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. 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 * @(#) Copyright (c) 1988, 1990, 1993 The Regents of the University of California. All rights reserved. 30 * @(#)shutdown.c 8.4 (Berkeley) 4/28/95 31 * $FreeBSD: src/sbin/shutdown/shutdown.c,v 1.21.2.1 2001/07/30 10:38:08 dd Exp $ 32 */ 33 34 #include <sys/param.h> 35 #include <sys/time.h> 36 #include <sys/resource.h> 37 #include <sys/syslog.h> 38 39 #include <ctype.h> 40 #include <err.h> 41 #include <fcntl.h> 42 #include <pwd.h> 43 #include <setjmp.h> 44 #include <signal.h> 45 #include <stdio.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <unistd.h> 49 50 #include "pathnames.h" 51 52 #ifdef DEBUG 53 #undef _PATH_NOLOGIN 54 #define _PATH_NOLOGIN "./nologin" 55 #endif 56 57 #define H *60*60 58 #define M *60 59 #define S *1 60 #define NOLOG_TIME 5*60 61 static struct interval { 62 int timeleft, timetowait; 63 } tlist[] = { 64 { 10 H, 5 H }, 65 { 5 H, 3 H }, 66 { 2 H, 1 H }, 67 { 1 H, 30 M }, 68 { 30 M, 10 M }, 69 { 20 M, 10 M }, 70 { 10 M, 5 M }, 71 { 5 M, 3 M }, 72 { 2 M, 1 M }, 73 { 1 M, 30 S }, 74 { 30 S, 30 S }, 75 { 0 , 0 } 76 }; 77 #undef H 78 #undef M 79 #undef S 80 81 static time_t offset, shuttime; 82 static int dohalt, dopower, doreboot, killflg, mbuflen, oflag; 83 static char mbuf[BUFSIZ]; 84 static const char *nosync, *whom; 85 86 static void badtime(void); 87 static void die_you_gravy_sucking_pig_dog(void); 88 static void finish(int); 89 static void getoffset(char *); 90 static void loop(void); 91 static void nolog(void); 92 static void timeout(int); 93 static void timewarn(int); 94 static void usage(const char *); 95 96 extern const char **environ; 97 98 int 99 main(int argc, char **argv) 100 { 101 char *p, *endp; 102 struct passwd *pw; 103 int arglen, ch, len, readstdin; 104 105 #ifndef DEBUG 106 if (geteuid()) 107 errx(1, "NOT super-user"); 108 #endif 109 110 nosync = NULL; 111 readstdin = 0; 112 113 /* 114 * Test for the special case where the utility is called as 115 * "poweroff", for which it runs 'shutdown -p now'. 116 */ 117 if ((p = strrchr(argv[0], '/')) == NULL) 118 p = argv[0]; 119 else 120 ++p; 121 if (strcmp(p, "poweroff") == 0) { 122 if (getopt(argc, argv, "") != -1) 123 usage(NULL); 124 argc -= optind; 125 argv += optind; 126 if (argc != 0) 127 usage(NULL); 128 dopower = 1; 129 offset = 0; 130 (void)time(&shuttime); 131 goto poweroff; 132 } 133 134 while ((ch = getopt(argc, argv, "-hknopr")) != -1) 135 switch (ch) { 136 case '-': 137 readstdin = 1; 138 break; 139 case 'h': 140 dohalt = 1; 141 break; 142 case 'k': 143 killflg = 1; 144 break; 145 case 'n': 146 nosync = "-n"; 147 break; 148 case 'o': 149 oflag = 1; 150 break; 151 case 'p': 152 dopower = 1; 153 break; 154 case 'r': 155 doreboot = 1; 156 break; 157 case '?': 158 default: 159 usage(NULL); 160 } 161 argc -= optind; 162 argv += optind; 163 164 if (argc < 1) 165 usage(NULL); 166 167 if (killflg + doreboot + dohalt + dopower > 1) 168 usage("incompatible switches -h, -k, -p and -r"); 169 170 if (oflag && !(dohalt || dopower || doreboot)) 171 usage("-o requires -h, -p or -r"); 172 173 if (nosync != NULL && !oflag) 174 usage("-n requires -o"); 175 176 getoffset(*argv++); 177 178 poweroff: 179 if (*argv) { 180 for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) { 181 arglen = strlen(*argv); 182 if ((len -= arglen) <= 2) 183 break; 184 if (p != mbuf) 185 *p++ = ' '; 186 memmove(p, *argv, arglen); 187 p += arglen; 188 } 189 *p = '\n'; 190 *++p = '\0'; 191 } 192 193 if (readstdin) { 194 p = mbuf; 195 endp = mbuf + sizeof(mbuf) - 2; 196 for (;;) { 197 if (!fgets(p, endp - p + 1, stdin)) 198 break; 199 for (; *p && p < endp; ++p); 200 if (p == endp) { 201 *p = '\n'; 202 *++p = '\0'; 203 break; 204 } 205 } 206 } 207 mbuflen = strlen(mbuf); 208 209 if (offset) 210 printf("Shutdown at %.24s.\n", ctime(&shuttime)); 211 else 212 printf("Shutdown NOW!\n"); 213 214 if (!(whom = getlogin())) 215 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???"; 216 217 #ifdef DEBUG 218 putc('\n', stdout); 219 #else 220 setpriority(PRIO_PROCESS, 0, PRIO_MIN); 221 { 222 int forkpid; 223 224 forkpid = fork(); 225 if (forkpid == -1) 226 err(1, "fork"); 227 if (forkpid) 228 errx(0, "[pid %d]", forkpid); 229 } 230 setsid(); 231 #endif 232 openlog("shutdown", LOG_CONS, LOG_AUTH); 233 loop(); 234 return(0); 235 } 236 237 static void 238 loop(void) 239 { 240 struct interval *tp; 241 u_int sltime; 242 int logged; 243 244 if (offset <= NOLOG_TIME) { 245 logged = 1; 246 nolog(); 247 } 248 else 249 logged = 0; 250 tp = tlist; 251 if (tp->timeleft < offset) 252 sleep((u_int)(offset - tp->timeleft)); 253 else { 254 while (tp->timeleft && offset < tp->timeleft) 255 ++tp; 256 /* 257 * Warn now, if going to sleep more than a fifth of 258 * the next wait time. 259 */ 260 if ((sltime = offset - tp->timeleft)) { 261 if (sltime > (u_int)(tp->timetowait / 5)) 262 timewarn(offset); 263 sleep(sltime); 264 } 265 } 266 for (;; ++tp) { 267 timewarn(tp->timeleft); 268 if (!logged && tp->timeleft <= NOLOG_TIME) { 269 logged = 1; 270 nolog(); 271 } 272 sleep((u_int)tp->timetowait); 273 if (!tp->timeleft) 274 break; 275 } 276 die_you_gravy_sucking_pig_dog(); 277 } 278 279 static jmp_buf alarmbuf; 280 281 static const char *restricted_environ[] = { 282 "PATH=" _PATH_STDPATH, 283 NULL 284 }; 285 286 static void 287 timewarn(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 gethostname(hostname, sizeof(hostname)); 296 297 /* undoc -n option to wall suppresses normal wall banner */ 298 snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL); 299 environ = restricted_environ; 300 if (!(pf = popen(wcmd, "w"))) { 301 syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL); 302 return; 303 } 304 305 fprintf(pf, 306 "\007*** %sSystem shutdown message from %s@%s ***\007\n", 307 timeleft ? "": "FINAL ", whom, hostname); 308 309 if (timeleft > 10*60) 310 fprintf(pf, "System going down at %5.5s\n\n", 311 ctime(&shuttime) + 11); 312 else if (timeleft > 59) 313 fprintf(pf, "System going down in %d minute%s\n\n", 314 timeleft / 60, (timeleft > 60) ? "s" : ""); 315 else if (timeleft) 316 fprintf(pf, "System going down in 30 seconds\n\n"); 317 else 318 fprintf(pf, "System going down IMMEDIATELY\n\n"); 319 320 if (mbuflen) 321 fwrite(mbuf, sizeof(*mbuf), mbuflen, pf); 322 323 /* 324 * play some games, just in case wall doesn't come back 325 * probably unnecessary, given that wall is careful. 326 */ 327 if (!setjmp(alarmbuf)) { 328 signal(SIGALRM, timeout); 329 alarm((u_int)30); 330 pclose(pf); 331 alarm((u_int)0); 332 signal(SIGALRM, SIG_DFL); 333 } 334 } 335 336 static void 337 timeout(int signo __unused) 338 { 339 longjmp(alarmbuf, 1); 340 } 341 342 static void 343 die_you_gravy_sucking_pig_dog(void) 344 { 345 char *empty_environ[] = { NULL }; 346 347 syslog(LOG_NOTICE, "%s by %s: %s", 348 doreboot ? "reboot" : dohalt ? "halt" : dopower ? "power-down" : 349 "shutdown", whom, mbuf); 350 sleep(2); 351 352 printf("\r\nSystem shutdown time has arrived\007\007\r\n"); 353 if (killflg) { 354 printf("\rbut you'll have to do it yourself\r\n"); 355 exit(0); 356 } 357 #ifdef DEBUG 358 if (doreboot) 359 printf("reboot"); 360 else if (dohalt) 361 printf("halt"); 362 else if (dopower) 363 printf("power-down"); 364 if (nosync != NULL) 365 printf(" no sync"); 366 printf("\nkill -HUP 1\n"); 367 #else 368 if (!oflag) { 369 kill(1, doreboot ? SIGINT : /* reboot */ 370 dohalt ? SIGUSR1 : /* halt */ 371 dopower ? SIGUSR2 : /* power-down */ 372 SIGTERM); /* single-user */ 373 } else { 374 if (doreboot) { 375 execle(_PATH_REBOOT, "reboot", "-l", nosync, 376 NULL, empty_environ); 377 syslog(LOG_ERR, "shutdown: can't exec %s: %m.", 378 _PATH_REBOOT); 379 warn(_PATH_REBOOT); 380 } 381 else if (dohalt) { 382 execle(_PATH_HALT, "halt", "-l", nosync, 383 NULL, empty_environ); 384 syslog(LOG_ERR, "shutdown: can't exec %s: %m.", 385 _PATH_HALT); 386 warn(_PATH_HALT); 387 } 388 else if (dopower) { 389 execle(_PATH_HALT, "halt", "-l", "-p", nosync, 390 NULL, empty_environ); 391 syslog(LOG_ERR, "shutdown: can't exec %s: %m.", 392 _PATH_HALT); 393 warn(_PATH_HALT); 394 } 395 kill(1, SIGTERM); /* to single-user */ 396 } 397 #endif 398 finish(0); 399 } 400 401 #define ATOI2(p) (p[0] - '0') * 10 + (p[1] - '0'); p += 2; 402 403 static void 404 getoffset(char *timearg) 405 { 406 struct tm *lt; 407 char *p; 408 time_t now; 409 int this_year; 410 411 time(&now); 412 413 if (!strcasecmp(timearg, "now")) { /* now */ 414 offset = 0; 415 shuttime = now; 416 return; 417 } 418 419 if (*timearg == '+') { /* +minutes */ 420 if (!isdigit(*++timearg)) 421 badtime(); 422 if ((offset = atoi(timearg) * 60) < 0) 423 badtime(); 424 shuttime = now + offset; 425 return; 426 } 427 428 /* handle hh:mm by getting rid of the colon */ 429 for (p = timearg; *p; ++p) 430 if (!isascii(*p) || !isdigit(*p)) { 431 if (*p == ':' && strlen(p) == 3) { 432 p[0] = p[1]; 433 p[1] = p[2]; 434 p[2] = '\0'; 435 } 436 else 437 badtime(); 438 } 439 440 unsetenv("TZ"); /* OUR timezone */ 441 lt = localtime(&now); /* current time val */ 442 443 switch(strlen(timearg)) { 444 case 10: 445 this_year = lt->tm_year; 446 lt->tm_year = ATOI2(timearg); 447 /* 448 * check if the specified year is in the next century. 449 * allow for one year of user error as many people will 450 * enter n - 1 at the start of year n. 451 */ 452 if (lt->tm_year < (this_year % 100) - 1) 453 lt->tm_year += 100; 454 /* adjust for the year 2000 and beyond */ 455 lt->tm_year += (this_year - (this_year % 100)); 456 /* FALLTHROUGH */ 457 case 8: 458 lt->tm_mon = ATOI2(timearg); 459 if (--lt->tm_mon < 0 || lt->tm_mon > 11) 460 badtime(); 461 /* FALLTHROUGH */ 462 case 6: 463 lt->tm_mday = ATOI2(timearg); 464 if (lt->tm_mday < 1 || lt->tm_mday > 31) 465 badtime(); 466 /* FALLTHROUGH */ 467 case 4: 468 lt->tm_hour = ATOI2(timearg); 469 if (lt->tm_hour < 0 || lt->tm_hour > 23) 470 badtime(); 471 lt->tm_min = ATOI2(timearg); 472 if (lt->tm_min < 0 || lt->tm_min > 59) 473 badtime(); 474 lt->tm_sec = 0; 475 if ((shuttime = mktime(lt)) == -1) 476 badtime(); 477 if ((offset = shuttime - now) < 0) 478 errx(1, "that time is already past."); 479 break; 480 default: 481 badtime(); 482 } 483 } 484 485 #define NOMSG "\n\nNO LOGINS: System going down at " 486 static void 487 nolog(void) 488 { 489 int logfd; 490 char *ct; 491 492 unlink(_PATH_NOLOGIN); /* in case linked to another file */ 493 signal(SIGINT, finish); 494 signal(SIGHUP, finish); 495 signal(SIGQUIT, finish); 496 signal(SIGTERM, finish); 497 if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC, 498 0664)) >= 0) { 499 write(logfd, NOMSG, sizeof(NOMSG) - 1); 500 ct = ctime(&shuttime); 501 write(logfd, ct + 11, 5); 502 write(logfd, "\n\n", 2); 503 write(logfd, mbuf, strlen(mbuf)); 504 close(logfd); 505 } 506 } 507 508 static void 509 finish(int signo __unused) 510 { 511 if (!killflg) 512 unlink(_PATH_NOLOGIN); 513 exit(0); 514 } 515 516 static void 517 badtime(void) 518 { 519 errx(1, "bad time format"); 520 } 521 522 static void 523 usage(const char *cp) 524 { 525 if (cp != NULL) 526 warnx("%s", cp); 527 fprintf(stderr, 528 "usage: shutdown [-] [-h | -p | -r | -k] [-o [-n]]" 529 " time [warning-message ...]\n" 530 " poweroff\n"); 531 exit(1); 532 } 533