initial commit

5 files changed, 610 insertions, 0 deletions

diff --git a/dm/Makefile b/dm/Makefile
new file mode 100644
index 0000000..7514eb8
--- /dev/null
+++ b/dm/Makefile
@@ -0,0 +1,18 @@
+#	$NetBSD: Makefile,v 1.11 2002/09/18 03:23:00 lukem Exp $
+#	@(#)Makefile	8.1 (Berkeley) 5/31/93
+
+.include <bsd.own.mk>
+
+# -DLOG		log games
+PROG=	dm
+# 20150209 bkw: removed utmpentry.c reference
+SRCS=	dm.c
+MAN=	dm.8 dm.conf.5
+# shouldn't be necessary; just in case.
+BINGRP= games
+BINMODE=2555
+
+.PATH.c: ${NETBSDSRCDIR}/usr.bin/who
+CPPFLAGS+=-I${NETBSDSRCDIR}/usr.bin/who -DSUPPORT_UTMPX -DSUPPORT_UTMP
+
+.include <bsd.prog.mk>
diff --git a/dm/dm.8 b/dm/dm.8
new file mode 100644
index 0000000..a30ec11
--- /dev/null
+++ b/dm/dm.8
@@ -0,0 +1,106 @@
+.\"	$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.
diff --git a/dm/dm.c b/dm/dm.c
new file mode 100644
index 0000000..737be8b
--- /dev/null
+++ b/dm/dm.c
@@ -0,0 +1,335 @@
+/*	$NetBSD: dm.c,v 1.29 2009/08/27 00:22:28 dholland 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. 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\
+ The Regents of the University of California.  All rights reserved.");
+#endif /* not lint */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)dm.c	8.1 (Berkeley) 5/31/93";
+#else
+__RCSID("$NetBSD: dm.c,v 1.29 2009/08/27 00:22:28 dholland 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> /* 20150209 bkw: see users() */
+#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? */
+
+static void c_day(const char *, const char *, const char *);
+static void c_game(const char *, const char  *, const char *, const char *);
+static void c_tty(const char *);
+static const char *hour(int);
+static double load(void);
+static void nogamefile(void);
+static void play(char **) __dead;
+static void read_config(void);
+static int users(void);
+
+#ifdef LOG
+static void logfile(void);
+#endif
+
+int
+main(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
+ */
+static void
+play(char **args)
+{
+	char pbuf[MAXPATHLEN];
+
+	snprintf(pbuf, sizeof(pbuf), "%s%s", _PATH_HIDE, game);
+	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.
+ */
+static void
+read_config(void)
+{
+	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, "%39s%39s", f1, f2) != 2 ||
+			    strcasecmp(f1, "badtty"))
+				break;
+			c_tty(f2);
+			break;
+		case 'g':		/* game */
+			if (sscanf(lbuf, "%39s%39s%39s%39s%39s",
+			    f1, f2, f3, f4, f5) != 5 || strcasecmp(f1, "game"))
+				break;
+			c_game(f2, f3, f4, f5);
+			break;
+		case 't':		/* time */
+			if (sscanf(lbuf, "%39s%39s%39s%39s", 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
+ */
+static void
+c_day(const char *s_day, const char *s_start, const char *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((unsigned char)*s_start) || 
+	    !isdigit((unsigned char)*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.
+ */
+static void
+c_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.
+ */
+static void
+c_game(const char *s_game, const char *s_load, const char *s_users, 
+       const char *s_priority)
+{
+	static int found;
+
+	if (found)
+		return;
+	if (strcmp(game, s_game) && strcasecmp("default", s_game))
+		return;
+	++found;
+	if (isdigit((unsigned char)*s_load) && atoi(s_load) < load())
+		errx(0, "Sorry, the load average is too high right now.");
+	if (isdigit((unsigned char)*s_users) && atoi(s_users) <= users())
+		errx(0, "Sorry, there are too many users logged on right now.");
+	if (isdigit((unsigned char)*s_priority))
+		priority = atoi(s_priority);
+}
+
+/*
+ * load --
+ *	return 15 minute load average
+ */
+static double
+load(void)
+{
+	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.
+ * 20150209 bkw: replaced BSD original with dm.c users() from
+ * Linux port of bsd-games-2.13
+ */
+static 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);
+}
+
+static void
+nogamefile(void)
+{
+	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
+ */
+static const char *
+hour(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
+ */
+static void
+logfile(void)
+{
+	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(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)flock(fileno(lp), LOCK_UN);
+		(void)fclose(lp);
+	}
+}
+#endif /* LOG */
diff --git a/dm/dm.conf.5 b/dm/dm.conf.5
new file mode 100644
index 0000000..b7933ce
--- /dev/null
+++ b/dm/dm.conf.5
@@ -0,0 +1,114 @@
+.\"	$NetBSD: dm.conf.5,v 1.8 2003/08/07 09:37:11 agc 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. 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
+.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 /etc/dm.conf -compact
+.It Pa /etc/dm.conf
+The
+.Xr dm 8
+configuration file.
+.El
+.Sh SEE ALSO
+.Xr setpriority 2 ,
+.Xr ttyname 3 ,
+.Xr dm 8
diff --git a/dm/pathnames.h b/dm/pathnames.h
new file mode 100644
index 0000000..9acdc5c
--- /dev/null
+++ b/dm/pathnames.h
@@ -0,0 +1,37 @@
+/*	$NetBSD: pathnames.h,v 1.4 2003/08/07 09:37:12 agc 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. 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	"/etc/dm.conf"
+#define	_PATH_HIDE	"/usr/games/hide/"
+#define	_PATH_LOG	"/var/log/games.log"
+#define	_PATH_NOGAMES	"/etc/nogames"