Author: Ian Zimmerman Date: To: exim-dev Subject: Re: [exim-dev] Bug 2369: single-key lookup type based on
libcorkipset
On 2019-02-26 17:28, Jeremy Harris wrote:
> > devuan-205f!35 exim$ cat strange-iplist
> > "0000:0000:0000:0000:0000:ffff:0102:0203" : data
> > "::ffff:102:203" : also_data
> > 1.2.3.4 : more_data
>
>
> > devuan-205f!38 exim$ ./src/build-Linux-aarch64/exim -C /home/itz/exim/exim.conf -be '${lookup{0000:0000:0000:0000:0000:ffff:0102:0203}iplsearch{/home/itz/exim/strange-iplist}{good}{bad}}'
> > bad
> > devuan-205f!39 exim$ ./src/build-Linux-aarch64/exim -C /home/itz/exim/exim.conf -be '${lookup{::ffff:102:203}iplsearch{/home/itz/exim/strange-iplist}{good}{bad}}'
> > bad
>
> The address being looked up, ::ffff:102:203, is an ipv6-mapped ipv4
> and we'd expect it to match 1.2.2.3 in the file. But you only have
> 1.2.3.4
But according to the spec (section 10.11) the mapping is done _when
checking an address for membership in a host list_. I read that (IMO
with justification) as meaning a bare lookup does no such translation,
because none is mentioned in the part of the spec about lookups (that
would be section 9.3 I guess). So at least this is a documentation bug.
The fact that the address I tested was a mapped one was intentional, of
course, because those are the ones presenting potential ambiguity when
expressed in a dot delimited form.
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