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shutdown.c revision 1.6 
      1 /*
      2  * Copyright (c) 1988, 1990 Regents of the University of California.
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 char copyright[] =
     36 "@(#) Copyright (c) 1988 Regents of the University of California.\n\
     37  All rights reserved.\n";
     38 #endif /* not lint */
     39 
     40 #ifndef lint
     41 /*static char sccsid[] = "from: @(#)shutdown.c	5.16 (Berkeley) 2/3/91";*/
     42 static char rcsid[] = "$Id: shutdown.c,v 1.6 1994/09/17 00:02:23 mycroft Exp $";
     43 #endif /* not lint */
     44 
     45 #include <sys/param.h>
     46 #include <sys/time.h>
     47 #include <sys/file.h>
     48 #include <sys/resource.h>
     49 #include <sys/syslog.h>
     50 #include <sys/signal.h>
     51 #include <setjmp.h>
     52 #include <tzfile.h>
     53 #include <pwd.h>
     54 #include <stdio.h>
     55 #include <ctype.h>
     56 #include "pathnames.h"
     57 
     58 #ifdef DEBUG
     59 #undef _PATH_NOLOGIN
     60 #define	_PATH_NOLOGIN	"./nologin"
     61 #undef _PATH_FASTBOOT
     62 #define	_PATH_FASTBOOT	"./fastboot"
     63 #endif
     64 
     65 #define	H		*60*60
     66 #define	M		*60
     67 #define	S		*1
     68 #define	NOLOG_TIME	5*60
     69 struct interval {
     70 	int timeleft, timetowait;
     71 } tlist[] = {
     72 	10 H,  5 H,	 5 H,  3 H,	 2 H,  1 H,	1 H, 30 M,
     73 	30 M, 10 M,	20 M, 10 M,	10 M,  5 M,	5 M,  3 M,
     74 	 2 M,  1 M,	 1 M, 30 S,	30 S, 30 S,
     75 	 0, 0,
     76 }, *tp = tlist;
     77 #undef H
     78 #undef M
     79 #undef S
     80 
     81 static time_t offset, shuttime;
     82 static int dofast, dohalt, doreboot, killflg, mbuflen;
     83 static char *nosync, *whom, mbuf[BUFSIZ];
     84 
     85 int warn __P((int));
     86 
     87 main(argc, argv)
     88 	int argc;
     89 	char **argv;
     90 {
     91 	extern int optind;
     92 	register char *p, *endp;
     93 	int arglen, ch, len, readstdin;
     94 	struct passwd *pw;
     95 	char *strcat(), *getlogin();
     96 	uid_t geteuid();
     97 
     98 #ifndef DEBUG
     99 	if (geteuid()) {
    100 		(void)fprintf(stderr, "shutdown: NOT super-user\n");
    101 		exit(1);
    102 	}
    103 #endif
    104 	nosync = NULL;
    105 	readstdin = 0;
    106 	while ((ch = getopt(argc, argv, "-fhknr")) != EOF)
    107 		switch (ch) {
    108 		case '-':
    109 			readstdin = 1;
    110 			break;
    111 		case 'f':
    112 			dofast = 1;
    113 			break;
    114 		case 'h':
    115 			dohalt = 1;
    116 			break;
    117 		case 'k':
    118 			killflg = 1;
    119 			break;
    120 		case 'n':
    121 			nosync = "-n";
    122 			break;
    123 		case 'r':
    124 			doreboot = 1;
    125 			break;
    126 		case '?':
    127 		default:
    128 			usage();
    129 		}
    130 	argc -= optind;
    131 	argv += optind;
    132 
    133 	if (argc < 1)
    134 		usage();
    135 
    136 	if (dofast && nosync) {
    137 		(void)fprintf(stderr,
    138 		    "shutdown: incompatible switches -f and -n.\n");
    139 		usage();
    140 	}
    141 	if (doreboot && dohalt) {
    142 		(void)fprintf(stderr,
    143 		    "shutdown: incompatible switches -h and -r.\n");
    144 		usage();
    145 	}
    146 	getoffset(*argv++);
    147 
    148 	if (*argv) {
    149 		for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
    150 			arglen = strlen(*argv);
    151 			if ((len -= arglen) <= 2)
    152 				break;
    153 			if (p != mbuf)
    154 				*p++ = ' ';
    155 			bcopy(*argv, p, arglen);
    156 			p += arglen;
    157 		}
    158 		*p = '\n';
    159 		*++p = '\0';
    160 	}
    161 
    162 	if (readstdin) {
    163 		p = mbuf;
    164 		endp = mbuf + sizeof(mbuf) - 2;
    165 		for (;;) {
    166 			if (!fgets(p, endp - p + 1, stdin))
    167 				break;
    168 			for (; *p &&  p < endp; ++p);
    169 			if (p == endp) {
    170 				*p = '\n';
    171 				*++p = '\0';
    172 				break;
    173 			}
    174 		}
    175 	}
    176 	mbuflen = strlen(mbuf);
    177 
    178 	if (offset)
    179 		(void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
    180 	else
    181 		(void)printf("Shutdown NOW!\n");
    182 
    183 	if (!(whom = getlogin()))
    184 		whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
    185 
    186 #ifdef DEBUG
    187 	(void)putc('\n', stdout);
    188 #else
    189 	(void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
    190 	{
    191 		int forkpid;
    192 
    193 		forkpid = fork();
    194 		if (forkpid == -1) {
    195 			perror("shutdown: fork");
    196 			exit(1);
    197 		}
    198 		if (forkpid) {
    199 			(void)printf("shutdown: [pid %d]\n", forkpid);
    200 			exit(0);
    201 		}
    202 	}
    203 #endif
    204 	openlog("shutdown", LOG_CONS, LOG_AUTH);
    205 	loop();
    206 	/*NOTREACHED*/
    207 }
    208 
    209 loop()
    210 {
    211 	u_int sltime;
    212 	int logged;
    213 
    214 	if (offset <= NOLOG_TIME) {
    215 		logged = 1;
    216 		nolog();
    217 	}
    218 	else
    219 		logged = 0;
    220 	tp = tlist;
    221 	if (tp->timeleft < offset)
    222 		(void)sleep((u_int)(offset - tp->timeleft));
    223 	else {
    224 		while (offset < tp->timeleft)
    225 			++tp;
    226 		/*
    227 		 * warn now, if going to sleep more than a fifth of
    228 		 * the next wait time.
    229 		 */
    230 		if (sltime = offset - tp->timeleft) {
    231 			if (sltime > tp->timetowait / 5)
    232 				warn(offset);
    233 			(void)sleep(sltime);
    234 		}
    235 	}
    236 	for (;; ++tp) {
    237 		warn(tp->timeleft);
    238 		if (!logged && tp->timeleft <= NOLOG_TIME) {
    239 			logged = 1;
    240 			nolog();
    241 		}
    242 		(void)sleep((u_int)tp->timetowait);
    243 		if (!tp->timeleft)
    244 			break;
    245 	}
    246 	die_you_gravy_sucking_pig_dog();
    247 }
    248 
    249 static jmp_buf alarmbuf;
    250 
    251 warn(timeleft)
    252 	int timeleft;
    253 {
    254 	static int first;
    255 	static char hostname[MAXHOSTNAMELEN + 1];
    256 	char wcmd[MAXPATHLEN + 4];
    257 	FILE *pf;
    258 	char *ctime();
    259 	void timeout();
    260 
    261 	if (!first++)
    262 		(void)gethostname(hostname, sizeof(hostname));
    263 
    264 	/* undoc -n option to wall suppresses normal wall banner */
    265 	(void)sprintf(wcmd, "%s -n", _PATH_WALL);
    266 	if (!(pf = popen(wcmd, "w"))) {
    267 		syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
    268 		return;
    269 	}
    270 
    271 	(void)fprintf(pf,
    272 	    "\007*** %sSystem shutdown message from %s@%s ***\007\n",
    273 	    timeleft ? "": "FINAL ", whom, hostname);
    274 
    275 	if (timeleft > 10*60)
    276 		(void)fprintf(pf, "System going down at %5.5s\n\n",
    277 		    ctime(&shuttime) + 11);
    278 	else if (timeleft > 59)
    279 		(void)fprintf(pf, "System going down in %d minute%s\n\n",
    280 		    timeleft / 60, (timeleft > 60) ? "s" : "");
    281 	else if (timeleft)
    282 		(void)fprintf(pf, "System going down in 30 seconds\n\n");
    283 	else
    284 		(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
    285 
    286 	if (mbuflen)
    287 		(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
    288 
    289 	/*
    290 	 * play some games, just in case wall doesn't come back
    291 	 * probably unecessary, given that wall is careful.
    292 	 */
    293 	if (!setjmp(alarmbuf)) {
    294 		(void)signal(SIGALRM, timeout);
    295 		(void)alarm((u_int)30);
    296 		(void)pclose(pf);
    297 		(void)alarm((u_int)0);
    298 		(void)signal(SIGALRM, SIG_DFL);
    299 	}
    300 }
    301 
    302 void
    303 timeout()
    304 {
    305 	longjmp(alarmbuf, 1);
    306 }
    307 
    308 die_you_gravy_sucking_pig_dog()
    309 {
    310 	void finish();
    311 
    312 	syslog(LOG_NOTICE, "%s by %s: %s",
    313 	    doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf);
    314 	(void)sleep(2);
    315 
    316 	(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
    317 	if (killflg) {
    318 		(void)printf("\rbut you'll have to do it yourself\r\n");
    319 		finish();
    320 	}
    321 	if (dofast)
    322 		doitfast();
    323 #ifdef DEBUG
    324 	if (doreboot)
    325 		(void)printf("reboot");
    326 	else if (dohalt)
    327 		(void)printf("halt");
    328 	if (nosync)
    329 		(void)printf(" no sync");
    330 	if (dofast)
    331 		(void)printf(" no fsck");
    332 	(void)printf("\nkill -HUP 1\n");
    333 #else
    334 	if (doreboot) {
    335 		execle(_PATH_REBOOT, "reboot", "-l", nosync, 0);
    336 		syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_REBOOT);
    337 		perror("shutdown");
    338 	}
    339 	else if (dohalt) {
    340 		execle(_PATH_HALT, "halt", "-l", nosync, 0);
    341 		syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_HALT);
    342 		perror("shutdown");
    343 	}
    344 	(void)kill(1, SIGTERM);		/* to single user */
    345 #endif
    346 	finish();
    347 }
    348 
    349 #define	ATOI2(p)	(p[0] - '0') * 10 + (p[1] - '0'); p += 2;
    350 
    351 getoffset(timearg)
    352 	register char *timearg;
    353 {
    354 	register struct tm *lt;
    355 	register char *p;
    356 	time_t now, time();
    357 
    358 	if (!strcasecmp(timearg, "now")) {		/* now */
    359 		offset = 0;
    360 		return;
    361 	}
    362 
    363 	(void)time(&now);
    364 	if (*timearg == '+') {				/* +minutes */
    365 		if (!isdigit(*++timearg))
    366 			badtime();
    367 		offset = atoi(timearg) * 60;
    368 		shuttime = now + offset;
    369 		return;
    370 	}
    371 
    372 	/* handle hh:mm by getting rid of the colon */
    373 	for (p = timearg; *p; ++p)
    374 		if (!isascii(*p) || !isdigit(*p))
    375 			if (*p == ':' && strlen(p) == 3) {
    376 				p[0] = p[1];
    377 				p[1] = p[2];
    378 				p[2] = '\0';
    379 			}
    380 			else
    381 				badtime();
    382 
    383 	unsetenv("TZ");					/* OUR timezone */
    384 	lt = localtime(&now);				/* current time val */
    385 
    386 	switch(strlen(timearg)) {
    387 	case 10:
    388 		lt->tm_year = ATOI2(timearg);
    389 		/* FALLTHROUGH */
    390 	case 8:
    391 		lt->tm_mon = ATOI2(timearg);
    392 		if (--lt->tm_mon < 0 || lt->tm_mon > 11)
    393 			badtime();
    394 		/* FALLTHROUGH */
    395 	case 6:
    396 		lt->tm_mday = ATOI2(timearg);
    397 		if (lt->tm_mday < 1 || lt->tm_mday > 31)
    398 			badtime();
    399 		/* FALLTHROUGH */
    400 	case 4:
    401 		lt->tm_hour = ATOI2(timearg);
    402 		if (lt->tm_hour < 0 || lt->tm_hour > 23)
    403 			badtime();
    404 		lt->tm_min = ATOI2(timearg);
    405 		if (lt->tm_min < 0 || lt->tm_min > 59)
    406 			badtime();
    407 		lt->tm_sec = 0;
    408 		if ((shuttime = mktime(lt)) == -1)
    409 			badtime();
    410 		if ((offset = shuttime - now) < 0) {
    411 			(void)fprintf(stderr,
    412 			    "shutdown: that time is already past.\n");
    413 			exit(1);
    414 		}
    415 		break;
    416 	default:
    417 		badtime();
    418 	}
    419 }
    420 
    421 #define	FSMSG	"fastboot file for fsck\n"
    422 doitfast()
    423 {
    424 	int fastfd;
    425 
    426 	if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC,
    427 	    0664)) >= 0) {
    428 		(void)write(fastfd, FSMSG, sizeof(FSMSG) - 1);
    429 		(void)close(fastfd);
    430 	}
    431 }
    432 
    433 #define	NOMSG	"\n\nNO LOGINS: System going down at "
    434 nolog()
    435 {
    436 	int logfd;
    437 	char *ct, *ctime();
    438 
    439 	(void)unlink(_PATH_NOLOGIN);	/* in case linked to another file */
    440 	(void)signal(SIGINT, finish);
    441 	(void)signal(SIGHUP, finish);
    442 	(void)signal(SIGQUIT, finish);
    443 	(void)signal(SIGTERM, finish);
    444 	if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
    445 	    0664)) >= 0) {
    446 		(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
    447 		ct = ctime(&shuttime);
    448 		(void)write(logfd, ct + 11, 5);
    449 		(void)write(logfd, "\n\n", 2);
    450 		(void)write(logfd, mbuf, strlen(mbuf));
    451 		(void)close(logfd);
    452 	}
    453 }
    454 
    455 void
    456 finish()
    457 {
    458 	if (!killflg)
    459 		(void)unlink(_PATH_NOLOGIN);
    460 	exit(0);
    461 }
    462 
    463 badtime()
    464 {
    465 	(void)fprintf(stderr, "shutdown: bad time format.\n");
    466 	exit(1);
    467 }
    468 
    469 usage()
    470 {
    471 	fprintf(stderr, "usage: shutdown [-fhknr] shutdowntime [ message ]\n");
    472 	exit(1);
    473 }
    474