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 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #ifndef lint 34 static const char copyright[] = 35 "@(#) Copyright (c) 1991, 1993\n\ 36 The Regents of the University of California. All rights reserved.\n"; 37 #endif /* not lint */ 38 39 #ifndef lint 40 #if 0 41 static char sccsid[] = "@(#)init.c 8.1 (Berkeley) 7/15/93"; 42 #endif 43 static const char rcsid[] = 44 "$FreeBSD$"; 45 #endif /* not lint */ 46 47 #include <sys/param.h> 48 #include <sys/ioctl.h> 49 #include <sys/mount.h> 50 #include <sys/sysctl.h> 51 #include <sys/wait.h> 52 #include <sys/stat.h> 53 #include <sys/uio.h> 54 55 #include <db.h> 56 #include <errno.h> 57 #include <fcntl.h> 58 #include <kenv.h> 59 #include <libutil.h> 60 #include <paths.h> 61 #include <signal.h> 62 #include <stdio.h> 63 #include <stdlib.h> 64 #include <string.h> 65 #include <syslog.h> 66 #include <time.h> 67 #include <ttyent.h> 68 #include <unistd.h> 69 #include <sys/reboot.h> 70 #include <err.h> 71 72 #include <stdarg.h> 73 74 #ifdef SECURE 75 #include <pwd.h> 76 #endif 77 78 #ifdef LOGIN_CAP 79 #include <login_cap.h> 80 #endif 81 82 #include "pathnames.h" 83 84 /* 85 * Sleep times; used to prevent thrashing. 86 */ 87 #define GETTY_SPACING 5 /* N secs minimum getty spacing */ 88 #define GETTY_SLEEP 30 /* sleep N secs after spacing problem */ 89 #define GETTY_NSPACE 3 /* max. spacing count to bring reaction */ 90 #define WINDOW_WAIT 3 /* wait N secs after starting window */ 91 #define STALL_TIMEOUT 30 /* wait N secs after warning */ 92 #define DEATH_WATCH 10 /* wait N secs for procs to die */ 93 #define DEATH_SCRIPT 120 /* wait for 2min for /etc/rc.shutdown */ 94 #define RESOURCE_RC "daemon" 95 #define RESOURCE_WINDOW "default" 96 #define RESOURCE_GETTY "default" 97 98 static void handle(sig_t, ...); 99 static void delset(sigset_t *, ...); 100 101 static void stall(const char *, ...) __printflike(1, 2); 102 static void warning(const char *, ...) __printflike(1, 2); 103 static void emergency(const char *, ...) __printflike(1, 2); 104 static void disaster(int); 105 static void badsys(int); 106 static int runshutdown(void); 107 static char *strk(char *); 108 109 /* 110 * We really need a recursive typedef... 111 * The following at least guarantees that the return type of (*state_t)() 112 * is sufficiently wide to hold a function pointer. 113 */ 114 typedef long (*state_func_t)(void); 115 typedef state_func_t (*state_t)(void); 116 117 static state_func_t single_user(void); 118 static state_func_t runcom(void); 119 static state_func_t read_ttys(void); 120 static state_func_t multi_user(void); 121 static state_func_t clean_ttys(void); 122 static state_func_t catatonia(void); 123 static state_func_t death(void); 124 static state_func_t death_single(void); 125 126 static state_func_t run_script(const char *); 127 128 static enum { AUTOBOOT, FASTBOOT } runcom_mode = AUTOBOOT; 129 #define FALSE 0 130 #define TRUE 1 131 132 static int Reboot = FALSE; 133 static int howto = RB_AUTOBOOT; 134 135 static int devfs; 136 137 static void transition(state_t); 138 static state_t requested_transition; 139 static state_t current_state = death_single; 140 141 static void open_console(void); 142 static const char *get_shell(void); 143 static void write_stderr(const char *message); 144 145 typedef struct init_session { 146 int se_index; /* index of entry in ttys file */ 147 pid_t se_process; /* controlling process */ 148 time_t se_started; /* used to avoid thrashing */ 149 int se_flags; /* status of session */ 150 #define SE_SHUTDOWN 0x1 /* session won't be restarted */ 151 #define SE_PRESENT 0x2 /* session is in /etc/ttys */ 152 int se_nspace; /* spacing count */ 153 char *se_device; /* filename of port */ 154 char *se_getty; /* what to run on that port */ 155 char *se_getty_argv_space; /* pre-parsed argument array space */ 156 char **se_getty_argv; /* pre-parsed argument array */ 157 char *se_window; /* window system (started only once) */ 158 char *se_window_argv_space; /* pre-parsed argument array space */ 159 char **se_window_argv; /* pre-parsed argument array */ 160 char *se_type; /* default terminal type */ 161 struct init_session *se_prev; 162 struct init_session *se_next; 163 } session_t; 164 165 static void free_session(session_t *); 166 static session_t *new_session(session_t *, int, struct ttyent *); 167 static session_t *sessions; 168 169 static char **construct_argv(char *); 170 static void start_window_system(session_t *); 171 static void collect_child(pid_t); 172 static pid_t start_getty(session_t *); 173 static void transition_handler(int); 174 static void alrm_handler(int); 175 static void setsecuritylevel(int); 176 static int getsecuritylevel(void); 177 static int setupargv(session_t *, struct ttyent *); 178 #ifdef LOGIN_CAP 179 static void setprocresources(const char *); 180 #endif 181 static int clang; 182 183 static int start_session_db(void); 184 static void add_session(session_t *); 185 static void del_session(session_t *); 186 static session_t *find_session(pid_t); 187 static DB *session_db; 188 189 /* 190 * The mother of all processes. 191 */ 192 int 193 main(int argc, char *argv[]) 194 { 195 state_t initial_transition = runcom; 196 char kenv_value[PATH_MAX]; 197 int c; 198 struct sigaction sa; 199 sigset_t mask; 200 201 /* Dispose of random users. */ 202 if (getuid() != 0) 203 errx(1, "%s", strerror(EPERM)); 204 205 /* System V users like to reexec init. */ 206 if (getpid() != 1) { 207 #ifdef COMPAT_SYSV_INIT 208 /* So give them what they want */ 209 if (argc > 1) { 210 if (strlen(argv[1]) == 1) { 211 char runlevel = *argv[1]; 212 int sig; 213 214 switch (runlevel) { 215 case '0': /* halt + poweroff */ 216 sig = SIGUSR2; 217 break; 218 case '1': /* single-user */ 219 sig = SIGTERM; 220 break; 221 case '6': /* reboot */ 222 sig = SIGINT; 223 break; 224 case 'c': /* block further logins */ 225 sig = SIGTSTP; 226 break; 227 case 'q': /* rescan /etc/ttys */ 228 sig = SIGHUP; 229 break; 230 default: 231 goto invalid; 232 } 233 kill(1, sig); 234 _exit(0); 235 } else 236 invalid: 237 errx(1, "invalid run-level ``%s''", argv[1]); 238 } else 239 #endif 240 errx(1, "already running"); 241 } 242 /* 243 * Note that this does NOT open a file... 244 * Does 'init' deserve its own facility number? 245 */ 246 openlog("init", LOG_CONS|LOG_ODELAY, LOG_AUTH); 247 248 /* 249 * Create an initial session. 250 */ 251 if (setsid() < 0) 252 warning("initial setsid() failed: %m"); 253 254 /* 255 * Establish an initial user so that programs running 256 * single user do not freak out and die (like passwd). 257 */ 258 if (setlogin("root") < 0) 259 warning("setlogin() failed: %m"); 260 261 /* 262 * This code assumes that we always get arguments through flags, 263 * never through bits set in some random machine register. 264 */ 265 while ((c = getopt(argc, argv, "dsf")) != -1) 266 switch (c) { 267 case 'd': 268 devfs = 1; 269 break; 270 case 's': 271 initial_transition = single_user; 272 break; 273 case 'f': 274 runcom_mode = FASTBOOT; 275 break; 276 default: 277 warning("unrecognized flag '-%c'", c); 278 break; 279 } 280 281 if (optind != argc) 282 warning("ignoring excess arguments"); 283 284 /* 285 * We catch or block signals rather than ignore them, 286 * so that they get reset on exec. 287 */ 288 handle(badsys, SIGSYS, 0); 289 handle(disaster, SIGABRT, SIGFPE, SIGILL, SIGSEGV, SIGBUS, SIGXCPU, 290 SIGXFSZ, 0); 291 handle(transition_handler, SIGHUP, SIGINT, SIGTERM, SIGTSTP, SIGUSR1, 292 SIGUSR2, 0); 293 handle(alrm_handler, SIGALRM, 0); 294 sigfillset(&mask); 295 delset(&mask, SIGABRT, SIGFPE, SIGILL, SIGSEGV, SIGBUS, SIGSYS, 296 SIGXCPU, SIGXFSZ, SIGHUP, SIGINT, SIGTERM, SIGTSTP, SIGALRM, 297 SIGUSR1, SIGUSR2, 0); 298 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0); 299 sigemptyset(&sa.sa_mask); 300 sa.sa_flags = 0; 301 sa.sa_handler = SIG_IGN; 302 sigaction(SIGTTIN, &sa, (struct sigaction *)0); 303 sigaction(SIGTTOU, &sa, (struct sigaction *)0); 304 305 /* 306 * Paranoia. 307 */ 308 close(0); 309 close(1); 310 close(2); 311 312 if (kenv(KENV_GET, "init_script", kenv_value, sizeof(kenv_value)) > 0) { 313 state_func_t next_transition; 314 315 if ((next_transition = run_script(kenv_value)) != 0) 316 initial_transition = (state_t) next_transition; 317 } 318 319 if (kenv(KENV_GET, "init_chroot", kenv_value, sizeof(kenv_value)) > 0) { 320 if (chdir(kenv_value) != 0 || chroot(".") != 0) 321 warning("Can't chroot to %s: %m", kenv_value); 322 } 323 324 /* 325 * Additional check if devfs needs to be mounted: 326 * If "/" and "/dev" have the same device number, 327 * then it hasn't been mounted yet. 328 */ 329 if (!devfs) { 330 struct stat stst; 331 dev_t root_devno; 332 333 stat("/", &stst); 334 root_devno = stst.st_dev; 335 if (stat("/dev", &stst) != 0) 336 warning("Can't stat /dev: %m"); 337 else if (stst.st_dev == root_devno) 338 devfs++; 339 } 340 341 if (devfs) { 342 struct iovec iov[4]; 343 char *s; 344 int i; 345 346 char _fstype[] = "fstype"; 347 char _devfs[] = "devfs"; 348 char _fspath[] = "fspath"; 349 char _path_dev[]= _PATH_DEV; 350 351 iov[0].iov_base = _fstype; 352 iov[0].iov_len = sizeof(_fstype); 353 iov[1].iov_base = _devfs; 354 iov[1].iov_len = sizeof(_devfs); 355 iov[2].iov_base = _fspath; 356 iov[2].iov_len = sizeof(_fspath); 357 /* 358 * Try to avoid the trailing slash in _PATH_DEV. 359 * Be *very* defensive. 360 */ 361 s = strdup(_PATH_DEV); 362 if (s != NULL) { 363 i = strlen(s); 364 if (i > 0 && s[i - 1] == '/') 365 s[i - 1] = '\0'; 366 iov[3].iov_base = s; 367 iov[3].iov_len = strlen(s) + 1; 368 } else { 369 iov[3].iov_base = _path_dev; 370 iov[3].iov_len = sizeof(_path_dev); 371 } 372 nmount(iov, 4, 0); 373 if (s != NULL) 374 free(s); 375 } 376 377 /* 378 * Start the state machine. 379 */ 380 transition(initial_transition); 381 382 /* 383 * Should never reach here. 384 */ 385 return 1; 386 } 387 388 /* 389 * Associate a function with a signal handler. 390 */ 391 static void 392 handle(sig_t handler, ...) 393 { 394 int sig; 395 struct sigaction sa; 396 sigset_t mask_everything; 397 va_list ap; 398 va_start(ap, handler); 399 400 sa.sa_handler = handler; 401 sigfillset(&mask_everything); 402 403 while ((sig = va_arg(ap, int)) != 0) { 404 sa.sa_mask = mask_everything; 405 /* XXX SA_RESTART? */ 406 sa.sa_flags = sig == SIGCHLD ? SA_NOCLDSTOP : 0; 407 sigaction(sig, &sa, (struct sigaction *) 0); 408 } 409 va_end(ap); 410 } 411 412 /* 413 * Delete a set of signals from a mask. 414 */ 415 static void 416 delset(sigset_t *maskp, ...) 417 { 418 int sig; 419 va_list ap; 420 va_start(ap, maskp); 421 422 while ((sig = va_arg(ap, int)) != 0) 423 sigdelset(maskp, sig); 424 va_end(ap); 425 } 426 427 /* 428 * Log a message and sleep for a while (to give someone an opportunity 429 * to read it and to save log or hardcopy output if the problem is chronic). 430 * NB: should send a message to the session logger to avoid blocking. 431 */ 432 static void 433 stall(const char *message, ...) 434 { 435 va_list ap; 436 va_start(ap, message); 437 438 vsyslog(LOG_ALERT, message, ap); 439 va_end(ap); 440 sleep(STALL_TIMEOUT); 441 } 442 443 /* 444 * Like stall(), but doesn't sleep. 445 * If cpp had variadic macros, the two functions could be #defines for another. 446 * NB: should send a message to the session logger to avoid blocking. 447 */ 448 static void 449 warning(const char *message, ...) 450 { 451 va_list ap; 452 va_start(ap, message); 453 454 vsyslog(LOG_ALERT, message, ap); 455 va_end(ap); 456 } 457 458 /* 459 * Log an emergency message. 460 * NB: should send a message to the session logger to avoid blocking. 461 */ 462 static void 463 emergency(const char *message, ...) 464 { 465 va_list ap; 466 va_start(ap, message); 467 468 vsyslog(LOG_EMERG, message, ap); 469 va_end(ap); 470 } 471 472 /* 473 * Catch a SIGSYS signal. 474 * 475 * These may arise if a system does not support sysctl. 476 * We tolerate up to 25 of these, then throw in the towel. 477 */ 478 static void 479 badsys(int sig) 480 { 481 static int badcount = 0; 482 483 if (badcount++ < 25) 484 return; 485 disaster(sig); 486 } 487 488 /* 489 * Catch an unexpected signal. 490 */ 491 static void 492 disaster(int sig) 493 { 494 495 emergency("fatal signal: %s", 496 (unsigned)sig < NSIG ? sys_siglist[sig] : "unknown signal"); 497 498 sleep(STALL_TIMEOUT); 499 _exit(sig); /* reboot */ 500 } 501 502 /* 503 * Get the security level of the kernel. 504 */ 505 static int 506 getsecuritylevel(void) 507 { 508 #ifdef KERN_SECURELVL 509 int name[2], curlevel; 510 size_t len; 511 512 name[0] = CTL_KERN; 513 name[1] = KERN_SECURELVL; 514 len = sizeof curlevel; 515 if (sysctl(name, 2, &curlevel, &len, NULL, 0) == -1) { 516 emergency("cannot get kernel security level: %s", 517 strerror(errno)); 518 return (-1); 519 } 520 return (curlevel); 521 #else 522 return (-1); 523 #endif 524 } 525 526 /* 527 * Set the security level of the kernel. 528 */ 529 static void 530 setsecuritylevel(int newlevel) 531 { 532 #ifdef KERN_SECURELVL 533 int name[2], curlevel; 534 535 curlevel = getsecuritylevel(); 536 if (newlevel == curlevel) 537 return; 538 name[0] = CTL_KERN; 539 name[1] = KERN_SECURELVL; 540 if (sysctl(name, 2, NULL, NULL, &newlevel, sizeof newlevel) == -1) { 541 emergency( 542 "cannot change kernel security level from %d to %d: %s", 543 curlevel, newlevel, strerror(errno)); 544 return; 545 } 546 #ifdef SECURE 547 warning("kernel security level changed from %d to %d", 548 curlevel, newlevel); 549 #endif 550 #endif 551 } 552 553 /* 554 * Change states in the finite state machine. 555 * The initial state is passed as an argument. 556 */ 557 static void 558 transition(state_t s) 559 { 560 561 current_state = s; 562 for (;;) 563 current_state = (state_t) (*current_state)(); 564 } 565 566 /* 567 * Start a session and allocate a controlling terminal. 568 * Only called by children of init after forking. 569 */ 570 static void 571 open_console(void) 572 { 573 int fd; 574 575 /* Try to open /dev/console. */ 576 revoke(_PATH_CONSOLE); 577 if ((fd = open(_PATH_CONSOLE, O_RDWR | O_NONBLOCK)) != -1) { 578 if (login_tty(fd) == 0) 579 return; 580 close(fd); 581 } 582 583 /* No luck. Log output to file if possible. */ 584 if ((fd = open(_PATH_DEVNULL, O_RDWR)) == -1) { 585 stall("cannot open null device."); 586 _exit(1); 587 } 588 if (fd != STDIN_FILENO) { 589 dup2(fd, STDIN_FILENO); 590 close(fd); 591 } 592 fd = open(_PATH_INITLOG, O_WRONLY | O_APPEND | O_CREAT, 0644); 593 if (fd == -1) 594 dup2(STDIN_FILENO, STDOUT_FILENO); 595 else if (fd != STDOUT_FILENO) { 596 dup2(fd, STDOUT_FILENO); 597 close(fd); 598 } 599 dup2(STDOUT_FILENO, STDERR_FILENO); 600 } 601 602 static const char * 603 get_shell(void) 604 { 605 static char kenv_value[PATH_MAX]; 606 607 if (kenv(KENV_GET, "init_shell", kenv_value, sizeof(kenv_value)) > 0) 608 return kenv_value; 609 else 610 return _PATH_BSHELL; 611 } 612 613 static void 614 write_stderr(const char *message) 615 { 616 617 write(STDERR_FILENO, message, strlen(message)); 618 } 619 620 /* 621 * Bring the system up single user. 622 */ 623 static state_func_t 624 single_user(void) 625 { 626 pid_t pid, wpid; 627 int status; 628 sigset_t mask; 629 const char *shell; 630 char *argv[2]; 631 #ifdef SECURE 632 struct ttyent *typ; 633 struct passwd *pp; 634 static const char banner[] = 635 "Enter root password, or ^D to go multi-user\n"; 636 char *clear, *password; 637 #endif 638 #ifdef DEBUGSHELL 639 char altshell[128]; 640 #endif 641 642 if (Reboot) { 643 /* Instead of going single user, let's reboot the machine */ 644 sync(); 645 alarm(2); 646 pause(); 647 reboot(howto); 648 _exit(0); 649 } 650 651 shell = get_shell(); 652 653 if ((pid = fork()) == 0) { 654 /* 655 * Start the single user session. 656 */ 657 open_console(); 658 659 #ifdef SECURE 660 /* 661 * Check the root password. 662 * We don't care if the console is 'on' by default; 663 * it's the only tty that can be 'off' and 'secure'. 664 */ 665 typ = getttynam("console"); 666 pp = getpwnam("root"); 667 if (typ && (typ->ty_status & TTY_SECURE) == 0 && 668 pp && *pp->pw_passwd) { 669 write_stderr(banner); 670 for (;;) { 671 clear = getpass("Password:"); 672 if (clear == 0 || *clear == '\0') 673 _exit(0); 674 password = crypt(clear, pp->pw_passwd); 675 bzero(clear, _PASSWORD_LEN); 676 if (password == NULL || 677 strcmp(password, pp->pw_passwd) == 0) 678 break; 679 warning("single-user login failed\n"); 680 } 681 } 682 endttyent(); 683 endpwent(); 684 #endif /* SECURE */ 685 686 #ifdef DEBUGSHELL 687 { 688 char *cp = altshell; 689 int num; 690 691 #define SHREQUEST "Enter full pathname of shell or RETURN for " 692 write_stderr(SHREQUEST); 693 write_stderr(shell); 694 write_stderr(": "); 695 while ((num = read(STDIN_FILENO, cp, 1)) != -1 && 696 num != 0 && *cp != '\n' && cp < &altshell[127]) 697 cp++; 698 *cp = '\0'; 699 if (altshell[0] != '\0') 700 shell = altshell; 701 } 702 #endif /* DEBUGSHELL */ 703 704 /* 705 * Unblock signals. 706 * We catch all the interesting ones, 707 * and those are reset to SIG_DFL on exec. 708 */ 709 sigemptyset(&mask); 710 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0); 711 712 /* 713 * Fire off a shell. 714 * If the default one doesn't work, try the Bourne shell. 715 */ 716 717 char name[] = "-sh"; 718 719 argv[0] = name; 720 argv[1] = 0; 721 execv(shell, argv); 722 emergency("can't exec %s for single user: %m", shell); 723 execv(_PATH_BSHELL, argv); 724 emergency("can't exec %s for single user: %m", _PATH_BSHELL); 725 sleep(STALL_TIMEOUT); 726 _exit(1); 727 } 728 729 if (pid == -1) { 730 /* 731 * We are seriously hosed. Do our best. 732 */ 733 emergency("can't fork single-user shell, trying again"); 734 while (waitpid(-1, (int *) 0, WNOHANG) > 0) 735 continue; 736 return (state_func_t) single_user; 737 } 738 739 requested_transition = 0; 740 do { 741 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 742 collect_child(wpid); 743 if (wpid == -1) { 744 if (errno == EINTR) 745 continue; 746 warning("wait for single-user shell failed: %m; restarting"); 747 return (state_func_t) single_user; 748 } 749 if (wpid == pid && WIFSTOPPED(status)) { 750 warning("init: shell stopped, restarting\n"); 751 kill(pid, SIGCONT); 752 wpid = -1; 753 } 754 } while (wpid != pid && !requested_transition); 755 756 if (requested_transition) 757 return (state_func_t) requested_transition; 758 759 if (!WIFEXITED(status)) { 760 if (WTERMSIG(status) == SIGKILL) { 761 /* 762 * reboot(8) killed shell? 763 */ 764 warning("single user shell terminated."); 765 sleep(STALL_TIMEOUT); 766 _exit(0); 767 } else { 768 warning("single user shell terminated, restarting"); 769 return (state_func_t) single_user; 770 } 771 } 772 773 runcom_mode = FASTBOOT; 774 return (state_func_t) runcom; 775 } 776 777 /* 778 * Run the system startup script. 779 */ 780 static state_func_t 781 runcom(void) 782 { 783 state_func_t next_transition; 784 785 if ((next_transition = run_script(_PATH_RUNCOM)) != 0) 786 return next_transition; 787 788 runcom_mode = AUTOBOOT; /* the default */ 789 return (state_func_t) read_ttys; 790 } 791 792 /* 793 * Run a shell script. 794 * Returns 0 on success, otherwise the next transition to enter: 795 * - single_user if fork/execv/waitpid failed, or if the script 796 * terminated with a signal or exit code != 0. 797 * - death_single if a SIGTERM was delivered to init(8). 798 */ 799 static state_func_t 800 run_script(const char *script) 801 { 802 pid_t pid, wpid; 803 int status; 804 char *argv[4]; 805 const char *shell; 806 struct sigaction sa; 807 808 shell = get_shell(); 809 810 if ((pid = fork()) == 0) { 811 sigemptyset(&sa.sa_mask); 812 sa.sa_flags = 0; 813 sa.sa_handler = SIG_IGN; 814 sigaction(SIGTSTP, &sa, (struct sigaction *)0); 815 sigaction(SIGHUP, &sa, (struct sigaction *)0); 816 817 open_console(); 818 819 char _sh[] = "sh"; 820 char _autoboot[] = "autoboot"; 821 822 argv[0] = _sh; 823 argv[1] = __DECONST(char *, script); 824 argv[2] = runcom_mode == AUTOBOOT ? _autoboot : 0; 825 argv[3] = 0; 826 827 sigprocmask(SIG_SETMASK, &sa.sa_mask, (sigset_t *) 0); 828 829 #ifdef LOGIN_CAP 830 setprocresources(RESOURCE_RC); 831 #endif 832 execv(shell, argv); 833 stall("can't exec %s for %s: %m", shell, script); 834 _exit(1); /* force single user mode */ 835 } 836 837 if (pid == -1) { 838 emergency("can't fork for %s on %s: %m", shell, script); 839 while (waitpid(-1, (int *) 0, WNOHANG) > 0) 840 continue; 841 sleep(STALL_TIMEOUT); 842 return (state_func_t) single_user; 843 } 844 845 /* 846 * Copied from single_user(). This is a bit paranoid. 847 */ 848 requested_transition = 0; 849 do { 850 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 851 collect_child(wpid); 852 if (wpid == -1) { 853 if (requested_transition == death_single) 854 return (state_func_t) death_single; 855 if (errno == EINTR) 856 continue; 857 warning("wait for %s on %s failed: %m; going to " 858 "single user mode", shell, script); 859 return (state_func_t) single_user; 860 } 861 if (wpid == pid && WIFSTOPPED(status)) { 862 warning("init: %s on %s stopped, restarting\n", 863 shell, script); 864 kill(pid, SIGCONT); 865 wpid = -1; 866 } 867 } while (wpid != pid); 868 869 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGTERM && 870 requested_transition == catatonia) { 871 /* /etc/rc executed /sbin/reboot; wait for the end quietly */ 872 sigset_t s; 873 874 sigfillset(&s); 875 for (;;) 876 sigsuspend(&s); 877 } 878 879 if (!WIFEXITED(status)) { 880 warning("%s on %s terminated abnormally, going to single " 881 "user mode", shell, script); 882 return (state_func_t) single_user; 883 } 884 885 if (WEXITSTATUS(status)) 886 return (state_func_t) single_user; 887 888 return (state_func_t) 0; 889 } 890 891 /* 892 * Open the session database. 893 * 894 * NB: We could pass in the size here; is it necessary? 895 */ 896 static int 897 start_session_db(void) 898 { 899 if (session_db && (*session_db->close)(session_db)) 900 emergency("session database close: %s", strerror(errno)); 901 if ((session_db = dbopen(NULL, O_RDWR, 0, DB_HASH, NULL)) == 0) { 902 emergency("session database open: %s", strerror(errno)); 903 return (1); 904 } 905 return (0); 906 907 } 908 909 /* 910 * Add a new login session. 911 */ 912 static void 913 add_session(session_t *sp) 914 { 915 DBT key; 916 DBT data; 917 918 key.data = &sp->se_process; 919 key.size = sizeof sp->se_process; 920 data.data = &sp; 921 data.size = sizeof sp; 922 923 if ((*session_db->put)(session_db, &key, &data, 0)) 924 emergency("insert %d: %s", sp->se_process, strerror(errno)); 925 } 926 927 /* 928 * Delete an old login session. 929 */ 930 static void 931 del_session(session_t *sp) 932 { 933 DBT key; 934 935 key.data = &sp->se_process; 936 key.size = sizeof sp->se_process; 937 938 if ((*session_db->del)(session_db, &key, 0)) 939 emergency("delete %d: %s", sp->se_process, strerror(errno)); 940 } 941 942 /* 943 * Look up a login session by pid. 944 */ 945 static session_t * 946 find_session(pid_t pid) 947 { 948 DBT key; 949 DBT data; 950 session_t *ret; 951 952 key.data = &pid; 953 key.size = sizeof pid; 954 if ((*session_db->get)(session_db, &key, &data, 0) != 0) 955 return 0; 956 bcopy(data.data, (char *)&ret, sizeof(ret)); 957 return ret; 958 } 959 960 /* 961 * Construct an argument vector from a command line. 962 */ 963 static char ** 964 construct_argv(char *command) 965 { 966 int argc = 0; 967 char **argv = (char **) malloc(((strlen(command) + 1) / 2 + 1) 968 * sizeof (char *)); 969 970 if ((argv[argc++] = strk(command)) == 0) { 971 free(argv); 972 return (NULL); 973 } 974 while ((argv[argc++] = strk((char *) 0)) != NULL) 975 continue; 976 return argv; 977 } 978 979 /* 980 * Deallocate a session descriptor. 981 */ 982 static void 983 free_session(session_t *sp) 984 { 985 free(sp->se_device); 986 if (sp->se_getty) { 987 free(sp->se_getty); 988 free(sp->se_getty_argv_space); 989 free(sp->se_getty_argv); 990 } 991 if (sp->se_window) { 992 free(sp->se_window); 993 free(sp->se_window_argv_space); 994 free(sp->se_window_argv); 995 } 996 if (sp->se_type) 997 free(sp->se_type); 998 free(sp); 999 } 1000 1001 /* 1002 * Allocate a new session descriptor. 1003 * Mark it SE_PRESENT. 1004 */ 1005 static session_t * 1006 new_session(session_t *sprev, int session_index, struct ttyent *typ) 1007 { 1008 session_t *sp; 1009 int fd; 1010 1011 if ((typ->ty_status & TTY_ON) == 0 || 1012 typ->ty_name == 0 || 1013 typ->ty_getty == 0) 1014 return 0; 1015 1016 sp = (session_t *) calloc(1, sizeof (session_t)); 1017 1018 sp->se_index = session_index; 1019 sp->se_flags |= SE_PRESENT; 1020 1021 sp->se_device = malloc(sizeof(_PATH_DEV) + strlen(typ->ty_name)); 1022 sprintf(sp->se_device, "%s%s", _PATH_DEV, typ->ty_name); 1023 1024 /* 1025 * Attempt to open the device, if we get "device not configured" 1026 * then don't add the device to the session list. 1027 */ 1028 if ((fd = open(sp->se_device, O_RDONLY | O_NONBLOCK, 0)) < 0) { 1029 if (errno == ENXIO) { 1030 free_session(sp); 1031 return (0); 1032 } 1033 } else 1034 close(fd); 1035 1036 if (setupargv(sp, typ) == 0) { 1037 free_session(sp); 1038 return (0); 1039 } 1040 1041 sp->se_next = 0; 1042 if (sprev == 0) { 1043 sessions = sp; 1044 sp->se_prev = 0; 1045 } else { 1046 sprev->se_next = sp; 1047 sp->se_prev = sprev; 1048 } 1049 1050 return sp; 1051 } 1052 1053 /* 1054 * Calculate getty and if useful window argv vectors. 1055 */ 1056 static int 1057 setupargv(session_t *sp, struct ttyent *typ) 1058 { 1059 1060 if (sp->se_getty) { 1061 free(sp->se_getty); 1062 free(sp->se_getty_argv_space); 1063 free(sp->se_getty_argv); 1064 } 1065 sp->se_getty = malloc(strlen(typ->ty_getty) + strlen(typ->ty_name) + 2); 1066 sprintf(sp->se_getty, "%s %s", typ->ty_getty, typ->ty_name); 1067 sp->se_getty_argv_space = strdup(sp->se_getty); 1068 sp->se_getty_argv = construct_argv(sp->se_getty_argv_space); 1069 if (sp->se_getty_argv == 0) { 1070 warning("can't parse getty for port %s", sp->se_device); 1071 free(sp->se_getty); 1072 free(sp->se_getty_argv_space); 1073 sp->se_getty = sp->se_getty_argv_space = 0; 1074 return (0); 1075 } 1076 if (sp->se_window) { 1077 free(sp->se_window); 1078 free(sp->se_window_argv_space); 1079 free(sp->se_window_argv); 1080 } 1081 sp->se_window = sp->se_window_argv_space = 0; 1082 sp->se_window_argv = 0; 1083 if (typ->ty_window) { 1084 sp->se_window = strdup(typ->ty_window); 1085 sp->se_window_argv_space = strdup(sp->se_window); 1086 sp->se_window_argv = construct_argv(sp->se_window_argv_space); 1087 if (sp->se_window_argv == 0) { 1088 warning("can't parse window for port %s", 1089 sp->se_device); 1090 free(sp->se_window_argv_space); 1091 free(sp->se_window); 1092 sp->se_window = sp->se_window_argv_space = 0; 1093 return (0); 1094 } 1095 } 1096 if (sp->se_type) 1097 free(sp->se_type); 1098 sp->se_type = typ->ty_type ? strdup(typ->ty_type) : 0; 1099 return (1); 1100 } 1101 1102 /* 1103 * Walk the list of ttys and create sessions for each active line. 1104 */ 1105 static state_func_t 1106 read_ttys(void) 1107 { 1108 int session_index = 0; 1109 session_t *sp, *snext; 1110 struct ttyent *typ; 1111 1112 /* 1113 * Destroy any previous session state. 1114 * There shouldn't be any, but just in case... 1115 */ 1116 for (sp = sessions; sp; sp = snext) { 1117 snext = sp->se_next; 1118 free_session(sp); 1119 } 1120 sessions = 0; 1121 if (start_session_db()) 1122 return (state_func_t) single_user; 1123 1124 /* 1125 * Allocate a session entry for each active port. 1126 * Note that sp starts at 0. 1127 */ 1128 while ((typ = getttyent()) != NULL) 1129 if ((snext = new_session(sp, ++session_index, typ)) != NULL) 1130 sp = snext; 1131 1132 endttyent(); 1133 1134 return (state_func_t) multi_user; 1135 } 1136 1137 /* 1138 * Start a window system running. 1139 */ 1140 static void 1141 start_window_system(session_t *sp) 1142 { 1143 pid_t pid; 1144 sigset_t mask; 1145 char term[64], *env[2]; 1146 int status; 1147 1148 if ((pid = fork()) == -1) { 1149 emergency("can't fork for window system on port %s: %m", 1150 sp->se_device); 1151 /* hope that getty fails and we can try again */ 1152 return; 1153 } 1154 if (pid) { 1155 waitpid(-1, &status, 0); 1156 return; 1157 } 1158 1159 /* reparent window process to the init to not make a zombie on exit */ 1160 if ((pid = fork()) == -1) { 1161 emergency("can't fork for window system on port %s: %m", 1162 sp->se_device); 1163 _exit(1); 1164 } 1165 if (pid) 1166 _exit(0); 1167 1168 sigemptyset(&mask); 1169 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0); 1170 1171 if (setsid() < 0) 1172 emergency("setsid failed (window) %m"); 1173 1174 #ifdef LOGIN_CAP 1175 setprocresources(RESOURCE_WINDOW); 1176 #endif 1177 if (sp->se_type) { 1178 /* Don't use malloc after fork */ 1179 strcpy(term, "TERM="); 1180 strncat(term, sp->se_type, sizeof(term) - 6); 1181 env[0] = term; 1182 env[1] = 0; 1183 } 1184 else 1185 env[0] = 0; 1186 execve(sp->se_window_argv[0], sp->se_window_argv, env); 1187 stall("can't exec window system '%s' for port %s: %m", 1188 sp->se_window_argv[0], sp->se_device); 1189 _exit(1); 1190 } 1191 1192 /* 1193 * Start a login session running. 1194 */ 1195 static pid_t 1196 start_getty(session_t *sp) 1197 { 1198 pid_t pid; 1199 sigset_t mask; 1200 time_t current_time = time((time_t *) 0); 1201 int too_quick = 0; 1202 char term[64], *env[2]; 1203 1204 if (current_time >= sp->se_started && 1205 current_time - sp->se_started < GETTY_SPACING) { 1206 if (++sp->se_nspace > GETTY_NSPACE) { 1207 sp->se_nspace = 0; 1208 too_quick = 1; 1209 } 1210 } else 1211 sp->se_nspace = 0; 1212 1213 /* 1214 * fork(), not vfork() -- we can't afford to block. 1215 */ 1216 if ((pid = fork()) == -1) { 1217 emergency("can't fork for getty on port %s: %m", sp->se_device); 1218 return -1; 1219 } 1220 1221 if (pid) 1222 return pid; 1223 1224 if (too_quick) { 1225 warning("getty repeating too quickly on port %s, sleeping %d secs", 1226 sp->se_device, GETTY_SLEEP); 1227 sleep((unsigned) GETTY_SLEEP); 1228 } 1229 1230 if (sp->se_window) { 1231 start_window_system(sp); 1232 sleep(WINDOW_WAIT); 1233 } 1234 1235 sigemptyset(&mask); 1236 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0); 1237 1238 #ifdef LOGIN_CAP 1239 setprocresources(RESOURCE_GETTY); 1240 #endif 1241 if (sp->se_type) { 1242 /* Don't use malloc after fork */ 1243 strcpy(term, "TERM="); 1244 strncat(term, sp->se_type, sizeof(term) - 6); 1245 env[0] = term; 1246 env[1] = 0; 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 del_session(sp); 1271 sp->se_process = 0; 1272 1273 if (sp->se_flags & SE_SHUTDOWN) { 1274 if ((sprev = sp->se_prev) != NULL) 1275 sprev->se_next = sp->se_next; 1276 else 1277 sessions = sp->se_next; 1278 if ((snext = sp->se_next) != NULL) 1279 snext->se_prev = sp->se_prev; 1280 free_session(sp); 1281 return; 1282 } 1283 1284 if ((pid = start_getty(sp)) == -1) { 1285 /* serious trouble */ 1286 requested_transition = clean_ttys; 1287 return; 1288 } 1289 1290 sp->se_process = pid; 1291 sp->se_started = time((time_t *) 0); 1292 add_session(sp); 1293 } 1294 1295 /* 1296 * Catch a signal and request a state transition. 1297 */ 1298 static void 1299 transition_handler(int sig) 1300 { 1301 1302 switch (sig) { 1303 case SIGHUP: 1304 if (current_state == read_ttys || current_state == multi_user || 1305 current_state == clean_ttys || current_state == catatonia) 1306 requested_transition = clean_ttys; 1307 break; 1308 case SIGUSR2: 1309 howto = RB_POWEROFF; 1310 case SIGUSR1: 1311 howto |= RB_HALT; 1312 case SIGINT: 1313 Reboot = TRUE; 1314 case SIGTERM: 1315 if (current_state == read_ttys || current_state == multi_user || 1316 current_state == clean_ttys || current_state == catatonia) 1317 requested_transition = death; 1318 else 1319 requested_transition = death_single; 1320 break; 1321 case SIGTSTP: 1322 if (current_state == runcom || current_state == read_ttys || 1323 current_state == clean_ttys || 1324 current_state == multi_user || current_state == catatonia) 1325 requested_transition = catatonia; 1326 break; 1327 default: 1328 requested_transition = 0; 1329 break; 1330 } 1331 } 1332 1333 /* 1334 * Take the system multiuser. 1335 */ 1336 static state_func_t 1337 multi_user(void) 1338 { 1339 pid_t pid; 1340 session_t *sp; 1341 1342 requested_transition = 0; 1343 1344 /* 1345 * If the administrator has not set the security level to -1 1346 * to indicate that the kernel should not run multiuser in secure 1347 * mode, and the run script has not set a higher level of security 1348 * than level 1, then put the kernel into secure mode. 1349 */ 1350 if (getsecuritylevel() == 0) 1351 setsecuritylevel(1); 1352 1353 for (sp = sessions; sp; sp = sp->se_next) { 1354 if (sp->se_process) 1355 continue; 1356 if ((pid = start_getty(sp)) == -1) { 1357 /* serious trouble */ 1358 requested_transition = clean_ttys; 1359 break; 1360 } 1361 sp->se_process = pid; 1362 sp->se_started = time((time_t *) 0); 1363 add_session(sp); 1364 } 1365 1366 while (!requested_transition) 1367 if ((pid = waitpid(-1, (int *) 0, 0)) != -1) 1368 collect_child(pid); 1369 1370 return (state_func_t) requested_transition; 1371 } 1372 1373 /* 1374 * This is an (n*2)+(n^2) algorithm. We hope it isn't run often... 1375 */ 1376 static state_func_t 1377 clean_ttys(void) 1378 { 1379 session_t *sp, *sprev; 1380 struct ttyent *typ; 1381 int session_index = 0; 1382 int devlen; 1383 char *old_getty, *old_window, *old_type; 1384 1385 /* 1386 * mark all sessions for death, (!SE_PRESENT) 1387 * as we find or create new ones they'll be marked as keepers, 1388 * we'll later nuke all the ones not found in /etc/ttys 1389 */ 1390 for (sp = sessions; sp != NULL; sp = sp->se_next) 1391 sp->se_flags &= ~SE_PRESENT; 1392 1393 devlen = sizeof(_PATH_DEV) - 1; 1394 while ((typ = getttyent()) != NULL) { 1395 ++session_index; 1396 1397 for (sprev = 0, sp = sessions; sp; sprev = sp, sp = sp->se_next) 1398 if (strcmp(typ->ty_name, sp->se_device + devlen) == 0) 1399 break; 1400 1401 if (sp) { 1402 /* we want this one to live */ 1403 sp->se_flags |= SE_PRESENT; 1404 if (sp->se_index != session_index) { 1405 warning("port %s changed utmp index from %d to %d", 1406 sp->se_device, sp->se_index, 1407 session_index); 1408 sp->se_index = session_index; 1409 } 1410 if ((typ->ty_status & TTY_ON) == 0 || 1411 typ->ty_getty == 0) { 1412 sp->se_flags |= SE_SHUTDOWN; 1413 kill(sp->se_process, SIGHUP); 1414 continue; 1415 } 1416 sp->se_flags &= ~SE_SHUTDOWN; 1417 old_getty = sp->se_getty ? strdup(sp->se_getty) : 0; 1418 old_window = sp->se_window ? strdup(sp->se_window) : 0; 1419 old_type = sp->se_type ? strdup(sp->se_type) : 0; 1420 if (setupargv(sp, typ) == 0) { 1421 warning("can't parse getty for port %s", 1422 sp->se_device); 1423 sp->se_flags |= SE_SHUTDOWN; 1424 kill(sp->se_process, SIGHUP); 1425 } 1426 else if ( !old_getty 1427 || (!old_type && sp->se_type) 1428 || (old_type && !sp->se_type) 1429 || (!old_window && sp->se_window) 1430 || (old_window && !sp->se_window) 1431 || (strcmp(old_getty, sp->se_getty) != 0) 1432 || (old_window && strcmp(old_window, sp->se_window) != 0) 1433 || (old_type && strcmp(old_type, sp->se_type) != 0) 1434 ) { 1435 /* Don't set SE_SHUTDOWN here */ 1436 sp->se_nspace = 0; 1437 sp->se_started = 0; 1438 kill(sp->se_process, SIGHUP); 1439 } 1440 if (old_getty) 1441 free(old_getty); 1442 if (old_window) 1443 free(old_window); 1444 if (old_type) 1445 free(old_type); 1446 continue; 1447 } 1448 1449 new_session(sprev, session_index, typ); 1450 } 1451 1452 endttyent(); 1453 1454 /* 1455 * sweep through and kill all deleted sessions 1456 * ones who's /etc/ttys line was deleted (SE_PRESENT unset) 1457 */ 1458 for (sp = sessions; sp != NULL; sp = sp->se_next) { 1459 if ((sp->se_flags & SE_PRESENT) == 0) { 1460 sp->se_flags |= SE_SHUTDOWN; 1461 kill(sp->se_process, SIGHUP); 1462 } 1463 } 1464 1465 return (state_func_t) multi_user; 1466 } 1467 1468 /* 1469 * Block further logins. 1470 */ 1471 static state_func_t 1472 catatonia(void) 1473 { 1474 session_t *sp; 1475 1476 for (sp = sessions; sp; sp = sp->se_next) 1477 sp->se_flags |= SE_SHUTDOWN; 1478 1479 return (state_func_t) multi_user; 1480 } 1481 1482 /* 1483 * Note SIGALRM. 1484 */ 1485 static void 1486 alrm_handler(int sig) 1487 { 1488 1489 (void)sig; 1490 clang = 1; 1491 } 1492 1493 /* 1494 * Bring the system down to single user. 1495 */ 1496 static state_func_t 1497 death(void) 1498 { 1499 session_t *sp; 1500 1501 /* 1502 * Also revoke the TTY here. Because runshutdown() may reopen 1503 * the TTY whose getty we're killing here, there is no guarantee 1504 * runshutdown() will perform the initial open() call, causing 1505 * the terminal attributes to be misconfigured. 1506 */ 1507 for (sp = sessions; sp; sp = sp->se_next) { 1508 sp->se_flags |= SE_SHUTDOWN; 1509 kill(sp->se_process, SIGHUP); 1510 revoke(sp->se_device); 1511 } 1512 1513 /* Try to run the rc.shutdown script within a period of time */ 1514 runshutdown(); 1515 1516 return (state_func_t) death_single; 1517 } 1518 1519 /* 1520 * Do what is necessary to reinitialize single user mode or reboot 1521 * from an incomplete state. 1522 */ 1523 static state_func_t 1524 death_single(void) 1525 { 1526 int i; 1527 pid_t pid; 1528 static const int death_sigs[2] = { SIGTERM, SIGKILL }; 1529 1530 revoke(_PATH_CONSOLE); 1531 1532 for (i = 0; i < 2; ++i) { 1533 if (kill(-1, death_sigs[i]) == -1 && errno == ESRCH) 1534 return (state_func_t) single_user; 1535 1536 clang = 0; 1537 alarm(DEATH_WATCH); 1538 do 1539 if ((pid = waitpid(-1, (int *)0, 0)) != -1) 1540 collect_child(pid); 1541 while (clang == 0 && errno != ECHILD); 1542 1543 if (errno == ECHILD) 1544 return (state_func_t) single_user; 1545 } 1546 1547 warning("some processes would not die; ps axl advised"); 1548 1549 return (state_func_t) single_user; 1550 } 1551 1552 /* 1553 * Run the system shutdown script. 1554 * 1555 * Exit codes: XXX I should document more 1556 * -2 shutdown script terminated abnormally 1557 * -1 fatal error - can't run script 1558 * 0 good. 1559 * >0 some error (exit code) 1560 */ 1561 static int 1562 runshutdown(void) 1563 { 1564 pid_t pid, wpid; 1565 int status; 1566 int shutdowntimeout; 1567 size_t len; 1568 char *argv[4]; 1569 const char *shell; 1570 struct sigaction sa; 1571 struct stat sb; 1572 1573 /* 1574 * rc.shutdown is optional, so to prevent any unnecessary 1575 * complaints from the shell we simply don't run it if the 1576 * file does not exist. If the stat() here fails for other 1577 * reasons, we'll let the shell complain. 1578 */ 1579 if (stat(_PATH_RUNDOWN, &sb) == -1 && errno == ENOENT) 1580 return 0; 1581 1582 shell = get_shell(); 1583 1584 if ((pid = fork()) == 0) { 1585 sigemptyset(&sa.sa_mask); 1586 sa.sa_flags = 0; 1587 sa.sa_handler = SIG_IGN; 1588 sigaction(SIGTSTP, &sa, (struct sigaction *)0); 1589 sigaction(SIGHUP, &sa, (struct sigaction *)0); 1590 1591 open_console(); 1592 1593 char _sh[] = "sh"; 1594 char _reboot[] = "reboot"; 1595 char _single[] = "single"; 1596 char _path_rundown[] = _PATH_RUNDOWN; 1597 1598 argv[0] = _sh; 1599 argv[1] = _path_rundown; 1600 argv[2] = Reboot ? _reboot : _single; 1601 argv[3] = 0; 1602 1603 sigprocmask(SIG_SETMASK, &sa.sa_mask, (sigset_t *) 0); 1604 1605 #ifdef LOGIN_CAP 1606 setprocresources(RESOURCE_RC); 1607 #endif 1608 execv(shell, argv); 1609 warning("can't exec %s for %s: %m", shell, _PATH_RUNDOWN); 1610 _exit(1); /* force single user mode */ 1611 } 1612 1613 if (pid == -1) { 1614 emergency("can't fork for %s on %s: %m", shell, _PATH_RUNDOWN); 1615 while (waitpid(-1, (int *) 0, WNOHANG) > 0) 1616 continue; 1617 sleep(STALL_TIMEOUT); 1618 return -1; 1619 } 1620 1621 len = sizeof(shutdowntimeout); 1622 if (sysctlbyname("kern.init_shutdown_timeout", &shutdowntimeout, &len, 1623 NULL, 0) == -1 || shutdowntimeout < 2) 1624 shutdowntimeout = DEATH_SCRIPT; 1625 alarm(shutdowntimeout); 1626 clang = 0; 1627 /* 1628 * Copied from single_user(). This is a bit paranoid. 1629 * Use the same ALRM handler. 1630 */ 1631 do { 1632 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 1633 collect_child(wpid); 1634 if (clang == 1) { 1635 /* we were waiting for the sub-shell */ 1636 kill(wpid, SIGTERM); 1637 warning("timeout expired for %s on %s: %m; going to " 1638 "single user mode", shell, _PATH_RUNDOWN); 1639 return -1; 1640 } 1641 if (wpid == -1) { 1642 if (errno == EINTR) 1643 continue; 1644 warning("wait for %s on %s failed: %m; going to " 1645 "single user mode", shell, _PATH_RUNDOWN); 1646 return -1; 1647 } 1648 if (wpid == pid && WIFSTOPPED(status)) { 1649 warning("init: %s on %s stopped, restarting\n", 1650 shell, _PATH_RUNDOWN); 1651 kill(pid, SIGCONT); 1652 wpid = -1; 1653 } 1654 } while (wpid != pid && !clang); 1655 1656 /* Turn off the alarm */ 1657 alarm(0); 1658 1659 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGTERM && 1660 requested_transition == catatonia) { 1661 /* 1662 * /etc/rc.shutdown executed /sbin/reboot; 1663 * wait for the end quietly 1664 */ 1665 sigset_t s; 1666 1667 sigfillset(&s); 1668 for (;;) 1669 sigsuspend(&s); 1670 } 1671 1672 if (!WIFEXITED(status)) { 1673 warning("%s on %s terminated abnormally, going to " 1674 "single user mode", shell, _PATH_RUNDOWN); 1675 return -2; 1676 } 1677 1678 if ((status = WEXITSTATUS(status)) != 0) 1679 warning("%s returned status %d", _PATH_RUNDOWN, status); 1680 1681 return status; 1682 } 1683 1684 static char * 1685 strk(char *p) 1686 { 1687 static char *t; 1688 char *q; 1689 int c; 1690 1691 if (p) 1692 t = p; 1693 if (!t) 1694 return 0; 1695 1696 c = *t; 1697 while (c == ' ' || c == '\t' ) 1698 c = *++t; 1699 if (!c) { 1700 t = 0; 1701 return 0; 1702 } 1703 q = t; 1704 if (c == '\'') { 1705 c = *++t; 1706 q = t; 1707 while (c && c != '\'') 1708 c = *++t; 1709 if (!c) /* unterminated string */ 1710 q = t = 0; 1711 else 1712 *t++ = 0; 1713 } else { 1714 while (c && c != ' ' && c != '\t' ) 1715 c = *++t; 1716 *t++ = 0; 1717 if (!c) 1718 t = 0; 1719 } 1720 return q; 1721 } 1722 1723 #ifdef LOGIN_CAP 1724 static void 1725 setprocresources(const char *cname) 1726 { 1727 login_cap_t *lc; 1728 if ((lc = login_getclassbyname(cname, NULL)) != NULL) { 1729 setusercontext(lc, (struct passwd*)NULL, 0, 1730 LOGIN_SETPRIORITY | LOGIN_SETRESOURCES); 1731 login_close(lc); 1732 } 1733 } 1734 #endif 1735