src/login/logind-core.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <fcntl.h>
   4 #include <sys/ioctl.h>
   5 #include <sys/types.h>
   6 #include <linux/vt.h>
   7
   8 #include "sd-device.h"
   9
  10 #include "alloc-util.h"
  11 #include "battery-util.h"
  12 #include "bus-error.h"
  13 #include "bus-locator.h"
  14 #include "bus-util.h"
  15 #include "cgroup-util.h"
  16 #include "conf-parser.h"
  17 #include "device-util.h"
  18 #include "efi-loader.h"
  19 #include "errno-util.h"
  20 #include "fd-util.h"
  21 #include "limits-util.h"
  22 #include "logind.h"
  23 #include "parse-util.h"
  24 #include "path-util.h"
  25 #include "process-util.h"
  26 #include "stdio-util.h"
  27 #include "strv.h"
  28 #include "terminal-util.h"
  29 #include "udev-util.h"
  30 #include "user-util.h"
  31 #include "userdb.h"
  32 #include "utmp-wtmp.h"
  33
  34 void manager_reset_config(Manager *m) {
  35         assert(m);
  36
  37         m->n_autovts = 6;
  38         m->reserve_vt = 6;
  39         m->remove_ipc = true;
  40         m->inhibit_delay_max = 5 * USEC_PER_SEC;
  41         m->user_stop_delay = 10 * USEC_PER_SEC;
  42
  43         m->handle_power_key = HANDLE_POWEROFF;
  44         m->handle_power_key_long_press = HANDLE_IGNORE;
  45         m->handle_reboot_key = HANDLE_REBOOT;
  46         m->handle_reboot_key_long_press = HANDLE_POWEROFF;
  47         m->handle_suspend_key = HANDLE_SUSPEND;
  48         m->handle_suspend_key_long_press = HANDLE_HIBERNATE;
  49         m->handle_hibernate_key = HANDLE_HIBERNATE;
  50         m->handle_hibernate_key_long_press = HANDLE_IGNORE;
  51
  52         m->handle_lid_switch = HANDLE_SUSPEND;
  53         m->handle_lid_switch_ep = _HANDLE_ACTION_INVALID;
  54         m->handle_lid_switch_docked = HANDLE_IGNORE;
  55
  56         m->power_key_ignore_inhibited = false;
  57         m->suspend_key_ignore_inhibited = false;
  58         m->hibernate_key_ignore_inhibited = false;
  59         m->lid_switch_ignore_inhibited = true;
  60         m->reboot_key_ignore_inhibited = false;
  61
  62         m->holdoff_timeout_usec = 30 * USEC_PER_SEC;
  63
  64         m->idle_action_usec = 30 * USEC_PER_MINUTE;
  65         m->idle_action = HANDLE_IGNORE;
  66
  67         m->runtime_dir_size = physical_memory_scale(10U, 100U); /* 10% */
  68         m->runtime_dir_inodes = DIV_ROUND_UP(m->runtime_dir_size, 4096); /* 4k per inode */
  69         m->sessions_max = 8192;
  70         m->inhibitors_max = 8192;
  71
  72         m->kill_user_processes = KILL_USER_PROCESSES;
  73
  74         m->kill_only_users = strv_free(m->kill_only_users);
  75         m->kill_exclude_users = strv_free(m->kill_exclude_users);
  76
  77         m->stop_idle_session_usec = USEC_INFINITY;
  78 }
  79
  80 int manager_parse_config_file(Manager *m) {
  81         assert(m);
  82
  83         return config_parse_config_file("logind.conf", "Login\0",
  84                                         config_item_perf_lookup, logind_gperf_lookup,
  85                                         CONFIG_PARSE_WARN, m);
  86 }
  87
  88 int manager_add_device(Manager *m, const char *sysfs, bool master, Device **ret_device) {
  89         Device *d;
  90
  91         assert(m);
  92         assert(sysfs);
  93
  94         d = hashmap_get(m->devices, sysfs);
  95         if (d)
  96                 /* we support adding master-flags, but not removing them */
  97                 d->master = d->master || master;
  98         else {
  99                 d = device_new(m, sysfs, master);
 100                 if (!d)
 101                         return -ENOMEM;
 102         }
 103
 104         if (ret_device)
 105                 *ret_device = d;
 106
 107         return 0;
 108 }
 109
 110 int manager_add_seat(Manager *m, const char *id, Seat **ret_seat) {
 111         Seat *s;
 112         int r;
 113
 114         assert(m);
 115         assert(id);
 116
 117         s = hashmap_get(m->seats, id);
 118         if (!s) {
 119                 r = seat_new(&s, m, id);
 120                 if (r < 0)
 121                         return r;
 122         }
 123
 124         if (ret_seat)
 125                 *ret_seat = s;
 126
 127         return 0;
 128 }
 129
 130 int manager_add_session(Manager *m, const char *id, Session **ret_session) {
 131         Session *s;
 132         int r;
 133
 134         assert(m);
 135         assert(id);
 136
 137         s = hashmap_get(m->sessions, id);
 138         if (!s) {
 139                 r = session_new(&s, m, id);
 140                 if (r < 0)
 141                         return r;
 142         }
 143
 144         if (ret_session)
 145                 *ret_session = s;
 146
 147         return 0;
 148 }
 149
 150 int manager_add_user(
 151                 Manager *m,
 152                 UserRecord *ur,
 153                 User **ret_user) {
 154
 155         User *u;
 156         int r;
 157
 158         assert(m);
 159         assert(ur);
 160
 161         u = hashmap_get(m->users, UID_TO_PTR(ur->uid));
 162         if (!u) {
 163                 r = user_new(&u, m, ur);
 164                 if (r < 0)
 165                         return r;
 166         }
 167
 168         if (ret_user)
 169                 *ret_user = u;
 170
 171         return 0;
 172 }
 173
 174 int manager_add_user_by_name(
 175                 Manager *m,
 176                 const char *name,
 177                 User **ret_user) {
 178
 179         _cleanup_(user_record_unrefp) UserRecord *ur = NULL;
 180         int r;
 181
 182         assert(m);
 183         assert(name);
 184
 185         r = userdb_by_name(name, USERDB_SUPPRESS_SHADOW, &ur);
 186         if (r < 0)
 187                 return r;
 188
 189         return manager_add_user(m, ur, ret_user);
 190 }
 191
 192 int manager_add_user_by_uid(
 193                 Manager *m,
 194                 uid_t uid,
 195                 User **ret_user) {
 196
 197         _cleanup_(user_record_unrefp) UserRecord *ur = NULL;
 198         int r;
 199
 200         assert(m);
 201         assert(uid_is_valid(uid));
 202
 203         r = userdb_by_uid(uid, USERDB_SUPPRESS_SHADOW, &ur);
 204         if (r < 0)
 205                 return r;
 206
 207         return manager_add_user(m, ur, ret_user);
 208 }
 209
 210 int manager_add_inhibitor(Manager *m, const char* id, Inhibitor **ret) {
 211         Inhibitor *i;
 212         int r;
 213
 214         assert(m);
 215         assert(id);
 216
 217         i = hashmap_get(m->inhibitors, id);
 218         if (!i) {
 219                 r = inhibitor_new(&i, m, id);
 220                 if (r < 0)
 221                         return r;
 222         }
 223
 224         if (ret)
 225                 *ret = i;
 226
 227         return 0;
 228 }
 229
 230 int manager_add_button(Manager *m, const char *name, Button **ret_button) {
 231         Button *b;
 232
 233         assert(m);
 234         assert(name);
 235
 236         b = hashmap_get(m->buttons, name);
 237         if (!b) {
 238                 b = button_new(m, name);
 239                 if (!b)
 240                         return -ENOMEM;
 241         }
 242
 243         if (ret_button)
 244                 *ret_button = b;
 245
 246         return 0;
 247 }
 248
 249 int manager_process_seat_device(Manager *m, sd_device *d) {
 250         Device *device;
 251         int r;
 252
 253         assert(m);
 254
 255         if (device_for_action(d, SD_DEVICE_REMOVE) ||
 256             sd_device_has_current_tag(d, "seat") <= 0) {
 257                 const char *syspath;
 258
 259                 r = sd_device_get_syspath(d, &syspath);
 260                 if (r < 0)
 261                         return 0;
 262
 263                 device = hashmap_get(m->devices, syspath);
 264                 if (!device)
 265                         return 0;
 266
 267                 seat_add_to_gc_queue(device->seat);
 268                 device_free(device);
 269
 270         } else {
 271                 const char *sn, *syspath;
 272                 bool master;
 273                 Seat *seat;
 274
 275                 if (sd_device_get_property_value(d, "ID_SEAT", &sn) < 0 || isempty(sn))
 276                         sn = "seat0";
 277
 278                 if (!seat_name_is_valid(sn)) {
 279                         log_device_warning(d, "Device with invalid seat name %s found, ignoring.", sn);
 280                         return 0;
 281                 }
 282
 283                 seat = hashmap_get(m->seats, sn);
 284                 master = sd_device_has_current_tag(d, "master-of-seat") > 0;
 285
 286                 /* Ignore non-master devices for unknown seats */
 287                 if (!master && !seat)
 288                         return 0;
 289
 290                 r = sd_device_get_syspath(d, &syspath);
 291                 if (r < 0)
 292                         return r;
 293
 294                 r = manager_add_device(m, syspath, master, &device);
 295                 if (r < 0)
 296                         return r;
 297
 298                 if (!seat) {
 299                         r = manager_add_seat(m, sn, &seat);
 300                         if (r < 0) {
 301                                 if (!device->seat)
 302                                         device_free(device);
 303
 304                                 return r;
 305                         }
 306                 }
 307
 308                 device_attach(device, seat);
 309                 seat_start(seat);
 310         }
 311
 312         return 0;
 313 }
 314
 315 int manager_process_button_device(Manager *m, sd_device *d) {
 316         const char *sysname;
 317         Button *b;
 318         int r;
 319
 320         assert(m);
 321
 322         r = sd_device_get_sysname(d, &sysname);
 323         if (r < 0)
 324                 return r;
 325
 326         if (device_for_action(d, SD_DEVICE_REMOVE) ||
 327             sd_device_has_current_tag(d, "power-switch") <= 0)
 328
 329                 button_free(hashmap_get(m->buttons, sysname));
 330
 331         else {
 332                 const char *sn;
 333
 334                 r = manager_add_button(m, sysname, &b);
 335                 if (r < 0)
 336                         return r;
 337
 338                 if (sd_device_get_property_value(d, "ID_SEAT", &sn) < 0 || isempty(sn))
 339                         sn = "seat0";
 340
 341                 button_set_seat(b, sn);
 342
 343                 r = button_open(b);
 344                 if (r < 0) /* event device doesn't have any keys or switches relevant to us? (or any other error
 345                             * opening the device?) let's close the button again. */
 346                         button_free(b);
 347         }
 348
 349         return 0;
 350 }
 351
 352 int manager_get_session_by_pid(Manager *m, pid_t pid, Session **ret) {
 353         _cleanup_free_ char *unit = NULL;
 354         Session *s;
 355         int r;
 356
 357         assert(m);
 358
 359         if (!pid_is_valid(pid))
 360                 return -EINVAL;
 361
 362         s = hashmap_get(m->sessions_by_leader, PID_TO_PTR(pid));
 363         if (!s) {
 364                 r = cg_pid_get_unit(pid, &unit);
 365                 if (r >= 0)
 366                         s = hashmap_get(m->session_units, unit);
 367         }
 368
 369         if (ret)
 370                 *ret = s;
 371
 372         return !!s;
 373 }
 374
 375 int manager_get_user_by_pid(Manager *m, pid_t pid, User **ret) {
 376         _cleanup_free_ char *unit = NULL;
 377         User *u = NULL;
 378         int r;
 379
 380         assert(m);
 381
 382         if (!pid_is_valid(pid))
 383                 return -EINVAL;
 384
 385         r = cg_pid_get_slice(pid, &unit);
 386         if (r >= 0)
 387                 u = hashmap_get(m->user_units, unit);
 388
 389         if (ret)
 390                 *ret = u;
 391
 392         return !!u;
 393 }
 394
 395 int manager_get_idle_hint(Manager *m, dual_timestamp *t) {
 396         Session *s;
 397         bool idle_hint;
 398         dual_timestamp ts = DUAL_TIMESTAMP_NULL;
 399
 400         assert(m);
 401
 402         idle_hint = !manager_is_inhibited(m, INHIBIT_IDLE, INHIBIT_BLOCK, t, false, false, 0, NULL);
 403
 404         HASHMAP_FOREACH(s, m->sessions) {
 405                 dual_timestamp k;
 406                 int ih;
 407
 408                 ih = session_get_idle_hint(s, &k);
 409                 if (ih < 0)
 410                         return ih;
 411
 412                 if (!ih) {
 413                         if (!idle_hint) {
 414                                 if (k.monotonic < ts.monotonic)
 415                                         ts = k;
 416                         } else {
 417                                 idle_hint = false;
 418                                 ts = k;
 419                         }
 420                 } else if (idle_hint) {
 421
 422                         if (k.monotonic > ts.monotonic)
 423                                 ts = k;
 424                 }
 425         }
 426
 427         if (t)
 428                 *t = ts;
 429
 430         return idle_hint;
 431 }
 432
 433 bool manager_shall_kill(Manager *m, const char *user) {
 434         assert(m);
 435         assert(user);
 436
 437         if (!m->kill_exclude_users && streq(user, "root"))
 438                 return false;
 439
 440         if (strv_contains(m->kill_exclude_users, user))
 441                 return false;
 442
 443         if (!strv_isempty(m->kill_only_users))
 444                 return strv_contains(m->kill_only_users, user);
 445
 446         return m->kill_user_processes;
 447 }
 448
 449 int config_parse_n_autovts(
 450                 const char *unit,
 451                 const char *filename,
 452                 unsigned line,
 453                 const char *section,
 454                 unsigned section_line,
 455                 const char *lvalue,
 456                 int ltype,
 457                 const char *rvalue,
 458                 void *data,
 459                 void *userdata) {
 460
 461         unsigned *n = ASSERT_PTR(data);
 462         unsigned o;
 463         int r;
 464
 465         assert(filename);
 466         assert(lvalue);
 467         assert(rvalue);
 468
 469         r = safe_atou(rvalue, &o);
 470         if (r < 0) {
 471                 log_syntax(unit, LOG_WARNING, filename, line, r,
 472                            "Failed to parse number of autovts, ignoring: %s", rvalue);
 473                 return 0;
 474         }
 475
 476         if (o > 15) {
 477                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 478                            "A maximum of 15 autovts are supported, ignoring: %s", rvalue);
 479                 return 0;
 480         }
 481
 482         *n = o;
 483         return 0;
 484 }
 485
 486 static int vt_is_busy(unsigned vtnr) {
 487         struct vt_stat vt_stat;
 488         int r;
 489         _cleanup_close_ int fd = -EBADF;
 490
 491         assert(vtnr >= 1);
 492
 493         /* VT_GETSTATE "cannot return state for more than 16 VTs, since v_state is short" */
 494         assert(vtnr <= 15);
 495
 496         /* We explicitly open /dev/tty1 here instead of /dev/tty0. If
 497          * we'd open the latter we'd open the foreground tty which
 498          * hence would be unconditionally busy. By opening /dev/tty1
 499          * we avoid this. Since tty1 is special and needs to be an
 500          * explicitly loaded getty or DM this is safe. */
 501
 502         fd = open_terminal("/dev/tty1", O_RDWR|O_NOCTTY|O_CLOEXEC);
 503         if (fd < 0)
 504                 return -errno;
 505
 506         if (ioctl(fd, VT_GETSTATE, &vt_stat) < 0)
 507                 r = -errno;
 508         else
 509                 r = !!(vt_stat.v_state & (1 << vtnr));
 510
 511         return r;
 512 }
 513
 514 int manager_spawn_autovt(Manager *m, unsigned vtnr) {
 515         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 516         char name[sizeof("autovt@tty.service") + DECIMAL_STR_MAX(unsigned)];
 517         int r;
 518
 519         assert(m);
 520         assert(vtnr >= 1);
 521
 522         if (vtnr > m->n_autovts &&
 523             vtnr != m->reserve_vt)
 524                 return 0;
 525
 526         if (vtnr != m->reserve_vt) {
 527                 /* If this is the reserved TTY, we'll start the getty
 528                  * on it in any case, but otherwise only if it is not
 529                  * busy. */
 530
 531                 r = vt_is_busy(vtnr);
 532                 if (r < 0)
 533                         return r;
 534                 else if (r > 0)
 535                         return -EBUSY;
 536         }
 537
 538         xsprintf(name, "autovt@tty%u.service", vtnr);
 539         r = bus_call_method(m->bus, bus_systemd_mgr, "StartUnit", &error, NULL, "ss", name, "fail");
 540         if (r < 0)
 541                 return log_error_errno(r, "Failed to start %s: %s", name, bus_error_message(&error, r));
 542
 543         return 0;
 544 }
 545
 546 bool manager_is_lid_closed(Manager *m) {
 547         Button *b;
 548
 549         HASHMAP_FOREACH(b, m->buttons)
 550                 if (b->lid_closed)
 551                         return true;
 552
 553         return false;
 554 }
 555
 556 static bool manager_is_docked(Manager *m) {
 557         Button *b;
 558
 559         HASHMAP_FOREACH(b, m->buttons)
 560                 if (b->docked)
 561                         return true;
 562
 563         return false;
 564 }
 565
 566 static int manager_count_external_displays(Manager *m) {
 567         _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
 568         sd_device *d;
 569         int r, n = 0;
 570
 571         r = sd_device_enumerator_new(&e);
 572         if (r < 0)
 573                 return r;
 574
 575         r = sd_device_enumerator_allow_uninitialized(e);
 576         if (r < 0)
 577                 return r;
 578
 579         r = sd_device_enumerator_add_match_subsystem(e, "drm", true);
 580         if (r < 0)
 581                 return r;
 582
 583         FOREACH_DEVICE(e, d) {
 584                 const char *status, *enabled, *dash, *nn, *subsys;
 585                 sd_device *p;
 586
 587                 if (sd_device_get_parent(d, &p) < 0)
 588                         continue;
 589
 590                 /* If the parent shares the same subsystem as the
 591                  * device we are looking at then it is a connector,
 592                  * which is what we are interested in. */
 593                 if (sd_device_get_subsystem(p, &subsys) < 0 || !streq(subsys, "drm"))
 594                         continue;
 595
 596                 if (sd_device_get_sysname(d, &nn) < 0)
 597                         continue;
 598
 599                 /* Ignore internal displays: the type is encoded in the sysfs name, as the second dash
 600                  * separated item (the first is the card name, the last the connector number). We implement a
 601                  * deny list of external displays here, rather than an allow list of internal ones, to ensure
 602                  * we don't block suspends too eagerly. */
 603                 dash = strchr(nn, '-');
 604                 if (!dash)
 605                         continue;
 606
 607                 dash++;
 608                 if (!STARTSWITH_SET(dash,
 609                                     "VGA-", "DVI-I-", "DVI-D-", "DVI-A-"
 610                                     "Composite-", "SVIDEO-", "Component-",
 611                                     "DIN-", "DP-", "HDMI-A-", "HDMI-B-", "TV-"))
 612                         continue;
 613
 614                 /* Ignore ports that are not enabled */
 615                 if (sd_device_get_sysattr_value(d, "enabled", &enabled) < 0 || !streq(enabled, "enabled"))
 616                         continue;
 617
 618                 /* We count any connector which is not explicitly
 619                  * "disconnected" as connected. */
 620                 if (sd_device_get_sysattr_value(d, "status", &status) < 0 || !streq(status, "disconnected"))
 621                         n++;
 622         }
 623
 624         return n;
 625 }
 626
 627 bool manager_is_docked_or_external_displays(Manager *m) {
 628         int n;
 629
 630         /* If we are docked don't react to lid closing */
 631         if (manager_is_docked(m)) {
 632                 log_debug("System is docked.");
 633                 return true;
 634         }
 635
 636         /* If we have more than one display connected,
 637          * assume that we are docked. */
 638         n = manager_count_external_displays(m);
 639         if (n < 0)
 640                 log_warning_errno(n, "Display counting failed: %m");
 641         else if (n >= 1) {
 642                 log_debug("External (%i) displays connected.", n);
 643                 return true;
 644         }
 645
 646         return false;
 647 }
 648
 649 bool manager_is_on_external_power(void) {
 650         int r;
 651
 652         /* For now we only check for AC power, but 'external power' can apply to anything that isn't an internal
 653          * battery */
 654         r = on_ac_power();
 655         if (r < 0)
 656                 log_warning_errno(r, "Failed to read AC power status: %m");
 657
 658         return r != 0; /* Treat failure as 'on AC' */
 659 }
 660
 661 bool manager_all_buttons_ignored(Manager *m) {
 662         assert(m);
 663
 664         if (m->handle_power_key != HANDLE_IGNORE)
 665                 return false;
 666         if (m->handle_power_key_long_press != HANDLE_IGNORE)
 667                 return false;
 668         if (m->handle_suspend_key != HANDLE_IGNORE)
 669                 return false;
 670         if (m->handle_suspend_key_long_press != HANDLE_IGNORE)
 671                 return false;
 672         if (m->handle_hibernate_key != HANDLE_IGNORE)
 673                 return false;
 674         if (m->handle_hibernate_key_long_press != HANDLE_IGNORE)
 675                 return false;
 676         if (m->handle_reboot_key != HANDLE_IGNORE)
 677                 return false;
 678         if (m->handle_reboot_key_long_press != HANDLE_IGNORE)
 679                 return false;
 680         if (m->handle_lid_switch != HANDLE_IGNORE)
 681                 return false;
 682         if (!IN_SET(m->handle_lid_switch_ep, _HANDLE_ACTION_INVALID, HANDLE_IGNORE))
 683                 return false;
 684         if (m->handle_lid_switch_docked != HANDLE_IGNORE)
 685                 return false;
 686
 687         return true;
 688 }
 689
 690 int manager_read_utmp(Manager *m) {
 691 #if ENABLE_UTMP
 692         int r;
 693         _unused_ _cleanup_(utxent_cleanup) bool utmpx = false;
 694
 695         assert(m);
 696
 697         if (utmpxname(_PATH_UTMPX) < 0)
 698                 return log_error_errno(errno, "Failed to set utmp path to " _PATH_UTMPX ": %m");
 699
 700         utmpx = utxent_start();
 701
 702         for (;;) {
 703                 _cleanup_free_ char *t = NULL;
 704                 struct utmpx *u;
 705                 const char *c;
 706                 Session *s;
 707
 708                 errno = 0;
 709                 u = getutxent();
 710                 if (!u) {
 711                         if (errno == ENOENT)
 712                                 log_debug_errno(errno, _PATH_UTMPX " does not exist, ignoring.");
 713                         else if (errno != 0)
 714                                 log_warning_errno(errno, "Failed to read " _PATH_UTMPX ", ignoring: %m");
 715                         return 0;
 716                 }
 717
 718                 if (u->ut_type != USER_PROCESS)
 719                         continue;
 720
 721                 if (!pid_is_valid(u->ut_pid))
 722                         continue;
 723
 724                 t = strndup(u->ut_line, sizeof(u->ut_line));
 725                 if (!t)
 726                         return log_oom();
 727
 728                 c = path_startswith(t, "/dev/");
 729                 if (c) {
 730                         r = free_and_strdup(&t, c);
 731                         if (r < 0)
 732                                 return log_oom();
 733                 }
 734
 735                 if (isempty(t))
 736                         continue;
 737
 738                 s = hashmap_get(m->sessions_by_leader, PID_TO_PTR(u->ut_pid));
 739                 if (!s)
 740                         continue;
 741
 742                 if (s->tty_validity == TTY_FROM_UTMP && !streq_ptr(s->tty, t)) {
 743                         /* This may happen on multiplexed SSH connection (i.e. 'SSH connection sharing'). In
 744                          * this case PAM and utmp sessions don't match. In such a case let's invalidate the TTY
 745                          * information and never acquire it again. */
 746
 747                         s->tty = mfree(s->tty);
 748                         s->tty_validity = TTY_UTMP_INCONSISTENT;
 749                         log_debug("Session '%s' has inconsistent TTY information, dropping TTY information.", s->id);
 750                         continue;
 751                 }
 752
 753                 /* Never override what we figured out once */
 754                 if (s->tty || s->tty_validity >= 0)
 755                         continue;
 756
 757                 s->tty = TAKE_PTR(t);
 758                 s->tty_validity = TTY_FROM_UTMP;
 759                 log_debug("Acquired TTY information '%s' from utmp for session '%s'.", s->tty, s->id);
 760         }
 761
 762 #else
 763         return 0;
 764 #endif
 765 }
 766
 767 #if ENABLE_UTMP
 768 static int manager_dispatch_utmp(sd_event_source *s, const struct inotify_event *event, void *userdata) {
 769         Manager *m = ASSERT_PTR(userdata);
 770
 771         /* If there's indication the file itself might have been removed or became otherwise unavailable, then let's
 772          * reestablish the watch on whatever there's now. */
 773         if ((event->mask & (IN_ATTRIB|IN_DELETE_SELF|IN_MOVE_SELF|IN_Q_OVERFLOW|IN_UNMOUNT)) != 0)
 774                 manager_connect_utmp(m);
 775
 776         (void) manager_read_utmp(m);
 777         return 0;
 778 }
 779 #endif
 780
 781 void manager_connect_utmp(Manager *m) {
 782 #if ENABLE_UTMP
 783         sd_event_source *s = NULL;
 784         int r;
 785
 786         assert(m);
 787
 788         /* Watch utmp for changes via inotify. We do this to deal with tools such as ssh, which will register the PAM
 789          * session early, and acquire a TTY only much later for the connection. Thus during PAM the TTY won't be known
 790          * yet. ssh will register itself with utmp when it finally acquired the TTY. Hence, let's make use of this, and
 791          * watch utmp for the TTY asynchronously. We use the PAM session's leader PID as key, to find the right entry.
 792          *
 793          * Yes, relying on utmp is pretty ugly, but it's good enough for informational purposes, as well as idle
 794          * detection (which, for tty sessions, relies on the TTY used) */
 795
 796         r = sd_event_add_inotify(m->event, &s, _PATH_UTMPX, IN_MODIFY|IN_MOVE_SELF|IN_DELETE_SELF|IN_ATTRIB, manager_dispatch_utmp, m);
 797         if (r < 0)
 798                 log_full_errno(r == -ENOENT ? LOG_DEBUG: LOG_WARNING, r, "Failed to create inotify watch on " _PATH_UTMPX ", ignoring: %m");
 799         else {
 800                 r = sd_event_source_set_priority(s, SD_EVENT_PRIORITY_IDLE);
 801                 if (r < 0)
 802                         log_warning_errno(r, "Failed to adjust utmp event source priority, ignoring: %m");
 803
 804                 (void) sd_event_source_set_description(s, "utmp");
 805         }
 806
 807         sd_event_source_unref(m->utmp_event_source);
 808         m->utmp_event_source = s;
 809 #endif
 810 }
 811
 812 void manager_reconnect_utmp(Manager *m) {
 813 #if ENABLE_UTMP
 814         assert(m);
 815
 816         if (m->utmp_event_source)
 817                 return;
 818
 819         manager_connect_utmp(m);
 820 #endif
 821 }
 822
 823 int manager_read_efi_boot_loader_entries(Manager *m) {
 824 #if ENABLE_EFI
 825         int r;
 826
 827         assert(m);
 828         if (m->efi_boot_loader_entries_set)
 829                 return 0;
 830
 831         r = efi_loader_get_entries(&m->efi_boot_loader_entries);
 832         if (r == -ENOENT || ERRNO_IS_NOT_SUPPORTED(r)) {
 833                 log_debug_errno(r, "Boot loader reported no entries.");
 834                 m->efi_boot_loader_entries_set = true;
 835                 return 0;
 836         }
 837         if (r < 0)
 838                 return log_error_errno(r, "Failed to determine entries reported by boot loader: %m");
 839
 840         m->efi_boot_loader_entries_set = true;
 841         return 1;
 842 #else
 843         return 0;
 844 #endif
 845 }