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#!/bin/sh
PREFIX=
. "$PREFIX/lib/libalpine.sh"
usage() {
cat <<-__EOF__
usage: setup-dns [-h] [-d domain name] [IPADDR...]
Setup ${ROOT}etc/resolv.conf DNS settings
options:
-h Show this help
-d specify search domain name
The optional IPADDR are a list of DNS servers to use.
__EOF__
exit 1
}
while getopts "d:n:h" opt; do
case $opt in
d) DOMAINNAME="$OPTARG";;
h) usage;;
n) NAMESERVERS="$OPTARG";;
esac
done
shift $(($OPTIND - 1))
conf="${ROOT}etc/resolv.conf"
if [ -f "$conf" ] ; then
domain=$(awk '/^domain/ {print $2}' $conf)
dns=$(awk '/^nameserver/ {printf "%s ",$2}' $conf)
elif fqdn="$(get_fqdn)" && [ -n "$fqdn" ]; then
domain="$fqdn"
fi
if [ -n "$DOMAINNAME" ];then
domain="$DOMAINNAME"
else
ask "DNS domain name? (e.g 'bar.com')" "$domain"
domain="$resp"
fi
if [ -n "$NAMESERVERS" ] || [ $# -gt 0 ];then
dns="$NAMESERVERS"
else
ask "DNS nameserver(s)?" "${dns% }"
dns="$(echo $resp | tr ',' ' ')"
fi
if [ "$domain" != "" ]; then
mkdir -p "${conf%/*}"
echo "search $domain" > $conf
fi
if [ -n "$dns" ] || [ $# -gt 0 ] && [ -f "$conf" ]; then
sed -i -e '/^nameserver/d' $conf
fi
for i in $dns $@; do
mkdir -p "${conf%/*}"
echo "nameserver $i" >> $conf
done
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