1.\" Copyright (c) 1987, 1991 Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" %sccs.include.redist.man% 5.\" 6.\" @(#)dm.8 5.11 (Berkeley) 07/23/91 7.\" 8.Dd 9.Dt DM 8 10.Os 11.Sh NAME 12.Nm dm 13.Nd dungeon master 14.Sh SYNOPSIS 15.Nm ln 16.Fl s Cm dm Ar game 17.Sh DESCRIPTION 18.Nm Dm 19is a program used to regulate game playing. 20.Nm Dm 21expects to be invoked with the name of a game that a user wishes to play. 22This is done by creating symbolic links to 23.Nm dm , 24in the directory 25.Pa /usr/games 26for all of the regulated games. 27The actual binaries for these games should be placed in a 28.Dq hidden 29directory, 30.Pa /usr/games/hide , 31that may only be accessed by the 32.Nm dm 33program. 34.Nm Dm 35determines if the requested game is available and, if so, runs it. 36The file 37.Pa /etc/dm.conf 38controls the conditions under which games may 39be run. 40.Pp 41The file 42.Pa /etc/nogames 43may be used to 44.Dq turn off 45game playing. 46If the file exists, no game playing is allowed; the contents of the file 47will be displayed to any user requesting a game. 48.Sh FILES 49.Bl -tag -width /var/log/games.log -compact 50.It Pa /etc/dm.conf 51configuration file 52.It Pa /etc/nogames 53turns off game playing 54.It Pa /usr/games/hide 55directory of ``real'' binaries 56.It Pa /var/log/games.log 57game logging file 58.El 59.Sh SEE ALSO 60.Xr dm.conf 5 61.Sh BUGS 62Two problems result from 63.Nm dm 64running the games setuid 65.Dq games . 66First, all games that allow users to run 67.Tn UNIX 68commands should carefully 69set both the real and effective user id's immediately before executing 70those commands. Probably more important is that 71.Nm dm 72never be setuid 73anything but 74.Dq games 75so that compromising a game will result only in 76the user's ability to play games at will. Secondly, games which previously 77had no reason to run setuid and which accessed user files may have to 78be modified. 79.Sh HISTORY 80The 81.Nm dm 82command appeared in 83.Bx 4.3 tahoe . 84