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 84 /* 85 * User-based resource limits. 86 */ 87 #define RESOURCE_RC "daemon" 88 #define RESOURCE_WINDOW "default" 89 #define RESOURCE_GETTY "default" 90 91 #ifndef DEFAULT_STATE 92 #define DEFAULT_STATE runcom 93 #endif 94 95 typedef enum { 96 invalid_state, 97 single_user, 98 runcom, 99 read_ttys, 100 multi_user, 101 clean_ttys, 102 catatonia, 103 death 104 } state_t; 105 typedef state_t (*state_func_t)(void); 106 107 static state_t f_single_user(void); 108 static state_t f_runcom(void); 109 static state_t f_read_ttys(void); 110 static state_t f_multi_user(void); 111 static state_t f_clean_ttys(void); 112 static state_t f_catatonia(void); 113 static state_t f_death(void); 114 115 state_func_t state_funcs[] = { 116 NULL, 117 f_single_user, 118 f_runcom, 119 f_read_ttys, 120 f_multi_user, 121 f_clean_ttys, 122 f_catatonia, 123 f_death 124 }; 125 126 enum { AUTOBOOT, FASTBOOT } runcom_mode = AUTOBOOT; 127 #define FALSE 0 128 #define TRUE 1 129 130 static void transition(state_t); 131 static volatile sig_atomic_t requested_transition = DEFAULT_STATE; 132 133 static void setctty(const char *); 134 135 typedef struct init_session { 136 int se_index; /* index of entry in ttys file */ 137 pid_t se_process; /* controlling process */ 138 struct timeval se_started; /* used to avoid thrashing */ 139 int se_flags; /* status of session */ 140 #define SE_SHUTDOWN 0x1 /* session won't be restarted */ 141 #define SE_PRESENT 0x2 /* session is in /etc/ttys */ 142 int se_nspace; /* spacing count */ 143 char *se_device; /* filename of port */ 144 char *se_getty; /* what to run on that port */ 145 char *se_getty_argv_space; /* pre-parsed argument array space */ 146 char **se_getty_argv; /* pre-parsed argument array */ 147 char *se_window; /* window system (started only once) */ 148 char *se_window_argv_space; /* pre-parsed argument array space */ 149 char **se_window_argv; /* pre-parsed argument array */ 150 char *se_type; /* default terminal type */ 151 struct init_session *se_prev; 152 struct init_session *se_next; 153 } session_t; 154 155 static void handle(sig_t, ...); 156 static void delset(sigset_t *, ...); 157 158 static void stall(const char *, ...) __printflike(1, 2); 159 static void warning(const char *, ...) __printflike(1, 2); 160 static void emergency(const char *, ...) __printflike(1, 2); 161 static void disaster(int); 162 static void badsys(int); 163 static int runshutdown(void); 164 static char *strk(char *); 165 166 #define DEATH 'd' 167 #define SINGLE_USER 's' 168 #define RUNCOM 'r' 169 #define READ_TTYS 't' 170 #define MULTI_USER 'm' 171 #define CLEAN_TTYS 'T' 172 #define CATATONIA 'c' 173 174 static void free_session(session_t *); 175 static session_t *new_session(session_t *, int, struct ttyent *); 176 static void adjttyent(struct ttyent *typ); 177 178 static char **construct_argv(char *); 179 static void start_window_system(session_t *); 180 static void collect_child(pid_t, int); 181 static pid_t start_getty(session_t *); 182 static void transition_handler(int); 183 static void alrm_handler(int); 184 static void setsecuritylevel(int); 185 static int getsecuritylevel(void); 186 static char *get_chroot(void); 187 static int setupargv(session_t *, struct ttyent *); 188 #ifdef LOGIN_CAP 189 static void setprocresources(const char *); 190 #endif 191 192 static void clear_session_logs(session_t *, int); 193 194 static int start_session_db(void); 195 static void add_session(session_t *); 196 static void del_session(session_t *); 197 static session_t *find_session(pid_t); 198 199 static struct timeval boot_time; 200 state_t current_state = death; 201 static void session_utmpx(const session_t *, int); 202 static void make_utmpx(const char *, const char *, int, pid_t, 203 const struct timeval *, int); 204 static char get_runlevel(const state_t); 205 static void utmpx_set_runlevel(char, char); 206 207 static int Reboot = FALSE; 208 static int howto = RB_AUTOBOOT; 209 210 static DB *session_db; 211 static volatile sig_atomic_t clang; 212 static session_t *sessions; 213 214 /* 215 * The mother of all processes. 216 */ 217 int 218 main(int argc, char *argv[]) 219 { 220 char *init_chroot; 221 int c; 222 struct sigaction sa; 223 sigset_t mask; 224 struct stat sts; 225 226 (void)gettimeofday(&boot_time, NULL); 227 228 /* Dispose of random users. */ 229 if (getuid() != 0) 230 errx(1, "%s", strerror(EPERM)); 231 232 /* System V users like to reexec init. */ 233 if (getpid() != 1) { 234 #ifdef COMPAT_SYSV_INIT 235 /* So give them what they want */ 236 if (argc > 1) { 237 if (strlen(argv[1]) == 1) { 238 char runlevel = *argv[1]; 239 int sig; 240 241 switch (runlevel) { 242 case '0': /* halt + poweroff */ 243 sig = SIGUSR2; 244 break; 245 case '1': /* single-user */ 246 sig = SIGTERM; 247 break; 248 case '6': /* reboot */ 249 sig = SIGINT; 250 break; 251 case 'c': /* block further logins */ 252 sig = SIGTSTP; 253 break; 254 case 'q': /* rescan /etc/ttys */ 255 sig = SIGHUP; 256 break; 257 default: 258 goto invalid; 259 } 260 kill(1, sig); 261 _exit(0); 262 } else 263 invalid: 264 errx(1, "invalid run-level ``%s''", argv[1]); 265 } else 266 #endif 267 errx(1, "already running"); 268 } 269 /* 270 * Note that this does NOT open a file... 271 * Does 'init' deserve its own facility number? 272 */ 273 openlog("init", LOG_CONS, LOG_AUTH); 274 275 /* 276 * If chroot has been requested by the boot loader, 277 * do it now. Try to be robust: If the directory 278 * doesn't exist, continue anyway. 279 */ 280 init_chroot = get_chroot(); 281 if (init_chroot != NULL) { 282 if (chdir(init_chroot) == -1 || chroot(".") == -1) 283 warning("can't chroot to %s: %m", init_chroot); 284 free(init_chroot); 285 } 286 287 /* 288 * Create an initial session. 289 */ 290 if (setsid() < 0) 291 warning("initial setsid() failed: %m"); 292 293 /* 294 * Establish an initial user so that programs running 295 * single user do not freak out and die (like passwd). 296 */ 297 if (setlogin("root") < 0) 298 warning("setlogin() failed: %m"); 299 300 if (stat("/dev/null", &sts) < 0) { 301 warning("/dev MAY BE CORRUPT! /dev/null is missing!\n"); 302 sleep(5); 303 } 304 305 /* 306 * This code assumes that we always get arguments through flags, 307 * never through bits set in some random machine register. 308 */ 309 while ((c = getopt(argc, argv, "dsf")) != -1) 310 switch (c) { 311 case 'd': 312 /* We don't support DEVFS. */ 313 break; 314 case 's': 315 requested_transition = single_user; 316 break; 317 case 'f': 318 runcom_mode = FASTBOOT; 319 break; 320 default: 321 warning("unrecognized flag '-%c'", c); 322 break; 323 } 324 325 if (optind != argc) 326 warning("ignoring excess arguments"); 327 328 /* 329 * We catch or block signals rather than ignore them, 330 * so that they get reset on exec. 331 */ 332 handle(badsys, SIGSYS, 0); 333 handle(disaster, SIGABRT, SIGFPE, SIGILL, SIGSEGV, 334 SIGBUS, SIGXCPU, SIGXFSZ, 0); 335 handle(transition_handler, SIGHUP, SIGINT, SIGTERM, SIGTSTP, 336 SIGUSR1, SIGUSR2, 0); 337 handle(alrm_handler, SIGALRM, 0); 338 sigfillset(&mask); 339 delset(&mask, SIGABRT, SIGFPE, SIGILL, SIGSEGV, SIGBUS, SIGSYS, 340 SIGXCPU, SIGXFSZ, SIGHUP, SIGINT, SIGTERM, SIGTSTP, SIGALRM, 341 SIGUSR1, SIGUSR2, 0); 342 sigprocmask(SIG_SETMASK, &mask, NULL); 343 sigemptyset(&sa.sa_mask); 344 sa.sa_flags = 0; 345 sa.sa_handler = SIG_IGN; 346 sigaction(SIGTTIN, &sa, NULL); 347 sigaction(SIGTTOU, &sa, NULL); 348 349 /* 350 * Paranoia. 351 */ 352 close(0); 353 close(1); 354 close(2); 355 356 /* 357 * Start the state machine. 358 */ 359 transition(requested_transition); 360 361 /* 362 * Should never reach here. 363 */ 364 return 1; 365 } 366 367 /* 368 * Associate a function with a signal handler. 369 */ 370 static void 371 handle(sig_t handler, ...) 372 { 373 int sig; 374 struct sigaction sa; 375 sigset_t mask_everything; 376 va_list ap; 377 378 va_start(ap, handler); 379 380 sa.sa_handler = handler; 381 sigfillset(&mask_everything); 382 383 while ((sig = va_arg(ap, int)) != 0) { 384 sa.sa_mask = mask_everything; 385 /* XXX SA_RESTART? */ 386 sa.sa_flags = sig == SIGCHLD ? SA_NOCLDSTOP : 0; 387 sigaction(sig, &sa, NULL); 388 } 389 va_end(ap); 390 } 391 392 /* 393 * Delete a set of signals from a mask. 394 */ 395 static void 396 delset(sigset_t *maskp, ...) 397 { 398 int sig; 399 va_list ap; 400 401 va_start(ap, maskp); 402 403 while ((sig = va_arg(ap, int)) != 0) 404 sigdelset(maskp, sig); 405 va_end(ap); 406 } 407 408 /* 409 * Log a message and sleep for a while (to give someone an opportunity 410 * to read it and to save log or hardcopy output if the problem is chronic). 411 */ 412 static void 413 stall(const char *message, ...) 414 { 415 va_list ap; 416 417 va_start(ap, message); 418 419 vsyslog(LOG_ALERT, message, ap); 420 va_end(ap); 421 sleep(STALL_TIMEOUT); 422 } 423 424 /* 425 * Like stall(), but doesn't sleep. 426 * If cpp had variadic macros, the two functions could be #defines for another. 427 */ 428 static void 429 warning(const char *message, ...) 430 { 431 va_list ap; 432 433 va_start(ap, message); 434 435 vsyslog(LOG_ALERT, message, ap); 436 va_end(ap); 437 } 438 439 /* 440 * Log an emergency message. 441 */ 442 static void 443 emergency(const char *message, ...) 444 { 445 va_list ap; 446 447 va_start(ap, message); 448 449 vsyslog(LOG_EMERG, message, ap); 450 va_end(ap); 451 } 452 453 /* 454 * Catch a SIGSYS signal. 455 * 456 * These may arise if a system does not support sysctl. 457 * We tolerate up to 25 of these, then throw in the towel. 458 */ 459 static void 460 badsys(int sig) 461 { 462 static int badcount = 0; 463 464 if (badcount++ < 25) 465 return; 466 disaster(sig); 467 } 468 469 /* 470 * Catch an unexpected signal. 471 */ 472 static void 473 disaster(int sig) 474 { 475 emergency("fatal signal: %s", 476 (unsigned)sig < NSIG ? sys_siglist[sig] : "unknown signal"); 477 478 sleep(STALL_TIMEOUT); 479 _exit(sig); /* reboot */ 480 } 481 482 /* 483 * Get the security level of the kernel. 484 */ 485 static int 486 getsecuritylevel(void) 487 { 488 #ifdef KERN_SECURELVL 489 int name[2], curlevel; 490 size_t len; 491 492 name[0] = CTL_KERN; 493 name[1] = KERN_SECURELVL; 494 len = sizeof curlevel; 495 if (sysctl(name, 2, &curlevel, &len, NULL, 0) == -1) { 496 emergency("cannot get kernel security level: %s", 497 strerror(errno)); 498 return (-1); 499 } 500 return (curlevel); 501 #else 502 return (-1); 503 #endif 504 } 505 506 /* 507 * Get the value of the "init_chroot" variable from the 508 * kernel environment (or NULL if not set). 509 */ 510 511 static char * 512 get_chroot(void) 513 { 514 static const char ichname[] = "init_chroot="; /* includes '=' */ 515 const int ichlen = strlen(ichname); 516 int real_oid[CTL_MAXNAME]; 517 char sbuf[1024]; 518 size_t oidlen, slen; 519 char *res; 520 int i; 521 522 oidlen = NELEM(real_oid); 523 if (sysctlnametomib("kern.environment", real_oid, &oidlen)) { 524 warning("cannot find kern.environment base sysctl OID"); 525 return NULL; 526 } 527 if (oidlen + 1 >= NELEM(real_oid)) { 528 warning("kern.environment OID is too large!"); 529 return NULL; 530 } 531 res = NULL; 532 real_oid[oidlen] = 0; 533 534 for (i = 0; ; i++) { 535 real_oid[oidlen + 1] = i; 536 slen = sizeof(sbuf); 537 if (sysctl(real_oid, oidlen + 2, sbuf, &slen, NULL, 0) < 0) { 538 if (errno != ENOENT) 539 warning("sysctl kern.environment.%d: %m", i); 540 break; 541 } 542 543 /* 544 * slen includes the terminating \0, but do a few sanity 545 * checks anyway. 546 */ 547 if (slen == 0) 548 continue; 549 sbuf[slen - 1] = 0; 550 if (strncmp(sbuf, ichname, ichlen) != 0) 551 continue; 552 if (sbuf[ichlen]) 553 res = strdup(sbuf + ichlen); 554 break; 555 } 556 return (res); 557 } 558 559 /* 560 * Set the security level of the kernel. 561 */ 562 static void 563 setsecuritylevel(int newlevel) 564 { 565 #ifdef KERN_SECURELVL 566 int name[2], curlevel; 567 568 curlevel = getsecuritylevel(); 569 if (newlevel == curlevel) 570 return; 571 name[0] = CTL_KERN; 572 name[1] = KERN_SECURELVL; 573 if (sysctl(name, 2, NULL, NULL, &newlevel, sizeof newlevel) == -1) { 574 emergency( 575 "cannot change kernel security level from %d to %d: %s", 576 curlevel, newlevel, strerror(errno)); 577 return; 578 } 579 #ifdef SECURE 580 warning("kernel security level changed from %d to %d", 581 curlevel, newlevel); 582 #endif 583 #endif 584 } 585 586 /* 587 * Change states in the finite state machine. 588 * The initial state is passed as an argument. 589 */ 590 static void 591 transition(state_t s) 592 { 593 for (;;) { 594 utmpx_set_runlevel(get_runlevel(current_state), 595 get_runlevel(s)); 596 current_state = s; 597 s = (*state_funcs[s])(); 598 } 599 } 600 601 /* 602 * Close out the accounting files for a login session. 603 */ 604 static void 605 clear_session_logs(session_t *sp, int status) 606 { 607 char *line = sp->se_device + sizeof(_PATH_DEV) - 1; 608 609 if (logoutx(line, status, DEAD_PROCESS)) 610 logwtmpx(line, "", "", status, DEAD_PROCESS); 611 } 612 613 /* 614 * Start a session and allocate a controlling terminal. 615 * Only called by children of init after forking. 616 */ 617 static void 618 setctty(const char *name) 619 { 620 int fd; 621 622 revoke(name); 623 if ((fd = open(name, O_RDWR)) == -1) { 624 stall("can't open %s: %m", name); 625 _exit(1); 626 } 627 if (login_tty(fd) == -1) { 628 stall("can't get %s for controlling terminal: %m", name); 629 _exit(1); 630 } 631 } 632 633 /* 634 * Bring the system up single user. 635 */ 636 static state_t 637 f_single_user(void) 638 { 639 pid_t pid, wpid; 640 int status; 641 sigset_t mask; 642 const char *shell = _PATH_BSHELL; 643 const char *argv[2]; 644 #ifdef SECURE 645 struct ttyent *typ; 646 struct passwd *pp; 647 static const char banner[] = 648 "Enter root password, or ^D to go multi-user\n"; 649 char *clear, *password; 650 #endif 651 #ifdef DEBUGSHELL 652 char altshell[128]; 653 #endif 654 655 if (Reboot) { 656 /* Instead of going single user, let's reboot the machine */ 657 sync(); 658 alarm(2); 659 pause(); 660 reboot(howto); 661 _exit(0); 662 } 663 664 if ((pid = fork()) == 0) { 665 /* 666 * Start the single user session. 667 */ 668 setctty(_PATH_CONSOLE); 669 670 #ifdef SECURE 671 /* 672 * Check the root password. 673 * We don't care if the console is 'on' by default; 674 * it's the only tty that can be 'off' and 'secure'. 675 */ 676 typ = getttynam("console"); 677 pp = getpwnam("root"); 678 if (typ && (typ->ty_status & TTY_SECURE) == 0 && 679 pp && *pp->pw_passwd) { 680 write(2, banner, sizeof banner - 1); 681 for (;;) { 682 clear = getpass("Password:"); 683 if (clear == NULL || *clear == '\0') 684 _exit(0); 685 password = crypt(clear, pp->pw_passwd); 686 bzero(clear, _PASSWORD_LEN); 687 if (password != NULL && strcmp(password, pp->pw_passwd) == 0) 688 break; 689 warning("single-user login failed\n"); 690 } 691 } 692 endttyent(); 693 endpwent(); 694 #endif /* SECURE */ 695 696 #ifdef DEBUGSHELL 697 { 698 char *cp = altshell; 699 int num; 700 701 #define SHREQUEST \ 702 "Enter full pathname of shell or RETURN for " _PATH_BSHELL ": " 703 write(STDERR_FILENO, SHREQUEST, sizeof(SHREQUEST) - 1); 704 while ((num = read(STDIN_FILENO, cp, 1)) != -1 && 705 num != 0 && *cp != '\n' && cp < &altshell[127]) 706 cp++; 707 *cp = '\0'; 708 if (altshell[0] != '\0') 709 shell = altshell; 710 } 711 #endif /* DEBUGSHELL */ 712 713 /* 714 * Unblock signals. 715 * We catch all the interesting ones, 716 * and those are reset to SIG_DFL on exec. 717 */ 718 sigemptyset(&mask); 719 sigprocmask(SIG_SETMASK, &mask, NULL); 720 721 /* 722 * Fire off a shell. 723 * If the default one doesn't work, try the Bourne shell. 724 */ 725 argv[0] = "-sh"; 726 argv[1] = NULL; 727 execv(shell, __DECONST(char **, argv)); 728 emergency("can't exec %s for single user: %m", shell); 729 execv(_PATH_BSHELL, __DECONST(char **, argv)); 730 emergency("can't exec %s for single user: %m", _PATH_BSHELL); 731 sleep(STALL_TIMEOUT); 732 _exit(1); 733 } 734 735 if (pid == -1) { 736 /* 737 * We are seriously hosed. Do our best. 738 */ 739 emergency("can't fork single-user shell, trying again"); 740 while (waitpid(-1, NULL, WNOHANG) > 0) 741 continue; 742 return single_user; 743 } 744 745 requested_transition = 0; 746 do { 747 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 748 collect_child(wpid, status); 749 if (wpid == -1) { 750 if (errno == EINTR) 751 continue; 752 warning("wait for single-user shell failed: %m; restarting"); 753 return single_user; 754 } 755 if (wpid == pid && WIFSTOPPED(status)) { 756 warning("init: shell stopped, restarting\n"); 757 kill(pid, SIGCONT); 758 wpid = -1; 759 } 760 } while (wpid != pid && !requested_transition); 761 762 if (requested_transition) 763 return requested_transition; 764 765 if (!WIFEXITED(status)) { 766 if (WTERMSIG(status) == SIGKILL) { 767 /* 768 * reboot(8) killed shell? 769 */ 770 warning("single user shell terminated."); 771 sleep(STALL_TIMEOUT); 772 _exit(0); 773 } else { 774 warning("single user shell terminated, restarting"); 775 return single_user; 776 } 777 } 778 779 runcom_mode = FASTBOOT; 780 return runcom; 781 } 782 783 /* 784 * Run the system startup script. 785 */ 786 static state_t 787 f_runcom(void) 788 { 789 pid_t pid, wpid; 790 int status; 791 const char *argv[4]; 792 struct sigaction sa; 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, NULL); 799 sigaction(SIGHUP, &sa, NULL); 800 801 setctty(_PATH_CONSOLE); 802 803 argv[0] = "sh"; 804 argv[1] = _PATH_RUNCOM; 805 argv[2] = runcom_mode == AUTOBOOT ? "autoboot" : 0; 806 argv[3] = NULL; 807 808 sigprocmask(SIG_SETMASK, &sa.sa_mask, NULL); 809 810 #ifdef LOGIN_CAP 811 setprocresources(RESOURCE_RC); 812 #endif 813 execv(_PATH_BSHELL, __DECONST(char **, argv)); 814 stall("can't exec %s for %s: %m", _PATH_BSHELL, _PATH_RUNCOM); 815 _exit(1); /* force single user mode */ 816 } 817 818 if (pid == -1) { 819 emergency("can't fork for %s on %s: %m", 820 _PATH_BSHELL, _PATH_RUNCOM); 821 while (waitpid(-1, NULL, WNOHANG) > 0) 822 continue; 823 sleep(STALL_TIMEOUT); 824 return single_user; 825 } 826 827 /* 828 * Copied from single_user(). This is a bit paranoid. 829 */ 830 requested_transition = 0; 831 do { 832 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 833 collect_child(wpid, status); 834 if (wpid == -1) { 835 if (requested_transition == death) 836 return death; 837 if (errno == EINTR) 838 continue; 839 warning("wait for %s on %s failed: %m; going to single user mode", 840 _PATH_BSHELL, _PATH_RUNCOM); 841 return single_user; 842 } 843 if (wpid == pid && WIFSTOPPED(status)) { 844 warning("init: %s on %s stopped, restarting\n", 845 _PATH_BSHELL, _PATH_RUNCOM); 846 kill(pid, SIGCONT); 847 wpid = -1; 848 } 849 } while (wpid != pid); 850 851 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGTERM && 852 requested_transition == catatonia) { 853 /* /etc/rc executed /sbin/reboot; wait for the end quietly */ 854 sigset_t s; 855 856 sigfillset(&s); 857 for (;;) 858 sigsuspend(&s); 859 } 860 861 if (!WIFEXITED(status)) { 862 warning("%s on %s terminated abnormally, going to single user mode", 863 _PATH_BSHELL, _PATH_RUNCOM); 864 return single_user; 865 } 866 867 if (WEXITSTATUS(status)) 868 return single_user; 869 870 runcom_mode = AUTOBOOT; /* the default */ 871 logwtmpx("~", "reboot", "", 0, INIT_PROCESS); 872 return read_ttys; 873 } 874 875 /* 876 * Open the session database. 877 * 878 * NB: We could pass in the size here; is it necessary? 879 */ 880 static int 881 start_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)) == NULL) { 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 */ 896 static void 897 add_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 session_utmpx(sp, 1); 910 } 911 912 /* 913 * Delete an old login session. 914 */ 915 static void 916 del_session(session_t *sp) 917 { 918 DBT key; 919 920 key.data = &sp->se_process; 921 key.size = sizeof sp->se_process; 922 923 if ((*session_db->del)(session_db, &key, 0)) 924 emergency("delete %d: %s", sp->se_process, strerror(errno)); 925 session_utmpx(sp, 0); 926 } 927 928 /* 929 * Look up a login session by pid. 930 */ 931 static session_t * 932 find_session(pid_t pid) 933 { 934 DBT key; 935 DBT data; 936 session_t *ret; 937 938 key.data = &pid; 939 key.size = sizeof pid; 940 if ((*session_db->get)(session_db, &key, &data, 0) != 0) 941 return 0; 942 bcopy(data.data, (char *)&ret, sizeof(ret)); 943 return ret; 944 } 945 946 /* 947 * Construct an argument vector from a command line. 948 */ 949 static char ** 950 construct_argv(char *command) 951 { 952 int argc = 0; 953 char **argv = malloc(((strlen(command) + 1) / 2 + 1) 954 * sizeof (char *)); 955 956 if ((argv[argc++] = strk(command)) == NULL) { 957 free(argv); 958 return (NULL); 959 } 960 while ((argv[argc++] = strk(NULL)) != NULL) 961 continue; 962 return argv; 963 } 964 965 /* 966 * Deallocate a session descriptor. 967 */ 968 static void 969 free_session(session_t *sp) 970 { 971 free(sp->se_device); 972 if (sp->se_getty) { 973 free(sp->se_getty); 974 free(sp->se_getty_argv_space); 975 free(sp->se_getty_argv); 976 } 977 if (sp->se_window) { 978 free(sp->se_window); 979 free(sp->se_window_argv_space); 980 free(sp->se_window_argv); 981 } 982 if (sp->se_type) 983 free(sp->se_type); 984 free(sp); 985 } 986 987 static 988 void 989 adjttyent(struct ttyent *typ) 990 { 991 struct stat st; 992 uint32_t rdev; 993 char *devpath; 994 size_t rdev_size = sizeof(rdev); 995 996 if (typ->ty_name == NULL) 997 return; 998 999 /* 1000 * IFCONSOLE option forces tty off if not the console. 1001 */ 1002 if (typ->ty_status & TTY_IFCONSOLE) { 1003 asprintf(&devpath, "%s%s", _PATH_DEV, typ->ty_name); 1004 if (stat(devpath, &st) < 0 || 1005 sysctlbyname("kern.console_rdev", 1006 &rdev, &rdev_size, 1007 NULL, 0) < 0) { 1008 /* device does not exist or no sysctl, disable */ 1009 typ->ty_status &= ~TTY_ON; 1010 } else if (rdev != st.st_rdev) { 1011 typ->ty_status &= ~TTY_ON; 1012 } 1013 free(devpath); 1014 } 1015 } 1016 1017 /* 1018 * Allocate a new session descriptor. 1019 * Mark it SE_PRESENT. 1020 */ 1021 static session_t * 1022 new_session(session_t *sprev, int session_index, struct ttyent *typ) 1023 { 1024 session_t *sp; 1025 int fd; 1026 1027 if (typ->ty_name == NULL || typ->ty_getty == NULL) 1028 return 0; 1029 1030 if ((typ->ty_status & TTY_ON) == 0) 1031 return 0; 1032 1033 sp = (session_t *) calloc(1, sizeof (session_t)); 1034 1035 asprintf(&sp->se_device, "%s%s", _PATH_DEV, typ->ty_name); 1036 sp->se_index = session_index; 1037 sp->se_flags |= SE_PRESENT; 1038 1039 /* 1040 * Attempt to open the device, if we get "device not configured" 1041 * then don't add the device to the session list. 1042 */ 1043 if ((fd = open(sp->se_device, O_RDONLY | O_NONBLOCK, 0)) < 0) { 1044 if (errno == ENXIO) { 1045 free_session(sp); 1046 return (0); 1047 } 1048 } else 1049 close(fd); 1050 1051 if (setupargv(sp, typ) == 0) { 1052 free_session(sp); 1053 return (0); 1054 } 1055 1056 sp->se_next = NULL; 1057 if (sprev == NULL) { 1058 sessions = sp; 1059 sp->se_prev = NULL; 1060 } else { 1061 sprev->se_next = sp; 1062 sp->se_prev = sprev; 1063 } 1064 1065 return sp; 1066 } 1067 1068 /* 1069 * Calculate getty and if useful window argv vectors. 1070 */ 1071 static int 1072 setupargv(session_t *sp, struct ttyent *typ) 1073 { 1074 1075 if (sp->se_getty) { 1076 free(sp->se_getty); 1077 free(sp->se_getty_argv_space); 1078 free(sp->se_getty_argv); 1079 } 1080 sp->se_getty = malloc(strlen(typ->ty_getty) + strlen(typ->ty_name) + 2); 1081 sprintf(sp->se_getty, "%s %s", typ->ty_getty, typ->ty_name); 1082 sp->se_getty_argv_space = strdup(sp->se_getty); 1083 sp->se_getty_argv = construct_argv(sp->se_getty_argv_space); 1084 if (sp->se_getty_argv == NULL) { 1085 warning("can't parse getty for port %s", sp->se_device); 1086 free(sp->se_getty); 1087 free(sp->se_getty_argv_space); 1088 sp->se_getty = sp->se_getty_argv_space = NULL; 1089 return (0); 1090 } 1091 if (sp->se_window) { 1092 free(sp->se_window); 1093 free(sp->se_window_argv_space); 1094 free(sp->se_window_argv); 1095 } 1096 sp->se_window = sp->se_window_argv_space = NULL; 1097 sp->se_window_argv = NULL; 1098 if (typ->ty_window) { 1099 sp->se_window = strdup(typ->ty_window); 1100 sp->se_window_argv_space = strdup(sp->se_window); 1101 sp->se_window_argv = construct_argv(sp->se_window_argv_space); 1102 if (sp->se_window_argv == NULL) { 1103 warning("can't parse window for port %s", 1104 sp->se_device); 1105 free(sp->se_window_argv_space); 1106 free(sp->se_window); 1107 sp->se_window = sp->se_window_argv_space = NULL; 1108 return (0); 1109 } 1110 } 1111 if (sp->se_type) 1112 free(sp->se_type); 1113 sp->se_type = typ->ty_type ? strdup(typ->ty_type) : 0; 1114 return (1); 1115 } 1116 1117 /* 1118 * Walk the list of ttys and create sessions for each active line. 1119 */ 1120 static state_t 1121 f_read_ttys(void) 1122 { 1123 int session_index = 0; 1124 session_t *sp, *snext; 1125 struct ttyent *typ; 1126 1127 if (sessions == NULL) { 1128 struct stat st; 1129 1130 make_utmpx("", BOOT_MSG, BOOT_TIME, 0, &boot_time, 0); 1131 1132 /* 1133 * If wtmpx is not empty, pick the down time from there 1134 */ 1135 if (stat(_PATH_WTMPX, &st) != -1 && st.st_size != 0) { 1136 struct timeval down_time; 1137 1138 TIMESPEC_TO_TIMEVAL(&down_time, 1139 st.st_atime > st.st_mtime ? 1140 &st.st_atimespec : &st.st_mtimespec); 1141 make_utmpx("", DOWN_MSG, DOWN_TIME, 0, &down_time, 0); 1142 } 1143 } 1144 /* 1145 * Destroy any previous session state. 1146 * There shouldn't be any, but just in case... 1147 */ 1148 for (sp = sessions; sp; sp = snext) { 1149 if (sp->se_process) 1150 clear_session_logs(sp, 0); 1151 snext = sp->se_next; 1152 free_session(sp); 1153 } 1154 sessions = NULL; 1155 if (start_session_db()) 1156 return single_user; 1157 1158 /* 1159 * Allocate a session entry for each active port. 1160 * Note that sp starts at 0. 1161 */ 1162 while ((typ = getttyent()) != NULL) { 1163 adjttyent(typ); 1164 if ((snext = new_session(sp, ++session_index, typ)) != NULL) 1165 sp = snext; 1166 } 1167 1168 endttyent(); 1169 1170 return multi_user; 1171 } 1172 1173 /* 1174 * Start a window system running. 1175 */ 1176 static void 1177 start_window_system(session_t *sp) 1178 { 1179 pid_t pid; 1180 sigset_t mask; 1181 char term[64], *env[2]; 1182 1183 if ((pid = fork()) == -1) { 1184 emergency("can't fork for window system on port %s: %m", 1185 sp->se_device); 1186 /* hope that getty fails and we can try again */ 1187 return; 1188 } 1189 1190 if (pid) 1191 return; 1192 1193 sigemptyset(&mask); 1194 sigprocmask(SIG_SETMASK, &mask, NULL); 1195 1196 if (setsid() < 0) 1197 emergency("setsid failed (window) %m"); 1198 1199 #ifdef LOGIN_CAP 1200 setprocresources(RESOURCE_WINDOW); 1201 #endif 1202 if (sp->se_type) { 1203 /* Don't use malloc after fork */ 1204 strcpy(term, "TERM="); 1205 strncat(term, sp->se_type, sizeof(term) - 6); 1206 env[0] = term; 1207 env[1] = NULL; 1208 } 1209 else 1210 env[0] = NULL; 1211 execve(sp->se_window_argv[0], sp->se_window_argv, env); 1212 stall("can't exec window system '%s' for port %s: %m", 1213 sp->se_window_argv[0], sp->se_device); 1214 _exit(1); 1215 } 1216 1217 /* 1218 * Start a login session running. 1219 */ 1220 static pid_t 1221 start_getty(session_t *sp) 1222 { 1223 pid_t pid; 1224 sigset_t mask; 1225 time_t current_time = time(NULL); 1226 int too_quick = 0; 1227 char term[64], *env[2]; 1228 1229 if (current_time >= sp->se_started.tv_sec && 1230 current_time - sp->se_started.tv_sec < GETTY_SPACING) { 1231 if (++sp->se_nspace > GETTY_NSPACE) { 1232 sp->se_nspace = 0; 1233 too_quick = 1; 1234 } 1235 } else 1236 sp->se_nspace = 0; 1237 1238 /* 1239 * fork(), not vfork() -- we can't afford to block. 1240 */ 1241 if ((pid = fork()) == -1) { 1242 emergency("can't fork for getty on port %s: %m", sp->se_device); 1243 return -1; 1244 } 1245 1246 if (pid) 1247 return pid; 1248 1249 if (too_quick) { 1250 warning("getty repeating too quickly on port %s, sleeping %d secs", 1251 sp->se_device, GETTY_SLEEP); 1252 sleep((unsigned) GETTY_SLEEP); 1253 } 1254 1255 if (sp->se_window) { 1256 start_window_system(sp); 1257 sleep(WINDOW_WAIT); 1258 } 1259 1260 sigemptyset(&mask); 1261 sigprocmask(SIG_SETMASK, &mask, NULL); 1262 1263 #ifdef LOGIN_CAP 1264 setprocresources(RESOURCE_GETTY); 1265 #endif 1266 if (sp->se_type) { 1267 /* Don't use malloc after fork */ 1268 strcpy(term, "TERM="); 1269 strncat(term, sp->se_type, sizeof(term) - 6); 1270 env[0] = term; 1271 env[1] = NULL; 1272 } 1273 else 1274 env[0] = NULL; 1275 execve(sp->se_getty_argv[0], sp->se_getty_argv, env); 1276 stall("can't exec getty '%s' for port %s: %m", 1277 sp->se_getty_argv[0], sp->se_device); 1278 _exit(1); 1279 } 1280 1281 /* 1282 * Collect exit status for a child. 1283 * If an exiting login, start a new login running. 1284 */ 1285 static void 1286 collect_child(pid_t pid, int status) 1287 { 1288 session_t *sp, *sprev, *snext; 1289 1290 if (! sessions) 1291 return; 1292 1293 if (! (sp = find_session(pid))) 1294 return; 1295 1296 clear_session_logs(sp, status); 1297 del_session(sp); 1298 sp->se_process = 0; 1299 1300 if (sp->se_flags & SE_SHUTDOWN) { 1301 if ((sprev = sp->se_prev) != NULL) 1302 sprev->se_next = sp->se_next; 1303 else 1304 sessions = sp->se_next; 1305 if ((snext = sp->se_next) != NULL) 1306 snext->se_prev = sp->se_prev; 1307 free_session(sp); 1308 return; 1309 } 1310 1311 if ((pid = start_getty(sp)) == -1) { 1312 /* serious trouble */ 1313 requested_transition = clean_ttys; 1314 return; 1315 } 1316 1317 sp->se_process = pid; 1318 gettimeofday(&sp->se_started, NULL); 1319 add_session(sp); 1320 } 1321 1322 /* 1323 * Catch a signal and request a state transition. 1324 */ 1325 static void 1326 transition_handler(int sig) 1327 { 1328 1329 switch (sig) { 1330 case SIGHUP: 1331 requested_transition = clean_ttys; 1332 break; 1333 case SIGUSR2: 1334 howto = RB_POWEROFF; 1335 /* FALLTHROUGH */ 1336 case SIGUSR1: 1337 howto |= RB_HALT; 1338 /* FALLTHROUGH */ 1339 case SIGINT: 1340 Reboot = TRUE; 1341 /* FALLTHROUGH */ 1342 case SIGTERM: 1343 requested_transition = death; 1344 break; 1345 case SIGTSTP: 1346 requested_transition = catatonia; 1347 break; 1348 default: 1349 requested_transition = 0; 1350 break; 1351 } 1352 } 1353 1354 /* 1355 * Take the system multiuser. 1356 */ 1357 static state_t 1358 f_multi_user(void) 1359 { 1360 pid_t pid; 1361 int status; 1362 session_t *sp; 1363 1364 requested_transition = 0; 1365 1366 /* 1367 * If the administrator has not set the security level to -1 1368 * to indicate that the kernel should not run multiuser in secure 1369 * mode, and the run script has not set a higher level of security 1370 * than level 1, then put the kernel into secure mode. 1371 */ 1372 if (getsecuritylevel() == 0) 1373 setsecuritylevel(1); 1374 1375 for (sp = sessions; sp; sp = sp->se_next) { 1376 if (sp->se_process) 1377 continue; 1378 if ((pid = start_getty(sp)) == -1) { 1379 /* serious trouble */ 1380 requested_transition = clean_ttys; 1381 break; 1382 } 1383 sp->se_process = pid; 1384 gettimeofday(&sp->se_started, NULL); 1385 add_session(sp); 1386 } 1387 1388 while (!requested_transition) 1389 if ((pid = waitpid(-1, &status, 0)) != -1) 1390 collect_child(pid, status); 1391 1392 return requested_transition; 1393 } 1394 1395 /* 1396 * This is an (n*2)+(n^2) algorithm. We hope it isn't run often... 1397 */ 1398 static state_t 1399 f_clean_ttys(void) 1400 { 1401 session_t *sp, *sprev; 1402 struct ttyent *typ; 1403 int session_index = 0; 1404 int devlen; 1405 char *old_getty, *old_window, *old_type; 1406 1407 if (! sessions) 1408 return multi_user; 1409 1410 /* 1411 * mark all sessions for death, (!SE_PRESENT) 1412 * as we find or create new ones they'll be marked as keepers, 1413 * we'll later nuke all the ones not found in /etc/ttys 1414 */ 1415 for (sp = sessions; sp != NULL; sp = sp->se_next) 1416 sp->se_flags &= ~SE_PRESENT; 1417 1418 devlen = sizeof(_PATH_DEV) - 1; 1419 while ((typ = getttyent()) != NULL) { 1420 ++session_index; 1421 1422 adjttyent(typ); 1423 for (sprev = NULL, sp = sessions; sp; sprev = sp, sp = sp->se_next) 1424 if (strcmp(typ->ty_name, sp->se_device + devlen) == 0) 1425 break; 1426 1427 if (sp) { 1428 /* we want this one to live */ 1429 sp->se_flags |= SE_PRESENT; 1430 if (sp->se_index != session_index) { 1431 warning("port %s changed utmpx index from %d to %d", 1432 sp->se_device, sp->se_index, 1433 session_index); 1434 sp->se_index = session_index; 1435 } 1436 if ((typ->ty_status & TTY_ON) == 0 || 1437 typ->ty_getty == 0) { 1438 sp->se_flags |= SE_SHUTDOWN; 1439 kill(sp->se_process, SIGHUP); 1440 continue; 1441 } 1442 sp->se_flags &= ~SE_SHUTDOWN; 1443 old_getty = sp->se_getty ? strdup(sp->se_getty) : 0; 1444 old_window = sp->se_window ? strdup(sp->se_window) : 0; 1445 old_type = sp->se_type ? strdup(sp->se_type) : 0; 1446 if (setupargv(sp, typ) == 0) { 1447 warning("can't parse getty for port %s", 1448 sp->se_device); 1449 sp->se_flags |= SE_SHUTDOWN; 1450 kill(sp->se_process, SIGHUP); 1451 } 1452 else if ( !old_getty 1453 || (!old_type && sp->se_type) 1454 || (old_type && !sp->se_type) 1455 || (!old_window && sp->se_window) 1456 || (old_window && !sp->se_window) 1457 || (strcmp(old_getty, sp->se_getty) != 0) 1458 || (old_window && strcmp(old_window, sp->se_window) != 0) 1459 || (old_type && strcmp(old_type, sp->se_type) != 0) 1460 ) { 1461 /* Don't set SE_SHUTDOWN here */ 1462 sp->se_nspace = 0; 1463 sp->se_started.tv_sec = sp->se_started.tv_usec = 0; 1464 kill(sp->se_process, SIGHUP); 1465 } 1466 if (old_getty) 1467 free(old_getty); 1468 if (old_window) 1469 free(old_window); 1470 if (old_type) 1471 free(old_type); 1472 continue; 1473 } 1474 1475 new_session(sprev, session_index, typ); 1476 } 1477 1478 endttyent(); 1479 1480 /* 1481 * sweep through and kill all deleted sessions 1482 * ones who's /etc/ttys line was deleted (SE_PRESENT unset) 1483 */ 1484 for (sp = sessions; sp != NULL; sp = sp->se_next) { 1485 if ((sp->se_flags & SE_PRESENT) == 0) { 1486 sp->se_flags |= SE_SHUTDOWN; 1487 kill(sp->se_process, SIGHUP); 1488 } 1489 } 1490 1491 return multi_user; 1492 } 1493 1494 /* 1495 * Block further logins. 1496 */ 1497 static state_t 1498 f_catatonia(void) 1499 { 1500 session_t *sp; 1501 1502 for (sp = sessions; sp; sp = sp->se_next) 1503 sp->se_flags |= SE_SHUTDOWN; 1504 1505 return multi_user; 1506 } 1507 1508 /* 1509 * Note SIGALRM. 1510 */ 1511 static void 1512 alrm_handler(int sig __unused) 1513 { 1514 clang = 1; 1515 } 1516 1517 /* 1518 * Bring the system down to single user. 1519 */ 1520 static state_t 1521 f_death(void) 1522 { 1523 session_t *sp; 1524 int i; 1525 pid_t pid; 1526 int status; 1527 static const int death_sigs[2] = { SIGTERM, SIGKILL }; 1528 1529 logwtmpx("~", "shutdown", "", 0, INIT_PROCESS); 1530 1531 for (sp = sessions; sp; sp = sp->se_next) { 1532 sp->se_flags |= SE_SHUTDOWN; 1533 kill(sp->se_process, SIGHUP); 1534 } 1535 1536 /* Try to run the rc.shutdown script within a period of time */ 1537 runshutdown(); 1538 1539 for (i = 0; i < 2; ++i) { 1540 if (kill(-1, death_sigs[i]) == -1 && errno == ESRCH) 1541 return single_user; 1542 1543 clang = 0; 1544 alarm(DEATH_WATCH); 1545 do 1546 if ((pid = waitpid(-1, &status, 0)) != -1) 1547 collect_child(pid, status); 1548 while (clang == 0 && errno != ECHILD); 1549 1550 if (errno == ECHILD) 1551 return single_user; 1552 } 1553 1554 warning("some processes would not die; ps axl advised"); 1555 1556 return single_user; 1557 } 1558 1559 /* 1560 * Run the system shutdown script. 1561 * 1562 * Exit codes: XXX I should document more 1563 * -2 shutdown script terminated abnormally 1564 * -1 fatal error - can't run script 1565 * 0 good. 1566 * >0 some error (exit code) 1567 */ 1568 static int 1569 runshutdown(void) 1570 { 1571 pid_t pid, wpid; 1572 int status; 1573 int shutdowntimeout; 1574 size_t len; 1575 const char *argv[4]; 1576 struct sigaction sa; 1577 struct stat sb; 1578 1579 /* 1580 * rc.shutdown is optional, so to prevent any unnecessary 1581 * complaints from the shell we simply don't run it if the 1582 * file does not exist. If the stat() here fails for other 1583 * reasons, we'll let the shell complain. 1584 */ 1585 if (stat(_PATH_RUNDOWN, &sb) == -1 && errno == ENOENT) 1586 return 0; 1587 1588 if ((pid = fork()) == 0) { 1589 int fd; 1590 1591 /* Assume that init already grab console as ctty before */ 1592 1593 sigemptyset(&sa.sa_mask); 1594 sa.sa_flags = 0; 1595 sa.sa_handler = SIG_IGN; 1596 sigaction(SIGTSTP, &sa, NULL); 1597 sigaction(SIGHUP, &sa, NULL); 1598 1599 if ((fd = open(_PATH_CONSOLE, O_RDWR)) == -1) 1600 warning("can't open %s: %m", _PATH_CONSOLE); 1601 else { 1602 dup2(fd, 0); 1603 dup2(fd, 1); 1604 dup2(fd, 2); 1605 if (fd > 2) 1606 close(fd); 1607 } 1608 1609 /* 1610 * Run the shutdown script. 1611 */ 1612 argv[0] = "sh"; 1613 argv[1] = _PATH_RUNDOWN; 1614 if (Reboot) 1615 argv[2] = "reboot"; 1616 else 1617 argv[2] = "single"; 1618 argv[3] = NULL; 1619 1620 sigprocmask(SIG_SETMASK, &sa.sa_mask, NULL); 1621 1622 #ifdef LOGIN_CAP 1623 setprocresources(RESOURCE_RC); 1624 #endif 1625 execv(_PATH_BSHELL, __DECONST(char **, argv)); 1626 warning("can't exec %s for %s: %m", _PATH_BSHELL, _PATH_RUNDOWN); 1627 _exit(1); /* force single user mode */ 1628 } 1629 1630 if (pid == -1) { 1631 emergency("can't fork for %s on %s: %m", 1632 _PATH_BSHELL, _PATH_RUNDOWN); 1633 while (waitpid(-1, NULL, WNOHANG) > 0) 1634 continue; 1635 sleep(STALL_TIMEOUT); 1636 return -1; 1637 } 1638 1639 len = sizeof(shutdowntimeout); 1640 if (sysctlbyname("kern.init_shutdown_timeout", 1641 &shutdowntimeout, 1642 &len, NULL, 0) == -1 || shutdowntimeout < 2) 1643 shutdowntimeout = DEATH_SCRIPT; 1644 alarm(shutdowntimeout); 1645 clang = 0; 1646 /* 1647 * Copied from single_user(). This is a bit paranoid. 1648 * Use the same ALRM handler. 1649 */ 1650 do { 1651 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 1652 collect_child(wpid, status); 1653 if (clang == 1) { 1654 /* we were waiting for the sub-shell */ 1655 kill(wpid, SIGTERM); 1656 warning("timeout expired for %s on %s: %m; going to single user mode", 1657 _PATH_BSHELL, _PATH_RUNDOWN); 1658 return -1; 1659 } 1660 if (wpid == -1) { 1661 if (errno == EINTR) 1662 continue; 1663 warning("wait for %s on %s failed: %m; going to single user mode", 1664 _PATH_BSHELL, _PATH_RUNDOWN); 1665 return -1; 1666 } 1667 if (wpid == pid && WIFSTOPPED(status)) { 1668 warning("init: %s on %s stopped, restarting\n", 1669 _PATH_BSHELL, _PATH_RUNDOWN); 1670 kill(pid, SIGCONT); 1671 wpid = -1; 1672 } 1673 } while (wpid != pid && !clang); 1674 1675 /* Turn off the alarm */ 1676 alarm(0); 1677 1678 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGTERM && 1679 requested_transition == catatonia) { 1680 /* 1681 * /etc/rc.shutdown executed /sbin/reboot; 1682 * wait for the end quietly 1683 */ 1684 sigset_t s; 1685 1686 sigfillset(&s); 1687 for (;;) 1688 sigsuspend(&s); 1689 } 1690 1691 if (!WIFEXITED(status)) { 1692 warning("%s on %s terminated abnormally, going to single user mode", 1693 _PATH_BSHELL, _PATH_RUNDOWN); 1694 return -2; 1695 } 1696 1697 if ((status = WEXITSTATUS(status)) != 0) 1698 warning("%s returned status %d", _PATH_RUNDOWN, status); 1699 1700 return status; 1701 } 1702 1703 static char * 1704 strk(char *p) 1705 { 1706 static char *t; 1707 char *q; 1708 int c; 1709 1710 if (p) 1711 t = p; 1712 if (!t) 1713 return 0; 1714 1715 c = *t; 1716 while (c == ' ' || c == '\t' ) 1717 c = *++t; 1718 if (!c) { 1719 t = NULL; 1720 return 0; 1721 } 1722 q = t; 1723 if (c == '\'') { 1724 c = *++t; 1725 q = t; 1726 while (c && c != '\'') 1727 c = *++t; 1728 if (!c) /* unterminated string */ 1729 q = t = NULL; 1730 else 1731 *t++ = 0; 1732 } else { 1733 while (c && c != ' ' && c != '\t' ) 1734 c = *++t; 1735 *t++ = 0; 1736 if (!c) 1737 t = NULL; 1738 } 1739 return q; 1740 } 1741 1742 #ifdef LOGIN_CAP 1743 static void 1744 setprocresources(const char *cname) 1745 { 1746 login_cap_t *lc; 1747 if ((lc = login_getclassbyname(cname, NULL)) != NULL) { 1748 setusercontext(lc, NULL, 0, LOGIN_SETPRIORITY|LOGIN_SETRESOURCES); 1749 login_close(lc); 1750 } 1751 } 1752 #endif 1753 1754 static void 1755 session_utmpx(const session_t *sp, int add) 1756 { 1757 const char *name = sp->se_getty ? sp->se_getty : 1758 (sp->se_window ? sp->se_window : ""); 1759 const char *line = sp->se_device + sizeof(_PATH_DEV) - 1; 1760 1761 make_utmpx(name, line, add ? LOGIN_PROCESS : DEAD_PROCESS, 1762 sp->se_process, &sp->se_started, sp->se_index); 1763 } 1764 1765 static void 1766 make_utmpx(const char *name, const char *line, int type, pid_t pid, 1767 const struct timeval *tv, int session) 1768 { 1769 struct utmpx ut; 1770 const char *eline; 1771 1772 (void)memset(&ut, 0, sizeof(ut)); 1773 (void)strlcpy(ut.ut_name, name, sizeof(ut.ut_name)); 1774 ut.ut_type = type; 1775 (void)strlcpy(ut.ut_line, line, sizeof(ut.ut_line)); 1776 ut.ut_pid = pid; 1777 if (tv) 1778 ut.ut_tv = *tv; 1779 else 1780 (void)gettimeofday(&ut.ut_tv, NULL); 1781 ut.ut_session = session; 1782 1783 eline = line + strlen(line); 1784 if ((size_t)(eline - line) >= sizeof(ut.ut_id)) 1785 line = eline - sizeof(ut.ut_id); 1786 (void)strncpy(ut.ut_id, line, sizeof(ut.ut_id)); 1787 1788 if (pututxline(&ut) == NULL) 1789 warning("can't add utmpx record for `%s': %m", ut.ut_line); 1790 endutxent(); 1791 } 1792 1793 static char 1794 get_runlevel(const state_t s) 1795 { 1796 if (s == single_user) 1797 return SINGLE_USER; 1798 if (s == runcom) 1799 return RUNCOM; 1800 if (s == read_ttys) 1801 return READ_TTYS; 1802 if (s == multi_user) 1803 return MULTI_USER; 1804 if (s == clean_ttys) 1805 return CLEAN_TTYS; 1806 if (s == catatonia) 1807 return CATATONIA; 1808 return DEATH; 1809 } 1810 1811 static void 1812 utmpx_set_runlevel(char old, char new) 1813 { 1814 struct utmpx ut; 1815 1816 /* 1817 * Don't record any transitions until we did the first transition 1818 * to read ttys, which is when we are guaranteed to have a read-write 1819 * /var. Perhaps use a different variable for this? 1820 */ 1821 if (sessions == NULL) 1822 return; 1823 1824 (void)memset(&ut, 0, sizeof(ut)); 1825 (void)snprintf(ut.ut_line, sizeof(ut.ut_line), RUNLVL_MSG, new); 1826 ut.ut_type = RUN_LVL; 1827 (void)gettimeofday(&ut.ut_tv, NULL); 1828 ut.ut_exit.e_exit = old; 1829 ut.ut_exit.e_termination = new; 1830 if (pututxline(&ut) == NULL) 1831 warning("can't add utmpx record for `runlevel': %m"); 1832 endutxent(); 1833 } 1834