1 /*- 2 * Copyright (c) 1991, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Donn Seeley at Berkeley Software Design, Inc. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#) Copyright (c) 1991, 1993 The Regents of the University of California. All rights reserved. 37 * @(#)init.c 8.1 (Berkeley) 7/15/93 38 * $FreeBSD: src/sbin/init/init.c,v 1.38.2.8 2001/10/22 11:27:32 des Exp $ 39 */ 40 41 #include <sys/param.h> 42 #include <sys/ioctl.h> 43 #include <sys/mount.h> 44 #include <sys/sysctl.h> 45 #include <sys/wait.h> 46 #include <sys/stat.h> 47 48 #include <db.h> 49 #include <errno.h> 50 #include <fcntl.h> 51 #include <libutil.h> 52 #include <utmpx.h> 53 #include <paths.h> 54 #include <signal.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <syslog.h> 59 #include <time.h> 60 #include <ttyent.h> 61 #include <unistd.h> 62 #include <sys/reboot.h> 63 #include <err.h> 64 65 #include <stdarg.h> 66 67 #ifdef SECURE 68 #include <pwd.h> 69 #endif 70 71 #ifdef LOGIN_CAP 72 #include <login_cap.h> 73 #endif 74 75 #include "pathnames.h" 76 77 /* 78 * Sleep times; used to prevent thrashing. 79 */ 80 #define GETTY_SPACING 5 /* N secs minimum getty spacing */ 81 #define GETTY_SLEEP 30 /* sleep N secs after spacing problem */ 82 #define GETTY_NSPACE 3 /* max. spacing count to bring reaction */ 83 #define WINDOW_WAIT 3 /* wait N secs after starting window */ 84 #define STALL_TIMEOUT 30 /* wait N secs after warning */ 85 #define DEATH_WATCH 10 /* wait N secs for procs to die */ 86 #define DEATH_SCRIPT 120 /* wait for 2min for /etc/rc.shutdown */ 87 #define RESOURCE_RC "daemon" 88 #define RESOURCE_WINDOW "default" 89 #define RESOURCE_GETTY "default" 90 91 /* 92 * We really need a recursive typedef... 93 * The following at least guarantees that the return type of (*state_t)() 94 * is sufficiently wide to hold a function pointer. 95 */ 96 typedef long (*state_func_t)(void); 97 typedef state_func_t (*state_t)(void); 98 99 enum { AUTOBOOT, FASTBOOT } runcom_mode = AUTOBOOT; 100 #define FALSE 0 101 #define TRUE 1 102 103 static void setctty(const char *); 104 105 typedef struct init_session { 106 int se_index; /* index of entry in ttys file */ 107 pid_t se_process; /* controlling process */ 108 struct timeval se_started; /* used to avoid thrashing */ 109 int se_flags; /* status of session */ 110 #define SE_SHUTDOWN 0x1 /* session won't be restarted */ 111 #define SE_PRESENT 0x2 /* session is in /etc/ttys */ 112 int se_nspace; /* spacing count */ 113 char *se_device; /* filename of port */ 114 char *se_getty; /* what to run on that port */ 115 char *se_getty_argv_space; /* pre-parsed argument array space */ 116 char **se_getty_argv; /* pre-parsed argument array */ 117 char *se_window; /* window system (started only once) */ 118 char *se_window_argv_space; /* pre-parsed argument array space */ 119 char **se_window_argv; /* pre-parsed argument array */ 120 char *se_type; /* default terminal type */ 121 struct init_session *se_prev; 122 struct init_session *se_next; 123 } session_t; 124 125 static void handle(sig_t, ...); 126 static void delset(sigset_t *, ...); 127 128 static void stall(const char *, ...) __printflike(1, 2); 129 static void warning(const char *, ...) __printflike(1, 2); 130 static void emergency(const char *, ...) __printflike(1, 2); 131 static void disaster(int); 132 static void badsys(int); 133 static int runshutdown(void); 134 static char *strk(char *); 135 136 #define DEATH 'd' 137 #define SINGLE_USER 's' 138 #define RUNCOM 'r' 139 #define READ_TTYS 't' 140 #define MULTI_USER 'm' 141 #define CLEAN_TTYS 'T' 142 #define CATATONIA 'c' 143 144 static state_func_t single_user(void); 145 static state_func_t runcom(void); 146 static state_func_t read_ttys(void); 147 static state_func_t multi_user(void); 148 static state_func_t clean_ttys(void); 149 static state_func_t catatonia(void); 150 static state_func_t death(void); 151 152 static void transition(state_t); 153 154 static void free_session(session_t *); 155 static session_t *new_session(session_t *, int, struct ttyent *); 156 157 static char **construct_argv(char *); 158 static void start_window_system(session_t *); 159 static void collect_child(pid_t); 160 static pid_t start_getty(session_t *); 161 static void transition_handler(int); 162 static void alrm_handler(int); 163 static void setsecuritylevel(int); 164 static int getsecuritylevel(void); 165 static char *get_chroot(void); 166 static int setupargv(session_t *, struct ttyent *); 167 #ifdef LOGIN_CAP 168 static void setprocresources(const char *); 169 #endif 170 171 static void clear_session_logs(session_t *); 172 173 static int start_session_db(void); 174 static void add_session(session_t *); 175 static void del_session(session_t *); 176 static session_t *find_session(pid_t); 177 178 #ifdef SUPPORT_UTMPX 179 static struct timeval boot_time; 180 state_t current_state = death; 181 static void session_utmpx(const session_t *, int); 182 static void make_utmpx(const char *, const char *, int, pid_t, 183 const struct timeval *, int); 184 static char get_runlevel(const state_t); 185 static void utmpx_set_runlevel(char, char); 186 #endif 187 188 static int Reboot = FALSE; 189 static int howto = RB_AUTOBOOT; 190 191 static DB *session_db; 192 static volatile sig_atomic_t clang; 193 static session_t *sessions; 194 state_t requested_transition = runcom; 195 196 197 /* 198 * The mother of all processes. 199 */ 200 int 201 main(int argc, char **argv) 202 { 203 char *init_chroot; 204 int c; 205 struct sigaction sa; 206 sigset_t mask; 207 struct stat sts; 208 209 #ifdef SUPPORT_UTMPX 210 (void)gettimeofday(&boot_time, NULL); 211 #endif /* SUPPORT_UTMPX */ 212 213 /* Dispose of random users. */ 214 if (getuid() != 0) 215 errx(1, "%s", strerror(EPERM)); 216 217 /* System V users like to reexec init. */ 218 if (getpid() != 1) { 219 #ifdef COMPAT_SYSV_INIT 220 /* So give them what they want */ 221 if (argc > 1) { 222 if (strlen(argv[1]) == 1) { 223 char runlevel = *argv[1]; 224 int sig; 225 226 switch (runlevel) { 227 case '0': /* halt + poweroff */ 228 sig = SIGUSR2; 229 break; 230 case '1': /* single-user */ 231 sig = SIGTERM; 232 break; 233 case '6': /* reboot */ 234 sig = SIGINT; 235 break; 236 case 'c': /* block further logins */ 237 sig = SIGTSTP; 238 break; 239 case 'q': /* rescan /etc/ttys */ 240 sig = SIGHUP; 241 break; 242 default: 243 goto invalid; 244 } 245 kill(1, sig); 246 _exit(0); 247 } else 248 invalid: 249 errx(1, "invalid run-level ``%s''", argv[1]); 250 } else 251 #endif 252 errx(1, "already running"); 253 } 254 /* 255 * Note that this does NOT open a file... 256 * Does 'init' deserve its own facility number? 257 */ 258 openlog("init", LOG_CONS|LOG_ODELAY, LOG_AUTH); 259 260 /* 261 * If chroot has been requested by the boot loader, 262 * do it now. Try to be robust: If the directory 263 * doesn't exist, continue anyway. 264 */ 265 init_chroot = get_chroot(); 266 if (init_chroot != NULL) { 267 if (chdir(init_chroot) == -1 || chroot(".") == -1) 268 warning("can't chroot to %s: %m", init_chroot); 269 free(init_chroot); 270 } 271 272 /* 273 * Create an initial session. 274 */ 275 if (setsid() < 0) 276 warning("initial setsid() failed: %m"); 277 278 /* 279 * Establish an initial user so that programs running 280 * single user do not freak out and die (like passwd). 281 */ 282 if (setlogin("root") < 0) 283 warning("setlogin() failed: %m"); 284 285 if (stat("/dev/null", &sts) < 0) { 286 warning("/dev MAY BE CORRUPT! /dev/null is missing!\n"); 287 sleep(5); 288 } 289 290 /* 291 * This code assumes that we always get arguments through flags, 292 * never through bits set in some random machine register. 293 */ 294 while ((c = getopt(argc, argv, "dsf")) != -1) 295 switch (c) { 296 case 'd': 297 /* We don't support DEVFS. */ 298 break; 299 case 's': 300 requested_transition = single_user; 301 break; 302 case 'f': 303 runcom_mode = FASTBOOT; 304 break; 305 default: 306 warning("unrecognized flag '-%c'", c); 307 break; 308 } 309 310 if (optind != argc) 311 warning("ignoring excess arguments"); 312 313 /* 314 * We catch or block signals rather than ignore them, 315 * so that they get reset on exec. 316 */ 317 handle(badsys, SIGSYS, 0); 318 handle(disaster, SIGABRT, SIGFPE, SIGILL, SIGSEGV, 319 SIGBUS, SIGXCPU, SIGXFSZ, 0); 320 handle(transition_handler, SIGHUP, SIGINT, SIGTERM, SIGTSTP, 321 SIGUSR1, SIGUSR2, 0); 322 handle(alrm_handler, SIGALRM, 0); 323 sigfillset(&mask); 324 delset(&mask, SIGABRT, SIGFPE, SIGILL, SIGSEGV, SIGBUS, SIGSYS, 325 SIGXCPU, SIGXFSZ, SIGHUP, SIGINT, SIGTERM, SIGTSTP, SIGALRM, 326 SIGUSR1, SIGUSR2, 0); 327 sigprocmask(SIG_SETMASK, &mask, NULL); 328 sigemptyset(&sa.sa_mask); 329 sa.sa_flags = 0; 330 sa.sa_handler = SIG_IGN; 331 sigaction(SIGTTIN, &sa, NULL); 332 sigaction(SIGTTOU, &sa, NULL); 333 334 /* 335 * Paranoia. 336 */ 337 close(0); 338 close(1); 339 close(2); 340 341 /* 342 * Start the state machine. 343 */ 344 transition(requested_transition); 345 346 /* 347 * Should never reach here. 348 */ 349 return 1; 350 } 351 352 /* 353 * Associate a function with a signal handler. 354 */ 355 static void 356 handle(sig_t handler, ...) 357 { 358 int sig; 359 struct sigaction sa; 360 sigset_t mask_everything; 361 va_list ap; 362 363 va_start(ap, handler); 364 365 sa.sa_handler = handler; 366 sigfillset(&mask_everything); 367 368 while ((sig = va_arg(ap, int)) != 0) { 369 sa.sa_mask = mask_everything; 370 /* XXX SA_RESTART? */ 371 sa.sa_flags = sig == SIGCHLD ? SA_NOCLDSTOP : 0; 372 sigaction(sig, &sa, NULL); 373 } 374 va_end(ap); 375 } 376 377 /* 378 * Delete a set of signals from a mask. 379 */ 380 static void 381 delset(sigset_t *maskp, ...) 382 { 383 int sig; 384 va_list ap; 385 386 va_start(ap, maskp); 387 388 while ((sig = va_arg(ap, int)) != 0) 389 sigdelset(maskp, sig); 390 va_end(ap); 391 } 392 393 /* 394 * Log a message and sleep for a while (to give someone an opportunity 395 * to read it and to save log or hardcopy output if the problem is chronic). 396 * NB: should send a message to the session logger to avoid blocking. 397 */ 398 static void 399 stall(const char *message, ...) 400 { 401 va_list ap; 402 403 va_start(ap, message); 404 405 vsyslog(LOG_ALERT, message, ap); 406 va_end(ap); 407 sleep(STALL_TIMEOUT); 408 } 409 410 /* 411 * Like stall(), but doesn't sleep. 412 * If cpp had variadic macros, the two functions could be #defines for another. 413 * NB: should send a message to the session logger to avoid blocking. 414 */ 415 static void 416 warning(const char *message, ...) 417 { 418 va_list ap; 419 420 va_start(ap, message); 421 422 vsyslog(LOG_ALERT, message, ap); 423 va_end(ap); 424 } 425 426 /* 427 * Log an emergency message. 428 * NB: should send a message to the session logger to avoid blocking. 429 */ 430 static void 431 emergency(const char *message, ...) 432 { 433 va_list ap; 434 435 va_start(ap, message); 436 437 vsyslog(LOG_EMERG, message, ap); 438 va_end(ap); 439 } 440 441 /* 442 * Catch a SIGSYS signal. 443 * 444 * These may arise if a system does not support sysctl. 445 * We tolerate up to 25 of these, then throw in the towel. 446 */ 447 static void 448 badsys(int sig) 449 { 450 static int badcount = 0; 451 452 if (badcount++ < 25) 453 return; 454 disaster(sig); 455 } 456 457 /* 458 * Catch an unexpected signal. 459 */ 460 static void 461 disaster(int sig) 462 { 463 emergency("fatal signal: %s", 464 (unsigned)sig < NSIG ? sys_siglist[sig] : "unknown signal"); 465 466 sleep(STALL_TIMEOUT); 467 _exit(sig); /* reboot */ 468 } 469 470 /* 471 * Get the security level of the kernel. 472 */ 473 static int 474 getsecuritylevel(void) 475 { 476 #ifdef KERN_SECURELVL 477 int name[2], curlevel; 478 size_t len; 479 480 name[0] = CTL_KERN; 481 name[1] = KERN_SECURELVL; 482 len = sizeof curlevel; 483 if (sysctl(name, 2, &curlevel, &len, NULL, 0) == -1) { 484 emergency("cannot get kernel security level: %s", 485 strerror(errno)); 486 return (-1); 487 } 488 return (curlevel); 489 #else 490 return (-1); 491 #endif 492 } 493 494 /* 495 * Get the value of the "init_chroot" variable from the 496 * kernel environment (or NULL if not set). 497 */ 498 499 static char * 500 get_chroot(void) 501 { 502 static const char ichname[] = "init_chroot="; /* includes '=' */ 503 const int ichlen = strlen(ichname); 504 int real_oid[CTL_MAXNAME]; 505 char sbuf[1024]; 506 size_t oidlen, slen; 507 char *res; 508 int i; 509 510 oidlen = __arysize(real_oid); 511 if (sysctlnametomib("kern.environment", real_oid, &oidlen)) { 512 warning("cannot find kern.environment base sysctl OID"); 513 return NULL; 514 } 515 if (oidlen + 1 >= __arysize(real_oid)) { 516 warning("kern.environment OID is too large!"); 517 return NULL; 518 } 519 res = NULL; 520 real_oid[oidlen] = 0; 521 522 for (i = 0; ; i++) { 523 real_oid[oidlen + 1] = i; 524 slen = sizeof(sbuf); 525 if (sysctl(real_oid, oidlen + 2, sbuf, &slen, NULL, 0) < 0) { 526 if (errno != ENOENT) 527 warning("sysctl kern.environment.%d: %m", i); 528 break; 529 } 530 531 /* 532 * slen includes the terminating \0, but do a few sanity 533 * checks anyway. 534 */ 535 if (slen == 0) 536 continue; 537 sbuf[slen - 1] = 0; 538 if (strncmp(sbuf, ichname, ichlen) != 0) 539 continue; 540 if (sbuf[ichlen]) 541 res = strdup(sbuf + ichlen); 542 break; 543 } 544 return (res); 545 } 546 547 /* 548 * Set the security level of the kernel. 549 */ 550 static void 551 setsecuritylevel(int newlevel) 552 { 553 #ifdef KERN_SECURELVL 554 int name[2], curlevel; 555 556 curlevel = getsecuritylevel(); 557 if (newlevel == curlevel) 558 return; 559 name[0] = CTL_KERN; 560 name[1] = KERN_SECURELVL; 561 if (sysctl(name, 2, NULL, NULL, &newlevel, sizeof newlevel) == -1) { 562 emergency( 563 "cannot change kernel security level from %d to %d: %s", 564 curlevel, newlevel, strerror(errno)); 565 return; 566 } 567 #ifdef SECURE 568 warning("kernel security level changed from %d to %d", 569 curlevel, newlevel); 570 #endif 571 #endif 572 } 573 574 /* 575 * Change states in the finite state machine. 576 * The initial state is passed as an argument. 577 */ 578 static void 579 transition(state_t s) 580 { 581 for (;;) { 582 #ifdef SUPPORT_UTMPX 583 utmpx_set_runlevel(get_runlevel(current_state), 584 get_runlevel(s)); 585 current_state = s; 586 #endif 587 s = (state_t) (*s)(); 588 } 589 } 590 591 /* 592 * Close out the accounting files for a login session. 593 * NB: should send a message to the session logger to avoid blocking. 594 */ 595 static void 596 clear_session_logs(session_t *sp) 597 { 598 char *line = sp->se_device + sizeof(_PATH_DEV) - 1; 599 600 #ifdef SUPPORT_UTMPX 601 if (logoutx(line, 0, DEAD_PROCESS)) 602 logwtmpx(line, "", "", 0, DEAD_PROCESS); 603 #endif 604 if (logout(line)) 605 logwtmp(line, "", ""); 606 } 607 608 /* 609 * Start a session and allocate a controlling terminal. 610 * Only called by children of init after forking. 611 */ 612 static void 613 setctty(const char *name) 614 { 615 int fd; 616 617 revoke(name); 618 if ((fd = open(name, O_RDWR)) == -1) { 619 stall("can't open %s: %m", name); 620 _exit(1); 621 } 622 if (login_tty(fd) == -1) { 623 stall("can't get %s for controlling terminal: %m", name); 624 _exit(1); 625 } 626 } 627 628 /* 629 * Bring the system up single user. 630 */ 631 static state_func_t 632 single_user(void) 633 { 634 pid_t pid, wpid; 635 int status; 636 sigset_t mask; 637 const char *shell = _PATH_BSHELL; 638 const char *argv[2]; 639 #ifdef SECURE 640 struct ttyent *typ; 641 struct passwd *pp; 642 static const char banner[] = 643 "Enter root password, or ^D to go multi-user\n"; 644 char *clear, *password; 645 #endif 646 #ifdef DEBUGSHELL 647 char altshell[128]; 648 #endif 649 650 if (Reboot) { 651 /* Instead of going single user, let's reboot the machine */ 652 sync(); 653 alarm(2); 654 pause(); 655 reboot(howto); 656 _exit(0); 657 } 658 659 if ((pid = fork()) == 0) { 660 /* 661 * Start the single user session. 662 */ 663 setctty(_PATH_CONSOLE); 664 665 #ifdef SECURE 666 /* 667 * Check the root password. 668 * We don't care if the console is 'on' by default; 669 * it's the only tty that can be 'off' and 'secure'. 670 */ 671 typ = getttynam("console"); 672 pp = getpwnam("root"); 673 if (typ && (typ->ty_status & TTY_SECURE) == 0 && 674 pp && *pp->pw_passwd) { 675 write(2, banner, sizeof banner - 1); 676 for (;;) { 677 clear = getpass("Password:"); 678 if (clear == 0 || *clear == '\0') 679 _exit(0); 680 password = crypt(clear, pp->pw_passwd); 681 bzero(clear, _PASSWORD_LEN); 682 if (strcmp(password, pp->pw_passwd) == 0) 683 break; 684 warning("single-user login failed\n"); 685 } 686 } 687 endttyent(); 688 endpwent(); 689 #endif /* SECURE */ 690 691 #ifdef DEBUGSHELL 692 { 693 char *cp = altshell; 694 int num; 695 696 #define SHREQUEST \ 697 "Enter full pathname of shell or RETURN for " _PATH_BSHELL ": " 698 write(STDERR_FILENO, SHREQUEST, sizeof(SHREQUEST) - 1); 699 while ((num = read(STDIN_FILENO, cp, 1)) != -1 && 700 num != 0 && *cp != '\n' && cp < &altshell[127]) 701 cp++; 702 *cp = '\0'; 703 if (altshell[0] != '\0') 704 shell = altshell; 705 } 706 #endif /* DEBUGSHELL */ 707 708 /* 709 * Unblock signals. 710 * We catch all the interesting ones, 711 * and those are reset to SIG_DFL on exec. 712 */ 713 sigemptyset(&mask); 714 sigprocmask(SIG_SETMASK, &mask, NULL); 715 716 /* 717 * Fire off a shell. 718 * If the default one doesn't work, try the Bourne shell. 719 */ 720 argv[0] = "-sh"; 721 argv[1] = 0; 722 execv(shell, __DECONST(char **, argv)); 723 emergency("can't exec %s for single user: %m", shell); 724 execv(_PATH_BSHELL, __DECONST(char **, argv)); 725 emergency("can't exec %s for single user: %m", _PATH_BSHELL); 726 sleep(STALL_TIMEOUT); 727 _exit(1); 728 } 729 730 if (pid == -1) { 731 /* 732 * We are seriously hosed. Do our best. 733 */ 734 emergency("can't fork single-user shell, trying again"); 735 while (waitpid(-1, NULL, WNOHANG) > 0) 736 continue; 737 return (state_func_t) single_user; 738 } 739 740 requested_transition = 0; 741 do { 742 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 743 collect_child(wpid); 744 if (wpid == -1) { 745 if (errno == EINTR) 746 continue; 747 warning("wait for single-user shell failed: %m; restarting"); 748 return (state_func_t) single_user; 749 } 750 if (wpid == pid && WIFSTOPPED(status)) { 751 warning("init: shell stopped, restarting\n"); 752 kill(pid, SIGCONT); 753 wpid = -1; 754 } 755 } while (wpid != pid && !requested_transition); 756 757 if (requested_transition) 758 return (state_func_t) requested_transition; 759 760 if (!WIFEXITED(status)) { 761 if (WTERMSIG(status) == SIGKILL) { 762 /* 763 * reboot(8) killed shell? 764 */ 765 warning("single user shell terminated."); 766 sleep(STALL_TIMEOUT); 767 _exit(0); 768 } else { 769 warning("single user shell terminated, restarting"); 770 return (state_func_t) single_user; 771 } 772 } 773 774 runcom_mode = FASTBOOT; 775 return (state_func_t) runcom; 776 } 777 778 /* 779 * Run the system startup script. 780 */ 781 static state_func_t 782 runcom(void) 783 { 784 pid_t pid, wpid; 785 int status; 786 const char *argv[4]; 787 struct sigaction sa; 788 789 if ((pid = fork()) == 0) { 790 sigemptyset(&sa.sa_mask); 791 sa.sa_flags = 0; 792 sa.sa_handler = SIG_IGN; 793 sigaction(SIGTSTP, &sa, NULL); 794 sigaction(SIGHUP, &sa, NULL); 795 796 setctty(_PATH_CONSOLE); 797 798 argv[0] = "sh"; 799 argv[1] = _PATH_RUNCOM; 800 argv[2] = runcom_mode == AUTOBOOT ? "autoboot" : 0; 801 argv[3] = 0; 802 803 sigprocmask(SIG_SETMASK, &sa.sa_mask, NULL); 804 805 #ifdef LOGIN_CAP 806 setprocresources(RESOURCE_RC); 807 #endif 808 execv(_PATH_BSHELL, __DECONST(char **, argv)); 809 stall("can't exec %s for %s: %m", _PATH_BSHELL, _PATH_RUNCOM); 810 _exit(1); /* force single user mode */ 811 } 812 813 if (pid == -1) { 814 emergency("can't fork for %s on %s: %m", 815 _PATH_BSHELL, _PATH_RUNCOM); 816 while (waitpid(-1, NULL, WNOHANG) > 0) 817 continue; 818 sleep(STALL_TIMEOUT); 819 return (state_func_t) single_user; 820 } 821 822 /* 823 * Copied from single_user(). This is a bit paranoid. 824 */ 825 requested_transition = 0; 826 do { 827 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 828 collect_child(wpid); 829 if (wpid == -1) { 830 if (requested_transition == death) 831 return (state_func_t) death; 832 if (errno == EINTR) 833 continue; 834 warning("wait for %s on %s failed: %m; going to single user mode", 835 _PATH_BSHELL, _PATH_RUNCOM); 836 return (state_func_t) single_user; 837 } 838 if (wpid == pid && WIFSTOPPED(status)) { 839 warning("init: %s on %s stopped, restarting\n", 840 _PATH_BSHELL, _PATH_RUNCOM); 841 kill(pid, SIGCONT); 842 wpid = -1; 843 } 844 } while (wpid != pid); 845 846 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGTERM && 847 requested_transition == catatonia) { 848 /* /etc/rc executed /sbin/reboot; wait for the end quietly */ 849 sigset_t s; 850 851 sigfillset(&s); 852 for (;;) 853 sigsuspend(&s); 854 } 855 856 if (!WIFEXITED(status)) { 857 warning("%s on %s terminated abnormally, going to single user mode", 858 _PATH_BSHELL, _PATH_RUNCOM); 859 return (state_func_t) single_user; 860 } 861 862 if (WEXITSTATUS(status)) 863 return (state_func_t) single_user; 864 865 runcom_mode = AUTOBOOT; /* the default */ 866 /* NB: should send a message to the session logger to avoid blocking. */ 867 #ifdef SUPPORT_UTMPX 868 logwtmpx("~", "reboot", "", 0, INIT_PROCESS); 869 #endif 870 logwtmp("~", "reboot", ""); 871 return (state_func_t) read_ttys; 872 } 873 874 /* 875 * Open the session database. 876 * 877 * NB: We could pass in the size here; is it necessary? 878 */ 879 static int 880 start_session_db(void) 881 { 882 if (session_db && (*session_db->close)(session_db)) 883 emergency("session database close: %s", strerror(errno)); 884 if ((session_db = dbopen(NULL, O_RDWR, 0, DB_HASH, NULL)) == 0) { 885 emergency("session database open: %s", strerror(errno)); 886 return (1); 887 } 888 return (0); 889 890 } 891 892 /* 893 * Add a new login session. 894 */ 895 static void 896 add_session(session_t *sp) 897 { 898 DBT key; 899 DBT data; 900 901 key.data = &sp->se_process; 902 key.size = sizeof sp->se_process; 903 data.data = &sp; 904 data.size = sizeof sp; 905 906 if ((*session_db->put)(session_db, &key, &data, 0)) 907 emergency("insert %d: %s", sp->se_process, strerror(errno)); 908 #ifdef SUPPORT_UTMPX 909 session_utmpx(sp, 1); 910 #endif 911 } 912 913 /* 914 * Delete an old login session. 915 */ 916 static void 917 del_session(session_t *sp) 918 { 919 DBT key; 920 921 key.data = &sp->se_process; 922 key.size = sizeof sp->se_process; 923 924 if ((*session_db->del)(session_db, &key, 0)) 925 emergency("delete %d: %s", sp->se_process, strerror(errno)); 926 #ifdef SUPPORT_UTMPX 927 session_utmpx(sp, 0); 928 #endif 929 } 930 931 /* 932 * Look up a login session by pid. 933 */ 934 static session_t * 935 find_session(pid_t pid) 936 { 937 DBT key; 938 DBT data; 939 session_t *ret; 940 941 key.data = &pid; 942 key.size = sizeof pid; 943 if ((*session_db->get)(session_db, &key, &data, 0) != 0) 944 return 0; 945 bcopy(data.data, (char *)&ret, sizeof(ret)); 946 return ret; 947 } 948 949 /* 950 * Construct an argument vector from a command line. 951 */ 952 static char ** 953 construct_argv(char *command) 954 { 955 int argc = 0; 956 char **argv = malloc(((strlen(command) + 1) / 2 + 1) 957 * sizeof (char *)); 958 959 if ((argv[argc++] = strk(command)) == 0) { 960 free(argv); 961 return (NULL); 962 } 963 while ((argv[argc++] = strk(NULL)) != NULL) 964 continue; 965 return argv; 966 } 967 968 /* 969 * Deallocate a session descriptor. 970 */ 971 static void 972 free_session(session_t *sp) 973 { 974 free(sp->se_device); 975 if (sp->se_getty) { 976 free(sp->se_getty); 977 free(sp->se_getty_argv_space); 978 free(sp->se_getty_argv); 979 } 980 if (sp->se_window) { 981 free(sp->se_window); 982 free(sp->se_window_argv_space); 983 free(sp->se_window_argv); 984 } 985 if (sp->se_type) 986 free(sp->se_type); 987 free(sp); 988 } 989 990 /* 991 * Allocate a new session descriptor. 992 * Mark it SE_PRESENT. 993 */ 994 static session_t * 995 new_session(session_t *sprev, int session_index, struct ttyent *typ) 996 { 997 session_t *sp; 998 int fd; 999 1000 if ((typ->ty_status & TTY_ON) == 0 || 1001 typ->ty_name == 0 || 1002 typ->ty_getty == 0) 1003 return 0; 1004 1005 sp = (session_t *) calloc(1, sizeof (session_t)); 1006 1007 sp->se_index = session_index; 1008 sp->se_flags |= SE_PRESENT; 1009 1010 sp->se_device = malloc(sizeof(_PATH_DEV) + strlen(typ->ty_name)); 1011 sprintf(sp->se_device, "%s%s", _PATH_DEV, typ->ty_name); 1012 1013 /* 1014 * Attempt to open the device, if we get "device not configured" 1015 * then don't add the device to the session list. 1016 */ 1017 if ((fd = open(sp->se_device, O_RDONLY | O_NONBLOCK, 0)) < 0) { 1018 if (errno == ENXIO) { 1019 free_session(sp); 1020 return (0); 1021 } 1022 } else 1023 close(fd); 1024 1025 if (setupargv(sp, typ) == 0) { 1026 free_session(sp); 1027 return (0); 1028 } 1029 1030 sp->se_next = 0; 1031 if (sprev == 0) { 1032 sessions = sp; 1033 sp->se_prev = 0; 1034 } else { 1035 sprev->se_next = sp; 1036 sp->se_prev = sprev; 1037 } 1038 1039 return sp; 1040 } 1041 1042 /* 1043 * Calculate getty and if useful window argv vectors. 1044 */ 1045 static int 1046 setupargv(session_t *sp, struct ttyent *typ) 1047 { 1048 1049 if (sp->se_getty) { 1050 free(sp->se_getty); 1051 free(sp->se_getty_argv_space); 1052 free(sp->se_getty_argv); 1053 } 1054 sp->se_getty = malloc(strlen(typ->ty_getty) + strlen(typ->ty_name) + 2); 1055 sprintf(sp->se_getty, "%s %s", typ->ty_getty, typ->ty_name); 1056 sp->se_getty_argv_space = strdup(sp->se_getty); 1057 sp->se_getty_argv = construct_argv(sp->se_getty_argv_space); 1058 if (sp->se_getty_argv == 0) { 1059 warning("can't parse getty for port %s", sp->se_device); 1060 free(sp->se_getty); 1061 free(sp->se_getty_argv_space); 1062 sp->se_getty = sp->se_getty_argv_space = 0; 1063 return (0); 1064 } 1065 if (sp->se_window) { 1066 free(sp->se_window); 1067 free(sp->se_window_argv_space); 1068 free(sp->se_window_argv); 1069 } 1070 sp->se_window = sp->se_window_argv_space = 0; 1071 sp->se_window_argv = 0; 1072 if (typ->ty_window) { 1073 sp->se_window = strdup(typ->ty_window); 1074 sp->se_window_argv_space = strdup(sp->se_window); 1075 sp->se_window_argv = construct_argv(sp->se_window_argv_space); 1076 if (sp->se_window_argv == 0) { 1077 warning("can't parse window for port %s", 1078 sp->se_device); 1079 free(sp->se_window_argv_space); 1080 free(sp->se_window); 1081 sp->se_window = sp->se_window_argv_space = 0; 1082 return (0); 1083 } 1084 } 1085 if (sp->se_type) 1086 free(sp->se_type); 1087 sp->se_type = typ->ty_type ? strdup(typ->ty_type) : 0; 1088 return (1); 1089 } 1090 1091 /* 1092 * Walk the list of ttys and create sessions for each active line. 1093 */ 1094 static state_func_t 1095 read_ttys(void) 1096 { 1097 int session_index = 0; 1098 session_t *sp, *snext; 1099 struct ttyent *typ; 1100 1101 #ifdef SUPPORT_UTMPX 1102 if (sessions == NULL) { 1103 struct stat st; 1104 1105 make_utmpx("", BOOT_MSG, BOOT_TIME, 0, &boot_time, 0); 1106 1107 /* 1108 * If wtmpx is not empty, pick the down time from there 1109 */ 1110 if (stat(_PATH_WTMPX, &st) != -1 && st.st_size != 0) { 1111 struct timeval down_time; 1112 1113 TIMESPEC_TO_TIMEVAL(&down_time, 1114 st.st_atime > st.st_mtime ? 1115 &st.st_atimespec : &st.st_mtimespec); 1116 make_utmpx("", DOWN_MSG, DOWN_TIME, 0, &down_time, 0); 1117 } 1118 } 1119 #endif 1120 /* 1121 * Destroy any previous session state. 1122 * There shouldn't be any, but just in case... 1123 */ 1124 for (sp = sessions; sp; sp = snext) { 1125 if (sp->se_process) 1126 clear_session_logs(sp); 1127 snext = sp->se_next; 1128 free_session(sp); 1129 } 1130 sessions = 0; 1131 if (start_session_db()) 1132 return (state_func_t) single_user; 1133 1134 /* 1135 * Allocate a session entry for each active port. 1136 * Note that sp starts at 0. 1137 */ 1138 while ((typ = getttyent()) != NULL) 1139 if ((snext = new_session(sp, ++session_index, typ)) != NULL) 1140 sp = snext; 1141 1142 endttyent(); 1143 1144 return (state_func_t) multi_user; 1145 } 1146 1147 /* 1148 * Start a window system running. 1149 */ 1150 static void 1151 start_window_system(session_t *sp) 1152 { 1153 pid_t pid; 1154 sigset_t mask; 1155 char term[64], *env[2]; 1156 1157 if ((pid = fork()) == -1) { 1158 emergency("can't fork for window system on port %s: %m", 1159 sp->se_device); 1160 /* hope that getty fails and we can try again */ 1161 return; 1162 } 1163 1164 if (pid) 1165 return; 1166 1167 sigemptyset(&mask); 1168 sigprocmask(SIG_SETMASK, &mask, NULL); 1169 1170 if (setsid() < 0) 1171 emergency("setsid failed (window) %m"); 1172 1173 #ifdef LOGIN_CAP 1174 setprocresources(RESOURCE_WINDOW); 1175 #endif 1176 if (sp->se_type) { 1177 /* Don't use malloc after fork */ 1178 strcpy(term, "TERM="); 1179 strncat(term, sp->se_type, sizeof(term) - 6); 1180 env[0] = term; 1181 env[1] = 0; 1182 } 1183 else 1184 env[0] = 0; 1185 execve(sp->se_window_argv[0], sp->se_window_argv, env); 1186 stall("can't exec window system '%s' for port %s: %m", 1187 sp->se_window_argv[0], sp->se_device); 1188 _exit(1); 1189 } 1190 1191 /* 1192 * Start a login session running. 1193 */ 1194 static pid_t 1195 start_getty(session_t *sp) 1196 { 1197 pid_t pid; 1198 sigset_t mask; 1199 time_t current_time = time(NULL); 1200 int too_quick = 0; 1201 char term[64], *env[2]; 1202 1203 if (current_time >= sp->se_started.tv_sec && 1204 current_time - sp->se_started.tv_sec < GETTY_SPACING) { 1205 if (++sp->se_nspace > GETTY_NSPACE) { 1206 sp->se_nspace = 0; 1207 too_quick = 1; 1208 } 1209 } else 1210 sp->se_nspace = 0; 1211 1212 /* 1213 * fork(), not vfork() -- we can't afford to block. 1214 */ 1215 if ((pid = fork()) == -1) { 1216 emergency("can't fork for getty on port %s: %m", sp->se_device); 1217 return -1; 1218 } 1219 1220 if (pid) 1221 return pid; 1222 1223 if (too_quick) { 1224 warning("getty repeating too quickly on port %s, sleeping %d secs", 1225 sp->se_device, GETTY_SLEEP); 1226 sleep((unsigned) GETTY_SLEEP); 1227 } 1228 1229 if (sp->se_window) { 1230 start_window_system(sp); 1231 sleep(WINDOW_WAIT); 1232 } 1233 1234 sigemptyset(&mask); 1235 sigprocmask(SIG_SETMASK, &mask, NULL); 1236 1237 #ifdef LOGIN_CAP 1238 setprocresources(RESOURCE_GETTY); 1239 #endif 1240 if (sp->se_type) { 1241 /* Don't use malloc after fork */ 1242 strcpy(term, "TERM="); 1243 strncat(term, sp->se_type, sizeof(term) - 6); 1244 env[0] = term; 1245 env[1] = 0; 1246 } 1247 else 1248 env[0] = 0; 1249 execve(sp->se_getty_argv[0], sp->se_getty_argv, env); 1250 stall("can't exec getty '%s' for port %s: %m", 1251 sp->se_getty_argv[0], sp->se_device); 1252 _exit(1); 1253 } 1254 1255 /* 1256 * Collect exit status for a child. 1257 * If an exiting login, start a new login running. 1258 */ 1259 static void 1260 collect_child(pid_t pid) 1261 { 1262 session_t *sp, *sprev, *snext; 1263 1264 if (! sessions) 1265 return; 1266 1267 if (! (sp = find_session(pid))) 1268 return; 1269 1270 clear_session_logs(sp); 1271 del_session(sp); 1272 sp->se_process = 0; 1273 1274 if (sp->se_flags & SE_SHUTDOWN) { 1275 if ((sprev = sp->se_prev) != NULL) 1276 sprev->se_next = sp->se_next; 1277 else 1278 sessions = sp->se_next; 1279 if ((snext = sp->se_next) != NULL) 1280 snext->se_prev = sp->se_prev; 1281 free_session(sp); 1282 return; 1283 } 1284 1285 if ((pid = start_getty(sp)) == -1) { 1286 /* serious trouble */ 1287 requested_transition = clean_ttys; 1288 return; 1289 } 1290 1291 sp->se_process = pid; 1292 gettimeofday(&sp->se_started, NULL); 1293 add_session(sp); 1294 } 1295 1296 /* 1297 * Catch a signal and request a state transition. 1298 */ 1299 static void 1300 transition_handler(int sig) 1301 { 1302 1303 switch (sig) { 1304 case SIGHUP: 1305 requested_transition = clean_ttys; 1306 break; 1307 case SIGUSR2: 1308 howto = RB_POWEROFF; 1309 case SIGUSR1: 1310 howto |= RB_HALT; 1311 case SIGINT: 1312 Reboot = TRUE; 1313 case SIGTERM: 1314 requested_transition = death; 1315 break; 1316 case SIGTSTP: 1317 requested_transition = catatonia; 1318 break; 1319 default: 1320 requested_transition = 0; 1321 break; 1322 } 1323 } 1324 1325 /* 1326 * Take the system multiuser. 1327 */ 1328 static state_func_t 1329 multi_user(void) 1330 { 1331 pid_t pid; 1332 session_t *sp; 1333 1334 requested_transition = 0; 1335 1336 /* 1337 * If the administrator has not set the security level to -1 1338 * to indicate that the kernel should not run multiuser in secure 1339 * mode, and the run script has not set a higher level of security 1340 * than level 1, then put the kernel into secure mode. 1341 */ 1342 if (getsecuritylevel() == 0) 1343 setsecuritylevel(1); 1344 1345 for (sp = sessions; sp; sp = sp->se_next) { 1346 if (sp->se_process) 1347 continue; 1348 if ((pid = start_getty(sp)) == -1) { 1349 /* serious trouble */ 1350 requested_transition = clean_ttys; 1351 break; 1352 } 1353 sp->se_process = pid; 1354 gettimeofday(&sp->se_started, NULL); 1355 add_session(sp); 1356 } 1357 1358 while (!requested_transition) 1359 if ((pid = waitpid(-1, NULL, 0)) != -1) 1360 collect_child(pid); 1361 1362 return (state_func_t) requested_transition; 1363 } 1364 1365 /* 1366 * This is an (n*2)+(n^2) algorithm. We hope it isn't run often... 1367 */ 1368 static state_func_t 1369 clean_ttys(void) 1370 { 1371 session_t *sp, *sprev; 1372 struct ttyent *typ; 1373 int session_index = 0; 1374 int devlen; 1375 char *old_getty, *old_window, *old_type; 1376 1377 if (! sessions) 1378 return (state_func_t) multi_user; 1379 1380 /* 1381 * mark all sessions for death, (!SE_PRESENT) 1382 * as we find or create new ones they'll be marked as keepers, 1383 * we'll later nuke all the ones not found in /etc/ttys 1384 */ 1385 for (sp = sessions; sp != NULL; sp = sp->se_next) 1386 sp->se_flags &= ~SE_PRESENT; 1387 1388 devlen = sizeof(_PATH_DEV) - 1; 1389 while ((typ = getttyent()) != NULL) { 1390 ++session_index; 1391 1392 for (sprev = 0, sp = sessions; sp; sprev = sp, sp = sp->se_next) 1393 if (strcmp(typ->ty_name, sp->se_device + devlen) == 0) 1394 break; 1395 1396 if (sp) { 1397 /* we want this one to live */ 1398 sp->se_flags |= SE_PRESENT; 1399 if (sp->se_index != session_index) { 1400 warning("port %s changed utmp index from %d to %d", 1401 sp->se_device, sp->se_index, 1402 session_index); 1403 sp->se_index = session_index; 1404 } 1405 if ((typ->ty_status & TTY_ON) == 0 || 1406 typ->ty_getty == 0) { 1407 sp->se_flags |= SE_SHUTDOWN; 1408 kill(sp->se_process, SIGHUP); 1409 continue; 1410 } 1411 sp->se_flags &= ~SE_SHUTDOWN; 1412 old_getty = sp->se_getty ? strdup(sp->se_getty) : 0; 1413 old_window = sp->se_window ? strdup(sp->se_window) : 0; 1414 old_type = sp->se_type ? strdup(sp->se_type) : 0; 1415 if (setupargv(sp, typ) == 0) { 1416 warning("can't parse getty for port %s", 1417 sp->se_device); 1418 sp->se_flags |= SE_SHUTDOWN; 1419 kill(sp->se_process, SIGHUP); 1420 } 1421 else if ( !old_getty 1422 || (!old_type && sp->se_type) 1423 || (old_type && !sp->se_type) 1424 || (!old_window && sp->se_window) 1425 || (old_window && !sp->se_window) 1426 || (strcmp(old_getty, sp->se_getty) != 0) 1427 || (old_window && strcmp(old_window, sp->se_window) != 0) 1428 || (old_type && strcmp(old_type, sp->se_type) != 0) 1429 ) { 1430 /* Don't set SE_SHUTDOWN here */ 1431 sp->se_nspace = 0; 1432 sp->se_started.tv_sec = sp->se_started.tv_usec = 0; 1433 kill(sp->se_process, SIGHUP); 1434 } 1435 if (old_getty) 1436 free(old_getty); 1437 if (old_window) 1438 free(old_window); 1439 if (old_type) 1440 free(old_type); 1441 continue; 1442 } 1443 1444 new_session(sprev, session_index, typ); 1445 } 1446 1447 endttyent(); 1448 1449 /* 1450 * sweep through and kill all deleted sessions 1451 * ones who's /etc/ttys line was deleted (SE_PRESENT unset) 1452 */ 1453 for (sp = sessions; sp != NULL; sp = sp->se_next) { 1454 if ((sp->se_flags & SE_PRESENT) == 0) { 1455 sp->se_flags |= SE_SHUTDOWN; 1456 kill(sp->se_process, SIGHUP); 1457 } 1458 } 1459 1460 return (state_func_t) multi_user; 1461 } 1462 1463 /* 1464 * Block further logins. 1465 */ 1466 static state_func_t 1467 catatonia(void) 1468 { 1469 session_t *sp; 1470 1471 for (sp = sessions; sp; sp = sp->se_next) 1472 sp->se_flags |= SE_SHUTDOWN; 1473 1474 return (state_func_t) multi_user; 1475 } 1476 1477 /* 1478 * Note SIGALRM. 1479 */ 1480 static void 1481 alrm_handler(int sig __unused) 1482 { 1483 clang = 1; 1484 } 1485 1486 /* 1487 * Bring the system down to single user. 1488 */ 1489 static state_func_t 1490 death(void) 1491 { 1492 session_t *sp; 1493 int i; 1494 pid_t pid; 1495 static const int death_sigs[2] = { SIGTERM, SIGKILL }; 1496 1497 /* NB: should send a message to the session logger to avoid blocking. */ 1498 #ifdef SUPPORT_UTMPX 1499 logwtmpx("~", "shutdown", "", 0, INIT_PROCESS); 1500 #endif 1501 logwtmp("~", "shutdown", ""); 1502 1503 for (sp = sessions; sp; sp = sp->se_next) { 1504 sp->se_flags |= SE_SHUTDOWN; 1505 kill(sp->se_process, SIGHUP); 1506 } 1507 1508 /* Try to run the rc.shutdown script within a period of time */ 1509 runshutdown(); 1510 1511 for (i = 0; i < 2; ++i) { 1512 if (kill(-1, death_sigs[i]) == -1 && errno == ESRCH) 1513 return (state_func_t) single_user; 1514 1515 clang = 0; 1516 alarm(DEATH_WATCH); 1517 do 1518 if ((pid = waitpid(-1, NULL, 0)) != -1) 1519 collect_child(pid); 1520 while (clang == 0 && errno != ECHILD); 1521 1522 if (errno == ECHILD) 1523 return (state_func_t) single_user; 1524 } 1525 1526 warning("some processes would not die; ps axl advised"); 1527 1528 return (state_func_t) single_user; 1529 } 1530 1531 /* 1532 * Run the system shutdown script. 1533 * 1534 * Exit codes: XXX I should document more 1535 * -2 shutdown script terminated abnormally 1536 * -1 fatal error - can't run script 1537 * 0 good. 1538 * >0 some error (exit code) 1539 */ 1540 static int 1541 runshutdown(void) 1542 { 1543 pid_t pid, wpid; 1544 int status; 1545 int shutdowntimeout; 1546 size_t len; 1547 const char *argv[4]; 1548 struct sigaction sa; 1549 struct stat sb; 1550 1551 /* 1552 * rc.shutdown is optional, so to prevent any unnecessary 1553 * complaints from the shell we simply don't run it if the 1554 * file does not exist. If the stat() here fails for other 1555 * reasons, we'll let the shell complain. 1556 */ 1557 if (stat(_PATH_RUNDOWN, &sb) == -1 && errno == ENOENT) 1558 return 0; 1559 1560 if ((pid = fork()) == 0) { 1561 int fd; 1562 1563 /* Assume that init already grab console as ctty before */ 1564 1565 sigemptyset(&sa.sa_mask); 1566 sa.sa_flags = 0; 1567 sa.sa_handler = SIG_IGN; 1568 sigaction(SIGTSTP, &sa, NULL); 1569 sigaction(SIGHUP, &sa, NULL); 1570 1571 if ((fd = open(_PATH_CONSOLE, O_RDWR)) == -1) 1572 warning("can't open %s: %m", _PATH_CONSOLE); 1573 else { 1574 dup2(fd, 0); 1575 dup2(fd, 1); 1576 dup2(fd, 2); 1577 if (fd > 2) 1578 close(fd); 1579 } 1580 1581 /* 1582 * Run the shutdown script. 1583 */ 1584 argv[0] = "sh"; 1585 argv[1] = _PATH_RUNDOWN; 1586 if (Reboot) 1587 argv[2] = "reboot"; 1588 else 1589 argv[2] = "single"; 1590 argv[3] = 0; 1591 1592 sigprocmask(SIG_SETMASK, &sa.sa_mask, NULL); 1593 1594 #ifdef LOGIN_CAP 1595 setprocresources(RESOURCE_RC); 1596 #endif 1597 execv(_PATH_BSHELL, __DECONST(char **, argv)); 1598 warning("can't exec %s for %s: %m", _PATH_BSHELL, _PATH_RUNDOWN); 1599 _exit(1); /* force single user mode */ 1600 } 1601 1602 if (pid == -1) { 1603 emergency("can't fork for %s on %s: %m", 1604 _PATH_BSHELL, _PATH_RUNDOWN); 1605 while (waitpid(-1, NULL, WNOHANG) > 0) 1606 continue; 1607 sleep(STALL_TIMEOUT); 1608 return -1; 1609 } 1610 1611 len = sizeof(shutdowntimeout); 1612 if (sysctlbyname("kern.shutdown_timeout", 1613 &shutdowntimeout, 1614 &len, NULL, 0) == -1 || shutdowntimeout < 2) 1615 shutdowntimeout = DEATH_SCRIPT; 1616 alarm(shutdowntimeout); 1617 clang = 0; 1618 /* 1619 * Copied from single_user(). This is a bit paranoid. 1620 * Use the same ALRM handler. 1621 */ 1622 do { 1623 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 1624 collect_child(wpid); 1625 if (clang == 1) { 1626 /* we were waiting for the sub-shell */ 1627 kill(wpid, SIGTERM); 1628 warning("timeout expired for %s on %s: %m; going to single user mode", 1629 _PATH_BSHELL, _PATH_RUNDOWN); 1630 return -1; 1631 } 1632 if (wpid == -1) { 1633 if (errno == EINTR) 1634 continue; 1635 warning("wait for %s on %s failed: %m; going to single user mode", 1636 _PATH_BSHELL, _PATH_RUNDOWN); 1637 return -1; 1638 } 1639 if (wpid == pid && WIFSTOPPED(status)) { 1640 warning("init: %s on %s stopped, restarting\n", 1641 _PATH_BSHELL, _PATH_RUNDOWN); 1642 kill(pid, SIGCONT); 1643 wpid = -1; 1644 } 1645 } while (wpid != pid && !clang); 1646 1647 /* Turn off the alarm */ 1648 alarm(0); 1649 1650 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGTERM && 1651 requested_transition == catatonia) { 1652 /* 1653 * /etc/rc.shutdown executed /sbin/reboot; 1654 * wait for the end quietly 1655 */ 1656 sigset_t s; 1657 1658 sigfillset(&s); 1659 for (;;) 1660 sigsuspend(&s); 1661 } 1662 1663 if (!WIFEXITED(status)) { 1664 warning("%s on %s terminated abnormally, going to single user mode", 1665 _PATH_BSHELL, _PATH_RUNDOWN); 1666 return -2; 1667 } 1668 1669 if ((status = WEXITSTATUS(status)) != 0) 1670 warning("%s returned status %d", _PATH_RUNDOWN, status); 1671 1672 return status; 1673 } 1674 1675 static char * 1676 strk(char *p) 1677 { 1678 static char *t; 1679 char *q; 1680 int c; 1681 1682 if (p) 1683 t = p; 1684 if (!t) 1685 return 0; 1686 1687 c = *t; 1688 while (c == ' ' || c == '\t' ) 1689 c = *++t; 1690 if (!c) { 1691 t = 0; 1692 return 0; 1693 } 1694 q = t; 1695 if (c == '\'') { 1696 c = *++t; 1697 q = t; 1698 while (c && c != '\'') 1699 c = *++t; 1700 if (!c) /* unterminated string */ 1701 q = t = 0; 1702 else 1703 *t++ = 0; 1704 } else { 1705 while (c && c != ' ' && c != '\t' ) 1706 c = *++t; 1707 *t++ = 0; 1708 if (!c) 1709 t = 0; 1710 } 1711 return q; 1712 } 1713 1714 #ifdef LOGIN_CAP 1715 static void 1716 setprocresources(const char *cname) 1717 { 1718 login_cap_t *lc; 1719 if ((lc = login_getclassbyname(cname, NULL)) != NULL) { 1720 setusercontext(lc, NULL, 0, LOGIN_SETPRIORITY|LOGIN_SETRESOURCES); 1721 login_close(lc); 1722 } 1723 } 1724 #endif 1725 1726 #ifdef SUPPORT_UTMPX 1727 static void 1728 session_utmpx(const session_t *sp, int add) 1729 { 1730 const char *name = sp->se_getty ? sp->se_getty : 1731 (sp->se_window ? sp->se_window : ""); 1732 const char *line = sp->se_device + sizeof(_PATH_DEV) - 1; 1733 1734 make_utmpx(name, line, add ? LOGIN_PROCESS : DEAD_PROCESS, 1735 sp->se_process, &sp->se_started, sp->se_index); 1736 } 1737 1738 static void 1739 make_utmpx(const char *name, const char *line, int type, pid_t pid, 1740 const struct timeval *tv, int session) 1741 { 1742 struct utmpx ut; 1743 const char *eline; 1744 1745 (void)memset(&ut, 0, sizeof(ut)); 1746 (void)strlcpy(ut.ut_name, name, sizeof(ut.ut_name)); 1747 ut.ut_type = type; 1748 (void)strlcpy(ut.ut_line, line, sizeof(ut.ut_line)); 1749 ut.ut_pid = pid; 1750 if (tv) 1751 ut.ut_tv = *tv; 1752 else 1753 (void)gettimeofday(&ut.ut_tv, NULL); 1754 ut.ut_session = session; 1755 1756 eline = line + strlen(line); 1757 if ((size_t)(eline - line) >= sizeof(ut.ut_id)) 1758 line = eline - sizeof(ut.ut_id); 1759 (void)strncpy(ut.ut_id, line, sizeof(ut.ut_id)); 1760 1761 if (pututxline(&ut) == NULL) 1762 warning("can't add utmpx record for `%s': %m", ut.ut_line); 1763 endutxent(); 1764 } 1765 1766 static char 1767 get_runlevel(const state_t s) 1768 { 1769 if (s == (state_t)single_user) 1770 return SINGLE_USER; 1771 if (s == (state_t)runcom) 1772 return RUNCOM; 1773 if (s == (state_t)read_ttys) 1774 return READ_TTYS; 1775 if (s == (state_t)multi_user) 1776 return MULTI_USER; 1777 if (s == (state_t)clean_ttys) 1778 return CLEAN_TTYS; 1779 if (s == (state_t)catatonia) 1780 return CATATONIA; 1781 return DEATH; 1782 } 1783 1784 static void 1785 utmpx_set_runlevel(char old, char new) 1786 { 1787 struct utmpx ut; 1788 1789 /* 1790 * Don't record any transitions until we did the first transition 1791 * to read ttys, which is when we are guaranteed to have a read-write 1792 * /var. Perhaps use a different variable for this? 1793 */ 1794 if (sessions == NULL) 1795 return; 1796 1797 (void)memset(&ut, 0, sizeof(ut)); 1798 (void)snprintf(ut.ut_line, sizeof(ut.ut_line), RUNLVL_MSG, new); 1799 ut.ut_type = RUN_LVL; 1800 (void)gettimeofday(&ut.ut_tv, NULL); 1801 ut.ut_exit.e_exit = old; 1802 ut.ut_exit.e_termination = new; 1803 if (pututxline(&ut) == NULL) 1804 warning("can't add utmpx record for `runlevel': %m"); 1805 endutxent(); 1806 } 1807 #endif 1808