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/*
* Copyright (C) 2009 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 android.security;
import android.net.LocalSocketAddress;
import android.net.LocalSocket;
import android.util.Config;
import android.util.Log;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
/*
* ServiceCommand is used to connect to a service throught the local socket,
* and send out the command, return the result to the caller.
* {@hide}
*/
public class ServiceCommand {
public static final String SUCCESS = "0";
public static final String FAILED = "-1";
private String mServiceName;
private String mTag;
private InputStream mIn;
private OutputStream mOut;
private LocalSocket mSocket;
private static final int BUFFER_LENGTH = 1024;
private byte buf[] = new byte[BUFFER_LENGTH];
private int buflen = 0;
private boolean connect() {
if (mSocket != null) {
return true;
}
Log.i(mTag, "connecting...");
try {
mSocket = new LocalSocket();
LocalSocketAddress address = new LocalSocketAddress(
mServiceName, LocalSocketAddress.Namespace.RESERVED);
mSocket.connect(address);
mIn = mSocket.getInputStream();
mOut = mSocket.getOutputStream();
} catch (IOException ex) {
disconnect();
return false;
}
return true;
}
private void disconnect() {
Log.i(mTag,"disconnecting...");
try {
if (mSocket != null) mSocket.close();
} catch (IOException ex) { }
try {
if (mIn != null) mIn.close();
} catch (IOException ex) { }
try {
if (mOut != null) mOut.close();
} catch (IOException ex) { }
mSocket = null;
mIn = null;
mOut = null;
}
private boolean readBytes(byte buffer[], int len) {
int off = 0, count;
if (len < 0) return false;
while (off != len) {
try {
count = mIn.read(buffer, off, len - off);
if (count <= 0) {
Log.e(mTag, "read error " + count);
break;
}
off += count;
} catch (IOException ex) {
Log.e(mTag,"read exception");
break;
}
}
if (off == len) return true;
disconnect();
return false;
}
private boolean readReply() {
int len, ret;
buflen = 0;
if (!readBytes(buf, 2)) return false;
ret = (((int) buf[0]) & 0xff) | ((((int) buf[1]) & 0xff) << 8);
if (ret != 0) return false;
if (!readBytes(buf, 2)) return false;
len = (((int) buf[0]) & 0xff) | ((((int) buf[1]) & 0xff) << 8);
if (len > BUFFER_LENGTH) {
Log.e(mTag,"invalid reply length (" + len + ")");
disconnect();
return false;
}
if (!readBytes(buf, len)) return false;
buflen = len;
return true;
}
private boolean writeCommand(String _cmd) {
byte[] cmd = _cmd.getBytes();
int len = cmd.length;
if ((len < 1) || (len > BUFFER_LENGTH)) return false;
buf[0] = (byte) (len & 0xff);
buf[1] = (byte) ((len >> 8) & 0xff);
try {
mOut.write(buf, 0, 2);
mOut.write(cmd, 0, len);
} catch (IOException ex) {
Log.e(mTag,"write error");
disconnect();
return false;
}
return true;
}
private String executeCommand(String cmd) {
if (!writeCommand(cmd)) {
/* If service died and restarted in the background
* (unlikely but possible) we'll fail on the next
* write (this one). Try to reconnect and write
* the command one more time before giving up.
*/
Log.e(mTag, "write command failed? reconnect!");
if (!connect() || !writeCommand(cmd)) {
return null;
}
}
if (readReply()) {
return new String(buf, 0, buflen);
} else {
return null;
}
}
public synchronized String execute(String cmd) {
String result;
if (!connect()) {
Log.e(mTag, "connection failed");
return null;
}
result = executeCommand(cmd);
disconnect();
return result;
}
public ServiceCommand(String service) {
mServiceName = service;
mTag = service;
}
}
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