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 #include <pulse/xmalloc.h>
  34
  35 #include <pulsecore/module.h>
  36 #include <pulsecore/log.h>
  37 #include <pulsecore/hashmap.h>
  38 #include <pulsecore/idxset.h>
  39 #include <pulsecore/modargs.h>
  40 #include <pulsecore/dbus-shared.h>
  41
  42 #include "module-console-kit-symdef.h"
  43
  44 PA_MODULE_AUTHOR("Lennart Poettering");
  45 PA_MODULE_DESCRIPTION("Create a client for each ConsoleKit session of this user");
  46 PA_MODULE_VERSION(PACKAGE_VERSION);
  47 PA_MODULE_LOAD_ONCE(true);
  48
  49 static const char* const valid_modargs[] = {
  50     NULL
  51 };
  52
  53 struct session {
  54     char *id;
  55     pa_client *client;
  56 };
  57
  58 struct userdata {
  59     pa_module *module;
  60     pa_core *core;
  61     pa_dbus_connection *connection;
  62     pa_hashmap *sessions;
  63     bool filter_added;
  64 };
  65
  66 static void add_session(struct userdata *u, const char *id) {
  67     DBusError error;
  68     DBusMessage *m = NULL, *reply = NULL;
  69     uint32_t uid;
  70     struct session *session;
  71     pa_client_new_data data;
  72
  73     dbus_error_init(&error);
  74
  75     if (pa_hashmap_get(u->sessions, id)) {
  76         pa_log_warn("Duplicate session %s, ignoring.", id);
  77         return;
  78     }
  79
  80     if (!(m = dbus_message_new_method_call("org.freedesktop.ConsoleKit", id, "org.freedesktop.ConsoleKit.Session", "GetUnixUser"))) {
  81         pa_log("Failed to allocate GetUnixUser() method call.");
  82         goto fail;
  83     }
  84
  85     if (!(reply = dbus_connection_send_with_reply_and_block(pa_dbus_connection_get(u->connection), m, -1, &error))) {
  86         pa_log("GetUnixUser() call failed: %s: %s", error.name, error.message);
  87         goto fail;
  88     }
  89
  90     /* CK 0.3 this changed from int32 to uint32 */
  91     if (!dbus_message_get_args(reply, &error, DBUS_TYPE_UINT32, &uid, DBUS_TYPE_INVALID)) {
  92         dbus_error_free(&error);
  93
  94         if (!dbus_message_get_args(reply, &error, DBUS_TYPE_INT32, &uid, DBUS_TYPE_INVALID)) {
  95             pa_log("Failed to parse GetUnixUser() result: %s: %s", error.name, error.message);
  96             goto fail;
  97         }
  98     }
  99
 100     /* We only care about our own sessions */
 101     if ((uid_t) uid != getuid())
 102         goto fail;
 103
 104     session = pa_xnew(struct session, 1);
 105     session->id = pa_xstrdup(id);
 106
 107     pa_client_new_data_init(&data);
 108     data.module = u->module;
 109     data.driver = __FILE__;
 110     pa_proplist_setf(data.proplist, PA_PROP_APPLICATION_NAME, "ConsoleKit Session %s", id);
 111     pa_proplist_sets(data.proplist, "console-kit.session", id);
 112     session->client = pa_client_new(u->core, &data);
 113     pa_client_new_data_done(&data);
 114
 115     if (!session->client) {
 116         pa_xfree(session->id);
 117         pa_xfree(session);
 118         goto fail;
 119     }
 120
 121     pa_hashmap_put(u->sessions, session->id, session);
 122
 123     pa_log_debug("Added new session %s", id);
 124
 125 fail:
 126
 127     if (m)
 128         dbus_message_unref(m);
 129
 130     if (reply)
 131         dbus_message_unref(reply);
 132
 133     dbus_error_free(&error);
 134 }
 135
 136 static void free_session(struct session *session) {
 137     pa_assert(session);
 138
 139     pa_log_debug("Removing session %s", session->id);
 140
 141     pa_client_free(session->client);
 142     pa_xfree(session->id);
 143     pa_xfree(session);
 144 }
 145
 146 static void remove_session(struct userdata *u, const char *id) {
 147     pa_assert(u);
 148     pa_assert(id);
 149
 150     pa_hashmap_remove_and_free(u->sessions, id);
 151 }
 152
 153 static DBusHandlerResult filter_cb(DBusConnection *bus, DBusMessage *message, void *userdata) {
 154     struct userdata *u = userdata;
 155     DBusError error;
 156     const char *path;
 157
 158     pa_assert(bus);
 159     pa_assert(message);
 160     pa_assert(u);
 161
 162     dbus_error_init(&error);
 163
 164     if (dbus_message_is_signal(message, "org.freedesktop.ConsoleKit.Seat", "SessionAdded")) {
 165
 166         /* CK API changed to match spec in 0.3 */
 167         if (!dbus_message_get_args(message, &error, DBUS_TYPE_OBJECT_PATH, &path, DBUS_TYPE_INVALID)) {
 168             dbus_error_free(&error);
 169
 170             if (!dbus_message_get_args(message, &error, DBUS_TYPE_STRING, &path, DBUS_TYPE_INVALID)) {
 171                 pa_log_error("Failed to parse SessionAdded message: %s: %s", error.name, error.message);
 172                 goto finish;
 173             }
 174         }
 175
 176         add_session(u, path);
 177
 178     } else if (dbus_message_is_signal(message, "org.freedesktop.ConsoleKit.Seat", "SessionRemoved")) {
 179
 180         /* CK API changed to match spec in 0.3 */
 181         if (!dbus_message_get_args(message, &error, DBUS_TYPE_OBJECT_PATH, &path, DBUS_TYPE_INVALID)) {
 182             dbus_error_free(&error);
 183
 184             if (!dbus_message_get_args(message, &error, DBUS_TYPE_STRING, &path, DBUS_TYPE_INVALID)) {
 185                 pa_log_error("Failed to parse SessionRemoved message: %s: %s", error.name, error.message);
 186                 goto finish;
 187             }
 188         }
 189
 190         remove_session(u, path);
 191     }
 192
 193 finish:
 194     dbus_error_free(&error);
 195
 196     return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 197 }
 198
 199 static int get_session_list(struct userdata *u) {
 200     DBusError error;
 201     DBusMessage *m = NULL, *reply = NULL;
 202     uint32_t uid;
 203     DBusMessageIter iter, sub;
 204     int ret = -1;
 205
 206     pa_assert(u);
 207
 208     dbus_error_init(&error);
 209
 210     if (!(m = dbus_message_new_method_call("org.freedesktop.ConsoleKit", "/org/freedesktop/ConsoleKit/Manager", "org.freedesktop.ConsoleKit.Manager", "GetSessionsForUnixUser"))) {
 211         pa_log("Failed to allocate GetSessionsForUnixUser() method call.");
 212         goto fail;
 213     }
 214
 215     uid = (uint32_t) getuid();
 216     if (!(dbus_message_append_args(m, DBUS_TYPE_UINT32, &uid, DBUS_TYPE_INVALID))) {
 217         pa_log("Failed to append arguments to GetSessionsForUnixUser() method call.");
 218         goto fail;
 219     }
 220
 221     if (!(reply = dbus_connection_send_with_reply_and_block(pa_dbus_connection_get(u->connection), m, -1, &error))) {
 222         pa_log("GetSessionsForUnixUser() call failed: %s: %s", error.name, error.message);
 223         goto fail;
 224     }
 225
 226     dbus_message_iter_init(reply, &iter);
 227
 228     if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
 229         dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_OBJECT_PATH) {
 230         pa_log("Failed to parse GetSessionsForUnixUser() result.");
 231         goto fail;
 232     }
 233
 234     dbus_message_iter_recurse(&iter, &sub);
 235
 236     for (;;) {
 237         int at;
 238         const char *id;
 239
 240         if ((at = dbus_message_iter_get_arg_type(&sub)) == DBUS_TYPE_INVALID)
 241             break;
 242
 243         assert(at == DBUS_TYPE_OBJECT_PATH);
 244         dbus_message_iter_get_basic(&sub, &id);
 245
 246         add_session(u, id);
 247
 248         dbus_message_iter_next(&sub);
 249     }
 250
 251     ret = 0;
 252
 253 fail:
 254
 255     if (m)
 256         dbus_message_unref(m);
 257
 258     if (reply)
 259         dbus_message_unref(reply);
 260
 261     dbus_error_free(&error);
 262
 263     return ret;
 264 }
 265
 266 int pa__init(pa_module*m) {
 267     DBusError error;
 268     pa_dbus_connection *connection;
 269     struct userdata *u = NULL;
 270     pa_modargs *ma;
 271
 272     pa_assert(m);
 273
 274     dbus_error_init(&error);
 275
 276     /* If systemd's logind service is running, we shouldn't watch ConsoleKit
 277      * but login */
 278     if (access("/run/systemd/seats/", F_OK) >= 0)
 279         return 0;
 280
 281     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 282         pa_log("Failed to parse module arguments");
 283         goto fail;
 284     }
 285
 286     if (!(connection = pa_dbus_bus_get(m->core, DBUS_BUS_SYSTEM, &error)) || dbus_error_is_set(&error)) {
 287
 288         if (connection)
 289             pa_dbus_connection_unref(connection);
 290
 291         pa_log_error("Unable to contact D-Bus system bus: %s: %s", error.name, error.message);
 292         goto fail;
 293     }
 294
 295     m->userdata = u = pa_xnew0(struct userdata, 1);
 296     u->core = m->core;
 297     u->module = m;
 298     u->connection = connection;
 299     u->sessions = pa_hashmap_new_full(pa_idxset_string_hash_func, pa_idxset_string_compare_func, NULL, (pa_free_cb_t) free_session);
 300
 301     if (!dbus_connection_add_filter(pa_dbus_connection_get(connection), filter_cb, u, NULL)) {
 302         pa_log_error("Failed to add filter function");
 303         goto fail;
 304     }
 305
 306     u->filter_added = true;
 307
 308     if (pa_dbus_add_matches(
 309                 pa_dbus_connection_get(connection), &error,
 310                 "type='signal',sender='org.freedesktop.ConsoleKit',interface='org.freedesktop.ConsoleKit.Seat',member='SessionAdded'",
 311                 "type='signal',sender='org.freedesktop.ConsoleKit',interface='org.freedesktop.ConsoleKit.Seat',member='SessionRemoved'", NULL) < 0) {
 312         pa_log_error("Unable to subscribe to ConsoleKit signals: %s: %s", error.name, error.message);
 313         goto fail;
 314     }
 315
 316     if (get_session_list(u) < 0)
 317         goto fail;
 318
 319     pa_modargs_free(ma);
 320
 321     return 0;
 322
 323 fail:
 324     if (ma)
 325         pa_modargs_free(ma);
 326
 327     dbus_error_free(&error);
 328     pa__done(m);
 329
 330     return -1;
 331 }
 332
 333 void pa__done(pa_module *m) {
 334     struct userdata *u;
 335
 336     pa_assert(m);
 337
 338     if (!(u = m->userdata))
 339         return;
 340
 341     if (u->sessions)
 342         pa_hashmap_free(u->sessions);
 343
 344     if (u->connection) {
 345         pa_dbus_remove_matches(
 346                 pa_dbus_connection_get(u->connection),
 347                 "type='signal',sender='org.freedesktop.ConsoleKit',interface='org.freedesktop.ConsoleKit.Seat',member='SessionAdded'",
 348                 "type='signal',sender='org.freedesktop.ConsoleKit',interface='org.freedesktop.ConsoleKit.Seat',member='SessionRemoved'", NULL);
 349
 350         if (u->filter_added)
 351             dbus_connection_remove_filter(pa_dbus_connection_get(u->connection), filter_cb, u);
 352
 353         pa_dbus_connection_unref(u->connection);
 354     }
 355
 356     pa_xfree(u);
 357 }