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 17 package com.android.captiveportallogin; 18 19 import android.app.Activity; 20 import android.app.LoadedApk; 21 import android.content.Context; 22 import android.content.Intent; 23 import android.graphics.Bitmap; 24 import android.net.ConnectivityManager; 25 import android.net.ConnectivityManager.NetworkCallback; 26 import android.net.Network; 27 import android.net.NetworkCapabilities; 28 import android.net.NetworkRequest; 29 import android.net.Proxy; 30 import android.net.Uri; 31 import android.net.http.SslError; 32 import android.os.Bundle; 33 import android.provider.Settings; 34 import android.provider.Settings.Global; 35 import android.util.ArrayMap; 36 import android.util.Log; 37 import android.view.Menu; 38 import android.view.MenuItem; 39 import android.view.View; 40 import android.view.Window; 41 import android.webkit.SslErrorHandler; 42 import android.webkit.WebChromeClient; 43 import android.webkit.WebSettings; 44 import android.webkit.WebView; 45 import android.webkit.WebViewClient; 46 import android.widget.ProgressBar; 47 48 import java.io.IOException; 49 import java.net.HttpURLConnection; 50 import java.net.MalformedURLException; 51 import java.net.URL; 52 import java.lang.InterruptedException; 53 import java.lang.reflect.Field; 54 import java.lang.reflect.Method; 55 56 public class CaptivePortalLoginActivity extends Activity { 57 private static final String TAG = "CaptivePortalLogin"; 58 private static final String DEFAULT_SERVER = "connectivitycheck.android.com"; 59 private static final int SOCKET_TIMEOUT_MS = 10000; 60 61 // Keep this in sync with NetworkMonitor. 62 // Intent broadcast to ConnectivityService indicating sign-in is complete. 63 // Extras: 64 // EXTRA_TEXT = netId 65 // LOGGED_IN_RESULT = one of the CAPTIVE_PORTAL_APP_RETURN_* values below. 66 // RESPONSE_TOKEN = data fragment from launching Intent 67 private static final String ACTION_CAPTIVE_PORTAL_LOGGED_IN = 68 "android.net.netmon.captive_portal_logged_in"; 69 private static final String LOGGED_IN_RESULT = "result"; 70 private static final int CAPTIVE_PORTAL_APP_RETURN_APPEASED = 0; 71 private static final int CAPTIVE_PORTAL_APP_RETURN_UNWANTED = 1; 72 private static final int CAPTIVE_PORTAL_APP_RETURN_WANTED_AS_IS = 2; 73 private static final String RESPONSE_TOKEN = "response_token"; 74 75 private URL mURL; 76 private int mNetId; 77 private String mResponseToken; 78 private NetworkCallback mNetworkCallback; 79 80 @Override onCreate(Bundle savedInstanceState)81 protected void onCreate(Bundle savedInstanceState) { 82 super.onCreate(savedInstanceState); 83 84 String server = Settings.Global.getString(getContentResolver(), "captive_portal_server"); 85 if (server == null) server = DEFAULT_SERVER; 86 try { 87 mURL = new URL("http", server, "/generate_204"); 88 final Uri dataUri = getIntent().getData(); 89 if (!dataUri.getScheme().equals("netid")) { 90 throw new MalformedURLException(); 91 } 92 mNetId = Integer.parseInt(dataUri.getSchemeSpecificPart()); 93 mResponseToken = dataUri.getFragment(); 94 } catch (MalformedURLException|NumberFormatException e) { 95 // System misconfigured, bail out in a way that at least provides network access. 96 done(CAPTIVE_PORTAL_APP_RETURN_WANTED_AS_IS); 97 } 98 99 final ConnectivityManager cm = ConnectivityManager.from(this); 100 final Network network = new Network(mNetId); 101 // Also initializes proxy system properties. 102 cm.setProcessDefaultNetwork(network); 103 104 // Proxy system properties must be initialized before setContentView is called because 105 // setContentView initializes the WebView logic which in turn reads the system properties. 106 setContentView(R.layout.activity_captive_portal_login); 107 108 getActionBar().setDisplayShowHomeEnabled(false); 109 110 // Exit app if Network disappears. 111 final NetworkCapabilities networkCapabilities = cm.getNetworkCapabilities(network); 112 if (networkCapabilities == null) { 113 finish(); 114 return; 115 } 116 mNetworkCallback = new NetworkCallback() { 117 @Override 118 public void onLost(Network lostNetwork) { 119 if (network.equals(lostNetwork)) done(CAPTIVE_PORTAL_APP_RETURN_UNWANTED); 120 } 121 }; 122 final NetworkRequest.Builder builder = new NetworkRequest.Builder(); 123 for (int transportType : networkCapabilities.getTransportTypes()) { 124 builder.addTransportType(transportType); 125 } 126 cm.registerNetworkCallback(builder.build(), mNetworkCallback); 127 128 final WebView myWebView = (WebView) findViewById(R.id.webview); 129 myWebView.clearCache(true); 130 WebSettings webSettings = myWebView.getSettings(); 131 webSettings.setJavaScriptEnabled(true); 132 myWebView.setWebViewClient(new MyWebViewClient()); 133 myWebView.setWebChromeClient(new MyWebChromeClient()); 134 // Start initial page load so WebView finishes loading proxy settings. 135 // Actual load of mUrl is initiated by MyWebViewClient. 136 myWebView.loadData("", "text/html", null); 137 } 138 139 // Find WebView's proxy BroadcastReceiver and prompt it to read proxy system properties. setWebViewProxy()140 private void setWebViewProxy() { 141 LoadedApk loadedApk = getApplication().mLoadedApk; 142 try { 143 Field receiversField = LoadedApk.class.getDeclaredField("mReceivers"); 144 receiversField.setAccessible(true); 145 ArrayMap receivers = (ArrayMap) receiversField.get(loadedApk); 146 for (Object receiverMap : receivers.values()) { 147 for (Object rec : ((ArrayMap) receiverMap).keySet()) { 148 Class clazz = rec.getClass(); 149 if (clazz.getName().contains("ProxyChangeListener")) { 150 Method onReceiveMethod = clazz.getDeclaredMethod("onReceive", Context.class, 151 Intent.class); 152 Intent intent = new Intent(Proxy.PROXY_CHANGE_ACTION); 153 onReceiveMethod.invoke(rec, getApplicationContext(), intent); 154 Log.v(TAG, "Prompting WebView proxy reload."); 155 } 156 } 157 } 158 } catch (Exception e) { 159 Log.e(TAG, "Exception while setting WebView proxy: " + e); 160 } 161 } 162 done(int result)163 private void done(int result) { 164 if (mNetworkCallback != null) { 165 ConnectivityManager.from(this).unregisterNetworkCallback(mNetworkCallback); 166 } 167 Intent intent = new Intent(ACTION_CAPTIVE_PORTAL_LOGGED_IN); 168 intent.putExtra(Intent.EXTRA_TEXT, String.valueOf(mNetId)); 169 intent.putExtra(LOGGED_IN_RESULT, String.valueOf(result)); 170 intent.putExtra(RESPONSE_TOKEN, mResponseToken); 171 sendBroadcast(intent); 172 finish(); 173 } 174 175 @Override onCreateOptionsMenu(Menu menu)176 public boolean onCreateOptionsMenu(Menu menu) { 177 getMenuInflater().inflate(R.menu.captive_portal_login, menu); 178 return true; 179 } 180 181 @Override onBackPressed()182 public void onBackPressed() { 183 WebView myWebView = (WebView) findViewById(R.id.webview); 184 if (myWebView.canGoBack()) { 185 myWebView.goBack(); 186 } else { 187 super.onBackPressed(); 188 } 189 } 190 191 @Override onOptionsItemSelected(MenuItem item)192 public boolean onOptionsItemSelected(MenuItem item) { 193 int id = item.getItemId(); 194 if (id == R.id.action_use_network) { 195 done(CAPTIVE_PORTAL_APP_RETURN_WANTED_AS_IS); 196 return true; 197 } 198 if (id == R.id.action_do_not_use_network) { 199 done(CAPTIVE_PORTAL_APP_RETURN_UNWANTED); 200 return true; 201 } 202 return super.onOptionsItemSelected(item); 203 } 204 testForCaptivePortal()205 private void testForCaptivePortal() { 206 new Thread(new Runnable() { 207 public void run() { 208 // Give time for captive portal to open. 209 try { 210 Thread.sleep(1000); 211 } catch (InterruptedException e) { 212 } 213 HttpURLConnection urlConnection = null; 214 int httpResponseCode = 500; 215 try { 216 urlConnection = (HttpURLConnection) mURL.openConnection(); 217 urlConnection.setInstanceFollowRedirects(false); 218 urlConnection.setConnectTimeout(SOCKET_TIMEOUT_MS); 219 urlConnection.setReadTimeout(SOCKET_TIMEOUT_MS); 220 urlConnection.setUseCaches(false); 221 urlConnection.getInputStream(); 222 httpResponseCode = urlConnection.getResponseCode(); 223 } catch (IOException e) { 224 } finally { 225 if (urlConnection != null) urlConnection.disconnect(); 226 } 227 if (httpResponseCode == 204) { 228 done(CAPTIVE_PORTAL_APP_RETURN_APPEASED); 229 } 230 } 231 }).start(); 232 } 233 234 private class MyWebViewClient extends WebViewClient { 235 private boolean firstPageLoad = true; 236 237 @Override onPageStarted(WebView view, String url, Bitmap favicon)238 public void onPageStarted(WebView view, String url, Bitmap favicon) { 239 if (firstPageLoad) return; 240 testForCaptivePortal(); 241 } 242 243 @Override onPageFinished(WebView view, String url)244 public void onPageFinished(WebView view, String url) { 245 if (firstPageLoad) { 246 firstPageLoad = false; 247 // Now that WebView has loaded at least one page we know it has read in the proxy 248 // settings. Now prompt the WebView read the Network-specific proxy settings. 249 setWebViewProxy(); 250 // Load the real page. 251 view.loadUrl(mURL.toString()); 252 return; 253 } 254 testForCaptivePortal(); 255 } 256 257 // A web page consisting of a large broken lock icon to indicate SSL failure. 258 final static String SSL_ERROR_HTML = "<!DOCTYPE html><html><head><style>" + 259 "html { width:100%; height:100%; " + 260 " background:url(locked_page.png) center center no-repeat; }" + 261 "</style></head><body></body></html>"; 262 263 @Override onReceivedSslError(WebView view, SslErrorHandler handler, SslError error)264 public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error) { 265 Log.w(TAG, "SSL error; displaying broken lock icon."); 266 view.loadDataWithBaseURL("file:///android_asset/", SSL_ERROR_HTML, "text/HTML", 267 "UTF-8", null); 268 } 269 } 270 271 private class MyWebChromeClient extends WebChromeClient { 272 @Override onProgressChanged(WebView view, int newProgress)273 public void onProgressChanged(WebView view, int newProgress) { 274 ProgressBar myProgressBar = (ProgressBar) findViewById(R.id.progress_bar); 275 myProgressBar.setProgress(newProgress); 276 myProgressBar.setVisibility(newProgress == 100 ? View.GONE : View.VISIBLE); 277 } 278 } 279 } 280