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Received: (at submit) by bugs.debian.org; 28 Sep 2001 15:10:00 +0000
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From: Greg Ward <[EMAIL PROTECTED]>
Subject: telnet: telnet ignores /etc/nsswitch.conf
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Date: Fri, 28 Sep 2001 11:09:58 -0400
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Package: telnet
Version: 0.17-15
Severity: normal

The telnet.netkit client doesn't seem to use the resolver library in the
usual way, ie. /etc/hosts first, then DNS.  At least that is how I have
it configured in /etc/nsswitch.conf:
  hosts:          files dns

Rather, it looks as though it always uses DNS first, and then falls back
on /etc/hosts if the DNS lookup fails.  IOW, it seems that telnet acts
as though that line were
  hosts:          dns files

Proof: my /etc/hosts starts with this line:
  127.0.0.1       cthulhu localhost cthulhu.gerg.ca

Most TCP clients (everything from netcat to Opera) treat "cthulhu" and
"cthulhu.gerg.ca" identically, ie. as 127.0.0.1.  The gethostbyname()
library call certainly pays attention to my /etc/hosts file:
  $ python
  Python 2.1 (#2, May  8 2001, 10:50:59) 
  [GCC 2.95.2 20000220 (Debian GNU/Linux)] on linux2
  Type "copyright", "credits" or "license" for more information.
  >>> from socket import *
  >>> gethostbyname("cthulhu.gerg.ca")
  '127.0.0.1'

But telnet goes to DNS first, and uses the IP address that the outside
world sees for my FQDN (assigned by my ISP, DNS-served by dyndns.org):

  $ telnet cthulhu.gerg.ca 80
  Trying 24.201.33.127...

Because I have iptables setup to treat 127.0.0.1 very differently from
my external IP address, this doesn't work.  That's annoying, and it's
inconsistent with just about every other TCP application on my system,
which all seem to respect /etc/nsswitch.conf and therefore consult
/etc/hosts first.

-- System Information
Debian Release: testing/unstable
Kernel Version: Linux cthulhu 2.4.10 #1 Mon Sep 24 21:13:20 EDT 2001 i686 
unknown

Versions of the packages telnet depends on:
ii  libc6          2.2.4-1        GNU C Library: Shared libraries and Timezone
ii  libncurses5    5.2.20010318-3 Shared libraries for terminal handling


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Date: Mon, 11 Jul 2005 14:43:19 -0400 (EDT)
From: Daniel Jonan <[EMAIL PROTECTED]>
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closing


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