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Edit File : smtpmx.php \| Size : 14.82 KB
<?php /* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: / /* * SMTP MX * * SMTP MX implementation of the PEAR Mail interface. Requires the Net_SMTP class. * * PHP version 5 * * LICENSE: * * Copyright (c) 2010-2017 gERD Schaufelberger * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * 3. Neither the name of the copyright holder nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * @category Mail * @package Mail_smtpmx * @author gERD Schaufelberger <gerd@php-tools.net> * @copyright 2010-2017 gERD Schaufelberger * @license http://opensource.org/licenses/BSD-3-Clause New BSD License * @version CVS: $Id$ * @link http://pear.php.net/package/Mail/ / require_once 'Net/SMTP.php'; /* * SMTP MX implementation of the PEAR Mail interface. Requires the Net_SMTP class. * * * @access public * @author gERD Schaufelberger <gerd@php-tools.net> * @package Mail * @version $Revision$ / class Mail_smtpmx extends Mail { /* * SMTP connection object. * * @var object * @access private / var $_smtp = null; /* * The port the SMTP server is on. * @var integer * @see getservicebyname() / var $port = 25; /* * Hostname or domain that will be sent to the remote SMTP server in the * HELO / EHLO message. * * @var string * @see posix_uname() / var $mailname = 'localhost'; /* * SMTP connection timeout value. NULL indicates no timeout. * * @var integer / var $timeout = 10; /* * use either PEAR:Net_DNS or getmxrr * * @var boolean / var $withNetDns = true; /* * PEAR:Net_DNS_Resolver * * @var object / var $resolver; /* * Whether to use VERP or not. If not a boolean, the string value * will be used as the VERP separators. * * @var mixed boolean or string / var $verp = false; /* * Whether to use VRFY or not. * * @var boolean $vrfy / var $vrfy = false; /* * Switch to test mode - don't send emails for real * * @var boolean $debug / var $test = false; /* * Turn on Net_SMTP debugging? * * @var boolean $peardebug / var $debug = false; /* * internal error codes * * translate internal error identifier to PEAR-Error codes and human * readable messages. * * @var boolean $debug * @todo as I need unique error-codes to identify what exactly went wrond * I did not use intergers as it should be. Instead I added a "namespace" * for each code. This avoids conflicts with error codes from different * classes. How can I use unique error codes and stay conform with PEAR? / var $errorCode = array( 'not_connected' => array( 'code' => 1, 'msg' => 'Could not connect to any mail server ({HOST}) at port {PORT} to send mail to {RCPT}.' ), 'failed_vrfy_rcpt' => array( 'code' => 2, 'msg' => 'Recipient "{RCPT}" could not be veryfied.' ), 'failed_set_from' => array( 'code' => 3, 'msg' => 'Failed to set sender: {FROM}.' ), 'failed_set_rcpt' => array( 'code' => 4, 'msg' => 'Failed to set recipient: {RCPT}.' ), 'failed_send_data' => array( 'code' => 5, 'msg' => 'Failed to send mail to: {RCPT}.' ), 'no_from' => array( 'code' => 5, 'msg' => 'No from address has be provided.' ), 'send_data' => array( 'code' => 7, 'msg' => 'Failed to create Net_SMTP object.' ), 'no_mx' => array( 'code' => 8, 'msg' => 'No MX-record for {RCPT} found.' ), 'no_resolver' => array( 'code' => 9, 'msg' => 'Could not start resolver! Install PEAR:Net_DNS or switch off "netdns"' ), 'failed_rset' => array( 'code' => 10, 'msg' => 'RSET command failed, SMTP-connection corrupt.' ), ); /* * Constructor. * * Instantiates a new Mail_smtp:: object based on the parameters * passed in. It looks for the following parameters: * mailname The name of the local mail system (a valid hostname which matches the reverse lookup) * port smtp-port - the default comes from getservicebyname() and should work fine * timeout The SMTP connection timeout. Defaults to 30 seconds. * vrfy Whether to use VRFY or not. Defaults to false. * verp Whether to use VERP or not. Defaults to false. * test Activate test mode? Defaults to false. * debug Activate SMTP and Net_DNS debug mode? Defaults to false. * netdns whether to use PEAR:Net_DNS or the PHP build in function getmxrr, default is true * * If a parameter is present in the $params array, it replaces the * default. * * @access public * @param array Hash containing any parameters different from the * defaults. * @see _Mail_smtpmx() / function __construct($params) { if (isset($params['mailname'])) { $this->mailname = $params['mailname']; } else { // try to find a valid mailname if (function_exists('posix_uname')) { $uname = posix_uname(); $this->mailname = $uname['nodename']; } } // port number if (isset($params['port'])) { $this->_port = $params['port']; } else { $this->_port = getservbyname('smtp', 'tcp'); } if (isset($params['timeout'])) $this->timeout = $params['timeout']; if (isset($params['verp'])) $this->verp = $params['verp']; if (isset($params['test'])) $this->test = $params['test']; if (isset($params['peardebug'])) $this->test = $params['peardebug']; if (isset($params['netdns'])) $this->withNetDns = $params['netdns']; } /* * Constructor wrapper for PHP4 * * @access public * @param array Hash containing any parameters different from the defaults * @see __construct() / function Mail_smtpmx($params) { $this->__construct($params); register_shutdown_function(array(&$this, '__destruct')); } /* * Destructor implementation to ensure that we disconnect from any * potentially-alive persistent SMTP connections. / function __destruct() { if (is_object($this->_smtp)) { $this->_smtp->disconnect(); $this->_smtp = null; } } /* * Implements Mail::send() function using SMTP direct delivery * * @access public * @param mixed $recipients in RFC822 style or array * @param array $headers The array of headers to send with the mail. * @param string $body The full text of the message body, * @return mixed Returns true on success, or a PEAR_Error / function send($recipients, $headers, $body) { if (!is_array($headers)) { return PEAR::raiseError('$headers must be an array'); } $result = $this->_sanitizeHeaders($headers); if (is_a($result, 'PEAR_Error')) { return $result; } // Prepare headers $headerElements = $this->prepareHeaders($headers); if (is_a($headerElements, 'PEAR_Error')) { return $headerElements; } list($from, $textHeaders) = $headerElements; // use 'Return-Path' if possible if (!empty($headers['Return-Path'])) { $from = $headers['Return-Path']; } if (!isset($from)) { return $this->_raiseError('no_from'); } // Prepare recipients $recipients = $this->parseRecipients($recipients); if (is_a($recipients, 'PEAR_Error')) { return $recipients; } foreach ($recipients as $rcpt) { list($user, $host) = explode('@', $rcpt); $mx = $this->_getMx($host); if (is_a($mx, 'PEAR_Error')) { return $mx; } if (empty($mx)) { $info = array('rcpt' => $rcpt); return $this->_raiseError('no_mx', $info); } $connected = false; foreach ($mx as $mserver => $mpriority) { $this->_smtp = new Net_SMTP($mserver, $this->port, $this->mailname); // configure the SMTP connection. if ($this->debug) { $this->_smtp->setDebug(true); } // attempt to connect to the configured SMTP server. $res = $this->_smtp->connect($this->timeout); if (is_a($res, 'PEAR_Error')) { $this->_smtp = null; continue; } // connection established if ($res) { $connected = true; break; } } if (!$connected) { $info = array( 'host' => implode(', ', array_keys($mx)), 'port' => $this->port, 'rcpt' => $rcpt, ); return $this->_raiseError('not_connected', $info); } // Verify recipient if ($this->vrfy) { $res = $this->_smtp->vrfy($rcpt); if (is_a($res, 'PEAR_Error')) { $info = array('rcpt' => $rcpt); return $this->_raiseError('failed_vrfy_rcpt', $info); } } // mail from: $args['verp'] = $this->verp; $res = $this->_smtp->mailFrom($from, $args); if (is_a($res, 'PEAR_Error')) { $info = array('from' => $from); return $this->_raiseError('failed_set_from', $info); } // rcpt to: $res = $this->_smtp->rcptTo($rcpt); if (is_a($res, 'PEAR_Error')) { $info = array('rcpt' => $rcpt); return $this->_raiseError('failed_set_rcpt', $info); } // Don't send anything in test mode if ($this->test) { $result = $this->_smtp->rset(); $res = $this->_smtp->rset(); if (is_a($res, 'PEAR_Error')) { return $this->_raiseError('failed_rset'); } $this->_smtp->disconnect(); $this->_smtp = null; return true; } // Send data $res = $this->_smtp->data($body, $textHeaders); if (is_a($res, 'PEAR_Error')) { $info = array('rcpt' => $rcpt); return $this->_raiseError('failed_send_data', $info); } $this->_smtp->disconnect(); $this->_smtp = null; } return true; } /* * Recieve mx rexords for a spciefied host * * The MX records * * @access private * @param string $host mail host * @return mixed sorted / function _getMx($host) { $mx = array(); if ($this->withNetDns) { $res = $this->_loadNetDns(); if (is_a($res, 'PEAR_Error')) { return $res; } $response = $this->resolver->query($host, 'MX'); if (!$response) { return false; } foreach ($response->answer as $rr) { if ($rr->type == 'MX') { $mx[$rr->exchange] = $rr->preference; } } } else { $mxHost = array(); $mxWeight = array(); if (!getmxrr($host, $mxHost, $mxWeight)) { return false; } for ($i = 0; $i < count($mxHost); ++$i) { $mx[$mxHost[$i]] = $mxWeight[$i]; } } asort($mx); return $mx; } /* * initialize PEAR:Net_DNS_Resolver * * @access private * @return boolean true on success / function _loadNetDns() { if (is_object($this->resolver)) { return true; } if (!include_once 'Net/DNS.php') { return $this->_raiseError('no_resolver'); } $this->resolver = new Net_DNS_Resolver(); if ($this->debug) { $this->resolver->test = 1; } return true; } /* * raise standardized error * * include additional information in error message * * @access private * @param string $id maps error ids to codes and message * @param array $info optional information in associative array * @see _errorCode */ function _raiseError($id, $info = array()) { $code = $this->errorCode[$id]['code']; $msg = $this->errorCode[$id]['msg']; // include info to messages if (!empty($info)) { $search = array(); $replace = array(); foreach ($info as $key => $value) { array_push($search, '{' . strtoupper($key) . '}'); array_push($replace, $value); } $msg = str_replace($search, $replace, $msg); } return PEAR::raiseError($msg, $code); } } Back

Edit File : smtpmx.php | Size : 14.82 KB

<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */

/**
 * SMTP MX
 *
 * SMTP MX implementation of the PEAR Mail interface. Requires the Net_SMTP class.
 *
 * PHP version 5
 *
 * LICENSE:
 *
 * Copyright (c) 2010-2017 gERD Schaufelberger
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * @category   Mail
 * @package    Mail_smtpmx
 * @author     gERD Schaufelberger <gerd@php-tools.net>
 * @copyright  2010-2017 gERD Schaufelberger
 * @license    http://opensource.org/licenses/BSD-3-Clause New BSD License
 * @version    CVS: $Id$
 * @link       http://pear.php.net/package/Mail/
 */

require_once 'Net/SMTP.php';

/**
 * SMTP MX implementation of the PEAR Mail interface. Requires the Net_SMTP class.
 *
 *
 * @access public
 * @author  gERD Schaufelberger <gerd@php-tools.net>
 * @package Mail
 * @version $Revision$
 */
class Mail_smtpmx extends Mail {

/**
     * SMTP connection object.
     *
     * @var object
     * @access private
     */
    var $_smtp = null;

/**
     * The port the SMTP server is on.
     * @var integer
     * @see getservicebyname()
     */
    var $port = 25;

/**
     * Hostname or domain that will be sent to the remote SMTP server in the
     * HELO / EHLO message.
     *
     * @var string
     * @see posix_uname()
     */
    var $mailname = 'localhost';

/**
     * SMTP connection timeout value.  NULL indicates no timeout.
     *
     * @var integer
     */
    var $timeout = 10;

/**
     * use either PEAR:Net_DNS or getmxrr
     *
     * @var boolean
     */
    var $withNetDns = true;

/**
     * PEAR:Net_DNS_Resolver
     *
     * @var object
     */
    var $resolver;

/**
     * Whether to use VERP or not. If not a boolean, the string value
     * will be used as the VERP separators.
     *
     * @var mixed boolean or string
     */
    var $verp = false;

/**
     * Whether to use VRFY or not.
     *
     * @var boolean $vrfy
     */
    var $vrfy = false;

/**
     * Switch to test mode - don't send emails for real
     *
     * @var boolean $debug
     */
    var $test = false;

/**
     * Turn on Net_SMTP debugging?
     *
     * @var boolean $peardebug
     */
    var $debug = false;

/**
     * internal error codes
     *
     * translate internal error identifier to PEAR-Error codes and human
     * readable messages.
     *
     * @var boolean $debug
     * @todo as I need unique error-codes to identify what exactly went wrond
     *       I did not use intergers as it should be. Instead I added a "namespace"
     *       for each code. This avoids conflicts with error codes from different
     *       classes. How can I use unique error codes and stay conform with PEAR?
     */
    var $errorCode = array(
        'not_connected' => array(
            'code'  => 1,
            'msg'   => 'Could not connect to any mail server ({HOST}) at port {PORT} to send mail to {RCPT}.'
        ),
        'failed_vrfy_rcpt' => array(
            'code'  => 2,
            'msg'   => 'Recipient "{RCPT}" could not be veryfied.'
        ),
        'failed_set_from' => array(
            'code'  => 3,
            'msg'   => 'Failed to set sender: {FROM}.'
        ),
        'failed_set_rcpt' => array(
            'code'  => 4,
            'msg'   => 'Failed to set recipient: {RCPT}.'
        ),
        'failed_send_data' => array(
            'code'  => 5,
            'msg'   => 'Failed to send mail to: {RCPT}.'
        ),
        'no_from' => array(
            'code'  => 5,
            'msg'   => 'No from address has be provided.'
        ),
        'send_data' => array(
            'code'  => 7,
            'msg'   => 'Failed to create Net_SMTP object.'
        ),
        'no_mx' => array(
            'code'  => 8,
            'msg'   => 'No MX-record for {RCPT} found.'
        ),
        'no_resolver' => array(
            'code'  => 9,
            'msg'   => 'Could not start resolver! Install PEAR:Net_DNS or switch off "netdns"'
        ),
        'failed_rset' => array(
            'code'  => 10,
            'msg'   => 'RSET command failed, SMTP-connection corrupt.'
        ),
    );

/**
     * Constructor.
     *
     * Instantiates a new Mail_smtp:: object based on the parameters
     * passed in. It looks for the following parameters:
     *     mailname    The name of the local mail system (a valid hostname which matches the reverse lookup)
     *     port        smtp-port - the default comes from getservicebyname() and should work fine
     *     timeout     The SMTP connection timeout. Defaults to 30 seconds.
     *     vrfy        Whether to use VRFY or not. Defaults to false.
     *     verp        Whether to use VERP or not. Defaults to false.
     *     test        Activate test mode? Defaults to false.
     *     debug       Activate SMTP and Net_DNS debug mode? Defaults to false.
     *     netdns      whether to use PEAR:Net_DNS or the PHP build in function getmxrr, default is true
     *
     * If a parameter is present in the $params array, it replaces the
     * default.
     *
     * @access public
     * @param array Hash containing any parameters different from the
     *              defaults.
     * @see _Mail_smtpmx()
     */
    function __construct($params)
    {
        if (isset($params['mailname'])) {
            $this->mailname = $params['mailname'];
        } else {
            // try to find a valid mailname
            if (function_exists('posix_uname')) {
                $uname = posix_uname();
                $this->mailname = $uname['nodename'];
            }
        }

// port number
        if (isset($params['port'])) {
            $this->_port = $params['port'];
        } else {
            $this->_port = getservbyname('smtp', 'tcp');
        }

if (isset($params['timeout'])) $this->timeout = $params['timeout'];
        if (isset($params['verp'])) $this->verp = $params['verp'];
        if (isset($params['test'])) $this->test = $params['test'];
        if (isset($params['peardebug'])) $this->test = $params['peardebug'];
        if (isset($params['netdns'])) $this->withNetDns = $params['netdns'];
    }

/**
     * Constructor wrapper for PHP4
     *
     * @access public
     * @param array Hash containing any parameters different from the defaults
     * @see __construct()
     */
    function Mail_smtpmx($params)
    {
        $this->__construct($params);
        register_shutdown_function(array(&$this, '__destruct'));
    }

/**
     * Destructor implementation to ensure that we disconnect from any
     * potentially-alive persistent SMTP connections.
     */
    function __destruct()
    {
        if (is_object($this->_smtp)) {
            $this->_smtp->disconnect();
            $this->_smtp = null;
        }
    }

/**
     * Implements Mail::send() function using SMTP direct delivery
     *
     * @access public
     * @param mixed $recipients in RFC822 style or array
     * @param array $headers The array of headers to send with the mail.
     * @param string $body The full text of the message body,
     * @return mixed Returns true on success, or a PEAR_Error
     */
    function send($recipients, $headers, $body)
    {
        if (!is_array($headers)) {
            return PEAR::raiseError('$headers must be an array');
        }

$result = $this->_sanitizeHeaders($headers);
        if (is_a($result, 'PEAR_Error')) {
            return $result;
        }

// Prepare headers
        $headerElements = $this->prepareHeaders($headers);
        if (is_a($headerElements, 'PEAR_Error')) {
            return $headerElements;
        }
        list($from, $textHeaders) = $headerElements;

// use 'Return-Path' if possible
        if (!empty($headers['Return-Path'])) {
            $from = $headers['Return-Path'];
        }
        if (!isset($from)) {
            return $this->_raiseError('no_from');
        }

// Prepare recipients
        $recipients = $this->parseRecipients($recipients);
        if (is_a($recipients, 'PEAR_Error')) {
            return $recipients;
        }

foreach ($recipients as $rcpt) {
            list($user, $host) = explode('@', $rcpt);

$mx = $this->_getMx($host);
            if (is_a($mx, 'PEAR_Error')) {
                return $mx;
            }

if (empty($mx)) {
                $info = array('rcpt' => $rcpt);
                return $this->_raiseError('no_mx', $info);
            }

$connected = false;
            foreach ($mx as $mserver => $mpriority) {
                $this->_smtp = new Net_SMTP($mserver, $this->port, $this->mailname);

// configure the SMTP connection.
                if ($this->debug) {
                    $this->_smtp->setDebug(true);
                }

// attempt to connect to the configured SMTP server.
                $res = $this->_smtp->connect($this->timeout);
                if (is_a($res, 'PEAR_Error')) {
                    $this->_smtp = null;
                    continue;
                }

// connection established
                if ($res) {
                    $connected = true;
                    break;
                }
            }

if (!$connected) {
                $info = array(
                    'host' => implode(', ', array_keys($mx)),
                    'port' => $this->port,
                    'rcpt' => $rcpt,
                );
                return $this->_raiseError('not_connected', $info);
            }

// Verify recipient
            if ($this->vrfy) {
                $res = $this->_smtp->vrfy($rcpt);
                if (is_a($res, 'PEAR_Error')) {
                    $info = array('rcpt' => $rcpt);
                    return $this->_raiseError('failed_vrfy_rcpt', $info);
                }
            }

// mail from:
            $args['verp'] = $this->verp;
            $res = $this->_smtp->mailFrom($from, $args);
            if (is_a($res, 'PEAR_Error')) {
                $info = array('from' => $from);
                return $this->_raiseError('failed_set_from', $info);
            }

// rcpt to:
            $res = $this->_smtp->rcptTo($rcpt);
            if (is_a($res, 'PEAR_Error')) {
                $info = array('rcpt' => $rcpt);
                return $this->_raiseError('failed_set_rcpt', $info);
            }

// Don't send anything in test mode
            if ($this->test) {
                $result = $this->_smtp->rset();
                $res = $this->_smtp->rset();
                if (is_a($res, 'PEAR_Error')) {
                    return $this->_raiseError('failed_rset');
                }

$this->_smtp->disconnect();
                $this->_smtp = null;
                return true;
            }

// Send data
            $res = $this->_smtp->data($body, $textHeaders);
            if (is_a($res, 'PEAR_Error')) {
                $info = array('rcpt' => $rcpt);
                return $this->_raiseError('failed_send_data', $info);
            }

$this->_smtp->disconnect();
            $this->_smtp = null;
        }

return true;
    }

/**
     * Recieve mx rexords for a spciefied host
     *
     * The MX records
     *
     * @access private
     * @param string $host mail host
     * @return mixed sorted
     */
    function _getMx($host)
    {
        $mx = array();

if ($this->withNetDns) {
            $res = $this->_loadNetDns();
            if (is_a($res, 'PEAR_Error')) {
                return $res;
            }

$response = $this->resolver->query($host, 'MX');
            if (!$response) {
                return false;
            }

foreach ($response->answer as $rr) {
                if ($rr->type == 'MX') {
                    $mx[$rr->exchange] = $rr->preference;
                }
            }
        } else {
            $mxHost = array();
            $mxWeight = array();

if (!getmxrr($host, $mxHost, $mxWeight)) {
                return false;
            }
            for ($i = 0; $i < count($mxHost); ++$i) {
                $mx[$mxHost[$i]] = $mxWeight[$i];
            }
        }

asort($mx);
        return $mx;
    }

/**
     * initialize PEAR:Net_DNS_Resolver
     *
     * @access private
     * @return boolean true on success
     */
    function _loadNetDns()
    {
        if (is_object($this->resolver)) {
            return true;
        }

if (!include_once 'Net/DNS.php') {
            return $this->_raiseError('no_resolver');
        }

$this->resolver = new Net_DNS_Resolver();
        if ($this->debug) {
            $this->resolver->test = 1;
        }

return true;
    }

/**
     * raise standardized error
     *
     * include additional information in error message
     *
     * @access private
     * @param string $id maps error ids to codes and message
     * @param array $info optional information in associative array
     * @see _errorCode
     */
    function _raiseError($id, $info = array())
    {
        $code = $this->errorCode[$id]['code'];
        $msg = $this->errorCode[$id]['msg'];

// include info to messages
        if (!empty($info)) {
            $search = array();
            $replace = array();

foreach ($info as $key => $value) {
                array_push($search, '{' . strtoupper($key) . '}');
                array_push($replace, $value);
            }

$msg = str_replace($search, $replace, $msg);
        }

return PEAR::raiseError($msg, $code);
    }

}

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