f6faa785f2
rely on undocumented behavior.
The following fixes were obtained from OpenBSD:
o -Wall fixes to tlist array initialization and assignment used
as truth value.
o Use a restricted environment.
o Improved error message when shutdown fails to exec reboot or halt.
486 lines
11 KiB
C
486 lines
11 KiB
C
/*
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* Copyright (c) 1988, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: shutdown.c,v 1.11 1998/01/08 20:05:45 alex Exp $
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*/
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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1988, 1990, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)shutdown.c 8.2 (Berkeley) 2/16/94";
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/syslog.h>
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#include <ctype.h>
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#include <fcntl.h>
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#include <pwd.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <err.h>
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#include "pathnames.h"
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#ifdef DEBUG
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#undef _PATH_NOLOGIN
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#define _PATH_NOLOGIN "./nologin"
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#endif
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#define H *60*60
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#define M *60
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#define S *1
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#define NOLOG_TIME 5*60
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struct interval {
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int timeleft, timetowait;
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} tlist[] = {
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{ 10 H, 5 H },
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{ 5 H, 3 H },
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{ 2 H, 1 H },
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{ 1 H, 30 M },
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{ 30 M, 10 M },
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{ 20 M, 10 M },
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{ 10 M, 5 M },
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{ 5 M, 3 M },
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{ 2 M, 1 M },
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{ 1 M, 30 S },
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{ 30 S, 30 S },
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{ 0 , 0 }
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};
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#undef H
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#undef M
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#undef S
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static time_t offset, shuttime;
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static int dohalt, doreboot, killflg, mbuflen;
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static char *nosync, *whom, mbuf[BUFSIZ];
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void badtime __P((void));
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void die_you_gravy_sucking_pig_dog __P((void));
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void finish __P((int));
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void getoffset __P((char *));
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void loop __P((void));
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void nolog __P((void));
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void timeout __P((int));
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void timewarn __P((int));
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void usage __P((void));
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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extern int optind;
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register char *p, *endp;
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struct passwd *pw;
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int arglen, ch, len, readstdin;
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#ifndef DEBUG
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if (geteuid())
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errx(1, "NOT super-user");
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#endif
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nosync = NULL;
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readstdin = 0;
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while ((ch = getopt(argc, argv, "-hknr")) != -1)
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switch (ch) {
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case '-':
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readstdin = 1;
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break;
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case 'h':
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dohalt = 1;
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break;
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case 'k':
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killflg = 1;
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break;
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case 'n':
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nosync = "-n";
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break;
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case 'r':
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doreboot = 1;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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if (argc < 1)
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usage();
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if (doreboot && dohalt) {
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warnx("incompatible switches -h and -r.");
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usage();
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}
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getoffset(*argv++);
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if (*argv) {
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for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
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arglen = strlen(*argv);
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if ((len -= arglen) <= 2)
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break;
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if (p != mbuf)
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*p++ = ' ';
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bcopy(*argv, p, arglen);
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p += arglen;
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}
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*p = '\n';
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*++p = '\0';
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}
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if (readstdin) {
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p = mbuf;
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endp = mbuf + sizeof(mbuf) - 2;
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for (;;) {
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if (!fgets(p, endp - p + 1, stdin))
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break;
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for (; *p && p < endp; ++p);
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if (p == endp) {
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*p = '\n';
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*++p = '\0';
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break;
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}
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}
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}
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mbuflen = strlen(mbuf);
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if (offset)
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(void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
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else
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(void)printf("Shutdown NOW!\n");
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if (!(whom = getlogin()))
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whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
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#ifdef DEBUG
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(void)putc('\n', stdout);
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#else
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(void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
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{
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int forkpid;
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forkpid = fork();
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if (forkpid == -1)
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err(1, "fork");
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if (forkpid)
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errx(0, "[pid %d]", forkpid);
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}
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setsid();
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#endif
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openlog("shutdown", LOG_CONS, LOG_AUTH);
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loop();
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/* NOTREACHED */
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}
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void
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loop()
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{
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struct interval *tp;
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u_int sltime;
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int logged;
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if (offset <= NOLOG_TIME) {
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logged = 1;
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nolog();
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}
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else
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logged = 0;
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tp = tlist;
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if (tp->timeleft < offset)
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(void)sleep((u_int)(offset - tp->timeleft));
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else {
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while (offset < tp->timeleft)
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++tp;
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/*
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* Warn now, if going to sleep more than a fifth of
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* the next wait time.
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*/
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if ((sltime = offset - tp->timeleft)) {
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if (sltime > tp->timetowait / 5)
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timewarn(offset);
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(void)sleep(sltime);
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}
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}
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for (;; ++tp) {
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timewarn(tp->timeleft);
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if (!logged && tp->timeleft <= NOLOG_TIME) {
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logged = 1;
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nolog();
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}
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(void)sleep((u_int)tp->timetowait);
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if (!tp->timeleft)
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break;
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}
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die_you_gravy_sucking_pig_dog();
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}
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static jmp_buf alarmbuf;
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static char *restricted_environ[] = {
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"PATH=" _PATH_STDPATH,
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NULL
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};
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void
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timewarn(timeleft)
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int timeleft;
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{
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static int first;
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static char hostname[MAXHOSTNAMELEN + 1];
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FILE *pf;
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char wcmd[MAXPATHLEN + 4];
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extern char **environ;
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if (!first++)
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(void)gethostname(hostname, sizeof(hostname));
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/* undoc -n option to wall suppresses normal wall banner */
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(void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL);
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environ = restricted_environ;
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if (!(pf = popen(wcmd, "w"))) {
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syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
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return;
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}
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(void)fprintf(pf,
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"\007*** %sSystem shutdown message from %s@%s ***\007\n",
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timeleft ? "": "FINAL ", whom, hostname);
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if (timeleft > 10*60)
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(void)fprintf(pf, "System going down at %5.5s\n\n",
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ctime(&shuttime) + 11);
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else if (timeleft > 59)
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(void)fprintf(pf, "System going down in %d minute%s\n\n",
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timeleft / 60, (timeleft > 60) ? "s" : "");
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else if (timeleft)
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(void)fprintf(pf, "System going down in 30 seconds\n\n");
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else
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(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
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if (mbuflen)
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(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
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/*
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* play some games, just in case wall doesn't come back
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* probably unecessary, given that wall is careful.
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*/
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if (!setjmp(alarmbuf)) {
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(void)signal(SIGALRM, timeout);
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(void)alarm((u_int)30);
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(void)pclose(pf);
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(void)alarm((u_int)0);
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(void)signal(SIGALRM, SIG_DFL);
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}
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}
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void
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timeout(signo)
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int signo;
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{
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longjmp(alarmbuf, 1);
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}
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void
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die_you_gravy_sucking_pig_dog()
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{
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char *empty_environ[] = { NULL };
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syslog(LOG_NOTICE, "%s by %s: %s",
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doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf);
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(void)sleep(2);
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(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
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if (killflg) {
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(void)printf("\rbut you'll have to do it yourself\r\n");
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exit(0);
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}
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#ifdef DEBUG
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if (doreboot)
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(void)printf("reboot");
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else if (dohalt)
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(void)printf("halt");
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if (nosync)
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(void)printf(" no sync");
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(void)printf("\nkill -HUP 1\n");
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#else
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if (doreboot) {
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execle(_PATH_REBOOT, "reboot", "-l", nosync,
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(char *)NULL, empty_environ);
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syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_REBOOT);
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warn(_PATH_REBOOT);
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}
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else if (dohalt) {
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execle(_PATH_HALT, "halt", "-l", nosync,
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(char *)NULL, empty_environ);
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syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_HALT);
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warn(_PATH_HALT);
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}
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(void)kill(1, SIGTERM); /* to single user */
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#endif
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finish(0);
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}
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#define ATOI2(p) (p[0] - '0') * 10 + (p[1] - '0'); p += 2;
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void
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getoffset(timearg)
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register char *timearg;
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{
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register struct tm *lt;
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register char *p;
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time_t now;
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int this_year;
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if (!strcasecmp(timearg, "now")) { /* now */
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offset = 0;
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return;
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}
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(void)time(&now);
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if (*timearg == '+') { /* +minutes */
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if (!isdigit(*++timearg))
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badtime();
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offset = atoi(timearg) * 60;
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shuttime = now + offset;
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return;
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}
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/* handle hh:mm by getting rid of the colon */
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for (p = timearg; *p; ++p)
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if (!isascii(*p) || !isdigit(*p))
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if (*p == ':' && strlen(p) == 3) {
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p[0] = p[1];
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p[1] = p[2];
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p[2] = '\0';
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}
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else
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badtime();
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unsetenv("TZ"); /* OUR timezone */
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lt = localtime(&now); /* current time val */
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switch(strlen(timearg)) {
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case 10:
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this_year = lt->tm_year;
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lt->tm_year = ATOI2(timearg);
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/*
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* check if the specified year is in the next century.
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* allow for one year of user error as many people will
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* enter n - 1 at the start of year n.
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*/
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if (lt->tm_year < (this_year % 100) - 1)
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lt->tm_year += 100;
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/* adjust for the year 2000 and beyond */
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lt->tm_year += (this_year - (this_year % 100));
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/* FALLTHROUGH */
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case 8:
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lt->tm_mon = ATOI2(timearg);
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if (--lt->tm_mon < 0 || lt->tm_mon > 11)
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badtime();
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/* FALLTHROUGH */
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case 6:
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lt->tm_mday = ATOI2(timearg);
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if (lt->tm_mday < 1 || lt->tm_mday > 31)
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badtime();
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/* FALLTHROUGH */
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case 4:
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lt->tm_hour = ATOI2(timearg);
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if (lt->tm_hour < 0 || lt->tm_hour > 23)
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badtime();
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lt->tm_min = ATOI2(timearg);
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if (lt->tm_min < 0 || lt->tm_min > 59)
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badtime();
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lt->tm_sec = 0;
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if ((shuttime = mktime(lt)) == -1)
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badtime();
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if ((offset = shuttime - now) < 0)
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errx(1, "that time is already past.");
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break;
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default:
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badtime();
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}
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}
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#define NOMSG "\n\nNO LOGINS: System going down at "
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void
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nolog()
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{
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int logfd;
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char *ct;
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(void)unlink(_PATH_NOLOGIN); /* in case linked to another file */
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(void)signal(SIGINT, finish);
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(void)signal(SIGHUP, finish);
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(void)signal(SIGQUIT, finish);
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(void)signal(SIGTERM, finish);
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if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
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0664)) >= 0) {
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(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
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ct = ctime(&shuttime);
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(void)write(logfd, ct + 11, 5);
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(void)write(logfd, "\n\n", 2);
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(void)write(logfd, mbuf, strlen(mbuf));
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(void)close(logfd);
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}
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}
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void
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finish(signo)
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int signo;
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{
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(void)unlink(_PATH_NOLOGIN);
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exit(0);
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}
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void
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badtime()
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{
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errx(1, "bad time format.");
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}
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void
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usage()
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{
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fprintf(stderr, "usage: shutdown [-hknr] shutdowntime [ message ]\n");
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exit(1);
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}
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