shutdown.c revision 1.54 
1/*	$NetBSD: shutdown.c,v 1.54 2011/02/16 19:33:48 wiz 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\
35 The Regents of the University of California.  All rights reserved.");
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 1.54 2011/02/16 19:33:48 wiz 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#include <errno.h>
64
65#include "pathnames.h"
66
67#ifdef DEBUG
68#undef _PATH_NOLOGIN
69#define	_PATH_NOLOGIN	"./nologin"
70#undef _PATH_FASTBOOT
71#define	_PATH_FASTBOOT	"./fastboot"
72#endif
73
74#define	H		*60*60
75#define	M		*60
76#define	S		*1
77#define	NOLOG_TIME	5*60
78static const struct interval {
79	time_t timeleft, timetowait;
80} tlist[] = {
81	{ 10 H,  5 H },	{  5 H,  3 H },	{  2 H,  1 H },	{ 1 H, 30 M },
82	{ 30 M, 10 M },	{ 20 M, 10 M },	{ 10 M,  5 M },	{ 5 M,  3 M },
83	{  2 M,  1 M },	{  1 M, 30 S },	{ 30 S, 30 S },
84	{  0, 0 }
85};
86#undef H
87#undef M
88#undef S
89
90static time_t offset, shuttime;
91static int dofast, dohalt, doreboot, killflg, nofork, nosync, dodump;
92static size_t mbuflen;
93static int dopowerdown;
94static int dodebug, dosilent, doverbose;
95static const char *whom;
96static char mbuf[BUFSIZ];
97static char *bootstr;
98
99static void badtime(void) __dead;
100static void die_you_gravy_sucking_pig_dog(void) __dead;
101static void doitfast(void);
102void dorcshutdown(void);
103static void finish(int) __dead;
104static void getoffset(char *);
105static void loop(void);
106static void nolog(void);
107static void timeout(int);
108static void timewarn(time_t);
109static void usage(void) __dead;
110
111int
112main(int argc, char *argv[])
113{
114	char *p, *endp;
115	struct passwd *pw;
116	size_t arglen, len;
117	int ch;
118
119	(void)setprogname(argv[0]);
120#ifndef DEBUG
121	if (geteuid())
122		errx(1, "%s: Not super-user", strerror(EPERM));
123#endif
124	while ((ch = getopt(argc, argv, "b:Ddfhknprvxz")) != -1)
125		switch (ch) {
126		case 'b':
127			bootstr = optarg;
128			break;
129		case 'd':
130			dodump = 1;
131			break;
132		case 'D':
133			nofork = 1;
134			break;
135		case 'f':
136			dofast = 1;
137			break;
138		case 'p':
139			dopowerdown = 1;
140			/* FALLTHROUGH */
141		case 'h':
142			dohalt = 1;
143			break;
144		case 'k':
145			killflg = 1;
146			break;
147		case 'n':
148			nosync = 1;
149			break;
150		case 'r':
151			doreboot = 1;
152			break;
153		case 'v':
154			doverbose = 1;
155			break;
156		case 'x':
157			dodebug = 1;
158			break;
159		case 'z':
160			dosilent = 1;
161			break;
162		case '?':
163		default:
164			usage();
165		}
166	argc -= optind;
167	argv += optind;
168
169	if (argc < 1)
170		usage();
171
172	if (dodump && !dohalt && !doreboot)
173		doreboot = 1;
174
175	if (dofast && nosync) {
176		warnx("Incompatible options -f and -n");
177		usage();
178	}
179	if (dohalt && doreboot) {
180		const char *which_flag = dopowerdown ? "p" : "h";
181
182		warnx("Incompatible options -%s and -r", which_flag);
183		usage();
184	}
185
186	getoffset(*argv++);
187
188	if (argv[0]) {
189		if (strcmp(argv[0], "-") || argv[1]) {
190			for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
191				arglen = strlen(*argv);
192				if ((len -= arglen) <= 2)
193					break;
194				if (p != mbuf)
195					*p++ = ' ';
196				(void)memmove(p, *argv, arglen);
197				p += arglen;
198			}
199			*p = '\n';
200			*++p = '\0';
201		} else {
202			p = mbuf;
203			endp = mbuf + sizeof(mbuf) - 2;
204			for (;;) {
205				if (!fgets(p, endp - p + 1, stdin))
206					break;
207				for (; *p &&  p < endp; ++p);
208				if (p == endp) {
209					*p = '\n';
210					*++p = '\0';
211					break;
212				}
213			}
214		}
215	}
216	mbuflen = strlen(mbuf);
217
218	if (offset)
219		(void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
220	else
221		(void)printf("Shutdown NOW!\n");
222
223	if (!(whom = getlogin()))
224		whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
225
226#ifdef DEBUG
227	(void)putc('\n', stdout);
228#else
229	(void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
230	if (nofork == 0) {
231		int forkpid;
232
233		forkpid = fork();
234		if (forkpid == -1) {
235			perror("shutdown: fork");
236			exit(1);
237		}
238		if (forkpid) {
239			(void)printf("shutdown: [pid %d]\n", forkpid);
240			exit(0);
241		}
242		(void)setsid();
243	}
244#endif
245	openlog("shutdown", LOG_CONS, LOG_AUTH);
246	loop();
247	/* NOTREACHED */
248#ifdef __GNUC__
249	return 1;
250#endif
251}
252
253void
254loop(void)
255{
256	const struct interval *tp;
257	u_int sltime;
258	int logged;
259
260	if (offset <= NOLOG_TIME) {
261		logged = 1;
262		nolog();
263	}
264	else
265		logged = 0;
266	tp = tlist;
267	if (tp->timeleft < offset)
268		(void)sleep((u_int)(offset - tp->timeleft));
269	else {
270		while (offset < tp->timeleft)
271			++tp;
272		/*
273		 * Warn now, if going to sleep more than a fifth of
274		 * the next wait time.
275		 */
276		if ((sltime = offset - tp->timeleft) != 0) {
277			if (sltime > tp->timetowait / 5)
278				timewarn(offset);
279			(void)sleep(sltime);
280		}
281	}
282	for (;; ++tp) {
283		timewarn(tp->timeleft);
284		if (!logged && tp->timeleft <= NOLOG_TIME) {
285			logged = 1;
286			nolog();
287		}
288		(void)sleep((u_int)tp->timetowait);
289		if (!tp->timeleft)
290			break;
291	}
292	die_you_gravy_sucking_pig_dog();
293}
294
295static jmp_buf alarmbuf;
296
297void
298timewarn(time_t timeleft)
299{
300	static int first;
301	static char hostname[MAXHOSTNAMELEN + 1];
302	FILE *pf;
303	char wcmd[MAXPATHLEN + 4];
304
305	if (!first++) {
306		(void)gethostname(hostname, sizeof(hostname));
307		hostname[sizeof(hostname) - 1] = '\0';
308	}
309
310	/* undoc -n option to wall suppresses normal wall banner */
311	(void)snprintf(wcmd, sizeof wcmd, "%s -n", _PATH_WALL);
312	if ((pf = popen(wcmd, "w")) == NULL) {
313		syslog(LOG_ERR, "%s: Can't find `%s' (%m)", getprogname(),
314		    _PATH_WALL);
315		return;
316	}
317
318	(void)fprintf(pf,
319	    "\007*** %sSystem shutdown message from %s@%s ***\007\n",
320	    timeleft ? "": "FINAL ", whom, hostname);
321
322	if (timeleft > 10*60)
323		(void)fprintf(pf, "System going down at %5.5s\n\n",
324		    ctime(&shuttime) + 11);
325	else if (timeleft > 59)
326		(void)fprintf(pf, "System going down in %ld minute%s\n\n",
327		    (long)timeleft / 60, (timeleft > 60) ? "s" : "");
328	else if (timeleft)
329		(void)fprintf(pf, "System going down in 30 seconds\n\n");
330	else
331		(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
332
333	if (mbuflen)
334		(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
335
336	/*
337	 * play some games, just in case wall doesn't come back
338	 * probably unnecessary, given that wall is careful.
339	 */
340	if (!setjmp(alarmbuf)) {
341		(void)signal(SIGALRM, timeout);
342		(void)alarm((u_int)30);
343		(void)pclose(pf);
344		(void)alarm((u_int)0);
345		(void)signal(SIGALRM, SIG_DFL);
346	}
347}
348
349static void
350/*ARGSUSED*/
351timeout(int signo)
352{
353	longjmp(alarmbuf, 1);
354}
355
356static void
357die_you_gravy_sucking_pig_dog(void)
358{
359	const char *what;
360
361	if (doreboot) {
362		what = "reboot";
363	} else if (dohalt && dopowerdown) {
364		what = "poweroff";
365	} else if (dohalt) {
366		what = "halt";
367	} else {
368		what = "shutdown";
369	}
370
371	syslog(LOG_NOTICE, "%s by %s: %s", what, whom, mbuf);
372	(void)sleep(2);
373
374	(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
375	if (killflg) {
376		(void)printf("\rbut you'll have to do it yourself\r\n");
377		finish(0);
378	}
379	if (dofast)
380		doitfast();
381	dorcshutdown();
382	if (doreboot || dohalt) {
383		const char *args[20];
384		const char **arg, *path;
385#ifndef DEBUG
386		int serrno;
387#endif
388
389		arg = &args[0];
390		if (doreboot) {
391			path = _PATH_REBOOT;
392			*arg++ = "reboot";
393		} else {
394			path = _PATH_HALT;
395			*arg++ = "halt";
396		}
397		if (doverbose)
398			*arg++ = "-v";
399		if (dodebug)
400			*arg++ = "-x";
401		if (dosilent)
402			*arg++ = "-z";
403		if (dodump)
404			*arg++ = "-d";
405		if (nosync)
406			*arg++ = "-n";
407		if (dopowerdown)
408			*arg++ = "-p";
409		*arg++ = "-l";
410		if (bootstr)
411			*arg++ = bootstr;
412		*arg++ = 0;
413#ifndef DEBUG
414		(void)unlink(_PATH_NOLOGIN);
415		(void)execve(path, __UNCONST(args), NULL);
416		serrno = errno;
417		syslog(LOG_ERR, "Can't exec `%s' (%m)", path);
418		errno = serrno;
419		warn("Can't exec `%s'", path);
420#else
421		printf("%s", path);
422		for (arg = &args[0]; *arg; arg++)
423			printf(" %s", *arg);
424		printf("\n");
425#endif
426	} else {
427#ifndef DEBUG
428		(void)kill(1, SIGTERM);		/* to single user */
429#else
430		printf("kill 1\n");
431#endif
432	}
433	finish(0);
434}
435
436#define	ATOI2(s)	((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
437
438void
439getoffset(char *timearg)
440{
441	struct tm *lt;
442	char *p;
443	time_t now;
444	int yearset;
445
446	(void)time(&now);
447	if (!strcasecmp(timearg, "now")) {		/* now */
448		offset = 0;
449		shuttime = now;
450		return;
451	}
452
453	if (*timearg == '+') {				/* +minutes */
454		if (!isdigit((unsigned char)*++timearg))
455			badtime();
456		offset = atoi(timearg) * 60;
457		shuttime = now + offset;
458		return;
459	}
460
461	/* handle hh:mm by getting rid of the colon */
462	for (p = timearg; *p; ++p)
463		if (!isascii(*p) || !isdigit((unsigned char)*p)) {
464			if (*p == ':' && strlen(p) == 3) {
465				p[0] = p[1];
466				p[1] = p[2];
467				p[2] = '\0';
468			}
469			else
470				badtime();
471		}
472
473	(void)unsetenv("TZ");				/* OUR timezone */
474	lt = localtime(&now);				/* current time val */
475
476	lt->tm_sec = 0;
477
478	yearset = 0;
479	switch (strlen(timearg)) {
480	case 12:
481		lt->tm_year = ATOI2(timearg) * 100 - TM_YEAR_BASE;
482		yearset = 1;
483		/* FALLTHROUGH */
484	case 10:
485		if (yearset) {
486			lt->tm_year += ATOI2(timearg);
487		} else {
488			yearset = ATOI2(timearg);
489			if (yearset < 69)
490				lt->tm_year = yearset + 2000 - TM_YEAR_BASE;
491			else
492				lt->tm_year = yearset + 1900 - TM_YEAR_BASE;
493		}
494		/* FALLTHROUGH */
495	case 8:
496		lt->tm_mon = ATOI2(timearg);
497		--lt->tm_mon;
498		/* FALLTHROUGH */
499	case 6:
500		lt->tm_mday = ATOI2(timearg);
501		/* FALLTHROUGH */
502	case 4:
503		lt->tm_hour = ATOI2(timearg);
504		/* FALLTHROUGH */
505	case 2:
506		lt->tm_min = ATOI2(timearg);
507		break;
508	default:
509		badtime();
510	}
511
512	if ((shuttime = mktime(lt)) == -1)
513		badtime();
514	if ((offset = shuttime - now) < 0)
515		errx(1, "time is already past");
516}
517
518void
519dorcshutdown(void)
520{
521	(void)printf("\r\nAbout to run shutdown hooks...\r\n");
522#ifndef DEBUG
523	(void)setuid(0);
524	(void)system(". " _PATH_RCSHUTDOWN);
525#endif
526	(void)sleep(5);		/* Give operator a chance to abort this. */
527	(void)printf("\r\nDone running shutdown hooks.\r\n");
528}
529
530#define	FSMSG	"fastboot file for fsck\n"
531void
532doitfast(void)
533{
534	int fastfd;
535
536	if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC,
537	    0664)) >= 0) {
538		(void)write(fastfd, FSMSG, sizeof(FSMSG) - 1);
539		(void)close(fastfd);
540	}
541}
542
543#define	NOMSG	"\n\nNO LOGINS: System going down at "
544void
545nolog(void)
546{
547	int logfd;
548	char *ct;
549
550	(void)unlink(_PATH_NOLOGIN);	/* in case linked to another file */
551	(void)signal(SIGINT, finish);
552	(void)signal(SIGHUP, finish);
553	(void)signal(SIGQUIT, finish);
554	(void)signal(SIGTERM, finish);
555	if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
556	    0664)) >= 0) {
557		(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
558		ct = ctime(&shuttime);
559		(void)write(logfd, ct + 11, 5);
560		(void)write(logfd, "\n\n", 2);
561		(void)write(logfd, mbuf, strlen(mbuf));
562		(void)close(logfd);
563	}
564}
565
566static void
567/*ARGSUSED*/
568finish(int signo)
569{
570
571	if (!killflg)
572		(void)unlink(_PATH_NOLOGIN);
573	exit(0);
574}
575
576static void
577badtime(void)
578{
579
580	warnx("illegal time format");
581	usage();
582}
583
584static void
585usage(void)
586{
587
588	(void)fprintf(stderr,
589	    "Usage: %s [-Ddfhknprvxz] [-b bootstr] time [message ... | -]\n",
590	    getprogname());
591	exit(1);
592}
593