Subject: Re: [PATCH] Allow use of TLS 1.3

From: Ævar Arnfjörð Bjarmason <[email-masked]>
Date: Fri, 23 Mar 2018 19:37:08 +0100

On Fri, Mar 23 2018, Loganaden Velvindron wrote:

> Done during IETF 101 hackathon

Hi. Thanks. Let's add a meaningful commit message to this though,
something like:

    Add a tlsv1.3 option to http.sslVersion in addition to the existing
    tlsv1.[012] options. libcurl has supported this since 7.52.0.

> --- a/http.c
> +++ b/http.c
> @@ -61,6 +61,9 @@ static struct {
>  	{ "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
>  	{ "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
>  	{ "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
> +#if LIBCURL_VERSION_NUM >= 0x075200
> +	{ "tlsv1.3", CURL_SSLVERSION_TLSv1_3 }
> +#endif

I wonder if this wouldn't be better as:

    +#ifdef CURL_SSLVERSION_TLSv1_3
    +	{ "tlsv1.3", CURL_SSLVERSION_TLSv1_3 }
    +#endif

We've been bitten before by doing version checks on libcurl code, only
to find that some distros are actively backporting features, so checking
the specific macros is usually better.

>  #endif
>  };
>  #if LIBCURL_VERSION_NUM >= 0x070903