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#!/bin/bash
#
# This script is meant as a hook in /etc/networkd-dispatcher/routable.d
# It receives information on the state of the interface per environment,
# in particular:
# * $IFACE -> network interface that triggered this script
# * $ADDR -> IP address configured on that interface
check_dns() {
local fqdn host_out
for timeout in 1 1 1 2 2 3 5 5 END; do
if [ "$timeout" = "END" ]; then
echo "Falling back to IP address if needed."
fqdn=
break
fi
host_out="$(host $ADDR)"
if [ $? -ne 0 ]; then
echo "Failed to retrieve FQDN through reverse lookup on '$ADDR'."
sleep $timeout
else
local fqdn="$(<<< $host_out grep -E "$(awk -F. '{print $4"."$3"."$2"."$1}' <<< $ADDR )" | awk '{sub(".$",""); print $5}')"
break
fi
done
# check domain
local domain="${fqdn#*.}"
if [ -n "$domain" ] && ! grep -qE "^(search|domain).*$domain.*" /etc/resolv.conf; then
echo "Adding DNS domain '$domain' to systemd-resolved configuration"
mkdir -p /etc/systemd/resolved.conf.d
cat <<- EOF > /etc/systemd/resolved.conf.d/dns-domain.conf
[Resolve]
Domains=$domain
EOF
systemctl restart systemd-resolved
fi
# Check if we received a hostname from the DHCP
local dhcp_hostname
for lease in /run/systemd/netif/leases/*; do
grep -qE "^ADDRESS=$ADDR" "$lease" || continue
dhcp_hostname="$(awk -F= '$1 = /HOSTNAME/ {print $2}' "$lease" )"
break
done
if [ -n "$dhcp_hostname" ]; then
# Prefer DHCP hostname over anything else
if [ "$dhcp_hostname" != "$(hostname)" ]; then
echo "Current hostname differs from DHCP, forcing DHCP hostname: '$dhcp_hostname'"
echo "systemd-networkd should have set it but did not. Check your configuration."
set_hostname "$dhcp_hostname"
fi
return 0
fi
# No DHCP hostname, check DNS hostname
local dns_hostname="${fqdn%%.*}"
if [ -n "$dns_hostname" ]; then
if [ "$dns_hostname" != "$(hostname)" ]; then
echo "Current hostname differs from DNS, forcing DNS hostname: '$dns_hostname'"
set_hostname "$dns_hostname"
fi
else
echo "Neither DHCP nor DNS provided a hostname, use IP address as fallback."
set_hostname "${ADDR//./-}"
fi
return 0
}
set_hostname() {
hostnamectl set-hostname "$1"
}
if [ ! -e /opt/openslx/config ]; then
echo "No OpenSLX configuration found - aborting."
exit 1
fi
. /opt/openslx/config
if [ "$IFACE" != "${SLX_BRIDGE:-$SLX_PXE_NETIF}" ]; then
echo "Ignoring $IFACE."
exit 0
fi
# Wait until the interface is fully configured to make sure DNS lookups will work
# This works around the cases of a routable but configuring state which makes not sense at all...
for timeout in 1 1 1 2 2 3 5 5 END; do
if [ "$timeout" = "END" ]; then
echo "$IFACE did reach routable and configured state within 20sec, giving up..."
exit 1
fi
if networkctl status "$IFACE" | grep -qE "^\s*State:\s*routable\s*\(configured\)"; then
echo "$IFACE routable and configured, going on..."
break
fi
sleep "$timeout"
done
sleep 1
check_dns
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