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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #if 0 31 #ifndef lint 32 static const char copyright[] = 33 "@(#) Copyright (c) 1988, 1990, 1993\n\ 34 The Regents of the University of California. All rights reserved.\n"; 35 #endif /* not lint */ 36 37 #ifndef lint 38 static char sccsid[] = "@(#)shutdown.c 8.4 (Berkeley) 4/28/95"; 39 #endif /* not lint */ 40 #endif 41 #include <sys/cdefs.h> 42 __FBSDID("$FreeBSD$"); 43 44 #include <sys/param.h> 45 #include <sys/time.h> 46 #include <sys/resource.h> 47 #include <sys/syslog.h> 48 49 #include <ctype.h> 50 #include <err.h> 51 #include <fcntl.h> 52 #include <paths.h> 53 #include <pwd.h> 54 #include <setjmp.h> 55 #include <signal.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <unistd.h> 60 61 #ifdef DEBUG 62 #undef _PATH_NOLOGIN 63 #define _PATH_NOLOGIN "./nologin" 64 #endif 65 66 #define H *60*60 67 #define M *60 68 #define S *1 69 #define NOLOG_TIME 5*60 70 static struct interval { 71 int timeleft, timetowait; 72 } tlist[] = { 73 { 10 H, 5 H }, 74 { 5 H, 3 H }, 75 { 2 H, 1 H }, 76 { 1 H, 30 M }, 77 { 30 M, 10 M }, 78 { 20 M, 10 M }, 79 { 10 M, 5 M }, 80 { 5 M, 3 M }, 81 { 2 M, 1 M }, 82 { 1 M, 30 S }, 83 { 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 dohalt, dopower, doreboot, killflg, mbuflen, oflag; 92 static char mbuf[BUFSIZ]; 93 static const char *nosync, *whom; 94 95 static void badtime(void); 96 static void perform_shutdown(void); 97 static void finish(int); 98 static void getoffset(char *); 99 static void loop(void); 100 static void nolog(void); 101 static void timeout(int); 102 static void timewarn(int); 103 static void usage(const char *); 104 105 extern const char **environ; 106 107 int 108 main(int argc, char **argv) 109 { 110 char *p, *endp; 111 struct passwd *pw; 112 int arglen, ch, len, readstdin; 113 114 #ifndef DEBUG 115 if (geteuid()) 116 errx(1, "NOT super-user"); 117 #endif 118 119 nosync = NULL; 120 readstdin = 0; 121 122 /* 123 * Test for the special case where the utility is called as 124 * "poweroff", for which it runs 'shutdown -p now'. 125 */ 126 if ((p = strrchr(argv[0], '/')) == NULL) 127 p = argv[0]; 128 else 129 ++p; 130 if (strcmp(p, "poweroff") == 0) { 131 if (getopt(argc, argv, "") != -1) 132 usage((char *)NULL); 133 argc -= optind; 134 argv += optind; 135 if (argc != 0) 136 usage((char *)NULL); 137 dopower = 1; 138 offset = 0; 139 (void)time(&shuttime); 140 goto poweroff; 141 } 142 143 while ((ch = getopt(argc, argv, "-hknopr")) != -1) 144 switch (ch) { 145 case '-': 146 readstdin = 1; 147 break; 148 case 'h': 149 dohalt = 1; 150 break; 151 case 'k': 152 killflg = 1; 153 break; 154 case 'n': 155 nosync = "-n"; 156 break; 157 case 'o': 158 oflag = 1; 159 break; 160 case 'p': 161 dopower = 1; 162 break; 163 case 'r': 164 doreboot = 1; 165 break; 166 case '?': 167 default: 168 usage((char *)NULL); 169 } 170 argc -= optind; 171 argv += optind; 172 173 if (argc < 1) 174 usage((char *)NULL); 175 176 if (killflg + doreboot + dohalt + dopower > 1) 177 usage("incompatible switches -h, -k, -p and -r"); 178 179 if (oflag && !(dohalt || dopower || doreboot)) 180 usage("-o requires -h, -p or -r"); 181 182 if (nosync != NULL && !oflag) 183 usage("-n requires -o"); 184 185 getoffset(*argv++); 186 187 poweroff: 188 if (*argv) { 189 for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) { 190 arglen = strlen(*argv); 191 if ((len -= arglen) <= 2) 192 break; 193 if (p != mbuf) 194 *p++ = ' '; 195 memmove(p, *argv, arglen); 196 p += arglen; 197 } 198 *p = '\n'; 199 *++p = '\0'; 200 } 201 202 if (readstdin) { 203 p = mbuf; 204 endp = mbuf + sizeof(mbuf) - 2; 205 for (;;) { 206 if (!fgets(p, endp - p + 1, stdin)) 207 break; 208 for (; *p && p < endp; ++p); 209 if (p == endp) { 210 *p = '\n'; 211 *++p = '\0'; 212 break; 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 { 231 int forkpid; 232 233 forkpid = fork(); 234 if (forkpid == -1) 235 err(1, "fork"); 236 if (forkpid) 237 errx(0, "[pid %d]", forkpid); 238 } 239 setsid(); 240 #endif 241 openlog("shutdown", LOG_CONS, LOG_AUTH); 242 loop(); 243 return(0); 244 } 245 246 static void 247 loop(void) 248 { 249 struct interval *tp; 250 u_int sltime; 251 int logged; 252 253 if (offset <= NOLOG_TIME) { 254 logged = 1; 255 nolog(); 256 } 257 else 258 logged = 0; 259 tp = tlist; 260 if (tp->timeleft < offset) 261 (void)sleep((u_int)(offset - tp->timeleft)); 262 else { 263 while (tp->timeleft && offset < tp->timeleft) 264 ++tp; 265 /* 266 * Warn now, if going to sleep more than a fifth of 267 * the next wait time. 268 */ 269 if ((sltime = offset - tp->timeleft)) { 270 if (sltime > (u_int)(tp->timetowait / 5)) 271 timewarn(offset); 272 (void)sleep(sltime); 273 } 274 } 275 for (;; ++tp) { 276 timewarn(tp->timeleft); 277 if (!logged && tp->timeleft <= NOLOG_TIME) { 278 logged = 1; 279 nolog(); 280 } 281 (void)sleep((u_int)tp->timetowait); 282 if (!tp->timeleft) 283 break; 284 } 285 perform_shutdown(); 286 } 287 288 static jmp_buf alarmbuf; 289 290 static const char *restricted_environ[] = { 291 "PATH=" _PATH_STDPATH, 292 NULL 293 }; 294 295 static void 296 timewarn(int timeleft) 297 { 298 static int first; 299 static char hostname[MAXHOSTNAMELEN + 1]; 300 FILE *pf; 301 char wcmd[MAXPATHLEN + 4]; 302 303 if (!first++) 304 (void)gethostname(hostname, sizeof(hostname)); 305 306 /* undoc -n option to wall suppresses normal wall banner */ 307 (void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL); 308 environ = restricted_environ; 309 if (!(pf = popen(wcmd, "w"))) { 310 syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL); 311 return; 312 } 313 314 (void)fprintf(pf, 315 "\007*** %sSystem shutdown message from %s@%s ***\007\n", 316 timeleft ? "": "FINAL ", whom, hostname); 317 318 if (timeleft > 10*60) 319 (void)fprintf(pf, "System going down at %5.5s\n\n", 320 ctime(&shuttime) + 11); 321 else if (timeleft > 59) 322 (void)fprintf(pf, "System going down in %d minute%s\n\n", 323 timeleft / 60, (timeleft > 60) ? "s" : ""); 324 else if (timeleft) 325 (void)fprintf(pf, "System going down in 30 seconds\n\n"); 326 else 327 (void)fprintf(pf, "System going down IMMEDIATELY\n\n"); 328 329 if (mbuflen) 330 (void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf); 331 332 /* 333 * play some games, just in case wall doesn't come back 334 * probably unnecessary, given that wall is careful. 335 */ 336 if (!setjmp(alarmbuf)) { 337 (void)signal(SIGALRM, timeout); 338 (void)alarm((u_int)30); 339 (void)pclose(pf); 340 (void)alarm((u_int)0); 341 (void)signal(SIGALRM, SIG_DFL); 342 } 343 } 344 345 static void 346 timeout(int signo __unused) 347 { 348 longjmp(alarmbuf, 1); 349 } 350 351 static void 352 perform_shutdown(void) 353 { 354 char *empty_environ[] = { NULL }; 355 356 syslog(LOG_NOTICE, "%s by %s: %s", 357 doreboot ? "reboot" : dohalt ? "halt" : dopower ? "power-down" : 358 "shutdown", whom, mbuf); 359 (void)sleep(2); 360 361 (void)printf("\r\nSystem shutdown time has arrived\007\007\r\n"); 362 if (killflg) { 363 (void)printf("\rbut you'll have to do it yourself\r\n"); 364 exit(0); 365 } 366 #ifdef DEBUG 367 if (doreboot) 368 (void)printf("reboot"); 369 else if (dohalt) 370 (void)printf("halt"); 371 else if (dopower) 372 (void)printf("power-down"); 373 if (nosync != NULL) 374 (void)printf(" no sync"); 375 (void)printf("\nkill -HUP 1\n"); 376 #else 377 if (!oflag) { 378 (void)kill(1, doreboot ? SIGINT : /* reboot */ 379 dohalt ? SIGUSR1 : /* halt */ 380 dopower ? SIGUSR2 : /* power-down */ 381 SIGTERM); /* single-user */ 382 } else { 383 if (doreboot) { 384 execle(_PATH_REBOOT, "reboot", "-l", nosync, 385 (char *)NULL, empty_environ); 386 syslog(LOG_ERR, "shutdown: can't exec %s: %m.", 387 _PATH_REBOOT); 388 warn(_PATH_REBOOT); 389 } 390 else if (dohalt) { 391 execle(_PATH_HALT, "halt", "-l", nosync, 392 (char *)NULL, empty_environ); 393 syslog(LOG_ERR, "shutdown: can't exec %s: %m.", 394 _PATH_HALT); 395 warn(_PATH_HALT); 396 } 397 else if (dopower) { 398 execle(_PATH_HALT, "halt", "-l", "-p", nosync, 399 (char *)NULL, empty_environ); 400 syslog(LOG_ERR, "shutdown: can't exec %s: %m.", 401 _PATH_HALT); 402 warn(_PATH_HALT); 403 } 404 (void)kill(1, SIGTERM); /* to single-user */ 405 } 406 #endif 407 finish(0); 408 } 409 410 #define ATOI2(p) (p[0] - '0') * 10 + (p[1] - '0'); p += 2; 411 412 static void 413 getoffset(char *timearg) 414 { 415 struct tm *lt; 416 char *p; 417 time_t now; 418 int this_year; 419 420 (void)time(&now); 421 422 if (!strcasecmp(timearg, "now")) { /* now */ 423 offset = 0; 424 shuttime = now; 425 return; 426 } 427 428 if (*timearg == '+') { /* +minutes */ 429 if (!isdigit(*++timearg)) 430 badtime(); 431 if ((offset = atoi(timearg) * 60) < 0) 432 badtime(); 433 shuttime = now + offset; 434 return; 435 } 436 437 /* handle hh:mm by getting rid of the colon */ 438 for (p = timearg; *p; ++p) 439 if (!isascii(*p) || !isdigit(*p)) { 440 if (*p == ':' && strlen(p) == 3) { 441 p[0] = p[1]; 442 p[1] = p[2]; 443 p[2] = '\0'; 444 } 445 else 446 badtime(); 447 } 448 449 unsetenv("TZ"); /* OUR timezone */ 450 lt = localtime(&now); /* current time val */ 451 452 switch(strlen(timearg)) { 453 case 10: 454 this_year = lt->tm_year; 455 lt->tm_year = ATOI2(timearg); 456 /* 457 * check if the specified year is in the next century. 458 * allow for one year of user error as many people will 459 * enter n - 1 at the start of year n. 460 */ 461 if (lt->tm_year < (this_year % 100) - 1) 462 lt->tm_year += 100; 463 /* adjust for the year 2000 and beyond */ 464 lt->tm_year += (this_year - (this_year % 100)); 465 /* FALLTHROUGH */ 466 case 8: 467 lt->tm_mon = ATOI2(timearg); 468 if (--lt->tm_mon < 0 || lt->tm_mon > 11) 469 badtime(); 470 /* FALLTHROUGH */ 471 case 6: 472 lt->tm_mday = ATOI2(timearg); 473 if (lt->tm_mday < 1 || lt->tm_mday > 31) 474 badtime(); 475 /* FALLTHROUGH */ 476 case 4: 477 lt->tm_hour = ATOI2(timearg); 478 if (lt->tm_hour < 0 || lt->tm_hour > 23) 479 badtime(); 480 lt->tm_min = ATOI2(timearg); 481 if (lt->tm_min < 0 || lt->tm_min > 59) 482 badtime(); 483 lt->tm_sec = 0; 484 if ((shuttime = mktime(lt)) == -1) 485 badtime(); 486 if ((offset = shuttime - now) < 0) 487 errx(1, "that time is already past."); 488 break; 489 default: 490 badtime(); 491 } 492 } 493 494 #define NOMSG "\n\nNO LOGINS: System going down at " 495 static void 496 nolog(void) 497 { 498 int logfd; 499 char *ct; 500 501 (void)unlink(_PATH_NOLOGIN); /* in case linked to another file */ 502 (void)signal(SIGINT, finish); 503 (void)signal(SIGHUP, finish); 504 (void)signal(SIGQUIT, finish); 505 (void)signal(SIGTERM, finish); 506 if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC, 507 0664)) >= 0) { 508 (void)write(logfd, NOMSG, sizeof(NOMSG) - 1); 509 ct = ctime(&shuttime); 510 (void)write(logfd, ct + 11, 5); 511 (void)write(logfd, "\n\n", 2); 512 (void)write(logfd, mbuf, strlen(mbuf)); 513 (void)close(logfd); 514 } 515 } 516 517 static void 518 finish(int signo __unused) 519 { 520 if (!killflg) 521 (void)unlink(_PATH_NOLOGIN); 522 exit(0); 523 } 524 525 static void 526 badtime(void) 527 { 528 errx(1, "bad time format"); 529 } 530 531 static void 532 usage(const char *cp) 533 { 534 if (cp != NULL) 535 warnx("%s", cp); 536 (void)fprintf(stderr, 537 "usage: shutdown [-] [-h | -p | -r | -k] [-o [-n]] time [warning-message ...]\n" 538 " poweroff\n"); 539 exit(1); 540 } 541