diff options
Diffstat (limited to 'src/system/on-dhcp-event.sh')
| -rwxr-xr-x | src/system/on-dhcp-event.sh | 105 |
1 files changed, 75 insertions, 30 deletions
diff --git a/src/system/on-dhcp-event.sh b/src/system/on-dhcp-event.sh index 49e53d7e1..47c276270 100755 --- a/src/system/on-dhcp-event.sh +++ b/src/system/on-dhcp-event.sh @@ -1,53 +1,98 @@ #!/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/>. +# +# -# This script came from ubnt.com forum user "bradd" in the following post -# http://community.ubnt.com/t5/EdgeMAX/Automatic-DNS-resolution-of-DHCP-client-names/td-p/651311 -# It has been modified by Ubiquiti to update the /etc/host file -# instead of adding to the CLI. -# Thanks to forum user "itsmarcos" for bug fix & improvements -# Thanks to forum user "ruudboon" for multiple domain fix -# Thanks to forum user "chibby85" for expire patch and static-mapping - -if [ $# -lt 5 ]; then +if [ $# -lt 1 ]; then echo Invalid args logger -s -t on-dhcp-event "Invalid args \"$@\"" exit 1 fi action=$1 -client_name=$2 -client_ip=$3 -client_mac=$4 -domain=$5 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 - commit) # add mapping for new lease - if [ -z "$client_name" ]; then - logger -s -t on-dhcp-event "Client name was empty, using MAC \"$client_mac\" instead" - client_name=$(echo "client-"$client_mac | tr : -) - fi - - if [ "$domain" == "..YYZ!" ]; then - client_fqdn_name=$client_name - client_search_expr=$client_name - else - client_fqdn_name=$client_name.$domain - client_search_expr="$client_name\\.$domain" - fi - $hostsd_client --add-hosts "$client_fqdn_name,$client_ip" --tag "dhcp-server-$client_ip" --apply + lease4_renew|lease4_recover) exit 0 ;; - release) # delete mapping for released address + 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 - -exit 0 |