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<?php
namespace Aws\Credentials;
final class CredentialsUtils
{
/**
* Determines whether a given host
* is a loopback address.
*
* @param $host
*
* @return bool
*/
public static function isLoopBackAddress($host): bool
{
if (!filter_var($host, FILTER_VALIDATE_IP)) {
return false;
}
if (filter_var($host, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) {
if ($host === '::1') {
return true;
}
return false;
}
$loopbackStart = ip2long('127.0.0.0');
$loopbackEnd = ip2long('127.255.255.255');
$ipLong = ip2long($host);
return ($ipLong >= $loopbackStart && $ipLong <= $loopbackEnd);
}
}