shutdown.c revision 1.19 
1/*	$NetBSD: shutdown.c,v 1.19 1998/01/20 22:30:15 mycroft 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. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <sys/cdefs.h>
37#ifndef lint
38__COPYRIGHT("@(#) Copyright (c) 1988, 1990, 1993\n\
39	The Regents of the University of California.  All rights reserved.\n");
40#endif /* not lint */
41
42#ifndef lint
43#if 0
44static char sccsid[] = "@(#)shutdown.c	8.4 (Berkeley) 4/28/95";
45#else
46__RCSID("$NetBSD: shutdown.c,v 1.19 1998/01/20 22:30:15 mycroft Exp $");
47#endif
48#endif /* not lint */
49
50#include <sys/param.h>
51#include <sys/time.h>
52#include <sys/resource.h>
53#include <sys/syslog.h>
54
55#include <ctype.h>
56#include <err.h>
57#include <fcntl.h>
58#include <pwd.h>
59#include <setjmp.h>
60#include <signal.h>
61#include <stdio.h>
62#include <stdlib.h>
63#include <string.h>
64#include <tzfile.h>
65#include <unistd.h>
66
67#include "pathnames.h"
68
69#ifdef DEBUG
70#undef _PATH_NOLOGIN
71#define	_PATH_NOLOGIN	"./nologin"
72#undef _PATH_FASTBOOT
73#define	_PATH_FASTBOOT	"./fastboot"
74#endif
75
76#define	H		*60*60
77#define	M		*60
78#define	S		*1
79#define	NOLOG_TIME	5*60
80struct interval {
81	int timeleft, timetowait;
82} tlist[] = {
83	{ 10 H,  5 H },	{  5 H,  3 H },	{  2 H,  1 H },	{ 1 H, 30 M },
84	{ 30 M, 10 M },	{ 20 M, 10 M },	{ 10 M,  5 M },	{ 5 M,  3 M },
85	{  2 M,  1 M },	{  1 M, 30 S },	{ 30 S, 30 S },
86	{  0, 0 }
87};
88#undef H
89#undef M
90#undef S
91
92static time_t offset, shuttime;
93static int dofast, dohalt, doreboot, killflg, mbuflen, nosync, dodump;
94static char *whom, mbuf[BUFSIZ];
95
96void badtime __P((void));
97void die_you_gravy_sucking_pig_dog __P((void));
98void doitfast __P((void));
99void finish __P((int));
100void getoffset __P((char *));
101void loop __P((void));
102int main __P((int, char *[]));
103void nolog __P((void));
104void timeout __P((int));
105void timewarn __P((int));
106void usage __P((void));
107
108int
109main(argc, argv)
110	int argc;
111	char *argv[];
112{
113	char *p, *endp;
114	struct passwd *pw;
115	int arglen, ch, len;
116
117#ifndef DEBUG
118	if (geteuid())
119		errx(1, "NOT super-user");
120#endif
121	while ((ch = getopt(argc, argv, "dfhknr")) != -1)
122		switch (ch) {
123		case 'd':
124			dodump = 1;
125			break;
126		case 'f':
127			dofast = 1;
128			break;
129		case 'h':
130			dohalt = 1;
131			break;
132		case 'k':
133			killflg = 1;
134			break;
135		case 'n':
136			nosync = 1;
137			break;
138		case 'r':
139			doreboot = 1;
140			break;
141		case '?':
142		default:
143			usage();
144		}
145	argc -= optind;
146	argv += optind;
147
148	if (argc < 1)
149		usage();
150
151	if (dofast && nosync) {
152		warnx("incompatible switches -f and -n\n");
153		usage();
154	}
155	if (doreboot && dohalt) {
156		warnx("incompatible switches -h and -r\n");
157		usage();
158	}
159
160	getoffset(*argv++);
161
162	if (*argv)
163		if (strcmp(*argv, "-")) {
164			for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
165				arglen = strlen(*argv);
166				if ((len -= arglen) <= 2)
167					break;
168				if (p != mbuf)
169					*p++ = ' ';
170				memmove(p, *argv, arglen);
171				p += arglen;
172			}
173			*p = '\n';
174			*++p = '\0';
175		} else {
176			p = mbuf;
177			endp = mbuf + sizeof(mbuf) - 2;
178			for (;;) {
179				if (!fgets(p, endp - p + 1, stdin))
180					break;
181				for (; *p &&  p < endp; ++p);
182				if (p == endp) {
183					*p = '\n';
184					*++p = '\0';
185					break;
186				}
187			}
188		}
189	mbuflen = strlen(mbuf);
190
191	if (offset)
192		(void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
193	else
194		(void)printf("Shutdown NOW!\n");
195
196	if (!(whom = getlogin()))
197		whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
198
199#ifdef DEBUG
200	(void)putc('\n', stdout);
201#else
202	(void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
203	{
204		int forkpid;
205
206		forkpid = fork();
207		if (forkpid == -1) {
208			perror("shutdown: fork");
209			exit(1);
210		}
211		if (forkpid) {
212			(void)printf("shutdown: [pid %d]\n", forkpid);
213			exit(0);
214		}
215	}
216#endif
217	openlog("shutdown", LOG_CONS, LOG_AUTH);
218	loop();
219	/* NOTREACHED */
220#ifdef __GNUC__
221	return 1;
222#endif
223}
224
225void
226loop()
227{
228	struct interval *tp;
229	u_int sltime;
230	int logged;
231
232	if (offset <= NOLOG_TIME) {
233		logged = 1;
234		nolog();
235	}
236	else
237		logged = 0;
238	tp = tlist;
239	if (tp->timeleft < offset)
240		(void)sleep((u_int)(offset - tp->timeleft));
241	else {
242		while (offset < tp->timeleft)
243			++tp;
244		/*
245		 * Warn now, if going to sleep more than a fifth of
246		 * the next wait time.
247		 */
248		if ((sltime = offset - tp->timeleft) != 0) {
249			if (sltime > tp->timetowait / 5)
250				timewarn(offset);
251			(void)sleep(sltime);
252		}
253	}
254	for (;; ++tp) {
255		timewarn(tp->timeleft);
256		if (!logged && tp->timeleft <= NOLOG_TIME) {
257			logged = 1;
258			nolog();
259		}
260		(void)sleep((u_int)tp->timetowait);
261		if (!tp->timeleft)
262			break;
263	}
264	die_you_gravy_sucking_pig_dog();
265}
266
267static jmp_buf alarmbuf;
268
269void
270timewarn(timeleft)
271	int timeleft;
272{
273	static int first;
274	static char hostname[MAXHOSTNAMELEN + 1];
275	FILE *pf;
276	char wcmd[MAXPATHLEN + 4];
277
278	if (!first++)
279		(void)gethostname(hostname, sizeof(hostname));
280
281	/* undoc -n option to wall suppresses normal wall banner */
282	(void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL);
283	if (!(pf = popen(wcmd, "w"))) {
284		syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
285		return;
286	}
287
288	(void)fprintf(pf,
289	    "\007*** %sSystem shutdown message from %s@%s ***\007\n",
290	    timeleft ? "": "FINAL ", whom, hostname);
291
292	if (timeleft > 10*60)
293		(void)fprintf(pf, "System going down at %5.5s\n\n",
294		    ctime(&shuttime) + 11);
295	else if (timeleft > 59)
296		(void)fprintf(pf, "System going down in %d minute%s\n\n",
297		    timeleft / 60, (timeleft > 60) ? "s" : "");
298	else if (timeleft)
299		(void)fprintf(pf, "System going down in 30 seconds\n\n");
300	else
301		(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
302
303	if (mbuflen)
304		(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
305
306	/*
307	 * play some games, just in case wall doesn't come back
308	 * probably unecessary, given that wall is careful.
309	 */
310	if (!setjmp(alarmbuf)) {
311		(void)signal(SIGALRM, timeout);
312		(void)alarm((u_int)30);
313		(void)pclose(pf);
314		(void)alarm((u_int)0);
315		(void)signal(SIGALRM, SIG_DFL);
316	}
317}
318
319void
320timeout(signo)
321	int signo;
322{
323	longjmp(alarmbuf, 1);
324}
325
326void
327die_you_gravy_sucking_pig_dog()
328{
329
330	syslog(LOG_NOTICE, "%s by %s: %s",
331	    doreboot || dodump ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf);
332	(void)sleep(2);
333
334	(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
335	if (killflg) {
336		(void)printf("\rbut you'll have to do it yourself\r\n");
337		finish(0);
338	}
339	if (dofast)
340		doitfast();
341#ifdef DEBUG
342	if (doreboot || dodump)
343		(void)printf("reboot%s", dodump ? " -d" : "");
344	else if (dohalt)
345		(void)printf("halt");
346	if (nosync)
347		(void)printf(" no sync");
348	if (dofast)
349		(void)printf(" no fsck");
350	(void)printf("\nkill -HUP 1\n");
351#else
352	if (doreboot || dodump) {
353		execle(_PATH_REBOOT, "reboot",
354		       dodump ? (nosync ? "-ldn" : "-ld") :
355		       (nosync ? "-ln" : "-l"), 0, (char **)0);
356		syslog(LOG_ERR, "shutdown: can't exec %s: %m", _PATH_REBOOT);
357		perror("shutdown");
358	}
359	else if (dohalt) {
360		execle(_PATH_HALT, "halt", nosync ? "-ln" : "-l",
361		    (char *)0, (char **)0);
362		syslog(LOG_ERR, "shutdown: can't exec %s: %m", _PATH_HALT);
363		perror("shutdown");
364	}
365	(void)kill(1, SIGTERM);		/* to single user */
366#endif
367	finish(0);
368}
369
370#define	ATOI2(p)	(p[0] - '0') * 10 + (p[1] - '0'); p += 2;
371
372void
373getoffset(timearg)
374	char *timearg;
375{
376	struct tm *lt;
377	char *p;
378	time_t now;
379	int yearset;
380
381	if (!strcasecmp(timearg, "now")) {		/* now */
382		offset = 0;
383		return;
384	}
385
386	(void)time(&now);
387	if (*timearg == '+') {				/* +minutes */
388		if (!isdigit(*++timearg))
389			badtime();
390		offset = atoi(timearg) * 60;
391		shuttime = now + offset;
392		return;
393	}
394
395	/* handle hh:mm by getting rid of the colon */
396	for (p = timearg; *p; ++p)
397		if (!isascii(*p) || !isdigit(*p))
398			if (*p == ':' && strlen(p) == 3) {
399				p[0] = p[1];
400				p[1] = p[2];
401				p[2] = '\0';
402			}
403			else
404				badtime();
405
406	unsetenv("TZ");					/* OUR timezone */
407	lt = localtime(&now);				/* current time val */
408
409	lt->tm_sec = 0;
410
411	yearset = 0;
412	switch (strlen(timearg)) {
413	case 12:
414		lt->tm_year = ATOI2(timearg);
415		lt->tm_year *= 100;
416		yearset = 1;
417		/* FALLTHROUGH */
418	case 10:
419		if (yearset) {
420			yearset = ATOI2(timearg);
421			lt->tm_year += yearset;
422		} else {
423			yearset = ATOI2(timearg);
424			if (yearset < 69)
425				lt->tm_year = yearset + 2000;
426			else
427				lt->tm_year = yearset + 1900;
428		}
429		lt->tm_year -= TM_YEAR_BASE;
430		/* FALLTHROUGH */
431	case 8:
432		lt->tm_mon = ATOI2(timearg);
433		--lt->tm_mon;
434		/* FALLTHROUGH */
435	case 6:
436		lt->tm_mday = ATOI2(timearg);
437		/* FALLTHROUGH */
438	case 4:
439		lt->tm_hour = ATOI2(timearg);
440		/* FALLTHROUGH */
441	case 2:
442		lt->tm_min = ATOI2(timearg);
443		break;
444	default:
445		badtime();
446	}
447
448	if ((shuttime = mktime(lt)) == -1)
449		badtime();
450	if ((offset = shuttime - now) < 0)
451		errx(1, "time is already past");
452}
453
454#define	FSMSG	"fastboot file for fsck\n"
455void
456doitfast()
457{
458	int fastfd;
459
460	if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC,
461	    0664)) >= 0) {
462		(void)write(fastfd, FSMSG, sizeof(FSMSG) - 1);
463		(void)close(fastfd);
464	}
465}
466
467#define	NOMSG	"\n\nNO LOGINS: System going down at "
468void
469nolog()
470{
471	int logfd;
472	char *ct;
473
474	(void)unlink(_PATH_NOLOGIN);	/* in case linked to another file */
475	(void)signal(SIGINT, finish);
476	(void)signal(SIGHUP, finish);
477	(void)signal(SIGQUIT, finish);
478	(void)signal(SIGTERM, finish);
479	if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
480	    0664)) >= 0) {
481		(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
482		ct = ctime(&shuttime);
483		(void)write(logfd, ct + 11, 5);
484		(void)write(logfd, "\n\n", 2);
485		(void)write(logfd, mbuf, strlen(mbuf));
486		(void)close(logfd);
487	}
488}
489
490void
491finish(signo)
492	int signo;
493{
494	if (!killflg)
495		(void)unlink(_PATH_NOLOGIN);
496	exit(0);
497}
498
499void
500badtime()
501{
502	warnx("illegal time format");
503	usage();
504}
505
506void
507usage()
508{
509	(void)fprintf(stderr,
510	    "usage: shutdown [-dfhknr] [[[[[cc]yy]mm]dd]hh]mm [message|-]\n");
511	(void)fprintf(stderr,
512	    "       shutdown [-dfhknr] +time [message|-]\n");
513	exit(1);
514}
515