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