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WindowsConfigLoader.php
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WindowsConfigLoader.php
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<?php
namespace Amp\Dns;
use Amp\Promise;
use Amp\WindowsRegistry\KeyNotFoundException;
use Amp\WindowsRegistry\WindowsRegistry;
use function Amp\call;
final class WindowsConfigLoader implements ConfigLoader
{
private $hostLoader;
public function __construct(HostLoader $hostLoader = null)
{
$this->hostLoader = $hostLoader ?? new HostLoader;
}
public function loadConfig(): Promise
{
return call(function () {
$keys = [
"HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\NameServer",
"HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\DhcpNameServer",
];
$reader = new WindowsRegistry;
$nameserver = "";
while ($nameserver === "" && ($key = \array_shift($keys))) {
try {
$nameserver = yield $reader->read($key);
} catch (KeyNotFoundException $e) {
// retry other possible locations
}
}
if ($nameserver === "") {
$interfaces = "HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters\\Interfaces";
$subKeys = yield $reader->listKeys($interfaces);
foreach ($subKeys as $key) {
foreach (["NameServer", "DhcpNameServer"] as $property) {
try {
$nameserver = yield $reader->read("{$key}\\{$property}");
if ($nameserver !== "") {
break 2;
}
} catch (KeyNotFoundException $e) {
// retry other possible locations
}
}
}
}
if ($nameserver === "") {
throw new ConfigException("Could not find a nameserver in the Windows Registry");
}
$nameservers = [];
// Microsoft documents space as delimiter, AppVeyor uses comma, we just accept both
foreach (\explode(" ", \strtr($nameserver, ",", " ")) as $nameserver) {
$nameserver = \trim($nameserver);
$ip = @\inet_pton($nameserver);
if ($ip === false) {
continue;
}
if (isset($ip[15])) { // IPv6
$nameservers[] = "[" . $nameserver . "]:53";
} else { // IPv4
$nameservers[] = $nameserver . ":53";
}
}
$hosts = yield $this->hostLoader->loadHosts();
return new Config($nameservers, $hosts);
});
}
}