ConnectivityService.java revision b8f16340b531809aa08cb73c55ddadd5f94de080
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 com.android.server; 18 19import android.app.Notification; 20import android.app.NotificationManager; 21import android.content.ContentResolver; 22import android.content.Context; 23import android.content.Intent; 24import android.content.pm.PackageManager; 25import android.net.ConnectivityManager; 26import android.net.IConnectivityManager; 27import android.net.MobileDataStateTracker; 28import android.net.NetworkInfo; 29import android.net.NetworkStateTracker; 30import android.net.wifi.WifiStateTracker; 31import android.os.Binder; 32import android.os.Handler; 33import android.os.IBinder; 34import android.os.Looper; 35import android.os.Message; 36import android.os.RemoteException; 37import android.os.ServiceManager; 38import android.os.SystemProperties; 39import android.provider.Settings; 40import android.text.TextUtils; 41import android.util.EventLog; 42import android.util.Log; 43 44import com.android.internal.telephony.Phone; 45 46import java.io.FileDescriptor; 47import java.io.PrintWriter; 48import java.util.ArrayList; 49import java.util.List; 50 51/** 52 * @hide 53 */ 54public class ConnectivityService extends IConnectivityManager.Stub { 55 56 private static final boolean DBG = true; 57 private static final String TAG = "ConnectivityService"; 58 59 // Event log tags (must be in sync with event-log-tags) 60 private static final int EVENTLOG_CONNECTIVITY_STATE_CHANGED = 50020; 61 62 // how long to wait before switching back to a radio's default network 63 private static final int RESTORE_DEFAULT_NETWORK_DELAY = 1 * 60 * 1000; 64 // system property that can override the above value 65 private static final String NETWORK_RESTORE_DELAY_PROP_NAME = 66 "android.telephony.apn-restore"; 67 68 /** 69 * Sometimes we want to refer to the individual network state 70 * trackers separately, and sometimes we just want to treat them 71 * abstractly. 72 */ 73 private NetworkStateTracker mNetTrackers[]; 74 75 /** 76 * A per Net list of the PID's that requested access to the net 77 * used both as a refcount and for per-PID DNS selection 78 */ 79 private List mNetRequestersPids[]; 80 81 private WifiWatchdogService mWifiWatchdogService; 82 83 // priority order of the nettrackers 84 // (excluding dynamically set mNetworkPreference) 85 // TODO - move mNetworkTypePreference into this 86 private int[] mPriorityList; 87 88 private Context mContext; 89 private int mNetworkPreference; 90 private int mActiveDefaultNetwork = -1; 91 92 private int mNumDnsEntries; 93 94 private boolean mTestMode; 95 private static ConnectivityService sServiceInstance; 96 97 private Handler mHandler; 98 99 // list of DeathRecipients used to make sure features are turned off when 100 // a process dies 101 private List mFeatureUsers; 102 103 private boolean mSystemReady; 104 private ArrayList<Intent> mDeferredBroadcasts; 105 106 private class NetworkAttributes { 107 /** 108 * Class for holding settings read from resources. 109 */ 110 public String mName; 111 public int mType; 112 public int mRadio; 113 public int mPriority; 114 public NetworkAttributes(String init) { 115 String fragments[] = init.split(","); 116 mName = fragments[0].toLowerCase(); 117 if (fragments[1].toLowerCase().equals("wifi")) { 118 mRadio = ConnectivityManager.TYPE_WIFI; 119 } else { 120 mRadio = ConnectivityManager.TYPE_MOBILE; 121 } 122 if (mName.equals("default")) { 123 mType = mRadio; 124 } else if (mName.equals("mms")) { 125 mType = ConnectivityManager.TYPE_MOBILE_MMS; 126 } else if (mName.equals("supl")) { 127 mType = ConnectivityManager.TYPE_MOBILE_SUPL; 128 } else if (mName.equals("dun")) { 129 mType = ConnectivityManager.TYPE_MOBILE_DUN; 130 } else if (mName.equals("hipri")) { 131 mType = ConnectivityManager.TYPE_MOBILE_HIPRI; 132 } 133 mPriority = Integer.parseInt(fragments[2]); 134 } 135 public boolean isDefault() { 136 return (mType == mRadio); 137 } 138 } 139 NetworkAttributes[] mNetAttributes; 140 141 private class RadioAttributes { 142 public String mName; 143 public int mPriority; 144 public int mSimultaneity; 145 public int mType; 146 public RadioAttributes(String init) { 147 String fragments[] = init.split(","); 148 mName = fragments[0].toLowerCase(); 149 mPriority = Integer.parseInt(fragments[1]); 150 mSimultaneity = Integer.parseInt(fragments[2]); 151 if (mName.equals("wifi")) { 152 mType = ConnectivityManager.TYPE_WIFI; 153 } else { 154 mType = ConnectivityManager.TYPE_MOBILE; 155 } 156 } 157 } 158 RadioAttributes[] mRadioAttributes; 159 160 private static class ConnectivityThread extends Thread { 161 private Context mContext; 162 163 private ConnectivityThread(Context context) { 164 super("ConnectivityThread"); 165 mContext = context; 166 } 167 168 @Override 169 public void run() { 170 Looper.prepare(); 171 synchronized (this) { 172 sServiceInstance = new ConnectivityService(mContext); 173 notifyAll(); 174 } 175 Looper.loop(); 176 } 177 178 public static ConnectivityService getServiceInstance(Context context) { 179 ConnectivityThread thread = new ConnectivityThread(context); 180 thread.start(); 181 182 synchronized (thread) { 183 while (sServiceInstance == null) { 184 try { 185 // Wait until sServiceInstance has been initialized. 186 thread.wait(); 187 } catch (InterruptedException ignore) { 188 Log.e(TAG, 189 "Unexpected InterruptedException while waiting"+ 190 " for ConnectivityService thread"); 191 } 192 } 193 } 194 195 return sServiceInstance; 196 } 197 } 198 199 public static ConnectivityService getInstance(Context context) { 200 return ConnectivityThread.getServiceInstance(context); 201 } 202 203 private ConnectivityService(Context context) { 204 if (DBG) Log.v(TAG, "ConnectivityService starting up"); 205 mContext = context; 206 mNetTrackers = new NetworkStateTracker[ 207 ConnectivityManager.MAX_NETWORK_TYPE+1]; 208 mHandler = new MyHandler(); 209 210 mNetworkPreference = getPersistedNetworkPreference(); 211 212 // Load device network attributes from resources 213 mNetAttributes = new NetworkAttributes[ 214 ConnectivityManager.MAX_NETWORK_TYPE+1]; 215 mRadioAttributes = new RadioAttributes[ 216 ConnectivityManager.MAX_RADIO_TYPE+1]; 217 String[] naStrings = context.getResources().getStringArray( 218 com.android.internal.R.array.networkAttributes); 219 // TODO - what if the setting has gaps/unknown types? 220 for (String a : naStrings) { 221 NetworkAttributes n = new NetworkAttributes(a); 222 mNetAttributes[n.mType] = n; 223 } 224 String[] raStrings = context.getResources().getStringArray( 225 com.android.internal.R.array.radioAttributes); 226 for (String a : raStrings) { 227 RadioAttributes r = new RadioAttributes(a); 228 mRadioAttributes[r.mType] = r; 229 } 230 231 // high priority first 232 mPriorityList = new int[naStrings.length]; 233 { 234 int priority = 0; //lowest 235 int nextPos = naStrings.length-1; 236 while (nextPos>-1) { 237 for (int i = 0; i < mNetAttributes.length; i++) { 238 if(mNetAttributes[i].mPriority == priority) { 239 mPriorityList[nextPos--] = i; 240 } 241 } 242 priority++; 243 } 244 } 245 246 mNetRequestersPids = 247 new ArrayList[ConnectivityManager.MAX_NETWORK_TYPE+1]; 248 for (int i=0; i<=ConnectivityManager.MAX_NETWORK_TYPE; i++) { 249 mNetRequestersPids[i] = new ArrayList(); 250 } 251 252 mFeatureUsers = new ArrayList(); 253 254 /* 255 * Create the network state trackers for Wi-Fi and mobile 256 * data. Maybe this could be done with a factory class, 257 * but it's not clear that it's worth it, given that 258 * the number of different network types is not going 259 * to change very often. 260 */ 261 if (DBG) Log.v(TAG, "Starting Wifi Service."); 262 WifiStateTracker wst = new WifiStateTracker(context, mHandler); 263 WifiService wifiService = new WifiService(context, wst); 264 ServiceManager.addService(Context.WIFI_SERVICE, wifiService); 265 mNetTrackers[ConnectivityManager.TYPE_WIFI] = wst; 266 267 mNetTrackers[ConnectivityManager.TYPE_MOBILE] = 268 new MobileDataStateTracker(context, mHandler, 269 ConnectivityManager.TYPE_MOBILE, Phone.APN_TYPE_DEFAULT, 270 "MOBILE"); 271 272 mNetTrackers[ConnectivityManager.TYPE_MOBILE_MMS] = 273 new MobileDataStateTracker(context, mHandler, 274 ConnectivityManager.TYPE_MOBILE_MMS, Phone.APN_TYPE_MMS, 275 "MOBILE_MMS"); 276 277 mNetTrackers[ConnectivityManager.TYPE_MOBILE_SUPL] = 278 new MobileDataStateTracker(context, mHandler, 279 ConnectivityManager.TYPE_MOBILE_SUPL, Phone.APN_TYPE_SUPL, 280 "MOBILE_SUPL"); 281 282 mNetTrackers[ConnectivityManager.TYPE_MOBILE_DUN] = 283 new MobileDataStateTracker(context, mHandler, 284 ConnectivityManager.TYPE_MOBILE_DUN, Phone.APN_TYPE_DUN, 285 "MOBILE_DUN"); 286 287 mNetTrackers[ConnectivityManager.TYPE_MOBILE_HIPRI] = 288 new MobileDataStateTracker(context, mHandler, 289 ConnectivityManager.TYPE_MOBILE_HIPRI, Phone.APN_TYPE_HIPRI, 290 "MOBILE_HIPRI"); 291 292 mNumDnsEntries = 0; 293 294 mTestMode = SystemProperties.get("cm.test.mode").equals("true") 295 && SystemProperties.get("ro.build.type").equals("eng"); 296 297 for (NetworkStateTracker t : mNetTrackers) 298 t.startMonitoring(); 299 300 // Constructing this starts it too 301 mWifiWatchdogService = new WifiWatchdogService(context, wst); 302 } 303 304 /** 305 * Sets the preferred network. 306 * @param preference the new preference 307 */ 308 public synchronized void setNetworkPreference(int preference) { 309 enforceChangePermission(); 310 if (ConnectivityManager.isNetworkTypeValid(preference) && 311 mNetAttributes[preference].isDefault()) { 312 if (mNetworkPreference != preference) { 313 persistNetworkPreference(preference); 314 mNetworkPreference = preference; 315 enforcePreference(); 316 } 317 } 318 } 319 320 public int getNetworkPreference() { 321 enforceAccessPermission(); 322 return mNetworkPreference; 323 } 324 325 private void persistNetworkPreference(int networkPreference) { 326 final ContentResolver cr = mContext.getContentResolver(); 327 Settings.Secure.putInt(cr, Settings.Secure.NETWORK_PREFERENCE, 328 networkPreference); 329 } 330 331 private int getPersistedNetworkPreference() { 332 final ContentResolver cr = mContext.getContentResolver(); 333 334 final int networkPrefSetting = Settings.Secure 335 .getInt(cr, Settings.Secure.NETWORK_PREFERENCE, -1); 336 if (networkPrefSetting != -1) { 337 return networkPrefSetting; 338 } 339 340 return ConnectivityManager.DEFAULT_NETWORK_PREFERENCE; 341 } 342 343 /** 344 * Make the state of network connectivity conform to the preference settings 345 * In this method, we only tear down a non-preferred network. Establishing 346 * a connection to the preferred network is taken care of when we handle 347 * the disconnect event from the non-preferred network 348 * (see {@link #handleDisconnect(NetworkInfo)}). 349 */ 350 private void enforcePreference() { 351 if (mNetTrackers[mNetworkPreference].getNetworkInfo().isConnected()) 352 return; 353 354 if (!mNetTrackers[mNetworkPreference].isAvailable()) 355 return; 356 357 for (int t=0; t <= ConnectivityManager.MAX_RADIO_TYPE; t++) { 358 if (t != mNetworkPreference && 359 mNetTrackers[t].getNetworkInfo().isConnected()) { 360 if (DBG) { 361 Log.d(TAG, "tearing down " + 362 mNetTrackers[t].getNetworkInfo() + 363 " in enforcePreference"); 364 } 365 teardown(mNetTrackers[t]); 366 } 367 } 368 } 369 370 private boolean teardown(NetworkStateTracker netTracker) { 371 if (netTracker.teardown()) { 372 netTracker.setTeardownRequested(true); 373 return true; 374 } else { 375 return false; 376 } 377 } 378 379 /** 380 * Return NetworkInfo for the active (i.e., connected) network interface. 381 * It is assumed that at most one network is active at a time. If more 382 * than one is active, it is indeterminate which will be returned. 383 * @return the info for the active network, or {@code null} if none is 384 * active 385 */ 386 public NetworkInfo getActiveNetworkInfo() { 387 enforceAccessPermission(); 388 for (int type=0; type <= ConnectivityManager.MAX_NETWORK_TYPE; type++) { 389 if (!mNetAttributes[type].isDefault()) { 390 continue; 391 } 392 NetworkStateTracker t = mNetTrackers[type]; 393 NetworkInfo info = t.getNetworkInfo(); 394 if (info.isConnected()) { 395 if (DBG && type != mActiveDefaultNetwork) Log.e(TAG, 396 "connected default network is not " + 397 "mActiveDefaultNetwork!"); 398 return info; 399 } 400 } 401 return null; 402 } 403 404 public NetworkInfo getNetworkInfo(int networkType) { 405 enforceAccessPermission(); 406 if (ConnectivityManager.isNetworkTypeValid(networkType)) { 407 NetworkStateTracker t = mNetTrackers[networkType]; 408 if (t != null) 409 return t.getNetworkInfo(); 410 } 411 return null; 412 } 413 414 public NetworkInfo[] getAllNetworkInfo() { 415 enforceAccessPermission(); 416 NetworkInfo[] result = new NetworkInfo[mNetTrackers.length]; 417 int i = 0; 418 for (NetworkStateTracker t : mNetTrackers) { 419 result[i++] = t.getNetworkInfo(); 420 } 421 return result; 422 } 423 424 public boolean setRadios(boolean turnOn) { 425 boolean result = true; 426 enforceChangePermission(); 427 for (NetworkStateTracker t : mNetTrackers) { 428 result = t.setRadio(turnOn) && result; 429 } 430 return result; 431 } 432 433 public boolean setRadio(int netType, boolean turnOn) { 434 enforceChangePermission(); 435 if (!ConnectivityManager.isNetworkTypeValid(netType)) { 436 return false; 437 } 438 NetworkStateTracker tracker = mNetTrackers[netType]; 439 return tracker != null && tracker.setRadio(turnOn); 440 } 441 442 /** 443 * Used to notice when the calling process dies so we can self-expire 444 * 445 * Also used to know if the process has cleaned up after itself when 446 * our auto-expire timer goes off. The timer has a link to an object. 447 * 448 */ 449 private class FeatureUser implements IBinder.DeathRecipient { 450 int mNetworkType; 451 String mFeature; 452 IBinder mBinder; 453 int mPid; 454 int mUid; 455 456 FeatureUser(int type, String feature, IBinder binder) { 457 super(); 458 mNetworkType = type; 459 mFeature = feature; 460 mBinder = binder; 461 mPid = getCallingPid(); 462 mUid = getCallingUid(); 463 464 try { 465 mBinder.linkToDeath(this, 0); 466 } catch (RemoteException e) { 467 binderDied(); 468 } 469 } 470 471 void unlinkDeathRecipient() { 472 mBinder.unlinkToDeath(this, 0); 473 } 474 475 public void binderDied() { 476 Log.d(TAG, "ConnectivityService FeatureUser binderDied(" + 477 mNetworkType + ", " + mFeature + ", " + mBinder); 478 stopUsingNetworkFeature(this, false); 479 } 480 481 public void expire() { 482 Log.d(TAG, "ConnectivityService FeatureUser expire(" + 483 mNetworkType + ", " + mFeature + ", " + mBinder); 484 stopUsingNetworkFeature(this, false); 485 } 486 } 487 488 // javadoc from interface 489 public int startUsingNetworkFeature(int networkType, String feature, 490 IBinder binder) { 491 if (DBG) { 492 Log.d(TAG, "startUsingNetworkFeature for net " + networkType + 493 ": " + feature); 494 } 495 enforceChangePermission(); 496 if (!ConnectivityManager.isNetworkTypeValid(networkType)) { 497 return Phone.APN_REQUEST_FAILED; 498 } 499 500 FeatureUser f = new FeatureUser(networkType, feature, binder); 501 502 // TODO - move this into the MobileDataStateTracker 503 int usedNetworkType = networkType; 504 if(networkType == ConnectivityManager.TYPE_MOBILE) { 505 if (TextUtils.equals(feature, Phone.FEATURE_ENABLE_MMS)) { 506 usedNetworkType = ConnectivityManager.TYPE_MOBILE_MMS; 507 } else if (TextUtils.equals(feature, Phone.FEATURE_ENABLE_SUPL)) { 508 usedNetworkType = ConnectivityManager.TYPE_MOBILE_SUPL; 509 } else if (TextUtils.equals(feature, Phone.FEATURE_ENABLE_DUN)) { 510 usedNetworkType = ConnectivityManager.TYPE_MOBILE_DUN; 511 } else if (TextUtils.equals(feature, Phone.FEATURE_ENABLE_HIPRI)) { 512 usedNetworkType = ConnectivityManager.TYPE_MOBILE_HIPRI; 513 } 514 } 515 NetworkStateTracker network = mNetTrackers[usedNetworkType]; 516 if (network != null) { 517 if (usedNetworkType != networkType) { 518 Integer currentPid = new Integer(getCallingPid()); 519 520 NetworkStateTracker radio = mNetTrackers[networkType]; 521 NetworkInfo ni = network.getNetworkInfo(); 522 523 if (ni.isAvailable() == false) { 524 if (DBG) Log.d(TAG, "special network not available"); 525 return Phone.APN_TYPE_NOT_AVAILABLE; 526 } 527 528 synchronized(this) { 529 mFeatureUsers.add(f); 530 if (!mNetRequestersPids[usedNetworkType].contains(currentPid)) { 531 // this gets used for per-pid dns when connected 532 mNetRequestersPids[usedNetworkType].add(currentPid); 533 } 534 } 535 mHandler.sendMessageDelayed(mHandler.obtainMessage( 536 NetworkStateTracker.EVENT_RESTORE_DEFAULT_NETWORK, 537 f), getRestoreDefaultNetworkDelay()); 538 539 540 if ((ni.isConnectedOrConnecting() == true) && 541 !network.isTeardownRequested()) { 542 if (ni.isConnected() == true) { 543 // add the pid-specific dns 544 handleDnsConfigurationChange(); 545 if (DBG) Log.d(TAG, "special network already active"); 546 return Phone.APN_ALREADY_ACTIVE; 547 } 548 if (DBG) Log.d(TAG, "special network already connecting"); 549 return Phone.APN_REQUEST_STARTED; 550 } 551 552 // check if the radio in play can make another contact 553 // assume if cannot for now 554 555 if (DBG) Log.d(TAG, "reconnecting to special network"); 556 network.reconnect(); 557 return Phone.APN_REQUEST_STARTED; 558 } else { 559 synchronized(this) { 560 mFeatureUsers.add(f); 561 } 562 mHandler.sendMessageDelayed(mHandler.obtainMessage( 563 NetworkStateTracker.EVENT_RESTORE_DEFAULT_NETWORK, 564 f), getRestoreDefaultNetworkDelay()); 565 566 return network.startUsingNetworkFeature(feature, 567 getCallingPid(), getCallingUid()); 568 } 569 } 570 return Phone.APN_TYPE_NOT_AVAILABLE; 571 } 572 573 // javadoc from interface 574 public int stopUsingNetworkFeature(int networkType, String feature) { 575 enforceChangePermission(); 576 577 int pid = getCallingPid(); 578 int uid = getCallingUid(); 579 580 FeatureUser u = null; 581 boolean found = false; 582 583 synchronized(this) { 584 for (int i = 0; i < mFeatureUsers.size() ; i++) { 585 u = (FeatureUser)mFeatureUsers.get(i); 586 if (uid == u.mUid && pid == u.mPid && 587 networkType == u.mNetworkType && 588 TextUtils.equals(feature, u.mFeature)) { 589 found = true; 590 break; 591 } 592 } 593 } 594 if (found && u != null) { 595 // stop regardless of how many other time this proc had called start 596 return stopUsingNetworkFeature(u, true); 597 } else { 598 // none found! 599 return 1; 600 } 601 } 602 603 private int stopUsingNetworkFeature(FeatureUser u, boolean ignoreDups) { 604 int networkType = u.mNetworkType; 605 String feature = u.mFeature; 606 int pid = u.mPid; 607 int uid = u.mUid; 608 609 NetworkStateTracker tracker = null; 610 boolean callTeardown = false; // used to carry our decision outside of sync block 611 612 if (DBG) { 613 Log.d(TAG, "stopUsingNetworkFeature for net " + networkType + 614 ": " + feature); 615 } 616 617 if (!ConnectivityManager.isNetworkTypeValid(networkType)) { 618 return -1; 619 } 620 621 // need to link the mFeatureUsers list with the mNetRequestersPids state in this 622 // sync block 623 synchronized(this) { 624 // check if this process still has an outstanding start request 625 if (!mFeatureUsers.contains(u)) { 626 return 1; 627 } 628 u.unlinkDeathRecipient(); 629 mFeatureUsers.remove(mFeatureUsers.indexOf(u)); 630 // If we care about duplicate requests, check for that here. 631 // 632 // This is done to support the extension of a request - the app 633 // can request we start the network feature again and renew the 634 // auto-shutoff delay. Normal "stop" calls from the app though 635 // do not pay attention to duplicate requests - in effect the 636 // API does not refcount and a single stop will counter multiple starts. 637 if (ignoreDups == false) { 638 for (int i = 0; i < mFeatureUsers.size() ; i++) { 639 FeatureUser x = (FeatureUser)mFeatureUsers.get(i); 640 if (x.mUid == u.mUid && x.mPid == u.mPid && 641 x.mNetworkType == u.mNetworkType && 642 TextUtils.equals(x.mFeature, u.mFeature)) { 643 return 1; 644 } 645 } 646 } 647 648 // TODO - move to MobileDataStateTracker 649 int usedNetworkType = networkType; 650 if (networkType == ConnectivityManager.TYPE_MOBILE) { 651 if (TextUtils.equals(feature, Phone.FEATURE_ENABLE_MMS)) { 652 usedNetworkType = ConnectivityManager.TYPE_MOBILE_MMS; 653 } else if (TextUtils.equals(feature, Phone.FEATURE_ENABLE_SUPL)) { 654 usedNetworkType = ConnectivityManager.TYPE_MOBILE_SUPL; 655 } else if (TextUtils.equals(feature, Phone.FEATURE_ENABLE_DUN)) { 656 usedNetworkType = ConnectivityManager.TYPE_MOBILE_DUN; 657 } else if (TextUtils.equals(feature, Phone.FEATURE_ENABLE_HIPRI)) { 658 usedNetworkType = ConnectivityManager.TYPE_MOBILE_HIPRI; 659 } 660 } 661 tracker = mNetTrackers[usedNetworkType]; 662 if(usedNetworkType != networkType) { 663 Integer currentPid = new Integer(pid); 664 reassessPidDns(pid, true); 665 mNetRequestersPids[usedNetworkType].remove(currentPid); 666 if (mNetRequestersPids[usedNetworkType].size() != 0) { 667 if (DBG) Log.d(TAG, "not tearing down special network - " + 668 "others still using it"); 669 return 1; 670 } 671 callTeardown = true; 672 } 673 } 674 675 if (callTeardown) { 676 tracker.teardown(); 677 return 1; 678 } else { 679 // do it the old fashioned way 680 return tracker.stopUsingNetworkFeature(feature, pid, uid); 681 } 682 } 683 684 /** 685 * Ensure that a network route exists to deliver traffic to the specified 686 * host via the specified network interface. 687 * @param networkType the type of the network over which traffic to the 688 * specified host is to be routed 689 * @param hostAddress the IP address of the host to which the route is 690 * desired 691 * @return {@code true} on success, {@code false} on failure 692 */ 693 public boolean requestRouteToHost(int networkType, int hostAddress) { 694 enforceChangePermission(); 695 if (!ConnectivityManager.isNetworkTypeValid(networkType)) { 696 return false; 697 } 698 NetworkStateTracker tracker = mNetTrackers[networkType]; 699 700 if (!tracker.getNetworkInfo().isConnected() || tracker.isTeardownRequested()) { 701 if (DBG) { 702 Log.d(TAG, "requestRouteToHost on down network (" + networkType + " - dropped"); 703 } 704 return false; 705 } 706 return tracker.requestRouteToHost(hostAddress); 707 } 708 709 /** 710 * @see ConnectivityManager#getBackgroundDataSetting() 711 */ 712 public boolean getBackgroundDataSetting() { 713 return Settings.Secure.getInt(mContext.getContentResolver(), 714 Settings.Secure.BACKGROUND_DATA, 1) == 1; 715 } 716 717 /** 718 * @see ConnectivityManager#setBackgroundDataSetting(boolean) 719 */ 720 public void setBackgroundDataSetting(boolean allowBackgroundDataUsage) { 721 mContext.enforceCallingOrSelfPermission( 722 android.Manifest.permission.CHANGE_BACKGROUND_DATA_SETTING, 723 "ConnectivityService"); 724 725 if (getBackgroundDataSetting() == allowBackgroundDataUsage) return; 726 727 Settings.Secure.putInt(mContext.getContentResolver(), 728 Settings.Secure.BACKGROUND_DATA, 729 allowBackgroundDataUsage ? 1 : 0); 730 731 Intent broadcast = new Intent( 732 ConnectivityManager.ACTION_BACKGROUND_DATA_SETTING_CHANGED); 733 mContext.sendBroadcast(broadcast); 734 } 735 736 private int getNumConnectedNetworks() { 737 int numConnectedNets = 0; 738 739 for (NetworkStateTracker nt : mNetTrackers) { 740 if (nt.getNetworkInfo().isConnected() && 741 !nt.isTeardownRequested()) { 742 ++numConnectedNets; 743 } 744 } 745 return numConnectedNets; 746 } 747 748 private void enforceAccessPermission() { 749 mContext.enforceCallingOrSelfPermission( 750 android.Manifest.permission.ACCESS_NETWORK_STATE, 751 "ConnectivityService"); 752 } 753 754 private void enforceChangePermission() { 755 mContext.enforceCallingOrSelfPermission( 756 android.Manifest.permission.CHANGE_NETWORK_STATE, 757 "ConnectivityService"); 758 } 759 760 /** 761 * Handle a {@code DISCONNECTED} event. If this pertains to the non-active 762 * network, we ignore it. If it is for the active network, we send out a 763 * broadcast. But first, we check whether it might be possible to connect 764 * to a different network. 765 * @param info the {@code NetworkInfo} for the network 766 */ 767 private void handleDisconnect(NetworkInfo info) { 768 769 int prevNetType = info.getType(); 770 771 mNetTrackers[prevNetType].setTeardownRequested(false); 772 /* 773 * If the disconnected network is not the active one, then don't report 774 * this as a loss of connectivity. What probably happened is that we're 775 * getting the disconnect for a network that we explicitly disabled 776 * in accordance with network preference policies. 777 */ 778 if (!mNetAttributes[prevNetType].isDefault()) { 779 List pids = mNetRequestersPids[prevNetType]; 780 for (int i = 0; i<pids.size(); i++) { 781 Integer pid = (Integer)pids.get(i); 782 // will remove them because the net's no longer connected 783 // need to do this now as only now do we know the pids and 784 // can properly null things that are no longer referenced. 785 reassessPidDns(pid.intValue(), false); 786 } 787 } 788 789 Intent intent = new Intent(ConnectivityManager.CONNECTIVITY_ACTION); 790 intent.putExtra(ConnectivityManager.EXTRA_NETWORK_INFO, info); 791 if (info.isFailover()) { 792 intent.putExtra(ConnectivityManager.EXTRA_IS_FAILOVER, true); 793 info.setFailover(false); 794 } 795 if (info.getReason() != null) { 796 intent.putExtra(ConnectivityManager.EXTRA_REASON, info.getReason()); 797 } 798 if (info.getExtraInfo() != null) { 799 intent.putExtra(ConnectivityManager.EXTRA_EXTRA_INFO, 800 info.getExtraInfo()); 801 } 802 803 /* 804 * If this is a default network, check if other defaults are available 805 * or active 806 */ 807 NetworkStateTracker newNet = null; 808 if (mNetAttributes[prevNetType].isDefault()) { 809 if (mActiveDefaultNetwork == prevNetType) { 810 mActiveDefaultNetwork = -1; 811 } 812 813 int newType = -1; 814 int newPriority = -1; 815 for (int checkType=0; checkType <= 816 ConnectivityManager.MAX_NETWORK_TYPE; checkType++) { 817 if (checkType == prevNetType) { 818 continue; 819 } 820 if (mNetAttributes[checkType].isDefault()) { 821 /* TODO - if we have multiple nets we could use 822 * we may want to put more thought into which we choose 823 */ 824 if (checkType == mNetworkPreference) { 825 newType = checkType; 826 break; 827 } 828 if (mRadioAttributes[mNetAttributes[checkType].mRadio]. 829 mPriority > newPriority) { 830 newType = checkType; 831 newPriority = mRadioAttributes[mNetAttributes[newType]. 832 mRadio].mPriority; 833 } 834 } 835 } 836 837 if (newType != -1) { 838 newNet = mNetTrackers[newType]; 839 /** 840 * See if the other network is available to fail over to. 841 * If is not available, we enable it anyway, so that it 842 * will be able to connect when it does become available, 843 * but we report a total loss of connectivity rather than 844 * report that we are attempting to fail over. 845 */ 846 if (newNet.isAvailable()) { 847 NetworkInfo switchTo = newNet.getNetworkInfo(); 848 switchTo.setFailover(true); 849 if (!switchTo.isConnectedOrConnecting() || 850 newNet.isTeardownRequested()) { 851 newNet.reconnect(); 852 } 853 if (DBG) { 854 if (switchTo.isConnected()) { 855 Log.v(TAG, "Switching to already connected " + 856 switchTo.getTypeName()); 857 } else { 858 Log.v(TAG, "Attempting to switch to " + 859 switchTo.getTypeName()); 860 } 861 } 862 intent.putExtra(ConnectivityManager. 863 EXTRA_OTHER_NETWORK_INFO, switchTo); 864 } else { 865 intent.putExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY, 866 true); 867 newNet.reconnect(); 868 } 869 } else { 870 intent.putExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY, 871 true); 872 } 873 } 874 875 // do this before we broadcast the change 876 handleConnectivityChange(); 877 878 sendStickyBroadcast(intent); 879 /* 880 * If the failover network is already connected, then immediately send 881 * out a followup broadcast indicating successful failover 882 */ 883 if (newNet != null && newNet.getNetworkInfo().isConnected()) 884 sendConnectedBroadcast(newNet.getNetworkInfo()); 885 } 886 887 private void sendConnectedBroadcast(NetworkInfo info) { 888 Intent intent = new Intent(ConnectivityManager.CONNECTIVITY_ACTION); 889 intent.putExtra(ConnectivityManager.EXTRA_NETWORK_INFO, info); 890 if (info.isFailover()) { 891 intent.putExtra(ConnectivityManager.EXTRA_IS_FAILOVER, true); 892 info.setFailover(false); 893 } 894 if (info.getReason() != null) { 895 intent.putExtra(ConnectivityManager.EXTRA_REASON, info.getReason()); 896 } 897 if (info.getExtraInfo() != null) { 898 intent.putExtra(ConnectivityManager.EXTRA_EXTRA_INFO, 899 info.getExtraInfo()); 900 } 901 sendStickyBroadcast(intent); 902 } 903 904 /** 905 * Called when an attempt to fail over to another network has failed. 906 * @param info the {@link NetworkInfo} for the failed network 907 */ 908 private void handleConnectionFailure(NetworkInfo info) { 909 mNetTrackers[info.getType()].setTeardownRequested(false); 910 911 String reason = info.getReason(); 912 String extraInfo = info.getExtraInfo(); 913 914 if (DBG) { 915 String reasonText; 916 if (reason == null) { 917 reasonText = "."; 918 } else { 919 reasonText = " (" + reason + ")."; 920 } 921 Log.v(TAG, "Attempt to connect to " + info.getTypeName() + 922 " failed" + reasonText); 923 } 924 925 Intent intent = new Intent(ConnectivityManager.CONNECTIVITY_ACTION); 926 intent.putExtra(ConnectivityManager.EXTRA_NETWORK_INFO, info); 927 if (getActiveNetworkInfo() == null) { 928 intent.putExtra(ConnectivityManager.EXTRA_NO_CONNECTIVITY, true); 929 } 930 if (reason != null) { 931 intent.putExtra(ConnectivityManager.EXTRA_REASON, reason); 932 } 933 if (extraInfo != null) { 934 intent.putExtra(ConnectivityManager.EXTRA_EXTRA_INFO, extraInfo); 935 } 936 if (info.isFailover()) { 937 intent.putExtra(ConnectivityManager.EXTRA_IS_FAILOVER, true); 938 info.setFailover(false); 939 } 940 sendStickyBroadcast(intent); 941 } 942 943 private void sendStickyBroadcast(Intent intent) { 944 synchronized(this) { 945 if (mSystemReady) { 946 mContext.sendStickyBroadcast(intent); 947 } else { 948 if (mDeferredBroadcasts == null) { 949 mDeferredBroadcasts = new ArrayList<Intent>(); 950 } 951 mDeferredBroadcasts.add(intent); 952 } 953 } 954 } 955 956 void systemReady() { 957 synchronized(this) { 958 mSystemReady = true; 959 if (mDeferredBroadcasts != null) { 960 int count = mDeferredBroadcasts.size(); 961 for (int i = 0; i < count; i++) { 962 mContext.sendStickyBroadcast(mDeferredBroadcasts.get(i)); 963 } 964 mDeferredBroadcasts = null; 965 } 966 } 967 } 968 969 private void handleConnect(NetworkInfo info) { 970 int type = info.getType(); 971 972 // snapshot isFailover, because sendConnectedBroadcast() resets it 973 boolean isFailover = info.isFailover(); 974 NetworkStateTracker thisNet = mNetTrackers[type]; 975 976 // if this is a default net and other default is running 977 // kill the one not preferred 978 if (mNetAttributes[type].isDefault()) { 979 if (mActiveDefaultNetwork != -1 && mActiveDefaultNetwork != type) { 980 if ((type != mNetworkPreference && 981 mNetAttributes[mActiveDefaultNetwork].mPriority > 982 mNetAttributes[type].mPriority) || 983 mNetworkPreference == mActiveDefaultNetwork) { 984 // don't accept this one 985 if (DBG) Log.v(TAG, "Not broadcasting CONNECT_ACTION " + 986 "to torn down network " + info.getTypeName()); 987 teardown(thisNet); 988 return; 989 } else { 990 // tear down the other 991 NetworkStateTracker otherNet = 992 mNetTrackers[mActiveDefaultNetwork]; 993 if (DBG) Log.v(TAG, "Policy requires " + 994 otherNet.getNetworkInfo().getTypeName() + 995 " teardown"); 996 if (!teardown(otherNet)) { 997 Log.e(TAG, "Network declined teardown request"); 998 return; 999 } 1000 if (isFailover) { 1001 otherNet.releaseWakeLock(); 1002 } 1003 } 1004 } 1005 mActiveDefaultNetwork = type; 1006 } 1007 thisNet.setTeardownRequested(false); 1008 thisNet.updateNetworkSettings(); 1009 handleConnectivityChange(); 1010 sendConnectedBroadcast(info); 1011 } 1012 1013 private void handleScanResultsAvailable(NetworkInfo info) { 1014 int networkType = info.getType(); 1015 if (networkType != ConnectivityManager.TYPE_WIFI) { 1016 if (DBG) Log.v(TAG, "Got ScanResultsAvailable for " + 1017 info.getTypeName() + " network. Don't know how to handle."); 1018 } 1019 1020 mNetTrackers[networkType].interpretScanResultsAvailable(); 1021 } 1022 1023 private void handleNotificationChange(boolean visible, int id, 1024 Notification notification) { 1025 NotificationManager notificationManager = (NotificationManager) mContext 1026 .getSystemService(Context.NOTIFICATION_SERVICE); 1027 1028 if (visible) { 1029 notificationManager.notify(id, notification); 1030 } else { 1031 notificationManager.cancel(id); 1032 } 1033 } 1034 1035 /** 1036 * After any kind of change in the connectivity state of any network, 1037 * make sure that anything that depends on the connectivity state of 1038 * more than one network is set up correctly. We're mainly concerned 1039 * with making sure that the list of DNS servers is set up according 1040 * to which networks are connected, and ensuring that the right routing 1041 * table entries exist. 1042 */ 1043 private void handleConnectivityChange() { 1044 /* 1045 * If a non-default network is enabled, add the host routes that 1046 * will allow it's DNS servers to be accessed. Only 1047 * If both mobile and wifi are enabled, add the host routes that 1048 * will allow MMS traffic to pass on the mobile network. But 1049 * remove the default route for the mobile network, so that there 1050 * will be only one default route, to ensure that all traffic 1051 * except MMS will travel via Wi-Fi. 1052 */ 1053 handleDnsConfigurationChange(); 1054 1055 for (int netType : mPriorityList) { 1056 if (mNetTrackers[netType].getNetworkInfo().isConnected()) { 1057 if (mNetAttributes[netType].isDefault()) { 1058 mNetTrackers[netType].addDefaultRoute(); 1059 } else { 1060 mNetTrackers[netType].addPrivateDnsRoutes(); 1061 } 1062 } else { 1063 if (mNetAttributes[netType].isDefault()) { 1064 mNetTrackers[netType].removeDefaultRoute(); 1065 } else { 1066 mNetTrackers[netType].removePrivateDnsRoutes(); 1067 } 1068 } 1069 } 1070 } 1071 1072 /** 1073 * Adjust the per-process dns entries (net.dns<x>.<pid>) based 1074 * on the highest priority active net which this process requested. 1075 * If there aren't any, clear it out 1076 */ 1077 private void reassessPidDns(int myPid, boolean doBump) 1078 { 1079 if (DBG) Log.d(TAG, "reassessPidDns for pid " + myPid); 1080 for(int i : mPriorityList) { 1081 if (mNetAttributes[i].isDefault()) { 1082 continue; 1083 } 1084 NetworkStateTracker nt = mNetTrackers[i]; 1085 if (nt.getNetworkInfo().isConnected() && 1086 !nt.isTeardownRequested()) { 1087 List pids = mNetRequestersPids[i]; 1088 for (int j=0; j<pids.size(); j++) { 1089 Integer pid = (Integer)pids.get(j); 1090 if (pid.intValue() == myPid) { 1091 String[] dnsList = nt.getNameServers(); 1092 writePidDns(dnsList, myPid); 1093 if (doBump) { 1094 bumpDns(); 1095 } 1096 return; 1097 } 1098 } 1099 } 1100 } 1101 // nothing found - delete 1102 for (int i = 1; ; i++) { 1103 String prop = "net.dns" + i + "." + myPid; 1104 if (SystemProperties.get(prop).length() == 0) { 1105 if (doBump) { 1106 bumpDns(); 1107 } 1108 return; 1109 } 1110 SystemProperties.set(prop, ""); 1111 } 1112 } 1113 1114 private void writePidDns(String[] dnsList, int pid) { 1115 int j = 1; 1116 for (String dns : dnsList) { 1117 if (dns != null && !TextUtils.equals(dns, "0.0.0.0")) { 1118 SystemProperties.set("net.dns" + j++ + "." + pid, dns); 1119 } 1120 } 1121 } 1122 1123 private void bumpDns() { 1124 /* 1125 * Bump the property that tells the name resolver library to reread 1126 * the DNS server list from the properties. 1127 */ 1128 String propVal = SystemProperties.get("net.dnschange"); 1129 int n = 0; 1130 if (propVal.length() != 0) { 1131 try { 1132 n = Integer.parseInt(propVal); 1133 } catch (NumberFormatException e) {} 1134 } 1135 SystemProperties.set("net.dnschange", "" + (n+1)); 1136 } 1137 1138 private void handleDnsConfigurationChange() { 1139 // add default net's dns entries 1140 for (int x = mPriorityList.length-1; x>= 0; x--) { 1141 int netType = mPriorityList[x]; 1142 NetworkStateTracker nt = mNetTrackers[netType]; 1143 if (nt != null && nt.getNetworkInfo().isConnected() && 1144 !nt.isTeardownRequested()) { 1145 String[] dnsList = nt.getNameServers(); 1146 if (mNetAttributes[netType].isDefault()) { 1147 int j = 1; 1148 for (String dns : dnsList) { 1149 if (dns != null && !TextUtils.equals(dns, "0.0.0.0")) { 1150 if (DBG) { 1151 Log.d(TAG, "adding dns " + dns + " for " + 1152 nt.getNetworkInfo().getTypeName()); 1153 } 1154 SystemProperties.set("net.dns" + j++, dns); 1155 } 1156 } 1157 for (int k=j ; k<mNumDnsEntries; k++) { 1158 if (DBG) Log.d(TAG, "erasing net.dns" + k); 1159 SystemProperties.set("net.dns" + k, ""); 1160 } 1161 mNumDnsEntries = j; 1162 } else { 1163 // set per-pid dns for attached secondary nets 1164 List pids = mNetRequestersPids[netType]; 1165 for (int y=0; y< pids.size(); y++) { 1166 Integer pid = (Integer)pids.get(y); 1167 writePidDns(dnsList, pid.intValue()); 1168 } 1169 } 1170 } 1171 } 1172 1173 bumpDns(); 1174 } 1175 1176 private int getRestoreDefaultNetworkDelay() { 1177 String restoreDefaultNetworkDelayStr = SystemProperties.get( 1178 NETWORK_RESTORE_DELAY_PROP_NAME); 1179 if(restoreDefaultNetworkDelayStr != null && 1180 restoreDefaultNetworkDelayStr.length() != 0) { 1181 try { 1182 return Integer.valueOf(restoreDefaultNetworkDelayStr); 1183 } catch (NumberFormatException e) { 1184 } 1185 } 1186 return RESTORE_DEFAULT_NETWORK_DELAY; 1187 } 1188 1189 @Override 1190 protected void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 1191 if (mContext.checkCallingOrSelfPermission( 1192 android.Manifest.permission.DUMP) 1193 != PackageManager.PERMISSION_GRANTED) { 1194 pw.println("Permission Denial: can't dump ConnectivityService " + 1195 "from from pid=" + Binder.getCallingPid() + ", uid=" + 1196 Binder.getCallingUid()); 1197 return; 1198 } 1199 pw.println(); 1200 for (NetworkStateTracker nst : mNetTrackers) { 1201 if (nst.getNetworkInfo().isConnected()) { 1202 pw.println("Active network: " + nst.getNetworkInfo(). 1203 getTypeName()); 1204 } 1205 pw.println(nst.getNetworkInfo()); 1206 pw.println(nst); 1207 pw.println(); 1208 } 1209 } 1210 1211 // must be stateless - things change under us. 1212 private class MyHandler extends Handler { 1213 @Override 1214 public void handleMessage(Message msg) { 1215 NetworkInfo info; 1216 switch (msg.what) { 1217 case NetworkStateTracker.EVENT_STATE_CHANGED: 1218 info = (NetworkInfo) msg.obj; 1219 if (DBG) Log.d(TAG, "ConnectivityChange for " + 1220 info.getTypeName() + ": " + 1221 info.getState() + "/" + info.getDetailedState()); 1222 1223 // Connectivity state changed: 1224 // [31-13] Reserved for future use 1225 // [12-9] Network subtype (for mobile network, as defined 1226 // by TelephonyManager) 1227 // [8-3] Detailed state ordinal (as defined by 1228 // NetworkInfo.DetailedState) 1229 // [2-0] Network type (as defined by ConnectivityManager) 1230 int eventLogParam = (info.getType() & 0x7) | 1231 ((info.getDetailedState().ordinal() & 0x3f) << 3) | 1232 (info.getSubtype() << 9); 1233 EventLog.writeEvent(EVENTLOG_CONNECTIVITY_STATE_CHANGED, 1234 eventLogParam); 1235 1236 if (info.getDetailedState() == 1237 NetworkInfo.DetailedState.FAILED) { 1238 handleConnectionFailure(info); 1239 } else if (info.getState() == 1240 NetworkInfo.State.DISCONNECTED) { 1241 handleDisconnect(info); 1242 } else if (info.getState() == NetworkInfo.State.SUSPENDED) { 1243 // TODO: need to think this over. 1244 // the logic here is, handle SUSPENDED the same as 1245 // DISCONNECTED. The only difference being we are 1246 // broadcasting an intent with NetworkInfo that's 1247 // suspended. This allows the applications an 1248 // opportunity to handle DISCONNECTED and SUSPENDED 1249 // differently, or not. 1250 handleDisconnect(info); 1251 } else if (info.getState() == NetworkInfo.State.CONNECTED) { 1252 handleConnect(info); 1253 } 1254 break; 1255 1256 case NetworkStateTracker.EVENT_SCAN_RESULTS_AVAILABLE: 1257 info = (NetworkInfo) msg.obj; 1258 handleScanResultsAvailable(info); 1259 break; 1260 1261 case NetworkStateTracker.EVENT_NOTIFICATION_CHANGED: 1262 handleNotificationChange(msg.arg1 == 1, msg.arg2, 1263 (Notification) msg.obj); 1264 1265 case NetworkStateTracker.EVENT_CONFIGURATION_CHANGED: 1266 handleDnsConfigurationChange(); 1267 break; 1268 1269 case NetworkStateTracker.EVENT_ROAMING_CHANGED: 1270 // fill me in 1271 break; 1272 1273 case NetworkStateTracker.EVENT_NETWORK_SUBTYPE_CHANGED: 1274 // fill me in 1275 break; 1276 case NetworkStateTracker.EVENT_RESTORE_DEFAULT_NETWORK: 1277 FeatureUser u = (FeatureUser)msg.obj; 1278 u.expire(); 1279 break; 1280 } 1281 } 1282 } 1283} 1284