Home | History | Annotate | Line # | Download | only in shutdown
shutdown.c revision 1.19 
      1 /*	$NetBSD: shutdown.c,v 1.19 1998/01/20 22:30:15 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 1.19 1998/01/20 22:30:15 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 (dofast && nosync) {
    152 		warnx("incompatible switches -f and -n\n");
    153 		usage();
    154 	}
    155 	if (doreboot && dohalt) {
    156 		warnx("incompatible switches -h and -r\n");
    157 		usage();
    158 	}
    159 
    160 	getoffset(*argv++);
    161 
    162 	if (*argv)
    163 		if (strcmp(*argv, "-")) {
    164 			for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
    165 				arglen = strlen(*argv);
    166 				if ((len -= arglen) <= 2)
    167 					break;
    168 				if (p != mbuf)
    169 					*p++ = ' ';
    170 				memmove(p, *argv, arglen);
    171 				p += arglen;
    172 			}
    173 			*p = '\n';
    174 			*++p = '\0';
    175 		} else {
    176 			p = mbuf;
    177 			endp = mbuf + sizeof(mbuf) - 2;
    178 			for (;;) {
    179 				if (!fgets(p, endp - p + 1, stdin))
    180 					break;
    181 				for (; *p &&  p < endp; ++p);
    182 				if (p == endp) {
    183 					*p = '\n';
    184 					*++p = '\0';
    185 					break;
    186 				}
    187 			}
    188 		}
    189 	mbuflen = strlen(mbuf);
    190 
    191 	if (offset)
    192 		(void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
    193 	else
    194 		(void)printf("Shutdown NOW!\n");
    195 
    196 	if (!(whom = getlogin()))
    197 		whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
    198 
    199 #ifdef DEBUG
    200 	(void)putc('\n', stdout);
    201 #else
    202 	(void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
    203 	{
    204 		int forkpid;
    205 
    206 		forkpid = fork();
    207 		if (forkpid == -1) {
    208 			perror("shutdown: fork");
    209 			exit(1);
    210 		}
    211 		if (forkpid) {
    212 			(void)printf("shutdown: [pid %d]\n", forkpid);
    213 			exit(0);
    214 		}
    215 	}
    216 #endif
    217 	openlog("shutdown", LOG_CONS, LOG_AUTH);
    218 	loop();
    219 	/* NOTREACHED */
    220 #ifdef __GNUC__
    221 	return 1;
    222 #endif
    223 }
    224 
    225 void
    226 loop()
    227 {
    228 	struct interval *tp;
    229 	u_int sltime;
    230 	int logged;
    231 
    232 	if (offset <= NOLOG_TIME) {
    233 		logged = 1;
    234 		nolog();
    235 	}
    236 	else
    237 		logged = 0;
    238 	tp = tlist;
    239 	if (tp->timeleft < offset)
    240 		(void)sleep((u_int)(offset - tp->timeleft));
    241 	else {
    242 		while (offset < tp->timeleft)
    243 			++tp;
    244 		/*
    245 		 * Warn now, if going to sleep more than a fifth of
    246 		 * the next wait time.
    247 		 */
    248 		if ((sltime = offset - tp->timeleft) != 0) {
    249 			if (sltime > tp->timetowait / 5)
    250 				timewarn(offset);
    251 			(void)sleep(sltime);
    252 		}
    253 	}
    254 	for (;; ++tp) {
    255 		timewarn(tp->timeleft);
    256 		if (!logged && tp->timeleft <= NOLOG_TIME) {
    257 			logged = 1;
    258 			nolog();
    259 		}
    260 		(void)sleep((u_int)tp->timetowait);
    261 		if (!tp->timeleft)
    262 			break;
    263 	}
    264 	die_you_gravy_sucking_pig_dog();
    265 }
    266 
    267 static jmp_buf alarmbuf;
    268 
    269 void
    270 timewarn(timeleft)
    271 	int timeleft;
    272 {
    273 	static int first;
    274 	static char hostname[MAXHOSTNAMELEN + 1];
    275 	FILE *pf;
    276 	char wcmd[MAXPATHLEN + 4];
    277 
    278 	if (!first++)
    279 		(void)gethostname(hostname, sizeof(hostname));
    280 
    281 	/* undoc -n option to wall suppresses normal wall banner */
    282 	(void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL);
    283 	if (!(pf = popen(wcmd, "w"))) {
    284 		syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
    285 		return;
    286 	}
    287 
    288 	(void)fprintf(pf,
    289 	    "\007*** %sSystem shutdown message from %s@%s ***\007\n",
    290 	    timeleft ? "": "FINAL ", whom, hostname);
    291 
    292 	if (timeleft > 10*60)
    293 		(void)fprintf(pf, "System going down at %5.5s\n\n",
    294 		    ctime(&shuttime) + 11);
    295 	else if (timeleft > 59)
    296 		(void)fprintf(pf, "System going down in %d minute%s\n\n",
    297 		    timeleft / 60, (timeleft > 60) ? "s" : "");
    298 	else if (timeleft)
    299 		(void)fprintf(pf, "System going down in 30 seconds\n\n");
    300 	else
    301 		(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
    302 
    303 	if (mbuflen)
    304 		(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
    305 
    306 	/*
    307 	 * play some games, just in case wall doesn't come back
    308 	 * probably unecessary, given that wall is careful.
    309 	 */
    310 	if (!setjmp(alarmbuf)) {
    311 		(void)signal(SIGALRM, timeout);
    312 		(void)alarm((u_int)30);
    313 		(void)pclose(pf);
    314 		(void)alarm((u_int)0);
    315 		(void)signal(SIGALRM, SIG_DFL);
    316 	}
    317 }
    318 
    319 void
    320 timeout(signo)
    321 	int signo;
    322 {
    323 	longjmp(alarmbuf, 1);
    324 }
    325 
    326 void
    327 die_you_gravy_sucking_pig_dog()
    328 {
    329 
    330 	syslog(LOG_NOTICE, "%s by %s: %s",
    331 	    doreboot || dodump ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf);
    332 	(void)sleep(2);
    333 
    334 	(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
    335 	if (killflg) {
    336 		(void)printf("\rbut you'll have to do it yourself\r\n");
    337 		finish(0);
    338 	}
    339 	if (dofast)
    340 		doitfast();
    341 #ifdef DEBUG
    342 	if (doreboot || dodump)
    343 		(void)printf("reboot%s", dodump ? " -d" : "");
    344 	else if (dohalt)
    345 		(void)printf("halt");
    346 	if (nosync)
    347 		(void)printf(" no sync");
    348 	if (dofast)
    349 		(void)printf(" no fsck");
    350 	(void)printf("\nkill -HUP 1\n");
    351 #else
    352 	if (doreboot || dodump) {
    353 		execle(_PATH_REBOOT, "reboot",
    354 		       dodump ? (nosync ? "-ldn" : "-ld") :
    355 		       (nosync ? "-ln" : "-l"), 0, (char **)0);
    356 		syslog(LOG_ERR, "shutdown: can't exec %s: %m", _PATH_REBOOT);
    357 		perror("shutdown");
    358 	}
    359 	else if (dohalt) {
    360 		execle(_PATH_HALT, "halt", nosync ? "-ln" : "-l",
    361 		    (char *)0, (char **)0);
    362 		syslog(LOG_ERR, "shutdown: can't exec %s: %m", _PATH_HALT);
    363 		perror("shutdown");
    364 	}
    365 	(void)kill(1, SIGTERM);		/* to single user */
    366 #endif
    367 	finish(0);
    368 }
    369 
    370 #define	ATOI2(p)	(p[0] - '0') * 10 + (p[1] - '0'); p += 2;
    371 
    372 void
    373 getoffset(timearg)
    374 	char *timearg;
    375 {
    376 	struct tm *lt;
    377 	char *p;
    378 	time_t now;
    379 	int yearset;
    380 
    381 	if (!strcasecmp(timearg, "now")) {		/* now */
    382 		offset = 0;
    383 		return;
    384 	}
    385 
    386 	(void)time(&now);
    387 	if (*timearg == '+') {				/* +minutes */
    388 		if (!isdigit(*++timearg))
    389 			badtime();
    390 		offset = atoi(timearg) * 60;
    391 		shuttime = now + offset;
    392 		return;
    393 	}
    394 
    395 	/* handle hh:mm by getting rid of the colon */
    396 	for (p = timearg; *p; ++p)
    397 		if (!isascii(*p) || !isdigit(*p))
    398 			if (*p == ':' && strlen(p) == 3) {
    399 				p[0] = p[1];
    400 				p[1] = p[2];
    401 				p[2] = '\0';
    402 			}
    403 			else
    404 				badtime();
    405 
    406 	unsetenv("TZ");					/* OUR timezone */
    407 	lt = localtime(&now);				/* current time val */
    408 
    409 	lt->tm_sec = 0;
    410 
    411 	yearset = 0;
    412 	switch (strlen(timearg)) {
    413 	case 12:
    414 		lt->tm_year = ATOI2(timearg);
    415 		lt->tm_year *= 100;
    416 		yearset = 1;
    417 		/* FALLTHROUGH */
    418 	case 10:
    419 		if (yearset) {
    420 			yearset = ATOI2(timearg);
    421 			lt->tm_year += yearset;
    422 		} else {
    423 			yearset = ATOI2(timearg);
    424 			if (yearset < 69)
    425 				lt->tm_year = yearset + 2000;
    426 			else
    427 				lt->tm_year = yearset + 1900;
    428 		}
    429 		lt->tm_year -= TM_YEAR_BASE;
    430 		/* FALLTHROUGH */
    431 	case 8:
    432 		lt->tm_mon = ATOI2(timearg);
    433 		--lt->tm_mon;
    434 		/* FALLTHROUGH */
    435 	case 6:
    436 		lt->tm_mday = ATOI2(timearg);
    437 		/* FALLTHROUGH */
    438 	case 4:
    439 		lt->tm_hour = ATOI2(timearg);
    440 		/* FALLTHROUGH */
    441 	case 2:
    442 		lt->tm_min = ATOI2(timearg);
    443 		break;
    444 	default:
    445 		badtime();
    446 	}
    447 
    448 	if ((shuttime = mktime(lt)) == -1)
    449 		badtime();
    450 	if ((offset = shuttime - now) < 0)
    451 		errx(1, "time is already past");
    452 }
    453 
    454 #define	FSMSG	"fastboot file for fsck\n"
    455 void
    456 doitfast()
    457 {
    458 	int fastfd;
    459 
    460 	if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC,
    461 	    0664)) >= 0) {
    462 		(void)write(fastfd, FSMSG, sizeof(FSMSG) - 1);
    463 		(void)close(fastfd);
    464 	}
    465 }
    466 
    467 #define	NOMSG	"\n\nNO LOGINS: System going down at "
    468 void
    469 nolog()
    470 {
    471 	int logfd;
    472 	char *ct;
    473 
    474 	(void)unlink(_PATH_NOLOGIN);	/* in case linked to another file */
    475 	(void)signal(SIGINT, finish);
    476 	(void)signal(SIGHUP, finish);
    477 	(void)signal(SIGQUIT, finish);
    478 	(void)signal(SIGTERM, finish);
    479 	if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
    480 	    0664)) >= 0) {
    481 		(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
    482 		ct = ctime(&shuttime);
    483 		(void)write(logfd, ct + 11, 5);
    484 		(void)write(logfd, "\n\n", 2);
    485 		(void)write(logfd, mbuf, strlen(mbuf));
    486 		(void)close(logfd);
    487 	}
    488 }
    489 
    490 void
    491 finish(signo)
    492 	int signo;
    493 {
    494 	if (!killflg)
    495 		(void)unlink(_PATH_NOLOGIN);
    496 	exit(0);
    497 }
    498 
    499 void
    500 badtime()
    501 {
    502 	warnx("illegal time format");
    503 	usage();
    504 }
    505 
    506 void
    507 usage()
    508 {
    509 	(void)fprintf(stderr,
    510 	    "usage: shutdown [-dfhknr] [[[[[cc]yy]mm]dd]hh]mm [message|-]\n");
    511 	(void)fprintf(stderr,
    512 	    "       shutdown [-dfhknr] +time [message|-]\n");
    513 	exit(1);
    514 }
    515