]> git.donarmstrong.com Git - roundcube.git/blobdiff - program/include/rcube_ldap.php
Imported Upstream version 0.6+dfsg
[roundcube.git] / program / include / rcube_ldap.php
index 51879a3153ced6278a14eb0ff5edc01611d4656d..5db60c5dc12e560caa797f5465b6350548c67499 100644 (file)
@@ -4,7 +4,8 @@
  | program/include/rcube_ldap.php                                        |
  |                                                                       |
  | This file is part of the Roundcube Webmail client                     |
- | Copyright (C) 2006-2010, Roundcube Dev. - Switzerland                 |
+ | Copyright (C) 2006-2011, The Roundcube Dev Team                       |
+ | Copyright (C) 2011, Kolab Systems AG                                  |
  | Licensed under the GNU GPL                                            |
  |                                                                       |
  | PURPOSE:                                                              |
  |                                                                       |
  +-----------------------------------------------------------------------+
  | Author: Thomas Bruederli <roundcube@gmail.com>                        |
+ |         Andreas Dick <andudi (at) gmx (dot) ch>                       |
+ |         Aleksander Machniak <machniak@kolabsys.com>                   |
  +-----------------------------------------------------------------------+
 
- $Id: rcube_ldap.php 4509 2011-02-09 10:51:50Z thomasb $
+ $Id: rcube_ldap.php 5261 2011-09-21 12:22:40Z alec $
 
 */
 
  */
 class rcube_ldap extends rcube_addressbook
 {
-  var $conn;
-  var $prop = array();
-  var $fieldmap = array();
-
-  var $filter = '';
-  var $result = null;
-  var $ldap_result = null;
-  var $sort_col = '';
-  var $mail_domain = '';
-  var $debug = false;
-
-  /** public properties */
-  var $primary_key = 'ID';
-  var $readonly = true;
-  var $list_page = 1;
-  var $page_size = 10;
-  var $ready = false;
-
-
-  /**
-   * Object constructor
-   *
-   * @param array      LDAP connection properties
-   * @param boolean    Enables debug mode
-   * @param string     Current user mail domain name
-   * @param integer User-ID
-   */
-  function __construct($p, $debug=false, $mail_domain=NULL)
-  {
-    $this->prop = $p;
-
-    foreach ($p as $prop => $value)
-      if (preg_match('/^(.+)_field$/', $prop, $matches))
-        $this->fieldmap[$matches[1]] = $this->_attr_name(strtolower($value));
-
-    // make sure 'required_fields' is an array
-    if (!is_array($this->prop['required_fields']))
-      $this->prop['required_fields'] = (array) $this->prop['required_fields'];
-
-    foreach ($this->prop['required_fields'] as $key => $val)
-      $this->prop['required_fields'][$key] = $this->_attr_name(strtolower($val));
-
-    $this->sort_col = $p['sort'];
-    $this->debug = $debug;
-    $this->mail_domain = $mail_domain;
-
-    $this->connect();
-  }
-
-
-  /**
-   * Establish a connection to the LDAP server
-   */
-  function connect()
-  {
-    global $RCMAIL;
-    
-    if (!function_exists('ldap_connect'))
-      raise_error(array('code' => 100, 'type' => 'ldap',
-        'file' => __FILE__, 'line' => __LINE__,
-        'message' => "No ldap support in this installation of PHP"), true);
-
-    if (is_resource($this->conn))
-      return true;
-
-    if (!is_array($this->prop['hosts']))
-      $this->prop['hosts'] = array($this->prop['hosts']);
-
-    if (empty($this->prop['ldap_version']))
-      $this->prop['ldap_version'] = 3;
-
-    foreach ($this->prop['hosts'] as $host)
-    {
-      $host = rcube_idn_to_ascii(rcube_parse_host($host));
-      $this->_debug("C: Connect [$host".($this->prop['port'] ? ':'.$this->prop['port'] : '')."]");
-
-      if ($lc = @ldap_connect($host, $this->prop['port']))
-      {
-        if ($this->prop['use_tls']===true)
-          if (!ldap_start_tls($lc))
-            continue;
+    /** public properties */
+    public $primary_key = 'ID';
+    public $groups = false;
+    public $readonly = true;
+    public $ready = false;
+    public $group_id = 0;
+    public $list_page = 1;
+    public $page_size = 10;
+    public $coltypes = array();
+
+    /** private properties */
+    protected $conn;
+    protected $prop = array();
+    protected $fieldmap = array();
+
+    protected $filter = '';
+    protected $result = null;
+    protected $ldap_result = null;
+    protected $sort_col = '';
+    protected $mail_domain = '';
+    protected $debug = false;
+
+    private $base_dn = '';
+    private $groups_base_dn = '';
+    private $group_cache = array();
+    private $group_members = array();
+
+    private $vlv_active = false;
+    private $vlv_count = 0;
+
+
+    /**
+    * Object constructor
+    *
+    * @param array     LDAP connection properties
+    * @param boolean   Enables debug mode
+    * @param string    Current user mail domain name
+    * @param integer User-ID
+    */
+    function __construct($p, $debug=false, $mail_domain=NULL)
+    {
+        $this->prop = $p;
+
+        // check if groups are configured
+        if (is_array($p['groups']) && count($p['groups'])) {
+            $this->groups = true;
+            // set member field
+            if (!empty($p['groups']['member_attr']))
+                $this->prop['member_attr'] = strtolower($p['groups']['member_attr']);
+            else if (empty($p['member_attr']))
+                $this->prop['member_attr'] = 'member';
+        }
 
-        $this->_debug("S: OK");
+        // fieldmap property is given
+        if (is_array($p['fieldmap'])) {
+            foreach ($p['fieldmap'] as $rf => $lf)
+                $this->fieldmap[$rf] = $this->_attr_name(strtolower($lf));
+        }
+        else {
+            // read deprecated *_field properties to remain backwards compatible
+            foreach ($p as $prop => $value)
+                if (preg_match('/^(.+)_field$/', $prop, $matches))
+                    $this->fieldmap[$matches[1]] = $this->_attr_name(strtolower($value));
+        }
+
+        // use fieldmap to advertise supported coltypes to the application
+        foreach ($this->fieldmap as $col => $lf) {
+            list($col, $type) = explode(':', $col);
+            if (!is_array($this->coltypes[$col])) {
+                $subtypes = $type ? array($type) : null;
+                $this->coltypes[$col] = array('limit' => 2, 'subtypes' => $subtypes);
+            }
+            elseif ($type) {
+                $this->coltypes[$col]['subtypes'][] = $type;
+                $this->coltypes[$col]['limit']++;
+            }
+            if ($type && !$this->fieldmap[$col])
+                $this->fieldmap[$col] = $lf;
+        }
+
+        if ($this->fieldmap['street'] && $this->fieldmap['locality'])
+            $this->coltypes['address'] = array('limit' => 1);
+        else if ($this->coltypes['address'])
+            $this->coltypes['address'] = array('type' => 'textarea', 'childs' => null, 'limit' => 1, 'size' => 40);
+
+        // make sure 'required_fields' is an array
+        if (!is_array($this->prop['required_fields']))
+            $this->prop['required_fields'] = (array) $this->prop['required_fields'];
+
+        foreach ($this->prop['required_fields'] as $key => $val)
+            $this->prop['required_fields'][$key] = $this->_attr_name(strtolower($val));
 
-        ldap_set_option($lc, LDAP_OPT_PROTOCOL_VERSION, $this->prop['ldap_version']);
-        $this->prop['host'] = $host;
-        $this->conn = $lc;
-        break;
-      }
-      $this->_debug("S: NOT OK");
+        $this->sort_col    = is_array($p['sort']) ? $p['sort'][0] : $p['sort'];
+        $this->debug       = $debug;
+        $this->mail_domain = $mail_domain;
+
+        $this->_connect();
     }
-    
-    if (is_resource($this->conn))
+
+
+    /**
+    * Establish a connection to the LDAP server
+    */
+    private function _connect()
     {
-      $this->ready = true;
+        global $RCMAIL;
 
-      // User specific access, generate the proper values to use.
-      if ($this->prop['user_specific']) {
-        // No password set, use the session password
-        if (empty($this->prop['bind_pass'])) {
-          $this->prop['bind_pass'] = $RCMAIL->decrypt($_SESSION['password']);
-        }
+        if (!function_exists('ldap_connect'))
+            raise_error(array('code' => 100, 'type' => 'ldap',
+                'file' => __FILE__, 'line' => __LINE__,
+                'message' => "No ldap support in this installation of PHP"),
+                true, true);
 
-        // Get the pieces needed for variable replacement.
-        $fu = $RCMAIL->user->get_username();
-        list($u, $d) = explode('@', $fu);
-        $dc = 'dc='.strtr($d, array('.' => ',dc=')); // hierarchal domain string
+        if (is_resource($this->conn))
+            return true;
 
-        $replaces = array('%dc' => $dc, '%d' => $d, '%fu' => $fu, '%u' => $u);
+        if (!is_array($this->prop['hosts']))
+            $this->prop['hosts'] = array($this->prop['hosts']);
 
-        if ($this->prop['search_base_dn'] && $this->prop['search_filter']) {
-          // Search for the dn to use to authenticate
-          $this->prop['search_base_dn'] = strtr($this->prop['search_base_dn'], $replaces);
-          $this->prop['search_filter'] = strtr($this->prop['search_filter'], $replaces);
+        if (empty($this->prop['ldap_version']))
+            $this->prop['ldap_version'] = 3;
 
-          $this->_debug("S: searching with base {$this->prop['search_base_dn']} for {$this->prop['search_filter']}");
+        foreach ($this->prop['hosts'] as $host)
+        {
+            $host = idn_to_ascii(rcube_parse_host($host));
+            $this->_debug("C: Connect [$host".($this->prop['port'] ? ':'.$this->prop['port'] : '')."]");
 
-          $res = ldap_search($this->conn, $this->prop['search_base_dn'], $this->prop['search_filter'], array('uid'));
-          if ($res && ($entry = ldap_first_entry($this->conn, $res))) {
-            $bind_dn = ldap_get_dn($this->conn, $entry);
+            if ($lc = @ldap_connect($host, $this->prop['port']))
+            {
+                if ($this->prop['use_tls']===true)
+                    if (!ldap_start_tls($lc))
+                        continue;
 
-            $this->_debug("S: search returned dn: $bind_dn");
+                $this->_debug("S: OK");
 
-            if ($bind_dn) {
-              $this->prop['bind_dn'] = $bind_dn;
-              $dn = ldap_explode_dn($bind_dn, 1);
-              $replaces['%dn'] = $dn[0];
+                ldap_set_option($lc, LDAP_OPT_PROTOCOL_VERSION, $this->prop['ldap_version']);
+                $this->prop['host'] = $host;
+                $this->conn = $lc;
+                break;
             }
-          }
+            $this->_debug("S: NOT OK");
         }
-        // Replace the bind_dn and base_dn variables.
-        $this->prop['bind_dn'] = strtr($this->prop['bind_dn'], $replaces);
-        $this->prop['base_dn'] = strtr($this->prop['base_dn'], $replaces);
-      }
-
-      if (!empty($this->prop['bind_dn']) && !empty($this->prop['bind_pass']))
-        $this->ready = $this->bind($this->prop['bind_dn'], $this->prop['bind_pass']);
-    }
-    else
-      raise_error(array('code' => 100, 'type' => 'ldap',
-        'file' => __FILE__, 'line' => __LINE__,
-        'message' => "Could not connect to any LDAP server, last tried $host:{$this->prop[port]}"), true);
-
-    // See if the directory is writeable.
-    if ($this->prop['writable']) {
-      $this->readonly = false;
-    } // end if
-
-  }
-
-
-  /**
-   * Bind connection with DN and password
-   *
-   * @param string Bind DN
-   * @param string Bind password
-   * @return boolean True on success, False on error
-   */
-  function bind($dn, $pass)
-  {
-    if (!$this->conn) {
-      return false;
-    }
-    
-    $this->_debug("C: Bind [dn: $dn] [pass: $pass]");
-    
-    if (@ldap_bind($this->conn, $dn, $pass)) {
-      $this->_debug("S: OK");
-      return true;
-    }
-
-    $this->_debug("S: ".ldap_error($this->conn));
-
-    raise_error(array(
-        'code' => ldap_errno($this->conn), 'type' => 'ldap',
-       'file' => __FILE__, 'line' => __LINE__,
-        'message' => "Bind failed for dn=$dn: ".ldap_error($this->conn)),
-        true);
-
-    return false;
-  }
-
-
-  /**
-   * Close connection to LDAP server
-   */
-  function close()
-  {
-    if ($this->conn)
-    {
-      $this->_debug("C: Close");
-      ldap_unbind($this->conn);
-      $this->conn = null;
-    }
-  }
-
-
-  /**
-   * Set internal list page
-   *
-   * @param  number  Page number to list
-   * @access public
-   */
-  function set_page($page)
-  {
-    $this->list_page = (int)$page;
-  }
-
-
-  /**
-   * Set internal page size
-   *
-   * @param  number  Number of messages to display on one page
-   * @access public
-   */
-  function set_pagesize($size)
-  {
-    $this->page_size = (int)$size;
-  }
-
-
-  /**
-   * Save a search string for future listings
-   *
-   * @param string Filter string
-   */
-  function set_search_set($filter)
-  {
-    $this->filter = $filter;
-  }
-  
-  
-  /**
-   * Getter for saved search properties
-   *
-   * @return mixed Search properties used by this class
-   */
-  function get_search_set()
-  {
-    return $this->filter;
-  }
-
-
-  /**
-   * Reset all saved results and search parameters
-   */
-  function reset()
-  {
-    $this->result = null;
-    $this->ldap_result = null;
-    $this->filter = '';
-  }
-  
-  
-  /**
-   * List the current set of contact records
-   *
-   * @param  array  List of cols to show
-   * @param  int    Only return this number of records
-   * @return array  Indexed list of contact records, each a hash array
-   */
-  function list_records($cols=null, $subset=0)
-  {
-    // add general filter to query
-    if (!empty($this->prop['filter']) && empty($this->filter))
-    {
-      $filter = $this->prop['filter'];
-      $this->set_search_set($filter);
-    }
-
-    // exec LDAP search if no result resource is stored
-    if ($this->conn && !$this->ldap_result)
-      $this->_exec_search();
-    
-    // count contacts for this user
-    $this->result = $this->count();
-
-    // we have a search result resource
-    if ($this->ldap_result && $this->result->count > 0)
-    {
-      if ($this->sort_col && $this->prop['scope'] !== 'base')
-        ldap_sort($this->conn, $this->ldap_result, $this->sort_col);
-
-      $start_row = $subset < 0 ? $this->result->first + $this->page_size + $subset : $this->result->first;
-      $last_row = $this->result->first + $this->page_size;
-      $last_row = $subset != 0 ? $start_row + abs($subset) : $last_row;
-
-      $entries = ldap_get_entries($this->conn, $this->ldap_result);
-      for ($i = $start_row; $i < min($entries['count'], $last_row); $i++)
-        $this->result->add($this->_ldap2result($entries[$i]));
-    }
-
-    return $this->result;
-  }
-
-
-  /**
-   * Search contacts
-   *
-   * @param array   List of fields to search in
-   * @param string  Search value
-   * @param boolean True for strict, False for partial (fuzzy) matching
-   * @param boolean True if results are requested, False if count only
-   * @param boolean (Not used)
-   * @param array   List of fields that cannot be empty
-   * @return array  Indexed list of contact records and 'count' value
-   */
-  function search($fields, $value, $strict=false, $select=true, $nocount=false, $required=array())
-  {
-    // special treatment for ID-based search
-    if ($fields == 'ID' || $fields == $this->primary_key)
-    {
-      $ids = explode(',', $value);
-      $result = new rcube_result_set();
-      foreach ($ids as $id)
-        if ($rec = $this->get_record($id, true))
+
+        if (is_resource($this->conn))
         {
-          $result->add($rec);
-          $result->count++;
-        }
-      
-      return $result;
-    }
-    
-    $filter = '(|';
-    $wc = !$strict && $this->prop['fuzzy_search'] ? '*' : '';
-    if (is_array($this->prop['search_fields']))
-    {
-      foreach ($this->prop['search_fields'] as $k => $field)
-        $filter .= "($field=$wc" . rcube_ldap::quote_string($value) . "$wc)";
-    }
-    else
-    {
-      foreach ((array)$fields as $field)
-        if ($f = $this->_map_field($field))
-          $filter .= "($f=$wc" . rcube_ldap::quote_string($value) . "$wc)";
-    }
-    $filter .= ')';
-
-    // add required (non empty) fields filter
-    $req_filter = '';
-    foreach ((array)$required as $field)
-      if ($f = $this->_map_field($field))
-        $req_filter .= "($f=*)";
-
-    if (!empty($req_filter))
-      $filter = '(&' . $req_filter . $filter . ')';
-
-    // avoid double-wildcard if $value is empty
-    $filter = preg_replace('/\*+/', '*', $filter);
-
-    // add general filter to query
-    if (!empty($this->prop['filter']))
-      $filter = '(&(' . preg_replace('/^\(|\)$/', '', $this->prop['filter']) . ')' . $filter . ')';
-
-    // set filter string and execute search
-    $this->set_search_set($filter);
-    $this->_exec_search();
-    
-    if ($select)
-      $this->list_records();
-    else
-      $this->result = $this->count();
-   
-    return $this->result; 
-  }
-
-
-  /**
-   * Count number of available contacts in database
-   *
-   * @return object rcube_result_set Resultset with values for 'count' and 'first'
-   */
-  function count()
-  {
-    $count = 0;
-    if ($this->conn && $this->ldap_result) {
-      $count = ldap_count_entries($this->conn, $this->ldap_result);
-    } // end if
-    elseif ($this->conn) {
-      // We have a connection but no result set, attempt to get one.
-      if (empty($this->filter)) {
-        // The filter is not set, set it.
-        $this->filter = $this->prop['filter'];
-      } // end if
-      $this->_exec_search();
-      if ($this->ldap_result) {
-        $count = ldap_count_entries($this->conn, $this->ldap_result);
-      } // end if
-    } // end else
-
-    return new rcube_result_set($count, ($this->list_page-1) * $this->page_size);
-  }
-
-
-  /**
-   * Return the last result set
-   *
-   * @return object rcube_result_set Current resultset or NULL if nothing selected yet
-   */
-  function get_result()
-  {
-    return $this->result;
-  }
-  
-  
-  /**
-   * Get a specific contact record
-   *
-   * @param mixed   Record identifier
-   * @param boolean Return as associative array
-   * @return mixed  Hash array or rcube_result_set with all record fields
-   */
-  function get_record($dn, $assoc=false)
-  {
-    $res = null;
-    if ($this->conn && $dn)
-    {
-      $dn = base64_decode($dn);
-
-      $this->_debug("C: Read [dn: $dn] [(objectclass=*)]");
-    
-      if ($this->ldap_result = @ldap_read($this->conn, $dn, '(objectclass=*)', array_values($this->fieldmap)))
-        $entry = ldap_first_entry($this->conn, $this->ldap_result);
-      else
-        $this->_debug("S: ".ldap_error($this->conn));
+            $this->ready = true;
+
+            $bind_pass = $this->prop['bind_pass'];
+            $bind_user = $this->prop['bind_user'];
+            $bind_dn   = $this->prop['bind_dn'];
+
+            $this->base_dn        = $this->prop['base_dn'];
+            $this->groups_base_dn = ($this->prop['groups']['base_dn']) ?
+                $this->prop['groups']['base_dn'] : $this->base_dn;
+
+            // User specific access, generate the proper values to use.
+            if ($this->prop['user_specific']) {
+                // No password set, use the session password
+                if (empty($bind_pass)) {
+                    $bind_pass = $RCMAIL->decrypt($_SESSION['password']);
+                }
+
+                // Get the pieces needed for variable replacement.
+                if ($fu = $RCMAIL->user->get_username())
+                  list($u, $d) = explode('@', $fu);
+                else
+                  $d = $this->mail_domain;
+
+                $dc = 'dc='.strtr($d, array('.' => ',dc=')); // hierarchal domain string
+
+                $replaces = array('%dc' => $dc, '%d' => $d, '%fu' => $fu, '%u' => $u);
+
+                if ($this->prop['search_base_dn'] && $this->prop['search_filter']) {
+                    // Search for the dn to use to authenticate
+                    $this->prop['search_base_dn'] = strtr($this->prop['search_base_dn'], $replaces);
+                    $this->prop['search_filter'] = strtr($this->prop['search_filter'], $replaces);
+
+                    $this->_debug("S: searching with base {$this->prop['search_base_dn']} for {$this->prop['search_filter']}");
+
+                    $res = @ldap_search($this->conn, $this->prop['search_base_dn'], $this->prop['search_filter'], array('uid'));
+                    if ($res && ($entry = ldap_first_entry($this->conn, $res))) {
+                        $bind_dn = ldap_get_dn($this->conn, $entry);
+
+                        $this->_debug("S: search returned dn: $bind_dn");
+
+                        if ($bind_dn) {
+                            $dn = ldap_explode_dn($bind_dn, 1);
+                            $replaces['%dn'] = $dn[0];
+                        }
+                    }
+                }
+                // Replace the bind_dn and base_dn variables.
+                $bind_dn              = strtr($bind_dn, $replaces);
+                $this->base_dn        = strtr($this->base_dn, $replaces);
+                $this->groups_base_dn = strtr($this->groups_base_dn, $replaces);
+
+                if (empty($bind_user)) {
+                    $bind_user = $u;
+                }
+            }
 
-      if ($entry && ($rec = ldap_get_attributes($this->conn, $entry)))
-      {
-        $this->_debug("S: OK");
+            if (!empty($bind_pass)) {
+                if (!empty($bind_dn)) {
+                    $this->ready = $this->_bind($bind_dn, $bind_pass);
+                }
+                else if (!empty($this->prop['auth_cid'])) {
+                    $this->ready = $this->_sasl_bind($this->prop['auth_cid'], $bind_pass, $bind_user);
+                }
+                else {
+                    $this->ready = $this->_sasl_bind($bind_user, $bind_pass);
+                }
+            }
+        }
+        else
+            raise_error(array('code' => 100, 'type' => 'ldap',
+                'file' => __FILE__, 'line' => __LINE__,
+                'message' => "Could not connect to any LDAP server, last tried $host:{$this->prop[port]}"), true);
 
-        $rec = array_change_key_case($rec, CASE_LOWER);
-
-        // Add in the dn for the entry.
-        $rec['dn'] = $dn;
-        $res = $this->_ldap2result($rec);
-        $this->result = new rcube_result_set(1);
-        $this->result->add($res);
-      }
-    }
-
-    return $assoc ? $res : $this->result;
-  }
-  
-  
-  /**
-   * Create a new contact record
-   *
-   * @param array    Hash array with save data
-   * @return encoded record ID on success, False on error
-   */
-  function insert($save_cols)
-  {
-    // Map out the column names to their LDAP ones to build the new entry.
-    $newentry = array();
-    $newentry['objectClass'] = $this->prop['LDAP_Object_Classes'];
-    foreach ($save_cols as $col => $val) {
-      $fld = $this->_map_field($col);
-      if ($fld && $val) {
-        // The field does exist, add it to the entry.
-        $newentry[$fld] = $val;
-      } // end if
-    } // end foreach
-
-    // Verify that the required fields are set.
-    // We know that the email address is required as a default of rcube, so
-    // we will default its value into any unfilled required fields.
-    foreach ($this->prop['required_fields'] as $fld) {
-      if (!isset($newentry[$fld])) {
-        $newentry[$fld] = $newentry[$this->_map_field('email')];
-      } // end if
-    } // end foreach
-
-    // Build the new entries DN.
-    $dn = $this->prop['LDAP_rdn'].'='.rcube_ldap::quote_string($newentry[$this->prop['LDAP_rdn']], true)
-      .','.$this->prop['base_dn'];
-
-    $this->_debug("C: Add [dn: $dn]: ".print_r($newentry, true));
-
-    $res = ldap_add($this->conn, $dn, $newentry);
-    if ($res === FALSE) {
-      $this->_debug("S: ".ldap_error($this->conn));
-      return false;
-    } // end if
-
-    $this->_debug("S: OK");
-
-    return base64_encode($dn);
-  }
-  
-  
-  /**
-   * Update a specific contact record
-   *
-   * @param mixed Record identifier
-   * @param array Hash array with save data
-   * @return boolean True on success, False on error
-   */
-  function update($id, $save_cols)
-  {
-    $record = $this->get_record($id, true);
-    $result = $this->get_result();
-    $record = $result->first();
-
-    $newdata = array();
-    $replacedata = array();
-    $deletedata = array();
-    foreach ($save_cols as $col => $val) {
-      $fld = $this->_map_field($col);
-      if ($fld) {
-        // The field does exist compare it to the ldap record.
-        if ($record[$col] != $val) {
-          // Changed, but find out how.
-          if (!isset($record[$col])) {
-            // Field was not set prior, need to add it.
-            $newdata[$fld] = $val;
-          } // end if
-          elseif ($val == '') {
-            // Field supplied is empty, verify that it is not required.
-            if (!in_array($fld, $this->prop['required_fields'])) {
-              // It is not, safe to clear.
-              $deletedata[$fld] = $record[$col];
-            } // end if
-          } // end elseif
-          else {
-            // The data was modified, save it out.
-            $replacedata[$fld] = $val;
-          } // end else
+        // See if the directory is writeable.
+        if ($this->prop['writable']) {
+            $this->readonly = false;
         } // end if
-      } // end if
-    } // end foreach
+    }
 
-    $dn = base64_decode($id);
 
-    // Update the entry as required.
-    if (!empty($deletedata)) {
-      // Delete the fields.
-      $this->_debug("C: Delete [dn: $dn]: ".print_r($deletedata, true));
-      if (!ldap_mod_del($this->conn, $dn, $deletedata)) {
-        $this->_debug("S: ".ldap_error($this->conn));
-        return false;
-      }
-      $this->_debug("S: OK");
-    } // end if
-
-    if (!empty($replacedata)) {
-      // Handle RDN change
-      if ($replacedata[$this->prop['LDAP_rdn']]) {
-        $newdn = $this->prop['LDAP_rdn'].'='
-         .rcube_ldap::quote_string($replacedata[$this->prop['LDAP_rdn']], true)
-         .','.$this->prop['base_dn']; 
-        if ($dn != $newdn) {
-          $newrdn = $this->prop['LDAP_rdn'].'='
-           .rcube_ldap::quote_string($replacedata[$this->prop['LDAP_rdn']], true);
-          unset($replacedata[$this->prop['LDAP_rdn']]);
-        }
-      }
-      // Replace the fields.
-      if (!empty($replacedata)) {
-        $this->_debug("C: Replace [dn: $dn]: ".print_r($replacedata, true));
-        if (!ldap_mod_replace($this->conn, $dn, $replacedata)) {
-          $this->_debug("S: ".ldap_error($this->conn));
-          return false;
-       }
-        $this->_debug("S: OK");
-      } // end if
-    } // end if
+    /**
+     * Bind connection with (SASL-) user and password
+     *
+     * @param string $authc Authentication user
+     * @param string $pass  Bind password
+     * @param string $authz Autorization user
+     *
+     * @return boolean True on success, False on error
+     */
+    private function _sasl_bind($authc, $pass, $authz=null)
+    {
+        if (!$this->conn) {
+            return false;
+        }
+
+        if (!function_exists('ldap_sasl_bind')) {
+            raise_error(array('code' => 100, 'type' => 'ldap',
+                'file' => __FILE__, 'line' => __LINE__,
+                'message' => "Unable to bind: ldap_sasl_bind() not exists"),
+                true, true);
+        }
+
+        if (!empty($authz)) {
+            $authz = 'u:' . $authz;
+        }
+
+        if (!empty($this->prop['auth_method'])) {
+            $method = $this->prop['auth_method'];
+        }
+        else {
+            $method = 'DIGEST-MD5';
+        }
+
+        $this->_debug("C: Bind [mech: $method, authc: $authc, authz: $authz] [pass: $pass]");
+
+        if (ldap_sasl_bind($this->conn, NULL, $pass, $method, NULL, $authc, $authz)) {
+            $this->_debug("S: OK");
+            return true;
+        }
 
-    if (!empty($newdata)) {
-      // Add the fields.
-      $this->_debug("C: Add [dn: $dn]: ".print_r($newdata, true));
-      if (!ldap_mod_add($this->conn, $dn, $newdata)) {
         $this->_debug("S: ".ldap_error($this->conn));
+
+        raise_error(array(
+            'code' => ldap_errno($this->conn), 'type' => 'ldap',
+            'file' => __FILE__, 'line' => __LINE__,
+            'message' => "Bind failed for authcid=$authc ".ldap_error($this->conn)),
+            true);
+
         return false;
-      }
-      $this->_debug("S: OK");
-    } // end if
-
-    // Handle RDN change
-    if (!empty($newrdn)) {
-      $this->_debug("C: Rename [dn: $dn] [dn: $newrdn]");
-      if (@ldap_rename($this->conn, $dn, $newrdn, NULL, TRUE)) {
-        $this->_debug("S: ".ldap_error($this->conn));
-        return base64_encode($newdn);
-      }
-      $this->_debug("S: OK");
-    }
-
-    return true;
-  }
-  
-  
-  /**
-   * Mark one or more contact records as deleted
-   *
-   * @param array  Record identifiers
-   * @return boolean True on success, False on error
-   */
-  function delete($ids)
-  {
-    if (!is_array($ids)) {
-      // Not an array, break apart the encoded DNs.
-      $dns = explode(',', $ids);
-    } // end if
-
-    foreach ($dns as $id) {
-      $dn = base64_decode($id);
-      $this->_debug("C: Delete [dn: $dn]");
-      // Delete the record.
-      $res = ldap_delete($this->conn, $dn);
-      if ($res === FALSE) {
+    }
+
+
+    /**
+     * Bind connection with DN and password
+     *
+     * @param string Bind DN
+     * @param string Bind password
+     *
+     * @return boolean True on success, False on error
+     */
+    private function _bind($dn, $pass)
+    {
+        if (!$this->conn) {
+            return false;
+        }
+
+        $this->_debug("C: Bind [dn: $dn] [pass: $pass]");
+
+        if (@ldap_bind($this->conn, $dn, $pass)) {
+            $this->_debug("S: OK");
+            return true;
+        }
+
         $this->_debug("S: ".ldap_error($this->conn));
+
+        raise_error(array(
+            'code' => ldap_errno($this->conn), 'type' => 'ldap',
+            'file' => __FILE__, 'line' => __LINE__,
+            'message' => "Bind failed for dn=$dn: ".ldap_error($this->conn)),
+            true);
+
         return false;
-      } // end if
-      $this->_debug("S: OK");
-    } // end foreach
+    }
+
+
+    /**
+     * Close connection to LDAP server
+     */
+    function close()
+    {
+        if ($this->conn)
+        {
+            $this->_debug("C: Close");
+            ldap_unbind($this->conn);
+            $this->conn = null;
+        }
+    }
+
+
+    /**
+     * Returns address book name
+     *
+     * @return string Address book name
+     */
+    function get_name()
+    {
+        return $this->prop['name'];
+    }
+
+
+    /**
+     * Set internal list page
+     *
+     * @param number $page Page number to list
+     */
+    function set_page($page)
+    {
+        $this->list_page = (int)$page;
+    }
+
+
+    /**
+     * Set internal page size
+     *
+     * @param number $size Number of messages to display on one page
+     */
+    function set_pagesize($size)
+    {
+        $this->page_size = (int)$size;
+    }
+
+
+    /**
+     * Save a search string for future listings
+     *
+     * @param string $filter Filter string
+     */
+    function set_search_set($filter)
+    {
+        $this->filter = $filter;
+    }
+
+
+    /**
+     * Getter for saved search properties
+     *
+     * @return mixed Search properties used by this class
+     */
+    function get_search_set()
+    {
+        return $this->filter;
+    }
+
+
+    /**
+     * Reset all saved results and search parameters
+     */
+    function reset()
+    {
+        $this->result = null;
+        $this->ldap_result = null;
+        $this->filter = '';
+    }
+
+
+    /**
+     * List the current set of contact records
+     *
+     * @param  array  List of cols to show
+     * @param  int    Only return this number of records
+     *
+     * @return array  Indexed list of contact records, each a hash array
+     */
+    function list_records($cols=null, $subset=0)
+    {
+        // add general filter to query
+        if (!empty($this->prop['filter']) && empty($this->filter))
+        {
+            $filter = $this->prop['filter'];
+            $this->set_search_set($filter);
+        }
+
+        // exec LDAP search if no result resource is stored
+        if ($this->conn && !$this->ldap_result)
+            $this->_exec_search();
+
+        // count contacts for this user
+        $this->result = $this->count();
+
+        // we have a search result resource
+        if ($this->ldap_result && $this->result->count > 0)
+        {
+            // sorting still on the ldap server
+            if ($this->sort_col && $this->prop['scope'] !== 'base' && !$this->vlv_active)
+                ldap_sort($this->conn, $this->ldap_result, $this->sort_col);
+
+            // start and end of the page
+            $start_row = $this->vlv_active ? 0 : $this->result->first;
+            $start_row = $subset < 0 ? $start_row + $this->page_size + $subset : $start_row;
+            $last_row = $this->result->first + $this->page_size;
+            $last_row = $subset != 0 ? $start_row + abs($subset) : $last_row;
+
+            // get all entries from the ldap server
+            $entries = ldap_get_entries($this->conn, $this->ldap_result);
+
+            // filtering for group members
+            if ($this->groups and $this->group_id)
+            {
+                $count = 0;
+                $members = array();
+                foreach ($entries as $entry)
+                {
+                    if ($this->group_members[self::dn_encode($entry['dn'])])
+                    {
+                        $members[] = $entry;
+                        $count++;
+                    }
+                }
+                $entries = $members;
+                $entries['count'] = $count;
+                $this->result->count = $count;
+            }
+
+            // filter entries for this page
+            for ($i = $start_row; $i < min($entries['count'], $last_row); $i++)
+                $this->result->add($this->_ldap2result($entries[$i]));
+        }
+        return $this->result;
+    }
+
+
+    /**
+     * Search contacts
+     *
+     * @param mixed   $fields   The field name of array of field names to search in
+     * @param mixed   $value    Search value (or array of values when $fields is array)
+     * @param boolean $strict   True for strict, False for partial (fuzzy) matching
+     * @param boolean $select   True if results are requested, False if count only
+     * @param boolean $nocount  (Not used)
+     * @param array   $required List of fields that cannot be empty
+     *
+     * @return array  Indexed list of contact records and 'count' value
+     */
+    function search($fields, $value, $strict=false, $select=true, $nocount=false, $required=array())
+    {
+        // special treatment for ID-based search
+        if ($fields == 'ID' || $fields == $this->primary_key)
+        {
+            $ids = !is_array($value) ? explode(',', $value) : $value;
+            $result = new rcube_result_set();
+            foreach ($ids as $id)
+            {
+                if ($rec = $this->get_record($id, true))
+                {
+                    $result->add($rec);
+                    $result->count++;
+                }
+            }
+            return $result;
+        }
+
+        // use AND operator for advanced searches
+        $filter = is_array($value) ? '(&' : '(|';
+        $wc     = !$strict && $this->prop['fuzzy_search'] ? '*' : '';
+
+        if ($fields == '*')
+        {
+            // search_fields are required for fulltext search
+            if (empty($this->prop['search_fields']))
+            {
+                $this->set_error(self::ERROR_SEARCH, 'nofulltextsearch');
+                $this->result = new rcube_result_set();
+                return $this->result;
+            }
+            if (is_array($this->prop['search_fields']))
+            {
+                foreach ($this->prop['search_fields'] as $field) {
+                    $filter .= "($field=$wc" . $this->_quote_string($value) . "$wc)";
+                }
+            }
+        }
+        else
+        {
+            foreach ((array)$fields as $idx => $field) {
+                $val = is_array($value) ? $value[$idx] : $value;
+                if ($f = $this->_map_field($field)) {
+                    $filter .= "($f=$wc" . $this->_quote_string($val) . "$wc)";
+                }
+            }
+        }
+        $filter .= ')';
+
+        // add required (non empty) fields filter
+        $req_filter = '';
+        foreach ((array)$required as $field)
+            if ($f = $this->_map_field($field))
+                $req_filter .= "($f=*)";
+
+        if (!empty($req_filter))
+            $filter = '(&' . $req_filter . $filter . ')';
+
+        // avoid double-wildcard if $value is empty
+        $filter = preg_replace('/\*+/', '*', $filter);
+
+        // add general filter to query
+        if (!empty($this->prop['filter']))
+            $filter = '(&(' . preg_replace('/^\(|\)$/', '', $this->prop['filter']) . ')' . $filter . ')';
+
+        // set filter string and execute search
+        $this->set_search_set($filter);
+        $this->_exec_search();
+
+        if ($select)
+            $this->list_records();
+        else
+            $this->result = $this->count();
+
+        return $this->result;
+    }
+
+
+    /**
+     * Count number of available contacts in database
+     *
+     * @return object rcube_result_set Resultset with values for 'count' and 'first'
+     */
+    function count()
+    {
+        $count = 0;
+        if ($this->conn && $this->ldap_result) {
+            $count = $this->vlv_active ? $this->vlv_count : ldap_count_entries($this->conn, $this->ldap_result);
+        } // end if
+        elseif ($this->conn) {
+            // We have a connection but no result set, attempt to get one.
+            if (empty($this->filter)) {
+                // The filter is not set, set it.
+                $this->filter = $this->prop['filter'];
+            } // end if
+            $this->_exec_search(true);
+            if ($this->ldap_result) {
+                $count = ldap_count_entries($this->conn, $this->ldap_result);
+            } // end if
+        } // end else
+
+        return new rcube_result_set($count, ($this->list_page-1) * $this->page_size);
+    }
+
+
+    /**
+     * Return the last result set
+     *
+     * @return object rcube_result_set Current resultset or NULL if nothing selected yet
+     */
+    function get_result()
+    {
+        return $this->result;
+    }
+
+
+    /**
+     * Get a specific contact record
+     *
+     * @param mixed   Record identifier
+     * @param boolean Return as associative array
+     *
+     * @return mixed  Hash array or rcube_result_set with all record fields
+     */
+    function get_record($dn, $assoc=false)
+    {
+        $res = null;
+        if ($this->conn && $dn)
+        {
+            $dn = self::dn_decode($dn);
+
+            $this->_debug("C: Read [dn: $dn] [(objectclass=*)]");
+
+            if ($this->ldap_result = @ldap_read($this->conn, $dn, '(objectclass=*)', array_values($this->fieldmap)))
+                $entry = ldap_first_entry($this->conn, $this->ldap_result);
+            else
+                $this->_debug("S: ".ldap_error($this->conn));
+
+            if ($entry && ($rec = ldap_get_attributes($this->conn, $entry)))
+            {
+                $this->_debug("S: OK"/* . print_r($rec, true)*/);
+
+                $rec = array_change_key_case($rec, CASE_LOWER);
+
+                // Add in the dn for the entry.
+                $rec['dn'] = $dn;
+                $res = $this->_ldap2result($rec);
+                $this->result = new rcube_result_set(1);
+                $this->result->add($res);
+            }
+        }
+
+        return $assoc ? $res : $this->result;
+    }
+
+
+    /**
+     * Check the given data before saving.
+     * If input not valid, the message to display can be fetched using get_error()
+     *
+     * @param array Assoziative array with data to save
+     *
+     * @return boolean True if input is valid, False if not.
+     */
+    public function validate($save_data)
+    {
+        // check for name input
+        if (empty($save_data['name'])) {
+            $this->set_error('warning', 'nonamewarning');
+            return false;
+        }
+
+        // validate e-mail addresses
+        return parent::validate($save_data);
+    }
+
+
+    /**
+     * Create a new contact record
+     *
+     * @param array    Hash array with save data
+     *
+     * @return encoded record ID on success, False on error
+     */
+    function insert($save_cols)
+    {
+        // Map out the column names to their LDAP ones to build the new entry.
+        $newentry = array();
+        $newentry['objectClass'] = $this->prop['LDAP_Object_Classes'];
+        foreach ($this->fieldmap as $col => $fld) {
+            $val = $save_cols[$col];
+            if (is_array($val))
+                $val = array_filter($val);  // remove empty entries
+            if ($fld && $val) {
+                // The field does exist, add it to the entry.
+                $newentry[$fld] = $val;
+            } // end if
+        } // end foreach
+
+        // Verify that the required fields are set.
+        $missing = null;
+        foreach ($this->prop['required_fields'] as $fld) {
+            if (!isset($newentry[$fld])) {
+                $missing[] = $fld;
+            }
+        }
+
+        // abort process if requiered fields are missing
+        // TODO: generate message saying which fields are missing
+        if ($missing) {
+            $this->set_error(self::ERROR_INCOMPLETE, 'formincomplete');
+            return false;
+        }
+
+        // Build the new entries DN.
+        $dn = $this->prop['LDAP_rdn'].'='.$this->_quote_string($newentry[$this->prop['LDAP_rdn']], true).','.$this->base_dn;
+
+        $this->_debug("C: Add [dn: $dn]: ".print_r($newentry, true));
+
+        $res = ldap_add($this->conn, $dn, $newentry);
+        if ($res === FALSE) {
+            $this->_debug("S: ".ldap_error($this->conn));
+            $this->set_error(self::ERROR_SAVING, 'errorsaving');
+            return false;
+        } // end if
+
+        $this->_debug("S: OK");
+
+        $dn = self::dn_encode($dn);
+
+        // add new contact to the selected group
+        if ($this->groups)
+            $this->add_to_group($this->group_id, $dn);
+
+        return $dn;
+    }
+
+
+    /**
+     * Update a specific contact record
+     *
+     * @param mixed Record identifier
+     * @param array Hash array with save data
+     *
+     * @return boolean True on success, False on error
+     */
+    function update($id, $save_cols)
+    {
+        $record = $this->get_record($id, true);
+        $result = $this->get_result();
+        $record = $result->first();
+
+        $newdata = array();
+        $replacedata = array();
+        $deletedata = array();
+
+        // flatten composite fields in $record
+        if (is_array($record['address'])) {
+          foreach ($record['address'] as $i => $struct) {
+            foreach ($struct as $col => $val) {
+              $record[$col][$i] = $val;
+            }
+          }
+        }
+
+        foreach ($this->fieldmap as $col => $fld) {
+            $val = $save_cols[$col];
+            if ($fld) {
+                // remove empty array values
+                if (is_array($val))
+                    $val = array_filter($val);
+                // The field does exist compare it to the ldap record.
+                if ($record[$col] != $val) {
+                    // Changed, but find out how.
+                    if (!isset($record[$col])) {
+                        // Field was not set prior, need to add it.
+                        $newdata[$fld] = $val;
+                    } // end if
+                    elseif ($val == '') {
+                        // Field supplied is empty, verify that it is not required.
+                        if (!in_array($fld, $this->prop['required_fields'])) {
+                            // It is not, safe to clear.
+                            $deletedata[$fld] = $record[$col];
+                        } // end if
+                    } // end elseif
+                    else {
+                        // The data was modified, save it out.
+                        $replacedata[$fld] = $val;
+                    } // end else
+                } // end if
+            } // end if
+        } // end foreach
+
+        $dn = self::dn_decode($id);
+
+        // Update the entry as required.
+        if (!empty($deletedata)) {
+            // Delete the fields.
+            $this->_debug("C: Delete [dn: $dn]: ".print_r($deletedata, true));
+            if (!ldap_mod_del($this->conn, $dn, $deletedata)) {
+                $this->_debug("S: ".ldap_error($this->conn));
+                $this->set_error(self::ERROR_SAVING, 'errorsaving');
+                return false;
+            }
+            $this->_debug("S: OK");
+        } // end if
+
+        if (!empty($replacedata)) {
+            // Handle RDN change
+            if ($replacedata[$this->prop['LDAP_rdn']]) {
+                $newdn = $this->prop['LDAP_rdn'].'='
+                    .$this->_quote_string($replacedata[$this->prop['LDAP_rdn']], true)
+                    .','.$this->base_dn;
+                if ($dn != $newdn) {
+                    $newrdn = $this->prop['LDAP_rdn'].'='
+                    .$this->_quote_string($replacedata[$this->prop['LDAP_rdn']], true);
+                    unset($replacedata[$this->prop['LDAP_rdn']]);
+                }
+            }
+            // Replace the fields.
+            if (!empty($replacedata)) {
+                $this->_debug("C: Replace [dn: $dn]: ".print_r($replacedata, true));
+                if (!ldap_mod_replace($this->conn, $dn, $replacedata)) {
+                    $this->_debug("S: ".ldap_error($this->conn));
+                    return false;
+                }
+                $this->_debug("S: OK");
+            } // end if
+        } // end if
+
+        if (!empty($newdata)) {
+            // Add the fields.
+            $this->_debug("C: Add [dn: $dn]: ".print_r($newdata, true));
+            if (!ldap_mod_add($this->conn, $dn, $newdata)) {
+                $this->_debug("S: ".ldap_error($this->conn));
+                $this->set_error(self::ERROR_SAVING, 'errorsaving');
+                return false;
+            }
+            $this->_debug("S: OK");
+        } // end if
+
+        // Handle RDN change
+        if (!empty($newrdn)) {
+            $this->_debug("C: Rename [dn: $dn] [dn: $newrdn]");
+            if (!ldap_rename($this->conn, $dn, $newrdn, NULL, TRUE)) {
+                $this->_debug("S: ".ldap_error($this->conn));
+                return false;
+            }
+            $this->_debug("S: OK");
+
+            $dn    = self::dn_encode($dn);
+            $newdn = self::dn_encode($newdn);
+
+            // change the group membership of the contact
+            if ($this->groups)
+            {
+                $group_ids = $this->get_record_groups($dn);
+                foreach ($group_ids as $group_id)
+                {
+                    $this->remove_from_group($group_id, $dn);
+                    $this->add_to_group($group_id, $newdn);
+                }
+            }
+
+            return $newdn;
+        }
 
-    return count($dns);
-  }
+        return true;
+    }
 
 
-  /**
-   * Execute the LDAP search based on the stored credentials
-   *
-   * @access private
-   */
-  private function _exec_search()
-  {
-    if ($this->ready)
+    /**
+     * Mark one or more contact records as deleted
+     *
+     * @param array   Record identifiers
+     * @param boolean Remove record(s) irreversible (unsupported)
+     *
+     * @return boolean True on success, False on error
+     */
+    function delete($ids, $force=true)
     {
-      $filter = $this->filter ? $this->filter : '(objectclass=*)';
-      $function = $this->prop['scope'] == 'sub' ? 'ldap_search' : ($this->prop['scope'] == 'base' ? 'ldap_read' : 'ldap_list');
+        if (!is_array($ids)) {
+            // Not an array, break apart the encoded DNs.
+            $ids = explode(',', $ids);
+        } // end if
+
+        foreach ($ids as $id) {
+            $dn = self::dn_decode($id);
+            $this->_debug("C: Delete [dn: $dn]");
+            // Delete the record.
+            $res = ldap_delete($this->conn, $dn);
+            if ($res === FALSE) {
+                $this->_debug("S: ".ldap_error($this->conn));
+                $this->set_error(self::ERROR_SAVING, 'errorsaving');
+                return false;
+            } // end if
+            $this->_debug("S: OK");
+
+            // remove contact from all groups where he was member
+            if ($this->groups) {
+                $dn = self::dn_encode($dn);
+                $group_ids = $this->get_record_groups($dn);
+                foreach ($group_ids as $group_id) {
+                    $this->remove_from_group($group_id, $dn);
+                }
+            }
+        } // end foreach
+
+        return count($ids);
+    }
 
-      $this->_debug("C: Search [".$filter."]");
 
-      if ($this->ldap_result = @$function($this->conn, $this->prop['base_dn'], $filter,
-          array_values($this->fieldmap), 0, (int) $this->prop['sizelimit'], (int) $this->prop['timelimit'])
-      ) {
-        $this->_debug("S: ".ldap_count_entries($this->conn, $this->ldap_result)." record(s)");
+    /**
+     * Execute the LDAP search based on the stored credentials
+     */
+    private function _exec_search($count = false)
+    {
+        if ($this->ready)
+        {
+            $filter = $this->filter ? $this->filter : '(objectclass=*)';
+            $function = $this->prop['scope'] == 'sub' ? 'ldap_search' : ($this->prop['scope'] == 'base' ? 'ldap_read' : 'ldap_list');
+
+            $this->_debug("C: Search [$filter]");
+
+            // when using VLV, we get the total count by...
+            if (!$count && $function != 'ldap_read' && $this->prop['vlv']) {
+                // ...either reading numSubOrdinates attribute
+                if ($this->prop['numsub_filter'] && ($result_count = @$function($this->conn, $this->base_dn, $this->prop['numsub_filter'], array('numSubOrdinates'), 0, 0, 0))) {
+                    $counts = ldap_get_entries($this->conn, $result_count);
+                    for ($this->vlv_count = $j = 0; $j < $counts['count']; $j++)
+                        $this->vlv_count += $counts[$j]['numsubordinates'][0];
+                    $this->_debug("D: total numsubordinates = " . $this->vlv_count);
+                }
+                else  // ...or by fetching all records dn and count them
+                    $this->vlv_count = $this->_exec_search(true);
+
+                $this->vlv_active = $this->_vlv_set_controls();
+            }
+
+            // only fetch dn for count (should keep the payload low)
+            $attrs = $count ? array('dn') : array_values($this->fieldmap);
+            if ($this->ldap_result = @$function($this->conn, $this->base_dn, $filter,
+                $attrs, 0, (int)$this->prop['sizelimit'], (int)$this->prop['timelimit']))
+            {
+                $this->_debug("S: ".ldap_count_entries($this->conn, $this->ldap_result)." record(s)");
+                if ($err = ldap_errno($this->conn))
+                    $this->_debug("S: Error: " .ldap_err2str($err));
+                return true;
+            }
+            else
+            {
+                $this->_debug("S: ".ldap_error($this->conn));
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Set server controls for Virtual List View (paginated listing)
+     */
+    private function _vlv_set_controls()
+    {
+        $sort_ctrl = array('oid' => "1.2.840.113556.1.4.473",  'value' => $this->_sort_ber_encode((array)$this->prop['sort']));
+        $vlv_ctrl  = array('oid' => "2.16.840.1.113730.3.4.9", 'value' => $this->_vlv_ber_encode(($offset = ($this->list_page-1) * $this->page_size + 1), $this->page_size), 'iscritical' => true);
+
+        $this->_debug("C: set controls sort=" . join(' ', unpack('H'.(strlen($sort_ctrl['value'])*2), $sort_ctrl['value'])) . " ({$this->sort_col});"
+            . " vlv=" . join(' ', (unpack('H'.(strlen($vlv_ctrl['value'])*2), $vlv_ctrl['value']))) . " ($offset)");
+
+        if (!ldap_set_option($this->conn, LDAP_OPT_SERVER_CONTROLS, array($sort_ctrl, $vlv_ctrl))) {
+            $this->_debug("S: ".ldap_error($this->conn));
+            $this->set_error(self::ERROR_SEARCH, 'vlvnotsupported');
+            return false;
+        }
+
         return true;
-      } else
-        $this->_debug("S: ".ldap_error($this->conn));
     }
-    
-    return false;
-  }
-  
-  
-  /**
-   * @access private
-   */
-  private function _ldap2result($rec)
-  {
-    global $RCMAIL;
-
-    $out = array();
-    
-    if ($rec['dn'])
-      $out[$this->primary_key] = base64_encode($rec['dn']);
-    
-    foreach ($this->fieldmap as $rf => $lf)
-    {
-      if ($rec[$lf]['count']) {
-        if ($rf == 'email' && $this->mail_domain && !strpos($rec[$lf][0], '@'))
-          $out[$rf] = sprintf('%s@%s', $rec[$lf][0], $this->mail_domain);
+
+
+    /**
+     * Converts LDAP entry into an array
+     */
+    private function _ldap2result($rec)
+    {
+        $out = array();
+
+        if ($rec['dn'])
+            $out[$this->primary_key] = self::dn_encode($rec['dn']);
+
+        foreach ($this->fieldmap as $rf => $lf)
+        {
+            for ($i=0; $i < $rec[$lf]['count']; $i++) {
+                if (!($value = $rec[$lf][$i]))
+                    continue;
+                if ($rf == 'email' && $this->mail_domain && !strpos($value, '@'))
+                    $out[$rf][] = sprintf('%s@%s', $value, $this->mail_domain);
+                else if (in_array($rf, array('street','zipcode','locality','country','region')))
+                    $out['address'][$i][$rf] = $value;
+                else if ($rec[$lf]['count'] > 1)
+                    $out[$rf][] = $value;
+                else
+                    $out[$rf] = $value;
+            }
+        }
+
+        return $out;
+    }
+
+
+    /**
+     * Return real field name (from fields map)
+     */
+    private function _map_field($field)
+    {
+        return $this->fieldmap[$field];
+    }
+
+
+    /**
+     * Returns unified attribute name (resolving aliases)
+     */
+    private static function _attr_name($name)
+    {
+        // list of known attribute aliases
+        $aliases = array(
+            'gn' => 'givenname',
+            'rfc822mailbox' => 'email',
+            'userid' => 'uid',
+            'emailaddress' => 'email',
+            'pkcs9email' => 'email',
+        );
+        return isset($aliases[$name]) ? $aliases[$name] : $name;
+    }
+
+
+    /**
+     * Prints debug info to the log
+     */
+    private function _debug($str)
+    {
+        if ($this->debug)
+            write_log('ldap', $str);
+    }
+
+
+    /**
+     * Quotes attribute value string
+     *
+     * @param string $str Attribute value
+     * @param bool   $dn  True if the attribute is a DN
+     *
+     * @return string Quoted string
+     */
+    private static function _quote_string($str, $dn=false)
+    {
+        // take firt entry if array given
+        if (is_array($str))
+            $str = reset($str);
+
+        if ($dn)
+            $replace = array(','=>'\2c', '='=>'\3d', '+'=>'\2b', '<'=>'\3c',
+                '>'=>'\3e', ';'=>'\3b', '\\'=>'\5c', '"'=>'\22', '#'=>'\23');
         else
-          $out[$rf] = $rec[$lf][0];
-      }
-    }
-    
-    return $out;
-  }
-  
-  
-  /**
-   * @access private
-   */
-  private function _map_field($field)
-  {
-    return $this->fieldmap[$field];
-  }
-  
-  
-  /**
-   * @access private
-   */
-  private function _attr_name($name)
-  {
-    // list of known attribute aliases
-    $aliases = array(
-      'gn' => 'givenname',
-      'rfc822mailbox' => 'email',
-      'userid' => 'uid',
-      'emailaddress' => 'email',
-      'pkcs9email' => 'email',
-    );
-    return isset($aliases[$name]) ? $aliases[$name] : $name;
-  }
-
-
-  /**
-   * @access private
-   */
-  private function _debug($str)
-  {
-    if ($this->debug)
-      write_log('ldap', $str);
-  }
-  
-
-  /**
-   * @static
-   */
-  function quote_string($str, $dn=false)
-  {
-    if ($dn)
-      $replace = array(','=>'\2c', '='=>'\3d', '+'=>'\2b', '<'=>'\3c',
-        '>'=>'\3e', ';'=>'\3b', '\\'=>'\5c', '"'=>'\22', '#'=>'\23');
-    else
-      $replace = array('*'=>'\2a', '('=>'\28', ')'=>'\29', '\\'=>'\5c',
-        '/'=>'\2f');
-
-    return strtr($str, $replace);
-  }
+            $replace = array('*'=>'\2a', '('=>'\28', ')'=>'\29', '\\'=>'\5c',
+                '/'=>'\2f');
 
-}
+        return strtr($str, $replace);
+    }
+
+
+    /**
+     * Setter for the current group
+     * (empty, has to be re-implemented by extending class)
+     */
+    function set_group($group_id)
+    {
+        if ($group_id)
+        {
+            if (!$this->group_cache)
+                $this->list_groups();
+
+            $cache_members = $this->group_cache[$group_id]['members'];
 
+            $members = array();
+            for ($i=0; $i<$cache_members["count"]; $i++)
+            {
+                if (!empty($cache_members[$i]))
+                    $members[self::dn_encode($cache_members[$i])] = 1;
+            }
+            $this->group_members = $members;
+            $this->group_id = $group_id;
+        }
+        else
+            $this->group_id = 0;
+    }
+
+    /**
+     * List all active contact groups of this source
+     *
+     * @param string  Optional search string to match group name
+     * @return array  Indexed list of contact groups, each a hash array
+     */
+    function list_groups($search = null)
+    {
+        if (!$this->groups)
+            return array();
+
+        $base_dn = $this->groups_base_dn;
+        $filter = $this->prop['groups']['filter'];
+
+        $this->_debug("C: Search [$filter][dn: $base_dn]");
+
+        $res = @ldap_search($this->conn, $base_dn, $filter, array('cn', $this->prop['member_attr']));
+        if ($res === false)
+        {
+            $this->_debug("S: ".ldap_error($this->conn));
+            return array();
+        }
+
+        $ldap_data = ldap_get_entries($this->conn, $res);
+        $this->_debug("S: ".ldap_count_entries($this->conn, $res)." record(s)");
+
+        $groups = array();
+        $group_sortnames = array();
+        for ($i=0; $i<$ldap_data["count"]; $i++)
+        {
+            $group_name = $ldap_data[$i]['cn'][0];
+            if (!$search || strstr(strtolower($group_name), strtolower($search)))
+            {
+                $group_id = self::dn_encode($group_name);
+                $groups[$group_id]['ID'] = $group_id;
+                $groups[$group_id]['name'] = $group_name;
+                $groups[$group_id]['members'] = $ldap_data[$i][$this->prop['member_attr']];
+                $group_sortnames[] = strtolower($group_name);
+            }
+        }
+        array_multisort($group_sortnames, SORT_ASC, SORT_STRING, $groups);
+        $this->group_cache = $groups;
+
+        return $groups;
+    }
+
+    /**
+     * Create a contact group with the given name
+     *
+     * @param string The group name
+     * @return mixed False on error, array with record props in success
+     */
+    function create_group($group_name)
+    {
+        if (!$this->group_cache)
+            $this->list_groups();
+
+        $base_dn = $this->groups_base_dn;
+        $new_dn = "cn=$group_name,$base_dn";
+        $new_gid = self::dn_encode($group_name);
+
+        $new_entry = array(
+            'objectClass' => $this->prop['groups']['object_classes'],
+            'cn' => $group_name,
+            $this->prop['member_attr'] => '',
+        );
+
+        $this->_debug("C: Add [dn: $new_dn]: ".print_r($new_entry, true));
+
+        $res = ldap_add($this->conn, $new_dn, $new_entry);
+        if ($res === false)
+        {
+            $this->_debug("S: ".ldap_error($this->conn));
+            $this->set_error(self::ERROR_SAVING, 'errorsaving');
+            return false;
+        }
+
+        $this->_debug("S: OK");
+
+        return array('id' => $new_gid, 'name' => $group_name);
+    }
+
+    /**
+     * Delete the given group and all linked group members
+     *
+     * @param string Group identifier
+     * @return boolean True on success, false if no data was changed
+     */
+    function delete_group($group_id)
+    {
+        if (!$this->group_cache)
+            $this->list_groups();
+
+        $base_dn = $this->groups_base_dn;
+        $group_name = $this->group_cache[$group_id]['name'];
+        $del_dn = "cn=$group_name,$base_dn";
+
+        $this->_debug("C: Delete [dn: $del_dn]");
+
+        $res = ldap_delete($this->conn, $del_dn);
+        if ($res === false)
+        {
+            $this->_debug("S: ".ldap_error($this->conn));
+            $this->set_error(self::ERROR_SAVING, 'errorsaving');
+            return false;
+        }
+
+        $this->_debug("S: OK");
+
+        return true;
+    }
+
+    /**
+     * Rename a specific contact group
+     *
+     * @param string Group identifier
+     * @param string New name to set for this group
+     * @param string New group identifier (if changed, otherwise don't set)
+     * @return boolean New name on success, false if no data was changed
+     */
+    function rename_group($group_id, $new_name, &$new_gid)
+    {
+        if (!$this->group_cache)
+            $this->list_groups();
+
+        $base_dn = $this->groups_base_dn;
+        $group_name = $this->group_cache[$group_id]['name'];
+        $old_dn = "cn=$group_name,$base_dn";
+        $new_rdn = "cn=$new_name";
+        $new_gid = self::dn_encode($new_name);
+
+        $this->_debug("C: Rename [dn: $old_dn] [dn: $new_rdn]");
+
+        $res = ldap_rename($this->conn, $old_dn, $new_rdn, NULL, TRUE);
+        if ($res === false)
+        {
+            $this->_debug("S: ".ldap_error($this->conn));
+            $this->set_error(self::ERROR_SAVING, 'errorsaving');
+            return false;
+        }
+
+        $this->_debug("S: OK");
+
+        return $new_name;
+    }
+
+    /**
+     * Add the given contact records the a certain group
+     *
+     * @param string  Group identifier
+     * @param array   List of contact identifiers to be added
+     * @return int    Number of contacts added
+     */
+    function add_to_group($group_id, $contact_ids)
+    {
+        if (!$this->group_cache)
+            $this->list_groups();
+
+        $base_dn     = $this->groups_base_dn;
+        $group_name  = $this->group_cache[$group_id]['name'];
+        $member_attr = $this->prop['member_attr'];
+        $group_dn    = "cn=$group_name,$base_dn";
+
+        $new_attrs = array();
+        foreach (explode(",", $contact_ids) as $id)
+            $new_attrs[$member_attr][] = self::dn_decode($id);
+
+        $this->_debug("C: Add [dn: $group_dn]: ".print_r($new_attrs, true));
+
+        $res = ldap_mod_add($this->conn, $group_dn, $new_attrs);
+        if ($res === false)
+        {
+            $this->_debug("S: ".ldap_error($this->conn));
+            $this->set_error(self::ERROR_SAVING, 'errorsaving');
+            return 0;
+        }
+
+        $this->_debug("S: OK");
+
+        return count($new_attrs['member']);
+    }
+
+    /**
+     * Remove the given contact records from a certain group
+     *
+     * @param string  Group identifier
+     * @param array   List of contact identifiers to be removed
+     * @return int    Number of deleted group members
+     */
+    function remove_from_group($group_id, $contact_ids)
+    {
+        if (!$this->group_cache)
+            $this->list_groups();
+
+        $base_dn     = $this->groups_base_dn;
+        $group_name  = $this->group_cache[$group_id]['name'];
+        $member_attr = $this->prop['member_attr'];
+        $group_dn    = "cn=$group_name,$base_dn";
+
+        $del_attrs = array();
+        foreach (explode(",", $contact_ids) as $id)
+            $del_attrs[$member_attr][] = self::dn_decode($id);
+
+        $this->_debug("C: Delete [dn: $group_dn]: ".print_r($del_attrs, true));
+
+        $res = ldap_mod_del($this->conn, $group_dn, $del_attrs);
+        if ($res === false)
+        {
+            $this->_debug("S: ".ldap_error($this->conn));
+            $this->set_error(self::ERROR_SAVING, 'errorsaving');
+            return 0;
+        }
+
+        $this->_debug("S: OK");
+
+        return count($del_attrs['member']);
+    }
+
+    /**
+     * Get group assignments of a specific contact record
+     *
+     * @param mixed Record identifier
+     *
+     * @return array List of assigned groups as ID=>Name pairs
+     * @since 0.5-beta
+     */
+    function get_record_groups($contact_id)
+    {
+        if (!$this->groups)
+            return array();
+
+        $base_dn     = $this->groups_base_dn;
+        $contact_dn  = self::dn_decode($contact_id);
+        $member_attr = $this->prop['member_attr'];
+        $filter      = strtr("($member_attr=$contact_dn)", array('\\' => '\\\\'));
+
+        $this->_debug("C: Search [$filter][dn: $base_dn]");
+
+        $res = @ldap_search($this->conn, $base_dn, $filter, array('cn'));
+        if ($res === false)
+        {
+            $this->_debug("S: ".ldap_error($this->conn));
+            return array();
+        }
+        $ldap_data = ldap_get_entries($this->conn, $res);
+        $this->_debug("S: ".ldap_count_entries($this->conn, $res)." record(s)");
+
+        $groups = array();
+        for ($i=0; $i<$ldap_data["count"]; $i++)
+        {
+            $group_name = $ldap_data[$i]['cn'][0];
+            $group_id = self::dn_encode($group_name);
+            $groups[$group_id] = $group_id;
+        }
+        return $groups;
+    }
+
+
+    /**
+     * Generate BER encoded string for Virtual List View option
+     *
+     * @param integer List offset (first record)
+     * @param integer Records per page
+     * @return string BER encoded option value
+     */
+    private function _vlv_ber_encode($offset, $rpp)
+    {
+        # this string is ber-encoded, php will prefix this value with:
+        # 04 (octet string) and 10 (length of 16 bytes)
+        # the code behind this string is broken down as follows:
+        # 30 = ber sequence with a length of 0e (14) bytes following
+        # 20 = type integer (in two's complement form) with 2 bytes following (beforeCount): 01 00 (ie 0)
+        # 20 = type integer (in two's complement form) with 2 bytes following (afterCount):  01 18 (ie 25-1=24)
+        # a0 = type context-specific/constructed with a length of 06 (6) bytes following
+        # 20 = type integer with 2 bytes following (offset): 01 01 (ie 1)
+        # 20 = type integer with 2 bytes following (contentCount):  01 00
+        # the following info was taken from the ISO/IEC 8825-1:2003 x.690 standard re: the
+        # encoding of integer values (note: these values are in
+        # two-complement form so since offset will never be negative bit 8 of the
+        # leftmost octet should never by set to 1):
+        # 8.3.2: If the contents octets of an integer value encoding consist
+        # of more than one octet, then the bits of the first octet (rightmost) and bit 8
+        # of the second (to the left of first octet) octet:
+        # a) shall not all be ones; and
+        # b) shall not all be zero
+
+        # construct the string from right to left
+        $str = "020100"; # contentCount
+
+        $ber_val = self::_ber_encode_int($offset);  // returns encoded integer value in hex format
+
+        // calculate octet length of $ber_val
+        $str = self::_ber_addseq($ber_val, '02') . $str;
+
+        // now compute length over $str
+        $str = self::_ber_addseq($str, 'a0');
+
+        // now tack on records per page
+        $str = sprintf("0201000201%02x", min(255, $rpp)-1) . $str;
+
+        // now tack on sequence identifier and length
+        $str = self::_ber_addseq($str, '30');
+
+        return pack('H'.strlen($str), $str);
+    }
+
+
+    /**
+     * create ber encoding for sort control
+     *
+     * @param array List of cols to sort by
+     * @return string BER encoded option value
+     */
+    private function _sort_ber_encode($sortcols)
+    {
+        $str = '';
+        foreach (array_reverse((array)$sortcols) as $col) {
+            $ber_val = self::_string2hex($col);
+
+            # 30 = ber sequence with a length of octet value
+            # 04 = octet string with a length of the ascii value
+            $oct = self::_ber_addseq($ber_val, '04');
+            $str = self::_ber_addseq($oct, '30') . $str;
+        }
+
+        // now tack on sequence identifier and length
+        $str = self::_ber_addseq($str, '30');
+
+        return pack('H'.strlen($str), $str);
+    }
+
+    /**
+     * Add BER sequence with correct length and the given identifier
+     */
+    private static function _ber_addseq($str, $identifier)
+    {
+        $len = dechex(strlen($str)/2);
+        if (strlen($len) % 2 != 0)
+            $len = '0'.$len;
+
+        return $identifier . $len . $str;
+    }
+
+    /**
+     * Returns BER encoded integer value in hex format
+     */
+    private static function _ber_encode_int($offset)
+    {
+        $val = dechex($offset);
+        $prefix = '';
+
+        // check if bit 8 of high byte is 1
+        if (preg_match('/^[89abcdef]/', $val))
+            $prefix = '00';
+
+        if (strlen($val)%2 != 0)
+            $prefix .= '0';
+
+        return $prefix . $val;
+    }
+
+    /**
+     * Returns ascii string encoded in hex
+     */
+    private static function _string2hex($str)
+    {
+        $hex = '';
+        for ($i=0; $i < strlen($str); $i++)
+            $hex .= dechex(ord($str[$i]));
+        return $hex;
+    }
+
+    /**
+     * HTML-safe DN string encoding
+     *
+     * @param string $str DN string
+     *
+     * @return string Encoded HTML identifier string
+     */
+    static function dn_encode($str)
+    {
+        // @TODO: to make output string shorter we could probably
+        //        remove dc=* items from it
+        return rtrim(strtr(base64_encode($str), '+/', '-_'), '=');
+    }
+
+    /**
+     * Decodes DN string encoded with _dn_encode()
+     *
+     * @param string $str Encoded HTML identifier string
+     *
+     * @return string DN string
+     */
+    static function dn_decode($str)
+    {
+        $str = str_pad(strtr($str, '-_', '+/'), strlen($str) % 4, '=', STR_PAD_RIGHT);
+        return base64_decode($str);
+    }
+}