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shutdown.c revision 1.39 
      1 /*	$NetBSD: shutdown.c,v 1.39 2002/10/18 20:35:36 atatat 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 1.39 2002/10/18 20:35:36 atatat 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 <time.h>
     65 #include <tzfile.h>
     66 #include <unistd.h>
     67 
     68 #include "pathnames.h"
     69 
     70 #ifdef DEBUG
     71 #undef _PATH_NOLOGIN
     72 #define	_PATH_NOLOGIN	"./nologin"
     73 #undef _PATH_FASTBOOT
     74 #define	_PATH_FASTBOOT	"./fastboot"
     75 #endif
     76 
     77 #define	H		*60*60
     78 #define	M		*60
     79 #define	S		*1
     80 #define	NOLOG_TIME	5*60
     81 struct interval {
     82 	int timeleft, timetowait;
     83 } tlist[] = {
     84 	{ 10 H,  5 H },	{  5 H,  3 H },	{  2 H,  1 H },	{ 1 H, 30 M },
     85 	{ 30 M, 10 M },	{ 20 M, 10 M },	{ 10 M,  5 M },	{ 5 M,  3 M },
     86 	{  2 M,  1 M },	{  1 M, 30 S },	{ 30 S, 30 S },
     87 	{  0, 0 }
     88 };
     89 #undef H
     90 #undef M
     91 #undef S
     92 
     93 static time_t offset, shuttime;
     94 static int dofast, dohalt, doreboot, killflg, mbuflen, nofork, nosync, dodump;
     95 static int dopowerdown;
     96 static const char *whom;
     97 static char mbuf[BUFSIZ];
     98 char *bootstr;
     99 
    100 void badtime __P((void));
    101 void die_you_gravy_sucking_pig_dog __P((void));
    102 void doitfast __P((void));
    103 void dorcshutdown __P((void));
    104 void finish __P((int));
    105 void getoffset __P((char *));
    106 void loop __P((void));
    107 int main __P((int, char *[]));
    108 void nolog __P((void));
    109 void timeout __P((int));
    110 void timewarn __P((int));
    111 void usage __P((void));
    112 
    113 int
    114 main(argc, argv)
    115 	int argc;
    116 	char *argv[];
    117 {
    118 	char *p, *endp;
    119 	struct passwd *pw;
    120 	int arglen, ch, len;
    121 
    122 #ifndef DEBUG
    123 	if (geteuid())
    124 		errx(1, "NOT super-user");
    125 #endif
    126 	while ((ch = getopt(argc, argv, "b:Ddfhknpr")) != -1)
    127 		switch (ch) {
    128 		case 'b':
    129 			bootstr = optarg;
    130 			break;
    131 		case 'd':
    132 			dodump = 1;
    133 			break;
    134 		case 'D':
    135 			nofork = 1;
    136 			break;
    137 		case 'f':
    138 			dofast = 1;
    139 			break;
    140 		case 'p':
    141 			dopowerdown = 1;
    142 			/* FALLTHROUGH */
    143 		case 'h':
    144 			dohalt = 1;
    145 			break;
    146 		case 'k':
    147 			killflg = 1;
    148 			break;
    149 		case 'n':
    150 			nosync = 1;
    151 			break;
    152 		case 'r':
    153 			doreboot = 1;
    154 			break;
    155 		case '?':
    156 		default:
    157 			usage();
    158 		}
    159 	argc -= optind;
    160 	argv += optind;
    161 
    162 	if (argc < 1)
    163 		usage();
    164 
    165 	if (dodump && !dohalt && !doreboot)
    166 		doreboot = 1;
    167 
    168 	if (dofast && nosync) {
    169 		warnx("incompatible switches -f and -n");
    170 		usage();
    171 	}
    172 	if (dohalt && doreboot) {
    173 		const char *which_flag = dopowerdown ? "p" : "h";
    174 
    175 		warnx("incompatible switches -%s and -r", which_flag);
    176 		usage();
    177 	}
    178 
    179 	getoffset(*argv++);
    180 
    181 	if (argv[0]) {
    182 		if (strcmp(argv[0], "-") || argv[1]) {
    183 			for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
    184 				arglen = strlen(*argv);
    185 				if ((len -= arglen) <= 2)
    186 					break;
    187 				if (p != mbuf)
    188 					*p++ = ' ';
    189 				memmove(p, *argv, arglen);
    190 				p += arglen;
    191 			}
    192 			*p = '\n';
    193 			*++p = '\0';
    194 		} else {
    195 			p = mbuf;
    196 			endp = mbuf + sizeof(mbuf) - 2;
    197 			for (;;) {
    198 				if (!fgets(p, endp - p + 1, stdin))
    199 					break;
    200 				for (; *p &&  p < endp; ++p);
    201 				if (p == endp) {
    202 					*p = '\n';
    203 					*++p = '\0';
    204 					break;
    205 				}
    206 			}
    207 		}
    208 	}
    209 	mbuflen = strlen(mbuf);
    210 
    211 	if (offset)
    212 		(void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
    213 	else
    214 		(void)printf("Shutdown NOW!\n");
    215 
    216 	if (!(whom = getlogin()))
    217 		whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
    218 
    219 #ifdef DEBUG
    220 	(void)putc('\n', stdout);
    221 #else
    222 	(void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
    223 	if (nofork == 0) {
    224 		int forkpid;
    225 
    226 		forkpid = fork();
    227 		if (forkpid == -1) {
    228 			perror("shutdown: fork");
    229 			exit(1);
    230 		}
    231 		if (forkpid) {
    232 			(void)printf("shutdown: [pid %d]\n", forkpid);
    233 			exit(0);
    234 		}
    235 	}
    236 #endif
    237 	openlog("shutdown", LOG_CONS, LOG_AUTH);
    238 	loop();
    239 	/* NOTREACHED */
    240 #ifdef __GNUC__
    241 	return 1;
    242 #endif
    243 }
    244 
    245 void
    246 loop()
    247 {
    248 	struct interval *tp;
    249 	u_int sltime;
    250 	int logged;
    251 
    252 	if (offset <= NOLOG_TIME) {
    253 		logged = 1;
    254 		nolog();
    255 	}
    256 	else
    257 		logged = 0;
    258 	tp = tlist;
    259 	if (tp->timeleft < offset)
    260 		(void)sleep((u_int)(offset - tp->timeleft));
    261 	else {
    262 		while (offset < tp->timeleft)
    263 			++tp;
    264 		/*
    265 		 * Warn now, if going to sleep more than a fifth of
    266 		 * the next wait time.
    267 		 */
    268 		if ((sltime = offset - tp->timeleft) != 0) {
    269 			if (sltime > tp->timetowait / 5)
    270 				timewarn(offset);
    271 			(void)sleep(sltime);
    272 		}
    273 	}
    274 	for (;; ++tp) {
    275 		timewarn(tp->timeleft);
    276 		if (!logged && tp->timeleft <= NOLOG_TIME) {
    277 			logged = 1;
    278 			nolog();
    279 		}
    280 		(void)sleep((u_int)tp->timetowait);
    281 		if (!tp->timeleft)
    282 			break;
    283 	}
    284 	die_you_gravy_sucking_pig_dog();
    285 }
    286 
    287 static jmp_buf alarmbuf;
    288 
    289 void
    290 timewarn(timeleft)
    291 	int timeleft;
    292 {
    293 	static int first;
    294 	static char hostname[MAXHOSTNAMELEN + 1];
    295 	FILE *pf;
    296 	char wcmd[MAXPATHLEN + 4];
    297 
    298 	if (!first++) {
    299 		(void)gethostname(hostname, sizeof(hostname));
    300 		hostname[sizeof(hostname) - 1] = '\0';
    301 	}
    302 
    303 	/* undoc -n option to wall suppresses normal wall banner */
    304 	(void)snprintf(wcmd, sizeof wcmd, "%s -n", _PATH_WALL);
    305 	if (!(pf = popen(wcmd, "w"))) {
    306 		syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
    307 		return;
    308 	}
    309 
    310 	(void)fprintf(pf,
    311 	    "\007*** %sSystem shutdown message from %s@%s ***\007\n",
    312 	    timeleft ? "": "FINAL ", whom, hostname);
    313 
    314 	if (timeleft > 10*60)
    315 		(void)fprintf(pf, "System going down at %5.5s\n\n",
    316 		    ctime(&shuttime) + 11);
    317 	else if (timeleft > 59)
    318 		(void)fprintf(pf, "System going down in %d minute%s\n\n",
    319 		    timeleft / 60, (timeleft > 60) ? "s" : "");
    320 	else if (timeleft)
    321 		(void)fprintf(pf, "System going down in 30 seconds\n\n");
    322 	else
    323 		(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
    324 
    325 	if (mbuflen)
    326 		(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
    327 
    328 	/*
    329 	 * play some games, just in case wall doesn't come back
    330 	 * probably unecessary, given that wall is careful.
    331 	 */
    332 	if (!setjmp(alarmbuf)) {
    333 		(void)signal(SIGALRM, timeout);
    334 		(void)alarm((u_int)30);
    335 		(void)pclose(pf);
    336 		(void)alarm((u_int)0);
    337 		(void)signal(SIGALRM, SIG_DFL);
    338 	}
    339 }
    340 
    341 void
    342 timeout(signo)
    343 	int signo;
    344 {
    345 	longjmp(alarmbuf, 1);
    346 }
    347 
    348 void
    349 die_you_gravy_sucking_pig_dog()
    350 {
    351 
    352 	syslog(LOG_NOTICE, "%s by %s: %s",
    353 	    doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf);
    354 	(void)sleep(2);
    355 
    356 	(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
    357 	if (killflg) {
    358 		(void)printf("\rbut you'll have to do it yourself\r\n");
    359 		finish(0);
    360 	}
    361 	if (dofast)
    362 		doitfast();
    363 	dorcshutdown();
    364 	if (doreboot || dohalt) {
    365 		char *args[16], **arg, *path;
    366 
    367 		arg = &args[0];
    368 		if (doreboot) {
    369 			path = _PATH_REBOOT;
    370 			*arg++ = "reboot";
    371 		} else {
    372 			path = _PATH_HALT;
    373 			*arg++ = "halt";
    374 		}
    375 		if (dodump)
    376 			*arg++ = "-d";
    377 		if (nosync)
    378 			*arg++ = "-n";
    379 		if (dopowerdown)
    380 			*arg++ = "-p";
    381 		*arg++ = "-l";
    382 		if (bootstr)
    383 			*arg++ = bootstr;
    384 		*arg++ = 0;
    385 #ifndef DEBUG
    386 		execve(path, args, (char **)0);
    387 		syslog(LOG_ERR, "shutdown: can't exec %s: %m", path);
    388 		perror("shutdown");
    389 #else
    390 		printf("%s", path);
    391 		for (arg = &args[0]; *arg; arg++)
    392 			printf(" %s", *arg);
    393 		printf("\n");
    394 #endif
    395 	} else {
    396 #ifndef DEBUG
    397 		(void)kill(1, SIGTERM);		/* to single user */
    398 #else
    399 		printf("kill 1\n");
    400 #endif
    401 	}
    402 	finish(0);
    403 }
    404 
    405 #define	ATOI2(s)	((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
    406 
    407 void
    408 getoffset(timearg)
    409 	char *timearg;
    410 {
    411 	struct tm *lt;
    412 	char *p;
    413 	time_t now;
    414 	int yearset;
    415 
    416 	(void)time(&now);
    417 	if (!strcasecmp(timearg, "now")) {		/* now */
    418 		offset = 0;
    419 		shuttime = now;
    420 		return;
    421 	}
    422 
    423 	if (*timearg == '+') {				/* +minutes */
    424 		if (!isdigit(*++timearg))
    425 			badtime();
    426 		offset = atoi(timearg) * 60;
    427 		shuttime = now + offset;
    428 		return;
    429 	}
    430 
    431 	/* handle hh:mm by getting rid of the colon */
    432 	for (p = timearg; *p; ++p)
    433 		if (!isascii(*p) || !isdigit(*p)) {
    434 			if (*p == ':' && strlen(p) == 3) {
    435 				p[0] = p[1];
    436 				p[1] = p[2];
    437 				p[2] = '\0';
    438 			}
    439 			else
    440 				badtime();
    441 		}
    442 
    443 	unsetenv("TZ");					/* OUR timezone */
    444 	lt = localtime(&now);				/* current time val */
    445 
    446 	lt->tm_sec = 0;
    447 
    448 	yearset = 0;
    449 	switch (strlen(timearg)) {
    450 	case 12:
    451 		lt->tm_year = ATOI2(timearg) * 100 - TM_YEAR_BASE;
    452 		yearset = 1;
    453 		/* FALLTHROUGH */
    454 	case 10:
    455 		if (yearset) {
    456 			lt->tm_year += ATOI2(timearg);
    457 		} else {
    458 			yearset = ATOI2(timearg);
    459 			if (yearset < 69)
    460 				lt->tm_year = yearset + 2000 - TM_YEAR_BASE;
    461 			else
    462 				lt->tm_year = yearset + 1900 - TM_YEAR_BASE;
    463 		}
    464 		/* FALLTHROUGH */
    465 	case 8:
    466 		lt->tm_mon = ATOI2(timearg);
    467 		--lt->tm_mon;
    468 		/* FALLTHROUGH */
    469 	case 6:
    470 		lt->tm_mday = ATOI2(timearg);
    471 		/* FALLTHROUGH */
    472 	case 4:
    473 		lt->tm_hour = ATOI2(timearg);
    474 		/* FALLTHROUGH */
    475 	case 2:
    476 		lt->tm_min = ATOI2(timearg);
    477 		break;
    478 	default:
    479 		badtime();
    480 	}
    481 
    482 	if ((shuttime = mktime(lt)) == -1)
    483 		badtime();
    484 	if ((offset = shuttime - now) < 0)
    485 		errx(1, "time is already past");
    486 }
    487 
    488 void
    489 dorcshutdown()
    490 {
    491 	(void)printf("\r\nAbout to run shutdown hooks...\r\n");
    492 	(void)system(". " _PATH_RCSHUTDOWN);
    493 	(void)sleep(5);		/* Give operator a chance to abort this. */
    494 	(void)printf("\r\nDone running shutdown hooks.\r\n");
    495 }
    496 
    497 #define	FSMSG	"fastboot file for fsck\n"
    498 void
    499 doitfast()
    500 {
    501 	int fastfd;
    502 
    503 	if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC,
    504 	    0664)) >= 0) {
    505 		(void)write(fastfd, FSMSG, sizeof(FSMSG) - 1);
    506 		(void)close(fastfd);
    507 	}
    508 }
    509 
    510 #define	NOMSG	"\n\nNO LOGINS: System going down at "
    511 void
    512 nolog()
    513 {
    514 	int logfd;
    515 	char *ct;
    516 
    517 	(void)unlink(_PATH_NOLOGIN);	/* in case linked to another file */
    518 	(void)signal(SIGINT, finish);
    519 	(void)signal(SIGHUP, finish);
    520 	(void)signal(SIGQUIT, finish);
    521 	(void)signal(SIGTERM, finish);
    522 	if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
    523 	    0664)) >= 0) {
    524 		(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
    525 		ct = ctime(&shuttime);
    526 		(void)write(logfd, ct + 11, 5);
    527 		(void)write(logfd, "\n\n", 2);
    528 		(void)write(logfd, mbuf, strlen(mbuf));
    529 		(void)close(logfd);
    530 	}
    531 }
    532 
    533 void
    534 finish(signo)
    535 	int signo;
    536 {
    537 
    538 	if (!killflg)
    539 		(void)unlink(_PATH_NOLOGIN);
    540 	exit(0);
    541 }
    542 
    543 void
    544 badtime()
    545 {
    546 
    547 	warnx("illegal time format");
    548 	usage();
    549 }
    550 
    551 void
    552 usage()
    553 {
    554 
    555 	(void)fprintf(stderr,
    556 	    "usage: shutdown [-Ddfhknpr] time [message ... | -]\n");
    557 	exit(1);
    558 }
    559