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Merge pull request #6536 from yuwata/fix-warning
[thirdparty/systemd.git] / src / core / manager.c
1 /***
2 This file is part of systemd.
3
4 Copyright 2010 Lennart Poettering
5
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
10
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
18 ***/
19
20 #include <errno.h>
21 #include <fcntl.h>
22 #include <linux/kd.h>
23 #include <signal.h>
24 #include <string.h>
25 #include <sys/epoll.h>
26 #include <sys/inotify.h>
27 #include <sys/ioctl.h>
28 #include <sys/reboot.h>
29 #include <sys/timerfd.h>
30 #include <sys/wait.h>
31 #include <unistd.h>
32
33 #ifdef HAVE_AUDIT
34 #include <libaudit.h>
35 #endif
36
37 #include "sd-daemon.h"
38 #include "sd-messages.h"
39 #include "sd-path.h"
40
41 #include "alloc-util.h"
42 #include "audit-fd.h"
43 #include "boot-timestamps.h"
44 #include "bus-common-errors.h"
45 #include "bus-error.h"
46 #include "bus-kernel.h"
47 #include "bus-util.h"
48 #include "clean-ipc.h"
49 #include "dbus-job.h"
50 #include "dbus-manager.h"
51 #include "dbus-unit.h"
52 #include "dbus.h"
53 #include "dirent-util.h"
54 #include "env-util.h"
55 #include "escape.h"
56 #include "execute.h"
57 #include "exec-util.h"
58 #include "exit-status.h"
59 #include "fd-util.h"
60 #include "fileio.h"
61 #include "fs-util.h"
62 #include "hashmap.h"
63 #include "io-util.h"
64 #include "locale-setup.h"
65 #include "log.h"
66 #include "macro.h"
67 #include "manager.h"
68 #include "missing.h"
69 #include "mkdir.h"
70 #include "parse-util.h"
71 #include "path-lookup.h"
72 #include "path-util.h"
73 #include "process-util.h"
74 #include "ratelimit.h"
75 #include "rm-rf.h"
76 #include "signal-util.h"
77 #include "special.h"
78 #include "stat-util.h"
79 #include "string-table.h"
80 #include "string-util.h"
81 #include "strv.h"
82 #include "terminal-util.h"
83 #include "time-util.h"
84 #include "transaction.h"
85 #include "umask-util.h"
86 #include "unit-name.h"
87 #include "user-util.h"
88 #include "util.h"
89 #include "virt.h"
90 #include "watchdog.h"
91
92 #define NOTIFY_RCVBUF_SIZE (8*1024*1024)
93 #define CGROUPS_AGENT_RCVBUF_SIZE (8*1024*1024)
94
95 /* Initial delay and the interval for printing status messages about running jobs */
96 #define JOBS_IN_PROGRESS_WAIT_USEC (5*USEC_PER_SEC)
97 #define JOBS_IN_PROGRESS_PERIOD_USEC (USEC_PER_SEC / 3)
98 #define JOBS_IN_PROGRESS_PERIOD_DIVISOR 3
99
100 static int manager_dispatch_notify_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata);
101 static int manager_dispatch_cgroups_agent_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata);
102 static int manager_dispatch_signal_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata);
103 static int manager_dispatch_time_change_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata);
104 static int manager_dispatch_idle_pipe_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata);
105 static int manager_dispatch_user_lookup_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata);
106 static int manager_dispatch_jobs_in_progress(sd_event_source *source, usec_t usec, void *userdata);
107 static int manager_dispatch_run_queue(sd_event_source *source, void *userdata);
108 static int manager_run_environment_generators(Manager *m);
109 static int manager_run_generators(Manager *m);
110
111 static void manager_watch_jobs_in_progress(Manager *m) {
112 usec_t next;
113 int r;
114
115 assert(m);
116
117 /* We do not want to show the cylon animation if the user
118 * needs to confirm service executions otherwise confirmation
119 * messages will be screwed by the cylon animation. */
120 if (!manager_is_confirm_spawn_disabled(m))
121 return;
122
123 if (m->jobs_in_progress_event_source)
124 return;
125
126 next = now(CLOCK_MONOTONIC) + JOBS_IN_PROGRESS_WAIT_USEC;
127 r = sd_event_add_time(
128 m->event,
129 &m->jobs_in_progress_event_source,
130 CLOCK_MONOTONIC,
131 next, 0,
132 manager_dispatch_jobs_in_progress, m);
133 if (r < 0)
134 return;
135
136 (void) sd_event_source_set_description(m->jobs_in_progress_event_source, "manager-jobs-in-progress");
137 }
138
139 #define CYLON_BUFFER_EXTRA (2*(sizeof(ANSI_RED)-1) + sizeof(ANSI_HIGHLIGHT_RED)-1 + 2*(sizeof(ANSI_NORMAL)-1))
140
141 static void draw_cylon(char buffer[], size_t buflen, unsigned width, unsigned pos) {
142 char *p = buffer;
143
144 assert(buflen >= CYLON_BUFFER_EXTRA + width + 1);
145 assert(pos <= width+1); /* 0 or width+1 mean that the center light is behind the corner */
146
147 if (pos > 1) {
148 if (pos > 2)
149 p = mempset(p, ' ', pos-2);
150 if (log_get_show_color())
151 p = stpcpy(p, ANSI_RED);
152 *p++ = '*';
153 }
154
155 if (pos > 0 && pos <= width) {
156 if (log_get_show_color())
157 p = stpcpy(p, ANSI_HIGHLIGHT_RED);
158 *p++ = '*';
159 }
160
161 if (log_get_show_color())
162 p = stpcpy(p, ANSI_NORMAL);
163
164 if (pos < width) {
165 if (log_get_show_color())
166 p = stpcpy(p, ANSI_RED);
167 *p++ = '*';
168 if (pos < width-1)
169 p = mempset(p, ' ', width-1-pos);
170 if (log_get_show_color())
171 strcpy(p, ANSI_NORMAL);
172 }
173 }
174
175 void manager_flip_auto_status(Manager *m, bool enable) {
176 assert(m);
177
178 if (enable) {
179 if (m->show_status == SHOW_STATUS_AUTO)
180 manager_set_show_status(m, SHOW_STATUS_TEMPORARY);
181 } else {
182 if (m->show_status == SHOW_STATUS_TEMPORARY)
183 manager_set_show_status(m, SHOW_STATUS_AUTO);
184 }
185 }
186
187 static void manager_print_jobs_in_progress(Manager *m) {
188 _cleanup_free_ char *job_of_n = NULL;
189 Iterator i;
190 Job *j;
191 unsigned counter = 0, print_nr;
192 char cylon[6 + CYLON_BUFFER_EXTRA + 1];
193 unsigned cylon_pos;
194 char time[FORMAT_TIMESPAN_MAX], limit[FORMAT_TIMESPAN_MAX] = "no limit";
195 uint64_t x;
196
197 assert(m);
198 assert(m->n_running_jobs > 0);
199
200 manager_flip_auto_status(m, true);
201
202 print_nr = (m->jobs_in_progress_iteration / JOBS_IN_PROGRESS_PERIOD_DIVISOR) % m->n_running_jobs;
203
204 HASHMAP_FOREACH(j, m->jobs, i)
205 if (j->state == JOB_RUNNING && counter++ == print_nr)
206 break;
207
208 /* m->n_running_jobs must be consistent with the contents of m->jobs,
209 * so the above loop must have succeeded in finding j. */
210 assert(counter == print_nr + 1);
211 assert(j);
212
213 cylon_pos = m->jobs_in_progress_iteration % 14;
214 if (cylon_pos >= 8)
215 cylon_pos = 14 - cylon_pos;
216 draw_cylon(cylon, sizeof(cylon), 6, cylon_pos);
217
218 m->jobs_in_progress_iteration++;
219
220 if (m->n_running_jobs > 1) {
221 if (asprintf(&job_of_n, "(%u of %u) ", counter, m->n_running_jobs) < 0)
222 job_of_n = NULL;
223 }
224
225 format_timespan(time, sizeof(time), now(CLOCK_MONOTONIC) - j->begin_usec, 1*USEC_PER_SEC);
226 if (job_get_timeout(j, &x) > 0)
227 format_timespan(limit, sizeof(limit), x - j->begin_usec, 1*USEC_PER_SEC);
228
229 manager_status_printf(m, STATUS_TYPE_EPHEMERAL, cylon,
230 "%sA %s job is running for %s (%s / %s)",
231 strempty(job_of_n),
232 job_type_to_string(j->type),
233 unit_description(j->unit),
234 time, limit);
235 }
236
237 static int have_ask_password(void) {
238 _cleanup_closedir_ DIR *dir;
239 struct dirent *de;
240
241 dir = opendir("/run/systemd/ask-password");
242 if (!dir) {
243 if (errno == ENOENT)
244 return false;
245 else
246 return -errno;
247 }
248
249 FOREACH_DIRENT_ALL(de, dir, return -errno) {
250 if (startswith(de->d_name, "ask."))
251 return true;
252 }
253 return false;
254 }
255
256 static int manager_dispatch_ask_password_fd(sd_event_source *source,
257 int fd, uint32_t revents, void *userdata) {
258 Manager *m = userdata;
259
260 assert(m);
261
262 flush_fd(fd);
263
264 m->have_ask_password = have_ask_password();
265 if (m->have_ask_password < 0)
266 /* Log error but continue. Negative have_ask_password
267 * is treated as unknown status. */
268 log_error_errno(m->have_ask_password, "Failed to list /run/systemd/ask-password: %m");
269
270 return 0;
271 }
272
273 static void manager_close_ask_password(Manager *m) {
274 assert(m);
275
276 m->ask_password_event_source = sd_event_source_unref(m->ask_password_event_source);
277 m->ask_password_inotify_fd = safe_close(m->ask_password_inotify_fd);
278 m->have_ask_password = -EINVAL;
279 }
280
281 static int manager_check_ask_password(Manager *m) {
282 int r;
283
284 assert(m);
285
286 if (!m->ask_password_event_source) {
287 assert(m->ask_password_inotify_fd < 0);
288
289 mkdir_p_label("/run/systemd/ask-password", 0755);
290
291 m->ask_password_inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
292 if (m->ask_password_inotify_fd < 0)
293 return log_error_errno(errno, "inotify_init1() failed: %m");
294
295 if (inotify_add_watch(m->ask_password_inotify_fd, "/run/systemd/ask-password", IN_CREATE|IN_DELETE|IN_MOVE) < 0) {
296 log_error_errno(errno, "Failed to add watch on /run/systemd/ask-password: %m");
297 manager_close_ask_password(m);
298 return -errno;
299 }
300
301 r = sd_event_add_io(m->event, &m->ask_password_event_source,
302 m->ask_password_inotify_fd, EPOLLIN,
303 manager_dispatch_ask_password_fd, m);
304 if (r < 0) {
305 log_error_errno(errno, "Failed to add event source for /run/systemd/ask-password: %m");
306 manager_close_ask_password(m);
307 return -errno;
308 }
309
310 (void) sd_event_source_set_description(m->ask_password_event_source, "manager-ask-password");
311
312 /* Queries might have been added meanwhile... */
313 manager_dispatch_ask_password_fd(m->ask_password_event_source,
314 m->ask_password_inotify_fd, EPOLLIN, m);
315 }
316
317 return m->have_ask_password;
318 }
319
320 static int manager_watch_idle_pipe(Manager *m) {
321 int r;
322
323 assert(m);
324
325 if (m->idle_pipe_event_source)
326 return 0;
327
328 if (m->idle_pipe[2] < 0)
329 return 0;
330
331 r = sd_event_add_io(m->event, &m->idle_pipe_event_source, m->idle_pipe[2], EPOLLIN, manager_dispatch_idle_pipe_fd, m);
332 if (r < 0)
333 return log_error_errno(r, "Failed to watch idle pipe: %m");
334
335 (void) sd_event_source_set_description(m->idle_pipe_event_source, "manager-idle-pipe");
336
337 return 0;
338 }
339
340 static void manager_close_idle_pipe(Manager *m) {
341 assert(m);
342
343 m->idle_pipe_event_source = sd_event_source_unref(m->idle_pipe_event_source);
344
345 safe_close_pair(m->idle_pipe);
346 safe_close_pair(m->idle_pipe + 2);
347 }
348
349 static int manager_setup_time_change(Manager *m) {
350 int r;
351
352 /* We only care for the cancellation event, hence we set the
353 * timeout to the latest possible value. */
354 struct itimerspec its = {
355 .it_value.tv_sec = TIME_T_MAX,
356 };
357
358 assert(m);
359 assert_cc(sizeof(time_t) == sizeof(TIME_T_MAX));
360
361 if (m->test_run)
362 return 0;
363
364 /* Uses TFD_TIMER_CANCEL_ON_SET to get notifications whenever
365 * CLOCK_REALTIME makes a jump relative to CLOCK_MONOTONIC */
366
367 m->time_change_fd = timerfd_create(CLOCK_REALTIME, TFD_NONBLOCK|TFD_CLOEXEC);
368 if (m->time_change_fd < 0)
369 return log_error_errno(errno, "Failed to create timerfd: %m");
370
371 if (timerfd_settime(m->time_change_fd, TFD_TIMER_ABSTIME|TFD_TIMER_CANCEL_ON_SET, &its, NULL) < 0) {
372 log_debug_errno(errno, "Failed to set up TFD_TIMER_CANCEL_ON_SET, ignoring: %m");
373 m->time_change_fd = safe_close(m->time_change_fd);
374 return 0;
375 }
376
377 r = sd_event_add_io(m->event, &m->time_change_event_source, m->time_change_fd, EPOLLIN, manager_dispatch_time_change_fd, m);
378 if (r < 0)
379 return log_error_errno(r, "Failed to create time change event source: %m");
380
381 (void) sd_event_source_set_description(m->time_change_event_source, "manager-time-change");
382
383 log_debug("Set up TFD_TIMER_CANCEL_ON_SET timerfd.");
384
385 return 0;
386 }
387
388 static int enable_special_signals(Manager *m) {
389 _cleanup_close_ int fd = -1;
390
391 assert(m);
392
393 if (m->test_run)
394 return 0;
395
396 /* Enable that we get SIGINT on control-alt-del. In containers
397 * this will fail with EPERM (older) or EINVAL (newer), so
398 * ignore that. */
399 if (reboot(RB_DISABLE_CAD) < 0 && errno != EPERM && errno != EINVAL)
400 log_warning_errno(errno, "Failed to enable ctrl-alt-del handling: %m");
401
402 fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC);
403 if (fd < 0) {
404 /* Support systems without virtual console */
405 if (fd != -ENOENT)
406 log_warning_errno(errno, "Failed to open /dev/tty0: %m");
407 } else {
408 /* Enable that we get SIGWINCH on kbrequest */
409 if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0)
410 log_warning_errno(errno, "Failed to enable kbrequest handling: %m");
411 }
412
413 return 0;
414 }
415
416 static int manager_setup_signals(Manager *m) {
417 struct sigaction sa = {
418 .sa_handler = SIG_DFL,
419 .sa_flags = SA_NOCLDSTOP|SA_RESTART,
420 };
421 sigset_t mask;
422 int r;
423
424 assert(m);
425
426 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
427
428 /* We make liberal use of realtime signals here. On
429 * Linux/glibc we have 30 of them (with the exception of Linux
430 * on hppa, see below), between SIGRTMIN+0 ... SIGRTMIN+30
431 * (aka SIGRTMAX). */
432
433 assert_se(sigemptyset(&mask) == 0);
434 sigset_add_many(&mask,
435 SIGCHLD, /* Child died */
436 SIGTERM, /* Reexecute daemon */
437 SIGHUP, /* Reload configuration */
438 SIGUSR1, /* systemd/upstart: reconnect to D-Bus */
439 SIGUSR2, /* systemd: dump status */
440 SIGINT, /* Kernel sends us this on control-alt-del */
441 SIGWINCH, /* Kernel sends us this on kbrequest (alt-arrowup) */
442 SIGPWR, /* Some kernel drivers and upsd send us this on power failure */
443
444 SIGRTMIN+0, /* systemd: start default.target */
445 SIGRTMIN+1, /* systemd: isolate rescue.target */
446 SIGRTMIN+2, /* systemd: isolate emergency.target */
447 SIGRTMIN+3, /* systemd: start halt.target */
448 SIGRTMIN+4, /* systemd: start poweroff.target */
449 SIGRTMIN+5, /* systemd: start reboot.target */
450 SIGRTMIN+6, /* systemd: start kexec.target */
451
452 /* ... space for more special targets ... */
453
454 SIGRTMIN+13, /* systemd: Immediate halt */
455 SIGRTMIN+14, /* systemd: Immediate poweroff */
456 SIGRTMIN+15, /* systemd: Immediate reboot */
457 SIGRTMIN+16, /* systemd: Immediate kexec */
458
459 /* ... space for more immediate system state changes ... */
460
461 SIGRTMIN+20, /* systemd: enable status messages */
462 SIGRTMIN+21, /* systemd: disable status messages */
463 SIGRTMIN+22, /* systemd: set log level to LOG_DEBUG */
464 SIGRTMIN+23, /* systemd: set log level to LOG_INFO */
465 SIGRTMIN+24, /* systemd: Immediate exit (--user only) */
466
467 /* .. one free signal here ... */
468
469 #if !defined(__hppa64__) && !defined(__hppa__)
470 /* Apparently Linux on hppa has fewer RT
471 * signals (SIGRTMAX is SIGRTMIN+25 there),
472 * hence let's not try to make use of them
473 * here. Since these commands are accessible
474 * by different means and only really a safety
475 * net, the missing functionality on hppa
476 * shouldn't matter. */
477
478 SIGRTMIN+26, /* systemd: set log target to journal-or-kmsg */
479 SIGRTMIN+27, /* systemd: set log target to console */
480 SIGRTMIN+28, /* systemd: set log target to kmsg */
481 SIGRTMIN+29, /* systemd: set log target to syslog-or-kmsg (obsolete) */
482
483 /* ... one free signal here SIGRTMIN+30 ... */
484 #endif
485 -1);
486 assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
487
488 m->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
489 if (m->signal_fd < 0)
490 return -errno;
491
492 r = sd_event_add_io(m->event, &m->signal_event_source, m->signal_fd, EPOLLIN, manager_dispatch_signal_fd, m);
493 if (r < 0)
494 return r;
495
496 (void) sd_event_source_set_description(m->signal_event_source, "manager-signal");
497
498 /* Process signals a bit earlier than the rest of things, but later than notify_fd processing, so that the
499 * notify processing can still figure out to which process/service a message belongs, before we reap the
500 * process. Also, process this before handling cgroup notifications, so that we always collect child exit
501 * status information before detecting that there's no process in a cgroup. */
502 r = sd_event_source_set_priority(m->signal_event_source, SD_EVENT_PRIORITY_NORMAL-6);
503 if (r < 0)
504 return r;
505
506 if (MANAGER_IS_SYSTEM(m))
507 return enable_special_signals(m);
508
509 return 0;
510 }
511
512 static void manager_clean_environment(Manager *m) {
513 assert(m);
514
515 /* Let's remove some environment variables that we
516 * need ourselves to communicate with our clients */
517 strv_env_unset_many(
518 m->environment,
519 "NOTIFY_SOCKET",
520 "MAINPID",
521 "MANAGERPID",
522 "LISTEN_PID",
523 "LISTEN_FDS",
524 "LISTEN_FDNAMES",
525 "WATCHDOG_PID",
526 "WATCHDOG_USEC",
527 "INVOCATION_ID",
528 NULL);
529 }
530
531 static int manager_default_environment(Manager *m) {
532 assert(m);
533
534 if (MANAGER_IS_SYSTEM(m)) {
535 /* The system manager always starts with a clean
536 * environment for its children. It does not import
537 * the kernel's or the parents' exported variables.
538 *
539 * The initial passed environment is untouched to keep
540 * /proc/self/environ valid; it is used for tagging
541 * the init process inside containers. */
542 m->environment = strv_new("PATH=" DEFAULT_PATH,
543 NULL);
544
545 /* Import locale variables LC_*= from configuration */
546 locale_setup(&m->environment);
547 } else
548 /* The user manager passes its own environment
549 * along to its children. */
550 m->environment = strv_copy(environ);
551
552 if (!m->environment)
553 return -ENOMEM;
554
555 manager_clean_environment(m);
556 strv_sort(m->environment);
557
558 return 0;
559 }
560
561 static int manager_setup_prefix(Manager *m) {
562 struct table_entry {
563 uint64_t type;
564 const char *suffix;
565 };
566
567 static const struct table_entry paths_system[_EXEC_DIRECTORY_MAX] = {
568 [EXEC_DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME, NULL },
569 [EXEC_DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE, NULL },
570 [EXEC_DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE, NULL },
571 [EXEC_DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS, NULL },
572 [EXEC_DIRECTORY_CONFIGURATION] = { SD_PATH_SYSTEM_CONFIGURATION, NULL },
573 };
574
575 static const struct table_entry paths_user[_EXEC_DIRECTORY_MAX] = {
576 [EXEC_DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME, NULL },
577 [EXEC_DIRECTORY_STATE] = { SD_PATH_USER_CONFIGURATION, NULL },
578 [EXEC_DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE, NULL },
579 [EXEC_DIRECTORY_LOGS] = { SD_PATH_SYSTEM_CONFIGURATION, "log" },
580 [EXEC_DIRECTORY_CONFIGURATION] = { SD_PATH_SYSTEM_CONFIGURATION, NULL },
581 };
582
583 const struct table_entry *p;
584 ExecDirectoryType i;
585 int r;
586
587 assert(m);
588
589 if (MANAGER_IS_SYSTEM(m))
590 p = paths_system;
591 else
592 p = paths_user;
593
594 for (i = 0; i < _EXEC_DIRECTORY_MAX; i++) {
595 r = sd_path_home(p[i].type, p[i].suffix, &m->prefix[i]);
596 if (r < 0)
597 return r;
598 }
599
600 return 0;
601 }
602
603 int manager_new(UnitFileScope scope, bool test_run, Manager **_m) {
604 Manager *m;
605 int r;
606
607 assert(_m);
608 assert(IN_SET(scope, UNIT_FILE_SYSTEM, UNIT_FILE_USER));
609
610 m = new0(Manager, 1);
611 if (!m)
612 return -ENOMEM;
613
614 m->unit_file_scope = scope;
615 m->exit_code = _MANAGER_EXIT_CODE_INVALID;
616 m->default_timer_accuracy_usec = USEC_PER_MINUTE;
617 m->default_tasks_accounting = true;
618 m->default_tasks_max = UINT64_MAX;
619
620 #ifdef ENABLE_EFI
621 if (MANAGER_IS_SYSTEM(m) && detect_container() <= 0)
622 boot_timestamps(&m->userspace_timestamp, &m->firmware_timestamp, &m->loader_timestamp);
623 #endif
624
625 /* Prepare log fields we can use for structured logging */
626 if (MANAGER_IS_SYSTEM(m)) {
627 m->unit_log_field = "UNIT=";
628 m->unit_log_format_string = "UNIT=%s";
629
630 m->invocation_log_field = "INVOCATION_ID=";
631 m->invocation_log_format_string = "INVOCATION_ID=" SD_ID128_FORMAT_STR;
632 } else {
633 m->unit_log_field = "USER_UNIT=";
634 m->unit_log_format_string = "USER_UNIT=%s";
635
636 m->invocation_log_field = "USER_INVOCATION_ID=";
637 m->invocation_log_format_string = "USER_INVOCATION_ID=" SD_ID128_FORMAT_STR;
638 }
639
640 m->idle_pipe[0] = m->idle_pipe[1] = m->idle_pipe[2] = m->idle_pipe[3] = -1;
641
642 m->pin_cgroupfs_fd = m->notify_fd = m->cgroups_agent_fd = m->signal_fd = m->time_change_fd =
643 m->dev_autofs_fd = m->private_listen_fd = m->cgroup_inotify_fd =
644 m->ask_password_inotify_fd = -1;
645
646 m->user_lookup_fds[0] = m->user_lookup_fds[1] = -1;
647
648 m->current_job_id = 1; /* start as id #1, so that we can leave #0 around as "null-like" value */
649
650 m->have_ask_password = -EINVAL; /* we don't know */
651 m->first_boot = -1;
652
653 m->test_run = test_run;
654
655 /* Reboot immediately if the user hits C-A-D more often than 7x per 2s */
656 RATELIMIT_INIT(m->ctrl_alt_del_ratelimit, 2 * USEC_PER_SEC, 7);
657
658 r = manager_default_environment(m);
659 if (r < 0)
660 goto fail;
661
662 r = hashmap_ensure_allocated(&m->units, &string_hash_ops);
663 if (r < 0)
664 goto fail;
665
666 r = hashmap_ensure_allocated(&m->jobs, NULL);
667 if (r < 0)
668 goto fail;
669
670 r = hashmap_ensure_allocated(&m->cgroup_unit, &string_hash_ops);
671 if (r < 0)
672 goto fail;
673
674 r = hashmap_ensure_allocated(&m->watch_bus, &string_hash_ops);
675 if (r < 0)
676 goto fail;
677
678 r = sd_event_default(&m->event);
679 if (r < 0)
680 goto fail;
681
682 r = sd_event_add_defer(m->event, &m->run_queue_event_source, manager_dispatch_run_queue, m);
683 if (r < 0)
684 goto fail;
685
686 r = sd_event_source_set_priority(m->run_queue_event_source, SD_EVENT_PRIORITY_IDLE);
687 if (r < 0)
688 goto fail;
689
690 r = sd_event_source_set_enabled(m->run_queue_event_source, SD_EVENT_OFF);
691 if (r < 0)
692 goto fail;
693
694 (void) sd_event_source_set_description(m->run_queue_event_source, "manager-run-queue");
695
696 r = manager_setup_signals(m);
697 if (r < 0)
698 goto fail;
699
700 r = manager_setup_cgroup(m);
701 if (r < 0)
702 goto fail;
703
704 r = manager_setup_time_change(m);
705 if (r < 0)
706 goto fail;
707
708 m->udev = udev_new();
709 if (!m->udev) {
710 r = -ENOMEM;
711 goto fail;
712 }
713
714 /* Note that we do not set up the notify fd here. We do that after deserialization,
715 * since they might have gotten serialized across the reexec. */
716
717 m->taint_usr = dir_is_empty("/usr") > 0;
718
719 r = manager_setup_prefix(m);
720 if (r < 0)
721 goto fail;
722
723 *_m = m;
724 return 0;
725
726 fail:
727 manager_free(m);
728 return r;
729 }
730
731 static int manager_setup_notify(Manager *m) {
732 int r;
733
734 if (m->test_run)
735 return 0;
736
737 if (m->notify_fd < 0) {
738 _cleanup_close_ int fd = -1;
739 union sockaddr_union sa = {
740 .sa.sa_family = AF_UNIX,
741 };
742 static const int one = 1;
743
744 /* First free all secondary fields */
745 m->notify_socket = mfree(m->notify_socket);
746 m->notify_event_source = sd_event_source_unref(m->notify_event_source);
747
748 fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
749 if (fd < 0)
750 return log_error_errno(errno, "Failed to allocate notification socket: %m");
751
752 fd_inc_rcvbuf(fd, NOTIFY_RCVBUF_SIZE);
753
754 m->notify_socket = strappend(m->prefix[EXEC_DIRECTORY_RUNTIME], "/systemd/notify");
755 if (!m->notify_socket)
756 return log_oom();
757
758 (void) mkdir_parents_label(m->notify_socket, 0755);
759 (void) unlink(m->notify_socket);
760
761 strncpy(sa.un.sun_path, m->notify_socket, sizeof(sa.un.sun_path)-1);
762 r = bind(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un));
763 if (r < 0)
764 return log_error_errno(errno, "bind(%s) failed: %m", sa.un.sun_path);
765
766 r = setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one));
767 if (r < 0)
768 return log_error_errno(errno, "SO_PASSCRED failed: %m");
769
770 m->notify_fd = fd;
771 fd = -1;
772
773 log_debug("Using notification socket %s", m->notify_socket);
774 }
775
776 if (!m->notify_event_source) {
777 r = sd_event_add_io(m->event, &m->notify_event_source, m->notify_fd, EPOLLIN, manager_dispatch_notify_fd, m);
778 if (r < 0)
779 return log_error_errno(r, "Failed to allocate notify event source: %m");
780
781 /* Process notification messages a bit earlier than SIGCHLD, so that we can still identify to which
782 * service an exit message belongs. */
783 r = sd_event_source_set_priority(m->notify_event_source, SD_EVENT_PRIORITY_NORMAL-7);
784 if (r < 0)
785 return log_error_errno(r, "Failed to set priority of notify event source: %m");
786
787 (void) sd_event_source_set_description(m->notify_event_source, "manager-notify");
788 }
789
790 return 0;
791 }
792
793 static int manager_setup_cgroups_agent(Manager *m) {
794
795 static const union sockaddr_union sa = {
796 .un.sun_family = AF_UNIX,
797 .un.sun_path = "/run/systemd/cgroups-agent",
798 };
799 int r;
800
801 /* This creates a listening socket we receive cgroups agent messages on. We do not use D-Bus for delivering
802 * these messages from the cgroups agent binary to PID 1, as the cgroups agent binary is very short-living, and
803 * each instance of it needs a new D-Bus connection. Since D-Bus connections are SOCK_STREAM/AF_UNIX, on
804 * overloaded systems the backlog of the D-Bus socket becomes relevant, as not more than the configured number
805 * of D-Bus connections may be queued until the kernel will start dropping further incoming connections,
806 * possibly resulting in lost cgroups agent messages. To avoid this, we'll use a private SOCK_DGRAM/AF_UNIX
807 * socket, where no backlog is relevant as communication may take place without an actual connect() cycle, and
808 * we thus won't lose messages.
809 *
810 * Note that PID 1 will forward the agent message to system bus, so that the user systemd instance may listen
811 * to it. The system instance hence listens on this special socket, but the user instances listen on the system
812 * bus for these messages. */
813
814 if (m->test_run)
815 return 0;
816
817 if (!MANAGER_IS_SYSTEM(m))
818 return 0;
819
820 r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER);
821 if (r < 0)
822 return log_error_errno(r, "Failed to determine whether unified cgroups hierarchy is used: %m");
823 if (r > 0) /* We don't need this anymore on the unified hierarchy */
824 return 0;
825
826 if (m->cgroups_agent_fd < 0) {
827 _cleanup_close_ int fd = -1;
828
829 /* First free all secondary fields */
830 m->cgroups_agent_event_source = sd_event_source_unref(m->cgroups_agent_event_source);
831
832 fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
833 if (fd < 0)
834 return log_error_errno(errno, "Failed to allocate cgroups agent socket: %m");
835
836 fd_inc_rcvbuf(fd, CGROUPS_AGENT_RCVBUF_SIZE);
837
838 (void) unlink(sa.un.sun_path);
839
840 /* Only allow root to connect to this socket */
841 RUN_WITH_UMASK(0077)
842 r = bind(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un));
843 if (r < 0)
844 return log_error_errno(errno, "bind(%s) failed: %m", sa.un.sun_path);
845
846 m->cgroups_agent_fd = fd;
847 fd = -1;
848 }
849
850 if (!m->cgroups_agent_event_source) {
851 r = sd_event_add_io(m->event, &m->cgroups_agent_event_source, m->cgroups_agent_fd, EPOLLIN, manager_dispatch_cgroups_agent_fd, m);
852 if (r < 0)
853 return log_error_errno(r, "Failed to allocate cgroups agent event source: %m");
854
855 /* Process cgroups notifications early, but after having processed service notification messages or
856 * SIGCHLD signals, so that a cgroup running empty is always just the last safety net of notification,
857 * and we collected the metadata the notification and SIGCHLD stuff offers first. Also see handling of
858 * cgroup inotify for the unified cgroup stuff. */
859 r = sd_event_source_set_priority(m->cgroups_agent_event_source, SD_EVENT_PRIORITY_NORMAL-5);
860 if (r < 0)
861 return log_error_errno(r, "Failed to set priority of cgroups agent event source: %m");
862
863 (void) sd_event_source_set_description(m->cgroups_agent_event_source, "manager-cgroups-agent");
864 }
865
866 return 0;
867 }
868
869 static int manager_setup_user_lookup_fd(Manager *m) {
870 int r;
871
872 assert(m);
873
874 /* Set up the socket pair used for passing UID/GID resolution results from forked off processes to PID
875 * 1. Background: we can't do name lookups (NSS) from PID 1, since it might involve IPC and thus activation,
876 * and we might hence deadlock on ourselves. Hence we do all user/group lookups asynchronously from the forked
877 * off processes right before executing the binaries to start. In order to be able to clean up any IPC objects
878 * created by a unit (see RemoveIPC=) we need to know in PID 1 the used UID/GID of the executed processes,
879 * hence we establish this communication channel so that forked off processes can pass their UID/GID
880 * information back to PID 1. The forked off processes send their resolved UID/GID to PID 1 in a simple
881 * datagram, along with their unit name, so that we can share one communication socket pair among all units for
882 * this purpose.
883 *
884 * You might wonder why we need a communication channel for this that is independent of the usual notification
885 * socket scheme (i.e. $NOTIFY_SOCKET). The primary difference is about trust: data sent via the $NOTIFY_SOCKET
886 * channel is only accepted if it originates from the right unit and if reception was enabled for it. The user
887 * lookup socket OTOH is only accessible by PID 1 and its children until they exec(), and always available.
888 *
889 * Note that this function is called under two circumstances: when we first initialize (in which case we
890 * allocate both the socket pair and the event source to listen on it), and when we deserialize after a reload
891 * (in which case the socket pair already exists but we still need to allocate the event source for it). */
892
893 if (m->user_lookup_fds[0] < 0) {
894
895 /* Free all secondary fields */
896 safe_close_pair(m->user_lookup_fds);
897 m->user_lookup_event_source = sd_event_source_unref(m->user_lookup_event_source);
898
899 if (socketpair(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, m->user_lookup_fds) < 0)
900 return log_error_errno(errno, "Failed to allocate user lookup socket: %m");
901
902 (void) fd_inc_rcvbuf(m->user_lookup_fds[0], NOTIFY_RCVBUF_SIZE);
903 }
904
905 if (!m->user_lookup_event_source) {
906 r = sd_event_add_io(m->event, &m->user_lookup_event_source, m->user_lookup_fds[0], EPOLLIN, manager_dispatch_user_lookup_fd, m);
907 if (r < 0)
908 return log_error_errno(errno, "Failed to allocate user lookup event source: %m");
909
910 /* Process even earlier than the notify event source, so that we always know first about valid UID/GID
911 * resolutions */
912 r = sd_event_source_set_priority(m->user_lookup_event_source, SD_EVENT_PRIORITY_NORMAL-8);
913 if (r < 0)
914 return log_error_errno(errno, "Failed to set priority ot user lookup event source: %m");
915
916 (void) sd_event_source_set_description(m->user_lookup_event_source, "user-lookup");
917 }
918
919 return 0;
920 }
921
922 static int manager_connect_bus(Manager *m, bool reexecuting) {
923 bool try_bus_connect;
924
925 assert(m);
926
927 if (m->test_run)
928 return 0;
929
930 try_bus_connect =
931 reexecuting ||
932 (MANAGER_IS_USER(m) && getenv("DBUS_SESSION_BUS_ADDRESS"));
933
934 /* Try to connect to the buses, if possible. */
935 return bus_init(m, try_bus_connect);
936 }
937
938 static unsigned manager_dispatch_cleanup_queue(Manager *m) {
939 Unit *u;
940 unsigned n = 0;
941
942 assert(m);
943
944 while ((u = m->cleanup_queue)) {
945 assert(u->in_cleanup_queue);
946
947 unit_free(u);
948 n++;
949 }
950
951 return n;
952 }
953
954 enum {
955 GC_OFFSET_IN_PATH, /* This one is on the path we were traveling */
956 GC_OFFSET_UNSURE, /* No clue */
957 GC_OFFSET_GOOD, /* We still need this unit */
958 GC_OFFSET_BAD, /* We don't need this unit anymore */
959 _GC_OFFSET_MAX
960 };
961
962 static void unit_gc_mark_good(Unit *u, unsigned gc_marker) {
963 Iterator i;
964 Unit *other;
965
966 u->gc_marker = gc_marker + GC_OFFSET_GOOD;
967
968 /* Recursively mark referenced units as GOOD as well */
969 SET_FOREACH(other, u->dependencies[UNIT_REFERENCES], i)
970 if (other->gc_marker == gc_marker + GC_OFFSET_UNSURE)
971 unit_gc_mark_good(other, gc_marker);
972 }
973
974 static void unit_gc_sweep(Unit *u, unsigned gc_marker) {
975 Iterator i;
976 Unit *other;
977 bool is_bad;
978
979 assert(u);
980
981 if (u->gc_marker == gc_marker + GC_OFFSET_GOOD ||
982 u->gc_marker == gc_marker + GC_OFFSET_BAD ||
983 u->gc_marker == gc_marker + GC_OFFSET_UNSURE ||
984 u->gc_marker == gc_marker + GC_OFFSET_IN_PATH)
985 return;
986
987 if (u->in_cleanup_queue)
988 goto bad;
989
990 if (unit_check_gc(u))
991 goto good;
992
993 u->gc_marker = gc_marker + GC_OFFSET_IN_PATH;
994
995 is_bad = true;
996
997 SET_FOREACH(other, u->dependencies[UNIT_REFERENCED_BY], i) {
998 unit_gc_sweep(other, gc_marker);
999
1000 if (other->gc_marker == gc_marker + GC_OFFSET_GOOD)
1001 goto good;
1002
1003 if (other->gc_marker != gc_marker + GC_OFFSET_BAD)
1004 is_bad = false;
1005 }
1006
1007 if (is_bad)
1008 goto bad;
1009
1010 /* We were unable to find anything out about this entry, so
1011 * let's investigate it later */
1012 u->gc_marker = gc_marker + GC_OFFSET_UNSURE;
1013 unit_add_to_gc_queue(u);
1014 return;
1015
1016 bad:
1017 /* We definitely know that this one is not useful anymore, so
1018 * let's mark it for deletion */
1019 u->gc_marker = gc_marker + GC_OFFSET_BAD;
1020 unit_add_to_cleanup_queue(u);
1021 return;
1022
1023 good:
1024 unit_gc_mark_good(u, gc_marker);
1025 }
1026
1027 static unsigned manager_dispatch_gc_unit_queue(Manager *m) {
1028 unsigned n = 0, gc_marker;
1029 Unit *u;
1030
1031 assert(m);
1032
1033 /* log_debug("Running GC..."); */
1034
1035 m->gc_marker += _GC_OFFSET_MAX;
1036 if (m->gc_marker + _GC_OFFSET_MAX <= _GC_OFFSET_MAX)
1037 m->gc_marker = 1;
1038
1039 gc_marker = m->gc_marker;
1040
1041 while ((u = m->gc_unit_queue)) {
1042 assert(u->in_gc_queue);
1043
1044 unit_gc_sweep(u, gc_marker);
1045
1046 LIST_REMOVE(gc_queue, m->gc_unit_queue, u);
1047 u->in_gc_queue = false;
1048
1049 n++;
1050
1051 if (u->gc_marker == gc_marker + GC_OFFSET_BAD ||
1052 u->gc_marker == gc_marker + GC_OFFSET_UNSURE) {
1053 if (u->id)
1054 log_unit_debug(u, "Collecting.");
1055 u->gc_marker = gc_marker + GC_OFFSET_BAD;
1056 unit_add_to_cleanup_queue(u);
1057 }
1058 }
1059
1060 return n;
1061 }
1062
1063 static unsigned manager_dispatch_gc_job_queue(Manager *m) {
1064 unsigned n = 0;
1065 Job *j;
1066
1067 assert(m);
1068
1069 while ((j = m->gc_job_queue)) {
1070 assert(j->in_gc_queue);
1071
1072 LIST_REMOVE(gc_queue, m->gc_job_queue, j);
1073 j->in_gc_queue = false;
1074
1075 n++;
1076
1077 if (job_check_gc(j))
1078 continue;
1079
1080 log_unit_debug(j->unit, "Collecting job.");
1081 (void) job_finish_and_invalidate(j, JOB_COLLECTED, false, false);
1082 }
1083
1084 return n;
1085 }
1086
1087 static void manager_clear_jobs_and_units(Manager *m) {
1088 Unit *u;
1089
1090 assert(m);
1091
1092 while ((u = hashmap_first(m->units)))
1093 unit_free(u);
1094
1095 manager_dispatch_cleanup_queue(m);
1096
1097 assert(!m->load_queue);
1098 assert(!m->run_queue);
1099 assert(!m->dbus_unit_queue);
1100 assert(!m->dbus_job_queue);
1101 assert(!m->cleanup_queue);
1102 assert(!m->gc_unit_queue);
1103 assert(!m->gc_job_queue);
1104
1105 assert(hashmap_isempty(m->jobs));
1106 assert(hashmap_isempty(m->units));
1107
1108 m->n_on_console = 0;
1109 m->n_running_jobs = 0;
1110 }
1111
1112 Manager* manager_free(Manager *m) {
1113 UnitType c;
1114 int i;
1115 ExecDirectoryType dt;
1116
1117 if (!m)
1118 return NULL;
1119
1120 manager_clear_jobs_and_units(m);
1121
1122 for (c = 0; c < _UNIT_TYPE_MAX; c++)
1123 if (unit_vtable[c]->shutdown)
1124 unit_vtable[c]->shutdown(m);
1125
1126 /* If we reexecute ourselves, we keep the root cgroup
1127 * around */
1128 manager_shutdown_cgroup(m, m->exit_code != MANAGER_REEXECUTE);
1129
1130 lookup_paths_flush_generator(&m->lookup_paths);
1131
1132 bus_done(m);
1133
1134 dynamic_user_vacuum(m, false);
1135 hashmap_free(m->dynamic_users);
1136
1137 hashmap_free(m->units);
1138 hashmap_free(m->units_by_invocation_id);
1139 hashmap_free(m->jobs);
1140 hashmap_free(m->watch_pids1);
1141 hashmap_free(m->watch_pids2);
1142 hashmap_free(m->watch_bus);
1143
1144 set_free(m->startup_units);
1145 set_free(m->failed_units);
1146
1147 sd_event_source_unref(m->signal_event_source);
1148 sd_event_source_unref(m->notify_event_source);
1149 sd_event_source_unref(m->cgroups_agent_event_source);
1150 sd_event_source_unref(m->time_change_event_source);
1151 sd_event_source_unref(m->jobs_in_progress_event_source);
1152 sd_event_source_unref(m->run_queue_event_source);
1153 sd_event_source_unref(m->user_lookup_event_source);
1154
1155 safe_close(m->signal_fd);
1156 safe_close(m->notify_fd);
1157 safe_close(m->cgroups_agent_fd);
1158 safe_close(m->time_change_fd);
1159 safe_close_pair(m->user_lookup_fds);
1160
1161 manager_close_ask_password(m);
1162
1163 manager_close_idle_pipe(m);
1164
1165 udev_unref(m->udev);
1166 sd_event_unref(m->event);
1167
1168 free(m->notify_socket);
1169
1170 lookup_paths_free(&m->lookup_paths);
1171 strv_free(m->environment);
1172
1173 hashmap_free(m->cgroup_unit);
1174 set_free_free(m->unit_path_cache);
1175
1176 free(m->switch_root);
1177 free(m->switch_root_init);
1178
1179 for (i = 0; i < _RLIMIT_MAX; i++)
1180 m->rlimit[i] = mfree(m->rlimit[i]);
1181
1182 assert(hashmap_isempty(m->units_requiring_mounts_for));
1183 hashmap_free(m->units_requiring_mounts_for);
1184
1185 hashmap_free(m->uid_refs);
1186 hashmap_free(m->gid_refs);
1187
1188 for (dt = 0; dt < _EXEC_DIRECTORY_MAX; dt++)
1189 m->prefix[dt] = mfree(m->prefix[dt]);
1190
1191 return mfree(m);
1192 }
1193
1194 void manager_enumerate(Manager *m) {
1195 UnitType c;
1196
1197 assert(m);
1198
1199 /* Let's ask every type to load all units from disk/kernel
1200 * that it might know */
1201 for (c = 0; c < _UNIT_TYPE_MAX; c++) {
1202 if (!unit_type_supported(c)) {
1203 log_debug("Unit type .%s is not supported on this system.", unit_type_to_string(c));
1204 continue;
1205 }
1206
1207 if (!unit_vtable[c]->enumerate)
1208 continue;
1209
1210 unit_vtable[c]->enumerate(m);
1211 }
1212
1213 manager_dispatch_load_queue(m);
1214 }
1215
1216 static void manager_coldplug(Manager *m) {
1217 Iterator i;
1218 Unit *u;
1219 char *k;
1220 int r;
1221
1222 assert(m);
1223
1224 /* Then, let's set up their initial state. */
1225 HASHMAP_FOREACH_KEY(u, k, m->units, i) {
1226
1227 /* ignore aliases */
1228 if (u->id != k)
1229 continue;
1230
1231 r = unit_coldplug(u);
1232 if (r < 0)
1233 log_warning_errno(r, "We couldn't coldplug %s, proceeding anyway: %m", u->id);
1234 }
1235 }
1236
1237 static void manager_build_unit_path_cache(Manager *m) {
1238 char **i;
1239 int r;
1240
1241 assert(m);
1242
1243 set_free_free(m->unit_path_cache);
1244
1245 m->unit_path_cache = set_new(&string_hash_ops);
1246 if (!m->unit_path_cache) {
1247 r = -ENOMEM;
1248 goto fail;
1249 }
1250
1251 /* This simply builds a list of files we know exist, so that
1252 * we don't always have to go to disk */
1253
1254 STRV_FOREACH(i, m->lookup_paths.search_path) {
1255 _cleanup_closedir_ DIR *d = NULL;
1256 struct dirent *de;
1257
1258 d = opendir(*i);
1259 if (!d) {
1260 if (errno != ENOENT)
1261 log_warning_errno(errno, "Failed to open directory %s, ignoring: %m", *i);
1262 continue;
1263 }
1264
1265 FOREACH_DIRENT(de, d, r = -errno; goto fail) {
1266 char *p;
1267
1268 p = strjoin(streq(*i, "/") ? "" : *i, "/", de->d_name);
1269 if (!p) {
1270 r = -ENOMEM;
1271 goto fail;
1272 }
1273
1274 r = set_consume(m->unit_path_cache, p);
1275 if (r < 0)
1276 goto fail;
1277 }
1278 }
1279
1280 return;
1281
1282 fail:
1283 log_warning_errno(r, "Failed to build unit path cache, proceeding without: %m");
1284 m->unit_path_cache = set_free_free(m->unit_path_cache);
1285 }
1286
1287 static void manager_distribute_fds(Manager *m, FDSet *fds) {
1288 Iterator i;
1289 Unit *u;
1290
1291 assert(m);
1292
1293 HASHMAP_FOREACH(u, m->units, i) {
1294
1295 if (fdset_size(fds) <= 0)
1296 break;
1297
1298 if (!UNIT_VTABLE(u)->distribute_fds)
1299 continue;
1300
1301 UNIT_VTABLE(u)->distribute_fds(u, fds);
1302 }
1303 }
1304
1305 int manager_startup(Manager *m, FILE *serialization, FDSet *fds) {
1306 int r, q;
1307
1308 assert(m);
1309
1310 r = lookup_paths_init(&m->lookup_paths, m->unit_file_scope, 0, NULL);
1311 if (r < 0)
1312 return r;
1313
1314 r = manager_run_environment_generators(m);
1315 if (r < 0)
1316 return r;
1317
1318 /* Make sure the transient directory always exists, so that it remains in the search path */
1319 if (!m->test_run) {
1320 r = mkdir_p_label(m->lookup_paths.transient, 0755);
1321 if (r < 0)
1322 return r;
1323 }
1324
1325 dual_timestamp_get(&m->generators_start_timestamp);
1326 r = manager_run_generators(m);
1327 dual_timestamp_get(&m->generators_finish_timestamp);
1328 if (r < 0)
1329 return r;
1330
1331 if (m->first_boot && m->unit_file_scope == UNIT_FILE_SYSTEM) {
1332 q = unit_file_preset_all(UNIT_FILE_SYSTEM, 0, NULL, UNIT_FILE_PRESET_ENABLE_ONLY, NULL, 0);
1333 if (q < 0)
1334 log_full_errno(q == -EEXIST ? LOG_NOTICE : LOG_WARNING, q, "Failed to populate /etc with preset unit settings, ignoring: %m");
1335 else
1336 log_info("Populated /etc with preset unit settings.");
1337 }
1338
1339 lookup_paths_reduce(&m->lookup_paths);
1340 manager_build_unit_path_cache(m);
1341
1342 /* If we will deserialize make sure that during enumeration
1343 * this is already known, so we increase the counter here
1344 * already */
1345 if (serialization)
1346 m->n_reloading++;
1347
1348 /* First, enumerate what we can from all config files */
1349 dual_timestamp_get(&m->units_load_start_timestamp);
1350 manager_enumerate(m);
1351 dual_timestamp_get(&m->units_load_finish_timestamp);
1352
1353 /* Second, deserialize if there is something to deserialize */
1354 if (serialization) {
1355 r = manager_deserialize(m, serialization, fds);
1356 if (r < 0)
1357 log_error_errno(r, "Deserialization failed: %m");
1358 }
1359
1360 /* Any fds left? Find some unit which wants them. This is
1361 * useful to allow container managers to pass some file
1362 * descriptors to us pre-initialized. This enables
1363 * socket-based activation of entire containers. */
1364 manager_distribute_fds(m, fds);
1365
1366 /* We might have deserialized the notify fd, but if we didn't
1367 * then let's create the bus now */
1368 q = manager_setup_notify(m);
1369 if (q < 0 && r == 0)
1370 r = q;
1371
1372 q = manager_setup_cgroups_agent(m);
1373 if (q < 0 && r == 0)
1374 r = q;
1375
1376 q = manager_setup_user_lookup_fd(m);
1377 if (q < 0 && r == 0)
1378 r = q;
1379
1380 /* Let's connect to the bus now. */
1381 (void) manager_connect_bus(m, !!serialization);
1382
1383 (void) bus_track_coldplug(m, &m->subscribed, false, m->deserialized_subscribed);
1384 m->deserialized_subscribed = strv_free(m->deserialized_subscribed);
1385
1386 /* Third, fire things up! */
1387 manager_coldplug(m);
1388
1389 /* Release any dynamic users no longer referenced */
1390 dynamic_user_vacuum(m, true);
1391
1392 /* Release any references to UIDs/GIDs no longer referenced, and destroy any IPC owned by them */
1393 manager_vacuum_uid_refs(m);
1394 manager_vacuum_gid_refs(m);
1395
1396 if (serialization) {
1397 assert(m->n_reloading > 0);
1398 m->n_reloading--;
1399
1400 /* Let's wait for the UnitNew/JobNew messages being
1401 * sent, before we notify that the reload is
1402 * finished */
1403 m->send_reloading_done = true;
1404 }
1405
1406 return r;
1407 }
1408
1409 int manager_add_job(Manager *m, JobType type, Unit *unit, JobMode mode, sd_bus_error *e, Job **_ret) {
1410 int r;
1411 Transaction *tr;
1412
1413 assert(m);
1414 assert(type < _JOB_TYPE_MAX);
1415 assert(unit);
1416 assert(mode < _JOB_MODE_MAX);
1417
1418 if (mode == JOB_ISOLATE && type != JOB_START)
1419 return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Isolate is only valid for start.");
1420
1421 if (mode == JOB_ISOLATE && !unit->allow_isolate)
1422 return sd_bus_error_setf(e, BUS_ERROR_NO_ISOLATION, "Operation refused, unit may not be isolated.");
1423
1424 log_unit_debug(unit, "Trying to enqueue job %s/%s/%s", unit->id, job_type_to_string(type), job_mode_to_string(mode));
1425
1426 type = job_type_collapse(type, unit);
1427
1428 tr = transaction_new(mode == JOB_REPLACE_IRREVERSIBLY);
1429 if (!tr)
1430 return -ENOMEM;
1431
1432 r = transaction_add_job_and_dependencies(tr, type, unit, NULL, true, false,
1433 mode == JOB_IGNORE_DEPENDENCIES || mode == JOB_IGNORE_REQUIREMENTS,
1434 mode == JOB_IGNORE_DEPENDENCIES, e);
1435 if (r < 0)
1436 goto tr_abort;
1437
1438 if (mode == JOB_ISOLATE) {
1439 r = transaction_add_isolate_jobs(tr, m);
1440 if (r < 0)
1441 goto tr_abort;
1442 }
1443
1444 r = transaction_activate(tr, m, mode, e);
1445 if (r < 0)
1446 goto tr_abort;
1447
1448 log_unit_debug(unit,
1449 "Enqueued job %s/%s as %u", unit->id,
1450 job_type_to_string(type), (unsigned) tr->anchor_job->id);
1451
1452 if (_ret)
1453 *_ret = tr->anchor_job;
1454
1455 transaction_free(tr);
1456 return 0;
1457
1458 tr_abort:
1459 transaction_abort(tr);
1460 transaction_free(tr);
1461 return r;
1462 }
1463
1464 int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, sd_bus_error *e, Job **ret) {
1465 Unit *unit = NULL; /* just to appease gcc, initialization is not really necessary */
1466 int r;
1467
1468 assert(m);
1469 assert(type < _JOB_TYPE_MAX);
1470 assert(name);
1471 assert(mode < _JOB_MODE_MAX);
1472
1473 r = manager_load_unit(m, name, NULL, NULL, &unit);
1474 if (r < 0)
1475 return r;
1476 assert(unit);
1477
1478 return manager_add_job(m, type, unit, mode, e, ret);
1479 }
1480
1481 int manager_add_job_by_name_and_warn(Manager *m, JobType type, const char *name, JobMode mode, Job **ret) {
1482 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
1483 int r;
1484
1485 assert(m);
1486 assert(type < _JOB_TYPE_MAX);
1487 assert(name);
1488 assert(mode < _JOB_MODE_MAX);
1489
1490 r = manager_add_job_by_name(m, type, name, mode, &error, ret);
1491 if (r < 0)
1492 return log_warning_errno(r, "Failed to enqueue %s job for %s: %s", job_mode_to_string(mode), name, bus_error_message(&error, r));
1493
1494 return r;
1495 }
1496
1497 Job *manager_get_job(Manager *m, uint32_t id) {
1498 assert(m);
1499
1500 return hashmap_get(m->jobs, UINT32_TO_PTR(id));
1501 }
1502
1503 Unit *manager_get_unit(Manager *m, const char *name) {
1504 assert(m);
1505 assert(name);
1506
1507 return hashmap_get(m->units, name);
1508 }
1509
1510 unsigned manager_dispatch_load_queue(Manager *m) {
1511 Unit *u;
1512 unsigned n = 0;
1513
1514 assert(m);
1515
1516 /* Make sure we are not run recursively */
1517 if (m->dispatching_load_queue)
1518 return 0;
1519
1520 m->dispatching_load_queue = true;
1521
1522 /* Dispatches the load queue. Takes a unit from the queue and
1523 * tries to load its data until the queue is empty */
1524
1525 while ((u = m->load_queue)) {
1526 assert(u->in_load_queue);
1527
1528 unit_load(u);
1529 n++;
1530 }
1531
1532 m->dispatching_load_queue = false;
1533 return n;
1534 }
1535
1536 int manager_load_unit_prepare(
1537 Manager *m,
1538 const char *name,
1539 const char *path,
1540 sd_bus_error *e,
1541 Unit **_ret) {
1542
1543 Unit *ret;
1544 UnitType t;
1545 int r;
1546
1547 assert(m);
1548 assert(name || path);
1549 assert(_ret);
1550
1551 /* This will prepare the unit for loading, but not actually
1552 * load anything from disk. */
1553
1554 if (path && !is_path(path))
1555 return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Path %s is not absolute.", path);
1556
1557 if (!name)
1558 name = basename(path);
1559
1560 t = unit_name_to_type(name);
1561
1562 if (t == _UNIT_TYPE_INVALID || !unit_name_is_valid(name, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) {
1563 if (unit_name_is_valid(name, UNIT_NAME_TEMPLATE))
1564 return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Unit name %s is missing the instance name.", name);
1565
1566 return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Unit name %s is not valid.", name);
1567 }
1568
1569 ret = manager_get_unit(m, name);
1570 if (ret) {
1571 *_ret = ret;
1572 return 1;
1573 }
1574
1575 ret = unit_new(m, unit_vtable[t]->object_size);
1576 if (!ret)
1577 return -ENOMEM;
1578
1579 if (path) {
1580 ret->fragment_path = strdup(path);
1581 if (!ret->fragment_path) {
1582 unit_free(ret);
1583 return -ENOMEM;
1584 }
1585 }
1586
1587 r = unit_add_name(ret, name);
1588 if (r < 0) {
1589 unit_free(ret);
1590 return r;
1591 }
1592
1593 unit_add_to_load_queue(ret);
1594 unit_add_to_dbus_queue(ret);
1595 unit_add_to_gc_queue(ret);
1596
1597 *_ret = ret;
1598
1599 return 0;
1600 }
1601
1602 int manager_load_unit(
1603 Manager *m,
1604 const char *name,
1605 const char *path,
1606 sd_bus_error *e,
1607 Unit **_ret) {
1608
1609 int r;
1610
1611 assert(m);
1612 assert(_ret);
1613
1614 /* This will load the service information files, but not actually
1615 * start any services or anything. */
1616
1617 r = manager_load_unit_prepare(m, name, path, e, _ret);
1618 if (r != 0)
1619 return r;
1620
1621 manager_dispatch_load_queue(m);
1622
1623 *_ret = unit_follow_merge(*_ret);
1624
1625 return 0;
1626 }
1627
1628 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
1629 Iterator i;
1630 Job *j;
1631
1632 assert(s);
1633 assert(f);
1634
1635 HASHMAP_FOREACH(j, s->jobs, i)
1636 job_dump(j, f, prefix);
1637 }
1638
1639 void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
1640 Iterator i;
1641 Unit *u;
1642 const char *t;
1643
1644 assert(s);
1645 assert(f);
1646
1647 HASHMAP_FOREACH_KEY(u, t, s->units, i)
1648 if (u->id == t)
1649 unit_dump(u, f, prefix);
1650 }
1651
1652 void manager_clear_jobs(Manager *m) {
1653 Job *j;
1654
1655 assert(m);
1656
1657 while ((j = hashmap_first(m->jobs)))
1658 /* No need to recurse. We're cancelling all jobs. */
1659 job_finish_and_invalidate(j, JOB_CANCELED, false, false);
1660 }
1661
1662 static int manager_dispatch_run_queue(sd_event_source *source, void *userdata) {
1663 Manager *m = userdata;
1664 Job *j;
1665
1666 assert(source);
1667 assert(m);
1668
1669 while ((j = m->run_queue)) {
1670 assert(j->installed);
1671 assert(j->in_run_queue);
1672
1673 job_run_and_invalidate(j);
1674 }
1675
1676 if (m->n_running_jobs > 0)
1677 manager_watch_jobs_in_progress(m);
1678
1679 if (m->n_on_console > 0)
1680 manager_watch_idle_pipe(m);
1681
1682 return 1;
1683 }
1684
1685 static unsigned manager_dispatch_dbus_queue(Manager *m) {
1686 Job *j;
1687 Unit *u;
1688 unsigned n = 0;
1689
1690 assert(m);
1691
1692 if (m->dispatching_dbus_queue)
1693 return 0;
1694
1695 m->dispatching_dbus_queue = true;
1696
1697 while ((u = m->dbus_unit_queue)) {
1698 assert(u->in_dbus_queue);
1699
1700 bus_unit_send_change_signal(u);
1701 n++;
1702 }
1703
1704 while ((j = m->dbus_job_queue)) {
1705 assert(j->in_dbus_queue);
1706
1707 bus_job_send_change_signal(j);
1708 n++;
1709 }
1710
1711 m->dispatching_dbus_queue = false;
1712
1713 if (m->send_reloading_done) {
1714 m->send_reloading_done = false;
1715
1716 bus_manager_send_reloading(m, false);
1717 }
1718
1719 if (m->queued_message)
1720 bus_send_queued_message(m);
1721
1722 return n;
1723 }
1724
1725 static int manager_dispatch_cgroups_agent_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
1726 Manager *m = userdata;
1727 char buf[PATH_MAX+1];
1728 ssize_t n;
1729
1730 n = recv(fd, buf, sizeof(buf), 0);
1731 if (n < 0)
1732 return log_error_errno(errno, "Failed to read cgroups agent message: %m");
1733 if (n == 0) {
1734 log_error("Got zero-length cgroups agent message, ignoring.");
1735 return 0;
1736 }
1737 if ((size_t) n >= sizeof(buf)) {
1738 log_error("Got overly long cgroups agent message, ignoring.");
1739 return 0;
1740 }
1741
1742 if (memchr(buf, 0, n)) {
1743 log_error("Got cgroups agent message with embedded NUL byte, ignoring.");
1744 return 0;
1745 }
1746 buf[n] = 0;
1747
1748 manager_notify_cgroup_empty(m, buf);
1749 bus_forward_agent_released(m, buf);
1750
1751 return 0;
1752 }
1753
1754 static void manager_invoke_notify_message(Manager *m, Unit *u, pid_t pid, const char *buf, FDSet *fds) {
1755 _cleanup_strv_free_ char **tags = NULL;
1756
1757 assert(m);
1758 assert(u);
1759 assert(buf);
1760
1761 tags = strv_split(buf, "\n\r");
1762 if (!tags) {
1763 log_oom();
1764 return;
1765 }
1766
1767 if (UNIT_VTABLE(u)->notify_message)
1768 UNIT_VTABLE(u)->notify_message(u, pid, tags, fds);
1769 else if (_unlikely_(log_get_max_level() >= LOG_DEBUG)) {
1770 _cleanup_free_ char *x = NULL, *y = NULL;
1771
1772 x = cescape(buf);
1773 if (x)
1774 y = ellipsize(x, 20, 90);
1775 log_unit_debug(u, "Got notification message \"%s\", ignoring.", strnull(y));
1776 }
1777 }
1778
1779 static int manager_dispatch_notify_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
1780
1781 _cleanup_fdset_free_ FDSet *fds = NULL;
1782 Manager *m = userdata;
1783 char buf[NOTIFY_BUFFER_MAX+1];
1784 struct iovec iovec = {
1785 .iov_base = buf,
1786 .iov_len = sizeof(buf)-1,
1787 };
1788 union {
1789 struct cmsghdr cmsghdr;
1790 uint8_t buf[CMSG_SPACE(sizeof(struct ucred)) +
1791 CMSG_SPACE(sizeof(int) * NOTIFY_FD_MAX)];
1792 } control = {};
1793 struct msghdr msghdr = {
1794 .msg_iov = &iovec,
1795 .msg_iovlen = 1,
1796 .msg_control = &control,
1797 .msg_controllen = sizeof(control),
1798 };
1799
1800 struct cmsghdr *cmsg;
1801 struct ucred *ucred = NULL;
1802 Unit *u1, *u2, *u3;
1803 int r, *fd_array = NULL;
1804 unsigned n_fds = 0;
1805 ssize_t n;
1806
1807 assert(m);
1808 assert(m->notify_fd == fd);
1809
1810 if (revents != EPOLLIN) {
1811 log_warning("Got unexpected poll event for notify fd.");
1812 return 0;
1813 }
1814
1815 n = recvmsg(m->notify_fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC|MSG_TRUNC);
1816 if (n < 0) {
1817 if (IN_SET(errno, EAGAIN, EINTR))
1818 return 0; /* Spurious wakeup, try again */
1819
1820 /* If this is any other, real error, then let's stop processing this socket. This of course means we
1821 * won't take notification messages anymore, but that's still better than busy looping around this:
1822 * being woken up over and over again but being unable to actually read the message off the socket. */
1823 return log_error_errno(errno, "Failed to receive notification message: %m");
1824 }
1825
1826 CMSG_FOREACH(cmsg, &msghdr) {
1827 if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) {
1828
1829 fd_array = (int*) CMSG_DATA(cmsg);
1830 n_fds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int);
1831
1832 } else if (cmsg->cmsg_level == SOL_SOCKET &&
1833 cmsg->cmsg_type == SCM_CREDENTIALS &&
1834 cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) {
1835
1836 ucred = (struct ucred*) CMSG_DATA(cmsg);
1837 }
1838 }
1839
1840 if (n_fds > 0) {
1841 assert(fd_array);
1842
1843 r = fdset_new_array(&fds, fd_array, n_fds);
1844 if (r < 0) {
1845 close_many(fd_array, n_fds);
1846 log_oom();
1847 return 0;
1848 }
1849 }
1850
1851 if (!ucred || ucred->pid <= 0) {
1852 log_warning("Received notify message without valid credentials. Ignoring.");
1853 return 0;
1854 }
1855
1856 if ((size_t) n >= sizeof(buf) || (msghdr.msg_flags & MSG_TRUNC)) {
1857 log_warning("Received notify message exceeded maximum size. Ignoring.");
1858 return 0;
1859 }
1860
1861 /* As extra safety check, let's make sure the string we get doesn't contain embedded NUL bytes. We permit one
1862 * trailing NUL byte in the message, but don't expect it. */
1863 if (n > 1 && memchr(buf, 0, n-1)) {
1864 log_warning("Received notify message with embedded NUL bytes. Ignoring.");
1865 return 0;
1866 }
1867
1868 /* Make sure it's NUL-terminated. */
1869 buf[n] = 0;
1870
1871 /* Notify every unit that might be interested, but try
1872 * to avoid notifying the same one multiple times. */
1873 u1 = manager_get_unit_by_pid_cgroup(m, ucred->pid);
1874 if (u1)
1875 manager_invoke_notify_message(m, u1, ucred->pid, buf, fds);
1876
1877 u2 = hashmap_get(m->watch_pids1, PID_TO_PTR(ucred->pid));
1878 if (u2 && u2 != u1)
1879 manager_invoke_notify_message(m, u2, ucred->pid, buf, fds);
1880
1881 u3 = hashmap_get(m->watch_pids2, PID_TO_PTR(ucred->pid));
1882 if (u3 && u3 != u2 && u3 != u1)
1883 manager_invoke_notify_message(m, u3, ucred->pid, buf, fds);
1884
1885 if (!u1 && !u2 && !u3)
1886 log_warning("Cannot find unit for notify message of PID "PID_FMT".", ucred->pid);
1887
1888 if (fdset_size(fds) > 0)
1889 log_warning("Got extra auxiliary fds with notification message, closing them.");
1890
1891 return 0;
1892 }
1893
1894 static void invoke_sigchld_event(Manager *m, Unit *u, const siginfo_t *si) {
1895 uint64_t iteration;
1896
1897 assert(m);
1898 assert(u);
1899 assert(si);
1900
1901 sd_event_get_iteration(m->event, &iteration);
1902
1903 log_unit_debug(u, "Child "PID_FMT" belongs to %s", si->si_pid, u->id);
1904
1905 unit_unwatch_pid(u, si->si_pid);
1906
1907 if (UNIT_VTABLE(u)->sigchld_event) {
1908 if (set_size(u->pids) <= 1 ||
1909 iteration != u->sigchldgen ||
1910 unit_main_pid(u) == si->si_pid ||
1911 unit_control_pid(u) == si->si_pid) {
1912 UNIT_VTABLE(u)->sigchld_event(u, si->si_pid, si->si_code, si->si_status);
1913 u->sigchldgen = iteration;
1914 } else
1915 log_debug("%s already issued a sigchld this iteration %" PRIu64 ", skipping. Pids still being watched %d", u->id, iteration, set_size(u->pids));
1916 }
1917 }
1918
1919 static int manager_dispatch_sigchld(Manager *m) {
1920 assert(m);
1921
1922 for (;;) {
1923 siginfo_t si = {};
1924
1925 /* First we call waitd() for a PID and do not reap the
1926 * zombie. That way we can still access /proc/$PID for
1927 * it while it is a zombie. */
1928 if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) {
1929
1930 if (errno == ECHILD)
1931 break;
1932
1933 if (errno == EINTR)
1934 continue;
1935
1936 return -errno;
1937 }
1938
1939 if (si.si_pid <= 0)
1940 break;
1941
1942 if (si.si_code == CLD_EXITED || si.si_code == CLD_KILLED || si.si_code == CLD_DUMPED) {
1943 _cleanup_free_ char *name = NULL;
1944 Unit *u1, *u2, *u3;
1945
1946 get_process_comm(si.si_pid, &name);
1947
1948 log_debug("Child "PID_FMT" (%s) died (code=%s, status=%i/%s)",
1949 si.si_pid, strna(name),
1950 sigchld_code_to_string(si.si_code),
1951 si.si_status,
1952 strna(si.si_code == CLD_EXITED
1953 ? exit_status_to_string(si.si_status, EXIT_STATUS_FULL)
1954 : signal_to_string(si.si_status)));
1955
1956 /* And now figure out the unit this belongs
1957 * to, it might be multiple... */
1958 u1 = manager_get_unit_by_pid_cgroup(m, si.si_pid);
1959 if (u1)
1960 invoke_sigchld_event(m, u1, &si);
1961 u2 = hashmap_get(m->watch_pids1, PID_TO_PTR(si.si_pid));
1962 if (u2 && u2 != u1)
1963 invoke_sigchld_event(m, u2, &si);
1964 u3 = hashmap_get(m->watch_pids2, PID_TO_PTR(si.si_pid));
1965 if (u3 && u3 != u2 && u3 != u1)
1966 invoke_sigchld_event(m, u3, &si);
1967 }
1968
1969 /* And now, we actually reap the zombie. */
1970 if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) {
1971 if (errno == EINTR)
1972 continue;
1973
1974 return -errno;
1975 }
1976 }
1977
1978 return 0;
1979 }
1980
1981 static int manager_start_target(Manager *m, const char *name, JobMode mode) {
1982 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
1983 int r;
1984
1985 log_debug("Activating special unit %s", name);
1986
1987 r = manager_add_job_by_name(m, JOB_START, name, mode, &error, NULL);
1988 if (r < 0)
1989 log_error("Failed to enqueue %s job: %s", name, bus_error_message(&error, r));
1990
1991 return r;
1992 }
1993
1994 static void manager_handle_ctrl_alt_del(Manager *m) {
1995 /* If the user presses C-A-D more than
1996 * 7 times within 2s, we reboot/shutdown immediately,
1997 * unless it was disabled in system.conf */
1998
1999 if (ratelimit_test(&m->ctrl_alt_del_ratelimit) || m->cad_burst_action == EMERGENCY_ACTION_NONE)
2000 manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET, JOB_REPLACE_IRREVERSIBLY);
2001 else
2002 emergency_action(m, m->cad_burst_action, NULL,
2003 "Ctrl-Alt-Del was pressed more than 7 times within 2s");
2004 }
2005
2006 static int manager_dispatch_signal_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2007 Manager *m = userdata;
2008 ssize_t n;
2009 struct signalfd_siginfo sfsi;
2010 bool sigchld = false;
2011 int r;
2012
2013 assert(m);
2014 assert(m->signal_fd == fd);
2015
2016 if (revents != EPOLLIN) {
2017 log_warning("Got unexpected events from signal file descriptor.");
2018 return 0;
2019 }
2020
2021 for (;;) {
2022 n = read(m->signal_fd, &sfsi, sizeof(sfsi));
2023 if (n != sizeof(sfsi)) {
2024 if (n >= 0) {
2025 log_warning("Truncated read from signal fd (%zu bytes)!", n);
2026 return 0;
2027 }
2028
2029 if (IN_SET(errno, EINTR, EAGAIN))
2030 break;
2031
2032 /* We return an error here, which will kill this handler,
2033 * to avoid a busy loop on read error. */
2034 return log_error_errno(errno, "Reading from signal fd failed: %m");
2035 }
2036
2037 log_received_signal(sfsi.ssi_signo == SIGCHLD ||
2038 (sfsi.ssi_signo == SIGTERM && MANAGER_IS_USER(m))
2039 ? LOG_DEBUG : LOG_INFO,
2040 &sfsi);
2041
2042 switch (sfsi.ssi_signo) {
2043
2044 case SIGCHLD:
2045 sigchld = true;
2046 break;
2047
2048 case SIGTERM:
2049 if (MANAGER_IS_SYSTEM(m)) {
2050 /* This is for compatibility with the
2051 * original sysvinit */
2052 r = verify_run_space_and_log("Refusing to reexecute");
2053 if (r >= 0)
2054 m->exit_code = MANAGER_REEXECUTE;
2055 break;
2056 }
2057
2058 /* Fall through */
2059
2060 case SIGINT:
2061 if (MANAGER_IS_SYSTEM(m)) {
2062 manager_handle_ctrl_alt_del(m);
2063 break;
2064 }
2065
2066 /* Run the exit target if there is one, if not, just exit. */
2067 if (manager_start_target(m, SPECIAL_EXIT_TARGET, JOB_REPLACE) < 0) {
2068 m->exit_code = MANAGER_EXIT;
2069 return 0;
2070 }
2071
2072 break;
2073
2074 case SIGWINCH:
2075 if (MANAGER_IS_SYSTEM(m))
2076 manager_start_target(m, SPECIAL_KBREQUEST_TARGET, JOB_REPLACE);
2077
2078 /* This is a nop on non-init */
2079 break;
2080
2081 case SIGPWR:
2082 if (MANAGER_IS_SYSTEM(m))
2083 manager_start_target(m, SPECIAL_SIGPWR_TARGET, JOB_REPLACE);
2084
2085 /* This is a nop on non-init */
2086 break;
2087
2088 case SIGUSR1: {
2089 Unit *u;
2090
2091 u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
2092
2093 if (!u || UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u))) {
2094 log_info("Trying to reconnect to bus...");
2095 bus_init(m, true);
2096 }
2097
2098 if (!u || !UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u))) {
2099 log_info("Loading D-Bus service...");
2100 manager_start_target(m, SPECIAL_DBUS_SERVICE, JOB_REPLACE);
2101 }
2102
2103 break;
2104 }
2105
2106 case SIGUSR2: {
2107 _cleanup_free_ char *dump = NULL;
2108 _cleanup_fclose_ FILE *f = NULL;
2109 size_t size;
2110
2111 f = open_memstream(&dump, &size);
2112 if (!f) {
2113 log_warning_errno(errno, "Failed to allocate memory stream: %m");
2114 break;
2115 }
2116
2117 manager_dump_units(m, f, "\t");
2118 manager_dump_jobs(m, f, "\t");
2119
2120 r = fflush_and_check(f);
2121 if (r < 0) {
2122 log_warning_errno(r, "Failed to write status stream: %m");
2123 break;
2124 }
2125
2126 log_dump(LOG_INFO, dump);
2127 break;
2128 }
2129
2130 case SIGHUP:
2131 r = verify_run_space_and_log("Refusing to reload");
2132 if (r >= 0)
2133 m->exit_code = MANAGER_RELOAD;
2134 break;
2135
2136 default: {
2137
2138 /* Starting SIGRTMIN+0 */
2139 static const char * const target_table[] = {
2140 [0] = SPECIAL_DEFAULT_TARGET,
2141 [1] = SPECIAL_RESCUE_TARGET,
2142 [2] = SPECIAL_EMERGENCY_TARGET,
2143 [3] = SPECIAL_HALT_TARGET,
2144 [4] = SPECIAL_POWEROFF_TARGET,
2145 [5] = SPECIAL_REBOOT_TARGET,
2146 [6] = SPECIAL_KEXEC_TARGET
2147 };
2148
2149 /* Starting SIGRTMIN+13, so that target halt and system halt are 10 apart */
2150 static const ManagerExitCode code_table[] = {
2151 [0] = MANAGER_HALT,
2152 [1] = MANAGER_POWEROFF,
2153 [2] = MANAGER_REBOOT,
2154 [3] = MANAGER_KEXEC
2155 };
2156
2157 if ((int) sfsi.ssi_signo >= SIGRTMIN+0 &&
2158 (int) sfsi.ssi_signo < SIGRTMIN+(int) ELEMENTSOF(target_table)) {
2159 int idx = (int) sfsi.ssi_signo - SIGRTMIN;
2160 manager_start_target(m, target_table[idx],
2161 (idx == 1 || idx == 2) ? JOB_ISOLATE : JOB_REPLACE);
2162 break;
2163 }
2164
2165 if ((int) sfsi.ssi_signo >= SIGRTMIN+13 &&
2166 (int) sfsi.ssi_signo < SIGRTMIN+13+(int) ELEMENTSOF(code_table)) {
2167 m->exit_code = code_table[sfsi.ssi_signo - SIGRTMIN - 13];
2168 break;
2169 }
2170
2171 switch (sfsi.ssi_signo - SIGRTMIN) {
2172
2173 case 20:
2174 manager_set_show_status(m, SHOW_STATUS_YES);
2175 break;
2176
2177 case 21:
2178 manager_set_show_status(m, SHOW_STATUS_NO);
2179 break;
2180
2181 case 22:
2182 log_set_max_level(LOG_DEBUG);
2183 log_info("Setting log level to debug.");
2184 break;
2185
2186 case 23:
2187 log_set_max_level(LOG_INFO);
2188 log_info("Setting log level to info.");
2189 break;
2190
2191 case 24:
2192 if (MANAGER_IS_USER(m)) {
2193 m->exit_code = MANAGER_EXIT;
2194 return 0;
2195 }
2196
2197 /* This is a nop on init */
2198 break;
2199
2200 case 26:
2201 case 29: /* compatibility: used to be mapped to LOG_TARGET_SYSLOG_OR_KMSG */
2202 log_set_target(LOG_TARGET_JOURNAL_OR_KMSG);
2203 log_notice("Setting log target to journal-or-kmsg.");
2204 break;
2205
2206 case 27:
2207 log_set_target(LOG_TARGET_CONSOLE);
2208 log_notice("Setting log target to console.");
2209 break;
2210
2211 case 28:
2212 log_set_target(LOG_TARGET_KMSG);
2213 log_notice("Setting log target to kmsg.");
2214 break;
2215
2216 default:
2217 log_warning("Got unhandled signal <%s>.", signal_to_string(sfsi.ssi_signo));
2218 }
2219 }
2220 }
2221 }
2222
2223 if (sigchld)
2224 manager_dispatch_sigchld(m);
2225
2226 return 0;
2227 }
2228
2229 static int manager_dispatch_time_change_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2230 Manager *m = userdata;
2231 Iterator i;
2232 Unit *u;
2233
2234 assert(m);
2235 assert(m->time_change_fd == fd);
2236
2237 log_struct(LOG_DEBUG,
2238 "MESSAGE_ID=" SD_MESSAGE_TIME_CHANGE_STR,
2239 LOG_MESSAGE("Time has been changed"),
2240 NULL);
2241
2242 /* Restart the watch */
2243 m->time_change_event_source = sd_event_source_unref(m->time_change_event_source);
2244 m->time_change_fd = safe_close(m->time_change_fd);
2245
2246 manager_setup_time_change(m);
2247
2248 HASHMAP_FOREACH(u, m->units, i)
2249 if (UNIT_VTABLE(u)->time_change)
2250 UNIT_VTABLE(u)->time_change(u);
2251
2252 return 0;
2253 }
2254
2255 static int manager_dispatch_idle_pipe_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2256 Manager *m = userdata;
2257
2258 assert(m);
2259 assert(m->idle_pipe[2] == fd);
2260
2261 m->no_console_output = m->n_on_console > 0;
2262
2263 manager_close_idle_pipe(m);
2264
2265 return 0;
2266 }
2267
2268 static int manager_dispatch_jobs_in_progress(sd_event_source *source, usec_t usec, void *userdata) {
2269 Manager *m = userdata;
2270 int r;
2271 uint64_t next;
2272
2273 assert(m);
2274 assert(source);
2275
2276 manager_print_jobs_in_progress(m);
2277
2278 next = now(CLOCK_MONOTONIC) + JOBS_IN_PROGRESS_PERIOD_USEC;
2279 r = sd_event_source_set_time(source, next);
2280 if (r < 0)
2281 return r;
2282
2283 return sd_event_source_set_enabled(source, SD_EVENT_ONESHOT);
2284 }
2285
2286 int manager_loop(Manager *m) {
2287 int r;
2288
2289 RATELIMIT_DEFINE(rl, 1*USEC_PER_SEC, 50000);
2290
2291 assert(m);
2292 m->exit_code = MANAGER_OK;
2293
2294 /* Release the path cache */
2295 m->unit_path_cache = set_free_free(m->unit_path_cache);
2296
2297 manager_check_finished(m);
2298
2299 /* There might still be some zombies hanging around from
2300 * before we were exec()'ed. Let's reap them. */
2301 r = manager_dispatch_sigchld(m);
2302 if (r < 0)
2303 return r;
2304
2305 while (m->exit_code == MANAGER_OK) {
2306 usec_t wait_usec;
2307
2308 if (m->runtime_watchdog > 0 && m->runtime_watchdog != USEC_INFINITY && MANAGER_IS_SYSTEM(m))
2309 watchdog_ping();
2310
2311 if (!ratelimit_test(&rl)) {
2312 /* Yay, something is going seriously wrong, pause a little */
2313 log_warning("Looping too fast. Throttling execution a little.");
2314 sleep(1);
2315 }
2316
2317 if (manager_dispatch_load_queue(m) > 0)
2318 continue;
2319
2320 if (manager_dispatch_gc_job_queue(m) > 0)
2321 continue;
2322
2323 if (manager_dispatch_gc_unit_queue(m) > 0)
2324 continue;
2325
2326 if (manager_dispatch_cleanup_queue(m) > 0)
2327 continue;
2328
2329 if (manager_dispatch_cgroup_queue(m) > 0)
2330 continue;
2331
2332 if (manager_dispatch_dbus_queue(m) > 0)
2333 continue;
2334
2335 /* Sleep for half the watchdog time */
2336 if (m->runtime_watchdog > 0 && m->runtime_watchdog != USEC_INFINITY && MANAGER_IS_SYSTEM(m)) {
2337 wait_usec = m->runtime_watchdog / 2;
2338 if (wait_usec <= 0)
2339 wait_usec = 1;
2340 } else
2341 wait_usec = USEC_INFINITY;
2342
2343 r = sd_event_run(m->event, wait_usec);
2344 if (r < 0)
2345 return log_error_errno(r, "Failed to run event loop: %m");
2346 }
2347
2348 return m->exit_code;
2349 }
2350
2351 int manager_load_unit_from_dbus_path(Manager *m, const char *s, sd_bus_error *e, Unit **_u) {
2352 _cleanup_free_ char *n = NULL;
2353 sd_id128_t invocation_id;
2354 Unit *u;
2355 int r;
2356
2357 assert(m);
2358 assert(s);
2359 assert(_u);
2360
2361 r = unit_name_from_dbus_path(s, &n);
2362 if (r < 0)
2363 return r;
2364
2365 /* Permit addressing units by invocation ID: if the passed bus path is suffixed by a 128bit ID then we use it
2366 * as invocation ID. */
2367 r = sd_id128_from_string(n, &invocation_id);
2368 if (r >= 0) {
2369 u = hashmap_get(m->units_by_invocation_id, &invocation_id);
2370 if (u) {
2371 *_u = u;
2372 return 0;
2373 }
2374
2375 return sd_bus_error_setf(e, BUS_ERROR_NO_UNIT_FOR_INVOCATION_ID, "No unit with the specified invocation ID " SD_ID128_FORMAT_STR " known.", SD_ID128_FORMAT_VAL(invocation_id));
2376 }
2377
2378 /* If this didn't work, we check if this is a unit name */
2379 if (!unit_name_is_valid(n, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE))
2380 return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Unit name %s is neither a valid invocation ID nor unit name.", n);
2381
2382 r = manager_load_unit(m, n, NULL, e, &u);
2383 if (r < 0)
2384 return r;
2385
2386 *_u = u;
2387 return 0;
2388 }
2389
2390 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
2391 const char *p;
2392 unsigned id;
2393 Job *j;
2394 int r;
2395
2396 assert(m);
2397 assert(s);
2398 assert(_j);
2399
2400 p = startswith(s, "/org/freedesktop/systemd1/job/");
2401 if (!p)
2402 return -EINVAL;
2403
2404 r = safe_atou(p, &id);
2405 if (r < 0)
2406 return r;
2407
2408 j = manager_get_job(m, id);
2409 if (!j)
2410 return -ENOENT;
2411
2412 *_j = j;
2413
2414 return 0;
2415 }
2416
2417 void manager_send_unit_audit(Manager *m, Unit *u, int type, bool success) {
2418
2419 #ifdef HAVE_AUDIT
2420 _cleanup_free_ char *p = NULL;
2421 const char *msg;
2422 int audit_fd, r;
2423
2424 if (!MANAGER_IS_SYSTEM(m))
2425 return;
2426
2427 audit_fd = get_audit_fd();
2428 if (audit_fd < 0)
2429 return;
2430
2431 /* Don't generate audit events if the service was already
2432 * started and we're just deserializing */
2433 if (MANAGER_IS_RELOADING(m))
2434 return;
2435
2436 if (u->type != UNIT_SERVICE)
2437 return;
2438
2439 r = unit_name_to_prefix_and_instance(u->id, &p);
2440 if (r < 0) {
2441 log_error_errno(r, "Failed to extract prefix and instance of unit name: %m");
2442 return;
2443 }
2444
2445 msg = strjoina("unit=", p);
2446 if (audit_log_user_comm_message(audit_fd, type, msg, "systemd", NULL, NULL, NULL, success) < 0) {
2447 if (errno == EPERM)
2448 /* We aren't allowed to send audit messages?
2449 * Then let's not retry again. */
2450 close_audit_fd();
2451 else
2452 log_warning_errno(errno, "Failed to send audit message: %m");
2453 }
2454 #endif
2455
2456 }
2457
2458 void manager_send_unit_plymouth(Manager *m, Unit *u) {
2459 static const union sockaddr_union sa = PLYMOUTH_SOCKET;
2460 _cleanup_free_ char *message = NULL;
2461 _cleanup_close_ int fd = -1;
2462 int n = 0;
2463
2464 /* Don't generate plymouth events if the service was already
2465 * started and we're just deserializing */
2466 if (MANAGER_IS_RELOADING(m))
2467 return;
2468
2469 if (!MANAGER_IS_SYSTEM(m))
2470 return;
2471
2472 if (detect_container() > 0)
2473 return;
2474
2475 if (u->type != UNIT_SERVICE &&
2476 u->type != UNIT_MOUNT &&
2477 u->type != UNIT_SWAP)
2478 return;
2479
2480 /* We set SOCK_NONBLOCK here so that we rather drop the
2481 * message then wait for plymouth */
2482 fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
2483 if (fd < 0) {
2484 log_error_errno(errno, "socket() failed: %m");
2485 return;
2486 }
2487
2488 if (connect(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0) {
2489
2490 if (!IN_SET(errno, EPIPE, EAGAIN, ENOENT, ECONNREFUSED, ECONNRESET, ECONNABORTED))
2491 log_error_errno(errno, "connect() failed: %m");
2492 return;
2493 }
2494
2495 if (asprintf(&message, "U\002%c%s%n", (int) (strlen(u->id) + 1), u->id, &n) < 0) {
2496 log_oom();
2497 return;
2498 }
2499
2500 errno = 0;
2501 if (write(fd, message, n + 1) != n + 1)
2502 if (!IN_SET(errno, EPIPE, EAGAIN, ENOENT, ECONNREFUSED, ECONNRESET, ECONNABORTED))
2503 log_error_errno(errno, "Failed to write Plymouth message: %m");
2504 }
2505
2506 int manager_open_serialization(Manager *m, FILE **_f) {
2507 int fd;
2508 FILE *f;
2509
2510 assert(_f);
2511
2512 fd = open_serialization_fd("systemd-state");
2513 if (fd < 0)
2514 return fd;
2515
2516 f = fdopen(fd, "w+");
2517 if (!f) {
2518 safe_close(fd);
2519 return -errno;
2520 }
2521
2522 *_f = f;
2523 return 0;
2524 }
2525
2526 int manager_serialize(Manager *m, FILE *f, FDSet *fds, bool switching_root) {
2527 Iterator i;
2528 Unit *u;
2529 const char *t;
2530 int r;
2531
2532 assert(m);
2533 assert(f);
2534 assert(fds);
2535
2536 m->n_reloading++;
2537
2538 fprintf(f, "current-job-id=%"PRIu32"\n", m->current_job_id);
2539 fprintf(f, "taint-usr=%s\n", yes_no(m->taint_usr));
2540 fprintf(f, "n-installed-jobs=%u\n", m->n_installed_jobs);
2541 fprintf(f, "n-failed-jobs=%u\n", m->n_failed_jobs);
2542
2543 dual_timestamp_serialize(f, "firmware-timestamp", &m->firmware_timestamp);
2544 dual_timestamp_serialize(f, "loader-timestamp", &m->loader_timestamp);
2545 dual_timestamp_serialize(f, "kernel-timestamp", &m->kernel_timestamp);
2546 dual_timestamp_serialize(f, "initrd-timestamp", &m->initrd_timestamp);
2547
2548 if (!in_initrd()) {
2549 dual_timestamp_serialize(f, "userspace-timestamp", &m->userspace_timestamp);
2550 dual_timestamp_serialize(f, "finish-timestamp", &m->finish_timestamp);
2551 dual_timestamp_serialize(f, "security-start-timestamp", &m->security_start_timestamp);
2552 dual_timestamp_serialize(f, "security-finish-timestamp", &m->security_finish_timestamp);
2553 dual_timestamp_serialize(f, "generators-start-timestamp", &m->generators_start_timestamp);
2554 dual_timestamp_serialize(f, "generators-finish-timestamp", &m->generators_finish_timestamp);
2555 dual_timestamp_serialize(f, "units-load-start-timestamp", &m->units_load_start_timestamp);
2556 dual_timestamp_serialize(f, "units-load-finish-timestamp", &m->units_load_finish_timestamp);
2557 }
2558
2559 if (!switching_root)
2560 (void) serialize_environment(f, m->environment);
2561
2562 if (m->notify_fd >= 0) {
2563 int copy;
2564
2565 copy = fdset_put_dup(fds, m->notify_fd);
2566 if (copy < 0)
2567 return copy;
2568
2569 fprintf(f, "notify-fd=%i\n", copy);
2570 fprintf(f, "notify-socket=%s\n", m->notify_socket);
2571 }
2572
2573 if (m->cgroups_agent_fd >= 0) {
2574 int copy;
2575
2576 copy = fdset_put_dup(fds, m->cgroups_agent_fd);
2577 if (copy < 0)
2578 return copy;
2579
2580 fprintf(f, "cgroups-agent-fd=%i\n", copy);
2581 }
2582
2583 if (m->user_lookup_fds[0] >= 0) {
2584 int copy0, copy1;
2585
2586 copy0 = fdset_put_dup(fds, m->user_lookup_fds[0]);
2587 if (copy0 < 0)
2588 return copy0;
2589
2590 copy1 = fdset_put_dup(fds, m->user_lookup_fds[1]);
2591 if (copy1 < 0)
2592 return copy1;
2593
2594 fprintf(f, "user-lookup=%i %i\n", copy0, copy1);
2595 }
2596
2597 bus_track_serialize(m->subscribed, f, "subscribed");
2598
2599 r = dynamic_user_serialize(m, f, fds);
2600 if (r < 0)
2601 return r;
2602
2603 manager_serialize_uid_refs(m, f);
2604 manager_serialize_gid_refs(m, f);
2605
2606 fputc_unlocked('\n', f);
2607
2608 HASHMAP_FOREACH_KEY(u, t, m->units, i) {
2609 if (u->id != t)
2610 continue;
2611
2612 /* Start marker */
2613 fputs_unlocked(u->id, f);
2614 fputc_unlocked('\n', f);
2615
2616 r = unit_serialize(u, f, fds, !switching_root);
2617 if (r < 0) {
2618 m->n_reloading--;
2619 return r;
2620 }
2621 }
2622
2623 assert(m->n_reloading > 0);
2624 m->n_reloading--;
2625
2626 if (ferror(f))
2627 return -EIO;
2628
2629 r = bus_fdset_add_all(m, fds);
2630 if (r < 0)
2631 return r;
2632
2633 return 0;
2634 }
2635
2636 int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
2637 int r = 0;
2638
2639 assert(m);
2640 assert(f);
2641
2642 log_debug("Deserializing state...");
2643
2644 m->n_reloading++;
2645
2646 for (;;) {
2647 char line[LINE_MAX];
2648 const char *val, *l;
2649
2650 if (!fgets(line, sizeof(line), f)) {
2651 if (feof(f))
2652 r = 0;
2653 else
2654 r = -errno;
2655
2656 goto finish;
2657 }
2658
2659 char_array_0(line);
2660 l = strstrip(line);
2661
2662 if (l[0] == 0)
2663 break;
2664
2665 if ((val = startswith(l, "current-job-id="))) {
2666 uint32_t id;
2667
2668 if (safe_atou32(val, &id) < 0)
2669 log_notice("Failed to parse current job id value %s", val);
2670 else
2671 m->current_job_id = MAX(m->current_job_id, id);
2672
2673 } else if ((val = startswith(l, "n-installed-jobs="))) {
2674 uint32_t n;
2675
2676 if (safe_atou32(val, &n) < 0)
2677 log_notice("Failed to parse installed jobs counter %s", val);
2678 else
2679 m->n_installed_jobs += n;
2680
2681 } else if ((val = startswith(l, "n-failed-jobs="))) {
2682 uint32_t n;
2683
2684 if (safe_atou32(val, &n) < 0)
2685 log_notice("Failed to parse failed jobs counter %s", val);
2686 else
2687 m->n_failed_jobs += n;
2688
2689 } else if ((val = startswith(l, "taint-usr="))) {
2690 int b;
2691
2692 b = parse_boolean(val);
2693 if (b < 0)
2694 log_notice("Failed to parse taint /usr flag %s", val);
2695 else
2696 m->taint_usr = m->taint_usr || b;
2697
2698 } else if ((val = startswith(l, "firmware-timestamp=")))
2699 dual_timestamp_deserialize(val, &m->firmware_timestamp);
2700 else if ((val = startswith(l, "loader-timestamp=")))
2701 dual_timestamp_deserialize(val, &m->loader_timestamp);
2702 else if ((val = startswith(l, "kernel-timestamp=")))
2703 dual_timestamp_deserialize(val, &m->kernel_timestamp);
2704 else if ((val = startswith(l, "initrd-timestamp=")))
2705 dual_timestamp_deserialize(val, &m->initrd_timestamp);
2706 else if ((val = startswith(l, "userspace-timestamp=")))
2707 dual_timestamp_deserialize(val, &m->userspace_timestamp);
2708 else if ((val = startswith(l, "finish-timestamp=")))
2709 dual_timestamp_deserialize(val, &m->finish_timestamp);
2710 else if ((val = startswith(l, "security-start-timestamp=")))
2711 dual_timestamp_deserialize(val, &m->security_start_timestamp);
2712 else if ((val = startswith(l, "security-finish-timestamp=")))
2713 dual_timestamp_deserialize(val, &m->security_finish_timestamp);
2714 else if ((val = startswith(l, "generators-start-timestamp=")))
2715 dual_timestamp_deserialize(val, &m->generators_start_timestamp);
2716 else if ((val = startswith(l, "generators-finish-timestamp=")))
2717 dual_timestamp_deserialize(val, &m->generators_finish_timestamp);
2718 else if ((val = startswith(l, "units-load-start-timestamp=")))
2719 dual_timestamp_deserialize(val, &m->units_load_start_timestamp);
2720 else if ((val = startswith(l, "units-load-finish-timestamp=")))
2721 dual_timestamp_deserialize(val, &m->units_load_finish_timestamp);
2722 else if (startswith(l, "env=")) {
2723 r = deserialize_environment(&m->environment, l);
2724 if (r == -ENOMEM)
2725 goto finish;
2726 if (r < 0)
2727 log_notice_errno(r, "Failed to parse environment entry: \"%s\": %m", l);
2728
2729 } else if ((val = startswith(l, "notify-fd="))) {
2730 int fd;
2731
2732 if (safe_atoi(val, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
2733 log_notice("Failed to parse notify fd: \"%s\"", val);
2734 else {
2735 m->notify_event_source = sd_event_source_unref(m->notify_event_source);
2736 safe_close(m->notify_fd);
2737 m->notify_fd = fdset_remove(fds, fd);
2738 }
2739
2740 } else if ((val = startswith(l, "notify-socket="))) {
2741 char *n;
2742
2743 n = strdup(val);
2744 if (!n) {
2745 r = -ENOMEM;
2746 goto finish;
2747 }
2748
2749 free(m->notify_socket);
2750 m->notify_socket = n;
2751
2752 } else if ((val = startswith(l, "cgroups-agent-fd="))) {
2753 int fd;
2754
2755 if (safe_atoi(val, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
2756 log_notice("Failed to parse cgroups agent fd: %s", val);
2757 else {
2758 m->cgroups_agent_event_source = sd_event_source_unref(m->cgroups_agent_event_source);
2759 safe_close(m->cgroups_agent_fd);
2760 m->cgroups_agent_fd = fdset_remove(fds, fd);
2761 }
2762
2763 } else if ((val = startswith(l, "user-lookup="))) {
2764 int fd0, fd1;
2765
2766 if (sscanf(val, "%i %i", &fd0, &fd1) != 2 || fd0 < 0 || fd1 < 0 || fd0 == fd1 || !fdset_contains(fds, fd0) || !fdset_contains(fds, fd1))
2767 log_notice("Failed to parse user lookup fd: %s", val);
2768 else {
2769 m->user_lookup_event_source = sd_event_source_unref(m->user_lookup_event_source);
2770 safe_close_pair(m->user_lookup_fds);
2771 m->user_lookup_fds[0] = fdset_remove(fds, fd0);
2772 m->user_lookup_fds[1] = fdset_remove(fds, fd1);
2773 }
2774
2775 } else if ((val = startswith(l, "dynamic-user=")))
2776 dynamic_user_deserialize_one(m, val, fds);
2777 else if ((val = startswith(l, "destroy-ipc-uid=")))
2778 manager_deserialize_uid_refs_one(m, val);
2779 else if ((val = startswith(l, "destroy-ipc-gid=")))
2780 manager_deserialize_gid_refs_one(m, val);
2781 else if ((val = startswith(l, "subscribed="))) {
2782
2783 if (strv_extend(&m->deserialized_subscribed, val) < 0)
2784 log_oom();
2785
2786 } else if (!startswith(l, "kdbus-fd=")) /* ignore this one */
2787 log_notice("Unknown serialization item '%s'", l);
2788 }
2789
2790 for (;;) {
2791 Unit *u;
2792 char name[UNIT_NAME_MAX+2];
2793 const char* unit_name;
2794
2795 /* Start marker */
2796 if (!fgets(name, sizeof(name), f)) {
2797 if (feof(f))
2798 r = 0;
2799 else
2800 r = -errno;
2801
2802 goto finish;
2803 }
2804
2805 char_array_0(name);
2806 unit_name = strstrip(name);
2807
2808 r = manager_load_unit(m, unit_name, NULL, NULL, &u);
2809 if (r < 0) {
2810 log_notice_errno(r, "Failed to load unit \"%s\", skipping deserialization: %m", unit_name);
2811 if (r == -ENOMEM)
2812 goto finish;
2813 unit_deserialize_skip(f);
2814 continue;
2815 }
2816
2817 r = unit_deserialize(u, f, fds);
2818 if (r < 0) {
2819 log_notice_errno(r, "Failed to deserialize unit \"%s\": %m", unit_name);
2820 if (r == -ENOMEM)
2821 goto finish;
2822 }
2823 }
2824
2825 finish:
2826 if (ferror(f))
2827 r = -EIO;
2828
2829 assert(m->n_reloading > 0);
2830 m->n_reloading--;
2831
2832 return r;
2833 }
2834
2835 int manager_reload(Manager *m) {
2836 int r, q;
2837 _cleanup_fclose_ FILE *f = NULL;
2838 _cleanup_fdset_free_ FDSet *fds = NULL;
2839
2840 assert(m);
2841
2842 r = manager_open_serialization(m, &f);
2843 if (r < 0)
2844 return r;
2845
2846 m->n_reloading++;
2847 bus_manager_send_reloading(m, true);
2848
2849 fds = fdset_new();
2850 if (!fds) {
2851 m->n_reloading--;
2852 return -ENOMEM;
2853 }
2854
2855 r = manager_serialize(m, f, fds, false);
2856 if (r < 0) {
2857 m->n_reloading--;
2858 return r;
2859 }
2860
2861 if (fseeko(f, 0, SEEK_SET) < 0) {
2862 m->n_reloading--;
2863 return -errno;
2864 }
2865
2866 /* From here on there is no way back. */
2867 manager_clear_jobs_and_units(m);
2868 lookup_paths_flush_generator(&m->lookup_paths);
2869 lookup_paths_free(&m->lookup_paths);
2870 dynamic_user_vacuum(m, false);
2871 m->uid_refs = hashmap_free(m->uid_refs);
2872 m->gid_refs = hashmap_free(m->gid_refs);
2873
2874 q = lookup_paths_init(&m->lookup_paths, m->unit_file_scope, 0, NULL);
2875 if (q < 0 && r >= 0)
2876 r = q;
2877
2878 q = manager_run_environment_generators(m);
2879 if (q < 0 && r >= 0)
2880 r = q;
2881
2882 /* Find new unit paths */
2883 q = manager_run_generators(m);
2884 if (q < 0 && r >= 0)
2885 r = q;
2886
2887 lookup_paths_reduce(&m->lookup_paths);
2888 manager_build_unit_path_cache(m);
2889
2890 /* First, enumerate what we can from all config files */
2891 manager_enumerate(m);
2892
2893 /* Second, deserialize our stored data */
2894 q = manager_deserialize(m, f, fds);
2895 if (q < 0) {
2896 log_error_errno(q, "Deserialization failed: %m");
2897
2898 if (r >= 0)
2899 r = q;
2900 }
2901
2902 fclose(f);
2903 f = NULL;
2904
2905 /* Re-register notify_fd as event source */
2906 q = manager_setup_notify(m);
2907 if (q < 0 && r >= 0)
2908 r = q;
2909
2910 q = manager_setup_cgroups_agent(m);
2911 if (q < 0 && r >= 0)
2912 r = q;
2913
2914 q = manager_setup_user_lookup_fd(m);
2915 if (q < 0 && r >= 0)
2916 r = q;
2917
2918 /* Third, fire things up! */
2919 manager_coldplug(m);
2920
2921 /* Release any dynamic users no longer referenced */
2922 dynamic_user_vacuum(m, true);
2923
2924 /* Release any references to UIDs/GIDs no longer referenced, and destroy any IPC owned by them */
2925 manager_vacuum_uid_refs(m);
2926 manager_vacuum_gid_refs(m);
2927
2928 /* Sync current state of bus names with our set of listening units */
2929 if (m->api_bus)
2930 manager_sync_bus_names(m, m->api_bus);
2931
2932 assert(m->n_reloading > 0);
2933 m->n_reloading--;
2934
2935 m->send_reloading_done = true;
2936
2937 return r;
2938 }
2939
2940 void manager_reset_failed(Manager *m) {
2941 Unit *u;
2942 Iterator i;
2943
2944 assert(m);
2945
2946 HASHMAP_FOREACH(u, m->units, i)
2947 unit_reset_failed(u);
2948 }
2949
2950 bool manager_unit_inactive_or_pending(Manager *m, const char *name) {
2951 Unit *u;
2952
2953 assert(m);
2954 assert(name);
2955
2956 /* Returns true if the unit is inactive or going down */
2957 u = manager_get_unit(m, name);
2958 if (!u)
2959 return true;
2960
2961 return unit_inactive_or_pending(u);
2962 }
2963
2964 static void manager_notify_finished(Manager *m) {
2965 char userspace[FORMAT_TIMESPAN_MAX], initrd[FORMAT_TIMESPAN_MAX], kernel[FORMAT_TIMESPAN_MAX], sum[FORMAT_TIMESPAN_MAX];
2966 usec_t firmware_usec, loader_usec, kernel_usec, initrd_usec, userspace_usec, total_usec;
2967
2968 if (m->test_run)
2969 return;
2970
2971 if (MANAGER_IS_SYSTEM(m) && detect_container() <= 0) {
2972
2973 /* Note that m->kernel_usec.monotonic is always at 0,
2974 * and m->firmware_usec.monotonic and
2975 * m->loader_usec.monotonic should be considered
2976 * negative values. */
2977
2978 firmware_usec = m->firmware_timestamp.monotonic - m->loader_timestamp.monotonic;
2979 loader_usec = m->loader_timestamp.monotonic - m->kernel_timestamp.monotonic;
2980 userspace_usec = m->finish_timestamp.monotonic - m->userspace_timestamp.monotonic;
2981 total_usec = m->firmware_timestamp.monotonic + m->finish_timestamp.monotonic;
2982
2983 if (dual_timestamp_is_set(&m->initrd_timestamp)) {
2984
2985 kernel_usec = m->initrd_timestamp.monotonic - m->kernel_timestamp.monotonic;
2986 initrd_usec = m->userspace_timestamp.monotonic - m->initrd_timestamp.monotonic;
2987
2988 log_struct(LOG_INFO,
2989 "MESSAGE_ID=" SD_MESSAGE_STARTUP_FINISHED_STR,
2990 "KERNEL_USEC="USEC_FMT, kernel_usec,
2991 "INITRD_USEC="USEC_FMT, initrd_usec,
2992 "USERSPACE_USEC="USEC_FMT, userspace_usec,
2993 LOG_MESSAGE("Startup finished in %s (kernel) + %s (initrd) + %s (userspace) = %s.",
2994 format_timespan(kernel, sizeof(kernel), kernel_usec, USEC_PER_MSEC),
2995 format_timespan(initrd, sizeof(initrd), initrd_usec, USEC_PER_MSEC),
2996 format_timespan(userspace, sizeof(userspace), userspace_usec, USEC_PER_MSEC),
2997 format_timespan(sum, sizeof(sum), total_usec, USEC_PER_MSEC)),
2998 NULL);
2999 } else {
3000 kernel_usec = m->userspace_timestamp.monotonic - m->kernel_timestamp.monotonic;
3001 initrd_usec = 0;
3002
3003 log_struct(LOG_INFO,
3004 "MESSAGE_ID=" SD_MESSAGE_STARTUP_FINISHED_STR,
3005 "KERNEL_USEC="USEC_FMT, kernel_usec,
3006 "USERSPACE_USEC="USEC_FMT, userspace_usec,
3007 LOG_MESSAGE("Startup finished in %s (kernel) + %s (userspace) = %s.",
3008 format_timespan(kernel, sizeof(kernel), kernel_usec, USEC_PER_MSEC),
3009 format_timespan(userspace, sizeof(userspace), userspace_usec, USEC_PER_MSEC),
3010 format_timespan(sum, sizeof(sum), total_usec, USEC_PER_MSEC)),
3011 NULL);
3012 }
3013 } else {
3014 firmware_usec = loader_usec = initrd_usec = kernel_usec = 0;
3015 total_usec = userspace_usec = m->finish_timestamp.monotonic - m->userspace_timestamp.monotonic;
3016
3017 log_struct(LOG_INFO,
3018 "MESSAGE_ID=" SD_MESSAGE_USER_STARTUP_FINISHED_STR,
3019 "USERSPACE_USEC="USEC_FMT, userspace_usec,
3020 LOG_MESSAGE("Startup finished in %s.",
3021 format_timespan(sum, sizeof(sum), total_usec, USEC_PER_MSEC)),
3022 NULL);
3023 }
3024
3025 bus_manager_send_finished(m, firmware_usec, loader_usec, kernel_usec, initrd_usec, userspace_usec, total_usec);
3026
3027 sd_notifyf(false,
3028 "READY=1\n"
3029 "STATUS=Startup finished in %s.",
3030 format_timespan(sum, sizeof(sum), total_usec, USEC_PER_MSEC));
3031 }
3032
3033 void manager_check_finished(Manager *m) {
3034 assert(m);
3035
3036 if (MANAGER_IS_RELOADING(m))
3037 return;
3038
3039 /* Verify that we are actually running currently. Initially
3040 * the exit code is set to invalid, and during operation it is
3041 * then set to MANAGER_OK */
3042 if (m->exit_code != MANAGER_OK)
3043 return;
3044
3045 if (hashmap_size(m->jobs) > 0) {
3046 if (m->jobs_in_progress_event_source)
3047 /* Ignore any failure, this is only for feedback */
3048 (void) sd_event_source_set_time(m->jobs_in_progress_event_source, now(CLOCK_MONOTONIC) + JOBS_IN_PROGRESS_WAIT_USEC);
3049
3050 return;
3051 }
3052
3053 manager_flip_auto_status(m, false);
3054
3055 /* Notify Type=idle units that we are done now */
3056 manager_close_idle_pipe(m);
3057
3058 /* Turn off confirm spawn now */
3059 m->confirm_spawn = NULL;
3060
3061 /* No need to update ask password status when we're going non-interactive */
3062 manager_close_ask_password(m);
3063
3064 /* This is no longer the first boot */
3065 manager_set_first_boot(m, false);
3066
3067 if (dual_timestamp_is_set(&m->finish_timestamp))
3068 return;
3069
3070 dual_timestamp_get(&m->finish_timestamp);
3071
3072 manager_notify_finished(m);
3073
3074 manager_invalidate_startup_units(m);
3075 }
3076
3077 static bool generator_path_any(const char* const* paths) {
3078 char **path;
3079 bool found = false;
3080
3081 /* Optimize by skipping the whole process by not creating output directories
3082 * if no generators are found. */
3083 STRV_FOREACH(path, (char**) paths)
3084 if (access(*path, F_OK) == 0)
3085 found = true;
3086 else if (errno != ENOENT)
3087 log_warning_errno(errno, "Failed to open generator directory %s: %m", *path);
3088
3089 return found;
3090 }
3091
3092 static const char* system_env_generator_binary_paths[] = {
3093 "/run/systemd/system-environment-generators",
3094 "/etc/systemd/system-environment-generators",
3095 "/usr/local/lib/systemd/system-environment-generators",
3096 SYSTEM_ENV_GENERATOR_PATH,
3097 NULL
3098 };
3099
3100 static const char* user_env_generator_binary_paths[] = {
3101 "/run/systemd/user-environment-generators",
3102 "/etc/systemd/user-environment-generators",
3103 "/usr/local/lib/systemd/user-environment-generators",
3104 USER_ENV_GENERATOR_PATH,
3105 NULL
3106 };
3107
3108 static int manager_run_environment_generators(Manager *m) {
3109 char **tmp = NULL; /* this is only used in the forked process, no cleanup here */
3110 const char **paths;
3111 void* args[] = {&tmp, &tmp, &m->environment};
3112
3113 if (m->test_run)
3114 return 0;
3115
3116 paths = MANAGER_IS_SYSTEM(m) ? system_env_generator_binary_paths : user_env_generator_binary_paths;
3117
3118 if (!generator_path_any(paths))
3119 return 0;
3120
3121 return execute_directories(paths, DEFAULT_TIMEOUT_USEC, gather_environment, args, NULL);
3122 }
3123
3124 static int manager_run_generators(Manager *m) {
3125 _cleanup_strv_free_ char **paths = NULL;
3126 const char *argv[5];
3127 int r;
3128
3129 assert(m);
3130
3131 if (m->test_run)
3132 return 0;
3133
3134 paths = generator_binary_paths(m->unit_file_scope);
3135 if (!paths)
3136 return log_oom();
3137
3138 if (!generator_path_any((const char* const*) paths))
3139 return 0;
3140
3141 r = lookup_paths_mkdir_generator(&m->lookup_paths);
3142 if (r < 0)
3143 goto finish;
3144
3145 argv[0] = NULL; /* Leave this empty, execute_directory() will fill something in */
3146 argv[1] = m->lookup_paths.generator;
3147 argv[2] = m->lookup_paths.generator_early;
3148 argv[3] = m->lookup_paths.generator_late;
3149 argv[4] = NULL;
3150
3151 RUN_WITH_UMASK(0022)
3152 execute_directories((const char* const*) paths, DEFAULT_TIMEOUT_USEC,
3153 NULL, NULL, (char**) argv);
3154
3155 finish:
3156 lookup_paths_trim_generator(&m->lookup_paths);
3157 return r;
3158 }
3159
3160 int manager_environment_add(Manager *m, char **minus, char **plus) {
3161 char **a = NULL, **b = NULL, **l;
3162 assert(m);
3163
3164 l = m->environment;
3165
3166 if (!strv_isempty(minus)) {
3167 a = strv_env_delete(l, 1, minus);
3168 if (!a)
3169 return -ENOMEM;
3170
3171 l = a;
3172 }
3173
3174 if (!strv_isempty(plus)) {
3175 b = strv_env_merge(2, l, plus);
3176 if (!b) {
3177 strv_free(a);
3178 return -ENOMEM;
3179 }
3180
3181 l = b;
3182 }
3183
3184 if (m->environment != l)
3185 strv_free(m->environment);
3186 if (a != l)
3187 strv_free(a);
3188 if (b != l)
3189 strv_free(b);
3190
3191 m->environment = l;
3192 manager_clean_environment(m);
3193 strv_sort(m->environment);
3194
3195 return 0;
3196 }
3197
3198 int manager_set_default_rlimits(Manager *m, struct rlimit **default_rlimit) {
3199 int i;
3200
3201 assert(m);
3202
3203 for (i = 0; i < _RLIMIT_MAX; i++) {
3204 m->rlimit[i] = mfree(m->rlimit[i]);
3205
3206 if (!default_rlimit[i])
3207 continue;
3208
3209 m->rlimit[i] = newdup(struct rlimit, default_rlimit[i], 1);
3210 if (!m->rlimit[i])
3211 return log_oom();
3212 }
3213
3214 return 0;
3215 }
3216
3217 void manager_recheck_journal(Manager *m) {
3218 Unit *u;
3219
3220 assert(m);
3221
3222 if (!MANAGER_IS_SYSTEM(m))
3223 return;
3224
3225 u = manager_get_unit(m, SPECIAL_JOURNALD_SOCKET);
3226 if (u && SOCKET(u)->state != SOCKET_RUNNING) {
3227 log_close_journal();
3228 return;
3229 }
3230
3231 u = manager_get_unit(m, SPECIAL_JOURNALD_SERVICE);
3232 if (u && SERVICE(u)->state != SERVICE_RUNNING) {
3233 log_close_journal();
3234 return;
3235 }
3236
3237 /* Hmm, OK, so the socket is fully up and the service is up
3238 * too, then let's make use of the thing. */
3239 log_open();
3240 }
3241
3242 void manager_set_show_status(Manager *m, ShowStatus mode) {
3243 assert(m);
3244 assert(IN_SET(mode, SHOW_STATUS_AUTO, SHOW_STATUS_NO, SHOW_STATUS_YES, SHOW_STATUS_TEMPORARY));
3245
3246 if (!MANAGER_IS_SYSTEM(m))
3247 return;
3248
3249 if (m->show_status != mode)
3250 log_debug("%s showing of status.",
3251 mode == SHOW_STATUS_NO ? "Disabling" : "Enabling");
3252 m->show_status = mode;
3253
3254 if (mode > 0)
3255 (void) touch("/run/systemd/show-status");
3256 else
3257 (void) unlink("/run/systemd/show-status");
3258 }
3259
3260 static bool manager_get_show_status(Manager *m, StatusType type) {
3261 assert(m);
3262
3263 if (!MANAGER_IS_SYSTEM(m))
3264 return false;
3265
3266 if (m->no_console_output)
3267 return false;
3268
3269 if (!IN_SET(manager_state(m), MANAGER_INITIALIZING, MANAGER_STARTING, MANAGER_STOPPING))
3270 return false;
3271
3272 /* If we cannot find out the status properly, just proceed. */
3273 if (type != STATUS_TYPE_EMERGENCY && manager_check_ask_password(m) > 0)
3274 return false;
3275
3276 if (m->show_status > 0)
3277 return true;
3278
3279 return false;
3280 }
3281
3282 const char *manager_get_confirm_spawn(Manager *m) {
3283 static int last_errno = 0;
3284 const char *vc = m->confirm_spawn;
3285 struct stat st;
3286 int r;
3287
3288 /* Here's the deal: we want to test the validity of the console but don't want
3289 * PID1 to go through the whole console process which might block. But we also
3290 * want to warn the user only once if something is wrong with the console so we
3291 * cannot do the sanity checks after spawning our children. So here we simply do
3292 * really basic tests to hopefully trap common errors.
3293 *
3294 * If the console suddenly disappear at the time our children will really it
3295 * then they will simply fail to acquire it and a positive answer will be
3296 * assumed. New children will fallback to /dev/console though.
3297 *
3298 * Note: TTYs are devices that can come and go any time, and frequently aren't
3299 * available yet during early boot (consider a USB rs232 dongle...). If for any
3300 * reason the configured console is not ready, we fallback to the default
3301 * console. */
3302
3303 if (!vc || path_equal(vc, "/dev/console"))
3304 return vc;
3305
3306 r = stat(vc, &st);
3307 if (r < 0)
3308 goto fail;
3309
3310 if (!S_ISCHR(st.st_mode)) {
3311 errno = ENOTTY;
3312 goto fail;
3313 }
3314
3315 last_errno = 0;
3316 return vc;
3317 fail:
3318 if (last_errno != errno) {
3319 last_errno = errno;
3320 log_warning_errno(errno, "Failed to open %s: %m, using default console", vc);
3321 }
3322 return "/dev/console";
3323 }
3324
3325 void manager_set_first_boot(Manager *m, bool b) {
3326 assert(m);
3327
3328 if (!MANAGER_IS_SYSTEM(m))
3329 return;
3330
3331 if (m->first_boot != (int) b) {
3332 if (b)
3333 (void) touch("/run/systemd/first-boot");
3334 else
3335 (void) unlink("/run/systemd/first-boot");
3336 }
3337
3338 m->first_boot = b;
3339 }
3340
3341 void manager_disable_confirm_spawn(void) {
3342 (void) touch("/run/systemd/confirm_spawn_disabled");
3343 }
3344
3345 bool manager_is_confirm_spawn_disabled(Manager *m) {
3346 if (!m->confirm_spawn)
3347 return true;
3348
3349 return access("/run/systemd/confirm_spawn_disabled", F_OK) >= 0;
3350 }
3351
3352 void manager_status_printf(Manager *m, StatusType type, const char *status, const char *format, ...) {
3353 va_list ap;
3354
3355 /* If m is NULL, assume we're after shutdown and let the messages through. */
3356
3357 if (m && !manager_get_show_status(m, type))
3358 return;
3359
3360 /* XXX We should totally drop the check for ephemeral here
3361 * and thus effectively make 'Type=idle' pointless. */
3362 if (type == STATUS_TYPE_EPHEMERAL && m && m->n_on_console > 0)
3363 return;
3364
3365 va_start(ap, format);
3366 status_vprintf(status, true, type == STATUS_TYPE_EPHEMERAL, format, ap);
3367 va_end(ap);
3368 }
3369
3370 Set *manager_get_units_requiring_mounts_for(Manager *m, const char *path) {
3371 char p[strlen(path)+1];
3372
3373 assert(m);
3374 assert(path);
3375
3376 strcpy(p, path);
3377 path_kill_slashes(p);
3378
3379 return hashmap_get(m->units_requiring_mounts_for, streq(p, "/") ? "" : p);
3380 }
3381
3382 int manager_set_exec_params(Manager *m, ExecParameters *p) {
3383 assert(m);
3384 assert(p);
3385
3386 p->environment = m->environment;
3387 p->confirm_spawn = manager_get_confirm_spawn(m);
3388 p->cgroup_supported = m->cgroup_supported;
3389 p->prefix = m->prefix;
3390
3391 return 0;
3392 }
3393
3394 int manager_update_failed_units(Manager *m, Unit *u, bool failed) {
3395 unsigned size;
3396 int r;
3397
3398 assert(m);
3399 assert(u->manager == m);
3400
3401 size = set_size(m->failed_units);
3402
3403 if (failed) {
3404 r = set_ensure_allocated(&m->failed_units, NULL);
3405 if (r < 0)
3406 return log_oom();
3407
3408 if (set_put(m->failed_units, u) < 0)
3409 return log_oom();
3410 } else
3411 (void) set_remove(m->failed_units, u);
3412
3413 if (set_size(m->failed_units) != size)
3414 bus_manager_send_change_signal(m);
3415
3416 return 0;
3417 }
3418
3419 ManagerState manager_state(Manager *m) {
3420 Unit *u;
3421
3422 assert(m);
3423
3424 /* Did we ever finish booting? If not then we are still starting up */
3425 if (!dual_timestamp_is_set(&m->finish_timestamp)) {
3426
3427 u = manager_get_unit(m, SPECIAL_BASIC_TARGET);
3428 if (!u || !UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u)))
3429 return MANAGER_INITIALIZING;
3430
3431 return MANAGER_STARTING;
3432 }
3433
3434 /* Is the special shutdown target queued? If so, we are in shutdown state */
3435 u = manager_get_unit(m, SPECIAL_SHUTDOWN_TARGET);
3436 if (u && u->job && IN_SET(u->job->type, JOB_START, JOB_RESTART, JOB_RELOAD_OR_START))
3437 return MANAGER_STOPPING;
3438
3439 /* Are the rescue or emergency targets active or queued? If so we are in maintenance state */
3440 u = manager_get_unit(m, SPECIAL_RESCUE_TARGET);
3441 if (u && (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)) ||
3442 (u->job && IN_SET(u->job->type, JOB_START, JOB_RESTART, JOB_RELOAD_OR_START))))
3443 return MANAGER_MAINTENANCE;
3444
3445 u = manager_get_unit(m, SPECIAL_EMERGENCY_TARGET);
3446 if (u && (UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)) ||
3447 (u->job && IN_SET(u->job->type, JOB_START, JOB_RESTART, JOB_RELOAD_OR_START))))
3448 return MANAGER_MAINTENANCE;
3449
3450 /* Are there any failed units? If so, we are in degraded mode */
3451 if (set_size(m->failed_units) > 0)
3452 return MANAGER_DEGRADED;
3453
3454 return MANAGER_RUNNING;
3455 }
3456
3457 #define DESTROY_IPC_FLAG (UINT32_C(1) << 31)
3458
3459 static void manager_unref_uid_internal(
3460 Manager *m,
3461 Hashmap **uid_refs,
3462 uid_t uid,
3463 bool destroy_now,
3464 int (*_clean_ipc)(uid_t uid)) {
3465
3466 uint32_t c, n;
3467
3468 assert(m);
3469 assert(uid_refs);
3470 assert(uid_is_valid(uid));
3471 assert(_clean_ipc);
3472
3473 /* A generic implementation, covering both manager_unref_uid() and manager_unref_gid(), under the assumption
3474 * that uid_t and gid_t are actually defined the same way, with the same validity rules.
3475 *
3476 * We store a hashmap where the UID/GID is they key and the value is a 32bit reference counter, whose highest
3477 * bit is used as flag for marking UIDs/GIDs whose IPC objects to remove when the last reference to the UID/GID
3478 * is dropped. The flag is set to on, once at least one reference from a unit where RemoveIPC= is set is added
3479 * on a UID/GID. It is reset when the UID's/GID's reference counter drops to 0 again. */
3480
3481 assert_cc(sizeof(uid_t) == sizeof(gid_t));
3482 assert_cc(UID_INVALID == (uid_t) GID_INVALID);
3483
3484 if (uid == 0) /* We don't keep track of root, and will never destroy it */
3485 return;
3486
3487 c = PTR_TO_UINT32(hashmap_get(*uid_refs, UID_TO_PTR(uid)));
3488
3489 n = c & ~DESTROY_IPC_FLAG;
3490 assert(n > 0);
3491 n--;
3492
3493 if (destroy_now && n == 0) {
3494 hashmap_remove(*uid_refs, UID_TO_PTR(uid));
3495
3496 if (c & DESTROY_IPC_FLAG) {
3497 log_debug("%s " UID_FMT " is no longer referenced, cleaning up its IPC.",
3498 _clean_ipc == clean_ipc_by_uid ? "UID" : "GID",
3499 uid);
3500 (void) _clean_ipc(uid);
3501 }
3502 } else {
3503 c = n | (c & DESTROY_IPC_FLAG);
3504 assert_se(hashmap_update(*uid_refs, UID_TO_PTR(uid), UINT32_TO_PTR(c)) >= 0);
3505 }
3506 }
3507
3508 void manager_unref_uid(Manager *m, uid_t uid, bool destroy_now) {
3509 manager_unref_uid_internal(m, &m->uid_refs, uid, destroy_now, clean_ipc_by_uid);
3510 }
3511
3512 void manager_unref_gid(Manager *m, gid_t gid, bool destroy_now) {
3513 manager_unref_uid_internal(m, &m->gid_refs, (uid_t) gid, destroy_now, clean_ipc_by_gid);
3514 }
3515
3516 static int manager_ref_uid_internal(
3517 Manager *m,
3518 Hashmap **uid_refs,
3519 uid_t uid,
3520 bool clean_ipc) {
3521
3522 uint32_t c, n;
3523 int r;
3524
3525 assert(m);
3526 assert(uid_refs);
3527 assert(uid_is_valid(uid));
3528
3529 /* A generic implementation, covering both manager_ref_uid() and manager_ref_gid(), under the assumption
3530 * that uid_t and gid_t are actually defined the same way, with the same validity rules. */
3531
3532 assert_cc(sizeof(uid_t) == sizeof(gid_t));
3533 assert_cc(UID_INVALID == (uid_t) GID_INVALID);
3534
3535 if (uid == 0) /* We don't keep track of root, and will never destroy it */
3536 return 0;
3537
3538 r = hashmap_ensure_allocated(uid_refs, &trivial_hash_ops);
3539 if (r < 0)
3540 return r;
3541
3542 c = PTR_TO_UINT32(hashmap_get(*uid_refs, UID_TO_PTR(uid)));
3543
3544 n = c & ~DESTROY_IPC_FLAG;
3545 n++;
3546
3547 if (n & DESTROY_IPC_FLAG) /* check for overflow */
3548 return -EOVERFLOW;
3549
3550 c = n | (c & DESTROY_IPC_FLAG) | (clean_ipc ? DESTROY_IPC_FLAG : 0);
3551
3552 return hashmap_replace(*uid_refs, UID_TO_PTR(uid), UINT32_TO_PTR(c));
3553 }
3554
3555 int manager_ref_uid(Manager *m, uid_t uid, bool clean_ipc) {
3556 return manager_ref_uid_internal(m, &m->uid_refs, uid, clean_ipc);
3557 }
3558
3559 int manager_ref_gid(Manager *m, gid_t gid, bool clean_ipc) {
3560 return manager_ref_uid_internal(m, &m->gid_refs, (uid_t) gid, clean_ipc);
3561 }
3562
3563 static void manager_vacuum_uid_refs_internal(
3564 Manager *m,
3565 Hashmap **uid_refs,
3566 int (*_clean_ipc)(uid_t uid)) {
3567
3568 Iterator i;
3569 void *p, *k;
3570
3571 assert(m);
3572 assert(uid_refs);
3573 assert(_clean_ipc);
3574
3575 HASHMAP_FOREACH_KEY(p, k, *uid_refs, i) {
3576 uint32_t c, n;
3577 uid_t uid;
3578
3579 uid = PTR_TO_UID(k);
3580 c = PTR_TO_UINT32(p);
3581
3582 n = c & ~DESTROY_IPC_FLAG;
3583 if (n > 0)
3584 continue;
3585
3586 if (c & DESTROY_IPC_FLAG) {
3587 log_debug("Found unreferenced %s " UID_FMT " after reload/reexec. Cleaning up.",
3588 _clean_ipc == clean_ipc_by_uid ? "UID" : "GID",
3589 uid);
3590 (void) _clean_ipc(uid);
3591 }
3592
3593 assert_se(hashmap_remove(*uid_refs, k) == p);
3594 }
3595 }
3596
3597 void manager_vacuum_uid_refs(Manager *m) {
3598 manager_vacuum_uid_refs_internal(m, &m->uid_refs, clean_ipc_by_uid);
3599 }
3600
3601 void manager_vacuum_gid_refs(Manager *m) {
3602 manager_vacuum_uid_refs_internal(m, &m->gid_refs, clean_ipc_by_gid);
3603 }
3604
3605 static void manager_serialize_uid_refs_internal(
3606 Manager *m,
3607 FILE *f,
3608 Hashmap **uid_refs,
3609 const char *field_name) {
3610
3611 Iterator i;
3612 void *p, *k;
3613
3614 assert(m);
3615 assert(f);
3616 assert(uid_refs);
3617 assert(field_name);
3618
3619 /* Serialize the UID reference table. Or actually, just the IPC destruction flag of it, as the actual counter
3620 * of it is better rebuild after a reload/reexec. */
3621
3622 HASHMAP_FOREACH_KEY(p, k, *uid_refs, i) {
3623 uint32_t c;
3624 uid_t uid;
3625
3626 uid = PTR_TO_UID(k);
3627 c = PTR_TO_UINT32(p);
3628
3629 if (!(c & DESTROY_IPC_FLAG))
3630 continue;
3631
3632 fprintf(f, "%s=" UID_FMT "\n", field_name, uid);
3633 }
3634 }
3635
3636 void manager_serialize_uid_refs(Manager *m, FILE *f) {
3637 manager_serialize_uid_refs_internal(m, f, &m->uid_refs, "destroy-ipc-uid");
3638 }
3639
3640 void manager_serialize_gid_refs(Manager *m, FILE *f) {
3641 manager_serialize_uid_refs_internal(m, f, &m->gid_refs, "destroy-ipc-gid");
3642 }
3643
3644 static void manager_deserialize_uid_refs_one_internal(
3645 Manager *m,
3646 Hashmap** uid_refs,
3647 const char *value) {
3648
3649 uid_t uid;
3650 uint32_t c;
3651 int r;
3652
3653 assert(m);
3654 assert(uid_refs);
3655 assert(value);
3656
3657 r = parse_uid(value, &uid);
3658 if (r < 0 || uid == 0) {
3659 log_debug("Unable to parse UID reference serialization");
3660 return;
3661 }
3662
3663 r = hashmap_ensure_allocated(uid_refs, &trivial_hash_ops);
3664 if (r < 0) {
3665 log_oom();
3666 return;
3667 }
3668
3669 c = PTR_TO_UINT32(hashmap_get(*uid_refs, UID_TO_PTR(uid)));
3670 if (c & DESTROY_IPC_FLAG)
3671 return;
3672
3673 c |= DESTROY_IPC_FLAG;
3674
3675 r = hashmap_replace(*uid_refs, UID_TO_PTR(uid), UINT32_TO_PTR(c));
3676 if (r < 0) {
3677 log_debug("Failed to add UID reference entry");
3678 return;
3679 }
3680 }
3681
3682 void manager_deserialize_uid_refs_one(Manager *m, const char *value) {
3683 manager_deserialize_uid_refs_one_internal(m, &m->uid_refs, value);
3684 }
3685
3686 void manager_deserialize_gid_refs_one(Manager *m, const char *value) {
3687 manager_deserialize_uid_refs_one_internal(m, &m->gid_refs, value);
3688 }
3689
3690 int manager_dispatch_user_lookup_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
3691 struct buffer {
3692 uid_t uid;
3693 gid_t gid;
3694 char unit_name[UNIT_NAME_MAX+1];
3695 } _packed_ buffer;
3696
3697 Manager *m = userdata;
3698 ssize_t l;
3699 size_t n;
3700 Unit *u;
3701
3702 assert_se(source);
3703 assert_se(m);
3704
3705 /* Invoked whenever a child process succeeded resolving its user/group to use and sent us the resulting UID/GID
3706 * in a datagram. We parse the datagram here and pass it off to the unit, so that it can add a reference to the
3707 * UID/GID so that it can destroy the UID/GID's IPC objects when the reference counter drops to 0. */
3708
3709 l = recv(fd, &buffer, sizeof(buffer), MSG_DONTWAIT);
3710 if (l < 0) {
3711 if (errno == EINTR || errno == EAGAIN)
3712 return 0;
3713
3714 return log_error_errno(errno, "Failed to read from user lookup fd: %m");
3715 }
3716
3717 if ((size_t) l <= offsetof(struct buffer, unit_name)) {
3718 log_warning("Received too short user lookup message, ignoring.");
3719 return 0;
3720 }
3721
3722 if ((size_t) l > offsetof(struct buffer, unit_name) + UNIT_NAME_MAX) {
3723 log_warning("Received too long user lookup message, ignoring.");
3724 return 0;
3725 }
3726
3727 if (!uid_is_valid(buffer.uid) && !gid_is_valid(buffer.gid)) {
3728 log_warning("Got user lookup message with invalid UID/GID pair, ignoring.");
3729 return 0;
3730 }
3731
3732 n = (size_t) l - offsetof(struct buffer, unit_name);
3733 if (memchr(buffer.unit_name, 0, n)) {
3734 log_warning("Received lookup message with embedded NUL character, ignoring.");
3735 return 0;
3736 }
3737
3738 buffer.unit_name[n] = 0;
3739 u = manager_get_unit(m, buffer.unit_name);
3740 if (!u) {
3741 log_debug("Got user lookup message but unit doesn't exist, ignoring.");
3742 return 0;
3743 }
3744
3745 log_unit_debug(u, "User lookup succeeded: uid=" UID_FMT " gid=" GID_FMT, buffer.uid, buffer.gid);
3746
3747 unit_notify_user_lookup(u, buffer.uid, buffer.gid);
3748 return 0;
3749 }
3750
3751 static const char *const manager_state_table[_MANAGER_STATE_MAX] = {
3752 [MANAGER_INITIALIZING] = "initializing",
3753 [MANAGER_STARTING] = "starting",
3754 [MANAGER_RUNNING] = "running",
3755 [MANAGER_DEGRADED] = "degraded",
3756 [MANAGER_MAINTENANCE] = "maintenance",
3757 [MANAGER_STOPPING] = "stopping",
3758 };
3759
3760 DEFINE_STRING_TABLE_LOOKUP(manager_state, ManagerState);
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