[exim-dev] [Bug 459] Generic variable containing the item lo…

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Autor: bug459
A: exim-dev
Assumpte: [exim-dev] [Bug 459] Generic variable containing the item looked for in a (query-style) lookup
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------- Comment #3 from ph10@??? 2007-02-01 10:14 -------
On Thu, 1 Feb 2007, holmgren@??? wrote:

> ------- Comment #2 from holmgren@??? 2007-02-01 10:06 -------
> On Thursday 01 February 2007 10:34, ph10@??? wrote:
> > What should this key contain for a hosts condition?
> :-P
> Why, the hostname of course.

So, if somebody says

hosts =

which works quite happily now, you want Exim to try to look up a
hostname before processing that list? Is that right? That is highly
incompatible because it is resource-wasteful and there is the defer

> You'd have to use e.g. net-mysql to make the IP
> address be the key, in a manner similar to single-key lookups.

The string expansion happens *before* the list is scanned, and therefore
*before* Exim knows what kind of items there are in the list.

> But the big problem is that the query string is in many cases expanded before
> it's passed to match_isinlist() or match_address_list(). That would have to
> change.

Massively incompatible change.

I know this is an awkward area, but it has "grown up" that way, and to
disturb it now would, I believe, cause hassle because it would almost
certainly affect existing installations. Therefore, I think any change
of this magnitude must be an "Exim 5" issue.


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