645 lines
14 KiB
C
645 lines
14 KiB
C
/* $OpenBSD: shutdown.c,v 1.56 2024/04/28 16:43:42 florian Exp $ */
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/* $NetBSD: shutdown.c,v 1.9 1995/03/18 15:01:09 cgd Exp $ */
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/*
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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. 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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#include <sys/types.h>
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#include <sys/resource.h>
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#include <sys/syslog.h>
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#include <sys/wait.h>
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#include <ctype.h>
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#include <fcntl.h>
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#include <sys/termios.h>
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#include <pwd.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 <time.h>
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#include <unistd.h>
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#include <limits.h>
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#include <errno.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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#undef _PATH_FASTBOOT
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#define _PATH_FASTBOOT "./fastboot"
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#endif
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#define H *60*60LL
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#define M *60LL
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#define S *1LL
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#define TEN_HOURS (10*60*60)
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#define NOLOG_TIME (5*60)
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struct interval {
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time_t timeleft;
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time_t timetowait;
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} tlist[] = {
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{ 0, 0 },
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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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const int tlistlen = sizeof(tlist) / sizeof(tlist[0]);
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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 dofast, dohalt, doreboot, dopower, dodump, mbuflen, nosync;
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static volatile sig_atomic_t killflg, timed_out;
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static char *whom, mbuf[BUFSIZ];
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void badtime(void);
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void __dead die_you_gravy_sucking_pig_dog(void);
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void doitfast(void);
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void __dead finish(int);
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void getoffset(char *);
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void __dead loop(void);
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void nolog(time_t);
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void timeout(int);
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void timewarn(time_t);
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void usage(void);
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int
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main(int argc, char *argv[])
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{
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char when[64];
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char *p, *endp;
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struct passwd *pw;
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struct tm *lt;
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int arglen, ch, len, readstdin = 0;
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pid_t forkpid;
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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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while ((ch = getopt(argc, argv, "dfhknpr-")) != -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 'd':
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dodump = 1;
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break;
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case 'f':
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dofast = 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 = 1;
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break;
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case 'p':
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dopower = 1;
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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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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 (dofast && nosync) {
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warnx("incompatible switches -f and -n.");
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usage();
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}
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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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if (doreboot && dopower) {
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warnx("incompatible switches -p and -r.");
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usage();
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}
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if (unveil(_PATH_CONSOLE, "rw") == -1)
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err(1, "unveil %s", _PATH_CONSOLE);
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if (unveil(_PATH_RC, "r") == -1)
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err(1, "unveil %s", _PATH_RC);
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if (unveil(_PATH_WALL, "x") == -1)
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err(1, "unveil %s", _PATH_WALL);
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if (unveil(_PATH_FASTBOOT, "wc") == -1)
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err(1, "unveil %s", _PATH_FASTBOOT);
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if (unveil(_PATH_NOLOGIN, "wc") == -1)
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err(1, "unveil %s", _PATH_NOLOGIN);
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if (dohalt || dopower) {
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if (unveil(_PATH_HALT, "x") == -1)
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err(1, "unveil %s", _PATH_HALT);
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} else if (doreboot) {
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if (unveil(_PATH_REBOOT, "x") == -1)
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err(1, "unveil %s", _PATH_REBOOT);
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} else {
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if (unveil(_PATH_BSHELL, "x") == -1)
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err(1, "unveil %s", _PATH_BSHELL);
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}
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if (pledge("stdio rpath wpath cpath getpw tty id proc exec", NULL) == -1)
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err(1, "pledge");
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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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memcpy(p, *argv, 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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;
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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 > 0) {
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shuttime = time(NULL) + offset;
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lt = localtime(&shuttime);
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if (lt != NULL) {
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strftime(when, sizeof(when), "%a %b %e %T %Z %Y", lt);
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printf("Shutdown at %s.\n", when);
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} else
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printf("Shutdown soon.\n");
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} else
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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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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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(void)printf("shutdown: [pid %ld]\n", (long)forkpid);
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exit(0);
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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(void)
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{
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struct timespec timeout;
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int broadcast, i, logged;
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broadcast = 1;
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for (i = 0; i < tlistlen - 1; i++) {
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if (offset > tlist[i + 1].timeleft) {
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tlist[i].timeleft = offset;
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tlist[i].timetowait = offset - tlist[i + 1].timeleft;
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break;
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}
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}
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/*
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* Don't spam the users: skip our offset's warning broadcast if
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* there's a broadcast scheduled after ours and it's relatively
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* imminent.
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*/
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if (offset > TEN_HOURS ||
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(offset > 0 && tlist[i].timetowait < tlist[i+1].timetowait / 5))
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broadcast = 0;
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for (logged = 0; i < tlistlen; i++) {
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if (broadcast)
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timewarn(tlist[i].timeleft);
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broadcast = 1;
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if (!logged && tlist[i].timeleft <= NOLOG_TIME) {
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logged = 1;
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nolog(tlist[i].timeleft);
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}
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timeout.tv_sec = tlist[i].timetowait;
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timeout.tv_nsec = 0;
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nanosleep(&timeout, NULL);
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}
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die_you_gravy_sucking_pig_dog();
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}
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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(time_t timeleft)
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{
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static char hostname[HOST_NAME_MAX+1];
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char when[64];
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struct tm *lt;
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static int first;
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int fd[2];
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pid_t pid, wpid;
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if (!first++)
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(void)gethostname(hostname, sizeof(hostname));
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if (pipe(fd) == -1) {
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syslog(LOG_ERR, "pipe: %m");
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return;
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}
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switch (pid = fork()) {
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case -1:
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syslog(LOG_ERR, "fork: %m");
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close(fd[0]);
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close(fd[1]);
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return;
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case 0:
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if (dup2(fd[0], STDIN_FILENO) == -1) {
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syslog(LOG_ERR, "dup2: %m");
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_exit(1);
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}
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if (fd[0] != STDIN_FILENO)
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close(fd[0]);
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close(fd[1]);
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/* wall(1)'s undocumented '-n' flag suppresses its banner. */
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execle(_PATH_WALL, _PATH_WALL, "-n", (char *)NULL,
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restricted_environ);
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syslog(LOG_ERR, "%s: %m", _PATH_WALL);
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_exit(1);
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default:
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close(fd[0]);
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}
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dprintf(fd[1],
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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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shuttime = time(NULL) + timeleft;
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lt = localtime(&shuttime);
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if (lt != NULL) {
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strftime(when, sizeof(when), "%H:%M %Z", lt);
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dprintf(fd[1], "System going down at %s\n\n", when);
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} else
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dprintf(fd[1], "System going down in %lld minute%s\n\n",
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(long long)(timeleft / 60),
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(timeleft > 60) ? "s" : "");
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} else if (timeleft > 59) {
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dprintf(fd[1], "System going down in %lld minute%s\n\n",
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(long long)(timeleft / 60), (timeleft > 60) ? "s" : "");
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} else if (timeleft)
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dprintf(fd[1], "System going down in 30 seconds\n\n");
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else
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dprintf(fd[1], "System going down IMMEDIATELY\n\n");
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if (mbuflen)
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(void)write(fd[1], mbuf, mbuflen);
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close(fd[1]);
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/*
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* If we wait longer than 30 seconds for wall(1) to exit we'll
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* throw off our schedule.
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*/
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signal(SIGALRM, timeout);
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siginterrupt(SIGALRM, 1);
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alarm(30);
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while ((wpid = wait(NULL)) != pid && !timed_out)
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continue;
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alarm(0);
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signal(SIGALRM, SIG_DFL);
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if (timed_out) {
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syslog(LOG_NOTICE,
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"wall[%ld] is taking too long to exit; continuing",
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(long)pid);
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timed_out = 0;
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}
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}
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void
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timeout(int signo)
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{
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timed_out = 1;
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}
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void
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die_you_gravy_sucking_pig_dog(void)
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{
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syslog(LOG_NOTICE, "%s by %s: %s",
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doreboot ? "reboot" : dopower ? "power-down" : dohalt ? "halt" :
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"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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finish(0);
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}
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if (dofast)
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doitfast();
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if (pledge("stdio rpath wpath cpath tty id proc exec", NULL) == -1)
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err(1, "pledge");
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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 (dopower)
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(void)printf("power-down");
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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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if (dofast)
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(void)printf(" no fsck");
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if (dodump)
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(void)printf(" with dump");
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(void)printf("\nkill -HUP 1\n");
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#else
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if (dohalt || dopower || doreboot) {
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char *args[10];
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char **arg, *path;
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if (pledge("stdio exec", NULL) == -1)
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err(1, "pledge");
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arg = &args[0];
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if (doreboot) {
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path = _PATH_REBOOT;
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*arg++ = "reboot";
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} else {
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path = _PATH_HALT;
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*arg++ = "halt";
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}
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*arg++ = "-l";
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if (dopower)
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*arg++ = "-p";
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if (nosync)
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*arg++ = "-n";
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if (dodump)
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*arg++ = "-d";
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*arg++ = NULL;
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execve(path, args, NULL);
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syslog(LOG_ERR, "shutdown: can't exec %s: %m.", path);
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warn("%s", path);
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}
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if (access(_PATH_RC, R_OK) != -1) {
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pid_t pid;
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struct termios t;
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int fd;
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switch ((pid = fork())) {
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case -1:
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break;
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case 0:
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if (revoke(_PATH_CONSOLE) == -1)
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perror("revoke");
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if (setsid() == -1)
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perror("setsid");
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fd = open(_PATH_CONSOLE, O_RDWR);
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if (fd == -1)
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perror("open");
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dup2(fd, 0);
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dup2(fd, 1);
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dup2(fd, 2);
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if (fd > 2)
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close(fd);
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/* At a minimum... */
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tcgetattr(0, &t);
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t.c_oflag |= (ONLCR | OPOST);
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tcsetattr(0, TCSANOW, &t);
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execl(_PATH_BSHELL, "sh", _PATH_RC, "shutdown", (char *)NULL);
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_exit(1);
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default:
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waitpid(pid, NULL, 0);
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}
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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(char *timearg)
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{
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char when[64];
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const char *errstr;
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struct tm *lt;
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int this_year;
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time_t minutes, now;
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char *p;
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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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if (timearg[0] == '+') { /* +minutes */
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minutes = strtonum(timearg, 0, INT_MAX, &errstr);
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if (errstr)
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errx(1, "relative offset is %s: %s", errstr, timearg);
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offset = minutes * 60;
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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((unsigned char)*p) || !isdigit((unsigned char)*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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} else
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badtime();
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}
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}
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unsetenv("TZ"); /* OUR timezone */
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time(&now);
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lt = localtime(&now); /* current time val */
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|
|
if (lt == NULL)
|
|
badtime();
|
|
|
|
switch (strlen(timearg)) {
|
|
case 10:
|
|
this_year = lt->tm_year;
|
|
lt->tm_year = ATOI2(timearg);
|
|
/*
|
|
* check if the specified year is in the next century.
|
|
* allow for one year of user error as many people will
|
|
* enter n - 1 at the start of year n.
|
|
*/
|
|
if (lt->tm_year < (this_year % 100) - 1)
|
|
lt->tm_year += 100;
|
|
/* adjust for the year 2000 and beyond */
|
|
lt->tm_year += (this_year - (this_year % 100));
|
|
/* FALLTHROUGH */
|
|
case 8:
|
|
lt->tm_mon = ATOI2(timearg);
|
|
if (--lt->tm_mon < 0 || lt->tm_mon > 11)
|
|
badtime();
|
|
/* FALLTHROUGH */
|
|
case 6:
|
|
lt->tm_mday = ATOI2(timearg);
|
|
if (lt->tm_mday < 1 || lt->tm_mday > 31)
|
|
badtime();
|
|
/* FALLTHROUGH */
|
|
case 4:
|
|
lt->tm_hour = ATOI2(timearg);
|
|
if (lt->tm_hour < 0 || lt->tm_hour > 23)
|
|
badtime();
|
|
lt->tm_min = ATOI2(timearg);
|
|
if (lt->tm_min < 0 || lt->tm_min > 59)
|
|
badtime();
|
|
lt->tm_sec = 0;
|
|
if ((shuttime = mktime(lt)) == -1)
|
|
badtime();
|
|
if ((offset = shuttime - now) < 0) {
|
|
strftime(when, sizeof(when), "%a %b %e %T %Z %Y", lt);
|
|
errx(1, "time is already past: %s", when);
|
|
}
|
|
break;
|
|
default:
|
|
badtime();
|
|
}
|
|
}
|
|
|
|
void
|
|
doitfast(void)
|
|
{
|
|
int fastfd;
|
|
|
|
if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC,
|
|
0664)) >= 0) {
|
|
dprintf(fastfd, "fastboot file for fsck\n");
|
|
close(fastfd);
|
|
}
|
|
}
|
|
|
|
void
|
|
nolog(time_t timeleft)
|
|
{
|
|
char when[64];
|
|
struct tm *tm;
|
|
int logfd;
|
|
|
|
(void)unlink(_PATH_NOLOGIN); /* in case linked to another file */
|
|
(void)signal(SIGINT, finish);
|
|
(void)signal(SIGHUP, finish);
|
|
(void)signal(SIGQUIT, finish);
|
|
(void)signal(SIGTERM, finish);
|
|
shuttime = time(NULL) + timeleft;
|
|
tm = localtime(&shuttime);
|
|
if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
|
|
0664)) >= 0) {
|
|
if (tm) {
|
|
strftime(when, sizeof(when), "at %H:%M %Z", tm);
|
|
dprintf(logfd,
|
|
"\n\nNO LOGINS: System going down %s\n\n", when);
|
|
} else
|
|
dprintf(logfd,
|
|
"\n\nNO LOGINS: System going in %lld minute%s\n\n",
|
|
(long long)(timeleft / 60),
|
|
(timeleft > 60) ? "s" : "");
|
|
close(logfd);
|
|
}
|
|
}
|
|
|
|
void
|
|
finish(int signo)
|
|
{
|
|
if (!killflg)
|
|
(void)unlink(_PATH_NOLOGIN);
|
|
if (signo == 0)
|
|
exit(0);
|
|
else
|
|
_exit(0);
|
|
}
|
|
|
|
void
|
|
badtime(void)
|
|
{
|
|
errx(1, "bad time format.");
|
|
}
|
|
|
|
void
|
|
usage(void)
|
|
{
|
|
fprintf(stderr,
|
|
"usage: shutdown [-] [-dfhknpr] time [warning-message ...]\n");
|
|
exit(1);
|
|
}
|