git.maemo.org Git - wpasupplicant/blob - wpa_supplicant/ctrl_iface_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 "config.h"
  20 #include "wpa_supplicant_i.h"
  21 #include "drivers/driver.h"
  22 #include "wps/wps.h"
  23 #include "ctrl_iface_dbus.h"
  24 #include "ctrl_iface_dbus_handlers.h"
  25
  26 #define _DBUS_VERSION (DBUS_VERSION_MAJOR << 8 | DBUS_VERSION_MINOR)
  27 #define DBUS_VER(major, minor) ((major) << 8 | (minor))
  28
  29 #if _DBUS_VERSION < DBUS_VER(1,1)
  30 #define dbus_watch_get_unix_fd dbus_watch_get_fd
  31 #endif
  32
  33
  34 struct ctrl_iface_dbus_priv {
  35         DBusConnection *con;
  36         int should_dispatch;
  37         struct wpa_global *global;
  38
  39         u32 next_objid;
  40 };
  41
  42
  43 static void process_watch(struct ctrl_iface_dbus_priv *iface,
  44                           DBusWatch *watch, eloop_event_type type)
  45 {
  46         dbus_connection_ref(iface->con);
  47
  48         iface->should_dispatch = 0;
  49
  50         if (type == EVENT_TYPE_READ)
  51                 dbus_watch_handle(watch, DBUS_WATCH_READABLE);
  52         else if (type == EVENT_TYPE_WRITE)
  53                 dbus_watch_handle(watch, DBUS_WATCH_WRITABLE);
  54         else if (type == EVENT_TYPE_EXCEPTION)
  55                 dbus_watch_handle(watch, DBUS_WATCH_ERROR);
  56
  57         if (iface->should_dispatch) {
  58                 while (dbus_connection_get_dispatch_status(iface->con) ==
  59                        DBUS_DISPATCH_DATA_REMAINS)
  60                         dbus_connection_dispatch(iface->con);
  61                 iface->should_dispatch = 0;
  62         }
  63
  64         dbus_connection_unref(iface->con);
  65 }
  66
  67
  68 static void process_watch_exception(int sock, void *eloop_ctx, void *sock_ctx)
  69 {
  70         process_watch(eloop_ctx, sock_ctx, EVENT_TYPE_EXCEPTION);
  71 }
  72
  73
  74 static void process_watch_read(int sock, void *eloop_ctx, void *sock_ctx)
  75 {
  76         process_watch(eloop_ctx, sock_ctx, EVENT_TYPE_READ);
  77 }
  78
  79
  80 static void process_watch_write(int sock, void *eloop_ctx, void *sock_ctx)
  81 {
  82         process_watch(eloop_ctx, sock_ctx, EVENT_TYPE_WRITE);
  83 }
  84
  85
  86 static void connection_setup_add_watch(struct ctrl_iface_dbus_priv *iface,
  87                                        DBusWatch *watch)
  88 {
  89         unsigned int flags;
  90         int fd;
  91
  92         if (!dbus_watch_get_enabled(watch))
  93                 return;
  94
  95         flags = dbus_watch_get_flags(watch);
  96         fd = dbus_watch_get_unix_fd(watch);
  97
  98         eloop_register_sock(fd, EVENT_TYPE_EXCEPTION, process_watch_exception,
  99                             iface, watch);
 100
 101         if (flags & DBUS_WATCH_READABLE) {
 102                 eloop_register_sock(fd, EVENT_TYPE_READ, process_watch_read,
 103                                     iface, watch);
 104         }
 105         if (flags & DBUS_WATCH_WRITABLE) {
 106                 eloop_register_sock(fd, EVENT_TYPE_WRITE, process_watch_write,
 107                                     iface, watch);
 108         }
 109
 110         dbus_watch_set_data(watch, iface, NULL);
 111 }
 112
 113
 114 static void connection_setup_remove_watch(struct ctrl_iface_dbus_priv *iface,
 115                                           DBusWatch *watch)
 116 {
 117         unsigned int flags;
 118         int fd;
 119
 120         flags = dbus_watch_get_flags(watch);
 121         fd = dbus_watch_get_unix_fd(watch);
 122
 123         eloop_unregister_sock(fd, EVENT_TYPE_EXCEPTION);
 124
 125         if (flags & DBUS_WATCH_READABLE)
 126                 eloop_unregister_sock(fd, EVENT_TYPE_READ);
 127         if (flags & DBUS_WATCH_WRITABLE)
 128                 eloop_unregister_sock(fd, EVENT_TYPE_WRITE);
 129
 130         dbus_watch_set_data(watch, NULL, NULL);
 131 }
 132
 133
 134 static dbus_bool_t add_watch(DBusWatch *watch, void *data)
 135 {
 136         connection_setup_add_watch(data, watch);
 137         return TRUE;
 138 }
 139
 140
 141 static void remove_watch(DBusWatch *watch, void *data)
 142 {
 143         connection_setup_remove_watch(data, watch);
 144 }
 145
 146
 147 static void watch_toggled(DBusWatch *watch, void *data)
 148 {
 149         if (dbus_watch_get_enabled(watch))
 150                 add_watch(watch, data);
 151         else
 152                 remove_watch(watch, data);
 153 }
 154
 155
 156 static void process_timeout(void *eloop_ctx, void *sock_ctx)
 157 {
 158         DBusTimeout *timeout = sock_ctx;
 159
 160         dbus_timeout_handle(timeout);
 161 }
 162
 163
 164 static void connection_setup_add_timeout(struct ctrl_iface_dbus_priv *iface,
 165                                          DBusTimeout *timeout)
 166 {
 167         if (!dbus_timeout_get_enabled(timeout))
 168                 return;
 169
 170         eloop_register_timeout(0, dbus_timeout_get_interval(timeout) * 1000,
 171                                process_timeout, iface, timeout);
 172
 173         dbus_timeout_set_data(timeout, iface, NULL);
 174 }
 175
 176
 177 static void connection_setup_remove_timeout(struct ctrl_iface_dbus_priv *iface,
 178                                             DBusTimeout *timeout)
 179 {
 180         eloop_cancel_timeout(process_timeout, iface, timeout);
 181         dbus_timeout_set_data(timeout, NULL, NULL);
 182 }
 183
 184
 185 static dbus_bool_t add_timeout(DBusTimeout *timeout, void *data)
 186 {
 187         if (!dbus_timeout_get_enabled(timeout))
 188                 return TRUE;
 189
 190         connection_setup_add_timeout(data, timeout);
 191
 192         return TRUE;
 193 }
 194
 195
 196 static void remove_timeout(DBusTimeout *timeout, void *data)
 197 {
 198         connection_setup_remove_timeout(data, timeout);
 199 }
 200
 201
 202 static void timeout_toggled(DBusTimeout *timeout, void *data)
 203 {
 204         if (dbus_timeout_get_enabled(timeout))
 205                 add_timeout(timeout, data);
 206         else
 207                 remove_timeout(timeout, data);
 208 }
 209
 210
 211 static void process_wakeup_main(int sig, void *eloop_ctx, void *signal_ctx)
 212 {
 213         struct ctrl_iface_dbus_priv *iface = signal_ctx;
 214
 215         if (sig != SIGPOLL || !iface->con)
 216                 return;
 217
 218         if (dbus_connection_get_dispatch_status(iface->con) !=
 219             DBUS_DISPATCH_DATA_REMAINS)
 220                 return;
 221
 222         /* Only dispatch once - we do not want to starve other events */
 223         dbus_connection_ref(iface->con);
 224         dbus_connection_dispatch(iface->con);
 225         dbus_connection_unref(iface->con);
 226 }
 227
 228
 229 /**
 230  * wakeup_main - Attempt to wake our mainloop up
 231  * @data: dbus control interface private data
 232  *
 233  * Try to wake up the main eloop so it will process
 234  * dbus events that may have happened.
 235  */
 236 static void wakeup_main(void *data)
 237 {
 238         struct ctrl_iface_dbus_priv *iface = data;
 239
 240         /* Use SIGPOLL to break out of the eloop select() */
 241         raise(SIGPOLL);
 242         iface->should_dispatch = 1;
 243 }
 244
 245
 246 /**
 247  * connection_setup_wakeup_main - Tell dbus about our wakeup_main function
 248  * @iface: dbus control interface private data
 249  * Returns: 0 on success, -1 on failure
 250  *
 251  * Register our wakeup_main handler with dbus
 252  */
 253 static int connection_setup_wakeup_main(struct ctrl_iface_dbus_priv *iface)
 254 {
 255         if (eloop_register_signal(SIGPOLL, process_wakeup_main, iface))
 256                 return -1;
 257
 258         dbus_connection_set_wakeup_main_function(iface->con, wakeup_main,
 259                                                  iface, NULL);
 260
 261         return 0;
 262 }
 263
 264
 265 /**
 266  * wpa_supplicant_dbus_next_objid - Return next available object id
 267  * @iface: dbus control interface private data
 268  * Returns: Object id
 269  */
 270 u32 wpa_supplicant_dbus_next_objid (struct ctrl_iface_dbus_priv *iface)
 271 {
 272         return iface->next_objid++;
 273 }
 274
 275
 276 /**
 277  * wpas_dbus_decompose_object_path - Decompose an interface object path into parts
 278  * @path: The dbus object path
 279  * @network: (out) the configured network this object path refers to, if any
 280  * @bssid: (out) the scanned bssid this object path refers to, if any
 281  * Returns: The object path of the network interface this path refers to
 282  *
 283  * For a given object path, decomposes the object path into object id, network,
 284  * and BSSID parts, if those parts exist.
 285  */
 286 char * wpas_dbus_decompose_object_path(const char *path, char **network,
 287                                        char **bssid)
 288 {
 289         const unsigned int dev_path_prefix_len =
 290                 strlen(WPAS_DBUS_PATH_INTERFACES "/");
 291         char *obj_path_only;
 292         char *next_sep;
 293
 294         /* Be a bit paranoid about path */
 295         if (!path || strncmp(path, WPAS_DBUS_PATH_INTERFACES "/",
 296                              dev_path_prefix_len))
 297                 return NULL;
 298
 299         /* Ensure there's something at the end of the path */
 300         if ((path + dev_path_prefix_len)[0] == '\0')
 301                 return NULL;
 302
 303         obj_path_only = strdup(path);
 304         if (obj_path_only == NULL)
 305                 return NULL;
 306
 307         next_sep = strchr(obj_path_only + dev_path_prefix_len, '/');
 308         if (next_sep != NULL) {
 309                 const char *net_part = strstr(next_sep,
 310                                               WPAS_DBUS_NETWORKS_PART "/");
 311                 const char *bssid_part = strstr(next_sep,
 312                                                 WPAS_DBUS_BSSIDS_PART "/");
 313
 314                 if (network && net_part) {
 315                         /* Deal with a request for a configured network */
 316                         const char *net_name = net_part +
 317                                 strlen(WPAS_DBUS_NETWORKS_PART "/");
 318                         *network = NULL;
 319                         if (strlen(net_name))
 320                                 *network = strdup(net_name);
 321                 } else if (bssid && bssid_part) {
 322                         /* Deal with a request for a scanned BSSID */
 323                         const char *bssid_name = bssid_part +
 324                                 strlen(WPAS_DBUS_BSSIDS_PART "/");
 325                         if (strlen(bssid_name))
 326                                 *bssid = strdup(bssid_name);
 327                         else
 328                                 *bssid = NULL;
 329                 }
 330
 331                 /* Cut off interface object path before "/" */
 332                 *next_sep = '\0';
 333         }
 334
 335         return obj_path_only;
 336 }
 337
 338
 339 /**
 340  * wpas_dbus_new_invalid_iface_error - Return a new invalid interface error message
 341  * @message: Pointer to incoming dbus message this error refers to
 342  * Returns: A dbus error message
 343  *
 344  * Convenience function to create and return an invalid interface error
 345  */
 346 DBusMessage * wpas_dbus_new_invalid_iface_error(DBusMessage *message)
 347 {
 348         return dbus_message_new_error(message, WPAS_ERROR_INVALID_IFACE,
 349                                       "wpa_supplicant knows nothing about "
 350                                       "this interface.");
 351 }
 352
 353
 354 /**
 355  * wpas_dbus_new_invalid_network_error - Return a new invalid network error message
 356  * @message: Pointer to incoming dbus message this error refers to
 357  * Returns: a dbus error message
 358  *
 359  * Convenience function to create and return an invalid network error
 360  */
 361 DBusMessage * wpas_dbus_new_invalid_network_error(DBusMessage *message)
 362 {
 363         return dbus_message_new_error(message, WPAS_ERROR_INVALID_NETWORK,
 364                                       "The requested network does not exist.");
 365 }
 366
 367
 368 /**
 369  * wpas_dbus_new_invalid_bssid_error - Return a new invalid bssid error message
 370  * @message: Pointer to incoming dbus message this error refers to
 371  * Returns: a dbus error message
 372  *
 373  * Convenience function to create and return an invalid bssid error
 374  */
 375 static DBusMessage * wpas_dbus_new_invalid_bssid_error(DBusMessage *message)
 376 {
 377         return dbus_message_new_error(message, WPAS_ERROR_INVALID_BSSID,
 378                                       "The BSSID requested was invalid.");
 379 }
 380
 381
 382 /**
 383  * wpas_dispatch_network_method - dispatch messages for configured networks
 384  * @message: the incoming dbus message
 385  * @wpa_s: a network interface's data
 386  * @network_id: id of the configured network we're interested in
 387  * Returns: a reply dbus message, or a dbus error message
 388  *
 389  * This function dispatches all incoming dbus messages for configured networks.
 390  */
 391 static DBusMessage * wpas_dispatch_network_method(DBusMessage *message,
 392                                                   struct wpa_supplicant *wpa_s,
 393                                                   int network_id)
 394 {
 395         DBusMessage *reply = NULL;
 396         const char *method = dbus_message_get_member(message);
 397         struct wpa_ssid *ssid;
 398
 399         ssid = wpa_config_get_network(wpa_s->conf, network_id);
 400         if (ssid == NULL)
 401                 return wpas_dbus_new_invalid_network_error(message);
 402
 403         if (!strcmp(method, "set"))
 404                 reply = wpas_dbus_iface_set_network(message, wpa_s, ssid);
 405         else if (!strcmp(method, "enable"))
 406                 reply = wpas_dbus_iface_enable_network(message, wpa_s, ssid);
 407         else if (!strcmp(method, "disable"))
 408                 reply = wpas_dbus_iface_disable_network(message, wpa_s, ssid);
 409
 410         return reply;
 411 }
 412
 413
 414 /**
 415  * wpas_dispatch_bssid_method - dispatch messages for scanned networks
 416  * @message: the incoming dbus message
 417  * @wpa_s: a network interface's data
 418  * @bssid: bssid of the scanned network we're interested in
 419  * Returns: a reply dbus message, or a dbus error message
 420  *
 421  * This function dispatches all incoming dbus messages for scanned networks.
 422  */
 423 static DBusMessage * wpas_dispatch_bssid_method(DBusMessage *message,
 424                                                 struct wpa_supplicant *wpa_s,
 425                                                 const char *bssid)
 426 {
 427         DBusMessage *reply = NULL;
 428         const char *method = dbus_message_get_member(message);
 429         struct wpa_scan_res *res = NULL;
 430         size_t i;
 431
 432         /* Ensure we actually have scan data */
 433         if (wpa_s->scan_res == NULL &&
 434             wpa_supplicant_get_scan_results(wpa_s) < 0) {
 435                 reply = wpas_dbus_new_invalid_bssid_error(message);
 436                 goto out;
 437         }
 438
 439         /* Find the bssid's scan data */
 440         for (i = 0; i < wpa_s->scan_res->num; i++) {
 441                 struct wpa_scan_res *search_res = wpa_s->scan_res->res[i];
 442                 char mac_str[18];
 443
 444                 memset(mac_str, 0, sizeof(mac_str));
 445                 snprintf(mac_str, sizeof(mac_str) - 1, WPAS_DBUS_BSSID_FORMAT,
 446                          MAC2STR(search_res->bssid));
 447                 if (!strcmp(bssid, mac_str)) {
 448                         res = search_res;
 449                         break;
 450                 }
 451         }
 452
 453         if (!res) {
 454                 reply = wpas_dbus_new_invalid_bssid_error(message);
 455                 goto out;
 456         }
 457
 458         /* Dispatch the method call against the scanned bssid */
 459         if (!strcmp(method, "properties"))
 460                 reply = wpas_dbus_bssid_properties(message, wpa_s, res);
 461
 462 out:
 463         return reply;
 464 }
 465
 466
 467 /**
 468  * wpas_iface_message_handler - Dispatch messages for interfaces or networks
 469  * @connection: Connection to the system message bus
 470  * @message: An incoming dbus message
 471  * @user_data: A pointer to a dbus control interface data structure
 472  * Returns: Whether or not the message was handled
 473  *
 474  * This function dispatches all incoming dbus messages for network interfaces,
 475  * or objects owned by them, such as scanned BSSIDs and configured networks.
 476  */
 477 static DBusHandlerResult wpas_iface_message_handler(DBusConnection *connection,
 478                                                     DBusMessage *message,
 479                                                     void *user_data)
 480 {
 481         struct wpa_supplicant *wpa_s = user_data;
 482         const char *method = dbus_message_get_member(message);
 483         const char *path = dbus_message_get_path(message);
 484         const char *msg_interface = dbus_message_get_interface(message);
 485         char *iface_obj_path = NULL;
 486         char *network = NULL;
 487         char *bssid = NULL;
 488         DBusMessage *reply = NULL;
 489
 490         /* Caller must specify a message interface */
 491         if (!msg_interface)
 492                 goto out;
 493
 494         iface_obj_path = wpas_dbus_decompose_object_path(path, &network,
 495                                                          &bssid);
 496         if (iface_obj_path == NULL) {
 497                 reply = wpas_dbus_new_invalid_iface_error(message);
 498                 goto out;
 499         }
 500
 501         /* Make sure the message's object path actually refers to the
 502          * wpa_supplicant structure it's supposed to (which is wpa_s)
 503          */
 504         if (wpa_supplicant_get_iface_by_dbus_path(wpa_s->global,
 505                                                   iface_obj_path) != wpa_s) {
 506                 reply = wpas_dbus_new_invalid_iface_error(message);
 507                 goto out;
 508         }
 509
 510         if (network && !strcmp(msg_interface, WPAS_DBUS_IFACE_NETWORK)) {
 511                 /* A method for one of this interface's configured networks */
 512                 int nid = strtoul(network, NULL, 10);
 513                 if (errno != EINVAL)
 514                         reply = wpas_dispatch_network_method(message, wpa_s,
 515                                                              nid);
 516                 else
 517                         reply = wpas_dbus_new_invalid_network_error(message);
 518         } else if (bssid && !strcmp(msg_interface, WPAS_DBUS_IFACE_BSSID)) {
 519                 /* A method for one of this interface's scanned BSSIDs */
 520                 reply = wpas_dispatch_bssid_method(message, wpa_s, bssid);
 521         } else if (!strcmp(msg_interface, WPAS_DBUS_IFACE_INTERFACE)) {
 522                 /* A method for an interface only. */
 523                 if (!strcmp(method, "scan"))
 524                         reply = wpas_dbus_iface_scan(message, wpa_s);
 525                 else if (!strcmp(method, "scanResults"))
 526                         reply = wpas_dbus_iface_scan_results(message, wpa_s);
 527                 else if (!strcmp(method, "addNetwork"))
 528                         reply = wpas_dbus_iface_add_network(message, wpa_s);
 529                 else if (!strcmp(method, "removeNetwork"))
 530                         reply = wpas_dbus_iface_remove_network(message, wpa_s);
 531                 else if (!strcmp(method, "selectNetwork"))
 532                         reply = wpas_dbus_iface_select_network(message, wpa_s);
 533                 else if (!strcmp(method, "capabilities"))
 534                         reply = wpas_dbus_iface_capabilities(message, wpa_s);
 535                 else if (!strcmp(method, "disconnect"))
 536                         reply = wpas_dbus_iface_disconnect(message, wpa_s);
 537                 else if (!strcmp(method, "setAPScan"))
 538                         reply = wpas_dbus_iface_set_ap_scan(message, wpa_s);
 539                 else if (!strcmp(method, "setSmartcardModules"))
 540                         reply = wpas_dbus_iface_set_smartcard_modules(message,
 541                                                                       wpa_s);
 542                 else if (!strcmp(method, "state"))
 543                         reply = wpas_dbus_iface_get_state(message, wpa_s);
 544                 else if (!strcmp(method, "setBlobs"))
 545                         reply = wpas_dbus_iface_set_blobs(message, wpa_s);
 546                 else if (!strcmp(method, "removeBlobs"))
 547                         reply = wpas_dbus_iface_remove_blobs(message, wpa_s);
 548         }
 549
 550         /* If the message was handled, send back the reply */
 551         if (reply) {
 552                 if (!dbus_message_get_no_reply(message))
 553                         dbus_connection_send(connection, reply, NULL);
 554                 dbus_message_unref(reply);
 555         }
 556
 557 out:
 558         free(iface_obj_path);
 559         free(network);
 560         free(bssid);
 561         return reply ? DBUS_HANDLER_RESULT_HANDLED :
 562                 DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 563 }
 564
 565
 566 /**
 567  * wpas_message_handler - dispatch incoming dbus messages
 568  * @connection: connection to the system message bus
 569  * @message: an incoming dbus message
 570  * @user_data: a pointer to a dbus control interface data structure
 571  * Returns: whether or not the message was handled
 572  *
 573  * This function dispatches all incoming dbus messages to the correct
 574  * handlers, depending on what the message's target object path is,
 575  * and what the method call is.
 576  */
 577 static DBusHandlerResult wpas_message_handler(DBusConnection *connection,
 578         DBusMessage *message, void *user_data)
 579 {
 580         struct ctrl_iface_dbus_priv *ctrl_iface = user_data;
 581         const char *method;
 582         const char *path;
 583         const char *msg_interface;
 584         DBusMessage *reply = NULL;
 585
 586         method = dbus_message_get_member(message);
 587         path = dbus_message_get_path(message);
 588         msg_interface = dbus_message_get_interface(message);
 589         if (!method || !path || !ctrl_iface || !msg_interface)
 590                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 591
 592         /* Validate the method interface */
 593         if (strcmp(msg_interface, WPAS_DBUS_INTERFACE) != 0)
 594                 return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 595
 596         if (!strcmp(path, WPAS_DBUS_PATH)) {
 597                 /* dispatch methods against our global dbus interface here */
 598                 if (!strcmp(method, "addInterface")) {
 599                         reply = wpas_dbus_global_add_interface(
 600                                 message, ctrl_iface->global);
 601                 } else if (!strcmp(method, "removeInterface")) {
 602                         reply = wpas_dbus_global_remove_interface(
 603                                 message, ctrl_iface->global);
 604                 } else if (!strcmp(method, "getInterface")) {
 605                         reply = wpas_dbus_global_get_interface(
 606                                 message, ctrl_iface->global);
 607                 } else if (!strcmp(method, "setDebugParams")) {
 608                         reply = wpas_dbus_global_set_debugparams(
 609                                 message, ctrl_iface->global);
 610                 }
 611         }
 612
 613         /* If the message was handled, send back the reply */
 614         if (reply) {
 615                 if (!dbus_message_get_no_reply(message))
 616                         dbus_connection_send(connection, reply, NULL);
 617                 dbus_message_unref(reply);
 618         }
 619
 620         return reply ? DBUS_HANDLER_RESULT_HANDLED :
 621                 DBUS_HANDLER_RESULT_NOT_YET_HANDLED;
 622 }
 623
 624
 625 /**
 626  * wpa_supplicant_dbus_notify_scan_results - Send a scan results signal
 627  * @wpa_s: %wpa_supplicant network interface data
 628  * Returns: 0 on success, -1 on failure
 629  *
 630  * Notify listeners that this interface has updated scan results.
 631  */
 632 void wpa_supplicant_dbus_notify_scan_results(struct wpa_supplicant *wpa_s)
 633 {
 634         struct ctrl_iface_dbus_priv *iface = wpa_s->global->dbus_ctrl_iface;
 635         DBusMessage *_signal;
 636         const char *path;
 637
 638         /* Do nothing if the control interface is not turned on */
 639         if (iface == NULL)
 640                 return;
 641
 642         path = wpa_supplicant_get_dbus_path(wpa_s);
 643         if (path == NULL) {
 644                 perror("wpa_supplicant_dbus_notify_scan_results[dbus]: "
 645                        "interface didn't have a dbus path");
 646                 wpa_printf(MSG_ERROR,
 647                            "wpa_supplicant_dbus_notify_scan_results[dbus]: "
 648                            "interface didn't have a dbus path; can't send "
 649                            "scan result signal.");
 650                 return;
 651         }
 652         _signal = dbus_message_new_signal(path, WPAS_DBUS_IFACE_INTERFACE,
 653                                           "ScanResultsAvailable");
 654         if (_signal == NULL) {
 655                 perror("wpa_supplicant_dbus_notify_scan_results[dbus]: "
 656                        "couldn't create dbus signal; likely out of memory");
 657                 wpa_printf(MSG_ERROR, "dbus control interface: not enough "
 658                            "memory to send scan results signal.");
 659                 return;
 660         }
 661         dbus_connection_send(iface->con, _signal, NULL);
 662         dbus_message_unref(_signal);
 663 }
 664
 665
 666 /**
 667  * wpa_supplicant_dbus_notify_state_change - Send a state change signal
 668  * @wpa_s: %wpa_supplicant network interface data
 669  * @new_state: new state wpa_supplicant is entering
 670  * @old_state: old state wpa_supplicant is leaving
 671  * Returns: 0 on success, -1 on failure
 672  *
 673  * Notify listeners that wpa_supplicant has changed state
 674  */
 675 void wpa_supplicant_dbus_notify_state_change(struct wpa_supplicant *wpa_s,
 676                                              wpa_states new_state,
 677                                              wpa_states old_state)
 678 {
 679         struct ctrl_iface_dbus_priv *iface;
 680         DBusMessage *_signal = NULL;
 681         const char *path;
 682         const char *new_state_str, *old_state_str;
 683
 684         /* Do nothing if the control interface is not turned on */
 685         if (wpa_s->global == NULL)
 686                 return;
 687         iface = wpa_s->global->dbus_ctrl_iface;
 688         if (iface == NULL)
 689                 return;
 690
 691         /* Only send signal if state really changed */
 692         if (new_state == old_state)
 693                 return;
 694
 695         path = wpa_supplicant_get_dbus_path(wpa_s);
 696         if (path == NULL) {
 697                 perror("wpa_supplicant_dbus_notify_state_change[dbus]: "
 698                        "interface didn't have a dbus path");
 699                 wpa_printf(MSG_ERROR,
 700                            "wpa_supplicant_dbus_notify_state_change[dbus]: "
 701                            "interface didn't have a dbus path; can't send "
 702                            "signal.");
 703                 return;
 704         }
 705         _signal = dbus_message_new_signal(path, WPAS_DBUS_IFACE_INTERFACE,
 706                                           "StateChange");
 707         if (_signal == NULL) {
 708                 perror("wpa_supplicant_dbus_notify_state_change[dbus]: "
 709                        "couldn't create dbus signal; likely out of memory");
 710                 wpa_printf(MSG_ERROR,
 711                            "wpa_supplicant_dbus_notify_state_change[dbus]: "
 712                            "couldn't create dbus signal; likely out of "
 713                            "memory.");
 714                 return;
 715         }
 716
 717         new_state_str = wpa_supplicant_state_txt(new_state);
 718         old_state_str = wpa_supplicant_state_txt(old_state);
 719         if (new_state_str == NULL || old_state_str == NULL) {
 720                 perror("wpa_supplicant_dbus_notify_state_change[dbus]: "
 721                        "couldn't convert state strings");
 722                 wpa_printf(MSG_ERROR,
 723                            "wpa_supplicant_dbus_notify_state_change[dbus]: "
 724                            "couldn't convert state strings.");
 725                 goto out;
 726         }
 727
 728         if (!dbus_message_append_args(_signal,
 729                                       DBUS_TYPE_STRING, &new_state_str,
 730                                       DBUS_TYPE_STRING, &old_state_str,
 731                                       DBUS_TYPE_INVALID)) {
 732                 perror("wpa_supplicant_dbus_notify_state_change[dbus]: "
 733                        "not enough memory to construct state change signal.");
 734                 wpa_printf(MSG_ERROR,
 735                            "wpa_supplicant_dbus_notify_state_change[dbus]: "
 736                            "not enough memory to construct state change "
 737                            "signal.");
 738                 goto out;
 739         }
 740
 741         dbus_connection_send(iface->con, _signal, NULL);
 742
 743 out:
 744         dbus_message_unref(_signal);
 745 }
 746
 747
 748 #ifdef CONFIG_WPS
 749 void wpa_supplicant_dbus_notify_wps_cred(struct wpa_supplicant *wpa_s,
 750                                          const struct wps_credential *cred)
 751 {
 752         struct ctrl_iface_dbus_priv *iface;
 753         DBusMessage *_signal = NULL;
 754         const char *path;
 755
 756         /* Do nothing if the control interface is not turned on */
 757         if (wpa_s->global == NULL)
 758                 return;
 759         iface = wpa_s->global->dbus_ctrl_iface;
 760         if (iface == NULL)
 761                 return;
 762
 763         path = wpa_supplicant_get_dbus_path(wpa_s);
 764         if (path == NULL) {
 765                 perror("wpa_supplicant_dbus_notify_wps_cred[dbus]: "
 766                        "interface didn't have a dbus path");
 767                 wpa_printf(MSG_ERROR,
 768                            "wpa_supplicant_dbus_notify_wps_cred[dbus]: "
 769                            "interface didn't have a dbus path; can't send "
 770                            "signal.");
 771                 return;
 772         }
 773         _signal = dbus_message_new_signal(path, WPAS_DBUS_IFACE_INTERFACE,
 774                                           "WpsCred");
 775         if (_signal == NULL) {
 776                 perror("wpa_supplicant_dbus_notify_wps_cred[dbus]: "
 777                        "couldn't create dbus signal; likely out of memory");
 778                 wpa_printf(MSG_ERROR,
 779                            "wpa_supplicant_dbus_notify_wps_cred[dbus]: "
 780                            "couldn't create dbus signal; likely out of "
 781                            "memory.");
 782                 return;
 783         }
 784
 785         if (!dbus_message_append_args(_signal,
 786                                       DBUS_TYPE_ARRAY, DBUS_TYPE_BYTE,
 787                                       &cred->cred_attr, cred->cred_attr_len,
 788                                       DBUS_TYPE_INVALID)) {
 789                 perror("wpa_supplicant_dbus_notify_wps_cred[dbus]: "
 790                        "not enough memory to construct signal.");
 791                 wpa_printf(MSG_ERROR,
 792                            "wpa_supplicant_dbus_notify_wps_cred[dbus]: "
 793                            "not enough memory to construct signal.");
 794                 goto out;
 795         }
 796
 797         dbus_connection_send(iface->con, _signal, NULL);
 798
 799 out:
 800         dbus_message_unref(_signal);
 801 }
 802 #endif /* CONFIG_WPS */
 803
 804
 805 /**
 806  * integrate_with_eloop - Register our mainloop integration with dbus
 807  * @connection: connection to the system message bus
 808  * @iface: a dbus control interface data structure
 809  * Returns: 0 on success, -1 on failure
 810  *
 811  * We register our mainloop integration functions with dbus here.
 812  */
 813 static int integrate_with_eloop(DBusConnection *connection,
 814         struct ctrl_iface_dbus_priv *iface)
 815 {
 816         if (!dbus_connection_set_watch_functions(connection, add_watch,
 817                                                  remove_watch, watch_toggled,
 818                                                  iface, NULL)) {
 819                 perror("dbus_connection_set_watch_functions[dbus]");
 820                 wpa_printf(MSG_ERROR, "Not enough memory to set up dbus.");
 821                 return -1;
 822         }
 823
 824         if (!dbus_connection_set_timeout_functions(connection, add_timeout,
 825                                                    remove_timeout,
 826                                                    timeout_toggled, iface,
 827                                                    NULL)) {
 828                 perror("dbus_connection_set_timeout_functions[dbus]");
 829                 wpa_printf(MSG_ERROR, "Not enough memory to set up dbus.");
 830                 return -1;
 831         }
 832
 833         if (connection_setup_wakeup_main(iface) < 0) {
 834                 perror("connection_setup_wakeup_main[dbus]");
 835                 wpa_printf(MSG_ERROR, "Could not setup main wakeup function.");
 836                 return -1;
 837         }
 838
 839         return 0;
 840 }
 841
 842
 843 /**
 844  * dispatch_initial_dbus_messages - Dispatch initial dbus messages after
 845  *     claiming bus name
 846  * @eloop_ctx: the DBusConnection to dispatch on
 847  * @timeout_ctx: unused
 848  *
 849  * If clients are quick to notice that wpa_supplicant claimed its bus name,
 850  * there may have been messages that came in before initialization was
 851  * all finished.  Dispatch those here.
 852  */
 853 static void dispatch_initial_dbus_messages(void *eloop_ctx, void *timeout_ctx)
 854 {
 855         DBusConnection *con = eloop_ctx;
 856
 857         while (dbus_connection_get_dispatch_status(con) ==
 858                DBUS_DISPATCH_DATA_REMAINS)
 859                 dbus_connection_dispatch(con);
 860 }
 861
 862
 863 /**
 864  * wpa_supplicant_dbus_ctrl_iface_init - Initialize dbus control interface
 865  * @global: Pointer to global data from wpa_supplicant_init()
 866  * Returns: Pointer to dbus_ctrl_iface date or %NULL on failure
 867  *
 868  * Initialize the dbus control interface and start receiving commands from
 869  * external programs over the bus.
 870  */
 871 struct ctrl_iface_dbus_priv *
 872 wpa_supplicant_dbus_ctrl_iface_init(struct wpa_global *global)
 873 {
 874         struct ctrl_iface_dbus_priv *iface;
 875         DBusError error;
 876         int ret = -1;
 877         DBusObjectPathVTable wpas_vtable = {
 878                 NULL, &wpas_message_handler, NULL, NULL, NULL, NULL
 879         };
 880
 881         iface = os_zalloc(sizeof(struct ctrl_iface_dbus_priv));
 882         if (iface == NULL)
 883                 return NULL;
 884
 885         iface->global = global;
 886
 887         /* Get a reference to the system bus */
 888         dbus_error_init(&error);
 889         iface->con = dbus_bus_get(DBUS_BUS_SYSTEM, &error);
 890         dbus_error_free(&error);
 891         if (!iface->con) {
 892                 perror("dbus_bus_get[ctrl_iface_dbus]");
 893                 wpa_printf(MSG_ERROR, "Could not acquire the system bus.");
 894                 goto fail;
 895         }
 896
 897         /* Tell dbus about our mainloop integration functions */
 898         if (integrate_with_eloop(iface->con, iface))
 899                 goto fail;
 900
 901         /* Register the message handler for the global dbus interface */
 902         if (!dbus_connection_register_object_path(iface->con,
 903                                                   WPAS_DBUS_PATH, &wpas_vtable,
 904                                                   iface)) {
 905                 perror("dbus_connection_register_object_path[dbus]");
 906                 wpa_printf(MSG_ERROR, "Could not set up DBus message "
 907                            "handler.");
 908                 goto fail;
 909         }
 910
 911         /* Register our service with the message bus */
 912         dbus_error_init(&error);
 913         switch (dbus_bus_request_name(iface->con, WPAS_DBUS_SERVICE,
 914                                       0, &error)) {
 915         case DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER:
 916                 ret = 0;
 917                 break;
 918         case DBUS_REQUEST_NAME_REPLY_EXISTS:
 919         case DBUS_REQUEST_NAME_REPLY_IN_QUEUE:
 920         case DBUS_REQUEST_NAME_REPLY_ALREADY_OWNER:
 921                 perror("dbus_bus_request_name[dbus]");
 922                 wpa_printf(MSG_ERROR, "Could not request DBus service name: "
 923                            "already registered.");
 924                 break;
 925         default:
 926                 perror("dbus_bus_request_name[dbus]");
 927                 wpa_printf(MSG_ERROR, "Could not request DBus service name: "
 928                            "%s %s.", error.name, error.message);
 929                 break;
 930         }
 931         dbus_error_free(&error);
 932
 933         if (ret != 0)
 934                 goto fail;
 935
 936         wpa_printf(MSG_DEBUG, "Providing DBus service '" WPAS_DBUS_SERVICE
 937                    "'.");
 938
 939         /*
 940          * Dispatch initial DBus messages that may have come in since the bus
 941          * name was claimed above. Happens when clients are quick to notice the
 942          * wpa_supplicant service.
 943          *
 944          * FIXME: is there a better solution to this problem?
 945          */
 946         eloop_register_timeout(0, 50, dispatch_initial_dbus_messages,
 947                                iface->con, NULL);
 948
 949         return iface;
 950
 951 fail:
 952         wpa_supplicant_dbus_ctrl_iface_deinit(iface);
 953         return NULL;
 954 }
 955
 956
 957 /**
 958  * wpa_supplicant_dbus_ctrl_iface_deinit - Deinitialize dbus ctrl interface
 959  * @iface: Pointer to dbus private data from
 960  * wpa_supplicant_dbus_ctrl_iface_init()
 961  *
 962  * Deinitialize the dbus control interface that was initialized with
 963  * wpa_supplicant_dbus_ctrl_iface_init().
 964  */
 965 void wpa_supplicant_dbus_ctrl_iface_deinit(struct ctrl_iface_dbus_priv *iface)
 966 {
 967         if (iface == NULL)
 968                 return;
 969
 970         if (iface->con) {
 971                 eloop_cancel_timeout(dispatch_initial_dbus_messages,
 972                                      iface->con, NULL);
 973                 dbus_connection_set_watch_functions(iface->con, NULL, NULL,
 974                                                     NULL, NULL, NULL);
 975                 dbus_connection_set_timeout_functions(iface->con, NULL, NULL,
 976                                                       NULL, NULL, NULL);
 977                 dbus_connection_unref(iface->con);
 978         }
 979
 980         memset(iface, 0, sizeof(struct ctrl_iface_dbus_priv));
 981         free(iface);
 982 }
 983
 984
 985 /**
 986  * wpas_dbus_register_new_iface - Register a new interface with dbus
 987  * @wpa_s: %wpa_supplicant interface description structure to register
 988  * Returns: 0 on success, -1 on error
 989  *
 990  * Registers a new interface with dbus and assigns it a dbus object path.
 991  */
 992 int wpas_dbus_register_iface(struct wpa_supplicant *wpa_s)
 993 {
 994         struct ctrl_iface_dbus_priv *ctrl_iface =
 995                 wpa_s->global->dbus_ctrl_iface;
 996         DBusConnection * con;
 997         u32 next;
 998         DBusObjectPathVTable vtable = {
 999                 NULL, &wpas_iface_message_handler, NULL, NULL, NULL, NULL
1000         };
1001         char *path;
1002         int ret = -1;
1003
1004         /* Do nothing if the control interface is not turned on */
1005         if (ctrl_iface == NULL)
1006                 return 0;
1007
1008         con = ctrl_iface->con;
1009         next = wpa_supplicant_dbus_next_objid(ctrl_iface);
1010
1011         /* Create and set the interface's object path */
1012         path = os_zalloc(WPAS_DBUS_OBJECT_PATH_MAX);
1013         if (path == NULL)
1014                 return -1;
1015         snprintf(path, WPAS_DBUS_OBJECT_PATH_MAX,
1016                  WPAS_DBUS_PATH_INTERFACES "/%u",
1017                  next);
1018         if (wpa_supplicant_set_dbus_path(wpa_s, path)) {
1019                 wpa_printf(MSG_DEBUG,
1020                            "Failed to set dbus path for interface %s",
1021                            wpa_s->ifname);
1022                 goto out;
1023         }
1024
1025         /* Register the message handler for the interface functions */
1026         if (!dbus_connection_register_fallback(con, path, &vtable, wpa_s)) {
1027                 perror("wpas_dbus_register_iface [dbus]");
1028                 wpa_printf(MSG_ERROR, "Could not set up DBus message "
1029                            "handler for interface %s.", wpa_s->ifname);
1030                 goto out;
1031         }
1032         ret = 0;
1033
1034 out:
1035         free(path);
1036         return ret;
1037 }
1038
1039
1040 /**
1041  * wpas_dbus_unregister_iface - Unregister an interface from dbus
1042  * @wpa_s: wpa_supplicant interface structure
1043  * Returns: 0 on success, -1 on failure
1044  *
1045  * Unregisters the interface with dbus
1046  */
1047 int wpas_dbus_unregister_iface(struct wpa_supplicant *wpa_s)
1048 {
1049         struct ctrl_iface_dbus_priv *ctrl_iface;
1050         DBusConnection *con;
1051         const char *path;
1052
1053         /* Do nothing if the control interface is not turned on */
1054         if (wpa_s == NULL || wpa_s->global == NULL)
1055                 return 0;
1056         ctrl_iface = wpa_s->global->dbus_ctrl_iface;
1057         if (ctrl_iface == NULL)
1058                 return 0;
1059
1060         con = ctrl_iface->con;
1061         path = wpa_supplicant_get_dbus_path(wpa_s);
1062
1063         if (!dbus_connection_unregister_object_path(con, path))
1064                 return -1;
1065
1066         free(wpa_s->dbus_path);
1067         wpa_s->dbus_path = NULL;
1068
1069         return 0;
1070 }
1071
1072
1073 /**
1074  * wpa_supplicant_get_iface_by_dbus_path - Get a new network interface
1075  * @global: Pointer to global data from wpa_supplicant_init()
1076  * @path: Pointer to a dbus object path representing an interface
1077  * Returns: Pointer to the interface or %NULL if not found
1078  */
1079 struct wpa_supplicant * wpa_supplicant_get_iface_by_dbus_path(
1080         struct wpa_global *global, const char *path)
1081 {
1082         struct wpa_supplicant *wpa_s;
1083
1084         for (wpa_s = global->ifaces; wpa_s; wpa_s = wpa_s->next) {
1085                 if (strcmp(wpa_s->dbus_path, path) == 0)
1086                         return wpa_s;
1087         }
1088         return NULL;
1089 }
1090
1091
1092 /**
1093  * wpa_supplicant_set_dbus_path - Assign a dbus path to an interface
1094  * @wpa_s: wpa_supplicant interface structure
1095  * @path: dbus path to set on the interface
1096  * Returns: 0 on succes, -1 on error
1097  */
1098 int wpa_supplicant_set_dbus_path(struct wpa_supplicant *wpa_s,
1099                                   const char *path)
1100 {
1101         u32 len = strlen (path);
1102         if (len >= WPAS_DBUS_OBJECT_PATH_MAX)
1103                 return -1;
1104         if (wpa_s->dbus_path)
1105                 return -1;
1106         wpa_s->dbus_path = strdup(path);
1107         return 0;
1108 }
1109
1110
1111 /**
1112  * wpa_supplicant_get_dbus_path - Get an interface's dbus path
1113  * @wpa_s: %wpa_supplicant interface structure
1114  * Returns: Interface's dbus object path, or %NULL on error
1115  */
1116 const char * wpa_supplicant_get_dbus_path(struct wpa_supplicant *wpa_s)
1117 {
1118         return wpa_s->dbus_path;
1119 }