Recent back-sql improvements toward 2.3

[Pierangelo Masarati <ando@sys-net.it>]

I've been working a bit on back-sql; there were some bugs, some 
misimplemented or missing features, and there have been some significant 
contributions that required some work to be merged.  I want to summarize 
them, in a totally unsorted fashion.

1) I've added the capability to work as a syncrepl provider, in a very 
rough implementaton of the refreshOnly mode.
2) Now referrals are handled/returned consistently, i.e. one needs 
manageDSAit to update them, and matchedDN and referrals are always 
returned as appropriate (ITS#3489).
3) ACLs are always checked as appropriate; some checks were missing 
(ITS#3485).
4) I've added the possibility to add extra attributes in sladp.conf to 
searches, including those performed internally for other purposes, so 
that access checking based on target and user contents can occur 
consistently (ITS#3480).
5) I've added support for the "assert" control.
6) I've imported most of the improvements provided by Mark Adamson 
(ITS#3432); the remaining are under evaluation.
7) I've implemented the "disclose" access feature as requested in 
ITS#3472 and subsequent -devel discussion for all operations (requires 
#define SLAP_ACL_HONOR_DISCLOSE)
8) Now attribute values retrieved from the RDBMS are 
validated/prettified and normalized consistently.
9) the "noop" control is implemented as well; it's not enabled right now 
because I'm seeing some odd issues I haven't been able to track yet, but 
they might (they should) be related to the RDBMS I'm currently working with.

Other small bugs have been fixed in the meanwhile (e.g. ITS#3488), and 
various optimizations and other improvements have been applied; the man 
page has been reorganized, all config options are now present.  I assume 
the current HEAD code will make it into 2.3, hopefully with the rest of 
ITS#3432 improvements.  Of course I'd appreciate any feedback and 
testing.  The might be backwards compatibility issues I'm overlooking.

p.




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