code.delx.au - pulseaudio/blob - src/modules/module-console-kit.c

   1 /***
   2     This file is part of PulseAudio.
   3
   4     Copyright 2008 Lennart Poettering
   5
   6     PulseAudio is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU Lesser General Public License as published
   8     by the Free Software Foundation; either version 2.1 of the License,
   9     or (at your option) any later version.
  10
  11     PulseAudio is distributed in the hope that it will be useful, but
  12     WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14     General Public License for more details.
  15
  16     You should have received a copy of the GNU Lesser General Public License
  17     along with PulseAudio; if not, write to the Free Software
  18     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19     USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <stdio.h>
  27 #include <unistd.h>
  28 #include <stdlib.h>
  29 #include <errno.h>
  30 #include <stdlib.h>
  31 #include <sys/types.h>
  32
  33 #ifdef HAVE_SYSTEMD
  34 #include <systemd/sd-login.h>
  35 #include <systemd/sd-daemon.h>
  36 #endif
  37
  38 #include <pulse/xmalloc.h>
  39
  40 #include <pulsecore/module.h>
  41 #include <pulsecore/log.h>
  42 #include <pulsecore/hashmap.h>
  43 #include <pulsecore/idxset.h>
  44 #include <pulsecore/modargs.h>
  45 #include <pulsecore/dbus-shared.h>
  46
  47 #include "module-console-kit-symdef.h"
  48
  49 PA_MODULE_AUTHOR("Lennart Poettering");
  50 PA_MODULE_DESCRIPTION("Create a client for each ConsoleKit session of this user");
  51 PA_MODULE_VERSION(PACKAGE_VERSION);
  52 PA_MODULE_LOAD_ONCE(TRUE);
  53
  54 static const char* const valid_modargs[] = {
  55     NULL
  56 };
  57
  58 struct session {
  59     char *id;
  60     pa_client *client;
  61 };
  62
  63 struct userdata {
  64     pa_module *module;
  65     pa_core *core;
  66     pa_dbus_connection *connection;
  67     pa_hashmap *sessions;
  68     pa_bool_t filter_added;
  69 };
  70
  71 static void add_session(struct userdata *u, const char *id) {
  72     DBusError error;
  73     DBusMessage *m = NULL, *reply = NULL;
  74     uint32_t uid;
  75     struct session *session;
  76     pa_client_new_data data;
  77
  78     dbus_error_init(&error);
  79
  80     if (pa_hashmap_get(u->sessions, id)) {
  81         pa_log_warn("Duplicate session %s, ignoring.", id);
  82         return;
  83     }
  84
  85     if (!(m = dbus_message_new_method_call("org.freedesktop.ConsoleKit", id, "org.freedesktop.ConsoleKit.Session", "GetUnixUser"))) {
  86         pa_log("Failed to allocate GetUnixUser() method call.");
  87         goto fail;
  88     }
  89
  90     if (!(reply = dbus_connection_send_with_reply_and_block(pa_dbus_connection_get(u->connection), m, -1, &error))) {
  91         pa_log("GetUnixUser() call failed: %s: %s", error.name, error.message);
  92         goto fail;
  93     }
  94
  95     /* CK 0.3 this changed from int32 to uint32 */
  96     if (!dbus_message_get_args(reply, &error, DBUS_TYPE_UINT32, &uid, DBUS_TYPE_INVALID)) {
  97         dbus_error_free(&error);
  98
  99         if (!dbus_message_get_args(reply, &error, DBUS_TYPE_INT32, &uid, DBUS_TYPE_INVALID)) {
 100             pa_log("Failed to parse GetUnixUser() result: %s: %s", error.name, error.message);
 101             goto fail;
 102         }
 103     }
 104
 105     /* We only care about our own sessions */
 106     if ((uid_t) uid != getuid())
 107         goto fail;
 108
 109     session = pa_xnew(struct session, 1);
 110     session->id = pa_xstrdup(id);
 111
 112     pa_client_new_data_init(&data);
 113     data.module = u->module;
 114     data.driver = __FILE__;
 115     pa_proplist_setf(data.proplist, PA_PROP_APPLICATION_NAME, "ConsoleKit Session %s", id);
 116     pa_proplist_sets(data.proplist, "console-kit.session", id);
 117     session->client = pa_client_new(u->core, &data);
 118     pa_client_new_data_done(&data);
 119
 120     if (!session->client) {
 121         pa_xfree(session->id);
 122         pa_xfree(session);
 123         goto fail;
 124     }
 125
 126     pa_hashmap_put(u->sessions, session->id, session);
 127
 128     pa_log_debug("Added new session %s", id);
 129
 130 fail:
 131
 132     if (m)
 133         dbus_message_unref(m);
 134
 135     if (reply)
 136         dbus_message_unref(reply);
 137
 138     dbus_error_free(&error);
 139 }
 140
 141 static void free_session(struct session *session) {
 142     pa_assert(session);
 143
 144     pa_log_debug("Removing session %s", session->id);
 145
 146     pa_client_free(session->client);
 147     pa_xfree(session->id);
 148     pa_xfree(session);
 149 }
 150
 151 static void remove_session(struct userdata *u, const char *id) {
 152     struct session *session;
 153
 154     if (!(session = pa_hashmap_remove(u->sessions, id)))
 155         return;
 156
 157     free_session(session);
 158 }
 159
 160 static DBusHandlerResult filter_cb(DBusConnection *bus, DBusMessage *message, void *userdata) {
 161     struct userdata *u = userdata;
 162     DBusError error;
 163     const char *path;
 164
 165     pa_assert(bus);
 166     pa_assert(message);
 167     pa_assert(u);
 168
 169     dbus_error_init(&error);
 170
 171     pa_log_debug("dbus: interface=%s, path=%s, member=%s\n",
 172                  dbus_message_get_interface(message),
 173                  dbus_message_get_path(message),
 174                  dbus_message_get_member(message));
 175
 176     if (dbus_message_is_signal(message, "org.freedesktop.ConsoleKit.Seat", "SessionAdded")) {
 177
 178         /* CK API changed to match spec in 0.3 */
 179         if (!dbus_message_get_args(message, &error, DBUS_TYPE_OBJECT_PATH, &path, DBUS_TYPE_INVALID)) {
 180             dbus_error_free(&error);
 181
 182             if (!dbus_message_get_args(message, &error, DBUS_TYPE_STRING, &path, DBUS_TYPE_INVALID)) {
 183                 pa_log_error("Failed to parse SessionAdded message: %s: %s", error.name, error.message);
 184                 goto finish;
 185             }
 186         }
 187
 188         add_session(u, path);
 189
 190     } else if (dbus_message_is_signal(message, "org.freedesktop.ConsoleKit.Seat", "SessionRemoved")) {
 191
 192         /* CK API changed to match spec in 0.3 */
 193         if (!dbus_message_get_args(message, &error, DBUS_TYPE_OBJECT_PATH, &path, DBUS_TYPE_INVALID)) {
 194             dbus_error_free(&error);
 195
 196             if (!dbus_message_get_args(message, &error, DBUS_TYPE_STRING, &path, DBUS_TYPE_INVALID)) {
 197                 pa_log_error("Failed to parse SessionRemoved message: %s: %s", error.name, error.message);
 198                 goto finish;
 199             }
 200         }
 201
 202         remove_session(u, path);
 203     }
 204
 205 finish:
 206     dbus_error_free(&error);
 207
 208     return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 209 }
 210
 211 static int get_session_list(struct userdata *u) {
 212     DBusError error;
 213     DBusMessage *m = NULL, *reply = NULL;
 214     uint32_t uid;
 215     DBusMessageIter iter, sub;
 216     int ret = -1;
 217
 218     pa_assert(u);
 219
 220     dbus_error_init(&error);
 221
 222     if (!(m = dbus_message_new_method_call("org.freedesktop.ConsoleKit", "/org/freedesktop/ConsoleKit/Manager", "org.freedesktop.ConsoleKit.Manager", "GetSessionsForUnixUser"))) {
 223         pa_log("Failed to allocate GetSessionsForUnixUser() method call.");
 224         goto fail;
 225     }
 226
 227     uid = (uint32_t) getuid();
 228     if (!(dbus_message_append_args(m, DBUS_TYPE_UINT32, &uid, DBUS_TYPE_INVALID))) {
 229         pa_log("Failed to append arguments to GetSessionsForUnixUser() method call.");
 230         goto fail;
 231     }
 232
 233     if (!(reply = dbus_connection_send_with_reply_and_block(pa_dbus_connection_get(u->connection), m, -1, &error))) {
 234         pa_log("GetSessionsForUnixUser() call failed: %s: %s", error.name, error.message);
 235         goto fail;
 236     }
 237
 238     dbus_message_iter_init(reply, &iter);
 239
 240     if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
 241         dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_OBJECT_PATH) {
 242         pa_log("Failed to parse GetSessionsForUnixUser() result.");
 243         goto fail;
 244     }
 245
 246     dbus_message_iter_recurse(&iter, &sub);
 247
 248     for (;;) {
 249         int at;
 250         const char *id;
 251
 252         if ((at = dbus_message_iter_get_arg_type(&sub)) == DBUS_TYPE_INVALID)
 253             break;
 254
 255         assert(at == DBUS_TYPE_OBJECT_PATH);
 256         dbus_message_iter_get_basic(&sub, &id);
 257
 258         add_session(u, id);
 259
 260         dbus_message_iter_next(&sub);
 261     }
 262
 263     ret = 0;
 264
 265 fail:
 266
 267     if (m)
 268         dbus_message_unref(m);
 269
 270     if (reply)
 271         dbus_message_unref(reply);
 272
 273     dbus_error_free(&error);
 274
 275     return ret;
 276 }
 277
 278 int pa__init(pa_module*m) {
 279     DBusError error;
 280     pa_dbus_connection *connection;
 281     struct userdata *u = NULL;
 282     pa_modargs *ma;
 283
 284     pa_assert(m);
 285
 286     dbus_error_init(&error);
 287
 288 #ifdef HAVE_SYSTEMD
 289     /* If systemd support is enabled and we boot on systemd we
 290        shouldn't watch ConsoleKit but systemd's logind service. */
 291     if (sd_booted() > 0)
 292         return 0;
 293 #endif
 294
 295     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 296         pa_log("Failed to parse module arguments");
 297         goto fail;
 298     }
 299
 300     if (!(connection = pa_dbus_bus_get(m->core, DBUS_BUS_SYSTEM, &error)) || dbus_error_is_set(&error)) {
 301
 302         if (connection)
 303             pa_dbus_connection_unref(connection);
 304
 305         pa_log_error("Unable to contact D-Bus system bus: %s: %s", error.name, error.message);
 306         goto fail;
 307     }
 308
 309     m->userdata = u = pa_xnew0(struct userdata, 1);
 310     u->core = m->core;
 311     u->module = m;
 312     u->connection = connection;
 313     u->sessions = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
 314
 315     if (!dbus_connection_add_filter(pa_dbus_connection_get(connection), filter_cb, u, NULL)) {
 316         pa_log_error("Failed to add filter function");
 317         goto fail;
 318     }
 319
 320     u->filter_added = TRUE;
 321
 322     if (pa_dbus_add_matches(
 323                 pa_dbus_connection_get(connection), &error,
 324                 "type='signal',sender='org.freedesktop.ConsoleKit',interface='org.freedesktop.ConsoleKit.Seat',member='SessionAdded'",
 325                 "type='signal',sender='org.freedesktop.ConsoleKit',interface='org.freedesktop.ConsoleKit.Seat',member='SessionRemoved'", NULL) < 0) {
 326         pa_log_error("Unable to subscribe to ConsoleKit signals: %s: %s", error.name, error.message);
 327         goto fail;
 328     }
 329
 330     if (get_session_list(u) < 0)
 331         goto fail;
 332
 333     pa_modargs_free(ma);
 334
 335     return 0;
 336
 337 fail:
 338     if (ma)
 339         pa_modargs_free(ma);
 340
 341     dbus_error_free(&error);
 342     pa__done(m);
 343
 344     return -1;
 345 }
 346
 347
 348 void pa__done(pa_module *m) {
 349     struct userdata *u;
 350
 351     pa_assert(m);
 352
 353     if (!(u = m->userdata))
 354         return;
 355
 356     if (u->sessions)
 357         pa_hashmap_free(u->sessions, (pa_free_cb_t) free_session);
 358
 359     if (u->connection) {
 360         pa_dbus_remove_matches(
 361                 pa_dbus_connection_get(u->connection),
 362                 "type='signal',sender='org.freedesktop.ConsoleKit',interface='org.freedesktop.ConsoleKit.Seat',member='SessionAdded'",
 363                 "type='signal',sender='org.freedesktop.ConsoleKit',interface='org.freedesktop.ConsoleKit.Seat',member='SessionRemoved'", NULL);
 364
 365         if (u->filter_added)
 366             dbus_connection_remove_filter(pa_dbus_connection_get(u->connection), filter_cb, u);
 367
 368         pa_dbus_connection_unref(u->connection);
 369     }
 370
 371     pa_xfree(u);
 372 }