update ddns of ddo.jp

ddns_nu11p0-6477_update.sh

#!/bin/sh

CURRENT_IP_FILE=/opt/nu11p0_6477/ddns/CRT_IP.dat
# seconds
#  7 days = 604800 seconds
FORCE_UPDATE=604800
# set your username and password
USER="user"
PASSWORD="password"

get_global_ip_with_ieserver_net() {
	wget -q -O - ipcheck.ieserver.net
}
get_global_ip_with_mycurse_net() {
	wget -q -O - ipcheck.mycurse.net
}
get_global_ip_with_ddo_jp() {
	wget -q -O - http://info.ddo.jp/remote_addr.php | awk -F':' '/^REMOTE_ADDR:/{print $2}'
}

get_global_ip() {
	get_global_ip_with_ieserver_net
}

# seconds
#  7 days = 604800 seconds
LOG=/var/log/ddns.log
CURRENT_TIME="`date +%s`"
NEW_IP="`get_global_ip`"


update() {
	# for ddo.jp
	wget -q -O - "http://free.ddo.jp/dnsupdate.php?dn=${USER}&pw=${PASSWORD}" >/dev/null
	echo "${CURRENT_TIME} ${NEW_IP}" > $CURRENT_IP_FILE
}

main() {
	CURRENT_IP_DATA="`cat $CURRENT_IP_FILE`"
	LAST_CHANGED="`echo ${CURRENT_IP_DATA} | awk '{print $1}'`"
	CURRENT_IP="`echo ${CURRENT_IP_DATA} | awk '{print $2}'`"
	if [ $(( $LAST_CHANGED + $FORCE_UPDATE )) -lt $CURRENT_TIME ] ; then
		update
		echo "Updated. ($FORCE_UPDATE seconds has past.)" >> $LOG
	elif [ "$NEW_IP" != "$CURRENT_IP" ] ; then
		update
		echo "Updated. (IP address changed: ${CURRENT_IP} -> ${NEW_IP})" >> $LOG
	fi
}

main