ldap_get_values returns NULL when attribute got more then 1000 values.

[hagai yaffe]

Hello.

I have wrote a program that uses the OpenLDAP API
version 2.1.22 to get data from windows Active Directory,
I am using the "memberOf" attribute to get all the groups
a user is assigned to in the Active Directory, for a user
who has less then a 1000 groups I have no problem, but for
a user who is member off more then 1000 groups the
ldap_get_values function returns NULL.

After a little snooping around I have discovered that for
a user who is member off more then a 1000 groups the
Active Directory server sends only 1000 groups, it also
sends an header to inform the client of this, the header
looks like this :

..memberOf1.....0.......memberOf;range=0-999

after this header a 1000 group names are sent, for less
then a 1000 groups this header does not appear (only a
header that identify the attribute as "memberOf").

I think that this is caused because that the Active
Directory server treats my request as a paged search
request, so I am getting a paged search control in the
response (this is the header "memberOf;range=0-999"). I
don't know why the server is treating a normal request as
a paged search request, this is not compliant with the
LDAP rfc, is there a way to prevent this ? or maybe to
increase the paged search size ? (default is 1000).

Any help / ideas on the subject would be greate.

TX.

Hagai.

 

[Tom Ausburne]

Depending on how you are doing this it may be a bug that we are aware
of. Here is one article that may be of help:

814925 Visual Basic Procedure to Count the Members of a Group Returns
a Value
http://support.microsoft.com/?id=814925


Tom Ausburne (MSFT)
Windows 2000 Directory Services
This posting is provided "AS IS" with no warranties, and confers no
rights.

 

[Stefan Buchman]

I've run into this in my own LDAP programs. The only solution I found
was to determine if there were more than 1000 values in the attribute
(MemberOf) to then do a paged query.

- Stefan

 

[Jason Robarts [MSFT]]

http://msdn.microsoft.com/library/d...ldap/ldap/searching_using_range_retrieval.asp

will explain the range option used to obtain more than 1000 attribute values
from Active Directory. It is different from a paged search which will
return multiple objects vs multiple attributes.

Jason