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shutdown.c revision 1.23 
      1 /*	$NetBSD: shutdown.c,v 1.23 1998/01/21 00:32:53 mycroft Exp $	*/
      2 
      3 #define	DEBUG
      4 
      5 /*
      6  * Copyright (c) 1988, 1990, 1993
      7  *	The Regents of the University of California.  All rights reserved.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *	This product includes software developed by the University of
     20  *	California, Berkeley and its contributors.
     21  * 4. Neither the name of the University nor the names of its contributors
     22  *    may be used to endorse or promote products derived from this software
     23  *    without specific prior written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     35  * SUCH DAMAGE.
     36  */
     37 
     38 #include <sys/cdefs.h>
     39 #ifndef lint
     40 __COPYRIGHT("@(#) Copyright (c) 1988, 1990, 1993\n\
     41 	The Regents of the University of California.  All rights reserved.\n");
     42 #endif /* not lint */
     43 
     44 #ifndef lint
     45 #if 0
     46 static char sccsid[] = "@(#)shutdown.c	8.4 (Berkeley) 4/28/95";
     47 #else
     48 __RCSID("$NetBSD: shutdown.c,v 1.23 1998/01/21 00:32:53 mycroft Exp $");
     49 #endif
     50 #endif /* not lint */
     51 
     52 #include <sys/param.h>
     53 #include <sys/time.h>
     54 #include <sys/resource.h>
     55 #include <sys/syslog.h>
     56 
     57 #include <ctype.h>
     58 #include <err.h>
     59 #include <fcntl.h>
     60 #include <pwd.h>
     61 #include <setjmp.h>
     62 #include <signal.h>
     63 #include <stdio.h>
     64 #include <stdlib.h>
     65 #include <string.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 static time_t offset, shuttime;
     95 static int dofast, dohalt, doreboot, killflg, mbuflen, nosync, dodump;
     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, "dfhknr")) != -1)
    124 		switch (ch) {
    125 		case 'd':
    126 			dodump = 1;
    127 			break;
    128 		case 'f':
    129 			dofast = 1;
    130 			break;
    131 		case 'h':
    132 			dohalt = 1;
    133 			break;
    134 		case 'k':
    135 			killflg = 1;
    136 			break;
    137 		case 'n':
    138 			nosync = 1;
    139 			break;
    140 		case 'r':
    141 			doreboot = 1;
    142 			break;
    143 		case '?':
    144 		default:
    145 			usage();
    146 		}
    147 	argc -= optind;
    148 	argv += optind;
    149 
    150 	if (argc < 1)
    151 		usage();
    152 
    153 	if (dodump && !dohalt && !doreboot)
    154 		doreboot = 1;
    155 
    156 	if (dofast && nosync) {
    157 		warnx("incompatible switches -f and -n");
    158 		usage();
    159 	}
    160 	if (dohalt && doreboot) {
    161 		warnx("incompatible switches -h and -r");
    162 		usage();
    163 	}
    164 
    165 	getoffset(*argv++);
    166 
    167 	if (argv[0])
    168 		if (strcmp(argv[0], "-") || argv[1]) {
    169 			for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
    170 				arglen = strlen(*argv);
    171 				if ((len -= arglen) <= 2)
    172 					break;
    173 				if (p != mbuf)
    174 					*p++ = ' ';
    175 				memmove(p, *argv, arglen);
    176 				p += arglen;
    177 			}
    178 			*p = '\n';
    179 			*++p = '\0';
    180 		} else {
    181 			p = mbuf;
    182 			endp = mbuf + sizeof(mbuf) - 2;
    183 			for (;;) {
    184 				if (!fgets(p, endp - p + 1, stdin))
    185 					break;
    186 				for (; *p &&  p < endp; ++p);
    187 				if (p == endp) {
    188 					*p = '\n';
    189 					*++p = '\0';
    190 					break;
    191 				}
    192 			}
    193 		}
    194 	mbuflen = strlen(mbuf);
    195 
    196 	if (offset)
    197 		(void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
    198 	else
    199 		(void)printf("Shutdown NOW!\n");
    200 
    201 	if (!(whom = getlogin()))
    202 		whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
    203 
    204 #ifdef DEBUG
    205 	(void)putc('\n', stdout);
    206 #else
    207 	(void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
    208 	{
    209 		int forkpid;
    210 
    211 		forkpid = fork();
    212 		if (forkpid == -1) {
    213 			perror("shutdown: fork");
    214 			exit(1);
    215 		}
    216 		if (forkpid) {
    217 			(void)printf("shutdown: [pid %d]\n", forkpid);
    218 			exit(0);
    219 		}
    220 	}
    221 #endif
    222 	openlog("shutdown", LOG_CONS, LOG_AUTH);
    223 	loop();
    224 	/* NOTREACHED */
    225 #ifdef __GNUC__
    226 	return 1;
    227 #endif
    228 }
    229 
    230 void
    231 loop()
    232 {
    233 	struct interval *tp;
    234 	u_int sltime;
    235 	int logged;
    236 
    237 	if (offset <= NOLOG_TIME) {
    238 		logged = 1;
    239 		nolog();
    240 	}
    241 	else
    242 		logged = 0;
    243 	tp = tlist;
    244 	if (tp->timeleft < offset)
    245 		(void)sleep((u_int)(offset - tp->timeleft));
    246 	else {
    247 		while (offset < tp->timeleft)
    248 			++tp;
    249 		/*
    250 		 * Warn now, if going to sleep more than a fifth of
    251 		 * the next wait time.
    252 		 */
    253 		if ((sltime = offset - tp->timeleft) != 0) {
    254 			if (sltime > tp->timetowait / 5)
    255 				timewarn(offset);
    256 			(void)sleep(sltime);
    257 		}
    258 	}
    259 	for (;; ++tp) {
    260 		timewarn(tp->timeleft);
    261 		if (!logged && tp->timeleft <= NOLOG_TIME) {
    262 			logged = 1;
    263 			nolog();
    264 		}
    265 		(void)sleep((u_int)tp->timetowait);
    266 		if (!tp->timeleft)
    267 			break;
    268 	}
    269 	die_you_gravy_sucking_pig_dog();
    270 }
    271 
    272 static jmp_buf alarmbuf;
    273 
    274 void
    275 timewarn(timeleft)
    276 	int timeleft;
    277 {
    278 	static int first;
    279 	static char hostname[MAXHOSTNAMELEN + 1];
    280 	FILE *pf;
    281 	char wcmd[MAXPATHLEN + 4];
    282 
    283 	if (!first++)
    284 		(void)gethostname(hostname, sizeof(hostname));
    285 
    286 	/* undoc -n option to wall suppresses normal wall banner */
    287 	(void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL);
    288 	if (!(pf = popen(wcmd, "w"))) {
    289 		syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
    290 		return;
    291 	}
    292 
    293 	(void)fprintf(pf,
    294 	    "\007*** %sSystem shutdown message from %s@%s ***\007\n",
    295 	    timeleft ? "": "FINAL ", whom, hostname);
    296 
    297 	if (timeleft > 10*60)
    298 		(void)fprintf(pf, "System going down at %5.5s\n\n",
    299 		    ctime(&shuttime) + 11);
    300 	else if (timeleft > 59)
    301 		(void)fprintf(pf, "System going down in %d minute%s\n\n",
    302 		    timeleft / 60, (timeleft > 60) ? "s" : "");
    303 	else if (timeleft)
    304 		(void)fprintf(pf, "System going down in 30 seconds\n\n");
    305 	else
    306 		(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
    307 
    308 	if (mbuflen)
    309 		(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
    310 
    311 	/*
    312 	 * play some games, just in case wall doesn't come back
    313 	 * probably unecessary, given that wall is careful.
    314 	 */
    315 	if (!setjmp(alarmbuf)) {
    316 		(void)signal(SIGALRM, timeout);
    317 		(void)alarm((u_int)30);
    318 		(void)pclose(pf);
    319 		(void)alarm((u_int)0);
    320 		(void)signal(SIGALRM, SIG_DFL);
    321 	}
    322 }
    323 
    324 void
    325 timeout(signo)
    326 	int signo;
    327 {
    328 	longjmp(alarmbuf, 1);
    329 }
    330 
    331 void
    332 die_you_gravy_sucking_pig_dog()
    333 {
    334 
    335 	syslog(LOG_NOTICE, "%s by %s: %s",
    336 	    doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf);
    337 	(void)sleep(2);
    338 
    339 	(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
    340 	if (killflg) {
    341 		(void)printf("\rbut you'll have to do it yourself\r\n");
    342 		finish(0);
    343 	}
    344 	if (dofast)
    345 		doitfast();
    346 	if (doreboot || dohalt) {
    347 		char *args[8], **arg, *path;
    348 
    349 		arg = &args[0];
    350 		if (doreboot) {
    351 			path = _PATH_REBOOT;
    352 			*arg++ = "reboot";
    353 		} else {
    354 			path = _PATH_HALT;
    355 			*arg++ = "halt";
    356 		}
    357 		if (dodump)
    358 			*arg++ = "-d";
    359 		if (nosync)
    360 			*arg++ = "-n";
    361 		*arg++ = "-l";
    362 		*arg++ = 0;
    363 #ifndef DEBUG
    364 		exect(path, args, (char **)0);
    365 		syslog(LOG_ERR, "shutdown: can't exec %s: %m", path);
    366 		perror("shutdown");
    367 #else
    368 		printf("%s", path);
    369 		for (arg = &args[0]; *arg; arg++)
    370 			printf(" %s", *arg);
    371 		printf("\n");
    372 #endif
    373 	} else {
    374 #ifndef DEBUG
    375 		(void)kill(1, SIGTERM);		/* to single user */
    376 #else
    377 		printf("kill 1\n");
    378 #endif
    379 	}
    380 	finish(0);
    381 }
    382 
    383 #define	ATOI2(s)	((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
    384 
    385 void
    386 getoffset(timearg)
    387 	char *timearg;
    388 {
    389 	struct tm *lt;
    390 	char *p;
    391 	time_t now;
    392 	int yearset;
    393 
    394 	if (!strcasecmp(timearg, "now")) {		/* now */
    395 		offset = 0;
    396 		return;
    397 	}
    398 
    399 	(void)time(&now);
    400 	if (*timearg == '+') {				/* +minutes */
    401 		if (!isdigit(*++timearg))
    402 			badtime();
    403 		offset = atoi(timearg) * 60;
    404 		shuttime = now + offset;
    405 		return;
    406 	}
    407 
    408 	/* handle hh:mm by getting rid of the colon */
    409 	for (p = timearg; *p; ++p)
    410 		if (!isascii(*p) || !isdigit(*p))
    411 			if (*p == ':' && strlen(p) == 3) {
    412 				p[0] = p[1];
    413 				p[1] = p[2];
    414 				p[2] = '\0';
    415 			}
    416 			else
    417 				badtime();
    418 
    419 	unsetenv("TZ");					/* OUR timezone */
    420 	lt = localtime(&now);				/* current time val */
    421 
    422 	lt->tm_sec = 0;
    423 
    424 	yearset = 0;
    425 	switch (strlen(timearg)) {
    426 	case 12:
    427 		lt->tm_year = ATOI2(timearg) * 100 - TM_YEAR_BASE;
    428 		yearset = 1;
    429 		/* FALLTHROUGH */
    430 	case 10:
    431 		if (yearset) {
    432 			lt->tm_year += ATOI2(timearg);
    433 		} else {
    434 			yearset = ATOI2(timearg);
    435 			if (yearset < 69)
    436 				lt->tm_year = yearset + 2000 - TM_YEAR_BASE;
    437 			else
    438 				lt->tm_year = yearset + 1900 - TM_YEAR_BASE;
    439 		}
    440 		/* FALLTHROUGH */
    441 	case 8:
    442 		lt->tm_mon = ATOI2(timearg);
    443 		--lt->tm_mon;
    444 		/* FALLTHROUGH */
    445 	case 6:
    446 		lt->tm_mday = ATOI2(timearg);
    447 		/* FALLTHROUGH */
    448 	case 4:
    449 		lt->tm_hour = ATOI2(timearg);
    450 		/* FALLTHROUGH */
    451 	case 2:
    452 		lt->tm_min = ATOI2(timearg);
    453 		break;
    454 	default:
    455 		badtime();
    456 	}
    457 
    458 	if ((shuttime = mktime(lt)) == -1)
    459 		badtime();
    460 	if ((offset = shuttime - now) < 0)
    461 		errx(1, "time is already past");
    462 }
    463 
    464 #define	FSMSG	"fastboot file for fsck\n"
    465 void
    466 doitfast()
    467 {
    468 	int fastfd;
    469 
    470 	if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC,
    471 	    0664)) >= 0) {
    472 		(void)write(fastfd, FSMSG, sizeof(FSMSG) - 1);
    473 		(void)close(fastfd);
    474 	}
    475 }
    476 
    477 #define	NOMSG	"\n\nNO LOGINS: System going down at "
    478 void
    479 nolog()
    480 {
    481 	int logfd;
    482 	char *ct;
    483 
    484 	(void)unlink(_PATH_NOLOGIN);	/* in case linked to another file */
    485 	(void)signal(SIGINT, finish);
    486 	(void)signal(SIGHUP, finish);
    487 	(void)signal(SIGQUIT, finish);
    488 	(void)signal(SIGTERM, finish);
    489 	if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
    490 	    0664)) >= 0) {
    491 		(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
    492 		ct = ctime(&shuttime);
    493 		(void)write(logfd, ct + 11, 5);
    494 		(void)write(logfd, "\n\n", 2);
    495 		(void)write(logfd, mbuf, strlen(mbuf));
    496 		(void)close(logfd);
    497 	}
    498 }
    499 
    500 void
    501 finish(signo)
    502 	int signo;
    503 {
    504 	if (!killflg)
    505 		(void)unlink(_PATH_NOLOGIN);
    506 	exit(0);
    507 }
    508 
    509 void
    510 badtime()
    511 {
    512 	warnx("illegal time format");
    513 	usage();
    514 }
    515 
    516 void
    517 usage()
    518 {
    519 	(void)fprintf(stderr,
    520 	    "usage: shutdown [-dfhknr] time [message ... | -]\n");
    521 	exit(1);
    522 }
    523