1 /*
2  * Copyright (C) 2006 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.server.am;
18 
19 import android.app.IActivityManager.ContentProviderHolder;
20 import android.content.ComponentName;
21 import android.content.IContentProvider;
22 import android.content.pm.ApplicationInfo;
23 import android.content.pm.ProviderInfo;
24 import android.os.IBinder;
25 import android.os.IBinder.DeathRecipient;
26 import android.os.Process;
27 import android.os.RemoteException;
28 import android.os.UserHandle;
29 import android.util.Slog;
30 
31 import java.io.PrintWriter;
32 import java.util.ArrayList;
33 import java.util.HashMap;
34 
35 final class ContentProviderRecord {
36     final ActivityManagerService service;
37     public final ProviderInfo info;
38     final int uid;
39     final ApplicationInfo appInfo;
40     final ComponentName name;
41     final boolean singleton;
42     public IContentProvider provider;
43     public boolean noReleaseNeeded;
44     // All attached clients
45     final ArrayList<ContentProviderConnection> connections
46             = new ArrayList<ContentProviderConnection>();
47     //final HashSet<ProcessRecord> clients = new HashSet<ProcessRecord>();
48     // Handles for non-framework processes supported by this provider
49     HashMap<IBinder, ExternalProcessHandle> externalProcessTokenToHandle;
50     // Count for external process for which we have no handles.
51     int externalProcessNoHandleCount;
52     ProcessRecord proc; // if non-null, hosting process.
53     ProcessRecord launchingApp; // if non-null, waiting for this app to be launched.
54     String stringName;
55     String shortStringName;
56 
ContentProviderRecord(ActivityManagerService _service, ProviderInfo _info, ApplicationInfo ai, ComponentName _name, boolean _singleton)57     public ContentProviderRecord(ActivityManagerService _service, ProviderInfo _info,
58             ApplicationInfo ai, ComponentName _name, boolean _singleton) {
59         service = _service;
60         info = _info;
61         uid = ai.uid;
62         appInfo = ai;
63         name = _name;
64         singleton = _singleton;
65         noReleaseNeeded = uid == 0 || uid == Process.SYSTEM_UID;
66     }
67 
ContentProviderRecord(ContentProviderRecord cpr)68     public ContentProviderRecord(ContentProviderRecord cpr) {
69         service = cpr.service;
70         info = cpr.info;
71         uid = cpr.uid;
72         appInfo = cpr.appInfo;
73         name = cpr.name;
74         singleton = cpr.singleton;
75         noReleaseNeeded = cpr.noReleaseNeeded;
76     }
77 
newHolder(ContentProviderConnection conn)78     public ContentProviderHolder newHolder(ContentProviderConnection conn) {
79         ContentProviderHolder holder = new ContentProviderHolder(info);
80         holder.provider = provider;
81         holder.noReleaseNeeded = noReleaseNeeded;
82         holder.connection = conn;
83         return holder;
84     }
85 
canRunHere(ProcessRecord app)86     public boolean canRunHere(ProcessRecord app) {
87         return (info.multiprocess || info.processName.equals(app.processName))
88                 && uid == app.info.uid;
89     }
90 
addExternalProcessHandleLocked(IBinder token)91     public void addExternalProcessHandleLocked(IBinder token) {
92         if (token == null) {
93             externalProcessNoHandleCount++;
94         } else {
95             if (externalProcessTokenToHandle == null) {
96                 externalProcessTokenToHandle = new HashMap<IBinder, ExternalProcessHandle>();
97             }
98             ExternalProcessHandle handle = externalProcessTokenToHandle.get(token);
99             if (handle == null) {
100                 handle = new ExternalProcessHandle(token);
101                 externalProcessTokenToHandle.put(token, handle);
102             }
103             handle.mAcquisitionCount++;
104         }
105     }
106 
removeExternalProcessHandleLocked(IBinder token)107     public boolean removeExternalProcessHandleLocked(IBinder token) {
108         if (hasExternalProcessHandles()) {
109             boolean hasHandle = false;
110             if (externalProcessTokenToHandle != null) {
111                 ExternalProcessHandle handle = externalProcessTokenToHandle.get(token);
112                 if (handle != null) {
113                     hasHandle = true;
114                     handle.mAcquisitionCount--;
115                     if (handle.mAcquisitionCount == 0) {
116                         removeExternalProcessHandleInternalLocked(token);
117                         return true;
118                     }
119                 }
120             }
121             if (!hasHandle) {
122                 externalProcessNoHandleCount--;
123                 return true;
124             }
125         }
126         return false;
127     }
128 
removeExternalProcessHandleInternalLocked(IBinder token)129     private void removeExternalProcessHandleInternalLocked(IBinder token) {
130         ExternalProcessHandle handle = externalProcessTokenToHandle.get(token);
131         handle.unlinkFromOwnDeathLocked();
132         externalProcessTokenToHandle.remove(token);
133         if (externalProcessTokenToHandle.size() == 0) {
134             externalProcessTokenToHandle = null;
135         }
136     }
137 
hasExternalProcessHandles()138     public boolean hasExternalProcessHandles() {
139         return (externalProcessTokenToHandle != null || externalProcessNoHandleCount > 0);
140     }
141 
dump(PrintWriter pw, String prefix, boolean full)142     void dump(PrintWriter pw, String prefix, boolean full) {
143         if (full) {
144             pw.print(prefix); pw.print("package=");
145                     pw.print(info.applicationInfo.packageName);
146                     pw.print(" process="); pw.println(info.processName);
147         }
148         pw.print(prefix); pw.print("proc="); pw.println(proc);
149         if (launchingApp != null) {
150             pw.print(prefix); pw.print("launchingApp="); pw.println(launchingApp);
151         }
152         if (full) {
153             pw.print(prefix); pw.print("uid="); pw.print(uid);
154                     pw.print(" provider="); pw.println(provider);
155         }
156         if (singleton) {
157             pw.print(prefix); pw.print("singleton="); pw.println(singleton);
158         }
159         pw.print(prefix); pw.print("authority="); pw.println(info.authority);
160         if (full) {
161             if (info.isSyncable || info.multiprocess || info.initOrder != 0) {
162                 pw.print(prefix); pw.print("isSyncable="); pw.print(info.isSyncable);
163                         pw.print(" multiprocess="); pw.print(info.multiprocess);
164                         pw.print(" initOrder="); pw.println(info.initOrder);
165             }
166         }
167         if (full) {
168             if (hasExternalProcessHandles()) {
169                 pw.print(prefix); pw.print("externals:");
170                 if (externalProcessTokenToHandle != null) {
171                     pw.print(" w/token=");
172                     pw.print(externalProcessTokenToHandle.size());
173                 }
174                 if (externalProcessNoHandleCount > 0) {
175                     pw.print(" notoken=");
176                     pw.print(externalProcessNoHandleCount);
177                 }
178                 pw.println();
179             }
180         } else {
181             if (connections.size() > 0 || externalProcessNoHandleCount > 0) {
182                 pw.print(prefix); pw.print(connections.size());
183                         pw.print(" connections, "); pw.print(externalProcessNoHandleCount);
184                         pw.println(" external handles");
185             }
186         }
187         if (connections.size() > 0) {
188             if (full) {
189                 pw.print(prefix); pw.println("Connections:");
190             }
191             for (int i=0; i<connections.size(); i++) {
192                 ContentProviderConnection conn = connections.get(i);
193                 pw.print(prefix); pw.print("  -> "); pw.println(conn.toClientString());
194                 if (conn.provider != this) {
195                     pw.print(prefix); pw.print("    *** WRONG PROVIDER: ");
196                             pw.println(conn.provider);
197                 }
198             }
199         }
200     }
201 
202     @Override
toString()203     public String toString() {
204         if (stringName != null) {
205             return stringName;
206         }
207         StringBuilder sb = new StringBuilder(128);
208         sb.append("ContentProviderRecord{");
209         sb.append(Integer.toHexString(System.identityHashCode(this)));
210         sb.append(" u");
211         sb.append(UserHandle.getUserId(uid));
212         sb.append(' ');
213         sb.append(name.flattenToShortString());
214         sb.append('}');
215         return stringName = sb.toString();
216     }
217 
toShortString()218     public String toShortString() {
219         if (shortStringName != null) {
220             return shortStringName;
221         }
222         StringBuilder sb = new StringBuilder(128);
223         sb.append(Integer.toHexString(System.identityHashCode(this)));
224         sb.append('/');
225         sb.append(name.flattenToShortString());
226         return shortStringName = sb.toString();
227     }
228 
229     // This class represents a handle from an external process to a provider.
230     private class ExternalProcessHandle implements DeathRecipient {
231         private static final String LOG_TAG = "ExternalProcessHanldle";
232 
233         private final IBinder mToken;
234         private int mAcquisitionCount;
235 
ExternalProcessHandle(IBinder token)236         public ExternalProcessHandle(IBinder token) {
237             mToken = token;
238             try {
239                 token.linkToDeath(this, 0);
240             } catch (RemoteException re) {
241                 Slog.e(LOG_TAG, "Couldn't register for death for token: " + mToken, re);
242             }
243         }
244 
unlinkFromOwnDeathLocked()245         public void unlinkFromOwnDeathLocked() {
246             mToken.unlinkToDeath(this, 0);
247         }
248 
249         @Override
binderDied()250         public void binderDied() {
251             synchronized (service) {
252                 if (hasExternalProcessHandles() &&
253                         externalProcessTokenToHandle.get(mToken) != null) {
254                     removeExternalProcessHandleInternalLocked(mToken);
255                 }
256             }
257         }
258     }
259 }
260