shutdown.c revision 41684 
1/*
2 * Copyright (c) 1988, 1990, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1988, 1990, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)shutdown.c	8.4 (Berkeley) 4/28/95";
43#endif
44static const char rcsid[] =
45	"$Id: shutdown.c,v 1.15 1998/12/11 11:04:19 bde Exp $";
46#endif /* not lint */
47
48#include <sys/param.h>
49#include <sys/time.h>
50#include <sys/resource.h>
51#include <sys/syslog.h>
52
53#include <ctype.h>
54#include <err.h>
55#include <fcntl.h>
56#include <pwd.h>
57#include <setjmp.h>
58#include <signal.h>
59#include <stdio.h>
60#include <stdlib.h>
61#include <string.h>
62#include <unistd.h>
63
64#include "pathnames.h"
65
66#ifdef DEBUG
67#undef _PATH_NOLOGIN
68#define	_PATH_NOLOGIN	"./nologin"
69#endif
70
71#define	H		*60*60
72#define	M		*60
73#define	S		*1
74#define	NOLOG_TIME	5*60
75struct interval {
76	int timeleft, timetowait;
77} tlist[] = {
78	{ 10 H,  5 H },
79	{  5 H,  3 H },
80	{  2 H,  1 H },
81	{  1 H, 30 M },
82	{ 30 M, 10 M },
83	{ 20 M, 10 M },
84	{ 10 M,  5 M },
85	{  5 M,  3 M },
86	{  2 M,  1 M },
87	{  1 M, 30 S },
88	{ 30 S, 30 S },
89	{  0  ,  0   }
90};
91#undef H
92#undef M
93#undef S
94
95static time_t offset, shuttime;
96static int dohalt, dopower, doreboot, killflg, mbuflen;
97static char *nosync, *whom, mbuf[BUFSIZ];
98
99void badtime __P((void));
100void die_you_gravy_sucking_pig_dog __P((void));
101void finish __P((int));
102void getoffset __P((char *));
103void loop __P((void));
104void nolog __P((void));
105void timeout __P((int));
106void timewarn __P((int));
107void usage __P((void));
108
109int
110main(argc, argv)
111	int argc;
112	char *argv[];
113{
114	register char *p, *endp;
115	struct passwd *pw;
116	int arglen, ch, len, readstdin;
117
118#ifndef DEBUG
119	if (geteuid())
120		errx(1, "NOT super-user");
121#endif
122	nosync = NULL;
123	readstdin = 0;
124	while ((ch = getopt(argc, argv, "-hknpr")) != -1)
125		switch (ch) {
126		case '-':
127			readstdin = 1;
128			break;
129		case 'h':
130			dohalt = 1;
131			break;
132		case 'k':
133			killflg = 1;
134			break;
135		case 'n':
136			nosync = "-n";
137			break;
138		case 'p':
139			dopower = 1;
140			break;
141		case 'r':
142			doreboot = 1;
143			break;
144		case '?':
145		default:
146			usage();
147		}
148	argc -= optind;
149	argv += optind;
150
151	if (argc < 1)
152		usage();
153
154	if (doreboot + dohalt + dopower > 1) {
155		warnx("incompatible switches -h, -p and -r");
156		usage();
157	}
158	getoffset(*argv++);
159
160	if (*argv) {
161		for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
162			arglen = strlen(*argv);
163			if ((len -= arglen) <= 2)
164				break;
165			if (p != mbuf)
166				*p++ = ' ';
167			memmove(p, *argv, arglen);
168			p += arglen;
169		}
170		*p = '\n';
171		*++p = '\0';
172	}
173
174	if (readstdin) {
175		p = mbuf;
176		endp = mbuf + sizeof(mbuf) - 2;
177		for (;;) {
178			if (!fgets(p, endp - p + 1, stdin))
179				break;
180			for (; *p &&  p < endp; ++p);
181			if (p == endp) {
182				*p = '\n';
183				*++p = '\0';
184				break;
185			}
186		}
187	}
188	mbuflen = strlen(mbuf);
189
190	if (offset)
191		(void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
192	else
193		(void)printf("Shutdown NOW!\n");
194
195	if (!(whom = getlogin()))
196		whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
197
198#ifdef DEBUG
199	(void)putc('\n', stdout);
200#else
201	(void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
202	{
203		int forkpid;
204
205		forkpid = fork();
206		if (forkpid == -1)
207			err(1, "fork");
208		if (forkpid)
209			errx(0, "[pid %d]", forkpid);
210	}
211	setsid();
212#endif
213	openlog("shutdown", LOG_CONS, LOG_AUTH);
214	loop();
215	return(0);
216}
217
218void
219loop()
220{
221	struct interval *tp;
222	u_int sltime;
223	int logged;
224
225	if (offset <= NOLOG_TIME) {
226		logged = 1;
227		nolog();
228	}
229	else
230		logged = 0;
231	tp = tlist;
232	if (tp->timeleft < offset)
233		(void)sleep((u_int)(offset - tp->timeleft));
234	else {
235		while (offset < tp->timeleft)
236			++tp;
237		/*
238		 * Warn now, if going to sleep more than a fifth of
239		 * the next wait time.
240		 */
241		if ((sltime = offset - tp->timeleft)) {
242			if (sltime > tp->timetowait / 5)
243				timewarn(offset);
244			(void)sleep(sltime);
245		}
246	}
247	for (;; ++tp) {
248		timewarn(tp->timeleft);
249		if (!logged && tp->timeleft <= NOLOG_TIME) {
250			logged = 1;
251			nolog();
252		}
253		(void)sleep((u_int)tp->timetowait);
254		if (!tp->timeleft)
255			break;
256	}
257	die_you_gravy_sucking_pig_dog();
258}
259
260static jmp_buf alarmbuf;
261
262static char *restricted_environ[] = {
263	"PATH=" _PATH_STDPATH,
264	NULL
265};
266
267void
268timewarn(timeleft)
269	int timeleft;
270{
271	static int first;
272	static char hostname[MAXHOSTNAMELEN + 1];
273	FILE *pf;
274	char wcmd[MAXPATHLEN + 4];
275	extern char **environ;
276
277	if (!first++)
278		(void)gethostname(hostname, sizeof(hostname));
279
280	/* undoc -n option to wall suppresses normal wall banner */
281	(void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL);
282	environ = restricted_environ;
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 unnecessary, 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	char *empty_environ[] = { NULL };
330
331	syslog(LOG_NOTICE, "%s by %s: %s",
332	    doreboot ? "reboot" : dohalt ? "halt" : dopower ? "power-down" :
333	    "shutdown", whom, mbuf);
334	(void)sleep(2);
335
336	(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
337	if (killflg) {
338		(void)printf("\rbut you'll have to do it yourself\r\n");
339		exit(0);
340	}
341#ifdef DEBUG
342	if (doreboot)
343		(void)printf("reboot");
344	else if (dohalt)
345		(void)printf("halt");
346	else if (dopower)
347		(void)printf("power-down");
348	if (nosync)
349		(void)printf(" no sync");
350	(void)printf("\nkill -HUP 1\n");
351#else
352	if (doreboot) {
353		execle(_PATH_REBOOT, "reboot", "-l", nosync,
354			   (char *)NULL, empty_environ);
355		syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_REBOOT);
356		warn(_PATH_REBOOT);
357	}
358	else if (dohalt) {
359		execle(_PATH_HALT, "halt", "-l", nosync,
360			   (char *)NULL, empty_environ);
361		syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_HALT);
362		warn(_PATH_HALT);
363	}
364	else if (dopower) {
365		execle(_PATH_HALT, "halt", "-l", "-p", nosync,
366			   (char *)NULL, empty_environ);
367		syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_HALT);
368		warn(_PATH_HALT);
369	}
370	(void)kill(1, SIGTERM);		/* to single user */
371#endif
372	finish(0);
373}
374
375#define	ATOI2(p)	(p[0] - '0') * 10 + (p[1] - '0'); p += 2;
376
377void
378getoffset(timearg)
379	register char *timearg;
380{
381	register struct tm *lt;
382	register char *p;
383	time_t now;
384	int this_year;
385
386	if (!strcasecmp(timearg, "now")) {		/* now */
387		offset = 0;
388		return;
389	}
390
391	(void)time(&now);
392	if (*timearg == '+') {				/* +minutes */
393		if (!isdigit(*++timearg))
394			badtime();
395		offset = atoi(timearg) * 60;
396		shuttime = now + offset;
397		return;
398	}
399
400	/* handle hh:mm by getting rid of the colon */
401	for (p = timearg; *p; ++p)
402		if (!isascii(*p) || !isdigit(*p))
403			if (*p == ':' && strlen(p) == 3) {
404				p[0] = p[1];
405				p[1] = p[2];
406				p[2] = '\0';
407			}
408			else
409				badtime();
410
411	unsetenv("TZ");					/* OUR timezone */
412	lt = localtime(&now);				/* current time val */
413
414	switch(strlen(timearg)) {
415	case 10:
416		this_year = lt->tm_year;
417		lt->tm_year = ATOI2(timearg);
418		/*
419		 * check if the specified year is in the next century.
420		 * allow for one year of user error as many people will
421		 * enter n - 1 at the start of year n.
422		 */
423		if (lt->tm_year < (this_year % 100) - 1)
424			lt->tm_year += 100;
425		/* adjust for the year 2000 and beyond */
426		lt->tm_year += (this_year - (this_year % 100));
427		/* FALLTHROUGH */
428	case 8:
429		lt->tm_mon = ATOI2(timearg);
430		if (--lt->tm_mon < 0 || lt->tm_mon > 11)
431			badtime();
432		/* FALLTHROUGH */
433	case 6:
434		lt->tm_mday = ATOI2(timearg);
435		if (lt->tm_mday < 1 || lt->tm_mday > 31)
436			badtime();
437		/* FALLTHROUGH */
438	case 4:
439		lt->tm_hour = ATOI2(timearg);
440		if (lt->tm_hour < 0 || lt->tm_hour > 23)
441			badtime();
442		lt->tm_min = ATOI2(timearg);
443		if (lt->tm_min < 0 || lt->tm_min > 59)
444			badtime();
445		lt->tm_sec = 0;
446		if ((shuttime = mktime(lt)) == -1)
447			badtime();
448		if ((offset = shuttime - now) < 0)
449			errx(1, "that time is already past.");
450		break;
451	default:
452		badtime();
453	}
454}
455
456#define	NOMSG	"\n\nNO LOGINS: System going down at "
457void
458nolog()
459{
460	int logfd;
461	char *ct;
462
463	(void)unlink(_PATH_NOLOGIN);	/* in case linked to another file */
464	(void)signal(SIGINT, finish);
465	(void)signal(SIGHUP, finish);
466	(void)signal(SIGQUIT, finish);
467	(void)signal(SIGTERM, finish);
468	if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
469	    0664)) >= 0) {
470		(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
471		ct = ctime(&shuttime);
472		(void)write(logfd, ct + 11, 5);
473		(void)write(logfd, "\n\n", 2);
474		(void)write(logfd, mbuf, strlen(mbuf));
475		(void)close(logfd);
476	}
477}
478
479void
480finish(signo)
481	int signo;
482{
483	if (!killflg)
484		(void)unlink(_PATH_NOLOGIN);
485	exit(0);
486}
487
488void
489badtime()
490{
491	errx(1, "bad time format");
492}
493
494void
495usage()
496{
497	fprintf(stderr,
498	    "usage: shutdown [-] [-hknpr] time [warning-message ...]\n");
499	exit(1);
500}
501