#!/bin/sh
# freedns_update.sh: Update the public IP on freedns.afraid.org only if it has changed.
## Place this script in the cron's job directory /etc/cron.d and assign the proper permissions
## and owner
## sudo chmod 500 /etc/cron.d/freedns_update.sh
## sudo chown root:root /etc/cron.d/freedns_update.sh
## Add to /etc/crontab to execute on reboot and every 5 minutes
## Edit /etc/crontab and append these two lines:
## @reboot root /etc/cron.d/freedns_update.sh >/dev/null
## */5 * * * * root /etc/cron.d/freedns_update.sh >/dev/null

#Use your own values
DOMAIN=MYRPICAM.mooo.com
HASHKEY=xxxx

UPDATE_URL="http://freedns.afraid.org/dynamic/update.php?${HASHKEY}"

current_ip=$(wget -q --output-document - http://checkip.dyndns.org | grep -o '[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}')
echo $current_ip

registered_ip=$(ping -qn -c 1 $DOMAIN | head -n 1 | grep -o '[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}')
echo $registered_ip

if [ "${current_ip}" != "${registered_ip}" ]; then
   wget -q --read-timeout=0.0 --waitretry=5 --tries=400 --output-document /dev/null $UPDATE_URL
   if [ $? -eq 0 ]; then
     echo "$(date +"%b %_d %T") $(hostname) $0: IP address updated on freedns.afraid.org: new IP '${current_ip}', old IP '${registered_ip}'" >> /var/log/messages
   else
     echo "$(date +"%b %_d %T") $(hostname) $0: ERROR IP address could not be  updated on freedns.afraid.org: current IP '${current_ip}', registered IP '${registered_ip}'" >> /var/log/messages
   fi
else
   echo "not need update"
fi