1 /* 2 * Copyright (C) 2009 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 android.content.pm; 18 19 import android.content.Context; 20 import android.content.BroadcastReceiver; 21 import android.content.Intent; 22 import android.content.IntentFilter; 23 import android.content.ComponentName; 24 import android.content.pm.PackageManager.NameNotFoundException; 25 import android.content.res.Resources; 26 import android.content.res.XmlResourceParser; 27 import android.os.Environment; 28 import android.os.Handler; 29 import android.util.Log; 30 import android.util.AttributeSet; 31 import android.util.Xml; 32 33 import java.util.Map; 34 import java.util.Collection; 35 import java.util.Collections; 36 import java.util.HashMap; 37 import java.util.List; 38 import java.util.ArrayList; 39 import java.util.concurrent.atomic.AtomicReference; 40 import java.io.File; 41 import java.io.FileOutputStream; 42 import java.io.FileDescriptor; 43 import java.io.PrintWriter; 44 import java.io.IOException; 45 import java.io.FileInputStream; 46 47 import com.android.internal.os.AtomicFile; 48 import com.android.internal.util.FastXmlSerializer; 49 50 import com.google.android.collect.Maps; 51 import com.google.android.collect.Lists; 52 53 import org.xmlpull.v1.XmlPullParserException; 54 import org.xmlpull.v1.XmlPullParser; 55 import org.xmlpull.v1.XmlSerializer; 56 57 /** 58 * A cache of registered services. This cache 59 * is built by interrogating the {@link PackageManager} and is updated as packages are added, 60 * removed and changed. The services are referred to by type V and 61 * are made available via the {@link #getServiceInfo} method. 62 * @hide 63 */ 64 public abstract class RegisteredServicesCache<V> { 65 private static final String TAG = "PackageManager"; 66 67 public final Context mContext; 68 private final String mInterfaceName; 69 private final String mMetaDataName; 70 private final String mAttributesName; 71 private final XmlSerializerAndParser<V> mSerializerAndParser; 72 private final AtomicReference<BroadcastReceiver> mReceiver; 73 74 private final Object mServicesLock = new Object(); 75 // synchronized on mServicesLock 76 private HashMap<V, Integer> mPersistentServices; 77 // synchronized on mServicesLock 78 private Map<V, ServiceInfo<V>> mServices; 79 // synchronized on mServicesLock 80 private boolean mPersistentServicesFileDidNotExist; 81 82 /** 83 * This file contains the list of known services. We would like to maintain this forever 84 * so we store it as an XML file. 85 */ 86 private final AtomicFile mPersistentServicesFile; 87 88 // the listener and handler are synchronized on "this" and must be updated together 89 private RegisteredServicesCacheListener<V> mListener; 90 private Handler mHandler; 91 92 public RegisteredServicesCache(Context context, String interfaceName, String metaDataName, 93 String attributeName, XmlSerializerAndParser<V> serializerAndParser) { 94 mContext = context; 95 mInterfaceName = interfaceName; 96 mMetaDataName = metaDataName; 97 mAttributesName = attributeName; 98 mSerializerAndParser = serializerAndParser; 99 100 File dataDir = Environment.getDataDirectory(); 101 File systemDir = new File(dataDir, "system"); 102 File syncDir = new File(systemDir, "registered_services"); 103 mPersistentServicesFile = new AtomicFile(new File(syncDir, interfaceName + ".xml")); 104 105 generateServicesMap(); 106 107 final BroadcastReceiver receiver = new BroadcastReceiver() { 108 @Override 109 public void onReceive(Context context1, Intent intent) { 110 generateServicesMap(); 111 } 112 }; 113 mReceiver = new AtomicReference<BroadcastReceiver>(receiver); 114 IntentFilter intentFilter = new IntentFilter(); 115 intentFilter.addAction(Intent.ACTION_PACKAGE_ADDED); 116 intentFilter.addAction(Intent.ACTION_PACKAGE_CHANGED); 117 intentFilter.addAction(Intent.ACTION_PACKAGE_REMOVED); 118 intentFilter.addDataScheme("package"); 119 mContext.registerReceiver(receiver, intentFilter); 120 // Register for events related to sdcard installation. 121 IntentFilter sdFilter = new IntentFilter(); 122 sdFilter.addAction(Intent.ACTION_EXTERNAL_APPLICATIONS_AVAILABLE); 123 sdFilter.addAction(Intent.ACTION_EXTERNAL_APPLICATIONS_UNAVAILABLE); 124 mContext.registerReceiver(receiver, sdFilter); 125 } 126 127 public void dump(FileDescriptor fd, PrintWriter fout, String[] args) { 128 Map<V, ServiceInfo<V>> services; 129 synchronized (mServicesLock) { 130 services = mServices; 131 } 132 fout.println("RegisteredServicesCache: " + services.size() + " services"); 133 for (ServiceInfo info : services.values()) { 134 fout.println(" " + info); 135 } 136 } 137 138 public RegisteredServicesCacheListener<V> getListener() { 139 synchronized (this) { 140 return mListener; 141 } 142 } 143 144 public void setListener(RegisteredServicesCacheListener<V> listener, Handler handler) { 145 if (handler == null) { 146 handler = new Handler(mContext.getMainLooper()); 147 } 148 synchronized (this) { 149 mHandler = handler; 150 mListener = listener; 151 } 152 } 153 154 private void notifyListener(final V type, final boolean removed) { 155 if (Log.isLoggable(TAG, Log.VERBOSE)) { 156 Log.d(TAG, "notifyListener: " + type + " is " + (removed ? "removed" : "added")); 157 } 158 RegisteredServicesCacheListener<V> listener; 159 Handler handler; 160 synchronized (this) { 161 listener = mListener; 162 handler = mHandler; 163 } 164 if (listener == null) { 165 return; 166 } 167 168 final RegisteredServicesCacheListener<V> listener2 = listener; 169 handler.post(new Runnable() { 170 public void run() { 171 listener2.onServiceChanged(type, removed); 172 } 173 }); 174 } 175 176 /** 177 * Value type that describes a Service. The information within can be used 178 * to bind to the service. 179 */ 180 public static class ServiceInfo<V> { 181 public final V type; 182 public final ComponentName componentName; 183 public final int uid; 184 185 /** @hide */ 186 public ServiceInfo(V type, ComponentName componentName, int uid) { 187 this.type = type; 188 this.componentName = componentName; 189 this.uid = uid; 190 } 191 192 @Override 193 public String toString() { 194 return "ServiceInfo: " + type + ", " + componentName + ", uid " + uid; 195 } 196 } 197 198 /** 199 * Accessor for the registered authenticators. 200 * @param type the account type of the authenticator 201 * @return the AuthenticatorInfo that matches the account type or null if none is present 202 */ 203 public ServiceInfo<V> getServiceInfo(V type) { 204 synchronized (mServicesLock) { 205 return mServices.get(type); 206 } 207 } 208 209 /** 210 * @return a collection of {@link RegisteredServicesCache.ServiceInfo} objects for all 211 * registered authenticators. 212 */ 213 public Collection<ServiceInfo<V>> getAllServices() { 214 synchronized (mServicesLock) { 215 return Collections.unmodifiableCollection(mServices.values()); 216 } 217 } 218 219 /** 220 * Stops the monitoring of package additions, removals and changes. 221 */ 222 public void close() { 223 final BroadcastReceiver receiver = mReceiver.getAndSet(null); 224 if (receiver != null) { 225 mContext.unregisterReceiver(receiver); 226 } 227 } 228 229 @Override 230 protected void finalize() throws Throwable { 231 if (mReceiver.get() != null) { 232 Log.e(TAG, "RegisteredServicesCache finalized without being closed"); 233 } 234 close(); 235 super.finalize(); 236 } 237 238 private boolean inSystemImage(int callerUid) { 239 String[] packages = mContext.getPackageManager().getPackagesForUid(callerUid); 240 for (String name : packages) { 241 try { 242 PackageInfo packageInfo = 243 mContext.getPackageManager().getPackageInfo(name, 0 /* flags */); 244 if ((packageInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) { 245 return true; 246 } 247 } catch (PackageManager.NameNotFoundException e) { 248 return false; 249 } 250 } 251 return false; 252 } 253 254 void generateServicesMap() { 255 PackageManager pm = mContext.getPackageManager(); 256 ArrayList<ServiceInfo<V>> serviceInfos = new ArrayList<ServiceInfo<V>>(); 257 List<ResolveInfo> resolveInfos = pm.queryIntentServices(new Intent(mInterfaceName), 258 PackageManager.GET_META_DATA); 259 for (ResolveInfo resolveInfo : resolveInfos) { 260 try { 261 ServiceInfo<V> info = parseServiceInfo(resolveInfo); 262 if (info == null) { 263 Log.w(TAG, "Unable to load service info " + resolveInfo.toString()); 264 continue; 265 } 266 serviceInfos.add(info); 267 } catch (XmlPullParserException e) { 268 Log.w(TAG, "Unable to load service info " + resolveInfo.toString(), e); 269 } catch (IOException e) { 270 Log.w(TAG, "Unable to load service info " + resolveInfo.toString(), e); 271 } 272 } 273 274 synchronized (mServicesLock) { 275 if (mPersistentServices == null) { 276 readPersistentServicesLocked(); 277 } 278 mServices = Maps.newHashMap(); 279 StringBuilder changes = new StringBuilder(); 280 for (ServiceInfo<V> info : serviceInfos) { 281 // four cases: 282 // - doesn't exist yet 283 // - add, notify user that it was added 284 // - exists and the UID is the same 285 // - replace, don't notify user 286 // - exists, the UID is different, and the new one is not a system package 287 // - ignore 288 // - exists, the UID is different, and the new one is a system package 289 // - add, notify user that it was added 290 Integer previousUid = mPersistentServices.get(info.type); 291 if (previousUid == null) { 292 changes.append(" New service added: ").append(info).append("\n"); 293 mServices.put(info.type, info); 294 mPersistentServices.put(info.type, info.uid); 295 if (!mPersistentServicesFileDidNotExist) { 296 notifyListener(info.type, false /* removed */); 297 } 298 } else if (previousUid == info.uid) { 299 if (Log.isLoggable(TAG, Log.VERBOSE)) { 300 changes.append(" Existing service (nop): ").append(info).append("\n"); 301 } 302 mServices.put(info.type, info); 303 } else if (inSystemImage(info.uid) 304 || !containsTypeAndUid(serviceInfos, info.type, previousUid)) { 305 if (inSystemImage(info.uid)) { 306 changes.append(" System service replacing existing: ").append(info) 307 .append("\n"); 308 } else { 309 changes.append(" Existing service replacing a removed service: ") 310 .append(info).append("\n"); 311 } 312 mServices.put(info.type, info); 313 mPersistentServices.put(info.type, info.uid); 314 notifyListener(info.type, false /* removed */); 315 } else { 316 // ignore 317 changes.append(" Existing service with new uid ignored: ").append(info) 318 .append("\n"); 319 } 320 } 321 322 ArrayList<V> toBeRemoved = Lists.newArrayList(); 323 for (V v1 : mPersistentServices.keySet()) { 324 if (!containsType(serviceInfos, v1)) { 325 toBeRemoved.add(v1); 326 } 327 } 328 for (V v1 : toBeRemoved) { 329 mPersistentServices.remove(v1); 330 changes.append(" Service removed: ").append(v1).append("\n"); 331 notifyListener(v1, true /* removed */); 332 } 333 if (changes.length() > 0) { 334 Log.d(TAG, "generateServicesMap(" + mInterfaceName + "): " + 335 serviceInfos.size() + " services:\n" + changes); 336 writePersistentServicesLocked(); 337 } else { 338 Log.d(TAG, "generateServicesMap(" + mInterfaceName + "): " + 339 serviceInfos.size() + " services unchanged"); 340 } 341 mPersistentServicesFileDidNotExist = false; 342 } 343 } 344 345 private boolean containsType(ArrayList<ServiceInfo<V>> serviceInfos, V type) { 346 for (int i = 0, N = serviceInfos.size(); i < N; i++) { 347 if (serviceInfos.get(i).type.equals(type)) { 348 return true; 349 } 350 } 351 352 return false; 353 } 354 355 private boolean containsTypeAndUid(ArrayList<ServiceInfo<V>> serviceInfos, V type, int uid) { 356 for (int i = 0, N = serviceInfos.size(); i < N; i++) { 357 final ServiceInfo<V> serviceInfo = serviceInfos.get(i); 358 if (serviceInfo.type.equals(type) && serviceInfo.uid == uid) { 359 return true; 360 } 361 } 362 363 return false; 364 } 365 366 private ServiceInfo<V> parseServiceInfo(ResolveInfo service) 367 throws XmlPullParserException, IOException { 368 android.content.pm.ServiceInfo si = service.serviceInfo; 369 ComponentName componentName = new ComponentName(si.packageName, si.name); 370 371 PackageManager pm = mContext.getPackageManager(); 372 373 XmlResourceParser parser = null; 374 try { 375 parser = si.loadXmlMetaData(pm, mMetaDataName); 376 if (parser == null) { 377 throw new XmlPullParserException("No " + mMetaDataName + " meta-data"); 378 } 379 380 AttributeSet attrs = Xml.asAttributeSet(parser); 381 382 int type; 383 while ((type=parser.next()) != XmlPullParser.END_DOCUMENT 384 && type != XmlPullParser.START_TAG) { 385 } 386 387 String nodeName = parser.getName(); 388 if (!mAttributesName.equals(nodeName)) { 389 throw new XmlPullParserException( 390 "Meta-data does not start with " + mAttributesName + " tag"); 391 } 392 393 V v = parseServiceAttributes(pm.getResourcesForApplication(si.applicationInfo), 394 si.packageName, attrs); 395 if (v == null) { 396 return null; 397 } 398 final android.content.pm.ServiceInfo serviceInfo = service.serviceInfo; 399 final ApplicationInfo applicationInfo = serviceInfo.applicationInfo; 400 final int uid = applicationInfo.uid; 401 return new ServiceInfo<V>(v, componentName, uid); 402 } catch (NameNotFoundException e) { 403 throw new XmlPullParserException( 404 "Unable to load resources for pacakge " + si.packageName); 405 } finally { 406 if (parser != null) parser.close(); 407 } 408 } 409 410 /** 411 * Read all sync status back in to the initial engine state. 412 */ 413 private void readPersistentServicesLocked() { 414 mPersistentServices = Maps.newHashMap(); 415 if (mSerializerAndParser == null) { 416 return; 417 } 418 FileInputStream fis = null; 419 try { 420 mPersistentServicesFileDidNotExist = !mPersistentServicesFile.getBaseFile().exists(); 421 if (mPersistentServicesFileDidNotExist) { 422 return; 423 } 424 fis = mPersistentServicesFile.openRead(); 425 XmlPullParser parser = Xml.newPullParser(); 426 parser.setInput(fis, null); 427 int eventType = parser.getEventType(); 428 while (eventType != XmlPullParser.START_TAG) { 429 eventType = parser.next(); 430 } 431 String tagName = parser.getName(); 432 if ("services".equals(tagName)) { 433 eventType = parser.next(); 434 do { 435 if (eventType == XmlPullParser.START_TAG && parser.getDepth() == 2) { 436 tagName = parser.getName(); 437 if ("service".equals(tagName)) { 438 V service = mSerializerAndParser.createFromXml(parser); 439 if (service == null) { 440 break; 441 } 442 String uidString = parser.getAttributeValue(null, "uid"); 443 int uid = Integer.parseInt(uidString); 444 mPersistentServices.put(service, uid); 445 } 446 } 447 eventType = parser.next(); 448 } while (eventType != XmlPullParser.END_DOCUMENT); 449 } 450 } catch (Exception e) { 451 Log.w(TAG, "Error reading persistent services, starting from scratch", e); 452 } finally { 453 if (fis != null) { 454 try { 455 fis.close(); 456 } catch (java.io.IOException e1) { 457 } 458 } 459 } 460 } 461 462 /** 463 * Write all sync status to the sync status file. 464 */ 465 private void writePersistentServicesLocked() { 466 if (mSerializerAndParser == null) { 467 return; 468 } 469 FileOutputStream fos = null; 470 try { 471 fos = mPersistentServicesFile.startWrite(); 472 XmlSerializer out = new FastXmlSerializer(); 473 out.setOutput(fos, "utf-8"); 474 out.startDocument(null, true); 475 out.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true); 476 out.startTag(null, "services"); 477 for (Map.Entry<V, Integer> service : mPersistentServices.entrySet()) { 478 out.startTag(null, "service"); 479 out.attribute(null, "uid", Integer.toString(service.getValue())); 480 mSerializerAndParser.writeAsXml(service.getKey(), out); 481 out.endTag(null, "service"); 482 } 483 out.endTag(null, "services"); 484 out.endDocument(); 485 mPersistentServicesFile.finishWrite(fos); 486 } catch (java.io.IOException e1) { 487 Log.w(TAG, "Error writing accounts", e1); 488 if (fos != null) { 489 mPersistentServicesFile.failWrite(fos); 490 } 491 } 492 } 493 494 public abstract V parseServiceAttributes(Resources res, 495 String packageName, AttributeSet attrs); 496 } 497
