Re: [exim] IPv6 address comparison, and callout vs VRFY

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Author: Philip Hazel
Date:  
To: David Woodhouse
CC: exim-users, Wouter Verhelst
Subject: Re: [exim] IPv6 address comparison, and callout vs VRFY
On Fri, 19 Nov 2004, David Woodhouse wrote:

> Perhaps I'm being dim, but I can't see why it can't be handled
> identically. Why does it matter that the IP address under test is
> explicitly specified by the match_host statement, rather than coming
> from getpeername() or the command line's '-bh' option?


The point that bothers me is that in a host list in an ACL or router,
there are in effect two identifiers, the IP address and the name. Both
are implicit. The question the is: if a match_host condition is
implemented, do you allow the caller to specify an IP address, or a
name, or both? Clearly one can come up with some rules such as "specify
only the IP address, and if a name is required, it is looked up", but I
was never sure about what would be right, so I just ducked out of doing
it.

-- 
Philip Hazel            University of Cambridge Computing Service,
ph10@???      Cambridge, England. Phone: +44 1223 334714.
Get the Exim 4 book:    http://www.uit.co.uk/exim-book