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+.\"	$NetBSD: dm.8,v 1.9 2003/08/07 09:37:11 agc Exp $
+.\"
+.\" Copyright (c) 1987, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)dm.8	8.1 (Berkeley) 5/31/93
+.\"
+.Dd May 31, 1993
+.Dt DM 8
+.Os
+.Sh NAME
+.Nm dm
+.Nd dungeon master
+.Sh SYNOPSIS
+.Nm ln
+.Fl s Cm dm Ar game
+.Sh DESCRIPTION
+.Nm
+is a program used to regulate game playing.
+.Nm
+expects to be invoked with the name of a game that a user wishes to play.
+This is done by creating symbolic links to
+.Nm ,
+in the directory
+.Pa /usr/games
+for all of the regulated games.
+The actual binaries for these games should be placed in a
+.Dq hidden
+directory,
+.Pa /usr/games/hide ,
+that may only be accessed by the
+.Nm
+program.
+.Nm
+determines if the requested game is available and, if so, runs it.
+The file
+.Pa /etc/dm.conf
+controls the conditions under which games may be run.
+.Pp
+The file
+.Pa /etc/nogames
+may be used to
+.Dq turn off
+game playing.
+If the file exists, no game playing is allowed; the contents of the file
+will be displayed to any user requesting a game.
+.Sh FILES
+.Bl -tag -width /var/log/games.log -compact
+.It Pa /etc/dm.conf
+configuration file
+.It Pa /etc/nogames
+turns off game playing
+.It Pa /usr/games/hide
+directory of ``real'' binaries
+.It Pa /var/log/games.log
+game logging file
+.El
+.Sh SEE ALSO
+.Xr dm.conf 5
+.Sh HISTORY
+The
+.Nm
+command appeared in
+.Bx 4.3 tahoe .
+.Sh SECURITY CONSIDERATIONS
+Two issues result from
+.Nm
+running the games setgid
+.Dq games .
+First, all games that allow users to run
+.Ux
+commands should carefully
+set both the real and effective group ids immediately before executing
+those commands.
+Probably more important is that
+.Nm
+never be setgid anything but
+.Dq games
+so that compromising a game will result only in
+the user's ability to play games at will.
+Secondly, games which previously had no reason to run setgid and which
+accessed user files may have to be modified.