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     struct session *session;
 148
 149     if (!(session = pa_hashmap_remove(u->sessions, id)))
 150         return;
 151
 152     free_session(session);
 153 }
 154
 155 static DBusHandlerResult filter_cb(DBusConnection *bus, DBusMessage *message, void *userdata) {
 156     struct userdata *u = userdata;
 157     DBusError error;
 158     const char *path;
 159
 160     pa_assert(bus);
 161     pa_assert(message);
 162     pa_assert(u);
 163
 164     dbus_error_init(&error);
 165
 166     pa_log_debug("dbus: interface=%s, path=%s, member=%s\n",
 167                  dbus_message_get_interface(message),
 168                  dbus_message_get_path(message),
 169                  dbus_message_get_member(message));
 170
 171     if (dbus_message_is_signal(message, "org.freedesktop.ConsoleKit.Seat", "SessionAdded")) {
 172
 173         /* CK API changed to match spec in 0.3 */
 174         if (!dbus_message_get_args(message, &error, DBUS_TYPE_OBJECT_PATH, &path, DBUS_TYPE_INVALID)) {
 175             dbus_error_free(&error);
 176
 177             if (!dbus_message_get_args(message, &error, DBUS_TYPE_STRING, &path, DBUS_TYPE_INVALID)) {
 178                 pa_log_error("Failed to parse SessionAdded message: %s: %s", error.name, error.message);
 179                 goto finish;
 180             }
 181         }
 182
 183         add_session(u, path);
 184
 185     } else if (dbus_message_is_signal(message, "org.freedesktop.ConsoleKit.Seat", "SessionRemoved")) {
 186
 187         /* CK API changed to match spec in 0.3 */
 188         if (!dbus_message_get_args(message, &error, DBUS_TYPE_OBJECT_PATH, &path, DBUS_TYPE_INVALID)) {
 189             dbus_error_free(&error);
 190
 191             if (!dbus_message_get_args(message, &error, DBUS_TYPE_STRING, &path, DBUS_TYPE_INVALID)) {
 192                 pa_log_error("Failed to parse SessionRemoved message: %s: %s", error.name, error.message);
 193                 goto finish;
 194             }
 195         }
 196
 197         remove_session(u, path);
 198     }
 199
 200 finish:
 201     dbus_error_free(&error);
 202
 203     return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 204 }
 205
 206 static int get_session_list(struct userdata *u) {
 207     DBusError error;
 208     DBusMessage *m = NULL, *reply = NULL;
 209     uint32_t uid;
 210     DBusMessageIter iter, sub;
 211     int ret = -1;
 212
 213     pa_assert(u);
 214
 215     dbus_error_init(&error);
 216
 217     if (!(m = dbus_message_new_method_call("org.freedesktop.ConsoleKit", "/org/freedesktop/ConsoleKit/Manager", "org.freedesktop.ConsoleKit.Manager", "GetSessionsForUnixUser"))) {
 218         pa_log("Failed to allocate GetSessionsForUnixUser() method call.");
 219         goto fail;
 220     }
 221
 222     uid = (uint32_t) getuid();
 223     if (!(dbus_message_append_args(m, DBUS_TYPE_UINT32, &uid, DBUS_TYPE_INVALID))) {
 224         pa_log("Failed to append arguments to GetSessionsForUnixUser() method call.");
 225         goto fail;
 226     }
 227
 228     if (!(reply = dbus_connection_send_with_reply_and_block(pa_dbus_connection_get(u->connection), m, -1, &error))) {
 229         pa_log("GetSessionsForUnixUser() call failed: %s: %s", error.name, error.message);
 230         goto fail;
 231     }
 232
 233     dbus_message_iter_init(reply, &iter);
 234
 235     if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
 236         dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_OBJECT_PATH) {
 237         pa_log("Failed to parse GetSessionsForUnixUser() result.");
 238         goto fail;
 239     }
 240
 241     dbus_message_iter_recurse(&iter, &sub);
 242
 243     for (;;) {
 244         int at;
 245         const char *id;
 246
 247         if ((at = dbus_message_iter_get_arg_type(&sub)) == DBUS_TYPE_INVALID)
 248             break;
 249
 250         assert(at == DBUS_TYPE_OBJECT_PATH);
 251         dbus_message_iter_get_basic(&sub, &id);
 252
 253         add_session(u, id);
 254
 255         dbus_message_iter_next(&sub);
 256     }
 257
 258     ret = 0;
 259
 260 fail:
 261
 262     if (m)
 263         dbus_message_unref(m);
 264
 265     if (reply)
 266         dbus_message_unref(reply);
 267
 268     dbus_error_free(&error);
 269
 270     return ret;
 271 }
 272
 273 int pa__init(pa_module*m) {
 274     DBusError error;
 275     pa_dbus_connection *connection;
 276     struct userdata *u = NULL;
 277     pa_modargs *ma;
 278
 279     pa_assert(m);
 280
 281     dbus_error_init(&error);
 282
 283     /* If systemd's logind service is running, we shouldn't watch ConsoleKit
 284      * but login */
 285     if (access("/run/systemd/seats/", F_OK) >= 0)
 286         return 0;
 287
 288     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 289         pa_log("Failed to parse module arguments");
 290         goto fail;
 291     }
 292
 293     if (!(connection = pa_dbus_bus_get(m->core, DBUS_BUS_SYSTEM, &error)) || dbus_error_is_set(&error)) {
 294
 295         if (connection)
 296             pa_dbus_connection_unref(connection);
 297
 298         pa_log_error("Unable to contact D-Bus system bus: %s: %s", error.name, error.message);
 299         goto fail;
 300     }
 301
 302     m->userdata = u = pa_xnew0(struct userdata, 1);
 303     u->core = m->core;
 304     u->module = m;
 305     u->connection = connection;
 306     u->sessions = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
 307
 308     if (!dbus_connection_add_filter(pa_dbus_connection_get(connection), filter_cb, u, NULL)) {
 309         pa_log_error("Failed to add filter function");
 310         goto fail;
 311     }
 312
 313     u->filter_added = true;
 314
 315     if (pa_dbus_add_matches(
 316                 pa_dbus_connection_get(connection), &error,
 317                 "type='signal',sender='org.freedesktop.ConsoleKit',interface='org.freedesktop.ConsoleKit.Seat',member='SessionAdded'",
 318                 "type='signal',sender='org.freedesktop.ConsoleKit',interface='org.freedesktop.ConsoleKit.Seat',member='SessionRemoved'", NULL) < 0) {
 319         pa_log_error("Unable to subscribe to ConsoleKit signals: %s: %s", error.name, error.message);
 320         goto fail;
 321     }
 322
 323     if (get_session_list(u) < 0)
 324         goto fail;
 325
 326     pa_modargs_free(ma);
 327
 328     return 0;
 329
 330 fail:
 331     if (ma)
 332         pa_modargs_free(ma);
 333
 334     dbus_error_free(&error);
 335     pa__done(m);
 336
 337     return -1;
 338 }
 339
 340 void pa__done(pa_module *m) {
 341     struct userdata *u;
 342
 343     pa_assert(m);
 344
 345     if (!(u = m->userdata))
 346         return;
 347
 348     if (u->sessions)
 349         pa_hashmap_free(u->sessions, (pa_free_cb_t) free_session);
 350
 351     if (u->connection) {
 352         pa_dbus_remove_matches(
 353                 pa_dbus_connection_get(u->connection),
 354                 "type='signal',sender='org.freedesktop.ConsoleKit',interface='org.freedesktop.ConsoleKit.Seat',member='SessionAdded'",
 355                 "type='signal',sender='org.freedesktop.ConsoleKit',interface='org.freedesktop.ConsoleKit.Seat',member='SessionRemoved'", NULL);
 356
 357         if (u->filter_added)
 358             dbus_connection_remove_filter(pa_dbus_connection_get(u->connection), filter_cb, u);
 359
 360         pa_dbus_connection_unref(u->connection);
 361     }
 362
 363     pa_xfree(u);
 364 }