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shutdown.c revision 1.4 
      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 1.4 1993/08/01 18:24:03 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 main(argc, argv)
     86 	int argc;
     87 	char **argv;
     88 {
     89 	extern int optind;
     90 	register char *p, *endp;
     91 	int arglen, ch, len, readstdin;
     92 	struct passwd *pw;
     93 	char *strcat(), *getlogin();
     94 	uid_t geteuid();
     95 
     96 #ifndef DEBUG
     97 	if (geteuid()) {
     98 		(void)fprintf(stderr, "shutdown: NOT super-user\n");
     99 		exit(1);
    100 	}
    101 #endif
    102 	nosync = NULL;
    103 	readstdin = 0;
    104 	while ((ch = getopt(argc, argv, "-fhknr")) != EOF)
    105 		switch (ch) {
    106 		case '-':
    107 			readstdin = 1;
    108 			break;
    109 		case 'f':
    110 			dofast = 1;
    111 			break;
    112 		case 'h':
    113 			dohalt = 1;
    114 			break;
    115 		case 'k':
    116 			killflg = 1;
    117 			break;
    118 		case 'n':
    119 			nosync = "-n";
    120 			break;
    121 		case 'r':
    122 			doreboot = 1;
    123 			break;
    124 		case '?':
    125 		default:
    126 			usage();
    127 		}
    128 	argc -= optind;
    129 	argv += optind;
    130 
    131 	if (argc < 1)
    132 		usage();
    133 
    134 	if (dofast && nosync) {
    135 		(void)fprintf(stderr,
    136 		    "shutdown: incompatible switches -f and -n.\n");
    137 		usage();
    138 	}
    139 	if (doreboot && dohalt) {
    140 		(void)fprintf(stderr,
    141 		    "shutdown: incompatible switches -h and -r.\n");
    142 		usage();
    143 	}
    144 	getoffset(*argv++);
    145 
    146 	if (*argv) {
    147 		for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
    148 			arglen = strlen(*argv);
    149 			if ((len -= arglen) <= 2)
    150 				break;
    151 			if (p != mbuf)
    152 				*p++ = ' ';
    153 			bcopy(*argv, p, arglen);
    154 			p += arglen;
    155 		}
    156 		*p = '\n';
    157 		*++p = '\0';
    158 	}
    159 
    160 	if (readstdin) {
    161 		p = mbuf;
    162 		endp = mbuf + sizeof(mbuf) - 2;
    163 		for (;;) {
    164 			if (!fgets(p, endp - p + 1, stdin))
    165 				break;
    166 			for (; *p &&  p < endp; ++p);
    167 			if (p == endp) {
    168 				*p = '\n';
    169 				*++p = '\0';
    170 				break;
    171 			}
    172 		}
    173 	}
    174 	mbuflen = strlen(mbuf);
    175 
    176 	if (offset)
    177 		(void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
    178 	else
    179 		(void)printf("Shutdown NOW!\n");
    180 
    181 	if (!(whom = getlogin()))
    182 		whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
    183 
    184 #ifdef DEBUG
    185 	(void)putc('\n', stdout);
    186 #else
    187 	(void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
    188 	{
    189 		int forkpid;
    190 
    191 		forkpid = fork();
    192 		if (forkpid == -1) {
    193 			perror("shutdown: fork");
    194 			exit(1);
    195 		}
    196 		if (forkpid) {
    197 			(void)printf("shutdown: [pid %d]\n", forkpid);
    198 			exit(0);
    199 		}
    200 	}
    201 #endif
    202 	openlog("shutdown", LOG_CONS, LOG_AUTH);
    203 	loop();
    204 	/*NOTREACHED*/
    205 }
    206 
    207 loop()
    208 {
    209 	u_int sltime;
    210 	int logged;
    211 
    212 	if (offset <= NOLOG_TIME) {
    213 		logged = 1;
    214 		nolog();
    215 	}
    216 	else
    217 		logged = 0;
    218 	tp = tlist;
    219 	if (tp->timeleft < offset)
    220 		(void)sleep((u_int)(offset - tp->timeleft));
    221 	else {
    222 		while (offset < tp->timeleft)
    223 			++tp;
    224 		/*
    225 		 * warn now, if going to sleep more than a fifth of
    226 		 * the next wait time.
    227 		 */
    228 		if (sltime = offset - tp->timeleft) {
    229 			if (sltime > tp->timetowait / 5)
    230 				warn();
    231 			(void)sleep(sltime);
    232 		}
    233 	}
    234 	for (;; ++tp) {
    235 		warn();
    236 		if (!logged && tp->timeleft <= NOLOG_TIME) {
    237 			logged = 1;
    238 			nolog();
    239 		}
    240 		(void)sleep((u_int)tp->timetowait);
    241 		if (!tp->timeleft)
    242 			break;
    243 	}
    244 	die_you_gravy_sucking_pig_dog();
    245 }
    246 
    247 static jmp_buf alarmbuf;
    248 
    249 warn()
    250 {
    251 	static int first;
    252 	static char hostname[MAXHOSTNAMELEN + 1];
    253 	char wcmd[MAXPATHLEN + 4];
    254 	FILE *pf;
    255 	char *ctime();
    256 	void timeout();
    257 
    258 	if (!first++)
    259 		(void)gethostname(hostname, sizeof(hostname));
    260 
    261 	/* undoc -n option to wall suppresses normal wall banner */
    262 	(void)sprintf(wcmd, "%s -n", _PATH_WALL);
    263 	if (!(pf = popen(wcmd, "w"))) {
    264 		syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
    265 		return;
    266 	}
    267 
    268 	(void)fprintf(pf,
    269 	    "\007*** %sSystem shutdown message from %s@%s ***\007\n",
    270 	    tp->timeleft ? "": "FINAL ", whom, hostname);
    271 
    272 	if (tp->timeleft > 10*60)
    273 		(void)fprintf(pf, "System going down at %5.5s\n\n",
    274 		    ctime(&shuttime) + 11);
    275 	else if (tp->timeleft > 59)
    276 		(void)fprintf(pf, "System going down in %d minute%s\n\n",
    277 		    tp->timeleft / 60, (tp->timeleft > 60) ? "s" : "");
    278 	else if (tp->timeleft)
    279 		(void)fprintf(pf, "System going down in 30 seconds\n\n");
    280 	else
    281 		(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
    282 
    283 	if (mbuflen)
    284 		(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
    285 
    286 	/*
    287 	 * play some games, just in case wall doesn't come back
    288 	 * probably unecessary, given that wall is careful.
    289 	 */
    290 	if (!setjmp(alarmbuf)) {
    291 		(void)signal(SIGALRM, timeout);
    292 		(void)alarm((u_int)30);
    293 		(void)pclose(pf);
    294 		(void)alarm((u_int)0);
    295 		(void)signal(SIGALRM, SIG_DFL);
    296 	}
    297 }
    298 
    299 void
    300 timeout()
    301 {
    302 	longjmp(alarmbuf, 1);
    303 }
    304 
    305 die_you_gravy_sucking_pig_dog()
    306 {
    307 	void finish();
    308 
    309 	syslog(LOG_NOTICE, "%s by %s: %s",
    310 	    doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf);
    311 	(void)sleep(2);
    312 
    313 	(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
    314 	if (killflg) {
    315 		(void)printf("\rbut you'll have to do it yourself\r\n");
    316 		finish();
    317 	}
    318 	if (dofast)
    319 		doitfast();
    320 #ifdef DEBUG
    321 	if (doreboot)
    322 		(void)printf("reboot");
    323 	else if (dohalt)
    324 		(void)printf("halt");
    325 	if (nosync)
    326 		(void)printf(" no sync");
    327 	if (dofast)
    328 		(void)printf(" no fsck");
    329 	(void)printf("\nkill -HUP 1\n");
    330 #else
    331 	if (doreboot) {
    332 		execle(_PATH_REBOOT, "reboot", "-l", nosync, 0);
    333 		syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_REBOOT);
    334 		perror("shutdown");
    335 	}
    336 	else if (dohalt) {
    337 		execle(_PATH_HALT, "halt", "-l", nosync, 0);
    338 		syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_HALT);
    339 		perror("shutdown");
    340 	}
    341 	(void)kill(1, SIGTERM);		/* to single user */
    342 #endif
    343 	finish();
    344 }
    345 
    346 #define	ATOI2(p)	(p[0] - '0') * 10 + (p[1] - '0'); p += 2;
    347 
    348 getoffset(timearg)
    349 	register char *timearg;
    350 {
    351 	register struct tm *lt;
    352 	register char *p;
    353 	time_t now, time();
    354 
    355 	if (!strcasecmp(timearg, "now")) {		/* now */
    356 		offset = 0;
    357 		return;
    358 	}
    359 
    360 	(void)time(&now);
    361 	if (*timearg == '+') {				/* +minutes */
    362 		if (!isdigit(*++timearg))
    363 			badtime();
    364 		offset = atoi(timearg) * 60;
    365 		shuttime = now + offset;
    366 		return;
    367 	}
    368 
    369 	/* handle hh:mm by getting rid of the colon */
    370 	for (p = timearg; *p; ++p)
    371 		if (!isascii(*p) || !isdigit(*p))
    372 			if (*p == ':' && strlen(p) == 3) {
    373 				p[0] = p[1];
    374 				p[1] = p[2];
    375 				p[2] = '\0';
    376 			}
    377 			else
    378 				badtime();
    379 
    380 	unsetenv("TZ");					/* OUR timezone */
    381 	lt = localtime(&now);				/* current time val */
    382 
    383 	switch(strlen(timearg)) {
    384 	case 10:
    385 		lt->tm_year = ATOI2(timearg);
    386 		/* FALLTHROUGH */
    387 	case 8:
    388 		lt->tm_mon = ATOI2(timearg);
    389 		if (--lt->tm_mon < 0 || lt->tm_mon > 11)
    390 			badtime();
    391 		/* FALLTHROUGH */
    392 	case 6:
    393 		lt->tm_mday = ATOI2(timearg);
    394 		if (lt->tm_mday < 1 || lt->tm_mday > 31)
    395 			badtime();
    396 		/* FALLTHROUGH */
    397 	case 4:
    398 		lt->tm_hour = ATOI2(timearg);
    399 		if (lt->tm_hour < 0 || lt->tm_hour > 23)
    400 			badtime();
    401 		lt->tm_min = ATOI2(timearg);
    402 		if (lt->tm_min < 0 || lt->tm_min > 59)
    403 			badtime();
    404 		lt->tm_sec = 0;
    405 		if ((shuttime = mktime(lt)) == -1)
    406 			badtime();
    407 		if ((offset = shuttime - now) < 0) {
    408 			(void)fprintf(stderr,
    409 			    "shutdown: that time is already past.\n");
    410 			exit(1);
    411 		}
    412 		break;
    413 	default:
    414 		badtime();
    415 	}
    416 }
    417 
    418 #define	FSMSG	"fastboot file for fsck\n"
    419 doitfast()
    420 {
    421 	int fastfd;
    422 
    423 	if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC,
    424 	    0664)) >= 0) {
    425 		(void)write(fastfd, FSMSG, sizeof(FSMSG) - 1);
    426 		(void)close(fastfd);
    427 	}
    428 }
    429 
    430 #define	NOMSG	"\n\nNO LOGINS: System going down at "
    431 nolog()
    432 {
    433 	int logfd;
    434 	char *ct, *ctime();
    435 	void finish();
    436 
    437 	(void)unlink(_PATH_NOLOGIN);	/* in case linked to another file */
    438 	(void)signal(SIGINT, finish);
    439 	(void)signal(SIGHUP, finish);
    440 	(void)signal(SIGQUIT, finish);
    441 	(void)signal(SIGTERM, finish);
    442 	if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
    443 	    0664)) >= 0) {
    444 		(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
    445 		ct = ctime(&shuttime);
    446 		(void)write(logfd, ct + 11, 5);
    447 		(void)write(logfd, "\n\n", 2);
    448 		(void)write(logfd, mbuf, strlen(mbuf));
    449 		(void)close(logfd);
    450 	}
    451 }
    452 
    453 void
    454 finish()
    455 {
    456 	(void)unlink(_PATH_NOLOGIN);
    457 	exit(0);
    458 }
    459 
    460 badtime()
    461 {
    462 	(void)fprintf(stderr, "shutdown: bad time format.\n");
    463 	exit(1);
    464 }
    465 
    466 usage()
    467 {
    468 	fprintf(stderr, "usage: shutdown [-fhknr] shutdowntime [ message ]\n");
    469 	exit(1);
    470 }
    471