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 1.6 2004/11/20 04:09:34 dillon 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 (void) sigaction(SIGTTIN, &sa, (struct sigaction *)0); 312 (void) 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 (void) 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 (void)write(STDERR_FILENO, 677 SHREQUEST, sizeof(SHREQUEST) - 1); 678 while ((num = read(STDIN_FILENO, cp, 1)) != -1 && 679 num != 0 && *cp != '\n' && cp < &altshell[127]) 680 cp++; 681 *cp = '\0'; 682 if (altshell[0] != '\0') 683 shell = altshell; 684 } 685 #endif /* DEBUGSHELL */ 686 687 /* 688 * Unblock signals. 689 * We catch all the interesting ones, 690 * and those are reset to SIG_DFL on exec. 691 */ 692 sigemptyset(&mask); 693 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0); 694 695 /* 696 * Fire off a shell. 697 * If the default one doesn't work, try the Bourne shell. 698 */ 699 argv[0] = "-sh"; 700 argv[1] = 0; 701 execv(shell, argv); 702 emergency("can't exec %s for single user: %m", shell); 703 execv(_PATH_BSHELL, argv); 704 emergency("can't exec %s for single user: %m", _PATH_BSHELL); 705 sleep(STALL_TIMEOUT); 706 _exit(1); 707 } 708 709 if (pid == -1) { 710 /* 711 * We are seriously hosed. Do our best. 712 */ 713 emergency("can't fork single-user shell, trying again"); 714 while (waitpid(-1, (int *) 0, WNOHANG) > 0) 715 continue; 716 return (state_func_t) single_user; 717 } 718 719 requested_transition = 0; 720 do { 721 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 722 collect_child(wpid); 723 if (wpid == -1) { 724 if (errno == EINTR) 725 continue; 726 warning("wait for single-user shell failed: %m; restarting"); 727 return (state_func_t) single_user; 728 } 729 if (wpid == pid && WIFSTOPPED(status)) { 730 warning("init: shell stopped, restarting\n"); 731 kill(pid, SIGCONT); 732 wpid = -1; 733 } 734 } while (wpid != pid && !requested_transition); 735 736 if (requested_transition) 737 return (state_func_t) requested_transition; 738 739 if (!WIFEXITED(status)) { 740 if (WTERMSIG(status) == SIGKILL) { 741 /* 742 * reboot(8) killed shell? 743 */ 744 warning("single user shell terminated."); 745 sleep(STALL_TIMEOUT); 746 _exit(0); 747 } else { 748 warning("single user shell terminated, restarting"); 749 return (state_func_t) single_user; 750 } 751 } 752 753 runcom_mode = FASTBOOT; 754 return (state_func_t) runcom; 755 } 756 757 /* 758 * Run the system startup script. 759 */ 760 state_func_t 761 runcom(void) 762 { 763 pid_t pid, wpid; 764 int status; 765 char *argv[4]; 766 struct sigaction sa; 767 768 if ((pid = fork()) == 0) { 769 sigemptyset(&sa.sa_mask); 770 sa.sa_flags = 0; 771 sa.sa_handler = SIG_IGN; 772 (void) sigaction(SIGTSTP, &sa, (struct sigaction *)0); 773 (void) sigaction(SIGHUP, &sa, (struct sigaction *)0); 774 775 setctty(_PATH_CONSOLE); 776 777 argv[0] = "sh"; 778 argv[1] = _PATH_RUNCOM; 779 argv[2] = runcom_mode == AUTOBOOT ? "autoboot" : 0; 780 argv[3] = 0; 781 782 sigprocmask(SIG_SETMASK, &sa.sa_mask, (sigset_t *) 0); 783 784 #ifdef LOGIN_CAP 785 setprocresources(RESOURCE_RC); 786 #endif 787 execv(_PATH_BSHELL, argv); 788 stall("can't exec %s for %s: %m", _PATH_BSHELL, _PATH_RUNCOM); 789 _exit(1); /* force single user mode */ 790 } 791 792 if (pid == -1) { 793 emergency("can't fork for %s on %s: %m", 794 _PATH_BSHELL, _PATH_RUNCOM); 795 while (waitpid(-1, (int *) 0, WNOHANG) > 0) 796 continue; 797 sleep(STALL_TIMEOUT); 798 return (state_func_t) single_user; 799 } 800 801 /* 802 * Copied from single_user(). This is a bit paranoid. 803 */ 804 requested_transition = 0; 805 do { 806 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 807 collect_child(wpid); 808 if (wpid == -1) { 809 if (requested_transition == death) 810 return (state_func_t) death; 811 if (errno == EINTR) 812 continue; 813 warning("wait for %s on %s failed: %m; going to single user mode", 814 _PATH_BSHELL, _PATH_RUNCOM); 815 return (state_func_t) single_user; 816 } 817 if (wpid == pid && WIFSTOPPED(status)) { 818 warning("init: %s on %s stopped, restarting\n", 819 _PATH_BSHELL, _PATH_RUNCOM); 820 kill(pid, SIGCONT); 821 wpid = -1; 822 } 823 } while (wpid != pid); 824 825 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGTERM && 826 requested_transition == catatonia) { 827 /* /etc/rc executed /sbin/reboot; wait for the end quietly */ 828 sigset_t s; 829 830 sigfillset(&s); 831 for (;;) 832 sigsuspend(&s); 833 } 834 835 if (!WIFEXITED(status)) { 836 warning("%s on %s terminated abnormally, going to single user mode", 837 _PATH_BSHELL, _PATH_RUNCOM); 838 return (state_func_t) single_user; 839 } 840 841 if (WEXITSTATUS(status)) 842 return (state_func_t) single_user; 843 844 runcom_mode = AUTOBOOT; /* the default */ 845 /* NB: should send a message to the session logger to avoid blocking. */ 846 logwtmp("~", "reboot", ""); 847 return (state_func_t) read_ttys; 848 } 849 850 /* 851 * Open the session database. 852 * 853 * NB: We could pass in the size here; is it necessary? 854 */ 855 int 856 start_session_db(void) 857 { 858 if (session_db && (*session_db->close)(session_db)) 859 emergency("session database close: %s", strerror(errno)); 860 if ((session_db = dbopen(NULL, O_RDWR, 0, DB_HASH, NULL)) == 0) { 861 emergency("session database open: %s", strerror(errno)); 862 return (1); 863 } 864 return (0); 865 866 } 867 868 /* 869 * Add a new login session. 870 */ 871 void 872 add_session(session_t *sp) 873 { 874 DBT key; 875 DBT data; 876 877 key.data = &sp->se_process; 878 key.size = sizeof sp->se_process; 879 data.data = &sp; 880 data.size = sizeof sp; 881 882 if ((*session_db->put)(session_db, &key, &data, 0)) 883 emergency("insert %d: %s", sp->se_process, strerror(errno)); 884 } 885 886 /* 887 * Delete an old login session. 888 */ 889 void 890 del_session(session_t *sp) 891 { 892 DBT key; 893 894 key.data = &sp->se_process; 895 key.size = sizeof sp->se_process; 896 897 if ((*session_db->del)(session_db, &key, 0)) 898 emergency("delete %d: %s", sp->se_process, strerror(errno)); 899 } 900 901 /* 902 * Look up a login session by pid. 903 */ 904 session_t * 905 find_session(pid_t pid) 906 { 907 DBT key; 908 DBT data; 909 session_t *ret; 910 911 key.data = &pid; 912 key.size = sizeof pid; 913 if ((*session_db->get)(session_db, &key, &data, 0) != 0) 914 return 0; 915 bcopy(data.data, (char *)&ret, sizeof(ret)); 916 return ret; 917 } 918 919 /* 920 * Construct an argument vector from a command line. 921 */ 922 char ** 923 construct_argv(char *command) 924 { 925 char *strk (char *); 926 register int argc = 0; 927 register char **argv = (char **) malloc(((strlen(command) + 1) / 2 + 1) 928 * sizeof (char *)); 929 930 if ((argv[argc++] = strk(command)) == 0) { 931 free(argv); 932 return (NULL); 933 } 934 while ((argv[argc++] = strk((char *) 0)) != NULL) 935 continue; 936 return argv; 937 } 938 939 /* 940 * Deallocate a session descriptor. 941 */ 942 void 943 free_session(register session_t *sp) 944 { 945 free(sp->se_device); 946 if (sp->se_getty) { 947 free(sp->se_getty); 948 free(sp->se_getty_argv_space); 949 free(sp->se_getty_argv); 950 } 951 if (sp->se_window) { 952 free(sp->se_window); 953 free(sp->se_window_argv_space); 954 free(sp->se_window_argv); 955 } 956 if (sp->se_type) 957 free(sp->se_type); 958 free(sp); 959 } 960 961 /* 962 * Allocate a new session descriptor. 963 * Mark it SE_PRESENT. 964 */ 965 session_t * 966 new_session(session_t *sprev, int session_index, register struct ttyent *typ) 967 { 968 register session_t *sp; 969 int fd; 970 971 if ((typ->ty_status & TTY_ON) == 0 || 972 typ->ty_name == 0 || 973 typ->ty_getty == 0) 974 return 0; 975 976 sp = (session_t *) calloc(1, sizeof (session_t)); 977 978 sp->se_index = session_index; 979 sp->se_flags |= SE_PRESENT; 980 981 sp->se_device = malloc(sizeof(_PATH_DEV) + strlen(typ->ty_name)); 982 (void) sprintf(sp->se_device, "%s%s", _PATH_DEV, typ->ty_name); 983 984 /* 985 * Attempt to open the device, if we get "device not configured" 986 * then don't add the device to the session list. 987 */ 988 if ((fd = open(sp->se_device, O_RDONLY | O_NONBLOCK, 0)) < 0) { 989 if (errno == ENXIO) { 990 free_session(sp); 991 return (0); 992 } 993 } else 994 close(fd); 995 996 if (setupargv(sp, typ) == 0) { 997 free_session(sp); 998 return (0); 999 } 1000 1001 sp->se_next = 0; 1002 if (sprev == 0) { 1003 sessions = sp; 1004 sp->se_prev = 0; 1005 } else { 1006 sprev->se_next = sp; 1007 sp->se_prev = sprev; 1008 } 1009 1010 return sp; 1011 } 1012 1013 /* 1014 * Calculate getty and if useful window argv vectors. 1015 */ 1016 int 1017 setupargv(session_t *sp, struct ttyent *typ) 1018 { 1019 1020 if (sp->se_getty) { 1021 free(sp->se_getty); 1022 free(sp->se_getty_argv_space); 1023 free(sp->se_getty_argv); 1024 } 1025 sp->se_getty = malloc(strlen(typ->ty_getty) + strlen(typ->ty_name) + 2); 1026 (void) sprintf(sp->se_getty, "%s %s", typ->ty_getty, typ->ty_name); 1027 sp->se_getty_argv_space = strdup(sp->se_getty); 1028 sp->se_getty_argv = construct_argv(sp->se_getty_argv_space); 1029 if (sp->se_getty_argv == 0) { 1030 warning("can't parse getty for port %s", sp->se_device); 1031 free(sp->se_getty); 1032 free(sp->se_getty_argv_space); 1033 sp->se_getty = sp->se_getty_argv_space = 0; 1034 return (0); 1035 } 1036 if (sp->se_window) { 1037 free(sp->se_window); 1038 free(sp->se_window_argv_space); 1039 free(sp->se_window_argv); 1040 } 1041 sp->se_window = sp->se_window_argv_space = 0; 1042 sp->se_window_argv = 0; 1043 if (typ->ty_window) { 1044 sp->se_window = strdup(typ->ty_window); 1045 sp->se_window_argv_space = strdup(sp->se_window); 1046 sp->se_window_argv = construct_argv(sp->se_window_argv_space); 1047 if (sp->se_window_argv == 0) { 1048 warning("can't parse window for port %s", 1049 sp->se_device); 1050 free(sp->se_window_argv_space); 1051 free(sp->se_window); 1052 sp->se_window = sp->se_window_argv_space = 0; 1053 return (0); 1054 } 1055 } 1056 if (sp->se_type) 1057 free(sp->se_type); 1058 sp->se_type = typ->ty_type ? strdup(typ->ty_type) : 0; 1059 return (1); 1060 } 1061 1062 /* 1063 * Walk the list of ttys and create sessions for each active line. 1064 */ 1065 state_func_t 1066 read_ttys(void) 1067 { 1068 int session_index = 0; 1069 register session_t *sp, *snext; 1070 register struct ttyent *typ; 1071 1072 /* 1073 * Destroy any previous session state. 1074 * There shouldn't be any, but just in case... 1075 */ 1076 for (sp = sessions; sp; sp = snext) { 1077 if (sp->se_process) 1078 clear_session_logs(sp); 1079 snext = sp->se_next; 1080 free_session(sp); 1081 } 1082 sessions = 0; 1083 if (start_session_db()) 1084 return (state_func_t) single_user; 1085 1086 /* 1087 * Allocate a session entry for each active port. 1088 * Note that sp starts at 0. 1089 */ 1090 while ((typ = getttyent()) != NULL) 1091 if ((snext = new_session(sp, ++session_index, typ)) != NULL) 1092 sp = snext; 1093 1094 endttyent(); 1095 1096 return (state_func_t) multi_user; 1097 } 1098 1099 /* 1100 * Start a window system running. 1101 */ 1102 void 1103 start_window_system(session_t *sp) 1104 { 1105 pid_t pid; 1106 sigset_t mask; 1107 char term[64], *env[2]; 1108 1109 if ((pid = fork()) == -1) { 1110 emergency("can't fork for window system on port %s: %m", 1111 sp->se_device); 1112 /* hope that getty fails and we can try again */ 1113 return; 1114 } 1115 1116 if (pid) 1117 return; 1118 1119 sigemptyset(&mask); 1120 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0); 1121 1122 if (setsid() < 0) 1123 emergency("setsid failed (window) %m"); 1124 1125 #ifdef LOGIN_CAP 1126 setprocresources(RESOURCE_WINDOW); 1127 #endif 1128 if (sp->se_type) { 1129 /* Don't use malloc after fork */ 1130 strcpy(term, "TERM="); 1131 strncat(term, sp->se_type, sizeof(term) - 6); 1132 env[0] = term; 1133 env[1] = 0; 1134 } 1135 else 1136 env[0] = 0; 1137 execve(sp->se_window_argv[0], sp->se_window_argv, env); 1138 stall("can't exec window system '%s' for port %s: %m", 1139 sp->se_window_argv[0], sp->se_device); 1140 _exit(1); 1141 } 1142 1143 /* 1144 * Start a login session running. 1145 */ 1146 pid_t 1147 start_getty(session_t *sp) 1148 { 1149 pid_t pid; 1150 sigset_t mask; 1151 time_t current_time = time((time_t *) 0); 1152 int too_quick = 0; 1153 char term[64], *env[2]; 1154 1155 if (current_time >= sp->se_started && 1156 current_time - sp->se_started < GETTY_SPACING) { 1157 if (++sp->se_nspace > GETTY_NSPACE) { 1158 sp->se_nspace = 0; 1159 too_quick = 1; 1160 } 1161 } else 1162 sp->se_nspace = 0; 1163 1164 /* 1165 * fork(), not vfork() -- we can't afford to block. 1166 */ 1167 if ((pid = fork()) == -1) { 1168 emergency("can't fork for getty on port %s: %m", sp->se_device); 1169 return -1; 1170 } 1171 1172 if (pid) 1173 return pid; 1174 1175 if (too_quick) { 1176 warning("getty repeating too quickly on port %s, sleeping %d secs", 1177 sp->se_device, GETTY_SLEEP); 1178 sleep((unsigned) GETTY_SLEEP); 1179 } 1180 1181 if (sp->se_window) { 1182 start_window_system(sp); 1183 sleep(WINDOW_WAIT); 1184 } 1185 1186 sigemptyset(&mask); 1187 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0); 1188 1189 #ifdef LOGIN_CAP 1190 setprocresources(RESOURCE_GETTY); 1191 #endif 1192 if (sp->se_type) { 1193 /* Don't use malloc after fork */ 1194 strcpy(term, "TERM="); 1195 strncat(term, sp->se_type, sizeof(term) - 6); 1196 env[0] = term; 1197 env[1] = 0; 1198 } 1199 else 1200 env[0] = 0; 1201 execve(sp->se_getty_argv[0], sp->se_getty_argv, env); 1202 stall("can't exec getty '%s' for port %s: %m", 1203 sp->se_getty_argv[0], sp->se_device); 1204 _exit(1); 1205 } 1206 1207 /* 1208 * Collect exit status for a child. 1209 * If an exiting login, start a new login running. 1210 */ 1211 void 1212 collect_child(pid_t pid) 1213 { 1214 register session_t *sp, *sprev, *snext; 1215 1216 if (! sessions) 1217 return; 1218 1219 if (! (sp = find_session(pid))) 1220 return; 1221 1222 clear_session_logs(sp); 1223 del_session(sp); 1224 sp->se_process = 0; 1225 1226 if (sp->se_flags & SE_SHUTDOWN) { 1227 if ((sprev = sp->se_prev) != NULL) 1228 sprev->se_next = sp->se_next; 1229 else 1230 sessions = sp->se_next; 1231 if ((snext = sp->se_next) != NULL) 1232 snext->se_prev = sp->se_prev; 1233 free_session(sp); 1234 return; 1235 } 1236 1237 if ((pid = start_getty(sp)) == -1) { 1238 /* serious trouble */ 1239 requested_transition = clean_ttys; 1240 return; 1241 } 1242 1243 sp->se_process = pid; 1244 sp->se_started = time((time_t *) 0); 1245 add_session(sp); 1246 } 1247 1248 /* 1249 * Catch a signal and request a state transition. 1250 */ 1251 void 1252 transition_handler(int sig) 1253 { 1254 1255 switch (sig) { 1256 case SIGHUP: 1257 requested_transition = clean_ttys; 1258 break; 1259 case SIGUSR2: 1260 howto = RB_POWEROFF; 1261 case SIGUSR1: 1262 howto |= RB_HALT; 1263 case SIGINT: 1264 Reboot = TRUE; 1265 case SIGTERM: 1266 requested_transition = death; 1267 break; 1268 case SIGTSTP: 1269 requested_transition = catatonia; 1270 break; 1271 default: 1272 requested_transition = 0; 1273 break; 1274 } 1275 } 1276 1277 /* 1278 * Take the system multiuser. 1279 */ 1280 state_func_t 1281 multi_user(void) 1282 { 1283 pid_t pid; 1284 register session_t *sp; 1285 1286 requested_transition = 0; 1287 1288 /* 1289 * If the administrator has not set the security level to -1 1290 * to indicate that the kernel should not run multiuser in secure 1291 * mode, and the run script has not set a higher level of security 1292 * than level 1, then put the kernel into secure mode. 1293 */ 1294 if (getsecuritylevel() == 0) 1295 setsecuritylevel(1); 1296 1297 for (sp = sessions; sp; sp = sp->se_next) { 1298 if (sp->se_process) 1299 continue; 1300 if ((pid = start_getty(sp)) == -1) { 1301 /* serious trouble */ 1302 requested_transition = clean_ttys; 1303 break; 1304 } 1305 sp->se_process = pid; 1306 sp->se_started = time((time_t *) 0); 1307 add_session(sp); 1308 } 1309 1310 while (!requested_transition) 1311 if ((pid = waitpid(-1, (int *) 0, 0)) != -1) 1312 collect_child(pid); 1313 1314 return (state_func_t) requested_transition; 1315 } 1316 1317 /* 1318 * This is an (n*2)+(n^2) algorithm. We hope it isn't run often... 1319 */ 1320 state_func_t 1321 clean_ttys(void) 1322 { 1323 register session_t *sp, *sprev; 1324 register struct ttyent *typ; 1325 register int session_index = 0; 1326 register int devlen; 1327 char *old_getty, *old_window, *old_type; 1328 1329 if (! sessions) 1330 return (state_func_t) multi_user; 1331 1332 /* 1333 * mark all sessions for death, (!SE_PRESENT) 1334 * as we find or create new ones they'll be marked as keepers, 1335 * we'll later nuke all the ones not found in /etc/ttys 1336 */ 1337 for (sp = sessions; sp != NULL; sp = sp->se_next) 1338 sp->se_flags &= ~SE_PRESENT; 1339 1340 devlen = sizeof(_PATH_DEV) - 1; 1341 while ((typ = getttyent()) != NULL) { 1342 ++session_index; 1343 1344 for (sprev = 0, sp = sessions; sp; sprev = sp, sp = sp->se_next) 1345 if (strcmp(typ->ty_name, sp->se_device + devlen) == 0) 1346 break; 1347 1348 if (sp) { 1349 /* we want this one to live */ 1350 sp->se_flags |= SE_PRESENT; 1351 if (sp->se_index != session_index) { 1352 warning("port %s changed utmp index from %d to %d", 1353 sp->se_device, sp->se_index, 1354 session_index); 1355 sp->se_index = session_index; 1356 } 1357 if ((typ->ty_status & TTY_ON) == 0 || 1358 typ->ty_getty == 0) { 1359 sp->se_flags |= SE_SHUTDOWN; 1360 kill(sp->se_process, SIGHUP); 1361 continue; 1362 } 1363 sp->se_flags &= ~SE_SHUTDOWN; 1364 old_getty = sp->se_getty ? strdup(sp->se_getty) : 0; 1365 old_window = sp->se_window ? strdup(sp->se_window) : 0; 1366 old_type = sp->se_type ? strdup(sp->se_type) : 0; 1367 if (setupargv(sp, typ) == 0) { 1368 warning("can't parse getty for port %s", 1369 sp->se_device); 1370 sp->se_flags |= SE_SHUTDOWN; 1371 kill(sp->se_process, SIGHUP); 1372 } 1373 else if ( !old_getty 1374 || (!old_type && sp->se_type) 1375 || (old_type && !sp->se_type) 1376 || (!old_window && sp->se_window) 1377 || (old_window && !sp->se_window) 1378 || (strcmp(old_getty, sp->se_getty) != 0) 1379 || (old_window && strcmp(old_window, sp->se_window) != 0) 1380 || (old_type && strcmp(old_type, sp->se_type) != 0) 1381 ) { 1382 /* Don't set SE_SHUTDOWN here */ 1383 sp->se_nspace = 0; 1384 sp->se_started = 0; 1385 kill(sp->se_process, SIGHUP); 1386 } 1387 if (old_getty) 1388 free(old_getty); 1389 if (old_window) 1390 free(old_window); 1391 if (old_type) 1392 free(old_type); 1393 continue; 1394 } 1395 1396 new_session(sprev, session_index, typ); 1397 } 1398 1399 endttyent(); 1400 1401 /* 1402 * sweep through and kill all deleted sessions 1403 * ones who's /etc/ttys line was deleted (SE_PRESENT unset) 1404 */ 1405 for (sp = sessions; sp != NULL; sp = sp->se_next) { 1406 if ((sp->se_flags & SE_PRESENT) == 0) { 1407 sp->se_flags |= SE_SHUTDOWN; 1408 kill(sp->se_process, SIGHUP); 1409 } 1410 } 1411 1412 return (state_func_t) multi_user; 1413 } 1414 1415 /* 1416 * Block further logins. 1417 */ 1418 state_func_t 1419 catatonia(void) 1420 { 1421 register session_t *sp; 1422 1423 for (sp = sessions; sp; sp = sp->se_next) 1424 sp->se_flags |= SE_SHUTDOWN; 1425 1426 return (state_func_t) multi_user; 1427 } 1428 1429 /* 1430 * Note SIGALRM. 1431 */ 1432 void 1433 alrm_handler(int sig) 1434 { 1435 (void)sig; 1436 clang = 1; 1437 } 1438 1439 /* 1440 * Bring the system down to single user. 1441 */ 1442 state_func_t 1443 death(void) 1444 { 1445 register session_t *sp; 1446 register int i; 1447 pid_t pid; 1448 static const int death_sigs[2] = { SIGTERM, SIGKILL }; 1449 1450 /* NB: should send a message to the session logger to avoid blocking. */ 1451 logwtmp("~", "shutdown", ""); 1452 1453 for (sp = sessions; sp; sp = sp->se_next) { 1454 sp->se_flags |= SE_SHUTDOWN; 1455 kill(sp->se_process, SIGHUP); 1456 } 1457 1458 /* Try to run the rc.shutdown script within a period of time */ 1459 (void) runshutdown(); 1460 1461 for (i = 0; i < 2; ++i) { 1462 if (kill(-1, death_sigs[i]) == -1 && errno == ESRCH) 1463 return (state_func_t) single_user; 1464 1465 clang = 0; 1466 alarm(DEATH_WATCH); 1467 do 1468 if ((pid = waitpid(-1, (int *)0, 0)) != -1) 1469 collect_child(pid); 1470 while (clang == 0 && errno != ECHILD); 1471 1472 if (errno == ECHILD) 1473 return (state_func_t) single_user; 1474 } 1475 1476 warning("some processes would not die; ps axl advised"); 1477 1478 return (state_func_t) single_user; 1479 } 1480 1481 /* 1482 * Run the system shutdown script. 1483 * 1484 * Exit codes: XXX I should document more 1485 * -2 shutdown script terminated abnormally 1486 * -1 fatal error - can't run script 1487 * 0 good. 1488 * >0 some error (exit code) 1489 */ 1490 int 1491 runshutdown(void) 1492 { 1493 pid_t pid, wpid; 1494 int status; 1495 int shutdowntimeout; 1496 size_t len; 1497 char *argv[4]; 1498 struct sigaction sa; 1499 struct stat sb; 1500 1501 /* 1502 * rc.shutdown is optional, so to prevent any unnecessary 1503 * complaints from the shell we simply don't run it if the 1504 * file does not exist. If the stat() here fails for other 1505 * reasons, we'll let the shell complain. 1506 */ 1507 if (stat(_PATH_RUNDOWN, &sb) == -1 && errno == ENOENT) 1508 return 0; 1509 1510 if ((pid = fork()) == 0) { 1511 int fd; 1512 1513 /* Assume that init already grab console as ctty before */ 1514 1515 sigemptyset(&sa.sa_mask); 1516 sa.sa_flags = 0; 1517 sa.sa_handler = SIG_IGN; 1518 (void) sigaction(SIGTSTP, &sa, (struct sigaction *)0); 1519 (void) sigaction(SIGHUP, &sa, (struct sigaction *)0); 1520 1521 if ((fd = open(_PATH_CONSOLE, O_RDWR)) == -1) 1522 warning("can't open %s: %m", _PATH_CONSOLE); 1523 else { 1524 (void) dup2(fd, 0); 1525 (void) dup2(fd, 1); 1526 (void) dup2(fd, 2); 1527 if (fd > 2) 1528 close(fd); 1529 } 1530 1531 /* 1532 * Run the shutdown script. 1533 */ 1534 argv[0] = "sh"; 1535 argv[1] = _PATH_RUNDOWN; 1536 if (Reboot) 1537 argv[2] = "reboot"; 1538 else 1539 argv[2] = "single"; 1540 argv[3] = 0; 1541 1542 sigprocmask(SIG_SETMASK, &sa.sa_mask, (sigset_t *) 0); 1543 1544 #ifdef LOGIN_CAP 1545 setprocresources(RESOURCE_RC); 1546 #endif 1547 execv(_PATH_BSHELL, argv); 1548 warning("can't exec %s for %s: %m", _PATH_BSHELL, _PATH_RUNDOWN); 1549 _exit(1); /* force single user mode */ 1550 } 1551 1552 if (pid == -1) { 1553 emergency("can't fork for %s on %s: %m", 1554 _PATH_BSHELL, _PATH_RUNDOWN); 1555 while (waitpid(-1, (int *) 0, WNOHANG) > 0) 1556 continue; 1557 sleep(STALL_TIMEOUT); 1558 return -1; 1559 } 1560 1561 len = sizeof(shutdowntimeout); 1562 if (sysctlbyname("kern.shutdown_timeout", 1563 &shutdowntimeout, 1564 &len, NULL, 0) == -1 || shutdowntimeout < 2) 1565 shutdowntimeout = DEATH_SCRIPT; 1566 alarm(shutdowntimeout); 1567 clang = 0; 1568 /* 1569 * Copied from single_user(). This is a bit paranoid. 1570 * Use the same ALRM handler. 1571 */ 1572 do { 1573 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1) 1574 collect_child(wpid); 1575 if (clang == 1) { 1576 /* we were waiting for the sub-shell */ 1577 kill(wpid, SIGTERM); 1578 warning("timeout expired for %s on %s: %m; going to single user mode", 1579 _PATH_BSHELL, _PATH_RUNDOWN); 1580 return -1; 1581 } 1582 if (wpid == -1) { 1583 if (errno == EINTR) 1584 continue; 1585 warning("wait for %s on %s failed: %m; going to single user mode", 1586 _PATH_BSHELL, _PATH_RUNDOWN); 1587 return -1; 1588 } 1589 if (wpid == pid && WIFSTOPPED(status)) { 1590 warning("init: %s on %s stopped, restarting\n", 1591 _PATH_BSHELL, _PATH_RUNDOWN); 1592 kill(pid, SIGCONT); 1593 wpid = -1; 1594 } 1595 } while (wpid != pid && !clang); 1596 1597 /* Turn off the alarm */ 1598 alarm(0); 1599 1600 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGTERM && 1601 requested_transition == catatonia) { 1602 /* 1603 * /etc/rc.shutdown executed /sbin/reboot; 1604 * wait for the end quietly 1605 */ 1606 sigset_t s; 1607 1608 sigfillset(&s); 1609 for (;;) 1610 sigsuspend(&s); 1611 } 1612 1613 if (!WIFEXITED(status)) { 1614 warning("%s on %s terminated abnormally, going to single user mode", 1615 _PATH_BSHELL, _PATH_RUNDOWN); 1616 return -2; 1617 } 1618 1619 if ((status = WEXITSTATUS(status)) != 0) 1620 warning("%s returned status %d", _PATH_RUNDOWN, status); 1621 1622 return status; 1623 } 1624 1625 char * 1626 strk (char *p) 1627 { 1628 static char *t; 1629 char *q; 1630 int c; 1631 1632 if (p) 1633 t = p; 1634 if (!t) 1635 return 0; 1636 1637 c = *t; 1638 while (c == ' ' || c == '\t' ) 1639 c = *++t; 1640 if (!c) { 1641 t = 0; 1642 return 0; 1643 } 1644 q = t; 1645 if (c == '\'') { 1646 c = *++t; 1647 q = t; 1648 while (c && c != '\'') 1649 c = *++t; 1650 if (!c) /* unterminated string */ 1651 q = t = 0; 1652 else 1653 *t++ = 0; 1654 } else { 1655 while (c && c != ' ' && c != '\t' ) 1656 c = *++t; 1657 *t++ = 0; 1658 if (!c) 1659 t = 0; 1660 } 1661 return q; 1662 } 1663 1664 #ifdef LOGIN_CAP 1665 void 1666 setprocresources(const char *cname) 1667 { 1668 login_cap_t *lc; 1669 if ((lc = login_getclassbyname(cname, NULL)) != NULL) { 1670 setusercontext(lc, (struct passwd*)NULL, 0, LOGIN_SETPRIORITY|LOGIN_SETRESOURCES); 1671 login_close(lc); 1672 } 1673 } 1674 #endif 1675