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 "wps/wps.h"
  21 #include "../config.h"
  22 #include "../wpa_supplicant_i.h"
  23 #include "../bss.h"
  24 #include "dbus_old.h"
  25 #include "dbus_old_handlers.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_txt)
 179 {
 180         u8 bssid[ETH_ALEN];
 181         struct wpa_bss *bss;
 182
 183         if (hexstr2bin(bssid_txt, bssid, ETH_ALEN) < 0)
 184                 return wpas_dbus_new_invalid_bssid_error(message);
 185
 186         bss = wpa_bss_get_bssid(wpa_s, bssid);
 187         if (bss == NULL)
 188                 return wpas_dbus_new_invalid_bssid_error(message);
 189
 190         /* Dispatch the method call against the scanned bssid */
 191         if (os_strcmp(dbus_message_get_member(message), "properties") == 0)
 192                 return wpas_dbus_bssid_properties(message, wpa_s, bss);
 193
 194         return NULL;
 195 }
 196
 197
 198 /**
 199  * wpas_iface_message_handler - Dispatch messages for interfaces or networks
 200  * @connection: Connection to the system message bus
 201  * @message: An incoming dbus message
 202  * @user_data: A pointer to a dbus control interface data structure
 203  * Returns: Whether or not the message was handled
 204  *
 205  * This function dispatches all incoming dbus messages for network interfaces,
 206  * or objects owned by them, such as scanned BSSIDs and configured networks.
 207  */
 208 static DBusHandlerResult wpas_iface_message_handler(DBusConnection *connection,
 209                                                     DBusMessage *message,
 210                                                     void *user_data)
 211 {
 212         struct wpa_supplicant *wpa_s = user_data;
 213         const char *method = dbus_message_get_member(message);
 214         const char *path = dbus_message_get_path(message);
 215         const char *msg_interface = dbus_message_get_interface(message);
 216         char *iface_obj_path = NULL;
 217         char *network = NULL;
 218         char *bssid = NULL;
 219         DBusMessage *reply = NULL;
 220
 221         /* Caller must specify a message interface */
 222         if (!msg_interface)
 223                 goto out;
 224
 225         iface_obj_path = wpas_dbus_decompose_object_path(path, &network,
 226                                                          &bssid);
 227         if (iface_obj_path == NULL) {
 228                 reply = wpas_dbus_new_invalid_iface_error(message);
 229                 goto out;
 230         }
 231
 232         /* Make sure the message's object path actually refers to the
 233          * wpa_supplicant structure it's supposed to (which is wpa_s)
 234          */
 235         if (wpa_supplicant_get_iface_by_dbus_path(wpa_s->global,
 236                                                   iface_obj_path) != wpa_s) {
 237                 reply = wpas_dbus_new_invalid_iface_error(message);
 238                 goto out;
 239         }
 240
 241         if (network && !strcmp(msg_interface, WPAS_DBUS_IFACE_NETWORK)) {
 242                 /* A method for one of this interface's configured networks */
 243                 int nid = strtoul(network, NULL, 10);
 244                 if (errno != EINVAL)
 245                         reply = wpas_dispatch_network_method(message, wpa_s,
 246                                                              nid);
 247                 else
 248                         reply = wpas_dbus_new_invalid_network_error(message);
 249         } else if (bssid && !strcmp(msg_interface, WPAS_DBUS_IFACE_BSSID)) {
 250                 /* A method for one of this interface's scanned BSSIDs */
 251                 reply = wpas_dispatch_bssid_method(message, wpa_s, bssid);
 252         } else if (!strcmp(msg_interface, WPAS_DBUS_IFACE_INTERFACE)) {
 253                 /* A method for an interface only. */
 254                 if (!strcmp(method, "scan"))
 255                         reply = wpas_dbus_iface_scan(message, wpa_s);
 256                 else if (!strcmp(method, "scanResults"))
 257                         reply = wpas_dbus_iface_scan_results(message, wpa_s);
 258                 else if (!strcmp(method, "addNetwork"))
 259                         reply = wpas_dbus_iface_add_network(message, wpa_s);
 260                 else if (!strcmp(method, "removeNetwork"))
 261                         reply = wpas_dbus_iface_remove_network(message, wpa_s);
 262                 else if (!strcmp(method, "selectNetwork"))
 263                         reply = wpas_dbus_iface_select_network(message, wpa_s);
 264                 else if (!strcmp(method, "capabilities"))
 265                         reply = wpas_dbus_iface_capabilities(message, wpa_s);
 266                 else if (!strcmp(method, "disconnect"))
 267                         reply = wpas_dbus_iface_disconnect(message, wpa_s);
 268                 else if (!strcmp(method, "setAPScan"))
 269                         reply = wpas_dbus_iface_set_ap_scan(message, wpa_s);
 270                 else if (!strcmp(method, "setSmartcardModules"))
 271                         reply = wpas_dbus_iface_set_smartcard_modules(message,
 272                                                                       wpa_s);
 273                 else if (!strcmp(method, "state"))
 274                         reply = wpas_dbus_iface_get_state(message, wpa_s);
 275                 else if (!strcmp(method, "scanning"))
 276                         reply = wpas_dbus_iface_get_scanning(message, wpa_s);
 277                 else if (!strcmp(method, "setBlobs"))
 278                         reply = wpas_dbus_iface_set_blobs(message, wpa_s);
 279                 else if (!strcmp(method, "removeBlobs"))
 280                         reply = wpas_dbus_iface_remove_blobs(message, wpa_s);
 281 #ifdef CONFIG_WPS
 282                 else if (!os_strcmp(method, "wpsPbc"))
 283                         reply = wpas_dbus_iface_wps_pbc(message, wpa_s);
 284                 else if (!os_strcmp(method, "wpsPin"))
 285                         reply = wpas_dbus_iface_wps_pin(message, wpa_s);
 286                 else if (!os_strcmp(method, "wpsReg"))
 287                         reply = wpas_dbus_iface_wps_reg(message, wpa_s);
 288 #endif /* CONFIG_WPS */
 289                 else if (!os_strcmp(method, "flush"))
 290                         reply = wpas_dbus_iface_flush(message, wpa_s);
 291         }
 292
 293         /* If the message was handled, send back the reply */
 294         if (reply) {
 295                 if (!dbus_message_get_no_reply(message))
 296                         dbus_connection_send(connection, reply, NULL);
 297                 dbus_message_unref(reply);
 298         }
 299
 300 out:
 301         os_free(iface_obj_path);
 302         os_free(network);
 303         os_free(bssid);
 304         return reply ? DBUS_HANDLER_RESULT_HANDLED :
 305                 DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 306 }
 307
 308
 309 /**
 310  * wpas_message_handler - dispatch incoming dbus messages
 311  * @connection: connection to the system message bus
 312  * @message: an incoming dbus message
 313  * @user_data: a pointer to a dbus control interface data structure
 314  * Returns: whether or not the message was handled
 315  *
 316  * This function dispatches all incoming dbus messages to the correct
 317  * handlers, depending on what the message's target object path is,
 318  * and what the method call is.
 319  */
 320 static DBusHandlerResult wpas_message_handler(DBusConnection *connection,
 321         DBusMessage *message, void *user_data)
 322 {
 323         struct wpas_dbus_priv *ctrl_iface = user_data;
 324         const char *method;
 325         const char *path;
 326         const char *msg_interface;
 327         DBusMessage *reply = NULL;
 328
 329         method = dbus_message_get_member(message);
 330         path = dbus_message_get_path(message);
 331         msg_interface = dbus_message_get_interface(message);
 332         if (!method || !path || !ctrl_iface || !msg_interface)
 333                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 334
 335         /* Validate the method interface */
 336         if (strcmp(msg_interface, WPAS_DBUS_INTERFACE) != 0)
 337                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 338
 339         if (!strcmp(path, WPAS_DBUS_PATH)) {
 340                 /* dispatch methods against our global dbus interface here */
 341                 if (!strcmp(method, "addInterface")) {
 342                         reply = wpas_dbus_global_add_interface(
 343                                 message, ctrl_iface->global);
 344                 } else if (!strcmp(method, "removeInterface")) {
 345                         reply = wpas_dbus_global_remove_interface(
 346                                 message, ctrl_iface->global);
 347                 } else if (!strcmp(method, "getInterface")) {
 348                         reply = wpas_dbus_global_get_interface(
 349                                 message, ctrl_iface->global);
 350                 } else if (!strcmp(method, "setDebugParams")) {
 351                         reply = wpas_dbus_global_set_debugparams(
 352                                 message, ctrl_iface->global);
 353                 }
 354         }
 355
 356         /* If the message was handled, send back the reply */
 357         if (reply) {
 358                 if (!dbus_message_get_no_reply(message))
 359                         dbus_connection_send(connection, reply, NULL);
 360                 dbus_message_unref(reply);
 361         }
 362
 363         return reply ? DBUS_HANDLER_RESULT_HANDLED :
 364                 DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 365 }
 366
 367
 368 /**
 369  * wpa_supplicant_dbus_notify_scan_results - Send a scan results signal
 370  * @wpa_s: %wpa_supplicant network interface data
 371  * Returns: 0 on success, -1 on failure
 372  *
 373  * Notify listeners that this interface has updated scan results.
 374  */
 375 void wpa_supplicant_dbus_notify_scan_results(struct wpa_supplicant *wpa_s)
 376 {
 377         struct wpas_dbus_priv *iface = wpa_s->global->dbus;
 378         DBusMessage *_signal;
 379
 380         /* Do nothing if the control interface is not turned on */
 381         if (iface == NULL)
 382                 return;
 383
 384         _signal = dbus_message_new_signal(wpa_s->dbus_path,
 385                                           WPAS_DBUS_IFACE_INTERFACE,
 386                                           "ScanResultsAvailable");
 387         if (_signal == NULL) {
 388                 wpa_printf(MSG_ERROR, "dbus: Not enough memory to send scan "
 389                            "results signal");
 390                 return;
 391         }
 392         dbus_connection_send(iface->con, _signal, NULL);
 393         dbus_message_unref(_signal);
 394 }
 395
 396
 397 /**
 398  * wpa_supplicant_dbus_notify_state_change - Send a state change signal
 399  * @wpa_s: %wpa_supplicant network interface data
 400  * @new_state: new state wpa_supplicant is entering
 401  * @old_state: old state wpa_supplicant is leaving
 402  * Returns: 0 on success, -1 on failure
 403  *
 404  * Notify listeners that wpa_supplicant has changed state
 405  */
 406 void wpa_supplicant_dbus_notify_state_change(struct wpa_supplicant *wpa_s,
 407                                              enum wpa_states new_state,
 408                                              enum wpa_states old_state)
 409 {
 410         struct wpas_dbus_priv *iface;
 411         DBusMessage *_signal = NULL;
 412         const char *new_state_str, *old_state_str;
 413
 414         if (wpa_s->dbus_path == NULL)
 415                 return; /* Skip signal since D-Bus setup is not yet ready */
 416
 417         /* Do nothing if the control interface is not turned on */
 418         if (wpa_s->global == NULL)
 419                 return;
 420         iface = wpa_s->global->dbus;
 421         if (iface == NULL)
 422                 return;
 423
 424         /* Only send signal if state really changed */
 425         if (new_state == old_state)
 426                 return;
 427
 428         _signal = dbus_message_new_signal(wpa_s->dbus_path,
 429                                           WPAS_DBUS_IFACE_INTERFACE,
 430                                           "StateChange");
 431         if (_signal == NULL) {
 432                 wpa_printf(MSG_ERROR,
 433                            "dbus: wpa_supplicant_dbus_notify_state_change: "
 434                            "could not create dbus signal; likely out of "
 435                            "memory");
 436                 return;
 437         }
 438
 439         new_state_str = wpa_supplicant_state_txt(new_state);
 440         old_state_str = wpa_supplicant_state_txt(old_state);
 441         if (new_state_str == NULL || old_state_str == NULL) {
 442                 wpa_printf(MSG_ERROR,
 443                            "dbus: wpa_supplicant_dbus_notify_state_change: "
 444                            "Could not convert state strings");
 445                 goto out;
 446         }
 447
 448         if (!dbus_message_append_args(_signal,
 449                                       DBUS_TYPE_STRING, &new_state_str,
 450                                       DBUS_TYPE_STRING, &old_state_str,
 451                                       DBUS_TYPE_INVALID)) {
 452                 wpa_printf(MSG_ERROR,
 453                            "dbus: wpa_supplicant_dbus_notify_state_change: "
 454                            "Not enough memory to construct state change "
 455                            "signal");
 456                 goto out;
 457         }
 458
 459         dbus_connection_send(iface->con, _signal, NULL);
 460
 461 out:
 462         dbus_message_unref(_signal);
 463 }
 464
 465
 466 /**
 467  * wpa_supplicant_dbus_notify_scanning - send scanning status
 468  * @wpa_s: %wpa_supplicant network interface data
 469  * Returns: 0 on success, -1 on failure
 470  *
 471  * Notify listeners of interface scanning state changes
 472  */
 473 void wpa_supplicant_dbus_notify_scanning(struct wpa_supplicant *wpa_s)
 474 {
 475         struct wpas_dbus_priv *iface = wpa_s->global->dbus;
 476         DBusMessage *_signal;
 477         dbus_bool_t scanning = wpa_s->scanning ? TRUE : FALSE;
 478
 479         /* Do nothing if the control interface is not turned on */
 480         if (iface == NULL)
 481                 return;
 482
 483         _signal = dbus_message_new_signal(wpa_s->dbus_path,
 484                                           WPAS_DBUS_IFACE_INTERFACE,
 485                                           "Scanning");
 486         if (_signal == NULL) {
 487                 wpa_printf(MSG_ERROR, "dbus: Not enough memory to send scan "
 488                            "results signal");
 489                 return;
 490         }
 491
 492         if (dbus_message_append_args(_signal,
 493                                      DBUS_TYPE_BOOLEAN, &scanning,
 494                                      DBUS_TYPE_INVALID)) {
 495                 dbus_connection_send(iface->con, _signal, NULL);
 496         } else {
 497                 wpa_printf(MSG_ERROR, "dbus: Not enough memory to construct "
 498                            "signal");
 499         }
 500         dbus_message_unref(_signal);
 501 }
 502
 503
 504 #ifdef CONFIG_WPS
 505 void wpa_supplicant_dbus_notify_wps_cred(struct wpa_supplicant *wpa_s,
 506                                          const struct wps_credential *cred)
 507 {
 508         struct wpas_dbus_priv *iface;
 509         DBusMessage *_signal = NULL;
 510
 511         /* Do nothing if the control interface is not turned on */
 512         if (wpa_s->global == NULL)
 513                 return;
 514         iface = wpa_s->global->dbus;
 515         if (iface == NULL)
 516                 return;
 517
 518         _signal = dbus_message_new_signal(wpa_s->dbus_path,
 519                                           WPAS_DBUS_IFACE_INTERFACE,
 520                                           "WpsCred");
 521         if (_signal == NULL) {
 522                 wpa_printf(MSG_ERROR,
 523                            "dbus: wpa_supplicant_dbus_notify_wps_cred: "
 524                            "Could not create dbus signal; likely out of "
 525                            "memory");
 526                 return;
 527         }
 528
 529         if (!dbus_message_append_args(_signal,
 530                                       DBUS_TYPE_ARRAY, DBUS_TYPE_BYTE,
 531                                       &cred->cred_attr, cred->cred_attr_len,
 532                                       DBUS_TYPE_INVALID)) {
 533                 wpa_printf(MSG_ERROR,
 534                            "dbus: wpa_supplicant_dbus_notify_wps_cred: "
 535                            "Not enough memory to construct signal");
 536                 goto out;
 537         }
 538
 539         dbus_connection_send(iface->con, _signal, NULL);
 540
 541 out:
 542         dbus_message_unref(_signal);
 543 }
 544 #else /* CONFIG_WPS */
 545 void wpa_supplicant_dbus_notify_wps_cred(struct wpa_supplicant *wpa_s,
 546                                          const struct wps_credential *cred)
 547 {
 548 }
 549 #endif /* CONFIG_WPS */
 550
 551 void wpa_supplicant_dbus_notify_certification(struct wpa_supplicant *wpa_s,
 552                                               int depth, const char *subject,
 553                                               const char *cert_hash,
 554                                               const struct wpabuf *cert)
 555 {
 556         struct wpas_dbus_priv *iface;
 557         DBusMessage *_signal = NULL;
 558         const char *hash;
 559         const char *cert_hex;
 560         int cert_hex_len;
 561
 562         /* Do nothing if the control interface is not turned on */
 563         if (wpa_s->global == NULL)
 564                 return;
 565         iface = wpa_s->global->dbus;
 566         if (iface == NULL)
 567                 return;
 568
 569         _signal = dbus_message_new_signal(wpa_s->dbus_path,
 570                                           WPAS_DBUS_IFACE_INTERFACE,
 571                                           "Certification");
 572         if (_signal == NULL) {
 573                 wpa_printf(MSG_ERROR,
 574                            "dbus: wpa_supplicant_dbus_notify_certification: "
 575                            "Could not create dbus signal; likely out of "
 576                            "memory");
 577                 return;
 578         }
 579
 580         hash = cert_hash ? cert_hash : "";
 581         cert_hex = cert ? wpabuf_head(cert) : "";
 582         cert_hex_len = cert ? wpabuf_len(cert) : 0;
 583
 584         if (!dbus_message_append_args(_signal,
 585                                       DBUS_TYPE_INT32,&depth,
 586                                       DBUS_TYPE_STRING, &subject,
 587                                       DBUS_TYPE_STRING, &hash,
 588                                       DBUS_TYPE_ARRAY, DBUS_TYPE_BYTE,
 589                                       &cert_hex, cert_hex_len,
 590                                       DBUS_TYPE_INVALID)) {
 591                 wpa_printf(MSG_ERROR,
 592                            "dbus: wpa_supplicant_dbus_notify_certification: "
 593                            "Not enough memory to construct signal");
 594                 goto out;
 595         }
 596
 597         dbus_connection_send(iface->con, _signal, NULL);
 598
 599 out:
 600         dbus_message_unref(_signal);
 601
 602 }
 603
 604
 605 /**
 606  * wpa_supplicant_dbus_ctrl_iface_init - Initialize dbus control interface
 607  * @global: Pointer to global data from wpa_supplicant_init()
 608  * Returns: 0 on success, -1 on failure
 609  *
 610  * Initialize the dbus control interface and start receiving commands from
 611  * external programs over the bus.
 612  */
 613 int wpa_supplicant_dbus_ctrl_iface_init(struct wpas_dbus_priv *iface)
 614 {
 615         DBusError error;
 616         int ret = -1;
 617         DBusObjectPathVTable wpas_vtable = {
 618                 NULL, &wpas_message_handler, NULL, NULL, NULL, NULL
 619         };
 620
 621         /* Register the message handler for the global dbus interface */
 622         if (!dbus_connection_register_object_path(iface->con,
 623                                                   WPAS_DBUS_PATH, &wpas_vtable,
 624                                                   iface)) {
 625                 wpa_printf(MSG_ERROR, "dbus: Could not set up message "
 626                            "handler");
 627                 return -1;
 628         }
 629
 630         /* Register our service with the message bus */
 631         dbus_error_init(&error);
 632         switch (dbus_bus_request_name(iface->con, WPAS_DBUS_SERVICE,
 633                                       0, &error)) {
 634         case DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER:
 635                 ret = 0;
 636                 break;
 637         case DBUS_REQUEST_NAME_REPLY_EXISTS:
 638         case DBUS_REQUEST_NAME_REPLY_IN_QUEUE:
 639         case DBUS_REQUEST_NAME_REPLY_ALREADY_OWNER:
 640                 wpa_printf(MSG_ERROR, "dbus: Could not request service name: "
 641                            "already registered");
 642                 break;
 643         default:
 644                 wpa_printf(MSG_ERROR, "dbus: Could not request service name: "
 645                            "%s %s", error.name, error.message);
 646                 break;
 647         }
 648         dbus_error_free(&error);
 649
 650         if (ret != 0)
 651                 return -1;
 652
 653         wpa_printf(MSG_DEBUG, "Providing DBus service '" WPAS_DBUS_SERVICE
 654                    "'.");
 655
 656         return 0;
 657 }
 658
 659
 660 /**
 661  * wpas_dbus_register_new_iface - Register a new interface with dbus
 662  * @wpa_s: %wpa_supplicant interface description structure to register
 663  * Returns: 0 on success, -1 on error
 664  *
 665  * Registers a new interface with dbus and assigns it a dbus object path.
 666  */
 667 int wpas_dbus_register_iface(struct wpa_supplicant *wpa_s)
 668 {
 669         struct wpas_dbus_priv *ctrl_iface = wpa_s->global->dbus;
 670         DBusConnection * con;
 671         u32 next;
 672         DBusObjectPathVTable vtable = {
 673                 NULL, &wpas_iface_message_handler, NULL, NULL, NULL, NULL
 674         };
 675
 676         /* Do nothing if the control interface is not turned on */
 677         if (ctrl_iface == NULL)
 678                 return 0;
 679
 680         con = ctrl_iface->con;
 681         next = ctrl_iface->next_objid++;
 682
 683         /* Create and set the interface's object path */
 684         wpa_s->dbus_path = os_zalloc(WPAS_DBUS_OBJECT_PATH_MAX);
 685         if (wpa_s->dbus_path == NULL)
 686                 return -1;
 687         os_snprintf(wpa_s->dbus_path, WPAS_DBUS_OBJECT_PATH_MAX,
 688                     WPAS_DBUS_PATH_INTERFACES "/%u",
 689                     next);
 690
 691         /* Register the message handler for the interface functions */
 692         if (!dbus_connection_register_fallback(con, wpa_s->dbus_path, &vtable,
 693                                                wpa_s)) {
 694                 wpa_printf(MSG_ERROR, "dbus: Could not set up message "
 695                            "handler for interface %s", wpa_s->ifname);
 696                 return -1;
 697         }
 698
 699         return 0;
 700 }
 701
 702
 703 /**
 704  * wpas_dbus_unregister_iface - Unregister an interface from dbus
 705  * @wpa_s: wpa_supplicant interface structure
 706  * Returns: 0 on success, -1 on failure
 707  *
 708  * Unregisters the interface with dbus
 709  */
 710 int wpas_dbus_unregister_iface(struct wpa_supplicant *wpa_s)
 711 {
 712         struct wpas_dbus_priv *ctrl_iface;
 713         DBusConnection *con;
 714
 715         /* Do nothing if the control interface is not turned on */
 716         if (wpa_s == NULL || wpa_s->global == NULL)
 717                 return 0;
 718         ctrl_iface = wpa_s->global->dbus;
 719         if (ctrl_iface == NULL)
 720                 return 0;
 721
 722         con = ctrl_iface->con;
 723         if (!dbus_connection_unregister_object_path(con, wpa_s->dbus_path))
 724                 return -1;
 725
 726         os_free(wpa_s->dbus_path);
 727         wpa_s->dbus_path = NULL;
 728
 729         return 0;
 730 }
 731
 732
 733 /**
 734  * wpa_supplicant_get_iface_by_dbus_path - Get a new network interface
 735  * @global: Pointer to global data from wpa_supplicant_init()
 736  * @path: Pointer to a dbus object path representing an interface
 737  * Returns: Pointer to the interface or %NULL if not found
 738  */
 739 struct wpa_supplicant * wpa_supplicant_get_iface_by_dbus_path(
 740         struct wpa_global *global, const char *path)
 741 {
 742         struct wpa_supplicant *wpa_s;
 743
 744         for (wpa_s = global->ifaces; wpa_s; wpa_s = wpa_s->next) {
 745                 if (strcmp(wpa_s->dbus_path, path) == 0)
 746                         return wpa_s;
 747         }
 748         return NULL;
 749 }