check_ip

#!/bin/bash
while true; do
    if [ -z "$DNS_DOMAIN_NAME" ]
    then
        echo -e "\$DNS_DOMAIN_NAME is empty!\nYou can fix this by running: export DNS_DOMAIN_NAME=<yourDomain.com>"
        exit 0
    fi
    if [ -z "$DNS_PASSWORD" ]
    then
        echo -e "\$DNS_PASSWORD is empty!\nYou can fix this by running: export DNS_PASSWORD=<password>"
        exit 0
    fi
    if [ -z "$DNS_UPDATE_INTERVAL" ]
    then
        echo -e "\$DNS_UPDATE_INTERVAL is empty!\nYou can fix this by running: export DNS_UPDATE_INTERVAL=<minutes>\nDefault interval is 15 minutes."
        export DNS_UPDATE_INTERVAL=15
    fi

    FILE=./last_ip
    IP=$(curl ipinfo.io/ip)

    # Hosts in your domain provider, any subdomain should be also included.
    HOSTS=('www' '*' '@')

    function call_api {
        echo "" > logs #clear logs file
        for host in "${HOSTS[@]}"
        do
            echo -e "Updating IP for host $host ..." 
            echo "- HOST $host:" >> logs
            echo $(curl -s "https://dynamicdns.park-your-domain.com/update?domain=$DNS_DOMAIN_NAME&password=$DNS_PASSWORD&host=$host") |
        xmllint --format - >> logs
        done
    }

    if [ -f "$FILE" ]; then
        echo "reading last_ip..."
        LAST_IP=$( cat $FILE )
        echo "last ip: $LAST_IP"
        echo "current ip: $IP"
        if [ $IP != $LAST_IP ]; then
            echo "The ip is different"
            echo $IP > $FILE
            call_api
        else
            echo "The ip is the same"
        fi
    else 
        echo -e "$FILE does not exist.\nCreating file..."
        echo $IP > $FILE
        call_api
    fi
    echo -e "\nDONE!\nIf you experience any errors:\n1. Check the logs file 'cat ./logs'\n2. Remove last_ip file 'rm ./last_ip'\n3. Restart the process described at:\nhttps://github.com/dcorral3/server_ip_utils"
    sleep $DNS_UPDATE_INTERVAL\m
done