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, struct udev_device *d) {
 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 (d) {
 567                 if (udev_enumerate_add_match_parent(e, d) < 0) {
 568                         r = -EIO;
 569                         goto finish;
 570                 }
 571         }
 572
 573
 574         if (udev_enumerate_scan_devices(e) < 0) {
 575                 r = -EIO;
 576                 goto finish;
 577         }
 578
 579         first = udev_enumerate_get_list_entry(e);
 580         udev_list_entry_foreach(item, first) {
 581                 char *t;
 582                 const char *p;
 583
 584                 p = udev_list_entry_get_name(item);
 585
 586                 t = strappend(p, "/uevent");
 587                 if (!t) {
 588                         r = -ENOMEM;
 589                         goto finish;
 590                 }
 591
 592                 write_one_line_file(t, "change");
 593                 free(t);
 594         }
 595
 596         r = 0;
 597
 598 finish:
 599         if (e)
 600                 udev_enumerate_unref(e);
 601
 602         return r;
 603 }
 604
 605 static int attach_device(Manager *m, const char *seat, const char *sysfs) {
 606         struct udev_device *d;
 607         char *rule = NULL, *file = NULL;
 608         const char *id_for_seat;
 609         int r;
 610
 611         assert(m);
 612         assert(seat);
 613         assert(sysfs);
 614
 615         d = udev_device_new_from_syspath(m->udev, sysfs);
 616         if (!d)
 617                 return -ENODEV;
 618
 619         if (!udev_device_has_tag(d, "seat")) {
 620                 r = -ENODEV;
 621                 goto finish;
 622         }
 623
 624         id_for_seat = udev_device_get_property_value(d, "ID_FOR_SEAT");
 625         if (!id_for_seat) {
 626                 r = -ENODEV;
 627                 goto finish;
 628         }
 629
 630         if (asprintf(&file, "/etc/udev/rules.d/72-seat-%s.rules", id_for_seat) < 0) {
 631                 r = -ENOMEM;
 632                 goto finish;
 633         }
 634
 635         if (asprintf(&rule, "TAG==\"seat\", ENV{ID_FOR_SEAT}==\"%s\", ENV{ID_SEAT}=\"%s\"", id_for_seat, seat) < 0) {
 636                 r = -ENOMEM;
 637                 goto finish;
 638         }
 639
 640         mkdir_p("/etc/udev/rules.d", 0755);
 641         r = write_one_line_file_atomic(file, rule);
 642         if (r < 0)
 643                 goto finish;
 644
 645         r = trigger_device(m, d);
 646
 647 finish:
 648         free(rule);
 649         free(file);
 650
 651         if (d)
 652                 udev_device_unref(d);
 653
 654         return r;
 655 }
 656
 657 static int flush_devices(Manager *m) {
 658         DIR *d;
 659
 660         assert(m);
 661
 662         d = opendir("/etc/udev/rules.d");
 663         if (!d) {
 664                 if (errno != ENOENT)
 665                         log_warning("Failed to open /etc/udev/rules.d: %m");
 666         } else {
 667                 struct dirent *de;
 668
 669                 while ((de = readdir(d))) {
 670
 671                         if (!dirent_is_file(de))
 672                                 continue;
 673
 674                         if (!startswith(de->d_name, "72-seat-"))
 675                                 continue;
 676
 677                         if (!endswith(de->d_name, ".rules"))
 678                                 continue;
 679
 680                         if (unlinkat(dirfd(d), de->d_name, 0) < 0)
 681                                 log_warning("Failed to unlink %s: %m", de->d_name);
 682                 }
 683
 684                 closedir(d);
 685         }
 686
 687         return trigger_device(m, NULL);
 688 }
 689
 690 static DBusHandlerResult manager_message_handler(
 691                 DBusConnection *connection,
 692                 DBusMessage *message,
 693                 void *userdata) {
 694
 695         Manager *m = userdata;
 696
 697         const BusProperty properties[] = {
 698                 { "org.freedesktop.login1.Manager", "ControlGroupHierarchy",  bus_property_append_string,   "s",  m->cgroup_path          },
 699                 { "org.freedesktop.login1.Manager", "Controllers",            bus_property_append_strv,     "as", m->controllers          },
 700                 { "org.freedesktop.login1.Manager", "ResetControllers",       bus_property_append_strv,     "as", m->reset_controllers    },
 701                 { "org.freedesktop.login1.Manager", "NAutoVTs",               bus_property_append_unsigned, "u",  &m->n_autovts           },
 702                 { "org.freedesktop.login1.Manager", "KillOnlyUsers",          bus_property_append_strv,     "as", m->kill_only_users      },
 703                 { "org.freedesktop.login1.Manager", "KillExcludeUsers",       bus_property_append_strv,     "as", m->kill_exclude_users   },
 704                 { "org.freedesktop.login1.Manager", "KillUserProcesses",      bus_property_append_bool,     "b",  &m->kill_user_processes },
 705                 { "org.freedesktop.login1.Manager", "IdleHint",               bus_manager_append_idle_hint, "b",  m                       },
 706                 { "org.freedesktop.login1.Manager", "IdleSinceHint",          bus_manager_append_idle_hint_since, "t", m                  },
 707                 { "org.freedesktop.login1.Manager", "IdleSinceHintMonotonic", bus_manager_append_idle_hint_since, "t", m                  },
 708                 { NULL, NULL, NULL, NULL, NULL }
 709         };
 710
 711         DBusError error;
 712         DBusMessage *reply = NULL;
 713         int r;
 714
 715         assert(connection);
 716         assert(message);
 717         assert(m);
 718
 719         dbus_error_init(&error);
 720
 721         if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetSession")) {
 722                 const char *name;
 723                 char *p;
 724                 Session *session;
 725                 bool b;
 726
 727                 if (!dbus_message_get_args(
 728                                     message,
 729                                     &error,
 730                                     DBUS_TYPE_STRING, &name,
 731                                     DBUS_TYPE_INVALID))
 732                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 733
 734                 session = hashmap_get(m->sessions, name);
 735                 if (!session)
 736                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 737
 738                 reply = dbus_message_new_method_return(message);
 739                 if (!reply)
 740                         goto oom;
 741
 742                 p = session_bus_path(session);
 743                 if (!p)
 744                         goto oom;
 745
 746                 b = dbus_message_append_args(
 747                                 reply,
 748                                 DBUS_TYPE_OBJECT_PATH, &p,
 749                                 DBUS_TYPE_INVALID);
 750                 free(p);
 751
 752                 if (!b)
 753                         goto oom;
 754
 755         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetUser")) {
 756                 uint32_t uid;
 757                 char *p;
 758                 User *user;
 759                 bool b;
 760
 761                 if (!dbus_message_get_args(
 762                                     message,
 763                                     &error,
 764                                     DBUS_TYPE_UINT32, &uid,
 765                                     DBUS_TYPE_INVALID))
 766                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 767
 768                 user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
 769                 if (!user)
 770                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 771
 772                 reply = dbus_message_new_method_return(message);
 773                 if (!reply)
 774                         goto oom;
 775
 776                 p = user_bus_path(user);
 777                 if (!p)
 778                         goto oom;
 779
 780                 b = dbus_message_append_args(
 781                                 reply,
 782                                 DBUS_TYPE_OBJECT_PATH, &p,
 783                                 DBUS_TYPE_INVALID);
 784                 free(p);
 785
 786                 if (!b)
 787                         goto oom;
 788
 789         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetSeat")) {
 790                 const char *name;
 791                 char *p;
 792                 Seat *seat;
 793                 bool b;
 794
 795                 if (!dbus_message_get_args(
 796                                     message,
 797                                     &error,
 798                                     DBUS_TYPE_STRING, &name,
 799                                     DBUS_TYPE_INVALID))
 800                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 801
 802                 seat = hashmap_get(m->seats, name);
 803                 if (!seat)
 804                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 805
 806                 reply = dbus_message_new_method_return(message);
 807                 if (!reply)
 808                         goto oom;
 809
 810                 p = seat_bus_path(seat);
 811                 if (!p)
 812                         goto oom;
 813
 814                 b = dbus_message_append_args(
 815                                 reply,
 816                                 DBUS_TYPE_OBJECT_PATH, &p,
 817                                 DBUS_TYPE_INVALID);
 818                 free(p);
 819
 820                 if (!b)
 821                         goto oom;
 822
 823         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListSessions")) {
 824                 char *p;
 825                 Session *session;
 826                 Iterator i;
 827                 DBusMessageIter iter, sub;
 828                 const char *empty = "";
 829
 830                 reply = dbus_message_new_method_return(message);
 831                 if (!reply)
 832                         goto oom;
 833
 834                 dbus_message_iter_init_append(reply, &iter);
 835
 836                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(susso)", &sub))
 837                         goto oom;
 838
 839                 HASHMAP_FOREACH(session, m->sessions, i) {
 840                         DBusMessageIter sub2;
 841                         uint32_t uid;
 842
 843                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 844                                 goto oom;
 845
 846                         uid = session->user->uid;
 847
 848                         p = session_bus_path(session);
 849                         if (!p)
 850                                 goto oom;
 851
 852                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &session->id) ||
 853                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT32, &uid) ||
 854                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &session->user->name) ||
 855                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, session->seat ? (const char**) &session->seat->id : &empty) ||
 856                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 857                                 free(p);
 858                                 goto oom;
 859                         }
 860
 861                         free(p);
 862
 863                         if (!dbus_message_iter_close_container(&sub, &sub2))
 864                                 goto oom;
 865                 }
 866
 867                 if (!dbus_message_iter_close_container(&iter, &sub))
 868                         goto oom;
 869
 870         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListUsers")) {
 871                 char *p;
 872                 User *user;
 873                 Iterator i;
 874                 DBusMessageIter iter, sub;
 875
 876                 reply = dbus_message_new_method_return(message);
 877                 if (!reply)
 878                         goto oom;
 879
 880                 dbus_message_iter_init_append(reply, &iter);
 881
 882                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(uso)", &sub))
 883                         goto oom;
 884
 885                 HASHMAP_FOREACH(user, m->users, i) {
 886                         DBusMessageIter sub2;
 887                         uint32_t uid;
 888
 889                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 890                                 goto oom;
 891
 892                         uid = user->uid;
 893
 894                         p = user_bus_path(user);
 895                         if (!p)
 896                                 goto oom;
 897
 898                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT32, &uid) ||
 899                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &user->name) ||
 900                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 901                                 free(p);
 902                                 goto oom;
 903                         }
 904
 905                         free(p);
 906
 907                         if (!dbus_message_iter_close_container(&sub, &sub2))
 908                                 goto oom;
 909                 }
 910
 911                 if (!dbus_message_iter_close_container(&iter, &sub))
 912                         goto oom;
 913
 914         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListSeats")) {
 915                 char *p;
 916                 Seat *seat;
 917                 Iterator i;
 918                 DBusMessageIter iter, sub;
 919
 920                 reply = dbus_message_new_method_return(message);
 921                 if (!reply)
 922                         goto oom;
 923
 924                 dbus_message_iter_init_append(reply, &iter);
 925
 926                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(so)", &sub))
 927                         goto oom;
 928
 929                 HASHMAP_FOREACH(seat, m->seats, i) {
 930                         DBusMessageIter sub2;
 931
 932                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 933                                 goto oom;
 934
 935                         p = seat_bus_path(seat);
 936                         if (!p)
 937                                 goto oom;
 938
 939                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &seat->id) ||
 940                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 941                                 free(p);
 942                                 goto oom;
 943                         }
 944
 945                         free(p);
 946
 947                         if (!dbus_message_iter_close_container(&sub, &sub2))
 948                                 goto oom;
 949                 }
 950
 951                 if (!dbus_message_iter_close_container(&iter, &sub))
 952                         goto oom;
 953
 954         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "CreateSession")) {
 955
 956                 r = bus_manager_create_session(m, message, &reply);
 957                 if (r == -ENOMEM)
 958                         goto oom;
 959
 960                 if (r < 0)
 961                         return bus_send_error_reply(connection, message, &error, r);
 962
 963         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ActivateSession")) {
 964                 const char *name;
 965                 Session *session;
 966
 967                 if (!dbus_message_get_args(
 968                                     message,
 969                                     &error,
 970                                     DBUS_TYPE_STRING, &name,
 971                                     DBUS_TYPE_INVALID))
 972                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 973
 974                 session = hashmap_get(m->sessions, name);
 975                 if (!session)
 976                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 977
 978                 r = session_activate(session);
 979                 if (r < 0)
 980                         return bus_send_error_reply(connection, message, NULL, r);
 981
 982                 reply = dbus_message_new_method_return(message);
 983                 if (!reply)
 984                         goto oom;
 985
 986         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "LockSession") ||
 987                    dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "UnlockSession")) {
 988                 const char *name;
 989                 Session *session;
 990
 991                 if (!dbus_message_get_args(
 992                                     message,
 993                                     &error,
 994                                     DBUS_TYPE_STRING, &name,
 995                                     DBUS_TYPE_INVALID))
 996                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 997
 998                 session = hashmap_get(m->sessions, name);
 999                 if (!session)
1000                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1001
1002                 if (session_send_lock(session, streq(dbus_message_get_member(message), "LockSession")) < 0)
1003                         goto oom;
1004
1005                 reply = dbus_message_new_method_return(message);
1006                 if (!reply)
1007                         goto oom;
1008
1009         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "KillSession")) {
1010                 const char *swho;
1011                 int32_t signo;
1012                 KillWho who;
1013                 const char *name;
1014                 Session *session;
1015
1016                 if (!dbus_message_get_args(
1017                                     message,
1018                                     &error,
1019                                     DBUS_TYPE_STRING, &name,
1020                                     DBUS_TYPE_STRING, &swho,
1021                                     DBUS_TYPE_INT32, &signo,
1022                                     DBUS_TYPE_INVALID))
1023                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1024
1025                 if (isempty(swho))
1026                         who = KILL_ALL;
1027                 else {
1028                         who = kill_who_from_string(swho);
1029                         if (who < 0)
1030                                 return bus_send_error_reply(connection, message, &error, -EINVAL);
1031                 }
1032
1033                 if (signo <= 0 || signo >= _NSIG)
1034                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1035
1036                 session = hashmap_get(m->sessions, name);
1037                 if (!session)
1038                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1039
1040                 r = session_kill(session, who, signo);
1041                 if (r < 0)
1042                         return bus_send_error_reply(connection, message, NULL, r);
1043
1044                 reply = dbus_message_new_method_return(message);
1045                 if (!reply)
1046                         goto oom;
1047
1048         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "KillUser")) {
1049                 uint32_t uid;
1050                 User *user;
1051                 int32_t signo;
1052
1053                 if (!dbus_message_get_args(
1054                                     message,
1055                                     &error,
1056                                     DBUS_TYPE_UINT32, &uid,
1057                                     DBUS_TYPE_INT32, &signo,
1058                                     DBUS_TYPE_INVALID))
1059                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1060
1061                 if (signo <= 0 || signo >= _NSIG)
1062                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1063
1064                 user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
1065                 if (!user)
1066                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1067
1068                 r = user_kill(user, signo);
1069                 if (r < 0)
1070                         return bus_send_error_reply(connection, message, NULL, r);
1071
1072                 reply = dbus_message_new_method_return(message);
1073                 if (!reply)
1074                         goto oom;
1075
1076         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateSession")) {
1077                 const char *name;
1078                 Session *session;
1079
1080                 if (!dbus_message_get_args(
1081                                     message,
1082                                     &error,
1083                                     DBUS_TYPE_STRING, &name,
1084                                     DBUS_TYPE_INVALID))
1085                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1086
1087                 session = hashmap_get(m->sessions, name);
1088                 if (!session)
1089                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1090
1091                 r = session_stop(session);
1092                 if (r < 0)
1093                         return bus_send_error_reply(connection, message, NULL, r);
1094
1095                 reply = dbus_message_new_method_return(message);
1096                 if (!reply)
1097                         goto oom;
1098
1099         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateUser")) {
1100                 uint32_t uid;
1101                 User *user;
1102
1103                 if (!dbus_message_get_args(
1104                                     message,
1105                                     &error,
1106                                     DBUS_TYPE_UINT32, &uid,
1107                                     DBUS_TYPE_INVALID))
1108                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1109
1110                 user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
1111                 if (!user)
1112                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1113
1114                 r = user_stop(user);
1115                 if (r < 0)
1116                         return bus_send_error_reply(connection, message, NULL, r);
1117
1118                 reply = dbus_message_new_method_return(message);
1119                 if (!reply)
1120                         goto oom;
1121
1122         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateSeat")) {
1123                 const char *name;
1124                 Seat *seat;
1125
1126                 if (!dbus_message_get_args(
1127                                     message,
1128                                     &error,
1129                                     DBUS_TYPE_STRING, &name,
1130                                     DBUS_TYPE_INVALID))
1131                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1132
1133                 seat = hashmap_get(m->seats, name);
1134                 if (!seat)
1135                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1136
1137                 r = seat_stop_sessions(seat);
1138                 if (r < 0)
1139                         return bus_send_error_reply(connection, message, NULL, r);
1140
1141                 reply = dbus_message_new_method_return(message);
1142                 if (!reply)
1143                         goto oom;
1144
1145         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "SetUserLinger")) {
1146                 uint32_t uid;
1147                 struct passwd *pw;
1148                 dbus_bool_t b, interactive;
1149                 char *path;
1150
1151                 if (!dbus_message_get_args(
1152                                     message,
1153                                     &error,
1154                                     DBUS_TYPE_UINT32, &uid,
1155                                     DBUS_TYPE_BOOLEAN, &b,
1156                                     DBUS_TYPE_BOOLEAN, &interactive,
1157                                     DBUS_TYPE_INVALID))
1158                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1159
1160                 errno = 0;
1161                 pw = getpwuid(uid);
1162                 if (!pw)
1163                         return bus_send_error_reply(connection, message, NULL, errno ? -errno : -EINVAL);
1164
1165                 r = verify_polkit(connection, message, "org.freedesktop.login1.set-user-linger", interactive, &error);
1166                 if (r < 0)
1167                         return bus_send_error_reply(connection, message, &error, r);
1168
1169                 r = safe_mkdir("/var/lib/systemd/linger", 0755, 0, 0);
1170                 if (r < 0)
1171                         return bus_send_error_reply(connection, message, &error, r);
1172
1173                 path = strappend("/var/lib/systemd/linger/", pw->pw_name);
1174                 if (!path)
1175                         goto oom;
1176
1177                 if (b) {
1178                         User *u;
1179
1180                         r = touch(path);
1181                         free(path);
1182
1183                         if (r < 0)
1184                                 return bus_send_error_reply(connection, message, &error, r);
1185
1186                         if (manager_add_user_by_uid(m, uid, &u) >= 0)
1187                                 user_start(u);
1188
1189                 } else {
1190                         User *u;
1191
1192                         r = unlink(path);
1193                         free(path);
1194
1195                         if (r < 0 && errno != ENOENT)
1196                                 return bus_send_error_reply(connection, message, &error, -errno);
1197
1198                         u = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
1199                         if (u)
1200                                 user_add_to_gc_queue(u);
1201                 }
1202
1203                 reply = dbus_message_new_method_return(message);
1204                 if (!reply)
1205                         goto oom;
1206
1207         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "AttachDevice")) {
1208                 const char *sysfs, *seat;
1209                 dbus_bool_t interactive;
1210
1211                 if (!dbus_message_get_args(
1212                                     message,
1213                                     &error,
1214                                     DBUS_TYPE_STRING, &seat,
1215                                     DBUS_TYPE_STRING, &sysfs,
1216                                     DBUS_TYPE_BOOLEAN, &interactive,
1217                                     DBUS_TYPE_INVALID))
1218                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1219
1220                 if (!path_startswith(sysfs, "/sys") || !seat_name_is_valid(seat))
1221                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
1222
1223                 r = verify_polkit(connection, message, "org.freedesktop.login1.attach-device", interactive, &error);
1224                 if (r < 0)
1225                         return bus_send_error_reply(connection, message, &error, r);
1226
1227                 r = attach_device(m, seat, sysfs);
1228                 if (r < 0)
1229                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
1230
1231                 reply = dbus_message_new_method_return(message);
1232                 if (!reply)
1233                         goto oom;
1234
1235
1236         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "FlushDevices")) {
1237                 dbus_bool_t interactive;
1238
1239                 if (!dbus_message_get_args(
1240                                     message,
1241                                     &error,
1242                                     DBUS_TYPE_BOOLEAN, &interactive,
1243                                     DBUS_TYPE_INVALID))
1244                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1245
1246                 r = verify_polkit(connection, message, "org.freedesktop.login1.flush-devices", interactive, &error);
1247                 if (r < 0)
1248                         return bus_send_error_reply(connection, message, &error, r);
1249
1250                 r = flush_devices(m);
1251                 if (r < 0)
1252                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
1253
1254                 reply = dbus_message_new_method_return(message);
1255                 if (!reply)
1256                         goto oom;
1257
1258         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect")) {
1259                 char *introspection = NULL;
1260                 FILE *f;
1261                 Iterator i;
1262                 Session *session;
1263                 Seat *seat;
1264                 User *user;
1265                 size_t size;
1266                 char *p;
1267
1268                 if (!(reply = dbus_message_new_method_return(message)))
1269                         goto oom;
1270
1271                 /* We roll our own introspection code here, instead of
1272                  * relying on bus_default_message_handler() because we
1273                  * need to generate our introspection string
1274                  * dynamically. */
1275
1276                 if (!(f = open_memstream(&introspection, &size)))
1277                         goto oom;
1278
1279                 fputs(INTROSPECTION_BEGIN, f);
1280
1281                 HASHMAP_FOREACH(seat, m->seats, i) {
1282                         p = bus_path_escape(seat->id);
1283
1284                         if (p) {
1285                                 fprintf(f, "<node name=\"seat/%s\"/>", p);
1286                                 free(p);
1287                         }
1288                 }
1289
1290                 HASHMAP_FOREACH(user, m->users, i)
1291                         fprintf(f, "<node name=\"user/%llu\"/>", (unsigned long long) user->uid);
1292
1293                 HASHMAP_FOREACH(session, m->sessions, i) {
1294                         p = bus_path_escape(session->id);
1295
1296                         if (p) {
1297                                 fprintf(f, "<node name=\"session/%s\"/>", p);
1298                                 free(p);
1299                         }
1300                 }
1301
1302                 fputs(INTROSPECTION_END, f);
1303
1304                 if (ferror(f)) {
1305                         fclose(f);
1306                         free(introspection);
1307                         goto oom;
1308                 }
1309
1310                 fclose(f);
1311
1312                 if (!introspection)
1313                         goto oom;
1314
1315                 if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID)) {
1316                         free(introspection);
1317                         goto oom;
1318                 }
1319
1320                 free(introspection);
1321         } else
1322                 return bus_default_message_handler(connection, message, NULL, INTERFACES_LIST, properties);
1323
1324         if (reply) {
1325                 if (!dbus_connection_send(connection, reply, NULL))
1326                         goto oom;
1327
1328                 dbus_message_unref(reply);
1329         }
1330
1331         return DBUS_HANDLER_RESULT_HANDLED;
1332
1333 oom:
1334         if (reply)
1335                 dbus_message_unref(reply);
1336
1337         dbus_error_free(&error);
1338
1339         return DBUS_HANDLER_RESULT_NEED_MEMORY;
1340 }
1341
1342 const DBusObjectPathVTable bus_manager_vtable = {
1343         .message_function = manager_message_handler
1344 };
1345
1346 DBusHandlerResult bus_message_filter(
1347                 DBusConnection *connection,
1348                 DBusMessage *message,
1349                 void *userdata) {
1350
1351         Manager *m = userdata;
1352         DBusError error;
1353
1354         assert(m);
1355         assert(connection);
1356         assert(message);
1357
1358         dbus_error_init(&error);
1359
1360         if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Agent", "Released")) {
1361                 const char *cgroup;
1362
1363                 if (!dbus_message_get_args(message, &error,
1364                                            DBUS_TYPE_STRING, &cgroup,
1365                                            DBUS_TYPE_INVALID))
1366                         log_error("Failed to parse Released message: %s", bus_error_message(&error));
1367                 else
1368                         manager_cgroup_notify_empty(m, cgroup);
1369         }
1370
1371         dbus_error_free(&error);
1372
1373         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
1374 }
1375
1376 int manager_send_changed(Manager *manager, const char *properties) {
1377         DBusMessage *m;
1378         int r = -ENOMEM;
1379
1380         assert(manager);
1381
1382         m = bus_properties_changed_new("/org/freedesktop/login1", "org.freedesktop.login1.Manager", properties);
1383         if (!m)
1384                 goto finish;
1385
1386         if (!dbus_connection_send(manager->bus, m, NULL))
1387                 goto finish;
1388
1389         r = 0;
1390
1391 finish:
1392         if (m)
1393                 dbus_message_unref(m);
1394
1395         return r;
1396 }