php socket 使用smtp服务器发送邮件

<?php
/*邮件发送类
 *功能：php socket 使用smtp服务器发送邮件
 *作者:longlong
 *时间:2007-11-26
*/
class smtp {
    /* 全局变量 */
    var $smtp_port;
    var $time_out;
    var $host_name;
    var $log_file;
    var $relay_host;
    var $debug;
    var $auth;
    var $user;
    var $pass;
    /* private variables */
    var $sock;
    /* 构造函数 */
    function smtp($relay_host = "", $smtp_port = 25, $auth = false, $user, $pass) {
        $this->debug = false;
        $this->smtp_port = $smtp_port;
        $this->relay_host = $relay_host;
        $this->time_out = 30; //is used in fsockopen()
        //
        $this->auth = $auth; //auth
        $this->user = $user;
        $this->pass = $pass;
        //
        $this->host_name = "localhost"; //is used in helo command
        $this->log_file = "";
        $this->sock = false;
    }
    /* 主函数，发送邮件 */
    function sendmail($flag, $boundary, $to, $from, $subject = "", $body = "", $mailtype, $cc = "", $bcc = "", $additional_headers = "") {
        $mail_from = $this->get_address($this->strip_comment($from));
        $body = ereg_replace("(^|(rn))(.)", "1.3", $body);
        $header = "mime-version:1.0rn";
        //*
        if ($mailtype == "html") {
            //echo $boundary;exit;
            if ($flag == 2) {
                $header.= "content-type:multipart/mixed; boundary= $boundaryrn";
                //$header .= "content-type:text/htmlrn";
                
            } else {
                $header.= "content-type:text/htmlrn";
            }
        }
        //*/
        $header.= "to: " . $to . "rn";
        if ($cc != "") {
            $header.= "cc: " . $cc . "rn";
        }
        $header.= "from: $from<" . $from . ">rn";
        $header.= "subject: " . $subject . "rn";
        $header.= $additional_headers;
        $header.= "date: " . date("r") . "rn";
        $header.= "x-mailer:by redhat (php/" . phpversion() . ")rn";
        //$header.=$body;//edit by shaolong
        list($msec, $sec) = explode(" ", microtime());
        $header.= "message-id: <" . date("ymdhis", $sec) . "." . ($msec * 1000000) . "." . $mail_from . ">rn";
        $to = explode(",", $this->strip_comment($to));
        if ($cc != "") {
            $to = array_merge($to, explode(",", $this->strip_comment($cc)));
        }
        if ($bcc != "") {
            $to = array_merge($to, explode(",", $this->strip_comment($bcc)));
        }
        $sent = true;
        foreach ($to as $rcpt_to) {
            $rcpt_to = $this->get_address($rcpt_to);
            if (!$this->smtp_sockopen($rcpt_to)) {
                $this->log_write("error: cannot send email to " . $rcpt_to . "n");
                $sent = false;
                continue;
            }
            if ($this->smtp_send($this->host_name, $mail_from, $rcpt_to, $header, $body)) {
                $this->log_write("e-mail has been sent to <" . $rcpt_to . ">n");
            } else {
                $this->log_write("error: cannot send email to <" . $rcpt_to . ">n");
                $sent = false;
            }
            fclose($this->sock);
            $this->log_write("disconnected from remote hostn");
        }
        return $sent;
    }
    /* 私有函数 */
    function smtp_send($helo, $from, $to, $header, $body = "") {
        if (!$this->smtp_putcmd("helo", $helo)) {
            return $this->smtp_error("sending helo command");
        }
        //auth
        if ($this->auth) {
            if (!$this->smtp_putcmd("auth login", base64_encode($this->user))) {
                return $this->smtp_error("sending helo command");
            }
            if (!$this->smtp_putcmd("", base64_encode($this->pass))) {
                return $this->smtp_error("sending helo command");
            }
        }
        //
        if (!$this->smtp_putcmd("mail", "from:<" . $from . ">")) {
            return $this->smtp_error("sending mail from command");
        }
        if (!$this->smtp_putcmd("rcpt", "to:<" . $to . ">")) {
            return $this->smtp_error("sending rcpt to command");
        }
        if (!$this->smtp_putcmd("data")) {
            return $this->smtp_error("sending data command");
        }
        if (!$this->smtp_message($header, $body)) {
            return $this->smtp_error("sending message");
        }
        if (!$this->smtp_eom()) {
            return $this->smtp_error("sending <cr><lf>.<cr><lf> [eom]");
        }
        if (!$this->smtp_putcmd("quit")) {
            return $this->smtp_error("sending quit command");
        }
        return true;
    }
    function smtp_sockopen($address) {
        if ($this->relay_host == "") {
            return $this->smtp_sockopen_mx($address);
        } else {
            return $this->smtp_sockopen_relay();
        }
    }
    function smtp_sockopen_relay() {
        $this->log_write("trying to " . $this->relay_host . ":" . $this->smtp_port . "n");
        $this->sock = @fsockopen($this->relay_host, $this->smtp_port, $errno, $errstr, $this->time_out);
        if (!($this->sock && $this->smtp_ok())) {
            $this->log_write("error: cannot connenct to relay host " . $this->relay_host . "n");
            $this->log_write("error: " . $errstr . " (" . $errno . ")n");
            return false;
        }
        $this->log_write("connected to relay host " . $this->relay_host . "n");
        return true;
    }
    function smtp_sockopen_mx($address) {
        $domain = ereg_replace("^.+@([^@]+)$", "1", $address);
        if (!@getmxrr($domain, $mxhosts)) {
            $this->log_write("error: cannot resolve mx "".$domain.""n");
            return false;
        }
        foreach ($mxhosts as $host) {
            $this->log_write("trying to " . $host . ":" . $this->smtp_port . "n");
            $this->sock = @fsockopen($host, $this->smtp_port, $errno, $errstr, $this->time_out);
            if (!($this->sock && $this->smtp_ok())) {
                $this->log_write("warning: cannot connect to mx host " . $host . "n");
                $this->log_write("error: " . $errstr . " (" . $errno . ")n");
                continue;
            }
            $this->log_write("connected to mx host " . $host . "n");
            return true;
        }
        $this->log_write("error: cannot connect to any mx hosts (" . implode(", ", $mxhosts) . ")n");
        return false;
    }
    function smtp_message($header, $body) {
        fputs($this->sock, $header . "rn" . $body);
        $this->smtp_debug("> " . str_replace("rn", "n" . "> ", $header . "n> " . $body . "n> "));
        return true;
    }
    function smtp_eom() {
        fputs($this->sock, "rn.rn");
        $this->smtp_debug(". [eom]n");
        return $this->smtp_ok();
    }
    function smtp_ok() {
        $response = str_replace("rn", "", fgets($this->sock, 512));
        $this->smtp_debug($response . "n");
        if (!ereg("^[23]", $response)) {
            fputs($this->sock, "quitrn");
            fgets($this->sock, 512);
            $this->log_write("error: remote host returned "".$response.""n");
            return false;
        }
        return true;
    }
    function smtp_putcmd($cmd, $arg = "") {
        if ($arg != "") {
            if ($cmd == "") $cmd = $arg;
            else $cmd = $cmd . " " . $arg;
        }
        fputs($this->sock, $cmd . "rn");
        $this->smtp_debug("> " . $cmd . "n");
        return $this->smtp_ok();
    }
    function smtp_error($string) {
        $this->log_write("error: error occurred while " . $string . ".n");
        return false;
    }
    function log_write($message) {
        $this->smtp_debug($message);
        if ($this->log_file == "") {
            return true;
        }
        $message = date("m d h:i:s ") . get_current_user() . "[" . getmypid() . "]: " . $message;
        if (!@file_exists($this->log_file) || !($fp = @fopen($this->log_file, "a"))) {
            $this->smtp_debug("warning: cannot open log file "".$this->log_file.""n");
            return false;;
        }
        flock($fp, lock_ex);
        fputs($fp, $message);
        fclose($fp);
        return true;
    }
    function strip_comment($address) {
        $comment = "([^()]*)";
        while (ereg($comment, $address)) {
            $address = ereg_replace($comment, "", $address);
        }
        return $address;
    }
    function get_address($address) {
        $address = ereg_replace("([ trn])+", "", $address);
        $address = ereg_replace("^.*<(.+)>.*$", "1", $address);
        return $address;
    }
    function smtp_debug($message) {
        if ($this->debug) {
            echo $message;
        }
    }
}

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