switch rpc_pipe_open_internal to use NDR marshalling

[Andrew Bartlett]

On Thu, 2010-07-08 at 14:26 +0200, Guenther Deschner wrote:
> Hi,
> 
> currently, the way we handle internal rpc pipes (in RAP to RPC, RPC to RPC
> and winbind to RPC scenarios) is highly effective (given the generated
> dispatch table) but rather problematic for two reasons:
> 
> * Various fields of the IDL structs (all [value(X) elements) are only set
>   during NDR push operations and thus remain unset in rpc_pipe_open_internal()
>   exchanges.
> 
> * Memory allocation (in particular in,out pointers)

This is the most important reason to do this.  I recently put in a
talloc_steal() of an 'in' variable in the samba4 RPC server, and while I
could fix that, there may be other cases already.  

> Therefor I'd like to push this patch
> http://git.samba.org/?p=gd/samba/.git;a=commitdiff;h=d351fc3da3c0a7a5b27435fbcae895eb246a8c0f
> which would do change the handling of internal pipes to this model:
> 
> 
> Current model:
> 
> CLI -> rpccli_INTERFACE_X -> _INTERFACE_X
> 
> Proposed model:
> 
> CLI -> rpccli_INTERFACE_X -> NDR_PUSH -> api_INTERFACE_X -> NDR_PULL

> I think the performance loss is acceptable given that we would gain much
> more correctnes and a cleaner API this way.

I agree with the approach.  I've not looked at the patch in great
detail, but I can't see any issues with a quick glance. 

Andrew Bartlett

-- 
Andrew Bartlett                                http://samba.org/~abartlet/
Authentication Developer, Samba Team           http://samba.org
Samba Developer, Cisco Inc.
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