On Sat, Sep 4, 2021 at 9:57 AM Antonio Quartulli <[email protected]> wrote:
> diff --git a/src/openvpn/options.c b/src/openvpn/options.c
> index 0d6b85cf..4d971a56 100644
> --- a/src/openvpn/options.c
> +++ b/src/openvpn/options.c
> @@ -3125,6 +3125,29 @@ options_postprocess_cipher(struct options *o)
> }
> }
>
> +/**
> + * Returns if we want 'backwards-compatibility' up to (but not included) a
> + * certain version
> + *
> + * @param version the oldest version that does not compatibility
>
I feel like you dropped a word in here ^^
> + * e.g. 20400 for all versions < 2.4.0
> + * @return whether compatibility should be enabled
> + */
> +static bool
> +need_compatibility_before(const struct options *o, int version)
>
I feel like you want to do `unsigned int` on your version parameter here
(why would a version go negative?) ...
> +{
> + return o->backwards_compatible != 0 && o->backwards_compatible <
> version;
> +}
> +
> +/**
> + * Changes default values so that OpenVPN can be compatible with the user
> + * specified version
> + */
> +static void
> +options_set_backwards_compatible_options(struct options *o)
> +{
> +}
> +
> static void
> options_postprocess_mutate(struct options *o)
> {
> @@ -3137,6 +3160,8 @@ options_postprocess_mutate(struct options *o)
> helper_keepalive(o);
> helper_tcp_nodelay(o);
>
> + options_set_backwards_compatible_options(o);
> +
> options_postprocess_cipher(o);
> options_postprocess_mutate_invariant(o);
>
> @@ -6698,6 +6723,18 @@ add_option(struct options *options,
> setenv_str(es, p[1], p[2] ? p[2] : "");
> }
> }
> + else if (streq(p[0], "compat-mode") && p[1] && !p[3])
> + {
> + unsigned int major, minor, patch;
> + if (!(sscanf(p[1], "%u.%u.%u", &major, &minor, &patch) == 3))
> + {
> + msg(msglevel, "cannot parse version number for --compat-mode:
> %s",
> + p[1]);
> + goto err;
> + }
> +
> + options->backwards_compatible = major * 10000 + minor * 100 +
> patch;
> + }
> else if (streq(p[0], "setenv-safe") && p[1] && !p[3])
> {
> VERIFY_PERMISSION(OPT_P_SETENV);
> diff --git a/src/openvpn/options.h b/src/openvpn/options.h
> index b0e40cb7..98c21a2a 100644
> --- a/src/openvpn/options.h
> +++ b/src/openvpn/options.h
> @@ -225,6 +225,10 @@ struct options
>
> /* enable forward compatibility for post-2.1 features */
> bool forward_compatible;
> + /** What version we should try to be compatible with as major * 10000
> +
> + * minor * 100 + patch, e.g. 2.4.7 => 20407 */
> + unsigned int backwards_compatible;
>
... doubly so because you use `unsigned int` (imo rightly) here.
> +
> /* list of options that should be ignored even if unknown */
> const char **ignore_unknown_option;
>
> --
> 2.32.0
>
>
>
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>
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