Re: How the backend knows it's being searched by syncprov?

[Howard Chu <hyc@symas.com>]

Pierangelo Masarati wrote:

> hyc@OpenLDAP.org wrote:
>
> > Update of /repo/OpenLDAP/pkg/ldap/servers/slapd/overlays
> >
> > Modified Files:
> >     syncprov.c  1.24 -> 1.25
> >  
> Howard,
>
> to use syncprov on top of back-sql, I need the backend to know it's 
> being searched for sync replication purposes when filtering for CSN.  
> To this end, I added a function slap_find_control_id() that returns 
> the cid for a given control oid; then, to determine if a search is 
> performed for syncrepl purposes, I'd use
>
>        slap_find_control_id( LDAP_CONTROL_SYNC, &sync_cid );
>
> to grab the control's cid at initialization and, when requested to 
> filter for CSN, I'd test (op->o_controls[sync_cid]).
> sync_cid could be a back-sql wide static variable, initialized to -1 
> and grabbed, for instance, at bi_open(); or it could
> even be global scoped, in case other backends need to be syncrepl-aware.
>
> Do you think this is correct?
>
> Ciao, Ando.

Yes, thanks. I meant to add a function like this already but forgot. If 
we really need global knowledge of this control we can put the #define's 
and such back into slap.h and controls.c.
   #define o_sync_mode ...
   slap_cids.sc_LDAPsync

would probably be the most useful.

--
 -- Howard Chu
 Chief Architect, Symas Corp.       Director, Highland Sun
 http://www.symas.com               http://highlandsun.com/hyc
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