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 <errno.h> 52 #include <fcntl.h> 53 #include <paths.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 <unistd.h> 61 62 #ifdef DEBUG 63 #undef _PATH_NOLOGIN 64 #define _PATH_NOLOGIN "./nologin" 65 #endif 66 67 #define H *60*60 68 #define M *60 69 #define S *1 70 #define NOLOG_TIME 5*60 71 static struct interval { 72 int timeleft, timetowait; 73 } tlist[] = { 74 { 10 H, 5 H }, 75 { 5 H, 3 H }, 76 { 2 H, 1 H }, 77 { 1 H, 30 M }, 78 { 30 M, 10 M }, 79 { 20 M, 10 M }, 80 { 10 M, 5 M }, 81 { 5 M, 3 M }, 82 { 2 M, 1 M }, 83 { 1 M, 30 S }, 84 { 30 S, 30 S }, 85 { 0 , 0 } 86 }; 87 #undef H 88 #undef M 89 #undef S 90 91 static time_t offset, shuttime; 92 static int dohalt, dopower, doreboot, killflg, mbuflen, oflag; 93 static char mbuf[BUFSIZ]; 94 static const char *nosync, *whom; 95 96 static void badtime(void); 97 static void die_you_gravy_sucking_pig_dog(void); 98 static void finish(int); 99 static void getoffset(char *); 100 static void loop(void); 101 static void nolog(void); 102 static void timeout(int); 103 static void timewarn(int); 104 static void usage(const char *); 105 106 extern const char **environ; 107 108 int 109 main(int argc, char **argv) 110 { 111 char *p, *endp; 112 struct passwd *pw; 113 int arglen, ch, len, readstdin; 114 115 #ifndef DEBUG 116 if (geteuid()) 117 errx(1, "NOT super-user"); 118 #endif 119 120 nosync = NULL; 121 readstdin = 0; 122 123 /* 124 * Test for the special case where the utility is called as 125 * "poweroff", for which it runs 'shutdown -p now'. 126 */ 127 if ((p = strrchr(argv[0], '/')) == NULL) 128 p = argv[0]; 129 else 130 ++p; 131 if (strcmp(p, "poweroff") == 0) { 132 if (getopt(argc, argv, "") != -1) 133 usage((char *)NULL); 134 argc -= optind; 135 argv += optind; 136 if (argc != 0) 137 usage((char *)NULL); 138 dopower = 1; 139 offset = 0; 140 (void)time(&shuttime); 141 goto poweroff; 142 } 143 144 while ((ch = getopt(argc, argv, "-hknopr")) != -1) 145 switch (ch) { 146 case '-': 147 readstdin = 1; 148 break; 149 case 'h': 150 dohalt = 1; 151 break; 152 case 'k': 153 killflg = 1; 154 break; 155 case 'n': 156 nosync = "-n"; 157 break; 158 case 'o': 159 oflag = 1; 160 break; 161 case 'p': 162 dopower = 1; 163 break; 164 case 'r': 165 doreboot = 1; 166 break; 167 case '?': 168 default: 169 usage((char *)NULL); 170 } 171 argc -= optind; 172 argv += optind; 173 174 if (argc < 1) 175 usage((char *)NULL); 176 177 if (killflg + doreboot + dohalt + dopower > 1) 178 usage("incompatible switches -h, -k, -p and -r"); 179 180 if (oflag && !(dohalt || dopower || doreboot)) 181 usage("-o requires -h, -p or -r"); 182 183 if (nosync != NULL && !oflag) 184 usage("-n requires -o"); 185 186 getoffset(*argv++); 187 188 poweroff: 189 if (*argv) { 190 for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) { 191 arglen = strlen(*argv); 192 if ((len -= arglen) <= 2) 193 break; 194 if (p != mbuf) 195 *p++ = ' '; 196 memmove(p, *argv, arglen); 197 p += arglen; 198 } 199 *p = '\n'; 200 *++p = '\0'; 201 } 202 203 if (readstdin) { 204 p = mbuf; 205 endp = mbuf + sizeof(mbuf) - 2; 206 for (;;) { 207 if (!fgets(p, endp - p + 1, stdin)) 208 break; 209 for (; *p && p < endp; ++p); 210 if (p == endp) { 211 *p = '\n'; 212 *++p = '\0'; 213 break; 214 } 215 } 216 } 217 mbuflen = strlen(mbuf); 218 219 if (offset) 220 (void)printf("Shutdown at %.24s.\n", ctime(&shuttime)); 221 else 222 (void)printf("Shutdown NOW!\n"); 223 224 if (!(whom = getlogin())) 225 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???"; 226 227 #ifdef DEBUG 228 (void)putc('\n', stdout); 229 #else 230 (void)setpriority(PRIO_PROCESS, 0, PRIO_MIN); 231 { 232 int forkpid; 233 234 forkpid = fork(); 235 if (forkpid == -1) 236 err(1, "fork"); 237 if (forkpid) 238 errx(0, "[pid %d]", forkpid); 239 } 240 setsid(); 241 #endif 242 openlog("shutdown", LOG_CONS, LOG_AUTH); 243 loop(); 244 return(0); 245 } 246 247 static void 248 loop(void) 249 { 250 struct interval *tp; 251 u_int sltime; 252 int logged; 253 254 if (offset <= NOLOG_TIME) { 255 logged = 1; 256 nolog(); 257 } 258 else 259 logged = 0; 260 tp = tlist; 261 if (tp->timeleft < offset) 262 (void)sleep((u_int)(offset - tp->timeleft)); 263 else { 264 while (tp->timeleft && offset < tp->timeleft) 265 ++tp; 266 /* 267 * Warn now, if going to sleep more than a fifth of 268 * the next wait time. 269 */ 270 if ((sltime = offset - tp->timeleft)) { 271 if (sltime > (u_int)(tp->timetowait / 5)) 272 timewarn(offset); 273 (void)sleep(sltime); 274 } 275 } 276 for (;; ++tp) { 277 timewarn(tp->timeleft); 278 if (!logged && tp->timeleft <= NOLOG_TIME) { 279 logged = 1; 280 nolog(); 281 } 282 (void)sleep((u_int)tp->timetowait); 283 if (!tp->timeleft) 284 break; 285 } 286 die_you_gravy_sucking_pig_dog(); 287 } 288 289 static jmp_buf alarmbuf; 290 291 static const char *restricted_environ[] = { 292 "PATH=" _PATH_STDPATH, 293 NULL 294 }; 295 296 static void 297 timewarn(int timeleft) 298 { 299 static int first; 300 static char hostname[MAXHOSTNAMELEN + 1]; 301 FILE *pf; 302 char wcmd[MAXPATHLEN + 4]; 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 %s30 seconds\n\n", 327 (offset > 0 && offset < 30 ? "less than " : "")); 328 else 329 (void)fprintf(pf, "System going down IMMEDIATELY\n\n"); 330 331 if (mbuflen) 332 (void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf); 333 334 /* 335 * play some games, just in case wall doesn't come back 336 * probably unnecessary, given that wall is careful. 337 */ 338 if (!setjmp(alarmbuf)) { 339 (void)signal(SIGALRM, timeout); 340 (void)alarm((u_int)30); 341 (void)pclose(pf); 342 (void)alarm((u_int)0); 343 (void)signal(SIGALRM, SIG_DFL); 344 } 345 } 346 347 static void 348 timeout(int signo __unused) 349 { 350 longjmp(alarmbuf, 1); 351 } 352 353 static void 354 die_you_gravy_sucking_pig_dog(void) 355 { 356 char *empty_environ[] = { NULL }; 357 358 syslog(LOG_NOTICE, "%s by %s: %s", 359 doreboot ? "reboot" : dohalt ? "halt" : dopower ? "power-down" : 360 "shutdown", whom, mbuf); 361 362 (void)printf("\r\nSystem shutdown time has arrived\007\007\r\n"); 363 if (killflg) { 364 (void)printf("\rbut you'll have to do it yourself\r\n"); 365 exit(0); 366 } 367 #ifdef DEBUG 368 if (doreboot) 369 (void)printf("reboot"); 370 else if (dohalt) 371 (void)printf("halt"); 372 else if (dopower) 373 (void)printf("power-down"); 374 if (nosync != NULL) 375 (void)printf(" no sync"); 376 (void)printf("\nkill -HUP 1\n"); 377 #else 378 if (!oflag) { 379 (void)kill(1, doreboot ? SIGINT : /* reboot */ 380 dohalt ? SIGUSR1 : /* halt */ 381 dopower ? SIGUSR2 : /* power-down */ 382 SIGTERM); /* single-user */ 383 } else { 384 if (doreboot) { 385 execle(_PATH_REBOOT, "reboot", "-l", nosync, 386 (char *)NULL, empty_environ); 387 syslog(LOG_ERR, "shutdown: can't exec %s: %m.", 388 _PATH_REBOOT); 389 warn(_PATH_REBOOT); 390 } 391 else if (dohalt) { 392 execle(_PATH_HALT, "halt", "-l", nosync, 393 (char *)NULL, empty_environ); 394 syslog(LOG_ERR, "shutdown: can't exec %s: %m.", 395 _PATH_HALT); 396 warn(_PATH_HALT); 397 } 398 else if (dopower) { 399 execle(_PATH_HALT, "halt", "-l", "-p", nosync, 400 (char *)NULL, empty_environ); 401 syslog(LOG_ERR, "shutdown: can't exec %s: %m.", 402 _PATH_HALT); 403 warn(_PATH_HALT); 404 } 405 (void)kill(1, SIGTERM); /* to single-user */ 406 } 407 #endif 408 finish(0); 409 } 410 411 #define ATOI2(p) (p[0] - '0') * 10 + (p[1] - '0'); p += 2; 412 413 static void 414 getoffset(char *timearg) 415 { 416 struct tm *lt; 417 char *p; 418 time_t now; 419 int this_year; 420 char *timeunit; 421 422 (void)time(&now); 423 424 if (!strcasecmp(timearg, "now")) { /* now */ 425 offset = 0; 426 shuttime = now; 427 return; 428 } 429 430 if (*timearg == '+') { /* +minutes */ 431 if (!isdigit(*++timearg)) 432 badtime(); 433 errno = 0; 434 offset = strtol(timearg, &timeunit, 10); 435 if (offset < 0 || offset == LONG_MAX || errno != 0) 436 badtime(); 437 if (timeunit[0] == '\0' || strcasecmp(timeunit, "m") == 0 || 438 strcasecmp(timeunit, "min") == 0 || 439 strcasecmp(timeunit, "mins") == 0) { 440 offset *= 60; 441 } else if (strcasecmp(timeunit, "h") == 0 || 442 strcasecmp(timeunit, "hour") == 0 || 443 strcasecmp(timeunit, "hours") == 0) { 444 offset *= 60 * 60; 445 } else if (strcasecmp(timeunit, "s") == 0 || 446 strcasecmp(timeunit, "sec") == 0 || 447 strcasecmp(timeunit, "secs") == 0) { 448 offset *= 1; 449 } else { 450 badtime(); 451 } 452 shuttime = now + offset; 453 return; 454 } 455 456 /* handle hh:mm by getting rid of the colon */ 457 for (p = timearg; *p; ++p) 458 if (!isascii(*p) || !isdigit(*p)) { 459 if (*p == ':' && strlen(p) == 3) { 460 p[0] = p[1]; 461 p[1] = p[2]; 462 p[2] = '\0'; 463 } 464 else 465 badtime(); 466 } 467 468 unsetenv("TZ"); /* OUR timezone */ 469 lt = localtime(&now); /* current time val */ 470 471 switch(strlen(timearg)) { 472 case 10: 473 this_year = lt->tm_year; 474 lt->tm_year = ATOI2(timearg); 475 /* 476 * check if the specified year is in the next century. 477 * allow for one year of user error as many people will 478 * enter n - 1 at the start of year n. 479 */ 480 if (lt->tm_year < (this_year % 100) - 1) 481 lt->tm_year += 100; 482 /* adjust for the year 2000 and beyond */ 483 lt->tm_year += (this_year - (this_year % 100)); 484 /* FALLTHROUGH */ 485 case 8: 486 lt->tm_mon = ATOI2(timearg); 487 if (--lt->tm_mon < 0 || lt->tm_mon > 11) 488 badtime(); 489 /* FALLTHROUGH */ 490 case 6: 491 lt->tm_mday = ATOI2(timearg); 492 if (lt->tm_mday < 1 || lt->tm_mday > 31) 493 badtime(); 494 /* FALLTHROUGH */ 495 case 4: 496 lt->tm_hour = ATOI2(timearg); 497 if (lt->tm_hour < 0 || lt->tm_hour > 23) 498 badtime(); 499 lt->tm_min = ATOI2(timearg); 500 if (lt->tm_min < 0 || lt->tm_min > 59) 501 badtime(); 502 lt->tm_sec = 0; 503 if ((shuttime = mktime(lt)) == -1) 504 badtime(); 505 if ((offset = shuttime - now) < 0) 506 errx(1, "that time is already past."); 507 break; 508 default: 509 badtime(); 510 } 511 } 512 513 #define NOMSG "\n\nNO LOGINS: System going down at " 514 static void 515 nolog(void) 516 { 517 int logfd; 518 char *ct; 519 520 (void)unlink(_PATH_NOLOGIN); /* in case linked to another file */ 521 (void)signal(SIGINT, finish); 522 (void)signal(SIGHUP, finish); 523 (void)signal(SIGQUIT, finish); 524 (void)signal(SIGTERM, finish); 525 if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC, 526 0664)) >= 0) { 527 (void)write(logfd, NOMSG, sizeof(NOMSG) - 1); 528 ct = ctime(&shuttime); 529 (void)write(logfd, ct + 11, 5); 530 (void)write(logfd, "\n\n", 2); 531 (void)write(logfd, mbuf, strlen(mbuf)); 532 (void)close(logfd); 533 } 534 } 535 536 static void 537 finish(int signo __unused) 538 { 539 if (!killflg) 540 (void)unlink(_PATH_NOLOGIN); 541 exit(0); 542 } 543 544 static void 545 badtime(void) 546 { 547 errx(1, "bad time format"); 548 } 549 550 static void 551 usage(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]] time [warning-message ...]\n" 557 " poweroff\n"); 558 exit(1); 559 } 560