Use Net_LDAP3

4 files changed, 2737 insertions, 903 deletions

diff --git a/program/lib/Net/LDAP3.php b/program/lib/Net/LDAP3.php
new file mode 100644
index 000000000..b101b4afc
--- /dev/null
+++ b/program/lib/Net/LDAP3.php
@@ -0,0 +1,2615 @@
+<?php
+/*
+ +-----------------------------------------------------------------------+
+ | Net/LDAP3.php                                                         |
+ |                                                                       |
+ | Based on code created by the Roundcube Webmail team.                  |
+ |                                                                       |
+ | Copyright (C) 2006-2014, The Roundcube Dev Team                       |
+ | Copyright (C) 2012-2014, Kolab Systems AG                             |
+ |                                                                       |
+ | Licensed under the GNU General Public License version 3 or            |
+ | any later version with exceptions for plugins.                        |
+ | See the README file for a full license statement.                     |
+ |                                                                       |
+ | PURPOSE:                                                              |
+ |   Provide advanced functionality for accessing LDAP directories       |
+ |                                                                       |
+ +-----------------------------------------------------------------------+
+ | Authors: Thomas Bruederli <roundcube@gmail.com>                       |
+ |          Aleksander Machniak <machniak@kolabsys.com>                  |
+ |          Jeroen van Meeuwen <vanmeeuwen@kolabsys.com>                 |
+ +-----------------------------------------------------------------------+
+*/
+
+require_once __DIR__ . '/LDAP3/Result.php';
+
+/**
+ * Model class to access a LDAP directories
+ *
+ * @package Net_LDAP3
+ */
+class Net_LDAP3
+{
+    public $conn;
+    public $vlv_active = false;
+
+    private $attribute_level_rights_map = array(
+        "r" => "read",
+        "s" => "search",
+        "w" => "write",
+        "o" => "delete",
+        "c" => "compare",
+        "W" => "write",
+        "O" => "delete"
+    );
+
+    private $entry_level_rights_map = array(
+        "a" => "add",
+        "d" => "delete",
+        "n" => "modrdn",
+        "v" => "read"
+    );
+
+    /*
+     * Manipulate configuration through the config_set and config_get methods.
+     * Available options:
+     *       'debug'           => false,
+     *       'hosts'           => array(),
+     *       'port'            => 389,
+     *       'use_tls'         => false,
+     *       'ldap_version'    => 3,        // using LDAPv3
+     *       'auth_method'     => '',       // SASL authentication method (for proxy auth), e.g. DIGEST-MD5
+     *       'numsub_filter'   => '(objectClass=organizationalUnit)', // with VLV, we also use numSubOrdinates to query the total number of records. Set this filter to get all numSubOrdinates attributes for counting
+     *       'referrals'       => false,    // Sets the LDAP_OPT_REFERRALS option. Mostly used in multi-domain Active Directory setups
+     *       'network_timeout' => 10,       // The timeout (in seconds) for connect + bind arrempts. This is only supported in PHP >= 5.3.0 with OpenLDAP 2.x
+     *       'sizelimit'       => 0,        // Enables you to limit the count of entries fetched. Setting this to 0 means no limit.
+     *       'timelimit'       => 0,        // Sets the number of seconds how long is spend on the search. Setting this to 0 means no limit.
+     *       'vlv'             => false,    // force VLV off
+     *       'config_root_dn'  => 'cn=config',  // Root DN to read config (e.g. vlv indexes) from
+     *       'service_bind_dn' => 'uid=kolab-service,ou=Special Users,dc=example,dc=org',
+     *       'service_bind_pw' => 'Welcome2KolabSystems',
+     *       'root_dn'         => 'dc=example,dc=org',
+     */
+    protected $config = array(
+        'sizelimit' => 0,
+        'timelimit' => 0,
+    );
+
+    protected $debug_level = false;
+    protected $list_page   = 1;
+    protected $page_size   = 10;
+    protected $cache;
+
+    // Use public method config_set('log_hook', $callback) to have $callback be
+    // call_user_func'ed instead of the local log functions.
+    protected $_log_hook;
+
+    // Use public method config_set('config_get_hook', $callback) to have
+    // $callback be call_user_func'ed instead of the local config_get function.
+    protected $_config_get_hook;
+
+    // Use public method config_set('config_set_hook', $callback) to have
+    // $callback be call_user_func'ed instead of the local config_set function.
+    protected $_config_set_hook;
+
+    // Not Yet Implemented
+    // Intended to allow hooking in for the purpose of caching.
+    protected $_result_hook;
+
+    // Runtime. These are not the variables you're looking for.
+    protected $_current_bind_dn;
+    protected $_current_bind_pw;
+    protected $_current_host;
+    protected $_supported_control = array();
+    protected $_vlv_indexes_and_searches;
+
+    /**
+     * Constructor
+     *
+     * @param array $config Configuration parameters that have not already
+     *                      been initialized. For configuration parameters
+     *                      that have in fact been set, use the config_set()
+     *                      method after initialization.
+     */
+    public function __construct($config = array())
+    {
+        if (!empty($config) && is_array($config)) {
+            foreach ($config as $key => $value) {
+                if (empty($this->config[$key])) {
+                    $setter = 'config_set_' . $key;
+                    if (method_exists($this, $setter)) {
+                        $this->$setter($value);
+                    }
+                    else if (isset($this->$key)) {
+                        $this->$key = $value;
+                    }
+                    else {
+                        $this->config[$key] = $value;
+                    }
+                }
+            }
+        }
+    }
+
+    /**
+     *  Add multiple entries to the directory information tree in one go.
+     */
+    public function add_entries($entries, $attributes = array())
+    {
+        // If $entries is an associative array, it's keys are DNs and its
+        // values are the attributes for that DN.
+        //
+        // If $entries is a non-associative array, the attributes are expected
+        // to be positional in $attributes.
+
+        $result_set = array();
+
+        if (array_keys($entries) == range(0, count($entries) - 1)) {
+            // $entries is sequential
+            if (count($entries) !== count($attributes)) {
+                $this->_error("Wrong entry/attribute count in " . __FUNCTION__);
+                return false;
+            }
+
+            for ($i = 0; $i < count($entries); $i++) {
+                $result_set[$i] = $this->add_entry($entries[$i], $attributes[$i]);
+            }
+        }
+        else {
+            // $entries is associative
+            foreach ($entries as $entry_dn => $entry_attributes) {
+                if (array_keys($attributes) !== range(0, count($attributes)-1)) {
+                    // $attributes is associative as well, let's merge these
+                    //
+                    // $entry_attributes takes precedence, so is in the second
+                    // position in array_merge()
+                    $entry_attributes = array_merge($attributes, $entry_attributes);
+                }
+
+                $result_set[$entry_dn] = $this->add_entry($entry_dn, $entry_attributes);
+            }
+        }
+
+        return $result_set;
+    }
+
+    /**
+     * Add an entry to the directory information tree.
+     */
+    public function add_entry($entry_dn, $attributes)
+    {
+        // TODO:
+        // - Get entry rdn attribute value from entry_dn and see if it exists in
+        //   attributes -> issue warning if so (but not block the operation).
+        $this->_debug("Entry DN", $entry_dn);
+        $this->_debug("Attributes", $attributes);
+
+        foreach ($attributes as $attr_name => $attr_value) {
+            if (empty($attr_value)) {
+                unset($attributes[$attr_name]);
+            }
+        }
+
+        $this->_debug("C: Add $entry_dn: " . json_encode($attributes));
+
+        if (($add_result = ldap_add($this->conn, $entry_dn, $attributes)) == false) {
+            $this->_debug("S: " . ldap_error($this->conn));
+            $this->_debug("S: Adding entry $entry_dn failed. " . ldap_error($this->conn));
+
+            return false;
+        }
+
+        $this->_debug("LDAP: S: OK");
+
+        return true;
+    }
+
+    /**
+     * Add replication agreements and initialize the consumer(s) for
+     * $domain_root_dn.
+     *
+     * Searches the configured replicas for any of the current domain/config
+     * databases, and uses this information to configure the additional
+     * replication for the (new) domain database (at $domain_root_dn).
+     *
+     * Very specific to Netscape-based directory servers, and currently also
+     * very specific to multi-master replication.
+     */
+    public function add_replication_agreements($domain_root_dn)
+    {
+        $replica_hosts = $this->list_replicas();
+
+        if (empty($replica_hosts)) {
+            return;
+        }
+
+        $result = $this->search($this->config_get('config_root_dn'), "(&(objectclass=nsDS5Replica)(nsDS5ReplicaType=3))", "sub");
+
+        if (!$result) {
+            $this->_debug("No replication configuration found.");
+            return;
+        }
+
+        // Preserve the number of replicated databases we have, because the replication ID
+        // can be calculated from the number of databases replicated, and the number of
+        // servers.
+        $num_replica_dbs = $result->count();
+        $replicas        = $result->entries(true);
+        $max_replica_agreements = 0;
+
+        foreach ($replicas as $replica_dn => $replica_attrs) {
+            $result = $this->search($replica_dn, "(objectclass=nsDS5ReplicationAgreement)", "sub");
+            if ($result) {
+                if ($max_replica_agreements < $result->count()) {
+                    $max_replica_agreements    = $result->count();
+                    $max_replica_agreements_dn = $replica_dn;
+                }
+            }
+        }
+
+        $max_repl_id = $num_replica_dbs * count($replica_hosts);
+
+        $this->_debug("The current maximum replication ID is $max_repl_id");
+        $this->_debug("The current maximum number of replication agreements for any database is $max_replica_agreements (for $max_replica_agreements_dn)");
+        $this->_debug("With " . count($replica_hosts) . " replicas, the next is " . ($max_repl_id + 1) . " and the last one is " . ($max_repl_id + count($replica_hosts)));
+
+        // Then add the replication agreements
+        foreach ($replica_hosts as $num => $replica_host) {
+            $ldap = new Net_LDAP3($this->config);
+            $ldap->config_set('hosts', array($replica_host));
+            $ldap->connect();
+            $ldap->bind($this->_current_bind_dn, $this->_current_bind_pw);
+
+            $replica_attrs = array(
+                'cn' => 'replica',
+                'objectclass' => array(
+                    'top',
+                    'nsds5replica',
+                    'extensibleobject',
+                ),
+                'nsDS5ReplicaBindDN'     => $ldap->get_entry_attribute($replica_dn, "nsDS5ReplicaBindDN"),
+                'nsDS5ReplicaId'         => ($max_repl_id + $num + 1),
+                'nsDS5ReplicaRoot'       => $domain_root_dn,
+                'nsDS5ReplicaType'       => $ldap->get_entry_attribute($replica_dn, "nsDS5ReplicaType"),
+                'nsds5ReplicaPurgeDelay' => $ldap->get_entry_attribute($replica_dn, "nsds5ReplicaPurgeDelay"),
+                'nsDS5Flags'             => $ldap->get_entry_attribute($replica_dn, "nsDS5Flags")
+            );
+
+            $new_replica_dn = 'cn=replica,cn="' . $domain_root_dn . '",cn=mapping tree,cn=config';
+
+            $this->_debug("Adding $new_replica_dn to $replica_host with attributes: " . var_export($replica_attrs, true));
+
+            $result = $ldap->add_entry($new_replica_dn, $replica_attrs);
+
+            if (!$result) {
+                $this->_error("Could not add replication configuration to database for $domain_root_dn on $replica_host");
+                continue;
+            }
+
+            $result = $ldap->search($replica_dn, "(objectclass=nsDS5ReplicationAgreement)", "sub");
+
+            if (!$result) {
+                $this->_error("Host $replica_host does not have any replication agreements");
+                continue;
+            }
+
+            $entries = $result->entries(true);
+            $replica_agreement_tpl_dn = key($entries);
+
+            $this->_debug("Using " . var_export($replica_agreement_tpl_dn, true) . " as the template for new replication agreements");
+
+            foreach ($replica_hosts as $replicate_to_host) {
+                // Skip the current server
+                if ($replicate_to_host == $replica_host) {
+                    continue;
+                }
+
+                $this->_debug("Adding a replication agreement for $domain_root_dn to $replicate_to_host on " . $replica_host);
+
+                $attrs = array(
+                    'objectclass',
+                    'nsDS5ReplicaBindDN',
+                    'nsDS5ReplicaCredentials',
+                    'nsDS5ReplicaTransportInfo',
+                    'nsDS5ReplicaBindMethod',
+                    'nsDS5ReplicaHost',
+                    'nsDS5ReplicaPort'
+                );
+
+                $replica_agreement_attrs = $ldap->get_entry_attributes($replica_agreement_tpl_dn, $attrs);
+                $replica_agreement_attrs['cn'] = array_shift(explode('.', $replicate_to_host)) . str_replace(array('dc=',','), array('_',''), $domain_root_dn);
+                $replica_agreement_attrs['nsDS5ReplicaRoot'] = $domain_root_dn;
+                $replica_agreement_dn = "cn=" . $replica_agreement_attrs['cn'] . "," . $new_replica_dn;
+
+                $this->_debug("Adding $replica_agreement_dn to $replica_host with attributes: " . var_export($replica_agreement_attrs, true));
+
+                $result = $ldap->add_entry($replica_agreement_dn, $replica_agreement_attrs);
+
+                if (!$result) {
+                    $this->_error("Failed adding $replica_agreement_dn");
+                }
+            }
+        }
+
+        $server_id = implode('', array_diff($replica_hosts, $this->_server_id_not));
+
+        $this->_debug("About to trigger consumer initialization for replicas on current 'parent': $server_id");
+
+        $result = $this->search($this->config_get('config_root_dn'), "(&(objectclass=nsDS5ReplicationAgreement)(nsds5replicaroot=$domain_root_dn))", "sub");
+
+        if ($result) {
+            foreach ($result->entries(true) as $agreement_dn => $agreement_attrs) {
+                $this->modify_entry_attributes(
+                    $agreement_dn,
+                    array(
+                        'replace' => array(
+                            'nsds5BeginReplicaRefresh' => 'start',
+                        ),
+                    )
+                );
+            }
+        }
+    }
+
+    public function attribute_details($attributes = array())
+    {
+        $schema = $this->init_schema();
+
+        if (!$schema) {
+            return array();
+        }
+
+        $attribs = $schema->getAll('attributes');
+
+        $attributes_details = array();
+
+        foreach ($attributes as $attribute) {
+            if (array_key_exists($attribute, $attribs)) {
+                $attrib_details = $attribs[$attribute];
+
+                if (!empty($attrib_details['sup'])) {
+                    foreach ($attrib_details['sup'] as $super_attrib) {
+                        $_attrib_details = $attribs[$super_attrib];
+                        if (is_array($_attrib_details)) {
+                            $attrib_details = array_merge($_attrib_details, $attrib_details);
+                        }
+                    }
+                }
+            }
+            else if (array_key_exists(strtolower($attribute), $attribs)) {
+                $attrib_details = $attribs[strtolower($attribute)];
+
+                if (!empty($attrib_details['sup'])) {
+                    foreach ($attrib_details['sup'] as $super_attrib) {
+                        $_attrib_details = $attribs[$super_attrib];
+                        if (is_array($_attrib_details)) {
+                            $attrib_details = array_merge($_attrib_details, $attrib_details);
+                        }
+                    }
+                }
+            }
+            else {
+                $this->_warning("LDAP: No schema details exist for attribute $attribute (which is strange)");
+            }
+
+            // The relevant parts only, please
+            $attributes_details[$attribute] = array(
+                'type'        => !empty($attrib_details['single-value']) ? 'text' : 'list',
+                'description' => $attrib_details['desc'],
+                'syntax'      => $attrib_details['syntax'],
+                'max-length'  => $attrib_details['max-length'] ?: false,
+            );
+        }
+
+        return $attributes_details;
+    }
+
+    public function attributes_allowed($objectclasses = array())
+    {
+        $this->_debug("Listing allowed_attributes for objectclasses", $objectclasses);
+
+        if (!is_array($objectclasses) || empty($objectclasses)) {
+            return false;
+        }
+
+        $schema = $this->init_schema();
+        if (!$schema) {
+            return false;
+        }
+
+        $may          = array();
+        $must         = array();
+        $superclasses = array();
+
+        foreach ($objectclasses as $objectclass) {
+            $superclass = $schema->superclass($objectclass);
+            if (!empty($superclass)) {
+                $superclasses = array_merge($superclass, $superclasses);
+            }
+
+            $_may  = $schema->may($objectclass);
+            $_must = $schema->must($objectclass);
+
+            if (is_array($_may)) {
+                $may = array_merge($may, $_may);
+            }
+            if (is_array($_must)) {
+                $must = array_merge($must, $_must);
+            }
+        }
+
+        $may          = array_unique($may);
+        $must         = array_unique($must);
+        $superclasses = array_unique($superclasses);
+
+        return array('may' => $may, 'must' => $must, 'super' => $superclasses);
+    }
+
+    public function classes_allowed()
+    {
+        $schema = $this->init_schema();
+        if (!$schema) {
+            return false;
+        }
+
+        $list    = $schema->getAll('objectclasses');
+        $classes = array();
+
+        foreach ($list as $class) {
+            $classes[] = $class['name'];
+        }
+
+        return $classes;
+    }
+
+    /**
+     * Bind connection with DN and password
+     *
+     * @param string $dn   Bind DN
+     * @param string $pass Bind password
+     *
+     * @return boolean True on success, False on error
+     */
+    public function bind($bind_dn, $bind_pw)
+    {
+        if (!$this->conn) {
+            return false;
+        }
+
+        if ($bind_dn == $this->_current_bind_dn) {
+            return true;
+        }
+
+        $this->_debug("C: Bind [dn: $bind_dn] [pass: $bind_pw]");
+
+        if (@ldap_bind($this->conn, $bind_dn, $bind_pw)) {
+            $this->_debug("S: OK");
+            $this->_current_bind_dn = $bind_dn;
+            $this->_current_bind_pw = $bind_pw;
+
+            return true;
+        }
+
+        $this->_debug("S: ".ldap_error($this->conn));
+        $this->_error("Bind failed for dn=$bind_dn: ".ldap_error($this->conn));
+
+        return false;
+    }
+
+    /**
+     * Close connection to LDAP server
+     */
+    public function close()
+    {
+        if ($this->conn) {
+            $this->_debug("C: Close");
+            ldap_unbind($this->conn);
+
+            $this->_current_bind_dn = null;
+            $this->_current_bind_pw = null;
+            $this->conn             = null;
+        }
+    }
+
+    /**
+     * Get the value of a configuration item.
+     *
+     * @param string $key     Configuration key
+     * @param mixed  $default Default value to return
+     */
+    public function config_get($key, $default = null)
+    {
+        if (!empty($this->_config_get_hook)) {
+            return call_user_func_array($this->_config_get_hook, array($key, $value));
+        }
+        else if (method_exists($this, "config_get_{$key}")) {
+            return call_user_func(array($this, "config_get_$key"), $value);
+        }
+        else if (!isset($this->config[$key])) {
+            return $default;
+        }
+        else {
+            return $this->config[$key];
+        }
+    }
+
+    /**
+     * Set a configuration item to value.
+     *
+     * @param string $key   Configuration key
+     * @param mixed  $value Configuration value
+     */
+    public function config_set($key, $value = null)
+    {
+        if (is_array($key)) {
+            foreach ($key as $k => $v) {
+                $this->config_set($k, $v);
+            }
+            return;
+        }
+
+        if (!empty($this->_config_set_hook)) {
+            call_user_func($this->_config_set_hook, array($key, $value));
+        }
+        else if (method_exists($this, "config_set_{$key}")) {
+            call_user_func_array(array($this, "config_set_$key"), array($value));
+        }
+        else if (isset($this->$key)) {
+            $this->$key = $value;
+        }
+        else {
+            // 'host' option is deprecated
+            if ($key == 'host') {
+                $this->config['hosts'] = (array) $value;
+            }
+            else {
+                $this->config[$key] = $value;
+            }
+        }
+    }
+
+    /**
+     * Establish a connection to the LDAP server
+     */
+    public function connect($host = null)
+    {
+        if (!function_exists('ldap_connect')) {
+            $this->_error("No ldap support in this PHP installation");
+            return false;
+        }
+
+        if (is_resource($this->conn)) {
+            $this->_debug("Connection already exists");
+            return true;
+        }
+
+        $hosts = !empty($host) ? $host : $this->config_get('hosts', array());
+        $port  = $this->config_get('port', 389);
+
+        foreach ((array) $hosts as $host) {
+            $this->_debug("C: Connect [$host:$port]");
+
+            if ($lc = @ldap_connect($host, $port)) {
+                if ($this->config_get('use_tls', false) === true) {
+                    if (!ldap_start_tls($lc)) {
+                        $this->_debug("S: Could not start TLS. " . ldap_error($lc));
+                        continue;
+                    }
+                }
+
+                $this->_debug("S: OK");
+
+                $ldap_version = $this->config_get('ldap_version', 3);
+                $timeout      = $this->config_get('network_timeout');
+                $referrals    = $this->config_get('referrals');
+
+                ldap_set_option($lc, LDAP_OPT_PROTOCOL_VERSION, $ldap_version);
+
+                if ($timeout) {
+                    ldap_set_option($lc, LDAP_OPT_NETWORK_TIMEOUT, $timeout);
+                }
+
+                if ($referrals !== null) {
+                    ldap_set_option($lc, LDAP_OPT_REFERRALS, (bool) $referrals);
+                }
+
+                $this->_current_host = $host;
+                $this->conn          = $lc;
+
+                break;
+            }
+
+            $this->_debug("S: NOT OK");
+        }
+
+        if (!is_resource($this->conn)) {
+            $this->_error("Could not connect to LDAP");
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     *   Shortcut to ldap_delete()
+     */
+    public function delete_entry($entry_dn)
+    {
+        $this->_debug("LDAP: C: Delete $entry_dn");
+
+        if (ldap_delete($this->conn, $entry_dn) === false) {
+            $this->_debug("LDAP: S: " . ldap_error($this->conn));
+            return false;
+        }
+
+        $this->_debug("LDAP: S: OK");
+
+        return true;
+    }
+
+    /**
+     * Deletes specified entry and all entries in the tree
+     */
+    public function delete_entry_recursive($entry_dn)
+    {
+        // searching for sub entries, but not scope sub, just one level
+        $result = $this->search($entry_dn, '(objectclass=*)', 'one');
+
+        if ($result) {
+            $entries = $result->entries(true);
+
+            foreach (array_keys($entries) as $sub_dn) {
+                if (!$this->delete_entry_recursive($sub_dn)) {
+                    return false;
+                }
+            }
+        }
+
+        if (!$this->delete_entry($entry_dn)) {
+            return false;
+        }
+
+        return true;
+    }
+
+    public function effective_rights($subject)
+    {
+        $effective_rights_control_oid = "1.3.6.1.4.1.42.2.27.9.5.2";
+
+        $supported_controls = $this->supported_controls();
+
+        if (!in_array($effective_rights_control_oid, $supported_controls)) {
+            $this->_debug("LDAP: No getEffectiveRights control in supportedControls");
+            return false;
+        }
+
+        $attributes = array(
+            'attributeLevelRights' => array(),
+            'entryLevelRights' => array(),
+        );
+
+        $output   = array();
+        $entry_dn = $this->entry_dn($subject);
+
+        if (!$entry_dn) {
+            $entry_dn = $this->config_get($subject . "_base_dn");
+        }
+        if (!$entry_dn) {
+            $entry_dn = $this->config_get("base_dn");
+        }
+        if (!$entry_dn) {
+            $entry_dn = $this->config_get("root_dn");
+        }
+
+        $this->_debug("effective_rights for subject $subject resolves to entry dn $entry_dn");
+
+        $moz_ldapsearch = "/usr/lib64/mozldap/ldapsearch";
+        if (!is_file($moz_ldapsearch)) {
+            $moz_ldapsearch = "/usr/lib/mozldap/ldapsearch";
+        }
+        if (!is_file($moz_ldapsearch)) {
+            $moz_ldapsearch = null;
+        }
+
+        if (empty($moz_ldapsearch)) {
+            $this->_error("Mozilla LDAP C SDK binary ldapsearch not found, cannot get effective rights on subject $subject");
+            return null;
+        }
+
+        $command = array(
+            $moz_ldapsearch,
+            '-x',
+            '-h',
+            $this->_ldap_server,
+            '-p',
+            $this->_ldap_port,
+            '-b',
+            escapeshellarg($entry_dn),
+            '-D',
+            escapeshellarg($this->_current_bind_dn),
+            '-w',
+            escapeshellarg($this->_current_bind_pw),
+            '-J',
+            escapeshellarg(implode(':', array(
+                $effective_rights_control_oid,          // OID
+                'true',                                 // Criticality
+                'dn:' . $this->_current_bind_dn // User DN
+            ))),
+            '-s',
+            'base',
+            '"(objectclass=*)"',
+            '"*"',
+        );
+
+        $command = implode(' ', $command);
+
+        $this->_debug("LDAP: Executing command: $command");
+
+        exec($command, $output, $return_code);
+
+        $this->_debug("LDAP: Command output:" . var_export($output, true));
+        $this->_debug("Return code: " . $return_code);
+
+        if ($return_code) {
+            $this->_error("Command $moz_ldapsearch returned error code: $return_code");
+            return null;
+        }
+
+        $lines = array();
+        foreach ($output as $line_num => $line) {
+            if (substr($line, 0, 1) == " ") {
+                $lines[count($lines)-1] .= trim($line);
+            }
+            else {
+                $lines[] = trim($line);
+            }
+        }
+
+        foreach ($lines as $line) {
+            $line_components = explode(':', $line);
+            $attribute_name  = array_shift($line_components);
+            $attribute_value = trim(implode(':', $line_components));
+
+            switch ($attribute_name) {
+                case "attributeLevelRights":
+                    $attributes[$attribute_name] = $this->parse_attribute_level_rights($attribute_value);
+                    break;
+                case "dn":
+                    $attributes[$attribute_name] = $attribute_value;
+                    break;
+                case "entryLevelRights":
+                    $attributes[$attribute_name] = $this->parse_entry_level_rights($attribute_value);
+                    break;
+
+                default:
+                    break;
+            }
+        }
+
+        return $attributes;
+    }
+
+    /**
+     * Resolve entry data to entry DN
+     *
+     * @param string $subject    Entry string (e.g. entry DN or unique attribute value)
+     * @param array  $attributes Additional attributes
+     * @param string $base_dn    Optional base DN
+     *
+     * @return string Entry DN string
+     */
+    public function entry_dn($subject, $attributes = array(), $base_dn = null)
+    {
+        $this->_debug("entry_dn on subject $subject");
+        $is_dn = ldap_explode_dn($subject, 1);
+
+        if (is_array($is_dn) && array_key_exists("count", $is_dn) && $is_dn["count"] > 0) {
+            $this->_debug("$subject is a dn");
+            return $subject;
+        }
+
+        $this->_debug("$subject is not a dn");
+
+        if (strlen($subject) < 32 || preg_match('/[^a-fA-F0-9-]/', $subject)) {
+            $this->_debug("$subject is not a unique identifier");
+            return;
+        }
+
+        $unique_attr = $this->config_get('unique_attribute', 'nsuniqueid');
+
+        $this->_debug("Using unique_attribute " . var_export($unique_attr, true) . " at " . __FILE__ . ":" . __LINE__);
+
+        $attributes  = array_merge(array($unique_attr => $subject), (array)$attributes);
+        $subject     = $this->entry_find_by_attribute($attributes, $base_dn);
+
+        if (!empty($subject)) {
+            return key($subject);
+        }
+    }
+
+    public function entry_find_by_attribute($attributes, $base_dn = null)
+    {
+        $this->_debug("Net_LDAP3::entry_find_by_attribute(\$attributes, \$base_dn) called with base_dn", $base_dn, "and attributes", $attributes);
+
+        if (empty($attributes) || !is_array($attributes)) {
+            return false;
+        }
+
+        if (empty($attributes[key($attributes)])) {
+            return false;
+        }
+
+        $filter = count($attributes) ? "(&" : "";
+
+        foreach ($attributes as $key => $value) {
+            $filter .= "(" . $key . "=" . $value . ")";
+        }
+
+        $filter .= count($attributes) ? ")" : "";
+
+        if (empty($base_dn)) {
+            $base_dn = $this->config_get('root_dn');
+            $this->_debug("Using base_dn from domain " . $this->domain . ": " . $base_dn);
+        }
+
+        $result = $this->search($base_dn, $filter, 'sub', array_keys($attributes));
+
+        if ($result && $result->count() > 0) {
+            $this->_debug("Results found: " . implode(', ', array_keys($result->entries(true))));
+            return $result->entries(true);
+        }
+        else {
+            $this->_debug("No result");
+            return false;
+        }
+    }
+
+    public function find_user_groups($member_dn)
+    {
+        $groups  = array();
+        $root_dn = $this->config_get('root_dn');
+
+        // TODO: Do not query for both, it's either one or the other
+        $entries = $this->search($root_dn, "(|" .
+            "(&(objectclass=groupofnames)(member=$member_dn))" .
+            "(&(objectclass=groupofuniquenames)(uniquemember=$member_dn))" .
+            ")"
+        );
+
+        if ($entries) {
+            $groups = array_keys($entries->entries(true));
+        }
+
+        return $groups;
+    }
+
+    public function get_entry_attribute($subject_dn, $attribute)
+    {
+        $entry = $this->get_entry_attributes($subject_dn, (array)$attribute);
+
+        return $entry[strtolower($attribute)];
+    }
+
+    public function get_entry_attributes($subject_dn, $attributes)
+    {
+        // @TODO: use get_entry?
+        $result = $this->search($subject_dn, '(objectclass=*)', 'base', $attributes);
+
+        if (!$result) {
+            return array();
+        }
+
+        $entries  = $result->entries(true);
+        $entry_dn = key($entries);
+        $entry    = $entries[$entry_dn];
+
+        return $entry;
+    }
+
+    /**
+     * Get a specific LDAP entry, identified by its DN
+     *
+     * @param string $dn         Record identifier
+     * @param array  $attributes Attributes to return
+     *
+     * @return array Hash array
+     */
+    public function get_entry($dn, $attributes = array())
+    {
+        $rec = null;
+
+        if ($this->conn && $dn) {
+            $this->_debug("C: Read [dn: $dn] [(objectclass=*)]");
+
+            if ($ldap_result = @ldap_read($this->conn, $dn, '(objectclass=*)', $attributes)) {
+                $this->_debug("S: OK");
+
+                if ($entry = ldap_first_entry($this->conn, $ldap_result)) {
+                    $rec = ldap_get_attributes($this->conn, $entry);
+                }
+            }
+            else {
+                $this->_debug("S: ".ldap_error($this->conn));
+            }
+
+            if (!empty($rec)) {
+                $rec['dn'] = $dn; // Add in the dn for the entry.
+            }
+        }
+
+        return $rec;
+    }
+
+    public function list_replicas()
+    {
+        $this->_debug("Finding replicas for this server.");
+
+        // Search any host that is a replica for the current host
+        $replica_hosts = $this->config_get('replica_hosts', array());
+        $root_dn       = $this->config_get('config_root_dn');
+
+        if (!empty($replica_hosts)) {
+            return $replica_hosts;
+        }
+
+        $ldap = new Net_LDAP3($this->config);
+        $ldap->connect();
+        $ldap->bind($this->_current_bind_dn, $this->_current_bind_pw);
+
+        $result = $ldap->search($root_dn, '(objectclass=nsds5replicationagreement)', 'sub', array('nsds5replicahost'));
+
+        if (!$result) {
+            $this->_debug("No replicas configured");
+            return $replica_hosts;
+        }
+
+        $this->_debug("Replication agreements found: " . var_export($result->entries(true), true));
+
+        foreach ($result->entries(true) as $dn => $attrs) {
+            if (!in_array($attrs['nsds5replicahost'], $replica_hosts)) {
+                $replica_hosts[] = $attrs['nsds5replicahost'];
+            }
+        }
+
+        // $replica_hosts now holds the IDs of servers we are currently NOT
+        // connected to. We might need this later in order to set
+        $this->_server_id_not = $replica_hosts;
+
+        $this->_debug("So far, we have the following replicas: " . var_export($replica_hosts, true));
+
+        $ldap->close();
+
+        foreach ($replica_hosts as $replica_host) {
+            $ldap->config_set('hosts', array($replica_host));
+            $ldap->connect();
+            $ldap->bind($this->_current_bind_dn, $this->_current_bind_pw);
+
+            $result = $ldap->search($root_dn, '(objectclass=nsds5replicationagreement)', 'sub', array('nsds5replicahost'));
+            if (!$result) {
+                $this->_debug("No replicas configured");
+            }
+
+            foreach ($result->entries(true) as $dn => $attrs) {
+                if (!in_array($attrs['nsds5replicahost'], $replica_hosts)) {
+                    $replica_hosts[] = $attrs['nsds5replicahost'];
+                }
+            }
+
+            $ldap->close();
+        }
+
+        $this->config_set('replica_hosts', $replica_hosts);
+
+        return $replica_hosts;
+    }
+
+    public function login($username, $password, $domain = null)
+    {
+        $this->_debug("Net_LDAP3::login(\$username = '" . $username . "', \$password = '****', \$domain = '" . $domain . "')");
+
+        $_bind_dn = $this->config_get('service_bind_dn');
+        $_bind_pw = $this->config_get('service_bind_pw');
+
+        if (empty($_bind_dn)) {
+            $this->_debug("No valid service bind dn found.");
+            return null;
+        }
+
+        if (empty($_bind_pw)) {
+            $this->_debug("No valid service bind password found.");
+            return null;
+        }
+
+        $bound = $this->bind($_bind_dn, $_bind_pw);
+
+        if (!$bound) {
+            $this->_debug("Could not bind with service bind credentials.");
+            return null;
+        }
+
+        $entry_dn = $this->entry_dn($username);
+
+        if (!empty($entry_dn)) {
+            $bound = $this->bind($entry_dn, $password);
+
+            if (!$bound) {
+                $this->_error("Could not bind with " . $entry_dn);
+                return null;
+            }
+
+            return $entry_dn;
+        }
+
+        $base_dn = $this->config_get('root_dn');
+
+        if (empty($base_dn)) {
+            $this->_debug("Could not get a valid base dn to search.");
+            return null;
+        }
+
+        $localpart = $username;
+
+        if (empty($domain) ) {
+            if (count(explode('@', $username)) > 1) {
+                $_parts    = explode('@', $username);
+                $localpart = $_parts[0];
+                $domain    = $_parts[1];
+            }
+            else {
+                $localpart = $username;
+                $domain    = '';
+            }
+        }
+
+        $realm  = $domain;
+        $filter = $this->config_get("login_filter", null);
+
+        if (empty($filter)) {
+            $filter = $this->config_get("filter", null);
+        }
+        if (empty($filter)) {
+            $filter = "(&(|(mail=%s)(mail=%U@%d)(alias=%s)(alias=%U@%d)(uid=%s))(objectclass=inetorgperson))";
+        }
+
+        $this->_debug("Net::LDAP3::login() original filter: " . $filter);
+
+        $replace_patterns = array(
+            '/%s/' => $username,
+            '/%d/' => $domain,
+            '/%U/' => $localpart,
+            '/%r/' => $realm
+        );
+
+        $filter = preg_replace(array_keys($replace_patterns), array_values($replace_patterns), $filter);
+
+        $this->_debug("Net::LDAP3::login() actual filter: " . $filter);
+
+        $result = $this->search($base_dn, $filter, 'sub');
+
+        if (!$result) {
+            $this->_debug("Could not search $base_dn with $filter");
+            return null;
+        }
+
+        if ($result->count() > 1) {
+            $this->_debug("Multiple entries found.");
+            return null;
+        }
+        else if ($result->count() < 1) {
+            $this->_debug("No entries found.");
+            return null;
+        }
+
+        $entries  = $result->entries();
+        $entry    = self::normalize_result($entries);
+        $entry_dn = key($entry);
+
+        $bound = $this->bind($entry_dn, $password);
+
+        if (!$bound) {
+            $this->_debug("Could not bind with " . $entry_dn);
+            return null;
+        }
+
+        return $entry_dn;
+    }
+
+    public function list_group_members($dn, $entry = null, $recurse = true)
+    {
+        $this->_debug("Called list_group_members(" . $dn . ")");
+
+        if (is_array($entry) && in_array('objectclass', $entry)) {
+            if (!in_array(array('groupofnames', 'groupofuniquenames', 'groupofurls'), $entry['objectclass'])) {
+                $this->_debug("Called list_group_members on a non-group!");
+                return array();
+            }
+        }
+        else {
+            $entry = $this->get_entry($dn, array('member', 'uniquemember', 'memberurl', 'objectclass'));
+
+            if (!$entry) {
+                return array();
+            }
+        }
+
+        $group_members = array();
+
+        foreach ((array)$entry['objectclass'] as $objectclass) {
+            switch (strtolower($objectclass)) {
+                case "groupofnames":
+                case "kolabgroupofnames":
+                    $group_members = array_merge($group_members, $this->list_group_member($dn, $entry['member'], $recurse));
+                    break;
+                case "groupofuniquenames":
+                case "kolabgroupofuniquenames":
+                    $group_members = array_merge($group_members, $this->list_group_uniquemember($dn, $entry['uniquemember'], $recurse));
+                    break;
+                case "groupofurls":
+                    $group_members = array_merge($group_members, $this->list_group_memberurl($dn, $entry['memberurl'], $recurse));
+                    break;
+            }
+        }
+
+        return array_values(array_filter($group_members));
+    }
+
+    public function modify_entry($subject_dn, $old_attrs, $new_attrs)
+    {
+        $this->_debug("OLD ATTRIBUTES", $old_attrs);
+        $this->_debug("NEW ATTRIBUTES", $new_attrs);
+
+        // TODO: Get $rdn_attr - we have type_id in $new_attrs
+        $dn_components  = ldap_explode_dn($subject_dn, 0);
+        $rdn_components = explode('=', $dn_components[0]);
+        $rdn_attr       = $rdn_components[0];
+
+        $this->_debug("Net_LDAP3::modify_entry() using rdn attribute: " . $rdn_attr);
+
+        $mod_array = array(
+            'add'       => array(), // For use with ldap_mod_add()
+            'del'       => array(), // For use with ldap_mod_del()
+            'replace'   => array(), // For use with ldap_mod_replace()
+            'rename'    => array(), // For use with ldap_rename()
+        );
+
+        // This is me cheating. Remove this special attribute.
+        if (array_key_exists('ou', $old_attrs) || array_key_exists('ou', $new_attrs)) {
+            $old_ou = $old_attrs['ou'];
+            $new_ou = $new_attrs['ou'];
+            unset($old_attrs['ou']);
+            unset($new_attrs['ou']);
+        }
+        else {
+            $old_ou = null;
+            $new_ou = null;
+        }
+
+        // Compare each attribute value of the old attrs with the corresponding value
+        // in the new attrs, if any.
+        foreach ($old_attrs as $attr => $old_attr_value) {
+            if (is_array($old_attr_value)) {
+                if (count($old_attr_value) == 1) {
+                    $old_attrs[$attr] = $old_attr_value[0];
+                    $old_attr_value = $old_attrs[$attr];
+                }
+            }
+
+            if (array_key_exists($attr, $new_attrs)) {
+                if (is_array($new_attrs[$attr])) {
+                    if (count($new_attrs[$attr]) == 1) {
+                        $new_attrs[$attr] = $new_attrs[$attr][0];
+                    }
+                }
+
+                if (is_array($old_attrs[$attr]) && is_array($new_attrs[$attr])) {
+                    $_sort1 = $new_attrs[$attr];
+                    sort($_sort1);
+                    $_sort2 = $old_attr_value;
+                    sort($_sort2);
+                }
+                else {
+                    $_sort1 = true;
+                    $_sort2 = false;
+                }
+
+                if ($new_attrs[$attr] !== $old_attr_value && $_sort1 !== $_sort2) {
+                    $this->_debug("Attribute $attr changed from " . var_export($old_attr_value, true) . " to " . var_export($new_attrs[$attr], true));
+                    if ($attr === $rdn_attr) {
+                        $this->_debug("This attribute is the RDN attribute. Let's see if it is multi-valued, and if the original still exists in the new value.");
+                        if (is_array($old_attrs[$attr])) {
+                            if (!is_array($new_attrs[$attr])) {
+                                if (in_array($new_attrs[$attr], $old_attrs[$attr])) {
+                                    // TODO: Need to remove all $old_attrs[$attr] values not equal to $new_attrs[$attr], and not equal to the current $rdn_attr value [0]
+
+                                    $this->_debug("old attrs. is array, new attrs. is not array. new attr. exists in old attrs.");
+
+                                    $rdn_attr_value = array_shift($old_attrs[$attr]);
+                                    $_attr_to_remove = array();
+
+                                    foreach ($old_attrs[$attr] as $value) {
+                                        if (strtolower($value) != strtolower($new_attrs[$attr])) {
+                                            $_attr_to_remove[] = $value;
+                                        }
+                                    }
+
+                                    $this->_debug("Adding to delete attribute $attr values:" . implode(', ', $_attr_to_remove));
+
+                                    $mod_array['del'][$attr] = $_attr_to_remove;
+
+                                    if (strtolower($new_attrs[$attr]) !== strtolower($rdn_attr_value)) {
+                                        $this->_debug("new attrs is not the same as the old rdn value, issuing a rename");
+                                        $mod_array['rename']['dn'] = $subject_dn;
+                                        $mod_array['rename']['new_rdn'] = $rdn_attr . '=' . $new_attrs[$attr][0];
+                                    }
+                                }
+                                else {
+                                    $this->_debug("new attrs is not the same as any of the old rdn value, issuing a full rename");
+                                    $mod_array['rename']['dn'] = $subject_dn;
+                                    $mod_array['rename']['new_rdn'] = $rdn_attr . '=' . $new_attrs[$attr];
+                                }
+                            }
+                            else {
+                                // TODO: See if the rdn attr. value is still in $new_attrs[$attr]
+                                if (in_array($old_attrs[$attr][0], $new_attrs[$attr])) {
+                                    $this->_debug("Simply replacing attr $attr as rdn attr value is preserved.");
+                                    $mod_array['replace'][$attr] = $new_attrs[$attr];
+                                }
+                                else {
+                                    // TODO: This fails.
+                                    $mod_array['rename']['dn'] = $subject_dn;
+                                    $mod_array['rename']['new_rdn'] = $rdn_attr . '=' . $new_attrs[$attr][0];
+                                    $mod_array['del'][$attr] = $old_attrs[$attr][0];
+                                }
+                            }
+                        }
+                        else {
+                            if (!is_array($new_attrs[$attr])) {
+                                $this->_debug("Renaming " . $old_attrs[$attr] . " to " . $new_attrs[$attr]);
+                                $mod_array['rename']['dn'] = $subject_dn;
+                                $mod_array['rename']['new_rdn'] = $rdn_attr . '=' . $new_attrs[$attr];
+                            }
+                            else {
+                                $this->_debug("Adding to replace");
+                                // An additional attribute value is being supplied. Just replace and continue.
+                                $mod_array['replace'][$attr] = $new_attrs[$attr];
+                                continue;
+                            }
+                        }
+
+                    }
+                    else {
+                        if (!isset($new_attrs[$attr]) || $new_attrs[$attr] === '' || (is_array($new_attrs[$attr]) && empty($new_attrs[$attr]))) {
+                            switch ($attr) {
+                                case "userpassword":
+                                    break;
+                                default:
+                                    $this->_debug("Adding to del: $attr");
+                                    $mod_array['del'][$attr] = (array)($old_attr_value);
+                                    break;
+                            }
+                        }
+                        else {
+                            $this->_debug("Adding to replace: $attr");
+                            $mod_array['replace'][$attr] = (array)($new_attrs[$attr]);
+                        }
+                    }
+                }
+                else {
+                    $this->_debug("Attribute $attr unchanged");
+                }
+            }
+            else {
+                // TODO: Since we're not shipping the entire object back and forth, and only post
+                // part of the data... we don't know what is actually removed (think modifiedtimestamp, etc.)
+                $this->_debug("Group attribute $attr not mentioned in \$new_attrs..., but not explicitly removed... by assumption");
+            }
+        }
+
+        foreach ($new_attrs as $attr => $value) {
+            // OU's parent base dn
+            if ($attr == 'base_dn') {
+                continue;
+            }
+
+            if (is_array($value)) {
+                if (count($value) == 1) {
+                    $new_attrs[$attr] = $value[0];
+                    $value = $new_attrs[$attr];
+                }
+            }
+
+            if (array_key_exists($attr, $old_attrs)) {
+                if (is_array($old_attrs[$attr])) {
+                    if (count($old_attrs[$attr]) == 1) {
+                        $old_attrs[$attr] = $old_attrs[$attr][0];
+                    }
+                }
+
+                if (is_array($new_attrs[$attr]) && is_array($old_attrs[$attr])) {
+                    $_sort1 = $old_attrs[$attr];
+                    sort($_sort1);
+                    $_sort2 = $value;
+                    sort($_sort2);
+                }
+                else {
+                    $_sort1 = true;
+                    $_sort2 = false;
+                }
+
+                if ($value === null || $value === '' || (is_array($value) && empty($value))) {
+                    if (!array_key_exists($attr, $mod_array['del'])) {
+                        switch ($attr) {
+                            case 'userpassword':
+                                break;
+                            default:
+                                $this->_debug("Adding to del(2): $attr");
+                                $mod_array['del'][$attr] = (array)($old_attrs[$attr]);
+                                break;
+                        }
+                    }
+                }
+                else {
+                    if (!($old_attrs[$attr] === $value) && !($attr === $rdn_attr) && !($_sort1 === $_sort2)) {
+                        if (!array_key_exists($attr, $mod_array['replace'])) {
+                            $this->_debug("Adding to replace(2): $attr");
+                            $mod_array['replace'][$attr] = $value;
+                        }
+                    }
+                }
+            }
+            else {
+                if (!empty($value)) {
+                    $mod_array['add'][$attr] = $value;
+                }
+            }
+        }
+
+        if (empty($old_ou)) {
+            $subject_dn_components = ldap_explode_dn($subject_dn, 0);
+            unset($subject_dn_components["count"]);
+            $subject_rdn = array_shift($subject_dn_components);
+            $old_ou      = implode(',', $subject_dn_components);
+        }
+
+        // object is an organizational unit
+        if (strpos($subject_dn, 'ou=' . $old_ou) === 0) {
+            $root = substr($subject_dn, strlen($old_ou) + 4); // remove ou=*,
+
+            if ((!empty($new_attrs['base_dn']) && strtolower($new_attrs['base_dn']) !== strtolower($root))
+                || (strtolower($old_ou) !== strtolower($new_ou))
+            ) {
+                if (!empty($new_attrs['base_dn'])) {
+                    $root = $new_attrs['base_dn'];
+                }
+
+                $mod_array['rename']['new_parent'] = $root;
+                $mod_array['rename']['dn']         = $subject_dn;
+                $mod_array['rename']['new_rdn']    = 'ou=' . $new_ou;
+            }
+        }
+        // not OU object, but changed ou attribute
+        else if ((!empty($old_ou) && !empty($new_ou)) && strtolower($old_ou) !== strtolower($new_ou)) {
+            $mod_array['rename']['new_parent'] = $new_ou;
+            if (empty($mod_array['rename']['dn']) || empty($mod_array['rename']['new_rdn'])) {
+                $mod_array['rename']['dn']      = $subject_dn;
+                $mod_array['rename']['new_rdn'] = $rdn_attr . '=' . $new_attrs[$rdn_attr];
+            }
+        }
+
+        $this->_debug($mod_array);
+
+        $result = $this->modify_entry_attributes($subject_dn, $mod_array);
+
+        if ($result) {
+            return $mod_array;
+        }
+    }
+
+    /**
+     * Bind connection with (SASL-) user and password
+     *
+     * @param string $authc Authentication user
+     * @param string $pass  Bind password
+     * @param string $authz Autorization user
+     *
+     * @return boolean True on success, False on error
+     */
+    public function sasl_bind($authc, $pass, $authz=null)
+    {
+        if (!$this->conn) {
+            return false;
+        }
+
+        if (!function_exists('ldap_sasl_bind')) {
+            $this->_error("Unable to bind: ldap_sasl_bind() not exists");
+            return false;
+        }
+
+        if (!empty($authz)) {
+            $authz = 'u:' . $authz;
+        }
+
+        $method = $this->config_get('auth_method');
+        if (empty($method)) {
+            $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;
+        }
+
+        $this->_debug("S: ".ldap_error($this->conn));
+        $this->_error("Bind failed for authcid=$authc ".ldap_error($this->conn));
+
+        return false;
+    }
+
+    /**
+     * Execute LDAP search
+     *
+     * @param string $base_dn    Base DN to use for searching
+     * @param string $filter     Filter string to query
+     * @param string $scope      The LDAP scope (list|sub|base)
+     * @param array  $attrs      List of entry attributes to read
+     * @param array  $prop       Hash array with query configuration properties:
+     *   - sort:   array of sort attributes (has to be in sync with the VLV index)
+     *   - search: search string used for VLV controls
+     * @param bool   $count_only Set to true if only entry count is requested
+     *
+     * @return mixed Net_LDAP3_Result object or number of entries (if $count_only=true) or False on failure
+     */
+    public function search($base_dn, $filter = '(objectclass=*)', $scope = 'sub', $attrs = array('dn'), $props = array(), $count_only = false)
+    {
+        if (!$this->conn) {
+            $this->_debug("No active connection for " . __CLASS__ . "::" . __FUNCTION__);
+            return false;
+        }
+
+        $this->_debug("C: Search base dn: [$base_dn] scope [$scope] with filter [$filter]");
+
+        // make sure attributes list is not empty
+        if (empty($attrs)) {
+            $attrs = array('dn');
+        }
+
+        if (!$count_only && ($sort = $this->find_vlv($base_dn, $filter, $scope, $props['sort']))) {
+            // when using VLV, we get the total count by...
+            // ...either reading numSubOrdinates attribute
+            if (($sub_filter = $this->config_get('numsub_filter')) &&
+                ($result_count = @$ns_function($this->conn, $base_dn, $sub_filter, array('numSubOrdinates'), 0, 0, 0))
+            ) {
+                $counts = ldap_get_entries($this->conn, $result_count);
+                for ($vlv_count = $j = 0; $j < $counts['count']; $j++) {
+                    $vlv_count += $counts[$j]['numsubordinates'][0];
+                }
+                $this->_debug("D: total numsubordinates = " . $vlv_count);
+            }
+            // ...or by fetching all records dn and count them
+            else if (!function_exists('ldap_parse_virtuallist_control')) {
+                $vlv_count = $this->search($base_dn, $filter, $scope, array('dn'), $props, true);
+            }
+
+            $this->vlv_active = $this->_vlv_set_controls($sort, $this->list_page, $this->page_size,
+                $this->_vlv_search($sort, $props['search']));
+        }
+        else {
+            $this->vlv_active = false;
+        }
+
+        $function  = self::scope_to_function($scope, $ns_function);
+        $sizelimit = (int) $this->config['sizelimit'];
+        $timelimit = (int) $this->config['timelimit'];
+
+        $this->_debug("Using function $function on scope $scope (\$ns_function is $ns_function)");
+
+        if ($this->vlv_active) {
+            if (!empty($this->additional_filter)) {
+                $filter = "(&" . $filter . $this->additional_filter . ")";
+                $this->_debug("C: (With VLV) Setting a filter (with additional filter) of " . $filter);
+            }
+            else {
+                $this->_debug("C: (With VLV) Setting a filter (without additional filter) of " . $filter);
+            }
+        }
+        else {
+            if (!empty($this->additional_filter)) {
+                $filter = "(&" . $filter . $this->additional_filter . ")";
+            }
+            $this->_debug("C: (Without VLV) Setting a filter of " . $filter);
+        }
+
+        $this->_debug("Executing search with return attributes: " . var_export($attrs, true));
+
+        $ldap_result = @$function($this->conn, $base_dn, $filter, $attrs, 0, $sizelimit, $timelimit);
+
+        if (!$ldap_result) {
+            $this->_debug("$function failed for dn=$base_dn: ".ldap_error($this->conn));
+            return false;
+        }
+
+        // when running on a patched PHP we can use the extended functions
+        // to retrieve the total count from the LDAP search result
+        if ($this->vlv_active && function_exists('ldap_parse_virtuallist_control')) {
+            if (ldap_parse_result($this->conn, $ldap_result, $errcode, $matcheddn, $errmsg, $referrals, $serverctrls)) {
+                ldap_parse_virtuallist_control($this->conn, $serverctrls, $last_offset, $vlv_count, $vresult);
+                $this->_debug("S: VLV result: last_offset=$last_offset; content_count=$vlv_count");
+            }
+            else {
+                $this->_debug("S: ".($errmsg ? $errmsg : ldap_error($this->conn)));
+            }
+        }
+        else if ($this->debug) {
+            $this->_debug("S: ".ldap_count_entries($this->conn, $ldap_result)." record(s) found");
+        }
+
+        $result = new Net_LDAP3_Result($this->conn, $base_dn, $filter, $scope, $ldap_result);
+        $result->set('offset', $last_offset);
+        $result->set('count', $vlv_count);
+        $result->set('vlv', true);
+
+        return $count_only ? $result->count() : $result;
+    }
+
+    /**
+     * Similar to Net_LDAP3::search() but using a search array with multiple
+     * keys and values that to continue to use the VLV but with an original
+     * filter adding the search stuff to an additional filter.
+     *
+     * @see Net_LDAP3::search()
+     */
+    public function search_entries($base_dn, $filter = '(objectclass=*)', $scope = 'sub', $attrs = array('dn'), $props = array())
+    {
+        $this->_debug("Net_LDAP3::search_entries with search " . var_export($props, true));
+
+        if (is_array($props['search']) && array_key_exists('params', $props['search'])) {
+            $_search = $this->search_filter($props['search']);
+            $this->_debug("C: Search filter: $_search");
+
+            if (!empty($_search)) {
+                $this->additional_filter = $_search;
+            }
+            else {
+                $this->additional_filter = "(|";
+
+                foreach ($props['search'] as $attr => $value) {
+                    $this->additional_filter .= "(" . $attr . "=" . $this->_fuzzy_search_prefix() . $value . $this->_fuzzy_search_suffix() . ")";
+                }
+
+                $this->additional_filter .= ")";
+            }
+
+            $this->_debug("C: Setting an additional filter " . $this->additional_filter);
+        }
+
+        $search = $this->search($base_dn, $filter, $scope, $attrs, $props);
+
+        $this->additional_filter = null;
+
+        if (!$search) {
+            $this->_debug("Net_LDAP3: Search did not succeed!");
+            return false;
+        }
+
+        return $search;
+    }
+
+    /**
+     * Create LDAP search filter string according to defined parameters.
+     */
+    public function search_filter($search)
+    {
+        if (empty($search) || !is_array($search) || empty($search['params'])) {
+            return null;
+        }
+
+        $operators = array('=', '~=', '>=', '<=');
+        $filter    = '';
+
+        foreach ((array) $search['params'] as $field => $param) {
+            switch ((string)$param['type']) {
+                case 'prefix':
+                    $prefix = '';
+                    $suffix = '*';
+                    break;
+
+                case 'suffix':
+                    $prefix = '*';
+                    $suffix = '';
+                    break;
+
+                case 'exact':
+                case '=':
+                case '~=':
+                case '>=':
+                case '<=':
+                    $prefix = '';
+                    $suffix = '';
+                    break;
+
+                case 'exists':
+                    $prefix = '*';
+                    $suffix = '';
+                    $param['value'] = '';
+                    break;
+
+                case 'both':
+                default:
+                    $prefix = '*';
+                    $suffix = '*';
+                    break;
+            }
+
+            $operator = $param['type'] && in_array($param['type'], $operators) ? $param['type'] : '=';
+
+            if (is_array($param['value'])) {
+                $val_filter = array();
+                foreach ($param['value'] as $val) {
+                    $value = self::quote_string($val);
+                    $val_filter[] = "(" . $field . $operator . $prefix . $value . $suffix . ")";
+                }
+                $filter .= "(|" . implode($val_filter, '') . ")";
+            }
+            else {
+                $value = self::quote_string($param['value']);
+                $filter .= "(" . $field . $operator . $prefix . $value . $suffix . ")";
+            }
+        }
+
+        // join search parameters with specified operator ('OR' or 'AND')
+        if (count($search['params']) > 1) {
+            $filter = '(' . ($search['operator'] == 'AND' ? '&' : '|') . $filter . ')';
+        }
+
+        return $filter;
+    }
+
+    /**
+     * Set properties for VLV-based paging
+     *
+     * @param number $page Page number to list (starting at 1)
+     * @param number $size Number of entries to display on one page
+     */
+    public function set_vlv_page($page, $size = 10)
+    {
+        $this->list_page = $page;
+        $this->page_size = $size;
+    }
+
+    /**
+     * Turn an LDAP entry into a regular PHP array with attributes as keys.
+     *
+     * @param array $entry Attributes array as retrieved from ldap_get_attributes() or ldap_get_entries()
+     *
+     * @return array Hash array with attributes as keys
+     */
+    public static function normalize_entry($entry)
+    {
+        $rec = array();
+        for ($i=0; $i < $entry['count']; $i++) {
+            $attr = $entry[$i];
+            for ($j=0; $j < $entry[$attr]['count']; $j++) {
+                $rec[$attr][$j] = $entry[$attr][$j];
+            }
+        }
+
+        return $rec;
+    }
+
+    /**
+     * Normalize a ldap result by converting entry attribute arrays into single values
+     */
+    public static function normalize_result($_result)
+    {
+        if (!is_array($_result)) {
+            return array();
+        }
+
+        $result = array();
+
+        for ($x = 0; $x < $_result['count']; $x++) {
+            $dn = $_result[$x]['dn'];
+            $result[$dn] = array();
+            for ($y = 0; $y < $_result[$x]['count']; $y++) {
+                $attr = $_result[$x][$y];
+                if ($_result[$x][$attr]['count'] == 1) {
+                    switch ($attr) {
+                        case 'objectclass':
+                            $result[$dn][$attr] = array(strtolower($_result[$x][$attr][0]));
+                            break;
+                        default:
+                            $result[$dn][$attr] = $_result[$x][$attr][0];
+                            break;
+                    }
+                }
+                else {
+                    $result[$dn][$attr] = array();
+                    for ($z = 0; $z < $_result[$x][$attr]['count']; $z++) {
+                        switch ($attr) {
+                            case 'objectclass':
+                                $result[$dn][$attr][] = strtolower($_result[$x][$attr][$z]);
+                                break;
+                            default:
+                                $result[$dn][$attr][] = $_result[$x][$attr][$z];
+                                break;
+                        }
+                    }
+                }
+            }
+        }
+
+        return $result;
+    }
+
+    public static function scopeint2str($scope)
+    {
+        switch ($scope) {
+            case 2:
+                return 'sub';
+                break;
+            case 1:
+                return 'one';
+                break;
+            case 0:
+                return 'base';
+                break;
+            default:
+                $this->_debug("Scope $scope is not a valid scope integer");
+                break;
+        }
+    }
+
+    /**
+     * Choose the right PHP function according to scope property
+     *
+     * @param string $scope         The LDAP scope (sub|base|list)
+     * @param string $ns_function   Function to be used for numSubOrdinates queries
+     * @return string  PHP function to be used to query directory
+     */
+    public static function scope_to_function($scope, &$ns_function = null)
+    {
+        switch ($scope) {
+            case 'sub':
+                $function = $ns_function  = 'ldap_search';
+                break;
+            case 'base':
+                $function = $ns_function = 'ldap_read';
+                break;
+            case 'one':
+            case 'list':
+            default:
+                $function    = 'ldap_list';
+                $ns_function = 'ldap_read';
+                break;
+        }
+
+        return $function;
+    }
+
+    private function config_set_config_get_hook($callback)
+    {
+        $this->_config_get_hook = $callback;
+    }
+
+    private function config_set_config_set_hook($callback)
+    {
+        $this->_config_set_hook = $callback;
+    }
+
+    /**
+     * Sets the debug level both for this class and the ldap connection.
+     */
+    private function config_set_debug($value)
+    {
+        $this->config['debug'] = (bool) $value;
+        if ((int)($value) > 0) {
+            ldap_set_option(null, LDAP_OPT_DEBUG_LEVEL, (int)($value));
+        }
+    }
+
+    /**
+     *  Sets a log hook that is called with every log message in this module.
+     */
+    private function config_set_log_hook($callback)
+    {
+        $this->_log_hook = $callback;
+    }
+
+    /**
+     * Find a matching VLV
+     */
+    protected function find_vlv($base_dn, $filter, $scope, $sort_attrs = null)
+    {
+        if ($scope == 'base') {
+            return false;
+        }
+
+        $vlv_indexes = $this->find_vlv_indexes_and_searches();
+
+        if (empty($vlv_indexes)) {
+            return false;
+        }
+
+        $this->_debug("Existing vlv index and search information", $vlv_indexes);
+
+        $filter = strtolower($filter);
+
+        foreach ($vlv_indexes as $vlv_index) {
+            if (!empty($vlv_index[$base_dn])) {
+                $this->_debug("Found a VLV for base_dn: " . $base_dn);
+                if ($vlv_index[$base_dn]['filter'] == $filter) {
+                    if ($vlv_index[$base_dn]['scope'] == $scope) {
+                        $this->_debug("Scope and filter matches");
+
+                        // Not passing any sort attributes means you don't care
+                        if (!empty($sort_attrs)) {
+                            $sort_attrs = (array) $sort_attrs;
+                            if (count(array_intersect($sort_attrs, $vlv_index[$base_dn]['sort'])) == count($sort_attrs)) {
+                                return $sort_attrs;
+                            }
+                            else {
+                                return false;
+                            }
+                        }
+                        else {
+                            return $vlv_index[$base_dn]['sort'][0];
+                        }
+                    }
+                    else {
+                        $this->_debug("Scope does not match. VLV: " . var_export($vlv_index[$base_dn]['scope'], true)
+                            . " while looking for " . var_export($scope, true));
+                        return false;
+                    }
+                }
+                else {
+                    $this->_debug("Filter does not match");
+                }
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Return VLV indexes and searches including necessary configuration
+     * details.
+     */
+    protected function find_vlv_indexes_and_searches()
+    {
+        if ($this->config['vlv'] === false) {
+            return false;
+        }
+
+        if (is_array($this->config['vlv'])) {
+            return $this->config['vlv'];
+        }
+
+        if ($this->_vlv_indexes_and_searches !== null) {
+            return $this->_vlv_indexes_and_searches;
+        }
+
+        $this->_vlv_indexes_and_searches = array();
+
+        $config_root_dn = $this->config_get('config_root_dn');
+
+        if (empty($config_root_dn)) {
+            return array();
+        }
+
+        if ($this->cache && ($cached_config = $this->cache->get('vlvconfig'))) {
+            $this->_vlv_indexes_and_searches = $cached_config;
+            return $this->_vlv_indexes_and_searches;
+        }
+
+        $this->_debug("No VLV information available yet, refreshing");
+
+        $search_filter = '(objectclass=vlvsearch)';
+        $search_result = ldap_search($this->conn, $config_root_dn, $search_filter, array('*'), 0, 0, 0);
+
+        if ($search_result === false) {
+            $this->_debug("Search for '$search_filter' on '$config_root_dn' failed:".ldap_error($this->conn));
+            return;
+        }
+
+        $vlv_searches = new Net_LDAP3_Result($this->conn, $config_root_dn, $search_filter, 'sub', $search_result);
+
+        if ($vlv_searches->count() < 1) {
+            $this->_debug("Empty result from search for '(objectclass=vlvsearch)' on '$config_root_dn'");
+            return;
+        }
+
+        $index_filter = '(objectclass=vlvindex)';
+
+        foreach ($vlv_searches->entries(true) as $vlv_search_dn => $vlv_search_attrs) {
+            // The attributes we are interested in are as follows:
+            $_vlv_base_dn = $vlv_search_attrs['vlvbase'];
+            $_vlv_scope   = $vlv_search_attrs['vlvscope'];
+            $_vlv_filter  = $vlv_search_attrs['vlvfilter'];
+
+            // Multiple indexes may exist
+            $index_result = ldap_search($this->conn, $vlv_search_dn, $index_filter, array('*'), 0, 0, 0);
+
+            if ($index_result === false) {
+                $this->_debug("Search for '$index_filter' on '$vlv_search_dn' failed:".ldap_error($this->conn));
+                continue;
+            }
+
+            $vlv_indexes = new Net_LDAP3_Result($this->conn, $vlv_search_dn, $index_filter, 'sub', $index_result);
+            $vlv_indexes = $vlv_indexes->entries(true);
+
+            // Reset this one for each VLV search.
+            $_vlv_sort = array();
+
+            foreach ($vlv_indexes as $vlv_index_dn => $vlv_index_attrs) {
+                $_vlv_sort[] = explode(' ', $vlv_index_attrs['vlvsort']);
+            }
+
+            $this->_vlv_indexes_and_searches[] = array(
+                    $_vlv_base_dn => array(
+                            'scope'  => self::scopeint2str($_vlv_scope),
+                            'filter' => strtolower($_vlv_filter),
+                            'sort'   => $_vlv_sort,
+                        ),
+                );
+        }
+
+        // cache this
+        if ($this->cache) {
+            $this->cache->set('vlvconfig', $this->_vlv_indexes_and_searches);
+        }
+
+        return $this->_vlv_indexes_and_searches;
+    }
+
+    private function init_schema()
+    {
+        // use PEAR include if autoloading failed
+        if (!class_exists('Net_LDAP2')) {
+            require_once('Net/LDAP2.php');
+        }
+
+        $port = $this->config_get('port', 389);
+        $tls  = $this->config_get('use_tls', false);
+
+        foreach ((array) $this->config_get('hosts') as $host) {
+            $this->_debug("C: Connect [$host:$port]");
+
+            $_ldap_cfg = array(
+                'host'   => $host,
+                'port'   => $port,
+                'tls'    => $tls,
+                'version' => 3,
+                'binddn' => $this->config_get('service_bind_dn'),
+                'bindpw' => $this->config_get('service_bind_pw')
+            );
+
+            $_ldap_schema_cache_cfg = array(
+                'path' => "/tmp/" . $host . ":" . ($port ? $port : '389') . "-Net_LDAP2_Schema.cache",
+                'max_age' => 86400,
+            );
+
+            $_ldap = Net_LDAP2::connect($_ldap_cfg);
+
+            if (!is_a($_ldap, 'Net_LDAP2_Error')) {
+                $this->_debug("S: OK");
+                break;
+            }
+
+            $this->_debug("S: NOT OK");
+            $this->_debug($_ldap->getMessage());
+        }
+
+        if (is_a($_ldap, 'Net_LDAP2_Error')) {
+            return null;
+        }
+
+        $_ldap_schema_cache = new Net_LDAP2_SimpleFileSchemaCache($_ldap_schema_cache_cfg);
+
+        $_ldap->registerSchemaCache($_ldap_schema_cache);
+
+        // TODO: We should learn what LDAP tech. we're running against.
+        // Perhaps with a scope base objectclass recognize rootdse entry
+        $schema_root_dn = $this->config_get('schema_root_dn');
+
+        if (!$schema_root_dn) {
+            $_schema = $_ldap->schema();
+        }
+
+        return $_schema;
+    }
+
+    private function list_group_member($dn, $members, $recurse = true)
+    {
+        $this->_debug("Called list_group_member(" . $dn . ")");
+
+        $members       = (array) $members;
+        $group_members = array();
+
+        // remove possible 'count' item
+        unset($members['count']);
+
+        // Use the member attributes to return an array of member ldap objects
+        // NOTE that the member attribute is supposed to contain a DN
+        foreach ($members as $member) {
+            $member_entry = $this->get_entry($member, array('member', 'uniquemember', 'memberurl', 'objectclass'));
+
+            if (empty($member_entry)) {
+                continue;
+            }
+
+            $group_members[$member] = $member;
+
+            if ($recurse) {
+                // Nested groups
+                $group_group_members = $this->list_group_members($member, $member_entry);
+                if ($group_group_members) {
+                    $group_members = array_merge($group_group_members, $group_members);
+                }
+            }
+        }
+
+        return array_filter($group_members);
+    }
+
+    private function list_group_uniquemember($dn, $uniquemembers, $recurse = true)
+    {
+        $this->_debug("Called list_group_uniquemember(" . $dn . ")", $entry);
+
+        $uniquemembers = (array)($uniquemembers);
+        $group_members = array();
+
+        // remove possible 'count' item
+        unset($uniquemembers['count']);
+
+        foreach ($uniquemembers as $member) {
+            $member_entry = $this->get_entry($member, array('member', 'uniquemember', 'memberurl', 'objectclass'));
+
+            if (empty($member_entry)) {
+                continue;
+            }
+
+            $group_members[$member] = $member;
+
+            if ($recurse) {
+                // Nested groups
+                $group_group_members = $this->list_group_members($member, $member_entry);
+                if ($group_group_members) {
+                    $group_members = array_merge($group_group_members, $group_members);
+                }
+            }
+        }
+
+        return array_filter($group_members);
+    }
+
+    private function list_group_memberurl($dn, $memberurls, $recurse = true)
+    {
+        $this->_debug("Called list_group_memberurl(" . $dn . ")");
+
+        $group_members = array();
+        $memberurls    = (array) $memberurls;
+        $attributes    = array('member', 'uniquemember', 'memberurl', 'objectclass');
+
+        // remove possible 'count' item
+        unset($memberurls['count']);
+
+        foreach ($memberurls as $url) {
+            $ldap_uri = $this->parse_memberurl($url);
+            $result   = $this->search($ldap_uri[3], $ldap_uri[6], 'sub', $attributes);
+
+            if (!$result) {
+                continue;
+            }
+
+            foreach ($result->entries(true) as $entry_dn => $_entry) {
+                $group_members[$entry_dn] = $entry_dn;
+                $this->_debug("Found " . $entry_dn);
+
+                if ($recurse) {
+                    // Nested group
+                    $group_group_members = $this->list_group_members($entry_dn, $_entry);
+                    if ($group_group_members) {
+                        $group_members = array_merge($group_members, $group_group_members);
+                    }
+                }
+            }
+        }
+
+        return array_filter($group_members);
+    }
+
+    /**
+     * memberUrl attribute parser
+     *
+     * @param string $url URL string
+     *
+     * @return array URL elements
+     */
+    private function parse_memberurl($url)
+    {
+        preg_match('/(.*):\/\/(.*)\/(.*)\?(.*)\?(.*)\?(.*)/', $url, $matches);
+        return $matches;
+    }
+
+    private function modify_entry_attributes($subject_dn, $attributes)
+    {
+        // Opportunities to set false include failed ldap commands.
+        $result = true;
+
+        if (is_array($attributes['rename']) && !empty($attributes['rename'])) {
+            $olddn  = $attributes['rename']['dn'];
+            $newrdn = $attributes['rename']['new_rdn'];
+
+            if (!empty($attributes['rename']['new_parent'])) {
+                $new_parent = $attributes['rename']['new_parent'];
+            }
+            else {
+                $new_parent = null;
+            }
+
+            $this->_debug("LDAP: C: Rename $olddn to $newrdn,$new_parent");
+
+            $result = ldap_rename($this->conn, $olddn, $newrdn, $new_parent, true);
+
+            if ($result) {
+                $this->_debug("LDAP: S: OK");
+
+                if ($new_parent) {
+                    $subject_dn = $newrdn . ',' . $new_parent;
+                }
+                else {
+                    $old_parent_dn_components = ldap_explode_dn($olddn, 0);
+                    unset($old_parent_dn_components["count"]);
+                    $old_rdn       = array_shift($old_parent_dn_components);
+                    $old_parent_dn = implode(",", $old_parent_dn_components);
+                    $subject_dn    = $newrdn . ',' . $old_parent_dn;
+                }
+            }
+            else {
+                $this->_debug("LDAP: S: " . ldap_error($this->conn));
+                $this->_warning("LDAP: Failed to rename $olddn to $newrdn,$new_parent");
+                return false;
+            }
+        }
+
+        if (is_array($attributes['replace']) && !empty($attributes['replace'])) {
+            $this->_debug("LDAP: C: Mod-Replace $subject_dn: " . json_encode($attributes['replace']));
+
+            $result = ldap_mod_replace($this->conn, $subject_dn, $attributes['replace']);
+
+            if ($result) {
+                $this->_debug("LDAP: S: OK");
+            }
+            else {
+                $this->_debug("LDAP: S: " . ldap_error($this->conn));
+                $this->_warning("LDAP: Failed to replace attributes on $subject_dn: " . json_encode($attributes['replace']));
+                return false;
+            }
+        }
+
+        if (is_array($attributes['del']) && !empty($attributes['del'])) {
+            $this->_debug("LDAP: C: Mod-Delete $subject_dn: " . json_encode($attributes['del']));
+
+            $result = ldap_mod_del($this->conn, $subject_dn, $attributes['del']);
+
+            if ($result) {
+                $this->_debug("LDAP: S: OK");
+            }
+            else {
+                $this->_debug("LDAP: S: " . ldap_error($this->conn));
+                $this->_warning("LDAP: Failed to delete attributes on $subject_dn: " . json_encode($attributes['del']));
+                return false;
+            }
+        }
+
+        if (is_array($attributes['add']) && !empty($attributes['add'])) {
+            $this->_debug("LDAP: C: Mod-Add $subject_dn: " . json_encode($attributes['add']));
+
+            $result = ldap_mod_add($this->conn, $subject_dn, $attributes['add']);
+
+            if ($result) {
+                $this->_debug("LDAP: S: OK");
+            }
+            else {
+                $this->_debug("LDAP: S: " . ldap_error($this->conn));
+                $this->_warning("LDAP: Failed to add attributes on $subject_dn: " . json_encode($attributes['add']));
+                return false;
+            }
+        }
+
+        return true;
+    }
+
+    private function parse_attribute_level_rights($attribute_value)
+    {
+        $attribute_value  = str_replace(", ", ",", $attribute_value);
+        $attribute_values = explode(",", $attribute_value);
+        $attribute_value  = array();
+
+        foreach ($attribute_values as $access_right) {
+            $access_right_components = explode(":", $access_right);
+            $access_attribute        = strtolower(array_shift($access_right_components));
+            $access_value            = array_shift($access_right_components);
+
+            $attribute_value[$access_attribute] = array();
+
+            for ($i = 0; $i < strlen($access_value); $i++) {
+                $method = $this->attribute_level_rights_map[substr($access_value, $i, 1)];
+
+                if (!in_array($method, $attribute_value[$access_attribute])) {
+                    $attribute_value[$access_attribute][] = $method;
+                }
+            }
+        }
+
+        return $attribute_value;
+    }
+
+    private function parse_entry_level_rights($attribute_value)
+    {
+        $_attribute_value = array();
+
+        for ($i = 0; $i < strlen($attribute_value); $i++) {
+            $method = $this->entry_level_rights_map[substr($attribute_value, $i, 1)];
+
+            if (!in_array($method, $_attribute_value)) {
+                $_attribute_value[] = $method;
+            }
+        }
+
+        return $_attribute_value;
+    }
+
+    private function supported_controls()
+    {
+        if (!empty($this->supported_controls)) {
+            return $this->supported_controls;
+        }
+
+        $this->_info("Obtaining supported controls");
+
+        if ($result = $this->search('', '(objectclass=*)', 'base', array('supportedcontrol'))) {
+            $result  = $result->entries(true);
+            $control = $result['']['supportedcontrol'];
+        }
+        else {
+            $control = array();
+        }
+
+        $this->_info("Obtained " . count($control) . " supported controls");
+        $this->supported_controls = $control;
+
+        return $control;
+    }
+
+    protected function _alert()
+    {
+        $this->__log(LOG_ALERT, func_get_args());
+    }
+
+    protected function _critical()
+    {
+        $this->__log(LOG_CRIT, func_get_args());
+    }
+
+    protected function _debug()
+    {
+        $this->__log(LOG_DEBUG, func_get_args());
+    }
+
+    protected function _emergency()
+    {
+        $this->__log(LOG_EMERG, func_get_args());
+    }
+
+    protected function _error()
+    {
+        $this->__log(LOG_ERR, func_get_args());
+    }
+
+    protected function _info()
+    {
+        $this->__log(LOG_INFO, func_get_args());
+    }
+
+    protected function _notice()
+    {
+        $this->__log(LOG_NOTICE, func_get_args());
+    }
+
+    protected function _warning()
+    {
+        $this->__log(LOG_WARNING, func_get_args());
+    }
+
+    /**
+     *  Log a message.
+     */
+    private function __log($level, $args)
+    {
+        $msg = array();
+
+        foreach ($args as $arg) {
+            $msg[] = !is_string($arg) ? var_export($arg, true) : $arg;
+        }
+
+        if (!empty($this->_log_hook)) {
+            call_user_func_array($this->_log_hook, array($level, $msg));
+            return;
+        }
+
+        if ($this->debug_level > 0) {
+            syslog($level, implode("\n", $msg));
+        }
+    }
+
+    /**
+     * Add BER sequence with correct length and the given identifier
+     */
+    private static function _ber_addseq($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;
+    }
+
+    /**
+     * Quotes attribute value string
+     *
+     * @param string $str Attribute value
+     * @param bool   $dn  True if the attribute is a DN
+     *
+     * @return string Quoted string
+     */
+    public static function quote_string($str, $is_dn = false)
+    {
+        // take firt entry if array given
+        if (is_array($str)) {
+            $str = reset($str);
+        }
+
+        if ($is_dn) {
+            $replace = array(
+                ',' => '\2c',
+                '=' => '\3d',
+                '+' => '\2b',
+                '<' => '\3c',
+                '>' => '\3e',
+                ';' => '\3b',
+                "\\"=> '\5c',
+                '"' => '\22',
+                '#' => '\23'
+            );
+        }
+        else {
+            $replace = array(
+                '*' => '\2a',
+                '(' => '\28',
+                ')' => '\29',
+                "\\" => '\5c',
+                '/' => '\2f'
+            );
+        }
+
+        return strtr($str, $replace);
+    }
+
+    /**
+     * create ber encoding for sort control
+     *
+     * @param array List of cols to sort by
+     * @return string BER encoded option value
+     */
+    private static function _sort_ber_encode($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), $str);
+    }
+
+    /**
+     * Returns ascii string encoded in hex
+     */
+    private static function _string2hex($str)
+    {
+        $hex = '';
+        for ($i=0; $i < strlen($str); $i++)
+            $hex .= dechex(ord($str[$i]));
+
+        return $hex;
+    }
+
+    /**
+     * Generate BER encoded string for Virtual List View option
+     *
+     * @param integer List offset (first record)
+     * @param integer Records per page
+     * @return string BER encoded option value
+     */
+    private static function _vlv_ber_encode($offset, $rpp, $search = '')
+    {
+        // This string is ber-encoded, php will prefix this value with:
+        // 04 (octet string) and 10 (length of 16 bytes)
+        // the code behind this string is broken down as follows:
+        // 30 = ber sequence with a length of 0e (14) bytes following
+        // 02 = type integer (in two's complement form) with 2 bytes following (beforeCount): 01 00 (ie 0)
+        // 02 = type integer (in two's complement form) with 2 bytes following (afterCount):  01 18 (ie 25-1=24)
+        // a0 = type context-specific/constructed with a length of 06 (6) bytes following
+        // 02 = type integer with 2 bytes following (offset): 01 01 (ie 1)
+        // 02 = type integer with 2 bytes following (contentCount):  01 00
+
+        // whith a search string present:
+        // 81 = type context-specific/constructed with a length of 04 (4) bytes following (the length will change here)
+        // 81 indicates a user string is present where as a a0 indicates just a offset search
+        // 81 = type context-specific/constructed with a length of 06 (6) bytes following
+
+        // the following info was taken from the ISO/IEC 8825-1:2003 x.690 standard re: the
+        // encoding of integer values (note: these values are in
+        // two-complement form so since offset will never be negative bit 8 of the
+        // leftmost octet should never by set to 1):
+        // 8.3.2: If the contents octets of an integer value encoding consist
+        // of more than one octet, then the bits of the first octet (rightmost) and bit 8
+        // of the second (to the left of first octet) octet:
+        // a) shall not all be ones; and
+        // b) shall not all be zero
+
+        if ($search) {
+            $search  = preg_replace('/[^-[:alpha:] ,.()0-9]+/', '', $search);
+            $ber_val = self::_string2hex($search);
+            $str     = self::_ber_addseq($ber_val, '81');
+        }
+        else {
+            // construct the string from right to left
+            $str = "020100"; # contentCount
+
+            // returns encoded integer value in hex format
+            $ber_val = self::_ber_encode_int($offset);
+
+            // 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
+        $str = "020100" . self::_ber_addseq(self::_ber_encode_int($rpp-1), '02') . $str;
+
+        // now tack on sequence identifier and length
+        $str = self::_ber_addseq($str, '30');
+
+        return pack('H'.strlen($str), $str);
+    }
+
+    private function _fuzzy_search_prefix()
+    {
+        switch ($this->config_get("fuzzy_search", 2)) {
+            case 2:
+                return "*";
+                break;
+            case 1:
+            case 0:
+            default:
+                return "";
+                break;
+        }
+    }
+
+    private function _fuzzy_search_suffix()
+    {
+        switch ($this->config_get("fuzzy_search", 2)) {
+            case 2:
+                return "*";
+                break;
+            case 1:
+                return "*";
+            case 0:
+            default:
+                return "";
+                break;
+        }
+    }
+
+    /**
+     * Return the search string value to be used in VLV controls
+     */
+    private function _vlv_search($sort, $search)
+    {
+        if (!empty($this->additional_filter)) {
+            $this->_debug("Not setting a VLV search filter because we already have a filter");
+            return;
+        }
+
+        if (empty($search)) {
+            return;
+        }
+
+        $search_suffix = $this->_fuzzy_search_suffix();
+
+        foreach ($search as $attr => $value) {
+            if (!in_array(strtolower($attr), $sort)) {
+                $this->_debug("Cannot use VLV search using attribute not indexed: $attr (not in " . var_export($sort, true) . ")");
+                return;
+            }
+            else {
+                return $value . $search_suffix;
+            }
+        }
+    }
+
+    /**
+     * Set server controls for Virtual List View (paginated listing)
+     */
+    private function _vlv_set_controls($sort, $list_page, $page_size, $search = null)
+    {
+        $sort_ctrl = array(
+            'oid'   => "1.2.840.113556.1.4.473",
+            'value' => self::_sort_ber_encode($sort)
+        );
+
+        if (!empty($search)) {
+            $this->_debug("_vlv_set_controls to include search: " . var_export($search, true));
+        }
+
+        $vlv_ctrl  = array(
+            'oid' => "2.16.840.1.113730.3.4.9",
+            'value' => self::_vlv_ber_encode(
+                    $offset = ($list_page-1) * $page_size + 1,
+                    $page_size,
+                    $search
+            ),
+            'iscritical' => true
+        );
+
+        $this->_debug("C: set controls sort=" . join(' ', unpack('H'.(strlen($sort_ctrl['value'])*2), $sort_ctrl['value']))
+            . " (" . implode(',', (array) $sort) . ");"
+            . " vlv=" . join(' ', (unpack('H'.(strlen($vlv_ctrl['value'])*2), $vlv_ctrl['value']))) . " ($offset/$page_size)");
+
+        if (!ldap_set_option($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;
+    }
+
+}
diff --git a/program/lib/Roundcube/rcube_ldap_result.php b/program/lib/Net/LDAP3/Result.php
index efc3331bc..728b30442 100644
--- a/program/lib/Roundcube/rcube_ldap_result.php
+++ b/program/lib/Net/LDAP3/Result.php
@@ -2,106 +2,115 @@
 
 /*
  +-----------------------------------------------------------------------+
- | Roundcube/rcube_ldap_result.php                                       |
+ | Net/LDAP3/Result.php                                                  |
  |                                                                       |
- | This file is part of the Roundcube Webmail client                     |
- | Copyright (C) 2006-2013, The Roundcube Dev Team                       |
- | Copyright (C) 2013, Kolab Systems AG                                  |
+ | Based on code created by the Roundcube Webmail team.                  |
+ |                                                                       |
+ | Copyright (C) 2006-2014, The Roundcube Dev Team                       |
+ | Copyright (C) 2012-2014, Kolab Systems AG                             |
  |                                                                       |
  | Licensed under the GNU General Public License version 3 or            |
- | any later version with exceptions for skins & plugins.                |
+ | any later version with exceptions for plugins.                        |
  | See the README file for a full license statement.                     |
  |                                                                       |
  | PURPOSE:                                                              |
- |   Model class that represents an LDAP search result                   |
+ |   Provide advanced functionality for accessing LDAP directories       |
  |                                                                       |
  +-----------------------------------------------------------------------+
- | Author: Thomas Bruederli <roundcube@gmail.com>                        |
+ | Authors: Thomas Bruederli <roundcube@gmail.com>                       |
+ |          Jeroen van Meeuwen <vanmeeuwen@kolabsys.com>                 |
  +-----------------------------------------------------------------------+
 */
 
-
 /**
  * Model class representing an LDAP search result
  *
- * @package    Framework
- * @subpackage LDAP
+ * @package LDAP
  */
-class rcube_ldap_result implements Iterator
+class Net_LDAP3_Result implements Iterator
 {
-    public $conn;
-    public $ldap;
-    public $base_dn;
-    public $filter;
+    protected $conn;
+    protected $base_dn;
+    protected $filter;
+    protected $scope;
 
-    private $count = null;
-    private $current = null;
+    private $count;
+    private $current;
     private $iteratorkey = 0;
 
     /**
      * Default constructor
      *
-     * @param resource $conn LDAP link identifier
-     * @param resource $ldap LDAP result entry identifier
+     * @param resource $conn      LDAP link identifier
      * @param string   $base_dn   Base DN used to get this result
      * @param string   $filter    Filter query used to get this result
-     * @param integer  $count     Record count value (pre-calculated)
+     * @param string   $scope     Scope of the result
+     * @param resource $result    LDAP result entry identifier
      */
-    function __construct($conn, $ldap, $base_dn, $filter, $count = null)
+    function __construct($conn, $base_dn, $filter, $scope, $result)
     {
-        $this->conn = $conn;
-        $this->ldap = $ldap;
+        $this->conn    = $conn;
         $this->base_dn = $base_dn;
-        $this->filter = $filter;
-        $this->count = $count;
+        $this->filter  = $filter;
+        $this->scope   = $scope;
+        $this->result  = $result;
+    }
+
+    public function get($property, $default = null)
+    {
+        if (isset($this->$property)) {
+            return $this->$property;
+        } else {
+            return $default;
+        }
+    }
+
+    public function set($property, $value)
+    {
+        $this->$property = $value;
     }
 
     /**
-     * Wrapper for ldap_sort()
+     *
      */
     public function sort($attr)
     {
-        return ldap_sort($this->conn, $this->ldap, $attr);
+        return ldap_sort($this->conn, $this->result, $attr);
     }
 
     /**
-     * Get entries count
+     *
      */
     public function count()
     {
         if (!isset($this->count))
-            $this->count = ldap_count_entries($this->conn, $this->ldap);
+            $this->count = ldap_count_entries($this->conn, $this->result);
 
         return $this->count;
     }
 
     /**
-     * Wrapper for ldap_get_entries()
      *
-     * @param boolean $normalize Optionally normalize the entries to a list of hash arrays
-     * @return array  List of LDAP entries
      */
     public function entries($normalize = false)
     {
-        $entries = ldap_get_entries($this->conn, $this->ldap);
-        return $normalize ? rcube_ldap_generic::normalize_result($entries) : $entries;
-    }
+        $entries = ldap_get_entries($this->conn, $this->result);
 
-    /**
-     * Wrapper for ldap_get_dn() using the current entry pointer
-     */
-    public function get_dn()
-    {
-        return $this->current ? ldap_get_dn($this->conn, $this->current) : null;
+        if ($normalize) {
+            return Net_LDAP3::normalize_result($entries);
+        }
+
+        return $entries;
     }
 
 
-    /***  Implements the PHP 5 Iterator interface to make foreach work  ***/
+    /***  Implement PHP 5 Iterator interface to make foreach work  ***/
 
     function current()
     {
-        $attrib = ldap_get_attributes($this->conn, $this->current);
+        $attrib       = ldap_get_attributes($this->conn, $this->current);
         $attrib['dn'] = ldap_get_dn($this->conn, $this->current);
+
         return $attrib;
     }
 
@@ -113,7 +122,7 @@ class rcube_ldap_result implements Iterator
     function rewind()
     {
         $this->iteratorkey = 0;
-        $this->current = ldap_first_entry($this->conn, $this->ldap);
+        $this->current = ldap_first_entry($this->conn, $this->result);
     }
 
     function next()
diff --git a/program/lib/Roundcube/rcube_ldap.php b/program/lib/Roundcube/rcube_ldap.php
index 5a4b9dd61..7fdcbc806 100644
--- a/program/lib/Roundcube/rcube_ldap.php
+++ b/program/lib/Roundcube/rcube_ldap.php
@@ -232,8 +232,7 @@ class rcube_ldap extends rcube_addressbook
 
         // initialize ldap wrapper object
         $this->ldap = new rcube_ldap_generic($this->prop);
-        $this->ldap->set_cache($this->cache);
-        $this->ldap->set_debug($this->debug);
+        $this->ldap->config_set(array('cache' => $this->cache, 'debug' => $this->debug));
 
         $this->_connect();
     }
@@ -320,8 +319,7 @@ class rcube_ldap extends rcube_addressbook
                             // we need to use a separate LDAP connection
                             if (!empty($this->prop['vlv'])) {
                                 $ldap = new rcube_ldap_generic($this->prop);
-                                $ldap->set_debug($this->debug);
-                                $ldap->set_cache($this->cache);
+                                $ldap->config_set(array('cache' => $this->cache, 'debug' => $this->debug));
                                 if (!$ldap->connect($host)) {
                                     continue;
                                 }
@@ -1066,7 +1064,7 @@ class rcube_ldap extends rcube_addressbook
             }
         }
 
-        if (!$this->ldap->add($dn, $newentry)) {
+        if (!$this->ldap->add_entry($dn, $newentry)) {
             $this->set_error(self::ERROR_SAVING, 'errorsaving');
             return false;
         }
@@ -1078,7 +1076,7 @@ class rcube_ldap extends rcube_addressbook
                 'objectClass' => (array) $this->prop['sub_fields'][$xidx],
             );
 
-            $this->ldap->add($xdn, $xf);
+            $this->ldap->add_entry($xdn, $xf);
         }
 
         $dn = self::dn_encode($dn);
@@ -1221,7 +1219,7 @@ class rcube_ldap extends rcube_addressbook
         if (!empty($subdeldata)) {
             foreach ($subdeldata as $fld => $val) {
                 $subdn = $fld.'='.rcube_ldap_generic::quote_string($val).','.$dn;
-                if (!$this->ldap->delete($subdn)) {
+                if (!$this->ldap->delete_entry($subdn)) {
                     return false;
                 }
             }
@@ -1265,7 +1263,7 @@ class rcube_ldap extends rcube_addressbook
                     $fld => $val,
                     'objectClass' => (array) $this->prop['sub_fields'][$fld],
                 );
-                $this->ldap->add($subdn, $xf);
+                $this->ldap->add_entry($subdn, $xf);
             }
         }
 
@@ -1295,7 +1293,7 @@ class rcube_ldap extends rcube_addressbook
             if ($this->sub_filter) {
                 if ($entries = $this->ldap->list_entries($dn, $this->sub_filter)) {
                     foreach ($entries as $entry) {
-                        if (!$this->ldap->delete($entry['dn'])) {
+                        if (!$this->ldap->delete_entry($entry['dn'])) {
                             $this->set_error(self::ERROR_SAVING, 'errorsaving');
                             return false;
                         }
@@ -1304,12 +1302,12 @@ class rcube_ldap extends rcube_addressbook
             }
 
             // Delete the record.
-            if (!$this->ldap->delete($dn)) {
+            if (!$this->ldap->delete_entry($dn)) {
                 $this->set_error(self::ERROR_SAVING, 'errorsaving');
                 return false;
             }
 
-            // remove contact from all groups where he was member
+            // remove contact from all groups where he was a member
             if ($this->groups) {
                 $dn = self::dn_encode($dn);
                 $group_ids = $this->get_record_groups($dn);
@@ -1342,7 +1340,7 @@ class rcube_ldap extends rcube_addressbook
 
         if ($with_groups && $this->groups && ($groups = $this->_fetch_groups()) && count($groups)) {
             foreach ($groups as $group) {
-                $this->ldap->delete($group['dn']);
+                $this->ldap->delete_entry($group['dn']);
             }
 
             if ($this->cache) {
@@ -1567,7 +1565,7 @@ class rcube_ldap extends rcube_addressbook
         $this->debug = $dbg;
 
         if ($this->ldap) {
-            $this->ldap->set_debug($dbg);
+            $this->ldap->config_set('debug', $dbg);
         }
     }
 
@@ -1666,7 +1664,7 @@ class rcube_ldap extends rcube_addressbook
             }
 
             $ldap = clone $this->ldap;
-            $ldap->set_config($this->prop['groups']);
+            $ldap->config_set($this->prop['groups']);
             $ldap->set_vlv_page($vlv_page+1, $page_size);
         }
 
@@ -1790,7 +1788,7 @@ class rcube_ldap extends rcube_addressbook
             $member_attr => '',
         );
 
-        if (!$this->ldap->add($new_dn, $new_entry)) {
+        if (!$this->ldap->add_entry($new_dn, $new_entry)) {
             $this->set_error(self::ERROR_SAVING, 'errorsaving');
             return false;
         }
@@ -1813,7 +1811,7 @@ class rcube_ldap extends rcube_addressbook
         $group_cache = $this->_fetch_groups();
         $del_dn      = $group_cache[$group_id]['dn'];
 
-        if (!$this->ldap->delete($del_dn)) {
+        if (!$this->ldap->delete_entry($del_dn)) {
             $this->set_error(self::ERROR_SAVING, 'errorsaving');
             return false;
         }
diff --git a/program/lib/Roundcube/rcube_ldap_generic.php b/program/lib/Roundcube/rcube_ldap_generic.php
index 25fe2e5d2..a88e53c0e 100644
--- a/program/lib/Roundcube/rcube_ldap_generic.php
+++ b/program/lib/Roundcube/rcube_ldap_generic.php
@@ -5,8 +5,8 @@
  | Roundcube/rcube_ldap_generic.php                                      |
  |                                                                       |
  | This file is part of the Roundcube Webmail client                     |
- | Copyright (C) 2006-2013, The Roundcube Dev Team                       |
- | Copyright (C) 2012-2013, Kolab Systems AG                             |
+ | Copyright (C) 2006-2014, The Roundcube Dev Team                       |
+ | Copyright (C) 2012-2014, Kolab Systems AG                             |
  |                                                                       |
  | Licensed under the GNU General Public License version 3 or            |
  | any later version with exceptions for skins & plugins.                |
@@ -21,464 +21,124 @@
  +-----------------------------------------------------------------------+
 */
 
-
-/*
-  LDAP connection properties
-  --------------------------
-
-  $prop = array(
-      'host'            => '<ldap-server-address>',
-      // or
-      'hosts'           => array('directory.verisign.com'),
-      'port'            => 389,
-      'use_tls'         => true|false,
-      'ldap_version'    => 3,             // using LDAPv3
-      'auth_method'     => '',            // SASL authentication method (for proxy auth), e.g. DIGEST-MD5
-      'attributes'      => array('dn'),   // List of attributes to read from the server
-      'vlv'             => false,         // Enable Virtual List View to more efficiently fetch paginated data (if server supports it)
-      'config_root_dn'  => 'cn=config',   // Root DN to read config (e.g. vlv indexes) from
-      'numsub_filter'   => '(objectClass=organizationalUnit)',   // with VLV, we also use numSubOrdinates to query the total number of records. Set this filter to get all numSubOrdinates attributes for counting
-      'sizelimit'       => '0',           // Enables you to limit the count of entries fetched. Setting this to 0 means no limit.
-      'timelimit'       => '0',           // Sets the number of seconds how long is spend on the search. Setting this to 0 means no limit.
-      'network_timeout' => 10,            // The timeout (in seconds) for connect + bind arrempts. This is only supported in PHP >= 5.3.0 with OpenLDAP 2.x
-      'referrals'       => true|false,    // Sets the LDAP_OPT_REFERRALS option. Mostly used in multi-domain Active Directory setups
-  );
-*/
-
 /**
  * Model class to access an LDAP directories
  *
  * @package    Framework
  * @subpackage LDAP
  */
-class rcube_ldap_generic
+class rcube_ldap_generic extends Net_LDAP3
 {
-    const UPDATE_MOD_ADD = 1;
-    const UPDATE_MOD_DELETE = 2;
-    const UPDATE_MOD_REPLACE = 4;
-    const UPDATE_MOD_FULL = 7;
-
-    public $conn;
-    public $vlv_active = false;
-
     /** private properties */
     protected $cache = null;
-    protected $config = array();
     protected $attributes = array('dn');
-    protected $entries = null;
-    protected $result = null;
-    protected $debug = false;
-    protected $list_page = 1;
-    protected $page_size = 10;
-    protected $vlv_config = null;
-
 
-    /**
-    * Object constructor
-    *
-    * @param array $p LDAP connection properties
-    */
-    function __construct($p)
+    function __construct($config = null)
     {
-        $this->config = $p;
+        parent::__construct($config);
 
-        if (is_array($p['attributes']))
-            $this->attributes = $p['attributes'];
-
-        if (!is_array($p['hosts']) && !empty($p['host']))
-            $this->config['hosts'] = array($p['host']);
+        $this->config_set('log_hook', array($this, 'log'));
     }
 
     /**
-     * Activate/deactivate debug mode
-     *
-     * @param boolean $dbg True if LDAP commands should be logged
+     * Establish a connection to the LDAP server
      */
-    public function set_debug($dbg = true)
-    {
-        $this->debug = $dbg;
-    }
-
-    /**
-     * Set connection options
-     *
-     * @param mixed $opt Option name as string or hash array with multiple options
-     * @param mixed $val Option value
-     */
-    public function set_config($opt, $val = null)
-    {
-        if (is_array($opt))
-            $this->config = array_merge($this->config, $opt);
-        else
-            $this->config[$opt] = $value;
-    }
-
-    /**
-     * Enable caching by passing an instance of rcube_cache to be used by this object
-     *
-     * @param object rcube_cache Instance or False to disable caching
-     */
-    public function set_cache($cache_engine)
-    {
-        $this->cache = $cache_engine;
-    }
-
-    /**
-     * Set properties for VLV-based paging
-     *
-     * @param  number $page  Page number to list (starting at 1)
-     * @param  number $size  Number of entries to display on one page
-     */
-    public function set_vlv_page($page, $size = 10)
-    {
-        $this->list_page = $page;
-        $this->page_size = $size;
-    }
-
-    /**
-    * Establish a connection to the LDAP server
-    */
     public function connect($host = null)
     {
-        if (!function_exists('ldap_connect')) {
-            rcube::raise_error(array('code' => 100, 'type' => 'ldap',
-                'file' => __FILE__, 'line' => __LINE__,
-                'message' => "No ldap support in this installation of PHP"),
-                true);
-            return false;
-        }
-
-        if (is_resource($this->conn) && $this->config['host'] == $host)
-            return true;
-
-        if (empty($this->config['ldap_version']))
-            $this->config['ldap_version'] = 3;
-
-        // iterate over hosts if none specified
-        if (!$host) {
-            if (!is_array($this->config['hosts']))
-                $this->config['hosts'] = array($this->config['hosts']);
-
-            foreach ($this->config['hosts'] as $host) {
-                if (!empty($host) && $this->connect($host)) {
-                    return true;
-                }
-            }
-
-            return false;
-        }
-
-        // open connection to the given $host
-        $host     = rcube_utils::idn_to_ascii(rcube_utils::parse_host($host));
-        $hostname = $host . ($this->config['port'] ? ':'.$this->config['port'] : '');
-
-        $this->_debug("C: Connect to $hostname [{$this->config['name']}]");
-
-        if ($lc = @ldap_connect($host, $this->config['port'])) {
-            if ($this->config['use_tls'] === true) {
-                if (!ldap_start_tls($lc)) {
-                    return false;
-                }
-            }
-
-            $this->_debug("S: OK");
-
-            ldap_set_option($lc, LDAP_OPT_PROTOCOL_VERSION, $this->config['ldap_version']);
-            $this->config['host'] = $host;
-            $this->conn = $lc;
-
-            if (!empty($this->config['network_timeout']))
-                ldap_set_option($lc, LDAP_OPT_NETWORK_TIMEOUT, $this->config['network_timeout']);
+        // Net_LDAP3 does not support IDNA yet
+        // also parse_host() here is very Roundcube specific
+        $host = rcube_utils::idn_to_ascii(rcube_utils::parse_host($host));
 
-            if (isset($this->config['referrals']))
-                ldap_set_option($lc, LDAP_OPT_REFERRALS, $this->config['referrals']);
-
-            if (isset($this->config['dereference']))
-                ldap_set_option($lc, LDAP_OPT_DEREF, $this->config['dereference']);
-        }
-        else {
-            $this->_debug("S: NOT OK");
-        }
-
-        if (!is_resource($this->conn)) {
-            rcube::raise_error(array('code' => 100, 'type' => 'ldap',
-                'file' => __FILE__, 'line' => __LINE__,
-                'message' => "Could not connect to any LDAP server, last tried $hostname"),
-                true);
-            return false;
-        }
-
-        return true;
+        return parent::connect($host);
     }
 
     /**
-     * Bind connection with (SASL-) user and password
+     * Get a specific LDAP entry, identified by its DN
      *
-     * @param string $authc Authentication user
-     * @param string $pass  Bind password
-     * @param string $authz Autorization user
+     * @param string $dn Record identifier
      *
-     * @return boolean True on success, False on error
+     * @return array Hash array
      */
-    public function sasl_bind($authc, $pass, $authz=null)
+    function get_entry($dn)
     {
-        if (!$this->conn) {
-            return false;
-        }
-
-        if (!function_exists('ldap_sasl_bind')) {
-            rcube::raise_error(array('code' => 100, 'type' => 'ldap',
-                'file' => __FILE__, 'line' => __LINE__,
-                'message' => "Unable to bind: ldap_sasl_bind() not exists"),
-                true);
-            return false;
-        }
-
-        if (!empty($authz)) {
-            $authz = 'u:' . $authz;
-        }
-
-        if (!empty($this->config['auth_method'])) {
-            $method = $this->config['auth_method'];
-        }
-        else {
-            $method = 'DIGEST-MD5';
-        }
-
-        $this->_debug("C: SASL Bind [mech: $method, authc: $authc, authz: $authz, pass: **** [" . strlen($pass) . "]");
-
-        if (ldap_sasl_bind($this->conn, NULL, $pass, $method, NULL, $authc, $authz)) {
-            $this->_debug("S: OK");
-            return true;
-        }
-
-        $this->_debug("S: ".ldap_error($this->conn));
-
-        rcube::raise_error(array(
-            'code' => ldap_errno($this->conn), 'type' => 'ldap',
-            'file' => __FILE__, 'line' => __LINE__,
-            'message' => "SASL Bind failed for authcid=$authc ".ldap_error($this->conn)),
-            true);
-        return false;
+        return parent::get_entry($dn, $this->attributes);
     }
 
     /**
-     * Bind connection with DN and password
-     *
-     * @param string $dn   Bind DN
-     * @param string $pass Bind password
-     *
-     * @return boolean True on success, False on error
+     * Prints debug/error info to the log
      */
-    public function bind($dn, $pass)
+    public function log($level, $msg)
     {
-        if (!$this->conn) {
-            return false;
-        }
-
-        $this->_debug("C: Bind $dn, pass: **** [" . strlen($pass) . "]");
-
-        if (@ldap_bind($this->conn, $dn, $pass)) {
-            $this->_debug("S: OK");
-            return true;
-        }
-
-        $this->_debug("S: ".ldap_error($this->conn));
+        $msg = implode("\n", $msg);
 
-        rcube::raise_error(array(
-            'code' => ldap_errno($this->conn), 'type' => 'ldap',
-            'file' => __FILE__, 'line' => __LINE__,
-            'message' => "Bind failed for dn=$dn: ".ldap_error($this->conn)),
-            true);
+        switch ($level) {
+        case LOG_DEBUG:
+        case LOG_INFO:
+        case LOG_NOTICE:
+            if ($this->config['debug']) {
+                rcube::write_log('ldap', $msg);
+            }
+            break;
 
-        return false;
-    }
+        case LOG_EMERGE:
+        case LOG_ALERT:
+        case LOG_CRIT:
+            rcube::raise_error($msg, true, true);
+            break;
 
-    /**
-     * Close connection to LDAP server
-     */
-    public function close()
-    {
-        if ($this->conn) {
-            $this->_debug("C: Close");
-            ldap_unbind($this->conn);
-            $this->conn = null;
+        case LOG_ERR:
+        case LOG_WARNING:
+            rcube::raise_error($msg, true, false);
+            break;
         }
     }
 
     /**
-     * Return the last result set
-     *
-     * @return object rcube_ldap_result Result object
+     * @deprecated
      */
-    function get_result()
+    public function set_debug($dbg = true)
     {
-        return $this->result;
+        $this->config['debug'] = (bool) $dbg;
     }
 
     /**
-     * Get a specific LDAP entry, identified by its DN
-     *
-     * @param string $dn Record identifier
-     * @return array     Hash array
+     * @deprecated
      */
-    function get_entry($dn)
+    public function set_cache($cache_engine)
     {
-        $rec = null;
-
-        if ($this->conn && $dn) {
-            $this->_debug("C: Read $dn [(objectclass=*)]");
-
-            if ($ldap_result = @ldap_read($this->conn, $dn, '(objectclass=*)', $this->attributes)) {
-                $this->_debug("S: OK");
-
-                if ($entry = ldap_first_entry($this->conn, $ldap_result)) {
-                    $rec = ldap_get_attributes($this->conn, $entry);
-                }
-            }
-            else {
-                $this->_debug("S: ".ldap_error($this->conn));
-            }
-
-            if (!empty($rec)) {
-                $rec['dn'] = $dn; // Add in the dn for the entry.
-            }
-        }
-
-        return $rec;
+        $this->config['cache'] = $cache_engine;
     }
 
     /**
-     * Execute the LDAP search based on the stored credentials
-     *
-     * @param string $base_dn  The base DN to query
-     * @param string $filter   The LDAP filter for search
-     * @param string $scope    The LDAP scope (list|sub|base)
-     * @param array  $attrs    List of entry attributes to read
-     * @param array  $prop     Hash array with query configuration properties:
-     *   - sort: array of sort attributes (has to be in sync with the VLV index)
-     *   - search: search string used for VLV controls
-     * @param boolean $count_only Set to true if only entry count is requested
-     *
-     * @return mixed  rcube_ldap_result object or number of entries (if count_only=true) or false on error
+     * @deprecated
      */
-    public function search($base_dn, $filter = '', $scope = 'sub', $attrs = array('dn'), $prop = array(), $count_only = false)
+    public static function scope2func($scope, &$ns_function = null)
     {
-        if (!$this->conn) {
-            return false;
-        }
-
-        if (empty($filter)) {
-            $filter = '(objectclass=*)';
-        }
-
-        $this->_debug("C: Search $base_dn for $filter");
-
-        $function = self::scope2func($scope, $ns_function);
-
-        // find available VLV index for this query
-        if (!$count_only && ($vlv_sort = $this->_find_vlv($base_dn, $filter, $scope, $prop['sort']))) {
-            // when using VLV, we get the total count by...
-            // ...either reading numSubOrdinates attribute
-            if (($sub_filter = $this->config['numsub_filter']) &&
-                ($result_count = @$ns_function($this->conn, $base_dn, $sub_filter, array('numSubOrdinates'), 0, 0, 0))
-            ) {
-                $counts = ldap_get_entries($this->conn, $result_count);
-                for ($vlv_count = $j = 0; $j < $counts['count']; $j++)
-                    $vlv_count += $counts[$j]['numsubordinates'][0];
-                $this->_debug("D: total numsubordinates = " . $vlv_count);
-            }
-            // ...or by fetching all records dn and count them
-            else if (!function_exists('ldap_parse_virtuallist_control')) {
-                $vlv_count = $this->search($base_dn, $filter, $scope, array('dn'), $prop, true);
-            }
-
-            $this->vlv_active = $this->_vlv_set_controls($vlv_sort, $this->list_page, $this->page_size, $prop['search']);
-        }
-        else {
-            $this->vlv_active = false;
-        }
-
-        // only fetch dn for count (should keep the payload low)
-        if ($ldap_result = @$function($this->conn, $base_dn, $filter,
-            $attrs, 0, (int)$this->config['sizelimit'], (int)$this->config['timelimit'])
-        ) {
-            // when running on a patched PHP we can use the extended functions
-            // to retrieve the total count from the LDAP search result
-            if ($this->vlv_active && function_exists('ldap_parse_virtuallist_control')) {
-                if (ldap_parse_result($this->conn, $ldap_result, $errcode, $matcheddn, $errmsg, $referrals, $serverctrls)) {
-                    ldap_parse_virtuallist_control($this->conn, $serverctrls, $last_offset, $vlv_count, $vresult);
-                    $this->_debug("S: VLV result: last_offset=$last_offset; content_count=$vlv_count");
-                }
-                else {
-                    $this->_debug("S: ".($errmsg ? $errmsg : ldap_error($this->conn)));
-                }
-            }
-            else if ($this->debug) {
-                $this->_debug("S: ".ldap_count_entries($this->conn, $ldap_result)." record(s) found");
-            }
-
-            $this->result = new rcube_ldap_result($this->conn, $ldap_result, $base_dn, $filter, $vlv_count);
-
-            return $count_only ? $this->result->count() : $this->result;
-        }
-        else {
-            $this->_debug("S: ".ldap_error($this->conn));
-        }
-
-        return false;
+        return self::scope_to_function($scope, $ns_function);
     }
 
     /**
-     * Modify an LDAP entry on the server
-     *
-     * @param string $dn      Entry DN
-     * @param array  $params  Hash array of entry attributes
-     * @param int    $mode    Update mode (UPDATE_MOD_ADD | UPDATE_MOD_DELETE | UPDATE_MOD_REPLACE)
+     * @deprecated
      */
-    public function modify($dn, $parms, $mode = 255)
+    public function set_config($opt, $val = null)
     {
-        // TODO: implement this
-
-        return false;
+        $this->config_set($opt, $val);
     }
 
     /**
-     * Wrapper for ldap_add()
-     *
-     * @see ldap_add()
+     * @deprecated
      */
     public function add($dn, $entry)
     {
-        $this->_debug("C: Add $dn: ".print_r($entry, true));
-
-        $res = ldap_add($this->conn, $dn, $entry);
-        if ($res === false) {
-            $this->_debug("S: ".ldap_error($this->conn));
-            return false;
-        }
-
-        $this->_debug("S: OK");
-        return true;
+        return $this->add_entry($dn, $entry);
     }
 
     /**
-     * Wrapper for ldap_delete()
-     *
-     * @see ldap_delete()
+     * @deprecated
      */
     public function delete($dn)
     {
-        $this->_debug("C: Delete $dn");
-
-        $res = ldap_delete($this->conn, $dn);
-        if ($res === false) {
-            $this->_debug("S: ".ldap_error($this->conn));
-            return false;
-        }
-
-        $this->_debug("S: OK");
-        return true;
+        return $this->delete_entry($dn);
     }
 
     /**
@@ -595,9 +255,6 @@ class rcube_ldap_generic
         $this->_debug("C: Read $dn [{$filter}]");
 
         if ($this->conn && $dn) {
-            if (!$attributes)
-                $attributes = $this->attributes;
-
             $result = @ldap_read($this->conn, $dn, $filter, $attributes, 0, (int)$this->config['sizelimit'], (int)$this->config['timelimit']);
             if ($result === false) {
                 $this->_debug("S: ".ldap_error($this->conn));
@@ -610,452 +267,7 @@ class rcube_ldap_generic
 
         return false;
     }
-
-    /**
-     * Choose the right PHP function according to scope property
-     *
-     * @param string $scope         The LDAP scope (sub|base|list)
-     * @param string $ns_function   Function to be used for numSubOrdinates queries
-     * @return string  PHP function to be used to query directory
-     */
-    public static function scope2func($scope, &$ns_function = null)
-    {
-        switch ($scope) {
-          case 'sub':
-            $function = $ns_function  = 'ldap_search';
-            break;
-          case 'base':
-            $function = $ns_function = 'ldap_read';
-            break;
-          default:
-            $function = 'ldap_list';
-            $ns_function = 'ldap_read';
-            break;
-        }
-
-        return $function;
-    }
-
-    /**
-     * Convert the given scope integer value to a string representation
-     */
-    public static function scopeint2str($scope)
-    {
-        switch ($scope) {
-            case 2:  return 'sub';
-            case 1:  return 'one';
-            case 0:  return 'base';
-            default: $this->_debug("Scope $scope is not a valid scope integer");
-        }
-
-        return '';
-    }
-
-    /**
-     * Escapes the given value according to RFC 2254 so that it can be safely used in LDAP filters.
-     *
-     * @param string $val Value to quote
-     * @return string The escaped value
-     */
-    public static function escape_value($val)
-    {
-        return strtr($str, array('*'=>'\2a', '('=>'\28', ')'=>'\29',
-            '\\'=>'\5c', '/'=>'\2f'));
-    }
-
-    /**
-     * Escapes a DN value according to RFC 2253
-     *
-     * @param string $dn DN value o quote
-     * @return string The escaped value
-     */
-    public static function escape_dn($dn)
-    {
-        return strtr($str, array(','=>'\2c', '='=>'\3d', '+'=>'\2b',
-            '<'=>'\3c', '>'=>'\3e', ';'=>'\3b', '\\'=>'\5c',
-            '"'=>'\22', '#'=>'\23'));
-    }
-
-    /**
-     * Normalize a LDAP result by converting entry attributes arrays into single values
-     *
-     * @param array $result LDAP result set fetched with ldap_get_entries()
-     * @return array        Hash array with normalized entries, indexed by their DNs
-     */
-    public static function normalize_result($result)
-    {
-        if (!is_array($result)) {
-            return array();
-        }
-
-        $entries  = array();
-        for ($i = 0; $i < $result['count']; $i++) {
-            $key = $result[$i]['dn'] ? $result[$i]['dn'] : $i;
-            $entries[$key] = self::normalize_entry($result[$i]);
-        }
-
-        return $entries;
-    }
-
-    /**
-     * Turn an LDAP entry into a regular PHP array with attributes as keys.
-     *
-     * @param array $entry Attributes array as retrieved from ldap_get_attributes() or ldap_get_entries()
-     *
-     * @return array       Hash array with attributes as keys
-     */
-    public static function normalize_entry($entry)
-    {
-        if (!isset($entry['count'])) {
-            return $entry;
-        }
-
-        $rec = array();
-
-        for ($i=0; $i < $entry['count']; $i++) {
-            $attr = $entry[$i];
-            if ($entry[$attr]['count'] == 1) {
-                switch ($attr) {
-                    case 'objectclass':
-                        $rec[$attr] = array(strtolower($entry[$attr][0]));
-                        break;
-                    default:
-                        $rec[$attr] = $entry[$attr][0];
-                        break;
-                }
-            }
-            else {
-                for ($j=0; $j < $entry[$attr]['count']; $j++) {
-                    $rec[$attr][$j] = $entry[$attr][$j];
-                }
-            }
-        }
-
-        return $rec;
-    }
-
-    /**
-     * Set server controls for Virtual List View (paginated listing)
-     */
-    private function _vlv_set_controls($sort, $list_page, $page_size, $search = null)
-    {
-        $sort_ctrl = array('oid' => "1.2.840.113556.1.4.473",  'value' => self::_sort_ber_encode((array)$sort));
-        $vlv_ctrl  = array('oid' => "2.16.840.1.113730.3.4.9", 'value' => self::_vlv_ber_encode(($offset = ($list_page-1) * $page_size + 1), $page_size, $search), 'iscritical' => true);
-
-        $this->_debug("C: Set controls sort=" . join(' ', unpack('H'.(strlen($sort_ctrl['value'])*2), $sort_ctrl['value'])) . " ($sort[0]);"
-            . " vlv=" . join(' ', (unpack('H'.(strlen($vlv_ctrl['value'])*2), $vlv_ctrl['value']))) . " ($offset/$page_size; $search)");
-
-        if (!ldap_set_option($this->conn, LDAP_OPT_SERVER_CONTROLS, array($sort_ctrl, $vlv_ctrl))) {
-            $this->_debug("S: ".ldap_error($this->conn));
-            $this->set_error(self::ERROR_SEARCH, 'vlvnotsupported');
-            return false;
-        }
-
-        return true;
-    }
-
-    /**
-     * Returns unified attribute name (resolving aliases)
-     */
-    private static function _attr_name($namev)
-    {
-        // list of known attribute aliases
-        static $aliases = array(
-            'gn' => 'givenname',
-            'rfc822mailbox' => 'email',
-            'userid' => 'uid',
-            'emailaddress' => 'email',
-            'pkcs9email' => 'email',
-        );
-
-        list($name, $limit) = explode(':', $namev, 2);
-        $suffix = $limit ? ':'.$limit : '';
-
-        return (isset($aliases[$name]) ? $aliases[$name] : $name) . $suffix;
-    }
-
-    /**
-     * Quotes attribute value string
-     *
-     * @param string $str Attribute value
-     * @param bool   $dn  True if the attribute is a DN
-     *
-     * @return string Quoted string
-     */
-    public static function quote_string($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
-            $replace = array('*'=>'\2a', '('=>'\28', ')'=>'\29', '\\'=>'\5c',
-                '/'=>'\2f');
-
-        return strtr($str, $replace);
-    }
-
-    /**
-     * Prints debug info to the log
-     */
-    private function _debug($str)
-    {
-        if ($this->debug && class_exists('rcube')) {
-            rcube::write_log('ldap', $str);
-        }
-    }
-
-
-    /*****************  Virtual List View (VLV) related utility functions  **************** */
-
-    /**
-     * Return the search string value to be used in VLV controls
-     */
-    private function _vlv_search($sort, $search)
-    {
-        foreach ($search as $attr => $value) {
-            if (!in_array(strtolower($attr), $sort)) {
-                $this->_debug("d: Cannot use VLV search using attribute not indexed: $attr (not in " . var_export($sort, true) . ")");
-                return null;
-            } else {
-                return $value;
-            }
-        }
-    }
-
-    /**
-     * Find a VLV index matching the given query attributes
-     *
-     * @return string Sort attribute or False if no match
-     */
-    private function _find_vlv($base_dn, $filter, $scope, $sort_attrs = null)
-    {
-        if (!$this->config['vlv'] || $scope == 'base') {
-            return false;
-        }
-
-        // get vlv config
-        $vlv_config = $this->_read_vlv_config();
-
-        if ($vlv = $vlv_config[$base_dn]) {
-            $this->_debug("D: Found a VLV for $base_dn");
-
-            if ($vlv['filter'] == strtolower($filter) || stripos($filter, '(&'.$vlv['filter'].'(') === 0) {
-                $this->_debug("D: Filter matches");
-                if ($vlv['scope'] == $scope) {
-                    // Not passing any sort attributes means you don't care
-                    if (empty($sort_attrs) || in_array($sort_attrs, $vlv['sort'])) {
-                        return $vlv['sort'][0];
-                    }
-                }
-                else {
-                    $this->_debug("D: Scope does not match");
-                }
-            }
-            else {
-                $this->_debug("D: Filter does not match");
-            }
-        }
-        else {
-            $this->_debug("D: No VLV for $base_dn");
-        }
-
-        return false;
-    }
-
-    /**
-     * Return VLV indexes and searches including necessary configuration
-     * details.
-     */
-    private function _read_vlv_config()
-    {
-        if (empty($this->config['vlv']) || empty($this->config['config_root_dn'])) {
-            return array();
-        }
-        // return hard-coded VLV config
-        else if (is_array($this->config['vlv'])) {
-            return $this->config['vlv'];
-        }
-
-        // return cached result
-        if (is_array($this->vlv_config)) {
-            return $this->vlv_config;
-        }
-
-        if ($this->cache && ($cached_config = $this->cache->get('vlvconfig'))) {
-            $this->vlv_config = $cached_config;
-            return $this->vlv_config;
-        }
-
-        $this->vlv_config = array();
-        $config_root_dn = $this->config['config_root_dn'];
-
-        $ldap_result = ldap_search($this->conn, $config_root_dn, '(objectclass=vlvsearch)', array('*'), 0, 0, 0);
-        $vlv_searches = new rcube_ldap_result($this->conn, $ldap_result, $config_root_dn, '(objectclass=vlvsearch)');
-
-        if ($vlv_searches->count() < 1) {
-            $this->_debug("D: Empty result from search for '(objectclass=vlvsearch)' on '$config_root_dn'");
-            return array();
-        }
-
-        foreach ($vlv_searches->entries(true) as $vlv_search_dn => $vlv_search_attrs) {
-            // Multiple indexes may exist
-            $ldap_result = ldap_search($this->conn, $vlv_search_dn, '(objectclass=vlvindex)', array('*'), 0, 0, 0);
-            $vlv_indexes = new rcube_ldap_result($this->conn, $ldap_result, $vlv_search_dn, '(objectclass=vlvindex)');
-
-            // Reset this one for each VLV search.
-            $_vlv_sort = array();
-            foreach ($vlv_indexes->entries(true) as $vlv_index_dn => $vlv_index_attrs) {
-                $_vlv_sort[] = explode(' ', $vlv_index_attrs['vlvsort']);
-            }
-
-            $this->vlv_config[$vlv_search_attrs['vlvbase']] = array(
-                'scope'  => self::scopeint2str($vlv_search_attrs['vlvscope']),
-                'filter' => strtolower($vlv_search_attrs['vlvfilter']),
-                'sort'   => $_vlv_sort,
-            );
-        }
-
-        // cache this
-        if ($this->cache)
-            $this->cache->set('vlvconfig', $this->vlv_config);
-
-        $this->_debug("D: Refreshed VLV config: " . var_export($this->vlv_config, true));
-
-        return $this->vlv_config;
-    }
-
-    /**
-     * Generate BER encoded string for Virtual List View option
-     *
-     * @param integer List offset (first record)
-     * @param integer Records per page
-     *
-     * @return string BER encoded option value
-     */
-    private static function _vlv_ber_encode($offset, $rpp, $search = '')
-    {
-        /*
-            this string is ber-encoded, php will prefix this value with:
-            04 (octet string) and 10 (length of 16 bytes)
-            the code behind this string is broken down as follows:
-            30 = ber sequence with a length of 0e (14) bytes following
-            02 = type integer (in two's complement form) with 2 bytes following (beforeCount): 01 00 (ie 0)
-            02 = type integer (in two's complement form) with 2 bytes following (afterCount):  01 18 (ie 25-1=24)
-            a0 = type context-specific/constructed with a length of 06 (6) bytes following
-            02 = type integer with 2 bytes following (offset): 01 01 (ie 1)
-            02 = type integer with 2 bytes following (contentCount):  01 00
-
-            with a search string present:
-            81 = type context-specific/constructed with a length of 04 (4) bytes following (the length will change here)
-            81 indicates a user string is present where as a a0 indicates just a offset search
-            81 = type context-specific/constructed with a length of 06 (6) bytes following
-
-            The following info was taken from the ISO/IEC 8825-1:2003 x.690 standard re: the
-            encoding of integer values (note: these values are in
-            two-complement form so since offset will never be negative bit 8 of the
-            leftmost octet should never by set to 1):
-            8.3.2: If the contents octets of an integer value encoding consist
-            of more than one octet, then the bits of the first octet (rightmost)
-            and bit 8 of the second (to the left of first octet) octet:
-                a) shall not all be ones; and
-                b) shall not all be zero
-        */
-
-        if ($search) {
-            $search = preg_replace('/[^-[:alpha:] ,.()0-9]+/', '', $search);
-            $ber_val = self::_string2hex($search);
-            $str = self::_ber_addseq($ber_val, '81');
-        }
-        else {
-            // 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
-        $str = "020100" . self::_ber_addseq(self::_ber_encode_int($rpp-1), '02') . $str;
-
-        // now tack on sequence identifier and length
-        $str = self::_ber_addseq($str, '30');
-
-        return pack('H'.strlen($str), $str);
-    }
-
-    /**
-     * create ber encoding for sort control
-     *
-     * @param array List of cols to sort by
-     * @return string BER encoded option value
-     */
-    private static function _sort_ber_encode($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;
-    }
-
 }
+
+// for backward compat.
+class rcube_ldap_result extends Net_LDAP3_Result {}