cloudflare-synology-update.php

#!/usr/bin/php -d open_basedir=/usr/syno/bin/ddns
<?php

$account = (string)$argv[1];
$pwd = (string)$argv[2];
$hostnames = (string)$argv[3];
$ip = (string)$argv[4];

// settings
$proxied = true; // set to false to disable cloudflare proxy
$ttl = 1;

// debug
$debug = true; // set to true to enable debug output

/* debug */
if ($debug) { echo "account: $account" . PHP_EOL; }
if ($debug) { echo "pwd: $pwd" . PHP_EOL; }
if ($debug) { echo "hostname: $hostname" . PHP_EOL; }
if ($debug) { echo "ip: $ip" . PHP_EOL; }
/* /debug */

// define data and headers
$headers = [
    'X-Auth-Email: ' . $account,
    'X-Auth-Key: ' . $pwd,
    'Content-Type: application/json'
];

/* debug */
if ($debug) { echo "headers: " ; print_r($headers) . PHP_EOL; }
/* /debug */

// only for IPv4 format
if (!filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4)) {
    echo "badparam";
    exit();
}

// split hostnames
$hostnames = explode(',', $hostnames);

// run update script for each name
foreach ($hostnames as $hostname) {

  $hostname = trim($hostname);

  /* debug */
  if ($debug) { echo "hostname: $hostname" . PHP_EOL; }
  /* /debug */

  // check the hostname contains '.'
  if (strpos($hostname, '.') === false) {
      echo "badparam";
      exit();
  }

  // extract domain
  $hostnameParts = explode('.', $hostname);
  $arrayCount = count($hostnameParts);
  if ($arrayCount > 2) {
      $domain = implode('.', array_slice($hostnameParts, $arrayCount-2, 2));
  } else {
      $domain = implode('.', $hostnameParts);
  }

  /* debug */
  if ($debug) { echo "domain: $domain" . PHP_EOL; }
  /* /debug */

  $data = [
      'type' => 'A',
      'name' => $hostname,
      'content' => $ip,
      'ttl' => $ttl,
      'proxied' => $proxied
  ];

  /* debug */
  if ($debug) { echo "data: " ; print_r($data) . PHP_EOL; }
  /* /debug */

  // get zone id
  $ch = curl_init();
  $zoneUrl = "https://api.cloudflare.com/client/v4/zones?name=$domain";
  curl_setopt($ch, CURLOPT_URL, $zoneUrl);
  curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "GET");
  curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  $result = curl_exec($ch);
  if (curl_errno($ch)) {
      echo "no";
      exit('Error: ' . curl_error($ch));
  }
  curl_close ($ch);
  $json = json_decode($result, true);
  $ZoneID = $json['result']['0']['id'];

  /* debug */
  if ($debug) { echo "zone url: $zoneUrl" . PHP_EOL; }
  if ($debug) { echo "zone id: $ZoneID" . PHP_EOL; }
  if ($debug) { echo "zone data: " ; print_r($json) . PHP_EOL; }
  /* /debug */

  // get record id
  $ch = curl_init();
  $recordUrl = "https://api.cloudflare.com/client/v4/zones/$ZoneID/dns_records?name=$hostname";
  curl_setopt($ch, CURLOPT_URL, $recordUrl);
  curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "GET");
  curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
  $result = curl_exec($ch);
  if (curl_errno($ch)) {
      echo "no";    
      exit('Error: ' . curl_error($ch));
  }
  curl_close ($ch);
  $json = json_decode($result, true);
  $DNSID = $json['result']['0']['id'];

  /* debug */
  if ($debug) { echo "record url: $recordUrl" . PHP_EOL; }
  if ($debug) { echo "record id: $DNSID" . PHP_EOL; }
  if ($debug) { echo "record data: " ; print_r($json) . PHP_EOL; }
  /* /debug */

  // check if update is needed
  $old_ip = $json['result']['0']['content'];

  if ($old_ip != $ip) {
      if ($debug) { echo "CloudFlare IP: $old_ip" . PHP_EOL; }
      if ($debug) { echo "Current IP: $ip" . PHP_EOL; }
      $ch = curl_init();
      $updateUrl = "https://api.cloudflare.com/client/v4/zones/$ZoneID/dns_records/$DNSID";
      curl_setopt($ch, CURLOPT_URL, $updateUrl);
      curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "PUT");
      curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($data));
      curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
      curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
      $result = curl_exec($ch);
      if (curl_errno($ch)) {
        echo "no";
        exit('Error: ' . curl_error($ch));
      }
      curl_close ($ch);
      $json = json_decode($result, true);

      /* debug */
      if ($debug) { echo "update url: $updateUrl" . PHP_EOL; }
      if ($debug) { echo "update data: " ; print_r($json) . PHP_EOL; }
      if ($debug) { echo "The IP has changed from $old_ip to $ip!" . PHP_EOL; }
      /* /debug */
  } else {
      if ($debug) { echo "CloudFlare IP: $old_ip" . PHP_EOL; }
      if ($debug) { echo "Current IP: $ip" . PHP_EOL; }
      if ($debug) { echo "The IP doesn't have to be changed!" . PHP_EOL; }
  }
  echo "good";
}