Current File : //etc/dhcp/dhclient-exit-hooks.d/resolved
#!/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
chown systemd-resolve:systemd-resolve $statedir
local oldstate="$(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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