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