<?php

if (!defined('BB_ROOT')) die(basename(__FILE__));

define('SMTP_INCLUDED', 1);

function server_parse($socket, $response, $line = __LINE__)
{
	$server_response = '';
	while (substr($server_response, 3, 1) != ' ')
	{
		if (!($server_response = fgets($socket, 256)))
		{
			bb_die('Could not get mail server response codes');
		}
	}

	if (!(substr($server_response, 0, 3) == $response))
	{
		bb_die('Ran into problems sending mail. Response: '. $server_response);
	}
}

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

	// Fix $mail_to format (Adding missing ">" at end) | https://torrentpier.com/threads/otpravka-pisem-cherez-smtp.41135/page-4#post-85044
	if (preg_match('%<(.+)>%smi', $mail_to, $regs))
	{
		$mail_to = $regs[1];
	}

	// 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 = $cc = $bcc = '';
		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) == '')
	{
		bb_die('No email subject specified');
	}

	if (trim($message) == '')
	{
		bb_die('Email message was blank');
	}

	// Ok we have error checked as much as we can to this point let's get on it already
	if ($bb_cfg['smtp_type'] == 'ssl')
	{
		$ssl = 'ssl://';
	}
	elseif ($bb_cfg['smtp_type'] == 'tls')
	{
		$ssl = 'tcp://';
	}
	else
	{
		$ssl = '';
	}
	$context = stream_context_create(array(
		'ssl' => array(
			'verify_peer' => $bb_cfg['smtp_cert_verify'],
			'verify_peer_name' => $bb_cfg['smtp_cert_verify']
		)
	));
	if( !$socket = @stream_socket_client($ssl . $bb_cfg['smtp_host'] . ':' . $bb_cfg['smtp_port'], $errno, $errstr, ini_get("default_socket_timeout"), STREAM_CLIENT_CONNECT, $context) )
	{
		bb_die('Could not connect to smtp host : '. $errno .' : '. $errstr);
	}
	unset($context);

	// 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($bb_cfg['smtp_username']) && !empty($bb_cfg['smtp_password']) )
	{
		fputs($socket, "EHLO " . $bb_cfg['smtp_host'] . "\r\n");
		server_parse($socket, "250", __LINE__);

		// tls support
		if ($bb_cfg['smtp_type'] == 'tls')
		{
			fputs($socket, "STARTTLS\r\n");
			server_parse($socket, "220", __LINE__);
			stream_socket_enable_crypto($socket, true, STREAM_CRYPTO_METHOD_ANY_CLIENT);
			fputs($socket, "EHLO " . $bb_cfg['smtp_host'] . "\r\n");
			server_parse($socket, "250", __LINE__);
		}

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

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

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

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

	// 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;
}