[asuswrt-merlin] Custom dyndns

admin@RTN66U:/tmp/home/root# cat /jffs/scripts/ddns-start
#!/bin/sh

logger -t $(basename $0) "started [$@]"

# Is IP has changed?
if [ "x$(cat /jffs/data/prev_ip.txt)" == "x$1"];
then
    /sbin/ddns_custom_updated 1
    logger -t $(basename $0) "ip is not changed."
    exit 0
fi

# Save new ip
echo $1 > /jffs/data/prev_ip.txt

# Update new IP here

if [ $? -eq 0 ];
then
    /sbin/ddns_custom_updated 1
    logger -t $(basename $0) "update successfull"
else
    /sbin/ddns_custom_updated 0
    logger -t $(basename $0) "update failed"
fi