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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 [ $# -lt 5 ]; then
echo Invalid args
logger -s -t on-dhcp-event "Invalid args \"$@\""
exit 1
fi
action=$1
client_name=$2
client_ip=$3
client_mac=$4
domain=$5
file=/etc/hosts
changes=0
case "$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
grep -q " $client_search_expr " $file
if [ $? == 0 ]; then
echo host $client_fqdn_name already exists, exiting
exit 1
fi
# add host
/usr/bin/vyos-hostsd-client --add-hosts --tag "DHCP-$client_ip" --host "$client_fqdn_name,$client_ip"
((changes++))
;;
release) # delete mapping for released address
# delete host
/usr/bin/vyos-hostsd-client --delete-hosts --tag "DHCP-$client_ip"
((changes++))
;;
*)
logger -s -t on-dhcp-event "Invalid command \"$1\""
exit 1;
;;
esac
if [ $changes -gt 0 ]; then
echo Success
pid=`pgrep pdns`
if [ -n "$pid" ]; then
sudo rec_control reload-zones
fi
else
echo No changes made
fi
exit 0
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