system_cmds/shutdown.tproj/shutdown.c

   1 /*
   2  * Copyright (c) 1988, 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  * Portions copyright (c) 2007 Apple Inc.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 3. Neither the name of the University nor the names of its contributors
  15  *    may be used to endorse or promote products derived from this software
  16  *    without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  */
  30
  31 #if 0
  32 #ifndef lint
  33 static const char copyright[] =
  34 "@(#) Copyright (c) 1988, 1990, 1993\n\
  35         The Regents of the University of California.  All rights reserved.\n";
  36 #endif /* not lint */
  37
  38 #ifndef lint
  39 static char sccsid[] = "@(#)shutdown.c  8.4 (Berkeley) 4/28/95";
  40 #endif /* not lint */
  41 #endif
  42 #include <sys/cdefs.h>
  43 #ifndef __APPLE__
  44 __FBSDID("$FreeBSD: src/sbin/shutdown/shutdown.c,v 1.28 2005/01/25 08:40:51 delphij Exp $");
  45 #endif
  46
  47 #include <sys/param.h>
  48 #include <sys/time.h>
  49 #include <sys/resource.h>
  50 #include <sys/syslog.h>
  51
  52 #include <ctype.h>
  53 #include <err.h>
  54 #include <fcntl.h>
  55 #include <paths.h>
  56 #include <pwd.h>
  57 #include <setjmp.h>
  58 #include <signal.h>
  59 #include <stdio.h>
  60 #include <stdlib.h>
  61 #include <string.h>
  62 #include <unistd.h>
  63
  64 #ifdef __APPLE__
  65 #include <errno.h>
  66 #include <util.h>
  67 typedef char *kobject_description_t[512];
  68 #include <bsm/libbsm.h>
  69 #include <bsm/audit_uevents.h>
  70 #include <sys/types.h>
  71 #include <sys/sysctl.h>
  72 #include <vproc.h>
  73 #include <vproc_priv.h>
  74
  75 #if defined(__APPLE__) && !(TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR)
  76 #include "kextmanager.h"
  77 #include <IOKit/kext/kextmanager_types.h>
  78 #endif
  79 #include <IOKit/pwr_mgt/IOPMLib.h>
  80 #include <mach/mach_port.h>             // allocate
  81 #include <mach/mach.h>                  // task_self, etc
  82 #include <servers/bootstrap.h>  // bootstrap
  83 #include <bootstrap_priv.h>
  84 #include <reboot2.h>
  85 #include <utmpx.h>
  86
  87 #include "pathnames.h"
  88 #endif /* __APPLE__ */
  89
  90 #include <libiosexec.h>
  91
  92 int     reboot3(int);
  93
  94 #ifdef DEBUG
  95 #undef _PATH_NOLOGIN
  96 #define _PATH_NOLOGIN   "./nologin"
  97 #endif
  98
  99 #define H               *60*60
 100 #define M               *60
 101 #define S               *1
 102 #define NOLOG_TIME      5*60
 103 struct interval {
 104         int timeleft, timetowait;
 105 } tlist[] = {
 106         { 10 H,  5 H },
 107         {  5 H,  3 H },
 108         {  2 H,  1 H },
 109         {  1 H, 30 M },
 110         { 30 M, 10 M },
 111         { 20 M, 10 M },
 112         { 10 M,  5 M },
 113         {  5 M,  3 M },
 114         {  2 M,  1 M },
 115         {  1 M, 30 S },
 116         { 30 S, 30 S },
 117         {  0  ,  0   }
 118 };
 119 #undef H
 120 #undef M
 121 #undef S
 122
 123 static time_t offset, shuttime;
 124 #ifdef __APPLE__
 125 static int dohalt, doreboot, doups, killflg, oflag;
 126 static size_t mbuflen;
 127 #else
 128 static int dohalt, dopower, doreboot, killflg, mbuflen, oflag;
 129 #endif
 130 static char mbuf[BUFSIZ];
 131 static const char *nosync, *whom;
 132 #ifdef __APPLE__
 133 static int dosleep;
 134 #endif
 135
 136 void badtime(void);
 137 #ifdef __APPLE__
 138 void log_and_exec_reboot_or_halt(void);
 139 #else
 140 void die_you_gravy_sucking_pig_dog(void);
 141 #endif
 142 void finish(int);
 143 void getoffset(char *);
 144 void loop(void);
 145 void nolog(void);
 146 void timeout(int);
 147 void timewarn(time_t);
 148 void usage(const char *);
 149 int audit_shutdown(int);
 150 #if defined(__APPLE__) && !(TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR)
 151 int reserve_reboot(void);
 152 #endif
 153
 154 extern const char **environ;
 155
 156 int
 157 main(int argc, char **argv)
 158 {
 159         char *p, *endp;
 160         struct passwd *pw;
 161         size_t arglen;
 162         int ch, len, readstdin;
 163
 164 #ifndef DEBUG
 165         if (geteuid())
 166                 errx(1, "NOT super-user");
 167 #endif
 168         nosync = NULL;
 169         readstdin = 0;
 170 #ifndef __APPLE__
 171         while ((ch = getopt(argc, argv, "-hknopr")) != -1)
 172 #else
 173         while ((ch = getopt(argc, argv, "-hknorsu")) != -1)
 174 #endif
 175                 switch (ch) {
 176                 case '-':
 177                         readstdin = 1;
 178                         break;
 179                 case 'h':
 180                         dohalt = 1;
 181                         break;
 182                 case 'k':
 183                         killflg = 1;
 184                         break;
 185                 case 'n':
 186                         nosync = "-n";
 187                         break;
 188                 case 'o':
 189                         oflag = 1;
 190                         break;
 191 #ifndef __APPLE__
 192                 case 'p':
 193                         dopower = 1;
 194                         break;
 195 #endif
 196         case 'u':
 197             doups = 1;
 198             break;
 199                 case 'r':
 200                         doreboot = 1;
 201                         break;
 202 #ifdef __APPLE__
 203                 case 's':
 204                         dosleep = 1;
 205                         break;
 206 #endif
 207                 case '?':
 208                 default:
 209                         usage((char *)NULL);
 210                 }
 211         argc -= optind;
 212         argv += optind;
 213
 214         if (argc < 1)
 215                 usage((char *)NULL);
 216
 217 #ifndef __APPLE__
 218         if (killflg + doreboot + dohalt + dopower > 1)
 219                 usage("incompatible switches -h, -k, -p and -r");
 220
 221         if (oflag && !(dohalt || dopower || doreboot))
 222                 usage("-o requires -h, -p or -r");
 223
 224         if (nosync != NULL && !oflag)
 225                 usage("-n requires -o");
 226 #else /* !__APPLE__ */
 227         if (killflg + doreboot + dohalt + dosleep > 1)
 228                 usage("incompatible switches -h, -k, -r, and -s");
 229
 230         if (!(dohalt || doreboot || dosleep || killflg))
 231                 usage("-h, -r, -s, or -k is required");
 232
 233         if (doups && !dohalt)
 234                 usage("-u requires -h");
 235 #endif /* !__APPLE__ */
 236
 237         getoffset(*argv++);
 238
 239         if (*argv) {
 240                 for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
 241                         arglen = strlen(*argv);
 242                         if ((len -= arglen) <= 2)
 243                                 break;
 244                         if (p != mbuf)
 245                                 *p++ = ' ';
 246                         memmove(p, *argv, arglen);
 247                         p += arglen;
 248                 }
 249                 *p = '\n';
 250                 *++p = '\0';
 251         }
 252
 253         if (readstdin) {
 254                 p = mbuf;
 255                 endp = mbuf + sizeof(mbuf) - 2;
 256                 for (;;) {
 257                         if (!fgets(p, (int)(endp - p + 1), stdin))
 258                                 break;
 259                         for (; *p &&  p < endp; ++p);
 260                         if (p == endp) {
 261                                 *p = '\n';
 262                                 *++p = '\0';
 263                                 break;
 264                         }
 265                 }
 266         }
 267         mbuflen = strlen(mbuf);
 268
 269         if (offset)
 270                 (void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
 271         else
 272                 (void)printf("Shutdown NOW!\n");
 273
 274         if (!(whom = getlogin()))
 275                 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
 276
 277 #ifdef DEBUG
 278         audit_shutdown(0);
 279         (void)putc('\n', stdout);
 280 #else
 281         (void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
 282 #ifdef __APPLE__
 283         if (offset) {
 284 #else
 285         {
 286 #endif
 287                 int forkpid;
 288
 289                 forkpid = fork();
 290                 if (forkpid == -1) {
 291                         audit_shutdown(1);
 292                         err(1, "fork");
 293                 }
 294                 if (forkpid)
 295                         errx(0, "[pid %d]", forkpid);
 296 #ifdef __APPLE__
 297                 /* 5863185: reboot2() needs to talk to launchd. */
 298                 if (_vprocmgr_detach_from_console(0) != NULL)
 299                         warnx("can't detach from console");
 300 #endif /* __APPLE__ */
 301         }
 302         audit_shutdown(0);
 303         setsid();
 304 #endif
 305         openlog("shutdown", LOG_CONS, LOG_AUTH);
 306         loop();
 307         return(0);
 308 }
 309
 310 void
 311 loop(void)
 312 {
 313         struct interval *tp;
 314         u_int sltime;
 315         int logged;
 316
 317         if (offset <= NOLOG_TIME) {
 318                 logged = 1;
 319                 nolog();
 320         }
 321         else
 322                 logged = 0;
 323         tp = tlist;
 324         if (tp->timeleft < offset)
 325                 (void)sleep((u_int)(offset - tp->timeleft));
 326         else {
 327                 while (tp->timeleft && offset < tp->timeleft)
 328                         ++tp;
 329                 /*
 330                  * Warn now, if going to sleep more than a fifth of
 331                  * the next wait time.
 332                  */
 333                 if ((sltime = (u_int)(offset - tp->timeleft))) {
 334                         if (sltime > (tp->timetowait / 5))
 335                                 timewarn(offset);
 336                         (void)sleep(sltime);
 337                 }
 338         }
 339         for (;; ++tp) {
 340                 timewarn(tp->timeleft);
 341                 if (!logged && tp->timeleft <= NOLOG_TIME) {
 342                         logged = 1;
 343                         nolog();
 344                 }
 345                 (void)sleep((u_int)tp->timetowait);
 346                 if (!tp->timeleft)
 347                         break;
 348         }
 349 #ifdef __APPLE__
 350         log_and_exec_reboot_or_halt();
 351 #else
 352         die_you_gravy_sucking_pig_dog();
 353 #endif
 354 }
 355
 356 static jmp_buf alarmbuf;
 357
 358 static const char *restricted_environ[] = {
 359         "PATH=" _PATH_STDPATH,
 360         NULL
 361 };
 362
 363 void
 364 timewarn(time_t timeleft)
 365 {
 366         static int first;
 367         static char hostname[MAXHOSTNAMELEN + 1];
 368         FILE *pf;
 369         char wcmd[MAXPATHLEN + 4];
 370
 371         /* wall is sometimes missing, e.g. on install media */
 372         if (access(_PATH_WALL, X_OK) == -1) return;
 373
 374         if (!first++)
 375                 (void)gethostname(hostname, sizeof(hostname));
 376
 377         /* undoc -n option to wall suppresses normal wall banner */
 378         (void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL);
 379         environ = restricted_environ;
 380         if (!(pf = popen(wcmd, "w"))) {
 381                 syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
 382                 return;
 383         }
 384
 385         (void)fprintf(pf,
 386             "\007*** %sSystem shutdown message from %s@%s ***\007\n",
 387             timeleft ? "": "FINAL ", whom, hostname);
 388
 389         if (timeleft > 10*60)
 390                 (void)fprintf(pf, "System going down at %5.5s\n\n",
 391                     ctime(&shuttime) + 11);
 392         else if (timeleft > 59)
 393                 (void)fprintf(pf, "System going down in %ld minute%s\n\n",
 394                     timeleft / 60, (timeleft > 60) ? "s" : "");
 395         else if (timeleft)
 396                 (void)fprintf(pf, "System going down in 30 seconds\n\n");
 397         else
 398                 (void)fprintf(pf, "System going down IMMEDIATELY\n\n");
 399
 400         if (mbuflen)
 401                 (void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
 402
 403         /*
 404          * play some games, just in case wall doesn't come back
 405          * probably unnecessary, given that wall is careful.
 406          */
 407         if (!setjmp(alarmbuf)) {
 408                 (void)signal(SIGALRM, timeout);
 409                 (void)alarm((u_int)30);
 410                 (void)pclose(pf);
 411                 (void)alarm((u_int)0);
 412                 (void)signal(SIGALRM, SIG_DFL);
 413         }
 414 }
 415
 416 void
 417 timeout(int signo __unused)
 418 {
 419         longjmp(alarmbuf, 1);
 420 }
 421
 422 void
 423 #ifdef __APPLE__
 424 log_and_exec_reboot_or_halt()
 425 #else
 426 die_you_gravy_sucking_pig_dog()
 427 #endif
 428 {
 429 #if defined(__APPLE__) && !(TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR)
 430         if ((errno = reserve_reboot())) {
 431                 warn("couldn't lock for reboot");
 432                 finish(0);
 433         }
 434 #else
 435         char *empty_environ[] = { NULL };
 436 #endif
 437
 438         syslog(LOG_NOTICE, "%s%s by %s: %s",
 439 #ifndef __APPLE__
 440             doreboot ? "reboot" : dohalt ? "halt" : dopower ? "power-down" :
 441 #else
 442             doreboot ? "reboot" : dohalt ? "halt" : dosleep ? "sleep" :
 443 #endif
 444             "shutdown", doups?" with UPS delay":"", whom, mbuf);
 445 #ifndef __APPLE__
 446         (void)sleep(2);
 447 #endif
 448
 449         (void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
 450         if (killflg) {
 451                 (void)printf("\rbut you'll have to do it yourself\r\n");
 452                 exit(0);
 453         }
 454 #ifdef DEBUG
 455         if (doreboot)
 456                 (void)printf("reboot");
 457         else if (dohalt)
 458                 (void)printf("halt");
 459 #ifndef __APPLE__
 460         else if (dopower)
 461                 (void)printf("power-down");
 462         if (nosync != NULL)
 463                 (void)printf(" no sync");
 464 #else
 465         else if (dosleep)
 466                 (void)printf("sleep");
 467 #endif
 468         (void)printf("\nkill -HUP 1\n");
 469 #else
 470 #ifdef __APPLE__
 471         if (dosleep) {
 472                 mach_port_t mp;
 473                 io_connect_t fb;
 474                 kern_return_t kr = IOMasterPort(bootstrap_port, &mp);
 475                 if (kr == kIOReturnSuccess) {
 476                         fb = IOPMFindPowerManagement(mp);
 477                         if (fb != IO_OBJECT_NULL) {
 478                                 IOReturn err = IOPMSleepSystem(fb);
 479                                 if (err != kIOReturnSuccess) {
 480                                         fprintf(stderr, "shutdown: sleep failed (0x%08x)\n", err);
 481                                         kr = -1;
 482                                 }
 483                         }
 484                 }
 485         } else {
 486                 int howto = 0;
 487
 488 #if defined(__APPLE__)
 489                 {
 490                         struct utmpx utx;
 491                         bzero(&utx, sizeof(utx));
 492                         utx.ut_type = SHUTDOWN_TIME;
 493                         gettimeofday(&utx.ut_tv, NULL);
 494                         pututxline(&utx);
 495                 }
 496 #else
 497                 logwtmp("~", "shutdown", "");
 498 #endif
 499
 500                 if (dohalt) howto |= RB_HALT;
 501                 if (doups) howto |= RB_UPSDELAY;
 502                 if (nosync) howto |= RB_NOSYNC;
 503
 504                 // launchd(8) handles reboot.  This call returns NULL on success.
 505                 if (reboot3(howto)) {
 506                         syslog(LOG_ERR, "shutdown: launchd reboot failed.");
 507                 }
 508         }
 509 #else /* __APPLE__ */
 510         if (!oflag) {
 511                 (void)kill(1, doreboot ? SIGINT :       /* reboot */
 512                               dohalt ? SIGUSR1 :        /* halt */
 513                               dopower ? SIGUSR2 :       /* power-down */
 514                               SIGTERM);                 /* single-user */
 515         } else {
 516                 if (doreboot) {
 517                         execle(_PATH_REBOOT, "reboot", "-l", nosync,
 518                                 (char *)NULL, empty_environ);
 519                         syslog(LOG_ERR, "shutdown: can't exec %s: %m.",
 520                                 _PATH_REBOOT);
 521                         warn(_PATH_REBOOT);
 522                 }
 523                 else if (dohalt) {
 524                         execle(_PATH_HALT, "halt", "-l", nosync,
 525                                 (char *)NULL, empty_environ);
 526                         syslog(LOG_ERR, "shutdown: can't exec %s: %m.",
 527                                 _PATH_HALT);
 528                         warn(_PATH_HALT);
 529                 }
 530                 else if (dopower) {
 531                         execle(_PATH_HALT, "halt", "-l", "-p", nosync,
 532                                 (char *)NULL, empty_environ);
 533                         syslog(LOG_ERR, "shutdown: can't exec %s: %m.",
 534                                 _PATH_HALT);
 535                         warn(_PATH_HALT);
 536                 }
 537                 (void)kill(1, SIGTERM);         /* to single-user */
 538         }
 539 #endif /* __APPLE__ */
 540 #endif
 541         finish(0);
 542 }
 543
 544 #define ATOI2(p)        (p[0] - '0') * 10 + (p[1] - '0'); p += 2;
 545
 546 void
 547 getoffset(char *timearg)
 548 {
 549         struct tm *lt;
 550         char *p;
 551         time_t now;
 552         int this_year;
 553
 554         (void)time(&now);
 555
 556         if (!strcasecmp(timearg, "now")) {              /* now */
 557                 offset = 0;
 558                 shuttime = now;
 559                 return;
 560         }
 561
 562         if (*timearg == '+') {                          /* +minutes */
 563                 if (!isdigit(*++timearg))
 564                         badtime();
 565                 if ((offset = atoi(timearg) * 60) < 0)
 566                         badtime();
 567                 shuttime = now + offset;
 568                 return;
 569         }
 570
 571         /* handle hh:mm by getting rid of the colon */
 572         for (p = timearg; *p; ++p)
 573                 if (!isascii(*p) || !isdigit(*p)) {
 574                         if (*p == ':' && strlen(p) == 3) {
 575                                 p[0] = p[1];
 576                                 p[1] = p[2];
 577                                 p[2] = '\0';
 578                         }
 579                         else
 580                                 badtime();
 581                 }
 582
 583         unsetenv("TZ");                                 /* OUR timezone */
 584         lt = localtime(&now);                           /* current time val */
 585
 586         switch(strlen(timearg)) {
 587         case 10:
 588                 this_year = lt->tm_year;
 589                 lt->tm_year = ATOI2(timearg);
 590                 /*
 591                  * check if the specified year is in the next century.
 592                  * allow for one year of user error as many people will
 593                  * enter n - 1 at the start of year n.
 594                  */
 595                 if (lt->tm_year < (this_year % 100) - 1)
 596                         lt->tm_year += 100;
 597                 /* adjust for the year 2000 and beyond */
 598                 lt->tm_year += (this_year - (this_year % 100));
 599                 /* FALLTHROUGH */
 600         case 8:
 601                 lt->tm_mon = ATOI2(timearg);
 602                 if (--lt->tm_mon < 0 || lt->tm_mon > 11)
 603                         badtime();
 604                 /* FALLTHROUGH */
 605         case 6:
 606                 lt->tm_mday = ATOI2(timearg);
 607                 if (lt->tm_mday < 1 || lt->tm_mday > 31)
 608                         badtime();
 609                 /* FALLTHROUGH */
 610         case 4:
 611                 lt->tm_hour = ATOI2(timearg);
 612                 if (lt->tm_hour < 0 || lt->tm_hour > 23)
 613                         badtime();
 614                 lt->tm_min = ATOI2(timearg);
 615                 if (lt->tm_min < 0 || lt->tm_min > 59)
 616                         badtime();
 617                 lt->tm_sec = 0;
 618                 if ((shuttime = mktime(lt)) == -1)
 619                         badtime();
 620                 if ((offset = shuttime - now) < 0)
 621                         errx(1, "that time is already past.");
 622                 break;
 623         default:
 624                 badtime();
 625         }
 626 }
 627
 628 #define NOMSG   "\n\nNO LOGINS: System going down at "
 629 void
 630 nolog(void)
 631 {
 632         int logfd;
 633         char *ct;
 634
 635         (void)unlink(_PATH_NOLOGIN);    /* in case linked to another file */
 636         (void)signal(SIGINT, finish);
 637         (void)signal(SIGHUP, finish);
 638         (void)signal(SIGQUIT, finish);
 639         (void)signal(SIGTERM, finish);
 640         if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
 641             0664)) >= 0) {
 642                 (void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
 643                 ct = ctime(&shuttime);
 644                 (void)write(logfd, ct + 11, 5);
 645                 (void)write(logfd, "\n\n", 2);
 646                 (void)write(logfd, mbuf, strlen(mbuf));
 647                 (void)close(logfd);
 648         }
 649 }
 650
 651 void
 652 finish(int signo __unused)
 653 {
 654         if (!killflg)
 655                 (void)unlink(_PATH_NOLOGIN);
 656         exit(0);
 657 }
 658
 659 void
 660 badtime(void)
 661 {
 662         errx(1, "bad time format");
 663 }
 664
 665 void
 666 usage(const char *cp)
 667 {
 668         if (cp != NULL)
 669                 warnx("%s", cp);
 670         (void)fprintf(stderr,
 671 #ifdef __APPLE__
 672             "usage: shutdown [-] [-h [-u] [-n] | -r [-n] | -s | -k]"
 673 #else
 674             "usage: shutdown [-] [-h | -p | -r | -k] [-o [-n]]"
 675 #endif
 676             " time [warning-message ...]\n");
 677         exit(1);
 678 }
 679
 680 /*
 681  * The following tokens are included in the audit record for shutdown
 682  * header
 683  * subject
 684  * return
 685  */
 686 int
 687 audit_shutdown(int exitstatus)
 688 {
 689         int aufd;
 690         token_t *tok;
 691         long au_cond;
 692
 693         /* If we are not auditing, don't cut an audit record; just return */
 694         if (auditon(A_GETCOND, &au_cond, sizeof(long)) < 0) {
 695                 fprintf(stderr, "shutdown: Could not determine audit condition\n");
 696                 return 0;
 697         }
 698         if (au_cond == AUC_NOAUDIT)
 699                 return 0;
 700
 701         if((aufd = au_open()) == -1) {
 702                 fprintf(stderr, "shutdown: Audit Error: au_open() failed\n");
 703                 exit(1);
 704         }
 705
 706         /* The subject that performed the operation */
 707         if((tok = au_to_me()) == NULL) {
 708                 fprintf(stderr, "shutdown: Audit Error: au_to_me() failed\n");
 709                 exit(1);
 710         }
 711         au_write(aufd, tok);
 712
 713         /* success and failure status */
 714         if((tok = au_to_return32(exitstatus, errno)) == NULL) {
 715                 fprintf(stderr, "shutdown: Audit Error: au_to_return32() failed\n");
 716                 exit(1);
 717         }
 718         au_write(aufd, tok);
 719
 720         if(au_close(aufd, 1, AUE_shutdown) == -1) {
 721                 fprintf(stderr, "shutdown: Audit Error: au_close() failed\n");
 722                 exit(1);
 723         }
 724         return 1;
 725 }
 726
 727 #if defined(__APPLE__) && !(TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR)
 728
 729 static bool
 730 kextdDisabled(void)
 731 {
 732         uint32_t disabled = 0;
 733         size_t   sizeOfDisabled = sizeof(disabled);
 734         if (sysctlbyname("hw.use_kernelmanagerd", &disabled, &sizeOfDisabled, NULL, 0) != 0) {
 735                 return false;
 736         }
 737         return (disabled != 0);
 738 }
 739
 740
 741 // XX copied from reboot.tproj/reboot.c; it would be nice to share the code
 742
 743 #define WAITFORLOCK 1
 744 /*
 745  * contact kextd to lock for reboot
 746  */
 747 int
 748 reserve_reboot(void)
 749 {
 750     int rval = ELAST + 1;
 751     kern_return_t macherr = KERN_FAILURE;
 752     mach_port_t kxport, tport = MACH_PORT_NULL, myport = MACH_PORT_NULL;
 753     int busyStatus = ELAST + 1;
 754     mountpoint_t busyVol;
 755
 756     if (kextdDisabled()) {
 757         /* no need to talk with kextd if it's not running */
 758         return 0;
 759     }
 760
 761     macherr = bootstrap_look_up2(bootstrap_port, KEXTD_SERVER_NAME, &kxport, 0, BOOTSTRAP_PRIVILEGED_SERVER);
 762     if (macherr)  goto finish;
 763
 764     // allocate a port to pass to kextd (in case we die)
 765     tport = mach_task_self();
 766     if (tport == MACH_PORT_NULL)  goto finish;
 767     macherr = mach_port_allocate(tport, MACH_PORT_RIGHT_RECEIVE, &myport);
 768     if (macherr)  goto finish;
 769
 770     // try to lock for reboot
 771     macherr = kextmanager_lock_reboot(kxport, myport, !WAITFORLOCK, busyVol,
 772                                       &busyStatus);
 773     if (macherr)  goto finish;
 774
 775     if (busyStatus == EBUSY) {
 776         warnx("%s is busy updating; waiting for lock", busyVol);
 777         macherr = kextmanager_lock_reboot(kxport, myport, WAITFORLOCK,
 778                                           busyVol, &busyStatus);
 779         if (macherr)    goto finish;
 780     }
 781
 782     if (busyStatus == EALREADY) {
 783         // reboot already in progress
 784         rval = 0;
 785     } else {
 786         rval = busyStatus;
 787     }
 788
 789 finish:
 790     // in general, we want to err on the side of allowing the reboot
 791     if (macherr) {
 792         if (macherr != BOOTSTRAP_UNKNOWN_SERVICE)
 793             warnx("WARNING: couldn't lock kext manager for reboot: %s",
 794                     mach_error_string(macherr));
 795         rval = 0;
 796     }
 797     // unless we got the lock, clean up our port
 798     if (busyStatus != 0 && myport != MACH_PORT_NULL)
 799         mach_port_mod_refs(tport, myport, MACH_PORT_RIGHT_RECEIVE, -1);
 800
 801     return rval;
 802 }
 803 #endif /* __APPLE__ */