src/login/logind-user.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2
   3 #include <errno.h>
   4 #include <string.h>
   5 #include <unistd.h>
   6 #include <stdio_ext.h>
   7
   8 #include "alloc-util.h"
   9 #include "bus-common-errors.h"
  10 #include "bus-error.h"
  11 #include "bus-util.h"
  12 #include "cgroup-util.h"
  13 #include "clean-ipc.h"
  14 #include "escape.h"
  15 #include "fd-util.h"
  16 #include "fileio.h"
  17 #include "format-util.h"
  18 #include "fs-util.h"
  19 #include "hashmap.h"
  20 #include "label.h"
  21 #include "logind-user.h"
  22 #include "mkdir.h"
  23 #include "parse-util.h"
  24 #include "path-util.h"
  25 #include "rm-rf.h"
  26 #include "serialize.h"
  27 #include "special.h"
  28 #include "stdio-util.h"
  29 #include "string-table.h"
  30 #include "strv.h"
  31 #include "tmpfile-util.h"
  32 #include "unit-name.h"
  33 #include "user-util.h"
  34 #include "util.h"
  35
  36 int user_new(User **ret,
  37              Manager *m,
  38              uid_t uid,
  39              gid_t gid,
  40              const char *name,
  41              const char *home) {
  42
  43         _cleanup_(user_freep) User *u = NULL;
  44         char lu[DECIMAL_STR_MAX(uid_t) + 1];
  45         int r;
  46
  47         assert(ret);
  48         assert(m);
  49         assert(name);
  50
  51         u = new(User, 1);
  52         if (!u)
  53                 return -ENOMEM;
  54
  55         *u = (User) {
  56                 .manager = m,
  57                 .uid = uid,
  58                 .gid = gid,
  59                 .last_session_timestamp = USEC_INFINITY,
  60         };
  61
  62         u->name = strdup(name);
  63         if (!u->name)
  64                 return -ENOMEM;
  65
  66         u->home = strdup(home);
  67         if (!u->home)
  68                 return -ENOMEM;
  69
  70         if (asprintf(&u->state_file, "/run/systemd/users/"UID_FMT, uid) < 0)
  71                 return -ENOMEM;
  72
  73         if (asprintf(&u->runtime_path, "/run/user/"UID_FMT, uid) < 0)
  74                 return -ENOMEM;
  75
  76         xsprintf(lu, UID_FMT, uid);
  77         r = slice_build_subslice(SPECIAL_USER_SLICE, lu, &u->slice);
  78         if (r < 0)
  79                 return r;
  80
  81         r = unit_name_build("user", lu, ".service", &u->service);
  82         if (r < 0)
  83                 return r;
  84
  85         r = unit_name_build("user-runtime-dir", lu, ".service", &u->runtime_dir_service);
  86         if (r < 0)
  87                 return r;
  88
  89         r = hashmap_put(m->users, UID_TO_PTR(uid), u);
  90         if (r < 0)
  91                 return r;
  92
  93         r = hashmap_put(m->user_units, u->slice, u);
  94         if (r < 0)
  95                 return r;
  96
  97         r = hashmap_put(m->user_units, u->service, u);
  98         if (r < 0)
  99                 return r;
 100
 101         r = hashmap_put(m->user_units, u->runtime_dir_service, u);
 102         if (r < 0)
 103                 return r;
 104
 105         *ret = TAKE_PTR(u);
 106         return 0;
 107 }
 108
 109 User *user_free(User *u) {
 110         if (!u)
 111                 return NULL;
 112
 113         if (u->in_gc_queue)
 114                 LIST_REMOVE(gc_queue, u->manager->user_gc_queue, u);
 115
 116         while (u->sessions)
 117                 session_free(u->sessions);
 118
 119         if (u->service)
 120                 hashmap_remove_value(u->manager->user_units, u->service, u);
 121
 122         if (u->runtime_dir_service)
 123                 hashmap_remove_value(u->manager->user_units, u->runtime_dir_service, u);
 124
 125         if (u->slice)
 126                 hashmap_remove_value(u->manager->user_units, u->slice, u);
 127
 128         hashmap_remove_value(u->manager->users, UID_TO_PTR(u->uid), u);
 129
 130         (void) sd_event_source_unref(u->timer_event_source);
 131
 132         u->service_job = mfree(u->service_job);
 133
 134         u->service = mfree(u->service);
 135         u->runtime_dir_service = mfree(u->runtime_dir_service);
 136         u->slice = mfree(u->slice);
 137         u->runtime_path = mfree(u->runtime_path);
 138         u->state_file = mfree(u->state_file);
 139         u->name = mfree(u->name);
 140         u->home = mfree(u->home);
 141
 142         return mfree(u);
 143 }
 144
 145 static int user_save_internal(User *u) {
 146         _cleanup_free_ char *temp_path = NULL;
 147         _cleanup_fclose_ FILE *f = NULL;
 148         int r;
 149
 150         assert(u);
 151         assert(u->state_file);
 152
 153         r = mkdir_safe_label("/run/systemd/users", 0755, 0, 0, MKDIR_WARN_MODE);
 154         if (r < 0)
 155                 goto fail;
 156
 157         r = fopen_temporary(u->state_file, &f, &temp_path);
 158         if (r < 0)
 159                 goto fail;
 160
 161         (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
 162         (void) fchmod(fileno(f), 0644);
 163
 164         fprintf(f,
 165                 "# This is private data. Do not parse.\n"
 166                 "NAME=%s\n"
 167                 "STATE=%s\n"         /* friendly user-facing state */
 168                 "STOPPING=%s\n",     /* low-level state */
 169                 u->name,
 170                 user_state_to_string(user_get_state(u)),
 171                 yes_no(u->stopping));
 172
 173         /* LEGACY: no-one reads RUNTIME= anymore, drop it at some point */
 174         if (u->runtime_path)
 175                 fprintf(f, "RUNTIME=%s\n", u->runtime_path);
 176
 177         if (u->service_job)
 178                 fprintf(f, "SERVICE_JOB=%s\n", u->service_job);
 179
 180         if (u->display)
 181                 fprintf(f, "DISPLAY=%s\n", u->display->id);
 182
 183         if (dual_timestamp_is_set(&u->timestamp))
 184                 fprintf(f,
 185                         "REALTIME="USEC_FMT"\n"
 186                         "MONOTONIC="USEC_FMT"\n",
 187                         u->timestamp.realtime,
 188                         u->timestamp.monotonic);
 189
 190         if (u->last_session_timestamp != USEC_INFINITY)
 191                 fprintf(f, "LAST_SESSION_TIMESTAMP=" USEC_FMT "\n",
 192                         u->last_session_timestamp);
 193
 194         if (u->sessions) {
 195                 Session *i;
 196                 bool first;
 197
 198                 fputs("SESSIONS=", f);
 199                 first = true;
 200                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 201                         if (first)
 202                                 first = false;
 203                         else
 204                                 fputc(' ', f);
 205
 206                         fputs(i->id, f);
 207                 }
 208
 209                 fputs("\nSEATS=", f);
 210                 first = true;
 211                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 212                         if (!i->seat)
 213                                 continue;
 214
 215                         if (first)
 216                                 first = false;
 217                         else
 218                                 fputc(' ', f);
 219
 220                         fputs(i->seat->id, f);
 221                 }
 222
 223                 fputs("\nACTIVE_SESSIONS=", f);
 224                 first = true;
 225                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 226                         if (!session_is_active(i))
 227                                 continue;
 228
 229                         if (first)
 230                                 first = false;
 231                         else
 232                                 fputc(' ', f);
 233
 234                         fputs(i->id, f);
 235                 }
 236
 237                 fputs("\nONLINE_SESSIONS=", f);
 238                 first = true;
 239                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 240                         if (session_get_state(i) == SESSION_CLOSING)
 241                                 continue;
 242
 243                         if (first)
 244                                 first = false;
 245                         else
 246                                 fputc(' ', f);
 247
 248                         fputs(i->id, f);
 249                 }
 250
 251                 fputs("\nACTIVE_SEATS=", f);
 252                 first = true;
 253                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 254                         if (!session_is_active(i) || !i->seat)
 255                                 continue;
 256
 257                         if (first)
 258                                 first = false;
 259                         else
 260                                 fputc(' ', f);
 261
 262                         fputs(i->seat->id, f);
 263                 }
 264
 265                 fputs("\nONLINE_SEATS=", f);
 266                 first = true;
 267                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 268                         if (session_get_state(i) == SESSION_CLOSING || !i->seat)
 269                                 continue;
 270
 271                         if (first)
 272                                 first = false;
 273                         else
 274                                 fputc(' ', f);
 275
 276                         fputs(i->seat->id, f);
 277                 }
 278                 fputc('\n', f);
 279         }
 280
 281         r = fflush_and_check(f);
 282         if (r < 0)
 283                 goto fail;
 284
 285         if (rename(temp_path, u->state_file) < 0) {
 286                 r = -errno;
 287                 goto fail;
 288         }
 289
 290         return 0;
 291
 292 fail:
 293         (void) unlink(u->state_file);
 294
 295         if (temp_path)
 296                 (void) unlink(temp_path);
 297
 298         return log_error_errno(r, "Failed to save user data %s: %m", u->state_file);
 299 }
 300
 301 int user_save(User *u) {
 302         assert(u);
 303
 304         if (!u->started)
 305                 return 0;
 306
 307         return user_save_internal(u);
 308 }
 309
 310 int user_load(User *u) {
 311         _cleanup_free_ char *realtime = NULL, *monotonic = NULL, *stopping = NULL, *last_session_timestamp = NULL;
 312         int r;
 313
 314         assert(u);
 315
 316         r = parse_env_file(NULL, u->state_file,
 317                            "SERVICE_JOB",            &u->service_job,
 318                            "STOPPING",               &stopping,
 319                            "REALTIME",               &realtime,
 320                            "MONOTONIC",              &monotonic,
 321                            "LAST_SESSION_TIMESTAMP", &last_session_timestamp);
 322         if (r == -ENOENT)
 323                 return 0;
 324         if (r < 0)
 325                 return log_error_errno(r, "Failed to read %s: %m", u->state_file);
 326
 327         if (stopping) {
 328                 r = parse_boolean(stopping);
 329                 if (r < 0)
 330                         log_debug_errno(r, "Failed to parse 'STOPPING' boolean: %s", stopping);
 331                 else
 332                         u->stopping = r;
 333         }
 334
 335         if (realtime)
 336                 (void) deserialize_usec(realtime, &u->timestamp.realtime);
 337         if (monotonic)
 338                 (void) deserialize_usec(monotonic, &u->timestamp.monotonic);
 339         if (last_session_timestamp)
 340                 (void) deserialize_usec(last_session_timestamp, &u->last_session_timestamp);
 341
 342         return 0;
 343 }
 344
 345 static void user_start_service(User *u) {
 346         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 347         int r;
 348
 349         assert(u);
 350
 351         /* Start the service containing the "systemd --user" instance (user@.service). Note that we don't explicitly
 352          * start the per-user slice or the systemd-runtime-dir@.service instance, as those are pulled in both by
 353          * user@.service and the session scopes as dependencies. */
 354
 355         u->service_job = mfree(u->service_job);
 356
 357         r = manager_start_unit(u->manager, u->service, &error, &u->service_job);
 358         if (r < 0)
 359                 log_warning_errno(r, "Failed to start user service '%s', ignoring: %s", u->service, bus_error_message(&error, r));
 360 }
 361
 362 int user_start(User *u) {
 363         assert(u);
 364
 365         if (u->started && !u->stopping)
 366                 return 0;
 367
 368         /* If u->stopping is set, the user is marked for removal and service stop-jobs are queued. We have to clear
 369          * that flag before queing the start-jobs again. If they succeed, the user object can be re-used just fine
 370          * (pid1 takes care of job-ordering and proper restart), but if they fail, we want to force another user_stop()
 371          * so possibly pending units are stopped. */
 372         u->stopping = false;
 373
 374         if (!u->started)
 375                 log_debug("Starting services for new user %s.", u->name);
 376
 377         /* Save the user data so far, because pam_systemd will read the XDG_RUNTIME_DIR out of it while starting up
 378          * systemd --user.  We need to do user_save_internal() because we have not "officially" started yet. */
 379         user_save_internal(u);
 380
 381         /* Start user@UID.service */
 382         user_start_service(u);
 383
 384         if (!u->started) {
 385                 if (!dual_timestamp_is_set(&u->timestamp))
 386                         dual_timestamp_get(&u->timestamp);
 387                 user_send_signal(u, true);
 388                 u->started = true;
 389         }
 390
 391         /* Save new user data */
 392         user_save(u);
 393
 394         return 0;
 395 }
 396
 397 static void user_stop_service(User *u) {
 398         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 399         int r;
 400
 401         assert(u);
 402         assert(u->service);
 403
 404         /* The reverse of user_start_service(). Note that we only stop user@UID.service here, and let StopWhenUnneeded=
 405          * deal with the slice and the user-runtime-dir@.service instance. */
 406
 407         u->service_job = mfree(u->service_job);
 408
 409         r = manager_stop_unit(u->manager, u->service, &error, &u->service_job);
 410         if (r < 0)
 411                 log_warning_errno(r, "Failed to stop user service '%s', ignoring: %s", u->service, bus_error_message(&error, r));
 412 }
 413
 414 int user_stop(User *u, bool force) {
 415         Session *s;
 416         int r = 0;
 417         assert(u);
 418
 419         /* This is called whenever we begin with tearing down a user record. It's called in two cases: explicit API
 420          * request to do so via the bus (in which case 'force' is true) and automatically due to GC, if there's no
 421          * session left pinning it (in which case 'force' is false). Note that this just initiates tearing down of the
 422          * user, the User object will remain in memory until user_finalize() is called, see below. */
 423
 424         if (!u->started)
 425                 return 0;
 426
 427         if (u->stopping) { /* Stop jobs have already been queued */
 428                 user_save(u);
 429                 return 0;
 430         }
 431
 432         LIST_FOREACH(sessions_by_user, s, u->sessions) {
 433                 int k;
 434
 435                 k = session_stop(s, force);
 436                 if (k < 0)
 437                         r = k;
 438         }
 439
 440         user_stop_service(u);
 441
 442         u->stopping = true;
 443
 444         user_save(u);
 445
 446         return r;
 447 }
 448
 449 int user_finalize(User *u) {
 450         Session *s;
 451         int r = 0, k;
 452
 453         assert(u);
 454
 455         /* Called when the user is really ready to be freed, i.e. when all unit stop jobs and suchlike for it are
 456          * done. This is called as a result of an earlier user_done() when all jobs are completed. */
 457
 458         if (u->started)
 459                 log_debug("User %s logged out.", u->name);
 460
 461         LIST_FOREACH(sessions_by_user, s, u->sessions) {
 462                 k = session_finalize(s);
 463                 if (k < 0)
 464                         r = k;
 465         }
 466
 467         /* Clean SysV + POSIX IPC objects, but only if this is not a system user. Background: in many setups cronjobs
 468          * are run in full PAM and thus logind sessions, even if the code run doesn't belong to actual users but to
 469          * system components. Since enable RemoveIPC= globally for all users, we need to be a bit careful with such
 470          * cases, as we shouldn't accidentally remove a system service's IPC objects while it is running, just because
 471          * a cronjob running as the same user just finished. Hence: exclude system users generally from IPC clean-up,
 472          * and do it only for normal users. */
 473         if (u->manager->remove_ipc && !uid_is_system(u->uid)) {
 474                 k = clean_ipc_by_uid(u->uid);
 475                 if (k < 0)
 476                         r = k;
 477         }
 478
 479         (void) unlink(u->state_file);
 480         user_add_to_gc_queue(u);
 481
 482         if (u->started) {
 483                 user_send_signal(u, false);
 484                 u->started = false;
 485         }
 486
 487         return r;
 488 }
 489
 490 int user_get_idle_hint(User *u, dual_timestamp *t) {
 491         Session *s;
 492         bool idle_hint = true;
 493         dual_timestamp ts = DUAL_TIMESTAMP_NULL;
 494
 495         assert(u);
 496
 497         LIST_FOREACH(sessions_by_user, s, u->sessions) {
 498                 dual_timestamp k;
 499                 int ih;
 500
 501                 ih = session_get_idle_hint(s, &k);
 502                 if (ih < 0)
 503                         return ih;
 504
 505                 if (!ih) {
 506                         if (!idle_hint) {
 507                                 if (k.monotonic < ts.monotonic)
 508                                         ts = k;
 509                         } else {
 510                                 idle_hint = false;
 511                                 ts = k;
 512                         }
 513                 } else if (idle_hint) {
 514
 515                         if (k.monotonic > ts.monotonic)
 516                                 ts = k;
 517                 }
 518         }
 519
 520         if (t)
 521                 *t = ts;
 522
 523         return idle_hint;
 524 }
 525
 526 int user_check_linger_file(User *u) {
 527         _cleanup_free_ char *cc = NULL;
 528         char *p = NULL;
 529
 530         cc = cescape(u->name);
 531         if (!cc)
 532                 return -ENOMEM;
 533
 534         p = strjoina("/var/lib/systemd/linger/", cc);
 535         if (access(p, F_OK) < 0) {
 536                 if (errno != ENOENT)
 537                         return -errno;
 538
 539                 return false;
 540         }
 541
 542         return true;
 543 }
 544
 545 static bool user_unit_active(User *u) {
 546         const char *i;
 547         int r;
 548
 549         assert(u->service);
 550         assert(u->runtime_dir_service);
 551         assert(u->slice);
 552
 553         FOREACH_STRING(i, u->service, u->runtime_dir_service, u->slice) {
 554                 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 555
 556                 r = manager_unit_is_active(u->manager, i, &error);
 557                 if (r < 0)
 558                         log_debug_errno(r, "Failed to determine whether unit '%s' is active, ignoring: %s", u->service, bus_error_message(&error, r));
 559                 if (r != 0)
 560                         return true;
 561         }
 562
 563         return false;
 564 }
 565
 566 bool user_may_gc(User *u, bool drop_not_started) {
 567         int r;
 568
 569         assert(u);
 570
 571         if (drop_not_started && !u->started)
 572                 return true;
 573
 574         if (u->sessions)
 575                 return false;
 576
 577         if (u->last_session_timestamp != USEC_INFINITY) {
 578                 /* All sessions have been closed. Let's see if we shall leave the user record around for a bit */
 579
 580                 if (u->manager->user_stop_delay == USEC_INFINITY)
 581                         return false; /* Leave it around forever! */
 582                 if (u->manager->user_stop_delay > 0 &&
 583                     now(CLOCK_MONOTONIC) < usec_add(u->last_session_timestamp, u->manager->user_stop_delay))
 584                         return false; /* Leave it around for a bit longer. */
 585         }
 586
 587         /* Is this a user that shall stay around forever ("linger")? Before we say "no" to GC'ing for lingering users, let's check
 588          * if any of the three units that we maintain for this user is still around. If none of them is,
 589          * there's no need to keep this user around even if lingering is enabled. */
 590         if (user_check_linger_file(u) > 0 && user_unit_active(u))
 591                 return false;
 592
 593         /* Check if our job is still pending */
 594         if (u->service_job) {
 595                 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 596
 597                 r = manager_job_is_active(u->manager, u->service_job, &error);
 598                 if (r < 0)
 599                         log_debug_errno(r, "Failed to determine whether job '%s' is pending, ignoring: %s", u->service_job, bus_error_message(&error, r));
 600                 if (r != 0)
 601                         return false;
 602         }
 603
 604         /* Note that we don't care if the three units we manage for each user object are up or not, as we are managing
 605          * their state rather than tracking it. */
 606
 607         return true;
 608 }
 609
 610 void user_add_to_gc_queue(User *u) {
 611         assert(u);
 612
 613         if (u->in_gc_queue)
 614                 return;
 615
 616         LIST_PREPEND(gc_queue, u->manager->user_gc_queue, u);
 617         u->in_gc_queue = true;
 618 }
 619
 620 UserState user_get_state(User *u) {
 621         Session *i;
 622
 623         assert(u);
 624
 625         if (u->stopping)
 626                 return USER_CLOSING;
 627
 628         if (!u->started || u->service_job)
 629                 return USER_OPENING;
 630
 631         if (u->sessions) {
 632                 bool all_closing = true;
 633
 634                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 635                         SessionState state;
 636
 637                         state = session_get_state(i);
 638                         if (state == SESSION_ACTIVE)
 639                                 return USER_ACTIVE;
 640                         if (state != SESSION_CLOSING)
 641                                 all_closing = false;
 642                 }
 643
 644                 return all_closing ? USER_CLOSING : USER_ONLINE;
 645         }
 646
 647         if (user_check_linger_file(u) > 0 && user_unit_active(u))
 648                 return USER_LINGERING;
 649
 650         return USER_CLOSING;
 651 }
 652
 653 int user_kill(User *u, int signo) {
 654         assert(u);
 655
 656         return manager_kill_unit(u->manager, u->slice, KILL_ALL, signo, NULL);
 657 }
 658
 659 static bool elect_display_filter(Session *s) {
 660         /* Return true if the session is a candidate for the user’s ‘primary session’ or ‘display’. */
 661         assert(s);
 662
 663         return s->class == SESSION_USER && s->started && !s->stopping;
 664 }
 665
 666 static int elect_display_compare(Session *s1, Session *s2) {
 667         /* Indexed by SessionType. Lower numbers mean more preferred. */
 668         const int type_ranks[_SESSION_TYPE_MAX] = {
 669                 [SESSION_UNSPECIFIED] = 0,
 670                 [SESSION_TTY] = -2,
 671                 [SESSION_X11] = -3,
 672                 [SESSION_WAYLAND] = -3,
 673                 [SESSION_MIR] = -3,
 674                 [SESSION_WEB] = -1,
 675         };
 676
 677         /* Calculate the partial order relationship between s1 and s2,
 678          * returning < 0 if s1 is preferred as the user’s ‘primary session’,
 679          * 0 if s1 and s2 are equally preferred or incomparable, or > 0 if s2
 680          * is preferred.
 681          *
 682          * s1 or s2 may be NULL. */
 683         if (!s1 && !s2)
 684                 return 0;
 685
 686         if ((s1 == NULL) != (s2 == NULL))
 687                 return (s1 == NULL) - (s2 == NULL);
 688
 689         if (s1->stopping != s2->stopping)
 690                 return s1->stopping - s2->stopping;
 691
 692         if ((s1->class != SESSION_USER) != (s2->class != SESSION_USER))
 693                 return (s1->class != SESSION_USER) - (s2->class != SESSION_USER);
 694
 695         if ((s1->type == _SESSION_TYPE_INVALID) != (s2->type == _SESSION_TYPE_INVALID))
 696                 return (s1->type == _SESSION_TYPE_INVALID) - (s2->type == _SESSION_TYPE_INVALID);
 697
 698         if (s1->type != s2->type)
 699                 return type_ranks[s1->type] - type_ranks[s2->type];
 700
 701         return 0;
 702 }
 703
 704 void user_elect_display(User *u) {
 705         Session *s;
 706
 707         assert(u);
 708
 709         /* This elects a primary session for each user, which we call the "display". We try to keep the assignment
 710          * stable, but we "upgrade" to better choices. */
 711         log_debug("Electing new display for user %s", u->name);
 712
 713         LIST_FOREACH(sessions_by_user, s, u->sessions) {
 714                 if (!elect_display_filter(s)) {
 715                         log_debug("Ignoring session %s", s->id);
 716                         continue;
 717                 }
 718
 719                 if (elect_display_compare(s, u->display) < 0) {
 720                         log_debug("Choosing session %s in preference to %s", s->id, u->display ? u->display->id : "-");
 721                         u->display = s;
 722                 }
 723         }
 724 }
 725
 726 static int user_stop_timeout_callback(sd_event_source *es, uint64_t usec, void *userdata) {
 727         User *u = userdata;
 728
 729         assert(u);
 730         user_add_to_gc_queue(u);
 731
 732         return 0;
 733 }
 734
 735 void user_update_last_session_timer(User *u) {
 736         int r;
 737
 738         assert(u);
 739
 740         if (u->sessions) {
 741                 /* There are sessions, turn off the timer */
 742                 u->last_session_timestamp = USEC_INFINITY;
 743                 u->timer_event_source = sd_event_source_unref(u->timer_event_source);
 744                 return;
 745         }
 746
 747         if (u->last_session_timestamp != USEC_INFINITY)
 748                 return; /* Timer already started */
 749
 750         u->last_session_timestamp = now(CLOCK_MONOTONIC);
 751
 752         assert(!u->timer_event_source);
 753
 754         if (u->manager->user_stop_delay == 0 || u->manager->user_stop_delay == USEC_INFINITY)
 755                 return;
 756
 757         if (sd_event_get_state(u->manager->event) == SD_EVENT_FINISHED) {
 758                 log_debug("Not allocating user stop timeout, since we are already exiting.");
 759                 return;
 760         }
 761
 762         r = sd_event_add_time(u->manager->event,
 763                               &u->timer_event_source,
 764                               CLOCK_MONOTONIC,
 765                               usec_add(u->last_session_timestamp, u->manager->user_stop_delay), 0,
 766                               user_stop_timeout_callback, u);
 767         if (r < 0)
 768                 log_warning_errno(r, "Failed to enqueue user stop event source, ignoring: %m");
 769
 770         if (DEBUG_LOGGING) {
 771                 char s[FORMAT_TIMESPAN_MAX];
 772
 773                 log_debug("Last session of user '%s' logged out, terminating user context in %s.",
 774                           u->name,
 775                           format_timespan(s, sizeof(s), u->manager->user_stop_delay, USEC_PER_MSEC));
 776         }
 777 }
 778
 779 static const char* const user_state_table[_USER_STATE_MAX] = {
 780         [USER_OFFLINE] = "offline",
 781         [USER_OPENING] = "opening",
 782         [USER_LINGERING] = "lingering",
 783         [USER_ONLINE] = "online",
 784         [USER_ACTIVE] = "active",
 785         [USER_CLOSING] = "closing"
 786 };
 787
 788 DEFINE_STRING_TABLE_LOOKUP(user_state, UserState);
 789
 790 int config_parse_tmpfs_size(
 791                 const char* unit,
 792                 const char *filename,
 793                 unsigned line,
 794                 const char *section,
 795                 unsigned section_line,
 796                 const char *lvalue,
 797                 int ltype,
 798                 const char *rvalue,
 799                 void *data,
 800                 void *userdata) {
 801
 802         uint64_t *sz = data;
 803         int r;
 804
 805         assert(filename);
 806         assert(lvalue);
 807         assert(rvalue);
 808         assert(data);
 809
 810         /* First, try to parse as percentage */
 811         r = parse_permille(rvalue);
 812         if (r > 0 && r < 1000)
 813                 *sz = physical_memory_scale(r, 1000U);
 814         else {
 815                 uint64_t k;
 816
 817                 /* If the passed argument was not a percentage, or out of range, parse as byte size */
 818
 819                 r = parse_size(rvalue, 1024, &k);
 820                 if (r >= 0 && (k <= 0 || (uint64_t) (size_t) k != k))
 821                         r = -ERANGE;
 822                 if (r < 0) {
 823                         log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse size value '%s', ignoring: %m", rvalue);
 824                         return 0;
 825                 }
 826
 827                 *sz = PAGE_ALIGN((size_t) k);
 828         }
 829
 830         return 0;
 831 }
 832
 833 int config_parse_compat_user_tasks_max(
 834                 const char *unit,
 835                 const char *filename,
 836                 unsigned line,
 837                 const char *section,
 838                 unsigned section_line,
 839                 const char *lvalue,
 840                 int ltype,
 841                 const char *rvalue,
 842                 void *data,
 843                 void *userdata) {
 844
 845         assert(filename);
 846         assert(lvalue);
 847         assert(rvalue);
 848         assert(data);
 849
 850         log_syntax(unit, LOG_NOTICE, filename, line, 0,
 851                    "Support for option %s= has been removed.",
 852                    lvalue);
 853         log_info("Hint: try creating /etc/systemd/system/user-.slice.d/50-limits.conf with:\n"
 854                  "        [Slice]\n"
 855                  "        TasksMax=%s",
 856                  rvalue);
 857         return 0;
 858 }