wpa_supplicant/dbus/dbus_old.c

   1 /*
   2  * WPA Supplicant / dbus-based control interface
   3  * Copyright (c) 2006, Dan Williams <dcbw@redhat.com> and Red Hat, Inc.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16 #include <dbus/dbus.h>
  17
  18 #include "common.h"
  19 #include "eloop.h"
  20 #include "drivers/driver.h"
  21 #include "wps/wps.h"
  22 #include "../config.h"
  23 #include "../wpa_supplicant_i.h"
  24 #include "dbus_old.h"
  25 #include "dbus_old_handlers.h"
  26 #include "dbus_common.h"
  27 #include "dbus_common_i.h"
  28
  29
  30 /**
  31  * wpas_dbus_decompose_object_path - Decompose an interface object path into parts
  32  * @path: The dbus object path
  33  * @network: (out) the configured network this object path refers to, if any
  34  * @bssid: (out) the scanned bssid this object path refers to, if any
  35  * Returns: The object path of the network interface this path refers to
  36  *
  37  * For a given object path, decomposes the object path into object id, network,
  38  * and BSSID parts, if those parts exist.
  39  */
  40 char * wpas_dbus_decompose_object_path(const char *path, char **network,
  41                                        char **bssid)
  42 {
  43         const unsigned int dev_path_prefix_len =
  44                 strlen(WPAS_DBUS_PATH_INTERFACES "/");
  45         char *obj_path_only;
  46         char *next_sep;
  47
  48         /* Be a bit paranoid about path */
  49         if (!path || strncmp(path, WPAS_DBUS_PATH_INTERFACES "/",
  50                              dev_path_prefix_len))
  51                 return NULL;
  52
  53         /* Ensure there's something at the end of the path */
  54         if ((path + dev_path_prefix_len)[0] == '\0')
  55                 return NULL;
  56
  57         obj_path_only = os_strdup(path);
  58         if (obj_path_only == NULL)
  59                 return NULL;
  60
  61         next_sep = strchr(obj_path_only + dev_path_prefix_len, '/');
  62         if (next_sep != NULL) {
  63                 const char *net_part = strstr(next_sep,
  64                                               WPAS_DBUS_NETWORKS_PART "/");
  65                 const char *bssid_part = strstr(next_sep,
  66                                                 WPAS_DBUS_BSSIDS_PART "/");
  67
  68                 if (network && net_part) {
  69                         /* Deal with a request for a configured network */
  70                         const char *net_name = net_part +
  71                                 strlen(WPAS_DBUS_NETWORKS_PART "/");
  72                         *network = NULL;
  73                         if (strlen(net_name))
  74                                 *network = os_strdup(net_name);
  75                 } else if (bssid && bssid_part) {
  76                         /* Deal with a request for a scanned BSSID */
  77                         const char *bssid_name = bssid_part +
  78                                 strlen(WPAS_DBUS_BSSIDS_PART "/");
  79                         if (strlen(bssid_name))
  80                                 *bssid = os_strdup(bssid_name);
  81                         else
  82                                 *bssid = NULL;
  83                 }
  84
  85                 /* Cut off interface object path before "/" */
  86                 *next_sep = '\0';
  87         }
  88
  89         return obj_path_only;
  90 }
  91
  92
  93 /**
  94  * wpas_dbus_new_invalid_iface_error - Return a new invalid interface error message
  95  * @message: Pointer to incoming dbus message this error refers to
  96  * Returns: A dbus error message
  97  *
  98  * Convenience function to create and return an invalid interface error
  99  */
 100 DBusMessage * wpas_dbus_new_invalid_iface_error(DBusMessage *message)
 101 {
 102         return dbus_message_new_error(message, WPAS_ERROR_INVALID_IFACE,
 103                                       "wpa_supplicant knows nothing about "
 104                                       "this interface.");
 105 }
 106
 107
 108 /**
 109  * wpas_dbus_new_invalid_network_error - Return a new invalid network error message
 110  * @message: Pointer to incoming dbus message this error refers to
 111  * Returns: a dbus error message
 112  *
 113  * Convenience function to create and return an invalid network error
 114  */
 115 DBusMessage * wpas_dbus_new_invalid_network_error(DBusMessage *message)
 116 {
 117         return dbus_message_new_error(message, WPAS_ERROR_INVALID_NETWORK,
 118                                       "The requested network does not exist.");
 119 }
 120
 121
 122 /**
 123  * wpas_dbus_new_invalid_bssid_error - Return a new invalid bssid error message
 124  * @message: Pointer to incoming dbus message this error refers to
 125  * Returns: a dbus error message
 126  *
 127  * Convenience function to create and return an invalid bssid error
 128  */
 129 static DBusMessage * wpas_dbus_new_invalid_bssid_error(DBusMessage *message)
 130 {
 131         return dbus_message_new_error(message, WPAS_ERROR_INVALID_BSSID,
 132                                       "The BSSID requested was invalid.");
 133 }
 134
 135
 136 /**
 137  * wpas_dispatch_network_method - dispatch messages for configured networks
 138  * @message: the incoming dbus message
 139  * @wpa_s: a network interface's data
 140  * @network_id: id of the configured network we're interested in
 141  * Returns: a reply dbus message, or a dbus error message
 142  *
 143  * This function dispatches all incoming dbus messages for configured networks.
 144  */
 145 static DBusMessage * wpas_dispatch_network_method(DBusMessage *message,
 146                                                   struct wpa_supplicant *wpa_s,
 147                                                   int network_id)
 148 {
 149         DBusMessage *reply = NULL;
 150         const char *method = dbus_message_get_member(message);
 151         struct wpa_ssid *ssid;
 152
 153         ssid = wpa_config_get_network(wpa_s->conf, network_id);
 154         if (ssid == NULL)
 155                 return wpas_dbus_new_invalid_network_error(message);
 156
 157         if (!strcmp(method, "set"))
 158                 reply = wpas_dbus_iface_set_network(message, wpa_s, ssid);
 159         else if (!strcmp(method, "enable"))
 160                 reply = wpas_dbus_iface_enable_network(message, wpa_s, ssid);
 161         else if (!strcmp(method, "disable"))
 162                 reply = wpas_dbus_iface_disable_network(message, wpa_s, ssid);
 163
 164         return reply;
 165 }
 166
 167
 168 /**
 169  * wpas_dispatch_bssid_method - dispatch messages for scanned networks
 170  * @message: the incoming dbus message
 171  * @wpa_s: a network interface's data
 172  * @bssid: bssid of the scanned network we're interested in
 173  * Returns: a reply dbus message, or a dbus error message
 174  *
 175  * This function dispatches all incoming dbus messages for scanned networks.
 176  */
 177 static DBusMessage * wpas_dispatch_bssid_method(DBusMessage *message,
 178                                                 struct wpa_supplicant *wpa_s,
 179                                                 const char *bssid)
 180 {
 181         DBusMessage *reply = NULL;
 182         const char *method = dbus_message_get_member(message);
 183         struct wpa_scan_res *res = NULL;
 184         size_t i;
 185
 186         /* Ensure we actually have scan data */
 187         if (wpa_s->scan_res == NULL &&
 188             wpa_supplicant_get_scan_results(wpa_s) < 0) {
 189                 reply = wpas_dbus_new_invalid_bssid_error(message);
 190                 goto out;
 191         }
 192
 193         /* Find the bssid's scan data */
 194         for (i = 0; i < wpa_s->scan_res->num; i++) {
 195                 struct wpa_scan_res *search_res = wpa_s->scan_res->res[i];
 196                 char mac_str[18];
 197
 198                 memset(mac_str, 0, sizeof(mac_str));
 199                 snprintf(mac_str, sizeof(mac_str) - 1, WPAS_DBUS_BSSID_FORMAT,
 200                          MAC2STR(search_res->bssid));
 201                 if (!strcmp(bssid, mac_str)) {
 202                         res = search_res;
 203                         break;
 204                 }
 205         }
 206
 207         if (!res) {
 208                 reply = wpas_dbus_new_invalid_bssid_error(message);
 209                 goto out;
 210         }
 211
 212         /* Dispatch the method call against the scanned bssid */
 213         if (!strcmp(method, "properties"))
 214                 reply = wpas_dbus_bssid_properties(message, wpa_s, res);
 215
 216 out:
 217         return reply;
 218 }
 219
 220
 221 /**
 222  * wpas_iface_message_handler - Dispatch messages for interfaces or networks
 223  * @connection: Connection to the system message bus
 224  * @message: An incoming dbus message
 225  * @user_data: A pointer to a dbus control interface data structure
 226  * Returns: Whether or not the message was handled
 227  *
 228  * This function dispatches all incoming dbus messages for network interfaces,
 229  * or objects owned by them, such as scanned BSSIDs and configured networks.
 230  */
 231 static DBusHandlerResult wpas_iface_message_handler(DBusConnection *connection,
 232                                                     DBusMessage *message,
 233                                                     void *user_data)
 234 {
 235         struct wpa_supplicant *wpa_s = user_data;
 236         const char *method = dbus_message_get_member(message);
 237         const char *path = dbus_message_get_path(message);
 238         const char *msg_interface = dbus_message_get_interface(message);
 239         char *iface_obj_path = NULL;
 240         char *network = NULL;
 241         char *bssid = NULL;
 242         DBusMessage *reply = NULL;
 243
 244         /* Caller must specify a message interface */
 245         if (!msg_interface)
 246                 goto out;
 247
 248         iface_obj_path = wpas_dbus_decompose_object_path(path, &network,
 249                                                          &bssid);
 250         if (iface_obj_path == NULL) {
 251                 reply = wpas_dbus_new_invalid_iface_error(message);
 252                 goto out;
 253         }
 254
 255         /* Make sure the message's object path actually refers to the
 256          * wpa_supplicant structure it's supposed to (which is wpa_s)
 257          */
 258         if (wpa_supplicant_get_iface_by_dbus_path(wpa_s->global,
 259                                                   iface_obj_path) != wpa_s) {
 260                 reply = wpas_dbus_new_invalid_iface_error(message);
 261                 goto out;
 262         }
 263
 264         if (network && !strcmp(msg_interface, WPAS_DBUS_IFACE_NETWORK)) {
 265                 /* A method for one of this interface's configured networks */
 266                 int nid = strtoul(network, NULL, 10);
 267                 if (errno != EINVAL)
 268                         reply = wpas_dispatch_network_method(message, wpa_s,
 269                                                              nid);
 270                 else
 271                         reply = wpas_dbus_new_invalid_network_error(message);
 272         } else if (bssid && !strcmp(msg_interface, WPAS_DBUS_IFACE_BSSID)) {
 273                 /* A method for one of this interface's scanned BSSIDs */
 274                 reply = wpas_dispatch_bssid_method(message, wpa_s, bssid);
 275         } else if (!strcmp(msg_interface, WPAS_DBUS_IFACE_INTERFACE)) {
 276                 /* A method for an interface only. */
 277                 if (!strcmp(method, "scan"))
 278                         reply = wpas_dbus_iface_scan(message, wpa_s);
 279                 else if (!strcmp(method, "scanResults"))
 280                         reply = wpas_dbus_iface_scan_results(message, wpa_s);
 281                 else if (!strcmp(method, "addNetwork"))
 282                         reply = wpas_dbus_iface_add_network(message, wpa_s);
 283                 else if (!strcmp(method, "removeNetwork"))
 284                         reply = wpas_dbus_iface_remove_network(message, wpa_s);
 285                 else if (!strcmp(method, "selectNetwork"))
 286                         reply = wpas_dbus_iface_select_network(message, wpa_s);
 287                 else if (!strcmp(method, "capabilities"))
 288                         reply = wpas_dbus_iface_capabilities(message, wpa_s);
 289                 else if (!strcmp(method, "disconnect"))
 290                         reply = wpas_dbus_iface_disconnect(message, wpa_s);
 291                 else if (!strcmp(method, "setAPScan"))
 292                         reply = wpas_dbus_iface_set_ap_scan(message, wpa_s);
 293                 else if (!strcmp(method, "setSmartcardModules"))
 294                         reply = wpas_dbus_iface_set_smartcard_modules(message,
 295                                                                       wpa_s);
 296                 else if (!strcmp(method, "state"))
 297                         reply = wpas_dbus_iface_get_state(message, wpa_s);
 298                 else if (!strcmp(method, "scanning"))
 299                         reply = wpas_dbus_iface_get_scanning(message, wpa_s);
 300                 else if (!strcmp(method, "setBlobs"))
 301                         reply = wpas_dbus_iface_set_blobs(message, wpa_s);
 302                 else if (!strcmp(method, "removeBlobs"))
 303                         reply = wpas_dbus_iface_remove_blobs(message, wpa_s);
 304 #ifdef CONFIG_WPS
 305                 else if (!os_strcmp(method, "wpsPbc"))
 306                         reply = wpas_dbus_iface_wps_pbc(message, wpa_s);
 307                 else if (!os_strcmp(method, "wpsPin"))
 308                         reply = wpas_dbus_iface_wps_pin(message, wpa_s);
 309                 else if (!os_strcmp(method, "wpsReg"))
 310                         reply = wpas_dbus_iface_wps_reg(message, wpa_s);
 311 #endif /* CONFIG_WPS */
 312         }
 313
 314         /* If the message was handled, send back the reply */
 315         if (reply) {
 316                 if (!dbus_message_get_no_reply(message))
 317                         dbus_connection_send(connection, reply, NULL);
 318                 dbus_message_unref(reply);
 319         }
 320
 321 out:
 322         os_free(iface_obj_path);
 323         os_free(network);
 324         os_free(bssid);
 325         return reply ? DBUS_HANDLER_RESULT_HANDLED :
 326                 DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 327 }
 328
 329
 330 /**
 331  * wpas_message_handler - dispatch incoming dbus messages
 332  * @connection: connection to the system message bus
 333  * @message: an incoming dbus message
 334  * @user_data: a pointer to a dbus control interface data structure
 335  * Returns: whether or not the message was handled
 336  *
 337  * This function dispatches all incoming dbus messages to the correct
 338  * handlers, depending on what the message's target object path is,
 339  * and what the method call is.
 340  */
 341 static DBusHandlerResult wpas_message_handler(DBusConnection *connection,
 342         DBusMessage *message, void *user_data)
 343 {
 344         struct wpas_dbus_priv *ctrl_iface = user_data;
 345         const char *method;
 346         const char *path;
 347         const char *msg_interface;
 348         DBusMessage *reply = NULL;
 349
 350         method = dbus_message_get_member(message);
 351         path = dbus_message_get_path(message);
 352         msg_interface = dbus_message_get_interface(message);
 353         if (!method || !path || !ctrl_iface || !msg_interface)
 354                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 355
 356         /* Validate the method interface */
 357         if (strcmp(msg_interface, WPAS_DBUS_INTERFACE) != 0)
 358                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 359
 360         if (!strcmp(path, WPAS_DBUS_PATH)) {
 361                 /* dispatch methods against our global dbus interface here */
 362                 if (!strcmp(method, "addInterface")) {
 363                         reply = wpas_dbus_global_add_interface(
 364                                 message, ctrl_iface->global);
 365                 } else if (!strcmp(method, "removeInterface")) {
 366                         reply = wpas_dbus_global_remove_interface(
 367                                 message, ctrl_iface->global);
 368                 } else if (!strcmp(method, "getInterface")) {
 369                         reply = wpas_dbus_global_get_interface(
 370                                 message, ctrl_iface->global);
 371                 } else if (!strcmp(method, "setDebugParams")) {
 372                         reply = wpas_dbus_global_set_debugparams(
 373                                 message, ctrl_iface->global);
 374                 }
 375         }
 376
 377         /* If the message was handled, send back the reply */
 378         if (reply) {
 379                 if (!dbus_message_get_no_reply(message))
 380                         dbus_connection_send(connection, reply, NULL);
 381                 dbus_message_unref(reply);
 382         }
 383
 384         return reply ? DBUS_HANDLER_RESULT_HANDLED :
 385                 DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 386 }
 387
 388
 389 /**
 390  * wpa_supplicant_dbus_notify_scan_results - Send a scan results signal
 391  * @wpa_s: %wpa_supplicant network interface data
 392  * Returns: 0 on success, -1 on failure
 393  *
 394  * Notify listeners that this interface has updated scan results.
 395  */
 396 void wpa_supplicant_dbus_notify_scan_results(struct wpa_supplicant *wpa_s)
 397 {
 398         struct wpas_dbus_priv *iface = wpa_s->global->dbus;
 399         DBusMessage *_signal;
 400         const char *path;
 401
 402         /* Do nothing if the control interface is not turned on */
 403         if (iface == NULL)
 404                 return;
 405
 406         path = wpa_supplicant_get_dbus_path(wpa_s);
 407         if (path == NULL) {
 408                 perror("wpa_supplicant_dbus_notify_scan_results[dbus]: "
 409                        "interface didn't have a dbus path");
 410                 wpa_printf(MSG_ERROR,
 411                            "wpa_supplicant_dbus_notify_scan_results[dbus]: "
 412                            "interface didn't have a dbus path; can't send "
 413                            "scan result signal.");
 414                 return;
 415         }
 416         _signal = dbus_message_new_signal(path, WPAS_DBUS_IFACE_INTERFACE,
 417                                           "ScanResultsAvailable");
 418         if (_signal == NULL) {
 419                 perror("wpa_supplicant_dbus_notify_scan_results[dbus]: "
 420                        "couldn't create dbus signal; likely out of memory");
 421                 wpa_printf(MSG_ERROR, "dbus control interface: not enough "
 422                            "memory to send scan results signal.");
 423                 return;
 424         }
 425         dbus_connection_send(iface->con, _signal, NULL);
 426         dbus_message_unref(_signal);
 427 }
 428
 429
 430 /**
 431  * wpa_supplicant_dbus_notify_state_change - Send a state change signal
 432  * @wpa_s: %wpa_supplicant network interface data
 433  * @new_state: new state wpa_supplicant is entering
 434  * @old_state: old state wpa_supplicant is leaving
 435  * Returns: 0 on success, -1 on failure
 436  *
 437  * Notify listeners that wpa_supplicant has changed state
 438  */
 439 void wpa_supplicant_dbus_notify_state_change(struct wpa_supplicant *wpa_s,
 440                                              enum wpa_states new_state,
 441                                              enum wpa_states old_state)
 442 {
 443         struct wpas_dbus_priv *iface;
 444         DBusMessage *_signal = NULL;
 445         const char *path;
 446         const char *new_state_str, *old_state_str;
 447
 448         /* Do nothing if the control interface is not turned on */
 449         if (wpa_s->global == NULL)
 450                 return;
 451         iface = wpa_s->global->dbus;
 452         if (iface == NULL)
 453                 return;
 454
 455         /* Only send signal if state really changed */
 456         if (new_state == old_state)
 457                 return;
 458
 459         path = wpa_supplicant_get_dbus_path(wpa_s);
 460         if (path == NULL) {
 461                 perror("wpa_supplicant_dbus_notify_state_change[dbus]: "
 462                        "interface didn't have a dbus path");
 463                 wpa_printf(MSG_ERROR,
 464                            "wpa_supplicant_dbus_notify_state_change[dbus]: "
 465                            "interface didn't have a dbus path; can't send "
 466                            "signal.");
 467                 return;
 468         }
 469         _signal = dbus_message_new_signal(path, WPAS_DBUS_IFACE_INTERFACE,
 470                                           "StateChange");
 471         if (_signal == NULL) {
 472                 perror("wpa_supplicant_dbus_notify_state_change[dbus]: "
 473                        "couldn't create dbus signal; likely out of memory");
 474                 wpa_printf(MSG_ERROR,
 475                            "wpa_supplicant_dbus_notify_state_change[dbus]: "
 476                            "couldn't create dbus signal; likely out of "
 477                            "memory.");
 478                 return;
 479         }
 480
 481         new_state_str = wpa_supplicant_state_txt(new_state);
 482         old_state_str = wpa_supplicant_state_txt(old_state);
 483         if (new_state_str == NULL || old_state_str == NULL) {
 484                 perror("wpa_supplicant_dbus_notify_state_change[dbus]: "
 485                        "couldn't convert state strings");
 486                 wpa_printf(MSG_ERROR,
 487                            "wpa_supplicant_dbus_notify_state_change[dbus]: "
 488                            "couldn't convert state strings.");
 489                 goto out;
 490         }
 491
 492         if (!dbus_message_append_args(_signal,
 493                                       DBUS_TYPE_STRING, &new_state_str,
 494                                       DBUS_TYPE_STRING, &old_state_str,
 495                                       DBUS_TYPE_INVALID)) {
 496                 perror("wpa_supplicant_dbus_notify_state_change[dbus]: "
 497                        "not enough memory to construct state change signal.");
 498                 wpa_printf(MSG_ERROR,
 499                            "wpa_supplicant_dbus_notify_state_change[dbus]: "
 500                            "not enough memory to construct state change "
 501                            "signal.");
 502                 goto out;
 503         }
 504
 505         dbus_connection_send(iface->con, _signal, NULL);
 506
 507 out:
 508         dbus_message_unref(_signal);
 509 }
 510
 511
 512 /**
 513  * wpa_supplicant_dbus_notify_scanning - send scanning status
 514  * @wpa_s: %wpa_supplicant network interface data
 515  * Returns: 0 on success, -1 on failure
 516  *
 517  * Notify listeners of interface scanning state changes
 518  */
 519 void wpa_supplicant_dbus_notify_scanning(struct wpa_supplicant *wpa_s)
 520 {
 521         struct wpas_dbus_priv *iface = wpa_s->global->dbus;
 522         DBusMessage *_signal;
 523         const char *path;
 524         dbus_bool_t scanning = wpa_s->scanning ? TRUE : FALSE;
 525
 526         /* Do nothing if the control interface is not turned on */
 527         if (iface == NULL)
 528                 return;
 529
 530         path = wpa_supplicant_get_dbus_path(wpa_s);
 531         if (path == NULL) {
 532                 perror("wpa_supplicant_dbus_notify_scanning[dbus]: interface "
 533                        "didn't have a dbus path");
 534                 wpa_printf(MSG_ERROR,
 535                            "%s[dbus]: interface didn't have a dbus path; "
 536                            "can't send scanning signal.", __FUNCTION__);
 537                 return;
 538         }
 539         _signal = dbus_message_new_signal(path, WPAS_DBUS_IFACE_INTERFACE,
 540                                           "Scanning");
 541         if (_signal == NULL) {
 542                 perror("wpa_supplicant_dbus_notify_scanning[dbus]: couldn't "
 543                        "create dbus signal; likely out of memory");
 544                 wpa_printf(MSG_ERROR, "%s[dbus]: dbus control interface: not "
 545                            "enough memory to send scan results signal.",
 546                            __FUNCTION__);
 547                 return;
 548         }
 549
 550         if (dbus_message_append_args(_signal,
 551                                      DBUS_TYPE_BOOLEAN, &scanning,
 552                                      DBUS_TYPE_INVALID)) {
 553                 dbus_connection_send(iface->con, _signal, NULL);
 554         } else {
 555                 perror("wpa_supplicant_dbus_notify_scanning[dbus]: not enough "
 556                        "memory to construct signal.");
 557                 wpa_printf(MSG_ERROR, "%s[dbus]: not enough memory to "
 558                            "construct signal.", __FUNCTION__);
 559         }
 560         dbus_message_unref(_signal);
 561 }
 562
 563
 564 #ifdef CONFIG_WPS
 565 void wpa_supplicant_dbus_notify_wps_cred(struct wpa_supplicant *wpa_s,
 566                                          const struct wps_credential *cred)
 567 {
 568         struct wpas_dbus_priv *iface;
 569         DBusMessage *_signal = NULL;
 570         const char *path;
 571
 572         /* Do nothing if the control interface is not turned on */
 573         if (wpa_s->global == NULL)
 574                 return;
 575         iface = wpa_s->global->dbus;
 576         if (iface == NULL)
 577                 return;
 578
 579         path = wpa_supplicant_get_dbus_path(wpa_s);
 580         if (path == NULL) {
 581                 perror("wpa_supplicant_dbus_notify_wps_cred[dbus]: "
 582                        "interface didn't have a dbus path");
 583                 wpa_printf(MSG_ERROR,
 584                            "wpa_supplicant_dbus_notify_wps_cred[dbus]: "
 585                            "interface didn't have a dbus path; can't send "
 586                            "signal.");
 587                 return;
 588         }
 589         _signal = dbus_message_new_signal(path, WPAS_DBUS_IFACE_INTERFACE,
 590                                           "WpsCred");
 591         if (_signal == NULL) {
 592                 perror("wpa_supplicant_dbus_notify_wps_cred[dbus]: "
 593                        "couldn't create dbus signal; likely out of memory");
 594                 wpa_printf(MSG_ERROR,
 595                            "wpa_supplicant_dbus_notify_wps_cred[dbus]: "
 596                            "couldn't create dbus signal; likely out of "
 597                            "memory.");
 598                 return;
 599         }
 600
 601         if (!dbus_message_append_args(_signal,
 602                                       DBUS_TYPE_ARRAY, DBUS_TYPE_BYTE,
 603                                       &cred->cred_attr, cred->cred_attr_len,
 604                                       DBUS_TYPE_INVALID)) {
 605                 perror("wpa_supplicant_dbus_notify_wps_cred[dbus]: "
 606                        "not enough memory to construct signal.");
 607                 wpa_printf(MSG_ERROR,
 608                            "wpa_supplicant_dbus_notify_wps_cred[dbus]: "
 609                            "not enough memory to construct signal.");
 610                 goto out;
 611         }
 612
 613         dbus_connection_send(iface->con, _signal, NULL);
 614
 615 out:
 616         dbus_message_unref(_signal);
 617 }
 618 #else /* CONFIG_WPS */
 619 void wpa_supplicant_dbus_notify_wps_cred(struct wpa_supplicant *wpa_s,
 620                                          const struct wps_credential *cred)
 621 {
 622 }
 623 #endif /* CONFIG_WPS */
 624
 625
 626 /**
 627  * wpa_supplicant_dbus_ctrl_iface_init - Initialize dbus control interface
 628  * @global: Pointer to global data from wpa_supplicant_init()
 629  * Returns: 0 on success, -1 on failure
 630  *
 631  * Initialize the dbus control interface and start receiving commands from
 632  * external programs over the bus.
 633  */
 634 int wpa_supplicant_dbus_ctrl_iface_init(struct wpas_dbus_priv *iface)
 635 {
 636         DBusError error;
 637         int ret = -1;
 638         DBusObjectPathVTable wpas_vtable = {
 639                 NULL, &wpas_message_handler, NULL, NULL, NULL, NULL
 640         };
 641
 642         /* Register the message handler for the global dbus interface */
 643         if (!dbus_connection_register_object_path(iface->con,
 644                                                   WPAS_DBUS_PATH, &wpas_vtable,
 645                                                   iface)) {
 646                 perror("dbus_connection_register_object_path[dbus]");
 647                 wpa_printf(MSG_ERROR, "Could not set up DBus message "
 648                            "handler.");
 649                 return -1;
 650         }
 651
 652         /* Register our service with the message bus */
 653         dbus_error_init(&error);
 654         switch (dbus_bus_request_name(iface->con, WPAS_DBUS_SERVICE,
 655                                       0, &error)) {
 656         case DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER:
 657                 ret = 0;
 658                 break;
 659         case DBUS_REQUEST_NAME_REPLY_EXISTS:
 660         case DBUS_REQUEST_NAME_REPLY_IN_QUEUE:
 661         case DBUS_REQUEST_NAME_REPLY_ALREADY_OWNER:
 662                 perror("dbus_bus_request_name[dbus]");
 663                 wpa_printf(MSG_ERROR, "Could not request DBus service name: "
 664                            "already registered.");
 665                 break;
 666         default:
 667                 perror("dbus_bus_request_name[dbus]");
 668                 wpa_printf(MSG_ERROR, "Could not request DBus service name: "
 669                            "%s %s.", error.name, error.message);
 670                 break;
 671         }
 672         dbus_error_free(&error);
 673
 674         if (ret != 0)
 675                 return -1;
 676
 677         wpa_printf(MSG_DEBUG, "Providing DBus service '" WPAS_DBUS_SERVICE
 678                    "'.");
 679
 680         return 0;
 681 }
 682
 683
 684 /**
 685  * wpas_dbus_register_new_iface - Register a new interface with dbus
 686  * @wpa_s: %wpa_supplicant interface description structure to register
 687  * Returns: 0 on success, -1 on error
 688  *
 689  * Registers a new interface with dbus and assigns it a dbus object path.
 690  */
 691 int wpas_dbus_register_iface(struct wpa_supplicant *wpa_s)
 692 {
 693         struct wpas_dbus_priv *ctrl_iface = wpa_s->global->dbus;
 694         DBusConnection * con;
 695         u32 next;
 696         DBusObjectPathVTable vtable = {
 697                 NULL, &wpas_iface_message_handler, NULL, NULL, NULL, NULL
 698         };
 699         char *path;
 700         int ret = -1;
 701
 702         /* Do nothing if the control interface is not turned on */
 703         if (ctrl_iface == NULL)
 704                 return 0;
 705
 706         con = ctrl_iface->con;
 707         next = ctrl_iface->next_objid++;
 708
 709         /* Create and set the interface's object path */
 710         path = os_zalloc(WPAS_DBUS_OBJECT_PATH_MAX);
 711         if (path == NULL)
 712                 return -1;
 713         snprintf(path, WPAS_DBUS_OBJECT_PATH_MAX,
 714                  WPAS_DBUS_PATH_INTERFACES "/%u",
 715                  next);
 716         if (wpa_supplicant_set_dbus_path(wpa_s, path)) {
 717                 wpa_printf(MSG_DEBUG,
 718                            "Failed to set dbus path for interface %s",
 719                            wpa_s->ifname);
 720                 goto out;
 721         }
 722
 723         /* Register the message handler for the interface functions */
 724         if (!dbus_connection_register_fallback(con, path, &vtable, wpa_s)) {
 725                 perror("wpas_dbus_register_iface [dbus]");
 726                 wpa_printf(MSG_ERROR, "Could not set up DBus message "
 727                            "handler for interface %s.", wpa_s->ifname);
 728                 goto out;
 729         }
 730         ret = 0;
 731
 732 out:
 733         os_free(path);
 734         return ret;
 735 }
 736
 737
 738 /**
 739  * wpas_dbus_unregister_iface - Unregister an interface from dbus
 740  * @wpa_s: wpa_supplicant interface structure
 741  * Returns: 0 on success, -1 on failure
 742  *
 743  * Unregisters the interface with dbus
 744  */
 745 int wpas_dbus_unregister_iface(struct wpa_supplicant *wpa_s)
 746 {
 747         struct wpas_dbus_priv *ctrl_iface;
 748         DBusConnection *con;
 749         const char *path;
 750
 751         /* Do nothing if the control interface is not turned on */
 752         if (wpa_s == NULL || wpa_s->global == NULL)
 753                 return 0;
 754         ctrl_iface = wpa_s->global->dbus;
 755         if (ctrl_iface == NULL)
 756                 return 0;
 757
 758         con = ctrl_iface->con;
 759         path = wpa_supplicant_get_dbus_path(wpa_s);
 760
 761         if (!dbus_connection_unregister_object_path(con, path))
 762                 return -1;
 763
 764         os_free(wpa_s->dbus_path);
 765         wpa_s->dbus_path = NULL;
 766
 767         return 0;
 768 }
 769
 770
 771 /**
 772  * wpa_supplicant_get_iface_by_dbus_path - Get a new network interface
 773  * @global: Pointer to global data from wpa_supplicant_init()
 774  * @path: Pointer to a dbus object path representing an interface
 775  * Returns: Pointer to the interface or %NULL if not found
 776  */
 777 struct wpa_supplicant * wpa_supplicant_get_iface_by_dbus_path(
 778         struct wpa_global *global, const char *path)
 779 {
 780         struct wpa_supplicant *wpa_s;
 781
 782         for (wpa_s = global->ifaces; wpa_s; wpa_s = wpa_s->next) {
 783                 if (strcmp(wpa_s->dbus_path, path) == 0)
 784                         return wpa_s;
 785         }
 786         return NULL;
 787 }
 788
 789
 790 /**
 791  * wpa_supplicant_set_dbus_path - Assign a dbus path to an interface
 792  * @wpa_s: wpa_supplicant interface structure
 793  * @path: dbus path to set on the interface
 794  * Returns: 0 on succes, -1 on error
 795  */
 796 int wpa_supplicant_set_dbus_path(struct wpa_supplicant *wpa_s,
 797                                   const char *path)
 798 {
 799         u32 len = strlen (path);
 800         if (len >= WPAS_DBUS_OBJECT_PATH_MAX)
 801                 return -1;
 802         if (wpa_s->dbus_path)
 803                 return -1;
 804         wpa_s->dbus_path = os_strdup(path);
 805         return 0;
 806 }
 807
 808
 809 /**
 810  * wpa_supplicant_get_dbus_path - Get an interface's dbus path
 811  * @wpa_s: %wpa_supplicant interface structure
 812  * Returns: Interface's dbus object path, or %NULL on error
 813  */
 814 const char * wpa_supplicant_get_dbus_path(struct wpa_supplicant *wpa_s)
 815 {
 816         return wpa_s->dbus_path;
 817 }