shutdown.c revision 6443 
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 <tzfile.h>
58#include <unistd.h>
59
60#include "pathnames.h"
61
62#ifdef DEBUG
63#undef _PATH_NOLOGIN
64#define	_PATH_NOLOGIN	"./nologin"
65#endif
66
67#define	H		*60*60
68#define	M		*60
69#define	S		*1
70#define	NOLOG_TIME	5*60
71struct interval {
72	int timeleft, timetowait;
73} tlist[] = {
74	10 H,  5 H,	 5 H,  3 H,	 2 H,  1 H,	1 H, 30 M,
75	30 M, 10 M,	20 M, 10 M,	10 M,  5 M,	5 M,  3 M,
76	 2 M,  1 M,	 1 M, 30 S,	30 S, 30 S,
77	 0, 0,
78};
79#undef H
80#undef M
81#undef S
82
83static time_t offset, shuttime;
84static int dohalt, doreboot, killflg, mbuflen;
85static char *nosync, *whom, mbuf[BUFSIZ];
86
87void badtime __P((void));
88void die_you_gravy_sucking_pig_dog __P((void));
89void finish __P((int));
90void getoffset __P((char *));
91void loop __P((void));
92void nolog __P((void));
93void timeout __P((int));
94void timewarn __P((int));
95void usage __P((void));
96
97int
98main(argc, argv)
99	int argc;
100	char *argv[];
101{
102	extern int optind;
103	register char *p, *endp;
104	struct passwd *pw;
105	int arglen, ch, len, readstdin;
106
107#ifndef DEBUG
108	if (geteuid()) {
109		(void)fprintf(stderr, "shutdown: NOT super-user\n");
110		exit(1);
111	}
112#endif
113	nosync = NULL;
114	readstdin = 0;
115	while ((ch = getopt(argc, argv, "-hknr")) != EOF)
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 (nosync) {
143		(void)fprintf(stderr,
144		    "shutdown: incompatible switches -f and -n.\n");
145		usage();
146	}
147	if (doreboot && dohalt) {
148		(void)fprintf(stderr,
149		    "shutdown: incompatible switches -h and -r.\n");
150		usage();
151	}
152	getoffset(*argv++);
153
154	if (*argv) {
155		for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
156			arglen = strlen(*argv);
157			if ((len -= arglen) <= 2)
158				break;
159			if (p != mbuf)
160				*p++ = ' ';
161			bcopy(*argv, p, arglen);
162			p += arglen;
163		}
164		*p = '\n';
165		*++p = '\0';
166	}
167
168	if (readstdin) {
169		p = mbuf;
170		endp = mbuf + sizeof(mbuf) - 2;
171		for (;;) {
172			if (!fgets(p, endp - p + 1, stdin))
173				break;
174			for (; *p &&  p < endp; ++p);
175			if (p == endp) {
176				*p = '\n';
177				*++p = '\0';
178				break;
179			}
180		}
181	}
182	mbuflen = strlen(mbuf);
183
184	if (offset)
185		(void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
186	else
187		(void)printf("Shutdown NOW!\n");
188
189	if (!(whom = getlogin()))
190		whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
191
192#ifdef DEBUG
193	(void)putc('\n', stdout);
194#else
195	(void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
196	{
197		int forkpid;
198
199		forkpid = fork();
200		if (forkpid == -1) {
201			perror("shutdown: fork");
202			exit(1);
203		}
204		if (forkpid) {
205			(void)printf("shutdown: [pid %d]\n", forkpid);
206			exit(0);
207		}
208	}
209#endif
210	openlog("shutdown", LOG_CONS, LOG_AUTH);
211	loop();
212	/* NOTREACHED */
213}
214
215void
216loop()
217{
218	struct interval *tp;
219	u_int sltime;
220	int logged;
221
222	if (offset <= NOLOG_TIME) {
223		logged = 1;
224		nolog();
225	}
226	else
227		logged = 0;
228	tp = tlist;
229	if (tp->timeleft < offset)
230		(void)sleep((u_int)(offset - tp->timeleft));
231	else {
232		while (offset < tp->timeleft)
233			++tp;
234		/*
235		 * Warn now, if going to sleep more than a fifth of
236		 * the next wait time.
237		 */
238		if (sltime = offset - tp->timeleft) {
239			if (sltime > tp->timetowait / 5)
240				timewarn(offset);
241			(void)sleep(sltime);
242		}
243	}
244	for (;; ++tp) {
245		timewarn(tp->timeleft);
246		if (!logged && tp->timeleft <= NOLOG_TIME) {
247			logged = 1;
248			nolog();
249		}
250		(void)sleep((u_int)tp->timetowait);
251		if (!tp->timeleft)
252			break;
253	}
254	die_you_gravy_sucking_pig_dog();
255}
256
257static jmp_buf alarmbuf;
258
259void
260timewarn(timeleft)
261	int timeleft;
262{
263	static int first;
264	static char hostname[MAXHOSTNAMELEN + 1];
265	FILE *pf;
266	char wcmd[MAXPATHLEN + 4];
267
268	if (!first++)
269		(void)gethostname(hostname, sizeof(hostname));
270
271	/* undoc -n option to wall suppresses normal wall banner */
272	(void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL);
273	if (!(pf = popen(wcmd, "w"))) {
274		syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
275		return;
276	}
277
278	(void)fprintf(pf,
279	    "\007*** %sSystem shutdown message from %s@%s ***\007\n",
280	    timeleft ? "": "FINAL ", whom, hostname);
281
282	if (timeleft > 10*60)
283		(void)fprintf(pf, "System going down at %5.5s\n\n",
284		    ctime(&shuttime) + 11);
285	else if (timeleft > 59)
286		(void)fprintf(pf, "System going down in %d minute%s\n\n",
287		    timeleft / 60, (timeleft > 60) ? "s" : "");
288	else if (timeleft)
289		(void)fprintf(pf, "System going down in 30 seconds\n\n");
290	else
291		(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
292
293	if (mbuflen)
294		(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
295
296	/*
297	 * play some games, just in case wall doesn't come back
298	 * probably unecessary, given that wall is careful.
299	 */
300	if (!setjmp(alarmbuf)) {
301		(void)signal(SIGALRM, timeout);
302		(void)alarm((u_int)30);
303		(void)pclose(pf);
304		(void)alarm((u_int)0);
305		(void)signal(SIGALRM, SIG_DFL);
306	}
307}
308
309void
310timeout(signo)
311	int signo;
312{
313	longjmp(alarmbuf, 1);
314}
315
316void
317die_you_gravy_sucking_pig_dog()
318{
319
320	syslog(LOG_NOTICE, "%s by %s: %s",
321	    doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf);
322	(void)sleep(2);
323
324	(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
325	if (killflg) {
326		(void)printf("\rbut you'll have to do it yourself\r\n");
327		exit(0);
328	}
329#ifdef DEBUG
330	if (doreboot)
331		(void)printf("reboot");
332	else if (dohalt)
333		(void)printf("halt");
334	if (nosync)
335		(void)printf(" no sync");
336	(void)printf("\nkill -HUP 1\n");
337#else
338	if (doreboot) {
339		execle(_PATH_REBOOT, "reboot", "-l", nosync, 0);
340		syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_REBOOT);
341		perror("shutdown");
342	}
343	else if (dohalt) {
344		execle(_PATH_HALT, "halt", "-l", nosync, 0);
345		syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_HALT);
346		perror("shutdown");
347	}
348	(void)kill(1, SIGTERM);		/* to single user */
349#endif
350	finish(0);
351}
352
353#define	ATOI2(p)	(p[0] - '0') * 10 + (p[1] - '0'); p += 2;
354
355void
356getoffset(timearg)
357	register char *timearg;
358{
359	register struct tm *lt;
360	register char *p;
361	time_t now;
362
363	if (!strcasecmp(timearg, "now")) {		/* now */
364		offset = 0;
365		return;
366	}
367
368	(void)time(&now);
369	if (*timearg == '+') {				/* +minutes */
370		if (!isdigit(*++timearg))
371			badtime();
372		offset = atoi(timearg) * 60;
373		shuttime = now + offset;
374		return;
375	}
376
377	/* handle hh:mm by getting rid of the colon */
378	for (p = timearg; *p; ++p)
379		if (!isascii(*p) || !isdigit(*p))
380			if (*p == ':' && strlen(p) == 3) {
381				p[0] = p[1];
382				p[1] = p[2];
383				p[2] = '\0';
384			}
385			else
386				badtime();
387
388	unsetenv("TZ");					/* OUR timezone */
389	lt = localtime(&now);				/* current time val */
390
391	switch(strlen(timearg)) {
392	case 10:
393		lt->tm_year = ATOI2(timearg);
394		/* FALLTHROUGH */
395	case 8:
396		lt->tm_mon = ATOI2(timearg);
397		if (--lt->tm_mon < 0 || lt->tm_mon > 11)
398			badtime();
399		/* FALLTHROUGH */
400	case 6:
401		lt->tm_mday = ATOI2(timearg);
402		if (lt->tm_mday < 1 || lt->tm_mday > 31)
403			badtime();
404		/* FALLTHROUGH */
405	case 4:
406		lt->tm_hour = ATOI2(timearg);
407		if (lt->tm_hour < 0 || lt->tm_hour > 23)
408			badtime();
409		lt->tm_min = ATOI2(timearg);
410		if (lt->tm_min < 0 || lt->tm_min > 59)
411			badtime();
412		lt->tm_sec = 0;
413		if ((shuttime = mktime(lt)) == -1)
414			badtime();
415		if ((offset = shuttime - now) < 0) {
416			(void)fprintf(stderr,
417			    "shutdown: that time is already past.\n");
418			exit(1);
419		}
420		break;
421	default:
422		badtime();
423	}
424}
425
426#define	NOMSG	"\n\nNO LOGINS: System going down at "
427void
428nolog()
429{
430	int logfd;
431	char *ct;
432
433	(void)unlink(_PATH_NOLOGIN);	/* in case linked to another file */
434	(void)signal(SIGINT, finish);
435	(void)signal(SIGHUP, finish);
436	(void)signal(SIGQUIT, finish);
437	(void)signal(SIGTERM, finish);
438	if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
439	    0664)) >= 0) {
440		(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
441		ct = ctime(&shuttime);
442		(void)write(logfd, ct + 11, 5);
443		(void)write(logfd, "\n\n", 2);
444		(void)write(logfd, mbuf, strlen(mbuf));
445		(void)close(logfd);
446	}
447}
448
449void
450finish(signo)
451	int signo;
452{
453	(void)unlink(_PATH_NOLOGIN);
454	exit(0);
455}
456
457void
458badtime()
459{
460	(void)fprintf(stderr, "shutdown: bad time format.\n");
461	exit(1);
462}
463
464void
465usage()
466{
467	fprintf(stderr, "usage: shutdown [-hknr] shutdowntime [ message ]\n");
468	exit(1);
469}
470