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Merge pull request #20996 from yuwata/udevadm-trigger-debug
[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 "generator-setup.h"
48 #include "hashmap.h"
49 #include "inotify-util.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 "manager-dump.h"
59 #include "manager-serialize.h"
60 #include "memory-util.h"
61 #include "mkdir.h"
62 #include "parse-util.h"
63 #include "path-lookup.h"
64 #include "path-util.h"
65 #include "process-util.h"
66 #include "ratelimit.h"
67 #include "rlimit-util.h"
68 #include "rm-rf.h"
69 #include "selinux-util.h"
70 #include "signal-util.h"
71 #include "socket-util.h"
72 #include "special.h"
73 #include "stat-util.h"
74 #include "string-table.h"
75 #include "string-util.h"
76 #include "strv.h"
77 #include "strxcpyx.h"
78 #include "sysctl-util.h"
79 #include "syslog-util.h"
80 #include "terminal-util.h"
81 #include "time-util.h"
82 #include "transaction.h"
83 #include "umask-util.h"
84 #include "unit-name.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 usec_t timeout;
121
122 if (MANAGER_IS_USER(m))
123 /* Let the user manager without a timeout show status quickly, so the system manager can make
124 * use of it, if it wants to. */
125 timeout = JOBS_IN_PROGRESS_WAIT_USEC * 2 / 3;
126 else if (show_status_on(m->show_status))
127 /* When status is on, just use the usual timeout. */
128 timeout = JOBS_IN_PROGRESS_WAIT_USEC;
129 else
130 timeout = JOBS_IN_PROGRESS_QUIET_WAIT_USEC;
131
132 return usec_add(now(CLOCK_MONOTONIC), timeout);
133 }
134
135 static void manager_watch_jobs_in_progress(Manager *m) {
136 usec_t next;
137 int r;
138
139 assert(m);
140
141 /* We do not want to show the cylon animation if the user
142 * needs to confirm service executions otherwise confirmation
143 * messages will be screwed by the cylon animation. */
144 if (!manager_is_confirm_spawn_disabled(m))
145 return;
146
147 if (m->jobs_in_progress_event_source)
148 return;
149
150 next = manager_watch_jobs_next_time(m);
151 r = sd_event_add_time(
152 m->event,
153 &m->jobs_in_progress_event_source,
154 CLOCK_MONOTONIC,
155 next, 0,
156 manager_dispatch_jobs_in_progress, m);
157 if (r < 0)
158 return;
159
160 (void) sd_event_source_set_description(m->jobs_in_progress_event_source, "manager-jobs-in-progress");
161 }
162
163 #define CYLON_BUFFER_EXTRA (2*STRLEN(ANSI_RED) + STRLEN(ANSI_HIGHLIGHT_RED) + 2*STRLEN(ANSI_NORMAL))
164
165 static void draw_cylon(char buffer[], size_t buflen, unsigned width, unsigned pos) {
166 char *p = buffer;
167
168 assert(buflen >= CYLON_BUFFER_EXTRA + width + 1);
169 assert(pos <= width+1); /* 0 or width+1 mean that the center light is behind the corner */
170
171 if (pos > 1) {
172 if (pos > 2)
173 p = mempset(p, ' ', pos-2);
174 if (log_get_show_color())
175 p = stpcpy(p, ANSI_RED);
176 *p++ = '*';
177 }
178
179 if (pos > 0 && pos <= width) {
180 if (log_get_show_color())
181 p = stpcpy(p, ANSI_HIGHLIGHT_RED);
182 *p++ = '*';
183 }
184
185 if (log_get_show_color())
186 p = stpcpy(p, ANSI_NORMAL);
187
188 if (pos < width) {
189 if (log_get_show_color())
190 p = stpcpy(p, ANSI_RED);
191 *p++ = '*';
192 if (pos < width-1)
193 p = mempset(p, ' ', width-1-pos);
194 if (log_get_show_color())
195 strcpy(p, ANSI_NORMAL);
196 }
197 }
198
199 static void manager_flip_auto_status(Manager *m, bool enable, const char *reason) {
200 assert(m);
201
202 if (enable) {
203 if (m->show_status == SHOW_STATUS_AUTO)
204 manager_set_show_status(m, SHOW_STATUS_TEMPORARY, reason);
205 } else {
206 if (m->show_status == SHOW_STATUS_TEMPORARY)
207 manager_set_show_status(m, SHOW_STATUS_AUTO, reason);
208 }
209 }
210
211 static void manager_print_jobs_in_progress(Manager *m) {
212 Job *j;
213 unsigned counter = 0, print_nr;
214 char cylon[6 + CYLON_BUFFER_EXTRA + 1];
215 unsigned cylon_pos;
216 uint64_t x;
217
218 assert(m);
219 assert(m->n_running_jobs > 0);
220
221 manager_flip_auto_status(m, true, "delay");
222
223 print_nr = (m->jobs_in_progress_iteration / JOBS_IN_PROGRESS_PERIOD_DIVISOR) % m->n_running_jobs;
224
225 HASHMAP_FOREACH(j, m->jobs)
226 if (j->state == JOB_RUNNING && counter++ == print_nr)
227 break;
228
229 /* m->n_running_jobs must be consistent with the contents of m->jobs,
230 * so the above loop must have succeeded in finding j. */
231 assert(counter == print_nr + 1);
232 assert(j);
233
234 cylon_pos = m->jobs_in_progress_iteration % 14;
235 if (cylon_pos >= 8)
236 cylon_pos = 14 - cylon_pos;
237 draw_cylon(cylon, sizeof(cylon), 6, cylon_pos);
238
239 m->jobs_in_progress_iteration++;
240
241 char job_of_n[STRLEN("( of ) ") + DECIMAL_STR_MAX(unsigned)*2] = "";
242 if (m->n_running_jobs > 1)
243 xsprintf(job_of_n, "(%u of %u) ", counter, m->n_running_jobs);
244
245 bool have_timeout = job_get_timeout(j, &x) > 0;
246
247 /* We want to use enough information for the user to identify previous lines talking about the same
248 * unit, but keep the message as short as possible. So if 'Starting foo.service' or 'Starting
249 * foo.service - Description' were used, 'foo.service' is enough here. On the other hand, if we used
250 * 'Starting Description' before, then we shall also use 'Description' here. So we pass NULL as the
251 * second argument to unit_status_string(). */
252 const char *ident = unit_status_string(j->unit, NULL);
253
254 const char *time = FORMAT_TIMESPAN(now(CLOCK_MONOTONIC) - j->begin_usec, 1*USEC_PER_SEC);
255 const char *limit = have_timeout ? FORMAT_TIMESPAN(x - j->begin_usec, 1*USEC_PER_SEC) : "no limit";
256
257 if (m->status_unit_format == STATUS_UNIT_FORMAT_DESCRIPTION)
258 /* When using 'Description', we effectively don't have enough space to show the nested status
259 * without ellipsization, so let's not even try. */
260 manager_status_printf(m, STATUS_TYPE_EPHEMERAL, cylon,
261 "%sA %s job is running for %s (%s / %s)",
262 job_of_n,
263 job_type_to_string(j->type),
264 ident,
265 time, limit);
266 else {
267 const char *status_text = unit_status_text(j->unit);
268
269 manager_status_printf(m, STATUS_TYPE_EPHEMERAL, cylon,
270 "%sJob %s/%s running (%s / %s)%s%s",
271 job_of_n,
272 ident,
273 job_type_to_string(j->type),
274 time, limit,
275 status_text ? ": " : "",
276 strempty(status_text));
277 }
278
279 sd_notifyf(false,
280 "STATUS=%sUser job %s/%s running (%s / %s)...",
281 job_of_n,
282 ident,
283 job_type_to_string(j->type),
284 time, limit);
285 m->status_ready = false;
286 }
287
288 static int have_ask_password(void) {
289 _cleanup_closedir_ DIR *dir = NULL;
290 struct dirent *de;
291
292 dir = opendir("/run/systemd/ask-password");
293 if (!dir) {
294 if (errno == ENOENT)
295 return false;
296 else
297 return -errno;
298 }
299
300 FOREACH_DIRENT_ALL(de, dir, return -errno) {
301 if (startswith(de->d_name, "ask."))
302 return true;
303 }
304 return false;
305 }
306
307 static int manager_dispatch_ask_password_fd(sd_event_source *source,
308 int fd, uint32_t revents, void *userdata) {
309 Manager *m = userdata;
310
311 assert(m);
312
313 (void) flush_fd(fd);
314
315 m->have_ask_password = have_ask_password();
316 if (m->have_ask_password < 0)
317 /* Log error but continue. Negative have_ask_password
318 * is treated as unknown status. */
319 log_error_errno(m->have_ask_password, "Failed to list /run/systemd/ask-password: %m");
320
321 return 0;
322 }
323
324 static void manager_close_ask_password(Manager *m) {
325 assert(m);
326
327 m->ask_password_event_source = sd_event_source_disable_unref(m->ask_password_event_source);
328 m->ask_password_inotify_fd = safe_close(m->ask_password_inotify_fd);
329 m->have_ask_password = -EINVAL;
330 }
331
332 static int manager_check_ask_password(Manager *m) {
333 int r;
334
335 assert(m);
336
337 if (!m->ask_password_event_source) {
338 assert(m->ask_password_inotify_fd < 0);
339
340 (void) mkdir_p_label("/run/systemd/ask-password", 0755);
341
342 m->ask_password_inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
343 if (m->ask_password_inotify_fd < 0)
344 return log_error_errno(errno, "Failed to create inotify object: %m");
345
346 r = inotify_add_watch_and_warn(m->ask_password_inotify_fd,
347 "/run/systemd/ask-password",
348 IN_CREATE|IN_DELETE|IN_MOVE);
349 if (r < 0) {
350 manager_close_ask_password(m);
351 return r;
352 }
353
354 r = sd_event_add_io(m->event, &m->ask_password_event_source,
355 m->ask_password_inotify_fd, EPOLLIN,
356 manager_dispatch_ask_password_fd, m);
357 if (r < 0) {
358 log_error_errno(r, "Failed to add event source for /run/systemd/ask-password: %m");
359 manager_close_ask_password(m);
360 return r;
361 }
362
363 (void) sd_event_source_set_description(m->ask_password_event_source, "manager-ask-password");
364
365 /* Queries might have been added meanwhile... */
366 manager_dispatch_ask_password_fd(m->ask_password_event_source,
367 m->ask_password_inotify_fd, EPOLLIN, m);
368 }
369
370 return m->have_ask_password;
371 }
372
373 static int manager_watch_idle_pipe(Manager *m) {
374 int r;
375
376 assert(m);
377
378 if (m->idle_pipe_event_source)
379 return 0;
380
381 if (m->idle_pipe[2] < 0)
382 return 0;
383
384 r = sd_event_add_io(m->event, &m->idle_pipe_event_source, m->idle_pipe[2], EPOLLIN, manager_dispatch_idle_pipe_fd, m);
385 if (r < 0)
386 return log_error_errno(r, "Failed to watch idle pipe: %m");
387
388 (void) sd_event_source_set_description(m->idle_pipe_event_source, "manager-idle-pipe");
389
390 return 0;
391 }
392
393 static void manager_close_idle_pipe(Manager *m) {
394 assert(m);
395
396 m->idle_pipe_event_source = sd_event_source_disable_unref(m->idle_pipe_event_source);
397
398 safe_close_pair(m->idle_pipe);
399 safe_close_pair(m->idle_pipe + 2);
400 }
401
402 static int manager_setup_time_change(Manager *m) {
403 int r;
404
405 assert(m);
406
407 if (MANAGER_IS_TEST_RUN(m))
408 return 0;
409
410 m->time_change_event_source = sd_event_source_disable_unref(m->time_change_event_source);
411 m->time_change_fd = safe_close(m->time_change_fd);
412
413 m->time_change_fd = time_change_fd();
414 if (m->time_change_fd < 0)
415 return log_error_errno(m->time_change_fd, "Failed to create timer change timer fd: %m");
416
417 r = sd_event_add_io(m->event, &m->time_change_event_source, m->time_change_fd, EPOLLIN, manager_dispatch_time_change_fd, m);
418 if (r < 0)
419 return log_error_errno(r, "Failed to create time change event source: %m");
420
421 /* Schedule this slightly earlier than the .timer event sources */
422 r = sd_event_source_set_priority(m->time_change_event_source, SD_EVENT_PRIORITY_NORMAL-1);
423 if (r < 0)
424 return log_error_errno(r, "Failed to set priority of time change event sources: %m");
425
426 (void) sd_event_source_set_description(m->time_change_event_source, "manager-time-change");
427
428 log_debug("Set up TFD_TIMER_CANCEL_ON_SET timerfd.");
429
430 return 0;
431 }
432
433 static int manager_read_timezone_stat(Manager *m) {
434 struct stat st;
435 bool changed;
436
437 assert(m);
438
439 /* Read the current stat() data of /etc/localtime so that we detect changes */
440 if (lstat("/etc/localtime", &st) < 0) {
441 log_debug_errno(errno, "Failed to stat /etc/localtime, ignoring: %m");
442 changed = m->etc_localtime_accessible;
443 m->etc_localtime_accessible = false;
444 } else {
445 usec_t k;
446
447 k = timespec_load(&st.st_mtim);
448 changed = !m->etc_localtime_accessible || k != m->etc_localtime_mtime;
449
450 m->etc_localtime_mtime = k;
451 m->etc_localtime_accessible = true;
452 }
453
454 return changed;
455 }
456
457 static int manager_setup_timezone_change(Manager *m) {
458 _cleanup_(sd_event_source_unrefp) sd_event_source *new_event = NULL;
459 int r;
460
461 assert(m);
462
463 if (MANAGER_IS_TEST_RUN(m))
464 return 0;
465
466 /* We watch /etc/localtime for three events: change of the link count (which might mean removal from /etc even
467 * though another link might be kept), renames, and file close operations after writing. Note we don't bother
468 * with IN_DELETE_SELF, as that would just report when the inode is removed entirely, i.e. after the link count
469 * went to zero and all fds to it are closed.
470 *
471 * Note that we never follow symlinks here. This is a simplification, but should cover almost all cases
472 * correctly.
473 *
474 * Note that we create the new event source first here, before releasing the old one. This should optimize
475 * behaviour as this way sd-event can reuse the old watch in case the inode didn't change. */
476
477 r = sd_event_add_inotify(m->event, &new_event, "/etc/localtime",
478 IN_ATTRIB|IN_MOVE_SELF|IN_CLOSE_WRITE|IN_DONT_FOLLOW, manager_dispatch_timezone_change, m);
479 if (r == -ENOENT) {
480 /* If the file doesn't exist yet, subscribe to /etc instead, and wait until it is created either by
481 * O_CREATE or by rename() */
482
483 log_debug_errno(r, "/etc/localtime doesn't exist yet, watching /etc instead.");
484 r = sd_event_add_inotify(m->event, &new_event, "/etc",
485 IN_CREATE|IN_MOVED_TO|IN_ONLYDIR, manager_dispatch_timezone_change, m);
486 }
487 if (r < 0)
488 return log_error_errno(r, "Failed to create timezone change event source: %m");
489
490 /* Schedule this slightly earlier than the .timer event sources */
491 r = sd_event_source_set_priority(new_event, SD_EVENT_PRIORITY_NORMAL-1);
492 if (r < 0)
493 return log_error_errno(r, "Failed to set priority of timezone change event sources: %m");
494
495 sd_event_source_unref(m->timezone_change_event_source);
496 m->timezone_change_event_source = TAKE_PTR(new_event);
497
498 return 0;
499 }
500
501 static int enable_special_signals(Manager *m) {
502 _cleanup_close_ int fd = -1;
503
504 assert(m);
505
506 if (MANAGER_IS_TEST_RUN(m))
507 return 0;
508
509 /* Enable that we get SIGINT on control-alt-del. In containers
510 * this will fail with EPERM (older) or EINVAL (newer), so
511 * ignore that. */
512 if (reboot(RB_DISABLE_CAD) < 0 && !IN_SET(errno, EPERM, EINVAL))
513 log_warning_errno(errno, "Failed to enable ctrl-alt-del handling: %m");
514
515 fd = open_terminal("/dev/tty0", O_RDWR|O_NOCTTY|O_CLOEXEC);
516 if (fd < 0) {
517 /* Support systems without virtual console */
518 if (fd != -ENOENT)
519 log_warning_errno(errno, "Failed to open /dev/tty0: %m");
520 } else {
521 /* Enable that we get SIGWINCH on kbrequest */
522 if (ioctl(fd, KDSIGACCEPT, SIGWINCH) < 0)
523 log_warning_errno(errno, "Failed to enable kbrequest handling: %m");
524 }
525
526 return 0;
527 }
528
529 #define RTSIG_IF_AVAILABLE(signum) (signum <= SIGRTMAX ? signum : -1)
530
531 static int manager_setup_signals(Manager *m) {
532 struct sigaction sa = {
533 .sa_handler = SIG_DFL,
534 .sa_flags = SA_NOCLDSTOP|SA_RESTART,
535 };
536 sigset_t mask;
537 int r;
538
539 assert(m);
540
541 assert_se(sigaction(SIGCHLD, &sa, NULL) == 0);
542
543 /* We make liberal use of realtime signals here. On
544 * Linux/glibc we have 30 of them (with the exception of Linux
545 * on hppa, see below), between SIGRTMIN+0 ... SIGRTMIN+30
546 * (aka SIGRTMAX). */
547
548 assert_se(sigemptyset(&mask) == 0);
549 sigset_add_many(&mask,
550 SIGCHLD, /* Child died */
551 SIGTERM, /* Reexecute daemon */
552 SIGHUP, /* Reload configuration */
553 SIGUSR1, /* systemd: reconnect to D-Bus */
554 SIGUSR2, /* systemd: dump status */
555 SIGINT, /* Kernel sends us this on control-alt-del */
556 SIGWINCH, /* Kernel sends us this on kbrequest (alt-arrowup) */
557 SIGPWR, /* Some kernel drivers and upsd send us this on power failure */
558
559 SIGRTMIN+0, /* systemd: start default.target */
560 SIGRTMIN+1, /* systemd: isolate rescue.target */
561 SIGRTMIN+2, /* systemd: isolate emergency.target */
562 SIGRTMIN+3, /* systemd: start halt.target */
563 SIGRTMIN+4, /* systemd: start poweroff.target */
564 SIGRTMIN+5, /* systemd: start reboot.target */
565 SIGRTMIN+6, /* systemd: start kexec.target */
566
567 /* ... space for more special targets ... */
568
569 SIGRTMIN+13, /* systemd: Immediate halt */
570 SIGRTMIN+14, /* systemd: Immediate poweroff */
571 SIGRTMIN+15, /* systemd: Immediate reboot */
572 SIGRTMIN+16, /* systemd: Immediate kexec */
573
574 /* ... space for more immediate system state changes ... */
575
576 SIGRTMIN+20, /* systemd: enable status messages */
577 SIGRTMIN+21, /* systemd: disable status messages */
578 SIGRTMIN+22, /* systemd: set log level to LOG_DEBUG */
579 SIGRTMIN+23, /* systemd: set log level to LOG_INFO */
580 SIGRTMIN+24, /* systemd: Immediate exit (--user only) */
581 SIGRTMIN+25, /* systemd: reexecute manager */
582
583 /* Apparently Linux on hppa had fewer RT signals until v3.18,
584 * SIGRTMAX was SIGRTMIN+25, and then SIGRTMIN was lowered,
585 * see commit v3.17-7614-g1f25df2eff.
586 *
587 * We cannot unconditionally make use of those signals here,
588 * so let's use a runtime check. Since these commands are
589 * accessible by different means and only really a safety
590 * net, the missing functionality on hppa shouldn't matter.
591 */
592
593 RTSIG_IF_AVAILABLE(SIGRTMIN+26), /* systemd: set log target to journal-or-kmsg */
594 RTSIG_IF_AVAILABLE(SIGRTMIN+27), /* systemd: set log target to console */
595 RTSIG_IF_AVAILABLE(SIGRTMIN+28), /* systemd: set log target to kmsg */
596 RTSIG_IF_AVAILABLE(SIGRTMIN+29), /* systemd: set log target to syslog-or-kmsg (obsolete) */
597
598 /* ... one free signal here SIGRTMIN+30 ... */
599 -1);
600 assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
601
602 m->signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
603 if (m->signal_fd < 0)
604 return -errno;
605
606 r = sd_event_add_io(m->event, &m->signal_event_source, m->signal_fd, EPOLLIN, manager_dispatch_signal_fd, m);
607 if (r < 0)
608 return r;
609
610 (void) sd_event_source_set_description(m->signal_event_source, "manager-signal");
611
612 /* Process signals a bit earlier than the rest of things, but later than notify_fd processing, so that the
613 * notify processing can still figure out to which process/service a message belongs, before we reap the
614 * process. Also, process this before handling cgroup notifications, so that we always collect child exit
615 * status information before detecting that there's no process in a cgroup. */
616 r = sd_event_source_set_priority(m->signal_event_source, SD_EVENT_PRIORITY_NORMAL-6);
617 if (r < 0)
618 return r;
619
620 if (MANAGER_IS_SYSTEM(m))
621 return enable_special_signals(m);
622
623 return 0;
624 }
625
626 static char** sanitize_environment(char **l) {
627
628 /* Let's remove some environment variables that we need ourselves to communicate with our clients */
629 strv_env_unset_many(
630 l,
631 "CACHE_DIRECTORY",
632 "CONFIGURATION_DIRECTORY",
633 "CREDENTIALS_DIRECTORY",
634 "EXIT_CODE",
635 "EXIT_STATUS",
636 "INVOCATION_ID",
637 "JOURNAL_STREAM",
638 "LISTEN_FDNAMES",
639 "LISTEN_FDS",
640 "LISTEN_PID",
641 "LOGS_DIRECTORY",
642 "MAINPID",
643 "MANAGERPID",
644 "NOTIFY_SOCKET",
645 "PIDFILE",
646 "REMOTE_ADDR",
647 "REMOTE_PORT",
648 "RUNTIME_DIRECTORY",
649 "SERVICE_RESULT",
650 "STATE_DIRECTORY",
651 "WATCHDOG_PID",
652 "WATCHDOG_USEC",
653 NULL);
654
655 /* Let's order the environment alphabetically, just to make it pretty */
656 return strv_sort(l);
657 }
658
659 int manager_default_environment(Manager *m) {
660 int r;
661
662 assert(m);
663
664 m->transient_environment = strv_free(m->transient_environment);
665
666 if (MANAGER_IS_SYSTEM(m)) {
667 /* The system manager always starts with a clean
668 * environment for its children. It does not import
669 * the kernel's or the parents' exported variables.
670 *
671 * The initial passed environment is untouched to keep
672 * /proc/self/environ valid; it is used for tagging
673 * the init process inside containers. */
674 m->transient_environment = strv_new("PATH=" DEFAULT_PATH);
675 if (!m->transient_environment)
676 return log_oom();
677
678 /* Import locale variables LC_*= from configuration */
679 (void) locale_setup(&m->transient_environment);
680 } else {
681 /* The user manager passes its own environment along to its children, except for $PATH. */
682 m->transient_environment = strv_copy(environ);
683 if (!m->transient_environment)
684 return log_oom();
685
686 r = strv_env_replace_strdup(&m->transient_environment, "PATH=" DEFAULT_USER_PATH);
687 if (r < 0)
688 return log_oom();
689 }
690
691 sanitize_environment(m->transient_environment);
692
693 return 0;
694 }
695
696 static int manager_setup_prefix(Manager *m) {
697 struct table_entry {
698 uint64_t type;
699 const char *suffix;
700 };
701
702 static const struct table_entry paths_system[_EXEC_DIRECTORY_TYPE_MAX] = {
703 [EXEC_DIRECTORY_RUNTIME] = { SD_PATH_SYSTEM_RUNTIME, NULL },
704 [EXEC_DIRECTORY_STATE] = { SD_PATH_SYSTEM_STATE_PRIVATE, NULL },
705 [EXEC_DIRECTORY_CACHE] = { SD_PATH_SYSTEM_STATE_CACHE, NULL },
706 [EXEC_DIRECTORY_LOGS] = { SD_PATH_SYSTEM_STATE_LOGS, NULL },
707 [EXEC_DIRECTORY_CONFIGURATION] = { SD_PATH_SYSTEM_CONFIGURATION, NULL },
708 };
709
710 static const struct table_entry paths_user[_EXEC_DIRECTORY_TYPE_MAX] = {
711 [EXEC_DIRECTORY_RUNTIME] = { SD_PATH_USER_RUNTIME, NULL },
712 [EXEC_DIRECTORY_STATE] = { SD_PATH_USER_CONFIGURATION, NULL },
713 [EXEC_DIRECTORY_CACHE] = { SD_PATH_USER_STATE_CACHE, NULL },
714 [EXEC_DIRECTORY_LOGS] = { SD_PATH_USER_CONFIGURATION, "log" },
715 [EXEC_DIRECTORY_CONFIGURATION] = { SD_PATH_USER_CONFIGURATION, NULL },
716 };
717
718 assert(m);
719
720 const struct table_entry *p = MANAGER_IS_SYSTEM(m) ? paths_system : paths_user;
721 int r;
722
723 for (ExecDirectoryType i = 0; i < _EXEC_DIRECTORY_TYPE_MAX; i++) {
724 r = sd_path_lookup(p[i].type, p[i].suffix, &m->prefix[i]);
725 if (r < 0)
726 return log_warning_errno(r, "Failed to lookup %s path: %m",
727 exec_directory_type_to_string(i));
728 }
729
730 return 0;
731 }
732
733 static void manager_free_unit_name_maps(Manager *m) {
734 m->unit_id_map = hashmap_free(m->unit_id_map);
735 m->unit_name_map = hashmap_free(m->unit_name_map);
736 m->unit_path_cache = set_free(m->unit_path_cache);
737 m->unit_cache_timestamp_hash = 0;
738 }
739
740 static int manager_setup_run_queue(Manager *m) {
741 int r;
742
743 assert(m);
744 assert(!m->run_queue_event_source);
745
746 r = sd_event_add_defer(m->event, &m->run_queue_event_source, manager_dispatch_run_queue, m);
747 if (r < 0)
748 return r;
749
750 r = sd_event_source_set_priority(m->run_queue_event_source, SD_EVENT_PRIORITY_IDLE);
751 if (r < 0)
752 return r;
753
754 r = sd_event_source_set_enabled(m->run_queue_event_source, SD_EVENT_OFF);
755 if (r < 0)
756 return r;
757
758 (void) sd_event_source_set_description(m->run_queue_event_source, "manager-run-queue");
759
760 return 0;
761 }
762
763 static int manager_setup_sigchld_event_source(Manager *m) {
764 int r;
765
766 assert(m);
767 assert(!m->sigchld_event_source);
768
769 r = sd_event_add_defer(m->event, &m->sigchld_event_source, manager_dispatch_sigchld, m);
770 if (r < 0)
771 return r;
772
773 r = sd_event_source_set_priority(m->sigchld_event_source, SD_EVENT_PRIORITY_NORMAL-7);
774 if (r < 0)
775 return r;
776
777 r = sd_event_source_set_enabled(m->sigchld_event_source, SD_EVENT_OFF);
778 if (r < 0)
779 return r;
780
781 (void) sd_event_source_set_description(m->sigchld_event_source, "manager-sigchld");
782
783 return 0;
784 }
785
786 int manager_new(UnitFileScope scope, ManagerTestRunFlags test_run_flags, Manager **_m) {
787 _cleanup_(manager_freep) Manager *m = NULL;
788 const char *e;
789 int r;
790
791 assert(_m);
792 assert(IN_SET(scope, UNIT_FILE_SYSTEM, UNIT_FILE_USER));
793
794 m = new(Manager, 1);
795 if (!m)
796 return -ENOMEM;
797
798 *m = (Manager) {
799 .unit_file_scope = scope,
800 .objective = _MANAGER_OBJECTIVE_INVALID,
801
802 .status_unit_format = STATUS_UNIT_FORMAT_DEFAULT,
803
804 .default_timer_accuracy_usec = USEC_PER_MINUTE,
805 .default_memory_accounting = MEMORY_ACCOUNTING_DEFAULT,
806 .default_tasks_accounting = true,
807 .default_tasks_max = TASKS_MAX_UNSET,
808 .default_timeout_start_usec = DEFAULT_TIMEOUT_USEC,
809 .default_timeout_stop_usec = DEFAULT_TIMEOUT_USEC,
810 .default_restart_usec = DEFAULT_RESTART_USEC,
811
812 .original_log_level = -1,
813 .original_log_target = _LOG_TARGET_INVALID,
814
815 .watchdog_overridden[WATCHDOG_RUNTIME] = USEC_INFINITY,
816 .watchdog_overridden[WATCHDOG_REBOOT] = USEC_INFINITY,
817 .watchdog_overridden[WATCHDOG_KEXEC] = USEC_INFINITY,
818
819 .show_status_overridden = _SHOW_STATUS_INVALID,
820
821 .notify_fd = -1,
822 .cgroups_agent_fd = -1,
823 .signal_fd = -1,
824 .time_change_fd = -1,
825 .user_lookup_fds = { -1, -1 },
826 .private_listen_fd = -1,
827 .dev_autofs_fd = -1,
828 .cgroup_inotify_fd = -1,
829 .pin_cgroupfs_fd = -1,
830 .ask_password_inotify_fd = -1,
831 .idle_pipe = { -1, -1, -1, -1},
832
833 /* start as id #1, so that we can leave #0 around as "null-like" value */
834 .current_job_id = 1,
835
836 .have_ask_password = -EINVAL, /* we don't know */
837 .first_boot = -1,
838 .test_run_flags = test_run_flags,
839
840 .default_oom_policy = OOM_STOP,
841 };
842
843 #if ENABLE_EFI
844 if (MANAGER_IS_SYSTEM(m) && detect_container() <= 0)
845 boot_timestamps(m->timestamps + MANAGER_TIMESTAMP_USERSPACE,
846 m->timestamps + MANAGER_TIMESTAMP_FIRMWARE,
847 m->timestamps + MANAGER_TIMESTAMP_LOADER);
848 #endif
849
850 /* Prepare log fields we can use for structured logging */
851 if (MANAGER_IS_SYSTEM(m)) {
852 m->unit_log_field = "UNIT=";
853 m->unit_log_format_string = "UNIT=%s";
854
855 m->invocation_log_field = "INVOCATION_ID=";
856 m->invocation_log_format_string = "INVOCATION_ID=%s";
857 } else {
858 m->unit_log_field = "USER_UNIT=";
859 m->unit_log_format_string = "USER_UNIT=%s";
860
861 m->invocation_log_field = "USER_INVOCATION_ID=";
862 m->invocation_log_format_string = "USER_INVOCATION_ID=%s";
863 }
864
865 /* Reboot immediately if the user hits C-A-D more often than 7x per 2s */
866 m->ctrl_alt_del_ratelimit = (RateLimit) { .interval = 2 * USEC_PER_SEC, .burst = 7 };
867
868 r = manager_default_environment(m);
869 if (r < 0)
870 return r;
871
872 r = hashmap_ensure_allocated(&m->units, &string_hash_ops);
873 if (r < 0)
874 return r;
875
876 r = hashmap_ensure_allocated(&m->cgroup_unit, &path_hash_ops);
877 if (r < 0)
878 return r;
879
880 r = hashmap_ensure_allocated(&m->watch_bus, &string_hash_ops);
881 if (r < 0)
882 return r;
883
884 r = prioq_ensure_allocated(&m->run_queue, compare_job_priority);
885 if (r < 0)
886 return r;
887
888 r = manager_setup_prefix(m);
889 if (r < 0)
890 return r;
891
892 r = get_credentials_dir(&e);
893 if (r >= 0) {
894 m->received_credentials = strdup(e);
895 if (!m->received_credentials)
896 return -ENOMEM;
897 }
898
899 r = sd_event_default(&m->event);
900 if (r < 0)
901 return r;
902
903 r = manager_setup_run_queue(m);
904 if (r < 0)
905 return r;
906
907 if (FLAGS_SET(test_run_flags, MANAGER_TEST_RUN_MINIMAL)) {
908 m->cgroup_root = strdup("");
909 if (!m->cgroup_root)
910 return -ENOMEM;
911 } else {
912 r = manager_setup_signals(m);
913 if (r < 0)
914 return r;
915
916 r = manager_setup_cgroup(m);
917 if (r < 0)
918 return r;
919
920 r = manager_setup_time_change(m);
921 if (r < 0)
922 return r;
923
924 r = manager_read_timezone_stat(m);
925 if (r < 0)
926 return r;
927
928 (void) manager_setup_timezone_change(m);
929
930 r = manager_setup_sigchld_event_source(m);
931 if (r < 0)
932 return r;
933
934 #if HAVE_LIBBPF
935 if (MANAGER_IS_SYSTEM(m) && lsm_bpf_supported()) {
936 r = lsm_bpf_setup(m);
937 if (r < 0)
938 return r;
939 }
940 #endif
941 }
942
943 if (test_run_flags == 0) {
944 if (MANAGER_IS_SYSTEM(m))
945 r = mkdir_label("/run/systemd/units", 0755);
946 else {
947 _cleanup_free_ char *units_path = NULL;
948 r = xdg_user_runtime_dir(&units_path, "/systemd/units");
949 if (r < 0)
950 return r;
951 r = mkdir_p_label(units_path, 0755);
952 }
953
954 if (r < 0 && r != -EEXIST)
955 return r;
956 }
957
958 m->taint_usr =
959 !in_initrd() &&
960 dir_is_empty("/usr") > 0;
961
962 /* Note that we do not set up the notify fd here. We do that after deserialization,
963 * since they might have gotten serialized across the reexec. */
964
965 *_m = TAKE_PTR(m);
966
967 return 0;
968 }
969
970 static int manager_setup_notify(Manager *m) {
971 int r;
972
973 if (MANAGER_IS_TEST_RUN(m))
974 return 0;
975
976 if (m->notify_fd < 0) {
977 _cleanup_close_ int fd = -1;
978 union sockaddr_union sa;
979 socklen_t sa_len;
980
981 /* First free all secondary fields */
982 m->notify_socket = mfree(m->notify_socket);
983 m->notify_event_source = sd_event_source_disable_unref(m->notify_event_source);
984
985 fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
986 if (fd < 0)
987 return log_error_errno(errno, "Failed to allocate notification socket: %m");
988
989 fd_inc_rcvbuf(fd, NOTIFY_RCVBUF_SIZE);
990
991 m->notify_socket = path_join(m->prefix[EXEC_DIRECTORY_RUNTIME], "systemd/notify");
992 if (!m->notify_socket)
993 return log_oom();
994
995 r = sockaddr_un_set_path(&sa.un, m->notify_socket);
996 if (r < 0)
997 return log_error_errno(r, "Notify socket '%s' not valid for AF_UNIX socket address, refusing.",
998 m->notify_socket);
999 sa_len = r;
1000
1001 (void) mkdir_parents_label(m->notify_socket, 0755);
1002 (void) sockaddr_un_unlink(&sa.un);
1003
1004 r = mac_selinux_bind(fd, &sa.sa, sa_len);
1005 if (r < 0)
1006 return log_error_errno(r, "bind(%s) failed: %m", m->notify_socket);
1007
1008 r = setsockopt_int(fd, SOL_SOCKET, SO_PASSCRED, true);
1009 if (r < 0)
1010 return log_error_errno(r, "SO_PASSCRED failed: %m");
1011
1012 m->notify_fd = TAKE_FD(fd);
1013
1014 log_debug("Using notification socket %s", m->notify_socket);
1015 }
1016
1017 if (!m->notify_event_source) {
1018 r = sd_event_add_io(m->event, &m->notify_event_source, m->notify_fd, EPOLLIN, manager_dispatch_notify_fd, m);
1019 if (r < 0)
1020 return log_error_errno(r, "Failed to allocate notify event source: %m");
1021
1022 /* Process notification messages a bit earlier than SIGCHLD, so that we can still identify to which
1023 * service an exit message belongs. */
1024 r = sd_event_source_set_priority(m->notify_event_source, SD_EVENT_PRIORITY_NORMAL-8);
1025 if (r < 0)
1026 return log_error_errno(r, "Failed to set priority of notify event source: %m");
1027
1028 (void) sd_event_source_set_description(m->notify_event_source, "manager-notify");
1029 }
1030
1031 return 0;
1032 }
1033
1034 static int manager_setup_cgroups_agent(Manager *m) {
1035
1036 static const union sockaddr_union sa = {
1037 .un.sun_family = AF_UNIX,
1038 .un.sun_path = "/run/systemd/cgroups-agent",
1039 };
1040 int r;
1041
1042 /* This creates a listening socket we receive cgroups agent messages on. We do not use D-Bus for delivering
1043 * these messages from the cgroups agent binary to PID 1, as the cgroups agent binary is very short-living, and
1044 * each instance of it needs a new D-Bus connection. Since D-Bus connections are SOCK_STREAM/AF_UNIX, on
1045 * overloaded systems the backlog of the D-Bus socket becomes relevant, as not more than the configured number
1046 * of D-Bus connections may be queued until the kernel will start dropping further incoming connections,
1047 * possibly resulting in lost cgroups agent messages. To avoid this, we'll use a private SOCK_DGRAM/AF_UNIX
1048 * socket, where no backlog is relevant as communication may take place without an actual connect() cycle, and
1049 * we thus won't lose messages.
1050 *
1051 * Note that PID 1 will forward the agent message to system bus, so that the user systemd instance may listen
1052 * to it. The system instance hence listens on this special socket, but the user instances listen on the system
1053 * bus for these messages. */
1054
1055 if (MANAGER_IS_TEST_RUN(m))
1056 return 0;
1057
1058 if (!MANAGER_IS_SYSTEM(m))
1059 return 0;
1060
1061 r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER);
1062 if (r < 0)
1063 return log_error_errno(r, "Failed to determine whether unified cgroups hierarchy is used: %m");
1064 if (r > 0) /* We don't need this anymore on the unified hierarchy */
1065 return 0;
1066
1067 if (m->cgroups_agent_fd < 0) {
1068 _cleanup_close_ int fd = -1;
1069
1070 /* First free all secondary fields */
1071 m->cgroups_agent_event_source = sd_event_source_disable_unref(m->cgroups_agent_event_source);
1072
1073 fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
1074 if (fd < 0)
1075 return log_error_errno(errno, "Failed to allocate cgroups agent socket: %m");
1076
1077 fd_inc_rcvbuf(fd, CGROUPS_AGENT_RCVBUF_SIZE);
1078
1079 (void) sockaddr_un_unlink(&sa.un);
1080
1081 /* Only allow root to connect to this socket */
1082 RUN_WITH_UMASK(0077)
1083 r = bind(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un));
1084 if (r < 0)
1085 return log_error_errno(errno, "bind(%s) failed: %m", sa.un.sun_path);
1086
1087 m->cgroups_agent_fd = TAKE_FD(fd);
1088 }
1089
1090 if (!m->cgroups_agent_event_source) {
1091 r = sd_event_add_io(m->event, &m->cgroups_agent_event_source, m->cgroups_agent_fd, EPOLLIN, manager_dispatch_cgroups_agent_fd, m);
1092 if (r < 0)
1093 return log_error_errno(r, "Failed to allocate cgroups agent event source: %m");
1094
1095 /* Process cgroups notifications early. Note that when the agent notification is received
1096 * we'll just enqueue the unit in the cgroup empty queue, hence pick a high priority than
1097 * that. Also see handling of cgroup inotify for the unified cgroup stuff. */
1098 r = sd_event_source_set_priority(m->cgroups_agent_event_source, SD_EVENT_PRIORITY_NORMAL-9);
1099 if (r < 0)
1100 return log_error_errno(r, "Failed to set priority of cgroups agent event source: %m");
1101
1102 (void) sd_event_source_set_description(m->cgroups_agent_event_source, "manager-cgroups-agent");
1103 }
1104
1105 return 0;
1106 }
1107
1108 static int manager_setup_user_lookup_fd(Manager *m) {
1109 int r;
1110
1111 assert(m);
1112
1113 /* Set up the socket pair used for passing UID/GID resolution results from forked off processes to PID
1114 * 1. Background: we can't do name lookups (NSS) from PID 1, since it might involve IPC and thus activation,
1115 * and we might hence deadlock on ourselves. Hence we do all user/group lookups asynchronously from the forked
1116 * off processes right before executing the binaries to start. In order to be able to clean up any IPC objects
1117 * created by a unit (see RemoveIPC=) we need to know in PID 1 the used UID/GID of the executed processes,
1118 * hence we establish this communication channel so that forked off processes can pass their UID/GID
1119 * information back to PID 1. The forked off processes send their resolved UID/GID to PID 1 in a simple
1120 * datagram, along with their unit name, so that we can share one communication socket pair among all units for
1121 * this purpose.
1122 *
1123 * You might wonder why we need a communication channel for this that is independent of the usual notification
1124 * socket scheme (i.e. $NOTIFY_SOCKET). The primary difference is about trust: data sent via the $NOTIFY_SOCKET
1125 * channel is only accepted if it originates from the right unit and if reception was enabled for it. The user
1126 * lookup socket OTOH is only accessible by PID 1 and its children until they exec(), and always available.
1127 *
1128 * Note that this function is called under two circumstances: when we first initialize (in which case we
1129 * allocate both the socket pair and the event source to listen on it), and when we deserialize after a reload
1130 * (in which case the socket pair already exists but we still need to allocate the event source for it). */
1131
1132 if (m->user_lookup_fds[0] < 0) {
1133
1134 /* Free all secondary fields */
1135 safe_close_pair(m->user_lookup_fds);
1136 m->user_lookup_event_source = sd_event_source_disable_unref(m->user_lookup_event_source);
1137
1138 if (socketpair(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0, m->user_lookup_fds) < 0)
1139 return log_error_errno(errno, "Failed to allocate user lookup socket: %m");
1140
1141 (void) fd_inc_rcvbuf(m->user_lookup_fds[0], NOTIFY_RCVBUF_SIZE);
1142 }
1143
1144 if (!m->user_lookup_event_source) {
1145 r = sd_event_add_io(m->event, &m->user_lookup_event_source, m->user_lookup_fds[0], EPOLLIN, manager_dispatch_user_lookup_fd, m);
1146 if (r < 0)
1147 return log_error_errno(errno, "Failed to allocate user lookup event source: %m");
1148
1149 /* Process even earlier than the notify event source, so that we always know first about valid UID/GID
1150 * resolutions */
1151 r = sd_event_source_set_priority(m->user_lookup_event_source, SD_EVENT_PRIORITY_NORMAL-11);
1152 if (r < 0)
1153 return log_error_errno(errno, "Failed to set priority of user lookup event source: %m");
1154
1155 (void) sd_event_source_set_description(m->user_lookup_event_source, "user-lookup");
1156 }
1157
1158 return 0;
1159 }
1160
1161 static unsigned manager_dispatch_cleanup_queue(Manager *m) {
1162 Unit *u;
1163 unsigned n = 0;
1164
1165 assert(m);
1166
1167 while ((u = m->cleanup_queue)) {
1168 assert(u->in_cleanup_queue);
1169
1170 unit_free(u);
1171 n++;
1172 }
1173
1174 return n;
1175 }
1176
1177 enum {
1178 GC_OFFSET_IN_PATH, /* This one is on the path we were traveling */
1179 GC_OFFSET_UNSURE, /* No clue */
1180 GC_OFFSET_GOOD, /* We still need this unit */
1181 GC_OFFSET_BAD, /* We don't need this unit anymore */
1182 _GC_OFFSET_MAX
1183 };
1184
1185 static void unit_gc_mark_good(Unit *u, unsigned gc_marker) {
1186 Unit *other;
1187
1188 u->gc_marker = gc_marker + GC_OFFSET_GOOD;
1189
1190 /* Recursively mark referenced units as GOOD as well */
1191 UNIT_FOREACH_DEPENDENCY(other, u, UNIT_ATOM_REFERENCES)
1192 if (other->gc_marker == gc_marker + GC_OFFSET_UNSURE)
1193 unit_gc_mark_good(other, gc_marker);
1194 }
1195
1196 static void unit_gc_sweep(Unit *u, unsigned gc_marker) {
1197 Unit *other;
1198 bool is_bad;
1199
1200 assert(u);
1201
1202 if (IN_SET(u->gc_marker - gc_marker,
1203 GC_OFFSET_GOOD, GC_OFFSET_BAD, GC_OFFSET_UNSURE, GC_OFFSET_IN_PATH))
1204 return;
1205
1206 if (u->in_cleanup_queue)
1207 goto bad;
1208
1209 if (!unit_may_gc(u))
1210 goto good;
1211
1212 u->gc_marker = gc_marker + GC_OFFSET_IN_PATH;
1213
1214 is_bad = true;
1215
1216 UNIT_FOREACH_DEPENDENCY(other, u, UNIT_ATOM_REFERENCED_BY) {
1217 unit_gc_sweep(other, gc_marker);
1218
1219 if (other->gc_marker == gc_marker + GC_OFFSET_GOOD)
1220 goto good;
1221
1222 if (other->gc_marker != gc_marker + GC_OFFSET_BAD)
1223 is_bad = false;
1224 }
1225
1226 const UnitRef *ref;
1227 LIST_FOREACH(refs_by_target, ref, u->refs_by_target) {
1228 unit_gc_sweep(ref->source, gc_marker);
1229
1230 if (ref->source->gc_marker == gc_marker + GC_OFFSET_GOOD)
1231 goto good;
1232
1233 if (ref->source->gc_marker != gc_marker + GC_OFFSET_BAD)
1234 is_bad = false;
1235 }
1236
1237 if (is_bad)
1238 goto bad;
1239
1240 /* We were unable to find anything out about this entry, so
1241 * let's investigate it later */
1242 u->gc_marker = gc_marker + GC_OFFSET_UNSURE;
1243 unit_add_to_gc_queue(u);
1244 return;
1245
1246 bad:
1247 /* We definitely know that this one is not useful anymore, so
1248 * let's mark it for deletion */
1249 u->gc_marker = gc_marker + GC_OFFSET_BAD;
1250 unit_add_to_cleanup_queue(u);
1251 return;
1252
1253 good:
1254 unit_gc_mark_good(u, gc_marker);
1255 }
1256
1257 static unsigned manager_dispatch_gc_unit_queue(Manager *m) {
1258 unsigned n = 0, gc_marker;
1259 Unit *u;
1260
1261 assert(m);
1262
1263 /* log_debug("Running GC..."); */
1264
1265 m->gc_marker += _GC_OFFSET_MAX;
1266 if (m->gc_marker + _GC_OFFSET_MAX <= _GC_OFFSET_MAX)
1267 m->gc_marker = 1;
1268
1269 gc_marker = m->gc_marker;
1270
1271 while ((u = m->gc_unit_queue)) {
1272 assert(u->in_gc_queue);
1273
1274 unit_gc_sweep(u, gc_marker);
1275
1276 LIST_REMOVE(gc_queue, m->gc_unit_queue, u);
1277 u->in_gc_queue = false;
1278
1279 n++;
1280
1281 if (IN_SET(u->gc_marker - gc_marker,
1282 GC_OFFSET_BAD, GC_OFFSET_UNSURE)) {
1283 if (u->id)
1284 log_unit_debug(u, "Collecting.");
1285 u->gc_marker = gc_marker + GC_OFFSET_BAD;
1286 unit_add_to_cleanup_queue(u);
1287 }
1288 }
1289
1290 return n;
1291 }
1292
1293 static unsigned manager_dispatch_gc_job_queue(Manager *m) {
1294 unsigned n = 0;
1295 Job *j;
1296
1297 assert(m);
1298
1299 while ((j = m->gc_job_queue)) {
1300 assert(j->in_gc_queue);
1301
1302 LIST_REMOVE(gc_queue, m->gc_job_queue, j);
1303 j->in_gc_queue = false;
1304
1305 n++;
1306
1307 if (!job_may_gc(j))
1308 continue;
1309
1310 log_unit_debug(j->unit, "Collecting job.");
1311 (void) job_finish_and_invalidate(j, JOB_COLLECTED, false, false);
1312 }
1313
1314 return n;
1315 }
1316
1317 static unsigned manager_dispatch_stop_when_unneeded_queue(Manager *m) {
1318 unsigned n = 0;
1319 Unit *u;
1320 int r;
1321
1322 assert(m);
1323
1324 while ((u = m->stop_when_unneeded_queue)) {
1325 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
1326
1327 assert(u->in_stop_when_unneeded_queue);
1328 LIST_REMOVE(stop_when_unneeded_queue, m->stop_when_unneeded_queue, u);
1329 u->in_stop_when_unneeded_queue = false;
1330
1331 n++;
1332
1333 if (!unit_is_unneeded(u))
1334 continue;
1335
1336 log_unit_debug(u, "Unit is not needed anymore.");
1337
1338 /* If stopping a unit fails continuously we might enter a stop loop here, hence stop acting on the
1339 * service being unnecessary after a while. */
1340
1341 if (!ratelimit_below(&u->auto_start_stop_ratelimit)) {
1342 log_unit_warning(u, "Unit not needed anymore, but not stopping since we tried this too often recently.");
1343 continue;
1344 }
1345
1346 /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
1347 r = manager_add_job(u->manager, JOB_STOP, u, JOB_FAIL, NULL, &error, NULL);
1348 if (r < 0)
1349 log_unit_warning_errno(u, r, "Failed to enqueue stop job, ignoring: %s", bus_error_message(&error, r));
1350 }
1351
1352 return n;
1353 }
1354
1355 static unsigned manager_dispatch_start_when_upheld_queue(Manager *m) {
1356 unsigned n = 0;
1357 Unit *u;
1358 int r;
1359
1360 assert(m);
1361
1362 while ((u = m->start_when_upheld_queue)) {
1363 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
1364 Unit *culprit = NULL;
1365
1366 assert(u->in_start_when_upheld_queue);
1367 LIST_REMOVE(start_when_upheld_queue, m->start_when_upheld_queue, u);
1368 u->in_start_when_upheld_queue = false;
1369
1370 n++;
1371
1372 if (!unit_is_upheld_by_active(u, &culprit))
1373 continue;
1374
1375 log_unit_debug(u, "Unit is started because upheld by active unit %s.", culprit->id);
1376
1377 /* If stopping a unit fails continuously we might enter a stop loop here, hence stop acting on the
1378 * service being unnecessary after a while. */
1379
1380 if (!ratelimit_below(&u->auto_start_stop_ratelimit)) {
1381 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);
1382 continue;
1383 }
1384
1385 r = manager_add_job(u->manager, JOB_START, u, JOB_FAIL, NULL, &error, NULL);
1386 if (r < 0)
1387 log_unit_warning_errno(u, r, "Failed to enqueue start job, ignoring: %s", bus_error_message(&error, r));
1388 }
1389
1390 return n;
1391 }
1392
1393 static unsigned manager_dispatch_stop_when_bound_queue(Manager *m) {
1394 unsigned n = 0;
1395 Unit *u;
1396 int r;
1397
1398 assert(m);
1399
1400 while ((u = m->stop_when_bound_queue)) {
1401 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
1402 Unit *culprit = NULL;
1403
1404 assert(u->in_stop_when_bound_queue);
1405 LIST_REMOVE(stop_when_bound_queue, m->stop_when_bound_queue, u);
1406 u->in_stop_when_bound_queue = false;
1407
1408 n++;
1409
1410 if (!unit_is_bound_by_inactive(u, &culprit))
1411 continue;
1412
1413 log_unit_debug(u, "Unit is stopped because bound to inactive unit %s.", culprit->id);
1414
1415 /* If stopping a unit fails continuously we might enter a stop loop here, hence stop acting on the
1416 * service being unnecessary after a while. */
1417
1418 if (!ratelimit_below(&u->auto_start_stop_ratelimit)) {
1419 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);
1420 continue;
1421 }
1422
1423 r = manager_add_job(u->manager, JOB_STOP, u, JOB_REPLACE, NULL, &error, NULL);
1424 if (r < 0)
1425 log_unit_warning_errno(u, r, "Failed to enqueue stop job, ignoring: %s", bus_error_message(&error, r));
1426 }
1427
1428 return n;
1429 }
1430
1431 static void manager_clear_jobs_and_units(Manager *m) {
1432 Unit *u;
1433
1434 assert(m);
1435
1436 while ((u = hashmap_first(m->units)))
1437 unit_free(u);
1438
1439 manager_dispatch_cleanup_queue(m);
1440
1441 assert(!m->load_queue);
1442 assert(prioq_isempty(m->run_queue));
1443 assert(!m->dbus_unit_queue);
1444 assert(!m->dbus_job_queue);
1445 assert(!m->cleanup_queue);
1446 assert(!m->gc_unit_queue);
1447 assert(!m->gc_job_queue);
1448 assert(!m->cgroup_realize_queue);
1449 assert(!m->cgroup_empty_queue);
1450 assert(!m->cgroup_oom_queue);
1451 assert(!m->target_deps_queue);
1452 assert(!m->stop_when_unneeded_queue);
1453 assert(!m->start_when_upheld_queue);
1454 assert(!m->stop_when_bound_queue);
1455
1456 assert(hashmap_isempty(m->jobs));
1457 assert(hashmap_isempty(m->units));
1458
1459 m->n_on_console = 0;
1460 m->n_running_jobs = 0;
1461 m->n_installed_jobs = 0;
1462 m->n_failed_jobs = 0;
1463 }
1464
1465 Manager* manager_free(Manager *m) {
1466 if (!m)
1467 return NULL;
1468
1469 manager_clear_jobs_and_units(m);
1470
1471 for (UnitType c = 0; c < _UNIT_TYPE_MAX; c++)
1472 if (unit_vtable[c]->shutdown)
1473 unit_vtable[c]->shutdown(m);
1474
1475 /* Keep the cgroup hierarchy in place except when we know we are going down for good */
1476 manager_shutdown_cgroup(m, IN_SET(m->objective, MANAGER_EXIT, MANAGER_REBOOT, MANAGER_POWEROFF, MANAGER_HALT, MANAGER_KEXEC));
1477
1478 lookup_paths_flush_generator(&m->lookup_paths);
1479
1480 bus_done(m);
1481 manager_varlink_done(m);
1482
1483 exec_runtime_vacuum(m);
1484 hashmap_free(m->exec_runtime_by_id);
1485
1486 dynamic_user_vacuum(m, false);
1487 hashmap_free(m->dynamic_users);
1488
1489 hashmap_free(m->units);
1490 hashmap_free(m->units_by_invocation_id);
1491 hashmap_free(m->jobs);
1492 hashmap_free(m->watch_pids);
1493 hashmap_free(m->watch_bus);
1494
1495 prioq_free(m->run_queue);
1496
1497 set_free(m->startup_units);
1498 set_free(m->failed_units);
1499
1500 sd_event_source_unref(m->signal_event_source);
1501 sd_event_source_unref(m->sigchld_event_source);
1502 sd_event_source_unref(m->notify_event_source);
1503 sd_event_source_unref(m->cgroups_agent_event_source);
1504 sd_event_source_unref(m->time_change_event_source);
1505 sd_event_source_unref(m->timezone_change_event_source);
1506 sd_event_source_unref(m->jobs_in_progress_event_source);
1507 sd_event_source_unref(m->run_queue_event_source);
1508 sd_event_source_unref(m->user_lookup_event_source);
1509
1510 safe_close(m->signal_fd);
1511 safe_close(m->notify_fd);
1512 safe_close(m->cgroups_agent_fd);
1513 safe_close(m->time_change_fd);
1514 safe_close_pair(m->user_lookup_fds);
1515
1516 manager_close_ask_password(m);
1517
1518 manager_close_idle_pipe(m);
1519
1520 sd_event_unref(m->event);
1521
1522 free(m->notify_socket);
1523
1524 lookup_paths_free(&m->lookup_paths);
1525 strv_free(m->transient_environment);
1526 strv_free(m->client_environment);
1527
1528 hashmap_free(m->cgroup_unit);
1529 manager_free_unit_name_maps(m);
1530
1531 free(m->switch_root);
1532 free(m->switch_root_init);
1533
1534 rlimit_free_all(m->rlimit);
1535
1536 assert(hashmap_isempty(m->units_requiring_mounts_for));
1537 hashmap_free(m->units_requiring_mounts_for);
1538
1539 hashmap_free(m->uid_refs);
1540 hashmap_free(m->gid_refs);
1541
1542 for (ExecDirectoryType dt = 0; dt < _EXEC_DIRECTORY_TYPE_MAX; dt++)
1543 m->prefix[dt] = mfree(m->prefix[dt]);
1544 free(m->received_credentials);
1545
1546 #if BPF_FRAMEWORK
1547 lsm_bpf_destroy(m->restrict_fs);
1548 #endif
1549
1550 return mfree(m);
1551 }
1552
1553 static void manager_enumerate_perpetual(Manager *m) {
1554 assert(m);
1555
1556 if (FLAGS_SET(m->test_run_flags, MANAGER_TEST_RUN_MINIMAL))
1557 return;
1558
1559 /* Let's ask every type to load all units from disk/kernel that it might know */
1560 for (UnitType c = 0; c < _UNIT_TYPE_MAX; c++) {
1561 if (!unit_type_supported(c)) {
1562 log_debug("Unit type .%s is not supported on this system.", unit_type_to_string(c));
1563 continue;
1564 }
1565
1566 if (unit_vtable[c]->enumerate_perpetual)
1567 unit_vtable[c]->enumerate_perpetual(m);
1568 }
1569 }
1570
1571 static void manager_enumerate(Manager *m) {
1572 assert(m);
1573
1574 if (FLAGS_SET(m->test_run_flags, MANAGER_TEST_RUN_MINIMAL))
1575 return;
1576
1577 /* Let's ask every type to load all units from disk/kernel that it might know */
1578 for (UnitType c = 0; c < _UNIT_TYPE_MAX; c++) {
1579 if (!unit_type_supported(c)) {
1580 log_debug("Unit type .%s is not supported on this system.", unit_type_to_string(c));
1581 continue;
1582 }
1583
1584 if (unit_vtable[c]->enumerate)
1585 unit_vtable[c]->enumerate(m);
1586 }
1587
1588 manager_dispatch_load_queue(m);
1589 }
1590
1591 static void manager_coldplug(Manager *m) {
1592 Unit *u;
1593 char *k;
1594 int r;
1595
1596 assert(m);
1597
1598 log_debug("Invoking unit coldplug() handlers…");
1599
1600 /* Let's place the units back into their deserialized state */
1601 HASHMAP_FOREACH_KEY(u, k, m->units) {
1602
1603 /* ignore aliases */
1604 if (u->id != k)
1605 continue;
1606
1607 r = unit_coldplug(u);
1608 if (r < 0)
1609 log_warning_errno(r, "We couldn't coldplug %s, proceeding anyway: %m", u->id);
1610 }
1611 }
1612
1613 static void manager_catchup(Manager *m) {
1614 Unit *u;
1615 char *k;
1616
1617 assert(m);
1618
1619 log_debug("Invoking unit catchup() handlers…");
1620
1621 /* Let's catch up on any state changes that happened while we were reloading/reexecing */
1622 HASHMAP_FOREACH_KEY(u, k, m->units) {
1623
1624 /* ignore aliases */
1625 if (u->id != k)
1626 continue;
1627
1628 unit_catchup(u);
1629 }
1630 }
1631
1632 static void manager_distribute_fds(Manager *m, FDSet *fds) {
1633 Unit *u;
1634
1635 assert(m);
1636
1637 HASHMAP_FOREACH(u, m->units) {
1638
1639 if (fdset_size(fds) <= 0)
1640 break;
1641
1642 if (!UNIT_VTABLE(u)->distribute_fds)
1643 continue;
1644
1645 UNIT_VTABLE(u)->distribute_fds(u, fds);
1646 }
1647 }
1648
1649 static bool manager_dbus_is_running(Manager *m, bool deserialized) {
1650 Unit *u;
1651
1652 assert(m);
1653
1654 /* This checks whether the dbus instance we are supposed to expose our APIs on is up. We check both the socket
1655 * and the service unit. If the 'deserialized' parameter is true we'll check the deserialized state of the unit
1656 * rather than the current one. */
1657
1658 if (MANAGER_IS_TEST_RUN(m))
1659 return false;
1660
1661 u = manager_get_unit(m, SPECIAL_DBUS_SOCKET);
1662 if (!u)
1663 return false;
1664 if ((deserialized ? SOCKET(u)->deserialized_state : SOCKET(u)->state) != SOCKET_RUNNING)
1665 return false;
1666
1667 u = manager_get_unit(m, SPECIAL_DBUS_SERVICE);
1668 if (!u)
1669 return false;
1670 if (!IN_SET((deserialized ? SERVICE(u)->deserialized_state : SERVICE(u)->state), SERVICE_RUNNING, SERVICE_RELOAD))
1671 return false;
1672
1673 return true;
1674 }
1675
1676 static void manager_setup_bus(Manager *m) {
1677 assert(m);
1678
1679 /* Let's set up our private bus connection now, unconditionally */
1680 (void) bus_init_private(m);
1681
1682 /* If we are in --user mode also connect to the system bus now */
1683 if (MANAGER_IS_USER(m))
1684 (void) bus_init_system(m);
1685
1686 /* Let's connect to the bus now, but only if the unit is supposed to be up */
1687 if (manager_dbus_is_running(m, MANAGER_IS_RELOADING(m))) {
1688 (void) bus_init_api(m);
1689
1690 if (MANAGER_IS_SYSTEM(m))
1691 (void) bus_init_system(m);
1692 }
1693 }
1694
1695 static void manager_preset_all(Manager *m) {
1696 int r;
1697
1698 assert(m);
1699
1700 if (m->first_boot <= 0)
1701 return;
1702
1703 if (!MANAGER_IS_SYSTEM(m))
1704 return;
1705
1706 if (MANAGER_IS_TEST_RUN(m))
1707 return;
1708
1709 /* If this is the first boot, and we are in the host system, then preset everything */
1710 r = unit_file_preset_all(UNIT_FILE_SYSTEM, 0, NULL, UNIT_FILE_PRESET_ENABLE_ONLY, NULL, 0);
1711 if (r < 0)
1712 log_full_errno(r == -EEXIST ? LOG_NOTICE : LOG_WARNING, r,
1713 "Failed to populate /etc with preset unit settings, ignoring: %m");
1714 else
1715 log_info("Populated /etc with preset unit settings.");
1716 }
1717
1718 static void manager_ready(Manager *m) {
1719 assert(m);
1720
1721 /* After having loaded everything, do the final round of catching up with what might have changed */
1722
1723 m->objective = MANAGER_OK; /* Tell everyone we are up now */
1724
1725 /* It might be safe to log to the journal now and connect to dbus */
1726 manager_recheck_journal(m);
1727 manager_recheck_dbus(m);
1728
1729 /* Let's finally catch up with any changes that took place while we were reloading/reexecing */
1730 manager_catchup(m);
1731
1732 m->honor_device_enumeration = true;
1733 }
1734
1735 Manager* manager_reloading_start(Manager *m) {
1736 m->n_reloading++;
1737 return m;
1738 }
1739 void manager_reloading_stopp(Manager **m) {
1740 if (*m) {
1741 assert((*m)->n_reloading > 0);
1742 (*m)->n_reloading--;
1743 }
1744 }
1745
1746 int manager_startup(Manager *m, FILE *serialization, FDSet *fds, const char *root) {
1747 int r;
1748
1749 assert(m);
1750
1751 /* If we are running in test mode, we still want to run the generators,
1752 * but we should not touch the real generator directories. */
1753 r = lookup_paths_init(&m->lookup_paths, m->unit_file_scope,
1754 MANAGER_IS_TEST_RUN(m) ? LOOKUP_PATHS_TEMPORARY_GENERATED : 0,
1755 root);
1756 if (r < 0)
1757 return log_error_errno(r, "Failed to initialize path lookup table: %m");
1758
1759 dual_timestamp_get(m->timestamps + manager_timestamp_initrd_mangle(MANAGER_TIMESTAMP_GENERATORS_START));
1760 r = manager_run_environment_generators(m);
1761 if (r >= 0)
1762 r = manager_run_generators(m);
1763 dual_timestamp_get(m->timestamps + manager_timestamp_initrd_mangle(MANAGER_TIMESTAMP_GENERATORS_FINISH));
1764 if (r < 0)
1765 return r;
1766
1767 manager_preset_all(m);
1768
1769 lookup_paths_log(&m->lookup_paths);
1770
1771 {
1772 /* This block is (optionally) done with the reloading counter bumped */
1773 _unused_ _cleanup_(manager_reloading_stopp) Manager *reloading = NULL;
1774
1775 /* If we will deserialize make sure that during enumeration this is already known, so we increase the
1776 * counter here already */
1777 if (serialization)
1778 reloading = manager_reloading_start(m);
1779
1780 /* First, enumerate what we can from all config files */
1781 dual_timestamp_get(m->timestamps + manager_timestamp_initrd_mangle(MANAGER_TIMESTAMP_UNITS_LOAD_START));
1782 manager_enumerate_perpetual(m);
1783 manager_enumerate(m);
1784 dual_timestamp_get(m->timestamps + manager_timestamp_initrd_mangle(MANAGER_TIMESTAMP_UNITS_LOAD_FINISH));
1785
1786 /* Second, deserialize if there is something to deserialize */
1787 if (serialization) {
1788 r = manager_deserialize(m, serialization, fds);
1789 if (r < 0)
1790 return log_error_errno(r, "Deserialization failed: %m");
1791 }
1792
1793 /* Any fds left? Find some unit which wants them. This is useful to allow container managers to pass
1794 * some file descriptors to us pre-initialized. This enables socket-based activation of entire
1795 * containers. */
1796 manager_distribute_fds(m, fds);
1797
1798 /* We might have deserialized the notify fd, but if we didn't then let's create the bus now */
1799 r = manager_setup_notify(m);
1800 if (r < 0)
1801 /* No sense to continue without notifications, our children would fail anyway. */
1802 return r;
1803
1804 r = manager_setup_cgroups_agent(m);
1805 if (r < 0)
1806 /* Likewise, no sense to continue without empty cgroup notifications. */
1807 return r;
1808
1809 r = manager_setup_user_lookup_fd(m);
1810 if (r < 0)
1811 /* This shouldn't fail, except if things are really broken. */
1812 return r;
1813
1814 /* Connect to the bus if we are good for it */
1815 manager_setup_bus(m);
1816
1817 /* Now that we are connected to all possible buses, let's deserialize who is tracking us. */
1818 r = bus_track_coldplug(m, &m->subscribed, false, m->deserialized_subscribed);
1819 if (r < 0)
1820 log_warning_errno(r, "Failed to deserialized tracked clients, ignoring: %m");
1821 m->deserialized_subscribed = strv_free(m->deserialized_subscribed);
1822
1823 r = manager_varlink_init(m);
1824 if (r < 0)
1825 log_warning_errno(r, "Failed to set up Varlink, ignoring: %m");
1826
1827 /* Third, fire things up! */
1828 manager_coldplug(m);
1829
1830 /* Clean up runtime objects */
1831 manager_vacuum(m);
1832
1833 if (serialization)
1834 /* Let's wait for the UnitNew/JobNew messages being sent, before we notify that the
1835 * reload is finished */
1836 m->send_reloading_done = true;
1837 }
1838
1839 manager_ready(m);
1840
1841 return 0;
1842 }
1843
1844 int manager_add_job(
1845 Manager *m,
1846 JobType type,
1847 Unit *unit,
1848 JobMode mode,
1849 Set *affected_jobs,
1850 sd_bus_error *error,
1851 Job **ret) {
1852
1853 Transaction *tr;
1854 int r;
1855
1856 assert(m);
1857 assert(type < _JOB_TYPE_MAX);
1858 assert(unit);
1859 assert(mode < _JOB_MODE_MAX);
1860
1861 if (mode == JOB_ISOLATE && type != JOB_START)
1862 return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "Isolate is only valid for start.");
1863
1864 if (mode == JOB_ISOLATE && !unit->allow_isolate)
1865 return sd_bus_error_set(error, BUS_ERROR_NO_ISOLATION, "Operation refused, unit may not be isolated.");
1866
1867 if (mode == JOB_TRIGGERING && type != JOB_STOP)
1868 return sd_bus_error_set(error, SD_BUS_ERROR_INVALID_ARGS, "--job-mode=triggering is only valid for stop.");
1869
1870 log_unit_debug(unit, "Trying to enqueue job %s/%s/%s", unit->id, job_type_to_string(type), job_mode_to_string(mode));
1871
1872 type = job_type_collapse(type, unit);
1873
1874 tr = transaction_new(mode == JOB_REPLACE_IRREVERSIBLY);
1875 if (!tr)
1876 return -ENOMEM;
1877
1878 r = transaction_add_job_and_dependencies(tr, type, unit, NULL, true, false,
1879 IN_SET(mode, JOB_IGNORE_DEPENDENCIES, JOB_IGNORE_REQUIREMENTS),
1880 mode == JOB_IGNORE_DEPENDENCIES, error);
1881 if (r < 0)
1882 goto tr_abort;
1883
1884 if (mode == JOB_ISOLATE) {
1885 r = transaction_add_isolate_jobs(tr, m);
1886 if (r < 0)
1887 goto tr_abort;
1888 }
1889
1890 if (mode == JOB_TRIGGERING) {
1891 r = transaction_add_triggering_jobs(tr, unit);
1892 if (r < 0)
1893 goto tr_abort;
1894 }
1895
1896 r = transaction_activate(tr, m, mode, affected_jobs, error);
1897 if (r < 0)
1898 goto tr_abort;
1899
1900 log_unit_debug(unit,
1901 "Enqueued job %s/%s as %u", unit->id,
1902 job_type_to_string(type), (unsigned) tr->anchor_job->id);
1903
1904 if (ret)
1905 *ret = tr->anchor_job;
1906
1907 transaction_free(tr);
1908 return 0;
1909
1910 tr_abort:
1911 transaction_abort(tr);
1912 transaction_free(tr);
1913 return r;
1914 }
1915
1916 int manager_add_job_by_name(Manager *m, JobType type, const char *name, JobMode mode, Set *affected_jobs, sd_bus_error *e, Job **ret) {
1917 Unit *unit = NULL; /* just to appease gcc, initialization is not really necessary */
1918 int r;
1919
1920 assert(m);
1921 assert(type < _JOB_TYPE_MAX);
1922 assert(name);
1923 assert(mode < _JOB_MODE_MAX);
1924
1925 r = manager_load_unit(m, name, NULL, NULL, &unit);
1926 if (r < 0)
1927 return r;
1928 assert(unit);
1929
1930 return manager_add_job(m, type, unit, mode, affected_jobs, e, ret);
1931 }
1932
1933 int manager_add_job_by_name_and_warn(Manager *m, JobType type, const char *name, JobMode mode, Set *affected_jobs, Job **ret) {
1934 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
1935 int r;
1936
1937 assert(m);
1938 assert(type < _JOB_TYPE_MAX);
1939 assert(name);
1940 assert(mode < _JOB_MODE_MAX);
1941
1942 r = manager_add_job_by_name(m, type, name, mode, affected_jobs, &error, ret);
1943 if (r < 0)
1944 return log_warning_errno(r, "Failed to enqueue %s job for %s: %s", job_mode_to_string(mode), name, bus_error_message(&error, r));
1945
1946 return r;
1947 }
1948
1949 int manager_propagate_reload(Manager *m, Unit *unit, JobMode mode, sd_bus_error *e) {
1950 int r;
1951 Transaction *tr;
1952
1953 assert(m);
1954 assert(unit);
1955 assert(mode < _JOB_MODE_MAX);
1956 assert(mode != JOB_ISOLATE); /* Isolate is only valid for start */
1957
1958 tr = transaction_new(mode == JOB_REPLACE_IRREVERSIBLY);
1959 if (!tr)
1960 return -ENOMEM;
1961
1962 /* We need an anchor job */
1963 r = transaction_add_job_and_dependencies(tr, JOB_NOP, unit, NULL, false, false, true, true, e);
1964 if (r < 0)
1965 goto tr_abort;
1966
1967 /* Failure in adding individual dependencies is ignored, so this always succeeds. */
1968 transaction_add_propagate_reload_jobs(tr, unit, tr->anchor_job, mode == JOB_IGNORE_DEPENDENCIES, e);
1969
1970 r = transaction_activate(tr, m, mode, NULL, e);
1971 if (r < 0)
1972 goto tr_abort;
1973
1974 transaction_free(tr);
1975 return 0;
1976
1977 tr_abort:
1978 transaction_abort(tr);
1979 transaction_free(tr);
1980 return r;
1981 }
1982
1983 Job *manager_get_job(Manager *m, uint32_t id) {
1984 assert(m);
1985
1986 return hashmap_get(m->jobs, UINT32_TO_PTR(id));
1987 }
1988
1989 Unit *manager_get_unit(Manager *m, const char *name) {
1990 assert(m);
1991 assert(name);
1992
1993 return hashmap_get(m->units, name);
1994 }
1995
1996 static int manager_dispatch_target_deps_queue(Manager *m) {
1997 Unit *u;
1998 int r = 0;
1999
2000 assert(m);
2001
2002 while ((u = m->target_deps_queue)) {
2003 _cleanup_free_ Unit **targets = NULL;
2004 int n_targets;
2005
2006 assert(u->in_target_deps_queue);
2007
2008 LIST_REMOVE(target_deps_queue, u->manager->target_deps_queue, u);
2009 u->in_target_deps_queue = false;
2010
2011 /* Take an "atomic" snapshot of dependencies here, as the call below will likely modify the
2012 * dependencies, and we can't have it that hash tables we iterate through are modified while
2013 * we are iterating through them. */
2014 n_targets = unit_get_dependency_array(u, UNIT_ATOM_DEFAULT_TARGET_DEPENDENCIES, &targets);
2015 if (n_targets < 0)
2016 return n_targets;
2017
2018 for (int i = 0; i < n_targets; i++) {
2019 r = unit_add_default_target_dependency(u, targets[i]);
2020 if (r < 0)
2021 return r;
2022 }
2023 }
2024
2025 return r;
2026 }
2027
2028 unsigned manager_dispatch_load_queue(Manager *m) {
2029 Unit *u;
2030 unsigned n = 0;
2031
2032 assert(m);
2033
2034 /* Make sure we are not run recursively */
2035 if (m->dispatching_load_queue)
2036 return 0;
2037
2038 m->dispatching_load_queue = true;
2039
2040 /* Dispatches the load queue. Takes a unit from the queue and
2041 * tries to load its data until the queue is empty */
2042
2043 while ((u = m->load_queue)) {
2044 assert(u->in_load_queue);
2045
2046 unit_load(u);
2047 n++;
2048 }
2049
2050 m->dispatching_load_queue = false;
2051
2052 /* Dispatch the units waiting for their target dependencies to be added now, as all targets that we know about
2053 * should be loaded and have aliases resolved */
2054 (void) manager_dispatch_target_deps_queue(m);
2055
2056 return n;
2057 }
2058
2059 bool manager_unit_cache_should_retry_load(Unit *u) {
2060 assert(u);
2061
2062 /* Automatic reloading from disk only applies to units which were not found sometime in the past, and
2063 * the not-found stub is kept pinned in the unit graph by dependencies. For units that were
2064 * previously loaded, we don't do automatic reloading, and daemon-reload is necessary to update. */
2065 if (u->load_state != UNIT_NOT_FOUND)
2066 return false;
2067
2068 /* The cache has been updated since the last time we tried to load the unit. There might be new
2069 * fragment paths to read. */
2070 if (u->manager->unit_cache_timestamp_hash != u->fragment_not_found_timestamp_hash)
2071 return true;
2072
2073 /* The cache needs to be updated because there are modifications on disk. */
2074 return !lookup_paths_timestamp_hash_same(&u->manager->lookup_paths, u->manager->unit_cache_timestamp_hash, NULL);
2075 }
2076
2077 int manager_load_unit_prepare(
2078 Manager *m,
2079 const char *name,
2080 const char *path,
2081 sd_bus_error *e,
2082 Unit **_ret) {
2083
2084 _cleanup_(unit_freep) Unit *cleanup_ret = NULL;
2085 Unit *ret;
2086 UnitType t;
2087 int r;
2088
2089 assert(m);
2090 assert(_ret);
2091
2092 /* This will prepare the unit for loading, but not actually load anything from disk. */
2093
2094 if (path && !path_is_absolute(path))
2095 return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Path %s is not absolute.", path);
2096
2097 if (!name) {
2098 /* 'name' and 'path' must not both be null. Check here 'path' using assert_se() to
2099 * workaround a bug in gcc that generates a -Wnonnull warning when calling basename(),
2100 * but this cannot be possible in any code path (See #6119). */
2101 assert_se(path);
2102 name = basename(path);
2103 }
2104
2105 t = unit_name_to_type(name);
2106
2107 if (t == _UNIT_TYPE_INVALID || !unit_name_is_valid(name, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) {
2108 if (unit_name_is_valid(name, UNIT_NAME_TEMPLATE))
2109 return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Unit name %s is missing the instance name.", name);
2110
2111 return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS, "Unit name %s is not valid.", name);
2112 }
2113
2114 ret = manager_get_unit(m, name);
2115 if (ret) {
2116 /* The time-based cache allows to start new units without daemon-reload,
2117 * but if they are already referenced (because of dependencies or ordering)
2118 * then we have to force a load of the fragment. As an optimization, check
2119 * first if anything in the usual paths was modified since the last time
2120 * the cache was loaded. Also check if the last time an attempt to load the
2121 * unit was made was before the most recent cache refresh, so that we know
2122 * we need to try again — even if the cache is current, it might have been
2123 * updated in a different context before we had a chance to retry loading
2124 * this particular unit. */
2125 if (manager_unit_cache_should_retry_load(ret))
2126 ret->load_state = UNIT_STUB;
2127 else {
2128 *_ret = ret;
2129 return 1;
2130 }
2131 } else {
2132 ret = cleanup_ret = unit_new(m, unit_vtable[t]->object_size);
2133 if (!ret)
2134 return -ENOMEM;
2135 }
2136
2137 if (path) {
2138 r = free_and_strdup(&ret->fragment_path, path);
2139 if (r < 0)
2140 return r;
2141 }
2142
2143 r = unit_add_name(ret, name);
2144 if (r < 0)
2145 return r;
2146
2147 unit_add_to_load_queue(ret);
2148 unit_add_to_dbus_queue(ret);
2149 unit_add_to_gc_queue(ret);
2150
2151 *_ret = ret;
2152 cleanup_ret = NULL;
2153
2154 return 0;
2155 }
2156
2157 int manager_load_unit(
2158 Manager *m,
2159 const char *name,
2160 const char *path,
2161 sd_bus_error *e,
2162 Unit **_ret) {
2163
2164 int r;
2165
2166 assert(m);
2167 assert(_ret);
2168
2169 /* This will load the service information files, but not actually
2170 * start any services or anything. */
2171
2172 r = manager_load_unit_prepare(m, name, path, e, _ret);
2173 if (r != 0)
2174 return r;
2175
2176 manager_dispatch_load_queue(m);
2177
2178 *_ret = unit_follow_merge(*_ret);
2179 return 0;
2180 }
2181
2182 int manager_load_startable_unit_or_warn(
2183 Manager *m,
2184 const char *name,
2185 const char *path,
2186 Unit **ret) {
2187
2188 /* Load a unit, make sure it loaded fully and is not masked. */
2189
2190 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
2191 Unit *unit;
2192 int r;
2193
2194 r = manager_load_unit(m, name, path, &error, &unit);
2195 if (r < 0)
2196 return log_error_errno(r, "Failed to load %s %s: %s",
2197 name ? "unit" : "unit file", name ?: path,
2198 bus_error_message(&error, r));
2199
2200 r = bus_unit_validate_load_state(unit, &error);
2201 if (r < 0)
2202 return log_error_errno(r, "%s", bus_error_message(&error, r));
2203
2204 *ret = unit;
2205 return 0;
2206 }
2207
2208 void manager_clear_jobs(Manager *m) {
2209 Job *j;
2210
2211 assert(m);
2212
2213 while ((j = hashmap_first(m->jobs)))
2214 /* No need to recurse. We're cancelling all jobs. */
2215 job_finish_and_invalidate(j, JOB_CANCELED, false, false);
2216 }
2217
2218 void manager_unwatch_pid(Manager *m, pid_t pid) {
2219 assert(m);
2220
2221 /* First let's drop the unit keyed as "pid". */
2222 (void) hashmap_remove(m->watch_pids, PID_TO_PTR(pid));
2223
2224 /* Then, let's also drop the array keyed by -pid. */
2225 free(hashmap_remove(m->watch_pids, PID_TO_PTR(-pid)));
2226 }
2227
2228 static int manager_dispatch_run_queue(sd_event_source *source, void *userdata) {
2229 Manager *m = userdata;
2230 Job *j;
2231
2232 assert(source);
2233 assert(m);
2234
2235 while ((j = prioq_peek(m->run_queue))) {
2236 assert(j->installed);
2237 assert(j->in_run_queue);
2238
2239 (void) job_run_and_invalidate(j);
2240 }
2241
2242 if (m->n_running_jobs > 0)
2243 manager_watch_jobs_in_progress(m);
2244
2245 if (m->n_on_console > 0)
2246 manager_watch_idle_pipe(m);
2247
2248 return 1;
2249 }
2250
2251 static unsigned manager_dispatch_dbus_queue(Manager *m) {
2252 unsigned n = 0, budget;
2253 Unit *u;
2254 Job *j;
2255
2256 assert(m);
2257
2258 /* When we are reloading, let's not wait with generating signals, since we need to exit the manager as quickly
2259 * as we can. There's no point in throttling generation of signals in that case. */
2260 if (MANAGER_IS_RELOADING(m) || m->send_reloading_done || m->pending_reload_message)
2261 budget = UINT_MAX; /* infinite budget in this case */
2262 else {
2263 /* Anything to do at all? */
2264 if (!m->dbus_unit_queue && !m->dbus_job_queue)
2265 return 0;
2266
2267 /* Do we have overly many messages queued at the moment? If so, let's not enqueue more on top, let's
2268 * sit this cycle out, and process things in a later cycle when the queues got a bit emptier. */
2269 if (manager_bus_n_queued_write(m) > MANAGER_BUS_BUSY_THRESHOLD)
2270 return 0;
2271
2272 /* Only process a certain number of units/jobs per event loop iteration. Even if the bus queue wasn't
2273 * overly full before this call we shouldn't increase it in size too wildly in one step, and we
2274 * shouldn't monopolize CPU time with generating these messages. Note the difference in counting of
2275 * this "budget" and the "threshold" above: the "budget" is decreased only once per generated message,
2276 * regardless how many buses/direct connections it is enqueued on, while the "threshold" is applied to
2277 * each queued instance of bus message, i.e. if the same message is enqueued to five buses/direct
2278 * connections it will be counted five times. This difference in counting ("references"
2279 * vs. "instances") is primarily a result of the fact that it's easier to implement it this way,
2280 * however it also reflects the thinking that the "threshold" should put a limit on used queue memory,
2281 * i.e. space, while the "budget" should put a limit on time. Also note that the "threshold" is
2282 * currently chosen much higher than the "budget". */
2283 budget = MANAGER_BUS_MESSAGE_BUDGET;
2284 }
2285
2286 while (budget != 0 && (u = m->dbus_unit_queue)) {
2287
2288 assert(u->in_dbus_queue);
2289
2290 bus_unit_send_change_signal(u);
2291 n++;
2292
2293 if (budget != UINT_MAX)
2294 budget--;
2295 }
2296
2297 while (budget != 0 && (j = m->dbus_job_queue)) {
2298 assert(j->in_dbus_queue);
2299
2300 bus_job_send_change_signal(j);
2301 n++;
2302
2303 if (budget != UINT_MAX)
2304 budget--;
2305 }
2306
2307 if (m->send_reloading_done) {
2308 m->send_reloading_done = false;
2309 bus_manager_send_reloading(m, false);
2310 n++;
2311 }
2312
2313 if (m->pending_reload_message) {
2314 bus_send_pending_reload_message(m);
2315 n++;
2316 }
2317
2318 return n;
2319 }
2320
2321 static int manager_dispatch_cgroups_agent_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2322 Manager *m = userdata;
2323 char buf[PATH_MAX];
2324 ssize_t n;
2325
2326 n = recv(fd, buf, sizeof(buf), 0);
2327 if (n < 0)
2328 return log_error_errno(errno, "Failed to read cgroups agent message: %m");
2329 if (n == 0) {
2330 log_error("Got zero-length cgroups agent message, ignoring.");
2331 return 0;
2332 }
2333 if ((size_t) n >= sizeof(buf)) {
2334 log_error("Got overly long cgroups agent message, ignoring.");
2335 return 0;
2336 }
2337
2338 if (memchr(buf, 0, n)) {
2339 log_error("Got cgroups agent message with embedded NUL byte, ignoring.");
2340 return 0;
2341 }
2342 buf[n] = 0;
2343
2344 manager_notify_cgroup_empty(m, buf);
2345 (void) bus_forward_agent_released(m, buf);
2346
2347 return 0;
2348 }
2349
2350 static bool manager_process_barrier_fd(char * const *tags, FDSet *fds) {
2351
2352 /* nothing else must be sent when using BARRIER=1 */
2353 if (strv_contains(tags, "BARRIER=1")) {
2354 if (strv_length(tags) == 1) {
2355 if (fdset_size(fds) != 1)
2356 log_warning("Got incorrect number of fds with BARRIER=1, closing them.");
2357 } else
2358 log_warning("Extra notification messages sent with BARRIER=1, ignoring everything.");
2359
2360 /* Drop the message if BARRIER=1 was found */
2361 return true;
2362 }
2363
2364 return false;
2365 }
2366
2367 static void manager_invoke_notify_message(
2368 Manager *m,
2369 Unit *u,
2370 const struct ucred *ucred,
2371 char * const *tags,
2372 FDSet *fds) {
2373
2374 assert(m);
2375 assert(u);
2376 assert(ucred);
2377 assert(tags);
2378
2379 if (u->notifygen == m->notifygen) /* Already invoked on this same unit in this same iteration? */
2380 return;
2381 u->notifygen = m->notifygen;
2382
2383 if (UNIT_VTABLE(u)->notify_message)
2384 UNIT_VTABLE(u)->notify_message(u, ucred, tags, fds);
2385
2386 else if (DEBUG_LOGGING) {
2387 _cleanup_free_ char *buf = NULL, *x = NULL, *y = NULL;
2388
2389 buf = strv_join(tags, ", ");
2390 if (buf)
2391 x = ellipsize(buf, 20, 90);
2392 if (x)
2393 y = cescape(x);
2394
2395 log_unit_debug(u, "Got notification message \"%s\", ignoring.", strnull(y));
2396 }
2397 }
2398
2399 static int manager_dispatch_notify_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2400
2401 _cleanup_fdset_free_ FDSet *fds = NULL;
2402 Manager *m = userdata;
2403 char buf[NOTIFY_BUFFER_MAX+1];
2404 struct iovec iovec = {
2405 .iov_base = buf,
2406 .iov_len = sizeof(buf)-1,
2407 };
2408 CMSG_BUFFER_TYPE(CMSG_SPACE(sizeof(struct ucred)) +
2409 CMSG_SPACE(sizeof(int) * NOTIFY_FD_MAX)) control;
2410 struct msghdr msghdr = {
2411 .msg_iov = &iovec,
2412 .msg_iovlen = 1,
2413 .msg_control = &control,
2414 .msg_controllen = sizeof(control),
2415 };
2416
2417 struct cmsghdr *cmsg;
2418 struct ucred *ucred = NULL;
2419 _cleanup_free_ Unit **array_copy = NULL;
2420 _cleanup_strv_free_ char **tags = NULL;
2421 Unit *u1, *u2, **array;
2422 int r, *fd_array = NULL;
2423 size_t n_fds = 0;
2424 bool found = false;
2425 ssize_t n;
2426
2427 assert(m);
2428 assert(m->notify_fd == fd);
2429
2430 if (revents != EPOLLIN) {
2431 log_warning("Got unexpected poll event for notify fd.");
2432 return 0;
2433 }
2434
2435 n = recvmsg_safe(m->notify_fd, &msghdr, MSG_DONTWAIT|MSG_CMSG_CLOEXEC|MSG_TRUNC);
2436 if (IN_SET(n, -EAGAIN, -EINTR))
2437 return 0; /* Spurious wakeup, try again */
2438 if (n == -EXFULL) {
2439 log_warning("Got message with truncated control data (too many fds sent?), ignoring.");
2440 return 0;
2441 }
2442 if (n < 0)
2443 /* If this is any other, real error, then let's stop processing this socket. This of course
2444 * means we won't take notification messages anymore, but that's still better than busy
2445 * looping around this: being woken up over and over again but being unable to actually read
2446 * the message off the socket. */
2447 return log_error_errno(n, "Failed to receive notification message: %m");
2448
2449 CMSG_FOREACH(cmsg, &msghdr) {
2450 if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_RIGHTS) {
2451
2452 assert(!fd_array);
2453 fd_array = (int*) CMSG_DATA(cmsg);
2454 n_fds = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int);
2455
2456 } else if (cmsg->cmsg_level == SOL_SOCKET &&
2457 cmsg->cmsg_type == SCM_CREDENTIALS &&
2458 cmsg->cmsg_len == CMSG_LEN(sizeof(struct ucred))) {
2459
2460 assert(!ucred);
2461 ucred = (struct ucred*) CMSG_DATA(cmsg);
2462 }
2463 }
2464
2465 if (n_fds > 0) {
2466 assert(fd_array);
2467
2468 r = fdset_new_array(&fds, fd_array, n_fds);
2469 if (r < 0) {
2470 close_many(fd_array, n_fds);
2471 log_oom();
2472 return 0;
2473 }
2474 }
2475
2476 if (!ucred || !pid_is_valid(ucred->pid)) {
2477 log_warning("Received notify message without valid credentials. Ignoring.");
2478 return 0;
2479 }
2480
2481 if ((size_t) n >= sizeof(buf) || (msghdr.msg_flags & MSG_TRUNC)) {
2482 log_warning("Received notify message exceeded maximum size. Ignoring.");
2483 return 0;
2484 }
2485
2486 /* As extra safety check, let's make sure the string we get doesn't contain embedded NUL bytes. We permit one
2487 * trailing NUL byte in the message, but don't expect it. */
2488 if (n > 1 && memchr(buf, 0, n-1)) {
2489 log_warning("Received notify message with embedded NUL bytes. Ignoring.");
2490 return 0;
2491 }
2492
2493 /* Make sure it's NUL-terminated, then parse it to obtain the tags list */
2494 buf[n] = 0;
2495 tags = strv_split_newlines(buf);
2496 if (!tags) {
2497 log_oom();
2498 return 0;
2499 }
2500
2501 /* possibly a barrier fd, let's see */
2502 if (manager_process_barrier_fd(tags, fds))
2503 return 0;
2504
2505 /* Increase the generation counter used for filtering out duplicate unit invocations. */
2506 m->notifygen++;
2507
2508 /* Notify every unit that might be interested, which might be multiple. */
2509 u1 = manager_get_unit_by_pid_cgroup(m, ucred->pid);
2510 u2 = hashmap_get(m->watch_pids, PID_TO_PTR(ucred->pid));
2511 array = hashmap_get(m->watch_pids, PID_TO_PTR(-ucred->pid));
2512 if (array) {
2513 size_t k = 0;
2514
2515 while (array[k])
2516 k++;
2517
2518 array_copy = newdup(Unit*, array, k+1);
2519 if (!array_copy)
2520 log_oom();
2521 }
2522 /* And now invoke the per-unit callbacks. Note that manager_invoke_notify_message() will handle duplicate units
2523 * make sure we only invoke each unit's handler once. */
2524 if (u1) {
2525 manager_invoke_notify_message(m, u1, ucred, tags, fds);
2526 found = true;
2527 }
2528 if (u2) {
2529 manager_invoke_notify_message(m, u2, ucred, tags, fds);
2530 found = true;
2531 }
2532 if (array_copy)
2533 for (size_t i = 0; array_copy[i]; i++) {
2534 manager_invoke_notify_message(m, array_copy[i], ucred, tags, fds);
2535 found = true;
2536 }
2537
2538 if (!found)
2539 log_warning("Cannot find unit for notify message of PID "PID_FMT", ignoring.", ucred->pid);
2540
2541 if (fdset_size(fds) > 0)
2542 log_warning("Got extra auxiliary fds with notification message, closing them.");
2543
2544 return 0;
2545 }
2546
2547 static void manager_invoke_sigchld_event(
2548 Manager *m,
2549 Unit *u,
2550 const siginfo_t *si) {
2551
2552 assert(m);
2553 assert(u);
2554 assert(si);
2555
2556 /* Already invoked the handler of this unit in this iteration? Then don't process this again */
2557 if (u->sigchldgen == m->sigchldgen)
2558 return;
2559 u->sigchldgen = m->sigchldgen;
2560
2561 log_unit_debug(u, "Child "PID_FMT" belongs to %s.", si->si_pid, u->id);
2562 unit_unwatch_pid(u, si->si_pid);
2563
2564 if (UNIT_VTABLE(u)->sigchld_event)
2565 UNIT_VTABLE(u)->sigchld_event(u, si->si_pid, si->si_code, si->si_status);
2566 }
2567
2568 static int manager_dispatch_sigchld(sd_event_source *source, void *userdata) {
2569 Manager *m = userdata;
2570 siginfo_t si = {};
2571 int r;
2572
2573 assert(source);
2574 assert(m);
2575
2576 /* First we call waitid() for a PID and do not reap the zombie. That way we can still access /proc/$PID for it
2577 * while it is a zombie. */
2578
2579 if (waitid(P_ALL, 0, &si, WEXITED|WNOHANG|WNOWAIT) < 0) {
2580
2581 if (errno != ECHILD)
2582 log_error_errno(errno, "Failed to peek for child with waitid(), ignoring: %m");
2583
2584 goto turn_off;
2585 }
2586
2587 if (si.si_pid <= 0)
2588 goto turn_off;
2589
2590 if (IN_SET(si.si_code, CLD_EXITED, CLD_KILLED, CLD_DUMPED)) {
2591 _cleanup_free_ Unit **array_copy = NULL;
2592 _cleanup_free_ char *name = NULL;
2593 Unit *u1, *u2, **array;
2594
2595 (void) get_process_comm(si.si_pid, &name);
2596
2597 log_debug("Child "PID_FMT" (%s) died (code=%s, status=%i/%s)",
2598 si.si_pid, strna(name),
2599 sigchld_code_to_string(si.si_code),
2600 si.si_status,
2601 strna(si.si_code == CLD_EXITED
2602 ? exit_status_to_string(si.si_status, EXIT_STATUS_FULL)
2603 : signal_to_string(si.si_status)));
2604
2605 /* Increase the generation counter used for filtering out duplicate unit invocations */
2606 m->sigchldgen++;
2607
2608 /* And now figure out the unit this belongs to, it might be multiple... */
2609 u1 = manager_get_unit_by_pid_cgroup(m, si.si_pid);
2610 u2 = hashmap_get(m->watch_pids, PID_TO_PTR(si.si_pid));
2611 array = hashmap_get(m->watch_pids, PID_TO_PTR(-si.si_pid));
2612 if (array) {
2613 size_t n = 0;
2614
2615 /* Count how many entries the array has */
2616 while (array[n])
2617 n++;
2618
2619 /* Make a copy of the array so that we don't trip up on the array changing beneath us */
2620 array_copy = newdup(Unit*, array, n+1);
2621 if (!array_copy)
2622 log_oom();
2623 }
2624
2625 /* Finally, execute them all. Note that u1, u2 and the array might contain duplicates, but
2626 * that's fine, manager_invoke_sigchld_event() will ensure we only invoke the handlers once for
2627 * each iteration. */
2628 if (u1) {
2629 /* We check for oom condition, in case we got SIGCHLD before the oom notification.
2630 * We only do this for the cgroup the PID belonged to. */
2631 (void) unit_check_oom(u1);
2632
2633 /* This only logs for now. In the future when the interface for kills/notifications
2634 * is more stable we can extend service results table similar to how kernel oom kills
2635 * are managed. */
2636 (void) unit_check_oomd_kill(u1);
2637
2638 manager_invoke_sigchld_event(m, u1, &si);
2639 }
2640 if (u2)
2641 manager_invoke_sigchld_event(m, u2, &si);
2642 if (array_copy)
2643 for (size_t i = 0; array_copy[i]; i++)
2644 manager_invoke_sigchld_event(m, array_copy[i], &si);
2645 }
2646
2647 /* And now, we actually reap the zombie. */
2648 if (waitid(P_PID, si.si_pid, &si, WEXITED) < 0) {
2649 log_error_errno(errno, "Failed to dequeue child, ignoring: %m");
2650 return 0;
2651 }
2652
2653 return 0;
2654
2655 turn_off:
2656 /* All children processed for now, turn off event source */
2657
2658 r = sd_event_source_set_enabled(m->sigchld_event_source, SD_EVENT_OFF);
2659 if (r < 0)
2660 return log_error_errno(r, "Failed to disable SIGCHLD event source: %m");
2661
2662 return 0;
2663 }
2664
2665 static void manager_start_special(Manager *m, const char *name, JobMode mode) {
2666 Job *job;
2667
2668 if (manager_add_job_by_name_and_warn(m, JOB_START, name, mode, NULL, &job) < 0)
2669 return;
2670
2671 const char *s = unit_status_string(job->unit, NULL);
2672
2673 log_info("Activating special unit %s...", s);
2674
2675 sd_notifyf(false,
2676 "STATUS=Activating special unit %s...", s);
2677 m->status_ready = false;
2678 }
2679
2680 static void manager_handle_ctrl_alt_del(Manager *m) {
2681 /* If the user presses C-A-D more than
2682 * 7 times within 2s, we reboot/shutdown immediately,
2683 * unless it was disabled in system.conf */
2684
2685 if (ratelimit_below(&m->ctrl_alt_del_ratelimit) || m->cad_burst_action == EMERGENCY_ACTION_NONE)
2686 manager_start_special(m, SPECIAL_CTRL_ALT_DEL_TARGET, JOB_REPLACE_IRREVERSIBLY);
2687 else
2688 emergency_action(m, m->cad_burst_action, EMERGENCY_ACTION_WARN, NULL, -1,
2689 "Ctrl-Alt-Del was pressed more than 7 times within 2s");
2690 }
2691
2692 static int manager_dispatch_signal_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2693 Manager *m = userdata;
2694 ssize_t n;
2695 struct signalfd_siginfo sfsi;
2696 int r;
2697
2698 assert(m);
2699 assert(m->signal_fd == fd);
2700
2701 if (revents != EPOLLIN) {
2702 log_warning("Got unexpected events from signal file descriptor.");
2703 return 0;
2704 }
2705
2706 n = read(m->signal_fd, &sfsi, sizeof(sfsi));
2707 if (n != sizeof(sfsi)) {
2708 if (n >= 0) {
2709 log_warning("Truncated read from signal fd (%zu bytes), ignoring!", n);
2710 return 0;
2711 }
2712
2713 if (IN_SET(errno, EINTR, EAGAIN))
2714 return 0;
2715
2716 /* We return an error here, which will kill this handler,
2717 * to avoid a busy loop on read error. */
2718 return log_error_errno(errno, "Reading from signal fd failed: %m");
2719 }
2720
2721 log_received_signal(sfsi.ssi_signo == SIGCHLD ||
2722 (sfsi.ssi_signo == SIGTERM && MANAGER_IS_USER(m))
2723 ? LOG_DEBUG : LOG_INFO,
2724 &sfsi);
2725
2726 switch (sfsi.ssi_signo) {
2727
2728 case SIGCHLD:
2729 r = sd_event_source_set_enabled(m->sigchld_event_source, SD_EVENT_ON);
2730 if (r < 0)
2731 log_warning_errno(r, "Failed to enable SIGCHLD event source, ignoring: %m");
2732
2733 break;
2734
2735 case SIGTERM:
2736 if (MANAGER_IS_SYSTEM(m)) {
2737 /* This is for compatibility with the original sysvinit */
2738 if (verify_run_space_and_log("Refusing to reexecute") < 0)
2739 break;
2740
2741 m->objective = MANAGER_REEXECUTE;
2742 break;
2743 }
2744
2745 _fallthrough_;
2746 case SIGINT:
2747 if (MANAGER_IS_SYSTEM(m))
2748 manager_handle_ctrl_alt_del(m);
2749 else
2750 manager_start_special(m, SPECIAL_EXIT_TARGET, JOB_REPLACE_IRREVERSIBLY);
2751 break;
2752
2753 case SIGWINCH:
2754 /* This is a nop on non-init */
2755 if (MANAGER_IS_SYSTEM(m))
2756 manager_start_special(m, SPECIAL_KBREQUEST_TARGET, JOB_REPLACE);
2757
2758 break;
2759
2760 case SIGPWR:
2761 /* This is a nop on non-init */
2762 if (MANAGER_IS_SYSTEM(m))
2763 manager_start_special(m, SPECIAL_SIGPWR_TARGET, JOB_REPLACE);
2764
2765 break;
2766
2767 case SIGUSR1:
2768 if (manager_dbus_is_running(m, false)) {
2769 log_info("Trying to reconnect to bus...");
2770
2771 (void) bus_init_api(m);
2772
2773 if (MANAGER_IS_SYSTEM(m))
2774 (void) bus_init_system(m);
2775 } else
2776 manager_start_special(m, SPECIAL_DBUS_SERVICE, JOB_REPLACE);
2777
2778 break;
2779
2780 case SIGUSR2: {
2781 _cleanup_free_ char *dump = NULL;
2782
2783 r = manager_get_dump_string(m, &dump);
2784 if (r < 0) {
2785 log_warning_errno(errno, "Failed to acquire manager dump: %m");
2786 break;
2787 }
2788
2789 log_dump(LOG_INFO, dump);
2790 break;
2791 }
2792
2793 case SIGHUP:
2794 if (verify_run_space_and_log("Refusing to reload") < 0)
2795 break;
2796
2797 m->objective = MANAGER_RELOAD;
2798 break;
2799
2800 default: {
2801
2802 /* Starting SIGRTMIN+0 */
2803 static const struct {
2804 const char *target;
2805 JobMode mode;
2806 } target_table[] = {
2807 [0] = { SPECIAL_DEFAULT_TARGET, JOB_ISOLATE },
2808 [1] = { SPECIAL_RESCUE_TARGET, JOB_ISOLATE },
2809 [2] = { SPECIAL_EMERGENCY_TARGET, JOB_ISOLATE },
2810 [3] = { SPECIAL_HALT_TARGET, JOB_REPLACE_IRREVERSIBLY },
2811 [4] = { SPECIAL_POWEROFF_TARGET, JOB_REPLACE_IRREVERSIBLY },
2812 [5] = { SPECIAL_REBOOT_TARGET, JOB_REPLACE_IRREVERSIBLY },
2813 [6] = { SPECIAL_KEXEC_TARGET, JOB_REPLACE_IRREVERSIBLY },
2814 };
2815
2816 /* Starting SIGRTMIN+13, so that target halt and system halt are 10 apart */
2817 static const ManagerObjective objective_table[] = {
2818 [0] = MANAGER_HALT,
2819 [1] = MANAGER_POWEROFF,
2820 [2] = MANAGER_REBOOT,
2821 [3] = MANAGER_KEXEC,
2822 };
2823
2824 if ((int) sfsi.ssi_signo >= SIGRTMIN+0 &&
2825 (int) sfsi.ssi_signo < SIGRTMIN+(int) ELEMENTSOF(target_table)) {
2826 int idx = (int) sfsi.ssi_signo - SIGRTMIN;
2827 manager_start_special(m, target_table[idx].target, target_table[idx].mode);
2828 break;
2829 }
2830
2831 if ((int) sfsi.ssi_signo >= SIGRTMIN+13 &&
2832 (int) sfsi.ssi_signo < SIGRTMIN+13+(int) ELEMENTSOF(objective_table)) {
2833 m->objective = objective_table[sfsi.ssi_signo - SIGRTMIN - 13];
2834 break;
2835 }
2836
2837 switch (sfsi.ssi_signo - SIGRTMIN) {
2838
2839 case 20:
2840 manager_override_show_status(m, SHOW_STATUS_YES, "signal");
2841 break;
2842
2843 case 21:
2844 manager_override_show_status(m, SHOW_STATUS_NO, "signal");
2845 break;
2846
2847 case 22:
2848 manager_override_log_level(m, LOG_DEBUG);
2849 break;
2850
2851 case 23:
2852 manager_restore_original_log_level(m);
2853 break;
2854
2855 case 24:
2856 if (MANAGER_IS_USER(m)) {
2857 m->objective = MANAGER_EXIT;
2858 return 0;
2859 }
2860
2861 /* This is a nop on init */
2862 break;
2863
2864 case 25:
2865 m->objective = MANAGER_REEXECUTE;
2866 break;
2867
2868 case 26:
2869 case 29: /* compatibility: used to be mapped to LOG_TARGET_SYSLOG_OR_KMSG */
2870 manager_restore_original_log_target(m);
2871 break;
2872
2873 case 27:
2874 manager_override_log_target(m, LOG_TARGET_CONSOLE);
2875 break;
2876
2877 case 28:
2878 manager_override_log_target(m, LOG_TARGET_KMSG);
2879 break;
2880
2881 default:
2882 log_warning("Got unhandled signal <%s>.", signal_to_string(sfsi.ssi_signo));
2883 }
2884 }}
2885
2886 return 0;
2887 }
2888
2889 static int manager_dispatch_time_change_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2890 Manager *m = userdata;
2891 Unit *u;
2892
2893 assert(m);
2894 assert(m->time_change_fd == fd);
2895
2896 log_struct(LOG_DEBUG,
2897 "MESSAGE_ID=" SD_MESSAGE_TIME_CHANGE_STR,
2898 LOG_MESSAGE("Time has been changed"));
2899
2900 /* Restart the watch */
2901 (void) manager_setup_time_change(m);
2902
2903 HASHMAP_FOREACH(u, m->units)
2904 if (UNIT_VTABLE(u)->time_change)
2905 UNIT_VTABLE(u)->time_change(u);
2906
2907 return 0;
2908 }
2909
2910 static int manager_dispatch_timezone_change(
2911 sd_event_source *source,
2912 const struct inotify_event *e,
2913 void *userdata) {
2914
2915 Manager *m = userdata;
2916 int changed;
2917 Unit *u;
2918
2919 assert(m);
2920
2921 log_debug("inotify event for /etc/localtime");
2922
2923 changed = manager_read_timezone_stat(m);
2924 if (changed <= 0)
2925 return changed;
2926
2927 /* Something changed, restart the watch, to ensure we watch the new /etc/localtime if it changed */
2928 (void) manager_setup_timezone_change(m);
2929
2930 /* Read the new timezone */
2931 tzset();
2932
2933 log_debug("Timezone has been changed (now: %s).", tzname[daylight]);
2934
2935 HASHMAP_FOREACH(u, m->units)
2936 if (UNIT_VTABLE(u)->timezone_change)
2937 UNIT_VTABLE(u)->timezone_change(u);
2938
2939 return 0;
2940 }
2941
2942 static int manager_dispatch_idle_pipe_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
2943 Manager *m = userdata;
2944
2945 assert(m);
2946 assert(m->idle_pipe[2] == fd);
2947
2948 /* There's at least one Type=idle child that just gave up on us waiting for the boot process to complete. Let's
2949 * now turn off any further console output if there's at least one service that needs console access, so that
2950 * from now on our own output should not spill into that service's output anymore. After all, we support
2951 * Type=idle only to beautify console output and it generally is set on services that want to own the console
2952 * exclusively without our interference. */
2953 m->no_console_output = m->n_on_console > 0;
2954
2955 /* Acknowledge the child's request, and let all all other children know too that they shouldn't wait any longer
2956 * by closing the pipes towards them, which is what they are waiting for. */
2957 manager_close_idle_pipe(m);
2958
2959 return 0;
2960 }
2961
2962 static int manager_dispatch_jobs_in_progress(sd_event_source *source, usec_t usec, void *userdata) {
2963 Manager *m = userdata;
2964 int r;
2965
2966 assert(m);
2967 assert(source);
2968
2969 manager_print_jobs_in_progress(m);
2970
2971 r = sd_event_source_set_time_relative(source, JOBS_IN_PROGRESS_PERIOD_USEC);
2972 if (r < 0)
2973 return r;
2974
2975 return sd_event_source_set_enabled(source, SD_EVENT_ONESHOT);
2976 }
2977
2978 int manager_loop(Manager *m) {
2979 RateLimit rl = { .interval = 1*USEC_PER_SEC, .burst = 50000 };
2980 int r;
2981
2982 assert(m);
2983 assert(m->objective == MANAGER_OK); /* Ensure manager_startup() has been called */
2984
2985 manager_check_finished(m);
2986
2987 /* There might still be some zombies hanging around from before we were exec()'ed. Let's reap them. */
2988 r = sd_event_source_set_enabled(m->sigchld_event_source, SD_EVENT_ON);
2989 if (r < 0)
2990 return log_error_errno(r, "Failed to enable SIGCHLD event source: %m");
2991
2992 while (m->objective == MANAGER_OK) {
2993
2994 (void) watchdog_ping();
2995
2996 if (!ratelimit_below(&rl)) {
2997 /* Yay, something is going seriously wrong, pause a little */
2998 log_warning("Looping too fast. Throttling execution a little.");
2999 sleep(1);
3000 }
3001
3002 if (manager_dispatch_load_queue(m) > 0)
3003 continue;
3004
3005 if (manager_dispatch_gc_job_queue(m) > 0)
3006 continue;
3007
3008 if (manager_dispatch_gc_unit_queue(m) > 0)
3009 continue;
3010
3011 if (manager_dispatch_cleanup_queue(m) > 0)
3012 continue;
3013
3014 if (manager_dispatch_cgroup_realize_queue(m) > 0)
3015 continue;
3016
3017 if (manager_dispatch_start_when_upheld_queue(m) > 0)
3018 continue;
3019
3020 if (manager_dispatch_stop_when_bound_queue(m) > 0)
3021 continue;
3022
3023 if (manager_dispatch_stop_when_unneeded_queue(m) > 0)
3024 continue;
3025
3026 if (manager_dispatch_dbus_queue(m) > 0)
3027 continue;
3028
3029 /* Sleep for watchdog runtime wait time */
3030 r = sd_event_run(m->event, watchdog_runtime_wait());
3031 if (r < 0)
3032 return log_error_errno(r, "Failed to run event loop: %m");
3033 }
3034
3035 return m->objective;
3036 }
3037
3038 int manager_load_unit_from_dbus_path(Manager *m, const char *s, sd_bus_error *e, Unit **_u) {
3039 _cleanup_free_ char *n = NULL;
3040 sd_id128_t invocation_id;
3041 Unit *u;
3042 int r;
3043
3044 assert(m);
3045 assert(s);
3046 assert(_u);
3047
3048 r = unit_name_from_dbus_path(s, &n);
3049 if (r < 0)
3050 return r;
3051
3052 /* Permit addressing units by invocation ID: if the passed bus path is suffixed by a 128bit ID then we use it
3053 * as invocation ID. */
3054 r = sd_id128_from_string(n, &invocation_id);
3055 if (r >= 0) {
3056 u = hashmap_get(m->units_by_invocation_id, &invocation_id);
3057 if (u) {
3058 *_u = u;
3059 return 0;
3060 }
3061
3062 return sd_bus_error_setf(e, BUS_ERROR_NO_UNIT_FOR_INVOCATION_ID,
3063 "No unit with the specified invocation ID " SD_ID128_FORMAT_STR " known.",
3064 SD_ID128_FORMAT_VAL(invocation_id));
3065 }
3066
3067 /* If this didn't work, we check if this is a unit name */
3068 if (!unit_name_is_valid(n, UNIT_NAME_PLAIN|UNIT_NAME_INSTANCE)) {
3069 _cleanup_free_ char *nn = NULL;
3070
3071 nn = cescape(n);
3072 return sd_bus_error_setf(e, SD_BUS_ERROR_INVALID_ARGS,
3073 "Unit name %s is neither a valid invocation ID nor unit name.", strnull(nn));
3074 }
3075
3076 r = manager_load_unit(m, n, NULL, e, &u);
3077 if (r < 0)
3078 return r;
3079
3080 *_u = u;
3081 return 0;
3082 }
3083
3084 int manager_get_job_from_dbus_path(Manager *m, const char *s, Job **_j) {
3085 const char *p;
3086 unsigned id;
3087 Job *j;
3088 int r;
3089
3090 assert(m);
3091 assert(s);
3092 assert(_j);
3093
3094 p = startswith(s, "/org/freedesktop/systemd1/job/");
3095 if (!p)
3096 return -EINVAL;
3097
3098 r = safe_atou(p, &id);
3099 if (r < 0)
3100 return r;
3101
3102 j = manager_get_job(m, id);
3103 if (!j)
3104 return -ENOENT;
3105
3106 *_j = j;
3107
3108 return 0;
3109 }
3110
3111 void manager_send_unit_audit(Manager *m, Unit *u, int type, bool success) {
3112
3113 #if HAVE_AUDIT
3114 _cleanup_free_ char *p = NULL;
3115 const char *msg;
3116 int audit_fd, r;
3117
3118 if (!MANAGER_IS_SYSTEM(m))
3119 return;
3120
3121 audit_fd = get_audit_fd();
3122 if (audit_fd < 0)
3123 return;
3124
3125 /* Don't generate audit events if the service was already
3126 * started and we're just deserializing */
3127 if (MANAGER_IS_RELOADING(m))
3128 return;
3129
3130 if (u->type != UNIT_SERVICE)
3131 return;
3132
3133 r = unit_name_to_prefix_and_instance(u->id, &p);
3134 if (r < 0) {
3135 log_error_errno(r, "Failed to extract prefix and instance of unit name: %m");
3136 return;
3137 }
3138
3139 msg = strjoina("unit=", p);
3140 if (audit_log_user_comm_message(audit_fd, type, msg, "systemd", NULL, NULL, NULL, success) < 0) {
3141 if (errno == EPERM)
3142 /* We aren't allowed to send audit messages?
3143 * Then let's not retry again. */
3144 close_audit_fd();
3145 else
3146 log_warning_errno(errno, "Failed to send audit message: %m");
3147 }
3148 #endif
3149
3150 }
3151
3152 void manager_send_unit_plymouth(Manager *m, Unit *u) {
3153 static const union sockaddr_union sa = PLYMOUTH_SOCKET;
3154 _cleanup_free_ char *message = NULL;
3155 _cleanup_close_ int fd = -1;
3156 int n = 0;
3157
3158 /* Don't generate plymouth events if the service was already
3159 * started and we're just deserializing */
3160 if (MANAGER_IS_RELOADING(m))
3161 return;
3162
3163 if (!MANAGER_IS_SYSTEM(m))
3164 return;
3165
3166 if (detect_container() > 0)
3167 return;
3168
3169 if (!IN_SET(u->type, UNIT_SERVICE, UNIT_MOUNT, UNIT_SWAP))
3170 return;
3171
3172 /* We set SOCK_NONBLOCK here so that we rather drop the
3173 * message then wait for plymouth */
3174 fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
3175 if (fd < 0) {
3176 log_error_errno(errno, "socket() failed: %m");
3177 return;
3178 }
3179
3180 if (connect(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0) {
3181 if (!IN_SET(errno, EAGAIN, ENOENT) && !ERRNO_IS_DISCONNECT(errno))
3182 log_error_errno(errno, "connect() failed: %m");
3183 return;
3184 }
3185
3186 if (asprintf(&message, "U\002%c%s%n", (int) (strlen(u->id) + 1), u->id, &n) < 0)
3187 return (void) log_oom();
3188
3189 errno = 0;
3190 if (write(fd, message, n + 1) != n + 1)
3191 if (!IN_SET(errno, EAGAIN, ENOENT) && !ERRNO_IS_DISCONNECT(errno))
3192 log_error_errno(errno, "Failed to write Plymouth message: %m");
3193 }
3194
3195 usec_t manager_get_watchdog(Manager *m, WatchdogType t) {
3196 assert(m);
3197
3198 if (MANAGER_IS_USER(m))
3199 return USEC_INFINITY;
3200
3201 if (timestamp_is_set(m->watchdog_overridden[t]))
3202 return m->watchdog_overridden[t];
3203
3204 return m->watchdog[t];
3205 }
3206
3207 void manager_set_watchdog(Manager *m, WatchdogType t, usec_t timeout) {
3208
3209 assert(m);
3210
3211 if (MANAGER_IS_USER(m))
3212 return;
3213
3214 if (m->watchdog[t] == timeout)
3215 return;
3216
3217 if (t == WATCHDOG_RUNTIME)
3218 if (!timestamp_is_set(m->watchdog_overridden[WATCHDOG_RUNTIME]))
3219 (void) watchdog_setup(timeout);
3220
3221 m->watchdog[t] = timeout;
3222 }
3223
3224 int manager_override_watchdog(Manager *m, WatchdogType t, usec_t timeout) {
3225
3226 assert(m);
3227
3228 if (MANAGER_IS_USER(m))
3229 return 0;
3230
3231 if (m->watchdog_overridden[t] == timeout)
3232 return 0;
3233
3234 if (t == WATCHDOG_RUNTIME) {
3235 usec_t usec = timestamp_is_set(timeout) ? timeout : m->watchdog[t];
3236
3237 (void) watchdog_setup(usec);
3238 }
3239
3240 m->watchdog_overridden[t] = timeout;
3241 return 0;
3242 }
3243
3244 int manager_reload(Manager *m) {
3245 _unused_ _cleanup_(manager_reloading_stopp) Manager *reloading = NULL;
3246 _cleanup_fdset_free_ FDSet *fds = NULL;
3247 _cleanup_fclose_ FILE *f = NULL;
3248 int r;
3249
3250 assert(m);
3251
3252 r = manager_open_serialization(m, &f);
3253 if (r < 0)
3254 return log_error_errno(r, "Failed to create serialization file: %m");
3255
3256 fds = fdset_new();
3257 if (!fds)
3258 return log_oom();
3259
3260 /* We are officially in reload mode from here on. */
3261 reloading = manager_reloading_start(m);
3262
3263 r = manager_serialize(m, f, fds, false);
3264 if (r < 0)
3265 return r;
3266
3267 if (fseeko(f, 0, SEEK_SET) < 0)
3268 return log_error_errno(errno, "Failed to seek to beginning of serialization: %m");
3269
3270 /* 💀 This is the point of no return, from here on there is no way back. 💀 */
3271 reloading = NULL;
3272
3273 bus_manager_send_reloading(m, true);
3274
3275 /* Start by flushing out all jobs and units, all generated units, all runtime environments, all dynamic users
3276 * and everything else that is worth flushing out. We'll get it all back from the serialization — if we need
3277 * it. */
3278
3279 manager_clear_jobs_and_units(m);
3280 lookup_paths_flush_generator(&m->lookup_paths);
3281 lookup_paths_free(&m->lookup_paths);
3282 exec_runtime_vacuum(m);
3283 dynamic_user_vacuum(m, false);
3284 m->uid_refs = hashmap_free(m->uid_refs);
3285 m->gid_refs = hashmap_free(m->gid_refs);
3286
3287 r = lookup_paths_init(&m->lookup_paths, m->unit_file_scope, 0, NULL);
3288 if (r < 0)
3289 log_warning_errno(r, "Failed to initialize path lookup table, ignoring: %m");
3290
3291 (void) manager_run_environment_generators(m);
3292 (void) manager_run_generators(m);
3293
3294 lookup_paths_log(&m->lookup_paths);
3295
3296 /* We flushed out generated files, for which we don't watch mtime, so we should flush the old map. */
3297 manager_free_unit_name_maps(m);
3298
3299 /* First, enumerate what we can from kernel and suchlike */
3300 manager_enumerate_perpetual(m);
3301 manager_enumerate(m);
3302
3303 /* Second, deserialize our stored data */
3304 r = manager_deserialize(m, f, fds);
3305 if (r < 0)
3306 log_warning_errno(r, "Deserialization failed, proceeding anyway: %m");
3307
3308 /* We don't need the serialization anymore */
3309 f = safe_fclose(f);
3310
3311 /* Re-register notify_fd as event source, and set up other sockets/communication channels we might need */
3312 (void) manager_setup_notify(m);
3313 (void) manager_setup_cgroups_agent(m);
3314 (void) manager_setup_user_lookup_fd(m);
3315
3316 /* Third, fire things up! */
3317 manager_coldplug(m);
3318
3319 /* Clean up runtime objects no longer referenced */
3320 manager_vacuum(m);
3321
3322 /* Clean up deserialized tracked clients */
3323 m->deserialized_subscribed = strv_free(m->deserialized_subscribed);
3324
3325 /* Consider the reload process complete now. */
3326 assert(m->n_reloading > 0);
3327 m->n_reloading--;
3328
3329 /* On manager reloading, device tag data should exists, thus, we should honor the results of device
3330 * enumeration. The flag should be always set correctly by the serialized data, but it may fail. So,
3331 * let's always set the flag here for safety. */
3332 m->honor_device_enumeration = true;
3333
3334 manager_ready(m);
3335
3336 m->send_reloading_done = true;
3337 return 0;
3338 }
3339
3340 void manager_reset_failed(Manager *m) {
3341 Unit *u;
3342
3343 assert(m);
3344
3345 HASHMAP_FOREACH(u, m->units)
3346 unit_reset_failed(u);
3347 }
3348
3349 bool manager_unit_inactive_or_pending(Manager *m, const char *name) {
3350 Unit *u;
3351
3352 assert(m);
3353 assert(name);
3354
3355 /* Returns true if the unit is inactive or going down */
3356 u = manager_get_unit(m, name);
3357 if (!u)
3358 return true;
3359
3360 return unit_inactive_or_pending(u);
3361 }
3362
3363 static void log_taint_string(Manager *m) {
3364 _cleanup_free_ char *taint = NULL;
3365
3366 assert(m);
3367
3368 if (MANAGER_IS_USER(m) || m->taint_logged)
3369 return;
3370
3371 m->taint_logged = true; /* only check for taint once */
3372
3373 taint = manager_taint_string(m);
3374 if (isempty(taint))
3375 return;
3376
3377 log_struct(LOG_NOTICE,
3378 LOG_MESSAGE("System is tainted: %s", taint),
3379 "TAINT=%s", taint,
3380 "MESSAGE_ID=" SD_MESSAGE_TAINTED_STR);
3381 }
3382
3383 static void manager_notify_finished(Manager *m) {
3384 usec_t firmware_usec, loader_usec, kernel_usec, initrd_usec, userspace_usec, total_usec;
3385
3386 if (MANAGER_IS_TEST_RUN(m))
3387 return;
3388
3389 if (MANAGER_IS_SYSTEM(m) && detect_container() <= 0) {
3390 char buf[FORMAT_TIMESPAN_MAX + STRLEN(" (firmware) + ") + FORMAT_TIMESPAN_MAX + STRLEN(" (loader) + ")]
3391 = {};
3392 char *p = buf;
3393 size_t size = sizeof buf;
3394
3395 /* Note that MANAGER_TIMESTAMP_KERNEL's monotonic value is always at 0, and
3396 * MANAGER_TIMESTAMP_FIRMWARE's and MANAGER_TIMESTAMP_LOADER's monotonic value should be considered
3397 * negative values. */
3398
3399 firmware_usec = m->timestamps[MANAGER_TIMESTAMP_FIRMWARE].monotonic - m->timestamps[MANAGER_TIMESTAMP_LOADER].monotonic;
3400 loader_usec = m->timestamps[MANAGER_TIMESTAMP_LOADER].monotonic - m->timestamps[MANAGER_TIMESTAMP_KERNEL].monotonic;
3401 userspace_usec = m->timestamps[MANAGER_TIMESTAMP_FINISH].monotonic - m->timestamps[MANAGER_TIMESTAMP_USERSPACE].monotonic;
3402 total_usec = m->timestamps[MANAGER_TIMESTAMP_FIRMWARE].monotonic + m->timestamps[MANAGER_TIMESTAMP_FINISH].monotonic;
3403
3404 if (firmware_usec > 0)
3405 size = strpcpyf(&p, size, "%s (firmware) + ", FORMAT_TIMESPAN(firmware_usec, USEC_PER_MSEC));
3406 if (loader_usec > 0)
3407 size = strpcpyf(&p, size, "%s (loader) + ", FORMAT_TIMESPAN(loader_usec, USEC_PER_MSEC));
3408
3409 if (dual_timestamp_is_set(&m->timestamps[MANAGER_TIMESTAMP_INITRD])) {
3410
3411 /* The initrd case on bare-metal */
3412 kernel_usec = m->timestamps[MANAGER_TIMESTAMP_INITRD].monotonic - m->timestamps[MANAGER_TIMESTAMP_KERNEL].monotonic;
3413 initrd_usec = m->timestamps[MANAGER_TIMESTAMP_USERSPACE].monotonic - m->timestamps[MANAGER_TIMESTAMP_INITRD].monotonic;
3414
3415 log_struct(LOG_INFO,
3416 "MESSAGE_ID=" SD_MESSAGE_STARTUP_FINISHED_STR,
3417 "KERNEL_USEC="USEC_FMT, kernel_usec,
3418 "INITRD_USEC="USEC_FMT, initrd_usec,
3419 "USERSPACE_USEC="USEC_FMT, userspace_usec,
3420 LOG_MESSAGE("Startup finished in %s%s (kernel) + %s (initrd) + %s (userspace) = %s.",
3421 buf,
3422 FORMAT_TIMESPAN(kernel_usec, USEC_PER_MSEC),
3423 FORMAT_TIMESPAN(initrd_usec, USEC_PER_MSEC),
3424 FORMAT_TIMESPAN(userspace_usec, USEC_PER_MSEC),
3425 FORMAT_TIMESPAN(total_usec, USEC_PER_MSEC)));
3426 } else {
3427 /* The initrd-less case on bare-metal */
3428
3429 kernel_usec = m->timestamps[MANAGER_TIMESTAMP_USERSPACE].monotonic - m->timestamps[MANAGER_TIMESTAMP_KERNEL].monotonic;
3430 initrd_usec = 0;
3431
3432 log_struct(LOG_INFO,
3433 "MESSAGE_ID=" SD_MESSAGE_STARTUP_FINISHED_STR,
3434 "KERNEL_USEC="USEC_FMT, kernel_usec,
3435 "USERSPACE_USEC="USEC_FMT, userspace_usec,
3436 LOG_MESSAGE("Startup finished in %s%s (kernel) + %s (userspace) = %s.",
3437 buf,
3438 FORMAT_TIMESPAN(kernel_usec, USEC_PER_MSEC),
3439 FORMAT_TIMESPAN(userspace_usec, USEC_PER_MSEC),
3440 FORMAT_TIMESPAN(total_usec, USEC_PER_MSEC)));
3441 }
3442 } else {
3443 /* The container and --user case */
3444 firmware_usec = loader_usec = initrd_usec = kernel_usec = 0;
3445 total_usec = userspace_usec = m->timestamps[MANAGER_TIMESTAMP_FINISH].monotonic - m->timestamps[MANAGER_TIMESTAMP_USERSPACE].monotonic;
3446
3447 log_struct(LOG_INFO,
3448 "MESSAGE_ID=" SD_MESSAGE_USER_STARTUP_FINISHED_STR,
3449 "USERSPACE_USEC="USEC_FMT, userspace_usec,
3450 LOG_MESSAGE("Startup finished in %s.",
3451 FORMAT_TIMESPAN(total_usec, USEC_PER_MSEC)));
3452 }
3453
3454 bus_manager_send_finished(m, firmware_usec, loader_usec, kernel_usec, initrd_usec, userspace_usec, total_usec);
3455
3456 log_taint_string(m);
3457 }
3458
3459 static void user_manager_send_ready(Manager *m) {
3460 assert(m);
3461
3462 /* We send READY=1 on reaching basic.target only when running in --user mode. */
3463 if (!MANAGER_IS_USER(m) || m->ready_sent)
3464 return;
3465
3466 sd_notifyf(false,
3467 "READY=1\n"
3468 "STATUS=Reached " SPECIAL_BASIC_TARGET ".");
3469 m->ready_sent = true;
3470 m->status_ready = false;
3471 }
3472
3473 static void manager_send_ready(Manager *m) {
3474 if (m->ready_sent && m->status_ready)
3475 /* Skip the notification if nothing changed. */
3476 return;
3477
3478 sd_notifyf(false,
3479 "%sSTATUS=Ready.",
3480 m->ready_sent ? "READY=1\n" : "");
3481 m->ready_sent = m->status_ready = true;
3482 }
3483
3484 static void manager_check_basic_target(Manager *m) {
3485 Unit *u;
3486
3487 assert(m);
3488
3489 /* Small shortcut */
3490 if (m->ready_sent && m->taint_logged)
3491 return;
3492
3493 u = manager_get_unit(m, SPECIAL_BASIC_TARGET);
3494 if (!u || !UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u)))
3495 return;
3496
3497 /* For user managers, send out READY=1 as soon as we reach basic.target */
3498 user_manager_send_ready(m);
3499
3500 /* Log the taint string as soon as we reach basic.target */
3501 log_taint_string(m);
3502 }
3503
3504 void manager_check_finished(Manager *m) {
3505 assert(m);
3506
3507 if (MANAGER_IS_RELOADING(m))
3508 return;
3509
3510 /* Verify that we have entered the event loop already, and not left it again. */
3511 if (!MANAGER_IS_RUNNING(m))
3512 return;
3513
3514 manager_check_basic_target(m);
3515
3516 if (hashmap_size(m->jobs) > 0) {
3517 if (m->jobs_in_progress_event_source)
3518 /* Ignore any failure, this is only for feedback */
3519 (void) sd_event_source_set_time(m->jobs_in_progress_event_source,
3520 manager_watch_jobs_next_time(m));
3521 return;
3522 }
3523
3524 /* The jobs hashmap tends to grow a lot during boot, and then it's not reused until shutdown. Let's
3525 kill the hashmap if it is relatively large. */
3526 if (hashmap_buckets(m->jobs) > hashmap_size(m->units) / 10)
3527 m->jobs = hashmap_free(m->jobs);
3528
3529 manager_send_ready(m);
3530
3531 if (MANAGER_IS_FINISHED(m))
3532 return;
3533
3534 manager_flip_auto_status(m, false, "boot finished");
3535
3536 /* Notify Type=idle units that we are done now */
3537 manager_close_idle_pipe(m);
3538
3539 /* Turn off confirm spawn now */
3540 m->confirm_spawn = NULL;
3541
3542 /* No need to update ask password status when we're going non-interactive */
3543 manager_close_ask_password(m);
3544
3545 /* This is no longer the first boot */
3546 manager_set_first_boot(m, false);
3547
3548 dual_timestamp_get(m->timestamps + MANAGER_TIMESTAMP_FINISH);
3549
3550 manager_notify_finished(m);
3551
3552 manager_invalidate_startup_units(m);
3553 }
3554
3555 static bool generator_path_any(const char* const* paths) {
3556 char **path;
3557 bool found = false;
3558
3559 /* Optimize by skipping the whole process by not creating output directories
3560 * if no generators are found. */
3561 STRV_FOREACH(path, (char**) paths)
3562 if (access(*path, F_OK) == 0)
3563 found = true;
3564 else if (errno != ENOENT)
3565 log_warning_errno(errno, "Failed to open generator directory %s: %m", *path);
3566
3567 return found;
3568 }
3569
3570 static int manager_run_environment_generators(Manager *m) {
3571 char **tmp = NULL; /* this is only used in the forked process, no cleanup here */
3572 _cleanup_strv_free_ char **paths = NULL;
3573 void* args[] = {
3574 [STDOUT_GENERATE] = &tmp,
3575 [STDOUT_COLLECT] = &tmp,
3576 [STDOUT_CONSUME] = &m->transient_environment,
3577 };
3578 int r;
3579
3580 if (MANAGER_IS_TEST_RUN(m) && !(m->test_run_flags & MANAGER_TEST_RUN_ENV_GENERATORS))
3581 return 0;
3582
3583 paths = env_generator_binary_paths(MANAGER_IS_SYSTEM(m));
3584 if (!paths)
3585 return log_oom();
3586
3587 if (!generator_path_any((const char* const*) paths))
3588 return 0;
3589
3590 RUN_WITH_UMASK(0022)
3591 r = execute_directories((const char* const*) paths, DEFAULT_TIMEOUT_USEC, gather_environment,
3592 args, NULL, m->transient_environment,
3593 EXEC_DIR_PARALLEL | EXEC_DIR_IGNORE_ERRORS | EXEC_DIR_SET_SYSTEMD_EXEC_PID);
3594 return r;
3595 }
3596
3597 static int manager_run_generators(Manager *m) {
3598 _cleanup_strv_free_ char **paths = NULL;
3599 const char *argv[5];
3600 int r;
3601
3602 assert(m);
3603
3604 if (MANAGER_IS_TEST_RUN(m) && !(m->test_run_flags & MANAGER_TEST_RUN_GENERATORS))
3605 return 0;
3606
3607 paths = generator_binary_paths(m->unit_file_scope);
3608 if (!paths)
3609 return log_oom();
3610
3611 if (!generator_path_any((const char* const*) paths))
3612 return 0;
3613
3614 r = lookup_paths_mkdir_generator(&m->lookup_paths);
3615 if (r < 0) {
3616 log_error_errno(r, "Failed to create generator directories: %m");
3617 goto finish;
3618 }
3619
3620 argv[0] = NULL; /* Leave this empty, execute_directory() will fill something in */
3621 argv[1] = m->lookup_paths.generator;
3622 argv[2] = m->lookup_paths.generator_early;
3623 argv[3] = m->lookup_paths.generator_late;
3624 argv[4] = NULL;
3625
3626 RUN_WITH_UMASK(0022)
3627 (void) execute_directories((const char* const*) paths, DEFAULT_TIMEOUT_USEC, NULL, NULL,
3628 (char**) argv, m->transient_environment,
3629 EXEC_DIR_PARALLEL | EXEC_DIR_IGNORE_ERRORS | EXEC_DIR_SET_SYSTEMD_EXEC_PID);
3630
3631 r = 0;
3632
3633 finish:
3634 lookup_paths_trim_generator(&m->lookup_paths);
3635 return r;
3636 }
3637
3638 int manager_transient_environment_add(Manager *m, char **plus) {
3639 char **a;
3640
3641 assert(m);
3642
3643 if (strv_isempty(plus))
3644 return 0;
3645
3646 a = strv_env_merge(m->transient_environment, plus);
3647 if (!a)
3648 return log_oom();
3649
3650 sanitize_environment(a);
3651
3652 return strv_free_and_replace(m->transient_environment, a);
3653 }
3654
3655 int manager_client_environment_modify(
3656 Manager *m,
3657 char **minus,
3658 char **plus) {
3659
3660 char **a = NULL, **b = NULL, **l;
3661
3662 assert(m);
3663
3664 if (strv_isempty(minus) && strv_isempty(plus))
3665 return 0;
3666
3667 l = m->client_environment;
3668
3669 if (!strv_isempty(minus)) {
3670 a = strv_env_delete(l, 1, minus);
3671 if (!a)
3672 return -ENOMEM;
3673
3674 l = a;
3675 }
3676
3677 if (!strv_isempty(plus)) {
3678 b = strv_env_merge(l, plus);
3679 if (!b) {
3680 strv_free(a);
3681 return -ENOMEM;
3682 }
3683
3684 l = b;
3685 }
3686
3687 if (m->client_environment != l)
3688 strv_free(m->client_environment);
3689
3690 if (a != l)
3691 strv_free(a);
3692 if (b != l)
3693 strv_free(b);
3694
3695 m->client_environment = sanitize_environment(l);
3696 return 0;
3697 }
3698
3699 int manager_get_effective_environment(Manager *m, char ***ret) {
3700 char **l;
3701
3702 assert(m);
3703 assert(ret);
3704
3705 l = strv_env_merge(m->transient_environment, m->client_environment);
3706 if (!l)
3707 return -ENOMEM;
3708
3709 *ret = l;
3710 return 0;
3711 }
3712
3713 int manager_set_default_rlimits(Manager *m, struct rlimit **default_rlimit) {
3714 assert(m);
3715
3716 for (unsigned i = 0; i < _RLIMIT_MAX; i++) {
3717 m->rlimit[i] = mfree(m->rlimit[i]);
3718
3719 if (!default_rlimit[i])
3720 continue;
3721
3722 m->rlimit[i] = newdup(struct rlimit, default_rlimit[i], 1);
3723 if (!m->rlimit[i])
3724 return log_oom();
3725 }
3726
3727 return 0;
3728 }
3729
3730 void manager_recheck_dbus(Manager *m) {
3731 assert(m);
3732
3733 /* Connects to the bus if the dbus service and socket are running. If we are running in user mode this is all
3734 * it does. In system mode we'll also connect to the system bus (which will most likely just reuse the
3735 * connection of the API bus). That's because the system bus after all runs as service of the system instance,
3736 * while in the user instance we can assume it's already there. */
3737
3738 if (MANAGER_IS_RELOADING(m))
3739 return; /* don't check while we are reloading… */
3740
3741 if (manager_dbus_is_running(m, false)) {
3742 (void) bus_init_api(m);
3743
3744 if (MANAGER_IS_SYSTEM(m))
3745 (void) bus_init_system(m);
3746 } else {
3747 (void) bus_done_api(m);
3748
3749 if (MANAGER_IS_SYSTEM(m))
3750 (void) bus_done_system(m);
3751 }
3752 }
3753
3754 static bool manager_journal_is_running(Manager *m) {
3755 Unit *u;
3756
3757 assert(m);
3758
3759 if (MANAGER_IS_TEST_RUN(m))
3760 return false;
3761
3762 /* If we are the user manager we can safely assume that the journal is up */
3763 if (!MANAGER_IS_SYSTEM(m))
3764 return true;
3765
3766 /* Check that the socket is not only up, but in RUNNING state */
3767 u = manager_get_unit(m, SPECIAL_JOURNALD_SOCKET);
3768 if (!u)
3769 return false;
3770 if (SOCKET(u)->state != SOCKET_RUNNING)
3771 return false;
3772
3773 /* Similar, check if the daemon itself is fully up, too */
3774 u = manager_get_unit(m, SPECIAL_JOURNALD_SERVICE);
3775 if (!u)
3776 return false;
3777 if (!IN_SET(SERVICE(u)->state, SERVICE_RELOAD, SERVICE_RUNNING))
3778 return false;
3779
3780 return true;
3781 }
3782
3783 void disable_printk_ratelimit(void) {
3784 /* Disable kernel's printk ratelimit.
3785 *
3786 * Logging to /dev/kmsg is most useful during early boot and shutdown, where normal logging
3787 * mechanisms are not available. The semantics of this sysctl are such that any kernel command-line
3788 * setting takes precedence. */
3789 int r;
3790
3791 r = sysctl_write("kernel/printk_devkmsg", "on");
3792 if (r < 0)
3793 log_debug_errno(r, "Failed to set sysctl kernel.printk_devkmsg=on: %m");
3794 }
3795
3796 void manager_recheck_journal(Manager *m) {
3797
3798 assert(m);
3799
3800 /* Don't bother with this unless we are in the special situation of being PID 1 */
3801 if (getpid_cached() != 1)
3802 return;
3803
3804 /* Don't check this while we are reloading, things might still change */
3805 if (MANAGER_IS_RELOADING(m))
3806 return;
3807
3808 /* The journal is fully and entirely up? If so, let's permit logging to it, if that's configured. If the
3809 * journal is down, don't ever log to it, otherwise we might end up deadlocking ourselves as we might trigger
3810 * an activation ourselves we can't fulfill. */
3811 log_set_prohibit_ipc(!manager_journal_is_running(m));
3812 log_open();
3813 }
3814
3815 static ShowStatus manager_get_show_status(Manager *m) {
3816 assert(m);
3817
3818 if (MANAGER_IS_USER(m))
3819 return _SHOW_STATUS_INVALID;
3820
3821 if (m->show_status_overridden != _SHOW_STATUS_INVALID)
3822 return m->show_status_overridden;
3823
3824 return m->show_status;
3825 }
3826
3827 bool manager_get_show_status_on(Manager *m) {
3828 assert(m);
3829
3830 return show_status_on(manager_get_show_status(m));
3831 }
3832
3833 static void set_show_status_marker(bool b) {
3834 if (b)
3835 (void) touch("/run/systemd/show-status");
3836 else
3837 (void) unlink("/run/systemd/show-status");
3838 }
3839
3840 void manager_set_show_status(Manager *m, ShowStatus mode, const char *reason) {
3841 assert(m);
3842 assert(reason);
3843 assert(mode >= 0 && mode < _SHOW_STATUS_MAX);
3844
3845 if (MANAGER_IS_USER(m))
3846 return;
3847
3848 if (mode == m->show_status)
3849 return;
3850
3851 if (m->show_status_overridden == _SHOW_STATUS_INVALID) {
3852 bool enabled;
3853
3854 enabled = show_status_on(mode);
3855 log_debug("%s (%s) showing of status (%s).",
3856 enabled ? "Enabling" : "Disabling",
3857 strna(show_status_to_string(mode)),
3858 reason);
3859
3860 set_show_status_marker(enabled);
3861 }
3862
3863 m->show_status = mode;
3864 }
3865
3866 void manager_override_show_status(Manager *m, ShowStatus mode, const char *reason) {
3867 assert(m);
3868 assert(mode < _SHOW_STATUS_MAX);
3869
3870 if (MANAGER_IS_USER(m))
3871 return;
3872
3873 if (mode == m->show_status_overridden)
3874 return;
3875
3876 m->show_status_overridden = mode;
3877
3878 if (mode == _SHOW_STATUS_INVALID)
3879 mode = m->show_status;
3880
3881 log_debug("%s (%s) showing of status (%s).",
3882 m->show_status_overridden != _SHOW_STATUS_INVALID ? "Overriding" : "Restoring",
3883 strna(show_status_to_string(mode)),
3884 reason);
3885
3886 set_show_status_marker(show_status_on(mode));
3887 }
3888
3889 const char *manager_get_confirm_spawn(Manager *m) {
3890 static int last_errno = 0;
3891 struct stat st;
3892 int r;
3893
3894 assert(m);
3895
3896 /* Here's the deal: we want to test the validity of the console but don't want
3897 * PID1 to go through the whole console process which might block. But we also
3898 * want to warn the user only once if something is wrong with the console so we
3899 * cannot do the sanity checks after spawning our children. So here we simply do
3900 * really basic tests to hopefully trap common errors.
3901 *
3902 * If the console suddenly disappear at the time our children will really it
3903 * then they will simply fail to acquire it and a positive answer will be
3904 * assumed. New children will fall back to /dev/console though.
3905 *
3906 * Note: TTYs are devices that can come and go any time, and frequently aren't
3907 * available yet during early boot (consider a USB rs232 dongle...). If for any
3908 * reason the configured console is not ready, we fall back to the default
3909 * console. */
3910
3911 if (!m->confirm_spawn || path_equal(m->confirm_spawn, "/dev/console"))
3912 return m->confirm_spawn;
3913
3914 if (stat(m->confirm_spawn, &st) < 0) {
3915 r = -errno;
3916 goto fail;
3917 }
3918
3919 if (!S_ISCHR(st.st_mode)) {
3920 r = -ENOTTY;
3921 goto fail;
3922 }
3923
3924 last_errno = 0;
3925 return m->confirm_spawn;
3926
3927 fail:
3928 if (last_errno != r)
3929 last_errno = log_warning_errno(r, "Failed to open %s, using default console: %m", m->confirm_spawn);
3930
3931 return "/dev/console";
3932 }
3933
3934 void manager_set_first_boot(Manager *m, bool b) {
3935 assert(m);
3936
3937 if (!MANAGER_IS_SYSTEM(m))
3938 return;
3939
3940 if (m->first_boot != (int) b) {
3941 if (b)
3942 (void) touch("/run/systemd/first-boot");
3943 else
3944 (void) unlink("/run/systemd/first-boot");
3945 }
3946
3947 m->first_boot = b;
3948 }
3949
3950 void manager_disable_confirm_spawn(void) {
3951 (void) touch("/run/systemd/confirm_spawn_disabled");
3952 }
3953
3954 bool manager_is_confirm_spawn_disabled(Manager *m) {
3955 if (!m->confirm_spawn)
3956 return true;
3957
3958 return access("/run/systemd/confirm_spawn_disabled", F_OK) >= 0;
3959 }
3960
3961 static bool manager_should_show_status(Manager *m, StatusType type) {
3962 assert(m);
3963
3964 if (!MANAGER_IS_SYSTEM(m))
3965 return false;
3966
3967 if (m->no_console_output)
3968 return false;
3969
3970 if (!IN_SET(manager_state(m), MANAGER_INITIALIZING, MANAGER_STARTING, MANAGER_STOPPING))
3971 return false;
3972
3973 /* If we cannot find out the status properly, just proceed. */
3974 if (type != STATUS_TYPE_EMERGENCY && manager_check_ask_password(m) > 0)
3975 return false;
3976
3977 if (type == STATUS_TYPE_NOTICE && m->show_status != SHOW_STATUS_NO)
3978 return true;
3979
3980 return manager_get_show_status_on(m);
3981 }
3982
3983 void manager_status_printf(Manager *m, StatusType type, const char *status, const char *format, ...) {
3984 va_list ap;
3985
3986 /* If m is NULL, assume we're after shutdown and let the messages through. */
3987
3988 if (m && !manager_should_show_status(m, type))
3989 return;
3990
3991 /* XXX We should totally drop the check for ephemeral here
3992 * and thus effectively make 'Type=idle' pointless. */
3993 if (type == STATUS_TYPE_EPHEMERAL && m && m->n_on_console > 0)
3994 return;
3995
3996 va_start(ap, format);
3997 status_vprintf(status, SHOW_STATUS_ELLIPSIZE|(type == STATUS_TYPE_EPHEMERAL ? SHOW_STATUS_EPHEMERAL : 0), format, ap);
3998 va_end(ap);
3999 }
4000
4001 Set* manager_get_units_requiring_mounts_for(Manager *m, const char *path) {
4002 assert(m);
4003 assert(path);
4004
4005 if (path_equal(path, "/"))
4006 path = "";
4007
4008 return hashmap_get(m->units_requiring_mounts_for, path);
4009 }
4010
4011 int manager_update_failed_units(Manager *m, Unit *u, bool failed) {
4012 unsigned size;
4013 int r;
4014
4015 assert(m);
4016 assert(u->manager == m);
4017
4018 size = set_size(m->failed_units);
4019
4020 if (failed) {
4021 r = set_ensure_put(&m->failed_units, NULL, u);
4022 if (r < 0)
4023 return log_oom();
4024 } else
4025 (void) set_remove(m->failed_units, u);
4026
4027 if (set_size(m->failed_units) != size)
4028 bus_manager_send_change_signal(m);
4029
4030 return 0;
4031 }
4032
4033 ManagerState manager_state(Manager *m) {
4034 Unit *u;
4035
4036 assert(m);
4037
4038 /* Is the special shutdown target active or queued? If so, we are in shutdown state */
4039 u = manager_get_unit(m, SPECIAL_SHUTDOWN_TARGET);
4040 if (u && unit_active_or_pending(u))
4041 return MANAGER_STOPPING;
4042
4043 /* Did we ever finish booting? If not then we are still starting up */
4044 if (!MANAGER_IS_FINISHED(m)) {
4045
4046 u = manager_get_unit(m, SPECIAL_BASIC_TARGET);
4047 if (!u || !UNIT_IS_ACTIVE_OR_RELOADING(unit_active_state(u)))
4048 return MANAGER_INITIALIZING;
4049
4050 return MANAGER_STARTING;
4051 }
4052
4053 if (MANAGER_IS_SYSTEM(m)) {
4054 /* Are the rescue or emergency targets active or queued? If so we are in maintenance state */
4055 u = manager_get_unit(m, SPECIAL_RESCUE_TARGET);
4056 if (u && unit_active_or_pending(u))
4057 return MANAGER_MAINTENANCE;
4058
4059 u = manager_get_unit(m, SPECIAL_EMERGENCY_TARGET);
4060 if (u && unit_active_or_pending(u))
4061 return MANAGER_MAINTENANCE;
4062 }
4063
4064 /* Are there any failed units? If so, we are in degraded mode */
4065 if (set_size(m->failed_units) > 0)
4066 return MANAGER_DEGRADED;
4067
4068 return MANAGER_RUNNING;
4069 }
4070
4071 static void manager_unref_uid_internal(
4072 Hashmap *uid_refs,
4073 uid_t uid,
4074 bool destroy_now,
4075 int (*_clean_ipc)(uid_t uid)) {
4076
4077 uint32_t c, n;
4078
4079 assert(uid_is_valid(uid));
4080 assert(_clean_ipc);
4081
4082 /* A generic implementation, covering both manager_unref_uid() and manager_unref_gid(), under the assumption
4083 * that uid_t and gid_t are actually defined the same way, with the same validity rules.
4084 *
4085 * We store a hashmap where the key is the UID/GID and the value is a 32bit reference counter, whose highest
4086 * bit is used as flag for marking UIDs/GIDs whose IPC objects to remove when the last reference to the UID/GID
4087 * is dropped. The flag is set to on, once at least one reference from a unit where RemoveIPC= is set is added
4088 * on a UID/GID. It is reset when the UID's/GID's reference counter drops to 0 again. */
4089
4090 assert_cc(sizeof(uid_t) == sizeof(gid_t));
4091 assert_cc(UID_INVALID == (uid_t) GID_INVALID);
4092
4093 if (uid == 0) /* We don't keep track of root, and will never destroy it */
4094 return;
4095
4096 c = PTR_TO_UINT32(hashmap_get(uid_refs, UID_TO_PTR(uid)));
4097
4098 n = c & ~DESTROY_IPC_FLAG;
4099 assert(n > 0);
4100 n--;
4101
4102 if (destroy_now && n == 0) {
4103 hashmap_remove(uid_refs, UID_TO_PTR(uid));
4104
4105 if (c & DESTROY_IPC_FLAG) {
4106 log_debug("%s " UID_FMT " is no longer referenced, cleaning up its IPC.",
4107 _clean_ipc == clean_ipc_by_uid ? "UID" : "GID",
4108 uid);
4109 (void) _clean_ipc(uid);
4110 }
4111 } else {
4112 c = n | (c & DESTROY_IPC_FLAG);
4113 assert_se(hashmap_update(uid_refs, UID_TO_PTR(uid), UINT32_TO_PTR(c)) >= 0);
4114 }
4115 }
4116
4117 void manager_unref_uid(Manager *m, uid_t uid, bool destroy_now) {
4118 manager_unref_uid_internal(m->uid_refs, uid, destroy_now, clean_ipc_by_uid);
4119 }
4120
4121 void manager_unref_gid(Manager *m, gid_t gid, bool destroy_now) {
4122 manager_unref_uid_internal(m->gid_refs, (uid_t) gid, destroy_now, clean_ipc_by_gid);
4123 }
4124
4125 static int manager_ref_uid_internal(
4126 Hashmap **uid_refs,
4127 uid_t uid,
4128 bool clean_ipc) {
4129
4130 uint32_t c, n;
4131 int r;
4132
4133 assert(uid_refs);
4134 assert(uid_is_valid(uid));
4135
4136 /* A generic implementation, covering both manager_ref_uid() and manager_ref_gid(), under the assumption
4137 * that uid_t and gid_t are actually defined the same way, with the same validity rules. */
4138
4139 assert_cc(sizeof(uid_t) == sizeof(gid_t));
4140 assert_cc(UID_INVALID == (uid_t) GID_INVALID);
4141
4142 if (uid == 0) /* We don't keep track of root, and will never destroy it */
4143 return 0;
4144
4145 r = hashmap_ensure_allocated(uid_refs, &trivial_hash_ops);
4146 if (r < 0)
4147 return r;
4148
4149 c = PTR_TO_UINT32(hashmap_get(*uid_refs, UID_TO_PTR(uid)));
4150
4151 n = c & ~DESTROY_IPC_FLAG;
4152 n++;
4153
4154 if (n & DESTROY_IPC_FLAG) /* check for overflow */
4155 return -EOVERFLOW;
4156
4157 c = n | (c & DESTROY_IPC_FLAG) | (clean_ipc ? DESTROY_IPC_FLAG : 0);
4158
4159 return hashmap_replace(*uid_refs, UID_TO_PTR(uid), UINT32_TO_PTR(c));
4160 }
4161
4162 int manager_ref_uid(Manager *m, uid_t uid, bool clean_ipc) {
4163 return manager_ref_uid_internal(&m->uid_refs, uid, clean_ipc);
4164 }
4165
4166 int manager_ref_gid(Manager *m, gid_t gid, bool clean_ipc) {
4167 return manager_ref_uid_internal(&m->gid_refs, (uid_t) gid, clean_ipc);
4168 }
4169
4170 static void manager_vacuum_uid_refs_internal(
4171 Hashmap *uid_refs,
4172 int (*_clean_ipc)(uid_t uid)) {
4173
4174 void *p, *k;
4175
4176 assert(_clean_ipc);
4177
4178 HASHMAP_FOREACH_KEY(p, k, uid_refs) {
4179 uint32_t c, n;
4180 uid_t uid;
4181
4182 uid = PTR_TO_UID(k);
4183 c = PTR_TO_UINT32(p);
4184
4185 n = c & ~DESTROY_IPC_FLAG;
4186 if (n > 0)
4187 continue;
4188
4189 if (c & DESTROY_IPC_FLAG) {
4190 log_debug("Found unreferenced %s " UID_FMT " after reload/reexec. Cleaning up.",
4191 _clean_ipc == clean_ipc_by_uid ? "UID" : "GID",
4192 uid);
4193 (void) _clean_ipc(uid);
4194 }
4195
4196 assert_se(hashmap_remove(uid_refs, k) == p);
4197 }
4198 }
4199
4200 static void manager_vacuum_uid_refs(Manager *m) {
4201 manager_vacuum_uid_refs_internal(m->uid_refs, clean_ipc_by_uid);
4202 }
4203
4204 static void manager_vacuum_gid_refs(Manager *m) {
4205 manager_vacuum_uid_refs_internal(m->gid_refs, clean_ipc_by_gid);
4206 }
4207
4208 static void manager_vacuum(Manager *m) {
4209 assert(m);
4210
4211 /* Release any dynamic users no longer referenced */
4212 dynamic_user_vacuum(m, true);
4213
4214 /* Release any references to UIDs/GIDs no longer referenced, and destroy any IPC owned by them */
4215 manager_vacuum_uid_refs(m);
4216 manager_vacuum_gid_refs(m);
4217
4218 /* Release any runtimes no longer referenced */
4219 exec_runtime_vacuum(m);
4220 }
4221
4222 int manager_dispatch_user_lookup_fd(sd_event_source *source, int fd, uint32_t revents, void *userdata) {
4223 struct buffer {
4224 uid_t uid;
4225 gid_t gid;
4226 char unit_name[UNIT_NAME_MAX+1];
4227 } _packed_ buffer;
4228
4229 Manager *m = userdata;
4230 ssize_t l;
4231 size_t n;
4232 Unit *u;
4233
4234 assert_se(source);
4235 assert_se(m);
4236
4237 /* Invoked whenever a child process succeeded resolving its user/group to use and sent us the resulting UID/GID
4238 * in a datagram. We parse the datagram here and pass it off to the unit, so that it can add a reference to the
4239 * UID/GID so that it can destroy the UID/GID's IPC objects when the reference counter drops to 0. */
4240
4241 l = recv(fd, &buffer, sizeof(buffer), MSG_DONTWAIT);
4242 if (l < 0) {
4243 if (IN_SET(errno, EINTR, EAGAIN))
4244 return 0;
4245
4246 return log_error_errno(errno, "Failed to read from user lookup fd: %m");
4247 }
4248
4249 if ((size_t) l <= offsetof(struct buffer, unit_name)) {
4250 log_warning("Received too short user lookup message, ignoring.");
4251 return 0;
4252 }
4253
4254 if ((size_t) l > offsetof(struct buffer, unit_name) + UNIT_NAME_MAX) {
4255 log_warning("Received too long user lookup message, ignoring.");
4256 return 0;
4257 }
4258
4259 if (!uid_is_valid(buffer.uid) && !gid_is_valid(buffer.gid)) {
4260 log_warning("Got user lookup message with invalid UID/GID pair, ignoring.");
4261 return 0;
4262 }
4263
4264 n = (size_t) l - offsetof(struct buffer, unit_name);
4265 if (memchr(buffer.unit_name, 0, n)) {
4266 log_warning("Received lookup message with embedded NUL character, ignoring.");
4267 return 0;
4268 }
4269
4270 buffer.unit_name[n] = 0;
4271 u = manager_get_unit(m, buffer.unit_name);
4272 if (!u) {
4273 log_debug("Got user lookup message but unit doesn't exist, ignoring.");
4274 return 0;
4275 }
4276
4277 log_unit_debug(u, "User lookup succeeded: uid=" UID_FMT " gid=" GID_FMT, buffer.uid, buffer.gid);
4278
4279 unit_notify_user_lookup(u, buffer.uid, buffer.gid);
4280 return 0;
4281 }
4282
4283 char *manager_taint_string(Manager *m) {
4284 _cleanup_free_ char *destination = NULL, *overflowuid = NULL, *overflowgid = NULL;
4285 char *buf, *e;
4286 int r;
4287
4288 /* Returns a "taint string", e.g. "local-hwclock:var-run-bad".
4289 * Only things that are detected at runtime should be tagged
4290 * here. For stuff that is set during compilation, emit a warning
4291 * in the configuration phase. */
4292
4293 assert(m);
4294
4295 buf = new(char, sizeof("split-usr:"
4296 "cgroups-missing:"
4297 "cgrousv1:"
4298 "local-hwclock:"
4299 "var-run-bad:"
4300 "overflowuid-not-65534:"
4301 "overflowgid-not-65534:"));
4302 if (!buf)
4303 return NULL;
4304
4305 e = buf;
4306 buf[0] = 0;
4307
4308 if (m->taint_usr)
4309 e = stpcpy(e, "split-usr:");
4310
4311 if (access("/proc/cgroups", F_OK) < 0)
4312 e = stpcpy(e, "cgroups-missing:");
4313
4314 if (cg_all_unified() == 0)
4315 e = stpcpy(e, "cgroupsv1:");
4316
4317 if (clock_is_localtime(NULL) > 0)
4318 e = stpcpy(e, "local-hwclock:");
4319
4320 r = readlink_malloc("/var/run", &destination);
4321 if (r < 0 || !PATH_IN_SET(destination, "../run", "/run"))
4322 e = stpcpy(e, "var-run-bad:");
4323
4324 r = read_one_line_file("/proc/sys/kernel/overflowuid", &overflowuid);
4325 if (r >= 0 && !streq(overflowuid, "65534"))
4326 e = stpcpy(e, "overflowuid-not-65534:");
4327
4328 r = read_one_line_file("/proc/sys/kernel/overflowgid", &overflowgid);
4329 if (r >= 0 && !streq(overflowgid, "65534"))
4330 e = stpcpy(e, "overflowgid-not-65534:");
4331
4332 /* remove the last ':' */
4333 if (e != buf)
4334 e[-1] = 0;
4335
4336 return buf;
4337 }
4338
4339 void manager_ref_console(Manager *m) {
4340 assert(m);
4341
4342 m->n_on_console++;
4343 }
4344
4345 void manager_unref_console(Manager *m) {
4346
4347 assert(m->n_on_console > 0);
4348 m->n_on_console--;
4349
4350 if (m->n_on_console == 0)
4351 m->no_console_output = false; /* unset no_console_output flag, since the console is definitely free now */
4352 }
4353
4354 void manager_override_log_level(Manager *m, int level) {
4355 _cleanup_free_ char *s = NULL;
4356 assert(m);
4357
4358 if (!m->log_level_overridden) {
4359 m->original_log_level = log_get_max_level();
4360 m->log_level_overridden = true;
4361 }
4362
4363 (void) log_level_to_string_alloc(level, &s);
4364 log_info("Setting log level to %s.", strna(s));
4365
4366 log_set_max_level(level);
4367 }
4368
4369 void manager_restore_original_log_level(Manager *m) {
4370 _cleanup_free_ char *s = NULL;
4371 assert(m);
4372
4373 if (!m->log_level_overridden)
4374 return;
4375
4376 (void) log_level_to_string_alloc(m->original_log_level, &s);
4377 log_info("Restoring log level to original (%s).", strna(s));
4378
4379 log_set_max_level(m->original_log_level);
4380 m->log_level_overridden = false;
4381 }
4382
4383 void manager_override_log_target(Manager *m, LogTarget target) {
4384 assert(m);
4385
4386 if (!m->log_target_overridden) {
4387 m->original_log_target = log_get_target();
4388 m->log_target_overridden = true;
4389 }
4390
4391 log_info("Setting log target to %s.", log_target_to_string(target));
4392 log_set_target(target);
4393 }
4394
4395 void manager_restore_original_log_target(Manager *m) {
4396 assert(m);
4397
4398 if (!m->log_target_overridden)
4399 return;
4400
4401 log_info("Restoring log target to original %s.", log_target_to_string(m->original_log_target));
4402
4403 log_set_target(m->original_log_target);
4404 m->log_target_overridden = false;
4405 }
4406
4407 ManagerTimestamp manager_timestamp_initrd_mangle(ManagerTimestamp s) {
4408 if (in_initrd() &&
4409 s >= MANAGER_TIMESTAMP_SECURITY_START &&
4410 s <= MANAGER_TIMESTAMP_UNITS_LOAD_FINISH)
4411 return s - MANAGER_TIMESTAMP_SECURITY_START + MANAGER_TIMESTAMP_INITRD_SECURITY_START;
4412 return s;
4413 }
4414
4415 static const char *const manager_state_table[_MANAGER_STATE_MAX] = {
4416 [MANAGER_INITIALIZING] = "initializing",
4417 [MANAGER_STARTING] = "starting",
4418 [MANAGER_RUNNING] = "running",
4419 [MANAGER_DEGRADED] = "degraded",
4420 [MANAGER_MAINTENANCE] = "maintenance",
4421 [MANAGER_STOPPING] = "stopping",
4422 };
4423
4424 DEFINE_STRING_TABLE_LOOKUP(manager_state, ManagerState);
4425
4426 static const char *const manager_timestamp_table[_MANAGER_TIMESTAMP_MAX] = {
4427 [MANAGER_TIMESTAMP_FIRMWARE] = "firmware",
4428 [MANAGER_TIMESTAMP_LOADER] = "loader",
4429 [MANAGER_TIMESTAMP_KERNEL] = "kernel",
4430 [MANAGER_TIMESTAMP_INITRD] = "initrd",
4431 [MANAGER_TIMESTAMP_USERSPACE] = "userspace",
4432 [MANAGER_TIMESTAMP_FINISH] = "finish",
4433 [MANAGER_TIMESTAMP_SECURITY_START] = "security-start",
4434 [MANAGER_TIMESTAMP_SECURITY_FINISH] = "security-finish",
4435 [MANAGER_TIMESTAMP_GENERATORS_START] = "generators-start",
4436 [MANAGER_TIMESTAMP_GENERATORS_FINISH] = "generators-finish",
4437 [MANAGER_TIMESTAMP_UNITS_LOAD_START] = "units-load-start",
4438 [MANAGER_TIMESTAMP_UNITS_LOAD_FINISH] = "units-load-finish",
4439 [MANAGER_TIMESTAMP_INITRD_SECURITY_START] = "initrd-security-start",
4440 [MANAGER_TIMESTAMP_INITRD_SECURITY_FINISH] = "initrd-security-finish",
4441 [MANAGER_TIMESTAMP_INITRD_GENERATORS_START] = "initrd-generators-start",
4442 [MANAGER_TIMESTAMP_INITRD_GENERATORS_FINISH] = "initrd-generators-finish",
4443 [MANAGER_TIMESTAMP_INITRD_UNITS_LOAD_START] = "initrd-units-load-start",
4444 [MANAGER_TIMESTAMP_INITRD_UNITS_LOAD_FINISH] = "initrd-units-load-finish",
4445 };
4446
4447 DEFINE_STRING_TABLE_LOOKUP(manager_timestamp, ManagerTimestamp);
4448
4449 static const char* const oom_policy_table[_OOM_POLICY_MAX] = {
4450 [OOM_CONTINUE] = "continue",
4451 [OOM_STOP] = "stop",
4452 [OOM_KILL] = "kill",
4453 };
4454
4455 DEFINE_STRING_TABLE_LOOKUP(oom_policy, OOMPolicy);
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