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+<?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);
+    }
+
+}