src/login/logind.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2011 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <errno.h>
  21 #include <fcntl.h>
  22 #include <string.h>
  23 #include <unistd.h>
  24
  25 #include "libudev.h"
  26 #include "sd-daemon.h"
  27
  28 #include "alloc-util.h"
  29 #include "bus-error.h"
  30 #include "bus-util.h"
  31 #include "conf-parser.h"
  32 #include "def.h"
  33 #include "dirent-util.h"
  34 #include "fd-util.h"
  35 #include "formats-util.h"
  36 #include "logind.h"
  37 #include "selinux-util.h"
  38 #include "signal-util.h"
  39 #include "strv.h"
  40 #include "udev-util.h"
  41
  42 static void manager_free(Manager *m);
  43
  44 static Manager *manager_new(void) {
  45         Manager *m;
  46         int r;
  47
  48         m = new0(Manager, 1);
  49         if (!m)
  50                 return NULL;
  51
  52         m->console_active_fd = -1;
  53         m->reserve_vt_fd = -1;
  54
  55         m->n_autovts = 6;
  56         m->reserve_vt = 6;
  57         m->remove_ipc = true;
  58         m->inhibit_delay_max = 5 * USEC_PER_SEC;
  59         m->handle_power_key = HANDLE_POWEROFF;
  60         m->handle_suspend_key = HANDLE_SUSPEND;
  61         m->handle_hibernate_key = HANDLE_HIBERNATE;
  62         m->handle_lid_switch = HANDLE_SUSPEND;
  63         m->handle_lid_switch_docked = HANDLE_IGNORE;
  64         m->lid_switch_ignore_inhibited = true;
  65         m->holdoff_timeout_usec = 30 * USEC_PER_SEC;
  66
  67         m->idle_action_usec = 30 * USEC_PER_MINUTE;
  68         m->idle_action = HANDLE_IGNORE;
  69         m->idle_action_not_before_usec = now(CLOCK_MONOTONIC);
  70
  71         m->runtime_dir_size = PAGE_ALIGN((size_t) (physical_memory() / 10)); /* 10% */
  72         m->user_tasks_max = UINT64_C(12288);
  73
  74         m->devices = hashmap_new(&string_hash_ops);
  75         m->seats = hashmap_new(&string_hash_ops);
  76         m->sessions = hashmap_new(&string_hash_ops);
  77         m->users = hashmap_new(NULL);
  78         m->inhibitors = hashmap_new(&string_hash_ops);
  79         m->buttons = hashmap_new(&string_hash_ops);
  80
  81         m->user_units = hashmap_new(&string_hash_ops);
  82         m->session_units = hashmap_new(&string_hash_ops);
  83
  84         if (!m->devices || !m->seats || !m->sessions || !m->users || !m->inhibitors || !m->buttons || !m->user_units || !m->session_units)
  85                 goto fail;
  86
  87         m->kill_exclude_users = strv_new("root", NULL);
  88         if (!m->kill_exclude_users)
  89                 goto fail;
  90
  91         m->udev = udev_new();
  92         if (!m->udev)
  93                 goto fail;
  94
  95         r = sd_event_default(&m->event);
  96         if (r < 0)
  97                 goto fail;
  98
  99         sd_event_set_watchdog(m->event, true);
 100
 101         return m;
 102
 103 fail:
 104         manager_free(m);
 105         return NULL;
 106 }
 107
 108 static void manager_free(Manager *m) {
 109         Session *session;
 110         User *u;
 111         Device *d;
 112         Seat *s;
 113         Inhibitor *i;
 114         Button *b;
 115
 116         assert(m);
 117
 118         while ((session = hashmap_first(m->sessions)))
 119                 session_free(session);
 120
 121         while ((u = hashmap_first(m->users)))
 122                 user_free(u);
 123
 124         while ((d = hashmap_first(m->devices)))
 125                 device_free(d);
 126
 127         while ((s = hashmap_first(m->seats)))
 128                 seat_free(s);
 129
 130         while ((i = hashmap_first(m->inhibitors)))
 131                 inhibitor_free(i);
 132
 133         while ((b = hashmap_first(m->buttons)))
 134                 button_free(b);
 135
 136         hashmap_free(m->devices);
 137         hashmap_free(m->seats);
 138         hashmap_free(m->sessions);
 139         hashmap_free(m->users);
 140         hashmap_free(m->inhibitors);
 141         hashmap_free(m->buttons);
 142
 143         hashmap_free(m->user_units);
 144         hashmap_free(m->session_units);
 145
 146         sd_event_source_unref(m->idle_action_event_source);
 147         sd_event_source_unref(m->inhibit_timeout_source);
 148         sd_event_source_unref(m->scheduled_shutdown_timeout_source);
 149         sd_event_source_unref(m->nologin_timeout_source);
 150         sd_event_source_unref(m->wall_message_timeout_source);
 151
 152         sd_event_source_unref(m->console_active_event_source);
 153         sd_event_source_unref(m->udev_seat_event_source);
 154         sd_event_source_unref(m->udev_device_event_source);
 155         sd_event_source_unref(m->udev_vcsa_event_source);
 156         sd_event_source_unref(m->udev_button_event_source);
 157         sd_event_source_unref(m->lid_switch_ignore_event_source);
 158
 159         safe_close(m->console_active_fd);
 160
 161         udev_monitor_unref(m->udev_seat_monitor);
 162         udev_monitor_unref(m->udev_device_monitor);
 163         udev_monitor_unref(m->udev_vcsa_monitor);
 164         udev_monitor_unref(m->udev_button_monitor);
 165
 166         udev_unref(m->udev);
 167
 168         if (m->unlink_nologin)
 169                 (void) unlink("/run/nologin");
 170
 171         bus_verify_polkit_async_registry_free(m->polkit_registry);
 172
 173         sd_bus_unref(m->bus);
 174         sd_event_unref(m->event);
 175
 176         safe_close(m->reserve_vt_fd);
 177
 178         strv_free(m->kill_only_users);
 179         strv_free(m->kill_exclude_users);
 180
 181         free(m->scheduled_shutdown_type);
 182         free(m->scheduled_shutdown_tty);
 183         free(m->wall_message);
 184         free(m->action_job);
 185         free(m);
 186 }
 187
 188 static int manager_enumerate_devices(Manager *m) {
 189         struct udev_list_entry *item = NULL, *first = NULL;
 190         _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
 191         int r;
 192
 193         assert(m);
 194
 195         /* Loads devices from udev and creates seats for them as
 196          * necessary */
 197
 198         e = udev_enumerate_new(m->udev);
 199         if (!e)
 200                 return -ENOMEM;
 201
 202         r = udev_enumerate_add_match_tag(e, "master-of-seat");
 203         if (r < 0)
 204                 return r;
 205
 206         r = udev_enumerate_add_match_is_initialized(e);
 207         if (r < 0)
 208                 return r;
 209
 210         r = udev_enumerate_scan_devices(e);
 211         if (r < 0)
 212                 return r;
 213
 214         first = udev_enumerate_get_list_entry(e);
 215         udev_list_entry_foreach(item, first) {
 216                 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
 217                 int k;
 218
 219                 d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item));
 220                 if (!d)
 221                         return -ENOMEM;
 222
 223                 k = manager_process_seat_device(m, d);
 224                 if (k < 0)
 225                         r = k;
 226         }
 227
 228         return r;
 229 }
 230
 231 static int manager_enumerate_buttons(Manager *m) {
 232         _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
 233         struct udev_list_entry *item = NULL, *first = NULL;
 234         int r;
 235
 236         assert(m);
 237
 238         /* Loads buttons from udev */
 239
 240         if (m->handle_power_key == HANDLE_IGNORE &&
 241             m->handle_suspend_key == HANDLE_IGNORE &&
 242             m->handle_hibernate_key == HANDLE_IGNORE &&
 243             m->handle_lid_switch == HANDLE_IGNORE &&
 244             m->handle_lid_switch_docked == HANDLE_IGNORE)
 245                 return 0;
 246
 247         e = udev_enumerate_new(m->udev);
 248         if (!e)
 249                 return -ENOMEM;
 250
 251         r = udev_enumerate_add_match_subsystem(e, "input");
 252         if (r < 0)
 253                 return r;
 254
 255         r = udev_enumerate_add_match_tag(e, "power-switch");
 256         if (r < 0)
 257                 return r;
 258
 259         r = udev_enumerate_add_match_is_initialized(e);
 260         if (r < 0)
 261                 return r;
 262
 263         r = udev_enumerate_scan_devices(e);
 264         if (r < 0)
 265                 return r;
 266
 267         first = udev_enumerate_get_list_entry(e);
 268         udev_list_entry_foreach(item, first) {
 269                 _cleanup_udev_device_unref_ struct udev_device *d = NULL;
 270                 int k;
 271
 272                 d = udev_device_new_from_syspath(m->udev, udev_list_entry_get_name(item));
 273                 if (!d)
 274                         return -ENOMEM;
 275
 276                 k = manager_process_button_device(m, d);
 277                 if (k < 0)
 278                         r = k;
 279         }
 280
 281         return r;
 282 }
 283
 284 static int manager_enumerate_seats(Manager *m) {
 285         _cleanup_closedir_ DIR *d = NULL;
 286         struct dirent *de;
 287         int r = 0;
 288
 289         assert(m);
 290
 291         /* This loads data about seats stored on disk, but does not
 292          * actually create any seats. Removes data of seats that no
 293          * longer exist. */
 294
 295         d = opendir("/run/systemd/seats");
 296         if (!d) {
 297                 if (errno == ENOENT)
 298                         return 0;
 299
 300                 return log_error_errno(errno, "Failed to open /run/systemd/seats: %m");
 301         }
 302
 303         FOREACH_DIRENT(de, d, return -errno) {
 304                 Seat *s;
 305                 int k;
 306
 307                 if (!dirent_is_file(de))
 308                         continue;
 309
 310                 s = hashmap_get(m->seats, de->d_name);
 311                 if (!s) {
 312                         unlinkat(dirfd(d), de->d_name, 0);
 313                         continue;
 314                 }
 315
 316                 k = seat_load(s);
 317                 if (k < 0)
 318                         r = k;
 319         }
 320
 321         return r;
 322 }
 323
 324 static int manager_enumerate_linger_users(Manager *m) {
 325         _cleanup_closedir_ DIR *d = NULL;
 326         struct dirent *de;
 327         int r = 0;
 328
 329         assert(m);
 330
 331         d = opendir("/var/lib/systemd/linger");
 332         if (!d) {
 333                 if (errno == ENOENT)
 334                         return 0;
 335
 336                 return log_error_errno(errno, "Failed to open /var/lib/systemd/linger/: %m");
 337         }
 338
 339         FOREACH_DIRENT(de, d, return -errno) {
 340                 int k;
 341
 342                 if (!dirent_is_file(de))
 343                         continue;
 344
 345                 k = manager_add_user_by_name(m, de->d_name, NULL);
 346                 if (k < 0) {
 347                         log_notice_errno(k, "Couldn't add lingering user %s: %m", de->d_name);
 348                         r = k;
 349                 }
 350         }
 351
 352         return r;
 353 }
 354
 355 static int manager_enumerate_users(Manager *m) {
 356         _cleanup_closedir_ DIR *d = NULL;
 357         struct dirent *de;
 358         int r, k;
 359
 360         assert(m);
 361
 362         /* Add lingering users */
 363         r = manager_enumerate_linger_users(m);
 364
 365         /* Read in user data stored on disk */
 366         d = opendir("/run/systemd/users");
 367         if (!d) {
 368                 if (errno == ENOENT)
 369                         return 0;
 370
 371                 return log_error_errno(errno, "Failed to open /run/systemd/users: %m");
 372         }
 373
 374         FOREACH_DIRENT(de, d, return -errno) {
 375                 User *u;
 376
 377                 if (!dirent_is_file(de))
 378                         continue;
 379
 380                 k = manager_add_user_by_name(m, de->d_name, &u);
 381                 if (k < 0) {
 382                         log_error_errno(k, "Failed to add user by file name %s: %m", de->d_name);
 383
 384                         r = k;
 385                         continue;
 386                 }
 387
 388                 user_add_to_gc_queue(u);
 389
 390                 k = user_load(u);
 391                 if (k < 0)
 392                         r = k;
 393         }
 394
 395         return r;
 396 }
 397
 398 static int manager_enumerate_sessions(Manager *m) {
 399         _cleanup_closedir_ DIR *d = NULL;
 400         struct dirent *de;
 401         int r = 0;
 402
 403         assert(m);
 404
 405         /* Read in session data stored on disk */
 406         d = opendir("/run/systemd/sessions");
 407         if (!d) {
 408                 if (errno == ENOENT)
 409                         return 0;
 410
 411                 return log_error_errno(errno, "Failed to open /run/systemd/sessions: %m");
 412         }
 413
 414         FOREACH_DIRENT(de, d, return -errno) {
 415                 struct Session *s;
 416                 int k;
 417
 418                 if (!dirent_is_file(de))
 419                         continue;
 420
 421                 if (!session_id_valid(de->d_name)) {
 422                         log_warning("Invalid session file name '%s', ignoring.", de->d_name);
 423                         r = -EINVAL;
 424                         continue;
 425                 }
 426
 427                 k = manager_add_session(m, de->d_name, &s);
 428                 if (k < 0) {
 429                         log_error_errno(k, "Failed to add session by file name %s: %m", de->d_name);
 430
 431                         r = k;
 432                         continue;
 433                 }
 434
 435                 session_add_to_gc_queue(s);
 436
 437                 k = session_load(s);
 438                 if (k < 0)
 439                         r = k;
 440         }
 441
 442         return r;
 443 }
 444
 445 static int manager_enumerate_inhibitors(Manager *m) {
 446         _cleanup_closedir_ DIR *d = NULL;
 447         struct dirent *de;
 448         int r = 0;
 449
 450         assert(m);
 451
 452         d = opendir("/run/systemd/inhibit");
 453         if (!d) {
 454                 if (errno == ENOENT)
 455                         return 0;
 456
 457                 return log_error_errno(errno, "Failed to open /run/systemd/inhibit: %m");
 458         }
 459
 460         FOREACH_DIRENT(de, d, return -errno) {
 461                 int k;
 462                 Inhibitor *i;
 463
 464                 if (!dirent_is_file(de))
 465                         continue;
 466
 467                 k = manager_add_inhibitor(m, de->d_name, &i);
 468                 if (k < 0) {
 469                         log_notice_errno(k, "Couldn't add inhibitor %s: %m", de->d_name);
 470                         r = k;
 471                         continue;
 472                 }
 473
 474                 k = inhibitor_load(i);
 475                 if (k < 0)
 476                         r = k;
 477         }
 478
 479         return r;
 480 }
 481
 482 static int manager_dispatch_seat_udev(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 483         _cleanup_udev_device_unref_ struct udev_device *d = NULL;
 484         Manager *m = userdata;
 485
 486         assert(m);
 487
 488         d = udev_monitor_receive_device(m->udev_seat_monitor);
 489         if (!d)
 490                 return -ENOMEM;
 491
 492         manager_process_seat_device(m, d);
 493         return 0;
 494 }
 495
 496 static int manager_dispatch_device_udev(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 497         _cleanup_udev_device_unref_ struct udev_device *d = NULL;
 498         Manager *m = userdata;
 499
 500         assert(m);
 501
 502         d = udev_monitor_receive_device(m->udev_device_monitor);
 503         if (!d)
 504                 return -ENOMEM;
 505
 506         manager_process_seat_device(m, d);
 507         return 0;
 508 }
 509
 510 static int manager_dispatch_vcsa_udev(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 511         _cleanup_udev_device_unref_ struct udev_device *d = NULL;
 512         Manager *m = userdata;
 513         const char *name;
 514
 515         assert(m);
 516
 517         d = udev_monitor_receive_device(m->udev_vcsa_monitor);
 518         if (!d)
 519                 return -ENOMEM;
 520
 521         name = udev_device_get_sysname(d);
 522
 523         /* Whenever a VCSA device is removed try to reallocate our
 524          * VTs, to make sure our auto VTs never go away. */
 525
 526         if (name && startswith(name, "vcsa") && streq_ptr(udev_device_get_action(d), "remove"))
 527                 seat_preallocate_vts(m->seat0);
 528
 529         return 0;
 530 }
 531
 532 static int manager_dispatch_button_udev(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 533         _cleanup_udev_device_unref_ struct udev_device *d = NULL;
 534         Manager *m = userdata;
 535
 536         assert(m);
 537
 538         d = udev_monitor_receive_device(m->udev_button_monitor);
 539         if (!d)
 540                 return -ENOMEM;
 541
 542         manager_process_button_device(m, d);
 543         return 0;
 544 }
 545
 546 static int manager_dispatch_console(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
 547         Manager *m = userdata;
 548
 549         assert(m);
 550         assert(m->seat0);
 551         assert(m->console_active_fd == fd);
 552
 553         seat_read_active_vt(m->seat0);
 554         return 0;
 555 }
 556
 557 static int manager_reserve_vt(Manager *m) {
 558         _cleanup_free_ char *p = NULL;
 559
 560         assert(m);
 561
 562         if (m->reserve_vt <= 0)
 563                 return 0;
 564
 565         if (asprintf(&p, "/dev/tty%u", m->reserve_vt) < 0)
 566                 return log_oom();
 567
 568         m->reserve_vt_fd = open(p, O_RDWR|O_NOCTTY|O_CLOEXEC|O_NONBLOCK);
 569         if (m->reserve_vt_fd < 0) {
 570
 571                 /* Don't complain on VT-less systems */
 572                 if (errno != ENOENT)
 573                         log_warning_errno(errno, "Failed to pin reserved VT: %m");
 574                 return -errno;
 575         }
 576
 577         return 0;
 578 }
 579
 580 static int manager_connect_bus(Manager *m) {
 581         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 582         int r;
 583
 584         assert(m);
 585         assert(!m->bus);
 586
 587         r = sd_bus_default_system(&m->bus);
 588         if (r < 0)
 589                 return log_error_errno(r, "Failed to connect to system bus: %m");
 590
 591         r = sd_bus_add_object_vtable(m->bus, NULL, "/org/freedesktop/login1", "org.freedesktop.login1.Manager", manager_vtable, m);
 592         if (r < 0)
 593                 return log_error_errno(r, "Failed to add manager object vtable: %m");
 594
 595         r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/login1/seat", "org.freedesktop.login1.Seat", seat_vtable, seat_object_find, m);
 596         if (r < 0)
 597                 return log_error_errno(r, "Failed to add seat object vtable: %m");
 598
 599         r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/login1/seat", seat_node_enumerator, m);
 600         if (r < 0)
 601                 return log_error_errno(r, "Failed to add seat enumerator: %m");
 602
 603         r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/login1/session", "org.freedesktop.login1.Session", session_vtable, session_object_find, m);
 604         if (r < 0)
 605                 return log_error_errno(r, "Failed to add session object vtable: %m");
 606
 607         r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/login1/session", session_node_enumerator, m);
 608         if (r < 0)
 609                 return log_error_errno(r, "Failed to add session enumerator: %m");
 610
 611         r = sd_bus_add_fallback_vtable(m->bus, NULL, "/org/freedesktop/login1/user", "org.freedesktop.login1.User", user_vtable, user_object_find, m);
 612         if (r < 0)
 613                 return log_error_errno(r, "Failed to add user object vtable: %m");
 614
 615         r = sd_bus_add_node_enumerator(m->bus, NULL, "/org/freedesktop/login1/user", user_node_enumerator, m);
 616         if (r < 0)
 617                 return log_error_errno(r, "Failed to add user enumerator: %m");
 618
 619         r = sd_bus_add_match(m->bus,
 620                              NULL,
 621                              "type='signal',"
 622                              "sender='org.freedesktop.systemd1',"
 623                              "interface='org.freedesktop.systemd1.Manager',"
 624                              "member='JobRemoved',"
 625                              "path='/org/freedesktop/systemd1'",
 626                              match_job_removed, m);
 627         if (r < 0)
 628                 return log_error_errno(r, "Failed to add match for JobRemoved: %m");
 629
 630         r = sd_bus_add_match(m->bus,
 631                              NULL,
 632                              "type='signal',"
 633                              "sender='org.freedesktop.systemd1',"
 634                              "interface='org.freedesktop.systemd1.Manager',"
 635                              "member='UnitRemoved',"
 636                              "path='/org/freedesktop/systemd1'",
 637                              match_unit_removed, m);
 638         if (r < 0)
 639                 return log_error_errno(r, "Failed to add match for UnitRemoved: %m");
 640
 641         r = sd_bus_add_match(m->bus,
 642                              NULL,
 643                              "type='signal',"
 644                              "sender='org.freedesktop.systemd1',"
 645                              "interface='org.freedesktop.DBus.Properties',"
 646                              "member='PropertiesChanged'",
 647                              match_properties_changed, m);
 648         if (r < 0)
 649                 return log_error_errno(r, "Failed to add match for PropertiesChanged: %m");
 650
 651         r = sd_bus_add_match(m->bus,
 652                              NULL,
 653                              "type='signal',"
 654                              "sender='org.freedesktop.systemd1',"
 655                              "interface='org.freedesktop.systemd1.Manager',"
 656                              "member='Reloading',"
 657                              "path='/org/freedesktop/systemd1'",
 658                              match_reloading, m);
 659         if (r < 0)
 660                 return log_error_errno(r, "Failed to add match for Reloading: %m");
 661
 662         r = sd_bus_call_method(
 663                         m->bus,
 664                         "org.freedesktop.systemd1",
 665                         "/org/freedesktop/systemd1",
 666                         "org.freedesktop.systemd1.Manager",
 667                         "Subscribe",
 668                         &error,
 669                         NULL, NULL);
 670         if (r < 0) {
 671                 log_error("Failed to enable subscription: %s", bus_error_message(&error, r));
 672                 return r;
 673         }
 674
 675         r = sd_bus_request_name(m->bus, "org.freedesktop.login1", 0);
 676         if (r < 0)
 677                 return log_error_errno(r, "Failed to register name: %m");
 678
 679         r = sd_bus_attach_event(m->bus, m->event, 0);
 680         if (r < 0)
 681                 return log_error_errno(r, "Failed to attach bus to event loop: %m");
 682
 683         return 0;
 684 }
 685
 686 static int manager_vt_switch(sd_event_source *src, const struct signalfd_siginfo *si, void *data) {
 687         Manager *m = data;
 688         Session *active, *iter;
 689
 690         /*
 691          * We got a VT-switch signal and we have to acknowledge it immediately.
 692          * Preferably, we'd just use m->seat0->active->vtfd, but unfortunately,
 693          * old user-space might run multiple sessions on a single VT, *sigh*.
 694          * Therefore, we have to iterate all sessions and find one with a vtfd
 695          * on the requested VT.
 696          * As only VTs with active controllers have VT_PROCESS set, our current
 697          * notion of the active VT might be wrong (for instance if the switch
 698          * happens while we setup VT_PROCESS). Therefore, read the current VT
 699          * first and then use s->active->vtnr as reference. Note that this is
 700          * not racy, as no further VT-switch can happen as long as we're in
 701          * synchronous VT_PROCESS mode.
 702          */
 703
 704         assert(m->seat0);
 705         seat_read_active_vt(m->seat0);
 706
 707         active = m->seat0->active;
 708         if (!active || active->vtnr < 1) {
 709                 log_warning("Received VT_PROCESS signal without a registered session on that VT.");
 710                 return 0;
 711         }
 712
 713         if (active->vtfd >= 0) {
 714                 session_leave_vt(active);
 715         } else {
 716                 LIST_FOREACH(sessions_by_seat, iter, m->seat0->sessions) {
 717                         if (iter->vtnr == active->vtnr && iter->vtfd >= 0) {
 718                                 session_leave_vt(iter);
 719                                 break;
 720                         }
 721                 }
 722         }
 723
 724         return 0;
 725 }
 726
 727 static int manager_connect_console(Manager *m) {
 728         int r;
 729
 730         assert(m);
 731         assert(m->console_active_fd < 0);
 732
 733         /* On certain architectures (S390 and Xen, and containers),
 734            /dev/tty0 does not exist, so don't fail if we can't open
 735            it. */
 736         if (access("/dev/tty0", F_OK) < 0)
 737                 return 0;
 738
 739         m->console_active_fd = open("/sys/class/tty/tty0/active", O_RDONLY|O_NOCTTY|O_CLOEXEC);
 740         if (m->console_active_fd < 0) {
 741
 742                 /* On some systems the device node /dev/tty0 may exist
 743                  * even though /sys/class/tty/tty0 does not. */
 744                 if (errno == ENOENT)
 745                         return 0;
 746
 747                 return log_error_errno(errno, "Failed to open /sys/class/tty/tty0/active: %m");
 748         }
 749
 750         r = sd_event_add_io(m->event, &m->console_active_event_source, m->console_active_fd, 0, manager_dispatch_console, m);
 751         if (r < 0) {
 752                 log_error("Failed to watch foreground console");
 753                 return r;
 754         }
 755
 756         /*
 757          * SIGRTMIN is used as global VT-release signal, SIGRTMIN + 1 is used
 758          * as VT-acquire signal. We ignore any acquire-events (yes, we still
 759          * have to provide a valid signal-number for it!) and acknowledge all
 760          * release events immediately.
 761          */
 762
 763         if (SIGRTMIN + 1 > SIGRTMAX) {
 764                 log_error("Not enough real-time signals available: %u-%u", SIGRTMIN, SIGRTMAX);
 765                 return -EINVAL;
 766         }
 767
 768         assert_se(ignore_signals(SIGRTMIN + 1, -1) >= 0);
 769         assert_se(sigprocmask_many(SIG_BLOCK, NULL, SIGRTMIN, -1) >= 0);
 770
 771         r = sd_event_add_signal(m->event, NULL, SIGRTMIN, manager_vt_switch, m);
 772         if (r < 0)
 773                 return r;
 774
 775         return 0;
 776 }
 777
 778 static int manager_connect_udev(Manager *m) {
 779         int r;
 780
 781         assert(m);
 782         assert(!m->udev_seat_monitor);
 783         assert(!m->udev_device_monitor);
 784         assert(!m->udev_vcsa_monitor);
 785         assert(!m->udev_button_monitor);
 786
 787         m->udev_seat_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
 788         if (!m->udev_seat_monitor)
 789                 return -ENOMEM;
 790
 791         r = udev_monitor_filter_add_match_tag(m->udev_seat_monitor, "master-of-seat");
 792         if (r < 0)
 793                 return r;
 794
 795         r = udev_monitor_enable_receiving(m->udev_seat_monitor);
 796         if (r < 0)
 797                 return r;
 798
 799         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);
 800         if (r < 0)
 801                 return r;
 802
 803         m->udev_device_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
 804         if (!m->udev_device_monitor)
 805                 return -ENOMEM;
 806
 807         r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_device_monitor, "input", NULL);
 808         if (r < 0)
 809                 return r;
 810
 811         r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_device_monitor, "graphics", NULL);
 812         if (r < 0)
 813                 return r;
 814
 815         r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_device_monitor, "drm", NULL);
 816         if (r < 0)
 817                 return r;
 818
 819         r = udev_monitor_enable_receiving(m->udev_device_monitor);
 820         if (r < 0)
 821                 return r;
 822
 823         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);
 824         if (r < 0)
 825                 return r;
 826
 827         /* Don't watch keys if nobody cares */
 828         if (m->handle_power_key != HANDLE_IGNORE ||
 829             m->handle_suspend_key != HANDLE_IGNORE ||
 830             m->handle_hibernate_key != HANDLE_IGNORE ||
 831             m->handle_lid_switch != HANDLE_IGNORE ||
 832             m->handle_lid_switch_docked != HANDLE_IGNORE) {
 833
 834                 m->udev_button_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
 835                 if (!m->udev_button_monitor)
 836                         return -ENOMEM;
 837
 838                 r = udev_monitor_filter_add_match_tag(m->udev_button_monitor, "power-switch");
 839                 if (r < 0)
 840                         return r;
 841
 842                 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_button_monitor, "input", NULL);
 843                 if (r < 0)
 844                         return r;
 845
 846                 r = udev_monitor_enable_receiving(m->udev_button_monitor);
 847                 if (r < 0)
 848                         return r;
 849
 850                 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);
 851                 if (r < 0)
 852                         return r;
 853         }
 854
 855         /* Don't bother watching VCSA devices, if nobody cares */
 856         if (m->n_autovts > 0 && m->console_active_fd >= 0) {
 857
 858                 m->udev_vcsa_monitor = udev_monitor_new_from_netlink(m->udev, "udev");
 859                 if (!m->udev_vcsa_monitor)
 860                         return -ENOMEM;
 861
 862                 r = udev_monitor_filter_add_match_subsystem_devtype(m->udev_vcsa_monitor, "vc", NULL);
 863                 if (r < 0)
 864                         return r;
 865
 866                 r = udev_monitor_enable_receiving(m->udev_vcsa_monitor);
 867                 if (r < 0)
 868                         return r;
 869
 870                 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);
 871                 if (r < 0)
 872                         return r;
 873         }
 874
 875         return 0;
 876 }
 877
 878 static void manager_gc(Manager *m, bool drop_not_started) {
 879         Seat *seat;
 880         Session *session;
 881         User *user;
 882
 883         assert(m);
 884
 885         while ((seat = m->seat_gc_queue)) {
 886                 LIST_REMOVE(gc_queue, m->seat_gc_queue, seat);
 887                 seat->in_gc_queue = false;
 888
 889                 if (!seat_check_gc(seat, drop_not_started)) {
 890                         seat_stop(seat, false);
 891                         seat_free(seat);
 892                 }
 893         }
 894
 895         while ((session = m->session_gc_queue)) {
 896                 LIST_REMOVE(gc_queue, m->session_gc_queue, session);
 897                 session->in_gc_queue = false;
 898
 899                 /* First, if we are not closing yet, initiate stopping */
 900                 if (!session_check_gc(session, drop_not_started) &&
 901                     session_get_state(session) != SESSION_CLOSING)
 902                         session_stop(session, false);
 903
 904                 /* Normally, this should make the session referenced
 905                  * again, if it doesn't then let's get rid of it
 906                  * immediately */
 907                 if (!session_check_gc(session, drop_not_started)) {
 908                         session_finalize(session);
 909                         session_free(session);
 910                 }
 911         }
 912
 913         while ((user = m->user_gc_queue)) {
 914                 LIST_REMOVE(gc_queue, m->user_gc_queue, user);
 915                 user->in_gc_queue = false;
 916
 917                 /* First step: queue stop jobs */
 918                 if (!user_check_gc(user, drop_not_started))
 919                         user_stop(user, false);
 920
 921                 /* Second step: finalize user */
 922                 if (!user_check_gc(user, drop_not_started)) {
 923                         user_finalize(user);
 924                         user_free(user);
 925                 }
 926         }
 927 }
 928
 929 static int manager_dispatch_idle_action(sd_event_source *s, uint64_t t, void *userdata) {
 930         Manager *m = userdata;
 931         struct dual_timestamp since;
 932         usec_t n, elapse;
 933         int r;
 934
 935         assert(m);
 936
 937         if (m->idle_action == HANDLE_IGNORE ||
 938             m->idle_action_usec <= 0)
 939                 return 0;
 940
 941         n = now(CLOCK_MONOTONIC);
 942
 943         r = manager_get_idle_hint(m, &since);
 944         if (r <= 0)
 945                 /* Not idle. Let's check if after a timeout it might be idle then. */
 946                 elapse = n + m->idle_action_usec;
 947         else {
 948                 /* Idle! Let's see if it's time to do something, or if
 949                  * we shall sleep for longer. */
 950
 951                 if (n >= since.monotonic + m->idle_action_usec &&
 952                     (m->idle_action_not_before_usec <= 0 || n >= m->idle_action_not_before_usec + m->idle_action_usec)) {
 953                         log_info("System idle. Taking action.");
 954
 955                         manager_handle_action(m, 0, m->idle_action, false, false);
 956                         m->idle_action_not_before_usec = n;
 957                 }
 958
 959                 elapse = MAX(since.monotonic, m->idle_action_not_before_usec) + m->idle_action_usec;
 960         }
 961
 962         if (!m->idle_action_event_source) {
 963
 964                 r = sd_event_add_time(
 965                                 m->event,
 966                                 &m->idle_action_event_source,
 967                                 CLOCK_MONOTONIC,
 968                                 elapse, USEC_PER_SEC*30,
 969                                 manager_dispatch_idle_action, m);
 970                 if (r < 0)
 971                         return log_error_errno(r, "Failed to add idle event source: %m");
 972
 973                 r = sd_event_source_set_priority(m->idle_action_event_source, SD_EVENT_PRIORITY_IDLE+10);
 974                 if (r < 0)
 975                         return log_error_errno(r, "Failed to set idle event source priority: %m");
 976         } else {
 977                 r = sd_event_source_set_time(m->idle_action_event_source, elapse);
 978                 if (r < 0)
 979                         return log_error_errno(r, "Failed to set idle event timer: %m");
 980
 981                 r = sd_event_source_set_enabled(m->idle_action_event_source, SD_EVENT_ONESHOT);
 982                 if (r < 0)
 983                         return log_error_errno(r, "Failed to enable idle event timer: %m");
 984         }
 985
 986         return 0;
 987 }
 988
 989 static int manager_startup(Manager *m) {
 990         int r;
 991         Seat *seat;
 992         Session *session;
 993         User *user;
 994         Button *button;
 995         Inhibitor *inhibitor;
 996         Iterator i;
 997
 998         assert(m);
 999
1000         /* Connect to console */
1001         r = manager_connect_console(m);
1002         if (r < 0)
1003                 return r;
1004
1005         /* Connect to udev */
1006         r = manager_connect_udev(m);
1007         if (r < 0)
1008                 return log_error_errno(r, "Failed to create udev watchers: %m");
1009
1010         /* Connect to the bus */
1011         r = manager_connect_bus(m);
1012         if (r < 0)
1013                 return r;
1014
1015         /* Instantiate magic seat 0 */
1016         r = manager_add_seat(m, "seat0", &m->seat0);
1017         if (r < 0)
1018                 return log_error_errno(r, "Failed to add seat0: %m");
1019
1020         r = manager_set_lid_switch_ignore(m, 0 + m->holdoff_timeout_usec);
1021         if (r < 0)
1022                 log_warning_errno(r, "Failed to set up lid switch ignore event source: %m");
1023
1024         /* Deserialize state */
1025         r = manager_enumerate_devices(m);
1026         if (r < 0)
1027                 log_warning_errno(r, "Device enumeration failed: %m");
1028
1029         r = manager_enumerate_seats(m);
1030         if (r < 0)
1031                 log_warning_errno(r, "Seat enumeration failed: %m");
1032
1033         r = manager_enumerate_users(m);
1034         if (r < 0)
1035                 log_warning_errno(r, "User enumeration failed: %m");
1036
1037         r = manager_enumerate_sessions(m);
1038         if (r < 0)
1039                 log_warning_errno(r, "Session enumeration failed: %m");
1040
1041         r = manager_enumerate_inhibitors(m);
1042         if (r < 0)
1043                 log_warning_errno(r, "Inhibitor enumeration failed: %m");
1044
1045         r = manager_enumerate_buttons(m);
1046         if (r < 0)
1047                 log_warning_errno(r, "Button enumeration failed: %m");
1048
1049         /* Remove stale objects before we start them */
1050         manager_gc(m, false);
1051
1052         /* Reserve the special reserved VT */
1053         manager_reserve_vt(m);
1054
1055         /* And start everything */
1056         HASHMAP_FOREACH(seat, m->seats, i)
1057                 seat_start(seat);
1058
1059         HASHMAP_FOREACH(user, m->users, i)
1060                 user_start(user);
1061
1062         HASHMAP_FOREACH(session, m->sessions, i)
1063                 session_start(session);
1064
1065         HASHMAP_FOREACH(inhibitor, m->inhibitors, i)
1066                 inhibitor_start(inhibitor);
1067
1068         HASHMAP_FOREACH(button, m->buttons, i)
1069                 button_check_switches(button);
1070
1071         manager_dispatch_idle_action(NULL, 0, m);
1072
1073         return 0;
1074 }
1075
1076 static int manager_run(Manager *m) {
1077         int r;
1078
1079         assert(m);
1080
1081         for (;;) {
1082                 r = sd_event_get_state(m->event);
1083                 if (r < 0)
1084                         return r;
1085                 if (r == SD_EVENT_FINISHED)
1086                         return 0;
1087
1088                 manager_gc(m, true);
1089
1090                 r = manager_dispatch_delayed(m, false);
1091                 if (r < 0)
1092                         return r;
1093                 if (r > 0)
1094                         continue;
1095
1096                 r = sd_event_run(m->event, (uint64_t) -1);
1097                 if (r < 0)
1098                         return r;
1099         }
1100 }
1101
1102 static int manager_parse_config_file(Manager *m) {
1103         assert(m);
1104
1105         return config_parse_many(PKGSYSCONFDIR "/logind.conf",
1106                                  CONF_PATHS_NULSTR("systemd/logind.conf.d"),
1107                                  "Login\0",
1108                                  config_item_perf_lookup, logind_gperf_lookup,
1109                                  false, m);
1110 }
1111
1112 int main(int argc, char *argv[]) {
1113         Manager *m = NULL;
1114         int r;
1115
1116         log_set_target(LOG_TARGET_AUTO);
1117         log_set_facility(LOG_AUTH);
1118         log_parse_environment();
1119         log_open();
1120
1121         umask(0022);
1122
1123         if (argc != 1) {
1124                 log_error("This program takes no arguments.");
1125                 r = -EINVAL;
1126                 goto finish;
1127         }
1128
1129         r = mac_selinux_init("/run");
1130         if (r < 0) {
1131                 log_error_errno(r, "Could not initialize labelling: %m");
1132                 goto finish;
1133         }
1134
1135         /* Always create the directories people can create inotify
1136          * watches in. Note that some applications might check for the
1137          * existence of /run/systemd/seats/ to determine whether
1138          * logind is available, so please always make sure this check
1139          * stays in. */
1140         mkdir_label("/run/systemd/seats", 0755);
1141         mkdir_label("/run/systemd/users", 0755);
1142         mkdir_label("/run/systemd/sessions", 0755);
1143
1144         m = manager_new();
1145         if (!m) {
1146                 r = log_oom();
1147                 goto finish;
1148         }
1149
1150         manager_parse_config_file(m);
1151
1152         r = manager_startup(m);
1153         if (r < 0) {
1154                 log_error_errno(r, "Failed to fully start up daemon: %m");
1155                 goto finish;
1156         }
1157
1158         log_debug("systemd-logind running as pid "PID_FMT, getpid());
1159
1160         sd_notify(false,
1161                   "READY=1\n"
1162                   "STATUS=Processing requests...");
1163
1164         r = manager_run(m);
1165
1166         log_debug("systemd-logind stopped as pid "PID_FMT, getpid());
1167
1168 finish:
1169         sd_notify(false,
1170                   "STOPPING=1\n"
1171                   "STATUS=Shutting down...");
1172
1173         manager_free(m);
1174
1175         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
1176 }