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 <unistd.h> 58 59 #include "pathnames.h" 60 61 #ifdef DEBUG 62 #undef _PATH_NOLOGIN 63 #define _PATH_NOLOGIN "./nologin" 64 #endif 65 66 #define H *60*60 67 #define M *60 68 #define S *1 69 #define NOLOG_TIME 5*60 70 struct interval { 71 int timeleft, timetowait; 72 } tlist[] = { 73 10 H, 5 H, 5 H, 3 H, 2 H, 1 H, 1 H, 30 M, 74 30 M, 10 M, 20 M, 10 M, 10 M, 5 M, 5 M, 3 M, 75 2 M, 1 M, 1 M, 30 S, 30 S, 30 S, 76 0, 0, 77 }; 78 #undef H 79 #undef M 80 #undef S 81 82 static time_t offset, shuttime; 83 static int dohalt, doreboot, killflg, mbuflen; 84 static char *nosync, *whom, mbuf[BUFSIZ]; 85 86 void badtime __P((void)); 87 void die_you_gravy_sucking_pig_dog __P((void)); 88 void finish __P((int)); 89 void getoffset __P((char *)); 90 void loop __P((void)); 91 void nolog __P((void)); 92 void timeout __P((int)); 93 void timewarn __P((int)); 94 void usage __P((void)); 95 96 int 97 main(argc, argv) 98 int argc; 99 char *argv[]; 100 { 101 extern int optind; 102 register char *p, *endp; 103 struct passwd *pw; 104 int arglen, ch, len, readstdin; 105 106 #ifndef DEBUG 107 if (geteuid()) { 108 (void)fprintf(stderr, "shutdown: NOT super-user\n"); 109 exit(1); 110 } 111 #endif 112 nosync = NULL; 113 readstdin = 0; 114 while ((ch = getopt(argc, argv, "-hknr")) != EOF) 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 'r': 129 doreboot = 1; 130 break; 131 case '?': 132 default: 133 usage(); 134 } 135 argc -= optind; 136 argv += optind; 137 138 if (argc < 1) 139 usage(); 140 141 if (doreboot && dohalt) { 142 (void)fprintf(stderr, 143 "shutdown: incompatible switches -h and -r.\n"); 144 usage(); 145 } 146 getoffset(*argv++); 147 148 if (*argv) { 149 for (p = mbuf, len = sizeof(mbuf); *argv; ++argv) { 150 arglen = strlen(*argv); 151 if ((len -= arglen) <= 2) 152 break; 153 if (p != mbuf) 154 *p++ = ' '; 155 bcopy(*argv, p, arglen); 156 p += arglen; 157 } 158 *p = '\n'; 159 *++p = '\0'; 160 } 161 162 if (readstdin) { 163 p = mbuf; 164 endp = mbuf + sizeof(mbuf) - 2; 165 for (;;) { 166 if (!fgets(p, endp - p + 1, stdin)) 167 break; 168 for (; *p && p < endp; ++p); 169 if (p == endp) { 170 *p = '\n'; 171 *++p = '\0'; 172 break; 173 } 174 } 175 } 176 mbuflen = strlen(mbuf); 177 178 if (offset) 179 (void)printf("Shutdown at %.24s.\n", ctime(&shuttime)); 180 else 181 (void)printf("Shutdown NOW!\n"); 182 183 if (!(whom = getlogin())) 184 whom = (pw = getpwuid(getuid())) ? pw->pw_name : "???"; 185 186 #ifdef DEBUG 187 (void)putc('\n', stdout); 188 #else 189 (void)setpriority(PRIO_PROCESS, 0, PRIO_MIN); 190 { 191 int forkpid; 192 193 forkpid = fork(); 194 if (forkpid == -1) { 195 perror("shutdown: fork"); 196 exit(1); 197 } 198 if (forkpid) { 199 (void)printf("shutdown: [pid %d]\n", forkpid); 200 exit(0); 201 } 202 } 203 #endif 204 openlog("shutdown", LOG_CONS, LOG_AUTH); 205 loop(); 206 /* NOTREACHED */ 207 } 208 209 void 210 loop() 211 { 212 struct interval *tp; 213 u_int sltime; 214 int logged; 215 216 if (offset <= NOLOG_TIME) { 217 logged = 1; 218 nolog(); 219 } 220 else 221 logged = 0; 222 tp = tlist; 223 if (tp->timeleft < offset) 224 (void)sleep((u_int)(offset - tp->timeleft)); 225 else { 226 while (offset < tp->timeleft) 227 ++tp; 228 /* 229 * Warn now, if going to sleep more than a fifth of 230 * the next wait time. 231 */ 232 if (sltime = offset - tp->timeleft) { 233 if (sltime > tp->timetowait / 5) 234 timewarn(offset); 235 (void)sleep(sltime); 236 } 237 } 238 for (;; ++tp) { 239 timewarn(tp->timeleft); 240 if (!logged && tp->timeleft <= NOLOG_TIME) { 241 logged = 1; 242 nolog(); 243 } 244 (void)sleep((u_int)tp->timetowait); 245 if (!tp->timeleft) 246 break; 247 } 248 die_you_gravy_sucking_pig_dog(); 249 } 250 251 static jmp_buf alarmbuf; 252 253 void 254 timewarn(timeleft) 255 int timeleft; 256 { 257 static int first; 258 static char hostname[MAXHOSTNAMELEN + 1]; 259 FILE *pf; 260 char wcmd[MAXPATHLEN + 4]; 261 262 if (!first++) 263 (void)gethostname(hostname, sizeof(hostname)); 264 265 /* undoc -n option to wall suppresses normal wall banner */ 266 (void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL); 267 if (!(pf = popen(wcmd, "w"))) { 268 syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL); 269 return; 270 } 271 272 (void)fprintf(pf, 273 "\007*** %sSystem shutdown message from %s@%s ***\007\n", 274 timeleft ? "": "FINAL ", whom, hostname); 275 276 if (timeleft > 10*60) 277 (void)fprintf(pf, "System going down at %5.5s\n\n", 278 ctime(&shuttime) + 11); 279 else if (timeleft > 59) 280 (void)fprintf(pf, "System going down in %d minute%s\n\n", 281 timeleft / 60, (timeleft > 60) ? "s" : ""); 282 else if (timeleft) 283 (void)fprintf(pf, "System going down in 30 seconds\n\n"); 284 else 285 (void)fprintf(pf, "System going down IMMEDIATELY\n\n"); 286 287 if (mbuflen) 288 (void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf); 289 290 /* 291 * play some games, just in case wall doesn't come back 292 * probably unecessary, given that wall is careful. 293 */ 294 if (!setjmp(alarmbuf)) { 295 (void)signal(SIGALRM, timeout); 296 (void)alarm((u_int)30); 297 (void)pclose(pf); 298 (void)alarm((u_int)0); 299 (void)signal(SIGALRM, SIG_DFL); 300 } 301 } 302 303 void 304 timeout(signo) 305 int signo; 306 { 307 longjmp(alarmbuf, 1); 308 } 309 310 void 311 die_you_gravy_sucking_pig_dog() 312 { 313 314 syslog(LOG_NOTICE, "%s by %s: %s", 315 doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf); 316 (void)sleep(2); 317 318 (void)printf("\r\nSystem shutdown time has arrived\007\007\r\n"); 319 if (killflg) { 320 (void)printf("\rbut you'll have to do it yourself\r\n"); 321 exit(0); 322 } 323 #ifdef DEBUG 324 if (doreboot) 325 (void)printf("reboot"); 326 else if (dohalt) 327 (void)printf("halt"); 328 if (nosync) 329 (void)printf(" no sync"); 330 (void)printf("\nkill -HUP 1\n"); 331 #else 332 if (doreboot) { 333 execle(_PATH_REBOOT, "reboot", "-l", nosync, 0); 334 syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_REBOOT); 335 perror("shutdown"); 336 } 337 else if (dohalt) { 338 execle(_PATH_HALT, "halt", "-l", nosync, 0); 339 syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_HALT); 340 perror("shutdown"); 341 } 342 (void)kill(1, SIGTERM); /* to single user */ 343 #endif 344 finish(0); 345 } 346 347 #define ATOI2(p) (p[0] - '0') * 10 + (p[1] - '0'); p += 2; 348 349 void 350 getoffset(timearg) 351 register char *timearg; 352 { 353 register struct tm *lt; 354 register char *p; 355 time_t now; 356 357 if (!strcasecmp(timearg, "now")) { /* now */ 358 offset = 0; 359 return; 360 } 361 362 (void)time(&now); 363 if (*timearg == '+') { /* +minutes */ 364 if (!isdigit(*++timearg)) 365 badtime(); 366 offset = atoi(timearg) * 60; 367 shuttime = now + offset; 368 return; 369 } 370 371 /* handle hh:mm by getting rid of the colon */ 372 for (p = timearg; *p; ++p) 373 if (!isascii(*p) || !isdigit(*p)) 374 if (*p == ':' && strlen(p) == 3) { 375 p[0] = p[1]; 376 p[1] = p[2]; 377 p[2] = '\0'; 378 } 379 else 380 badtime(); 381 382 unsetenv("TZ"); /* OUR timezone */ 383 lt = localtime(&now); /* current time val */ 384 385 switch(strlen(timearg)) { 386 case 10: 387 lt->tm_year = ATOI2(timearg); 388 /* FALLTHROUGH */ 389 case 8: 390 lt->tm_mon = ATOI2(timearg); 391 if (--lt->tm_mon < 0 || lt->tm_mon > 11) 392 badtime(); 393 /* FALLTHROUGH */ 394 case 6: 395 lt->tm_mday = ATOI2(timearg); 396 if (lt->tm_mday < 1 || lt->tm_mday > 31) 397 badtime(); 398 /* FALLTHROUGH */ 399 case 4: 400 lt->tm_hour = ATOI2(timearg); 401 if (lt->tm_hour < 0 || lt->tm_hour > 23) 402 badtime(); 403 lt->tm_min = ATOI2(timearg); 404 if (lt->tm_min < 0 || lt->tm_min > 59) 405 badtime(); 406 lt->tm_sec = 0; 407 if ((shuttime = mktime(lt)) == -1) 408 badtime(); 409 if ((offset = shuttime - now) < 0) { 410 (void)fprintf(stderr, 411 "shutdown: that time is already past.\n"); 412 exit(1); 413 } 414 break; 415 default: 416 badtime(); 417 } 418 } 419 420 #define NOMSG "\n\nNO LOGINS: System going down at " 421 void 422 nolog() 423 { 424 int logfd; 425 char *ct; 426 427 (void)unlink(_PATH_NOLOGIN); /* in case linked to another file */ 428 (void)signal(SIGINT, finish); 429 (void)signal(SIGHUP, finish); 430 (void)signal(SIGQUIT, finish); 431 (void)signal(SIGTERM, finish); 432 if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC, 433 0664)) >= 0) { 434 (void)write(logfd, NOMSG, sizeof(NOMSG) - 1); 435 ct = ctime(&shuttime); 436 (void)write(logfd, ct + 11, 5); 437 (void)write(logfd, "\n\n", 2); 438 (void)write(logfd, mbuf, strlen(mbuf)); 439 (void)close(logfd); 440 } 441 } 442 443 void 444 finish(signo) 445 int signo; 446 { 447 (void)unlink(_PATH_NOLOGIN); 448 exit(0); 449 } 450 451 void 452 badtime() 453 { 454 (void)fprintf(stderr, "shutdown: bad time format.\n"); 455 exit(1); 456 } 457 458 void 459 usage() 460 { 461 fprintf(stderr, "usage: shutdown [-hknr] shutdowntime [ message ]\n"); 462 exit(1); 463 } 464