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 bool device_has_tag(struct udev_device *d, const char *tag) {
 554         struct udev_list_entry *first, *item;
 555
 556         assert(d);
 557         assert(tag);
 558
 559         /* FIXME */
 560         udev_device_get_is_initialized(d);
 561
 562         first = udev_device_get_tags_list_entry(d);
 563         udev_list_entry_foreach(item, first)
 564                 if (streq(udev_list_entry_get_name(item), tag))
 565                         return true;
 566
 567         return false;
 568 }
 569
 570 static int trigger_device(Manager *m, const char *prefix) {
 571         struct udev_enumerate *e;
 572         struct udev_list_entry *first, *item;
 573         int r;
 574
 575         assert(m);
 576
 577         e = udev_enumerate_new(m->udev);
 578         if (!e) {
 579                 r = -ENOMEM;
 580                 goto finish;
 581         }
 582
 583         if (udev_enumerate_scan_devices(e) < 0) {
 584                 r = -EIO;
 585                 goto finish;
 586         }
 587
 588         first = udev_enumerate_get_list_entry(e);
 589         udev_list_entry_foreach(item, first) {
 590                 char *t;
 591                 const char *p;
 592
 593                 p = udev_list_entry_get_name(item);
 594
 595                 if (prefix && !path_startswith(p, prefix))
 596                         continue;
 597
 598                 t = strappend(p, "/uevent");
 599                 if (!t) {
 600                         r = -ENOMEM;
 601                         goto finish;
 602                 }
 603
 604                 write_one_line_file(t, "change");
 605                 free(t);
 606         }
 607
 608         r = 0;
 609
 610 finish:
 611         if (e)
 612                 udev_enumerate_unref(e);
 613
 614         return r;
 615 }
 616
 617 static int attach_device(Manager *m, const char *seat, const char *sysfs) {
 618         struct udev_device *d;
 619         char *rule = NULL, *file = NULL;
 620         const char *id_for_seat;
 621         int r;
 622
 623         assert(m);
 624         assert(seat);
 625         assert(sysfs);
 626
 627         d = udev_device_new_from_syspath(m->udev, sysfs);
 628         if (!d)
 629                 return -ENODEV;
 630
 631         if (!device_has_tag(d, "seat")) {
 632                 r = -ENODEV;
 633                 goto finish;
 634         }
 635
 636         id_for_seat = udev_device_get_property_value(d, "ID_FOR_SEAT");
 637         if (!id_for_seat) {
 638                 r = -ENODEV;
 639                 goto finish;
 640         }
 641
 642         if (asprintf(&file, "/etc/udev/rules.d/72-seat-%s.rules", id_for_seat) < 0) {
 643                 r = -ENOMEM;
 644                 goto finish;
 645         }
 646
 647         if (asprintf(&rule, "TAG==\"seat\", ENV{ID_FOR_SEAT}==\"%s\", ENV{ID_SEAT}=\"%s\"", id_for_seat, seat) < 0) {
 648                 r = -ENOMEM;
 649                 goto finish;
 650         }
 651
 652         mkdir_p("/etc/udev/rules.d", 0755);
 653         r = write_one_line_file_atomic(file, rule);
 654         if (r < 0)
 655                 goto finish;
 656
 657         r = trigger_device(m, sysfs);
 658
 659 finish:
 660         free(rule);
 661         free(file);
 662
 663         if (d)
 664                 udev_device_unref(d);
 665
 666         return r;
 667 }
 668
 669 static int flush_devices(Manager *m) {
 670         DIR *d;
 671
 672         assert(m);
 673
 674         d = opendir("/etc/udev/rules.d");
 675         if (!d) {
 676                 if (errno != ENOENT)
 677                         log_warning("Failed to open /etc/udev/rules.d: %m");
 678         } else {
 679                 struct dirent *de;
 680
 681                 while ((de = readdir(d))) {
 682
 683                         if (!dirent_is_file(de))
 684                                 continue;
 685
 686                         if (!startswith(de->d_name, "72-seat-"))
 687                                 continue;
 688
 689                         if (!endswith(de->d_name, ".rules"))
 690                                 continue;
 691
 692                         if (unlinkat(dirfd(d), de->d_name, 0) < 0)
 693                                 log_warning("Failed to unlink %s: %m", de->d_name);
 694                 }
 695
 696                 closedir(d);
 697         }
 698
 699         return trigger_device(m, NULL);
 700 }
 701
 702 static DBusHandlerResult manager_message_handler(
 703                 DBusConnection *connection,
 704                 DBusMessage *message,
 705                 void *userdata) {
 706
 707         Manager *m = userdata;
 708
 709         const BusProperty properties[] = {
 710                 { "org.freedesktop.login1.Manager", "ControlGroupHierarchy",  bus_property_append_string,   "s",  m->cgroup_path          },
 711                 { "org.freedesktop.login1.Manager", "Controllers",            bus_property_append_strv,     "as", m->controllers          },
 712                 { "org.freedesktop.login1.Manager", "ResetControllers",       bus_property_append_strv,     "as", m->reset_controllers    },
 713                 { "org.freedesktop.login1.Manager", "NAutoVTs",               bus_property_append_unsigned, "u",  &m->n_autovts           },
 714                 { "org.freedesktop.login1.Manager", "KillOnlyUsers",          bus_property_append_strv,     "as", m->kill_only_users      },
 715                 { "org.freedesktop.login1.Manager", "KillExcludeUsers",       bus_property_append_strv,     "as", m->kill_exclude_users   },
 716                 { "org.freedesktop.login1.Manager", "KillUserProcesses",      bus_property_append_bool,     "b",  &m->kill_user_processes },
 717                 { "org.freedesktop.login1.Manager", "IdleHint",               bus_manager_append_idle_hint, "b",  m                       },
 718                 { "org.freedesktop.login1.Manager", "IdleSinceHint",          bus_manager_append_idle_hint_since, "t", m                  },
 719                 { "org.freedesktop.login1.Manager", "IdleSinceHintMonotonic", bus_manager_append_idle_hint_since, "t", m                  },
 720                 { NULL, NULL, NULL, NULL, NULL }
 721         };
 722
 723         DBusError error;
 724         DBusMessage *reply = NULL;
 725         int r;
 726
 727         assert(connection);
 728         assert(message);
 729         assert(m);
 730
 731         dbus_error_init(&error);
 732
 733         if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetSession")) {
 734                 const char *name;
 735                 char *p;
 736                 Session *session;
 737                 bool b;
 738
 739                 if (!dbus_message_get_args(
 740                                     message,
 741                                     &error,
 742                                     DBUS_TYPE_STRING, &name,
 743                                     DBUS_TYPE_INVALID))
 744                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 745
 746                 session = hashmap_get(m->sessions, name);
 747                 if (!session)
 748                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 749
 750                 reply = dbus_message_new_method_return(message);
 751                 if (!reply)
 752                         goto oom;
 753
 754                 p = session_bus_path(session);
 755                 if (!p)
 756                         goto oom;
 757
 758                 b = dbus_message_append_args(
 759                                 reply,
 760                                 DBUS_TYPE_OBJECT_PATH, &p,
 761                                 DBUS_TYPE_INVALID);
 762                 free(p);
 763
 764                 if (!b)
 765                         goto oom;
 766
 767         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetUser")) {
 768                 uint32_t uid;
 769                 char *p;
 770                 User *user;
 771                 bool b;
 772
 773                 if (!dbus_message_get_args(
 774                                     message,
 775                                     &error,
 776                                     DBUS_TYPE_UINT32, &uid,
 777                                     DBUS_TYPE_INVALID))
 778                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 779
 780                 user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
 781                 if (!user)
 782                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 783
 784                 reply = dbus_message_new_method_return(message);
 785                 if (!reply)
 786                         goto oom;
 787
 788                 p = user_bus_path(user);
 789                 if (!p)
 790                         goto oom;
 791
 792                 b = dbus_message_append_args(
 793                                 reply,
 794                                 DBUS_TYPE_OBJECT_PATH, &p,
 795                                 DBUS_TYPE_INVALID);
 796                 free(p);
 797
 798                 if (!b)
 799                         goto oom;
 800
 801         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetSeat")) {
 802                 const char *name;
 803                 char *p;
 804                 Seat *seat;
 805                 bool b;
 806
 807                 if (!dbus_message_get_args(
 808                                     message,
 809                                     &error,
 810                                     DBUS_TYPE_STRING, &name,
 811                                     DBUS_TYPE_INVALID))
 812                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 813
 814                 seat = hashmap_get(m->seats, name);
 815                 if (!seat)
 816                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 817
 818                 reply = dbus_message_new_method_return(message);
 819                 if (!reply)
 820                         goto oom;
 821
 822                 p = seat_bus_path(seat);
 823                 if (!p)
 824                         goto oom;
 825
 826                 b = dbus_message_append_args(
 827                                 reply,
 828                                 DBUS_TYPE_OBJECT_PATH, &p,
 829                                 DBUS_TYPE_INVALID);
 830                 free(p);
 831
 832                 if (!b)
 833                         goto oom;
 834
 835         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListSessions")) {
 836                 char *p;
 837                 Session *session;
 838                 Iterator i;
 839                 DBusMessageIter iter, sub;
 840                 const char *empty = "";
 841
 842                 reply = dbus_message_new_method_return(message);
 843                 if (!reply)
 844                         goto oom;
 845
 846                 dbus_message_iter_init_append(reply, &iter);
 847
 848                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(susso)", &sub))
 849                         goto oom;
 850
 851                 HASHMAP_FOREACH(session, m->sessions, i) {
 852                         DBusMessageIter sub2;
 853                         uint32_t uid;
 854
 855                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 856                                 goto oom;
 857
 858                         uid = session->user->uid;
 859
 860                         p = session_bus_path(session);
 861                         if (!p)
 862                                 goto oom;
 863
 864                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &session->id) ||
 865                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT32, &uid) ||
 866                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &session->user->name) ||
 867                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, session->seat ? (const char**) &session->seat->id : &empty) ||
 868                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 869                                 free(p);
 870                                 goto oom;
 871                         }
 872
 873                         free(p);
 874
 875                         if (!dbus_message_iter_close_container(&sub, &sub2))
 876                                 goto oom;
 877                 }
 878
 879                 if (!dbus_message_iter_close_container(&iter, &sub))
 880                         goto oom;
 881
 882         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListUsers")) {
 883                 char *p;
 884                 User *user;
 885                 Iterator i;
 886                 DBusMessageIter iter, sub;
 887
 888                 reply = dbus_message_new_method_return(message);
 889                 if (!reply)
 890                         goto oom;
 891
 892                 dbus_message_iter_init_append(reply, &iter);
 893
 894                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(uso)", &sub))
 895                         goto oom;
 896
 897                 HASHMAP_FOREACH(user, m->users, i) {
 898                         DBusMessageIter sub2;
 899                         uint32_t uid;
 900
 901                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 902                                 goto oom;
 903
 904                         uid = user->uid;
 905
 906                         p = user_bus_path(user);
 907                         if (!p)
 908                                 goto oom;
 909
 910                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT32, &uid) ||
 911                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &user->name) ||
 912                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 913                                 free(p);
 914                                 goto oom;
 915                         }
 916
 917                         free(p);
 918
 919                         if (!dbus_message_iter_close_container(&sub, &sub2))
 920                                 goto oom;
 921                 }
 922
 923                 if (!dbus_message_iter_close_container(&iter, &sub))
 924                         goto oom;
 925
 926         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListSeats")) {
 927                 char *p;
 928                 Seat *seat;
 929                 Iterator i;
 930                 DBusMessageIter iter, sub;
 931
 932                 reply = dbus_message_new_method_return(message);
 933                 if (!reply)
 934                         goto oom;
 935
 936                 dbus_message_iter_init_append(reply, &iter);
 937
 938                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(so)", &sub))
 939                         goto oom;
 940
 941                 HASHMAP_FOREACH(seat, m->seats, i) {
 942                         DBusMessageIter sub2;
 943
 944                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 945                                 goto oom;
 946
 947                         p = seat_bus_path(seat);
 948                         if (!p)
 949                                 goto oom;
 950
 951                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &seat->id) ||
 952                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 953                                 free(p);
 954                                 goto oom;
 955                         }
 956
 957                         free(p);
 958
 959                         if (!dbus_message_iter_close_container(&sub, &sub2))
 960                                 goto oom;
 961                 }
 962
 963                 if (!dbus_message_iter_close_container(&iter, &sub))
 964                         goto oom;
 965
 966         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "CreateSession")) {
 967
 968                 r = bus_manager_create_session(m, message, &reply);
 969                 if (r == -ENOMEM)
 970                         goto oom;
 971
 972                 if (r < 0)
 973                         return bus_send_error_reply(connection, message, &error, r);
 974
 975         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ActivateSession")) {
 976                 const char *name;
 977                 Session *session;
 978
 979                 if (!dbus_message_get_args(
 980                                     message,
 981                                     &error,
 982                                     DBUS_TYPE_STRING, &name,
 983                                     DBUS_TYPE_INVALID))
 984                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 985
 986                 session = hashmap_get(m->sessions, name);
 987                 if (!session)
 988                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 989
 990                 r = session_activate(session);
 991                 if (r < 0)
 992                         return bus_send_error_reply(connection, message, NULL, r);
 993
 994                 reply = dbus_message_new_method_return(message);
 995                 if (!reply)
 996                         goto oom;
 997
 998         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "LockSession") ||
 999                    dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "UnlockSession")) {
1000                 const char *name;
1001                 Session *session;
1002
1003                 if (!dbus_message_get_args(
1004                                     message,
1005                                     &error,
1006                                     DBUS_TYPE_STRING, &name,
1007                                     DBUS_TYPE_INVALID))
1008                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1009
1010                 session = hashmap_get(m->sessions, name);
1011                 if (!session)
1012                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1013
1014                 if (session_send_lock(session, streq(dbus_message_get_member(message), "LockSession")) < 0)
1015                         goto oom;
1016
1017                 reply = dbus_message_new_method_return(message);
1018                 if (!reply)
1019                         goto oom;
1020
1021         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "KillSession")) {
1022                 const char *swho;
1023                 int32_t signo;
1024                 KillWho who;
1025                 const char *name;
1026                 Session *session;
1027
1028                 if (!dbus_message_get_args(
1029                                     message,
1030                                     &error,
1031                                     DBUS_TYPE_STRING, &name,
1032                                     DBUS_TYPE_STRING, &swho,
1033                                     DBUS_TYPE_INT32, &signo,
1034                                     DBUS_TYPE_INVALID))
1035                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1036
1037                 if (isempty(swho))
1038                         who = KILL_ALL;
1039                 else {
1040                         who = kill_who_from_string(swho);
1041                         if (who < 0)
1042                                 return bus_send_error_reply(connection, message, &error, -EINVAL);
1043                 }
1044
1045                 if (signo <= 0 || signo >= _NSIG)
1046                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1047
1048                 session = hashmap_get(m->sessions, name);
1049                 if (!session)
1050                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1051
1052                 r = session_kill(session, who, signo);
1053                 if (r < 0)
1054                         return bus_send_error_reply(connection, message, NULL, r);
1055
1056                 reply = dbus_message_new_method_return(message);
1057                 if (!reply)
1058                         goto oom;
1059
1060         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "KillUser")) {
1061                 uint32_t uid;
1062                 User *user;
1063                 int32_t signo;
1064
1065                 if (!dbus_message_get_args(
1066                                     message,
1067                                     &error,
1068                                     DBUS_TYPE_UINT32, &uid,
1069                                     DBUS_TYPE_INT32, &signo,
1070                                     DBUS_TYPE_INVALID))
1071                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1072
1073                 if (signo <= 0 || signo >= _NSIG)
1074                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1075
1076                 user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
1077                 if (!user)
1078                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1079
1080                 r = user_kill(user, signo);
1081                 if (r < 0)
1082                         return bus_send_error_reply(connection, message, NULL, r);
1083
1084                 reply = dbus_message_new_method_return(message);
1085                 if (!reply)
1086                         goto oom;
1087
1088         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateSession")) {
1089                 const char *name;
1090                 Session *session;
1091
1092                 if (!dbus_message_get_args(
1093                                     message,
1094                                     &error,
1095                                     DBUS_TYPE_STRING, &name,
1096                                     DBUS_TYPE_INVALID))
1097                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1098
1099                 session = hashmap_get(m->sessions, name);
1100                 if (!session)
1101                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1102
1103                 r = session_stop(session);
1104                 if (r < 0)
1105                         return bus_send_error_reply(connection, message, NULL, r);
1106
1107                 reply = dbus_message_new_method_return(message);
1108                 if (!reply)
1109                         goto oom;
1110
1111         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateUser")) {
1112                 uint32_t uid;
1113                 User *user;
1114
1115                 if (!dbus_message_get_args(
1116                                     message,
1117                                     &error,
1118                                     DBUS_TYPE_UINT32, &uid,
1119                                     DBUS_TYPE_INVALID))
1120                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1121
1122                 user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
1123                 if (!user)
1124                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1125
1126                 r = user_stop(user);
1127                 if (r < 0)
1128                         return bus_send_error_reply(connection, message, NULL, r);
1129
1130                 reply = dbus_message_new_method_return(message);
1131                 if (!reply)
1132                         goto oom;
1133
1134         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateSeat")) {
1135                 const char *name;
1136                 Seat *seat;
1137
1138                 if (!dbus_message_get_args(
1139                                     message,
1140                                     &error,
1141                                     DBUS_TYPE_STRING, &name,
1142                                     DBUS_TYPE_INVALID))
1143                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1144
1145                 seat = hashmap_get(m->seats, name);
1146                 if (!seat)
1147                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1148
1149                 r = seat_stop_sessions(seat);
1150                 if (r < 0)
1151                         return bus_send_error_reply(connection, message, NULL, r);
1152
1153                 reply = dbus_message_new_method_return(message);
1154                 if (!reply)
1155                         goto oom;
1156
1157         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "SetUserLinger")) {
1158                 uint32_t uid;
1159                 struct passwd *pw;
1160                 dbus_bool_t b, interactive;
1161                 char *path;
1162
1163                 if (!dbus_message_get_args(
1164                                     message,
1165                                     &error,
1166                                     DBUS_TYPE_UINT32, &uid,
1167                                     DBUS_TYPE_BOOLEAN, &b,
1168                                     DBUS_TYPE_BOOLEAN, &interactive,
1169                                     DBUS_TYPE_INVALID))
1170                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1171
1172                 errno = 0;
1173                 pw = getpwuid(uid);
1174                 if (!pw)
1175                         return bus_send_error_reply(connection, message, NULL, errno ? -errno : -EINVAL);
1176
1177                 r = verify_polkit(connection, message, "org.freedesktop.login1.set-user-linger", interactive, &error);
1178                 if (r < 0)
1179                         return bus_send_error_reply(connection, message, &error, r);
1180
1181                 r = safe_mkdir("/var/lib/systemd/linger", 0755, 0, 0);
1182                 if (r < 0)
1183                         return bus_send_error_reply(connection, message, &error, r);
1184
1185                 path = strappend("/var/lib/systemd/linger/", pw->pw_name);
1186                 if (!path)
1187                         goto oom;
1188
1189                 if (b) {
1190                         User *u;
1191
1192                         r = touch(path);
1193                         free(path);
1194
1195                         if (r < 0)
1196                                 return bus_send_error_reply(connection, message, &error, r);
1197
1198                         if (manager_add_user_by_uid(m, uid, &u) >= 0)
1199                                 user_start(u);
1200
1201                 } else {
1202                         User *u;
1203
1204                         r = unlink(path);
1205                         free(path);
1206
1207                         if (r < 0 && errno != ENOENT)
1208                                 return bus_send_error_reply(connection, message, &error, -errno);
1209
1210                         u = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
1211                         if (u)
1212                                 user_add_to_gc_queue(u);
1213                 }
1214
1215                 reply = dbus_message_new_method_return(message);
1216                 if (!reply)
1217                         goto oom;
1218
1219         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "AttachDevice")) {
1220                 const char *sysfs, *seat;
1221                 dbus_bool_t interactive;
1222
1223                 if (!dbus_message_get_args(
1224                                     message,
1225                                     &error,
1226                                     DBUS_TYPE_STRING, &seat,
1227                                     DBUS_TYPE_STRING, &sysfs,
1228                                     DBUS_TYPE_BOOLEAN, &interactive,
1229                                     DBUS_TYPE_INVALID))
1230                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1231
1232                 if (!path_startswith(sysfs, "/sys") || !seat_name_is_valid(seat))
1233                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
1234
1235                 r = verify_polkit(connection, message, "org.freedesktop.login1.attach-device", interactive, &error);
1236                 if (r < 0)
1237                         return bus_send_error_reply(connection, message, &error, r);
1238
1239                 r = attach_device(m, seat, sysfs);
1240                 if (r < 0)
1241                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
1242
1243                 reply = dbus_message_new_method_return(message);
1244                 if (!reply)
1245                         goto oom;
1246
1247
1248         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "FlushDevices")) {
1249                 dbus_bool_t interactive;
1250
1251                 if (!dbus_message_get_args(
1252                                     message,
1253                                     &error,
1254                                     DBUS_TYPE_BOOLEAN, &interactive,
1255                                     DBUS_TYPE_INVALID))
1256                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1257
1258                 r = verify_polkit(connection, message, "org.freedesktop.login1.flush-devices", interactive, &error);
1259                 if (r < 0)
1260                         return bus_send_error_reply(connection, message, &error, r);
1261
1262                 r = flush_devices(m);
1263                 if (r < 0)
1264                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
1265
1266                 reply = dbus_message_new_method_return(message);
1267                 if (!reply)
1268                         goto oom;
1269
1270         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect")) {
1271                 char *introspection = NULL;
1272                 FILE *f;
1273                 Iterator i;
1274                 Session *session;
1275                 Seat *seat;
1276                 User *user;
1277                 size_t size;
1278                 char *p;
1279
1280                 if (!(reply = dbus_message_new_method_return(message)))
1281                         goto oom;
1282
1283                 /* We roll our own introspection code here, instead of
1284                  * relying on bus_default_message_handler() because we
1285                  * need to generate our introspection string
1286                  * dynamically. */
1287
1288                 if (!(f = open_memstream(&introspection, &size)))
1289                         goto oom;
1290
1291                 fputs(INTROSPECTION_BEGIN, f);
1292
1293                 HASHMAP_FOREACH(seat, m->seats, i) {
1294                         p = bus_path_escape(seat->id);
1295
1296                         if (p) {
1297                                 fprintf(f, "<node name=\"seat/%s\"/>", p);
1298                                 free(p);
1299                         }
1300                 }
1301
1302                 HASHMAP_FOREACH(user, m->users, i)
1303                         fprintf(f, "<node name=\"user/%llu\"/>", (unsigned long long) user->uid);
1304
1305                 HASHMAP_FOREACH(session, m->sessions, i) {
1306                         p = bus_path_escape(session->id);
1307
1308                         if (p) {
1309                                 fprintf(f, "<node name=\"session/%s\"/>", p);
1310                                 free(p);
1311                         }
1312                 }
1313
1314                 fputs(INTROSPECTION_END, f);
1315
1316                 if (ferror(f)) {
1317                         fclose(f);
1318                         free(introspection);
1319                         goto oom;
1320                 }
1321
1322                 fclose(f);
1323
1324                 if (!introspection)
1325                         goto oom;
1326
1327                 if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID)) {
1328                         free(introspection);
1329                         goto oom;
1330                 }
1331
1332                 free(introspection);
1333         } else
1334                 return bus_default_message_handler(connection, message, NULL, INTERFACES_LIST, properties);
1335
1336         if (reply) {
1337                 if (!dbus_connection_send(connection, reply, NULL))
1338                         goto oom;
1339
1340                 dbus_message_unref(reply);
1341         }
1342
1343         return DBUS_HANDLER_RESULT_HANDLED;
1344
1345 oom:
1346         if (reply)
1347                 dbus_message_unref(reply);
1348
1349         dbus_error_free(&error);
1350
1351         return DBUS_HANDLER_RESULT_NEED_MEMORY;
1352 }
1353
1354 const DBusObjectPathVTable bus_manager_vtable = {
1355         .message_function = manager_message_handler
1356 };
1357
1358 DBusHandlerResult bus_message_filter(
1359                 DBusConnection *connection,
1360                 DBusMessage *message,
1361                 void *userdata) {
1362
1363         Manager *m = userdata;
1364         DBusError error;
1365
1366         assert(m);
1367         assert(connection);
1368         assert(message);
1369
1370         dbus_error_init(&error);
1371
1372         if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Agent", "Released")) {
1373                 const char *cgroup;
1374
1375                 if (!dbus_message_get_args(message, &error,
1376                                            DBUS_TYPE_STRING, &cgroup,
1377                                            DBUS_TYPE_INVALID))
1378                         log_error("Failed to parse Released message: %s", bus_error_message(&error));
1379                 else
1380                         manager_cgroup_notify_empty(m, cgroup);
1381         }
1382
1383         dbus_error_free(&error);
1384
1385         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
1386 }
1387
1388 int manager_send_changed(Manager *manager, const char *properties) {
1389         DBusMessage *m;
1390         int r = -ENOMEM;
1391
1392         assert(manager);
1393
1394         m = bus_properties_changed_new("/org/freedesktop/login1", "org.freedesktop.login1.Manager", properties);
1395         if (!m)
1396                 goto finish;
1397
1398         if (!dbus_connection_send(manager->bus, m, NULL))
1399                 goto finish;
1400
1401         r = 0;
1402
1403 finish:
1404         if (m)
1405                 dbus_message_unref(m);
1406
1407         return r;
1408 }