From 77e3814f0c0e3dea4d0032e25666f77e6f83bfff Mon Sep 17 00:00:00 2001 From: cgd Date: Sun, 21 Mar 1993 09:45:37 +0000 Subject: initial import of 386bsd-0.1 sources --- dm/dm.c | 327 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 327 insertions(+) create mode 100644 dm/dm.c (limited to 'dm/dm.c') 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 +#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 + */ +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 */ -- cgit v1.2.3-56-ge451