init.c revision 173787
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 173787 2007-11-20 21:25:58Z obrien $"; 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 98void handle(sig_t, ...); 99void delset(sigset_t *, ...); 100 101void stall(const char *, ...) __printflike(1, 2); 102void warning(const char *, ...) __printflike(1, 2); 103void emergency(const char *, ...) __printflike(1, 2); 104void disaster(int); 105void badsys(int); 106int 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 117state_func_t single_user(void); 118state_func_t runcom(void); 119state_func_t read_ttys(void); 120state_func_t multi_user(void); 121state_func_t clean_ttys(void); 122state_func_t catatonia(void); 123state_func_t death(void); 124 125state_func_t run_script(const char *); 126 127enum { AUTOBOOT, FASTBOOT } runcom_mode = AUTOBOOT; 128#define FALSE 0 129#define TRUE 1 130 131int Reboot = FALSE; 132int howto = RB_AUTOBOOT; 133 134int devfs; 135 136void transition(state_t); 137state_t requested_transition; 138 139void setctty(const char *); 140const char *get_shell(void); 141void write_stderr(const char *message); 142 143typedef struct init_session { 144 int se_index; /* index of entry in ttys file */ 145 pid_t se_process; /* controlling process */ 146 time_t se_started; /* used to avoid thrashing */ 147 int se_flags; /* status of session */ 148#define SE_SHUTDOWN 0x1 /* session won't be restarted */ 149#define SE_PRESENT 0x2 /* session is in /etc/ttys */ 150 int se_nspace; /* spacing count */ 151 char *se_device; /* filename of port */ 152 char *se_getty; /* what to run on that port */ 153 char *se_getty_argv_space; /* pre-parsed argument array space */ 154 char **se_getty_argv; /* pre-parsed argument array */ 155 char *se_window; /* window system (started only once) */ 156 char *se_window_argv_space; /* pre-parsed argument array space */ 157 char **se_window_argv; /* pre-parsed argument array */ 158 char *se_type; /* default terminal type */ 159 struct init_session *se_prev; 160 struct init_session *se_next; 161} session_t; 162 163void free_session(session_t *); 164session_t *new_session(session_t *, int, struct ttyent *); 165session_t *sessions; 166 167char **construct_argv(char *); 168void start_window_system(session_t *); 169void collect_child(pid_t); 170pid_t start_getty(session_t *); 171void transition_handler(int); 172void alrm_handler(int); 173void setsecuritylevel(int); 174int getsecuritylevel(void); 175int setupargv(session_t *, struct ttyent *); 176#ifdef LOGIN_CAP 177void setprocresources(const char *); 178#endif 179int clang; 180 181void clear_session_logs(session_t *); 182 183int start_session_db(void); 184void add_session(session_t *); 185void del_session(session_t *); 186session_t *find_session(pid_t); 187DB *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 */ 391void 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 */ 415void 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 */ 432void 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 */ 448void 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 */ 462void 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 */ 478void 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 */ 491void 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 */ 505int 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 */ 529void 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 */ 557void 558transition(state_t s) 559{ 560 561 for (;;) 562 s = (state_t) (*s)(); 563} 564 565/* 566 * Close out the accounting files for a login session. 567 * NB: should send a message to the session logger to avoid blocking. 568 */ 569void 570clear_session_logs(session_t *sp) 571{ 572 char *line = sp->se_device + sizeof(_PATH_DEV) - 1; 573 574 if (logout(line)) 575 logwtmp(line, "", ""); 576} 577 578/* 579 * Start a session and allocate a controlling terminal. 580 * Only called by children of init after forking. 581 */ 582void 583setctty(const char *name) 584{ 585 int fd; 586 587 revoke(name); 588 if ((fd = open(name, O_RDWR)) == -1) { 589 stall("can't open %s: %m", name); 590 _exit(1); 591 } 592 if (login_tty(fd) == -1) { 593 stall("can't get %s for controlling terminal: %m", name); 594 _exit(1); 595 } 596} 597 598const char * 599get_shell(void) 600{ 601 static char kenv_value[PATH_MAX]; 602 603 if (kenv(KENV_GET, "init_shell", kenv_value, sizeof(kenv_value)) > 0) 604 return kenv_value; 605 else 606 return _PATH_BSHELL; 607} 608 609void 610write_stderr(const char *message) 611{ 612 613 write(STDERR_FILENO, message, strlen(message)); 614} 615 616/* 617 * Bring the system up single user. 618 */ 619state_func_t 620single_user(void) 621{ 622 pid_t pid, wpid; 623 int status; 624 sigset_t mask; 625 const char *shell; 626 char *argv[2]; 627#ifdef SECURE 628 struct ttyent *typ; 629 struct passwd *pp; 630 static const char banner[] = 631 "Enter root password, or ^D to go multi-user\n"; 632 char *clear, *password; 633#endif 634#ifdef DEBUGSHELL 635 char altshell[128]; 636#endif 637 638 if (Reboot) { 639 /* Instead of going single user, let's reboot the machine */ 640 sync(); 641 alarm(2); 642 pause(); 643 reboot(howto); 644 _exit(0); 645 } 646 647 shell = get_shell(); 648 649 if ((pid = fork()) == 0) { 650 /* 651 * Start the single user session. 652 */ 653 setctty(_PATH_CONSOLE); 654 655#ifdef SECURE 656 /* 657 * Check the root password. 658 * We don't care if the console is 'on' by default; 659 * it's the only tty that can be 'off' and 'secure'. 660 */ 661 typ = getttynam("console"); 662 pp = getpwnam("root"); 663 if (typ && (typ->ty_status & TTY_SECURE) == 0 && 664 pp && *pp->pw_passwd) { 665 write_stderr(banner); 666 for (;;) { 667 clear = getpass("Password:"); 668 if (clear == 0 || *clear == '\0') 669 _exit(0); 670 password = crypt(clear, pp->pw_passwd); 671 bzero(clear, _PASSWORD_LEN); 672 if (strcmp(password, pp->pw_passwd) == 0) 673 break; 674 warning("single-user login failed\n"); 675 } 676 } 677 endttyent(); 678 endpwent(); 679#endif /* SECURE */ 680 681#ifdef DEBUGSHELL 682 { 683 char *cp = altshell; 684 int num; 685 686#define SHREQUEST "Enter full pathname of shell or RETURN for " 687 write_stderr(SHREQUEST); 688 write_stderr(shell); 689 write_stderr(": "); 690 while ((num = read(STDIN_FILENO, cp, 1)) != -1 && 691 num != 0 && *cp != '\n' && cp < &altshell[127]) 692 cp++; 693 *cp = '\0'; 694 if (altshell[0] != '\0') 695 shell = altshell; 696 } 697#endif /* DEBUGSHELL */ 698 699 /* 700 * Unblock signals. 701 * We catch all the interesting ones, 702 * and those are reset to SIG_DFL on exec. 703 */ 704 sigemptyset(&mask); 705 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0); 706 707 /* 708 * Fire off a shell. 709 * If the default one doesn't work, try the Bourne shell. 710 */ 711 712 char name[] = "-sh"; 713 714 argv[0] = name; 715 argv[1] = 0; 716 execv(shell, argv); 717 emergency("can't exec %s for single user: %m", shell); 718 execv(_PATH_BSHELL, argv); 719 emergency("can't exec %s for single user: %m", _PATH_BSHELL); 720 sleep(STALL_TIMEOUT); 721 _exit(1); 722 } 723 724 if (pid == -1) { 725 /* 726 * We are seriously hosed. Do our best. 727 */ 728 emergency("can't fork single-user shell, trying again"); 729 while (waitpid(-1, (int *) 0, WNOHANG) > 0) 730 continue; 731 return (state_func_t) single_user; 732 } 733 734 requested_transition = 0; 735 do { 736 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 737 collect_child(wpid); 738 if (wpid == -1) { 739 if (errno == EINTR) 740 continue; 741 warning("wait for single-user shell failed: %m; restarting"); 742 return (state_func_t) single_user; 743 } 744 if (wpid == pid && WIFSTOPPED(status)) { 745 warning("init: shell stopped, restarting\n"); 746 kill(pid, SIGCONT); 747 wpid = -1; 748 } 749 } while (wpid != pid && !requested_transition); 750 751 if (requested_transition) 752 return (state_func_t) requested_transition; 753 754 if (!WIFEXITED(status)) { 755 if (WTERMSIG(status) == SIGKILL) { 756 /* 757 * reboot(8) killed shell? 758 */ 759 warning("single user shell terminated."); 760 sleep(STALL_TIMEOUT); 761 _exit(0); 762 } else { 763 warning("single user shell terminated, restarting"); 764 return (state_func_t) single_user; 765 } 766 } 767 768 runcom_mode = FASTBOOT; 769 return (state_func_t) runcom; 770} 771 772/* 773 * Run the system startup script. 774 */ 775state_func_t 776runcom(void) 777{ 778 state_func_t next_transition; 779 780 if ((next_transition = run_script(_PATH_RUNCOM)) != 0) 781 return next_transition; 782 783 runcom_mode = AUTOBOOT; /* the default */ 784 /* NB: should send a message to the session logger to avoid blocking. */ 785 logwtmp("~", "reboot", ""); 786 return (state_func_t) read_ttys; 787} 788 789/* 790 * Run a shell script. 791 * Returns 0 on success, otherwise the next transition to enter: 792 * - single_user if fork/execv/waitpid failed, or if the script 793 * terminated with a signal or exit code != 0. 794 * - death if a SIGTERM was delivered to init(8). 795 */ 796state_func_t 797run_script(const char *script) 798{ 799 pid_t pid, wpid; 800 int status; 801 char *argv[4]; 802 const char *shell; 803 struct sigaction sa; 804 805 shell = get_shell(); 806 807 if ((pid = fork()) == 0) { 808 sigemptyset(&sa.sa_mask); 809 sa.sa_flags = 0; 810 sa.sa_handler = SIG_IGN; 811 sigaction(SIGTSTP, &sa, (struct sigaction *)0); 812 sigaction(SIGHUP, &sa, (struct sigaction *)0); 813 814 setctty(_PATH_CONSOLE); 815 816 char _sh[] = "sh"; 817 char _autoboot[] = "autoboot"; 818 819 argv[0] = _sh; 820 argv[1] = __DECONST(char *, script); 821 argv[2] = runcom_mode == AUTOBOOT ? _autoboot : 0; 822 argv[3] = 0; 823 824 sigprocmask(SIG_SETMASK, &sa.sa_mask, (sigset_t *) 0); 825 826#ifdef LOGIN_CAP 827 setprocresources(RESOURCE_RC); 828#endif 829 execv(shell, argv); 830 stall("can't exec %s for %s: %m", shell, script); 831 _exit(1); /* force single user mode */ 832 } 833 834 if (pid == -1) { 835 emergency("can't fork for %s on %s: %m", shell, script); 836 while (waitpid(-1, (int *) 0, WNOHANG) > 0) 837 continue; 838 sleep(STALL_TIMEOUT); 839 return (state_func_t) single_user; 840 } 841 842 /* 843 * Copied from single_user(). This is a bit paranoid. 844 */ 845 requested_transition = 0; 846 do { 847 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 848 collect_child(wpid); 849 if (wpid == -1) { 850 if (requested_transition == death) 851 return (state_func_t) death; 852 if (errno == EINTR) 853 continue; 854 warning("wait for %s on %s failed: %m; going to " 855 "single user mode", shell, script); 856 return (state_func_t) single_user; 857 } 858 if (wpid == pid && WIFSTOPPED(status)) { 859 warning("init: %s on %s stopped, restarting\n", 860 shell, script); 861 kill(pid, SIGCONT); 862 wpid = -1; 863 } 864 } while (wpid != pid); 865 866 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGTERM && 867 requested_transition == catatonia) { 868 /* /etc/rc executed /sbin/reboot; wait for the end quietly */ 869 sigset_t s; 870 871 sigfillset(&s); 872 for (;;) 873 sigsuspend(&s); 874 } 875 876 if (!WIFEXITED(status)) { 877 warning("%s on %s terminated abnormally, going to single " 878 "user mode", shell, script); 879 return (state_func_t) single_user; 880 } 881 882 if (WEXITSTATUS(status)) 883 return (state_func_t) single_user; 884 885 return (state_func_t) 0; 886} 887 888/* 889 * Open the session database. 890 * 891 * NB: We could pass in the size here; is it necessary? 892 */ 893int 894start_session_db(void) 895{ 896 if (session_db && (*session_db->close)(session_db)) 897 emergency("session database close: %s", strerror(errno)); 898 if ((session_db = dbopen(NULL, O_RDWR, 0, DB_HASH, NULL)) == 0) { 899 emergency("session database open: %s", strerror(errno)); 900 return (1); 901 } 902 return (0); 903 904} 905 906/* 907 * Add a new login session. 908 */ 909void 910add_session(session_t *sp) 911{ 912 DBT key; 913 DBT data; 914 915 key.data = &sp->se_process; 916 key.size = sizeof sp->se_process; 917 data.data = &sp; 918 data.size = sizeof sp; 919 920 if ((*session_db->put)(session_db, &key, &data, 0)) 921 emergency("insert %d: %s", sp->se_process, strerror(errno)); 922} 923 924/* 925 * Delete an old login session. 926 */ 927void 928del_session(session_t *sp) 929{ 930 DBT key; 931 932 key.data = &sp->se_process; 933 key.size = sizeof sp->se_process; 934 935 if ((*session_db->del)(session_db, &key, 0)) 936 emergency("delete %d: %s", sp->se_process, strerror(errno)); 937} 938 939/* 940 * Look up a login session by pid. 941 */ 942session_t * 943find_session(pid_t pid) 944{ 945 DBT key; 946 DBT data; 947 session_t *ret; 948 949 key.data = &pid; 950 key.size = sizeof pid; 951 if ((*session_db->get)(session_db, &key, &data, 0) != 0) 952 return 0; 953 bcopy(data.data, (char *)&ret, sizeof(ret)); 954 return ret; 955} 956 957/* 958 * Construct an argument vector from a command line. 959 */ 960char ** 961construct_argv(char *command) 962{ 963 int argc = 0; 964 char **argv = (char **) malloc(((strlen(command) + 1) / 2 + 1) 965 * sizeof (char *)); 966 967 if ((argv[argc++] = strk(command)) == 0) { 968 free(argv); 969 return (NULL); 970 } 971 while ((argv[argc++] = strk((char *) 0)) != NULL) 972 continue; 973 return argv; 974} 975 976/* 977 * Deallocate a session descriptor. 978 */ 979void 980free_session(session_t *sp) 981{ 982 free(sp->se_device); 983 if (sp->se_getty) { 984 free(sp->se_getty); 985 free(sp->se_getty_argv_space); 986 free(sp->se_getty_argv); 987 } 988 if (sp->se_window) { 989 free(sp->se_window); 990 free(sp->se_window_argv_space); 991 free(sp->se_window_argv); 992 } 993 if (sp->se_type) 994 free(sp->se_type); 995 free(sp); 996} 997 998/* 999 * Allocate a new session descriptor. 1000 * Mark it SE_PRESENT. 1001 */ 1002session_t * 1003new_session(session_t *sprev, int session_index, struct ttyent *typ) 1004{ 1005 session_t *sp; 1006 int fd; 1007 1008 if ((typ->ty_status & TTY_ON) == 0 || 1009 typ->ty_name == 0 || 1010 typ->ty_getty == 0) 1011 return 0; 1012 1013 sp = (session_t *) calloc(1, sizeof (session_t)); 1014 1015 sp->se_index = session_index; 1016 sp->se_flags |= SE_PRESENT; 1017 1018 sp->se_device = malloc(sizeof(_PATH_DEV) + strlen(typ->ty_name)); 1019 sprintf(sp->se_device, "%s%s", _PATH_DEV, typ->ty_name); 1020 1021 /* 1022 * Attempt to open the device, if we get "device not configured" 1023 * then don't add the device to the session list. 1024 */ 1025 if ((fd = open(sp->se_device, O_RDONLY | O_NONBLOCK, 0)) < 0) { 1026 if (errno == ENXIO) { 1027 free_session(sp); 1028 return (0); 1029 } 1030 } else 1031 close(fd); 1032 1033 if (setupargv(sp, typ) == 0) { 1034 free_session(sp); 1035 return (0); 1036 } 1037 1038 sp->se_next = 0; 1039 if (sprev == 0) { 1040 sessions = sp; 1041 sp->se_prev = 0; 1042 } else { 1043 sprev->se_next = sp; 1044 sp->se_prev = sprev; 1045 } 1046 1047 return sp; 1048} 1049 1050/* 1051 * Calculate getty and if useful window argv vectors. 1052 */ 1053int 1054setupargv(session_t *sp, struct ttyent *typ) 1055{ 1056 1057 if (sp->se_getty) { 1058 free(sp->se_getty); 1059 free(sp->se_getty_argv_space); 1060 free(sp->se_getty_argv); 1061 } 1062 sp->se_getty = malloc(strlen(typ->ty_getty) + strlen(typ->ty_name) + 2); 1063 sprintf(sp->se_getty, "%s %s", typ->ty_getty, typ->ty_name); 1064 sp->se_getty_argv_space = strdup(sp->se_getty); 1065 sp->se_getty_argv = construct_argv(sp->se_getty_argv_space); 1066 if (sp->se_getty_argv == 0) { 1067 warning("can't parse getty for port %s", sp->se_device); 1068 free(sp->se_getty); 1069 free(sp->se_getty_argv_space); 1070 sp->se_getty = sp->se_getty_argv_space = 0; 1071 return (0); 1072 } 1073 if (sp->se_window) { 1074 free(sp->se_window); 1075 free(sp->se_window_argv_space); 1076 free(sp->se_window_argv); 1077 } 1078 sp->se_window = sp->se_window_argv_space = 0; 1079 sp->se_window_argv = 0; 1080 if (typ->ty_window) { 1081 sp->se_window = strdup(typ->ty_window); 1082 sp->se_window_argv_space = strdup(sp->se_window); 1083 sp->se_window_argv = construct_argv(sp->se_window_argv_space); 1084 if (sp->se_window_argv == 0) { 1085 warning("can't parse window for port %s", 1086 sp->se_device); 1087 free(sp->se_window_argv_space); 1088 free(sp->se_window); 1089 sp->se_window = sp->se_window_argv_space = 0; 1090 return (0); 1091 } 1092 } 1093 if (sp->se_type) 1094 free(sp->se_type); 1095 sp->se_type = typ->ty_type ? strdup(typ->ty_type) : 0; 1096 return (1); 1097} 1098 1099/* 1100 * Walk the list of ttys and create sessions for each active line. 1101 */ 1102state_func_t 1103read_ttys(void) 1104{ 1105 int session_index = 0; 1106 session_t *sp, *snext; 1107 struct ttyent *typ; 1108 1109 /* 1110 * Destroy any previous session state. 1111 * There shouldn't be any, but just in case... 1112 */ 1113 for (sp = sessions; sp; sp = snext) { 1114 if (sp->se_process) 1115 clear_session_logs(sp); 1116 snext = sp->se_next; 1117 free_session(sp); 1118 } 1119 sessions = 0; 1120 if (start_session_db()) 1121 return (state_func_t) single_user; 1122 1123 /* 1124 * Allocate a session entry for each active port. 1125 * Note that sp starts at 0. 1126 */ 1127 while ((typ = getttyent()) != NULL) 1128 if ((snext = new_session(sp, ++session_index, typ)) != NULL) 1129 sp = snext; 1130 1131 endttyent(); 1132 1133 return (state_func_t) multi_user; 1134} 1135 1136/* 1137 * Start a window system running. 1138 */ 1139void 1140start_window_system(session_t *sp) 1141{ 1142 pid_t pid; 1143 sigset_t mask; 1144 char term[64], *env[2]; 1145 int status; 1146 1147 if ((pid = fork()) == -1) { 1148 emergency("can't fork for window system on port %s: %m", 1149 sp->se_device); 1150 /* hope that getty fails and we can try again */ 1151 return; 1152 } 1153 if (pid) { 1154 waitpid(-1, &status, 0); 1155 return; 1156 } 1157 1158 /* reparent window process to the init to not make a zombie on exit */ 1159 if ((pid = fork()) == -1) { 1160 emergency("can't fork for window system on port %s: %m", 1161 sp->se_device); 1162 _exit(1); 1163 } 1164 if (pid) 1165 _exit(0); 1166 1167 sigemptyset(&mask); 1168 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0); 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 */ 1194pid_t 1195start_getty(session_t *sp) 1196{ 1197 pid_t pid; 1198 sigset_t mask; 1199 time_t current_time = time((time_t *) 0); 1200 int too_quick = 0; 1201 char term[64], *env[2]; 1202 1203 if (current_time >= sp->se_started && 1204 current_time - sp->se_started < 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, (sigset_t *) 0); 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 } else 1247 env[0] = 0; 1248 execve(sp->se_getty_argv[0], sp->se_getty_argv, env); 1249 stall("can't exec getty '%s' for port %s: %m", 1250 sp->se_getty_argv[0], sp->se_device); 1251 _exit(1); 1252} 1253 1254/* 1255 * Collect exit status for a child. 1256 * If an exiting login, start a new login running. 1257 */ 1258void 1259collect_child(pid_t pid) 1260{ 1261 session_t *sp, *sprev, *snext; 1262 1263 if (! sessions) 1264 return; 1265 1266 if (! (sp = find_session(pid))) 1267 return; 1268 1269 clear_session_logs(sp); 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 */ 1298void 1299transition_handler(int sig) 1300{ 1301 1302 switch (sig) { 1303 case SIGHUP: 1304 requested_transition = clean_ttys; 1305 break; 1306 case SIGUSR2: 1307 howto = RB_POWEROFF; 1308 case SIGUSR1: 1309 howto |= RB_HALT; 1310 case SIGINT: 1311 Reboot = TRUE; 1312 case SIGTERM: 1313 requested_transition = death; 1314 break; 1315 case SIGTSTP: 1316 requested_transition = catatonia; 1317 break; 1318 default: 1319 requested_transition = 0; 1320 break; 1321 } 1322} 1323 1324/* 1325 * Take the system multiuser. 1326 */ 1327state_func_t 1328multi_user(void) 1329{ 1330 pid_t pid; 1331 session_t *sp; 1332 1333 requested_transition = 0; 1334 1335 /* 1336 * If the administrator has not set the security level to -1 1337 * to indicate that the kernel should not run multiuser in secure 1338 * mode, and the run script has not set a higher level of security 1339 * than level 1, then put the kernel into secure mode. 1340 */ 1341 if (getsecuritylevel() == 0) 1342 setsecuritylevel(1); 1343 1344 for (sp = sessions; sp; sp = sp->se_next) { 1345 if (sp->se_process) 1346 continue; 1347 if ((pid = start_getty(sp)) == -1) { 1348 /* serious trouble */ 1349 requested_transition = clean_ttys; 1350 break; 1351 } 1352 sp->se_process = pid; 1353 sp->se_started = time((time_t *) 0); 1354 add_session(sp); 1355 } 1356 1357 while (!requested_transition) 1358 if ((pid = waitpid(-1, (int *) 0, 0)) != -1) 1359 collect_child(pid); 1360 1361 return (state_func_t) requested_transition; 1362} 1363 1364/* 1365 * This is an (n*2)+(n^2) algorithm. We hope it isn't run often... 1366 */ 1367state_func_t 1368clean_ttys(void) 1369{ 1370 session_t *sp, *sprev; 1371 struct ttyent *typ; 1372 int session_index = 0; 1373 int devlen; 1374 char *old_getty, *old_window, *old_type; 1375 1376 /* 1377 * mark all sessions for death, (!SE_PRESENT) 1378 * as we find or create new ones they'll be marked as keepers, 1379 * we'll later nuke all the ones not found in /etc/ttys 1380 */ 1381 for (sp = sessions; sp != NULL; sp = sp->se_next) 1382 sp->se_flags &= ~SE_PRESENT; 1383 1384 devlen = sizeof(_PATH_DEV) - 1; 1385 while ((typ = getttyent()) != NULL) { 1386 ++session_index; 1387 1388 for (sprev = 0, sp = sessions; sp; sprev = sp, sp = sp->se_next) 1389 if (strcmp(typ->ty_name, sp->se_device + devlen) == 0) 1390 break; 1391 1392 if (sp) { 1393 /* we want this one to live */ 1394 sp->se_flags |= SE_PRESENT; 1395 if (sp->se_index != session_index) { 1396 warning("port %s changed utmp index from %d to %d", 1397 sp->se_device, sp->se_index, 1398 session_index); 1399 sp->se_index = session_index; 1400 } 1401 if ((typ->ty_status & TTY_ON) == 0 || 1402 typ->ty_getty == 0) { 1403 sp->se_flags |= SE_SHUTDOWN; 1404 kill(sp->se_process, SIGHUP); 1405 continue; 1406 } 1407 sp->se_flags &= ~SE_SHUTDOWN; 1408 old_getty = sp->se_getty ? strdup(sp->se_getty) : 0; 1409 old_window = sp->se_window ? strdup(sp->se_window) : 0; 1410 old_type = sp->se_type ? strdup(sp->se_type) : 0; 1411 if (setupargv(sp, typ) == 0) { 1412 warning("can't parse getty for port %s", 1413 sp->se_device); 1414 sp->se_flags |= SE_SHUTDOWN; 1415 kill(sp->se_process, SIGHUP); 1416 } 1417 else if ( !old_getty 1418 || (!old_type && sp->se_type) 1419 || (old_type && !sp->se_type) 1420 || (!old_window && sp->se_window) 1421 || (old_window && !sp->se_window) 1422 || (strcmp(old_getty, sp->se_getty) != 0) 1423 || (old_window && strcmp(old_window, sp->se_window) != 0) 1424 || (old_type && strcmp(old_type, sp->se_type) != 0) 1425 ) { 1426 /* Don't set SE_SHUTDOWN here */ 1427 sp->se_nspace = 0; 1428 sp->se_started = 0; 1429 kill(sp->se_process, SIGHUP); 1430 } 1431 if (old_getty) 1432 free(old_getty); 1433 if (old_window) 1434 free(old_window); 1435 if (old_type) 1436 free(old_type); 1437 continue; 1438 } 1439 1440 new_session(sprev, session_index, typ); 1441 } 1442 1443 endttyent(); 1444 1445 /* 1446 * sweep through and kill all deleted sessions 1447 * ones who's /etc/ttys line was deleted (SE_PRESENT unset) 1448 */ 1449 for (sp = sessions; sp != NULL; sp = sp->se_next) { 1450 if ((sp->se_flags & SE_PRESENT) == 0) { 1451 sp->se_flags |= SE_SHUTDOWN; 1452 kill(sp->se_process, SIGHUP); 1453 } 1454 } 1455 1456 return (state_func_t) multi_user; 1457} 1458 1459/* 1460 * Block further logins. 1461 */ 1462state_func_t 1463catatonia(void) 1464{ 1465 session_t *sp; 1466 1467 for (sp = sessions; sp; sp = sp->se_next) 1468 sp->se_flags |= SE_SHUTDOWN; 1469 1470 return (state_func_t) multi_user; 1471} 1472 1473/* 1474 * Note SIGALRM. 1475 */ 1476void 1477alrm_handler(int sig) 1478{ 1479 1480 (void)sig; 1481 clang = 1; 1482} 1483 1484/* 1485 * Bring the system down to single user. 1486 */ 1487state_func_t 1488death(void) 1489{ 1490 session_t *sp; 1491 int i; 1492 pid_t pid; 1493 static const int death_sigs[2] = { SIGTERM, SIGKILL }; 1494 1495 /* NB: should send a message to the session logger to avoid blocking. */ 1496 logwtmp("~", "shutdown", ""); 1497 1498 for (sp = sessions; sp; sp = sp->se_next) { 1499 sp->se_flags |= SE_SHUTDOWN; 1500 kill(sp->se_process, SIGHUP); 1501 } 1502 1503 /* Try to run the rc.shutdown script within a period of time */ 1504 runshutdown(); 1505 1506 for (i = 0; i < 2; ++i) { 1507 if (kill(-1, death_sigs[i]) == -1 && errno == ESRCH) 1508 return (state_func_t) single_user; 1509 1510 clang = 0; 1511 alarm(DEATH_WATCH); 1512 do 1513 if ((pid = waitpid(-1, (int *)0, 0)) != -1) 1514 collect_child(pid); 1515 while (clang == 0 && errno != ECHILD); 1516 1517 if (errno == ECHILD) 1518 return (state_func_t) single_user; 1519 } 1520 1521 warning("some processes would not die; ps axl advised"); 1522 1523 return (state_func_t) single_user; 1524} 1525 1526/* 1527 * Run the system shutdown script. 1528 * 1529 * Exit codes: XXX I should document more 1530 * -2 shutdown script terminated abnormally 1531 * -1 fatal error - can't run script 1532 * 0 good. 1533 * >0 some error (exit code) 1534 */ 1535int 1536runshutdown(void) 1537{ 1538 pid_t pid, wpid; 1539 int status; 1540 int shutdowntimeout; 1541 size_t len; 1542 char *argv[4]; 1543 const char *shell; 1544 struct sigaction sa; 1545 struct stat sb; 1546 1547 /* 1548 * rc.shutdown is optional, so to prevent any unnecessary 1549 * complaints from the shell we simply don't run it if the 1550 * file does not exist. If the stat() here fails for other 1551 * reasons, we'll let the shell complain. 1552 */ 1553 if (stat(_PATH_RUNDOWN, &sb) == -1 && errno == ENOENT) 1554 return 0; 1555 1556 shell = get_shell(); 1557 1558 if ((pid = fork()) == 0) { 1559 int fd; 1560 1561 /* Assume that init already grab console as ctty before */ 1562 1563 sigemptyset(&sa.sa_mask); 1564 sa.sa_flags = 0; 1565 sa.sa_handler = SIG_IGN; 1566 sigaction(SIGTSTP, &sa, (struct sigaction *)0); 1567 sigaction(SIGHUP, &sa, (struct sigaction *)0); 1568 1569 if ((fd = open(_PATH_CONSOLE, O_RDWR)) == -1) 1570 warning("can't open %s: %m", _PATH_CONSOLE); 1571 else { 1572 dup2(fd, 0); 1573 dup2(fd, 1); 1574 dup2(fd, 2); 1575 if (fd > 2) 1576 close(fd); 1577 } 1578 1579 /* 1580 * Run the shutdown script. 1581 */ 1582 1583 char _sh[] = "sh"; 1584 char _reboot[] = "reboot"; 1585 char _single[] = "single"; 1586 char _path_rundown[] = _PATH_RUNDOWN; 1587 1588 argv[0] = _sh; 1589 argv[1] = _path_rundown; 1590 argv[2] = Reboot ? _reboot : _single; 1591 argv[3] = 0; 1592 1593 sigprocmask(SIG_SETMASK, &sa.sa_mask, (sigset_t *) 0); 1594 1595#ifdef LOGIN_CAP 1596 setprocresources(RESOURCE_RC); 1597#endif 1598 execv(shell, argv); 1599 warning("can't exec %s for %s: %m", shell, _PATH_RUNDOWN); 1600 _exit(1); /* force single user mode */ 1601 } 1602 1603 if (pid == -1) { 1604 emergency("can't fork for %s on %s: %m", shell, _PATH_RUNDOWN); 1605 while (waitpid(-1, (int *) 0, WNOHANG) > 0) 1606 continue; 1607 sleep(STALL_TIMEOUT); 1608 return -1; 1609 } 1610 1611 len = sizeof(shutdowntimeout); 1612 if (sysctlbyname("kern.init_shutdown_timeout", &shutdowntimeout, &len, 1613 NULL, 0) == -1 || shutdowntimeout < 2) 1614 shutdowntimeout = DEATH_SCRIPT; 1615 alarm(shutdowntimeout); 1616 clang = 0; 1617 /* 1618 * Copied from single_user(). This is a bit paranoid. 1619 * Use the same ALRM handler. 1620 */ 1621 do { 1622 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 1623 collect_child(wpid); 1624 if (clang == 1) { 1625 /* we were waiting for the sub-shell */ 1626 kill(wpid, SIGTERM); 1627 warning("timeout expired for %s on %s: %m; going to " 1628 "single user mode", shell, _PATH_RUNDOWN); 1629 return -1; 1630 } 1631 if (wpid == -1) { 1632 if (errno == EINTR) 1633 continue; 1634 warning("wait for %s on %s failed: %m; going to " 1635 "single user mode", shell, _PATH_RUNDOWN); 1636 return -1; 1637 } 1638 if (wpid == pid && WIFSTOPPED(status)) { 1639 warning("init: %s on %s stopped, restarting\n", 1640 shell, _PATH_RUNDOWN); 1641 kill(pid, SIGCONT); 1642 wpid = -1; 1643 } 1644 } while (wpid != pid && !clang); 1645 1646 /* Turn off the alarm */ 1647 alarm(0); 1648 1649 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGTERM && 1650 requested_transition == catatonia) { 1651 /* 1652 * /etc/rc.shutdown executed /sbin/reboot; 1653 * wait for the end quietly 1654 */ 1655 sigset_t s; 1656 1657 sigfillset(&s); 1658 for (;;) 1659 sigsuspend(&s); 1660 } 1661 1662 if (!WIFEXITED(status)) { 1663 warning("%s on %s terminated abnormally, going to " 1664 "single user mode", shell, _PATH_RUNDOWN); 1665 return -2; 1666 } 1667 1668 if ((status = WEXITSTATUS(status)) != 0) 1669 warning("%s returned status %d", _PATH_RUNDOWN, status); 1670 1671 return status; 1672} 1673 1674static char * 1675strk(char *p) 1676{ 1677 static char *t; 1678 char *q; 1679 int c; 1680 1681 if (p) 1682 t = p; 1683 if (!t) 1684 return 0; 1685 1686 c = *t; 1687 while (c == ' ' || c == '\t' ) 1688 c = *++t; 1689 if (!c) { 1690 t = 0; 1691 return 0; 1692 } 1693 q = t; 1694 if (c == '\'') { 1695 c = *++t; 1696 q = t; 1697 while (c && c != '\'') 1698 c = *++t; 1699 if (!c) /* unterminated string */ 1700 q = t = 0; 1701 else 1702 *t++ = 0; 1703 } else { 1704 while (c && c != ' ' && c != '\t' ) 1705 c = *++t; 1706 *t++ = 0; 1707 if (!c) 1708 t = 0; 1709 } 1710 return q; 1711} 1712 1713#ifdef LOGIN_CAP 1714void 1715setprocresources(const char *cname) 1716{ 1717 login_cap_t *lc; 1718 if ((lc = login_getclassbyname(cname, NULL)) != NULL) { 1719 setusercontext(lc, (struct passwd*)NULL, 0, 1720 LOGIN_SETPRIORITY | LOGIN_SETRESOURCES); 1721 login_close(lc); 1722 } 1723} 1724#endif 1725