initial import of 386bsd-0.1 sources

1 files changed, 327 insertions, 0 deletions

diff --git a/dm/dm.c b/dm/dm.c
new file mode 100644
index 00000000..bf820688
--- /dev/null
+++ b/dm/dm.c
@@ -0,0 +1,327 @@
+/*
+ * Copyright (c) 1987 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.
+ */
+
+#ifndef lint
+char copyright[] =
+"@(#) Copyright (c) 1987 Regents of the University of California.\n\
+ All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)dm.c	5.16 (Berkeley) 2/28/91";
+#endif /* not lint */
+
+#include <sys/param.h>
+#include <sys/file.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <pwd.h>
+#include <utmp.h>
+#include <nlist.h>
+#include <stdio.h>
+#include <ctype.h>
+#include "pathnames.h"
+
+extern int errno;
+static time_t	now;			/* current time value */
+static int	priority = 0;		/* priority game runs at */
+static char	*game,			/* requested game */
+		*gametty;		/* from tty? */
+
+/*ARGSUSED*/
+main(argc, argv)
+	int argc;
+	char **argv;
+{
+	char *cp, *rindex(), *ttyname();
+	time_t time();
+
+	nogamefile();
+	game = (cp = rindex(*argv, '/')) ? ++cp : *argv;
+
+	if (!strcmp(game, "dm"))
+		exit(0);
+
+	gametty = ttyname(0);
+	(void)time(&now);
+	read_config();
+#ifdef LOG
+	logfile();
+#endif
+	play(argv);
+	/*NOTREACHED*/
+}
+
+/*
+ * play --
+ *	play the game
+ */
+play(args)
+	char **args;
+{
+	char pbuf[MAXPATHLEN], *strcpy(), *strerror();
+
+	(void)strcpy(pbuf, _PATH_HIDE);
+	(void)strcpy(pbuf + sizeof(_PATH_HIDE) - 1, game);
+	if (priority > 0)	/* < 0 requires root */
+		(void)setpriority(PRIO_PROCESS, 0, priority);
+	setgid(getgid());	/* we run setgid kmem; lose it */
+	execv(pbuf, args);
+	(void)fprintf(stderr, "dm: %s: %s\n", pbuf, strerror(errno));
+	exit(1);
+}
+
+/*
+ * read_config --
+ *	read through config file, looking for key words.
+ */
+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
+ */
+c_day(s_day, s_start, s_stop)
+	char *s_day, *s_start, *s_stop;
+{
+	static char *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) {
+		fputs("dm: Sorry, games are not available from ", stderr);
+		hour(start);
+		fputs(" to ", stderr);
+		hour(stop);
+		fputs(" today.\n", stderr);
+		exit(0);
+	}
+}
+
+/*
+ * c_tty --
+ *	decide if this tty can be used for games.
+ */
+c_tty(tty)
+	char *tty;
+{
+	static int first = 1;
+	static char *p_tty;
+	char *rindex();
+
+	if (first) {
+		p_tty = rindex(gametty, '/');
+		first = 0;
+	}
+
+	if (!strcmp(gametty, tty) || p_tty && !strcmp(p_tty, tty)) {
+		fprintf(stderr, "dm: Sorry, you may not play games on %s.\n", gametty);
+		exit(0);
+	}
+}
+
+/*
+ * c_game --
+ *	see if game can be played now.
+ */
+c_game(s_game, s_load, s_users, s_priority)
+	char *s_game, *s_load, *s_users, *s_priority;
+{
+	static int found;
+	double load();
+
+	if (found)
+		return;
+	if (strcmp(game, s_game) && strcasecmp("default", s_game))
+		return;
+	++found;
+	if (isdigit(*s_load) && atoi(s_load) < load()) {
+		fputs("dm: Sorry, the load average is too high right now.\n", stderr);
+		exit(0);
+	}
+	if (isdigit(*s_users) && atoi(s_users) <= users()) {
+		fputs("dm: Sorry, there are too many users logged on right now.\n", stderr);
+		exit(0);
+	}
+	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) {
+		fputs("dm: getloadavg() failed.\n", stderr);
+		exit(1);
+	}
+	return(avenrun[2]);
+}
+
+/*
+ * users --
+ *	return current number of users
+ *	todo: check idle time; if idle more than X minutes, don't
+ *	count them.
+ */
+users()
+{
+	
+	register int nusers, utmp;
+	struct utmp buf;
+
+	if ((utmp = open(_PATH_UTMP, O_RDONLY, 0)) < 0) {
+		(void)fprintf(stderr, "dm: %s: %s\n",
+		    _PATH_UTMP, strerror(errno));
+		exit(1);
+	}
+	for (nusers = 0; read(utmp, (char *)&buf, sizeof(struct utmp)) > 0;)
+		if (buf.ut_name[0] != '\0')
+			++nusers;
+	return(nusers);
+}
+
+nogamefile()
+{
+	register 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
+ */
+hour(h)
+	int h;
+{
+	switch(h) {
+	case 0:
+		fputs("midnight", stderr);
+		break;
+	case 12:
+		fputs("noon", stderr);
+		break;
+	default:
+		if (h > 12)
+			fprintf(stderr, "%dpm", h - 12);
+		else
+			fprintf(stderr, "%dam", h);
+	}
+}
+
+#ifdef LOG
+/*
+ * logfile --
+ *	log play of game
+ */
+logfile()
+{
+	struct passwd *pw, *getpwuid();
+	FILE *lp;
+	uid_t uid;
+	int lock_cnt;
+	char *ctime();
+
+	if (lp = fopen(_PATH_LOG, "a")) {
+		for (lock_cnt = 0;; ++lock_cnt) {
+			if (!flock(fileno(lp), LOCK_EX))
+				break;
+			if (lock_cnt == 4) {
+				perror("dm: 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 */