xref: /netbsd/sbin/shutdown/shutdown.c (revision bf9ec67e) 
1 /*	$NetBSD: shutdown.c,v 1.38 2000/12/20 00:31:41 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 #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 1.38 2000/12/20 00:31:41 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 <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 <time.h>
65 #include <tzfile.h>
66 #include <unistd.h>
67 
68 #include "pathnames.h"
69 
70 #ifdef DEBUG
71 #undef _PATH_NOLOGIN
72 #define	_PATH_NOLOGIN	"./nologin"
73 #undef _PATH_FASTBOOT
74 #define	_PATH_FASTBOOT	"./fastboot"
75 #endif
76 
77 #define	H		*60*60
78 #define	M		*60
79 #define	S		*1
80 #define	NOLOG_TIME	5*60
81 struct interval {
82 	int timeleft, timetowait;
83 } tlist[] = {
84 	{ 10 H,  5 H },	{  5 H,  3 H },	{  2 H,  1 H },	{ 1 H, 30 M },
85 	{ 30 M, 10 M },	{ 20 M, 10 M },	{ 10 M,  5 M },	{ 5 M,  3 M },
86 	{  2 M,  1 M },	{  1 M, 30 S },	{ 30 S, 30 S },
87 	{  0, 0 }
88 };
89 #undef H
90 #undef M
91 #undef S
92 
93 static time_t offset, shuttime;
94 static int dofast, dohalt, doreboot, killflg, mbuflen, nofork, nosync, dodump;
95 static int dopowerdown;
96 static const char *whom;
97 static char mbuf[BUFSIZ];
98 
99 void badtime __P((void));
100 void die_you_gravy_sucking_pig_dog __P((void));
101 void doitfast __P((void));
102 void dorcshutdown __P((void));
103 void finish __P((int));
104 void getoffset __P((char *));
105 void loop __P((void));
106 int main __P((int, char *[]));
107 void nolog __P((void));
108 void timeout __P((int));
109 void timewarn __P((int));
110 void usage __P((void));
111 
112 int
113 main(argc, argv)
114 	int argc;
115 	char *argv[];
116 {
117 	char *p, *endp;
118 	struct passwd *pw;
119 	int arglen, ch, len;
120 
121 #ifndef DEBUG
122 	if (geteuid())
123 		errx(1, "NOT super-user");
124 #endif
125 	while ((ch = getopt(argc, argv, "Ddfhknpr")) != -1)
126 		switch (ch) {
127 		case 'd':
128 			dodump = 1;
129 			break;
130 		case 'D':
131 			nofork = 1;
132 			break;
133 		case 'f':
134 			dofast = 1;
135 			break;
136 		case 'p':
137 			dopowerdown = 1;
138 			/* FALLTHROUGH */
139 		case 'h':
140 			dohalt = 1;
141 			break;
142 		case 'k':
143 			killflg = 1;
144 			break;
145 		case 'n':
146 			nosync = 1;
147 			break;
148 		case 'r':
149 			doreboot = 1;
150 			break;
151 		case '?':
152 		default:
153 			usage();
154 		}
155 	argc -= optind;
156 	argv += optind;
157 
158 	if (argc < 1)
159 		usage();
160 
161 	if (dodump && !dohalt && !doreboot)
162 		doreboot = 1;
163 
164 	if (dofast && nosync) {
165 		warnx("incompatible switches -f and -n");
166 		usage();
167 	}
168 	if (dohalt && doreboot) {
169 		const char *which_flag = dopowerdown ? "p" : "h";
170 
171 		warnx("incompatible switches -%s and -r", which_flag);
172 		usage();
173 	}
174 
175 	getoffset(*argv++);
176 
177 	if (argv[0]) {
178 		if (strcmp(argv[0], "-") || argv[1]) {
179 			for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
180 				arglen = strlen(*argv);
181 				if ((len -= arglen) <= 2)
182 					break;
183 				if (p != mbuf)
184 					*p++ = ' ';
185 				memmove(p, *argv, arglen);
186 				p += arglen;
187 			}
188 			*p = '\n';
189 			*++p = '\0';
190 		} else {
191 			p = mbuf;
192 			endp = mbuf + sizeof(mbuf) - 2;
193 			for (;;) {
194 				if (!fgets(p, endp - p + 1, stdin))
195 					break;
196 				for (; *p &&  p < endp; ++p);
197 				if (p == endp) {
198 					*p = '\n';
199 					*++p = '\0';
200 					break;
201 				}
202 			}
203 		}
204 	}
205 	mbuflen = strlen(mbuf);
206 
207 	if (offset)
208 		(void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
209 	else
210 		(void)printf("Shutdown NOW!\n");
211 
212 	if (!(whom = getlogin()))
213 		whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
214 
215 #ifdef DEBUG
216 	(void)putc('\n', stdout);
217 #else
218 	(void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
219 	if (nofork == 0) {
220 		int forkpid;
221 
222 		forkpid = fork();
223 		if (forkpid == -1) {
224 			perror("shutdown: fork");
225 			exit(1);
226 		}
227 		if (forkpid) {
228 			(void)printf("shutdown: [pid %d]\n", forkpid);
229 			exit(0);
230 		}
231 	}
232 #endif
233 	openlog("shutdown", LOG_CONS, LOG_AUTH);
234 	loop();
235 	/* NOTREACHED */
236 #ifdef __GNUC__
237 	return 1;
238 #endif
239 }
240 
241 void
242 loop()
243 {
244 	struct interval *tp;
245 	u_int sltime;
246 	int logged;
247 
248 	if (offset <= NOLOG_TIME) {
249 		logged = 1;
250 		nolog();
251 	}
252 	else
253 		logged = 0;
254 	tp = tlist;
255 	if (tp->timeleft < offset)
256 		(void)sleep((u_int)(offset - tp->timeleft));
257 	else {
258 		while (offset < tp->timeleft)
259 			++tp;
260 		/*
261 		 * Warn now, if going to sleep more than a fifth of
262 		 * the next wait time.
263 		 */
264 		if ((sltime = offset - tp->timeleft) != 0) {
265 			if (sltime > tp->timetowait / 5)
266 				timewarn(offset);
267 			(void)sleep(sltime);
268 		}
269 	}
270 	for (;; ++tp) {
271 		timewarn(tp->timeleft);
272 		if (!logged && tp->timeleft <= NOLOG_TIME) {
273 			logged = 1;
274 			nolog();
275 		}
276 		(void)sleep((u_int)tp->timetowait);
277 		if (!tp->timeleft)
278 			break;
279 	}
280 	die_you_gravy_sucking_pig_dog();
281 }
282 
283 static jmp_buf alarmbuf;
284 
285 void
286 timewarn(timeleft)
287 	int timeleft;
288 {
289 	static int first;
290 	static char hostname[MAXHOSTNAMELEN + 1];
291 	FILE *pf;
292 	char wcmd[MAXPATHLEN + 4];
293 
294 	if (!first++) {
295 		(void)gethostname(hostname, sizeof(hostname));
296 		hostname[sizeof(hostname) - 1] = '\0';
297 	}
298 
299 	/* undoc -n option to wall suppresses normal wall banner */
300 	(void)snprintf(wcmd, sizeof wcmd, "%s -n", _PATH_WALL);
301 	if (!(pf = popen(wcmd, "w"))) {
302 		syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
303 		return;
304 	}
305 
306 	(void)fprintf(pf,
307 	    "\007*** %sSystem shutdown message from %s@%s ***\007\n",
308 	    timeleft ? "": "FINAL ", whom, hostname);
309 
310 	if (timeleft > 10*60)
311 		(void)fprintf(pf, "System going down at %5.5s\n\n",
312 		    ctime(&shuttime) + 11);
313 	else if (timeleft > 59)
314 		(void)fprintf(pf, "System going down in %d minute%s\n\n",
315 		    timeleft / 60, (timeleft > 60) ? "s" : "");
316 	else if (timeleft)
317 		(void)fprintf(pf, "System going down in 30 seconds\n\n");
318 	else
319 		(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
320 
321 	if (mbuflen)
322 		(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
323 
324 	/*
325 	 * play some games, just in case wall doesn't come back
326 	 * probably unecessary, given that wall is careful.
327 	 */
328 	if (!setjmp(alarmbuf)) {
329 		(void)signal(SIGALRM, timeout);
330 		(void)alarm((u_int)30);
331 		(void)pclose(pf);
332 		(void)alarm((u_int)0);
333 		(void)signal(SIGALRM, SIG_DFL);
334 	}
335 }
336 
337 void
338 timeout(signo)
339 	int signo;
340 {
341 	longjmp(alarmbuf, 1);
342 }
343 
344 void
345 die_you_gravy_sucking_pig_dog()
346 {
347 
348 	syslog(LOG_NOTICE, "%s by %s: %s",
349 	    doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf);
350 	(void)sleep(2);
351 
352 	(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
353 	if (killflg) {
354 		(void)printf("\rbut you'll have to do it yourself\r\n");
355 		finish(0);
356 	}
357 	if (dofast)
358 		doitfast();
359 	dorcshutdown();
360 	if (doreboot || dohalt) {
361 		char *args[16], **arg, *path;
362 
363 		arg = &args[0];
364 		if (doreboot) {
365 			path = _PATH_REBOOT;
366 			*arg++ = "reboot";
367 		} else {
368 			path = _PATH_HALT;
369 			*arg++ = "halt";
370 		}
371 		if (dodump)
372 			*arg++ = "-d";
373 		if (nosync)
374 			*arg++ = "-n";
375 		if (dopowerdown)
376 			*arg++ = "-p";
377 		*arg++ = "-l";
378 		*arg++ = 0;
379 #ifndef DEBUG
380 		execve(path, args, (char **)0);
381 		syslog(LOG_ERR, "shutdown: can't exec %s: %m", path);
382 		perror("shutdown");
383 #else
384 		printf("%s", path);
385 		for (arg = &args[0]; *arg; arg++)
386 			printf(" %s", *arg);
387 		printf("\n");
388 #endif
389 	} else {
390 #ifndef DEBUG
391 		(void)kill(1, SIGTERM);		/* to single user */
392 #else
393 		printf("kill 1\n");
394 #endif
395 	}
396 	finish(0);
397 }
398 
399 #define	ATOI2(s)	((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
400 
401 void
402 getoffset(timearg)
403 	char *timearg;
404 {
405 	struct tm *lt;
406 	char *p;
407 	time_t now;
408 	int yearset;
409 
410 	(void)time(&now);
411 	if (!strcasecmp(timearg, "now")) {		/* now */
412 		offset = 0;
413 		shuttime = now;
414 		return;
415 	}
416 
417 	if (*timearg == '+') {				/* +minutes */
418 		if (!isdigit(*++timearg))
419 			badtime();
420 		offset = atoi(timearg) * 60;
421 		shuttime = now + offset;
422 		return;
423 	}
424 
425 	/* handle hh:mm by getting rid of the colon */
426 	for (p = timearg; *p; ++p)
427 		if (!isascii(*p) || !isdigit(*p)) {
428 			if (*p == ':' && strlen(p) == 3) {
429 				p[0] = p[1];
430 				p[1] = p[2];
431 				p[2] = '\0';
432 			}
433 			else
434 				badtime();
435 		}
436 
437 	unsetenv("TZ");					/* OUR timezone */
438 	lt = localtime(&now);				/* current time val */
439 
440 	lt->tm_sec = 0;
441 
442 	yearset = 0;
443 	switch (strlen(timearg)) {
444 	case 12:
445 		lt->tm_year = ATOI2(timearg) * 100 - TM_YEAR_BASE;
446 		yearset = 1;
447 		/* FALLTHROUGH */
448 	case 10:
449 		if (yearset) {
450 			lt->tm_year += ATOI2(timearg);
451 		} else {
452 			yearset = ATOI2(timearg);
453 			if (yearset < 69)
454 				lt->tm_year = yearset + 2000 - TM_YEAR_BASE;
455 			else
456 				lt->tm_year = yearset + 1900 - TM_YEAR_BASE;
457 		}
458 		/* FALLTHROUGH */
459 	case 8:
460 		lt->tm_mon = ATOI2(timearg);
461 		--lt->tm_mon;
462 		/* FALLTHROUGH */
463 	case 6:
464 		lt->tm_mday = ATOI2(timearg);
465 		/* FALLTHROUGH */
466 	case 4:
467 		lt->tm_hour = ATOI2(timearg);
468 		/* FALLTHROUGH */
469 	case 2:
470 		lt->tm_min = ATOI2(timearg);
471 		break;
472 	default:
473 		badtime();
474 	}
475 
476 	if ((shuttime = mktime(lt)) == -1)
477 		badtime();
478 	if ((offset = shuttime - now) < 0)
479 		errx(1, "time is already past");
480 }
481 
482 void
483 dorcshutdown()
484 {
485 	(void)printf("\r\nAbout to run shutdown hooks...\r\n");
486 	(void)system(". " _PATH_RCSHUTDOWN);
487 	(void)sleep(5);		/* Give operator a chance to abort this. */
488 	(void)printf("\r\nDone running shutdown hooks.\r\n");
489 }
490 
491 #define	FSMSG	"fastboot file for fsck\n"
492 void
493 doitfast()
494 {
495 	int fastfd;
496 
497 	if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC,
498 	    0664)) >= 0) {
499 		(void)write(fastfd, FSMSG, sizeof(FSMSG) - 1);
500 		(void)close(fastfd);
501 	}
502 }
503 
504 #define	NOMSG	"\n\nNO LOGINS: System going down at "
505 void
506 nolog()
507 {
508 	int logfd;
509 	char *ct;
510 
511 	(void)unlink(_PATH_NOLOGIN);	/* in case linked to another file */
512 	(void)signal(SIGINT, finish);
513 	(void)signal(SIGHUP, finish);
514 	(void)signal(SIGQUIT, finish);
515 	(void)signal(SIGTERM, finish);
516 	if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
517 	    0664)) >= 0) {
518 		(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
519 		ct = ctime(&shuttime);
520 		(void)write(logfd, ct + 11, 5);
521 		(void)write(logfd, "\n\n", 2);
522 		(void)write(logfd, mbuf, strlen(mbuf));
523 		(void)close(logfd);
524 	}
525 }
526 
527 void
528 finish(signo)
529 	int signo;
530 {
531 
532 	if (!killflg)
533 		(void)unlink(_PATH_NOLOGIN);
534 	exit(0);
535 }
536 
537 void
538 badtime()
539 {
540 
541 	warnx("illegal time format");
542 	usage();
543 }
544 
545 void
546 usage()
547 {
548 
549 	(void)fprintf(stderr,
550 	    "usage: shutdown [-Ddfhknpr] time [message ... | -]\n");
551 	exit(1);
552 }
553