#!/bin/bash # # Copyright (C) 2024 VyOS maintainers and contributors # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License version 2 or later as # published by the Free Software Foundation. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. # # if [ $# -lt 1 ]; then echo Invalid args logger -s -t on-dhcp-event "Invalid args \"$@\"" exit 1 fi action=$1 hostsd_client="/usr/bin/vyos-hostsd-client" get_subnet_domain_name () { python3 <<EOF from vyos.kea import kea_get_active_config from vyos.utils.dict import dict_search_args config = kea_get_active_config('4') shared_networks = dict_search_args(config, 'arguments', f'Dhcp4', 'shared-networks') found = False if shared_networks: for network in shared_networks: for subnet in network[f'subnet4']: if subnet['id'] == $1: for option in subnet['option-data']: if option['name'] == 'domain-name': print(option['data']) found = True if not found: for option in network['option-data']: if option['name'] == 'domain-name': print(option['data']) EOF } case "$action" in lease4_renew|lease4_recover) exit 0 ;; lease4_release|lease4_expire|lease4_decline) # delete mapping for released/declined address client_ip=$LEASE4_ADDRESS $hostsd_client --delete-hosts --tag "dhcp-server-$client_ip" --apply exit 0 ;; leases4_committed) # process committed leases (added/renewed/recovered) for ((i = 0; i < $LEASES4_SIZE; i++)); do client_ip_var="LEASES4_AT${i}_ADDRESS" client_mac_var="LEASES4_AT${i}_HWADDR" client_name_var="LEASES4_AT${i}_HOSTNAME" client_subnet_id_var="LEASES4_AT${i}_SUBNET_ID" client_ip=${!client_ip_var} client_mac=${!client_mac_var} client_name=${!client_name_var%.} client_subnet_id=${!client_subnet_id_var} if [ -z "$client_name" ]; then logger -s -t on-dhcp-event "Client name was empty, using MAC \"$client_mac\" instead" client_name=$(echo "host-$client_mac" | tr : -) fi client_domain=$(get_subnet_domain_name $client_subnet_id) if [[ -n "$client_domain" ]] && ! [[ $client_name =~ .*$client_domain$ ]]; then client_name="$client_name.$client_domain" fi $hostsd_client --add-hosts "$client_name,$client_ip" --tag "dhcp-server-$client_ip" --apply done exit 0 ;; *) logger -s -t on-dhcp-event "Invalid command \"$1\"" exit 1 ;; esac