[ipxe-devel] Unable to resolve CNAME

Nicolas Sylvain nsylvain at gmail.com
Wed Feb 26 16:44:44 UTC 2014

Thanks for the quick fix!


On Wed, Feb 26, 2014 at 8:19 AM, Michael Brown <mcb30 at ipxe.org> wrote:

> On 19/02/14 22:20, Nicolas Sylvain wrote:
>> After a few months without updating my iPXE binary, I updated it and now
>> I'm unable to resolve any CNAME.
> Should now be fixed:
>   http://git.ipxe.org/ipxe.git/commitdiff/ff341c1
>  www.cnn.com <http://www.cnn.com> fails as well, but this one because of
>> a "recursion exceeded".
> Turns out to be the same problem.  The bug related to not properly
> recalculating the length of the name after receiving a CNAME record.  In
> the case of "storage.googleapis.com", this resulting in iPXE attempting
> to look up "storage-ugc.l.googleus" (truncated to the length of "
> storage.googleapis.com").  In the case of "www.cnn.com", it resolves to "
> www.cnn.com.vgtf.net"; truncating this to the length of "www.cnn.com"
> gives exactly "www.cnn.com", hence the eventual "recursion exceeded"
> error.
> The problem occurs only when the CNAME is longer than the original name,
> which is how this managed to slip through testing.
> Thanks for reporting the problem, and with enough detail to allow me to
> reproduce it quickly!
> Michael
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