/* $NetBSD: dm.c,v 1.30 2021/05/02 12:50:44 rillig 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 #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 1.30 2021/05/02 12:50:44 rillig Exp $"); #endif #endif /* not lint */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "utmpentry.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? */ 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 __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. */ static int users(void) { struct utmpentry *ep; int nusers; nusers = getutentries(NULL, &ep); 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 */