smtp.php

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<?php
/* vim: set expandtab softtabstop=4 tabstop=4 shiftwidth=4: */
// +----------------------------------------------------------------------+
// | PHP Version 4                                                        |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2003 The PHP Group                                |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.02 of the PHP license,      |
// | that is bundled with this package in the file LICENSE, and is        |
// | available at through the world-wide-web at                           |
// | http://www.php.net/license/2_02.txt.                                 |
// | If you did not receive a copy of the PHP license and are unable to   |
// | obtain it through the world-wide-web, please send a note to          |
// | [e-mail] so we can mail you a copy immediately.               |
// +----------------------------------------------------------------------+
// | Authors: Chuck Hagenbuch <[e-mail]>                           |
// |          Jon Parise <[e-mail]>                                    |
// |          Damian Alejandro Fernandez Sosa <[e-mail]>      |
// +----------------------------------------------------------------------+
//
// $Id: SMTP.php 6819 2007-06-20 13:09:21Z kevin_fourie $

require_once 'PEAR.php';
require_once 'Net/Socket.php';

/**
 * Provides an implementation of the SMTP protocol using PEAR's
 * Net_Socket:: class.
 *
 * @package Net_SMTP
 * @author  Chuck Hagenbuch <[e-mail]>
 * @author  Jon Parise <[e-mail]>
 * @author  Damian Alejandro Fernandez Sosa <[e-mail]>
 *
 * @example basic.php   A basic implementation of the Net_SMTP package.
 */
class Net_SMTP
{

    /**
     * The server to connect to.
     * @var string
     * @access public
     */
    var $host = 'localhost';

    /**
     * The port to connect to.
     * @var int
     * @access public
     */
    var $port = 25;

    /**
     * The value to give when sending EHLO or HELO.
     * @var string
     * @access public
     */
    var $localhost = 'localhost';

    /**
     * List of supported authentication methods, in preferential order.
     * @var array
     * @access public
     */
    var $auth_methods = array('DIGEST-MD5', 'CRAM-MD5', 'LOGIN', 'PLAIN');

    /**
     * Should debugging output be enabled?
     * @var boolean
     * @access private
     */
    var $_debug = false;

    /**
     * The socket resource being used to connect to the SMTP server.
     * @var resource
     * @access private
     */
    var $_socket = null;

    /**
     * The most recent server response code.
     * @var int
     * @access private
     */
    var $_code = -1;

    /**
     * The most recent server response arguments.
     * @var array
     * @access private
     */
    var $_arguments = array();

    /**
     * Stores detected features of the SMTP server.
     * @var array
     * @access private
     */
    var $_esmtp = array();

    /**
     * Instantiates a new Net_SMTP object, overriding any defaults
     * with parameters that are passed in.
     *
     * If you have SSL support in PHP, you can connect to a server
     * over SSL using an 'ssl://' prefix:
     *
     *   // 465 is a common smtps port.
     *   $smtp = new Net_SMTP('ssl://mail.host.com', 465);
     *   $smtp->connect();
     *
     * @param string  $host       The server to connect to.
     * @param integer $port       The port to connect to.
     * @param string  $localhost  The value to give when sending EHLO or HELO.
     *
     * @access  public
     * @since   1.0
     */
    function Net_SMTP($host = null, $port = null, $localhost = null)
    {
        if (isset($host)) $this->host = $host;
        if (isset($port)) $this->port = $port;
        if (isset($localhost)) $this->localhost = $localhost;

        $this->_socket = &new Net_Socket();

        /*
         * Include the Auth_SASL package.  If the package is not available,
         * we disable the authentication methods that depend upon it.
         */
        if ((@include_once 'Auth/SASL.php') === false) {
            $pos = array_search('DIGEST-MD5', $this->auth_methods);
            unset($this->auth_methods[$pos]);
            $pos = array_search('CRAM-MD5', $this->auth_methods);
            unset($this->auth_methods[$pos]);
        }
    }

    /**
     * Set the value of the debugging flag.
     *
     * @param   boolean $debug      New value for the debugging flag.
     *
     * @access  public
     * @since   1.1.0
     */
    function setDebug($debug)
    {
        $this->_debug = $debug;
    }

    /**
     * Send the given string of data to the server.
     *
     * @param   string  $data       The string of data to send.
     *
     * @return  mixed   True on success or a PEAR_Error object on failure.
     *
     * @access  private
     * @since   1.1.0
     */
    function _send($data)
    {
        if ($this->_debug) {
            echo "DEBUG: Send: $data\n";
        }

        if (PEAR::isError($error = $this->_socket->write($data))) {
            return PEAR::raiseError('Failed to write to socket: ' .
                                    $error->getMessage());
        }

        return true;
    }

    /**
     * Send a command to the server with an optional string of
     * arguments.  A carriage return / linefeed (CRLF) sequence will
     * be appended to each command string before it is sent to the
     * SMTP server - an error will be thrown if the command string
     * already contains any newline characters. Use _send() for
     * commands that must contain newlines.
     *
     * @param   string  $command    The SMTP command to send to the server.
     * @param   string  $args       A string of optional arguments to append
     *                              to the command.
     *
     * @return  mixed   The result of the _send() call.
     *
     * @access  private
     * @since   1.1.0
     */
    function _put($command, $args = '')
    {
        if (!empty($args)) {
            $command .= ' ' . $args;
        }

        if (strcspn($command, "\r\n") !== strlen($command)) {
            return PEAR::raiseError('Commands cannot contain newlines');
        }

        return $this->_send($command . "\r\n");
    }

    /**
     * Read a reply from the SMTP server.  The reply consists of a response
     * code and a response message.
     *
     * @param   mixed   $valid      The set of valid response codes.  These
     *                              may be specified as an array of integer
     *                              values or as a single integer value.
     *
     * @return  mixed   True if the server returned a valid response code or
     *                  a PEAR_Error object is an error condition is reached.
     *
     * @access  private
     * @since   1.1.0
     *
     * @see     getResponse
     */
    function _parseResponse($valid)
    {
        $this->_code = -1;
        $this->_arguments = array();

        while ($line = $this->_socket->readLine()) {
            if ($this->_debug) {
                echo "DEBUG: Recv: $line\n";
            }

            /* If we receive an empty line, the connection has been closed. */
            if (empty($line)) {
                $this->disconnect();
                return PEAR::raiseError('Connection was unexpectedly closed');
            }

            /* Read the code and store the rest in the arguments array. */
            $code = substr($line, 0, 3);
            $this->_arguments[] = trim(substr($line, 4));

            /* Check the syntax of the response code. */
            if (is_numeric($code)) {
                $this->_code = (int)$code;
            } else {
                $this->_code = -1;
                break;
            }

            /* If this is not a multiline response, we're done. */
            if (substr($line, 3, 1) != '-') {
                break;
            }
        }

        /* Compare the server's response code with the valid code. */
        if (is_int($valid) && ($this->_code === $valid)) {
            return true;
        }

        /* If we were given an array of valid response codes, check each one. */
        if (is_array($valid)) {
            foreach ($valid as $valid_code) {
                if ($this->_code === $valid_code) {
                    return true;
                }
            }
        }

        return PEAR::raiseError('Invalid response code received from server');
    }

    /**
     * Return a 2-tuple containing the last response from the SMTP server.
     *
     * @return  array   A two-element array: the first element contains the
     *                  response code as an integer and the second element
     *                  contains the response's arguments as a string.
     *
     * @access  public
     * @since   1.1.0
     */
    function getResponse()
    {
        return array($this->_code, join("\n", $this->_arguments));
    }

    /**
     * Attempt to connect to the SMTP server.
     *
     * @param   int     $timeout    The timeout value (in seconds) for the
     *                              socket connection.
     * @param   bool    $persistent Should a persistent socket connection
     *                              be used?
     *
     * @return mixed Returns a PEAR_Error with an error message on any
     *               kind of failure, or true on success.
     * @access public
     * @since  1.0
     */
    function connect($timeout = null, $persistent = false)
    {
        $result = $this->_socket->connect($this->host, $this->port,
                                          $persistent, $timeout);
        if (PEAR::isError($result)) {
            return PEAR::raiseError('Failed to connect socket: ' .
                                    $result->getMessage());
        }

        if (PEAR::isError($error = $this->_parseResponse(220))) {
            return $error;
        }
        if (PEAR::isError($error = $this->_negotiate())) {
            return $error;
        }

        return true;
    }

    /**
     * Attempt to disconnect from the SMTP server.
     *
     * @return mixed Returns a PEAR_Error with an error message on any
     *               kind of failure, or true on success.
     * @access public
     * @since  1.0
     */
    function disconnect()
    {