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#!/bin/sh
# Copyright 2006 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# dnsmasq-resolv.conf updater
# Written by Roy Marples (uberlord@gentoo.org)
# This is very important!
# We assume that we are a local dns cache - after all, why would a server
# use resolvconf?
# Now that we have assumed this, we also assume that generic DHCP clients
# will enter their domains and search domains ONLY in the "search" field
# in their resolv.confs and VPN clients will put the domain they are for
# into the domain field only.
# This allows dnsmasq to forward domains for a specific VPN domain to the
# VPN nameserver and everything else to the standard name servers.
# A sample dnsmasq config that works as above is like so
#domain-needed
#interface=lo
#resolv-file=/etc/dnsmasq-resolv.conf
#conf-file=/etc/dnsmasq-resolvconf.conf
# The last step is to configure dns configuration for /etc/resolv.conf
# for the lo interface. In Gentoo we set it up like so in /etc/conf.d/net
#dns_servers_lo="127.0.0.1"
# Load our variables from resolvconf
VARS="$(resolvconf -v)"
eval "${VARS}"
DNSMASQRESOLV="/etc/dnsmasq-resolv.conf"
DNSMASQCONF="/etc/dnsmasq-resolvconf.conf"
NEWCONF="# Generated by resolvconf"
NEWRESOLV="${NEWCONF}\nsearch"
# Using DBUS means that we never have to restart the daemon
# This is important as it means we should not drop DNS queries
# whilst changing DNS options around. However, DBUS support is optional
# so we need to validate a few things first.
# Check for DBus support in the binary
DBUS=no
if dnsmasq --version 2>/dev/null | \
grep -q "^Compile time options.*[[:space:]]DBus[[:space:]]" \
; then
# Sanity - check that dnsmasq and dbus are running
if [ -x /etc/init.d/dbus -a -x /etc/init.d/dnsmasq ] ; then
if /etc/init.d/dbus --quiet status && /etc/init.d/dnsmasq --quiet status ; then
DBUS=yes
NEWCONF="${NEWCONF}\n# Domain specific servers will be sent over dbus\n\nenable-dbus"
fi
fi
fi
uniqify() {
local result=
while [ -n "$1" ] ; do
case " ${result} " in
*" $1 "*) ;;
*) result="${result} $1" ;;
esac
shift
done
echo "${result# *}"
}
# If we only have domain information then put it in search too
[ -z "${NEWSEARCH}" -a -z "${NEWNS}" ] && NEWSEARCH="${NEWDOMAIN}"
for N in ${NEWSEARCH} ; do
case " ${NEWSL} " in
*" ${N%,*} "*) ;;
*) NEWSL="${NEWSL} ${N%,*}" ;;
esac
case "\n${NEWRESOLV}\n" in
*"\nnameserver ${N#*,}\n"*) ;;
*) NEWRESOLV="${NEWRESOLV}\nnameserver ${N#*,}" ;;
esac
done
for N in ${NEWNS} ; do
case "\n${NEWRESOLV}\n" in
*"\nnameserver ${N}\n") ;;
*) NEWRESOLV="${NEWRESOLV}\nnameserver ${N}" ;;
esac
done
NEWRESOLV="$(echo "${NEWRESOLV}" | sed -e "s/^search/${NEWSL:+search${NEWSL}}/g")"
DBUSDEST=
for DN in $(uniqify ${NEWDOMAIN}) ; do
if [ "${DBUS}" = "yes" ] ; then
IP=${DN#*,}
SIFS=${IFS-y} OIFS=$IFS
IFS=.
set -- ${IP}
NUM="0x$(printf "%02x" $1 $2 $3 $4)"
if [ "${SIFS}" = "y" ] ; then
IFS=$OIFS
else
unset IFS
fi
DBUSDEST="${DBUSDEST} uint32:$(printf "%d" ${NUM}) string:${DN%,*}"
else
NEWCONF="${NEWCONF}\nserver=/${DN%,*}/${DN#*,}"
fi
done
RELOAD="no"
if [ -e "${DNSMASQCONF}" ] ; then
if [ "$(cat "${DNSMASQCONF}")" != "$(printf "${NEWCONF}")" ] ; then
RELOAD="yes"
printf "${NEWCONF}" > "${DNSMASQCONF}"
fi
else
RELOAD="yes"
printf "${NEWCONF}" > "${DNSMASQCONF}"
fi
if [ -e "${DNSMASQRESOLV}" ] ; then
if [ "$(cat "${DNSMASQRESOLV}")" != "$(printf "${NEWRESOLV}")" ] ; then
RELOAD="yes"
printf "${NEWRESOLV}" > "${DNSMASQRESOLV}"
fi
else
# dnsmasq polls this file so no need to set RELOAD="yes"
printf "${NEWRESOLV}" > "${DNSMASQRESOLV}"
fi
if [ "${RELOAD}" = "yes" -a -x /etc/init.d/dnsmasq ] ; then
/etc/init.d/dnsmasq --quiet --nodeps conditionalrestart
fi
if [ "${DBUS}" = "yes" ] ; then
if [ "${RELOAD}" != "yes" -a -x /etc/init.d/dnsmasq ] ; then
/etc/init.d/dnsmasq --quiet reload
fi
# Send even if emtpy so old servers are cleared
dbus-send --system --dest=uk.org.thekelleys.dnsmasq \
/uk/org/thekelleys/dnsmasq uk.org.thekelleys.SetServers \
${DBUSDEST}
fi
# vim: ts=4 :
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