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Re: [EXTERNAL] Re: Feature request: provide ability to set a global callback function telling libcurl if IPv6 works on the system
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From: Dan Fandrich via curl-library <curl-library_at_lists.haxx.se>
Date: Wed, 21 Sep 2022 18:22:50 -0700
On Wed, Sep 21, 2022 at 06:21:08PM -0700, Dan Fandrich wrote:
> On Thu, Sep 22, 2022 at 12:24:57AM +0000, Dmitry Karpov via curl-library wrote:
> > > If Curl_ipv6works() were not called in the CURL_IPRESOLVE_V6 case, would
> > > that solve the issues that are remaining?
> >
> > Your question was:
> > "So, if libcurl eliminated that call in the CURL_IPRESOLVE_V4 case, would it fix your problem?"
>
> That was my previous question. The question above refers to CURL_IPRESOLVE_V6.
>
> > YES, adding a callback doesn't fix anything on its own. But it allows curl applications to work around problems/regressions caused by default Curl_ipv6works() behavior.
>
> I'm betting that this problem can be fixed without adding a new callback,
> especially one that goes against the way libcurl works, namely that callbacks
> are used to change behaviour during a transfer.
You also didn't answer this question:
> Since you're calling it a regression, then where did that regression occur? Was
> it in libcurl or in the kernel? Maybe this problem needs to be solved
> elsewhere.
Date: Wed, 21 Sep 2022 18:22:50 -0700
On Wed, Sep 21, 2022 at 06:21:08PM -0700, Dan Fandrich wrote:
> On Thu, Sep 22, 2022 at 12:24:57AM +0000, Dmitry Karpov via curl-library wrote:
> > > If Curl_ipv6works() were not called in the CURL_IPRESOLVE_V6 case, would
> > > that solve the issues that are remaining?
> >
> > Your question was:
> > "So, if libcurl eliminated that call in the CURL_IPRESOLVE_V4 case, would it fix your problem?"
>
> That was my previous question. The question above refers to CURL_IPRESOLVE_V6.
>
> > YES, adding a callback doesn't fix anything on its own. But it allows curl applications to work around problems/regressions caused by default Curl_ipv6works() behavior.
>
> I'm betting that this problem can be fixed without adding a new callback,
> especially one that goes against the way libcurl works, namely that callbacks
> are used to change behaviour during a transfer.
You also didn't answer this question:
> Since you're calling it a regression, then where did that regression occur? Was
> it in libcurl or in the kernel? Maybe this problem needs to be solved
> elsewhere.
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