shutdown.c revision 24359 
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")) != -1)
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 (doreboot && dohalt) {
142		(void)fprintf(stderr,
143		    "shutdown: incompatible switches -h and -r.\n");
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			perror("shutdown: fork");
196			exit(1);
197		}
198		if (forkpid) {
199			(void)printf("shutdown: [pid %d]\n", forkpid);
200			exit(0);
201		}
202	}
203#endif
204	openlog("shutdown", LOG_CONS, LOG_AUTH);
205	loop();
206	/* NOTREACHED */
207}
208
209void
210loop()
211{
212	struct interval *tp;
213	u_int sltime;
214	int logged;
215
216	if (offset <= NOLOG_TIME) {
217		logged = 1;
218		nolog();
219	}
220	else
221		logged = 0;
222	tp = tlist;
223	if (tp->timeleft < offset)
224		(void)sleep((u_int)(offset - tp->timeleft));
225	else {
226		while (offset < tp->timeleft)
227			++tp;
228		/*
229		 * Warn now, if going to sleep more than a fifth of
230		 * the next wait time.
231		 */
232		if (sltime = offset - tp->timeleft) {
233			if (sltime > tp->timetowait / 5)
234				timewarn(offset);
235			(void)sleep(sltime);
236		}
237	}
238	for (;; ++tp) {
239		timewarn(tp->timeleft);
240		if (!logged && tp->timeleft <= NOLOG_TIME) {
241			logged = 1;
242			nolog();
243		}
244		(void)sleep((u_int)tp->timetowait);
245		if (!tp->timeleft)
246			break;
247	}
248	die_you_gravy_sucking_pig_dog();
249}
250
251static jmp_buf alarmbuf;
252
253void
254timewarn(timeleft)
255	int timeleft;
256{
257	static int first;
258	static char hostname[MAXHOSTNAMELEN + 1];
259	FILE *pf;
260	char wcmd[MAXPATHLEN + 4];
261
262	if (!first++)
263		(void)gethostname(hostname, sizeof(hostname));
264
265	/* undoc -n option to wall suppresses normal wall banner */
266	(void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL);
267	if (!(pf = popen(wcmd, "w"))) {
268		syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
269		return;
270	}
271
272	(void)fprintf(pf,
273	    "\007*** %sSystem shutdown message from %s@%s ***\007\n",
274	    timeleft ? "": "FINAL ", whom, hostname);
275
276	if (timeleft > 10*60)
277		(void)fprintf(pf, "System going down at %5.5s\n\n",
278		    ctime(&shuttime) + 11);
279	else if (timeleft > 59)
280		(void)fprintf(pf, "System going down in %d minute%s\n\n",
281		    timeleft / 60, (timeleft > 60) ? "s" : "");
282	else if (timeleft)
283		(void)fprintf(pf, "System going down in 30 seconds\n\n");
284	else
285		(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
286
287	if (mbuflen)
288		(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
289
290	/*
291	 * play some games, just in case wall doesn't come back
292	 * probably unecessary, given that wall is careful.
293	 */
294	if (!setjmp(alarmbuf)) {
295		(void)signal(SIGALRM, timeout);
296		(void)alarm((u_int)30);
297		(void)pclose(pf);
298		(void)alarm((u_int)0);
299		(void)signal(SIGALRM, SIG_DFL);
300	}
301}
302
303void
304timeout(signo)
305	int signo;
306{
307	longjmp(alarmbuf, 1);
308}
309
310void
311die_you_gravy_sucking_pig_dog()
312{
313
314	syslog(LOG_NOTICE, "%s by %s: %s",
315	    doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf);
316	(void)sleep(2);
317
318	(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
319	if (killflg) {
320		(void)printf("\rbut you'll have to do it yourself\r\n");
321		exit(0);
322	}
323#ifdef DEBUG
324	if (doreboot)
325		(void)printf("reboot");
326	else if (dohalt)
327		(void)printf("halt");
328	if (nosync)
329		(void)printf(" no sync");
330	(void)printf("\nkill -HUP 1\n");
331#else
332	if (doreboot) {
333		execle(_PATH_REBOOT, "reboot", "-l", nosync, 0);
334		syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_REBOOT);
335		perror("shutdown");
336	}
337	else if (dohalt) {
338		execle(_PATH_HALT, "halt", "-l", nosync, 0);
339		syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_HALT);
340		perror("shutdown");
341	}
342	(void)kill(1, SIGTERM);		/* to single user */
343#endif
344	finish(0);
345}
346
347#define	ATOI2(p)	(p[0] - '0') * 10 + (p[1] - '0'); p += 2;
348
349void
350getoffset(timearg)
351	register char *timearg;
352{
353	register struct tm *lt;
354	register char *p;
355	time_t now;
356
357	if (!strcasecmp(timearg, "now")) {		/* now */
358		offset = 0;
359		return;
360	}
361
362	(void)time(&now);
363	if (*timearg == '+') {				/* +minutes */
364		if (!isdigit(*++timearg))
365			badtime();
366		offset = atoi(timearg) * 60;
367		shuttime = now + offset;
368		return;
369	}
370
371	/* handle hh:mm by getting rid of the colon */
372	for (p = timearg; *p; ++p)
373		if (!isascii(*p) || !isdigit(*p))
374			if (*p == ':' && strlen(p) == 3) {
375				p[0] = p[1];
376				p[1] = p[2];
377				p[2] = '\0';
378			}
379			else
380				badtime();
381
382	unsetenv("TZ");					/* OUR timezone */
383	lt = localtime(&now);				/* current time val */
384
385	switch(strlen(timearg)) {
386	case 10:
387		lt->tm_year = ATOI2(timearg);
388		/* FALLTHROUGH */
389	case 8:
390		lt->tm_mon = ATOI2(timearg);
391		if (--lt->tm_mon < 0 || lt->tm_mon > 11)
392			badtime();
393		/* FALLTHROUGH */
394	case 6:
395		lt->tm_mday = ATOI2(timearg);
396		if (lt->tm_mday < 1 || lt->tm_mday > 31)
397			badtime();
398		/* FALLTHROUGH */
399	case 4:
400		lt->tm_hour = ATOI2(timearg);
401		if (lt->tm_hour < 0 || lt->tm_hour > 23)
402			badtime();
403		lt->tm_min = ATOI2(timearg);
404		if (lt->tm_min < 0 || lt->tm_min > 59)
405			badtime();
406		lt->tm_sec = 0;
407		if ((shuttime = mktime(lt)) == -1)
408			badtime();
409		if ((offset = shuttime - now) < 0) {
410			(void)fprintf(stderr,
411			    "shutdown: that time is already past.\n");
412			exit(1);
413		}
414		break;
415	default:
416		badtime();
417	}
418}
419
420#define	NOMSG	"\n\nNO LOGINS: System going down at "
421void
422nolog()
423{
424	int logfd;
425	char *ct;
426
427	(void)unlink(_PATH_NOLOGIN);	/* in case linked to another file */
428	(void)signal(SIGINT, finish);
429	(void)signal(SIGHUP, finish);
430	(void)signal(SIGQUIT, finish);
431	(void)signal(SIGTERM, finish);
432	if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
433	    0664)) >= 0) {
434		(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
435		ct = ctime(&shuttime);
436		(void)write(logfd, ct + 11, 5);
437		(void)write(logfd, "\n\n", 2);
438		(void)write(logfd, mbuf, strlen(mbuf));
439		(void)close(logfd);
440	}
441}
442
443void
444finish(signo)
445	int signo;
446{
447	(void)unlink(_PATH_NOLOGIN);
448	exit(0);
449}
450
451void
452badtime()
453{
454	(void)fprintf(stderr, "shutdown: bad time format.\n");
455	exit(1);
456}
457
458void
459usage()
460{
461	fprintf(stderr, "usage: shutdown [-hknr] shutdowntime [ message ]\n");
462	exit(1);
463}
464