libeap/wpa_supplicant/dbus/dbus_new_helpers.c

   1 /*
   2  * WPA Supplicant / dbus-based control interface
   3  * Copyright (c) 2006, Dan Williams <dcbw@redhat.com> and Red Hat, Inc.
   4  * Copyright (c) 2009, Witold Sowa <witold.sowa@gmail.com>
   5  *
   6  * This software may be distributed under the terms of the BSD license.
   7  * See README for more details.
   8  */
   9
  10 #include "utils/includes.h"
  11
  12 #include "utils/common.h"
  13 #include "utils/eloop.h"
  14 #include "dbus_common.h"
  15 #include "dbus_common_i.h"
  16 #include "dbus_new.h"
  17 #include "dbus_new_helpers.h"
  18 #include "dbus_new_handlers.h"
  19 #include "dbus_dict_helpers.h"
  20
  21
  22 static dbus_bool_t fill_dict_with_properties(
  23         DBusMessageIter *dict_iter,
  24         const struct wpa_dbus_property_desc *props,
  25         const char *interface, void *user_data, DBusError *error)
  26 {
  27         DBusMessageIter entry_iter;
  28         const struct wpa_dbus_property_desc *dsc;
  29
  30         for (dsc = props; dsc && dsc->dbus_property; dsc++) {
  31                 /* Only return properties for the requested D-Bus interface */
  32                 if (os_strncmp(dsc->dbus_interface, interface,
  33                                WPAS_DBUS_INTERFACE_MAX) != 0)
  34                         continue;
  35
  36                 /* Skip write-only properties */
  37                 if (dsc->getter == NULL)
  38                         continue;
  39
  40                 if (!dbus_message_iter_open_container(dict_iter,
  41                                                       DBUS_TYPE_DICT_ENTRY,
  42                                                       NULL, &entry_iter) ||
  43                     !dbus_message_iter_append_basic(&entry_iter,
  44                                                     DBUS_TYPE_STRING,
  45                                                     &dsc->dbus_property))
  46                         goto error;
  47
  48                 /* An error getting a property fails the request entirely */
  49                 if (!dsc->getter(&entry_iter, error, user_data)) {
  50                         wpa_printf(MSG_INFO,
  51                                    "dbus: %s dbus_interface=%s dbus_property=%s getter failed",
  52                                    __func__, dsc->dbus_interface,
  53                                    dsc->dbus_property);
  54                         return FALSE;
  55                 }
  56
  57                 if (!dbus_message_iter_close_container(dict_iter, &entry_iter))
  58                         goto error;
  59         }
  60
  61         return TRUE;
  62
  63 error:
  64         dbus_set_error_const(error, DBUS_ERROR_NO_MEMORY, "no memory");
  65         return FALSE;
  66 }
  67
  68
  69 /**
  70  * get_all_properties - Responds for GetAll properties calls on object
  71  * @message: Message with GetAll call
  72  * @interface: interface name which properties will be returned
  73  * @property_dsc: list of object's properties
  74  * Returns: Message with dict of variants as argument with properties values
  75  *
  76  * Iterates over all properties registered with object and execute getters
  77  * of those, which are readable and which interface matches interface
  78  * specified as argument. Returned message contains one dict argument
  79  * with properties names as keys and theirs values as values.
  80  */
  81 static DBusMessage * get_all_properties(DBusMessage *message, char *interface,
  82                                         struct wpa_dbus_object_desc *obj_dsc)
  83 {
  84         DBusMessage *reply;
  85         DBusMessageIter iter, dict_iter;
  86         DBusError error;
  87
  88         reply = dbus_message_new_method_return(message);
  89         if (reply == NULL)
  90                 return wpas_dbus_error_no_memory(message);
  91
  92         dbus_message_iter_init_append(reply, &iter);
  93         if (!wpa_dbus_dict_open_write(&iter, &dict_iter)) {
  94                 dbus_message_unref(reply);
  95                 return wpas_dbus_error_no_memory(message);
  96         }
  97
  98         dbus_error_init(&error);
  99         if (!fill_dict_with_properties(&dict_iter, obj_dsc->properties,
 100                                        interface, obj_dsc->user_data, &error)) {
 101                 dbus_message_unref(reply);
 102                 reply = wpas_dbus_reply_new_from_error(
 103                         message, &error, DBUS_ERROR_INVALID_ARGS,
 104                         "No readable properties in this interface");
 105                 dbus_error_free(&error);
 106                 return reply;
 107         }
 108
 109         if (!wpa_dbus_dict_close_write(&iter, &dict_iter)) {
 110                 dbus_message_unref(reply);
 111                 return wpas_dbus_error_no_memory(message);
 112         }
 113
 114         return reply;
 115 }
 116
 117
 118 static int is_signature_correct(DBusMessage *message,
 119                                 const struct wpa_dbus_method_desc *method_dsc)
 120 {
 121         /* According to DBus documentation max length of signature is 255 */
 122 #define MAX_SIG_LEN 256
 123         char registered_sig[MAX_SIG_LEN], *pos;
 124         const char *sig = dbus_message_get_signature(message);
 125         int ret;
 126         const struct wpa_dbus_argument *arg;
 127
 128         pos = registered_sig;
 129         *pos = '\0';
 130
 131         for (arg = method_dsc->args; arg && arg->name; arg++) {
 132                 if (arg->dir == ARG_IN) {
 133                         size_t blen = registered_sig + MAX_SIG_LEN - pos;
 134
 135                         ret = os_snprintf(pos, blen, "%s", arg->type);
 136                         if (os_snprintf_error(blen, ret))
 137                                 return 0;
 138                         pos += ret;
 139                 }
 140         }
 141
 142         return !os_strncmp(registered_sig, sig, MAX_SIG_LEN);
 143 }
 144
 145
 146 static DBusMessage * properties_get_all(DBusMessage *message, char *interface,
 147                                         struct wpa_dbus_object_desc *obj_dsc)
 148 {
 149         if (os_strcmp(dbus_message_get_signature(message), "s") != 0)
 150                 return dbus_message_new_error(message, DBUS_ERROR_INVALID_ARGS,
 151                                               NULL);
 152
 153         return get_all_properties(message, interface, obj_dsc);
 154 }
 155
 156
 157 static DBusMessage * properties_get(DBusMessage *message,
 158                                     const struct wpa_dbus_property_desc *dsc,
 159                                     void *user_data)
 160 {
 161         DBusMessage *reply;
 162         DBusMessageIter iter;
 163         DBusError error;
 164
 165         if (os_strcmp(dbus_message_get_signature(message), "ss")) {
 166                 return dbus_message_new_error(message, DBUS_ERROR_INVALID_ARGS,
 167                                               NULL);
 168         }
 169
 170         if (dsc->getter == NULL) {
 171                 return dbus_message_new_error(message, DBUS_ERROR_INVALID_ARGS,
 172                                               "Property is write-only");
 173         }
 174
 175         reply = dbus_message_new_method_return(message);
 176         dbus_message_iter_init_append(reply, &iter);
 177
 178         dbus_error_init(&error);
 179         if (dsc->getter(&iter, &error, user_data) == FALSE) {
 180                 dbus_message_unref(reply);
 181                 reply = wpas_dbus_reply_new_from_error(
 182                         message, &error, DBUS_ERROR_FAILED,
 183                         "Failed to read property");
 184                 dbus_error_free(&error);
 185         }
 186
 187         return reply;
 188 }
 189
 190
 191 static DBusMessage * properties_set(DBusMessage *message,
 192                                     const struct wpa_dbus_property_desc *dsc,
 193                                     void *user_data)
 194 {
 195         DBusMessage *reply;
 196         DBusMessageIter iter;
 197         DBusError error;
 198
 199         if (os_strcmp(dbus_message_get_signature(message), "ssv")) {
 200                 return dbus_message_new_error(message, DBUS_ERROR_INVALID_ARGS,
 201                                               NULL);
 202         }
 203
 204         if (dsc->setter == NULL) {
 205                 return dbus_message_new_error(message, DBUS_ERROR_INVALID_ARGS,
 206                                               "Property is read-only");
 207         }
 208
 209         dbus_message_iter_init(message, &iter);
 210         /* Skip the interface name and the property name */
 211         dbus_message_iter_next(&iter);
 212         dbus_message_iter_next(&iter);
 213
 214         /* Iter will now point to the property's new value */
 215         dbus_error_init(&error);
 216         if (dsc->setter(&iter, &error, user_data) == TRUE) {
 217                 /* Success */
 218                 reply = dbus_message_new_method_return(message);
 219         } else {
 220                 reply = wpas_dbus_reply_new_from_error(
 221                         message, &error, DBUS_ERROR_FAILED,
 222                         "Failed to set property");
 223                 dbus_error_free(&error);
 224         }
 225
 226         return reply;
 227 }
 228
 229
 230 static DBusMessage *
 231 properties_get_or_set(DBusMessage *message, DBusMessageIter *iter,
 232                       char *interface,
 233                       struct wpa_dbus_object_desc *obj_dsc)
 234 {
 235         const struct wpa_dbus_property_desc *property_dsc;
 236         char *property;
 237         const char *method;
 238
 239         method = dbus_message_get_member(message);
 240         property_dsc = obj_dsc->properties;
 241
 242         /* Second argument: property name (DBUS_TYPE_STRING) */
 243         if (!dbus_message_iter_next(iter) ||
 244             dbus_message_iter_get_arg_type(iter) != DBUS_TYPE_STRING) {
 245                 return dbus_message_new_error(message, DBUS_ERROR_INVALID_ARGS,
 246                                               NULL);
 247         }
 248         dbus_message_iter_get_basic(iter, &property);
 249
 250         while (property_dsc && property_dsc->dbus_property) {
 251                 /* compare property names and
 252                  * interfaces */
 253                 if (!os_strncmp(property_dsc->dbus_property, property,
 254                                 WPAS_DBUS_METHOD_SIGNAL_PROP_MAX) &&
 255                     !os_strncmp(property_dsc->dbus_interface, interface,
 256                                 WPAS_DBUS_INTERFACE_MAX))
 257                         break;
 258
 259                 property_dsc++;
 260         }
 261         if (property_dsc == NULL || property_dsc->dbus_property == NULL) {
 262                 wpa_printf(MSG_DEBUG, "no property handler for %s.%s on %s",
 263                            interface, property,
 264                            dbus_message_get_path(message));
 265                 return dbus_message_new_error(message, DBUS_ERROR_INVALID_ARGS,
 266                                               "No such property");
 267         }
 268
 269         if (os_strncmp(WPA_DBUS_PROPERTIES_GET, method,
 270                        WPAS_DBUS_METHOD_SIGNAL_PROP_MAX) == 0) {
 271                 wpa_printf(MSG_MSGDUMP, "%s: Get(%s)", __func__, property);
 272                 return properties_get(message, property_dsc,
 273                                       obj_dsc->user_data);
 274         }
 275
 276         wpa_printf(MSG_MSGDUMP, "%s: Set(%s)", __func__, property);
 277         return properties_set(message, property_dsc, obj_dsc->user_data);
 278 }
 279
 280
 281 static DBusMessage * properties_handler(DBusMessage *message,
 282                                         struct wpa_dbus_object_desc *obj_dsc)
 283 {
 284         DBusMessageIter iter;
 285         char *interface;
 286         const char *method;
 287
 288         method = dbus_message_get_member(message);
 289         dbus_message_iter_init(message, &iter);
 290
 291         if (!os_strncmp(WPA_DBUS_PROPERTIES_GET, method,
 292                         WPAS_DBUS_METHOD_SIGNAL_PROP_MAX) ||
 293             !os_strncmp(WPA_DBUS_PROPERTIES_SET, method,
 294                         WPAS_DBUS_METHOD_SIGNAL_PROP_MAX) ||
 295             !os_strncmp(WPA_DBUS_PROPERTIES_GETALL, method,
 296                         WPAS_DBUS_METHOD_SIGNAL_PROP_MAX)) {
 297                 /* First argument: interface name (DBUS_TYPE_STRING) */
 298                 if (dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_STRING) {
 299                         return dbus_message_new_error(message,
 300                                                       DBUS_ERROR_INVALID_ARGS,
 301                                                       NULL);
 302                 }
 303
 304                 dbus_message_iter_get_basic(&iter, &interface);
 305
 306                 if (!os_strncmp(WPA_DBUS_PROPERTIES_GETALL, method,
 307                                 WPAS_DBUS_METHOD_SIGNAL_PROP_MAX)) {
 308                         /* GetAll */
 309                         return properties_get_all(message, interface, obj_dsc);
 310                 }
 311                 /* Get or Set */
 312                 return properties_get_or_set(message, &iter, interface,
 313                                              obj_dsc);
 314         }
 315         return dbus_message_new_error(message, DBUS_ERROR_UNKNOWN_METHOD,
 316                                       NULL);
 317 }
 318
 319
 320 static DBusMessage * msg_method_handler(DBusMessage *message,
 321                                         struct wpa_dbus_object_desc *obj_dsc)
 322 {
 323         const struct wpa_dbus_method_desc *method_dsc = obj_dsc->methods;
 324         const char *method;
 325         const char *msg_interface;
 326
 327         method = dbus_message_get_member(message);
 328         msg_interface = dbus_message_get_interface(message);
 329
 330         /* try match call to any registered method */
 331         while (method_dsc && method_dsc->dbus_method) {
 332                 /* compare method names and interfaces */
 333                 if (!os_strncmp(method_dsc->dbus_method, method,
 334                                 WPAS_DBUS_METHOD_SIGNAL_PROP_MAX) &&
 335                     !os_strncmp(method_dsc->dbus_interface, msg_interface,
 336                                 WPAS_DBUS_INTERFACE_MAX))
 337                         break;
 338
 339                 method_dsc++;
 340         }
 341         if (method_dsc == NULL || method_dsc->dbus_method == NULL) {
 342                 wpa_printf(MSG_DEBUG, "no method handler for %s.%s on %s",
 343                            msg_interface, method,
 344                            dbus_message_get_path(message));
 345                 return dbus_message_new_error(message,
 346                                               DBUS_ERROR_UNKNOWN_METHOD, NULL);
 347         }
 348
 349         if (!is_signature_correct(message, method_dsc)) {
 350                 return dbus_message_new_error(message, DBUS_ERROR_INVALID_ARGS,
 351                                               NULL);
 352         }
 353
 354         return method_dsc->method_handler(message, obj_dsc->user_data);
 355 }
 356
 357
 358 /**
 359  * message_handler - Handles incoming DBus messages
 360  * @connection: DBus connection on which message was received
 361  * @message: Received message
 362  * @user_data: pointer to description of object to which message was sent
 363  * Returns: Returns information whether message was handled or not
 364  *
 365  * Reads message interface and method name, then checks if they matches one
 366  * of the special cases i.e. introspection call or properties get/getall/set
 367  * methods and handles it. Else it iterates over registered methods list
 368  * and tries to match method's name and interface to those read from message
 369  * If appropriate method was found its handler function is called and
 370  * response is sent. Otherwise, the DBUS_ERROR_UNKNOWN_METHOD error message
 371  * will be sent.
 372  */
 373 static DBusHandlerResult message_handler(DBusConnection *connection,
 374                                          DBusMessage *message, void *user_data)
 375 {
 376         struct wpa_dbus_object_desc *obj_dsc = user_data;
 377         const char *method;
 378         const char *path;
 379         const char *msg_interface;
 380         DBusMessage *reply;
 381
 382         /* get method, interface and path the message is addressed to */
 383         method = dbus_message_get_member(message);
 384         path = dbus_message_get_path(message);
 385         msg_interface = dbus_message_get_interface(message);
 386         if (!method || !path || !msg_interface)
 387                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 388
 389         wpa_printf(MSG_MSGDUMP, "dbus: %s.%s (%s) [%s]",
 390                    msg_interface, method, path,
 391                    dbus_message_get_signature(message));
 392
 393         /* if message is introspection method call */
 394         if (!os_strncmp(WPA_DBUS_INTROSPECTION_METHOD, method,
 395                         WPAS_DBUS_METHOD_SIGNAL_PROP_MAX) &&
 396             !os_strncmp(WPA_DBUS_INTROSPECTION_INTERFACE, msg_interface,
 397                         WPAS_DBUS_INTERFACE_MAX)) {
 398 #ifdef CONFIG_CTRL_IFACE_DBUS_INTRO
 399                 reply = wpa_dbus_introspect(message, obj_dsc);
 400 #else /* CONFIG_CTRL_IFACE_DBUS_INTRO */
 401                 reply = dbus_message_new_error(
 402                         message, DBUS_ERROR_UNKNOWN_METHOD,
 403                         "wpa_supplicant was compiled without introspection support.");
 404 #endif /* CONFIG_CTRL_IFACE_DBUS_INTRO */
 405         } else if (!os_strncmp(WPA_DBUS_PROPERTIES_INTERFACE, msg_interface,
 406                              WPAS_DBUS_INTERFACE_MAX)) {
 407                 /* if message is properties method call */
 408                 reply = properties_handler(message, obj_dsc);
 409         } else {
 410                 reply = msg_method_handler(message, obj_dsc);
 411         }
 412
 413         /* If handler succeed returning NULL, reply empty message */
 414         if (!reply)
 415                 reply = dbus_message_new_method_return(message);
 416         if (reply) {
 417                 if (!dbus_message_get_no_reply(message))
 418                         dbus_connection_send(connection, reply, NULL);
 419                 dbus_message_unref(reply);
 420         }
 421
 422         wpa_dbus_flush_all_changed_properties(connection);
 423
 424         return DBUS_HANDLER_RESULT_HANDLED;
 425 }
 426
 427
 428 /**
 429  * free_dbus_object_desc - Frees object description data structure
 430  * @connection: DBus connection
 431  * @obj_dsc: Object description to free
 432  *
 433  * Frees each of properties, methods and signals description lists and
 434  * the object description structure itself.
 435  */
 436 void free_dbus_object_desc(struct wpa_dbus_object_desc *obj_dsc)
 437 {
 438         if (!obj_dsc)
 439                 return;
 440
 441         /* free handler's argument */
 442         if (obj_dsc->user_data_free_func)
 443                 obj_dsc->user_data_free_func(obj_dsc->user_data);
 444
 445         os_free(obj_dsc->path);
 446         os_free(obj_dsc->prop_changed_flags);
 447         os_free(obj_dsc);
 448 }
 449
 450
 451 static void free_dbus_object_desc_cb(DBusConnection *connection, void *obj_dsc)
 452 {
 453         free_dbus_object_desc(obj_dsc);
 454 }
 455
 456
 457 /**
 458  * wpa_dbus_ctrl_iface_init - Initialize dbus control interface
 459  * @application_data: Pointer to application specific data structure
 460  * @dbus_path: DBus path to interface object
 461  * @dbus_service: DBus service name to register with
 462  * @messageHandler: a pointer to function which will handle dbus messages
 463  * coming on interface
 464  * Returns: 0 on success, -1 on failure
 465  *
 466  * Initialize the dbus control interface and start receiving commands from
 467  * external programs over the bus.
 468  */
 469 int wpa_dbus_ctrl_iface_init(struct wpas_dbus_priv *iface,
 470                              char *dbus_path, char *dbus_service,
 471                              struct wpa_dbus_object_desc *obj_desc)
 472 {
 473         DBusError error;
 474         int ret = -1;
 475         DBusObjectPathVTable wpa_vtable = {
 476                 &free_dbus_object_desc_cb, &message_handler,
 477                 NULL, NULL, NULL, NULL
 478         };
 479
 480         obj_desc->connection = iface->con;
 481         obj_desc->path = os_strdup(dbus_path);
 482
 483         /* Register the message handler for the global dbus interface */
 484         if (!dbus_connection_register_object_path(iface->con, dbus_path,
 485                                                   &wpa_vtable, obj_desc)) {
 486                 wpa_printf(MSG_ERROR, "dbus: Could not set up message handler");
 487                 return -1;
 488         }
 489
 490         /* Register our service with the message bus */
 491         dbus_error_init(&error);
 492         switch (dbus_bus_request_name(iface->con, dbus_service, 0, &error)) {
 493         case DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER:
 494                 ret = 0;
 495                 break;
 496         case DBUS_REQUEST_NAME_REPLY_EXISTS:
 497         case DBUS_REQUEST_NAME_REPLY_IN_QUEUE:
 498         case DBUS_REQUEST_NAME_REPLY_ALREADY_OWNER:
 499                 wpa_printf(MSG_ERROR,
 500                            "dbus: Could not request service name: already registered");
 501                 break;
 502         default:
 503                 wpa_printf(MSG_ERROR,
 504                            "dbus: Could not request service name: %s %s",
 505                            error.name, error.message);
 506                 break;
 507         }
 508         dbus_error_free(&error);
 509
 510         if (ret != 0)
 511                 return -1;
 512
 513         wpa_printf(MSG_DEBUG, "Providing DBus service '%s'.", dbus_service);
 514
 515         return 0;
 516 }
 517
 518
 519 /**
 520  * wpa_dbus_register_object_per_iface - Register a new object with dbus
 521  * @ctrl_iface: pointer to dbus private data
 522  * @path: DBus path to object
 523  * @ifname: interface name
 524  * @obj_desc: description of object's methods, signals and properties
 525  * Returns: 0 on success, -1 on error
 526  *
 527  * Registers a new interface with dbus and assigns it a dbus object path.
 528  */
 529 int wpa_dbus_register_object_per_iface(struct wpas_dbus_priv *ctrl_iface,
 530                                        const char *path, const char *ifname,
 531                                        struct wpa_dbus_object_desc *obj_desc)
 532 {
 533         DBusConnection *con;
 534         DBusError error;
 535         DBusObjectPathVTable vtable = {
 536                 &free_dbus_object_desc_cb, &message_handler,
 537                 NULL, NULL, NULL, NULL
 538         };
 539
 540         /* Do nothing if the control interface is not turned on */
 541         if (ctrl_iface == NULL)
 542                 return 0;
 543
 544         con = ctrl_iface->con;
 545         obj_desc->connection = con;
 546         obj_desc->path = os_strdup(path);
 547
 548         dbus_error_init(&error);
 549         /* Register the message handler for the interface functions */
 550         if (!dbus_connection_try_register_object_path(con, path, &vtable,
 551                                                       obj_desc, &error)) {
 552                 if (os_strcmp(error.name, DBUS_ERROR_OBJECT_PATH_IN_USE) == 0) {
 553                         wpa_printf(MSG_DEBUG, "dbus: %s", error.message);
 554                 } else {
 555                         wpa_printf(MSG_ERROR,
 556                                    "dbus: Could not set up message handler for interface %s object %s (error: %s message: %s)",
 557                                    ifname, path, error.name, error.message);
 558                 }
 559                 dbus_error_free(&error);
 560                 return -1;
 561         }
 562
 563         dbus_error_free(&error);
 564         return 0;
 565 }
 566
 567
 568 static void flush_object_timeout_handler(void *eloop_ctx, void *timeout_ctx);
 569
 570
 571 /**
 572  * wpa_dbus_unregister_object_per_iface - Unregisters DBus object
 573  * @ctrl_iface: Pointer to dbus private data
 574  * @path: DBus path to object which will be unregistered
 575  * Returns: Zero on success and -1 on failure
 576  *
 577  * Unregisters DBus object given by its path
 578  */
 579 int wpa_dbus_unregister_object_per_iface(
 580         struct wpas_dbus_priv *ctrl_iface, const char *path)
 581 {
 582         DBusConnection *con = ctrl_iface->con;
 583         struct wpa_dbus_object_desc *obj_desc = NULL;
 584
 585         dbus_connection_get_object_path_data(con, path, (void **) &obj_desc);
 586         if (!obj_desc) {
 587                 wpa_printf(MSG_ERROR,
 588                            "dbus: %s: Could not obtain object's private data: %s",
 589                            __func__, path);
 590                 return 0;
 591         }
 592
 593         eloop_cancel_timeout(flush_object_timeout_handler, con, obj_desc);
 594
 595         if (!dbus_connection_unregister_object_path(con, path))
 596                 return -1;
 597
 598         return 0;
 599 }
 600
 601
 602 static dbus_bool_t put_changed_properties(
 603         const struct wpa_dbus_object_desc *obj_dsc, const char *interface,
 604         DBusMessageIter *dict_iter, int clear_changed)
 605 {
 606         DBusMessageIter entry_iter;
 607         const struct wpa_dbus_property_desc *dsc;
 608         int i;
 609         DBusError error;
 610
 611         for (dsc = obj_dsc->properties, i = 0; dsc && dsc->dbus_property;
 612              dsc++, i++) {
 613                 if (obj_dsc->prop_changed_flags == NULL ||
 614                     !obj_dsc->prop_changed_flags[i])
 615                         continue;
 616                 if (os_strcmp(dsc->dbus_interface, interface) != 0)
 617                         continue;
 618                 if (clear_changed)
 619                         obj_dsc->prop_changed_flags[i] = 0;
 620
 621                 if (!dbus_message_iter_open_container(dict_iter,
 622                                                       DBUS_TYPE_DICT_ENTRY,
 623                                                       NULL, &entry_iter) ||
 624                     !dbus_message_iter_append_basic(&entry_iter,
 625                                                     DBUS_TYPE_STRING,
 626                                                     &dsc->dbus_property))
 627                         return FALSE;
 628
 629                 dbus_error_init(&error);
 630                 if (!dsc->getter(&entry_iter, &error, obj_dsc->user_data)) {
 631                         if (dbus_error_is_set(&error)) {
 632                                 wpa_printf(MSG_ERROR,
 633                                            "dbus: %s: Cannot get new value of property %s: (%s) %s",
 634                                            __func__, dsc->dbus_property,
 635                                            error.name, error.message);
 636                         } else {
 637                                 wpa_printf(MSG_ERROR,
 638                                            "dbus: %s: Cannot get new value of property %s",
 639                                            __func__, dsc->dbus_property);
 640                         }
 641                         dbus_error_free(&error);
 642                         return FALSE;
 643                 }
 644
 645                 if (!dbus_message_iter_close_container(dict_iter, &entry_iter))
 646                         return FALSE;
 647         }
 648
 649         return TRUE;
 650 }
 651
 652
 653 static void do_send_prop_changed_signal(
 654         DBusConnection *con, const char *path, const char *interface,
 655         const struct wpa_dbus_object_desc *obj_dsc)
 656 {
 657         DBusMessage *msg;
 658         DBusMessageIter signal_iter, dict_iter;
 659
 660         msg = dbus_message_new_signal(path, DBUS_INTERFACE_PROPERTIES,
 661                                       "PropertiesChanged");
 662         if (msg == NULL)
 663                 return;
 664
 665         dbus_message_iter_init_append(msg, &signal_iter);
 666
 667         if (!dbus_message_iter_append_basic(&signal_iter, DBUS_TYPE_STRING,
 668                                             &interface) ||
 669             /* Changed properties dict */
 670             !dbus_message_iter_open_container(&signal_iter, DBUS_TYPE_ARRAY,
 671                                               "{sv}", &dict_iter) ||
 672             !put_changed_properties(obj_dsc, interface, &dict_iter, 0) ||
 673             !dbus_message_iter_close_container(&signal_iter, &dict_iter) ||
 674             /* Invalidated properties array (empty) */
 675             !dbus_message_iter_open_container(&signal_iter, DBUS_TYPE_ARRAY,
 676                                               "s", &dict_iter) ||
 677             !dbus_message_iter_close_container(&signal_iter, &dict_iter)) {
 678                 wpa_printf(MSG_DEBUG, "dbus: %s: Failed to construct signal",
 679                            __func__);
 680         } else {
 681                 dbus_connection_send(con, msg, NULL);
 682         }
 683
 684         dbus_message_unref(msg);
 685 }
 686
 687
 688 static void do_send_deprecated_prop_changed_signal(
 689         DBusConnection *con, const char *path, const char *interface,
 690         const struct wpa_dbus_object_desc *obj_dsc)
 691 {
 692         DBusMessage *msg;
 693         DBusMessageIter signal_iter, dict_iter;
 694
 695         msg = dbus_message_new_signal(path, interface, "PropertiesChanged");
 696         if (msg == NULL)
 697                 return;
 698
 699         dbus_message_iter_init_append(msg, &signal_iter);
 700
 701         if (!dbus_message_iter_open_container(&signal_iter, DBUS_TYPE_ARRAY,
 702                                               "{sv}", &dict_iter) ||
 703             !put_changed_properties(obj_dsc, interface, &dict_iter, 1) ||
 704             !dbus_message_iter_close_container(&signal_iter, &dict_iter)) {
 705                 wpa_printf(MSG_DEBUG, "dbus: %s: Failed to construct signal",
 706                            __func__);
 707         } else {
 708                 dbus_connection_send(con, msg, NULL);
 709         }
 710
 711         dbus_message_unref(msg);
 712 }
 713
 714
 715 static void send_prop_changed_signal(
 716         DBusConnection *con, const char *path, const char *interface,
 717         const struct wpa_dbus_object_desc *obj_dsc)
 718 {
 719         /*
 720          * First, send property change notification on the standardized
 721          * org.freedesktop.DBus.Properties interface. This call will not
 722          * clear the property change bits, so that they are preserved for
 723          * the call that follows.
 724          */
 725         do_send_prop_changed_signal(con, path, interface, obj_dsc);
 726
 727         /*
 728          * Now send PropertiesChanged on our own interface for backwards
 729          * compatibility. This is deprecated and will be removed in a future
 730          * release.
 731          */
 732         do_send_deprecated_prop_changed_signal(con, path, interface, obj_dsc);
 733
 734         /* Property change bits have now been cleared. */
 735 }
 736
 737
 738 static void flush_object_timeout_handler(void *eloop_ctx, void *timeout_ctx)
 739 {
 740         DBusConnection *con = eloop_ctx;
 741         struct wpa_dbus_object_desc *obj_desc = timeout_ctx;
 742
 743         wpa_printf(MSG_DEBUG,
 744                    "dbus: %s: Timeout - sending changed properties of object %s",
 745                    __func__, obj_desc->path);
 746         wpa_dbus_flush_object_changed_properties(con, obj_desc->path);
 747 }
 748
 749
 750 static void recursive_flush_changed_properties(DBusConnection *con,
 751                                                const char *path)
 752 {
 753         char **objects = NULL;
 754         char subobj_path[WPAS_DBUS_OBJECT_PATH_MAX];
 755         int i;
 756
 757         wpa_dbus_flush_object_changed_properties(con, path);
 758
 759         if (!dbus_connection_list_registered(con, path, &objects))
 760                 goto out;
 761
 762         for (i = 0; objects[i]; i++) {
 763                 os_snprintf(subobj_path, WPAS_DBUS_OBJECT_PATH_MAX,
 764                             "%s/%s", path, objects[i]);
 765                 recursive_flush_changed_properties(con, subobj_path);
 766         }
 767
 768 out:
 769         dbus_free_string_array(objects);
 770 }
 771
 772
 773 /**
 774  * wpa_dbus_flush_all_changed_properties - Send all PropertiesChanged signals
 775  * @con: DBus connection
 776  *
 777  * Traverses through all registered objects and sends PropertiesChanged for
 778  * each properties.
 779  */
 780 void wpa_dbus_flush_all_changed_properties(DBusConnection *con)
 781 {
 782         recursive_flush_changed_properties(con, WPAS_DBUS_NEW_PATH);
 783 }
 784
 785
 786 /**
 787  * wpa_dbus_flush_object_changed_properties - Send PropertiesChanged for object
 788  * @con: DBus connection
 789  * @path: path to a DBus object for which PropertiesChanged will be sent.
 790  *
 791  * Iterates over all properties registered with object and for each interface
 792  * containing properties marked as changed, sends a PropertiesChanged signal
 793  * containing names and new values of properties that have changed.
 794  *
 795  * You need to call this function after wpa_dbus_mark_property_changed()
 796  * if you want to send PropertiesChanged signal immediately (i.e., without
 797  * waiting timeout to expire). PropertiesChanged signal for an object is sent
 798  * automatically short time after first marking property as changed. All
 799  * PropertiesChanged signals are sent automatically after responding on DBus
 800  * message, so if you marked a property changed as a result of DBus call
 801  * (e.g., param setter), you usually do not need to call this function.
 802  */
 803 void wpa_dbus_flush_object_changed_properties(DBusConnection *con,
 804                                               const char *path)
 805 {
 806         struct wpa_dbus_object_desc *obj_desc = NULL;
 807         const struct wpa_dbus_property_desc *dsc;
 808         int i;
 809
 810         dbus_connection_get_object_path_data(con, path, (void **) &obj_desc);
 811         if (!obj_desc)
 812                 return;
 813         eloop_cancel_timeout(flush_object_timeout_handler, con, obj_desc);
 814
 815         for (dsc = obj_desc->properties, i = 0; dsc && dsc->dbus_property;
 816              dsc++, i++) {
 817                 if (obj_desc->prop_changed_flags == NULL ||
 818                     !obj_desc->prop_changed_flags[i])
 819                         continue;
 820                 send_prop_changed_signal(con, path, dsc->dbus_interface,
 821                                          obj_desc);
 822         }
 823 }
 824
 825
 826 #define WPA_DBUS_SEND_PROP_CHANGED_TIMEOUT 5000
 827
 828
 829 /**
 830  * wpa_dbus_mark_property_changed - Mark a property as changed and
 831  * @iface: dbus priv struct
 832  * @path: path to DBus object which property has changed
 833  * @interface: interface containing changed property
 834  * @property: property name which has changed
 835  *
 836  * Iterates over all properties registered with an object and marks the one
 837  * given in parameters as changed. All parameters registered for an object
 838  * within a single interface will be aggregated together and sent in one
 839  * PropertiesChanged signal when function
 840  * wpa_dbus_flush_object_changed_properties() is called.
 841  */
 842 void wpa_dbus_mark_property_changed(struct wpas_dbus_priv *iface,
 843                                     const char *path, const char *interface,
 844                                     const char *property)
 845 {
 846         struct wpa_dbus_object_desc *obj_desc = NULL;
 847         const struct wpa_dbus_property_desc *dsc;
 848         int i = 0;
 849
 850         if (iface == NULL)
 851                 return;
 852
 853         dbus_connection_get_object_path_data(iface->con, path,
 854                                              (void **) &obj_desc);
 855         if (!obj_desc) {
 856                 wpa_printf(MSG_ERROR,
 857                            "dbus: wpa_dbus_property_changed: could not obtain object's private data: %s",
 858                            path);
 859                 return;
 860         }
 861
 862         for (dsc = obj_desc->properties; dsc && dsc->dbus_property; dsc++, i++)
 863                 if (os_strcmp(property, dsc->dbus_property) == 0 &&
 864                     os_strcmp(interface, dsc->dbus_interface) == 0) {
 865                         if (obj_desc->prop_changed_flags)
 866                                 obj_desc->prop_changed_flags[i] = 1;
 867                         break;
 868                 }
 869
 870         if (!dsc || !dsc->dbus_property) {
 871                 wpa_printf(MSG_ERROR,
 872                            "dbus: wpa_dbus_property_changed: no property %s in object %s",
 873                            property, path);
 874                 return;
 875         }
 876
 877         if (!eloop_is_timeout_registered(flush_object_timeout_handler,
 878                                          iface->con, obj_desc)) {
 879                 eloop_register_timeout(0, WPA_DBUS_SEND_PROP_CHANGED_TIMEOUT,
 880                                        flush_object_timeout_handler,
 881                                        iface->con, obj_desc);
 882         }
 883 }
 884
 885
 886 /**
 887  * wpa_dbus_get_object_properties - Put object's properties into dictionary
 888  * @iface: dbus priv struct
 889  * @path: path to DBus object which properties will be obtained
 890  * @interface: interface name which properties will be obtained
 891  * @iter: DBus message iter at which to append property dictionary.
 892  *
 893  * Iterates over all properties registered with object and execute getters
 894  * of those, which are readable and which interface matches interface
 895  * specified as argument. Obtained properties values are stored in
 896  * dict_iter dictionary.
 897  */
 898 dbus_bool_t wpa_dbus_get_object_properties(struct wpas_dbus_priv *iface,
 899                                            const char *path,
 900                                            const char *interface,
 901                                            DBusMessageIter *iter)
 902 {
 903         struct wpa_dbus_object_desc *obj_desc = NULL;
 904         DBusMessageIter dict_iter;
 905         DBusError error;
 906
 907         dbus_connection_get_object_path_data(iface->con, path,
 908                                              (void **) &obj_desc);
 909         if (!obj_desc) {
 910                 wpa_printf(MSG_ERROR,
 911                            "dbus: %s: could not obtain object's private data: %s",
 912                            __func__, path);
 913                 return FALSE;
 914         }
 915
 916         if (!wpa_dbus_dict_open_write(iter, &dict_iter)) {
 917                 wpa_printf(MSG_ERROR, "dbus: %s: failed to open message dict",
 918                            __func__);
 919                 return FALSE;
 920         }
 921
 922         dbus_error_init(&error);
 923         if (!fill_dict_with_properties(&dict_iter, obj_desc->properties,
 924                                        interface, obj_desc->user_data,
 925                                        &error)) {
 926                 wpa_printf(MSG_ERROR,
 927                            "dbus: %s: failed to get object properties: (%s) %s",
 928                            __func__,
 929                            dbus_error_is_set(&error) ? error.name : "none",
 930                            dbus_error_is_set(&error) ? error.message : "none");
 931                 dbus_error_free(&error);
 932                 return FALSE;
 933         }
 934
 935         return wpa_dbus_dict_close_write(iter, &dict_iter);
 936 }
 937
 938 /**
 939  * wpas_dbus_new_decompose_object_path - Decompose an interface object path into parts
 940  * @path: The dbus object path
 941  * @sep: Separating part (e.g., "Networks" or "PersistentGroups")
 942  * @item: (out) The part following the specified separator, if any
 943  * Returns: The object path of the interface this path refers to
 944  *
 945  * For a given object path, decomposes the object path into object id and
 946  * requested part, if those parts exist. The caller is responsible for freeing
 947  * the returned value. The *item pointer points to that allocated value and must
 948  * not be freed separately.
 949  *
 950  * As an example, path = "/fi/w1/wpa_supplicant1/Interfaces/1/Networks/0" and
 951  * sep = "Networks" would result in "/fi/w1/wpa_supplicant1/Interfaces/1"
 952  * getting returned and *items set to point to "0".
 953  */
 954 char * wpas_dbus_new_decompose_object_path(const char *path, const char *sep,
 955                                            char **item)
 956 {
 957         const unsigned int dev_path_prefix_len =
 958                 os_strlen(WPAS_DBUS_NEW_PATH_INTERFACES "/");
 959         char *obj_path_only;
 960         char *pos;
 961         size_t sep_len;
 962
 963         *item = NULL;
 964
 965         /* Verify that this starts with our interface prefix */
 966         if (os_strncmp(path, WPAS_DBUS_NEW_PATH_INTERFACES "/",
 967                        dev_path_prefix_len) != 0)
 968                 return NULL; /* not our path */
 969
 970         /* Ensure there's something at the end of the path */
 971         if ((path + dev_path_prefix_len)[0] == '\0')
 972                 return NULL;
 973
 974         obj_path_only = os_strdup(path);
 975         if (obj_path_only == NULL)
 976                 return NULL;
 977
 978         pos = obj_path_only + dev_path_prefix_len;
 979         pos = os_strchr(pos, '/');
 980         if (pos == NULL)
 981                 return obj_path_only; /* no next item on the path */
 982
 983          /* Separate network interface prefix from the path */
 984         *pos++ = '\0';
 985
 986         sep_len = os_strlen(sep);
 987         if (os_strncmp(pos, sep, sep_len) != 0 || pos[sep_len] != '/')
 988                 return obj_path_only; /* no match */
 989
 990          /* return a pointer to the requested item */
 991         *item = pos + sep_len + 1;
 992         return obj_path_only;
 993 }
 994
 995
 996 /**
 997  * wpas_dbus_reply_new_from_error - Create a new D-Bus error message from a
 998  *   dbus error structure
 999  * @message: The original request message for which the error is a reply
1000  * @error: The error containing a name and a descriptive error cause
1001  * @fallback_name: A generic error name if @error was not set
1002  * @fallback_string: A generic error string if @error was not set
1003  * Returns: A new D-Bus error message
1004  *
1005  * Given a DBusMessage structure, creates a new D-Bus error message using
1006  * the error name and string contained in that structure.
1007  */
1008 DBusMessage * wpas_dbus_reply_new_from_error(DBusMessage *message,
1009                                              DBusError *error,
1010                                              const char *fallback_name,
1011                                              const char *fallback_string)
1012 {
1013         if (error && error->name && error->message) {
1014                 return dbus_message_new_error(message, error->name,
1015                                               error->message);
1016         }
1017         if (fallback_name && fallback_string) {
1018                 return dbus_message_new_error(message, fallback_name,
1019                                               fallback_string);
1020         }
1021         return NULL;
1022 }