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Sieve.php
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<?php
/**
* This file contains the Net_Sieve class.
*
* PHP version 4
*
* +-----------------------------------------------------------------------+
* | All rights reserved. |
* | |
* | Redistribution and use in source and binary forms, with or without |
* | modification, are permitted provided that the following conditions |
* | are met: |
* | |
* | o Redistributions of source code must retain the above copyright |
* | notice, this list of conditions and the following disclaimer. |
* | o Redistributions in binary form must reproduce the above copyright |
* | notice, this list of conditions and the following disclaimer in the |
* | documentation and/or other materials provided with the distribution.|
* | |
* | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
* | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
* | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
* | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
* | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
* | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
* | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
* | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
* | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
* | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
* | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
* +-----------------------------------------------------------------------+
*
* @category Networking
* @package Net_Sieve
* @author Richard Heyes <richard@phpguru.org>
* @author Damian Fernandez Sosa <damlists@cnba.uba.ar>
* @author Anish Mistry <amistry@am-productions.biz>
* @author Jan Schneider <jan@horde.org>
* @copyright 2002-2003 Richard Heyes
* @copyright 2006-2008 Anish Mistry
* @license http://www.opensource.org/licenses/bsd-license.php BSD
* @version SVN: $Id$
* @link http://pear.php.net/package/Net_Sieve
*/
require_once 'PEAR.php';
require_once 'Net/Socket.php';
/**
* TODO
*
* o supportsAuthMech()
*/
/**
* Disconnected state
* @const NET_SIEVE_STATE_DISCONNECTED
*/
define('NET_SIEVE_STATE_DISCONNECTED', 1, true);
/**
* Authorisation state
* @const NET_SIEVE_STATE_AUTHORISATION
*/
define('NET_SIEVE_STATE_AUTHORISATION', 2, true);
/**
* Transaction state
* @const NET_SIEVE_STATE_TRANSACTION
*/
define('NET_SIEVE_STATE_TRANSACTION', 3, true);
/**
* A class for talking to the timsieved server which comes with Cyrus IMAP.
*
* @category Networking
* @package Net_Sieve
* @author Richard Heyes <richard@phpguru.org>
* @author Damian Fernandez Sosa <damlists@cnba.uba.ar>
* @author Anish Mistry <amistry@am-productions.biz>
* @author Jan Schneider <jan@horde.org>
* @copyright 2002-2003 Richard Heyes
* @copyright 2006-2008 Anish Mistry
* @license http://www.opensource.org/licenses/bsd-license.php BSD
* @version Release: 1.3.2
* @link http://pear.php.net/package/Net_Sieve
* @link http://tools.ietf.org/html/rfc5228 RFC 5228 (Sieve: An Email
* Filtering Language)
* @link http://tools.ietf.org/html/rfc5804 RFC 5804 A Protocol for
* Remotely Managing Sieve Scripts
*/
class Net_Sieve
{
/**
* The authentication methods this class supports.
*
* Can be overwritten if having problems with certain methods.
*
* @var array
*/
var $supportedAuthMethods = array('DIGEST-MD5', 'CRAM-MD5', 'EXTERNAL',
'PLAIN' , 'LOGIN');
/**
* SASL authentication methods that require Auth_SASL.
*
* @var array
*/
var $supportedSASLAuthMethods = array('DIGEST-MD5', 'CRAM-MD5');
/**
* The socket handle.
*
* @var resource
*/
var $_sock;
/**
* Parameters and connection information.
*
* @var array
*/
var $_data;
/**
* Current state of the connection.
*
* One of the NET_SIEVE_STATE_* constants.
*
* @var integer
*/
var $_state;
/**
* Constructor error.
*
* @var PEAR_Error
*/
var $_error;
/**
* Whether to enable debugging.
*
* @var boolean
*/
var $_debug = false;
/**
* Debug output handler.
*
* This has to be a valid callback.
*
* @var string|array
*/
var $_debug_handler = null;
/**
* Whether to pick up an already established connection.
*
* @var boolean
*/
var $_bypassAuth = false;
/**
* Whether to use TLS if available.
*
* @var boolean
*/
var $_useTLS = true;
/**
* Additional options for stream_context_create().
*
* @var array
*/
var $_options = null;
/**
* Maximum number of referral loops
*
* @var array
*/
var $_maxReferralCount = 15;
/**
* Constructor.
*
* Sets up the object, connects to the server and logs in. Stores any
* generated error in $this->_error, which can be retrieved using the
* getError() method.
*
* @param string $user Login username.
* @param string $pass Login password.
* @param string $host Hostname of server.
* @param string $port Port of server.
* @param string $logintype Type of login to perform (see
* $supportedAuthMethods).
* @param string $euser Effective user. If authenticating as an
* administrator, login as this user.
* @param boolean $debug Whether to enable debugging (@see setDebug()).
* @param string $bypassAuth Skip the authentication phase. Useful if the
* socket is already open.
* @param boolean $useTLS Use TLS if available.
* @param array $options Additional options for
* stream_context_create().
* @param mixed $handler A callback handler for the debug output.
*/
function Net_Sieve($user = null, $pass = null, $host = 'localhost',
$port = 2000, $logintype = '', $euser = '',
$debug = false, $bypassAuth = false, $useTLS = true,
$options = null, $handler = null)
{
$this->_state = NET_SIEVE_STATE_DISCONNECTED;
$this->_data['user'] = $user;
$this->_data['pass'] = $pass;
$this->_data['host'] = $host;
$this->_data['port'] = $port;
$this->_data['logintype'] = $logintype;
$this->_data['euser'] = $euser;
$this->_sock = new Net_Socket();
$this->_bypassAuth = $bypassAuth;
$this->_useTLS = $useTLS;
$this->_options = $options;
$this->setDebug($debug, $handler);
/* Try to include the Auth_SASL package. If the package is not
* available, we disable the authentication methods that depend upon
* it. */
if ((@include_once 'Auth/SASL.php') === false) {
$this->_debug('Auth_SASL not present');
foreach ($this->supportedSASLAuthMethods as $SASLMethod) {
$pos = array_search($SASLMethod, $this->supportedAuthMethods);
$this->_debug('Disabling method ' . $SASLMethod);
unset($this->supportedAuthMethods[$pos]);
}
}
if (strlen($user) && strlen($pass)) {
$this->_error = $this->_handleConnectAndLogin();
}
}
/**
* Returns any error that may have been generated in the constructor.
*
* @return boolean|PEAR_Error False if no error, PEAR_Error otherwise.
*/
function getError()
{
return PEAR::isError($this->_error) ? $this->_error : false;
}
/**
* Sets the debug state and handler function.
*
* @param boolean $debug Whether to enable debugging.
* @param string $handler A custom debug handler. Must be a valid callback.
*
* @return void
*/
function setDebug($debug = true, $handler = null)
{
$this->_debug = $debug;
$this->_debug_handler = $handler;
}
/**
* Connects to the server and logs in.
*
* @return boolean True on success, PEAR_Error on failure.
*/
function _handleConnectAndLogin()
{
if (PEAR::isError($res = $this->connect($this->_data['host'], $this->_data['port'], $this->_options, $this->_useTLS))) {
return $res;
}
if ($this->_bypassAuth === false) {
if (PEAR::isError($res = $this->login($this->_data['user'], $this->_data['pass'], $this->_data['logintype'], $this->_data['euser'], $this->_bypassAuth))) {
return $res;
}
}
return true;
}
/**
* Handles connecting to the server and checks the response validity.
*
* @param string $host Hostname of server.
* @param string $port Port of server.
* @param array $options List of options to pass to
* stream_context_create().
* @param boolean $useTLS Use TLS if available.
*
* @return boolean True on success, PEAR_Error otherwise.
*/
function connect($host, $port, $options = null, $useTLS = true)
{
$this->_data['host'] = $host;
$this->_data['port'] = $port;
$this->_useTLS = $useTLS;
if (is_array($options)) {
$this->_options = array_merge($this->_options, $options);
}
if (NET_SIEVE_STATE_DISCONNECTED != $this->_state) {
return PEAR::raiseError('Not currently in DISCONNECTED state', 1);
}
if (PEAR::isError($res = $this->_sock->connect($host, $port, false, 5, $options))) {
return $res;
}
if ($this->_bypassAuth) {
$this->_state = NET_SIEVE_STATE_TRANSACTION;
} else {
$this->_state = NET_SIEVE_STATE_AUTHORISATION;
if (PEAR::isError($res = $this->_doCmd())) {
return $res;
}
}
// Explicitly ask for the capabilities in case the connection is
// picked up from an existing connection.
if (PEAR::isError($res = $this->_cmdCapability())) {
return PEAR::raiseError(
'Failed to connect, server said: ' . $res->getMessage(), 2
);
}
// Check if we can enable TLS via STARTTLS.
if ($useTLS && !empty($this->_capability['starttls'])
&& function_exists('stream_socket_enable_crypto')
) {
if (PEAR::isError($res = $this->_startTLS())) {
return $res;
}
}
return true;
}
/**
* Disconnect from the Sieve server.
*
* @param boolean $sendLogoutCMD Whether to send LOGOUT command before
* disconnecting.
*
* @return boolean True on success, PEAR_Error otherwise.
*/
function disconnect($sendLogoutCMD = true)
{
return $this->_cmdLogout($sendLogoutCMD);
}
/**
* Logs into server.
*
* @param string $user Login username.
* @param string $pass Login password.
* @param string $logintype Type of login method to use.
* @param string $euser Effective UID (perform on behalf of $euser).
* @param boolean $bypassAuth Do not perform authentication.
*
* @return boolean True on success, PEAR_Error otherwise.
*/
function login($user, $pass, $logintype = null, $euser = '', $bypassAuth = false)
{
$this->_data['user'] = $user;
$this->_data['pass'] = $pass;
$this->_data['logintype'] = $logintype;
$this->_data['euser'] = $euser;
$this->_bypassAuth = $bypassAuth;
if (NET_SIEVE_STATE_AUTHORISATION != $this->_state) {
return PEAR::raiseError('Not currently in AUTHORISATION state', 1);
}
if (!$bypassAuth ) {
if (PEAR::isError($res = $this->_cmdAuthenticate($user, $pass, $logintype, $euser))) {
return $res;
}
}
$this->_state = NET_SIEVE_STATE_TRANSACTION;
return true;
}
/**
* Returns an indexed array of scripts currently on the server.
*
* @return array Indexed array of scriptnames.
*/
function listScripts()
{
if (is_array($scripts = $this->_cmdListScripts())) {
$this->_active = $scripts[1];
return $scripts[0];
} else {
return $scripts;
}
}
/**
* Returns the active script.
*
* @return string The active scriptname.
*/
function getActive()
{
if (!empty($this->_active)) {
return $this->_active;
}
if (is_array($scripts = $this->_cmdListScripts())) {
$this->_active = $scripts[1];
return $scripts[1];
}
}
/**
* Sets the active script.
*
* @param string $scriptname The name of the script to be set as active.
*
* @return boolean True on success, PEAR_Error on failure.
*/
function setActive($scriptname)
{
return $this->_cmdSetActive($scriptname);
}
/**
* Retrieves a script.
*
* @param string $scriptname The name of the script to be retrieved.
*
* @return string The script on success, PEAR_Error on failure.
*/
function getScript($scriptname)
{
return $this->_cmdGetScript($scriptname);
}
/**
* Adds a script to the server.
*
* @param string $scriptname Name of the script.
* @param string $script The script content.
* @param boolean $makeactive Whether to make this the active script.
*
* @return boolean True on success, PEAR_Error on failure.
*/
function installScript($scriptname, $script, $makeactive = false)
{
if (PEAR::isError($res = $this->_cmdPutScript($scriptname, $script))) {
return $res;
}
if ($makeactive) {
return $this->_cmdSetActive($scriptname);
}
return true;
}
/**
* Removes a script from the server.
*
* @param string $scriptname Name of the script.
*
* @return boolean True on success, PEAR_Error on failure.
*/
function removeScript($scriptname)
{
return $this->_cmdDeleteScript($scriptname);
}
/**
* Checks if the server has space to store the script by the server.
*
* @param string $scriptname The name of the script to mark as active.
* @param integer $size The size of the script.
*
* @return boolean|PEAR_Error True if there is space, PEAR_Error otherwise.
*
* @todo Rename to hasSpace()
*/
function haveSpace($scriptname, $size)
{
if (NET_SIEVE_STATE_TRANSACTION != $this->_state) {
return PEAR::raiseError('Not currently in TRANSACTION state', 1);
}
if (PEAR::isError($res = $this->_doCmd(sprintf('HAVESPACE %s %d', $this->_escape($scriptname), $size)))) {
return $res;
}
return true;
}
/**
* Returns the list of extensions the server supports.
*
* @return array List of extensions or PEAR_Error on failure.
*/
function getExtensions()
{
if (NET_SIEVE_STATE_DISCONNECTED == $this->_state) {
return PEAR::raiseError('Not currently connected', 7);
}
return $this->_capability['extensions'];
}
/**
* Returns whether the server supports an extension.
*
* @param string $extension The extension to check.
*
* @return boolean Whether the extension is supported or PEAR_Error on
* failure.
*/
function hasExtension($extension)
{
if (NET_SIEVE_STATE_DISCONNECTED == $this->_state) {
return PEAR::raiseError('Not currently connected', 7);
}
$extension = trim($this->_toUpper($extension));
if (is_array($this->_capability['extensions'])) {
foreach ($this->_capability['extensions'] as $ext) {
if ($ext == $extension) {
return true;
}
}
}
return false;
}
/**
* Returns the list of authentication methods the server supports.
*
* @return array List of authentication methods or PEAR_Error on failure.
*/
function getAuthMechs()
{
if (NET_SIEVE_STATE_DISCONNECTED == $this->_state) {
return PEAR::raiseError('Not currently connected', 7);
}
return $this->_capability['sasl'];
}
/**
* Returns whether the server supports an authentication method.
*
* @param string $method The method to check.
*
* @return boolean Whether the method is supported or PEAR_Error on
* failure.
*/
function hasAuthMech($method)
{
if (NET_SIEVE_STATE_DISCONNECTED == $this->_state) {
return PEAR::raiseError('Not currently connected', 7);
}
$method = trim($this->_toUpper($method));
if (is_array($this->_capability['sasl'])) {
foreach ($this->_capability['sasl'] as $sasl) {
if ($sasl == $method) {
return true;
}
}
}
return false;
}
/**
* Handles the authentication using any known method.
*
* @param string $uid The userid to authenticate as.
* @param string $pwd The password to authenticate with.
* @param string $userMethod The method to use. If empty, the class chooses
* the best (strongest) available method.
* @param string $euser The effective uid to authenticate as.
*
* @return void
*/
function _cmdAuthenticate($uid, $pwd, $userMethod = null, $euser = '')
{
if (PEAR::isError($method = $this->_getBestAuthMethod($userMethod))) {
return $method;
}
switch ($method) {
case 'DIGEST-MD5':
return $this->_authDigestMD5($uid, $pwd, $euser);
case 'CRAM-MD5':
$result = $this->_authCRAMMD5($uid, $pwd, $euser);
break;
case 'LOGIN':
$result = $this->_authLOGIN($uid, $pwd, $euser);
break;
case 'PLAIN':
$result = $this->_authPLAIN($uid, $pwd, $euser);
break;
case 'EXTERNAL':
$result = $this->_authEXTERNAL($uid, $pwd, $euser);
break;
default :
$result = PEAR::raiseError(
$method . ' is not a supported authentication method'
);
break;
}
if (PEAR::isError($res = $this->_doCmd())) {
return $res;
}
// Query the server capabilities again now that we are authenticated.
if (PEAR::isError($res = $this->_cmdCapability())) {
return PEAR::raiseError(
'Failed to connect, server said: ' . $res->getMessage(), 2
);
}
return $result;
}
/**
* Authenticates the user using the PLAIN method.
*
* @param string $user The userid to authenticate as.
* @param string $pass The password to authenticate with.
* @param string $euser The effective uid to authenticate as.
*
* @return void
*/
function _authPLAIN($user, $pass, $euser)
{
return $this->_sendCmd(
sprintf(
'AUTHENTICATE "PLAIN" "%s"',
base64_encode($euser . chr(0) . $user . chr(0) . $pass)
)
);
}
/**
* Authenticates the user using the LOGIN method.
*
* @param string $user The userid to authenticate as.
* @param string $pass The password to authenticate with.
* @param string $euser The effective uid to authenticate as.
*
* @return void
*/
function _authLOGIN($user, $pass, $euser)
{
if (PEAR::isError($result = $this->_sendCmd('AUTHENTICATE "LOGIN"'))) {
return $result;
}
if (PEAR::isError($result = $this->_doCmd('"' . base64_encode($user) . '"', true))) {
return $result;
}
return $this->_doCmd('"' . base64_encode($pass) . '"', true);
}
/**
* Authenticates the user using the CRAM-MD5 method.
*
* @param string $user The userid to authenticate as.
* @param string $pass The password to authenticate with.
* @param string $euser The effective uid to authenticate as.
*
* @return void
*/
function _authCRAMMD5($user, $pass, $euser)
{
if (PEAR::isError($challenge = $this->_doCmd('AUTHENTICATE "CRAM-MD5"', true))) {
return $challenge;
}
$challenge = base64_decode(trim($challenge));
$cram = Auth_SASL::factory('crammd5');
if (PEAR::isError($response = $cram->getResponse($user, $pass, $challenge))) {
return $response;
}
return $this->_sendStringResponse(base64_encode($response));
}
/**
* Authenticates the user using the DIGEST-MD5 method.
*
* @param string $user The userid to authenticate as.
* @param string $pass The password to authenticate with.
* @param string $euser The effective uid to authenticate as.
*
* @return void
*/
function _authDigestMD5($user, $pass, $euser)
{
if (PEAR::isError($challenge = $this->_doCmd('AUTHENTICATE "DIGEST-MD5"', true))) {
return $challenge;
}
$challenge = base64_decode(trim($challenge));
$digest = Auth_SASL::factory('digestmd5');
// @todo Really 'localhost'?
if (PEAR::isError($response = $digest->getResponse($user, $pass, $challenge, 'localhost', 'sieve', $euser))) {
return $response;
}
if (PEAR::isError($result = $this->_sendStringResponse(base64_encode($response)))) {
return $result;
}
if (PEAR::isError($result = $this->_doCmd('', true))) {
return $result;
}
if ($this->_toUpper(substr($result, 0, 2)) == 'OK') {
return;
}
/* We don't use the protocol's third step because SIEVE doesn't allow
* subsequent authentication, so we just silently ignore it. */
if (PEAR::isError($result = $this->_sendStringResponse(''))) {
return $result;
}
return $this->_doCmd();
}
/**
* Authenticates the user using the EXTERNAL method.
*
* @param string $user The userid to authenticate as.
* @param string $pass The password to authenticate with.
* @param string $euser The effective uid to authenticate as.
*
* @return void
*
* @since 1.1.7
*/
function _authEXTERNAL($user, $pass, $euser)
{
$cmd = sprintf(
'AUTHENTICATE "EXTERNAL" "%s"',
base64_encode(strlen($euser) ? $euser : $user)
);
return $this->_sendCmd($cmd);
}
/**
* Removes a script from the server.
*
* @param string $scriptname Name of the script to delete.
*
* @return boolean True on success, PEAR_Error otherwise.
*/
function _cmdDeleteScript($scriptname)
{
if (NET_SIEVE_STATE_TRANSACTION != $this->_state) {
return PEAR::raiseError('Not currently in AUTHORISATION state', 1);
}
if (PEAR::isError($res = $this->_doCmd(sprintf('DELETESCRIPT %s', $this->_escape($scriptname))))) {
return $res;
}
return true;
}
/**
* Retrieves the contents of the named script.
*
* @param string $scriptname Name of the script to retrieve.
*
* @return string The script if successful, PEAR_Error otherwise.
*/
function _cmdGetScript($scriptname)
{
if (NET_SIEVE_STATE_TRANSACTION != $this->_state) {
return PEAR::raiseError('Not currently in AUTHORISATION state', 1);
}
if (PEAR::isError($res = $this->_doCmd(sprintf('GETSCRIPT %s', $this->_escape($scriptname))))) {
return $res;
}
return preg_replace('/^{[0-9]+}\r\n/', '', $res);
}
/**
* Sets the active script, i.e. the one that gets run on new mail by the
* server.
*
* @param string $scriptname The name of the script to mark as active.
*
* @return boolean True on success, PEAR_Error otherwise.
*/
function _cmdSetActive($scriptname)
{
if (NET_SIEVE_STATE_TRANSACTION != $this->_state) {
return PEAR::raiseError('Not currently in AUTHORISATION state', 1);
}
if (PEAR::isError($res = $this->_doCmd(sprintf('SETACTIVE %s', $this->_escape($scriptname))))) {
return $res;
}
$this->_activeScript = $scriptname;
return true;
}
/**
* Returns the list of scripts on the server.
*
* @return array An array with the list of scripts in the first element
* and the active script in the second element on success,
* PEAR_Error otherwise.
*/
function _cmdListScripts()
{
if (NET_SIEVE_STATE_TRANSACTION != $this->_state) {
return PEAR::raiseError('Not currently in AUTHORISATION state', 1);
}
if (PEAR::isError($res = $this->_doCmd('LISTSCRIPTS'))) {
return $res;
}
$scripts = array();
$activescript = null;
$res = explode("\r\n", $res);
foreach ($res as $value) {
if (preg_match('/^"(.*)"( ACTIVE)?$/i', $value, $matches)) {
$script_name = stripslashes($matches[1]);
$scripts[] = $script_name;
if (!empty($matches[2])) {
$activescript = $script_name;
}
}
}
return array($scripts, $activescript);
}
/**
* Adds a script to the server.
*
* @param string $scriptname Name of the new script.
* @param string $scriptdata The new script.
*
* @return boolean True on success, PEAR_Error otherwise.
*/
function _cmdPutScript($scriptname, $scriptdata)
{
if (NET_SIEVE_STATE_TRANSACTION != $this->_state) {
return PEAR::raiseError('Not currently in AUTHORISATION state', 1);
}
$stringLength = $this->_getLineLength($scriptdata);
$command = sprintf("PUTSCRIPT %s {%d+}\r\n%s",
$this->_escape($scriptname),
$stringLength,
$scriptdata);
if (PEAR::isError($res = $this->_doCmd($command))) {
return $res;
}
return true;
}
/**
* Logs out of the server and terminates the connection.
*
* @param boolean $sendLogoutCMD Whether to send LOGOUT command before
* disconnecting.
*
* @return boolean True on success, PEAR_Error otherwise.
*/
function _cmdLogout($sendLogoutCMD = true)
{
if (NET_SIEVE_STATE_DISCONNECTED == $this->_state) {
return PEAR::raiseError('Not currently connected', 1);
}
if ($sendLogoutCMD) {
if (PEAR::isError($res = $this->_doCmd('LOGOUT'))) {
return $res;
}
}
$this->_sock->disconnect();
$this->_state = NET_SIEVE_STATE_DISCONNECTED;
return true;
}
/**
* Sends the CAPABILITY command
*
* @return boolean True on success, PEAR_Error otherwise.
*/
function _cmdCapability()
{
if (NET_SIEVE_STATE_DISCONNECTED == $this->_state) {
return PEAR::raiseError('Not currently connected', 1);
}
if (PEAR::isError($res = $this->_doCmd('CAPABILITY'))) {
return $res;
}
$this->_parseCapability($res);
return true;
}
/**
* Parses the response from the CAPABILITY command and stores the result
* in $_capability.
*
* @param string $data The response from the capability command.
*
* @return void
*/
function _parseCapability($data)
{
// Clear the cached capabilities.
$this->_capability = array('sasl' => array(),
'extensions' => array());
$data = preg_split('/\r?\n/', $this->_toUpper($data), -1, PREG_SPLIT_NO_EMPTY);
for ($i = 0; $i < count($data); $i++) {
if (!preg_match('/^"([A-Z]+)"( "(.*)")?$/', $data[$i], $matches)) {
continue;
}
switch ($matches[1]) {
case 'IMPLEMENTATION':
$this->_capability['implementation'] = $matches[3];
break;
case 'SASL':
$this->_capability['sasl'] = preg_split('/\s+/', $matches[3]);
break;
case 'SIEVE':
$this->_capability['extensions'] = preg_split('/\s+/', $matches[3]);
break;
case 'STARTTLS':
$this->_capability['starttls'] = true;
break;
}
}
}
/**
* Sends a command to the server
*
* @param string $cmd The command to send.
*
* @return void
*/
function _sendCmd($cmd)
{
$status = $this->_sock->getStatus();
if (PEAR::isError($status) || $status['eof']) {
return PEAR::raiseError('Failed to write to socket: connection lost');
}
if (PEAR::isError($error = $this->_sock->write($cmd . "\r\n"))) {
return PEAR::raiseError(
'Failed to write to socket: ' . $error->getMessage()
);
}
$this->_debug("C: $cmd");
}
/**
* Sends a string response to the server.
*
* @param string $str The string to send.
*
* @return void
*/
function _sendStringResponse($str)
{
return $this->_sendCmd('{' . $this->_getLineLength($str) . "+}\r\n" . $str);
}
/**
* Receives a single line from the server.
*
* @return string The server response line.
*/
function _recvLn()
{
if (PEAR::isError($lastline = $this->_sock->gets(8192))) {
return PEAR::raiseError(
'Failed to read from socket: ' . $lastline->getMessage()
);
}
$lastline = rtrim($lastline);
$this->_debug("S: $lastline");
if ($lastline === '') {
return PEAR::raiseError('Failed to read from socket');
}
return $lastline;
}
/**
* Receives a number of bytes from the server.
*
* @param integer $length Number of bytes to read.
*
* @return string The server response.
*/
function _recvBytes($length)
{
$response = '';
$response_length = 0;
while ($response_length < $length) {
$response .= $this->_sock->read($length - $response_length);
$response_length = $this->_getLineLength($response);
}
$this->_debug('S: ' . rtrim($response));
return $response;
}
/**
* Send a command and retrieves a response from the server.
*
* @param string $cmd The command to send.
* @param boolean $auth Whether this is an authentication command.
*
* @return string|PEAR_Error Reponse string if an OK response, PEAR_Error
* if a NO response.
*/
function _doCmd($cmd = '', $auth = false)
{
$referralCount = 0;
while ($referralCount < $this->_maxReferralCount) {
if (strlen($cmd)) {
if (PEAR::isError($error = $this->_sendCmd($cmd))) {
return $error;
}
}
$response = '';
while (true) {
if (PEAR::isError($line = $this->_recvLn())) {
return $line;
}
$uc_line = $this->_toUpper($line);
if ('OK' == substr($uc_line, 0, 2)) {
$response .= $line;
return rtrim($response);
}
if ('NO' == substr($uc_line, 0, 2)) {
// Check for string literal error message.
if (preg_match('/{([0-9]+)}$/', $line, $matches)) {
$line = substr($line, 0, -(strlen($matches[1])+2))
. str_replace(
"\r\n", ' ', $this->_recvBytes($matches[1] + 2)
);
}
return PEAR::raiseError(trim($response . substr($line, 2)), 3);
}
if ('BYE' == substr($uc_line, 0, 3)) {
if (PEAR::isError($error = $this->disconnect(false))) {
return PEAR::raiseError(
'Cannot handle BYE, the error was: '
. $error->getMessage(),
4
);
}
// Check for referral, then follow it. Otherwise, carp an
// error.
if (preg_match('/^bye \(referral "(sieve:\/\/)?([^"]+)/i', $line, $matches)) {
// Replace the old host with the referral host
// preserving any protocol prefix.
$this->_data['host'] = preg_replace(
'/\w+(?!(\w|\:\/\/)).*/', $matches[2],
$this->_data['host']
);
if (PEAR::isError($error = $this->_handleConnectAndLogin())) {
return PEAR::raiseError(
'Cannot follow referral to '
. $this->_data['host'] . ', the error was: '
. $error->getMessage(),
5
);
}
break;
}
return PEAR::raiseError(trim($response . $line), 6);
}
if (preg_match('/^{([0-9]+)}/', $line, $matches)) {
// Matches literal string responses.
$line = $this->_recvBytes($matches[1] + 2);
if (!$auth) {
// Receive the pending OK only if we aren't
// authenticating since string responses during
// authentication don't need an OK.
$this->_recvLn();
}
return $line;
}
if ($auth) {
// String responses during authentication don't need an
// OK.
$response .= $line;
return rtrim($response);
}
$response .= $line . "\r\n";
$referralCount++;
}
}
return PEAR::raiseError('Max referral count (' . $referralCount . ') reached. Cyrus murder loop error?', 7);
}
/**
* Returns the name of the best authentication method that the server
* has advertised.
*
* @param string $userMethod Only consider this method as available.
*
* @return string The name of the best supported authentication method or
* a PEAR_Error object on failure.
*/
function _getBestAuthMethod($userMethod = null)
{
if (!isset($this->_capability['sasl'])) {
return PEAR::raiseError('This server doesn\'t support any authentication methods. SASL problem?');
}
if (!$this->_capability['sasl']) {
return PEAR::raiseError('This server doesn\'t support any authentication methods.');
}
if ($userMethod) {
if (in_array($userMethod, $this->_capability['sasl'])) {
return $userMethod;
}
return PEAR::raiseError(
sprintf('No supported authentication method found. The server supports these methods: %s, but we want to use: %s',
implode(', ', $this->_capability['sasl']),
$userMethod));
}
foreach ($this->supportedAuthMethods as $method) {
if (in_array($method, $this->_capability['sasl'])) {
return $method;
}
}
return PEAR::raiseError(
sprintf('No supported authentication method found. The server supports these methods: %s, but we only support: %s',
implode(', ', $this->_capability['sasl']),
implode(', ', $this->supportedAuthMethods)));
}
/**
* Starts a TLS connection.
*
* @return boolean True on success, PEAR_Error on failure.
*/
function _startTLS()
{
if (PEAR::isError($res = $this->_doCmd('STARTTLS'))) {
return $res;
}
if (!stream_socket_enable_crypto($this->_sock->fp, true, STREAM_CRYPTO_METHOD_TLS_CLIENT)) {
return PEAR::raiseError('Failed to establish TLS connection', 2);
}
$this->_debug('STARTTLS negotiation successful');
// The server should be sending a CAPABILITY response after
// negotiating TLS. Read it, and ignore if it doesn't.
// Unfortunately old Cyrus versions are broken and don't send a
// CAPABILITY response, thus we would wait here forever. Parse the
// Cyrus version and work around this broken behavior.
if (!preg_match('/^CYRUS TIMSIEVED V([0-9.]+)/', $this->_capability['implementation'], $matches) ||
version_compare($matches[1], '2.3.10', '>=')) {
$this->_doCmd();
}
// Query the server capabilities again now that we are under
// encryption.
if (PEAR::isError($res = $this->_cmdCapability())) {
return PEAR::raiseError(
'Failed to connect, server said: ' . $res->getMessage(), 2
);
}
return true;
}
/**
* Returns the length of a string.
*
* @param string $string A string.
*
* @return integer The length of the string.
*/
function _getLineLength($string)
{
if (extension_loaded('mbstring')) {
return mb_strlen($string, 'latin1');
} else {
return strlen($string);
}
}
/**
* Locale independant strtoupper() implementation.
*
* @param string $string The string to convert to lowercase.
*
* @return string The lowercased string, based on ASCII encoding.
*/
function _toUpper($string)
{
$language = setlocale(LC_CTYPE, 0);
setlocale(LC_CTYPE, 'C');
$string = strtoupper($string);
setlocale(LC_CTYPE, $language);
return $string;
}
/**
* Converts strings into RFC's quoted-string or literal-c2s form.
*
* @param string $string The string to convert.
*
* @return string Result string.
*/
function _escape($string)
{
// Some implementations don't allow UTF-8 characters in quoted-string,
// use literal-c2s.
if (preg_match('/[^\x01-\x09\x0B-\x0C\x0E-\x7F]/', $string)) {
return sprintf("{%d+}\r\n%s", $this->_getLineLength($string), $string);
}
return '"' . addcslashes($string, '\\"') . '"';
}
/**
* Write debug text to the current debug output handler.
*
* @param string $message Debug message text.
*
* @return void
*/
function _debug($message)
{
if ($this->_debug) {
if ($this->_debug_handler) {
call_user_func_array($this->_debug_handler, array(&$this, $message));
} else {
echo "$message\n";
}
}
}
}

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