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shutdown.c revision 1.28 
      1 /*	$NetBSD: shutdown.c,v 1.28 1998/07/05 08:34:25 mrg 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 1.28 1998/07/05 08:34:25 mrg 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 char *whom, mbuf[BUFSIZ];
     97 
     98 void badtime __P((void));
     99 void die_you_gravy_sucking_pig_dog __P((void));
    100 void doitfast __P((void));
    101 void finish __P((int));
    102 void getoffset __P((char *));
    103 void loop __P((void));
    104 int main __P((int, char *[]));
    105 void nolog __P((void));
    106 void timeout __P((int));
    107 void timewarn __P((int));
    108 void usage __P((void));
    109 
    110 int
    111 main(argc, argv)
    112 	int argc;
    113 	char *argv[];
    114 {
    115 	char *p, *endp;
    116 	struct passwd *pw;
    117 	int arglen, ch, len;
    118 
    119 #ifndef DEBUG
    120 	if (geteuid())
    121 		errx(1, "NOT super-user");
    122 #endif
    123 	while ((ch = getopt(argc, argv, "Ddfhknpr")) != -1)
    124 		switch (ch) {
    125 		case 'd':
    126 			dodump = 1;
    127 			break;
    128 		case 'D':
    129 			nofork = 1;
    130 			break;
    131 		case 'f':
    132 			dofast = 1;
    133 			break;
    134 		case 'p':
    135 			dopowerdown = 1;
    136 			/* FALLTHROUGH */
    137 		case 'h':
    138 			dohalt = 1;
    139 			break;
    140 		case 'k':
    141 			killflg = 1;
    142 			break;
    143 		case 'n':
    144 			nosync = 1;
    145 			break;
    146 		case 'r':
    147 			doreboot = 1;
    148 			break;
    149 		case '?':
    150 		default:
    151 			usage();
    152 		}
    153 	argc -= optind;
    154 	argv += optind;
    155 
    156 	if (argc < 1)
    157 		usage();
    158 
    159 	if (dodump && !dohalt && !doreboot)
    160 		doreboot = 1;
    161 
    162 	if (dofast && nosync) {
    163 		warnx("incompatible switches -f and -n");
    164 		usage();
    165 	}
    166 	if (dohalt && doreboot) {
    167 		const char *which_flag = dopowerdown ? "p" : "h";
    168 
    169 		warnx("incompatible switches -%s and -r", which_flag);
    170 		usage();
    171 	}
    172 
    173 	getoffset(*argv++);
    174 
    175 	if (argv[0])
    176 		if (strcmp(argv[0], "-") || argv[1]) {
    177 			for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
    178 				arglen = strlen(*argv);
    179 				if ((len -= arglen) <= 2)
    180 					break;
    181 				if (p != mbuf)
    182 					*p++ = ' ';
    183 				memmove(p, *argv, arglen);
    184 				p += arglen;
    185 			}
    186 			*p = '\n';
    187 			*++p = '\0';
    188 		} else {
    189 			p = mbuf;
    190 			endp = mbuf + sizeof(mbuf) - 2;
    191 			for (;;) {
    192 				if (!fgets(p, endp - p + 1, stdin))
    193 					break;
    194 				for (; *p &&  p < endp; ++p);
    195 				if (p == endp) {
    196 					*p = '\n';
    197 					*++p = '\0';
    198 					break;
    199 				}
    200 			}
    201 		}
    202 	mbuflen = strlen(mbuf);
    203 
    204 	if (offset)
    205 		(void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
    206 	else
    207 		(void)printf("Shutdown NOW!\n");
    208 
    209 	if (!(whom = getlogin()))
    210 		whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
    211 
    212 #ifdef DEBUG
    213 	(void)putc('\n', stdout);
    214 #else
    215 	(void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
    216 	if (nofork == 0) {
    217 		int forkpid;
    218 
    219 		forkpid = fork();
    220 		if (forkpid == -1) {
    221 			perror("shutdown: fork");
    222 			exit(1);
    223 		}
    224 		if (forkpid) {
    225 			(void)printf("shutdown: [pid %d]\n", forkpid);
    226 			exit(0);
    227 		}
    228 	}
    229 #endif
    230 	openlog("shutdown", LOG_CONS, LOG_AUTH);
    231 	loop();
    232 	/* NOTREACHED */
    233 #ifdef __GNUC__
    234 	return 1;
    235 #endif
    236 }
    237 
    238 void
    239 loop()
    240 {
    241 	struct interval *tp;
    242 	u_int sltime;
    243 	int logged;
    244 
    245 	if (offset <= NOLOG_TIME) {
    246 		logged = 1;
    247 		nolog();
    248 	}
    249 	else
    250 		logged = 0;
    251 	tp = tlist;
    252 	if (tp->timeleft < offset)
    253 		(void)sleep((u_int)(offset - tp->timeleft));
    254 	else {
    255 		while (offset < tp->timeleft)
    256 			++tp;
    257 		/*
    258 		 * Warn now, if going to sleep more than a fifth of
    259 		 * the next wait time.
    260 		 */
    261 		if ((sltime = offset - tp->timeleft) != 0) {
    262 			if (sltime > tp->timetowait / 5)
    263 				timewarn(offset);
    264 			(void)sleep(sltime);
    265 		}
    266 	}
    267 	for (;; ++tp) {
    268 		timewarn(tp->timeleft);
    269 		if (!logged && tp->timeleft <= NOLOG_TIME) {
    270 			logged = 1;
    271 			nolog();
    272 		}
    273 		(void)sleep((u_int)tp->timetowait);
    274 		if (!tp->timeleft)
    275 			break;
    276 	}
    277 	die_you_gravy_sucking_pig_dog();
    278 }
    279 
    280 static jmp_buf alarmbuf;
    281 
    282 void
    283 timewarn(timeleft)
    284 	int timeleft;
    285 {
    286 	static int first;
    287 	static char hostname[MAXHOSTNAMELEN + 1];
    288 	FILE *pf;
    289 	char wcmd[MAXPATHLEN + 4];
    290 
    291 	if (!first++) {
    292 		(void)gethostname(hostname, sizeof(hostname));
    293 		hostname[sizeof(hostname) - 1] = '\0';
    294 	}
    295 
    296 	/* undoc -n option to wall suppresses normal wall banner */
    297 	(void)snprintf(wcmd, sizeof wcmd, "%s -n", _PATH_WALL);
    298 	if (!(pf = popen(wcmd, "w"))) {
    299 		syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
    300 		return;
    301 	}
    302 
    303 	(void)fprintf(pf,
    304 	    "\007*** %sSystem shutdown message from %s@%s ***\007\n",
    305 	    timeleft ? "": "FINAL ", whom, hostname);
    306 
    307 	if (timeleft > 10*60)
    308 		(void)fprintf(pf, "System going down at %5.5s\n\n",
    309 		    ctime(&shuttime) + 11);
    310 	else if (timeleft > 59)
    311 		(void)fprintf(pf, "System going down in %d minute%s\n\n",
    312 		    timeleft / 60, (timeleft > 60) ? "s" : "");
    313 	else if (timeleft)
    314 		(void)fprintf(pf, "System going down in 30 seconds\n\n");
    315 	else
    316 		(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
    317 
    318 	if (mbuflen)
    319 		(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
    320 
    321 	/*
    322 	 * play some games, just in case wall doesn't come back
    323 	 * probably unecessary, given that wall is careful.
    324 	 */
    325 	if (!setjmp(alarmbuf)) {
    326 		(void)signal(SIGALRM, timeout);
    327 		(void)alarm((u_int)30);
    328 		(void)pclose(pf);
    329 		(void)alarm((u_int)0);
    330 		(void)signal(SIGALRM, SIG_DFL);
    331 	}
    332 }
    333 
    334 void
    335 timeout(signo)
    336 	int signo;
    337 {
    338 	longjmp(alarmbuf, 1);
    339 }
    340 
    341 void
    342 die_you_gravy_sucking_pig_dog()
    343 {
    344 
    345 	syslog(LOG_NOTICE, "%s by %s: %s",
    346 	    doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf);
    347 	(void)sleep(2);
    348 
    349 	(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
    350 	if (killflg) {
    351 		(void)printf("\rbut you'll have to do it yourself\r\n");
    352 		finish(0);
    353 	}
    354 	if (dofast)
    355 		doitfast();
    356 	if (doreboot || dohalt) {
    357 		char *args[16], **arg, *path;
    358 
    359 		arg = &args[0];
    360 		if (doreboot) {
    361 			path = _PATH_REBOOT;
    362 			*arg++ = "reboot";
    363 		} else {
    364 			path = _PATH_HALT;
    365 			*arg++ = "halt";
    366 		}
    367 		if (dodump)
    368 			*arg++ = "-d";
    369 		if (nosync)
    370 			*arg++ = "-n";
    371 		if (dopowerdown)
    372 			*arg++ = "-p";
    373 		*arg++ = "-l";
    374 		*arg++ = 0;
    375 #ifndef DEBUG
    376 		exect(path, args, (char **)0);
    377 		syslog(LOG_ERR, "shutdown: can't exec %s: %m", path);
    378 		perror("shutdown");
    379 #else
    380 		printf("%s", path);
    381 		for (arg = &args[0]; *arg; arg++)
    382 			printf(" %s", *arg);
    383 		printf("\n");
    384 #endif
    385 	} else {
    386 #ifndef DEBUG
    387 		(void)kill(1, SIGTERM);		/* to single user */
    388 #else
    389 		printf("kill 1\n");
    390 #endif
    391 	}
    392 	finish(0);
    393 }
    394 
    395 #define	ATOI2(s)	((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
    396 
    397 void
    398 getoffset(timearg)
    399 	char *timearg;
    400 {
    401 	struct tm *lt;
    402 	char *p;
    403 	time_t now;
    404 	int yearset;
    405 
    406 	if (!strcasecmp(timearg, "now")) {		/* now */
    407 		offset = 0;
    408 		return;
    409 	}
    410 
    411 	(void)time(&now);
    412 	if (*timearg == '+') {				/* +minutes */
    413 		if (!isdigit(*++timearg))
    414 			badtime();
    415 		offset = atoi(timearg) * 60;
    416 		shuttime = now + offset;
    417 		return;
    418 	}
    419 
    420 	/* handle hh:mm by getting rid of the colon */
    421 	for (p = timearg; *p; ++p)
    422 		if (!isascii(*p) || !isdigit(*p))
    423 			if (*p == ':' && strlen(p) == 3) {
    424 				p[0] = p[1];
    425 				p[1] = p[2];
    426 				p[2] = '\0';
    427 			}
    428 			else
    429 				badtime();
    430 
    431 	unsetenv("TZ");					/* OUR timezone */
    432 	lt = localtime(&now);				/* current time val */
    433 
    434 	lt->tm_sec = 0;
    435 
    436 	yearset = 0;
    437 	switch (strlen(timearg)) {
    438 	case 12:
    439 		lt->tm_year = ATOI2(timearg) * 100 - TM_YEAR_BASE;
    440 		yearset = 1;
    441 		/* FALLTHROUGH */
    442 	case 10:
    443 		if (yearset) {
    444 			lt->tm_year += ATOI2(timearg);
    445 		} else {
    446 			yearset = ATOI2(timearg);
    447 			if (yearset < 69)
    448 				lt->tm_year = yearset + 2000 - TM_YEAR_BASE;
    449 			else
    450 				lt->tm_year = yearset + 1900 - TM_YEAR_BASE;
    451 		}
    452 		/* FALLTHROUGH */
    453 	case 8:
    454 		lt->tm_mon = ATOI2(timearg);
    455 		--lt->tm_mon;
    456 		/* FALLTHROUGH */
    457 	case 6:
    458 		lt->tm_mday = ATOI2(timearg);
    459 		/* FALLTHROUGH */
    460 	case 4:
    461 		lt->tm_hour = ATOI2(timearg);
    462 		/* FALLTHROUGH */
    463 	case 2:
    464 		lt->tm_min = ATOI2(timearg);
    465 		break;
    466 	default:
    467 		badtime();
    468 	}
    469 
    470 	if ((shuttime = mktime(lt)) == -1)
    471 		badtime();
    472 	if ((offset = shuttime - now) < 0)
    473 		errx(1, "time is already past");
    474 }
    475 
    476 #define	FSMSG	"fastboot file for fsck\n"
    477 void
    478 doitfast()
    479 {
    480 	int fastfd;
    481 
    482 	if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC,
    483 	    0664)) >= 0) {
    484 		(void)write(fastfd, FSMSG, sizeof(FSMSG) - 1);
    485 		(void)close(fastfd);
    486 	}
    487 }
    488 
    489 #define	NOMSG	"\n\nNO LOGINS: System going down at "
    490 void
    491 nolog()
    492 {
    493 	int logfd;
    494 	char *ct;
    495 
    496 	(void)unlink(_PATH_NOLOGIN);	/* in case linked to another file */
    497 	(void)signal(SIGINT, finish);
    498 	(void)signal(SIGHUP, finish);
    499 	(void)signal(SIGQUIT, finish);
    500 	(void)signal(SIGTERM, finish);
    501 	if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
    502 	    0664)) >= 0) {
    503 		(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
    504 		ct = ctime(&shuttime);
    505 		(void)write(logfd, ct + 11, 5);
    506 		(void)write(logfd, "\n\n", 2);
    507 		(void)write(logfd, mbuf, strlen(mbuf));
    508 		(void)close(logfd);
    509 	}
    510 }
    511 
    512 void
    513 finish(signo)
    514 	int signo;
    515 {
    516 
    517 	if (!killflg)
    518 		(void)unlink(_PATH_NOLOGIN);
    519 	exit(0);
    520 }
    521 
    522 void
    523 badtime()
    524 {
    525 
    526 	warnx("illegal time format");
    527 	usage();
    528 }
    529 
    530 void
    531 usage()
    532 {
    533 
    534 	(void)fprintf(stderr,
    535 	    "usage: shutdown [-Ddfhknr] time [message ... | -]\n");
    536 	exit(1);
    537 }
    538