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#!/bin/sh # # Script fragment to make ifupdown supply DNS information to resolved # case "$ADDRFAM" in inet|inet6) : ;; *) exit 0 ;; esac if systemctl is-enabled systemd-resolved > /dev/null 2>&1; then interface=$IFACE if [ ! "$interface" ]; then return fi # TODO handle lo interface settings if [ "$interface" = "lo" ]; then return fi ifindex=$(cat "/sys/class/net/$interface/ifindex") if [ ! "$ifindex" ]; then return fi mystatedir=/run/network mkdir -p $mystatedir statedir=/run/systemd/resolve/netif mkdir -p $statedir chown systemd-resolve:systemd-resolve $statedir oldstate="$(mktemp)" # ignore errors due to nonexistent file md5sum "$mystatedir/isc-dhcp-v4-$interface" "$mystatedir/isc-dhcp-v6-$interface" "$mystatedir/ifupdown-inet-$interface" "$mystatedir/ifupdown-inet6-$interface" > "$oldstate" 2> /dev/null || true NEW_DEFAULT_ROUTE=$IF_DNS_DEFAULT_ROUTE NEW_DNS=$(echo $IF_DNS_NAMESERVERS $IF_DNS_NAMESERVER) NEW_DOMAINS=$(echo $IF_DNS_DOMAIN $IF_DNS_SEARCH) DNS=DNS DOMAINS=DOMAINS if [ "$ADDRFAM" = "inet6" ]; then DNS=DNS6 DOMAINS=DOMAINS6 fi if [ -n "$NEW_DNS" ]; then cat <<EOF >"$mystatedir/ifupdown-${ADDRFAM}-$interface" "$DNS"="$NEW_DNS" EOF if [ -n "$NEW_DOMAINS" ]; then cat <<EOF >>"$mystatedir/ifupdown-${ADDRFAM}-$interface" "$DOMAINS"="$NEW_DOMAINS" EOF fi fi case "$NEW_DEFAULT_ROUTE" in 1|yes|true|on) NEW_DEFAULT_ROUTE=yes ;; 0|no|false|off) NEW_DEFAULT_ROUTE=no ;; *) NEW_DEFAULT_ROUTE= ;; esac if [ -n "$NEW_DEFAULT_ROUTE" ]; then cat <<EOF >>"$mystatedir/ifupdown-${ADDRFAM}-$interface" DEFAULT_ROUTE="$NEW_DEFAULT_ROUTE" EOF fi newstate="$(mktemp)" # ignore errors due to nonexistent file md5sum "$mystatedir/isc-dhcp-v4-$interface" "$mystatedir/isc-dhcp-v6-$interface" "$mystatedir/ifupdown-inet-$interface" "$mystatedir/ifupdown-inet6-$interface" > "$newstate" 2> /dev/null || true if ! cmp --silent "$oldstate" "$newstate" 2>/dev/null; then DNS DNS6 DOMAINS DOMAINS6 DEFAULT_ROUTE # v4 first if [ -e "$mystatedir/isc-dhcp-v4-$interface" ]; then . "$mystatedir/isc-dhcp-v4-$interface" fi # v4 manual config overrides if [ -e "$mystatedir/ifupdown-inet-$interface" ]; then . "$mystatedir/ifupdown-inet-$interface" fi # v6 preffered if [ -e "$mystatedir/isc-dhcp-v6-$interface" ]; then . "$mystatedir/isc-dhcp-v6-$interface" fi # v6 manual config overrides if [ -e "$mystatedir/ifupdown-inet6-$interface" ]; then . "$mystatedir/ifupdown-inet6-$interface" fi resolvectl_failed= if [ "$DNS" ] || [ "$DNS6" ] ; then cat <<EOF >"$statedir/$ifindex" # This is private data. Do not parse. LLMNR=yes MDNS=no SERVERS=$(echo $DNS6 $DNS) DOMAINS=$(echo $DOMAINS6 $DOMAINS) EOF if [ -n "$DEFAULT_ROUTE" ]; then cat <<EOF >>"$statedir/$ifindex" DEFAULT_ROUTE=$DEFAULT_ROUTE EOF fi chown systemd-resolve:systemd-resolve "$statedir/$ifindex" # In addition to creating the state file (needed if we run before # resolved is started), also feed the information directly to # resolved. if systemctl --quiet is-active systemd-resolved; then resolvectl llmnr "$ifindex" yes || resolvectl_failed=$? resolvectl mdns "$ifindex" no || resolvectl_failed=$? if [ "$DOMAINS6" ] || [ "$DOMAINS" ]; then resolvectl domain "$ifindex" $DOMAINS6 $DOMAINS || resolvectl_failed=$? else resolvectl domain "$ifindex" "" || resolvectl_failed=$? fi resolvectl dns "$ifindex" $DNS6 $DNS || resolvectl_failed=$? if [ "$DEFAULT_ROUTE" ]; then resolvectl default-route "$ifindex" $DEFAULT_ROUTE || resolvectl_failed=$? fi fi else rm -f "$statedir/$ifindex" if systemctl --quiet is-active systemd-resolved; then resolvectl revert "$ifindex" || resolvectl_failed=$? fi fi # resolved was running, but without dbus, it means state files # will not be read & resolvectl commands failed, restart it if [ "$resolvectl_failed" ]; then systemctl try-restart systemd-resolved fi fi rm -f "$oldstate" "$newstate" fi