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shutdown.c revision 1.26 
      1 /*	$NetBSD: shutdown.c,v 1.26 1998/04/01 15:17:31 kleink 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 1.26 1998/04/01 15:17:31 kleink 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 char *whom, mbuf[BUFSIZ];
     96 
     97 void badtime __P((void));
     98 void die_you_gravy_sucking_pig_dog __P((void));
     99 void doitfast __P((void));
    100 void finish __P((int));
    101 void getoffset __P((char *));
    102 void loop __P((void));
    103 int main __P((int, char *[]));
    104 void nolog __P((void));
    105 void timeout __P((int));
    106 void timewarn __P((int));
    107 void usage __P((void));
    108 
    109 int
    110 main(argc, argv)
    111 	int argc;
    112 	char *argv[];
    113 {
    114 	char *p, *endp;
    115 	struct passwd *pw;
    116 	int arglen, ch, len;
    117 
    118 #ifndef DEBUG
    119 	if (geteuid())
    120 		errx(1, "NOT super-user");
    121 #endif
    122 	while ((ch = getopt(argc, argv, "Ddfhknr")) != -1)
    123 		switch (ch) {
    124 		case 'd':
    125 			dodump = 1;
    126 			break;
    127 		case 'D':
    128 			nofork = 1;
    129 			break;
    130 		case 'f':
    131 			dofast = 1;
    132 			break;
    133 		case 'h':
    134 			dohalt = 1;
    135 			break;
    136 		case 'k':
    137 			killflg = 1;
    138 			break;
    139 		case 'n':
    140 			nosync = 1;
    141 			break;
    142 		case 'r':
    143 			doreboot = 1;
    144 			break;
    145 		case '?':
    146 		default:
    147 			usage();
    148 		}
    149 	argc -= optind;
    150 	argv += optind;
    151 
    152 	if (argc < 1)
    153 		usage();
    154 
    155 	if (dodump && !dohalt && !doreboot)
    156 		doreboot = 1;
    157 
    158 	if (dofast && nosync) {
    159 		warnx("incompatible switches -f and -n");
    160 		usage();
    161 	}
    162 	if (dohalt && doreboot) {
    163 		warnx("incompatible switches -h and -r");
    164 		usage();
    165 	}
    166 
    167 	getoffset(*argv++);
    168 
    169 	if (argv[0])
    170 		if (strcmp(argv[0], "-") || argv[1]) {
    171 			for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
    172 				arglen = strlen(*argv);
    173 				if ((len -= arglen) <= 2)
    174 					break;
    175 				if (p != mbuf)
    176 					*p++ = ' ';
    177 				memmove(p, *argv, arglen);
    178 				p += arglen;
    179 			}
    180 			*p = '\n';
    181 			*++p = '\0';
    182 		} else {
    183 			p = mbuf;
    184 			endp = mbuf + sizeof(mbuf) - 2;
    185 			for (;;) {
    186 				if (!fgets(p, endp - p + 1, stdin))
    187 					break;
    188 				for (; *p &&  p < endp; ++p);
    189 				if (p == endp) {
    190 					*p = '\n';
    191 					*++p = '\0';
    192 					break;
    193 				}
    194 			}
    195 		}
    196 	mbuflen = strlen(mbuf);
    197 
    198 	if (offset)
    199 		(void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
    200 	else
    201 		(void)printf("Shutdown NOW!\n");
    202 
    203 	if (!(whom = getlogin()))
    204 		whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
    205 
    206 #ifdef DEBUG
    207 	(void)putc('\n', stdout);
    208 #else
    209 	(void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
    210 	if (nofork == 0) {
    211 		int forkpid;
    212 
    213 		forkpid = fork();
    214 		if (forkpid == -1) {
    215 			perror("shutdown: fork");
    216 			exit(1);
    217 		}
    218 		if (forkpid) {
    219 			(void)printf("shutdown: [pid %d]\n", forkpid);
    220 			exit(0);
    221 		}
    222 	}
    223 #endif
    224 	openlog("shutdown", LOG_CONS, LOG_AUTH);
    225 	loop();
    226 	/* NOTREACHED */
    227 #ifdef __GNUC__
    228 	return 1;
    229 #endif
    230 }
    231 
    232 void
    233 loop()
    234 {
    235 	struct interval *tp;
    236 	u_int sltime;
    237 	int logged;
    238 
    239 	if (offset <= NOLOG_TIME) {
    240 		logged = 1;
    241 		nolog();
    242 	}
    243 	else
    244 		logged = 0;
    245 	tp = tlist;
    246 	if (tp->timeleft < offset)
    247 		(void)sleep((u_int)(offset - tp->timeleft));
    248 	else {
    249 		while (offset < tp->timeleft)
    250 			++tp;
    251 		/*
    252 		 * Warn now, if going to sleep more than a fifth of
    253 		 * the next wait time.
    254 		 */
    255 		if ((sltime = offset - tp->timeleft) != 0) {
    256 			if (sltime > tp->timetowait / 5)
    257 				timewarn(offset);
    258 			(void)sleep(sltime);
    259 		}
    260 	}
    261 	for (;; ++tp) {
    262 		timewarn(tp->timeleft);
    263 		if (!logged && tp->timeleft <= NOLOG_TIME) {
    264 			logged = 1;
    265 			nolog();
    266 		}
    267 		(void)sleep((u_int)tp->timetowait);
    268 		if (!tp->timeleft)
    269 			break;
    270 	}
    271 	die_you_gravy_sucking_pig_dog();
    272 }
    273 
    274 static jmp_buf alarmbuf;
    275 
    276 void
    277 timewarn(timeleft)
    278 	int timeleft;
    279 {
    280 	static int first;
    281 	static char hostname[MAXHOSTNAMELEN + 1];
    282 	FILE *pf;
    283 	char wcmd[MAXPATHLEN + 4];
    284 
    285 	if (!first++)
    286 		(void)gethostname(hostname, sizeof(hostname));
    287 
    288 	/* undoc -n option to wall suppresses normal wall banner */
    289 	(void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL);
    290 	if (!(pf = popen(wcmd, "w"))) {
    291 		syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
    292 		return;
    293 	}
    294 
    295 	(void)fprintf(pf,
    296 	    "\007*** %sSystem shutdown message from %s@%s ***\007\n",
    297 	    timeleft ? "": "FINAL ", whom, hostname);
    298 
    299 	if (timeleft > 10*60)
    300 		(void)fprintf(pf, "System going down at %5.5s\n\n",
    301 		    ctime(&shuttime) + 11);
    302 	else if (timeleft > 59)
    303 		(void)fprintf(pf, "System going down in %d minute%s\n\n",
    304 		    timeleft / 60, (timeleft > 60) ? "s" : "");
    305 	else if (timeleft)
    306 		(void)fprintf(pf, "System going down in 30 seconds\n\n");
    307 	else
    308 		(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
    309 
    310 	if (mbuflen)
    311 		(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
    312 
    313 	/*
    314 	 * play some games, just in case wall doesn't come back
    315 	 * probably unecessary, given that wall is careful.
    316 	 */
    317 	if (!setjmp(alarmbuf)) {
    318 		(void)signal(SIGALRM, timeout);
    319 		(void)alarm((u_int)30);
    320 		(void)pclose(pf);
    321 		(void)alarm((u_int)0);
    322 		(void)signal(SIGALRM, SIG_DFL);
    323 	}
    324 }
    325 
    326 void
    327 timeout(signo)
    328 	int signo;
    329 {
    330 	longjmp(alarmbuf, 1);
    331 }
    332 
    333 void
    334 die_you_gravy_sucking_pig_dog()
    335 {
    336 
    337 	syslog(LOG_NOTICE, "%s by %s: %s",
    338 	    doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf);
    339 	(void)sleep(2);
    340 
    341 	(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
    342 	if (killflg) {
    343 		(void)printf("\rbut you'll have to do it yourself\r\n");
    344 		finish(0);
    345 	}
    346 	if (dofast)
    347 		doitfast();
    348 	if (doreboot || dohalt) {
    349 		char *args[8], **arg, *path;
    350 
    351 		arg = &args[0];
    352 		if (doreboot) {
    353 			path = _PATH_REBOOT;
    354 			*arg++ = "reboot";
    355 		} else {
    356 			path = _PATH_HALT;
    357 			*arg++ = "halt";
    358 		}
    359 		if (dodump)
    360 			*arg++ = "-d";
    361 		if (nosync)
    362 			*arg++ = "-n";
    363 		*arg++ = "-l";
    364 		*arg++ = 0;
    365 #ifndef DEBUG
    366 		exect(path, args, (char **)0);
    367 		syslog(LOG_ERR, "shutdown: can't exec %s: %m", path);
    368 		perror("shutdown");
    369 #else
    370 		printf("%s", path);
    371 		for (arg = &args[0]; *arg; arg++)
    372 			printf(" %s", *arg);
    373 		printf("\n");
    374 #endif
    375 	} else {
    376 #ifndef DEBUG
    377 		(void)kill(1, SIGTERM);		/* to single user */
    378 #else
    379 		printf("kill 1\n");
    380 #endif
    381 	}
    382 	finish(0);
    383 }
    384 
    385 #define	ATOI2(s)	((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
    386 
    387 void
    388 getoffset(timearg)
    389 	char *timearg;
    390 {
    391 	struct tm *lt;
    392 	char *p;
    393 	time_t now;
    394 	int yearset;
    395 
    396 	if (!strcasecmp(timearg, "now")) {		/* now */
    397 		offset = 0;
    398 		return;
    399 	}
    400 
    401 	(void)time(&now);
    402 	if (*timearg == '+') {				/* +minutes */
    403 		if (!isdigit(*++timearg))
    404 			badtime();
    405 		offset = atoi(timearg) * 60;
    406 		shuttime = now + offset;
    407 		return;
    408 	}
    409 
    410 	/* handle hh:mm by getting rid of the colon */
    411 	for (p = timearg; *p; ++p)
    412 		if (!isascii(*p) || !isdigit(*p))
    413 			if (*p == ':' && strlen(p) == 3) {
    414 				p[0] = p[1];
    415 				p[1] = p[2];
    416 				p[2] = '\0';
    417 			}
    418 			else
    419 				badtime();
    420 
    421 	unsetenv("TZ");					/* OUR timezone */
    422 	lt = localtime(&now);				/* current time val */
    423 
    424 	lt->tm_sec = 0;
    425 
    426 	yearset = 0;
    427 	switch (strlen(timearg)) {
    428 	case 12:
    429 		lt->tm_year = ATOI2(timearg) * 100 - TM_YEAR_BASE;
    430 		yearset = 1;
    431 		/* FALLTHROUGH */
    432 	case 10:
    433 		if (yearset) {
    434 			lt->tm_year += ATOI2(timearg);
    435 		} else {
    436 			yearset = ATOI2(timearg);
    437 			if (yearset < 69)
    438 				lt->tm_year = yearset + 2000 - TM_YEAR_BASE;
    439 			else
    440 				lt->tm_year = yearset + 1900 - TM_YEAR_BASE;
    441 		}
    442 		/* FALLTHROUGH */
    443 	case 8:
    444 		lt->tm_mon = ATOI2(timearg);
    445 		--lt->tm_mon;
    446 		/* FALLTHROUGH */
    447 	case 6:
    448 		lt->tm_mday = ATOI2(timearg);
    449 		/* FALLTHROUGH */
    450 	case 4:
    451 		lt->tm_hour = ATOI2(timearg);
    452 		/* FALLTHROUGH */
    453 	case 2:
    454 		lt->tm_min = ATOI2(timearg);
    455 		break;
    456 	default:
    457 		badtime();
    458 	}
    459 
    460 	if ((shuttime = mktime(lt)) == -1)
    461 		badtime();
    462 	if ((offset = shuttime - now) < 0)
    463 		errx(1, "time is already past");
    464 }
    465 
    466 #define	FSMSG	"fastboot file for fsck\n"
    467 void
    468 doitfast()
    469 {
    470 	int fastfd;
    471 
    472 	if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC,
    473 	    0664)) >= 0) {
    474 		(void)write(fastfd, FSMSG, sizeof(FSMSG) - 1);
    475 		(void)close(fastfd);
    476 	}
    477 }
    478 
    479 #define	NOMSG	"\n\nNO LOGINS: System going down at "
    480 void
    481 nolog()
    482 {
    483 	int logfd;
    484 	char *ct;
    485 
    486 	(void)unlink(_PATH_NOLOGIN);	/* in case linked to another file */
    487 	(void)signal(SIGINT, finish);
    488 	(void)signal(SIGHUP, finish);
    489 	(void)signal(SIGQUIT, finish);
    490 	(void)signal(SIGTERM, finish);
    491 	if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
    492 	    0664)) >= 0) {
    493 		(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
    494 		ct = ctime(&shuttime);
    495 		(void)write(logfd, ct + 11, 5);
    496 		(void)write(logfd, "\n\n", 2);
    497 		(void)write(logfd, mbuf, strlen(mbuf));
    498 		(void)close(logfd);
    499 	}
    500 }
    501 
    502 void
    503 finish(signo)
    504 	int signo;
    505 {
    506 	if (!killflg)
    507 		(void)unlink(_PATH_NOLOGIN);
    508 	exit(0);
    509 }
    510 
    511 void
    512 badtime()
    513 {
    514 	warnx("illegal time format");
    515 	usage();
    516 }
    517 
    518 void
    519 usage()
    520 {
    521 	(void)fprintf(stderr,
    522 	    "usage: shutdown [-Ddfhknr] time [message ... | -]\n");
    523 	exit(1);
    524 }
    525