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/*
* Copyright (C) 2022 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.server.bluetooth;
import static java.util.Objects.requireNonNull;
import android.bluetooth.BluetoothAdapter;
import android.content.AttributionSource;
import android.content.Context;
import android.os.Binder;
import android.os.Process;
import android.os.RemoteException;
import android.util.Log;
import com.android.internal.annotations.VisibleForTesting;
import com.android.modules.utils.BasicShellCommandHandler;
import java.io.PrintWriter;
class BluetoothShellCommand extends BasicShellCommandHandler {
private static final String TAG = BluetoothShellCommand.class.getSimpleName();
private final BluetoothManagerService mManagerService;
private final Context mContext;
@VisibleForTesting
final BluetoothCommand[] mBluetoothCommands = {
new Enable(),
new Disable(),
new WaitForAdapterState(),
};
@VisibleForTesting
abstract class BluetoothCommand {
final boolean mIsPrivileged;
final String mName;
BluetoothCommand(boolean isPrivileged, String name) {
mIsPrivileged = isPrivileged;
mName = requireNonNull(name, "Command name cannot be null");
}
String getName() {
return mName;
}
boolean isMatch(String cmd) {
return mName.equals(cmd);
}
boolean isPrivileged() {
return mIsPrivileged;
}
abstract int exec(String cmd) throws RemoteException;
abstract void onHelp(PrintWriter pw);
}
@VisibleForTesting
class Enable extends BluetoothCommand {
Enable() {
super(false, "enable");
}
@Override
public int exec(String cmd) throws RemoteException {
return mManagerService.enable(AttributionSource.myAttributionSource()) ? 0 : -1;
}
@Override
public void onHelp(PrintWriter pw) {
pw.println(" " + getName());
pw.println(" Enable Bluetooth on this device.");
}
}
@VisibleForTesting
class Disable extends BluetoothCommand {
Disable() {
super(false, "disable");
}
@Override
public int exec(String cmd) throws RemoteException {
return mManagerService.disable(AttributionSource.myAttributionSource(), true) ? 0 : -1;
}
@Override
public void onHelp(PrintWriter pw) {
pw.println(" " + getName());
pw.println(" Disable Bluetooth on this device.");
}
}
@VisibleForTesting
class WaitForAdapterState extends BluetoothCommand {
WaitForAdapterState() {
super(false, "wait-for-state");
}
private int getWaitingState(String in) {
if (!in.startsWith(getName() + ":")) return -1;
String[] split = in.split(":", 2);
if (split.length != 2 || !getName().equals(split[0])) {
String msg = getName() + ": Invalid state format: " + in;
Log.e(TAG, msg);
PrintWriter pw = getErrPrintWriter();
pw.println(TAG + ": " + msg);
printHelp(pw);
throw new IllegalArgumentException();
}
switch (split[1]) {
case "STATE_OFF":
return BluetoothAdapter.STATE_OFF;
case "STATE_ON":
return BluetoothAdapter.STATE_ON;
default:
String msg = getName() + ": Invalid state value: " + split[1] + ". From: " + in;
Log.e(TAG, msg);
PrintWriter pw = getErrPrintWriter();
pw.println(TAG + ": " + msg);
printHelp(pw);
throw new IllegalArgumentException();
}
}
@Override
boolean isMatch(String cmd) {
return getWaitingState(cmd) != -1;
}
@Override
public int exec(String cmd) throws RemoteException {
int ret = mManagerService.waitForManagerState(getWaitingState(cmd)) ? 0 : -1;
Log.d(TAG, cmd + ": Return value is " + ret); // logging as this method can take time
return ret;
}
@Override
public void onHelp(PrintWriter pw) {
pw.println(" " + getName() + ":<STATE>");
pw.println(" Wait until the adapter state is <STATE>."
+ " <STATE> can be one of STATE_OFF | STATE_ON");
pw.println(" Note: This command can timeout and failed");
}
}
BluetoothShellCommand(BluetoothManagerService managerService, Context context) {
mManagerService = managerService;
mContext = context;
}
@Override
public int onCommand(String cmd) {
if (cmd == null) return handleDefaultCommands(null);
for (BluetoothCommand bt_cmd : mBluetoothCommands) {
if (!bt_cmd.isMatch(cmd)) continue;
if (bt_cmd.isPrivileged()) {
final int uid = Binder.getCallingUid();
if (uid != Process.ROOT_UID) {
throw new SecurityException("Uid " + uid + " does not have access to "
+ cmd + " bluetooth command");
}
}
try {
getOutPrintWriter().println(TAG + ": Exec" + cmd);
Log.d(TAG, "Exec " + cmd);
int ret = bt_cmd.exec(cmd);
if (ret == 0) {
String msg = cmd + ": Success";
Log.d(TAG, msg);
getOutPrintWriter().println(msg);
} else {
String msg = cmd + ": Failed with status=" + ret;
Log.e(TAG, msg);
getErrPrintWriter().println(TAG + ": " + msg);
}
return ret;
} catch (RemoteException e) {
Log.w(TAG, cmd + ": error\nException: " + e.getMessage());
getErrPrintWriter().println(cmd + ": error\nException: " + e.getMessage());
e.rethrowFromSystemServer();
}
}
return handleDefaultCommands(cmd);
}
private void printHelp(PrintWriter pw) {
pw.println("Bluetooth Manager Commands:");
pw.println(" help or -h");
pw.println(" Print this help text.");
for (BluetoothCommand bt_cmd : mBluetoothCommands) {
bt_cmd.onHelp(pw);
}
}
@Override
public void onHelp() {
printHelp(getOutPrintWriter());
}
}
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