Please hold off on evaluating this patch. I've been doing some more
testing and I am not sure it is right. -Jason

On Wed, Nov 30, 2011 at 3:43 PM, Jason Glasgow <jglasgow_at_google.com> wrote:

> Attached is a patch to fix a problem I've been having with the
> multi-interface. The problem that I've observed is that if the first name
> server is not available, the multi interface does not invoke the socket_cb
> when the DNS request to the first name server timesout.
>
> This bug can be reproduced if Curl is complied with --enable_ares and your
> code uses the multi socket interfaces and the CURLMOPT_SOCKETFUNCTION
> option. The way I test is to set up an iptables rule that discards the
> name server reply from the first name server. This forces a timeout and
> then cares tries to use the secondary name server. Without the patch, the
> client code is never informed of the new socket that cares is using.
>
> To test try:
> iptables -I INPUT \
> -s $(sed -n -e '/name/{s/.* //p;q}' /etc/resolv.conf)/32 \
> -j REJECT
> and then run a program which uses the multi-interface
>
> -Jason
>
>

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Received on 2011-11-30