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ldap_get_values returns NULL when attribute got more then 1000 values.


        I am using 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 a 1000 groups, it also sends an header to inform the client of this, the header looks like this : 


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 attribue as "memberOf"). 

It looks like the OpenLDAP API code is not ready to handle this header, The code looks for a length value and gets a length of 0 bytes, this cause the function to return NULL. 

My question is if this is a bug in the OpenLDAP API code or a miss behavior by the Active Directory server ? any help / ideas on the subject would be greate.