1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
|
/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.internal.os;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import android.os.Binder;
import android.os.IBinder;
import android.os.IInterface;
import android.os.ParcelFileDescriptor;
import android.os.RemoteException;
import android.os.SystemClock;
import android.util.Slog;
/**
* Helper for transferring data through a pipe from a client app.
*/
public final class TransferPipe implements Runnable {
static final String TAG = "TransferPipe";
static final boolean DEBUG = false;
static final long DEFAULT_TIMEOUT = 5000; // 5 seconds
final Thread mThread;;
final ParcelFileDescriptor[] mFds;
FileDescriptor mOutFd;
long mEndTime;
String mFailure;
boolean mComplete;
String mBufferPrefix;
interface Caller {
void go(IInterface iface, FileDescriptor fd, String prefix,
String[] args) throws RemoteException;
}
public TransferPipe() throws IOException {
mThread = new Thread(this, "TransferPipe");
mFds = ParcelFileDescriptor.createPipe();
}
ParcelFileDescriptor getReadFd() {
return mFds[0];
}
public ParcelFileDescriptor getWriteFd() {
return mFds[1];
}
public void setBufferPrefix(String prefix) {
mBufferPrefix = prefix;
}
static void go(Caller caller, IInterface iface, FileDescriptor out,
String prefix, String[] args) throws IOException, RemoteException {
go(caller, iface, out, prefix, args, DEFAULT_TIMEOUT);
}
static void go(Caller caller, IInterface iface, FileDescriptor out,
String prefix, String[] args, long timeout) throws IOException, RemoteException {
if ((iface.asBinder()) instanceof Binder) {
// This is a local object... just call it directly.
try {
caller.go(iface, out, prefix, args);
} catch (RemoteException e) {
}
return;
}
TransferPipe tp = new TransferPipe();
try {
caller.go(iface, tp.getWriteFd().getFileDescriptor(), prefix, args);
tp.go(out, timeout);
} finally {
tp.kill();
}
}
static void goDump(IBinder binder, FileDescriptor out,
String[] args) throws IOException, RemoteException {
goDump(binder, out, args, DEFAULT_TIMEOUT);
}
static void goDump(IBinder binder, FileDescriptor out,
String[] args, long timeout) throws IOException, RemoteException {
if (binder instanceof Binder) {
// This is a local object... just call it directly.
try {
binder.dump(out, args);
} catch (RemoteException e) {
}
return;
}
TransferPipe tp = new TransferPipe();
try {
binder.dumpAsync(tp.getWriteFd().getFileDescriptor(), args);
tp.go(out, timeout);
} finally {
tp.kill();
}
}
public void go(FileDescriptor out) throws IOException {
go(out, DEFAULT_TIMEOUT);
}
public void go(FileDescriptor out, long timeout) throws IOException {
try {
synchronized (this) {
mOutFd = out;
mEndTime = SystemClock.uptimeMillis() + timeout;
if (DEBUG) Slog.i(TAG, "read=" + getReadFd() + " write=" + getWriteFd()
+ " out=" + out);
// Close the write fd, so we know when the other side is done.
closeFd(1);
mThread.start();
while (mFailure == null && !mComplete) {
long waitTime = mEndTime - SystemClock.uptimeMillis();
if (waitTime <= 0) {
if (DEBUG) Slog.i(TAG, "TIMEOUT!");
mThread.interrupt();
throw new IOException("Timeout");
}
try {
wait(waitTime);
} catch (InterruptedException e) {
}
}
if (DEBUG) Slog.i(TAG, "Finished: " + mFailure);
if (mFailure != null) {
throw new IOException(mFailure);
}
}
} finally {
kill();
}
}
void closeFd(int num) {
if (mFds[num] != null) {
if (DEBUG) Slog.i(TAG, "Closing: " + mFds[num]);
try {
mFds[num].close();
} catch (IOException e) {
}
mFds[num] = null;
}
}
public void kill() {
synchronized (this) {
closeFd(0);
closeFd(1);
}
}
@Override
public void run() {
final byte[] buffer = new byte[1024];
final FileInputStream fis;
final FileOutputStream fos;
synchronized (this) {
ParcelFileDescriptor readFd = getReadFd();
if (readFd == null) {
Slog.w(TAG, "Pipe has been closed...");
return;
}
fis = new FileInputStream(readFd.getFileDescriptor());
fos = new FileOutputStream(mOutFd);
}
if (DEBUG) Slog.i(TAG, "Ready to read pipe...");
byte[] bufferPrefix = null;
boolean needPrefix = true;
if (mBufferPrefix != null) {
bufferPrefix = mBufferPrefix.getBytes();
}
int size;
try {
while ((size=fis.read(buffer)) > 0) {
if (DEBUG) Slog.i(TAG, "Got " + size + " bytes");
if (bufferPrefix == null) {
fos.write(buffer, 0, size);
} else {
int start = 0;
for (int i=0; i<size; i++) {
if (buffer[i] != '\n') {
if (i > start) {
fos.write(buffer, start, i-start);
}
start = i;
if (needPrefix) {
fos.write(bufferPrefix);
needPrefix = false;
}
do {
i++;
} while (i<size && buffer[i] != '\n');
if (i < size) {
needPrefix = true;
}
}
}
if (size > start) {
fos.write(buffer, start, size-start);
}
}
}
if (DEBUG) Slog.i(TAG, "End of pipe: size=" + size);
if (mThread.isInterrupted()) {
if (DEBUG) Slog.i(TAG, "Interrupted!");
}
} catch (IOException e) {
synchronized (this) {
mFailure = e.toString();
notifyAll();
return;
}
}
synchronized (this) {
mComplete = true;
notifyAll();
}
}
}
|