[unix-history] / usr / othersrc / games / dm / dm.c

/*
 * 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 */
Commit	Line	Data
319262e3 WJ	1	/*
	2	* Copyright (c) 1987 Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*/
	33
	34	#ifndef lint
	35	char copyright[] =
	36	"@(#) Copyright (c) 1987 Regents of the University of California.\n\
	37	All rights reserved.\n";
	38	#endif /* not lint */
	39
	40	#ifndef lint
	41	static char sccsid[] = "@(#)dm.c 5.16 (Berkeley) 2/28/91";
	42	#endif /* not lint */
	43
	44	#include <sys/param.h>
	45	#include <sys/file.h>
	46	#include <sys/time.h>
	47	#include <sys/resource.h>
	48	#include <pwd.h>
	49	#include <utmp.h>
	50	#include <nlist.h>
	51	#include <stdio.h>
	52	#include <ctype.h>
	53	#include "pathnames.h"
	54
	55	extern int errno;
	56	static time_t now; /* current time value */
	57	static int priority = 0; /* priority game runs at */
	58	static char game, / requested game */
	59	gametty; / from tty? */
	60
	61	/ARGSUSED/
	62	main(argc, argv)
	63	int argc;
	64	char **argv;
65	{
66	char cp, rindex(), *ttyname();
67	time_t time();
68
69	nogamefile();
70	game = (cp = rindex(argv, '/')) ? ++cp : argv;
71
72	if (!strcmp(game, "dm"))
73	exit(0);
74
75	gametty = ttyname(0);
76	(void)time(&now);
77	read_config();
78	#ifdef LOG
79	logfile();
80	#endif
81	play(argv);
82	/NOTREACHED/
83	}
84
85	/*
86	* play --
87	* play the game
88	*/
89	play(args)
90	char **args;
91	{
92	char pbuf[MAXPATHLEN], strcpy(), strerror();
93
94	(void)strcpy(pbuf, _PATH_HIDE);
95	(void)strcpy(pbuf + sizeof(_PATH_HIDE) - 1, game);
96	if (priority > 0) /* < 0 requires root */
97	(void)setpriority(PRIO_PROCESS, 0, priority);
98	setgid(getgid()); /* we run setgid kmem; lose it */
99	execv(pbuf, args);
100	(void)fprintf(stderr, "dm: %s: %s\n", pbuf, strerror(errno));
101	exit(1);
102	}
103
104	/*
105	* read_config --
106	* read through config file, looking for key words.
107	*/
108	read_config()
109	{
110	FILE *cfp;
111	char lbuf[BUFSIZ], f1[40], f2[40], f3[40], f4[40], f5[40];
112
113	if (!(cfp = fopen(_PATH_CONFIG, "r")))
114	return;
115	while (fgets(lbuf, sizeof(lbuf), cfp))
116	switch(*lbuf) {
117	case 'b': /* badtty */
118	if (sscanf(lbuf, "%s%s", f1, f2) != 2 \|\|
119	strcasecmp(f1, "badtty"))
120	break;
121	c_tty(f2);
122	break;
123	case 'g': /* game */
124	if (sscanf(lbuf, "%s%s%s%s%s",
125	f1, f2, f3, f4, f5) != 5 \|\| strcasecmp(f1, "game"))
126	break;
127	c_game(f2, f3, f4, f5);
128	break;
129	case 't': /* time */
130	if (sscanf(lbuf, "%s%s%s%s", f1, f2, f3, f4) != 4 \|\|
131	strcasecmp(f1, "time"))
132	break;
133	c_day(f2, f3, f4);
134	}
135	(void)fclose(cfp);
136	}
137
138	/*
139	* c_day --
140	* if day is today, see if okay to play
141	*/
142	c_day(s_day, s_start, s_stop)
143	char s_day, s_start, *s_stop;
144	{
145	static char *days[] = {
146	"sunday", "monday", "tuesday", "wednesday",
147	"thursday", "friday", "saturday",
148	};
149	static struct tm *ct;
150	int start, stop;
151
152	if (!ct)
153	ct = localtime(&now);
154	if (strcasecmp(s_day, days[ct->tm_wday]))
155	return;
156	if (!isdigit(s_start) \|\| !isdigit(s_stop))
157	return;
158	start = atoi(s_start);
159	stop = atoi(s_stop);
160	if (ct->tm_hour >= start && ct->tm_hour < stop) {
161	fputs("dm: Sorry, games are not available from ", stderr);
162	hour(start);
163	fputs(" to ", stderr);
164	hour(stop);
165	fputs(" today.\n", stderr);
166	exit(0);
167	}
168	}
169
170	/*
171	* c_tty --
172	* decide if this tty can be used for games.
173	*/
174	c_tty(tty)
175	char *tty;
176	{
177	static int first = 1;
178	static char *p_tty;
179	char *rindex();
180
181	if (first) {
182	p_tty = rindex(gametty, '/');
183	first = 0;
184	}
185
186	if (!strcmp(gametty, tty) \|\| p_tty && !strcmp(p_tty, tty)) {
187	fprintf(stderr, "dm: Sorry, you may not play games on %s.\n", gametty);
188	exit(0);
189	}
190	}
191
192	/*
193	* c_game --
194	* see if game can be played now.
195	*/
196	c_game(s_game, s_load, s_users, s_priority)
197	char s_game, s_load, s_users, s_priority;
198	{
199	static int found;
200	double load();
201
202	if (found)
203	return;
204	if (strcmp(game, s_game) && strcasecmp("default", s_game))
205	return;
206	++found;
207	if (isdigit(*s_load) && atoi(s_load) < load()) {
208	fputs("dm: Sorry, the load average is too high right now.\n", stderr);
209	exit(0);
210	}
211	if (isdigit(*s_users) && atoi(s_users) <= users()) {
212	fputs("dm: Sorry, there are too many users logged on right now.\n", stderr);
213	exit(0);
214	}
215	if (isdigit(*s_priority))
216	priority = atoi(s_priority);
217	}
218
219	/*
220	* load --
221	* return 15 minute load average
222	*/
223	double
224	load()
225	{
226	double avenrun[3];
227
228	if (getloadavg(avenrun, sizeof(avenrun)/sizeof(avenrun[0])) < 0) {
229	fputs("dm: getloadavg() failed.\n", stderr);
230	exit(1);
231	}
232	return(avenrun[2]);
233	}
234
235	/*
236	* users --
237	* return current number of users
238	* todo: check idle time; if idle more than X minutes, don't
239	* count them.
240	*/
241	users()
242	{
243
244	register int nusers, utmp;
245	struct utmp buf;
246
247	if ((utmp = open(_PATH_UTMP, O_RDONLY, 0)) < 0) {
248	(void)fprintf(stderr, "dm: %s: %s\n",
249	_PATH_UTMP, strerror(errno));
250	exit(1);
251	}
252	for (nusers = 0; read(utmp, (char *)&buf, sizeof(struct utmp)) > 0;)
253	if (buf.ut_name[0] != '\0')
254	++nusers;
255	return(nusers);
256	}
257
258	nogamefile()
259	{
260	register int fd, n;
261	char buf[BUFSIZ];
262
263	if ((fd = open(_PATH_NOGAMES, O_RDONLY, 0)) >= 0) {
264	#define MESG "Sorry, no games right now.\n\n"
265	(void)write(2, MESG, sizeof(MESG) - 1);
266	while ((n = read(fd, buf, sizeof(buf))) > 0)
267	(void)write(2, buf, n);
268	exit(1);
269	}
270	}
271
272	/*
273	* hour --
274	* print out the hour in human form
275	*/
276	hour(h)
277	int h;
278	{
279	switch(h) {
280	case 0:
281	fputs("midnight", stderr);
282	break;
283	case 12:
284	fputs("noon", stderr);
285	break;
286	default:
287	if (h > 12)
288	fprintf(stderr, "%dpm", h - 12);
289	else
290	fprintf(stderr, "%dam", h);
291	}
292	}
293
294	#ifdef LOG
295	/*
296	* logfile --
297	* log play of game
298	*/
299	logfile()
300	{
301	struct passwd pw, getpwuid();
302	FILE *lp;
303	uid_t uid;
304	int lock_cnt;
305	char *ctime();
306
307	if (lp = fopen(_PATH_LOG, "a")) {
308	for (lock_cnt = 0;; ++lock_cnt) {
309	if (!flock(fileno(lp), LOCK_EX))
310	break;
311	if (lock_cnt == 4) {
312	perror("dm: log lock");
313	(void)fclose(lp);
314	return;
315	}
316	sleep((u_int)1);
317	}
318	if (pw = getpwuid(uid = getuid()))
319	fputs(pw->pw_name, lp);
320	else
321	fprintf(lp, "%u", uid);
322	fprintf(lp, "\t%s\t%s\t%s", game, gametty, ctime(&now));
323	(void)fclose(lp);
324	(void)flock(fileno(lp), LOCK_UN);
325	}
326	}
327	#endif /* LOG */