# (c) 2006 Martin F. Krafft <madduck@debian.org>
# Released under the terms of the Artistic Licence.
#
PATH=/usr/sbin:/usr/bin:/sbin:/bin
DEFAULT=/etc/default/maradns
[ -f $DEFAULT ] && . $DEFAULT
if [ -z "${RESOLVCONF_UPDATE_FORWARDERS:-}" ]; then
echo "Warning: \$RESOLVCONF_UPDATE_FORWARDERS not defined in $DEFAULT." >&2
echo " Pulling the emergency brake..." >&2
exit 0
fi
case $RESOLVCONF_UPDATE_FORWARDERS in
y*|Y*|1|on|On|true|True|TRUE) :;;
*)
echo "Not updating maradns, disabled in $DEFAULT." >&2
exit 0
;;
esac
# fail silently if resolvconf is not installed.
LISTRECS=/lib/resolvconf/list-records
[ -x $LISTRECS ] || exit 0
IFACEDIR=/etc/resolvconf/run/interface
[ -d $IFACEDIR ] || exit 0
MARARC=/etc/maradns/mararc
[ -e $MARARC ] || exit 0
[ -w $MARARC ] || exit 1
CSL=""
cd $IFACEDIR
RECORDS=$(/lib/resolvconf/list-records)
if [ -n "$RECORDS" ]; then
IPS=$(sed -ne 's,^nameserver ,,p' $RECORDS)
for ip in $IPS; do
ifconfig -a | grep -q " inet addr:${ip//./\.}" || CSL=${CSL}${CSL:+,}$ip
done
fi
[ -n "$CSL" ] || exit 0
IPV4ALIAS_REGEXP="ipv4_alias\[\"$IPV4_ALIAS\"\]"
CHANGED=0
if grep -q $IPV4ALIAS_REGEXP $MARARC; then
HASHSUM=$(md5sum $MARARC)
SEDSCRIPT="s@^\($IPV4ALIAS_REGEXP\)[[:space:]]*=.*@\1 = \"$CSL\"@"
sed -i -e "$SEDSCRIPT" $MARARC
[ "$HASHSUM" != "$(md5sum $MARARC)" ] && CHANGED=1
else
# See http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=436209
#echo "${IPV4ALIAS_REGEXP//\\\\/} = \"$CSL\"" >> $MARARC
echo "${IPV4ALIAS_REGEXP//\\/} = \"$CSL\"" >> $MARARC
CHANGED=1
fi
MARAINIT=/etc/init.d/maradns
if [ -x $MARAINIT ] && [ $CHANGED -eq 1 ]; then
ps -fC maradns | grep -q $MARARC && exec $MARAINIT restart
fi
exit 0
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