shutdown.c revision 1.5 
1/*
2 * Copyright (c) 1988, 1990 Regents of the University of California.
3 * 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
35char copyright[] =
36"@(#) Copyright (c) 1988 Regents of the University of California.\n\
37 All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41/*static char sccsid[] = "from: @(#)shutdown.c	5.16 (Berkeley) 2/3/91";*/
42static char rcsid[] = "$Id: shutdown.c,v 1.5 1994/02/16 02:56:04 cgd Exp $";
43#endif /* not lint */
44
45#include <sys/param.h>
46#include <sys/time.h>
47#include <sys/file.h>
48#include <sys/resource.h>
49#include <sys/syslog.h>
50#include <sys/signal.h>
51#include <setjmp.h>
52#include <tzfile.h>
53#include <pwd.h>
54#include <stdio.h>
55#include <ctype.h>
56#include "pathnames.h"
57
58#ifdef DEBUG
59#undef _PATH_NOLOGIN
60#define	_PATH_NOLOGIN	"./nologin"
61#undef _PATH_FASTBOOT
62#define	_PATH_FASTBOOT	"./fastboot"
63#endif
64
65#define	H		*60*60
66#define	M		*60
67#define	S		*1
68#define	NOLOG_TIME	5*60
69struct interval {
70	int timeleft, timetowait;
71} tlist[] = {
72	10 H,  5 H,	 5 H,  3 H,	 2 H,  1 H,	1 H, 30 M,
73	30 M, 10 M,	20 M, 10 M,	10 M,  5 M,	5 M,  3 M,
74	 2 M,  1 M,	 1 M, 30 S,	30 S, 30 S,
75	 0, 0,
76}, *tp = tlist;
77#undef H
78#undef M
79#undef S
80
81static time_t offset, shuttime;
82static int dofast, dohalt, doreboot, killflg, mbuflen;
83static char *nosync, *whom, mbuf[BUFSIZ];
84
85int warn __P((int));
86
87main(argc, argv)
88	int argc;
89	char **argv;
90{
91	extern int optind;
92	register char *p, *endp;
93	int arglen, ch, len, readstdin;
94	struct passwd *pw;
95	char *strcat(), *getlogin();
96	uid_t geteuid();
97
98#ifndef DEBUG
99	if (geteuid()) {
100		(void)fprintf(stderr, "shutdown: NOT super-user\n");
101		exit(1);
102	}
103#endif
104	nosync = NULL;
105	readstdin = 0;
106	while ((ch = getopt(argc, argv, "-fhknr")) != EOF)
107		switch (ch) {
108		case '-':
109			readstdin = 1;
110			break;
111		case 'f':
112			dofast = 1;
113			break;
114		case 'h':
115			dohalt = 1;
116			break;
117		case 'k':
118			killflg = 1;
119			break;
120		case 'n':
121			nosync = "-n";
122			break;
123		case 'r':
124			doreboot = 1;
125			break;
126		case '?':
127		default:
128			usage();
129		}
130	argc -= optind;
131	argv += optind;
132
133	if (argc < 1)
134		usage();
135
136	if (dofast && nosync) {
137		(void)fprintf(stderr,
138		    "shutdown: incompatible switches -f and -n.\n");
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
209loop()
210{
211	u_int sltime;
212	int logged;
213
214	if (offset <= NOLOG_TIME) {
215		logged = 1;
216		nolog();
217	}
218	else
219		logged = 0;
220	tp = tlist;
221	if (tp->timeleft < offset)
222		(void)sleep((u_int)(offset - tp->timeleft));
223	else {
224		while (offset < tp->timeleft)
225			++tp;
226		/*
227		 * warn now, if going to sleep more than a fifth of
228		 * the next wait time.
229		 */
230		if (sltime = offset - tp->timeleft) {
231			if (sltime > tp->timetowait / 5)
232				warn(offset);
233			(void)sleep(sltime);
234		}
235	}
236	for (;; ++tp) {
237		warn(tp->timeleft);
238		if (!logged && tp->timeleft <= NOLOG_TIME) {
239			logged = 1;
240			nolog();
241		}
242		(void)sleep((u_int)tp->timetowait);
243		if (!tp->timeleft)
244			break;
245	}
246	die_you_gravy_sucking_pig_dog();
247}
248
249static jmp_buf alarmbuf;
250
251warn(timeleft)
252	int timeleft;
253{
254	static int first;
255	static char hostname[MAXHOSTNAMELEN + 1];
256	char wcmd[MAXPATHLEN + 4];
257	FILE *pf;
258	char *ctime();
259	void timeout();
260
261	if (!first++)
262		(void)gethostname(hostname, sizeof(hostname));
263
264	/* undoc -n option to wall suppresses normal wall banner */
265	(void)sprintf(wcmd, "%s -n", _PATH_WALL);
266	if (!(pf = popen(wcmd, "w"))) {
267		syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
268		return;
269	}
270
271	(void)fprintf(pf,
272	    "\007*** %sSystem shutdown message from %s@%s ***\007\n",
273	    timeleft ? "": "FINAL ", whom, hostname);
274
275	if (timeleft > 10*60)
276		(void)fprintf(pf, "System going down at %5.5s\n\n",
277		    ctime(&shuttime) + 11);
278	else if (timeleft > 59)
279		(void)fprintf(pf, "System going down in %d minute%s\n\n",
280		    timeleft / 60, (timeleft > 60) ? "s" : "");
281	else if (timeleft)
282		(void)fprintf(pf, "System going down in 30 seconds\n\n");
283	else
284		(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
285
286	if (mbuflen)
287		(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
288
289	/*
290	 * play some games, just in case wall doesn't come back
291	 * probably unecessary, given that wall is careful.
292	 */
293	if (!setjmp(alarmbuf)) {
294		(void)signal(SIGALRM, timeout);
295		(void)alarm((u_int)30);
296		(void)pclose(pf);
297		(void)alarm((u_int)0);
298		(void)signal(SIGALRM, SIG_DFL);
299	}
300}
301
302void
303timeout()
304{
305	longjmp(alarmbuf, 1);
306}
307
308die_you_gravy_sucking_pig_dog()
309{
310	void finish();
311
312	syslog(LOG_NOTICE, "%s by %s: %s",
313	    doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf);
314	(void)sleep(2);
315
316	(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
317	if (killflg) {
318		(void)printf("\rbut you'll have to do it yourself\r\n");
319		finish();
320	}
321	if (dofast)
322		doitfast();
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	if (dofast)
331		(void)printf(" no fsck");
332	(void)printf("\nkill -HUP 1\n");
333#else
334	if (doreboot) {
335		execle(_PATH_REBOOT, "reboot", "-l", nosync, 0);
336		syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_REBOOT);
337		perror("shutdown");
338	}
339	else if (dohalt) {
340		execle(_PATH_HALT, "halt", "-l", nosync, 0);
341		syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_HALT);
342		perror("shutdown");
343	}
344	(void)kill(1, SIGTERM);		/* to single user */
345#endif
346	finish();
347}
348
349#define	ATOI2(p)	(p[0] - '0') * 10 + (p[1] - '0'); p += 2;
350
351getoffset(timearg)
352	register char *timearg;
353{
354	register struct tm *lt;
355	register char *p;
356	time_t now, time();
357
358	if (!strcasecmp(timearg, "now")) {		/* now */
359		offset = 0;
360		return;
361	}
362
363	(void)time(&now);
364	if (*timearg == '+') {				/* +minutes */
365		if (!isdigit(*++timearg))
366			badtime();
367		offset = atoi(timearg) * 60;
368		shuttime = now + offset;
369		return;
370	}
371
372	/* handle hh:mm by getting rid of the colon */
373	for (p = timearg; *p; ++p)
374		if (!isascii(*p) || !isdigit(*p))
375			if (*p == ':' && strlen(p) == 3) {
376				p[0] = p[1];
377				p[1] = p[2];
378				p[2] = '\0';
379			}
380			else
381				badtime();
382
383	unsetenv("TZ");					/* OUR timezone */
384	lt = localtime(&now);				/* current time val */
385
386	switch(strlen(timearg)) {
387	case 10:
388		lt->tm_year = ATOI2(timearg);
389		/* FALLTHROUGH */
390	case 8:
391		lt->tm_mon = ATOI2(timearg);
392		if (--lt->tm_mon < 0 || lt->tm_mon > 11)
393			badtime();
394		/* FALLTHROUGH */
395	case 6:
396		lt->tm_mday = ATOI2(timearg);
397		if (lt->tm_mday < 1 || lt->tm_mday > 31)
398			badtime();
399		/* FALLTHROUGH */
400	case 4:
401		lt->tm_hour = ATOI2(timearg);
402		if (lt->tm_hour < 0 || lt->tm_hour > 23)
403			badtime();
404		lt->tm_min = ATOI2(timearg);
405		if (lt->tm_min < 0 || lt->tm_min > 59)
406			badtime();
407		lt->tm_sec = 0;
408		if ((shuttime = mktime(lt)) == -1)
409			badtime();
410		if ((offset = shuttime - now) < 0) {
411			(void)fprintf(stderr,
412			    "shutdown: that time is already past.\n");
413			exit(1);
414		}
415		break;
416	default:
417		badtime();
418	}
419}
420
421#define	FSMSG	"fastboot file for fsck\n"
422doitfast()
423{
424	int fastfd;
425
426	if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC,
427	    0664)) >= 0) {
428		(void)write(fastfd, FSMSG, sizeof(FSMSG) - 1);
429		(void)close(fastfd);
430	}
431}
432
433#define	NOMSG	"\n\nNO LOGINS: System going down at "
434nolog()
435{
436	int logfd;
437	char *ct, *ctime();
438	void finish();
439
440	(void)unlink(_PATH_NOLOGIN);	/* in case linked to another file */
441	(void)signal(SIGINT, finish);
442	(void)signal(SIGHUP, finish);
443	(void)signal(SIGQUIT, finish);
444	(void)signal(SIGTERM, finish);
445	if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
446	    0664)) >= 0) {
447		(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
448		ct = ctime(&shuttime);
449		(void)write(logfd, ct + 11, 5);
450		(void)write(logfd, "\n\n", 2);
451		(void)write(logfd, mbuf, strlen(mbuf));
452		(void)close(logfd);
453	}
454}
455
456void
457finish()
458{
459	(void)unlink(_PATH_NOLOGIN);
460	exit(0);
461}
462
463badtime()
464{
465	(void)fprintf(stderr, "shutdown: bad time format.\n");
466	exit(1);
467}
468
469usage()
470{
471	fprintf(stderr, "usage: shutdown [-fhknr] shutdowntime [ message ]\n");
472	exit(1);
473}
474