/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.
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/**
* 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;
}
}
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