shutdown.c revision 9987 
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 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
41static char sccsid[] = "@(#)shutdown.c	8.2 (Berkeley) 2/16/94";
42#endif /* not lint */
43
44#include <sys/param.h>
45#include <sys/time.h>
46#include <sys/resource.h>
47#include <sys/syslog.h>
48
49#include <ctype.h>
50#include <fcntl.h>
51#include <pwd.h>
52#include <setjmp.h>
53#include <signal.h>
54#include <stdio.h>
55#include <stdlib.h>
56#include <string.h>
57#include <unistd.h>
58
59#include "pathnames.h"
60
61#ifdef DEBUG
62#undef _PATH_NOLOGIN
63#define	_PATH_NOLOGIN	"./nologin"
64#endif
65
66#define	H		*60*60
67#define	M		*60
68#define	S		*1
69#define	NOLOG_TIME	5*60
70struct interval {
71	int timeleft, timetowait;
72} tlist[] = {
73	10 H,  5 H,	 5 H,  3 H,	 2 H,  1 H,	1 H, 30 M,
74	30 M, 10 M,	20 M, 10 M,	10 M,  5 M,	5 M,  3 M,
75	 2 M,  1 M,	 1 M, 30 S,	30 S, 30 S,
76	 0, 0,
77};
78#undef H
79#undef M
80#undef S
81
82static time_t offset, shuttime;
83static int dohalt, doreboot, killflg, mbuflen;
84static char *nosync, *whom, mbuf[BUFSIZ];
85
86void badtime __P((void));
87void die_you_gravy_sucking_pig_dog __P((void));
88void finish __P((int));
89void getoffset __P((char *));
90void loop __P((void));
91void nolog __P((void));
92void timeout __P((int));
93void timewarn __P((int));
94void usage __P((void));
95
96int
97main(argc, argv)
98	int argc;
99	char *argv[];
100{
101	extern int optind;
102	register char *p, *endp;
103	struct passwd *pw;
104	int arglen, ch, len, readstdin;
105
106#ifndef DEBUG
107	if (geteuid()) {
108		(void)fprintf(stderr, "shutdown: NOT super-user\n");
109		exit(1);
110	}
111#endif
112	nosync = NULL;
113	readstdin = 0;
114	while ((ch = getopt(argc, argv, "-hknr")) != EOF)
115		switch (ch) {
116		case '-':
117			readstdin = 1;
118			break;
119		case 'h':
120			dohalt = 1;
121			break;
122		case 'k':
123			killflg = 1;
124			break;
125		case 'n':
126			nosync = "-n";
127			break;
128		case 'r':
129			doreboot = 1;
130			break;
131		case '?':
132		default:
133			usage();
134		}
135	argc -= optind;
136	argv += optind;
137
138	if (argc < 1)
139		usage();
140
141	if (nosync) {
142		(void)fprintf(stderr,
143		    "shutdown: incompatible switches -f and -n.\n");
144		usage();
145	}
146	if (doreboot && dohalt) {
147		(void)fprintf(stderr,
148		    "shutdown: incompatible switches -h and -r.\n");
149		usage();
150	}
151	getoffset(*argv++);
152
153	if (*argv) {
154		for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
155			arglen = strlen(*argv);
156			if ((len -= arglen) <= 2)
157				break;
158			if (p != mbuf)
159				*p++ = ' ';
160			bcopy(*argv, p, arglen);
161			p += arglen;
162		}
163		*p = '\n';
164		*++p = '\0';
165	}
166
167	if (readstdin) {
168		p = mbuf;
169		endp = mbuf + sizeof(mbuf) - 2;
170		for (;;) {
171			if (!fgets(p, endp - p + 1, stdin))
172				break;
173			for (; *p &&  p < endp; ++p);
174			if (p == endp) {
175				*p = '\n';
176				*++p = '\0';
177				break;
178			}
179		}
180	}
181	mbuflen = strlen(mbuf);
182
183	if (offset)
184		(void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
185	else
186		(void)printf("Shutdown NOW!\n");
187
188	if (!(whom = getlogin()))
189		whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
190
191#ifdef DEBUG
192	(void)putc('\n', stdout);
193#else
194	(void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
195	{
196		int forkpid;
197
198		forkpid = fork();
199		if (forkpid == -1) {
200			perror("shutdown: fork");
201			exit(1);
202		}
203		if (forkpid) {
204			(void)printf("shutdown: [pid %d]\n", forkpid);
205			exit(0);
206		}
207	}
208#endif
209	openlog("shutdown", LOG_CONS, LOG_AUTH);
210	loop();
211	/* NOTREACHED */
212}
213
214void
215loop()
216{
217	struct interval *tp;
218	u_int sltime;
219	int logged;
220
221	if (offset <= NOLOG_TIME) {
222		logged = 1;
223		nolog();
224	}
225	else
226		logged = 0;
227	tp = tlist;
228	if (tp->timeleft < offset)
229		(void)sleep((u_int)(offset - tp->timeleft));
230	else {
231		while (offset < tp->timeleft)
232			++tp;
233		/*
234		 * Warn now, if going to sleep more than a fifth of
235		 * the next wait time.
236		 */
237		if (sltime = offset - tp->timeleft) {
238			if (sltime > tp->timetowait / 5)
239				timewarn(offset);
240			(void)sleep(sltime);
241		}
242	}
243	for (;; ++tp) {
244		timewarn(tp->timeleft);
245		if (!logged && tp->timeleft <= NOLOG_TIME) {
246			logged = 1;
247			nolog();
248		}
249		(void)sleep((u_int)tp->timetowait);
250		if (!tp->timeleft)
251			break;
252	}
253	die_you_gravy_sucking_pig_dog();
254}
255
256static jmp_buf alarmbuf;
257
258void
259timewarn(timeleft)
260	int timeleft;
261{
262	static int first;
263	static char hostname[MAXHOSTNAMELEN + 1];
264	FILE *pf;
265	char wcmd[MAXPATHLEN + 4];
266
267	if (!first++)
268		(void)gethostname(hostname, sizeof(hostname));
269
270	/* undoc -n option to wall suppresses normal wall banner */
271	(void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL);
272	if (!(pf = popen(wcmd, "w"))) {
273		syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
274		return;
275	}
276
277	(void)fprintf(pf,
278	    "\007*** %sSystem shutdown message from %s@%s ***\007\n",
279	    timeleft ? "": "FINAL ", whom, hostname);
280
281	if (timeleft > 10*60)
282		(void)fprintf(pf, "System going down at %5.5s\n\n",
283		    ctime(&shuttime) + 11);
284	else if (timeleft > 59)
285		(void)fprintf(pf, "System going down in %d minute%s\n\n",
286		    timeleft / 60, (timeleft > 60) ? "s" : "");
287	else if (timeleft)
288		(void)fprintf(pf, "System going down in 30 seconds\n\n");
289	else
290		(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
291
292	if (mbuflen)
293		(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
294
295	/*
296	 * play some games, just in case wall doesn't come back
297	 * probably unecessary, given that wall is careful.
298	 */
299	if (!setjmp(alarmbuf)) {
300		(void)signal(SIGALRM, timeout);
301		(void)alarm((u_int)30);
302		(void)pclose(pf);
303		(void)alarm((u_int)0);
304		(void)signal(SIGALRM, SIG_DFL);
305	}
306}
307
308void
309timeout(signo)
310	int signo;
311{
312	longjmp(alarmbuf, 1);
313}
314
315void
316die_you_gravy_sucking_pig_dog()
317{
318
319	syslog(LOG_NOTICE, "%s by %s: %s",
320	    doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf);
321	(void)sleep(2);
322
323	(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
324	if (killflg) {
325		(void)printf("\rbut you'll have to do it yourself\r\n");
326		exit(0);
327	}
328#ifdef DEBUG
329	if (doreboot)
330		(void)printf("reboot");
331	else if (dohalt)
332		(void)printf("halt");
333	if (nosync)
334		(void)printf(" no sync");
335	(void)printf("\nkill -HUP 1\n");
336#else
337	if (doreboot) {
338		execle(_PATH_REBOOT, "reboot", "-l", nosync, 0);
339		syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_REBOOT);
340		perror("shutdown");
341	}
342	else if (dohalt) {
343		execle(_PATH_HALT, "halt", "-l", nosync, 0);
344		syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_HALT);
345		perror("shutdown");
346	}
347	(void)kill(1, SIGTERM);		/* to single user */
348#endif
349	finish(0);
350}
351
352#define	ATOI2(p)	(p[0] - '0') * 10 + (p[1] - '0'); p += 2;
353
354void
355getoffset(timearg)
356	register char *timearg;
357{
358	register struct tm *lt;
359	register char *p;
360	time_t now;
361
362	if (!strcasecmp(timearg, "now")) {		/* now */
363		offset = 0;
364		return;
365	}
366
367	(void)time(&now);
368	if (*timearg == '+') {				/* +minutes */
369		if (!isdigit(*++timearg))
370			badtime();
371		offset = atoi(timearg) * 60;
372		shuttime = now + offset;
373		return;
374	}
375
376	/* handle hh:mm by getting rid of the colon */
377	for (p = timearg; *p; ++p)
378		if (!isascii(*p) || !isdigit(*p))
379			if (*p == ':' && strlen(p) == 3) {
380				p[0] = p[1];
381				p[1] = p[2];
382				p[2] = '\0';
383			}
384			else
385				badtime();
386
387	unsetenv("TZ");					/* OUR timezone */
388	lt = localtime(&now);				/* current time val */
389
390	switch(strlen(timearg)) {
391	case 10:
392		lt->tm_year = ATOI2(timearg);
393		/* FALLTHROUGH */
394	case 8:
395		lt->tm_mon = ATOI2(timearg);
396		if (--lt->tm_mon < 0 || lt->tm_mon > 11)
397			badtime();
398		/* FALLTHROUGH */
399	case 6:
400		lt->tm_mday = ATOI2(timearg);
401		if (lt->tm_mday < 1 || lt->tm_mday > 31)
402			badtime();
403		/* FALLTHROUGH */
404	case 4:
405		lt->tm_hour = ATOI2(timearg);
406		if (lt->tm_hour < 0 || lt->tm_hour > 23)
407			badtime();
408		lt->tm_min = ATOI2(timearg);
409		if (lt->tm_min < 0 || lt->tm_min > 59)
410			badtime();
411		lt->tm_sec = 0;
412		if ((shuttime = mktime(lt)) == -1)
413			badtime();
414		if ((offset = shuttime - now) < 0) {
415			(void)fprintf(stderr,
416			    "shutdown: that time is already past.\n");
417			exit(1);
418		}
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	(void)fprintf(stderr, "shutdown: bad time format.\n");
460	exit(1);
461}
462
463void
464usage()
465{
466	fprintf(stderr, "usage: shutdown [-hknr] shutdowntime [ message ]\n");
467	exit(1);
468}
469