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 * $Id$ 34 */ 35 36 #ifndef lint 37 static char copyright[] = 38 "@(#) 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 static char sccsid[] = "@(#)shutdown.c 8.2 (Berkeley) 2/16/94"; 44 #endif /* not lint */ 45 46 #include <sys/param.h> 47 #include <sys/time.h> 48 #include <sys/resource.h> 49 #include <sys/syslog.h> 50 51 #include <ctype.h> 52 #include <fcntl.h> 53 #include <pwd.h> 54 #include <setjmp.h> 55 #include <signal.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <string.h> 59 #include <unistd.h> 60 #include <err.h> 61 62 #include "pathnames.h" 63 64 #ifdef DEBUG 65 #undef _PATH_NOLOGIN 66 #define _PATH_NOLOGIN "./nologin" 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 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 finish __P((int)); 92 void getoffset __P((char *)); 93 void loop __P((void)); 94 void nolog __P((void)); 95 void timeout __P((int)); 96 void timewarn __P((int)); 97 void usage __P((void)); 98 99 int 100 main(argc, argv) 101 int argc; 102 char *argv[]; 103 { 104 extern int optind; 105 register char *p, *endp; 106 struct passwd *pw; 107 int arglen, ch, len, readstdin; 108 109 #ifndef DEBUG 110 if (geteuid()) 111 errx(1, "NOT super-user"); 112 #endif 113 nosync = NULL; 114 readstdin = 0; 115 while ((ch = getopt(argc, argv, "-hknr")) != -1) 116 switch (ch) { 117 case '-': 118 readstdin = 1; 119 break; 120 case 'h': 121 dohalt = 1; 122 break; 123 case 'k': 124 killflg = 1; 125 break; 126 case 'n': 127 nosync = "-n"; 128 break; 129 case 'r': 130 doreboot = 1; 131 break; 132 case '?': 133 default: 134 usage(); 135 } 136 argc -= optind; 137 argv += optind; 138 139 if (argc < 1) 140 usage(); 141 142 if (doreboot && dohalt) { 143 warnx("incompatible switches -h and -r."); 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 err(1, "fork"); 196 if (forkpid) 197 errx(0, "[pid %d]", forkpid); 198 } 199 #endif 200 openlog("shutdown", LOG_CONS, LOG_AUTH); 201 loop(); 202 /* NOTREACHED */ 203 } 204 205 void 206 loop() 207 { 208 struct interval *tp; 209 u_int sltime; 210 int logged; 211 212 if (offset <= NOLOG_TIME) { 213 logged = 1; 214 nolog(); 215 } 216 else 217 logged = 0; 218 tp = tlist; 219 if (tp->timeleft < offset) 220 (void)sleep((u_int)(offset - tp->timeleft)); 221 else { 222 while (offset < tp->timeleft) 223 ++tp; 224 /* 225 * Warn now, if going to sleep more than a fifth of 226 * the next wait time. 227 */ 228 if (sltime = offset - tp->timeleft) { 229 if (sltime > tp->timetowait / 5) 230 timewarn(offset); 231 (void)sleep(sltime); 232 } 233 } 234 for (;; ++tp) { 235 timewarn(tp->timeleft); 236 if (!logged && tp->timeleft <= NOLOG_TIME) { 237 logged = 1; 238 nolog(); 239 } 240 (void)sleep((u_int)tp->timetowait); 241 if (!tp->timeleft) 242 break; 243 } 244 die_you_gravy_sucking_pig_dog(); 245 } 246 247 static jmp_buf alarmbuf; 248 249 void 250 timewarn(timeleft) 251 int timeleft; 252 { 253 static int first; 254 static char hostname[MAXHOSTNAMELEN + 1]; 255 FILE *pf; 256 char wcmd[MAXPATHLEN + 4]; 257 258 if (!first++) 259 (void)gethostname(hostname, sizeof(hostname)); 260 261 /* undoc -n option to wall suppresses normal wall banner */ 262 (void)snprintf(wcmd, sizeof(wcmd), "%s -n", _PATH_WALL); 263 if (!(pf = popen(wcmd, "w"))) { 264 syslog(LOG_ERR, "shutdown: can't find %s: %m", _PATH_WALL); 265 return; 266 } 267 268 (void)fprintf(pf, 269 "\007*** %sSystem shutdown message from %s@%s ***\007\n", 270 timeleft ? "": "FINAL ", whom, hostname); 271 272 if (timeleft > 10*60) 273 (void)fprintf(pf, "System going down at %5.5s\n\n", 274 ctime(&shuttime) + 11); 275 else if (timeleft > 59) 276 (void)fprintf(pf, "System going down in %d minute%s\n\n", 277 timeleft / 60, (timeleft > 60) ? "s" : ""); 278 else if (timeleft) 279 (void)fprintf(pf, "System going down in 30 seconds\n\n"); 280 else 281 (void)fprintf(pf, "System going down IMMEDIATELY\n\n"); 282 283 if (mbuflen) 284 (void)fwrite(mbuf, sizeof(*mbuf), mbuflen, pf); 285 286 /* 287 * play some games, just in case wall doesn't come back 288 * probably unecessary, given that wall is careful. 289 */ 290 if (!setjmp(alarmbuf)) { 291 (void)signal(SIGALRM, timeout); 292 (void)alarm((u_int)30); 293 (void)pclose(pf); 294 (void)alarm((u_int)0); 295 (void)signal(SIGALRM, SIG_DFL); 296 } 297 } 298 299 void 300 timeout(signo) 301 int signo; 302 { 303 longjmp(alarmbuf, 1); 304 } 305 306 void 307 die_you_gravy_sucking_pig_dog() 308 { 309 310 syslog(LOG_NOTICE, "%s by %s: %s", 311 doreboot ? "reboot" : dohalt ? "halt" : "shutdown", whom, mbuf); 312 (void)sleep(2); 313 314 (void)printf("\r\nSystem shutdown time has arrived\007\007\r\n"); 315 if (killflg) { 316 (void)printf("\rbut you'll have to do it yourself\r\n"); 317 exit(0); 318 } 319 #ifdef DEBUG 320 if (doreboot) 321 (void)printf("reboot"); 322 else if (dohalt) 323 (void)printf("halt"); 324 if (nosync) 325 (void)printf(" no sync"); 326 (void)printf("\nkill -HUP 1\n"); 327 #else 328 if (doreboot) { 329 execle(_PATH_REBOOT, "reboot", "-l", nosync, 0); 330 syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_REBOOT); 331 perror("shutdown"); 332 } 333 else if (dohalt) { 334 execle(_PATH_HALT, "halt", "-l", nosync, 0); 335 syslog(LOG_ERR, "shutdown: can't exec %s: %m.", _PATH_HALT); 336 perror("shutdown"); 337 } 338 (void)kill(1, SIGTERM); /* to single user */ 339 #endif 340 finish(0); 341 } 342 343 #define ATOI2(p) (p[0] - '0') * 10 + (p[1] - '0'); p += 2; 344 345 void 346 getoffset(timearg) 347 register char *timearg; 348 { 349 register struct tm *lt; 350 register char *p; 351 time_t now; 352 353 if (!strcasecmp(timearg, "now")) { /* now */ 354 offset = 0; 355 return; 356 } 357 358 (void)time(&now); 359 if (*timearg == '+') { /* +minutes */ 360 if (!isdigit(*++timearg)) 361 badtime(); 362 offset = atoi(timearg) * 60; 363 shuttime = now + offset; 364 return; 365 } 366 367 /* handle hh:mm by getting rid of the colon */ 368 for (p = timearg; *p; ++p) 369 if (!isascii(*p) || !isdigit(*p)) 370 if (*p == ':' && strlen(p) == 3) { 371 p[0] = p[1]; 372 p[1] = p[2]; 373 p[2] = '\0'; 374 } 375 else 376 badtime(); 377 378 unsetenv("TZ"); /* OUR timezone */ 379 lt = localtime(&now); /* current time val */ 380 381 switch(strlen(timearg)) { 382 case 10: 383 lt->tm_year = ATOI2(timearg); 384 /* FALLTHROUGH */ 385 case 8: 386 lt->tm_mon = ATOI2(timearg); 387 if (--lt->tm_mon < 0 || lt->tm_mon > 11) 388 badtime(); 389 /* FALLTHROUGH */ 390 case 6: 391 lt->tm_mday = ATOI2(timearg); 392 if (lt->tm_mday < 1 || lt->tm_mday > 31) 393 badtime(); 394 /* FALLTHROUGH */ 395 case 4: 396 lt->tm_hour = ATOI2(timearg); 397 if (lt->tm_hour < 0 || lt->tm_hour > 23) 398 badtime(); 399 lt->tm_min = ATOI2(timearg); 400 if (lt->tm_min < 0 || lt->tm_min > 59) 401 badtime(); 402 lt->tm_sec = 0; 403 if ((shuttime = mktime(lt)) == -1) 404 badtime(); 405 if ((offset = shuttime - now) < 0) 406 errx(1, "that time is already past."); 407 break; 408 default: 409 badtime(); 410 } 411 } 412 413 #define NOMSG "\n\nNO LOGINS: System going down at " 414 void 415 nolog() 416 { 417 int logfd; 418 char *ct; 419 420 (void)unlink(_PATH_NOLOGIN); /* in case linked to another file */ 421 (void)signal(SIGINT, finish); 422 (void)signal(SIGHUP, finish); 423 (void)signal(SIGQUIT, finish); 424 (void)signal(SIGTERM, finish); 425 if ((logfd = open(_PATH_NOLOGIN, O_WRONLY|O_CREAT|O_TRUNC, 426 0664)) >= 0) { 427 (void)write(logfd, NOMSG, sizeof(NOMSG) - 1); 428 ct = ctime(&shuttime); 429 (void)write(logfd, ct + 11, 5); 430 (void)write(logfd, "\n\n", 2); 431 (void)write(logfd, mbuf, strlen(mbuf)); 432 (void)close(logfd); 433 } 434 } 435 436 void 437 finish(signo) 438 int signo; 439 { 440 (void)unlink(_PATH_NOLOGIN); 441 exit(0); 442 } 443 444 void 445 badtime() 446 { 447 errx(1, "bad time format."); 448 } 449 450 void 451 usage() 452 { 453 fprintf(stderr, "usage: shutdown [-hknr] shutdowntime [ message ]\n"); 454 exit(1); 455 } 456