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alex-phillips/cloudflare-ddns-updater.sh

Created November 19, 2024 20:34
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  1. alex-phillips created this gist Nov 19, 2024.
    74 changes: 74 additions & 0 deletions cloudflare-ddns-updater.sh
    View file
    Original file line number Diff line number Diff line change
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    #!/bin/bash

    # Dynamic DNS for CF!
    # Perfect for updating a single sub domain

    # Get a record name from the command line e.g: Update.sh taco ; This will update taco.domain.com
    name=$1
    if [ -z "$name" ]
    then
    echo "[$(date)] - Record Name Missing, e.g: Update.sh taco ; This will update taco.domain.com"
    exit
    fi

    # CloudFlare Account
    auth_email=""
    auth_key=""
    zone_name=""

    # Quick check to ensure you have updated the config above.
    if [ $auth_key = "AUTHKEY" ]
    then
    echo "[$(date)] - Oops! Please fill in the CloudFlare Account Details"
    exit
    fi

    # Get IP Address
    # If Amazon ever retire this service checkout https://ipinfo.io/ip or https://icanhazip.com
    ip=$(curl -s https://checkip.amazonaws.com)

    if [ -z "$ip" ]
    then
    echo "[$(date)] - Oops! We can't find an external IP address"
    exit
    fi

    # Match the Name to our Zone
    record_name="$name.$zone_name"

    echo "[$(date)] - Checking $record_name"

    # Get Zone ID
    zone_identifier=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones?name=$zone_name" -H "X-Auth-Email: $auth_email" -H "X-Auth-Key: $auth_key" -H "Content-Type: application/json" | grep -Po '(?<="id":")[^"]*' | head -1 )

    # Check for Record Entry
    record_exists=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones/$zone_identifier/dns_records?name=$record_name" -H "X-Auth-Email: $auth_email" -H "X-Auth-Key: $auth_key" -H "Content-Type: application/json" | grep -Po '(?<="id":")[^"]*')

    if [ -z "$record_exists" ]
    then
    echo "[$(date)] - No Entry for Record: $record_name"
    exit
    fi

    # Get Record ID
    record_identifier=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones/$zone_identifier/dns_records?name=$record_name" -H "X-Auth-Email: $auth_email" -H "X-Auth-Key: $auth_key" -H "Content-Type: application/json" | grep -Po '(?<="id":")[^"]*')

    # Get Assigned IP
    record_ip=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones/$zone_identifier/dns_records?name=$record_name" -H "X-Auth-Email: $auth_email" -H "X-Auth-Key: $auth_key" -H "Content-Type: application/json" | grep -Po '(?<="content":")[^"]*')

    if [ "$ip" = "$record_ip" ]
    then
    echo "[$(date)] - No Update Required: $record_name is $record_ip"
    exit
    else
    echo "[$(date)] - Update Required: $record_name points to $record_ip"
    fi

    # Update Record
    echo "[$(date)] - Updating $record_name to $ip"

    update=$(curl -s -X PUT "https://api.cloudflare.com/client/v4/zones/$zone_identifier/dns_records/$record_identifier" -H "X-Auth-Email: $auth_email" -H "X-Auth-Key: $auth_key" -H "Content-Type: application/json" --data "{\"id\":\"$zone_identifier\",\"type\":\"A\",\"name\":\"$record_name\",\"content\":\"$ip\",\"proxied\":false}")

    echo "[$(date)] - All Done!"

    exit