On Thu, 08 Sep 2005 09:55:52 +0100, Jeremy Harris <jgh@???>
wrote:
>Marc Haber wrote:
>> Can I do a DNS lookup in a string expansion?
>
>${lookup dnsdb
That is cute. I didn't see that. However, after thinking about these
things for a long time and discussing them with some exim people in my
environment, I think that having the lookup dnsdb option is not
enough, unfortunately.
What is needed here is a lookup type which will iterate through all
lines in a text file (like lsearch) and return all records for which a
given expression is true. Clearly, this cannot be a single-key lookup
since most database backends that have a single-key interface cannot
do this, but a query-style lookup for text files (alias-file style)
will probably be possible.
What I'd like to have is something along the lines
|${lookup textfile {/etc/exim4/passwd.client; match{${lookup dnsdb{a=$1}{$value}fail}}{$host_address}}{$2}fail}}
which will return (modulo bracketing and other syntax errors) the
second field of any line (the first line?) in /etc/exim4/passwd.client
for whose first field exists an A record pointing to the IP address of
the we are actually talking to.
Is this already possible in exim? If not, I'd like to have that
possibility in a future exim version, which will probably also ease
debugging of database connectors.
Greetings
Marc
--
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Marc Haber | " Questions are the | Mailadresse im Header
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