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