126 lines
4.0 KiB
Bash
126 lines
4.0 KiB
Bash
#!/bin/sh
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# Copyright (c) 2007-2009 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 "$dnsmasq_conf" -a -z "$dnsmasq_resolv" ] && exit 0
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[ -z "$RESOLVCONF" ] && eval "$(@PREFIX@/sbin/resolvconf -v)"
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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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: ${dnsmasq_service:=dnsmasq}
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: ${dnsmasq_restart:=@RESTARTCMD ${dnsmasq_service}@}
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newconf="# Generated by resolvconf\n"
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newresolv="$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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: ${dbus_pid:=/var/run/dbus/dbus.pid}
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[ -s "$dbus_pid" ] || dbus_pid=/var/run/dbus.pid
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[ -s "$dbus_pid" ] || dbus_pid=/var/run/dbus/pid
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if [ -s "$dbus_pid" -a -s "$dnsmasq_pid" ]; then
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if dnsmasq --version 2>/dev/null | \
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grep -q "^Compile time options.*[[:space:]]DBus[[:space:]]"
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then
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# Sanity - check that dnsmasq and dbus are running
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if kill -0 $(cat "$dbus_pid") 2>/dev/null && \
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kill -0 $(cat "$dnsmasq_pid") 2>/dev/null
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then
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dbus=true
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newconf="$newconf\n# Domain specific servers will"
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newconf="$newconf be sent over dbus\nenable-dbus\n"
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fi
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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\n"
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done
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dbusdest=
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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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if $dbus; then
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SIFS=${IFS-y} OIFS=$IFS
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IFS=.
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set -- ${ns%%,*}
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num="0x$(printf "%02x" $1 $2 $3 $4)"
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if [ "$SIFS" = yi ]; 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:$dn"
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else
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newconf="${newconf}server=/$dn/${ns%%,*}\n"
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fi
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[ "$ns" = "${ns#*,}" ] && break
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ns="${ns#*,}"
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done
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done
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changed=false
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if [ -n "$dnsmasq_conf" ]; then
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if [ ! -f "$dnsmasq_conf" ] || \
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[ "$(cat "$dnsmasq_conf")" != "$(printf "$newconf")" ]
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then
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changed=true
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printf "$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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if [ -f "$dnsmasq_resolv" ]; then
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if [ "$(cat "$dnsmasq_resolv")" != "$(printf "$newresolv")" ]
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then
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changed=true
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printf "$newresolv" >"$dnsmasq_resolv"
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fi
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else
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# dnsmasq polls this file so no need to set changed=true
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printf "$newresolv" >"$dnsmasq_resolv"
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fi
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fi
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if $changed; then
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eval $dnsmasq_restart
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fi
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if $dbus; then
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$changed || kill -HUP $(cat "$dnsmasq_pid")
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# Send even if empty so old servers are cleared
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dbus-send --system --dest=uk.org.thekelleys.dnsmasq \
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/uk/org/thekelleys/dnsmasq uk.org.thekelleys.SetServers \
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$dbusdest
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fi
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