Home | History | Annotate | Line # | Download | only in shutdown
shutdown.c revision 1.25 
      1 /*	$NetBSD: shutdown.c,v 1.25 1998/03/23 05:00:16 fair Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1988, 1990, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 __COPYRIGHT("@(#) Copyright (c) 1988, 1990, 1993\n\
     39 	The Regents of the University of California.  All rights reserved.\n");
     40 #endif /* not lint */
     41 
     42 #ifndef lint
     43 #if 0
     44 static char sccsid[] = "@(#)shutdown.c	8.4 (Berkeley) 4/28/95";
     45 #else
     46 __RCSID("$NetBSD: shutdown.c,v 1.25 1998/03/23 05:00:16 fair Exp $");
     47 #endif
     48 #endif /* not lint */
     49 
     50 #include <sys/param.h>
     51 #include <sys/time.h>
     52 #include <sys/resource.h>
     53 #include <sys/syslog.h>
     54 
     55 #include <ctype.h>
     56 #include <err.h>
     57 #include <fcntl.h>
     58 #include <pwd.h>
     59 #include <setjmp.h>
     60 #include <signal.h>
     61 #include <stdio.h>
     62 #include <stdlib.h>
     63 #include <string.h>
     64 #include <tzfile.h>
     65 #include <unistd.h>
     66 
     67 #include "pathnames.h"
     68 
     69 #ifdef DEBUG
     70 #undef _PATH_NOLOGIN
     71 #define	_PATH_NOLOGIN	"./nologin"
     72 #undef _PATH_FASTBOOT
     73 #define	_PATH_FASTBOOT	"./fastboot"
     74 #endif
     75 
     76 #define	H		*60*60
     77 #define	M		*60
     78 #define	S		*1
     79 #define	NOLOG_TIME	5*60
     80 struct interval {
     81 	int timeleft, timetowait;
     82 } tlist[] = {
     83 	{ 10 H,  5 H },	{  5 H,  3 H },	{  2 H,  1 H },	{ 1 H, 30 M },
     84 	{ 30 M, 10 M },	{ 20 M, 10 M },	{ 10 M,  5 M },	{ 5 M,  3 M },
     85 	{  2 M,  1 M },	{  1 M, 30 S },	{ 30 S, 30 S },
     86 	{  0, 0 }
     87 };
     88 #undef H
     89 #undef M
     90 #undef S
     91 
     92 static time_t offset, shuttime;
     93 static int dofast, dohalt, doreboot, killflg, mbuflen, nofork, nosync, dodump;
     94 static char *whom, mbuf[BUFSIZ];
     95 
     96 void badtime __P((void));
     97 void die_you_gravy_sucking_pig_dog __P((void));
     98 void doitfast __P((void));
     99 void finish __P((int));
    100 void getoffset __P((char *));
    101 void loop __P((void));
    102 int main __P((int, char *[]));
    103 void nolog __P((void));
    104 void timeout __P((int));
    105 void timewarn __P((int));
    106 void usage __P((void));
    107 
    108 int
    109 main(argc, argv)
    110 	int argc;
    111 	char *argv[];
    112 {
    113 	char *p, *endp;
    114 	struct passwd *pw;
    115 	int arglen, ch, len;
    116 
    117 #ifndef DEBUG
    118 	if (geteuid())
    119 		errx(1, "NOT super-user");
    120 #endif
    121 	while ((ch = getopt(argc, argv, "Ddfhknr")) != -1)
    122 		switch (ch) {
    123 		case 'd':
    124 			dodump = 1;
    125 			break;
    126 		case 'D':
    127 			nofork = 1;
    128 			break;
    129 		case 'f':
    130 			dofast = 1;
    131 			break;
    132 		case 'h':
    133 			dohalt = 1;
    134 			break;
    135 		case 'k':
    136 			killflg = 1;
    137 			break;
    138 		case 'n':
    139 			nosync = 1;
    140 			break;
    141 		case 'r':
    142 			doreboot = 1;
    143 			break;
    144 		case '?':
    145 		default:
    146 			usage();
    147 		}
    148 	argc -= optind;
    149 	argv += optind;
    150 
    151 	if (argc < 1)
    152 		usage();
    153 
    154 	if (dodump && !dohalt && !doreboot)
    155 		doreboot = 1;
    156 
    157 	if (dofast && nosync) {
    158 		warnx("incompatible switches -f and -n");
    159 		usage();
    160 	}
    161 	if (dohalt && doreboot) {
    162 		warnx("incompatible switches -h and -r");
    163 		usage();
    164 	}
    165 
    166 	getoffset(*argv++);
    167 
    168 	if (argv[0])
    169 		if (strcmp(argv[0], "-") || argv[1]) {
    170 			for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
    171 				arglen = strlen(*argv);
    172 				if ((len -= arglen) <= 2)
    173 					break;
    174 				if (p != mbuf)
    175 					*p++ = ' ';
    176 				memmove(p, *argv, arglen);
    177 				p += arglen;
    178 			}
    179 			*p = '\n';
    180 			*++p = '\0';
    181 		} else {
    182 			p = mbuf;
    183 			endp = mbuf + sizeof(mbuf) - 2;
    184 			for (;;) {
    185 				if (!fgets(p, endp - p + 1, stdin))
    186 					break;
    187 				for (; *p &&  p < endp; ++p);
    188 				if (p == endp) {
    189 					*p = '\n';
    190 					*++p = '\0';
    191 					break;
    192 				}
    193 			}
    194 		}
    195 	mbuflen = strlen(mbuf);
    196 
    197 	if (offset)
    198 		(void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
    199 	else
    200 		(void)printf("Shutdown NOW!\n");
    201 
    202 	if (!(whom = getlogin()))
    203 		whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
    204 
    205 #ifdef DEBUG
    206 	(void)putc('\n', stdout);
    207 #else
    208 	(void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
    209 	if (nofork == 0) {
    210 		int forkpid;
    211 
    212 		forkpid = fork();
    213 		if (forkpid == -1) {
    214 			perror("shutdown: fork");
    215 			exit(1);
    216 		}
    217 		if (forkpid) {
    218 			(void)printf("shutdown: [pid %d]\n", forkpid);
    219 			exit(0);
    220 		}
    221 	}
    222 #endif
    223 	openlog("shutdown", LOG_CONS, LOG_AUTH);
    224 	loop();
    225 	/* NOTREACHED */
    226 #ifdef __GNUC__
    227 	return 1;
    228 #endif
    229 }
    230 
    231 void
    232 loop()
    233 {
    234 	struct interval *tp;
    235 	u_int sltime;
    236 	int logged;
    237 
    238 	if (offset <= NOLOG_TIME) {
    239 		logged = 1;
    240 		nolog();
    241 	}
    242 	else
    243 		logged = 0;
    244 	tp = tlist;
    245 	if (tp->timeleft < offset)
    246 		(void)sleep((u_int)(offset - tp->timeleft));
    247 	else {
    248 		while (offset < tp->timeleft)
    249 			++tp;
    250 		/*
    251 		 * Warn now, if going to sleep more than a fifth of
    252 		 * the next wait time.
    253 		 */
    254 		if ((sltime = offset - tp->timeleft) != 0) {
    255 			if (sltime > tp->timetowait / 5)
    256 				timewarn(offset);
    257 			(void)sleep(sltime);
    258 		}
    259 	}
    260 	for (;; ++tp) {
    261 		timewarn(tp->timeleft);
    262 		if (!logged && tp->timeleft <= NOLOG_TIME) {
    263 			logged = 1;
    264 			nolog();
    265 		}
    266 		(void)sleep((u_int)tp->timetowait);
    267 		if (!tp->timeleft)
    268 			break;
    269 	}
    270 	die_you_gravy_sucking_pig_dog();
    271 }
    272 
    273 static jmp_buf alarmbuf;
    274 
    275 void
    276 timewarn(timeleft)
    277 	int timeleft;
    278 {
    279 	static int first;
    280 	static char hostname[MAXHOSTNAMELEN + 1];
    281 	FILE *pf;
    282 	char wcmd[MAXPATHLEN + 4];
    283 
    284 	if (!first++)
    285 		(void)gethostname(hostname, sizeof(hostname));
    286 
    287 	/* undoc -n option to wall suppresses normal wall banner */
    288 	(void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL);
    289 	if (!(pf = popen(wcmd, "w"))) {
    290 		syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
    291 		return;
    292 	}
    293 
    294 	(void)fprintf(pf,
    295 	    "\007*** %sSystem shutdown message from %s@%s ***\007\n",
    296 	    timeleft ? "": "FINAL ", whom, hostname);
    297 
    298 	if (timeleft > 10*60)
    299 		(void)fprintf(pf, "System going down at %5.5s\n\n",
    300 		    ctime(&shuttime) + 11);
    301 	else if (timeleft > 59)
    302 		(void)fprintf(pf, "System going down in %d minute%s\n\n",
    303 		    timeleft / 60, (timeleft > 60) ? "s" : "");
    304 	else if (timeleft)
    305 		(void)fprintf(pf, "System going down in 30 seconds\n\n");
    306 	else
    307 		(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
    308 
    309 	if (mbuflen)
    310 		(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
    311 
    312 	/*
    313 	 * play some games, just in case wall doesn't come back
    314 	 * probably unecessary, given that wall is careful.
    315 	 */
    316 	if (!setjmp(alarmbuf)) {
    317 		(void)signal(SIGALRM, timeout);
    318 		(void)alarm((u_int)30);
    319 		(void)pclose(pf);
    320 		(void)alarm((u_int)0);
    321 		(void)signal(SIGALRM, SIG_DFL);
    322 	}
    323 }
    324 
    325 void
    326 timeout(signo)
    327 	int signo;
    328 {
    329 	longjmp(alarmbuf, 1);
    330 }
    331 
    332 void
    333 die_you_gravy_sucking_pig_dog()
    334 {
    335 
    336 	syslog(LOG_NOTICE, "%s by %s: %s",
    337 	    doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf);
    338 	(void)sleep(2);
    339 
    340 	(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
    341 	if (killflg) {
    342 		(void)printf("\rbut you'll have to do it yourself\r\n");
    343 		finish(0);
    344 	}
    345 	if (dofast)
    346 		doitfast();
    347 	if (doreboot || dohalt) {
    348 		char *args[8], **arg, *path;
    349 
    350 		arg = &args[0];
    351 		if (doreboot) {
    352 			path = _PATH_REBOOT;
    353 			*arg++ = "reboot";
    354 		} else {
    355 			path = _PATH_HALT;
    356 			*arg++ = "halt";
    357 		}
    358 		if (dodump)
    359 			*arg++ = "-d";
    360 		if (nosync)
    361 			*arg++ = "-n";
    362 		*arg++ = "-l";
    363 		*arg++ = 0;
    364 #ifndef DEBUG
    365 		exect(path, args, (char **)0);
    366 		syslog(LOG_ERR, "shutdown: can't exec %s: %m", path);
    367 		perror("shutdown");
    368 #else
    369 		printf("%s", path);
    370 		for (arg = &args[0]; *arg; arg++)
    371 			printf(" %s", *arg);
    372 		printf("\n");
    373 #endif
    374 	} else {
    375 #ifndef DEBUG
    376 		(void)kill(1, SIGTERM);		/* to single user */
    377 #else
    378 		printf("kill 1\n");
    379 #endif
    380 	}
    381 	finish(0);
    382 }
    383 
    384 #define	ATOI2(s)	((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
    385 
    386 void
    387 getoffset(timearg)
    388 	char *timearg;
    389 {
    390 	struct tm *lt;
    391 	char *p;
    392 	time_t now;
    393 	int yearset;
    394 
    395 	if (!strcasecmp(timearg, "now")) {		/* now */
    396 		offset = 0;
    397 		return;
    398 	}
    399 
    400 	(void)time(&now);
    401 	if (*timearg == '+') {				/* +minutes */
    402 		if (!isdigit(*++timearg))
    403 			badtime();
    404 		offset = atoi(timearg) * 60;
    405 		shuttime = now + offset;
    406 		return;
    407 	}
    408 
    409 	/* handle hh:mm by getting rid of the colon */
    410 	for (p = timearg; *p; ++p)
    411 		if (!isascii(*p) || !isdigit(*p))
    412 			if (*p == ':' && strlen(p) == 3) {
    413 				p[0] = p[1];
    414 				p[1] = p[2];
    415 				p[2] = '\0';
    416 			}
    417 			else
    418 				badtime();
    419 
    420 	unsetenv("TZ");					/* OUR timezone */
    421 	lt = localtime(&now);				/* current time val */
    422 
    423 	lt->tm_sec = 0;
    424 
    425 	yearset = 0;
    426 	switch (strlen(timearg)) {
    427 	case 12:
    428 		lt->tm_year = ATOI2(timearg) * 100 - TM_YEAR_BASE;
    429 		yearset = 1;
    430 		/* FALLTHROUGH */
    431 	case 10:
    432 		if (yearset) {
    433 			lt->tm_year += ATOI2(timearg);
    434 		} else {
    435 			yearset = ATOI2(timearg);
    436 			if (yearset < 69)
    437 				lt->tm_year = yearset + 2000 - TM_YEAR_BASE;
    438 			else
    439 				lt->tm_year = yearset + 1900 - TM_YEAR_BASE;
    440 		}
    441 		/* FALLTHROUGH */
    442 	case 8:
    443 		lt->tm_mon = ATOI2(timearg);
    444 		--lt->tm_mon;
    445 		/* FALLTHROUGH */
    446 	case 6:
    447 		lt->tm_mday = ATOI2(timearg);
    448 		/* FALLTHROUGH */
    449 	case 4:
    450 		lt->tm_hour = ATOI2(timearg);
    451 		/* FALLTHROUGH */
    452 	case 2:
    453 		lt->tm_min = ATOI2(timearg);
    454 		break;
    455 	default:
    456 		badtime();
    457 	}
    458 
    459 	if ((shuttime = mktime(lt)) == -1)
    460 		badtime();
    461 	if ((offset = shuttime - now) < 0)
    462 		errx(1, "time is already past");
    463 }
    464 
    465 #define	FSMSG	"fastboot file for fsck\n"
    466 void
    467 doitfast()
    468 {
    469 	int fastfd;
    470 
    471 	if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC,
    472 	    0664)) >= 0) {
    473 		(void)write(fastfd, FSMSG, sizeof(FSMSG) - 1);
    474 		(void)close(fastfd);
    475 	}
    476 }
    477 
    478 #define	NOMSG	"\n\nNO LOGINS: System going down at "
    479 void
    480 nolog()
    481 {
    482 	int logfd;
    483 	char *ct;
    484 
    485 	(void)unlink(_PATH_NOLOGIN);	/* in case linked to another file */
    486 	(void)signal(SIGINT, finish);
    487 	(void)signal(SIGHUP, finish);
    488 	(void)signal(SIGQUIT, finish);
    489 	(void)signal(SIGTERM, finish);
    490 	if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
    491 	    0664)) >= 0) {
    492 		(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
    493 		ct = ctime(&shuttime);
    494 		(void)write(logfd, ct + 11, 5);
    495 		(void)write(logfd, "\n\n", 2);
    496 		(void)write(logfd, mbuf, strlen(mbuf));
    497 		(void)close(logfd);
    498 	}
    499 }
    500 
    501 void
    502 finish(signo)
    503 	int signo;
    504 {
    505 	if (!killflg)
    506 		(void)unlink(_PATH_NOLOGIN);
    507 	exit(0);
    508 }
    509 
    510 void
    511 badtime()
    512 {
    513 	warnx("illegal time format");
    514 	usage();
    515 }
    516 
    517 void
    518 usage()
    519 {
    520 	(void)fprintf(stderr,
    521 	    "usage: shutdown [-Ddfhknr] time [message ... | -]\n");
    522 	exit(1);
    523 }
    524