Question

I need a little help with the fsockopen function.

I have this PHP code:

if (in_array($_SERVER['REMOTE_PORT'], array(8080,80,6588,8000,3128,553,554,47830,50070))
    || @fsockopen($_SERVER['REMOTE_ADDR'], 80, $errno, $errstr, 1))

I need to make fsockopen check IPs by port 80 if it doesn’t request authentication.

I think I should use isset($_SERVER['PHP_AUTH_USER']) in there somewhere, but I can’t do it by myself. Can anyone help?

Update………………………

@drew010 Thank you very much

My Best Regards

Answer 1

To see if the remote server requests authentication, you need to make a request and read the response.

If the response is 401 Authorization Required, then it is requesting auth, otherwise it is not.

if (in_array($_SERVER['REMOTE_PORT'], array(8080,80,6588,8000,3128,553,554,47830,50070)) {
    $fp = @fsockopen($_SERVER['REMOTE_ADDR'], 80, $errno, $errstr, 1);

    if ($fp) {
        $url = "/";

        fputs($fp, "GET $url HTTP/1.1\r\nHost: {$_SERVER['REMOTE_ADDR']}\r\nConnection: close\r\n\r\n");
        $resp = '';

        while(!feof($fp)) {
            $resp .= fgets($fp, 1024);
        }

        if (preg_match('/^http\/1\.\d+ 401/i', $resp)) {
            echo "Requires authentication";
        } else {
            echo "No auth required.";
        }
    } else {
        echo "Failed to connect on port 80, reason: $errstr";
    }
}