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Re: ITS#5724 (Re: commit: ldap/servers/slapd backover.c)



Howard Chu wrote:
> ando@sys-net.it wrote:
>> ando@OpenLDAP.org wrote:
>>
>>> Log Message:
>>> open database using the real structure (partial fix to ITS#5724)
>>
>> We need a virtual database to inherit controls from the real database.
>> Sharing the array of known controls could be a solution, but it wouldn't
>> allow the virtual database to have specific controls, e.g. registered by
>> an overlay.  A solution would be to let the real database know it's
>> related to virtual ones, so that modifications to the real database via
>> back-config can be propagated to the virtual ones.  This, of course,
>> poses the problem that if a virtual database is deleted, any reference
>> to it must be removed from the list of related databases.  I wonder if
>> all of this is worth the effort of exposing real controls by the virtual
>> database.
> 
> Since a single relay database may be configured to multiplex to many 
> other databases, and they may not all support the same set of controls, 
> this seems to be an exercise in futility. I guess it may be OK to just 
> advertise a union of all the real database controls, and perform an 
> extra restriction check before handing off processing.

Sharing the pointer to the supported controls would allow to use the 
actual set.  Something along the line

struct BackendDB {
	char be_ctrlsbuf[SLAP_MAX_CIDS + 1];
         char *be_ctrls;
};

All backends would have be_ctrls = be_ctrlsbuf, but back-relay would set 
it to NULL, and temporarily set it to the relayed database's be_ctrlsbuf 
for the duration of an operation.  Modules wouldn't be able to register 
new controls because the pointer is null otherwise.

p.


Ing. Pierangelo Masarati
OpenLDAP Core Team

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