#!/bin/sh
# Copyright (c) 2007-2019 Roy Marples
# All rights reserved
# dnsmasq subscriber for resolvconf
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials provided
# with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
[ -f "@SYSCONFDIR@"/resolvconf.conf ] || exit 0
. "@SYSCONFDIR@/resolvconf.conf" || exit 1
[ -z "${dnsmasq_conf}${dnsmasq_resolv}" ] && exit 0
[ -z "$RESOLVCONF" ] && eval "$(@SBINDIR@/resolvconf -v)"
NL="
"
: ${dnsmasq_pid:=/var/run/dnsmasq.pid}
[ -s "$dnsmasq_pid" ] || dnsmasq_pid=/var/run/dnsmasq/dnsmasq.pid
[ -s "$dnsmasq_pid" ] || unset dnsmasq_pid
: ${dnsmasq_service:=dnsmasq}
newconf="# Generated by resolvconf$NL"
newresolv="$newconf"
# Using dbus means that we never have to restart the daemon
# This is important as it means we should not drop DNS queries
# whilst changing DNS options around. However, dbus support is optional
# so we need to validate a few things first.
# Check for DBus support in the binary
dbus=false
dbus_ex=false
dbus_introspect=$(dbus-send --print-reply --system \
--dest=uk.org.thekelleys.dnsmasq \
/uk/org/thekelleys/dnsmasq \
org.freedesktop.DBus.Introspectable.Introspect \
2>/dev/null)
if [ $? = 0 ]; then
dbus=true
if printf %s "$dbus_introspect" | \
grep -q '<method name="SetDomainServers">'
then
dbus_ex=true
fi
fi
for n in $NAMESERVERS; do
newresolv="${newresolv}nameserver $n$NL"
done
dbusdest=
dbusdest_ex=
conf=
for d in $DOMAINS; do
dn="${d%%:*}"
ns="${d#*:}"
while [ -n "$ns" ]; do
n="${ns%%,*}"
if $dbus && ! $dbus_ex; then
case "$n" in
*.*.*.*)
SIFS=${IFS-y} OIFS=$IFS
IFS=.
set -- $n
num="0x$(printf %02x $1 $2 $3 $4)"
if [ "$SIFS" = y ]; then
unset IFS
else
IFS=$OIFS
fi
dbusdest="$dbusdest uint32:$(printf %u $num)"
dbusdest="$dbusdest string:$dn"
;;
*:*%*)
# This version of dnsmasq won't accept
# scoped IPv6 addresses
dbus=false
;;
*:*)
SIFS=${IFS-y} OIFS=$IFS bytes= front= back=
empty=false i=0
IFS=:
set -- $n
while [ -n "$1" ] || [ -n "$2" ]; do
addr="$1"
shift
if [ -z "$addr" ]; then
empty=true
continue
fi
i=$(($i + 1))
while [ ${#addr} -lt 4 ]; do
addr="0${addr}"
done
byte1="$(printf %d 0x${addr%??})"
byte2="$(printf %d 0x${addr#??})"
if $empty; then
back="$back byte:$byte1 byte:$byte2"
else
front="$front byte:$byte1 byte:$byte2"
fi
done
while [ $i != 8 ]; do
i=$(($i + 1))
front="$front byte:0 byte:0"
done
front="${front}$back"
if [ "$SIFS" = y ]; then
unset IFS
else
IFS=$OIFS
fi
dbusdest="${dbusdest}$front string:$dn"
;;
*)
if ! $dbus_ex; then
dbus=false
fi
;;
esac
fi
dbusdest_ex="$dbusdest_ex${dbusdest_ex:+,}/$dn/$n"
conf="${conf}server=/$dn/$n$NL"
[ "$ns" = "${ns#*,}" ] && break
ns="${ns#*,}"
done
done
if $dbus; then
newconf="$newconf$NL# Domain specific servers will"
newconf="$newconf be sent over dbus${NL}"
else
newconf="$newconf$conf"
fi
# Try to ensure that config dirs exist
if type config_mkdirs >/dev/null 2>&1; then
config_mkdirs "$dnsmasq_conf" "$dnsmasq_resolv"
else
@SBINDIR@/resolvconf -D "$dnsmasq_conf" "$dnsmasq_resolv"
fi
changed=false
if [ -n "$dnsmasq_conf" ]; then
if [ ! -f "$dnsmasq_conf" ] || \
[ "$(cat "$dnsmasq_conf")" != "$(printf %s "$newconf")" ]
then
changed=true
printf %s "$newconf" >"$dnsmasq_conf"
fi
fi
if [ -n "$dnsmasq_resolv" ]; then
# dnsmasq polls this file so no need to set changed=true
if [ -f "$dnsmasq_resolv" ]; then
if [ "$(cat "$dnsmasq_resolv")" != "$(printf %s "$newresolv")" ]
then
printf %s "$newresolv" >"$dnsmasq_resolv"
fi
else
printf %s "$newresolv" >"$dnsmasq_resolv"
fi
fi
if $changed; then
# dnsmasq does not re-read the configuration file on SIGHUP
if [ -n "$dnsmasq_restart" ]; then
eval $dnsmasq_restart
elif [ -n "$RESTARTCMD" ]; then
set -- ${dnsmasq_service}
eval "$RESTARTCMD"
else
@SBINDIR@/resolvconf -r ${dnsmasq_service}
fi
fi
if $dbus; then
if [ -s "$dnsmasq_pid" ]; then
$changed || kill -HUP $(cat "$dnsmasq_pid")
fi
# Send even if empty so old servers are cleared
if $dbus_ex; then
method=SetDomainServers
if [ -n "$dbusdest_ex" ]; then
dbusdest_ex="array:string:$dbusdest_ex"
fi
dbusdest="$dbusdest_ex"
else
method=SetServers
fi
dbus-send --system --dest=uk.org.thekelleys.dnsmasq \
/uk/org/thekelleys/dnsmasq uk.org.thekelleys.$method \
$dbusdest
dbus-send --system --dest=uk.org.thekelleys.dnsmasq \
/uk/org/thekelleys/dnsmasq uk.org.thekelleys.ClearCache
fi