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 34 #ifndef lint 35 static char copyright[] = 36 "@(#) Copyright (c) 1988, 1990, 1993\n\ 37 The Regents of the University of California. All rights reserved.\n"; 38 #endif /* not lint */ 39 40 #ifndef lint 41 /*static char sccsid[] = "from: @(#)shutdown.c 8.2 (Berkeley) 2/16/94";*/ 42 static char *rcsid = "$Id: shutdown.c,v 1.8 1994/09/23 14:28:17 mycroft Exp $"; 43 #endif /* not lint */ 44 45 #include <sys/param.h> 46 #include <sys/time.h> 47 #include <sys/resource.h> 48 #include <sys/syslog.h> 49 50 #include <ctype.h> 51 #include <fcntl.h> 52 #include <pwd.h> 53 #include <setjmp.h> 54 #include <signal.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <tzfile.h> 59 #include <unistd.h> 60 61 #include "pathnames.h" 62 63 #ifdef DEBUG 64 #undef _PATH_NOLOGIN 65 #define _PATH_NOLOGIN "./nologin" 66 #undef _PATH_FASTBOOT 67 #define _PATH_FASTBOOT "./fastboot" 68 #endif 69 70 #define H *60*60 71 #define M *60 72 #define S *1 73 #define NOLOG_TIME 5*60 74 struct interval { 75 int timeleft, timetowait; 76 } tlist[] = { 77 10 H, 5 H, 5 H, 3 H, 2 H, 1 H, 1 H, 30 M, 78 30 M, 10 M, 20 M, 10 M, 10 M, 5 M, 5 M, 3 M, 79 2 M, 1 M, 1 M, 30 S, 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 dofast, dohalt, doreboot, killflg, mbuflen; 88 static char *nosync, *whom, mbuf[BUFSIZ]; 89 90 void badtime __P((void)); 91 void die_you_gravy_sucking_pig_dog __P((void)); 92 void doitfast __P((void)); 93 void finish __P((int)); 94 void getoffset __P((char *)); 95 void loop __P((void)); 96 void nolog __P((void)); 97 void timeout __P((int)); 98 void timewarn __P((int)); 99 void usage __P((void)); 100 101 int 102 main(argc, argv) 103 int argc; 104 char *argv[]; 105 { 106 extern int optind; 107 register char *p, *endp; 108 struct passwd *pw; 109 int arglen, ch, len, readstdin; 110 111 #ifndef DEBUG 112 if (geteuid()) { 113 (void)fprintf(stderr, "shutdown: NOT super-user\n"); 114 exit(1); 115 } 116 #endif 117 nosync = NULL; 118 readstdin = 0; 119 while ((ch = getopt(argc, argv, "-fhknr")) != EOF) 120 switch (ch) { 121 case '-': 122 readstdin = 1; 123 break; 124 case 'f': 125 dofast = 1; 126 break; 127 case 'h': 128 dohalt = 1; 129 break; 130 case 'k': 131 killflg = 1; 132 break; 133 case 'n': 134 nosync = "-n"; 135 break; 136 case 'r': 137 doreboot = 1; 138 break; 139 case '?': 140 default: 141 usage(); 142 } 143 argc -= optind; 144 argv += optind; 145 146 if (argc < 1) 147 usage(); 148 149 if (dofast && nosync) { 150 (void)fprintf(stderr, 151 "shutdown: incompatible switches -f and -n.\n"); 152 usage(); 153 } 154 if (doreboot && dohalt) { 155 (void)fprintf(stderr, 156 "shutdown: incompatible switches -h and -r.\n"); 157 usage(); 158 } 159 getoffset(*argv++); 160 161 if (*argv) { 162 for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) { 163 arglen = strlen(*argv); 164 if ((len -= arglen) <= 2) 165 break; 166 if (p != mbuf) 167 *p++ = ' '; 168 memcpy(p, *argv, arglen); 169 p += arglen; 170 } 171 *p = '\n'; 172 *++p = '\0'; 173 } 174 175 if (readstdin) { 176 p = mbuf; 177 endp = mbuf + sizeof(mbuf) - 2; 178 for (;;) { 179 if (!fgets(p, endp - p + 1, stdin)) 180 break; 181 for (; *p && p < endp; ++p); 182 if (p == endp) { 183 *p = '\n'; 184 *++p = '\0'; 185 break; 186 } 187 } 188 } 189 mbuflen = strlen(mbuf); 190 191 if (offset) 192 (void)printf("Shutdown at %.24s.\n", ctime(&shuttime)); 193 else 194 (void)printf("Shutdown NOW!\n"); 195 196 if (!(whom = getlogin())) 197 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???"; 198 199 #ifdef DEBUG 200 (void)putc('\n', stdout); 201 #else 202 (void)setpriority(PRIO_PROCESS, 0, PRIO_MIN); 203 { 204 int forkpid; 205 206 forkpid = fork(); 207 if (forkpid == -1) { 208 perror("shutdown: fork"); 209 exit(1); 210 } 211 if (forkpid) { 212 (void)printf("shutdown: [pid %d]\n", forkpid); 213 exit(0); 214 } 215 } 216 #endif 217 openlog("shutdown", LOG_CONS, LOG_AUTH); 218 loop(); 219 /* NOTREACHED */ 220 } 221 222 void 223 loop() 224 { 225 struct interval *tp; 226 u_int sltime; 227 int logged; 228 229 if (offset <= NOLOG_TIME) { 230 logged = 1; 231 nolog(); 232 } 233 else 234 logged = 0; 235 tp = tlist; 236 if (tp->timeleft < offset) 237 (void)sleep((u_int)(offset - tp->timeleft)); 238 else { 239 while (offset < tp->timeleft) 240 ++tp; 241 /* 242 * Warn now, if going to sleep more than a fifth of 243 * the next wait time. 244 */ 245 if (sltime = offset - tp->timeleft) { 246 if (sltime > tp->timetowait / 5) 247 timewarn(offset); 248 (void)sleep(sltime); 249 } 250 } 251 for (;; ++tp) { 252 timewarn(tp->timeleft); 253 if (!logged && tp->timeleft <= NOLOG_TIME) { 254 logged = 1; 255 nolog(); 256 } 257 (void)sleep((u_int)tp->timetowait); 258 if (!tp->timeleft) 259 break; 260 } 261 die_you_gravy_sucking_pig_dog(); 262 } 263 264 static jmp_buf alarmbuf; 265 266 void 267 timewarn(timeleft) 268 int timeleft; 269 { 270 static int first; 271 static char hostname[MAXHOSTNAMELEN + 1]; 272 FILE *pf; 273 char wcmd[MAXPATHLEN + 4]; 274 275 if (!first++) 276 (void)gethostname(hostname, sizeof(hostname)); 277 278 /* undoc -n option to wall suppresses normal wall banner */ 279 (void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL); 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 unecessary, 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(signo) 318 int signo; 319 { 320 longjmp(alarmbuf, 1); 321 } 322 323 void 324 die_you_gravy_sucking_pig_dog() 325 { 326 327 syslog(LOG_NOTICE, "%s by %s: %s", 328 doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf); 329 (void)sleep(2); 330 331 (void)printf("\r\nSystem shutdown time has arrived\007\007\r\n"); 332 if (killflg) { 333 (void)printf("\rbut you'll have to do it yourself\r\n"); 334 finish(0); 335 } 336 if (dofast) 337 doitfast(); 338 #ifdef DEBUG 339 if (doreboot) 340 (void)printf("reboot"); 341 else if (dohalt) 342 (void)printf("halt"); 343 if (nosync) 344 (void)printf(" no sync"); 345 if (dofast) 346 (void)printf(" no fsck"); 347 (void)printf("\nkill -HUP 1\n"); 348 #else 349 if (doreboot) { 350 execle(_PATH_REBOOT, "reboot", "-l", nosync, 0); 351 syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_REBOOT); 352 perror("shutdown"); 353 } 354 else if (dohalt) { 355 execle(_PATH_HALT, "halt", "-l", nosync, 0); 356 syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_HALT); 357 perror("shutdown"); 358 } 359 (void)kill(1, SIGTERM); /* to single user */ 360 #endif 361 finish(0); 362 } 363 364 #define ATOI2(p) (p[0] - '0') * 10 + (p[1] - '0'); p += 2; 365 366 void 367 getoffset(timearg) 368 register char *timearg; 369 { 370 register struct tm *lt; 371 register char *p; 372 time_t now; 373 374 if (!strcasecmp(timearg, "now")) { /* now */ 375 offset = 0; 376 return; 377 } 378 379 (void)time(&now); 380 if (*timearg == '+') { /* +minutes */ 381 if (!isdigit(*++timearg)) 382 badtime(); 383 offset = atoi(timearg) * 60; 384 shuttime = now + offset; 385 return; 386 } 387 388 /* handle hh:mm by getting rid of the colon */ 389 for (p = timearg; *p; ++p) 390 if (!isascii(*p) || !isdigit(*p)) 391 if (*p == ':' && strlen(p) == 3) { 392 p[0] = p[1]; 393 p[1] = p[2]; 394 p[2] = '\0'; 395 } 396 else 397 badtime(); 398 399 unsetenv("TZ"); /* OUR timezone */ 400 lt = localtime(&now); /* current time val */ 401 402 switch(strlen(timearg)) { 403 case 10: 404 lt->tm_year = ATOI2(timearg); 405 /* FALLTHROUGH */ 406 case 8: 407 lt->tm_mon = ATOI2(timearg); 408 if (--lt->tm_mon < 0 || lt->tm_mon > 11) 409 badtime(); 410 /* FALLTHROUGH */ 411 case 6: 412 lt->tm_mday = ATOI2(timearg); 413 if (lt->tm_mday < 1 || lt->tm_mday > 31) 414 badtime(); 415 /* FALLTHROUGH */ 416 case 4: 417 lt->tm_hour = ATOI2(timearg); 418 if (lt->tm_hour < 0 || lt->tm_hour > 23) 419 badtime(); 420 lt->tm_min = ATOI2(timearg); 421 if (lt->tm_min < 0 || lt->tm_min > 59) 422 badtime(); 423 lt->tm_sec = 0; 424 if ((shuttime = mktime(lt)) == -1) 425 badtime(); 426 if ((offset = shuttime - now) < 0) { 427 (void)fprintf(stderr, 428 "shutdown: that time is already past.\n"); 429 exit(1); 430 } 431 break; 432 default: 433 badtime(); 434 } 435 } 436 437 #define FSMSG "fastboot file for fsck\n" 438 void 439 doitfast() 440 { 441 int fastfd; 442 443 if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC, 444 0664)) >= 0) { 445 (void)write(fastfd, FSMSG, sizeof(FSMSG) - 1); 446 (void)close(fastfd); 447 } 448 } 449 450 #define NOMSG "\n\nNO LOGINS: System going down at " 451 void 452 nolog() 453 { 454 int logfd; 455 char *ct; 456 457 (void)unlink(_PATH_NOLOGIN); /* in case linked to another file */ 458 (void)signal(SIGINT, finish); 459 (void)signal(SIGHUP, finish); 460 (void)signal(SIGQUIT, finish); 461 (void)signal(SIGTERM, finish); 462 if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC, 463 0664)) >= 0) { 464 (void)write(logfd, NOMSG, sizeof(NOMSG) - 1); 465 ct = ctime(&shuttime); 466 (void)write(logfd, ct + 11, 5); 467 (void)write(logfd, "\n\n", 2); 468 (void)write(logfd, mbuf, strlen(mbuf)); 469 (void)close(logfd); 470 } 471 } 472 473 void 474 finish(signo) 475 int signo; 476 { 477 if (!killflg) 478 (void)unlink(_PATH_NOLOGIN); 479 exit(0); 480 } 481 482 void 483 badtime() 484 { 485 (void)fprintf(stderr, "shutdown: bad time format.\n"); 486 exit(1); 487 } 488 489 void 490 usage() 491 { 492 fprintf(stderr, "usage: shutdown [-fhknr] shutdowntime [ message ]\n"); 493 exit(1); 494 } 495