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(ITS#6624) cn=config support for back_null

Full_Name: Ondrej Kuznik
Version: HEAD
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (

Back-null database currently does not support cn=config. Although there 
is only one directive (bind allowed), it could be useful to support it 
once openldap no longer uses slapd.conf. The following patches represent 
two alternatives that attempt to add this capability, adding a new 
attribute type (OLcfgDbAt:8.1 'olcDbBindAllowed') and one objectclass 
(OLcfgDbOc:8.1 'olcNullConfig') to the schemas. They are two as I am new 
to slapd internals and do not know which approach is more preferable.

The first patch adds the functionality using only bconfig.c 
config_{check,set}_vals (through flags ARG_ON_OFF|ARG_OFFSET) but a 
modify that deletes the attribute leaves the value of ni_bind_allowed 

The second one uses a callback function like any other backend so it 
does not suffer from this issue.

This patch file is derived from OpenLDAP Software. All of the 
modifications to OpenLDAP Software represented in the following 
patch(es) were developed by Acision. Acision has not assigned rights 
and/or interest in this work to any party. I, Ondřej Kuzník am 
authorized by Acision, my employer, to release this work under the 
following terms.

The attached modifications to OpenLDAP Software are subject to the following
Copyright 2010 Acision
Redistribution and use in source and binary forms, with or without modification,
are permitted only as authorized by the OpenLDAP Public License.