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. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#) Copyright (c) 1991, 1993 The Regents of the University of California. All rights reserved. 37 * @(#)init.c 8.1 (Berkeley) 7/15/93 38 * $FreeBSD: src/sbin/init/init.c,v 1.38.2.8 2001/10/22 11:27:32 des Exp $ 39 * $DragonFly: src/sbin/init/init.c,v 1.7 2004/12/18 21:43:38 swildner Exp $ 40 */ 41 42 #include <sys/param.h> 43 #include <sys/ioctl.h> 44 #include <sys/mount.h> 45 #include <sys/sysctl.h> 46 #include <sys/wait.h> 47 #include <sys/stat.h> 48 49 #include <db.h> 50 #include <errno.h> 51 #include <fcntl.h> 52 #include <libutil.h> 53 #include <paths.h> 54 #include <signal.h> 55 #include <stdio.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <syslog.h> 59 #include <time.h> 60 #include <ttyent.h> 61 #include <unistd.h> 62 #include <sys/reboot.h> 63 #include <err.h> 64 65 #ifdef __STDC__ 66 #include <stdarg.h> 67 #else 68 #include <varargs.h> 69 #endif 70 71 #ifdef SECURE 72 #include <pwd.h> 73 #endif 74 75 #ifdef LOGIN_CAP 76 #include <login_cap.h> 77 #endif 78 79 #include "pathnames.h" 80 81 /* 82 * Sleep times; used to prevent thrashing. 83 */ 84 #define GETTY_SPACING 5 /* N secs minimum getty spacing */ 85 #define GETTY_SLEEP 30 /* sleep N secs after spacing problem */ 86 #define GETTY_NSPACE 3 /* max. spacing count to bring reaction */ 87 #define WINDOW_WAIT 3 /* wait N secs after starting window */ 88 #define STALL_TIMEOUT 30 /* wait N secs after warning */ 89 #define DEATH_WATCH 10 /* wait N secs for procs to die */ 90 #define DEATH_SCRIPT 120 /* wait for 2min for /etc/rc.shutdown */ 91 #define RESOURCE_RC "daemon" 92 #define RESOURCE_WINDOW "default" 93 #define RESOURCE_GETTY "default" 94 95 void handle(sig_t, ...); 96 void delset(sigset_t *, ...); 97 98 void stall(char *, ...); 99 void warning(char *, ...); 100 void emergency(char *, ...); 101 void disaster(int); 102 void badsys(int); 103 int runshutdown(void); 104 105 /* 106 * We really need a recursive typedef... 107 * The following at least guarantees that the return type of (*state_t)() 108 * is sufficiently wide to hold a function pointer. 109 */ 110 typedef long (*state_func_t)(void); 111 typedef state_func_t (*state_t)(void); 112 113 state_func_t single_user(void); 114 state_func_t runcom(void); 115 state_func_t read_ttys(void); 116 state_func_t multi_user(void); 117 state_func_t clean_ttys(void); 118 state_func_t catatonia(void); 119 state_func_t death(void); 120 121 enum { AUTOBOOT, FASTBOOT } runcom_mode = AUTOBOOT; 122 #define FALSE 0 123 #define TRUE 1 124 125 int Reboot = FALSE; 126 int howto = RB_AUTOBOOT; 127 128 void transition(state_t); 129 state_t requested_transition = runcom; 130 131 void setctty(char *); 132 133 typedef struct init_session { 134 int se_index; /* index of entry in ttys file */ 135 pid_t se_process; /* controlling process */ 136 time_t se_started; /* used to avoid thrashing */ 137 int se_flags; /* status of session */ 138 #define SE_SHUTDOWN 0x1 /* session won't be restarted */ 139 #define SE_PRESENT 0x2 /* session is in /etc/ttys */ 140 int se_nspace; /* spacing count */ 141 char *se_device; /* filename of port */ 142 char *se_getty; /* what to run on that port */ 143 char *se_getty_argv_space; /* pre-parsed argument array space */ 144 char **se_getty_argv; /* pre-parsed argument array */ 145 char *se_window; /* window system (started only once) */ 146 char *se_window_argv_space; /* pre-parsed argument array space */ 147 char **se_window_argv; /* pre-parsed argument array */ 148 char *se_type; /* default terminal type */ 149 struct init_session *se_prev; 150 struct init_session *se_next; 151 } session_t; 152 153 void free_session(session_t *); 154 session_t *new_session(session_t *, int, struct ttyent *); 155 session_t *sessions; 156 157 char **construct_argv(char *); 158 void start_window_system(session_t *); 159 void collect_child(pid_t); 160 pid_t start_getty(session_t *); 161 void transition_handler(int); 162 void alrm_handler(int); 163 void setsecuritylevel(int); 164 int getsecuritylevel(void); 165 char *get_chroot(void); 166 int setupargv(session_t *, struct ttyent *); 167 #ifdef LOGIN_CAP 168 void setprocresources(const char *); 169 #endif 170 int clang; 171 172 void clear_session_logs(session_t *); 173 174 int start_session_db(void); 175 void add_session(session_t *); 176 void del_session(session_t *); 177 session_t *find_session(pid_t); 178 DB *session_db; 179 180 /* 181 * The mother of all processes. 182 */ 183 int 184 main(int argc, char **argv) 185 { 186 char *init_chroot; 187 int c; 188 struct sigaction sa; 189 sigset_t mask; 190 struct stat sts; 191 192 193 /* Dispose of random users. */ 194 if (getuid() != 0) 195 errx(1, "%s", strerror(EPERM)); 196 197 /* System V users like to reexec init. */ 198 if (getpid() != 1) { 199 #ifdef COMPAT_SYSV_INIT 200 /* So give them what they want */ 201 if (argc > 1) { 202 if (strlen(argv[1]) == 1) { 203 register char runlevel = *argv[1]; 204 register int sig; 205 206 switch (runlevel) { 207 case '0': /* halt + poweroff */ 208 sig = SIGUSR2; 209 break; 210 case '1': /* single-user */ 211 sig = SIGTERM; 212 break; 213 case '6': /* reboot */ 214 sig = SIGINT; 215 break; 216 case 'c': /* block further logins */ 217 sig = SIGTSTP; 218 break; 219 case 'q': /* rescan /etc/ttys */ 220 sig = SIGHUP; 221 break; 222 default: 223 goto invalid; 224 } 225 kill(1, sig); 226 _exit(0); 227 } else 228 invalid: 229 errx(1, "invalid run-level ``%s''", argv[1]); 230 } else 231 #endif 232 errx(1, "already running"); 233 } 234 /* 235 * Note that this does NOT open a file... 236 * Does 'init' deserve its own facility number? 237 */ 238 openlog("init", LOG_CONS|LOG_ODELAY, LOG_AUTH); 239 240 /* 241 * If chroot has been requested by the boot loader, 242 * do it now. Try to be robust: If the directory 243 * doesn't exist, continue anyway. 244 */ 245 init_chroot = get_chroot(); 246 if (init_chroot != NULL) { 247 if (chdir(init_chroot) == -1 || chroot(".") == -1) 248 warning("can't chroot to %s: %m", init_chroot); 249 free(init_chroot); 250 } 251 252 /* 253 * Create an initial session. 254 */ 255 if (setsid() < 0) 256 warning("initial setsid() failed: %m"); 257 258 /* 259 * Establish an initial user so that programs running 260 * single user do not freak out and die (like passwd). 261 */ 262 if (setlogin("root") < 0) 263 warning("setlogin() failed: %m"); 264 265 if (stat("/dev/null", &sts) < 0) { 266 warning("/dev MAY BE CORRUPT! /dev/null is missing!\n"); 267 sleep(5); 268 } 269 270 /* 271 * This code assumes that we always get arguments through flags, 272 * never through bits set in some random machine register. 273 */ 274 while ((c = getopt(argc, argv, "dsf")) != -1) 275 switch (c) { 276 case 'd': 277 /* We don't support DEVFS. */ 278 break; 279 case 's': 280 requested_transition = single_user; 281 break; 282 case 'f': 283 runcom_mode = FASTBOOT; 284 break; 285 default: 286 warning("unrecognized flag '-%c'", c); 287 break; 288 } 289 290 if (optind != argc) 291 warning("ignoring excess arguments"); 292 293 /* 294 * We catch or block signals rather than ignore them, 295 * so that they get reset on exec. 296 */ 297 handle(badsys, SIGSYS, 0); 298 handle(disaster, SIGABRT, SIGFPE, SIGILL, SIGSEGV, 299 SIGBUS, SIGXCPU, SIGXFSZ, 0); 300 handle(transition_handler, SIGHUP, SIGINT, SIGTERM, SIGTSTP, 301 SIGUSR1, SIGUSR2, 0); 302 handle(alrm_handler, SIGALRM, 0); 303 sigfillset(&mask); 304 delset(&mask, SIGABRT, SIGFPE, SIGILL, SIGSEGV, SIGBUS, SIGSYS, 305 SIGXCPU, SIGXFSZ, SIGHUP, SIGINT, SIGTERM, SIGTSTP, SIGALRM, 306 SIGUSR1, SIGUSR2, 0); 307 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0); 308 sigemptyset(&sa.sa_mask); 309 sa.sa_flags = 0; 310 sa.sa_handler = SIG_IGN; 311 sigaction(SIGTTIN, &sa, (struct sigaction *)0); 312 sigaction(SIGTTOU, &sa, (struct sigaction *)0); 313 314 /* 315 * Paranoia. 316 */ 317 close(0); 318 close(1); 319 close(2); 320 321 /* 322 * Start the state machine. 323 */ 324 transition(requested_transition); 325 326 /* 327 * Should never reach here. 328 */ 329 return 1; 330 } 331 332 /* 333 * Associate a function with a signal handler. 334 */ 335 void 336 handle(sig_t handler, ...) 337 { 338 int sig; 339 struct sigaction sa; 340 sigset_t mask_everything; 341 va_list ap; 342 343 va_start(ap, handler); 344 345 sa.sa_handler = handler; 346 sigfillset(&mask_everything); 347 348 while ((sig = va_arg(ap, int)) != NULL) { 349 sa.sa_mask = mask_everything; 350 /* XXX SA_RESTART? */ 351 sa.sa_flags = sig == SIGCHLD ? SA_NOCLDSTOP : 0; 352 sigaction(sig, &sa, (struct sigaction *) 0); 353 } 354 va_end(ap); 355 } 356 357 /* 358 * Delete a set of signals from a mask. 359 */ 360 void 361 delset(sigset_t *maskp, ...) 362 { 363 int sig; 364 va_list ap; 365 366 va_start(ap, maskp); 367 368 while ((sig = va_arg(ap, int)) != NULL) 369 sigdelset(maskp, sig); 370 va_end(ap); 371 } 372 373 /* 374 * Log a message and sleep for a while (to give someone an opportunity 375 * to read it and to save log or hardcopy output if the problem is chronic). 376 * NB: should send a message to the session logger to avoid blocking. 377 */ 378 void 379 stall(char *message, ...) 380 { 381 va_list ap; 382 383 va_start(ap, message); 384 385 vsyslog(LOG_ALERT, message, ap); 386 va_end(ap); 387 sleep(STALL_TIMEOUT); 388 } 389 390 /* 391 * Like stall(), but doesn't sleep. 392 * If cpp had variadic macros, the two functions could be #defines for another. 393 * NB: should send a message to the session logger to avoid blocking. 394 */ 395 void 396 warning(char *message, ...) 397 { 398 va_list ap; 399 400 va_start(ap, message); 401 402 vsyslog(LOG_ALERT, message, ap); 403 va_end(ap); 404 } 405 406 /* 407 * Log an emergency message. 408 * NB: should send a message to the session logger to avoid blocking. 409 */ 410 void 411 emergency(char *message, ...) 412 { 413 va_list ap; 414 415 va_start(ap, message); 416 417 vsyslog(LOG_EMERG, message, ap); 418 va_end(ap); 419 } 420 421 /* 422 * Catch a SIGSYS signal. 423 * 424 * These may arise if a system does not support sysctl. 425 * We tolerate up to 25 of these, then throw in the towel. 426 */ 427 void 428 badsys(int sig) 429 { 430 static int badcount = 0; 431 432 if (badcount++ < 25) 433 return; 434 disaster(sig); 435 } 436 437 /* 438 * Catch an unexpected signal. 439 */ 440 void 441 disaster(int sig) 442 { 443 emergency("fatal signal: %s", 444 (unsigned)sig < NSIG ? sys_siglist[sig] : "unknown signal"); 445 446 sleep(STALL_TIMEOUT); 447 _exit(sig); /* reboot */ 448 } 449 450 /* 451 * Get the security level of the kernel. 452 */ 453 int 454 getsecuritylevel(void) 455 { 456 #ifdef KERN_SECURELVL 457 int name[2], curlevel; 458 size_t len; 459 460 name[0] = CTL_KERN; 461 name[1] = KERN_SECURELVL; 462 len = sizeof curlevel; 463 if (sysctl(name, 2, &curlevel, &len, NULL, 0) == -1) { 464 emergency("cannot get kernel security level: %s", 465 strerror(errno)); 466 return (-1); 467 } 468 return (curlevel); 469 #else 470 return (-1); 471 #endif 472 } 473 474 /* 475 * Get the value of the "init_chroot" variable from the 476 * kernel environment (or NULL if not set). 477 * (Most of this has been copied from src/usr.bin/kenv/kenv.c.) 478 */ 479 char * 480 get_chroot(void) 481 { 482 const char * const ichname = "init_chroot="; /* includes '=' */ 483 const int ichlen = strlen(ichname); 484 int real_oid[CTL_MAXNAME+4]; 485 int n2oid_oid[2]; 486 char sbuf[1024]; 487 size_t oidlen; 488 char *name; 489 char *res; 490 int slen; 491 int i; 492 493 n2oid_oid[0] = 0; /* This is magic & undocumented! */ 494 n2oid_oid[1] = 3; 495 oidlen = sizeof(real_oid); 496 name = "kern.environment"; 497 498 if (sysctl(n2oid_oid, 2, real_oid, &oidlen, name, strlen(name)) < 0) { 499 warning("cannot find kern.environment base sysctl OID"); 500 return NULL; 501 } 502 oidlen /= sizeof(int); 503 if (oidlen >= CTL_MAXNAME) { 504 warning("kern.environment OID is too large!"); 505 return NULL; 506 } 507 res = NULL; 508 real_oid[oidlen] = 0; 509 510 for (i = 0; ; i++) { 511 real_oid[oidlen + 1] = i; 512 slen = sizeof(sbuf); 513 if (sysctl(real_oid, oidlen + 2, sbuf, &slen, NULL, 0) < 0) { 514 if (errno != ENOENT) 515 warning("sysctl kern.environment.%d: %m", i); 516 break; 517 } 518 519 /* 520 * slen includes the terminating \0, but do a few sanity 521 * checks anyway. 522 */ 523 if (slen == 0) 524 continue; 525 sbuf[slen - 1] = 0; 526 if (strncmp(sbuf, ichname, ichlen) != 0) 527 continue; 528 if (sbuf[ichlen]) 529 res = strdup(sbuf + ichlen); 530 break; 531 } 532 return (res); 533 } 534 535 /* 536 * Set the security level of the kernel. 537 */ 538 void 539 setsecuritylevel(int newlevel) 540 { 541 #ifdef KERN_SECURELVL 542 int name[2], curlevel; 543 544 curlevel = getsecuritylevel(); 545 if (newlevel == curlevel) 546 return; 547 name[0] = CTL_KERN; 548 name[1] = KERN_SECURELVL; 549 if (sysctl(name, 2, NULL, NULL, &newlevel, sizeof newlevel) == -1) { 550 emergency( 551 "cannot change kernel security level from %d to %d: %s", 552 curlevel, newlevel, strerror(errno)); 553 return; 554 } 555 #ifdef SECURE 556 warning("kernel security level changed from %d to %d", 557 curlevel, newlevel); 558 #endif 559 #endif 560 } 561 562 /* 563 * Change states in the finite state machine. 564 * The initial state is passed as an argument. 565 */ 566 void 567 transition(state_t s) 568 { 569 for (;;) 570 s = (state_t) (*s)(); 571 } 572 573 /* 574 * Close out the accounting files for a login session. 575 * NB: should send a message to the session logger to avoid blocking. 576 */ 577 void 578 clear_session_logs(session_t *sp) 579 { 580 char *line = sp->se_device + sizeof(_PATH_DEV) - 1; 581 582 if (logout(line)) 583 logwtmp(line, "", ""); 584 } 585 586 /* 587 * Start a session and allocate a controlling terminal. 588 * Only called by children of init after forking. 589 */ 590 void 591 setctty(char *name) 592 { 593 int fd; 594 595 revoke(name); 596 if ((fd = open(name, O_RDWR)) == -1) { 597 stall("can't open %s: %m", name); 598 _exit(1); 599 } 600 if (login_tty(fd) == -1) { 601 stall("can't get %s for controlling terminal: %m", name); 602 _exit(1); 603 } 604 } 605 606 /* 607 * Bring the system up single user. 608 */ 609 state_func_t 610 single_user(void) 611 { 612 pid_t pid, wpid; 613 int status; 614 sigset_t mask; 615 char *shell = _PATH_BSHELL; 616 char *argv[2]; 617 #ifdef SECURE 618 struct ttyent *typ; 619 struct passwd *pp; 620 static const char banner[] = 621 "Enter root password, or ^D to go multi-user\n"; 622 char *clear, *password; 623 #endif 624 #ifdef DEBUGSHELL 625 char altshell[128]; 626 #endif 627 628 if (Reboot) { 629 /* Instead of going single user, let's reboot the machine */ 630 sync(); 631 alarm(2); 632 pause(); 633 reboot(howto); 634 _exit(0); 635 } 636 637 if ((pid = fork()) == 0) { 638 /* 639 * Start the single user session. 640 */ 641 setctty(_PATH_CONSOLE); 642 643 #ifdef SECURE 644 /* 645 * Check the root password. 646 * We don't care if the console is 'on' by default; 647 * it's the only tty that can be 'off' and 'secure'. 648 */ 649 typ = getttynam("console"); 650 pp = getpwnam("root"); 651 if (typ && (typ->ty_status & TTY_SECURE) == 0 && 652 pp && *pp->pw_passwd) { 653 write(2, banner, sizeof banner - 1); 654 for (;;) { 655 clear = getpass("Password:"); 656 if (clear == 0 || *clear == '\0') 657 _exit(0); 658 password = crypt(clear, pp->pw_passwd); 659 bzero(clear, _PASSWORD_LEN); 660 if (strcmp(password, pp->pw_passwd) == 0) 661 break; 662 warning("single-user login failed\n"); 663 } 664 } 665 endttyent(); 666 endpwent(); 667 #endif /* SECURE */ 668 669 #ifdef DEBUGSHELL 670 { 671 char *cp = altshell; 672 int num; 673 674 #define SHREQUEST \ 675 "Enter full pathname of shell or RETURN for " _PATH_BSHELL ": " 676 write(STDERR_FILENO, SHREQUEST, sizeof(SHREQUEST) - 1); 677 while ((num = read(STDIN_FILENO, cp, 1)) != -1 && 678 num != 0 && *cp != '\n' && cp < &altshell[127]) 679 cp++; 680 *cp = '\0'; 681 if (altshell[0] != '\0') 682 shell = altshell; 683 } 684 #endif /* DEBUGSHELL */ 685 686 /* 687 * Unblock signals. 688 * We catch all the interesting ones, 689 * and those are reset to SIG_DFL on exec. 690 */ 691 sigemptyset(&mask); 692 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0); 693 694 /* 695 * Fire off a shell. 696 * If the default one doesn't work, try the Bourne shell. 697 */ 698 argv[0] = "-sh"; 699 argv[1] = 0; 700 execv(shell, argv); 701 emergency("can't exec %s for single user: %m", shell); 702 execv(_PATH_BSHELL, argv); 703 emergency("can't exec %s for single user: %m", _PATH_BSHELL); 704 sleep(STALL_TIMEOUT); 705 _exit(1); 706 } 707 708 if (pid == -1) { 709 /* 710 * We are seriously hosed. Do our best. 711 */ 712 emergency("can't fork single-user shell, trying again"); 713 while (waitpid(-1, (int *) 0, WNOHANG) > 0) 714 continue; 715 return (state_func_t) single_user; 716 } 717 718 requested_transition = 0; 719 do { 720 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 721 collect_child(wpid); 722 if (wpid == -1) { 723 if (errno == EINTR) 724 continue; 725 warning("wait for single-user shell failed: %m; restarting"); 726 return (state_func_t) single_user; 727 } 728 if (wpid == pid && WIFSTOPPED(status)) { 729 warning("init: shell stopped, restarting\n"); 730 kill(pid, SIGCONT); 731 wpid = -1; 732 } 733 } while (wpid != pid && !requested_transition); 734 735 if (requested_transition) 736 return (state_func_t) requested_transition; 737 738 if (!WIFEXITED(status)) { 739 if (WTERMSIG(status) == SIGKILL) { 740 /* 741 * reboot(8) killed shell? 742 */ 743 warning("single user shell terminated."); 744 sleep(STALL_TIMEOUT); 745 _exit(0); 746 } else { 747 warning("single user shell terminated, restarting"); 748 return (state_func_t) single_user; 749 } 750 } 751 752 runcom_mode = FASTBOOT; 753 return (state_func_t) runcom; 754 } 755 756 /* 757 * Run the system startup script. 758 */ 759 state_func_t 760 runcom(void) 761 { 762 pid_t pid, wpid; 763 int status; 764 char *argv[4]; 765 struct sigaction sa; 766 767 if ((pid = fork()) == 0) { 768 sigemptyset(&sa.sa_mask); 769 sa.sa_flags = 0; 770 sa.sa_handler = SIG_IGN; 771 sigaction(SIGTSTP, &sa, (struct sigaction *)0); 772 sigaction(SIGHUP, &sa, (struct sigaction *)0); 773 774 setctty(_PATH_CONSOLE); 775 776 argv[0] = "sh"; 777 argv[1] = _PATH_RUNCOM; 778 argv[2] = runcom_mode == AUTOBOOT ? "autoboot" : 0; 779 argv[3] = 0; 780 781 sigprocmask(SIG_SETMASK, &sa.sa_mask, (sigset_t *) 0); 782 783 #ifdef LOGIN_CAP 784 setprocresources(RESOURCE_RC); 785 #endif 786 execv(_PATH_BSHELL, argv); 787 stall("can't exec %s for %s: %m", _PATH_BSHELL, _PATH_RUNCOM); 788 _exit(1); /* force single user mode */ 789 } 790 791 if (pid == -1) { 792 emergency("can't fork for %s on %s: %m", 793 _PATH_BSHELL, _PATH_RUNCOM); 794 while (waitpid(-1, (int *) 0, WNOHANG) > 0) 795 continue; 796 sleep(STALL_TIMEOUT); 797 return (state_func_t) single_user; 798 } 799 800 /* 801 * Copied from single_user(). This is a bit paranoid. 802 */ 803 requested_transition = 0; 804 do { 805 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 806 collect_child(wpid); 807 if (wpid == -1) { 808 if (requested_transition == death) 809 return (state_func_t) death; 810 if (errno == EINTR) 811 continue; 812 warning("wait for %s on %s failed: %m; going to single user mode", 813 _PATH_BSHELL, _PATH_RUNCOM); 814 return (state_func_t) single_user; 815 } 816 if (wpid == pid && WIFSTOPPED(status)) { 817 warning("init: %s on %s stopped, restarting\n", 818 _PATH_BSHELL, _PATH_RUNCOM); 819 kill(pid, SIGCONT); 820 wpid = -1; 821 } 822 } while (wpid != pid); 823 824 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGTERM && 825 requested_transition == catatonia) { 826 /* /etc/rc executed /sbin/reboot; wait for the end quietly */ 827 sigset_t s; 828 829 sigfillset(&s); 830 for (;;) 831 sigsuspend(&s); 832 } 833 834 if (!WIFEXITED(status)) { 835 warning("%s on %s terminated abnormally, going to single user mode", 836 _PATH_BSHELL, _PATH_RUNCOM); 837 return (state_func_t) single_user; 838 } 839 840 if (WEXITSTATUS(status)) 841 return (state_func_t) single_user; 842 843 runcom_mode = AUTOBOOT; /* the default */ 844 /* NB: should send a message to the session logger to avoid blocking. */ 845 logwtmp("~", "reboot", ""); 846 return (state_func_t) read_ttys; 847 } 848 849 /* 850 * Open the session database. 851 * 852 * NB: We could pass in the size here; is it necessary? 853 */ 854 int 855 start_session_db(void) 856 { 857 if (session_db && (*session_db->close)(session_db)) 858 emergency("session database close: %s", strerror(errno)); 859 if ((session_db = dbopen(NULL, O_RDWR, 0, DB_HASH, NULL)) == 0) { 860 emergency("session database open: %s", strerror(errno)); 861 return (1); 862 } 863 return (0); 864 865 } 866 867 /* 868 * Add a new login session. 869 */ 870 void 871 add_session(session_t *sp) 872 { 873 DBT key; 874 DBT data; 875 876 key.data = &sp->se_process; 877 key.size = sizeof sp->se_process; 878 data.data = &sp; 879 data.size = sizeof sp; 880 881 if ((*session_db->put)(session_db, &key, &data, 0)) 882 emergency("insert %d: %s", sp->se_process, strerror(errno)); 883 } 884 885 /* 886 * Delete an old login session. 887 */ 888 void 889 del_session(session_t *sp) 890 { 891 DBT key; 892 893 key.data = &sp->se_process; 894 key.size = sizeof sp->se_process; 895 896 if ((*session_db->del)(session_db, &key, 0)) 897 emergency("delete %d: %s", sp->se_process, strerror(errno)); 898 } 899 900 /* 901 * Look up a login session by pid. 902 */ 903 session_t * 904 find_session(pid_t pid) 905 { 906 DBT key; 907 DBT data; 908 session_t *ret; 909 910 key.data = &pid; 911 key.size = sizeof pid; 912 if ((*session_db->get)(session_db, &key, &data, 0) != 0) 913 return 0; 914 bcopy(data.data, (char *)&ret, sizeof(ret)); 915 return ret; 916 } 917 918 /* 919 * Construct an argument vector from a command line. 920 */ 921 char ** 922 construct_argv(char *command) 923 { 924 char *strk (char *); 925 register int argc = 0; 926 register char **argv = (char **) malloc(((strlen(command) + 1) / 2 + 1) 927 * sizeof (char *)); 928 929 if ((argv[argc++] = strk(command)) == 0) { 930 free(argv); 931 return (NULL); 932 } 933 while ((argv[argc++] = strk((char *) 0)) != NULL) 934 continue; 935 return argv; 936 } 937 938 /* 939 * Deallocate a session descriptor. 940 */ 941 void 942 free_session(register session_t *sp) 943 { 944 free(sp->se_device); 945 if (sp->se_getty) { 946 free(sp->se_getty); 947 free(sp->se_getty_argv_space); 948 free(sp->se_getty_argv); 949 } 950 if (sp->se_window) { 951 free(sp->se_window); 952 free(sp->se_window_argv_space); 953 free(sp->se_window_argv); 954 } 955 if (sp->se_type) 956 free(sp->se_type); 957 free(sp); 958 } 959 960 /* 961 * Allocate a new session descriptor. 962 * Mark it SE_PRESENT. 963 */ 964 session_t * 965 new_session(session_t *sprev, int session_index, register struct ttyent *typ) 966 { 967 register session_t *sp; 968 int fd; 969 970 if ((typ->ty_status & TTY_ON) == 0 || 971 typ->ty_name == 0 || 972 typ->ty_getty == 0) 973 return 0; 974 975 sp = (session_t *) calloc(1, sizeof (session_t)); 976 977 sp->se_index = session_index; 978 sp->se_flags |= SE_PRESENT; 979 980 sp->se_device = malloc(sizeof(_PATH_DEV) + strlen(typ->ty_name)); 981 sprintf(sp->se_device, "%s%s", _PATH_DEV, typ->ty_name); 982 983 /* 984 * Attempt to open the device, if we get "device not configured" 985 * then don't add the device to the session list. 986 */ 987 if ((fd = open(sp->se_device, O_RDONLY | O_NONBLOCK, 0)) < 0) { 988 if (errno == ENXIO) { 989 free_session(sp); 990 return (0); 991 } 992 } else 993 close(fd); 994 995 if (setupargv(sp, typ) == 0) { 996 free_session(sp); 997 return (0); 998 } 999 1000 sp->se_next = 0; 1001 if (sprev == 0) { 1002 sessions = sp; 1003 sp->se_prev = 0; 1004 } else { 1005 sprev->se_next = sp; 1006 sp->se_prev = sprev; 1007 } 1008 1009 return sp; 1010 } 1011 1012 /* 1013 * Calculate getty and if useful window argv vectors. 1014 */ 1015 int 1016 setupargv(session_t *sp, struct ttyent *typ) 1017 { 1018 1019 if (sp->se_getty) { 1020 free(sp->se_getty); 1021 free(sp->se_getty_argv_space); 1022 free(sp->se_getty_argv); 1023 } 1024 sp->se_getty = malloc(strlen(typ->ty_getty) + strlen(typ->ty_name) + 2); 1025 sprintf(sp->se_getty, "%s %s", typ->ty_getty, typ->ty_name); 1026 sp->se_getty_argv_space = strdup(sp->se_getty); 1027 sp->se_getty_argv = construct_argv(sp->se_getty_argv_space); 1028 if (sp->se_getty_argv == 0) { 1029 warning("can't parse getty for port %s", sp->se_device); 1030 free(sp->se_getty); 1031 free(sp->se_getty_argv_space); 1032 sp->se_getty = sp->se_getty_argv_space = 0; 1033 return (0); 1034 } 1035 if (sp->se_window) { 1036 free(sp->se_window); 1037 free(sp->se_window_argv_space); 1038 free(sp->se_window_argv); 1039 } 1040 sp->se_window = sp->se_window_argv_space = 0; 1041 sp->se_window_argv = 0; 1042 if (typ->ty_window) { 1043 sp->se_window = strdup(typ->ty_window); 1044 sp->se_window_argv_space = strdup(sp->se_window); 1045 sp->se_window_argv = construct_argv(sp->se_window_argv_space); 1046 if (sp->se_window_argv == 0) { 1047 warning("can't parse window for port %s", 1048 sp->se_device); 1049 free(sp->se_window_argv_space); 1050 free(sp->se_window); 1051 sp->se_window = sp->se_window_argv_space = 0; 1052 return (0); 1053 } 1054 } 1055 if (sp->se_type) 1056 free(sp->se_type); 1057 sp->se_type = typ->ty_type ? strdup(typ->ty_type) : 0; 1058 return (1); 1059 } 1060 1061 /* 1062 * Walk the list of ttys and create sessions for each active line. 1063 */ 1064 state_func_t 1065 read_ttys(void) 1066 { 1067 int session_index = 0; 1068 register session_t *sp, *snext; 1069 register struct ttyent *typ; 1070 1071 /* 1072 * Destroy any previous session state. 1073 * There shouldn't be any, but just in case... 1074 */ 1075 for (sp = sessions; sp; sp = snext) { 1076 if (sp->se_process) 1077 clear_session_logs(sp); 1078 snext = sp->se_next; 1079 free_session(sp); 1080 } 1081 sessions = 0; 1082 if (start_session_db()) 1083 return (state_func_t) single_user; 1084 1085 /* 1086 * Allocate a session entry for each active port. 1087 * Note that sp starts at 0. 1088 */ 1089 while ((typ = getttyent()) != NULL) 1090 if ((snext = new_session(sp, ++session_index, typ)) != NULL) 1091 sp = snext; 1092 1093 endttyent(); 1094 1095 return (state_func_t) multi_user; 1096 } 1097 1098 /* 1099 * Start a window system running. 1100 */ 1101 void 1102 start_window_system(session_t *sp) 1103 { 1104 pid_t pid; 1105 sigset_t mask; 1106 char term[64], *env[2]; 1107 1108 if ((pid = fork()) == -1) { 1109 emergency("can't fork for window system on port %s: %m", 1110 sp->se_device); 1111 /* hope that getty fails and we can try again */ 1112 return; 1113 } 1114 1115 if (pid) 1116 return; 1117 1118 sigemptyset(&mask); 1119 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0); 1120 1121 if (setsid() < 0) 1122 emergency("setsid failed (window) %m"); 1123 1124 #ifdef LOGIN_CAP 1125 setprocresources(RESOURCE_WINDOW); 1126 #endif 1127 if (sp->se_type) { 1128 /* Don't use malloc after fork */ 1129 strcpy(term, "TERM="); 1130 strncat(term, sp->se_type, sizeof(term) - 6); 1131 env[0] = term; 1132 env[1] = 0; 1133 } 1134 else 1135 env[0] = 0; 1136 execve(sp->se_window_argv[0], sp->se_window_argv, env); 1137 stall("can't exec window system '%s' for port %s: %m", 1138 sp->se_window_argv[0], sp->se_device); 1139 _exit(1); 1140 } 1141 1142 /* 1143 * Start a login session running. 1144 */ 1145 pid_t 1146 start_getty(session_t *sp) 1147 { 1148 pid_t pid; 1149 sigset_t mask; 1150 time_t current_time = time((time_t *) 0); 1151 int too_quick = 0; 1152 char term[64], *env[2]; 1153 1154 if (current_time >= sp->se_started && 1155 current_time - sp->se_started < GETTY_SPACING) { 1156 if (++sp->se_nspace > GETTY_NSPACE) { 1157 sp->se_nspace = 0; 1158 too_quick = 1; 1159 } 1160 } else 1161 sp->se_nspace = 0; 1162 1163 /* 1164 * fork(), not vfork() -- we can't afford to block. 1165 */ 1166 if ((pid = fork()) == -1) { 1167 emergency("can't fork for getty on port %s: %m", sp->se_device); 1168 return -1; 1169 } 1170 1171 if (pid) 1172 return pid; 1173 1174 if (too_quick) { 1175 warning("getty repeating too quickly on port %s, sleeping %d secs", 1176 sp->se_device, GETTY_SLEEP); 1177 sleep((unsigned) GETTY_SLEEP); 1178 } 1179 1180 if (sp->se_window) { 1181 start_window_system(sp); 1182 sleep(WINDOW_WAIT); 1183 } 1184 1185 sigemptyset(&mask); 1186 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0); 1187 1188 #ifdef LOGIN_CAP 1189 setprocresources(RESOURCE_GETTY); 1190 #endif 1191 if (sp->se_type) { 1192 /* Don't use malloc after fork */ 1193 strcpy(term, "TERM="); 1194 strncat(term, sp->se_type, sizeof(term) - 6); 1195 env[0] = term; 1196 env[1] = 0; 1197 } 1198 else 1199 env[0] = 0; 1200 execve(sp->se_getty_argv[0], sp->se_getty_argv, env); 1201 stall("can't exec getty '%s' for port %s: %m", 1202 sp->se_getty_argv[0], sp->se_device); 1203 _exit(1); 1204 } 1205 1206 /* 1207 * Collect exit status for a child. 1208 * If an exiting login, start a new login running. 1209 */ 1210 void 1211 collect_child(pid_t pid) 1212 { 1213 register session_t *sp, *sprev, *snext; 1214 1215 if (! sessions) 1216 return; 1217 1218 if (! (sp = find_session(pid))) 1219 return; 1220 1221 clear_session_logs(sp); 1222 del_session(sp); 1223 sp->se_process = 0; 1224 1225 if (sp->se_flags & SE_SHUTDOWN) { 1226 if ((sprev = sp->se_prev) != NULL) 1227 sprev->se_next = sp->se_next; 1228 else 1229 sessions = sp->se_next; 1230 if ((snext = sp->se_next) != NULL) 1231 snext->se_prev = sp->se_prev; 1232 free_session(sp); 1233 return; 1234 } 1235 1236 if ((pid = start_getty(sp)) == -1) { 1237 /* serious trouble */ 1238 requested_transition = clean_ttys; 1239 return; 1240 } 1241 1242 sp->se_process = pid; 1243 sp->se_started = time((time_t *) 0); 1244 add_session(sp); 1245 } 1246 1247 /* 1248 * Catch a signal and request a state transition. 1249 */ 1250 void 1251 transition_handler(int sig) 1252 { 1253 1254 switch (sig) { 1255 case SIGHUP: 1256 requested_transition = clean_ttys; 1257 break; 1258 case SIGUSR2: 1259 howto = RB_POWEROFF; 1260 case SIGUSR1: 1261 howto |= RB_HALT; 1262 case SIGINT: 1263 Reboot = TRUE; 1264 case SIGTERM: 1265 requested_transition = death; 1266 break; 1267 case SIGTSTP: 1268 requested_transition = catatonia; 1269 break; 1270 default: 1271 requested_transition = 0; 1272 break; 1273 } 1274 } 1275 1276 /* 1277 * Take the system multiuser. 1278 */ 1279 state_func_t 1280 multi_user(void) 1281 { 1282 pid_t pid; 1283 register session_t *sp; 1284 1285 requested_transition = 0; 1286 1287 /* 1288 * If the administrator has not set the security level to -1 1289 * to indicate that the kernel should not run multiuser in secure 1290 * mode, and the run script has not set a higher level of security 1291 * than level 1, then put the kernel into secure mode. 1292 */ 1293 if (getsecuritylevel() == 0) 1294 setsecuritylevel(1); 1295 1296 for (sp = sessions; sp; sp = sp->se_next) { 1297 if (sp->se_process) 1298 continue; 1299 if ((pid = start_getty(sp)) == -1) { 1300 /* serious trouble */ 1301 requested_transition = clean_ttys; 1302 break; 1303 } 1304 sp->se_process = pid; 1305 sp->se_started = time((time_t *) 0); 1306 add_session(sp); 1307 } 1308 1309 while (!requested_transition) 1310 if ((pid = waitpid(-1, (int *) 0, 0)) != -1) 1311 collect_child(pid); 1312 1313 return (state_func_t) requested_transition; 1314 } 1315 1316 /* 1317 * This is an (n*2)+(n^2) algorithm. We hope it isn't run often... 1318 */ 1319 state_func_t 1320 clean_ttys(void) 1321 { 1322 register session_t *sp, *sprev; 1323 register struct ttyent *typ; 1324 register int session_index = 0; 1325 register int devlen; 1326 char *old_getty, *old_window, *old_type; 1327 1328 if (! sessions) 1329 return (state_func_t) multi_user; 1330 1331 /* 1332 * mark all sessions for death, (!SE_PRESENT) 1333 * as we find or create new ones they'll be marked as keepers, 1334 * we'll later nuke all the ones not found in /etc/ttys 1335 */ 1336 for (sp = sessions; sp != NULL; sp = sp->se_next) 1337 sp->se_flags &= ~SE_PRESENT; 1338 1339 devlen = sizeof(_PATH_DEV) - 1; 1340 while ((typ = getttyent()) != NULL) { 1341 ++session_index; 1342 1343 for (sprev = 0, sp = sessions; sp; sprev = sp, sp = sp->se_next) 1344 if (strcmp(typ->ty_name, sp->se_device + devlen) == 0) 1345 break; 1346 1347 if (sp) { 1348 /* we want this one to live */ 1349 sp->se_flags |= SE_PRESENT; 1350 if (sp->se_index != session_index) { 1351 warning("port %s changed utmp index from %d to %d", 1352 sp->se_device, sp->se_index, 1353 session_index); 1354 sp->se_index = session_index; 1355 } 1356 if ((typ->ty_status & TTY_ON) == 0 || 1357 typ->ty_getty == 0) { 1358 sp->se_flags |= SE_SHUTDOWN; 1359 kill(sp->se_process, SIGHUP); 1360 continue; 1361 } 1362 sp->se_flags &= ~SE_SHUTDOWN; 1363 old_getty = sp->se_getty ? strdup(sp->se_getty) : 0; 1364 old_window = sp->se_window ? strdup(sp->se_window) : 0; 1365 old_type = sp->se_type ? strdup(sp->se_type) : 0; 1366 if (setupargv(sp, typ) == 0) { 1367 warning("can't parse getty for port %s", 1368 sp->se_device); 1369 sp->se_flags |= SE_SHUTDOWN; 1370 kill(sp->se_process, SIGHUP); 1371 } 1372 else if ( !old_getty 1373 || (!old_type && sp->se_type) 1374 || (old_type && !sp->se_type) 1375 || (!old_window && sp->se_window) 1376 || (old_window && !sp->se_window) 1377 || (strcmp(old_getty, sp->se_getty) != 0) 1378 || (old_window && strcmp(old_window, sp->se_window) != 0) 1379 || (old_type && strcmp(old_type, sp->se_type) != 0) 1380 ) { 1381 /* Don't set SE_SHUTDOWN here */ 1382 sp->se_nspace = 0; 1383 sp->se_started = 0; 1384 kill(sp->se_process, SIGHUP); 1385 } 1386 if (old_getty) 1387 free(old_getty); 1388 if (old_window) 1389 free(old_window); 1390 if (old_type) 1391 free(old_type); 1392 continue; 1393 } 1394 1395 new_session(sprev, session_index, typ); 1396 } 1397 1398 endttyent(); 1399 1400 /* 1401 * sweep through and kill all deleted sessions 1402 * ones who's /etc/ttys line was deleted (SE_PRESENT unset) 1403 */ 1404 for (sp = sessions; sp != NULL; sp = sp->se_next) { 1405 if ((sp->se_flags & SE_PRESENT) == 0) { 1406 sp->se_flags |= SE_SHUTDOWN; 1407 kill(sp->se_process, SIGHUP); 1408 } 1409 } 1410 1411 return (state_func_t) multi_user; 1412 } 1413 1414 /* 1415 * Block further logins. 1416 */ 1417 state_func_t 1418 catatonia(void) 1419 { 1420 register session_t *sp; 1421 1422 for (sp = sessions; sp; sp = sp->se_next) 1423 sp->se_flags |= SE_SHUTDOWN; 1424 1425 return (state_func_t) multi_user; 1426 } 1427 1428 /* 1429 * Note SIGALRM. 1430 */ 1431 void 1432 alrm_handler(int sig) 1433 { 1434 sig; 1435 clang = 1; 1436 } 1437 1438 /* 1439 * Bring the system down to single user. 1440 */ 1441 state_func_t 1442 death(void) 1443 { 1444 register session_t *sp; 1445 register int i; 1446 pid_t pid; 1447 static const int death_sigs[2] = { SIGTERM, SIGKILL }; 1448 1449 /* NB: should send a message to the session logger to avoid blocking. */ 1450 logwtmp("~", "shutdown", ""); 1451 1452 for (sp = sessions; sp; sp = sp->se_next) { 1453 sp->se_flags |= SE_SHUTDOWN; 1454 kill(sp->se_process, SIGHUP); 1455 } 1456 1457 /* Try to run the rc.shutdown script within a period of time */ 1458 runshutdown(); 1459 1460 for (i = 0; i < 2; ++i) { 1461 if (kill(-1, death_sigs[i]) == -1 && errno == ESRCH) 1462 return (state_func_t) single_user; 1463 1464 clang = 0; 1465 alarm(DEATH_WATCH); 1466 do 1467 if ((pid = waitpid(-1, (int *)0, 0)) != -1) 1468 collect_child(pid); 1469 while (clang == 0 && errno != ECHILD); 1470 1471 if (errno == ECHILD) 1472 return (state_func_t) single_user; 1473 } 1474 1475 warning("some processes would not die; ps axl advised"); 1476 1477 return (state_func_t) single_user; 1478 } 1479 1480 /* 1481 * Run the system shutdown script. 1482 * 1483 * Exit codes: XXX I should document more 1484 * -2 shutdown script terminated abnormally 1485 * -1 fatal error - can't run script 1486 * 0 good. 1487 * >0 some error (exit code) 1488 */ 1489 int 1490 runshutdown(void) 1491 { 1492 pid_t pid, wpid; 1493 int status; 1494 int shutdowntimeout; 1495 size_t len; 1496 char *argv[4]; 1497 struct sigaction sa; 1498 struct stat sb; 1499 1500 /* 1501 * rc.shutdown is optional, so to prevent any unnecessary 1502 * complaints from the shell we simply don't run it if the 1503 * file does not exist. If the stat() here fails for other 1504 * reasons, we'll let the shell complain. 1505 */ 1506 if (stat(_PATH_RUNDOWN, &sb) == -1 && errno == ENOENT) 1507 return 0; 1508 1509 if ((pid = fork()) == 0) { 1510 int fd; 1511 1512 /* Assume that init already grab console as ctty before */ 1513 1514 sigemptyset(&sa.sa_mask); 1515 sa.sa_flags = 0; 1516 sa.sa_handler = SIG_IGN; 1517 sigaction(SIGTSTP, &sa, (struct sigaction *)0); 1518 sigaction(SIGHUP, &sa, (struct sigaction *)0); 1519 1520 if ((fd = open(_PATH_CONSOLE, O_RDWR)) == -1) 1521 warning("can't open %s: %m", _PATH_CONSOLE); 1522 else { 1523 dup2(fd, 0); 1524 dup2(fd, 1); 1525 dup2(fd, 2); 1526 if (fd > 2) 1527 close(fd); 1528 } 1529 1530 /* 1531 * Run the shutdown script. 1532 */ 1533 argv[0] = "sh"; 1534 argv[1] = _PATH_RUNDOWN; 1535 if (Reboot) 1536 argv[2] = "reboot"; 1537 else 1538 argv[2] = "single"; 1539 argv[3] = 0; 1540 1541 sigprocmask(SIG_SETMASK, &sa.sa_mask, (sigset_t *) 0); 1542 1543 #ifdef LOGIN_CAP 1544 setprocresources(RESOURCE_RC); 1545 #endif 1546 execv(_PATH_BSHELL, argv); 1547 warning("can't exec %s for %s: %m", _PATH_BSHELL, _PATH_RUNDOWN); 1548 _exit(1); /* force single user mode */ 1549 } 1550 1551 if (pid == -1) { 1552 emergency("can't fork for %s on %s: %m", 1553 _PATH_BSHELL, _PATH_RUNDOWN); 1554 while (waitpid(-1, (int *) 0, WNOHANG) > 0) 1555 continue; 1556 sleep(STALL_TIMEOUT); 1557 return -1; 1558 } 1559 1560 len = sizeof(shutdowntimeout); 1561 if (sysctlbyname("kern.shutdown_timeout", 1562 &shutdowntimeout, 1563 &len, NULL, 0) == -1 || shutdowntimeout < 2) 1564 shutdowntimeout = DEATH_SCRIPT; 1565 alarm(shutdowntimeout); 1566 clang = 0; 1567 /* 1568 * Copied from single_user(). This is a bit paranoid. 1569 * Use the same ALRM handler. 1570 */ 1571 do { 1572 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 1573 collect_child(wpid); 1574 if (clang == 1) { 1575 /* we were waiting for the sub-shell */ 1576 kill(wpid, SIGTERM); 1577 warning("timeout expired for %s on %s: %m; going to single user mode", 1578 _PATH_BSHELL, _PATH_RUNDOWN); 1579 return -1; 1580 } 1581 if (wpid == -1) { 1582 if (errno == EINTR) 1583 continue; 1584 warning("wait for %s on %s failed: %m; going to single user mode", 1585 _PATH_BSHELL, _PATH_RUNDOWN); 1586 return -1; 1587 } 1588 if (wpid == pid && WIFSTOPPED(status)) { 1589 warning("init: %s on %s stopped, restarting\n", 1590 _PATH_BSHELL, _PATH_RUNDOWN); 1591 kill(pid, SIGCONT); 1592 wpid = -1; 1593 } 1594 } while (wpid != pid && !clang); 1595 1596 /* Turn off the alarm */ 1597 alarm(0); 1598 1599 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGTERM && 1600 requested_transition == catatonia) { 1601 /* 1602 * /etc/rc.shutdown executed /sbin/reboot; 1603 * wait for the end quietly 1604 */ 1605 sigset_t s; 1606 1607 sigfillset(&s); 1608 for (;;) 1609 sigsuspend(&s); 1610 } 1611 1612 if (!WIFEXITED(status)) { 1613 warning("%s on %s terminated abnormally, going to single user mode", 1614 _PATH_BSHELL, _PATH_RUNDOWN); 1615 return -2; 1616 } 1617 1618 if ((status = WEXITSTATUS(status)) != 0) 1619 warning("%s returned status %d", _PATH_RUNDOWN, status); 1620 1621 return status; 1622 } 1623 1624 char * 1625 strk (char *p) 1626 { 1627 static char *t; 1628 char *q; 1629 int c; 1630 1631 if (p) 1632 t = p; 1633 if (!t) 1634 return 0; 1635 1636 c = *t; 1637 while (c == ' ' || c == '\t' ) 1638 c = *++t; 1639 if (!c) { 1640 t = 0; 1641 return 0; 1642 } 1643 q = t; 1644 if (c == '\'') { 1645 c = *++t; 1646 q = t; 1647 while (c && c != '\'') 1648 c = *++t; 1649 if (!c) /* unterminated string */ 1650 q = t = 0; 1651 else 1652 *t++ = 0; 1653 } else { 1654 while (c && c != ' ' && c != '\t' ) 1655 c = *++t; 1656 *t++ = 0; 1657 if (!c) 1658 t = 0; 1659 } 1660 return q; 1661 } 1662 1663 #ifdef LOGIN_CAP 1664 void 1665 setprocresources(const char *cname) 1666 { 1667 login_cap_t *lc; 1668 if ((lc = login_getclassbyname(cname, NULL)) != NULL) { 1669 setusercontext(lc, (struct passwd*)NULL, 0, LOGIN_SETPRIORITY|LOGIN_SETRESOURCES); 1670 login_close(lc); 1671 } 1672 } 1673 #endif 1674