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/*
* Copyright (C) 2015 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.os;
import android.util.Slog;
import com.android.internal.util.FastPrintWriter;
import java.io.FileDescriptor;
import java.io.FileOutputStream;
import java.io.PrintWriter;
/**
* @hide
*/
public abstract class ShellCommand {
static final String TAG = "ShellCommand";
static final boolean DEBUG = false;
private Binder mTarget;
private FileDescriptor mIn;
private FileDescriptor mOut;
private FileDescriptor mErr;
private String[] mArgs;
private ResultReceiver mResultReceiver;
private String mCmd;
private int mArgPos;
private String mCurArgData;
private FastPrintWriter mOutPrintWriter;
private FastPrintWriter mErrPrintWriter;
public int exec(Binder target, FileDescriptor in, FileDescriptor out, FileDescriptor err,
String[] args, ResultReceiver resultReceiver) {
mTarget = target;
mIn = in;
mOut = out;
mErr = err;
mArgs = args;
mResultReceiver = resultReceiver;
mCmd = args != null && args.length > 0 ? args[0] : null;
mArgPos = 1;
mCurArgData = null;
mOutPrintWriter = null;
mErrPrintWriter = null;
if (DEBUG) Slog.d(TAG, "Starting command " + mCmd + " on " + mTarget);
int res = -1;
try {
res = onCommand(mCmd);
if (DEBUG) Slog.d(TAG, "Executed command " + mCmd + " on " + mTarget);
} catch (SecurityException e) {
PrintWriter eout = getErrPrintWriter();
eout.println("Security exception: " + e.getMessage());
eout.println();
e.printStackTrace(eout);
} catch (Throwable e) {
// Unlike usual calls, in this case if an exception gets thrown
// back to us we want to print it back in to the dump data, since
// that is where the caller expects all interesting information to
// go.
PrintWriter eout = getErrPrintWriter();
eout.println();
eout.println("Exception occurred while dumping:");
e.printStackTrace(eout);
} finally {
if (DEBUG) Slog.d(TAG, "Flushing output streams on " + mTarget);
if (mOutPrintWriter != null) {
mOutPrintWriter.flush();
}
if (mErrPrintWriter != null) {
mErrPrintWriter.flush();
}
if (DEBUG) Slog.d(TAG, "Sending command result on " + mTarget);
mResultReceiver.send(res, null);
}
if (DEBUG) Slog.d(TAG, "Finished command " + mCmd + " on " + mTarget);
return res;
}
public PrintWriter getOutPrintWriter() {
if (mOutPrintWriter == null) {
FileOutputStream fout = new FileOutputStream(mOut);
mOutPrintWriter = new FastPrintWriter(fout);
}
return mOutPrintWriter;
}
public PrintWriter getErrPrintWriter() {
if (mErr == null) {
return getOutPrintWriter();
}
if (mErrPrintWriter == null) {
FileOutputStream fout = new FileOutputStream(mErr);
mErrPrintWriter = new FastPrintWriter(fout);
}
return mErrPrintWriter;
}
/**
* Return the next option on the command line -- that is an argument that
* starts with '-'. If the next argument is not an option, null is returned.
*/
public String getNextOption() {
if (mCurArgData != null) {
String prev = mArgs[mArgPos - 1];
throw new IllegalArgumentException("No argument expected after \"" + prev + "\"");
}
if (mArgPos >= mArgs.length) {
return null;
}
String arg = mArgs[mArgPos];
if (!arg.startsWith("-")) {
return null;
}
mArgPos++;
if (arg.equals("--")) {
return null;
}
if (arg.length() > 1 && arg.charAt(1) != '-') {
if (arg.length() > 2) {
mCurArgData = arg.substring(2);
return arg.substring(0, 2);
} else {
mCurArgData = null;
return arg;
}
}
mCurArgData = null;
return arg;
}
/**
* Return the next argument on the command line, whatever it is; if there are
* no arguments left, return null.
*/
public String getNextArg() {
if (mCurArgData != null) {
String arg = mCurArgData;
mCurArgData = null;
return arg;
} else if (mArgPos < mArgs.length) {
return mArgs[mArgPos++];
} else {
return null;
}
}
/**
* Return the next argument on the command line, whatever it is; if there are
* no arguments left, throws an IllegalArgumentException to report this to the user.
*/
public String getNextArgRequired() {
String arg = getNextArg();
if (arg == null) {
String prev = mArgs[mArgPos - 1];
throw new IllegalArgumentException("Argument expected after \"" + prev + "\"");
}
return arg;
}
public int handleDefaultCommands(String cmd) {
if ("dump".equals(cmd)) {
String[] newArgs = new String[mArgs.length-1];
System.arraycopy(mArgs, 1, newArgs, 0, mArgs.length-1);
mTarget.doDump(mOut, getOutPrintWriter(), newArgs);
return 0;
} else if (cmd == null || "help".equals(cmd) || "-h".equals(cmd)) {
onHelp();
} else {
getOutPrintWriter().println("Unknown command: " + cmd);
}
return -1;
}
public abstract int onCommand(String cmd);
public abstract void onHelp();
}
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