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[] = "@(#)shutdown.c 8.2 (Berkeley) 2/16/94"; 42 #endif /* not lint */ 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 <fcntl.h> 51 #include <pwd.h> 52 #include <setjmp.h> 53 #include <signal.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <tzfile.h> 58 #include <unistd.h> 59 60 #include "pathnames.h" 61 62 #ifdef DEBUG 63 #undef _PATH_NOLOGIN 64 #define _PATH_NOLOGIN "./nologin" 65 #undef _PATH_FASTBOOT 66 #define _PATH_FASTBOOT "./fastboot" 67 #endif 68 69 #define H *60*60 70 #define M *60 71 #define S *1 72 #define NOLOG_TIME 5*60 73 struct interval { 74 int timeleft, timetowait; 75 } tlist[] = { 76 10 H, 5 H, 5 H, 3 H, 2 H, 1 H, 1 H, 30 M, 77 30 M, 10 M, 20 M, 10 M, 10 M, 5 M, 5 M, 3 M, 78 2 M, 1 M, 1 M, 30 S, 30 S, 30 S, 79 0, 0, 80 }; 81 #undef H 82 #undef M 83 #undef S 84 85 static time_t offset, shuttime; 86 static int dofast, dohalt, doreboot, killflg, mbuflen; 87 static char *nosync, *whom, mbuf[BUFSIZ]; 88 89 void badtime __P((void)); 90 void die_you_gravy_sucking_pig_dog __P((void)); 91 void doitfast __P((void)); 92 void finish __P((int)); 93 void getoffset __P((char *)); 94 void loop __P((void)); 95 void nolog __P((void)); 96 void timeout __P((int)); 97 void timewarn __P((int)); 98 void usage __P((void)); 99 100 int 101 main(argc, argv) 102 int argc; 103 char *argv[]; 104 { 105 extern int optind; 106 register char *p, *endp; 107 struct passwd *pw; 108 int arglen, ch, len, readstdin; 109 110 #ifndef DEBUG 111 if (geteuid()) { 112 (void)fprintf(stderr, "shutdown: NOT super-user\n"); 113 exit(1); 114 } 115 #endif 116 nosync = NULL; 117 readstdin = 0; 118 while ((ch = getopt(argc, argv, "-fhknr")) != EOF) 119 switch (ch) { 120 case '-': 121 readstdin = 1; 122 break; 123 case 'f': 124 dofast = 1; 125 break; 126 case 'h': 127 dohalt = 1; 128 break; 129 case 'k': 130 killflg = 1; 131 break; 132 case 'n': 133 nosync = "-n"; 134 break; 135 case 'r': 136 doreboot = 1; 137 break; 138 case '?': 139 default: 140 usage(); 141 } 142 argc -= optind; 143 argv += optind; 144 145 if (argc < 1) 146 usage(); 147 148 if (dofast && nosync) { 149 (void)fprintf(stderr, 150 "shutdown: incompatible switches -f and -n.\n"); 151 usage(); 152 } 153 if (doreboot && dohalt) { 154 (void)fprintf(stderr, 155 "shutdown: incompatible switches -h and -r.\n"); 156 usage(); 157 } 158 getoffset(*argv++); 159 160 if (*argv) { 161 for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) { 162 arglen = strlen(*argv); 163 if ((len -= arglen) <= 2) 164 break; 165 if (p != mbuf) 166 *p++ = ' '; 167 bcopy(*argv, p, arglen); 168 p += arglen; 169 } 170 *p = '\n'; 171 *++p = '\0'; 172 } 173 174 if (readstdin) { 175 p = mbuf; 176 endp = mbuf + sizeof(mbuf) - 2; 177 for (;;) { 178 if (!fgets(p, endp - p + 1, stdin)) 179 break; 180 for (; *p && p < endp; ++p); 181 if (p == endp) { 182 *p = '\n'; 183 *++p = '\0'; 184 break; 185 } 186 } 187 } 188 mbuflen = strlen(mbuf); 189 190 if (offset) 191 (void)printf("Shutdown at %.24s.\n", ctime(&shuttime)); 192 else 193 (void)printf("Shutdown NOW!\n"); 194 195 if (!(whom = getlogin())) 196 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???"; 197 198 #ifdef DEBUG 199 (void)putc('\n', stdout); 200 #else 201 (void)setpriority(PRIO_PROCESS, 0, PRIO_MIN); 202 { 203 int forkpid; 204 205 forkpid = fork(); 206 if (forkpid == -1) { 207 perror("shutdown: fork"); 208 exit(1); 209 } 210 if (forkpid) { 211 (void)printf("shutdown: [pid %d]\n", forkpid); 212 exit(0); 213 } 214 } 215 #endif 216 openlog("shutdown", LOG_CONS, LOG_AUTH); 217 loop(); 218 /* NOTREACHED */ 219 } 220 221 void 222 loop() 223 { 224 struct interval *tp; 225 u_int sltime; 226 int logged; 227 228 if (offset <= NOLOG_TIME) { 229 logged = 1; 230 nolog(); 231 } 232 else 233 logged = 0; 234 tp = tlist; 235 if (tp->timeleft < offset) 236 (void)sleep((u_int)(offset - tp->timeleft)); 237 else { 238 while (offset < tp->timeleft) 239 ++tp; 240 /* 241 * Warn now, if going to sleep more than a fifth of 242 * the next wait time. 243 */ 244 if (sltime = offset - tp->timeleft) { 245 if (sltime > tp->timetowait / 5) 246 timewarn(offset); 247 (void)sleep(sltime); 248 } 249 } 250 for (;; ++tp) { 251 timewarn(tp->timeleft); 252 if (!logged && tp->timeleft <= NOLOG_TIME) { 253 logged = 1; 254 nolog(); 255 } 256 (void)sleep((u_int)tp->timetowait); 257 if (!tp->timeleft) 258 break; 259 } 260 die_you_gravy_sucking_pig_dog(); 261 } 262 263 static jmp_buf alarmbuf; 264 265 void 266 timewarn(timeleft) 267 int timeleft; 268 { 269 static int first; 270 static char hostname[MAXHOSTNAMELEN + 1]; 271 FILE *pf; 272 char wcmd[MAXPATHLEN + 4]; 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 if (!(pf = popen(wcmd, "w"))) { 280 syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL); 281 return; 282 } 283 284 (void)fprintf(pf, 285 "\007*** %sSystem shutdown message from %s@%s ***\007\n", 286 timeleft ? "": "FINAL ", whom, hostname); 287 288 if (timeleft > 10*60) 289 (void)fprintf(pf, "System going down at %5.5s\n\n", 290 ctime(&shuttime) + 11); 291 else if (timeleft > 59) 292 (void)fprintf(pf, "System going down in %d minute%s\n\n", 293 timeleft / 60, (timeleft > 60) ? "s" : ""); 294 else if (timeleft) 295 (void)fprintf(pf, "System going down in 30 seconds\n\n"); 296 else 297 (void)fprintf(pf, "System going down IMMEDIATELY\n\n"); 298 299 if (mbuflen) 300 (void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf); 301 302 /* 303 * play some games, just in case wall doesn't come back 304 * probably unecessary, given that wall is careful. 305 */ 306 if (!setjmp(alarmbuf)) { 307 (void)signal(SIGALRM, timeout); 308 (void)alarm((u_int)30); 309 (void)pclose(pf); 310 (void)alarm((u_int)0); 311 (void)signal(SIGALRM, SIG_DFL); 312 } 313 } 314 315 void 316 timeout(signo) 317 int signo; 318 { 319 longjmp(alarmbuf, 1); 320 } 321 322 void 323 die_you_gravy_sucking_pig_dog() 324 { 325 326 syslog(LOG_NOTICE, "%s by %s: %s", 327 doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf); 328 (void)sleep(2); 329 330 (void)printf("\r\nSystem shutdown time has arrived\007\007\r\n"); 331 if (killflg) { 332 (void)printf("\rbut you'll have to do it yourself\r\n"); 333 exit(0); 334 } 335 if (dofast) 336 doitfast(); 337 #ifdef DEBUG 338 if (doreboot) 339 (void)printf("reboot"); 340 else if (dohalt) 341 (void)printf("halt"); 342 if (nosync) 343 (void)printf(" no sync"); 344 if (dofast) 345 (void)printf(" no fsck"); 346 (void)printf("\nkill -HUP 1\n"); 347 #else 348 if (doreboot) { 349 execle(_PATH_REBOOT, "reboot", "-l", nosync, 0); 350 syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_REBOOT); 351 perror("shutdown"); 352 } 353 else if (dohalt) { 354 execle(_PATH_HALT, "halt", "-l", nosync, 0); 355 syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_HALT); 356 perror("shutdown"); 357 } 358 (void)kill(1, SIGTERM); /* to single user */ 359 #endif 360 finish(0); 361 } 362 363 #define ATOI2(p) (p[0] - '0') * 10 + (p[1] - '0'); p += 2; 364 365 void 366 getoffset(timearg) 367 register char *timearg; 368 { 369 register struct tm *lt; 370 register char *p; 371 time_t now; 372 373 if (!strcasecmp(timearg, "now")) { /* now */ 374 offset = 0; 375 return; 376 } 377 378 (void)time(&now); 379 if (*timearg == '+') { /* +minutes */ 380 if (!isdigit(*++timearg)) 381 badtime(); 382 offset = atoi(timearg) * 60; 383 shuttime = now + offset; 384 return; 385 } 386 387 /* handle hh:mm by getting rid of the colon */ 388 for (p = timearg; *p; ++p) 389 if (!isascii(*p) || !isdigit(*p)) 390 if (*p == ':' && strlen(p) == 3) { 391 p[0] = p[1]; 392 p[1] = p[2]; 393 p[2] = '\0'; 394 } 395 else 396 badtime(); 397 398 unsetenv("TZ"); /* OUR timezone */ 399 lt = localtime(&now); /* current time val */ 400 401 switch(strlen(timearg)) { 402 case 10: 403 lt->tm_year = ATOI2(timearg); 404 /* FALLTHROUGH */ 405 case 8: 406 lt->tm_mon = ATOI2(timearg); 407 if (--lt->tm_mon < 0 || lt->tm_mon > 11) 408 badtime(); 409 /* FALLTHROUGH */ 410 case 6: 411 lt->tm_mday = ATOI2(timearg); 412 if (lt->tm_mday < 1 || lt->tm_mday > 31) 413 badtime(); 414 /* FALLTHROUGH */ 415 case 4: 416 lt->tm_hour = ATOI2(timearg); 417 if (lt->tm_hour < 0 || lt->tm_hour > 23) 418 badtime(); 419 lt->tm_min = ATOI2(timearg); 420 if (lt->tm_min < 0 || lt->tm_min > 59) 421 badtime(); 422 lt->tm_sec = 0; 423 if ((shuttime = mktime(lt)) == -1) 424 badtime(); 425 if ((offset = shuttime - now) < 0) { 426 (void)fprintf(stderr, 427 "shutdown: that time is already past.\n"); 428 exit(1); 429 } 430 break; 431 default: 432 badtime(); 433 } 434 } 435 436 #define FSMSG "fastboot file for fsck\n" 437 void 438 doitfast() 439 { 440 int fastfd; 441 442 if ((fastfd = open(_PATH_FASTBOOT, O_WRONLY|O_CREAT|O_TRUNC, 443 0664)) >= 0) { 444 (void)write(fastfd, FSMSG, sizeof(FSMSG) - 1); 445 (void)close(fastfd); 446 } 447 } 448 449 #define NOMSG "\n\nNO LOGINS: System going down at " 450 void 451 nolog() 452 { 453 int logfd; 454 char *ct; 455 456 (void)unlink(_PATH_NOLOGIN); /* in case linked to another file */ 457 (void)signal(SIGINT, finish); 458 (void)signal(SIGHUP, finish); 459 (void)signal(SIGQUIT, finish); 460 (void)signal(SIGTERM, finish); 461 if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC, 462 0664)) >= 0) { 463 (void)write(logfd, NOMSG, sizeof(NOMSG) - 1); 464 ct = ctime(&shuttime); 465 (void)write(logfd, ct + 11, 5); 466 (void)write(logfd, "\n\n", 2); 467 (void)write(logfd, mbuf, strlen(mbuf)); 468 (void)close(logfd); 469 } 470 } 471 472 void 473 finish(signo) 474 int signo; 475 { 476 (void)unlink(_PATH_NOLOGIN); 477 exit(0); 478 } 479 480 void 481 badtime() 482 { 483 (void)fprintf(stderr, "shutdown: bad time format.\n"); 484 exit(1); 485 } 486 487 void 488 usage() 489 { 490 fprintf(stderr, "usage: shutdown [-fhknr] shutdowntime [ message ]\n"); 491 exit(1); 492 } 493