shutdown.tproj/shutdown.c

   1 /*
   2  * Copyright (c) 1988, 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifndef lint
  35 static const char copyright[] =
  36 "@(#) Copyright (c) 1988, 1990, 1993\n\
  37         The Regents of the University of California.  All rights reserved.\n";
  38 #endif /* not lint */
  39
  40 #ifndef lint
  41 #if 0
  42 static char sccsid[] = "@(#)shutdown.c  8.4 (Berkeley) 4/28/95";
  43 #endif
  44 static const char rcsid[] =
  45   "$FreeBSD: src/sbin/shutdown/shutdown.c,v 1.23 2002/03/21 13:20:48 imp Exp $";
  46 #endif /* not lint */
  47
  48 #include <sys/param.h>
  49 #include <sys/time.h>
  50 #include <sys/resource.h>
  51 #include <sys/syslog.h>
  52
  53 #include <ctype.h>
  54 #include <err.h>
  55 #include <fcntl.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 #include "pathnames.h"
  65
  66 #ifdef __APPLE__
  67 #define __unused
  68 #endif
  69
  70 #ifdef DEBUG
  71 #undef _PATH_NOLOGIN
  72 #define _PATH_NOLOGIN   "./nologin"
  73 #endif
  74
  75 #define H               *60*60
  76 #define M               *60
  77 #define S               *1
  78 #define NOLOG_TIME      5*60
  79 struct interval {
  80         int timeleft, timetowait;
  81 } tlist[] = {
  82         { 10 H,  5 H },
  83         {  5 H,  3 H },
  84         {  2 H,  1 H },
  85         {  1 H, 30 M },
  86         { 30 M, 10 M },
  87         { 20 M, 10 M },
  88         { 10 M,  5 M },
  89         {  5 M,  3 M },
  90         {  2 M,  1 M },
  91         {  1 M, 30 S },
  92         { 30 S, 30 S },
  93         {  0  ,  0   }
  94 };
  95 #undef H
  96 #undef M
  97 #undef S
  98
  99 static time_t offset, shuttime;
 100 static int dohalt, dopower, doreboot, killflg, mbuflen, oflag = 1;
 101 static char mbuf[BUFSIZ];
 102 static const char *nosync, *whom;
 103
 104 void badtime(void);
 105 void die_you_gravy_sucking_pig_dog(void);
 106 void finish(int);
 107 void getoffset(char *);
 108 void loop(void);
 109 void nolog(void);
 110 void timeout(int);
 111 void timewarn(int);
 112 void usage(const char *);
 113
 114 int
 115 main(argc, argv)
 116         int argc;
 117         char *argv[];
 118 {
 119         char *p, *endp;
 120         struct passwd *pw;
 121         int arglen, ch, len, readstdin;
 122
 123 #ifndef DEBUG
 124         if (geteuid())
 125                 errx(1, "NOT super-user");
 126 #endif
 127         nosync = NULL;
 128         readstdin = 0;
 129 #ifndef __APPLE__
 130         while ((ch = getopt(argc, argv, "-hknopr")) != -1)
 131 #else
 132         while ((ch = getopt(argc, argv, "-hknor")) != -1)
 133 #endif
 134                 switch (ch) {
 135                 case '-':
 136                         readstdin = 1;
 137                         break;
 138                 case 'h':
 139                         dohalt = 1;
 140                         break;
 141                 case 'k':
 142                         killflg = 1;
 143                         break;
 144                 case 'n':
 145                         nosync = "-n";
 146                         break;
 147                 case 'o':
 148                         oflag = 1;
 149                         break;
 150 #ifndef __APPLE__
 151                 case 'p':
 152                         dopower = 1;
 153                         break;
 154 #endif
 155                 case 'r':
 156                         doreboot = 1;
 157                         break;
 158                 case '?':
 159                 default:
 160                         usage((char *)NULL);
 161                 }
 162         argc -= optind;
 163         argv += optind;
 164
 165         if (argc < 1)
 166                 usage((char *)NULL);
 167
 168 #ifndef __APPLE__
 169         if (killflg + doreboot + dohalt + dopower > 1)
 170                 usage("incompatible switches -h, -k, -p and -r");
 171
 172         if (oflag && !(dohalt || dopower || doreboot))
 173                 usage("-o requires -h, -p or -r");
 174 #else
 175         if (killflg + doreboot + dohalt > 1)
 176                 usage("incompatible switches -h, -k, and -r");
 177
 178         if (oflag && !(dohalt || doreboot))
 179                 usage("-o requires -h or -r");
 180 #endif
 181
 182         if (nosync != NULL && !oflag)
 183                 usage("-n requires -o");
 184
 185         getoffset(*argv++);
 186
 187         if (*argv) {
 188                 for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) {
 189                         arglen = strlen(*argv);
 190                         if ((len -= arglen) <= 2)
 191                                 break;
 192                         if (p != mbuf)
 193                                 *p++ = ' ';
 194                         memmove(p, *argv, arglen);
 195                         p += arglen;
 196                 }
 197                 *p = '\n';
 198                 *++p = '\0';
 199         }
 200
 201         if (readstdin) {
 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         mbuflen = strlen(mbuf);
 216
 217         if (offset)
 218                 (void)printf("Shutdown at %.24s.\n", ctime(&shuttime));
 219         else
 220                 (void)printf("Shutdown NOW!\n");
 221
 222         if (!(whom = getlogin()))
 223                 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???";
 224
 225 #ifdef DEBUG
 226         (void)putc('\n', stdout);
 227 #else
 228         (void)setpriority(PRIO_PROCESS, 0, PRIO_MIN);
 229         {
 230                 int forkpid;
 231
 232                 forkpid = fork();
 233                 if (forkpid == -1)
 234                         err(1, "fork");
 235                 if (forkpid)
 236                         errx(0, "[pid %d]", forkpid);
 237         }
 238         setsid();
 239 #endif
 240         openlog("shutdown", LOG_CONS, LOG_AUTH);
 241         loop();
 242         return(0);
 243 }
 244
 245 void
 246 loop()
 247 {
 248         struct interval *tp;
 249         u_int sltime;
 250         int logged;
 251
 252         if (offset <= NOLOG_TIME) {
 253                 logged = 1;
 254                 nolog();
 255         }
 256         else
 257                 logged = 0;
 258         tp = tlist;
 259         if (tp->timeleft < offset)
 260                 (void)sleep((u_int)(offset - tp->timeleft));
 261         else {
 262                 while (tp->timeleft && offset < tp->timeleft)
 263                         ++tp;
 264                 /*
 265                  * Warn now, if going to sleep more than a fifth of
 266                  * the next wait time.
 267                  */
 268                 if ((sltime = offset - tp->timeleft)) {
 269                         if (sltime > (u_int)(tp->timetowait / 5))
 270                                 timewarn(offset);
 271                         (void)sleep(sltime);
 272                 }
 273         }
 274         for (;; ++tp) {
 275                 timewarn(tp->timeleft);
 276                 if (!logged && tp->timeleft <= NOLOG_TIME) {
 277                         logged = 1;
 278                         nolog();
 279                 }
 280                 (void)sleep((u_int)tp->timetowait);
 281                 if (!tp->timeleft)
 282                         break;
 283         }
 284         die_you_gravy_sucking_pig_dog();
 285 }
 286
 287 static jmp_buf alarmbuf;
 288
 289 static const char *restricted_environ[] = {
 290         "PATH=" _PATH_STDPATH,
 291         NULL
 292 };
 293
 294 void
 295 timewarn(timeleft)
 296         int timeleft;
 297 {
 298         static int first;
 299         static char hostname[MAXHOSTNAMELEN + 1];
 300         FILE *pf;
 301         char wcmd[MAXPATHLEN + 4];
 302         extern const char **environ;
 303
 304         if (!first++)
 305                 (void)gethostname(hostname, sizeof(hostname));
 306
 307         /* undoc -n option to wall suppresses normal wall banner */
 308         (void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL);
 309         environ = restricted_environ;
 310         if (!(pf = popen(wcmd, "w"))) {
 311                 syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL);
 312                 return;
 313         }
 314
 315         (void)fprintf(pf,
 316             "\007*** %sSystem shutdown message from %s@%s ***\007\n",
 317             timeleft ? "": "FINAL ", whom, hostname);
 318
 319         if (timeleft > 10*60)
 320                 (void)fprintf(pf, "System going down at %5.5s\n\n",
 321                     ctime(&shuttime) + 11);
 322         else if (timeleft > 59)
 323                 (void)fprintf(pf, "System going down in %d minute%s\n\n",
 324                     timeleft / 60, (timeleft > 60) ? "s" : "");
 325         else if (timeleft)
 326                 (void)fprintf(pf, "System going down in 30 seconds\n\n");
 327         else
 328                 (void)fprintf(pf, "System going down IMMEDIATELY\n\n");
 329
 330         if (mbuflen)
 331                 (void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf);
 332
 333         /*
 334          * play some games, just in case wall doesn't come back
 335          * probably unnecessary, given that wall is careful.
 336          */
 337         if (!setjmp(alarmbuf)) {
 338                 (void)signal(SIGALRM, timeout);
 339                 (void)alarm((u_int)30);
 340                 (void)pclose(pf);
 341                 (void)alarm((u_int)0);
 342                 (void)signal(SIGALRM, SIG_DFL);
 343         }
 344 }
 345
 346 void
 347 timeout(signo)
 348         int signo __unused;
 349 {
 350         longjmp(alarmbuf, 1);
 351 }
 352
 353 void
 354 die_you_gravy_sucking_pig_dog()
 355 {
 356         char *empty_environ[] = { NULL };
 357
 358         syslog(LOG_NOTICE, "%s by %s: %s",
 359 #ifndef __APPLE__
 360             doreboot ? "reboot" : dohalt ? "halt" : dopower ? "power-down" :
 361 #else
 362             doreboot ? "reboot" : dohalt ? "halt" :
 363 #endif
 364             "shutdown", whom, mbuf);
 365         (void)sleep(2);
 366
 367         (void)printf("\r\nSystem shutdown time has arrived\007\007\r\n");
 368         if (killflg) {
 369                 (void)printf("\rbut you'll have to do it yourself\r\n");
 370                 exit(0);
 371         }
 372 #ifdef DEBUG
 373         if (doreboot)
 374                 (void)printf("reboot");
 375         else if (dohalt)
 376                 (void)printf("halt");
 377 #ifndef __APPLE__
 378         else if (dopower)
 379                 (void)printf("power-down");
 380 #endif
 381         if (nosync != NULL)
 382                 (void)printf(" no sync");
 383         (void)printf("\nkill -HUP 1\n");
 384 #else
 385         if (!oflag) {
 386                 (void)kill(1, doreboot ? SIGINT :       /* reboot */
 387                               dohalt ? SIGUSR1 :        /* halt */
 388 #ifndef __APPLE__
 389                               dopower ? SIGUSR2 :       /* power-down */
 390 #endif
 391                               SIGTERM);                 /* single-user */
 392         } else {
 393                 if (doreboot) {
 394                         execle(_PATH_REBOOT, "reboot", "-l", nosync,
 395                                 (char *)NULL, empty_environ);
 396                         syslog(LOG_ERR, "shutdown: can't exec %s: %m.",
 397                                 _PATH_REBOOT);
 398                         warn(_PATH_REBOOT);
 399                 }
 400                 else if (dohalt) {
 401                         execle(_PATH_HALT, "halt", "-l", nosync,
 402                                 (char *)NULL, empty_environ);
 403                         syslog(LOG_ERR, "shutdown: can't exec %s: %m.",
 404                                 _PATH_HALT);
 405                         warn(_PATH_HALT);
 406                 }
 407 #ifndef __APPLE__
 408                 else if (dopower) {
 409                         execle(_PATH_HALT, "halt", "-l", "-p", nosync,
 410                                 (char *)NULL, empty_environ);
 411                         syslog(LOG_ERR, "shutdown: can't exec %s: %m.",
 412                                 _PATH_HALT);
 413                         warn(_PATH_HALT);
 414                 }
 415 #endif
 416                 (void)kill(1, SIGTERM);         /* to single-user */
 417         }
 418 #endif
 419         finish(0);
 420 }
 421
 422 #define ATOI2(p)        (p[0] - '0') * 10 + (p[1] - '0'); p += 2;
 423
 424 void
 425 getoffset(timearg)
 426         char *timearg;
 427 {
 428         struct tm *lt;
 429         char *p;
 430         time_t now;
 431         int this_year;
 432
 433         (void)time(&now);
 434
 435         if (!strcasecmp(timearg, "now")) {              /* now */
 436                 offset = 0;
 437                 shuttime = now;
 438                 return;
 439         }
 440
 441         if (*timearg == '+') {                          /* +minutes */
 442                 if (!isdigit(*++timearg))
 443                         badtime();
 444                 if ((offset = atoi(timearg) * 60) < 0)
 445                         badtime();
 446                 shuttime = now + offset;
 447                 return;
 448         }
 449
 450         /* handle hh:mm by getting rid of the colon */
 451         for (p = timearg; *p; ++p)
 452                 if (!isascii(*p) || !isdigit(*p)) {
 453                         if (*p == ':' && strlen(p) == 3) {
 454                                 p[0] = p[1];
 455                                 p[1] = p[2];
 456                                 p[2] = '\0';
 457                         }
 458                         else
 459                                 badtime();
 460                 }
 461
 462         unsetenv("TZ");                                 /* OUR timezone */
 463         lt = localtime(&now);                           /* current time val */
 464
 465         switch(strlen(timearg)) {
 466         case 10:
 467                 this_year = lt->tm_year;
 468                 lt->tm_year = ATOI2(timearg);
 469                 /*
 470                  * check if the specified year is in the next century.
 471                  * allow for one year of user error as many people will
 472                  * enter n - 1 at the start of year n.
 473                  */
 474                 if (lt->tm_year < (this_year % 100) - 1)
 475                         lt->tm_year += 100;
 476                 /* adjust for the year 2000 and beyond */
 477                 lt->tm_year += (this_year - (this_year % 100));
 478                 /* FALLTHROUGH */
 479         case 8:
 480                 lt->tm_mon = ATOI2(timearg);
 481                 if (--lt->tm_mon < 0 || lt->tm_mon > 11)
 482                         badtime();
 483                 /* FALLTHROUGH */
 484         case 6:
 485                 lt->tm_mday = ATOI2(timearg);
 486                 if (lt->tm_mday < 1 || lt->tm_mday > 31)
 487                         badtime();
 488                 /* FALLTHROUGH */
 489         case 4:
 490                 lt->tm_hour = ATOI2(timearg);
 491                 if (lt->tm_hour < 0 || lt->tm_hour > 23)
 492                         badtime();
 493                 lt->tm_min = ATOI2(timearg);
 494                 if (lt->tm_min < 0 || lt->tm_min > 59)
 495                         badtime();
 496                 lt->tm_sec = 0;
 497                 if ((shuttime = mktime(lt)) == -1)
 498                         badtime();
 499                 if ((offset = shuttime - now) < 0)
 500                         errx(1, "that time is already past.");
 501                 break;
 502         default:
 503                 badtime();
 504         }
 505 }
 506
 507 #define NOMSG   "\n\nNO LOGINS: System going down at "
 508 void
 509 nolog()
 510 {
 511 #ifndef __APPLE__
 512         int logfd;
 513         char *ct;
 514
 515         (void)unlink(_PATH_NOLOGIN);    /* in case linked to another file */
 516         (void)signal(SIGINT, finish);
 517         (void)signal(SIGHUP, finish);
 518         (void)signal(SIGQUIT, finish);
 519         (void)signal(SIGTERM, finish);
 520         if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC,
 521             0664)) >= 0) {
 522                 (void)write(logfd, NOMSG, sizeof(NOMSG) - 1);
 523                 ct = ctime(&shuttime);
 524                 (void)write(logfd, ct + 11, 5);
 525                 (void)write(logfd, "\n\n", 2);
 526                 (void)write(logfd, mbuf, strlen(mbuf));
 527                 (void)close(logfd);
 528         }
 529 #endif
 530 }
 531
 532 void
 533 finish(signo)
 534         int signo __unused;
 535 {
 536 #ifndef __APPLE__
 537         if (!killflg)
 538                 (void)unlink(_PATH_NOLOGIN);
 539 #endif
 540         exit(0);
 541 }
 542
 543 void
 544 badtime()
 545 {
 546         errx(1, "bad time format");
 547 }
 548
 549 void
 550 usage(cp)
 551         const char *cp;
 552 {
 553         if (cp != NULL)
 554                 warnx("%s", cp);
 555         (void)fprintf(stderr,
 556             "usage: shutdown [-] [-h | -p | -r | -k] [-o [-n]]"
 557             " time [warning-message ...]\n");
 558         exit(1);
 559 }