Update DynDNS (OVH)

update-dynhost-ovh.sh

#!/bin/bash

# Don't forget to chmod +x update-dynhost-ovh.sh and add the cron
# */5 * * * * update-dynhost-ovh.sh

DOMAIN=""
USERNAME=""
PASSWORD=""

LOG_FILE="/var/log/update-dyndns-ovh.log"
LOG_TIMESTAMP=$(date +%s)
IP_DNS=$(dig +short $DOMAIN)
IP_LOCAL=$(curl https://api.ipify.org)

UPDATE_RESULT=""
if [[ "$IP_DNS" == "" || "$IP_LOCAL" == "" ]]; then
    UPDATE_RESULT="Got an empty response for IP_DNS and/or IP_LOCAL (IP_DNS: $IP_DNS IP_LOCAL: $IP_LOCAL). Skipping update."
elif [[ "$IP_DNS" != "$IP_LOCAL" ]]; then
    echo "$LOG_TIMESTAMP: Found a different IP. IP_DNS: $IP_DNS IP_LOCAL: $IP_LOCAL. Updating DNS..." >> "$LOG_FILE"
    UPDATE_RESULT=$(curl "https://www.ovh.com/nic/update?system=dyndns&hostname=$DOMAIN&myip=$CURRENT_IP" -u "$USERNAME:$PASSWORD")
else
    UPDATE_RESULT="The DNS is already up to date."
fi

echo "$LOG_TIMESTAMP: UPDATE_RESULT: $UPDATE_RESULT" >> "$LOG_FILE"