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shutdown.c revision 1.36 
      1 /*	$NetBSD: shutdown.c,v 1.36 2000/07/20 17:33:57 jdolecek 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 1.36 2000/07/20 17:33:57 jdolecek 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 #include <sys/wait.h>
     55 
     56 #include <ctype.h>
     57 #include <err.h>
     58 #include <fcntl.h>
     59 #include <pwd.h>
     60 #include <setjmp.h>
     61 #include <signal.h>
     62 #include <stdio.h>
     63 #include <stdlib.h>
     64 #include <string.h>
     65 #include <time.h>
     66 #include <tzfile.h>
     67 #include <unistd.h>
     68 
     69 #include "pathnames.h"
     70 
     71 #ifdef DEBUG
     72 #undef _PATH_NOLOGIN
     73 #define	_PATH_NOLOGIN	"./nologin"
     74 #undef _PATH_FASTBOOT
     75 #define	_PATH_FASTBOOT	"./fastboot"
     76 #endif
     77 
     78 #define	H		*60*60
     79 #define	M		*60
     80 #define	S		*1
     81 #define	NOLOG_TIME	5*60
     82 struct interval {
     83 	int timeleft, timetowait;
     84 } tlist[] = {
     85 	{ 10 H,  5 H },	{  5 H,  3 H },	{  2 H,  1 H },	{ 1 H, 30 M },
     86 	{ 30 M, 10 M },	{ 20 M, 10 M },	{ 10 M,  5 M },	{ 5 M,  3 M },
     87 	{  2 M,  1 M },	{  1 M, 30 S },	{ 30 S, 30 S },
     88 	{  0, 0 }
     89 };
     90 #undef H
     91 #undef M
     92 #undef S
     93 
     94 /* time to wait for rc.shutdown to finish - 5 minutes by default */
     95 #define RCSHUTDOWN_TIMEOUT		(5 * 60)
     96 
     97 static time_t offset, shuttime;
     98 static int rcshutdown_timeout = RCSHUTDOWN_TIMEOUT;
     99 static int dofast, dohalt, doreboot, killflg, mbuflen, nofork, nosync, dodump;
    100 static int dopowerdown;
    101 static const char *whom;
    102 static char mbuf[BUFSIZ];
    103 
    104 void badtime __P((void));
    105 void die_you_gravy_sucking_pig_dog __P((void));
    106 void doitfast __P((void));
    107 void dorcshutdown __P((void));
    108 void finish __P((int));
    109 void getoffset __P((char *));
    110 void loop __P((void));
    111 int main __P((int, char *[]));
    112 void nolog __P((void));
    113 void timeout __P((int));
    114 void timewarn __P((int));
    115 void usage __P((void));
    116 
    117 int
    118 main(argc, argv)
    119 	int argc;
    120 	char *argv[];
    121 {
    122 	char *p, *endp;
    123 	struct passwd *pw;
    124 	int arglen, ch, len;
    125 
    126 #ifndef DEBUG
    127 	if (geteuid())
    128 		errx(1, "NOT super-user");
    129 #endif
    130 	while ((ch = getopt(argc, argv, "?DdfhknprT:")) != -1)
    131 		switch (ch) {
    132 		case 'd':
    133 			dodump = 1;
    134 			break;
    135 		case 'D':
    136 			nofork = 1;
    137 			break;
    138 		case 'f':
    139 			dofast = 1;
    140 			break;
    141 		case 'p':
    142 			dopowerdown = 1;
    143 			/* FALLTHROUGH */
    144 		case 'h':
    145 			dohalt = 1;
    146 			break;
    147 		case 'k':
    148 			killflg = 1;
    149 			break;
    150 		case 'n':
    151 			nosync = 1;
    152 			break;
    153 		case 'r':
    154 			doreboot = 1;
    155 			break;
    156 		case 'T':
    157 			rcshutdown_timeout = (int) strtol(optarg, &endp, 10);
    158 			if (*endp != '\0' || rcshutdown_timeout <= 0)
    159 				errx(1, "invalid timeout value - must be positive number");
    160 			break;
    161 		case '?':
    162 		default:
    163 			usage();
    164 		}
    165 	argc -= optind;
    166 	argv += optind;
    167 
    168 	if (argc < 1)
    169 		usage();
    170 
    171 	if (dodump && !dohalt && !doreboot)
    172 		doreboot = 1;
    173 
    174 	if (dofast && nosync) {
    175 		warnx("incompatible switches -f and -n");
    176 		usage();
    177 	}
    178 	if (dohalt && doreboot) {
    179 		const char *which_flag = dopowerdown ? "p" : "h";
    180 
    181 		warnx("incompatible switches -%s and -r", which_flag);
    182 		usage();
    183 	}
    184 
    185 	getoffset(*argv++);
    186 
    187 	if (argv[0]) {
    188 		if (strcmp(argv[0], "-") || argv[1]) {
    189 			for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
    190 				arglen = strlen(*argv);
    191 				if ((len -= arglen) <= 2)
    192 					break;
    193 				if (p != mbuf)
    194 					*p++ = ' ';
    195 				memmove(p, *argv, arglen);
    196 				p += arglen;
    197 			}
    198 			*p = '\n';
    199 			*++p = '\0';
    200 		} else {
    201 			p = mbuf;
    202 			endp = mbuf + sizeof(mbuf) - 2;
    203 			for (;;) {
    204 				if (!fgets(p, endp - p + 1, stdin))
    205 					break;
    206 				for (; *p &&  p < endp; ++p);
    207 				if (p == endp) {
    208 					*p = '\n';
    209 					*++p = '\0';
    210 					break;
    211 				}
    212 			}
    213 		}
    214 	}
    215 	mbuflen = strlen(mbuf);
    216 
    217 	if (offset)
    218 		(void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
    219 	else
    220 		(void)printf("Shutdown NOW!\n");
    221 
    222 	if (!(whom = getlogin()))
    223 		whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
    224 
    225 #ifdef DEBUG
    226 	(void)putc('\n', stdout);
    227 #else
    228 	(void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
    229 	if (nofork == 0) {
    230 		int forkpid;
    231 
    232 		forkpid = fork();
    233 		if (forkpid == -1) {
    234 			perror("shutdown: fork");
    235 			exit(1);
    236 		}
    237 		if (forkpid) {
    238 			(void)printf("shutdown: [pid %d]\n", forkpid);
    239 			exit(0);
    240 		}
    241 	}
    242 #endif
    243 	openlog("shutdown", LOG_CONS, LOG_AUTH);
    244 	loop();
    245 	/* NOTREACHED */
    246 #ifdef __GNUC__
    247 	return 1;
    248 #endif
    249 }
    250 
    251 void
    252 loop()
    253 {
    254 	struct interval *tp;
    255 	u_int sltime;
    256 	int logged;
    257 
    258 	if (offset <= NOLOG_TIME) {
    259 		logged = 1;
    260 		nolog();
    261 	}
    262 	else
    263 		logged = 0;
    264 	tp = tlist;
    265 	if (tp->timeleft < offset)
    266 		(void)sleep((u_int)(offset - tp->timeleft));
    267 	else {
    268 		while (offset < tp->timeleft)
    269 			++tp;
    270 		/*
    271 		 * Warn now, if going to sleep more than a fifth of
    272 		 * the next wait time.
    273 		 */
    274 		if ((sltime = offset - tp->timeleft) != 0) {
    275 			if (sltime > tp->timetowait / 5)
    276 				timewarn(offset);
    277 			(void)sleep(sltime);
    278 		}
    279 	}
    280 	for (;; ++tp) {
    281 		timewarn(tp->timeleft);
    282 		if (!logged && tp->timeleft <= NOLOG_TIME) {
    283 			logged = 1;
    284 			nolog();
    285 		}
    286 		(void)sleep((u_int)tp->timetowait);
    287 		if (!tp->timeleft)
    288 			break;
    289 	}
    290 	die_you_gravy_sucking_pig_dog();
    291 }
    292 
    293 static jmp_buf alarmbuf;
    294 
    295 void
    296 timewarn(timeleft)
    297 	int timeleft;
    298 {
    299 	static int first;
    300 	static char hostname[MAXHOSTNAMELEN + 1];
    301 	FILE *pf;
    302 	char wcmd[MAXPATHLEN + 4];
    303 
    304 	if (!first++) {
    305 		(void)gethostname(hostname, sizeof(hostname));
    306 		hostname[sizeof(hostname) - 1] = '\0';
    307 	}
    308 
    309 	/* undoc -n option to wall suppresses normal wall banner */
    310 	(void)snprintf(wcmd, sizeof wcmd, "%s -n", _PATH_WALL);
    311 	if (!(pf = popen(wcmd, "w"))) {
    312 		syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
    313 		return;
    314 	}
    315 
    316 	(void)fprintf(pf,
    317 	    "\007*** %sSystem shutdown message from %s@%s ***\007\n",
    318 	    timeleft ? "": "FINAL ", whom, hostname);
    319 
    320 	if (timeleft > 10*60)
    321 		(void)fprintf(pf, "System going down at %5.5s\n\n",
    322 		    ctime(&shuttime) + 11);
    323 	else if (timeleft > 59)
    324 		(void)fprintf(pf, "System going down in %d minute%s\n\n",
    325 		    timeleft / 60, (timeleft > 60) ? "s" : "");
    326 	else if (timeleft)
    327 		(void)fprintf(pf, "System going down in 30 seconds\n\n");
    328 	else
    329 		(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
    330 
    331 	if (mbuflen)
    332 		(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
    333 
    334 	/*
    335 	 * play some games, just in case wall doesn't come back
    336 	 * probably unecessary, given that wall is careful.
    337 	 */
    338 	if (!setjmp(alarmbuf)) {
    339 		(void)signal(SIGALRM, timeout);
    340 		(void)alarm((u_int)30);
    341 		(void)pclose(pf);
    342 		(void)alarm((u_int)0);
    343 		(void)signal(SIGALRM, SIG_DFL);
    344 	}
    345 }
    346 
    347 void
    348 timeout(signo)
    349 	int signo;
    350 {
    351 	longjmp(alarmbuf, 1);
    352 }
    353 
    354 void
    355 die_you_gravy_sucking_pig_dog()
    356 {
    357 
    358 	syslog(LOG_NOTICE, "%s by %s: %s",
    359 	    doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf);
    360 	(void)sleep(2);
    361 
    362 	(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
    363 	if (killflg) {
    364 		(void)printf("\rbut you'll have to do it yourself\r\n");
    365 		finish(0);
    366 	}
    367 	if (dofast)
    368 		doitfast();
    369 	dorcshutdown();
    370 	if (doreboot || dohalt) {
    371 		char *args[16], **arg, *path;
    372 
    373 		arg = &args[0];
    374 		if (doreboot) {
    375 			path = _PATH_REBOOT;
    376 			*arg++ = "reboot";
    377 		} else {
    378 			path = _PATH_HALT;
    379 			*arg++ = "halt";
    380 		}
    381 		if (dodump)
    382 			*arg++ = "-d";
    383 		if (nosync)
    384 			*arg++ = "-n";
    385 		if (dopowerdown)
    386 			*arg++ = "-p";
    387 		*arg++ = "-l";
    388 		*arg++ = 0;
    389 #ifndef DEBUG
    390 		execve(path, args, (char **)0);
    391 		syslog(LOG_ERR, "shutdown: can't exec %s: %m", path);
    392 		perror("shutdown");
    393 #else
    394 		printf("%s", path);
    395 		for (arg = &args[0]; *arg; arg++)
    396 			printf(" %s", *arg);
    397 		printf("\n");
    398 #endif
    399 	} else {
    400 #ifndef DEBUG
    401 		(void)kill(1, SIGTERM);		/* to single user */
    402 #else
    403 		printf("kill 1\n");
    404 #endif
    405 	}
    406 	finish(0);
    407 }
    408 
    409 #define	ATOI2(s)	((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
    410 
    411 void
    412 getoffset(timearg)
    413 	char *timearg;
    414 {
    415 	struct tm *lt;
    416 	char *p;
    417 	time_t now;
    418 	int yearset;
    419 
    420 	(void)time(&now);
    421 	if (!strcasecmp(timearg, "now")) {		/* now */
    422 		offset = 0;
    423 		shuttime = now;
    424 		return;
    425 	}
    426 
    427 	if (*timearg == '+') {				/* +minutes */
    428 		if (!isdigit(*++timearg))
    429 			badtime();
    430 		offset = atoi(timearg) * 60;
    431 		shuttime = now + offset;
    432 		return;
    433 	}
    434 
    435 	/* handle hh:mm by getting rid of the colon */
    436 	for (p = timearg; *p; ++p)
    437 		if (!isascii(*p) || !isdigit(*p)) {
    438 			if (*p == ':' && strlen(p) == 3) {
    439 				p[0] = p[1];
    440 				p[1] = p[2];
    441 				p[2] = '\0';
    442 			}
    443 			else
    444 				badtime();
    445 		}
    446 
    447 	unsetenv("TZ");					/* OUR timezone */
    448 	lt = localtime(&now);				/* current time val */
    449 
    450 	lt->tm_sec = 0;
    451 
    452 	yearset = 0;
    453 	switch (strlen(timearg)) {
    454 	case 12:
    455 		lt->tm_year = ATOI2(timearg) * 100 - TM_YEAR_BASE;
    456 		yearset = 1;
    457 		/* FALLTHROUGH */
    458 	case 10:
    459 		if (yearset) {
    460 			lt->tm_year += ATOI2(timearg);
    461 		} else {
    462 			yearset = ATOI2(timearg);
    463 			if (yearset < 69)
    464 				lt->tm_year = yearset + 2000 - TM_YEAR_BASE;
    465 			else
    466 				lt->tm_year = yearset + 1900 - TM_YEAR_BASE;
    467 		}
    468 		/* FALLTHROUGH */
    469 	case 8:
    470 		lt->tm_mon = ATOI2(timearg);
    471 		--lt->tm_mon;
    472 		/* FALLTHROUGH */
    473 	case 6:
    474 		lt->tm_mday = ATOI2(timearg);
    475 		/* FALLTHROUGH */
    476 	case 4:
    477 		lt->tm_hour = ATOI2(timearg);
    478 		/* FALLTHROUGH */
    479 	case 2:
    480 		lt->tm_min = ATOI2(timearg);
    481 		break;
    482 	default:
    483 		badtime();
    484 	}
    485 
    486 	if ((shuttime = mktime(lt)) == -1)
    487 		badtime();
    488 	if ((offset = shuttime - now) < 0)
    489 		errx(1, "time is already past");
    490 }
    491 
    492 void
    493 dorcshutdown()
    494 {
    495 	pid_t rc_pid, outpid;
    496 	time_t end_time;
    497 	int status;
    498 
    499 	(void)printf("\r\nAbout to run shutdown hooks...\r\n");
    500 
    501 	rc_pid = fork();
    502 	switch (rc_pid) {
    503 	case -1:
    504 		/* error forking */
    505 		warn("dorcshutdown: fork");
    506 		break;
    507 	case 0:
    508 		/* child */
    509 		execl("/bin/sh", "sh", "-c", __CONCAT(". ", _PATH_RCSHUTDOWN),
    510 				NULL);
    511 		err(1, "exec of '/bin/sh -c \". %s\" failed",
    512 			_PATH_RCSHUTDOWN);
    513 		/* NOTREACHED */
    514 		break;
    515 	default:
    516 		/* parent */
    517 		end_time = time(NULL) + rcshutdown_timeout;
    518 		outpid = 0;
    519 		do {
    520 			outpid = waitpid(rc_pid, &status, WNOHANG);
    521 			if (outpid == rc_pid) {
    522 				/* child exited */
    523 				break;
    524 			} else if (outpid == 0) {
    525 				/* child not terminated yet */
    526 				sleep(2);
    527 			} else {
    528 				/* an error occurred */
    529 				warn("dorcshutdown: waitpid");
    530 				break;
    531 			}
    532 		} while(time(NULL) < end_time);
    533 
    534 		/* if rc.shutdown didn't exit within timeout, print warning */
    535 		if (outpid == 0) {
    536 			warnx("%s didn't exit within timeout %ds, killed",
    537 				 _PATH_RCSHUTDOWN, rcshutdown_timeout);
    538 		}
    539 
    540 		/* if child did not exit voluntarily, kill it now */
    541 		if (outpid != rc_pid)
    542 			(void) kill(rc_pid, SIGKILL);
    543 	}
    544 
    545 	(void)printf("\r\nDone running shutdown hooks.\r\n");
    546 	(void)sleep(5);		/* Give operator a chance to abort this. */
    547 }
    548 
    549 #define	FSMSG	"fastboot file for fsck\n"
    550 void
    551 doitfast()
    552 {
    553 	int fastfd;
    554 
    555 	if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC,
    556 	    0664)) >= 0) {
    557 		(void)write(fastfd, FSMSG, sizeof(FSMSG) - 1);
    558 		(void)close(fastfd);
    559 	}
    560 }
    561 
    562 #define	NOMSG	"\n\nNO LOGINS: System going down at "
    563 void
    564 nolog()
    565 {
    566 	int logfd;
    567 	char *ct;
    568 
    569 	(void)unlink(_PATH_NOLOGIN);	/* in case linked to another file */
    570 	(void)signal(SIGINT, finish);
    571 	(void)signal(SIGHUP, finish);
    572 	(void)signal(SIGQUIT, finish);
    573 	(void)signal(SIGTERM, finish);
    574 	if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
    575 	    0664)) >= 0) {
    576 		(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
    577 		ct = ctime(&shuttime);
    578 		(void)write(logfd, ct + 11, 5);
    579 		(void)write(logfd, "\n\n", 2);
    580 		(void)write(logfd, mbuf, strlen(mbuf));
    581 		(void)close(logfd);
    582 	}
    583 }
    584 
    585 void
    586 finish(signo)
    587 	int signo;
    588 {
    589 
    590 	if (!killflg)
    591 		(void)unlink(_PATH_NOLOGIN);
    592 	exit(0);
    593 }
    594 
    595 void
    596 badtime()
    597 {
    598 
    599 	warnx("illegal time format");
    600 	usage();
    601 }
    602 
    603 void
    604 usage()
    605 {
    606 
    607 	(void)fprintf(stderr,
    608 	    "usage: shutdown [-Ddfhknpr] [-T timeout] time [message ... | -]\n");
    609 	exit(1);
    610 }
    611