azure-ddns/azure-ddns.sh at main · Gumbees/azure-ddns · GitHub

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#!/bin/bash
# Script to update a record in Azure DNS to match the current public IP address


# Tenant ID
tenantId="YOUR TENANT ID"
# Azure AD App ID
appId="YOUR APP ID"
# Azure AD App Secret
appSecret="YOUR APP SECRET"
# Azure resource group name where your DNS zone is configured
rgName="YOUR RESOURCE group"
# DNS zone name
zoneName="YOUR DNS ZONE TO UPDATE"
# Existing A record-set name in your DNS zone
recordsetName="YOUR RECORD TO UPDATE"
# Prefix that will be searched to verify whether you are on the right network
# Enable IPv6
enableIpv6=true

# FQDN
fqdn=$recordsetName.$zoneName

# Verify 'dig' is there
digPath=$(which dig)
if [[ -z $digPath ]]
then
    echo "dig does not seem to be installed, but it is required for this script"
    exit 1
fi

# Get public IPv4 from akamai
myPublicIpv4=$(curl http://whatismyip.akamai.com/)
echo "The current IPv4 IP is $myPublicIpv4"

# Get existing public IPv4 from DNS
myDnsIpv4=$(dig +short @8.8.8.8 $fqdn A)

if [ $myPublicIpv4 == $myDnsIpv4 ]
then
    echo "DNS IPv4 up to date, nothing to be done"
else
    echo "Current public IPv4 address $myPublicIpv4 different from DNS IPv4 address $myDnsIpv4, proceeding to update DNS"
    # Login to Azure
    az login --service-principal --tenant $tenantId --username $appId --password=$appSecret >/dev/null 2>&1
    # Configure default resource group to rgName
    az configure --defaults group=$rgName >/dev/null 2>&1
    # Remove old record from record-set
    az network dns record-set a remove-record -n $recordsetName -z $zoneName --ipv4-address $myDnsIpv4 >/dev/null 2>&1
    # Add new record to the record-set
    az network dns record-set a add-record -n $recordsetName -z $zoneName --ipv4-address $myPublicIpv4 --ttl 60 >/dev/null 2>&1
    sleep 120
    newDnsIpv4=$(dig +short @8.8.8.8 $fqdn A)
    if [ $myPublicIpv4 == $newDnsIpv4 ]
    then
        echo "DNS A record correctly updated and verified"
    else
        echo "DNS A record updated, the verification was not successful yet, verify with the commnad 'nslookup $fqdn' in a few minutes/hours"
    fi
    # Bye!
    az logout
fi

if [ $enableIpv6 == true ]
then
    # Get public IPv6 from akamai
    myPublicIpv6=$(curl http://ipv6.whatismyip.akamai.com/)
    echo "The current IPv6 IP is $myPublicIpv6"

    # Get existing IPv6 from DNS
    myDnsIpv6=$(dig +short @8.8.8.8 $fqdn AAAA)

    if [ $myPublicIpv6 == $myDnsIpv6 ]
    then
        echo "DNS IPv6 up to date, nothing to be done"

    else
        echo "Current public IPv6 address $myPublicIpv6 is different from DNS IPv6 address $myDnsIpv6. Updating DNS"
        # Login to Azure
        az login --service-principal --tenant $tenantId --username $appId --password=$appSecret >/dev/null 2>&1
        # Configure default resource group to rgName
        az configure --defaults group=$rgName >/dev/null 2>&1
        # Remove old record from record-set
        az network dns record-set aaaa remove-record -n $recordsetName -z $zoneName --ipv6-address $myDnsIpv6 >/dev/null 2>&1
        # Add new record to the record-set
        az network dns record-set aaaa add-record -n $recordsetName -z $zoneName --ipv6-address $myPublicIpv6 --ttl 60 >/dev/null 2>&1
        sleep 120
        newDnsIpv6=$(dig +short @8.8.8.8 $fqdn AAAA)
        if [ $myPublicIpv6 == $newDnsIpv6 ]
        then
            echo "DNS AAAA correctly updated and verified"

        else
            echo "DNS AAAA updated, the verification was not successful yet, verify with the commnad 'nslookup $fqdn' in a few minutes/hours"

        fi

        # Bye!
        az logout
    fi
fi