Re: Implicit MX and A RRs
Ned Freed <ned.freed@mrochek.com> Fri, 28 March 2008 17:11 UTC
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Date: Thu, 27 Mar 2008 17:41:39 -0700
From: Ned Freed <ned.freed@mrochek.com>
Subject: Re: Implicit MX and A RRs
In-reply-to: "Your message dated Fri, 28 Mar 2008 00:20:16 +0000" <alpine.LSU.1.00.0803280011300.10284@hermes-1.csi.cam.ac.uk>
References: <200803261141.m2QBfJbT091722@drugs.dv.isc.org> <98BB1843C1A06A1A50D6F2DA@p3.JCK.COM> <47EA61CD.1080605@att.com> <20080327070022.GA18854@paja.nic.funet.fi> <alpine.LSU.1.00.0803280011300.10284@hermes-1.csi.cam.ac.uk>
To: Tony Finch <dot@dotat.at>
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Cc: Matti Aarnio <mea@nic.funet.fi>, Tony Hansen <tony@att.com>, ietf@ietf.org, SMTP Interest Group <ietf-smtp@imc.org>
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> On Thu, 27 Mar 2008, Matti Aarnio wrote: > > > > There will be lots of legacy codes using legacy APIs for long future. > > I do use getaddrinfo() API myself, and permit it do all queries to > > get addresses. Thus it will also query for A in addition to AAAA. > > It can even be ordered to ignore IPv4 or IPv6 as sysadmin wants. > There's an amusing interop issue with getaddrinfo and DNS lookups in MTAs. > In many implementations getaddrinfo will perform SRV lookups for you (as > an extension to /etc/services or getservbyname), so it probably doesn't do > the right thing (or it can be persuaded not to do the right thing by > people with perverse DNS setups). On Mac OS X, the daemon that handles > getaddrinfo has a special case for port 25 which performs MX lookups for > you (like SRV lookups), so it certainly does't do the right thing! Serious > email software needs to talk to the low-level resolver API in situations > when it cares about the detailed semantics of domain resolution, and it > needs a way of talking to the high-level resolver API when the sysadmin > chooses so that /etc/hosts, /etc/nsswitch.conf, and similar platform- > specific settings can do their thing. If anything this understates the problems MTAs face. Sure, you can use your own resolver routines and avoid these semantics issues with getaddrinfo, but now you're doing purely DNS-based address lookup. It may not be standardized, but it is surprisingly common to use other name services or host files for this within an administative domain. And while it may be possible to duplicate the logic to do these other sorts of lookups, you're now talking about substantially more code and complexity, not to mention platform and environmental dependencies. Ned _______________________________________________ IETF mailing list IETF@ietf.org https://www.ietf.org/mailman/listinfo/ietf
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- Re: Last Call: draft-klensin-rfc2821bis (Simple M… John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis (Simple M… Pekka Savola
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- Re: Last Call: draft-klensin-rfc2821bis Bill Manning
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- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
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- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Implicit MX and A RRs Tony Hansen
- Re: Last Call: draft-klensin-rfc2821bis John Levine
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis John C Klensin
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- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
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- Re: Last Call: draft-klensin-rfc2821bis David Conrad
- RE: Last Call: draft-klensin-rfc2821bis Tony Hain
- Re: Last Call: draft-klensin-rfc2821bis Dave Crocker
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- RE: Last Call: draft-klensin-rfc2821bis Hallam-Baker, Phillip
- RE: Last Call: draft-klensin-rfc2821bis Tony Hain
- RE: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Implicit MX and A RRs John C Klensin
- Re: Implicit MX and A RRs Matti Aarnio
- RE: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis Mark Andrews
- Re: Implicit MX and A RRs Tony Finch
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- Re: Last Call: draft-klensin-rfc2821bis Mark Andrews
- Re: Last Call: draft-klensin-rfc2821bis Joe Abley
- Re: Last Call: draft-klensin-rfc2821bis Mark Andrews
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- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis David Morris
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
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- Re: Last Call: draft-klensin-rfc2821bis Douglas Otis
- Re: Last Call: draft-klensin-rfc2821bis John C Klensin
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- Re: Last Call: draft-klensin-rfc2821bis Ned Freed
- Re: Implicit MX and A RRs Ned Freed
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
- Re: Last Call: draft-klensin-rfc2821bis John C Klensin
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
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- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
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- Re: Last Call: draft-klensin-rfc2821bis Pekka Savola
- Re: Last Call: draft-klensin-rfc2821bis Frank Ellermann
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- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
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- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
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- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
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- Re: Last Call: draft-klensin-rfc2821bis David Morris
- Re: Last Call: draft-klensin-rfc2821bis Dave Crocker
- Re: Last Call: draft-klensin-rfc2821bis Mark Andrews
- Re: Last Call: draft-klensin-rfc2821bis Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis John C Klensin
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- Re: Last Call: draft-klensin-rfc2821bis Tony Finch
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- Re: Last Call: draft-klensin-rfc2821bis Dave Crocker
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- Re: Last Call: draft-klensin-rfc2821bis: closing … Dave Crocker
- Re: Last Call: draft-klensin-rfc2821bis: closing … Keith Moore
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- Re: Last Call: draft-klensin-rfc2821bis: closing … Douglas Otis
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- Re: Last Call: draft-klensin-rfc2821bis: closing … Henning Schulzrinne
- Re: Last Call: draft-klensin-rfc2821bis: closing … Dave Crocker
- Re: Last Call: draft-klensin-rfc2821bis: closing … Paul Smith
- Re: Last Call: draft-klensin-rfc2821bis: closing … Keith Moore
- Re: Last Call: draft-klensin-rfc2821bis: closing … Tom.Petch
- Re: Last Call: draft-klensin-rfc2821bis: closing … Hector Santos
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