使用 PHP 测试端口是否打开并转发
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Test if port open and forwarded using PHP
提问by Charlie Salts
Full Disclosure: There's a similar question here.
全面披露：有一个类似的问题在这里。
Is there any way I can test if a particular port is open and forwarded properly using PHP? Specifically, how do I go about using a socket to connect to a given user with a given port?
有什么方法可以测试特定端口是否打开并使用 PHP 正确转发？具体来说，我如何使用套接字连接到具有给定端口的给定用户？
An Example of this is in the 'Custom Port Test' section of WhatsMyIP.org/ports.
这方面的一个示例位于WhatsMyIP.org/ports的“自定义端口测试”部分。
回答by Alix Axel
I'm not sure what you mean by being "forwarded properly", but hopefully this example will do the trick:
我不确定你所说的“正确转发”是什么意思，但希望这个例子能解决问题：
$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";
}
}
Output:
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.
See http://www.iana.org/assignments/port-numbersfor a complete list of port numbers.
有关端口号的完整列表，请参阅http://www.iana.org/assignments/port-numbers。
