1 /* $NetBSD: shutdown.c,v 1.42 2004/11/05 22:46:31 dsl 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 1.42 2004/11/05 22:46:31 dsl 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 __P((void)); 97 void die_you_gravy_sucking_pig_dog __P((void)); 98 void doitfast __P((void)); 99 void dorcshutdown __P((void)); 100 void finish __P((int)); 101 void getoffset __P((char *)); 102 void loop __P((void)); 103 int main __P((int, char *[])); 104 void nolog __P((void)); 105 void timeout __P((int)); 106 void timewarn __P((int)); 107 void usage __P((void)); 108 109 int 110 main(argc, argv) 111 int argc; 112 char *argv[]; 113 { 114 char *p, *endp; 115 struct passwd *pw; 116 int arglen, ch, len; 117 118 #ifndef DEBUG 119 if (geteuid()) 120 errx(1, "NOT super-user"); 121 #endif 122 while ((ch = getopt(argc, argv, "b:Ddfhknpr")) != -1) 123 switch (ch) { 124 case 'b': 125 bootstr = optarg; 126 break; 127 case 'd': 128 dodump = 1; 129 break; 130 case 'D': 131 nofork = 1; 132 break; 133 case 'f': 134 dofast = 1; 135 break; 136 case 'p': 137 dopowerdown = 1; 138 /* FALLTHROUGH */ 139 case 'h': 140 dohalt = 1; 141 break; 142 case 'k': 143 killflg = 1; 144 break; 145 case 'n': 146 nosync = 1; 147 break; 148 case 'r': 149 doreboot = 1; 150 break; 151 case '?': 152 default: 153 usage(); 154 } 155 argc -= optind; 156 argv += optind; 157 158 if (argc < 1) 159 usage(); 160 161 if (dodump && !dohalt && !doreboot) 162 doreboot = 1; 163 164 if (dofast && nosync) { 165 warnx("incompatible switches -f and -n"); 166 usage(); 167 } 168 if (dohalt && doreboot) { 169 const char *which_flag = dopowerdown ? "p" : "h"; 170 171 warnx("incompatible switches -%s and -r", which_flag); 172 usage(); 173 } 174 175 getoffset(*argv++); 176 177 if (argv[0]) { 178 if (strcmp(argv[0], "-") || argv[1]) { 179 for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) { 180 arglen = strlen(*argv); 181 if ((len -= arglen) <= 2) 182 break; 183 if (p != mbuf) 184 *p++ = ' '; 185 memmove(p, *argv, arglen); 186 p += arglen; 187 } 188 *p = '\n'; 189 *++p = '\0'; 190 } else { 191 p = mbuf; 192 endp = mbuf + sizeof(mbuf) - 2; 193 for (;;) { 194 if (!fgets(p, endp - p + 1, stdin)) 195 break; 196 for (; *p && p < endp; ++p); 197 if (p == endp) { 198 *p = '\n'; 199 *++p = '\0'; 200 break; 201 } 202 } 203 } 204 } 205 mbuflen = strlen(mbuf); 206 207 if (offset) 208 (void)printf("Shutdown at %.24s.\n", ctime(&shuttime)); 209 else 210 (void)printf("Shutdown NOW!\n"); 211 212 if (!(whom = getlogin())) 213 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???"; 214 215 #ifdef DEBUG 216 (void)putc('\n', stdout); 217 #else 218 (void)setpriority(PRIO_PROCESS, 0, PRIO_MIN); 219 if (nofork == 0) { 220 int forkpid; 221 222 forkpid = fork(); 223 if (forkpid == -1) { 224 perror("shutdown: fork"); 225 exit(1); 226 } 227 if (forkpid) { 228 (void)printf("shutdown: [pid %d]\n", forkpid); 229 exit(0); 230 } 231 } 232 #endif 233 openlog("shutdown", LOG_CONS, LOG_AUTH); 234 loop(); 235 /* NOTREACHED */ 236 #ifdef __GNUC__ 237 return 1; 238 #endif 239 } 240 241 void 242 loop() 243 { 244 struct interval *tp; 245 u_int sltime; 246 int logged; 247 248 if (offset <= NOLOG_TIME) { 249 logged = 1; 250 nolog(); 251 } 252 else 253 logged = 0; 254 tp = tlist; 255 if (tp->timeleft < offset) 256 (void)sleep((u_int)(offset - tp->timeleft)); 257 else { 258 while (offset < tp->timeleft) 259 ++tp; 260 /* 261 * Warn now, if going to sleep more than a fifth of 262 * the next wait time. 263 */ 264 if ((sltime = offset - tp->timeleft) != 0) { 265 if (sltime > tp->timetowait / 5) 266 timewarn(offset); 267 (void)sleep(sltime); 268 } 269 } 270 for (;; ++tp) { 271 timewarn(tp->timeleft); 272 if (!logged && tp->timeleft <= NOLOG_TIME) { 273 logged = 1; 274 nolog(); 275 } 276 (void)sleep((u_int)tp->timetowait); 277 if (!tp->timeleft) 278 break; 279 } 280 die_you_gravy_sucking_pig_dog(); 281 } 282 283 static jmp_buf alarmbuf; 284 285 void 286 timewarn(timeleft) 287 int timeleft; 288 { 289 static int first; 290 static char hostname[MAXHOSTNAMELEN + 1]; 291 FILE *pf; 292 char wcmd[MAXPATHLEN + 4]; 293 294 if (!first++) { 295 (void)gethostname(hostname, sizeof(hostname)); 296 hostname[sizeof(hostname) - 1] = '\0'; 297 } 298 299 /* undoc -n option to wall suppresses normal wall banner */ 300 (void)snprintf(wcmd, sizeof wcmd, "%s -n", _PATH_WALL); 301 if (!(pf = popen(wcmd, "w"))) { 302 syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL); 303 return; 304 } 305 306 (void)fprintf(pf, 307 "\007*** %sSystem shutdown message from %s@%s ***\007\n", 308 timeleft ? "": "FINAL ", whom, hostname); 309 310 if (timeleft > 10*60) 311 (void)fprintf(pf, "System going down at %5.5s\n\n", 312 ctime(&shuttime) + 11); 313 else if (timeleft > 59) 314 (void)fprintf(pf, "System going down in %d minute%s\n\n", 315 timeleft / 60, (timeleft > 60) ? "s" : ""); 316 else if (timeleft) 317 (void)fprintf(pf, "System going down in 30 seconds\n\n"); 318 else 319 (void)fprintf(pf, "System going down IMMEDIATELY\n\n"); 320 321 if (mbuflen) 322 (void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf); 323 324 /* 325 * play some games, just in case wall doesn't come back 326 * probably unnecessary, given that wall is careful. 327 */ 328 if (!setjmp(alarmbuf)) { 329 (void)signal(SIGALRM, timeout); 330 (void)alarm((u_int)30); 331 (void)pclose(pf); 332 (void)alarm((u_int)0); 333 (void)signal(SIGALRM, SIG_DFL); 334 } 335 } 336 337 void 338 timeout(signo) 339 int signo; 340 { 341 longjmp(alarmbuf, 1); 342 } 343 344 void 345 die_you_gravy_sucking_pig_dog() 346 { 347 348 syslog(LOG_NOTICE, "%s by %s: %s", 349 doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf); 350 (void)sleep(2); 351 352 (void)printf("\r\nSystem shutdown time has arrived\007\007\r\n"); 353 if (killflg) { 354 (void)printf("\rbut you'll have to do it yourself\r\n"); 355 finish(0); 356 } 357 if (dofast) 358 doitfast(); 359 dorcshutdown(); 360 if (doreboot || dohalt) { 361 char *args[16], **arg, *path; 362 363 arg = &args[0]; 364 if (doreboot) { 365 path = _PATH_REBOOT; 366 *arg++ = "reboot"; 367 } else { 368 path = _PATH_HALT; 369 *arg++ = "halt"; 370 } 371 if (dodump) 372 *arg++ = "-d"; 373 if (nosync) 374 *arg++ = "-n"; 375 if (dopowerdown) 376 *arg++ = "-p"; 377 *arg++ = "-l"; 378 if (bootstr) 379 *arg++ = bootstr; 380 *arg++ = 0; 381 #ifndef DEBUG 382 execve(path, args, (char **)0); 383 syslog(LOG_ERR, "shutdown: can't exec %s: %m", path); 384 perror("shutdown"); 385 #else 386 printf("%s", path); 387 for (arg = &args[0]; *arg; arg++) 388 printf(" %s", *arg); 389 printf("\n"); 390 #endif 391 } else { 392 #ifndef DEBUG 393 (void)kill(1, SIGTERM); /* to single user */ 394 #else 395 printf("kill 1\n"); 396 #endif 397 } 398 finish(0); 399 } 400 401 #define ATOI2(s) ((s) += 2, ((s)[-2] - '0') * 10 + ((s)[-1] - '0')) 402 403 void 404 getoffset(timearg) 405 char *timearg; 406 { 407 struct tm *lt; 408 char *p; 409 time_t now; 410 int yearset; 411 412 (void)time(&now); 413 if (!strcasecmp(timearg, "now")) { /* now */ 414 offset = 0; 415 shuttime = now; 416 return; 417 } 418 419 if (*timearg == '+') { /* +minutes */ 420 if (!isdigit((unsigned char)*++timearg)) 421 badtime(); 422 offset = atoi(timearg) * 60; 423 shuttime = now + offset; 424 return; 425 } 426 427 /* handle hh:mm by getting rid of the colon */ 428 for (p = timearg; *p; ++p) 429 if (!isascii(*p) || !isdigit((unsigned char)*p)) { 430 if (*p == ':' && strlen(p) == 3) { 431 p[0] = p[1]; 432 p[1] = p[2]; 433 p[2] = '\0'; 434 } 435 else 436 badtime(); 437 } 438 439 unsetenv("TZ"); /* OUR timezone */ 440 lt = localtime(&now); /* current time val */ 441 442 lt->tm_sec = 0; 443 444 yearset = 0; 445 switch (strlen(timearg)) { 446 case 12: 447 lt->tm_year = ATOI2(timearg) * 100 - TM_YEAR_BASE; 448 yearset = 1; 449 /* FALLTHROUGH */ 450 case 10: 451 if (yearset) { 452 lt->tm_year += ATOI2(timearg); 453 } else { 454 yearset = ATOI2(timearg); 455 if (yearset < 69) 456 lt->tm_year = yearset + 2000 - TM_YEAR_BASE; 457 else 458 lt->tm_year = yearset + 1900 - TM_YEAR_BASE; 459 } 460 /* FALLTHROUGH */ 461 case 8: 462 lt->tm_mon = ATOI2(timearg); 463 --lt->tm_mon; 464 /* FALLTHROUGH */ 465 case 6: 466 lt->tm_mday = ATOI2(timearg); 467 /* FALLTHROUGH */ 468 case 4: 469 lt->tm_hour = ATOI2(timearg); 470 /* FALLTHROUGH */ 471 case 2: 472 lt->tm_min = ATOI2(timearg); 473 break; 474 default: 475 badtime(); 476 } 477 478 if ((shuttime = mktime(lt)) == -1) 479 badtime(); 480 if ((offset = shuttime - now) < 0) 481 errx(1, "time is already past"); 482 } 483 484 void 485 dorcshutdown() 486 { 487 (void)printf("\r\nAbout to run shutdown hooks...\r\n"); 488 (void)system(". " _PATH_RCSHUTDOWN); 489 (void)sleep(5); /* Give operator a chance to abort this. */ 490 (void)printf("\r\nDone running shutdown hooks.\r\n"); 491 } 492 493 #define FSMSG "fastboot file for fsck\n" 494 void 495 doitfast() 496 { 497 int fastfd; 498 499 if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC, 500 0664)) >= 0) { 501 (void)write(fastfd, FSMSG, sizeof(FSMSG) - 1); 502 (void)close(fastfd); 503 } 504 } 505 506 #define NOMSG "\n\nNO LOGINS: System going down at " 507 void 508 nolog() 509 { 510 int logfd; 511 char *ct; 512 513 (void)unlink(_PATH_NOLOGIN); /* in case linked to another file */ 514 (void)signal(SIGINT, finish); 515 (void)signal(SIGHUP, finish); 516 (void)signal(SIGQUIT, finish); 517 (void)signal(SIGTERM, finish); 518 if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC, 519 0664)) >= 0) { 520 (void)write(logfd, NOMSG, sizeof(NOMSG) - 1); 521 ct = ctime(&shuttime); 522 (void)write(logfd, ct + 11, 5); 523 (void)write(logfd, "\n\n", 2); 524 (void)write(logfd, mbuf, strlen(mbuf)); 525 (void)close(logfd); 526 } 527 } 528 529 void 530 finish(signo) 531 int signo; 532 { 533 534 if (!killflg) 535 (void)unlink(_PATH_NOLOGIN); 536 exit(0); 537 } 538 539 void 540 badtime() 541 { 542 543 warnx("illegal time format"); 544 usage(); 545 } 546 547 void 548 usage() 549 { 550 551 (void)fprintf(stderr, 552 "usage: shutdown [-Ddfhknpr] time [message ... | -]\n"); 553 exit(1); 554 } 555