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 <string.h>
  29 #include <stdlib.h>
  30 #include <errno.h>
  31 #include <stdlib.h>
  32 #include <sys/types.h>
  33 #include <sys/stat.h>
  34
  35 #include <pulse/xmalloc.h>
  36 #include <pulse/timeval.h>
  37
  38 #include <pulsecore/core-error.h>
  39 #include <pulsecore/module.h>
  40 #include <pulsecore/log.h>
  41 #include <pulsecore/hashmap.h>
  42 #include <pulsecore/idxset.h>
  43 #include <pulsecore/core-util.h>
  44 #include <pulsecore/namereg.h>
  45 #include <pulsecore/core-scache.h>
  46 #include <pulsecore/modargs.h>
  47
  48 #include "dbus-util.h"
  49 #include "module-console-kit-symdef.h"
  50
  51 PA_MODULE_AUTHOR("Lennart Poettering");
  52 PA_MODULE_DESCRIPTION("Create a client for each ConsoleKit session of this user");
  53 PA_MODULE_VERSION(PACKAGE_VERSION);
  54 PA_MODULE_LOAD_ONCE(TRUE);
  55
  56 static const char* const valid_modargs[] = {
  57     NULL
  58 };
  59
  60 struct session {
  61     char *id;
  62     pa_client *client;
  63 };
  64
  65 struct userdata {
  66     pa_module *module;
  67     pa_core *core;
  68     pa_dbus_connection *connection;
  69     pa_hashmap *sessions;
  70 };
  71
  72 static void add_session(struct userdata *u, const char *id) {
  73     DBusError error;
  74     DBusMessage *m = NULL, *reply = NULL;
  75     uint32_t uid;
  76     struct session *session;
  77     pa_client_new_data data;
  78
  79     dbus_error_init (&error);
  80
  81     if (pa_hashmap_get(u->sessions, id)) {
  82         pa_log_warn("Duplicate session %s, ignoring.", id);
  83         return;
  84     }
  85
  86     if (!(m = dbus_message_new_method_call("org.freedesktop.ConsoleKit", id, "org.freedesktop.ConsoleKit.Session", "GetUnixUser"))) {
  87         pa_log("Failed to allocate GetUnixUser() method call.");
  88         goto fail;
  89     }
  90
  91     if (!(reply = dbus_connection_send_with_reply_and_block(pa_dbus_connection_get(u->connection), m, -1, &error))) {
  92         pa_log("GetUnixUser() call failed: %s: %s", error.name, error.message);
  93         goto fail;
  94     }
  95
  96     /* CK 0.3 this changed from int32 to uint32 */
  97     if (!dbus_message_get_args(reply, &error, DBUS_TYPE_UINT32, &uid, DBUS_TYPE_INVALID)) {
  98         dbus_error_free(&error);
  99
 100         if (!dbus_message_get_args(reply, &error, DBUS_TYPE_INT32, &uid, DBUS_TYPE_INVALID)) {
 101             pa_log("Failed to parse GetUnixUser() result: %s: %s", error.name, error.message);
 102             goto fail;
 103         }
 104     }
 105
 106     /* We only care about our own sessions */
 107     if ((uid_t) uid != getuid())
 108         goto fail;
 109
 110     session = pa_xnew(struct session, 1);
 111     session->id = pa_xstrdup(id);
 112
 113     pa_client_new_data_init(&data);
 114     data.module = u->module;
 115     data.driver = __FILE__;
 116     pa_proplist_setf(data.proplist, PA_PROP_APPLICATION_NAME, "ConsoleKit Session %s", id);
 117     pa_proplist_sets(data.proplist, "console-kit.session", id);
 118     session->client = pa_client_new(u->core, &data);
 119     pa_client_new_data_done(&data);
 120
 121     if (!session->client) {
 122         pa_xfree(session->id);
 123         pa_xfree(session);
 124         goto fail;
 125     }
 126
 127     pa_hashmap_put(u->sessions, session->id, session);
 128
 129     pa_log_debug("Added new session %s", id);
 130
 131 fail:
 132
 133     if (m)
 134         dbus_message_unref(m);
 135
 136     if (reply)
 137         dbus_message_unref(reply);
 138
 139     dbus_error_free(&error);
 140 }
 141
 142 static void free_session(struct session *session) {
 143     pa_assert(session);
 144
 145     pa_log_debug("Removing session %s", session->id);
 146
 147     pa_client_free(session->client);
 148     pa_xfree(session->id);
 149     pa_xfree(session);
 150 }
 151
 152 static void remove_session(struct userdata *u, const char *id) {
 153     struct session *session;
 154
 155     if (!(session = pa_hashmap_remove(u->sessions, id)))
 156         return;
 157
 158     free_session(session);
 159 }
 160
 161 static DBusHandlerResult filter_cb(DBusConnection *bus, DBusMessage *message, void *userdata) {
 162     struct userdata *u = userdata;
 163     DBusError error;
 164     const char *path;
 165
 166     pa_assert(bus);
 167     pa_assert(message);
 168     pa_assert(u);
 169
 170     dbus_error_init(&error);
 171
 172     pa_log_debug("dbus: interface=%s, path=%s, member=%s\n",
 173                  dbus_message_get_interface(message),
 174                  dbus_message_get_path(message),
 175                  dbus_message_get_member(message));
 176
 177     if (dbus_message_is_signal(message, "org.freedesktop.ConsoleKit.Seat", "SessionAdded")) {
 178
 179         /* CK API changed to match spec in 0.3 */
 180         if (!dbus_message_get_args(message, &error, DBUS_TYPE_OBJECT_PATH, &path, DBUS_TYPE_INVALID)) {
 181             dbus_error_free(&error);
 182
 183             if (!dbus_message_get_args(message, &error, DBUS_TYPE_STRING, &path, DBUS_TYPE_INVALID)) {
 184                 pa_log_error("Failed to parse SessionAdded message: %s: %s", error.name, error.message);
 185                 goto finish;
 186             }
 187         }
 188
 189         add_session(u, path);
 190         return DBUS_HANDLER_RESULT_HANDLED;
 191
 192     } else if (dbus_message_is_signal(message, "org.freedesktop.ConsoleKit.Seat", "SessionRemoved")) {
 193
 194         /* CK API changed to match spec in 0.3 */
 195         if (!dbus_message_get_args(message, &error, DBUS_TYPE_OBJECT_PATH, &path, DBUS_TYPE_INVALID)) {
 196             dbus_error_free(&error);
 197
 198             if (!dbus_message_get_args(message, &error, DBUS_TYPE_STRING, &path, DBUS_TYPE_INVALID)) {
 199                 pa_log_error("Failed to parse SessionRemoved message: %s: %s", error.name, error.message);
 200                 goto finish;
 201             }
 202         }
 203
 204         remove_session(u, path);
 205         return DBUS_HANDLER_RESULT_HANDLED;
 206     }
 207
 208 finish:
 209     dbus_error_free(&error);
 210
 211     return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 212 }
 213
 214 static int get_session_list(struct userdata *u) {
 215     DBusError error;
 216     DBusMessage *m = NULL, *reply = NULL;
 217     uint32_t uid;
 218     DBusMessageIter iter, sub;
 219     int ret = -1;
 220
 221     pa_assert(u);
 222
 223     dbus_error_init(&error);
 224
 225     if (!(m = dbus_message_new_method_call("org.freedesktop.ConsoleKit", "/org/freedesktop/ConsoleKit/Manager", "org.freedesktop.ConsoleKit.Manager", "GetSessionsForUnixUser"))) {
 226         pa_log("Failed to allocate GetSessionsForUnixUser() method call.");
 227         goto fail;
 228     }
 229
 230     uid = (uint32_t) getuid();
 231     if (!(dbus_message_append_args(m, DBUS_TYPE_UINT32, &uid, DBUS_TYPE_INVALID))) {
 232         pa_log("Failed to append arguments to GetSessionsForUnixUser() method call.");
 233         goto fail;
 234     }
 235
 236     if (!(reply = dbus_connection_send_with_reply_and_block(pa_dbus_connection_get(u->connection), m, -1, &error))) {
 237         pa_log("GetSessionsForUnixUser() call failed: %s: %s", error.name, error.message);
 238         goto fail;
 239     }
 240
 241     dbus_message_iter_init(reply, &iter);
 242
 243     if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
 244         dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_OBJECT_PATH) {
 245         pa_log("Failed to parse GetSessionsForUnixUser() result.");
 246         goto fail;
 247     }
 248
 249     dbus_message_iter_recurse(&iter, &sub);
 250
 251     for (;;) {
 252         int at;
 253         const char *id;
 254
 255         if ((at = dbus_message_iter_get_arg_type(&sub)) == DBUS_TYPE_INVALID)
 256             break;
 257
 258         assert(at == DBUS_TYPE_OBJECT_PATH);
 259         dbus_message_iter_get_basic(&sub, &id);
 260
 261         add_session(u, id);
 262
 263         dbus_message_iter_next(&sub);
 264     }
 265
 266     ret = 0;
 267
 268 fail:
 269
 270     if (m)
 271         dbus_message_unref(m);
 272
 273     if (reply)
 274         dbus_message_unref(reply);
 275
 276     dbus_error_free(&error);
 277
 278     return ret;
 279 }
 280
 281 int pa__init(pa_module*m) {
 282     DBusError error;
 283     pa_dbus_connection *connection;
 284     struct userdata *u = NULL;
 285     pa_modargs *ma;
 286
 287     pa_assert(m);
 288
 289     dbus_error_init(&error);
 290
 291     if (!(ma = pa_modargs_new(m->argument, valid_modargs))) {
 292         pa_log("Failed to parse module arguments");
 293         goto fail;
 294     }
 295
 296     if (!(connection = pa_dbus_bus_get(m->core, DBUS_BUS_SYSTEM, &error)) || dbus_error_is_set(&error)) {
 297
 298         if (connection)
 299             pa_dbus_connection_unref(connection);
 300
 301         pa_log_error("Unable to contact D-Bus system bus: %s: %s", error.name, error.message);
 302         goto fail;
 303     }
 304
 305     m->userdata = u = pa_xnew(struct userdata, 1);
 306     u->core = m->core;
 307     u->module = m;
 308     u->connection = connection;
 309     u->sessions = pa_hashmap_new(pa_idxset_string_hash_func, pa_idxset_string_compare_func);
 310
 311     if (!dbus_connection_add_filter(pa_dbus_connection_get(connection), filter_cb, u, NULL)) {
 312         pa_log_error("Failed to add filter function");
 313         goto fail;
 314     }
 315
 316     if (pa_dbus_add_matches(
 317                 pa_dbus_connection_get(connection), &error,
 318                 "type='signal',sender='org.freedesktop.ConsoleKit',interface='org.freedesktop.ConsoleKit.Seat',member='SessionAdded'",
 319                 "type='signal',sender='org.freedesktop.ConsoleKit',interface='org.freedesktop.ConsoleKit.Seat',member='SessionRemoved'", NULL) < 0) {
 320         pa_log_error("Unable to subscribe to ConsoleKit signals: %s: %s", error.name, error.message);
 321         goto fail;
 322     }
 323
 324     if (get_session_list(u) < 0)
 325         goto fail;
 326
 327     pa_modargs_free(ma);
 328
 329     return 0;
 330
 331 fail:
 332     if (ma)
 333         pa_modargs_free(ma);
 334
 335     dbus_error_free(&error);
 336     pa__done(m);
 337
 338     return -1;
 339 }
 340
 341
 342 void pa__done(pa_module *m) {
 343     struct userdata *u;
 344     struct session *session;
 345
 346     pa_assert(m);
 347
 348     if (!(u = m->userdata))
 349         return;
 350
 351     if (u->sessions) {
 352         while ((session = pa_hashmap_steal_first(u->sessions)))
 353             free_session(session);
 354
 355         pa_hashmap_free(u->sessions, NULL, NULL);
 356     }
 357
 358     if (u->connection) {
 359         pa_dbus_remove_matches(
 360                 pa_dbus_connection_get(u->connection),
 361                 "type='signal',sender='org.freedesktop.ConsoleKit',interface='org.freedesktop.ConsoleKit.Seat',member='SessionAdded'",
 362                 "type='signal',sender='org.freedesktop.ConsoleKit',interface='org.freedesktop.ConsoleKit.Seat',member='SessionRemoved'", NULL);
 363
 364         dbus_connection_remove_filter(pa_dbus_connection_get(u->connection), filter_cb, u);
 365         pa_dbus_connection_unref(u->connection);
 366     }
 367
 368     pa_xfree(u);
 369 }