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#!/bin/sh
to_subnet() {
pref=$1
case "$pref" in
*.*.*.*) echo $pref/32;;
*.*.*) echo $pref.0/24;;
*.*) echo $pref.0.0/16;;
*) echo $pref.0.0.0/8;;
esac
}
gen_config() {
echo "# Config generated by $0, $(date)"
echo "server:"
echo -e "\troot-hints: /usr/share/dns-root-hints/named.root\n"
[ -n "$IP" ] && echo -e "\tinterface: $IP\n"
[ -n "$IPSEND" ] && echo -e "\toutgoing-interface: $IPSEND\n"
for i in $access_control; do
echo -e "\taccess-control: $i allow"
done
echo ""
# stub zones
local zonefile ip
local fwdtype="stub"
if [ -n "$FORWARDONLY" ]; then
fwdtype="forward"
fi
for zonefile in "$root"/etc/dnscache/servers/*; do
local zone=${zonefile##*/}
case "$zone" in
'@'|'*'|*.apk-new) continue;;
esac
echo "${fwdtype}-zone:"
echo -e "\tname: ${zone}"
for ip in $(cat $zonefile); do
echo -e "\t${fwdtype}-addr: $ip"
done
echo ""
done
}
usage() {
cat >&2 <<EOF
usage: $0 [-h] [-r ROOT]
Migrate dnscache configuration to unbound
This tool will install unbound, migrate the configuration, stop dnscache
and start unbound and remove traces of dnscache.
Options:
-c Only dump the config to stdout and exit
-h Show this help
-k Keep unbound.conf.backup and keep dnscache config
-r Look for dnscache config in ROOT/etc/dnscache
EOF
}
root=${ROOT:-/}
dump_config=false
quiet=false
keep_backup=false
while getopts "chr:" opt; do
case "$opt" in
'c') dump_config=true;;
'h') usage; exit;;
'k') keep_backup=true;;
'r') root="$OPTARG";;
'q') quiet=true; quiet_opt=--quiet;;
esac
done
unbound_conf=${UNBOUND_CONF:-${root%/}/etc/unbound/unbound.conf}
# read dnscache config
if ! [ -f "$root"/etc/conf.d/dnscache ] && ! [ -d "$root"/etc/dnscache ]; then
echo "No dnscache config found"
exit 1
fi
confd="$root"/etc/conf.d/dnscache
if [ -r "$confd" ]; then
. "$confd"
fi
interface="$IP"
outgoing_interface="$IPSEND"
for i in "$root"/etc/dnscache/ip/*; do
[ -f "$i" ] || continue
access_control="$access_control $(to_subnet ${i##*/})"
done
if $dump_config; then
gen_config
exit 0
fi
# install unbound if needed
if ! apk info -e unbound; then
apk add $quiet_opt unbound
fi
# generate config
if [ -f "$unbound_conf" ]; then
$quiet || echo "Backing up $unbound_conf" >&2
mv "$unbound_conf" "${unbound_conf}".backup
fi
$quiet || echo "Generating $unbound_conf" >&2
gen_config > "$unbound_conf"
# stop dnscache and start unbound
if /etc/init.d/dnscache --quiet status 2>/dev/null; then
/etc/init.d/dnscache $quiet_opt stop
if ! /etc/init.d/unbound $quiet_opt start; then
echo "Failed to start unbound. Starting up dnscache again"
/etc/init.d/dnscache $quiet_opt start
exit 1
fi
fi
# update runlevels
errors=0
if rc-update | grep -q -w dnscache; then
runlevels=$(rc-update | awk '$1 == "dnscache" { FS="|"; $0 = $0; print $2 }')
for level in $runlevels; do
rc-update $quiet_opt add unbound $level \
|| errors=$(($errors + 1))
rc-update $quiet_opt del dnscache $level \
|| errors=$(($errors + 1))
done
fi
# cleanup if requested
if [ $errors -eq 0 ] && ! $keep_backup ; then
$quiet || echo "Purging dnscache and dnscache config" >&2
apk del --purge $quiet_opt dnscache
rm -rf $root/etc/dnscache $root/etc/conf.d/dnscache
$quiet || echo "Purging ${unbound_conf}.backup" >&2
rm -rf ${unbound_conf}.backup
fi
exit $errors
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