| /* |
| * 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.Network; |
| import android.net.NetworkCapabilities; |
| import android.net.NetworkInfo; |
| import android.net.NetworkRequest; |
| 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.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.util.Log; |
| |
| import com.android.internal.util.Protocol; |
| import com.android.internal.util.State; |
| import com.android.internal.util.StateMachine; |
| import com.android.server.ConnectivityService; |
| import com.android.server.connectivity.NetworkAgentInfo; |
| |
| import java.io.IOException; |
| import java.net.HttpURLConnection; |
| 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 = "clients3.google.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"; |
| |
| // Keep these in sync with CaptivePortalLoginActivity.java. |
| // Intent broadcast from CaptivePortalLogin indicating sign-in is complete. |
| // Extras: |
| // EXTRA_TEXT = netId |
| // LOGGED_IN_RESULT = one of the CAPTIVE_PORTAL_APP_RETURN_* values below. |
| // RESPONSE_TOKEN = data fragment from launching Intent |
| private static final String ACTION_CAPTIVE_PORTAL_LOGGED_IN = |
| "android.net.netmon.captive_portal_logged_in"; |
| private static final String LOGGED_IN_RESULT = "result"; |
| private static final String RESPONSE_TOKEN = "response_token"; |
| |
| // 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_APPEASED, |
| * CAPTIVE_PORTAL_APP_RETURN_UNWANTED, |
| * CAPTIVE_PORTAL_APP_RETURN_WANTED_AS_IS |
| */ |
| private 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 bypassed captive portal. |
| */ |
| private static final int EVENT_APP_BYPASSED_CAPTIVE_PORTAL = BASE + 11; |
| |
| /** |
| * Message to self indicating no sign-in app responded. |
| */ |
| private static final int EVENT_NO_APP_RESPONSE = BASE + 12; |
| |
| /** |
| * Message to self indicating sign-in app indicates sign-in is not possible. |
| */ |
| private static final int EVENT_APP_INDICATES_SIGN_IN_IMPOSSIBLE = BASE + 13; |
| |
| /** |
| * Return codes from captive portal sign-in app. |
| */ |
| public static final int CAPTIVE_PORTAL_APP_RETURN_APPEASED = 0; |
| public static final int CAPTIVE_PORTAL_APP_RETURN_UNWANTED = 1; |
| public static final int CAPTIVE_PORTAL_APP_RETURN_WANTED_AS_IS = 2; |
| |
| private static final String LINGER_DELAY_PROPERTY = "persist.netmon.linger"; |
| // Default to 30s linger time-out. |
| private static final int DEFAULT_LINGER_DELAY_MS = 30000; |
| private final int mLingerDelayMs; |
| private int mLingerToken = 0; |
| |
| // Negative values disable reevaluation. |
| private static final String REEVALUATE_DELAY_PROPERTY = "persist.netmon.reeval_delay"; |
| // Default to 5s reevaluation delay. |
| private static final int DEFAULT_REEVALUATE_DELAY_MS = 5000; |
| private static final int MAX_RETRIES = 10; |
| // Between groups of MAX_RETRIES evaluation attempts, pause 10 mins in hopes ISP outage passes. |
| private static final int REEVALUATE_PAUSE_MS = 10*60*1000; |
| private final int mReevaluateDelayMs; |
| private int mReevaluateToken = 0; |
| private static final int INVALID_UID = -1; |
| private int mUidResponsibleForReeval = INVALID_UID; |
| |
| 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; |
| |
| public boolean systemReady = false; |
| |
| private final State mDefaultState = new DefaultState(); |
| private final State mOfflineState = new OfflineState(); |
| 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 CaptivePortalLoggedInBroadcastReceiver mCaptivePortalLoggedInBroadcastReceiver = null; |
| private String mCaptivePortalLoggedInResponseToken = null; |
| |
| 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(mOfflineState, 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); |
| mReevaluateDelayMs = SystemProperties.getInt(REEVALUATE_DELAY_PROPERTY, |
| DEFAULT_REEVALUATE_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) { |
| Log.d(TAG + "/" + mNetworkAgentInfo.name(), s); |
| } |
| |
| // 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) { |
| if (DBG) log(getName() + message.toString()); |
| switch (message.what) { |
| case CMD_NETWORK_LINGER: |
| if (DBG) log("Lingering"); |
| transitionTo(mLingeringState); |
| return HANDLED; |
| case CMD_NETWORK_CONNECTED: |
| if (DBG) log("Connected"); |
| transitionTo(mEvaluatingState); |
| return HANDLED; |
| case CMD_NETWORK_DISCONNECTED: |
| if (DBG) log("Disconnected - quitting"); |
| if (mCaptivePortalLoggedInBroadcastReceiver != null) { |
| mContext.unregisterReceiver(mCaptivePortalLoggedInBroadcastReceiver); |
| mCaptivePortalLoggedInBroadcastReceiver = null; |
| } |
| quit(); |
| return HANDLED; |
| case CMD_FORCE_REEVALUATION: |
| if (DBG) log("Forcing reevaluation"); |
| mUidResponsibleForReeval = message.arg1; |
| transitionTo(mEvaluatingState); |
| return HANDLED; |
| case CMD_CAPTIVE_PORTAL_APP_FINISHED: |
| // Previous token was broadcast, come up with a new one. |
| mCaptivePortalLoggedInResponseToken = String.valueOf(new Random().nextLong()); |
| switch (message.arg1) { |
| case CAPTIVE_PORTAL_APP_RETURN_APPEASED: |
| case CAPTIVE_PORTAL_APP_RETURN_WANTED_AS_IS: |
| transitionTo(mValidatedState); |
| break; |
| case CAPTIVE_PORTAL_APP_RETURN_UNWANTED: |
| mUserDoesNotWant = true; |
| // TODO: Should teardown network. |
| transitionTo(mOfflineState); |
| break; |
| } |
| return HANDLED; |
| default: |
| return HANDLED; |
| } |
| } |
| } |
| |
| // Being in the OfflineState State indicates a Network is unwanted or failed validation. |
| private class OfflineState extends State { |
| @Override |
| public void enter() { |
| mConnectivityServiceHandler.sendMessage(obtainMessage(EVENT_NETWORK_TESTED, |
| NETWORK_TEST_RESULT_INVALID, 0, mNetworkAgentInfo)); |
| if (!mUserDoesNotWant) sendMessageDelayed(CMD_FORCE_REEVALUATION, REEVALUATE_PAUSE_MS); |
| } |
| |
| @Override |
| public boolean processMessage(Message message) { |
| if (DBG) log(getName() + message.toString()); |
| switch (message.what) { |
| case CMD_FORCE_REEVALUATION: |
| // If the user has indicated they explicitly do not want to use this network, |
| // don't allow a reevaluation as this will be pointless and could result in |
| // the user being annoyed with repeated unwanted notifications. |
| return mUserDoesNotWant ? HANDLED : NOT_HANDLED; |
| default: |
| return NOT_HANDLED; |
| } |
| } |
| |
| @Override |
| public void exit() { |
| // NOTE: This removes the delayed message posted by enter() but will inadvertently |
| // remove any other CMD_FORCE_REEVALUATION in the message queue. At the moment this |
| // is harmless. If in the future this becomes problematic a different message could |
| // be used. |
| removeMessages(CMD_FORCE_REEVALUATION); |
| } |
| } |
| |
| // 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() { |
| if (DBG) log("Validated"); |
| mConnectivityServiceHandler.sendMessage(obtainMessage(EVENT_NETWORK_TESTED, |
| NETWORK_TEST_RESULT_VALID, 0, mNetworkAgentInfo)); |
| } |
| |
| @Override |
| public boolean processMessage(Message message) { |
| if (DBG) log(getName() + message.toString()); |
| 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 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. |
| private class EvaluatingState extends State { |
| private int mRetries; |
| |
| @Override |
| public void enter() { |
| mRetries = 0; |
| sendMessage(CMD_REEVALUATE, ++mReevaluateToken, 0); |
| if (mUidResponsibleForReeval != INVALID_UID) { |
| TrafficStats.setThreadStatsUid(mUidResponsibleForReeval); |
| mUidResponsibleForReeval = INVALID_UID; |
| } |
| } |
| |
| @Override |
| public boolean processMessage(Message message) { |
| if (DBG) log(getName() + message.toString()); |
| switch (message.what) { |
| case CMD_REEVALUATE: |
| if (message.arg1 != mReevaluateToken) |
| 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; |
| } |
| // Note: This call to isCaptivePortal() could take minutes. Resolving the |
| // server's IP addresses could hit the DNS timeout and attempting connections |
| // to each of the server's several (e.g. 11) IP addresses 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 if (++mRetries > MAX_RETRIES) { |
| transitionTo(mOfflineState); |
| } else if (mReevaluateDelayMs >= 0) { |
| Message msg = obtainMessage(CMD_REEVALUATE, ++mReevaluateToken, 0); |
| sendMessageDelayed(msg, mReevaluateDelayMs); |
| } |
| return HANDLED; |
| case CMD_FORCE_REEVALUATION: |
| // Ignore duplicate requests. |
| return 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() { |
| return PendingIntent.getBroadcast(mContext, 0, new Intent(mAction), 0); |
| } |
| @Override |
| public void onReceive(Context context, Intent intent) { |
| if (intent.getAction().equals(mAction)) sendMessage(obtainMessage(mWhat, mToken)); |
| } |
| } |
| |
| private class CaptivePortalLoggedInBroadcastReceiver extends BroadcastReceiver { |
| @Override |
| public void onReceive(Context context, Intent intent) { |
| if (Integer.parseInt(intent.getStringExtra(Intent.EXTRA_TEXT)) == |
| mNetworkAgentInfo.network.netId && |
| mCaptivePortalLoggedInResponseToken.equals( |
| intent.getStringExtra(RESPONSE_TOKEN))) { |
| sendMessage(obtainMessage(CMD_CAPTIVE_PORTAL_APP_FINISHED, |
| Integer.parseInt(intent.getStringExtra(LOGGED_IN_RESULT)), 0)); |
| } |
| } |
| } |
| |
| // 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 { |
| @Override |
| public void enter() { |
| mConnectivityServiceHandler.sendMessage(obtainMessage(EVENT_NETWORK_TESTED, |
| NETWORK_TEST_RESULT_INVALID, 0, mNetworkAgentInfo)); |
| |
| // Assemble Intent to launch captive portal sign-in app. |
| final Intent intent = new Intent(Intent.ACTION_SEND); |
| // Intent cannot use extras because PendingIntent.getActivity will merge matching |
| // Intents erasing extras. Use data instead of extras to encode NetID. |
| intent.setData(Uri.fromParts("netid", Integer.toString(mNetworkAgentInfo.network.netId), |
| mCaptivePortalLoggedInResponseToken)); |
| intent.setComponent(new ComponentName("com.android.captiveportallogin", |
| "com.android.captiveportallogin.CaptivePortalLoginActivity")); |
| intent.setFlags(Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT | Intent.FLAG_ACTIVITY_NEW_TASK); |
| |
| if (mCaptivePortalLoggedInBroadcastReceiver == null) { |
| // Wait for result. |
| mCaptivePortalLoggedInBroadcastReceiver = |
| new CaptivePortalLoggedInBroadcastReceiver(); |
| final IntentFilter filter = new IntentFilter(ACTION_CAPTIVE_PORTAL_LOGGED_IN); |
| mContext.registerReceiver(mCaptivePortalLoggedInBroadcastReceiver, filter); |
| } |
| // Initiate notification to sign-in. |
| Message message = obtainMessage(EVENT_PROVISIONING_NOTIFICATION, 1, |
| mNetworkAgentInfo.network.netId, |
| PendingIntent.getActivity(mContext, 0, intent, 0)); |
| mConnectivityServiceHandler.sendMessage(message); |
| } |
| |
| @Override |
| public boolean processMessage(Message message) { |
| if (DBG) log(getName() + message.toString()); |
| return NOT_HANDLED; |
| } |
| } |
| |
| // 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) { |
| if (DBG) log(getName() + message.toString()); |
| switch (message.what) { |
| case CMD_NETWORK_CONNECTED: |
| // Go straight to active as we've already evaluated. |
| transitionTo(mValidatedState); |
| return 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"); |
| if (DBG) { |
| log("Checking " + url.toString() + " on " + |
| mNetworkAgentInfo.networkInfo.getExtraInfo()); |
| } |
| urlConnection = (HttpURLConnection) mNetworkAgentInfo.network.openConnection(url); |
| urlConnection.setInstanceFollowRedirects(false); |
| 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(); |
| if (DBG) { |
| log("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) { |
| if (DBG) log("Empty 200 response interpreted as 204 response."); |
| httpResponseCode = 204; |
| } |
| |
| sendNetworkConditionsBroadcast(true /* response received */, |
| httpResponseCode != 204 /* isCaptivePortal */, |
| requestTimestamp, responseTimestamp); |
| } catch (IOException e) { |
| if (DBG) log("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) { |
| if (DBG) log("Don't send network conditions - lacking user consent."); |
| 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) { |
| if (DBG) 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); |
| } |
| } |
