init.c revision 232841
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 34static 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 41static char sccsid[] = "@(#)init.c 8.1 (Berkeley) 7/15/93"; 42#endif 43static const char rcsid[] = 44 "$FreeBSD: head/sbin/init/init.c 232841 2012-03-11 22:30:06Z ed $"; 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 98static void handle(sig_t, ...); 99static void delset(sigset_t *, ...); 100 101static void stall(const char *, ...) __printflike(1, 2); 102static void warning(const char *, ...) __printflike(1, 2); 103static void emergency(const char *, ...) __printflike(1, 2); 104static void disaster(int); 105static void badsys(int); 106static int runshutdown(void); 107static 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 */ 114typedef long (*state_func_t)(void); 115typedef state_func_t (*state_t)(void); 116 117static state_func_t single_user(void); 118static state_func_t runcom(void); 119static state_func_t read_ttys(void); 120static state_func_t multi_user(void); 121static state_func_t clean_ttys(void); 122static state_func_t catatonia(void); 123static state_func_t death(void); 124static state_func_t death_single(void); 125 126static state_func_t run_script(const char *); 127 128static enum { AUTOBOOT, FASTBOOT } runcom_mode = AUTOBOOT; 129#define FALSE 0 130#define TRUE 1 131 132static int Reboot = FALSE; 133static int howto = RB_AUTOBOOT; 134 135static int devfs; 136 137static void transition(state_t); 138static state_t requested_transition; 139static state_t current_state = death_single; 140 141static void setctty(const char *); 142static const char *get_shell(void); 143static void write_stderr(const char *message); 144 145typedef 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 165static void free_session(session_t *); 166static session_t *new_session(session_t *, int, struct ttyent *); 167static session_t *sessions; 168 169static char **construct_argv(char *); 170static void start_window_system(session_t *); 171static void collect_child(pid_t); 172static pid_t start_getty(session_t *); 173static void transition_handler(int); 174static void alrm_handler(int); 175static void setsecuritylevel(int); 176static int getsecuritylevel(void); 177static int setupargv(session_t *, struct ttyent *); 178#ifdef LOGIN_CAP 179static void setprocresources(const char *); 180#endif 181static int clang; 182 183static int start_session_db(void); 184static void add_session(session_t *); 185static void del_session(session_t *); 186static session_t *find_session(pid_t); 187static DB *session_db; 188 189/* 190 * The mother of all processes. 191 */ 192int 193main(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 236invalid: 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 */ 391static void 392handle(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 */ 415static void 416delset(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 */ 432static void 433stall(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 */ 448static void 449warning(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 */ 462static void 463emergency(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 */ 478static void 479badsys(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 */ 491static void 492disaster(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 */ 505static int 506getsecuritylevel(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 */ 529static void 530setsecuritylevel(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 */ 557static void 558transition(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 */ 570static void 571setctty(const char *name) 572{ 573 int fd; 574 575 revoke(name); 576 if ((fd = open(name, O_RDWR)) == -1) { 577 stall("can't open %s: %m", name); 578 _exit(1); 579 } 580 if (login_tty(fd) == -1) { 581 stall("can't get %s for controlling terminal: %m", name); 582 _exit(1); 583 } 584} 585 586static const char * 587get_shell(void) 588{ 589 static char kenv_value[PATH_MAX]; 590 591 if (kenv(KENV_GET, "init_shell", kenv_value, sizeof(kenv_value)) > 0) 592 return kenv_value; 593 else 594 return _PATH_BSHELL; 595} 596 597static void 598write_stderr(const char *message) 599{ 600 601 write(STDERR_FILENO, message, strlen(message)); 602} 603 604/* 605 * Bring the system up single user. 606 */ 607static state_func_t 608single_user(void) 609{ 610 pid_t pid, wpid; 611 int status; 612 sigset_t mask; 613 const char *shell; 614 char *argv[2]; 615#ifdef SECURE 616 struct ttyent *typ; 617 struct passwd *pp; 618 static const char banner[] = 619 "Enter root password, or ^D to go multi-user\n"; 620 char *clear, *password; 621#endif 622#ifdef DEBUGSHELL 623 char altshell[128]; 624#endif 625 626 if (Reboot) { 627 /* Instead of going single user, let's reboot the machine */ 628 sync(); 629 alarm(2); 630 pause(); 631 reboot(howto); 632 _exit(0); 633 } 634 635 shell = get_shell(); 636 637 if ((pid = fork()) == 0) { 638 /* 639 * Start the single user session. 640 */ 641 setctty(_PATH_CONSOLE); 642 643#ifdef SECURE 644 /* 645 * Check the root password. 646 * We don't care if the console is 'on' by default; 647 * it's the only tty that can be 'off' and 'secure'. 648 */ 649 typ = getttynam("console"); 650 pp = getpwnam("root"); 651 if (typ && (typ->ty_status & TTY_SECURE) == 0 && 652 pp && *pp->pw_passwd) { 653 write_stderr(banner); 654 for (;;) { 655 clear = getpass("Password:"); 656 if (clear == 0 || *clear == '\0') 657 _exit(0); 658 password = crypt(clear, pp->pw_passwd); 659 bzero(clear, _PASSWORD_LEN); 660 if (password == NULL || 661 strcmp(password, pp->pw_passwd) == 0) 662 break; 663 warning("single-user login failed\n"); 664 } 665 } 666 endttyent(); 667 endpwent(); 668#endif /* SECURE */ 669 670#ifdef DEBUGSHELL 671 { 672 char *cp = altshell; 673 int num; 674 675#define SHREQUEST "Enter full pathname of shell or RETURN for " 676 write_stderr(SHREQUEST); 677 write_stderr(shell); 678 write_stderr(": "); 679 while ((num = read(STDIN_FILENO, cp, 1)) != -1 && 680 num != 0 && *cp != '\n' && cp < &altshell[127]) 681 cp++; 682 *cp = '\0'; 683 if (altshell[0] != '\0') 684 shell = altshell; 685 } 686#endif /* DEBUGSHELL */ 687 688 /* 689 * Unblock signals. 690 * We catch all the interesting ones, 691 * and those are reset to SIG_DFL on exec. 692 */ 693 sigemptyset(&mask); 694 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0); 695 696 /* 697 * Fire off a shell. 698 * If the default one doesn't work, try the Bourne shell. 699 */ 700 701 char name[] = "-sh"; 702 703 argv[0] = name; 704 argv[1] = 0; 705 execv(shell, argv); 706 emergency("can't exec %s for single user: %m", shell); 707 execv(_PATH_BSHELL, argv); 708 emergency("can't exec %s for single user: %m", _PATH_BSHELL); 709 sleep(STALL_TIMEOUT); 710 _exit(1); 711 } 712 713 if (pid == -1) { 714 /* 715 * We are seriously hosed. Do our best. 716 */ 717 emergency("can't fork single-user shell, trying again"); 718 while (waitpid(-1, (int *) 0, WNOHANG) > 0) 719 continue; 720 return (state_func_t) single_user; 721 } 722 723 requested_transition = 0; 724 do { 725 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 726 collect_child(wpid); 727 if (wpid == -1) { 728 if (errno == EINTR) 729 continue; 730 warning("wait for single-user shell failed: %m; restarting"); 731 return (state_func_t) single_user; 732 } 733 if (wpid == pid && WIFSTOPPED(status)) { 734 warning("init: shell stopped, restarting\n"); 735 kill(pid, SIGCONT); 736 wpid = -1; 737 } 738 } while (wpid != pid && !requested_transition); 739 740 if (requested_transition) 741 return (state_func_t) requested_transition; 742 743 if (!WIFEXITED(status)) { 744 if (WTERMSIG(status) == SIGKILL) { 745 /* 746 * reboot(8) killed shell? 747 */ 748 warning("single user shell terminated."); 749 sleep(STALL_TIMEOUT); 750 _exit(0); 751 } else { 752 warning("single user shell terminated, restarting"); 753 return (state_func_t) single_user; 754 } 755 } 756 757 runcom_mode = FASTBOOT; 758 return (state_func_t) runcom; 759} 760 761/* 762 * Run the system startup script. 763 */ 764static state_func_t 765runcom(void) 766{ 767 state_func_t next_transition; 768 769 if ((next_transition = run_script(_PATH_RUNCOM)) != 0) 770 return next_transition; 771 772 runcom_mode = AUTOBOOT; /* the default */ 773 return (state_func_t) read_ttys; 774} 775 776/* 777 * Run a shell script. 778 * Returns 0 on success, otherwise the next transition to enter: 779 * - single_user if fork/execv/waitpid failed, or if the script 780 * terminated with a signal or exit code != 0. 781 * - death_single if a SIGTERM was delivered to init(8). 782 */ 783static state_func_t 784run_script(const char *script) 785{ 786 pid_t pid, wpid; 787 int status; 788 char *argv[4]; 789 const char *shell; 790 struct sigaction sa; 791 792 shell = get_shell(); 793 794 if ((pid = fork()) == 0) { 795 sigemptyset(&sa.sa_mask); 796 sa.sa_flags = 0; 797 sa.sa_handler = SIG_IGN; 798 sigaction(SIGTSTP, &sa, (struct sigaction *)0); 799 sigaction(SIGHUP, &sa, (struct sigaction *)0); 800 801 setctty(_PATH_CONSOLE); 802 803 char _sh[] = "sh"; 804 char _autoboot[] = "autoboot"; 805 806 argv[0] = _sh; 807 argv[1] = __DECONST(char *, script); 808 argv[2] = runcom_mode == AUTOBOOT ? _autoboot : 0; 809 argv[3] = 0; 810 811 sigprocmask(SIG_SETMASK, &sa.sa_mask, (sigset_t *) 0); 812 813#ifdef LOGIN_CAP 814 setprocresources(RESOURCE_RC); 815#endif 816 execv(shell, argv); 817 stall("can't exec %s for %s: %m", shell, script); 818 _exit(1); /* force single user mode */ 819 } 820 821 if (pid == -1) { 822 emergency("can't fork for %s on %s: %m", shell, script); 823 while (waitpid(-1, (int *) 0, WNOHANG) > 0) 824 continue; 825 sleep(STALL_TIMEOUT); 826 return (state_func_t) single_user; 827 } 828 829 /* 830 * Copied from single_user(). This is a bit paranoid. 831 */ 832 requested_transition = 0; 833 do { 834 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 835 collect_child(wpid); 836 if (wpid == -1) { 837 if (requested_transition == death_single) 838 return (state_func_t) death_single; 839 if (errno == EINTR) 840 continue; 841 warning("wait for %s on %s failed: %m; going to " 842 "single user mode", shell, script); 843 return (state_func_t) single_user; 844 } 845 if (wpid == pid && WIFSTOPPED(status)) { 846 warning("init: %s on %s stopped, restarting\n", 847 shell, script); 848 kill(pid, SIGCONT); 849 wpid = -1; 850 } 851 } while (wpid != pid); 852 853 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGTERM && 854 requested_transition == catatonia) { 855 /* /etc/rc executed /sbin/reboot; wait for the end quietly */ 856 sigset_t s; 857 858 sigfillset(&s); 859 for (;;) 860 sigsuspend(&s); 861 } 862 863 if (!WIFEXITED(status)) { 864 warning("%s on %s terminated abnormally, going to single " 865 "user mode", shell, script); 866 return (state_func_t) single_user; 867 } 868 869 if (WEXITSTATUS(status)) 870 return (state_func_t) single_user; 871 872 return (state_func_t) 0; 873} 874 875/* 876 * Open the session database. 877 * 878 * NB: We could pass in the size here; is it necessary? 879 */ 880static int 881start_session_db(void) 882{ 883 if (session_db && (*session_db->close)(session_db)) 884 emergency("session database close: %s", strerror(errno)); 885 if ((session_db = dbopen(NULL, O_RDWR, 0, DB_HASH, NULL)) == 0) { 886 emergency("session database open: %s", strerror(errno)); 887 return (1); 888 } 889 return (0); 890 891} 892 893/* 894 * Add a new login session. 895 */ 896static void 897add_session(session_t *sp) 898{ 899 DBT key; 900 DBT data; 901 902 key.data = &sp->se_process; 903 key.size = sizeof sp->se_process; 904 data.data = &sp; 905 data.size = sizeof sp; 906 907 if ((*session_db->put)(session_db, &key, &data, 0)) 908 emergency("insert %d: %s", sp->se_process, strerror(errno)); 909} 910 911/* 912 * Delete an old login session. 913 */ 914static void 915del_session(session_t *sp) 916{ 917 DBT key; 918 919 key.data = &sp->se_process; 920 key.size = sizeof sp->se_process; 921 922 if ((*session_db->del)(session_db, &key, 0)) 923 emergency("delete %d: %s", sp->se_process, strerror(errno)); 924} 925 926/* 927 * Look up a login session by pid. 928 */ 929static session_t * 930find_session(pid_t pid) 931{ 932 DBT key; 933 DBT data; 934 session_t *ret; 935 936 key.data = &pid; 937 key.size = sizeof pid; 938 if ((*session_db->get)(session_db, &key, &data, 0) != 0) 939 return 0; 940 bcopy(data.data, (char *)&ret, sizeof(ret)); 941 return ret; 942} 943 944/* 945 * Construct an argument vector from a command line. 946 */ 947static char ** 948construct_argv(char *command) 949{ 950 int argc = 0; 951 char **argv = (char **) malloc(((strlen(command) + 1) / 2 + 1) 952 * sizeof (char *)); 953 954 if ((argv[argc++] = strk(command)) == 0) { 955 free(argv); 956 return (NULL); 957 } 958 while ((argv[argc++] = strk((char *) 0)) != NULL) 959 continue; 960 return argv; 961} 962 963/* 964 * Deallocate a session descriptor. 965 */ 966static void 967free_session(session_t *sp) 968{ 969 free(sp->se_device); 970 if (sp->se_getty) { 971 free(sp->se_getty); 972 free(sp->se_getty_argv_space); 973 free(sp->se_getty_argv); 974 } 975 if (sp->se_window) { 976 free(sp->se_window); 977 free(sp->se_window_argv_space); 978 free(sp->se_window_argv); 979 } 980 if (sp->se_type) 981 free(sp->se_type); 982 free(sp); 983} 984 985/* 986 * Allocate a new session descriptor. 987 * Mark it SE_PRESENT. 988 */ 989static session_t * 990new_session(session_t *sprev, int session_index, struct ttyent *typ) 991{ 992 session_t *sp; 993 int fd; 994 995 if ((typ->ty_status & TTY_ON) == 0 || 996 typ->ty_name == 0 || 997 typ->ty_getty == 0) 998 return 0; 999 1000 sp = (session_t *) calloc(1, sizeof (session_t)); 1001 1002 sp->se_index = session_index; 1003 sp->se_flags |= SE_PRESENT; 1004 1005 sp->se_device = malloc(sizeof(_PATH_DEV) + strlen(typ->ty_name)); 1006 sprintf(sp->se_device, "%s%s", _PATH_DEV, typ->ty_name); 1007 1008 /* 1009 * Attempt to open the device, if we get "device not configured" 1010 * then don't add the device to the session list. 1011 */ 1012 if ((fd = open(sp->se_device, O_RDONLY | O_NONBLOCK, 0)) < 0) { 1013 if (errno == ENXIO) { 1014 free_session(sp); 1015 return (0); 1016 } 1017 } else 1018 close(fd); 1019 1020 if (setupargv(sp, typ) == 0) { 1021 free_session(sp); 1022 return (0); 1023 } 1024 1025 sp->se_next = 0; 1026 if (sprev == 0) { 1027 sessions = sp; 1028 sp->se_prev = 0; 1029 } else { 1030 sprev->se_next = sp; 1031 sp->se_prev = sprev; 1032 } 1033 1034 return sp; 1035} 1036 1037/* 1038 * Calculate getty and if useful window argv vectors. 1039 */ 1040static int 1041setupargv(session_t *sp, struct ttyent *typ) 1042{ 1043 1044 if (sp->se_getty) { 1045 free(sp->se_getty); 1046 free(sp->se_getty_argv_space); 1047 free(sp->se_getty_argv); 1048 } 1049 sp->se_getty = malloc(strlen(typ->ty_getty) + strlen(typ->ty_name) + 2); 1050 sprintf(sp->se_getty, "%s %s", typ->ty_getty, typ->ty_name); 1051 sp->se_getty_argv_space = strdup(sp->se_getty); 1052 sp->se_getty_argv = construct_argv(sp->se_getty_argv_space); 1053 if (sp->se_getty_argv == 0) { 1054 warning("can't parse getty for port %s", sp->se_device); 1055 free(sp->se_getty); 1056 free(sp->se_getty_argv_space); 1057 sp->se_getty = sp->se_getty_argv_space = 0; 1058 return (0); 1059 } 1060 if (sp->se_window) { 1061 free(sp->se_window); 1062 free(sp->se_window_argv_space); 1063 free(sp->se_window_argv); 1064 } 1065 sp->se_window = sp->se_window_argv_space = 0; 1066 sp->se_window_argv = 0; 1067 if (typ->ty_window) { 1068 sp->se_window = strdup(typ->ty_window); 1069 sp->se_window_argv_space = strdup(sp->se_window); 1070 sp->se_window_argv = construct_argv(sp->se_window_argv_space); 1071 if (sp->se_window_argv == 0) { 1072 warning("can't parse window for port %s", 1073 sp->se_device); 1074 free(sp->se_window_argv_space); 1075 free(sp->se_window); 1076 sp->se_window = sp->se_window_argv_space = 0; 1077 return (0); 1078 } 1079 } 1080 if (sp->se_type) 1081 free(sp->se_type); 1082 sp->se_type = typ->ty_type ? strdup(typ->ty_type) : 0; 1083 return (1); 1084} 1085 1086/* 1087 * Walk the list of ttys and create sessions for each active line. 1088 */ 1089static state_func_t 1090read_ttys(void) 1091{ 1092 int session_index = 0; 1093 session_t *sp, *snext; 1094 struct ttyent *typ; 1095 1096 /* 1097 * Destroy any previous session state. 1098 * There shouldn't be any, but just in case... 1099 */ 1100 for (sp = sessions; sp; sp = snext) { 1101 snext = sp->se_next; 1102 free_session(sp); 1103 } 1104 sessions = 0; 1105 if (start_session_db()) 1106 return (state_func_t) single_user; 1107 1108 /* 1109 * Allocate a session entry for each active port. 1110 * Note that sp starts at 0. 1111 */ 1112 while ((typ = getttyent()) != NULL) 1113 if ((snext = new_session(sp, ++session_index, typ)) != NULL) 1114 sp = snext; 1115 1116 endttyent(); 1117 1118 return (state_func_t) multi_user; 1119} 1120 1121/* 1122 * Start a window system running. 1123 */ 1124static void 1125start_window_system(session_t *sp) 1126{ 1127 pid_t pid; 1128 sigset_t mask; 1129 char term[64], *env[2]; 1130 int status; 1131 1132 if ((pid = fork()) == -1) { 1133 emergency("can't fork for window system on port %s: %m", 1134 sp->se_device); 1135 /* hope that getty fails and we can try again */ 1136 return; 1137 } 1138 if (pid) { 1139 waitpid(-1, &status, 0); 1140 return; 1141 } 1142 1143 /* reparent window process to the init to not make a zombie on exit */ 1144 if ((pid = fork()) == -1) { 1145 emergency("can't fork for window system on port %s: %m", 1146 sp->se_device); 1147 _exit(1); 1148 } 1149 if (pid) 1150 _exit(0); 1151 1152 sigemptyset(&mask); 1153 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0); 1154 1155 if (setsid() < 0) 1156 emergency("setsid failed (window) %m"); 1157 1158#ifdef LOGIN_CAP 1159 setprocresources(RESOURCE_WINDOW); 1160#endif 1161 if (sp->se_type) { 1162 /* Don't use malloc after fork */ 1163 strcpy(term, "TERM="); 1164 strncat(term, sp->se_type, sizeof(term) - 6); 1165 env[0] = term; 1166 env[1] = 0; 1167 } 1168 else 1169 env[0] = 0; 1170 execve(sp->se_window_argv[0], sp->se_window_argv, env); 1171 stall("can't exec window system '%s' for port %s: %m", 1172 sp->se_window_argv[0], sp->se_device); 1173 _exit(1); 1174} 1175 1176/* 1177 * Start a login session running. 1178 */ 1179static pid_t 1180start_getty(session_t *sp) 1181{ 1182 pid_t pid; 1183 sigset_t mask; 1184 time_t current_time = time((time_t *) 0); 1185 int too_quick = 0; 1186 char term[64], *env[2]; 1187 1188 if (current_time >= sp->se_started && 1189 current_time - sp->se_started < GETTY_SPACING) { 1190 if (++sp->se_nspace > GETTY_NSPACE) { 1191 sp->se_nspace = 0; 1192 too_quick = 1; 1193 } 1194 } else 1195 sp->se_nspace = 0; 1196 1197 /* 1198 * fork(), not vfork() -- we can't afford to block. 1199 */ 1200 if ((pid = fork()) == -1) { 1201 emergency("can't fork for getty on port %s: %m", sp->se_device); 1202 return -1; 1203 } 1204 1205 if (pid) 1206 return pid; 1207 1208 if (too_quick) { 1209 warning("getty repeating too quickly on port %s, sleeping %d secs", 1210 sp->se_device, GETTY_SLEEP); 1211 sleep((unsigned) GETTY_SLEEP); 1212 } 1213 1214 if (sp->se_window) { 1215 start_window_system(sp); 1216 sleep(WINDOW_WAIT); 1217 } 1218 1219 sigemptyset(&mask); 1220 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0); 1221 1222#ifdef LOGIN_CAP 1223 setprocresources(RESOURCE_GETTY); 1224#endif 1225 if (sp->se_type) { 1226 /* Don't use malloc after fork */ 1227 strcpy(term, "TERM="); 1228 strncat(term, sp->se_type, sizeof(term) - 6); 1229 env[0] = term; 1230 env[1] = 0; 1231 } else 1232 env[0] = 0; 1233 execve(sp->se_getty_argv[0], sp->se_getty_argv, env); 1234 stall("can't exec getty '%s' for port %s: %m", 1235 sp->se_getty_argv[0], sp->se_device); 1236 _exit(1); 1237} 1238 1239/* 1240 * Collect exit status for a child. 1241 * If an exiting login, start a new login running. 1242 */ 1243static void 1244collect_child(pid_t pid) 1245{ 1246 session_t *sp, *sprev, *snext; 1247 1248 if (! sessions) 1249 return; 1250 1251 if (! (sp = find_session(pid))) 1252 return; 1253 1254 del_session(sp); 1255 sp->se_process = 0; 1256 1257 if (sp->se_flags & SE_SHUTDOWN) { 1258 if ((sprev = sp->se_prev) != NULL) 1259 sprev->se_next = sp->se_next; 1260 else 1261 sessions = sp->se_next; 1262 if ((snext = sp->se_next) != NULL) 1263 snext->se_prev = sp->se_prev; 1264 free_session(sp); 1265 return; 1266 } 1267 1268 if ((pid = start_getty(sp)) == -1) { 1269 /* serious trouble */ 1270 requested_transition = clean_ttys; 1271 return; 1272 } 1273 1274 sp->se_process = pid; 1275 sp->se_started = time((time_t *) 0); 1276 add_session(sp); 1277} 1278 1279/* 1280 * Catch a signal and request a state transition. 1281 */ 1282static void 1283transition_handler(int sig) 1284{ 1285 1286 switch (sig) { 1287 case SIGHUP: 1288 if (current_state == read_ttys || current_state == multi_user || 1289 current_state == clean_ttys || current_state == catatonia) 1290 requested_transition = clean_ttys; 1291 break; 1292 case SIGUSR2: 1293 howto = RB_POWEROFF; 1294 case SIGUSR1: 1295 howto |= RB_HALT; 1296 case SIGINT: 1297 Reboot = TRUE; 1298 case SIGTERM: 1299 if (current_state == read_ttys || current_state == multi_user || 1300 current_state == clean_ttys || current_state == catatonia) 1301 requested_transition = death; 1302 else 1303 requested_transition = death_single; 1304 break; 1305 case SIGTSTP: 1306 if (current_state == runcom || current_state == read_ttys || 1307 current_state == clean_ttys || 1308 current_state == multi_user || current_state == catatonia) 1309 requested_transition = catatonia; 1310 break; 1311 default: 1312 requested_transition = 0; 1313 break; 1314 } 1315} 1316 1317/* 1318 * Take the system multiuser. 1319 */ 1320static state_func_t 1321multi_user(void) 1322{ 1323 pid_t pid; 1324 session_t *sp; 1325 1326 requested_transition = 0; 1327 1328 /* 1329 * If the administrator has not set the security level to -1 1330 * to indicate that the kernel should not run multiuser in secure 1331 * mode, and the run script has not set a higher level of security 1332 * than level 1, then put the kernel into secure mode. 1333 */ 1334 if (getsecuritylevel() == 0) 1335 setsecuritylevel(1); 1336 1337 for (sp = sessions; sp; sp = sp->se_next) { 1338 if (sp->se_process) 1339 continue; 1340 if ((pid = start_getty(sp)) == -1) { 1341 /* serious trouble */ 1342 requested_transition = clean_ttys; 1343 break; 1344 } 1345 sp->se_process = pid; 1346 sp->se_started = time((time_t *) 0); 1347 add_session(sp); 1348 } 1349 1350 while (!requested_transition) 1351 if ((pid = waitpid(-1, (int *) 0, 0)) != -1) 1352 collect_child(pid); 1353 1354 return (state_func_t) requested_transition; 1355} 1356 1357/* 1358 * This is an (n*2)+(n^2) algorithm. We hope it isn't run often... 1359 */ 1360static state_func_t 1361clean_ttys(void) 1362{ 1363 session_t *sp, *sprev; 1364 struct ttyent *typ; 1365 int session_index = 0; 1366 int devlen; 1367 char *old_getty, *old_window, *old_type; 1368 1369 /* 1370 * mark all sessions for death, (!SE_PRESENT) 1371 * as we find or create new ones they'll be marked as keepers, 1372 * we'll later nuke all the ones not found in /etc/ttys 1373 */ 1374 for (sp = sessions; sp != NULL; sp = sp->se_next) 1375 sp->se_flags &= ~SE_PRESENT; 1376 1377 devlen = sizeof(_PATH_DEV) - 1; 1378 while ((typ = getttyent()) != NULL) { 1379 ++session_index; 1380 1381 for (sprev = 0, sp = sessions; sp; sprev = sp, sp = sp->se_next) 1382 if (strcmp(typ->ty_name, sp->se_device + devlen) == 0) 1383 break; 1384 1385 if (sp) { 1386 /* we want this one to live */ 1387 sp->se_flags |= SE_PRESENT; 1388 if (sp->se_index != session_index) { 1389 warning("port %s changed utmp index from %d to %d", 1390 sp->se_device, sp->se_index, 1391 session_index); 1392 sp->se_index = session_index; 1393 } 1394 if ((typ->ty_status & TTY_ON) == 0 || 1395 typ->ty_getty == 0) { 1396 sp->se_flags |= SE_SHUTDOWN; 1397 kill(sp->se_process, SIGHUP); 1398 continue; 1399 } 1400 sp->se_flags &= ~SE_SHUTDOWN; 1401 old_getty = sp->se_getty ? strdup(sp->se_getty) : 0; 1402 old_window = sp->se_window ? strdup(sp->se_window) : 0; 1403 old_type = sp->se_type ? strdup(sp->se_type) : 0; 1404 if (setupargv(sp, typ) == 0) { 1405 warning("can't parse getty for port %s", 1406 sp->se_device); 1407 sp->se_flags |= SE_SHUTDOWN; 1408 kill(sp->se_process, SIGHUP); 1409 } 1410 else if ( !old_getty 1411 || (!old_type && sp->se_type) 1412 || (old_type && !sp->se_type) 1413 || (!old_window && sp->se_window) 1414 || (old_window && !sp->se_window) 1415 || (strcmp(old_getty, sp->se_getty) != 0) 1416 || (old_window && strcmp(old_window, sp->se_window) != 0) 1417 || (old_type && strcmp(old_type, sp->se_type) != 0) 1418 ) { 1419 /* Don't set SE_SHUTDOWN here */ 1420 sp->se_nspace = 0; 1421 sp->se_started = 0; 1422 kill(sp->se_process, SIGHUP); 1423 } 1424 if (old_getty) 1425 free(old_getty); 1426 if (old_window) 1427 free(old_window); 1428 if (old_type) 1429 free(old_type); 1430 continue; 1431 } 1432 1433 new_session(sprev, session_index, typ); 1434 } 1435 1436 endttyent(); 1437 1438 /* 1439 * sweep through and kill all deleted sessions 1440 * ones who's /etc/ttys line was deleted (SE_PRESENT unset) 1441 */ 1442 for (sp = sessions; sp != NULL; sp = sp->se_next) { 1443 if ((sp->se_flags & SE_PRESENT) == 0) { 1444 sp->se_flags |= SE_SHUTDOWN; 1445 kill(sp->se_process, SIGHUP); 1446 } 1447 } 1448 1449 return (state_func_t) multi_user; 1450} 1451 1452/* 1453 * Block further logins. 1454 */ 1455static state_func_t 1456catatonia(void) 1457{ 1458 session_t *sp; 1459 1460 for (sp = sessions; sp; sp = sp->se_next) 1461 sp->se_flags |= SE_SHUTDOWN; 1462 1463 return (state_func_t) multi_user; 1464} 1465 1466/* 1467 * Note SIGALRM. 1468 */ 1469static void 1470alrm_handler(int sig) 1471{ 1472 1473 (void)sig; 1474 clang = 1; 1475} 1476 1477/* 1478 * Bring the system down to single user. 1479 */ 1480static state_func_t 1481death(void) 1482{ 1483 session_t *sp; 1484 1485 /* 1486 * Also revoke the TTY here. Because runshutdown() may reopen 1487 * the TTY whose getty we're killing here, there is no guarantee 1488 * runshutdown() will perform the initial open() call, causing 1489 * the terminal attributes to be misconfigured. 1490 */ 1491 for (sp = sessions; sp; sp = sp->se_next) { 1492 sp->se_flags |= SE_SHUTDOWN; 1493 kill(sp->se_process, SIGHUP); 1494 revoke(sp->se_device); 1495 } 1496 1497 /* Try to run the rc.shutdown script within a period of time */ 1498 runshutdown(); 1499 1500 return (state_func_t) death_single; 1501} 1502 1503/* 1504 * Do what is necessary to reinitialize single user mode or reboot 1505 * from an incomplete state. 1506 */ 1507static state_func_t 1508death_single(void) 1509{ 1510 int i; 1511 pid_t pid; 1512 static const int death_sigs[2] = { SIGTERM, SIGKILL }; 1513 1514 revoke(_PATH_CONSOLE); 1515 1516 for (i = 0; i < 2; ++i) { 1517 if (kill(-1, death_sigs[i]) == -1 && errno == ESRCH) 1518 return (state_func_t) single_user; 1519 1520 clang = 0; 1521 alarm(DEATH_WATCH); 1522 do 1523 if ((pid = waitpid(-1, (int *)0, 0)) != -1) 1524 collect_child(pid); 1525 while (clang == 0 && errno != ECHILD); 1526 1527 if (errno == ECHILD) 1528 return (state_func_t) single_user; 1529 } 1530 1531 warning("some processes would not die; ps axl advised"); 1532 1533 return (state_func_t) single_user; 1534} 1535 1536/* 1537 * Run the system shutdown script. 1538 * 1539 * Exit codes: XXX I should document more 1540 * -2 shutdown script terminated abnormally 1541 * -1 fatal error - can't run script 1542 * 0 good. 1543 * >0 some error (exit code) 1544 */ 1545static int 1546runshutdown(void) 1547{ 1548 pid_t pid, wpid; 1549 int status; 1550 int shutdowntimeout; 1551 size_t len; 1552 char *argv[4]; 1553 const char *shell; 1554 struct sigaction sa; 1555 struct stat sb; 1556 1557 /* 1558 * rc.shutdown is optional, so to prevent any unnecessary 1559 * complaints from the shell we simply don't run it if the 1560 * file does not exist. If the stat() here fails for other 1561 * reasons, we'll let the shell complain. 1562 */ 1563 if (stat(_PATH_RUNDOWN, &sb) == -1 && errno == ENOENT) 1564 return 0; 1565 1566 shell = get_shell(); 1567 1568 if ((pid = fork()) == 0) { 1569 sigemptyset(&sa.sa_mask); 1570 sa.sa_flags = 0; 1571 sa.sa_handler = SIG_IGN; 1572 sigaction(SIGTSTP, &sa, (struct sigaction *)0); 1573 sigaction(SIGHUP, &sa, (struct sigaction *)0); 1574 1575 setctty(_PATH_CONSOLE); 1576 1577 char _sh[] = "sh"; 1578 char _reboot[] = "reboot"; 1579 char _single[] = "single"; 1580 char _path_rundown[] = _PATH_RUNDOWN; 1581 1582 argv[0] = _sh; 1583 argv[1] = _path_rundown; 1584 argv[2] = Reboot ? _reboot : _single; 1585 argv[3] = 0; 1586 1587 sigprocmask(SIG_SETMASK, &sa.sa_mask, (sigset_t *) 0); 1588 1589#ifdef LOGIN_CAP 1590 setprocresources(RESOURCE_RC); 1591#endif 1592 execv(shell, argv); 1593 warning("can't exec %s for %s: %m", shell, _PATH_RUNDOWN); 1594 _exit(1); /* force single user mode */ 1595 } 1596 1597 if (pid == -1) { 1598 emergency("can't fork for %s on %s: %m", shell, _PATH_RUNDOWN); 1599 while (waitpid(-1, (int *) 0, WNOHANG) > 0) 1600 continue; 1601 sleep(STALL_TIMEOUT); 1602 return -1; 1603 } 1604 1605 len = sizeof(shutdowntimeout); 1606 if (sysctlbyname("kern.init_shutdown_timeout", &shutdowntimeout, &len, 1607 NULL, 0) == -1 || shutdowntimeout < 2) 1608 shutdowntimeout = DEATH_SCRIPT; 1609 alarm(shutdowntimeout); 1610 clang = 0; 1611 /* 1612 * Copied from single_user(). This is a bit paranoid. 1613 * Use the same ALRM handler. 1614 */ 1615 do { 1616 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 1617 collect_child(wpid); 1618 if (clang == 1) { 1619 /* we were waiting for the sub-shell */ 1620 kill(wpid, SIGTERM); 1621 warning("timeout expired for %s on %s: %m; going to " 1622 "single user mode", shell, _PATH_RUNDOWN); 1623 return -1; 1624 } 1625 if (wpid == -1) { 1626 if (errno == EINTR) 1627 continue; 1628 warning("wait for %s on %s failed: %m; going to " 1629 "single user mode", shell, _PATH_RUNDOWN); 1630 return -1; 1631 } 1632 if (wpid == pid && WIFSTOPPED(status)) { 1633 warning("init: %s on %s stopped, restarting\n", 1634 shell, _PATH_RUNDOWN); 1635 kill(pid, SIGCONT); 1636 wpid = -1; 1637 } 1638 } while (wpid != pid && !clang); 1639 1640 /* Turn off the alarm */ 1641 alarm(0); 1642 1643 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGTERM && 1644 requested_transition == catatonia) { 1645 /* 1646 * /etc/rc.shutdown executed /sbin/reboot; 1647 * wait for the end quietly 1648 */ 1649 sigset_t s; 1650 1651 sigfillset(&s); 1652 for (;;) 1653 sigsuspend(&s); 1654 } 1655 1656 if (!WIFEXITED(status)) { 1657 warning("%s on %s terminated abnormally, going to " 1658 "single user mode", shell, _PATH_RUNDOWN); 1659 return -2; 1660 } 1661 1662 if ((status = WEXITSTATUS(status)) != 0) 1663 warning("%s returned status %d", _PATH_RUNDOWN, status); 1664 1665 return status; 1666} 1667 1668static char * 1669strk(char *p) 1670{ 1671 static char *t; 1672 char *q; 1673 int c; 1674 1675 if (p) 1676 t = p; 1677 if (!t) 1678 return 0; 1679 1680 c = *t; 1681 while (c == ' ' || c == '\t' ) 1682 c = *++t; 1683 if (!c) { 1684 t = 0; 1685 return 0; 1686 } 1687 q = t; 1688 if (c == '\'') { 1689 c = *++t; 1690 q = t; 1691 while (c && c != '\'') 1692 c = *++t; 1693 if (!c) /* unterminated string */ 1694 q = t = 0; 1695 else 1696 *t++ = 0; 1697 } else { 1698 while (c && c != ' ' && c != '\t' ) 1699 c = *++t; 1700 *t++ = 0; 1701 if (!c) 1702 t = 0; 1703 } 1704 return q; 1705} 1706 1707#ifdef LOGIN_CAP 1708static void 1709setprocresources(const char *cname) 1710{ 1711 login_cap_t *lc; 1712 if ((lc = login_getclassbyname(cname, NULL)) != NULL) { 1713 setusercontext(lc, (struct passwd*)NULL, 0, 1714 LOGIN_SETPRIORITY | LOGIN_SETRESOURCES); 1715 login_close(lc); 1716 } 1717} 1718#endif 1719