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Re: [lwip-devel] [bug #56280] lwIP DNS need to support CNAME Resource Re

From: Christopher Nocker
Subject: Re: [lwip-devel] [bug #56280] lwIP DNS need to support CNAME Resource Record
Date: Wed, 15 Jul 2020 23:44:29 +1000

Hi Jeff,
Our implementations are slightly different in what they are trying to achieve.  I was trying to iterate over the response from the DNS server to see if an A record was present (i.e. when the DNS server would have done the recursion and all of the CNAMEs for the query would be in the response).  Your implementation is explicitly looking for the CNAME response to a query.
I have tried your implementation and queried a name which I know has a couple of CNAMEs in the response but my application was never able to resolve it.  Maybe I'm using it wrong?  I'm guessing that it is working for you?
Did you try my implementation?  Does my implementation suit your needs?

On Tue, Jun 30, 2020 at 8:21 PM Thompson, Jeff <JeffThompson@invue.com> wrote:
Attached is the solution I came up with. All my changes are conditionalized the macro CNAME_HACK. The entry point is the function netconn_gethostCname().

Jeff Thompson  |  Senior Electrical Engineer-Firmware
+1 704 752 6513 x1394
-----Original Message-----
From: Chris Nocker <INVALID.NOREPLY@gnu.org>
Sent: Monday, June 29, 2020 23:45
To: Simon Goldschmidt <goldsimon@gmx.de>; Gao Qingshui <gaoqingshui202@163.com>; Thompson, Jeff <JeffThompson@invue.com>; Chris Nocker <nocker02@gmail.com>; Sylvain Rochet <gradator@gradator.net>; lwip-devel@nongnu.org; lwip-members@nongnu.org
Subject: [bug #56280] lwIP DNS need to support CNAME Resource Record

Additional Item Attachment, bug #56280 (project lwip):

File name: 0001-DNS-Allowed-processing-of-a-DNS-response-that-contai.patch
Size:1 KB



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