WifiScanningServiceImpl.java revision 11bb0926a6cc3380f2217532fefb9605a1fdc9e8
1/* 2 * Copyright (C) 2008 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package com.android.server.wifi.scanner; 18 19import android.Manifest; 20import android.app.AlarmManager; 21import android.app.PendingIntent; 22import android.content.BroadcastReceiver; 23import android.content.Context; 24import android.content.Intent; 25import android.content.IntentFilter; 26import android.content.pm.PackageManager; 27import android.net.wifi.IWifiScanner; 28import android.net.wifi.ScanResult; 29import android.net.wifi.WifiManager; 30import android.net.wifi.WifiScanner; 31import android.net.wifi.WifiScanner.BssidInfo; 32import android.net.wifi.WifiScanner.ChannelSpec; 33import android.net.wifi.WifiScanner.PnoSettings; 34import android.net.wifi.WifiScanner.ScanData; 35import android.net.wifi.WifiScanner.ScanSettings; 36import android.os.Binder; 37import android.os.Bundle; 38import android.os.Handler; 39import android.os.Looper; 40import android.os.Message; 41import android.os.Messenger; 42import android.os.RemoteException; 43import android.os.WorkSource; 44import android.util.ArrayMap; 45import android.util.LocalLog; 46import android.util.Log; 47import android.util.Pair; 48 49import com.android.internal.app.IBatteryStats; 50import com.android.internal.util.AsyncChannel; 51import com.android.internal.util.Protocol; 52import com.android.internal.util.State; 53import com.android.internal.util.StateMachine; 54import com.android.server.wifi.Clock; 55import com.android.server.wifi.WifiInjector; 56import com.android.server.wifi.WifiMetrics; 57import com.android.server.wifi.WifiMetricsProto; 58import com.android.server.wifi.WifiNative; 59import com.android.server.wifi.WifiStateMachine; 60import com.android.server.wifi.scanner.ChannelHelper.ChannelCollection; 61 62import java.io.FileDescriptor; 63import java.io.PrintWriter; 64import java.util.ArrayList; 65import java.util.Collection; 66import java.util.HashMap; 67import java.util.HashSet; 68import java.util.Iterator; 69import java.util.Set; 70 71public class WifiScanningServiceImpl extends IWifiScanner.Stub { 72 73 private static final String TAG = WifiScanningService.TAG; 74 private static final boolean DBG = false; 75 76 private static final int MIN_PERIOD_PER_CHANNEL_MS = 200; // DFS needs 120 ms 77 private static final int UNKNOWN_PID = -1; 78 79 private final LocalLog mLocalLog = new LocalLog(1024); 80 81 private void localLog(String message) { 82 mLocalLog.log(message); 83 } 84 85 private void logw(String message) { 86 Log.w(TAG, message); 87 mLocalLog.log(message); 88 } 89 90 private void loge(String message) { 91 Log.e(TAG, message); 92 mLocalLog.log(message); 93 } 94 95 private WifiScannerImpl mScannerImpl; 96 97 @Override 98 public Messenger getMessenger() { 99 if (mClientHandler != null) { 100 return new Messenger(mClientHandler); 101 } else { 102 loge("WifiScanningServiceImpl trying to get messenger w/o initialization"); 103 return null; 104 } 105 } 106 107 @Override 108 public Bundle getAvailableChannels(int band) { 109 mChannelHelper.updateChannels(); 110 ChannelSpec[] channelSpecs = mChannelHelper.getAvailableScanChannels(band); 111 ArrayList<Integer> list = new ArrayList<Integer>(channelSpecs.length); 112 for (ChannelSpec channelSpec : channelSpecs) { 113 list.add(channelSpec.frequency); 114 } 115 Bundle b = new Bundle(); 116 b.putIntegerArrayList(WifiScanner.GET_AVAILABLE_CHANNELS_EXTRA, list); 117 return b; 118 } 119 120 private void enforceLocationHardwarePermission(int uid) { 121 mContext.enforcePermission( 122 Manifest.permission.LOCATION_HARDWARE, 123 UNKNOWN_PID, uid, 124 "LocationHardware"); 125 } 126 127 private class ClientHandler extends Handler { 128 129 ClientHandler(Looper looper) { 130 super(looper); 131 } 132 133 @Override 134 public void handleMessage(Message msg) { 135 switch (msg.what) { 136 case AsyncChannel.CMD_CHANNEL_FULL_CONNECTION: { 137 ExternalClientInfo client = (ExternalClientInfo) mClients.get(msg.replyTo); 138 if (client != null) { 139 logw("duplicate client connection: " + msg.sendingUid); 140 client.mChannel.replyToMessage(msg, AsyncChannel.CMD_CHANNEL_FULLY_CONNECTED, 141 AsyncChannel.STATUS_FULL_CONNECTION_REFUSED_ALREADY_CONNECTED); 142 return; 143 } 144 145 AsyncChannel ac = new AsyncChannel(); 146 ac.connected(mContext, this, msg.replyTo); 147 148 client = new ExternalClientInfo(msg.sendingUid, msg.replyTo, ac); 149 client.register(); 150 151 ac.replyToMessage(msg, AsyncChannel.CMD_CHANNEL_FULLY_CONNECTED, 152 AsyncChannel.STATUS_SUCCESSFUL); 153 154 if (DBG) Log.d(TAG, "client connected: " + client); 155 return; 156 } 157 case AsyncChannel.CMD_CHANNEL_DISCONNECT: { 158 ExternalClientInfo client = (ExternalClientInfo) mClients.get(msg.replyTo); 159 if (client != null) { 160 client.mChannel.disconnect(); 161 } 162 return; 163 } 164 case AsyncChannel.CMD_CHANNEL_DISCONNECTED: { 165 ExternalClientInfo client = (ExternalClientInfo) mClients.get(msg.replyTo); 166 if (client != null) { 167 if (DBG) { 168 Log.d(TAG, "client disconnected: " + client + ", reason: " + msg.arg1); 169 } 170 client.cleanup(); 171 } 172 return; 173 } 174 } 175 176 try { 177 enforceLocationHardwarePermission(msg.sendingUid); 178 } catch (SecurityException e) { 179 localLog("failed to authorize app: " + e); 180 replyFailed(msg, WifiScanner.REASON_NOT_AUTHORIZED, "Not authorized"); 181 return; 182 } 183 184 // Since this message is sent from WifiScanner using |sendMessageSynchronously| which 185 // doesn't set the correct |msg.replyTo| field. 186 if (msg.what == WifiScanner.CMD_GET_SCAN_RESULTS) { 187 mBackgroundScanStateMachine.sendMessage(Message.obtain(msg)); 188 return; 189 } 190 191 ClientInfo ci = mClients.get(msg.replyTo); 192 if (ci == null) { 193 loge("Could not find client info for message " + msg.replyTo); 194 replyFailed(msg, WifiScanner.REASON_INVALID_LISTENER, "Could not find listener"); 195 return; 196 } 197 198 switch (msg.what) { 199 case WifiScanner.CMD_START_BACKGROUND_SCAN: 200 case WifiScanner.CMD_STOP_BACKGROUND_SCAN: 201 case WifiScanner.CMD_SET_HOTLIST: 202 case WifiScanner.CMD_RESET_HOTLIST: 203 mBackgroundScanStateMachine.sendMessage(Message.obtain(msg)); 204 break; 205 case WifiScanner.CMD_START_PNO_SCAN: 206 case WifiScanner.CMD_STOP_PNO_SCAN: 207 mPnoScanStateMachine.sendMessage(Message.obtain(msg)); 208 break; 209 case WifiScanner.CMD_START_SINGLE_SCAN: 210 case WifiScanner.CMD_STOP_SINGLE_SCAN: 211 mSingleScanStateMachine.sendMessage(Message.obtain(msg)); 212 break; 213 case WifiScanner.CMD_CONFIGURE_WIFI_CHANGE: 214 case WifiScanner.CMD_START_TRACKING_CHANGE: 215 case WifiScanner.CMD_STOP_TRACKING_CHANGE: 216 mWifiChangeStateMachine.sendMessage(Message.obtain(msg)); 217 break; 218 default: 219 replyFailed(msg, WifiScanner.REASON_INVALID_REQUEST, "Invalid request"); 220 break; 221 } 222 } 223 } 224 225 private static final int BASE = Protocol.BASE_WIFI_SCANNER_SERVICE; 226 227 private static final int CMD_SCAN_RESULTS_AVAILABLE = BASE + 0; 228 private static final int CMD_FULL_SCAN_RESULTS = BASE + 1; 229 private static final int CMD_HOTLIST_AP_FOUND = BASE + 2; 230 private static final int CMD_HOTLIST_AP_LOST = BASE + 3; 231 private static final int CMD_WIFI_CHANGE_DETECTED = BASE + 4; 232 private static final int CMD_WIFI_CHANGE_TIMEOUT = BASE + 5; 233 private static final int CMD_DRIVER_LOADED = BASE + 6; 234 private static final int CMD_DRIVER_UNLOADED = BASE + 7; 235 private static final int CMD_SCAN_PAUSED = BASE + 8; 236 private static final int CMD_SCAN_RESTARTED = BASE + 9; 237 private static final int CMD_SCAN_FAILED = BASE + 10; 238 private static final int CMD_PNO_NETWORK_FOUND = BASE + 11; 239 private static final int CMD_PNO_SCAN_FAILED = BASE + 12; 240 241 private final Context mContext; 242 private final Looper mLooper; 243 private final WifiScannerImpl.WifiScannerImplFactory mScannerImplFactory; 244 private final ArrayMap<Messenger, ClientInfo> mClients; 245 246 private ChannelHelper mChannelHelper; 247 private BackgroundScanScheduler mBackgroundScheduler; 248 private WifiNative.ScanSettings mPreviousSchedule; 249 250 private WifiBackgroundScanStateMachine mBackgroundScanStateMachine; 251 private WifiSingleScanStateMachine mSingleScanStateMachine; 252 private WifiChangeStateMachine mWifiChangeStateMachine; 253 private WifiPnoScanStateMachine mPnoScanStateMachine; 254 private ClientHandler mClientHandler; 255 private final IBatteryStats mBatteryStats; 256 private final AlarmManager mAlarmManager; 257 private final WifiMetrics mWifiMetrics; 258 private final Clock mClock; 259 260 WifiScanningServiceImpl(Context context, Looper looper, 261 WifiScannerImpl.WifiScannerImplFactory scannerImplFactory, IBatteryStats batteryStats, 262 WifiInjector wifiInjector) { 263 mContext = context; 264 mLooper = looper; 265 mScannerImplFactory = scannerImplFactory; 266 mBatteryStats = batteryStats; 267 mClients = new ArrayMap<>(); 268 mAlarmManager = (AlarmManager) mContext.getSystemService(Context.ALARM_SERVICE); 269 mWifiMetrics = wifiInjector.getWifiMetrics(); 270 mClock = wifiInjector.getClock(); 271 272 mPreviousSchedule = null; 273 } 274 275 public void startService() { 276 mClientHandler = new ClientHandler(mLooper); 277 mBackgroundScanStateMachine = new WifiBackgroundScanStateMachine(mLooper); 278 mWifiChangeStateMachine = new WifiChangeStateMachine(mLooper); 279 mSingleScanStateMachine = new WifiSingleScanStateMachine(mLooper); 280 mPnoScanStateMachine = new WifiPnoScanStateMachine(mLooper); 281 282 mContext.registerReceiver( 283 new BroadcastReceiver() { 284 @Override 285 public void onReceive(Context context, Intent intent) { 286 int state = intent.getIntExtra( 287 WifiManager.EXTRA_SCAN_AVAILABLE, WifiManager.WIFI_STATE_DISABLED); 288 if (DBG) localLog("SCAN_AVAILABLE : " + state); 289 if (state == WifiManager.WIFI_STATE_ENABLED) { 290 mBackgroundScanStateMachine.sendMessage(CMD_DRIVER_LOADED); 291 mSingleScanStateMachine.sendMessage(CMD_DRIVER_LOADED); 292 mPnoScanStateMachine.sendMessage(CMD_DRIVER_LOADED); 293 } else if (state == WifiManager.WIFI_STATE_DISABLED) { 294 mBackgroundScanStateMachine.sendMessage(CMD_DRIVER_UNLOADED); 295 mSingleScanStateMachine.sendMessage(CMD_DRIVER_UNLOADED); 296 mPnoScanStateMachine.sendMessage(CMD_DRIVER_UNLOADED); 297 } 298 } 299 }, new IntentFilter(WifiManager.WIFI_SCAN_AVAILABLE)); 300 301 mBackgroundScanStateMachine.start(); 302 mWifiChangeStateMachine.start(); 303 mSingleScanStateMachine.start(); 304 mPnoScanStateMachine.start(); 305 } 306 307 private static boolean isWorkSourceValid(WorkSource workSource) { 308 return workSource != null && workSource.size() > 0 && workSource.get(0) >= 0; 309 } 310 311 private WorkSource computeWorkSource(ClientInfo ci, WorkSource requestedWorkSource) { 312 if (requestedWorkSource != null) { 313 if (isWorkSourceValid(requestedWorkSource)) { 314 // Wifi currently doesn't use names, so need to clear names out of the 315 // supplied WorkSource to allow future WorkSource combining. 316 requestedWorkSource.clearNames(); 317 return requestedWorkSource; 318 } else { 319 loge("Got invalid work source request: " + requestedWorkSource.toString() + 320 " from " + ci); 321 } 322 } 323 WorkSource callingWorkSource = new WorkSource(ci.getUid()); 324 if (isWorkSourceValid(callingWorkSource)) { 325 return callingWorkSource; 326 } else { 327 loge("Client has invalid work source: " + callingWorkSource); 328 return new WorkSource(); 329 } 330 } 331 332 private class RequestInfo<T> { 333 final ClientInfo clientInfo; 334 final int handlerId; 335 final WorkSource workSource; 336 final T settings; 337 338 RequestInfo(ClientInfo clientInfo, int handlerId, WorkSource requestedWorkSource, 339 T settings) { 340 this.clientInfo = clientInfo; 341 this.handlerId = handlerId; 342 this.settings = settings; 343 this.workSource = computeWorkSource(clientInfo, requestedWorkSource); 344 } 345 346 void reportEvent(int what, int arg1, Object obj) { 347 clientInfo.reportEvent(what, arg1, handlerId, obj); 348 } 349 } 350 351 private class RequestList<T> extends ArrayList<RequestInfo<T>> { 352 void addRequest(ClientInfo ci, int handler, WorkSource reqworkSource, T settings) { 353 add(new RequestInfo<T>(ci, handler, reqworkSource, settings)); 354 } 355 356 T removeRequest(ClientInfo ci, int handlerId) { 357 T removed = null; 358 Iterator<RequestInfo<T>> iter = iterator(); 359 while (iter.hasNext()) { 360 RequestInfo<T> entry = iter.next(); 361 if (entry.clientInfo == ci && entry.handlerId == handlerId) { 362 removed = entry.settings; 363 iter.remove(); 364 } 365 } 366 return removed; 367 } 368 369 Collection<T> getAllSettings() { 370 ArrayList<T> settingsList = new ArrayList<>(); 371 Iterator<RequestInfo<T>> iter = iterator(); 372 while (iter.hasNext()) { 373 RequestInfo<T> entry = iter.next(); 374 settingsList.add(entry.settings); 375 } 376 return settingsList; 377 } 378 379 Collection<T> getAllSettingsForClient(ClientInfo ci) { 380 ArrayList<T> settingsList = new ArrayList<>(); 381 Iterator<RequestInfo<T>> iter = iterator(); 382 while (iter.hasNext()) { 383 RequestInfo<T> entry = iter.next(); 384 if (entry.clientInfo == ci) { 385 settingsList.add(entry.settings); 386 } 387 } 388 return settingsList; 389 } 390 391 void removeAllForClient(ClientInfo ci) { 392 Iterator<RequestInfo<T>> iter = iterator(); 393 while (iter.hasNext()) { 394 RequestInfo<T> entry = iter.next(); 395 if (entry.clientInfo == ci) { 396 iter.remove(); 397 } 398 } 399 } 400 401 WorkSource createMergedWorkSource() { 402 WorkSource mergedSource = new WorkSource(); 403 for (RequestInfo<T> entry : this) { 404 mergedSource.add(entry.workSource); 405 } 406 return mergedSource; 407 } 408 } 409 410 /** 411 * State machine that holds the state of single scans. Scans should only be active in the 412 * ScanningState. The pending scans and active scans maps are swaped when entering 413 * ScanningState. Any requests queued while scanning will be placed in the pending queue and 414 * executed after transitioning back to IdleState. 415 */ 416 class WifiSingleScanStateMachine extends StateMachine implements WifiNative.ScanEventHandler { 417 private final DefaultState mDefaultState = new DefaultState(); 418 private final DriverStartedState mDriverStartedState = new DriverStartedState(); 419 private final IdleState mIdleState = new IdleState(); 420 private final ScanningState mScanningState = new ScanningState(); 421 422 private RequestList<ScanSettings> mActiveScans = new RequestList<>(); 423 private RequestList<ScanSettings> mPendingScans = new RequestList<>(); 424 425 WifiSingleScanStateMachine(Looper looper) { 426 super("WifiSingleScanStateMachine", looper); 427 428 setLogRecSize(128); 429 setLogOnlyTransitions(false); 430 431 // CHECKSTYLE:OFF IndentationCheck 432 addState(mDefaultState); 433 addState(mDriverStartedState, mDefaultState); 434 addState(mIdleState, mDriverStartedState); 435 addState(mScanningState, mDriverStartedState); 436 // CHECKSTYLE:ON IndentationCheck 437 438 setInitialState(mDefaultState); 439 } 440 441 /** 442 * Called to indicate a change in state for the current scan. 443 * Will dispatch a coresponding event to the state machine 444 */ 445 @Override 446 public void onScanStatus(int event) { 447 if (DBG) localLog("onScanStatus event received, event=" + event); 448 switch(event) { 449 case WifiNative.WIFI_SCAN_RESULTS_AVAILABLE: 450 case WifiNative.WIFI_SCAN_THRESHOLD_NUM_SCANS: 451 case WifiNative.WIFI_SCAN_THRESHOLD_PERCENT: 452 sendMessage(CMD_SCAN_RESULTS_AVAILABLE); 453 break; 454 case WifiNative.WIFI_SCAN_FAILED: 455 sendMessage(CMD_SCAN_FAILED); 456 break; 457 default: 458 Log.e(TAG, "Unknown scan status event: " + event); 459 break; 460 } 461 } 462 463 /** 464 * Called for each full scan result if requested 465 */ 466 @Override 467 public void onFullScanResult(ScanResult fullScanResult, int bucketsScanned) { 468 if (DBG) localLog("onFullScanResult received"); 469 sendMessage(CMD_FULL_SCAN_RESULTS, 0, bucketsScanned, fullScanResult); 470 } 471 472 @Override 473 public void onScanPaused(ScanData[] scanData) { 474 // should not happen for single scan 475 Log.e(TAG, "Got scan paused for single scan"); 476 } 477 478 @Override 479 public void onScanRestarted() { 480 // should not happen for single scan 481 Log.e(TAG, "Got scan restarted for single scan"); 482 } 483 484 class DefaultState extends State { 485 @Override 486 public void enter() { 487 mActiveScans.clear(); 488 mPendingScans.clear(); 489 } 490 @Override 491 public boolean processMessage(Message msg) { 492 switch (msg.what) { 493 case CMD_DRIVER_LOADED: 494 transitionTo(mIdleState); 495 return HANDLED; 496 case CMD_DRIVER_UNLOADED: 497 transitionTo(mDefaultState); 498 return HANDLED; 499 case WifiScanner.CMD_START_SINGLE_SCAN: 500 case WifiScanner.CMD_STOP_SINGLE_SCAN: 501 replyFailed(msg, WifiScanner.REASON_UNSPECIFIED, "not available"); 502 return HANDLED; 503 case CMD_SCAN_RESULTS_AVAILABLE: 504 if (DBG) localLog("ignored scan results available event"); 505 return HANDLED; 506 case CMD_FULL_SCAN_RESULTS: 507 if (DBG) localLog("ignored full scan result event"); 508 return HANDLED; 509 default: 510 return NOT_HANDLED; 511 } 512 513 } 514 } 515 516 /** 517 * State representing when the driver is running. This state is not meant to be transitioned 518 * directly, but is instead indented as a parent state of ScanningState and IdleState 519 * to hold common functionality and handle cleaning up scans when the driver is shut down. 520 */ 521 class DriverStartedState extends State { 522 @Override 523 public void exit() { 524 mWifiMetrics.incrementScanReturnEntry( 525 WifiMetricsProto.WifiLog.SCAN_FAILURE_INTERRUPTED, 526 mPendingScans.size()); 527 sendOpFailedToAllAndClear(mPendingScans, WifiScanner.REASON_UNSPECIFIED, 528 "Scan was interrupted"); 529 } 530 531 @Override 532 public boolean processMessage(Message msg) { 533 ClientInfo ci = mClients.get(msg.replyTo); 534 535 switch (msg.what) { 536 case WifiScanner.CMD_START_SINGLE_SCAN: 537 mWifiMetrics.incrementOneshotScanCount(); 538 int handler = msg.arg2; 539 Bundle scanParams = (Bundle) msg.obj; 540 if (scanParams == null) { 541 logCallback("singleScanInvalidRequest", ci, handler, "null params"); 542 replyFailed(msg, WifiScanner.REASON_INVALID_REQUEST, "params null"); 543 return HANDLED; 544 } 545 scanParams.setDefusable(true); 546 ScanSettings scanSettings = 547 scanParams.getParcelable(WifiScanner.SCAN_PARAMS_SCAN_SETTINGS_KEY); 548 WorkSource workSource = 549 scanParams.getParcelable(WifiScanner.SCAN_PARAMS_WORK_SOURCE_KEY); 550 if (validateAndAddToScanQueue(ci, handler, scanSettings, workSource)) { 551 replySucceeded(msg); 552 // If were not currently scanning then try to start a scan. Otherwise 553 // this scan will be scheduled when transitioning back to IdleState 554 // after finishing the current scan. 555 if (getCurrentState() != mScanningState) { 556 tryToStartNewScan(); 557 } 558 } else { 559 logCallback("singleScanInvalidRequest", ci, handler, "bad request"); 560 replyFailed(msg, WifiScanner.REASON_INVALID_REQUEST, "bad request"); 561 mWifiMetrics.incrementScanReturnEntry( 562 WifiMetricsProto.WifiLog.SCAN_FAILURE_INVALID_CONFIGURATION, 1); 563 } 564 return HANDLED; 565 case WifiScanner.CMD_STOP_SINGLE_SCAN: 566 removeSingleScanRequest(ci, msg.arg2); 567 return HANDLED; 568 default: 569 return NOT_HANDLED; 570 } 571 } 572 } 573 574 class IdleState extends State { 575 @Override 576 public void enter() { 577 tryToStartNewScan(); 578 } 579 580 @Override 581 public boolean processMessage(Message msg) { 582 return NOT_HANDLED; 583 } 584 } 585 586 class ScanningState extends State { 587 private WorkSource mScanWorkSource; 588 589 @Override 590 public void enter() { 591 mScanWorkSource = mActiveScans.createMergedWorkSource(); 592 try { 593 mBatteryStats.noteWifiScanStartedFromSource(mScanWorkSource); 594 } catch (RemoteException e) { 595 loge(e.toString()); 596 } 597 } 598 599 @Override 600 public void exit() { 601 try { 602 mBatteryStats.noteWifiScanStoppedFromSource(mScanWorkSource); 603 } catch (RemoteException e) { 604 loge(e.toString()); 605 } 606 607 // if any scans are still active (never got results available then indicate failure) 608 mWifiMetrics.incrementScanReturnEntry( 609 WifiMetricsProto.WifiLog.SCAN_UNKNOWN, 610 mActiveScans.size()); 611 sendOpFailedToAllAndClear(mActiveScans, WifiScanner.REASON_UNSPECIFIED, 612 "Scan was interrupted"); 613 } 614 615 @Override 616 public boolean processMessage(Message msg) { 617 switch (msg.what) { 618 case CMD_SCAN_RESULTS_AVAILABLE: 619 mWifiMetrics.incrementScanReturnEntry( 620 WifiMetricsProto.WifiLog.SCAN_SUCCESS, 621 mActiveScans.size()); 622 reportScanResults(mScannerImpl.getLatestSingleScanResults()); 623 mActiveScans.clear(); 624 transitionTo(mIdleState); 625 return HANDLED; 626 case CMD_FULL_SCAN_RESULTS: 627 reportFullScanResult((ScanResult) msg.obj, /* bucketsScanned */ msg.arg2); 628 return HANDLED; 629 case CMD_SCAN_FAILED: 630 mWifiMetrics.incrementScanReturnEntry( 631 WifiMetricsProto.WifiLog.SCAN_UNKNOWN, mActiveScans.size()); 632 sendOpFailedToAllAndClear(mActiveScans, WifiScanner.REASON_UNSPECIFIED, 633 "Scan failed"); 634 transitionTo(mIdleState); 635 return HANDLED; 636 default: 637 return NOT_HANDLED; 638 } 639 } 640 } 641 642 boolean validateAndAddToScanQueue(ClientInfo ci, int handler, ScanSettings settings, 643 WorkSource workSource) { 644 if (ci == null) { 645 Log.d(TAG, "Failing single scan request ClientInfo not found " + handler); 646 return false; 647 } 648 if (settings.band == WifiScanner.WIFI_BAND_UNSPECIFIED) { 649 if (settings.channels == null || settings.channels.length == 0) { 650 Log.d(TAG, "Failing single scan because channel list was empty"); 651 return false; 652 } 653 } 654 logScanRequest("addSingleScanRequest", ci, handler, workSource, settings, null); 655 mPendingScans.addRequest(ci, handler, workSource, settings); 656 return true; 657 } 658 659 void removeSingleScanRequest(ClientInfo ci, int handler) { 660 if (ci != null) { 661 logScanRequest("removeSingleScanRequest", ci, handler, null, null, null); 662 mPendingScans.removeRequest(ci, handler); 663 mActiveScans.removeRequest(ci, handler); 664 } 665 } 666 667 void removeSingleScanRequests(ClientInfo ci) { 668 if (ci != null) { 669 logScanRequest("removeSingleScanRequests", ci, -1, null, null, null); 670 mPendingScans.removeAllForClient(ci); 671 mActiveScans.removeAllForClient(ci); 672 } 673 } 674 675 void tryToStartNewScan() { 676 if (mPendingScans.size() == 0) { // no pending requests 677 return; 678 } 679 mChannelHelper.updateChannels(); 680 // TODO move merging logic to a scheduler 681 WifiNative.ScanSettings settings = new WifiNative.ScanSettings(); 682 settings.num_buckets = 1; 683 WifiNative.BucketSettings bucketSettings = new WifiNative.BucketSettings(); 684 bucketSettings.bucket = 0; 685 bucketSettings.period_ms = 0; 686 bucketSettings.report_events = WifiScanner.REPORT_EVENT_AFTER_EACH_SCAN; 687 688 ChannelCollection channels = mChannelHelper.createChannelCollection(); 689 HashSet<Integer> hiddenNetworkIdSet = new HashSet<>(); 690 for (RequestInfo<ScanSettings> entry : mPendingScans) { 691 channels.addChannels(entry.settings); 692 if (entry.settings.hiddenNetworkIds != null) { 693 for (int i = 0; i < entry.settings.hiddenNetworkIds.length; i++) { 694 hiddenNetworkIdSet.add(entry.settings.hiddenNetworkIds[i]); 695 } 696 } 697 if ((entry.settings.reportEvents & WifiScanner.REPORT_EVENT_FULL_SCAN_RESULT) 698 != 0) { 699 bucketSettings.report_events |= WifiScanner.REPORT_EVENT_FULL_SCAN_RESULT; 700 } 701 } 702 if (hiddenNetworkIdSet.size() > 0) { 703 settings.hiddenNetworkIds = new int[hiddenNetworkIdSet.size()]; 704 int numHiddenNetworks = 0; 705 for (Integer hiddenNetworkId : hiddenNetworkIdSet) { 706 settings.hiddenNetworkIds[numHiddenNetworks++] = hiddenNetworkId; 707 } 708 } 709 710 channels.fillBucketSettings(bucketSettings, Integer.MAX_VALUE); 711 712 settings.buckets = new WifiNative.BucketSettings[] {bucketSettings}; 713 if (mScannerImpl.startSingleScan(settings, this)) { 714 // swap pending and active scan requests 715 RequestList<ScanSettings> tmp = mActiveScans; 716 mActiveScans = mPendingScans; 717 mPendingScans = tmp; 718 // make sure that the pending list is clear 719 mPendingScans.clear(); 720 transitionTo(mScanningState); 721 } else { 722 mWifiMetrics.incrementScanReturnEntry( 723 WifiMetricsProto.WifiLog.SCAN_UNKNOWN, mPendingScans.size()); 724 // notify and cancel failed scans 725 sendOpFailedToAllAndClear(mPendingScans, WifiScanner.REASON_UNSPECIFIED, 726 "Failed to start single scan"); 727 } 728 } 729 730 void sendOpFailedToAllAndClear(RequestList<?> clientHandlers, int reason, 731 String description) { 732 for (RequestInfo<?> entry : clientHandlers) { 733 logCallback("singleScanFailed", entry.clientInfo, entry.handlerId, 734 "reason=" + reason + ", " + description); 735 entry.reportEvent(WifiScanner.CMD_OP_FAILED, 0, 736 new WifiScanner.OperationResult(reason, description)); 737 } 738 clientHandlers.clear(); 739 } 740 741 void reportFullScanResult(ScanResult result, int bucketsScanned) { 742 for (RequestInfo<ScanSettings> entry : mActiveScans) { 743 if (ScanScheduleUtil.shouldReportFullScanResultForSettings(mChannelHelper, 744 result, bucketsScanned, entry.settings, -1)) { 745 entry.reportEvent(WifiScanner.CMD_FULL_SCAN_RESULT, 0, result); 746 } 747 } 748 } 749 750 void reportScanResults(ScanData results) { 751 if (results != null && results.getResults() != null) { 752 if (results.getResults().length > 0) { 753 mWifiMetrics.incrementNonEmptyScanResultCount(); 754 } else { 755 mWifiMetrics.incrementEmptyScanResultCount(); 756 } 757 } 758 for (RequestInfo<ScanSettings> entry : mActiveScans) { 759 ScanData[] resultsArray = new ScanData[] {results}; 760 ScanData[] resultsToDeliver = ScanScheduleUtil.filterResultsForSettings( 761 mChannelHelper, resultsArray, entry.settings, -1); 762 WifiScanner.ParcelableScanData parcelableScanData = 763 new WifiScanner.ParcelableScanData(resultsToDeliver); 764 logCallback("singleScanResults", entry.clientInfo, entry.handlerId, 765 describeForLog(resultsToDeliver)); 766 entry.reportEvent(WifiScanner.CMD_SCAN_RESULT, 0, parcelableScanData); 767 // make sure the handler is removed 768 entry.reportEvent(WifiScanner.CMD_SINGLE_SCAN_COMPLETED, 0, null); 769 } 770 } 771 } 772 773 class WifiBackgroundScanStateMachine extends StateMachine 774 implements WifiNative.ScanEventHandler, WifiNative.HotlistEventHandler { 775 776 private final DefaultState mDefaultState = new DefaultState(); 777 private final StartedState mStartedState = new StartedState(); 778 private final PausedState mPausedState = new PausedState(); 779 780 private final RequestList<ScanSettings> mActiveBackgroundScans = new RequestList<>(); 781 private final RequestList<WifiScanner.HotlistSettings> mActiveHotlistSettings = 782 new RequestList<>(); 783 784 WifiBackgroundScanStateMachine(Looper looper) { 785 super("WifiBackgroundScanStateMachine", looper); 786 787 setLogRecSize(512); 788 setLogOnlyTransitions(false); 789 790 // CHECKSTYLE:OFF IndentationCheck 791 addState(mDefaultState); 792 addState(mStartedState, mDefaultState); 793 addState(mPausedState, mDefaultState); 794 // CHECKSTYLE:ON IndentationCheck 795 796 setInitialState(mDefaultState); 797 } 798 799 public Collection<ScanSettings> getBackgroundScanSettings(ClientInfo ci) { 800 return mActiveBackgroundScans.getAllSettingsForClient(ci); 801 } 802 803 public void removeBackgroundScanSettings(ClientInfo ci) { 804 mActiveBackgroundScans.removeAllForClient(ci); 805 updateSchedule(); 806 } 807 808 public void removeHotlistSettings(ClientInfo ci) { 809 mActiveHotlistSettings.removeAllForClient(ci); 810 resetHotlist(); 811 } 812 813 @Override 814 public void onScanStatus(int event) { 815 if (DBG) localLog("onScanStatus event received, event=" + event); 816 switch(event) { 817 case WifiNative.WIFI_SCAN_RESULTS_AVAILABLE: 818 case WifiNative.WIFI_SCAN_THRESHOLD_NUM_SCANS: 819 case WifiNative.WIFI_SCAN_THRESHOLD_PERCENT: 820 sendMessage(CMD_SCAN_RESULTS_AVAILABLE); 821 break; 822 case WifiNative.WIFI_SCAN_FAILED: 823 sendMessage(CMD_SCAN_FAILED); 824 break; 825 default: 826 Log.e(TAG, "Unknown scan status event: " + event); 827 break; 828 } 829 } 830 831 @Override 832 public void onFullScanResult(ScanResult fullScanResult, int bucketsScanned) { 833 if (DBG) localLog("onFullScanResult received"); 834 sendMessage(CMD_FULL_SCAN_RESULTS, 0, bucketsScanned, fullScanResult); 835 } 836 837 @Override 838 public void onScanPaused(ScanData scanData[]) { 839 if (DBG) localLog("onScanPaused received"); 840 sendMessage(CMD_SCAN_PAUSED, scanData); 841 } 842 843 @Override 844 public void onScanRestarted() { 845 if (DBG) localLog("onScanRestarted received"); 846 sendMessage(CMD_SCAN_RESTARTED); 847 } 848 849 @Override 850 public void onHotlistApFound(ScanResult[] results) { 851 if (DBG) localLog("onHotlistApFound event received"); 852 sendMessage(CMD_HOTLIST_AP_FOUND, 0, 0, results); 853 } 854 855 @Override 856 public void onHotlistApLost(ScanResult[] results) { 857 if (DBG) localLog("onHotlistApLost event received"); 858 sendMessage(CMD_HOTLIST_AP_LOST, 0, 0, results); 859 } 860 861 class DefaultState extends State { 862 @Override 863 public void enter() { 864 if (DBG) localLog("DefaultState"); 865 mActiveBackgroundScans.clear(); 866 mActiveHotlistSettings.clear(); 867 } 868 869 @Override 870 public boolean processMessage(Message msg) { 871 switch (msg.what) { 872 case CMD_DRIVER_LOADED: 873 // TODO this should be moved to a common location since it is used outside 874 // of this state machine. It is ok right now because the driver loaded event 875 // is sent to this state machine first. 876 if (mScannerImpl == null) { 877 mScannerImpl = mScannerImplFactory.create(mContext, mLooper, mClock); 878 mChannelHelper = mScannerImpl.getChannelHelper(); 879 } 880 881 mBackgroundScheduler = new BackgroundScanScheduler(mChannelHelper); 882 883 WifiNative.ScanCapabilities capabilities = 884 new WifiNative.ScanCapabilities(); 885 if (!mScannerImpl.getScanCapabilities(capabilities)) { 886 loge("could not get scan capabilities"); 887 return HANDLED; 888 } 889 mBackgroundScheduler.setMaxBuckets(capabilities.max_scan_buckets); 890 mBackgroundScheduler.setMaxApPerScan(capabilities.max_ap_cache_per_scan); 891 892 Log.i(TAG, "wifi driver loaded with scan capabilities: " 893 + "max buckets=" + capabilities.max_scan_buckets); 894 895 transitionTo(mStartedState); 896 return HANDLED; 897 case CMD_DRIVER_UNLOADED: 898 Log.i(TAG, "wifi driver unloaded"); 899 transitionTo(mDefaultState); 900 break; 901 case WifiScanner.CMD_START_BACKGROUND_SCAN: 902 case WifiScanner.CMD_STOP_BACKGROUND_SCAN: 903 case WifiScanner.CMD_START_SINGLE_SCAN: 904 case WifiScanner.CMD_STOP_SINGLE_SCAN: 905 case WifiScanner.CMD_SET_HOTLIST: 906 case WifiScanner.CMD_RESET_HOTLIST: 907 case WifiScanner.CMD_GET_SCAN_RESULTS: 908 replyFailed(msg, WifiScanner.REASON_UNSPECIFIED, "not available"); 909 break; 910 911 case CMD_SCAN_RESULTS_AVAILABLE: 912 if (DBG) localLog("ignored scan results available event"); 913 break; 914 915 case CMD_FULL_SCAN_RESULTS: 916 if (DBG) localLog("ignored full scan result event"); 917 break; 918 919 default: 920 break; 921 } 922 923 return HANDLED; 924 } 925 } 926 927 class StartedState extends State { 928 929 @Override 930 public void enter() { 931 if (DBG) localLog("StartedState"); 932 } 933 934 @Override 935 public void exit() { 936 sendBackgroundScanFailedToAllAndClear( 937 WifiScanner.REASON_UNSPECIFIED, "Scan was interrupted"); 938 sendHotlistFailedToAllAndClear( 939 WifiScanner.REASON_UNSPECIFIED, "Scan was interrupted"); 940 mScannerImpl.cleanup(); 941 } 942 943 @Override 944 public boolean processMessage(Message msg) { 945 ClientInfo ci = mClients.get(msg.replyTo); 946 947 switch (msg.what) { 948 case CMD_DRIVER_LOADED: 949 return NOT_HANDLED; 950 case CMD_DRIVER_UNLOADED: 951 return NOT_HANDLED; 952 case WifiScanner.CMD_START_BACKGROUND_SCAN: { 953 mWifiMetrics.incrementBackgroundScanCount(); 954 Bundle scanParams = (Bundle) msg.obj; 955 if (scanParams == null) { 956 replyFailed(msg, WifiScanner.REASON_INVALID_REQUEST, "params null"); 957 return HANDLED; 958 } 959 scanParams.setDefusable(true); 960 ScanSettings scanSettings = 961 scanParams.getParcelable(WifiScanner.SCAN_PARAMS_SCAN_SETTINGS_KEY); 962 WorkSource workSource = 963 scanParams.getParcelable(WifiScanner.SCAN_PARAMS_WORK_SOURCE_KEY); 964 if (addBackgroundScanRequest(ci, msg.arg2, scanSettings, workSource)) { 965 replySucceeded(msg); 966 } else { 967 replyFailed(msg, WifiScanner.REASON_INVALID_REQUEST, "bad request"); 968 } 969 break; 970 } 971 case WifiScanner.CMD_STOP_BACKGROUND_SCAN: 972 removeBackgroundScanRequest(ci, msg.arg2); 973 break; 974 case WifiScanner.CMD_GET_SCAN_RESULTS: 975 reportScanResults(mScannerImpl.getLatestBatchedScanResults(true)); 976 replySucceeded(msg); 977 break; 978 case WifiScanner.CMD_SET_HOTLIST: 979 addHotlist(ci, msg.arg2, (WifiScanner.HotlistSettings) msg.obj); 980 replySucceeded(msg); 981 break; 982 case WifiScanner.CMD_RESET_HOTLIST: 983 removeHotlist(ci, msg.arg2); 984 break; 985 case CMD_SCAN_RESULTS_AVAILABLE: 986 reportScanResults(mScannerImpl.getLatestBatchedScanResults(true)); 987 break; 988 case CMD_FULL_SCAN_RESULTS: 989 reportFullScanResult((ScanResult) msg.obj, /* bucketsScanned */ msg.arg2); 990 break; 991 case CMD_HOTLIST_AP_FOUND: 992 reportHotlistResults(WifiScanner.CMD_AP_FOUND, (ScanResult[]) msg.obj); 993 break; 994 case CMD_HOTLIST_AP_LOST: 995 reportHotlistResults(WifiScanner.CMD_AP_LOST, (ScanResult[]) msg.obj); 996 break; 997 case CMD_SCAN_PAUSED: 998 reportScanResults((ScanData[]) msg.obj); 999 transitionTo(mPausedState); 1000 break; 1001 case CMD_SCAN_FAILED: 1002 Log.e(TAG, "WifiScanner background scan gave CMD_SCAN_FAILED"); 1003 sendBackgroundScanFailedToAllAndClear( 1004 WifiScanner.REASON_UNSPECIFIED, "Background Scan failed"); 1005 break; 1006 default: 1007 return NOT_HANDLED; 1008 } 1009 1010 return HANDLED; 1011 } 1012 } 1013 1014 class PausedState extends State { 1015 @Override 1016 public void enter() { 1017 if (DBG) localLog("PausedState"); 1018 } 1019 1020 @Override 1021 public boolean processMessage(Message msg) { 1022 switch (msg.what) { 1023 case CMD_SCAN_RESTARTED: 1024 transitionTo(mStartedState); 1025 break; 1026 default: 1027 deferMessage(msg); 1028 break; 1029 } 1030 return HANDLED; 1031 } 1032 } 1033 1034 private boolean addBackgroundScanRequest(ClientInfo ci, int handler, 1035 ScanSettings settings, WorkSource workSource) { 1036 // sanity check the input 1037 if (ci == null) { 1038 Log.d(TAG, "Failing scan request ClientInfo not found " + handler); 1039 return false; 1040 } 1041 if (settings.periodInMs < WifiScanner.MIN_SCAN_PERIOD_MS) { 1042 loge("Failing scan request because periodInMs is " + settings.periodInMs 1043 + ", min scan period is: " + WifiScanner.MIN_SCAN_PERIOD_MS); 1044 return false; 1045 } 1046 1047 if (settings.band == WifiScanner.WIFI_BAND_UNSPECIFIED && settings.channels == null) { 1048 loge("Channels was null with unspecified band"); 1049 return false; 1050 } 1051 1052 if (settings.band == WifiScanner.WIFI_BAND_UNSPECIFIED 1053 && settings.channels.length == 0) { 1054 loge("No channels specified"); 1055 return false; 1056 } 1057 1058 int minSupportedPeriodMs = mChannelHelper.estimateScanDuration(settings); 1059 if (settings.periodInMs < minSupportedPeriodMs) { 1060 loge("Failing scan request because minSupportedPeriodMs is " 1061 + minSupportedPeriodMs + " but the request wants " + settings.periodInMs); 1062 return false; 1063 } 1064 1065 // check truncated binary exponential back off scan settings 1066 if (settings.maxPeriodInMs != 0 && settings.maxPeriodInMs != settings.periodInMs) { 1067 if (settings.maxPeriodInMs < settings.periodInMs) { 1068 loge("Failing scan request because maxPeriodInMs is " + settings.maxPeriodInMs 1069 + " but less than periodInMs " + settings.periodInMs); 1070 return false; 1071 } 1072 if (settings.maxPeriodInMs > WifiScanner.MAX_SCAN_PERIOD_MS) { 1073 loge("Failing scan request because maxSupportedPeriodMs is " 1074 + WifiScanner.MAX_SCAN_PERIOD_MS + " but the request wants " 1075 + settings.maxPeriodInMs); 1076 return false; 1077 } 1078 if (settings.stepCount < 1) { 1079 loge("Failing scan request because stepCount is " + settings.stepCount 1080 + " which is less than 1"); 1081 return false; 1082 } 1083 } 1084 1085 logScanRequest("addBackgroundScanRequest", ci, handler, null, settings, null); 1086 mActiveBackgroundScans.addRequest(ci, handler, workSource, settings); 1087 1088 if (updateSchedule()) { 1089 return true; 1090 } else { 1091 mActiveBackgroundScans.removeRequest(ci, handler); 1092 localLog("Failing scan request because failed to reset scan"); 1093 return false; 1094 } 1095 } 1096 1097 private boolean updateSchedule() { 1098 mChannelHelper.updateChannels(); 1099 Collection<ScanSettings> settings = mActiveBackgroundScans.getAllSettings(); 1100 1101 mBackgroundScheduler.updateSchedule(settings); 1102 WifiNative.ScanSettings schedule = mBackgroundScheduler.getSchedule(); 1103 1104 if (ScanScheduleUtil.scheduleEquals(mPreviousSchedule, schedule)) { 1105 if (DBG) Log.d(TAG, "schedule updated with no change"); 1106 return true; 1107 } 1108 1109 mPreviousSchedule = schedule; 1110 1111 if (schedule.num_buckets == 0) { 1112 mScannerImpl.stopBatchedScan(); 1113 if (DBG) Log.d(TAG, "scan stopped"); 1114 return true; 1115 } else { 1116 Log.d(TAG, "starting scan: " 1117 + "base period=" + schedule.base_period_ms 1118 + ", max ap per scan=" + schedule.max_ap_per_scan 1119 + ", batched scans=" + schedule.report_threshold_num_scans); 1120 for (int b = 0; b < schedule.num_buckets; b++) { 1121 WifiNative.BucketSettings bucket = schedule.buckets[b]; 1122 Log.d(TAG, "bucket " + bucket.bucket + " (" + bucket.period_ms + "ms)" 1123 + "[" + bucket.report_events + "]: " 1124 + ChannelHelper.toString(bucket)); 1125 } 1126 1127 if (mScannerImpl.startBatchedScan(schedule, this)) { 1128 if (DBG) { 1129 Log.d(TAG, "scan restarted with " + schedule.num_buckets 1130 + " bucket(s) and base period: " + schedule.base_period_ms); 1131 } 1132 return true; 1133 } else { 1134 mPreviousSchedule = null; 1135 loge("error starting scan: " 1136 + "base period=" + schedule.base_period_ms 1137 + ", max ap per scan=" + schedule.max_ap_per_scan 1138 + ", batched scans=" + schedule.report_threshold_num_scans); 1139 for (int b = 0; b < schedule.num_buckets; b++) { 1140 WifiNative.BucketSettings bucket = schedule.buckets[b]; 1141 loge("bucket " + bucket.bucket + " (" + bucket.period_ms + "ms)" 1142 + "[" + bucket.report_events + "]: " 1143 + ChannelHelper.toString(bucket)); 1144 } 1145 return false; 1146 } 1147 } 1148 } 1149 1150 private void removeBackgroundScanRequest(ClientInfo ci, int handler) { 1151 if (ci != null) { 1152 ScanSettings settings = mActiveBackgroundScans.removeRequest(ci, handler); 1153 logScanRequest("removeBackgroundScanRequest", ci, handler, null, settings, null); 1154 updateSchedule(); 1155 } 1156 } 1157 1158 private void reportFullScanResult(ScanResult result, int bucketsScanned) { 1159 for (RequestInfo<ScanSettings> entry : mActiveBackgroundScans) { 1160 ClientInfo ci = entry.clientInfo; 1161 int handler = entry.handlerId; 1162 ScanSettings settings = entry.settings; 1163 if (mBackgroundScheduler.shouldReportFullScanResultForSettings( 1164 result, bucketsScanned, settings)) { 1165 ScanResult newResult = new ScanResult(result); 1166 if (result.informationElements != null) { 1167 newResult.informationElements = result.informationElements.clone(); 1168 } 1169 else { 1170 newResult.informationElements = null; 1171 } 1172 ci.reportEvent(WifiScanner.CMD_FULL_SCAN_RESULT, 0, handler, newResult); 1173 } 1174 } 1175 } 1176 1177 private void reportScanResults(ScanData[] results) { 1178 for (ScanData result : results) { 1179 if (result != null && result.getResults() != null) { 1180 if (result.getResults().length > 0) { 1181 mWifiMetrics.incrementNonEmptyScanResultCount(); 1182 } else { 1183 mWifiMetrics.incrementEmptyScanResultCount(); 1184 } 1185 } 1186 } 1187 for (RequestInfo<ScanSettings> entry : mActiveBackgroundScans) { 1188 ClientInfo ci = entry.clientInfo; 1189 int handler = entry.handlerId; 1190 ScanSettings settings = entry.settings; 1191 ScanData[] resultsToDeliver = 1192 mBackgroundScheduler.filterResultsForSettings(results, settings); 1193 if (resultsToDeliver != null) { 1194 logCallback("backgroundScanResults", ci, handler, 1195 describeForLog(resultsToDeliver)); 1196 WifiScanner.ParcelableScanData parcelableScanData = 1197 new WifiScanner.ParcelableScanData(resultsToDeliver); 1198 ci.reportEvent(WifiScanner.CMD_SCAN_RESULT, 0, handler, parcelableScanData); 1199 } 1200 } 1201 } 1202 1203 private void sendBackgroundScanFailedToAllAndClear(int reason, String description) { 1204 for (RequestInfo<ScanSettings> entry : mActiveBackgroundScans) { 1205 ClientInfo ci = entry.clientInfo; 1206 int handler = entry.handlerId; 1207 ci.reportEvent(WifiScanner.CMD_OP_FAILED, 0, handler, 1208 new WifiScanner.OperationResult(reason, description)); 1209 } 1210 mActiveBackgroundScans.clear(); 1211 } 1212 1213 private void addHotlist(ClientInfo ci, int handler, WifiScanner.HotlistSettings settings) { 1214 mActiveHotlistSettings.addRequest(ci, handler, null, settings); 1215 resetHotlist(); 1216 } 1217 1218 private void removeHotlist(ClientInfo ci, int handler) { 1219 mActiveHotlistSettings.removeRequest(ci, handler); 1220 resetHotlist(); 1221 } 1222 1223 private void resetHotlist() { 1224 Collection<WifiScanner.HotlistSettings> settings = 1225 mActiveHotlistSettings.getAllSettings(); 1226 int num_hotlist_ap = 0; 1227 1228 for (WifiScanner.HotlistSettings s : settings) { 1229 num_hotlist_ap += s.bssidInfos.length; 1230 } 1231 1232 if (num_hotlist_ap == 0) { 1233 mScannerImpl.resetHotlist(); 1234 } else { 1235 BssidInfo[] bssidInfos = new BssidInfo[num_hotlist_ap]; 1236 int apLostThreshold = Integer.MAX_VALUE; 1237 int index = 0; 1238 for (WifiScanner.HotlistSettings s : settings) { 1239 for (int i = 0; i < s.bssidInfos.length; i++, index++) { 1240 bssidInfos[index] = s.bssidInfos[i]; 1241 } 1242 if (s.apLostThreshold < apLostThreshold) { 1243 apLostThreshold = s.apLostThreshold; 1244 } 1245 } 1246 1247 WifiScanner.HotlistSettings mergedSettings = new WifiScanner.HotlistSettings(); 1248 mergedSettings.bssidInfos = bssidInfos; 1249 mergedSettings.apLostThreshold = apLostThreshold; 1250 mScannerImpl.setHotlist(mergedSettings, this); 1251 } 1252 } 1253 1254 private void reportHotlistResults(int what, ScanResult[] results) { 1255 if (DBG) localLog("reportHotlistResults " + what + " results " + results.length); 1256 for (RequestInfo<WifiScanner.HotlistSettings> entry : mActiveHotlistSettings) { 1257 ClientInfo ci = entry.clientInfo; 1258 int handler = entry.handlerId; 1259 WifiScanner.HotlistSettings settings = entry.settings; 1260 int num_results = 0; 1261 for (ScanResult result : results) { 1262 for (BssidInfo BssidInfo : settings.bssidInfos) { 1263 if (result.BSSID.equalsIgnoreCase(BssidInfo.bssid)) { 1264 num_results++; 1265 break; 1266 } 1267 } 1268 } 1269 if (num_results == 0) { 1270 // nothing to report 1271 return; 1272 } 1273 ScanResult[] results2 = new ScanResult[num_results]; 1274 int index = 0; 1275 for (ScanResult result : results) { 1276 for (BssidInfo BssidInfo : settings.bssidInfos) { 1277 if (result.BSSID.equalsIgnoreCase(BssidInfo.bssid)) { 1278 results2[index] = result; 1279 index++; 1280 } 1281 } 1282 } 1283 WifiScanner.ParcelableScanResults parcelableScanResults = 1284 new WifiScanner.ParcelableScanResults(results2); 1285 1286 ci.reportEvent(what, 0, handler, parcelableScanResults); 1287 } 1288 } 1289 1290 private void sendHotlistFailedToAllAndClear(int reason, String description) { 1291 for (RequestInfo<WifiScanner.HotlistSettings> entry : mActiveHotlistSettings) { 1292 ClientInfo ci = entry.clientInfo; 1293 int handler = entry.handlerId; 1294 ci.reportEvent(WifiScanner.CMD_OP_FAILED, 0, handler, 1295 new WifiScanner.OperationResult(reason, description)); 1296 } 1297 mActiveHotlistSettings.clear(); 1298 } 1299 } 1300 1301 /** 1302 * PNO scan state machine has 5 states: 1303 * -Default State 1304 * -Started State 1305 * -Hw Pno Scan state 1306 * -Single Scan state 1307 * -Sw Pno Scan state 1308 * 1309 * These are the main state transitions: 1310 * 1. Start at |Default State| 1311 * 2. Move to |Started State| when we get the |WIFI_SCAN_AVAILABLE| broadcast from WifiManager. 1312 * 3. When a new PNO scan request comes in: 1313 * a.1. Switch to |Hw Pno Scan state| when the device supports HW PNO 1314 * (This could either be HAL based ePNO or supplicant based PNO). 1315 * a.2. In |Hw Pno Scan state| when PNO scan results are received, check if the result 1316 * contains IE (information elements). If yes, send the results to the client, else 1317 * switch to |Single Scan state| and send the result to the client when the scan result 1318 * is obtained. 1319 * b.1. Switch to |Sw Pno Scan state| when the device does not supports HW PNO 1320 * (This is for older devices which do not support HW PNO and for connected PNO on 1321 * devices which support supplicant based PNO) 1322 * b.2. In |Sw Pno Scan state| send the result to the client when the background scan result 1323 * is obtained 1324 * 1325 * Note: PNO scans only work for a single client today. We don't have support in HW to support 1326 * multiple requests at the same time, so will need non-trivial changes to support (if at all 1327 * possible) in WifiScanningService. 1328 */ 1329 class WifiPnoScanStateMachine extends StateMachine implements WifiNative.PnoEventHandler { 1330 1331 private final DefaultState mDefaultState = new DefaultState(); 1332 private final StartedState mStartedState = new StartedState(); 1333 private final HwPnoScanState mHwPnoScanState = new HwPnoScanState(); 1334 private final SwPnoScanState mSwPnoScanState = new SwPnoScanState(); 1335 private final SingleScanState mSingleScanState = new SingleScanState(); 1336 private InternalClientInfo mInternalClientInfo; 1337 1338 private final RequestList<Pair<PnoSettings, ScanSettings>> mActivePnoScans = 1339 new RequestList<>(); 1340 1341 WifiPnoScanStateMachine(Looper looper) { 1342 super("WifiPnoScanStateMachine", looper); 1343 1344 setLogRecSize(512); 1345 setLogOnlyTransitions(false); 1346 1347 // CHECKSTYLE:OFF IndentationCheck 1348 addState(mDefaultState); 1349 addState(mStartedState, mDefaultState); 1350 addState(mHwPnoScanState, mStartedState); 1351 addState(mSingleScanState, mHwPnoScanState); 1352 addState(mSwPnoScanState, mStartedState); 1353 // CHECKSTYLE:ON IndentationCheck 1354 1355 setInitialState(mDefaultState); 1356 } 1357 1358 public void removePnoSettings(ClientInfo ci) { 1359 mActivePnoScans.removeAllForClient(ci); 1360 transitionTo(mStartedState); 1361 } 1362 1363 @Override 1364 public void onPnoNetworkFound(ScanResult[] results) { 1365 if (DBG) localLog("onWifiPnoNetworkFound event received"); 1366 sendMessage(CMD_PNO_NETWORK_FOUND, 0, 0, results); 1367 } 1368 1369 @Override 1370 public void onPnoScanFailed() { 1371 if (DBG) localLog("onWifiPnoScanFailed event received"); 1372 sendMessage(CMD_PNO_SCAN_FAILED, 0, 0, null); 1373 } 1374 1375 class DefaultState extends State { 1376 @Override 1377 public void enter() { 1378 if (DBG) localLog("DefaultState"); 1379 } 1380 1381 @Override 1382 public boolean processMessage(Message msg) { 1383 switch (msg.what) { 1384 case CMD_DRIVER_LOADED: 1385 transitionTo(mStartedState); 1386 break; 1387 case CMD_DRIVER_UNLOADED: 1388 transitionTo(mDefaultState); 1389 break; 1390 case WifiScanner.CMD_START_PNO_SCAN: 1391 case WifiScanner.CMD_STOP_PNO_SCAN: 1392 replyFailed(msg, WifiScanner.REASON_UNSPECIFIED, "not available"); 1393 break; 1394 case CMD_PNO_NETWORK_FOUND: 1395 case CMD_PNO_SCAN_FAILED: 1396 case WifiScanner.CMD_SCAN_RESULT: 1397 case WifiScanner.CMD_OP_FAILED: 1398 loge("Unexpected message " + msg.what); 1399 break; 1400 default: 1401 return NOT_HANDLED; 1402 } 1403 return HANDLED; 1404 } 1405 } 1406 1407 class StartedState extends State { 1408 @Override 1409 public void enter() { 1410 if (DBG) localLog("StartedState"); 1411 } 1412 1413 @Override 1414 public void exit() { 1415 sendPnoScanFailedToAllAndClear( 1416 WifiScanner.REASON_UNSPECIFIED, "Scan was interrupted"); 1417 } 1418 1419 @Override 1420 public boolean processMessage(Message msg) { 1421 ClientInfo ci = mClients.get(msg.replyTo); 1422 switch (msg.what) { 1423 case WifiScanner.CMD_START_PNO_SCAN: 1424 Bundle pnoParams = (Bundle) msg.obj; 1425 if (pnoParams == null) { 1426 replyFailed(msg, WifiScanner.REASON_INVALID_REQUEST, "params null"); 1427 return HANDLED; 1428 } 1429 pnoParams.setDefusable(true); 1430 PnoSettings pnoSettings = 1431 pnoParams.getParcelable(WifiScanner.PNO_PARAMS_PNO_SETTINGS_KEY); 1432 // This message is handled after the transition to SwPnoScan/HwPnoScan state 1433 deferMessage(msg); 1434 if (mScannerImpl.isHwPnoSupported(pnoSettings.isConnected)) { 1435 transitionTo(mHwPnoScanState); 1436 } else { 1437 transitionTo(mSwPnoScanState); 1438 } 1439 break; 1440 case WifiScanner.CMD_STOP_PNO_SCAN: 1441 replyFailed(msg, WifiScanner.REASON_UNSPECIFIED, "no scan running"); 1442 break; 1443 default: 1444 return NOT_HANDLED; 1445 } 1446 return HANDLED; 1447 } 1448 } 1449 1450 class HwPnoScanState extends State { 1451 @Override 1452 public void enter() { 1453 if (DBG) localLog("HwPnoScanState"); 1454 } 1455 1456 @Override 1457 public void exit() { 1458 // Reset PNO scan in ScannerImpl before we exit. 1459 mScannerImpl.resetHwPnoList(); 1460 removeInternalClient(); 1461 } 1462 1463 @Override 1464 public boolean processMessage(Message msg) { 1465 ClientInfo ci = mClients.get(msg.replyTo); 1466 switch (msg.what) { 1467 case WifiScanner.CMD_START_PNO_SCAN: 1468 Bundle pnoParams = (Bundle) msg.obj; 1469 if (pnoParams == null) { 1470 replyFailed(msg, WifiScanner.REASON_INVALID_REQUEST, "params null"); 1471 return HANDLED; 1472 } 1473 pnoParams.setDefusable(true); 1474 PnoSettings pnoSettings = 1475 pnoParams.getParcelable(WifiScanner.PNO_PARAMS_PNO_SETTINGS_KEY); 1476 ScanSettings scanSettings = 1477 pnoParams.getParcelable(WifiScanner.PNO_PARAMS_SCAN_SETTINGS_KEY); 1478 if (addHwPnoScanRequest(ci, msg.arg2, scanSettings, pnoSettings)) { 1479 replySucceeded(msg); 1480 } else { 1481 replyFailed(msg, WifiScanner.REASON_INVALID_REQUEST, "bad request"); 1482 transitionTo(mStartedState); 1483 } 1484 break; 1485 case WifiScanner.CMD_STOP_PNO_SCAN: 1486 removeHwPnoScanRequest(ci, msg.arg2); 1487 transitionTo(mStartedState); 1488 break; 1489 case CMD_PNO_NETWORK_FOUND: 1490 ScanResult[] scanResults = ((ScanResult[]) msg.obj); 1491 if (isSingleScanNeeded(scanResults)) { 1492 ScanSettings activeScanSettings = getScanSettings(); 1493 if (activeScanSettings == null) { 1494 sendPnoScanFailedToAllAndClear( 1495 WifiScanner.REASON_UNSPECIFIED, 1496 "couldn't retrieve setting"); 1497 transitionTo(mStartedState); 1498 } else { 1499 addSingleScanRequest(activeScanSettings); 1500 transitionTo(mSingleScanState); 1501 } 1502 } else { 1503 reportPnoNetworkFound((ScanResult[]) msg.obj); 1504 } 1505 break; 1506 case CMD_PNO_SCAN_FAILED: 1507 sendPnoScanFailedToAllAndClear( 1508 WifiScanner.REASON_UNSPECIFIED, "pno scan failed"); 1509 transitionTo(mStartedState); 1510 break; 1511 default: 1512 return NOT_HANDLED; 1513 } 1514 return HANDLED; 1515 } 1516 } 1517 1518 class SingleScanState extends State { 1519 @Override 1520 public void enter() { 1521 if (DBG) localLog("SingleScanState"); 1522 } 1523 1524 @Override 1525 public boolean processMessage(Message msg) { 1526 ClientInfo ci = mClients.get(msg.replyTo); 1527 switch (msg.what) { 1528 case WifiScanner.CMD_SCAN_RESULT: 1529 WifiScanner.ParcelableScanData parcelableScanData = 1530 (WifiScanner.ParcelableScanData) msg.obj; 1531 ScanData[] scanDatas = parcelableScanData.getResults(); 1532 ScanData lastScanData = scanDatas[scanDatas.length - 1]; 1533 reportPnoNetworkFound(lastScanData.getResults()); 1534 transitionTo(mHwPnoScanState); 1535 break; 1536 case WifiScanner.CMD_OP_FAILED: 1537 sendPnoScanFailedToAllAndClear( 1538 WifiScanner.REASON_UNSPECIFIED, "single scan failed"); 1539 transitionTo(mStartedState); 1540 break; 1541 default: 1542 return NOT_HANDLED; 1543 } 1544 return HANDLED; 1545 } 1546 } 1547 1548 class SwPnoScanState extends State { 1549 private final ArrayList<ScanResult> mSwPnoFullScanResults = new ArrayList<>(); 1550 1551 @Override 1552 public void enter() { 1553 if (DBG) localLog("SwPnoScanState"); 1554 mSwPnoFullScanResults.clear(); 1555 } 1556 1557 @Override 1558 public void exit() { 1559 removeInternalClient(); 1560 } 1561 1562 @Override 1563 public boolean processMessage(Message msg) { 1564 ClientInfo ci = mClients.get(msg.replyTo); 1565 switch (msg.what) { 1566 case WifiScanner.CMD_START_PNO_SCAN: 1567 Bundle pnoParams = (Bundle) msg.obj; 1568 if (pnoParams == null) { 1569 replyFailed(msg, WifiScanner.REASON_INVALID_REQUEST, "params null"); 1570 return HANDLED; 1571 } 1572 pnoParams.setDefusable(true); 1573 PnoSettings pnoSettings = 1574 pnoParams.getParcelable(WifiScanner.PNO_PARAMS_PNO_SETTINGS_KEY); 1575 ScanSettings scanSettings = 1576 pnoParams.getParcelable(WifiScanner.PNO_PARAMS_SCAN_SETTINGS_KEY); 1577 if (addSwPnoScanRequest(ci, msg.arg2, scanSettings, pnoSettings)) { 1578 replySucceeded(msg); 1579 } else { 1580 replyFailed(msg, WifiScanner.REASON_INVALID_REQUEST, "bad request"); 1581 transitionTo(mStartedState); 1582 } 1583 break; 1584 case WifiScanner.CMD_STOP_PNO_SCAN: 1585 removeSwPnoScanRequest(ci, msg.arg2); 1586 transitionTo(mStartedState); 1587 break; 1588 case WifiScanner.CMD_FULL_SCAN_RESULT: 1589 // Aggregate full scan results until we get the |CMD_SCAN_RESULT| message 1590 mSwPnoFullScanResults.add((ScanResult) msg.obj); 1591 break; 1592 case WifiScanner.CMD_SCAN_RESULT: 1593 ScanResult[] scanResults = mSwPnoFullScanResults.toArray( 1594 new ScanResult[mSwPnoFullScanResults.size()]); 1595 reportPnoNetworkFound(scanResults); 1596 mSwPnoFullScanResults.clear(); 1597 break; 1598 case WifiScanner.CMD_OP_FAILED: 1599 sendPnoScanFailedToAllAndClear( 1600 WifiScanner.REASON_UNSPECIFIED, "background scan failed"); 1601 transitionTo(mStartedState); 1602 break; 1603 default: 1604 return NOT_HANDLED; 1605 } 1606 return HANDLED; 1607 } 1608 } 1609 1610 private WifiNative.PnoSettings convertPnoSettingsToNative(PnoSettings pnoSettings) { 1611 WifiNative.PnoSettings nativePnoSetting = new WifiNative.PnoSettings(); 1612 nativePnoSetting.min5GHzRssi = pnoSettings.min5GHzRssi; 1613 nativePnoSetting.min24GHzRssi = pnoSettings.min24GHzRssi; 1614 nativePnoSetting.initialScoreMax = pnoSettings.initialScoreMax; 1615 nativePnoSetting.currentConnectionBonus = pnoSettings.currentConnectionBonus; 1616 nativePnoSetting.sameNetworkBonus = pnoSettings.sameNetworkBonus; 1617 nativePnoSetting.secureBonus = pnoSettings.secureBonus; 1618 nativePnoSetting.band5GHzBonus = pnoSettings.band5GHzBonus; 1619 nativePnoSetting.isConnected = pnoSettings.isConnected; 1620 nativePnoSetting.networkList = 1621 new WifiNative.PnoNetwork[pnoSettings.networkList.length]; 1622 for (int i = 0; i < pnoSettings.networkList.length; i++) { 1623 nativePnoSetting.networkList[i] = new WifiNative.PnoNetwork(); 1624 nativePnoSetting.networkList[i].ssid = pnoSettings.networkList[i].ssid; 1625 nativePnoSetting.networkList[i].networkId = pnoSettings.networkList[i].networkId; 1626 nativePnoSetting.networkList[i].priority = pnoSettings.networkList[i].priority; 1627 nativePnoSetting.networkList[i].flags = pnoSettings.networkList[i].flags; 1628 nativePnoSetting.networkList[i].auth_bit_field = 1629 pnoSettings.networkList[i].authBitField; 1630 } 1631 return nativePnoSetting; 1632 } 1633 1634 // Retrieve the only active scan settings. 1635 private ScanSettings getScanSettings() { 1636 for (Pair<PnoSettings, ScanSettings> settingsPair : mActivePnoScans.getAllSettings()) { 1637 return settingsPair.second; 1638 } 1639 return null; 1640 } 1641 1642 private void removeInternalClient() { 1643 if (mInternalClientInfo != null) { 1644 mInternalClientInfo.cleanup(); 1645 mInternalClientInfo = null; 1646 } else { 1647 Log.w(TAG, "No Internal client for PNO"); 1648 } 1649 } 1650 1651 private void addInternalClient(ClientInfo ci) { 1652 if (mInternalClientInfo == null) { 1653 mInternalClientInfo = 1654 new InternalClientInfo(ci.getUid(), new Messenger(this.getHandler())); 1655 mInternalClientInfo.register(); 1656 } else { 1657 Log.w(TAG, "Internal client for PNO already exists"); 1658 } 1659 } 1660 1661 private void addPnoScanRequest(ClientInfo ci, int handler, ScanSettings scanSettings, 1662 PnoSettings pnoSettings) { 1663 mActivePnoScans.addRequest(ci, handler, WifiStateMachine.WIFI_WORK_SOURCE, 1664 Pair.create(pnoSettings, scanSettings)); 1665 addInternalClient(ci); 1666 } 1667 1668 private Pair<PnoSettings, ScanSettings> removePnoScanRequest(ClientInfo ci, int handler) { 1669 Pair<PnoSettings, ScanSettings> settings = mActivePnoScans.removeRequest(ci, handler); 1670 return settings; 1671 } 1672 1673 private boolean addHwPnoScanRequest(ClientInfo ci, int handler, ScanSettings scanSettings, 1674 PnoSettings pnoSettings) { 1675 if (ci == null) { 1676 Log.d(TAG, "Failing scan request ClientInfo not found " + handler); 1677 return false; 1678 } 1679 if (!mActivePnoScans.isEmpty()) { 1680 loge("Failing scan request because there is already an active scan"); 1681 return false; 1682 } 1683 WifiNative.PnoSettings nativePnoSettings = convertPnoSettingsToNative(pnoSettings); 1684 if (!mScannerImpl.setHwPnoList(nativePnoSettings, mPnoScanStateMachine)) { 1685 return false; 1686 } 1687 logScanRequest("addHwPnoScanRequest", ci, handler, null, scanSettings, pnoSettings); 1688 addPnoScanRequest(ci, handler, scanSettings, pnoSettings); 1689 // HW PNO is supported, check if we need a background scan running for this. 1690 if (mScannerImpl.shouldScheduleBackgroundScanForHwPno()) { 1691 addBackgroundScanRequest(scanSettings); 1692 } 1693 return true; 1694 } 1695 1696 private void removeHwPnoScanRequest(ClientInfo ci, int handler) { 1697 if (ci != null) { 1698 Pair<PnoSettings, ScanSettings> settings = removePnoScanRequest(ci, handler); 1699 logScanRequest("removeHwPnoScanRequest", ci, handler, null, 1700 settings.second, settings.first); 1701 } 1702 } 1703 1704 private boolean addSwPnoScanRequest(ClientInfo ci, int handler, ScanSettings scanSettings, 1705 PnoSettings pnoSettings) { 1706 if (ci == null) { 1707 Log.d(TAG, "Failing scan request ClientInfo not found " + handler); 1708 return false; 1709 } 1710 if (!mActivePnoScans.isEmpty()) { 1711 loge("Failing scan request because there is already an active scan"); 1712 return false; 1713 } 1714 logScanRequest("addSwPnoScanRequest", ci, handler, null, scanSettings, pnoSettings); 1715 addPnoScanRequest(ci, handler, scanSettings, pnoSettings); 1716 // HW PNO is not supported, we need to revert to normal background scans and 1717 // report events after each scan and we need full scan results to get the IE information 1718 scanSettings.reportEvents = WifiScanner.REPORT_EVENT_AFTER_EACH_SCAN 1719 | WifiScanner.REPORT_EVENT_FULL_SCAN_RESULT; 1720 addBackgroundScanRequest(scanSettings); 1721 return true; 1722 } 1723 1724 private void removeSwPnoScanRequest(ClientInfo ci, int handler) { 1725 if (ci != null) { 1726 Pair<PnoSettings, ScanSettings> settings = removePnoScanRequest(ci, handler); 1727 logScanRequest("removeSwPnoScanRequest", ci, handler, null, 1728 settings.second, settings.first); 1729 } 1730 } 1731 1732 private void reportPnoNetworkFound(ScanResult[] results) { 1733 WifiScanner.ParcelableScanResults parcelableScanResults = 1734 new WifiScanner.ParcelableScanResults(results); 1735 for (RequestInfo<Pair<PnoSettings, ScanSettings>> entry : mActivePnoScans) { 1736 ClientInfo ci = entry.clientInfo; 1737 int handler = entry.handlerId; 1738 logCallback("pnoNetworkFound", ci, handler, describeForLog(results)); 1739 ci.reportEvent( 1740 WifiScanner.CMD_PNO_NETWORK_FOUND, 0, handler, parcelableScanResults); 1741 } 1742 } 1743 1744 private void sendPnoScanFailedToAllAndClear(int reason, String description) { 1745 for (RequestInfo<Pair<PnoSettings, ScanSettings>> entry : mActivePnoScans) { 1746 ClientInfo ci = entry.clientInfo; 1747 int handler = entry.handlerId; 1748 ci.reportEvent(WifiScanner.CMD_OP_FAILED, 0, handler, 1749 new WifiScanner.OperationResult(reason, description)); 1750 } 1751 mActivePnoScans.clear(); 1752 } 1753 1754 private void addBackgroundScanRequest(ScanSettings settings) { 1755 if (DBG) localLog("Starting background scan"); 1756 if (mInternalClientInfo != null) { 1757 mInternalClientInfo.sendRequestToClientHandler( 1758 WifiScanner.CMD_START_BACKGROUND_SCAN, settings, 1759 WifiStateMachine.WIFI_WORK_SOURCE); 1760 } 1761 } 1762 1763 private void addSingleScanRequest(ScanSettings settings) { 1764 if (DBG) localLog("Starting single scan"); 1765 if (mInternalClientInfo != null) { 1766 mInternalClientInfo.sendRequestToClientHandler( 1767 WifiScanner.CMD_START_SINGLE_SCAN, settings, 1768 WifiStateMachine.WIFI_WORK_SOURCE); 1769 } 1770 } 1771 1772 /** 1773 * Checks if IE are present in scan data, if no single scan is needed to report event to 1774 * client 1775 */ 1776 private boolean isSingleScanNeeded(ScanResult[] scanResults) { 1777 for (ScanResult scanResult : scanResults) { 1778 if (scanResult.informationElements != null 1779 && scanResult.informationElements.length > 0) { 1780 return false; 1781 } 1782 } 1783 return true; 1784 } 1785 } 1786 1787 private abstract class ClientInfo { 1788 private final int mUid; 1789 private final WorkSource mWorkSource; 1790 private boolean mScanWorkReported = false; 1791 protected final Messenger mMessenger; 1792 1793 ClientInfo(int uid, Messenger messenger) { 1794 mUid = uid; 1795 mMessenger = messenger; 1796 mWorkSource = new WorkSource(uid); 1797 } 1798 1799 /** 1800 * Register this client to main client map. 1801 */ 1802 public void register() { 1803 mClients.put(mMessenger, this); 1804 } 1805 1806 /** 1807 * Unregister this client from main client map. 1808 */ 1809 private void unregister() { 1810 mClients.remove(mMessenger); 1811 } 1812 1813 public void cleanup() { 1814 mSingleScanStateMachine.removeSingleScanRequests(this); 1815 mBackgroundScanStateMachine.removeBackgroundScanSettings(this); 1816 mBackgroundScanStateMachine.removeHotlistSettings(this); 1817 unregister(); 1818 localLog("Successfully stopped all requests for client " + this); 1819 } 1820 1821 public int getUid() { 1822 return mUid; 1823 } 1824 1825 public void reportEvent(int what, int arg1, int arg2) { 1826 reportEvent(what, arg1, arg2, null); 1827 } 1828 1829 // This has to be implemented by subclasses to report events back to clients. 1830 public abstract void reportEvent(int what, int arg1, int arg2, Object obj); 1831 1832 // TODO(b/27903217): Blame scan on provided work source 1833 private void reportBatchedScanStart() { 1834 if (mUid == 0) 1835 return; 1836 1837 int csph = getCsph(); 1838 1839 try { 1840 mBatteryStats.noteWifiBatchedScanStartedFromSource(mWorkSource, csph); 1841 } catch (RemoteException e) { 1842 logw("failed to report scan work: " + e.toString()); 1843 } 1844 } 1845 1846 private void reportBatchedScanStop() { 1847 if (mUid == 0) 1848 return; 1849 1850 try { 1851 mBatteryStats.noteWifiBatchedScanStoppedFromSource(mWorkSource); 1852 } catch (RemoteException e) { 1853 logw("failed to cleanup scan work: " + e.toString()); 1854 } 1855 } 1856 1857 // TODO migrate batterystats to accept scan duration per hour instead of csph 1858 private int getCsph() { 1859 int totalScanDurationPerHour = 0; 1860 Collection<ScanSettings> settingsList = 1861 mBackgroundScanStateMachine.getBackgroundScanSettings(this); 1862 for (ScanSettings settings : settingsList) { 1863 int scanDurationMs = mChannelHelper.estimateScanDuration(settings); 1864 int scans_per_Hour = settings.periodInMs == 0 ? 1 : (3600 * 1000) / 1865 settings.periodInMs; 1866 totalScanDurationPerHour += scanDurationMs * scans_per_Hour; 1867 } 1868 1869 return totalScanDurationPerHour / ChannelHelper.SCAN_PERIOD_PER_CHANNEL_MS; 1870 } 1871 1872 public void reportScanWorkUpdate() { 1873 if (mScanWorkReported) { 1874 reportBatchedScanStop(); 1875 mScanWorkReported = false; 1876 } 1877 if (mBackgroundScanStateMachine.getBackgroundScanSettings(this).isEmpty()) { 1878 reportBatchedScanStart(); 1879 mScanWorkReported = true; 1880 } 1881 } 1882 1883 @Override 1884 public String toString() { 1885 return "ClientInfo[uid=" + mUid + "]"; 1886 } 1887 } 1888 1889 /** 1890 * This class is used to represent external clients to the WifiScanning Service. 1891 */ 1892 private class ExternalClientInfo extends ClientInfo { 1893 private final AsyncChannel mChannel; 1894 /** 1895 * Indicates if the client is still connected 1896 * If the client is no longer connected then messages to it will be silently dropped 1897 */ 1898 private boolean mDisconnected = false; 1899 1900 ExternalClientInfo(int uid, Messenger messenger, AsyncChannel c) { 1901 super(uid, messenger); 1902 mChannel = c; 1903 if (DBG) localLog("New client, channel: " + c); 1904 } 1905 1906 @Override 1907 public void reportEvent(int what, int arg1, int arg2, Object obj) { 1908 if (!mDisconnected) { 1909 mChannel.sendMessage(what, arg1, arg2, obj); 1910 } 1911 } 1912 1913 @Override 1914 public void cleanup() { 1915 mDisconnected = true; 1916 // Internal clients should not have any wifi change requests. So, keeping this cleanup 1917 // only for external client because this will otherwise cause an infinite recursion 1918 // when the internal client in WifiChangeStateMachine is cleaned up. 1919 mWifiChangeStateMachine.removeWifiChangeHandler(this); 1920 mPnoScanStateMachine.removePnoSettings(this); 1921 super.cleanup(); 1922 } 1923 } 1924 1925 /** 1926 * This class is used to represent internal clients to the WifiScanning Service. This is needed 1927 * for communicating between State Machines. 1928 * This leaves the onReportEvent method unimplemented, so that the clients have the freedom 1929 * to handle the events as they need. 1930 */ 1931 private class InternalClientInfo extends ClientInfo { 1932 private static final int INTERNAL_CLIENT_HANDLER = 0; 1933 1934 /** 1935 * The UID here is used to proxy the original external requester UID. 1936 */ 1937 InternalClientInfo(int requesterUid, Messenger messenger) { 1938 super(requesterUid, messenger); 1939 } 1940 1941 @Override 1942 public void reportEvent(int what, int arg1, int arg2, Object obj) { 1943 Message message = Message.obtain(); 1944 message.what = what; 1945 message.arg1 = arg1; 1946 message.arg2 = arg2; 1947 message.obj = obj; 1948 try { 1949 mMessenger.send(message); 1950 } catch (RemoteException e) { 1951 loge("Failed to send message: " + what); 1952 } 1953 } 1954 1955 /** 1956 * Send a message to the client handler which should reroute the message to the appropriate 1957 * state machine. 1958 */ 1959 public void sendRequestToClientHandler(int what, ScanSettings settings, 1960 WorkSource workSource) { 1961 Message msg = Message.obtain(); 1962 msg.what = what; 1963 msg.arg2 = INTERNAL_CLIENT_HANDLER; 1964 if (settings != null) { 1965 Bundle bundle = new Bundle(); 1966 bundle.putParcelable(WifiScanner.SCAN_PARAMS_SCAN_SETTINGS_KEY, settings); 1967 bundle.putParcelable(WifiScanner.SCAN_PARAMS_WORK_SOURCE_KEY, workSource); 1968 msg.obj = bundle; 1969 } 1970 msg.replyTo = mMessenger; 1971 msg.sendingUid = getUid(); 1972 mClientHandler.sendMessage(msg); 1973 } 1974 1975 /** 1976 * Send a message to the client handler which should reroute the message to the appropriate 1977 * state machine. 1978 */ 1979 public void sendRequestToClientHandler(int what) { 1980 sendRequestToClientHandler(what, null, null); 1981 } 1982 } 1983 1984 void replySucceeded(Message msg) { 1985 if (msg.replyTo != null) { 1986 Message reply = Message.obtain(); 1987 reply.what = WifiScanner.CMD_OP_SUCCEEDED; 1988 reply.arg2 = msg.arg2; 1989 try { 1990 msg.replyTo.send(reply); 1991 } catch (RemoteException e) { 1992 // There's not much we can do if reply can't be sent! 1993 } 1994 } else { 1995 // locally generated message; doesn't need a reply! 1996 } 1997 } 1998 1999 void replyFailed(Message msg, int reason, String description) { 2000 if (msg.replyTo != null) { 2001 Message reply = Message.obtain(); 2002 reply.what = WifiScanner.CMD_OP_FAILED; 2003 reply.arg2 = msg.arg2; 2004 reply.obj = new WifiScanner.OperationResult(reason, description); 2005 try { 2006 msg.replyTo.send(reply); 2007 } catch (RemoteException e) { 2008 // There's not much we can do if reply can't be sent! 2009 } 2010 } else { 2011 // locally generated message; doesn't need a reply! 2012 } 2013 } 2014 2015 /** 2016 * Wifi Change state machine is used to handle any wifi change tracking requests. 2017 * TODO: This state machine doesn't handle driver loading/unloading yet. 2018 */ 2019 class WifiChangeStateMachine extends StateMachine 2020 implements WifiNative.SignificantWifiChangeEventHandler { 2021 2022 private static final int MAX_APS_TO_TRACK = 3; 2023 private static final int MOVING_SCAN_PERIOD_MS = 10000; 2024 private static final int STATIONARY_SCAN_PERIOD_MS = 5000; 2025 private static final int MOVING_STATE_TIMEOUT_MS = 30000; 2026 2027 State mDefaultState = new DefaultState(); 2028 State mStationaryState = new StationaryState(); 2029 State mMovingState = new MovingState(); 2030 2031 private static final String ACTION_TIMEOUT = 2032 "com.android.server.WifiScanningServiceImpl.action.TIMEOUT"; 2033 private PendingIntent mTimeoutIntent; 2034 private ScanResult[] mCurrentBssids; 2035 private InternalClientInfo mInternalClientInfo; 2036 2037 private final Set<Pair<ClientInfo, Integer>> mActiveWifiChangeHandlers = new HashSet<>(); 2038 2039 WifiChangeStateMachine(Looper looper) { 2040 super("SignificantChangeStateMachine", looper); 2041 2042 // CHECKSTYLE:OFF IndentationCheck 2043 addState(mDefaultState); 2044 addState(mStationaryState, mDefaultState); 2045 addState(mMovingState, mDefaultState); 2046 // CHECKSTYLE:ON IndentationCheck 2047 2048 setInitialState(mDefaultState); 2049 } 2050 2051 public void removeWifiChangeHandler(ClientInfo ci) { 2052 Iterator<Pair<ClientInfo, Integer>> iter = mActiveWifiChangeHandlers.iterator(); 2053 while (iter.hasNext()) { 2054 Pair<ClientInfo, Integer> entry = iter.next(); 2055 if (entry.first == ci) { 2056 iter.remove(); 2057 } 2058 } 2059 untrackSignificantWifiChangeOnEmpty(); 2060 } 2061 2062 class DefaultState extends State { 2063 @Override 2064 public void enter() { 2065 if (DBG) localLog("Entering IdleState"); 2066 } 2067 2068 @Override 2069 public boolean processMessage(Message msg) { 2070 if (DBG) localLog("DefaultState state got " + msg); 2071 ClientInfo ci = mClients.get(msg.replyTo); 2072 switch (msg.what) { 2073 case WifiScanner.CMD_START_TRACKING_CHANGE: 2074 addWifiChangeHandler(ci, msg.arg2); 2075 replySucceeded(msg); 2076 transitionTo(mMovingState); 2077 break; 2078 case WifiScanner.CMD_STOP_TRACKING_CHANGE: 2079 // nothing to do 2080 break; 2081 case WifiScanner.CMD_CONFIGURE_WIFI_CHANGE: 2082 /* save configuration till we transition to moving state */ 2083 deferMessage(msg); 2084 break; 2085 case WifiScanner.CMD_SCAN_RESULT: 2086 // nothing to do 2087 break; 2088 default: 2089 return NOT_HANDLED; 2090 } 2091 return HANDLED; 2092 } 2093 } 2094 2095 class StationaryState extends State { 2096 @Override 2097 public void enter() { 2098 if (DBG) localLog("Entering StationaryState"); 2099 reportWifiStabilized(mCurrentBssids); 2100 } 2101 2102 @Override 2103 public boolean processMessage(Message msg) { 2104 if (DBG) localLog("Stationary state got " + msg); 2105 ClientInfo ci = mClients.get(msg.replyTo); 2106 switch (msg.what) { 2107 case WifiScanner.CMD_START_TRACKING_CHANGE: 2108 addWifiChangeHandler(ci, msg.arg2); 2109 replySucceeded(msg); 2110 break; 2111 case WifiScanner.CMD_STOP_TRACKING_CHANGE: 2112 removeWifiChangeHandler(ci, msg.arg2); 2113 break; 2114 case WifiScanner.CMD_CONFIGURE_WIFI_CHANGE: 2115 /* save configuration till we transition to moving state */ 2116 deferMessage(msg); 2117 break; 2118 case CMD_WIFI_CHANGE_DETECTED: 2119 if (DBG) localLog("Got wifi change detected"); 2120 reportWifiChanged((ScanResult[]) msg.obj); 2121 transitionTo(mMovingState); 2122 break; 2123 case WifiScanner.CMD_SCAN_RESULT: 2124 // nothing to do 2125 break; 2126 default: 2127 return NOT_HANDLED; 2128 } 2129 return HANDLED; 2130 } 2131 } 2132 2133 class MovingState extends State { 2134 boolean mWifiChangeDetected = false; 2135 boolean mScanResultsPending = false; 2136 2137 @Override 2138 public void enter() { 2139 if (DBG) localLog("Entering MovingState"); 2140 if (mTimeoutIntent == null) { 2141 Intent intent = new Intent(ACTION_TIMEOUT, null); 2142 mTimeoutIntent = PendingIntent.getBroadcast(mContext, 0, intent, 0); 2143 2144 mContext.registerReceiver( 2145 new BroadcastReceiver() { 2146 @Override 2147 public void onReceive(Context context, Intent intent) { 2148 sendMessage(CMD_WIFI_CHANGE_TIMEOUT); 2149 } 2150 }, new IntentFilter(ACTION_TIMEOUT)); 2151 } 2152 issueFullScan(); 2153 } 2154 2155 @Override 2156 public boolean processMessage(Message msg) { 2157 if (DBG) localLog("MovingState state got " + msg); 2158 ClientInfo ci = mClients.get(msg.replyTo); 2159 switch (msg.what) { 2160 case WifiScanner.CMD_START_TRACKING_CHANGE: 2161 addWifiChangeHandler(ci, msg.arg2); 2162 replySucceeded(msg); 2163 break; 2164 case WifiScanner.CMD_STOP_TRACKING_CHANGE: 2165 removeWifiChangeHandler(ci, msg.arg2); 2166 break; 2167 case WifiScanner.CMD_CONFIGURE_WIFI_CHANGE: 2168 if (DBG) localLog("Got configuration from app"); 2169 WifiScanner.WifiChangeSettings settings = 2170 (WifiScanner.WifiChangeSettings) msg.obj; 2171 reconfigureScan(settings); 2172 mWifiChangeDetected = false; 2173 long unchangedDelay = settings.unchangedSampleSize * settings.periodInMs; 2174 mAlarmManager.cancel(mTimeoutIntent); 2175 mAlarmManager.setExact(AlarmManager.ELAPSED_REALTIME_WAKEUP, 2176 mClock.elapsedRealtime() + unchangedDelay, 2177 mTimeoutIntent); 2178 break; 2179 case WifiScanner.CMD_SCAN_RESULT: 2180 if (DBG) localLog("Got scan results"); 2181 if (mScanResultsPending) { 2182 if (DBG) localLog("reconfiguring scan"); 2183 reconfigureScan((ScanData[])msg.obj, 2184 STATIONARY_SCAN_PERIOD_MS); 2185 mWifiChangeDetected = false; 2186 mAlarmManager.setExact(AlarmManager.ELAPSED_REALTIME_WAKEUP, 2187 mClock.elapsedRealtime() + MOVING_STATE_TIMEOUT_MS, 2188 mTimeoutIntent); 2189 mScanResultsPending = false; 2190 } 2191 break; 2192 case CMD_WIFI_CHANGE_DETECTED: 2193 if (DBG) localLog("Change detected"); 2194 mAlarmManager.cancel(mTimeoutIntent); 2195 reportWifiChanged((ScanResult[])msg.obj); 2196 mWifiChangeDetected = true; 2197 issueFullScan(); 2198 break; 2199 case CMD_WIFI_CHANGE_TIMEOUT: 2200 if (DBG) localLog("Got timeout event"); 2201 if (mWifiChangeDetected == false) { 2202 transitionTo(mStationaryState); 2203 } 2204 break; 2205 default: 2206 return NOT_HANDLED; 2207 } 2208 return HANDLED; 2209 } 2210 2211 @Override 2212 public void exit() { 2213 mAlarmManager.cancel(mTimeoutIntent); 2214 } 2215 2216 void issueFullScan() { 2217 if (DBG) localLog("Issuing full scan"); 2218 ScanSettings settings = new ScanSettings(); 2219 settings.band = WifiScanner.WIFI_BAND_BOTH; 2220 settings.periodInMs = MOVING_SCAN_PERIOD_MS; 2221 settings.reportEvents = WifiScanner.REPORT_EVENT_AFTER_EACH_SCAN; 2222 addScanRequest(settings); 2223 mScanResultsPending = true; 2224 } 2225 2226 } 2227 2228 private void reconfigureScan(ScanData[] results, int period) { 2229 // find brightest APs and set them as sentinels 2230 if (results.length < MAX_APS_TO_TRACK) { 2231 localLog("too few APs (" + results.length + ") available to track wifi change"); 2232 return; 2233 } 2234 2235 removeScanRequest(); 2236 2237 // remove duplicate BSSIDs 2238 HashMap<String, ScanResult> bssidToScanResult = new HashMap<String, ScanResult>(); 2239 for (ScanResult result : results[0].getResults()) { 2240 ScanResult saved = bssidToScanResult.get(result.BSSID); 2241 if (saved == null) { 2242 bssidToScanResult.put(result.BSSID, result); 2243 } else if (saved.level > result.level) { 2244 bssidToScanResult.put(result.BSSID, result); 2245 } 2246 } 2247 2248 // find brightest BSSIDs 2249 ScanResult brightest[] = new ScanResult[MAX_APS_TO_TRACK]; 2250 Collection<ScanResult> results2 = bssidToScanResult.values(); 2251 for (ScanResult result : results2) { 2252 for (int j = 0; j < brightest.length; j++) { 2253 if (brightest[j] == null 2254 || (brightest[j].level < result.level)) { 2255 for (int k = brightest.length; k > (j + 1); k--) { 2256 brightest[k - 1] = brightest[k - 2]; 2257 } 2258 brightest[j] = result; 2259 break; 2260 } 2261 } 2262 } 2263 2264 // Get channels to scan for 2265 ArrayList<Integer> channels = new ArrayList<Integer>(); 2266 for (int i = 0; i < brightest.length; i++) { 2267 boolean found = false; 2268 for (int j = i + 1; j < brightest.length; j++) { 2269 if (brightest[j].frequency == brightest[i].frequency) { 2270 found = true; 2271 } 2272 } 2273 if (!found) { 2274 channels.add(brightest[i].frequency); 2275 } 2276 } 2277 2278 if (DBG) localLog("Found " + channels.size() + " channels"); 2279 2280 // set scanning schedule 2281 ScanSettings settings = new ScanSettings(); 2282 settings.band = WifiScanner.WIFI_BAND_UNSPECIFIED; 2283 settings.channels = new ChannelSpec[channels.size()]; 2284 for (int i = 0; i < channels.size(); i++) { 2285 settings.channels[i] = new ChannelSpec(channels.get(i)); 2286 } 2287 2288 settings.periodInMs = period; 2289 addScanRequest(settings); 2290 2291 WifiScanner.WifiChangeSettings settings2 = new WifiScanner.WifiChangeSettings(); 2292 settings2.rssiSampleSize = 3; 2293 settings2.lostApSampleSize = 3; 2294 settings2.unchangedSampleSize = 3; 2295 settings2.minApsBreachingThreshold = 2; 2296 settings2.bssidInfos = new BssidInfo[brightest.length]; 2297 2298 for (int i = 0; i < brightest.length; i++) { 2299 BssidInfo BssidInfo = new BssidInfo(); 2300 BssidInfo.bssid = brightest[i].BSSID; 2301 int threshold = (100 + brightest[i].level) / 32 + 2; 2302 BssidInfo.low = brightest[i].level - threshold; 2303 BssidInfo.high = brightest[i].level + threshold; 2304 settings2.bssidInfos[i] = BssidInfo; 2305 2306 if (DBG) localLog("Setting bssid=" + BssidInfo.bssid + ", " + 2307 "low=" + BssidInfo.low + ", high=" + BssidInfo.high); 2308 } 2309 2310 trackSignificantWifiChange(settings2); 2311 mCurrentBssids = brightest; 2312 } 2313 2314 private void reconfigureScan(WifiScanner.WifiChangeSettings settings) { 2315 2316 if (settings.bssidInfos.length < MAX_APS_TO_TRACK) { 2317 localLog("too few APs (" + settings.bssidInfos.length 2318 + ") available to track wifi change"); 2319 return; 2320 } 2321 2322 if (DBG) localLog("Setting configuration specified by app"); 2323 2324 mCurrentBssids = new ScanResult[settings.bssidInfos.length]; 2325 HashSet<Integer> channels = new HashSet<Integer>(); 2326 2327 for (int i = 0; i < settings.bssidInfos.length; i++) { 2328 ScanResult result = new ScanResult(); 2329 result.BSSID = settings.bssidInfos[i].bssid; 2330 mCurrentBssids[i] = result; 2331 channels.add(settings.bssidInfos[i].frequencyHint); 2332 } 2333 2334 // cancel previous scan 2335 removeScanRequest(); 2336 2337 // set new scanning schedule 2338 ScanSettings settings2 = new ScanSettings(); 2339 settings2.band = WifiScanner.WIFI_BAND_UNSPECIFIED; 2340 settings2.channels = new ChannelSpec[channels.size()]; 2341 int i = 0; 2342 for (Integer channel : channels) { 2343 settings2.channels[i++] = new ChannelSpec(channel); 2344 } 2345 2346 settings2.periodInMs = settings.periodInMs; 2347 addScanRequest(settings2); 2348 2349 // start tracking new APs 2350 trackSignificantWifiChange(settings); 2351 } 2352 2353 2354 @Override 2355 public void onChangesFound(ScanResult results[]) { 2356 sendMessage(CMD_WIFI_CHANGE_DETECTED, 0, 0, results); 2357 } 2358 2359 private void addScanRequest(ScanSettings settings) { 2360 if (DBG) localLog("Starting scans"); 2361 if (mInternalClientInfo != null) { 2362 mInternalClientInfo.sendRequestToClientHandler( 2363 WifiScanner.CMD_START_BACKGROUND_SCAN, settings, null); 2364 } 2365 } 2366 2367 private void removeScanRequest() { 2368 if (DBG) localLog("Stopping scans"); 2369 if (mInternalClientInfo != null) { 2370 mInternalClientInfo.sendRequestToClientHandler( 2371 WifiScanner.CMD_STOP_BACKGROUND_SCAN); 2372 } 2373 } 2374 2375 private void trackSignificantWifiChange(WifiScanner.WifiChangeSettings settings) { 2376 if (mScannerImpl != null) { 2377 mScannerImpl.untrackSignificantWifiChange(); 2378 mScannerImpl.trackSignificantWifiChange(settings, this); 2379 } 2380 } 2381 2382 private void untrackSignificantWifiChange() { 2383 if (mScannerImpl != null) { 2384 mScannerImpl.untrackSignificantWifiChange(); 2385 } 2386 } 2387 2388 private void addWifiChangeHandler(ClientInfo ci, int handler) { 2389 mActiveWifiChangeHandlers.add(Pair.create(ci, handler)); 2390 // Add an internal client to make background scan requests. 2391 if (mInternalClientInfo == null) { 2392 mInternalClientInfo = 2393 new InternalClientInfo(ci.getUid(), new Messenger(this.getHandler())); 2394 mInternalClientInfo.register(); 2395 } 2396 } 2397 2398 private void removeWifiChangeHandler(ClientInfo ci, int handler) { 2399 mActiveWifiChangeHandlers.remove(Pair.create(ci, handler)); 2400 untrackSignificantWifiChangeOnEmpty(); 2401 } 2402 2403 private void untrackSignificantWifiChangeOnEmpty() { 2404 if (mActiveWifiChangeHandlers.isEmpty()) { 2405 if (DBG) localLog("Got Disable Wifi Change"); 2406 mCurrentBssids = null; 2407 untrackSignificantWifiChange(); 2408 // Remove the internal client when there are no more external clients. 2409 if (mInternalClientInfo != null) { 2410 mInternalClientInfo.cleanup(); 2411 mInternalClientInfo = null; 2412 } 2413 transitionTo(mDefaultState); 2414 } 2415 } 2416 2417 private void reportWifiChanged(ScanResult[] results) { 2418 WifiScanner.ParcelableScanResults parcelableScanResults = 2419 new WifiScanner.ParcelableScanResults(results); 2420 Iterator<Pair<ClientInfo, Integer>> it = mActiveWifiChangeHandlers.iterator(); 2421 while (it.hasNext()) { 2422 Pair<ClientInfo, Integer> entry = it.next(); 2423 ClientInfo ci = entry.first; 2424 int handler = entry.second; 2425 ci.reportEvent(WifiScanner.CMD_WIFI_CHANGE_DETECTED, 0, handler, 2426 parcelableScanResults); 2427 } 2428 } 2429 2430 private void reportWifiStabilized(ScanResult[] results) { 2431 WifiScanner.ParcelableScanResults parcelableScanResults = 2432 new WifiScanner.ParcelableScanResults(results); 2433 Iterator<Pair<ClientInfo, Integer>> it = mActiveWifiChangeHandlers.iterator(); 2434 while (it.hasNext()) { 2435 Pair<ClientInfo, Integer> entry = it.next(); 2436 ClientInfo ci = entry.first; 2437 int handler = entry.second; 2438 ci.reportEvent(WifiScanner.CMD_WIFI_CHANGES_STABILIZED, 0, handler, 2439 parcelableScanResults); 2440 } 2441 } 2442 } 2443 2444 private static String toString(int uid, ScanSettings settings) { 2445 StringBuilder sb = new StringBuilder(); 2446 sb.append("ScanSettings[uid=").append(uid); 2447 sb.append(", period=").append(settings.periodInMs); 2448 sb.append(", report=").append(settings.reportEvents); 2449 if (settings.reportEvents == WifiScanner.REPORT_EVENT_AFTER_BUFFER_FULL 2450 && settings.numBssidsPerScan > 0 2451 && settings.maxScansToCache > 1) { 2452 sb.append(", batch=").append(settings.maxScansToCache); 2453 sb.append(", numAP=").append(settings.numBssidsPerScan); 2454 } 2455 sb.append(", ").append(ChannelHelper.toString(settings)); 2456 sb.append("]"); 2457 2458 return sb.toString(); 2459 } 2460 2461 @Override 2462 protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 2463 if (mContext.checkCallingOrSelfPermission(android.Manifest.permission.DUMP) 2464 != PackageManager.PERMISSION_GRANTED) { 2465 pw.println("Permission Denial: can't dump WifiScanner from from pid=" 2466 + Binder.getCallingPid() 2467 + ", uid=" + Binder.getCallingUid() 2468 + " without permission " 2469 + android.Manifest.permission.DUMP); 2470 return; 2471 } 2472 pw.println("WifiScanningService - Log Begin ----"); 2473 mLocalLog.dump(fd, pw, args); 2474 pw.println("WifiScanningService - Log End ----"); 2475 pw.println(); 2476 pw.println("clients:"); 2477 for (ClientInfo client : mClients.values()) { 2478 pw.println(" " + client); 2479 } 2480 pw.println("listeners:"); 2481 for (ClientInfo client : mClients.values()) { 2482 Collection<ScanSettings> settingsList = 2483 mBackgroundScanStateMachine.getBackgroundScanSettings(client); 2484 for (ScanSettings settings : settingsList) { 2485 pw.println(" " + toString(client.mUid, settings)); 2486 } 2487 } 2488 if (mBackgroundScheduler != null) { 2489 WifiNative.ScanSettings schedule = mBackgroundScheduler.getSchedule(); 2490 if (schedule != null) { 2491 pw.println("schedule:"); 2492 pw.println(" base period: " + schedule.base_period_ms); 2493 pw.println(" max ap per scan: " + schedule.max_ap_per_scan); 2494 pw.println(" batched scans: " + schedule.report_threshold_num_scans); 2495 pw.println(" buckets:"); 2496 for (int b = 0; b < schedule.num_buckets; b++) { 2497 WifiNative.BucketSettings bucket = schedule.buckets[b]; 2498 pw.println(" bucket " + bucket.bucket + " (" + bucket.period_ms + "ms)[" 2499 + bucket.report_events + "]: " 2500 + ChannelHelper.toString(bucket)); 2501 } 2502 } 2503 } 2504 if (mPnoScanStateMachine != null) { 2505 mPnoScanStateMachine.dump(fd, pw, args); 2506 } 2507 } 2508 2509 void logScanRequest(String request, ClientInfo ci, int id, WorkSource workSource, 2510 ScanSettings settings, PnoSettings pnoSettings) { 2511 StringBuilder sb = new StringBuilder(); 2512 sb.append(request) 2513 .append(": ") 2514 .append(ci.toString()) 2515 .append(",Id=") 2516 .append(id); 2517 if (workSource != null) { 2518 sb.append(",").append(workSource); 2519 } 2520 if (settings != null) { 2521 sb.append(", "); 2522 describeTo(sb, settings); 2523 } 2524 if (pnoSettings != null) { 2525 sb.append(", "); 2526 describeTo(sb, pnoSettings); 2527 } 2528 localLog(sb.toString()); 2529 } 2530 2531 void logCallback(String callback, ClientInfo ci, int id, String extra) { 2532 StringBuilder sb = new StringBuilder(); 2533 sb.append(callback) 2534 .append(": ") 2535 .append(ci.toString()) 2536 .append(",Id=") 2537 .append(id); 2538 if (extra != null) { 2539 sb.append(",").append(extra); 2540 } 2541 localLog(sb.toString()); 2542 } 2543 2544 static String describeForLog(ScanData[] results) { 2545 StringBuilder sb = new StringBuilder(); 2546 sb.append("results="); 2547 for (int i = 0; i < results.length; ++i) { 2548 if (i > 0) sb.append(";"); 2549 sb.append(results[i].getResults().length); 2550 } 2551 return sb.toString(); 2552 } 2553 2554 static String describeForLog(ScanResult[] results) { 2555 return "results=" + results.length; 2556 } 2557 2558 static String describeTo(StringBuilder sb, ScanSettings scanSettings) { 2559 sb.append("ScanSettings { ") 2560 .append(" band:").append(scanSettings.band) 2561 .append(" period:").append(scanSettings.periodInMs) 2562 .append(" reportEvents:").append(scanSettings.reportEvents) 2563 .append(" numBssidsPerScan:").append(scanSettings.numBssidsPerScan) 2564 .append(" maxScansToCache:").append(scanSettings.maxScansToCache) 2565 .append(" channels:[ "); 2566 if (scanSettings.channels != null) { 2567 for (int i = 0; i < scanSettings.channels.length; i++) { 2568 sb.append(scanSettings.channels[i].frequency) 2569 .append(" "); 2570 } 2571 } 2572 sb.append(" ] ") 2573 .append(" } "); 2574 return sb.toString(); 2575 } 2576 2577 static String describeTo(StringBuilder sb, PnoSettings pnoSettings) { 2578 sb.append("PnoSettings { ") 2579 .append(" min5GhzRssi:").append(pnoSettings.min5GHzRssi) 2580 .append(" min24GhzRssi:").append(pnoSettings.min24GHzRssi) 2581 .append(" initialScoreMax:").append(pnoSettings.initialScoreMax) 2582 .append(" currentConnectionBonus:").append(pnoSettings.currentConnectionBonus) 2583 .append(" sameNetworkBonus:").append(pnoSettings.sameNetworkBonus) 2584 .append(" secureBonus:").append(pnoSettings.secureBonus) 2585 .append(" band5GhzBonus:").append(pnoSettings.band5GHzBonus) 2586 .append(" isConnected:").append(pnoSettings.isConnected) 2587 .append(" networks:[ "); 2588 if (pnoSettings.networkList != null) { 2589 for (int i = 0; i < pnoSettings.networkList.length; i++) { 2590 sb.append(pnoSettings.networkList[i].ssid) 2591 .append(",") 2592 .append(pnoSettings.networkList[i].networkId) 2593 .append(" "); 2594 } 2595 } 2596 sb.append(" ] ") 2597 .append(" } "); 2598 return sb.toString(); 2599 } 2600} 2601