GC !__DragonFly__ section.
[dragonfly.git] / sbin / init / init.c
CommitLineData
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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.
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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 $
7cee7052 39 * $DragonFly: src/sbin/init/init.c,v 1.7 2004/12/18 21:43:38 swildner Exp $
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40 */
41
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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
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95void handle(sig_t, ...);
96void delset(sigset_t *, ...);
984263bc 97
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98void stall(char *, ...);
99void warning(char *, ...);
100void emergency(char *, ...);
101void disaster(int);
102void badsys(int);
103int runshutdown(void);
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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 */
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110typedef long (*state_func_t)(void);
111typedef state_func_t (*state_t)(void);
984263bc 112
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113state_func_t single_user(void);
114state_func_t runcom(void);
115state_func_t read_ttys(void);
116state_func_t multi_user(void);
117state_func_t clean_ttys(void);
118state_func_t catatonia(void);
119state_func_t death(void);
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120
121enum { AUTOBOOT, FASTBOOT } runcom_mode = AUTOBOOT;
122#define FALSE 0
123#define TRUE 1
124
125int Reboot = FALSE;
126int howto = RB_AUTOBOOT;
127
9a76cd75 128void transition(state_t);
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129state_t requested_transition = runcom;
130
9a76cd75 131void setctty(char *);
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132
133typedef 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
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153void free_session(session_t *);
154session_t *new_session(session_t *, int, struct ttyent *);
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155session_t *sessions;
156
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157char **construct_argv(char *);
158void start_window_system(session_t *);
159void collect_child(pid_t);
160pid_t start_getty(session_t *);
161void transition_handler(int);
162void alrm_handler(int);
163void setsecuritylevel(int);
164int getsecuritylevel(void);
0aeef1e8 165char *get_chroot(void);
9a76cd75 166int setupargv(session_t *, struct ttyent *);
984263bc 167#ifdef LOGIN_CAP
9a76cd75 168void setprocresources(const char *);
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169#endif
170int clang;
171
9a76cd75 172void clear_session_logs(session_t *);
984263bc 173
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174int start_session_db(void);
175void add_session(session_t *);
176void del_session(session_t *);
177session_t *find_session(pid_t);
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178DB *session_db;
179
180/*
181 * The mother of all processes.
182 */
183int
b5744197 184main(int argc, char **argv)
984263bc 185{
0aeef1e8 186 char *init_chroot;
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187 int c;
188 struct sigaction sa;
189 sigset_t mask;
75e1b5ea 190 struct stat sts;
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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
228invalid:
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
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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
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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
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265 if (stat("/dev/null", &sts) < 0) {
266 warning("/dev MAY BE CORRUPT! /dev/null is missing!\n");
267 sleep(5);
268 }
269
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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;
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311 sigaction(SIGTTIN, &sa, (struct sigaction *)0);
312 sigaction(SIGTTOU, &sa, (struct sigaction *)0);
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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 */
335void
984263bc 336handle(sig_t handler, ...)
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337{
338 int sig;
339 struct sigaction sa;
340 sigset_t mask_everything;
341 va_list ap;
984263bc 342
984263bc 343 va_start(ap, handler);
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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 */
360void
984263bc 361delset(sigset_t *maskp, ...)
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362{
363 int sig;
364 va_list ap;
984263bc 365
984263bc 366 va_start(ap, maskp);
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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 */
378void
984263bc 379stall(char *message, ...)
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380{
381 va_list ap;
984263bc 382
984263bc 383 va_start(ap, message);
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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 */
395void
984263bc 396warning(char *message, ...)
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397{
398 va_list ap;
984263bc 399
984263bc 400 va_start(ap, message);
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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 */
410void
984263bc 411emergency(char *message, ...)
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412{
413 va_list ap;
984263bc 414
984263bc 415 va_start(ap, message);
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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 */
427void
b5744197 428badsys(int sig)
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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 */
440void
b5744197 441disaster(int sig)
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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 */
453int
b5744197 454getsecuritylevel(void)
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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
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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 */
479char *
480get_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
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535/*
536 * Set the security level of the kernel.
537 */
538void
b5744197 539setsecuritylevel(int newlevel)
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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 */
566void
b5744197 567transition(state_t s)
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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 */
577void
b5744197 578clear_session_logs(session_t *sp)
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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 */
590void
b5744197 591setctty(char *name)
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592{
593 int fd;
594
7cee7052 595 revoke(name);
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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 */
609state_func_t
b5744197 610single_user(void)
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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 ": "
7cee7052 676 write(STDERR_FILENO, SHREQUEST, sizeof(SHREQUEST) - 1);
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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 */
759state_func_t
b5744197 760runcom(void)
984263bc
MD
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;
7cee7052
SW
771 sigaction(SIGTSTP, &sa, (struct sigaction *)0);
772 sigaction(SIGHUP, &sa, (struct sigaction *)0);
984263bc
MD
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 */
854int
b5744197 855start_session_db(void)
984263bc
MD
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 */
870void
b5744197 871add_session(session_t *sp)
984263bc
MD
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 */
888void
b5744197 889del_session(session_t *sp)
984263bc
MD
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 */
903session_t *
984263bc 904find_session(pid_t pid)
984263bc
MD
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 */
921char **
b5744197 922construct_argv(char *command)
984263bc
MD
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 */
941void
b5744197 942free_session(register session_t *sp)
984263bc
MD
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 */
964session_t *
b5744197 965new_session(session_t *sprev, int session_index, register struct ttyent *typ)
984263bc
MD
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));
7cee7052 981 sprintf(sp->se_device, "%s%s", _PATH_DEV, typ->ty_name);
984263bc
MD
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 */
1015int
b5744197 1016setupargv(session_t *sp, struct ttyent *typ)
984263bc
MD
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);
7cee7052 1025 sprintf(sp->se_getty, "%s %s", typ->ty_getty, typ->ty_name);
984263bc
MD
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 */
1064state_func_t
b5744197 1065read_ttys(void)
984263bc
MD
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 */
1101void
b5744197 1102start_window_system(session_t *sp)
984263bc
MD
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 */
1145pid_t
b5744197 1146start_getty(session_t *sp)
984263bc
MD
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 */
1210void
984263bc 1211collect_child(pid_t pid)
984263bc
MD
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 */
1250void
b5744197 1251transition_handler(int sig)
984263bc
MD
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 */
1279state_func_t
b5744197 1280multi_user(void)
984263bc
MD
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 */
1319state_func_t
b5744197 1320clean_ttys(void)
984263bc
MD
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 */
1417state_func_t
b5744197 1418catatonia(void)
984263bc
MD
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 */
1431void
b5744197 1432alrm_handler(int sig)
984263bc 1433{
7cee7052 1434 sig;
984263bc
MD
1435 clang = 1;
1436}
1437
1438/*
1439 * Bring the system down to single user.
1440 */
1441state_func_t
b5744197 1442death(void)
984263bc
MD
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 */
7cee7052 1458 runshutdown();
984263bc
MD
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 */
1489int
b5744197 1490runshutdown(void)
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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;
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1517 sigaction(SIGTSTP, &sa, (struct sigaction *)0);
1518 sigaction(SIGHUP, &sa, (struct sigaction *)0);
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1519
1520 if ((fd = open(_PATH_CONSOLE, O_RDWR)) == -1)
1521 warning("can't open %s: %m", _PATH_CONSOLE);
1522 else {
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1523 dup2(fd, 0);
1524 dup2(fd, 1);
1525 dup2(fd, 2);
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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
1624char *
1625strk (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
1664void
b5744197 1665setprocresources(const char *cname)
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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