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<?php
/*
+-----------------------------------------------------------------------+
| This file is part of the Roundcube Webmail client |
| Copyright (C) 2005-2012, The Roundcube Dev Team |
| |
| Licensed under the GNU General Public License version 3 or |
| any later version with exceptions for skins & plugins. |
| See the README file for a full license statement. |
| |
| PURPOSE: |
| Provide SMTP functionality using socket connections |
+-----------------------------------------------------------------------+
| Author: Thomas Bruederli <roundcube@gmail.com> |
+-----------------------------------------------------------------------+
*/
/**
* Class to provide SMTP functionality using PEAR Net_SMTP
*
* @package Framework
* @subpackage Mail
* @author Thomas Bruederli <roundcube@gmail.com>
* @author Aleksander Machniak <alec@alec.pl>
*/
class rcube_smtp
{
private $conn = null;
private $response;
private $error;
// define headers delimiter
const SMTP_MIME_CRLF = "\r\n";
const DEBUG_LINE_LENGTH = 4098; // 4KB + 2B for \r\n
/**
* SMTP Connection and authentication
*
* @param string Server host
* @param string Server port
* @param string User name
* @param string Password
*
* @return bool Returns true on success, or false on error
*/
public function connect($host=null, $port=null, $user=null, $pass=null)
{
$rcube = rcube::get_instance();
// disconnect/destroy $this->conn
$this->disconnect();
// reset error/response var
$this->error = $this->response = null;
// let plugins alter smtp connection config
$CONFIG = $rcube->plugins->exec_hook('smtp_connect', array(
'smtp_server' => $host ? $host : $rcube->config->get('smtp_server'),
'smtp_port' => $port ? $port : $rcube->config->get('smtp_port', 25),
'smtp_user' => $user ? $user : $rcube->config->get('smtp_user'),
'smtp_pass' => $pass ? $pass : $rcube->config->get('smtp_pass'),
'smtp_auth_cid' => $rcube->config->get('smtp_auth_cid'),
'smtp_auth_pw' => $rcube->config->get('smtp_auth_pw'),
'smtp_auth_type' => $rcube->config->get('smtp_auth_type'),
'smtp_helo_host' => $rcube->config->get('smtp_helo_host'),
'smtp_timeout' => $rcube->config->get('smtp_timeout'),
'smtp_conn_options' => $rcube->config->get('smtp_conn_options'),
'smtp_auth_callbacks' => array(),
));
$smtp_host = rcube_utils::parse_host($CONFIG['smtp_server']);
// when called from Installer it's possible to have empty $smtp_host here
if (!$smtp_host) $smtp_host = 'localhost';
$smtp_port = is_numeric($CONFIG['smtp_port']) ? $CONFIG['smtp_port'] : 25;
$smtp_host_url = parse_url($smtp_host);
// overwrite port
if (isset($smtp_host_url['host']) && isset($smtp_host_url['port'])) {
$smtp_host = $smtp_host_url['host'];
$smtp_port = $smtp_host_url['port'];
}
// re-write smtp host
if (isset($smtp_host_url['host']) && isset($smtp_host_url['scheme'])) {
$smtp_host = sprintf('%s://%s', $smtp_host_url['scheme'], $smtp_host_url['host']);
}
// remove TLS prefix and set flag for use in Net_SMTP::auth()
if (preg_match('#^tls://#i', $smtp_host)) {
$smtp_host = preg_replace('#^tls://#i', '', $smtp_host);
$use_tls = true;
}
if (!empty($CONFIG['smtp_helo_host'])) {
$helo_host = $CONFIG['smtp_helo_host'];
}
else if (!empty($_SERVER['SERVER_NAME'])) {
$helo_host = preg_replace('/:\d+$/', '', $_SERVER['SERVER_NAME']);
}
else {
$helo_host = 'localhost';
}
// IDNA Support
$smtp_host = rcube_utils::idn_to_ascii($smtp_host);
$this->conn = new Net_SMTP($smtp_host, $smtp_port, $helo_host, false, 0, $CONFIG['smtp_conn_options']);
if ($rcube->config->get('smtp_debug')) {
$this->conn->setDebug(true, array($this, 'debug_handler'));
}
// register authentication methods
if (!empty($CONFIG['smtp_auth_callbacks']) && method_exists($this->conn, 'setAuthMethod')) {
foreach ($CONFIG['smtp_auth_callbacks'] as $callback) {
$this->conn->setAuthMethod($callback['name'], $callback['function'],
isset($callback['prepend']) ? $callback['prepend'] : true);
}
}
// try to connect to server and exit on failure
$result = $this->conn->connect($CONFIG['smtp_timeout']);
if (PEAR::isError($result)) {
$this->response[] = "Connection failed: ".$result->getMessage();
$this->error = array('label' => 'smtpconnerror', 'vars' => array('code' => $this->conn->_code));
$this->conn = null;
return false;
}
// workaround for timeout bug in Net_SMTP 1.5.[0-1] (#1487843)
if (method_exists($this->conn, 'setTimeout')
&& ($timeout = ini_get('default_socket_timeout'))
) {
$this->conn->setTimeout($timeout);
}
$smtp_user = str_replace('%u', $rcube->get_user_name(), $CONFIG['smtp_user']);
$smtp_pass = str_replace('%p', $rcube->get_user_password(), $CONFIG['smtp_pass']);
$smtp_auth_type = empty($CONFIG['smtp_auth_type']) ? NULL : $CONFIG['smtp_auth_type'];
if (!empty($CONFIG['smtp_auth_cid'])) {
$smtp_authz = $smtp_user;
$smtp_user = $CONFIG['smtp_auth_cid'];
$smtp_pass = $CONFIG['smtp_auth_pw'];
}
// attempt to authenticate to the SMTP server
if ($smtp_user && $smtp_pass) {
// IDNA Support
if (strpos($smtp_user, '@')) {
$smtp_user = rcube_utils::idn_to_ascii($smtp_user);
}
$result = $this->conn->auth($smtp_user, $smtp_pass, $smtp_auth_type, $use_tls, $smtp_authz);
if (PEAR::isError($result)) {
$this->error = array('label' => 'smtpautherror', 'vars' => array('code' => $this->conn->_code));
$this->response[] .= 'Authentication failure: ' . $result->getMessage() . ' (Code: ' . $result->getCode() . ')';
$this->reset();
$this->disconnect();
return false;
}
}
return true;
}
/**
* Function for sending mail
*
* @param string Sender e-Mail address
*
* @param mixed Either a comma-seperated list of recipients
* (RFC822 compliant), or an array of recipients,
* each RFC822 valid. This may contain recipients not
* specified in the headers, for Bcc:, resending
* messages, etc.
* @param mixed The message headers to send with the mail
* Either as an associative array or a finally
* formatted string
* @param mixed The full text of the message body, including any Mime parts
* or file handle
* @param array Delivery options (e.g. DSN request)
*
* @return bool Returns true on success, or false on error
*/
public function send_mail($from, $recipients, &$headers, &$body, $opts=null)
{
if (!is_object($this->conn)) {
return false;
}
// prepare message headers as string
if (is_array($headers)) {
if (!($headerElements = $this->_prepare_headers($headers))) {
$this->reset();
return false;
}
list($from, $text_headers) = $headerElements;
}
else if (is_string($headers)) {
$text_headers = $headers;
}
else {
$this->reset();
$this->response[] = "Invalid message headers";
return false;
}
// exit if no from address is given
if (!isset($from)) {
$this->reset();
$this->response[] = "No From address has been provided";
return false;
}
// RFC3461: Delivery Status Notification
if ($opts['dsn']) {
$exts = $this->conn->getServiceExtensions();
if (isset($exts['DSN'])) {
$from_params = 'RET=HDRS';
$recipient_params = 'NOTIFY=SUCCESS,FAILURE';
}
}
// RFC2298.3: remove envelope sender address
if (empty($opts['mdn_use_from'])
&& preg_match('/Content-Type: multipart\/report/', $text_headers)
&& preg_match('/report-type=disposition-notification/', $text_headers)
) {
$from = '';
}
// set From: address
if (PEAR::isError($this->conn->mailFrom($from, $from_params))) {
$err = $this->conn->getResponse();
$this->error = array('label' => 'smtpfromerror', 'vars' => array(
'from' => $from, 'code' => $this->conn->_code, 'msg' => $err[1]));
$this->response[] = "Failed to set sender '$from'";
$this->reset();
return false;
}
// prepare list of recipients
$recipients = $this->_parse_rfc822($recipients);
if (PEAR::isError($recipients)) {
$this->error = array('label' => 'smtprecipientserror');
$this->reset();
return false;
}
// set mail recipients
foreach ($recipients as $recipient) {
if (PEAR::isError($this->conn->rcptTo($recipient, $recipient_params))) {
$err = $this->conn->getResponse();
$this->error = array('label' => 'smtptoerror', 'vars' => array(
'to' => $recipient, 'code' => $this->conn->_code, 'msg' => $err[1]));
$this->response[] = "Failed to add recipient '$recipient'";
$this->reset();
return false;
}
}
if (is_resource($body)) {
// file handle
$data = $body;
$text_headers = preg_replace('/[\r\n]+$/', '', $text_headers);
}
else {
// Concatenate headers and body so it can be passed by reference to SMTP_CONN->data
// so preg_replace in SMTP_CONN->quotedata will store a reference instead of a copy.
// We are still forced to make another copy here for a couple ticks so we don't really
// get to save a copy in the method call.
$data = $text_headers . "\r\n" . $body;
// unset old vars to save data and so we can pass into SMTP_CONN->data by reference.
unset($text_headers, $body);
}
// Send the message's headers and the body as SMTP data.
if (PEAR::isError($result = $this->conn->data($data, $text_headers))) {
$err = $this->conn->getResponse();
if (!in_array($err[0], array(354, 250, 221))) {
$msg = sprintf('[%d] %s', $err[0], $err[1]);
}
else {
$msg = $result->getMessage();
}
$this->error = array('label' => 'smtperror', 'vars' => array('msg' => $msg));
$this->response[] = "Failed to send data";
$this->reset();
return false;
}
$this->response[] = join(': ', $this->conn->getResponse());
return true;
}
/**
* Reset the global SMTP connection
*/
public function reset()
{
if (is_object($this->conn)) {
$this->conn->rset();
}
}
/**
* Disconnect the global SMTP connection
*/
public function disconnect()
{
if (is_object($this->conn)) {
$this->conn->disconnect();
$this->conn = null;
}
}
/**
* This is our own debug handler for the SMTP connection
*/
public function debug_handler(&$smtp, $message)
{
if (($len = strlen($message)) > self::DEBUG_LINE_LENGTH) {
$diff = $len - self::DEBUG_LINE_LENGTH;
$message = substr($message, 0, self::DEBUG_LINE_LENGTH)
. "... [truncated $diff bytes]";
}
rcube::write_log('smtp', preg_replace('/\r\n$/', '', $message));
}
/**
* Get error message
*/
public function get_error()
{
return $this->error;
}
/**
* Get server response messages array
*/
public function get_response()
{
return $this->response;
}
/**
* Take an array of mail headers and return a string containing
* text usable in sending a message.
*
* @param array $headers The array of headers to prepare, in an associative
* array, where the array key is the header name (ie,
* 'Subject'), and the array value is the header
* value (ie, 'test'). The header produced from those
* values would be 'Subject: test'.
*
* @return mixed Returns false if it encounters a bad address,
* otherwise returns an array containing two
* elements: Any From: address found in the headers,
* and the plain text version of the headers.
*/
private function _prepare_headers($headers)
{
$lines = array();
$from = null;
foreach ($headers as $key => $value) {
if (strcasecmp($key, 'From') === 0) {
$addresses = $this->_parse_rfc822($value);
if (is_array($addresses)) {
$from = $addresses[0];
}
// Reject envelope From: addresses with spaces.
if (strpos($from, ' ') !== false) {
return false;
}
$lines[] = $key . ': ' . $value;
}
else if (strcasecmp($key, 'Received') === 0) {
$received = array();
if (is_array($value)) {
foreach ($value as $line) {
$received[] = $key . ': ' . $line;
}
}
else {
$received[] = $key . ': ' . $value;
}
// Put Received: headers at the top. Spam detectors often
// flag messages with Received: headers after the Subject:
// as spam.
$lines = array_merge($received, $lines);
}
else {
// If $value is an array (i.e., a list of addresses), convert
// it to a comma-delimited string of its elements (addresses).
if (is_array($value)) {
$value = implode(', ', $value);
}
$lines[] = $key . ': ' . $value;
}
}
return array($from, join(self::SMTP_MIME_CRLF, $lines) . self::SMTP_MIME_CRLF);
}
/**
* Take a set of recipients and parse them, returning an array of
* bare addresses (forward paths) that can be passed to sendmail
* or an smtp server with the rcpt to: command.
*
* @param mixed Either a comma-seperated list of recipients
* (RFC822 compliant), or an array of recipients,
* each RFC822 valid.
*
* @return array An array of forward paths (bare addresses).
*/
private function _parse_rfc822($recipients)
{
// if we're passed an array, assume addresses are valid and implode them before parsing.
if (is_array($recipients)) {
$recipients = implode(', ', $recipients);
}
$addresses = array();
$recipients = rcube_utils::explode_quoted_string(',', $recipients);
reset($recipients);
foreach ($recipients as $recipient) {
$a = rcube_utils::explode_quoted_string(' ', $recipient);
foreach ($a as $word) {
if (strpos($word, "@") > 0 && $word[strlen($word)-1] != '"') {
$word = preg_replace('/^<|>$/', '', trim($word));
if (in_array($word, $addresses) === false) {
array_push($addresses, $word);
}
}
}
}
return $addresses;
}
}
