src/login/logind-session-dbus.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2011 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <errno.h>
  21 #include <string.h>
  22
  23 #include "alloc-util.h"
  24 #include "bus-common-errors.h"
  25 #include "bus-label.h"
  26 #include "bus-util.h"
  27 #include "fd-util.h"
  28 #include "logind-session-device.h"
  29 #include "logind-session.h"
  30 #include "logind.h"
  31 #include "signal-util.h"
  32 #include "strv.h"
  33 #include "util.h"
  34
  35 static int property_get_user(
  36                 sd_bus *bus,
  37                 const char *path,
  38                 const char *interface,
  39                 const char *property,
  40                 sd_bus_message *reply,
  41                 void *userdata,
  42                 sd_bus_error *error) {
  43
  44         _cleanup_free_ char *p = NULL;
  45         Session *s = userdata;
  46
  47         assert(bus);
  48         assert(reply);
  49         assert(s);
  50
  51         p = user_bus_path(s->user);
  52         if (!p)
  53                 return -ENOMEM;
  54
  55         return sd_bus_message_append(reply, "(uo)", (uint32_t) s->user->uid, p);
  56 }
  57
  58 static int property_get_name(
  59                 sd_bus *bus,
  60                 const char *path,
  61                 const char *interface,
  62                 const char *property,
  63                 sd_bus_message *reply,
  64                 void *userdata,
  65                 sd_bus_error *error) {
  66
  67         Session *s = userdata;
  68
  69         assert(bus);
  70         assert(reply);
  71         assert(s);
  72
  73         return sd_bus_message_append(reply, "s", s->user->name);
  74 }
  75
  76 static int property_get_seat(
  77                 sd_bus *bus,
  78                 const char *path,
  79                 const char *interface,
  80                 const char *property,
  81                 sd_bus_message *reply,
  82                 void *userdata,
  83                 sd_bus_error *error) {
  84
  85         _cleanup_free_ char *p = NULL;
  86         Session *s = userdata;
  87
  88         assert(bus);
  89         assert(reply);
  90         assert(s);
  91
  92         p = s->seat ? seat_bus_path(s->seat) : strdup("/");
  93         if (!p)
  94                 return -ENOMEM;
  95
  96         return sd_bus_message_append(reply, "(so)", s->seat ? s->seat->id : "", p);
  97 }
  98
  99 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_type, session_type, SessionType);
 100 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_class, session_class, SessionClass);
 101
 102 static int property_get_active(
 103                 sd_bus *bus,
 104                 const char *path,
 105                 const char *interface,
 106                 const char *property,
 107                 sd_bus_message *reply,
 108                 void *userdata,
 109                 sd_bus_error *error) {
 110
 111         Session *s = userdata;
 112
 113         assert(bus);
 114         assert(reply);
 115         assert(s);
 116
 117         return sd_bus_message_append(reply, "b", session_is_active(s));
 118 }
 119
 120 static int property_get_state(
 121                 sd_bus *bus,
 122                 const char *path,
 123                 const char *interface,
 124                 const char *property,
 125                 sd_bus_message *reply,
 126                 void *userdata,
 127                 sd_bus_error *error) {
 128
 129         Session *s = userdata;
 130
 131         assert(bus);
 132         assert(reply);
 133         assert(s);
 134
 135         return sd_bus_message_append(reply, "s", session_state_to_string(session_get_state(s)));
 136 }
 137
 138 static int property_get_idle_hint(
 139                 sd_bus *bus,
 140                 const char *path,
 141                 const char *interface,
 142                 const char *property,
 143                 sd_bus_message *reply,
 144                 void *userdata,
 145                 sd_bus_error *error) {
 146
 147         Session *s = userdata;
 148
 149         assert(bus);
 150         assert(reply);
 151         assert(s);
 152
 153         return sd_bus_message_append(reply, "b", session_get_idle_hint(s, NULL) > 0);
 154 }
 155
 156 static int property_get_idle_since_hint(
 157                 sd_bus *bus,
 158                 const char *path,
 159                 const char *interface,
 160                 const char *property,
 161                 sd_bus_message *reply,
 162                 void *userdata,
 163                 sd_bus_error *error) {
 164
 165         Session *s = userdata;
 166         dual_timestamp t = DUAL_TIMESTAMP_NULL;
 167         uint64_t u;
 168         int r;
 169
 170         assert(bus);
 171         assert(reply);
 172         assert(s);
 173
 174         r = session_get_idle_hint(s, &t);
 175         if (r < 0)
 176                 return r;
 177
 178         u = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
 179
 180         return sd_bus_message_append(reply, "t", u);
 181 }
 182
 183 static int property_get_locked_hint(
 184                 sd_bus *bus,
 185                 const char *path,
 186                 const char *interface,
 187                 const char *property,
 188                 sd_bus_message *reply,
 189                 void *userdata,
 190                 sd_bus_error *error) {
 191
 192         Session *s = userdata;
 193
 194         assert(bus);
 195         assert(reply);
 196         assert(s);
 197
 198         return sd_bus_message_append(reply, "b", session_get_locked_hint(s) > 0);
 199 }
 200
 201 int bus_session_method_terminate(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 202         Session *s = userdata;
 203         int r;
 204
 205         assert(message);
 206         assert(s);
 207
 208         r = bus_verify_polkit_async(
 209                         message,
 210                         CAP_KILL,
 211                         "org.freedesktop.login1.manage",
 212                         NULL,
 213                         false,
 214                         s->user->uid,
 215                         &s->manager->polkit_registry,
 216                         error);
 217         if (r < 0)
 218                 return r;
 219         if (r == 0)
 220                 return 1; /* Will call us back */
 221
 222         r = session_stop(s, true);
 223         if (r < 0)
 224                 return r;
 225
 226         return sd_bus_reply_method_return(message, NULL);
 227 }
 228
 229 int bus_session_method_activate(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 230         Session *s = userdata;
 231         int r;
 232
 233         assert(message);
 234         assert(s);
 235
 236         r = session_activate(s);
 237         if (r < 0)
 238                 return r;
 239
 240         return sd_bus_reply_method_return(message, NULL);
 241 }
 242
 243 int bus_session_method_lock(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 244         Session *s = userdata;
 245         int r;
 246
 247         assert(message);
 248         assert(s);
 249
 250         r = bus_verify_polkit_async(
 251                         message,
 252                         CAP_SYS_ADMIN,
 253                         "org.freedesktop.login1.lock-sessions",
 254                         NULL,
 255                         false,
 256                         s->user->uid,
 257                         &s->manager->polkit_registry,
 258                         error);
 259         if (r < 0)
 260                 return r;
 261         if (r == 0)
 262                 return 1; /* Will call us back */
 263
 264         r = session_send_lock(s, strstr(sd_bus_message_get_member(message), "Lock"));
 265         if (r < 0)
 266                 return r;
 267
 268         return sd_bus_reply_method_return(message, NULL);
 269 }
 270
 271 static int method_set_idle_hint(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 272         _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
 273         Session *s = userdata;
 274         uid_t uid;
 275         int r, b;
 276
 277         assert(message);
 278         assert(s);
 279
 280         r = sd_bus_message_read(message, "b", &b);
 281         if (r < 0)
 282                 return r;
 283
 284         r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID, &creds);
 285         if (r < 0)
 286                 return r;
 287
 288         r = sd_bus_creds_get_euid(creds, &uid);
 289         if (r < 0)
 290                 return r;
 291
 292         if (uid != 0 && uid != s->user->uid)
 293                 return sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Only owner of session may set idle hint");
 294
 295         session_set_idle_hint(s, b);
 296
 297         return sd_bus_reply_method_return(message, NULL);
 298 }
 299
 300 static int method_set_locked_hint(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 301         _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
 302         Session *s = userdata;
 303         uid_t uid;
 304         int r, b;
 305
 306         assert(message);
 307         assert(s);
 308
 309         r = sd_bus_message_read(message, "b", &b);
 310         if (r < 0)
 311                 return r;
 312
 313         r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID, &creds);
 314         if (r < 0)
 315                 return r;
 316
 317         r = sd_bus_creds_get_euid(creds, &uid);
 318         if (r < 0)
 319                 return r;
 320
 321         if (uid != 0 && uid != s->user->uid)
 322                 return sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Only owner of session may set locked hint");
 323
 324         session_set_locked_hint(s, b);
 325
 326         return sd_bus_reply_method_return(message, NULL);
 327 }
 328
 329 int bus_session_method_kill(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 330         Session *s = userdata;
 331         const char *swho;
 332         int32_t signo;
 333         KillWho who;
 334         int r;
 335
 336         assert(message);
 337         assert(s);
 338
 339         r = sd_bus_message_read(message, "si", &swho, &signo);
 340         if (r < 0)
 341                 return r;
 342
 343         if (isempty(swho))
 344                 who = KILL_ALL;
 345         else {
 346                 who = kill_who_from_string(swho);
 347                 if (who < 0)
 348                         return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid kill parameter '%s'", swho);
 349         }
 350
 351         if (!SIGNAL_VALID(signo))
 352                 return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Invalid signal %i", signo);
 353
 354         r = bus_verify_polkit_async(
 355                         message,
 356                         CAP_KILL,
 357                         "org.freedesktop.login1.manage",
 358                         NULL,
 359                         false,
 360                         s->user->uid,
 361                         &s->manager->polkit_registry,
 362                         error);
 363         if (r < 0)
 364                 return r;
 365         if (r == 0)
 366                 return 1; /* Will call us back */
 367
 368         r = session_kill(s, who, signo);
 369         if (r < 0)
 370                 return r;
 371
 372         return sd_bus_reply_method_return(message, NULL);
 373 }
 374
 375 static int method_take_control(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 376         _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
 377         Session *s = userdata;
 378         int r, force;
 379         uid_t uid;
 380
 381         assert(message);
 382         assert(s);
 383
 384         r = sd_bus_message_read(message, "b", &force);
 385         if (r < 0)
 386                 return r;
 387
 388         r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_EUID, &creds);
 389         if (r < 0)
 390                 return r;
 391
 392         r = sd_bus_creds_get_euid(creds, &uid);
 393         if (r < 0)
 394                 return r;
 395
 396         if (uid != 0 && (force || uid != s->user->uid))
 397                 return sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Only owner of session may take control");
 398
 399         r = session_set_controller(s, sd_bus_message_get_sender(message), force, true);
 400         if (r < 0)
 401                 return r;
 402
 403         return sd_bus_reply_method_return(message, NULL);
 404 }
 405
 406 static int method_release_control(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 407         Session *s = userdata;
 408
 409         assert(message);
 410         assert(s);
 411
 412         if (!session_is_controller(s, sd_bus_message_get_sender(message)))
 413                 return sd_bus_error_setf(error, BUS_ERROR_NOT_IN_CONTROL, "You are not in control of this session");
 414
 415         session_drop_controller(s);
 416
 417         return sd_bus_reply_method_return(message, NULL);
 418 }
 419
 420 static int method_take_device(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 421         Session *s = userdata;
 422         uint32_t major, minor;
 423         SessionDevice *sd;
 424         dev_t dev;
 425         int r;
 426
 427         assert(message);
 428         assert(s);
 429
 430         r = sd_bus_message_read(message, "uu", &major, &minor);
 431         if (r < 0)
 432                 return r;
 433
 434         if (!session_is_controller(s, sd_bus_message_get_sender(message)))
 435                 return sd_bus_error_setf(error, BUS_ERROR_NOT_IN_CONTROL, "You are not in control of this session");
 436
 437         dev = makedev(major, minor);
 438         sd = hashmap_get(s->devices, &dev);
 439         if (sd)
 440                 /* We don't allow retrieving a device multiple times.
 441                  * The related ReleaseDevice call is not ref-counted.
 442                  * The caller should use dup() if it requires more
 443                  * than one fd (it would be functionally
 444                  * equivalent). */
 445                 return sd_bus_error_setf(error, BUS_ERROR_DEVICE_IS_TAKEN, "Device already taken");
 446
 447         r = session_device_new(s, dev, true, &sd);
 448         if (r < 0)
 449                 return r;
 450
 451         r = session_device_save(sd);
 452         if (r < 0)
 453                 goto error;
 454
 455         r = sd_bus_reply_method_return(message, "hb", sd->fd, !sd->active);
 456         if (r < 0)
 457                 goto error;
 458
 459         session_save(s);
 460         return 0;
 461
 462 error:
 463         session_device_free(sd);
 464         return r;
 465 }
 466
 467 static int method_release_device(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 468         Session *s = userdata;
 469         uint32_t major, minor;
 470         SessionDevice *sd;
 471         dev_t dev;
 472         int r;
 473
 474         assert(message);
 475         assert(s);
 476
 477         r = sd_bus_message_read(message, "uu", &major, &minor);
 478         if (r < 0)
 479                 return r;
 480
 481         if (!session_is_controller(s, sd_bus_message_get_sender(message)))
 482                 return sd_bus_error_setf(error, BUS_ERROR_NOT_IN_CONTROL, "You are not in control of this session");
 483
 484         dev = makedev(major, minor);
 485         sd = hashmap_get(s->devices, &dev);
 486         if (!sd)
 487                 return sd_bus_error_setf(error, BUS_ERROR_DEVICE_NOT_TAKEN, "Device not taken");
 488
 489         session_device_free(sd);
 490         session_save(s);
 491
 492         return sd_bus_reply_method_return(message, NULL);
 493 }
 494
 495 static int method_pause_device_complete(sd_bus_message *message, void *userdata, sd_bus_error *error) {
 496         Session *s = userdata;
 497         uint32_t major, minor;
 498         SessionDevice *sd;
 499         dev_t dev;
 500         int r;
 501
 502         assert(message);
 503         assert(s);
 504
 505         r = sd_bus_message_read(message, "uu", &major, &minor);
 506         if (r < 0)
 507                 return r;
 508
 509         if (!session_is_controller(s, sd_bus_message_get_sender(message)))
 510                 return sd_bus_error_setf(error, BUS_ERROR_NOT_IN_CONTROL, "You are not in control of this session");
 511
 512         dev = makedev(major, minor);
 513         sd = hashmap_get(s->devices, &dev);
 514         if (!sd)
 515                 return sd_bus_error_setf(error, BUS_ERROR_DEVICE_NOT_TAKEN, "Device not taken");
 516
 517         session_device_complete_pause(sd);
 518
 519         return sd_bus_reply_method_return(message, NULL);
 520 }
 521
 522 const sd_bus_vtable session_vtable[] = {
 523         SD_BUS_VTABLE_START(0),
 524
 525         SD_BUS_PROPERTY("Id", "s", NULL, offsetof(Session, id), SD_BUS_VTABLE_PROPERTY_CONST),
 526         SD_BUS_PROPERTY("User", "(uo)", property_get_user, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 527         SD_BUS_PROPERTY("Name", "s", property_get_name, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 528         BUS_PROPERTY_DUAL_TIMESTAMP("Timestamp", offsetof(Session, timestamp), SD_BUS_VTABLE_PROPERTY_CONST),
 529         SD_BUS_PROPERTY("VTNr", "u", NULL, offsetof(Session, vtnr), SD_BUS_VTABLE_PROPERTY_CONST),
 530         SD_BUS_PROPERTY("Seat", "(so)", property_get_seat, 0, SD_BUS_VTABLE_PROPERTY_CONST),
 531         SD_BUS_PROPERTY("TTY", "s", NULL, offsetof(Session, tty), SD_BUS_VTABLE_PROPERTY_CONST),
 532         SD_BUS_PROPERTY("Display", "s", NULL, offsetof(Session, display), SD_BUS_VTABLE_PROPERTY_CONST),
 533         SD_BUS_PROPERTY("Remote", "b", bus_property_get_bool, offsetof(Session, remote), SD_BUS_VTABLE_PROPERTY_CONST),
 534         SD_BUS_PROPERTY("RemoteHost", "s", NULL, offsetof(Session, remote_host), SD_BUS_VTABLE_PROPERTY_CONST),
 535         SD_BUS_PROPERTY("RemoteUser", "s", NULL, offsetof(Session, remote_user), SD_BUS_VTABLE_PROPERTY_CONST),
 536         SD_BUS_PROPERTY("Service", "s", NULL, offsetof(Session, service), SD_BUS_VTABLE_PROPERTY_CONST),
 537         SD_BUS_PROPERTY("Desktop", "s", NULL, offsetof(Session, desktop), SD_BUS_VTABLE_PROPERTY_CONST),
 538         SD_BUS_PROPERTY("Scope", "s", NULL, offsetof(Session, scope), SD_BUS_VTABLE_PROPERTY_CONST),
 539         SD_BUS_PROPERTY("Leader", "u", bus_property_get_pid, offsetof(Session, leader), SD_BUS_VTABLE_PROPERTY_CONST),
 540         SD_BUS_PROPERTY("Audit", "u", NULL, offsetof(Session, audit_id), SD_BUS_VTABLE_PROPERTY_CONST),
 541         SD_BUS_PROPERTY("Type", "s", property_get_type, offsetof(Session, type), SD_BUS_VTABLE_PROPERTY_CONST),
 542         SD_BUS_PROPERTY("Class", "s", property_get_class, offsetof(Session, class), SD_BUS_VTABLE_PROPERTY_CONST),
 543         SD_BUS_PROPERTY("Active", "b", property_get_active, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 544         SD_BUS_PROPERTY("State", "s", property_get_state, 0, 0),
 545         SD_BUS_PROPERTY("IdleHint", "b", property_get_idle_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 546         SD_BUS_PROPERTY("IdleSinceHint", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 547         SD_BUS_PROPERTY("IdleSinceHintMonotonic", "t", property_get_idle_since_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 548         SD_BUS_PROPERTY("LockedHint", "b", property_get_locked_hint, 0, SD_BUS_VTABLE_PROPERTY_EMITS_CHANGE),
 549
 550         SD_BUS_METHOD("Terminate", NULL, NULL, bus_session_method_terminate, SD_BUS_VTABLE_UNPRIVILEGED),
 551         SD_BUS_METHOD("Activate", NULL, NULL, bus_session_method_activate, SD_BUS_VTABLE_UNPRIVILEGED),
 552         SD_BUS_METHOD("Lock", NULL, NULL, bus_session_method_lock, SD_BUS_VTABLE_UNPRIVILEGED),
 553         SD_BUS_METHOD("Unlock", NULL, NULL, bus_session_method_lock, SD_BUS_VTABLE_UNPRIVILEGED),
 554         SD_BUS_METHOD("SetIdleHint", "b", NULL, method_set_idle_hint, SD_BUS_VTABLE_UNPRIVILEGED),
 555         SD_BUS_METHOD("SetLockedHint", "b", NULL, method_set_locked_hint, SD_BUS_VTABLE_UNPRIVILEGED),
 556         SD_BUS_METHOD("Kill", "si", NULL, bus_session_method_kill, SD_BUS_VTABLE_UNPRIVILEGED),
 557         SD_BUS_METHOD("TakeControl", "b", NULL, method_take_control, SD_BUS_VTABLE_UNPRIVILEGED),
 558         SD_BUS_METHOD("ReleaseControl", NULL, NULL, method_release_control, SD_BUS_VTABLE_UNPRIVILEGED),
 559         SD_BUS_METHOD("TakeDevice", "uu", "hb", method_take_device, SD_BUS_VTABLE_UNPRIVILEGED),
 560         SD_BUS_METHOD("ReleaseDevice", "uu", NULL, method_release_device, SD_BUS_VTABLE_UNPRIVILEGED),
 561         SD_BUS_METHOD("PauseDeviceComplete", "uu", NULL, method_pause_device_complete, SD_BUS_VTABLE_UNPRIVILEGED),
 562
 563         SD_BUS_SIGNAL("PauseDevice", "uus", 0),
 564         SD_BUS_SIGNAL("ResumeDevice", "uuh", 0),
 565         SD_BUS_SIGNAL("Lock", NULL, 0),
 566         SD_BUS_SIGNAL("Unlock", NULL, 0),
 567
 568         SD_BUS_VTABLE_END
 569 };
 570
 571 int session_object_find(sd_bus *bus, const char *path, const char *interface, void *userdata, void **found, sd_bus_error *error) {
 572         Manager *m = userdata;
 573         Session *session;
 574         int r;
 575
 576         assert(bus);
 577         assert(path);
 578         assert(interface);
 579         assert(found);
 580         assert(m);
 581
 582         if (streq(path, "/org/freedesktop/login1/session/self")) {
 583                 _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
 584                 sd_bus_message *message;
 585                 const char *name;
 586
 587                 message = sd_bus_get_current_message(bus);
 588                 if (!message)
 589                         return 0;
 590
 591                 r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_SESSION|SD_BUS_CREDS_AUGMENT, &creds);
 592                 if (r < 0)
 593                         return r;
 594
 595                 r = sd_bus_creds_get_session(creds, &name);
 596                 if (r < 0)
 597                         return r;
 598
 599                 session = hashmap_get(m->sessions, name);
 600         } else {
 601                 _cleanup_free_ char *e = NULL;
 602                 const char *p;
 603
 604                 p = startswith(path, "/org/freedesktop/login1/session/");
 605                 if (!p)
 606                         return 0;
 607
 608                 e = bus_label_unescape(p);
 609                 if (!e)
 610                         return -ENOMEM;
 611
 612                 session = hashmap_get(m->sessions, e);
 613         }
 614
 615         if (!session)
 616                 return 0;
 617
 618         *found = session;
 619         return 1;
 620 }
 621
 622 char *session_bus_path(Session *s) {
 623         _cleanup_free_ char *t = NULL;
 624
 625         assert(s);
 626
 627         t = bus_label_escape(s->id);
 628         if (!t)
 629                 return NULL;
 630
 631         return strappend("/org/freedesktop/login1/session/", t);
 632 }
 633
 634 int session_node_enumerator(sd_bus *bus, const char *path, void *userdata, char ***nodes, sd_bus_error *error) {
 635         _cleanup_strv_free_ char **l = NULL;
 636         sd_bus_message *message;
 637         Manager *m = userdata;
 638         Session *session;
 639         Iterator i;
 640         int r;
 641
 642         assert(bus);
 643         assert(path);
 644         assert(nodes);
 645
 646         HASHMAP_FOREACH(session, m->sessions, i) {
 647                 char *p;
 648
 649                 p = session_bus_path(session);
 650                 if (!p)
 651                         return -ENOMEM;
 652
 653                 r = strv_consume(&l, p);
 654                 if (r < 0)
 655                         return r;
 656         }
 657
 658         message = sd_bus_get_current_message(bus);
 659         if (message) {
 660                 _cleanup_(sd_bus_creds_unrefp) sd_bus_creds *creds = NULL;
 661                 const char *name;
 662
 663                 r = sd_bus_query_sender_creds(message, SD_BUS_CREDS_SESSION|SD_BUS_CREDS_AUGMENT, &creds);
 664                 if (r >= 0) {
 665                         r = sd_bus_creds_get_session(creds, &name);
 666                         if (r >= 0) {
 667                                 session = hashmap_get(m->sessions, name);
 668                                 if (session) {
 669                                         r = strv_extend(&l, "/org/freedesktop/login1/session/self");
 670                                         if (r < 0)
 671                                                 return r;
 672                                 }
 673                         }
 674                 }
 675         }
 676
 677         *nodes = l;
 678         l = NULL;
 679
 680         return 1;
 681 }
 682
 683 int session_send_signal(Session *s, bool new_session) {
 684         _cleanup_free_ char *p = NULL;
 685
 686         assert(s);
 687
 688         p = session_bus_path(s);
 689         if (!p)
 690                 return -ENOMEM;
 691
 692         return sd_bus_emit_signal(
 693                         s->manager->bus,
 694                         "/org/freedesktop/login1",
 695                         "org.freedesktop.login1.Manager",
 696                         new_session ? "SessionNew" : "SessionRemoved",
 697                         "so", s->id, p);
 698 }
 699
 700 int session_send_changed(Session *s, const char *properties, ...) {
 701         _cleanup_free_ char *p = NULL;
 702         char **l;
 703
 704         assert(s);
 705
 706         if (!s->started)
 707                 return 0;
 708
 709         p = session_bus_path(s);
 710         if (!p)
 711                 return -ENOMEM;
 712
 713         l = strv_from_stdarg_alloca(properties);
 714
 715         return sd_bus_emit_properties_changed_strv(s->manager->bus, p, "org.freedesktop.login1.Session", l);
 716 }
 717
 718 int session_send_lock(Session *s, bool lock) {
 719         _cleanup_free_ char *p = NULL;
 720
 721         assert(s);
 722
 723         p = session_bus_path(s);
 724         if (!p)
 725                 return -ENOMEM;
 726
 727         return sd_bus_emit_signal(
 728                         s->manager->bus,
 729                         p,
 730                         "org.freedesktop.login1.Session",
 731                         lock ? "Lock" : "Unlock",
 732                         NULL);
 733 }
 734
 735 int session_send_lock_all(Manager *m, bool lock) {
 736         Session *session;
 737         Iterator i;
 738         int r = 0;
 739
 740         assert(m);
 741
 742         HASHMAP_FOREACH(session, m->sessions, i) {
 743                 int k;
 744
 745                 k = session_send_lock(session, lock);
 746                 if (k < 0)
 747                         r = k;
 748         }
 749
 750         return r;
 751 }
 752
 753 int session_send_create_reply(Session *s, sd_bus_error *error) {
 754         _cleanup_(sd_bus_message_unrefp) sd_bus_message *c = NULL;
 755         _cleanup_close_ int fifo_fd = -1;
 756         _cleanup_free_ char *p = NULL;
 757
 758         assert(s);
 759
 760         /* This is called after the session scope and the user service
 761          * were successfully created, and finishes where
 762          * bus_manager_create_session() left off. */
 763
 764         if (!s->create_message)
 765                 return 0;
 766
 767 #if 0 /// elogind does not support scope and service jobs
 768         if (!sd_bus_error_is_set(error) && (s->scope_job || s->user->service_job))
 769                 return 0;
 770 #endif // 0
 771
 772         c = s->create_message;
 773         s->create_message = NULL;
 774
 775         if (error)
 776                 return sd_bus_reply_method_error(c, error);
 777
 778         fifo_fd = session_create_fifo(s);
 779         if (fifo_fd < 0)
 780                 return fifo_fd;
 781
 782         /* Update the session state file before we notify the client
 783          * about the result. */
 784         session_save(s);
 785
 786 #if 1 /// Additionally elogind saves the user state file
 787         user_save(s->user);
 788 #endif // 1
 789         p = session_bus_path(s);
 790         if (!p)
 791                 return -ENOMEM;
 792
 793         log_debug("Sending reply about created session: "
 794                   "id=%s object_path=%s uid=%u runtime_path=%s "
 795                   "session_fd=%d seat=%s vtnr=%u",
 796                   s->id,
 797                   p,
 798                   (uint32_t) s->user->uid,
 799                   s->user->runtime_path,
 800                   fifo_fd,
 801                   s->seat ? s->seat->id : "",
 802                   (uint32_t) s->vtnr);
 803
 804         return sd_bus_reply_method_return(
 805                         c, "soshusub",
 806                         s->id,
 807                         p,
 808                         s->user->runtime_path,
 809                         fifo_fd,
 810                         (uint32_t) s->user->uid,
 811                         s->seat ? s->seat->id : "",
 812                         (uint32_t) s->vtnr,
 813                         false);
 814 }