shutdown.c revision 1.46 
1/*	$NetBSD: shutdown.c,v 1.46 2006/03/07 22:19:55 jnemeth 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 1.46 2006/03/07 22:19:55 jnemeth 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		(void)setsid();
229	}
230#endif
231	openlog("shutdown", LOG_CONS, LOG_AUTH);
232	loop();
233	/* NOTREACHED */
234#ifdef __GNUC__
235	return 1;
236#endif
237}
238
239void
240loop(void)
241{
242	struct interval *tp;
243	u_int sltime;
244	int logged;
245
246	if (offset <= NOLOG_TIME) {
247		logged = 1;
248		nolog();
249	}
250	else
251		logged = 0;
252	tp = tlist;
253	if (tp->timeleft < offset)
254		(void)sleep((u_int)(offset - tp->timeleft));
255	else {
256		while (offset < tp->timeleft)
257			++tp;
258		/*
259		 * Warn now, if going to sleep more than a fifth of
260		 * the next wait time.
261		 */
262		if ((sltime = offset - tp->timeleft) != 0) {
263			if (sltime > tp->timetowait / 5)
264				timewarn(offset);
265			(void)sleep(sltime);
266		}
267	}
268	for (;; ++tp) {
269		timewarn(tp->timeleft);
270		if (!logged && tp->timeleft <= NOLOG_TIME) {
271			logged = 1;
272			nolog();
273		}
274		(void)sleep((u_int)tp->timetowait);
275		if (!tp->timeleft)
276			break;
277	}
278	die_you_gravy_sucking_pig_dog();
279}
280
281static jmp_buf alarmbuf;
282
283void
284timewarn(int timeleft)
285{
286	static int first;
287	static char hostname[MAXHOSTNAMELEN + 1];
288	FILE *pf;
289	char wcmd[MAXPATHLEN + 4];
290
291	if (!first++) {
292		(void)gethostname(hostname, sizeof(hostname));
293		hostname[sizeof(hostname) - 1] = '\0';
294	}
295
296	/* undoc -n option to wall suppresses normal wall banner */
297	(void)snprintf(wcmd, sizeof wcmd, "%s -n", _PATH_WALL);
298	if (!(pf = popen(wcmd, "w"))) {
299		syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
300		return;
301	}
302
303	(void)fprintf(pf,
304	    "\007*** %sSystem shutdown message from %s@%s ***\007\n",
305	    timeleft ? "": "FINAL ", whom, hostname);
306
307	if (timeleft > 10*60)
308		(void)fprintf(pf, "System going down at %5.5s\n\n",
309		    ctime(&shuttime) + 11);
310	else if (timeleft > 59)
311		(void)fprintf(pf, "System going down in %d minute%s\n\n",
312		    timeleft / 60, (timeleft > 60) ? "s" : "");
313	else if (timeleft)
314		(void)fprintf(pf, "System going down in 30 seconds\n\n");
315	else
316		(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
317
318	if (mbuflen)
319		(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
320
321	/*
322	 * play some games, just in case wall doesn't come back
323	 * probably unnecessary, given that wall is careful.
324	 */
325	if (!setjmp(alarmbuf)) {
326		(void)signal(SIGALRM, timeout);
327		(void)alarm((u_int)30);
328		(void)pclose(pf);
329		(void)alarm((u_int)0);
330		(void)signal(SIGALRM, SIG_DFL);
331	}
332}
333
334void
335timeout(int signo)
336{
337	longjmp(alarmbuf, 1);
338}
339
340void
341die_you_gravy_sucking_pig_dog(void)
342{
343
344	syslog(LOG_NOTICE, "%s by %s: %s",
345	    doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf);
346	(void)sleep(2);
347
348	(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
349	if (killflg) {
350		(void)printf("\rbut you'll have to do it yourself\r\n");
351		finish(0);
352	}
353	if (dofast)
354		doitfast();
355	dorcshutdown();
356	if (doreboot || dohalt) {
357		const char *args[16];
358		const char **arg, *path;
359
360		arg = &args[0];
361		if (doreboot) {
362			path = _PATH_REBOOT;
363			*arg++ = "reboot";
364		} else {
365			path = _PATH_HALT;
366			*arg++ = "halt";
367		}
368		if (dodump)
369			*arg++ = "-d";
370		if (nosync)
371			*arg++ = "-n";
372		if (dopowerdown)
373			*arg++ = "-p";
374		*arg++ = "-l";
375		if (bootstr)
376			*arg++ = bootstr;
377		*arg++ = 0;
378#ifndef DEBUG
379		execve(path, __UNCONST(args), NULL);
380		syslog(LOG_ERR, "shutdown: can't exec %s: %m", path);
381		perror("shutdown");
382#else
383		printf("%s", path);
384		for (arg = &args[0]; *arg; arg++)
385			printf(" %s", *arg);
386		printf("\n");
387#endif
388	} else {
389#ifndef DEBUG
390		(void)kill(1, SIGTERM);		/* to single user */
391#else
392		printf("kill 1\n");
393#endif
394	}
395	finish(0);
396}
397
398#define	ATOI2(s)	((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
399
400void
401getoffset(char *timearg)
402{
403	struct tm *lt;
404	char *p;
405	time_t now;
406	int yearset;
407
408	(void)time(&now);
409	if (!strcasecmp(timearg, "now")) {		/* now */
410		offset = 0;
411		shuttime = now;
412		return;
413	}
414
415	if (*timearg == '+') {				/* +minutes */
416		if (!isdigit((unsigned char)*++timearg))
417			badtime();
418		offset = atoi(timearg) * 60;
419		shuttime = now + offset;
420		return;
421	}
422
423	/* handle hh:mm by getting rid of the colon */
424	for (p = timearg; *p; ++p)
425		if (!isascii(*p) || !isdigit((unsigned char)*p)) {
426			if (*p == ':' && strlen(p) == 3) {
427				p[0] = p[1];
428				p[1] = p[2];
429				p[2] = '\0';
430			}
431			else
432				badtime();
433		}
434
435	unsetenv("TZ");					/* OUR timezone */
436	lt = localtime(&now);				/* current time val */
437
438	lt->tm_sec = 0;
439
440	yearset = 0;
441	switch (strlen(timearg)) {
442	case 12:
443		lt->tm_year = ATOI2(timearg) * 100 - TM_YEAR_BASE;
444		yearset = 1;
445		/* FALLTHROUGH */
446	case 10:
447		if (yearset) {
448			lt->tm_year += ATOI2(timearg);
449		} else {
450			yearset = ATOI2(timearg);
451			if (yearset < 69)
452				lt->tm_year = yearset + 2000 - TM_YEAR_BASE;
453			else
454				lt->tm_year = yearset + 1900 - TM_YEAR_BASE;
455		}
456		/* FALLTHROUGH */
457	case 8:
458		lt->tm_mon = ATOI2(timearg);
459		--lt->tm_mon;
460		/* FALLTHROUGH */
461	case 6:
462		lt->tm_mday = ATOI2(timearg);
463		/* FALLTHROUGH */
464	case 4:
465		lt->tm_hour = ATOI2(timearg);
466		/* FALLTHROUGH */
467	case 2:
468		lt->tm_min = ATOI2(timearg);
469		break;
470	default:
471		badtime();
472	}
473
474	if ((shuttime = mktime(lt)) == -1)
475		badtime();
476	if ((offset = shuttime - now) < 0)
477		errx(1, "time is already past");
478}
479
480void
481dorcshutdown(void)
482{
483	(void)printf("\r\nAbout to run shutdown hooks...\r\n");
484	(void)system(". " _PATH_RCSHUTDOWN);
485	(void)sleep(5);		/* Give operator a chance to abort this. */
486	(void)printf("\r\nDone running shutdown hooks.\r\n");
487}
488
489#define	FSMSG	"fastboot file for fsck\n"
490void
491doitfast(void)
492{
493	int fastfd;
494
495	if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC,
496	    0664)) >= 0) {
497		(void)write(fastfd, FSMSG, sizeof(FSMSG) - 1);
498		(void)close(fastfd);
499	}
500}
501
502#define	NOMSG	"\n\nNO LOGINS: System going down at "
503void
504nolog(void)
505{
506	int logfd;
507	char *ct;
508
509	(void)unlink(_PATH_NOLOGIN);	/* in case linked to another file */
510	(void)signal(SIGINT, finish);
511	(void)signal(SIGHUP, finish);
512	(void)signal(SIGQUIT, finish);
513	(void)signal(SIGTERM, finish);
514	if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
515	    0664)) >= 0) {
516		(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
517		ct = ctime(&shuttime);
518		(void)write(logfd, ct + 11, 5);
519		(void)write(logfd, "\n\n", 2);
520		(void)write(logfd, mbuf, strlen(mbuf));
521		(void)close(logfd);
522	}
523}
524
525void
526finish(int signo)
527{
528
529	if (!killflg)
530		(void)unlink(_PATH_NOLOGIN);
531	exit(0);
532}
533
534void
535badtime(void)
536{
537
538	warnx("illegal time format");
539	usage();
540}
541
542void
543usage(void)
544{
545
546	(void)fprintf(stderr,
547	    "usage: shutdown [-Ddfhknpr] time [message ... | -]\n");
548	exit(1);
549}
550