[EXT] FR 3.0 radsec : dynamic home server discovery status

[Arran Cudbard-Bell]

> On Mar 4, 2020, at 10:38 AM, Brian Julin <BJulin at clarku.edu> wrote:
> 
> 
> There's some stale... geez 7 years stale I can't believe it's been that long... code
> in my github tree that does async lookups via NAPTR.  But it's just the lookup.
> It doesn't touch the home server config to add or remove home servers and
> I think given what the core devs say about v4, you'd be much better off trying
> to pull that off under v4's architecture.

I wrote the async glue for our rlm_unbound module, 

https://github.com/FreeRADIUS/freeradius-server/blob/master/src/modules/rlm_unbound/io.c

but it turns out libunbound doesn't expose the same decode functions to callers that implement their own I/O routines.

If someone knowledgable wanted to figure out the decoding, and add a NAPTR  xlat (there are multiple existing examples for other record types) then that'd probably move things forward the fastest.

-Arran