- Apply fixes fom trunk up to r5414

alecpl

2011-11-11 ecfaed571b2c38f4bcc2b6a0fa39fba15a5126ce

 program/include/rcube_ldap.php

@@ -86,6 +86,8 @@
            // set default name attribute to cn
            if (empty($this->prop['groups']['name_attr']))
                $this->prop['groups']['name_attr'] = 'cn';
            if (empty($this->prop['groups']['scope']))
                $this->prop['groups']['scope'] = 'sub';
        }

        // fieldmap property is given
@@ -163,12 +165,14 @@

        foreach ($this->prop['hosts'] as $host)
        {
            $host = idn_to_ascii(rcube_parse_host($host));
            $this->_debug("C: Connect [$host".($this->prop['port'] ? ':'.$this->prop['port'] : '')."]");
            $host     = idn_to_ascii(rcube_parse_host($host));
            $hostname = $host.($this->prop['port'] ? ':'.$this->prop['port'] : '');

            $this->_debug("C: Connect [$hostname]");

            if ($lc = @ldap_connect($host, $this->prop['port']))
            {
                if ($this->prop['use_tls']===true)
                if ($this->prop['use_tls'] === true)
                    if (!ldap_start_tls($lc))
                        continue;

@@ -177,90 +181,113 @@
                ldap_set_option($lc, LDAP_OPT_PROTOCOL_VERSION, $this->prop['ldap_version']);
                $this->prop['host'] = $host;
                $this->conn = $lc;

                if (isset($this->prop['referrals']))
                    ldap_set_option($lc, LDAP_OPT_REFERRALS, $this->prop['referrals']);
                break;
            }
            $this->_debug("S: NOT OK");
        }

        if (is_resource($this->conn))
        {
            $this->ready = true;

            $bind_pass = $this->prop['bind_pass'];
            $bind_user = $this->prop['bind_user'];
            $bind_dn   = $this->prop['bind_dn'];

            $this->base_dn        = $this->prop['base_dn'];
            $this->groups_base_dn = ($this->prop['groups']['base_dn']) ?
                $this->prop['groups']['base_dn'] : $this->base_dn;

            // User specific access, generate the proper values to use.
            if ($this->prop['user_specific']) {
                // No password set, use the session password
                if (empty($bind_pass)) {
                    $bind_pass = $RCMAIL->decrypt($_SESSION['password']);
                }

                // Get the pieces needed for variable replacement.
                if ($fu = $RCMAIL->user->get_username())
                  list($u, $d) = explode('@', $fu);
                else
                  $d = $this->mail_domain;

                $dc = 'dc='.strtr($d, array('.' => ',dc=')); // hierarchal domain string

                $replaces = array('%dc' => $dc, '%d' => $d, '%fu' => $fu, '%u' => $u);

                if ($this->prop['search_base_dn'] && $this->prop['search_filter']) {
                    // Search for the dn to use to authenticate
                    $this->prop['search_base_dn'] = strtr($this->prop['search_base_dn'], $replaces);
                    $this->prop['search_filter'] = strtr($this->prop['search_filter'], $replaces);

                    $this->_debug("S: searching with base {$this->prop['search_base_dn']} for {$this->prop['search_filter']}");

                    $res = @ldap_search($this->conn, $this->prop['search_base_dn'], $this->prop['search_filter'], array('uid'));
                    if ($res && ($entry = ldap_first_entry($this->conn, $res))) {
                        $bind_dn = ldap_get_dn($this->conn, $entry);

                        $this->_debug("S: search returned dn: $bind_dn");

                        if ($bind_dn) {
                            $dn = ldap_explode_dn($bind_dn, 1);
                            $replaces['%dn'] = $dn[0];
                        }
                    }
                }
                // Replace the bind_dn and base_dn variables.
                $bind_dn              = strtr($bind_dn, $replaces);
                $this->base_dn        = strtr($this->base_dn, $replaces);
                $this->groups_base_dn = strtr($this->groups_base_dn, $replaces);

                if (empty($bind_user)) {
                    $bind_user = $u;
                }
            }

            if (!empty($bind_pass)) {
                if (!empty($bind_dn)) {
                    $this->ready = $this->bind($bind_dn, $bind_pass);
                }
                else if (!empty($this->prop['auth_cid'])) {
                    $this->ready = $this->sasl_bind($this->prop['auth_cid'], $bind_pass, $bind_user);
                }
                else {
                    $this->ready = $this->sasl_bind($bind_user, $bind_pass);
                }
            }
        }
        else
            raise_error(array('code' => 100, 'type' => 'ldap',
                'file' => __FILE__, 'line' => __LINE__,
                'message' => "Could not connect to any LDAP server, last tried $host:{$this->prop[port]}"), true);

        // See if the directory is writeable.
        if ($this->prop['writable']) {
            $this->readonly = false;
        } // end if
        }

        if (!is_resource($this->conn)) {
            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;
        }

        $bind_pass = $this->prop['bind_pass'];
        $bind_user = $this->prop['bind_user'];
        $bind_dn   = $this->prop['bind_dn'];

        $this->base_dn        = $this->prop['base_dn'];
        $this->groups_base_dn = ($this->prop['groups']['base_dn']) ?
        $this->prop['groups']['base_dn'] : $this->base_dn;

        // User specific access, generate the proper values to use.
        if ($this->prop['user_specific']) {
            // No password set, use the session password
            if (empty($bind_pass)) {
                $bind_pass = $RCMAIL->decrypt($_SESSION['password']);
            }

            // Get the pieces needed for variable replacement.
            if ($fu = $RCMAIL->user->get_username())
                list($u, $d) = explode('@', $fu);
            else
                $d = $this->mail_domain;

            $dc = 'dc='.strtr($d, array('.' => ',dc=')); // hierarchal domain string

            $replaces = array('%dn' => '', '%dc' => $dc, '%d' => $d, '%fu' => $fu, '%u' => $u);

            if ($this->prop['search_base_dn'] && $this->prop['search_filter']) {
                // Search for the dn to use to authenticate
                $this->prop['search_base_dn'] = strtr($this->prop['search_base_dn'], $replaces);
                $this->prop['search_filter'] = strtr($this->prop['search_filter'], $replaces);

                $this->_debug("S: searching with base {$this->prop['search_base_dn']} for {$this->prop['search_filter']}");

                $res = @ldap_search($this->conn, $this->prop['search_base_dn'], $this->prop['search_filter'], array('uid'));
                if ($res) {
                    if (($entry = ldap_first_entry($this->conn, $res))
                        && ($bind_dn = ldap_get_dn($this->conn, $entry))
                    ) {
                        $this->_debug("S: search returned dn: $bind_dn");
                        $dn = ldap_explode_dn($bind_dn, 1);
                        $replaces['%dn'] = $dn[0];
                    }
                }
                else {
                    $this->_debug("S: ".ldap_error($this->conn));
                }

                // DN not found
                if (empty($replaces['%dn'])) {
                    if (!empty($this->prop['search_dn_default']))
                        $replaces['%dn'] = $this->prop['search_dn_default'];
                    else {
                        raise_error(array(
                            'code' => 100, 'type' => 'ldap',
                            'file' => __FILE__, 'line' => __LINE__,
                            'message' => "DN not found using LDAP search."), true);
                        return false;
                    }
                }
            }

            // Replace the bind_dn and base_dn variables.
            $bind_dn              = strtr($bind_dn, $replaces);
            $this->base_dn        = strtr($this->base_dn, $replaces);
            $this->groups_base_dn = strtr($this->groups_base_dn, $replaces);

            if (empty($bind_user)) {
                $bind_user = $u;
            }
        }

        if (empty($bind_pass)) {
            $this->ready = true;
        }
        else {
            if (!empty($bind_dn)) {
                $this->ready = $this->bind($bind_dn, $bind_pass);
            }
            else if (!empty($this->prop['auth_cid'])) {
                $this->ready = $this->sasl_bind($this->prop['auth_cid'], $bind_pass, $bind_user);
            }
            else {
                $this->ready = $this->sasl_bind($bind_user, $bind_pass);
            }
        }

        return $this->ready;
    }


@@ -505,10 +532,10 @@
    * Get all members of the given group
    *
    * @param string Group DN
    * @param array  Group entry (if called recursively)
    * @param array  Group entries (if called recursively)
    * @return array Accumulated group members
     */
    function list_group_members($dn, $entries = null)
    function list_group_members($dn, $count = false, $entries = null)
    {
        $group_members = array();

@@ -531,22 +558,25 @@
            if (empty($entry['objectclass']))
                continue;

            foreach ((array)$entry['objectclass'] as $num => $objectclass)
            foreach ((array)$entry['objectclass'] as $objectclass)
            {
                switch (strtolower($objectclass)) {
                    case "groupofnames":
                    case "kolabgroupofnames":
                        $group_members = array_merge($group_members, $this->_list_group_members($dn, $entry, 'member'));
                        $group_members = array_merge($group_members, $this->_list_group_members($dn, $entry, 'member', $count));
                        break;
                    case "groupofuniquenames":
                    case "kolabgroupofuniquenames":
                        $group_members = array_merge($group_members, $this->_list_group_members($dn, $entry, 'uniquemember'));
                        $group_members = array_merge($group_members, $this->_list_group_members($dn, $entry, 'uniquemember', $count));
                        break;
                    case "groupofurls":
                        $group_members = array_merge($group_members, $this->_list_group_memberurl($dn, $entry));
                        $group_members = array_merge($group_members, $this->_list_group_memberurl($dn, $entry, $count));
                        break;
                }
            }
            
            if ($this->prop['sizelimit'] && count($group_members) > $this->prop['sizelimit'])
              break;
        }

        return array_filter($group_members);
@@ -560,7 +590,7 @@
     * @param string Member attribute to use
     * @return array Accumulated group members
     */
    private function _list_group_members($dn, $entry, $attr)
    private function _list_group_members($dn, $entry, $attr, $count)
    {
        // Use the member attributes to return an array of member ldap objects
        // NOTE that the member attribute is supposed to contain a DN
@@ -568,10 +598,17 @@
        if (empty($entry[$attr]))
            return $group_members;

        // read these attributes for all members
        $attrib = $count ? array('dn') : array_values($this->fieldmap);
        $attrib[] = 'objectClass';
        $attrib[] = 'member';
        $attrib[] = 'uniqueMember';
        $attrib[] = 'memberURL';

        for ($i=0; $i < $entry[$attr]['count']; $i++)
        {
            $result = @ldap_read($this->conn, $entry[$attr][$i], '(objectclass=*)',
                array_values($this->fieldmap), 0, (int)$this->prop['sizelimit'], (int)$this->prop['timelimit']);
                $attrib, 0, (int)$this->prop['sizelimit'], (int)$this->prop['timelimit']);

            $members = @ldap_get_entries($this->conn, $result);
            if ($members == false)
@@ -581,7 +618,7 @@
            }

            // for nested groups, call recursively
            $nested_group_members = $this->list_group_members($entry[$attr][$i], $members);
            $nested_group_members = $this->list_group_members($entry[$attr][$i], $count, $members);

            unset($members['count']);
            $group_members = array_merge($group_members, array_filter($members), $nested_group_members);
@@ -595,9 +632,10 @@
     *
     * @param string Group DN
     * @param array  Group entry
     * @param boolean True if only used for counting
     * @return array Accumulated group members
     */
    private function _list_group_memberurl($dn, $entry)
    private function _list_group_memberurl($dn, $entry, $count)
    {
        $group_members = array();

@@ -611,8 +649,9 @@
            $filter = $this->filter ? '(&(' . $m[3] . ')(' . $this->filter . '))' : $m[3];
            $func = $m[2] == 'sub' ? 'ldap_search' : ($m[2] == 'base' ? 'ldap_read' : 'ldap_list');

            $attrib = $count ? array('dn') : array_values($this->fieldmap);
            if ($result = @$func($this->conn, $m[1], $filter,
                array_values($this->fieldmap), 0, (int)$this->prop['sizelimit'], (int)$this->prop['timelimit']))
                $attrib, 0, (int)$this->prop['sizelimit'], (int)$this->prop['timelimit']))
            {
                $this->_debug("S: ".ldap_count_entries($this->conn, $result)." record(s) for ".$m[1]);
                if ($err = ldap_errno($this->conn))
@@ -627,7 +666,7 @@
            $entries = @ldap_get_entries($this->conn, $result);
            for ($j = 0; $j < $entries['count']; $j++)
            {
                if ($nested_group_members = $this->list_group_members($entries[$j]['dn']))
                if ($nested_group_members = $this->list_group_members($entries[$j]['dn'], $count))
                    $group_members = array_merge($group_members, $nested_group_members);
                else
                    $group_members[] = $entries[$j];
@@ -651,15 +690,20 @@
     *
     * @param mixed   $fields   The field name of array of field names to search in
     * @param mixed   $value    Search value (or array of values when $fields is array)
     * @param boolean $strict   True for strict, False for partial (fuzzy) matching
     * @param int     $mode     Matching mode:
     *                          0 - partial (*abc*),
     *                          1 - strict (=),
     *                          2 - prefix (abc*)
     * @param boolean $select   True if results are requested, False if count only
     * @param boolean $nocount  (Not used)
     * @param array   $required List of fields that cannot be empty
     *
     * @return array  Indexed list of contact records and 'count' value
     */
    function search($fields, $value, $strict=false, $select=true, $nocount=false, $required=array())
    function search($fields, $value, $mode=0, $select=true, $nocount=false, $required=array())
    {
        $mode = intval($mode);

        // special treatment for ID-based search
        if ($fields == 'ID' || $fields == $this->primary_key)
        {
@@ -676,9 +720,62 @@
            return $result;
        }

        // use VLV pseudo-search for autocompletion
        if ($this->prop['vlv_search'] && $this->conn && join(',', (array)$fields) == 'email,name')
        {
            // add general filter to query
            if (!empty($this->prop['filter']) && empty($this->filter))
                $this->set_search_set($this->prop['filter']);

            // set VLV controls with encoded search string
            $this->_vlv_set_controls($this->prop, $this->list_page, $this->page_size, $value);

            $function = $this->_scope2func($this->prop['scope']);
            $this->ldap_result = @$function($this->conn, $this->base_dn, $this->filter ? $this->filter : '(objectclass=*)',
                array_values($this->fieldmap), 0, (int)$this->prop['sizelimit'], (int)$this->prop['timelimit']);

            // get all entries of this page and post-filter those that really match the query
            $search = mb_strtolower($value);
            $this->result = new rcube_result_set(0);
            $entries = ldap_get_entries($this->conn, $this->ldap_result);

            for ($i = 0; $i < $entries['count']; $i++) {
                $rec = $this->_ldap2result($entries[$i]);
                foreach (array('email', 'name') as $f) {
                    $val = mb_strtolower($rec[$f]);
                    switch ($mode) {
                    case 1:
                        $got = ($val == $search);
                        break;
                    case 2:
                        $got = ($search == substr($val, 0, strlen($search)));
                        break;
                    default:
                        $got = (strpos($val, $search) !== false);
                        break;
                    }

                    if ($got) {
                        $this->result->add($rec);
                        $this->result->count++;
                        break;
                    }
                }
            }

            return $this->result;
        }

        // use AND operator for advanced searches
        $filter = is_array($value) ? '(&' : '(|';
        $wc     = !$strict && $this->prop['fuzzy_search'] ? '*' : '';
        // set wildcards
        $wp = $ws = '';
        if (!empty($this->prop['fuzzy_search']) && $mode != 1) {
            $ws = '*';
            if (!$mode) {
                $wp = '*';
            }
        }

        if ($fields == '*')
        {
@@ -692,7 +789,7 @@
            if (is_array($this->prop['search_fields']))
            {
                foreach ($this->prop['search_fields'] as $field) {
                    $filter .= "($field=$wc" . $this->_quote_string($value) . "$wc)";
                    $filter .= "($field=$wp" . $this->_quote_string($value) . "$ws)";
                }
            }
        }
@@ -701,7 +798,7 @@
            foreach ((array)$fields as $idx => $field) {
                $val = is_array($value) ? $value[$idx] : $value;
                if ($f = $this->_map_field($field)) {
                    $filter .= "($f=$wc" . $this->_quote_string($val) . "$wc)";
                    $filter .= "($f=$wp" . $this->_quote_string($val) . "$ws)";
                }
            }
        }
@@ -748,7 +845,7 @@
            $count = $this->vlv_active ? $this->vlv_count : ldap_count_entries($this->conn, $this->ldap_result);
        }
        else if ($this->group_id && $this->group_data['dn']) {
            $count = count($this->list_group_members($this->group_data['dn']));
            $count = count($this->list_group_members($this->group_data['dn'], true));
        }
        else if ($this->conn) {
            // We have a connection but no result set, attempt to get one.
@@ -1102,21 +1199,9 @@
        if ($this->ready)
        {
            $filter = $this->filter ? $this->filter : '(objectclass=*)';
            $function = $this->_scope2func($this->prop['scope'], $ns_function);

            switch ($this->prop['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;
            }

            $this->_debug("C: Search [$filter]");
            $this->_debug("C: Search [$filter][dn: $this->base_dn]");

            // when using VLV, we get the total count by...
            if (!$count && $function != 'ldap_read' && $this->prop['vlv'] && !$this->group_id) {
@@ -1130,7 +1215,7 @@
                else  // ...or by fetching all records dn and count them
                    $this->vlv_count = $this->_exec_search(true);

                $this->vlv_active = $this->_vlv_set_controls();
                $this->vlv_active = $this->_vlv_set_controls($this->prop, $this->list_page, $this->page_size);
            }

            // only fetch dn for count (should keep the payload low)
@@ -1141,7 +1226,7 @@
                $this->_debug("S: ".ldap_count_entries($this->conn, $this->ldap_result)." record(s)");
                if ($err = ldap_errno($this->conn))
                    $this->_debug("S: Error: " .ldap_err2str($err));
                return true;
                return $count ? ldap_count_entries($this->conn, $this->ldap_result) : true;
            }
            else
            {
@@ -1153,15 +1238,37 @@
    }

    /**
     * Choose the right PHP function according to scope property
     */
    private 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;
    }

    /**
     * Set server controls for Virtual List View (paginated listing)
     */
    private function _vlv_set_controls()
    private function _vlv_set_controls($prop, $list_page, $page_size, $search = null)
    {
        $sort_ctrl = array('oid' => "1.2.840.113556.1.4.473",  'value' => $this->_sort_ber_encode((array)$this->prop['sort']));
        $vlv_ctrl  = array('oid' => "2.16.840.1.113730.3.4.9", 'value' => $this->_vlv_ber_encode(($offset = ($this->list_page-1) * $this->page_size + 1), $this->page_size), 'iscritical' => true);
        $sort_ctrl = array('oid' => "1.2.840.113556.1.4.473",  'value' => $this->_sort_ber_encode((array)$prop['sort']));
        $vlv_ctrl  = array('oid' => "2.16.840.1.113730.3.4.9", 'value' => $this->_vlv_ber_encode(($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), $sort_ctrl['value'])) . " ({$this->sort_col});"
            . " vlv=" . join(' ', (unpack('H'.(strlen($vlv_ctrl['value'])*2), $vlv_ctrl['value']))) . " ($offset)");
        $sort = (array)$prop['sort'];
        $this->_debug("C: set controls sort=" . join(' ', unpack('H'.(strlen($sort_ctrl['value'])*2), $sort_ctrl['value'])) . " ($sort[0]);"
            . " vlv=" . join(' ', (unpack('H'.(strlen($vlv_ctrl['value'])*2), $vlv_ctrl['value']))) . " ($offset/$page_size)");

        if (!ldap_set_option($this->conn, LDAP_OPT_SERVER_CONTROLS, array($sort_ctrl, $vlv_ctrl))) {
            $this->_debug("S: ".ldap_error($this->conn));
@@ -1265,6 +1372,18 @@


    /**
     * Activate/deactivate debug mode
     *
     * @param boolean $dbg True if LDAP commands should be logged
     * @access public
     */
    function set_debug($dbg = true)
    {
        $this->debug = $dbg;
    }


    /**
     * Quotes attribute value string
     *
     * @param string $str Attribute value
@@ -1328,9 +1447,9 @@

        $groups = array();
        if ($search) {
            $search = strtolower($search);
            $search = mb_strtolower($search);
            foreach ($group_cache as $group) {
                if (strstr(strtolower($group['name']), $search))
                if (strpos(mb_strtolower($group['name']), $search) !== false)
                    $groups[] = $group;
            }
        }
@@ -1343,16 +1462,27 @@
    /**
     * Fetch groups from server
     */
    private function _fetch_groups()
    private function _fetch_groups($vlv_page = 0)
    {
        $base_dn = $this->groups_base_dn;
        $filter = $this->prop['groups']['filter'];
        $name_attr = $this->prop['groups']['name_attr'];
        $email_attr = $this->prop['groups']['email_attr'] ? $this->prop['groups']['email_attr'] : 'mail';
        $sort_attrs = $this->prop['groups']['sort'] ? (array)$this->prop['groups']['sort'] : array($name_attr);
        $sort_attr = $sort_attrs[0];

        $this->_debug("C: Search [$filter][dn: $base_dn]");

        $res = @ldap_search($this->conn, $base_dn, $filter, array('dn', $name_attr, 'objectClass', $email_attr));
        // use vlv to list groups
        if ($this->prop['groups']['vlv']) {
            $page_size = 200;
            if (!$this->prop['groups']['sort'])
                $this->prop['groups']['sort'] = $sort_attrs;
            $vlv_active = $this->_vlv_set_controls($this->prop['groups'], $vlv_page+1, $page_size);
        }

        $function = $this->_scope2func($this->prop['groups']['scope'], $ns_function);
        $res = @$function($this->conn, $base_dn, $filter, array_unique(array('dn', 'objectClass', $name_attr, $email_attr, $sort_attr)));
        if ($res === false)
        {
            $this->_debug("S: ".ldap_error($this->conn));
@@ -1364,9 +1494,10 @@

        $groups = array();
        $group_sortnames = array();
        for ($i=0; $i<$ldap_data["count"]; $i++)
        $group_count = $ldap_data["count"];
        for ($i=0; $i < $group_count; $i++)
        {
            $group_name = $ldap_data[$i][$name_attr][0];
            $group_name = is_array($ldap_data[$i][$name_attr]) ? $ldap_data[$i][$name_attr][0] : $ldap_data[$i][$name_attr];
            $group_id = self::dn_encode($group_name);
            $groups[$group_id]['ID'] = $group_id;
            $groups[$group_id]['dn'] = $ldap_data[$i]['dn'];
@@ -1394,9 +1525,24 @@
                    $groups[$group_id]['email'][] = $ldap_data[$i][$email_attr][$j];
            }

            $group_sortnames[] = strtolower($group_name);
            $group_sortnames[] = mb_strtolower($ldap_data[$i][$sort_attr][0]);
        }
        array_multisort($group_sortnames, SORT_ASC, SORT_STRING, $groups);

        // recursive call can exit here
        if ($vlv_page > 0)
            return $groups;

        // call recursively until we have fetched all groups
        while ($vlv_active && $group_count == $page_size)
        {
            $next_page = $this->_fetch_groups(++$vlv_page);
            $groups = array_merge($groups, $next_page);
            $group_count = count($next_page);
        }

        // when using VLV the list of groups is already sorted
        if (!$this->prop['groups']['vlv'])
            array_multisort($group_sortnames, SORT_ASC, SORT_STRING, $groups);

        // cache this
        $this->cache->set('groups', $groups);
@@ -1646,17 +1792,23 @@
     * @param integer Records per page
     * @return string BER encoded option value
     */
    private function _vlv_ber_encode($offset, $rpp)
    private function _vlv_ber_encode($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
        # 20 = type integer (in two's complement form) with 2 bytes following (beforeCount): 01 00 (ie 0)
        # 20 = type integer (in two's complement form) with 2 bytes following (afterCount):  01 18 (ie 25-1=24)
        # 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
        # 20 = type integer with 2 bytes following (offset): 01 01 (ie 1)
        # 20 = type integer with 2 bytes following (contentCount):  01 00
        # 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
@@ -1666,20 +1818,29 @@
        # 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

        # construct the string from right to left
        $str = "020100"; # contentCount
            $ber_val = self::_ber_encode_int($offset);  // returns encoded integer value in hex format

        $ber_val = self::_ber_encode_int($offset);  // returns encoded integer value in hex format
            // calculate octet length of $ber_val
            $str = self::_ber_addseq($ber_val, '02') . $str;

        // 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 compute length over $str
            $str = self::_ber_addseq($str, 'a0');
        }
        
        // now tack on records per page
        $str = sprintf("0201000201%02x", min(255, $rpp)-1) . $str;
        $str = "020100" . self::_ber_addseq(self::_ber_encode_int($rpp-1), '02') . $str;

        // now tack on sequence identifier and length
        $str = self::_ber_addseq($str, '30');