From mboxrd@z Thu Jan  1 00:00:00 1970
From: John Darrington <john@darrington.wattle.id.au>
Subject: Re: Neon and reverse address lookup
Date: Sat, 18 Jan 2014 22:49:08 +0100
Message-ID: <20140118214908.GA31816@jocasta.intra>
References: <20140118124847.GA6166@debian>
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To: Ludovic Court??s <ludo@gnu.org>
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I'm not sure if I'm reading your message as you intended, but for
the record, 127.0.0.1 should ALWAYS resolve to "localhost" - without
the domain name, and NOT to the canonical hostname.

If it does not, then a lot of things break.

J'


On Sat, Jan 18, 2014 at 10:32:31PM +0100, Ludovic Court??s wrote:
    =20
     So /etc/hosts is not enough for reverse lookups to work.
    =20
     With nscd turned off, I tried this:
    =20
       guile -c '(pk (gethostbyaddr (inet-pton AF_INET "127.0.0.1")))'
    =20
     If nsswitch.conf is removed, then that resolves to ???localhost??? (in=
stead
     of the actual host name.)
    =20
     If, in addition, resolv.conf is removed, then that fails as seen above.
    =20
     With nsswitch.conf alone, it resolves correctly (Mark was right.)
     And this works with only ???hosts: files??? in nsswitch.conf.
    =20
     It???s surprising that there???s this discrepancy between how NSS work=
s for
     getaddrinfo and for gethostbyaddr.  At any rate, we may be able to sol=
ve
     this at the libc level.
    =20
     Thanks,
     Ludo???.
    =20

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