xref: /plugin/smtp/helper.php (revision ee5c02056e482f4a07fb4b075ec45c4dfd3de0e8) 
1<?php
2
3use dokuwiki\Extension\Plugin;
4
5/**
6 * DokuWiki Plugin smtp (Helper Component)
7 *
8 * @license GPL 2 http://www.gnu.org/licenses/gpl-2.0.html
9 * @author  Andreas Gohr <andi@splitbrain.org>
10 */
11class helper_plugin_smtp extends Plugin
12{
13    /**
14     * Return a string usable as EHLO message
15     *
16     * @param string $ehlo configured EHLO (overrides automatic detection)
17     * @return string
18     */
19    public static function getEHLO($ehlo = '')
20    {
21        if (empty($ehlo)) {
22            $ip = $_SERVER["SERVER_ADDR"] ?? '';
23            if (empty($ip)) {
24                return "localhost.localdomain";
25            }
26
27            // Indicate IPv6 address according to RFC 2821, if applicable.
28            $colonPos = strpos($ip, ':');
29            if ($colonPos !== false) {
30                $ip = 'IPv6:' . $ip;
31            }
32
33            return "[" . $ip . "]";
34        }
35        return $ehlo;
36    }
37}
38