This file is indexed.

/usr/share/php/Horde/Mail/Autoconfig/Driver/Guess.php is in php-horde-mail-autoconfig 1.0.2-3ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
<?php
/**
 * Copyright 2014-2015 Horde LLC (http://www.horde.org/)
 *
 * See the enclosed file COPYING for license information (LGPL). If you
 * did not receive this file, see http://www.horde.org/licenses/lgpl21.
 *
 * @category  Horde
 * @copyright 2014-2015 Horde LLC
 * @license   http://www.horde.org/licenses/lgpl21 LGPL 2.1
 * @package   Mail_Autoconfig
 */

/**
 * Do simplistic guessing of hosts by appending common server names to domain.
 *
 * @author    Michael Slusarz <slusarz@horde.org>
 * @category  Horde
 * @copyright 2014-2015 Horde LLC
 * @license   http://www.horde.org/licenses/lgpl21 LGPL 2.1
 * @package   Mail_Autoconfig
 */
class Horde_Mail_Autoconfig_Driver_Guess extends Horde_Mail_Autoconfig_Driver
{
    /**
     * DNS resolver.
     *
     * @var Net_DNS2_Resolver
     */
    public $dns;

    /**
     * Low priority: shot-in-the dark technique that has no formalized
     * standard.
     */
    public $priority = 30;

    /**
     */
    public function msaSearch($domains, array $opts = array())
    {
        $out = array();

        foreach ($domains as $val) {
            $tmp = new Horde_Mail_Autoconfig_Server_Msa();
            $tmp->host = $val;
            $out[] = $tmp;
        }

        foreach ($out as $val) {
            $tmp = clone $val;
            $tmp->host = 'smtp.' . $tmp->host;
            $out[] = $tmp;

            $tmp = clone $val;
            $tmp->host = 'mail.' . $tmp->host;
            $out[] = $tmp;
        }

        return $this->_resolveHosts($out);
    }

    /**
     */
    public function mailSearch($domains, array $opts = array())
    {
        $out = array();

        foreach ($domains as $val) {
            $tmp = new Horde_Mail_Autoconfig_Server_Imap();
            $tmp->host = $val;
            $out[] = $tmp;

            $tmp = new Horde_Mail_Autoconfig_Server_Pop3();
            $tmp->host = $val;
            $out[] = $tmp;
        }

        foreach ($out as $val) {
            if (empty($opts['no_imap']) &&
                ($val instanceof Horde_Mail_Autoconfig_Server_Imap)) {
                $tmp = clone $val;
                $tmp->host = 'imap.' . $tmp->host;
                $out[] = $tmp;
            }
            if (empty($opts['no_pop3']) &&
                ($val instanceof Horde_Mail_Autoconfig_Server_Pop3)) {
                $tmp = clone $val;
                $tmp->host = 'pop.' . $tmp->host;
                $out[] = $tmp;

                $tmp = clone $val;
                $tmp->host = 'pop3.' . $tmp->host;
                $out[] = $tmp;
            }

            $tmp = clone $val;
            $tmp->host = 'mail.' . $tmp->host;
            $out[] = $tmp;
        }

        return $this->_resolveHosts($out);
    }

    /**
     * Filter list by removing non-existent hosts.
     *
     * @param array $hosts  List of possible servers (objects).
     *
     * @return mixed  Array of existing hosts, or false if none exist.
     */
    protected function _resolveHosts($hosts)
    {
        $out = array();

        if (is_null($this->dns)) {
            $this->dns = new Net_DNS2_Resolver();
        }

        foreach ($hosts as $val) {
            try {
                $this->dns->query($val->host, 'A');
                $out[] = $val;
            } catch (Net_DNS2_Exception $e) {
                // Not found; ignore.
            }
        }

        return count($out) ? $out : false;
    }

}