<?php
/***************************************************************************
 *                              smtp.php
 *                       -------------------
 *   begin                : Wed May 09 2001
 *   copyright            : (C) 2001 The phpBB Group
 *   email                : support@phpbb.com
 *
 *   Id: smtp.php,v 1.16.2.10 2005/05/06 20:50:11 acydburn Exp
 *
 ***************************************************************************/

/***************************************************************************
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 ***************************************************************************/

define('SMTP_INCLUDED', 1);

//
// This function has been modified as provided
// by SirSir to allow multiline responses when
// using SMTP Extensions
//
function server_parse($socket, $response, $line = __LINE__)
{
        while (substr($server_response, 3, 1) != ' ')
        {
                if (!($server_response = fgets($socket, 256)))
                {
                        message_die(GENERAL_ERROR, "Couldn't get mail server response codes", "", $line, __FILE__);
                }
        }

        if (!(substr($server_response, 0, 3) == $response))
        {
                message_die(GENERAL_ERROR, "Ran into problems sending Mail. Response: $server_response", "", $line, __FILE__);
        }
}

// Replacement or substitute for PHP's mail command
function smtpmail($mail_to, $subject, $message, $headers = '')
{
        global $board_config;

        // Fix any bare linefeeds in the message to make it RFC821 Compliant.
        $message = preg_replace("#(?<!\r)\n#si", "\r\n", $message);

        if ($headers != '')
        {
                if (is_array($headers))
                {
                        if (sizeof($headers) > 1)
                        {
                                $headers = join("\n", $headers);
                        }
                        else
                        {
                                $headers = $headers[0];
                        }
                }
                $headers = chop($headers);

                // Make sure there are no bare linefeeds in the headers
                $headers = preg_replace('#(?<!\r)\n#si', "\r\n", $headers);

                // Ok this is rather confusing all things considered,
                // but we have to grab bcc and cc headers and treat them differently
                // Something we really didn't take into consideration originally
                $header_array = explode("\r\n", $headers);
                @reset($header_array);

                $headers = '';
                while(list(, $header) = each($header_array))
                {
                        if (preg_match('#^cc:#si', $header))
                        {
                                $cc = preg_replace('#^cc:(.*)#si', '\1', $header);
                        }
                        else if (preg_match('#^bcc:#si', $header))
                        {
                                $bcc = preg_replace('#^bcc:(.*)#si', '\1', $header);
                                $header = '';
                        }
                        $headers .= ($header != '') ? $header . "\r\n" : '';
                }

                $headers = chop($headers);
		$cc = explode(', ', $cc);
		$bcc = explode(', ', $bcc);
        }

        if (trim($subject) == '')
        {
                message_die(GENERAL_ERROR, "No email Subject specified", "", __LINE__, __FILE__);
        }

        if (trim($message) == '')
        {
                message_die(GENERAL_ERROR, "Email message was blank", "", __LINE__, __FILE__);
        }


        // Ok we have error checked as much as we can to this point let's get on
        // it already.
        if( !$socket = @fsockopen($board_config['smtp_host'], 25, $errno, $errstr, 20) )
        {
                message_die(GENERAL_ERROR, "Could not connect to smtp host : $errno : $errstr", "", __LINE__, __FILE__);
        }

        // Wait for reply
        server_parse($socket, "220", __LINE__);

        // Do we want to use AUTH?, send RFC2554 EHLO, else send RFC821 HELO
        // This improved as provided by SirSir to accomodate
        if( !empty($board_config['smtp_username']) && !empty($board_config['smtp_password']) )
        {
                fputs($socket, "EHLO " . $board_config['smtp_host'] . "\r\n");
                server_parse($socket, "250", __LINE__);

                fputs($socket, "AUTH LOGIN\r\n");
                server_parse($socket, "334", __LINE__);

                fputs($socket, base64_encode($board_config['smtp_username']) . "\r\n");
                server_parse($socket, "334", __LINE__);

                fputs($socket, base64_encode($board_config['smtp_password']) . "\r\n");
                server_parse($socket, "235", __LINE__);
        }
        else
        {
                fputs($socket, "HELO " . $board_config['smtp_host'] . "\r\n");
                server_parse($socket, "250", __LINE__);
        }

        // From this point onward most server response codes should be 250
        // Specify who the mail is from....
        fputs($socket, "MAIL FROM: <" . $board_config['board_email'] . ">\r\n");
        server_parse($socket, "250", __LINE__);

        // Specify each user to send to and build to header.
	$to_header = '';

	// Add an additional bit of error checking to the To field.
	$mail_to = (trim($mail_to) == '') ? 'Undisclosed-recipients:;' : trim($mail_to);
	if (preg_match('#[^ ]+\@[^ ]+#', $mail_to))
	{
		fputs($socket, "RCPT TO: <$mail_to>\r\n");
		server_parse($socket, "250", __LINE__);
	}

        // Ok now do the CC and BCC fields...
        @reset($bcc);
        while(list(, $bcc_address) = each($bcc))
        {
                // Add an additional bit of error checking to bcc header...
                $bcc_address = trim($bcc_address);
                if (preg_match('#[^ ]+\@[^ ]+#', $bcc_address))
                {
                        fputs($socket, "RCPT TO: <$bcc_address>\r\n");
                        server_parse($socket, "250", __LINE__);
                }
        }

        @reset($cc);
        while(list(, $cc_address) = each($cc))
        {
                // Add an additional bit of error checking to cc header
                $cc_address = trim($cc_address);
                if (preg_match('#[^ ]+\@[^ ]+#', $cc_address))
                {
                        fputs($socket, "RCPT TO: <$cc_address>\r\n");
                        server_parse($socket, "250", __LINE__);
                }
        }

        // Ok now we tell the server we are ready to start sending data
        fputs($socket, "DATA\r\n");

        // This is the last response code we look for until the end of the message.
        server_parse($socket, "354", __LINE__);

        // Send the Subject Line...
        fputs($socket, "Subject: $subject\r\n");

        // Now the To Header.
        fputs($socket, "To: $mail_to\r\n");

        // Now any custom headers....
        fputs($socket, "$headers\r\n\r\n");

        // Ok now we are ready for the message...
        fputs($socket, "$message\r\n");

        // Ok the all the ingredients are mixed in let's cook this puppy...
        fputs($socket, ".\r\n");
        server_parse($socket, "250", __LINE__);

        // Now tell the server we are done and close the socket...
        fputs($socket, "QUIT\r\n");
        fclose($socket);

        return TRUE;
}

?>