Viktor Dukhovni:
> On Fri, Nov 19, 2021 at 05:07:21PM -0800, Mel Pilgrim wrote:
>
> > I read in transport(5), virtual(5), et al that Postfix will case-fold
> > query strings, but for one specific project I need it to not do that.
> > Are there any tunables for this? I didn't see anything in postconf -d
> > output that looked related.
> >
> > The short explanation is that I need to be able to do lookups against a
> > strict-match-only case-sensitive database and the records are mixed case
> > (e.g. al...@example.com). I'm fully aware of how stupid that is but
> > this is not my data, not my system, not my money.
In email RFCs the domain portion is case case-insensitive, so these
people are going to miss a ton of email. A quick search over years
of my email shows that very few senders capitalize my domain name.
> Is this for just one table, one database type, or *all* Postfix lookups
> including btree, cdb, ...
>
> > If this isn't possible, can someone point me toward the code I would
> > need to change so I can create a local, unsupported version if that ends
> > up being my only recourse?
>
> You'll need a custom build, there's no built-in support for configurable
> case folding outside the regexp tables (via /pattern/i).
- If you can use pcre of regexp, you can greatly speed up searches with
"IF /^[Aa]/ ..ENDIF" and so on.
- If you must use other tables, update src/util/dict.h
#define DICT_FLAG_FOLD_FIX (0) /* case-fold key with fixed-case map */
#define DICT_FLAG_FOLD_MUL (0) /* case-fold key with fixed-case map */
This will nuke the flags that request case folding.
Wietse
