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From: bernie@umbc3.umbc.edu (Bernard J. Duffy)
Newsgroups: comp.sys.sgi
Subject: Re: setting REMOTEHOST on rlogins
Summary: it is available to via utmp
Message-ID: <1991Jun21.173050.9868@umbc3.umbc.edu>
Date: 21 Jun 91 17:30:50 GMT
References: <1991Jun12.174725@spruce.gsfc.nasa.gov>
Organization: University of Maryland Baltimore County
Lines: 35

In article <1991Jun12.174725@spruce.gsfc.nasa.gov> karl@spruce.gsfc.nasa.gov (karl anderson) writes:
>I'm just getting acquainted with SGI machines after using Suns alot.
>I see that when I rlogin to one of our Irises, an environment variable
>named "REMOTEHOST" is set to the name of the machine I'm logging in
>from.  Is this something unique to IRIX?  I'd love to be able to do 
>that on my Suns - can anyone tell me how?  Please answer by email,
>as I don't ordinarily take this group.  TIA.
    You can make a simple C program that could set this for you and
it would be pretty easy to port to most of your un*x-es .  I've noticed
that the who command on most machines states which host a terminal
or X session started a particular login.  I think most of the "login"
(like rlogin and telnet) programs / daemons provide this information.

The informat for the REMOTEHOST is held in the world readable /etc/utmp
that the who utility reads for you.  Your non-suid (non-prived) program
can scan /etc/utmp and extract the REMOTEHOST.  This would be of use
to X users because you can make various terminal settings based on
the originating host (like ^? for DEL when it's not a window on an
IRIS server).

>
>--
>Karl A. Anderson		| Internet: karl@forest.gsfc.nasa.gov
>NASA/GSFC code 923 (STX)	| voice: (301) 286-3815
>Greenbelt, MD 20771		| #include "std_disclaimer"

Have fun,   Bernie   bernie@pinhead.acs.umbc.edu

UMBC: the only University with "County" in its name...  that's why they
      want to change it.  MD has lots of schools and very few big cities.
-- 
Bernie Duffy   Systems Programmer II | Bitnet    :  BERNIE@UMBC2
Academic Computing Services - L005e  | Internet  :  BERNIE@UMBC2.UMBC.EDU
Univ. of Maryland Baltimore County   | UUCP      :  ...!uunet!umbc3!bernie
Baltimore, MD  21228   (U.S.A.)      | W: (301) 455-3231  H: (301) 744-2954