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shutdown.c revision 1.11 
      1 /*	$NetBSD: shutdown.c,v 1.11 1997/01/23 05:48:06 mikel 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 #ifndef lint
     37 static char copyright[] =
     38 "@(#) 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	8.2 (Berkeley) 2/16/94";
     45 #else
     46 static char rcsid[] = "$NetBSD: shutdown.c,v 1.11 1997/01/23 05:48:06 mikel 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 <fcntl.h>
     57 #include <pwd.h>
     58 #include <setjmp.h>
     59 #include <signal.h>
     60 #include <stdio.h>
     61 #include <stdlib.h>
     62 #include <string.h>
     63 #include <tzfile.h>
     64 #include <unistd.h>
     65 
     66 #include "pathnames.h"
     67 
     68 #ifdef DEBUG
     69 #undef _PATH_NOLOGIN
     70 #define	_PATH_NOLOGIN	"./nologin"
     71 #undef _PATH_FASTBOOT
     72 #define	_PATH_FASTBOOT	"./fastboot"
     73 #endif
     74 
     75 #define	H		*60*60
     76 #define	M		*60
     77 #define	S		*1
     78 #define	NOLOG_TIME	5*60
     79 struct interval {
     80 	int timeleft, timetowait;
     81 } tlist[] = {
     82 	10 H,  5 H,	 5 H,  3 H,	 2 H,  1 H,	1 H, 30 M,
     83 	30 M, 10 M,	20 M, 10 M,	10 M,  5 M,	5 M,  3 M,
     84 	 2 M,  1 M,	 1 M, 30 S,	30 S, 30 S,
     85 	 0, 0,
     86 };
     87 #undef H
     88 #undef M
     89 #undef S
     90 
     91 static time_t offset, shuttime;
     92 static int dofast, dohalt, doreboot, killflg, mbuflen, nosync;
     93 static char *whom, mbuf[BUFSIZ];
     94 
     95 void badtime __P((void));
     96 void die_you_gravy_sucking_pig_dog __P((void));
     97 void doitfast __P((void));
     98 void finish __P((int));
     99 void getoffset __P((char *));
    100 void loop __P((void));
    101 void nolog __P((void));
    102 void timeout __P((int));
    103 void timewarn __P((int));
    104 void usage __P((void));
    105 
    106 int
    107 main(argc, argv)
    108 	int argc;
    109 	char *argv[];
    110 {
    111 	extern int optind;
    112 	register char *p, *endp;
    113 	struct passwd *pw;
    114 	int arglen, ch, len, readstdin;
    115 
    116 #ifndef DEBUG
    117 	if (geteuid()) {
    118 		(void)fprintf(stderr, "shutdown: NOT super-user\n");
    119 		exit(1);
    120 	}
    121 #endif
    122 	readstdin = 0;
    123 	while ((ch = getopt(argc, argv, "-fhknr")) != EOF)
    124 		switch (ch) {
    125 		case '-':
    126 			readstdin = 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 (dofast && nosync) {
    154 		(void)fprintf(stderr,
    155 		    "shutdown: incompatible switches -f and -n.\n");
    156 		usage();
    157 	}
    158 	if (doreboot && dohalt) {
    159 		(void)fprintf(stderr,
    160 		    "shutdown: incompatible switches -h and -r.\n");
    161 		usage();
    162 	}
    163 	getoffset(*argv++);
    164 
    165 	if (*argv) {
    166 		for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
    167 			arglen = strlen(*argv);
    168 			if ((len -= arglen) <= 2)
    169 				break;
    170 			if (p != mbuf)
    171 				*p++ = ' ';
    172 			memcpy(p, *argv, arglen);
    173 			p += arglen;
    174 		}
    175 		*p = '\n';
    176 		*++p = '\0';
    177 	}
    178 
    179 	if (readstdin) {
    180 		p = mbuf;
    181 		endp = mbuf + sizeof(mbuf) - 2;
    182 		for (;;) {
    183 			if (!fgets(p, endp - p + 1, stdin))
    184 				break;
    185 			for (; *p &&  p < endp; ++p);
    186 			if (p == endp) {
    187 				*p = '\n';
    188 				*++p = '\0';
    189 				break;
    190 			}
    191 		}
    192 	}
    193 	mbuflen = strlen(mbuf);
    194 
    195 	if (offset)
    196 		(void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
    197 	else
    198 		(void)printf("Shutdown NOW!\n");
    199 
    200 	if (!(whom = getlogin()))
    201 		whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
    202 
    203 #ifdef DEBUG
    204 	(void)putc('\n', stdout);
    205 #else
    206 	(void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
    207 	{
    208 		int forkpid;
    209 
    210 		forkpid = fork();
    211 		if (forkpid == -1) {
    212 			perror("shutdown: fork");
    213 			exit(1);
    214 		}
    215 		if (forkpid) {
    216 			(void)printf("shutdown: [pid %d]\n", forkpid);
    217 			exit(0);
    218 		}
    219 	}
    220 #endif
    221 	openlog("shutdown", LOG_CONS, LOG_AUTH);
    222 	loop();
    223 	/* NOTREACHED */
    224 }
    225 
    226 void
    227 loop()
    228 {
    229 	struct interval *tp;
    230 	u_int sltime;
    231 	int logged;
    232 
    233 	if (offset <= NOLOG_TIME) {
    234 		logged = 1;
    235 		nolog();
    236 	}
    237 	else
    238 		logged = 0;
    239 	tp = tlist;
    240 	if (tp->timeleft < offset)
    241 		(void)sleep((u_int)(offset - tp->timeleft));
    242 	else {
    243 		while (offset < tp->timeleft)
    244 			++tp;
    245 		/*
    246 		 * Warn now, if going to sleep more than a fifth of
    247 		 * the next wait time.
    248 		 */
    249 		if (sltime = offset - tp->timeleft) {
    250 			if (sltime > tp->timetowait / 5)
    251 				timewarn(offset);
    252 			(void)sleep(sltime);
    253 		}
    254 	}
    255 	for (;; ++tp) {
    256 		timewarn(tp->timeleft);
    257 		if (!logged && tp->timeleft <= NOLOG_TIME) {
    258 			logged = 1;
    259 			nolog();
    260 		}
    261 		(void)sleep((u_int)tp->timetowait);
    262 		if (!tp->timeleft)
    263 			break;
    264 	}
    265 	die_you_gravy_sucking_pig_dog();
    266 }
    267 
    268 static jmp_buf alarmbuf;
    269 
    270 void
    271 timewarn(timeleft)
    272 	int timeleft;
    273 {
    274 	static int first;
    275 	static char hostname[MAXHOSTNAMELEN + 1];
    276 	FILE *pf;
    277 	char wcmd[MAXPATHLEN + 4];
    278 
    279 	if (!first++)
    280 		(void)gethostname(hostname, sizeof(hostname));
    281 
    282 	/* undoc -n option to wall suppresses normal wall banner */
    283 	(void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL);
    284 	if (!(pf = popen(wcmd, "w"))) {
    285 		syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
    286 		return;
    287 	}
    288 
    289 	(void)fprintf(pf,
    290 	    "\007*** %sSystem shutdown message from %s@%s ***\007\n",
    291 	    timeleft ? "": "FINAL ", whom, hostname);
    292 
    293 	if (timeleft > 10*60)
    294 		(void)fprintf(pf, "System going down at %5.5s\n\n",
    295 		    ctime(&shuttime) + 11);
    296 	else if (timeleft > 59)
    297 		(void)fprintf(pf, "System going down in %d minute%s\n\n",
    298 		    timeleft / 60, (timeleft > 60) ? "s" : "");
    299 	else if (timeleft)
    300 		(void)fprintf(pf, "System going down in 30 seconds\n\n");
    301 	else
    302 		(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
    303 
    304 	if (mbuflen)
    305 		(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
    306 
    307 	/*
    308 	 * play some games, just in case wall doesn't come back
    309 	 * probably unecessary, given that wall is careful.
    310 	 */
    311 	if (!setjmp(alarmbuf)) {
    312 		(void)signal(SIGALRM, timeout);
    313 		(void)alarm((u_int)30);
    314 		(void)pclose(pf);
    315 		(void)alarm((u_int)0);
    316 		(void)signal(SIGALRM, SIG_DFL);
    317 	}
    318 }
    319 
    320 void
    321 timeout(signo)
    322 	int signo;
    323 {
    324 	longjmp(alarmbuf, 1);
    325 }
    326 
    327 void
    328 die_you_gravy_sucking_pig_dog()
    329 {
    330 
    331 	syslog(LOG_NOTICE, "%s by %s: %s",
    332 	    doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf);
    333 	(void)sleep(2);
    334 
    335 	(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
    336 	if (killflg) {
    337 		(void)printf("\rbut you'll have to do it yourself\r\n");
    338 		finish(0);
    339 	}
    340 	if (dofast)
    341 		doitfast();
    342 #ifdef DEBUG
    343 	if (doreboot)
    344 		(void)printf("reboot");
    345 	else if (dohalt)
    346 		(void)printf("halt");
    347 	if (nosync)
    348 		(void)printf(" no sync");
    349 	if (dofast)
    350 		(void)printf(" no fsck");
    351 	(void)printf("\nkill -HUP 1\n");
    352 #else
    353 	if (doreboot) {
    354 		execle(_PATH_REBOOT, "reboot", nosync ? "-ln" : "-l",
    355 		    (char *)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 	register char *timearg;
    375 {
    376 	register struct tm *lt;
    377 	register char *p;
    378 	time_t now;
    379 
    380 	if (!strcasecmp(timearg, "now")) {		/* now */
    381 		offset = 0;
    382 		return;
    383 	}
    384 
    385 	(void)time(&now);
    386 	if (*timearg == '+') {				/* +minutes */
    387 		if (!isdigit(*++timearg))
    388 			badtime();
    389 		offset = atoi(timearg) * 60;
    390 		shuttime = now + offset;
    391 		return;
    392 	}
    393 
    394 	/* handle hh:mm by getting rid of the colon */
    395 	for (p = timearg; *p; ++p)
    396 		if (!isascii(*p) || !isdigit(*p))
    397 			if (*p == ':' && strlen(p) == 3) {
    398 				p[0] = p[1];
    399 				p[1] = p[2];
    400 				p[2] = '\0';
    401 			}
    402 			else
    403 				badtime();
    404 
    405 	unsetenv("TZ");					/* OUR timezone */
    406 	lt = localtime(&now);				/* current time val */
    407 
    408 	switch(strlen(timearg)) {
    409 	case 10:
    410 		lt->tm_year = ATOI2(timearg);
    411 		/* FALLTHROUGH */
    412 	case 8:
    413 		lt->tm_mon = ATOI2(timearg);
    414 		if (--lt->tm_mon < 0 || lt->tm_mon > 11)
    415 			badtime();
    416 		/* FALLTHROUGH */
    417 	case 6:
    418 		lt->tm_mday = ATOI2(timearg);
    419 		if (lt->tm_mday < 1 || lt->tm_mday > 31)
    420 			badtime();
    421 		/* FALLTHROUGH */
    422 	case 4:
    423 		lt->tm_hour = ATOI2(timearg);
    424 		if (lt->tm_hour < 0 || lt->tm_hour > 23)
    425 			badtime();
    426 		lt->tm_min = ATOI2(timearg);
    427 		if (lt->tm_min < 0 || lt->tm_min > 59)
    428 			badtime();
    429 		lt->tm_sec = 0;
    430 		if ((shuttime = mktime(lt)) == -1)
    431 			badtime();
    432 		if ((offset = shuttime - now) < 0) {
    433 			(void)fprintf(stderr,
    434 			    "shutdown: that time is already past.\n");
    435 			exit(1);
    436 		}
    437 		break;
    438 	default:
    439 		badtime();
    440 	}
    441 }
    442 
    443 #define	FSMSG	"fastboot file for fsck\n"
    444 void
    445 doitfast()
    446 {
    447 	int fastfd;
    448 
    449 	if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC,
    450 	    0664)) >= 0) {
    451 		(void)write(fastfd, FSMSG, sizeof(FSMSG) - 1);
    452 		(void)close(fastfd);
    453 	}
    454 }
    455 
    456 #define	NOMSG	"\n\nNO LOGINS: System going down at "
    457 void
    458 nolog()
    459 {
    460 	int logfd;
    461 	char *ct;
    462 
    463 	(void)unlink(_PATH_NOLOGIN);	/* in case linked to another file */
    464 	(void)signal(SIGINT, finish);
    465 	(void)signal(SIGHUP, finish);
    466 	(void)signal(SIGQUIT, finish);
    467 	(void)signal(SIGTERM, finish);
    468 	if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
    469 	    0664)) >= 0) {
    470 		(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
    471 		ct = ctime(&shuttime);
    472 		(void)write(logfd, ct + 11, 5);
    473 		(void)write(logfd, "\n\n", 2);
    474 		(void)write(logfd, mbuf, strlen(mbuf));
    475 		(void)close(logfd);
    476 	}
    477 }
    478 
    479 void
    480 finish(signo)
    481 	int signo;
    482 {
    483 	if (!killflg)
    484 		(void)unlink(_PATH_NOLOGIN);
    485 	exit(0);
    486 }
    487 
    488 void
    489 badtime()
    490 {
    491 	(void)fprintf(stderr, "shutdown: bad time format.\n");
    492 	exit(1);
    493 }
    494 
    495 void
    496 usage()
    497 {
    498 	fprintf(stderr, "usage: shutdown [-fhknr] shutdowntime [ message ]\n");
    499 	exit(1);
    500 }
    501