The `psl` crate's domain_str / suffix_str do byte-exact lookups against
the public-suffix list, so uppercase or trailing-dot inputs (e.g.
"Example.COM" or "example.com." from a DNS Name) silently return None.
Several call sites were passing through user- or DNS-supplied domains
unmodified.
Add a small psl-utils crate that wraps the psl crate:
* normalize_domain(&str) -> Cow<str>: strips a single trailing dot and
lowercases ASCII; borrows when the input is already normalized so
the hot path (alignment loop) doesn't allocate.
* domain_str / suffix_str: thin re-exports for callers that have
already normalized.
psl-utils becomes the only workspace crate that directly depends on
the psl crate; kumo-dmarc and mod-string switch to depending on
psl-utils instead.
Updated call sites:
* kumo-dmarc record.rs: is_relaxed_aligned / is_strict_aligned now
normalize both inputs first. Replaces the prior eq_ignore_ascii_case
comparisons.
* kumo-dmarc lib.rs: the organizational-domain fallback in
DmarcContext::check now normalizes from_domain before calling
domain_str and compares against the normalized form. Previously a
mixed-case From: header would skip the _dmarc.<org> lookup entirely.
* mod-string lib.rs: the Lua-exposed string.psl_domain and
string.psl_suffix bindings normalize their input. Behavior change:
inputs that previously returned nil due to case or trailing dot now
resolve.
Co-authored-by: Wez Furlong <wez@wezfurlong.org>
Closes: https://github.com/KumoCorp/kumomta/pull/513
If you have a lot of RAM, using only default percentages could
potentially leave some RAM unused. These lua functions
allow more precise control over the limits.
kay ozaki
Wez Furlong