shutdown.c revision 1.4 
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 1.4 1993/08/01 18:24:03 mycroft 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
85main(argc, argv)
86	int argc;
87	char **argv;
88{
89	extern int optind;
90	register char *p, *endp;
91	int arglen, ch, len, readstdin;
92	struct passwd *pw;
93	char *strcat(), *getlogin();
94	uid_t geteuid();
95
96#ifndef DEBUG
97	if (geteuid()) {
98		(void)fprintf(stderr, "shutdown: NOT super-user\n");
99		exit(1);
100	}
101#endif
102	nosync = NULL;
103	readstdin = 0;
104	while ((ch = getopt(argc, argv, "-fhknr")) != EOF)
105		switch (ch) {
106		case '-':
107			readstdin = 1;
108			break;
109		case 'f':
110			dofast = 1;
111			break;
112		case 'h':
113			dohalt = 1;
114			break;
115		case 'k':
116			killflg = 1;
117			break;
118		case 'n':
119			nosync = "-n";
120			break;
121		case 'r':
122			doreboot = 1;
123			break;
124		case '?':
125		default:
126			usage();
127		}
128	argc -= optind;
129	argv += optind;
130
131	if (argc < 1)
132		usage();
133
134	if (dofast && nosync) {
135		(void)fprintf(stderr,
136		    "shutdown: incompatible switches -f and -n.\n");
137		usage();
138	}
139	if (doreboot && dohalt) {
140		(void)fprintf(stderr,
141		    "shutdown: incompatible switches -h and -r.\n");
142		usage();
143	}
144	getoffset(*argv++);
145
146	if (*argv) {
147		for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
148			arglen = strlen(*argv);
149			if ((len -= arglen) <= 2)
150				break;
151			if (p != mbuf)
152				*p++ = ' ';
153			bcopy(*argv, p, arglen);
154			p += arglen;
155		}
156		*p = '\n';
157		*++p = '\0';
158	}
159
160	if (readstdin) {
161		p = mbuf;
162		endp = mbuf + sizeof(mbuf) - 2;
163		for (;;) {
164			if (!fgets(p, endp - p + 1, stdin))
165				break;
166			for (; *p &&  p < endp; ++p);
167			if (p == endp) {
168				*p = '\n';
169				*++p = '\0';
170				break;
171			}
172		}
173	}
174	mbuflen = strlen(mbuf);
175
176	if (offset)
177		(void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
178	else
179		(void)printf("Shutdown NOW!\n");
180
181	if (!(whom = getlogin()))
182		whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
183
184#ifdef DEBUG
185	(void)putc('\n', stdout);
186#else
187	(void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
188	{
189		int forkpid;
190
191		forkpid = fork();
192		if (forkpid == -1) {
193			perror("shutdown: fork");
194			exit(1);
195		}
196		if (forkpid) {
197			(void)printf("shutdown: [pid %d]\n", forkpid);
198			exit(0);
199		}
200	}
201#endif
202	openlog("shutdown", LOG_CONS, LOG_AUTH);
203	loop();
204	/*NOTREACHED*/
205}
206
207loop()
208{
209	u_int sltime;
210	int logged;
211
212	if (offset <= NOLOG_TIME) {
213		logged = 1;
214		nolog();
215	}
216	else
217		logged = 0;
218	tp = tlist;
219	if (tp->timeleft < offset)
220		(void)sleep((u_int)(offset - tp->timeleft));
221	else {
222		while (offset < tp->timeleft)
223			++tp;
224		/*
225		 * warn now, if going to sleep more than a fifth of
226		 * the next wait time.
227		 */
228		if (sltime = offset - tp->timeleft) {
229			if (sltime > tp->timetowait / 5)
230				warn();
231			(void)sleep(sltime);
232		}
233	}
234	for (;; ++tp) {
235		warn();
236		if (!logged && tp->timeleft <= NOLOG_TIME) {
237			logged = 1;
238			nolog();
239		}
240		(void)sleep((u_int)tp->timetowait);
241		if (!tp->timeleft)
242			break;
243	}
244	die_you_gravy_sucking_pig_dog();
245}
246
247static jmp_buf alarmbuf;
248
249warn()
250{
251	static int first;
252	static char hostname[MAXHOSTNAMELEN + 1];
253	char wcmd[MAXPATHLEN + 4];
254	FILE *pf;
255	char *ctime();
256	void timeout();
257
258	if (!first++)
259		(void)gethostname(hostname, sizeof(hostname));
260
261	/* undoc -n option to wall suppresses normal wall banner */
262	(void)sprintf(wcmd, "%s -n", _PATH_WALL);
263	if (!(pf = popen(wcmd, "w"))) {
264		syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
265		return;
266	}
267
268	(void)fprintf(pf,
269	    "\007*** %sSystem shutdown message from %s@%s ***\007\n",
270	    tp->timeleft ? "": "FINAL ", whom, hostname);
271
272	if (tp->timeleft > 10*60)
273		(void)fprintf(pf, "System going down at %5.5s\n\n",
274		    ctime(&shuttime) + 11);
275	else if (tp->timeleft > 59)
276		(void)fprintf(pf, "System going down in %d minute%s\n\n",
277		    tp->timeleft / 60, (tp->timeleft > 60) ? "s" : "");
278	else if (tp->timeleft)
279		(void)fprintf(pf, "System going down in 30 seconds\n\n");
280	else
281		(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
282
283	if (mbuflen)
284		(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
285
286	/*
287	 * play some games, just in case wall doesn't come back
288	 * probably unecessary, given that wall is careful.
289	 */
290	if (!setjmp(alarmbuf)) {
291		(void)signal(SIGALRM, timeout);
292		(void)alarm((u_int)30);
293		(void)pclose(pf);
294		(void)alarm((u_int)0);
295		(void)signal(SIGALRM, SIG_DFL);
296	}
297}
298
299void
300timeout()
301{
302	longjmp(alarmbuf, 1);
303}
304
305die_you_gravy_sucking_pig_dog()
306{
307	void finish();
308
309	syslog(LOG_NOTICE, "%s by %s: %s",
310	    doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf);
311	(void)sleep(2);
312
313	(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
314	if (killflg) {
315		(void)printf("\rbut you'll have to do it yourself\r\n");
316		finish();
317	}
318	if (dofast)
319		doitfast();
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	if (dofast)
328		(void)printf(" no fsck");
329	(void)printf("\nkill -HUP 1\n");
330#else
331	if (doreboot) {
332		execle(_PATH_REBOOT, "reboot", "-l", nosync, 0);
333		syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_REBOOT);
334		perror("shutdown");
335	}
336	else if (dohalt) {
337		execle(_PATH_HALT, "halt", "-l", nosync, 0);
338		syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_HALT);
339		perror("shutdown");
340	}
341	(void)kill(1, SIGTERM);		/* to single user */
342#endif
343	finish();
344}
345
346#define	ATOI2(p)	(p[0] - '0') * 10 + (p[1] - '0'); p += 2;
347
348getoffset(timearg)
349	register char *timearg;
350{
351	register struct tm *lt;
352	register char *p;
353	time_t now, time();
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		lt->tm_year = ATOI2(timearg);
386		/* FALLTHROUGH */
387	case 8:
388		lt->tm_mon = ATOI2(timearg);
389		if (--lt->tm_mon < 0 || lt->tm_mon > 11)
390			badtime();
391		/* FALLTHROUGH */
392	case 6:
393		lt->tm_mday = ATOI2(timearg);
394		if (lt->tm_mday < 1 || lt->tm_mday > 31)
395			badtime();
396		/* FALLTHROUGH */
397	case 4:
398		lt->tm_hour = ATOI2(timearg);
399		if (lt->tm_hour < 0 || lt->tm_hour > 23)
400			badtime();
401		lt->tm_min = ATOI2(timearg);
402		if (lt->tm_min < 0 || lt->tm_min > 59)
403			badtime();
404		lt->tm_sec = 0;
405		if ((shuttime = mktime(lt)) == -1)
406			badtime();
407		if ((offset = shuttime - now) < 0) {
408			(void)fprintf(stderr,
409			    "shutdown: that time is already past.\n");
410			exit(1);
411		}
412		break;
413	default:
414		badtime();
415	}
416}
417
418#define	FSMSG	"fastboot file for fsck\n"
419doitfast()
420{
421	int fastfd;
422
423	if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC,
424	    0664)) >= 0) {
425		(void)write(fastfd, FSMSG, sizeof(FSMSG) - 1);
426		(void)close(fastfd);
427	}
428}
429
430#define	NOMSG	"\n\nNO LOGINS: System going down at "
431nolog()
432{
433	int logfd;
434	char *ct, *ctime();
435	void finish();
436
437	(void)unlink(_PATH_NOLOGIN);	/* in case linked to another file */
438	(void)signal(SIGINT, finish);
439	(void)signal(SIGHUP, finish);
440	(void)signal(SIGQUIT, finish);
441	(void)signal(SIGTERM, finish);
442	if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
443	    0664)) >= 0) {
444		(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
445		ct = ctime(&shuttime);
446		(void)write(logfd, ct + 11, 5);
447		(void)write(logfd, "\n\n", 2);
448		(void)write(logfd, mbuf, strlen(mbuf));
449		(void)close(logfd);
450	}
451}
452
453void
454finish()
455{
456	(void)unlink(_PATH_NOLOGIN);
457	exit(0);
458}
459
460badtime()
461{
462	(void)fprintf(stderr, "shutdown: bad time format.\n");
463	exit(1);
464}
465
466usage()
467{
468	fprintf(stderr, "usage: shutdown [-fhknr] shutdowntime [ message ]\n");
469	exit(1);
470}
471