#!/bin/bash
#set -e
#set -x

#	not added (yet):
#		Skip any leases that also are a static host

#	need DOMAINNAME value
eval $(/usr/local/bin/readhash /var/ipfire/main/settings)

dhcpCREstatus=$1
clientIP=$2
clientName=$3

dhcpLeasesFile="/etc/unbound/dhcp-leases2.conf"
touch "${dhcpLeasesFile}"

#	change to lower case (if needed)
#clientName=$( echo "${clientName}" | tr '[:upper:]' '[:lower:]' )

#	create reverse IP
reverseIP=$( echo ${clientIP} | awk -F. '{print $4"."$3"." $2"."$1}' )

#	create "A" record and "PTR" record for unbound
aRecord="local-data: \"${clientName}.${DOMAINNAME} 60 IN A ${clientIP}"\"
ptrRecord="local-data: \"${reverseIP}.in-addr.arpa 60 IN PTR ${clientName}.${DOMAINNAME}"\"

aRecordCount=$( /bin/grep --fixed-strings --count "${aRecord}" "${dhcpLeasesFile}" )
ptrRecordCount=$( /bin/grep --fixed-strings --count "${ptrRecord}" "${dhcpLeasesFile}" )
clientIPcount=$( /bin/grep --count "\s${clientIP}\b" "${dhcpLeasesFile}" )
clientNameCount=$( /bin/grep --fixed-strings --count "${clientName}.${DOMAINNAME}" "${dhcpLeasesFile}" )
#	clientNameCount can be deleted.  currently used for debug

/usr/bin/logger --tag dhcpS \
	"aRecordCount=${aRecordCount}, ptrRecordCount=${ptrRecordCount}, clientIPcount=${clientIPcount}, clientNameCount=${clientNameCount}"

case "${dhcpCREstatus}" in
	commit)  
		#	does A record and PTR record already exist?
		if (( $aRecordCount == 0 )) && (( $ptrRecordCount == 0 )) ; then
			echo "${aRecord}" >> "${dhcpLeasesFile}"
			echo "${ptrRecord}" >> "${dhcpLeasesFile}"
			/usr/bin/logger --tag dhcpC "Record A and PTR added to unbound"
		fi
		;;

	release)
		/usr/bin/logger --tag dhcpR "case = release"

		#	delete lines based on IP address (and not names)
		if (( $clientIPcount > 0 )) ; then
			/usr/bin/logger --tag dhcpE "IP address exists"
			/bin/sed --in-place -e "/\s${clientIP}\b/d" -e "/${reverseIP}/d" "${dhcpLeasesFile}"
			clientIPcount=$( /bin/grep --count "\s${clientIP}\b" "${dhcpLeasesFile}" )
			/usr/bin/logger --tag dhcpE "IP & reverse IP address removed (${clientIPcount})"
		fi
		;;

	expiry)
		/usr/bin/logger --tag dhcpE "case = expiry"
		#	this section is the same as "release" since I don't understand the differences

		#	delete lines based on IP address (and not names)
		if (( $clientIPcount > 0 )) ; then
			/usr/bin/logger --tag dhcpE "IP address exists"
			/bin/sed --in-place -e "/\s${clientIP}\b/d" -e "/${reverseIP}/d" "${dhcpLeasesFile}"
			clientIPcount=$( /bin/grep --count "\s${clientIP}\b" "${dhcpLeasesFile}" )
			clientNameCount=$( /bin/grep --fixed-strings --count "${clientName}.${DOMAINNAME}" "${dhcpLeasesFile}" )
			/usr/bin/logger --tag dhcpE "IP & reverse IP address removed (A=${clientIPcount} PTR=${clientNameCount})"
		fi
		;;
	*)
		/usr/bin/logger --tag dhcp "dhcpEvent script: case = no status"
		exit
		;;
esac

exit