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 #include "special.h"
  32
  33 #define BUS_MANAGER_INTERFACE                                           \
  34         " <interface name=\"org.freedesktop.login1.Manager\">\n"        \
  35         "  <method name=\"GetSession\">\n"                              \
  36         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  37         "   <arg name=\"session\" type=\"o\" direction=\"out\"/>\n"     \
  38         "  </method>\n"                                                 \
  39         "  <method name=\"GetUser\">\n"                                 \
  40         "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
  41         "   <arg name=\"user\" type=\"o\" direction=\"out\"/>\n"        \
  42         "  </method>\n"                                                 \
  43         "  <method name=\"GetSeat\">\n"                                 \
  44         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  45         "   <arg name=\"seat\" type=\"o\" direction=\"out\"/>\n"        \
  46         "  </method>\n"                                                 \
  47         "  <method name=\"ListSessions\">\n"                            \
  48         "   <arg name=\"sessions\" type=\"a(susso)\" direction=\"out\"/>\n" \
  49         "  </method>\n"                                                 \
  50         "  <method name=\"ListUsers\">\n"                               \
  51         "   <arg name=\"users\" type=\"a(uso)\" direction=\"out\"/>\n"  \
  52         "  </method>\n"                                                 \
  53         "  <method name=\"ListSeats\">\n"                               \
  54         "   <arg name=\"seats\" type=\"a(so)\" direction=\"out\"/>\n"   \
  55         "  </method>\n"                                                 \
  56         "  <method name=\"CreateSession\">\n"                           \
  57         "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
  58         "   <arg name=\"leader\" type=\"u\" direction=\"in\"/>\n"       \
  59         "   <arg name=\"sevice\" type=\"s\" direction=\"in\"/>\n"       \
  60         "   <arg name=\"type\" type=\"s\" direction=\"in\"/>\n"         \
  61         "   <arg name=\"seat\" type=\"s\" direction=\"in\"/>\n"         \
  62         "   <arg name=\"vtnr\" type=\"u\" direction=\"in\"/>\n"         \
  63         "   <arg name=\"tty\" type=\"s\" direction=\"in\"/>\n"          \
  64         "   <arg name=\"display\" type=\"s\" direction=\"in\"/>\n"      \
  65         "   <arg name=\"remote\" type=\"b\" direction=\"in\"/>\n"       \
  66         "   <arg name=\"remote_user\" type=\"s\" direction=\"in\"/>\n"  \
  67         "   <arg name=\"remote_host\" type=\"s\" direction=\"in\"/>\n"  \
  68         "   <arg name=\"controllers\" type=\"as\" direction=\"in\"/>\n" \
  69         "   <arg name=\"reset_controllers\" type=\"as\" direction=\"in\"/>\n" \
  70         "   <arg name=\"kill_processes\" type=\"b\" direction=\"in\"/>\n" \
  71         "   <arg name=\"id\" type=\"s\" direction=\"out\"/>\n"          \
  72         "   <arg name=\"path\" type=\"o\" direction=\"out\"/>\n"        \
  73         "   <arg name=\"runtime_path\" type=\"o\" direction=\"out\"/>\n" \
  74         "   <arg name=\"fd\" type=\"h\" direction=\"out\"/>\n"          \
  75         "  </method>\n"                                                 \
  76         "  <method name=\"ActivateSession\">\n"                         \
  77         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  78         "  </method>\n"                                                 \
  79         "  <method name=\"LockSession\">\n"                             \
  80         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  81         "  </method>\n"                                                 \
  82         "  <method name=\"UnlockSession\">\n"                           \
  83         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  84         "  </method>\n"                                                 \
  85         "  <method name=\"KillSession\">\n"                             \
  86         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  87         "   <arg name=\"who\" type=\"s\"/>\n"                           \
  88         "   <arg name=\"signal\" type=\"s\"/>\n"                        \
  89         "  </method>\n"                                                 \
  90         "  <method name=\"KillUser\">\n"                                \
  91         "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
  92         "   <arg name=\"signal\" type=\"s\"/>\n"                        \
  93         "  </method>\n"                                                 \
  94         "  <method name=\"TerminateSession\">\n"                        \
  95         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  96         "  </method>\n"                                                 \
  97         "  <method name=\"TerminateUser\">\n"                           \
  98         "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
  99         "  </method>\n"                                                 \
 100         "  <method name=\"TerminateSeat\">\n"                           \
 101         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
 102         "  </method>\n"                                                 \
 103         "  <method name=\"SetUserLinger\">\n"                           \
 104         "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
 105         "   <arg name=\"b\" type=\"b\" direction=\"in\"/>\n"            \
 106         "   <arg name=\"interactive\" type=\"b\" direction=\"in\"/>\n"  \
 107         "  </method>\n"                                                 \
 108         "  <method name=\"AttachDevice\">\n"                            \
 109         "   <arg name=\"seat\" type=\"s\" direction=\"in\"/>\n"         \
 110         "   <arg name=\"sysfs\" type=\"s\" direction=\"in\"/>\n"        \
 111         "   <arg name=\"interactive\" type=\"b\" direction=\"in\"/>\n"  \
 112         "  </method>\n"                                                 \
 113         "  <method name=\"FlushDevices\">\n"                            \
 114         "   <arg name=\"interactive\" type=\"b\" direction=\"in\"/>\n"  \
 115         "  </method>\n"                                                 \
 116         "  <method name=\"PowerOff\">\n"                                \
 117         "   <arg name=\"interactive\" type=\"b\" direction=\"in\"/>\n"  \
 118         "  </method>\n"                                                 \
 119         "  <method name=\"Reboot\">\n"                                  \
 120         "   <arg name=\"interactive\" type=\"b\" direction=\"in\"/>\n"  \
 121         "  </method>\n"                                                 \
 122         "  <signal name=\"SessionNew\">\n"                              \
 123         "   <arg name=\"id\" type=\"s\"/>\n"                            \
 124         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 125         "  </signal>\n"                                                 \
 126         "  <signal name=\"SessionRemoved\">\n"                          \
 127         "   <arg name=\"id\" type=\"s\"/>\n"                            \
 128         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 129         "  </signal>\n"                                                 \
 130         "  <signal name=\"UserNew\">\n"                                 \
 131         "   <arg name=\"uid\" type=\"u\"/>\n"                           \
 132         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 133         "  </signal>\n"                                                 \
 134         "  <signal name=\"UserRemoved\">\n"                             \
 135         "   <arg name=\"uid\" type=\"u\"/>\n"                           \
 136         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 137         "  </signal>\n"                                                 \
 138         "  <signal name=\"SeatNew\">\n"                                 \
 139         "   <arg name=\"id\" type=\"s\"/>\n"                            \
 140         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 141         "  </signal>\n"                                                 \
 142         "  <signal name=\"SeatRemoved\">\n"                             \
 143         "   <arg name=\"id\" type=\"s\"/>\n"                            \
 144         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 145         "  </signal>\n"                                                 \
 146         "  <property name=\"ControlGroupHierarchy\" type=\"s\" access=\"read\"/>\n" \
 147         "  <property name=\"Controllers\" type=\"as\" access=\"read\"/>\n" \
 148         "  <property name=\"ResetControllers\" type=\"as\" access=\"read\"/>\n" \
 149         "  <property name=\"NAutoVTs\" type=\"u\" access=\"read\"/>\n" \
 150         "  <property name=\"KillOnlyUsers\" type=\"as\" access=\"read\"/>\n" \
 151         "  <property name=\"KillExcludeUsers\" type=\"as\" access=\"read\"/>\n" \
 152         "  <property name=\"KillUserProcesses\" type=\"b\" access=\"read\"/>\n" \
 153         "  <property name=\"IdleHint\" type=\"b\" access=\"read\"/>\n"  \
 154         "  <property name=\"IdleSinceHint\" type=\"t\" access=\"read\"/>\n" \
 155         "  <property name=\"IdleSinceHintMonotonic\" type=\"t\" access=\"read\"/>\n" \
 156         " </interface>\n"
 157
 158 #define INTROSPECTION_BEGIN                                             \
 159         DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                       \
 160         "<node>\n"                                                      \
 161         BUS_MANAGER_INTERFACE                                           \
 162         BUS_PROPERTIES_INTERFACE                                        \
 163         BUS_PEER_INTERFACE                                              \
 164         BUS_INTROSPECTABLE_INTERFACE
 165
 166 #define INTROSPECTION_END                                               \
 167         "</node>\n"
 168
 169 #define INTERFACES_LIST                              \
 170         BUS_GENERIC_INTERFACES_LIST                  \
 171         "org.freedesktop.login1.Manager\0"
 172
 173 static int bus_manager_append_idle_hint(DBusMessageIter *i, const char *property, void *data) {
 174         Manager *m = data;
 175         dbus_bool_t b;
 176
 177         assert(i);
 178         assert(property);
 179         assert(m);
 180
 181         b = manager_get_idle_hint(m, NULL) > 0;
 182         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
 183                 return -ENOMEM;
 184
 185         return 0;
 186 }
 187
 188 static int bus_manager_append_idle_hint_since(DBusMessageIter *i, const char *property, void *data) {
 189         Manager *m = data;
 190         dual_timestamp t;
 191         uint64_t u;
 192
 193         assert(i);
 194         assert(property);
 195         assert(m);
 196
 197         manager_get_idle_hint(m, &t);
 198         u = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
 199
 200         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u))
 201                 return -ENOMEM;
 202
 203         return 0;
 204 }
 205
 206 static int bus_manager_create_session(Manager *m, DBusMessage *message, DBusMessage **_reply) {
 207         Session *session = NULL;
 208         User *user = NULL;
 209         const char *type, *seat, *tty, *display, *remote_user, *remote_host, *service;
 210         uint32_t uid, leader, audit_id = 0;
 211         dbus_bool_t remote, kill_processes;
 212         char **controllers = NULL, **reset_controllers = NULL;
 213         SessionType t;
 214         Seat *s;
 215         DBusMessageIter iter;
 216         int r;
 217         char *id = NULL, *p;
 218         uint32_t vtnr = 0;
 219         int fifo_fd = -1;
 220         DBusMessage *reply = NULL;
 221         bool b;
 222
 223         assert(m);
 224         assert(message);
 225         assert(_reply);
 226
 227         if (!dbus_message_iter_init(message, &iter) ||
 228             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_UINT32)
 229                 return -EINVAL;
 230
 231         dbus_message_iter_get_basic(&iter, &uid);
 232
 233         if (!dbus_message_iter_next(&iter) ||
 234             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_UINT32)
 235                 return -EINVAL;
 236
 237         dbus_message_iter_get_basic(&iter, &leader);
 238
 239         if (leader <= 0 ||
 240             !dbus_message_iter_next(&iter) ||
 241             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 242                 return -EINVAL;
 243
 244         dbus_message_iter_get_basic(&iter, &service);
 245
 246         if (!dbus_message_iter_next(&iter) ||
 247             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 248                 return -EINVAL;
 249
 250         dbus_message_iter_get_basic(&iter, &type);
 251         t = session_type_from_string(type);
 252
 253         if (t < 0 ||
 254             !dbus_message_iter_next(&iter) ||
 255             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 256                 return -EINVAL;
 257
 258         dbus_message_iter_get_basic(&iter, &seat);
 259
 260         if (isempty(seat))
 261                 s = NULL;
 262         else {
 263                 s = hashmap_get(m->seats, seat);
 264                 if (!s)
 265                         return -ENOENT;
 266         }
 267
 268         if (!dbus_message_iter_next(&iter) ||
 269             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_UINT32)
 270                 return -EINVAL;
 271
 272         dbus_message_iter_get_basic(&iter, &vtnr);
 273
 274         if (!dbus_message_iter_next(&iter) ||
 275             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 276                 return -EINVAL;
 277
 278         dbus_message_iter_get_basic(&iter, &tty);
 279
 280         if (tty_is_vc(tty)) {
 281                 int v;
 282
 283                 if (!s)
 284                         s = m->vtconsole;
 285                 else if (s != m->vtconsole)
 286                         return -EINVAL;
 287
 288                 v = vtnr_from_tty(tty);
 289
 290                 if (v <= 0)
 291                         return v < 0 ? v : -EINVAL;
 292
 293                 if (vtnr <= 0)
 294                         vtnr = (uint32_t) v;
 295                 else if (vtnr != (uint32_t) v)
 296                         return -EINVAL;
 297
 298         } else if (!isempty(tty) && s && seat_is_vtconsole(s))
 299                 return -EINVAL;
 300
 301         if (s) {
 302                 if (seat_is_vtconsole(s)) {
 303                         if (vtnr <= 0 || vtnr > 63)
 304                                 return -EINVAL;
 305                 } else {
 306                         if (vtnr > 0)
 307                                 return -EINVAL;
 308                 }
 309         }
 310
 311         if (!dbus_message_iter_next(&iter) ||
 312             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 313                 return -EINVAL;
 314
 315         dbus_message_iter_get_basic(&iter, &display);
 316
 317         if (!dbus_message_iter_next(&iter) ||
 318             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_BOOLEAN)
 319                 return -EINVAL;
 320
 321         dbus_message_iter_get_basic(&iter, &remote);
 322
 323         if (!dbus_message_iter_next(&iter) ||
 324             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 325                 return -EINVAL;
 326
 327         dbus_message_iter_get_basic(&iter, &remote_user);
 328
 329         if (!dbus_message_iter_next(&iter) ||
 330             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 331                 return -EINVAL;
 332
 333         dbus_message_iter_get_basic(&iter, &remote_host);
 334
 335         if (!dbus_message_iter_next(&iter) ||
 336             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
 337             dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRING)
 338                 return -EINVAL;
 339
 340         r = bus_parse_strv_iter(&iter, &controllers);
 341         if (r < 0)
 342                 return -EINVAL;
 343
 344         if (strv_contains(controllers, "systemd") ||
 345             !dbus_message_iter_next(&iter) ||
 346             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
 347             dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRING) {
 348                 r = -EINVAL;
 349                 goto fail;
 350         }
 351
 352         r = bus_parse_strv_iter(&iter, &reset_controllers);
 353         if (r < 0)
 354                 goto fail;
 355
 356         if (strv_contains(reset_controllers, "systemd") ||
 357             !dbus_message_iter_next(&iter) ||
 358             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_BOOLEAN) {
 359                 r = -EINVAL;
 360                 goto fail;
 361         }
 362
 363         dbus_message_iter_get_basic(&iter, &kill_processes);
 364
 365         r = manager_add_user_by_uid(m, uid, &user);
 366         if (r < 0)
 367                 goto fail;
 368
 369         audit_session_from_pid(leader, &audit_id);
 370
 371         if (audit_id > 0) {
 372                 asprintf(&id, "%lu", (unsigned long) audit_id);
 373
 374                 if (!id) {
 375                         r = -ENOMEM;
 376                         goto fail;
 377                 }
 378
 379                 session = hashmap_get(m->sessions, id);
 380
 381                 if (session) {
 382
 383                         fifo_fd = session_create_fifo(session);
 384                         if (fifo_fd < 0) {
 385                                 r = fifo_fd;
 386                                 goto fail;
 387                         }
 388
 389                         /* Session already exists, client is probably
 390                          * something like "su" which changes uid but
 391                          * is still the same audit session */
 392
 393                         reply = dbus_message_new_method_return(message);
 394                         if (!reply) {
 395                                 r = -ENOMEM;
 396                                 goto fail;
 397                         }
 398
 399                         p = session_bus_path(session);
 400                         if (!p) {
 401                                 r = -ENOMEM;
 402                                 goto fail;
 403                         }
 404
 405                         b = dbus_message_append_args(
 406                                         reply,
 407                                         DBUS_TYPE_STRING, &session->id,
 408                                         DBUS_TYPE_OBJECT_PATH, &p,
 409                                         DBUS_TYPE_STRING, &session->user->runtime_path,
 410                                         DBUS_TYPE_UNIX_FD, &fifo_fd,
 411                                         DBUS_TYPE_INVALID);
 412                         free(p);
 413
 414                         if (!b) {
 415                                 r = -ENOMEM;
 416                                 goto fail;
 417                         }
 418
 419                         close_nointr_nofail(fifo_fd);
 420                         *_reply = reply;
 421
 422                         return 0;
 423                 }
 424
 425         } else {
 426                 do {
 427                         free(id);
 428                         asprintf(&id, "c%lu", ++m->session_counter);
 429
 430                         if (!id) {
 431                                 r = -ENOMEM;
 432                                 goto fail;
 433                         }
 434
 435                 } while (hashmap_get(m->sessions, id));
 436         }
 437
 438         r = manager_add_session(m, user, id, &session);
 439         free(id);
 440         if (r < 0)
 441                 goto fail;
 442
 443         session->leader = leader;
 444         session->audit_id = audit_id;
 445         session->type = t;
 446         session->remote = remote;
 447         session->controllers = controllers;
 448         session->reset_controllers = reset_controllers;
 449         session->kill_processes = kill_processes;
 450         session->vtnr = vtnr;
 451
 452         controllers = reset_controllers = NULL;
 453
 454         if (!isempty(tty)) {
 455                 session->tty = strdup(tty);
 456                 if (!session->tty) {
 457                         r = -ENOMEM;
 458                         goto fail;
 459                 }
 460         }
 461
 462         if (!isempty(display)) {
 463                 session->display = strdup(display);
 464                 if (!session->display) {
 465                         r = -ENOMEM;
 466                         goto fail;
 467                 }
 468         }
 469
 470         if (!isempty(remote_user)) {
 471                 session->remote_user = strdup(remote_user);
 472                 if (!session->remote_user) {
 473                         r = -ENOMEM;
 474                         goto fail;
 475                 }
 476         }
 477
 478         if (!isempty(remote_host)) {
 479                 session->remote_host = strdup(remote_host);
 480                 if (!session->remote_host) {
 481                         r = -ENOMEM;
 482                         goto fail;
 483                 }
 484         }
 485
 486         if (!isempty(service)) {
 487                 session->service = strdup(service);
 488                 if (!session->service) {
 489                         r = -ENOMEM;
 490                         goto fail;
 491                 }
 492         }
 493
 494         fifo_fd = session_create_fifo(session);
 495         if (fifo_fd < 0) {
 496                 r = fifo_fd;
 497                 goto fail;
 498         }
 499
 500         if (s) {
 501                 r = seat_attach_session(s, session);
 502                 if (r < 0)
 503                         goto fail;
 504         }
 505
 506         r = session_start(session);
 507         if (r < 0)
 508                 goto fail;
 509
 510         reply = dbus_message_new_method_return(message);
 511         if (!reply) {
 512                 r = -ENOMEM;
 513                 goto fail;
 514         }
 515
 516         p = session_bus_path(session);
 517         if (!p) {
 518                 r = -ENOMEM;
 519                 goto fail;
 520         }
 521
 522         b = dbus_message_append_args(
 523                         reply,
 524                         DBUS_TYPE_STRING, &session->id,
 525                         DBUS_TYPE_OBJECT_PATH, &p,
 526                         DBUS_TYPE_STRING, &session->user->runtime_path,
 527                         DBUS_TYPE_UNIX_FD, &fifo_fd,
 528                         DBUS_TYPE_INVALID);
 529         free(p);
 530
 531         if (!b) {
 532                 r = -ENOMEM;
 533                 goto fail;
 534         }
 535
 536         close_nointr_nofail(fifo_fd);
 537         *_reply = reply;
 538
 539         return 0;
 540
 541 fail:
 542         strv_free(controllers);
 543         strv_free(reset_controllers);
 544
 545         if (session)
 546                 session_add_to_gc_queue(session);
 547
 548         if (user)
 549                 user_add_to_gc_queue(user);
 550
 551         if (fifo_fd >= 0)
 552                 close_nointr_nofail(fifo_fd);
 553
 554         if (reply)
 555                 dbus_message_unref(reply);
 556
 557         return r;
 558 }
 559
 560 static int trigger_device(Manager *m, struct udev_device *d) {
 561         struct udev_enumerate *e;
 562         struct udev_list_entry *first, *item;
 563         int r;
 564
 565         assert(m);
 566
 567         e = udev_enumerate_new(m->udev);
 568         if (!e) {
 569                 r = -ENOMEM;
 570                 goto finish;
 571         }
 572
 573         if (d) {
 574                 if (udev_enumerate_add_match_parent(e, d) < 0) {
 575                         r = -EIO;
 576                         goto finish;
 577                 }
 578         }
 579
 580         if (udev_enumerate_scan_devices(e) < 0) {
 581                 r = -EIO;
 582                 goto finish;
 583         }
 584
 585         first = udev_enumerate_get_list_entry(e);
 586         udev_list_entry_foreach(item, first) {
 587                 char *t;
 588                 const char *p;
 589
 590                 p = udev_list_entry_get_name(item);
 591
 592                 t = strappend(p, "/uevent");
 593                 if (!t) {
 594                         r = -ENOMEM;
 595                         goto finish;
 596                 }
 597
 598                 write_one_line_file(t, "change");
 599                 free(t);
 600         }
 601
 602         r = 0;
 603
 604 finish:
 605         if (e)
 606                 udev_enumerate_unref(e);
 607
 608         return r;
 609 }
 610
 611 static int attach_device(Manager *m, const char *seat, const char *sysfs) {
 612         struct udev_device *d;
 613         char *rule = NULL, *file = NULL;
 614         const char *id_for_seat;
 615         int r;
 616
 617         assert(m);
 618         assert(seat);
 619         assert(sysfs);
 620
 621         d = udev_device_new_from_syspath(m->udev, sysfs);
 622         if (!d)
 623                 return -ENODEV;
 624
 625         if (!udev_device_has_tag(d, "seat")) {
 626                 r = -ENODEV;
 627                 goto finish;
 628         }
 629
 630         id_for_seat = udev_device_get_property_value(d, "ID_FOR_SEAT");
 631         if (!id_for_seat) {
 632                 r = -ENODEV;
 633                 goto finish;
 634         }
 635
 636         if (asprintf(&file, "/etc/udev/rules.d/72-seat-%s.rules", id_for_seat) < 0) {
 637                 r = -ENOMEM;
 638                 goto finish;
 639         }
 640
 641         if (asprintf(&rule, "TAG==\"seat\", ENV{ID_FOR_SEAT}==\"%s\", ENV{ID_SEAT}=\"%s\"", id_for_seat, seat) < 0) {
 642                 r = -ENOMEM;
 643                 goto finish;
 644         }
 645
 646         mkdir_p("/etc/udev/rules.d", 0755);
 647         r = write_one_line_file_atomic(file, rule);
 648         if (r < 0)
 649                 goto finish;
 650
 651         r = trigger_device(m, d);
 652
 653 finish:
 654         free(rule);
 655         free(file);
 656
 657         if (d)
 658                 udev_device_unref(d);
 659
 660         return r;
 661 }
 662
 663 static int flush_devices(Manager *m) {
 664         DIR *d;
 665
 666         assert(m);
 667
 668         d = opendir("/etc/udev/rules.d");
 669         if (!d) {
 670                 if (errno != ENOENT)
 671                         log_warning("Failed to open /etc/udev/rules.d: %m");
 672         } else {
 673                 struct dirent *de;
 674
 675                 while ((de = readdir(d))) {
 676
 677                         if (!dirent_is_file(de))
 678                                 continue;
 679
 680                         if (!startswith(de->d_name, "72-seat-"))
 681                                 continue;
 682
 683                         if (!endswith(de->d_name, ".rules"))
 684                                 continue;
 685
 686                         if (unlinkat(dirfd(d), de->d_name, 0) < 0)
 687                                 log_warning("Failed to unlink %s: %m", de->d_name);
 688                 }
 689
 690                 closedir(d);
 691         }
 692
 693         return trigger_device(m, NULL);
 694 }
 695
 696 static DBusHandlerResult manager_message_handler(
 697                 DBusConnection *connection,
 698                 DBusMessage *message,
 699                 void *userdata) {
 700
 701         Manager *m = userdata;
 702
 703         const BusProperty properties[] = {
 704                 { "org.freedesktop.login1.Manager", "ControlGroupHierarchy",  bus_property_append_string,   "s",  m->cgroup_path          },
 705                 { "org.freedesktop.login1.Manager", "Controllers",            bus_property_append_strv,     "as", m->controllers          },
 706                 { "org.freedesktop.login1.Manager", "ResetControllers",       bus_property_append_strv,     "as", m->reset_controllers    },
 707                 { "org.freedesktop.login1.Manager", "NAutoVTs",               bus_property_append_unsigned, "u",  &m->n_autovts           },
 708                 { "org.freedesktop.login1.Manager", "KillOnlyUsers",          bus_property_append_strv,     "as", m->kill_only_users      },
 709                 { "org.freedesktop.login1.Manager", "KillExcludeUsers",       bus_property_append_strv,     "as", m->kill_exclude_users   },
 710                 { "org.freedesktop.login1.Manager", "KillUserProcesses",      bus_property_append_bool,     "b",  &m->kill_user_processes },
 711                 { "org.freedesktop.login1.Manager", "IdleHint",               bus_manager_append_idle_hint, "b",  m                       },
 712                 { "org.freedesktop.login1.Manager", "IdleSinceHint",          bus_manager_append_idle_hint_since, "t", m                  },
 713                 { "org.freedesktop.login1.Manager", "IdleSinceHintMonotonic", bus_manager_append_idle_hint_since, "t", m                  },
 714                 { NULL, NULL, NULL, NULL, NULL }
 715         };
 716
 717         DBusError error;
 718         DBusMessage *reply = NULL;
 719         int r;
 720
 721         assert(connection);
 722         assert(message);
 723         assert(m);
 724
 725         dbus_error_init(&error);
 726
 727         if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetSession")) {
 728                 const char *name;
 729                 char *p;
 730                 Session *session;
 731                 bool b;
 732
 733                 if (!dbus_message_get_args(
 734                                     message,
 735                                     &error,
 736                                     DBUS_TYPE_STRING, &name,
 737                                     DBUS_TYPE_INVALID))
 738                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 739
 740                 session = hashmap_get(m->sessions, name);
 741                 if (!session)
 742                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 743
 744                 reply = dbus_message_new_method_return(message);
 745                 if (!reply)
 746                         goto oom;
 747
 748                 p = session_bus_path(session);
 749                 if (!p)
 750                         goto oom;
 751
 752                 b = dbus_message_append_args(
 753                                 reply,
 754                                 DBUS_TYPE_OBJECT_PATH, &p,
 755                                 DBUS_TYPE_INVALID);
 756                 free(p);
 757
 758                 if (!b)
 759                         goto oom;
 760
 761         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetUser")) {
 762                 uint32_t uid;
 763                 char *p;
 764                 User *user;
 765                 bool b;
 766
 767                 if (!dbus_message_get_args(
 768                                     message,
 769                                     &error,
 770                                     DBUS_TYPE_UINT32, &uid,
 771                                     DBUS_TYPE_INVALID))
 772                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 773
 774                 user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
 775                 if (!user)
 776                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 777
 778                 reply = dbus_message_new_method_return(message);
 779                 if (!reply)
 780                         goto oom;
 781
 782                 p = user_bus_path(user);
 783                 if (!p)
 784                         goto oom;
 785
 786                 b = dbus_message_append_args(
 787                                 reply,
 788                                 DBUS_TYPE_OBJECT_PATH, &p,
 789                                 DBUS_TYPE_INVALID);
 790                 free(p);
 791
 792                 if (!b)
 793                         goto oom;
 794
 795         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetSeat")) {
 796                 const char *name;
 797                 char *p;
 798                 Seat *seat;
 799                 bool b;
 800
 801                 if (!dbus_message_get_args(
 802                                     message,
 803                                     &error,
 804                                     DBUS_TYPE_STRING, &name,
 805                                     DBUS_TYPE_INVALID))
 806                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 807
 808                 seat = hashmap_get(m->seats, name);
 809                 if (!seat)
 810                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 811
 812                 reply = dbus_message_new_method_return(message);
 813                 if (!reply)
 814                         goto oom;
 815
 816                 p = seat_bus_path(seat);
 817                 if (!p)
 818                         goto oom;
 819
 820                 b = dbus_message_append_args(
 821                                 reply,
 822                                 DBUS_TYPE_OBJECT_PATH, &p,
 823                                 DBUS_TYPE_INVALID);
 824                 free(p);
 825
 826                 if (!b)
 827                         goto oom;
 828
 829         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListSessions")) {
 830                 char *p;
 831                 Session *session;
 832                 Iterator i;
 833                 DBusMessageIter iter, sub;
 834                 const char *empty = "";
 835
 836                 reply = dbus_message_new_method_return(message);
 837                 if (!reply)
 838                         goto oom;
 839
 840                 dbus_message_iter_init_append(reply, &iter);
 841
 842                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(susso)", &sub))
 843                         goto oom;
 844
 845                 HASHMAP_FOREACH(session, m->sessions, i) {
 846                         DBusMessageIter sub2;
 847                         uint32_t uid;
 848
 849                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 850                                 goto oom;
 851
 852                         uid = session->user->uid;
 853
 854                         p = session_bus_path(session);
 855                         if (!p)
 856                                 goto oom;
 857
 858                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &session->id) ||
 859                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT32, &uid) ||
 860                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &session->user->name) ||
 861                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, session->seat ? (const char**) &session->seat->id : &empty) ||
 862                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 863                                 free(p);
 864                                 goto oom;
 865                         }
 866
 867                         free(p);
 868
 869                         if (!dbus_message_iter_close_container(&sub, &sub2))
 870                                 goto oom;
 871                 }
 872
 873                 if (!dbus_message_iter_close_container(&iter, &sub))
 874                         goto oom;
 875
 876         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListUsers")) {
 877                 char *p;
 878                 User *user;
 879                 Iterator i;
 880                 DBusMessageIter iter, sub;
 881
 882                 reply = dbus_message_new_method_return(message);
 883                 if (!reply)
 884                         goto oom;
 885
 886                 dbus_message_iter_init_append(reply, &iter);
 887
 888                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(uso)", &sub))
 889                         goto oom;
 890
 891                 HASHMAP_FOREACH(user, m->users, i) {
 892                         DBusMessageIter sub2;
 893                         uint32_t uid;
 894
 895                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 896                                 goto oom;
 897
 898                         uid = user->uid;
 899
 900                         p = user_bus_path(user);
 901                         if (!p)
 902                                 goto oom;
 903
 904                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT32, &uid) ||
 905                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &user->name) ||
 906                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 907                                 free(p);
 908                                 goto oom;
 909                         }
 910
 911                         free(p);
 912
 913                         if (!dbus_message_iter_close_container(&sub, &sub2))
 914                                 goto oom;
 915                 }
 916
 917                 if (!dbus_message_iter_close_container(&iter, &sub))
 918                         goto oom;
 919
 920         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListSeats")) {
 921                 char *p;
 922                 Seat *seat;
 923                 Iterator i;
 924                 DBusMessageIter iter, sub;
 925
 926                 reply = dbus_message_new_method_return(message);
 927                 if (!reply)
 928                         goto oom;
 929
 930                 dbus_message_iter_init_append(reply, &iter);
 931
 932                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(so)", &sub))
 933                         goto oom;
 934
 935                 HASHMAP_FOREACH(seat, m->seats, i) {
 936                         DBusMessageIter sub2;
 937
 938                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 939                                 goto oom;
 940
 941                         p = seat_bus_path(seat);
 942                         if (!p)
 943                                 goto oom;
 944
 945                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &seat->id) ||
 946                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 947                                 free(p);
 948                                 goto oom;
 949                         }
 950
 951                         free(p);
 952
 953                         if (!dbus_message_iter_close_container(&sub, &sub2))
 954                                 goto oom;
 955                 }
 956
 957                 if (!dbus_message_iter_close_container(&iter, &sub))
 958                         goto oom;
 959
 960         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "CreateSession")) {
 961
 962                 r = bus_manager_create_session(m, message, &reply);
 963                 if (r == -ENOMEM)
 964                         goto oom;
 965
 966                 if (r < 0)
 967                         return bus_send_error_reply(connection, message, &error, r);
 968
 969         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ActivateSession")) {
 970                 const char *name;
 971                 Session *session;
 972
 973                 if (!dbus_message_get_args(
 974                                     message,
 975                                     &error,
 976                                     DBUS_TYPE_STRING, &name,
 977                                     DBUS_TYPE_INVALID))
 978                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 979
 980                 session = hashmap_get(m->sessions, name);
 981                 if (!session)
 982                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 983
 984                 r = session_activate(session);
 985                 if (r < 0)
 986                         return bus_send_error_reply(connection, message, NULL, r);
 987
 988                 reply = dbus_message_new_method_return(message);
 989                 if (!reply)
 990                         goto oom;
 991
 992         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "LockSession") ||
 993                    dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "UnlockSession")) {
 994                 const char *name;
 995                 Session *session;
 996
 997                 if (!dbus_message_get_args(
 998                                     message,
 999                                     &error,
1000                                     DBUS_TYPE_STRING, &name,
1001                                     DBUS_TYPE_INVALID))
1002                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1003
1004                 session = hashmap_get(m->sessions, name);
1005                 if (!session)
1006                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1007
1008                 if (session_send_lock(session, streq(dbus_message_get_member(message), "LockSession")) < 0)
1009                         goto oom;
1010
1011                 reply = dbus_message_new_method_return(message);
1012                 if (!reply)
1013                         goto oom;
1014
1015         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "KillSession")) {
1016                 const char *swho;
1017                 int32_t signo;
1018                 KillWho who;
1019                 const char *name;
1020                 Session *session;
1021
1022                 if (!dbus_message_get_args(
1023                                     message,
1024                                     &error,
1025                                     DBUS_TYPE_STRING, &name,
1026                                     DBUS_TYPE_STRING, &swho,
1027                                     DBUS_TYPE_INT32, &signo,
1028                                     DBUS_TYPE_INVALID))
1029                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1030
1031                 if (isempty(swho))
1032                         who = KILL_ALL;
1033                 else {
1034                         who = kill_who_from_string(swho);
1035                         if (who < 0)
1036                                 return bus_send_error_reply(connection, message, &error, -EINVAL);
1037                 }
1038
1039                 if (signo <= 0 || signo >= _NSIG)
1040                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1041
1042                 session = hashmap_get(m->sessions, name);
1043                 if (!session)
1044                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1045
1046                 r = session_kill(session, who, signo);
1047                 if (r < 0)
1048                         return bus_send_error_reply(connection, message, NULL, r);
1049
1050                 reply = dbus_message_new_method_return(message);
1051                 if (!reply)
1052                         goto oom;
1053
1054         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "KillUser")) {
1055                 uint32_t uid;
1056                 User *user;
1057                 int32_t signo;
1058
1059                 if (!dbus_message_get_args(
1060                                     message,
1061                                     &error,
1062                                     DBUS_TYPE_UINT32, &uid,
1063                                     DBUS_TYPE_INT32, &signo,
1064                                     DBUS_TYPE_INVALID))
1065                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1066
1067                 if (signo <= 0 || signo >= _NSIG)
1068                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1069
1070                 user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
1071                 if (!user)
1072                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1073
1074                 r = user_kill(user, signo);
1075                 if (r < 0)
1076                         return bus_send_error_reply(connection, message, NULL, r);
1077
1078                 reply = dbus_message_new_method_return(message);
1079                 if (!reply)
1080                         goto oom;
1081
1082         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateSession")) {
1083                 const char *name;
1084                 Session *session;
1085
1086                 if (!dbus_message_get_args(
1087                                     message,
1088                                     &error,
1089                                     DBUS_TYPE_STRING, &name,
1090                                     DBUS_TYPE_INVALID))
1091                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1092
1093                 session = hashmap_get(m->sessions, name);
1094                 if (!session)
1095                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1096
1097                 r = session_stop(session);
1098                 if (r < 0)
1099                         return bus_send_error_reply(connection, message, NULL, r);
1100
1101                 reply = dbus_message_new_method_return(message);
1102                 if (!reply)
1103                         goto oom;
1104
1105         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateUser")) {
1106                 uint32_t uid;
1107                 User *user;
1108
1109                 if (!dbus_message_get_args(
1110                                     message,
1111                                     &error,
1112                                     DBUS_TYPE_UINT32, &uid,
1113                                     DBUS_TYPE_INVALID))
1114                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1115
1116                 user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
1117                 if (!user)
1118                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1119
1120                 r = user_stop(user);
1121                 if (r < 0)
1122                         return bus_send_error_reply(connection, message, NULL, r);
1123
1124                 reply = dbus_message_new_method_return(message);
1125                 if (!reply)
1126                         goto oom;
1127
1128         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateSeat")) {
1129                 const char *name;
1130                 Seat *seat;
1131
1132                 if (!dbus_message_get_args(
1133                                     message,
1134                                     &error,
1135                                     DBUS_TYPE_STRING, &name,
1136                                     DBUS_TYPE_INVALID))
1137                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1138
1139                 seat = hashmap_get(m->seats, name);
1140                 if (!seat)
1141                         return bus_send_error_reply(connection, message, &error, -ENOENT);
1142
1143                 r = seat_stop_sessions(seat);
1144                 if (r < 0)
1145                         return bus_send_error_reply(connection, message, NULL, r);
1146
1147                 reply = dbus_message_new_method_return(message);
1148                 if (!reply)
1149                         goto oom;
1150
1151         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "SetUserLinger")) {
1152                 uint32_t uid;
1153                 struct passwd *pw;
1154                 dbus_bool_t b, interactive;
1155                 char *path;
1156
1157                 if (!dbus_message_get_args(
1158                                     message,
1159                                     &error,
1160                                     DBUS_TYPE_UINT32, &uid,
1161                                     DBUS_TYPE_BOOLEAN, &b,
1162                                     DBUS_TYPE_BOOLEAN, &interactive,
1163                                     DBUS_TYPE_INVALID))
1164                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1165
1166                 errno = 0;
1167                 pw = getpwuid(uid);
1168                 if (!pw)
1169                         return bus_send_error_reply(connection, message, NULL, errno ? -errno : -EINVAL);
1170
1171                 r = verify_polkit(connection, message, "org.freedesktop.login1.set-user-linger", interactive, &error);
1172                 if (r < 0)
1173                         return bus_send_error_reply(connection, message, &error, r);
1174
1175                 r = safe_mkdir("/var/lib/systemd/linger", 0755, 0, 0);
1176                 if (r < 0)
1177                         return bus_send_error_reply(connection, message, &error, r);
1178
1179                 path = strappend("/var/lib/systemd/linger/", pw->pw_name);
1180                 if (!path)
1181                         goto oom;
1182
1183                 if (b) {
1184                         User *u;
1185
1186                         r = touch(path);
1187                         free(path);
1188
1189                         if (r < 0)
1190                                 return bus_send_error_reply(connection, message, &error, r);
1191
1192                         if (manager_add_user_by_uid(m, uid, &u) >= 0)
1193                                 user_start(u);
1194
1195                 } else {
1196                         User *u;
1197
1198                         r = unlink(path);
1199                         free(path);
1200
1201                         if (r < 0 && errno != ENOENT)
1202                                 return bus_send_error_reply(connection, message, &error, -errno);
1203
1204                         u = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
1205                         if (u)
1206                                 user_add_to_gc_queue(u);
1207                 }
1208
1209                 reply = dbus_message_new_method_return(message);
1210                 if (!reply)
1211                         goto oom;
1212
1213         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "AttachDevice")) {
1214                 const char *sysfs, *seat;
1215                 dbus_bool_t interactive;
1216
1217                 if (!dbus_message_get_args(
1218                                     message,
1219                                     &error,
1220                                     DBUS_TYPE_STRING, &seat,
1221                                     DBUS_TYPE_STRING, &sysfs,
1222                                     DBUS_TYPE_BOOLEAN, &interactive,
1223                                     DBUS_TYPE_INVALID))
1224                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1225
1226                 if (!path_startswith(sysfs, "/sys") || !seat_name_is_valid(seat))
1227                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
1228
1229                 r = verify_polkit(connection, message, "org.freedesktop.login1.attach-device", interactive, &error);
1230                 if (r < 0)
1231                         return bus_send_error_reply(connection, message, &error, r);
1232
1233                 r = attach_device(m, seat, sysfs);
1234                 if (r < 0)
1235                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
1236
1237                 reply = dbus_message_new_method_return(message);
1238                 if (!reply)
1239                         goto oom;
1240
1241
1242         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "FlushDevices")) {
1243                 dbus_bool_t interactive;
1244
1245                 if (!dbus_message_get_args(
1246                                     message,
1247                                     &error,
1248                                     DBUS_TYPE_BOOLEAN, &interactive,
1249                                     DBUS_TYPE_INVALID))
1250                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1251
1252                 r = verify_polkit(connection, message, "org.freedesktop.login1.flush-devices", interactive, &error);
1253                 if (r < 0)
1254                         return bus_send_error_reply(connection, message, &error, r);
1255
1256                 r = flush_devices(m);
1257                 if (r < 0)
1258                         return bus_send_error_reply(connection, message, NULL, -EINVAL);
1259
1260                 reply = dbus_message_new_method_return(message);
1261                 if (!reply)
1262                         goto oom;
1263
1264         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "PowerOff") ||
1265                    dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "Reboot")) {
1266                 dbus_bool_t interactive;
1267                 bool multiple_sessions;
1268                 DBusMessage *forward, *freply;
1269                 const char *name;
1270                 const char *mode = "replace";
1271                 const char *action;
1272
1273                 if (!dbus_message_get_args(
1274                                     message,
1275                                     &error,
1276                                     DBUS_TYPE_BOOLEAN, &interactive,
1277                                     DBUS_TYPE_INVALID))
1278                         return bus_send_error_reply(connection, message, &error, -EINVAL);
1279
1280                 multiple_sessions = hashmap_size(m->sessions) > 1;
1281
1282                 if (!multiple_sessions) {
1283                         Session *s;
1284
1285                         /* Hmm, there's only one session, but let's
1286                          * make sure it actually belongs to the user
1287                          * who is asking. If not, better be safe than
1288                          * sorry. */
1289
1290                         s = hashmap_first(m->sessions);
1291                         if (s) {
1292                                 unsigned long ul;
1293
1294                                 ul = dbus_bus_get_unix_user(connection, dbus_message_get_sender(message), &error);
1295                                 if (ul == (unsigned long) -1)
1296                                         return bus_send_error_reply(connection, message, &error, -EIO);
1297
1298                                 multiple_sessions = s->user->uid != ul;
1299                         }
1300                 }
1301
1302                 if (streq(dbus_message_get_member(message), "PowerOff")) {
1303                         if (multiple_sessions)
1304                                 action = "org.freedesktop.login1.power-off-multiple-sessions";
1305                         else
1306                                 action = "org.freedesktop.login1.power-off";
1307
1308                         name = SPECIAL_POWEROFF_TARGET;
1309                 } else {
1310                         if (multiple_sessions)
1311                                 action = "org.freedesktop.login1.reboot-multiple-sessions";
1312                         else
1313                                 action = "org.freedesktop.login1.reboot";
1314
1315                         name = SPECIAL_REBOOT_TARGET;
1316                 }
1317
1318                 r = verify_polkit(connection, message, action, interactive, &error);
1319                 if (r < 0)
1320                         return bus_send_error_reply(connection, message, &error, r);
1321
1322                 forward = dbus_message_new_method_call(
1323                               "org.freedesktop.systemd1",
1324                               "/org/freedesktop/systemd1",
1325                               "org.freedesktop.systemd1.Manager",
1326                               "StartUnit");
1327                 if (!forward)
1328                         return bus_send_error_reply(connection, message, NULL, -ENOMEM);
1329
1330                 if (!dbus_message_append_args(forward,
1331                                               DBUS_TYPE_STRING, &name,
1332                                               DBUS_TYPE_STRING, &mode,
1333                                               DBUS_TYPE_INVALID)) {
1334                         dbus_message_unref(forward);
1335                         return bus_send_error_reply(connection, message, NULL, -ENOMEM);
1336                 }
1337
1338                 freply = dbus_connection_send_with_reply_and_block(connection, forward, -1, &error);
1339                 dbus_message_unref(forward);
1340
1341                 if (!freply)
1342                         return bus_send_error_reply(connection, message, &error, -EIO);
1343
1344                 dbus_message_unref(freply);
1345
1346                 reply = dbus_message_new_method_return(message);
1347                 if (!reply)
1348                         goto oom;
1349
1350         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect")) {
1351                 char *introspection = NULL;
1352                 FILE *f;
1353                 Iterator i;
1354                 Session *session;
1355                 Seat *seat;
1356                 User *user;
1357                 size_t size;
1358                 char *p;
1359
1360                 if (!(reply = dbus_message_new_method_return(message)))
1361                         goto oom;
1362
1363                 /* We roll our own introspection code here, instead of
1364                  * relying on bus_default_message_handler() because we
1365                  * need to generate our introspection string
1366                  * dynamically. */
1367
1368                 if (!(f = open_memstream(&introspection, &size)))
1369                         goto oom;
1370
1371                 fputs(INTROSPECTION_BEGIN, f);
1372
1373                 HASHMAP_FOREACH(seat, m->seats, i) {
1374                         p = bus_path_escape(seat->id);
1375
1376                         if (p) {
1377                                 fprintf(f, "<node name=\"seat/%s\"/>", p);
1378                                 free(p);
1379                         }
1380                 }
1381
1382                 HASHMAP_FOREACH(user, m->users, i)
1383                         fprintf(f, "<node name=\"user/%llu\"/>", (unsigned long long) user->uid);
1384
1385                 HASHMAP_FOREACH(session, m->sessions, i) {
1386                         p = bus_path_escape(session->id);
1387
1388                         if (p) {
1389                                 fprintf(f, "<node name=\"session/%s\"/>", p);
1390                                 free(p);
1391                         }
1392                 }
1393
1394                 fputs(INTROSPECTION_END, f);
1395
1396                 if (ferror(f)) {
1397                         fclose(f);
1398                         free(introspection);
1399                         goto oom;
1400                 }
1401
1402                 fclose(f);
1403
1404                 if (!introspection)
1405                         goto oom;
1406
1407                 if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID)) {
1408                         free(introspection);
1409                         goto oom;
1410                 }
1411
1412                 free(introspection);
1413         } else
1414                 return bus_default_message_handler(connection, message, NULL, INTERFACES_LIST, properties);
1415
1416         if (reply) {
1417                 if (!dbus_connection_send(connection, reply, NULL))
1418                         goto oom;
1419
1420                 dbus_message_unref(reply);
1421         }
1422
1423         return DBUS_HANDLER_RESULT_HANDLED;
1424
1425 oom:
1426         if (reply)
1427                 dbus_message_unref(reply);
1428
1429         dbus_error_free(&error);
1430
1431         return DBUS_HANDLER_RESULT_NEED_MEMORY;
1432 }
1433
1434 const DBusObjectPathVTable bus_manager_vtable = {
1435         .message_function = manager_message_handler
1436 };
1437
1438 DBusHandlerResult bus_message_filter(
1439                 DBusConnection *connection,
1440                 DBusMessage *message,
1441                 void *userdata) {
1442
1443         Manager *m = userdata;
1444         DBusError error;
1445
1446         assert(m);
1447         assert(connection);
1448         assert(message);
1449
1450         dbus_error_init(&error);
1451
1452         if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Agent", "Released")) {
1453                 const char *cgroup;
1454
1455                 if (!dbus_message_get_args(message, &error,
1456                                            DBUS_TYPE_STRING, &cgroup,
1457                                            DBUS_TYPE_INVALID))
1458                         log_error("Failed to parse Released message: %s", bus_error_message(&error));
1459                 else
1460                         manager_cgroup_notify_empty(m, cgroup);
1461         }
1462
1463         dbus_error_free(&error);
1464
1465         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
1466 }
1467
1468 int manager_send_changed(Manager *manager, const char *properties) {
1469         DBusMessage *m;
1470         int r = -ENOMEM;
1471
1472         assert(manager);
1473
1474         m = bus_properties_changed_new("/org/freedesktop/login1", "org.freedesktop.login1.Manager", properties);
1475         if (!m)
1476                 goto finish;
1477
1478         if (!dbus_connection_send(manager->bus, m, NULL))
1479                 goto finish;
1480
1481         r = 0;
1482
1483 finish:
1484         if (m)
1485                 dbus_message_unref(m);
1486
1487         return r;
1488 }