shutdown.c revision 1.43 
1/*	$NetBSD: shutdown.c,v 1.43 2005/02/05 13:15:12 xtraeme 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 1.43 2005/02/05 13:15:12 xtraeme 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(void);
97void die_you_gravy_sucking_pig_dog(void);
98void doitfast(void);
99void dorcshutdown(void);
100void finish(int);
101void getoffset(char *);
102void loop(void);
103void nolog(void);
104void timeout(int);
105void timewarn(int);
106void usage(void);
107
108int
109main(int argc, char *argv[])
110{
111	char *p, *endp;
112	struct passwd *pw;
113	int arglen, ch, len;
114
115#ifndef DEBUG
116	if (geteuid())
117		errx(1, "NOT super-user");
118#endif
119	while ((ch = getopt(argc, argv, "b:Ddfhknpr")) != -1)
120		switch (ch) {
121		case 'b':
122			bootstr = optarg;
123			break;
124		case 'd':
125			dodump = 1;
126			break;
127		case 'D':
128			nofork = 1;
129			break;
130		case 'f':
131			dofast = 1;
132			break;
133		case 'p':
134			dopowerdown = 1;
135			/* FALLTHROUGH */
136		case 'h':
137			dohalt = 1;
138			break;
139		case 'k':
140			killflg = 1;
141			break;
142		case 'n':
143			nosync = 1;
144			break;
145		case 'r':
146			doreboot = 1;
147			break;
148		case '?':
149		default:
150			usage();
151		}
152	argc -= optind;
153	argv += optind;
154
155	if (argc < 1)
156		usage();
157
158	if (dodump && !dohalt && !doreboot)
159		doreboot = 1;
160
161	if (dofast && nosync) {
162		warnx("incompatible switches -f and -n");
163		usage();
164	}
165	if (dohalt && doreboot) {
166		const char *which_flag = dopowerdown ? "p" : "h";
167
168		warnx("incompatible switches -%s and -r", which_flag);
169		usage();
170	}
171
172	getoffset(*argv++);
173
174	if (argv[0]) {
175		if (strcmp(argv[0], "-") || argv[1]) {
176			for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
177				arglen = strlen(*argv);
178				if ((len -= arglen) <= 2)
179					break;
180				if (p != mbuf)
181					*p++ = ' ';
182				memmove(p, *argv, arglen);
183				p += arglen;
184			}
185			*p = '\n';
186			*++p = '\0';
187		} else {
188			p = mbuf;
189			endp = mbuf + sizeof(mbuf) - 2;
190			for (;;) {
191				if (!fgets(p, endp - p + 1, stdin))
192					break;
193				for (; *p &&  p < endp; ++p);
194				if (p == endp) {
195					*p = '\n';
196					*++p = '\0';
197					break;
198				}
199			}
200		}
201	}
202	mbuflen = strlen(mbuf);
203
204	if (offset)
205		(void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
206	else
207		(void)printf("Shutdown NOW!\n");
208
209	if (!(whom = getlogin()))
210		whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
211
212#ifdef DEBUG
213	(void)putc('\n', stdout);
214#else
215	(void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
216	if (nofork == 0) {
217		int forkpid;
218
219		forkpid = fork();
220		if (forkpid == -1) {
221			perror("shutdown: fork");
222			exit(1);
223		}
224		if (forkpid) {
225			(void)printf("shutdown: [pid %d]\n", forkpid);
226			exit(0);
227		}
228	}
229#endif
230	openlog("shutdown", LOG_CONS, LOG_AUTH);
231	loop();
232	/* NOTREACHED */
233#ifdef __GNUC__
234	return 1;
235#endif
236}
237
238void
239loop(void)
240{
241	struct interval *tp;
242	u_int sltime;
243	int logged;
244
245	if (offset <= NOLOG_TIME) {
246		logged = 1;
247		nolog();
248	}
249	else
250		logged = 0;
251	tp = tlist;
252	if (tp->timeleft < offset)
253		(void)sleep((u_int)(offset - tp->timeleft));
254	else {
255		while (offset < tp->timeleft)
256			++tp;
257		/*
258		 * Warn now, if going to sleep more than a fifth of
259		 * the next wait time.
260		 */
261		if ((sltime = offset - tp->timeleft) != 0) {
262			if (sltime > tp->timetowait / 5)
263				timewarn(offset);
264			(void)sleep(sltime);
265		}
266	}
267	for (;; ++tp) {
268		timewarn(tp->timeleft);
269		if (!logged && tp->timeleft <= NOLOG_TIME) {
270			logged = 1;
271			nolog();
272		}
273		(void)sleep((u_int)tp->timetowait);
274		if (!tp->timeleft)
275			break;
276	}
277	die_you_gravy_sucking_pig_dog();
278}
279
280static jmp_buf alarmbuf;
281
282void
283timewarn(int timeleft)
284{
285	static int first;
286	static char hostname[MAXHOSTNAMELEN + 1];
287	FILE *pf;
288	char wcmd[MAXPATHLEN + 4];
289
290	if (!first++) {
291		(void)gethostname(hostname, sizeof(hostname));
292		hostname[sizeof(hostname) - 1] = '\0';
293	}
294
295	/* undoc -n option to wall suppresses normal wall banner */
296	(void)snprintf(wcmd, sizeof wcmd, "%s -n", _PATH_WALL);
297	if (!(pf = popen(wcmd, "w"))) {
298		syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
299		return;
300	}
301
302	(void)fprintf(pf,
303	    "\007*** %sSystem shutdown message from %s@%s ***\007\n",
304	    timeleft ? "": "FINAL ", whom, hostname);
305
306	if (timeleft > 10*60)
307		(void)fprintf(pf, "System going down at %5.5s\n\n",
308		    ctime(&shuttime) + 11);
309	else if (timeleft > 59)
310		(void)fprintf(pf, "System going down in %d minute%s\n\n",
311		    timeleft / 60, (timeleft > 60) ? "s" : "");
312	else if (timeleft)
313		(void)fprintf(pf, "System going down in 30 seconds\n\n");
314	else
315		(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
316
317	if (mbuflen)
318		(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
319
320	/*
321	 * play some games, just in case wall doesn't come back
322	 * probably unnecessary, given that wall is careful.
323	 */
324	if (!setjmp(alarmbuf)) {
325		(void)signal(SIGALRM, timeout);
326		(void)alarm((u_int)30);
327		(void)pclose(pf);
328		(void)alarm((u_int)0);
329		(void)signal(SIGALRM, SIG_DFL);
330	}
331}
332
333void
334timeout(int signo)
335{
336	longjmp(alarmbuf, 1);
337}
338
339void
340die_you_gravy_sucking_pig_dog()
341{
342
343	syslog(LOG_NOTICE, "%s by %s: %s",
344	    doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf);
345	(void)sleep(2);
346
347	(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
348	if (killflg) {
349		(void)printf("\rbut you'll have to do it yourself\r\n");
350		finish(0);
351	}
352	if (dofast)
353		doitfast();
354	dorcshutdown();
355	if (doreboot || dohalt) {
356		char *args[16], **arg, *path;
357
358		arg = &args[0];
359		if (doreboot) {
360			path = _PATH_REBOOT;
361			*arg++ = "reboot";
362		} else {
363			path = _PATH_HALT;
364			*arg++ = "halt";
365		}
366		if (dodump)
367			*arg++ = "-d";
368		if (nosync)
369			*arg++ = "-n";
370		if (dopowerdown)
371			*arg++ = "-p";
372		*arg++ = "-l";
373		if (bootstr)
374			*arg++ = bootstr;
375		*arg++ = 0;
376#ifndef DEBUG
377		execve(path, args, (char **)0);
378		syslog(LOG_ERR, "shutdown: can't exec %s: %m", path);
379		perror("shutdown");
380#else
381		printf("%s", path);
382		for (arg = &args[0]; *arg; arg++)
383			printf(" %s", *arg);
384		printf("\n");
385#endif
386	} else {
387#ifndef DEBUG
388		(void)kill(1, SIGTERM);		/* to single user */
389#else
390		printf("kill 1\n");
391#endif
392	}
393	finish(0);
394}
395
396#define	ATOI2(s)	((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
397
398void
399getoffset(char *timearg)
400{
401	struct tm *lt;
402	char *p;
403	time_t now;
404	int yearset;
405
406	(void)time(&now);
407	if (!strcasecmp(timearg, "now")) {		/* now */
408		offset = 0;
409		shuttime = now;
410		return;
411	}
412
413	if (*timearg == '+') {				/* +minutes */
414		if (!isdigit((unsigned char)*++timearg))
415			badtime();
416		offset = atoi(timearg) * 60;
417		shuttime = now + offset;
418		return;
419	}
420
421	/* handle hh:mm by getting rid of the colon */
422	for (p = timearg; *p; ++p)
423		if (!isascii(*p) || !isdigit((unsigned char)*p)) {
424			if (*p == ':' && strlen(p) == 3) {
425				p[0] = p[1];
426				p[1] = p[2];
427				p[2] = '\0';
428			}
429			else
430				badtime();
431		}
432
433	unsetenv("TZ");					/* OUR timezone */
434	lt = localtime(&now);				/* current time val */
435
436	lt->tm_sec = 0;
437
438	yearset = 0;
439	switch (strlen(timearg)) {
440	case 12:
441		lt->tm_year = ATOI2(timearg) * 100 - TM_YEAR_BASE;
442		yearset = 1;
443		/* FALLTHROUGH */
444	case 10:
445		if (yearset) {
446			lt->tm_year += ATOI2(timearg);
447		} else {
448			yearset = ATOI2(timearg);
449			if (yearset < 69)
450				lt->tm_year = yearset + 2000 - TM_YEAR_BASE;
451			else
452				lt->tm_year = yearset + 1900 - TM_YEAR_BASE;
453		}
454		/* FALLTHROUGH */
455	case 8:
456		lt->tm_mon = ATOI2(timearg);
457		--lt->tm_mon;
458		/* FALLTHROUGH */
459	case 6:
460		lt->tm_mday = ATOI2(timearg);
461		/* FALLTHROUGH */
462	case 4:
463		lt->tm_hour = ATOI2(timearg);
464		/* FALLTHROUGH */
465	case 2:
466		lt->tm_min = ATOI2(timearg);
467		break;
468	default:
469		badtime();
470	}
471
472	if ((shuttime = mktime(lt)) == -1)
473		badtime();
474	if ((offset = shuttime - now) < 0)
475		errx(1, "time is already past");
476}
477
478void
479dorcshutdown(void)
480{
481	(void)printf("\r\nAbout to run shutdown hooks...\r\n");
482	(void)system(". " _PATH_RCSHUTDOWN);
483	(void)sleep(5);		/* Give operator a chance to abort this. */
484	(void)printf("\r\nDone running shutdown hooks.\r\n");
485}
486
487#define	FSMSG	"fastboot file for fsck\n"
488void
489doitfast(void)
490{
491	int fastfd;
492
493	if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC,
494	    0664)) >= 0) {
495		(void)write(fastfd, FSMSG, sizeof(FSMSG) - 1);
496		(void)close(fastfd);
497	}
498}
499
500#define	NOMSG	"\n\nNO LOGINS: System going down at "
501void
502nolog(void)
503{
504	int logfd;
505	char *ct;
506
507	(void)unlink(_PATH_NOLOGIN);	/* in case linked to another file */
508	(void)signal(SIGINT, finish);
509	(void)signal(SIGHUP, finish);
510	(void)signal(SIGQUIT, finish);
511	(void)signal(SIGTERM, finish);
512	if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
513	    0664)) >= 0) {
514		(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
515		ct = ctime(&shuttime);
516		(void)write(logfd, ct + 11, 5);
517		(void)write(logfd, "\n\n", 2);
518		(void)write(logfd, mbuf, strlen(mbuf));
519		(void)close(logfd);
520	}
521}
522
523void
524finish(int signo)
525{
526
527	if (!killflg)
528		(void)unlink(_PATH_NOLOGIN);
529	exit(0);
530}
531
532void
533badtime(void)
534{
535
536	warnx("illegal time format");
537	usage();
538}
539
540void
541usage(void)
542{
543
544	(void)fprintf(stderr,
545	    "usage: shutdown [-Ddfhknpr] time [message ... | -]\n");
546	exit(1);
547}
548