Fritz!Box DynDNS update script for Cloudflare

upd.php

<?php
  
  // This solution contains two options for reading the records for updating:
  // 1) file-mode: reading all records from external file
  // 2) parameter-mode: reading all records from url parameter 'hosts'
  // It is possible to use both option simultaneous.

  // Fritz!Box update URL using hosts from external file: https://example.com/upd.php?zoneId={zoneId}&key=<pass>&file={filename}&ip=<ipaddr>
  // If you want to read your records from a file, specify the file name as parameter.
  // Therefore the file should be in the same directory as this php file.
  // The file should contain on each line one record, eg:
  //   abc.example.com
  //   def.example.com

  // Fritz!Box update URL using hosts from parameter: https://example.com/upd.php?zoneId={zoneId}&key=<pass>&hosts=<domain>&ip=<ipaddr>
  // If you want to update multiple records of your zone using the hosts parameter, just add them comma separated to the domain field
  // e.g. "example.com,sub.example.com,sub2.example.com,*.example.com"

  // The zoneId field should matches your zone id form cloudflare and the key filed your cloudflare api token.
  // This token should have the permission 'DNS:Edit' set.
  
  $ip = $_GET['ip'];
  $zone_id = $_GET['zoneId'];
  $key = $_GET['key'];
  $hosts = array();

  $api_base = 'https://api.cloudflare.com/client/v4/zones';

  if ($zone_id == NULL || $key == NULL)
  {
    echo "Please check your provided zoneId and authentication token.<br/>";
    return;
  }

  if (isset($_GET['hosts']) && $_GET['hosts'] != Null)
    $hosts = explode(',', $_GET['hosts']);

  if (isset($_GET['file']) && $_GET['file'] != NULL) {
    $file_lines = file($_GET['file']);
    foreach ($file_lines as $line) 
    {
      if(trim($line) !== '')
        array_push($hosts, $line);
    }
  }

  // get record identifier
  $ch = curl_init();
  curl_setopt($ch, CURLOPT_URL, $api_base . '/' . $zone_id . '/dns_records?type=A');
  curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
  curl_setopt($ch, CURLOPT_FOLLOWLOCATION, FALSE);
  curl_setopt($ch, CURLOPT_HTTPHEADER, array('Authorization: Bearer ' . $key, 'Content-Type: application/json'));
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);

  $response = json_decode(curl_exec($ch));
  curl_close($ch);

  if($response -> success == FALSE)
  {
    foreach ($response -> errors as $value)
    {
      echo 'Error fetching record identifier:<br/>';
      echo $value -> message;
      echo '<br/>';
    }
    return;
  }

  $records = array();
  foreach ($response -> result as $value)
  {
    if(in_array($value -> name, $hosts))
    {
      array_push($records, $value);
    }
  }
  
  // update record(s)
  $mh = curl_multi_init();
  $ch_arr = array();
  $results = array();

  foreach ( $records as $rec)
  {
    $record_name = $rec -> name;
    $record_id = $rec -> id;
    $put_data = array('type' => 'A', 'name' => $record_name, 'content' => $ip, 'ttl' => 120, 'proxied' => FALSE ); 
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $api_base . '/' . $zone_id . '/dns_records/' . $record_id);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, FALSE);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "PUT");
    curl_setopt($ch, CURLOPT_HTTPHEADER, array('Authorization: Bearer ' . $key, 'Content-Type: application/json'));
    curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($put_data));
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);

    array_push($ch_arr, $ch);
    curl_multi_add_handle($mh, $ch);
  }

  $running = null;

  do
  {
    curl_multi_exec($mh, $running);
  }
  while($running > 0);

  foreach ($ch_arr as $ch)
  {
    array_push($results, json_decode(curl_multi_getcontent($ch)));
    curl_multi_remove_handle($mh, $ch);
  }

  curl_multi_close($mh);
  foreach ($results as $result)
  {
    if($result -> success == FALSE)
    {
      foreach ($result -> errors as $index => $value)
      {
        echo 'Error updating domain ' . $hosts[$index] . ':<br/>';
        echo $value -> message;
        echo '<br/>';
      }
      return;
    }
  }

  echo 'SUCCESS';
?>