shutdown.c revision 1.34 
1/*	$NetBSD: shutdown.c,v 1.34 1998/11/22 19:13:45 bad 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
44static char sccsid[] = "@(#)shutdown.c	8.4 (Berkeley) 4/28/95";
45#else
46__RCSID("$NetBSD: shutdown.c,v 1.34 1998/11/22 19:13:45 bad 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
81struct 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
93static time_t offset, shuttime;
94static int dofast, dohalt, doreboot, killflg, mbuflen, nofork, nosync, dodump;
95static int dopowerdown;
96static const char *whom;
97static char mbuf[BUFSIZ];
98
99void badtime __P((void));
100void die_you_gravy_sucking_pig_dog __P((void));
101void doitfast __P((void));
102void dorcshutdown __P((void));
103void finish __P((int));
104void getoffset __P((char *));
105void loop __P((void));
106int main __P((int, char *[]));
107void nolog __P((void));
108void timeout __P((int));
109void timewarn __P((int));
110void usage __P((void));
111
112int
113main(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
241void
242loop()
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
283static jmp_buf alarmbuf;
284
285void
286timewarn(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
337void
338timeout(signo)
339	int signo;
340{
341	longjmp(alarmbuf, 1);
342}
343
344void
345die_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		exect(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
401void
402getoffset(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
482void
483dorcshutdown()
484{
485	(void)printf("\r\nAbout to run shutdown hooks...\r\n");
486	(void)system(__CONCAT(". ", _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"
492void
493doitfast()
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 "
505void
506nolog()
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
527void
528finish(signo)
529	int signo;
530{
531
532	if (!killflg)
533		(void)unlink(_PATH_NOLOGIN);
534	exit(0);
535}
536
537void
538badtime()
539{
540
541	warnx("illegal time format");
542	usage();
543}
544
545void
546usage()
547{
548
549	(void)fprintf(stderr,
550	    "usage: shutdown [-Ddfhknpr] time [message ... | -]\n");
551	exit(1);
552}
553