1 /* $NetBSD: shutdown.c,v 1.16 1997/10/01 02:24:29 enami 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) Copyright (c) 1988, 1990, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)shutdown.c 8.4 (Berkeley) 4/28/95"; 45 #else 46 __RCSID("$NetBSD: shutdown.c,v 1.16 1997/10/01 02:24:29 enami Exp $"); 47 #endif 48 #endif /* not lint */ 49 50 #include <sys/param.h> 51 #include <sys/time.h> 52 #include <sys/resource.h> 53 #include <sys/syslog.h> 54 55 #include <ctype.h> 56 #include <fcntl.h> 57 #include <pwd.h> 58 #include <setjmp.h> 59 #include <signal.h> 60 #include <stdio.h> 61 #include <stdlib.h> 62 #include <string.h> 63 #include <tzfile.h> 64 #include <unistd.h> 65 66 #include "pathnames.h" 67 68 #ifdef DEBUG 69 #undef _PATH_NOLOGIN 70 #define _PATH_NOLOGIN "./nologin" 71 #undef _PATH_FASTBOOT 72 #define _PATH_FASTBOOT "./fastboot" 73 #endif 74 75 #define H *60*60 76 #define M *60 77 #define S *1 78 #define NOLOG_TIME 5*60 79 struct interval { 80 int timeleft, timetowait; 81 } tlist[] = { 82 { 10 H, 5 H }, { 5 H, 3 H }, { 2 H, 1 H }, { 1 H, 30 M }, 83 { 30 M, 10 M }, { 20 M, 10 M }, { 10 M, 5 M }, { 5 M, 3 M }, 84 { 2 M, 1 M }, { 1 M, 30 S }, { 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 dofast, dohalt, doreboot, killflg, mbuflen, nosync, dodump; 93 static char *whom, mbuf[BUFSIZ]; 94 95 void badtime __P((void)); 96 void die_you_gravy_sucking_pig_dog __P((void)); 97 void doitfast __P((void)); 98 void finish __P((int)); 99 void getoffset __P((char *)); 100 void loop __P((void)); 101 int main __P((int, char *[])); 102 void nolog __P((void)); 103 void timeout __P((int)); 104 void timewarn __P((int)); 105 void usage __P((void)); 106 107 int 108 main(argc, argv) 109 int argc; 110 char *argv[]; 111 { 112 char *p, *endp; 113 struct passwd *pw; 114 int arglen, ch, len, readstdin; 115 116 #ifndef DEBUG 117 if (geteuid()) { 118 (void)fprintf(stderr, "shutdown: NOT super-user\n"); 119 exit(1); 120 } 121 #endif 122 readstdin = 0; 123 while ((ch = getopt(argc, argv, "-fhknrd")) != -1) 124 switch (ch) { 125 case '-': 126 readstdin = 1; 127 break; 128 case 'f': 129 dofast = 1; 130 break; 131 case 'h': 132 dohalt = 1; 133 break; 134 case 'k': 135 killflg = 1; 136 break; 137 case 'n': 138 nosync = 1; 139 break; 140 case 'r': 141 doreboot = 1; 142 break; 143 case 'd': 144 dodump = 1; 145 break; 146 case '?': 147 default: 148 usage(); 149 } 150 argc -= optind; 151 argv += optind; 152 153 if (argc < 1) 154 usage(); 155 156 if (dofast && nosync) { 157 (void)fprintf(stderr, 158 "shutdown: incompatible switches -f and -n.\n"); 159 usage(); 160 } 161 if (doreboot && dohalt) { 162 (void)fprintf(stderr, 163 "shutdown: incompatible switches -h and -r.\n"); 164 usage(); 165 } 166 if (dodump && dohalt) { 167 (void)fprintf(stderr, 168 "shutdown: incompatible switches -h and -d.\n"); 169 usage(); 170 } 171 getoffset(*argv++); 172 173 if (*argv) { 174 for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) { 175 arglen = strlen(*argv); 176 if ((len -= arglen) <= 2) 177 break; 178 if (p != mbuf) 179 *p++ = ' '; 180 memmove(p, *argv, arglen); 181 p += arglen; 182 } 183 *p = '\n'; 184 *++p = '\0'; 185 } 186 187 if (readstdin) { 188 p = mbuf; 189 endp = mbuf + sizeof(mbuf) - 2; 190 for (;;) { 191 if (!fgets(p, endp - p + 1, stdin)) 192 break; 193 for (; *p && p < endp; ++p); 194 if (p == endp) { 195 *p = '\n'; 196 *++p = '\0'; 197 break; 198 } 199 } 200 } 201 mbuflen = strlen(mbuf); 202 203 if (offset) 204 (void)printf("Shutdown at %.24s.\n", ctime(&shuttime)); 205 else 206 (void)printf("Shutdown NOW!\n"); 207 208 if (!(whom = getlogin())) 209 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???"; 210 211 #ifdef DEBUG 212 (void)putc('\n', stdout); 213 #else 214 (void)setpriority(PRIO_PROCESS, 0, PRIO_MIN); 215 { 216 int forkpid; 217 218 forkpid = fork(); 219 if (forkpid == -1) { 220 perror("shutdown: fork"); 221 exit(1); 222 } 223 if (forkpid) { 224 (void)printf("shutdown: [pid %d]\n", forkpid); 225 exit(0); 226 } 227 } 228 #endif 229 openlog("shutdown", LOG_CONS, LOG_AUTH); 230 loop(); 231 /* NOTREACHED */ 232 #ifdef __GNUC__ 233 return 1; 234 #endif 235 } 236 237 void 238 loop() 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 (void)sleep((u_int)(offset - tp->timeleft)); 253 else { 254 while (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) != 0) { 261 if (sltime > tp->timetowait / 5) 262 timewarn(offset); 263 (void)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 (void)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 void 282 timewarn(timeleft) 283 int timeleft; 284 { 285 static int first; 286 static char hostname[MAXHOSTNAMELEN + 1]; 287 FILE *pf; 288 char wcmd[MAXPATHLEN + 4]; 289 290 if (!first++) 291 (void)gethostname(hostname, sizeof(hostname)); 292 293 /* undoc -n option to wall suppresses normal wall banner */ 294 (void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL); 295 if (!(pf = popen(wcmd, "w"))) { 296 syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL); 297 return; 298 } 299 300 (void)fprintf(pf, 301 "\007*** %sSystem shutdown message from %s@%s ***\007\n", 302 timeleft ? "": "FINAL ", whom, hostname); 303 304 if (timeleft > 10*60) 305 (void)fprintf(pf, "System going down at %5.5s\n\n", 306 ctime(&shuttime) + 11); 307 else if (timeleft > 59) 308 (void)fprintf(pf, "System going down in %d minute%s\n\n", 309 timeleft / 60, (timeleft > 60) ? "s" : ""); 310 else if (timeleft) 311 (void)fprintf(pf, "System going down in 30 seconds\n\n"); 312 else 313 (void)fprintf(pf, "System going down IMMEDIATELY\n\n"); 314 315 if (mbuflen) 316 (void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf); 317 318 /* 319 * play some games, just in case wall doesn't come back 320 * probably unecessary, given that wall is careful. 321 */ 322 if (!setjmp(alarmbuf)) { 323 (void)signal(SIGALRM, timeout); 324 (void)alarm((u_int)30); 325 (void)pclose(pf); 326 (void)alarm((u_int)0); 327 (void)signal(SIGALRM, SIG_DFL); 328 } 329 } 330 331 void 332 timeout(signo) 333 int signo; 334 { 335 longjmp(alarmbuf, 1); 336 } 337 338 void 339 die_you_gravy_sucking_pig_dog() 340 { 341 342 syslog(LOG_NOTICE, "%s by %s: %s", 343 doreboot || dodump ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf); 344 (void)sleep(2); 345 346 (void)printf("\r\nSystem shutdown time has arrived\007\007\r\n"); 347 if (killflg) { 348 (void)printf("\rbut you'll have to do it yourself\r\n"); 349 finish(0); 350 } 351 if (dofast) 352 doitfast(); 353 #ifdef DEBUG 354 if (doreboot || dodump) 355 (void)printf("reboot%s", dodump ? " -d" : ""); 356 else if (dohalt) 357 (void)printf("halt"); 358 if (nosync) 359 (void)printf(" no sync"); 360 if (dofast) 361 (void)printf(" no fsck"); 362 (void)printf("\nkill -HUP 1\n"); 363 #else 364 if (doreboot || dodump) { 365 execle(_PATH_REBOOT, "reboot", 366 dodump ? (nosync ? "-ldn" : "-ld") : 367 (nosync ? "-ln" : "-l"), 0, (char **)0); 368 syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_REBOOT); 369 perror("shutdown"); 370 } 371 else if (dohalt) { 372 execle(_PATH_HALT, "halt", nosync ? "-ln" : "-l", 373 (char *)0, (char **)0); 374 syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_HALT); 375 perror("shutdown"); 376 } 377 (void)kill(1, SIGTERM); /* to single user */ 378 #endif 379 finish(0); 380 } 381 382 #define ATOI2(p) (p[0] - '0') * 10 + (p[1] - '0'); p += 2; 383 384 void 385 getoffset(timearg) 386 char *timearg; 387 { 388 struct tm *lt; 389 char *p; 390 time_t now; 391 392 if (!strcasecmp(timearg, "now")) { /* now */ 393 offset = 0; 394 return; 395 } 396 397 (void)time(&now); 398 if (*timearg == '+') { /* +minutes */ 399 if (!isdigit(*++timearg)) 400 badtime(); 401 offset = atoi(timearg) * 60; 402 shuttime = now + offset; 403 return; 404 } 405 406 /* handle hh:mm by getting rid of the colon */ 407 for (p = timearg; *p; ++p) 408 if (!isascii(*p) || !isdigit(*p)) 409 if (*p == ':' && strlen(p) == 3) { 410 p[0] = p[1]; 411 p[1] = p[2]; 412 p[2] = '\0'; 413 } 414 else 415 badtime(); 416 417 unsetenv("TZ"); /* OUR timezone */ 418 lt = localtime(&now); /* current time val */ 419 420 switch(strlen(timearg)) { 421 case 10: 422 lt->tm_year = ATOI2(timearg); 423 /* FALLTHROUGH */ 424 case 8: 425 lt->tm_mon = ATOI2(timearg); 426 if (--lt->tm_mon < 0 || lt->tm_mon > 11) 427 badtime(); 428 /* FALLTHROUGH */ 429 case 6: 430 lt->tm_mday = ATOI2(timearg); 431 if (lt->tm_mday < 1 || lt->tm_mday > 31) 432 badtime(); 433 /* FALLTHROUGH */ 434 case 4: 435 lt->tm_hour = ATOI2(timearg); 436 if (lt->tm_hour < 0 || lt->tm_hour > 23) 437 badtime(); 438 lt->tm_min = ATOI2(timearg); 439 if (lt->tm_min < 0 || lt->tm_min > 59) 440 badtime(); 441 lt->tm_sec = 0; 442 if ((shuttime = mktime(lt)) == -1) 443 badtime(); 444 if ((offset = shuttime - now) < 0) { 445 (void)fprintf(stderr, 446 "shutdown: that time is already past.\n"); 447 exit(1); 448 } 449 break; 450 default: 451 badtime(); 452 } 453 } 454 455 #define FSMSG "fastboot file for fsck\n" 456 void 457 doitfast() 458 { 459 int fastfd; 460 461 if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC, 462 0664)) >= 0) { 463 (void)write(fastfd, FSMSG, sizeof(FSMSG) - 1); 464 (void)close(fastfd); 465 } 466 } 467 468 #define NOMSG "\n\nNO LOGINS: System going down at " 469 void 470 nolog() 471 { 472 int logfd; 473 char *ct; 474 475 (void)unlink(_PATH_NOLOGIN); /* in case linked to another file */ 476 (void)signal(SIGINT, finish); 477 (void)signal(SIGHUP, finish); 478 (void)signal(SIGQUIT, finish); 479 (void)signal(SIGTERM, finish); 480 if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC, 481 0664)) >= 0) { 482 (void)write(logfd, NOMSG, sizeof(NOMSG) - 1); 483 ct = ctime(&shuttime); 484 (void)write(logfd, ct + 11, 5); 485 (void)write(logfd, "\n\n", 2); 486 (void)write(logfd, mbuf, strlen(mbuf)); 487 (void)close(logfd); 488 } 489 } 490 491 void 492 finish(signo) 493 int signo; 494 { 495 if (!killflg) 496 (void)unlink(_PATH_NOLOGIN); 497 exit(0); 498 } 499 500 void 501 badtime() 502 { 503 (void)fprintf(stderr, "shutdown: bad time format.\n"); 504 exit(1); 505 } 506 507 void 508 usage() 509 { 510 fprintf(stderr, "usage: shutdown [-fhknrd] shutdowntime [ message ]\n"); 511 exit(1); 512 } 513