Update IP Dynamic DNS dhs.org

dhs-update.sh

#!/bin/bash
RETVAL=0

USER=username
PASSWORD=password
HOSTNAME=hostname
DOMAIN=dyn.dhs.org

CHECKIPURL=http://checkip.dyndns.org:8245/
WANIPNEWCACHE=/var/tmp/wanip-cache-new
WANIPOLDCACHE=/var/tmp/wanip-cache-old

#DEBUG 1:Enable 0:Disable
DEBUG=0

WANIP=$(curl -s -L "${CHECKIPURL}" | grep "Current IP Address:" | grep -o -E "[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}")
if [ -z "${WANIP}" ]; then
  echo "Cannot get WANIP"
  exit 1
fi

echo $WANIP >${WANIPNEWCACHE}
if [ -f "${WANIPOLDCACHE}" ]; then
  OLDIP=$(head -n1 "${WANIPOLDCACHE}")
else
  echo "This is First running."
fi
if [ "${OLDIP}" = "${WANIP}" ]; then
  [ "${DEBUG}" = "1" ] && echo "no change ip:${WANIP}"
  [ "${DEBUG}" = "1" ] && echo "do not update ddns:${HOSTNAME}.${DOMAIN}"
  exit 0
fi

curl -k -X POST "https://${USER}:${PASSWORD}@members.dhs.org/nic/hosts" -d "domain=${DOMAIN}&hostname=${HOSTNAME}&hostscmd=edit&hostscmdstage=2&type=4&updatetype=Online&ip=${WANIP}&submit=Update"
if [ "$?" -ne "0" ]; then
  RETVAL=1
else
  echo "change ip:${WANIP}"
  echo "updated ddns:${HOSTNAME}.${DOMAIN}"
fi

cp -f "${WANIPNEWCACHE}" "${WANIPOLDCACHE}"

exit $RETVAL