no-ip.org no-ip.com automatic updater for bash/linux with host parameter and examples

gistfile1.sh

#!/bin/bash

# original: https://github.com/AntonioCS/no-ip.com-bash-updater/blob/master/noipupdater.sh
# this file: https://gist.github.com/rolfvreijdenberger/af6b2a7527263b8c8200
# more info on no-ip.com api: http://www.noip.com/integrate/request

# usage:
# 1. put it somewhere in your filesystem
# 2. make the file executable
# 3. adjust the parameters provided below:
#       - USERNAME (replace the '@' by '%40'
#       - PASSWORD
#       - HOST (the default part)
#       - LOGFILE
#       - STOREDIPFILE
# 4. create the log file if necessary
# 5. call it from a cron (see step 7) , optionally providing the hostname as the first (and only) parameter. This means that multiple entries in the crontab can be used for multiple domains.
# 6. set the right permissions on all files (log, script etc)
# 7. usage in crontab (crontab -e). adjust as necessary with the correct parameters
#       0  8,18 * * * /path-to/no-ip.sh 'example.no-ip.org'  >> /var/log/no-ip.log 2>&1


# No-IP uses emails as passwords, so make sure that you encode the @ as %40
USERNAME='email%40example.com'
# your password
PASSWORD='password here'
# get either the first command line argument or the default
HOST=${1:-'default.no-ip.org'}
LOGFILE=/var/log/no-ip.log
# append hostname to ip cache file in a directory
STOREDIPFILE=configdir/current_ip_$HOST
USERAGENT="linx bash no-ip updater(https://gist.github.com/rolfvreijdenberger/af6b2a7527263b8c8200)/v1.0 rolf@vreijdenberger.nl"

if [ ! -e $STOREDIPFILE ]; then
        touch $STOREDIPFILE
fi

NEWIP=$(wget -O - http://icanhazip.com/ -o /dev/null)
STOREDIP=$(cat $STOREDIPFILE)

if [ "$NEWIP" != "$STOREDIP" ]; then
        RESULT=$(wget -O "$LOGFILE" -q --user-agent="$USERAGENT" --no-check-certificate "https://$USERNAME:$PASSWORD@dynupdate.no-ip.com/nic/update?hostname=$HOST&myip=$NEWIP")

        LOGLINE="[$(date +"%Y-%m-%d %H:%M:%S")] new ip for $HOST. $RESULT"
        echo $NEWIP > $STOREDIPFILE
else
        LOGLINE="[$(date +"%Y-%m-%d %H:%M:%S")] No IP change for $HOST"
fi

echo $LOGLINE >> $LOGFILE

exit 0