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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
unset 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
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