From aa803a414938e6d10f861c2392251d29e9797c8f Mon Sep 17 00:00:00 2001
From: Terranom674 <thomas_dannenberg@web.de>
Date: Wed, 19 Aug 2026 20:35:40 +0200
Subject: [PATCH] 0.9.7.1: add generic Nextcloud transport resolver

---
 include/nc_transport.inc.php | 96 ++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 include/nc_transport.inc.php

diff --git a/include/nc_transport.inc.php b/include/nc_transport.inc.php
new file mode 100644
index 0000000..b9eba6a
--- /dev/null
+++ b/include/nc_transport.inc.php
@@ -0,0 +1,96 @@
+<?php
+
+function bratonien_tools_nc_transport_host($url)
+{
+  $host = trim((string)parse_url((string)$url, PHP_URL_HOST));
+  if ($host === '') throw new RuntimeException('Die Nextcloud-Adresse enthält keinen gültigen Hostnamen oder keine IP-Adresse.');
+  return trim($host, '[]');
+}
+
+function bratonien_tools_nc_transport_scheme($url)
+{
+  $scheme = strtolower(trim((string)parse_url((string)$url, PHP_URL_SCHEME)));
+  if (!in_array($scheme, array('http','https'), true)) throw new RuntimeException('Nextcloud muss per HTTP oder HTTPS angesprochen werden.');
+  return $scheme;
+}
+
+function bratonien_tools_nc_transport_is_ip($host)
+{
+  return filter_var(trim((string)$host, '[]'), FILTER_VALIDATE_IP) !== false;
+}
+
+function bratonien_tools_nc_transport_public_ip($host)
+{
+  static $cache = array();
+
+  $host = strtolower(trim((string)$host, '[]'));
+  if ($host === '') throw new RuntimeException('Für die Nextcloud-Verbindung fehlt der Hostname.');
+  if (bratonien_tools_nc_transport_is_ip($host)) return $host;
+  if (isset($cache[$host])) return $cache[$host];
+  if (!function_exists('curl_init')) throw new RuntimeException('Der öffentliche DNS-Abgleich benötigt PHP-cURL.');
+
+  $providers = array(
+    array('host'=>'dns.google', 'ips'=>array('8.8.8.8','8.8.4.4'), 'url'=>'https://dns.google/resolve?name='.rawurlencode($host).'&type=A'),
+    array('host'=>'cloudflare-dns.com', 'ips'=>array('1.1.1.1','1.0.0.1'), 'url'=>'https://cloudflare-dns.com/dns-query?name='.rawurlencode($host).'&type=A'),
+  );
+
+  foreach ($providers as $provider)
+  {
+    foreach ($provider['ips'] as $resolver_ip)
+    {
+      $ch = curl_init($provider['url']);
+      $options = array(
+        CURLOPT_RETURNTRANSFER=>true,
+        CURLOPT_FOLLOWLOCATION=>false,
+        CURLOPT_CONNECTTIMEOUT=>5,
+        CURLOPT_TIMEOUT=>10,
+        CURLOPT_HTTPHEADER=>array('Accept: application/dns-json'),
+        CURLOPT_USERAGENT=>'Bratonien-Tools-DNS/0.9.7.1',
+      );
+      if (defined('CURLOPT_RESOLVE'))
+      {
+        $options[CURLOPT_RESOLVE] = array($provider['host'].':443:'.$resolver_ip);
+      }
+      curl_setopt_array($ch, $options);
+      $body = curl_exec($ch);
+      $errno = curl_errno($ch);
+      $status = (int)curl_getinfo($ch, CURLINFO_HTTP_CODE);
+      curl_close($ch);
+      if ($body === false || $errno !== 0 || $status < 200 || $status >= 300) continue;
+
+      $decoded = json_decode((string)$body, true);
+      if (!is_array($decoded) || !isset($decoded['Answer']) || !is_array($decoded['Answer'])) continue;
+      foreach ($decoded['Answer'] as $answer)
+      {
+        if ((int)($answer['type'] ?? 0) !== 1) continue;
+        $ip = trim((string)($answer['data'] ?? ''));
+        if (filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4 | FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE) === false) continue;
+        return $cache[$host] = $ip;
+      }
+    }
+  }
+
+  throw new RuntimeException('Für '.$host.' konnte keine öffentliche IPv4-Adresse ermittelt werden.');
+}
+
+function bratonien_tools_nc_transport_resolve_entry($url)
+{
+  $scheme = bratonien_tools_nc_transport_scheme($url);
+  $host = bratonien_tools_nc_transport_host($url);
+  if (bratonien_tools_nc_transport_is_ip($host)) return null;
+
+  $port = (int)parse_url((string)$url, PHP_URL_PORT);
+  if ($port < 1) $port = $scheme === 'https' ? 443 : 80;
+  $ip = bratonien_tools_nc_transport_public_ip($host);
+  return $host.':'.$port.':'.$ip;
+}
+
+function bratonien_tools_nc_transport_apply_curl(array &$options, $url)
+{
+  $entry = bratonien_tools_nc_transport_resolve_entry($url);
+  if ($entry !== null)
+  {
+    if (!defined('CURLOPT_RESOLVE')) throw new RuntimeException('Diese cURL-Version unterstützt keine direkte Host-zu-IP-Zuordnung.');
+    $options[CURLOPT_RESOLVE] = array($entry);
+  }
+}