shutdown.c revision 1.48 
1/*	$NetBSD: shutdown.c,v 1.48 2007/07/10 23:50:35 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 1.48 2007/07/10 23:50:35 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#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 const char *whom;
95static char mbuf[BUFSIZ];
96static char *bootstr;
97
98static void badtime(void) __attribute__((__noreturn__));
99static void die_you_gravy_sucking_pig_dog(void) __attribute__((__noreturn__));
100static void doitfast(void);
101void dorcshutdown(void);
102static void finish(int) __attribute__((__noreturn__));
103static void getoffset(char *);
104static void loop(void);
105static void nolog(void);
106static void timeout(int);
107static void timewarn(time_t);
108static void usage(void) __attribute__((__noreturn__));
109
110int
111main(int argc, char *argv[])
112{
113	char *p, *endp;
114	struct passwd *pw;
115	size_t arglen, len;
116	int ch;
117
118	(void)setprogname(argv[0]);
119#ifndef DEBUG
120	if (geteuid())
121		errx(1, "NOT super-user");
122#endif
123	while ((ch = getopt(argc, argv, "b:Ddfhknpr")) != -1)
124		switch (ch) {
125		case 'b':
126			bootstr = optarg;
127			break;
128		case 'd':
129			dodump = 1;
130			break;
131		case 'D':
132			nofork = 1;
133			break;
134		case 'f':
135			dofast = 1;
136			break;
137		case 'p':
138			dopowerdown = 1;
139			/* FALLTHROUGH */
140		case 'h':
141			dohalt = 1;
142			break;
143		case 'k':
144			killflg = 1;
145			break;
146		case 'n':
147			nosync = 1;
148			break;
149		case 'r':
150			doreboot = 1;
151			break;
152		case '?':
153		default:
154			usage();
155		}
156	argc -= optind;
157	argv += optind;
158
159	if (argc < 1)
160		usage();
161
162	if (dodump && !dohalt && !doreboot)
163		doreboot = 1;
164
165	if (dofast && nosync) {
166		warnx("incompatible switches -f and -n");
167		usage();
168	}
169	if (dohalt && doreboot) {
170		const char *which_flag = dopowerdown ? "p" : "h";
171
172		warnx("incompatible switches -%s and -r", which_flag);
173		usage();
174	}
175
176	getoffset(*argv++);
177
178	if (argv[0]) {
179		if (strcmp(argv[0], "-") || argv[1]) {
180			for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
181				arglen = strlen(*argv);
182				if ((len -= arglen) <= 2)
183					break;
184				if (p != mbuf)
185					*p++ = ' ';
186				(void)memmove(p, *argv, arglen);
187				p += arglen;
188			}
189			*p = '\n';
190			*++p = '\0';
191		} else {
192			p = mbuf;
193			endp = mbuf + sizeof(mbuf) - 2;
194			for (;;) {
195				if (!fgets(p, endp - p + 1, stdin))
196					break;
197				for (; *p &&  p < endp; ++p);
198				if (p == endp) {
199					*p = '\n';
200					*++p = '\0';
201					break;
202				}
203			}
204		}
205	}
206	mbuflen = strlen(mbuf);
207
208	if (offset)
209		(void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
210	else
211		(void)printf("Shutdown NOW!\n");
212
213	if (!(whom = getlogin()))
214		whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
215
216#ifdef DEBUG
217	(void)putc('\n', stdout);
218#else
219	(void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
220	if (nofork == 0) {
221		int forkpid;
222
223		forkpid = fork();
224		if (forkpid == -1) {
225			perror("shutdown: fork");
226			exit(1);
227		}
228		if (forkpid) {
229			(void)printf("shutdown: [pid %d]\n", forkpid);
230			exit(0);
231		}
232		(void)setsid();
233	}
234#endif
235	openlog("shutdown", LOG_CONS, LOG_AUTH);
236	loop();
237	/* NOTREACHED */
238#ifdef __GNUC__
239	return 1;
240#endif
241}
242
243void
244loop(void)
245{
246	const struct interval *tp;
247	u_int sltime;
248	int logged;
249
250	if (offset <= NOLOG_TIME) {
251		logged = 1;
252		nolog();
253	}
254	else
255		logged = 0;
256	tp = tlist;
257	if (tp->timeleft < offset)
258		(void)sleep((u_int)(offset - tp->timeleft));
259	else {
260		while (offset < tp->timeleft)
261			++tp;
262		/*
263		 * Warn now, if going to sleep more than a fifth of
264		 * the next wait time.
265		 */
266		if ((sltime = offset - tp->timeleft) != 0) {
267			if (sltime > tp->timetowait / 5)
268				timewarn(offset);
269			(void)sleep(sltime);
270		}
271	}
272	for (;; ++tp) {
273		timewarn(tp->timeleft);
274		if (!logged && tp->timeleft <= NOLOG_TIME) {
275			logged = 1;
276			nolog();
277		}
278		(void)sleep((u_int)tp->timetowait);
279		if (!tp->timeleft)
280			break;
281	}
282	die_you_gravy_sucking_pig_dog();
283}
284
285static jmp_buf alarmbuf;
286
287void
288timewarn(time_t timeleft)
289{
290	static int first;
291	static char hostname[MAXHOSTNAMELEN + 1];
292	FILE *pf;
293	char wcmd[MAXPATHLEN + 4];
294
295	if (!first++) {
296		(void)gethostname(hostname, sizeof(hostname));
297		hostname[sizeof(hostname) - 1] = '\0';
298	}
299
300	/* undoc -n option to wall suppresses normal wall banner */
301	(void)snprintf(wcmd, sizeof wcmd, "%s -n", _PATH_WALL);
302	if ((pf = popen(wcmd, "w")) == NULL) {
303		syslog(LOG_ERR, "%s: Can't find `%s' (%m)", getprogname(),
304		    _PATH_WALL);
305		return;
306	}
307
308	(void)fprintf(pf,
309	    "\007*** %sSystem shutdown message from %s@%s ***\007\n",
310	    timeleft ? "": "FINAL ", whom, hostname);
311
312	if (timeleft > 10*60)
313		(void)fprintf(pf, "System going down at %5.5s\n\n",
314		    ctime(&shuttime) + 11);
315	else if (timeleft > 59)
316		(void)fprintf(pf, "System going down in %ld minute%s\n\n",
317		    (long)timeleft / 60, (timeleft > 60) ? "s" : "");
318	else if (timeleft)
319		(void)fprintf(pf, "System going down in 30 seconds\n\n");
320	else
321		(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
322
323	if (mbuflen)
324		(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
325
326	/*
327	 * play some games, just in case wall doesn't come back
328	 * probably unnecessary, given that wall is careful.
329	 */
330	if (!setjmp(alarmbuf)) {
331		(void)signal(SIGALRM, timeout);
332		(void)alarm((u_int)30);
333		(void)pclose(pf);
334		(void)alarm((u_int)0);
335		(void)signal(SIGALRM, SIG_DFL);
336	}
337}
338
339static void
340/*ARGSUSED*/
341timeout(int signo)
342{
343	longjmp(alarmbuf, 1);
344}
345
346static void
347die_you_gravy_sucking_pig_dog(void)
348{
349
350	syslog(LOG_NOTICE, "%s by %s: %s",
351	    doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf);
352	(void)sleep(2);
353
354	(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
355	if (killflg) {
356		(void)printf("\rbut you'll have to do it yourself\r\n");
357		finish(0);
358	}
359	if (dofast)
360		doitfast();
361	dorcshutdown();
362	if (doreboot || dohalt) {
363		const char *args[16];
364		const char **arg, *path;
365#ifndef DEBUG
366		int serrno;
367#endif
368
369		arg = &args[0];
370		if (doreboot) {
371			path = _PATH_REBOOT;
372			*arg++ = "reboot";
373		} else {
374			path = _PATH_HALT;
375			*arg++ = "halt";
376		}
377		if (dodump)
378			*arg++ = "-d";
379		if (nosync)
380			*arg++ = "-n";
381		if (dopowerdown)
382			*arg++ = "-p";
383		*arg++ = "-l";
384		if (bootstr)
385			*arg++ = bootstr;
386		*arg++ = 0;
387#ifndef DEBUG
388		(void)execve(path, __UNCONST(args), NULL);
389		serrno = errno;
390		syslog(LOG_ERR, "%s: Can't exec `%s' (%m)", getprogname(),
391		    path);
392		errno = serrno;
393		warn("Can't exec `%s'", path);
394#else
395		printf("%s", path);
396		for (arg = &args[0]; *arg; arg++)
397			printf(" %s", *arg);
398		printf("\n");
399#endif
400	} else {
401#ifndef DEBUG
402		(void)kill(1, SIGTERM);		/* to single user */
403#else
404		printf("kill 1\n");
405#endif
406	}
407	finish(0);
408}
409
410#define	ATOI2(s)	((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
411
412void
413getoffset(char *timearg)
414{
415	struct tm *lt;
416	char *p;
417	time_t now;
418	int yearset;
419
420	(void)time(&now);
421	if (!strcasecmp(timearg, "now")) {		/* now */
422		offset = 0;
423		shuttime = now;
424		return;
425	}
426
427	if (*timearg == '+') {				/* +minutes */
428		if (!isdigit((unsigned char)*++timearg))
429			badtime();
430		offset = atoi(timearg) * 60;
431		shuttime = now + offset;
432		return;
433	}
434
435	/* handle hh:mm by getting rid of the colon */
436	for (p = timearg; *p; ++p)
437		if (!isascii(*p) || !isdigit((unsigned char)*p)) {
438			if (*p == ':' && strlen(p) == 3) {
439				p[0] = p[1];
440				p[1] = p[2];
441				p[2] = '\0';
442			}
443			else
444				badtime();
445		}
446
447	(void)unsetenv("TZ");				/* OUR timezone */
448	lt = localtime(&now);				/* current time val */
449
450	lt->tm_sec = 0;
451
452	yearset = 0;
453	switch (strlen(timearg)) {
454	case 12:
455		lt->tm_year = ATOI2(timearg) * 100 - TM_YEAR_BASE;
456		yearset = 1;
457		/* FALLTHROUGH */
458	case 10:
459		if (yearset) {
460			lt->tm_year += ATOI2(timearg);
461		} else {
462			yearset = ATOI2(timearg);
463			if (yearset < 69)
464				lt->tm_year = yearset + 2000 - TM_YEAR_BASE;
465			else
466				lt->tm_year = yearset + 1900 - TM_YEAR_BASE;
467		}
468		/* FALLTHROUGH */
469	case 8:
470		lt->tm_mon = ATOI2(timearg);
471		--lt->tm_mon;
472		/* FALLTHROUGH */
473	case 6:
474		lt->tm_mday = ATOI2(timearg);
475		/* FALLTHROUGH */
476	case 4:
477		lt->tm_hour = ATOI2(timearg);
478		/* FALLTHROUGH */
479	case 2:
480		lt->tm_min = ATOI2(timearg);
481		break;
482	default:
483		badtime();
484	}
485
486	if ((shuttime = mktime(lt)) == -1)
487		badtime();
488	if ((offset = shuttime - now) < 0)
489		errx(1, "time is already past");
490}
491
492void
493dorcshutdown(void)
494{
495	(void)printf("\r\nAbout to run shutdown hooks...\r\n");
496#ifndef DEBUG
497	(void)setuid(0);
498	(void)system(". " _PATH_RCSHUTDOWN);
499#endif
500	(void)sleep(5);		/* Give operator a chance to abort this. */
501	(void)printf("\r\nDone running shutdown hooks.\r\n");
502}
503
504#define	FSMSG	"fastboot file for fsck\n"
505void
506doitfast(void)
507{
508	int fastfd;
509
510	if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC,
511	    0664)) >= 0) {
512		(void)write(fastfd, FSMSG, sizeof(FSMSG) - 1);
513		(void)close(fastfd);
514	}
515}
516
517#define	NOMSG	"\n\nNO LOGINS: System going down at "
518void
519nolog(void)
520{
521	int logfd;
522	char *ct;
523
524	(void)unlink(_PATH_NOLOGIN);	/* in case linked to another file */
525	(void)signal(SIGINT, finish);
526	(void)signal(SIGHUP, finish);
527	(void)signal(SIGQUIT, finish);
528	(void)signal(SIGTERM, finish);
529	if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
530	    0664)) >= 0) {
531		(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
532		ct = ctime(&shuttime);
533		(void)write(logfd, ct + 11, 5);
534		(void)write(logfd, "\n\n", 2);
535		(void)write(logfd, mbuf, strlen(mbuf));
536		(void)close(logfd);
537	}
538}
539
540static void
541/*ARGSUSED*/
542finish(int signo)
543{
544
545	if (!killflg)
546		(void)unlink(_PATH_NOLOGIN);
547	exit(0);
548}
549
550static void
551badtime(void)
552{
553
554	warnx("illegal time format");
555	usage();
556}
557
558static void
559usage(void)
560{
561
562	(void)fprintf(stderr,
563	    "Usage: %s [-Ddfhknpr] time [message ... | -]\n",
564	    getprogname());
565	exit(1);
566}
567