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 const 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 #if 0 42 static char sccsid[] = "@(#)shutdown.c 8.4 (Berkeley) 4/28/95"; 43 #endif 44 static const char rcsid[] = 45 "$Id: shutdown.c,v 1.15 1998/12/11 11:04:19 bde Exp $"; 46 #endif /* not lint */ 47 48 #include <sys/param.h> 49 #include <sys/time.h> 50 #include <sys/resource.h> 51 #include <sys/syslog.h> 52 53 #include <ctype.h> 54 #include <err.h> 55 #include <fcntl.h> 56 #include <pwd.h> 57 #include <setjmp.h> 58 #include <signal.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include <unistd.h> 63 64 #include "pathnames.h" 65 66 #ifdef DEBUG 67 #undef _PATH_NOLOGIN 68 #define _PATH_NOLOGIN "./nologin" 69 #endif 70 71 #define H *60*60 72 #define M *60 73 #define S *1 74 #define NOLOG_TIME 5*60 75 struct interval { 76 int timeleft, timetowait; 77 } tlist[] = { 78 { 10 H, 5 H }, 79 { 5 H, 3 H }, 80 { 2 H, 1 H }, 81 { 1 H, 30 M }, 82 { 30 M, 10 M }, 83 { 20 M, 10 M }, 84 { 10 M, 5 M }, 85 { 5 M, 3 M }, 86 { 2 M, 1 M }, 87 { 1 M, 30 S }, 88 { 30 S, 30 S }, 89 { 0 , 0 } 90 }; 91 #undef H 92 #undef M 93 #undef S 94 95 static time_t offset, shuttime; 96 static int dohalt, dopower, doreboot, killflg, mbuflen; 97 static char *nosync, *whom, mbuf[BUFSIZ]; 98 99 void badtime __P((void)); 100 void die_you_gravy_sucking_pig_dog __P((void)); 101 void finish __P((int)); 102 void getoffset __P((char *)); 103 void loop __P((void)); 104 void nolog __P((void)); 105 void timeout __P((int)); 106 void timewarn __P((int)); 107 void usage __P((void)); 108 109 int 110 main(argc, argv) 111 int argc; 112 char *argv[]; 113 { 114 register char *p, *endp; 115 struct passwd *pw; 116 int arglen, ch, len, readstdin; 117 118 #ifndef DEBUG 119 if (geteuid()) 120 errx(1, "NOT super-user"); 121 #endif 122 nosync = NULL; 123 readstdin = 0; 124 while ((ch = getopt(argc, argv, "-hknpr")) != -1) 125 switch (ch) { 126 case '-': 127 readstdin = 1; 128 break; 129 case 'h': 130 dohalt = 1; 131 break; 132 case 'k': 133 killflg = 1; 134 break; 135 case 'n': 136 nosync = "-n"; 137 break; 138 case 'p': 139 dopower = 1; 140 break; 141 case 'r': 142 doreboot = 1; 143 break; 144 case '?': 145 default: 146 usage(); 147 } 148 argc -= optind; 149 argv += optind; 150 151 if (argc < 1) 152 usage(); 153 154 if (doreboot + dohalt + dopower > 1) { 155 warnx("incompatible switches -h, -p and -r"); 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 memmove(p, *argv, 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 err(1, "fork"); 208 if (forkpid) 209 errx(0, "[pid %d]", forkpid); 210 } 211 setsid(); 212 #endif 213 openlog("shutdown", LOG_CONS, LOG_AUTH); 214 loop(); 215 return(0); 216 } 217 218 void 219 loop() 220 { 221 struct interval *tp; 222 u_int sltime; 223 int logged; 224 225 if (offset <= NOLOG_TIME) { 226 logged = 1; 227 nolog(); 228 } 229 else 230 logged = 0; 231 tp = tlist; 232 if (tp->timeleft < offset) 233 (void)sleep((u_int)(offset - tp->timeleft)); 234 else { 235 while (offset < tp->timeleft) 236 ++tp; 237 /* 238 * Warn now, if going to sleep more than a fifth of 239 * the next wait time. 240 */ 241 if ((sltime = offset - tp->timeleft)) { 242 if (sltime > tp->timetowait / 5) 243 timewarn(offset); 244 (void)sleep(sltime); 245 } 246 } 247 for (;; ++tp) { 248 timewarn(tp->timeleft); 249 if (!logged && tp->timeleft <= NOLOG_TIME) { 250 logged = 1; 251 nolog(); 252 } 253 (void)sleep((u_int)tp->timetowait); 254 if (!tp->timeleft) 255 break; 256 } 257 die_you_gravy_sucking_pig_dog(); 258 } 259 260 static jmp_buf alarmbuf; 261 262 static char *restricted_environ[] = { 263 "PATH=" _PATH_STDPATH, 264 NULL 265 }; 266 267 void 268 timewarn(timeleft) 269 int timeleft; 270 { 271 static int first; 272 static char hostname[MAXHOSTNAMELEN + 1]; 273 FILE *pf; 274 char wcmd[MAXPATHLEN + 4]; 275 extern char **environ; 276 277 if (!first++) 278 (void)gethostname(hostname, sizeof(hostname)); 279 280 /* undoc -n option to wall suppresses normal wall banner */ 281 (void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL); 282 environ = restricted_environ; 283 if (!(pf = popen(wcmd, "w"))) { 284 syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL); 285 return; 286 } 287 288 (void)fprintf(pf, 289 "\007*** %sSystem shutdown message from %s@%s ***\007\n", 290 timeleft ? "": "FINAL ", whom, hostname); 291 292 if (timeleft > 10*60) 293 (void)fprintf(pf, "System going down at %5.5s\n\n", 294 ctime(&shuttime) + 11); 295 else if (timeleft > 59) 296 (void)fprintf(pf, "System going down in %d minute%s\n\n", 297 timeleft / 60, (timeleft > 60) ? "s" : ""); 298 else if (timeleft) 299 (void)fprintf(pf, "System going down in 30 seconds\n\n"); 300 else 301 (void)fprintf(pf, "System going down IMMEDIATELY\n\n"); 302 303 if (mbuflen) 304 (void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf); 305 306 /* 307 * play some games, just in case wall doesn't come back 308 * probably unnecessary, given that wall is careful. 309 */ 310 if (!setjmp(alarmbuf)) { 311 (void)signal(SIGALRM, timeout); 312 (void)alarm((u_int)30); 313 (void)pclose(pf); 314 (void)alarm((u_int)0); 315 (void)signal(SIGALRM, SIG_DFL); 316 } 317 } 318 319 void 320 timeout(signo) 321 int signo; 322 { 323 longjmp(alarmbuf, 1); 324 } 325 326 void 327 die_you_gravy_sucking_pig_dog() 328 { 329 char *empty_environ[] = { NULL }; 330 331 syslog(LOG_NOTICE, "%s by %s: %s", 332 doreboot ? "reboot" : dohalt ? "halt" : dopower ? "power-down" : 333 "shutdown", whom, mbuf); 334 (void)sleep(2); 335 336 (void)printf("\r\nSystem shutdown time has arrived\007\007\r\n"); 337 if (killflg) { 338 (void)printf("\rbut you'll have to do it yourself\r\n"); 339 exit(0); 340 } 341 #ifdef DEBUG 342 if (doreboot) 343 (void)printf("reboot"); 344 else if (dohalt) 345 (void)printf("halt"); 346 else if (dopower) 347 (void)printf("power-down"); 348 if (nosync) 349 (void)printf(" no sync"); 350 (void)printf("\nkill -HUP 1\n"); 351 #else 352 if (doreboot) { 353 execle(_PATH_REBOOT, "reboot", "-l", nosync, 354 (char *)NULL, empty_environ); 355 syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_REBOOT); 356 warn(_PATH_REBOOT); 357 } 358 else if (dohalt) { 359 execle(_PATH_HALT, "halt", "-l", nosync, 360 (char *)NULL, empty_environ); 361 syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_HALT); 362 warn(_PATH_HALT); 363 } 364 else if (dopower) { 365 execle(_PATH_HALT, "halt", "-l", "-p", nosync, 366 (char *)NULL, empty_environ); 367 syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_HALT); 368 warn(_PATH_HALT); 369 } 370 (void)kill(1, SIGTERM); /* to single user */ 371 #endif 372 finish(0); 373 } 374 375 #define ATOI2(p) (p[0] - '0') * 10 + (p[1] - '0'); p += 2; 376 377 void 378 getoffset(timearg) 379 register char *timearg; 380 { 381 register struct tm *lt; 382 register char *p; 383 time_t now; 384 int this_year; 385 386 if (!strcasecmp(timearg, "now")) { /* now */ 387 offset = 0; 388 return; 389 } 390 391 (void)time(&now); 392 if (*timearg == '+') { /* +minutes */ 393 if (!isdigit(*++timearg)) 394 badtime(); 395 offset = atoi(timearg) * 60; 396 shuttime = now + offset; 397 return; 398 } 399 400 /* handle hh:mm by getting rid of the colon */ 401 for (p = timearg; *p; ++p) 402 if (!isascii(*p) || !isdigit(*p)) 403 if (*p == ':' && strlen(p) == 3) { 404 p[0] = p[1]; 405 p[1] = p[2]; 406 p[2] = '\0'; 407 } 408 else 409 badtime(); 410 411 unsetenv("TZ"); /* OUR timezone */ 412 lt = localtime(&now); /* current time val */ 413 414 switch(strlen(timearg)) { 415 case 10: 416 this_year = lt->tm_year; 417 lt->tm_year = ATOI2(timearg); 418 /* 419 * check if the specified year is in the next century. 420 * allow for one year of user error as many people will 421 * enter n - 1 at the start of year n. 422 */ 423 if (lt->tm_year < (this_year % 100) - 1) 424 lt->tm_year += 100; 425 /* adjust for the year 2000 and beyond */ 426 lt->tm_year += (this_year - (this_year % 100)); 427 /* FALLTHROUGH */ 428 case 8: 429 lt->tm_mon = ATOI2(timearg); 430 if (--lt->tm_mon < 0 || lt->tm_mon > 11) 431 badtime(); 432 /* FALLTHROUGH */ 433 case 6: 434 lt->tm_mday = ATOI2(timearg); 435 if (lt->tm_mday < 1 || lt->tm_mday > 31) 436 badtime(); 437 /* FALLTHROUGH */ 438 case 4: 439 lt->tm_hour = ATOI2(timearg); 440 if (lt->tm_hour < 0 || lt->tm_hour > 23) 441 badtime(); 442 lt->tm_min = ATOI2(timearg); 443 if (lt->tm_min < 0 || lt->tm_min > 59) 444 badtime(); 445 lt->tm_sec = 0; 446 if ((shuttime = mktime(lt)) == -1) 447 badtime(); 448 if ((offset = shuttime - now) < 0) 449 errx(1, "that time is already past."); 450 break; 451 default: 452 badtime(); 453 } 454 } 455 456 #define NOMSG "\n\nNO LOGINS: System going down at " 457 void 458 nolog() 459 { 460 int logfd; 461 char *ct; 462 463 (void)unlink(_PATH_NOLOGIN); /* in case linked to another file */ 464 (void)signal(SIGINT, finish); 465 (void)signal(SIGHUP, finish); 466 (void)signal(SIGQUIT, finish); 467 (void)signal(SIGTERM, finish); 468 if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC, 469 0664)) >= 0) { 470 (void)write(logfd, NOMSG, sizeof(NOMSG) - 1); 471 ct = ctime(&shuttime); 472 (void)write(logfd, ct + 11, 5); 473 (void)write(logfd, "\n\n", 2); 474 (void)write(logfd, mbuf, strlen(mbuf)); 475 (void)close(logfd); 476 } 477 } 478 479 void 480 finish(signo) 481 int signo; 482 { 483 if (!killflg) 484 (void)unlink(_PATH_NOLOGIN); 485 exit(0); 486 } 487 488 void 489 badtime() 490 { 491 errx(1, "bad time format"); 492 } 493 494 void 495 usage() 496 { 497 fprintf(stderr, 498 "usage: shutdown [-] [-hknpr] time [warning-message ...]\n"); 499 exit(1); 500 } 501