<?php

/***********************************************************************

  Copyright (C) 2002-2008  PunBB.org

  This file is part of PunBB.

  PunBB 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.

  PunBB is distributed in the hope that it will be useful, but

  WITHOUT ANY WARRANTY; without even the implied warranty of

  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License

  along with this program; if not, write to the Free Software

  Foundation, Inc., 59 Temple Place, Suite 330, Boston,

  MA  02111-1307  USA

************************************************************************/

// Make sure no one attempts to run this script "directly"

if (!defined('PUN'))

	exit;

//

// Validate an e-mail address

//

function is_valid_email($email)

{

	if (strlen($email) > 80)

		return false;

	return preg_match('/^(([^<>()[\]\\.,;:\s@"\']+(\.[^<>()[\]\\.,;:\s@"\']+)*)|("[^"\']+"))@((\[\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\])|(([a-zA-Z\d\-]+\.)+[a-zA-Z]{2,}))$/', $email);

}

//

// Check if $email is banned

//

function is_banned_email($email)

{

	global $pun_db, $pun_bans;

	foreach ($pun_bans as $cur_ban)

	{

		if ($cur_ban['email'] != '' &&

			($email == $cur_ban['email'] ||

			(strpos($cur_ban['email'], '@') === false && stristr($email, '@'.$cur_ban['email']))))

			return true;

	}

	return false;

}

//

// Wrapper for PHP's mail()

//

function pun_mail($to, $subject, $message, $from = '')

{

	global $pun_config, $lang_common;

	// Default sender/return address

	if (!$from)

		$from = '"'.sprintf($lang_common['Forum mailer'], str_replace('"', '', $pun_config['o_board_title'])).'" <'.$pun_config['o_webmaster_email'].'>';

	// Do a little spring cleaning

	$to = trim(preg_replace('#[\n\r]+#s', '', $to));

	$subject = trim(preg_replace('#[\n\r]+#s', '', $subject));

	$from = trim(preg_replace('#[\n\r:]+#s', '', $from));

	$headers = 'From: '.$from."\r\n".'Date: '.gmdate('r')."\r\n".'MIME-Version: 1.0'."\r\n".'Content-transfer-encoding: 8bit'."\r\n".'Content-type: text/plain; charset=utf-8'."\r\n".'X-Mailer: PunBB Mailer';

	// Make sure all linebreaks are CRLF in message (and strip out any NULL bytes)

	$message = str_replace(array("\n", "\0"), array("\r\n", ''), pun_linebreaks($message));

	if ($pun_config['o_smtp_host'] != '')

		smtp_mail($to, $subject, $message, $headers);

	else

	{

		// Change the linebreaks used in the headers according to OS

		if (strtoupper(substr(PHP_OS, 0, 3)) == 'MAC')

			$headers = str_replace("\r\n", "\r", $headers);

		else if (strtoupper(substr(PHP_OS, 0, 3)) != 'WIN')

			$headers = str_replace("\r\n", "\n", $headers);

		mail($to, $subject, $message, $headers);

	}

}

//

// This function was originally a part of the phpBB Group forum software phpBB2 (http://www.phpbb.com).

// They deserve all the credit for writing it. I made small modifications for it to suit PunBB and it's coding standards.

//

function server_parse($socket, $expected_response)

{

	$server_response = '';

	while (substr($server_response, 3, 1) != ' ')

	{

		if (!($server_response = fgets($socket, 256)))

			error('Couldn\'t get mail server response codes. Please contact the forum administrator.', __FILE__, __LINE__);

	}

	if (!(substr($server_response, 0, 3) == $expected_response))

		error('Unable to send e-mail. Please contact the forum administrator with the following error message reported by the SMTP server: "'.$server_response.'"', __FILE__, __LINE__);

}

//

// This function was originally a part of the phpBB Group forum software phpBB2 (http://www.phpbb.com).

// They deserve all the credit for writing it. I made small modifications for it to suit PunBB and it's coding standards.

//

function smtp_mail($to, $subject, $message, $headers = '')

{

	global $pun_config;

	$recipients = explode(',', $to);

	// Are we using port 25 or a custom port?

	if (strpos($pun_config['o_smtp_host'], ':') !== false)

		list($smtp_host, $smtp_port) = explode(':', $pun_config['o_smtp_host']);

	else

	{

		$smtp_host = $pun_config['o_smtp_host'];

		$smtp_port = 25;

	}

	if ($pun_config['o_smtp_ssl'] == '1')

		$smtp_host = 'ssl://'.$smtp_host;

	if (!($socket = fsockopen($smtp_host, $smtp_port, $errno, $errstr, 15)))

		error('Could not connect to smtp host "'.$pun_config['o_smtp_host'].'" ('.$errno.') ('.$errstr.').', __FILE__, __LINE__);

	server_parse($socket, '220');

	if ($pun_config['o_smtp_user'] != '' && $pun_config['o_smtp_pass'] != '')

	{

		fwrite($socket, 'EHLO '.$smtp_host."\r\n");

		server_parse($socket, '250');

		fwrite($socket, 'AUTH LOGIN'."\r\n");

		server_parse($socket, '334');

		fwrite($socket, base64_encode($pun_config['o_smtp_user'])."\r\n");

		server_parse($socket, '334');

		fwrite($socket, base64_encode($pun_config['o_smtp_pass'])."\r\n");

		server_parse($socket, '235');

	}

	else

	{

		fwrite($socket, 'HELO '.$smtp_host."\r\n");

		server_parse($socket, '250');

	}

	fwrite($socket, 'MAIL FROM: <'.$pun_config['o_webmaster_email'].'>'."\r\n");

	server_parse($socket, '250');

	$to_header = 'To: ';

	@reset($recipients);

	while (list(, $email) = @each($recipients))

	{

		fwrite($socket, 'RCPT TO: <'.$email.'>'."\r\n");

		server_parse($socket, '250');

		$to_header .= '<'.$email.'>, ';

	}

	fwrite($socket, 'DATA'."\r\n");

	server_parse($socket, '354');

	fwrite($socket, 'Subject: '.$subject."\r\n".$to_header."\r\n".$headers."\r\n\r\n".$message."\r\n");

	fwrite($socket, '.'."\r\n");

	server_parse($socket, '250');

	fwrite($socket, 'QUIT'."\r\n");

	fclose($socket);

	return true;

}