shutdown.c revision 32329 
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 *	$Id: shutdown.c,v 1.9 1998/01/08 02:21:30 alex Exp $
34 */
35
36#ifndef lint
37static char copyright[] =
38"@(#) 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
43static char sccsid[] = "@(#)shutdown.c	8.2 (Berkeley) 2/16/94";
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 <fcntl.h>
53#include <pwd.h>
54#include <setjmp.h>
55#include <signal.h>
56#include <stdio.h>
57#include <stdlib.h>
58#include <string.h>
59#include <unistd.h>
60#include <err.h>
61
62#include "pathnames.h"
63
64#ifdef DEBUG
65#undef _PATH_NOLOGIN
66#define	_PATH_NOLOGIN	"./nologin"
67#endif
68
69#define	H		*60*60
70#define	M		*60
71#define	S		*1
72#define	NOLOG_TIME	5*60
73struct interval {
74	int timeleft, timetowait;
75} tlist[] = {
76	10 H,  5 H,	 5 H,  3 H,	 2 H,  1 H,	1 H, 30 M,
77	30 M, 10 M,	20 M, 10 M,	10 M,  5 M,	5 M,  3 M,
78	 2 M,  1 M,	 1 M, 30 S,	30 S, 30 S,
79	 0, 0,
80};
81#undef H
82#undef M
83#undef S
84
85static time_t offset, shuttime;
86static int dohalt, doreboot, killflg, mbuflen;
87static char *nosync, *whom, mbuf[BUFSIZ];
88
89void badtime __P((void));
90void die_you_gravy_sucking_pig_dog __P((void));
91void finish __P((int));
92void getoffset __P((char *));
93void loop __P((void));
94void nolog __P((void));
95void timeout __P((int));
96void timewarn __P((int));
97void usage __P((void));
98
99int
100main(argc, argv)
101	int argc;
102	char *argv[];
103{
104	extern int optind;
105	register char *p, *endp;
106	struct passwd *pw;
107	int arglen, ch, len, readstdin;
108
109#ifndef DEBUG
110	if (geteuid())
111		errx(1, "NOT super-user");
112#endif
113	nosync = NULL;
114	readstdin = 0;
115	while ((ch = getopt(argc, argv, "-hknr")) != -1)
116		switch (ch) {
117		case '-':
118			readstdin = 1;
119			break;
120		case 'h':
121			dohalt = 1;
122			break;
123		case 'k':
124			killflg = 1;
125			break;
126		case 'n':
127			nosync = "-n";
128			break;
129		case 'r':
130			doreboot = 1;
131			break;
132		case '?':
133		default:
134			usage();
135		}
136	argc -= optind;
137	argv += optind;
138
139	if (argc < 1)
140		usage();
141
142	if (doreboot && dohalt) {
143		warnx("incompatible switches -h and -r.");
144		usage();
145	}
146	getoffset(*argv++);
147
148	if (*argv) {
149		for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
150			arglen = strlen(*argv);
151			if ((len -= arglen) <= 2)
152				break;
153			if (p != mbuf)
154				*p++ = ' ';
155			bcopy(*argv, p, arglen);
156			p += arglen;
157		}
158		*p = '\n';
159		*++p = '\0';
160	}
161
162	if (readstdin) {
163		p = mbuf;
164		endp = mbuf + sizeof(mbuf) - 2;
165		for (;;) {
166			if (!fgets(p, endp - p + 1, stdin))
167				break;
168			for (; *p &&  p < endp; ++p);
169			if (p == endp) {
170				*p = '\n';
171				*++p = '\0';
172				break;
173			}
174		}
175	}
176	mbuflen = strlen(mbuf);
177
178	if (offset)
179		(void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
180	else
181		(void)printf("Shutdown NOW!\n");
182
183	if (!(whom = getlogin()))
184		whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
185
186#ifdef DEBUG
187	(void)putc('\n', stdout);
188#else
189	(void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
190	{
191		int forkpid;
192
193		forkpid = fork();
194		if (forkpid == -1)
195			err(1, "fork");
196		if (forkpid)
197			errx(0, "[pid %d]", forkpid);
198	}
199	setsid();
200#endif
201	openlog("shutdown", LOG_CONS, LOG_AUTH);
202	loop();
203	/* NOTREACHED */
204}
205
206void
207loop()
208{
209	struct interval *tp;
210	u_int sltime;
211	int logged;
212
213	if (offset <= NOLOG_TIME) {
214		logged = 1;
215		nolog();
216	}
217	else
218		logged = 0;
219	tp = tlist;
220	if (tp->timeleft < offset)
221		(void)sleep((u_int)(offset - tp->timeleft));
222	else {
223		while (offset < tp->timeleft)
224			++tp;
225		/*
226		 * Warn now, if going to sleep more than a fifth of
227		 * the next wait time.
228		 */
229		if (sltime = offset - tp->timeleft) {
230			if (sltime > tp->timetowait / 5)
231				timewarn(offset);
232			(void)sleep(sltime);
233		}
234	}
235	for (;; ++tp) {
236		timewarn(tp->timeleft);
237		if (!logged && tp->timeleft <= NOLOG_TIME) {
238			logged = 1;
239			nolog();
240		}
241		(void)sleep((u_int)tp->timetowait);
242		if (!tp->timeleft)
243			break;
244	}
245	die_you_gravy_sucking_pig_dog();
246}
247
248static jmp_buf alarmbuf;
249
250void
251timewarn(timeleft)
252	int timeleft;
253{
254	static int first;
255	static char hostname[MAXHOSTNAMELEN + 1];
256	FILE *pf;
257	char wcmd[MAXPATHLEN + 4];
258
259	if (!first++)
260		(void)gethostname(hostname, sizeof(hostname));
261
262	/* undoc -n option to wall suppresses normal wall banner */
263	(void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL);
264	if (!(pf = popen(wcmd, "w"))) {
265		syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
266		return;
267	}
268
269	(void)fprintf(pf,
270	    "\007*** %sSystem shutdown message from %s@%s ***\007\n",
271	    timeleft ? "": "FINAL ", whom, hostname);
272
273	if (timeleft > 10*60)
274		(void)fprintf(pf, "System going down at %5.5s\n\n",
275		    ctime(&shuttime) + 11);
276	else if (timeleft > 59)
277		(void)fprintf(pf, "System going down in %d minute%s\n\n",
278		    timeleft / 60, (timeleft > 60) ? "s" : "");
279	else if (timeleft)
280		(void)fprintf(pf, "System going down in 30 seconds\n\n");
281	else
282		(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
283
284	if (mbuflen)
285		(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
286
287	/*
288	 * play some games, just in case wall doesn't come back
289	 * probably unecessary, given that wall is careful.
290	 */
291	if (!setjmp(alarmbuf)) {
292		(void)signal(SIGALRM, timeout);
293		(void)alarm((u_int)30);
294		(void)pclose(pf);
295		(void)alarm((u_int)0);
296		(void)signal(SIGALRM, SIG_DFL);
297	}
298}
299
300void
301timeout(signo)
302	int signo;
303{
304	longjmp(alarmbuf, 1);
305}
306
307void
308die_you_gravy_sucking_pig_dog()
309{
310
311	syslog(LOG_NOTICE, "%s by %s: %s",
312	    doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf);
313	(void)sleep(2);
314
315	(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
316	if (killflg) {
317		(void)printf("\rbut you'll have to do it yourself\r\n");
318		exit(0);
319	}
320#ifdef DEBUG
321	if (doreboot)
322		(void)printf("reboot");
323	else if (dohalt)
324		(void)printf("halt");
325	if (nosync)
326		(void)printf(" no sync");
327	(void)printf("\nkill -HUP 1\n");
328#else
329	if (doreboot) {
330		execle(_PATH_REBOOT, "reboot", "-l", nosync, 0);
331		syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_REBOOT);
332		perror("shutdown");
333	}
334	else if (dohalt) {
335		execle(_PATH_HALT, "halt", "-l", nosync, 0);
336		syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_HALT);
337		perror("shutdown");
338	}
339	(void)kill(1, SIGTERM);		/* to single user */
340#endif
341	finish(0);
342}
343
344#define	ATOI2(p)	(p[0] - '0') * 10 + (p[1] - '0'); p += 2;
345
346void
347getoffset(timearg)
348	register char *timearg;
349{
350	register struct tm *lt;
351	register char *p;
352	time_t now;
353	int this_year;
354
355	if (!strcasecmp(timearg, "now")) {		/* now */
356		offset = 0;
357		return;
358	}
359
360	(void)time(&now);
361	if (*timearg == '+') {				/* +minutes */
362		if (!isdigit(*++timearg))
363			badtime();
364		offset = atoi(timearg) * 60;
365		shuttime = now + offset;
366		return;
367	}
368
369	/* handle hh:mm by getting rid of the colon */
370	for (p = timearg; *p; ++p)
371		if (!isascii(*p) || !isdigit(*p))
372			if (*p == ':' && strlen(p) == 3) {
373				p[0] = p[1];
374				p[1] = p[2];
375				p[2] = '\0';
376			}
377			else
378				badtime();
379
380	unsetenv("TZ");					/* OUR timezone */
381	lt = localtime(&now);				/* current time val */
382
383	switch(strlen(timearg)) {
384	case 10:
385		this_year = lt->tm_year;
386		lt->tm_year = ATOI2(timearg);
387		/*
388		 * check if the specified year is in the next century.
389		 * allow for one year of user error as many people will
390		 * enter n - 1 at the start of year n.
391		 */
392		if (lt->tm_year < (this_year % 100) - 1)
393			lt->tm_year += 100;
394		/* adjust for the year 2000 and beyond */
395		lt->tm_year += (this_year - (this_year % 100));
396		/* FALLTHROUGH */
397	case 8:
398		lt->tm_mon = ATOI2(timearg);
399		if (--lt->tm_mon < 0 || lt->tm_mon > 11)
400			badtime();
401		/* FALLTHROUGH */
402	case 6:
403		lt->tm_mday = ATOI2(timearg);
404		if (lt->tm_mday < 1 || lt->tm_mday > 31)
405			badtime();
406		/* FALLTHROUGH */
407	case 4:
408		lt->tm_hour = ATOI2(timearg);
409		if (lt->tm_hour < 0 || lt->tm_hour > 23)
410			badtime();
411		lt->tm_min = ATOI2(timearg);
412		if (lt->tm_min < 0 || lt->tm_min > 59)
413			badtime();
414		lt->tm_sec = 0;
415		if ((shuttime = mktime(lt)) == -1)
416			badtime();
417		if ((offset = shuttime - now) < 0)
418			errx(1, "that time is already past.");
419		break;
420	default:
421		badtime();
422	}
423}
424
425#define	NOMSG	"\n\nNO LOGINS: System going down at "
426void
427nolog()
428{
429	int logfd;
430	char *ct;
431
432	(void)unlink(_PATH_NOLOGIN);	/* in case linked to another file */
433	(void)signal(SIGINT, finish);
434	(void)signal(SIGHUP, finish);
435	(void)signal(SIGQUIT, finish);
436	(void)signal(SIGTERM, finish);
437	if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
438	    0664)) >= 0) {
439		(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
440		ct = ctime(&shuttime);
441		(void)write(logfd, ct + 11, 5);
442		(void)write(logfd, "\n\n", 2);
443		(void)write(logfd, mbuf, strlen(mbuf));
444		(void)close(logfd);
445	}
446}
447
448void
449finish(signo)
450	int signo;
451{
452	(void)unlink(_PATH_NOLOGIN);
453	exit(0);
454}
455
456void
457badtime()
458{
459	errx(1, "bad time format.");
460}
461
462void
463usage()
464{
465	fprintf(stderr, "usage: shutdown [-hknr] shutdowntime [ message ]\n");
466	exit(1);
467}
468