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core: change BoundBy= dependency handling to be processed by a deferred work queue
[thirdparty/systemd.git] / src / core / manager.c
1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
2
3 #include <errno.h>
4 #include <fcntl.h>
5 #include <linux/kd.h>
6 #include <sys/epoll.h>
7 #include <sys/inotify.h>
8 #include <sys/ioctl.h>
9 #include <sys/reboot.h>
10 #include <sys/timerfd.h>
11 #include <sys/wait.h>
12 #include <unistd.h>
13
14 #if HAVE_AUDIT
15 #include <libaudit.h>
16 #endif
17
18 #include "sd-daemon.h"
19 #include "sd-messages.h"
20 #include "sd-path.h"
21
22 #include "all-units.h"
23 #include "alloc-util.h"
24 #include "audit-fd.h"
25 #include "boot-timestamps.h"
26 #include "bus-common-errors.h"
27 #include "bus-error.h"
28 #include "bus-kernel.h"
29 #include "bus-util.h"
30 #include "clean-ipc.h"
31 #include "clock-util.h"
32 #include "core-varlink.h"
33 #include "creds-util.h"
34 #include "dbus-job.h"
35 #include "dbus-manager.h"
36 #include "dbus-unit.h"
37 #include "dbus.h"
38 #include "def.h"
39 #include "dirent-util.h"
40 #include "env-util.h"
41 #include "escape.h"
42 #include "exec-util.h"
43 #include "execute.h"
44 #include "exit-status.h"
45 #include "fd-util.h"
46 #include "fileio.h"
47 #include "fs-util.h"
48 #include "generator-setup.h"
49 #include "hashmap.h"
50 #include "install.h"
51 #include "io-util.h"
52 #include "label.h"
53 #include "load-fragment.h"
54 #include "locale-setup.h"
55 #include "log.h"
56 #include "macro.h"
57 #include "manager.h"
58 #include "memory-util.h"
59 #include "mkdir.h"
60 #include "parse-util.h"
61 #include "path-lookup.h"
62 #include "path-util.h"
63 #include "process-util.h"
64 #include "ratelimit.h"
65 #include "rlimit-util.h"
66 #include "rm-rf.h"
67 #include "selinux-util.h"
68 #include "serialize.h"
69 #include "signal-util.h"
70 #include "socket-util.h"
71 #include "special.h"
72 #include "stat-util.h"
73 #include "string-table.h"
74 #include "string-util.h"
75 #include "strv.h"
76 #include "strxcpyx.h"
77 #include "sysctl-util.h"
78 #include "syslog-util.h"
79 #include "terminal-util.h"
80 #include "time-util.h"
81 #include "transaction.h"
82 #include "umask-util.h"
83 #include "unit-name.h"
84 #include "unit-serialize.h"
85 #include "user-util.h"
86 #include "virt.h"
87 #include "watchdog.h"
88
89 #define NOTIFY_RCVBUF_SIZE (8*1024*1024)
90 #define CGROUPS_AGENT_RCVBUF_SIZE (8*1024*1024)
91
92 /* Initial delay and the interval for printing status messages about running jobs */
93 #define JOBS_IN_PROGRESS_WAIT_USEC (2*USEC_PER_SEC)
94 #define JOBS_IN_PROGRESS_QUIET_WAIT_USEC (25*USEC_PER_SEC)
95 #define JOBS_IN_PROGRESS_PERIOD_USEC (USEC_PER_SEC / 3)
96 #define JOBS_IN_PROGRESS_PERIOD_DIVISOR 3
97
98 /* If there are more than 1K bus messages queue across our API and direct buses, then let's not add more on top until
99 * the queue gets more empty. */
100 #define MANAGER_BUS_BUSY_THRESHOLD 1024LU
101
102 /* How many units and jobs to process of the bus queue before returning to the event loop. */
103 #define MANAGER_BUS_MESSAGE_BUDGET 100U
104
105 static int manager_dispatch_notify_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata);
106 static int manager_dispatch_cgroups_agent_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata);
107 static int manager_dispatch_signal_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata);
108 static int manager_dispatch_time_change_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata);
109 static int manager_dispatch_idle_pipe_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata);
110 static int manager_dispatch_user_lookup_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata);
111 static int manager_dispatch_jobs_in_progress(sd_event_source *source, usec_t usec, void *userdata);
112 static int manager_dispatch_run_queue(sd_event_source *source, void *userdata);
113 static int manager_dispatch_sigchld(sd_event_source *source, void *userdata);
114 static int manager_dispatch_timezone_change(sd_event_source *source, const struct inotify_event *event, void *userdata);
115 static int manager_run_environment_generators(Manager *m);
116 static int manager_run_generators(Manager *m);
117 static void manager_vacuum(Manager *m);
118
119 static usec_t manager_watch_jobs_next_time(Manager *m) {
120 return usec_add(now(CLOCK_MONOTONIC),
121 show_status_on(m->show_status) ? JOBS_IN_PROGRESS_WAIT_USEC :
122 JOBS_IN_PROGRESS_QUIET_WAIT_USEC);
123 }
124
125 static void manager_watch_jobs_in_progress(Manager *m) {
126 usec_t next;
127 int r;
128
129 assert(m);
130
131 /* We do not want to show the cylon animation if the user
132 * needs to confirm service executions otherwise confirmation
133 * messages will be screwed by the cylon animation. */
134 if (!manager_is_confirm_spawn_disabled(m))
135 return;
136
137 if (m->jobs_in_progress_event_source)
138 return;
139
140 next = manager_watch_jobs_next_time(m);
141 r = sd_event_add_time(
142 m->event,
143 &m->jobs_in_progress_event_source,
144 CLOCK_MONOTONIC,
145 next, 0,
146 manager_dispatch_jobs_in_progress, m);
147 if (r < 0)
148 return;
149
150 (void) sd_event_source_set_description(m->jobs_in_progress_event_source, "manager-jobs-in-progress");
151 }
152
153 #define CYLON_BUFFER_EXTRA (2*STRLEN(ANSI_RED) + STRLEN(ANSI_HIGHLIGHT_RED) + 2*STRLEN(ANSI_NORMAL))
154
155 static void draw_cylon(char buffer[], size_t buflen, unsigned width, unsigned pos) {
156 char *p = buffer;
157
158 assert(buflen >= CYLON_BUFFER_EXTRA + width + 1);
159 assert(pos <= width+1); /* 0 or width+1 mean that the center light is behind the corner */
160
161 if (pos > 1) {
162 if (pos > 2)
163 p = mempset(p, ' ', pos-2);
164 if (log_get_show_color())
165 p = stpcpy(p, ANSI_RED);
166 *p++ = '*';
167 }
168
169 if (pos > 0 && pos <= width) {
170 if (log_get_show_color())
171 p = stpcpy(p, ANSI_HIGHLIGHT_RED);
172 *p++ = '*';
173 }
174
175 if (log_get_show_color())
176 p = stpcpy(p, ANSI_NORMAL);
177
178 if (pos < width) {
179 if (log_get_show_color())
180 p = stpcpy(p, ANSI_RED);
181 *p++ = '*';
182 if (pos < width-1)
183 p = mempset(p, ' ', width-1-pos);
184 if (log_get_show_color())
185 strcpy(p, ANSI_NORMAL);
186 }
187 }
188
189 static void manager_flip_auto_status(Manager *m, bool enable, const char *reason) {
190 assert(m);
191
192 if (enable) {
193 if (m->show_status == SHOW_STATUS_AUTO)
194 manager_set_show_status(m, SHOW_STATUS_TEMPORARY, reason);
195 } else {
196 if (m->show_status == SHOW_STATUS_TEMPORARY)
197 manager_set_show_status(m, SHOW_STATUS_AUTO, reason);
198 }
199 }
200
201 static void manager_print_jobs_in_progress(Manager *m) {
202 _cleanup_free_ char *job_of_n = NULL;
203 Job *j;
204 unsigned counter = 0, print_nr;
205 char cylon[6 + CYLON_BUFFER_EXTRA + 1];
206 unsigned cylon_pos;
207 char time[FORMAT_TIMESPAN_MAX], limit[FORMAT_TIMESPAN_MAX] = "no limit";
208 uint64_t x;
209
210 assert(m);
211 assert(m->n_running_jobs > 0);
212
213 manager_flip_auto_status(m, true, "delay");
214
215 print_nr = (m->jobs_in_progress_iteration / JOBS_IN_PROGRESS_PERIOD_DIVISOR) % m->n_running_jobs;
216
217 HASHMAP_FOREACH(j, m->jobs)
218 if (j->state == JOB_RUNNING && counter++ == print_nr)
219 break;
220
221 /* m->n_running_jobs must be consistent with the contents of m->jobs,
222 * so the above loop must have succeeded in finding j. */
223 assert(counter == print_nr + 1);
224 assert(j);
225
226 cylon_pos = m->jobs_in_progress_iteration % 14;
227 if (cylon_pos >= 8)
228 cylon_pos = 14 - cylon_pos;
229 draw_cylon(cylon, sizeof(cylon), 6, cylon_pos);
230
231 m->jobs_in_progress_iteration++;
232
233 if (m->n_running_jobs > 1) {
234 if (asprintf(&job_of_n, "(%u of %u) ", counter, m->n_running_jobs) < 0)
235 job_of_n = NULL;
236 }
237
238 format_timespan(time, sizeof(time), now(CLOCK_MONOTONIC) - j->begin_usec, 1*USEC_PER_SEC);
239 if (job_get_timeout(j, &x) > 0)
240 format_timespan(limit, sizeof(limit), x - j->begin_usec, 1*USEC_PER_SEC);
241
242 manager_status_printf(m, STATUS_TYPE_EPHEMERAL, cylon,
243 "%sA %s job is running for %s (%s / %s)",
244 strempty(job_of_n),
245 job_type_to_string(j->type),
246 unit_status_string(j->unit),
247 time, limit);
248 }
249
250 static int have_ask_password(void) {
251 _cleanup_closedir_ DIR *dir = NULL;
252 struct dirent *de;
253
254 dir = opendir("/run/systemd/ask-password");
255 if (!dir) {
256 if (errno == ENOENT)
257 return false;
258 else
259 return -errno;
260 }
261
262 FOREACH_DIRENT_ALL(de, dir, return -errno) {
263 if (startswith(de->d_name, "ask."))
264 return true;
265 }
266 return false;
267 }
268
269 static int manager_dispatch_ask_password_fd(sd_event_source *source,
270 int fd, uint32_t revents, void *userdata) {
271 Manager *m = userdata;
272
273 assert(m);
274
275 (void) flush_fd(fd);
276
277 m->have_ask_password = have_ask_password();
278 if (m->have_ask_password < 0)
279 /* Log error but continue. Negative have_ask_password
280 * is treated as unknown status. */
281 log_error_errno(m->have_ask_password, "Failed to list /run/systemd/ask-password: %m");
282
283 return 0;
284 }
285
286 static void manager_close_ask_password(Manager *m) {
287 assert(m);
288
289 m->ask_password_event_source = sd_event_source_unref(m->ask_password_event_source);
290 m->ask_password_inotify_fd = safe_close(m->ask_password_inotify_fd);
291 m->have_ask_password = -EINVAL;
292 }
293
294 static int manager_check_ask_password(Manager *m) {
295 int r;
296
297 assert(m);
298
299 if (!m->ask_password_event_source) {
300 assert(m->ask_password_inotify_fd < 0);
301
302 (void) mkdir_p_label("/run/systemd/ask-password", 0755);
303
304 m->ask_password_inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
305 if (m->ask_password_inotify_fd < 0)
306 return log_error_errno(errno, "Failed to create inotify object: %m");
307
308 r = inotify_add_watch_and_warn(m->ask_password_inotify_fd,
309 "/run/systemd/ask-password",
310 IN_CREATE|IN_DELETE|IN_MOVE);
311 if (r < 0) {
312 manager_close_ask_password(m);
313 return r;
314 }
315
316 r = sd_event_add_io(m->event, &m->ask_password_event_source,
317 m->ask_password_inotify_fd, EPOLLIN,
318 manager_dispatch_ask_password_fd, m);
319 if (r < 0) {
320 log_error_errno(r, "Failed to add event source for /run/systemd/ask-password: %m");
321 manager_close_ask_password(m);
322 return r;
323 }
324
325 (void) sd_event_source_set_description(m->ask_password_event_source, "manager-ask-password");
326
327 /* Queries might have been added meanwhile... */
328 manager_dispatch_ask_password_fd(m->ask_password_event_source,
329 m->ask_password_inotify_fd, EPOLLIN, m);
330 }
331
332 return m->have_ask_password;
333 }
334
335 static int manager_watch_idle_pipe(Manager *m) {
336 int r;
337
338 assert(m);
339
340 if (m->idle_pipe_event_source)
341 return 0;
342
343 if (m->idle_pipe[2] < 0)
344 return 0;
345
346 r = sd_event_add_io(m->event, &m->idle_pipe_event_source, m->idle_pipe[2], EPOLLIN, manager_dispatch_idle_pipe_fd, m);
347 if (r < 0)
348 return log_error_errno(r, "Failed to watch idle pipe: %m");
349
350 (void) sd_event_source_set_description(m->idle_pipe_event_source, "manager-idle-pipe");
351
352 return 0;
353 }
354
355 static void manager_close_idle_pipe(Manager *m) {
356 assert(m);
357
358 m->idle_pipe_event_source = sd_event_source_unref(m->idle_pipe_event_source);
359
360 safe_close_pair(m->idle_pipe);
361 safe_close_pair(m->idle_pipe + 2);
362 }
363
364 static int manager_setup_time_change(Manager *m) {
365 int r;
366
367 assert(m);
368
369 if (MANAGER_IS_TEST_RUN(m))
370 return 0;
371
372 m->time_change_event_source = sd_event_source_unref(m->time_change_event_source);
373 m->time_change_fd = safe_close(m->time_change_fd);
374
375 m->time_change_fd = time_change_fd();
376 if (m->time_change_fd < 0)
377 return log_error_errno(m->time_change_fd, "Failed to create timer change timer fd: %m");
378
379 r = sd_event_add_io(m->event, &m->time_change_event_source, m->time_change_fd, EPOLLIN, manager_dispatch_time_change_fd, m);
380 if (r < 0)
381 return log_error_errno(r, "Failed to create time change event source: %m");
382
383 /* Schedule this slightly earlier than the .timer event sources */
384 r = sd_event_source_set_priority(m->time_change_event_source, SD_EVENT_PRIORITY_NORMAL-1);
385 if (r < 0)
386 return log_error_errno(r, "Failed to set priority of time change event sources: %m");
387
388 (void) sd_event_source_set_description(m->time_change_event_source, "manager-time-change");
389
390 log_debug("Set up TFD_TIMER_CANCEL_ON_SET timerfd.");
391
392 return 0;
393 }
394
395 static int manager_read_timezone_stat(Manager *m) {
396 struct stat st;
397 bool changed;
398
399 assert(m);
400
401 /* Read the current stat() data of /etc/localtime so that we detect changes */
402 if (lstat("/etc/localtime", &st) < 0) {
403 log_debug_errno(errno, "Failed to stat /etc/localtime, ignoring: %m");
404 changed = m->etc_localtime_accessible;
405 m->etc_localtime_accessible = false;
406 } else {
407 usec_t k;
408
409 k = timespec_load(&st.st_mtim);
410 changed = !m->etc_localtime_accessible || k != m->etc_localtime_mtime;
411
412 m->etc_localtime_mtime = k;
413 m->etc_localtime_accessible = true;
414 }
415
416 return changed;
417 }
418
419 static int manager_setup_timezone_change(Manager *m) {
420 _cleanup_(sd_event_source_unrefp) sd_event_source *new_event = NULL;
421 int r;
422
423 assert(m);
424
425 if (MANAGER_IS_TEST_RUN(m))
426 return 0;
427
428 /* We watch /etc/localtime for three events: change of the link count (which might mean removal from /etc even
429 * though another link might be kept), renames, and file close operations after writing. Note we don't bother
430 * with IN_DELETE_SELF, as that would just report when the inode is removed entirely, i.e. after the link count
431 * went to zero and all fds to it are closed.
432 *
433 * Note that we never follow symlinks here. This is a simplification, but should cover almost all cases
434 * correctly.
435 *
436 * Note that we create the new event source first here, before releasing the old one. This should optimize
437 * behaviour as this way sd-event can reuse the old watch in case the inode didn't change. */
438
439 r = sd_event_add_inotify(m->event, &new_event, "/etc/localtime",
440 IN_ATTRIB|IN_MOVE_SELF|IN_CLOSE_WRITE|IN_DONT_FOLLOW, manager_dispatch_timezone_change, m);
441 if (r == -ENOENT) {
442 /* If the file doesn't exist yet, subscribe to /etc instead, and wait until it is created either by
443 * O_CREATE or by rename() */
444
445 log_debug_errno(r, "/etc/localtime doesn't exist yet, watching /etc instead.");
446 r = sd_event_add_inotify(m->event, &new_event, "/etc",
447 IN_CREATE|IN_MOVED_TO|IN_ONLYDIR, manager_dispatch_timezone_change, m);
448 }
449 if (r < 0)
450 return log_error_errno(r, "Failed to create timezone change event source: %m");
451
452 /* Schedule this slightly earlier than the .timer event sources */
453 r = sd_event_source_set_priority(new_event, SD_EVENT_PRIORITY_NORMAL-1);
454 if (r < 0)
455 return log_error_errno(r, "Failed to set priority of timezone change event sources: %m");
456
457 sd_event_source_unref(m->timezone_change_event_source);
458 m->timezone_change_event_source = TAKE_PTR(new_event);
459
460 return 0;
461 }
462
463 static int enable_special_signals(Manager *m) {
464 _cleanup_close_ int fd = -1;
465
466 assert(m);
467
468 if (MANAGER_IS_TEST_RUN(m))
469 return 0;
470
471 /* Enable that we get SIGINT on control-alt-del. In containers
472 * this will fail with EPERM (older) or EINVAL (newer), so
473 * ignore that. */
474 if (reboot(RB_DISABLE_CAD) < 0 && !IN_SET(errno, EPERM, EINVAL))
475 log_warning_errno(errno, "Failed to enable ctrl-alt-del handling: %m");
476
477 fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC);
478 if (fd < 0) {
479 /* Support systems without virtual console */
480 if (fd != -ENOENT)
481 log_warning_errno(errno, "Failed to open /dev/tty0: %m");
482 } else {
483 /* Enable that we get SIGWINCH on kbrequest */
484 if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0)
485 log_warning_errno(errno, "Failed to enable kbrequest handling: %m");
486 }
487
488 return 0;
489 }
490
491 #define RTSIG_IF_AVAILABLE(signum) (signum <= SIGRTMAX ? signum : -1)
492
493 static int manager_setup_signals(Manager *m) {
494 struct sigaction sa = {
495 .sa_handler = SIG_DFL,
496 .sa_flags = SA_NOCLDSTOP|SA_RESTART,
497 };
498 sigset_t mask;
499 int r;
500
501 assert(m);
502
503 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
504
505 /* We make liberal use of realtime signals here. On
506 * Linux/glibc we have 30 of them (with the exception of Linux
507 * on hppa, see below), between SIGRTMIN+0 ... SIGRTMIN+30
508 * (aka SIGRTMAX). */
509
510 assert_se(sigemptyset(&mask) == 0);
511 sigset_add_many(&mask,
512 SIGCHLD, /* Child died */
513 SIGTERM, /* Reexecute daemon */
514 SIGHUP, /* Reload configuration */
515 SIGUSR1, /* systemd: reconnect to D-Bus */
516 SIGUSR2, /* systemd: dump status */
517 SIGINT, /* Kernel sends us this on control-alt-del */
518 SIGWINCH, /* Kernel sends us this on kbrequest (alt-arrowup) */
519 SIGPWR, /* Some kernel drivers and upsd send us this on power failure */
520
521 SIGRTMIN+0, /* systemd: start default.target */
522 SIGRTMIN+1, /* systemd: isolate rescue.target */
523 SIGRTMIN+2, /* systemd: isolate emergency.target */
524 SIGRTMIN+3, /* systemd: start halt.target */
525 SIGRTMIN+4, /* systemd: start poweroff.target */
526 SIGRTMIN+5, /* systemd: start reboot.target */
527 SIGRTMIN+6, /* systemd: start kexec.target */
528
529 /* ... space for more special targets ... */
530
531 SIGRTMIN+13, /* systemd: Immediate halt */
532 SIGRTMIN+14, /* systemd: Immediate poweroff */
533 SIGRTMIN+15, /* systemd: Immediate reboot */
534 SIGRTMIN+16, /* systemd: Immediate kexec */
535
536 /* ... space for more immediate system state changes ... */
537
538 SIGRTMIN+20, /* systemd: enable status messages */
539 SIGRTMIN+21, /* systemd: disable status messages */
540 SIGRTMIN+22, /* systemd: set log level to LOG_DEBUG */
541 SIGRTMIN+23, /* systemd: set log level to LOG_INFO */
542 SIGRTMIN+24, /* systemd: Immediate exit (--user only) */
543
544 /* .. one free signal here ... */
545
546 /* Apparently Linux on hppa had fewer RT signals until v3.18,
547 * SIGRTMAX was SIGRTMIN+25, and then SIGRTMIN was lowered,
548 * see commit v3.17-7614-g1f25df2eff.
549 *
550 * We cannot unconditionally make use of those signals here,
551 * so let's use a runtime check. Since these commands are
552 * accessible by different means and only really a safety
553 * net, the missing functionality on hppa shouldn't matter.
554 */
555
556 RTSIG_IF_AVAILABLE(SIGRTMIN+26), /* systemd: set log target to journal-or-kmsg */
557 RTSIG_IF_AVAILABLE(SIGRTMIN+27), /* systemd: set log target to console */
558 RTSIG_IF_AVAILABLE(SIGRTMIN+28), /* systemd: set log target to kmsg */
559 RTSIG_IF_AVAILABLE(SIGRTMIN+29), /* systemd: set log target to syslog-or-kmsg (obsolete) */
560
561 /* ... one free signal here SIGRTMIN+30 ... */
562 -1);
563 assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
564
565 m->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
566 if (m->signal_fd < 0)
567 return -errno;
568
569 r = sd_event_add_io(m->event, &m->signal_event_source, m->signal_fd, EPOLLIN, manager_dispatch_signal_fd, m);
570 if (r < 0)
571 return r;
572
573 (void) sd_event_source_set_description(m->signal_event_source, "manager-signal");
574
575 /* Process signals a bit earlier than the rest of things, but later than notify_fd processing, so that the
576 * notify processing can still figure out to which process/service a message belongs, before we reap the
577 * process. Also, process this before handling cgroup notifications, so that we always collect child exit
578 * status information before detecting that there's no process in a cgroup. */
579 r = sd_event_source_set_priority(m->signal_event_source, SD_EVENT_PRIORITY_NORMAL-6);
580 if (r < 0)
581 return r;
582
583 if (MANAGER_IS_SYSTEM(m))
584 return enable_special_signals(m);
585
586 return 0;
587 }
588
589 static char** sanitize_environment(char **l) {
590
591 /* Let's remove some environment variables that we need ourselves to communicate with our clients */
592 strv_env_unset_many(
593 l,
594 "CACHE_DIRECTORY",
595 "CONFIGURATION_DIRECTORY",
596 "CREDENTIALS_DIRECTORY",
597 "EXIT_CODE",
598 "EXIT_STATUS",
599 "INVOCATION_ID",
600 "JOURNAL_STREAM",
601 "LISTEN_FDNAMES",
602 "LISTEN_FDS",
603 "LISTEN_PID",
604 "LOGS_DIRECTORY",
605 "MAINPID",
606 "MANAGERPID",
607 "NOTIFY_SOCKET",
608 "PIDFILE",
609 "REMOTE_ADDR",
610 "REMOTE_PORT",
611 "RUNTIME_DIRECTORY",
612 "SERVICE_RESULT",
613 "STATE_DIRECTORY",
614 "WATCHDOG_PID",
615 "WATCHDOG_USEC",
616 NULL);
617
618 /* Let's order the environment alphabetically, just to make it pretty */
619 strv_sort(l);
620
621 return l;
622 }
623
624 int manager_default_environment(Manager *m) {
625 int r;
626
627 assert(m);
628
629 m->transient_environment = strv_free(m->transient_environment);
630
631 if (MANAGER_IS_SYSTEM(m)) {
632 /* The system manager always starts with a clean
633 * environment for its children. It does not import
634 * the kernel's or the parents' exported variables.
635 *
636 * The initial passed environment is untouched to keep
637 * /proc/self/environ valid; it is used for tagging
638 * the init process inside containers. */
639 m->transient_environment = strv_new("PATH=" DEFAULT_PATH);
640 if (!m->transient_environment)
641 return log_oom();
642
643 /* Import locale variables LC_*= from configuration */
644 (void) locale_setup(&m->transient_environment);
645 } else {
646 /* The user manager passes its own environment along to its children, except for $PATH. */
647 m->transient_environment = strv_copy(environ);
648 if (!m->transient_environment)
649 return log_oom();
650
651 r = strv_env_replace_strdup(&m->transient_environment, "PATH=" DEFAULT_USER_PATH);
652 if (r < 0)
653 return log_oom();
654 }
655
656 sanitize_environment(m->transient_environment);
657
658 return 0;
659 }
660
661 static int manager_setup_prefix(Manager *m) {
662 struct table_entry {
663 uint64_t type;
664 const char *suffix;
665 };
666
667 static const struct table_entry paths_system[_EXEC_DIRECTORY_TYPE_MAX] = {
668 [EXEC_DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME, NULL },
669 [EXEC_DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE, NULL },
670 [EXEC_DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE, NULL },
671 [EXEC_DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS, NULL },
672 [EXEC_DIRECTORY_CONFIGURATION] = { SD_PATH_SYSTEM_CONFIGURATION, NULL },
673 };
674
675 static const struct table_entry paths_user[_EXEC_DIRECTORY_TYPE_MAX] = {
676 [EXEC_DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME, NULL },
677 [EXEC_DIRECTORY_STATE] = { SD_PATH_USER_CONFIGURATION, NULL },
678 [EXEC_DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE, NULL },
679 [EXEC_DIRECTORY_LOGS] = { SD_PATH_USER_CONFIGURATION, "log" },
680 [EXEC_DIRECTORY_CONFIGURATION] = { SD_PATH_USER_CONFIGURATION, NULL },
681 };
682
683 assert(m);
684
685 const struct table_entry *p = MANAGER_IS_SYSTEM(m) ? paths_system : paths_user;
686 int r;
687
688 for (ExecDirectoryType i = 0; i < _EXEC_DIRECTORY_TYPE_MAX; i++) {
689 r = sd_path_lookup(p[i].type, p[i].suffix, &m->prefix[i]);
690 if (r < 0)
691 return log_warning_errno(r, "Failed to lookup %s path: %m",
692 exec_directory_type_to_string(i));
693 }
694
695 return 0;
696 }
697
698 static void manager_free_unit_name_maps(Manager *m) {
699 m->unit_id_map = hashmap_free(m->unit_id_map);
700 m->unit_name_map = hashmap_free(m->unit_name_map);
701 m->unit_path_cache = set_free(m->unit_path_cache);
702 m->unit_cache_timestamp_hash = 0;
703 }
704
705 static int manager_setup_run_queue(Manager *m) {
706 int r;
707
708 assert(m);
709 assert(!m->run_queue_event_source);
710
711 r = sd_event_add_defer(m->event, &m->run_queue_event_source, manager_dispatch_run_queue, m);
712 if (r < 0)
713 return r;
714
715 r = sd_event_source_set_priority(m->run_queue_event_source, SD_EVENT_PRIORITY_IDLE);
716 if (r < 0)
717 return r;
718
719 r = sd_event_source_set_enabled(m->run_queue_event_source, SD_EVENT_OFF);
720 if (r < 0)
721 return r;
722
723 (void) sd_event_source_set_description(m->run_queue_event_source, "manager-run-queue");
724
725 return 0;
726 }
727
728 static int manager_setup_sigchld_event_source(Manager *m) {
729 int r;
730
731 assert(m);
732 assert(!m->sigchld_event_source);
733
734 r = sd_event_add_defer(m->event, &m->sigchld_event_source, manager_dispatch_sigchld, m);
735 if (r < 0)
736 return r;
737
738 r = sd_event_source_set_priority(m->sigchld_event_source, SD_EVENT_PRIORITY_NORMAL-7);
739 if (r < 0)
740 return r;
741
742 r = sd_event_source_set_enabled(m->sigchld_event_source, SD_EVENT_OFF);
743 if (r < 0)
744 return r;
745
746 (void) sd_event_source_set_description(m->sigchld_event_source, "manager-sigchld");
747
748 return 0;
749 }
750
751 int manager_new(UnitFileScope scope, ManagerTestRunFlags test_run_flags, Manager **_m) {
752 _cleanup_(manager_freep) Manager *m = NULL;
753 const char *e;
754 int r;
755
756 assert(_m);
757 assert(IN_SET(scope, UNIT_FILE_SYSTEM, UNIT_FILE_USER));
758
759 m = new(Manager, 1);
760 if (!m)
761 return -ENOMEM;
762
763 *m = (Manager) {
764 .unit_file_scope = scope,
765 .objective = _MANAGER_OBJECTIVE_INVALID,
766
767 .status_unit_format = STATUS_UNIT_FORMAT_DEFAULT,
768
769 .default_timer_accuracy_usec = USEC_PER_MINUTE,
770 .default_memory_accounting = MEMORY_ACCOUNTING_DEFAULT,
771 .default_tasks_accounting = true,
772 .default_tasks_max = TASKS_MAX_UNSET,
773 .default_timeout_start_usec = DEFAULT_TIMEOUT_USEC,
774 .default_timeout_stop_usec = DEFAULT_TIMEOUT_USEC,
775 .default_restart_usec = DEFAULT_RESTART_USEC,
776
777 .original_log_level = -1,
778 .original_log_target = _LOG_TARGET_INVALID,
779
780 .watchdog_overridden[WATCHDOG_RUNTIME] = USEC_INFINITY,
781 .watchdog_overridden[WATCHDOG_REBOOT] = USEC_INFINITY,
782 .watchdog_overridden[WATCHDOG_KEXEC] = USEC_INFINITY,
783
784 .show_status_overridden = _SHOW_STATUS_INVALID,
785
786 .notify_fd = -1,
787 .cgroups_agent_fd = -1,
788 .signal_fd = -1,
789 .time_change_fd = -1,
790 .user_lookup_fds = { -1, -1 },
791 .private_listen_fd = -1,
792 .dev_autofs_fd = -1,
793 .cgroup_inotify_fd = -1,
794 .pin_cgroupfs_fd = -1,
795 .ask_password_inotify_fd = -1,
796 .idle_pipe = { -1, -1, -1, -1},
797
798 /* start as id #1, so that we can leave #0 around as "null-like" value */
799 .current_job_id = 1,
800
801 .have_ask_password = -EINVAL, /* we don't know */
802 .first_boot = -1,
803 .test_run_flags = test_run_flags,
804
805 .default_oom_policy = OOM_STOP,
806 };
807
808 #if ENABLE_EFI
809 if (MANAGER_IS_SYSTEM(m) && detect_container() <= 0)
810 boot_timestamps(m->timestamps + MANAGER_TIMESTAMP_USERSPACE,
811 m->timestamps + MANAGER_TIMESTAMP_FIRMWARE,
812 m->timestamps + MANAGER_TIMESTAMP_LOADER);
813 #endif
814
815 /* Prepare log fields we can use for structured logging */
816 if (MANAGER_IS_SYSTEM(m)) {
817 m->unit_log_field = "UNIT=";
818 m->unit_log_format_string = "UNIT=%s";
819
820 m->invocation_log_field = "INVOCATION_ID=";
821 m->invocation_log_format_string = "INVOCATION_ID=%s";
822 } else {
823 m->unit_log_field = "USER_UNIT=";
824 m->unit_log_format_string = "USER_UNIT=%s";
825
826 m->invocation_log_field = "USER_INVOCATION_ID=";
827 m->invocation_log_format_string = "USER_INVOCATION_ID=%s";
828 }
829
830 /* Reboot immediately if the user hits C-A-D more often than 7x per 2s */
831 m->ctrl_alt_del_ratelimit = (RateLimit) { .interval = 2 * USEC_PER_SEC, .burst = 7 };
832
833 r = manager_default_environment(m);
834 if (r < 0)
835 return r;
836
837 r = hashmap_ensure_allocated(&m->units, &string_hash_ops);
838 if (r < 0)
839 return r;
840
841 r = hashmap_ensure_allocated(&m->cgroup_unit, &path_hash_ops);
842 if (r < 0)
843 return r;
844
845 r = hashmap_ensure_allocated(&m->watch_bus, &string_hash_ops);
846 if (r < 0)
847 return r;
848
849 r = prioq_ensure_allocated(&m->run_queue, compare_job_priority);
850 if (r < 0)
851 return r;
852
853 r = manager_setup_prefix(m);
854 if (r < 0)
855 return r;
856
857 r = get_credentials_dir(&e);
858 if (r >= 0) {
859 m->received_credentials = strdup(e);
860 if (!m->received_credentials)
861 return -ENOMEM;
862 }
863
864 r = sd_event_default(&m->event);
865 if (r < 0)
866 return r;
867
868 r = manager_setup_run_queue(m);
869 if (r < 0)
870 return r;
871
872 if (test_run_flags == MANAGER_TEST_RUN_MINIMAL) {
873 m->cgroup_root = strdup("");
874 if (!m->cgroup_root)
875 return -ENOMEM;
876 } else {
877 r = manager_setup_signals(m);
878 if (r < 0)
879 return r;
880
881 r = manager_setup_cgroup(m);
882 if (r < 0)
883 return r;
884
885 r = manager_setup_time_change(m);
886 if (r < 0)
887 return r;
888
889 r = manager_read_timezone_stat(m);
890 if (r < 0)
891 return r;
892
893 (void) manager_setup_timezone_change(m);
894
895 r = manager_setup_sigchld_event_source(m);
896 if (r < 0)
897 return r;
898 }
899
900 if (test_run_flags == 0) {
901 if (MANAGER_IS_SYSTEM(m))
902 r = mkdir_label("/run/systemd/units", 0755);
903 else {
904 _cleanup_free_ char *units_path = NULL;
905 r = xdg_user_runtime_dir(&units_path, "/systemd/units");
906 if (r < 0)
907 return r;
908 r = mkdir_p_label(units_path, 0755);
909 }
910
911 if (r < 0 && r != -EEXIST)
912 return r;
913 }
914
915 m->taint_usr =
916 !in_initrd() &&
917 dir_is_empty("/usr") > 0;
918
919 /* Note that we do not set up the notify fd here. We do that after deserialization,
920 * since they might have gotten serialized across the reexec. */
921
922 *_m = TAKE_PTR(m);
923
924 return 0;
925 }
926
927 static int manager_setup_notify(Manager *m) {
928 int r;
929
930 if (MANAGER_IS_TEST_RUN(m))
931 return 0;
932
933 if (m->notify_fd < 0) {
934 _cleanup_close_ int fd = -1;
935 union sockaddr_union sa;
936 socklen_t sa_len;
937
938 /* First free all secondary fields */
939 m->notify_socket = mfree(m->notify_socket);
940 m->notify_event_source = sd_event_source_unref(m->notify_event_source);
941
942 fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
943 if (fd < 0)
944 return log_error_errno(errno, "Failed to allocate notification socket: %m");
945
946 fd_inc_rcvbuf(fd, NOTIFY_RCVBUF_SIZE);
947
948 m->notify_socket = path_join(m->prefix[EXEC_DIRECTORY_RUNTIME], "systemd/notify");
949 if (!m->notify_socket)
950 return log_oom();
951
952 r = sockaddr_un_set_path(&sa.un, m->notify_socket);
953 if (r < 0)
954 return log_error_errno(r, "Notify socket '%s' not valid for AF_UNIX socket address, refusing.",
955 m->notify_socket);
956 sa_len = r;
957
958 (void) mkdir_parents_label(m->notify_socket, 0755);
959 (void) sockaddr_un_unlink(&sa.un);
960
961 r = mac_selinux_bind(fd, &sa.sa, sa_len);
962 if (r < 0)
963 return log_error_errno(r, "bind(%s) failed: %m", m->notify_socket);
964
965 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true);
966 if (r < 0)
967 return log_error_errno(r, "SO_PASSCRED failed: %m");
968
969 m->notify_fd = TAKE_FD(fd);
970
971 log_debug("Using notification socket %s", m->notify_socket);
972 }
973
974 if (!m->notify_event_source) {
975 r = sd_event_add_io(m->event, &m->notify_event_source, m->notify_fd, EPOLLIN, manager_dispatch_notify_fd, m);
976 if (r < 0)
977 return log_error_errno(r, "Failed to allocate notify event source: %m");
978
979 /* Process notification messages a bit earlier than SIGCHLD, so that we can still identify to which
980 * service an exit message belongs. */
981 r = sd_event_source_set_priority(m->notify_event_source, SD_EVENT_PRIORITY_NORMAL-8);
982 if (r < 0)
983 return log_error_errno(r, "Failed to set priority of notify event source: %m");
984
985 (void) sd_event_source_set_description(m->notify_event_source, "manager-notify");
986 }
987
988 return 0;
989 }
990
991 static int manager_setup_cgroups_agent(Manager *m) {
992
993 static const union sockaddr_union sa = {
994 .un.sun_family = AF_UNIX,
995 .un.sun_path = "/run/systemd/cgroups-agent",
996 };
997 int r;
998
999 /* This creates a listening socket we receive cgroups agent messages on. We do not use D-Bus for delivering
1000 * these messages from the cgroups agent binary to PID 1, as the cgroups agent binary is very short-living, and
1001 * each instance of it needs a new D-Bus connection. Since D-Bus connections are SOCK_STREAM/AF_UNIX, on
1002 * overloaded systems the backlog of the D-Bus socket becomes relevant, as not more than the configured number
1003 * of D-Bus connections may be queued until the kernel will start dropping further incoming connections,
1004 * possibly resulting in lost cgroups agent messages. To avoid this, we'll use a private SOCK_DGRAM/AF_UNIX
1005 * socket, where no backlog is relevant as communication may take place without an actual connect() cycle, and
1006 * we thus won't lose messages.
1007 *
1008 * Note that PID 1 will forward the agent message to system bus, so that the user systemd instance may listen
1009 * to it. The system instance hence listens on this special socket, but the user instances listen on the system
1010 * bus for these messages. */
1011
1012 if (MANAGER_IS_TEST_RUN(m))
1013 return 0;
1014
1015 if (!MANAGER_IS_SYSTEM(m))
1016 return 0;
1017
1018 r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER);
1019 if (r < 0)
1020 return log_error_errno(r, "Failed to determine whether unified cgroups hierarchy is used: %m");
1021 if (r > 0) /* We don't need this anymore on the unified hierarchy */
1022 return 0;
1023
1024 if (m->cgroups_agent_fd < 0) {
1025 _cleanup_close_ int fd = -1;
1026
1027 /* First free all secondary fields */
1028 m->cgroups_agent_event_source = sd_event_source_unref(m->cgroups_agent_event_source);
1029
1030 fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
1031 if (fd < 0)
1032 return log_error_errno(errno, "Failed to allocate cgroups agent socket: %m");
1033
1034 fd_inc_rcvbuf(fd, CGROUPS_AGENT_RCVBUF_SIZE);
1035
1036 (void) sockaddr_un_unlink(&sa.un);
1037
1038 /* Only allow root to connect to this socket */
1039 RUN_WITH_UMASK(0077)
1040 r = bind(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un));
1041 if (r < 0)
1042 return log_error_errno(errno, "bind(%s) failed: %m", sa.un.sun_path);
1043
1044 m->cgroups_agent_fd = TAKE_FD(fd);
1045 }
1046
1047 if (!m->cgroups_agent_event_source) {
1048 r = sd_event_add_io(m->event, &m->cgroups_agent_event_source, m->cgroups_agent_fd, EPOLLIN, manager_dispatch_cgroups_agent_fd, m);
1049 if (r < 0)
1050 return log_error_errno(r, "Failed to allocate cgroups agent event source: %m");
1051
1052 /* Process cgroups notifications early. Note that when the agent notification is received
1053 * we'll just enqueue the unit in the cgroup empty queue, hence pick a high priority than
1054 * that. Also see handling of cgroup inotify for the unified cgroup stuff. */
1055 r = sd_event_source_set_priority(m->cgroups_agent_event_source, SD_EVENT_PRIORITY_NORMAL-9);
1056 if (r < 0)
1057 return log_error_errno(r, "Failed to set priority of cgroups agent event source: %m");
1058
1059 (void) sd_event_source_set_description(m->cgroups_agent_event_source, "manager-cgroups-agent");
1060 }
1061
1062 return 0;
1063 }
1064
1065 static int manager_setup_user_lookup_fd(Manager *m) {
1066 int r;
1067
1068 assert(m);
1069
1070 /* Set up the socket pair used for passing UID/GID resolution results from forked off processes to PID
1071 * 1. Background: we can't do name lookups (NSS) from PID 1, since it might involve IPC and thus activation,
1072 * and we might hence deadlock on ourselves. Hence we do all user/group lookups asynchronously from the forked
1073 * off processes right before executing the binaries to start. In order to be able to clean up any IPC objects
1074 * created by a unit (see RemoveIPC=) we need to know in PID 1 the used UID/GID of the executed processes,
1075 * hence we establish this communication channel so that forked off processes can pass their UID/GID
1076 * information back to PID 1. The forked off processes send their resolved UID/GID to PID 1 in a simple
1077 * datagram, along with their unit name, so that we can share one communication socket pair among all units for
1078 * this purpose.
1079 *
1080 * You might wonder why we need a communication channel for this that is independent of the usual notification
1081 * socket scheme (i.e. $NOTIFY_SOCKET). The primary difference is about trust: data sent via the $NOTIFY_SOCKET
1082 * channel is only accepted if it originates from the right unit and if reception was enabled for it. The user
1083 * lookup socket OTOH is only accessible by PID 1 and its children until they exec(), and always available.
1084 *
1085 * Note that this function is called under two circumstances: when we first initialize (in which case we
1086 * allocate both the socket pair and the event source to listen on it), and when we deserialize after a reload
1087 * (in which case the socket pair already exists but we still need to allocate the event source for it). */
1088
1089 if (m->user_lookup_fds[0] < 0) {
1090
1091 /* Free all secondary fields */
1092 safe_close_pair(m->user_lookup_fds);
1093 m->user_lookup_event_source = sd_event_source_unref(m->user_lookup_event_source);
1094
1095 if (socketpair(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, m->user_lookup_fds) < 0)
1096 return log_error_errno(errno, "Failed to allocate user lookup socket: %m");
1097
1098 (void) fd_inc_rcvbuf(m->user_lookup_fds[0], NOTIFY_RCVBUF_SIZE);
1099 }
1100
1101 if (!m->user_lookup_event_source) {
1102 r = sd_event_add_io(m->event, &m->user_lookup_event_source, m->user_lookup_fds[0], EPOLLIN, manager_dispatch_user_lookup_fd, m);
1103 if (r < 0)
1104 return log_error_errno(errno, "Failed to allocate user lookup event source: %m");
1105
1106 /* Process even earlier than the notify event source, so that we always know first about valid UID/GID
1107 * resolutions */
1108 r = sd_event_source_set_priority(m->user_lookup_event_source, SD_EVENT_PRIORITY_NORMAL-11);
1109 if (r < 0)
1110 return log_error_errno(errno, "Failed to set priority of user lookup event source: %m");
1111
1112 (void) sd_event_source_set_description(m->user_lookup_event_source, "user-lookup");
1113 }
1114
1115 return 0;
1116 }
1117
1118 static unsigned manager_dispatch_cleanup_queue(Manager *m) {
1119 Unit *u;
1120 unsigned n = 0;
1121
1122 assert(m);
1123
1124 while ((u = m->cleanup_queue)) {
1125 assert(u->in_cleanup_queue);
1126
1127 unit_free(u);
1128 n++;
1129 }
1130
1131 return n;
1132 }
1133
1134 enum {
1135 GC_OFFSET_IN_PATH, /* This one is on the path we were traveling */
1136 GC_OFFSET_UNSURE, /* No clue */
1137 GC_OFFSET_GOOD, /* We still need this unit */
1138 GC_OFFSET_BAD, /* We don't need this unit anymore */
1139 _GC_OFFSET_MAX
1140 };
1141
1142 static void unit_gc_mark_good(Unit *u, unsigned gc_marker) {
1143 Unit *other;
1144
1145 u->gc_marker = gc_marker + GC_OFFSET_GOOD;
1146
1147 /* Recursively mark referenced units as GOOD as well */
1148 UNIT_FOREACH_DEPENDENCY(other, u, UNIT_ATOM_REFERENCES)
1149 if (other->gc_marker == gc_marker + GC_OFFSET_UNSURE)
1150 unit_gc_mark_good(other, gc_marker);
1151 }
1152
1153 static void unit_gc_sweep(Unit *u, unsigned gc_marker) {
1154 Unit *other;
1155 bool is_bad;
1156
1157 assert(u);
1158
1159 if (IN_SET(u->gc_marker - gc_marker,
1160 GC_OFFSET_GOOD, GC_OFFSET_BAD, GC_OFFSET_UNSURE, GC_OFFSET_IN_PATH))
1161 return;
1162
1163 if (u->in_cleanup_queue)
1164 goto bad;
1165
1166 if (!unit_may_gc(u))
1167 goto good;
1168
1169 u->gc_marker = gc_marker + GC_OFFSET_IN_PATH;
1170
1171 is_bad = true;
1172
1173 UNIT_FOREACH_DEPENDENCY(other, u, UNIT_ATOM_REFERENCED_BY) {
1174 unit_gc_sweep(other, gc_marker);
1175
1176 if (other->gc_marker == gc_marker + GC_OFFSET_GOOD)
1177 goto good;
1178
1179 if (other->gc_marker != gc_marker + GC_OFFSET_BAD)
1180 is_bad = false;
1181 }
1182
1183 const UnitRef *ref;
1184 LIST_FOREACH(refs_by_target, ref, u->refs_by_target) {
1185 unit_gc_sweep(ref->source, gc_marker);
1186
1187 if (ref->source->gc_marker == gc_marker + GC_OFFSET_GOOD)
1188 goto good;
1189
1190 if (ref->source->gc_marker != gc_marker + GC_OFFSET_BAD)
1191 is_bad = false;
1192 }
1193
1194 if (is_bad)
1195 goto bad;
1196
1197 /* We were unable to find anything out about this entry, so
1198 * let's investigate it later */
1199 u->gc_marker = gc_marker + GC_OFFSET_UNSURE;
1200 unit_add_to_gc_queue(u);
1201 return;
1202
1203 bad:
1204 /* We definitely know that this one is not useful anymore, so
1205 * let's mark it for deletion */
1206 u->gc_marker = gc_marker + GC_OFFSET_BAD;
1207 unit_add_to_cleanup_queue(u);
1208 return;
1209
1210 good:
1211 unit_gc_mark_good(u, gc_marker);
1212 }
1213
1214 static unsigned manager_dispatch_gc_unit_queue(Manager *m) {
1215 unsigned n = 0, gc_marker;
1216 Unit *u;
1217
1218 assert(m);
1219
1220 /* log_debug("Running GC..."); */
1221
1222 m->gc_marker += _GC_OFFSET_MAX;
1223 if (m->gc_marker + _GC_OFFSET_MAX <= _GC_OFFSET_MAX)
1224 m->gc_marker = 1;
1225
1226 gc_marker = m->gc_marker;
1227
1228 while ((u = m->gc_unit_queue)) {
1229 assert(u->in_gc_queue);
1230
1231 unit_gc_sweep(u, gc_marker);
1232
1233 LIST_REMOVE(gc_queue, m->gc_unit_queue, u);
1234 u->in_gc_queue = false;
1235
1236 n++;
1237
1238 if (IN_SET(u->gc_marker - gc_marker,
1239 GC_OFFSET_BAD, GC_OFFSET_UNSURE)) {
1240 if (u->id)
1241 log_unit_debug(u, "Collecting.");
1242 u->gc_marker = gc_marker + GC_OFFSET_BAD;
1243 unit_add_to_cleanup_queue(u);
1244 }
1245 }
1246
1247 return n;
1248 }
1249
1250 static unsigned manager_dispatch_gc_job_queue(Manager *m) {
1251 unsigned n = 0;
1252 Job *j;
1253
1254 assert(m);
1255
1256 while ((j = m->gc_job_queue)) {
1257 assert(j->in_gc_queue);
1258
1259 LIST_REMOVE(gc_queue, m->gc_job_queue, j);
1260 j->in_gc_queue = false;
1261
1262 n++;
1263
1264 if (!job_may_gc(j))
1265 continue;
1266
1267 log_unit_debug(j->unit, "Collecting job.");
1268 (void) job_finish_and_invalidate(j, JOB_COLLECTED, false, false);
1269 }
1270
1271 return n;
1272 }
1273
1274 static unsigned manager_dispatch_stop_when_unneeded_queue(Manager *m) {
1275 unsigned n = 0;
1276 Unit *u;
1277 int r;
1278
1279 assert(m);
1280
1281 while ((u = m->stop_when_unneeded_queue)) {
1282 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
1283
1284 assert(u->in_stop_when_unneeded_queue);
1285 LIST_REMOVE(stop_when_unneeded_queue, m->stop_when_unneeded_queue, u);
1286 u->in_stop_when_unneeded_queue = false;
1287
1288 n++;
1289
1290 if (!unit_is_unneeded(u))
1291 continue;
1292
1293 log_unit_debug(u, "Unit is not needed anymore.");
1294
1295 /* If stopping a unit fails continuously we might enter a stop loop here, hence stop acting on the
1296 * service being unnecessary after a while. */
1297
1298 if (!ratelimit_below(&u->auto_start_stop_ratelimit)) {
1299 log_unit_warning(u, "Unit not needed anymore, but not stopping since we tried this too often recently.");
1300 continue;
1301 }
1302
1303 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
1304 r = manager_add_job(u->manager, JOB_STOP, u, JOB_FAIL, NULL, &error, NULL);
1305 if (r < 0)
1306 log_unit_warning_errno(u, r, "Failed to enqueue stop job, ignoring: %s", bus_error_message(&error, r));
1307 }
1308
1309 return n;
1310 }
1311
1312 static unsigned manager_dispatch_start_when_upheld_queue(Manager *m) {
1313 unsigned n = 0;
1314 Unit *u;
1315 int r;
1316
1317 assert(m);
1318
1319 while ((u = m->start_when_upheld_queue)) {
1320 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
1321 Unit *culprit = NULL;
1322
1323 assert(u->in_start_when_upheld_queue);
1324 LIST_REMOVE(start_when_upheld_queue, m->start_when_upheld_queue, u);
1325 u->in_start_when_upheld_queue = false;
1326
1327 n++;
1328
1329 if (!unit_is_upheld_by_active(u, &culprit))
1330 continue;
1331
1332 log_unit_debug(u, "Unit is started because upheld by active unit %s.", culprit->id);
1333
1334 /* If stopping a unit fails continuously we might enter a stop loop here, hence stop acting on the
1335 * service being unnecessary after a while. */
1336
1337 if (!ratelimit_below(&u->auto_start_stop_ratelimit)) {
1338 log_unit_warning(u, "Unit needs to be started because active unit %s upholds it, but not starting since we tried this too often recently.", culprit->id);
1339 continue;
1340 }
1341
1342 r = manager_add_job(u->manager, JOB_START, u, JOB_FAIL, NULL, &error, NULL);
1343 if (r < 0)
1344 log_unit_warning_errno(u, r, "Failed to enqueue start job, ignoring: %s", bus_error_message(&error, r));
1345 }
1346
1347 return n;
1348 }
1349
1350 static unsigned manager_dispatch_stop_when_bound_queue(Manager *m) {
1351 unsigned n = 0;
1352 Unit *u;
1353 int r;
1354
1355 assert(m);
1356
1357 while ((u = m->stop_when_bound_queue)) {
1358 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
1359 Unit *culprit = NULL;
1360
1361 assert(u->in_stop_when_bound_queue);
1362 LIST_REMOVE(stop_when_bound_queue, m->stop_when_bound_queue, u);
1363 u->in_stop_when_bound_queue = false;
1364
1365 n++;
1366
1367 if (!unit_is_bound_by_inactive(u, &culprit))
1368 continue;
1369
1370 log_unit_debug(u, "Unit is stopped because bound to inactive unit %s.", culprit->id);
1371
1372 /* If stopping a unit fails continuously we might enter a stop loop here, hence stop acting on the
1373 * service being unnecessary after a while. */
1374
1375 if (!ratelimit_below(&u->auto_start_stop_ratelimit)) {
1376 log_unit_warning(u, "Unit needs to be stopped because it is bound to inactive unit %s it, but not stopping since we tried this too often recently.", culprit->id);
1377 continue;
1378 }
1379
1380 r = manager_add_job(u->manager, JOB_STOP, u, JOB_REPLACE, NULL, &error, NULL);
1381 if (r < 0)
1382 log_unit_warning_errno(u, r, "Failed to enqueue stop job, ignoring: %s", bus_error_message(&error, r));
1383 }
1384
1385 return n;
1386 }
1387
1388 static void manager_clear_jobs_and_units(Manager *m) {
1389 Unit *u;
1390
1391 assert(m);
1392
1393 while ((u = hashmap_first(m->units)))
1394 unit_free(u);
1395
1396 manager_dispatch_cleanup_queue(m);
1397
1398 assert(!m->load_queue);
1399 assert(prioq_isempty(m->run_queue));
1400 assert(!m->dbus_unit_queue);
1401 assert(!m->dbus_job_queue);
1402 assert(!m->cleanup_queue);
1403 assert(!m->gc_unit_queue);
1404 assert(!m->gc_job_queue);
1405 assert(!m->stop_when_unneeded_queue);
1406 assert(!m->start_when_upheld_queue);
1407 assert(!m->stop_when_bound_queue);
1408
1409 assert(hashmap_isempty(m->jobs));
1410 assert(hashmap_isempty(m->units));
1411
1412 m->n_on_console = 0;
1413 m->n_running_jobs = 0;
1414 m->n_installed_jobs = 0;
1415 m->n_failed_jobs = 0;
1416 }
1417
1418 Manager* manager_free(Manager *m) {
1419 if (!m)
1420 return NULL;
1421
1422 manager_clear_jobs_and_units(m);
1423
1424 for (UnitType c = 0; c < _UNIT_TYPE_MAX; c++)
1425 if (unit_vtable[c]->shutdown)
1426 unit_vtable[c]->shutdown(m);
1427
1428 /* Keep the cgroup hierarchy in place except when we know we are going down for good */
1429 manager_shutdown_cgroup(m, IN_SET(m->objective, MANAGER_EXIT, MANAGER_REBOOT, MANAGER_POWEROFF, MANAGER_HALT, MANAGER_KEXEC));
1430
1431 lookup_paths_flush_generator(&m->lookup_paths);
1432
1433 bus_done(m);
1434 manager_varlink_done(m);
1435
1436 exec_runtime_vacuum(m);
1437 hashmap_free(m->exec_runtime_by_id);
1438
1439 dynamic_user_vacuum(m, false);
1440 hashmap_free(m->dynamic_users);
1441
1442 hashmap_free(m->units);
1443 hashmap_free(m->units_by_invocation_id);
1444 hashmap_free(m->jobs);
1445 hashmap_free(m->watch_pids);
1446 hashmap_free(m->watch_bus);
1447
1448 prioq_free(m->run_queue);
1449
1450 set_free(m->startup_units);
1451 set_free(m->failed_units);
1452
1453 sd_event_source_unref(m->signal_event_source);
1454 sd_event_source_unref(m->sigchld_event_source);
1455 sd_event_source_unref(m->notify_event_source);
1456 sd_event_source_unref(m->cgroups_agent_event_source);
1457 sd_event_source_unref(m->time_change_event_source);
1458 sd_event_source_unref(m->timezone_change_event_source);
1459 sd_event_source_unref(m->jobs_in_progress_event_source);
1460 sd_event_source_unref(m->run_queue_event_source);
1461 sd_event_source_unref(m->user_lookup_event_source);
1462
1463 safe_close(m->signal_fd);
1464 safe_close(m->notify_fd);
1465 safe_close(m->cgroups_agent_fd);
1466 safe_close(m->time_change_fd);
1467 safe_close_pair(m->user_lookup_fds);
1468
1469 manager_close_ask_password(m);
1470
1471 manager_close_idle_pipe(m);
1472
1473 sd_event_unref(m->event);
1474
1475 free(m->notify_socket);
1476
1477 lookup_paths_free(&m->lookup_paths);
1478 strv_free(m->transient_environment);
1479 strv_free(m->client_environment);
1480
1481 hashmap_free(m->cgroup_unit);
1482 manager_free_unit_name_maps(m);
1483
1484 free(m->switch_root);
1485 free(m->switch_root_init);
1486
1487 rlimit_free_all(m->rlimit);
1488
1489 assert(hashmap_isempty(m->units_requiring_mounts_for));
1490 hashmap_free(m->units_requiring_mounts_for);
1491
1492 hashmap_free(m->uid_refs);
1493 hashmap_free(m->gid_refs);
1494
1495 for (ExecDirectoryType dt = 0; dt < _EXEC_DIRECTORY_TYPE_MAX; dt++)
1496 m->prefix[dt] = mfree(m->prefix[dt]);
1497 free(m->received_credentials);
1498
1499 return mfree(m);
1500 }
1501
1502 static void manager_enumerate_perpetual(Manager *m) {
1503 assert(m);
1504
1505 if (m->test_run_flags == MANAGER_TEST_RUN_MINIMAL)
1506 return;
1507
1508 /* Let's ask every type to load all units from disk/kernel that it might know */
1509 for (UnitType c = 0; c < _UNIT_TYPE_MAX; c++) {
1510 if (!unit_type_supported(c)) {
1511 log_debug("Unit type .%s is not supported on this system.", unit_type_to_string(c));
1512 continue;
1513 }
1514
1515 if (unit_vtable[c]->enumerate_perpetual)
1516 unit_vtable[c]->enumerate_perpetual(m);
1517 }
1518 }
1519
1520 static void manager_enumerate(Manager *m) {
1521 assert(m);
1522
1523 if (m->test_run_flags == MANAGER_TEST_RUN_MINIMAL)
1524 return;
1525
1526 /* Let's ask every type to load all units from disk/kernel that it might know */
1527 for (UnitType c = 0; c < _UNIT_TYPE_MAX; c++) {
1528 if (!unit_type_supported(c)) {
1529 log_debug("Unit type .%s is not supported on this system.", unit_type_to_string(c));
1530 continue;
1531 }
1532
1533 if (unit_vtable[c]->enumerate)
1534 unit_vtable[c]->enumerate(m);
1535 }
1536
1537 manager_dispatch_load_queue(m);
1538 }
1539
1540 static void manager_coldplug(Manager *m) {
1541 Unit *u;
1542 char *k;
1543 int r;
1544
1545 assert(m);
1546
1547 log_debug("Invoking unit coldplug() handlers…");
1548
1549 /* Let's place the units back into their deserialized state */
1550 HASHMAP_FOREACH_KEY(u, k, m->units) {
1551
1552 /* ignore aliases */
1553 if (u->id != k)
1554 continue;
1555
1556 r = unit_coldplug(u);
1557 if (r < 0)
1558 log_warning_errno(r, "We couldn't coldplug %s, proceeding anyway: %m", u->id);
1559 }
1560 }
1561
1562 static void manager_catchup(Manager *m) {
1563 Unit *u;
1564 char *k;
1565
1566 assert(m);
1567
1568 log_debug("Invoking unit catchup() handlers…");
1569
1570 /* Let's catch up on any state changes that happened while we were reloading/reexecing */
1571 HASHMAP_FOREACH_KEY(u, k, m->units) {
1572
1573 /* ignore aliases */
1574 if (u->id != k)
1575 continue;
1576
1577 unit_catchup(u);
1578 }
1579 }
1580
1581 static void manager_distribute_fds(Manager *m, FDSet *fds) {
1582 Unit *u;
1583
1584 assert(m);
1585
1586 HASHMAP_FOREACH(u, m->units) {
1587
1588 if (fdset_size(fds) <= 0)
1589 break;
1590
1591 if (!UNIT_VTABLE(u)->distribute_fds)
1592 continue;
1593
1594 UNIT_VTABLE(u)->distribute_fds(u, fds);
1595 }
1596 }
1597
1598 static bool manager_dbus_is_running(Manager *m, bool deserialized) {
1599 Unit *u;
1600
1601 assert(m);
1602
1603 /* This checks whether the dbus instance we are supposed to expose our APIs on is up. We check both the socket
1604 * and the service unit. If the 'deserialized' parameter is true we'll check the deserialized state of the unit
1605 * rather than the current one. */
1606
1607 if (MANAGER_IS_TEST_RUN(m))
1608 return false;
1609
1610 u = manager_get_unit(m, SPECIAL_DBUS_SOCKET);
1611 if (!u)
1612 return false;
1613 if ((deserialized ? SOCKET(u)->deserialized_state : SOCKET(u)->state) != SOCKET_RUNNING)
1614 return false;
1615
1616 u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
1617 if (!u)
1618 return false;
1619 if (!IN_SET((deserialized ? SERVICE(u)->deserialized_state : SERVICE(u)->state), SERVICE_RUNNING, SERVICE_RELOAD))
1620 return false;
1621
1622 return true;
1623 }
1624
1625 static void manager_setup_bus(Manager *m) {
1626 assert(m);
1627
1628 /* Let's set up our private bus connection now, unconditionally */
1629 (void) bus_init_private(m);
1630
1631 /* If we are in --user mode also connect to the system bus now */
1632 if (MANAGER_IS_USER(m))
1633 (void) bus_init_system(m);
1634
1635 /* Let's connect to the bus now, but only if the unit is supposed to be up */
1636 if (manager_dbus_is_running(m, MANAGER_IS_RELOADING(m))) {
1637 (void) bus_init_api(m);
1638
1639 if (MANAGER_IS_SYSTEM(m))
1640 (void) bus_init_system(m);
1641 }
1642 }
1643
1644 static void manager_preset_all(Manager *m) {
1645 int r;
1646
1647 assert(m);
1648
1649 if (m->first_boot <= 0)
1650 return;
1651
1652 if (!MANAGER_IS_SYSTEM(m))
1653 return;
1654
1655 if (MANAGER_IS_TEST_RUN(m))
1656 return;
1657
1658 /* If this is the first boot, and we are in the host system, then preset everything */
1659 r = unit_file_preset_all(UNIT_FILE_SYSTEM, 0, NULL, UNIT_FILE_PRESET_ENABLE_ONLY, NULL, 0);
1660 if (r < 0)
1661 log_full_errno(r == -EEXIST ? LOG_NOTICE : LOG_WARNING, r,
1662 "Failed to populate /etc with preset unit settings, ignoring: %m");
1663 else
1664 log_info("Populated /etc with preset unit settings.");
1665 }
1666
1667 static void manager_ready(Manager *m) {
1668 assert(m);
1669
1670 /* After having loaded everything, do the final round of catching up with what might have changed */
1671
1672 m->objective = MANAGER_OK; /* Tell everyone we are up now */
1673
1674 /* It might be safe to log to the journal now and connect to dbus */
1675 manager_recheck_journal(m);
1676 manager_recheck_dbus(m);
1677
1678 /* Let's finally catch up with any changes that took place while we were reloading/reexecing */
1679 manager_catchup(m);
1680
1681 m->honor_device_enumeration = true;
1682 }
1683
1684 static Manager* manager_reloading_start(Manager *m) {
1685 m->n_reloading++;
1686 return m;
1687 }
1688 static void manager_reloading_stopp(Manager **m) {
1689 if (*m) {
1690 assert((*m)->n_reloading > 0);
1691 (*m)->n_reloading--;
1692 }
1693 }
1694
1695 int manager_startup(Manager *m, FILE *serialization, FDSet *fds) {
1696 int r;
1697
1698 assert(m);
1699
1700 /* If we are running in test mode, we still want to run the generators,
1701 * but we should not touch the real generator directories. */
1702 r = lookup_paths_init(&m->lookup_paths, m->unit_file_scope,
1703 MANAGER_IS_TEST_RUN(m) ? LOOKUP_PATHS_TEMPORARY_GENERATED : 0,
1704 NULL);
1705 if (r < 0)
1706 return log_error_errno(r, "Failed to initialize path lookup table: %m");
1707
1708 dual_timestamp_get(m->timestamps + manager_timestamp_initrd_mangle(MANAGER_TIMESTAMP_GENERATORS_START));
1709 r = manager_run_environment_generators(m);
1710 if (r >= 0)
1711 r = manager_run_generators(m);
1712 dual_timestamp_get(m->timestamps + manager_timestamp_initrd_mangle(MANAGER_TIMESTAMP_GENERATORS_FINISH));
1713 if (r < 0)
1714 return r;
1715
1716 manager_preset_all(m);
1717
1718 lookup_paths_log(&m->lookup_paths);
1719
1720 {
1721 /* This block is (optionally) done with the reloading counter bumped */
1722 _cleanup_(manager_reloading_stopp) Manager *reloading = NULL;
1723
1724 /* If we will deserialize make sure that during enumeration this is already known, so we increase the
1725 * counter here already */
1726 if (serialization)
1727 reloading = manager_reloading_start(m);
1728
1729 /* First, enumerate what we can from all config files */
1730 dual_timestamp_get(m->timestamps + manager_timestamp_initrd_mangle(MANAGER_TIMESTAMP_UNITS_LOAD_START));
1731 manager_enumerate_perpetual(m);
1732 manager_enumerate(m);
1733 dual_timestamp_get(m->timestamps + manager_timestamp_initrd_mangle(MANAGER_TIMESTAMP_UNITS_LOAD_FINISH));
1734
1735 /* Second, deserialize if there is something to deserialize */
1736 if (serialization) {
1737 r = manager_deserialize(m, serialization, fds);
1738 if (r < 0)
1739 return log_error_errno(r, "Deserialization failed: %m");
1740 }
1741
1742 /* Any fds left? Find some unit which wants them. This is useful to allow container managers to pass
1743 * some file descriptors to us pre-initialized. This enables socket-based activation of entire
1744 * containers. */
1745 manager_distribute_fds(m, fds);
1746
1747 /* We might have deserialized the notify fd, but if we didn't then let's create the bus now */
1748 r = manager_setup_notify(m);
1749 if (r < 0)
1750 /* No sense to continue without notifications, our children would fail anyway. */
1751 return r;
1752
1753 r = manager_setup_cgroups_agent(m);
1754 if (r < 0)
1755 /* Likewise, no sense to continue without empty cgroup notifications. */
1756 return r;
1757
1758 r = manager_setup_user_lookup_fd(m);
1759 if (r < 0)
1760 /* This shouldn't fail, except if things are really broken. */
1761 return r;
1762
1763 /* Connect to the bus if we are good for it */
1764 manager_setup_bus(m);
1765
1766 /* Now that we are connected to all possible buses, let's deserialize who is tracking us. */
1767 r = bus_track_coldplug(m, &m->subscribed, false, m->deserialized_subscribed);
1768 if (r < 0)
1769 log_warning_errno(r, "Failed to deserialized tracked clients, ignoring: %m");
1770 m->deserialized_subscribed = strv_free(m->deserialized_subscribed);
1771
1772 r = manager_varlink_init(m);
1773 if (r < 0)
1774 log_warning_errno(r, "Failed to set up Varlink server, ignoring: %m");
1775
1776 /* Third, fire things up! */
1777 manager_coldplug(m);
1778
1779 /* Clean up runtime objects */
1780 manager_vacuum(m);
1781
1782 if (serialization)
1783 /* Let's wait for the UnitNew/JobNew messages being sent, before we notify that the
1784 * reload is finished */
1785 m->send_reloading_done = true;
1786 }
1787
1788 manager_ready(m);
1789
1790 return 0;
1791 }
1792
1793 int manager_add_job(
1794 Manager *m,
1795 JobType type,
1796 Unit *unit,
1797 JobMode mode,
1798 Set *affected_jobs,
1799 sd_bus_error *error,
1800 Job **ret) {
1801
1802 Transaction *tr;
1803 int r;
1804
1805 assert(m);
1806 assert(type < _JOB_TYPE_MAX);
1807 assert(unit);
1808 assert(mode < _JOB_MODE_MAX);
1809
1810 if (mode == JOB_ISOLATE && type != JOB_START)
1811 return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Isolate is only valid for start.");
1812
1813 if (mode == JOB_ISOLATE && !unit->allow_isolate)
1814 return sd_bus_error_set(error, BUS_ERROR_NO_ISOLATION, "Operation refused, unit may not be isolated.");
1815
1816 if (mode == JOB_TRIGGERING && type != JOB_STOP)
1817 return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "--job-mode=triggering is only valid for stop.");
1818
1819 log_unit_debug(unit, "Trying to enqueue job %s/%s/%s", unit->id, job_type_to_string(type), job_mode_to_string(mode));
1820
1821 type = job_type_collapse(type, unit);
1822
1823 tr = transaction_new(mode == JOB_REPLACE_IRREVERSIBLY);
1824 if (!tr)
1825 return -ENOMEM;
1826
1827 r = transaction_add_job_and_dependencies(tr, type, unit, NULL, true, false,
1828 IN_SET(mode, JOB_IGNORE_DEPENDENCIES, JOB_IGNORE_REQUIREMENTS),
1829 mode == JOB_IGNORE_DEPENDENCIES, error);
1830 if (r < 0)
1831 goto tr_abort;
1832
1833 if (mode == JOB_ISOLATE) {
1834 r = transaction_add_isolate_jobs(tr, m);
1835 if (r < 0)
1836 goto tr_abort;
1837 }
1838
1839 if (mode == JOB_TRIGGERING) {
1840 r = transaction_add_triggering_jobs(tr, unit);
1841 if (r < 0)
1842 goto tr_abort;
1843 }
1844
1845 r = transaction_activate(tr, m, mode, affected_jobs, error);
1846 if (r < 0)
1847 goto tr_abort;
1848
1849 log_unit_debug(unit,
1850 "Enqueued job %s/%s as %u", unit->id,
1851 job_type_to_string(type), (unsigned) tr->anchor_job->id);
1852
1853 if (ret)
1854 *ret = tr->anchor_job;
1855
1856 transaction_free(tr);
1857 return 0;
1858
1859 tr_abort:
1860 transaction_abort(tr);
1861 transaction_free(tr);
1862 return r;
1863 }
1864
1865 int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, Set *affected_jobs, sd_bus_error *e, Job **ret) {
1866 Unit *unit = NULL; /* just to appease gcc, initialization is not really necessary */
1867 int r;
1868
1869 assert(m);
1870 assert(type < _JOB_TYPE_MAX);
1871 assert(name);
1872 assert(mode < _JOB_MODE_MAX);
1873
1874 r = manager_load_unit(m, name, NULL, NULL, &unit);
1875 if (r < 0)
1876 return r;
1877 assert(unit);
1878
1879 return manager_add_job(m, type, unit, mode, affected_jobs, e, ret);
1880 }
1881
1882 int manager_add_job_by_name_and_warn(Manager *m, JobType type, const char *name, JobMode mode, Set *affected_jobs, Job **ret) {
1883 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
1884 int r;
1885
1886 assert(m);
1887 assert(type < _JOB_TYPE_MAX);
1888 assert(name);
1889 assert(mode < _JOB_MODE_MAX);
1890
1891 r = manager_add_job_by_name(m, type, name, mode, affected_jobs, &error, ret);
1892 if (r < 0)
1893 return log_warning_errno(r, "Failed to enqueue %s job for %s: %s", job_mode_to_string(mode), name, bus_error_message(&error, r));
1894
1895 return r;
1896 }
1897
1898 int manager_propagate_reload(Manager *m, Unit *unit, JobMode mode, sd_bus_error *e) {
1899 int r;
1900 Transaction *tr;
1901
1902 assert(m);
1903 assert(unit);
1904 assert(mode < _JOB_MODE_MAX);
1905 assert(mode != JOB_ISOLATE); /* Isolate is only valid for start */
1906
1907 tr = transaction_new(mode == JOB_REPLACE_IRREVERSIBLY);
1908 if (!tr)
1909 return -ENOMEM;
1910
1911 /* We need an anchor job */
1912 r = transaction_add_job_and_dependencies(tr, JOB_NOP, unit, NULL, false, false, true, true, e);
1913 if (r < 0)
1914 goto tr_abort;
1915
1916 /* Failure in adding individual dependencies is ignored, so this always succeeds. */
1917 transaction_add_propagate_reload_jobs(tr, unit, tr->anchor_job, mode == JOB_IGNORE_DEPENDENCIES, e);
1918
1919 r = transaction_activate(tr, m, mode, NULL, e);
1920 if (r < 0)
1921 goto tr_abort;
1922
1923 transaction_free(tr);
1924 return 0;
1925
1926 tr_abort:
1927 transaction_abort(tr);
1928 transaction_free(tr);
1929 return r;
1930 }
1931
1932 Job *manager_get_job(Manager *m, uint32_t id) {
1933 assert(m);
1934
1935 return hashmap_get(m->jobs, UINT32_TO_PTR(id));
1936 }
1937
1938 Unit *manager_get_unit(Manager *m, const char *name) {
1939 assert(m);
1940 assert(name);
1941
1942 return hashmap_get(m->units, name);
1943 }
1944
1945 static int manager_dispatch_target_deps_queue(Manager *m) {
1946 Unit *u;
1947 int r = 0;
1948
1949 assert(m);
1950
1951 while ((u = m->target_deps_queue)) {
1952 _cleanup_free_ Unit **targets = NULL;
1953 int n_targets;
1954
1955 assert(u->in_target_deps_queue);
1956
1957 LIST_REMOVE(target_deps_queue, u->manager->target_deps_queue, u);
1958 u->in_target_deps_queue = false;
1959
1960 /* Take an "atomic" snapshot of dependencies here, as the call below will likely modify the
1961 * dependencies, and we can't have it that hash tables we iterate through are modified while
1962 * we are iterating through them. */
1963 n_targets = unit_get_dependency_array(u, UNIT_ATOM_DEFAULT_TARGET_DEPENDENCIES, &targets);
1964 if (n_targets < 0)
1965 return n_targets;
1966
1967 for (int i = 0; i < n_targets; i++) {
1968 r = unit_add_default_target_dependency(u, targets[i]);
1969 if (r < 0)
1970 return r;
1971 }
1972 }
1973
1974 return r;
1975 }
1976
1977 unsigned manager_dispatch_load_queue(Manager *m) {
1978 Unit *u;
1979 unsigned n = 0;
1980
1981 assert(m);
1982
1983 /* Make sure we are not run recursively */
1984 if (m->dispatching_load_queue)
1985 return 0;
1986
1987 m->dispatching_load_queue = true;
1988
1989 /* Dispatches the load queue. Takes a unit from the queue and
1990 * tries to load its data until the queue is empty */
1991
1992 while ((u = m->load_queue)) {
1993 assert(u->in_load_queue);
1994
1995 unit_load(u);
1996 n++;
1997 }
1998
1999 m->dispatching_load_queue = false;
2000
2001 /* Dispatch the units waiting for their target dependencies to be added now, as all targets that we know about
2002 * should be loaded and have aliases resolved */
2003 (void) manager_dispatch_target_deps_queue(m);
2004
2005 return n;
2006 }
2007
2008 bool manager_unit_cache_should_retry_load(Unit *u) {
2009 assert(u);
2010
2011 /* Automatic reloading from disk only applies to units which were not found sometime in the past, and
2012 * the not-found stub is kept pinned in the unit graph by dependencies. For units that were
2013 * previously loaded, we don't do automatic reloading, and daemon-reload is necessary to update. */
2014 if (u->load_state != UNIT_NOT_FOUND)
2015 return false;
2016
2017 /* The cache has been updated since the last time we tried to load the unit. There might be new
2018 * fragment paths to read. */
2019 if (u->manager->unit_cache_timestamp_hash != u->fragment_not_found_timestamp_hash)
2020 return true;
2021
2022 /* The cache needs to be updated because there are modifications on disk. */
2023 return !lookup_paths_timestamp_hash_same(&u->manager->lookup_paths, u->manager->unit_cache_timestamp_hash, NULL);
2024 }
2025
2026 int manager_load_unit_prepare(
2027 Manager *m,
2028 const char *name,
2029 const char *path,
2030 sd_bus_error *e,
2031 Unit **_ret) {
2032
2033 _cleanup_(unit_freep) Unit *cleanup_ret = NULL;
2034 Unit *ret;
2035 UnitType t;
2036 int r;
2037
2038 assert(m);
2039 assert(_ret);
2040
2041 /* This will prepare the unit for loading, but not actually load anything from disk. */
2042
2043 if (path && !path_is_absolute(path))
2044 return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Path %s is not absolute.", path);
2045
2046 if (!name) {
2047 /* 'name' and 'path' must not both be null. Check here 'path' using assert_se() to
2048 * workaround a bug in gcc that generates a -Wnonnull warning when calling basename(),
2049 * but this cannot be possible in any code path (See #6119). */
2050 assert_se(path);
2051 name = basename(path);
2052 }
2053
2054 t = unit_name_to_type(name);
2055
2056 if (t == _UNIT_TYPE_INVALID || !unit_name_is_valid(name, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) {
2057 if (unit_name_is_valid(name, UNIT_NAME_TEMPLATE))
2058 return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Unit name %s is missing the instance name.", name);
2059
2060 return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Unit name %s is not valid.", name);
2061 }
2062
2063 ret = manager_get_unit(m, name);
2064 if (ret) {
2065 /* The time-based cache allows to start new units without daemon-reload,
2066 * but if they are already referenced (because of dependencies or ordering)
2067 * then we have to force a load of the fragment. As an optimization, check
2068 * first if anything in the usual paths was modified since the last time
2069 * the cache was loaded. Also check if the last time an attempt to load the
2070 * unit was made was before the most recent cache refresh, so that we know
2071 * we need to try again — even if the cache is current, it might have been
2072 * updated in a different context before we had a chance to retry loading
2073 * this particular unit. */
2074 if (manager_unit_cache_should_retry_load(ret))
2075 ret->load_state = UNIT_STUB;
2076 else {
2077 *_ret = ret;
2078 return 1;
2079 }
2080 } else {
2081 ret = cleanup_ret = unit_new(m, unit_vtable[t]->object_size);
2082 if (!ret)
2083 return -ENOMEM;
2084 }
2085
2086 if (path) {
2087 r = free_and_strdup(&ret->fragment_path, path);
2088 if (r < 0)
2089 return r;
2090 }
2091
2092 r = unit_add_name(ret, name);
2093 if (r < 0)
2094 return r;
2095
2096 unit_add_to_load_queue(ret);
2097 unit_add_to_dbus_queue(ret);
2098 unit_add_to_gc_queue(ret);
2099
2100 *_ret = ret;
2101 cleanup_ret = NULL;
2102
2103 return 0;
2104 }
2105
2106 int manager_load_unit(
2107 Manager *m,
2108 const char *name,
2109 const char *path,
2110 sd_bus_error *e,
2111 Unit **_ret) {
2112
2113 int r;
2114
2115 assert(m);
2116 assert(_ret);
2117
2118 /* This will load the service information files, but not actually
2119 * start any services or anything. */
2120
2121 r = manager_load_unit_prepare(m, name, path, e, _ret);
2122 if (r != 0)
2123 return r;
2124
2125 manager_dispatch_load_queue(m);
2126
2127 *_ret = unit_follow_merge(*_ret);
2128 return 0;
2129 }
2130
2131 int manager_load_startable_unit_or_warn(
2132 Manager *m,
2133 const char *name,
2134 const char *path,
2135 Unit **ret) {
2136
2137 /* Load a unit, make sure it loaded fully and is not masked. */
2138
2139 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2140 Unit *unit;
2141 int r;
2142
2143 r = manager_load_unit(m, name, path, &error, &unit);
2144 if (r < 0)
2145 return log_error_errno(r, "Failed to load %s %s: %s",
2146 name ? "unit" : "unit file", name ?: path,
2147 bus_error_message(&error, r));
2148
2149 r = bus_unit_validate_load_state(unit, &error);
2150 if (r < 0)
2151 return log_error_errno(r, "%s", bus_error_message(&error, r));
2152
2153 *ret = unit;
2154 return 0;
2155 }
2156
2157 void manager_dump_jobs(Manager *s, FILE *f, const char *prefix) {
2158 Job *j;
2159
2160 assert(s);
2161 assert(f);
2162
2163 HASHMAP_FOREACH(j, s->jobs)
2164 job_dump(j, f, prefix);
2165 }
2166
2167 void manager_dump_units(Manager *s, FILE *f, const char *prefix) {
2168 Unit *u;
2169 const char *t;
2170
2171 assert(s);
2172 assert(f);
2173
2174 HASHMAP_FOREACH_KEY(u, t, s->units)
2175 if (u->id == t)
2176 unit_dump(u, f, prefix);
2177 }
2178
2179 void manager_dump(Manager *m, FILE *f, const char *prefix) {
2180 assert(m);
2181 assert(f);
2182
2183 for (ManagerTimestamp q = 0; q < _MANAGER_TIMESTAMP_MAX; q++) {
2184 const dual_timestamp *t = m->timestamps + q;
2185 char buf[CONST_MAX(FORMAT_TIMESPAN_MAX, FORMAT_TIMESTAMP_MAX)];
2186
2187 if (dual_timestamp_is_set(t))
2188 fprintf(f, "%sTimestamp %s: %s\n",
2189 strempty(prefix),
2190 manager_timestamp_to_string(q),
2191 timestamp_is_set(t->realtime) ? format_timestamp(buf, sizeof buf, t->realtime) :
2192 format_timespan(buf, sizeof buf, t->monotonic, 1));
2193 }
2194
2195 manager_dump_units(m, f, prefix);
2196 manager_dump_jobs(m, f, prefix);
2197 }
2198
2199 int manager_get_dump_string(Manager *m, char **ret) {
2200 _cleanup_free_ char *dump = NULL;
2201 _cleanup_fclose_ FILE *f = NULL;
2202 size_t size;
2203 int r;
2204
2205 assert(m);
2206 assert(ret);
2207
2208 f = open_memstream_unlocked(&dump, &size);
2209 if (!f)
2210 return -errno;
2211
2212 manager_dump(m, f, NULL);
2213
2214 r = fflush_and_check(f);
2215 if (r < 0)
2216 return r;
2217
2218 f = safe_fclose(f);
2219
2220 *ret = TAKE_PTR(dump);
2221
2222 return 0;
2223 }
2224
2225 void manager_clear_jobs(Manager *m) {
2226 Job *j;
2227
2228 assert(m);
2229
2230 while ((j = hashmap_first(m->jobs)))
2231 /* No need to recurse. We're cancelling all jobs. */
2232 job_finish_and_invalidate(j, JOB_CANCELED, false, false);
2233 }
2234
2235 void manager_unwatch_pid(Manager *m, pid_t pid) {
2236 assert(m);
2237
2238 /* First let's drop the unit keyed as "pid". */
2239 (void) hashmap_remove(m->watch_pids, PID_TO_PTR(pid));
2240
2241 /* Then, let's also drop the array keyed by -pid. */
2242 free(hashmap_remove(m->watch_pids, PID_TO_PTR(-pid)));
2243 }
2244
2245 static int manager_dispatch_run_queue(sd_event_source *source, void *userdata) {
2246 Manager *m = userdata;
2247 Job *j;
2248
2249 assert(source);
2250 assert(m);
2251
2252 while ((j = prioq_peek(m->run_queue))) {
2253 assert(j->installed);
2254 assert(j->in_run_queue);
2255
2256 (void) job_run_and_invalidate(j);
2257 }
2258
2259 if (m->n_running_jobs > 0)
2260 manager_watch_jobs_in_progress(m);
2261
2262 if (m->n_on_console > 0)
2263 manager_watch_idle_pipe(m);
2264
2265 return 1;
2266 }
2267
2268 static unsigned manager_dispatch_dbus_queue(Manager *m) {
2269 unsigned n = 0, budget;
2270 Unit *u;
2271 Job *j;
2272
2273 assert(m);
2274
2275 /* When we are reloading, let's not wait with generating signals, since we need to exit the manager as quickly
2276 * as we can. There's no point in throttling generation of signals in that case. */
2277 if (MANAGER_IS_RELOADING(m) || m->send_reloading_done || m->pending_reload_message)
2278 budget = UINT_MAX; /* infinite budget in this case */
2279 else {
2280 /* Anything to do at all? */
2281 if (!m->dbus_unit_queue && !m->dbus_job_queue)
2282 return 0;
2283
2284 /* Do we have overly many messages queued at the moment? If so, let's not enqueue more on top, let's
2285 * sit this cycle out, and process things in a later cycle when the queues got a bit emptier. */
2286 if (manager_bus_n_queued_write(m) > MANAGER_BUS_BUSY_THRESHOLD)
2287 return 0;
2288
2289 /* Only process a certain number of units/jobs per event loop iteration. Even if the bus queue wasn't
2290 * overly full before this call we shouldn't increase it in size too wildly in one step, and we
2291 * shouldn't monopolize CPU time with generating these messages. Note the difference in counting of
2292 * this "budget" and the "threshold" above: the "budget" is decreased only once per generated message,
2293 * regardless how many buses/direct connections it is enqueued on, while the "threshold" is applied to
2294 * each queued instance of bus message, i.e. if the same message is enqueued to five buses/direct
2295 * connections it will be counted five times. This difference in counting ("references"
2296 * vs. "instances") is primarily a result of the fact that it's easier to implement it this way,
2297 * however it also reflects the thinking that the "threshold" should put a limit on used queue memory,
2298 * i.e. space, while the "budget" should put a limit on time. Also note that the "threshold" is
2299 * currently chosen much higher than the "budget". */
2300 budget = MANAGER_BUS_MESSAGE_BUDGET;
2301 }
2302
2303 while (budget != 0 && (u = m->dbus_unit_queue)) {
2304
2305 assert(u->in_dbus_queue);
2306
2307 bus_unit_send_change_signal(u);
2308 n++;
2309
2310 if (budget != UINT_MAX)
2311 budget--;
2312 }
2313
2314 while (budget != 0 && (j = m->dbus_job_queue)) {
2315 assert(j->in_dbus_queue);
2316
2317 bus_job_send_change_signal(j);
2318 n++;
2319
2320 if (budget != UINT_MAX)
2321 budget--;
2322 }
2323
2324 if (m->send_reloading_done) {
2325 m->send_reloading_done = false;
2326 bus_manager_send_reloading(m, false);
2327 n++;
2328 }
2329
2330 if (m->pending_reload_message) {
2331 bus_send_pending_reload_message(m);
2332 n++;
2333 }
2334
2335 return n;
2336 }
2337
2338 static int manager_dispatch_cgroups_agent_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2339 Manager *m = userdata;
2340 char buf[PATH_MAX];
2341 ssize_t n;
2342
2343 n = recv(fd, buf, sizeof(buf), 0);
2344 if (n < 0)
2345 return log_error_errno(errno, "Failed to read cgroups agent message: %m");
2346 if (n == 0) {
2347 log_error("Got zero-length cgroups agent message, ignoring.");
2348 return 0;
2349 }
2350 if ((size_t) n >= sizeof(buf)) {
2351 log_error("Got overly long cgroups agent message, ignoring.");
2352 return 0;
2353 }
2354
2355 if (memchr(buf, 0, n)) {
2356 log_error("Got cgroups agent message with embedded NUL byte, ignoring.");
2357 return 0;
2358 }
2359 buf[n] = 0;
2360
2361 manager_notify_cgroup_empty(m, buf);
2362 (void) bus_forward_agent_released(m, buf);
2363
2364 return 0;
2365 }
2366
2367 static bool manager_process_barrier_fd(char * const *tags, FDSet *fds) {
2368
2369 /* nothing else must be sent when using BARRIER=1 */
2370 if (strv_contains(tags, "BARRIER=1")) {
2371 if (strv_length(tags) == 1) {
2372 if (fdset_size(fds) != 1)
2373 log_warning("Got incorrect number of fds with BARRIER=1, closing them.");
2374 } else
2375 log_warning("Extra notification messages sent with BARRIER=1, ignoring everything.");
2376
2377 /* Drop the message if BARRIER=1 was found */
2378 return true;
2379 }
2380
2381 return false;
2382 }
2383
2384 static void manager_invoke_notify_message(
2385 Manager *m,
2386 Unit *u,
2387 const struct ucred *ucred,
2388 char * const *tags,
2389 FDSet *fds) {
2390
2391 assert(m);
2392 assert(u);
2393 assert(ucred);
2394 assert(tags);
2395
2396 if (u->notifygen == m->notifygen) /* Already invoked on this same unit in this same iteration? */
2397 return;
2398 u->notifygen = m->notifygen;
2399
2400 if (UNIT_VTABLE(u)->notify_message)
2401 UNIT_VTABLE(u)->notify_message(u, ucred, tags, fds);
2402
2403 else if (DEBUG_LOGGING) {
2404 _cleanup_free_ char *buf = NULL, *x = NULL, *y = NULL;
2405
2406 buf = strv_join(tags, ", ");
2407 if (buf)
2408 x = ellipsize(buf, 20, 90);
2409 if (x)
2410 y = cescape(x);
2411
2412 log_unit_debug(u, "Got notification message \"%s\", ignoring.", strnull(y));
2413 }
2414 }
2415
2416 static int manager_dispatch_notify_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2417
2418 _cleanup_fdset_free_ FDSet *fds = NULL;
2419 Manager *m = userdata;
2420 char buf[NOTIFY_BUFFER_MAX+1];
2421 struct iovec iovec = {
2422 .iov_base = buf,
2423 .iov_len = sizeof(buf)-1,
2424 };
2425 CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct ucred)) +
2426 CMSG_SPACE(sizeof(int) * NOTIFY_FD_MAX)) control;
2427 struct msghdr msghdr = {
2428 .msg_iov = &iovec,
2429 .msg_iovlen = 1,
2430 .msg_control = &control,
2431 .msg_controllen = sizeof(control),
2432 };
2433
2434 struct cmsghdr *cmsg;
2435 struct ucred *ucred = NULL;
2436 _cleanup_free_ Unit **array_copy = NULL;
2437 _cleanup_strv_free_ char **tags = NULL;
2438 Unit *u1, *u2, **array;
2439 int r, *fd_array = NULL;
2440 size_t n_fds = 0;
2441 bool found = false;
2442 ssize_t n;
2443
2444 assert(m);
2445 assert(m->notify_fd == fd);
2446
2447 if (revents != EPOLLIN) {
2448 log_warning("Got unexpected poll event for notify fd.");
2449 return 0;
2450 }
2451
2452 n = recvmsg_safe(m->notify_fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC|MSG_TRUNC);
2453 if (IN_SET(n, -EAGAIN, -EINTR))
2454 return 0; /* Spurious wakeup, try again */
2455 if (n == -EXFULL) {
2456 log_warning("Got message with truncated control data (too many fds sent?), ignoring.");
2457 return 0;
2458 }
2459 if (n < 0)
2460 /* If this is any other, real error, then let's stop processing this socket. This of course
2461 * means we won't take notification messages anymore, but that's still better than busy
2462 * looping around this: being woken up over and over again but being unable to actually read
2463 * the message off the socket. */
2464 return log_error_errno(n, "Failed to receive notification message: %m");
2465
2466 CMSG_FOREACH(cmsg, &msghdr) {
2467 if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) {
2468
2469 assert(!fd_array);
2470 fd_array = (int*) CMSG_DATA(cmsg);
2471 n_fds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int);
2472
2473 } else if (cmsg->cmsg_level == SOL_SOCKET &&
2474 cmsg->cmsg_type == SCM_CREDENTIALS &&
2475 cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) {
2476
2477 assert(!ucred);
2478 ucred = (struct ucred*) CMSG_DATA(cmsg);
2479 }
2480 }
2481
2482 if (n_fds > 0) {
2483 assert(fd_array);
2484
2485 r = fdset_new_array(&fds, fd_array, n_fds);
2486 if (r < 0) {
2487 close_many(fd_array, n_fds);
2488 log_oom();
2489 return 0;
2490 }
2491 }
2492
2493 if (!ucred || !pid_is_valid(ucred->pid)) {
2494 log_warning("Received notify message without valid credentials. Ignoring.");
2495 return 0;
2496 }
2497
2498 if ((size_t) n >= sizeof(buf) || (msghdr.msg_flags & MSG_TRUNC)) {
2499 log_warning("Received notify message exceeded maximum size. Ignoring.");
2500 return 0;
2501 }
2502
2503 /* As extra safety check, let's make sure the string we get doesn't contain embedded NUL bytes. We permit one
2504 * trailing NUL byte in the message, but don't expect it. */
2505 if (n > 1 && memchr(buf, 0, n-1)) {
2506 log_warning("Received notify message with embedded NUL bytes. Ignoring.");
2507 return 0;
2508 }
2509
2510 /* Make sure it's NUL-terminated, then parse it to obtain the tags list */
2511 buf[n] = 0;
2512 tags = strv_split_newlines(buf);
2513 if (!tags) {
2514 log_oom();
2515 return 0;
2516 }
2517
2518 /* possibly a barrier fd, let's see */
2519 if (manager_process_barrier_fd(tags, fds))
2520 return 0;
2521
2522 /* Increase the generation counter used for filtering out duplicate unit invocations. */
2523 m->notifygen++;
2524
2525 /* Notify every unit that might be interested, which might be multiple. */
2526 u1 = manager_get_unit_by_pid_cgroup(m, ucred->pid);
2527 u2 = hashmap_get(m->watch_pids, PID_TO_PTR(ucred->pid));
2528 array = hashmap_get(m->watch_pids, PID_TO_PTR(-ucred->pid));
2529 if (array) {
2530 size_t k = 0;
2531
2532 while (array[k])
2533 k++;
2534
2535 array_copy = newdup(Unit*, array, k+1);
2536 if (!array_copy)
2537 log_oom();
2538 }
2539 /* And now invoke the per-unit callbacks. Note that manager_invoke_notify_message() will handle duplicate units
2540 * make sure we only invoke each unit's handler once. */
2541 if (u1) {
2542 manager_invoke_notify_message(m, u1, ucred, tags, fds);
2543 found = true;
2544 }
2545 if (u2) {
2546 manager_invoke_notify_message(m, u2, ucred, tags, fds);
2547 found = true;
2548 }
2549 if (array_copy)
2550 for (size_t i = 0; array_copy[i]; i++) {
2551 manager_invoke_notify_message(m, array_copy[i], ucred, tags, fds);
2552 found = true;
2553 }
2554
2555 if (!found)
2556 log_warning("Cannot find unit for notify message of PID "PID_FMT", ignoring.", ucred->pid);
2557
2558 if (fdset_size(fds) > 0)
2559 log_warning("Got extra auxiliary fds with notification message, closing them.");
2560
2561 return 0;
2562 }
2563
2564 static void manager_invoke_sigchld_event(
2565 Manager *m,
2566 Unit *u,
2567 const siginfo_t *si) {
2568
2569 assert(m);
2570 assert(u);
2571 assert(si);
2572
2573 /* Already invoked the handler of this unit in this iteration? Then don't process this again */
2574 if (u->sigchldgen == m->sigchldgen)
2575 return;
2576 u->sigchldgen = m->sigchldgen;
2577
2578 log_unit_debug(u, "Child "PID_FMT" belongs to %s.", si->si_pid, u->id);
2579 unit_unwatch_pid(u, si->si_pid);
2580
2581 if (UNIT_VTABLE(u)->sigchld_event)
2582 UNIT_VTABLE(u)->sigchld_event(u, si->si_pid, si->si_code, si->si_status);
2583 }
2584
2585 static int manager_dispatch_sigchld(sd_event_source *source, void *userdata) {
2586 Manager *m = userdata;
2587 siginfo_t si = {};
2588 int r;
2589
2590 assert(source);
2591 assert(m);
2592
2593 /* First we call waitid() for a PID and do not reap the zombie. That way we can still access /proc/$PID for it
2594 * while it is a zombie. */
2595
2596 if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) {
2597
2598 if (errno != ECHILD)
2599 log_error_errno(errno, "Failed to peek for child with waitid(), ignoring: %m");
2600
2601 goto turn_off;
2602 }
2603
2604 if (si.si_pid <= 0)
2605 goto turn_off;
2606
2607 if (IN_SET(si.si_code, CLD_EXITED, CLD_KILLED, CLD_DUMPED)) {
2608 _cleanup_free_ Unit **array_copy = NULL;
2609 _cleanup_free_ char *name = NULL;
2610 Unit *u1, *u2, **array;
2611
2612 (void) get_process_comm(si.si_pid, &name);
2613
2614 log_debug("Child "PID_FMT" (%s) died (code=%s, status=%i/%s)",
2615 si.si_pid, strna(name),
2616 sigchld_code_to_string(si.si_code),
2617 si.si_status,
2618 strna(si.si_code == CLD_EXITED
2619 ? exit_status_to_string(si.si_status, EXIT_STATUS_FULL)
2620 : signal_to_string(si.si_status)));
2621
2622 /* Increase the generation counter used for filtering out duplicate unit invocations */
2623 m->sigchldgen++;
2624
2625 /* And now figure out the unit this belongs to, it might be multiple... */
2626 u1 = manager_get_unit_by_pid_cgroup(m, si.si_pid);
2627 u2 = hashmap_get(m->watch_pids, PID_TO_PTR(si.si_pid));
2628 array = hashmap_get(m->watch_pids, PID_TO_PTR(-si.si_pid));
2629 if (array) {
2630 size_t n = 0;
2631
2632 /* Count how many entries the array has */
2633 while (array[n])
2634 n++;
2635
2636 /* Make a copy of the array so that we don't trip up on the array changing beneath us */
2637 array_copy = newdup(Unit*, array, n+1);
2638 if (!array_copy)
2639 log_oom();
2640 }
2641
2642 /* Finally, execute them all. Note that u1, u2 and the array might contain duplicates, but
2643 * that's fine, manager_invoke_sigchld_event() will ensure we only invoke the handlers once for
2644 * each iteration. */
2645 if (u1) {
2646 /* We check for oom condition, in case we got SIGCHLD before the oom notification.
2647 * We only do this for the cgroup the PID belonged to. */
2648 (void) unit_check_oom(u1);
2649
2650 /* This only logs for now. In the future when the interface for kills/notifications
2651 * is more stable we can extend service results table similar to how kernel oom kills
2652 * are managed. */
2653 (void) unit_check_oomd_kill(u1);
2654
2655 manager_invoke_sigchld_event(m, u1, &si);
2656 }
2657 if (u2)
2658 manager_invoke_sigchld_event(m, u2, &si);
2659 if (array_copy)
2660 for (size_t i = 0; array_copy[i]; i++)
2661 manager_invoke_sigchld_event(m, array_copy[i], &si);
2662 }
2663
2664 /* And now, we actually reap the zombie. */
2665 if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) {
2666 log_error_errno(errno, "Failed to dequeue child, ignoring: %m");
2667 return 0;
2668 }
2669
2670 return 0;
2671
2672 turn_off:
2673 /* All children processed for now, turn off event source */
2674
2675 r = sd_event_source_set_enabled(m->sigchld_event_source, SD_EVENT_OFF);
2676 if (r < 0)
2677 return log_error_errno(r, "Failed to disable SIGCHLD event source: %m");
2678
2679 return 0;
2680 }
2681
2682 static void manager_start_target(Manager *m, const char *name, JobMode mode) {
2683 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2684 int r;
2685
2686 log_debug("Activating special unit %s", name);
2687
2688 r = manager_add_job_by_name(m, JOB_START, name, mode, NULL, &error, NULL);
2689 if (r < 0)
2690 log_error("Failed to enqueue %s job: %s", name, bus_error_message(&error, r));
2691 }
2692
2693 static void manager_handle_ctrl_alt_del(Manager *m) {
2694 /* If the user presses C-A-D more than
2695 * 7 times within 2s, we reboot/shutdown immediately,
2696 * unless it was disabled in system.conf */
2697
2698 if (ratelimit_below(&m->ctrl_alt_del_ratelimit) || m->cad_burst_action == EMERGENCY_ACTION_NONE)
2699 manager_start_target(m, SPECIAL_CTRL_ALT_DEL_TARGET, JOB_REPLACE_IRREVERSIBLY);
2700 else
2701 emergency_action(m, m->cad_burst_action, EMERGENCY_ACTION_WARN, NULL, -1,
2702 "Ctrl-Alt-Del was pressed more than 7 times within 2s");
2703 }
2704
2705 static int manager_dispatch_signal_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2706 Manager *m = userdata;
2707 ssize_t n;
2708 struct signalfd_siginfo sfsi;
2709 int r;
2710
2711 assert(m);
2712 assert(m->signal_fd == fd);
2713
2714 if (revents != EPOLLIN) {
2715 log_warning("Got unexpected events from signal file descriptor.");
2716 return 0;
2717 }
2718
2719 n = read(m->signal_fd, &sfsi, sizeof(sfsi));
2720 if (n != sizeof(sfsi)) {
2721 if (n >= 0) {
2722 log_warning("Truncated read from signal fd (%zu bytes), ignoring!", n);
2723 return 0;
2724 }
2725
2726 if (IN_SET(errno, EINTR, EAGAIN))
2727 return 0;
2728
2729 /* We return an error here, which will kill this handler,
2730 * to avoid a busy loop on read error. */
2731 return log_error_errno(errno, "Reading from signal fd failed: %m");
2732 }
2733
2734 log_received_signal(sfsi.ssi_signo == SIGCHLD ||
2735 (sfsi.ssi_signo == SIGTERM && MANAGER_IS_USER(m))
2736 ? LOG_DEBUG : LOG_INFO,
2737 &sfsi);
2738
2739 switch (sfsi.ssi_signo) {
2740
2741 case SIGCHLD:
2742 r = sd_event_source_set_enabled(m->sigchld_event_source, SD_EVENT_ON);
2743 if (r < 0)
2744 log_warning_errno(r, "Failed to enable SIGCHLD event source, ignoring: %m");
2745
2746 break;
2747
2748 case SIGTERM:
2749 if (MANAGER_IS_SYSTEM(m)) {
2750 /* This is for compatibility with the original sysvinit */
2751 if (verify_run_space_and_log("Refusing to reexecute") < 0)
2752 break;
2753
2754 m->objective = MANAGER_REEXECUTE;
2755 break;
2756 }
2757
2758 _fallthrough_;
2759 case SIGINT:
2760 if (MANAGER_IS_SYSTEM(m))
2761 manager_handle_ctrl_alt_del(m);
2762 else
2763 manager_start_target(m, SPECIAL_EXIT_TARGET,
2764 JOB_REPLACE_IRREVERSIBLY);
2765 break;
2766
2767 case SIGWINCH:
2768 /* This is a nop on non-init */
2769 if (MANAGER_IS_SYSTEM(m))
2770 manager_start_target(m, SPECIAL_KBREQUEST_TARGET, JOB_REPLACE);
2771
2772 break;
2773
2774 case SIGPWR:
2775 /* This is a nop on non-init */
2776 if (MANAGER_IS_SYSTEM(m))
2777 manager_start_target(m, SPECIAL_SIGPWR_TARGET, JOB_REPLACE);
2778
2779 break;
2780
2781 case SIGUSR1:
2782 if (manager_dbus_is_running(m, false)) {
2783 log_info("Trying to reconnect to bus...");
2784
2785 (void) bus_init_api(m);
2786
2787 if (MANAGER_IS_SYSTEM(m))
2788 (void) bus_init_system(m);
2789 } else {
2790 log_info("Starting D-Bus service...");
2791 manager_start_target(m, SPECIAL_DBUS_SERVICE, JOB_REPLACE);
2792 }
2793
2794 break;
2795
2796 case SIGUSR2: {
2797 _cleanup_free_ char *dump = NULL;
2798
2799 r = manager_get_dump_string(m, &dump);
2800 if (r < 0) {
2801 log_warning_errno(errno, "Failed to acquire manager dump: %m");
2802 break;
2803 }
2804
2805 log_dump(LOG_INFO, dump);
2806 break;
2807 }
2808
2809 case SIGHUP:
2810 if (verify_run_space_and_log("Refusing to reload") < 0)
2811 break;
2812
2813 m->objective = MANAGER_RELOAD;
2814 break;
2815
2816 default: {
2817
2818 /* Starting SIGRTMIN+0 */
2819 static const struct {
2820 const char *target;
2821 JobMode mode;
2822 } target_table[] = {
2823 [0] = { SPECIAL_DEFAULT_TARGET, JOB_ISOLATE },
2824 [1] = { SPECIAL_RESCUE_TARGET, JOB_ISOLATE },
2825 [2] = { SPECIAL_EMERGENCY_TARGET, JOB_ISOLATE },
2826 [3] = { SPECIAL_HALT_TARGET, JOB_REPLACE_IRREVERSIBLY },
2827 [4] = { SPECIAL_POWEROFF_TARGET, JOB_REPLACE_IRREVERSIBLY },
2828 [5] = { SPECIAL_REBOOT_TARGET, JOB_REPLACE_IRREVERSIBLY },
2829 [6] = { SPECIAL_KEXEC_TARGET, JOB_REPLACE_IRREVERSIBLY },
2830 };
2831
2832 /* Starting SIGRTMIN+13, so that target halt and system halt are 10 apart */
2833 static const ManagerObjective objective_table[] = {
2834 [0] = MANAGER_HALT,
2835 [1] = MANAGER_POWEROFF,
2836 [2] = MANAGER_REBOOT,
2837 [3] = MANAGER_KEXEC,
2838 };
2839
2840 if ((int) sfsi.ssi_signo >= SIGRTMIN+0 &&
2841 (int) sfsi.ssi_signo < SIGRTMIN+(int) ELEMENTSOF(target_table)) {
2842 int idx = (int) sfsi.ssi_signo - SIGRTMIN;
2843 manager_start_target(m, target_table[idx].target,
2844 target_table[idx].mode);
2845 break;
2846 }
2847
2848 if ((int) sfsi.ssi_signo >= SIGRTMIN+13 &&
2849 (int) sfsi.ssi_signo < SIGRTMIN+13+(int) ELEMENTSOF(objective_table)) {
2850 m->objective = objective_table[sfsi.ssi_signo - SIGRTMIN - 13];
2851 break;
2852 }
2853
2854 switch (sfsi.ssi_signo - SIGRTMIN) {
2855
2856 case 20:
2857 manager_override_show_status(m, SHOW_STATUS_YES, "signal");
2858 break;
2859
2860 case 21:
2861 manager_override_show_status(m, SHOW_STATUS_NO, "signal");
2862 break;
2863
2864 case 22:
2865 manager_override_log_level(m, LOG_DEBUG);
2866 break;
2867
2868 case 23:
2869 manager_restore_original_log_level(m);
2870 break;
2871
2872 case 24:
2873 if (MANAGER_IS_USER(m)) {
2874 m->objective = MANAGER_EXIT;
2875 return 0;
2876 }
2877
2878 /* This is a nop on init */
2879 break;
2880
2881 case 26:
2882 case 29: /* compatibility: used to be mapped to LOG_TARGET_SYSLOG_OR_KMSG */
2883 manager_restore_original_log_target(m);
2884 break;
2885
2886 case 27:
2887 manager_override_log_target(m, LOG_TARGET_CONSOLE);
2888 break;
2889
2890 case 28:
2891 manager_override_log_target(m, LOG_TARGET_KMSG);
2892 break;
2893
2894 default:
2895 log_warning("Got unhandled signal <%s>.", signal_to_string(sfsi.ssi_signo));
2896 }
2897 }}
2898
2899 return 0;
2900 }
2901
2902 static int manager_dispatch_time_change_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2903 Manager *m = userdata;
2904 Unit *u;
2905
2906 assert(m);
2907 assert(m->time_change_fd == fd);
2908
2909 log_struct(LOG_DEBUG,
2910 "MESSAGE_ID=" SD_MESSAGE_TIME_CHANGE_STR,
2911 LOG_MESSAGE("Time has been changed"));
2912
2913 /* Restart the watch */
2914 (void) manager_setup_time_change(m);
2915
2916 HASHMAP_FOREACH(u, m->units)
2917 if (UNIT_VTABLE(u)->time_change)
2918 UNIT_VTABLE(u)->time_change(u);
2919
2920 return 0;
2921 }
2922
2923 static int manager_dispatch_timezone_change(
2924 sd_event_source *source,
2925 const struct inotify_event *e,
2926 void *userdata) {
2927
2928 Manager *m = userdata;
2929 int changed;
2930 Unit *u;
2931
2932 assert(m);
2933
2934 log_debug("inotify event for /etc/localtime");
2935
2936 changed = manager_read_timezone_stat(m);
2937 if (changed <= 0)
2938 return changed;
2939
2940 /* Something changed, restart the watch, to ensure we watch the new /etc/localtime if it changed */
2941 (void) manager_setup_timezone_change(m);
2942
2943 /* Read the new timezone */
2944 tzset();
2945
2946 log_debug("Timezone has been changed (now: %s).", tzname[daylight]);
2947
2948 HASHMAP_FOREACH(u, m->units)
2949 if (UNIT_VTABLE(u)->timezone_change)
2950 UNIT_VTABLE(u)->timezone_change(u);
2951
2952 return 0;
2953 }
2954
2955 static int manager_dispatch_idle_pipe_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2956 Manager *m = userdata;
2957
2958 assert(m);
2959 assert(m->idle_pipe[2] == fd);
2960
2961 /* There's at least one Type=idle child that just gave up on us waiting for the boot process to complete. Let's
2962 * now turn off any further console output if there's at least one service that needs console access, so that
2963 * from now on our own output should not spill into that service's output anymore. After all, we support
2964 * Type=idle only to beautify console output and it generally is set on services that want to own the console
2965 * exclusively without our interference. */
2966 m->no_console_output = m->n_on_console > 0;
2967
2968 /* Acknowledge the child's request, and let all all other children know too that they shouldn't wait any longer
2969 * by closing the pipes towards them, which is what they are waiting for. */
2970 manager_close_idle_pipe(m);
2971
2972 return 0;
2973 }
2974
2975 static int manager_dispatch_jobs_in_progress(sd_event_source *source, usec_t usec, void *userdata) {
2976 Manager *m = userdata;
2977 int r;
2978
2979 assert(m);
2980 assert(source);
2981
2982 manager_print_jobs_in_progress(m);
2983
2984 r = sd_event_source_set_time_relative(source, JOBS_IN_PROGRESS_PERIOD_USEC);
2985 if (r < 0)
2986 return r;
2987
2988 return sd_event_source_set_enabled(source, SD_EVENT_ONESHOT);
2989 }
2990
2991 int manager_loop(Manager *m) {
2992 RateLimit rl = { .interval = 1*USEC_PER_SEC, .burst = 50000 };
2993 int r;
2994
2995 assert(m);
2996 assert(m->objective == MANAGER_OK); /* Ensure manager_startup() has been called */
2997
2998 manager_check_finished(m);
2999
3000 /* There might still be some zombies hanging around from before we were exec()'ed. Let's reap them. */
3001 r = sd_event_source_set_enabled(m->sigchld_event_source, SD_EVENT_ON);
3002 if (r < 0)
3003 return log_error_errno(r, "Failed to enable SIGCHLD event source: %m");
3004
3005 while (m->objective == MANAGER_OK) {
3006 usec_t wait_usec, watchdog_usec;
3007
3008 watchdog_usec = manager_get_watchdog(m, WATCHDOG_RUNTIME);
3009 if (m->runtime_watchdog_running)
3010 (void) watchdog_ping();
3011 else if (timestamp_is_set(watchdog_usec))
3012 manager_retry_runtime_watchdog(m);
3013
3014 if (!ratelimit_below(&rl)) {
3015 /* Yay, something is going seriously wrong, pause a little */
3016 log_warning("Looping too fast. Throttling execution a little.");
3017 sleep(1);
3018 }
3019
3020 if (manager_dispatch_load_queue(m) > 0)
3021 continue;
3022
3023 if (manager_dispatch_gc_job_queue(m) > 0)
3024 continue;
3025
3026 if (manager_dispatch_gc_unit_queue(m) > 0)
3027 continue;
3028
3029 if (manager_dispatch_cleanup_queue(m) > 0)
3030 continue;
3031
3032 if (manager_dispatch_cgroup_realize_queue(m) > 0)
3033 continue;
3034
3035 if (manager_dispatch_start_when_upheld_queue(m) > 0)
3036 continue;
3037
3038 if (manager_dispatch_stop_when_bound_queue(m) > 0)
3039 continue;
3040
3041 if (manager_dispatch_stop_when_unneeded_queue(m) > 0)
3042 continue;
3043
3044 if (manager_dispatch_dbus_queue(m) > 0)
3045 continue;
3046
3047 /* Sleep for watchdog runtime wait time */
3048 if (timestamp_is_set(watchdog_usec))
3049 wait_usec = watchdog_runtime_wait();
3050 else
3051 wait_usec = USEC_INFINITY;
3052
3053 r = sd_event_run(m->event, wait_usec);
3054 if (r < 0)
3055 return log_error_errno(r, "Failed to run event loop: %m");
3056 }
3057
3058 return m->objective;
3059 }
3060
3061 int manager_load_unit_from_dbus_path(Manager *m, const char *s, sd_bus_error *e, Unit **_u) {
3062 _cleanup_free_ char *n = NULL;
3063 sd_id128_t invocation_id;
3064 Unit *u;
3065 int r;
3066
3067 assert(m);
3068 assert(s);
3069 assert(_u);
3070
3071 r = unit_name_from_dbus_path(s, &n);
3072 if (r < 0)
3073 return r;
3074
3075 /* Permit addressing units by invocation ID: if the passed bus path is suffixed by a 128bit ID then we use it
3076 * as invocation ID. */
3077 r = sd_id128_from_string(n, &invocation_id);
3078 if (r >= 0) {
3079 u = hashmap_get(m->units_by_invocation_id, &invocation_id);
3080 if (u) {
3081 *_u = u;
3082 return 0;
3083 }
3084
3085 return sd_bus_error_setf(e, BUS_ERROR_NO_UNIT_FOR_INVOCATION_ID,
3086 "No unit with the specified invocation ID " SD_ID128_FORMAT_STR " known.",
3087 SD_ID128_FORMAT_VAL(invocation_id));
3088 }
3089
3090 /* If this didn't work, we check if this is a unit name */
3091 if (!unit_name_is_valid(n, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) {
3092 _cleanup_free_ char *nn = NULL;
3093
3094 nn = cescape(n);
3095 return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS,
3096 "Unit name %s is neither a valid invocation ID nor unit name.", strnull(nn));
3097 }
3098
3099 r = manager_load_unit(m, n, NULL, e, &u);
3100 if (r < 0)
3101 return r;
3102
3103 *_u = u;
3104 return 0;
3105 }
3106
3107 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
3108 const char *p;
3109 unsigned id;
3110 Job *j;
3111 int r;
3112
3113 assert(m);
3114 assert(s);
3115 assert(_j);
3116
3117 p = startswith(s, "/org/freedesktop/systemd1/job/");
3118 if (!p)
3119 return -EINVAL;
3120
3121 r = safe_atou(p, &id);
3122 if (r < 0)
3123 return r;
3124
3125 j = manager_get_job(m, id);
3126 if (!j)
3127 return -ENOENT;
3128
3129 *_j = j;
3130
3131 return 0;
3132 }
3133
3134 void manager_send_unit_audit(Manager *m, Unit *u, int type, bool success) {
3135
3136 #if HAVE_AUDIT
3137 _cleanup_free_ char *p = NULL;
3138 const char *msg;
3139 int audit_fd, r;
3140
3141 if (!MANAGER_IS_SYSTEM(m))
3142 return;
3143
3144 audit_fd = get_audit_fd();
3145 if (audit_fd < 0)
3146 return;
3147
3148 /* Don't generate audit events if the service was already
3149 * started and we're just deserializing */
3150 if (MANAGER_IS_RELOADING(m))
3151 return;
3152
3153 if (u->type != UNIT_SERVICE)
3154 return;
3155
3156 r = unit_name_to_prefix_and_instance(u->id, &p);
3157 if (r < 0) {
3158 log_error_errno(r, "Failed to extract prefix and instance of unit name: %m");
3159 return;
3160 }
3161
3162 msg = strjoina("unit=", p);
3163 if (audit_log_user_comm_message(audit_fd, type, msg, "systemd", NULL, NULL, NULL, success) < 0) {
3164 if (errno == EPERM)
3165 /* We aren't allowed to send audit messages?
3166 * Then let's not retry again. */
3167 close_audit_fd();
3168 else
3169 log_warning_errno(errno, "Failed to send audit message: %m");
3170 }
3171 #endif
3172
3173 }
3174
3175 void manager_send_unit_plymouth(Manager *m, Unit *u) {
3176 static const union sockaddr_union sa = PLYMOUTH_SOCKET;
3177 _cleanup_free_ char *message = NULL;
3178 _cleanup_close_ int fd = -1;
3179 int n = 0;
3180
3181 /* Don't generate plymouth events if the service was already
3182 * started and we're just deserializing */
3183 if (MANAGER_IS_RELOADING(m))
3184 return;
3185
3186 if (!MANAGER_IS_SYSTEM(m))
3187 return;
3188
3189 if (detect_container() > 0)
3190 return;
3191
3192 if (!IN_SET(u->type, UNIT_SERVICE, UNIT_MOUNT, UNIT_SWAP))
3193 return;
3194
3195 /* We set SOCK_NONBLOCK here so that we rather drop the
3196 * message then wait for plymouth */
3197 fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
3198 if (fd < 0) {
3199 log_error_errno(errno, "socket() failed: %m");
3200 return;
3201 }
3202
3203 if (connect(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0) {
3204 if (!IN_SET(errno, EAGAIN, ENOENT) && !ERRNO_IS_DISCONNECT(errno))
3205 log_error_errno(errno, "connect() failed: %m");
3206 return;
3207 }
3208
3209 if (asprintf(&message, "U\002%c%s%n", (int) (strlen(u->id) + 1), u->id, &n) < 0) {
3210 log_oom();
3211 return;
3212 }
3213
3214 errno = 0;
3215 if (write(fd, message, n + 1) != n + 1)
3216 if (!IN_SET(errno, EAGAIN, ENOENT) && !ERRNO_IS_DISCONNECT(errno))
3217 log_error_errno(errno, "Failed to write Plymouth message: %m");
3218 }
3219
3220 int manager_open_serialization(Manager *m, FILE **_f) {
3221 _cleanup_close_ int fd = -1;
3222 FILE *f;
3223
3224 assert(_f);
3225
3226 fd = open_serialization_fd("systemd-state");
3227 if (fd < 0)
3228 return fd;
3229
3230 f = take_fdopen(&fd, "w+");
3231 if (!f)
3232 return -errno;
3233
3234 *_f = f;
3235 return 0;
3236 }
3237
3238 static bool manager_timestamp_shall_serialize(ManagerTimestamp t) {
3239
3240 if (!in_initrd())
3241 return true;
3242
3243 /* The following timestamps only apply to the host system, hence only serialize them there */
3244 return !IN_SET(t,
3245 MANAGER_TIMESTAMP_USERSPACE, MANAGER_TIMESTAMP_FINISH,
3246 MANAGER_TIMESTAMP_SECURITY_START, MANAGER_TIMESTAMP_SECURITY_FINISH,
3247 MANAGER_TIMESTAMP_GENERATORS_START, MANAGER_TIMESTAMP_GENERATORS_FINISH,
3248 MANAGER_TIMESTAMP_UNITS_LOAD_START, MANAGER_TIMESTAMP_UNITS_LOAD_FINISH);
3249 }
3250
3251 #define DESTROY_IPC_FLAG (UINT32_C(1) << 31)
3252
3253 static void manager_serialize_uid_refs_internal(
3254 FILE *f,
3255 Hashmap *uid_refs,
3256 const char *field_name) {
3257
3258 void *p, *k;
3259
3260 assert(f);
3261 assert(field_name);
3262
3263 /* Serialize the UID reference table. Or actually, just the IPC destruction flag of it, as
3264 * the actual counter of it is better rebuild after a reload/reexec. */
3265
3266 HASHMAP_FOREACH_KEY(p, k, uid_refs) {
3267 uint32_t c;
3268 uid_t uid;
3269
3270 uid = PTR_TO_UID(k);
3271 c = PTR_TO_UINT32(p);
3272
3273 if (!(c & DESTROY_IPC_FLAG))
3274 continue;
3275
3276 (void) serialize_item_format(f, field_name, UID_FMT, uid);
3277 }
3278 }
3279
3280 static void manager_serialize_uid_refs(Manager *m, FILE *f) {
3281 manager_serialize_uid_refs_internal(f, m->uid_refs, "destroy-ipc-uid");
3282 }
3283
3284 static void manager_serialize_gid_refs(Manager *m, FILE *f) {
3285 manager_serialize_uid_refs_internal(f, m->gid_refs, "destroy-ipc-gid");
3286 }
3287
3288 int manager_serialize(
3289 Manager *m,
3290 FILE *f,
3291 FDSet *fds,
3292 bool switching_root) {
3293
3294 const char *t;
3295 Unit *u;
3296 int r;
3297
3298 assert(m);
3299 assert(f);
3300 assert(fds);
3301
3302 _cleanup_(manager_reloading_stopp) _unused_ Manager *reloading = manager_reloading_start(m);
3303
3304 (void) serialize_item_format(f, "current-job-id", "%" PRIu32, m->current_job_id);
3305 (void) serialize_item_format(f, "n-installed-jobs", "%u", m->n_installed_jobs);
3306 (void) serialize_item_format(f, "n-failed-jobs", "%u", m->n_failed_jobs);
3307 (void) serialize_bool(f, "taint-usr", m->taint_usr);
3308 (void) serialize_bool(f, "ready-sent", m->ready_sent);
3309 (void) serialize_bool(f, "taint-logged", m->taint_logged);
3310 (void) serialize_bool(f, "service-watchdogs", m->service_watchdogs);
3311
3312 /* After switching root, udevd has not been started yet. So, enumeration results should not be emitted. */
3313 (void) serialize_bool(f, "honor-device-enumeration", !switching_root);
3314
3315 if (m->show_status_overridden != _SHOW_STATUS_INVALID)
3316 (void) serialize_item(f, "show-status-overridden",
3317 show_status_to_string(m->show_status_overridden));
3318
3319 if (m->log_level_overridden)
3320 (void) serialize_item_format(f, "log-level-override", "%i", log_get_max_level());
3321 if (m->log_target_overridden)
3322 (void) serialize_item(f, "log-target-override", log_target_to_string(log_get_target()));
3323
3324 (void) serialize_usec(f, "runtime-watchdog-overridden", m->watchdog_overridden[WATCHDOG_RUNTIME]);
3325 (void) serialize_usec(f, "reboot-watchdog-overridden", m->watchdog_overridden[WATCHDOG_REBOOT]);
3326 (void) serialize_usec(f, "kexec-watchdog-overridden", m->watchdog_overridden[WATCHDOG_KEXEC]);
3327
3328 for (ManagerTimestamp q = 0; q < _MANAGER_TIMESTAMP_MAX; q++) {
3329 _cleanup_free_ char *joined = NULL;
3330
3331 if (!manager_timestamp_shall_serialize(q))
3332 continue;
3333
3334 joined = strjoin(manager_timestamp_to_string(q), "-timestamp");
3335 if (!joined)
3336 return log_oom();
3337
3338 (void) serialize_dual_timestamp(f, joined, m->timestamps + q);
3339 }
3340
3341 if (!switching_root)
3342 (void) serialize_strv(f, "env", m->client_environment);
3343
3344 if (m->notify_fd >= 0) {
3345 r = serialize_fd(f, fds, "notify-fd", m->notify_fd);
3346 if (r < 0)
3347 return r;
3348
3349 (void) serialize_item(f, "notify-socket", m->notify_socket);
3350 }
3351
3352 if (m->cgroups_agent_fd >= 0) {
3353 r = serialize_fd(f, fds, "cgroups-agent-fd", m->cgroups_agent_fd);
3354 if (r < 0)
3355 return r;
3356 }
3357
3358 if (m->user_lookup_fds[0] >= 0) {
3359 int copy0, copy1;
3360
3361 copy0 = fdset_put_dup(fds, m->user_lookup_fds[0]);
3362 if (copy0 < 0)
3363 return log_error_errno(copy0, "Failed to add user lookup fd to serialization: %m");
3364
3365 copy1 = fdset_put_dup(fds, m->user_lookup_fds[1]);
3366 if (copy1 < 0)
3367 return log_error_errno(copy1, "Failed to add user lookup fd to serialization: %m");
3368
3369 (void) serialize_item_format(f, "user-lookup", "%i %i", copy0, copy1);
3370 }
3371
3372 bus_track_serialize(m->subscribed, f, "subscribed");
3373
3374 r = dynamic_user_serialize(m, f, fds);
3375 if (r < 0)
3376 return r;
3377
3378 manager_serialize_uid_refs(m, f);
3379 manager_serialize_gid_refs(m, f);
3380
3381 r = exec_runtime_serialize(m, f, fds);
3382 if (r < 0)
3383 return r;
3384
3385 (void) fputc('\n', f);
3386
3387 HASHMAP_FOREACH_KEY(u, t, m->units) {
3388 if (u->id != t)
3389 continue;
3390
3391 /* Start marker */
3392 fputs(u->id, f);
3393 fputc('\n', f);
3394
3395 r = unit_serialize(u, f, fds, !switching_root);
3396 if (r < 0)
3397 return r;
3398 }
3399
3400 r = fflush_and_check(f);
3401 if (r < 0)
3402 return log_error_errno(r, "Failed to flush serialization: %m");
3403
3404 r = bus_fdset_add_all(m, fds);
3405 if (r < 0)
3406 return log_error_errno(r, "Failed to add bus sockets to serialization: %m");
3407
3408 return 0;
3409 }
3410
3411 static int manager_deserialize_one_unit(Manager *m, const char *name, FILE *f, FDSet *fds) {
3412 Unit *u;
3413 int r;
3414
3415 r = manager_load_unit(m, name, NULL, NULL, &u);
3416 if (r < 0) {
3417 if (r == -ENOMEM)
3418 return r;
3419 return log_notice_errno(r, "Failed to load unit \"%s\", skipping deserialization: %m", name);
3420 }
3421
3422 r = unit_deserialize(u, f, fds);
3423 if (r < 0) {
3424 if (r == -ENOMEM)
3425 return r;
3426 return log_notice_errno(r, "Failed to deserialize unit \"%s\", skipping: %m", name);
3427 }
3428
3429 return 0;
3430 }
3431
3432 static int manager_deserialize_units(Manager *m, FILE *f, FDSet *fds) {
3433 const char *unit_name;
3434 int r;
3435
3436 for (;;) {
3437 _cleanup_free_ char *line = NULL;
3438 /* Start marker */
3439 r = read_line(f, LONG_LINE_MAX, &line);
3440 if (r < 0)
3441 return log_error_errno(r, "Failed to read serialization line: %m");
3442 if (r == 0)
3443 break;
3444
3445 unit_name = strstrip(line);
3446
3447 r = manager_deserialize_one_unit(m, unit_name, f, fds);
3448 if (r == -ENOMEM)
3449 return r;
3450 if (r < 0) {
3451 r = unit_deserialize_skip(f);
3452 if (r < 0)
3453 return r;
3454 }
3455 }
3456
3457 return 0;
3458 }
3459
3460 usec_t manager_get_watchdog(Manager *m, WatchdogType t) {
3461 assert(m);
3462
3463 if (MANAGER_IS_USER(m))
3464 return USEC_INFINITY;
3465
3466 if (timestamp_is_set(m->watchdog_overridden[t]))
3467 return m->watchdog_overridden[t];
3468
3469 return m->watchdog[t];
3470 }
3471
3472 void manager_set_watchdog(Manager *m, WatchdogType t, usec_t timeout) {
3473 int r = 0;
3474
3475 assert(m);
3476
3477 if (MANAGER_IS_USER(m))
3478 return;
3479
3480 if (m->watchdog[t] == timeout)
3481 return;
3482
3483 if (t == WATCHDOG_RUNTIME)
3484 if (!timestamp_is_set(m->watchdog_overridden[WATCHDOG_RUNTIME])) {
3485 if (timestamp_is_set(timeout)) {
3486 r = watchdog_set_timeout(&timeout);
3487
3488 if (r >= 0)
3489 m->runtime_watchdog_running = true;
3490 } else {
3491 watchdog_close(true);
3492 m->runtime_watchdog_running = false;
3493 }
3494 }
3495
3496 m->watchdog[t] = timeout;
3497 }
3498
3499 int manager_override_watchdog(Manager *m, WatchdogType t, usec_t timeout) {
3500 int r = 0;
3501
3502 assert(m);
3503
3504 if (MANAGER_IS_USER(m))
3505 return 0;
3506
3507 if (m->watchdog_overridden[t] == timeout)
3508 return 0;
3509
3510 if (t == WATCHDOG_RUNTIME) {
3511 usec_t *p;
3512
3513 p = timestamp_is_set(timeout) ? &timeout : &m->watchdog[t];
3514 if (timestamp_is_set(*p)) {
3515 r = watchdog_set_timeout(p);
3516
3517 if (r >= 0)
3518 m->runtime_watchdog_running = true;
3519 } else {
3520 watchdog_close(true);
3521 m->runtime_watchdog_running = false;
3522 }
3523 }
3524
3525 m->watchdog_overridden[t] = timeout;
3526
3527 return 0;
3528 }
3529
3530 void manager_retry_runtime_watchdog(Manager *m) {
3531 int r = 0;
3532
3533 assert(m);
3534
3535 if (timestamp_is_set(m->watchdog_overridden[WATCHDOG_RUNTIME]))
3536 r = watchdog_set_timeout(&m->watchdog_overridden[WATCHDOG_RUNTIME]);
3537 else
3538 r = watchdog_set_timeout(&m->watchdog[WATCHDOG_RUNTIME]);
3539
3540 if (r >= 0)
3541 m->runtime_watchdog_running = true;
3542 }
3543
3544 static void manager_deserialize_uid_refs_one_internal(
3545 Hashmap** uid_refs,
3546 const char *value) {
3547
3548 uid_t uid;
3549 uint32_t c;
3550 int r;
3551
3552 assert(uid_refs);
3553 assert(value);
3554
3555 r = parse_uid(value, &uid);
3556 if (r < 0 || uid == 0) {
3557 log_debug("Unable to parse UID/GID reference serialization: " UID_FMT, uid);
3558 return;
3559 }
3560
3561 if (hashmap_ensure_allocated(uid_refs, &trivial_hash_ops) < 0) {
3562 log_oom();
3563 return;
3564 }
3565
3566 c = PTR_TO_UINT32(hashmap_get(*uid_refs, UID_TO_PTR(uid)));
3567 if (c & DESTROY_IPC_FLAG)
3568 return;
3569
3570 c |= DESTROY_IPC_FLAG;
3571
3572 r = hashmap_replace(*uid_refs, UID_TO_PTR(uid), UINT32_TO_PTR(c));
3573 if (r < 0) {
3574 log_debug_errno(r, "Failed to add UID/GID reference entry: %m");
3575 return;
3576 }
3577 }
3578
3579 static void manager_deserialize_uid_refs_one(Manager *m, const char *value) {
3580 manager_deserialize_uid_refs_one_internal(&m->uid_refs, value);
3581 }
3582
3583 static void manager_deserialize_gid_refs_one(Manager *m, const char *value) {
3584 manager_deserialize_uid_refs_one_internal(&m->gid_refs, value);
3585 }
3586
3587 int manager_deserialize(Manager *m, FILE *f, FDSet *fds) {
3588 int r = 0;
3589
3590 assert(m);
3591 assert(f);
3592
3593 if (DEBUG_LOGGING) {
3594 if (fdset_isempty(fds))
3595 log_debug("No file descriptors passed");
3596 else {
3597 int fd;
3598
3599 FDSET_FOREACH(fd, fds) {
3600 _cleanup_free_ char *fn = NULL;
3601
3602 r = fd_get_path(fd, &fn);
3603 if (r < 0)
3604 log_debug_errno(r, "Received serialized fd %i → %m", fd);
3605 else
3606 log_debug("Received serialized fd %i → %s", fd, strna(fn));
3607 }
3608 }
3609 }
3610
3611 log_debug("Deserializing state...");
3612
3613 /* If we are not in reload mode yet, enter it now. Not that this is recursive, a caller might already have
3614 * increased it to non-zero, which is why we just increase it by one here and down again at the end of this
3615 * call. */
3616 _cleanup_(manager_reloading_stopp) _unused_ Manager *reloading = manager_reloading_start(m);
3617
3618 for (;;) {
3619 _cleanup_free_ char *line = NULL;
3620 const char *val, *l;
3621
3622 r = read_line(f, LONG_LINE_MAX, &line);
3623 if (r < 0)
3624 return log_error_errno(r, "Failed to read serialization line: %m");
3625 if (r == 0)
3626 break;
3627
3628 l = strstrip(line);
3629 if (isempty(l)) /* end marker */
3630 break;
3631
3632 if ((val = startswith(l, "current-job-id="))) {
3633 uint32_t id;
3634
3635 if (safe_atou32(val, &id) < 0)
3636 log_notice("Failed to parse current job id value '%s', ignoring.", val);
3637 else
3638 m->current_job_id = MAX(m->current_job_id, id);
3639
3640 } else if ((val = startswith(l, "n-installed-jobs="))) {
3641 uint32_t n;
3642
3643 if (safe_atou32(val, &n) < 0)
3644 log_notice("Failed to parse installed jobs counter '%s', ignoring.", val);
3645 else
3646 m->n_installed_jobs += n;
3647
3648 } else if ((val = startswith(l, "n-failed-jobs="))) {
3649 uint32_t n;
3650
3651 if (safe_atou32(val, &n) < 0)
3652 log_notice("Failed to parse failed jobs counter '%s', ignoring.", val);
3653 else
3654 m->n_failed_jobs += n;
3655
3656 } else if ((val = startswith(l, "taint-usr="))) {
3657 int b;
3658
3659 b = parse_boolean(val);
3660 if (b < 0)
3661 log_notice("Failed to parse taint /usr flag '%s', ignoring.", val);
3662 else
3663 m->taint_usr = m->taint_usr || b;
3664
3665 } else if ((val = startswith(l, "ready-sent="))) {
3666 int b;
3667
3668 b = parse_boolean(val);
3669 if (b < 0)
3670 log_notice("Failed to parse ready-sent flag '%s', ignoring.", val);
3671 else
3672 m->ready_sent = m->ready_sent || b;
3673
3674 } else if ((val = startswith(l, "taint-logged="))) {
3675 int b;
3676
3677 b = parse_boolean(val);
3678 if (b < 0)
3679 log_notice("Failed to parse taint-logged flag '%s', ignoring.", val);
3680 else
3681 m->taint_logged = m->taint_logged || b;
3682
3683 } else if ((val = startswith(l, "service-watchdogs="))) {
3684 int b;
3685
3686 b = parse_boolean(val);
3687 if (b < 0)
3688 log_notice("Failed to parse service-watchdogs flag '%s', ignoring.", val);
3689 else
3690 m->service_watchdogs = b;
3691
3692 } else if ((val = startswith(l, "honor-device-enumeration="))) {
3693 int b;
3694
3695 b = parse_boolean(val);
3696 if (b < 0)
3697 log_notice("Failed to parse honor-device-enumeration flag '%s', ignoring.", val);
3698 else
3699 m->honor_device_enumeration = b;
3700
3701 } else if ((val = startswith(l, "show-status-overridden="))) {
3702 ShowStatus s;
3703
3704 s = show_status_from_string(val);
3705 if (s < 0)
3706 log_notice("Failed to parse show-status-overridden flag '%s', ignoring.", val);
3707 else
3708 manager_override_show_status(m, s, "deserialize");
3709
3710 } else if ((val = startswith(l, "log-level-override="))) {
3711 int level;
3712
3713 level = log_level_from_string(val);
3714 if (level < 0)
3715 log_notice("Failed to parse log-level-override value '%s', ignoring.", val);
3716 else
3717 manager_override_log_level(m, level);
3718
3719 } else if ((val = startswith(l, "log-target-override="))) {
3720 LogTarget target;
3721
3722 target = log_target_from_string(val);
3723 if (target < 0)
3724 log_notice("Failed to parse log-target-override value '%s', ignoring.", val);
3725 else
3726 manager_override_log_target(m, target);
3727
3728 } else if ((val = startswith(l, "runtime-watchdog-overridden="))) {
3729 usec_t t;
3730
3731 if (deserialize_usec(val, &t) < 0)
3732 log_notice("Failed to parse runtime-watchdog-overridden value '%s', ignoring.", val);
3733 else
3734 manager_override_watchdog(m, WATCHDOG_RUNTIME, t);
3735
3736 } else if ((val = startswith(l, "reboot-watchdog-overridden="))) {
3737 usec_t t;
3738
3739 if (deserialize_usec(val, &t) < 0)
3740 log_notice("Failed to parse reboot-watchdog-overridden value '%s', ignoring.", val);
3741 else
3742 manager_override_watchdog(m, WATCHDOG_REBOOT, t);
3743
3744 } else if ((val = startswith(l, "kexec-watchdog-overridden="))) {
3745 usec_t t;
3746
3747 if (deserialize_usec(val, &t) < 0)
3748 log_notice("Failed to parse kexec-watchdog-overridden value '%s', ignoring.", val);
3749 else
3750 manager_override_watchdog(m, WATCHDOG_KEXEC, t);
3751
3752 } else if (startswith(l, "env=")) {
3753 r = deserialize_environment(l + 4, &m->client_environment);
3754 if (r < 0)
3755 log_notice_errno(r, "Failed to parse environment entry: \"%s\", ignoring: %m", l);
3756
3757 } else if ((val = startswith(l, "notify-fd="))) {
3758 int fd;
3759
3760 if (safe_atoi(val, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
3761 log_notice("Failed to parse notify fd, ignoring: \"%s\"", val);
3762 else {
3763 m->notify_event_source = sd_event_source_unref(m->notify_event_source);
3764 safe_close(m->notify_fd);
3765 m->notify_fd = fdset_remove(fds, fd);
3766 }
3767
3768 } else if ((val = startswith(l, "notify-socket="))) {
3769 r = free_and_strdup(&m->notify_socket, val);
3770 if (r < 0)
3771 return r;
3772
3773 } else if ((val = startswith(l, "cgroups-agent-fd="))) {
3774 int fd;
3775
3776 if (safe_atoi(val, &fd) < 0 || fd < 0 || !fdset_contains(fds, fd))
3777 log_notice("Failed to parse cgroups agent fd, ignoring.: %s", val);
3778 else {
3779 m->cgroups_agent_event_source = sd_event_source_unref(m->cgroups_agent_event_source);
3780 safe_close(m->cgroups_agent_fd);
3781 m->cgroups_agent_fd = fdset_remove(fds, fd);
3782 }
3783
3784 } else if ((val = startswith(l, "user-lookup="))) {
3785 int fd0, fd1;
3786
3787 if (sscanf(val, "%i %i", &fd0, &fd1) != 2 || fd0 < 0 || fd1 < 0 || fd0 == fd1 || !fdset_contains(fds, fd0) || !fdset_contains(fds, fd1))
3788 log_notice("Failed to parse user lookup fd, ignoring: %s", val);
3789 else {
3790 m->user_lookup_event_source = sd_event_source_unref(m->user_lookup_event_source);
3791 safe_close_pair(m->user_lookup_fds);
3792 m->user_lookup_fds[0] = fdset_remove(fds, fd0);
3793 m->user_lookup_fds[1] = fdset_remove(fds, fd1);
3794 }
3795
3796 } else if ((val = startswith(l, "dynamic-user=")))
3797 dynamic_user_deserialize_one(m, val, fds);
3798 else if ((val = startswith(l, "destroy-ipc-uid=")))
3799 manager_deserialize_uid_refs_one(m, val);
3800 else if ((val = startswith(l, "destroy-ipc-gid=")))
3801 manager_deserialize_gid_refs_one(m, val);
3802 else if ((val = startswith(l, "exec-runtime=")))
3803 (void) exec_runtime_deserialize_one(m, val, fds);
3804 else if ((val = startswith(l, "subscribed="))) {
3805
3806 if (strv_extend(&m->deserialized_subscribed, val) < 0)
3807 return -ENOMEM;
3808
3809 } else {
3810 ManagerTimestamp q;
3811
3812 for (q = 0; q < _MANAGER_TIMESTAMP_MAX; q++) {
3813 val = startswith(l, manager_timestamp_to_string(q));
3814 if (!val)
3815 continue;
3816
3817 val = startswith(val, "-timestamp=");
3818 if (val)
3819 break;
3820 }
3821
3822 if (q < _MANAGER_TIMESTAMP_MAX) /* found it */
3823 (void) deserialize_dual_timestamp(val, m->timestamps + q);
3824 else if (!startswith(l, "kdbus-fd=")) /* ignore kdbus */
3825 log_notice("Unknown serialization item '%s', ignoring.", l);
3826 }
3827 }
3828
3829 return manager_deserialize_units(m, f, fds);
3830 }
3831
3832 int manager_reload(Manager *m) {
3833 _cleanup_(manager_reloading_stopp) Manager *reloading = NULL;
3834 _cleanup_fdset_free_ FDSet *fds = NULL;
3835 _cleanup_fclose_ FILE *f = NULL;
3836 int r;
3837
3838 assert(m);
3839
3840 r = manager_open_serialization(m, &f);
3841 if (r < 0)
3842 return log_error_errno(r, "Failed to create serialization file: %m");
3843
3844 fds = fdset_new();
3845 if (!fds)
3846 return log_oom();
3847
3848 /* We are officially in reload mode from here on. */
3849 reloading = manager_reloading_start(m);
3850
3851 r = manager_serialize(m, f, fds, false);
3852 if (r < 0)
3853 return r;
3854
3855 if (fseeko(f, 0, SEEK_SET) < 0)
3856 return log_error_errno(errno, "Failed to seek to beginning of serialization: %m");
3857
3858 /* 💀 This is the point of no return, from here on there is no way back. 💀 */
3859 reloading = NULL;
3860
3861 bus_manager_send_reloading(m, true);
3862
3863 /* Start by flushing out all jobs and units, all generated units, all runtime environments, all dynamic users
3864 * and everything else that is worth flushing out. We'll get it all back from the serialization — if we need
3865 * it.*/
3866
3867 manager_clear_jobs_and_units(m);
3868 lookup_paths_flush_generator(&m->lookup_paths);
3869 lookup_paths_free(&m->lookup_paths);
3870 exec_runtime_vacuum(m);
3871 dynamic_user_vacuum(m, false);
3872 m->uid_refs = hashmap_free(m->uid_refs);
3873 m->gid_refs = hashmap_free(m->gid_refs);
3874
3875 r = lookup_paths_init(&m->lookup_paths, m->unit_file_scope, 0, NULL);
3876 if (r < 0)
3877 log_warning_errno(r, "Failed to initialize path lookup table, ignoring: %m");
3878
3879 (void) manager_run_environment_generators(m);
3880 (void) manager_run_generators(m);
3881
3882 lookup_paths_log(&m->lookup_paths);
3883
3884 /* We flushed out generated files, for which we don't watch mtime, so we should flush the old map. */
3885 manager_free_unit_name_maps(m);
3886
3887 /* First, enumerate what we can from kernel and suchlike */
3888 manager_enumerate_perpetual(m);
3889 manager_enumerate(m);
3890
3891 /* Second, deserialize our stored data */
3892 r = manager_deserialize(m, f, fds);
3893 if (r < 0)
3894 log_warning_errno(r, "Deserialization failed, proceeding anyway: %m");
3895
3896 /* We don't need the serialization anymore */
3897 f = safe_fclose(f);
3898
3899 /* Re-register notify_fd as event source, and set up other sockets/communication channels we might need */
3900 (void) manager_setup_notify(m);
3901 (void) manager_setup_cgroups_agent(m);
3902 (void) manager_setup_user_lookup_fd(m);
3903
3904 /* Third, fire things up! */
3905 manager_coldplug(m);
3906
3907 /* Clean up runtime objects no longer referenced */
3908 manager_vacuum(m);
3909
3910 /* Clean up deserialized tracked clients */
3911 m->deserialized_subscribed = strv_free(m->deserialized_subscribed);
3912
3913 /* Consider the reload process complete now. */
3914 assert(m->n_reloading > 0);
3915 m->n_reloading--;
3916
3917 /* On manager reloading, device tag data should exists, thus, we should honor the results of device
3918 * enumeration. The flag should be always set correctly by the serialized data, but it may fail. So,
3919 * let's always set the flag here for safety. */
3920 m->honor_device_enumeration = true;
3921
3922 manager_ready(m);
3923
3924 m->send_reloading_done = true;
3925 return 0;
3926 }
3927
3928 void manager_reset_failed(Manager *m) {
3929 Unit *u;
3930
3931 assert(m);
3932
3933 HASHMAP_FOREACH(u, m->units)
3934 unit_reset_failed(u);
3935 }
3936
3937 bool manager_unit_inactive_or_pending(Manager *m, const char *name) {
3938 Unit *u;
3939
3940 assert(m);
3941 assert(name);
3942
3943 /* Returns true if the unit is inactive or going down */
3944 u = manager_get_unit(m, name);
3945 if (!u)
3946 return true;
3947
3948 return unit_inactive_or_pending(u);
3949 }
3950
3951 static void log_taint_string(Manager *m) {
3952 _cleanup_free_ char *taint = NULL;
3953
3954 assert(m);
3955
3956 if (MANAGER_IS_USER(m) || m->taint_logged)
3957 return;
3958
3959 m->taint_logged = true; /* only check for taint once */
3960
3961 taint = manager_taint_string(m);
3962 if (isempty(taint))
3963 return;
3964
3965 log_struct(LOG_NOTICE,
3966 LOG_MESSAGE("System is tainted: %s", taint),
3967 "TAINT=%s", taint,
3968 "MESSAGE_ID=" SD_MESSAGE_TAINTED_STR);
3969 }
3970
3971 static void manager_notify_finished(Manager *m) {
3972 char userspace[FORMAT_TIMESPAN_MAX], initrd[FORMAT_TIMESPAN_MAX], kernel[FORMAT_TIMESPAN_MAX], sum[FORMAT_TIMESPAN_MAX];
3973 usec_t firmware_usec, loader_usec, kernel_usec, initrd_usec, userspace_usec, total_usec;
3974
3975 if (MANAGER_IS_TEST_RUN(m))
3976 return;
3977
3978 if (MANAGER_IS_SYSTEM(m) && detect_container() <= 0) {
3979 char ts[FORMAT_TIMESPAN_MAX];
3980 char buf[FORMAT_TIMESPAN_MAX + STRLEN(" (firmware) + ") + FORMAT_TIMESPAN_MAX + STRLEN(" (loader) + ")]
3981 = {};
3982 char *p = buf;
3983 size_t size = sizeof buf;
3984
3985 /* Note that MANAGER_TIMESTAMP_KERNEL's monotonic value is always at 0, and
3986 * MANAGER_TIMESTAMP_FIRMWARE's and MANAGER_TIMESTAMP_LOADER's monotonic value should be considered
3987 * negative values. */
3988
3989 firmware_usec = m->timestamps[MANAGER_TIMESTAMP_FIRMWARE].monotonic - m->timestamps[MANAGER_TIMESTAMP_LOADER].monotonic;
3990 loader_usec = m->timestamps[MANAGER_TIMESTAMP_LOADER].monotonic - m->timestamps[MANAGER_TIMESTAMP_KERNEL].monotonic;
3991 userspace_usec = m->timestamps[MANAGER_TIMESTAMP_FINISH].monotonic - m->timestamps[MANAGER_TIMESTAMP_USERSPACE].monotonic;
3992 total_usec = m->timestamps[MANAGER_TIMESTAMP_FIRMWARE].monotonic + m->timestamps[MANAGER_TIMESTAMP_FINISH].monotonic;
3993
3994 if (firmware_usec > 0)
3995 size = strpcpyf(&p, size, "%s (firmware) + ", format_timespan(ts, sizeof(ts), firmware_usec, USEC_PER_MSEC));
3996 if (loader_usec > 0)
3997 size = strpcpyf(&p, size, "%s (loader) + ", format_timespan(ts, sizeof(ts), loader_usec, USEC_PER_MSEC));
3998
3999 if (dual_timestamp_is_set(&m->timestamps[MANAGER_TIMESTAMP_INITRD])) {
4000
4001 /* The initrd case on bare-metal*/
4002 kernel_usec = m->timestamps[MANAGER_TIMESTAMP_INITRD].monotonic - m->timestamps[MANAGER_TIMESTAMP_KERNEL].monotonic;
4003 initrd_usec = m->timestamps[MANAGER_TIMESTAMP_USERSPACE].monotonic - m->timestamps[MANAGER_TIMESTAMP_INITRD].monotonic;
4004
4005 log_struct(LOG_INFO,
4006 "MESSAGE_ID=" SD_MESSAGE_STARTUP_FINISHED_STR,
4007 "KERNEL_USEC="USEC_FMT, kernel_usec,
4008 "INITRD_USEC="USEC_FMT, initrd_usec,
4009 "USERSPACE_USEC="USEC_FMT, userspace_usec,
4010 LOG_MESSAGE("Startup finished in %s%s (kernel) + %s (initrd) + %s (userspace) = %s.",
4011 buf,
4012 format_timespan(kernel, sizeof(kernel), kernel_usec, USEC_PER_MSEC),
4013 format_timespan(initrd, sizeof(initrd), initrd_usec, USEC_PER_MSEC),
4014 format_timespan(userspace, sizeof(userspace), userspace_usec, USEC_PER_MSEC),
4015 format_timespan(sum, sizeof(sum), total_usec, USEC_PER_MSEC)));
4016 } else {
4017 /* The initrd-less case on bare-metal*/
4018
4019 kernel_usec = m->timestamps[MANAGER_TIMESTAMP_USERSPACE].monotonic - m->timestamps[MANAGER_TIMESTAMP_KERNEL].monotonic;
4020 initrd_usec = 0;
4021
4022 log_struct(LOG_INFO,
4023 "MESSAGE_ID=" SD_MESSAGE_STARTUP_FINISHED_STR,
4024 "KERNEL_USEC="USEC_FMT, kernel_usec,
4025 "USERSPACE_USEC="USEC_FMT, userspace_usec,
4026 LOG_MESSAGE("Startup finished in %s%s (kernel) + %s (userspace) = %s.",
4027 buf,
4028 format_timespan(kernel, sizeof(kernel), kernel_usec, USEC_PER_MSEC),
4029 format_timespan(userspace, sizeof(userspace), userspace_usec, USEC_PER_MSEC),
4030 format_timespan(sum, sizeof(sum), total_usec, USEC_PER_MSEC)));
4031 }
4032 } else {
4033 /* The container and --user case */
4034 firmware_usec = loader_usec = initrd_usec = kernel_usec = 0;
4035 total_usec = userspace_usec = m->timestamps[MANAGER_TIMESTAMP_FINISH].monotonic - m->timestamps[MANAGER_TIMESTAMP_USERSPACE].monotonic;
4036
4037 log_struct(LOG_INFO,
4038 "MESSAGE_ID=" SD_MESSAGE_USER_STARTUP_FINISHED_STR,
4039 "USERSPACE_USEC="USEC_FMT, userspace_usec,
4040 LOG_MESSAGE("Startup finished in %s.",
4041 format_timespan(sum, sizeof(sum), total_usec, USEC_PER_MSEC)));
4042 }
4043
4044 bus_manager_send_finished(m, firmware_usec, loader_usec, kernel_usec, initrd_usec, userspace_usec, total_usec);
4045
4046 sd_notifyf(false,
4047 m->ready_sent ? "STATUS=Startup finished in %s."
4048 : "READY=1\n"
4049 "STATUS=Startup finished in %s.",
4050 format_timespan(sum, sizeof(sum), total_usec, USEC_PER_MSEC));
4051 m->ready_sent = true;
4052
4053 log_taint_string(m);
4054 }
4055
4056 static void manager_send_ready(Manager *m) {
4057 assert(m);
4058
4059 /* We send READY=1 on reaching basic.target only when running in --user mode. */
4060 if (!MANAGER_IS_USER(m) || m->ready_sent)
4061 return;
4062
4063 m->ready_sent = true;
4064
4065 sd_notifyf(false,
4066 "READY=1\n"
4067 "STATUS=Reached " SPECIAL_BASIC_TARGET ".");
4068 }
4069
4070 static void manager_check_basic_target(Manager *m) {
4071 Unit *u;
4072
4073 assert(m);
4074
4075 /* Small shortcut */
4076 if (m->ready_sent && m->taint_logged)
4077 return;
4078
4079 u = manager_get_unit(m, SPECIAL_BASIC_TARGET);
4080 if (!u || !UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u)))
4081 return;
4082
4083 /* For user managers, send out READY=1 as soon as we reach basic.target */
4084 manager_send_ready(m);
4085
4086 /* Log the taint string as soon as we reach basic.target */
4087 log_taint_string(m);
4088 }
4089
4090 void manager_check_finished(Manager *m) {
4091 assert(m);
4092
4093 if (MANAGER_IS_RELOADING(m))
4094 return;
4095
4096 /* Verify that we have entered the event loop already, and not left it again. */
4097 if (!MANAGER_IS_RUNNING(m))
4098 return;
4099
4100 manager_check_basic_target(m);
4101
4102 if (hashmap_size(m->jobs) > 0) {
4103 if (m->jobs_in_progress_event_source)
4104 /* Ignore any failure, this is only for feedback */
4105 (void) sd_event_source_set_time(m->jobs_in_progress_event_source,
4106 manager_watch_jobs_next_time(m));
4107 return;
4108 }
4109
4110 /* The jobs hashmap tends to grow a lot during boot, and then it's not reused until shutdown. Let's
4111 kill the hashmap if it is relatively large. */
4112 if (hashmap_buckets(m->jobs) > hashmap_size(m->units) / 10)
4113 m->jobs = hashmap_free(m->jobs);
4114
4115 manager_flip_auto_status(m, false, "boot finished");
4116
4117 /* Notify Type=idle units that we are done now */
4118 manager_close_idle_pipe(m);
4119
4120 /* Turn off confirm spawn now */
4121 m->confirm_spawn = NULL;
4122
4123 /* No need to update ask password status when we're going non-interactive */
4124 manager_close_ask_password(m);
4125
4126 /* This is no longer the first boot */
4127 manager_set_first_boot(m, false);
4128
4129 if (MANAGER_IS_FINISHED(m))
4130 return;
4131
4132 dual_timestamp_get(m->timestamps + MANAGER_TIMESTAMP_FINISH);
4133
4134 manager_notify_finished(m);
4135
4136 manager_invalidate_startup_units(m);
4137 }
4138
4139 static bool generator_path_any(const char* const* paths) {
4140 char **path;
4141 bool found = false;
4142
4143 /* Optimize by skipping the whole process by not creating output directories
4144 * if no generators are found. */
4145 STRV_FOREACH(path, (char**) paths)
4146 if (access(*path, F_OK) == 0)
4147 found = true;
4148 else if (errno != ENOENT)
4149 log_warning_errno(errno, "Failed to open generator directory %s: %m", *path);
4150
4151 return found;
4152 }
4153
4154 static int manager_run_environment_generators(Manager *m) {
4155 char **tmp = NULL; /* this is only used in the forked process, no cleanup here */
4156 _cleanup_strv_free_ char **paths = NULL;
4157 void* args[] = {
4158 [STDOUT_GENERATE] = &tmp,
4159 [STDOUT_COLLECT] = &tmp,
4160 [STDOUT_CONSUME] = &m->transient_environment,
4161 };
4162 int r;
4163
4164 if (MANAGER_IS_TEST_RUN(m) && !(m->test_run_flags & MANAGER_TEST_RUN_ENV_GENERATORS))
4165 return 0;
4166
4167 paths = env_generator_binary_paths(MANAGER_IS_SYSTEM(m));
4168 if (!paths)
4169 return log_oom();
4170
4171 if (!generator_path_any((const char* const*) paths))
4172 return 0;
4173
4174 RUN_WITH_UMASK(0022)
4175 r = execute_directories((const char* const*) paths, DEFAULT_TIMEOUT_USEC, gather_environment,
4176 args, NULL, m->transient_environment,
4177 EXEC_DIR_PARALLEL | EXEC_DIR_IGNORE_ERRORS | EXEC_DIR_SET_SYSTEMD_EXEC_PID);
4178 return r;
4179 }
4180
4181 static int manager_run_generators(Manager *m) {
4182 _cleanup_strv_free_ char **paths = NULL;
4183 const char *argv[5];
4184 int r;
4185
4186 assert(m);
4187
4188 if (MANAGER_IS_TEST_RUN(m) && !(m->test_run_flags & MANAGER_TEST_RUN_GENERATORS))
4189 return 0;
4190
4191 paths = generator_binary_paths(m->unit_file_scope);
4192 if (!paths)
4193 return log_oom();
4194
4195 if (!generator_path_any((const char* const*) paths))
4196 return 0;
4197
4198 r = lookup_paths_mkdir_generator(&m->lookup_paths);
4199 if (r < 0) {
4200 log_error_errno(r, "Failed to create generator directories: %m");
4201 goto finish;
4202 }
4203
4204 argv[0] = NULL; /* Leave this empty, execute_directory() will fill something in */
4205 argv[1] = m->lookup_paths.generator;
4206 argv[2] = m->lookup_paths.generator_early;
4207 argv[3] = m->lookup_paths.generator_late;
4208 argv[4] = NULL;
4209
4210 RUN_WITH_UMASK(0022)
4211 (void) execute_directories((const char* const*) paths, DEFAULT_TIMEOUT_USEC, NULL, NULL,
4212 (char**) argv, m->transient_environment,
4213 EXEC_DIR_PARALLEL | EXEC_DIR_IGNORE_ERRORS | EXEC_DIR_SET_SYSTEMD_EXEC_PID);
4214
4215 r = 0;
4216
4217 finish:
4218 lookup_paths_trim_generator(&m->lookup_paths);
4219 return r;
4220 }
4221
4222 int manager_transient_environment_add(Manager *m, char **plus) {
4223 char **a;
4224
4225 assert(m);
4226
4227 if (strv_isempty(plus))
4228 return 0;
4229
4230 a = strv_env_merge(2, m->transient_environment, plus);
4231 if (!a)
4232 return log_oom();
4233
4234 sanitize_environment(a);
4235
4236 return strv_free_and_replace(m->transient_environment, a);
4237 }
4238
4239 int manager_client_environment_modify(
4240 Manager *m,
4241 char **minus,
4242 char **plus) {
4243
4244 char **a = NULL, **b = NULL, **l;
4245
4246 assert(m);
4247
4248 if (strv_isempty(minus) && strv_isempty(plus))
4249 return 0;
4250
4251 l = m->client_environment;
4252
4253 if (!strv_isempty(minus)) {
4254 a = strv_env_delete(l, 1, minus);
4255 if (!a)
4256 return -ENOMEM;
4257
4258 l = a;
4259 }
4260
4261 if (!strv_isempty(plus)) {
4262 b = strv_env_merge(2, l, plus);
4263 if (!b) {
4264 strv_free(a);
4265 return -ENOMEM;
4266 }
4267
4268 l = b;
4269 }
4270
4271 if (m->client_environment != l)
4272 strv_free(m->client_environment);
4273
4274 if (a != l)
4275 strv_free(a);
4276 if (b != l)
4277 strv_free(b);
4278
4279 m->client_environment = sanitize_environment(l);
4280 return 0;
4281 }
4282
4283 int manager_get_effective_environment(Manager *m, char ***ret) {
4284 char **l;
4285
4286 assert(m);
4287 assert(ret);
4288
4289 l = strv_env_merge(2, m->transient_environment, m->client_environment);
4290 if (!l)
4291 return -ENOMEM;
4292
4293 *ret = l;
4294 return 0;
4295 }
4296
4297 int manager_set_default_rlimits(Manager *m, struct rlimit **default_rlimit) {
4298 assert(m);
4299
4300 for (unsigned i = 0; i < _RLIMIT_MAX; i++) {
4301 m->rlimit[i] = mfree(m->rlimit[i]);
4302
4303 if (!default_rlimit[i])
4304 continue;
4305
4306 m->rlimit[i] = newdup(struct rlimit, default_rlimit[i], 1);
4307 if (!m->rlimit[i])
4308 return log_oom();
4309 }
4310
4311 return 0;
4312 }
4313
4314 void manager_recheck_dbus(Manager *m) {
4315 assert(m);
4316
4317 /* Connects to the bus if the dbus service and socket are running. If we are running in user mode this is all
4318 * it does. In system mode we'll also connect to the system bus (which will most likely just reuse the
4319 * connection of the API bus). That's because the system bus after all runs as service of the system instance,
4320 * while in the user instance we can assume it's already there. */
4321
4322 if (MANAGER_IS_RELOADING(m))
4323 return; /* don't check while we are reloading… */
4324
4325 if (manager_dbus_is_running(m, false)) {
4326 (void) bus_init_api(m);
4327
4328 if (MANAGER_IS_SYSTEM(m))
4329 (void) bus_init_system(m);
4330 } else {
4331 (void) bus_done_api(m);
4332
4333 if (MANAGER_IS_SYSTEM(m))
4334 (void) bus_done_system(m);
4335 }
4336 }
4337
4338 static bool manager_journal_is_running(Manager *m) {
4339 Unit *u;
4340
4341 assert(m);
4342
4343 if (MANAGER_IS_TEST_RUN(m))
4344 return false;
4345
4346 /* If we are the user manager we can safely assume that the journal is up */
4347 if (!MANAGER_IS_SYSTEM(m))
4348 return true;
4349
4350 /* Check that the socket is not only up, but in RUNNING state */
4351 u = manager_get_unit(m, SPECIAL_JOURNALD_SOCKET);
4352 if (!u)
4353 return false;
4354 if (SOCKET(u)->state != SOCKET_RUNNING)
4355 return false;
4356
4357 /* Similar, check if the daemon itself is fully up, too */
4358 u = manager_get_unit(m, SPECIAL_JOURNALD_SERVICE);
4359 if (!u)
4360 return false;
4361 if (!IN_SET(SERVICE(u)->state, SERVICE_RELOAD, SERVICE_RUNNING))
4362 return false;
4363
4364 return true;
4365 }
4366
4367 void disable_printk_ratelimit(void) {
4368 /* Disable kernel's printk ratelimit.
4369 *
4370 * Logging to /dev/kmsg is most useful during early boot and shutdown, where normal logging
4371 * mechanisms are not available. The semantics of this sysctl are such that any kernel command-line
4372 * setting takes precedence. */
4373 int r;
4374
4375 r = sysctl_write("kernel/printk_devkmsg", "on");
4376 if (r < 0)
4377 log_debug_errno(r, "Failed to set sysctl kernel.printk_devkmsg=on: %m");
4378 }
4379
4380 void manager_recheck_journal(Manager *m) {
4381
4382 assert(m);
4383
4384 /* Don't bother with this unless we are in the special situation of being PID 1 */
4385 if (getpid_cached() != 1)
4386 return;
4387
4388 /* Don't check this while we are reloading, things might still change */
4389 if (MANAGER_IS_RELOADING(m))
4390 return;
4391
4392 /* The journal is fully and entirely up? If so, let's permit logging to it, if that's configured. If the
4393 * journal is down, don't ever log to it, otherwise we might end up deadlocking ourselves as we might trigger
4394 * an activation ourselves we can't fulfill. */
4395 log_set_prohibit_ipc(!manager_journal_is_running(m));
4396 log_open();
4397 }
4398
4399 static ShowStatus manager_get_show_status(Manager *m) {
4400 assert(m);
4401
4402 if (MANAGER_IS_USER(m))
4403 return _SHOW_STATUS_INVALID;
4404
4405 if (m->show_status_overridden != _SHOW_STATUS_INVALID)
4406 return m->show_status_overridden;
4407
4408 return m->show_status;
4409 }
4410
4411 bool manager_get_show_status_on(Manager *m) {
4412 assert(m);
4413
4414 return show_status_on(manager_get_show_status(m));
4415 }
4416
4417 static void set_show_status_marker(bool b) {
4418 if (b)
4419 (void) touch("/run/systemd/show-status");
4420 else
4421 (void) unlink("/run/systemd/show-status");
4422 }
4423
4424 void manager_set_show_status(Manager *m, ShowStatus mode, const char *reason) {
4425 assert(m);
4426 assert(reason);
4427 assert(mode >= 0 && mode < _SHOW_STATUS_MAX);
4428
4429 if (MANAGER_IS_USER(m))
4430 return;
4431
4432 if (mode == m->show_status)
4433 return;
4434
4435 if (m->show_status_overridden == _SHOW_STATUS_INVALID) {
4436 bool enabled;
4437
4438 enabled = show_status_on(mode);
4439 log_debug("%s (%s) showing of status (%s).",
4440 enabled ? "Enabling" : "Disabling",
4441 strna(show_status_to_string(mode)),
4442 reason);
4443
4444 set_show_status_marker(enabled);
4445 }
4446
4447 m->show_status = mode;
4448 }
4449
4450 void manager_override_show_status(Manager *m, ShowStatus mode, const char *reason) {
4451 assert(m);
4452 assert(mode < _SHOW_STATUS_MAX);
4453
4454 if (MANAGER_IS_USER(m))
4455 return;
4456
4457 if (mode == m->show_status_overridden)
4458 return;
4459
4460 m->show_status_overridden = mode;
4461
4462 if (mode == _SHOW_STATUS_INVALID)
4463 mode = m->show_status;
4464
4465 log_debug("%s (%s) showing of status (%s).",
4466 m->show_status_overridden != _SHOW_STATUS_INVALID ? "Overriding" : "Restoring",
4467 strna(show_status_to_string(mode)),
4468 reason);
4469
4470 set_show_status_marker(show_status_on(mode));
4471 }
4472
4473 const char *manager_get_confirm_spawn(Manager *m) {
4474 static int last_errno = 0;
4475 struct stat st;
4476 int r;
4477
4478 assert(m);
4479
4480 /* Here's the deal: we want to test the validity of the console but don't want
4481 * PID1 to go through the whole console process which might block. But we also
4482 * want to warn the user only once if something is wrong with the console so we
4483 * cannot do the sanity checks after spawning our children. So here we simply do
4484 * really basic tests to hopefully trap common errors.
4485 *
4486 * If the console suddenly disappear at the time our children will really it
4487 * then they will simply fail to acquire it and a positive answer will be
4488 * assumed. New children will fall back to /dev/console though.
4489 *
4490 * Note: TTYs are devices that can come and go any time, and frequently aren't
4491 * available yet during early boot (consider a USB rs232 dongle...). If for any
4492 * reason the configured console is not ready, we fall back to the default
4493 * console. */
4494
4495 if (!m->confirm_spawn || path_equal(m->confirm_spawn, "/dev/console"))
4496 return m->confirm_spawn;
4497
4498 if (stat(m->confirm_spawn, &st) < 0) {
4499 r = -errno;
4500 goto fail;
4501 }
4502
4503 if (!S_ISCHR(st.st_mode)) {
4504 r = -ENOTTY;
4505 goto fail;
4506 }
4507
4508 last_errno = 0;
4509 return m->confirm_spawn;
4510
4511 fail:
4512 if (last_errno != r)
4513 last_errno = log_warning_errno(r, "Failed to open %s, using default console: %m", m->confirm_spawn);
4514
4515 return "/dev/console";
4516 }
4517
4518 void manager_set_first_boot(Manager *m, bool b) {
4519 assert(m);
4520
4521 if (!MANAGER_IS_SYSTEM(m))
4522 return;
4523
4524 if (m->first_boot != (int) b) {
4525 if (b)
4526 (void) touch("/run/systemd/first-boot");
4527 else
4528 (void) unlink("/run/systemd/first-boot");
4529 }
4530
4531 m->first_boot = b;
4532 }
4533
4534 void manager_disable_confirm_spawn(void) {
4535 (void) touch("/run/systemd/confirm_spawn_disabled");
4536 }
4537
4538 bool manager_is_confirm_spawn_disabled(Manager *m) {
4539 if (!m->confirm_spawn)
4540 return true;
4541
4542 return access("/run/systemd/confirm_spawn_disabled", F_OK) >= 0;
4543 }
4544
4545 static bool manager_should_show_status(Manager *m, StatusType type) {
4546 assert(m);
4547
4548 if (!MANAGER_IS_SYSTEM(m))
4549 return false;
4550
4551 if (m->no_console_output)
4552 return false;
4553
4554 if (!IN_SET(manager_state(m), MANAGER_INITIALIZING, MANAGER_STARTING, MANAGER_STOPPING))
4555 return false;
4556
4557 /* If we cannot find out the status properly, just proceed. */
4558 if (type != STATUS_TYPE_EMERGENCY && manager_check_ask_password(m) > 0)
4559 return false;
4560
4561 if (type == STATUS_TYPE_NOTICE && m->show_status != SHOW_STATUS_NO)
4562 return true;
4563
4564 return manager_get_show_status_on(m);
4565 }
4566
4567 void manager_status_printf(Manager *m, StatusType type, const char *status, const char *format, ...) {
4568 va_list ap;
4569
4570 /* If m is NULL, assume we're after shutdown and let the messages through. */
4571
4572 if (m && !manager_should_show_status(m, type))
4573 return;
4574
4575 /* XXX We should totally drop the check for ephemeral here
4576 * and thus effectively make 'Type=idle' pointless. */
4577 if (type == STATUS_TYPE_EPHEMERAL && m && m->n_on_console > 0)
4578 return;
4579
4580 va_start(ap, format);
4581 status_vprintf(status, SHOW_STATUS_ELLIPSIZE|(type == STATUS_TYPE_EPHEMERAL ? SHOW_STATUS_EPHEMERAL : 0), format, ap);
4582 va_end(ap);
4583 }
4584
4585 Set *manager_get_units_requiring_mounts_for(Manager *m, const char *path) {
4586 char p[strlen(path)+1];
4587
4588 assert(m);
4589 assert(path);
4590
4591 strcpy(p, path);
4592 path_simplify(p, false);
4593
4594 return hashmap_get(m->units_requiring_mounts_for, streq(p, "/") ? "" : p);
4595 }
4596
4597 int manager_update_failed_units(Manager *m, Unit *u, bool failed) {
4598 unsigned size;
4599 int r;
4600
4601 assert(m);
4602 assert(u->manager == m);
4603
4604 size = set_size(m->failed_units);
4605
4606 if (failed) {
4607 r = set_ensure_put(&m->failed_units, NULL, u);
4608 if (r < 0)
4609 return log_oom();
4610 } else
4611 (void) set_remove(m->failed_units, u);
4612
4613 if (set_size(m->failed_units) != size)
4614 bus_manager_send_change_signal(m);
4615
4616 return 0;
4617 }
4618
4619 ManagerState manager_state(Manager *m) {
4620 Unit *u;
4621
4622 assert(m);
4623
4624 /* Is the special shutdown target active or queued? If so, we are in shutdown state */
4625 u = manager_get_unit(m, SPECIAL_SHUTDOWN_TARGET);
4626 if (u && unit_active_or_pending(u))
4627 return MANAGER_STOPPING;
4628
4629 /* Did we ever finish booting? If not then we are still starting up */
4630 if (!MANAGER_IS_FINISHED(m)) {
4631
4632 u = manager_get_unit(m, SPECIAL_BASIC_TARGET);
4633 if (!u || !UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u)))
4634 return MANAGER_INITIALIZING;
4635
4636 return MANAGER_STARTING;
4637 }
4638
4639 if (MANAGER_IS_SYSTEM(m)) {
4640 /* Are the rescue or emergency targets active or queued? If so we are in maintenance state */
4641 u = manager_get_unit(m, SPECIAL_RESCUE_TARGET);
4642 if (u && unit_active_or_pending(u))
4643 return MANAGER_MAINTENANCE;
4644
4645 u = manager_get_unit(m, SPECIAL_EMERGENCY_TARGET);
4646 if (u && unit_active_or_pending(u))
4647 return MANAGER_MAINTENANCE;
4648 }
4649
4650 /* Are there any failed units? If so, we are in degraded mode */
4651 if (set_size(m->failed_units) > 0)
4652 return MANAGER_DEGRADED;
4653
4654 return MANAGER_RUNNING;
4655 }
4656
4657 static void manager_unref_uid_internal(
4658 Hashmap *uid_refs,
4659 uid_t uid,
4660 bool destroy_now,
4661 int (*_clean_ipc)(uid_t uid)) {
4662
4663 uint32_t c, n;
4664
4665 assert(uid_is_valid(uid));
4666 assert(_clean_ipc);
4667
4668 /* A generic implementation, covering both manager_unref_uid() and manager_unref_gid(), under the assumption
4669 * that uid_t and gid_t are actually defined the same way, with the same validity rules.
4670 *
4671 * We store a hashmap where the UID/GID is they key and the value is a 32bit reference counter, whose highest
4672 * bit is used as flag for marking UIDs/GIDs whose IPC objects to remove when the last reference to the UID/GID
4673 * is dropped. The flag is set to on, once at least one reference from a unit where RemoveIPC= is set is added
4674 * on a UID/GID. It is reset when the UID's/GID's reference counter drops to 0 again. */
4675
4676 assert_cc(sizeof(uid_t) == sizeof(gid_t));
4677 assert_cc(UID_INVALID == (uid_t) GID_INVALID);
4678
4679 if (uid == 0) /* We don't keep track of root, and will never destroy it */
4680 return;
4681
4682 c = PTR_TO_UINT32(hashmap_get(uid_refs, UID_TO_PTR(uid)));
4683
4684 n = c & ~DESTROY_IPC_FLAG;
4685 assert(n > 0);
4686 n--;
4687
4688 if (destroy_now && n == 0) {
4689 hashmap_remove(uid_refs, UID_TO_PTR(uid));
4690
4691 if (c & DESTROY_IPC_FLAG) {
4692 log_debug("%s " UID_FMT " is no longer referenced, cleaning up its IPC.",
4693 _clean_ipc == clean_ipc_by_uid ? "UID" : "GID",
4694 uid);
4695 (void) _clean_ipc(uid);
4696 }
4697 } else {
4698 c = n | (c & DESTROY_IPC_FLAG);
4699 assert_se(hashmap_update(uid_refs, UID_TO_PTR(uid), UINT32_TO_PTR(c)) >= 0);
4700 }
4701 }
4702
4703 void manager_unref_uid(Manager *m, uid_t uid, bool destroy_now) {
4704 manager_unref_uid_internal(m->uid_refs, uid, destroy_now, clean_ipc_by_uid);
4705 }
4706
4707 void manager_unref_gid(Manager *m, gid_t gid, bool destroy_now) {
4708 manager_unref_uid_internal(m->gid_refs, (uid_t) gid, destroy_now, clean_ipc_by_gid);
4709 }
4710
4711 static int manager_ref_uid_internal(
4712 Hashmap **uid_refs,
4713 uid_t uid,
4714 bool clean_ipc) {
4715
4716 uint32_t c, n;
4717 int r;
4718
4719 assert(uid_refs);
4720 assert(uid_is_valid(uid));
4721
4722 /* A generic implementation, covering both manager_ref_uid() and manager_ref_gid(), under the assumption
4723 * that uid_t and gid_t are actually defined the same way, with the same validity rules. */
4724
4725 assert_cc(sizeof(uid_t) == sizeof(gid_t));
4726 assert_cc(UID_INVALID == (uid_t) GID_INVALID);
4727
4728 if (uid == 0) /* We don't keep track of root, and will never destroy it */
4729 return 0;
4730
4731 r = hashmap_ensure_allocated(uid_refs, &trivial_hash_ops);
4732 if (r < 0)
4733 return r;
4734
4735 c = PTR_TO_UINT32(hashmap_get(*uid_refs, UID_TO_PTR(uid)));
4736
4737 n = c & ~DESTROY_IPC_FLAG;
4738 n++;
4739
4740 if (n & DESTROY_IPC_FLAG) /* check for overflow */
4741 return -EOVERFLOW;
4742
4743 c = n | (c & DESTROY_IPC_FLAG) | (clean_ipc ? DESTROY_IPC_FLAG : 0);
4744
4745 return hashmap_replace(*uid_refs, UID_TO_PTR(uid), UINT32_TO_PTR(c));
4746 }
4747
4748 int manager_ref_uid(Manager *m, uid_t uid, bool clean_ipc) {
4749 return manager_ref_uid_internal(&m->uid_refs, uid, clean_ipc);
4750 }
4751
4752 int manager_ref_gid(Manager *m, gid_t gid, bool clean_ipc) {
4753 return manager_ref_uid_internal(&m->gid_refs, (uid_t) gid, clean_ipc);
4754 }
4755
4756 static void manager_vacuum_uid_refs_internal(
4757 Hashmap *uid_refs,
4758 int (*_clean_ipc)(uid_t uid)) {
4759
4760 void *p, *k;
4761
4762 assert(_clean_ipc);
4763
4764 HASHMAP_FOREACH_KEY(p, k, uid_refs) {
4765 uint32_t c, n;
4766 uid_t uid;
4767
4768 uid = PTR_TO_UID(k);
4769 c = PTR_TO_UINT32(p);
4770
4771 n = c & ~DESTROY_IPC_FLAG;
4772 if (n > 0)
4773 continue;
4774
4775 if (c & DESTROY_IPC_FLAG) {
4776 log_debug("Found unreferenced %s " UID_FMT " after reload/reexec. Cleaning up.",
4777 _clean_ipc == clean_ipc_by_uid ? "UID" : "GID",
4778 uid);
4779 (void) _clean_ipc(uid);
4780 }
4781
4782 assert_se(hashmap_remove(uid_refs, k) == p);
4783 }
4784 }
4785
4786 static void manager_vacuum_uid_refs(Manager *m) {
4787 manager_vacuum_uid_refs_internal(m->uid_refs, clean_ipc_by_uid);
4788 }
4789
4790 static void manager_vacuum_gid_refs(Manager *m) {
4791 manager_vacuum_uid_refs_internal(m->gid_refs, clean_ipc_by_gid);
4792 }
4793
4794 static void manager_vacuum(Manager *m) {
4795 assert(m);
4796
4797 /* Release any dynamic users no longer referenced */
4798 dynamic_user_vacuum(m, true);
4799
4800 /* Release any references to UIDs/GIDs no longer referenced, and destroy any IPC owned by them */
4801 manager_vacuum_uid_refs(m);
4802 manager_vacuum_gid_refs(m);
4803
4804 /* Release any runtimes no longer referenced */
4805 exec_runtime_vacuum(m);
4806 }
4807
4808 int manager_dispatch_user_lookup_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
4809 struct buffer {
4810 uid_t uid;
4811 gid_t gid;
4812 char unit_name[UNIT_NAME_MAX+1];
4813 } _packed_ buffer;
4814
4815 Manager *m = userdata;
4816 ssize_t l;
4817 size_t n;
4818 Unit *u;
4819
4820 assert_se(source);
4821 assert_se(m);
4822
4823 /* Invoked whenever a child process succeeded resolving its user/group to use and sent us the resulting UID/GID
4824 * in a datagram. We parse the datagram here and pass it off to the unit, so that it can add a reference to the
4825 * UID/GID so that it can destroy the UID/GID's IPC objects when the reference counter drops to 0. */
4826
4827 l = recv(fd, &buffer, sizeof(buffer), MSG_DONTWAIT);
4828 if (l < 0) {
4829 if (IN_SET(errno, EINTR, EAGAIN))
4830 return 0;
4831
4832 return log_error_errno(errno, "Failed to read from user lookup fd: %m");
4833 }
4834
4835 if ((size_t) l <= offsetof(struct buffer, unit_name)) {
4836 log_warning("Received too short user lookup message, ignoring.");
4837 return 0;
4838 }
4839
4840 if ((size_t) l > offsetof(struct buffer, unit_name) + UNIT_NAME_MAX) {
4841 log_warning("Received too long user lookup message, ignoring.");
4842 return 0;
4843 }
4844
4845 if (!uid_is_valid(buffer.uid) && !gid_is_valid(buffer.gid)) {
4846 log_warning("Got user lookup message with invalid UID/GID pair, ignoring.");
4847 return 0;
4848 }
4849
4850 n = (size_t) l - offsetof(struct buffer, unit_name);
4851 if (memchr(buffer.unit_name, 0, n)) {
4852 log_warning("Received lookup message with embedded NUL character, ignoring.");
4853 return 0;
4854 }
4855
4856 buffer.unit_name[n] = 0;
4857 u = manager_get_unit(m, buffer.unit_name);
4858 if (!u) {
4859 log_debug("Got user lookup message but unit doesn't exist, ignoring.");
4860 return 0;
4861 }
4862
4863 log_unit_debug(u, "User lookup succeeded: uid=" UID_FMT " gid=" GID_FMT, buffer.uid, buffer.gid);
4864
4865 unit_notify_user_lookup(u, buffer.uid, buffer.gid);
4866 return 0;
4867 }
4868
4869 char *manager_taint_string(Manager *m) {
4870 _cleanup_free_ char *destination = NULL, *overflowuid = NULL, *overflowgid = NULL;
4871 char *buf, *e;
4872 int r;
4873
4874 /* Returns a "taint string", e.g. "local-hwclock:var-run-bad".
4875 * Only things that are detected at runtime should be tagged
4876 * here. For stuff that is set during compilation, emit a warning
4877 * in the configuration phase. */
4878
4879 assert(m);
4880
4881 buf = new(char, sizeof("split-usr:"
4882 "cgroups-missing:"
4883 "cgrousv1:"
4884 "local-hwclock:"
4885 "var-run-bad:"
4886 "overflowuid-not-65534:"
4887 "overflowgid-not-65534:"));
4888 if (!buf)
4889 return NULL;
4890
4891 e = buf;
4892 buf[0] = 0;
4893
4894 if (m->taint_usr)
4895 e = stpcpy(e, "split-usr:");
4896
4897 if (access("/proc/cgroups", F_OK) < 0)
4898 e = stpcpy(e, "cgroups-missing:");
4899
4900 if (cg_all_unified() == 0)
4901 e = stpcpy(e, "cgroupsv1:");
4902
4903 if (clock_is_localtime(NULL) > 0)
4904 e = stpcpy(e, "local-hwclock:");
4905
4906 r = readlink_malloc("/var/run", &destination);
4907 if (r < 0 || !PATH_IN_SET(destination, "../run", "/run"))
4908 e = stpcpy(e, "var-run-bad:");
4909
4910 r = read_one_line_file("/proc/sys/kernel/overflowuid", &overflowuid);
4911 if (r >= 0 && !streq(overflowuid, "65534"))
4912 e = stpcpy(e, "overflowuid-not-65534:");
4913
4914 r = read_one_line_file("/proc/sys/kernel/overflowgid", &overflowgid);
4915 if (r >= 0 && !streq(overflowgid, "65534"))
4916 e = stpcpy(e, "overflowgid-not-65534:");
4917
4918 /* remove the last ':' */
4919 if (e != buf)
4920 e[-1] = 0;
4921
4922 return buf;
4923 }
4924
4925 void manager_ref_console(Manager *m) {
4926 assert(m);
4927
4928 m->n_on_console++;
4929 }
4930
4931 void manager_unref_console(Manager *m) {
4932
4933 assert(m->n_on_console > 0);
4934 m->n_on_console--;
4935
4936 if (m->n_on_console == 0)
4937 m->no_console_output = false; /* unset no_console_output flag, since the console is definitely free now */
4938 }
4939
4940 void manager_override_log_level(Manager *m, int level) {
4941 _cleanup_free_ char *s = NULL;
4942 assert(m);
4943
4944 if (!m->log_level_overridden) {
4945 m->original_log_level = log_get_max_level();
4946 m->log_level_overridden = true;
4947 }
4948
4949 (void) log_level_to_string_alloc(level, &s);
4950 log_info("Setting log level to %s.", strna(s));
4951
4952 log_set_max_level(level);
4953 }
4954
4955 void manager_restore_original_log_level(Manager *m) {
4956 _cleanup_free_ char *s = NULL;
4957 assert(m);
4958
4959 if (!m->log_level_overridden)
4960 return;
4961
4962 (void) log_level_to_string_alloc(m->original_log_level, &s);
4963 log_info("Restoring log level to original (%s).", strna(s));
4964
4965 log_set_max_level(m->original_log_level);
4966 m->log_level_overridden = false;
4967 }
4968
4969 void manager_override_log_target(Manager *m, LogTarget target) {
4970 assert(m);
4971
4972 if (!m->log_target_overridden) {
4973 m->original_log_target = log_get_target();
4974 m->log_target_overridden = true;
4975 }
4976
4977 log_info("Setting log target to %s.", log_target_to_string(target));
4978 log_set_target(target);
4979 }
4980
4981 void manager_restore_original_log_target(Manager *m) {
4982 assert(m);
4983
4984 if (!m->log_target_overridden)
4985 return;
4986
4987 log_info("Restoring log target to original %s.", log_target_to_string(m->original_log_target));
4988
4989 log_set_target(m->original_log_target);
4990 m->log_target_overridden = false;
4991 }
4992
4993 ManagerTimestamp manager_timestamp_initrd_mangle(ManagerTimestamp s) {
4994 if (in_initrd() &&
4995 s >= MANAGER_TIMESTAMP_SECURITY_START &&
4996 s <= MANAGER_TIMESTAMP_UNITS_LOAD_FINISH)
4997 return s - MANAGER_TIMESTAMP_SECURITY_START + MANAGER_TIMESTAMP_INITRD_SECURITY_START;
4998 return s;
4999 }
5000
5001 static const char *const manager_state_table[_MANAGER_STATE_MAX] = {
5002 [MANAGER_INITIALIZING] = "initializing",
5003 [MANAGER_STARTING] = "starting",
5004 [MANAGER_RUNNING] = "running",
5005 [MANAGER_DEGRADED] = "degraded",
5006 [MANAGER_MAINTENANCE] = "maintenance",
5007 [MANAGER_STOPPING] = "stopping",
5008 };
5009
5010 DEFINE_STRING_TABLE_LOOKUP(manager_state, ManagerState);
5011
5012 static const char *const manager_timestamp_table[_MANAGER_TIMESTAMP_MAX] = {
5013 [MANAGER_TIMESTAMP_FIRMWARE] = "firmware",
5014 [MANAGER_TIMESTAMP_LOADER] = "loader",
5015 [MANAGER_TIMESTAMP_KERNEL] = "kernel",
5016 [MANAGER_TIMESTAMP_INITRD] = "initrd",
5017 [MANAGER_TIMESTAMP_USERSPACE] = "userspace",
5018 [MANAGER_TIMESTAMP_FINISH] = "finish",
5019 [MANAGER_TIMESTAMP_SECURITY_START] = "security-start",
5020 [MANAGER_TIMESTAMP_SECURITY_FINISH] = "security-finish",
5021 [MANAGER_TIMESTAMP_GENERATORS_START] = "generators-start",
5022 [MANAGER_TIMESTAMP_GENERATORS_FINISH] = "generators-finish",
5023 [MANAGER_TIMESTAMP_UNITS_LOAD_START] = "units-load-start",
5024 [MANAGER_TIMESTAMP_UNITS_LOAD_FINISH] = "units-load-finish",
5025 [MANAGER_TIMESTAMP_INITRD_SECURITY_START] = "initrd-security-start",
5026 [MANAGER_TIMESTAMP_INITRD_SECURITY_FINISH] = "initrd-security-finish",
5027 [MANAGER_TIMESTAMP_INITRD_GENERATORS_START] = "initrd-generators-start",
5028 [MANAGER_TIMESTAMP_INITRD_GENERATORS_FINISH] = "initrd-generators-finish",
5029 [MANAGER_TIMESTAMP_INITRD_UNITS_LOAD_START] = "initrd-units-load-start",
5030 [MANAGER_TIMESTAMP_INITRD_UNITS_LOAD_FINISH] = "initrd-units-load-finish",
5031 };
5032
5033 DEFINE_STRING_TABLE_LOOKUP(manager_timestamp, ManagerTimestamp);
5034
5035 static const char* const oom_policy_table[_OOM_POLICY_MAX] = {
5036 [OOM_CONTINUE] = "continue",
5037 [OOM_STOP] = "stop",
5038 [OOM_KILL] = "kill",
5039 };
5040
5041 DEFINE_STRING_TABLE_LOOKUP(oom_policy, OOMPolicy);
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