Define an array that contains all of the TLS versions

[kevinburke]

Postgres has configuration flags that let you set the minimum and the maximum TLS versions. I am thinking about implementing this with logic like this:

min_version = conn->ssl_min_version or 'TLS 1.2'
max_version = conn->ssl_max_version or None

versions = []
for version in rustls_tls_versions:
    if version >= min_version and (max_version is None or version <= max_version):
        versions.push(version)
rustls_client_config_builder_set_versions(versions)

The question is how to implement rustls_tls_versions... I can define all of the constants myself, in an array, but then if rustls adds TLS1.4, or TLS2, my array is going to be out of date, and people can't select a higher version, even if rustls can negotiate it..

It might be better if rustls-ffi declares an array containing all of the TLS versions. I can use that in my code to ensure that I'm not accidentally bounding the maximum TLS version that can be negotiated.

Alternatively, rustls-ffi could have a function that accepts a minimum and a maximum and returns me a uint16_t*.

[cpu]

This looks resolved w/ #242

[cpu]

I'm going to close this now that I have those perms on this repo. If I'm mistaken about this having been addressed in #242 I can reopen.