Script to update in ovh the ip address of dynamic DNS and send the IP using Telegram Bot when update the ip.

ddns-update.sh

#
# CONFIG
#

#FQDN
HOST="example.com"

# Telegram
BOT_API_KEY=""
BOT_CHAT_ID=""
BOT_VIM_NAME=""

#Login and password
LOGIN=""
PASSWORD=""
 
PATH_LOG=/var/log/dynhost
CURRENT_DATE=`date`
 
#
# GET IPs
#
 
HOST_IP=$(dig +short a $HOST)
CURRENT_IP=$(dig +short myip.opendns.com @resolver1.opendns.com)
 
#
# DO THE WORK
#
if [ -z $CURRENT_IP ] || [ -z $HOST_IP ]
then
        echo "No IP retrieved" >> $PATH_LOG
else
        if [ "$HOST_IP" != "$CURRENT_IP" ]
        then
                echo "$CURRENT_DATE"": Current IP:" "$CURRENT_IP" "and" "host IP:" "$HOST_IP" "   IP has changed!" >> $PATH_LOG
                RES=`curl --user "$LOGIN:$PASSWORD" "https://www.ovh.com/nic/update?system=dyndns&hostname=$HOST&myip=$CURRENT_IP"`
                echo "Result request dynHost:" >> $PATH_LOG
                echo "$RES" >> $PATH_LOG
                message="$CURRENT_DATE Current IP: $CURRENT_IP and host IP: $HOST_IP -- ${HOST} has changed!"
                message=$(echo $message | sed -e 's/ /%20/g')
                curl "https://api.telegram.org/bot${BOT_API_KEY}/sendMessage" --data-urlencode "chat_id=${BOT_CHAT_ID}" --data-urlencode "text=$message"
        else
                echo "$CURRENT_DATE"": Current IP:" "$CURRENT_IP" "and" "Host IP:" "$HOST_IP" "   IP has not changed" >> $PATH_LOG
        fi
fi