1 /* $NetBSD: shutdown.c,v 1.46 2006/03/07 22:19:55 jnemeth 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\n\ 35 The Regents of the University of California. All rights reserved.\n"); 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 1.46 2006/03/07 22:19:55 jnemeth 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 64 #include "pathnames.h" 65 66 #ifdef DEBUG 67 #undef _PATH_NOLOGIN 68 #define _PATH_NOLOGIN "./nologin" 69 #undef _PATH_FASTBOOT 70 #define _PATH_FASTBOOT "./fastboot" 71 #endif 72 73 #define H *60*60 74 #define M *60 75 #define S *1 76 #define NOLOG_TIME 5*60 77 struct interval { 78 int timeleft, timetowait; 79 } tlist[] = { 80 { 10 H, 5 H }, { 5 H, 3 H }, { 2 H, 1 H }, { 1 H, 30 M }, 81 { 30 M, 10 M }, { 20 M, 10 M }, { 10 M, 5 M }, { 5 M, 3 M }, 82 { 2 M, 1 M }, { 1 M, 30 S }, { 30 S, 30 S }, 83 { 0, 0 } 84 }; 85 #undef H 86 #undef M 87 #undef S 88 89 static time_t offset, shuttime; 90 static int dofast, dohalt, doreboot, killflg, mbuflen, nofork, nosync, dodump; 91 static int dopowerdown; 92 static const char *whom; 93 static char mbuf[BUFSIZ]; 94 char *bootstr; 95 96 void badtime(void); 97 void die_you_gravy_sucking_pig_dog(void); 98 void doitfast(void); 99 void dorcshutdown(void); 100 void finish(int); 101 void getoffset(char *); 102 void loop(void); 103 void nolog(void); 104 void timeout(int); 105 void timewarn(int); 106 void usage(void); 107 108 int 109 main(int argc, char *argv[]) 110 { 111 char *p, *endp; 112 struct passwd *pw; 113 int arglen, ch, len; 114 115 #ifndef DEBUG 116 if (geteuid()) 117 errx(1, "NOT super-user"); 118 #endif 119 while ((ch = getopt(argc, argv, "b:Ddfhknpr")) != -1) 120 switch (ch) { 121 case 'b': 122 bootstr = optarg; 123 break; 124 case 'd': 125 dodump = 1; 126 break; 127 case 'D': 128 nofork = 1; 129 break; 130 case 'f': 131 dofast = 1; 132 break; 133 case 'p': 134 dopowerdown = 1; 135 /* FALLTHROUGH */ 136 case 'h': 137 dohalt = 1; 138 break; 139 case 'k': 140 killflg = 1; 141 break; 142 case 'n': 143 nosync = 1; 144 break; 145 case 'r': 146 doreboot = 1; 147 break; 148 case '?': 149 default: 150 usage(); 151 } 152 argc -= optind; 153 argv += optind; 154 155 if (argc < 1) 156 usage(); 157 158 if (dodump && !dohalt && !doreboot) 159 doreboot = 1; 160 161 if (dofast && nosync) { 162 warnx("incompatible switches -f and -n"); 163 usage(); 164 } 165 if (dohalt && doreboot) { 166 const char *which_flag = dopowerdown ? "p" : "h"; 167 168 warnx("incompatible switches -%s and -r", which_flag); 169 usage(); 170 } 171 172 getoffset(*argv++); 173 174 if (argv[0]) { 175 if (strcmp(argv[0], "-") || argv[1]) { 176 for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) { 177 arglen = strlen(*argv); 178 if ((len -= arglen) <= 2) 179 break; 180 if (p != mbuf) 181 *p++ = ' '; 182 memmove(p, *argv, arglen); 183 p += arglen; 184 } 185 *p = '\n'; 186 *++p = '\0'; 187 } else { 188 p = mbuf; 189 endp = mbuf + sizeof(mbuf) - 2; 190 for (;;) { 191 if (!fgets(p, endp - p + 1, stdin)) 192 break; 193 for (; *p && p < endp; ++p); 194 if (p == endp) { 195 *p = '\n'; 196 *++p = '\0'; 197 break; 198 } 199 } 200 } 201 } 202 mbuflen = strlen(mbuf); 203 204 if (offset) 205 (void)printf("Shutdown at %.24s.\n", ctime(&shuttime)); 206 else 207 (void)printf("Shutdown NOW!\n"); 208 209 if (!(whom = getlogin())) 210 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???"; 211 212 #ifdef DEBUG 213 (void)putc('\n', stdout); 214 #else 215 (void)setpriority(PRIO_PROCESS, 0, PRIO_MIN); 216 if (nofork == 0) { 217 int forkpid; 218 219 forkpid = fork(); 220 if (forkpid == -1) { 221 perror("shutdown: fork"); 222 exit(1); 223 } 224 if (forkpid) { 225 (void)printf("shutdown: [pid %d]\n", forkpid); 226 exit(0); 227 } 228 (void)setsid(); 229 } 230 #endif 231 openlog("shutdown", LOG_CONS, LOG_AUTH); 232 loop(); 233 /* NOTREACHED */ 234 #ifdef __GNUC__ 235 return 1; 236 #endif 237 } 238 239 void 240 loop(void) 241 { 242 struct interval *tp; 243 u_int sltime; 244 int logged; 245 246 if (offset <= NOLOG_TIME) { 247 logged = 1; 248 nolog(); 249 } 250 else 251 logged = 0; 252 tp = tlist; 253 if (tp->timeleft < offset) 254 (void)sleep((u_int)(offset - tp->timeleft)); 255 else { 256 while (offset < tp->timeleft) 257 ++tp; 258 /* 259 * Warn now, if going to sleep more than a fifth of 260 * the next wait time. 261 */ 262 if ((sltime = offset - tp->timeleft) != 0) { 263 if (sltime > tp->timetowait / 5) 264 timewarn(offset); 265 (void)sleep(sltime); 266 } 267 } 268 for (;; ++tp) { 269 timewarn(tp->timeleft); 270 if (!logged && tp->timeleft <= NOLOG_TIME) { 271 logged = 1; 272 nolog(); 273 } 274 (void)sleep((u_int)tp->timetowait); 275 if (!tp->timeleft) 276 break; 277 } 278 die_you_gravy_sucking_pig_dog(); 279 } 280 281 static jmp_buf alarmbuf; 282 283 void 284 timewarn(int timeleft) 285 { 286 static int first; 287 static char hostname[MAXHOSTNAMELEN + 1]; 288 FILE *pf; 289 char wcmd[MAXPATHLEN + 4]; 290 291 if (!first++) { 292 (void)gethostname(hostname, sizeof(hostname)); 293 hostname[sizeof(hostname) - 1] = '\0'; 294 } 295 296 /* undoc -n option to wall suppresses normal wall banner */ 297 (void)snprintf(wcmd, sizeof wcmd, "%s -n", _PATH_WALL); 298 if (!(pf = popen(wcmd, "w"))) { 299 syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL); 300 return; 301 } 302 303 (void)fprintf(pf, 304 "\007*** %sSystem shutdown message from %s@%s ***\007\n", 305 timeleft ? "": "FINAL ", whom, hostname); 306 307 if (timeleft > 10*60) 308 (void)fprintf(pf, "System going down at %5.5s\n\n", 309 ctime(&shuttime) + 11); 310 else if (timeleft > 59) 311 (void)fprintf(pf, "System going down in %d minute%s\n\n", 312 timeleft / 60, (timeleft > 60) ? "s" : ""); 313 else if (timeleft) 314 (void)fprintf(pf, "System going down in 30 seconds\n\n"); 315 else 316 (void)fprintf(pf, "System going down IMMEDIATELY\n\n"); 317 318 if (mbuflen) 319 (void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf); 320 321 /* 322 * play some games, just in case wall doesn't come back 323 * probably unnecessary, given that wall is careful. 324 */ 325 if (!setjmp(alarmbuf)) { 326 (void)signal(SIGALRM, timeout); 327 (void)alarm((u_int)30); 328 (void)pclose(pf); 329 (void)alarm((u_int)0); 330 (void)signal(SIGALRM, SIG_DFL); 331 } 332 } 333 334 void 335 timeout(int signo) 336 { 337 longjmp(alarmbuf, 1); 338 } 339 340 void 341 die_you_gravy_sucking_pig_dog(void) 342 { 343 344 syslog(LOG_NOTICE, "%s by %s: %s", 345 doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf); 346 (void)sleep(2); 347 348 (void)printf("\r\nSystem shutdown time has arrived\007\007\r\n"); 349 if (killflg) { 350 (void)printf("\rbut you'll have to do it yourself\r\n"); 351 finish(0); 352 } 353 if (dofast) 354 doitfast(); 355 dorcshutdown(); 356 if (doreboot || dohalt) { 357 const char *args[16]; 358 const char **arg, *path; 359 360 arg = &args[0]; 361 if (doreboot) { 362 path = _PATH_REBOOT; 363 *arg++ = "reboot"; 364 } else { 365 path = _PATH_HALT; 366 *arg++ = "halt"; 367 } 368 if (dodump) 369 *arg++ = "-d"; 370 if (nosync) 371 *arg++ = "-n"; 372 if (dopowerdown) 373 *arg++ = "-p"; 374 *arg++ = "-l"; 375 if (bootstr) 376 *arg++ = bootstr; 377 *arg++ = 0; 378 #ifndef DEBUG 379 execve(path, __UNCONST(args), NULL); 380 syslog(LOG_ERR, "shutdown: can't exec %s: %m", path); 381 perror("shutdown"); 382 #else 383 printf("%s", path); 384 for (arg = &args[0]; *arg; arg++) 385 printf(" %s", *arg); 386 printf("\n"); 387 #endif 388 } else { 389 #ifndef DEBUG 390 (void)kill(1, SIGTERM); /* to single user */ 391 #else 392 printf("kill 1\n"); 393 #endif 394 } 395 finish(0); 396 } 397 398 #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0')) 399 400 void 401 getoffset(char *timearg) 402 { 403 struct tm *lt; 404 char *p; 405 time_t now; 406 int yearset; 407 408 (void)time(&now); 409 if (!strcasecmp(timearg, "now")) { /* now */ 410 offset = 0; 411 shuttime = now; 412 return; 413 } 414 415 if (*timearg == '+') { /* +minutes */ 416 if (!isdigit((unsigned char)*++timearg)) 417 badtime(); 418 offset = atoi(timearg) * 60; 419 shuttime = now + offset; 420 return; 421 } 422 423 /* handle hh:mm by getting rid of the colon */ 424 for (p = timearg; *p; ++p) 425 if (!isascii(*p) || !isdigit((unsigned char)*p)) { 426 if (*p == ':' && strlen(p) == 3) { 427 p[0] = p[1]; 428 p[1] = p[2]; 429 p[2] = '\0'; 430 } 431 else 432 badtime(); 433 } 434 435 unsetenv("TZ"); /* OUR timezone */ 436 lt = localtime(&now); /* current time val */ 437 438 lt->tm_sec = 0; 439 440 yearset = 0; 441 switch (strlen(timearg)) { 442 case 12: 443 lt->tm_year = ATOI2(timearg) * 100 - TM_YEAR_BASE; 444 yearset = 1; 445 /* FALLTHROUGH */ 446 case 10: 447 if (yearset) { 448 lt->tm_year += ATOI2(timearg); 449 } else { 450 yearset = ATOI2(timearg); 451 if (yearset < 69) 452 lt->tm_year = yearset + 2000 - TM_YEAR_BASE; 453 else 454 lt->tm_year = yearset + 1900 - TM_YEAR_BASE; 455 } 456 /* FALLTHROUGH */ 457 case 8: 458 lt->tm_mon = ATOI2(timearg); 459 --lt->tm_mon; 460 /* FALLTHROUGH */ 461 case 6: 462 lt->tm_mday = ATOI2(timearg); 463 /* FALLTHROUGH */ 464 case 4: 465 lt->tm_hour = ATOI2(timearg); 466 /* FALLTHROUGH */ 467 case 2: 468 lt->tm_min = ATOI2(timearg); 469 break; 470 default: 471 badtime(); 472 } 473 474 if ((shuttime = mktime(lt)) == -1) 475 badtime(); 476 if ((offset = shuttime - now) < 0) 477 errx(1, "time is already past"); 478 } 479 480 void 481 dorcshutdown(void) 482 { 483 (void)printf("\r\nAbout to run shutdown hooks...\r\n"); 484 (void)system(". " _PATH_RCSHUTDOWN); 485 (void)sleep(5); /* Give operator a chance to abort this. */ 486 (void)printf("\r\nDone running shutdown hooks.\r\n"); 487 } 488 489 #define FSMSG "fastboot file for fsck\n" 490 void 491 doitfast(void) 492 { 493 int fastfd; 494 495 if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC, 496 0664)) >= 0) { 497 (void)write(fastfd, FSMSG, sizeof(FSMSG) - 1); 498 (void)close(fastfd); 499 } 500 } 501 502 #define NOMSG "\n\nNO LOGINS: System going down at " 503 void 504 nolog(void) 505 { 506 int logfd; 507 char *ct; 508 509 (void)unlink(_PATH_NOLOGIN); /* in case linked to another file */ 510 (void)signal(SIGINT, finish); 511 (void)signal(SIGHUP, finish); 512 (void)signal(SIGQUIT, finish); 513 (void)signal(SIGTERM, finish); 514 if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC, 515 0664)) >= 0) { 516 (void)write(logfd, NOMSG, sizeof(NOMSG) - 1); 517 ct = ctime(&shuttime); 518 (void)write(logfd, ct + 11, 5); 519 (void)write(logfd, "\n\n", 2); 520 (void)write(logfd, mbuf, strlen(mbuf)); 521 (void)close(logfd); 522 } 523 } 524 525 void 526 finish(int signo) 527 { 528 529 if (!killflg) 530 (void)unlink(_PATH_NOLOGIN); 531 exit(0); 532 } 533 534 void 535 badtime(void) 536 { 537 538 warnx("illegal time format"); 539 usage(); 540 } 541 542 void 543 usage(void) 544 { 545 546 (void)fprintf(stderr, 547 "usage: shutdown [-Ddfhknpr] time [message ... | -]\n"); 548 exit(1); 549 } 550