<?php
/* vim: set expandtab tabstop=4 shiftwidth=4: */
// +--------------------------------------------------------------------------+
// | Net_LDAP                                                                 |
// +--------------------------------------------------------------------------+
// | Copyright (c) 1997-2003 The PHP Group                                    |
// +--------------------------------------------------------------------------+
// | This library is free software; you can redistribute it and/or            |
// | modify it under the terms of the GNU Lesser General Public               |
// | License as published by the Free Software Foundation; either             |
// | version 2.1 of the License, or (at your option) any later version.       |
// |                                                                          |
// | This library 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        |
// | Lesser General Public License for more details.                          |
// |                                                                          |
// | You should have received a copy of the GNU Lesser General Public         |
// | License along with this library; if not, write to the Free Software      |
// | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA |
// +--------------------------------------------------------------------------+
// | Authors: Tarjej Huse                                                     |
// |          Jan Wagner                                                      |
// +--------------------------------------------------------------------------+
//
// $Id: LDAP.php,v 1.19.2.10 2005/03/01 12:27:36 jw Exp $

require_once('PEAR.php');
require_once('LDAP/Entry.php');
require_once('LDAP/Search.php');


/**
 *  Error constants for errors that are not LDAP errors 
 */

define ('NET_LDAP_ERROR', 1000);


/**
 * Net_LDAP - manipulate LDAP servers the right way!
 *
 * @author Tarjei Huse
 * @author Jan Wagner
 * @version $Revision: 1.19.2.10 $
 * @package Net_LDAP
 */
 class Net_LDAP extends PEAR
{
    /**
     * Class configuration array
     *
     * dn       = the DN to bind as.
     * host     = the ldap host to connect to
     * password = no explanation needed
     * base     = ldap base
     * port     = the server port
     * tls      = when set, ldap_start_tls() is run after connecting.
     * version  = ldap version (defaults to v 3)
     * filter   = default search filter
     * scope    = default search scope
     *
     * @access private
     * @var array
     */
     var $_config = array('dn' => '',
                          'host' => 'localhost',
                          'password' => '',
                          'tls' => false,
                          'base' => '',
                          'port' => 389,
                          'version' => 3,
                          'options' => array(),
                          'filter' => '(objectClass=*)',
                          'scope' => 'sub');

    /**
     * LDAP resource link.
     *
     * @access private
     * @var resource
     */
    var $_link;

    /**
     * Net_LDAP Release Version
     *
     * @access private
     * @var string
     */
    var $_version = "0.6.6";
    
    /**
     * Net_LDAP_Schema object
     *
     * @access private
     * @var object Net_LDAP_Schema
     */
    var $_schema = null;
    
    /**
     * Cache for attribute encoding checks
     *
     * @access private
     * @var array Hash with attribute names as key and boolean value
     *            to determine whether they should be utf8 encoded or not.
     */
    var $_schemaAttrs = array();

    /**
     * Net_LDAP constructor
     *
     * Sets the config array
     *
     * @access protected
     * @param array Configuration array
     * @return void
     * @see $_config
     */
    function Net_LDAP($_config = array())
    {
        $this->PEAR('Net_LDAP_Error');
        
        foreach ($_config as $k => $v) {
            $this->_config[$k] = $v;
        }
    }
    
    /**
     * Creates the initial ldap-object
     *
     * Static function that returns either an error object or the new Net_LDAP object.
     * Something like a factory. Takes a config array with the needed parameters. 
     *
     * @access public
     * @param array Configuration array
     * @return mixed object Net_LDAP_Error or Net_LDAP
     * @see $_config
     */
    function &connect($config = array())
    {
        if (!function_exists('ldap_connect')){
            return $this->raiseError("It seems that you do not have the ldap-extension installed. Please install it before using this package.");
        }
        @$obj =& new Net_LDAP($config);
        $err  = $obj->bind();

        if (Net_LDAP::isError($err)) {
            return $err;
        }
        return $obj;
    }

    /**
     * Bind to the ldap-server
     *
     * The function may be used if you do not create the object using Net_LDAP::connect.
     *
     * @access public
     * @param array Configuration array
     * @return mixed Net_LDAP_Error or true
     * @see $_config
     */
    function bind($config = array())
    {
        foreach ($config as $k => $v) {
            $this->_config[$k] = $v;
        }

        if ($this->_config['host']) {
             $this->_link = @ldap_connect($this->_config['host'], $this->_config['port']);
        } else {
             return $this->raiseError("Host not defined in config. {$this->_config['host']}");
        }

        if (!$this->_link) {            
            // there is no good errorcode for this one! I chose 52.
            return $this->raiseError("Could not connect to server. ldap_connect failed.", 52);
        }
        // You must set the version and start tls BEFORE binding!
        
        if ($this->_config['version'] != 2 && Net_LDAP::isError($msg = $this->setLDAPVersion())) {
            return $msg;
        }
        
        if ($this->_config['tls'] && Net_LDAP::isError($msg = $this->startTLS())) {
            return $msg;
        }
        
        if (isset($this->_config['options']) &&
            is_array($this->_config['options']) &&
            count($this->_config['options']))
        {
            foreach ($this->_config['options'] as $opt => $val) {
                $err = $this->setOption($opt, $val);
                if (Net_LDAP::isError($err)) {
                    return $err;
                }
            }
        }
        
        if (isset($this->_config['dn']) && isset($this->_config['password'])) {
             $bind = @ldap_bind($this->_link, $this->_config['dn'], $this->_config['password']);
        } else {
             $bind = @ldap_bind($this->_link);
        }

        if (!$bind) {
             return $this->raiseError("Bind failed " . @ldap_error($this->_link), @ldap_errno($this->_link));
        }

        return true;
    }

    /**
     * ReBind to the ldap-server using another dn and password
     *
     * The function may be used if you do not create the object using Net_LDAP::connect.
     *
     * @access public
     * @param string $dn - the DN to bind as.
     *        string $password - the bassword to use.
     * @return mixed Net_LDAP_Error or true
     * @see $_config
     */
   
    function reBind ($dn = null, $password = null) 
    {
       
        if ($dn && $password ) {
            $bind = @ldap_bind($this->_link, $dn, $password);
        } else {
            $bind = @ldap_bind($this->_link);
        }

        if (!$bind) {
            return $this->raiseError("Bind failed " . @ldap_error($this->_link), @ldap_errno($this->_link));
        }
        return true;
    }
    
    /**
     * Starts an encrypted session
     *
     * @access public
     * @return mixed True or Net_LDAP_Error
     */
    function startTLS()
    {
        if (!@ldap_start_tls($this->_link)) {
            return $this->raiseError("TLS not started. Error:" . @ldap_error($this->_link), @ldap_errno($this->_link));
        }
        return true;
    }
    
    /**
     * alias function of startTLS() for perl-ldap interface
     * 
     * @see startTLS()
     */
    function start_tls() 
    {
        $args = func_get_args();
        return call_user_func_array(array($this, 'startTLS' ), $args);
    }

    /**
     * Close LDAP connection.
     *
     * Closes the connection. Use this when the session is over.
     *
     * @return void
     */
    function done()
    {
        $this->_Net_LDAP();
    }

    /**
     * Destructor
     *
     * @access private
     */
    function _Net_LDAP()
    {
        @ldap_close($this->_link);
    }

    /**
     * Add a new entryobject to a directory.
     *
     * Use add to add a new Net_LDAP_Entry object to the directory.
     *
     * @param object Net_LDAP_Entry
     * @return mixed Net_LDAP_Error or true
     */
    function add($entry)
    {
        if (@ldap_add($this->_link, $entry->dn(), $entry->attributes())) {
             return true;
        } else {
             return $this->raiseError("Could not add entry " . $entry->dn() . " " . @ldap_error($this->_link),
                                       @ldap_errno($this->_link));
        }
    }

    /**
     * Delete an entry from the directory
     *
     * The object may either be a string representing the dn or a Net_LDAP_Entry object.
     * The param array may contain a boolean value named recursive. When set, all subentries
     * of the Entry will be deleted as well
     *
     * @access public
     * @param mixed string or Net_LDAP_Entry
     * @param array
     * @return mixed Net_LDAP_Error or true  
     */
    function delete($dn, $param = array())
    {
        if (is_object($dn) && strtolower(get_class($dn)) == 'net_ldap_entry') {
             $dn = $dn->dn();
        } else {
            if (!is_string($dn)) {
                // this is what the server would say: invalid_dn_syntax.
                return $this->raiseError("$dn not a string nor an entryobject!", 34); 
            }
        }
        
        if ($param['recursive'] ) {
            $searchresult = @ldap_list($this->_link, $dn, '(objectClass=*)', array());
            
            if ($searchresult) {
                $entries = @ldap_get_entries($this->_link, $searchresult);

                for ($i=0; $i<$entries['count']; $i++) {
                    $result = $this->delete($entries[$i]['dn'], array('recursive' => true));
                    if (!$result) {
                        $errno = @ldap_errno($this->_link);
                        return $this->raiseMessage ("Net_LDAP::delete: " . $this->errorMessage($errno), $errno);
                    }                
                    if(PEAR::isError($result)){
                        return $result;
                    }                
                }
            }
        }
        if (!@ldap_delete($this->_link, $dn)) {
            $error = ldap_errno($this->_link );                
            if ($error == 66) {
                /* entry has subentries */
                return $this->raiseError('Net_LDAP::delete: Cound not delete entry ' . $dn .
                                         ' because of subentries. Use the recursive param to delete them.'); 
            } else {
                return $this->raiseError("Net_LDAP::delete: Could not delete entry " . $dn ." because: ".
                                         $this->errorMessage($error),  $error);
            }
        }
        return true;
    }

    /**
     * Modify an ldapentry
     *
     * This is taken from the perlpod of net::ldap, and explains things quite nicely.
     * modify ( DN, OPTIONS )
     * Modify the contents of DN on the server. DN May be a
     * string or a Net::LDAP::Entry object.
     *
     * dn  This option is here for compatibility only, and
     * may be removed in future.  Previous releases did
     * not take the DN argument which replaces this
     * option.
     *
     * add The add option should be a reference to a HASH.
     * The values of the HASH are the attributes to add,
     * and the values may be a string or a reference to a
     * list of values.
     *
     * delete
     * A reference to an ARRAY of attributes to delete.
     * TODO: This does not support deleting one or two values yet - use
     * replace.
     *
     * replace
     * The <replace> option takes a argument in the same
     * form as add, but will cause any existing
     * attributes with the same name to be replaced. If
     * the value for any attribute in the rray is a ref
     * erence to an empty string the all instances of the
     * attribute will be deleted.
     *
     * changes
     * This is an alternative to add, delete and replace
     * where the whole operation can be given in a single
     * argument. The argument should be a array
     *
     * Values in the ARRAY are used in pairs, the first
     * is the operation add, delete or replace and the
     * second is a reference to an ARRAY of attribute
     * values.
     *
     * The attribute value list is also used in pairs.
     * The first value in each pair is the attribute name
     * and the second is a reference to a list of values.
     *
     * Example:
     * $ldap->modify ( $dn, array (changes => array(
     * 'delete' => array('faxNumber' => ''),
     * 'add' => array('sn' => 'Barr'),
     * 'replace' => array(email => 'tarjei@nu.no'))));
     *
     * @access public
     * @param string
     * @param array
     * @return mixed Net_LDAP_Error or true
     */
    function modify($dn , $params = array())
    {
        if (is_object($dn)) {
             $dn = $dn->dn();
        }
         // since $params['dn'] is not used in net::ldap now:
        if (isset($params['dn'])) {
             return $this->raiseError("This feature will not be implemented!");
        }
        // new code from rafael at krysciak dot de
        if(array_key_exists('changes', $params)) {
            $_params = $params;
        } else {
            $_params['changes'] = $params;
        }
        if (is_array($_params['changes'])) {
            foreach($_params['changes'] AS $option => $atrr) {
                switch($option) {
                    case 'add':
                        $command = $dn_exists ? 'ldap_mod_add':'ldap_add';
                    break;
                    case 'replace':
                        $command = 'ldap_mod_replace';
                    break;
                    case 'delete':
                        $command = 'ldap_mod_del';
                                                // to delete an attribute with a specific value you
                                                // need a hash array('attr_name' => array('attr_value_1', ... ,'attr_value_n'))
                                                // the hash array('attr_name' => 'attr_value') will be converted
                                                // automatically to array('attr_name' => array('attr_value'))
                        foreach($atrr AS $atrr_field => $atrr_value) {
                            if(!is_array($atrr_value)) {
                                $atrr[$atrr_field] = array($atrr_value);
                            }
                        }
                    break;
                    default:
                        return $this->raiseError("Net_LDAP::modify: not supported option " . $option);
                    break;
                } // end switch($option) {

                if(!@call_user_func($command, $this->_link, $dn, $atrr)) {
                   return $this->raiseError("Net_LDAP::modify: $dn not modified because:" . ldap_error($this->_link), ldap_errno($this->_link));
                }
            } // end foreach($_params['changes'] AS $option => $atrr) {
        } // end if (is_array($_params['changes'])) {
        // everything went fine :)
        return true;        

        /* old broken code see bug#2987
        if (isset($params['changes'])) {

             if (isset($params['changes']['add']) &&
                 !@ldap_modify($this->_link, $dn, $params['changes']['add'])) {

                 return $this->raiseError("Net_LDAP::modify: $dn not modified because:" . ldap_error($this->_link),
                                           ldap_errno($this->_link));
             }

             if (isset($params['changes']['replace']) &&
                 !@ldap_modify($this->_link, $dn, $params['changes']['replace'])) {

                 return $this->raiseError("Net_LDAP::modify: replace change didn't work: " . ldap_error($this->_link),
                                          ldap_errno($this->_link));
             }

             if (isset($params['changes']['delete']) &&
                 !@ldap_mod_del($this->_link, $dn, $params['changes']['delete'])) {

                 return $this->raiseError("Net_LDAP::modify:delete did not work" . ldap_error($this->_link),
                                          ldap_errno($this->_link));
             }
        }

        if (isset($params['add']) && !@ldap_add($this->_link, $dn, $params['add'])) {
            return $this->raiseError(ldap_error($this->_link), ldap_errno($this->_link));
        }

        if (isset($params['replace']) && !@ldap_modify($this->_link, $dn, $params['replace'])) {
            return $this->raiseError(ldap_error($this->_link), ldap_errno($this->_link));
        }

        if (isset($params['delete'])) {
             // since you delete an attribute by making it empty:
            foreach ($params['delete'] as $k) {
                $params['delete'][$k] = '';
            }

            if (!@ldap_modify($this->_link, $dn, $params['delete'])) {
                 return $this->raiseError(ldap_error($this->_link), ldap_errno($this->_link));
            }
        }
        // everything went fine :)
        return true;
        */
        
    }

    /**
     * Run a ldap query
     *
     * Search is used to query the ldap-database.
     * $base and $filter may be ommitted. BaseDN and default filter will then be used.
     * Params may contain:
     *
     * scope: The scope which will be used for searching 
     *        base - Just one entry
     *        sub  - The whole tree
     *        one  - Immediately below $base
     * sizelimit: Limit the number of entries returned (default: 0),
     * timelimit: Limit the time spent for searching (default: 0),
     * attrsonly: If true, the search will only return the attribute names, NO values
     * attributes: Array of attribute names, which the entry should contain. It is good practice
     *             to limit this to just the ones you need, so by default this function does not
     *             return any attributes at all.
     * [NOT IMPLEMENTED]
     * deref: By default aliases are dereferenced to locate the base object for the search, but not when
     *        searching subordinates of the base object. This may be changed by specifying one of the
     *        following values:
     *       
     *        never  - Do not dereference aliases in searching or in locating the base object of the search.
     *        search - Dereference aliases in subordinates of the base object in searching, but not in 
     *                locating the base object of the search. 
     *        find
     *        always
     *
     * @access public
     * @param string LDAP searchbase 
     * @param string LDAP search filter
     * @param array Array of options
     * @return object mixed Net_LDAP_Search or Net_LDAP_Error
     */
    function search($base = null, $filter = null, $params = array())
    {		
    	if (is_null($base)) {
            $base = $this->_config['base'];
        }
        if (is_null($filter)) {
            $filter = $this->_config['filter'];
        }        
        
        /* setting searchparameters  */
        (isset($params['sizelimit']))  ? $sizelimit  = $params['sizelimit']  : $sizelimit = 0;
        (isset($params['timelimit']))  ? $timelimit  = $params['timelimit']  : $timelimit = 0;
        (isset($params['attrsonly']))  ? $attrsonly  = $params['attrsonly']  : $attrsonly = 0;        
        (isset($params['attributes'])) ? $attributes = $params['attributes'] : $attributes = array('');        
       
        if (!is_array($attributes)) {
            $this->raiseError("The param attributes must be an array!");
        }
       
        /* scoping makes searches faster!  */                 		
        $scope = (isset($params['scope']) ? $params['scope'] : $this->_config['scope']);
        
        switch ($scope) {
        	case 'one':
        		$search_function = 'ldap_list';
        		break;
        	case 'base':
        		$search_function = 'ldap_read';
        		break;
        	default:
        		$search_function = 'ldap_search';
        }               
                
        $search = @call_user_func($search_function, 
                                  $this->_link,
                                  $base,
                                  $filter,
                                  $attributes,
                                  $attrsonly,
                                  $sizelimit,
                                  $timelimit);

        if ($err = ldap_errno($this->_link)) { 

            if ($err == 32) {
                // Errorcode 32 = no such object, i.e. a nullresult.
                return $obj =& new Net_LDAP_Search ($search, $this->_link); 
                
            // Errorcode 4 = sizelimit exeeded. this will be handled better in time...
            //} elseif ($err == 4) {
            //    return $obj = & new Net_LDAP_Search ($search, $this->_link); 
            
            } elseif ($err == 87) {
                // bad search filter
                return $this->raiseError($this->errorMessage($err) . "($filter)", $err);
            } else {
                $msg = "\nParameters:\nBase: $base\nFilter: $filter\nScope: $scope";
                return $this->raiseError($this->errorMessage($err) . $msg, $err);                 
            }
        } else {
            @$obj =& new Net_LDAP_Search($search, $this->_link);
           return $obj;
        }

    }

    /**
     * Set an LDAP option
     *
     * @access public
     * @param string Option to set
     * @param mixed Value to set Option to
     * @return mixed Net_LDAP_Error or true
     */
    function setOption($option, $value)
    {
        if ($this->_link) {
            if (defined($option)) {
                if (@ldap_set_option($this->_link, constant($option), $value)) {
                    return true;
                } else {
                    $err = @ldap_errno($this->_link);
                    if ($err) {
                        $msg = @ldap_err2str($err);                        
                    } else {
                        $err = NET_LDAP_ERROR;
                        $msg = $this->errorMessage($err);
                    } 
                    return $this->raiseError($msg, $err);
                }
            } else {
                return $this->raiseError("Unkown Option requested");
            }    
        } else {
            return $this->raiseError("No LDAP connection");
        }
    }

    /**
     * Get an LDAP option value
     *
     * @access public
     * @param string Option to get
     * @return mixed Net_LDAP_Error or option value
     */
    function getOption($option)
    {
        if ($this->_link) {
            if (defined($option)) {
                if (@ldap_get_option($this->_link, constant($option), $value)) {
                    return $value;
                } else {
                    $err = @ldap_errno($this->_link);
                    if ($err) {
                        $msg = @ldap_err2str($err);                        
                    } else {
                        $err = NET_LDAP_ERROR;
                        $msg = $this->errorMessage($err);
                    } 
                    return $this->raiseError($msg, $err);
                }
            } else {
                $this->raiseError("Unkown Option requested");
            }    
        } else {
            $this->raiseError("No LDAP connection");
        }
    }

    /**
     * Get the LDAP_PROTOCOL_VERSION that is used on the connection.
     *
     * A lot of ldap functionality is defined by what protocol version the ldap server speaks.
     * This might be 2 or 3.
     *
     * @return int
     */
    function getLDAPVersion()
    {
        if($this->_link) {
            $version = $this->getOption("LDAP_OPT_PROTOCOL_VERSION");
        } else {
            $version = $this->_config['version'];
        }
        return $version;
    }

    /**
     * Set the LDAP_PROTOCOL_VERSION that is used on the connection.
     *
     * @param int Version to set
     * @return mixed Net_LDAP_Error or TRUE
     */
    function setLDAPVersion($version = 0)
    {
        if (!$version) {
            $version = $this->_config['version'];
        }
        return $this->setOption("LDAP_OPT_PROTOCOL_VERSION", $version);
    }

    /**
     * Get the Net_LDAP version. 
     *
     * Return the Net_LDAP version
     *
     * @return string Net_LDAP version
     */
    function getVersion ()
    {
        return $this->_version;
    }

    /**
     * Tell if a dn already exists 
     *
     * @param string
     * @return boolean
     */
    function dnExists($dn)
    {
        $dns = explode(",",$dn);
        $filter = array_shift($dns);
        $base= implode($dns,',');
        //$base = $dn;        
        //$filter = '(objectclass=*)';
        
        $result = @ldap_list($this->_link, $base, $filter, array(), 1, 1);
        if (ldap_errno($this->_link) == 32) {
            return false;
        }
        if (ldap_errno($this->_link) != 0) {
            $this->raiseError(ldap_error($this->_link), ldap_errno($this->_link));
        }
        if (@ldap_count_entries($this->_link, $result)) {
            return true;
        }
        return false;
    }
    

   /**
    * Get a specific entry based on the dn
    *
    * @param string dn
    * @param array Array of Attributes to select
    * @return object Net_LDAP_Entry or Net_LDAP_Error 
    */
   function &getEntry($dn, $attr = array(''))
   {
        $result = $this->search($dn, '(objectClass=*)', array('scope' => 'base', 'attributes' => $attr));
        if (Net_LDAP::isError($result)) {
            return $result;
        }
        $entry = $result->shiftEntry();
        if (false == $entry) {
            return $this->raiseError('Could not fetch entry');
        }
        return $entry;
   }
   

    /**
     * Returns the string for an ldap errorcode.
     *
     * Made to be able to make better errorhandling
     * Function based on DB::errorMessage()
     * Tip: The best description of the errorcodes is found here: http://www.directory-info.com/LDAP/LDAPErrorCodes.html
     *
     * @param int Error code
     * @return string The errorstring for the error.
     */
    function errorMessage($errorcode)
    {
        $errorMessages = array(
                              0x00 => "LDAP_SUCCESS",
                              0x01 => "LDAP_OPERATIONS_ERROR",
                              0x02 => "LDAP_PROTOCOL_ERROR",
                              0x03 => "LDAP_TIMELIMIT_EXCEEDED",
                              0x04 => "LDAP_SIZELIMIT_EXCEEDED",
                              0x05 => "LDAP_COMPARE_FALSE",
                              0x06 => "LDAP_COMPARE_TRUE",
                              0x07 => "LDAP_AUTH_METHOD_NOT_SUPPORTED",
                              0x08 => "LDAP_STRONG_AUTH_REQUIRED",
                              0x09 => "LDAP_PARTIAL_RESULTS",
                              0x0a => "LDAP_REFERRAL",
                              0x0b => "LDAP_ADMINLIMIT_EXCEEDED",
                              0x0c => "LDAP_UNAVAILABLE_CRITICAL_EXTENSION",
                              0x0d => "LDAP_CONFIDENTIALITY_REQUIRED",
                              0x0e => "LDAP_SASL_BIND_INPROGRESS",
                              0x10 => "LDAP_NO_SUCH_ATTRIBUTE",
                              0x11 => "LDAP_UNDEFINED_TYPE",
                              0x12 => "LDAP_INAPPROPRIATE_MATCHING",
                              0x13 => "LDAP_CONSTRAINT_VIOLATION",
                              0x14 => "LDAP_TYPE_OR_VALUE_EXISTS",
                              0x15 => "LDAP_INVALID_SYNTAX",
                              0x20 => "LDAP_NO_SUCH_OBJECT",
                              0x21 => "LDAP_ALIAS_PROBLEM",
                              0x22 => "LDAP_INVALID_DN_SYNTAX",
                              0x23 => "LDAP_IS_LEAF",
                              0x24 => "LDAP_ALIAS_DEREF_PROBLEM",
                              0x30 => "LDAP_INAPPROPRIATE_AUTH",
                              0x31 => "LDAP_INVALID_CREDENTIALS",
                              0x32 => "LDAP_INSUFFICIENT_ACCESS",
                              0x33 => "LDAP_BUSY",
                              0x34 => "LDAP_UNAVAILABLE",
                              0x35 => "LDAP_UNWILLING_TO_PERFORM",
                              0x36 => "LDAP_LOOP_DETECT",
                              0x3C => "LDAP_SORT_CONTROL_MISSING",
                              0x3D => "LDAP_INDEX_RANGE_ERROR",
                              0x40 => "LDAP_NAMING_VIOLATION",
                              0x41 => "LDAP_OBJECT_CLASS_VIOLATION",
                              0x42 => "LDAP_NOT_ALLOWED_ON_NONLEAF",
                              0x43 => "LDAP_NOT_ALLOWED_ON_RDN",
                              0x44 => "LDAP_ALREADY_EXISTS",
                              0x45 => "LDAP_NO_OBJECT_CLASS_MODS",
                              0x46 => "LDAP_RESULTS_TOO_LARGE",
                              0x47 => "LDAP_AFFECTS_MULTIPLE_DSAS",
                              0x50 => "LDAP_OTHER",
                              0x51 => "LDAP_SERVER_DOWN",
                              0x52 => "LDAP_LOCAL_ERROR",
                              0x53 => "LDAP_ENCODING_ERROR",
                              0x54 => "LDAP_DECODING_ERROR",
                              0x55 => "LDAP_TIMEOUT",
                              0x56 => "LDAP_AUTH_UNKNOWN",
                              0x57 => "LDAP_FILTER_ERROR",
                              0x58 => "LDAP_USER_CANCELLED",
                              0x59 => "LDAP_PARAM_ERROR",
                              0x5a => "LDAP_NO_MEMORY",
                              0x5b => "LDAP_CONNECT_ERROR",
                              0x5c => "LDAP_NOT_SUPPORTED",
                              0x5d => "LDAP_CONTROL_NOT_FOUND",
                              0x5e => "LDAP_NO_RESULTS_RETURNED",
                              0x5f => "LDAP_MORE_RESULTS_TO_RETURN",
                              0x60 => "LDAP_CLIENT_LOOP",
                              0x61 => "LDAP_REFERRAL_LIMIT_EXCEEDED",
                              1000 => "Unknown Net_LDAP error" 
                              );

         return isset($errorMessages[$errorcode]) ? $errorMessages[$errorcode] : $errorMessages[NET_LDAP_ERROR];
    }

    /**
     * Tell whether value is a Net_LDAP_Error or not
     *
     * @access public
     * @param mixed 
     * @return boolean
     */
    function isError($value)
    {
        return (is_a($value, "Net_LDAP_Error") || parent::isError($value));
    }

    /**
     * gets a root dse object
     *
     * @access public
     * @author Jan Wagner <wagner@netsols.de>
     * @param array Array of attributes to search for
     * @return object mixed Net_LDAP_Error or Net_LDAP_RootDSE
     */
    function &rootDse($attrs = null) 
    {
        require_once('Net/LDAP/RootDSE.php');
        
        if (is_array($attrs) && count($attrs) > 0 ) {
            $attributes = $attrs;
        } else {
            $attributes = array('namingContexts',
                                'altServer',
                                'supportedExtension',
                                'supportedControl',
                                'supportedSASLMechanisms',
                                'supportedLDAPVersion',
                                'subschemaSubentry' );
        }
        $result = $this->search('', '(objectClass=*)', array('attributes' => $attributes, 'scope' => 'base'));
        if (Net_LDAP::isError($result)) return $result;

        $entry = $result->shift_entry();
        if (false === $entry) return $this->raiseError('Could not fetch RootDSE entry');

        return new Net_LDAP_RootDSE($entry);
    }
    
    /**
     * alias function of rootDse() for perl-ldap interface
     *
     * @access public
     * @see rootDse()
     */
    function &root_dse() 
    {
        $args = func_get_args();
        return call_user_func_array(array($this, 'rootDse'), $args);
    }
    
    /**
     * get a schema object
     *
     * @access public
     * @author Jan Wagner <wagner@netsols.de>
     * @param string Subschema entry dn
     * @return object mixed Net_LDAP_Schema or Net_LDAP_Error
     */
     function &schema($dn = null)
     {
        require_once('Net/LDAP/Schema.php');
        
        $schema =& new Net_LDAP_Schema();

        if (is_null($dn)) {
            // get the subschema entry via root dse
            $dse = $this->rootDSE(array('subschemaSubentry'));
            if (false == Net_LDAP::isError($dse)) {
                $base = $dse->getValue('subschemaSubentry', 'single');
                if (!Net_LDAP::isError($base)) {
                    $dn = $base;
                }
            }
        }
        if (is_null($dn)) {
            $dn = 'cn=Subschema';
        }        
        
        // fetch the subschema entry
        $result = $this->search($dn, '(objectClass=*)',
                                 array('attributes' => array_values($schema->types), 'scope' => 'base'));
        if (Net_LDAP::isError($result)) {
            return $result;
        }

        $entry = $result->shift_entry();
        if (false === $entry) {
            return $this->raiseError('Could not fetch Subschema entry');
        }
        
        $schema->parse($entry);

        return $schema;
    }

    /**
     * Encodes given attributes to UTF8 if needed
     *
     * This function takes attributes in an array and then checks against the schema if they need
     * UTF8 encoding. If that is so, they will be encoded. An encoded array will be returned and
     * can be used for adding or modifying.
     *
     * @access public
     * @param array Array of attributes
     * @return array Array of UTF8 encoded attributes
     */
    function utf8Encode($attributes)
    {
        return $this->_utf8($attributes, 'utf8_encode');
    }

    /**
     * Decodes the given attribute values
     *
     * @access public
     * @param array Array of attributes
     * @return array Array with decoded attribute values
     */
    function utf8Decode($attributes)
    {
        return $this->_utf8($attributes, 'utf8_decode');
    }

    /**
     * Encodes or decodes attribute values if needed
     *
     * @access private
     * @param array Array of attributes
     * @param array Function to apply to attribute values
     * @return array Array of attributes with function applied to values
     */
    function _utf8($attributes, $function)
    {
        if (!$this->_schema) {
            $this->_schema = $this->schema();
        }

        if (!$this->_link || Net_LDAP::isError($this->_schema) || !function_exists($function)) {
           return $attributes;
        }

        if (is_array($attributes) && count($attributes) > 0) {
            
            foreach( $attributes as $k => $v ) {
                
                if (!isset($this->_schemaAttrs[$k])) {

                    $attr = $this->_schema->get('attribute', $k);
                    if (Net_LDAP::isError($attr)) {
                        continue;
                    }

                    if (false !== strpos($attr['syntax'], '1.3.6.1.4.1.1466.115.121.1.15')) {
                        $encode = true;
                    } else {
                        $encode = false;
                    }                  
                    $this->_schemaAttrs[$k] = $encode;
                  
                } else {
                    $encode = $this->_schemaAttrs[$k];
                }

                if ($encode) {
                    if (is_array($v)) {
                        foreach ($v as $ak => $av) {
                            $v[$ak] = call_user_func($function, $av );
                        }
                    } else {
                        $v = call_user_func($function, $v);
                    }
                }
                $attributes[$k] = $v;
            }
        }
        return $attributes;
    }
}

/**
 * Net_LDAP_Error implements a class for reporting portable LDAP error messages.
 *
 * @package Net_LDAP
 */
class Net_LDAP_Error extends PEAR_Error
{
    /**
     * Net_LDAP_Error constructor.
     *
     * @param mixed Net_LDAP error code, or string with error message.
     * @param integer what "error mode" to operate in
     * @param integer what error level to use for $mode & PEAR_ERROR_TRIGGER
     * @param mixed additional debug info, such as the last query
     * @access public
     * @see PEAR_Error
     */
    function Net_LDAP_Error($code = NET_LDAP_ERROR, $mode = PEAR_ERROR_RETURN,
                            $level = E_USER_NOTICE, $debuginfo = null)
    {
        if (is_int($code)) {
            $this->PEAR_Error('Net_LDAP_Error: ' . Net_LDAP::errorMessage($code), $code, $mode, $level, $debuginfo);
        } else {
            $this->PEAR_Error("Net_LDAP_Error: $code", NET_LDAP_ERROR, $mode, $level, $debuginfo);
        }
    }
}
?>