class.smtp.php

一个通用的php网站的会员系统和通行证系统

<?php
////////////////////////////////////////////////////
// SMTP - PHP SMTP class
//
// Version 1.02
//
// Define an SMTP class that can be used to connect
// and communicate with any SMTP server. It implements
// all the SMTP functions defined in RFC821 except TURN.
//
// Author: Chris Ryan
//
// License: LGPL, see LICENSE
////////////////////////////////////////////////////

/**
 * SMTP is rfc 821 compliant and implements all the rfc 821 SMTP
 * commands except TURN which will always return a not implemented
 * error. SMTP also provides some utility methods for sending mail
 * to an SMTP server.
 *
 * @package PHPMailer
 * @author  Chris Ryan
 */
class SMTP
{
    /**
     *  SMTP server port
     *  @var int
     */
    var $SMTP_PORT = 25;

    /**
     *  SMTP reply line ending
     *  @var string
     */
    var $CRLF = "\r\n";

    /**
     *  Sets whether debugging is turned on
     *  @var bool
     */
    var $do_debug;       // the level of debug to perform

    /**#@+
     * @access private
     */
    var $smtp_conn;      // the socket to the server
    var $error;          // error if any on the last call
    var $helo_rply;      // the reply the server sent to us for HELO
    /**#@-*/

    /**
     * Initialize the class so that the data is in a known state.
     *
     * @access public
     *
     * @return void
     */
    function SMTP()
    {
        $this->smtp_conn = 0;
        $this->error = null;
        $this->helo_rply = null;

        $this->do_debug = 0;
    }

    /*************************************************************
     *                    CONNECTION FUNCTIONS                  *
     ***********************************************************/

    /**
     * Connect to the server specified on the port specified.
     * If the port is not specified use the default SMTP_PORT.
     * If tval is specified then a connection will try and be
     * established with the server for that number of seconds.
     * If tval is not specified the default is 30 seconds to
     * try on the connection.
     *
     * SMTP CODE SUCCESS: 220
     * SMTP CODE FAILURE: 421
     *
     * @access public
     *
     * @return bool
     */
    function Connect($host, $port=0, $tval=30)
    {
        // set the error val to null so there is no confusion
        $this->error = null;

        // make sure we are __not__ connected
        if ($this->connected()) {
            // ok we are connected! what should we do?
            // for now we will just give an error saying we
            // are already connected
            $this->error =
                array("error" => "Already connected to a server");
            return false;
        }

        if (empty($port)) {
            $port = $this->SMTP_PORT;
        }

        //connect to the smtp server
        $this->smtp_conn = fsockopen($host, // the host of the server
                                     $port, // the port to use
                                     $errno, // error number if any
                                     $errstr, // error message if any
                                     $tval); // give up after ? secs
        // verify we connected properly
        if (empty($this->smtp_conn)) {
            $this->error = array("error" => "Failed to connect to server",
                                 "errno" => $errno,
                                 "errstr" => $errstr);
            if ($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] .
                         ": $errstr ($errno)" . $this->CRLF;
            }
            return false;
        }

        // sometimes the SMTP server takes a little longer to respond
        // so we will give it a longer timeout for the first read
        // Windows still does not have support for this timeout function
        if (substr(PHP_OS, 0, 3) != "WIN")
           socket_set_timeout($this->smtp_conn, $tval, 0);

        // get any announcement stuff
        $announce = $this->get_lines();

        //  set the timeout  of any socket functions at 1/10 of a second
        //if (function_exists("socket_set_timeout"))
        //   socket_set_timeout($this->smtp_conn, 0, 100000);

        if ($this->do_debug >= 2) {
            echo "SMTP -> FROM SERVER:" . $this->CRLF . $announce;
        }

        return true;
    }

    /**
     * Performs SMTP authentication.  Must be run after running the
     * Hello() method.  Returns true if successfully authenticated.
     *
     * @access public
     *
     * @return bool
     */
    function Authenticate($username, $password)
    {
        // Start authentication
        fputs($this->smtp_conn, "AUTH LOGIN" . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply, 0, 3);

        if ($code != 334) {
            $this->error =
                array("error" => "AUTH not accepted from server",
                      "smtp_code" => $code,
                      "smtp_msg" => substr($rply, 4));
            if ($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] .
                         ": " . $rply . $this->CRLF;
            }
            return false;
        }

        // Send encoded username
        fputs($this->smtp_conn, base64_encode($username) . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply, 0, 3);

        if ($code != 334) {
            $this->error =
                array("error" => "Username not accepted from server",
                      "smtp_code" => $code,
                      "smtp_msg" => substr($rply, 4));
            if ($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] .
                         ": " . $rply . $this->CRLF;
            }
            return false;
        }

        // Send encoded password
        fputs($this->smtp_conn, base64_encode($password) . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply, 0, 3);

        if ($code != 235) {
            $this->error =
                array("error" => "Password not accepted from server",
                      "smtp_code" => $code,
                      "smtp_msg" => substr($rply, 4));
            if ($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] .
                         ": " . $rply . $this->CRLF;
            }
            return false;
        }

        return true;
    }

    /**
     * Returns true if connected to a server otherwise false
     *
     * @access public
     *
     * @return bool
     */
    function Connected()
    {
        if (!empty($this->smtp_conn)) {
            $sock_status = socket_get_status($this->smtp_conn);
            if ($sock_status["eof"]) {
                // hmm this is an odd situation... the socket is
                // valid but we aren't connected anymore
                if ($this->do_debug >= 1) {
                    echo "SMTP -> NOTICE:" . $this->CRLF .
                         "EOF caught while checking if connected";
                }
                $this->Close();
                return false;
            }
            return true; // everything looks good
        }
        return false;
    }

    /**
     * Closes the socket and cleans up the state of the class.
     * It is not considered good to use this function without
     * first trying to use QUIT.
     *
     * @access public
     *
     * @return void
     */
    function Close()
    {
        $this->error = null; // so there is no confusion
        $this->helo_rply = null;
        if (!empty($this->smtp_conn)) {
            // close the connection and cleanup
            fclose($this->smtp_conn);
            $this->smtp_conn = 0;
        }
    }


    /***************************************************************
     *                        SMTP COMMANDS                       *
     *************************************************************/

    /**
     * Issues a data command and sends the msg_data to the server
     * finalizing the mail transaction. $msg_data is the message
     * that is to be sent with the headers. Each header needs to be
     * on a single line followed by a <CRLF> with the message headers
     * and the message body being separated by and additional <CRLF>.
     *
     * Implements rfc 821: DATA <CRLF>
     *
     * SMTP CODE INTERMEDIATE: 354
     *     [data]
     *     <CRLF>.<CRLF>
     *     SMTP CODE SUCCESS: 250
     *     SMTP CODE FAILURE: 552,554,451,452
     * SMTP CODE FAILURE: 451,554
     * SMTP CODE ERROR  : 500,501,503,421
     *
     * @access public
     *
     * @return bool
     */
    function Data($msg_data)
    {
        $this->error = null; // so no confusion is caused

        if (!$this->connected()) {
            $this->error = array(
                    "error" => "Called Data() without being connected");
            return false;
        }

        fputs($this->smtp_conn, "DATA" . $this->CRLF);

        $rply = $this->get_lines();
        $code = substr($rply, 0, 3);

        if ($this->do_debug >= 2) {
            echo "SMTP -> FROM SERVER:" . $this->CRLF . $rply;
        }

        if ($code != 354) {
            $this->error =
                array("error" => "DATA command not accepted from server",
                      "smtp_code" => $code,
                      "smtp_msg" => substr($rply, 4));
            if ($this->do_debug >= 1) {
                echo "SMTP -> ERROR: " . $this->error["error"] .
                         ": " . $rply . $this->CRLF;
            }
            return false;
        }

        // the server is ready to accept data!
        // according to rfc 821 we should not send more than 1000
        // including the CRLF
        // characters on a single line so we will break the data up
        // into lines by \r and/or \n then if needed we will break
        // each of those into smaller lines to fit within the limit.
        // in addition we will be looking for lines that start with
        // a period '.' and append and additional period '.' to that
        // line. NOTE: this does not count towards are limit.

        // normalize the line breaks so we know the explode works
        $msg_data = str_replace("\r\n", "\n", $msg_data);
        $msg_data = str_replace("\r", "\n", $msg_data);
        $lines = explode("\n", $msg_data);

        // we need to find a good way to determine is headers are
        // in the msg_data or if it is a straight msg body
        // currently I'm assuming rfc 822 definitions of msg headers
        // and if the first field of the first line (':' sperated)
        // does not contain a space then it _should_ be a header
        // and we can process all lines before a blank "" line as
        // headers.
        $field = substr($lines[0], 0, strpos($lines[0], ":"));
        $in_headers = false;
        if (!empty($field) && !strstr($field, " ")) {
            $in_headers = true;
        }

        $max_line_length = 998; // used below; set here for ease in change

        while (list(,$line) = @each($lines)) {
            $lines_out = null;
            if ($line == "" && $in_headers) {
                $in_headers = false;
            }
            // ok we need to break this line up into several
            // smaller lines
            while (strlen($line) > $max_line_length) {
                $pos = strrpos(substr($line, 0, $max_line_length), " ");

                // Patch to fix DOS attack
                if (!$pos) {
                    $pos = $max_line_length - 1;
                }

                $lines_out[] = substr($line, 0, $pos);
                $line = substr($line, $pos + 1);
                // if we are processing headers we need to
                // add a LWSP-char to the front of the new line
                // rfc 822 on long msg headers
                if ($in_headers) {
                    $line = "\t" . $line;
                }
            }