gdbus/object.c

   1 /*
   2  *
   3  *  D-Bus helper library
   4  *
   5  *  Copyright (C) 2004-2011  Marcel Holtmann <marcel@holtmann.org>
   6  *
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it 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  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  21  *
  22  */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <stdio.h>
  29 #include <string.h>
  30
  31 #include <glib.h>
  32 #include <dbus/dbus.h>
  33
  34 #include "gdbus.h"
  35
  36 #define info(fmt...)
  37 #define error(fmt...)
  38 #define debug(fmt...)
  39
  40 struct generic_data {
  41         unsigned int refcount;
  42         GSList *interfaces;
  43         char *introspect;
  44 };
  45
  46 struct interface_data {
  47         char *name;
  48         const GDBusMethodTable *methods;
  49         const GDBusSignalTable *signals;
  50         const GDBusPropertyTable *properties;
  51         void *user_data;
  52         GDBusDestroyFunction destroy;
  53 };
  54
  55 struct security_data {
  56         GDBusPendingReply pending;
  57         DBusMessage *message;
  58         const GDBusMethodTable *method;
  59         void *iface_user_data;
  60 };
  61
  62 static void print_arguments(GString *gstr, const GDBusArgInfo *args,
  63                                                 const char *direction)
  64 {
  65         for (; args && args->name; args++) {
  66                 g_string_append_printf(gstr,
  67                                         "\t\t\t<arg name=\"%s\" type=\"%s\"",
  68                                         args->name, args->signature);
  69
  70                 if (direction)
  71                         g_string_append_printf(gstr,
  72                                         " direction=\"%s\"/>\n", direction);
  73                 else
  74                         g_string_append_printf(gstr, "/>\n");
  75
  76         }
  77 }
  78
  79 #define G_DBUS_ANNOTATE(prefix_, name_, value_)                         \
  80         prefix_ "<annotation name=\"org.freedesktop.DBus." name_ "\" "  \
  81         "value=\"" value_ "\"/>\n"
  82
  83 #define G_DBUS_ANNOTATE_DEPRECATED(prefix_) \
  84         G_DBUS_ANNOTATE(prefix_, "Deprecated", "true")
  85
  86 #define G_DBUS_ANNOTATE_NOREPLY(prefix_) \
  87         G_DBUS_ANNOTATE(prefix_, "Method.NoReply", "true")
  88
  89 static void generate_interface_xml(GString *gstr, struct interface_data *iface)
  90 {
  91         const GDBusMethodTable *method;
  92         const GDBusSignalTable *signal;
  93
  94         for (method = iface->methods; method && method->name; method++) {
  95                 gboolean deprecated = method->flags &
  96                                                 G_DBUS_METHOD_FLAG_DEPRECATED;
  97                 gboolean noreply = method->flags &
  98                                                 G_DBUS_METHOD_FLAG_NOREPLY;
  99
 100                 if (!deprecated && !noreply &&
 101                                 !(method->in_args && method->in_args->name) &&
 102                                 !(method->out_args && method->out_args->name))
 103                         g_string_append_printf(gstr,
 104                                                 "\t\t<method name=\"%s\"/>\n",
 105                                                 method->name);
 106                 else {
 107                         g_string_append_printf(gstr,
 108                                                 "\t\t<method name=\"%s\">\n",
 109                                                 method->name);
 110                         print_arguments(gstr, method->in_args, "in");
 111                         print_arguments(gstr, method->out_args, "out");
 112
 113                         if (deprecated)
 114                                 g_string_append_printf(gstr,
 115                                         G_DBUS_ANNOTATE_DEPRECATED("\t\t\t"));
 116                         if (noreply)
 117                                 g_string_append_printf(gstr,
 118                                         G_DBUS_ANNOTATE_NOREPLY("\t\t\t"));
 119
 120                         g_string_append_printf(gstr, "\t\t</method>\n");
 121                 }
 122         }
 123
 124         for (signal = iface->signals; signal && signal->name; signal++) {
 125                 gboolean deprecated = signal->flags &
 126                                                 G_DBUS_SIGNAL_FLAG_DEPRECATED;
 127
 128                 if (!deprecated && !(signal->args && signal->args->name))
 129                         g_string_append_printf(gstr,
 130                                                 "\t\t<signal name=\"%s\"/>\n",
 131                                                 signal->name);
 132                 else {
 133                         g_string_append_printf(gstr,
 134                                                 "\t\t<signal name=\"%s\">\n",
 135                                                 signal->name);
 136                         print_arguments(gstr, signal->args, NULL);
 137
 138                         if (deprecated)
 139                                 g_string_append_printf(gstr,
 140                                         G_DBUS_ANNOTATE_DEPRECATED("\t\t\t"));
 141
 142                         g_string_append_printf(gstr, "\t\t</signal>\n");
 143                 }
 144         }
 145 }
 146
 147 static void generate_introspection_xml(DBusConnection *conn,
 148                                 struct generic_data *data, const char *path)
 149 {
 150         GSList *list;
 151         GString *gstr;
 152         char **children;
 153         int i;
 154
 155         g_free(data->introspect);
 156
 157         gstr = g_string_new(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE);
 158
 159         g_string_append_printf(gstr, "<node>\n");
 160
 161         for (list = data->interfaces; list; list = list->next) {
 162                 struct interface_data *iface = list->data;
 163
 164                 g_string_append_printf(gstr, "\t<interface name=\"%s\">\n",
 165                                                                 iface->name);
 166
 167                 generate_interface_xml(gstr, iface);
 168
 169                 g_string_append_printf(gstr, "\t</interface>\n");
 170         }
 171
 172         if (!dbus_connection_list_registered(conn, path, &children))
 173                 goto done;
 174
 175         for (i = 0; children[i]; i++)
 176                 g_string_append_printf(gstr, "\t<node name=\"%s\"/>\n",
 177                                                                 children[i]);
 178
 179         dbus_free_string_array(children);
 180
 181 done:
 182         g_string_append_printf(gstr, "</node>\n");
 183
 184         data->introspect = g_string_free(gstr, FALSE);
 185 }
 186
 187 static DBusMessage *introspect(DBusConnection *connection,
 188                                 DBusMessage *message, void *user_data)
 189 {
 190         struct generic_data *data = user_data;
 191         DBusMessage *reply;
 192
 193         if (data->introspect == NULL)
 194                 generate_introspection_xml(connection, data,
 195                                                 dbus_message_get_path(message));
 196
 197         reply = dbus_message_new_method_return(message);
 198         if (reply == NULL)
 199                 return NULL;
 200
 201         dbus_message_append_args(reply, DBUS_TYPE_STRING, &data->introspect,
 202                                         DBUS_TYPE_INVALID);
 203
 204         return reply;
 205 }
 206
 207 static DBusHandlerResult process_message(DBusConnection *connection,
 208                         DBusMessage *message, const GDBusMethodTable *method,
 209                                                         void *iface_user_data)
 210 {
 211         DBusMessage *reply;
 212
 213         reply = method->function(connection, message, iface_user_data);
 214
 215         if (method->flags & G_DBUS_METHOD_FLAG_NOREPLY) {
 216                 if (reply != NULL)
 217                         dbus_message_unref(reply);
 218                 return DBUS_HANDLER_RESULT_HANDLED;
 219         }
 220
 221         if (method->flags & G_DBUS_METHOD_FLAG_ASYNC) {
 222                 if (reply == NULL)
 223                         return DBUS_HANDLER_RESULT_HANDLED;
 224         }
 225
 226         if (reply == NULL)
 227                 return DBUS_HANDLER_RESULT_NEED_MEMORY;
 228
 229         dbus_connection_send(connection, reply, NULL);
 230         dbus_message_unref(reply);
 231
 232         return DBUS_HANDLER_RESULT_HANDLED;
 233 }
 234
 235 static GDBusPendingReply next_pending = 1;
 236 static GSList *pending_security = NULL;
 237
 238 static const GDBusSecurityTable *security_table = NULL;
 239
 240 void g_dbus_pending_success(DBusConnection *connection,
 241                                         GDBusPendingReply pending)
 242 {
 243         GSList *list;
 244
 245         for (list = pending_security; list; list = list->next) {
 246                 struct security_data *secdata = list->data;
 247
 248                 if (secdata->pending != pending)
 249                         continue;
 250
 251                 pending_security = g_slist_remove(pending_security, secdata);
 252
 253                 process_message(connection, secdata->message,
 254                                 secdata->method, secdata->iface_user_data);
 255
 256                 dbus_message_unref(secdata->message);
 257                 g_free(secdata);
 258                 return;
 259         }
 260 }
 261
 262 void g_dbus_pending_error_valist(DBusConnection *connection,
 263                                 GDBusPendingReply pending, const char *name,
 264                                         const char *format, va_list args)
 265 {
 266         GSList *list;
 267
 268         for (list = pending_security; list; list = list->next) {
 269                 struct security_data *secdata = list->data;
 270                 DBusMessage *reply;
 271
 272                 if (secdata->pending != pending)
 273                         continue;
 274
 275                 pending_security = g_slist_remove(pending_security, secdata);
 276
 277                 reply = g_dbus_create_error_valist(secdata->message,
 278                                                         name, format, args);
 279                 if (reply != NULL) {
 280                         dbus_connection_send(connection, reply, NULL);
 281                         dbus_message_unref(reply);
 282                 }
 283
 284                 dbus_message_unref(secdata->message);
 285                 g_free(secdata);
 286                 return;
 287         }
 288 }
 289
 290 void g_dbus_pending_error(DBusConnection *connection,
 291                                 GDBusPendingReply pending,
 292                                 const char *name, const char *format, ...)
 293 {
 294         va_list args;
 295
 296         va_start(args, format);
 297
 298         g_dbus_pending_error_valist(connection, pending, name, format, args);
 299
 300         va_end(args);
 301 }
 302
 303 int polkit_check_authorization(DBusConnection *conn,
 304                                 const char *action, gboolean interaction,
 305                                 void (*function) (dbus_bool_t authorized,
 306                                                         void *user_data),
 307                                                 void *user_data, int timeout);
 308
 309 struct builtin_security_data {
 310         DBusConnection *conn;
 311         GDBusPendingReply pending;
 312 };
 313
 314 static void builtin_security_result(dbus_bool_t authorized, void *user_data)
 315 {
 316         struct builtin_security_data *data = user_data;
 317
 318         if (authorized == TRUE)
 319                 g_dbus_pending_success(data->conn, data->pending);
 320         else
 321                 g_dbus_pending_error(data->conn, data->pending,
 322                                                 DBUS_ERROR_AUTH_FAILED, NULL);
 323
 324         g_free(data);
 325 }
 326
 327 static void builtin_security_function(DBusConnection *conn,
 328                                                 const char *action,
 329                                                 gboolean interaction,
 330                                                 GDBusPendingReply pending)
 331 {
 332         struct builtin_security_data *data;
 333
 334         data = g_new0(struct builtin_security_data, 1);
 335         data->conn = conn;
 336         data->pending = pending;
 337
 338         if (polkit_check_authorization(conn, action, interaction,
 339                                 builtin_security_result, data, 30000) < 0)
 340                 g_dbus_pending_error(conn, pending, NULL, NULL);
 341 }
 342
 343 static gboolean check_privilege(DBusConnection *conn, DBusMessage *msg,
 344                         const GDBusMethodTable *method, void *iface_user_data)
 345 {
 346         const GDBusSecurityTable *security;
 347
 348         for (security = security_table; security && security->privilege;
 349                                                                 security++) {
 350                 struct security_data *secdata;
 351                 gboolean interaction;
 352
 353                 if (security->privilege != method->privilege)
 354                         continue;
 355
 356                 secdata = g_new(struct security_data, 1);
 357                 secdata->pending = next_pending++;
 358                 secdata->message = dbus_message_ref(msg);
 359                 secdata->method = method;
 360                 secdata->iface_user_data = iface_user_data;
 361
 362                 pending_security = g_slist_prepend(pending_security, secdata);
 363
 364                 if (security->flags & G_DBUS_SECURITY_FLAG_ALLOW_INTERACTION)
 365                         interaction = TRUE;
 366                 else
 367                         interaction = FALSE;
 368
 369                 if (!(security->flags & G_DBUS_SECURITY_FLAG_BUILTIN) &&
 370                                                         security->function)
 371                         security->function(conn, security->action,
 372                                                 interaction, secdata->pending);
 373                 else
 374                         builtin_security_function(conn, security->action,
 375                                                 interaction, secdata->pending);
 376
 377                 return TRUE;
 378         }
 379
 380         return FALSE;
 381 }
 382
 383 static void generic_unregister(DBusConnection *connection, void *user_data)
 384 {
 385         struct generic_data *data = user_data;
 386
 387         g_free(data->introspect);
 388         g_free(data);
 389 }
 390
 391 static struct interface_data *find_interface(GSList *interfaces,
 392                                                 const char *name)
 393 {
 394         GSList *list;
 395
 396         if (name == NULL)
 397                 return NULL;
 398
 399         for (list = interfaces; list; list = list->next) {
 400                 struct interface_data *iface = list->data;
 401                 if (!strcmp(name, iface->name))
 402                         return iface;
 403         }
 404
 405         return NULL;
 406 }
 407
 408 static gboolean g_dbus_args_have_signature(const GDBusArgInfo *args,
 409                                                         DBusMessage *message)
 410 {
 411         const char *sig = dbus_message_get_signature(message);
 412         const char *p = NULL;
 413
 414         for (; args && args->signature && *sig; args++) {
 415                 p = args->signature;
 416
 417                 for (; *sig && *p; sig++, p++) {
 418                         if (*p != *sig)
 419                                 return FALSE;
 420                 }
 421         }
 422
 423         if (*sig || (p && *p) || (args && args->signature))
 424                 return FALSE;
 425
 426         return TRUE;
 427 }
 428
 429 static DBusHandlerResult generic_message(DBusConnection *connection,
 430                                         DBusMessage *message, void *user_data)
 431 {
 432         struct generic_data *data = user_data;
 433         struct interface_data *iface;
 434         const GDBusMethodTable *method;
 435         const char *interface;
 436
 437         interface = dbus_message_get_interface(message);
 438
 439         iface = find_interface(data->interfaces, interface);
 440         if (iface == NULL)
 441                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 442
 443         for (method = iface->methods; method &&
 444                         method->name && method->function; method++) {
 445                 if (dbus_message_is_method_call(message, iface->name,
 446                                                         method->name) == FALSE)
 447                         continue;
 448
 449                 if (g_dbus_args_have_signature(method->in_args,
 450                                                         message) == FALSE)
 451                         continue;
 452
 453                 if (check_privilege(connection, message, method,
 454                                                 iface->user_data) == TRUE)
 455                         return DBUS_HANDLER_RESULT_HANDLED;
 456
 457                 return process_message(connection, message, method,
 458                                                         iface->user_data);
 459         }
 460
 461         return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 462 }
 463
 464 static DBusObjectPathVTable generic_table = {
 465         .unregister_function    = generic_unregister,
 466         .message_function       = generic_message,
 467 };
 468
 469 static void invalidate_parent_data(DBusConnection *conn, const char *child_path)
 470 {
 471         struct generic_data *data = NULL;
 472         char *parent_path, *slash;
 473
 474         parent_path = g_strdup(child_path);
 475         slash = strrchr(parent_path, '/');
 476         if (slash == NULL)
 477                 goto done;
 478
 479         if (slash == parent_path && parent_path[1] != '\0')
 480                 parent_path[1] = '\0';
 481         else
 482                 *slash = '\0';
 483
 484         if (!strlen(parent_path))
 485                 goto done;
 486
 487         if (dbus_connection_get_object_path_data(conn, parent_path,
 488                                                         (void *) &data) == FALSE) {
 489                 goto done;
 490         }
 491
 492         invalidate_parent_data(conn, parent_path);
 493
 494         if (data == NULL)
 495                 goto done;
 496
 497         g_free(data->introspect);
 498         data->introspect = NULL;
 499
 500 done:
 501         g_free(parent_path);
 502 }
 503
 504 static const GDBusMethodTable introspect_methods[] = {
 505         { GDBUS_METHOD("Introspect", NULL,
 506                         GDBUS_ARGS({ "xml", "s" }), introspect) },
 507         { }
 508 };
 509
 510 static inline const GDBusPropertyTable *find_property(const GDBusPropertyTable *properties,
 511                                                         const char *name)
 512 {
 513         const GDBusPropertyTable *p;
 514
 515         for (p = properties; p && p->name; p++) {
 516                 if (strcmp(name, p->name) == 0)
 517                         return p;
 518         }
 519
 520         return NULL;
 521 }
 522
 523 static DBusMessage *properties_get(DBusConnection *connection,
 524                                         DBusMessage *message, void *user_data)
 525 {
 526         struct generic_data *data = user_data;
 527         struct interface_data *iface;
 528         const GDBusPropertyTable *property;
 529         const char *interface, *name;
 530         DBusMessageIter iter, value;
 531         DBusMessage *reply;
 532
 533         if (!dbus_message_get_args(message, NULL,
 534                                         DBUS_TYPE_STRING, &interface,
 535                                         DBUS_TYPE_STRING, &name,
 536                                         DBUS_TYPE_INVALID))
 537                 return NULL;
 538
 539         iface = find_interface(data->interfaces, interface);
 540         if (iface == NULL)
 541                 return g_dbus_create_error(message, DBUS_ERROR_INVALID_ARGS,
 542                                 "No such interface '%s'", interface);
 543
 544         property = find_property(iface->properties, name);
 545         if (property == NULL)
 546                 return g_dbus_create_error(message, DBUS_ERROR_INVALID_ARGS,
 547                                 "No such property '%s'", name);
 548
 549         if (property->exists != NULL &&
 550                         !property->exists(property, iface->user_data))
 551                 return g_dbus_create_error(message, DBUS_ERROR_INVALID_ARGS,
 552                                         "No such property '%s'", name);
 553
 554         if (property->get == NULL)
 555                 return g_dbus_create_error(message, DBUS_ERROR_INVALID_ARGS,
 556                                 "Property '%s' is not readable", name);
 557
 558         reply = dbus_message_new_method_return(message);
 559         if (reply == NULL)
 560                 return NULL;
 561
 562         dbus_message_iter_init_append(reply, &iter);
 563         dbus_message_iter_open_container(&iter, DBUS_TYPE_VARIANT,
 564                                                 property->type, &value);
 565
 566         if (!property->get(property, &value, iface->user_data)) {
 567                 dbus_message_unref(reply);
 568                 return NULL;
 569         }
 570
 571         dbus_message_iter_close_container(&iter, &value);
 572
 573         return reply;
 574 }
 575
 576 static DBusMessage *properties_get_all(DBusConnection *connection,
 577                                         DBusMessage *message, void *user_data)
 578 {
 579         return NULL;
 580 }
 581
 582 static DBusMessage *properties_set(DBusConnection *connection,
 583                                         DBusMessage *message, void *user_data)
 584 {
 585         return dbus_message_new_method_return(message);
 586 }
 587
 588 static const GDBusMethodTable properties_methods[] = {
 589         { GDBUS_METHOD("Get",
 590                         GDBUS_ARGS({ "interface", "s" }, { "name", "s" }),
 591                         GDBUS_ARGS({ "value", "v" }),
 592                         properties_get) },
 593         { GDBUS_ASYNC_METHOD("Set", NULL,
 594                         GDBUS_ARGS({ "interface", "s" }, { "name", "s" },
 595                                                         { "value", "v" }),
 596                         properties_set) },
 597         { GDBUS_METHOD("GetAll",
 598                         GDBUS_ARGS({ "interface", "s" }),
 599                         GDBUS_ARGS({ "properties", "a{sv}" }),
 600                         properties_get_all) },
 601         { }
 602 };
 603
 604 static const GDBusSignalTable properties_signals[] = {
 605         { GDBUS_SIGNAL("PropertiesChanged",
 606                         GDBUS_ARGS({ "interface", "s" },
 607                                         { "changed_properties", "a{sv}" },
 608                                         { "invalidated_properties", "as"})) },
 609         { }
 610 };
 611
 612 static void add_interface(struct generic_data *data, const char *name,
 613                                 const GDBusMethodTable *methods,
 614                                 const GDBusSignalTable *signals,
 615                                 const GDBusPropertyTable *properties,
 616                                 void *user_data,
 617                                 GDBusDestroyFunction destroy)
 618 {
 619         struct interface_data *iface;
 620
 621         iface = g_new0(struct interface_data, 1);
 622         iface->name = g_strdup(name);
 623         iface->methods = methods;
 624         iface->signals = signals;
 625         iface->properties = properties;
 626         iface->user_data = user_data;
 627         iface->destroy = destroy;
 628
 629         data->interfaces = g_slist_append(data->interfaces, iface);
 630 }
 631
 632 static struct generic_data *object_path_ref(DBusConnection *connection,
 633                                                         const char *path)
 634 {
 635         struct generic_data *data;
 636
 637         if (dbus_connection_get_object_path_data(connection, path,
 638                                                 (void *) &data) == TRUE) {
 639                 if (data != NULL) {
 640                         data->refcount++;
 641                         return data;
 642                 }
 643         }
 644
 645         data = g_new0(struct generic_data, 1);
 646         data->refcount = 1;
 647
 648         data->introspect = g_strdup(DBUS_INTROSPECT_1_0_XML_DOCTYPE_DECL_NODE "<node></node>");
 649
 650         if (!dbus_connection_register_object_path(connection, path,
 651                                                 &generic_table, data)) {
 652                 g_free(data->introspect);
 653                 g_free(data);
 654                 return NULL;
 655         }
 656
 657         invalidate_parent_data(connection, path);
 658
 659         add_interface(data, DBUS_INTERFACE_INTROSPECTABLE,
 660                         introspect_methods, NULL, NULL, data, NULL);
 661
 662         add_interface(data, DBUS_INTERFACE_PROPERTIES, properties_methods,
 663                                         properties_signals, NULL, data, NULL);
 664
 665         return data;
 666 }
 667
 668 static gboolean remove_interface(struct generic_data *data, const char *name)
 669 {
 670         struct interface_data *iface;
 671
 672         iface = find_interface(data->interfaces, name);
 673         if (iface == NULL)
 674                 return FALSE;
 675
 676         data->interfaces = g_slist_remove(data->interfaces, iface);
 677
 678         if (iface->destroy)
 679                 iface->destroy(iface->user_data);
 680
 681         g_free(iface->name);
 682         g_free(iface);
 683
 684         return TRUE;
 685 }
 686
 687 static void object_path_unref(DBusConnection *connection, const char *path)
 688 {
 689         struct generic_data *data = NULL;
 690
 691         if (dbus_connection_get_object_path_data(connection, path,
 692                                                 (void *) &data) == FALSE)
 693                 return;
 694
 695         if (data == NULL)
 696                 return;
 697
 698         data->refcount--;
 699
 700         if (data->refcount > 0)
 701                 return;
 702
 703         remove_interface(data, DBUS_INTERFACE_INTROSPECTABLE);
 704         remove_interface(data, DBUS_INTERFACE_PROPERTIES);
 705
 706         invalidate_parent_data(connection, path);
 707
 708         dbus_connection_unregister_object_path(connection, path);
 709 }
 710
 711 static gboolean check_signal(DBusConnection *conn, const char *path,
 712                                 const char *interface, const char *name,
 713                                 const GDBusArgInfo **args)
 714 {
 715         struct generic_data *data = NULL;
 716         struct interface_data *iface;
 717         const GDBusSignalTable *signal;
 718
 719         *args = NULL;
 720         if (!dbus_connection_get_object_path_data(conn, path,
 721                                         (void *) &data) || data == NULL) {
 722                 error("dbus_connection_emit_signal: path %s isn't registered",
 723                                 path);
 724                 return FALSE;
 725         }
 726
 727         iface = find_interface(data->interfaces, interface);
 728         if (iface == NULL) {
 729                 error("dbus_connection_emit_signal: %s does not implement %s",
 730                                 path, interface);
 731                 return FALSE;
 732         }
 733
 734         for (signal = iface->signals; signal && signal->name; signal++) {
 735                 if (!strcmp(signal->name, name)) {
 736                         *args = signal->args;
 737                         return TRUE;
 738                 }
 739         }
 740
 741         error("No signal named %s on interface %s", name, interface);
 742         return FALSE;
 743 }
 744
 745 static dbus_bool_t emit_signal_valist(DBusConnection *conn,
 746                                                 const char *path,
 747                                                 const char *interface,
 748                                                 const char *name,
 749                                                 int first,
 750                                                 va_list var_args)
 751 {
 752         DBusMessage *signal;
 753         dbus_bool_t ret;
 754         const GDBusArgInfo *args;
 755
 756         if (!check_signal(conn, path, interface, name, &args))
 757                 return FALSE;
 758
 759         signal = dbus_message_new_signal(path, interface, name);
 760         if (signal == NULL) {
 761                 error("Unable to allocate new %s.%s signal", interface,  name);
 762                 return FALSE;
 763         }
 764
 765         ret = dbus_message_append_args_valist(signal, first, var_args);
 766         if (!ret)
 767                 goto fail;
 768
 769         if (g_dbus_args_have_signature(args, signal) == FALSE) {
 770                 error("%s.%s: got unexpected signature '%s'", interface, name,
 771                                         dbus_message_get_signature(signal));
 772                 ret = FALSE;
 773                 goto fail;
 774         }
 775
 776         ret = dbus_connection_send(conn, signal, NULL);
 777
 778 fail:
 779         dbus_message_unref(signal);
 780
 781         return ret;
 782 }
 783
 784 gboolean g_dbus_register_interface(DBusConnection *connection,
 785                                         const char *path, const char *name,
 786                                         const GDBusMethodTable *methods,
 787                                         const GDBusSignalTable *signals,
 788                                         const GDBusPropertyTable *properties,
 789                                         void *user_data,
 790                                         GDBusDestroyFunction destroy)
 791 {
 792         struct generic_data *data;
 793
 794         data = object_path_ref(connection, path);
 795         if (data == NULL)
 796                 return FALSE;
 797
 798         if (find_interface(data->interfaces, name)) {
 799                 object_path_unref(connection, path);
 800                 return FALSE;
 801         }
 802
 803         add_interface(data, name, methods, signals,
 804                         properties, user_data, destroy);
 805
 806         g_free(data->introspect);
 807         data->introspect = NULL;
 808
 809         return TRUE;
 810 }
 811
 812 gboolean g_dbus_unregister_interface(DBusConnection *connection,
 813                                         const char *path, const char *name)
 814 {
 815         struct generic_data *data = NULL;
 816
 817         if (path == NULL)
 818                 return FALSE;
 819
 820         if (dbus_connection_get_object_path_data(connection, path,
 821                                                 (void *) &data) == FALSE)
 822                 return FALSE;
 823
 824         if (data == NULL)
 825                 return FALSE;
 826
 827         if (remove_interface(data, name) == FALSE)
 828                 return FALSE;
 829
 830         g_free(data->introspect);
 831         data->introspect = NULL;
 832
 833         object_path_unref(connection, path);
 834
 835         return TRUE;
 836 }
 837
 838 gboolean g_dbus_register_security(const GDBusSecurityTable *security)
 839 {
 840         if (security_table != NULL)
 841                 return FALSE;
 842
 843         security_table = security;
 844
 845         return TRUE;
 846 }
 847
 848 gboolean g_dbus_unregister_security(const GDBusSecurityTable *security)
 849 {
 850         security_table = NULL;
 851
 852         return TRUE;
 853 }
 854
 855 DBusMessage *g_dbus_create_error_valist(DBusMessage *message, const char *name,
 856                                         const char *format, va_list args)
 857 {
 858         char str[1024];
 859
 860         vsnprintf(str, sizeof(str), format, args);
 861
 862         return dbus_message_new_error(message, name, str);
 863 }
 864
 865 DBusMessage *g_dbus_create_error(DBusMessage *message, const char *name,
 866                                                 const char *format, ...)
 867 {
 868         va_list args;
 869         DBusMessage *reply;
 870
 871         va_start(args, format);
 872
 873         reply = g_dbus_create_error_valist(message, name, format, args);
 874
 875         va_end(args);
 876
 877         return reply;
 878 }
 879
 880 DBusMessage *g_dbus_create_reply_valist(DBusMessage *message,
 881                                                 int type, va_list args)
 882 {
 883         DBusMessage *reply;
 884
 885         reply = dbus_message_new_method_return(message);
 886         if (reply == NULL)
 887                 return NULL;
 888
 889         if (dbus_message_append_args_valist(reply, type, args) == FALSE) {
 890                 dbus_message_unref(reply);
 891                 return NULL;
 892         }
 893
 894         return reply;
 895 }
 896
 897 DBusMessage *g_dbus_create_reply(DBusMessage *message, int type, ...)
 898 {
 899         va_list args;
 900         DBusMessage *reply;
 901
 902         va_start(args, type);
 903
 904         reply = g_dbus_create_reply_valist(message, type, args);
 905
 906         va_end(args);
 907
 908         return reply;
 909 }
 910
 911 gboolean g_dbus_send_message(DBusConnection *connection, DBusMessage *message)
 912 {
 913         dbus_bool_t result;
 914
 915         if (dbus_message_get_type(message) == DBUS_MESSAGE_TYPE_METHOD_CALL)
 916                 dbus_message_set_no_reply(message, TRUE);
 917
 918         result = dbus_connection_send(connection, message, NULL);
 919
 920         dbus_message_unref(message);
 921
 922         return result;
 923 }
 924
 925 gboolean g_dbus_send_reply_valist(DBusConnection *connection,
 926                                 DBusMessage *message, int type, va_list args)
 927 {
 928         DBusMessage *reply;
 929
 930         reply = dbus_message_new_method_return(message);
 931         if (reply == NULL)
 932                 return FALSE;
 933
 934         if (dbus_message_append_args_valist(reply, type, args) == FALSE) {
 935                 dbus_message_unref(reply);
 936                 return FALSE;
 937         }
 938
 939         return g_dbus_send_message(connection, reply);
 940 }
 941
 942 gboolean g_dbus_send_reply(DBusConnection *connection,
 943                                 DBusMessage *message, int type, ...)
 944 {
 945         va_list args;
 946         gboolean result;
 947
 948         va_start(args, type);
 949
 950         result = g_dbus_send_reply_valist(connection, message, type, args);
 951
 952         va_end(args);
 953
 954         return result;
 955 }
 956
 957 gboolean g_dbus_emit_signal(DBusConnection *connection,
 958                                 const char *path, const char *interface,
 959                                 const char *name, int type, ...)
 960 {
 961         va_list args;
 962         gboolean result;
 963
 964         va_start(args, type);
 965
 966         result = emit_signal_valist(connection, path, interface,
 967                                                         name, type, args);
 968
 969         va_end(args);
 970
 971         return result;
 972 }
 973
 974 gboolean g_dbus_emit_signal_valist(DBusConnection *connection,
 975                                 const char *path, const char *interface,
 976                                 const char *name, int type, va_list args)
 977 {
 978         return emit_signal_valist(connection, path, interface,
 979                                                         name, type, args);
 980 }