src/logind-dbus.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2011 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <errno.h>
  23 #include <string.h>
  24 #include <unistd.h>
  25 #include <pwd.h>
  26
  27 #include "logind.h"
  28 #include "dbus-common.h"
  29 #include "strv.h"
  30 #include "polkit.h"
  31
  32 #define BUS_MANAGER_INTERFACE                                           \
  33         " <interface name=\"org.freedesktop.login1.Manager\">\n"        \
  34         "  <method name=\"GetSession\">\n"                              \
  35         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  36         "   <arg name=\"session\" type=\"o\" direction=\"out\"/>\n"     \
  37         "  </method>\n"                                                 \
  38         "  <method name=\"GetUser\">\n"                                 \
  39         "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
  40         "   <arg name=\"user\" type=\"o\" direction=\"out\"/>\n"        \
  41         "  </method>\n"                                                 \
  42         "  <method name=\"GetSeat\">\n"                                 \
  43         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  44         "   <arg name=\"seat\" type=\"o\" direction=\"out\"/>\n"        \
  45         "  </method>\n"                                                 \
  46         "  <method name=\"ListSessions\">\n"                            \
  47         "   <arg name=\"sessions\" type=\"a(susso)\" direction=\"out\"/>\n" \
  48         "  </method>\n"                                                 \
  49         "  <method name=\"ListUsers\">\n"                               \
  50         "   <arg name=\"users\" type=\"a(uso)\" direction=\"out\"/>\n"  \
  51         "  </method>\n"                                                 \
  52         "  <method name=\"ListSeats\">\n"                               \
  53         "   <arg name=\"seats\" type=\"a(so)\" direction=\"out\"/>\n"   \
  54         "  </method>\n"                                                 \
  55         "  <method name=\"CreateSession\">\n"                           \
  56         "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
  57         "   <arg name=\"leader\" type=\"u\" direction=\"in\"/>\n"       \
  58         "   <arg name=\"sevice\" type=\"s\" direction=\"in\"/>\n"       \
  59         "   <arg name=\"type\" type=\"s\" direction=\"in\"/>\n"         \
  60         "   <arg name=\"seat\" type=\"s\" direction=\"in\"/>\n"         \
  61         "   <arg name=\"vtnr\" type=\"u\" direction=\"in\"/>\n"         \
  62         "   <arg name=\"tty\" type=\"s\" direction=\"in\"/>\n"          \
  63         "   <arg name=\"display\" type=\"s\" direction=\"in\"/>\n"      \
  64         "   <arg name=\"remote\" type=\"b\" direction=\"in\"/>\n"       \
  65         "   <arg name=\"remote_user\" type=\"s\" direction=\"in\"/>\n"  \
  66         "   <arg name=\"remote_host\" type=\"s\" direction=\"in\"/>\n"  \
  67         "   <arg name=\"controllers\" type=\"as\" direction=\"in\"/>\n" \
  68         "   <arg name=\"reset_controllers\" type=\"as\" direction=\"in\"/>\n" \
  69         "   <arg name=\"kill_processes\" type=\"b\" direction=\"in\"/>\n" \
  70         "   <arg name=\"id\" type=\"s\" direction=\"out\"/>\n"          \
  71         "   <arg name=\"path\" type=\"o\" direction=\"out\"/>\n"        \
  72         "   <arg name=\"runtime_path\" type=\"o\" direction=\"out\"/>\n" \
  73         "   <arg name=\"fd\" type=\"h\" direction=\"out\"/>\n"          \
  74         "  </method>\n"                                                 \
  75         "  <method name=\"ActivateSession\">\n"                         \
  76         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  77         "  </method>\n"                                                 \
  78         "  <method name=\"LockSession\">\n"                             \
  79         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  80         "  </method>\n"                                                 \
  81         "  <method name=\"UnlockSession\">\n"                           \
  82         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  83         "  </method>\n"                                                 \
  84         "  <method name=\"KillSession\">\n"                             \
  85         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  86         "   <arg name=\"who\" type=\"s\"/>\n"                           \
  87         "   <arg name=\"signal\" type=\"s\"/>\n"                        \
  88         "  </method>\n"                                                 \
  89         "  <method name=\"KillUser\">\n"                                \
  90         "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
  91         "   <arg name=\"signal\" type=\"s\"/>\n"                        \
  92         "  </method>\n"                                                 \
  93         "  <method name=\"TerminateSession\">\n"                        \
  94         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  95         "  </method>\n"                                                 \
  96         "  <method name=\"TerminateUser\">\n"                           \
  97         "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
  98         "  </method>\n"                                                 \
  99         "  <method name=\"TerminateSeat\">\n"                           \
 100         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
 101         "  </method>\n"                                                 \
 102         "  <method name=\"SetUserLinger\">\n"                           \
 103         "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
 104         "   <arg name=\"b\" type=\"b\" direction=\"in\"/>\n"            \
 105         "   <arg name=\"interactive\" type=\"b\" direction=\"in\"/>\n"  \
 106         "  </method>\n"                                                 \
 107         "  <method name=\"AttachDevice\">\n"                            \
 108         "   <arg name=\"seat\" type=\"s\" direction=\"in\"/>\n"         \
 109         "   <arg name=\"sysfs\" type=\"s\" direction=\"in\"/>\n"        \
 110         "   <arg name=\"interactive\" type=\"b\" direction=\"in\"/>\n"  \
 111         "  </method>\n"                                                 \
 112         "  <method name=\"FlushDevices\">\n"                            \
 113         "   <arg name=\"interactive\" type=\"b\" direction=\"in\"/>\n"  \
 114         "  </method>\n"                                                 \
 115         "  <signal name=\"SessionNew\">\n"                              \
 116         "   <arg name=\"id\" type=\"s\"/>\n"                            \
 117         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 118         "  </signal>\n"                                                 \
 119         "  <signal name=\"SessionRemoved\">\n"                          \
 120         "   <arg name=\"id\" type=\"s\"/>\n"                            \
 121         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 122         "  </signal>\n"                                                 \
 123         "  <signal name=\"UserNew\">\n"                                 \
 124         "   <arg name=\"uid\" type=\"u\"/>\n"                           \
 125         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 126         "  </signal>\n"                                                 \
 127         "  <signal name=\"UserRemoved\">\n"                             \
 128         "   <arg name=\"uid\" type=\"u\"/>\n"                           \
 129         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 130         "  </signal>\n"                                                 \
 131         "  <signal name=\"SeatNew\">\n"                                 \
 132         "   <arg name=\"id\" type=\"s\"/>\n"                            \
 133         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 134         "  </signal>\n"                                                 \
 135         "  <signal name=\"SeatRemoved\">\n"                             \
 136         "   <arg name=\"id\" type=\"s\"/>\n"                            \
 137         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 138         "  </signal>\n"                                                 \
 139         "  <property name=\"ControlGroupHierarchy\" type=\"s\" access=\"read\"/>\n" \
 140         "  <property name=\"Controllers\" type=\"as\" access=\"read\"/>\n" \
 141         "  <property name=\"ResetControllers\" type=\"as\" access=\"read\"/>\n" \
 142         "  <property name=\"NAutoVTs\" type=\"u\" access=\"read\"/>\n" \
 143         "  <property name=\"KillOnlyUsers\" type=\"as\" access=\"read\"/>\n" \
 144         "  <property name=\"KillExcludeUsers\" type=\"as\" access=\"read\"/>\n" \
 145         "  <property name=\"KillUserProcesses\" type=\"b\" access=\"read\"/>\n" \
 146         "  <property name=\"IdleHint\" type=\"b\" access=\"read\"/>\n"  \
 147         "  <property name=\"IdleSinceHint\" type=\"t\" access=\"read\"/>\n" \
 148         "  <property name=\"IdleSinceHintMonotonic\" type=\"t\" access=\"read\"/>\n" \
 149         " </interface>\n"
 150
 151 #define INTROSPECTION_BEGIN                                             \
 152         DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                       \
 153         "<node>\n"                                                      \
 154         BUS_MANAGER_INTERFACE                                           \
 155         BUS_PROPERTIES_INTERFACE                                        \
 156         BUS_PEER_INTERFACE                                              \
 157         BUS_INTROSPECTABLE_INTERFACE
 158
 159 #define INTROSPECTION_END                                               \
 160         "</node>\n"
 161
 162 #define INTERFACES_LIST                              \
 163         BUS_GENERIC_INTERFACES_LIST                  \
 164         "org.freedesktop.login1.Manager\0"
 165
 166 static int bus_manager_append_idle_hint(DBusMessageIter *i, const char *property, void *data) {
 167         Manager *m = data;
 168         dbus_bool_t b;
 169
 170         assert(i);
 171         assert(property);
 172         assert(m);
 173
 174         b = manager_get_idle_hint(m, NULL) > 0;
 175         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
 176                 return -ENOMEM;
 177
 178         return 0;
 179 }
 180
 181 static int bus_manager_append_idle_hint_since(DBusMessageIter *i, const char *property, void *data) {
 182         Manager *m = data;
 183         dual_timestamp t;
 184         uint64_t u;
 185
 186         assert(i);
 187         assert(property);
 188         assert(m);
 189
 190         manager_get_idle_hint(m, &t);
 191         u = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
 192
 193         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u))
 194                 return -ENOMEM;
 195
 196         return 0;
 197 }
 198
 199 static int bus_manager_create_session(Manager *m, DBusMessage *message, DBusMessage **_reply) {
 200         Session *session = NULL;
 201         User *user = NULL;
 202         const char *type, *seat, *tty, *display, *remote_user, *remote_host, *service;
 203         uint32_t uid, leader, audit_id = 0;
 204         dbus_bool_t remote, kill_processes;
 205         char **controllers = NULL, **reset_controllers = NULL;
 206         SessionType t;
 207         Seat *s;
 208         DBusMessageIter iter;
 209         int r;
 210         char *id = NULL, *p;
 211         uint32_t vtnr = 0;
 212         int fifo_fd = -1;
 213         DBusMessage *reply = NULL;
 214         bool b;
 215
 216         assert(m);
 217         assert(message);
 218         assert(_reply);
 219
 220         if (!dbus_message_iter_init(message, &iter) ||
 221             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_UINT32)
 222                 return -EINVAL;
 223
 224         dbus_message_iter_get_basic(&iter, &uid);
 225
 226         if (!dbus_message_iter_next(&iter) ||
 227             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_UINT32)
 228                 return -EINVAL;
 229
 230         dbus_message_iter_get_basic(&iter, &leader);
 231
 232         if (leader <= 0 ||
 233             !dbus_message_iter_next(&iter) ||
 234             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 235                 return -EINVAL;
 236
 237         dbus_message_iter_get_basic(&iter, &service);
 238
 239         if (!dbus_message_iter_next(&iter) ||
 240             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 241                 return -EINVAL;
 242
 243         dbus_message_iter_get_basic(&iter, &type);
 244         t = session_type_from_string(type);
 245
 246         if (t < 0 ||
 247             !dbus_message_iter_next(&iter) ||
 248             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 249                 return -EINVAL;
 250
 251         dbus_message_iter_get_basic(&iter, &seat);
 252
 253         if (isempty(seat))
 254                 s = NULL;
 255         else {
 256                 s = hashmap_get(m->seats, seat);
 257                 if (!s)
 258                         return -ENOENT;
 259         }
 260
 261         if (!dbus_message_iter_next(&iter) ||
 262             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_UINT32)
 263                 return -EINVAL;
 264
 265         dbus_message_iter_get_basic(&iter, &vtnr);
 266
 267         if (!dbus_message_iter_next(&iter) ||
 268             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 269                 return -EINVAL;
 270
 271         dbus_message_iter_get_basic(&iter, &tty);
 272
 273         if (tty_is_vc(tty)) {
 274                 int v;
 275
 276                 if (!s)
 277                         s = m->vtconsole;
 278                 else if (s != m->vtconsole)
 279                         return -EINVAL;
 280
 281                 v = vtnr_from_tty(tty);
 282
 283                 if (v <= 0)
 284                         return v < 0 ? v : -EINVAL;
 285
 286                 if (vtnr <= 0)
 287                         vtnr = (uint32_t) v;
 288                 else if (vtnr != (uint32_t) v)
 289                         return -EINVAL;
 290
 291         } else if (!isempty(tty) && s && seat_is_vtconsole(s))
 292                 return -EINVAL;
 293
 294         if (s) {
 295                 if (seat_is_vtconsole(s)) {
 296                         if (vtnr <= 0 || vtnr > 63)
 297                                 return -EINVAL;
 298                 } else {
 299                         if (vtnr > 0)
 300                                 return -EINVAL;
 301                 }
 302         }
 303
 304         if (!dbus_message_iter_next(&iter) ||
 305             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 306                 return -EINVAL;
 307
 308         dbus_message_iter_get_basic(&iter, &display);
 309
 310         if (!dbus_message_iter_next(&iter) ||
 311             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_BOOLEAN)
 312                 return -EINVAL;
 313
 314         dbus_message_iter_get_basic(&iter, &remote);
 315
 316         if (!dbus_message_iter_next(&iter) ||
 317             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 318                 return -EINVAL;
 319
 320         dbus_message_iter_get_basic(&iter, &remote_user);
 321
 322         if (!dbus_message_iter_next(&iter) ||
 323             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 324                 return -EINVAL;
 325
 326         dbus_message_iter_get_basic(&iter, &remote_host);
 327
 328         if (!dbus_message_iter_next(&iter) ||
 329             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
 330             dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRING)
 331                 return -EINVAL;
 332
 333         r = bus_parse_strv_iter(&iter, &controllers);
 334         if (r < 0)
 335                 return -EINVAL;
 336
 337         if (strv_contains(controllers, "systemd") ||
 338             !dbus_message_iter_next(&iter) ||
 339             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
 340             dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRING) {
 341                 r = -EINVAL;
 342                 goto fail;
 343         }
 344
 345         r = bus_parse_strv_iter(&iter, &reset_controllers);
 346         if (r < 0)
 347                 goto fail;
 348
 349         if (strv_contains(reset_controllers, "systemd") ||
 350             !dbus_message_iter_next(&iter) ||
 351             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_BOOLEAN) {
 352                 r = -EINVAL;
 353                 goto fail;
 354         }
 355
 356         dbus_message_iter_get_basic(&iter, &kill_processes);
 357
 358         r = manager_add_user_by_uid(m, uid, &user);
 359         if (r < 0)
 360                 goto fail;
 361
 362         audit_session_from_pid(leader, &audit_id);
 363
 364         if (audit_id > 0) {
 365                 asprintf(&id, "%lu", (unsigned long) audit_id);
 366
 367                 if (!id) {
 368                         r = -ENOMEM;
 369                         goto fail;
 370                 }
 371
 372                 session = hashmap_get(m->sessions, id);
 373
 374                 if (session) {
 375
 376                         fifo_fd = session_create_fifo(session);
 377                         if (fifo_fd < 0) {
 378                                 r = fifo_fd;
 379                                 goto fail;
 380                         }
 381
 382                         /* Session already exists, client is probably
 383                          * something like "su" which changes uid but
 384                          * is still the same audit session */
 385
 386                         reply = dbus_message_new_method_return(message);
 387                         if (!reply) {
 388                                 r = -ENOMEM;
 389                                 goto fail;
 390                         }
 391
 392                         p = session_bus_path(session);
 393                         if (!p) {
 394                                 r = -ENOMEM;
 395                                 goto fail;
 396                         }
 397
 398                         b = dbus_message_append_args(
 399                                         reply,
 400                                         DBUS_TYPE_STRING, &session->id,
 401                                         DBUS_TYPE_OBJECT_PATH, &p,
 402                                         DBUS_TYPE_STRING, &session->user->runtime_path,
 403                                         DBUS_TYPE_UNIX_FD, &fifo_fd,
 404                                         DBUS_TYPE_INVALID);
 405                         free(p);
 406
 407                         if (!b) {
 408                                 r = -ENOMEM;
 409                                 goto fail;
 410                         }
 411
 412                         close_nointr_nofail(fifo_fd);
 413                         *_reply = reply;
 414
 415                         return 0;
 416                 }
 417
 418         } else {
 419                 do {
 420                         free(id);
 421                         asprintf(&id, "c%lu", ++m->session_counter);
 422
 423                         if (!id) {
 424                                 r = -ENOMEM;
 425                                 goto fail;
 426                         }
 427
 428                 } while (hashmap_get(m->sessions, id));
 429         }
 430
 431         r = manager_add_session(m, user, id, &session);
 432         free(id);
 433         if (r < 0)
 434                 goto fail;
 435
 436         session->leader = leader;
 437         session->audit_id = audit_id;
 438         session->type = t;
 439         session->remote = remote;
 440         session->controllers = controllers;
 441         session->reset_controllers = reset_controllers;
 442         session->kill_processes = kill_processes;
 443         session->vtnr = vtnr;
 444
 445         controllers = reset_controllers = NULL;
 446
 447         if (!isempty(tty)) {
 448                 session->tty = strdup(tty);
 449                 if (!session->tty) {
 450                         r = -ENOMEM;
 451                         goto fail;
 452                 }
 453         }
 454
 455         if (!isempty(display)) {
 456                 session->display = strdup(display);
 457                 if (!session->display) {
 458                         r = -ENOMEM;
 459                         goto fail;
 460                 }
 461         }
 462
 463         if (!isempty(remote_user)) {
 464                 session->remote_user = strdup(remote_user);
 465                 if (!session->remote_user) {
 466                         r = -ENOMEM;
 467                         goto fail;
 468                 }
 469         }
 470
 471         if (!isempty(remote_host)) {
 472                 session->remote_host = strdup(remote_host);
 473                 if (!session->remote_host) {
 474                         r = -ENOMEM;
 475                         goto fail;
 476                 }
 477         }
 478
 479         if (!isempty(service)) {
 480                 session->service = strdup(service);
 481                 if (!session->service) {
 482                         r = -ENOMEM;
 483                         goto fail;
 484                 }
 485         }
 486
 487         fifo_fd = session_create_fifo(session);
 488         if (fifo_fd < 0) {
 489                 r = fifo_fd;
 490                 goto fail;
 491         }
 492
 493         if (s) {
 494                 r = seat_attach_session(s, session);
 495                 if (r < 0)
 496                         goto fail;
 497         }
 498
 499         r = session_start(session);
 500         if (r < 0)
 501                 goto fail;
 502
 503         reply = dbus_message_new_method_return(message);
 504         if (!reply) {
 505                 r = -ENOMEM;
 506                 goto fail;
 507         }
 508
 509         p = session_bus_path(session);
 510         if (!p) {
 511                 r = -ENOMEM;
 512                 goto fail;
 513         }
 514
 515         b = dbus_message_append_args(
 516                         reply,
 517                         DBUS_TYPE_STRING, &session->id,
 518                         DBUS_TYPE_OBJECT_PATH, &p,
 519                         DBUS_TYPE_STRING, &session->user->runtime_path,
 520                         DBUS_TYPE_UNIX_FD, &fifo_fd,
 521                         DBUS_TYPE_INVALID);
 522         free(p);
 523
 524         if (!b) {
 525                 r = -ENOMEM;
 526                 goto fail;
 527         }
 528
 529         close_nointr_nofail(fifo_fd);
 530         *_reply = reply;
 531
 532         return 0;
 533
 534 fail:
 535         strv_free(controllers);
 536         strv_free(reset_controllers);
 537
 538         if (session)
 539                 session_add_to_gc_queue(session);
 540
 541         if (user)
 542                 user_add_to_gc_queue(user);
 543
 544         if (fifo_fd >= 0)
 545                 close_nointr_nofail(fifo_fd);
 546
 547         if (reply)
 548                 dbus_message_unref(reply);
 549
 550         return r;
 551 }
 552
 553 static int trigger_device(Manager *m, const char *prefix) {
 554         struct udev_enumerate *e;
 555         struct udev_list_entry *first, *item;
 556         int r;
 557
 558         assert(m);
 559
 560         e = udev_enumerate_new(m->udev);
 561         if (!e) {
 562                 r = -ENOMEM;
 563                 goto finish;
 564         }
 565
 566         if (udev_enumerate_scan_devices(e) < 0) {
 567                 r = -EIO;
 568                 goto finish;
 569         }
 570
 571         first = udev_enumerate_get_list_entry(e);
 572         udev_list_entry_foreach(item, first) {
 573                 char *t;
 574                 const char *p;
 575
 576                 p = udev_list_entry_get_name(item);
 577
 578                 if (prefix && !path_startswith(p, prefix))
 579                         continue;
 580
 581                 t = strappend(p, "/uevent");
 582                 if (!t) {
 583                         r = -ENOMEM;
 584                         goto finish;
 585                 }
 586
 587                 write_one_line_file(t, "change");
 588                 free(t);
 589         }
 590
 591         r = 0;
 592
 593 finish:
 594         if (e)
 595                 udev_enumerate_unref(e);
 596
 597         return r;
 598 }
 599
 600 static int attach_device(Manager *m, const char *seat, const char *sysfs) {
 601         struct udev_device *d;
 602         char *rule = NULL, *file = NULL;
 603         const char *id_for_seat;
 604         int r;
 605
 606         assert(m);
 607         assert(seat);
 608         assert(sysfs);
 609
 610         d = udev_device_new_from_syspath(m->udev, sysfs);
 611         if (!d)
 612                 return -ENODEV;
 613
 614         if (!udev_device_has_tag(d, "seat")) {
 615                 r = -ENODEV;
 616                 goto finish;
 617         }
 618
 619         id_for_seat = udev_device_get_property_value(d, "ID_FOR_SEAT");
 620         if (!id_for_seat) {
 621                 r = -ENODEV;
 622                 goto finish;
 623         }
 624
 625         if (asprintf(&file, "/etc/udev/rules.d/72-seat-%s.rules", id_for_seat) < 0) {
 626                 r = -ENOMEM;
 627                 goto finish;
 628         }
 629
 630         if (asprintf(&rule, "TAG==\"seat\", ENV{ID_FOR_SEAT}==\"%s\", ENV{ID_SEAT}=\"%s\"", id_for_seat, seat) < 0) {
 631                 r = -ENOMEM;
 632                 goto finish;
 633         }
 634
 635         mkdir_p("/etc/udev/rules.d", 0755);
 636         r = write_one_line_file_atomic(file, rule);
 637         if (r < 0)
 638                 goto finish;
 639
 640         r = trigger_device(m, sysfs);
 641
 642 finish:
 643         free(rule);
 644         free(file);
 645
 646         if (d)
 647                 udev_device_unref(d);
 648
 649         return r;
 650 }
 651
 652 static int flush_devices(Manager *m) {
 653         DIR *d;
 654
 655         assert(m);
 656
 657         d = opendir("/etc/udev/rules.d");
 658         if (!d) {
 659                 if (errno != ENOENT)
 660                         log_warning("Failed to open /etc/udev/rules.d: %m");
 661         } else {
 662                 struct dirent *de;
 663
 664                 while ((de = readdir(d))) {
 665
 666                         if (!dirent_is_file(de))
 667                                 continue;
 668
 669                         if (!startswith(de->d_name, "72-seat-"))
 670                                 continue;
 671
 672                         if (!endswith(de->d_name, ".rules"))
 673                                 continue;
 674
 675                         if (unlinkat(dirfd(d), de->d_name, 0) < 0)
 676                                 log_warning("Failed to unlink %s: %m", de->d_name);
 677                 }
 678
 679                 closedir(d);
 680         }
 681
 682         return trigger_device(m, NULL);
 683 }
 684
 685 static DBusHandlerResult manager_message_handler(
 686                 DBusConnection *connection,
 687                 DBusMessage *message,
 688                 void *userdata) {
 689
 690         Manager *m = userdata;
 691
 692         const BusProperty properties[] = {
 693                 { "org.freedesktop.login1.Manager", "ControlGroupHierarchy",  bus_property_append_string,   "s",  m->cgroup_path          },
 694                 { "org.freedesktop.login1.Manager", "Controllers",            bus_property_append_strv,     "as", m->controllers          },
 695                 { "org.freedesktop.login1.Manager", "ResetControllers",       bus_property_append_strv,     "as", m->reset_controllers    },
 696                 { "org.freedesktop.login1.Manager", "NAutoVTs",               bus_property_append_unsigned, "u",  &m->n_autovts           },
 697                 { "org.freedesktop.login1.Manager", "KillOnlyUsers",          bus_property_append_strv,     "as", m->kill_only_users      },
 698                 { "org.freedesktop.login1.Manager", "KillExcludeUsers",       bus_property_append_strv,     "as", m->kill_exclude_users   },
 699                 { "org.freedesktop.login1.Manager", "KillUserProcesses",      bus_property_append_bool,     "b",  &m->kill_user_processes },
 700                 { "org.freedesktop.login1.Manager", "IdleHint",               bus_manager_append_idle_hint, "b",  m                       },
 701                 { "org.freedesktop.login1.Manager", "IdleSinceHint",          bus_manager_append_idle_hint_since, "t", m                  },
 702                 { "org.freedesktop.login1.Manager", "IdleSinceHintMonotonic", bus_manager_append_idle_hint_since, "t", m                  },
 703                 { NULL, NULL, NULL, NULL, NULL }
 704         };
 705
 706         DBusError error;
 707         DBusMessage *reply = NULL;
 708         int r;
 709
 710         assert(connection);
 711         assert(message);
 712         assert(m);
 713
 714         dbus_error_init(&error);
 715
 716         if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetSession")) {
 717                 const char *name;
 718                 char *p;
 719                 Session *session;
 720                 bool b;
 721
 722                 if (!dbus_message_get_args(
 723                                     message,
 724                                     &error,
 725                                     DBUS_TYPE_STRING, &name,
 726                                     DBUS_TYPE_INVALID))
 727                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 728
 729                 session = hashmap_get(m->sessions, name);
 730                 if (!session)
 731                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 732
 733                 reply = dbus_message_new_method_return(message);
 734                 if (!reply)
 735                         goto oom;
 736
 737                 p = session_bus_path(session);
 738                 if (!p)
 739                         goto oom;
 740
 741                 b = dbus_message_append_args(
 742                                 reply,
 743                                 DBUS_TYPE_OBJECT_PATH, &p,
 744                                 DBUS_TYPE_INVALID);
 745                 free(p);
 746
 747                 if (!b)
 748                         goto oom;
 749
 750         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetUser")) {
 751                 uint32_t uid;
 752                 char *p;
 753                 User *user;
 754                 bool b;
 755
 756                 if (!dbus_message_get_args(
 757                                     message,
 758                                     &error,
 759                                     DBUS_TYPE_UINT32, &uid,
 760                                     DBUS_TYPE_INVALID))
 761                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 762
 763                 user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
 764                 if (!user)
 765                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 766
 767                 reply = dbus_message_new_method_return(message);
 768                 if (!reply)
 769                         goto oom;
 770
 771                 p = user_bus_path(user);
 772                 if (!p)
 773                         goto oom;
 774
 775                 b = dbus_message_append_args(
 776                                 reply,
 777                                 DBUS_TYPE_OBJECT_PATH, &p,
 778                                 DBUS_TYPE_INVALID);
 779                 free(p);
 780
 781                 if (!b)
 782                         goto oom;
 783
 784         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetSeat")) {
 785                 const char *name;
 786                 char *p;
 787                 Seat *seat;
 788                 bool b;
 789
 790                 if (!dbus_message_get_args(
 791                                     message,
 792                                     &error,
 793                                     DBUS_TYPE_STRING, &name,
 794                                     DBUS_TYPE_INVALID))
 795                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 796
 797                 seat = hashmap_get(m->seats, name);
 798                 if (!seat)
 799                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 800
 801                 reply = dbus_message_new_method_return(message);
 802                 if (!reply)
 803                         goto oom;
 804
 805                 p = seat_bus_path(seat);
 806                 if (!p)
 807                         goto oom;
 808
 809                 b = dbus_message_append_args(
 810                                 reply,
 811                                 DBUS_TYPE_OBJECT_PATH, &p,
 812                                 DBUS_TYPE_INVALID);
 813                 free(p);
 814
 815                 if (!b)
 816                         goto oom;
 817
 818         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListSessions")) {
 819                 char *p;
 820                 Session *session;
 821                 Iterator i;
 822                 DBusMessageIter iter, sub;
 823                 const char *empty = "";
 824
 825                 reply = dbus_message_new_method_return(message);
 826                 if (!reply)
 827                         goto oom;
 828
 829                 dbus_message_iter_init_append(reply, &iter);
 830
 831                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(susso)", &sub))
 832                         goto oom;
 833
 834                 HASHMAP_FOREACH(session, m->sessions, i) {
 835                         DBusMessageIter sub2;
 836                         uint32_t uid;
 837
 838                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 839                                 goto oom;
 840
 841                         uid = session->user->uid;
 842
 843                         p = session_bus_path(session);
 844                         if (!p)
 845                                 goto oom;
 846
 847                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &session->id) ||
 848                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT32, &uid) ||
 849                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &session->user->name) ||
 850                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, session->seat ? (const char**) &session->seat->id : &empty) ||
 851                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 852                                 free(p);
 853                                 goto oom;
 854                         }
 855
 856                         free(p);
 857
 858                         if (!dbus_message_iter_close_container(&sub, &sub2))
 859                                 goto oom;
 860                 }
 861
 862                 if (!dbus_message_iter_close_container(&iter, &sub))
 863                         goto oom;
 864
 865         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListUsers")) {
 866                 char *p;
 867                 User *user;
 868                 Iterator i;
 869                 DBusMessageIter iter, sub;
 870
 871                 reply = dbus_message_new_method_return(message);
 872                 if (!reply)
 873                         goto oom;
 874
 875                 dbus_message_iter_init_append(reply, &iter);
 876
 877                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(uso)", &sub))
 878                         goto oom;
 879
 880                 HASHMAP_FOREACH(user, m->users, i) {
 881                         DBusMessageIter sub2;
 882                         uint32_t uid;
 883
 884                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 885                                 goto oom;
 886
 887                         uid = user->uid;
 888
 889                         p = user_bus_path(user);
 890                         if (!p)
 891                                 goto oom;
 892
 893                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT32, &uid) ||
 894                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &user->name) ||
 895                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 896                                 free(p);
 897                                 goto oom;
 898                         }
 899
 900                         free(p);
 901
 902                         if (!dbus_message_iter_close_container(&sub, &sub2))
 903                                 goto oom;
 904                 }
 905
 906                 if (!dbus_message_iter_close_container(&iter, &sub))
 907                         goto oom;
 908
 909         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListSeats")) {
 910                 char *p;
 911                 Seat *seat;
 912                 Iterator i;
 913                 DBusMessageIter iter, sub;
 914
 915                 reply = dbus_message_new_method_return(message);
 916                 if (!reply)
 917                         goto oom;
 918
 919                 dbus_message_iter_init_append(reply, &iter);
 920
 921                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(so)", &sub))
 922                         goto oom;
 923
 924                 HASHMAP_FOREACH(seat, m->seats, i) {
 925                         DBusMessageIter sub2;
 926
 927                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 928                                 goto oom;
 929
 930                         p = seat_bus_path(seat);
 931                         if (!p)
 932                                 goto oom;
 933
 934                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &seat->id) ||
 935                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 936                                 free(p);
 937                                 goto oom;
 938                         }
 939
 940                         free(p);
 941
 942                         if (!dbus_message_iter_close_container(&sub, &sub2))
 943                                 goto oom;
 944                 }
 945
 946                 if (!dbus_message_iter_close_container(&iter, &sub))
 947                         goto oom;
 948
 949         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "CreateSession")) {
 950
 951                 r = bus_manager_create_session(m, message, &reply);
 952                 if (r == -ENOMEM)
 953                         goto oom;
 954
 955                 if (r < 0)
 956                         return bus_send_error_reply(connection, message, &error, r);
 957
 958         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ActivateSession")) {
 959                 const char *name;
 960                 Session *session;
 961
 962                 if (!dbus_message_get_args(
 963                                     message,
 964                                     &error,
 965                                     DBUS_TYPE_STRING, &name,
 966                                     DBUS_TYPE_INVALID))
 967                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 968
 969                 session = hashmap_get(m->sessions, name);
 970                 if (!session)
 971                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 972
 973                 r = session_activate(session);
 974                 if (r < 0)
 975                         return bus_send_error_reply(connection, message, NULL, r);
 976
 977                 reply = dbus_message_new_method_return(message);
 978                 if (!reply)
 979                         goto oom;
 980
 981         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "LockSession") ||
 982                    dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "UnlockSession")) {
 983                 const char *name;
 984                 Session *session;
 985
 986                 if (!dbus_message_get_args(
 987                                     message,
 988                                     &error,
 989                                     DBUS_TYPE_STRING, &name,
 990                                     DBUS_TYPE_INVALID))
 991                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 992
 993                 session = hashmap_get(m->sessions, name);
 994                 if (!session)
 995                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 996
 997                 if (session_send_lock(session, streq(dbus_message_get_member(message), "LockSession")) < 0)
 998                         goto oom;
 999
1000                 reply = dbus_message_new_method_return(message);
1001                 if (!reply)
1002                         goto oom;
1003
1004         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "KillSession")) {
1005                 const char *swho;
1006                 int32_t signo;
1007                 KillWho who;
1008                 const char *name;
1009                 Session *session;
1010
1011                 if (!dbus_message_get_args(
1012                                     message,
1013                                     &error,
1014                                     DBUS_TYPE_STRING, &name,
1015                                     DBUS_TYPE_STRING, &swho,
1016                                     DBUS_TYPE_INT32, &signo,
1017                                     DBUS_TYPE_INVALID))
1018                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1019
1020                 if (isempty(swho))
1021                         who = KILL_ALL;
1022                 else {
1023                         who = kill_who_from_string(swho);
1024                         if (who < 0)
1025                                 return bus_send_error_reply(connection, message, &error, -EINVAL);
1026                 }
1027
1028                 if (signo <= 0 || signo >= _NSIG)
1029                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1030
1031                 session = hashmap_get(m->sessions, name);
1032                 if (!session)
1033                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1034
1035                 r = session_kill(session, who, signo);
1036                 if (r < 0)
1037                         return bus_send_error_reply(connection, message, NULL, r);
1038
1039                 reply = dbus_message_new_method_return(message);
1040                 if (!reply)
1041                         goto oom;
1042
1043         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "KillUser")) {
1044                 uint32_t uid;
1045                 User *user;
1046                 int32_t signo;
1047
1048                 if (!dbus_message_get_args(
1049                                     message,
1050                                     &error,
1051                                     DBUS_TYPE_UINT32, &uid,
1052                                     DBUS_TYPE_INT32, &signo,
1053                                     DBUS_TYPE_INVALID))
1054                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1055
1056                 if (signo <= 0 || signo >= _NSIG)
1057                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1058
1059                 user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
1060                 if (!user)
1061                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1062
1063                 r = user_kill(user, signo);
1064                 if (r < 0)
1065                         return bus_send_error_reply(connection, message, NULL, r);
1066
1067                 reply = dbus_message_new_method_return(message);
1068                 if (!reply)
1069                         goto oom;
1070
1071         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateSession")) {
1072                 const char *name;
1073                 Session *session;
1074
1075                 if (!dbus_message_get_args(
1076                                     message,
1077                                     &error,
1078                                     DBUS_TYPE_STRING, &name,
1079                                     DBUS_TYPE_INVALID))
1080                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1081
1082                 session = hashmap_get(m->sessions, name);
1083                 if (!session)
1084                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1085
1086                 r = session_stop(session);
1087                 if (r < 0)
1088                         return bus_send_error_reply(connection, message, NULL, r);
1089
1090                 reply = dbus_message_new_method_return(message);
1091                 if (!reply)
1092                         goto oom;
1093
1094         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateUser")) {
1095                 uint32_t uid;
1096                 User *user;
1097
1098                 if (!dbus_message_get_args(
1099                                     message,
1100                                     &error,
1101                                     DBUS_TYPE_UINT32, &uid,
1102                                     DBUS_TYPE_INVALID))
1103                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1104
1105                 user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
1106                 if (!user)
1107                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1108
1109                 r = user_stop(user);
1110                 if (r < 0)
1111                         return bus_send_error_reply(connection, message, NULL, r);
1112
1113                 reply = dbus_message_new_method_return(message);
1114                 if (!reply)
1115                         goto oom;
1116
1117         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateSeat")) {
1118                 const char *name;
1119                 Seat *seat;
1120
1121                 if (!dbus_message_get_args(
1122                                     message,
1123                                     &error,
1124                                     DBUS_TYPE_STRING, &name,
1125                                     DBUS_TYPE_INVALID))
1126                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1127
1128                 seat = hashmap_get(m->seats, name);
1129                 if (!seat)
1130                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1131
1132                 r = seat_stop_sessions(seat);
1133                 if (r < 0)
1134                         return bus_send_error_reply(connection, message, NULL, r);
1135
1136                 reply = dbus_message_new_method_return(message);
1137                 if (!reply)
1138                         goto oom;
1139
1140         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "SetUserLinger")) {
1141                 uint32_t uid;
1142                 struct passwd *pw;
1143                 dbus_bool_t b, interactive;
1144                 char *path;
1145
1146                 if (!dbus_message_get_args(
1147                                     message,
1148                                     &error,
1149                                     DBUS_TYPE_UINT32, &uid,
1150                                     DBUS_TYPE_BOOLEAN, &b,
1151                                     DBUS_TYPE_BOOLEAN, &interactive,
1152                                     DBUS_TYPE_INVALID))
1153                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1154
1155                 errno = 0;
1156                 pw = getpwuid(uid);
1157                 if (!pw)
1158                         return bus_send_error_reply(connection, message, NULL, errno ? -errno : -EINVAL);
1159
1160                 r = verify_polkit(connection, message, "org.freedesktop.login1.set-user-linger", interactive, &error);
1161                 if (r < 0)
1162                         return bus_send_error_reply(connection, message, &error, r);
1163
1164                 r = safe_mkdir("/var/lib/systemd/linger", 0755, 0, 0);
1165                 if (r < 0)
1166                         return bus_send_error_reply(connection, message, &error, r);
1167
1168                 path = strappend("/var/lib/systemd/linger/", pw->pw_name);
1169                 if (!path)
1170                         goto oom;
1171
1172                 if (b) {
1173                         User *u;
1174
1175                         r = touch(path);
1176                         free(path);
1177
1178                         if (r < 0)
1179                                 return bus_send_error_reply(connection, message, &error, r);
1180
1181                         if (manager_add_user_by_uid(m, uid, &u) >= 0)
1182                                 user_start(u);
1183
1184                 } else {
1185                         User *u;
1186
1187                         r = unlink(path);
1188                         free(path);
1189
1190                         if (r < 0 && errno != ENOENT)
1191                                 return bus_send_error_reply(connection, message, &error, -errno);
1192
1193                         u = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
1194                         if (u)
1195                                 user_add_to_gc_queue(u);
1196                 }
1197
1198                 reply = dbus_message_new_method_return(message);
1199                 if (!reply)
1200                         goto oom;
1201
1202         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "AttachDevice")) {
1203                 const char *sysfs, *seat;
1204                 dbus_bool_t interactive;
1205
1206                 if (!dbus_message_get_args(
1207                                     message,
1208                                     &error,
1209                                     DBUS_TYPE_STRING, &seat,
1210                                     DBUS_TYPE_STRING, &sysfs,
1211                                     DBUS_TYPE_BOOLEAN, &interactive,
1212                                     DBUS_TYPE_INVALID))
1213                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1214
1215                 if (!path_startswith(sysfs, "/sys") || !seat_name_is_valid(seat))
1216                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
1217
1218                 r = verify_polkit(connection, message, "org.freedesktop.login1.attach-device", interactive, &error);
1219                 if (r < 0)
1220                         return bus_send_error_reply(connection, message, &error, r);
1221
1222                 r = attach_device(m, seat, sysfs);
1223                 if (r < 0)
1224                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
1225
1226                 reply = dbus_message_new_method_return(message);
1227                 if (!reply)
1228                         goto oom;
1229
1230
1231         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "FlushDevices")) {
1232                 dbus_bool_t interactive;
1233
1234                 if (!dbus_message_get_args(
1235                                     message,
1236                                     &error,
1237                                     DBUS_TYPE_BOOLEAN, &interactive,
1238                                     DBUS_TYPE_INVALID))
1239                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1240
1241                 r = verify_polkit(connection, message, "org.freedesktop.login1.flush-devices", interactive, &error);
1242                 if (r < 0)
1243                         return bus_send_error_reply(connection, message, &error, r);
1244
1245                 r = flush_devices(m);
1246                 if (r < 0)
1247                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
1248
1249                 reply = dbus_message_new_method_return(message);
1250                 if (!reply)
1251                         goto oom;
1252
1253         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect")) {
1254                 char *introspection = NULL;
1255                 FILE *f;
1256                 Iterator i;
1257                 Session *session;
1258                 Seat *seat;
1259                 User *user;
1260                 size_t size;
1261                 char *p;
1262
1263                 if (!(reply = dbus_message_new_method_return(message)))
1264                         goto oom;
1265
1266                 /* We roll our own introspection code here, instead of
1267                  * relying on bus_default_message_handler() because we
1268                  * need to generate our introspection string
1269                  * dynamically. */
1270
1271                 if (!(f = open_memstream(&introspection, &size)))
1272                         goto oom;
1273
1274                 fputs(INTROSPECTION_BEGIN, f);
1275
1276                 HASHMAP_FOREACH(seat, m->seats, i) {
1277                         p = bus_path_escape(seat->id);
1278
1279                         if (p) {
1280                                 fprintf(f, "<node name=\"seat/%s\"/>", p);
1281                                 free(p);
1282                         }
1283                 }
1284
1285                 HASHMAP_FOREACH(user, m->users, i)
1286                         fprintf(f, "<node name=\"user/%llu\"/>", (unsigned long long) user->uid);
1287
1288                 HASHMAP_FOREACH(session, m->sessions, i) {
1289                         p = bus_path_escape(session->id);
1290
1291                         if (p) {
1292                                 fprintf(f, "<node name=\"session/%s\"/>", p);
1293                                 free(p);
1294                         }
1295                 }
1296
1297                 fputs(INTROSPECTION_END, f);
1298
1299                 if (ferror(f)) {
1300                         fclose(f);
1301                         free(introspection);
1302                         goto oom;
1303                 }
1304
1305                 fclose(f);
1306
1307                 if (!introspection)
1308                         goto oom;
1309
1310                 if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID)) {
1311                         free(introspection);
1312                         goto oom;
1313                 }
1314
1315                 free(introspection);
1316         } else
1317                 return bus_default_message_handler(connection, message, NULL, INTERFACES_LIST, properties);
1318
1319         if (reply) {
1320                 if (!dbus_connection_send(connection, reply, NULL))
1321                         goto oom;
1322
1323                 dbus_message_unref(reply);
1324         }
1325
1326         return DBUS_HANDLER_RESULT_HANDLED;
1327
1328 oom:
1329         if (reply)
1330                 dbus_message_unref(reply);
1331
1332         dbus_error_free(&error);
1333
1334         return DBUS_HANDLER_RESULT_NEED_MEMORY;
1335 }
1336
1337 const DBusObjectPathVTable bus_manager_vtable = {
1338         .message_function = manager_message_handler
1339 };
1340
1341 DBusHandlerResult bus_message_filter(
1342                 DBusConnection *connection,
1343                 DBusMessage *message,
1344                 void *userdata) {
1345
1346         Manager *m = userdata;
1347         DBusError error;
1348
1349         assert(m);
1350         assert(connection);
1351         assert(message);
1352
1353         dbus_error_init(&error);
1354
1355         if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Agent", "Released")) {
1356                 const char *cgroup;
1357
1358                 if (!dbus_message_get_args(message, &error,
1359                                            DBUS_TYPE_STRING, &cgroup,
1360                                            DBUS_TYPE_INVALID))
1361                         log_error("Failed to parse Released message: %s", bus_error_message(&error));
1362                 else
1363                         manager_cgroup_notify_empty(m, cgroup);
1364         }
1365
1366         dbus_error_free(&error);
1367
1368         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
1369 }
1370
1371 int manager_send_changed(Manager *manager, const char *properties) {
1372         DBusMessage *m;
1373         int r = -ENOMEM;
1374
1375         assert(manager);
1376
1377         m = bus_properties_changed_new("/org/freedesktop/login1", "org.freedesktop.login1.Manager", properties);
1378         if (!m)
1379                 goto finish;
1380
1381         if (!dbus_connection_send(manager->bus, m, NULL))
1382                 goto finish;
1383
1384         r = 0;
1385
1386 finish:
1387         if (m)
1388                 dbus_message_unref(m);
1389
1390         return r;
1391 }