sbin/shutdown/shutdown.c

   1 /*      $NetBSD: shutdown.c,v 1.56 2014/03/28 18:27:14 apb 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 1.56 2014/03/28 18:27:14 apb 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 int dodebug, dosilent, doverbose;
  95 static const char *whom;
  96 static char mbuf[BUFSIZ];
  97 static char *bootstr;
  98
  99 static void badtime(void) __dead;
 100 static void die_you_gravy_sucking_pig_dog(void) __dead;
 101 static void doitfast(void);
 102 static void dorcshutdown(void);
 103 static void finish(int) __dead;
 104 static void getoffset(char *);
 105 static void loop(void) __dead;
 106 static void nolog(void);
 107 static void timeout(int) __dead;
 108 static void timewarn(time_t);
 109 static void usage(void) __dead;
 110
 111 int
 112 main(int argc, char *argv[])
 113 {
 114         char *p, *endp;
 115         struct passwd *pw;
 116         size_t arglen, len;
 117         int ch;
 118
 119         (void)setprogname(argv[0]);
 120 #ifndef DEBUG
 121         if (geteuid())
 122                 errx(1, "%s: Not super-user", strerror(EPERM));
 123 #endif
 124         while ((ch = getopt(argc, argv, "b:Ddfhknprvxz")) != -1)
 125                 switch (ch) {
 126                 case 'b':
 127                         bootstr = optarg;
 128                         break;
 129                 case 'd':
 130                         dodump = 1;
 131                         break;
 132                 case 'D':
 133                         nofork = 1;
 134                         break;
 135                 case 'f':
 136                         dofast = 1;
 137                         break;
 138                 case 'p':
 139                         dopowerdown = 1;
 140                         /* FALLTHROUGH */
 141                 case 'h':
 142                         dohalt = 1;
 143                         break;
 144                 case 'k':
 145                         killflg = 1;
 146                         break;
 147                 case 'n':
 148                         nosync = 1;
 149                         break;
 150                 case 'r':
 151                         doreboot = 1;
 152                         break;
 153                 case 'v':
 154                         doverbose = 1;
 155                         break;
 156                 case 'x':
 157                         dodebug = 1;
 158                         break;
 159                 case 'z':
 160                         dosilent = 1;
 161                         break;
 162                 case '?':
 163                 default:
 164                         usage();
 165                 }
 166         argc -= optind;
 167         argv += optind;
 168
 169         if (argc < 1)
 170                 usage();
 171
 172         if (dodump && !dohalt && !doreboot)
 173                 doreboot = 1;
 174
 175         if (dofast && nosync) {
 176                 warnx("Incompatible options -f and -n");
 177                 usage();
 178         }
 179         if (dohalt && doreboot) {
 180                 const char *which_flag = dopowerdown ? "p" : "h";
 181
 182                 warnx("Incompatible options -%s and -r", which_flag);
 183                 usage();
 184         }
 185
 186         getoffset(*argv++);
 187
 188         if (argv[0]) {
 189                 if (strcmp(argv[0], "-") || argv[1]) {
 190                         for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
 191                                 arglen = strlen(*argv);
 192                                 if ((len -= arglen) <= 2)
 193                                         break;
 194                                 if (p != mbuf)
 195                                         *p++ = ' ';
 196                                 (void)memmove(p, *argv, arglen);
 197                                 p += arglen;
 198                         }
 199                         *p = '\n';
 200                         *++p = '\0';
 201                 } else {
 202                         p = mbuf;
 203                         endp = mbuf + sizeof(mbuf) - 2;
 204                         for (;;) {
 205                                 if (!fgets(p, endp - p + 1, stdin))
 206                                         break;
 207                                 for (; *p &&  p < endp; ++p);
 208                                 if (p == endp) {
 209                                         *p = '\n';
 210                                         *++p = '\0';
 211                                         break;
 212                                 }
 213                         }
 214                 }
 215         }
 216         mbuflen = strlen(mbuf);
 217
 218         if (offset)
 219                 (void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
 220         else
 221                 (void)printf("Shutdown NOW!\n");
 222
 223         if (!(whom = getlogin()))
 224                 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
 225
 226 #ifdef DEBUG
 227         (void)putc('\n', stdout);
 228 #else
 229         (void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
 230         if (nofork == 0) {
 231                 int forkpid;
 232
 233                 forkpid = fork();
 234                 if (forkpid == -1) {
 235                         perror("shutdown: fork");
 236                         exit(1);
 237                 }
 238                 if (forkpid) {
 239                         (void)printf("shutdown: [pid %d]\n", forkpid);
 240                         exit(0);
 241                 }
 242                 (void)setsid();
 243         }
 244 #endif
 245         openlog("shutdown", LOG_CONS, LOG_AUTH);
 246         loop();
 247         /* NOTREACHED */
 248 #ifdef __GNUC__
 249         return 1;
 250 #endif
 251 }
 252
 253 static void
 254 loop(void)
 255 {
 256         const struct interval *tp;
 257         u_int sltime;
 258         int logged;
 259
 260         if (offset <= NOLOG_TIME) {
 261                 logged = 1;
 262                 nolog();
 263         }
 264         else
 265                 logged = 0;
 266         tp = tlist;
 267         if (tp->timeleft < offset)
 268                 (void)sleep((u_int)(offset - tp->timeleft));
 269         else {
 270                 while (offset < tp->timeleft)
 271                         ++tp;
 272                 /*
 273                  * Warn now, if going to sleep more than a fifth of
 274                  * the next wait time.
 275                  */
 276                 if ((sltime = offset - tp->timeleft) != 0) {
 277                         if (sltime > tp->timetowait / 5)
 278                                 timewarn(offset);
 279                         (void)sleep(sltime);
 280                 }
 281         }
 282         for (;; ++tp) {
 283                 timewarn(tp->timeleft);
 284                 if (!logged && tp->timeleft <= NOLOG_TIME) {
 285                         logged = 1;
 286                         nolog();
 287                 }
 288                 (void)sleep((u_int)tp->timetowait);
 289                 if (!tp->timeleft)
 290                         break;
 291         }
 292         die_you_gravy_sucking_pig_dog();
 293 }
 294
 295 static jmp_buf alarmbuf;
 296
 297 static void
 298 timewarn(time_t timeleft)
 299 {
 300         static int first;
 301         static char hostname[MAXHOSTNAMELEN + 1];
 302         FILE *pf;
 303         char wcmd[MAXPATHLEN + 4];
 304
 305         if (!first++) {
 306                 (void)gethostname(hostname, sizeof(hostname));
 307                 hostname[sizeof(hostname) - 1] = '\0';
 308         }
 309
 310         /* undoc -n option to wall suppresses normal wall banner */
 311         (void)snprintf(wcmd, sizeof wcmd, "%s -n", _PATH_WALL);
 312         if ((pf = popen(wcmd, "w")) == NULL) {
 313                 syslog(LOG_ERR, "%s: Can't find `%s' (%m)", getprogname(),
 314                     _PATH_WALL);
 315                 return;
 316         }
 317
 318         (void)fprintf(pf,
 319             "\007*** %sSystem shutdown message from %s@%s ***\007\n",
 320             timeleft ? "": "FINAL ", whom, hostname);
 321
 322         if (timeleft > 10*60)
 323                 (void)fprintf(pf, "System going down at %5.5s\n\n",
 324                     ctime(&shuttime) + 11);
 325         else if (timeleft > 59)
 326                 (void)fprintf(pf, "System going down in %ld minute%s\n\n",
 327                     (long)timeleft / 60, (timeleft > 60) ? "s" : "");
 328         else if (timeleft)
 329                 (void)fprintf(pf, "System going down in 30 seconds\n\n");
 330         else
 331                 (void)fprintf(pf, "System going down IMMEDIATELY\n\n");
 332
 333         if (mbuflen)
 334                 (void)fwrite(mbuf, 1, mbuflen, pf);
 335
 336         /*
 337          * play some games, just in case wall doesn't come back
 338          * probably unnecessary, given that wall is careful.
 339          */
 340         if (!setjmp(alarmbuf)) {
 341                 (void)signal(SIGALRM, timeout);
 342                 (void)alarm((u_int)30);
 343                 (void)pclose(pf);
 344                 (void)alarm((u_int)0);
 345                 (void)signal(SIGALRM, SIG_DFL);
 346         }
 347 }
 348
 349 static void
 350 /*ARGSUSED*/
 351 timeout(int signo)
 352 {
 353         longjmp(alarmbuf, 1);
 354 }
 355
 356 static void
 357 die_you_gravy_sucking_pig_dog(void)
 358 {
 359         const char *what;
 360
 361         if (doreboot) {
 362                 what = "reboot";
 363         } else if (dohalt && dopowerdown) {
 364                 what = "poweroff";
 365         } else if (dohalt) {
 366                 what = "halt";
 367         } else {
 368                 what = "shutdown";
 369         }
 370
 371         syslog(LOG_NOTICE, "%s by %s: %s", what, whom, mbuf);
 372         (void)sleep(2);
 373
 374         (void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
 375         if (killflg) {
 376                 (void)printf("\rbut you'll have to do it yourself\r\n");
 377                 finish(0);
 378         }
 379         if (dofast)
 380                 doitfast();
 381         dorcshutdown();
 382         if (doreboot || dohalt) {
 383                 const char *args[20];
 384                 const char **arg, *path;
 385 #ifndef DEBUG
 386                 int serrno;
 387 #endif
 388
 389                 arg = &args[0];
 390                 if (doreboot) {
 391                         path = _PATH_REBOOT;
 392                         *arg++ = "reboot";
 393                 } else {
 394                         path = _PATH_HALT;
 395                         *arg++ = "halt";
 396                 }
 397                 if (doverbose)
 398                         *arg++ = "-v";
 399                 if (dodebug)
 400                         *arg++ = "-x";
 401                 if (dosilent)
 402                         *arg++ = "-z";
 403                 if (dodump)
 404                         *arg++ = "-d";
 405                 if (nosync)
 406                         *arg++ = "-n";
 407                 if (dopowerdown)
 408                         *arg++ = "-p";
 409                 *arg++ = "-l";
 410                 if (bootstr)
 411                         *arg++ = bootstr;
 412                 *arg++ = 0;
 413 #ifndef DEBUG
 414                 (void)unlink(_PATH_NOLOGIN);
 415                 (void)execve(path, __UNCONST(args), NULL);
 416                 serrno = errno;
 417                 syslog(LOG_ERR, "Can't exec `%s' (%m)", path);
 418                 errno = serrno;
 419                 warn("Can't exec `%s'", path);
 420 #else
 421                 printf("%s", path);
 422                 for (arg = &args[0]; *arg; arg++)
 423                         printf(" %s", *arg);
 424                 printf("\n");
 425 #endif
 426         } else {
 427 #ifndef DEBUG
 428                 (void)kill(1, SIGTERM);         /* to single user */
 429 #else
 430                 printf("kill 1\n");
 431 #endif
 432         }
 433         finish(0);
 434 }
 435
 436 #define ATOI2(s)        ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0'))
 437
 438 static void
 439 getoffset(char *timearg)
 440 {
 441         struct tm *lt;
 442         char *p;
 443         time_t now;
 444         int yearset;
 445
 446         (void)time(&now);
 447         if (!strcasecmp(timearg, "now")) {              /* now */
 448                 offset = 0;
 449                 shuttime = now;
 450                 return;
 451         }
 452
 453         if (*timearg == '+') {                          /* +minutes */
 454                 if (!isdigit((unsigned char)*++timearg))
 455                         badtime();
 456                 offset = atoi(timearg) * 60;
 457                 shuttime = now + offset;
 458                 return;
 459         }
 460
 461         /* handle hh:mm by getting rid of the colon */
 462         for (p = timearg; *p; ++p)
 463                 if (!isascii(*p) || !isdigit((unsigned char)*p)) {
 464                         if (*p == ':' && strlen(p) == 3) {
 465                                 p[0] = p[1];
 466                                 p[1] = p[2];
 467                                 p[2] = '\0';
 468                         }
 469                         else
 470                                 badtime();
 471                 }
 472
 473         (void)unsetenv("TZ");                           /* OUR timezone */
 474         lt = localtime(&now);                           /* current time val */
 475
 476         lt->tm_sec = 0;
 477
 478         yearset = 0;
 479         switch (strlen(timearg)) {
 480         case 12:
 481                 lt->tm_year = ATOI2(timearg) * 100 - TM_YEAR_BASE;
 482                 yearset = 1;
 483                 /* FALLTHROUGH */
 484         case 10:
 485                 if (yearset) {
 486                         lt->tm_year += ATOI2(timearg);
 487                 } else {
 488                         yearset = ATOI2(timearg);
 489                         if (yearset < 69)
 490                                 lt->tm_year = yearset + 2000 - TM_YEAR_BASE;
 491                         else
 492                                 lt->tm_year = yearset + 1900 - TM_YEAR_BASE;
 493                 }
 494                 /* FALLTHROUGH */
 495         case 8:
 496                 lt->tm_mon = ATOI2(timearg);
 497                 --lt->tm_mon;
 498                 /* FALLTHROUGH */
 499         case 6:
 500                 lt->tm_mday = ATOI2(timearg);
 501                 /* FALLTHROUGH */
 502         case 4:
 503                 lt->tm_hour = ATOI2(timearg);
 504                 /* FALLTHROUGH */
 505         case 2:
 506                 lt->tm_min = ATOI2(timearg);
 507                 break;
 508         default:
 509                 badtime();
 510         }
 511
 512         if ((shuttime = mktime(lt)) == -1)
 513                 badtime();
 514         if ((offset = shuttime - now) < 0)
 515                 errx(1, "time is already past");
 516 }
 517
 518 static void
 519 dorcshutdown(void)
 520 {
 521         (void)printf("\r\nAbout to run shutdown hooks...\r\n");
 522 #ifndef DEBUG
 523         (void)setuid(0);
 524         (void)system(". " _PATH_RCSHUTDOWN);
 525 #endif
 526         (void)sleep(5);         /* Give operator a chance to abort this. */
 527         (void)printf("\r\nDone running shutdown hooks.\r\n");
 528 }
 529
 530 #define FSMSG   "fastboot file for fsck\n"
 531 static void
 532 doitfast(void)
 533 {
 534         int fastfd;
 535
 536         if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC,
 537             0664)) >= 0) {
 538                 (void)write(fastfd, FSMSG, sizeof(FSMSG) - 1);
 539                 (void)close(fastfd);
 540         }
 541 }
 542
 543 #define NOMSG   "\n\nNO LOGINS: System going down at "
 544 static void
 545 nolog(void)
 546 {
 547         int logfd;
 548         char *ct;
 549
 550         (void)unlink(_PATH_NOLOGIN);    /* in case linked to another file */
 551         (void)signal(SIGINT, finish);
 552         (void)signal(SIGHUP, finish);
 553         (void)signal(SIGQUIT, finish);
 554         (void)signal(SIGTERM, finish);
 555         if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
 556             0664)) >= 0) {
 557                 (void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
 558                 ct = ctime(&shuttime);
 559                 (void)write(logfd, ct + 11, 5);
 560                 (void)write(logfd, "\n\n", 2);
 561                 (void)write(logfd, mbuf, strlen(mbuf));
 562                 (void)close(logfd);
 563         }
 564 }
 565
 566 static void
 567 /*ARGSUSED*/
 568 finish(int signo)
 569 {
 570
 571         if (!killflg)
 572                 (void)unlink(_PATH_NOLOGIN);
 573         exit(0);
 574 }
 575
 576 static void
 577 badtime(void)
 578 {
 579
 580         warnx("illegal time format");
 581         usage();
 582 }
 583
 584 static void
 585 usage(void)
 586 {
 587
 588         (void)fprintf(stderr,
 589             "Usage: %s [-Ddfhknprvxz] [-b bootstr] time [message ... | -]\n",
 590             getprogname());
 591         exit(1);
 592 }