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 "env-file.h"
  15 #include "escape.h"
  16 #include "fd-util.h"
  17 #include "fileio.h"
  18 #include "format-util.h"
  19 #include "fs-util.h"
  20 #include "hashmap.h"
  21 #include "label.h"
  22 #include "logind-user.h"
  23 #include "mkdir.h"
  24 #include "parse-util.h"
  25 #include "path-util.h"
  26 #include "rm-rf.h"
  27 #include "serialize.h"
  28 #include "special.h"
  29 #include "stdio-util.h"
  30 #include "string-table.h"
  31 #include "strv.h"
  32 #include "tmpfile-util.h"
  33 #include "unit-name.h"
  34 #include "user-util.h"
  35 #include "util.h"
  36
  37 int user_new(User **ret,
  38              Manager *m,
  39              uid_t uid,
  40              gid_t gid,
  41              const char *name,
  42              const char *home) {
  43
  44         _cleanup_(user_freep) User *u = NULL;
  45         char lu[DECIMAL_STR_MAX(uid_t) + 1];
  46         int r;
  47
  48         assert(ret);
  49         assert(m);
  50         assert(name);
  51
  52         u = new(User, 1);
  53         if (!u)
  54                 return -ENOMEM;
  55
  56         *u = (User) {
  57                 .manager = m,
  58                 .uid = uid,
  59                 .gid = gid,
  60                 .last_session_timestamp = USEC_INFINITY,
  61         };
  62
  63         u->name = strdup(name);
  64         if (!u->name)
  65                 return -ENOMEM;
  66
  67         u->home = strdup(home);
  68         if (!u->home)
  69                 return -ENOMEM;
  70
  71         path_simplify(u->home, true);
  72
  73         if (asprintf(&u->state_file, "/run/systemd/users/"UID_FMT, uid) < 0)
  74                 return -ENOMEM;
  75
  76         if (asprintf(&u->runtime_path, "/run/user/"UID_FMT, uid) < 0)
  77                 return -ENOMEM;
  78
  79         xsprintf(lu, UID_FMT, uid);
  80         r = slice_build_subslice(SPECIAL_USER_SLICE, lu, &u->slice);
  81         if (r < 0)
  82                 return r;
  83
  84         r = unit_name_build("user", lu, ".service", &u->service);
  85         if (r < 0)
  86                 return r;
  87
  88         r = unit_name_build("user-runtime-dir", lu, ".service", &u->runtime_dir_service);
  89         if (r < 0)
  90                 return r;
  91
  92         r = hashmap_put(m->users, UID_TO_PTR(uid), u);
  93         if (r < 0)
  94                 return r;
  95
  96         r = hashmap_put(m->user_units, u->slice, u);
  97         if (r < 0)
  98                 return r;
  99
 100         r = hashmap_put(m->user_units, u->service, u);
 101         if (r < 0)
 102                 return r;
 103
 104         r = hashmap_put(m->user_units, u->runtime_dir_service, u);
 105         if (r < 0)
 106                 return r;
 107
 108         *ret = TAKE_PTR(u);
 109         return 0;
 110 }
 111
 112 User *user_free(User *u) {
 113         if (!u)
 114                 return NULL;
 115
 116         if (u->in_gc_queue)
 117                 LIST_REMOVE(gc_queue, u->manager->user_gc_queue, u);
 118
 119         while (u->sessions)
 120                 session_free(u->sessions);
 121
 122         if (u->service)
 123                 hashmap_remove_value(u->manager->user_units, u->service, u);
 124
 125         if (u->runtime_dir_service)
 126                 hashmap_remove_value(u->manager->user_units, u->runtime_dir_service, u);
 127
 128         if (u->slice)
 129                 hashmap_remove_value(u->manager->user_units, u->slice, u);
 130
 131         hashmap_remove_value(u->manager->users, UID_TO_PTR(u->uid), u);
 132
 133         (void) sd_event_source_unref(u->timer_event_source);
 134
 135         u->service_job = mfree(u->service_job);
 136
 137         u->service = mfree(u->service);
 138         u->runtime_dir_service = mfree(u->runtime_dir_service);
 139         u->slice = mfree(u->slice);
 140         u->runtime_path = mfree(u->runtime_path);
 141         u->state_file = mfree(u->state_file);
 142         u->name = mfree(u->name);
 143         u->home = mfree(u->home);
 144
 145         return mfree(u);
 146 }
 147
 148 static int user_save_internal(User *u) {
 149         _cleanup_free_ char *temp_path = NULL;
 150         _cleanup_fclose_ FILE *f = NULL;
 151         int r;
 152
 153         assert(u);
 154         assert(u->state_file);
 155
 156         r = mkdir_safe_label("/run/systemd/users", 0755, 0, 0, MKDIR_WARN_MODE);
 157         if (r < 0)
 158                 goto fail;
 159
 160         r = fopen_temporary(u->state_file, &f, &temp_path);
 161         if (r < 0)
 162                 goto fail;
 163
 164         (void) __fsetlocking(f, FSETLOCKING_BYCALLER);
 165         (void) fchmod(fileno(f), 0644);
 166
 167         fprintf(f,
 168                 "# This is private data. Do not parse.\n"
 169                 "NAME=%s\n"
 170                 "STATE=%s\n"         /* friendly user-facing state */
 171                 "STOPPING=%s\n",     /* low-level state */
 172                 u->name,
 173                 user_state_to_string(user_get_state(u)),
 174                 yes_no(u->stopping));
 175
 176         /* LEGACY: no-one reads RUNTIME= anymore, drop it at some point */
 177         if (u->runtime_path)
 178                 fprintf(f, "RUNTIME=%s\n", u->runtime_path);
 179
 180         if (u->service_job)
 181                 fprintf(f, "SERVICE_JOB=%s\n", u->service_job);
 182
 183         if (u->display)
 184                 fprintf(f, "DISPLAY=%s\n", u->display->id);
 185
 186         if (dual_timestamp_is_set(&u->timestamp))
 187                 fprintf(f,
 188                         "REALTIME="USEC_FMT"\n"
 189                         "MONOTONIC="USEC_FMT"\n",
 190                         u->timestamp.realtime,
 191                         u->timestamp.monotonic);
 192
 193         if (u->last_session_timestamp != USEC_INFINITY)
 194                 fprintf(f, "LAST_SESSION_TIMESTAMP=" USEC_FMT "\n",
 195                         u->last_session_timestamp);
 196
 197         if (u->sessions) {
 198                 Session *i;
 199                 bool first;
 200
 201                 fputs("SESSIONS=", f);
 202                 first = true;
 203                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 204                         if (first)
 205                                 first = false;
 206                         else
 207                                 fputc(' ', f);
 208
 209                         fputs(i->id, f);
 210                 }
 211
 212                 fputs("\nSEATS=", f);
 213                 first = true;
 214                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 215                         if (!i->seat)
 216                                 continue;
 217
 218                         if (first)
 219                                 first = false;
 220                         else
 221                                 fputc(' ', f);
 222
 223                         fputs(i->seat->id, f);
 224                 }
 225
 226                 fputs("\nACTIVE_SESSIONS=", f);
 227                 first = true;
 228                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 229                         if (!session_is_active(i))
 230                                 continue;
 231
 232                         if (first)
 233                                 first = false;
 234                         else
 235                                 fputc(' ', f);
 236
 237                         fputs(i->id, f);
 238                 }
 239
 240                 fputs("\nONLINE_SESSIONS=", f);
 241                 first = true;
 242                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 243                         if (session_get_state(i) == SESSION_CLOSING)
 244                                 continue;
 245
 246                         if (first)
 247                                 first = false;
 248                         else
 249                                 fputc(' ', f);
 250
 251                         fputs(i->id, f);
 252                 }
 253
 254                 fputs("\nACTIVE_SEATS=", f);
 255                 first = true;
 256                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 257                         if (!session_is_active(i) || !i->seat)
 258                                 continue;
 259
 260                         if (first)
 261                                 first = false;
 262                         else
 263                                 fputc(' ', f);
 264
 265                         fputs(i->seat->id, f);
 266                 }
 267
 268                 fputs("\nONLINE_SEATS=", f);
 269                 first = true;
 270                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 271                         if (session_get_state(i) == SESSION_CLOSING || !i->seat)
 272                                 continue;
 273
 274                         if (first)
 275                                 first = false;
 276                         else
 277                                 fputc(' ', f);
 278
 279                         fputs(i->seat->id, f);
 280                 }
 281                 fputc('\n', f);
 282         }
 283
 284         r = fflush_and_check(f);
 285         if (r < 0)
 286                 goto fail;
 287
 288         if (rename(temp_path, u->state_file) < 0) {
 289                 r = -errno;
 290                 goto fail;
 291         }
 292
 293         return 0;
 294
 295 fail:
 296         (void) unlink(u->state_file);
 297
 298         if (temp_path)
 299                 (void) unlink(temp_path);
 300
 301         return log_error_errno(r, "Failed to save user data %s: %m", u->state_file);
 302 }
 303
 304 int user_save(User *u) {
 305         assert(u);
 306
 307         if (!u->started)
 308                 return 0;
 309
 310         return user_save_internal(u);
 311 }
 312
 313 int user_load(User *u) {
 314         _cleanup_free_ char *realtime = NULL, *monotonic = NULL, *stopping = NULL, *last_session_timestamp = NULL;
 315         int r;
 316
 317         assert(u);
 318
 319         r = parse_env_file(NULL, u->state_file,
 320                            "SERVICE_JOB",            &u->service_job,
 321                            "STOPPING",               &stopping,
 322                            "REALTIME",               &realtime,
 323                            "MONOTONIC",              &monotonic,
 324                            "LAST_SESSION_TIMESTAMP", &last_session_timestamp);
 325         if (r == -ENOENT)
 326                 return 0;
 327         if (r < 0)
 328                 return log_error_errno(r, "Failed to read %s: %m", u->state_file);
 329
 330         if (stopping) {
 331                 r = parse_boolean(stopping);
 332                 if (r < 0)
 333                         log_debug_errno(r, "Failed to parse 'STOPPING' boolean: %s", stopping);
 334                 else
 335                         u->stopping = r;
 336         }
 337
 338         if (realtime)
 339                 (void) deserialize_usec(realtime, &u->timestamp.realtime);
 340         if (monotonic)
 341                 (void) deserialize_usec(monotonic, &u->timestamp.monotonic);
 342         if (last_session_timestamp)
 343                 (void) deserialize_usec(last_session_timestamp, &u->last_session_timestamp);
 344
 345         return 0;
 346 }
 347
 348 static void user_start_service(User *u) {
 349         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 350         int r;
 351
 352         assert(u);
 353
 354         /* Start the service containing the "systemd --user" instance (user@.service). Note that we don't explicitly
 355          * start the per-user slice or the systemd-runtime-dir@.service instance, as those are pulled in both by
 356          * user@.service and the session scopes as dependencies. */
 357
 358         u->service_job = mfree(u->service_job);
 359
 360         r = manager_start_unit(u->manager, u->service, &error, &u->service_job);
 361         if (r < 0)
 362                 log_full_errno(sd_bus_error_has_name(&error, BUS_ERROR_UNIT_MASKED) ? LOG_DEBUG : LOG_WARNING, r,
 363                                "Failed to start user service '%s', ignoring: %s", u->service, bus_error_message(&error, r));
 364 }
 365
 366 int user_start(User *u) {
 367         assert(u);
 368
 369         if (u->started && !u->stopping)
 370                 return 0;
 371
 372         /* If u->stopping is set, the user is marked for removal and service stop-jobs are queued. We have to clear
 373          * that flag before queing the start-jobs again. If they succeed, the user object can be re-used just fine
 374          * (pid1 takes care of job-ordering and proper restart), but if they fail, we want to force another user_stop()
 375          * so possibly pending units are stopped. */
 376         u->stopping = false;
 377
 378         if (!u->started)
 379                 log_debug("Starting services for new user %s.", u->name);
 380
 381         /* Save the user data so far, because pam_systemd will read the XDG_RUNTIME_DIR out of it while starting up
 382          * systemd --user.  We need to do user_save_internal() because we have not "officially" started yet. */
 383         user_save_internal(u);
 384
 385         /* Start user@UID.service */
 386         user_start_service(u);
 387
 388         if (!u->started) {
 389                 if (!dual_timestamp_is_set(&u->timestamp))
 390                         dual_timestamp_get(&u->timestamp);
 391                 user_send_signal(u, true);
 392                 u->started = true;
 393         }
 394
 395         /* Save new user data */
 396         user_save(u);
 397
 398         return 0;
 399 }
 400
 401 static void user_stop_service(User *u) {
 402         _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 403         int r;
 404
 405         assert(u);
 406         assert(u->service);
 407
 408         /* The reverse of user_start_service(). Note that we only stop user@UID.service here, and let StopWhenUnneeded=
 409          * deal with the slice and the user-runtime-dir@.service instance. */
 410
 411         u->service_job = mfree(u->service_job);
 412
 413         r = manager_stop_unit(u->manager, u->service, &error, &u->service_job);
 414         if (r < 0)
 415                 log_warning_errno(r, "Failed to stop user service '%s', ignoring: %s", u->service, bus_error_message(&error, r));
 416 }
 417
 418 int user_stop(User *u, bool force) {
 419         Session *s;
 420         int r = 0;
 421         assert(u);
 422
 423         /* This is called whenever we begin with tearing down a user record. It's called in two cases: explicit API
 424          * request to do so via the bus (in which case 'force' is true) and automatically due to GC, if there's no
 425          * session left pinning it (in which case 'force' is false). Note that this just initiates tearing down of the
 426          * user, the User object will remain in memory until user_finalize() is called, see below. */
 427
 428         if (!u->started)
 429                 return 0;
 430
 431         if (u->stopping) { /* Stop jobs have already been queued */
 432                 user_save(u);
 433                 return 0;
 434         }
 435
 436         LIST_FOREACH(sessions_by_user, s, u->sessions) {
 437                 int k;
 438
 439                 k = session_stop(s, force);
 440                 if (k < 0)
 441                         r = k;
 442         }
 443
 444         user_stop_service(u);
 445
 446         u->stopping = true;
 447
 448         user_save(u);
 449
 450         return r;
 451 }
 452
 453 int user_finalize(User *u) {
 454         Session *s;
 455         int r = 0, k;
 456
 457         assert(u);
 458
 459         /* Called when the user is really ready to be freed, i.e. when all unit stop jobs and suchlike for it are
 460          * done. This is called as a result of an earlier user_done() when all jobs are completed. */
 461
 462         if (u->started)
 463                 log_debug("User %s logged out.", u->name);
 464
 465         LIST_FOREACH(sessions_by_user, s, u->sessions) {
 466                 k = session_finalize(s);
 467                 if (k < 0)
 468                         r = k;
 469         }
 470
 471         /* Clean SysV + POSIX IPC objects, but only if this is not a system user. Background: in many setups cronjobs
 472          * are run in full PAM and thus logind sessions, even if the code run doesn't belong to actual users but to
 473          * system components. Since enable RemoveIPC= globally for all users, we need to be a bit careful with such
 474          * cases, as we shouldn't accidentally remove a system service's IPC objects while it is running, just because
 475          * a cronjob running as the same user just finished. Hence: exclude system users generally from IPC clean-up,
 476          * and do it only for normal users. */
 477         if (u->manager->remove_ipc && !uid_is_system(u->uid)) {
 478                 k = clean_ipc_by_uid(u->uid);
 479                 if (k < 0)
 480                         r = k;
 481         }
 482
 483         (void) unlink(u->state_file);
 484         user_add_to_gc_queue(u);
 485
 486         if (u->started) {
 487                 user_send_signal(u, false);
 488                 u->started = false;
 489         }
 490
 491         return r;
 492 }
 493
 494 int user_get_idle_hint(User *u, dual_timestamp *t) {
 495         Session *s;
 496         bool idle_hint = true;
 497         dual_timestamp ts = DUAL_TIMESTAMP_NULL;
 498
 499         assert(u);
 500
 501         LIST_FOREACH(sessions_by_user, s, u->sessions) {
 502                 dual_timestamp k;
 503                 int ih;
 504
 505                 ih = session_get_idle_hint(s, &k);
 506                 if (ih < 0)
 507                         return ih;
 508
 509                 if (!ih) {
 510                         if (!idle_hint) {
 511                                 if (k.monotonic < ts.monotonic)
 512                                         ts = k;
 513                         } else {
 514                                 idle_hint = false;
 515                                 ts = k;
 516                         }
 517                 } else if (idle_hint) {
 518
 519                         if (k.monotonic > ts.monotonic)
 520                                 ts = k;
 521                 }
 522         }
 523
 524         if (t)
 525                 *t = ts;
 526
 527         return idle_hint;
 528 }
 529
 530 int user_check_linger_file(User *u) {
 531         _cleanup_free_ char *cc = NULL;
 532         char *p = NULL;
 533
 534         cc = cescape(u->name);
 535         if (!cc)
 536                 return -ENOMEM;
 537
 538         p = strjoina("/var/lib/systemd/linger/", cc);
 539         if (access(p, F_OK) < 0) {
 540                 if (errno != ENOENT)
 541                         return -errno;
 542
 543                 return false;
 544         }
 545
 546         return true;
 547 }
 548
 549 static bool user_unit_active(User *u) {
 550         const char *i;
 551         int r;
 552
 553         assert(u->service);
 554         assert(u->runtime_dir_service);
 555         assert(u->slice);
 556
 557         FOREACH_STRING(i, u->service, u->runtime_dir_service, u->slice) {
 558                 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 559
 560                 r = manager_unit_is_active(u->manager, i, &error);
 561                 if (r < 0)
 562                         log_debug_errno(r, "Failed to determine whether unit '%s' is active, ignoring: %s", u->service, bus_error_message(&error, r));
 563                 if (r != 0)
 564                         return true;
 565         }
 566
 567         return false;
 568 }
 569
 570 bool user_may_gc(User *u, bool drop_not_started) {
 571         int r;
 572
 573         assert(u);
 574
 575         if (drop_not_started && !u->started)
 576                 return true;
 577
 578         if (u->sessions)
 579                 return false;
 580
 581         if (u->last_session_timestamp != USEC_INFINITY) {
 582                 /* All sessions have been closed. Let's see if we shall leave the user record around for a bit */
 583
 584                 if (u->manager->user_stop_delay == USEC_INFINITY)
 585                         return false; /* Leave it around forever! */
 586                 if (u->manager->user_stop_delay > 0 &&
 587                     now(CLOCK_MONOTONIC) < usec_add(u->last_session_timestamp, u->manager->user_stop_delay))
 588                         return false; /* Leave it around for a bit longer. */
 589         }
 590
 591         /* Is this a user that shall stay around forever ("linger")? Before we say "no" to GC'ing for lingering users, let's check
 592          * if any of the three units that we maintain for this user is still around. If none of them is,
 593          * there's no need to keep this user around even if lingering is enabled. */
 594         if (user_check_linger_file(u) > 0 && user_unit_active(u))
 595                 return false;
 596
 597         /* Check if our job is still pending */
 598         if (u->service_job) {
 599                 _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
 600
 601                 r = manager_job_is_active(u->manager, u->service_job, &error);
 602                 if (r < 0)
 603                         log_debug_errno(r, "Failed to determine whether job '%s' is pending, ignoring: %s", u->service_job, bus_error_message(&error, r));
 604                 if (r != 0)
 605                         return false;
 606         }
 607
 608         /* Note that we don't care if the three units we manage for each user object are up or not, as we are managing
 609          * their state rather than tracking it. */
 610
 611         return true;
 612 }
 613
 614 void user_add_to_gc_queue(User *u) {
 615         assert(u);
 616
 617         if (u->in_gc_queue)
 618                 return;
 619
 620         LIST_PREPEND(gc_queue, u->manager->user_gc_queue, u);
 621         u->in_gc_queue = true;
 622 }
 623
 624 UserState user_get_state(User *u) {
 625         Session *i;
 626
 627         assert(u);
 628
 629         if (u->stopping)
 630                 return USER_CLOSING;
 631
 632         if (!u->started || u->service_job)
 633                 return USER_OPENING;
 634
 635         if (u->sessions) {
 636                 bool all_closing = true;
 637
 638                 LIST_FOREACH(sessions_by_user, i, u->sessions) {
 639                         SessionState state;
 640
 641                         state = session_get_state(i);
 642                         if (state == SESSION_ACTIVE)
 643                                 return USER_ACTIVE;
 644                         if (state != SESSION_CLOSING)
 645                                 all_closing = false;
 646                 }
 647
 648                 return all_closing ? USER_CLOSING : USER_ONLINE;
 649         }
 650
 651         if (user_check_linger_file(u) > 0 && user_unit_active(u))
 652                 return USER_LINGERING;
 653
 654         return USER_CLOSING;
 655 }
 656
 657 int user_kill(User *u, int signo) {
 658         assert(u);
 659
 660         return manager_kill_unit(u->manager, u->slice, KILL_ALL, signo, NULL);
 661 }
 662
 663 static bool elect_display_filter(Session *s) {
 664         /* Return true if the session is a candidate for the user’s ‘primary session’ or ‘display’. */
 665         assert(s);
 666
 667         return s->class == SESSION_USER && s->started && !s->stopping;
 668 }
 669
 670 static int elect_display_compare(Session *s1, Session *s2) {
 671         /* Indexed by SessionType. Lower numbers mean more preferred. */
 672         const int type_ranks[_SESSION_TYPE_MAX] = {
 673                 [SESSION_UNSPECIFIED] = 0,
 674                 [SESSION_TTY] = -2,
 675                 [SESSION_X11] = -3,
 676                 [SESSION_WAYLAND] = -3,
 677                 [SESSION_MIR] = -3,
 678                 [SESSION_WEB] = -1,
 679         };
 680
 681         /* Calculate the partial order relationship between s1 and s2,
 682          * returning < 0 if s1 is preferred as the user’s ‘primary session’,
 683          * 0 if s1 and s2 are equally preferred or incomparable, or > 0 if s2
 684          * is preferred.
 685          *
 686          * s1 or s2 may be NULL. */
 687         if (!s1 && !s2)
 688                 return 0;
 689
 690         if ((s1 == NULL) != (s2 == NULL))
 691                 return (s1 == NULL) - (s2 == NULL);
 692
 693         if (s1->stopping != s2->stopping)
 694                 return s1->stopping - s2->stopping;
 695
 696         if ((s1->class != SESSION_USER) != (s2->class != SESSION_USER))
 697                 return (s1->class != SESSION_USER) - (s2->class != SESSION_USER);
 698
 699         if ((s1->type == _SESSION_TYPE_INVALID) != (s2->type == _SESSION_TYPE_INVALID))
 700                 return (s1->type == _SESSION_TYPE_INVALID) - (s2->type == _SESSION_TYPE_INVALID);
 701
 702         if (s1->type != s2->type)
 703                 return type_ranks[s1->type] - type_ranks[s2->type];
 704
 705         return 0;
 706 }
 707
 708 void user_elect_display(User *u) {
 709         Session *s;
 710
 711         assert(u);
 712
 713         /* This elects a primary session for each user, which we call the "display". We try to keep the assignment
 714          * stable, but we "upgrade" to better choices. */
 715         log_debug("Electing new display for user %s", u->name);
 716
 717         LIST_FOREACH(sessions_by_user, s, u->sessions) {
 718                 if (!elect_display_filter(s)) {
 719                         log_debug("Ignoring session %s", s->id);
 720                         continue;
 721                 }
 722
 723                 if (elect_display_compare(s, u->display) < 0) {
 724                         log_debug("Choosing session %s in preference to %s", s->id, u->display ? u->display->id : "-");
 725                         u->display = s;
 726                 }
 727         }
 728 }
 729
 730 static int user_stop_timeout_callback(sd_event_source *es, uint64_t usec, void *userdata) {
 731         User *u = userdata;
 732
 733         assert(u);
 734         user_add_to_gc_queue(u);
 735
 736         return 0;
 737 }
 738
 739 void user_update_last_session_timer(User *u) {
 740         int r;
 741
 742         assert(u);
 743
 744         if (u->sessions) {
 745                 /* There are sessions, turn off the timer */
 746                 u->last_session_timestamp = USEC_INFINITY;
 747                 u->timer_event_source = sd_event_source_unref(u->timer_event_source);
 748                 return;
 749         }
 750
 751         if (u->last_session_timestamp != USEC_INFINITY)
 752                 return; /* Timer already started */
 753
 754         u->last_session_timestamp = now(CLOCK_MONOTONIC);
 755
 756         assert(!u->timer_event_source);
 757
 758         if (u->manager->user_stop_delay == 0 || u->manager->user_stop_delay == USEC_INFINITY)
 759                 return;
 760
 761         if (sd_event_get_state(u->manager->event) == SD_EVENT_FINISHED) {
 762                 log_debug("Not allocating user stop timeout, since we are already exiting.");
 763                 return;
 764         }
 765
 766         r = sd_event_add_time(u->manager->event,
 767                               &u->timer_event_source,
 768                               CLOCK_MONOTONIC,
 769                               usec_add(u->last_session_timestamp, u->manager->user_stop_delay), 0,
 770                               user_stop_timeout_callback, u);
 771         if (r < 0)
 772                 log_warning_errno(r, "Failed to enqueue user stop event source, ignoring: %m");
 773
 774         if (DEBUG_LOGGING) {
 775                 char s[FORMAT_TIMESPAN_MAX];
 776
 777                 log_debug("Last session of user '%s' logged out, terminating user context in %s.",
 778                           u->name,
 779                           format_timespan(s, sizeof(s), u->manager->user_stop_delay, USEC_PER_MSEC));
 780         }
 781 }
 782
 783 static const char* const user_state_table[_USER_STATE_MAX] = {
 784         [USER_OFFLINE] = "offline",
 785         [USER_OPENING] = "opening",
 786         [USER_LINGERING] = "lingering",
 787         [USER_ONLINE] = "online",
 788         [USER_ACTIVE] = "active",
 789         [USER_CLOSING] = "closing"
 790 };
 791
 792 DEFINE_STRING_TABLE_LOOKUP(user_state, UserState);
 793
 794 int config_parse_tmpfs_size(
 795                 const char* unit,
 796                 const char *filename,
 797                 unsigned line,
 798                 const char *section,
 799                 unsigned section_line,
 800                 const char *lvalue,
 801                 int ltype,
 802                 const char *rvalue,
 803                 void *data,
 804                 void *userdata) {
 805
 806         uint64_t *sz = data;
 807         int r;
 808
 809         assert(filename);
 810         assert(lvalue);
 811         assert(rvalue);
 812         assert(data);
 813
 814         /* First, try to parse as percentage */
 815         r = parse_permille(rvalue);
 816         if (r > 0 && r < 1000)
 817                 *sz = physical_memory_scale(r, 1000U);
 818         else {
 819                 uint64_t k;
 820
 821                 /* If the passed argument was not a percentage, or out of range, parse as byte size */
 822
 823                 r = parse_size(rvalue, 1024, &k);
 824                 if (r >= 0 && (k <= 0 || (uint64_t) (size_t) k != k))
 825                         r = -ERANGE;
 826                 if (r < 0) {
 827                         log_syntax(unit, LOG_ERR, filename, line, r, "Failed to parse size value '%s', ignoring: %m", rvalue);
 828                         return 0;
 829                 }
 830
 831                 *sz = PAGE_ALIGN((size_t) k);
 832         }
 833
 834         return 0;
 835 }
 836
 837 int config_parse_compat_user_tasks_max(
 838                 const char *unit,
 839                 const char *filename,
 840                 unsigned line,
 841                 const char *section,
 842                 unsigned section_line,
 843                 const char *lvalue,
 844                 int ltype,
 845                 const char *rvalue,
 846                 void *data,
 847                 void *userdata) {
 848
 849         assert(filename);
 850         assert(lvalue);
 851         assert(rvalue);
 852         assert(data);
 853
 854         log_syntax(unit, LOG_NOTICE, filename, line, 0,
 855                    "Support for option %s= has been removed.",
 856                    lvalue);
 857         log_info("Hint: try creating /etc/systemd/system/user-.slice.d/50-limits.conf with:\n"
 858                  "        [Slice]\n"
 859                  "        TasksMax=%s",
 860                  rvalue);
 861         return 0;
 862 }