xref: /dragonfly/sbin/shutdown/shutdown.c (revision 984263bc) 
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
35 static const 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
41 #if 0
42 static char sccsid[] = "@(#)shutdown.c	8.4 (Berkeley) 4/28/95";
43 #endif
44 static const char rcsid[] =
45   "$FreeBSD: src/sbin/shutdown/shutdown.c,v 1.21.2.1 2001/07/30 10:38:08 dd Exp $";
46 #endif /* not lint */
47 
48 #include <sys/param.h>
49 #include <sys/time.h>
50 #include <sys/resource.h>
51 #include <sys/syslog.h>
52 
53 #include <ctype.h>
54 #include <err.h>
55 #include <fcntl.h>
56 #include <pwd.h>
57 #include <setjmp.h>
58 #include <signal.h>
59 #include <stdio.h>
60 #include <stdlib.h>
61 #include <string.h>
62 #include <unistd.h>
63 
64 #include "pathnames.h"
65 
66 #ifdef DEBUG
67 #undef _PATH_NOLOGIN
68 #define	_PATH_NOLOGIN	"./nologin"
69 #endif
70 
71 #define	H		*60*60
72 #define	M		*60
73 #define	S		*1
74 #define	NOLOG_TIME	5*60
75 struct interval {
76 	int timeleft, timetowait;
77 } tlist[] = {
78 	{ 10 H,  5 H },
79 	{  5 H,  3 H },
80 	{  2 H,  1 H },
81 	{  1 H, 30 M },
82 	{ 30 M, 10 M },
83 	{ 20 M, 10 M },
84 	{ 10 M,  5 M },
85 	{  5 M,  3 M },
86 	{  2 M,  1 M },
87 	{  1 M, 30 S },
88 	{ 30 S, 30 S },
89 	{  0  ,  0   }
90 };
91 #undef H
92 #undef M
93 #undef S
94 
95 static time_t offset, shuttime;
96 static int dohalt, dopower, doreboot, killflg, mbuflen, oflag;
97 static char mbuf[BUFSIZ];
98 static const char *nosync, *whom;
99 
100 void badtime __P((void));
101 void die_you_gravy_sucking_pig_dog __P((void));
102 void finish __P((int));
103 void getoffset __P((char *));
104 void loop __P((void));
105 void nolog __P((void));
106 void timeout __P((int));
107 void timewarn __P((int));
108 void usage __P((const char *));
109 
110 int
111 main(argc, argv)
112 	int argc;
113 	char *argv[];
114 {
115 	char *p, *endp;
116 	struct passwd *pw;
117 	int arglen, ch, len, readstdin;
118 
119 #ifndef DEBUG
120 	if (geteuid())
121 		errx(1, "NOT super-user");
122 #endif
123 	nosync = NULL;
124 	readstdin = 0;
125 	while ((ch = getopt(argc, argv, "-hknopr")) != -1)
126 		switch (ch) {
127 		case '-':
128 			readstdin = 1;
129 			break;
130 		case 'h':
131 			dohalt = 1;
132 			break;
133 		case 'k':
134 			killflg = 1;
135 			break;
136 		case 'n':
137 			nosync = "-n";
138 			break;
139 		case 'o':
140 			oflag = 1;
141 			break;
142 		case 'p':
143 			dopower = 1;
144 			break;
145 		case 'r':
146 			doreboot = 1;
147 			break;
148 		case '?':
149 		default:
150 			usage((char *)NULL);
151 		}
152 	argc -= optind;
153 	argv += optind;
154 
155 	if (argc < 1)
156 		usage((char *)NULL);
157 
158 	if (killflg + doreboot + dohalt + dopower > 1)
159 		usage("incompatible switches -h, -k, -p and -r");
160 
161 	if (oflag && !(dohalt || dopower || doreboot))
162 		usage("-o requires -h, -p or -r");
163 
164 	if (nosync != NULL && !oflag)
165 		usage("-n requires -o");
166 
167 	getoffset(*argv++);
168 
169 	if (*argv) {
170 		for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
171 			arglen = strlen(*argv);
172 			if ((len -= arglen) <= 2)
173 				break;
174 			if (p != mbuf)
175 				*p++ = ' ';
176 			memmove(p, *argv, arglen);
177 			p += arglen;
178 		}
179 		*p = '\n';
180 		*++p = '\0';
181 	}
182 
183 	if (readstdin) {
184 		p = mbuf;
185 		endp = mbuf + sizeof(mbuf) - 2;
186 		for (;;) {
187 			if (!fgets(p, endp - p + 1, stdin))
188 				break;
189 			for (; *p &&  p < endp; ++p);
190 			if (p == endp) {
191 				*p = '\n';
192 				*++p = '\0';
193 				break;
194 			}
195 		}
196 	}
197 	mbuflen = strlen(mbuf);
198 
199 	if (offset)
200 		(void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
201 	else
202 		(void)printf("Shutdown NOW!\n");
203 
204 	if (!(whom = getlogin()))
205 		whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
206 
207 #ifdef DEBUG
208 	(void)putc('\n', stdout);
209 #else
210 	(void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
211 	{
212 		int forkpid;
213 
214 		forkpid = fork();
215 		if (forkpid == -1)
216 			err(1, "fork");
217 		if (forkpid)
218 			errx(0, "[pid %d]", forkpid);
219 	}
220 	setsid();
221 #endif
222 	openlog("shutdown", LOG_CONS, LOG_AUTH);
223 	loop();
224 	return(0);
225 }
226 
227 void
228 loop()
229 {
230 	struct interval *tp;
231 	u_int sltime;
232 	int logged;
233 
234 	if (offset <= NOLOG_TIME) {
235 		logged = 1;
236 		nolog();
237 	}
238 	else
239 		logged = 0;
240 	tp = tlist;
241 	if (tp->timeleft < offset)
242 		(void)sleep((u_int)(offset - tp->timeleft));
243 	else {
244 		while (tp->timeleft && offset < tp->timeleft)
245 			++tp;
246 		/*
247 		 * Warn now, if going to sleep more than a fifth of
248 		 * the next wait time.
249 		 */
250 		if ((sltime = offset - tp->timeleft)) {
251 			if (sltime > (u_int)(tp->timetowait / 5))
252 				timewarn(offset);
253 			(void)sleep(sltime);
254 		}
255 	}
256 	for (;; ++tp) {
257 		timewarn(tp->timeleft);
258 		if (!logged && tp->timeleft <= NOLOG_TIME) {
259 			logged = 1;
260 			nolog();
261 		}
262 		(void)sleep((u_int)tp->timetowait);
263 		if (!tp->timeleft)
264 			break;
265 	}
266 	die_you_gravy_sucking_pig_dog();
267 }
268 
269 static jmp_buf alarmbuf;
270 
271 static const char *restricted_environ[] = {
272 	"PATH=" _PATH_STDPATH,
273 	NULL
274 };
275 
276 void
277 timewarn(timeleft)
278 	int timeleft;
279 {
280 	static int first;
281 	static char hostname[MAXHOSTNAMELEN + 1];
282 	FILE *pf;
283 	char wcmd[MAXPATHLEN + 4];
284 	extern const char **environ;
285 
286 	if (!first++)
287 		(void)gethostname(hostname, sizeof(hostname));
288 
289 	/* undoc -n option to wall suppresses normal wall banner */
290 	(void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL);
291 	environ = restricted_environ;
292 	if (!(pf = popen(wcmd, "w"))) {
293 		syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
294 		return;
295 	}
296 
297 	(void)fprintf(pf,
298 	    "\007*** %sSystem shutdown message from %s@%s ***\007\n",
299 	    timeleft ? "": "FINAL ", whom, hostname);
300 
301 	if (timeleft > 10*60)
302 		(void)fprintf(pf, "System going down at %5.5s\n\n",
303 		    ctime(&shuttime) + 11);
304 	else if (timeleft > 59)
305 		(void)fprintf(pf, "System going down in %d minute%s\n\n",
306 		    timeleft / 60, (timeleft > 60) ? "s" : "");
307 	else if (timeleft)
308 		(void)fprintf(pf, "System going down in 30 seconds\n\n");
309 	else
310 		(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
311 
312 	if (mbuflen)
313 		(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
314 
315 	/*
316 	 * play some games, just in case wall doesn't come back
317 	 * probably unnecessary, given that wall is careful.
318 	 */
319 	if (!setjmp(alarmbuf)) {
320 		(void)signal(SIGALRM, timeout);
321 		(void)alarm((u_int)30);
322 		(void)pclose(pf);
323 		(void)alarm((u_int)0);
324 		(void)signal(SIGALRM, SIG_DFL);
325 	}
326 }
327 
328 void
329 timeout(signo)
330 	int signo __unused;
331 {
332 	longjmp(alarmbuf, 1);
333 }
334 
335 void
336 die_you_gravy_sucking_pig_dog()
337 {
338 	char *empty_environ[] = { NULL };
339 
340 	syslog(LOG_NOTICE, "%s by %s: %s",
341 	    doreboot ? "reboot" : dohalt ? "halt" : dopower ? "power-down" :
342 	    "shutdown", whom, mbuf);
343 	(void)sleep(2);
344 
345 	(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
346 	if (killflg) {
347 		(void)printf("\rbut you'll have to do it yourself\r\n");
348 		exit(0);
349 	}
350 #ifdef DEBUG
351 	if (doreboot)
352 		(void)printf("reboot");
353 	else if (dohalt)
354 		(void)printf("halt");
355 	else if (dopower)
356 		(void)printf("power-down");
357 	if (nosync != NULL)
358 		(void)printf(" no sync");
359 	(void)printf("\nkill -HUP 1\n");
360 #else
361 	if (!oflag) {
362 		(void)kill(1, doreboot ? SIGINT :	/* reboot */
363 			      dohalt ? SIGUSR1 :	/* halt */
364 			      dopower ? SIGUSR2 :	/* power-down */
365 			      SIGTERM);			/* single-user */
366 	} else {
367 		if (doreboot) {
368 			execle(_PATH_REBOOT, "reboot", "-l", nosync,
369 				(char *)NULL, empty_environ);
370 			syslog(LOG_ERR, "shutdown: can't exec %s: %m.",
371 				_PATH_REBOOT);
372 			warn(_PATH_REBOOT);
373 		}
374 		else if (dohalt) {
375 			execle(_PATH_HALT, "halt", "-l", nosync,
376 				(char *)NULL, empty_environ);
377 			syslog(LOG_ERR, "shutdown: can't exec %s: %m.",
378 				_PATH_HALT);
379 			warn(_PATH_HALT);
380 		}
381 		else if (dopower) {
382 			execle(_PATH_HALT, "halt", "-l", "-p", nosync,
383 				(char *)NULL, empty_environ);
384 			syslog(LOG_ERR, "shutdown: can't exec %s: %m.",
385 				_PATH_HALT);
386 			warn(_PATH_HALT);
387 		}
388 		(void)kill(1, SIGTERM);		/* to single-user */
389 	}
390 #endif
391 	finish(0);
392 }
393 
394 #define	ATOI2(p)	(p[0] - '0') * 10 + (p[1] - '0'); p += 2;
395 
396 void
397 getoffset(timearg)
398 	char *timearg;
399 {
400 	struct tm *lt;
401 	char *p;
402 	time_t now;
403 	int this_year;
404 
405 	(void)time(&now);
406 
407 	if (!strcasecmp(timearg, "now")) {		/* now */
408 		offset = 0;
409 		shuttime = now;
410 		return;
411 	}
412 
413 	if (*timearg == '+') {				/* +minutes */
414 		if (!isdigit(*++timearg))
415 			badtime();
416 		if ((offset = atoi(timearg) * 60) < 0)
417 			badtime();
418 		shuttime = now + offset;
419 		return;
420 	}
421 
422 	/* handle hh:mm by getting rid of the colon */
423 	for (p = timearg; *p; ++p)
424 		if (!isascii(*p) || !isdigit(*p)) {
425 			if (*p == ':' && strlen(p) == 3) {
426 				p[0] = p[1];
427 				p[1] = p[2];
428 				p[2] = '\0';
429 			}
430 			else
431 				badtime();
432 		}
433 
434 	unsetenv("TZ");					/* OUR timezone */
435 	lt = localtime(&now);				/* current time val */
436 
437 	switch(strlen(timearg)) {
438 	case 10:
439 		this_year = lt->tm_year;
440 		lt->tm_year = ATOI2(timearg);
441 		/*
442 		 * check if the specified year is in the next century.
443 		 * allow for one year of user error as many people will
444 		 * enter n - 1 at the start of year n.
445 		 */
446 		if (lt->tm_year < (this_year % 100) - 1)
447 			lt->tm_year += 100;
448 		/* adjust for the year 2000 and beyond */
449 		lt->tm_year += (this_year - (this_year % 100));
450 		/* FALLTHROUGH */
451 	case 8:
452 		lt->tm_mon = ATOI2(timearg);
453 		if (--lt->tm_mon < 0 || lt->tm_mon > 11)
454 			badtime();
455 		/* FALLTHROUGH */
456 	case 6:
457 		lt->tm_mday = ATOI2(timearg);
458 		if (lt->tm_mday < 1 || lt->tm_mday > 31)
459 			badtime();
460 		/* FALLTHROUGH */
461 	case 4:
462 		lt->tm_hour = ATOI2(timearg);
463 		if (lt->tm_hour < 0 || lt->tm_hour > 23)
464 			badtime();
465 		lt->tm_min = ATOI2(timearg);
466 		if (lt->tm_min < 0 || lt->tm_min > 59)
467 			badtime();
468 		lt->tm_sec = 0;
469 		if ((shuttime = mktime(lt)) == -1)
470 			badtime();
471 		if ((offset = shuttime - now) < 0)
472 			errx(1, "that time is already past.");
473 		break;
474 	default:
475 		badtime();
476 	}
477 }
478 
479 #define	NOMSG	"\n\nNO LOGINS: System going down at "
480 void
481 nolog()
482 {
483 	int logfd;
484 	char *ct;
485 
486 	(void)unlink(_PATH_NOLOGIN);	/* in case linked to another file */
487 	(void)signal(SIGINT, finish);
488 	(void)signal(SIGHUP, finish);
489 	(void)signal(SIGQUIT, finish);
490 	(void)signal(SIGTERM, finish);
491 	if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
492 	    0664)) >= 0) {
493 		(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
494 		ct = ctime(&shuttime);
495 		(void)write(logfd, ct + 11, 5);
496 		(void)write(logfd, "\n\n", 2);
497 		(void)write(logfd, mbuf, strlen(mbuf));
498 		(void)close(logfd);
499 	}
500 }
501 
502 void
503 finish(signo)
504 	int signo __unused;
505 {
506 	if (!killflg)
507 		(void)unlink(_PATH_NOLOGIN);
508 	exit(0);
509 }
510 
511 void
512 badtime()
513 {
514 	errx(1, "bad time format");
515 }
516 
517 void
518 usage(cp)
519 	const char *cp;
520 {
521 	if (cp != NULL)
522 		warnx("%s", cp);
523 	(void)fprintf(stderr,
524 	    "usage: shutdown [-] [-h | -p | -r | -k] [-o [-n]]"
525 	    " time [warning-message ...]\n");
526 	exit(1);
527 }
528