Re: Dynamic updates with DLZ

I think there were a significant number of functions that would need to be implemented.  Also, there is code in sdlz.c to convert records in text format to Bind's internal structures, but I don't think the code exists to go the other way (bind structures -> text).  Implementing that would be necessary to support any of the existing DB drivers.  Additionally, you'll need to implement the update code in each driver (or just the one you want), and also deal with transactions.  Transactional handling isn't necessary in the drivers currently because everything is read only.

Rob



----- Original Message ----
> From: Martin Nagy <[email protected]>
> To: [email protected]
> Cc: [email protected]
> Sent: Friday, September 12, 2008 11:02:30 AM
> Subject: Re: [Bind-dlz-testers] Dynamic updates with DLZ
> 
> Hi Rob,
> this really surprises me. I only took a brief look at the code, but
> still, I thought that it would suffice to implement some of the
> functions that currently aren't implemented in sdlz.c. Or doesn't the DB
> API itself support updates? What am I missing here?
> Your insight would be much appreciated. Thanks!
> 
> Regards,
> Martin
> 
> On Fri, 12 Sep 2008 05:35:28 -0700 (PDT), Rob Butler
> wrote:
> > Hi Martin,
> > 
> > I would welcome a patch to incorporate dynamic update capabilities
> > into DLZ.  Its something I've wanted to do for a while, but been much
> > too busy to get around to.  Unfortunately, it is a LOT of work
> > because of how BIND is internally architected.  It's not impossible
> > to do, but its more work than I felt like taking on.  In fact, I feel
> > it would be less work to build an entirely new DNS server that was
> > designed for such capabilities from the outset VS adding it to BIND.
> > 
> > I don't know if the ISC would accept your patch into BIND.  You would
> > have to contact them directly, but at least your patch could find a
> > home with DLZ.
> > 
> > To get started take a look at the DLZ API & the SDLZ API that are
> > within the DLZ patch.  They will help you get familiar with the BIND
> > DB API which is what you'll have to build to.
> > 
> > Rob (DLZ creator)
> > 
> > 
> > 
> > ----- Original Message ----
> > > From: Martin Nagy 
> > > To: [email protected]
> > > Sent: Thursday, September 11, 2008 8:09:00 PM
> > > Subject: [Bind-dlz-testers] Dynamic updates with DLZ
> > > 
> > > Hi,
> > > I'd like to use DLZ with dynamic updates. This would mean that a DLZ
> > > backend could optionally have a function to handle the updates and
> > > write it back to the database. The reason I want this is that I'd
> > > like to have BIND with LDAP backend. Then, I'd like the updates to
> > > be made with GSS-TSIG. This could be done by hosts themselves, BIND
> > > already supports GSS-TSIG and it is possible to configure it to,
> > > for example, allow a machine to only update it's own record (by
> > > looking at the kerberos principal). This is why I'd like this
> > > feature.
> > > 
> > > Would it be possible to implement this? I'd even be willing to make
> > > a patch, I'd just like to know if the patch could then be accepted.
> > > Also, some hints as to where to start looking at the code would be
> > > much appreciated.
> > > 
> > > On a related note, would it be possible to patch BIND in such a way
> > > that it could dynamically load DLZ backends using dlopen()? Again, I
> > > guess this is more of a "would it get accepted?" question.
> > > 
> > > Also, am I contacting the right guys? Or should I ask on some
> > > official BIND mailing list? I'm not sure what's the relation
> > > between the DLZ developer(s) and BIND developers, since the DLZ
> > > code is already included in BIND codebase.
> > > 
> > > I'll be grateful for any help! Thanks.
> > > 
> > > Regards,
> > > Martin Nagy
> 
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