Start flushing out the IPI routines and do some clean-up.
[dragonfly/vkernel-mp.git] / sbin / init / init.c
blob782a7c8b0fa8a6eb2bccfa75d46029a8b02a1b05
1 /*-
2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Donn Seeley at Berkeley Software Design, Inc.
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.
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.
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 1.9 2005/11/06 13:23:40 swildner Exp $
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>
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>
65 #ifdef __STDC__
66 #include <stdarg.h>
67 #else
68 #include <varargs.h>
69 #endif
71 #ifdef SECURE
72 #include <pwd.h>
73 #endif
75 #ifdef LOGIN_CAP
76 #include <login_cap.h>
77 #endif
79 #include "pathnames.h"
82 * Sleep times; used to prevent thrashing.
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"
96 * We really need a recursive typedef...
97 * The following at least guarantees that the return type of (*state_t)()
98 * is sufficiently wide to hold a function pointer.
100 typedef long (*state_func_t)(void);
101 typedef state_func_t (*state_t)(void);
103 enum { AUTOBOOT, FASTBOOT } runcom_mode = AUTOBOOT;
104 #define FALSE 0
105 #define TRUE 1
107 static void setctty(const char *);
109 typedef struct init_session {
110 int se_index; /* index of entry in ttys file */
111 pid_t se_process; /* controlling process */
112 time_t se_started; /* used to avoid thrashing */
113 int se_flags; /* status of session */
114 #define SE_SHUTDOWN 0x1 /* session won't be restarted */
115 #define SE_PRESENT 0x2 /* session is in /etc/ttys */
116 int se_nspace; /* spacing count */
117 char *se_device; /* filename of port */
118 char *se_getty; /* what to run on that port */
119 char *se_getty_argv_space; /* pre-parsed argument array space */
120 char **se_getty_argv; /* pre-parsed argument array */
121 char *se_window; /* window system (started only once) */
122 char *se_window_argv_space; /* pre-parsed argument array space */
123 char **se_window_argv; /* pre-parsed argument array */
124 char *se_type; /* default terminal type */
125 struct init_session *se_prev;
126 struct init_session *se_next;
127 } session_t;
129 static void handle(sig_t, ...);
130 static void delset(sigset_t *, ...);
132 static void stall(const char *, ...);
133 static void warning(const char *, ...);
134 static void emergency(const char *, ...);
135 static void disaster(int);
136 static void badsys(int);
137 static int runshutdown(void);
138 static char *strk(char *);
140 static state_func_t single_user(void);
141 static state_func_t runcom(void);
142 static state_func_t read_ttys(void);
143 static state_func_t multi_user(void);
144 static state_func_t clean_ttys(void);
145 static state_func_t catatonia(void);
146 static state_func_t death(void);
148 static void transition(state_t);
150 static void free_session(session_t *);
151 static session_t *new_session(session_t *, int, struct ttyent *);
153 static char **construct_argv(char *);
154 static void start_window_system(session_t *);
155 static void collect_child(pid_t);
156 static pid_t start_getty(session_t *);
157 static void transition_handler(int);
158 static void alrm_handler(int);
159 static void setsecuritylevel(int);
160 static int getsecuritylevel(void);
161 static char *get_chroot(void);
162 static int setupargv(session_t *, struct ttyent *);
163 #ifdef LOGIN_CAP
164 static void setprocresources(const char *);
165 #endif
167 static void clear_session_logs(session_t *);
169 static int start_session_db(void);
170 static void add_session(session_t *);
171 static void del_session(session_t *);
172 static session_t *find_session(pid_t);
174 static int Reboot = FALSE;
175 static int howto = RB_AUTOBOOT;
177 static DB *session_db;
178 static volatile sig_atomic_t clang;
179 static session_t *sessions;
180 state_t requested_transition = runcom;
183 * The mother of all processes.
186 main(int argc, char **argv)
188 char *init_chroot;
189 int c;
190 struct sigaction sa;
191 sigset_t mask;
192 struct stat sts;
195 /* Dispose of random users. */
196 if (getuid() != 0)
197 errx(1, "%s", strerror(EPERM));
199 /* System V users like to reexec init. */
200 if (getpid() != 1) {
201 #ifdef COMPAT_SYSV_INIT
202 /* So give them what they want */
203 if (argc > 1) {
204 if (strlen(argv[1]) == 1) {
205 char runlevel = *argv[1];
206 int sig;
208 switch (runlevel) {
209 case '0': /* halt + poweroff */
210 sig = SIGUSR2;
211 break;
212 case '1': /* single-user */
213 sig = SIGTERM;
214 break;
215 case '6': /* reboot */
216 sig = SIGINT;
217 break;
218 case 'c': /* block further logins */
219 sig = SIGTSTP;
220 break;
221 case 'q': /* rescan /etc/ttys */
222 sig = SIGHUP;
223 break;
224 default:
225 goto invalid;
227 kill(1, sig);
228 _exit(0);
229 } else
230 invalid:
231 errx(1, "invalid run-level ``%s''", argv[1]);
232 } else
233 #endif
234 errx(1, "already running");
237 * Note that this does NOT open a file...
238 * Does 'init' deserve its own facility number?
240 openlog("init", LOG_CONS|LOG_ODELAY, LOG_AUTH);
243 * If chroot has been requested by the boot loader,
244 * do it now. Try to be robust: If the directory
245 * doesn't exist, continue anyway.
247 init_chroot = get_chroot();
248 if (init_chroot != NULL) {
249 if (chdir(init_chroot) == -1 || chroot(".") == -1)
250 warning("can't chroot to %s: %m", init_chroot);
251 free(init_chroot);
255 * Create an initial session.
257 if (setsid() < 0)
258 warning("initial setsid() failed: %m");
261 * Establish an initial user so that programs running
262 * single user do not freak out and die (like passwd).
264 if (setlogin("root") < 0)
265 warning("setlogin() failed: %m");
267 if (stat("/dev/null", &sts) < 0) {
268 warning("/dev MAY BE CORRUPT! /dev/null is missing!\n");
269 sleep(5);
273 * This code assumes that we always get arguments through flags,
274 * never through bits set in some random machine register.
276 while ((c = getopt(argc, argv, "dsf")) != -1)
277 switch (c) {
278 case 'd':
279 /* We don't support DEVFS. */
280 break;
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;
292 if (optind != argc)
293 warning("ignoring excess arguments");
296 * We catch or block signals rather than ignore them,
297 * so that they get reset on exec.
299 handle(badsys, SIGSYS, 0);
300 handle(disaster, SIGABRT, SIGFPE, SIGILL, SIGSEGV,
301 SIGBUS, SIGXCPU, SIGXFSZ, 0);
302 handle(transition_handler, SIGHUP, SIGINT, SIGTERM, SIGTSTP,
303 SIGUSR1, SIGUSR2, 0);
304 handle(alrm_handler, SIGALRM, 0);
305 sigfillset(&mask);
306 delset(&mask, SIGABRT, SIGFPE, SIGILL, SIGSEGV, SIGBUS, SIGSYS,
307 SIGXCPU, SIGXFSZ, SIGHUP, SIGINT, SIGTERM, SIGTSTP, SIGALRM,
308 SIGUSR1, SIGUSR2, 0);
309 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0);
310 sigemptyset(&sa.sa_mask);
311 sa.sa_flags = 0;
312 sa.sa_handler = SIG_IGN;
313 sigaction(SIGTTIN, &sa, (struct sigaction *)0);
314 sigaction(SIGTTOU, &sa, (struct sigaction *)0);
317 * Paranoia.
319 close(0);
320 close(1);
321 close(2);
324 * Start the state machine.
326 transition(requested_transition);
329 * Should never reach here.
331 return 1;
335 * Associate a function with a signal handler.
337 static void
338 handle(sig_t handler, ...)
340 int sig;
341 struct sigaction sa;
342 sigset_t mask_everything;
343 va_list ap;
345 va_start(ap, handler);
347 sa.sa_handler = handler;
348 sigfillset(&mask_everything);
350 while ((sig = va_arg(ap, int)) != NULL) {
351 sa.sa_mask = mask_everything;
352 /* XXX SA_RESTART? */
353 sa.sa_flags = sig == SIGCHLD ? SA_NOCLDSTOP : 0;
354 sigaction(sig, &sa, (struct sigaction *) 0);
356 va_end(ap);
360 * Delete a set of signals from a mask.
362 static void
363 delset(sigset_t *maskp, ...)
365 int sig;
366 va_list ap;
368 va_start(ap, maskp);
370 while ((sig = va_arg(ap, int)) != NULL)
371 sigdelset(maskp, sig);
372 va_end(ap);
376 * Log a message and sleep for a while (to give someone an opportunity
377 * to read it and to save log or hardcopy output if the problem is chronic).
378 * NB: should send a message to the session logger to avoid blocking.
380 static void
381 stall(const char *message, ...)
383 va_list ap;
385 va_start(ap, message);
387 vsyslog(LOG_ALERT, message, ap);
388 va_end(ap);
389 sleep(STALL_TIMEOUT);
393 * Like stall(), but doesn't sleep.
394 * If cpp had variadic macros, the two functions could be #defines for another.
395 * NB: should send a message to the session logger to avoid blocking.
397 static void
398 warning(const char *message, ...)
400 va_list ap;
402 va_start(ap, message);
404 vsyslog(LOG_ALERT, message, ap);
405 va_end(ap);
409 * Log an emergency message.
410 * NB: should send a message to the session logger to avoid blocking.
412 static void
413 emergency(const char *message, ...)
415 va_list ap;
417 va_start(ap, message);
419 vsyslog(LOG_EMERG, message, ap);
420 va_end(ap);
424 * Catch a SIGSYS signal.
426 * These may arise if a system does not support sysctl.
427 * We tolerate up to 25 of these, then throw in the towel.
429 static void
430 badsys(int sig)
432 static int badcount = 0;
434 if (badcount++ < 25)
435 return;
436 disaster(sig);
440 * Catch an unexpected signal.
442 static void
443 disaster(int sig)
445 emergency("fatal signal: %s",
446 (unsigned)sig < NSIG ? sys_siglist[sig] : "unknown signal");
448 sleep(STALL_TIMEOUT);
449 _exit(sig); /* reboot */
453 * Get the security level of the kernel.
455 static int
456 getsecuritylevel(void)
458 #ifdef KERN_SECURELVL
459 int name[2], curlevel;
460 size_t len;
462 name[0] = CTL_KERN;
463 name[1] = KERN_SECURELVL;
464 len = sizeof curlevel;
465 if (sysctl(name, 2, &curlevel, &len, NULL, 0) == -1) {
466 emergency("cannot get kernel security level: %s",
467 strerror(errno));
468 return (-1);
470 return (curlevel);
471 #else
472 return (-1);
473 #endif
477 * Get the value of the "init_chroot" variable from the
478 * kernel environment (or NULL if not set).
481 static char *
482 get_chroot(void)
484 static const char ichname[] = "init_chroot="; /* includes '=' */
485 const int ichlen = strlen(ichname);
486 int real_oid[CTL_MAXNAME];
487 char sbuf[1024];
488 size_t oidlen;
489 char *res;
490 int slen;
491 int i;
493 oidlen = __arysize(real_oid);
494 if (sysctlnametomib("kern.environment", real_oid, &oidlen)) {
495 warning("cannot find kern.environment base sysctl OID");
496 return NULL;
498 if (oidlen + 1 >= __arysize(real_oid)) {
499 warning("kern.environment OID is too large!");
500 return NULL;
502 res = NULL;
503 real_oid[oidlen] = 0;
505 for (i = 0; ; i++) {
506 real_oid[oidlen + 1] = i;
507 slen = sizeof(sbuf);
508 if (sysctl(real_oid, oidlen + 2, sbuf, &slen, NULL, 0) < 0) {
509 if (errno != ENOENT)
510 warning("sysctl kern.environment.%d: %m", i);
511 break;
515 * slen includes the terminating \0, but do a few sanity
516 * checks anyway.
518 if (slen == 0)
519 continue;
520 sbuf[slen - 1] = 0;
521 if (strncmp(sbuf, ichname, ichlen) != 0)
522 continue;
523 if (sbuf[ichlen])
524 res = strdup(sbuf + ichlen);
525 break;
527 return (res);
531 * Set the security level of the kernel.
533 static void
534 setsecuritylevel(int newlevel)
536 #ifdef KERN_SECURELVL
537 int name[2], curlevel;
539 curlevel = getsecuritylevel();
540 if (newlevel == curlevel)
541 return;
542 name[0] = CTL_KERN;
543 name[1] = KERN_SECURELVL;
544 if (sysctl(name, 2, NULL, NULL, &newlevel, sizeof newlevel) == -1) {
545 emergency(
546 "cannot change kernel security level from %d to %d: %s",
547 curlevel, newlevel, strerror(errno));
548 return;
550 #ifdef SECURE
551 warning("kernel security level changed from %d to %d",
552 curlevel, newlevel);
553 #endif
554 #endif
558 * Change states in the finite state machine.
559 * The initial state is passed as an argument.
561 static void
562 transition(state_t s)
564 for (;;)
565 s = (state_t) (*s)();
569 * Close out the accounting files for a login session.
570 * NB: should send a message to the session logger to avoid blocking.
572 static void
573 clear_session_logs(session_t *sp)
575 char *line = sp->se_device + sizeof(_PATH_DEV) - 1;
577 if (logout(line))
578 logwtmp(line, "", "");
582 * Start a session and allocate a controlling terminal.
583 * Only called by children of init after forking.
585 static void
586 setctty(const char *name)
588 int fd;
590 revoke(name);
591 if ((fd = open(name, O_RDWR)) == -1) {
592 stall("can't open %s: %m", name);
593 _exit(1);
595 if (login_tty(fd) == -1) {
596 stall("can't get %s for controlling terminal: %m", name);
597 _exit(1);
602 * Bring the system up single user.
604 static state_func_t
605 single_user(void)
607 pid_t pid, wpid;
608 int status;
609 sigset_t mask;
610 const char *shell = _PATH_BSHELL;
611 const char *argv[2];
612 #ifdef SECURE
613 struct ttyent *typ;
614 struct passwd *pp;
615 static const char banner[] =
616 "Enter root password, or ^D to go multi-user\n";
617 char *clear, *password;
618 #endif
619 #ifdef DEBUGSHELL
620 char altshell[128];
621 #endif
623 if (Reboot) {
624 /* Instead of going single user, let's reboot the machine */
625 sync();
626 alarm(2);
627 pause();
628 reboot(howto);
629 _exit(0);
632 if ((pid = fork()) == 0) {
634 * Start the single user session.
636 setctty(_PATH_CONSOLE);
638 #ifdef SECURE
640 * Check the root password.
641 * We don't care if the console is 'on' by default;
642 * it's the only tty that can be 'off' and 'secure'.
644 typ = getttynam("console");
645 pp = getpwnam("root");
646 if (typ && (typ->ty_status & TTY_SECURE) == 0 &&
647 pp && *pp->pw_passwd) {
648 write(2, banner, sizeof banner - 1);
649 for (;;) {
650 clear = getpass("Password:");
651 if (clear == 0 || *clear == '\0')
652 _exit(0);
653 password = crypt(clear, pp->pw_passwd);
654 bzero(clear, _PASSWORD_LEN);
655 if (strcmp(password, pp->pw_passwd) == 0)
656 break;
657 warning("single-user login failed\n");
660 endttyent();
661 endpwent();
662 #endif /* SECURE */
664 #ifdef DEBUGSHELL
666 char *cp = altshell;
667 int num;
669 #define SHREQUEST \
670 "Enter full pathname of shell or RETURN for " _PATH_BSHELL ": "
671 write(STDERR_FILENO, SHREQUEST, sizeof(SHREQUEST) - 1);
672 while ((num = read(STDIN_FILENO, cp, 1)) != -1 &&
673 num != 0 && *cp != '\n' && cp < &altshell[127])
674 cp++;
675 *cp = '\0';
676 if (altshell[0] != '\0')
677 shell = altshell;
679 #endif /* DEBUGSHELL */
682 * Unblock signals.
683 * We catch all the interesting ones,
684 * and those are reset to SIG_DFL on exec.
686 sigemptyset(&mask);
687 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0);
690 * Fire off a shell.
691 * If the default one doesn't work, try the Bourne shell.
693 argv[0] = "-sh";
694 argv[1] = 0;
695 execv(shell, __DECONST(char **, argv));
696 emergency("can't exec %s for single user: %m", shell);
697 execv(_PATH_BSHELL, __DECONST(char **, argv));
698 emergency("can't exec %s for single user: %m", _PATH_BSHELL);
699 sleep(STALL_TIMEOUT);
700 _exit(1);
703 if (pid == -1) {
705 * We are seriously hosed. Do our best.
707 emergency("can't fork single-user shell, trying again");
708 while (waitpid(-1, (int *) 0, WNOHANG) > 0)
709 continue;
710 return (state_func_t) single_user;
713 requested_transition = 0;
714 do {
715 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1)
716 collect_child(wpid);
717 if (wpid == -1) {
718 if (errno == EINTR)
719 continue;
720 warning("wait for single-user shell failed: %m; restarting");
721 return (state_func_t) single_user;
723 if (wpid == pid && WIFSTOPPED(status)) {
724 warning("init: shell stopped, restarting\n");
725 kill(pid, SIGCONT);
726 wpid = -1;
728 } while (wpid != pid && !requested_transition);
730 if (requested_transition)
731 return (state_func_t) requested_transition;
733 if (!WIFEXITED(status)) {
734 if (WTERMSIG(status) == SIGKILL) {
736 * reboot(8) killed shell?
738 warning("single user shell terminated.");
739 sleep(STALL_TIMEOUT);
740 _exit(0);
741 } else {
742 warning("single user shell terminated, restarting");
743 return (state_func_t) single_user;
747 runcom_mode = FASTBOOT;
748 return (state_func_t) runcom;
752 * Run the system startup script.
754 static state_func_t
755 runcom(void)
757 pid_t pid, wpid;
758 int status;
759 const char *argv[4];
760 struct sigaction sa;
762 if ((pid = fork()) == 0) {
763 sigemptyset(&sa.sa_mask);
764 sa.sa_flags = 0;
765 sa.sa_handler = SIG_IGN;
766 sigaction(SIGTSTP, &sa, (struct sigaction *)0);
767 sigaction(SIGHUP, &sa, (struct sigaction *)0);
769 setctty(_PATH_CONSOLE);
771 argv[0] = "sh";
772 argv[1] = _PATH_RUNCOM;
773 argv[2] = runcom_mode == AUTOBOOT ? "autoboot" : 0;
774 argv[3] = 0;
776 sigprocmask(SIG_SETMASK, &sa.sa_mask, (sigset_t *) 0);
778 #ifdef LOGIN_CAP
779 setprocresources(RESOURCE_RC);
780 #endif
781 execv(_PATH_BSHELL, __DECONST(char **, argv));
782 stall("can't exec %s for %s: %m", _PATH_BSHELL, _PATH_RUNCOM);
783 _exit(1); /* force single user mode */
786 if (pid == -1) {
787 emergency("can't fork for %s on %s: %m",
788 _PATH_BSHELL, _PATH_RUNCOM);
789 while (waitpid(-1, (int *) 0, WNOHANG) > 0)
790 continue;
791 sleep(STALL_TIMEOUT);
792 return (state_func_t) single_user;
796 * Copied from single_user(). This is a bit paranoid.
798 requested_transition = 0;
799 do {
800 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1)
801 collect_child(wpid);
802 if (wpid == -1) {
803 if (requested_transition == death)
804 return (state_func_t) death;
805 if (errno == EINTR)
806 continue;
807 warning("wait for %s on %s failed: %m; going to single user mode",
808 _PATH_BSHELL, _PATH_RUNCOM);
809 return (state_func_t) single_user;
811 if (wpid == pid && WIFSTOPPED(status)) {
812 warning("init: %s on %s stopped, restarting\n",
813 _PATH_BSHELL, _PATH_RUNCOM);
814 kill(pid, SIGCONT);
815 wpid = -1;
817 } while (wpid != pid);
819 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGTERM &&
820 requested_transition == catatonia) {
821 /* /etc/rc executed /sbin/reboot; wait for the end quietly */
822 sigset_t s;
824 sigfillset(&s);
825 for (;;)
826 sigsuspend(&s);
829 if (!WIFEXITED(status)) {
830 warning("%s on %s terminated abnormally, going to single user mode",
831 _PATH_BSHELL, _PATH_RUNCOM);
832 return (state_func_t) single_user;
835 if (WEXITSTATUS(status))
836 return (state_func_t) single_user;
838 runcom_mode = AUTOBOOT; /* the default */
839 /* NB: should send a message to the session logger to avoid blocking. */
840 logwtmp("~", "reboot", "");
841 return (state_func_t) read_ttys;
845 * Open the session database.
847 * NB: We could pass in the size here; is it necessary?
849 static int
850 start_session_db(void)
852 if (session_db && (*session_db->close)(session_db))
853 emergency("session database close: %s", strerror(errno));
854 if ((session_db = dbopen(NULL, O_RDWR, 0, DB_HASH, NULL)) == 0) {
855 emergency("session database open: %s", strerror(errno));
856 return (1);
858 return (0);
863 * Add a new login session.
865 static void
866 add_session(session_t *sp)
868 DBT key;
869 DBT data;
871 key.data = &sp->se_process;
872 key.size = sizeof sp->se_process;
873 data.data = &sp;
874 data.size = sizeof sp;
876 if ((*session_db->put)(session_db, &key, &data, 0))
877 emergency("insert %d: %s", sp->se_process, strerror(errno));
881 * Delete an old login session.
883 static void
884 del_session(session_t *sp)
886 DBT key;
888 key.data = &sp->se_process;
889 key.size = sizeof sp->se_process;
891 if ((*session_db->del)(session_db, &key, 0))
892 emergency("delete %d: %s", sp->se_process, strerror(errno));
896 * Look up a login session by pid.
898 static session_t *
899 find_session(pid_t pid)
901 DBT key;
902 DBT data;
903 session_t *ret;
905 key.data = &pid;
906 key.size = sizeof pid;
907 if ((*session_db->get)(session_db, &key, &data, 0) != 0)
908 return 0;
909 bcopy(data.data, (char *)&ret, sizeof(ret));
910 return ret;
914 * Construct an argument vector from a command line.
916 static char **
917 construct_argv(char *command)
919 int argc = 0;
920 char **argv = malloc(((strlen(command) + 1) / 2 + 1)
921 * sizeof (char *));
923 if ((argv[argc++] = strk(command)) == 0) {
924 free(argv);
925 return (NULL);
927 while ((argv[argc++] = strk((char *) 0)) != NULL)
928 continue;
929 return argv;
933 * Deallocate a session descriptor.
935 static void
936 free_session(session_t *sp)
938 free(sp->se_device);
939 if (sp->se_getty) {
940 free(sp->se_getty);
941 free(sp->se_getty_argv_space);
942 free(sp->se_getty_argv);
944 if (sp->se_window) {
945 free(sp->se_window);
946 free(sp->se_window_argv_space);
947 free(sp->se_window_argv);
949 if (sp->se_type)
950 free(sp->se_type);
951 free(sp);
955 * Allocate a new session descriptor.
956 * Mark it SE_PRESENT.
958 static session_t *
959 new_session(session_t *sprev, int session_index, struct ttyent *typ)
961 session_t *sp;
962 int fd;
964 if ((typ->ty_status & TTY_ON) == 0 ||
965 typ->ty_name == 0 ||
966 typ->ty_getty == 0)
967 return 0;
969 sp = (session_t *) calloc(1, sizeof (session_t));
971 sp->se_index = session_index;
972 sp->se_flags |= SE_PRESENT;
974 sp->se_device = malloc(sizeof(_PATH_DEV) + strlen(typ->ty_name));
975 sprintf(sp->se_device, "%s%s", _PATH_DEV, typ->ty_name);
978 * Attempt to open the device, if we get "device not configured"
979 * then don't add the device to the session list.
981 if ((fd = open(sp->se_device, O_RDONLY | O_NONBLOCK, 0)) < 0) {
982 if (errno == ENXIO) {
983 free_session(sp);
984 return (0);
986 } else
987 close(fd);
989 if (setupargv(sp, typ) == 0) {
990 free_session(sp);
991 return (0);
994 sp->se_next = 0;
995 if (sprev == 0) {
996 sessions = sp;
997 sp->se_prev = 0;
998 } else {
999 sprev->se_next = sp;
1000 sp->se_prev = sprev;
1003 return sp;
1007 * Calculate getty and if useful window argv vectors.
1009 static int
1010 setupargv(session_t *sp, struct ttyent *typ)
1013 if (sp->se_getty) {
1014 free(sp->se_getty);
1015 free(sp->se_getty_argv_space);
1016 free(sp->se_getty_argv);
1018 sp->se_getty = malloc(strlen(typ->ty_getty) + strlen(typ->ty_name) + 2);
1019 sprintf(sp->se_getty, "%s %s", typ->ty_getty, typ->ty_name);
1020 sp->se_getty_argv_space = strdup(sp->se_getty);
1021 sp->se_getty_argv = construct_argv(sp->se_getty_argv_space);
1022 if (sp->se_getty_argv == 0) {
1023 warning("can't parse getty for port %s", sp->se_device);
1024 free(sp->se_getty);
1025 free(sp->se_getty_argv_space);
1026 sp->se_getty = sp->se_getty_argv_space = 0;
1027 return (0);
1029 if (sp->se_window) {
1030 free(sp->se_window);
1031 free(sp->se_window_argv_space);
1032 free(sp->se_window_argv);
1034 sp->se_window = sp->se_window_argv_space = 0;
1035 sp->se_window_argv = 0;
1036 if (typ->ty_window) {
1037 sp->se_window = strdup(typ->ty_window);
1038 sp->se_window_argv_space = strdup(sp->se_window);
1039 sp->se_window_argv = construct_argv(sp->se_window_argv_space);
1040 if (sp->se_window_argv == 0) {
1041 warning("can't parse window for port %s",
1042 sp->se_device);
1043 free(sp->se_window_argv_space);
1044 free(sp->se_window);
1045 sp->se_window = sp->se_window_argv_space = 0;
1046 return (0);
1049 if (sp->se_type)
1050 free(sp->se_type);
1051 sp->se_type = typ->ty_type ? strdup(typ->ty_type) : 0;
1052 return (1);
1056 * Walk the list of ttys and create sessions for each active line.
1058 static state_func_t
1059 read_ttys(void)
1061 int session_index = 0;
1062 session_t *sp, *snext;
1063 struct ttyent *typ;
1066 * Destroy any previous session state.
1067 * There shouldn't be any, but just in case...
1069 for (sp = sessions; sp; sp = snext) {
1070 if (sp->se_process)
1071 clear_session_logs(sp);
1072 snext = sp->se_next;
1073 free_session(sp);
1075 sessions = 0;
1076 if (start_session_db())
1077 return (state_func_t) single_user;
1080 * Allocate a session entry for each active port.
1081 * Note that sp starts at 0.
1083 while ((typ = getttyent()) != NULL)
1084 if ((snext = new_session(sp, ++session_index, typ)) != NULL)
1085 sp = snext;
1087 endttyent();
1089 return (state_func_t) multi_user;
1093 * Start a window system running.
1095 static void
1096 start_window_system(session_t *sp)
1098 pid_t pid;
1099 sigset_t mask;
1100 char term[64], *env[2];
1102 if ((pid = fork()) == -1) {
1103 emergency("can't fork for window system on port %s: %m",
1104 sp->se_device);
1105 /* hope that getty fails and we can try again */
1106 return;
1109 if (pid)
1110 return;
1112 sigemptyset(&mask);
1113 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0);
1115 if (setsid() < 0)
1116 emergency("setsid failed (window) %m");
1118 #ifdef LOGIN_CAP
1119 setprocresources(RESOURCE_WINDOW);
1120 #endif
1121 if (sp->se_type) {
1122 /* Don't use malloc after fork */
1123 strcpy(term, "TERM=");
1124 strncat(term, sp->se_type, sizeof(term) - 6);
1125 env[0] = term;
1126 env[1] = 0;
1128 else
1129 env[0] = 0;
1130 execve(sp->se_window_argv[0], sp->se_window_argv, env);
1131 stall("can't exec window system '%s' for port %s: %m",
1132 sp->se_window_argv[0], sp->se_device);
1133 _exit(1);
1137 * Start a login session running.
1139 static pid_t
1140 start_getty(session_t *sp)
1142 pid_t pid;
1143 sigset_t mask;
1144 time_t current_time = time((time_t *) 0);
1145 int too_quick = 0;
1146 char term[64], *env[2];
1148 if (current_time >= sp->se_started &&
1149 current_time - sp->se_started < GETTY_SPACING) {
1150 if (++sp->se_nspace > GETTY_NSPACE) {
1151 sp->se_nspace = 0;
1152 too_quick = 1;
1154 } else
1155 sp->se_nspace = 0;
1158 * fork(), not vfork() -- we can't afford to block.
1160 if ((pid = fork()) == -1) {
1161 emergency("can't fork for getty on port %s: %m", sp->se_device);
1162 return -1;
1165 if (pid)
1166 return pid;
1168 if (too_quick) {
1169 warning("getty repeating too quickly on port %s, sleeping %d secs",
1170 sp->se_device, GETTY_SLEEP);
1171 sleep((unsigned) GETTY_SLEEP);
1174 if (sp->se_window) {
1175 start_window_system(sp);
1176 sleep(WINDOW_WAIT);
1179 sigemptyset(&mask);
1180 sigprocmask(SIG_SETMASK, &mask, (sigset_t *) 0);
1182 #ifdef LOGIN_CAP
1183 setprocresources(RESOURCE_GETTY);
1184 #endif
1185 if (sp->se_type) {
1186 /* Don't use malloc after fork */
1187 strcpy(term, "TERM=");
1188 strncat(term, sp->se_type, sizeof(term) - 6);
1189 env[0] = term;
1190 env[1] = 0;
1192 else
1193 env[0] = 0;
1194 execve(sp->se_getty_argv[0], sp->se_getty_argv, env);
1195 stall("can't exec getty '%s' for port %s: %m",
1196 sp->se_getty_argv[0], sp->se_device);
1197 _exit(1);
1201 * Collect exit status for a child.
1202 * If an exiting login, start a new login running.
1204 static void
1205 collect_child(pid_t pid)
1207 session_t *sp, *sprev, *snext;
1209 if (! sessions)
1210 return;
1212 if (! (sp = find_session(pid)))
1213 return;
1215 clear_session_logs(sp);
1216 del_session(sp);
1217 sp->se_process = 0;
1219 if (sp->se_flags & SE_SHUTDOWN) {
1220 if ((sprev = sp->se_prev) != NULL)
1221 sprev->se_next = sp->se_next;
1222 else
1223 sessions = sp->se_next;
1224 if ((snext = sp->se_next) != NULL)
1225 snext->se_prev = sp->se_prev;
1226 free_session(sp);
1227 return;
1230 if ((pid = start_getty(sp)) == -1) {
1231 /* serious trouble */
1232 requested_transition = clean_ttys;
1233 return;
1236 sp->se_process = pid;
1237 sp->se_started = time((time_t *) 0);
1238 add_session(sp);
1242 * Catch a signal and request a state transition.
1244 static void
1245 transition_handler(int sig)
1248 switch (sig) {
1249 case SIGHUP:
1250 requested_transition = clean_ttys;
1251 break;
1252 case SIGUSR2:
1253 howto = RB_POWEROFF;
1254 case SIGUSR1:
1255 howto |= RB_HALT;
1256 case SIGINT:
1257 Reboot = TRUE;
1258 case SIGTERM:
1259 requested_transition = death;
1260 break;
1261 case SIGTSTP:
1262 requested_transition = catatonia;
1263 break;
1264 default:
1265 requested_transition = 0;
1266 break;
1271 * Take the system multiuser.
1273 static state_func_t
1274 multi_user(void)
1276 pid_t pid;
1277 session_t *sp;
1279 requested_transition = 0;
1282 * If the administrator has not set the security level to -1
1283 * to indicate that the kernel should not run multiuser in secure
1284 * mode, and the run script has not set a higher level of security
1285 * than level 1, then put the kernel into secure mode.
1287 if (getsecuritylevel() == 0)
1288 setsecuritylevel(1);
1290 for (sp = sessions; sp; sp = sp->se_next) {
1291 if (sp->se_process)
1292 continue;
1293 if ((pid = start_getty(sp)) == -1) {
1294 /* serious trouble */
1295 requested_transition = clean_ttys;
1296 break;
1298 sp->se_process = pid;
1299 sp->se_started = time((time_t *) 0);
1300 add_session(sp);
1303 while (!requested_transition)
1304 if ((pid = waitpid(-1, (int *) 0, 0)) != -1)
1305 collect_child(pid);
1307 return (state_func_t) requested_transition;
1311 * This is an (n*2)+(n^2) algorithm. We hope it isn't run often...
1313 static state_func_t
1314 clean_ttys(void)
1316 session_t *sp, *sprev;
1317 struct ttyent *typ;
1318 int session_index = 0;
1319 int devlen;
1320 char *old_getty, *old_window, *old_type;
1322 if (! sessions)
1323 return (state_func_t) multi_user;
1326 * mark all sessions for death, (!SE_PRESENT)
1327 * as we find or create new ones they'll be marked as keepers,
1328 * we'll later nuke all the ones not found in /etc/ttys
1330 for (sp = sessions; sp != NULL; sp = sp->se_next)
1331 sp->se_flags &= ~SE_PRESENT;
1333 devlen = sizeof(_PATH_DEV) - 1;
1334 while ((typ = getttyent()) != NULL) {
1335 ++session_index;
1337 for (sprev = 0, sp = sessions; sp; sprev = sp, sp = sp->se_next)
1338 if (strcmp(typ->ty_name, sp->se_device + devlen) == 0)
1339 break;
1341 if (sp) {
1342 /* we want this one to live */
1343 sp->se_flags |= SE_PRESENT;
1344 if (sp->se_index != session_index) {
1345 warning("port %s changed utmp index from %d to %d",
1346 sp->se_device, sp->se_index,
1347 session_index);
1348 sp->se_index = session_index;
1350 if ((typ->ty_status & TTY_ON) == 0 ||
1351 typ->ty_getty == 0) {
1352 sp->se_flags |= SE_SHUTDOWN;
1353 kill(sp->se_process, SIGHUP);
1354 continue;
1356 sp->se_flags &= ~SE_SHUTDOWN;
1357 old_getty = sp->se_getty ? strdup(sp->se_getty) : 0;
1358 old_window = sp->se_window ? strdup(sp->se_window) : 0;
1359 old_type = sp->se_type ? strdup(sp->se_type) : 0;
1360 if (setupargv(sp, typ) == 0) {
1361 warning("can't parse getty for port %s",
1362 sp->se_device);
1363 sp->se_flags |= SE_SHUTDOWN;
1364 kill(sp->se_process, SIGHUP);
1366 else if ( !old_getty
1367 || (!old_type && sp->se_type)
1368 || (old_type && !sp->se_type)
1369 || (!old_window && sp->se_window)
1370 || (old_window && !sp->se_window)
1371 || (strcmp(old_getty, sp->se_getty) != 0)
1372 || (old_window && strcmp(old_window, sp->se_window) != 0)
1373 || (old_type && strcmp(old_type, sp->se_type) != 0)
1375 /* Don't set SE_SHUTDOWN here */
1376 sp->se_nspace = 0;
1377 sp->se_started = 0;
1378 kill(sp->se_process, SIGHUP);
1380 if (old_getty)
1381 free(old_getty);
1382 if (old_window)
1383 free(old_window);
1384 if (old_type)
1385 free(old_type);
1386 continue;
1389 new_session(sprev, session_index, typ);
1392 endttyent();
1395 * sweep through and kill all deleted sessions
1396 * ones who's /etc/ttys line was deleted (SE_PRESENT unset)
1398 for (sp = sessions; sp != NULL; sp = sp->se_next) {
1399 if ((sp->se_flags & SE_PRESENT) == 0) {
1400 sp->se_flags |= SE_SHUTDOWN;
1401 kill(sp->se_process, SIGHUP);
1405 return (state_func_t) multi_user;
1409 * Block further logins.
1411 static state_func_t
1412 catatonia(void)
1414 session_t *sp;
1416 for (sp = sessions; sp; sp = sp->se_next)
1417 sp->se_flags |= SE_SHUTDOWN;
1419 return (state_func_t) multi_user;
1423 * Note SIGALRM.
1425 static void
1426 alrm_handler(int sig __unused)
1428 clang = 1;
1432 * Bring the system down to single user.
1434 static state_func_t
1435 death(void)
1437 session_t *sp;
1438 int i;
1439 pid_t pid;
1440 static const int death_sigs[2] = { SIGTERM, SIGKILL };
1442 /* NB: should send a message to the session logger to avoid blocking. */
1443 logwtmp("~", "shutdown", "");
1445 for (sp = sessions; sp; sp = sp->se_next) {
1446 sp->se_flags |= SE_SHUTDOWN;
1447 kill(sp->se_process, SIGHUP);
1450 /* Try to run the rc.shutdown script within a period of time */
1451 runshutdown();
1453 for (i = 0; i < 2; ++i) {
1454 if (kill(-1, death_sigs[i]) == -1 && errno == ESRCH)
1455 return (state_func_t) single_user;
1457 clang = 0;
1458 alarm(DEATH_WATCH);
1460 if ((pid = waitpid(-1, (int *)0, 0)) != -1)
1461 collect_child(pid);
1462 while (clang == 0 && errno != ECHILD);
1464 if (errno == ECHILD)
1465 return (state_func_t) single_user;
1468 warning("some processes would not die; ps axl advised");
1470 return (state_func_t) single_user;
1474 * Run the system shutdown script.
1476 * Exit codes: XXX I should document more
1477 * -2 shutdown script terminated abnormally
1478 * -1 fatal error - can't run script
1479 * 0 good.
1480 * >0 some error (exit code)
1482 static int
1483 runshutdown(void)
1485 pid_t pid, wpid;
1486 int status;
1487 int shutdowntimeout;
1488 size_t len;
1489 const char *argv[4];
1490 struct sigaction sa;
1491 struct stat sb;
1494 * rc.shutdown is optional, so to prevent any unnecessary
1495 * complaints from the shell we simply don't run it if the
1496 * file does not exist. If the stat() here fails for other
1497 * reasons, we'll let the shell complain.
1499 if (stat(_PATH_RUNDOWN, &sb) == -1 && errno == ENOENT)
1500 return 0;
1502 if ((pid = fork()) == 0) {
1503 int fd;
1505 /* Assume that init already grab console as ctty before */
1507 sigemptyset(&sa.sa_mask);
1508 sa.sa_flags = 0;
1509 sa.sa_handler = SIG_IGN;
1510 sigaction(SIGTSTP, &sa, (struct sigaction *)0);
1511 sigaction(SIGHUP, &sa, (struct sigaction *)0);
1513 if ((fd = open(_PATH_CONSOLE, O_RDWR)) == -1)
1514 warning("can't open %s: %m", _PATH_CONSOLE);
1515 else {
1516 dup2(fd, 0);
1517 dup2(fd, 1);
1518 dup2(fd, 2);
1519 if (fd > 2)
1520 close(fd);
1524 * Run the shutdown script.
1526 argv[0] = "sh";
1527 argv[1] = _PATH_RUNDOWN;
1528 if (Reboot)
1529 argv[2] = "reboot";
1530 else
1531 argv[2] = "single";
1532 argv[3] = 0;
1534 sigprocmask(SIG_SETMASK, &sa.sa_mask, (sigset_t *) 0);
1536 #ifdef LOGIN_CAP
1537 setprocresources(RESOURCE_RC);
1538 #endif
1539 execv(_PATH_BSHELL, __DECONST(char **, argv));
1540 warning("can't exec %s for %s: %m", _PATH_BSHELL, _PATH_RUNDOWN);
1541 _exit(1); /* force single user mode */
1544 if (pid == -1) {
1545 emergency("can't fork for %s on %s: %m",
1546 _PATH_BSHELL, _PATH_RUNDOWN);
1547 while (waitpid(-1, (int *) 0, WNOHANG) > 0)
1548 continue;
1549 sleep(STALL_TIMEOUT);
1550 return -1;
1553 len = sizeof(shutdowntimeout);
1554 if (sysctlbyname("kern.shutdown_timeout",
1555 &shutdowntimeout,
1556 &len, NULL, 0) == -1 || shutdowntimeout < 2)
1557 shutdowntimeout = DEATH_SCRIPT;
1558 alarm(shutdowntimeout);
1559 clang = 0;
1561 * Copied from single_user(). This is a bit paranoid.
1562 * Use the same ALRM handler.
1564 do {
1565 if ((wpid = waitpid(-1, &status, WUNTRACED)) != -1)
1566 collect_child(wpid);
1567 if (clang == 1) {
1568 /* we were waiting for the sub-shell */
1569 kill(wpid, SIGTERM);
1570 warning("timeout expired for %s on %s: %m; going to single user mode",
1571 _PATH_BSHELL, _PATH_RUNDOWN);
1572 return -1;
1574 if (wpid == -1) {
1575 if (errno == EINTR)
1576 continue;
1577 warning("wait for %s on %s failed: %m; going to single user mode",
1578 _PATH_BSHELL, _PATH_RUNDOWN);
1579 return -1;
1581 if (wpid == pid && WIFSTOPPED(status)) {
1582 warning("init: %s on %s stopped, restarting\n",
1583 _PATH_BSHELL, _PATH_RUNDOWN);
1584 kill(pid, SIGCONT);
1585 wpid = -1;
1587 } while (wpid != pid && !clang);
1589 /* Turn off the alarm */
1590 alarm(0);
1592 if (WIFSIGNALED(status) && WTERMSIG(status) == SIGTERM &&
1593 requested_transition == catatonia) {
1595 * /etc/rc.shutdown executed /sbin/reboot;
1596 * wait for the end quietly
1598 sigset_t s;
1600 sigfillset(&s);
1601 for (;;)
1602 sigsuspend(&s);
1605 if (!WIFEXITED(status)) {
1606 warning("%s on %s terminated abnormally, going to single user mode",
1607 _PATH_BSHELL, _PATH_RUNDOWN);
1608 return -2;
1611 if ((status = WEXITSTATUS(status)) != 0)
1612 warning("%s returned status %d", _PATH_RUNDOWN, status);
1614 return status;
1617 static char *
1618 strk(char *p)
1620 static char *t;
1621 char *q;
1622 int c;
1624 if (p)
1625 t = p;
1626 if (!t)
1627 return 0;
1629 c = *t;
1630 while (c == ' ' || c == '\t' )
1631 c = *++t;
1632 if (!c) {
1633 t = 0;
1634 return 0;
1636 q = t;
1637 if (c == '\'') {
1638 c = *++t;
1639 q = t;
1640 while (c && c != '\'')
1641 c = *++t;
1642 if (!c) /* unterminated string */
1643 q = t = 0;
1644 else
1645 *t++ = 0;
1646 } else {
1647 while (c && c != ' ' && c != '\t' )
1648 c = *++t;
1649 *t++ = 0;
1650 if (!c)
1651 t = 0;
1653 return q;
1656 #ifdef LOGIN_CAP
1657 static void
1658 setprocresources(const char *cname)
1660 login_cap_t *lc;
1661 if ((lc = login_getclassbyname(cname, NULL)) != NULL) {
1662 setusercontext(lc, (struct passwd*)NULL, 0, LOGIN_SETPRIORITY|LOGIN_SETRESOURCES);
1663 login_close(lc);
1666 #endif