[150677] in North American Network Operators' Group
Re: dns and software, was Re: Reliable Cloud host ?
daemon@ATHENA.MIT.EDU (Tim Franklin)
Thu Mar 1 05:55:44 2012
Date: Thu, 01 Mar 2012 10:54:49 -0000 (GMT)
From: Tim Franklin <tim@pelican.org>
To: Nanog <nanog@nanog.org>
In-Reply-To: <CAAAwwbV7TmtdokvV2ii-kE3tK336Co1LN+BVMwCxKbtEq076yw@mail.gmail.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
> GAI/GNI do not return TTL values, but this should not be a problem.
> If they were to return anything, it should not be a TTL, but a time()
> value, after which the result may no longer be used.
>
> One way to achieve that would be for GAI to return an opaque structure
> that contained the IP and such a value, in a manner consumable by the
> sockets API, and adjust connect() to return an error if passed a
> structure containing a ' returned time + TTL' in the past.
AF_INET_TTL and AFINET6_TTL, with correspondingly expanded struct sockaddr_* ?
Code that explictly requests AF_INET or AF_INET6 would get what it was expecting, code that requests AF_UNSPEC on a system with modified getaddrinfo() would get the expanded structs with the different ai_family set, and could pass them straight into a modified connect().
I'm sure I'm grossly oversimplifying somewhere though...
Regards,
Tim.
