src/logind-user-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 "logind-user.h"
  27 #include "dbus-common.h"
  28
  29 #define BUS_USER_INTERFACE \
  30         " <interface name=\"org.freedesktop.login1.User\">\n"           \
  31         "  <method name=\"Terminate\"/>\n"                              \
  32         "  <property name=\"UID\" type=\"u\" access=\"read\"/>\n"       \
  33         "  <property name=\"GID\" type=\"u\" access=\"read\"/>\n"       \
  34         "  <property name=\"Name\" type=\"s\" access=\"read\"/>\n"      \
  35         "  <property name=\"Timestamp\" type=\"t\" access=\"read\"/>\n" \
  36         "  <property name=\"TimestampMonotonic\" type=\"t\" access=\"read\"/>\n" \
  37         "  <property name=\"RuntimePath\" type=\"s\" access=\"read\"/>\n" \
  38         "  <property name=\"ControlGroupPath\" type=\"s\" access=\"read\"/>\n" \
  39         "  <property name=\"Service\" type=\"s\" access=\"read\"/>\n"   \
  40         "  <property name=\"Display\" type=\"(so)\" access=\"read\"/>\n" \
  41         "  <property name=\"State\" type=\"s\" access=\"read\"/>\n"     \
  42         "  <property name=\"Sessions\" type=\"a(so)\" access=\"read\"/>\n" \
  43         "  <property name=\"IdleHint\" type=\"b\" access=\"read\"/>\n"  \
  44         "  <property name=\"IdleSinceHint\" type=\"t\" access=\"read\"/>\n" \
  45         "  <property name=\"IdleSinceHintMonotonic\" type=\"t\" access=\"read\"/>\n" \
  46         " </interface>\n"                                               \
  47
  48 #define INTROSPECTION                                                   \
  49         DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE                       \
  50         "<node>\n"                                                      \
  51         BUS_USER_INTERFACE                                              \
  52         BUS_PROPERTIES_INTERFACE                                        \
  53         BUS_PEER_INTERFACE                                              \
  54         BUS_INTROSPECTABLE_INTERFACE                                    \
  55         "</node>\n"
  56
  57 #define INTERFACES_LIST                              \
  58         BUS_GENERIC_INTERFACES_LIST                  \
  59         "org.freedesktop.login1.User\0"
  60
  61 static int bus_user_append_display(DBusMessageIter *i, const char *property, void *data) {
  62         DBusMessageIter sub;
  63         User *u = data;
  64         const char *id, *path;
  65         char *p = NULL;
  66
  67         assert(i);
  68         assert(property);
  69         assert(u);
  70
  71         if (!dbus_message_iter_open_container(i, DBUS_TYPE_STRUCT, NULL, &sub))
  72                 return -ENOMEM;
  73
  74         if (u->display) {
  75                 id = u->display->id;
  76                 path = p = session_bus_path(u->display);
  77
  78                 if (!p)
  79                         return -ENOMEM;
  80         } else {
  81                 id = "";
  82                 path = "/";
  83         }
  84
  85         if (!dbus_message_iter_append_basic(&sub, DBUS_TYPE_STRING, &id) ||
  86             !dbus_message_iter_append_basic(&sub, DBUS_TYPE_OBJECT_PATH, &path)) {
  87                 free(p);
  88                 return -ENOMEM;
  89         }
  90
  91         free(p);
  92
  93         if (!dbus_message_iter_close_container(i, &sub))
  94                 return -ENOMEM;
  95
  96         return 0;
  97 }
  98
  99 static int bus_user_append_state(DBusMessageIter *i, const char *property, void *data) {
 100         User *u = data;
 101         const char *state;
 102
 103         assert(i);
 104         assert(property);
 105         assert(u);
 106
 107         state = user_state_to_string(user_get_state(u));
 108
 109         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_STRING, &state))
 110                 return -ENOMEM;
 111
 112         return 0;
 113 }
 114
 115 static int bus_user_append_sessions(DBusMessageIter *i, const char *property, void *data) {
 116         DBusMessageIter sub, sub2;
 117         User *u = data;
 118         Session *session;
 119
 120         assert(i);
 121         assert(property);
 122         assert(u);
 123
 124         if (!dbus_message_iter_open_container(i, DBUS_TYPE_ARRAY, "(so)", &sub))
 125                 return -ENOMEM;
 126
 127         LIST_FOREACH(sessions_by_user, session, u->sessions) {
 128                 char *p;
 129
 130                 if (!dbus_message_iter_open_container(&sub, DBUS_TYPE_STRUCT, NULL, &sub2))
 131                         return -ENOMEM;
 132
 133                 p = session_bus_path(session);
 134                 if (!p)
 135                         return -ENOMEM;
 136
 137                 if (!dbus_message_iter_append_basic(&sub2, DBUS_TYPE_STRING, &session->id) ||
 138                     !dbus_message_iter_append_basic(&sub2, DBUS_TYPE_OBJECT_PATH, &p)) {
 139                         free(p);
 140                         return -ENOMEM;
 141                 }
 142
 143                 free(p);
 144
 145                 if (!dbus_message_iter_close_container(&sub, &sub2))
 146                         return -ENOMEM;
 147         }
 148
 149         if (!dbus_message_iter_close_container(i, &sub))
 150                 return -ENOMEM;
 151
 152         return 0;
 153 }
 154
 155 static int bus_user_append_idle_hint(DBusMessageIter *i, const char *property, void *data) {
 156         User *u = data;
 157         dbus_bool_t b;
 158
 159         assert(i);
 160         assert(property);
 161         assert(u);
 162
 163         b = user_get_idle_hint(u, NULL) > 0;
 164
 165         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_BOOLEAN, &b))
 166                 return -ENOMEM;
 167
 168         return 0;
 169 }
 170
 171 static int bus_user_append_idle_hint_since(DBusMessageIter *i, const char *property, void *data) {
 172         User *u = data;
 173         dual_timestamp t;
 174         uint64_t k;
 175
 176         assert(i);
 177         assert(property);
 178         assert(u);
 179
 180         user_get_idle_hint(u, &t);
 181         k = streq(property, "IdleSinceHint") ? t.realtime : t.monotonic;
 182
 183         if (!dbus_message_iter_append_basic(i, DBUS_TYPE_UINT64, &k))
 184                 return -ENOMEM;
 185
 186         return 0;
 187 }
 188
 189 static int get_user_for_path(Manager *m, const char *path, User **_u) {
 190         User *u;
 191         unsigned long lu;
 192         int r;
 193
 194         assert(m);
 195         assert(path);
 196         assert(_u);
 197
 198         if (!startswith(path, "/org/freedesktop/login1/user/"))
 199                 return -EINVAL;
 200
 201         r = safe_atolu(path + 29, &lu);
 202         if (r < 0)
 203                 return r;
 204
 205         u = hashmap_get(m->users, ULONG_TO_PTR(lu));
 206         if (!u)
 207                 return -ENOENT;
 208
 209         *_u = u;
 210         return 0;
 211 }
 212
 213 static DBusHandlerResult user_message_dispatch(
 214                 User *u,
 215                 DBusConnection *connection,
 216                 DBusMessage *message) {
 217
 218         const BusProperty properties[] = {
 219                 { "org.freedesktop.login1.User", "UID",                bus_property_append_uid,    "u",     &u->uid                 },
 220                 { "org.freedesktop.login1.User", "GID",                bus_property_append_gid,    "u",     &u->gid                 },
 221                 { "org.freedesktop.login1.User", "Name",               bus_property_append_string, "s",     u->name                 },
 222                 { "org.freedesktop.login1.User", "Timestamp",          bus_property_append_usec,   "t",     &u->timestamp.realtime  },
 223                 { "org.freedesktop.login1.User", "TimestampMonotonic", bus_property_append_usec,   "t",     &u->timestamp.monotonic },
 224                 { "org.freedesktop.login1.User", "RuntimePath",        bus_property_append_string, "s",     u->runtime_path         },
 225                 { "org.freedesktop.login1.User", "ControlGroupPath",   bus_property_append_string, "s",     u->cgroup_path          },
 226                 { "org.freedesktop.login1.User", "Service",            bus_property_append_string, "s",     u->service              },
 227                 { "org.freedesktop.login1.User", "Display",            bus_user_append_display,    "(so)",  u                       },
 228                 { "org.freedesktop.login1.User", "State",              bus_user_append_state,      "s",     u                       },
 229                 { "org.freedesktop.login1.User", "Sessions",           bus_user_append_sessions,   "a(so)", u                       },
 230                 { "org.freedesktop.login1.User", "IdleHint",           bus_user_append_idle_hint,  "b",     u                       },
 231                 { "org.freedesktop.login1.User", "IdleSinceHint",          bus_user_append_idle_hint_since, "t", u                  },
 232                 { "org.freedesktop.login1.User", "IdleSinceHintMonotonic", bus_user_append_idle_hint_since, "t", u                  },
 233                 { NULL, NULL, NULL, NULL, NULL }
 234         };
 235
 236         DBusError error;
 237         DBusMessage *reply = NULL;
 238         int r;
 239
 240         assert(u);
 241         assert(connection);
 242         assert(message);
 243
 244         if (dbus_message_is_method_call(message, "org.freedesktop.login1.User", "Terminate")) {
 245
 246                 r = user_stop(u);
 247                 if (r < 0)
 248                         return bus_send_error_reply(connection, message, NULL, r);
 249
 250                 reply = dbus_message_new_method_return(message);
 251                 if (!reply)
 252                         goto oom;
 253         } else
 254                 return bus_default_message_handler(connection, message, INTROSPECTION, INTERFACES_LIST, properties);
 255
 256         if (reply) {
 257                 if (!dbus_connection_send(connection, reply, NULL))
 258                         goto oom;
 259
 260                 dbus_message_unref(reply);
 261         }
 262
 263         return DBUS_HANDLER_RESULT_HANDLED;
 264
 265 oom:
 266         if (reply)
 267                 dbus_message_unref(reply);
 268
 269         dbus_error_free(&error);
 270
 271         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 272 }
 273
 274 static DBusHandlerResult user_message_handler(
 275                 DBusConnection *connection,
 276                 DBusMessage *message,
 277                 void *userdata) {
 278
 279         Manager *m = userdata;
 280         User *u;
 281         int r;
 282
 283         r = get_user_for_path(m, dbus_message_get_path(message), &u);
 284         if (r < 0) {
 285
 286                 if (r == -ENOMEM)
 287                         return DBUS_HANDLER_RESULT_NEED_MEMORY;
 288
 289                 if (r == -ENOENT) {
 290                         DBusError e;
 291
 292                         dbus_error_init(&e);
 293                         dbus_set_error_const(&e, DBUS_ERROR_UNKNOWN_OBJECT, "Unknown user");
 294                         return bus_send_error_reply(connection, message, &e, r);
 295                 }
 296
 297                 return bus_send_error_reply(connection, message, NULL, r);
 298         }
 299
 300         return user_message_dispatch(u, connection, message);
 301 }
 302
 303 const DBusObjectPathVTable bus_user_vtable = {
 304         .message_function = user_message_handler
 305 };
 306
 307 char *user_bus_path(User *u) {
 308         char *s;
 309
 310         assert(u);
 311
 312         if (asprintf(&s, "/org/freedesktop/login1/user/%llu", (unsigned long long) u->uid) < 0)
 313                 return NULL;
 314
 315         return s;
 316 }
 317
 318 int user_send_signal(User *u, bool new_user) {
 319         DBusMessage *m;
 320         int r = -ENOMEM;
 321         char *p = NULL;
 322         uint32_t uid;
 323
 324         assert(u);
 325
 326         m = dbus_message_new_signal("/org/freedesktop/login1",
 327                                     "org.freedesktop.login1.Manager",
 328                                     new_user ? "UserNew" : "UserRemoved");
 329
 330         if (!m)
 331                 return -ENOMEM;
 332
 333         p = user_bus_path(u);
 334         if (!p)
 335                 goto finish;
 336
 337         uid = u->uid;
 338
 339         if (!dbus_message_append_args(
 340                             m,
 341                             DBUS_TYPE_UINT32, &uid,
 342                             DBUS_TYPE_OBJECT_PATH, &p,
 343                             DBUS_TYPE_INVALID))
 344                 goto finish;
 345
 346         if (!dbus_connection_send(u->manager->bus, m, NULL))
 347                 goto finish;
 348
 349         r = 0;
 350
 351 finish:
 352         dbus_message_unref(m);
 353         free(p);
 354
 355         return r;
 356 }
 357
 358 int user_send_changed(User *u, const char *properties) {
 359         DBusMessage *m;
 360         int r = -ENOMEM;
 361         char *p = NULL;
 362
 363         assert(u);
 364
 365         if (!u->started)
 366                 return 0;
 367
 368         p = user_bus_path(u);
 369         if (!p)
 370                 return -ENOMEM;
 371
 372         m = bus_properties_changed_new(p, "org.freedesktop.login1.User", properties);
 373         if (!m)
 374                 goto finish;
 375
 376         if (!dbus_connection_send(u->manager->bus, m, NULL))
 377                 goto finish;
 378
 379         r = 0;
 380
 381 finish:
 382         if (m)
 383                 dbus_message_unref(m);
 384         free(p);
 385
 386         return r;
 387 }