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1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
2
3 /***
4 This file is part of systemd.
5
6 Copyright 2010 Lennart Poettering
7
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
20 ***/
21
22 #include <dbus/dbus.h>
23
24 #include <stdio.h>
25 #include <errno.h>
26 #include <string.h>
27 #include <unistd.h>
28 #include <sys/types.h>
29 #include <sys/stat.h>
30 #include <getopt.h>
31 #include <signal.h>
32 #include <sys/wait.h>
33 #include <fcntl.h>
34
35 #include "manager.h"
36 #include "log.h"
37 #include "mount-setup.h"
38 #include "hostname-setup.h"
39 #include "loopback-setup.h"
40 #include "kmod-setup.h"
41 #include "locale-setup.h"
42 #include "selinux-setup.h"
43 #include "load-fragment.h"
44 #include "fdset.h"
45 #include "special.h"
46 #include "conf-parser.h"
47 #include "bus-errors.h"
48 #include "missing.h"
49 #include "label.h"
50 #include "build.h"
51
52 static enum {
53 ACTION_RUN,
54 ACTION_HELP,
55 ACTION_TEST,
56 ACTION_DUMP_CONFIGURATION_ITEMS,
57 ACTION_DONE
58 } arg_action = ACTION_RUN;
59
60 static char *arg_default_unit = NULL;
61 static ManagerRunningAs arg_running_as = _MANAGER_RUNNING_AS_INVALID;
62
63 static bool arg_dump_core = true;
64 static bool arg_crash_shell = false;
65 static int arg_crash_chvt = -1;
66 static bool arg_confirm_spawn = false;
67 static bool arg_show_status = true;
68 #ifdef HAVE_SYSV_COMPAT
69 static bool arg_sysv_console = true;
70 #endif
71 static bool arg_mount_auto = true;
72 static bool arg_swap_auto = true;
73 static char *arg_console = NULL;
74
75 static FILE* serialization = NULL;
76
77 static void nop_handler(int sig) {
78 }
79
80 _noreturn_ static void crash(int sig) {
81
82 if (!arg_dump_core)
83 log_error("Caught <%s>, not dumping core.", signal_to_string(sig));
84 else {
85 struct sigaction sa;
86 pid_t pid;
87
88 /* We want to wait for the core process, hence let's enable SIGCHLD */
89 zero(sa);
90 sa.sa_handler = nop_handler;
91 sa.sa_flags = SA_NOCLDSTOP|SA_RESTART;
92 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
93
94 if ((pid = fork()) < 0)
95 log_error("Caught <%s>, cannot fork for core dump: %s", signal_to_string(sig), strerror(errno));
96
97 else if (pid == 0) {
98 struct rlimit rl;
99
100 /* Enable default signal handler for core dump */
101 zero(sa);
102 sa.sa_handler = SIG_DFL;
103 assert_se(sigaction(sig, &sa, NULL) == 0);
104
105 /* Don't limit the core dump size */
106 zero(rl);
107 rl.rlim_cur = RLIM_INFINITY;
108 rl.rlim_max = RLIM_INFINITY;
109 setrlimit(RLIMIT_CORE, &rl);
110
111 /* Just to be sure... */
112 assert_se(chdir("/") == 0);
113
114 /* Raise the signal again */
115 raise(sig);
116
117 assert_not_reached("We shouldn't be here...");
118 _exit(1);
119
120 } else {
121 siginfo_t status;
122 int r;
123
124 /* Order things nicely. */
125 if ((r = wait_for_terminate(pid, &status)) < 0)
126 log_error("Caught <%s>, waitpid() failed: %s", signal_to_string(sig), strerror(-r));
127 else if (status.si_code != CLD_DUMPED)
128 log_error("Caught <%s>, core dump failed.", signal_to_string(sig));
129 else
130 log_error("Caught <%s>, dumped core as pid %lu.", signal_to_string(sig), (unsigned long) pid);
131 }
132 }
133
134 if (arg_crash_chvt)
135 chvt(arg_crash_chvt);
136
137 if (arg_crash_shell) {
138 struct sigaction sa;
139 pid_t pid;
140
141 log_info("Executing crash shell in 10s...");
142 sleep(10);
143
144 /* Let the kernel reap children for us */
145 zero(sa);
146 sa.sa_handler = SIG_IGN;
147 sa.sa_flags = SA_NOCLDSTOP|SA_NOCLDWAIT|SA_RESTART;
148 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
149
150 if ((pid = fork()) < 0)
151 log_error("Failed to fork off crash shell: %s", strerror(errno));
152 else if (pid == 0) {
153 int fd, r;
154
155 if ((fd = acquire_terminal("/dev/console", false, true, true)) < 0)
156 log_error("Failed to acquire terminal: %s", strerror(-fd));
157 else if ((r = make_stdio(fd)) < 0)
158 log_error("Failed to duplicate terminal fd: %s", strerror(-r));
159
160 execl("/bin/sh", "/bin/sh", NULL);
161
162 log_error("execl() failed: %s", strerror(errno));
163 _exit(1);
164 }
165
166 log_info("Successfully spawned crash shall as pid %lu.", (unsigned long) pid);
167 }
168
169 log_info("Freezing execution.");
170 freeze();
171 }
172
173 static void install_crash_handler(void) {
174 struct sigaction sa;
175
176 zero(sa);
177
178 sa.sa_handler = crash;
179 sa.sa_flags = SA_NODEFER;
180
181 sigaction_many(&sa, SIGNALS_CRASH_HANDLER, -1);
182 }
183
184 static int console_setup(bool do_reset) {
185 int tty_fd, r;
186
187 /* If we are init, we connect stdin/stdout/stderr to /dev/null
188 * and make sure we don't have a controlling tty. */
189
190 release_terminal();
191
192 if (!do_reset)
193 return 0;
194
195 if ((tty_fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC)) < 0) {
196 log_error("Failed to open /dev/console: %s", strerror(-tty_fd));
197 return -tty_fd;
198 }
199
200 if ((r = reset_terminal(tty_fd)) < 0)
201 log_error("Failed to reset /dev/console: %s", strerror(-r));
202
203 close_nointr_nofail(tty_fd);
204 return r;
205 }
206
207 static int set_default_unit(const char *u) {
208 char *c;
209
210 assert(u);
211
212 if (!(c = strdup(u)))
213 return -ENOMEM;
214
215 free(arg_default_unit);
216 arg_default_unit = c;
217 return 0;
218 }
219
220 static int parse_proc_cmdline_word(const char *word) {
221
222 static const char * const rlmap[] = {
223 "emergency", SPECIAL_EMERGENCY_TARGET,
224 "single", SPECIAL_RESCUE_TARGET,
225 "-s", SPECIAL_RESCUE_TARGET,
226 "s", SPECIAL_RESCUE_TARGET,
227 "S", SPECIAL_RESCUE_TARGET,
228 "1", SPECIAL_RESCUE_TARGET,
229 "2", SPECIAL_RUNLEVEL2_TARGET,
230 "3", SPECIAL_RUNLEVEL3_TARGET,
231 "4", SPECIAL_RUNLEVEL4_TARGET,
232 "5", SPECIAL_RUNLEVEL5_TARGET,
233 };
234
235 assert(word);
236
237 if (startswith(word, "systemd.unit="))
238 return set_default_unit(word + 13);
239
240 else if (startswith(word, "systemd.log_target=")) {
241
242 if (log_set_target_from_string(word + 19) < 0)
243 log_warning("Failed to parse log target %s. Ignoring.", word + 19);
244
245 } else if (startswith(word, "systemd.log_level=")) {
246
247 if (log_set_max_level_from_string(word + 18) < 0)
248 log_warning("Failed to parse log level %s. Ignoring.", word + 18);
249
250 } else if (startswith(word, "systemd.log_color=")) {
251
252 if (log_show_color_from_string(word + 18) < 0)
253 log_warning("Failed to parse log color setting %s. Ignoring.", word + 18);
254
255 } else if (startswith(word, "systemd.log_location=")) {
256
257 if (log_show_location_from_string(word + 21) < 0)
258 log_warning("Failed to parse log location setting %s. Ignoring.", word + 21);
259
260 } else if (startswith(word, "systemd.dump_core=")) {
261 int r;
262
263 if ((r = parse_boolean(word + 18)) < 0)
264 log_warning("Failed to parse dump core switch %s, Ignoring.", word + 18);
265 else
266 arg_dump_core = r;
267
268 } else if (startswith(word, "systemd.crash_shell=")) {
269 int r;
270
271 if ((r = parse_boolean(word + 20)) < 0)
272 log_warning("Failed to parse crash shell switch %s, Ignoring.", word + 20);
273 else
274 arg_crash_shell = r;
275
276 } else if (startswith(word, "systemd.confirm_spawn=")) {
277 int r;
278
279 if ((r = parse_boolean(word + 22)) < 0)
280 log_warning("Failed to parse confirm spawn switch %s, Ignoring.", word + 22);
281 else
282 arg_confirm_spawn = r;
283
284 } else if (startswith(word, "systemd.crash_chvt=")) {
285 int k;
286
287 if (safe_atoi(word + 19, &k) < 0)
288 log_warning("Failed to parse crash chvt switch %s, Ignoring.", word + 19);
289 else
290 arg_crash_chvt = k;
291
292 } else if (startswith(word, "systemd.show_status=")) {
293 int r;
294
295 if ((r = parse_boolean(word + 20)) < 0)
296 log_warning("Failed to parse show status switch %s, Ignoring.", word + 20);
297 else
298 arg_show_status = r;
299 #ifdef HAVE_SYSV_COMPAT
300 } else if (startswith(word, "systemd.sysv_console=")) {
301 int r;
302
303 if ((r = parse_boolean(word + 21)) < 0)
304 log_warning("Failed to parse SysV console switch %s, Ignoring.", word + 20);
305 else
306 arg_sysv_console = r;
307 #endif
308
309 } else if (startswith(word, "systemd.")) {
310
311 log_warning("Unknown kernel switch %s. Ignoring.", word);
312
313 log_info("Supported kernel switches:\n"
314 "systemd.unit=UNIT Default unit to start\n"
315 "systemd.dump_core=0|1 Dump core on crash\n"
316 "systemd.crash_shell=0|1 Run shell on crash\n"
317 "systemd.crash_chvt=N Change to VT #N on crash\n"
318 "systemd.confirm_spawn=0|1 Confirm every process spawn\n"
319 "systemd.show_status=0|1 Show status updates on the console during bootup\n"
320 #ifdef HAVE_SYSV_COMPAT
321 "systemd.sysv_console=0|1 Connect output of SysV scripts to console\n"
322 #endif
323 "systemd.log_target=console|kmsg|syslog|syslog-or-kmsg|null\n"
324 " Log target\n"
325 "systemd.log_level=LEVEL Log level\n"
326 "systemd.log_color=0|1 Highlight important log messages\n"
327 "systemd.log_location=0|1 Include code location in log messages\n");
328
329 } else if (startswith(word, "console=")) {
330 const char *k;
331 size_t l;
332 char *w = NULL;
333
334 k = word + 8;
335 l = strcspn(k, ",");
336
337 /* Ignore the console setting if set to a VT */
338 if (l < 4 ||
339 !startswith(k, "tty") ||
340 k[3+strspn(k+3, "0123456789")] != 0) {
341
342 if (!(w = strndup(k, l)))
343 return -ENOMEM;
344 }
345
346 free(arg_console);
347 arg_console = w;
348
349 } else if (streq(word, "quiet")) {
350 arg_show_status = false;
351 #ifdef HAVE_SYSV_COMPAT
352 arg_sysv_console = false;
353 #endif
354 } else {
355 unsigned i;
356
357 /* SysV compatibility */
358 for (i = 0; i < ELEMENTSOF(rlmap); i += 2)
359 if (streq(word, rlmap[i]))
360 return set_default_unit(rlmap[i+1]);
361 }
362
363 return 0;
364 }
365
366 static int config_parse_level(
367 const char *filename,
368 unsigned line,
369 const char *section,
370 const char *lvalue,
371 const char *rvalue,
372 void *data,
373 void *userdata) {
374
375 assert(filename);
376 assert(lvalue);
377 assert(rvalue);
378
379 log_set_max_level_from_string(rvalue);
380 return 0;
381 }
382
383 static int config_parse_target(
384 const char *filename,
385 unsigned line,
386 const char *section,
387 const char *lvalue,
388 const char *rvalue,
389 void *data,
390 void *userdata) {
391
392 assert(filename);
393 assert(lvalue);
394 assert(rvalue);
395
396 log_set_target_from_string(rvalue);
397 return 0;
398 }
399
400 static int config_parse_color(
401 const char *filename,
402 unsigned line,
403 const char *section,
404 const char *lvalue,
405 const char *rvalue,
406 void *data,
407 void *userdata) {
408
409 assert(filename);
410 assert(lvalue);
411 assert(rvalue);
412
413 log_show_color_from_string(rvalue);
414 return 0;
415 }
416
417 static int config_parse_location(
418 const char *filename,
419 unsigned line,
420 const char *section,
421 const char *lvalue,
422 const char *rvalue,
423 void *data,
424 void *userdata) {
425
426 assert(filename);
427 assert(lvalue);
428 assert(rvalue);
429
430 log_show_location_from_string(rvalue);
431 return 0;
432 }
433
434 static int config_parse_cpu_affinity(
435 const char *filename,
436 unsigned line,
437 const char *section,
438 const char *lvalue,
439 const char *rvalue,
440 void *data,
441 void *userdata) {
442
443 char *w;
444 size_t l;
445 char *state;
446 cpu_set_t *c = NULL;
447 unsigned ncpus = 0;
448
449 assert(filename);
450 assert(lvalue);
451 assert(rvalue);
452
453 FOREACH_WORD_QUOTED(w, l, rvalue, state) {
454 char *t;
455 int r;
456 unsigned cpu;
457
458 if (!(t = strndup(w, l)))
459 return -ENOMEM;
460
461 r = safe_atou(t, &cpu);
462 free(t);
463
464 if (!c)
465 if (!(c = cpu_set_malloc(&ncpus)))
466 return -ENOMEM;
467
468 if (r < 0 || cpu >= ncpus) {
469 log_error("[%s:%u] Failed to parse CPU affinity: %s", filename, line, rvalue);
470 CPU_FREE(c);
471 return -EBADMSG;
472 }
473
474 CPU_SET_S(cpu, CPU_ALLOC_SIZE(ncpus), c);
475 }
476
477 if (c) {
478 if (sched_setaffinity(0, CPU_ALLOC_SIZE(ncpus), c) < 0)
479 log_warning("Failed to set CPU affinity: %m");
480
481 CPU_FREE(c);
482 }
483
484 return 0;
485 }
486
487 static int parse_config_file(void) {
488
489 const ConfigItem items[] = {
490 { "LogLevel", config_parse_level, NULL, "Manager" },
491 { "LogTarget", config_parse_target, NULL, "Manager" },
492 { "LogColor", config_parse_color, NULL, "Manager" },
493 { "LogLocation", config_parse_location, NULL, "Manager" },
494 { "DumpCore", config_parse_bool, &arg_dump_core, "Manager" },
495 { "CrashShell", config_parse_bool, &arg_crash_shell, "Manager" },
496 { "ShowStatus", config_parse_bool, &arg_show_status, "Manager" },
497 #ifdef HAVE_SYSV_COMPAT
498 { "SysVConsole", config_parse_bool, &arg_sysv_console, "Manager" },
499 #endif
500 { "CrashChVT", config_parse_int, &arg_crash_chvt, "Manager" },
501 { "CPUAffinity", config_parse_cpu_affinity, NULL, "Manager" },
502 { "MountAuto", config_parse_bool, &arg_mount_auto, "Manager" },
503 { "SwapAuto", config_parse_bool, &arg_swap_auto, "Manager" },
504 { NULL, NULL, NULL, NULL }
505 };
506
507 static const char * const sections[] = {
508 "Manager",
509 NULL
510 };
511
512 FILE *f;
513 const char *fn;
514 int r;
515
516 fn = arg_running_as == MANAGER_SYSTEM ? SYSTEM_CONFIG_FILE : SESSION_CONFIG_FILE;
517
518 if (!(f = fopen(fn, "re"))) {
519 if (errno == ENOENT)
520 return 0;
521
522 log_warning("Failed to open configuration file '%s': %m", fn);
523 return 0;
524 }
525
526 if ((r = config_parse(fn, f, sections, items, false, NULL)) < 0)
527 log_warning("Failed to parse configuration file: %s", strerror(-r));
528
529 fclose(f);
530
531 return 0;
532 }
533
534 static int parse_proc_cmdline(void) {
535 char *line, *w, *state;
536 int r;
537 size_t l;
538
539 if ((r = read_one_line_file("/proc/cmdline", &line)) < 0) {
540 log_warning("Failed to read /proc/cmdline, ignoring: %s", strerror(-r));
541 return 0;
542 }
543
544 FOREACH_WORD_QUOTED(w, l, line, state) {
545 char *word;
546
547 if (!(word = strndup(w, l))) {
548 r = -ENOMEM;
549 goto finish;
550 }
551
552 r = parse_proc_cmdline_word(word);
553 free(word);
554
555 if (r < 0)
556 goto finish;
557 }
558
559 r = 0;
560
561 finish:
562 free(line);
563 return r;
564 }
565
566 static int parse_argv(int argc, char *argv[]) {
567
568 enum {
569 ARG_LOG_LEVEL = 0x100,
570 ARG_LOG_TARGET,
571 ARG_LOG_COLOR,
572 ARG_LOG_LOCATION,
573 ARG_UNIT,
574 ARG_SYSTEM,
575 ARG_SESSION,
576 ARG_TEST,
577 ARG_DUMP_CONFIGURATION_ITEMS,
578 ARG_DUMP_CORE,
579 ARG_CRASH_SHELL,
580 ARG_CONFIRM_SPAWN,
581 ARG_SHOW_STATUS,
582 ARG_SYSV_CONSOLE,
583 ARG_DESERIALIZE,
584 ARG_INTROSPECT
585 };
586
587 static const struct option options[] = {
588 { "log-level", required_argument, NULL, ARG_LOG_LEVEL },
589 { "log-target", required_argument, NULL, ARG_LOG_TARGET },
590 { "log-color", optional_argument, NULL, ARG_LOG_COLOR },
591 { "log-location", optional_argument, NULL, ARG_LOG_LOCATION },
592 { "unit", required_argument, NULL, ARG_UNIT },
593 { "system", no_argument, NULL, ARG_SYSTEM },
594 { "session", no_argument, NULL, ARG_SESSION },
595 { "test", no_argument, NULL, ARG_TEST },
596 { "help", no_argument, NULL, 'h' },
597 { "dump-configuration-items", no_argument, NULL, ARG_DUMP_CONFIGURATION_ITEMS },
598 { "dump-core", no_argument, NULL, ARG_DUMP_CORE },
599 { "crash-shell", no_argument, NULL, ARG_CRASH_SHELL },
600 { "confirm-spawn", no_argument, NULL, ARG_CONFIRM_SPAWN },
601 { "show-status", optional_argument, NULL, ARG_SHOW_STATUS },
602 #ifdef HAVE_SYSV_COMPAT
603 { "sysv-console", optional_argument, NULL, ARG_SYSV_CONSOLE },
604 #endif
605 { "deserialize", required_argument, NULL, ARG_DESERIALIZE },
606 { "introspect", optional_argument, NULL, ARG_INTROSPECT },
607 { NULL, 0, NULL, 0 }
608 };
609
610 int c, r;
611
612 assert(argc >= 1);
613 assert(argv);
614
615 while ((c = getopt_long(argc, argv, "hD", options, NULL)) >= 0)
616
617 switch (c) {
618
619 case ARG_LOG_LEVEL:
620 if ((r = log_set_max_level_from_string(optarg)) < 0) {
621 log_error("Failed to parse log level %s.", optarg);
622 return r;
623 }
624
625 break;
626
627 case ARG_LOG_TARGET:
628
629 if ((r = log_set_target_from_string(optarg)) < 0) {
630 log_error("Failed to parse log target %s.", optarg);
631 return r;
632 }
633
634 break;
635
636 case ARG_LOG_COLOR:
637
638 if (optarg) {
639 if ((r = log_show_color_from_string(optarg)) < 0) {
640 log_error("Failed to parse log color setting %s.", optarg);
641 return r;
642 }
643 } else
644 log_show_color(true);
645
646 break;
647
648 case ARG_LOG_LOCATION:
649
650 if (optarg) {
651 if ((r = log_show_location_from_string(optarg)) < 0) {
652 log_error("Failed to parse log location setting %s.", optarg);
653 return r;
654 }
655 } else
656 log_show_location(true);
657
658 break;
659
660 case ARG_UNIT:
661
662 if ((r = set_default_unit(optarg)) < 0) {
663 log_error("Failed to set default unit %s: %s", optarg, strerror(-r));
664 return r;
665 }
666
667 break;
668
669 case ARG_SYSTEM:
670 arg_running_as = MANAGER_SYSTEM;
671 break;
672
673 case ARG_SESSION:
674 arg_running_as = MANAGER_SESSION;
675 break;
676
677 case ARG_TEST:
678 arg_action = ACTION_TEST;
679 break;
680
681 case ARG_DUMP_CONFIGURATION_ITEMS:
682 arg_action = ACTION_DUMP_CONFIGURATION_ITEMS;
683 break;
684
685 case ARG_DUMP_CORE:
686 arg_dump_core = true;
687 break;
688
689 case ARG_CRASH_SHELL:
690 arg_crash_shell = true;
691 break;
692
693 case ARG_CONFIRM_SPAWN:
694 arg_confirm_spawn = true;
695 break;
696
697 case ARG_SHOW_STATUS:
698
699 if (optarg) {
700 if ((r = parse_boolean(optarg)) < 0) {
701 log_error("Failed to show status boolean %s.", optarg);
702 return r;
703 }
704 arg_show_status = r;
705 } else
706 arg_show_status = true;
707 break;
708 #ifdef HAVE_SYSV_COMPAT
709 case ARG_SYSV_CONSOLE:
710
711 if (optarg) {
712 if ((r = parse_boolean(optarg)) < 0) {
713 log_error("Failed to SysV console boolean %s.", optarg);
714 return r;
715 }
716 arg_sysv_console = r;
717 } else
718 arg_sysv_console = true;
719 break;
720 #endif
721
722 case ARG_DESERIALIZE: {
723 int fd;
724 FILE *f;
725
726 if ((r = safe_atoi(optarg, &fd)) < 0 || fd < 0) {
727 log_error("Failed to parse deserialize option %s.", optarg);
728 return r;
729 }
730
731 if (!(f = fdopen(fd, "r"))) {
732 log_error("Failed to open serialization fd: %m");
733 return r;
734 }
735
736 if (serialization)
737 fclose(serialization);
738
739 serialization = f;
740
741 break;
742 }
743
744 case ARG_INTROSPECT: {
745 const char * const * i = NULL;
746
747 for (i = bus_interface_table; *i; i += 2)
748 if (!optarg || streq(i[0], optarg)) {
749 fputs(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE
750 "<node>\n", stdout);
751 fputs(i[1], stdout);
752 fputs("</node>\n", stdout);
753
754 if (optarg)
755 break;
756 }
757
758 if (!i[0] && optarg)
759 log_error("Unknown interface %s.", optarg);
760
761 arg_action = ACTION_DONE;
762 break;
763 }
764
765 case 'h':
766 arg_action = ACTION_HELP;
767 break;
768
769 case 'D':
770 log_set_max_level(LOG_DEBUG);
771 break;
772
773 case '?':
774 return -EINVAL;
775
776 default:
777 log_error("Unknown option code %c", c);
778 return -EINVAL;
779 }
780
781 /* PID 1 will get the kernel arguments as parameters, which we
782 * ignore and unconditionally read from
783 * /proc/cmdline. However, we need to ignore those arguments
784 * here. */
785 if (arg_running_as != MANAGER_SYSTEM && optind < argc) {
786 log_error("Excess arguments.");
787 return -EINVAL;
788 }
789
790 return 0;
791 }
792
793 static int help(void) {
794
795 printf("%s [OPTIONS...]\n\n"
796 "Starts up and maintains the system or a session.\n\n"
797 " -h --help Show this help\n"
798 " --test Determine startup sequence, dump it and exit\n"
799 " --dump-configuration-items Dump understood unit configuration items\n"
800 " --introspect[=INTERFACE] Extract D-Bus interface data\n"
801 " --unit=UNIT Set default unit\n"
802 " --system Run a system instance, even if PID != 1\n"
803 " --session Run a session instance\n"
804 " --dump-core Dump core on crash\n"
805 " --crash-shell Run shell on crash\n"
806 " --confirm-spawn Ask for confirmation when spawning processes\n"
807 " --show-status[=0|1] Show status updates on the console during bootup\n"
808 #ifdef HAVE_SYSV_COMPAT
809 " --sysv-console[=0|1] Connect output of SysV scripts to console\n"
810 #endif
811 " --log-target=TARGET Set log target (console, syslog, kmsg, syslog-or-kmsg, null)\n"
812 " --log-level=LEVEL Set log level (debug, info, notice, warning, err, crit, alert, emerg)\n"
813 " --log-color[=0|1] Highlight important log messages\n"
814 " --log-location[=0|1] Include code location in log messages\n",
815 program_invocation_short_name);
816
817 return 0;
818 }
819
820 static int prepare_reexecute(Manager *m, FILE **_f, FDSet **_fds) {
821 FILE *f = NULL;
822 FDSet *fds = NULL;
823 int r;
824
825 assert(m);
826 assert(_f);
827 assert(_fds);
828
829 if ((r = manager_open_serialization(m, &f)) < 0) {
830 log_error("Failed to create serialization faile: %s", strerror(-r));
831 goto fail;
832 }
833
834 if (!(fds = fdset_new())) {
835 r = -ENOMEM;
836 log_error("Failed to allocate fd set: %s", strerror(-r));
837 goto fail;
838 }
839
840 if ((r = manager_serialize(m, f, fds)) < 0) {
841 log_error("Failed to serialize state: %s", strerror(-r));
842 goto fail;
843 }
844
845 if (fseeko(f, 0, SEEK_SET) < 0) {
846 log_error("Failed to rewind serialization fd: %m");
847 goto fail;
848 }
849
850 if ((r = fd_cloexec(fileno(f), false)) < 0) {
851 log_error("Failed to disable O_CLOEXEC for serialization: %s", strerror(-r));
852 goto fail;
853 }
854
855 if ((r = fdset_cloexec(fds, false)) < 0) {
856 log_error("Failed to disable O_CLOEXEC for serialization fds: %s", strerror(-r));
857 goto fail;
858 }
859
860 *_f = f;
861 *_fds = fds;
862
863 return 0;
864
865 fail:
866 fdset_free(fds);
867
868 if (f)
869 fclose(f);
870
871 return r;
872 }
873
874 int main(int argc, char *argv[]) {
875 Manager *m = NULL;
876 int r, retval = EXIT_FAILURE;
877 FDSet *fds = NULL;
878 bool reexecute = false;
879 const char *shutdown_verb = NULL;
880
881 if (getpid() != 1 && strstr(program_invocation_short_name, "init")) {
882 /* This is compatbility support for SysV, where
883 * calling init as a user is identical to telinit. */
884
885 errno = -ENOENT;
886 execv(SYSTEMCTL_BINARY_PATH, argv);
887 log_error("Failed to exec " SYSTEMCTL_BINARY_PATH ": %m");
888 return 1;
889 }
890
891 log_show_color(isatty(STDERR_FILENO) > 0);
892 log_show_location(false);
893 log_set_max_level(LOG_INFO);
894
895 if (getpid() == 1) {
896 arg_running_as = MANAGER_SYSTEM;
897 log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
898
899 /* This might actually not return, but cause a
900 * reexecution */
901 if (selinux_setup(argv) < 0)
902 goto finish;
903
904 if (label_init() < 0)
905 goto finish;
906 } else {
907 arg_running_as = MANAGER_SESSION;
908 log_set_target(LOG_TARGET_CONSOLE);
909 }
910
911 if (set_default_unit(SPECIAL_DEFAULT_TARGET) < 0)
912 goto finish;
913
914 /* Mount /proc, /sys and friends, so that /proc/cmdline and
915 * /proc/$PID/fd is available. */
916 if (geteuid() == 0 && !getenv("SYSTEMD_SKIP_API_MOUNTS"))
917 if (mount_setup() < 0)
918 goto finish;
919
920 /* Reset all signal handlers. */
921 assert_se(reset_all_signal_handlers() == 0);
922
923 /* If we are init, we can block sigkill. Yay. */
924 ignore_signals(SIGNALS_IGNORE, -1);
925
926 if (parse_config_file() < 0)
927 goto finish;
928
929 if (arg_running_as == MANAGER_SYSTEM)
930 if (parse_proc_cmdline() < 0)
931 goto finish;
932
933 log_parse_environment();
934
935 if (parse_argv(argc, argv) < 0)
936 goto finish;
937
938 if (arg_action == ACTION_HELP) {
939 retval = help();
940 goto finish;
941 } else if (arg_action == ACTION_DUMP_CONFIGURATION_ITEMS) {
942 unit_dump_config_items(stdout);
943 retval = EXIT_SUCCESS;
944 goto finish;
945 } else if (arg_action == ACTION_DONE) {
946 retval = EXIT_SUCCESS;
947 goto finish;
948 }
949
950 assert_se(arg_action == ACTION_RUN || arg_action == ACTION_TEST);
951
952 /* Remember open file descriptors for later deserialization */
953 if (serialization) {
954 if ((r = fdset_new_fill(&fds)) < 0) {
955 log_error("Failed to allocate fd set: %s", strerror(-r));
956 goto finish;
957 }
958
959 assert_se(fdset_remove(fds, fileno(serialization)) >= 0);
960 } else
961 close_all_fds(NULL, 0);
962
963 /* Set up PATH unless it is already set */
964 setenv("PATH",
965 "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
966 arg_running_as == MANAGER_SYSTEM);
967
968 /* Unset some environment variables passed in from the kernel
969 * that don't really make sense for us. */
970 if (arg_running_as == MANAGER_SYSTEM) {
971 unsetenv("HOME");
972 unsetenv("TERM");
973 }
974
975 /* Move out of the way, so that we won't block unmounts */
976 assert_se(chdir("/") == 0);
977
978 if (arg_running_as == MANAGER_SYSTEM) {
979 /* Become a session leader if we aren't one yet. */
980 setsid();
981
982 /* Disable the umask logic */
983 umask(0);
984 }
985
986 /* Make sure D-Bus doesn't fiddle with the SIGPIPE handlers */
987 dbus_connection_set_change_sigpipe(FALSE);
988
989 /* Reset the console, but only if this is really init and we
990 * are freshly booted */
991 if (arg_running_as == MANAGER_SYSTEM && arg_action == ACTION_RUN) {
992 console_setup(getpid() == 1 && !serialization);
993 make_null_stdio();
994 }
995
996 /* Open the logging devices, if possible and necessary */
997 log_open();
998
999 /* Make sure we leave a core dump without panicing the
1000 * kernel. */
1001 if (getpid() == 1)
1002 install_crash_handler();
1003
1004 log_full(arg_running_as == MANAGER_SYSTEM ? LOG_INFO : LOG_DEBUG,
1005 PACKAGE_STRING " running in %s mode. (" SYSTEMD_FEATURES "; " DISTRIBUTION ")", manager_running_as_to_string(arg_running_as));
1006
1007 if (arg_running_as == MANAGER_SYSTEM && !serialization) {
1008 locale_setup();
1009
1010 if (arg_show_status)
1011 status_welcome();
1012
1013 kmod_setup();
1014 hostname_setup();
1015 loopback_setup();
1016
1017 mkdir_p("/dev/.systemd/ask-password/", 0755);
1018 }
1019
1020 if ((r = manager_new(arg_running_as, &m)) < 0) {
1021 log_error("Failed to allocate manager object: %s", strerror(-r));
1022 goto finish;
1023 }
1024
1025 m->confirm_spawn = arg_confirm_spawn;
1026 m->show_status = arg_show_status;
1027 #ifdef HAVE_SYSV_COMPAT
1028 m->sysv_console = arg_sysv_console;
1029 #endif
1030 m->mount_auto = arg_mount_auto;
1031 m->swap_auto = arg_swap_auto;
1032
1033 if (arg_console)
1034 manager_set_console(m, arg_console);
1035
1036 if ((r = manager_startup(m, serialization, fds)) < 0)
1037 log_error("Failed to fully start up daemon: %s", strerror(-r));
1038
1039 if (fds) {
1040 /* This will close all file descriptors that were opened, but
1041 * not claimed by any unit. */
1042
1043 fdset_free(fds);
1044 fds = NULL;
1045 }
1046
1047 if (serialization) {
1048 fclose(serialization);
1049 serialization = NULL;
1050 } else {
1051 DBusError error;
1052 Unit *target = NULL;
1053
1054 dbus_error_init(&error);
1055
1056 log_debug("Activating default unit: %s", arg_default_unit);
1057
1058 if ((r = manager_load_unit(m, arg_default_unit, NULL, &error, &target)) < 0) {
1059 log_error("Failed to load default target: %s", bus_error(&error, r));
1060 dbus_error_free(&error);
1061 } else if (target->meta.load_state == UNIT_ERROR)
1062 log_error("Failed to load default target: %s", strerror(-target->meta.load_error));
1063 else if (target->meta.load_state == UNIT_MASKED)
1064 log_error("Default target masked.");
1065
1066 if (!target || target->meta.load_state != UNIT_LOADED) {
1067 log_info("Trying to load rescue target...");
1068
1069 if ((r = manager_load_unit(m, SPECIAL_RESCUE_TARGET, NULL, &error, &target)) < 0) {
1070 log_error("Failed to load rescue target: %s", bus_error(&error, r));
1071 dbus_error_free(&error);
1072 goto finish;
1073 } else if (target->meta.load_state == UNIT_ERROR) {
1074 log_error("Failed to load rescue target: %s", strerror(-target->meta.load_error));
1075 goto finish;
1076 } else if (target->meta.load_state == UNIT_MASKED) {
1077 log_error("Rescue target masked.");
1078 goto finish;
1079 }
1080 }
1081
1082 assert(target->meta.load_state == UNIT_LOADED);
1083
1084 if (arg_action == ACTION_TEST) {
1085 printf("-> By units:\n");
1086 manager_dump_units(m, stdout, "\t");
1087 }
1088
1089 if ((r = manager_add_job(m, JOB_START, target, JOB_REPLACE, false, &error, NULL)) < 0) {
1090 log_error("Failed to start default target: %s", bus_error(&error, r));
1091 dbus_error_free(&error);
1092 goto finish;
1093 }
1094
1095 if (arg_action == ACTION_TEST) {
1096 printf("-> By jobs:\n");
1097 manager_dump_jobs(m, stdout, "\t");
1098 retval = EXIT_SUCCESS;
1099 goto finish;
1100 }
1101 }
1102
1103 for (;;) {
1104 if ((r = manager_loop(m)) < 0) {
1105 log_error("Failed to run mainloop: %s", strerror(-r));
1106 goto finish;
1107 }
1108
1109 switch (m->exit_code) {
1110
1111 case MANAGER_EXIT:
1112 retval = EXIT_SUCCESS;
1113 log_debug("Exit.");
1114 goto finish;
1115
1116 case MANAGER_RELOAD:
1117 log_info("Reloading.");
1118 if ((r = manager_reload(m)) < 0)
1119 log_error("Failed to reload: %s", strerror(-r));
1120 break;
1121
1122 case MANAGER_REEXECUTE:
1123 if (prepare_reexecute(m, &serialization, &fds) < 0)
1124 goto finish;
1125
1126 reexecute = true;
1127 log_notice("Reexecuting.");
1128 goto finish;
1129
1130 case MANAGER_REBOOT:
1131 case MANAGER_POWEROFF:
1132 case MANAGER_HALT:
1133 case MANAGER_KEXEC: {
1134 static const char * const table[_MANAGER_EXIT_CODE_MAX] = {
1135 [MANAGER_REBOOT] = "reboot",
1136 [MANAGER_POWEROFF] = "poweroff",
1137 [MANAGER_HALT] = "halt",
1138 [MANAGER_KEXEC] = "kexec"
1139 };
1140
1141 assert_se(shutdown_verb = table[m->exit_code]);
1142
1143 log_notice("Shutting down.");
1144 goto finish;
1145 }
1146
1147 default:
1148 assert_not_reached("Unknown exit code.");
1149 }
1150 }
1151
1152 finish:
1153 if (m)
1154 manager_free(m);
1155
1156 free(arg_default_unit);
1157 free(arg_console);
1158
1159 dbus_shutdown();
1160
1161 label_finish();
1162
1163 if (reexecute) {
1164 const char *args[15];
1165 unsigned i = 0;
1166 char sfd[16];
1167
1168 assert(serialization);
1169 assert(fds);
1170
1171 args[i++] = SYSTEMD_BINARY_PATH;
1172
1173 args[i++] = "--log-level";
1174 args[i++] = log_level_to_string(log_get_max_level());
1175
1176 args[i++] = "--log-target";
1177 args[i++] = log_target_to_string(log_get_target());
1178
1179 if (arg_running_as == MANAGER_SYSTEM)
1180 args[i++] = "--system";
1181 else
1182 args[i++] = "--session";
1183
1184 if (arg_dump_core)
1185 args[i++] = "--dump-core";
1186
1187 if (arg_crash_shell)
1188 args[i++] = "--crash-shell";
1189
1190 if (arg_confirm_spawn)
1191 args[i++] = "--confirm-spawn";
1192
1193 if (arg_show_status)
1194 args[i++] = "--show-status=1";
1195 else
1196 args[i++] = "--show-status=0";
1197
1198 #ifdef HAVE_SYSV_COMPAT
1199 if (arg_sysv_console)
1200 args[i++] = "--sysv-console=1";
1201 else
1202 args[i++] = "--sysv-console=0";
1203 #endif
1204
1205 snprintf(sfd, sizeof(sfd), "%i", fileno(serialization));
1206 char_array_0(sfd);
1207
1208 args[i++] = "--deserialize";
1209 args[i++] = sfd;
1210
1211 args[i++] = NULL;
1212
1213 assert(i <= ELEMENTSOF(args));
1214
1215 execv(args[0], (char* const*) args);
1216
1217 log_error("Failed to reexecute: %m");
1218 }
1219
1220 if (serialization)
1221 fclose(serialization);
1222
1223 if (fds)
1224 fdset_free(fds);
1225
1226 if (shutdown_verb) {
1227 const char * command_line[] = {
1228 SYSTEMD_SHUTDOWN_BINARY_PATH,
1229 shutdown_verb,
1230 NULL
1231 };
1232
1233 execv(SYSTEMD_SHUTDOWN_BINARY_PATH, (char **) command_line);
1234 log_error("Failed to execute shutdown binary, freezing: %m");
1235 }
1236
1237 if (getpid() == 1)
1238 freeze();
1239
1240 return retval;
1241 }
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