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#!/bin/sh ## Sourced, not exec'ed, but helps syntax highlighting # # Script fragment to make dhclient supply nameserver information to resolved # # Tips: # * Be careful about changing the environment since this is sourced # * This script fragment uses bash features # * As of isc-dhcp-client 4.2 the "reason" (for running the script) can be one of the following. # (Listed on man page:) MEDIUM(0) PREINIT(0) BOUND(M) RENEW(M) REBIND(M) REBOOT(M) EXPIRE(D) FAIL(D) RELEASE(D) STOP(D) NBI(-) TIMEOUT(M) # (Also used in master script:) ARPCHECK(0), ARPSEND(0) # (Also used in master script:) PREINIT6(0) BOUND6(M) RENEW6(M) REBIND6(M) DEPREF6(0) EXPIRE6(D) RELEASE6(D) STOP6(D) # (0) = master script does not run make_resolv_conf # (M) = master script runs make_resolv_conf # (D) = master script downs interface # (-) = master script does nothing with this if systemctl is-enabled systemd-resolved > /dev/null 2>&1; then local mystatedir statedir ifindex if [ ! "$interface" ] ; then return fi ifindex=$(cat "/sys/class/net/$interface/ifindex") if [ ! "$ifindex" ]; then return fi mystatedir=/run/network mkdir -p $mystatedir statedir=/run/systemd/resolve/netif mkdir -p $statedir local oldstate="$(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" > "$oldstate" 2> /dev/null || true case "$reason" in BOUND|RENEW|REBIND|REBOOT|TIMEOUT|BOUND6|RENEW6|REBIND6) if [ -n "$new_domain_name_servers" ] ; then cat <<EOF >"$mystatedir/isc-dhcp-v4-$interface" DNS="$new_domain_name_servers" EOF if [ -n "$new_domain_name" ] || [ -n "$new_domain_search" ] ; then cat <<EOF >>"$mystatedir/isc-dhcp-v4-$interface" DOMAINS="$new_domain_search $new_domain_name" EOF fi fi if [ -n "$new_dhcp6_name_servers" ] ; then cat <<EOF >"$mystatedir/isc-dhcp-v6-$interface" DNS6="$new_dhcp6_name_servers" EOF if [ -n "$new_dhcp6_domain_search" ] ; then cat <<EOF >>"$mystatedir/isc-dhcp-v6-$interface" DOMAINS6="$new_dhcp6_domain_search" EOF fi fi ;; EXPIRE|FAIL|RELEASE|STOP) rm -f "/run/network/isc-dhcp-v4-$interface" ;; EXPIRE6|RELEASE6|STOP6) rm -f "/run/network/isc-dhcp-v6-$interface" ;; esac local newstate="$(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" "$newstate" 2>/dev/null; then local DNS DNS6 DOMAINS DOMAINS6 DEFAULT_ROUTE # v4 first if [ -e "$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-$interface" fi local resolvectl_failed= if [ "$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
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