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/*
* Copyright (C) 2017 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.wifi.aware;
import android.os.Binder;
import android.os.ShellCommand;
import android.text.TextUtils;
import android.util.Log;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;
/**
* Interprets and executes 'adb shell cmd wifiaware [args]'.
*/
public class WifiAwareShellCommand extends ShellCommand {
private static final String TAG = "WifiAwareShellCommand";
private Map<String, DelegatedShellCommand> mDelegatedCommands = new HashMap<>();
/**
* Register an delegated command interpreter for the specified 'command'. Each class can
* interpret and execute their own commands.
*/
public void register(String command, DelegatedShellCommand shellCommand) {
if (mDelegatedCommands.containsKey(command)) {
Log.e(TAG, "register: overwriting existing command -- '" + command + "'");
}
mDelegatedCommands.put(command, shellCommand);
}
@Override
public int onCommand(String cmd) {
checkRootPermission();
final PrintWriter pw = getErrPrintWriter();
try {
if ("reset".equals(cmd)) {
for (DelegatedShellCommand dsc: mDelegatedCommands.values()) {
dsc.onReset();
}
} else {
DelegatedShellCommand delegatedCmd = null;
if (!TextUtils.isEmpty(cmd)) {
delegatedCmd = mDelegatedCommands.get(cmd);
}
if (delegatedCmd != null) {
return delegatedCmd.onCommand(this);
} else {
return handleDefaultCommands(cmd);
}
}
} catch (Exception e) {
pw.println("Exception: " + e);
}
return -1;
}
private void checkRootPermission() {
final int uid = Binder.getCallingUid();
if (uid == 0) {
// Root can do anything.
return;
}
throw new SecurityException("Uid " + uid + " does not have access to wifiaware commands");
}
@Override
public void onHelp() {
final PrintWriter pw = getOutPrintWriter();
pw.println("Wi-Fi Aware (wifiaware) commands:");
pw.println(" help");
pw.println(" Print this help text.");
pw.println(" reset");
pw.println(" Reset parameters to default values.");
for (Map.Entry<String, DelegatedShellCommand> sce: mDelegatedCommands.entrySet()) {
sce.getValue().onHelp(sce.getKey(), this);
}
pw.println();
}
/**
* Interface that delegated command targets must implement. They are passed the parent shell
* command (the real command interpreter) from which they can obtain arguments.
*/
public interface DelegatedShellCommand {
/**
* Execute the specified command. Use the parent shell to obtain arguments. Note that the
* first argument (which specified the delegated shell) has already been extracted.
*/
int onCommand(ShellCommand parentShell);
/**
* Reset all parameters to their default values.
*/
void onReset();
/**
* Print out help for the delegated command. The name of the delegated command is passed
* as a first argument as an assist (prevents hard-coding of that string in multiple
* places).
*/
void onHelp(String command, ShellCommand parentShell);
}
}
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