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
  26 #include "logind.h"
  27 #include "dbus-common.h"
  28 #include "strv.h"
  29
  30 #define BUS_MANAGER_INTERFACE                                           \
  31         " <interface name=\"org.freedesktop.login1.Manager\">\n"        \
  32         "  <method name=\"GetSession\">\n"                              \
  33         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  34         "   <arg name=\"session\" type=\"o\" direction=\"out\"/>\n"     \
  35         "  </method>\n"                                                 \
  36         "  <method name=\"GetUser\">\n"                                 \
  37         "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
  38         "   <arg name=\"user\" type=\"o\" direction=\"out\"/>\n"        \
  39         "  </method>\n"                                                 \
  40         "  <method name=\"GetSeat\">\n"                                 \
  41         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  42         "   <arg name=\"seat\" type=\"o\" direction=\"out\"/>\n"        \
  43         "  </method>\n"                                                 \
  44         "  <method name=\"ListSessions\">\n"                            \
  45         "   <arg name=\"sessions\" type=\"a(susso)\" direction=\"out\"/>\n" \
  46         "  </method>\n"                                                 \
  47         "  <method name=\"ListUsers\">\n"                               \
  48         "   <arg name=\"users\" type=\"a(uso)\" direction=\"out\"/>\n"  \
  49         "  </method>\n"                                                 \
  50         "  <method name=\"ListSeats\">\n"                               \
  51         "   <arg name=\"seats\" type=\"a(so)\" direction=\"out\"/>\n"   \
  52         "  </method>\n"                                                 \
  53         "  <method name=\"CreateSession\">\n"                           \
  54         "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
  55         "   <arg name=\"leader\" type=\"u\" direction=\"in\"/>\n"       \
  56         "   <arg name=\"sevice\" type=\"s\" direction=\"in\"/>\n"       \
  57         "   <arg name=\"type\" type=\"s\" direction=\"in\"/>\n"         \
  58         "   <arg name=\"seat\" type=\"s\" direction=\"in\"/>\n"         \
  59         "   <arg name=\"vtnr\" type=\"u\" direction=\"in\"/>\n"         \
  60         "   <arg name=\"tty\" type=\"s\" direction=\"in\"/>\n"          \
  61         "   <arg name=\"display\" type=\"s\" direction=\"in\"/>\n"      \
  62         "   <arg name=\"remote\" type=\"b\" direction=\"in\"/>\n"       \
  63         "   <arg name=\"remote_user\" type=\"s\" direction=\"in\"/>\n"  \
  64         "   <arg name=\"remote_host\" type=\"s\" direction=\"in\"/>\n"  \
  65         "   <arg name=\"controllers\" type=\"as\" direction=\"in\"/>\n" \
  66         "   <arg name=\"reset_controllers\" type=\"as\" direction=\"in\"/>\n" \
  67         "   <arg name=\"kill_processes\" type=\"b\" direction=\"in\"/>\n" \
  68         "   <arg name=\"id\" type=\"s\" direction=\"out\"/>\n"          \
  69         "   <arg name=\"path\" type=\"o\" direction=\"out\"/>\n"        \
  70         "   <arg name=\"runtime_path\" type=\"o\" direction=\"out\"/>\n" \
  71         "   <arg name=\"fd\" type=\"h\" direction=\"out\"/>\n"          \
  72         "  </method>\n"                                                 \
  73         "  <method name=\"ActivateSession\">\n"                         \
  74         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  75         "  </method>\n"                                                 \
  76         "  <method name=\"TerminateSession\">\n"                        \
  77         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  78         "  </method>\n"                                                 \
  79         "  <method name=\"TerminateUser\">\n"                           \
  80         "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
  81         "  </method>\n"                                                 \
  82         "  <method name=\"TerminateSeat\">\n"                           \
  83         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  84         "  </method>\n"                                                 \
  85         "  <signal name=\"SessionNew\">\n"                              \
  86         "   <arg name=\"id\" type=\"s\"/>\n"                            \
  87         "   <arg name=\"path\" type=\"o\"/>\n"                          \
  88         "  </signal>\n"                                                 \
  89         "  <signal name=\"SessionRemoved\">\n"                          \
  90         "   <arg name=\"id\" type=\"s\"/>\n"                            \
  91         "   <arg name=\"path\" type=\"o\"/>\n"                          \
  92         "  </signal>\n"                                                 \
  93         "  <signal name=\"UserNew\">\n"                                 \
  94         "   <arg name=\"uid\" type=\"u\"/>\n"                           \
  95         "   <arg name=\"path\" type=\"o\"/>\n"                          \
  96         "  </signal>\n"                                                 \
  97         "  <signal name=\"UserRemoved\">\n"                             \
  98         "   <arg name=\"uid\" type=\"u\"/>\n"                           \
  99         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 100         "  </signal>\n"                                                 \
 101         "  <signal name=\"SeatNew\">\n"                                 \
 102         "   <arg name=\"id\" type=\"s\"/>\n"                            \
 103         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 104         "  </signal>\n"                                                 \
 105         "  <signal name=\"SeatRemoved\">\n"                             \
 106         "   <arg name=\"id\" type=\"s\"/>\n"                            \
 107         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 108         "  </signal>\n"                                                 \
 109         "  <property name=\"ControlGroupHierarchy\" type=\"s\" access=\"read\"/>\n" \
 110         "  <property name=\"Controllers\" type=\"as\" access=\"read\"/>\n" \
 111         "  <property name=\"ResetControllers\" type=\"as\" access=\"read\"/>\n" \
 112         "  <property name=\"NAutoVTs\" type=\"u\" access=\"read\"/>\n" \
 113         "  <property name=\"KillOnlyUsers\" type=\"as\" access=\"read\"/>\n" \
 114         "  <property name=\"KillExcludeUsers\" type=\"as\" access=\"read\"/>\n" \
 115         "  <property name=\"KillUserProcesses\" type=\"b\" access=\"read\"/>\n" \
 116         "  <property name=\"IdleHint\" type=\"b\" access=\"read\"/>\n"  \
 117         "  <property name=\"IdleSinceHint\" type=\"t\" access=\"read\"/>\n" \
 118         "  <property name=\"IdleSinceHintMonotonic\" type=\"t\" access=\"read\"/>\n" \
 119         " </interface>\n"
 120
 121 #define INTROSPECTION_BEGIN                                             \
 122         DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                       \
 123         "<node>\n"                                                      \
 124         BUS_MANAGER_INTERFACE                                           \
 125         BUS_PROPERTIES_INTERFACE                                        \
 126         BUS_PEER_INTERFACE                                              \
 127         BUS_INTROSPECTABLE_INTERFACE
 128
 129 #define INTROSPECTION_END                                               \
 130         "</node>\n"
 131
 132 #define INTERFACES_LIST                              \
 133         BUS_GENERIC_INTERFACES_LIST                  \
 134         "org.freedesktop.login1.Manager\0"
 135
 136 static int bus_manager_append_idle_hint(DBusMessageIter *i, const char *property, void *data) {
 137         Manager *m = data;
 138         dbus_bool_t b;
 139
 140         assert(i);
 141         assert(property);
 142         assert(m);
 143
 144         b = manager_get_idle_hint(m, NULL) > 0;
 145         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
 146                 return -ENOMEM;
 147
 148         return 0;
 149 }
 150
 151 static int bus_manager_append_idle_hint_since(DBusMessageIter *i, const char *property, void *data) {
 152         Manager *m = data;
 153         dual_timestamp t;
 154         uint64_t u;
 155
 156         assert(i);
 157         assert(property);
 158         assert(m);
 159
 160         manager_get_idle_hint(m, &t);
 161         u = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
 162
 163         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u))
 164                 return -ENOMEM;
 165
 166         return 0;
 167 }
 168
 169 static int bus_manager_create_session(Manager *m, DBusMessage *message, DBusMessage **_reply) {
 170         Session *session = NULL;
 171         User *user = NULL;
 172         const char *type, *seat, *tty, *display, *remote_user, *remote_host, *service;
 173         uint32_t uid, leader, audit_id = 0;
 174         dbus_bool_t remote, kill_processes;
 175         char **controllers = NULL, **reset_controllers = NULL;
 176         SessionType t;
 177         Seat *s;
 178         DBusMessageIter iter;
 179         int r;
 180         char *id = NULL, *p;
 181         uint32_t vtnr = 0;
 182         int pipe_fds[2] = { -1, -1 };
 183         DBusMessage *reply = NULL;
 184         bool b;
 185
 186         assert(m);
 187         assert(message);
 188         assert(_reply);
 189
 190         if (!dbus_message_iter_init(message, &iter) ||
 191             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_UINT32)
 192                 return -EINVAL;
 193
 194         dbus_message_iter_get_basic(&iter, &uid);
 195
 196         if (!dbus_message_iter_next(&iter) ||
 197             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_UINT32)
 198                 return -EINVAL;
 199
 200         dbus_message_iter_get_basic(&iter, &leader);
 201
 202         if (leader <= 0 ||
 203             !dbus_message_iter_next(&iter) ||
 204             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 205                 return -EINVAL;
 206
 207         dbus_message_iter_get_basic(&iter, &service);
 208
 209         if (!dbus_message_iter_next(&iter) ||
 210             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 211                 return -EINVAL;
 212
 213         dbus_message_iter_get_basic(&iter, &type);
 214         t = session_type_from_string(type);
 215
 216         if (t < 0 ||
 217             !dbus_message_iter_next(&iter) ||
 218             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 219                 return -EINVAL;
 220
 221         dbus_message_iter_get_basic(&iter, &seat);
 222
 223         if (isempty(seat))
 224                 s = NULL;
 225         else {
 226                 s = hashmap_get(m->seats, seat);
 227                 if (!s)
 228                         return -ENOENT;
 229         }
 230
 231         if (!dbus_message_iter_next(&iter) ||
 232             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_UINT32)
 233                 return -EINVAL;
 234
 235         dbus_message_iter_get_basic(&iter, &vtnr);
 236
 237         if (!dbus_message_iter_next(&iter) ||
 238             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 239                 return -EINVAL;
 240
 241         dbus_message_iter_get_basic(&iter, &tty);
 242
 243         if (tty_is_vc(tty)) {
 244                 int v;
 245
 246                 if (!s)
 247                         s = m->vtconsole;
 248                 else if (s != m->vtconsole)
 249                         return -EINVAL;
 250
 251                 v = vtnr_from_tty(tty);
 252
 253                 if (v <= 0)
 254                         return v < 0 ? v : -EINVAL;
 255
 256                 if (vtnr <= 0)
 257                         vtnr = (uint32_t) v;
 258                 else if (vtnr != (uint32_t) v)
 259                         return -EINVAL;
 260
 261         } else if (!isempty(tty) && seat_is_vtconsole(s))
 262                 return -EINVAL;
 263
 264         if (s) {
 265                 if (seat_is_vtconsole(s)) {
 266                         if (vtnr <= 0 || vtnr > 63)
 267                                 return -EINVAL;
 268                 } else {
 269                         if (vtnr > 0)
 270                                 return -EINVAL;
 271                 }
 272         }
 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, &display);
 279
 280         if (!dbus_message_iter_next(&iter) ||
 281             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_BOOLEAN)
 282                 return -EINVAL;
 283
 284         dbus_message_iter_get_basic(&iter, &remote);
 285
 286         if (!dbus_message_iter_next(&iter) ||
 287             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 288                 return -EINVAL;
 289
 290         dbus_message_iter_get_basic(&iter, &remote_user);
 291
 292         if (!dbus_message_iter_next(&iter) ||
 293             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING)
 294                 return -EINVAL;
 295
 296         dbus_message_iter_get_basic(&iter, &remote_host);
 297
 298         if (!dbus_message_iter_next(&iter) ||
 299             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
 300             dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRING)
 301                 return -EINVAL;
 302
 303         r = bus_parse_strv_iter(&iter, &controllers);
 304         if (r < 0)
 305                 return -EINVAL;
 306
 307         if (!dbus_message_iter_next(&iter) ||
 308             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
 309             dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRING) {
 310                 r = -EINVAL;
 311                 goto fail;
 312         }
 313
 314         r = bus_parse_strv_iter(&iter, &reset_controllers);
 315         if (r < 0)
 316                 goto fail;
 317
 318         if (!dbus_message_iter_next(&iter) ||
 319             dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_BOOLEAN) {
 320                 r = -EINVAL;
 321                 goto fail;
 322         }
 323
 324         dbus_message_iter_get_basic(&iter, &kill_processes);
 325
 326         r = manager_add_user_by_uid(m, uid, &user);
 327         if (r < 0)
 328                 goto fail;
 329
 330         audit_session_from_pid(leader, &audit_id);
 331
 332         if (audit_id > 0) {
 333                 asprintf(&id, "%lu", (unsigned long) audit_id);
 334
 335                 if (!id) {
 336                         r = -ENOMEM;
 337                         goto fail;
 338                 }
 339
 340                 session = hashmap_get(m->sessions, id);
 341
 342                 if (session) {
 343
 344                         /* Session already exists, client is probably
 345                          * something like "su" which changes uid but
 346                          * is still the same audit session */
 347
 348                         reply = dbus_message_new_method_return(message);
 349                         if (!reply) {
 350                                 r = -ENOMEM;
 351                                 goto fail;
 352                         }
 353
 354                         /* Create a throw-away fd */
 355                         if (pipe(pipe_fds) < 0) {
 356                                 r = -errno;
 357                                 goto fail;
 358                         }
 359
 360                         close_nointr_nofail(pipe_fds[0]);
 361                         pipe_fds[0] = -1;
 362
 363                         p = session_bus_path(session);
 364                         if (!p) {
 365                                 r = -ENOMEM;
 366                                 goto fail;
 367                         }
 368
 369                         b = dbus_message_append_args(
 370                                         reply,
 371                                         DBUS_TYPE_STRING, &session->id,
 372                                         DBUS_TYPE_OBJECT_PATH, &p,
 373                                         DBUS_TYPE_STRING, &session->user->runtime_path,
 374                                         DBUS_TYPE_UNIX_FD, &pipe_fds[1],
 375                                         DBUS_TYPE_INVALID);
 376                         free(p);
 377
 378                         if (!b) {
 379                                 r = -ENOMEM;
 380                                 goto fail;
 381                         }
 382
 383                         close_nointr_nofail(pipe_fds[1]);
 384                         *_reply = reply;
 385
 386                         return 0;
 387                 }
 388
 389         } else {
 390                 do {
 391                         free(id);
 392                         asprintf(&id, "c%lu", ++m->session_counter);
 393
 394                         if (!id) {
 395                                 r = -ENOMEM;
 396                                 goto fail;
 397                         }
 398
 399                 } while (hashmap_get(m->sessions, id));
 400         }
 401
 402         r = manager_add_session(m, user, id, &session);
 403         free(id);
 404         if (r < 0)
 405                 goto fail;
 406
 407         session->leader = leader;
 408         session->audit_id = audit_id;
 409         session->type = t;
 410         session->remote = remote;
 411         session->controllers = controllers;
 412         session->reset_controllers = reset_controllers;
 413         session->kill_processes = kill_processes;
 414         session->vtnr = vtnr;
 415
 416         controllers = reset_controllers = NULL;
 417
 418         if (!isempty(tty)) {
 419                 session->tty = strdup(tty);
 420                 if (!session->tty) {
 421                         r = -ENOMEM;
 422                         goto fail;
 423                 }
 424         }
 425
 426         if (!isempty(display)) {
 427                 session->display = strdup(display);
 428                 if (!session->display) {
 429                         r = -ENOMEM;
 430                         goto fail;
 431                 }
 432         }
 433
 434         if (!isempty(remote_user)) {
 435                 session->remote_user = strdup(remote_user);
 436                 if (!session->remote_user) {
 437                         r = -ENOMEM;
 438                         goto fail;
 439                 }
 440         }
 441
 442         if (!isempty(remote_host)) {
 443                 session->remote_host = strdup(remote_host);
 444                 if (!session->remote_host) {
 445                         r = -ENOMEM;
 446                         goto fail;
 447                 }
 448         }
 449
 450         if (!isempty(service)) {
 451                 session->service = strdup(service);
 452                 if (!session->service) {
 453                         r = -ENOMEM;
 454                         goto fail;
 455                 }
 456         }
 457
 458         if (pipe(pipe_fds) < 0) {
 459                 r = -errno;
 460                 goto fail;
 461         }
 462
 463         r = session_set_pipe_fd(session, pipe_fds[0]);
 464         if (r < 0)
 465                 goto fail;
 466         pipe_fds[0] = -1;
 467
 468         if (s) {
 469                 r = seat_attach_session(s, session);
 470                 if (r < 0)
 471                         goto fail;
 472         }
 473
 474         r = session_start(session);
 475         if (r < 0)
 476                 goto fail;
 477
 478         reply = dbus_message_new_method_return(message);
 479         if (!reply) {
 480                 r = -ENOMEM;
 481                 goto fail;
 482         }
 483
 484         p = session_bus_path(session);
 485         if (!p) {
 486                 r = -ENOMEM;
 487                 goto fail;
 488         }
 489
 490         b = dbus_message_append_args(
 491                         reply,
 492                         DBUS_TYPE_STRING, &session->id,
 493                         DBUS_TYPE_OBJECT_PATH, &p,
 494                         DBUS_TYPE_STRING, &session->user->runtime_path,
 495                         DBUS_TYPE_UNIX_FD, &pipe_fds[1],
 496                         DBUS_TYPE_INVALID);
 497         free(p);
 498
 499         if (!b) {
 500                 r = -ENOMEM;
 501                 goto fail;
 502         }
 503
 504         close_nointr_nofail(pipe_fds[1]);
 505         *_reply = reply;
 506
 507         return 0;
 508
 509 fail:
 510         strv_free(controllers);
 511         strv_free(reset_controllers);
 512
 513         if (session)
 514                 session_add_to_gc_queue(session);
 515
 516         if (user)
 517                 user_add_to_gc_queue(user);
 518
 519         close_pipe(pipe_fds);
 520
 521         if (reply)
 522                 dbus_message_unref(reply);
 523
 524         return r;
 525 }
 526
 527 static DBusHandlerResult manager_message_handler(
 528                 DBusConnection *connection,
 529                 DBusMessage *message,
 530                 void *userdata) {
 531
 532         Manager *m = userdata;
 533
 534         const BusProperty properties[] = {
 535                 { "org.freedesktop.login1.Manager", "ControlGroupHierarchy",  bus_property_append_string,   "s",  m->cgroup_path          },
 536                 { "org.freedesktop.login1.Manager", "Controllers",            bus_property_append_strv,     "as", m->controllers          },
 537                 { "org.freedesktop.login1.Manager", "NAutoVTs",               bus_property_append_unsigned, "u",  &m->n_autovts           },
 538                 { "org.freedesktop.login1.Manager", "KillOnlyUsers",          bus_property_append_strv,     "as", m->kill_only_users      },
 539                 { "org.freedesktop.login1.Manager", "KillExcludeUsers",       bus_property_append_strv,     "as", m->kill_exclude_users   },
 540                 { "org.freedesktop.login1.Manager", "KillUserProcesses",      bus_property_append_bool,     "b",  &m->kill_user_processes },
 541                 { "org.freedesktop.login1.Manager", "IdleHint",               bus_manager_append_idle_hint, "b",  m                       },
 542                 { "org.freedesktop.login1.Manager", "IdleSinceHint",          bus_manager_append_idle_hint_since, "t", m                  },
 543                 { "org.freedesktop.login1.Manager", "IdleSinceHintMonotonic", bus_manager_append_idle_hint_since, "t", m                  },
 544                 { NULL, NULL, NULL, NULL, NULL }
 545         };
 546
 547         DBusError error;
 548         DBusMessage *reply = NULL;
 549         int r;
 550
 551         assert(connection);
 552         assert(message);
 553         assert(m);
 554
 555         dbus_error_init(&error);
 556
 557         if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetSession")) {
 558                 const char *name;
 559                 char *p;
 560                 Session *session;
 561                 bool b;
 562
 563                 if (!dbus_message_get_args(
 564                                     message,
 565                                     &error,
 566                                     DBUS_TYPE_STRING, &name,
 567                                     DBUS_TYPE_INVALID))
 568                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 569
 570                 session = hashmap_get(m->sessions, name);
 571                 if (!session)
 572                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 573
 574                 reply = dbus_message_new_method_return(message);
 575                 if (!reply)
 576                         goto oom;
 577
 578                 p = session_bus_path(session);
 579                 if (!p)
 580                         goto oom;
 581
 582                 b = dbus_message_append_args(
 583                                 reply,
 584                                 DBUS_TYPE_OBJECT_PATH, &p,
 585                                 DBUS_TYPE_INVALID);
 586                 free(p);
 587
 588                 if (!b)
 589                         goto oom;
 590
 591         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetUser")) {
 592                 uint32_t uid;
 593                 char *p;
 594                 User *user;
 595                 bool b;
 596
 597                 if (!dbus_message_get_args(
 598                                     message,
 599                                     &error,
 600                                     DBUS_TYPE_UINT32, &uid,
 601                                     DBUS_TYPE_INVALID))
 602                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 603
 604                 user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
 605                 if (!user)
 606                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 607
 608                 reply = dbus_message_new_method_return(message);
 609                 if (!reply)
 610                         goto oom;
 611
 612                 p = user_bus_path(user);
 613                 if (!p)
 614                         goto oom;
 615
 616                 b = dbus_message_append_args(
 617                                 reply,
 618                                 DBUS_TYPE_OBJECT_PATH, &p,
 619                                 DBUS_TYPE_INVALID);
 620                 free(p);
 621
 622                 if (!b)
 623                         goto oom;
 624
 625         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetSeat")) {
 626                 const char *name;
 627                 char *p;
 628                 Seat *seat;
 629                 bool b;
 630
 631                 if (!dbus_message_get_args(
 632                                     message,
 633                                     &error,
 634                                     DBUS_TYPE_STRING, &name,
 635                                     DBUS_TYPE_INVALID))
 636                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 637
 638                 seat = hashmap_get(m->seats, name);
 639                 if (!seat)
 640                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 641
 642                 reply = dbus_message_new_method_return(message);
 643                 if (!reply)
 644                         goto oom;
 645
 646                 p = seat_bus_path(seat);
 647                 if (!p)
 648                         goto oom;
 649
 650                 b = dbus_message_append_args(
 651                                 reply,
 652                                 DBUS_TYPE_OBJECT_PATH, &p,
 653                                 DBUS_TYPE_INVALID);
 654                 free(p);
 655
 656                 if (!b)
 657                         goto oom;
 658
 659         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListSessions")) {
 660                 char *p;
 661                 Session *session;
 662                 Iterator i;
 663                 DBusMessageIter iter, sub;
 664                 const char *empty = "";
 665
 666                 reply = dbus_message_new_method_return(message);
 667                 if (!reply)
 668                         goto oom;
 669
 670                 dbus_message_iter_init_append(reply, &iter);
 671
 672                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(susso)", &sub))
 673                         goto oom;
 674
 675                 HASHMAP_FOREACH(session, m->sessions, i) {
 676                         DBusMessageIter sub2;
 677                         uint32_t uid;
 678
 679                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 680                                 goto oom;
 681
 682                         uid = session->user->uid;
 683
 684                         p = session_bus_path(session);
 685                         if (!p)
 686                                 goto oom;
 687
 688                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &session->id) ||
 689                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT32, &uid) ||
 690                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &session->user->name) ||
 691                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, session->seat ? (const char**) &session->seat->id : &empty) ||
 692                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 693                                 free(p);
 694                                 goto oom;
 695                         }
 696
 697                         free(p);
 698
 699                         if (!dbus_message_iter_close_container(&sub, &sub2))
 700                                 goto oom;
 701                 }
 702
 703                 if (!dbus_message_iter_close_container(&iter, &sub))
 704                         goto oom;
 705
 706         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListUsers")) {
 707                 char *p;
 708                 User *user;
 709                 Iterator i;
 710                 DBusMessageIter iter, sub;
 711
 712                 reply = dbus_message_new_method_return(message);
 713                 if (!reply)
 714                         goto oom;
 715
 716                 dbus_message_iter_init_append(reply, &iter);
 717
 718                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(uso)", &sub))
 719                         goto oom;
 720
 721                 HASHMAP_FOREACH(user, m->users, i) {
 722                         DBusMessageIter sub2;
 723                         uint32_t uid;
 724
 725                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 726                                 goto oom;
 727
 728                         uid = user->uid;
 729
 730                         p = user_bus_path(user);
 731                         if (!p)
 732                                 goto oom;
 733
 734                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_UINT32, &uid) ||
 735                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &user->name) ||
 736                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 737                                 free(p);
 738                                 goto oom;
 739                         }
 740
 741                         free(p);
 742
 743                         if (!dbus_message_iter_close_container(&sub, &sub2))
 744                                 goto oom;
 745                 }
 746
 747                 if (!dbus_message_iter_close_container(&iter, &sub))
 748                         goto oom;
 749
 750         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ListSeats")) {
 751                 char *p;
 752                 Seat *seat;
 753                 Iterator i;
 754                 DBusMessageIter iter, sub;
 755
 756                 reply = dbus_message_new_method_return(message);
 757                 if (!reply)
 758                         goto oom;
 759
 760                 dbus_message_iter_init_append(reply, &iter);
 761
 762                 if (!dbus_message_iter_open_container(&iter, DBUS_TYPE_ARRAY, "(so)", &sub))
 763                         goto oom;
 764
 765                 HASHMAP_FOREACH(seat, m->seats, i) {
 766                         DBusMessageIter sub2;
 767
 768                         if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 769                                 goto oom;
 770
 771                         p = seat_bus_path(seat);
 772                         if (!p)
 773                                 goto oom;
 774
 775                         if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &seat->id) ||
 776                             !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 777                                 free(p);
 778                                 goto oom;
 779                         }
 780
 781                         free(p);
 782
 783                         if (!dbus_message_iter_close_container(&sub, &sub2))
 784                                 goto oom;
 785                 }
 786
 787                 if (!dbus_message_iter_close_container(&iter, &sub))
 788                         goto oom;
 789
 790         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "CreateSession")) {
 791
 792                 r = bus_manager_create_session(m, message, &reply);
 793                 if (r == -ENOMEM)
 794                         goto oom;
 795
 796                 if (r < 0)
 797                         return bus_send_error_reply(connection, message, &error, r);
 798
 799         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ActivateSession")) {
 800                 const char *name;
 801                 Session *session;
 802
 803                 if (!dbus_message_get_args(
 804                                     message,
 805                                     &error,
 806                                     DBUS_TYPE_STRING, &name,
 807                                     DBUS_TYPE_INVALID))
 808                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 809
 810                 session = hashmap_get(m->sessions, name);
 811                 if (!session)
 812                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 813
 814                 r = session_activate(session);
 815                 if (r < 0)
 816                         return bus_send_error_reply(connection, message, NULL, r);
 817
 818                 reply = dbus_message_new_method_return(message);
 819                 if (!reply)
 820                         goto oom;
 821
 822         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateSession")) {
 823                 const char *name;
 824                 Session *session;
 825
 826                 if (!dbus_message_get_args(
 827                                     message,
 828                                     &error,
 829                                     DBUS_TYPE_STRING, &name,
 830                                     DBUS_TYPE_INVALID))
 831                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 832
 833                 session = hashmap_get(m->sessions, name);
 834                 if (!session)
 835                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 836
 837                 r = session_stop(session);
 838                 if (r < 0)
 839                         return bus_send_error_reply(connection, message, NULL, r);
 840
 841                 reply = dbus_message_new_method_return(message);
 842                 if (!reply)
 843                         goto oom;
 844
 845         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateUser")) {
 846                 uint32_t uid;
 847                 User *user;
 848
 849                 if (!dbus_message_get_args(
 850                                     message,
 851                                     &error,
 852                                     DBUS_TYPE_UINT32, &uid,
 853                                     DBUS_TYPE_INVALID))
 854                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 855
 856                 user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
 857                 if (!user)
 858                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 859
 860                 r = user_stop(user);
 861                 if (r < 0)
 862                         return bus_send_error_reply(connection, message, NULL, r);
 863
 864                 reply = dbus_message_new_method_return(message);
 865                 if (!reply)
 866                         goto oom;
 867
 868         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateSeat")) {
 869                 const char *name;
 870                 Seat *seat;
 871
 872                 if (!dbus_message_get_args(
 873                                     message,
 874                                     &error,
 875                                     DBUS_TYPE_STRING, &name,
 876                                     DBUS_TYPE_INVALID))
 877                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 878
 879                 seat = hashmap_get(m->seats, name);
 880                 if (!seat)
 881                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 882
 883                 r = seat_stop_sessions(seat);
 884                 if (r < 0)
 885                         return bus_send_error_reply(connection, message, NULL, r);
 886
 887                 reply = dbus_message_new_method_return(message);
 888                 if (!reply)
 889                         goto oom;
 890
 891         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect")) {
 892                 char *introspection = NULL;
 893                 FILE *f;
 894                 Iterator i;
 895                 Session *session;
 896                 Seat *seat;
 897                 User *user;
 898                 size_t size;
 899                 char *p;
 900
 901                 if (!(reply = dbus_message_new_method_return(message)))
 902                         goto oom;
 903
 904                 /* We roll our own introspection code here, instead of
 905                  * relying on bus_default_message_handler() because we
 906                  * need to generate our introspection string
 907                  * dynamically. */
 908
 909                 if (!(f = open_memstream(&introspection, &size)))
 910                         goto oom;
 911
 912                 fputs(INTROSPECTION_BEGIN, f);
 913
 914                 HASHMAP_FOREACH(seat, m->seats, i) {
 915                         p = bus_path_escape(seat->id);
 916
 917                         if (p) {
 918                                 fprintf(f, "<node name=\"seat/%s\"/>", p);
 919                                 free(p);
 920                         }
 921                 }
 922
 923                 HASHMAP_FOREACH(user, m->users, i)
 924                         fprintf(f, "<node name=\"user/%llu\"/>", (unsigned long long) user->uid);
 925
 926                 HASHMAP_FOREACH(session, m->sessions, i) {
 927                         p = bus_path_escape(session->id);
 928
 929                         if (p) {
 930                                 fprintf(f, "<node name=\"session/%s\"/>", p);
 931                                 free(p);
 932                         }
 933                 }
 934
 935                 fputs(INTROSPECTION_END, f);
 936
 937                 if (ferror(f)) {
 938                         fclose(f);
 939                         free(introspection);
 940                         goto oom;
 941                 }
 942
 943                 fclose(f);
 944
 945                 if (!introspection)
 946                         goto oom;
 947
 948                 if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID)) {
 949                         free(introspection);
 950                         goto oom;
 951                 }
 952
 953                 free(introspection);
 954         } else
 955                 return bus_default_message_handler(connection, message, NULL, INTERFACES_LIST, properties);
 956
 957         if (reply) {
 958                 if (!dbus_connection_send(connection, reply, NULL))
 959                         goto oom;
 960
 961                 dbus_message_unref(reply);
 962         }
 963
 964         return DBUS_HANDLER_RESULT_HANDLED;
 965
 966 oom:
 967         if (reply)
 968                 dbus_message_unref(reply);
 969
 970         dbus_error_free(&error);
 971
 972         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 973 }
 974
 975 const DBusObjectPathVTable bus_manager_vtable = {
 976         .message_function = manager_message_handler
 977 };
 978
 979 DBusHandlerResult bus_message_filter(
 980                 DBusConnection *connection,
 981                 DBusMessage *message,
 982                 void *userdata) {
 983
 984         Manager *m = userdata;
 985         DBusError error;
 986
 987         assert(m);
 988         assert(connection);
 989         assert(message);
 990
 991         dbus_error_init(&error);
 992
 993         if (dbus_message_is_signal(message, "org.freedesktop.systemd1.Agent", "Released")) {
 994                 const char *cgroup;
 995
 996                 if (!dbus_message_get_args(message, &error,
 997                                            DBUS_TYPE_STRING, &cgroup,
 998                                            DBUS_TYPE_INVALID))
 999                         log_error("Failed to parse Released message: %s", bus_error_message(&error));
1000                 else
1001                         manager_cgroup_notify_empty(m, cgroup);
1002         }
1003
1004         dbus_error_free(&error);
1005
1006         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
1007 }
1008
1009 int manager_send_changed(Manager *manager, const char *properties) {
1010         DBusMessage *m;
1011         int r = -ENOMEM;
1012
1013         assert(manager);
1014
1015         m = bus_properties_changed_new("/org/freedesktop/login1", "org.freedesktop.login1.Manager", properties);
1016         if (!m)
1017                 goto finish;
1018
1019         if (!dbus_connection_send(manager->bus, m, NULL))
1020                 goto finish;
1021
1022         r = 0;
1023
1024 finish:
1025         if (m)
1026                 dbus_message_unref(m);
1027
1028         return r;
1029 }