src/login/logind.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3   This file is part of systemd.
   4
   5   Copyright 2011 Lennart Poettering
   6 ***/
   7
   8 #include <errno.h>
   9 #include <fcntl.h>
  10 #include <string.h>
  11 #include <unistd.h>
  12
  13 #include "libudev.h"
  14 #include "sd-daemon.h"
  15
  16 #include "alloc-util.h"
  17 #include "bus-error.h"
  18 #include "bus-util.h"
  19 #include "cgroup-util.h"
  20 #include "conf-parser.h"
  21 #include "def.h"
  22 #include "dirent-util.h"
  23 #include "fd-util.h"
  24 #include "format-util.h"
  25 #include "fs-util.h"
  26 #include "logind.h"
  27 #include "parse-util.h"
  28 #include "process-util.h"
  29 #include "selinux-util.h"
  30 #include "signal-util.h"
  31 #include "strv.h"
  32 #include "udev-util.h"
  33
  34 static void manager_free(Manager *m);
  35
  36 static Manager *manager_new(void) {
  37         Manager *m;
  38         int r;
  39
  40         m = new0(Manager, 1);
  41         if (!m)
  42                 return NULL;
  43
  44         m->console_active_fd = -1;
  45         m->reserve_vt_fd = -1;
  46
  47         m->idle_action_not_before_usec = now(CLOCK_MONOTONIC);
  48
  49         m->devices = hashmap_new(&string_hash_ops);
  50         m->seats = hashmap_new(&string_hash_ops);
  51         m->sessions = hashmap_new(&string_hash_ops);
  52         m->users = hashmap_new(NULL);
  53         m->inhibitors = hashmap_new(&string_hash_ops);
  54         m->buttons = hashmap_new(&string_hash_ops);
  55
  56         m->user_units = hashmap_new(&string_hash_ops);
  57         m->session_units = hashmap_new(&string_hash_ops);
  58
  59         if (!m->devices || !m->seats || !m->sessions || !m->users || !m->inhibitors || !m->buttons || !m->user_units || !m->session_units)
  60                 goto fail;
  61
  62         m->udev = udev_new();
  63         if (!m->udev)
  64                 goto fail;
  65
  66         r = sd_event_default(&m->event);
  67         if (r < 0)
  68                 goto fail;
  69
  70         sd_event_set_watchdog(m->event, true);
  71
  72         manager_reset_config(m);
  73
  74         return m;
  75
  76 fail:
  77         manager_free(m);
  78         return NULL;
  79 }
  80
  81 static void manager_free(Manager *m) {
  82         Session *session;
  83         User *u;
  84         Device *d;
  85         Seat *s;
  86         Inhibitor *i;
  87         Button *b;
  88
  89         if (!m)
  90                 return;
  91
  92         while ((session = hashmap_first(m->sessions)))
  93                 session_free(session);
  94
  95         while ((u = hashmap_first(m->users)))
  96                 user_free(u);
  97
  98         while ((d = hashmap_first(m->devices)))
  99                 device_free(d);
 100
 101         while ((s = hashmap_first(m->seats)))
 102                 seat_free(s);
 103
 104         while ((i = hashmap_first(m->inhibitors)))
 105                 inhibitor_free(i);
 106
 107         while ((b = hashmap_first(m->buttons)))
 108                 button_free(b);
 109
 110         hashmap_free(m->devices);
 111         hashmap_free(m->seats);
 112         hashmap_free(m->sessions);
 113         hashmap_free(m->users);
 114         hashmap_free(m->inhibitors);
 115         hashmap_free(m->buttons);
 116
 117         hashmap_free(m->user_units);
 118         hashmap_free(m->session_units);
 119
 120         sd_event_source_unref(m->idle_action_event_source);
 121         sd_event_source_unref(m->inhibit_timeout_source);
 122         sd_event_source_unref(m->scheduled_shutdown_timeout_source);
 123         sd_event_source_unref(m->nologin_timeout_source);
 124         sd_event_source_unref(m->wall_message_timeout_source);
 125
 126         sd_event_source_unref(m->console_active_event_source);
 127         sd_event_source_unref(m->udev_seat_event_source);
 128         sd_event_source_unref(m->udev_device_event_source);
 129         sd_event_source_unref(m->udev_vcsa_event_source);
 130         sd_event_source_unref(m->udev_button_event_source);
 131         sd_event_source_unref(m->lid_switch_ignore_event_source);
 132
 133         safe_close(m->console_active_fd);
 134
 135         udev_monitor_unref(m->udev_seat_monitor);
 136         udev_monitor_unref(m->udev_device_monitor);
 137         udev_monitor_unref(m->udev_vcsa_monitor);
 138         udev_monitor_unref(m->udev_button_monitor);
 139
 140         udev_unref(m->udev);
 141
 142         if (m->unlink_nologin)
 143                 (void) unlink_or_warn("/run/nologin");
 144
 145         bus_verify_polkit_async_registry_free(m->polkit_registry);
 146
 147         sd_bus_unref(m->bus);
 148         sd_event_unref(m->event);
 149
 150         safe_close(m->reserve_vt_fd);
 151
 152         strv_free(m->kill_only_users);
 153         strv_free(m->kill_exclude_users);
 154
 155         free(m->scheduled_shutdown_type);
 156         free(m->scheduled_shutdown_tty);
 157         free(m->wall_message);
 158         free(m->action_job);
 159         free(m);
 160 }
 161
 162 static int manager_enumerate_devices(Manager *m) {
 163         struct udev_list_entry *item = NULL, *first = NULL;
 164         _cleanup_(udev_enumerate_unrefp) struct udev_enumerate *e = NULL;
 165         int r;
 166
 167         assert(m);
 168
 169         /* Loads devices from udev and creates seats for them as
 170          * necessary */
 171
 172         e = udev_enumerate_new(m->udev);
 173         if (!e)
 174                 return -ENOMEM;
 175
 176         r = udev_enumerate_add_match_tag(e, "master-of-seat");
 177         if (r < 0)
 178                 return r;
 179
 180         r = udev_enumerate_add_match_is_initialized(e);
 181         if (r < 0)
 182                 return r;
 183
 184         r = udev_enumerate_scan_devices(e);
 185         if (r < 0)
 186                 return r;
 187
 188         first = udev_enumerate_get_list_entry(e);
 189         udev_list_entry_foreach(item, first) {
 190                 _cleanup_(udev_device_unrefp) struct udev_device *d = NULL;
 191                 int k;
 192
 193                 d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item));
 194                 if (!d)
 195                         return -ENOMEM;
 196
 197                 k = manager_process_seat_device(m, d);
 198                 if (k < 0)
 199                         r = k;
 200         }
 201
 202         return r;
 203 }
 204
 205 static int manager_enumerate_buttons(Manager *m) {
 206         _cleanup_(udev_enumerate_unrefp) struct udev_enumerate *e = NULL;
 207         struct udev_list_entry *item = NULL, *first = NULL;
 208         int r;
 209
 210         assert(m);
 211
 212         /* Loads buttons from udev */
 213
 214         if (manager_all_buttons_ignored(m))
 215                 return 0;
 216
 217         e = udev_enumerate_new(m->udev);
 218         if (!e)
 219                 return -ENOMEM;
 220
 221         r = udev_enumerate_add_match_subsystem(e, "input");
 222         if (r < 0)
 223                 return r;
 224
 225         r = udev_enumerate_add_match_tag(e, "power-switch");
 226         if (r < 0)
 227                 return r;
 228
 229         r = udev_enumerate_add_match_is_initialized(e);
 230         if (r < 0)
 231                 return r;
 232
 233         r = udev_enumerate_scan_devices(e);
 234         if (r < 0)
 235                 return r;
 236
 237         first = udev_enumerate_get_list_entry(e);
 238         udev_list_entry_foreach(item, first) {
 239                 _cleanup_(udev_device_unrefp) struct udev_device *d = NULL;
 240                 int k;
 241
 242                 d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item));
 243                 if (!d)
 244                         return -ENOMEM;
 245
 246                 k = manager_process_button_device(m, d);
 247                 if (k < 0)
 248                         r = k;
 249         }
 250
 251         return r;
 252 }
 253
 254 static int manager_enumerate_seats(Manager *m) {
 255         _cleanup_closedir_ DIR *d = NULL;
 256         struct dirent *de;
 257         int r = 0;
 258
 259         assert(m);
 260
 261         /* This loads data about seats stored on disk, but does not
 262          * actually create any seats. Removes data of seats that no
 263          * longer exist. */
 264
 265         d = opendir("/run/systemd/seats");
 266         if (!d) {
 267                 if (errno == ENOENT)
 268                         return 0;
 269
 270                 return log_error_errno(errno, "Failed to open /run/systemd/seats: %m");
 271         }
 272
 273         FOREACH_DIRENT(de, d, return -errno) {
 274                 Seat *s;
 275                 int k;
 276
 277                 if (!dirent_is_file(de))
 278                         continue;
 279
 280                 s = hashmap_get(m->seats, de->d_name);
 281                 if (!s) {
 282                         if (unlinkat(dirfd(d), de->d_name, 0) < 0)
 283                                 log_warning("Failed to remove /run/systemd/seats/%s: %m",
 284                                             de->d_name);
 285                         continue;
 286                 }
 287
 288                 k = seat_load(s);
 289                 if (k < 0)
 290                         r = k;
 291         }
 292
 293         return r;
 294 }
 295
 296 static int manager_enumerate_linger_users(Manager *m) {
 297         _cleanup_closedir_ DIR *d = NULL;
 298         struct dirent *de;
 299         int r = 0;
 300
 301         assert(m);
 302
 303         d = opendir("/var/lib/systemd/linger");
 304         if (!d) {
 305                 if (errno == ENOENT)
 306                         return 0;
 307
 308                 return log_error_errno(errno, "Failed to open /var/lib/systemd/linger/: %m");
 309         }
 310
 311         FOREACH_DIRENT(de, d, return -errno) {
 312                 int k;
 313
 314                 if (!dirent_is_file(de))
 315                         continue;
 316
 317                 k = manager_add_user_by_name(m, de->d_name, NULL);
 318                 if (k < 0) {
 319                         log_notice_errno(k, "Couldn't add lingering user %s: %m", de->d_name);
 320                         r = k;
 321                 }
 322         }
 323
 324         return r;
 325 }
 326
 327 static int manager_enumerate_users(Manager *m) {
 328         _cleanup_closedir_ DIR *d = NULL;
 329         struct dirent *de;
 330         int r, k;
 331
 332         assert(m);
 333
 334         /* Add lingering users */
 335         r = manager_enumerate_linger_users(m);
 336
 337         /* Read in user data stored on disk */
 338         d = opendir("/run/systemd/users");
 339         if (!d) {
 340                 if (errno == ENOENT)
 341                         return 0;
 342
 343                 return log_error_errno(errno, "Failed to open /run/systemd/users: %m");
 344         }
 345
 346         FOREACH_DIRENT(de, d, return -errno) {
 347                 User *u;
 348
 349                 if (!dirent_is_file(de))
 350                         continue;
 351
 352                 k = manager_add_user_by_name(m, de->d_name, &u);
 353                 if (k < 0) {
 354                         log_error_errno(k, "Failed to add user by file name %s: %m", de->d_name);
 355
 356                         r = k;
 357                         continue;
 358                 }
 359
 360                 user_add_to_gc_queue(u);
 361
 362                 k = user_load(u);
 363                 if (k < 0)
 364                         r = k;
 365         }
 366
 367         return r;
 368 }
 369
 370 static int parse_fdname(const char *fdname, char **session_id, dev_t *dev) {
 371         _cleanup_strv_free_ char **parts = NULL;
 372         _cleanup_free_ char *id = NULL;
 373         unsigned int major, minor;
 374         int r;
 375
 376         parts = strv_split(fdname, "-");
 377         if (!parts)
 378                 return -ENOMEM;
 379         if (strv_length(parts) != 5)
 380                 return -EINVAL;
 381
 382         if (!streq(parts[0], "session"))
 383                 return -EINVAL;
 384         id = strdup(parts[1]);
 385         if (!id)
 386                 return -ENOMEM;
 387
 388         if (!streq(parts[2], "device"))
 389                 return -EINVAL;
 390         r = safe_atou(parts[3], &major) ||
 391             safe_atou(parts[4], &minor);
 392         if (r < 0)
 393                 return r;
 394
 395         *dev = makedev(major, minor);
 396         *session_id = TAKE_PTR(id);
 397
 398         return 0;
 399 }
 400
 401 static int manager_attach_fds(Manager *m) {
 402         _cleanup_strv_free_ char **fdnames = NULL;
 403         int n, i, fd;
 404
 405         /* Upon restart, PID1 will send us back all fds of session devices
 406          * that we previously opened. Each file descriptor is associated
 407          * with a given session. The session ids are passed through FDNAMES. */
 408
 409         n = sd_listen_fds_with_names(true, &fdnames);
 410         if (n <= 0)
 411                 return n;
 412
 413         for (i = 0; i < n; i++) {
 414                 _cleanup_free_ char *id = NULL;
 415                 dev_t dev;
 416                 struct stat st;
 417                 SessionDevice *sd;
 418                 Session *s;
 419                 int r;
 420
 421                 fd = SD_LISTEN_FDS_START + i;
 422
 423                 r = parse_fdname(fdnames[i], &id, &dev);
 424                 if (r < 0) {
 425                         log_debug_errno(r, "Failed to parse fd name %s: %m", fdnames[i]);
 426                         close_nointr(fd);
 427                         continue;
 428                 }
 429
 430                 s = hashmap_get(m->sessions, id);
 431                 if (!s) {
 432                         /* If the session doesn't exist anymore, the associated session
 433                          * device attached to this fd doesn't either. Let's simply close
 434                          * this fd. */
 435                         log_debug("Failed to attach fd for unknown session: %s", id);
 436                         close_nointr(fd);
 437                         continue;
 438                 }
 439
 440                 if (fstat(fd, &st) < 0) {
 441                         /* The device is allowed to go away at a random point, in which
 442                          * case fstat failing is expected. */
 443                         log_debug_errno(errno, "Failed to stat device fd for session %s: %m", id);
 444                         close_nointr(fd);
 445                         continue;
 446                 }
 447
 448                 if (!S_ISCHR(st.st_mode) || st.st_rdev != dev) {
 449                         log_debug("Device fd doesn't point to the expected character device node");
 450                         close_nointr(fd);
 451                         continue;
 452                 }
 453
 454                 sd = hashmap_get(s->devices, &dev);
 455                 if (!sd) {
 456                         /* Weird, we got an fd for a session device which wasn't
 457                          * recorded in the session state file... */
 458                         log_warning("Got fd for missing session device [%u:%u] in session %s",
 459                                     major(dev), minor(dev), s->id);
 460                         close_nointr(fd);
 461                         continue;
 462                 }
 463
 464                 log_debug("Attaching fd to session device [%u:%u] for session %s",
 465                           major(dev), minor(dev), s->id);
 466
 467                 session_device_attach_fd(sd, fd, s->was_active);
 468         }
 469
 470         return 0;
 471 }
 472
 473 static int manager_enumerate_sessions(Manager *m) {
 474         _cleanup_closedir_ DIR *d = NULL;
 475         struct dirent *de;
 476         int r = 0, k;
 477
 478         assert(m);
 479
 480         /* Read in session data stored on disk */
 481         d = opendir("/run/systemd/sessions");
 482         if (!d) {
 483                 if (errno == ENOENT)
 484                         return 0;
 485
 486                 return log_error_errno(errno, "Failed to open /run/systemd/sessions: %m");
 487         }
 488
 489         FOREACH_DIRENT(de, d, return -errno) {
 490                 struct Session *s;
 491
 492                 if (!dirent_is_file(de))
 493                         continue;
 494
 495                 if (!session_id_valid(de->d_name)) {
 496                         log_warning("Invalid session file name '%s', ignoring.", de->d_name);
 497                         r = -EINVAL;
 498                         continue;
 499                 }
 500
 501                 k = manager_add_session(m, de->d_name, &s);
 502                 if (k < 0) {
 503                         log_error_errno(k, "Failed to add session by file name %s: %m", de->d_name);
 504                         r = k;
 505                         continue;
 506                 }
 507
 508                 session_add_to_gc_queue(s);
 509
 510                 k = session_load(s);
 511                 if (k < 0)
 512                         r = k;
 513         }
 514
 515         /* We might be restarted and PID1 could have sent us back the
 516          * session device fds we previously saved. */
 517         k = manager_attach_fds(m);
 518         if (k < 0)
 519                 log_warning_errno(k, "Failed to reattach session device fds: %m");
 520
 521         return r;
 522 }
 523
 524 static int manager_enumerate_inhibitors(Manager *m) {
 525         _cleanup_closedir_ DIR *d = NULL;
 526         struct dirent *de;
 527         int r = 0;
 528
 529         assert(m);
 530
 531         d = opendir("/run/systemd/inhibit");
 532         if (!d) {
 533                 if (errno == ENOENT)
 534                         return 0;
 535
 536                 return log_error_errno(errno, "Failed to open /run/systemd/inhibit: %m");
 537         }
 538
 539         FOREACH_DIRENT(de, d, return -errno) {
 540                 int k;
 541                 Inhibitor *i;
 542
 543                 if (!dirent_is_file(de))
 544                         continue;
 545
 546                 k = manager_add_inhibitor(m, de->d_name, &i);
 547                 if (k < 0) {
 548                         log_notice_errno(k, "Couldn't add inhibitor %s: %m", de->d_name);
 549                         r = k;
 550                         continue;
 551                 }
 552
 553                 k = inhibitor_load(i);
 554                 if (k < 0)
 555                         r = k;
 556         }
 557
 558         return r;
 559 }
 560
 561 static int manager_dispatch_seat_udev(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 562         _cleanup_(udev_device_unrefp) struct udev_device *d = NULL;
 563         Manager *m = userdata;
 564
 565         assert(m);
 566
 567         d = udev_monitor_receive_device(m->udev_seat_monitor);
 568         if (!d)
 569                 return -ENOMEM;
 570
 571         manager_process_seat_device(m, d);
 572         return 0;
 573 }
 574
 575 static int manager_dispatch_device_udev(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 576         _cleanup_(udev_device_unrefp) struct udev_device *d = NULL;
 577         Manager *m = userdata;
 578
 579         assert(m);
 580
 581         d = udev_monitor_receive_device(m->udev_device_monitor);
 582         if (!d)
 583                 return -ENOMEM;
 584
 585         manager_process_seat_device(m, d);
 586         return 0;
 587 }
 588
 589 static int manager_dispatch_vcsa_udev(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 590         _cleanup_(udev_device_unrefp) struct udev_device *d = NULL;
 591         Manager *m = userdata;
 592         const char *name;
 593
 594         assert(m);
 595
 596         d = udev_monitor_receive_device(m->udev_vcsa_monitor);
 597         if (!d)
 598                 return -ENOMEM;
 599
 600         name = udev_device_get_sysname(d);
 601
 602         /* Whenever a VCSA device is removed try to reallocate our
 603          * VTs, to make sure our auto VTs never go away. */
 604
 605         if (name && startswith(name, "vcsa") && streq_ptr(udev_device_get_action(d), "remove"))
 606                 seat_preallocate_vts(m->seat0);
 607
 608         return 0;
 609 }
 610
 611 static int manager_dispatch_button_udev(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 612         _cleanup_(udev_device_unrefp) struct udev_device *d = NULL;
 613         Manager *m = userdata;
 614
 615         assert(m);
 616
 617         d = udev_monitor_receive_device(m->udev_button_monitor);
 618         if (!d)
 619                 return -ENOMEM;
 620
 621         manager_process_button_device(m, d);
 622         return 0;
 623 }
 624
 625 static int manager_dispatch_console(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 626         Manager *m = userdata;
 627
 628         assert(m);
 629         assert(m->seat0);
 630         assert(m->console_active_fd == fd);
 631
 632         seat_read_active_vt(m->seat0);
 633         return 0;
 634 }
 635
 636 static int manager_reserve_vt(Manager *m) {
 637         _cleanup_free_ char *p = NULL;
 638
 639         assert(m);
 640
 641         if (m->reserve_vt <= 0)
 642                 return 0;
 643
 644         if (asprintf(&p, "/dev/tty%u", m->reserve_vt) < 0)
 645                 return log_oom();
 646
 647         m->reserve_vt_fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
 648         if (m->reserve_vt_fd < 0) {
 649
 650                 /* Don't complain on VT-less systems */
 651                 if (errno != ENOENT)
 652                         log_warning_errno(errno, "Failed to pin reserved VT: %m");
 653                 return -errno;
 654         }
 655
 656         return 0;
 657 }
 658
 659 static int manager_connect_bus(Manager *m) {
 660         int r;
 661
 662         assert(m);
 663         assert(!m->bus);
 664
 665         r = sd_bus_default_system(&m->bus);
 666         if (r < 0)
 667                 return log_error_errno(r, "Failed to connect to system bus: %m");
 668
 669         r = sd_bus_add_object_vtable(m->bus, NULL, "/org/freedesktop/login1", "org.freedesktop.login1.Manager", manager_vtable, m);
 670         if (r < 0)
 671                 return log_error_errno(r, "Failed to add manager object vtable: %m");
 672
 673         r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/login1/seat", "org.freedesktop.login1.Seat", seat_vtable, seat_object_find, m);
 674         if (r < 0)
 675                 return log_error_errno(r, "Failed to add seat object vtable: %m");
 676
 677         r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/login1/seat", seat_node_enumerator, m);
 678         if (r < 0)
 679                 return log_error_errno(r, "Failed to add seat enumerator: %m");
 680
 681         r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/login1/session", "org.freedesktop.login1.Session", session_vtable, session_object_find, m);
 682         if (r < 0)
 683                 return log_error_errno(r, "Failed to add session object vtable: %m");
 684
 685         r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/login1/session", session_node_enumerator, m);
 686         if (r < 0)
 687                 return log_error_errno(r, "Failed to add session enumerator: %m");
 688
 689         r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/login1/user", "org.freedesktop.login1.User", user_vtable, user_object_find, m);
 690         if (r < 0)
 691                 return log_error_errno(r, "Failed to add user object vtable: %m");
 692
 693         r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/login1/user", user_node_enumerator, m);
 694         if (r < 0)
 695                 return log_error_errno(r, "Failed to add user enumerator: %m");
 696
 697         r = sd_bus_match_signal_async(
 698                         m->bus,
 699                         NULL,
 700                         "org.freedesktop.systemd1",
 701                         "/org/freedesktop/systemd1",
 702                         "org.freedesktop.systemd1.Manager",
 703                         "JobRemoved",
 704                         match_job_removed, NULL, m);
 705         if (r < 0)
 706                 return log_error_errno(r, "Failed to request match for JobRemoved: %m");
 707
 708         r = sd_bus_match_signal_async(
 709                         m->bus,
 710                         NULL,
 711                         "org.freedesktop.systemd1",
 712                         "/org/freedesktop/systemd1",
 713                         "org.freedesktop.systemd1.Manager",
 714                         "UnitRemoved",
 715                         match_unit_removed, NULL, m);
 716         if (r < 0)
 717                 return log_error_errno(r, "Failed to request match for UnitRemoved: %m");
 718
 719         r = sd_bus_match_signal_async(
 720                         m->bus,
 721                         NULL,
 722                         "org.freedesktop.systemd1",
 723                         NULL,
 724                         "org.freedesktop.DBus.Properties",
 725                         "PropertiesChanged",
 726                         match_properties_changed, NULL, m);
 727         if (r < 0)
 728                 return log_error_errno(r, "Failed to request match for PropertiesChanged: %m");
 729
 730         r = sd_bus_match_signal_async(
 731                         m->bus,
 732                         NULL,
 733                         "org.freedesktop.systemd1",
 734                         "/org/freedesktop/systemd1",
 735                         "org.freedesktop.systemd1.Manager",
 736                         "Reloading",
 737                         match_reloading, NULL, m);
 738         if (r < 0)
 739                 return log_error_errno(r, "Failed to request match for Reloading: %m");
 740
 741         r = sd_bus_call_method_async(
 742                         m->bus,
 743                         NULL,
 744                         "org.freedesktop.systemd1",
 745                         "/org/freedesktop/systemd1",
 746                         "org.freedesktop.systemd1.Manager",
 747                         "Subscribe",
 748                         NULL, NULL,
 749                         NULL);
 750         if (r < 0)
 751                 return log_error_errno(r, "Failed to enable subscription: %m");
 752
 753         r = sd_bus_request_name_async(m->bus, NULL, "org.freedesktop.login1", 0, NULL, NULL);
 754         if (r < 0)
 755                 return log_error_errno(r, "Failed to request name: %m");
 756
 757         r = sd_bus_attach_event(m->bus, m->event, SD_EVENT_PRIORITY_NORMAL);
 758         if (r < 0)
 759                 return log_error_errno(r, "Failed to attach bus to event loop: %m");
 760
 761         return 0;
 762 }
 763
 764 static int manager_vt_switch(sd_event_source *src, const struct signalfd_siginfo *si, void *data) {
 765         Manager *m = data;
 766         Session *active, *iter;
 767
 768         /*
 769          * We got a VT-switch signal and we have to acknowledge it immediately.
 770          * Preferably, we'd just use m->seat0->active->vtfd, but unfortunately,
 771          * old user-space might run multiple sessions on a single VT, *sigh*.
 772          * Therefore, we have to iterate all sessions and find one with a vtfd
 773          * on the requested VT.
 774          * As only VTs with active controllers have VT_PROCESS set, our current
 775          * notion of the active VT might be wrong (for instance if the switch
 776          * happens while we setup VT_PROCESS). Therefore, read the current VT
 777          * first and then use s->active->vtnr as reference. Note that this is
 778          * not racy, as no further VT-switch can happen as long as we're in
 779          * synchronous VT_PROCESS mode.
 780          */
 781
 782         assert(m->seat0);
 783         seat_read_active_vt(m->seat0);
 784
 785         active = m->seat0->active;
 786         if (!active || active->vtnr < 1) {
 787                 log_warning("Received VT_PROCESS signal without a registered session on that VT.");
 788                 return 0;
 789         }
 790
 791         if (active->vtfd >= 0) {
 792                 session_leave_vt(active);
 793         } else {
 794                 LIST_FOREACH(sessions_by_seat, iter, m->seat0->sessions) {
 795                         if (iter->vtnr == active->vtnr && iter->vtfd >= 0) {
 796                                 session_leave_vt(iter);
 797                                 break;
 798                         }
 799                 }
 800         }
 801
 802         return 0;
 803 }
 804
 805 static int manager_connect_console(Manager *m) {
 806         int r;
 807
 808         assert(m);
 809         assert(m->console_active_fd < 0);
 810
 811         /* On certain architectures (S390 and Xen, and containers),
 812            /dev/tty0 does not exist, so don't fail if we can't open
 813            it. */
 814         if (access("/dev/tty0", F_OK) < 0)
 815                 return 0;
 816
 817         m->console_active_fd = open("/sys/class/tty/tty0/active", O_RDONLY|O_NOCTTY|O_CLOEXEC);
 818         if (m->console_active_fd < 0) {
 819
 820                 /* On some systems the device node /dev/tty0 may exist
 821                  * even though /sys/class/tty/tty0 does not. */
 822                 if (errno == ENOENT)
 823                         return 0;
 824
 825                 return log_error_errno(errno, "Failed to open /sys/class/tty/tty0/active: %m");
 826         }
 827
 828         r = sd_event_add_io(m->event, &m->console_active_event_source, m->console_active_fd, 0, manager_dispatch_console, m);
 829         if (r < 0) {
 830                 log_error("Failed to watch foreground console");
 831                 return r;
 832         }
 833
 834         /*
 835          * SIGRTMIN is used as global VT-release signal, SIGRTMIN + 1 is used
 836          * as VT-acquire signal. We ignore any acquire-events (yes, we still
 837          * have to provide a valid signal-number for it!) and acknowledge all
 838          * release events immediately.
 839          */
 840
 841         if (SIGRTMIN + 1 > SIGRTMAX) {
 842                 log_error("Not enough real-time signals available: %u-%u", SIGRTMIN, SIGRTMAX);
 843                 return -EINVAL;
 844         }
 845
 846         assert_se(ignore_signals(SIGRTMIN + 1, -1) >= 0);
 847         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGRTMIN, -1) >= 0);
 848
 849         r = sd_event_add_signal(m->event, NULL, SIGRTMIN, manager_vt_switch, m);
 850         if (r < 0)
 851                 return r;
 852
 853         return 0;
 854 }
 855
 856 static int manager_connect_udev(Manager *m) {
 857         int r;
 858
 859         assert(m);
 860         assert(!m->udev_seat_monitor);
 861         assert(!m->udev_device_monitor);
 862         assert(!m->udev_vcsa_monitor);
 863         assert(!m->udev_button_monitor);
 864
 865         m->udev_seat_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
 866         if (!m->udev_seat_monitor)
 867                 return -ENOMEM;
 868
 869         r = udev_monitor_filter_add_match_tag(m->udev_seat_monitor, "master-of-seat");
 870         if (r < 0)
 871                 return r;
 872
 873         r = udev_monitor_enable_receiving(m->udev_seat_monitor);
 874         if (r < 0)
 875                 return r;
 876
 877         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);
 878         if (r < 0)
 879                 return r;
 880
 881         m->udev_device_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
 882         if (!m->udev_device_monitor)
 883                 return -ENOMEM;
 884
 885         r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_device_monitor, "input", NULL);
 886         if (r < 0)
 887                 return r;
 888
 889         r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_device_monitor, "graphics", NULL);
 890         if (r < 0)
 891                 return r;
 892
 893         r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_device_monitor, "drm", NULL);
 894         if (r < 0)
 895                 return r;
 896
 897         r = udev_monitor_enable_receiving(m->udev_device_monitor);
 898         if (r < 0)
 899                 return r;
 900
 901         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);
 902         if (r < 0)
 903                 return r;
 904
 905         /* Don't watch keys if nobody cares */
 906         if (!manager_all_buttons_ignored(m)) {
 907                 m->udev_button_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
 908                 if (!m->udev_button_monitor)
 909                         return -ENOMEM;
 910
 911                 r = udev_monitor_filter_add_match_tag(m->udev_button_monitor, "power-switch");
 912                 if (r < 0)
 913                         return r;
 914
 915                 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_button_monitor, "input", NULL);
 916                 if (r < 0)
 917                         return r;
 918
 919                 r = udev_monitor_enable_receiving(m->udev_button_monitor);
 920                 if (r < 0)
 921                         return r;
 922
 923                 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);
 924                 if (r < 0)
 925                         return r;
 926         }
 927
 928         /* Don't bother watching VCSA devices, if nobody cares */
 929         if (m->n_autovts > 0 && m->console_active_fd >= 0) {
 930
 931                 m->udev_vcsa_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
 932                 if (!m->udev_vcsa_monitor)
 933                         return -ENOMEM;
 934
 935                 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_vcsa_monitor, "vc", NULL);
 936                 if (r < 0)
 937                         return r;
 938
 939                 r = udev_monitor_enable_receiving(m->udev_vcsa_monitor);
 940                 if (r < 0)
 941                         return r;
 942
 943                 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);
 944                 if (r < 0)
 945                         return r;
 946         }
 947
 948         return 0;
 949 }
 950
 951 static void manager_gc(Manager *m, bool drop_not_started) {
 952         Seat *seat;
 953         Session *session;
 954         User *user;
 955
 956         assert(m);
 957
 958         while ((seat = m->seat_gc_queue)) {
 959                 LIST_REMOVE(gc_queue, m->seat_gc_queue, seat);
 960                 seat->in_gc_queue = false;
 961
 962                 if (seat_may_gc(seat, drop_not_started)) {
 963                         seat_stop(seat, false);
 964                         seat_free(seat);
 965                 }
 966         }
 967
 968         while ((session = m->session_gc_queue)) {
 969                 LIST_REMOVE(gc_queue, m->session_gc_queue, session);
 970                 session->in_gc_queue = false;
 971
 972                 /* First, if we are not closing yet, initiate stopping */
 973                 if (session_may_gc(session, drop_not_started) &&
 974                     session_get_state(session) != SESSION_CLOSING)
 975                         session_stop(session, false);
 976
 977                 /* Normally, this should make the session referenced
 978                  * again, if it doesn't then let's get rid of it
 979                  * immediately */
 980                 if (session_may_gc(session, drop_not_started)) {
 981                         session_finalize(session);
 982                         session_free(session);
 983                 }
 984         }
 985
 986         while ((user = m->user_gc_queue)) {
 987                 LIST_REMOVE(gc_queue, m->user_gc_queue, user);
 988                 user->in_gc_queue = false;
 989
 990                 /* First step: queue stop jobs */
 991                 if (user_may_gc(user, drop_not_started))
 992                         user_stop(user, false);
 993
 994                 /* Second step: finalize user */
 995                 if (user_may_gc(user, drop_not_started)) {
 996                         user_finalize(user);
 997                         user_free(user);
 998                 }
 999         }
1000 }
1001
1002 static int manager_dispatch_idle_action(sd_event_source *s, uint64_t t, void *userdata) {
1003         Manager *m = userdata;
1004         struct dual_timestamp since;
1005         usec_t n, elapse;
1006         int r;
1007
1008         assert(m);
1009
1010         if (m->idle_action == HANDLE_IGNORE ||
1011             m->idle_action_usec <= 0)
1012                 return 0;
1013
1014         n = now(CLOCK_MONOTONIC);
1015
1016         r = manager_get_idle_hint(m, &since);
1017         if (r <= 0)
1018                 /* Not idle. Let's check if after a timeout it might be idle then. */
1019                 elapse = n + m->idle_action_usec;
1020         else {
1021                 /* Idle! Let's see if it's time to do something, or if
1022                  * we shall sleep for longer. */
1023
1024                 if (n >= since.monotonic + m->idle_action_usec &&
1025                     (m->idle_action_not_before_usec <= 0 || n >= m->idle_action_not_before_usec + m->idle_action_usec)) {
1026                         log_info("System idle. Taking action.");
1027
1028                         manager_handle_action(m, 0, m->idle_action, false, false);
1029                         m->idle_action_not_before_usec = n;
1030                 }
1031
1032                 elapse = MAX(since.monotonic, m->idle_action_not_before_usec) + m->idle_action_usec;
1033         }
1034
1035         if (!m->idle_action_event_source) {
1036
1037                 r = sd_event_add_time(
1038                                 m->event,
1039                                 &m->idle_action_event_source,
1040                                 CLOCK_MONOTONIC,
1041                                 elapse, USEC_PER_SEC*30,
1042                                 manager_dispatch_idle_action, m);
1043                 if (r < 0)
1044                         return log_error_errno(r, "Failed to add idle event source: %m");
1045
1046                 r = sd_event_source_set_priority(m->idle_action_event_source, SD_EVENT_PRIORITY_IDLE+10);
1047                 if (r < 0)
1048                         return log_error_errno(r, "Failed to set idle event source priority: %m");
1049         } else {
1050                 r = sd_event_source_set_time(m->idle_action_event_source, elapse);
1051                 if (r < 0)
1052                         return log_error_errno(r, "Failed to set idle event timer: %m");
1053
1054                 r = sd_event_source_set_enabled(m->idle_action_event_source, SD_EVENT_ONESHOT);
1055                 if (r < 0)
1056                         return log_error_errno(r, "Failed to enable idle event timer: %m");
1057         }
1058
1059         return 0;
1060 }
1061
1062 static int manager_dispatch_reload_signal(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
1063         Manager *m = userdata;
1064         int r;
1065
1066         manager_reset_config(m);
1067         r = manager_parse_config_file(m);
1068         if (r < 0)
1069                 log_warning_errno(r, "Failed to parse config file, using defaults: %m");
1070         else
1071                 log_info("Config file reloaded.");
1072
1073         return 0;
1074 }
1075
1076 static int manager_startup(Manager *m) {
1077         int r;
1078         Seat *seat;
1079         Session *session;
1080         User *user;
1081         Button *button;
1082         Inhibitor *inhibitor;
1083         Iterator i;
1084
1085         assert(m);
1086
1087         assert_se(sigprocmask_many(SIG_SETMASK, NULL, SIGHUP, -1) >= 0);
1088
1089         r = sd_event_add_signal(m->event, NULL, SIGHUP, manager_dispatch_reload_signal, m);
1090         if (r < 0)
1091                 return log_error_errno(r, "Failed to register SIGHUP handler: %m");
1092
1093         /* Connect to console */
1094         r = manager_connect_console(m);
1095         if (r < 0)
1096                 return r;
1097
1098         /* Connect to udev */
1099         r = manager_connect_udev(m);
1100         if (r < 0)
1101                 return log_error_errno(r, "Failed to create udev watchers: %m");
1102
1103         /* Connect to the bus */
1104         r = manager_connect_bus(m);
1105         if (r < 0)
1106                 return r;
1107
1108         /* Instantiate magic seat 0 */
1109         r = manager_add_seat(m, "seat0", &m->seat0);
1110         if (r < 0)
1111                 return log_error_errno(r, "Failed to add seat0: %m");
1112
1113         r = manager_set_lid_switch_ignore(m, 0 + m->holdoff_timeout_usec);
1114         if (r < 0)
1115                 log_warning_errno(r, "Failed to set up lid switch ignore event source: %m");
1116
1117         /* Deserialize state */
1118         r = manager_enumerate_devices(m);
1119         if (r < 0)
1120                 log_warning_errno(r, "Device enumeration failed: %m");
1121
1122         r = manager_enumerate_seats(m);
1123         if (r < 0)
1124                 log_warning_errno(r, "Seat enumeration failed: %m");
1125
1126         r = manager_enumerate_users(m);
1127         if (r < 0)
1128                 log_warning_errno(r, "User enumeration failed: %m");
1129
1130         r = manager_enumerate_sessions(m);
1131         if (r < 0)
1132                 log_warning_errno(r, "Session enumeration failed: %m");
1133
1134         r = manager_enumerate_inhibitors(m);
1135         if (r < 0)
1136                 log_warning_errno(r, "Inhibitor enumeration failed: %m");
1137
1138         r = manager_enumerate_buttons(m);
1139         if (r < 0)
1140                 log_warning_errno(r, "Button enumeration failed: %m");
1141
1142         /* Remove stale objects before we start them */
1143         manager_gc(m, false);
1144
1145         /* Reserve the special reserved VT */
1146         manager_reserve_vt(m);
1147
1148         /* And start everything */
1149         HASHMAP_FOREACH(seat, m->seats, i)
1150                 seat_start(seat);
1151
1152         HASHMAP_FOREACH(user, m->users, i)
1153                 user_start(user);
1154
1155         HASHMAP_FOREACH(session, m->sessions, i)
1156                 session_start(session, NULL);
1157
1158         HASHMAP_FOREACH(inhibitor, m->inhibitors, i)
1159                 inhibitor_start(inhibitor);
1160
1161         HASHMAP_FOREACH(button, m->buttons, i)
1162                 button_check_switches(button);
1163
1164         manager_dispatch_idle_action(NULL, 0, m);
1165
1166         return 0;
1167 }
1168
1169 static int manager_run(Manager *m) {
1170         int r;
1171
1172         assert(m);
1173
1174         for (;;) {
1175                 r = sd_event_get_state(m->event);
1176                 if (r < 0)
1177                         return r;
1178                 if (r == SD_EVENT_FINISHED)
1179                         return 0;
1180
1181                 manager_gc(m, true);
1182
1183                 r = manager_dispatch_delayed(m, false);
1184                 if (r < 0)
1185                         return r;
1186                 if (r > 0)
1187                         continue;
1188
1189                 r = sd_event_run(m->event, (uint64_t) -1);
1190                 if (r < 0)
1191                         return r;
1192         }
1193 }
1194
1195 int main(int argc, char *argv[]) {
1196         Manager *m = NULL;
1197         int r;
1198
1199         log_set_target(LOG_TARGET_AUTO);
1200         log_set_facility(LOG_AUTH);
1201         log_parse_environment();
1202         log_open();
1203
1204         umask(0022);
1205
1206         if (argc != 1) {
1207                 log_error("This program takes no arguments.");
1208                 r = -EINVAL;
1209                 goto finish;
1210         }
1211
1212         r = mac_selinux_init();
1213         if (r < 0) {
1214                 log_error_errno(r, "Could not initialize labelling: %m");
1215                 goto finish;
1216         }
1217
1218         /* Always create the directories people can create inotify
1219          * watches in. Note that some applications might check for the
1220          * existence of /run/systemd/seats/ to determine whether
1221          * logind is available, so please always make sure this check
1222          * stays in. */
1223         mkdir_label("/run/systemd/seats", 0755);
1224         mkdir_label("/run/systemd/users", 0755);
1225         mkdir_label("/run/systemd/sessions", 0755);
1226
1227         m = manager_new();
1228         if (!m) {
1229                 r = log_oom();
1230                 goto finish;
1231         }
1232
1233         manager_parse_config_file(m);
1234
1235         r = manager_startup(m);
1236         if (r < 0) {
1237                 log_error_errno(r, "Failed to fully start up daemon: %m");
1238                 goto finish;
1239         }
1240
1241         log_debug("systemd-logind running as pid "PID_FMT, getpid_cached());
1242
1243         sd_notify(false,
1244                   "READY=1\n"
1245                   "STATUS=Processing requests...");
1246
1247         r = manager_run(m);
1248
1249         log_debug("systemd-logind stopped as pid "PID_FMT, getpid_cached());
1250
1251 finish:
1252         sd_notify(false,
1253                   "STOPPING=1\n"
1254                   "STATUS=Shutting down...");
1255
1256         manager_free(m);
1257
1258         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
1259 }