shutdown.c revision 1.40 
1/*	$NetBSD: shutdown.c,v 1.40 2003/08/07 10:04:39 agc 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. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#ifndef lint
34__COPYRIGHT("@(#) Copyright (c) 1988, 1990, 1993\n\
35	The Regents of the University of California.  All rights reserved.\n");
36#endif /* not lint */
37
38#ifndef lint
39#if 0
40static char sccsid[] = "@(#)shutdown.c	8.4 (Berkeley) 4/28/95";
41#else
42__RCSID("$NetBSD: shutdown.c,v 1.40 2003/08/07 10:04:39 agc Exp $");
43#endif
44#endif /* not lint */
45
46#include <sys/param.h>
47#include <sys/time.h>
48#include <sys/resource.h>
49#include <sys/syslog.h>
50
51#include <ctype.h>
52#include <err.h>
53#include <fcntl.h>
54#include <pwd.h>
55#include <setjmp.h>
56#include <signal.h>
57#include <stdio.h>
58#include <stdlib.h>
59#include <string.h>
60#include <time.h>
61#include <tzfile.h>
62#include <unistd.h>
63
64#include "pathnames.h"
65
66#ifdef DEBUG
67#undef _PATH_NOLOGIN
68#define	_PATH_NOLOGIN	"./nologin"
69#undef _PATH_FASTBOOT
70#define	_PATH_FASTBOOT	"./fastboot"
71#endif
72
73#define	H		*60*60
74#define	M		*60
75#define	S		*1
76#define	NOLOG_TIME	5*60
77struct interval {
78	int timeleft, timetowait;
79} tlist[] = {
80	{ 10 H,  5 H },	{  5 H,  3 H },	{  2 H,  1 H },	{ 1 H, 30 M },
81	{ 30 M, 10 M },	{ 20 M, 10 M },	{ 10 M,  5 M },	{ 5 M,  3 M },
82	{  2 M,  1 M },	{  1 M, 30 S },	{ 30 S, 30 S },
83	{  0, 0 }
84};
85#undef H
86#undef M
87#undef S
88
89static time_t offset, shuttime;
90static int dofast, dohalt, doreboot, killflg, mbuflen, nofork, nosync, dodump;
91static int dopowerdown;
92static const char *whom;
93static char mbuf[BUFSIZ];
94char *bootstr;
95
96void badtime __P((void));
97void die_you_gravy_sucking_pig_dog __P((void));
98void doitfast __P((void));
99void dorcshutdown __P((void));
100void finish __P((int));
101void getoffset __P((char *));
102void loop __P((void));
103int main __P((int, char *[]));
104void nolog __P((void));
105void timeout __P((int));
106void timewarn __P((int));
107void usage __P((void));
108
109int
110main(argc, argv)
111	int argc;
112	char *argv[];
113{
114	char *p, *endp;
115	struct passwd *pw;
116	int arglen, ch, len;
117
118#ifndef DEBUG
119	if (geteuid())
120		errx(1, "NOT super-user");
121#endif
122	while ((ch = getopt(argc, argv, "b:Ddfhknpr")) != -1)
123		switch (ch) {
124		case 'b':
125			bootstr = optarg;
126			break;
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		if (bootstr)
379			*arg++ = bootstr;
380		*arg++ = 0;
381#ifndef DEBUG
382		execve(path, args, (char **)0);
383		syslog(LOG_ERR, "shutdown: can't exec %s: %m", path);
384		perror("shutdown");
385#else
386		printf("%s", path);
387		for (arg = &args[0]; *arg; arg++)
388			printf(" %s", *arg);
389		printf("\n");
390#endif
391	} else {
392#ifndef DEBUG
393		(void)kill(1, SIGTERM);		/* to single user */
394#else
395		printf("kill 1\n");
396#endif
397	}
398	finish(0);
399}
400
401#define	ATOI2(s)	((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
402
403void
404getoffset(timearg)
405	char *timearg;
406{
407	struct tm *lt;
408	char *p;
409	time_t now;
410	int yearset;
411
412	(void)time(&now);
413	if (!strcasecmp(timearg, "now")) {		/* now */
414		offset = 0;
415		shuttime = now;
416		return;
417	}
418
419	if (*timearg == '+') {				/* +minutes */
420		if (!isdigit(*++timearg))
421			badtime();
422		offset = atoi(timearg) * 60;
423		shuttime = now + offset;
424		return;
425	}
426
427	/* handle hh:mm by getting rid of the colon */
428	for (p = timearg; *p; ++p)
429		if (!isascii(*p) || !isdigit(*p)) {
430			if (*p == ':' && strlen(p) == 3) {
431				p[0] = p[1];
432				p[1] = p[2];
433				p[2] = '\0';
434			}
435			else
436				badtime();
437		}
438
439	unsetenv("TZ");					/* OUR timezone */
440	lt = localtime(&now);				/* current time val */
441
442	lt->tm_sec = 0;
443
444	yearset = 0;
445	switch (strlen(timearg)) {
446	case 12:
447		lt->tm_year = ATOI2(timearg) * 100 - TM_YEAR_BASE;
448		yearset = 1;
449		/* FALLTHROUGH */
450	case 10:
451		if (yearset) {
452			lt->tm_year += ATOI2(timearg);
453		} else {
454			yearset = ATOI2(timearg);
455			if (yearset < 69)
456				lt->tm_year = yearset + 2000 - TM_YEAR_BASE;
457			else
458				lt->tm_year = yearset + 1900 - TM_YEAR_BASE;
459		}
460		/* FALLTHROUGH */
461	case 8:
462		lt->tm_mon = ATOI2(timearg);
463		--lt->tm_mon;
464		/* FALLTHROUGH */
465	case 6:
466		lt->tm_mday = ATOI2(timearg);
467		/* FALLTHROUGH */
468	case 4:
469		lt->tm_hour = ATOI2(timearg);
470		/* FALLTHROUGH */
471	case 2:
472		lt->tm_min = ATOI2(timearg);
473		break;
474	default:
475		badtime();
476	}
477
478	if ((shuttime = mktime(lt)) == -1)
479		badtime();
480	if ((offset = shuttime - now) < 0)
481		errx(1, "time is already past");
482}
483
484void
485dorcshutdown()
486{
487	(void)printf("\r\nAbout to run shutdown hooks...\r\n");
488	(void)system(". " _PATH_RCSHUTDOWN);
489	(void)sleep(5);		/* Give operator a chance to abort this. */
490	(void)printf("\r\nDone running shutdown hooks.\r\n");
491}
492
493#define	FSMSG	"fastboot file for fsck\n"
494void
495doitfast()
496{
497	int fastfd;
498
499	if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC,
500	    0664)) >= 0) {
501		(void)write(fastfd, FSMSG, sizeof(FSMSG) - 1);
502		(void)close(fastfd);
503	}
504}
505
506#define	NOMSG	"\n\nNO LOGINS: System going down at "
507void
508nolog()
509{
510	int logfd;
511	char *ct;
512
513	(void)unlink(_PATH_NOLOGIN);	/* in case linked to another file */
514	(void)signal(SIGINT, finish);
515	(void)signal(SIGHUP, finish);
516	(void)signal(SIGQUIT, finish);
517	(void)signal(SIGTERM, finish);
518	if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
519	    0664)) >= 0) {
520		(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
521		ct = ctime(&shuttime);
522		(void)write(logfd, ct + 11, 5);
523		(void)write(logfd, "\n\n", 2);
524		(void)write(logfd, mbuf, strlen(mbuf));
525		(void)close(logfd);
526	}
527}
528
529void
530finish(signo)
531	int signo;
532{
533
534	if (!killflg)
535		(void)unlink(_PATH_NOLOGIN);
536	exit(0);
537}
538
539void
540badtime()
541{
542
543	warnx("illegal time format");
544	usage();
545}
546
547void
548usage()
549{
550
551	(void)fprintf(stderr,
552	    "usage: shutdown [-Ddfhknpr] time [message ... | -]\n");
553	exit(1);
554}
555