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11
dm/Makefile.bsd Normal file
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# $NetBSD: Makefile,v 1.8 1997/11/19 08:23:37 mrg Exp $
# @(#)Makefile 8.1 (Berkeley) 5/31/93
# -DLOG log games
PROG= dm
MAN= dm.8 dm.conf.5
# shouldn't be necessary; just in case.
BINGRP= games
BINMODE=2555
.include <bsd.prog.mk>

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dm/Makefrag Normal file
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# Makefrag - makefile fragment for dm
# Add -DLOG if you want logging
dm_DEFS := # -DLOG
dm_DIRS := $(GAMESDIR) $(MAN8DIR) $(MAN5DIR)
dm_all: dm/dm dm/dm.8 dm/dm.conf.5
dm_install: dm_all
$(INSTALL_DM) dm/dm $(INSTALL_PREFIX)$(GAMESDIR)/dm
$(INSTALL_MANUAL) dm/dm.8
$(INSTALL_MANUAL) dm/dm.conf.5

13
dm/README.linux Normal file
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1997-08-07
Dm is the `dungeon master', a program that allows you to control when
users can play games. (Note that this does not control any private
copies of games they may have). I do not claim that this program is
actually useful, but it is included in bsd-games since it is in
NetBSD.
Add -DLOG to the DEFS in the Makefile if you want logging of games
playing.
Joseph S. Myers
jsm28@cam.ac.uk

111
dm/dm.8.in Normal file
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.\" $NetBSD: dm.8,v 1.6 1998/06/08 12:41:41 lukem 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. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 4. 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 @gamesdir@
for all of the regulated games.
The actual binaries for these games should be placed in a
.Dq hidden
directory,
.Pa @libexecdir@ ,
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 @dm_configfile@
controls the conditions under which games may
be run.
.Pp
The file
.Pa @dm_nogamesfile@
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 @dm_logfile@ -compact
.It Pa @dm_configfile@
configuration file
.It Pa @dm_nogamesfile@
turns off game playing
.It Pa @libexecdir@
directory of ``real'' binaries
.It Pa @dm_logfile@
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 id's 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.

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/* $NetBSD: dm.c,v 1.11 1998/09/13 15:27:27 hubertf Exp $ */
/*
* Copyright (c) 1987, 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1987, 1993\n\
The Regents of the University of California. All rights reserved.\n");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)dm.c 8.1 (Berkeley) 5/31/93";
#else
__RCSID("$NetBSD: dm.c,v 1.11 1998/09/13 15:27:27 hubertf Exp $");
#endif
#endif /* not lint */
#include <sys/param.h>
#include <sys/file.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <err.h>
#include <ctype.h>
#include <errno.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <utmp.h>
#include "pathnames.h"
static time_t now; /* current time value */
static int priority = 0; /* priority game runs at */
static char *game, /* requested game */
*gametty; /* from tty? */
void c_day __P((const char *, const char *, const char *));
void c_game __P((const char *, const char *, const char *, const char *));
void c_tty __P((const char *));
const char *hour __P((int));
double load __P((void));
int main __P((int, char *[]));
void nogamefile __P((void));
void play __P((char **)) __attribute__((__noreturn__));
void read_config __P((void));
int users __P((void));
int
main(argc, argv)
int argc __attribute__((unused));
char *argv[];
{
char *cp;
nogamefile();
game = (cp = strrchr(*argv, '/')) ? ++cp : *argv;
if (!strcmp(game, "dm"))
exit(0);
gametty = ttyname(0);
unsetenv("TZ");
(void)time(&now);
read_config();
#ifdef LOG
logfile();
#endif
play(argv);
/*NOTREACHED*/
return (0);
}
/*
* play --
* play the game
*/
void
play(args)
char **args;
{
char pbuf[MAXPATHLEN];
(void)strncpy(pbuf, _PATH_HIDE, sizeof(pbuf) - 1);
(void)strncpy(pbuf + sizeof(_PATH_HIDE) - 1, game,
sizeof(pbuf) - sizeof(_PATH_HIDE) - 1);
pbuf[sizeof(pbuf) - 1] = '\0';
if (priority > 0) /* < 0 requires root */
(void)setpriority(PRIO_PROCESS, 0, priority);
execv(pbuf, args);
err(1, "%s", pbuf);
}
/*
* read_config --
* read through config file, looking for key words.
*/
void
read_config()
{
FILE *cfp;
char lbuf[BUFSIZ], f1[40], f2[40], f3[40], f4[40], f5[40];
if (!(cfp = fopen(_PATH_CONFIG, "r")))
return;
while (fgets(lbuf, sizeof(lbuf), cfp))
switch (*lbuf) {
case 'b': /* badtty */
if (sscanf(lbuf, "%s%s", f1, f2) != 2 ||
strcasecmp(f1, "badtty"))
break;
c_tty(f2);
break;
case 'g': /* game */
if (sscanf(lbuf, "%s%s%s%s%s",
f1, f2, f3, f4, f5) != 5 || strcasecmp(f1, "game"))
break;
c_game(f2, f3, f4, f5);
break;
case 't': /* time */
if (sscanf(lbuf, "%s%s%s%s", f1, f2, f3, f4) != 4 ||
strcasecmp(f1, "time"))
break;
c_day(f2, f3, f4);
}
(void)fclose(cfp);
}
/*
* c_day --
* if day is today, see if okay to play
*/
void
c_day(s_day, s_start, s_stop)
const char *s_day, *s_start, *s_stop;
{
static const char *const days[] = {
"sunday", "monday", "tuesday", "wednesday",
"thursday", "friday", "saturday",
};
static struct tm *ct;
int start, stop;
if (!ct)
ct = localtime(&now);
if (strcasecmp(s_day, days[ct->tm_wday]))
return;
if (!isdigit(*s_start) || !isdigit(*s_stop))
return;
start = atoi(s_start);
stop = atoi(s_stop);
if (ct->tm_hour >= start && ct->tm_hour < stop) {
if (start == 0 && stop == 24)
errx(0, "Sorry, games are not available today.");
else
errx(0, "Sorry, games are not available from %s to %s today.",
hour(start), hour(stop));
}
}
/*
* c_tty --
* decide if this tty can be used for games.
*/
void
c_tty(tty)
const char *tty;
{
static int first = 1;
static char *p_tty;
if (first) {
p_tty = strrchr(gametty, '/');
first = 0;
}
if (!strcmp(gametty, tty) || (p_tty && !strcmp(p_tty, tty)))
errx(1, "Sorry, you may not play games on %s.", gametty);
}
/*
* c_game --
* see if game can be played now.
*/
void
c_game(s_game, s_load, s_users, s_priority)
const char *s_game, *s_load, *s_users, *s_priority;
{
static int found;
if (found)
return;
if (strcmp(game, s_game) && strcasecmp("default", s_game))
return;
++found;
if (isdigit(*s_load) && atoi(s_load) < load())
errx(0, "Sorry, the load average is too high right now.");
if (isdigit(*s_users) && atoi(s_users) <= users())
errx(0, "Sorry, there are too many users logged on right now.");
if (isdigit(*s_priority))
priority = atoi(s_priority);
}
/*
* load --
* return 15 minute load average
*/
double
load()
{
double avenrun[3];
if (getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0])) < 0)
err(1, "getloadavg() failed");
return (avenrun[2]);
}
/*
* users --
* return current number of users
* todo: check idle time; if idle more than X minutes, don't
* count them.
*/
int
users()
{
int nusers, utmp;
struct utmp buf;
if ((utmp = open(_PATH_UTMP, O_RDONLY, 0)) < 0)
err(1, "%s", _PATH_UTMP);
for (nusers = 0; read(utmp, (char *)&buf, sizeof(struct utmp)) > 0;)
if (buf.ut_name[0] != '\0')
++nusers;
return (nusers);
}
void
nogamefile()
{
int fd, n;
char buf[BUFSIZ];
if ((fd = open(_PATH_NOGAMES, O_RDONLY, 0)) >= 0) {
#define MESG "Sorry, no games right now.\n\n"
(void)write(2, MESG, sizeof(MESG) - 1);
while ((n = read(fd, buf, sizeof(buf))) > 0)
(void)write(2, buf, n);
exit(1);
}
}
/*
* hour --
* print out the hour in human form
*/
const char *
hour(h)
int h;
{
static const char *const hours[] = {
"midnight", "1am", "2am", "3am", "4am", "5am",
"6am", "7am", "8am", "9am", "10am", "11am",
"noon", "1pm", "2pm", "3pm", "4pm", "5pm",
"6pm", "7pm", "8pm", "9pm", "10pm", "11pm", "midnight" };
if (h < 0 || h > 24)
return ("BAD TIME");
else
return (hours[h]);
}
#ifdef LOG
/*
* logfile --
* log play of game
*/
logfile()
{
struct passwd *pw;
FILE *lp;
uid_t uid;
int lock_cnt;
if (lp = fopen(_PATH_LOG, "a")) {
for (lock_cnt = 0;; ++lock_cnt) {
if (!flock(fileno(lp), LOCK_EX))
break;
if (lock_cnt == 4) {
warnx("log lock");
(void)fclose(lp);
return;
}
sleep((u_int)1);
}
if (pw = getpwuid(uid = getuid()))
fputs(pw->pw_name, lp);
else
fprintf(lp, "%u", uid);
fprintf(lp, "\t%s\t%s\t%s", game, gametty, ctime(&now));
(void)fclose(lp);
(void)flock(fileno(lp), LOCK_UN);
}
}
#endif /* LOG */

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.\" $NetBSD: dm.conf.5,v 1.5 1998/04/29 18:16:01 fair Exp $
.\"
.\" Copyright (c) 1988, 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. All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" This product includes software developed by the University of
.\" California, Berkeley and its contributors.
.\" 4. 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.conf.5 8.1 (Berkeley) 5/31/93
.\"
.Dd May 31, 1993
.Dt DM.CONF 5
.Os BSD 4.2
.Sh NAME
.Nm dm.conf
.Nd dungeon master configuration file
.Sh DESCRIPTION
The
.Nm
file is the configuration file for the
.Xr dm 8
program.
It consists of lines beginning with one of three keywords,
.Em badtty ,
.Em game ,
and
.Em time .
All other lines are ignored.
.Pp
Any tty listed after the keyword
.Em badtty
may not have games played on it.
Entries consist of two white-space separated fields: the string
.Em badtty
and the ttyname as returned by
.Xr ttyname 3 .
For example,
to keep the uucp dialout,
.Dq tty19 ,
from being used for games, the entry would be:
.Bd -literal -offset indent
badtty /dev/tty19
.Ed
.Pp
Any day/hour combination listed after the keyword
.Em time
will disallow games during those hours.
Entries consist of four white-space separated fields: the string
.Em time ,
the unabbreviated day of the week and the beginning and ending time
of a period of the day when games may not be played.
The time fields are in a 0 based, 24-hour clock.
For example, the following entry allows games playing before 8AM
and after 5PM on Mondays:
.Bd -literal -offset indent
time Monday 8 17
.Ed
.Pp
Any game listed after the keyword
.Em game
will set parameters for a specific game.
Entries consist of five white-space separated fields: the keyword
.Em game ,
the name of a game, the highest system load average at which the
game may be played, the maximum users allowed if the game is to be
played, and the priority at which the game is to be run.
Any of these fields may start with a non-numeric character, resulting
in no game limitation or priority based on that field.
.Pp
The game
.Em default
controls the settings for
any game not otherwise listed, and must be the last
.Em game
entry in the file.
Priorities may not be negative.
For example, the following entries
limits the game
.Dq hack
to running only when the system has 10 or less
users and a load average of 5 or less; all other games may be run any time
the system has 15 or less users.
.Bd -literal -offset indent
game hack 5 10 *
game default * 15 *
.Ed
.Sh FILES
.Bl -tag -width @dm_configfile@ -compact
.It Pa @dm_configfile@
The
.Xr dm 8
configuration file.
.El
.Sh SEE ALSO
.Xr setpriority 2 ,
.Xr ttyname 3 ,
.Xr dm 8

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/* $NetBSD: pathnames.h,v 1.3 1995/03/21 15:09:08 cgd Exp $ */
/*
* Copyright (c) 1989, 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*
* @(#)pathnames.h 8.1 (Berkeley) 5/31/93
*/
#define _PATH_CONFIG "@dm_configfile@"
#define _PATH_HIDE "@libexecdir@/"
#undef _PATH_LOG
#define _PATH_LOG "@dm_logfile@"
#define _PATH_NOGAMES "@dm_nogamesfile@"