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shutdown.c revision 1.9 
      1 /*	$NetBSD: shutdown.c,v 1.9 1995/03/18 15:01:09 cgd 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 1.9 1995/03/18 15:01:09 cgd 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;
     93 static char *nosync, *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 	nosync = NULL;
    123 	readstdin = 0;
    124 	while ((ch = getopt(argc, argv, "-fhknr")) != EOF)
    125 		switch (ch) {
    126 		case '-':
    127 			readstdin = 1;
    128 			break;
    129 		case 'f':
    130 			dofast = 1;
    131 			break;
    132 		case 'h':
    133 			dohalt = 1;
    134 			break;
    135 		case 'k':
    136 			killflg = 1;
    137 			break;
    138 		case 'n':
    139 			nosync = "-n";
    140 			break;
    141 		case 'r':
    142 			doreboot = 1;
    143 			break;
    144 		case '?':
    145 		default:
    146 			usage();
    147 		}
    148 	argc -= optind;
    149 	argv += optind;
    150 
    151 	if (argc < 1)
    152 		usage();
    153 
    154 	if (dofast && nosync) {
    155 		(void)fprintf(stderr,
    156 		    "shutdown: incompatible switches -f and -n.\n");
    157 		usage();
    158 	}
    159 	if (doreboot && dohalt) {
    160 		(void)fprintf(stderr,
    161 		    "shutdown: incompatible switches -h and -r.\n");
    162 		usage();
    163 	}
    164 	getoffset(*argv++);
    165 
    166 	if (*argv) {
    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 			memcpy(p, *argv, arglen);
    174 			p += arglen;
    175 		}
    176 		*p = '\n';
    177 		*++p = '\0';
    178 	}
    179 
    180 	if (readstdin) {
    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 }
    226 
    227 void
    228 loop()
    229 {
    230 	struct interval *tp;
    231 	u_int sltime;
    232 	int logged;
    233 
    234 	if (offset <= NOLOG_TIME) {
    235 		logged = 1;
    236 		nolog();
    237 	}
    238 	else
    239 		logged = 0;
    240 	tp = tlist;
    241 	if (tp->timeleft < offset)
    242 		(void)sleep((u_int)(offset - tp->timeleft));
    243 	else {
    244 		while (offset < tp->timeleft)
    245 			++tp;
    246 		/*
    247 		 * Warn now, if going to sleep more than a fifth of
    248 		 * the next wait time.
    249 		 */
    250 		if (sltime = offset - tp->timeleft) {
    251 			if (sltime > tp->timetowait / 5)
    252 				timewarn(offset);
    253 			(void)sleep(sltime);
    254 		}
    255 	}
    256 	for (;; ++tp) {
    257 		timewarn(tp->timeleft);
    258 		if (!logged && tp->timeleft <= NOLOG_TIME) {
    259 			logged = 1;
    260 			nolog();
    261 		}
    262 		(void)sleep((u_int)tp->timetowait);
    263 		if (!tp->timeleft)
    264 			break;
    265 	}
    266 	die_you_gravy_sucking_pig_dog();
    267 }
    268 
    269 static jmp_buf alarmbuf;
    270 
    271 void
    272 timewarn(timeleft)
    273 	int timeleft;
    274 {
    275 	static int first;
    276 	static char hostname[MAXHOSTNAMELEN + 1];
    277 	FILE *pf;
    278 	char wcmd[MAXPATHLEN + 4];
    279 
    280 	if (!first++)
    281 		(void)gethostname(hostname, sizeof(hostname));
    282 
    283 	/* undoc -n option to wall suppresses normal wall banner */
    284 	(void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL);
    285 	if (!(pf = popen(wcmd, "w"))) {
    286 		syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
    287 		return;
    288 	}
    289 
    290 	(void)fprintf(pf,
    291 	    "\007*** %sSystem shutdown message from %s@%s ***\007\n",
    292 	    timeleft ? "": "FINAL ", whom, hostname);
    293 
    294 	if (timeleft > 10*60)
    295 		(void)fprintf(pf, "System going down at %5.5s\n\n",
    296 		    ctime(&shuttime) + 11);
    297 	else if (timeleft > 59)
    298 		(void)fprintf(pf, "System going down in %d minute%s\n\n",
    299 		    timeleft / 60, (timeleft > 60) ? "s" : "");
    300 	else if (timeleft)
    301 		(void)fprintf(pf, "System going down in 30 seconds\n\n");
    302 	else
    303 		(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
    304 
    305 	if (mbuflen)
    306 		(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
    307 
    308 	/*
    309 	 * play some games, just in case wall doesn't come back
    310 	 * probably unecessary, given that wall is careful.
    311 	 */
    312 	if (!setjmp(alarmbuf)) {
    313 		(void)signal(SIGALRM, timeout);
    314 		(void)alarm((u_int)30);
    315 		(void)pclose(pf);
    316 		(void)alarm((u_int)0);
    317 		(void)signal(SIGALRM, SIG_DFL);
    318 	}
    319 }
    320 
    321 void
    322 timeout(signo)
    323 	int signo;
    324 {
    325 	longjmp(alarmbuf, 1);
    326 }
    327 
    328 void
    329 die_you_gravy_sucking_pig_dog()
    330 {
    331 
    332 	syslog(LOG_NOTICE, "%s by %s: %s",
    333 	    doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf);
    334 	(void)sleep(2);
    335 
    336 	(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
    337 	if (killflg) {
    338 		(void)printf("\rbut you'll have to do it yourself\r\n");
    339 		finish(0);
    340 	}
    341 	if (dofast)
    342 		doitfast();
    343 #ifdef DEBUG
    344 	if (doreboot)
    345 		(void)printf("reboot");
    346 	else if (dohalt)
    347 		(void)printf("halt");
    348 	if (nosync)
    349 		(void)printf(" no sync");
    350 	if (dofast)
    351 		(void)printf(" no fsck");
    352 	(void)printf("\nkill -HUP 1\n");
    353 #else
    354 	if (doreboot) {
    355 		execle(_PATH_REBOOT, "reboot", "-l", nosync, 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", "-l", nosync, 0);
    361 		syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_HALT);
    362 		perror("shutdown");
    363 	}
    364 	(void)kill(1, SIGTERM);		/* to single user */
    365 #endif
    366 	finish(0);
    367 }
    368 
    369 #define	ATOI2(p)	(p[0] - '0') * 10 + (p[1] - '0'); p += 2;
    370 
    371 void
    372 getoffset(timearg)
    373 	register char *timearg;
    374 {
    375 	register struct tm *lt;
    376 	register char *p;
    377 	time_t now;
    378 
    379 	if (!strcasecmp(timearg, "now")) {		/* now */
    380 		offset = 0;
    381 		return;
    382 	}
    383 
    384 	(void)time(&now);
    385 	if (*timearg == '+') {				/* +minutes */
    386 		if (!isdigit(*++timearg))
    387 			badtime();
    388 		offset = atoi(timearg) * 60;
    389 		shuttime = now + offset;
    390 		return;
    391 	}
    392 
    393 	/* handle hh:mm by getting rid of the colon */
    394 	for (p = timearg; *p; ++p)
    395 		if (!isascii(*p) || !isdigit(*p))
    396 			if (*p == ':' && strlen(p) == 3) {
    397 				p[0] = p[1];
    398 				p[1] = p[2];
    399 				p[2] = '\0';
    400 			}
    401 			else
    402 				badtime();
    403 
    404 	unsetenv("TZ");					/* OUR timezone */
    405 	lt = localtime(&now);				/* current time val */
    406 
    407 	switch(strlen(timearg)) {
    408 	case 10:
    409 		lt->tm_year = ATOI2(timearg);
    410 		/* FALLTHROUGH */
    411 	case 8:
    412 		lt->tm_mon = ATOI2(timearg);
    413 		if (--lt->tm_mon < 0 || lt->tm_mon > 11)
    414 			badtime();
    415 		/* FALLTHROUGH */
    416 	case 6:
    417 		lt->tm_mday = ATOI2(timearg);
    418 		if (lt->tm_mday < 1 || lt->tm_mday > 31)
    419 			badtime();
    420 		/* FALLTHROUGH */
    421 	case 4:
    422 		lt->tm_hour = ATOI2(timearg);
    423 		if (lt->tm_hour < 0 || lt->tm_hour > 23)
    424 			badtime();
    425 		lt->tm_min = ATOI2(timearg);
    426 		if (lt->tm_min < 0 || lt->tm_min > 59)
    427 			badtime();
    428 		lt->tm_sec = 0;
    429 		if ((shuttime = mktime(lt)) == -1)
    430 			badtime();
    431 		if ((offset = shuttime - now) < 0) {
    432 			(void)fprintf(stderr,
    433 			    "shutdown: that time is already past.\n");
    434 			exit(1);
    435 		}
    436 		break;
    437 	default:
    438 		badtime();
    439 	}
    440 }
    441 
    442 #define	FSMSG	"fastboot file for fsck\n"
    443 void
    444 doitfast()
    445 {
    446 	int fastfd;
    447 
    448 	if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC,
    449 	    0664)) >= 0) {
    450 		(void)write(fastfd, FSMSG, sizeof(FSMSG) - 1);
    451 		(void)close(fastfd);
    452 	}
    453 }
    454 
    455 #define	NOMSG	"\n\nNO LOGINS: System going down at "
    456 void
    457 nolog()
    458 {
    459 	int logfd;
    460 	char *ct;
    461 
    462 	(void)unlink(_PATH_NOLOGIN);	/* in case linked to another file */
    463 	(void)signal(SIGINT, finish);
    464 	(void)signal(SIGHUP, finish);
    465 	(void)signal(SIGQUIT, finish);
    466 	(void)signal(SIGTERM, finish);
    467 	if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
    468 	    0664)) >= 0) {
    469 		(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
    470 		ct = ctime(&shuttime);
    471 		(void)write(logfd, ct + 11, 5);
    472 		(void)write(logfd, "\n\n", 2);
    473 		(void)write(logfd, mbuf, strlen(mbuf));
    474 		(void)close(logfd);
    475 	}
    476 }
    477 
    478 void
    479 finish(signo)
    480 	int signo;
    481 {
    482 	if (!killflg)
    483 		(void)unlink(_PATH_NOLOGIN);
    484 	exit(0);
    485 }
    486 
    487 void
    488 badtime()
    489 {
    490 	(void)fprintf(stderr, "shutdown: bad time format.\n");
    491 	exit(1);
    492 }
    493 
    494 void
    495 usage()
    496 {
    497 	fprintf(stderr, "usage: shutdown [-fhknr] shutdowntime [ message ]\n");
    498 	exit(1);
    499 }
    500