4.4BSD/usr/src/games/dm/dm.c
/*
* 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.
*/
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1987, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)dm.c 8.1 (Berkeley) 5/31/93";
#endif /* not lint */
#include <sys/param.h>
#include <sys/file.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <ctype.h>
#include <nlist.h>
#include <pwd.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <utmp.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? */
int
main(argc, argv)
int argc;
char *argv[];
{
char *cp;
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];
(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;
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;
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) {
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 */