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