Date: Wed, 3 Jan 1996 11:27:05 -0600 (CST) From: Joe Greco <jgreco@brasil.moneng.mei.com> To: gestur@islandia.is (Gestur A. Grjetarsson) Cc: freebsd-hackers@freebsd.org, freebsd-questions@freebsd.org, admin@islandia.is Subject: Re: prevent paralell modem connection Message-ID: <199601031727.LAA13230@brasil.moneng.mei.com> In-Reply-To: <199601031528.PAA12069@hummer.islandia.is> from "Gestur A. Grjetarsson" at Jan 3, 96 03:28:03 pm
next in thread | previous in thread | raw e-mail | index | archive | help
> Hello,
>
> I'd like to ask you,
>
> Could users on FreeBSD system hold two or more modem connections at
> same time, parallel logged on ?
Sure.
> If so, is there a way to prevent people to be able to get connection on
> the system from two or more places at one time, like if users share their
> accounts, taking two modems and only paying for one account ?
Sure. Stick a "cron" job in to count the number of times that a user is on
a tty line. Think about something like:
#! /bin/sh -
PATH=/bin:/usr/bin; export PATH
who | grep " ttyd" | sort | uniq -c | (
while read count user; do
if [ ${count} -gt 1 ]; then
kill -HUP `ps agxu | grep "^${user} " | awk '{print $2}'`
fi
done
)
This is of course very simplistic but could be effective if run out of cron,
say, every 5 minutes (excuse any errors, I have NOT tested it, you shouldn't
run it unless you understand what it is doing and can fix my bugs)...
This is simpler than the network/X11 pty case, of course.. ;-)
> My system has limited amount of modems attached, so it would be of good
> appreaciation if I could manage to prevent parallel modem connections for
> one user.
... Joe
-------------------------------------------------------------------------------
Joe Greco - Systems Administrator jgreco@ns.sol.net
Solaria Public Access UNIX - Milwaukee, WI 414/342-4847
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199601031727.LAA13230>