MobileDataStateTracker.java revision f013e1afd1e68af5e3b868c26a653bbfb39538f8
1/* 2 * Copyright (C) 2008 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.net; 18 19import android.content.BroadcastReceiver; 20import android.content.Context; 21import android.content.Intent; 22import android.content.IntentFilter; 23import android.os.RemoteException; 24import android.os.Handler; 25import android.os.ServiceManager; 26import android.os.SystemProperties; 27import com.android.internal.telephony.ITelephony; 28import com.android.internal.telephony.Phone; 29import com.android.internal.telephony.TelephonyIntents; 30import android.net.NetworkInfo.DetailedState; 31import android.telephony.TelephonyManager; 32import android.util.Log; 33import android.text.TextUtils; 34 35import java.util.List; 36import java.util.ArrayList; 37 38/** 39 * Track the state of mobile data connectivity. This is done by 40 * receiving broadcast intents from the Phone process whenever 41 * the state of data connectivity changes. 42 * 43 * {@hide} 44 */ 45public class MobileDataStateTracker extends NetworkStateTracker { 46 47 private static final String TAG = "MobileDataStateTracker"; 48 private static final boolean DBG = false; 49 50 private Phone.DataState mMobileDataState; 51 private ITelephony mPhoneService; 52 private static final String[] sDnsPropNames = { 53 "net.rmnet0.dns1", 54 "net.rmnet0.dns2", 55 "net.eth0.dns1", 56 "net.eth0.dns2", 57 "net.eth0.dns3", 58 "net.eth0.dns4", 59 "net.gprs.dns1", 60 "net.gprs.dns2" 61 }; 62 private List<String> mDnsServers; 63 private String mInterfaceName; 64 private int mDefaultGatewayAddr; 65 private int mLastCallingPid = -1; 66 67 /** 68 * Create a new MobileDataStateTracker 69 * @param context the application context of the caller 70 * @param target a message handler for getting callbacks about state changes 71 */ 72 public MobileDataStateTracker(Context context, Handler target) { 73 super(context, target, ConnectivityManager.TYPE_MOBILE, 74 TelephonyManager.getDefault().getNetworkType(), "MOBILE", 75 TelephonyManager.getDefault().getNetworkTypeName()); 76 mPhoneService = null; 77 mDnsServers = new ArrayList<String>(); 78 } 79 80 /** 81 * Begin monitoring mobile data connectivity. 82 */ 83 public void startMonitoring() { 84 IntentFilter filter = 85 new IntentFilter(TelephonyIntents.ACTION_ANY_DATA_CONNECTION_STATE_CHANGED); 86 filter.addAction(TelephonyIntents.ACTION_DATA_CONNECTION_FAILED); 87 filter.addAction(TelephonyIntents.ACTION_SERVICE_STATE_CHANGED); 88 89 Intent intent = mContext.registerReceiver(new MobileDataStateReceiver(), filter); 90 if (intent != null) 91 mMobileDataState = getMobileDataState(intent); 92 else 93 mMobileDataState = Phone.DataState.DISCONNECTED; 94 } 95 96 private static Phone.DataState getMobileDataState(Intent intent) { 97 String str = intent.getStringExtra(Phone.STATE_KEY); 98 if (str != null) 99 return Enum.valueOf(Phone.DataState.class, str); 100 else 101 return Phone.DataState.DISCONNECTED; 102 } 103 104 private class MobileDataStateReceiver extends BroadcastReceiver { 105 public void onReceive(Context context, Intent intent) { 106 if (intent.getAction().equals(TelephonyIntents.ACTION_ANY_DATA_CONNECTION_STATE_CHANGED)) { 107 Phone.DataState state = getMobileDataState(intent); 108 String reason = intent.getStringExtra(Phone.STATE_CHANGE_REASON_KEY); 109 String apnName = intent.getStringExtra(Phone.DATA_APN_KEY); 110 boolean unavailable = intent.getBooleanExtra(Phone.NETWORK_UNAVAILABLE_KEY, false); 111 if (DBG) Log.d(TAG, "Received " + intent.getAction() + 112 " broadcast - state = " + state 113 + ", unavailable = " + unavailable 114 + ", reason = " + (reason == null ? "(unspecified)" : reason)); 115 mNetworkInfo.setIsAvailable(!unavailable); 116 if (mMobileDataState != state) { 117 mMobileDataState = state; 118 119 switch (state) { 120 case DISCONNECTED: 121 setDetailedState(DetailedState.DISCONNECTED, reason, apnName); 122 if (mInterfaceName != null) { 123 NetworkUtils.resetConnections(mInterfaceName); 124 } 125 mInterfaceName = null; 126 mDefaultGatewayAddr = 0; 127 break; 128 case CONNECTING: 129 setDetailedState(DetailedState.CONNECTING, reason, apnName); 130 break; 131 case SUSPENDED: 132 setDetailedState(DetailedState.SUSPENDED, reason, apnName); 133 break; 134 case CONNECTED: 135 mInterfaceName = intent.getStringExtra(Phone.DATA_IFACE_NAME_KEY); 136 if (mInterfaceName == null) { 137 Log.d(TAG, "CONNECTED event did not supply interface name."); 138 } 139 setupDnsProperties(); 140 setDetailedState(DetailedState.CONNECTED, reason, apnName); 141 break; 142 } 143 } 144 } else if (intent.getAction().equals(TelephonyIntents.ACTION_DATA_CONNECTION_FAILED)) { 145 String reason = intent.getStringExtra(Phone.FAILURE_REASON_KEY); 146 String apnName = intent.getStringExtra(Phone.DATA_APN_KEY); 147 if (DBG) Log.d(TAG, "Received " + intent.getAction() + " broadcast" + 148 reason == null ? "" : "(" + reason + ")"); 149 setDetailedState(DetailedState.FAILED, reason, apnName); 150 } 151 TelephonyManager tm = TelephonyManager.getDefault(); 152 setRoamingStatus(tm.isNetworkRoaming()); 153 setSubtype(tm.getNetworkType(), tm.getNetworkTypeName()); 154 } 155 } 156 157 /** 158 * Make sure that route(s) exist to the carrier DNS server(s). 159 */ 160 public void addPrivateRoutes() { 161 if (mInterfaceName != null) { 162 for (String addrString : mDnsServers) { 163 int addr = NetworkUtils.lookupHost(addrString); 164 if (addr != -1) { 165 NetworkUtils.addHostRoute(mInterfaceName, addr); 166 } 167 } 168 } 169 } 170 171 public void removePrivateRoutes() { 172 if(mInterfaceName != null) { 173 NetworkUtils.removeHostRoutes(mInterfaceName); 174 } 175 } 176 177 public void removeDefaultRoute() { 178 if(mInterfaceName != null) { 179 mDefaultGatewayAddr = NetworkUtils.getDefaultRoute(mInterfaceName); 180 NetworkUtils.removeDefaultRoute(mInterfaceName); 181 } 182 } 183 184 public void restoreDefaultRoute() { 185 // 0 is not a valid address for a gateway 186 if (mInterfaceName != null && mDefaultGatewayAddr != 0) { 187 NetworkUtils.setDefaultRoute(mInterfaceName, mDefaultGatewayAddr); 188 } 189 } 190 191 private void getPhoneService(boolean forceRefresh) { 192 if ((mPhoneService == null) || forceRefresh) { 193 mPhoneService = ITelephony.Stub.asInterface(ServiceManager.getService("phone")); 194 } 195 } 196 197 /** 198 * Report whether data connectivity is possible. 199 */ 200 public boolean isAvailable() { 201 getPhoneService(false); 202 203 /* 204 * If the phone process has crashed in the past, we'll get a 205 * RemoteException and need to re-reference the service. 206 */ 207 for (int retry = 0; retry < 2; retry++) { 208 if (mPhoneService == null) break; 209 210 try { 211 return mPhoneService.isDataConnectivityPossible(); 212 } catch (RemoteException e) { 213 // First-time failed, get the phone service again 214 if (retry == 0) getPhoneService(true); 215 } 216 } 217 218 return false; 219 } 220 221 /** 222 * Return the IP addresses of the DNS servers available for the mobile data 223 * network interface. 224 * @return a list of DNS addresses, with no holes. 225 */ 226 public String[] getNameServers() { 227 return getNameServerList(sDnsPropNames); 228 } 229 230 /** 231 * {@inheritDoc} 232 * The mobile data network subtype indicates what generation network technology is in effect, 233 * e.g., GPRS, EDGE, UMTS, etc. 234 */ 235 public int getNetworkSubtype() { 236 return TelephonyManager.getDefault().getNetworkType(); 237 } 238 239 /** 240 * Return the system properties name associated with the tcp buffer sizes 241 * for this network. 242 */ 243 public String getTcpBufferSizesPropName() { 244 String networkTypeStr = "unknown"; 245 TelephonyManager tm = new TelephonyManager(mContext); 246 switch(tm.getNetworkType()) { 247 case TelephonyManager.NETWORK_TYPE_GPRS: 248 networkTypeStr = "gprs"; 249 break; 250 case TelephonyManager.NETWORK_TYPE_EDGE: 251 networkTypeStr = "edge"; 252 break; 253 case TelephonyManager.NETWORK_TYPE_UMTS: 254 networkTypeStr = "umts"; 255 break; 256 } 257 return "net.tcp.buffersize." + networkTypeStr; 258 } 259 260 /** 261 * Tear down mobile data connectivity, i.e., disable the ability to create 262 * mobile data connections. 263 */ 264 @Override 265 public boolean teardown() { 266 getPhoneService(false); 267 /* 268 * If the phone process has crashed in the past, we'll get a 269 * RemoteException and need to re-reference the service. 270 */ 271 for (int retry = 0; retry < 2; retry++) { 272 if (mPhoneService == null) { 273 Log.w(TAG, 274 "Ignoring mobile data teardown request because could not acquire PhoneService"); 275 break; 276 } 277 278 try { 279 return mPhoneService.disableDataConnectivity(); 280 } catch (RemoteException e) { 281 if (retry == 0) getPhoneService(true); 282 } 283 } 284 285 Log.w(TAG, "Failed to tear down mobile data connectivity"); 286 return false; 287 } 288 289 /** 290 * Re-enable mobile data connectivity after a {@link #teardown()}. 291 */ 292 public boolean reconnect() { 293 getPhoneService(false); 294 /* 295 * If the phone process has crashed in the past, we'll get a 296 * RemoteException and need to re-reference the service. 297 */ 298 for (int retry = 0; retry < 2; retry++) { 299 if (mPhoneService == null) { 300 Log.w(TAG, 301 "Ignoring mobile data connect request because could not acquire PhoneService"); 302 break; 303 } 304 305 try { 306 return mPhoneService.enableDataConnectivity(); 307 } catch (RemoteException e) { 308 if (retry == 0) getPhoneService(true); 309 } 310 } 311 312 Log.w(TAG, "Failed to set up mobile data connectivity"); 313 return false; 314 } 315 316 /** 317 * Turn on or off the mobile radio. No connectivity will be possible while the 318 * radio is off. The operation is a no-op if the radio is already in the desired state. 319 * @param turnOn {@code true} if the radio should be turned on, {@code false} if 320 */ 321 public boolean setRadio(boolean turnOn) { 322 getPhoneService(false); 323 /* 324 * If the phone process has crashed in the past, we'll get a 325 * RemoteException and need to re-reference the service. 326 */ 327 for (int retry = 0; retry < 2; retry++) { 328 if (mPhoneService == null) { 329 Log.w(TAG, 330 "Ignoring mobile radio request because could not acquire PhoneService"); 331 break; 332 } 333 334 try { 335 return mPhoneService.setRadio(turnOn); 336 } catch (RemoteException e) { 337 if (retry == 0) getPhoneService(true); 338 } 339 } 340 341 Log.w(TAG, "Could not set radio power to " + (turnOn ? "on" : "off")); 342 return false; 343 } 344 345 /** 346 * Tells the phone sub-system that the caller wants to 347 * begin using the named feature. The only supported feature at 348 * this time is {@code Phone.FEATURE_ENABLE_MMS}, which allows an application 349 * to specify that it wants to send and/or receive MMS data. 350 * @param feature the name of the feature to be used 351 * @param callingPid the process ID of the process that is issuing this request 352 * @param callingUid the user ID of the process that is issuing this request 353 * @return an integer value representing the outcome of the request. 354 * The interpretation of this value is feature-specific. 355 * specific, except that the value {@code -1} 356 * always indicates failure. For {@code Phone.FEATURE_ENABLE_MMS}, 357 * the other possible return values are 358 * <ul> 359 * <li>{@code Phone.APN_ALREADY_ACTIVE}</li> 360 * <li>{@code Phone.APN_REQUEST_STARTED}</li> 361 * <li>{@code Phone.APN_TYPE_NOT_AVAILABLE}</li> 362 * <li>{@code Phone.APN_REQUEST_FAILED}</li> 363 * </ul> 364 */ 365 public int startUsingNetworkFeature(String feature, int callingPid, int callingUid) { 366 if (TextUtils.equals(feature, Phone.FEATURE_ENABLE_MMS)) { 367 mLastCallingPid = callingPid; 368 return setEnableApn(Phone.APN_TYPE_MMS, true); 369 } else { 370 return -1; 371 } 372 } 373 374 /** 375 * Tells the phone sub-system that the caller is finished 376 * using the named feature. The only supported feature at 377 * this time is {@code Phone.FEATURE_ENABLE_MMS}, which allows an application 378 * to specify that it wants to send and/or receive MMS data. 379 * @param feature the name of the feature that is no longer needed 380 * @param callingPid the process ID of the process that is issuing this request 381 * @param callingUid the user ID of the process that is issuing this request 382 * @return an integer value representing the outcome of the request. 383 * The interpretation of this value is feature-specific, except that 384 * the value {@code -1} always indicates failure. 385 */ 386 public int stopUsingNetworkFeature(String feature, int callingPid, int callingUid) { 387 if (TextUtils.equals(feature, Phone.FEATURE_ENABLE_MMS)) { 388 return setEnableApn(Phone.APN_TYPE_MMS, false); 389 } else { 390 return -1; 391 } 392 } 393 394 /** 395 * Ensure that a network route exists to deliver traffic to the specified 396 * host via the mobile data network. 397 * @param hostAddress the IP address of the host to which the route is desired, 398 * in network byte order. 399 * @return {@code true} on success, {@code false} on failure 400 */ 401 @Override 402 public boolean requestRouteToHost(int hostAddress) { 403 if (mInterfaceName != null && hostAddress != -1) { 404 if (DBG) { 405 Log.d(TAG, "Requested host route to " + Integer.toHexString(hostAddress)); 406 } 407 return NetworkUtils.addHostRoute(mInterfaceName, hostAddress) == 0; 408 } else { 409 return false; 410 } 411 } 412 413 @Override 414 public String toString() { 415 StringBuffer sb = new StringBuffer("Mobile data state: "); 416 417 sb.append(mMobileDataState); 418 return sb.toString(); 419 } 420 421 private void setupDnsProperties() { 422 mDnsServers.clear(); 423 // Set up per-process DNS server list on behalf of the MMS process 424 int i = 1; 425 if (mInterfaceName != null) { 426 for (String propName : sDnsPropNames) { 427 if (propName.indexOf(mInterfaceName) != -1) { 428 String propVal = SystemProperties.get(propName); 429 if (propVal != null && propVal.length() != 0 && !propVal.equals("0.0.0.0")) { 430 mDnsServers.add(propVal); 431 if (mLastCallingPid != -1) { 432 SystemProperties.set("net.dns" + i + "." + mLastCallingPid, propVal); 433 } 434 ++i; 435 } 436 } 437 } 438 } 439 if (i == 1) { 440 Log.d(TAG, "DNS server addresses are not known."); 441 } else if (mLastCallingPid != -1) { 442 /* 443 * Bump the property that tells the name resolver library 444 * to reread the DNS server list from the properties. 445 */ 446 String propVal = SystemProperties.get("net.dnschange"); 447 if (propVal.length() != 0) { 448 try { 449 int n = Integer.parseInt(propVal); 450 SystemProperties.set("net.dnschange", "" + (n+1)); 451 } catch (NumberFormatException e) { 452 } 453 } 454 } 455 mLastCallingPid = -1; 456 } 457 458 /** 459 * Internal method supporting the ENABLE_MMS feature. 460 * @param apnType the type of APN to be enabled or disabled (e.g., mms) 461 * @param enable {@code true} to enable the specified APN type, 462 * {@code false} to disable it. 463 * @return an integer value representing the outcome of the request. 464 */ 465 private int setEnableApn(String apnType, boolean enable) { 466 getPhoneService(false); 467 /* 468 * If the phone process has crashed in the past, we'll get a 469 * RemoteException and need to re-reference the service. 470 */ 471 for (int retry = 0; retry < 2; retry++) { 472 if (mPhoneService == null) { 473 Log.w(TAG, 474 "Ignoring feature request because could not acquire PhoneService"); 475 break; 476 } 477 478 try { 479 if (enable) { 480 return mPhoneService.enableApnType(apnType); 481 } else { 482 return mPhoneService.disableApnType(apnType); 483 } 484 } catch (RemoteException e) { 485 if (retry == 0) getPhoneService(true); 486 } 487 } 488 489 Log.w(TAG, "Could not " + (enable ? "enable" : "disable") 490 + " APN type \"" + apnType + "\""); 491 return Phone.APN_REQUEST_FAILED; 492 } 493} 494