src/login/logind.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <errno.h>
   4 #include <fcntl.h>
   5 #include <string.h>
   6 #include <unistd.h>
   7
   8 #include "sd-daemon.h"
   9 #include "sd-device.h"
  10
  11 #include "alloc-util.h"
  12 #include "bus-error.h"
  13 #include "bus-util.h"
  14 #include "cgroup-util.h"
  15 #include "def.h"
  16 #include "device-util.h"
  17 #include "dirent-util.h"
  18 #include "fd-util.h"
  19 #include "format-util.h"
  20 #include "fs-util.h"
  21 #include "libudev-private.h"
  22 #include "logind.h"
  23 #include "parse-util.h"
  24 #include "process-util.h"
  25 #include "selinux-util.h"
  26 #include "signal-util.h"
  27 #include "strv.h"
  28
  29 static Manager* manager_unref(Manager *m);
  30 DEFINE_TRIVIAL_CLEANUP_FUNC(Manager*, manager_unref);
  31
  32 static int manager_new(Manager **ret) {
  33         _cleanup_(manager_unrefp) Manager *m = NULL;
  34         int r;
  35
  36         assert(ret);
  37
  38         m = new0(Manager, 1);
  39         if (!m)
  40                 return -ENOMEM;
  41
  42         m->console_active_fd = -1;
  43         m->reserve_vt_fd = -1;
  44
  45         m->idle_action_not_before_usec = now(CLOCK_MONOTONIC);
  46
  47         m->devices = hashmap_new(&string_hash_ops);
  48         m->seats = hashmap_new(&string_hash_ops);
  49         m->sessions = hashmap_new(&string_hash_ops);
  50         m->users = hashmap_new(NULL);
  51         m->inhibitors = hashmap_new(&string_hash_ops);
  52         m->buttons = hashmap_new(&string_hash_ops);
  53
  54         m->user_units = hashmap_new(&string_hash_ops);
  55         m->session_units = hashmap_new(&string_hash_ops);
  56
  57         if (!m->devices || !m->seats || !m->sessions || !m->users || !m->inhibitors || !m->buttons || !m->user_units || !m->session_units)
  58                 return -ENOMEM;
  59
  60         r = sd_event_default(&m->event);
  61         if (r < 0)
  62                 return r;
  63
  64         r = sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
  65         if (r < 0)
  66                 return r;
  67
  68         r = sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL);
  69         if (r < 0)
  70                 return r;
  71
  72         (void) sd_event_set_watchdog(m->event, true);
  73
  74         manager_reset_config(m);
  75
  76         *ret = TAKE_PTR(m);
  77         return 0;
  78 }
  79
  80 static Manager* manager_unref(Manager *m) {
  81         Session *session;
  82         User *u;
  83         Device *d;
  84         Seat *s;
  85         Inhibitor *i;
  86         Button *b;
  87
  88         if (!m)
  89                 return NULL;
  90
  91         while ((session = hashmap_first(m->sessions)))
  92                 session_free(session);
  93
  94         while ((u = hashmap_first(m->users)))
  95                 user_free(u);
  96
  97         while ((d = hashmap_first(m->devices)))
  98                 device_free(d);
  99
 100         while ((s = hashmap_first(m->seats)))
 101                 seat_free(s);
 102
 103         while ((i = hashmap_first(m->inhibitors)))
 104                 inhibitor_free(i);
 105
 106         while ((b = hashmap_first(m->buttons)))
 107                 button_free(b);
 108
 109         hashmap_free(m->devices);
 110         hashmap_free(m->seats);
 111         hashmap_free(m->sessions);
 112         hashmap_free(m->users);
 113         hashmap_free(m->inhibitors);
 114         hashmap_free(m->buttons);
 115
 116         hashmap_free(m->user_units);
 117         hashmap_free(m->session_units);
 118
 119         sd_event_source_unref(m->idle_action_event_source);
 120         sd_event_source_unref(m->inhibit_timeout_source);
 121         sd_event_source_unref(m->scheduled_shutdown_timeout_source);
 122         sd_event_source_unref(m->nologin_timeout_source);
 123         sd_event_source_unref(m->wall_message_timeout_source);
 124
 125         sd_event_source_unref(m->console_active_event_source);
 126         sd_event_source_unref(m->udev_seat_event_source);
 127         sd_event_source_unref(m->udev_device_event_source);
 128         sd_event_source_unref(m->udev_vcsa_event_source);
 129         sd_event_source_unref(m->udev_button_event_source);
 130         sd_event_source_unref(m->lid_switch_ignore_event_source);
 131
 132         safe_close(m->console_active_fd);
 133
 134         udev_monitor_unref(m->udev_seat_monitor);
 135         udev_monitor_unref(m->udev_device_monitor);
 136         udev_monitor_unref(m->udev_vcsa_monitor);
 137         udev_monitor_unref(m->udev_button_monitor);
 138
 139         if (m->unlink_nologin)
 140                 (void) unlink_or_warn("/run/nologin");
 141
 142         bus_verify_polkit_async_registry_free(m->polkit_registry);
 143
 144         sd_bus_unref(m->bus);
 145         sd_event_unref(m->event);
 146
 147         safe_close(m->reserve_vt_fd);
 148
 149         strv_free(m->kill_only_users);
 150         strv_free(m->kill_exclude_users);
 151
 152         free(m->scheduled_shutdown_type);
 153         free(m->scheduled_shutdown_tty);
 154         free(m->wall_message);
 155         free(m->action_job);
 156
 157         return mfree(m);
 158 }
 159
 160 static int manager_enumerate_devices(Manager *m) {
 161         _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
 162         sd_device *d;
 163         int r;
 164
 165         assert(m);
 166
 167         /* Loads devices from udev and creates seats for them as
 168          * necessary */
 169
 170         r = sd_device_enumerator_new(&e);
 171         if (r < 0)
 172                 return r;
 173
 174         r = sd_device_enumerator_add_match_tag(e, "master-of-seat");
 175         if (r < 0)
 176                 return r;
 177
 178         FOREACH_DEVICE(e, d) {
 179                 int k;
 180
 181                 k = manager_process_seat_device(m, d);
 182                 if (k < 0)
 183                         r = k;
 184         }
 185
 186         return r;
 187 }
 188
 189 static int manager_enumerate_buttons(Manager *m) {
 190         _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
 191         sd_device *d;
 192         int r;
 193
 194         assert(m);
 195
 196         /* Loads buttons from udev */
 197
 198         if (manager_all_buttons_ignored(m))
 199                 return 0;
 200
 201         r = sd_device_enumerator_new(&e);
 202         if (r < 0)
 203                 return r;
 204
 205         r = sd_device_enumerator_add_match_subsystem(e, "input", true);
 206         if (r < 0)
 207                 return r;
 208
 209         r = sd_device_enumerator_add_match_tag(e, "power-switch");
 210         if (r < 0)
 211                 return r;
 212
 213         FOREACH_DEVICE(e, d) {
 214                 int k;
 215
 216                 k = manager_process_button_device(m, d);
 217                 if (k < 0)
 218                         r = k;
 219         }
 220
 221         return r;
 222 }
 223
 224 static int manager_enumerate_seats(Manager *m) {
 225         _cleanup_closedir_ DIR *d = NULL;
 226         struct dirent *de;
 227         int r = 0;
 228
 229         assert(m);
 230
 231         /* This loads data about seats stored on disk, but does not
 232          * actually create any seats. Removes data of seats that no
 233          * longer exist. */
 234
 235         d = opendir("/run/systemd/seats");
 236         if (!d) {
 237                 if (errno == ENOENT)
 238                         return 0;
 239
 240                 return log_error_errno(errno, "Failed to open /run/systemd/seats: %m");
 241         }
 242
 243         FOREACH_DIRENT(de, d, return -errno) {
 244                 Seat *s;
 245                 int k;
 246
 247                 if (!dirent_is_file(de))
 248                         continue;
 249
 250                 s = hashmap_get(m->seats, de->d_name);
 251                 if (!s) {
 252                         if (unlinkat(dirfd(d), de->d_name, 0) < 0)
 253                                 log_warning("Failed to remove /run/systemd/seats/%s: %m",
 254                                             de->d_name);
 255                         continue;
 256                 }
 257
 258                 k = seat_load(s);
 259                 if (k < 0)
 260                         r = k;
 261         }
 262
 263         return r;
 264 }
 265
 266 static int manager_enumerate_linger_users(Manager *m) {
 267         _cleanup_closedir_ DIR *d = NULL;
 268         struct dirent *de;
 269         int r = 0;
 270
 271         assert(m);
 272
 273         d = opendir("/var/lib/systemd/linger");
 274         if (!d) {
 275                 if (errno == ENOENT)
 276                         return 0;
 277
 278                 return log_error_errno(errno, "Failed to open /var/lib/systemd/linger/: %m");
 279         }
 280
 281         FOREACH_DIRENT(de, d, return -errno) {
 282                 int k;
 283
 284                 if (!dirent_is_file(de))
 285                         continue;
 286
 287                 k = manager_add_user_by_name(m, de->d_name, NULL);
 288                 if (k < 0) {
 289                         log_notice_errno(k, "Couldn't add lingering user %s: %m", de->d_name);
 290                         r = k;
 291                 }
 292         }
 293
 294         return r;
 295 }
 296
 297 static int manager_enumerate_users(Manager *m) {
 298         _cleanup_closedir_ DIR *d = NULL;
 299         struct dirent *de;
 300         int r, k;
 301
 302         assert(m);
 303
 304         /* Add lingering users */
 305         r = manager_enumerate_linger_users(m);
 306
 307         /* Read in user data stored on disk */
 308         d = opendir("/run/systemd/users");
 309         if (!d) {
 310                 if (errno == ENOENT)
 311                         return 0;
 312
 313                 return log_error_errno(errno, "Failed to open /run/systemd/users: %m");
 314         }
 315
 316         FOREACH_DIRENT(de, d, return -errno) {
 317                 User *u;
 318
 319                 if (!dirent_is_file(de))
 320                         continue;
 321
 322                 k = manager_add_user_by_name(m, de->d_name, &u);
 323                 if (k < 0) {
 324                         log_error_errno(k, "Failed to add user by file name %s: %m", de->d_name);
 325
 326                         r = k;
 327                         continue;
 328                 }
 329
 330                 user_add_to_gc_queue(u);
 331
 332                 k = user_load(u);
 333                 if (k < 0)
 334                         r = k;
 335         }
 336
 337         return r;
 338 }
 339
 340 static int parse_fdname(const char *fdname, char **session_id, dev_t *dev) {
 341         _cleanup_strv_free_ char **parts = NULL;
 342         _cleanup_free_ char *id = NULL;
 343         unsigned int major, minor;
 344         int r;
 345
 346         parts = strv_split(fdname, "-");
 347         if (!parts)
 348                 return -ENOMEM;
 349         if (strv_length(parts) != 5)
 350                 return -EINVAL;
 351
 352         if (!streq(parts[0], "session"))
 353                 return -EINVAL;
 354
 355         id = strdup(parts[1]);
 356         if (!id)
 357                 return -ENOMEM;
 358
 359         if (!streq(parts[2], "device"))
 360                 return -EINVAL;
 361
 362         r = safe_atou(parts[3], &major);
 363         if (r < 0)
 364                 return r;
 365         r = safe_atou(parts[4], &minor);
 366         if (r < 0)
 367                 return r;
 368
 369         *dev = makedev(major, minor);
 370         *session_id = TAKE_PTR(id);
 371
 372         return 0;
 373 }
 374
 375 static int manager_attach_fds(Manager *m) {
 376         _cleanup_strv_free_ char **fdnames = NULL;
 377         int n, i, fd;
 378
 379         /* Upon restart, PID1 will send us back all fds of session devices
 380          * that we previously opened. Each file descriptor is associated
 381          * with a given session. The session ids are passed through FDNAMES. */
 382
 383         n = sd_listen_fds_with_names(true, &fdnames);
 384         if (n <= 0)
 385                 return n;
 386
 387         for (i = 0; i < n; i++) {
 388                 _cleanup_free_ char *id = NULL;
 389                 dev_t dev;
 390                 struct stat st;
 391                 SessionDevice *sd;
 392                 Session *s;
 393                 int r;
 394
 395                 fd = SD_LISTEN_FDS_START + i;
 396
 397                 r = parse_fdname(fdnames[i], &id, &dev);
 398                 if (r < 0) {
 399                         log_debug_errno(r, "Failed to parse fd name %s: %m", fdnames[i]);
 400                         close_nointr(fd);
 401                         continue;
 402                 }
 403
 404                 s = hashmap_get(m->sessions, id);
 405                 if (!s) {
 406                         /* If the session doesn't exist anymore, the associated session
 407                          * device attached to this fd doesn't either. Let's simply close
 408                          * this fd. */
 409                         log_debug("Failed to attach fd for unknown session: %s", id);
 410                         close_nointr(fd);
 411                         continue;
 412                 }
 413
 414                 if (fstat(fd, &st) < 0) {
 415                         /* The device is allowed to go away at a random point, in which
 416                          * case fstat failing is expected. */
 417                         log_debug_errno(errno, "Failed to stat device fd for session %s: %m", id);
 418                         close_nointr(fd);
 419                         continue;
 420                 }
 421
 422                 if (!S_ISCHR(st.st_mode) || st.st_rdev != dev) {
 423                         log_debug("Device fd doesn't point to the expected character device node");
 424                         close_nointr(fd);
 425                         continue;
 426                 }
 427
 428                 sd = hashmap_get(s->devices, &dev);
 429                 if (!sd) {
 430                         /* Weird, we got an fd for a session device which wasn't
 431                          * recorded in the session state file... */
 432                         log_warning("Got fd for missing session device [%u:%u] in session %s",
 433                                     major(dev), minor(dev), s->id);
 434                         close_nointr(fd);
 435                         continue;
 436                 }
 437
 438                 log_debug("Attaching fd to session device [%u:%u] for session %s",
 439                           major(dev), minor(dev), s->id);
 440
 441                 session_device_attach_fd(sd, fd, s->was_active);
 442         }
 443
 444         return 0;
 445 }
 446
 447 static int manager_enumerate_sessions(Manager *m) {
 448         _cleanup_closedir_ DIR *d = NULL;
 449         struct dirent *de;
 450         int r = 0, k;
 451
 452         assert(m);
 453
 454         /* Read in session data stored on disk */
 455         d = opendir("/run/systemd/sessions");
 456         if (!d) {
 457                 if (errno == ENOENT)
 458                         return 0;
 459
 460                 return log_error_errno(errno, "Failed to open /run/systemd/sessions: %m");
 461         }
 462
 463         FOREACH_DIRENT(de, d, return -errno) {
 464                 struct Session *s;
 465
 466                 if (!dirent_is_file(de))
 467                         continue;
 468
 469                 if (!session_id_valid(de->d_name)) {
 470                         log_warning("Invalid session file name '%s', ignoring.", de->d_name);
 471                         r = -EINVAL;
 472                         continue;
 473                 }
 474
 475                 k = manager_add_session(m, de->d_name, &s);
 476                 if (k < 0) {
 477                         log_error_errno(k, "Failed to add session by file name %s: %m", de->d_name);
 478                         r = k;
 479                         continue;
 480                 }
 481
 482                 session_add_to_gc_queue(s);
 483
 484                 k = session_load(s);
 485                 if (k < 0)
 486                         r = k;
 487         }
 488
 489         /* We might be restarted and PID1 could have sent us back the
 490          * session device fds we previously saved. */
 491         k = manager_attach_fds(m);
 492         if (k < 0)
 493                 log_warning_errno(k, "Failed to reattach session device fds: %m");
 494
 495         return r;
 496 }
 497
 498 static int manager_enumerate_inhibitors(Manager *m) {
 499         _cleanup_closedir_ DIR *d = NULL;
 500         struct dirent *de;
 501         int r = 0;
 502
 503         assert(m);
 504
 505         d = opendir("/run/systemd/inhibit");
 506         if (!d) {
 507                 if (errno == ENOENT)
 508                         return 0;
 509
 510                 return log_error_errno(errno, "Failed to open /run/systemd/inhibit: %m");
 511         }
 512
 513         FOREACH_DIRENT(de, d, return -errno) {
 514                 int k;
 515                 Inhibitor *i;
 516
 517                 if (!dirent_is_file(de))
 518                         continue;
 519
 520                 k = manager_add_inhibitor(m, de->d_name, &i);
 521                 if (k < 0) {
 522                         log_notice_errno(k, "Couldn't add inhibitor %s: %m", de->d_name);
 523                         r = k;
 524                         continue;
 525                 }
 526
 527                 k = inhibitor_load(i);
 528                 if (k < 0)
 529                         r = k;
 530         }
 531
 532         return r;
 533 }
 534
 535 static int manager_dispatch_seat_udev(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 536         _cleanup_(sd_device_unrefp) sd_device *d = NULL;
 537         Manager *m = userdata;
 538         int r;
 539
 540         assert(m);
 541
 542         r = udev_monitor_receive_sd_device(m->udev_seat_monitor, &d);
 543         if (r < 0)
 544                 return r;
 545
 546         manager_process_seat_device(m, d);
 547         return 0;
 548 }
 549
 550 static int manager_dispatch_device_udev(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 551         _cleanup_(sd_device_unrefp) sd_device *d = NULL;
 552         Manager *m = userdata;
 553         int r;
 554
 555         assert(m);
 556
 557         r = udev_monitor_receive_sd_device(m->udev_device_monitor, &d);
 558         if (r < 0)
 559                 return r;
 560
 561         manager_process_seat_device(m, d);
 562         return 0;
 563 }
 564
 565 static int manager_dispatch_vcsa_udev(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 566         _cleanup_(sd_device_unrefp) sd_device *d = NULL;
 567         Manager *m = userdata;
 568         const char *name, *action;
 569         int r;
 570
 571         assert(m);
 572
 573         r = udev_monitor_receive_sd_device(m->udev_vcsa_monitor, &d);
 574         if (r < 0)
 575                 return r;
 576
 577         /* Whenever a VCSA device is removed try to reallocate our
 578          * VTs, to make sure our auto VTs never go away. */
 579
 580         if (sd_device_get_sysname(d, &name) >= 0 &&
 581             startswith(name, "vcsa") &&
 582             sd_device_get_property_value(d, "ACTION", &action) >= 0 &&
 583             streq(action, "remove"))
 584                 seat_preallocate_vts(m->seat0);
 585
 586         return 0;
 587 }
 588
 589 static int manager_dispatch_button_udev(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 590         _cleanup_(sd_device_unrefp) sd_device *d = NULL;
 591         Manager *m = userdata;
 592         int r;
 593
 594         assert(m);
 595
 596         r = udev_monitor_receive_sd_device(m->udev_button_monitor, &d);
 597         if (r < 0)
 598                 return r;
 599
 600         manager_process_button_device(m, d);
 601         return 0;
 602 }
 603
 604 static int manager_dispatch_console(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 605         Manager *m = userdata;
 606
 607         assert(m);
 608         assert(m->seat0);
 609         assert(m->console_active_fd == fd);
 610
 611         seat_read_active_vt(m->seat0);
 612         return 0;
 613 }
 614
 615 static int manager_reserve_vt(Manager *m) {
 616         _cleanup_free_ char *p = NULL;
 617
 618         assert(m);
 619
 620         if (m->reserve_vt <= 0)
 621                 return 0;
 622
 623         if (asprintf(&p, "/dev/tty%u", m->reserve_vt) < 0)
 624                 return log_oom();
 625
 626         m->reserve_vt_fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
 627         if (m->reserve_vt_fd < 0) {
 628
 629                 /* Don't complain on VT-less systems */
 630                 if (errno != ENOENT)
 631                         log_warning_errno(errno, "Failed to pin reserved VT: %m");
 632                 return -errno;
 633         }
 634
 635         return 0;
 636 }
 637
 638 static int manager_connect_bus(Manager *m) {
 639         int r;
 640
 641         assert(m);
 642         assert(!m->bus);
 643
 644         r = sd_bus_default_system(&m->bus);
 645         if (r < 0)
 646                 return log_error_errno(r, "Failed to connect to system bus: %m");
 647
 648         r = sd_bus_add_object_vtable(m->bus, NULL, "/org/freedesktop/login1", "org.freedesktop.login1.Manager", manager_vtable, m);
 649         if (r < 0)
 650                 return log_error_errno(r, "Failed to add manager object vtable: %m");
 651
 652         r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/login1/seat", "org.freedesktop.login1.Seat", seat_vtable, seat_object_find, m);
 653         if (r < 0)
 654                 return log_error_errno(r, "Failed to add seat object vtable: %m");
 655
 656         r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/login1/seat", seat_node_enumerator, m);
 657         if (r < 0)
 658                 return log_error_errno(r, "Failed to add seat enumerator: %m");
 659
 660         r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/login1/session", "org.freedesktop.login1.Session", session_vtable, session_object_find, m);
 661         if (r < 0)
 662                 return log_error_errno(r, "Failed to add session object vtable: %m");
 663
 664         r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/login1/session", session_node_enumerator, m);
 665         if (r < 0)
 666                 return log_error_errno(r, "Failed to add session enumerator: %m");
 667
 668         r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/login1/user", "org.freedesktop.login1.User", user_vtable, user_object_find, m);
 669         if (r < 0)
 670                 return log_error_errno(r, "Failed to add user object vtable: %m");
 671
 672         r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/login1/user", user_node_enumerator, m);
 673         if (r < 0)
 674                 return log_error_errno(r, "Failed to add user enumerator: %m");
 675
 676         r = sd_bus_match_signal_async(
 677                         m->bus,
 678                         NULL,
 679                         "org.freedesktop.systemd1",
 680                         "/org/freedesktop/systemd1",
 681                         "org.freedesktop.systemd1.Manager",
 682                         "JobRemoved",
 683                         match_job_removed, NULL, m);
 684         if (r < 0)
 685                 return log_error_errno(r, "Failed to request match for JobRemoved: %m");
 686
 687         r = sd_bus_match_signal_async(
 688                         m->bus,
 689                         NULL,
 690                         "org.freedesktop.systemd1",
 691                         "/org/freedesktop/systemd1",
 692                         "org.freedesktop.systemd1.Manager",
 693                         "UnitRemoved",
 694                         match_unit_removed, NULL, m);
 695         if (r < 0)
 696                 return log_error_errno(r, "Failed to request match for UnitRemoved: %m");
 697
 698         r = sd_bus_match_signal_async(
 699                         m->bus,
 700                         NULL,
 701                         "org.freedesktop.systemd1",
 702                         NULL,
 703                         "org.freedesktop.DBus.Properties",
 704                         "PropertiesChanged",
 705                         match_properties_changed, NULL, m);
 706         if (r < 0)
 707                 return log_error_errno(r, "Failed to request match for PropertiesChanged: %m");
 708
 709         r = sd_bus_match_signal_async(
 710                         m->bus,
 711                         NULL,
 712                         "org.freedesktop.systemd1",
 713                         "/org/freedesktop/systemd1",
 714                         "org.freedesktop.systemd1.Manager",
 715                         "Reloading",
 716                         match_reloading, NULL, m);
 717         if (r < 0)
 718                 return log_error_errno(r, "Failed to request match for Reloading: %m");
 719
 720         r = sd_bus_call_method_async(
 721                         m->bus,
 722                         NULL,
 723                         "org.freedesktop.systemd1",
 724                         "/org/freedesktop/systemd1",
 725                         "org.freedesktop.systemd1.Manager",
 726                         "Subscribe",
 727                         NULL, NULL,
 728                         NULL);
 729         if (r < 0)
 730                 return log_error_errno(r, "Failed to enable subscription: %m");
 731
 732         r = sd_bus_request_name_async(m->bus, NULL, "org.freedesktop.login1", 0, NULL, NULL);
 733         if (r < 0)
 734                 return log_error_errno(r, "Failed to request name: %m");
 735
 736         r = sd_bus_attach_event(m->bus, m->event, SD_EVENT_PRIORITY_NORMAL);
 737         if (r < 0)
 738                 return log_error_errno(r, "Failed to attach bus to event loop: %m");
 739
 740         return 0;
 741 }
 742
 743 static int manager_vt_switch(sd_event_source *src, const struct signalfd_siginfo *si, void *data) {
 744         Manager *m = data;
 745         Session *active, *iter;
 746
 747         /*
 748          * We got a VT-switch signal and we have to acknowledge it immediately.
 749          * Preferably, we'd just use m->seat0->active->vtfd, but unfortunately,
 750          * old user-space might run multiple sessions on a single VT, *sigh*.
 751          * Therefore, we have to iterate all sessions and find one with a vtfd
 752          * on the requested VT.
 753          * As only VTs with active controllers have VT_PROCESS set, our current
 754          * notion of the active VT might be wrong (for instance if the switch
 755          * happens while we setup VT_PROCESS). Therefore, read the current VT
 756          * first and then use s->active->vtnr as reference. Note that this is
 757          * not racy, as no further VT-switch can happen as long as we're in
 758          * synchronous VT_PROCESS mode.
 759          */
 760
 761         assert(m->seat0);
 762         seat_read_active_vt(m->seat0);
 763
 764         active = m->seat0->active;
 765         if (!active || active->vtnr < 1) {
 766                 log_warning("Received VT_PROCESS signal without a registered session on that VT.");
 767                 return 0;
 768         }
 769
 770         if (active->vtfd >= 0) {
 771                 session_leave_vt(active);
 772         } else {
 773                 LIST_FOREACH(sessions_by_seat, iter, m->seat0->sessions) {
 774                         if (iter->vtnr == active->vtnr && iter->vtfd >= 0) {
 775                                 session_leave_vt(iter);
 776                                 break;
 777                         }
 778                 }
 779         }
 780
 781         return 0;
 782 }
 783
 784 static int manager_connect_console(Manager *m) {
 785         int r;
 786
 787         assert(m);
 788         assert(m->console_active_fd < 0);
 789
 790         /* On certain architectures (S390 and Xen, and containers),
 791            /dev/tty0 does not exist, so don't fail if we can't open
 792            it. */
 793         if (access("/dev/tty0", F_OK) < 0)
 794                 return 0;
 795
 796         m->console_active_fd = open("/sys/class/tty/tty0/active", O_RDONLY|O_NOCTTY|O_CLOEXEC);
 797         if (m->console_active_fd < 0) {
 798
 799                 /* On some systems the device node /dev/tty0 may exist
 800                  * even though /sys/class/tty/tty0 does not. */
 801                 if (errno == ENOENT)
 802                         return 0;
 803
 804                 return log_error_errno(errno, "Failed to open /sys/class/tty/tty0/active: %m");
 805         }
 806
 807         r = sd_event_add_io(m->event, &m->console_active_event_source, m->console_active_fd, 0, manager_dispatch_console, m);
 808         if (r < 0) {
 809                 log_error("Failed to watch foreground console");
 810                 return r;
 811         }
 812
 813         /*
 814          * SIGRTMIN is used as global VT-release signal, SIGRTMIN + 1 is used
 815          * as VT-acquire signal. We ignore any acquire-events (yes, we still
 816          * have to provide a valid signal-number for it!) and acknowledge all
 817          * release events immediately.
 818          */
 819
 820         if (SIGRTMIN + 1 > SIGRTMAX) {
 821                 log_error("Not enough real-time signals available: %u-%u", SIGRTMIN, SIGRTMAX);
 822                 return -EINVAL;
 823         }
 824
 825         assert_se(ignore_signals(SIGRTMIN + 1, -1) >= 0);
 826         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGRTMIN, -1) >= 0);
 827
 828         r = sd_event_add_signal(m->event, NULL, SIGRTMIN, manager_vt_switch, m);
 829         if (r < 0)
 830                 return r;
 831
 832         return 0;
 833 }
 834
 835 static int manager_connect_udev(Manager *m) {
 836         int r;
 837
 838         assert(m);
 839         assert(!m->udev_seat_monitor);
 840         assert(!m->udev_device_monitor);
 841         assert(!m->udev_vcsa_monitor);
 842         assert(!m->udev_button_monitor);
 843
 844         m->udev_seat_monitor = udev_monitor_new_from_netlink(NULL, "udev");
 845         if (!m->udev_seat_monitor)
 846                 return -ENOMEM;
 847
 848         r = udev_monitor_filter_add_match_tag(m->udev_seat_monitor, "master-of-seat");
 849         if (r < 0)
 850                 return r;
 851
 852         r = udev_monitor_enable_receiving(m->udev_seat_monitor);
 853         if (r < 0)
 854                 return r;
 855
 856         r = sd_event_add_io(m->event, &m->udev_seat_event_source, udev_monitor_get_fd(m->udev_seat_monitor), EPOLLIN, manager_dispatch_seat_udev, m);
 857         if (r < 0)
 858                 return r;
 859
 860         m->udev_device_monitor = udev_monitor_new_from_netlink(NULL, "udev");
 861         if (!m->udev_device_monitor)
 862                 return -ENOMEM;
 863
 864         r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_device_monitor, "input", NULL);
 865         if (r < 0)
 866                 return r;
 867
 868         r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_device_monitor, "graphics", NULL);
 869         if (r < 0)
 870                 return r;
 871
 872         r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_device_monitor, "drm", NULL);
 873         if (r < 0)
 874                 return r;
 875
 876         r = udev_monitor_enable_receiving(m->udev_device_monitor);
 877         if (r < 0)
 878                 return r;
 879
 880         r = sd_event_add_io(m->event, &m->udev_device_event_source, udev_monitor_get_fd(m->udev_device_monitor), EPOLLIN, manager_dispatch_device_udev, m);
 881         if (r < 0)
 882                 return r;
 883
 884         /* Don't watch keys if nobody cares */
 885         if (!manager_all_buttons_ignored(m)) {
 886                 m->udev_button_monitor = udev_monitor_new_from_netlink(NULL, "udev");
 887                 if (!m->udev_button_monitor)
 888                         return -ENOMEM;
 889
 890                 r = udev_monitor_filter_add_match_tag(m->udev_button_monitor, "power-switch");
 891                 if (r < 0)
 892                         return r;
 893
 894                 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_button_monitor, "input", NULL);
 895                 if (r < 0)
 896                         return r;
 897
 898                 r = udev_monitor_enable_receiving(m->udev_button_monitor);
 899                 if (r < 0)
 900                         return r;
 901
 902                 r = sd_event_add_io(m->event, &m->udev_button_event_source, udev_monitor_get_fd(m->udev_button_monitor), EPOLLIN, manager_dispatch_button_udev, m);
 903                 if (r < 0)
 904                         return r;
 905         }
 906
 907         /* Don't bother watching VCSA devices, if nobody cares */
 908         if (m->n_autovts > 0 && m->console_active_fd >= 0) {
 909
 910                 m->udev_vcsa_monitor = udev_monitor_new_from_netlink(NULL, "udev");
 911                 if (!m->udev_vcsa_monitor)
 912                         return -ENOMEM;
 913
 914                 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_vcsa_monitor, "vc", NULL);
 915                 if (r < 0)
 916                         return r;
 917
 918                 r = udev_monitor_enable_receiving(m->udev_vcsa_monitor);
 919                 if (r < 0)
 920                         return r;
 921
 922                 r = sd_event_add_io(m->event, &m->udev_vcsa_event_source, udev_monitor_get_fd(m->udev_vcsa_monitor), EPOLLIN, manager_dispatch_vcsa_udev, m);
 923                 if (r < 0)
 924                         return r;
 925         }
 926
 927         return 0;
 928 }
 929
 930 static void manager_gc(Manager *m, bool drop_not_started) {
 931         Seat *seat;
 932         Session *session;
 933         User *user;
 934
 935         assert(m);
 936
 937         while ((seat = m->seat_gc_queue)) {
 938                 LIST_REMOVE(gc_queue, m->seat_gc_queue, seat);
 939                 seat->in_gc_queue = false;
 940
 941                 if (seat_may_gc(seat, drop_not_started)) {
 942                         seat_stop(seat, false);
 943                         seat_free(seat);
 944                 }
 945         }
 946
 947         while ((session = m->session_gc_queue)) {
 948                 LIST_REMOVE(gc_queue, m->session_gc_queue, session);
 949                 session->in_gc_queue = false;
 950
 951                 /* First, if we are not closing yet, initiate stopping */
 952                 if (session_may_gc(session, drop_not_started) &&
 953                     session_get_state(session) != SESSION_CLOSING)
 954                         session_stop(session, false);
 955
 956                 /* Normally, this should make the session referenced
 957                  * again, if it doesn't then let's get rid of it
 958                  * immediately */
 959                 if (session_may_gc(session, drop_not_started)) {
 960                         session_finalize(session);
 961                         session_free(session);
 962                 }
 963         }
 964
 965         while ((user = m->user_gc_queue)) {
 966                 LIST_REMOVE(gc_queue, m->user_gc_queue, user);
 967                 user->in_gc_queue = false;
 968
 969                 /* First step: queue stop jobs */
 970                 if (user_may_gc(user, drop_not_started))
 971                         user_stop(user, false);
 972
 973                 /* Second step: finalize user */
 974                 if (user_may_gc(user, drop_not_started)) {
 975                         user_finalize(user);
 976                         user_free(user);
 977                 }
 978         }
 979 }
 980
 981 static int manager_dispatch_idle_action(sd_event_source *s, uint64_t t, void *userdata) {
 982         Manager *m = userdata;
 983         struct dual_timestamp since;
 984         usec_t n, elapse;
 985         int r;
 986
 987         assert(m);
 988
 989         if (m->idle_action == HANDLE_IGNORE ||
 990             m->idle_action_usec <= 0)
 991                 return 0;
 992
 993         n = now(CLOCK_MONOTONIC);
 994
 995         r = manager_get_idle_hint(m, &since);
 996         if (r <= 0)
 997                 /* Not idle. Let's check if after a timeout it might be idle then. */
 998                 elapse = n + m->idle_action_usec;
 999         else {
1000                 /* Idle! Let's see if it's time to do something, or if
1001                  * we shall sleep for longer. */
1002
1003                 if (n >= since.monotonic + m->idle_action_usec &&
1004                     (m->idle_action_not_before_usec <= 0 || n >= m->idle_action_not_before_usec + m->idle_action_usec)) {
1005                         log_info("System idle. Taking action.");
1006
1007                         manager_handle_action(m, 0, m->idle_action, false, false);
1008                         m->idle_action_not_before_usec = n;
1009                 }
1010
1011                 elapse = MAX(since.monotonic, m->idle_action_not_before_usec) + m->idle_action_usec;
1012         }
1013
1014         if (!m->idle_action_event_source) {
1015
1016                 r = sd_event_add_time(
1017                                 m->event,
1018                                 &m->idle_action_event_source,
1019                                 CLOCK_MONOTONIC,
1020                                 elapse, USEC_PER_SEC*30,
1021                                 manager_dispatch_idle_action, m);
1022                 if (r < 0)
1023                         return log_error_errno(r, "Failed to add idle event source: %m");
1024
1025                 r = sd_event_source_set_priority(m->idle_action_event_source, SD_EVENT_PRIORITY_IDLE+10);
1026                 if (r < 0)
1027                         return log_error_errno(r, "Failed to set idle event source priority: %m");
1028         } else {
1029                 r = sd_event_source_set_time(m->idle_action_event_source, elapse);
1030                 if (r < 0)
1031                         return log_error_errno(r, "Failed to set idle event timer: %m");
1032
1033                 r = sd_event_source_set_enabled(m->idle_action_event_source, SD_EVENT_ONESHOT);
1034                 if (r < 0)
1035                         return log_error_errno(r, "Failed to enable idle event timer: %m");
1036         }
1037
1038         return 0;
1039 }
1040
1041 static int manager_dispatch_reload_signal(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
1042         Manager *m = userdata;
1043         int r;
1044
1045         manager_reset_config(m);
1046         r = manager_parse_config_file(m);
1047         if (r < 0)
1048                 log_warning_errno(r, "Failed to parse config file, using defaults: %m");
1049         else
1050                 log_info("Config file reloaded.");
1051
1052         return 0;
1053 }
1054
1055 static int manager_startup(Manager *m) {
1056         int r;
1057         Seat *seat;
1058         Session *session;
1059         User *user;
1060         Button *button;
1061         Inhibitor *inhibitor;
1062         Iterator i;
1063
1064         assert(m);
1065
1066         r = sd_event_add_signal(m->event, NULL, SIGHUP, manager_dispatch_reload_signal, m);
1067         if (r < 0)
1068                 return log_error_errno(r, "Failed to register SIGHUP handler: %m");
1069
1070         /* Connect to console */
1071         r = manager_connect_console(m);
1072         if (r < 0)
1073                 return r;
1074
1075         /* Connect to udev */
1076         r = manager_connect_udev(m);
1077         if (r < 0)
1078                 return log_error_errno(r, "Failed to create udev watchers: %m");
1079
1080         /* Connect to the bus */
1081         r = manager_connect_bus(m);
1082         if (r < 0)
1083                 return r;
1084
1085         /* Instantiate magic seat 0 */
1086         r = manager_add_seat(m, "seat0", &m->seat0);
1087         if (r < 0)
1088                 return log_error_errno(r, "Failed to add seat0: %m");
1089
1090         r = manager_set_lid_switch_ignore(m, 0 + m->holdoff_timeout_usec);
1091         if (r < 0)
1092                 log_warning_errno(r, "Failed to set up lid switch ignore event source: %m");
1093
1094         /* Deserialize state */
1095         r = manager_enumerate_devices(m);
1096         if (r < 0)
1097                 log_warning_errno(r, "Device enumeration failed: %m");
1098
1099         r = manager_enumerate_seats(m);
1100         if (r < 0)
1101                 log_warning_errno(r, "Seat enumeration failed: %m");
1102
1103         r = manager_enumerate_users(m);
1104         if (r < 0)
1105                 log_warning_errno(r, "User enumeration failed: %m");
1106
1107         r = manager_enumerate_sessions(m);
1108         if (r < 0)
1109                 log_warning_errno(r, "Session enumeration failed: %m");
1110
1111         r = manager_enumerate_inhibitors(m);
1112         if (r < 0)
1113                 log_warning_errno(r, "Inhibitor enumeration failed: %m");
1114
1115         r = manager_enumerate_buttons(m);
1116         if (r < 0)
1117                 log_warning_errno(r, "Button enumeration failed: %m");
1118
1119         /* Remove stale objects before we start them */
1120         manager_gc(m, false);
1121
1122         /* Reserve the special reserved VT */
1123         manager_reserve_vt(m);
1124
1125         /* And start everything */
1126         HASHMAP_FOREACH(seat, m->seats, i)
1127                 seat_start(seat);
1128
1129         HASHMAP_FOREACH(user, m->users, i)
1130                 user_start(user);
1131
1132         HASHMAP_FOREACH(session, m->sessions, i)
1133                 session_start(session, NULL);
1134
1135         HASHMAP_FOREACH(inhibitor, m->inhibitors, i)
1136                 inhibitor_start(inhibitor);
1137
1138         HASHMAP_FOREACH(button, m->buttons, i)
1139                 button_check_switches(button);
1140
1141         manager_dispatch_idle_action(NULL, 0, m);
1142
1143         return 0;
1144 }
1145
1146 static int manager_run(Manager *m) {
1147         int r;
1148
1149         assert(m);
1150
1151         for (;;) {
1152                 r = sd_event_get_state(m->event);
1153                 if (r < 0)
1154                         return r;
1155                 if (r == SD_EVENT_FINISHED)
1156                         return 0;
1157
1158                 manager_gc(m, true);
1159
1160                 r = manager_dispatch_delayed(m, false);
1161                 if (r < 0)
1162                         return r;
1163                 if (r > 0)
1164                         continue;
1165
1166                 r = sd_event_run(m->event, (uint64_t) -1);
1167                 if (r < 0)
1168                         return r;
1169         }
1170 }
1171
1172 int main(int argc, char *argv[]) {
1173         _cleanup_(manager_unrefp) Manager *m = NULL;
1174         int r;
1175
1176         log_set_target(LOG_TARGET_AUTO);
1177         log_set_facility(LOG_AUTH);
1178         log_parse_environment();
1179         log_open();
1180
1181         umask(0022);
1182
1183         if (argc != 1) {
1184                 log_error("This program takes no arguments.");
1185                 r = -EINVAL;
1186                 goto finish;
1187         }
1188
1189         r = mac_selinux_init();
1190         if (r < 0) {
1191                 log_error_errno(r, "Could not initialize labelling: %m");
1192                 goto finish;
1193         }
1194
1195         /* Always create the directories people can create inotify watches in. Note that some applications might check
1196          * for the existence of /run/systemd/seats/ to determine whether logind is available, so please always make
1197          * sure these directories are created early on and unconditionally. */
1198         (void) mkdir_label("/run/systemd/seats", 0755);
1199         (void) mkdir_label("/run/systemd/users", 0755);
1200         (void) mkdir_label("/run/systemd/sessions", 0755);
1201
1202         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGHUP, SIGTERM, SIGINT, -1) >= 0);
1203
1204         r = manager_new(&m);
1205         if (r < 0) {
1206                 log_error_errno(r, "Failed to allocate manager object: %m");
1207                 goto finish;
1208         }
1209
1210         (void) manager_parse_config_file(m);
1211
1212         r = manager_startup(m);
1213         if (r < 0) {
1214                 log_error_errno(r, "Failed to fully start up daemon: %m");
1215                 goto finish;
1216         }
1217
1218         log_debug("systemd-logind running as pid "PID_FMT, getpid_cached());
1219
1220         (void) sd_notify(false,
1221                          "READY=1\n"
1222                          "STATUS=Processing requests...");
1223
1224         r = manager_run(m);
1225
1226         log_debug("systemd-logind stopped as pid "PID_FMT, getpid_cached());
1227
1228         (void) sd_notify(false,
1229                          "STOPPING=1\n"
1230                          "STATUS=Shutting down...");
1231
1232 finish:
1233         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
1234 }