| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.server.connectivity; |
| |
| import android.app.AlarmManager; |
| import android.app.PendingIntent; |
| import android.content.BroadcastReceiver; |
| import android.content.ComponentName; |
| import android.content.Context; |
| import android.content.Intent; |
| import android.content.IntentFilter; |
| import android.net.ConnectivityManager; |
| import android.net.NetworkRequest; |
| import android.net.ProxyInfo; |
| import android.net.TrafficStats; |
| import android.net.Uri; |
| import android.net.wifi.WifiInfo; |
| import android.net.wifi.WifiManager; |
| import android.os.Handler; |
| import android.os.Message; |
| import android.os.Process; |
| import android.os.SystemClock; |
| import android.os.SystemProperties; |
| import android.os.UserHandle; |
| import android.provider.Settings; |
| import android.telephony.CellIdentityCdma; |
| import android.telephony.CellIdentityGsm; |
| import android.telephony.CellIdentityLte; |
| import android.telephony.CellIdentityWcdma; |
| import android.telephony.CellInfo; |
| import android.telephony.CellInfoCdma; |
| import android.telephony.CellInfoGsm; |
| import android.telephony.CellInfoLte; |
| import android.telephony.CellInfoWcdma; |
| import android.telephony.TelephonyManager; |
| import android.text.TextUtils; |
| import android.util.LocalLog; |
| import android.util.LocalLog.ReadOnlyLocalLog; |
| import android.util.Log; |
| |
| import com.android.internal.annotations.VisibleForTesting; |
| import com.android.internal.util.Protocol; |
| import com.android.internal.util.State; |
| import com.android.internal.util.StateMachine; |
| import com.android.server.connectivity.NetworkAgentInfo; |
| |
| import java.io.IOException; |
| import java.net.HttpURLConnection; |
| import java.net.InetAddress; |
| import java.net.URL; |
| import java.util.List; |
| import java.util.Random; |
| |
| /** |
| * {@hide} |
| */ |
| public class NetworkMonitor extends StateMachine { |
| private static final boolean DBG = true; |
| private static final String TAG = "NetworkMonitor"; |
| private static final String DEFAULT_SERVER = "connectivitycheck.android.com"; |
| private static final int SOCKET_TIMEOUT_MS = 10000; |
| public static final String ACTION_NETWORK_CONDITIONS_MEASURED = |
| "android.net.conn.NETWORK_CONDITIONS_MEASURED"; |
| public static final String EXTRA_CONNECTIVITY_TYPE = "extra_connectivity_type"; |
| public static final String EXTRA_NETWORK_TYPE = "extra_network_type"; |
| public static final String EXTRA_RESPONSE_RECEIVED = "extra_response_received"; |
| public static final String EXTRA_IS_CAPTIVE_PORTAL = "extra_is_captive_portal"; |
| public static final String EXTRA_CELL_ID = "extra_cellid"; |
| public static final String EXTRA_SSID = "extra_ssid"; |
| public static final String EXTRA_BSSID = "extra_bssid"; |
| /** real time since boot */ |
| public static final String EXTRA_REQUEST_TIMESTAMP_MS = "extra_request_timestamp_ms"; |
| public static final String EXTRA_RESPONSE_TIMESTAMP_MS = "extra_response_timestamp_ms"; |
| |
| private static final String PERMISSION_ACCESS_NETWORK_CONDITIONS = |
| "android.permission.ACCESS_NETWORK_CONDITIONS"; |
| |
| // After a network has been tested this result can be sent with EVENT_NETWORK_TESTED. |
| // The network should be used as a default internet connection. It was found to be: |
| // 1. a functioning network providing internet access, or |
| // 2. a captive portal and the user decided to use it as is. |
| public static final int NETWORK_TEST_RESULT_VALID = 0; |
| // After a network has been tested this result can be sent with EVENT_NETWORK_TESTED. |
| // The network should not be used as a default internet connection. It was found to be: |
| // 1. a captive portal and the user is prompted to sign-in, or |
| // 2. a captive portal and the user did not want to use it, or |
| // 3. a broken network (e.g. DNS failed, connect failed, HTTP request failed). |
| public static final int NETWORK_TEST_RESULT_INVALID = 1; |
| |
| private static final int BASE = Protocol.BASE_NETWORK_MONITOR; |
| |
| /** |
| * Inform NetworkMonitor that their network is connected. |
| * Initiates Network Validation. |
| */ |
| public static final int CMD_NETWORK_CONNECTED = BASE + 1; |
| |
| /** |
| * Inform ConnectivityService that the network has been tested. |
| * obj = NetworkAgentInfo |
| * arg1 = One of the NETWORK_TESTED_RESULT_* constants. |
| */ |
| public static final int EVENT_NETWORK_TESTED = BASE + 2; |
| |
| /** |
| * Inform NetworkMonitor to linger a network. The Monitor should |
| * start a timer and/or start watching for zero live connections while |
| * moving towards LINGER_COMPLETE. After the Linger period expires |
| * (or other events mark the end of the linger state) the LINGER_COMPLETE |
| * event should be sent and the network will be shut down. If a |
| * CMD_NETWORK_CONNECTED happens before the LINGER completes |
| * it indicates further desire to keep the network alive and so |
| * the LINGER is aborted. |
| */ |
| public static final int CMD_NETWORK_LINGER = BASE + 3; |
| |
| /** |
| * Message to self indicating linger delay has expired. |
| * arg1 = Token to ignore old messages. |
| */ |
| private static final int CMD_LINGER_EXPIRED = BASE + 4; |
| |
| /** |
| * Inform ConnectivityService that the network LINGER period has |
| * expired. |
| * obj = NetworkAgentInfo |
| */ |
| public static final int EVENT_NETWORK_LINGER_COMPLETE = BASE + 5; |
| |
| /** |
| * Message to self indicating it's time to evaluate a network's connectivity. |
| * arg1 = Token to ignore old messages. |
| */ |
| private static final int CMD_REEVALUATE = BASE + 6; |
| |
| /** |
| * Inform NetworkMonitor that the network has disconnected. |
| */ |
| public static final int CMD_NETWORK_DISCONNECTED = BASE + 7; |
| |
| /** |
| * Force evaluation even if it has succeeded in the past. |
| * arg1 = UID responsible for requesting this reeval. Will be billed for data. |
| */ |
| public static final int CMD_FORCE_REEVALUATION = BASE + 8; |
| |
| /** |
| * Message to self indicating captive portal app finished. |
| * arg1 = one of: CAPTIVE_PORTAL_APP_RETURN_DISMISSED, |
| * CAPTIVE_PORTAL_APP_RETURN_UNWANTED, |
| * CAPTIVE_PORTAL_APP_RETURN_WANTED_AS_IS |
| * obj = mCaptivePortalLoggedInResponseToken as String |
| */ |
| public static final int CMD_CAPTIVE_PORTAL_APP_FINISHED = BASE + 9; |
| |
| /** |
| * Request ConnectivityService display provisioning notification. |
| * arg1 = Whether to make the notification visible. |
| * arg2 = NetID. |
| * obj = Intent to be launched when notification selected by user, null if !arg1. |
| */ |
| public static final int EVENT_PROVISIONING_NOTIFICATION = BASE + 10; |
| |
| /** |
| * Message to self indicating sign-in app should be launched. |
| * Sent by mLaunchCaptivePortalAppBroadcastReceiver when the |
| * user touches the sign in notification. |
| */ |
| private static final int CMD_LAUNCH_CAPTIVE_PORTAL_APP = BASE + 11; |
| |
| /** |
| * Retest network to see if captive portal is still in place. |
| * arg1 = UID responsible for requesting this reeval. Will be billed for data. |
| * 0 indicates self-initiated, so nobody to blame. |
| */ |
| private static final int CMD_CAPTIVE_PORTAL_RECHECK = BASE + 12; |
| |
| private static final String LINGER_DELAY_PROPERTY = "persist.netmon.linger"; |
| // Default to 30s linger time-out. Modifyable only for testing. |
| private static int DEFAULT_LINGER_DELAY_MS = 30000; |
| private final int mLingerDelayMs; |
| private int mLingerToken = 0; |
| |
| // Start mReevaluateDelayMs at this value and double. |
| private static final int INITIAL_REEVALUATE_DELAY_MS = 1000; |
| private static final int MAX_REEVALUATE_DELAY_MS = 10*60*1000; |
| // Before network has been evaluated this many times, ignore repeated reevaluate requests. |
| private static final int IGNORE_REEVALUATE_ATTEMPTS = 5; |
| private int mReevaluateToken = 0; |
| private static final int INVALID_UID = -1; |
| private int mUidResponsibleForReeval = INVALID_UID; |
| // Stop blaming UID that requested re-evaluation after this many attempts. |
| private static final int BLAME_FOR_EVALUATION_ATTEMPTS = 5; |
| // Delay between reevaluations once a captive portal has been found. |
| private static final int CAPTIVE_PORTAL_REEVALUATE_DELAY_MS = 10*60*1000; |
| |
| private final Context mContext; |
| private final Handler mConnectivityServiceHandler; |
| private final NetworkAgentInfo mNetworkAgentInfo; |
| private final TelephonyManager mTelephonyManager; |
| private final WifiManager mWifiManager; |
| private final AlarmManager mAlarmManager; |
| private final NetworkRequest mDefaultRequest; |
| |
| private String mServer; |
| private boolean mIsCaptivePortalCheckEnabled = false; |
| |
| // Set if the user explicitly selected "Do not use this network" in captive portal sign-in app. |
| private boolean mUserDoesNotWant = false; |
| // Avoids surfacing "Sign in to network" notification. |
| private boolean mDontDisplaySigninNotification = false; |
| |
| public boolean systemReady = false; |
| |
| private final State mDefaultState = new DefaultState(); |
| private final State mValidatedState = new ValidatedState(); |
| private final State mMaybeNotifyState = new MaybeNotifyState(); |
| private final State mEvaluatingState = new EvaluatingState(); |
| private final State mCaptivePortalState = new CaptivePortalState(); |
| private final State mLingeringState = new LingeringState(); |
| |
| private CustomIntentReceiver mLaunchCaptivePortalAppBroadcastReceiver = null; |
| private String mCaptivePortalLoggedInResponseToken = null; |
| |
| private final LocalLog validationLogs = new LocalLog(20); // 20 lines |
| |
| public NetworkMonitor(Context context, Handler handler, NetworkAgentInfo networkAgentInfo, |
| NetworkRequest defaultRequest) { |
| // Add suffix indicating which NetworkMonitor we're talking about. |
| super(TAG + networkAgentInfo.name()); |
| |
| mContext = context; |
| mConnectivityServiceHandler = handler; |
| mNetworkAgentInfo = networkAgentInfo; |
| mTelephonyManager = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE); |
| mWifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE); |
| mAlarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE); |
| mDefaultRequest = defaultRequest; |
| |
| addState(mDefaultState); |
| addState(mValidatedState, mDefaultState); |
| addState(mMaybeNotifyState, mDefaultState); |
| addState(mEvaluatingState, mMaybeNotifyState); |
| addState(mCaptivePortalState, mMaybeNotifyState); |
| addState(mLingeringState, mDefaultState); |
| setInitialState(mDefaultState); |
| |
| mServer = Settings.Global.getString(mContext.getContentResolver(), |
| Settings.Global.CAPTIVE_PORTAL_SERVER); |
| if (mServer == null) mServer = DEFAULT_SERVER; |
| |
| mLingerDelayMs = SystemProperties.getInt(LINGER_DELAY_PROPERTY, DEFAULT_LINGER_DELAY_MS); |
| |
| mIsCaptivePortalCheckEnabled = Settings.Global.getInt(mContext.getContentResolver(), |
| Settings.Global.CAPTIVE_PORTAL_DETECTION_ENABLED, 1) == 1; |
| |
| mCaptivePortalLoggedInResponseToken = String.valueOf(new Random().nextLong()); |
| |
| start(); |
| } |
| |
| @Override |
| protected void log(String s) { |
| if (DBG) Log.d(TAG + "/" + mNetworkAgentInfo.name(), s); |
| } |
| |
| private void validationLog(String s) { |
| if (DBG) log(s); |
| validationLogs.log(s); |
| } |
| |
| public ReadOnlyLocalLog getValidationLogs() { |
| return validationLogs.readOnlyLocalLog(); |
| } |
| |
| // DefaultState is the parent of all States. It exists only to handle CMD_* messages but |
| // does not entail any real state (hence no enter() or exit() routines). |
| private class DefaultState extends State { |
| @Override |
| public boolean processMessage(Message message) { |
| switch (message.what) { |
| case CMD_NETWORK_LINGER: |
| log("Lingering"); |
| transitionTo(mLingeringState); |
| return HANDLED; |
| case CMD_NETWORK_CONNECTED: |
| transitionTo(mEvaluatingState); |
| return HANDLED; |
| case CMD_NETWORK_DISCONNECTED: |
| if (mLaunchCaptivePortalAppBroadcastReceiver != null) { |
| mContext.unregisterReceiver(mLaunchCaptivePortalAppBroadcastReceiver); |
| mLaunchCaptivePortalAppBroadcastReceiver = null; |
| } |
| quit(); |
| return HANDLED; |
| case CMD_FORCE_REEVALUATION: |
| case CMD_CAPTIVE_PORTAL_RECHECK: |
| log("Forcing reevaluation for UID " + message.arg1); |
| mUidResponsibleForReeval = message.arg1; |
| transitionTo(mEvaluatingState); |
| return HANDLED; |
| case CMD_CAPTIVE_PORTAL_APP_FINISHED: |
| if (!mCaptivePortalLoggedInResponseToken.equals((String)message.obj)) |
| return HANDLED; |
| log("CaptivePortal App responded with " + message.arg1); |
| // Previous token was sent out, come up with a new one. |
| mCaptivePortalLoggedInResponseToken = String.valueOf(new Random().nextLong()); |
| switch (message.arg1) { |
| case ConnectivityManager.CAPTIVE_PORTAL_APP_RETURN_DISMISSED: |
| sendMessage(CMD_FORCE_REEVALUATION, 0 /* no UID */, 0); |
| break; |
| case ConnectivityManager.CAPTIVE_PORTAL_APP_RETURN_WANTED_AS_IS: |
| mDontDisplaySigninNotification = true; |
| // TODO: Distinguish this from a network that actually validates. |
| // Displaying the "!" on the system UI icon may still be a good idea. |
| transitionTo(mValidatedState); |
| break; |
| case ConnectivityManager.CAPTIVE_PORTAL_APP_RETURN_UNWANTED: |
| mDontDisplaySigninNotification = true; |
| mUserDoesNotWant = true; |
| mConnectivityServiceHandler.sendMessage(obtainMessage( |
| EVENT_NETWORK_TESTED, NETWORK_TEST_RESULT_INVALID, 0, |
| mNetworkAgentInfo)); |
| // TODO: Should teardown network. |
| mUidResponsibleForReeval = 0; |
| transitionTo(mEvaluatingState); |
| break; |
| } |
| return HANDLED; |
| default: |
| return HANDLED; |
| } |
| } |
| } |
| |
| // Being in the ValidatedState State indicates a Network is: |
| // - Successfully validated, or |
| // - Wanted "as is" by the user, or |
| // - Does not satsify the default NetworkRequest and so validation has been skipped. |
| private class ValidatedState extends State { |
| @Override |
| public void enter() { |
| mConnectivityServiceHandler.sendMessage(obtainMessage(EVENT_NETWORK_TESTED, |
| NETWORK_TEST_RESULT_VALID, 0, mNetworkAgentInfo)); |
| } |
| |
| @Override |
| public boolean processMessage(Message message) { |
| switch (message.what) { |
| case CMD_NETWORK_CONNECTED: |
| transitionTo(mValidatedState); |
| return HANDLED; |
| default: |
| return NOT_HANDLED; |
| } |
| } |
| } |
| |
| // Being in the MaybeNotifyState State indicates the user may have been notified that sign-in |
| // is required. This State takes care to clear the notification upon exit from the State. |
| private class MaybeNotifyState extends State { |
| @Override |
| public boolean processMessage(Message message) { |
| switch (message.what) { |
| case CMD_LAUNCH_CAPTIVE_PORTAL_APP: |
| final Intent intent = new Intent( |
| ConnectivityManager.ACTION_CAPTIVE_PORTAL_SIGN_IN); |
| intent.putExtra(ConnectivityManager.EXTRA_NETWORK, mNetworkAgentInfo.network); |
| intent.putExtra(ConnectivityManager.EXTRA_CAPTIVE_PORTAL_TOKEN, |
| mCaptivePortalLoggedInResponseToken); |
| intent.setFlags( |
| Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT | Intent.FLAG_ACTIVITY_NEW_TASK); |
| mContext.startActivityAsUser(intent, UserHandle.CURRENT); |
| return HANDLED; |
| default: |
| return NOT_HANDLED; |
| } |
| } |
| |
| @Override |
| public void exit() { |
| Message message = obtainMessage(EVENT_PROVISIONING_NOTIFICATION, 0, |
| mNetworkAgentInfo.network.netId, null); |
| mConnectivityServiceHandler.sendMessage(message); |
| } |
| } |
| |
| // Being in the EvaluatingState State indicates the Network is being evaluated for internet |
| // connectivity, or that the user has indicated that this network is unwanted. |
| private class EvaluatingState extends State { |
| private int mReevaluateDelayMs; |
| private int mAttempts; |
| |
| @Override |
| public void enter() { |
| sendMessage(CMD_REEVALUATE, ++mReevaluateToken, 0); |
| if (mUidResponsibleForReeval != INVALID_UID) { |
| TrafficStats.setThreadStatsUid(mUidResponsibleForReeval); |
| mUidResponsibleForReeval = INVALID_UID; |
| } |
| mReevaluateDelayMs = INITIAL_REEVALUATE_DELAY_MS; |
| mAttempts = 0; |
| } |
| |
| @Override |
| public boolean processMessage(Message message) { |
| switch (message.what) { |
| case CMD_REEVALUATE: |
| if (message.arg1 != mReevaluateToken || mUserDoesNotWant) |
| return HANDLED; |
| // Don't bother validating networks that don't satisify the default request. |
| // This includes: |
| // - VPNs which can be considered explicitly desired by the user and the |
| // user's desire trumps whether the network validates. |
| // - Networks that don't provide internet access. It's unclear how to |
| // validate such networks. |
| // - Untrusted networks. It's unsafe to prompt the user to sign-in to |
| // such networks and the user didn't express interest in connecting to |
| // such networks (an app did) so the user may be unhappily surprised when |
| // asked to sign-in to a network they didn't want to connect to in the |
| // first place. Validation could be done to adjust the network scores |
| // however these networks are app-requested and may not be intended for |
| // general usage, in which case general validation may not be an accurate |
| // measure of the network's quality. Only the app knows how to evaluate |
| // the network so don't bother validating here. Furthermore sending HTTP |
| // packets over the network may be undesirable, for example an extremely |
| // expensive metered network, or unwanted leaking of the User Agent string. |
| if (!mDefaultRequest.networkCapabilities.satisfiedByNetworkCapabilities( |
| mNetworkAgentInfo.networkCapabilities)) { |
| transitionTo(mValidatedState); |
| return HANDLED; |
| } |
| mAttempts++; |
| // Note: This call to isCaptivePortal() could take up to a minute. Resolving the |
| // server's IP addresses could hit the DNS timeout, and attempting connections |
| // to each of the server's several IP addresses (currently one IPv4 and one |
| // IPv6) could each take SOCKET_TIMEOUT_MS. During this time this StateMachine |
| // will be unresponsive. isCaptivePortal() could be executed on another Thread |
| // if this is found to cause problems. |
| int httpResponseCode = isCaptivePortal(); |
| if (httpResponseCode == 204) { |
| transitionTo(mValidatedState); |
| } else if (httpResponseCode >= 200 && httpResponseCode <= 399) { |
| transitionTo(mCaptivePortalState); |
| } else { |
| final Message msg = obtainMessage(CMD_REEVALUATE, ++mReevaluateToken, 0); |
| sendMessageDelayed(msg, mReevaluateDelayMs); |
| mConnectivityServiceHandler.sendMessage(obtainMessage( |
| EVENT_NETWORK_TESTED, NETWORK_TEST_RESULT_INVALID, 0, |
| mNetworkAgentInfo)); |
| if (mAttempts >= BLAME_FOR_EVALUATION_ATTEMPTS) { |
| // Don't continue to blame UID forever. |
| TrafficStats.clearThreadStatsUid(); |
| } |
| mReevaluateDelayMs *= 2; |
| if (mReevaluateDelayMs > MAX_REEVALUATE_DELAY_MS) { |
| mReevaluateDelayMs = MAX_REEVALUATE_DELAY_MS; |
| } |
| } |
| return HANDLED; |
| case CMD_FORCE_REEVALUATION: |
| // Before IGNORE_REEVALUATE_ATTEMPTS attempts are made, |
| // ignore any re-evaluation requests. After, restart the |
| // evaluation process via EvaluatingState#enter. |
| return mAttempts < IGNORE_REEVALUATE_ATTEMPTS ? HANDLED : NOT_HANDLED; |
| default: |
| return NOT_HANDLED; |
| } |
| } |
| |
| @Override |
| public void exit() { |
| TrafficStats.clearThreadStatsUid(); |
| } |
| } |
| |
| // BroadcastReceiver that waits for a particular Intent and then posts a message. |
| private class CustomIntentReceiver extends BroadcastReceiver { |
| private final int mToken; |
| private final int mWhat; |
| private final String mAction; |
| CustomIntentReceiver(String action, int token, int what) { |
| mToken = token; |
| mWhat = what; |
| mAction = action + "_" + mNetworkAgentInfo.network.netId + "_" + token; |
| mContext.registerReceiver(this, new IntentFilter(mAction)); |
| } |
| public PendingIntent getPendingIntent() { |
| final Intent intent = new Intent(mAction); |
| intent.setPackage(mContext.getPackageName()); |
| return PendingIntent.getBroadcast(mContext, 0, intent, 0); |
| } |
| @Override |
| public void onReceive(Context context, Intent intent) { |
| if (intent.getAction().equals(mAction)) sendMessage(obtainMessage(mWhat, mToken)); |
| } |
| } |
| |
| // Being in the CaptivePortalState State indicates a captive portal was detected and the user |
| // has been shown a notification to sign-in. |
| private class CaptivePortalState extends State { |
| private static final String ACTION_LAUNCH_CAPTIVE_PORTAL_APP = |
| "android.net.netmon.launchCaptivePortalApp"; |
| |
| @Override |
| public void enter() { |
| mConnectivityServiceHandler.sendMessage(obtainMessage(EVENT_NETWORK_TESTED, |
| NETWORK_TEST_RESULT_INVALID, 0, mNetworkAgentInfo)); |
| // Don't annoy user with sign-in notifications. |
| if (mDontDisplaySigninNotification) return; |
| // Create a CustomIntentReceiver that sends us a |
| // CMD_LAUNCH_CAPTIVE_PORTAL_APP message when the user |
| // touches the notification. |
| if (mLaunchCaptivePortalAppBroadcastReceiver == null) { |
| // Wait for result. |
| mLaunchCaptivePortalAppBroadcastReceiver = new CustomIntentReceiver( |
| ACTION_LAUNCH_CAPTIVE_PORTAL_APP, new Random().nextInt(), |
| CMD_LAUNCH_CAPTIVE_PORTAL_APP); |
| } |
| // Display the sign in notification. |
| Message message = obtainMessage(EVENT_PROVISIONING_NOTIFICATION, 1, |
| mNetworkAgentInfo.network.netId, |
| mLaunchCaptivePortalAppBroadcastReceiver.getPendingIntent()); |
| mConnectivityServiceHandler.sendMessage(message); |
| // Retest for captive portal occasionally. |
| sendMessageDelayed(CMD_CAPTIVE_PORTAL_RECHECK, 0 /* no UID */, |
| CAPTIVE_PORTAL_REEVALUATE_DELAY_MS); |
| } |
| |
| @Override |
| public void exit() { |
| removeMessages(CMD_CAPTIVE_PORTAL_RECHECK); |
| } |
| } |
| |
| // Being in the LingeringState State indicates a Network's validated bit is true and it once |
| // was the highest scoring Network satisfying a particular NetworkRequest, but since then |
| // another Network satsified the NetworkRequest with a higher score and hence this Network |
| // is "lingered" for a fixed period of time before it is disconnected. This period of time |
| // allows apps to wrap up communication and allows for seamless reactivation if the other |
| // higher scoring Network happens to disconnect. |
| private class LingeringState extends State { |
| private static final String ACTION_LINGER_EXPIRED = "android.net.netmon.lingerExpired"; |
| |
| private CustomIntentReceiver mBroadcastReceiver; |
| private PendingIntent mIntent; |
| |
| @Override |
| public void enter() { |
| mLingerToken = new Random().nextInt(); |
| mBroadcastReceiver = new CustomIntentReceiver(ACTION_LINGER_EXPIRED, mLingerToken, |
| CMD_LINGER_EXPIRED); |
| mIntent = mBroadcastReceiver.getPendingIntent(); |
| long wakeupTime = SystemClock.elapsedRealtime() + mLingerDelayMs; |
| mAlarmManager.setWindow(AlarmManager.ELAPSED_REALTIME_WAKEUP, wakeupTime, |
| // Give a specific window so we aren't subject to unknown inexactitude. |
| mLingerDelayMs / 6, mIntent); |
| } |
| |
| @Override |
| public boolean processMessage(Message message) { |
| switch (message.what) { |
| case CMD_NETWORK_CONNECTED: |
| log("Unlingered"); |
| // If already validated, go straight to validated state. |
| if (mNetworkAgentInfo.lastValidated) { |
| transitionTo(mValidatedState); |
| return HANDLED; |
| } |
| return NOT_HANDLED; |
| case CMD_LINGER_EXPIRED: |
| if (message.arg1 != mLingerToken) |
| return HANDLED; |
| mConnectivityServiceHandler.sendMessage( |
| obtainMessage(EVENT_NETWORK_LINGER_COMPLETE, mNetworkAgentInfo)); |
| return HANDLED; |
| case CMD_FORCE_REEVALUATION: |
| // Ignore reevaluation attempts when lingering. A reevaluation could result |
| // in a transition to the validated state which would abort the linger |
| // timeout. Lingering is the result of score assessment; validity is |
| // irrelevant. |
| return HANDLED; |
| case CMD_CAPTIVE_PORTAL_APP_FINISHED: |
| // Ignore user network determination as this could abort linger timeout. |
| // Networks are only lingered once validated because: |
| // - Unvalidated networks are never lingered (see rematchNetworkAndRequests). |
| // - Once validated, a Network's validated bit is never cleared. |
| // Since networks are only lingered after being validated a user's |
| // determination will not change the death sentence that lingering entails: |
| // - If the user wants to use the network or bypasses the captive portal, |
| // the network's score will not be increased beyond its current value |
| // because it is already validated. Without a score increase there is no |
| // chance of reactivation (i.e. aborting linger timeout). |
| // - If the user does not want the network, lingering will disconnect the |
| // network anyhow. |
| return HANDLED; |
| default: |
| return NOT_HANDLED; |
| } |
| } |
| |
| @Override |
| public void exit() { |
| mAlarmManager.cancel(mIntent); |
| mContext.unregisterReceiver(mBroadcastReceiver); |
| } |
| } |
| |
| /** |
| * Do a URL fetch on a known server to see if we get the data we expect. |
| * Returns HTTP response code. |
| */ |
| private int isCaptivePortal() { |
| if (!mIsCaptivePortalCheckEnabled) return 204; |
| |
| HttpURLConnection urlConnection = null; |
| int httpResponseCode = 599; |
| try { |
| URL url = new URL("http", mServer, "/generate_204"); |
| // On networks with a PAC instead of fetching a URL that should result in a 204 |
| // reponse, we instead simply fetch the PAC script. This is done for a few reasons: |
| // 1. At present our PAC code does not yet handle multiple PACs on multiple networks |
| // until something like https://android-review.googlesource.com/#/c/115180/ lands. |
| // Network.openConnection() will ignore network-specific PACs and instead fetch |
| // using NO_PROXY. If a PAC is in place, the only fetch we know will succeed with |
| // NO_PROXY is the fetch of the PAC itself. |
| // 2. To proxy the generate_204 fetch through a PAC would require a number of things |
| // happen before the fetch can commence, namely: |
| // a) the PAC script be fetched |
| // b) a PAC script resolver service be fired up and resolve mServer |
| // Network validation could be delayed until these prerequisities are satisifed or |
| // could simply be left to race them. Neither is an optimal solution. |
| // 3. PAC scripts are sometimes used to block or restrict Internet access and may in |
| // fact block fetching of the generate_204 URL which would lead to false negative |
| // results for network validation. |
| boolean fetchPac = false; |
| final ProxyInfo proxyInfo = mNetworkAgentInfo.linkProperties.getHttpProxy(); |
| if (proxyInfo != null && !Uri.EMPTY.equals(proxyInfo.getPacFileUrl())) { |
| url = new URL(proxyInfo.getPacFileUrl().toString()); |
| fetchPac = true; |
| } |
| final StringBuffer connectInfo = new StringBuffer(); |
| String hostToResolve = null; |
| // Only resolve a host if HttpURLConnection is about to, to avoid any potentially |
| // unnecessary resolution. |
| if (proxyInfo == null || fetchPac) { |
| hostToResolve = url.getHost(); |
| } else if (proxyInfo != null) { |
| hostToResolve = proxyInfo.getHost(); |
| } |
| if (!TextUtils.isEmpty(hostToResolve)) { |
| connectInfo.append(", " + hostToResolve + "="); |
| final InetAddress[] addresses = |
| mNetworkAgentInfo.network.getAllByName(hostToResolve); |
| for (InetAddress address : addresses) { |
| connectInfo.append(address.getHostAddress()); |
| if (address != addresses[addresses.length-1]) connectInfo.append(","); |
| } |
| } |
| validationLog("Checking " + url.toString() + " on " + |
| mNetworkAgentInfo.networkInfo.getExtraInfo() + connectInfo); |
| urlConnection = (HttpURLConnection) mNetworkAgentInfo.network.openConnection(url); |
| urlConnection.setInstanceFollowRedirects(fetchPac); |
| urlConnection.setConnectTimeout(SOCKET_TIMEOUT_MS); |
| urlConnection.setReadTimeout(SOCKET_TIMEOUT_MS); |
| urlConnection.setUseCaches(false); |
| |
| // Time how long it takes to get a response to our request |
| long requestTimestamp = SystemClock.elapsedRealtime(); |
| |
| urlConnection.getInputStream(); |
| |
| // Time how long it takes to get a response to our request |
| long responseTimestamp = SystemClock.elapsedRealtime(); |
| |
| httpResponseCode = urlConnection.getResponseCode(); |
| validationLog("isCaptivePortal: ret=" + httpResponseCode + |
| " headers=" + urlConnection.getHeaderFields()); |
| // NOTE: We may want to consider an "HTTP/1.0 204" response to be a captive |
| // portal. The only example of this seen so far was a captive portal. For |
| // the time being go with prior behavior of assuming it's not a captive |
| // portal. If it is considered a captive portal, a different sign-in URL |
| // is needed (i.e. can't browse a 204). This could be the result of an HTTP |
| // proxy server. |
| |
| // Consider 200 response with "Content-length=0" to not be a captive portal. |
| // There's no point in considering this a captive portal as the user cannot |
| // sign-in to an empty page. Probably the result of a broken transparent proxy. |
| // See http://b/9972012. |
| if (httpResponseCode == 200 && urlConnection.getContentLength() == 0) { |
| validationLog("Empty 200 response interpreted as 204 response."); |
| httpResponseCode = 204; |
| } |
| |
| if (httpResponseCode == 200 && fetchPac) { |
| validationLog("PAC fetch 200 response interpreted as 204 response."); |
| httpResponseCode = 204; |
| } |
| |
| sendNetworkConditionsBroadcast(true /* response received */, |
| httpResponseCode != 204 /* isCaptivePortal */, |
| requestTimestamp, responseTimestamp); |
| } catch (IOException e) { |
| validationLog("Probably not a portal: exception " + e); |
| if (httpResponseCode == 599) { |
| // TODO: Ping gateway and DNS server and log results. |
| } |
| } finally { |
| if (urlConnection != null) { |
| urlConnection.disconnect(); |
| } |
| } |
| return httpResponseCode; |
| } |
| |
| /** |
| * @param responseReceived - whether or not we received a valid HTTP response to our request. |
| * If false, isCaptivePortal and responseTimestampMs are ignored |
| * TODO: This should be moved to the transports. The latency could be passed to the transports |
| * along with the captive portal result. Currently the TYPE_MOBILE broadcasts appear unused so |
| * perhaps this could just be added to the WiFi transport only. |
| */ |
| private void sendNetworkConditionsBroadcast(boolean responseReceived, boolean isCaptivePortal, |
| long requestTimestampMs, long responseTimestampMs) { |
| if (Settings.Global.getInt(mContext.getContentResolver(), |
| Settings.Global.WIFI_SCAN_ALWAYS_AVAILABLE, 0) == 0) { |
| return; |
| } |
| |
| if (systemReady == false) return; |
| |
| Intent latencyBroadcast = new Intent(ACTION_NETWORK_CONDITIONS_MEASURED); |
| switch (mNetworkAgentInfo.networkInfo.getType()) { |
| case ConnectivityManager.TYPE_WIFI: |
| WifiInfo currentWifiInfo = mWifiManager.getConnectionInfo(); |
| if (currentWifiInfo != null) { |
| // NOTE: getSSID()'s behavior changed in API 17; before that, SSIDs were not |
| // surrounded by double quotation marks (thus violating the Javadoc), but this |
| // was changed to match the Javadoc in API 17. Since clients may have started |
| // sanitizing the output of this method since API 17 was released, we should |
| // not change it here as it would become impossible to tell whether the SSID is |
| // simply being surrounded by quotes due to the API, or whether those quotes |
| // are actually part of the SSID. |
| latencyBroadcast.putExtra(EXTRA_SSID, currentWifiInfo.getSSID()); |
| latencyBroadcast.putExtra(EXTRA_BSSID, currentWifiInfo.getBSSID()); |
| } else { |
| if (DBG) logw("network info is TYPE_WIFI but no ConnectionInfo found"); |
| return; |
| } |
| break; |
| case ConnectivityManager.TYPE_MOBILE: |
| latencyBroadcast.putExtra(EXTRA_NETWORK_TYPE, mTelephonyManager.getNetworkType()); |
| List<CellInfo> info = mTelephonyManager.getAllCellInfo(); |
| if (info == null) return; |
| int numRegisteredCellInfo = 0; |
| for (CellInfo cellInfo : info) { |
| if (cellInfo.isRegistered()) { |
| numRegisteredCellInfo++; |
| if (numRegisteredCellInfo > 1) { |
| log("more than one registered CellInfo. Can't " + |
| "tell which is active. Bailing."); |
| return; |
| } |
| if (cellInfo instanceof CellInfoCdma) { |
| CellIdentityCdma cellId = ((CellInfoCdma) cellInfo).getCellIdentity(); |
| latencyBroadcast.putExtra(EXTRA_CELL_ID, cellId); |
| } else if (cellInfo instanceof CellInfoGsm) { |
| CellIdentityGsm cellId = ((CellInfoGsm) cellInfo).getCellIdentity(); |
| latencyBroadcast.putExtra(EXTRA_CELL_ID, cellId); |
| } else if (cellInfo instanceof CellInfoLte) { |
| CellIdentityLte cellId = ((CellInfoLte) cellInfo).getCellIdentity(); |
| latencyBroadcast.putExtra(EXTRA_CELL_ID, cellId); |
| } else if (cellInfo instanceof CellInfoWcdma) { |
| CellIdentityWcdma cellId = ((CellInfoWcdma) cellInfo).getCellIdentity(); |
| latencyBroadcast.putExtra(EXTRA_CELL_ID, cellId); |
| } else { |
| if (DBG) logw("Registered cellinfo is unrecognized"); |
| return; |
| } |
| } |
| } |
| break; |
| default: |
| return; |
| } |
| latencyBroadcast.putExtra(EXTRA_CONNECTIVITY_TYPE, mNetworkAgentInfo.networkInfo.getType()); |
| latencyBroadcast.putExtra(EXTRA_RESPONSE_RECEIVED, responseReceived); |
| latencyBroadcast.putExtra(EXTRA_REQUEST_TIMESTAMP_MS, requestTimestampMs); |
| |
| if (responseReceived) { |
| latencyBroadcast.putExtra(EXTRA_IS_CAPTIVE_PORTAL, isCaptivePortal); |
| latencyBroadcast.putExtra(EXTRA_RESPONSE_TIMESTAMP_MS, responseTimestampMs); |
| } |
| mContext.sendBroadcastAsUser(latencyBroadcast, UserHandle.CURRENT, |
| PERMISSION_ACCESS_NETWORK_CONDITIONS); |
| } |
| |
| // Allow tests to override linger time. |
| @VisibleForTesting |
| public static void SetDefaultLingerTime(int time_ms) { |
| if (Process.myUid() == Process.SYSTEM_UID) { |
| throw new SecurityException("SetDefaultLingerTime only for internal testing."); |
| } |
| DEFAULT_LINGER_DELAY_MS = time_ms; |
| } |
| } |
