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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#) Copyright (c) 1988, 1990, 1993 The Regents of the University of California. All rights reserved. 34 * @(#)shutdown.c 8.4 (Berkeley) 4/28/95 35 * $FreeBSD: src/sbin/shutdown/shutdown.c,v 1.21.2.1 2001/07/30 10:38:08 dd Exp $ 36 * $DragonFly: src/sbin/shutdown/shutdown.c,v 1.4 2003/11/01 17:16:02 drhodus Exp $ 37 */ 38 39 #include <sys/param.h> 40 #include <sys/time.h> 41 #include <sys/resource.h> 42 #include <sys/syslog.h> 43 44 #include <ctype.h> 45 #include <err.h> 46 #include <fcntl.h> 47 #include <pwd.h> 48 #include <setjmp.h> 49 #include <signal.h> 50 #include <stdio.h> 51 #include <stdlib.h> 52 #include <string.h> 53 #include <unistd.h> 54 55 #include "pathnames.h" 56 57 #ifdef DEBUG 58 #undef _PATH_NOLOGIN 59 #define _PATH_NOLOGIN "./nologin" 60 #endif 61 62 #define H *60*60 63 #define M *60 64 #define S *1 65 #define NOLOG_TIME 5*60 66 struct interval { 67 int timeleft, timetowait; 68 } tlist[] = { 69 { 10 H, 5 H }, 70 { 5 H, 3 H }, 71 { 2 H, 1 H }, 72 { 1 H, 30 M }, 73 { 30 M, 10 M }, 74 { 20 M, 10 M }, 75 { 10 M, 5 M }, 76 { 5 M, 3 M }, 77 { 2 M, 1 M }, 78 { 1 M, 30 S }, 79 { 30 S, 30 S }, 80 { 0 , 0 } 81 }; 82 #undef H 83 #undef M 84 #undef S 85 86 static time_t offset, shuttime; 87 static int dohalt, dopower, doreboot, killflg, mbuflen, oflag; 88 static char mbuf[BUFSIZ]; 89 static const char *nosync, *whom; 90 91 void badtime(void); 92 void die_you_gravy_sucking_pig_dog(void); 93 void finish(int); 94 void getoffset(char *); 95 void loop(void); 96 void nolog(void); 97 void timeout(int); 98 void timewarn(int); 99 void usage(const char *); 100 101 int 102 main(int argc, char **argv) 103 { 104 char *p, *endp; 105 struct passwd *pw; 106 int arglen, ch, len, readstdin; 107 108 #ifndef DEBUG 109 if (geteuid()) 110 errx(1, "NOT super-user"); 111 #endif 112 nosync = NULL; 113 readstdin = 0; 114 while ((ch = getopt(argc, argv, "-hknopr")) != -1) 115 switch (ch) { 116 case '-': 117 readstdin = 1; 118 break; 119 case 'h': 120 dohalt = 1; 121 break; 122 case 'k': 123 killflg = 1; 124 break; 125 case 'n': 126 nosync = "-n"; 127 break; 128 case 'o': 129 oflag = 1; 130 break; 131 case 'p': 132 dopower = 1; 133 break; 134 case 'r': 135 doreboot = 1; 136 break; 137 case '?': 138 default: 139 usage((char *)NULL); 140 } 141 argc -= optind; 142 argv += optind; 143 144 if (argc < 1) 145 usage((char *)NULL); 146 147 if (killflg + doreboot + dohalt + dopower > 1) 148 usage("incompatible switches -h, -k, -p and -r"); 149 150 if (oflag && !(dohalt || dopower || doreboot)) 151 usage("-o requires -h, -p or -r"); 152 153 if (nosync != NULL && !oflag) 154 usage("-n requires -o"); 155 156 getoffset(*argv++); 157 158 if (*argv) { 159 for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) { 160 arglen = strlen(*argv); 161 if ((len -= arglen) <= 2) 162 break; 163 if (p != mbuf) 164 *p++ = ' '; 165 memmove(p, *argv, arglen); 166 p += arglen; 167 } 168 *p = '\n'; 169 *++p = '\0'; 170 } 171 172 if (readstdin) { 173 p = mbuf; 174 endp = mbuf + sizeof(mbuf) - 2; 175 for (;;) { 176 if (!fgets(p, endp - p + 1, stdin)) 177 break; 178 for (; *p && p < endp; ++p); 179 if (p == endp) { 180 *p = '\n'; 181 *++p = '\0'; 182 break; 183 } 184 } 185 } 186 mbuflen = strlen(mbuf); 187 188 if (offset) 189 (void)printf("Shutdown at %.24s.\n", ctime(&shuttime)); 190 else 191 (void)printf("Shutdown NOW!\n"); 192 193 if (!(whom = getlogin())) 194 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???"; 195 196 #ifdef DEBUG 197 (void)putc('\n', stdout); 198 #else 199 (void)setpriority(PRIO_PROCESS, 0, PRIO_MIN); 200 { 201 int forkpid; 202 203 forkpid = fork(); 204 if (forkpid == -1) 205 err(1, "fork"); 206 if (forkpid) 207 errx(0, "[pid %d]", forkpid); 208 } 209 setsid(); 210 #endif 211 openlog("shutdown", LOG_CONS, LOG_AUTH); 212 loop(); 213 return(0); 214 } 215 216 void 217 loop(void) 218 { 219 struct interval *tp; 220 u_int sltime; 221 int logged; 222 223 if (offset <= NOLOG_TIME) { 224 logged = 1; 225 nolog(); 226 } 227 else 228 logged = 0; 229 tp = tlist; 230 if (tp->timeleft < offset) 231 (void)sleep((u_int)(offset - tp->timeleft)); 232 else { 233 while (tp->timeleft && offset < tp->timeleft) 234 ++tp; 235 /* 236 * Warn now, if going to sleep more than a fifth of 237 * the next wait time. 238 */ 239 if ((sltime = offset - tp->timeleft)) { 240 if (sltime > (u_int)(tp->timetowait / 5)) 241 timewarn(offset); 242 (void)sleep(sltime); 243 } 244 } 245 for (;; ++tp) { 246 timewarn(tp->timeleft); 247 if (!logged && tp->timeleft <= NOLOG_TIME) { 248 logged = 1; 249 nolog(); 250 } 251 (void)sleep((u_int)tp->timetowait); 252 if (!tp->timeleft) 253 break; 254 } 255 die_you_gravy_sucking_pig_dog(); 256 } 257 258 static jmp_buf alarmbuf; 259 260 static const char *restricted_environ[] = { 261 "PATH=" _PATH_STDPATH, 262 NULL 263 }; 264 265 void 266 timewarn(int timeleft) 267 { 268 static int first; 269 static char hostname[MAXHOSTNAMELEN + 1]; 270 FILE *pf; 271 char wcmd[MAXPATHLEN + 4]; 272 extern const char **environ; 273 274 if (!first++) 275 (void)gethostname(hostname, sizeof(hostname)); 276 277 /* undoc -n option to wall suppresses normal wall banner */ 278 (void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL); 279 environ = restricted_environ; 280 if (!(pf = popen(wcmd, "w"))) { 281 syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL); 282 return; 283 } 284 285 (void)fprintf(pf, 286 "\007*** %sSystem shutdown message from %s@%s ***\007\n", 287 timeleft ? "": "FINAL ", whom, hostname); 288 289 if (timeleft > 10*60) 290 (void)fprintf(pf, "System going down at %5.5s\n\n", 291 ctime(&shuttime) + 11); 292 else if (timeleft > 59) 293 (void)fprintf(pf, "System going down in %d minute%s\n\n", 294 timeleft / 60, (timeleft > 60) ? "s" : ""); 295 else if (timeleft) 296 (void)fprintf(pf, "System going down in 30 seconds\n\n"); 297 else 298 (void)fprintf(pf, "System going down IMMEDIATELY\n\n"); 299 300 if (mbuflen) 301 (void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf); 302 303 /* 304 * play some games, just in case wall doesn't come back 305 * probably unnecessary, given that wall is careful. 306 */ 307 if (!setjmp(alarmbuf)) { 308 (void)signal(SIGALRM, timeout); 309 (void)alarm((u_int)30); 310 (void)pclose(pf); 311 (void)alarm((u_int)0); 312 (void)signal(SIGALRM, SIG_DFL); 313 } 314 } 315 316 void 317 timeout(int signo __unused) 318 { 319 longjmp(alarmbuf, 1); 320 } 321 322 void 323 die_you_gravy_sucking_pig_dog(void) 324 { 325 char *empty_environ[] = { NULL }; 326 327 syslog(LOG_NOTICE, "%s by %s: %s", 328 doreboot ? "reboot" : dohalt ? "halt" : dopower ? "power-down" : 329 "shutdown", whom, mbuf); 330 (void)sleep(2); 331 332 (void)printf("\r\nSystem shutdown time has arrived\007\007\r\n"); 333 if (killflg) { 334 (void)printf("\rbut you'll have to do it yourself\r\n"); 335 exit(0); 336 } 337 #ifdef DEBUG 338 if (doreboot) 339 (void)printf("reboot"); 340 else if (dohalt) 341 (void)printf("halt"); 342 else if (dopower) 343 (void)printf("power-down"); 344 if (nosync != NULL) 345 (void)printf(" no sync"); 346 (void)printf("\nkill -HUP 1\n"); 347 #else 348 if (!oflag) { 349 (void)kill(1, doreboot ? SIGINT : /* reboot */ 350 dohalt ? SIGUSR1 : /* halt */ 351 dopower ? SIGUSR2 : /* power-down */ 352 SIGTERM); /* single-user */ 353 } else { 354 if (doreboot) { 355 execle(_PATH_REBOOT, "reboot", "-l", nosync, 356 (char *)NULL, empty_environ); 357 syslog(LOG_ERR, "shutdown: can't exec %s: %m.", 358 _PATH_REBOOT); 359 warn(_PATH_REBOOT); 360 } 361 else if (dohalt) { 362 execle(_PATH_HALT, "halt", "-l", nosync, 363 (char *)NULL, empty_environ); 364 syslog(LOG_ERR, "shutdown: can't exec %s: %m.", 365 _PATH_HALT); 366 warn(_PATH_HALT); 367 } 368 else if (dopower) { 369 execle(_PATH_HALT, "halt", "-l", "-p", nosync, 370 (char *)NULL, empty_environ); 371 syslog(LOG_ERR, "shutdown: can't exec %s: %m.", 372 _PATH_HALT); 373 warn(_PATH_HALT); 374 } 375 (void)kill(1, SIGTERM); /* to single-user */ 376 } 377 #endif 378 finish(0); 379 } 380 381 #define ATOI2(p) (p[0] - '0') * 10 + (p[1] - '0'); p += 2; 382 383 void 384 getoffset(char *timearg) 385 { 386 struct tm *lt; 387 char *p; 388 time_t now; 389 int this_year; 390 391 (void)time(&now); 392 393 if (!strcasecmp(timearg, "now")) { /* now */ 394 offset = 0; 395 shuttime = now; 396 return; 397 } 398 399 if (*timearg == '+') { /* +minutes */ 400 if (!isdigit(*++timearg)) 401 badtime(); 402 if ((offset = atoi(timearg) * 60) < 0) 403 badtime(); 404 shuttime = now + offset; 405 return; 406 } 407 408 /* handle hh:mm by getting rid of the colon */ 409 for (p = timearg; *p; ++p) 410 if (!isascii(*p) || !isdigit(*p)) { 411 if (*p == ':' && strlen(p) == 3) { 412 p[0] = p[1]; 413 p[1] = p[2]; 414 p[2] = '\0'; 415 } 416 else 417 badtime(); 418 } 419 420 unsetenv("TZ"); /* OUR timezone */ 421 lt = localtime(&now); /* current time val */ 422 423 switch(strlen(timearg)) { 424 case 10: 425 this_year = lt->tm_year; 426 lt->tm_year = ATOI2(timearg); 427 /* 428 * check if the specified year is in the next century. 429 * allow for one year of user error as many people will 430 * enter n - 1 at the start of year n. 431 */ 432 if (lt->tm_year < (this_year % 100) - 1) 433 lt->tm_year += 100; 434 /* adjust for the year 2000 and beyond */ 435 lt->tm_year += (this_year - (this_year % 100)); 436 /* FALLTHROUGH */ 437 case 8: 438 lt->tm_mon = ATOI2(timearg); 439 if (--lt->tm_mon < 0 || lt->tm_mon > 11) 440 badtime(); 441 /* FALLTHROUGH */ 442 case 6: 443 lt->tm_mday = ATOI2(timearg); 444 if (lt->tm_mday < 1 || lt->tm_mday > 31) 445 badtime(); 446 /* FALLTHROUGH */ 447 case 4: 448 lt->tm_hour = ATOI2(timearg); 449 if (lt->tm_hour < 0 || lt->tm_hour > 23) 450 badtime(); 451 lt->tm_min = ATOI2(timearg); 452 if (lt->tm_min < 0 || lt->tm_min > 59) 453 badtime(); 454 lt->tm_sec = 0; 455 if ((shuttime = mktime(lt)) == -1) 456 badtime(); 457 if ((offset = shuttime - now) < 0) 458 errx(1, "that time is already past."); 459 break; 460 default: 461 badtime(); 462 } 463 } 464 465 #define NOMSG "\n\nNO LOGINS: System going down at " 466 void 467 nolog(void) 468 { 469 int logfd; 470 char *ct; 471 472 (void)unlink(_PATH_NOLOGIN); /* in case linked to another file */ 473 (void)signal(SIGINT, finish); 474 (void)signal(SIGHUP, finish); 475 (void)signal(SIGQUIT, finish); 476 (void)signal(SIGTERM, finish); 477 if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC, 478 0664)) >= 0) { 479 (void)write(logfd, NOMSG, sizeof(NOMSG) - 1); 480 ct = ctime(&shuttime); 481 (void)write(logfd, ct + 11, 5); 482 (void)write(logfd, "\n\n", 2); 483 (void)write(logfd, mbuf, strlen(mbuf)); 484 (void)close(logfd); 485 } 486 } 487 488 void 489 finish(int signo __unused) 490 { 491 if (!killflg) 492 (void)unlink(_PATH_NOLOGIN); 493 exit(0); 494 } 495 496 void 497 badtime(void) 498 { 499 errx(1, "bad time format"); 500 } 501 502 void 503 usage(const char *cp) 504 { 505 if (cp != NULL) 506 warnx("%s", cp); 507 (void)fprintf(stderr, 508 "usage: shutdown [-] [-h | -p | -r | -k] [-o [-n]]" 509 " time [warning-message ...]\n"); 510 exit(1); 511 } 512