> [On 27 Jul, @11:49, Pekka wrote in "getaddrinfo/TTL and resolver a ..."]
> > Hi,
> >
> > draft-gieben-resolver-application-interface-00.txt sketches what kind
> > of information the application and the resolver could have through an
> > interface. This has been discussed in dnsext at least in Feb 2004.
> > What has been the outcome?
>
> nothing yet, we had a lot of discussion about it, but nothing
> materialized out of it.
>
> Personally I think some other questions also need to be answered,
> like:
>
> o what service does the DNS actually provide?
> (it's a naming service, but application seem to want to know
> more and more about the resolution process. Esp. with DNSSEC).
>
> o where do applications start and resolvers end?
> A seen from the text below, apps now want to know TTLs. Where
> does it stop?
>
> o Each "application" (IPSEC for instance) has different (security) needs,
> and has a different set of "local policy" rules. What kind of
> interface is needed to allow for an application to make it's
> own policy decisions?
>
> Following this line of thinking we could come to the conclussion that
> an application wants to know the entire resolving chain, from the root
> down to the leave node. But when your local resolver does caching
> this might now be available... so there you go....
>
> > The reason why I got interested was because section 8.2 of
> > draft-ietf-dnsop-ipv6-dns-issues-08.txt (see below) shows that the
> > application should be able to be aware of the TTL of the records,
> > easily, so that it could discard expired records from the memory if
> > it's built around in such a way that it would be feasible to do so.
> > As it is, the applications typically query a name when they start and
> > use it forever, irregardless of the TTL. (And if the
> > application-resolver interface needs work in any case....)
> >
> > IMHO, it seem to be worth adding the TTL information to getaddrinfo()
> > functions.
I object to change getaddrinfo(). getaddrinfo() deployment is ongoing
and i do not want two variants of getaddrinfo - one with TTL, one
without TTL, depending on platforms. it just leads to confusion
with small benefit just for the sake of small set of users.
if a user wants TTL info, she can use getrrsetbyname().
itojun
.
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