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shutdown.c revision 1.21 
      1 /*	$NetBSD: shutdown.c,v 1.21 1998/01/20 23:13:31 mycroft 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 1.21 1998/01/20 23:13:31 mycroft 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, 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, "dfhknr")) != -1)
    122 		switch (ch) {
    123 		case 'd':
    124 			dodump = 1;
    125 			break;
    126 		case 'f':
    127 			dofast = 1;
    128 			break;
    129 		case 'h':
    130 			dohalt = 1;
    131 			break;
    132 		case 'k':
    133 			killflg = 1;
    134 			break;
    135 		case 'n':
    136 			nosync = 1;
    137 			break;
    138 		case 'r':
    139 			doreboot = 1;
    140 			break;
    141 		case '?':
    142 		default:
    143 			usage();
    144 		}
    145 	argc -= optind;
    146 	argv += optind;
    147 
    148 	if (argc < 1)
    149 		usage();
    150 
    151 	if (dodump && !dohalt && !doreboot)
    152 		doreboot = 1;
    153 
    154 	if (dofast && nosync) {
    155 		warnx("incompatible switches -f and -n");
    156 		usage();
    157 	}
    158 	if (dohalt && doreboot) {
    159 		warnx("incompatible switches -h and -r");
    160 		usage();
    161 	}
    162 
    163 	getoffset(*argv++);
    164 
    165 	if (argv[0])
    166 		if (strcmp(argv[0], "-") || argv[1]) {
    167 			for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
    168 				arglen = strlen(*argv);
    169 				if ((len -= arglen) <= 2)
    170 					break;
    171 				if (p != mbuf)
    172 					*p++ = ' ';
    173 				memmove(p, *argv, arglen);
    174 				p += arglen;
    175 			}
    176 			*p = '\n';
    177 			*++p = '\0';
    178 		} else {
    179 			p = mbuf;
    180 			endp = mbuf + sizeof(mbuf) - 2;
    181 			for (;;) {
    182 				if (!fgets(p, endp - p + 1, stdin))
    183 					break;
    184 				for (; *p &&  p < endp; ++p);
    185 				if (p == endp) {
    186 					*p = '\n';
    187 					*++p = '\0';
    188 					break;
    189 				}
    190 			}
    191 		}
    192 	mbuflen = strlen(mbuf);
    193 
    194 	if (offset)
    195 		(void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
    196 	else
    197 		(void)printf("Shutdown NOW!\n");
    198 
    199 	if (!(whom = getlogin()))
    200 		whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
    201 
    202 #ifdef DEBUG
    203 	(void)putc('\n', stdout);
    204 #else
    205 	(void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
    206 	{
    207 		int forkpid;
    208 
    209 		forkpid = fork();
    210 		if (forkpid == -1) {
    211 			perror("shutdown: fork");
    212 			exit(1);
    213 		}
    214 		if (forkpid) {
    215 			(void)printf("shutdown: [pid %d]\n", forkpid);
    216 			exit(0);
    217 		}
    218 	}
    219 #endif
    220 	openlog("shutdown", LOG_CONS, LOG_AUTH);
    221 	loop();
    222 	/* NOTREACHED */
    223 #ifdef __GNUC__
    224 	return 1;
    225 #endif
    226 }
    227 
    228 void
    229 loop()
    230 {
    231 	struct interval *tp;
    232 	u_int sltime;
    233 	int logged;
    234 
    235 	if (offset <= NOLOG_TIME) {
    236 		logged = 1;
    237 		nolog();
    238 	}
    239 	else
    240 		logged = 0;
    241 	tp = tlist;
    242 	if (tp->timeleft < offset)
    243 		(void)sleep((u_int)(offset - tp->timeleft));
    244 	else {
    245 		while (offset < tp->timeleft)
    246 			++tp;
    247 		/*
    248 		 * Warn now, if going to sleep more than a fifth of
    249 		 * the next wait time.
    250 		 */
    251 		if ((sltime = offset - tp->timeleft) != 0) {
    252 			if (sltime > tp->timetowait / 5)
    253 				timewarn(offset);
    254 			(void)sleep(sltime);
    255 		}
    256 	}
    257 	for (;; ++tp) {
    258 		timewarn(tp->timeleft);
    259 		if (!logged && tp->timeleft <= NOLOG_TIME) {
    260 			logged = 1;
    261 			nolog();
    262 		}
    263 		(void)sleep((u_int)tp->timetowait);
    264 		if (!tp->timeleft)
    265 			break;
    266 	}
    267 	die_you_gravy_sucking_pig_dog();
    268 }
    269 
    270 static jmp_buf alarmbuf;
    271 
    272 void
    273 timewarn(timeleft)
    274 	int timeleft;
    275 {
    276 	static int first;
    277 	static char hostname[MAXHOSTNAMELEN + 1];
    278 	FILE *pf;
    279 	char wcmd[MAXPATHLEN + 4];
    280 
    281 	if (!first++)
    282 		(void)gethostname(hostname, sizeof(hostname));
    283 
    284 	/* undoc -n option to wall suppresses normal wall banner */
    285 	(void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL);
    286 	if (!(pf = popen(wcmd, "w"))) {
    287 		syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
    288 		return;
    289 	}
    290 
    291 	(void)fprintf(pf,
    292 	    "\007*** %sSystem shutdown message from %s@%s ***\007\n",
    293 	    timeleft ? "": "FINAL ", whom, hostname);
    294 
    295 	if (timeleft > 10*60)
    296 		(void)fprintf(pf, "System going down at %5.5s\n\n",
    297 		    ctime(&shuttime) + 11);
    298 	else if (timeleft > 59)
    299 		(void)fprintf(pf, "System going down in %d minute%s\n\n",
    300 		    timeleft / 60, (timeleft > 60) ? "s" : "");
    301 	else if (timeleft)
    302 		(void)fprintf(pf, "System going down in 30 seconds\n\n");
    303 	else
    304 		(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
    305 
    306 	if (mbuflen)
    307 		(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
    308 
    309 	/*
    310 	 * play some games, just in case wall doesn't come back
    311 	 * probably unecessary, given that wall is careful.
    312 	 */
    313 	if (!setjmp(alarmbuf)) {
    314 		(void)signal(SIGALRM, timeout);
    315 		(void)alarm((u_int)30);
    316 		(void)pclose(pf);
    317 		(void)alarm((u_int)0);
    318 		(void)signal(SIGALRM, SIG_DFL);
    319 	}
    320 }
    321 
    322 void
    323 timeout(signo)
    324 	int signo;
    325 {
    326 	longjmp(alarmbuf, 1);
    327 }
    328 
    329 void
    330 die_you_gravy_sucking_pig_dog()
    331 {
    332 
    333 	syslog(LOG_NOTICE, "%s by %s: %s",
    334 	    doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf);
    335 	(void)sleep(2);
    336 
    337 	(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
    338 	if (killflg) {
    339 		(void)printf("\rbut you'll have to do it yourself\r\n");
    340 		finish(0);
    341 	}
    342 	if (dofast)
    343 		doitfast();
    344 	if (doreboot || dohalt) {
    345 		char *args[8], **arg, *path;
    346 
    347 		arg = &args[0];
    348 		if (doreboot) {
    349 			path = _PATH_REBOOT;
    350 			*arg++ = "reboot";
    351 		} else {
    352 			path = _PATH_HALT;
    353 			*arg++ = "halt";
    354 		}
    355 		if (dodump)
    356 			*arg++ = "-d";
    357 		if (nosync)
    358 			*arg++ = "-n";
    359 		*arg++ = "-l";
    360 		*arg++ = 0;
    361 #ifndef DEBUG
    362 		exect(path, args, (char **)0);
    363 		syslog(LOG_ERR, "shutdown: can't exec %s: %m", path);
    364 		perror("shutdown");
    365 #else
    366 		printf("%s", path);
    367 		for (arg = &args[0]; *arg; arg++)
    368 			printf(" %s", *arg);
    369 		printf("\n");
    370 #endif
    371 	} else {
    372 #ifndef DEBUG
    373 		(void)kill(1, SIGTERM);		/* to single user */
    374 #else
    375 		printf("kill 1\n");
    376 #endif
    377 	}
    378 	finish(0);
    379 }
    380 
    381 #define	ATOI2(p)	(p[0] - '0') * 10 + (p[1] - '0'); p += 2;
    382 
    383 void
    384 getoffset(timearg)
    385 	char *timearg;
    386 {
    387 	struct tm *lt;
    388 	char *p;
    389 	time_t now;
    390 	int yearset;
    391 
    392 	if (!strcasecmp(timearg, "now")) {		/* now */
    393 		offset = 0;
    394 		return;
    395 	}
    396 
    397 	(void)time(&now);
    398 	if (*timearg == '+') {				/* +minutes */
    399 		if (!isdigit(*++timearg))
    400 			badtime();
    401 		offset = atoi(timearg) * 60;
    402 		shuttime = now + offset;
    403 		return;
    404 	}
    405 
    406 	/* handle hh:mm by getting rid of the colon */
    407 	for (p = timearg; *p; ++p)
    408 		if (!isascii(*p) || !isdigit(*p))
    409 			if (*p == ':' && strlen(p) == 3) {
    410 				p[0] = p[1];
    411 				p[1] = p[2];
    412 				p[2] = '\0';
    413 			}
    414 			else
    415 				badtime();
    416 
    417 	unsetenv("TZ");					/* OUR timezone */
    418 	lt = localtime(&now);				/* current time val */
    419 
    420 	lt->tm_sec = 0;
    421 
    422 	yearset = 0;
    423 	switch (strlen(timearg)) {
    424 	case 12:
    425 		lt->tm_year = ATOI2(timearg);
    426 		lt->tm_year *= 100;
    427 		yearset = 1;
    428 		/* FALLTHROUGH */
    429 	case 10:
    430 		if (yearset) {
    431 			yearset = ATOI2(timearg);
    432 			lt->tm_year += yearset;
    433 		} else {
    434 			yearset = ATOI2(timearg);
    435 			if (yearset < 69)
    436 				lt->tm_year = yearset + 2000;
    437 			else
    438 				lt->tm_year = yearset + 1900;
    439 		}
    440 		lt->tm_year -= TM_YEAR_BASE;
    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 [-dfhknr] [[[[[cc]yy]mm]dd]hh]mm [- | message ...]\n");
    522 	(void)fprintf(stderr,
    523 	    "       shutdown [-dfhknr] +time [- | message ...]\n");
    524 	exit(1);
    525 }
    526