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