| /* |
| * 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.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.os.Handler; |
| import android.os.Message; |
| import android.os.SystemProperties; |
| import android.os.UserHandle; |
| import android.provider.Settings; |
| |
| 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.BufferedReader; |
| import java.io.InputStreamReader; |
| import java.io.IOException; |
| import java.io.OutputStreamWriter; |
| import java.net.HttpURLConnection; |
| import java.net.InetAddress; |
| import java.net.InetSocketAddress; |
| import java.net.Socket; |
| import java.net.URL; |
| |
| /** |
| * {@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; |
| |
| // Intent broadcast when user selects sign-in notification. |
| private static final String ACTION_SIGN_IN_REQUESTED = |
| "android.net.netmon.sign_in_requested"; |
| |
| // Keep these in sync with CaptivePortalLoginActivity.java. |
| // Intent broadcast from CaptivePortalLogin indicating sign-in is complete. |
| // Extras: |
| // EXTRA_TEXT = netId |
| // LOGGED_IN_RESULT = "1" if we should use network, "0" if not. |
| 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 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 is validated. |
| * obj = NetworkAgentInfo |
| */ |
| public static final int EVENT_NETWORK_VALIDATED = 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; |
| |
| /** |
| * Message to self indicating network evaluation is complete. |
| * arg1 = Token to ignore old messages. |
| * arg2 = HTTP response code of network evaluation. |
| */ |
| private static final int EVENT_REEVALUATION_COMPLETE = BASE + 7; |
| |
| /** |
| * Inform NetworkMonitor that the network has disconnected. |
| */ |
| public static final int CMD_NETWORK_DISCONNECTED = BASE + 8; |
| |
| /** |
| * Force evaluation even if it has succeeded in the past. |
| */ |
| public static final int CMD_FORCE_REEVALUATION = BASE + 9; |
| |
| /** |
| * Message to self indicating captive portal login is complete. |
| * arg1 = Token to ignore old messages. |
| * arg2 = 1 if we should use this network, 0 otherwise. |
| */ |
| private static final int CMD_CAPTIVE_PORTAL_LOGGED_IN = BASE + 10; |
| |
| /** |
| * Message to self indicating user desires to log into captive portal. |
| * arg1 = Token to ignore old messages. |
| */ |
| private static final int CMD_USER_WANTS_SIGN_IN = BASE + 11; |
| |
| /** |
| * Request ConnectivityService display provisioning notification. |
| * arg1 = Whether to make the notification visible. |
| * obj = Intent to be launched when notification selected by user. |
| * replyTo = NetworkAgentInfo.messenger so ConnectivityService can identify sender. |
| */ |
| public static final int EVENT_PROVISIONING_NOTIFICATION = BASE + 12; |
| |
| /** |
| * Message to self indicating sign-in app bypassed captive portal. |
| */ |
| private static final int EVENT_APP_BYPASSED_CAPTIVE_PORTAL = BASE + 13; |
| |
| /** |
| * Message to self indicating no sign-in app responded. |
| */ |
| private static final int EVENT_NO_APP_RESPONSE = BASE + 14; |
| |
| /** |
| * Message to self indicating sign-in app indicates sign-in is not possible. |
| */ |
| private static final int EVENT_APP_INDICATES_SIGN_IN_IMPOSSIBLE = BASE + 15; |
| |
| 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; |
| private final int mReevaluateDelayMs; |
| private int mReevaluateToken = 0; |
| |
| private int mCaptivePortalLoggedInToken = 0; |
| private int mUserPromptedToken = 0; |
| |
| private final Context mContext; |
| private final Handler mConnectivityServiceHandler; |
| private final NetworkAgentInfo mNetworkAgentInfo; |
| |
| private String mServer; |
| private boolean mIsCaptivePortalCheckEnabled = false; |
| |
| private State mDefaultState = new DefaultState(); |
| private State mOfflineState = new OfflineState(); |
| private State mValidatedState = new ValidatedState(); |
| private State mEvaluatingState = new EvaluatingState(); |
| private State mUninteractiveAppsPromptedState = new UninteractiveAppsPromptedState(); |
| private State mUserPromptedState = new UserPromptedState(); |
| private State mInteractiveAppsPromptedState = new InteractiveAppsPromptedState(); |
| private State mCaptivePortalState = new CaptivePortalState(); |
| private State mLingeringState = new LingeringState(); |
| |
| public NetworkMonitor(Context context, Handler handler, NetworkAgentInfo networkAgentInfo) { |
| // Add suffix indicating which NetworkMonitor we're talking about. |
| super(TAG + networkAgentInfo.name()); |
| |
| mContext = context; |
| mConnectivityServiceHandler = handler; |
| mNetworkAgentInfo = networkAgentInfo; |
| |
| addState(mDefaultState); |
| addState(mOfflineState, mDefaultState); |
| addState(mValidatedState, mDefaultState); |
| addState(mEvaluatingState, mDefaultState); |
| addState(mUninteractiveAppsPromptedState, mDefaultState); |
| addState(mUserPromptedState, mDefaultState); |
| addState(mInteractiveAppsPromptedState, mDefaultState); |
| addState(mCaptivePortalState, mDefaultState); |
| addState(mLingeringState, mDefaultState); |
| setInitialState(mOfflineState); |
| |
| 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; |
| |
| start(); |
| } |
| |
| 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); |
| break; |
| case CMD_NETWORK_CONNECTED: |
| if (DBG) log("Connected"); |
| transitionTo(mEvaluatingState); |
| break; |
| case CMD_NETWORK_DISCONNECTED: |
| if (DBG) log("Disconnected"); |
| transitionTo(mOfflineState); |
| break; |
| case CMD_FORCE_REEVALUATION: |
| if (DBG) log("Forcing reevaluation"); |
| transitionTo(mEvaluatingState); |
| break; |
| default: |
| break; |
| } |
| return HANDLED; |
| } |
| } |
| |
| private class OfflineState extends State { |
| @Override |
| public boolean processMessage(Message message) { |
| if (DBG) log(getName() + message.toString()); |
| return NOT_HANDLED; |
| } |
| } |
| |
| private class ValidatedState extends State { |
| @Override |
| public void enter() { |
| if (DBG) log("Validated"); |
| mConnectivityServiceHandler.sendMessage( |
| obtainMessage(EVENT_NETWORK_VALIDATED, mNetworkAgentInfo)); |
| } |
| |
| @Override |
| public boolean processMessage(Message message) { |
| if (DBG) log(getName() + message.toString()); |
| switch (message.what) { |
| case CMD_NETWORK_CONNECTED: |
| transitionTo(mValidatedState); |
| break; |
| default: |
| return NOT_HANDLED; |
| } |
| return HANDLED; |
| } |
| } |
| |
| private class EvaluatingState extends State { |
| private int mRetries; |
| |
| private class EvaluateInternetConnectivity extends Thread { |
| private int mToken; |
| EvaluateInternetConnectivity(int token) { |
| mToken = token; |
| } |
| public void run() { |
| sendMessage(EVENT_REEVALUATION_COMPLETE, mToken, isCaptivePortal()); |
| } |
| } |
| |
| @Override |
| public void enter() { |
| mRetries = 0; |
| sendMessage(CMD_REEVALUATE, ++mReevaluateToken, 0); |
| } |
| |
| @Override |
| public boolean processMessage(Message message) { |
| if (DBG) log(getName() + message.toString()); |
| switch (message.what) { |
| case CMD_REEVALUATE: |
| if (message.arg1 != mReevaluateToken) |
| break; |
| // If network provides no internet connectivity adjust evaluation. |
| if (!mNetworkAgentInfo.networkCapabilities.hasCapability( |
| NetworkCapabilities.NET_CAPABILITY_INTERNET)) { |
| // TODO: Try to verify something works. Do all gateways respond to pings? |
| transitionTo(mValidatedState); |
| } |
| // Kick off a thread to perform internet connectivity evaluation. |
| Thread thread = new EvaluateInternetConnectivity(mReevaluateToken); |
| thread.run(); |
| break; |
| case EVENT_REEVALUATION_COMPLETE: |
| if (message.arg1 != mReevaluateToken) |
| break; |
| int httpResponseCode = message.arg2; |
| if (httpResponseCode == 204) { |
| transitionTo(mValidatedState); |
| } else if (httpResponseCode >= 200 && httpResponseCode <= 399) { |
| transitionTo(mUninteractiveAppsPromptedState); |
| } else if (++mRetries > MAX_RETRIES) { |
| transitionTo(mOfflineState); |
| } else if (mReevaluateDelayMs >= 0) { |
| Message msg = obtainMessage(CMD_REEVALUATE, ++mReevaluateToken, 0); |
| sendMessageDelayed(msg, mReevaluateDelayMs); |
| } |
| break; |
| default: |
| return NOT_HANDLED; |
| } |
| return HANDLED; |
| } |
| } |
| |
| private class AppRespondedBroadcastReceiver extends BroadcastReceiver { |
| private static final int CAPTIVE_PORTAL_UNINITIALIZED_RETURN_CODE = 0; |
| private boolean mCanceled; |
| AppRespondedBroadcastReceiver() { |
| mCanceled = false; |
| } |
| public void send(String action) { |
| Intent intent = new Intent(action); |
| intent.putExtra(ConnectivityManager.EXTRA_NETWORK, mNetworkAgentInfo.network); |
| mContext.sendOrderedBroadcastAsUser(intent, UserHandle.ALL, null, this, getHandler(), |
| CAPTIVE_PORTAL_UNINITIALIZED_RETURN_CODE, null, null); |
| } |
| public void cancel() { |
| mCanceled = true; |
| } |
| @Override |
| public void onReceive(Context context, Intent intent) { |
| if (!mCanceled) { |
| cancel(); |
| switch (getResultCode()) { |
| case ConnectivityManager.CAPTIVE_PORTAL_SIGNED_IN: |
| sendMessage(EVENT_APP_BYPASSED_CAPTIVE_PORTAL); |
| break; |
| case ConnectivityManager.CAPTIVE_PORTAL_DISCONNECT: |
| sendMessage(EVENT_APP_INDICATES_SIGN_IN_IMPOSSIBLE); |
| break; |
| // NOTE: This case label makes compiler enforce no overlap between result codes. |
| case CAPTIVE_PORTAL_UNINITIALIZED_RETURN_CODE: |
| default: |
| sendMessage(EVENT_NO_APP_RESPONSE); |
| break; |
| } |
| } |
| } |
| } |
| |
| private class UninteractiveAppsPromptedState extends State { |
| private AppRespondedBroadcastReceiver mReceiver; |
| @Override |
| public void enter() { |
| mReceiver = new AppRespondedBroadcastReceiver(); |
| mReceiver.send(ConnectivityManager.ACTION_CAPTIVE_PORTAL_DETECTED); |
| } |
| @Override |
| public boolean processMessage(Message message) { |
| if (DBG) log(getName() + message.toString()); |
| switch (message.what) { |
| case EVENT_APP_BYPASSED_CAPTIVE_PORTAL: |
| transitionTo(mValidatedState); |
| break; |
| case EVENT_APP_INDICATES_SIGN_IN_IMPOSSIBLE: |
| transitionTo(mOfflineState); |
| break; |
| case EVENT_NO_APP_RESPONSE: |
| transitionTo(mUserPromptedState); |
| break; |
| default: |
| return NOT_HANDLED; |
| } |
| return HANDLED; |
| } |
| public void exit() { |
| mReceiver.cancel(); |
| } |
| } |
| |
| private class UserPromptedState extends State { |
| private class UserRespondedBroadcastReceiver extends BroadcastReceiver { |
| private final int mToken; |
| UserRespondedBroadcastReceiver(int token) { |
| mToken = token; |
| } |
| @Override |
| public void onReceive(Context context, Intent intent) { |
| if (Integer.parseInt(intent.getStringExtra(Intent.EXTRA_TEXT)) == |
| mNetworkAgentInfo.network.netId) { |
| sendMessage(obtainMessage(CMD_USER_WANTS_SIGN_IN, mToken)); |
| } |
| } |
| } |
| |
| private UserRespondedBroadcastReceiver mUserRespondedBroadcastReceiver; |
| |
| @Override |
| public void enter() { |
| // Wait for user to select sign-in notifcation. |
| mUserRespondedBroadcastReceiver = new UserRespondedBroadcastReceiver( |
| ++mUserPromptedToken); |
| IntentFilter filter = new IntentFilter(ACTION_SIGN_IN_REQUESTED); |
| mContext.registerReceiver(mUserRespondedBroadcastReceiver, filter); |
| // Initiate notification to sign-in. |
| Intent intent = new Intent(ACTION_SIGN_IN_REQUESTED); |
| intent.putExtra(Intent.EXTRA_TEXT, String.valueOf(mNetworkAgentInfo.network.netId)); |
| Message message = obtainMessage(EVENT_PROVISIONING_NOTIFICATION, 1, 0, |
| PendingIntent.getBroadcast(mContext, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT)); |
| message.replyTo = mNetworkAgentInfo.messenger; |
| mConnectivityServiceHandler.sendMessage(message); |
| } |
| |
| @Override |
| public boolean processMessage(Message message) { |
| if (DBG) log(getName() + message.toString()); |
| switch (message.what) { |
| case CMD_USER_WANTS_SIGN_IN: |
| if (message.arg1 != mUserPromptedToken) |
| break; |
| transitionTo(mInteractiveAppsPromptedState); |
| break; |
| default: |
| return NOT_HANDLED; |
| } |
| return HANDLED; |
| } |
| |
| @Override |
| public void exit() { |
| Message message = obtainMessage(EVENT_PROVISIONING_NOTIFICATION, 0, 0, null); |
| message.replyTo = mNetworkAgentInfo.messenger; |
| mConnectivityServiceHandler.sendMessage(message); |
| mContext.unregisterReceiver(mUserRespondedBroadcastReceiver); |
| mUserRespondedBroadcastReceiver = null; |
| } |
| } |
| |
| private class InteractiveAppsPromptedState extends State { |
| private AppRespondedBroadcastReceiver mReceiver; |
| @Override |
| public void enter() { |
| mReceiver = new AppRespondedBroadcastReceiver(); |
| mReceiver.send(ConnectivityManager.ACTION_CAPTIVE_PORTAL_SIGN_IN); |
| } |
| @Override |
| public boolean processMessage(Message message) { |
| if (DBG) log(getName() + message.toString()); |
| switch (message.what) { |
| case EVENT_APP_BYPASSED_CAPTIVE_PORTAL: |
| transitionTo(mValidatedState); |
| break; |
| case EVENT_APP_INDICATES_SIGN_IN_IMPOSSIBLE: |
| transitionTo(mOfflineState); |
| break; |
| case EVENT_NO_APP_RESPONSE: |
| transitionTo(mCaptivePortalState); |
| break; |
| default: |
| return NOT_HANDLED; |
| } |
| return HANDLED; |
| } |
| public void exit() { |
| mReceiver.cancel(); |
| } |
| } |
| |
| private class CaptivePortalState extends State { |
| private class CaptivePortalLoggedInBroadcastReceiver extends BroadcastReceiver { |
| private final int mToken; |
| |
| CaptivePortalLoggedInBroadcastReceiver(int token) { |
| mToken = token; |
| } |
| |
| @Override |
| public void onReceive(Context context, Intent intent) { |
| if (Integer.parseInt(intent.getStringExtra(Intent.EXTRA_TEXT)) == |
| mNetworkAgentInfo.network.netId) { |
| sendMessage(obtainMessage(CMD_CAPTIVE_PORTAL_LOGGED_IN, mToken, |
| Integer.parseInt(intent.getStringExtra(LOGGED_IN_RESULT)))); |
| } |
| } |
| } |
| |
| private CaptivePortalLoggedInBroadcastReceiver mCaptivePortalLoggedInBroadcastReceiver; |
| |
| @Override |
| public void enter() { |
| Intent intent = new Intent(Intent.ACTION_SEND); |
| intent.putExtra(Intent.EXTRA_TEXT, String.valueOf(mNetworkAgentInfo.network.netId)); |
| intent.setType("text/plain"); |
| intent.setComponent(new ComponentName("com.android.captiveportallogin", |
| "com.android.captiveportallogin.CaptivePortalLoginActivity")); |
| intent.setFlags(Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT | Intent.FLAG_ACTIVITY_NEW_TASK); |
| |
| // Wait for result. |
| mCaptivePortalLoggedInBroadcastReceiver = new CaptivePortalLoggedInBroadcastReceiver( |
| ++mCaptivePortalLoggedInToken); |
| IntentFilter filter = new IntentFilter(ACTION_CAPTIVE_PORTAL_LOGGED_IN); |
| mContext.registerReceiver(mCaptivePortalLoggedInBroadcastReceiver, filter); |
| // Initiate app to log in. |
| mContext.startActivityAsUser(intent, UserHandle.CURRENT); |
| } |
| |
| @Override |
| public boolean processMessage(Message message) { |
| if (DBG) log(getName() + message.toString()); |
| switch (message.what) { |
| case CMD_CAPTIVE_PORTAL_LOGGED_IN: |
| if (message.arg1 != mCaptivePortalLoggedInToken) |
| break; |
| if (message.arg2 == 0) { |
| // TODO: Should teardown network. |
| transitionTo(mOfflineState); |
| } else { |
| transitionTo(mValidatedState); |
| } |
| break; |
| default: |
| return NOT_HANDLED; |
| } |
| return HANDLED; |
| } |
| |
| @Override |
| public void exit() { |
| mContext.unregisterReceiver(mCaptivePortalLoggedInBroadcastReceiver); |
| mCaptivePortalLoggedInBroadcastReceiver = null; |
| } |
| } |
| |
| private class LingeringState extends State { |
| @Override |
| public void enter() { |
| Message message = obtainMessage(CMD_LINGER_EXPIRED, ++mLingerToken, 0); |
| sendMessageDelayed(message, mLingerDelayMs); |
| } |
| |
| @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); |
| break; |
| case CMD_LINGER_EXPIRED: |
| if (message.arg1 != mLingerToken) |
| break; |
| mConnectivityServiceHandler.sendMessage( |
| obtainMessage(EVENT_NETWORK_LINGER_COMPLETE, mNetworkAgentInfo)); |
| break; |
| default: |
| return NOT_HANDLED; |
| } |
| return HANDLED; |
| } |
| } |
| |
| /** |
| * 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; |
| |
| String urlString = "http://" + mServer + "/generate_204"; |
| if (DBG) { |
| log("Checking " + urlString + " on " + mNetworkAgentInfo.networkInfo.getExtraInfo()); |
| } |
| HttpURLConnection urlConnection = null; |
| Socket socket = null; |
| int httpResponseCode = 599; |
| try { |
| URL url = new URL(urlString); |
| if (false) { |
| // TODO: Need to add URLConnection.setNetwork() before we can enable. |
| urlConnection = (HttpURLConnection) url.openConnection(); |
| urlConnection.setInstanceFollowRedirects(false); |
| urlConnection.setConnectTimeout(SOCKET_TIMEOUT_MS); |
| urlConnection.setReadTimeout(SOCKET_TIMEOUT_MS); |
| urlConnection.setUseCaches(false); |
| urlConnection.getInputStream(); |
| httpResponseCode = urlConnection.getResponseCode(); |
| } else { |
| socket = mNetworkAgentInfo.network.getSocketFactory().createSocket(); |
| socket.setSoTimeout(SOCKET_TIMEOUT_MS); |
| // Lookup addresses only on this Network. |
| InetAddress[] hostAddresses = mNetworkAgentInfo.network.getAllByName(url.getHost()); |
| // Try all addresses. |
| for (int i = 0; i < hostAddresses.length; i++) { |
| if (DBG) log("Connecting to " + hostAddresses[i]); |
| try { |
| socket.connect(new InetSocketAddress(hostAddresses[i], |
| url.getDefaultPort()), SOCKET_TIMEOUT_MS); |
| break; |
| } catch (IOException e) { |
| // Ignore exceptions on all but the last. |
| if (i == (hostAddresses.length - 1)) throw e; |
| } |
| } |
| if (DBG) log("Requesting " + url.getFile()); |
| BufferedReader reader = new BufferedReader( |
| new InputStreamReader(socket.getInputStream())); |
| OutputStreamWriter writer = new OutputStreamWriter(socket.getOutputStream()); |
| writer.write("GET " + url.getFile() + " HTTP/1.1\r\nHost: " + url.getHost() + |
| "\r\nConnection: close\r\n\r\n"); |
| writer.flush(); |
| String response = reader.readLine(); |
| if (DBG) log("Received \"" + response + "\""); |
| if (response != null && (response.startsWith("HTTP/1.1 ") || |
| // 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. |
| response.startsWith("HTTP/1.0 "))) { |
| // NOTE: We may want to consider an "200" response with "Content-length=0" to |
| // not be a captive portal. This could be the result of an HTTP proxy server. |
| // See b/9972012. |
| httpResponseCode = Integer.parseInt(response.substring(9, 12)); |
| } else { |
| // A response was received but not understood. The fact that a |
| // response was sent indicates there's some kind of responsive network |
| // out there so put up the notification to the user to log into the network |
| // so the user can have the final say as to whether the network is useful. |
| httpResponseCode = 399; |
| while (DBG && response != null && !response.isEmpty()) { |
| try { |
| response = reader.readLine(); |
| } catch (IOException e) { |
| break; |
| } |
| log("Received \"" + response + "\""); |
| } |
| } |
| } |
| if (DBG) log("isCaptivePortal: ret=" + httpResponseCode); |
| } 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(); |
| } |
| if (socket != null) { |
| try { |
| socket.close(); |
| } catch (IOException e) { |
| // Ignore |
| } |
| } |
| } |
| return httpResponseCode; |
| } |
| } |