]>
Commit | Line | Data |
---|---|---|
1 | /* | |
2 | * Init A System-V Init Clone. | |
3 | * | |
4 | * Usage: /sbin/init | |
5 | * init [0123456SsQqAaBbCc] | |
6 | * telinit [0123456SsQqAaBbCc] | |
7 | * | |
8 | * Version: @(#)init.c 2.86 30-Jul-2004 miquels@cistron.nl | |
9 | */ | |
10 | #define VERSION "2.88" | |
11 | #define DATE "31-Jul-2004" | |
12 | /* | |
13 | * This file is part of the sysvinit suite, | |
14 | * Copyright (C) 1991-2004 Miquel van Smoorenburg. | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or modify | |
17 | * it under the terms of the GNU General Public License as published by | |
18 | * the Free Software Foundation; either version 2 of the License, or | |
19 | * (at your option) any later version. | |
20 | * | |
21 | * This program is distributed in the hope that it will be useful, | |
22 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
23 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24 | * GNU General Public License for more details. | |
25 | * | |
26 | * You should have received a copy of the GNU General Public License | |
27 | * along with this program; if not, write to the Free Software | |
28 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
29 | * | |
30 | */ | |
31 | ||
32 | #include <sys/types.h> | |
33 | #include <sys/stat.h> | |
34 | #include <sys/ioctl.h> | |
35 | #include <sys/wait.h> | |
36 | #ifdef __linux__ | |
37 | #include <sys/kd.h> | |
38 | #endif | |
39 | #include <sys/resource.h> | |
40 | #include <stdlib.h> | |
41 | #include <unistd.h> | |
42 | #include <errno.h> | |
43 | #include <stdio.h> | |
44 | #include <time.h> | |
45 | #include <fcntl.h> | |
46 | #include <string.h> | |
47 | #include <signal.h> | |
48 | #include <termios.h> | |
49 | #include <utmp.h> | |
50 | #include <ctype.h> | |
51 | #include <stdarg.h> | |
52 | #include <sys/syslog.h> | |
53 | #include <sys/time.h> | |
54 | ||
55 | #ifdef WITH_SELINUX | |
56 | #include <selinux/selinux.h> | |
57 | #endif | |
58 | ||
59 | ||
60 | #ifdef __i386__ | |
61 | # if (__GLIBC__ >= 2) | |
62 | /* GNU libc 2.x */ | |
63 | # define STACK_DEBUG 1 | |
64 | # if (__GLIBC__ == 2 && __GLIBC_MINOR__ == 0) | |
65 | /* Only glibc 2.0 needs this */ | |
66 | # include <sigcontext.h> | |
67 | # endif | |
68 | # endif | |
69 | #endif | |
70 | ||
71 | #include "init.h" | |
72 | #include "initreq.h" | |
73 | #include "paths.h" | |
74 | #include "reboot.h" | |
75 | #include "set.h" | |
76 | ||
77 | #ifndef SIGPWR | |
78 | # define SIGPWR SIGUSR2 | |
79 | #endif | |
80 | ||
81 | #ifndef CBAUD | |
82 | # define CBAUD 0 | |
83 | #endif | |
84 | #ifndef CBAUDEX | |
85 | # define CBAUDEX 0 | |
86 | #endif | |
87 | ||
88 | /* Set a signal handler. */ | |
89 | #define SETSIG(sa, sig, fun, flags) \ | |
90 | do { \ | |
91 | sa.sa_handler = fun; \ | |
92 | sa.sa_flags = flags; \ | |
93 | sigemptyset(&sa.sa_mask); \ | |
94 | sigaction(sig, &sa, NULL); \ | |
95 | } while(0) | |
96 | ||
97 | /* Version information */ | |
98 | char *Version = "@(#) init " VERSION " " DATE " miquels@cistron.nl"; | |
99 | char *bootmsg = "version " VERSION " %s"; | |
100 | #define E_VERSION "INIT_VERSION=sysvinit-" VERSION | |
101 | ||
102 | CHILD *family = NULL; /* The linked list of all entries */ | |
103 | CHILD *newFamily = NULL; /* The list after inittab re-read */ | |
104 | ||
105 | CHILD ch_emerg = { /* Emergency shell */ | |
106 | WAITING, 0, 0, 0, 0, | |
107 | "~~", | |
108 | "S", | |
109 | 3, | |
110 | "/sbin/sulogin", | |
111 | NULL, | |
112 | NULL | |
113 | }; | |
114 | ||
115 | char runlevel = 'S'; /* The current run level */ | |
116 | char thislevel = 'S'; /* The current runlevel */ | |
117 | char prevlevel = 'N'; /* Previous runlevel */ | |
118 | int dfl_level = 0; /* Default runlevel */ | |
119 | sig_atomic_t got_cont = 0; /* Set if we received the SIGCONT signal */ | |
120 | sig_atomic_t got_signals; /* Set if we received a signal. */ | |
121 | int emerg_shell = 0; /* Start emergency shell? */ | |
122 | int wrote_wtmp_reboot = 1; /* Set when we wrote the reboot record */ | |
123 | int wrote_utmp_reboot = 1; /* Set when we wrote the reboot record */ | |
124 | int sltime = 5; /* Sleep time between TERM and KILL */ | |
125 | char *argv0; /* First arguments; show up in ps listing */ | |
126 | int maxproclen; /* Maximal length of argv[0] with \0 */ | |
127 | struct utmp utproto; /* Only used for sizeof(utproto.ut_id) */ | |
128 | char *console_dev; /* Console device. */ | |
129 | int pipe_fd = -1; /* /dev/initctl */ | |
130 | int did_boot = 0; /* Did we already do BOOT* stuff? */ | |
131 | int main(int, char **); | |
132 | ||
133 | /* Used by re-exec part */ | |
134 | int reload = 0; /* Should we do initialization stuff? */ | |
135 | char *myname="/sbin/init"; /* What should we exec */ | |
136 | int oops_error; /* Used by some of the re-exec code. */ | |
137 | const char *Signature = "12567362"; /* Signature for re-exec fd */ | |
138 | ||
139 | /* Macro to see if this is a special action */ | |
140 | #define ISPOWER(i) ((i) == POWERWAIT || (i) == POWERFAIL || \ | |
141 | (i) == POWEROKWAIT || (i) == POWERFAILNOW || \ | |
142 | (i) == CTRLALTDEL) | |
143 | ||
144 | /* ascii values for the `action' field. */ | |
145 | struct actions { | |
146 | char *name; | |
147 | int act; | |
148 | } actions[] = { | |
149 | { "respawn", RESPAWN }, | |
150 | { "wait", WAIT }, | |
151 | { "once", ONCE }, | |
152 | { "boot", BOOT }, | |
153 | { "bootwait", BOOTWAIT }, | |
154 | { "powerfail", POWERFAIL }, | |
155 | { "powerfailnow",POWERFAILNOW }, | |
156 | { "powerwait", POWERWAIT }, | |
157 | { "powerokwait", POWEROKWAIT }, | |
158 | { "ctrlaltdel", CTRLALTDEL }, | |
159 | { "off", OFF }, | |
160 | { "ondemand", ONDEMAND }, | |
161 | { "initdefault", INITDEFAULT }, | |
162 | { "sysinit", SYSINIT }, | |
163 | { "kbrequest", KBREQUEST }, | |
164 | { NULL, 0 }, | |
165 | }; | |
166 | ||
167 | /* | |
168 | * State parser token table (see receive_state) | |
169 | */ | |
170 | struct { | |
171 | char name[4]; | |
172 | int cmd; | |
173 | } cmds[] = { | |
174 | { "VER", C_VER }, | |
175 | { "END", C_END }, | |
176 | { "REC", C_REC }, | |
177 | { "EOR", C_EOR }, | |
178 | { "LEV", C_LEV }, | |
179 | { "FL ", C_FLAG }, | |
180 | { "AC ", C_ACTION }, | |
181 | { "CMD", C_PROCESS }, | |
182 | { "PID", C_PID }, | |
183 | { "EXS", C_EXS }, | |
184 | { "-RL", D_RUNLEVEL }, | |
185 | { "-TL", D_THISLEVEL }, | |
186 | { "-PL", D_PREVLEVEL }, | |
187 | { "-SI", D_GOTSIGN }, | |
188 | { "-WR", D_WROTE_WTMP_REBOOT}, | |
189 | { "-WU", D_WROTE_UTMP_REBOOT}, | |
190 | { "-ST", D_SLTIME }, | |
191 | { "-DB", D_DIDBOOT }, | |
192 | { "", 0 } | |
193 | }; | |
194 | struct { | |
195 | char *name; | |
196 | int mask; | |
197 | } flags[]={ | |
198 | {"RU",RUNNING}, | |
199 | {"DE",DEMAND}, | |
200 | {"XD",XECUTED}, | |
201 | {"WT",WAITING}, | |
202 | {NULL,0} | |
203 | }; | |
204 | ||
205 | #define NR_EXTRA_ENV 16 | |
206 | char *extra_env[NR_EXTRA_ENV]; | |
207 | ||
208 | ||
209 | /* | |
210 | * Sleep a number of seconds. | |
211 | * | |
212 | * This only works correctly because the linux select updates | |
213 | * the elapsed time in the struct timeval passed to select! | |
214 | */ | |
215 | void do_sleep(int sec) | |
216 | { | |
217 | struct timeval tv; | |
218 | ||
219 | tv.tv_sec = sec; | |
220 | tv.tv_usec = 0; | |
221 | ||
222 | while(select(0, NULL, NULL, NULL, &tv) < 0 && errno == EINTR) | |
223 | ; | |
224 | } | |
225 | ||
226 | ||
227 | /* | |
228 | * Non-failing allocation routines (init cannot fail). | |
229 | */ | |
230 | void *imalloc(size_t size) | |
231 | { | |
232 | void *m; | |
233 | ||
234 | while ((m = malloc(size)) == NULL) { | |
235 | initlog(L_VB, "out of memory"); | |
236 | do_sleep(5); | |
237 | } | |
238 | memset(m, 0, size); | |
239 | return m; | |
240 | } | |
241 | ||
242 | ||
243 | char *istrdup(char *s) | |
244 | { | |
245 | char *m; | |
246 | int l; | |
247 | ||
248 | l = strlen(s) + 1; | |
249 | m = imalloc(l); | |
250 | memcpy(m, s, l); | |
251 | return m; | |
252 | } | |
253 | ||
254 | ||
255 | /* | |
256 | * Send the state info of the previous running init to | |
257 | * the new one, in a version-independant way. | |
258 | */ | |
259 | void send_state(int fd) | |
260 | { | |
261 | FILE *fp; | |
262 | CHILD *p; | |
263 | int i,val; | |
264 | ||
265 | fp = fdopen(fd,"w"); | |
266 | ||
267 | fprintf(fp, "VER%s\n", Version); | |
268 | fprintf(fp, "-RL%c\n", runlevel); | |
269 | fprintf(fp, "-TL%c\n", thislevel); | |
270 | fprintf(fp, "-PL%c\n", prevlevel); | |
271 | fprintf(fp, "-SI%u\n", got_signals); | |
272 | fprintf(fp, "-WR%d\n", wrote_wtmp_reboot); | |
273 | fprintf(fp, "-WU%d\n", wrote_utmp_reboot); | |
274 | fprintf(fp, "-ST%d\n", sltime); | |
275 | fprintf(fp, "-DB%d\n", did_boot); | |
276 | ||
277 | for (p = family; p; p = p->next) { | |
278 | fprintf(fp, "REC%s\n", p->id); | |
279 | fprintf(fp, "LEV%s\n", p->rlevel); | |
280 | for (i = 0, val = p->flags; flags[i].mask; i++) | |
281 | if (val & flags[i].mask) { | |
282 | val &= ~flags[i].mask; | |
283 | fprintf(fp, "FL %s\n",flags[i].name); | |
284 | } | |
285 | fprintf(fp, "PID%d\n",p->pid); | |
286 | fprintf(fp, "EXS%u\n",p->exstat); | |
287 | for(i = 0; actions[i].act; i++) | |
288 | if (actions[i].act == p->action) { | |
289 | fprintf(fp, "AC %s\n", actions[i].name); | |
290 | break; | |
291 | } | |
292 | fprintf(fp, "CMD%s\n", p->process); | |
293 | fprintf(fp, "EOR\n"); | |
294 | } | |
295 | fprintf(fp, "END\n"); | |
296 | fclose(fp); | |
297 | } | |
298 | ||
299 | /* | |
300 | * Read a string from a file descriptor. | |
301 | * FIXME: why not use fgets() ? | |
302 | */ | |
303 | static int get_string(char *p, int size, FILE *f) | |
304 | { | |
305 | int c; | |
306 | ||
307 | while ((c = getc(f)) != EOF && c != '\n') { | |
308 | if (--size > 0) | |
309 | *p++ = c; | |
310 | } | |
311 | *p = '\0'; | |
312 | return (c != EOF) && (size > 0); | |
313 | } | |
314 | ||
315 | /* | |
316 | * Read trailing data from the state pipe until we see a newline. | |
317 | */ | |
318 | static int get_void(FILE *f) | |
319 | { | |
320 | int c; | |
321 | ||
322 | while ((c = getc(f)) != EOF && c != '\n') | |
323 | ; | |
324 | ||
325 | return (c != EOF); | |
326 | } | |
327 | ||
328 | /* | |
329 | * Read the next "command" from the state pipe. | |
330 | */ | |
331 | static int get_cmd(FILE *f) | |
332 | { | |
333 | char cmd[4] = " "; | |
334 | int i; | |
335 | ||
336 | if (fread(cmd, 1, sizeof(cmd) - 1, f) != sizeof(cmd) - 1) | |
337 | return C_EOF; | |
338 | ||
339 | for(i = 0; cmds[i].cmd && strcmp(cmds[i].name, cmd) != 0; i++) | |
340 | ; | |
341 | return cmds[i].cmd; | |
342 | } | |
343 | ||
344 | /* | |
345 | * Read a CHILD * from the state pipe. | |
346 | */ | |
347 | static CHILD *get_record(FILE *f) | |
348 | { | |
349 | int cmd; | |
350 | char s[32]; | |
351 | int i; | |
352 | CHILD *p; | |
353 | ||
354 | do { | |
355 | switch (cmd = get_cmd(f)) { | |
356 | case C_END: | |
357 | get_void(f); | |
358 | return NULL; | |
359 | case 0: | |
360 | get_void(f); | |
361 | break; | |
362 | case C_REC: | |
363 | break; | |
364 | case D_RUNLEVEL: | |
365 | fscanf(f, "%c\n", &runlevel); | |
366 | break; | |
367 | case D_THISLEVEL: | |
368 | fscanf(f, "%c\n", &thislevel); | |
369 | break; | |
370 | case D_PREVLEVEL: | |
371 | fscanf(f, "%c\n", &prevlevel); | |
372 | break; | |
373 | case D_GOTSIGN: | |
374 | fscanf(f, "%u\n", &got_signals); | |
375 | break; | |
376 | case D_WROTE_WTMP_REBOOT: | |
377 | fscanf(f, "%d\n", &wrote_wtmp_reboot); | |
378 | break; | |
379 | case D_WROTE_UTMP_REBOOT: | |
380 | fscanf(f, "%d\n", &wrote_utmp_reboot); | |
381 | break; | |
382 | case D_SLTIME: | |
383 | fscanf(f, "%d\n", &sltime); | |
384 | break; | |
385 | case D_DIDBOOT: | |
386 | fscanf(f, "%d\n", &did_boot); | |
387 | break; | |
388 | default: | |
389 | if (cmd > 0 || cmd == C_EOF) { | |
390 | oops_error = -1; | |
391 | return NULL; | |
392 | } | |
393 | } | |
394 | } while (cmd != C_REC); | |
395 | ||
396 | p = imalloc(sizeof(CHILD)); | |
397 | get_string(p->id, sizeof(p->id), f); | |
398 | ||
399 | do switch(cmd = get_cmd(f)) { | |
400 | case 0: | |
401 | case C_EOR: | |
402 | get_void(f); | |
403 | break; | |
404 | case C_PID: | |
405 | fscanf(f, "%d\n", &(p->pid)); | |
406 | break; | |
407 | case C_EXS: | |
408 | fscanf(f, "%u\n", &(p->exstat)); | |
409 | break; | |
410 | case C_LEV: | |
411 | get_string(p->rlevel, sizeof(p->rlevel), f); | |
412 | break; | |
413 | case C_PROCESS: | |
414 | get_string(p->process, sizeof(p->process), f); | |
415 | break; | |
416 | case C_FLAG: | |
417 | get_string(s, sizeof(s), f); | |
418 | for(i = 0; flags[i].name; i++) { | |
419 | if (strcmp(flags[i].name,s) == 0) | |
420 | break; | |
421 | } | |
422 | p->flags |= flags[i].mask; | |
423 | break; | |
424 | case C_ACTION: | |
425 | get_string(s, sizeof(s), f); | |
426 | for(i = 0; actions[i].name; i++) { | |
427 | if (strcmp(actions[i].name, s) == 0) | |
428 | break; | |
429 | } | |
430 | p->action = actions[i].act ? actions[i].act : OFF; | |
431 | break; | |
432 | default: | |
433 | free(p); | |
434 | oops_error = -1; | |
435 | return NULL; | |
436 | } while( cmd != C_EOR); | |
437 | ||
438 | return p; | |
439 | } | |
440 | ||
441 | /* | |
442 | * Read the complete state info from the state pipe. | |
443 | * Returns 0 on success | |
444 | */ | |
445 | int receive_state(int fd) | |
446 | { | |
447 | FILE *f; | |
448 | char old_version[256]; | |
449 | CHILD **pp; | |
450 | ||
451 | f = fdopen(fd, "r"); | |
452 | ||
453 | if (get_cmd(f) != C_VER) | |
454 | return -1; | |
455 | get_string(old_version, sizeof(old_version), f); | |
456 | oops_error = 0; | |
457 | for (pp = &family; (*pp = get_record(f)) != NULL; pp = &((*pp)->next)) | |
458 | ; | |
459 | fclose(f); | |
460 | return oops_error; | |
461 | } | |
462 | ||
463 | /* | |
464 | * Set the process title. | |
465 | */ | |
466 | #ifdef __GNUC__ | |
467 | __attribute__ ((format (printf, 1, 2))) | |
468 | #endif | |
469 | static int setproctitle(char *fmt, ...) | |
470 | { | |
471 | va_list ap; | |
472 | int len; | |
473 | char buf[256]; | |
474 | ||
475 | buf[0] = 0; | |
476 | ||
477 | va_start(ap, fmt); | |
478 | len = vsnprintf(buf, sizeof(buf), fmt, ap); | |
479 | va_end(ap); | |
480 | ||
481 | if (maxproclen > 1) { | |
482 | memset(argv0, 0, maxproclen); | |
483 | strncpy(argv0, buf, maxproclen - 1); | |
484 | } | |
485 | ||
486 | return len; | |
487 | } | |
488 | ||
489 | /* | |
490 | * Set console_dev to a working console. | |
491 | */ | |
492 | void console_init(void) | |
493 | { | |
494 | int fd; | |
495 | int tried_devcons = 0; | |
496 | int tried_vtmaster = 0; | |
497 | char *s; | |
498 | ||
499 | if ((s = getenv("CONSOLE")) != NULL) | |
500 | console_dev = s; | |
501 | else { | |
502 | console_dev = CONSOLE; | |
503 | tried_devcons++; | |
504 | } | |
505 | ||
506 | while ((fd = open(console_dev, O_RDONLY|O_NONBLOCK)) < 0) { | |
507 | if (!tried_devcons) { | |
508 | tried_devcons++; | |
509 | console_dev = CONSOLE; | |
510 | continue; | |
511 | } | |
512 | if (!tried_vtmaster) { | |
513 | tried_vtmaster++; | |
514 | console_dev = VT_MASTER; | |
515 | continue; | |
516 | } | |
517 | break; | |
518 | } | |
519 | if (fd < 0) | |
520 | console_dev = "/dev/null"; | |
521 | else | |
522 | close(fd); | |
523 | } | |
524 | ||
525 | ||
526 | /* | |
527 | * Open the console with retries. | |
528 | */ | |
529 | int console_open(int mode) | |
530 | { | |
531 | int f, fd = -1; | |
532 | int m; | |
533 | ||
534 | /* | |
535 | * Open device in nonblocking mode. | |
536 | */ | |
537 | m = mode | O_NONBLOCK; | |
538 | ||
539 | /* | |
540 | * Retry the open five times. | |
541 | */ | |
542 | for(f = 0; f < 5; f++) { | |
543 | if ((fd = open(console_dev, m)) >= 0) break; | |
544 | usleep(100); | |
545 | } | |
546 | ||
547 | if (fd < 0) return fd; | |
548 | ||
549 | /* | |
550 | * Set original flags. | |
551 | */ | |
552 | if (m != mode) | |
553 | fcntl(fd, F_SETFL, mode); | |
554 | return fd; | |
555 | } | |
556 | ||
557 | /* | |
558 | * We got a signal (HUP PWR WINCH ALRM INT) | |
559 | */ | |
560 | void signal_handler(int sig) | |
561 | { | |
562 | ADDSET(got_signals, sig); | |
563 | } | |
564 | ||
565 | /* | |
566 | * SIGCHLD: one of our children has died. | |
567 | */ | |
568 | void chld_handler() | |
569 | { | |
570 | CHILD *ch; | |
571 | int pid, st; | |
572 | int saved_errno = errno; | |
573 | ||
574 | /* | |
575 | * Find out which process(es) this was (were) | |
576 | */ | |
577 | while((pid = waitpid(-1, &st, WNOHANG)) != 0) { | |
578 | if (errno == ECHILD) break; | |
579 | for( ch = family; ch; ch = ch->next ) | |
580 | if ( ch->pid == pid && (ch->flags & RUNNING) ) { | |
581 | INITDBG(L_VB, | |
582 | "chld_handler: marked %d as zombie", | |
583 | ch->pid); | |
584 | ADDSET(got_signals, SIGCHLD); | |
585 | ch->exstat = st; | |
586 | ch->flags |= ZOMBIE; | |
587 | if (ch->new) { | |
588 | ch->new->exstat = st; | |
589 | ch->new->flags |= ZOMBIE; | |
590 | } | |
591 | break; | |
592 | } | |
593 | if (ch == NULL) { | |
594 | INITDBG(L_VB, "chld_handler: unknown child %d exited.", | |
595 | pid); | |
596 | } | |
597 | } | |
598 | errno = saved_errno; | |
599 | } | |
600 | ||
601 | /* | |
602 | * Linux ignores all signals sent to init when the | |
603 | * SIG_DFL handler is installed. Therefore we must catch SIGTSTP | |
604 | * and SIGCONT, or else they won't work.... | |
605 | * | |
606 | * The SIGCONT handler | |
607 | */ | |
608 | void cont_handler() | |
609 | { | |
610 | got_cont = 1; | |
611 | } | |
612 | ||
613 | /* | |
614 | * Fork and dump core in /. | |
615 | */ | |
616 | void coredump(void) | |
617 | { | |
618 | static int dumped = 0; | |
619 | struct rlimit rlim; | |
620 | sigset_t mask; | |
621 | ||
622 | if (dumped) return; | |
623 | dumped = 1; | |
624 | ||
625 | if (fork() != 0) return; | |
626 | ||
627 | sigfillset(&mask); | |
628 | sigprocmask(SIG_SETMASK, &mask, NULL); | |
629 | ||
630 | rlim.rlim_cur = RLIM_INFINITY; | |
631 | rlim.rlim_max = RLIM_INFINITY; | |
632 | setrlimit(RLIMIT_CORE, &rlim); | |
633 | chdir("/"); | |
634 | ||
635 | signal(SIGSEGV, SIG_DFL); | |
636 | raise(SIGSEGV); | |
637 | sigdelset(&mask, SIGSEGV); | |
638 | sigprocmask(SIG_SETMASK, &mask, NULL); | |
639 | ||
640 | do_sleep(5); | |
641 | exit(0); | |
642 | } | |
643 | ||
644 | /* | |
645 | * OOPS: segmentation violation! | |
646 | * If we have the info, print where it occured. | |
647 | * Then sleep 30 seconds and try to continue. | |
648 | */ | |
649 | #if defined(STACK_DEBUG) && defined(__linux__) | |
650 | void segv_handler(int sig, struct sigcontext ctx) | |
651 | { | |
652 | char *p = ""; | |
653 | int saved_errno = errno; | |
654 | ||
655 | if ((void *)ctx.eip >= (void *)do_sleep && | |
656 | (void *)ctx.eip < (void *)main) | |
657 | p = " (code)"; | |
658 | initlog(L_VB, "PANIC: segmentation violation at %p%s! " | |
659 | "sleeping for 30 seconds.", (void *)ctx.eip, p); | |
660 | coredump(); | |
661 | do_sleep(30); | |
662 | errno = saved_errno; | |
663 | } | |
664 | #else | |
665 | void segv_handler() | |
666 | { | |
667 | int saved_errno = errno; | |
668 | ||
669 | initlog(L_VB, | |
670 | "PANIC: segmentation violation! sleeping for 30 seconds."); | |
671 | coredump(); | |
672 | do_sleep(30); | |
673 | errno = saved_errno; | |
674 | } | |
675 | #endif | |
676 | ||
677 | /* | |
678 | * The SIGSTOP & SIGTSTP handler | |
679 | */ | |
680 | void stop_handler() | |
681 | { | |
682 | int saved_errno = errno; | |
683 | ||
684 | got_cont = 0; | |
685 | while(!got_cont) pause(); | |
686 | got_cont = 0; | |
687 | errno = saved_errno; | |
688 | } | |
689 | ||
690 | /* | |
691 | * Set terminal settings to reasonable defaults | |
692 | */ | |
693 | void console_stty(void) | |
694 | { | |
695 | struct termios tty; | |
696 | int fd; | |
697 | ||
698 | if ((fd = console_open(O_RDWR|O_NOCTTY)) < 0) { | |
699 | initlog(L_VB, "can't open %s", console_dev); | |
700 | return; | |
701 | } | |
702 | ||
703 | (void) tcgetattr(fd, &tty); | |
704 | ||
705 | tty.c_cflag &= CBAUD|CBAUDEX|CSIZE|CSTOPB|PARENB|PARODD; | |
706 | tty.c_cflag |= HUPCL|CLOCAL|CREAD; | |
707 | ||
708 | tty.c_cc[VINTR] = 3; /* ctrl('c') */ | |
709 | tty.c_cc[VQUIT] = 28; /* ctrl('\\') */ | |
710 | tty.c_cc[VERASE] = 127; | |
711 | tty.c_cc[VKILL] = 24; /* ctrl('x') */ | |
712 | tty.c_cc[VEOF] = 4; /* ctrl('d') */ | |
713 | tty.c_cc[VTIME] = 0; | |
714 | tty.c_cc[VMIN] = 1; | |
715 | tty.c_cc[VSTART] = 17; /* ctrl('q') */ | |
716 | tty.c_cc[VSTOP] = 19; /* ctrl('s') */ | |
717 | tty.c_cc[VSUSP] = 26; /* ctrl('z') */ | |
718 | ||
719 | /* | |
720 | * Set pre and post processing | |
721 | */ | |
722 | tty.c_iflag = IGNPAR|ICRNL|IXON|IXANY | |
723 | #ifdef IUTF8 /* Not defined on FreeBSD */ | |
724 | | (tty.c_iflag & IUTF8) | |
725 | #endif /* IUTF8 */ | |
726 | ; | |
727 | tty.c_oflag = OPOST|ONLCR; | |
728 | tty.c_lflag = ISIG|ICANON|ECHO|ECHOCTL|ECHOPRT|ECHOKE; | |
729 | ||
730 | /* | |
731 | * Now set the terminal line. | |
732 | * We don't care about non-transmitted output data | |
733 | * and non-read input data. | |
734 | */ | |
735 | (void) tcsetattr(fd, TCSANOW, &tty); | |
736 | (void) tcflush(fd, TCIOFLUSH); | |
737 | (void) close(fd); | |
738 | } | |
739 | ||
740 | /* | |
741 | * Print to the system console | |
742 | */ | |
743 | void print(char *s) | |
744 | { | |
745 | int fd; | |
746 | ||
747 | if ((fd = console_open(O_WRONLY|O_NOCTTY|O_NDELAY)) >= 0) { | |
748 | write(fd, s, strlen(s)); | |
749 | close(fd); | |
750 | } | |
751 | } | |
752 | ||
753 | /* | |
754 | * Log something to a logfile and the console. | |
755 | */ | |
756 | #ifdef __GNUC__ | |
757 | __attribute__ ((format (printf, 2, 3))) | |
758 | #endif | |
759 | void initlog(int loglevel, char *s, ...) | |
760 | { | |
761 | va_list va_alist; | |
762 | char buf[256]; | |
763 | sigset_t nmask, omask; | |
764 | ||
765 | va_start(va_alist, s); | |
766 | vsnprintf(buf, sizeof(buf), s, va_alist); | |
767 | va_end(va_alist); | |
768 | ||
769 | if (loglevel & L_SY) { | |
770 | /* | |
771 | * Re-establish connection with syslogd every time. | |
772 | * Block signals while talking to syslog. | |
773 | */ | |
774 | sigfillset(&nmask); | |
775 | sigprocmask(SIG_BLOCK, &nmask, &omask); | |
776 | openlog("init", 0, LOG_DAEMON); | |
777 | syslog(LOG_INFO, "%s", buf); | |
778 | closelog(); | |
779 | sigprocmask(SIG_SETMASK, &omask, NULL); | |
780 | } | |
781 | ||
782 | /* | |
783 | * And log to the console. | |
784 | */ | |
785 | if (loglevel & L_CO) { | |
786 | print("\rINIT: "); | |
787 | print(buf); | |
788 | print("\r\n"); | |
789 | } | |
790 | } | |
791 | ||
792 | ||
793 | /* | |
794 | * Build a new environment for execve(). | |
795 | */ | |
796 | char **init_buildenv(int child) | |
797 | { | |
798 | char i_lvl[] = "RUNLEVEL=x"; | |
799 | char i_prev[] = "PREVLEVEL=x"; | |
800 | char i_cons[32]; | |
801 | char **e; | |
802 | int n, i; | |
803 | ||
804 | for (n = 0; environ[n]; n++) | |
805 | ; | |
806 | n += NR_EXTRA_ENV + 8; | |
807 | e = calloc(n, sizeof(char *)); | |
808 | ||
809 | for (n = 0; environ[n]; n++) | |
810 | e[n] = istrdup(environ[n]); | |
811 | ||
812 | for (i = 0; i < NR_EXTRA_ENV; i++) | |
813 | if (extra_env[i]) | |
814 | e[n++] = istrdup(extra_env[i]); | |
815 | ||
816 | if (child) { | |
817 | snprintf(i_cons, sizeof(i_cons), "CONSOLE=%s", console_dev); | |
818 | i_lvl[9] = thislevel; | |
819 | i_prev[10] = prevlevel; | |
820 | e[n++] = istrdup(i_lvl); | |
821 | e[n++] = istrdup(i_prev); | |
822 | e[n++] = istrdup(i_cons); | |
823 | e[n++] = istrdup(E_VERSION); | |
824 | } | |
825 | ||
826 | e[n++] = NULL; | |
827 | ||
828 | return e; | |
829 | } | |
830 | ||
831 | ||
832 | void init_freeenv(char **e) | |
833 | { | |
834 | int n; | |
835 | ||
836 | for (n = 0; e[n]; n++) | |
837 | free(e[n]); | |
838 | free(e); | |
839 | } | |
840 | ||
841 | ||
842 | /* | |
843 | * Fork and execute. | |
844 | * | |
845 | * This function is too long and indents too deep. | |
846 | * | |
847 | */ | |
848 | int spawn(CHILD *ch, int *res) | |
849 | { | |
850 | char *args[16]; /* Argv array */ | |
851 | char buf[136]; /* Line buffer */ | |
852 | int f, st, rc; /* Scratch variables */ | |
853 | char *ptr; /* Ditto */ | |
854 | time_t t; /* System time */ | |
855 | int oldAlarm; /* Previous alarm value */ | |
856 | char *proc = ch->process; /* Command line */ | |
857 | pid_t pid, pgrp; /* child, console process group. */ | |
858 | sigset_t nmask, omask; /* For blocking SIGCHLD */ | |
859 | struct sigaction sa; | |
860 | ||
861 | *res = -1; | |
862 | buf[sizeof(buf) - 1] = 0; | |
863 | ||
864 | /* Skip '+' if it's there */ | |
865 | if (proc[0] == '+') proc++; | |
866 | ||
867 | ch->flags |= XECUTED; | |
868 | ||
869 | if (ch->action == RESPAWN || ch->action == ONDEMAND) { | |
870 | /* Is the date stamp from less than 2 minutes ago? */ | |
871 | time(&t); | |
872 | if (ch->tm + TESTTIME > t) { | |
873 | ch->count++; | |
874 | } else { | |
875 | ch->count = 0; | |
876 | ch->tm = t; | |
877 | } | |
878 | ||
879 | /* Do we try to respawn too fast? */ | |
880 | if (ch->count >= MAXSPAWN) { | |
881 | ||
882 | initlog(L_VB, | |
883 | "Id \"%s\" respawning too fast: disabled for %d minutes", | |
884 | ch->id, SLEEPTIME / 60); | |
885 | ch->flags &= ~RUNNING; | |
886 | ch->flags |= FAILING; | |
887 | ||
888 | /* Remember the time we stopped */ | |
889 | ch->tm = t; | |
890 | ||
891 | /* Try again in 5 minutes */ | |
892 | oldAlarm = alarm(0); | |
893 | if (oldAlarm > SLEEPTIME || oldAlarm <= 0) oldAlarm = SLEEPTIME; | |
894 | alarm(oldAlarm); | |
895 | return(-1); | |
896 | } | |
897 | } | |
898 | ||
899 | /* See if there is an "initscript" (except in single user mode). */ | |
900 | if (access(INITSCRIPT, R_OK) == 0 && runlevel != 'S') { | |
901 | /* Build command line using "initscript" */ | |
902 | args[1] = SHELL; | |
903 | args[2] = INITSCRIPT; | |
904 | args[3] = ch->id; | |
905 | args[4] = ch->rlevel; | |
906 | args[5] = "unknown"; | |
907 | for(f = 0; actions[f].name; f++) { | |
908 | if (ch->action == actions[f].act) { | |
909 | args[5] = actions[f].name; | |
910 | break; | |
911 | } | |
912 | } | |
913 | args[6] = proc; | |
914 | args[7] = NULL; | |
915 | } else if (strpbrk(proc, "~`!$^&*()=|\\{}[];\"'<>?")) { | |
916 | /* See if we need to fire off a shell for this command */ | |
917 | /* Give command line to shell */ | |
918 | args[1] = SHELL; | |
919 | args[2] = "-c"; | |
920 | strcpy(buf, "exec "); | |
921 | strncat(buf, proc, sizeof(buf) - strlen(buf) - 1); | |
922 | args[3] = buf; | |
923 | args[4] = NULL; | |
924 | } else { | |
925 | /* Split up command line arguments */ | |
926 | buf[0] = 0; | |
927 | strncat(buf, proc, sizeof(buf) - 1); | |
928 | ptr = buf; | |
929 | for(f = 1; f < 15; f++) { | |
930 | /* Skip white space */ | |
931 | while(*ptr == ' ' || *ptr == '\t') ptr++; | |
932 | args[f] = ptr; | |
933 | ||
934 | /* May be trailing space.. */ | |
935 | if (*ptr == 0) break; | |
936 | ||
937 | /* Skip this `word' */ | |
938 | while(*ptr && *ptr != ' ' && *ptr != '\t' && *ptr != '#') | |
939 | ptr++; | |
940 | ||
941 | /* If end-of-line, break */ | |
942 | if (*ptr == '#' || *ptr == 0) { | |
943 | f++; | |
944 | *ptr = 0; | |
945 | break; | |
946 | } | |
947 | /* End word with \0 and continue */ | |
948 | *ptr++ = 0; | |
949 | } | |
950 | args[f] = NULL; | |
951 | } | |
952 | args[0] = args[1]; | |
953 | while(1) { | |
954 | /* | |
955 | * Block sigchild while forking. | |
956 | */ | |
957 | sigemptyset(&nmask); | |
958 | sigaddset(&nmask, SIGCHLD); | |
959 | sigprocmask(SIG_BLOCK, &nmask, &omask); | |
960 | ||
961 | if ((pid = fork()) == 0) { | |
962 | ||
963 | close(0); | |
964 | close(1); | |
965 | close(2); | |
966 | if (pipe_fd >= 0) close(pipe_fd); | |
967 | ||
968 | sigprocmask(SIG_SETMASK, &omask, NULL); | |
969 | ||
970 | /* | |
971 | * In sysinit, boot, bootwait or single user mode: | |
972 | * for any wait-type subprocess we _force_ the console | |
973 | * to be its controlling tty. | |
974 | */ | |
975 | if (strchr("*#sS", runlevel) && ch->flags & WAITING) { | |
976 | /* | |
977 | * We fork once extra. This is so that we can | |
978 | * wait and change the process group and session | |
979 | * of the console after exit of the leader. | |
980 | */ | |
981 | setsid(); | |
982 | if ((f = console_open(O_RDWR|O_NOCTTY)) >= 0) { | |
983 | /* Take over controlling tty by force */ | |
984 | (void)ioctl(f, TIOCSCTTY, 1); | |
985 | dup(f); | |
986 | dup(f); | |
987 | } | |
988 | SETSIG(sa, SIGCHLD, SIG_DFL, SA_RESTART); | |
989 | if ((pid = fork()) < 0) { | |
990 | initlog(L_VB, "cannot fork: %s", | |
991 | strerror(errno)); | |
992 | exit(1); | |
993 | } | |
994 | if (pid > 0) { | |
995 | /* | |
996 | * Ignore keyboard signals etc. | |
997 | * Then wait for child to exit. | |
998 | */ | |
999 | SETSIG(sa, SIGINT, SIG_IGN, SA_RESTART); | |
1000 | SETSIG(sa, SIGTSTP, SIG_IGN, SA_RESTART); | |
1001 | SETSIG(sa, SIGQUIT, SIG_IGN, SA_RESTART); | |
1002 | ||
1003 | while ((rc = waitpid(pid, &st, 0)) != pid) | |
1004 | if (rc < 0 && errno == ECHILD) | |
1005 | break; | |
1006 | ||
1007 | /* | |
1008 | * Small optimization. See if stealing | |
1009 | * controlling tty back is needed. | |
1010 | */ | |
1011 | pgrp = tcgetpgrp(f); | |
1012 | if (pgrp != getpid()) | |
1013 | exit(0); | |
1014 | ||
1015 | /* | |
1016 | * Steal controlling tty away. We do | |
1017 | * this with a temporary process. | |
1018 | */ | |
1019 | if ((pid = fork()) < 0) { | |
1020 | initlog(L_VB, "cannot fork: %s", | |
1021 | strerror(errno)); | |
1022 | exit(1); | |
1023 | } | |
1024 | if (pid == 0) { | |
1025 | setsid(); | |
1026 | (void)ioctl(f, TIOCSCTTY, 1); | |
1027 | exit(0); | |
1028 | } | |
1029 | while((rc = waitpid(pid, &st, 0)) != pid) | |
1030 | if (rc < 0 && errno == ECHILD) | |
1031 | break; | |
1032 | exit(0); | |
1033 | } | |
1034 | ||
1035 | /* Set ioctl settings to default ones */ | |
1036 | console_stty(); | |
1037 | ||
1038 | } else { | |
1039 | setsid(); | |
1040 | if ((f = console_open(O_RDWR|O_NOCTTY)) < 0) { | |
1041 | initlog(L_VB, "open(%s): %s", console_dev, | |
1042 | strerror(errno)); | |
1043 | f = open("/dev/null", O_RDWR); | |
1044 | } | |
1045 | dup(f); | |
1046 | dup(f); | |
1047 | } | |
1048 | ||
1049 | /* Reset all the signals, set up environment */ | |
1050 | for(f = 1; f < NSIG; f++) SETSIG(sa, f, SIG_DFL, SA_RESTART); | |
1051 | environ = init_buildenv(1); | |
1052 | ||
1053 | /* | |
1054 | * Execute prog. In case of ENOEXEC try again | |
1055 | * as a shell script. | |
1056 | */ | |
1057 | execvp(args[1], args + 1); | |
1058 | if (errno == ENOEXEC) { | |
1059 | args[1] = SHELL; | |
1060 | args[2] = "-c"; | |
1061 | strcpy(buf, "exec "); | |
1062 | strncat(buf, proc, sizeof(buf) - strlen(buf) - 1); | |
1063 | args[3] = buf; | |
1064 | args[4] = NULL; | |
1065 | execvp(args[1], args + 1); | |
1066 | } | |
1067 | initlog(L_VB, "cannot execute \"%s\"", args[1]); | |
1068 | exit(1); | |
1069 | } | |
1070 | *res = pid; | |
1071 | sigprocmask(SIG_SETMASK, &omask, NULL); | |
1072 | ||
1073 | INITDBG(L_VB, "Started id %s (pid %d)", ch->id, pid); | |
1074 | ||
1075 | if (pid == -1) { | |
1076 | initlog(L_VB, "cannot fork, retry.."); | |
1077 | do_sleep(5); | |
1078 | continue; | |
1079 | } | |
1080 | return(pid); | |
1081 | } | |
1082 | } | |
1083 | ||
1084 | /* | |
1085 | * Start a child running! | |
1086 | */ | |
1087 | void startup(CHILD *ch) | |
1088 | { | |
1089 | /* | |
1090 | * See if it's disabled | |
1091 | */ | |
1092 | if (ch->flags & FAILING) return; | |
1093 | ||
1094 | switch(ch->action) { | |
1095 | ||
1096 | case SYSINIT: | |
1097 | case BOOTWAIT: | |
1098 | case WAIT: | |
1099 | case POWERWAIT: | |
1100 | case POWERFAILNOW: | |
1101 | case POWEROKWAIT: | |
1102 | case CTRLALTDEL: | |
1103 | if (!(ch->flags & XECUTED)) ch->flags |= WAITING; | |
1104 | case KBREQUEST: | |
1105 | case BOOT: | |
1106 | case POWERFAIL: | |
1107 | case ONCE: | |
1108 | if (ch->flags & XECUTED) break; | |
1109 | case ONDEMAND: | |
1110 | case RESPAWN: | |
1111 | ch->flags |= RUNNING; | |
1112 | if (spawn(ch, &(ch->pid)) < 0) break; | |
1113 | /* | |
1114 | * Do NOT log if process field starts with '+' | |
1115 | * FIXME: that's for compatibility with *very* | |
1116 | * old getties - probably it can be taken out. | |
1117 | */ | |
1118 | if (ch->process[0] != '+') | |
1119 | write_utmp_wtmp("", ch->id, ch->pid, | |
1120 | INIT_PROCESS, ""); | |
1121 | break; | |
1122 | } | |
1123 | } | |
1124 | ||
1125 | ||
1126 | /* | |
1127 | * Read the inittab file. | |
1128 | */ | |
1129 | void read_inittab(void) | |
1130 | { | |
1131 | FILE *fp; /* The INITTAB file */ | |
1132 | CHILD *ch, *old, *i; /* Pointers to CHILD structure */ | |
1133 | CHILD *head = NULL; /* Head of linked list */ | |
1134 | #ifdef INITLVL | |
1135 | struct stat st; /* To stat INITLVL */ | |
1136 | #endif | |
1137 | sigset_t nmask, omask; /* For blocking SIGCHLD. */ | |
1138 | char buf[256]; /* Line buffer */ | |
1139 | char err[64]; /* Error message. */ | |
1140 | char *id, *rlevel, | |
1141 | *action, *process; /* Fields of a line */ | |
1142 | char *p; | |
1143 | int lineNo = 0; /* Line number in INITTAB file */ | |
1144 | int actionNo; /* Decoded action field */ | |
1145 | int f; /* Counter */ | |
1146 | int round; /* round 0 for SIGTERM, 1 for SIGKILL */ | |
1147 | int foundOne = 0; /* No killing no sleep */ | |
1148 | int talk; /* Talk to the user */ | |
1149 | int done = 0; /* Ready yet? */ | |
1150 | ||
1151 | #if DEBUG | |
1152 | if (newFamily != NULL) { | |
1153 | INITDBG(L_VB, "PANIC newFamily != NULL"); | |
1154 | exit(1); | |
1155 | } | |
1156 | INITDBG(L_VB, "Reading inittab"); | |
1157 | #endif | |
1158 | ||
1159 | /* | |
1160 | * Open INITTAB and real line by line. | |
1161 | */ | |
1162 | if ((fp = fopen(INITTAB, "r")) == NULL) | |
1163 | initlog(L_VB, "No inittab file found"); | |
1164 | ||
1165 | while(!done) { | |
1166 | /* | |
1167 | * Add single user shell entry at the end. | |
1168 | */ | |
1169 | if (fp == NULL || fgets(buf, sizeof(buf), fp) == NULL) { | |
1170 | done = 1; | |
1171 | /* | |
1172 | * See if we have a single user entry. | |
1173 | */ | |
1174 | for(old = newFamily; old; old = old->next) | |
1175 | if (strpbrk(old->rlevel, "S")) break; | |
1176 | if (old == NULL) | |
1177 | snprintf(buf, sizeof(buf), "~~:S:wait:%s\n", SULOGIN); | |
1178 | else | |
1179 | continue; | |
1180 | } | |
1181 | lineNo++; | |
1182 | /* | |
1183 | * Skip comments and empty lines | |
1184 | */ | |
1185 | for(p = buf; *p == ' ' || *p == '\t'; p++) | |
1186 | ; | |
1187 | if (*p == '#' || *p == '\n') continue; | |
1188 | ||
1189 | /* | |
1190 | * Decode the fields | |
1191 | */ | |
1192 | id = strsep(&p, ":"); | |
1193 | rlevel = strsep(&p, ":"); | |
1194 | action = strsep(&p, ":"); | |
1195 | process = strsep(&p, "\n"); | |
1196 | ||
1197 | /* | |
1198 | * Check if syntax is OK. Be very verbose here, to | |
1199 | * avoid newbie postings on comp.os.linux.setup :) | |
1200 | */ | |
1201 | err[0] = 0; | |
1202 | if (!id || !*id) strcpy(err, "missing id field"); | |
1203 | if (!rlevel) strcpy(err, "missing runlevel field"); | |
1204 | if (!process) strcpy(err, "missing process field"); | |
1205 | if (!action || !*action) | |
1206 | strcpy(err, "missing action field"); | |
1207 | if (id && strlen(id) > sizeof(utproto.ut_id)) | |
1208 | sprintf(err, "id field too long (max %d characters)", | |
1209 | (int)sizeof(utproto.ut_id)); | |
1210 | if (rlevel && strlen(rlevel) > 11) | |
1211 | strcpy(err, "rlevel field too long (max 11 characters)"); | |
1212 | if (process && strlen(process) > 127) | |
1213 | strcpy(err, "process field too long"); | |
1214 | if (action && strlen(action) > 32) | |
1215 | strcpy(err, "action field too long"); | |
1216 | if (err[0] != 0) { | |
1217 | initlog(L_VB, "%s[%d]: %s", INITTAB, lineNo, err); | |
1218 | INITDBG(L_VB, "%s:%s:%s:%s", id, rlevel, action, process); | |
1219 | continue; | |
1220 | } | |
1221 | ||
1222 | /* | |
1223 | * Decode the "action" field | |
1224 | */ | |
1225 | actionNo = -1; | |
1226 | for(f = 0; actions[f].name; f++) | |
1227 | if (strcasecmp(action, actions[f].name) == 0) { | |
1228 | actionNo = actions[f].act; | |
1229 | break; | |
1230 | } | |
1231 | if (actionNo == -1) { | |
1232 | initlog(L_VB, "%s[%d]: %s: unknown action field", | |
1233 | INITTAB, lineNo, action); | |
1234 | continue; | |
1235 | } | |
1236 | ||
1237 | /* | |
1238 | * See if the id field is unique | |
1239 | */ | |
1240 | for(old = newFamily; old; old = old->next) { | |
1241 | if(strcmp(old->id, id) == 0 && strcmp(id, "~~")) { | |
1242 | initlog(L_VB, "%s[%d]: duplicate ID field \"%s\"", | |
1243 | INITTAB, lineNo, id); | |
1244 | break; | |
1245 | } | |
1246 | } | |
1247 | if (old) continue; | |
1248 | ||
1249 | /* | |
1250 | * Allocate a CHILD structure | |
1251 | */ | |
1252 | ch = imalloc(sizeof(CHILD)); | |
1253 | ||
1254 | /* | |
1255 | * And fill it in. | |
1256 | */ | |
1257 | ch->action = actionNo; | |
1258 | strncpy(ch->id, id, sizeof(utproto.ut_id) + 1); /* Hack for different libs. */ | |
1259 | strncpy(ch->process, process, sizeof(ch->process) - 1); | |
1260 | if (rlevel[0]) { | |
1261 | for(f = 0; f < (int)sizeof(rlevel) - 1 && rlevel[f]; f++) { | |
1262 | ch->rlevel[f] = rlevel[f]; | |
1263 | if (ch->rlevel[f] == 's') ch->rlevel[f] = 'S'; | |
1264 | } | |
1265 | strncpy(ch->rlevel, rlevel, sizeof(ch->rlevel) - 1); | |
1266 | } else { | |
1267 | strcpy(ch->rlevel, "0123456789"); | |
1268 | if (ISPOWER(ch->action)) | |
1269 | strcpy(ch->rlevel, "S0123456789"); | |
1270 | } | |
1271 | /* | |
1272 | * We have the fake runlevel '#' for SYSINIT and | |
1273 | * '*' for BOOT and BOOTWAIT. | |
1274 | */ | |
1275 | if (ch->action == SYSINIT) strcpy(ch->rlevel, "#"); | |
1276 | if (ch->action == BOOT || ch->action == BOOTWAIT) | |
1277 | strcpy(ch->rlevel, "*"); | |
1278 | ||
1279 | /* | |
1280 | * Now add it to the linked list. Special for powerfail. | |
1281 | */ | |
1282 | if (ISPOWER(ch->action)) { | |
1283 | ||
1284 | /* | |
1285 | * Disable by default | |
1286 | */ | |
1287 | ch->flags |= XECUTED; | |
1288 | ||
1289 | /* | |
1290 | * Tricky: insert at the front of the list.. | |
1291 | */ | |
1292 | old = NULL; | |
1293 | for(i = newFamily; i; i = i->next) { | |
1294 | if (!ISPOWER(i->action)) break; | |
1295 | old = i; | |
1296 | } | |
1297 | /* | |
1298 | * Now add after entry "old" | |
1299 | */ | |
1300 | if (old) { | |
1301 | ch->next = i; | |
1302 | old->next = ch; | |
1303 | if (i == NULL) head = ch; | |
1304 | } else { | |
1305 | ch->next = newFamily; | |
1306 | newFamily = ch; | |
1307 | if (ch->next == NULL) head = ch; | |
1308 | } | |
1309 | } else { | |
1310 | /* | |
1311 | * Just add at end of the list | |
1312 | */ | |
1313 | if (ch->action == KBREQUEST) ch->flags |= XECUTED; | |
1314 | ch->next = NULL; | |
1315 | if (head) | |
1316 | head->next = ch; | |
1317 | else | |
1318 | newFamily = ch; | |
1319 | head = ch; | |
1320 | } | |
1321 | ||
1322 | /* | |
1323 | * Walk through the old list comparing id fields | |
1324 | */ | |
1325 | for(old = family; old; old = old->next) | |
1326 | if (strcmp(old->id, ch->id) == 0) { | |
1327 | old->new = ch; | |
1328 | break; | |
1329 | } | |
1330 | } | |
1331 | /* | |
1332 | * We're done. | |
1333 | */ | |
1334 | if (fp) fclose(fp); | |
1335 | ||
1336 | /* | |
1337 | * Loop through the list of children, and see if they need to | |
1338 | * be killed. | |
1339 | */ | |
1340 | ||
1341 | INITDBG(L_VB, "Checking for children to kill"); | |
1342 | for(round = 0; round < 2; round++) { | |
1343 | talk = 1; | |
1344 | for(ch = family; ch; ch = ch->next) { | |
1345 | ch->flags &= ~KILLME; | |
1346 | ||
1347 | /* | |
1348 | * Is this line deleted? | |
1349 | */ | |
1350 | if (ch->new == NULL) ch->flags |= KILLME; | |
1351 | ||
1352 | /* | |
1353 | * If the entry has changed, kill it anyway. Note that | |
1354 | * we do not check ch->process, only the "action" field. | |
1355 | * This way, you can turn an entry "off" immediately, but | |
1356 | * changes in the command line will only become effective | |
1357 | * after the running version has exited. | |
1358 | */ | |
1359 | if (ch->new && ch->action != ch->new->action) ch->flags |= KILLME; | |
1360 | ||
1361 | /* | |
1362 | * Only BOOT processes may live in all levels | |
1363 | */ | |
1364 | if (ch->action != BOOT && | |
1365 | strchr(ch->rlevel, runlevel) == NULL) { | |
1366 | /* | |
1367 | * Ondemand procedures live always, | |
1368 | * except in single user | |
1369 | */ | |
1370 | if (runlevel == 'S' || !(ch->flags & DEMAND)) | |
1371 | ch->flags |= KILLME; | |
1372 | } | |
1373 | ||
1374 | /* | |
1375 | * Now, if this process may live note so in the new list | |
1376 | */ | |
1377 | if ((ch->flags & KILLME) == 0) { | |
1378 | ch->new->flags = ch->flags; | |
1379 | ch->new->pid = ch->pid; | |
1380 | ch->new->exstat = ch->exstat; | |
1381 | continue; | |
1382 | } | |
1383 | ||
1384 | ||
1385 | /* | |
1386 | * Is this process still around? | |
1387 | */ | |
1388 | if ((ch->flags & RUNNING) == 0) { | |
1389 | ch->flags &= ~KILLME; | |
1390 | continue; | |
1391 | } | |
1392 | INITDBG(L_VB, "Killing \"%s\"", ch->process); | |
1393 | switch(round) { | |
1394 | case 0: /* Send TERM signal */ | |
1395 | if (talk) | |
1396 | initlog(L_CO, | |
1397 | "Sending processes the TERM signal"); | |
1398 | kill(-(ch->pid), SIGTERM); | |
1399 | foundOne = 1; | |
1400 | break; | |
1401 | case 1: /* Send KILL signal and collect status */ | |
1402 | if (talk) | |
1403 | initlog(L_CO, | |
1404 | "Sending processes the KILL signal"); | |
1405 | kill(-(ch->pid), SIGKILL); | |
1406 | break; | |
1407 | } | |
1408 | talk = 0; | |
1409 | ||
1410 | } | |
1411 | /* | |
1412 | * See if we have to wait 5 seconds | |
1413 | */ | |
1414 | if (foundOne && round == 0) { | |
1415 | /* | |
1416 | * Yup, but check every second if we still have children. | |
1417 | */ | |
1418 | for(f = 0; f < sltime; f++) { | |
1419 | for(ch = family; ch; ch = ch->next) { | |
1420 | if (!(ch->flags & KILLME)) continue; | |
1421 | if ((ch->flags & RUNNING) && !(ch->flags & ZOMBIE)) | |
1422 | break; | |
1423 | } | |
1424 | if (ch == NULL) { | |
1425 | /* | |
1426 | * No running children, skip SIGKILL | |
1427 | */ | |
1428 | round = 1; | |
1429 | foundOne = 0; /* Skip the sleep below. */ | |
1430 | break; | |
1431 | } | |
1432 | do_sleep(1); | |
1433 | } | |
1434 | } | |
1435 | } | |
1436 | ||
1437 | /* | |
1438 | * Now give all processes the chance to die and collect exit statuses. | |
1439 | */ | |
1440 | if (foundOne) do_sleep(1); | |
1441 | for(ch = family; ch; ch = ch->next) | |
1442 | if (ch->flags & KILLME) { | |
1443 | if (!(ch->flags & ZOMBIE)) | |
1444 | initlog(L_CO, "Pid %d [id %s] seems to hang", ch->pid, | |
1445 | ch->id); | |
1446 | else { | |
1447 | INITDBG(L_VB, "Updating utmp for pid %d [id %s]", | |
1448 | ch->pid, ch->id); | |
1449 | ch->flags &= ~RUNNING; | |
1450 | if (ch->process[0] != '+') | |
1451 | write_utmp_wtmp("", ch->id, ch->pid, DEAD_PROCESS, NULL); | |
1452 | } | |
1453 | } | |
1454 | ||
1455 | /* | |
1456 | * Both rounds done; clean up the list. | |
1457 | */ | |
1458 | sigemptyset(&nmask); | |
1459 | sigaddset(&nmask, SIGCHLD); | |
1460 | sigprocmask(SIG_BLOCK, &nmask, &omask); | |
1461 | for(ch = family; ch; ch = old) { | |
1462 | old = ch->next; | |
1463 | free(ch); | |
1464 | } | |
1465 | family = newFamily; | |
1466 | for(ch = family; ch; ch = ch->next) ch->new = NULL; | |
1467 | newFamily = NULL; | |
1468 | sigprocmask(SIG_SETMASK, &omask, NULL); | |
1469 | ||
1470 | #ifdef INITLVL | |
1471 | /* | |
1472 | * Dispose of INITLVL file. | |
1473 | */ | |
1474 | if (lstat(INITLVL, &st) >= 0 && S_ISLNK(st.st_mode)) { | |
1475 | /* | |
1476 | * INITLVL is a symbolic link, so just truncate the file. | |
1477 | */ | |
1478 | close(open(INITLVL, O_WRONLY|O_TRUNC)); | |
1479 | } else { | |
1480 | /* | |
1481 | * Delete INITLVL file. | |
1482 | */ | |
1483 | unlink(INITLVL); | |
1484 | } | |
1485 | #endif | |
1486 | #ifdef INITLVL2 | |
1487 | /* | |
1488 | * Dispose of INITLVL2 file. | |
1489 | */ | |
1490 | if (lstat(INITLVL2, &st) >= 0 && S_ISLNK(st.st_mode)) { | |
1491 | /* | |
1492 | * INITLVL2 is a symbolic link, so just truncate the file. | |
1493 | */ | |
1494 | close(open(INITLVL2, O_WRONLY|O_TRUNC)); | |
1495 | } else { | |
1496 | /* | |
1497 | * Delete INITLVL2 file. | |
1498 | */ | |
1499 | unlink(INITLVL2); | |
1500 | } | |
1501 | #endif | |
1502 | } | |
1503 | ||
1504 | /* | |
1505 | * Walk through the family list and start up children. | |
1506 | * The entries that do not belong here at all are removed | |
1507 | * from the list. | |
1508 | */ | |
1509 | void start_if_needed(void) | |
1510 | { | |
1511 | CHILD *ch; /* Pointer to child */ | |
1512 | int delete; /* Delete this entry from list? */ | |
1513 | ||
1514 | INITDBG(L_VB, "Checking for children to start"); | |
1515 | ||
1516 | for(ch = family; ch; ch = ch->next) { | |
1517 | ||
1518 | #if DEBUG | |
1519 | if (ch->rlevel[0] == 'C') { | |
1520 | INITDBG(L_VB, "%s: flags %d", ch->process, ch->flags); | |
1521 | } | |
1522 | #endif | |
1523 | ||
1524 | /* Are we waiting for this process? Then quit here. */ | |
1525 | if (ch->flags & WAITING) break; | |
1526 | ||
1527 | /* Already running? OK, don't touch it */ | |
1528 | if (ch->flags & RUNNING) continue; | |
1529 | ||
1530 | /* See if we have to start it up */ | |
1531 | delete = 1; | |
1532 | if (strchr(ch->rlevel, runlevel) || | |
1533 | ((ch->flags & DEMAND) && !strchr("#*Ss", runlevel))) { | |
1534 | startup(ch); | |
1535 | delete = 0; | |
1536 | } | |
1537 | ||
1538 | if (delete) { | |
1539 | /* FIXME: is this OK? */ | |
1540 | ch->flags &= ~(RUNNING|WAITING); | |
1541 | if (!ISPOWER(ch->action) && ch->action != KBREQUEST) | |
1542 | ch->flags &= ~XECUTED; | |
1543 | ch->pid = 0; | |
1544 | } else | |
1545 | /* Do we have to wait for this process? */ | |
1546 | if (ch->flags & WAITING) break; | |
1547 | } | |
1548 | /* Done. */ | |
1549 | } | |
1550 | ||
1551 | /* | |
1552 | * Ask the user on the console for a runlevel | |
1553 | */ | |
1554 | int ask_runlevel(void) | |
1555 | { | |
1556 | const char prompt[] = "\nEnter runlevel: "; | |
1557 | char buf[8]; | |
1558 | int lvl = -1; | |
1559 | int fd; | |
1560 | ||
1561 | console_stty(); | |
1562 | fd = console_open(O_RDWR|O_NOCTTY); | |
1563 | ||
1564 | if (fd < 0) return('S'); | |
1565 | ||
1566 | while(!strchr("0123456789S", lvl)) { | |
1567 | write(fd, prompt, sizeof(prompt) - 1); | |
1568 | buf[0] = 0; | |
1569 | read(fd, buf, sizeof(buf)); | |
1570 | if (buf[0] != 0 && (buf[1] == '\r' || buf[1] == '\n')) | |
1571 | lvl = buf[0]; | |
1572 | if (islower(lvl)) lvl = toupper(lvl); | |
1573 | } | |
1574 | close(fd); | |
1575 | return lvl; | |
1576 | } | |
1577 | ||
1578 | /* | |
1579 | * Search the INITTAB file for the 'initdefault' field, with the default | |
1580 | * runlevel. If this fails, ask the user to supply a runlevel. | |
1581 | */ | |
1582 | int get_init_default(void) | |
1583 | { | |
1584 | CHILD *ch; | |
1585 | int lvl = -1; | |
1586 | char *p; | |
1587 | ||
1588 | /* | |
1589 | * Look for initdefault. | |
1590 | */ | |
1591 | for(ch = family; ch; ch = ch->next) | |
1592 | if (ch->action == INITDEFAULT) { | |
1593 | p = ch->rlevel; | |
1594 | while(*p) { | |
1595 | if (*p > lvl) lvl = *p; | |
1596 | p++; | |
1597 | } | |
1598 | break; | |
1599 | } | |
1600 | /* | |
1601 | * See if level is valid | |
1602 | */ | |
1603 | if (lvl > 0) { | |
1604 | if (islower(lvl)) lvl = toupper(lvl); | |
1605 | if (strchr("0123456789S", lvl) == NULL) { | |
1606 | initlog(L_VB, | |
1607 | "Initdefault level '%c' is invalid", lvl); | |
1608 | lvl = 0; | |
1609 | } | |
1610 | } | |
1611 | /* | |
1612 | * Ask for runlevel on console if needed. | |
1613 | */ | |
1614 | if (lvl <= 0) lvl = ask_runlevel(); | |
1615 | ||
1616 | /* | |
1617 | * Log the fact that we have a runlevel now. | |
1618 | */ | |
1619 | return lvl; | |
1620 | } | |
1621 | ||
1622 | ||
1623 | /* | |
1624 | * We got signaled. | |
1625 | * | |
1626 | * Do actions for the new level. If we are compatible with | |
1627 | * the "old" INITLVL and arg == 0, try to read the new | |
1628 | * runlevel from that file first. | |
1629 | */ | |
1630 | int read_level(int arg) | |
1631 | { | |
1632 | CHILD *ch; /* Walk through list */ | |
1633 | unsigned char foo = 'X'; /* Contents of INITLVL */ | |
1634 | int ok = 1; | |
1635 | #ifdef INITLVL | |
1636 | FILE *fp; | |
1637 | struct stat stt; | |
1638 | int st; | |
1639 | #endif | |
1640 | ||
1641 | if (arg) foo = arg; | |
1642 | ||
1643 | #ifdef INITLVL | |
1644 | ok = 0; | |
1645 | ||
1646 | if (arg == 0) { | |
1647 | fp = NULL; | |
1648 | if (stat(INITLVL, &stt) != 0 || stt.st_size != 0L) | |
1649 | fp = fopen(INITLVL, "r"); | |
1650 | #ifdef INITLVL2 | |
1651 | if (fp == NULL && | |
1652 | (stat(INITLVL2, &stt) != 0 || stt.st_size != 0L)) | |
1653 | fp = fopen(INITLVL2, "r"); | |
1654 | #endif | |
1655 | if (fp == NULL) { | |
1656 | /* INITLVL file empty or not there - act as 'init q' */ | |
1657 | initlog(L_SY, "Re-reading inittab"); | |
1658 | return(runlevel); | |
1659 | } | |
1660 | ok = fscanf(fp, "%c %d", &foo, &st); | |
1661 | fclose(fp); | |
1662 | } else { | |
1663 | /* We go to the new runlevel passed as an argument. */ | |
1664 | foo = arg; | |
1665 | ok = 1; | |
1666 | } | |
1667 | if (ok == 2) sltime = st; | |
1668 | ||
1669 | #endif /* INITLVL */ | |
1670 | ||
1671 | if (islower(foo)) foo = toupper(foo); | |
1672 | if (ok < 1 || ok > 2 || strchr("QS0123456789ABCU", foo) == NULL) { | |
1673 | initlog(L_VB, "bad runlevel: %c", foo); | |
1674 | return runlevel; | |
1675 | } | |
1676 | ||
1677 | /* Log this action */ | |
1678 | switch(foo) { | |
1679 | case 'S': | |
1680 | initlog(L_VB, "Going single user"); | |
1681 | break; | |
1682 | case 'Q': | |
1683 | initlog(L_SY, "Re-reading inittab"); | |
1684 | break; | |
1685 | case 'A': | |
1686 | case 'B': | |
1687 | case 'C': | |
1688 | initlog(L_SY, | |
1689 | "Activating demand-procedures for '%c'", foo); | |
1690 | break; | |
1691 | case 'U': | |
1692 | initlog(L_SY, "Trying to re-exec init"); | |
1693 | return 'U'; | |
1694 | default: | |
1695 | initlog(L_VB, "Switching to runlevel: %c", foo); | |
1696 | } | |
1697 | ||
1698 | if (foo == 'Q') return runlevel; | |
1699 | ||
1700 | /* Check if this is a runlevel a, b or c */ | |
1701 | if (strchr("ABC", foo)) { | |
1702 | if (runlevel == 'S') return(runlevel); | |
1703 | ||
1704 | /* Read inittab again first! */ | |
1705 | read_inittab(); | |
1706 | ||
1707 | /* Mark those special tasks */ | |
1708 | for(ch = family; ch; ch = ch->next) | |
1709 | if (strchr(ch->rlevel, foo) != NULL || | |
1710 | strchr(ch->rlevel, tolower(foo)) != NULL) { | |
1711 | ch->flags |= DEMAND; | |
1712 | ch->flags &= ~XECUTED; | |
1713 | INITDBG(L_VB, | |
1714 | "Marking (%s) as ondemand, flags %d", | |
1715 | ch->id, ch->flags); | |
1716 | } | |
1717 | return runlevel; | |
1718 | } | |
1719 | ||
1720 | /* Store both the old and the new runlevel. */ | |
1721 | write_utmp_wtmp("runlevel", "~~", foo + 256*runlevel, RUN_LVL, "~"); | |
1722 | thislevel = foo; | |
1723 | prevlevel = runlevel; | |
1724 | return foo; | |
1725 | } | |
1726 | ||
1727 | ||
1728 | /* | |
1729 | * This procedure is called after every signal (SIGHUP, SIGALRM..) | |
1730 | * | |
1731 | * Only clear the 'failing' flag if the process is sleeping | |
1732 | * longer than 5 minutes, or inittab was read again due | |
1733 | * to user interaction. | |
1734 | */ | |
1735 | void fail_check(void) | |
1736 | { | |
1737 | CHILD *ch; /* Pointer to child structure */ | |
1738 | time_t t; /* System time */ | |
1739 | time_t next_alarm = 0; /* When to set next alarm */ | |
1740 | ||
1741 | time(&t); | |
1742 | ||
1743 | for(ch = family; ch; ch = ch->next) { | |
1744 | ||
1745 | if (ch->flags & FAILING) { | |
1746 | /* Can we free this sucker? */ | |
1747 | if (ch->tm + SLEEPTIME < t) { | |
1748 | ch->flags &= ~FAILING; | |
1749 | ch->count = 0; | |
1750 | ch->tm = 0; | |
1751 | } else { | |
1752 | /* No, we'll look again later */ | |
1753 | if (next_alarm == 0 || | |
1754 | ch->tm + SLEEPTIME > next_alarm) | |
1755 | next_alarm = ch->tm + SLEEPTIME; | |
1756 | } | |
1757 | } | |
1758 | } | |
1759 | if (next_alarm) { | |
1760 | next_alarm -= t; | |
1761 | if (next_alarm < 1) next_alarm = 1; | |
1762 | alarm(next_alarm); | |
1763 | } | |
1764 | } | |
1765 | ||
1766 | /* Set all 'Fail' timers to 0 */ | |
1767 | void fail_cancel(void) | |
1768 | { | |
1769 | CHILD *ch; | |
1770 | ||
1771 | for(ch = family; ch; ch = ch->next) { | |
1772 | ch->count = 0; | |
1773 | ch->tm = 0; | |
1774 | ch->flags &= ~FAILING; | |
1775 | } | |
1776 | } | |
1777 | ||
1778 | /* | |
1779 | * Start up powerfail entries. | |
1780 | */ | |
1781 | void do_power_fail(int pwrstat) | |
1782 | { | |
1783 | CHILD *ch; | |
1784 | ||
1785 | /* | |
1786 | * Tell powerwait & powerfail entries to start up | |
1787 | */ | |
1788 | for (ch = family; ch; ch = ch->next) { | |
1789 | if (pwrstat == 'O') { | |
1790 | /* | |
1791 | * The power is OK again. | |
1792 | */ | |
1793 | if (ch->action == POWEROKWAIT) | |
1794 | ch->flags &= ~XECUTED; | |
1795 | } else if (pwrstat == 'L') { | |
1796 | /* | |
1797 | * Low battery, shut down now. | |
1798 | */ | |
1799 | if (ch->action == POWERFAILNOW) | |
1800 | ch->flags &= ~XECUTED; | |
1801 | } else { | |
1802 | /* | |
1803 | * Power is failing, shutdown imminent | |
1804 | */ | |
1805 | if (ch->action == POWERFAIL || ch->action == POWERWAIT) | |
1806 | ch->flags &= ~XECUTED; | |
1807 | } | |
1808 | } | |
1809 | } | |
1810 | ||
1811 | /* | |
1812 | * Check for state-pipe presence | |
1813 | */ | |
1814 | int check_pipe(int fd) | |
1815 | { | |
1816 | struct timeval t; | |
1817 | fd_set s; | |
1818 | char signature[8]; | |
1819 | ||
1820 | FD_ZERO(&s); | |
1821 | FD_SET(fd, &s); | |
1822 | t.tv_sec = t.tv_usec = 0; | |
1823 | ||
1824 | if (select(fd+1, &s, NULL, NULL, &t) != 1) | |
1825 | return 0; | |
1826 | if (read(fd, signature, 8) != 8) | |
1827 | return 0; | |
1828 | return strncmp(Signature, signature, 8) == 0; | |
1829 | } | |
1830 | ||
1831 | /* | |
1832 | * Make a state-pipe. | |
1833 | */ | |
1834 | int make_pipe(int fd) | |
1835 | { | |
1836 | int fds[2]; | |
1837 | ||
1838 | pipe(fds); | |
1839 | dup2(fds[0], fd); | |
1840 | close(fds[0]); | |
1841 | fcntl(fds[1], F_SETFD, 1); | |
1842 | fcntl(fd, F_SETFD, 0); | |
1843 | write(fds[1], Signature, 8); | |
1844 | ||
1845 | return fds[1]; | |
1846 | } | |
1847 | ||
1848 | /* | |
1849 | * Attempt to re-exec. | |
1850 | */ | |
1851 | void re_exec(void) | |
1852 | { | |
1853 | CHILD *ch; | |
1854 | sigset_t mask, oldset; | |
1855 | pid_t pid; | |
1856 | char **env; | |
1857 | int fd; | |
1858 | ||
1859 | if (strchr("S0123456",runlevel) == NULL) | |
1860 | return; | |
1861 | ||
1862 | /* | |
1863 | * Reset the alarm, and block all signals. | |
1864 | */ | |
1865 | alarm(0); | |
1866 | sigfillset(&mask); | |
1867 | sigprocmask(SIG_BLOCK, &mask, &oldset); | |
1868 | ||
1869 | /* | |
1870 | * construct a pipe fd --> STATE_PIPE and write a signature | |
1871 | */ | |
1872 | fd = make_pipe(STATE_PIPE); | |
1873 | ||
1874 | /* | |
1875 | * It's a backup day today, so I'm pissed off. Being a BOFH, however, | |
1876 | * does have it's advantages... | |
1877 | */ | |
1878 | fail_cancel(); | |
1879 | close(pipe_fd); | |
1880 | pipe_fd = -1; | |
1881 | DELSET(got_signals, SIGCHLD); | |
1882 | DELSET(got_signals, SIGHUP); | |
1883 | DELSET(got_signals, SIGUSR1); | |
1884 | ||
1885 | /* | |
1886 | * That should be cleaned. | |
1887 | */ | |
1888 | for(ch = family; ch; ch = ch->next) | |
1889 | if (ch->flags & ZOMBIE) { | |
1890 | INITDBG(L_VB, "Child died, PID= %d", ch->pid); | |
1891 | ch->flags &= ~(RUNNING|ZOMBIE|WAITING); | |
1892 | if (ch->process[0] != '+') | |
1893 | write_utmp_wtmp("", ch->id, ch->pid, DEAD_PROCESS, NULL); | |
1894 | } | |
1895 | ||
1896 | if ((pid = fork()) == 0) { | |
1897 | /* | |
1898 | * Child sends state information to the parent. | |
1899 | */ | |
1900 | send_state(fd); | |
1901 | exit(0); | |
1902 | } | |
1903 | ||
1904 | /* | |
1905 | * The existing init process execs a new init binary. | |
1906 | */ | |
1907 | env = init_buildenv(0); | |
1908 | execle(myname, myname, "--init", NULL, env); | |
1909 | ||
1910 | /* | |
1911 | * We shouldn't be here, something failed. | |
1912 | * Bitch, close the state pipe, unblock signals and return. | |
1913 | */ | |
1914 | close(fd); | |
1915 | close(STATE_PIPE); | |
1916 | sigprocmask(SIG_SETMASK, &oldset, NULL); | |
1917 | init_freeenv(env); | |
1918 | initlog(L_CO, "Attempt to re-exec failed"); | |
1919 | } | |
1920 | ||
1921 | ||
1922 | /* | |
1923 | * We got a change runlevel request through the | |
1924 | * init.fifo. Process it. | |
1925 | */ | |
1926 | void fifo_new_level(int level) | |
1927 | { | |
1928 | #if CHANGE_WAIT | |
1929 | CHILD *ch; | |
1930 | #endif | |
1931 | int oldlevel; | |
1932 | ||
1933 | if (level == runlevel) return; | |
1934 | ||
1935 | #if CHANGE_WAIT | |
1936 | /* Are we waiting for a child? */ | |
1937 | for(ch = family; ch; ch = ch->next) | |
1938 | if (ch->flags & WAITING) break; | |
1939 | if (ch == NULL) | |
1940 | #endif | |
1941 | { | |
1942 | /* We need to go into a new runlevel */ | |
1943 | oldlevel = runlevel; | |
1944 | runlevel = read_level(level); | |
1945 | if (runlevel == 'U') { | |
1946 | runlevel = oldlevel; | |
1947 | re_exec(); | |
1948 | } else { | |
1949 | if (oldlevel != 'S' && runlevel == 'S') console_stty(); | |
1950 | if (runlevel == '6' || runlevel == '0' || | |
1951 | runlevel == '1') console_stty(); | |
1952 | read_inittab(); | |
1953 | fail_cancel(); | |
1954 | setproctitle("init [%c]", runlevel); | |
1955 | } | |
1956 | } | |
1957 | } | |
1958 | ||
1959 | ||
1960 | /* | |
1961 | * Set/unset environment variables. The variables are | |
1962 | * encoded as KEY=VAL\0KEY=VAL\0\0. With "=VAL" it means | |
1963 | * setenv, without it means unsetenv. | |
1964 | */ | |
1965 | void initcmd_setenv(char *data, int size) | |
1966 | { | |
1967 | char *env, *p, *e, *eq; | |
1968 | int i, sz; | |
1969 | ||
1970 | e = data + size; | |
1971 | ||
1972 | while (*data && data < e) { | |
1973 | eq = NULL; | |
1974 | for (p = data; *p && p < e; p++) | |
1975 | if (*p == '=') eq = p; | |
1976 | if (*p) break; | |
1977 | env = data; | |
1978 | data = ++p; | |
1979 | ||
1980 | sz = eq ? (eq - env) : (p - env); | |
1981 | ||
1982 | /*initlog(L_SY, "init_setenv: %s, %s, %d", env, eq, sz);*/ | |
1983 | ||
1984 | /* | |
1985 | * We only allow INIT_* to be set. | |
1986 | */ | |
1987 | if (strncmp(env, "INIT_", 5) != 0) | |
1988 | continue; | |
1989 | ||
1990 | /* Free existing vars. */ | |
1991 | for (i = 0; i < NR_EXTRA_ENV; i++) { | |
1992 | if (extra_env[i] == NULL) continue; | |
1993 | if (!strncmp(extra_env[i], env, sz) && | |
1994 | extra_env[i][sz] == '=') { | |
1995 | free(extra_env[i]); | |
1996 | extra_env[i] = NULL; | |
1997 | } | |
1998 | } | |
1999 | ||
2000 | /* Set new vars if needed. */ | |
2001 | if (eq == NULL) continue; | |
2002 | for (i = 0; i < NR_EXTRA_ENV; i++) { | |
2003 | if (extra_env[i] == NULL) { | |
2004 | extra_env[i] = istrdup(env); | |
2005 | break; | |
2006 | } | |
2007 | } | |
2008 | } | |
2009 | } | |
2010 | ||
2011 | ||
2012 | /* | |
2013 | * Read from the init FIFO. Processes like telnetd and rlogind can | |
2014 | * ask us to create login processes on their behalf. | |
2015 | * | |
2016 | * FIXME: this needs to be finished. NOT that it is buggy, but we need | |
2017 | * to add the telnetd/rlogind stuff so people can start using it. | |
2018 | * Maybe move to using an AF_UNIX socket so we can use | |
2019 | * the 2.2 kernel credential stuff to see who we're talking to. | |
2020 | * | |
2021 | */ | |
2022 | void check_init_fifo(void) | |
2023 | { | |
2024 | struct init_request request; | |
2025 | struct timeval tv; | |
2026 | struct stat st, st2; | |
2027 | fd_set fds; | |
2028 | int n; | |
2029 | int quit = 0; | |
2030 | ||
2031 | /* | |
2032 | * First, try to create /dev/initctl if not present. | |
2033 | */ | |
2034 | if (stat(INIT_FIFO, &st2) < 0 && errno == ENOENT) | |
2035 | (void)mkfifo(INIT_FIFO, 0600); | |
2036 | ||
2037 | /* | |
2038 | * If /dev/initctl is open, stat the file to see if it | |
2039 | * is still the _same_ inode. | |
2040 | */ | |
2041 | if (pipe_fd >= 0) { | |
2042 | fstat(pipe_fd, &st); | |
2043 | if (stat(INIT_FIFO, &st2) < 0 || | |
2044 | st.st_dev != st2.st_dev || | |
2045 | st.st_ino != st2.st_ino) { | |
2046 | close(pipe_fd); | |
2047 | pipe_fd = -1; | |
2048 | } | |
2049 | } | |
2050 | ||
2051 | /* | |
2052 | * Now finally try to open /dev/initctl | |
2053 | */ | |
2054 | if (pipe_fd < 0) { | |
2055 | if ((pipe_fd = open(INIT_FIFO, O_RDWR|O_NONBLOCK)) >= 0) { | |
2056 | fstat(pipe_fd, &st); | |
2057 | if (!S_ISFIFO(st.st_mode)) { | |
2058 | initlog(L_VB, "%s is not a fifo", INIT_FIFO); | |
2059 | close(pipe_fd); | |
2060 | pipe_fd = -1; | |
2061 | } | |
2062 | } | |
2063 | if (pipe_fd >= 0) { | |
2064 | /* | |
2065 | * Don't use fd's 0, 1 or 2. | |
2066 | */ | |
2067 | (void) dup2(pipe_fd, PIPE_FD); | |
2068 | close(pipe_fd); | |
2069 | pipe_fd = PIPE_FD; | |
2070 | ||
2071 | /* | |
2072 | * Return to caller - we'll be back later. | |
2073 | */ | |
2074 | } | |
2075 | } | |
2076 | ||
2077 | /* Wait for data to appear, _if_ the pipe was opened. */ | |
2078 | if (pipe_fd >= 0) while(!quit) { | |
2079 | ||
2080 | /* Do select, return on EINTR. */ | |
2081 | FD_ZERO(&fds); | |
2082 | FD_SET(pipe_fd, &fds); | |
2083 | tv.tv_sec = 5; | |
2084 | tv.tv_usec = 0; | |
2085 | n = select(pipe_fd + 1, &fds, NULL, NULL, &tv); | |
2086 | if (n <= 0) { | |
2087 | if (n == 0 || errno == EINTR) return; | |
2088 | continue; | |
2089 | } | |
2090 | ||
2091 | /* Read the data, return on EINTR. */ | |
2092 | n = read(pipe_fd, &request, sizeof(request)); | |
2093 | if (n == 0) { | |
2094 | /* | |
2095 | * End of file. This can't happen under Linux (because | |
2096 | * the pipe is opened O_RDWR - see select() in the | |
2097 | * kernel) but you never know... | |
2098 | */ | |
2099 | close(pipe_fd); | |
2100 | pipe_fd = -1; | |
2101 | return; | |
2102 | } | |
2103 | if (n <= 0) { | |
2104 | if (errno == EINTR) return; | |
2105 | initlog(L_VB, "error reading initrequest"); | |
2106 | continue; | |
2107 | } | |
2108 | ||
2109 | /* | |
2110 | * This is a convenient point to also try to | |
2111 | * find the console device or check if it changed. | |
2112 | */ | |
2113 | console_init(); | |
2114 | ||
2115 | /* | |
2116 | * Process request. | |
2117 | */ | |
2118 | if (request.magic != INIT_MAGIC || n != sizeof(request)) { | |
2119 | initlog(L_VB, "got bogus initrequest"); | |
2120 | continue; | |
2121 | } | |
2122 | switch(request.cmd) { | |
2123 | case INIT_CMD_RUNLVL: | |
2124 | sltime = request.sleeptime; | |
2125 | fifo_new_level(request.runlevel); | |
2126 | quit = 1; | |
2127 | break; | |
2128 | case INIT_CMD_POWERFAIL: | |
2129 | sltime = request.sleeptime; | |
2130 | do_power_fail('F'); | |
2131 | quit = 1; | |
2132 | break; | |
2133 | case INIT_CMD_POWERFAILNOW: | |
2134 | sltime = request.sleeptime; | |
2135 | do_power_fail('L'); | |
2136 | quit = 1; | |
2137 | break; | |
2138 | case INIT_CMD_POWEROK: | |
2139 | sltime = request.sleeptime; | |
2140 | do_power_fail('O'); | |
2141 | quit = 1; | |
2142 | break; | |
2143 | case INIT_CMD_SETENV: | |
2144 | initcmd_setenv(request.i.data, sizeof(request.i.data)); | |
2145 | break; | |
2146 | default: | |
2147 | initlog(L_VB, "got unimplemented initrequest."); | |
2148 | break; | |
2149 | } | |
2150 | } | |
2151 | ||
2152 | /* | |
2153 | * We come here if the pipe couldn't be opened. | |
2154 | */ | |
2155 | if (pipe_fd < 0) pause(); | |
2156 | ||
2157 | } | |
2158 | ||
2159 | ||
2160 | /* | |
2161 | * This function is used in the transition | |
2162 | * sysinit (-> single user) boot -> multi-user. | |
2163 | */ | |
2164 | void boot_transitions() | |
2165 | { | |
2166 | CHILD *ch; | |
2167 | static int newlevel = 0; | |
2168 | static int warn = 1; | |
2169 | int loglevel; | |
2170 | int oldlevel; | |
2171 | ||
2172 | /* Check if there is something to wait for! */ | |
2173 | for( ch = family; ch; ch = ch->next ) | |
2174 | if ((ch->flags & RUNNING) && ch->action != BOOT) break; | |
2175 | ||
2176 | if (ch == NULL) { | |
2177 | /* No processes left in this level, proceed to next level. */ | |
2178 | loglevel = -1; | |
2179 | oldlevel = 'N'; | |
2180 | switch(runlevel) { | |
2181 | case '#': /* SYSINIT -> BOOT */ | |
2182 | INITDBG(L_VB, "SYSINIT -> BOOT"); | |
2183 | ||
2184 | /* Write a boot record. */ | |
2185 | wrote_utmp_reboot = 0; | |
2186 | wrote_wtmp_reboot = 0; | |
2187 | write_utmp_wtmp("reboot", "~~", 0, BOOT_TIME, "~"); | |
2188 | ||
2189 | /* Get our run level */ | |
2190 | newlevel = dfl_level ? dfl_level : get_init_default(); | |
2191 | if (newlevel == 'S') { | |
2192 | runlevel = newlevel; | |
2193 | /* Not really 'S' but show anyway. */ | |
2194 | setproctitle("init [S]"); | |
2195 | } else | |
2196 | runlevel = '*'; | |
2197 | break; | |
2198 | case '*': /* BOOT -> NORMAL */ | |
2199 | INITDBG(L_VB, "BOOT -> NORMAL"); | |
2200 | if (runlevel != newlevel) | |
2201 | loglevel = newlevel; | |
2202 | runlevel = newlevel; | |
2203 | did_boot = 1; | |
2204 | warn = 1; | |
2205 | break; | |
2206 | case 'S': /* Ended SU mode */ | |
2207 | case 's': | |
2208 | INITDBG(L_VB, "END SU MODE"); | |
2209 | newlevel = get_init_default(); | |
2210 | if (!did_boot && newlevel != 'S') | |
2211 | runlevel = '*'; | |
2212 | else { | |
2213 | if (runlevel != newlevel) | |
2214 | loglevel = newlevel; | |
2215 | runlevel = newlevel; | |
2216 | oldlevel = 'S'; | |
2217 | } | |
2218 | warn = 1; | |
2219 | for(ch = family; ch; ch = ch->next) | |
2220 | if (strcmp(ch->rlevel, "S") == 0) | |
2221 | ch->flags &= ~(FAILING|WAITING|XECUTED); | |
2222 | break; | |
2223 | default: | |
2224 | if (warn) | |
2225 | initlog(L_VB, | |
2226 | "no more processes left in this runlevel"); | |
2227 | warn = 0; | |
2228 | loglevel = -1; | |
2229 | if (got_signals == 0) | |
2230 | check_init_fifo(); | |
2231 | break; | |
2232 | } | |
2233 | if (loglevel > 0) { | |
2234 | initlog(L_VB, "Entering runlevel: %c", runlevel); | |
2235 | write_utmp_wtmp("runlevel", "~~", runlevel + 256 * oldlevel, RUN_LVL, "~"); | |
2236 | thislevel = runlevel; | |
2237 | prevlevel = oldlevel; | |
2238 | setproctitle("init [%c]", runlevel); | |
2239 | } | |
2240 | } | |
2241 | } | |
2242 | ||
2243 | /* | |
2244 | * Init got hit by a signal. See which signal it is, | |
2245 | * and act accordingly. | |
2246 | */ | |
2247 | void process_signals() | |
2248 | { | |
2249 | CHILD *ch; | |
2250 | int pwrstat; | |
2251 | int oldlevel; | |
2252 | int fd; | |
2253 | char c; | |
2254 | ||
2255 | if (ISMEMBER(got_signals, SIGPWR)) { | |
2256 | INITDBG(L_VB, "got SIGPWR"); | |
2257 | /* See _what_ kind of SIGPWR this is. */ | |
2258 | pwrstat = 0; | |
2259 | if ((fd = open(PWRSTAT, O_RDONLY)) >= 0) { | |
2260 | c = 0; | |
2261 | read(fd, &c, 1); | |
2262 | pwrstat = c; | |
2263 | close(fd); | |
2264 | unlink(PWRSTAT); | |
2265 | } | |
2266 | do_power_fail(pwrstat); | |
2267 | DELSET(got_signals, SIGPWR); | |
2268 | } | |
2269 | ||
2270 | if (ISMEMBER(got_signals, SIGINT)) { | |
2271 | INITDBG(L_VB, "got SIGINT"); | |
2272 | /* Tell ctrlaltdel entry to start up */ | |
2273 | for(ch = family; ch; ch = ch->next) | |
2274 | if (ch->action == CTRLALTDEL) | |
2275 | ch->flags &= ~XECUTED; | |
2276 | DELSET(got_signals, SIGINT); | |
2277 | } | |
2278 | ||
2279 | if (ISMEMBER(got_signals, SIGWINCH)) { | |
2280 | INITDBG(L_VB, "got SIGWINCH"); | |
2281 | /* Tell kbrequest entry to start up */ | |
2282 | for(ch = family; ch; ch = ch->next) | |
2283 | if (ch->action == KBREQUEST) | |
2284 | ch->flags &= ~XECUTED; | |
2285 | DELSET(got_signals, SIGWINCH); | |
2286 | } | |
2287 | ||
2288 | if (ISMEMBER(got_signals, SIGALRM)) { | |
2289 | INITDBG(L_VB, "got SIGALRM"); | |
2290 | /* The timer went off: check it out */ | |
2291 | DELSET(got_signals, SIGALRM); | |
2292 | } | |
2293 | ||
2294 | if (ISMEMBER(got_signals, SIGCHLD)) { | |
2295 | INITDBG(L_VB, "got SIGCHLD"); | |
2296 | /* First set flag to 0 */ | |
2297 | DELSET(got_signals, SIGCHLD); | |
2298 | ||
2299 | /* See which child this was */ | |
2300 | for(ch = family; ch; ch = ch->next) | |
2301 | if (ch->flags & ZOMBIE) { | |
2302 | INITDBG(L_VB, "Child died, PID= %d", ch->pid); | |
2303 | ch->flags &= ~(RUNNING|ZOMBIE|WAITING); | |
2304 | if (ch->process[0] != '+') | |
2305 | write_utmp_wtmp("", ch->id, ch->pid, DEAD_PROCESS, NULL); | |
2306 | } | |
2307 | ||
2308 | } | |
2309 | ||
2310 | if (ISMEMBER(got_signals, SIGHUP)) { | |
2311 | INITDBG(L_VB, "got SIGHUP"); | |
2312 | #if CHANGE_WAIT | |
2313 | /* Are we waiting for a child? */ | |
2314 | for(ch = family; ch; ch = ch->next) | |
2315 | if (ch->flags & WAITING) break; | |
2316 | if (ch == NULL) | |
2317 | #endif | |
2318 | { | |
2319 | /* We need to go into a new runlevel */ | |
2320 | oldlevel = runlevel; | |
2321 | #ifdef INITLVL | |
2322 | runlevel = read_level(0); | |
2323 | #endif | |
2324 | if (runlevel == 'U') { | |
2325 | runlevel = oldlevel; | |
2326 | re_exec(); | |
2327 | } else { | |
2328 | if (oldlevel != 'S' && runlevel == 'S') console_stty(); | |
2329 | if (runlevel == '6' || runlevel == '0' || | |
2330 | runlevel == '1') console_stty(); | |
2331 | read_inittab(); | |
2332 | fail_cancel(); | |
2333 | setproctitle("init [%c]", runlevel); | |
2334 | DELSET(got_signals, SIGHUP); | |
2335 | } | |
2336 | } | |
2337 | } | |
2338 | if (ISMEMBER(got_signals, SIGUSR1)) { | |
2339 | /* | |
2340 | * SIGUSR1 means close and reopen /dev/initctl | |
2341 | */ | |
2342 | INITDBG(L_VB, "got SIGUSR1"); | |
2343 | close(pipe_fd); | |
2344 | pipe_fd = -1; | |
2345 | DELSET(got_signals, SIGUSR1); | |
2346 | } | |
2347 | } | |
2348 | ||
2349 | /* | |
2350 | * The main loop | |
2351 | */ | |
2352 | int init_main() | |
2353 | { | |
2354 | CHILD *ch; | |
2355 | struct sigaction sa; | |
2356 | sigset_t sgt; | |
2357 | pid_t rc; | |
2358 | int f, st; | |
2359 | ||
2360 | if (!reload) { | |
2361 | ||
2362 | #if INITDEBUG | |
2363 | /* | |
2364 | * Fork so we can debug the init process. | |
2365 | */ | |
2366 | if ((f = fork()) > 0) { | |
2367 | static const char killmsg[] = "PRNT: init killed.\r\n"; | |
2368 | pid_t rc; | |
2369 | ||
2370 | while((rc = wait(&st)) != f) | |
2371 | if (rc < 0 && errno == ECHILD) | |
2372 | break; | |
2373 | write(1, killmsg, sizeof(killmsg) - 1); | |
2374 | while(1) pause(); | |
2375 | } | |
2376 | #endif | |
2377 | ||
2378 | #ifdef __linux__ | |
2379 | /* | |
2380 | * Tell the kernel to send us SIGINT when CTRL-ALT-DEL | |
2381 | * is pressed, and that we want to handle keyboard signals. | |
2382 | */ | |
2383 | init_reboot(BMAGIC_SOFT); | |
2384 | if ((f = open(VT_MASTER, O_RDWR | O_NOCTTY)) >= 0) { | |
2385 | (void) ioctl(f, KDSIGACCEPT, SIGWINCH); | |
2386 | close(f); | |
2387 | } else | |
2388 | (void) ioctl(0, KDSIGACCEPT, SIGWINCH); | |
2389 | #endif | |
2390 | ||
2391 | /* | |
2392 | * Ignore all signals. | |
2393 | */ | |
2394 | for(f = 1; f <= NSIG; f++) | |
2395 | SETSIG(sa, f, SIG_IGN, SA_RESTART); | |
2396 | } | |
2397 | ||
2398 | SETSIG(sa, SIGALRM, signal_handler, 0); | |
2399 | SETSIG(sa, SIGHUP, signal_handler, 0); | |
2400 | SETSIG(sa, SIGINT, signal_handler, 0); | |
2401 | SETSIG(sa, SIGCHLD, chld_handler, SA_RESTART); | |
2402 | SETSIG(sa, SIGPWR, signal_handler, 0); | |
2403 | SETSIG(sa, SIGWINCH, signal_handler, 0); | |
2404 | SETSIG(sa, SIGUSR1, signal_handler, 0); | |
2405 | SETSIG(sa, SIGSTOP, stop_handler, SA_RESTART); | |
2406 | SETSIG(sa, SIGTSTP, stop_handler, SA_RESTART); | |
2407 | SETSIG(sa, SIGCONT, cont_handler, SA_RESTART); | |
2408 | SETSIG(sa, SIGSEGV, (void (*)(int))segv_handler, SA_RESTART); | |
2409 | ||
2410 | console_init(); | |
2411 | ||
2412 | if (!reload) { | |
2413 | ||
2414 | /* Close whatever files are open, and reset the console. */ | |
2415 | close(0); | |
2416 | close(1); | |
2417 | close(2); | |
2418 | console_stty(); | |
2419 | setsid(); | |
2420 | ||
2421 | /* | |
2422 | * Set default PATH variable. | |
2423 | */ | |
2424 | setenv("PATH", PATH_DEFAULT, 1 /* Overwrite */); | |
2425 | ||
2426 | /* | |
2427 | * Initialize /var/run/utmp (only works if /var is on | |
2428 | * root and mounted rw) | |
2429 | */ | |
2430 | (void) close(open(UTMP_FILE, O_WRONLY|O_CREAT|O_TRUNC, 0644)); | |
2431 | ||
2432 | /* | |
2433 | * Say hello to the world | |
2434 | */ | |
2435 | initlog(L_CO, bootmsg, "booting"); | |
2436 | ||
2437 | /* | |
2438 | * See if we have to start an emergency shell. | |
2439 | */ | |
2440 | if (emerg_shell) { | |
2441 | SETSIG(sa, SIGCHLD, SIG_DFL, SA_RESTART); | |
2442 | if (spawn(&ch_emerg, &f) > 0) { | |
2443 | while((rc = wait(&st)) != f) | |
2444 | if (rc < 0 && errno == ECHILD) | |
2445 | break; | |
2446 | } | |
2447 | SETSIG(sa, SIGCHLD, chld_handler, SA_RESTART); | |
2448 | } | |
2449 | ||
2450 | /* | |
2451 | * Start normal boot procedure. | |
2452 | */ | |
2453 | runlevel = '#'; | |
2454 | read_inittab(); | |
2455 | ||
2456 | } else { | |
2457 | /* | |
2458 | * Restart: unblock signals and let the show go on | |
2459 | */ | |
2460 | initlog(L_CO, bootmsg, "reloading"); | |
2461 | sigfillset(&sgt); | |
2462 | sigprocmask(SIG_UNBLOCK, &sgt, NULL); | |
2463 | ||
2464 | /* | |
2465 | * Set default PATH variable. | |
2466 | */ | |
2467 | setenv("PATH", PATH_DEFAULT, 0 /* Don't overwrite */); | |
2468 | } | |
2469 | start_if_needed(); | |
2470 | ||
2471 | while(1) { | |
2472 | ||
2473 | /* See if we need to make the boot transitions. */ | |
2474 | boot_transitions(); | |
2475 | INITDBG(L_VB, "init_main: waiting.."); | |
2476 | ||
2477 | /* Check if there are processes to be waited on. */ | |
2478 | for(ch = family; ch; ch = ch->next) | |
2479 | if ((ch->flags & RUNNING) && ch->action != BOOT) break; | |
2480 | ||
2481 | #if CHANGE_WAIT | |
2482 | /* Wait until we get hit by some signal. */ | |
2483 | while (ch != NULL && got_signals == 0) { | |
2484 | if (ISMEMBER(got_signals, SIGHUP)) { | |
2485 | /* See if there are processes to be waited on. */ | |
2486 | for(ch = family; ch; ch = ch->next) | |
2487 | if (ch->flags & WAITING) break; | |
2488 | } | |
2489 | if (ch != NULL) check_init_fifo(); | |
2490 | } | |
2491 | #else /* CHANGE_WAIT */ | |
2492 | if (ch != NULL && got_signals == 0) check_init_fifo(); | |
2493 | #endif /* CHANGE_WAIT */ | |
2494 | ||
2495 | /* Check the 'failing' flags */ | |
2496 | fail_check(); | |
2497 | ||
2498 | /* Process any signals. */ | |
2499 | process_signals(); | |
2500 | ||
2501 | /* See what we need to start up (again) */ | |
2502 | start_if_needed(); | |
2503 | } | |
2504 | /*NOTREACHED*/ | |
2505 | } | |
2506 | ||
2507 | /* | |
2508 | * Tell the user about the syntax we expect. | |
2509 | */ | |
2510 | void usage(char *s) | |
2511 | { | |
2512 | fprintf(stderr, "Usage: %s {-e VAR[=VAL] | [-t SECONDS] {0|1|2|3|4|5|6|S|s|Q|q|A|a|B|b|C|c|U|u}}\n", s); | |
2513 | exit(1); | |
2514 | } | |
2515 | ||
2516 | int telinit(char *progname, int argc, char **argv) | |
2517 | { | |
2518 | #ifdef TELINIT_USES_INITLVL | |
2519 | FILE *fp; | |
2520 | #endif | |
2521 | struct init_request request; | |
2522 | struct sigaction sa; | |
2523 | int f, fd, l; | |
2524 | char *env = NULL; | |
2525 | ||
2526 | memset(&request, 0, sizeof(request)); | |
2527 | request.magic = INIT_MAGIC; | |
2528 | ||
2529 | while ((f = getopt(argc, argv, "t:e:")) != EOF) switch(f) { | |
2530 | case 't': | |
2531 | sltime = atoi(optarg); | |
2532 | break; | |
2533 | case 'e': | |
2534 | if (env == NULL) | |
2535 | env = request.i.data; | |
2536 | l = strlen(optarg); | |
2537 | if (env + l + 2 > request.i.data + sizeof(request.i.data)) { | |
2538 | fprintf(stderr, "%s: -e option data " | |
2539 | "too large\n", progname); | |
2540 | exit(1); | |
2541 | } | |
2542 | memcpy(env, optarg, l); | |
2543 | env += l; | |
2544 | *env++ = 0; | |
2545 | break; | |
2546 | default: | |
2547 | usage(progname); | |
2548 | break; | |
2549 | } | |
2550 | ||
2551 | if (env) *env++ = 0; | |
2552 | ||
2553 | if (env) { | |
2554 | if (argc != optind) | |
2555 | usage(progname); | |
2556 | request.cmd = INIT_CMD_SETENV; | |
2557 | } else { | |
2558 | if (argc - optind != 1 || strlen(argv[optind]) != 1) | |
2559 | usage(progname); | |
2560 | if (!strchr("0123456789SsQqAaBbCcUu", argv[optind][0])) | |
2561 | usage(progname); | |
2562 | request.cmd = INIT_CMD_RUNLVL; | |
2563 | request.runlevel = env ? 0 : argv[optind][0]; | |
2564 | request.sleeptime = sltime; | |
2565 | } | |
2566 | ||
2567 | /* Open the fifo and write a command. */ | |
2568 | /* Make sure we don't hang on opening /dev/initctl */ | |
2569 | SETSIG(sa, SIGALRM, signal_handler, 0); | |
2570 | alarm(3); | |
2571 | if ((fd = open(INIT_FIFO, O_WRONLY)) >= 0 && | |
2572 | write(fd, &request, sizeof(request)) == sizeof(request)) { | |
2573 | close(fd); | |
2574 | alarm(0); | |
2575 | return 0; | |
2576 | } | |
2577 | ||
2578 | #ifdef TELINIT_USES_INITLVL | |
2579 | if (request.cmd == INIT_CMD_RUNLVL) { | |
2580 | /* Fallthrough to the old method. */ | |
2581 | ||
2582 | /* Now write the new runlevel. */ | |
2583 | if ((fp = fopen(INITLVL, "w")) == NULL) { | |
2584 | fprintf(stderr, "%s: cannot create %s\n", | |
2585 | progname, INITLVL); | |
2586 | exit(1); | |
2587 | } | |
2588 | fprintf(fp, "%s %d", argv[optind], sltime); | |
2589 | fclose(fp); | |
2590 | ||
2591 | /* And tell init about the pending runlevel change. */ | |
2592 | if (kill(INITPID, SIGHUP) < 0) perror(progname); | |
2593 | ||
2594 | return 0; | |
2595 | } | |
2596 | #endif | |
2597 | ||
2598 | fprintf(stderr, "%s: ", progname); | |
2599 | if (ISMEMBER(got_signals, SIGALRM)) { | |
2600 | fprintf(stderr, "timeout opening/writing control channel %s\n", | |
2601 | INIT_FIFO); | |
2602 | } else { | |
2603 | perror(INIT_FIFO); | |
2604 | } | |
2605 | return 1; | |
2606 | } | |
2607 | ||
2608 | /* | |
2609 | * Main entry for init and telinit. | |
2610 | */ | |
2611 | int main(int argc, char **argv) | |
2612 | { | |
2613 | char *p; | |
2614 | int f; | |
2615 | int isinit; | |
2616 | int enforce = 0; | |
2617 | ||
2618 | /* Get my own name */ | |
2619 | if ((p = strrchr(argv[0], '/')) != NULL) | |
2620 | p++; | |
2621 | else | |
2622 | p = argv[0]; | |
2623 | umask(022); | |
2624 | ||
2625 | /* Quick check */ | |
2626 | if (geteuid() != 0) { | |
2627 | fprintf(stderr, "%s: must be superuser.\n", p); | |
2628 | exit(1); | |
2629 | } | |
2630 | ||
2631 | /* | |
2632 | * Is this telinit or init ? | |
2633 | */ | |
2634 | isinit = (getpid() == 1); | |
2635 | for (f = 1; f < argc; f++) { | |
2636 | if (!strcmp(argv[f], "-i") || !strcmp(argv[f], "--init")) { | |
2637 | isinit = 1; | |
2638 | break; | |
2639 | } | |
2640 | } | |
2641 | if (!isinit) exit(telinit(p, argc, argv)); | |
2642 | ||
2643 | /* | |
2644 | * Check for re-exec | |
2645 | */ | |
2646 | if (check_pipe(STATE_PIPE)) { | |
2647 | ||
2648 | receive_state(STATE_PIPE); | |
2649 | ||
2650 | myname = istrdup(argv[0]); | |
2651 | argv0 = argv[0]; | |
2652 | maxproclen = 0; | |
2653 | for (f = 0; f < argc; f++) | |
2654 | maxproclen += strlen(argv[f]) + 1; | |
2655 | reload = 1; | |
2656 | setproctitle("init [%c]",runlevel); | |
2657 | ||
2658 | init_main(); | |
2659 | } | |
2660 | ||
2661 | /* Check command line arguments */ | |
2662 | maxproclen = strlen(argv[0]) + 1; | |
2663 | for(f = 1; f < argc; f++) { | |
2664 | if (!strcmp(argv[f], "single") || !strcmp(argv[f], "-s")) | |
2665 | dfl_level = 'S'; | |
2666 | else if (!strcmp(argv[f], "-a") || !strcmp(argv[f], "auto")) | |
2667 | putenv("AUTOBOOT=YES"); | |
2668 | else if (!strcmp(argv[f], "-b") || !strcmp(argv[f],"emergency")) | |
2669 | emerg_shell = 1; | |
2670 | else if (!strcmp(argv[f], "-z")) { | |
2671 | /* Ignore -z xxx */ | |
2672 | if (argv[f + 1]) f++; | |
2673 | } else if (strchr("0123456789sS", argv[f][0]) | |
2674 | && strlen(argv[f]) == 1) | |
2675 | dfl_level = argv[f][0]; | |
2676 | /* "init u" in the very beginning makes no sense */ | |
2677 | if (dfl_level == 's') dfl_level = 'S'; | |
2678 | maxproclen += strlen(argv[f]) + 1; | |
2679 | } | |
2680 | ||
2681 | #ifdef WITH_SELINUX | |
2682 | if (getenv("SELINUX_INIT") == NULL && !is_selinux_enabled()) { | |
2683 | putenv("SELINUX_INIT=YES"); | |
2684 | if (selinux_init_load_policy(&enforce) == 0 ) { | |
2685 | execv(myname, argv); | |
2686 | } else { | |
2687 | if (enforce > 0) { | |
2688 | /* SELinux in enforcing mode but load_policy failed */ | |
2689 | /* At this point, we probably can't open /dev/console, so log() won't work */ | |
2690 | fprintf(stderr,"Unable to load SELinux Policy. Machine is in enforcing mode. Halting now.\n"); | |
2691 | exit(1); | |
2692 | } | |
2693 | } | |
2694 | } | |
2695 | #endif | |
2696 | /* Start booting. */ | |
2697 | argv0 = argv[0]; | |
2698 | argv[1] = NULL; | |
2699 | setproctitle("init boot"); | |
2700 | init_main(dfl_level); | |
2701 | ||
2702 | /*NOTREACHED*/ | |
2703 | return 0; | |
2704 | } |