NetBSD-5.0.2/sbin/shutdown/shutdown.c
/* $NetBSD: shutdown.c,v 1.51 2008/07/20 01:20:23 lukem Exp $ */
/*
* Copyright (c) 1988, 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1988, 1990, 1993\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)shutdown.c 8.4 (Berkeley) 4/28/95";
#else
__RCSID("$NetBSD: shutdown.c,v 1.51 2008/07/20 01:20:23 lukem Exp $");
#endif
#endif /* not lint */
#include <sys/param.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/syslog.h>
#include <ctype.h>
#include <err.h>
#include <fcntl.h>
#include <pwd.h>
#include <setjmp.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <tzfile.h>
#include <unistd.h>
#include <errno.h>
#include "pathnames.h"
#ifdef DEBUG
#undef _PATH_NOLOGIN
#define _PATH_NOLOGIN "./nologin"
#undef _PATH_FASTBOOT
#define _PATH_FASTBOOT "./fastboot"
#endif
#define H *60*60
#define M *60
#define S *1
#define NOLOG_TIME 5*60
static const struct interval {
time_t timeleft, timetowait;
} tlist[] = {
{ 10 H, 5 H }, { 5 H, 3 H }, { 2 H, 1 H }, { 1 H, 30 M },
{ 30 M, 10 M }, { 20 M, 10 M }, { 10 M, 5 M }, { 5 M, 3 M },
{ 2 M, 1 M }, { 1 M, 30 S }, { 30 S, 30 S },
{ 0, 0 }
};
#undef H
#undef M
#undef S
static time_t offset, shuttime;
static int dofast, dohalt, doreboot, killflg, nofork, nosync, dodump;
static size_t mbuflen;
static int dopowerdown;
static const char *whom;
static char mbuf[BUFSIZ];
static char *bootstr;
static void badtime(void) __dead;
static void die_you_gravy_sucking_pig_dog(void) __dead;
static void doitfast(void);
void dorcshutdown(void);
static void finish(int) __dead;
static void getoffset(char *);
static void loop(void);
static void nolog(void);
static void timeout(int);
static void timewarn(time_t);
static void usage(void) __dead;
int
main(int argc, char *argv[])
{
char *p, *endp;
struct passwd *pw;
size_t arglen, len;
int ch;
(void)setprogname(argv[0]);
#ifndef DEBUG
if (geteuid())
errx(1, "%s: Not super-user", strerror(EPERM));
#endif
while ((ch = getopt(argc, argv, "b:Ddfhknpr")) != -1)
switch (ch) {
case 'b':
bootstr = optarg;
break;
case 'd':
dodump = 1;
break;
case 'D':
nofork = 1;
break;
case 'f':
dofast = 1;
break;
case 'p':
dopowerdown = 1;
/* FALLTHROUGH */
case 'h':
dohalt = 1;
break;
case 'k':
killflg = 1;
break;
case 'n':
nosync = 1;
break;
case 'r':
doreboot = 1;
break;
case '?':
default:
usage();
}
argc -= optind;
argv += optind;
if (argc < 1)
usage();
if (dodump && !dohalt && !doreboot)
doreboot = 1;
if (dofast && nosync) {
warnx("Incompatible options -f and -n");
usage();
}
if (dohalt && doreboot) {
const char *which_flag = dopowerdown ? "p" : "h";
warnx("Incompatible options -%s and -r", which_flag);
usage();
}
getoffset(*argv++);
if (argv[0]) {
if (strcmp(argv[0], "-") || argv[1]) {
for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
arglen = strlen(*argv);
if ((len -= arglen) <= 2)
break;
if (p != mbuf)
*p++ = ' ';
(void)memmove(p, *argv, arglen);
p += arglen;
}
*p = '\n';
*++p = '\0';
} else {
p = mbuf;
endp = mbuf + sizeof(mbuf) - 2;
for (;;) {
if (!fgets(p, endp - p + 1, stdin))
break;
for (; *p && p < endp; ++p);
if (p == endp) {
*p = '\n';
*++p = '\0';
break;
}
}
}
}
mbuflen = strlen(mbuf);
if (offset)
(void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
else
(void)printf("Shutdown NOW!\n");
if (!(whom = getlogin()))
whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
#ifdef DEBUG
(void)putc('\n', stdout);
#else
(void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
if (nofork == 0) {
int forkpid;
forkpid = fork();
if (forkpid == -1) {
perror("shutdown: fork");
exit(1);
}
if (forkpid) {
(void)printf("shutdown: [pid %d]\n", forkpid);
exit(0);
}
(void)setsid();
}
#endif
openlog("shutdown", LOG_CONS, LOG_AUTH);
loop();
/* NOTREACHED */
#ifdef __GNUC__
return 1;
#endif
}
void
loop(void)
{
const struct interval *tp;
u_int sltime;
int logged;
if (offset <= NOLOG_TIME) {
logged = 1;
nolog();
}
else
logged = 0;
tp = tlist;
if (tp->timeleft < offset)
(void)sleep((u_int)(offset - tp->timeleft));
else {
while (offset < tp->timeleft)
++tp;
/*
* Warn now, if going to sleep more than a fifth of
* the next wait time.
*/
if ((sltime = offset - tp->timeleft) != 0) {
if (sltime > tp->timetowait / 5)
timewarn(offset);
(void)sleep(sltime);
}
}
for (;; ++tp) {
timewarn(tp->timeleft);
if (!logged && tp->timeleft <= NOLOG_TIME) {
logged = 1;
nolog();
}
(void)sleep((u_int)tp->timetowait);
if (!tp->timeleft)
break;
}
die_you_gravy_sucking_pig_dog();
}
static jmp_buf alarmbuf;
void
timewarn(time_t timeleft)
{
static int first;
static char hostname[MAXHOSTNAMELEN + 1];
FILE *pf;
char wcmd[MAXPATHLEN + 4];
if (!first++) {
(void)gethostname(hostname, sizeof(hostname));
hostname[sizeof(hostname) - 1] = '\0';
}
/* undoc -n option to wall suppresses normal wall banner */
(void)snprintf(wcmd, sizeof wcmd, "%s -n", _PATH_WALL);
if ((pf = popen(wcmd, "w")) == NULL) {
syslog(LOG_ERR, "%s: Can't find `%s' (%m)", getprogname(),
_PATH_WALL);
return;
}
(void)fprintf(pf,
"\007*** %sSystem shutdown message from %s@%s ***\007\n",
timeleft ? "": "FINAL ", whom, hostname);
if (timeleft > 10*60)
(void)fprintf(pf, "System going down at %5.5s\n\n",
ctime(&shuttime) + 11);
else if (timeleft > 59)
(void)fprintf(pf, "System going down in %ld minute%s\n\n",
(long)timeleft / 60, (timeleft > 60) ? "s" : "");
else if (timeleft)
(void)fprintf(pf, "System going down in 30 seconds\n\n");
else
(void)fprintf(pf, "System going down IMMEDIATELY\n\n");
if (mbuflen)
(void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
/*
* play some games, just in case wall doesn't come back
* probably unnecessary, given that wall is careful.
*/
if (!setjmp(alarmbuf)) {
(void)signal(SIGALRM, timeout);
(void)alarm((u_int)30);
(void)pclose(pf);
(void)alarm((u_int)0);
(void)signal(SIGALRM, SIG_DFL);
}
}
static void
/*ARGSUSED*/
timeout(int signo)
{
longjmp(alarmbuf, 1);
}
static void
die_you_gravy_sucking_pig_dog(void)
{
const char *what;
if (doreboot) {
what = "reboot";
} else if (dohalt && dopowerdown) {
what = "poweroff";
} else if (dohalt) {
what = "halt";
} else {
what = "shutdown";
}
syslog(LOG_NOTICE, "%s by %s: %s", what, whom, mbuf);
(void)sleep(2);
(void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
if (killflg) {
(void)printf("\rbut you'll have to do it yourself\r\n");
finish(0);
}
if (dofast)
doitfast();
dorcshutdown();
if (doreboot || dohalt) {
const char *args[16];
const char **arg, *path;
#ifndef DEBUG
int serrno;
#endif
arg = &args[0];
if (doreboot) {
path = _PATH_REBOOT;
*arg++ = "reboot";
} else {
path = _PATH_HALT;
*arg++ = "halt";
}
if (dodump)
*arg++ = "-d";
if (nosync)
*arg++ = "-n";
if (dopowerdown)
*arg++ = "-p";
*arg++ = "-l";
if (bootstr)
*arg++ = bootstr;
*arg++ = 0;
#ifndef DEBUG
(void)execve(path, __UNCONST(args), NULL);
serrno = errno;
syslog(LOG_ERR, "Can't exec `%s' (%m)", path);
errno = serrno;
warn("Can't exec `%s'", path);
#else
printf("%s", path);
for (arg = &args[0]; *arg; arg++)
printf(" %s", *arg);
printf("\n");
#endif
} else {
#ifndef DEBUG
(void)kill(1, SIGTERM); /* to single user */
#else
printf("kill 1\n");
#endif
}
finish(0);
}
#define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
void
getoffset(char *timearg)
{
struct tm *lt;
char *p;
time_t now;
int yearset;
(void)time(&now);
if (!strcasecmp(timearg, "now")) { /* now */
offset = 0;
shuttime = now;
return;
}
if (*timearg == '+') { /* +minutes */
if (!isdigit((unsigned char)*++timearg))
badtime();
offset = atoi(timearg) * 60;
shuttime = now + offset;
return;
}
/* handle hh:mm by getting rid of the colon */
for (p = timearg; *p; ++p)
if (!isascii(*p) || !isdigit((unsigned char)*p)) {
if (*p == ':' && strlen(p) == 3) {
p[0] = p[1];
p[1] = p[2];
p[2] = '\0';
}
else
badtime();
}
(void)unsetenv("TZ"); /* OUR timezone */
lt = localtime(&now); /* current time val */
lt->tm_sec = 0;
yearset = 0;
switch (strlen(timearg)) {
case 12:
lt->tm_year = ATOI2(timearg) * 100 - TM_YEAR_BASE;
yearset = 1;
/* FALLTHROUGH */
case 10:
if (yearset) {
lt->tm_year += ATOI2(timearg);
} else {
yearset = ATOI2(timearg);
if (yearset < 69)
lt->tm_year = yearset + 2000 - TM_YEAR_BASE;
else
lt->tm_year = yearset + 1900 - TM_YEAR_BASE;
}
/* FALLTHROUGH */
case 8:
lt->tm_mon = ATOI2(timearg);
--lt->tm_mon;
/* FALLTHROUGH */
case 6:
lt->tm_mday = ATOI2(timearg);
/* FALLTHROUGH */
case 4:
lt->tm_hour = ATOI2(timearg);
/* FALLTHROUGH */
case 2:
lt->tm_min = ATOI2(timearg);
break;
default:
badtime();
}
if ((shuttime = mktime(lt)) == -1)
badtime();
if ((offset = shuttime - now) < 0)
errx(1, "time is already past");
}
void
dorcshutdown(void)
{
(void)printf("\r\nAbout to run shutdown hooks...\r\n");
#ifndef DEBUG
(void)setuid(0);
(void)system(". " _PATH_RCSHUTDOWN);
#endif
(void)sleep(5); /* Give operator a chance to abort this. */
(void)printf("\r\nDone running shutdown hooks.\r\n");
}
#define FSMSG "fastboot file for fsck\n"
void
doitfast(void)
{
int fastfd;
if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC,
0664)) >= 0) {
(void)write(fastfd, FSMSG, sizeof(FSMSG) - 1);
(void)close(fastfd);
}
}
#define NOMSG "\n\nNO LOGINS: System going down at "
void
nolog(void)
{
int logfd;
char *ct;
(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);
if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
0664)) >= 0) {
(void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
ct = ctime(&shuttime);
(void)write(logfd, ct + 11, 5);
(void)write(logfd, "\n\n", 2);
(void)write(logfd, mbuf, strlen(mbuf));
(void)close(logfd);
}
}
static void
/*ARGSUSED*/
finish(int signo)
{
if (!killflg)
(void)unlink(_PATH_NOLOGIN);
exit(0);
}
static void
badtime(void)
{
warnx("illegal time format");
usage();
}
static void
usage(void)
{
(void)fprintf(stderr,
"Usage: %s [-Ddfhknpr] time [message ... | -]\n",
getprogname());
exit(1);
}