/* * Copyright (c) 1987 Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms are permitted * provided that the above copyright notice and this paragraph are * duplicated in all such forms and that any documentation, * advertising materials, and other materials related to such * distribution and use acknowledge that the software was developed * by the University of California, Berkeley. The name of the * University may not be used to endorse or promote products derived * from this software without specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ #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 5.14 (Berkeley) 05/01/90"; #endif /* not lint */ #include #include #include #include #include #include #include #include #include #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 */ static 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. */ static 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 */ static 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. */ static 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. */ static 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 */ static 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. */ static 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); } static 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 */ static 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 */ static 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 */