sectransp: support CURLINFO_CERTINFO

[sergio-nsk]

I need it for verifying certificate chains with root certificates missing in system storages.

Fixes #4130

Also fixed compiler warning: unused buffer, when the option CURL_DISABLE_VERBOSE_STRINGS is ON.

[danielgustafsson]

This won't make it into 7.78.0, so it should sat 7.79.0. That being said, I think we need a more structured way to document the version availability than free text like this - that's not the responsibility of this patch but it's worth to start thinking about.

[danielgustafsson]

This seems unrelated?

[sergio-nsk]

Yes, this is unrelated. It fixes the warning unused local variable buffer when I compile with cmake option -DCURL_DISABLE_VERBOSE_STRINGS=ON. I can remove this change it from this PR.

[danielgustafsson]

Yes, this is unrelated. It fixes the warning unused local variable buffer when I compile with cmake option -DCURL_DISABLE_VERBOSE_STRINGS=ON. I can remove this change it from this PR.

Please do, and file it as its own PR. That smells like a bug that we should fix in 7.78 already.

[sergio-nsk]

Please do, and file it as its own PR. That smells like a bug that we should fix in 7.78 already.

See #7377.

Updated the supported version.

[bagder]

Can you please rebase this (and fix the merge conflicts) and force-push?

[bagder]

The sectransp CI build failed:

vtls/sectransp.c:2975:66: error: expected ')'
        result = collect_server_cert_single(data, server_cert, i);
                                                                 ^
vtls/sectransp.c:2974:64: note: to match this '('
        server_cert = (SecCertificateRef)CFArrayGetValueAtIndex(server_certs,
                                                               ^
vtls/sectransp.c:2957:47: error: implicit conversion loses integer precision: 'CFIndex' (aka 'long') to 'int' [-Werror,-Wshorten-64-to-32]
        result = Curl_ssl_init_certinfo(data, count);
                 ~~~~~~~~~~~~~~~~~~~~~~       ^~~~~
vtls/sectransp.c:2972:47: error: implicit conversion loses integer precision: 'CFIndex' (aka 'long') to 'int' [-Werror,-Wshorten-64-to-32]
        result = Curl_ssl_init_certinfo(data, count);
                 ~~~~~~~~~~~~~~~~~~~~~~       ^~~~~

[sergio-nsk]

It seems I've broken the code while fixing the merge conflicts.

[bagder]

Thanks!