sbin/shutdown/shutdown.c

   1 /*      $NetBSD: shutdown.c,v 1.50 2008/02/09 04:09:22 dholland Exp $   */
   2
   3 /*
   4  * Copyright (c) 1988, 1990, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 __COPYRIGHT("@(#) Copyright (c) 1988, 1990, 1993\
  35  The Regents of the University of California.  All rights reserved.");
  36 #endif /* not lint */
  37
  38 #ifndef lint
  39 #if 0
  40 static char sccsid[] = "@(#)shutdown.c  8.4 (Berkeley) 4/28/95";
  41 #else
  42 __RCSID("$NetBSD: shutdown.c,v 1.50 2008/02/09 04:09:22 dholland Exp $");
  43 #endif
  44 #endif /* not lint */
  45
  46 #include <sys/param.h>
  47 #include <sys/time.h>
  48 #include <sys/resource.h>
  49 #include <sys/syslog.h>
  50
  51 #include <ctype.h>
  52 #include <err.h>
  53 #include <fcntl.h>
  54 #include <pwd.h>
  55 #include <setjmp.h>
  56 #include <signal.h>
  57 #include <stdio.h>
  58 #include <stdlib.h>
  59 #include <string.h>
  60 #include <time.h>
  61 #include <tzfile.h>
  62 #include <unistd.h>
  63 #include <errno.h>
  64
  65 #include "pathnames.h"
  66
  67 #ifdef DEBUG
  68 #undef _PATH_NOLOGIN
  69 #define _PATH_NOLOGIN   "./nologin"
  70 #undef _PATH_FASTBOOT
  71 #define _PATH_FASTBOOT  "./fastboot"
  72 #endif
  73
  74 #define H               *60*60
  75 #define M               *60
  76 #define S               *1
  77 #define NOLOG_TIME      5*60
  78 static const struct interval {
  79         time_t timeleft, timetowait;
  80 } tlist[] = {
  81         { 10 H,  5 H }, {  5 H,  3 H }, {  2 H,  1 H }, { 1 H, 30 M },
  82         { 30 M, 10 M }, { 20 M, 10 M }, { 10 M,  5 M }, { 5 M,  3 M },
  83         {  2 M,  1 M }, {  1 M, 30 S }, { 30 S, 30 S },
  84         {  0, 0 }
  85 };
  86 #undef H
  87 #undef M
  88 #undef S
  89
  90 static time_t offset, shuttime;
  91 static int dofast, dohalt, doreboot, killflg, nofork, nosync, dodump;
  92 static size_t mbuflen;
  93 static int dopowerdown;
  94 static const char *whom;
  95 static char mbuf[BUFSIZ];
  96 static char *bootstr;
  97
  98 static void badtime(void) __dead;
  99 static void die_you_gravy_sucking_pig_dog(void) __dead;
 100 static void doitfast(void);
 101 void dorcshutdown(void);
 102 static void finish(int) __dead;
 103 static void getoffset(char *);
 104 static void loop(void);
 105 static void nolog(void);
 106 static void timeout(int);
 107 static void timewarn(time_t);
 108 static void usage(void) __dead;
 109
 110 int
 111 main(int argc, char *argv[])
 112 {
 113         char *p, *endp;
 114         struct passwd *pw;
 115         size_t arglen, len;
 116         int ch;
 117
 118         (void)setprogname(argv[0]);
 119 #ifndef DEBUG
 120         if (geteuid())
 121                 errx(1, "%s: Not super-user", strerror(EPERM));
 122 #endif
 123         while ((ch = getopt(argc, argv, "b:Ddfhknpr")) != -1)
 124                 switch (ch) {
 125                 case 'b':
 126                         bootstr = optarg;
 127                         break;
 128                 case 'd':
 129                         dodump = 1;
 130                         break;
 131                 case 'D':
 132                         nofork = 1;
 133                         break;
 134                 case 'f':
 135                         dofast = 1;
 136                         break;
 137                 case 'p':
 138                         dopowerdown = 1;
 139                         /* FALLTHROUGH */
 140                 case 'h':
 141                         dohalt = 1;
 142                         break;
 143                 case 'k':
 144                         killflg = 1;
 145                         break;
 146                 case 'n':
 147                         nosync = 1;
 148                         break;
 149                 case 'r':
 150                         doreboot = 1;
 151                         break;
 152                 case '?':
 153                 default:
 154                         usage();
 155                 }
 156         argc -= optind;
 157         argv += optind;
 158
 159         if (argc < 1)
 160                 usage();
 161
 162         if (dodump && !dohalt && !doreboot)
 163                 doreboot = 1;
 164
 165         if (dofast && nosync) {
 166                 warnx("Incompatible options -f and -n");
 167                 usage();
 168         }
 169         if (dohalt && doreboot) {
 170                 const char *which_flag = dopowerdown ? "p" : "h";
 171
 172                 warnx("Incompatible options -%s and -r", which_flag);
 173                 usage();
 174         }
 175
 176         getoffset(*argv++);
 177
 178         if (argv[0]) {
 179                 if (strcmp(argv[0], "-") || argv[1]) {
 180                         for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
 181                                 arglen = strlen(*argv);
 182                                 if ((len -= arglen) <= 2)
 183                                         break;
 184                                 if (p != mbuf)
 185                                         *p++ = ' ';
 186                                 (void)memmove(p, *argv, arglen);
 187                                 p += arglen;
 188                         }
 189                         *p = '\n';
 190                         *++p = '\0';
 191                 } else {
 192                         p = mbuf;
 193                         endp = mbuf + sizeof(mbuf) - 2;
 194                         for (;;) {
 195                                 if (!fgets(p, endp - p + 1, stdin))
 196                                         break;
 197                                 for (; *p &&  p < endp; ++p);
 198                                 if (p == endp) {
 199                                         *p = '\n';
 200                                         *++p = '\0';
 201                                         break;
 202                                 }
 203                         }
 204                 }
 205         }
 206         mbuflen = strlen(mbuf);
 207
 208         if (offset)
 209                 (void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
 210         else
 211                 (void)printf("Shutdown NOW!\n");
 212
 213         if (!(whom = getlogin()))
 214                 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
 215
 216 #ifdef DEBUG
 217         (void)putc('\n', stdout);
 218 #else
 219         (void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
 220         if (nofork == 0) {
 221                 int forkpid;
 222
 223                 forkpid = fork();
 224                 if (forkpid == -1) {
 225                         perror("shutdown: fork");
 226                         exit(1);
 227                 }
 228                 if (forkpid) {
 229                         (void)printf("shutdown: [pid %d]\n", forkpid);
 230                         exit(0);
 231                 }
 232                 (void)setsid();
 233         }
 234 #endif
 235         openlog("shutdown", LOG_CONS, LOG_AUTH);
 236         loop();
 237         /* NOTREACHED */
 238 #ifdef __GNUC__
 239         return 1;
 240 #endif
 241 }
 242
 243 void
 244 loop(void)
 245 {
 246         const struct interval *tp;
 247         u_int sltime;
 248         int logged;
 249
 250         if (offset <= NOLOG_TIME) {
 251                 logged = 1;
 252                 nolog();
 253         }
 254         else
 255                 logged = 0;
 256         tp = tlist;
 257         if (tp->timeleft < offset)
 258                 (void)sleep((u_int)(offset - tp->timeleft));
 259         else {
 260                 while (offset < tp->timeleft)
 261                         ++tp;
 262                 /*
 263                  * Warn now, if going to sleep more than a fifth of
 264                  * the next wait time.
 265                  */
 266                 if ((sltime = offset - tp->timeleft) != 0) {
 267                         if (sltime > tp->timetowait / 5)
 268                                 timewarn(offset);
 269                         (void)sleep(sltime);
 270                 }
 271         }
 272         for (;; ++tp) {
 273                 timewarn(tp->timeleft);
 274                 if (!logged && tp->timeleft <= NOLOG_TIME) {
 275                         logged = 1;
 276                         nolog();
 277                 }
 278                 (void)sleep((u_int)tp->timetowait);
 279                 if (!tp->timeleft)
 280                         break;
 281         }
 282         die_you_gravy_sucking_pig_dog();
 283 }
 284
 285 static jmp_buf alarmbuf;
 286
 287 void
 288 timewarn(time_t timeleft)
 289 {
 290         static int first;
 291         static char hostname[MAXHOSTNAMELEN + 1];
 292         FILE *pf;
 293         char wcmd[MAXPATHLEN + 4];
 294
 295         if (!first++) {
 296                 (void)gethostname(hostname, sizeof(hostname));
 297                 hostname[sizeof(hostname) - 1] = '\0';
 298         }
 299
 300         /* undoc -n option to wall suppresses normal wall banner */
 301         (void)snprintf(wcmd, sizeof wcmd, "%s -n", _PATH_WALL);
 302         if ((pf = popen(wcmd, "w")) == NULL) {
 303                 syslog(LOG_ERR, "%s: Can't find `%s' (%m)", getprogname(),
 304                     _PATH_WALL);
 305                 return;
 306         }
 307
 308         (void)fprintf(pf,
 309             "\007*** %sSystem shutdown message from %s@%s ***\007\n",
 310             timeleft ? "": "FINAL ", whom, hostname);
 311
 312         if (timeleft > 10*60)
 313                 (void)fprintf(pf, "System going down at %5.5s\n\n",
 314                     ctime(&shuttime) + 11);
 315         else if (timeleft > 59)
 316                 (void)fprintf(pf, "System going down in %ld minute%s\n\n",
 317                     (long)timeleft / 60, (timeleft > 60) ? "s" : "");
 318         else if (timeleft)
 319                 (void)fprintf(pf, "System going down in 30 seconds\n\n");
 320         else
 321                 (void)fprintf(pf, "System going down IMMEDIATELY\n\n");
 322
 323         if (mbuflen)
 324                 (void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
 325
 326         /*
 327          * play some games, just in case wall doesn't come back
 328          * probably unnecessary, given that wall is careful.
 329          */
 330         if (!setjmp(alarmbuf)) {
 331                 (void)signal(SIGALRM, timeout);
 332                 (void)alarm((u_int)30);
 333                 (void)pclose(pf);
 334                 (void)alarm((u_int)0);
 335                 (void)signal(SIGALRM, SIG_DFL);
 336         }
 337 }
 338
 339 static void
 340 /*ARGSUSED*/
 341 timeout(int signo)
 342 {
 343         longjmp(alarmbuf, 1);
 344 }
 345
 346 static void
 347 die_you_gravy_sucking_pig_dog(void)
 348 {
 349         const char *what;
 350
 351         if (doreboot) {
 352                 what = "reboot";
 353         } else if (dohalt && dopowerdown) {
 354                 what = "poweroff";
 355         } else if (dohalt) {
 356                 what = "halt";
 357         } else {
 358                 what = "shutdown";
 359         }
 360
 361         syslog(LOG_NOTICE, "%s by %s: %s", what, whom, mbuf);
 362         (void)sleep(2);
 363
 364         (void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
 365         if (killflg) {
 366                 (void)printf("\rbut you'll have to do it yourself\r\n");
 367                 finish(0);
 368         }
 369         if (dofast)
 370                 doitfast();
 371         dorcshutdown();
 372         if (doreboot || dohalt) {
 373                 const char *args[16];
 374                 const char **arg, *path;
 375 #ifndef DEBUG
 376                 int serrno;
 377 #endif
 378
 379                 arg = &args[0];
 380                 if (doreboot) {
 381                         path = _PATH_REBOOT;
 382                         *arg++ = "reboot";
 383                 } else {
 384                         path = _PATH_HALT;
 385                         *arg++ = "halt";
 386                 }
 387                 if (dodump)
 388                         *arg++ = "-d";
 389                 if (nosync)
 390                         *arg++ = "-n";
 391                 if (dopowerdown)
 392                         *arg++ = "-p";
 393                 *arg++ = "-l";
 394                 if (bootstr)
 395                         *arg++ = bootstr;
 396                 *arg++ = 0;
 397 #ifndef DEBUG
 398                 (void)execve(path, __UNCONST(args), NULL);
 399                 serrno = errno;
 400                 syslog(LOG_ERR, "Can't exec `%s' (%m)", path);
 401                 errno = serrno;
 402                 warn("Can't exec `%s'", path);
 403 #else
 404                 printf("%s", path);
 405                 for (arg = &args[0]; *arg; arg++)
 406                         printf(" %s", *arg);
 407                 printf("\n");
 408 #endif
 409         } else {
 410 #ifndef DEBUG
 411                 (void)kill(1, SIGTERM);         /* to single user */
 412 #else
 413                 printf("kill 1\n");
 414 #endif
 415         }
 416         finish(0);
 417 }
 418
 419 #define ATOI2(s)        ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
 420
 421 void
 422 getoffset(char *timearg)
 423 {
 424         struct tm *lt;
 425         char *p;
 426         time_t now;
 427         int yearset;
 428
 429         (void)time(&now);
 430         if (!strcasecmp(timearg, "now")) {              /* now */
 431                 offset = 0;
 432                 shuttime = now;
 433                 return;
 434         }
 435
 436         if (*timearg == '+') {                          /* +minutes */
 437                 if (!isdigit((unsigned char)*++timearg))
 438                         badtime();
 439                 offset = atoi(timearg) * 60;
 440                 shuttime = now + offset;
 441                 return;
 442         }
 443
 444         /* handle hh:mm by getting rid of the colon */
 445         for (p = timearg; *p; ++p)
 446                 if (!isascii(*p) || !isdigit((unsigned char)*p)) {
 447                         if (*p == ':' && strlen(p) == 3) {
 448                                 p[0] = p[1];
 449                                 p[1] = p[2];
 450                                 p[2] = '\0';
 451                         }
 452                         else
 453                                 badtime();
 454                 }
 455
 456         (void)unsetenv("TZ");                           /* OUR timezone */
 457         lt = localtime(&now);                           /* current time val */
 458
 459         lt->tm_sec = 0;
 460
 461         yearset = 0;
 462         switch (strlen(timearg)) {
 463         case 12:
 464                 lt->tm_year = ATOI2(timearg) * 100 - TM_YEAR_BASE;
 465                 yearset = 1;
 466                 /* FALLTHROUGH */
 467         case 10:
 468                 if (yearset) {
 469                         lt->tm_year += ATOI2(timearg);
 470                 } else {
 471                         yearset = ATOI2(timearg);
 472                         if (yearset < 69)
 473                                 lt->tm_year = yearset + 2000 - TM_YEAR_BASE;
 474                         else
 475                                 lt->tm_year = yearset + 1900 - TM_YEAR_BASE;
 476                 }
 477                 /* FALLTHROUGH */
 478         case 8:
 479                 lt->tm_mon = ATOI2(timearg);
 480                 --lt->tm_mon;
 481                 /* FALLTHROUGH */
 482         case 6:
 483                 lt->tm_mday = ATOI2(timearg);
 484                 /* FALLTHROUGH */
 485         case 4:
 486                 lt->tm_hour = ATOI2(timearg);
 487                 /* FALLTHROUGH */
 488         case 2:
 489                 lt->tm_min = ATOI2(timearg);
 490                 break;
 491         default:
 492                 badtime();
 493         }
 494
 495         if ((shuttime = mktime(lt)) == -1)
 496                 badtime();
 497         if ((offset = shuttime - now) < 0)
 498                 errx(1, "time is already past");
 499 }
 500
 501 void
 502 dorcshutdown(void)
 503 {
 504         (void)printf("\r\nAbout to run shutdown hooks...\r\n");
 505 #ifndef DEBUG
 506         (void)setuid(0);
 507         (void)system(". " _PATH_RCSHUTDOWN);
 508 #endif
 509         (void)sleep(5);         /* Give operator a chance to abort this. */
 510         (void)printf("\r\nDone running shutdown hooks.\r\n");
 511 }
 512
 513 #define FSMSG   "fastboot file for fsck\n"
 514 void
 515 doitfast(void)
 516 {
 517         int fastfd;
 518
 519         if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC,
 520             0664)) >= 0) {
 521                 (void)write(fastfd, FSMSG, sizeof(FSMSG) - 1);
 522                 (void)close(fastfd);
 523         }
 524 }
 525
 526 #define NOMSG   "\n\nNO LOGINS: System going down at "
 527 void
 528 nolog(void)
 529 {
 530         int logfd;
 531         char *ct;
 532
 533         (void)unlink(_PATH_NOLOGIN);    /* in case linked to another file */
 534         (void)signal(SIGINT, finish);
 535         (void)signal(SIGHUP, finish);
 536         (void)signal(SIGQUIT, finish);
 537         (void)signal(SIGTERM, finish);
 538         if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
 539             0664)) >= 0) {
 540                 (void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
 541                 ct = ctime(&shuttime);
 542                 (void)write(logfd, ct + 11, 5);
 543                 (void)write(logfd, "\n\n", 2);
 544                 (void)write(logfd, mbuf, strlen(mbuf));
 545                 (void)close(logfd);
 546         }
 547 }
 548
 549 static void
 550 /*ARGSUSED*/
 551 finish(int signo)
 552 {
 553
 554         if (!killflg)
 555                 (void)unlink(_PATH_NOLOGIN);
 556         exit(0);
 557 }
 558
 559 static void
 560 badtime(void)
 561 {
 562
 563         warnx("illegal time format");
 564         usage();
 565 }
 566
 567 static void
 568 usage(void)
 569 {
 570
 571         (void)fprintf(stderr,
 572             "Usage: %s [-Ddfhknpr] time [message ... | -]\n",
 573             getprogname());
 574         exit(1);
 575 }