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#!/bin/bash
# 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 [ $# -lt 1 ]; then
echo Invalid args
logger -s -t on-dhcp-event "Invalid args \"$@\""
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
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