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