NetworkMonitor.java revision 306f1a45c636e3721ae4b84b8797e6349ae6ff57
1/* 2 * Copyright (C) 2014 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.connectivity; 18 19import android.app.PendingIntent; 20import android.content.BroadcastReceiver; 21import android.content.ComponentName; 22import android.content.Context; 23import android.content.Intent; 24import android.content.IntentFilter; 25import android.net.ConnectivityManager; 26import android.net.Network; 27import android.net.NetworkCapabilities; 28import android.net.NetworkInfo; 29import android.net.wifi.WifiInfo; 30import android.net.wifi.WifiManager; 31import android.os.Handler; 32import android.os.Message; 33import android.os.SystemClock; 34import android.os.SystemProperties; 35import android.os.UserHandle; 36import android.provider.Settings; 37import android.telephony.CellIdentityCdma; 38import android.telephony.CellIdentityGsm; 39import android.telephony.CellIdentityLte; 40import android.telephony.CellIdentityWcdma; 41import android.telephony.CellInfo; 42import android.telephony.CellInfoCdma; 43import android.telephony.CellInfoGsm; 44import android.telephony.CellInfoLte; 45import android.telephony.CellInfoWcdma; 46import android.telephony.TelephonyManager; 47 48import com.android.internal.util.Protocol; 49import com.android.internal.util.State; 50import com.android.internal.util.StateMachine; 51import com.android.server.ConnectivityService; 52import com.android.server.connectivity.NetworkAgentInfo; 53 54import java.io.IOException; 55import java.net.HttpURLConnection; 56import java.net.URL; 57import java.util.List; 58 59/** 60 * {@hide} 61 */ 62public class NetworkMonitor extends StateMachine { 63 private static final boolean DBG = true; 64 private static final String TAG = "NetworkMonitor"; 65 private static final String DEFAULT_SERVER = "clients3.google.com"; 66 private static final int SOCKET_TIMEOUT_MS = 10000; 67 public static final String ACTION_NETWORK_CONDITIONS_MEASURED = 68 "android.net.conn.NETWORK_CONDITIONS_MEASURED"; 69 public static final String EXTRA_CONNECTIVITY_TYPE = "extra_connectivity_type"; 70 public static final String EXTRA_NETWORK_TYPE = "extra_network_type"; 71 public static final String EXTRA_RESPONSE_RECEIVED = "extra_response_received"; 72 public static final String EXTRA_IS_CAPTIVE_PORTAL = "extra_is_captive_portal"; 73 public static final String EXTRA_CELL_ID = "extra_cellid"; 74 public static final String EXTRA_SSID = "extra_ssid"; 75 public static final String EXTRA_BSSID = "extra_bssid"; 76 /** real time since boot */ 77 public static final String EXTRA_REQUEST_TIMESTAMP_MS = "extra_request_timestamp_ms"; 78 public static final String EXTRA_RESPONSE_TIMESTAMP_MS = "extra_response_timestamp_ms"; 79 80 private static final String PERMISSION_ACCESS_NETWORK_CONDITIONS = 81 "android.permission.ACCESS_NETWORK_CONDITIONS"; 82 83 // Intent broadcast when user selects sign-in notification. 84 private static final String ACTION_SIGN_IN_REQUESTED = 85 "android.net.netmon.sign_in_requested"; 86 87 // Keep these in sync with CaptivePortalLoginActivity.java. 88 // Intent broadcast from CaptivePortalLogin indicating sign-in is complete. 89 // Extras: 90 // EXTRA_TEXT = netId 91 // LOGGED_IN_RESULT = "1" if we should use network, "0" if not. 92 private static final String ACTION_CAPTIVE_PORTAL_LOGGED_IN = 93 "android.net.netmon.captive_portal_logged_in"; 94 private static final String LOGGED_IN_RESULT = "result"; 95 96 private static final int BASE = Protocol.BASE_NETWORK_MONITOR; 97 98 /** 99 * Inform NetworkMonitor that their network is connected. 100 * Initiates Network Validation. 101 */ 102 public static final int CMD_NETWORK_CONNECTED = BASE + 1; 103 104 /** 105 * Inform ConnectivityService that the network is validated. 106 * obj = NetworkAgentInfo 107 */ 108 public static final int EVENT_NETWORK_VALIDATED = BASE + 2; 109 110 /** 111 * Inform NetworkMonitor to linger a network. The Monitor should 112 * start a timer and/or start watching for zero live connections while 113 * moving towards LINGER_COMPLETE. After the Linger period expires 114 * (or other events mark the end of the linger state) the LINGER_COMPLETE 115 * event should be sent and the network will be shut down. If a 116 * CMD_NETWORK_CONNECTED happens before the LINGER completes 117 * it indicates further desire to keep the network alive and so 118 * the LINGER is aborted. 119 */ 120 public static final int CMD_NETWORK_LINGER = BASE + 3; 121 122 /** 123 * Message to self indicating linger delay has expired. 124 * arg1 = Token to ignore old messages. 125 */ 126 private static final int CMD_LINGER_EXPIRED = BASE + 4; 127 128 /** 129 * Inform ConnectivityService that the network LINGER period has 130 * expired. 131 * obj = NetworkAgentInfo 132 */ 133 public static final int EVENT_NETWORK_LINGER_COMPLETE = BASE + 5; 134 135 /** 136 * Message to self indicating it's time to evaluate a network's connectivity. 137 * arg1 = Token to ignore old messages. 138 */ 139 private static final int CMD_REEVALUATE = BASE + 6; 140 141 /** 142 * Message to self indicating network evaluation is complete. 143 * arg1 = Token to ignore old messages. 144 * arg2 = HTTP response code of network evaluation. 145 */ 146 private static final int EVENT_REEVALUATION_COMPLETE = BASE + 7; 147 148 /** 149 * Inform NetworkMonitor that the network has disconnected. 150 */ 151 public static final int CMD_NETWORK_DISCONNECTED = BASE + 8; 152 153 /** 154 * Force evaluation even if it has succeeded in the past. 155 */ 156 public static final int CMD_FORCE_REEVALUATION = BASE + 9; 157 158 /** 159 * Message to self indicating captive portal login is complete. 160 * arg1 = Token to ignore old messages. 161 * arg2 = 1 if we should use this network, 0 otherwise. 162 */ 163 private static final int CMD_CAPTIVE_PORTAL_LOGGED_IN = BASE + 10; 164 165 /** 166 * Message to self indicating user desires to log into captive portal. 167 * arg1 = Token to ignore old messages. 168 */ 169 private static final int CMD_USER_WANTS_SIGN_IN = BASE + 11; 170 171 /** 172 * Request ConnectivityService display provisioning notification. 173 * arg1 = Whether to make the notification visible. 174 * arg2 = NetID. 175 * obj = Intent to be launched when notification selected by user, null if !arg1. 176 */ 177 public static final int EVENT_PROVISIONING_NOTIFICATION = BASE + 12; 178 179 /** 180 * Message to self indicating sign-in app bypassed captive portal. 181 */ 182 private static final int EVENT_APP_BYPASSED_CAPTIVE_PORTAL = BASE + 13; 183 184 /** 185 * Message to self indicating no sign-in app responded. 186 */ 187 private static final int EVENT_NO_APP_RESPONSE = BASE + 14; 188 189 /** 190 * Message to self indicating sign-in app indicates sign-in is not possible. 191 */ 192 private static final int EVENT_APP_INDICATES_SIGN_IN_IMPOSSIBLE = BASE + 15; 193 194 private static final String LINGER_DELAY_PROPERTY = "persist.netmon.linger"; 195 // Default to 30s linger time-out. 196 private static final int DEFAULT_LINGER_DELAY_MS = 30000; 197 private final int mLingerDelayMs; 198 private int mLingerToken = 0; 199 200 // Negative values disable reevaluation. 201 private static final String REEVALUATE_DELAY_PROPERTY = "persist.netmon.reeval_delay"; 202 // Default to 5s reevaluation delay. 203 private static final int DEFAULT_REEVALUATE_DELAY_MS = 5000; 204 private static final int MAX_RETRIES = 10; 205 private final int mReevaluateDelayMs; 206 private int mReevaluateToken = 0; 207 208 private int mCaptivePortalLoggedInToken = 0; 209 private int mUserPromptedToken = 0; 210 211 private final Context mContext; 212 private final Handler mConnectivityServiceHandler; 213 private final NetworkAgentInfo mNetworkAgentInfo; 214 private final TelephonyManager mTelephonyManager; 215 private final WifiManager mWifiManager; 216 217 private String mServer; 218 private boolean mIsCaptivePortalCheckEnabled = false; 219 220 private State mDefaultState = new DefaultState(); 221 private State mOfflineState = new OfflineState(); 222 private State mValidatedState = new ValidatedState(); 223 private State mEvaluatingState = new EvaluatingState(); 224 private State mUninteractiveAppsPromptedState = new UninteractiveAppsPromptedState(); 225 private State mUserPromptedState = new UserPromptedState(); 226 private State mInteractiveAppsPromptedState = new InteractiveAppsPromptedState(); 227 private State mCaptivePortalState = new CaptivePortalState(); 228 private State mLingeringState = new LingeringState(); 229 230 public NetworkMonitor(Context context, Handler handler, NetworkAgentInfo networkAgentInfo) { 231 // Add suffix indicating which NetworkMonitor we're talking about. 232 super(TAG + networkAgentInfo.name()); 233 234 mContext = context; 235 mConnectivityServiceHandler = handler; 236 mNetworkAgentInfo = networkAgentInfo; 237 mTelephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE); 238 mWifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE); 239 240 addState(mDefaultState); 241 addState(mOfflineState, mDefaultState); 242 addState(mValidatedState, mDefaultState); 243 addState(mEvaluatingState, mDefaultState); 244 addState(mUninteractiveAppsPromptedState, mDefaultState); 245 addState(mUserPromptedState, mDefaultState); 246 addState(mInteractiveAppsPromptedState, mDefaultState); 247 addState(mCaptivePortalState, mDefaultState); 248 addState(mLingeringState, mDefaultState); 249 setInitialState(mOfflineState); 250 251 mServer = Settings.Global.getString(mContext.getContentResolver(), 252 Settings.Global.CAPTIVE_PORTAL_SERVER); 253 if (mServer == null) mServer = DEFAULT_SERVER; 254 255 mLingerDelayMs = SystemProperties.getInt(LINGER_DELAY_PROPERTY, DEFAULT_LINGER_DELAY_MS); 256 mReevaluateDelayMs = SystemProperties.getInt(REEVALUATE_DELAY_PROPERTY, 257 DEFAULT_REEVALUATE_DELAY_MS); 258 259 mIsCaptivePortalCheckEnabled = Settings.Global.getInt(mContext.getContentResolver(), 260 Settings.Global.CAPTIVE_PORTAL_DETECTION_ENABLED, 1) == 1; 261 262 start(); 263 } 264 265 private class DefaultState extends State { 266 @Override 267 public boolean processMessage(Message message) { 268 if (DBG) log(getName() + message.toString()); 269 switch (message.what) { 270 case CMD_NETWORK_LINGER: 271 if (DBG) log("Lingering"); 272 transitionTo(mLingeringState); 273 break; 274 case CMD_NETWORK_CONNECTED: 275 if (DBG) log("Connected"); 276 transitionTo(mEvaluatingState); 277 break; 278 case CMD_NETWORK_DISCONNECTED: 279 if (DBG) log("Disconnected - quitting"); 280 quit(); 281 break; 282 case CMD_FORCE_REEVALUATION: 283 if (DBG) log("Forcing reevaluation"); 284 transitionTo(mEvaluatingState); 285 break; 286 default: 287 break; 288 } 289 return HANDLED; 290 } 291 } 292 293 private class OfflineState extends State { 294 @Override 295 public boolean processMessage(Message message) { 296 if (DBG) log(getName() + message.toString()); 297 return NOT_HANDLED; 298 } 299 } 300 301 private class ValidatedState extends State { 302 @Override 303 public void enter() { 304 if (DBG) log("Validated"); 305 mConnectivityServiceHandler.sendMessage( 306 obtainMessage(EVENT_NETWORK_VALIDATED, mNetworkAgentInfo)); 307 } 308 309 @Override 310 public boolean processMessage(Message message) { 311 if (DBG) log(getName() + message.toString()); 312 switch (message.what) { 313 case CMD_NETWORK_CONNECTED: 314 transitionTo(mValidatedState); 315 break; 316 default: 317 return NOT_HANDLED; 318 } 319 return HANDLED; 320 } 321 } 322 323 private class EvaluatingState extends State { 324 private int mRetries; 325 326 private class EvaluateInternetConnectivity extends Thread { 327 private int mToken; 328 EvaluateInternetConnectivity(int token) { 329 mToken = token; 330 } 331 public void run() { 332 sendMessage(EVENT_REEVALUATION_COMPLETE, mToken, isCaptivePortal()); 333 } 334 } 335 336 @Override 337 public void enter() { 338 mRetries = 0; 339 sendMessage(CMD_REEVALUATE, ++mReevaluateToken, 0); 340 } 341 342 @Override 343 public boolean processMessage(Message message) { 344 if (DBG) log(getName() + message.toString()); 345 switch (message.what) { 346 case CMD_REEVALUATE: 347 if (message.arg1 != mReevaluateToken) 348 break; 349 if (mNetworkAgentInfo.isVPN()) { 350 transitionTo(mValidatedState); 351 } 352 // If network provides no internet connectivity adjust evaluation. 353 if (!mNetworkAgentInfo.networkCapabilities.hasCapability( 354 NetworkCapabilities.NET_CAPABILITY_INTERNET)) { 355 // TODO: Try to verify something works. Do all gateways respond to pings? 356 transitionTo(mValidatedState); 357 } 358 // Kick off a thread to perform internet connectivity evaluation. 359 Thread thread = new EvaluateInternetConnectivity(mReevaluateToken); 360 thread.run(); 361 break; 362 case EVENT_REEVALUATION_COMPLETE: 363 if (message.arg1 != mReevaluateToken) 364 break; 365 int httpResponseCode = message.arg2; 366 if (httpResponseCode == 204) { 367 transitionTo(mValidatedState); 368 } else if (httpResponseCode >= 200 && httpResponseCode <= 399) { 369 transitionTo(mUninteractiveAppsPromptedState); 370 } else if (++mRetries > MAX_RETRIES) { 371 transitionTo(mOfflineState); 372 } else if (mReevaluateDelayMs >= 0) { 373 Message msg = obtainMessage(CMD_REEVALUATE, ++mReevaluateToken, 0); 374 sendMessageDelayed(msg, mReevaluateDelayMs); 375 } 376 break; 377 default: 378 return NOT_HANDLED; 379 } 380 return HANDLED; 381 } 382 } 383 384 private class AppRespondedBroadcastReceiver extends BroadcastReceiver { 385 private static final int CAPTIVE_PORTAL_UNINITIALIZED_RETURN_CODE = 0; 386 private boolean mCanceled; 387 AppRespondedBroadcastReceiver() { 388 mCanceled = false; 389 } 390 public void send(String action) { 391 Intent intent = new Intent(action); 392 intent.putExtra(ConnectivityManager.EXTRA_NETWORK, mNetworkAgentInfo.network); 393 mContext.sendOrderedBroadcastAsUser(intent, UserHandle.ALL, null, this, getHandler(), 394 CAPTIVE_PORTAL_UNINITIALIZED_RETURN_CODE, null, null); 395 } 396 public void cancel() { 397 mCanceled = true; 398 } 399 @Override 400 public void onReceive(Context context, Intent intent) { 401 if (!mCanceled) { 402 cancel(); 403 switch (getResultCode()) { 404 case ConnectivityManager.CAPTIVE_PORTAL_SIGNED_IN: 405 sendMessage(EVENT_APP_BYPASSED_CAPTIVE_PORTAL); 406 break; 407 case ConnectivityManager.CAPTIVE_PORTAL_DISCONNECT: 408 sendMessage(EVENT_APP_INDICATES_SIGN_IN_IMPOSSIBLE); 409 break; 410 // NOTE: This case label makes compiler enforce no overlap between result codes. 411 case CAPTIVE_PORTAL_UNINITIALIZED_RETURN_CODE: 412 default: 413 sendMessage(EVENT_NO_APP_RESPONSE); 414 break; 415 } 416 } 417 } 418 } 419 420 private class UninteractiveAppsPromptedState extends State { 421 private AppRespondedBroadcastReceiver mReceiver; 422 @Override 423 public void enter() { 424 mReceiver = new AppRespondedBroadcastReceiver(); 425 mReceiver.send(ConnectivityManager.ACTION_CAPTIVE_PORTAL_DETECTED); 426 } 427 @Override 428 public boolean processMessage(Message message) { 429 if (DBG) log(getName() + message.toString()); 430 switch (message.what) { 431 case EVENT_APP_BYPASSED_CAPTIVE_PORTAL: 432 transitionTo(mValidatedState); 433 break; 434 case EVENT_APP_INDICATES_SIGN_IN_IMPOSSIBLE: 435 transitionTo(mOfflineState); 436 break; 437 case EVENT_NO_APP_RESPONSE: 438 transitionTo(mUserPromptedState); 439 break; 440 default: 441 return NOT_HANDLED; 442 } 443 return HANDLED; 444 } 445 public void exit() { 446 mReceiver.cancel(); 447 } 448 } 449 450 private class UserPromptedState extends State { 451 private class UserRespondedBroadcastReceiver extends BroadcastReceiver { 452 private final int mToken; 453 UserRespondedBroadcastReceiver(int token) { 454 mToken = token; 455 } 456 @Override 457 public void onReceive(Context context, Intent intent) { 458 if (Integer.parseInt(intent.getStringExtra(Intent.EXTRA_TEXT)) == 459 mNetworkAgentInfo.network.netId) { 460 sendMessage(obtainMessage(CMD_USER_WANTS_SIGN_IN, mToken)); 461 } 462 } 463 } 464 465 private UserRespondedBroadcastReceiver mUserRespondedBroadcastReceiver; 466 467 @Override 468 public void enter() { 469 // Wait for user to select sign-in notifcation. 470 mUserRespondedBroadcastReceiver = new UserRespondedBroadcastReceiver( 471 ++mUserPromptedToken); 472 IntentFilter filter = new IntentFilter(ACTION_SIGN_IN_REQUESTED); 473 mContext.registerReceiver(mUserRespondedBroadcastReceiver, filter); 474 // Initiate notification to sign-in. 475 Intent intent = new Intent(ACTION_SIGN_IN_REQUESTED); 476 intent.putExtra(Intent.EXTRA_TEXT, String.valueOf(mNetworkAgentInfo.network.netId)); 477 Message message = obtainMessage(EVENT_PROVISIONING_NOTIFICATION, 1, 478 mNetworkAgentInfo.network.netId, 479 PendingIntent.getBroadcast(mContext, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT)); 480 mConnectivityServiceHandler.sendMessage(message); 481 } 482 483 @Override 484 public boolean processMessage(Message message) { 485 if (DBG) log(getName() + message.toString()); 486 switch (message.what) { 487 case CMD_USER_WANTS_SIGN_IN: 488 if (message.arg1 != mUserPromptedToken) 489 break; 490 transitionTo(mInteractiveAppsPromptedState); 491 break; 492 default: 493 return NOT_HANDLED; 494 } 495 return HANDLED; 496 } 497 498 @Override 499 public void exit() { 500 Message message = obtainMessage(EVENT_PROVISIONING_NOTIFICATION, 0, 501 mNetworkAgentInfo.network.netId, null); 502 mConnectivityServiceHandler.sendMessage(message); 503 mContext.unregisterReceiver(mUserRespondedBroadcastReceiver); 504 mUserRespondedBroadcastReceiver = null; 505 } 506 } 507 508 private class InteractiveAppsPromptedState extends State { 509 private AppRespondedBroadcastReceiver mReceiver; 510 @Override 511 public void enter() { 512 mReceiver = new AppRespondedBroadcastReceiver(); 513 mReceiver.send(ConnectivityManager.ACTION_CAPTIVE_PORTAL_SIGN_IN); 514 } 515 @Override 516 public boolean processMessage(Message message) { 517 if (DBG) log(getName() + message.toString()); 518 switch (message.what) { 519 case EVENT_APP_BYPASSED_CAPTIVE_PORTAL: 520 transitionTo(mValidatedState); 521 break; 522 case EVENT_APP_INDICATES_SIGN_IN_IMPOSSIBLE: 523 transitionTo(mOfflineState); 524 break; 525 case EVENT_NO_APP_RESPONSE: 526 transitionTo(mCaptivePortalState); 527 break; 528 default: 529 return NOT_HANDLED; 530 } 531 return HANDLED; 532 } 533 public void exit() { 534 mReceiver.cancel(); 535 } 536 } 537 538 private class CaptivePortalState extends State { 539 private class CaptivePortalLoggedInBroadcastReceiver extends BroadcastReceiver { 540 private final int mToken; 541 542 CaptivePortalLoggedInBroadcastReceiver(int token) { 543 mToken = token; 544 } 545 546 @Override 547 public void onReceive(Context context, Intent intent) { 548 if (Integer.parseInt(intent.getStringExtra(Intent.EXTRA_TEXT)) == 549 mNetworkAgentInfo.network.netId) { 550 sendMessage(obtainMessage(CMD_CAPTIVE_PORTAL_LOGGED_IN, mToken, 551 Integer.parseInt(intent.getStringExtra(LOGGED_IN_RESULT)))); 552 } 553 } 554 } 555 556 private CaptivePortalLoggedInBroadcastReceiver mCaptivePortalLoggedInBroadcastReceiver; 557 558 @Override 559 public void enter() { 560 Intent intent = new Intent(Intent.ACTION_SEND); 561 intent.putExtra(Intent.EXTRA_TEXT, String.valueOf(mNetworkAgentInfo.network.netId)); 562 intent.setType("text/plain"); 563 intent.setComponent(new ComponentName("com.android.captiveportallogin", 564 "com.android.captiveportallogin.CaptivePortalLoginActivity")); 565 intent.setFlags(Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT | Intent.FLAG_ACTIVITY_NEW_TASK); 566 567 // Wait for result. 568 mCaptivePortalLoggedInBroadcastReceiver = new CaptivePortalLoggedInBroadcastReceiver( 569 ++mCaptivePortalLoggedInToken); 570 IntentFilter filter = new IntentFilter(ACTION_CAPTIVE_PORTAL_LOGGED_IN); 571 mContext.registerReceiver(mCaptivePortalLoggedInBroadcastReceiver, filter); 572 // Initiate app to log in. 573 mContext.startActivityAsUser(intent, UserHandle.CURRENT); 574 } 575 576 @Override 577 public boolean processMessage(Message message) { 578 if (DBG) log(getName() + message.toString()); 579 switch (message.what) { 580 case CMD_CAPTIVE_PORTAL_LOGGED_IN: 581 if (message.arg1 != mCaptivePortalLoggedInToken) 582 break; 583 if (message.arg2 == 0) { 584 // TODO: Should teardown network. 585 transitionTo(mOfflineState); 586 } else { 587 transitionTo(mValidatedState); 588 } 589 break; 590 default: 591 return NOT_HANDLED; 592 } 593 return HANDLED; 594 } 595 596 @Override 597 public void exit() { 598 mContext.unregisterReceiver(mCaptivePortalLoggedInBroadcastReceiver); 599 mCaptivePortalLoggedInBroadcastReceiver = null; 600 } 601 } 602 603 private class LingeringState extends State { 604 @Override 605 public void enter() { 606 Message message = obtainMessage(CMD_LINGER_EXPIRED, ++mLingerToken, 0); 607 sendMessageDelayed(message, mLingerDelayMs); 608 } 609 610 @Override 611 public boolean processMessage(Message message) { 612 if (DBG) log(getName() + message.toString()); 613 switch (message.what) { 614 case CMD_NETWORK_CONNECTED: 615 // Go straight to active as we've already evaluated. 616 transitionTo(mValidatedState); 617 break; 618 case CMD_LINGER_EXPIRED: 619 if (message.arg1 != mLingerToken) 620 break; 621 mConnectivityServiceHandler.sendMessage( 622 obtainMessage(EVENT_NETWORK_LINGER_COMPLETE, mNetworkAgentInfo)); 623 break; 624 default: 625 return NOT_HANDLED; 626 } 627 return HANDLED; 628 } 629 } 630 631 /** 632 * Do a URL fetch on a known server to see if we get the data we expect. 633 * Returns HTTP response code. 634 */ 635 private int isCaptivePortal() { 636 if (!mIsCaptivePortalCheckEnabled) return 204; 637 638 HttpURLConnection urlConnection = null; 639 int httpResponseCode = 599; 640 try { 641 URL url = new URL("http", mServer, "/generate_204"); 642 if (DBG) { 643 log("Checking " + url.toString() + " on " + 644 mNetworkAgentInfo.networkInfo.getExtraInfo()); 645 } 646 url = mNetworkAgentInfo.network.getBoundURL(url); 647 urlConnection = (HttpURLConnection) url.openConnection(); 648 urlConnection.setInstanceFollowRedirects(false); 649 urlConnection.setConnectTimeout(SOCKET_TIMEOUT_MS); 650 urlConnection.setReadTimeout(SOCKET_TIMEOUT_MS); 651 urlConnection.setUseCaches(false); 652 653 // Time how long it takes to get a response to our request 654 long requestTimestamp = SystemClock.elapsedRealtime(); 655 656 urlConnection.getInputStream(); 657 658 // Time how long it takes to get a response to our request 659 long responseTimestamp = SystemClock.elapsedRealtime(); 660 661 httpResponseCode = urlConnection.getResponseCode(); 662 if (DBG) { 663 log("isCaptivePortal: ret=" + httpResponseCode + 664 " headers=" + urlConnection.getHeaderFields()); 665 } 666 // NOTE: We may want to consider an "HTTP/1.0 204" response to be a captive 667 // portal. The only example of this seen so far was a captive portal. For 668 // the time being go with prior behavior of assuming it's not a captive 669 // portal. If it is considered a captive portal, a different sign-in URL 670 // is needed (i.e. can't browse a 204). This could be the result of an HTTP 671 // proxy server. 672 673 // Consider 200 response with "Content-length=0" to not be a captive portal. 674 // There's no point in considering this a captive portal as the user cannot 675 // sign-in to an empty page. Probably the result of a broken transparent proxy. 676 // See http://b/9972012. 677 if (httpResponseCode == 200 && urlConnection.getContentLength() == 0) { 678 if (DBG) log("Empty 200 response interpreted as 204 response."); 679 httpResponseCode = 204; 680 } 681 682 sendNetworkConditionsBroadcast(true /* response received */, httpResponseCode == 204, 683 requestTimestamp, responseTimestamp); 684 } catch (IOException e) { 685 if (DBG) log("Probably not a portal: exception " + e); 686 if (httpResponseCode == 599) { 687 // TODO: Ping gateway and DNS server and log results. 688 } 689 } finally { 690 if (urlConnection != null) { 691 urlConnection.disconnect(); 692 } 693 } 694 return httpResponseCode; 695 } 696 697 /** 698 * @param responseReceived - whether or not we received a valid HTTP response to our request. 699 * If false, isCaptivePortal and responseTimestampMs are ignored 700 * TODO: This should be moved to the transports. The latency could be passed to the transports 701 * along with the captive portal result. Currently the TYPE_MOBILE broadcasts appear unused so 702 * perhaps this could just be added to the WiFi transport only. 703 */ 704 private void sendNetworkConditionsBroadcast(boolean responseReceived, boolean isCaptivePortal, 705 long requestTimestampMs, long responseTimestampMs) { 706 if (Settings.Global.getInt(mContext.getContentResolver(), 707 Settings.Global.WIFI_SCAN_ALWAYS_AVAILABLE, 0) == 0) { 708 if (DBG) log("Don't send network conditions - lacking user consent."); 709 return; 710 } 711 712 Intent latencyBroadcast = new Intent(ACTION_NETWORK_CONDITIONS_MEASURED); 713 switch (mNetworkAgentInfo.networkInfo.getType()) { 714 case ConnectivityManager.TYPE_WIFI: 715 WifiInfo currentWifiInfo = mWifiManager.getConnectionInfo(); 716 if (currentWifiInfo != null) { 717 // NOTE: getSSID()'s behavior changed in API 17; before that, SSIDs were not 718 // surrounded by double quotation marks (thus violating the Javadoc), but this 719 // was changed to match the Javadoc in API 17. Since clients may have started 720 // sanitizing the output of this method since API 17 was released, we should 721 // not change it here as it would become impossible to tell whether the SSID is 722 // simply being surrounded by quotes due to the API, or whether those quotes 723 // are actually part of the SSID. 724 latencyBroadcast.putExtra(EXTRA_SSID, currentWifiInfo.getSSID()); 725 latencyBroadcast.putExtra(EXTRA_BSSID, currentWifiInfo.getBSSID()); 726 } else { 727 if (DBG) logw("network info is TYPE_WIFI but no ConnectionInfo found"); 728 return; 729 } 730 break; 731 case ConnectivityManager.TYPE_MOBILE: 732 latencyBroadcast.putExtra(EXTRA_NETWORK_TYPE, mTelephonyManager.getNetworkType()); 733 List<CellInfo> info = mTelephonyManager.getAllCellInfo(); 734 if (info == null) return; 735 int numRegisteredCellInfo = 0; 736 for (CellInfo cellInfo : info) { 737 if (cellInfo.isRegistered()) { 738 numRegisteredCellInfo++; 739 if (numRegisteredCellInfo > 1) { 740 if (DBG) log("more than one registered CellInfo. Can't " + 741 "tell which is active. Bailing."); 742 return; 743 } 744 if (cellInfo instanceof CellInfoCdma) { 745 CellIdentityCdma cellId = ((CellInfoCdma) cellInfo).getCellIdentity(); 746 latencyBroadcast.putExtra(EXTRA_CELL_ID, cellId); 747 } else if (cellInfo instanceof CellInfoGsm) { 748 CellIdentityGsm cellId = ((CellInfoGsm) cellInfo).getCellIdentity(); 749 latencyBroadcast.putExtra(EXTRA_CELL_ID, cellId); 750 } else if (cellInfo instanceof CellInfoLte) { 751 CellIdentityLte cellId = ((CellInfoLte) cellInfo).getCellIdentity(); 752 latencyBroadcast.putExtra(EXTRA_CELL_ID, cellId); 753 } else if (cellInfo instanceof CellInfoWcdma) { 754 CellIdentityWcdma cellId = ((CellInfoWcdma) cellInfo).getCellIdentity(); 755 latencyBroadcast.putExtra(EXTRA_CELL_ID, cellId); 756 } else { 757 if (DBG) logw("Registered cellinfo is unrecognized"); 758 return; 759 } 760 } 761 } 762 break; 763 default: 764 return; 765 } 766 latencyBroadcast.putExtra(EXTRA_CONNECTIVITY_TYPE, mNetworkAgentInfo.networkInfo.getType()); 767 latencyBroadcast.putExtra(EXTRA_RESPONSE_RECEIVED, responseReceived); 768 latencyBroadcast.putExtra(EXTRA_REQUEST_TIMESTAMP_MS, requestTimestampMs); 769 770 if (responseReceived) { 771 latencyBroadcast.putExtra(EXTRA_IS_CAPTIVE_PORTAL, isCaptivePortal); 772 latencyBroadcast.putExtra(EXTRA_RESPONSE_TIMESTAMP_MS, responseTimestampMs); 773 } 774 mContext.sendBroadcast(latencyBroadcast, PERMISSION_ACCESS_NETWORK_CONDITIONS); 775 } 776} 777