1 /* $NetBSD: init.c,v 1.100 2009/12/29 17:07:17 elad Exp $ */ 2 3 /*- 4 * Copyright (c) 1991, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Donn Seeley at Berkeley Software Design, Inc. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #ifndef lint 37 __COPYRIGHT("@(#) Copyright (c) 1991, 1993\ 38 The Regents of the University of California. All rights reserved."); 39 #endif /* not lint */ 40 41 #ifndef lint 42 #if 0 43 static char sccsid[] = "@(#)init.c 8.2 (Berkeley) 4/28/95"; 44 #else 45 __RCSID("$NetBSD: init.c,v 1.100 2009/12/29 17:07:17 elad Exp $"); 46 #endif 47 #endif /* not lint */ 48 49 #include <sys/param.h> 50 #include <sys/sysctl.h> 51 #include <sys/wait.h> 52 #include <sys/mman.h> 53 #include <sys/stat.h> 54 #include <sys/mount.h> 55 #include <machine/cpu.h> 56 57 #include <db.h> 58 #include <errno.h> 59 #include <fcntl.h> 60 #include <signal.h> 61 #include <stdio.h> 62 #include <stdlib.h> 63 #include <string.h> 64 #include <syslog.h> 65 #include <time.h> 66 #include <ttyent.h> 67 #include <unistd.h> 68 #include <util.h> 69 #include <paths.h> 70 #include <err.h> 71 72 #include <stdarg.h> 73 74 #ifdef SECURE 75 #include <pwd.h> 76 #endif 77 78 #include "pathnames.h" 79 80 #define XSTR(x) #x 81 #define STR(x) XSTR(x) 82 83 /* 84 * Sleep times; used to prevent thrashing. 85 */ 86 #define GETTY_SPACING 5 /* N secs minimum getty spacing */ 87 #define GETTY_SLEEP 30 /* sleep N secs after spacing problem */ 88 #define WINDOW_WAIT 3 /* wait N secs after starting window */ 89 #define STALL_TIMEOUT 30 /* wait N secs after warning */ 90 #define DEATH_WATCH 10 /* wait N secs for procs to die */ 91 92 const struct timespec dtrtime = {.tv_sec = 0, .tv_nsec = 250000}; 93 94 #if defined(RESCUEDIR) 95 #define INIT_BSHELL RESCUEDIR "/sh" 96 #define INIT_MOUNT_MFS RESCUEDIR "/mount_mfs" 97 #define INIT_PATH RESCUEDIR ":" _PATH_STDPATH 98 #else 99 #define INIT_BSHELL _PATH_BSHELL 100 #define INIT_MOUNT_MFS "/sbin/mount_mfs" 101 #define INIT_PATH _PATH_STDPATH 102 #endif 103 104 int main(int, char *[]); 105 106 void handle(sig_t, ...); 107 void delset(sigset_t *, ...); 108 109 void stall(const char *, ...) 110 __attribute__((__format__(__printf__,1,2))); 111 void warning(const char *, ...) 112 __attribute__((__format__(__printf__,1,2))); 113 void emergency(const char *, ...) 114 __attribute__((__format__(__printf__,1,2))); 115 void disaster(int); 116 void badsys(int); 117 118 /* 119 * We really need a recursive typedef... 120 * The following at least guarantees that the return type of (*state_t)() 121 * is sufficiently wide to hold a function pointer. 122 */ 123 typedef long (*state_func_t)(void); 124 typedef state_func_t (*state_t)(void); 125 126 #define DEATH 'd' 127 #define SINGLE_USER 's' 128 #define RUNCOM 'r' 129 #define READ_TTYS 't' 130 #define MULTI_USER 'm' 131 #define CLEAN_TTYS 'T' 132 #define CATATONIA 'c' 133 134 state_func_t single_user(void); 135 state_func_t runcom(void); 136 state_func_t read_ttys(void); 137 state_func_t multi_user(void); 138 state_func_t clean_ttys(void); 139 state_func_t catatonia(void); 140 state_func_t death(void); 141 142 enum { AUTOBOOT, FASTBOOT } runcom_mode = AUTOBOOT; 143 144 void transition(state_t); 145 void setctty(const char *); 146 147 typedef struct init_session { 148 int se_index; /* index of entry in ttys file */ 149 pid_t se_process; /* controlling process */ 150 struct timeval se_started; /* used to avoid thrashing */ 151 int se_flags; /* status of session */ 152 #define SE_SHUTDOWN 0x1 /* session won't be restarted */ 153 #define SE_PRESENT 0x2 /* session is in /etc/ttys */ 154 char *se_device; /* filename of port */ 155 char *se_getty; /* what to run on that port */ 156 char **se_getty_argv; /* pre-parsed argument array */ 157 char *se_window; /* window system (started only once) */ 158 char **se_window_argv; /* pre-parsed argument array */ 159 struct init_session *se_prev; 160 struct init_session *se_next; 161 } session_t; 162 163 void free_session(session_t *); 164 session_t *new_session(session_t *, int, struct ttyent *); 165 session_t *sessions; 166 167 char **construct_argv(char *); 168 void start_window_system(session_t *); 169 void collect_child(pid_t, int); 170 pid_t start_getty(session_t *); 171 void transition_handler(int); 172 void alrm_handler(int); 173 int has_securelevel(void); 174 void setsecuritylevel(int); 175 int getsecuritylevel(void); 176 int securelevel_present; 177 int setupargv(session_t *, struct ttyent *); 178 int clang; 179 180 int start_session_db(void); 181 void add_session(session_t *); 182 void del_session(session_t *); 183 session_t *find_session(pid_t); 184 DB *session_db; 185 186 int do_setttyent(void); 187 188 #ifndef LETS_GET_SMALL 189 state_t requested_transition = runcom; 190 191 void clear_session_logs(session_t *, int); 192 state_func_t runetcrc(int); 193 #ifdef SUPPORT_UTMPX 194 static struct timeval boot_time; 195 state_t current_state = death; 196 static void session_utmpx(const session_t *, int); 197 static void make_utmpx(const char *, const char *, int, pid_t, 198 const struct timeval *, int); 199 static char get_runlevel(const state_t); 200 static void utmpx_set_runlevel(char, char); 201 #endif 202 203 #ifdef CHROOT 204 int did_multiuser_chroot = 0; 205 char rootdir[PATH_MAX]; 206 int shouldchroot(void); 207 int createsysctlnode(void); 208 #endif /* CHROOT */ 209 210 #else /* LETS_GET_SMALL */ 211 state_t requested_transition = single_user; 212 #endif /* !LETS_GET_SMALL */ 213 214 #ifdef MFS_DEV_IF_NO_CONSOLE 215 216 static int mfs_dev(void); 217 218 #endif 219 220 /* 221 * The mother of all processes. 222 */ 223 int 224 main(int argc, char **argv) 225 { 226 struct sigaction sa; 227 sigset_t mask; 228 #ifndef LETS_GET_SMALL 229 int c; 230 231 #ifdef SUPPORT_UTMPX 232 (void)gettimeofday(&boot_time, NULL); 233 #endif /* SUPPORT_UTMPX */ 234 235 /* Dispose of random users. */ 236 if (getuid() != 0) { 237 errno = EPERM; 238 err(1, NULL); 239 } 240 241 /* System V users like to reexec init. */ 242 if (getpid() != 1) 243 errx(1, "already running"); 244 #endif 245 246 /* 247 * Create an initial session. 248 */ 249 if (setsid() < 0) 250 warn("initial setsid() failed"); 251 252 /* 253 * Establish an initial user so that programs running 254 * single user do not freak out and die (like passwd). 255 */ 256 if (setlogin("root") < 0) 257 warn("setlogin() failed"); 258 259 260 #ifdef MFS_DEV_IF_NO_CONSOLE 261 if (mfs_dev() == -1) 262 requested_transition = single_user; 263 #endif 264 265 #ifndef LETS_GET_SMALL 266 /* 267 * Note that this does NOT open a file... 268 * Does 'init' deserve its own facility number? 269 */ 270 openlog("init", LOG_CONS, LOG_AUTH); 271 #endif /* LETS_GET_SMALL */ 272 273 274 #ifndef LETS_GET_SMALL 275 /* 276 * This code assumes that we always get arguments through flags, 277 * never through bits set in some random machine register. 278 */ 279 while ((c = getopt(argc, argv, "sf")) != -1) 280 switch (c) { 281 case 's': 282 requested_transition = single_user; 283 break; 284 case 'f': 285 runcom_mode = FASTBOOT; 286 break; 287 default: 288 warning("unrecognized flag `%c'", c); 289 break; 290 } 291 292 if (optind != argc) 293 warning("ignoring excess arguments"); 294 #else /* LETS_GET_SMALL */ 295 requested_transition = single_user; 296 #endif /* LETS_GET_SMALL */ 297 298 /* 299 * We catch or block signals rather than ignore them, 300 * so that they get reset on exec. 301 */ 302 handle(badsys, SIGSYS, 0); 303 handle(disaster, SIGABRT, SIGFPE, SIGILL, SIGSEGV, 304 SIGBUS, SIGXCPU, SIGXFSZ, 0); 305 handle(transition_handler, SIGHUP, SIGTERM, SIGTSTP, 0); 306 handle(alrm_handler, SIGALRM, 0); 307 (void)sigfillset(&mask); 308 delset(&mask, SIGABRT, SIGFPE, SIGILL, SIGSEGV, SIGBUS, SIGSYS, 309 SIGXCPU, SIGXFSZ, SIGHUP, SIGTERM, SIGTSTP, SIGALRM, 0); 310 (void)sigprocmask(SIG_SETMASK, &mask, NULL); 311 (void)sigemptyset(&sa.sa_mask); 312 sa.sa_flags = 0; 313 sa.sa_handler = SIG_IGN; 314 (void)sigaction(SIGTTIN, &sa, NULL); 315 (void)sigaction(SIGTTOU, &sa, NULL); 316 317 /* 318 * Paranoia. 319 */ 320 (void)close(0); 321 (void)close(1); 322 (void)close(2); 323 324 #if !defined(LETS_GET_SMALL) && defined(CHROOT) 325 /* Create "init.root" sysctl node. */ 326 (void)createsysctlnode(); 327 #endif /* !LETS_GET_SMALL && CHROOT*/ 328 329 /* 330 * Securelevel might not be supported by the kernel. Query for it, and 331 * set a variable indicating whether we should attempt anything with it 332 * or not. 333 */ 334 securelevel_present = has_securelevel(); 335 336 /* 337 * Start the state machine. 338 */ 339 transition(requested_transition); 340 341 /* 342 * Should never reach here. 343 */ 344 return 1; 345 } 346 347 /* 348 * Associate a function with a signal handler. 349 */ 350 void 351 handle(sig_t handler, ...) 352 { 353 int sig; 354 struct sigaction sa; 355 sigset_t mask_everything; 356 va_list ap; 357 358 va_start(ap, handler); 359 360 sa.sa_handler = handler; 361 (void)sigfillset(&mask_everything); 362 363 while ((sig = va_arg(ap, int)) != 0) { 364 sa.sa_mask = mask_everything; 365 /* XXX SA_RESTART? */ 366 sa.sa_flags = sig == SIGCHLD ? SA_NOCLDSTOP : 0; 367 (void)sigaction(sig, &sa, NULL); 368 } 369 va_end(ap); 370 } 371 372 /* 373 * Delete a set of signals from a mask. 374 */ 375 void 376 delset(sigset_t *maskp, ...) 377 { 378 int sig; 379 va_list ap; 380 381 va_start(ap, maskp); 382 383 while ((sig = va_arg(ap, int)) != 0) 384 (void)sigdelset(maskp, sig); 385 va_end(ap); 386 } 387 388 #if 0 /* Enable to get error messages from init ! */ 389 #define vsyslog(level, fmt, ap) print_console(level, fmt, ap) 390 #define closelog() 391 392 static void 393 print_console(int level, const char *message, va_list ap) 394 { 395 /* 396 * XXX: syslog seems to just plain not work in console-only 397 * XXX: situation... that should be fixed. Let's leave this 398 * XXX: note + code here in case someone gets in trouble and 399 * XXX: wants to debug. -- Jachym Holecek <freza@liberouter.org> 400 */ 401 char errbuf[1024]; 402 int fd, len; 403 404 /* We can't do anything on errors, anyway... */ 405 fd = open(_PATH_CONSOLE, O_WRONLY); 406 if (fd == -1) 407 return ; 408 409 /* %m will get lost... */ 410 len = vsnprintf(errbuf, sizeof(errbuf), message, ap); 411 (void)write(fd, (void *)errbuf, len); 412 (void)close(fd); 413 } 414 #endif 415 416 /* 417 * Log a message and sleep for a while (to give someone an opportunity 418 * to read it and to save log or hardcopy output if the problem is chronic). 419 * NB: should send a message to the session logger to avoid blocking. 420 */ 421 void 422 stall(const char *message, ...) 423 { 424 va_list ap; 425 426 va_start(ap, message); 427 vsyslog(LOG_ALERT, message, ap); 428 va_end(ap); 429 closelog(); 430 (void)sleep(STALL_TIMEOUT); 431 } 432 433 /* 434 * Like stall(), but doesn't sleep. 435 * If cpp had variadic macros, the two functions could be #defines for another. 436 * NB: should send a message to the session logger to avoid blocking. 437 */ 438 void 439 warning(const char *message, ...) 440 { 441 va_list ap; 442 443 va_start(ap, message); 444 vsyslog(LOG_ALERT, message, ap); 445 va_end(ap); 446 closelog(); 447 } 448 449 /* 450 * Log an emergency message. 451 * NB: should send a message to the session logger to avoid blocking. 452 */ 453 void 454 emergency(const char *message, ...) 455 { 456 va_list ap; 457 458 va_start(ap, message); 459 vsyslog(LOG_EMERG, message, ap); 460 va_end(ap); 461 closelog(); 462 } 463 464 /* 465 * Catch a SIGSYS signal. 466 * 467 * These may arise if a system does not support sysctl. 468 * We tolerate up to 25 of these, then throw in the towel. 469 */ 470 void 471 badsys(int sig) 472 { 473 static int badcount = 0; 474 475 if (badcount++ < 25) 476 return; 477 disaster(sig); 478 } 479 480 /* 481 * Catch an unexpected signal. 482 */ 483 void 484 disaster(int sig) 485 { 486 487 emergency("fatal signal: %s", strsignal(sig)); 488 (void)sleep(STALL_TIMEOUT); 489 _exit(sig); /* reboot */ 490 } 491 492 /* 493 * Check if securelevel is present. 494 */ 495 int 496 has_securelevel(void) 497 { 498 #ifdef KERN_SECURELVL 499 int name[2], curlevel; 500 size_t len; 501 502 name[0] = CTL_KERN; 503 name[1] = KERN_SECURELVL; 504 len = sizeof curlevel; 505 if (sysctl(name, 2, &curlevel, &len, NULL, 0) == -1) { 506 /* If it doesn't exist, it's okay. */ 507 if (errno == ENOENT) 508 return 0; 509 } 510 return 1; 511 #else 512 return 0; 513 #endif 514 } 515 516 /* 517 * Get the security level of the kernel. 518 */ 519 int 520 getsecuritylevel(void) 521 { 522 #ifdef KERN_SECURELVL 523 int name[2], curlevel; 524 size_t len; 525 526 if (!securelevel_present) 527 return -1; 528 529 name[0] = CTL_KERN; 530 name[1] = KERN_SECURELVL; 531 len = sizeof curlevel; 532 if (sysctl(name, 2, &curlevel, &len, NULL, 0) == -1) { 533 emergency("cannot get kernel security level: %m"); 534 return -1; 535 } 536 return curlevel; 537 #else 538 return -1; 539 #endif 540 } 541 542 /* 543 * Set the security level of the kernel. 544 */ 545 void 546 setsecuritylevel(int newlevel) 547 { 548 #ifdef KERN_SECURELVL 549 int name[2], curlevel; 550 551 if (!securelevel_present) 552 return; 553 554 curlevel = getsecuritylevel(); 555 if (newlevel == curlevel) 556 return; 557 name[0] = CTL_KERN; 558 name[1] = KERN_SECURELVL; 559 if (sysctl(name, 2, NULL, NULL, &newlevel, sizeof newlevel) == -1) { 560 emergency("cannot change kernel security level from" 561 " %d to %d: %m", curlevel, newlevel); 562 return; 563 } 564 #ifdef SECURE 565 warning("kernel security level changed from %d to %d", 566 curlevel, newlevel); 567 #endif 568 #endif 569 } 570 571 /* 572 * Change states in the finite state machine. 573 * The initial state is passed as an argument. 574 */ 575 void 576 transition(state_t s) 577 { 578 579 if (s == NULL) 580 return; 581 for (;;) { 582 #ifdef SUPPORT_UTMPX 583 #ifndef LETS_GET_SMALL 584 utmpx_set_runlevel(get_runlevel(current_state), 585 get_runlevel(s)); 586 current_state = s; 587 #endif 588 #endif 589 s = (state_t)(*s)(); 590 } 591 } 592 593 #ifndef LETS_GET_SMALL 594 /* 595 * Close out the accounting files for a login session. 596 * NB: should send a message to the session logger to avoid blocking. 597 */ 598 void 599 clear_session_logs(session_t *sp, int status) 600 { 601 #if defined(SUPPORT_UTMP) || defined(SUPPORT_UTMPX) 602 char *line = sp->se_device + sizeof(_PATH_DEV) - 1; 603 #endif 604 605 #ifdef SUPPORT_UTMPX 606 if (logoutx(line, status, DEAD_PROCESS)) 607 logwtmpx(line, "", "", status, DEAD_PROCESS); 608 #endif 609 #ifdef SUPPORT_UTMP 610 if (logout(line)) 611 logwtmp(line, "", ""); 612 #endif 613 } 614 #endif 615 616 /* 617 * Start a session and allocate a controlling terminal. 618 * Only called by children of init after forking. 619 */ 620 void 621 setctty(const char *name) 622 { 623 int fd; 624 625 (void)revoke(name); 626 (void)nanosleep(&dtrtime, NULL); /* leave DTR low for a bit */ 627 if ((fd = open(name, O_RDWR)) == -1) { 628 stall("can't open %s: %m", name); 629 _exit(1); 630 } 631 if (login_tty(fd) == -1) { 632 stall("can't get %s for controlling terminal: %m", name); 633 _exit(2); 634 } 635 } 636 637 /* 638 * Bring the system up single user. 639 */ 640 state_func_t 641 single_user(void) 642 { 643 pid_t pid, wpid; 644 int status; 645 int from_securitylevel; 646 sigset_t mask; 647 struct sigaction sa, satstp, sahup; 648 #ifdef ALTSHELL 649 const char *shell = INIT_BSHELL; 650 #endif 651 const char *argv[2]; 652 #ifdef SECURE 653 struct ttyent *typ; 654 struct passwd *pp; 655 char *clear, *password; 656 #endif 657 #ifdef ALTSHELL 658 char altshell[128]; 659 #endif /* ALTSHELL */ 660 661 #if !defined(LETS_GET_SMALL) && defined(CHROOT) 662 /* Clear previous idea, just in case. */ 663 did_multiuser_chroot = 0; 664 #endif /* !LETS_GET_SMALL && CHROOT */ 665 666 /* 667 * If the kernel is in secure mode, downgrade it to insecure mode. 668 */ 669 from_securitylevel = getsecuritylevel(); 670 if (from_securitylevel > 0) 671 setsecuritylevel(0); 672 673 (void)sigemptyset(&sa.sa_mask); 674 sa.sa_flags = 0; 675 sa.sa_handler = SIG_IGN; 676 (void)sigaction(SIGTSTP, &sa, &satstp); 677 (void)sigaction(SIGHUP, &sa, &sahup); 678 if ((pid = fork()) == 0) { 679 /* 680 * Start the single user session. 681 */ 682 if (access(_PATH_CONSTTY, F_OK) == 0) 683 setctty(_PATH_CONSTTY); 684 else 685 setctty(_PATH_CONSOLE); 686 687 #ifdef SECURE 688 /* 689 * Check the root password. 690 * We don't care if the console is 'on' by default; 691 * it's the only tty that can be 'off' and 'secure'. 692 */ 693 typ = getttynam("console"); 694 pp = getpwnam("root"); 695 if (typ && (from_securitylevel >=2 || (typ->ty_status 696 & TTY_SECURE) == 0) && pp && *pp->pw_passwd != '\0') { 697 (void)fprintf(stderr, 698 "Enter root password, or ^D to go multi-user\n"); 699 for (;;) { 700 clear = getpass("Password:"); 701 if (clear == 0 || *clear == '\0') 702 _exit(0); 703 password = crypt(clear, pp->pw_passwd); 704 (void)memset(clear, 0, _PASSWORD_LEN); 705 if (strcmp(password, pp->pw_passwd) == 0) 706 break; 707 warning("single-user login failed"); 708 } 709 } 710 (void)endttyent(); 711 endpwent(); 712 #endif /* SECURE */ 713 714 #ifdef ALTSHELL 715 (void)fprintf(stderr, 716 "Enter pathname of shell or RETURN for %s: ", shell); 717 if (fgets(altshell, sizeof(altshell), stdin) == NULL) { 718 altshell[0] = '\0'; 719 } else { 720 /* nuke \n */ 721 char *p; 722 723 if ((p = strchr(altshell, '\n')) != NULL) 724 *p = '\0'; 725 } 726 727 if (altshell[0]) 728 shell = altshell; 729 #endif /* ALTSHELL */ 730 731 /* 732 * Unblock signals. 733 * We catch all the interesting ones, 734 * and those are reset to SIG_DFL on exec. 735 */ 736 (void)sigemptyset(&mask); 737 (void)sigprocmask(SIG_SETMASK, &mask, NULL); 738 739 /* 740 * Fire off a shell. 741 * If the default one doesn't work, try the Bourne shell. 742 */ 743 argv[0] = "-sh"; 744 argv[1] = 0; 745 (void)setenv("PATH", INIT_PATH, 1); 746 #ifdef ALTSHELL 747 if (altshell[0]) 748 argv[0] = altshell; 749 (void)execv(shell, __UNCONST(argv)); 750 emergency("can't exec `%s' for single user: %m", shell); 751 argv[0] = "-sh"; 752 #endif /* ALTSHELL */ 753 (void)execv(INIT_BSHELL, __UNCONST(argv)); 754 emergency("can't exec `%s' for single user: %m", INIT_BSHELL); 755 (void)sleep(STALL_TIMEOUT); 756 _exit(3); 757 } 758 759 if (pid == -1) { 760 /* 761 * We are seriously hosed. Do our best. 762 */ 763 emergency("can't fork single-user shell: %m, trying again"); 764 while (waitpid(-1, NULL, WNOHANG) > 0) 765 continue; 766 (void)sigaction(SIGTSTP, &satstp, NULL); 767 (void)sigaction(SIGHUP, &sahup, NULL); 768 return (state_func_t)single_user; 769 } 770 771 requested_transition = 0; 772 do { 773 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 774 collect_child(wpid, status); 775 if (wpid == -1) { 776 if (errno == EINTR) 777 continue; 778 warning("wait for single-user shell failed: %m; " 779 "restarting"); 780 return (state_func_t)single_user; 781 } 782 if (wpid == pid && WIFSTOPPED(status)) { 783 warning("shell stopped, restarting"); 784 (void)kill(pid, SIGCONT); 785 wpid = -1; 786 } 787 } while (wpid != pid && !requested_transition); 788 789 if (requested_transition) { 790 (void)sigaction(SIGTSTP, &satstp, NULL); 791 (void)sigaction(SIGHUP, &sahup, NULL); 792 return (state_func_t)requested_transition; 793 } 794 795 if (WIFSIGNALED(status)) { 796 if (WTERMSIG(status) == SIGKILL) { 797 /* executed /sbin/reboot; wait for the end quietly */ 798 sigset_t s; 799 800 (void)sigfillset(&s); 801 for (;;) 802 (void)sigsuspend(&s); 803 } else { 804 warning("single user shell terminated (%x), restarting", 805 status); 806 (void)sigaction(SIGTSTP, &satstp, NULL); 807 (void)sigaction(SIGHUP, &sahup, NULL); 808 return (state_func_t)single_user; 809 } 810 } 811 812 runcom_mode = FASTBOOT; 813 (void)sigaction(SIGTSTP, &satstp, NULL); 814 (void)sigaction(SIGHUP, &sahup, NULL); 815 #ifndef LETS_GET_SMALL 816 return (state_func_t)runcom; 817 #else /* LETS_GET_SMALL */ 818 return (state_func_t)single_user; 819 #endif /* LETS_GET_SMALL */ 820 } 821 822 #ifndef LETS_GET_SMALL 823 824 /* ARGSUSED */ 825 state_func_t 826 runetcrc(int trychroot) 827 { 828 pid_t pid, wpid; 829 int status; 830 const char *argv[4]; 831 struct sigaction sa; 832 833 switch ((pid = fork())) { 834 case 0: 835 (void)sigemptyset(&sa.sa_mask); 836 sa.sa_flags = 0; 837 sa.sa_handler = SIG_IGN; 838 (void)sigaction(SIGTSTP, &sa, NULL); 839 (void)sigaction(SIGHUP, &sa, NULL); 840 841 setctty(_PATH_CONSOLE); 842 843 argv[0] = "sh"; 844 argv[1] = _PATH_RUNCOM; 845 argv[2] = (runcom_mode == AUTOBOOT ? "autoboot" : 0); 846 argv[3] = 0; 847 848 (void)sigprocmask(SIG_SETMASK, &sa.sa_mask, NULL); 849 850 #ifdef CHROOT 851 if (trychroot) 852 if (chroot(rootdir) != 0) { 853 warning("failed to chroot to `%s': %m", 854 rootdir); 855 _exit(4); /* force single user mode */ 856 } 857 #endif /* CHROOT */ 858 859 (void)execv(INIT_BSHELL, __UNCONST(argv)); 860 stall("can't exec `%s' for `%s': %m", INIT_BSHELL, _PATH_RUNCOM); 861 _exit(5); /* force single user mode */ 862 /*NOTREACHED*/ 863 case -1: 864 emergency("can't fork for `%s' on `%s': %m", INIT_BSHELL, 865 _PATH_RUNCOM); 866 while (waitpid(-1, NULL, WNOHANG) > 0) 867 continue; 868 (void)sleep(STALL_TIMEOUT); 869 return (state_func_t)single_user; 870 default: 871 break; 872 } 873 874 /* 875 * Copied from single_user(). This is a bit paranoid. 876 */ 877 do { 878 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 879 collect_child(wpid, status); 880 if (wpid == -1) { 881 if (errno == EINTR) 882 continue; 883 warning("wait for `%s' on `%s' failed: %m; going to " 884 "single user mode", INIT_BSHELL, _PATH_RUNCOM); 885 return (state_func_t)single_user; 886 } 887 if (wpid == pid && WIFSTOPPED(status)) { 888 warning("`%s' on `%s' stopped, restarting", 889 INIT_BSHELL, _PATH_RUNCOM); 890 (void)kill(pid, SIGCONT); 891 wpid = -1; 892 } 893 } while (wpid != pid); 894 895 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGTERM && 896 requested_transition == catatonia) { 897 /* /etc/rc executed /sbin/reboot; wait for the end quietly */ 898 sigset_t s; 899 900 (void)sigfillset(&s); 901 for (;;) 902 (void)sigsuspend(&s); 903 } 904 905 if (!WIFEXITED(status)) { 906 warning("`%s' on `%s' terminated abnormally, going to " 907 "single user mode", INIT_BSHELL, _PATH_RUNCOM); 908 return (state_func_t)single_user; 909 } 910 911 if (WEXITSTATUS(status)) 912 return (state_func_t)single_user; 913 914 return (state_func_t)read_ttys; 915 } 916 917 /* 918 * Run the system startup script. 919 */ 920 state_func_t 921 runcom(void) 922 { 923 state_func_t next_step; 924 925 /* Run /etc/rc and choose next state depending on the result. */ 926 next_step = runetcrc(0); 927 if (next_step != (state_func_t)read_ttys) 928 return (state_func_t)next_step; 929 930 #ifdef CHROOT 931 /* 932 * If init.root sysctl does not point to "/", we'll chroot and run 933 * The Real(tm) /etc/rc now. Global variable rootdir will tell us 934 * where to go. 935 */ 936 if (shouldchroot()) { 937 next_step = runetcrc(1); 938 if (next_step != (state_func_t)read_ttys) 939 return (state_func_t)next_step; 940 941 did_multiuser_chroot = 1; 942 } else { 943 did_multiuser_chroot = 0; 944 } 945 #endif /* CHROOT */ 946 947 /* 948 * Regardless of whether in chroot or not, we booted successfuly. 949 * It's time to spawn gettys (ie. next_step's value at this point). 950 */ 951 runcom_mode = AUTOBOOT; /* the default */ 952 /* NB: should send a message to the session logger to avoid blocking. */ 953 #ifdef SUPPORT_UTMPX 954 logwtmpx("~", "reboot", "", 0, INIT_PROCESS); 955 #endif 956 #ifdef SUPPORT_UTMP 957 logwtmp("~", "reboot", ""); 958 #endif 959 return (state_func_t)read_ttys; 960 } 961 962 /* 963 * Open the session database. 964 * 965 * NB: We could pass in the size here; is it necessary? 966 */ 967 int 968 start_session_db(void) 969 { 970 971 if (session_db && (*session_db->close)(session_db)) 972 emergency("session database close: %m"); 973 if ((session_db = dbopen(NULL, O_RDWR, 0, DB_HASH, NULL)) == 0) { 974 emergency("session database open: %m"); 975 return 1; 976 } 977 return 0; 978 979 } 980 981 /* 982 * Add a new login session. 983 */ 984 void 985 add_session(session_t *sp) 986 { 987 DBT key; 988 DBT data; 989 990 if (session_db == NULL) 991 return; 992 993 key.data = &sp->se_process; 994 key.size = sizeof sp->se_process; 995 data.data = &sp; 996 data.size = sizeof sp; 997 998 if ((*session_db->put)(session_db, &key, &data, 0)) 999 emergency("insert %d: %m", sp->se_process); 1000 #ifdef SUPPORT_UTMPX 1001 session_utmpx(sp, 1); 1002 #endif 1003 } 1004 1005 /* 1006 * Delete an old login session. 1007 */ 1008 void 1009 del_session(session_t *sp) 1010 { 1011 DBT key; 1012 1013 key.data = &sp->se_process; 1014 key.size = sizeof sp->se_process; 1015 1016 if ((*session_db->del)(session_db, &key, 0)) 1017 emergency("delete %d: %m", sp->se_process); 1018 #ifdef SUPPORT_UTMPX 1019 session_utmpx(sp, 0); 1020 #endif 1021 } 1022 1023 /* 1024 * Look up a login session by pid. 1025 */ 1026 session_t * 1027 find_session(pid_t pid) 1028 { 1029 DBT key; 1030 DBT data; 1031 session_t *ret; 1032 1033 if (session_db == NULL) 1034 return NULL; 1035 1036 key.data = &pid; 1037 key.size = sizeof pid; 1038 if ((*session_db->get)(session_db, &key, &data, 0) != 0) 1039 return 0; 1040 (void)memmove(&ret, data.data, sizeof(ret)); 1041 return ret; 1042 } 1043 1044 /* 1045 * Construct an argument vector from a command line. 1046 */ 1047 char ** 1048 construct_argv(char *command) 1049 { 1050 int argc = 0; 1051 char **argv = malloc(((strlen(command) + 1) / 2 + 1) * sizeof (char *)); 1052 static const char separators[] = " \t"; 1053 1054 if (argv == NULL) 1055 return NULL; 1056 1057 if ((argv[argc++] = strtok(command, separators)) == 0) { 1058 free(argv); 1059 return NULL; 1060 } 1061 while ((argv[argc++] = strtok(NULL, separators)) != NULL) 1062 continue; 1063 return argv; 1064 } 1065 1066 /* 1067 * Deallocate a session descriptor. 1068 */ 1069 void 1070 free_session(session_t *sp) 1071 { 1072 1073 free(sp->se_device); 1074 if (sp->se_getty) { 1075 free(sp->se_getty); 1076 free(sp->se_getty_argv); 1077 } 1078 if (sp->se_window) { 1079 free(sp->se_window); 1080 free(sp->se_window_argv); 1081 } 1082 free(sp); 1083 } 1084 1085 /* 1086 * Allocate a new session descriptor. 1087 */ 1088 session_t * 1089 new_session(session_t *sprev, int session_index, struct ttyent *typ) 1090 { 1091 session_t *sp; 1092 1093 if ((typ->ty_status & TTY_ON) == 0 || typ->ty_name == NULL || 1094 typ->ty_getty == NULL) 1095 return NULL; 1096 1097 sp = malloc(sizeof (session_t)); 1098 if (sp == NULL) 1099 return NULL; 1100 (void)memset(sp, 0, sizeof *sp); 1101 1102 sp->se_flags = SE_PRESENT; 1103 sp->se_index = session_index; 1104 1105 (void)asprintf(&sp->se_device, "%s%s", _PATH_DEV, typ->ty_name); 1106 if (!sp->se_device) 1107 return NULL; 1108 1109 if (setupargv(sp, typ) == 0) { 1110 free_session(sp); 1111 return NULL; 1112 } 1113 1114 sp->se_next = NULL; 1115 if (sprev == NULL) { 1116 sessions = sp; 1117 sp->se_prev = NULL; 1118 } else { 1119 sprev->se_next = sp; 1120 sp->se_prev = sprev; 1121 } 1122 1123 return sp; 1124 } 1125 1126 /* 1127 * Calculate getty and if useful window argv vectors. 1128 */ 1129 int 1130 setupargv(session_t *sp, struct ttyent *typ) 1131 { 1132 1133 if (sp->se_getty) { 1134 free(sp->se_getty); 1135 free(sp->se_getty_argv); 1136 } 1137 (void)asprintf(&sp->se_getty, "%s %s", typ->ty_getty, typ->ty_name); 1138 if (!sp->se_getty) 1139 return 0; 1140 sp->se_getty_argv = construct_argv(sp->se_getty); 1141 if (sp->se_getty_argv == NULL) { 1142 warning("can't parse getty for port `%s'", sp->se_device); 1143 free(sp->se_getty); 1144 sp->se_getty = NULL; 1145 return 0; 1146 } 1147 if (typ->ty_window) { 1148 if (sp->se_window) 1149 free(sp->se_window); 1150 sp->se_window = strdup(typ->ty_window); 1151 sp->se_window_argv = construct_argv(sp->se_window); 1152 if (sp->se_window_argv == NULL) { 1153 warning("can't parse window for port `%s'", 1154 sp->se_device); 1155 free(sp->se_window); 1156 sp->se_window = NULL; 1157 return 0; 1158 } 1159 } 1160 return 1; 1161 } 1162 1163 /* 1164 * Walk the list of ttys and create sessions for each active line. 1165 */ 1166 state_func_t 1167 read_ttys(void) 1168 { 1169 int session_index = 0; 1170 session_t *sp, *snext; 1171 struct ttyent *typ; 1172 1173 #ifdef SUPPORT_UTMPX 1174 if (sessions == NULL) { 1175 struct stat st; 1176 1177 make_utmpx("", BOOT_MSG, BOOT_TIME, 0, &boot_time, 0); 1178 1179 /* 1180 * If wtmpx is not empty, pick the down time from there 1181 */ 1182 if (stat(_PATH_WTMPX, &st) != -1 && st.st_size != 0) { 1183 struct timeval down_time; 1184 1185 TIMESPEC_TO_TIMEVAL(&down_time, 1186 st.st_atime > st.st_mtime ? 1187 &st.st_atimespec : &st.st_mtimespec); 1188 make_utmpx("", DOWN_MSG, DOWN_TIME, 0, &down_time, 0); 1189 } 1190 } 1191 #endif 1192 /* 1193 * Destroy any previous session state. 1194 * There shouldn't be any, but just in case... 1195 */ 1196 for (sp = sessions; sp; sp = snext) { 1197 #ifndef LETS_GET_SMALL 1198 if (sp->se_process) 1199 clear_session_logs(sp, 0); 1200 #endif 1201 snext = sp->se_next; 1202 free_session(sp); 1203 } 1204 sessions = NULL; 1205 1206 if (start_session_db()) { 1207 warning("start_session_db failed, death"); 1208 #ifdef CHROOT 1209 /* If /etc/rc ran in chroot, we want to kill any survivors. */ 1210 if (did_multiuser_chroot) 1211 return (state_func_t)death; 1212 else 1213 #endif /* CHROOT */ 1214 return (state_func_t)single_user; 1215 } 1216 1217 (void)do_setttyent(); 1218 1219 /* 1220 * Allocate a session entry for each active port. 1221 * Note that sp starts at 0. 1222 */ 1223 while ((typ = getttyent()) != NULL) 1224 if ((snext = new_session(sp, ++session_index, typ)) != NULL) 1225 sp = snext; 1226 (void)endttyent(); 1227 1228 return (state_func_t)multi_user; 1229 } 1230 1231 /* 1232 * Start a window system running. 1233 */ 1234 void 1235 start_window_system(session_t *sp) 1236 { 1237 pid_t pid; 1238 sigset_t mask; 1239 1240 if ((pid = fork()) == -1) { 1241 emergency("can't fork for window system on port `%s': %m", 1242 sp->se_device); 1243 /* hope that getty fails and we can try again */ 1244 return; 1245 } 1246 1247 if (pid) 1248 return; 1249 1250 (void)sigemptyset(&mask); 1251 (void)sigprocmask(SIG_SETMASK, &mask, NULL); 1252 1253 if (setsid() < 0) 1254 emergency("setsid failed (window): %m"); 1255 1256 (void)execv(sp->se_window_argv[0], sp->se_window_argv); 1257 stall("can't exec window system `%s' for port `%s': %m", 1258 sp->se_window_argv[0], sp->se_device); 1259 _exit(6); 1260 } 1261 1262 /* 1263 * Start a login session running. 1264 */ 1265 pid_t 1266 start_getty(session_t *sp) 1267 { 1268 pid_t pid; 1269 sigset_t mask; 1270 time_t current_time = time(NULL); 1271 1272 /* 1273 * fork(), not vfork() -- we can't afford to block. 1274 */ 1275 if ((pid = fork()) == -1) { 1276 emergency("can't fork for getty on port `%s': %m", 1277 sp->se_device); 1278 return -1; 1279 } 1280 1281 if (pid) 1282 return pid; 1283 1284 #ifdef CHROOT 1285 /* If /etc/rc did proceed inside chroot, we have to try as well. */ 1286 if (did_multiuser_chroot) 1287 if (chroot(rootdir) != 0) { 1288 stall("can't chroot getty `%s' inside `%s': %m", 1289 sp->se_getty_argv[0], rootdir); 1290 _exit(7); 1291 } 1292 #endif /* CHROOT */ 1293 1294 if (current_time > sp->se_started.tv_sec && 1295 current_time - sp->se_started.tv_sec < GETTY_SPACING) { 1296 warning("getty repeating too quickly on port `%s', sleeping", 1297 sp->se_device); 1298 (void)sleep(GETTY_SLEEP); 1299 } 1300 1301 if (sp->se_window) { 1302 start_window_system(sp); 1303 (void)sleep(WINDOW_WAIT); 1304 } 1305 1306 (void)sigemptyset(&mask); 1307 (void)sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0); 1308 1309 (void)execv(sp->se_getty_argv[0], sp->se_getty_argv); 1310 stall("can't exec getty `%s' for port `%s': %m", 1311 sp->se_getty_argv[0], sp->se_device); 1312 _exit(8); 1313 /*NOTREACHED*/ 1314 } 1315 #ifdef SUPPORT_UTMPX 1316 static void 1317 session_utmpx(const session_t *sp, int add) 1318 { 1319 const char *name = sp->se_getty ? sp->se_getty : 1320 (sp->se_window ? sp->se_window : ""); 1321 const char *line = sp->se_device + sizeof(_PATH_DEV) - 1; 1322 1323 make_utmpx(name, line, add ? LOGIN_PROCESS : DEAD_PROCESS, 1324 sp->se_process, &sp->se_started, sp->se_index); 1325 } 1326 1327 static void 1328 make_utmpx(const char *name, const char *line, int type, pid_t pid, 1329 const struct timeval *tv, int session) 1330 { 1331 struct utmpx ut; 1332 const char *eline; 1333 1334 (void)memset(&ut, 0, sizeof(ut)); 1335 (void)strlcpy(ut.ut_name, name, sizeof(ut.ut_name)); 1336 ut.ut_type = type; 1337 (void)strlcpy(ut.ut_line, line, sizeof(ut.ut_line)); 1338 ut.ut_pid = pid; 1339 if (tv) 1340 ut.ut_tv = *tv; 1341 else 1342 (void)gettimeofday(&ut.ut_tv, NULL); 1343 ut.ut_session = session; 1344 1345 eline = line + strlen(line); 1346 if ((size_t)(eline - line) >= sizeof(ut.ut_id)) 1347 line = eline - sizeof(ut.ut_id); 1348 (void)strncpy(ut.ut_id, line, sizeof(ut.ut_id)); 1349 1350 if (pututxline(&ut) == NULL) 1351 warning("can't add utmpx record for `%s': %m", ut.ut_line); 1352 endutxent(); 1353 } 1354 1355 static char 1356 get_runlevel(const state_t s) 1357 { 1358 if (s == (state_t)single_user) 1359 return SINGLE_USER; 1360 if (s == (state_t)runcom) 1361 return RUNCOM; 1362 if (s == (state_t)read_ttys) 1363 return READ_TTYS; 1364 if (s == (state_t)multi_user) 1365 return MULTI_USER; 1366 if (s == (state_t)clean_ttys) 1367 return CLEAN_TTYS; 1368 if (s == (state_t)catatonia) 1369 return CATATONIA; 1370 return DEATH; 1371 } 1372 1373 static void 1374 utmpx_set_runlevel(char old, char new) 1375 { 1376 struct utmpx ut; 1377 1378 /* 1379 * Don't record any transitions until we did the first transition 1380 * to read ttys, which is when we are guaranteed to have a read-write 1381 * /var. Perhaps use a different variable for this? 1382 */ 1383 if (sessions == NULL) 1384 return; 1385 1386 (void)memset(&ut, 0, sizeof(ut)); 1387 (void)snprintf(ut.ut_line, sizeof(ut.ut_line), RUNLVL_MSG, new); 1388 ut.ut_type = RUN_LVL; 1389 (void)gettimeofday(&ut.ut_tv, NULL); 1390 ut.ut_exit.e_exit = old; 1391 ut.ut_exit.e_termination = new; 1392 if (pututxline(&ut) == NULL) 1393 warning("can't add utmpx record for `runlevel': %m"); 1394 endutxent(); 1395 } 1396 #endif /* SUPPORT_UTMPX */ 1397 1398 #endif /* LETS_GET_SMALL */ 1399 1400 /* 1401 * Collect exit status for a child. 1402 * If an exiting login, start a new login running. 1403 */ 1404 void 1405 collect_child(pid_t pid, int status) 1406 { 1407 #ifndef LETS_GET_SMALL 1408 session_t *sp, *sprev, *snext; 1409 1410 if (! sessions) 1411 return; 1412 1413 if ((sp = find_session(pid)) == NULL) 1414 return; 1415 1416 clear_session_logs(sp, status); 1417 del_session(sp); 1418 sp->se_process = 0; 1419 1420 if (sp->se_flags & SE_SHUTDOWN) { 1421 if ((sprev = sp->se_prev) != NULL) 1422 sprev->se_next = sp->se_next; 1423 else 1424 sessions = sp->se_next; 1425 if ((snext = sp->se_next) != NULL) 1426 snext->se_prev = sp->se_prev; 1427 free_session(sp); 1428 return; 1429 } 1430 1431 if ((pid = start_getty(sp)) == -1) { 1432 /* serious trouble */ 1433 requested_transition = clean_ttys; 1434 return; 1435 } 1436 1437 sp->se_process = pid; 1438 (void)gettimeofday(&sp->se_started, NULL); 1439 add_session(sp); 1440 #endif /* LETS_GET_SMALL */ 1441 } 1442 1443 /* 1444 * Catch a signal and request a state transition. 1445 */ 1446 void 1447 transition_handler(int sig) 1448 { 1449 1450 switch (sig) { 1451 #ifndef LETS_GET_SMALL 1452 case SIGHUP: 1453 requested_transition = clean_ttys; 1454 break; 1455 case SIGTERM: 1456 requested_transition = death; 1457 break; 1458 case SIGTSTP: 1459 requested_transition = catatonia; 1460 break; 1461 #endif /* LETS_GET_SMALL */ 1462 default: 1463 requested_transition = 0; 1464 break; 1465 } 1466 } 1467 1468 #ifndef LETS_GET_SMALL 1469 /* 1470 * Take the system multiuser. 1471 */ 1472 state_func_t 1473 multi_user(void) 1474 { 1475 pid_t pid; 1476 int status; 1477 session_t *sp; 1478 1479 requested_transition = 0; 1480 1481 /* 1482 * If the administrator has not set the security level to -1 1483 * to indicate that the kernel should not run multiuser in secure 1484 * mode, and the run script has not set a higher level of security 1485 * than level 1, then put the kernel into secure mode. 1486 */ 1487 if (getsecuritylevel() == 0) 1488 setsecuritylevel(1); 1489 1490 for (sp = sessions; sp; sp = sp->se_next) { 1491 if (sp->se_process) 1492 continue; 1493 if ((pid = start_getty(sp)) == -1) { 1494 /* serious trouble */ 1495 requested_transition = clean_ttys; 1496 break; 1497 } 1498 sp->se_process = pid; 1499 (void)gettimeofday(&sp->se_started, NULL); 1500 add_session(sp); 1501 } 1502 1503 while (!requested_transition) 1504 if ((pid = waitpid(-1, &status, 0)) != -1) 1505 collect_child(pid, status); 1506 1507 return (state_func_t)requested_transition; 1508 } 1509 1510 /* 1511 * This is an n-squared algorithm. We hope it isn't run often... 1512 */ 1513 state_func_t 1514 clean_ttys(void) 1515 { 1516 session_t *sp, *sprev; 1517 struct ttyent *typ; 1518 int session_index = 0; 1519 int devlen; 1520 1521 for (sp = sessions; sp; sp = sp->se_next) 1522 sp->se_flags &= ~SE_PRESENT; 1523 1524 (void)do_setttyent(); 1525 1526 devlen = sizeof(_PATH_DEV) - 1; 1527 while ((typ = getttyent()) != NULL) { 1528 ++session_index; 1529 1530 for (sprev = 0, sp = sessions; sp; sprev = sp, sp = sp->se_next) 1531 if (strcmp(typ->ty_name, sp->se_device + devlen) == 0) 1532 break; 1533 1534 if (sp) { 1535 sp->se_flags |= SE_PRESENT; 1536 if (sp->se_index != session_index) { 1537 warning("port `%s' changed utmp index from " 1538 "%d to %d", sp->se_device, sp->se_index, 1539 session_index); 1540 sp->se_index = session_index; 1541 } 1542 if ((typ->ty_status & TTY_ON) == 0 || 1543 typ->ty_getty == 0) { 1544 sp->se_flags |= SE_SHUTDOWN; 1545 if (sp->se_process != 0) 1546 (void)kill(sp->se_process, SIGHUP); 1547 continue; 1548 } 1549 sp->se_flags &= ~SE_SHUTDOWN; 1550 if (setupargv(sp, typ) == 0) { 1551 warning("can't parse getty for port `%s'", 1552 sp->se_device); 1553 sp->se_flags |= SE_SHUTDOWN; 1554 if (sp->se_process != 0) 1555 (void)kill(sp->se_process, SIGHUP); 1556 } 1557 continue; 1558 } 1559 1560 (void)new_session(sprev, session_index, typ); 1561 } 1562 1563 (void)endttyent(); 1564 1565 for (sp = sessions; sp; sp = sp->se_next) 1566 if ((sp->se_flags & SE_PRESENT) == 0) { 1567 sp->se_flags |= SE_SHUTDOWN; 1568 if (sp->se_process != 0) 1569 (void)kill(sp->se_process, SIGHUP); 1570 } 1571 1572 return (state_func_t)multi_user; 1573 } 1574 1575 /* 1576 * Block further logins. 1577 */ 1578 state_func_t 1579 catatonia(void) 1580 { 1581 session_t *sp; 1582 1583 for (sp = sessions; sp; sp = sp->se_next) 1584 sp->se_flags |= SE_SHUTDOWN; 1585 1586 return (state_func_t)multi_user; 1587 } 1588 #endif /* LETS_GET_SMALL */ 1589 1590 /* 1591 * Note SIGALRM. 1592 */ 1593 void 1594 /*ARGSUSED*/ 1595 alrm_handler(int sig) 1596 { 1597 1598 clang = 1; 1599 } 1600 1601 #ifndef LETS_GET_SMALL 1602 /* 1603 * Bring the system down to single user. 1604 */ 1605 state_func_t 1606 death(void) 1607 { 1608 session_t *sp; 1609 int i, status; 1610 pid_t pid; 1611 static const int death_sigs[3] = { SIGHUP, SIGTERM, SIGKILL }; 1612 1613 for (sp = sessions; sp; sp = sp->se_next) 1614 sp->se_flags |= SE_SHUTDOWN; 1615 1616 /* NB: should send a message to the session logger to avoid blocking. */ 1617 #ifdef SUPPORT_UTMPX 1618 logwtmpx("~", "shutdown", "", 0, INIT_PROCESS); 1619 #endif 1620 #ifdef SUPPORT_UTMP 1621 logwtmp("~", "shutdown", ""); 1622 #endif 1623 1624 for (i = 0; i < 3; ++i) { 1625 if (kill(-1, death_sigs[i]) == -1 && errno == ESRCH) 1626 return (state_func_t)single_user; 1627 1628 clang = 0; 1629 (void)alarm(DEATH_WATCH); 1630 do 1631 if ((pid = waitpid(-1, &status, 0)) != -1) 1632 collect_child(pid, status); 1633 while (clang == 0 && errno != ECHILD); 1634 1635 if (errno == ECHILD) 1636 return (state_func_t)single_user; 1637 } 1638 1639 warning("some processes would not die; ps axl advised"); 1640 1641 return (state_func_t)single_user; 1642 } 1643 #endif /* LETS_GET_SMALL */ 1644 1645 #ifdef MFS_DEV_IF_NO_CONSOLE 1646 1647 static int 1648 mfs_dev(void) 1649 { 1650 /* 1651 * We cannot print errors so we bail out silently... 1652 */ 1653 pid_t pid; 1654 int status; 1655 1656 /* If we have /dev/console, assume all is OK */ 1657 if (access(_PATH_CONSOLE, F_OK) == 0) 1658 return 0; 1659 1660 #if 0 /* Useful for testing MAKEDEV */ 1661 /* Mount an mfs over /mnt so we can create a console entry */ 1662 switch ((pid = fork())) { 1663 case 0: 1664 (void)execl(INIT_MOUNT_MFS, "mount_mfs", 1665 "-b", "4096", "-f", "512", 1666 "-s", 64, "-n", 10, 1667 "-p", "0755", 1668 "swap", "/mnt", NULL); 1669 _exit(9); 1670 /*NOTREACHED*/ 1671 1672 case -1: 1673 return(-1); 1674 1675 default: 1676 if (waitpid(pid, &status, 0) == -1) 1677 return(-1); 1678 if (status != 0) 1679 return(-1); 1680 break; 1681 } 1682 1683 { 1684 dev_t dev; 1685 #ifdef CPU_CONSDEV 1686 static int name[2] = { CTL_MACHDEP, CPU_CONSDEV }; 1687 size_t olen; 1688 olen = sizeof(dev); 1689 if (sysctl(name, sizeof(name) / sizeof(name[0]), &dev, &olen, 1690 NULL, 0) == -1) 1691 #endif 1692 dev = makedev(0, 0); 1693 1694 /* Make a console for us, so we can see things happening */ 1695 if (mknod("/mnt/console", 0666 | S_IFCHR, dev) == -1) 1696 return(-1); 1697 (void)freopen("/mnt/console", "a", stderr); 1698 } 1699 1700 #endif 1701 1702 /* Run the makedev script to create devices */ 1703 switch ((pid = fork())) { 1704 case 0: 1705 (void)dup2(2, 1); /* Give the script stdout */ 1706 if (chdir("/dev") == 0) 1707 (void)execl(INIT_BSHELL, "sh", 1708 access("./MAKEDEV", X_OK) == 0 1709 ? "./MAKEDEV" : "/etc/MAKEDEV", 1710 "-MM", "init", NULL); 1711 _exit(10); 1712 /* NOTREACHED */ 1713 1714 case -1: 1715 break; 1716 1717 default: 1718 if (waitpid(pid, &status, 0) == -1) 1719 break; 1720 if (status != 0) 1721 warn("MAKEDEV exit status %d\n", status); 1722 /* 1723 * If /dev/console got created, then return 0 1724 * regardless of MAKEDEV exit status. 1725 */ 1726 if (access(_PATH_CONSOLE, F_OK) == 0) 1727 return 0; 1728 _exit(11); 1729 } 1730 warn("Unable to run MAKEDEV"); 1731 _exit(12); 1732 } 1733 #endif 1734 1735 int 1736 do_setttyent(void) 1737 { 1738 (void)endttyent(); 1739 #ifdef CHROOT 1740 if (did_multiuser_chroot) { 1741 char path[PATH_MAX]; 1742 1743 (void)snprintf(path, sizeof(path), "%s/%s", rootdir, _PATH_TTYS); 1744 1745 return setttyentpath(path); 1746 } else 1747 #endif /* CHROOT */ 1748 return setttyent(); 1749 } 1750 1751 #if !defined(LETS_GET_SMALL) && defined(CHROOT) 1752 1753 int 1754 createsysctlnode() 1755 { 1756 struct sysctlnode node; 1757 int mib[2]; 1758 size_t len; 1759 1760 /* 1761 * Create top-level dynamic sysctl node. Its child nodes will only 1762 * be readable by the superuser, since regular mortals should not 1763 * care ("Sssh, it's a secret!"). 1764 */ 1765 len = sizeof(struct sysctlnode); 1766 mib[0] = CTL_CREATE; 1767 1768 (void)memset(&node, 0, len); 1769 node.sysctl_flags = SYSCTL_VERSION | CTLFLAG_READWRITE | 1770 CTLFLAG_PRIVATE | CTLTYPE_NODE; 1771 node.sysctl_num = CTL_CREATE; 1772 (void)snprintf(node.sysctl_name, SYSCTL_NAMELEN, "init"); 1773 if (sysctl(&mib[0], 1, &node, &len, &node, len) == -1) { 1774 warning("could not create init node: %m"); 1775 return -1; 1776 } 1777 1778 /* 1779 * Create second level dynamic node capable of holding pathname. 1780 * Provide "/" as the default value. 1781 */ 1782 len = sizeof(struct sysctlnode); 1783 mib[0] = node.sysctl_num; 1784 mib[1] = CTL_CREATE; 1785 1786 (void)memset(&node, 0, len); 1787 node.sysctl_flags = SYSCTL_VERSION | CTLFLAG_READWRITE | 1788 CTLTYPE_STRING | CTLFLAG_OWNDATA; 1789 node.sysctl_size = _POSIX_PATH_MAX; 1790 node.sysctl_data = __UNCONST("/"); 1791 node.sysctl_num = CTL_CREATE; 1792 (void)snprintf(node.sysctl_name, SYSCTL_NAMELEN, "root"); 1793 if (sysctl(&mib[0], 2, NULL, NULL, &node, len) == -1) { 1794 warning("could not create init.root node: %m"); 1795 return -1; 1796 } 1797 1798 return 0; 1799 } 1800 1801 int 1802 shouldchroot() 1803 { 1804 struct sysctlnode node; 1805 size_t len, cnt; 1806 int mib; 1807 1808 len = sizeof(struct sysctlnode); 1809 1810 if (sysctlbyname("init.root", rootdir, &len, NULL, 0) == -1) { 1811 warning("could not read init.root: %m"); 1812 1813 /* Child killed our node. Recreate it. */ 1814 if (errno == ENOENT) { 1815 /* Destroy whatever is left, recreate from scratch. */ 1816 if (sysctlnametomib("init", &mib, &cnt) != -1) { 1817 (void)memset(&node, 0, sizeof(node)); 1818 node.sysctl_flags = SYSCTL_VERSION; 1819 node.sysctl_num = mib; 1820 mib = CTL_DESTROY; 1821 1822 (void)sysctl(&mib, 1, NULL, NULL, &node, 1823 sizeof(node)); 1824 } 1825 1826 (void)createsysctlnode(); 1827 } 1828 1829 /* We certainly won't chroot. */ 1830 return 0; 1831 } 1832 1833 if (rootdir[len] != '\0' || strlen(rootdir) != len - 1) { 1834 warning("init.root is not a string"); 1835 return 0; 1836 } 1837 1838 if (strcmp(rootdir, "/") == 0) 1839 return 0; 1840 1841 return 1; 1842 } 1843 1844 #endif /* !LETS_GET_SMALL && CHROOT */ 1845