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0.9.7.1: add generic Nextcloud transport resolver

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Terranom674
2026-08-19 20:35:40 +02:00
parent ad39b9f0d2
commit aa803a4149
1 changed files with 96 additions and 0 deletions
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96
include/nc_transport.inc.php Normal file
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<?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);
}
}