PATCH: dig warn user when querying ANY towards recursive server (fwd)
andris at hpl.hp.com
Sun Jul 22 23:27:49 UTC 2012
On 7/22/2012 10:19 AM, Paul Wouters wrote:
> (I don't think this made it to the list before, mixup of email addresses)
> Please consider including this patch,
> ---------- Forwarded message ----------
> Date: Mon, 2 Jul 2012 17:45:08
> From: Paul Wouters <paul at nohats.ca>
> Cc: Paul Vixie <paul at redbarn.org>
> To: bind-users at lists.isc.org
> Subject: PATCH: dig warn user when querying ANY towards recursive server
> As recently came up, when querying a recursive caching server for ANY
> will only result on cached entries being returned, and not the whole
> possible set. For that you need to query the authoritative server.
> I wasn't aware of this, and since I'm sure I'll forget about this again
> too, I wrote a patch for dig to remind me. Please apply :)
Don't forget that recursive servers can also host the zone being
queried. Testing for the "aa" flag makes the message more accurate.
> if ((query->lookup->rdtype == dns_rdatatype_any) &&
> ((msg->flags & DNS_MESSAGEFLAG_RA) != 0) &&
> (msg->flags & DNS_MESSAGEFLAG_AA) == 0)
> printf("\n\n;; WARNING: Requested ANY data "
> "from a non-authoritative recursive "
> "server.\n;; The cached answer "
> "might be incomplete.\n\n");
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