Description:
------------
I've found that searching the RootDSE does not work with  
PHP, because the base is set to NULL when no base is  
specified. This fact causes the LDAP library to look into 
the systems ldap.conf to take the base from there - which 
is probably not what we want. 
 
The following patch fixes the problem: 
  
--- php5-5.0.4/ext/ldap/ldap.c  2005-01-19  
01:27:42.000000000 +0100  
+++ php5-5.0.4/ext/ldap/ldap.c.fixed    2005-07-01  
17:15:55.000000000 +0200  
@@ -575,6 +575,7 @@  
 {  
        zval **link, **base_dn, **filter, **attrs, **attr,  
**attrsonly, **sizelimit, **timelimit, **deref;  
        char *ldap_base_dn = NULL;  
+    char *dummy_base_dn = "";  
        char *ldap_filter = NULL;  
        char **ldap_attrs = NULL;  
        ldap_linkdata *ld;  
@@ -674,7 +675,7 @@  
                } else {  
                        nbases = 0; /* this means string,  
not array */  
                        convert_to_string_ex(base_dn);  
-                       ldap_base_dn =  
Z_STRLEN_PP(base_dn) < 1 ? NULL : Z_STRVAL_PP(base_dn);  
+                       ldap_base_dn =  
Z_STRLEN_PP(base_dn) < 1 ? dummy_base_dn :  
Z_STRVAL_PP(base_dn);  
                }  
  
                if (Z_TYPE_PP(filter) == IS_ARRAY) {  
@@ -713,7 +714,7 @@  
                                 
zend_hash_get_current_data(Z_ARRVAL_PP(base_dn), (void  
**)&entry);  
                                 
zend_hash_move_forward(Z_ARRVAL_PP(base_dn));  
                                 
convert_to_string_ex(entry);  
-                               ldap_base_dn =  
Z_STRLEN_PP(entry) < 1 ? NULL : Z_STRVAL_PP(entry);  
+                               ldap_base_dn =  
Z_STRLEN_PP(entry) < 1 ? dummy_base_dn :  
Z_STRVAL_PP(entry);  
                        }  
                        if (nfilters != 0) { /* filter an  
array? */  
                                 
zend_hash_get_current_data(Z_ARRVAL_PP(filter), (void  
**)&entry);  
@@ -756,7 +757,7 @@  
  
        /* fix to make null base_dn's work */  
        if (strlen(ldap_base_dn) < 1) {  
-               ldap_base_dn = NULL;  
+               ldap_base_dn = dummy_base_dn;  
        }  
  
        ld = (ldap_linkdata *) zend_fetch_resource(link  
TSRMLS_CC, -1, "ldap link", NULL, 1, le_link);  

Reproduce code:
---------------
<?php

#  ldapsearch -x -b '' -s base '(objectclass=*)' namingContexts
function get_naming_contexts($server, $admin, $password)
{
  /* Build LDAP connection */
  $ds= ldap_connect ($server);
  if (!$ds) {
    die ("Can't bind to LDAP. No check possible!");
  }
  ldap_set_option($ds, LDAP_OPT_PROTOCOL_VERSION, 3);
  $r= ldap_bind ($ds, $admin, $password);

  /* Get base to look for naming contexts */
  $sr  = @ldap_read ($ds, "", "objectClass=*", array("namingContexts"));
  $attr= @ldap_get_entries($ds,$sr);
  print_r($attr);
}

get_naming_contexts("what.server.ever.org", "cn=admindn,dc=whatever,dc=org", "secret");

?>


Expected result:
----------------
Array 
( 
    [count] => 1 
    [0] => Array 
        ( 
            [namingcontexts] => Array 
                ( 
                    [count] => 2 
                    [0] => dc=whatever,dc=org 
                    [1] => dc=whatever,dc=shell 
                ) 
 
            [0] => namingcontexts 
            [count] => 1 
            [dn] => 
        ) 
 
) 

Actual result:
--------------
Array 
( 
    [count] => 1 
    [0] => Array 
        ( 
            [count] => 0 
            [dn] => dc=whatever,dc=org 
        ) 
 
)