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
  25 #include "logind.h"
  26 #include "dbus-common.h"
  27
  28 #define BUS_MANAGER_INTERFACE                                           \
  29         " <interface name=\"org.freedesktop.login1.Manager\">\n"        \
  30         "  <method name=\"GetSession\">\n"                              \
  31         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  32         "   <arg name=\"session\" type=\"o\" direction=\"out\"/>\n"     \
  33         "  </method>\n"                                                 \
  34         "  <method name=\"GetUser\">\n"                                 \
  35         "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
  36         "   <arg name=\"user\" type=\"o\" direction=\"out\"/>\n"        \
  37         "  </method>\n"                                                 \
  38         "  <method name=\"GetSeat\">\n"                                 \
  39         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  40         "   <arg name=\"seat\" type=\"o\" direction=\"out\"/>\n"        \
  41         "  </method>\n"                                                 \
  42         "  <method name=\"ListSessions\">\n"                            \
  43         "   <arg name=\"users\" type=\"a(sussso)\" direction=\"out\"/>\n" \
  44         "  </method>\n"                                                 \
  45         "  <method name=\"ListUsers\">\n"                               \
  46         "   <arg name=\"users\" type=\"a(uso)\" direction=\"out\"/>\n"  \
  47         "  </method>\n"                                                 \
  48         "  <method name=\"ListSeats\">\n"                               \
  49         "   <arg name=\"seats\" type=\"a(so)\" direction=\"out\"/>\n"   \
  50         "  </method>\n"                                                 \
  51         "  <method name=\"CreateSession\">\n"                           \
  52         "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
  53         "   <arg name=\"leader\" type=\"u\" direction=\"in\"/>\n"       \
  54         "   <arg name=\"type\" type=\"s\" direction=\"in\"/>\n"         \
  55         "   <arg name=\"seat\" type=\"s\" direction=\"in\"/>\n"         \
  56         "   <arg name=\"tty\" type=\"s\" direction=\"in\"/>\n"          \
  57         "   <arg name=\"display\" type=\"s\" direction=\"in\"/>\n"      \
  58         "   <arg name=\"remote\" type=\"b\" direction=\"in\"/>\n"       \
  59         "   <arg name=\"remote_user\" type=\"s\" direction=\"in\"/>\n"  \
  60         "   <arg name=\"remote_host\" type=\"s\" direction=\"in\"/>\n"  \
  61         "   <arg name=\"controllers\" type=\"as\" direction=\"in\"/>\n" \
  62         "   <arg name=\"reset_controllers\" type=\"as\" direction=\"in\"/>\n" \
  63         "   <arg name=\"kill_processes\" type=\"as\" direction=\"in\"/>\n" \
  64         "   <arg name=\"id\" type=\"s\" direction=\"out\"/>\n"          \
  65         "   <arg name=\"path\" type=\"o\" direction=\"out\"/>\n"        \
  66         "   <arg name=\"fd\" type=\"h\" direction=\"out\"/>\n"          \
  67         "  </method>\n"                                                 \
  68         "  <method name=\"ActivateSession\">\n"                         \
  69         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  70         "  </method>\n"                                                 \
  71         "  <method name=\"TerminateSession\">\n"                        \
  72         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  73         "  </method>\n"                                                 \
  74         "  <method name=\"TerminateUser\">\n"                           \
  75         "   <arg name=\"uid\" type=\"u\" direction=\"in\"/>\n"          \
  76         "  </method>\n"                                                 \
  77         "  <method name=\"TerminateSeat\">\n"                           \
  78         "   <arg name=\"id\" type=\"s\" direction=\"in\"/>\n"           \
  79         "  </method>\n"                                                 \
  80         "  <signal name=\"SessionNew\">\n"                              \
  81         "   <arg name=\"id\" type=\"s\"/>\n"                            \
  82         "   <arg name=\"path\" type=\"o\"/>\n"                          \
  83         "  </signal>\n"                                                 \
  84         "  <signal name=\"SessionRemoved\">\n"                          \
  85         "   <arg name=\"id\" type=\"s\"/>\n"                            \
  86         "   <arg name=\"path\" type=\"o\"/>\n"                          \
  87         "  </signal>\n"                                                 \
  88         "  <signal name=\"UserNew\">\n"                                 \
  89         "   <arg name=\"uid\" type=\"u\"/>\n"                           \
  90         "   <arg name=\"path\" type=\"o\"/>\n"                          \
  91         "  </signal>\n"                                                 \
  92         "  <signal name=\"UserRemoved\">\n"                             \
  93         "   <arg name=\"uid\" type=\"u\"/>\n"                           \
  94         "   <arg name=\"path\" type=\"o\"/>\n"                          \
  95         "  </signal>\n"                                                 \
  96         "  <signal name=\"SeatNew\">\n"                                 \
  97         "   <arg name=\"id\" type=\"s\"/>\n"                            \
  98         "   <arg name=\"path\" type=\"o\"/>\n"                          \
  99         "  </signal>\n"                                                 \
 100         "  <signal name=\"SeatRemoved\">\n"                             \
 101         "   <arg name=\"id\" type=\"s\"/>\n"                            \
 102         "   <arg name=\"path\" type=\"o\"/>\n"                          \
 103         "  </signal>\n"                                                 \
 104         "  <property name=\"ControlGroupHierarchy\" type=\"s\" access=\"read\"/>\n" \
 105         "  <property name=\"Controllers\" type=\"as\" access=\"read\"/>\n" \
 106         "  <property name=\"ResetControllers\" type=\"as\" access=\"read\"/>\n" \
 107         "  <property name=\"NAutoVTs\" type=\"u\" access=\"read\"/>\n" \
 108         "  <property name=\"KillOnlyUsers\" type=\"as\" access=\"read\"/>\n" \
 109         "  <property name=\"KillExcludeUsers\" type=\"as\" access=\"read\"/>\n" \
 110         "  <property name=\"KillUserProcesses\" type=\"b\" access=\"read\"/>\n" \
 111         "  <property name=\"IdleHint\" type=\"b\" access=\"read\"/>\n"  \
 112         "  <property name=\"IdleSinceHint\" type=\"t\" access=\"read\"/>\n" \
 113         "  <property name=\"IdleSinceHintMonotonic\" type=\"t\" access=\"read\"/>\n" \
 114         " </interface>\n"
 115
 116 #define INTROSPECTION_BEGIN                                             \
 117         DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                       \
 118         "<node>\n"                                                      \
 119         BUS_MANAGER_INTERFACE                                           \
 120         BUS_PROPERTIES_INTERFACE                                        \
 121         BUS_PEER_INTERFACE                                              \
 122         BUS_INTROSPECTABLE_INTERFACE
 123
 124 #define INTROSPECTION_END                                               \
 125         "</node>\n"
 126
 127 #define INTERFACES_LIST                              \
 128         BUS_GENERIC_INTERFACES_LIST                  \
 129         "org.freedesktop.login1.Manager\0"
 130
 131 static int bus_manager_append_idle_hint(DBusMessageIter *i, const char *property, void *data) {
 132         Manager *m = data;
 133         bool b;
 134
 135         assert(i);
 136         assert(property);
 137         assert(m);
 138
 139         b = manager_get_idle_hint(m, NULL);
 140         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
 141                 return -ENOMEM;
 142
 143         return 0;
 144 }
 145
 146 static int bus_manager_append_idle_hint_since(DBusMessageIter *i, const char *property, void *data) {
 147         Manager *m = data;
 148         dual_timestamp t;
 149         uint64_t u;
 150
 151         assert(i);
 152         assert(property);
 153         assert(m);
 154
 155         manager_get_idle_hint(m, &t);
 156         u = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
 157
 158         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &u))
 159                 return -ENOMEM;
 160
 161         return 0;
 162 }
 163
 164 static DBusHandlerResult manager_message_handler(
 165                 DBusConnection *connection,
 166                 DBusMessage *message,
 167                 void *userdata) {
 168
 169         Manager *m = userdata;
 170
 171         const BusProperty properties[] = {
 172                 { "org.freedesktop.login1.Manager", "ControlGroupHierarchy",  bus_property_append_string,   "s",  m->cgroup_path          },
 173                 { "org.freedesktop.login1.Manager", "Controllers",            bus_property_append_strv,     "as", m->controllers          },
 174                 { "org.freedesktop.login1.Manager", "ResetControllers",       bus_property_append_strv,     "as", m->reset_controllers    },
 175                 { "org.freedesktop.login1.Manager", "NAutoVTs",               bus_property_append_unsigned, "u",  &m->n_autovts           },
 176                 { "org.freedesktop.login1.Manager", "KillOnlyUsers",          bus_property_append_strv,     "as", m->kill_only_users      },
 177                 { "org.freedesktop.login1.Manager", "KillExcludeUsers",       bus_property_append_strv,     "as", m->kill_exclude_users   },
 178                 { "org.freedesktop.login1.Manager", "KillUserProcesses",      bus_property_append_bool,     "b",  &m->kill_user_processes },
 179                 { "org.freedesktop.login1.Manager", "IdleHint",               bus_manager_append_idle_hint, "b",  m                       },
 180                 { "org.freedesktop.login1.Manager", "IdleSinceHint",          bus_manager_append_idle_hint_since, "t", m                  },
 181                 { "org.freedesktop.login1.Manager", "IdleSinceHintMonotonic", bus_manager_append_idle_hint_since, "t", m                  },
 182                 { NULL, NULL, NULL, NULL, NULL }
 183         };
 184
 185         DBusError error;
 186         DBusMessage *reply = NULL;
 187         int r;
 188
 189         assert(connection);
 190         assert(message);
 191         assert(m);
 192
 193         dbus_error_init(&error);
 194
 195         if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetSession")) {
 196                 const char *name;
 197                 char *p;
 198                 Session *session;
 199                 bool b;
 200
 201                 if (!dbus_message_get_args(
 202                                     message,
 203                                     &error,
 204                                     DBUS_TYPE_STRING, &name,
 205                                     DBUS_TYPE_INVALID))
 206                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 207
 208                 session = hashmap_get(m->sessions, name);
 209                 if (!session)
 210                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 211
 212                 reply = dbus_message_new_method_return(message);
 213                 if (!reply)
 214                         goto oom;
 215
 216                 p = session_bus_path(session);
 217                 if (!p)
 218                         goto oom;
 219
 220                 b = dbus_message_append_args(
 221                                 reply,
 222                                 DBUS_TYPE_OBJECT_PATH, &p,
 223                                 DBUS_TYPE_INVALID);
 224                 free(p);
 225
 226                 if (!b)
 227                         goto oom;
 228
 229         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetUser")) {
 230                 uint32_t uid;
 231                 char *p;
 232                 User *user;
 233                 bool b;
 234
 235                 if (!dbus_message_get_args(
 236                                     message,
 237                                     &error,
 238                                     DBUS_TYPE_UINT32, &uid,
 239                                     DBUS_TYPE_INVALID))
 240                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 241
 242                 user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
 243                 if (!user)
 244                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 245
 246                 reply = dbus_message_new_method_return(message);
 247                 if (!reply)
 248                         goto oom;
 249
 250                 p = user_bus_path(user);
 251                 if (!p)
 252                         goto oom;
 253
 254                 b = dbus_message_append_args(
 255                                 reply,
 256                                 DBUS_TYPE_OBJECT_PATH, &p,
 257                                 DBUS_TYPE_INVALID);
 258                 free(p);
 259
 260                 if (!b)
 261                         goto oom;
 262
 263         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "GetSeat")) {
 264                 const char *name;
 265                 char *p;
 266                 Seat *seat;
 267                 bool b;
 268
 269                 if (!dbus_message_get_args(
 270                                     message,
 271                                     &error,
 272                                     DBUS_TYPE_STRING, &name,
 273                                     DBUS_TYPE_INVALID))
 274                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 275
 276                 seat = hashmap_get(m->seats, name);
 277                 if (!seat)
 278                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 279
 280                 reply = dbus_message_new_method_return(message);
 281                 if (!reply)
 282                         goto oom;
 283
 284                 p = seat_bus_path(seat);
 285                 if (!p)
 286                         goto oom;
 287
 288                 b = dbus_message_append_args(
 289                                 reply,
 290                                 DBUS_TYPE_OBJECT_PATH, &p,
 291                                 DBUS_TYPE_INVALID);
 292                 free(p);
 293
 294                 if (!b)
 295                         goto oom;
 296
 297         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "ActivateSession")) {
 298                 const char *name;
 299                 Session *session;
 300
 301                 if (!dbus_message_get_args(
 302                                     message,
 303                                     &error,
 304                                     DBUS_TYPE_STRING, &name,
 305                                     DBUS_TYPE_INVALID))
 306                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 307
 308                 session = hashmap_get(m->sessions, name);
 309                 if (!session)
 310                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 311
 312                 r = session_activate(session);
 313                 if (r < 0)
 314                         return bus_send_error_reply(connection, message, NULL, r);
 315
 316                 reply = dbus_message_new_method_return(message);
 317                 if (!reply)
 318                         goto oom;
 319
 320         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateSession")) {
 321                 const char *name;
 322                 Session *session;
 323
 324                 if (!dbus_message_get_args(
 325                                     message,
 326                                     &error,
 327                                     DBUS_TYPE_STRING, &name,
 328                                     DBUS_TYPE_INVALID))
 329                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 330
 331                 session = hashmap_get(m->sessions, name);
 332                 if (!session)
 333                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 334
 335                 r = session_stop(session);
 336                 if (r < 0)
 337                         return bus_send_error_reply(connection, message, NULL, r);
 338
 339                 reply = dbus_message_new_method_return(message);
 340                 if (!reply)
 341                         goto oom;
 342
 343         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateUser")) {
 344                 uint32_t uid;
 345                 User *user;
 346
 347                 if (!dbus_message_get_args(
 348                                     message,
 349                                     &error,
 350                                     DBUS_TYPE_UINT32, &uid,
 351                                     DBUS_TYPE_INVALID))
 352                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 353
 354                 user = hashmap_get(m->users, ULONG_TO_PTR((unsigned long) uid));
 355                 if (!user)
 356                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 357
 358                 r = user_stop(user);
 359                 if (r < 0)
 360                         return bus_send_error_reply(connection, message, NULL, r);
 361
 362                 reply = dbus_message_new_method_return(message);
 363                 if (!reply)
 364                         goto oom;
 365
 366         } else if (dbus_message_is_method_call(message, "org.freedesktop.login1.Manager", "TerminateSeat")) {
 367                 const char *name;
 368                 Seat *seat;
 369
 370                 if (!dbus_message_get_args(
 371                                     message,
 372                                     &error,
 373                                     DBUS_TYPE_STRING, &name,
 374                                     DBUS_TYPE_INVALID))
 375                         return bus_send_error_reply(connection, message, &error, -EINVAL);
 376
 377                 seat = hashmap_get(m->seats, name);
 378                 if (!seat)
 379                         return bus_send_error_reply(connection, message, &error, -ENOENT);
 380
 381                 r = seat_stop_sessions(seat);
 382                 if (r < 0)
 383                         return bus_send_error_reply(connection, message, NULL, r);
 384
 385                 reply = dbus_message_new_method_return(message);
 386                 if (!reply)
 387                         goto oom;
 388
 389         } else if (dbus_message_is_method_call(message, "org.freedesktop.DBus.Introspectable", "Introspect")) {
 390                 char *introspection = NULL;
 391                 FILE *f;
 392                 Iterator i;
 393                 Session *session;
 394                 Seat *seat;
 395                 User *user;
 396                 size_t size;
 397                 char *p;
 398
 399                 if (!(reply = dbus_message_new_method_return(message)))
 400                         goto oom;
 401
 402                 /* We roll our own introspection code here, instead of
 403                  * relying on bus_default_message_handler() because we
 404                  * need to generate our introspection string
 405                  * dynamically. */
 406
 407                 if (!(f = open_memstream(&introspection, &size)))
 408                         goto oom;
 409
 410                 fputs(INTROSPECTION_BEGIN, f);
 411
 412                 HASHMAP_FOREACH(seat, m->seats, i) {
 413                         p = bus_path_escape(seat->id);
 414
 415                         if (p) {
 416                                 fprintf(f, "<node name=\"seat/%s\"/>", p);
 417                                 free(p);
 418                         }
 419                 }
 420
 421                 HASHMAP_FOREACH(user, m->users, i)
 422                         fprintf(f, "<node name=\"user/%llu\"/>", (unsigned long long) user->uid);
 423
 424                 HASHMAP_FOREACH(session, m->sessions, i) {
 425                         p = bus_path_escape(session->id);
 426
 427                         if (p) {
 428                                 fprintf(f, "<node name=\"session/%s\"/>", p);
 429                                 free(p);
 430                         }
 431                 }
 432
 433                 fputs(INTROSPECTION_END, f);
 434
 435                 if (ferror(f)) {
 436                         fclose(f);
 437                         free(introspection);
 438                         goto oom;
 439                 }
 440
 441                 fclose(f);
 442
 443                 if (!introspection)
 444                         goto oom;
 445
 446                 if (!dbus_message_append_args(reply, DBUS_TYPE_STRING, &introspection, DBUS_TYPE_INVALID)) {
 447                         free(introspection);
 448                         goto oom;
 449                 }
 450
 451                 free(introspection);
 452         } else
 453                 return bus_default_message_handler(connection, message, NULL, INTERFACES_LIST, properties);
 454
 455         if (reply) {
 456                 if (!dbus_connection_send(connection, reply, NULL))
 457                         goto oom;
 458
 459                 dbus_message_unref(reply);
 460         }
 461
 462         return DBUS_HANDLER_RESULT_HANDLED;
 463
 464 oom:
 465         if (reply)
 466                 dbus_message_unref(reply);
 467
 468         dbus_error_free(&error);
 469
 470         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 471 }
 472
 473 const DBusObjectPathVTable bus_manager_vtable = {
 474         .message_function = manager_message_handler
 475 };