ddns-scripts: update hotplug script

To handle ip address changing by ifupdate.
When the ipv6 address is updated for an interface
(some ISP only give dynamic ipv6 address).
The ddns script will go into dead loop,
as the new ipv6 address is not used.
The simple change is restarting ddns when ip address is changed.

Signed-off-by: Jimmy Qin <sunnyqeen@gmail.com>
(cherry picked from commit 889e134007)

net/ddns-scripts/Makefile

@@ -8,7 +8,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=ddns-scripts
 PKG_VERSION:=2.8.4
-PKG_RELEASE:=3
+PKG_RELEASE:=4
 
 PKG_LICENSE:=GPL-2.0
 

net/ddns-scripts/files/etc/hotplug.d/iface/ddns

@@ -38,4 +38,10 @@ case "$ACTION" in
 	ifdown)
 		ddns_service "ifdown" "$INTERFACE"
 		;;
+	ifupdate)
+		[ -z "$IFUPDATE_ADDRESSES" ] && exit 0
+		ddns_service "ifdown" "$INTERFACE"
+		sleep 1	# give time to shutdown
+		/etc/init.d/ddns enabled && ddns_service "ifup" "$INTERFACE"
+		;;
 esac