测试端口是否打开并使用PHP转发

Question

全面披露:有一个类似的问题在这里.

有什么方法可以测试特定端口是否使用PHP打开并正确转发？具体来说,如何使用套接字连接给定端口的给定用户？

这方面的一个例子是WhatsMyIP.org/ports的"自定义端口测试"部分.

Answer 1

我不确定你被"正确转发"是什么意思,但希望这个例子可以解决这个问题:

$host = 'stackoverflow.com';
$ports = array(21, 25, 80, 81, 110, 443, 3306);

foreach ($ports as $port)
{
    $connection = @fsockopen($host, $port);

    if (is_resource($connection))
    {
        echo '<h2>' . $host . ':' . $port . ' ' . '(' . getservbyport($port, 'tcp') . ') is open.</h2>' . "\n";

        fclose($connection);
    }

    else
    {
        echo '<h2>' . $host . ':' . $port . ' is not responding.</h2>' . "\n";
    }
}

输出:

stackoverflow.com:21 is not responding.
stackoverflow.com:25 is not responding.
stackoverflow.com:80 (http) is open.
stackoverflow.com:81 is not responding.
stackoverflow.com:110 is not responding.
stackoverflow.com:443 is not responding.
stackoverflow.com:3306 is not responding.

有关端口号的完整列表,请参见http://www.iana.org/assignments/port-numbers.