Example usage for android.os IBinder dump

Introduction

In this page you can find the example usage for android.os IBinder dump.

Prototype

public void dump(@NonNull FileDescriptor fd, @Nullable String[] args) throws RemoteException;

Source Link

Document

Print the object's state into the given stream.

Usage

From source file:com.github.michalbednarski.intentslab.Utils.java

@TargetApi(13) // Function handles all supported api levels
public static InputStream dumpSystemService(Context context, String serviceName, final String[] arguments)
        throws Exception {
    // Check if we have permission to invoke dump from our process
    final boolean canDumpLocally = context.getPackageManager().checkPermission(android.Manifest.permission.DUMP,
            context.getPackageName()) == PackageManager.PERMISSION_GRANTED;

    // On versions without createPipe() just execute dumpsys
    if (android.os.Build.VERSION.SDK_INT < 9) {
        if (!canDumpLocally) {
            throw new Exception("Dumping is not supported on this system version");
        }//from  w  w w . ja  v a  2 s . c  om
        String[] progArray = new String[arguments != null ? 2 + arguments.length : 2];
        progArray[0] = "dumpsys";
        progArray[1] = serviceName;
        if (arguments != null) {
            System.arraycopy(arguments, 0, progArray, 2, arguments.length);
        }
        return Runtime.getRuntime().exec(progArray).getInputStream();
    }

    // Get service
    final Class<?> serviceManager = Class.forName("android.os.ServiceManager");
    final IBinder service = (IBinder) serviceManager.getMethod("getService", String.class).invoke(null,
            serviceName);

    // Check permissions and get remote interface if needed
    IRemoteInterface remoteInterface = null;
    if (!canDumpLocally) {
        remoteInterface = RunAsManager.getRemoteInterfaceForSystemDebuggingCommands();
        if (remoteInterface == null) {
            throw new SecurityException("Process has no permission to dump services");
        }
    }

    // Create pipe, write(pipe[0]) -> read(pipe[1])
    final ParcelFileDescriptor[] pipe = ParcelFileDescriptor.createPipe();
    final ParcelFileDescriptor readablePipe = pipe[0];
    final ParcelFileDescriptor writablePipe = pipe[1];

    try {
        // Execute dump
        if (canDumpLocally) {
            if (android.os.Build.VERSION.SDK_INT >= 13) {
                service.dumpAsync(writablePipe.getFileDescriptor(), arguments);
                writablePipe.close();
            } else {
                (new Thread() {
                    @Override
                    public void run() {
                        try {
                            service.dump(writablePipe.getFileDescriptor(), arguments);
                            writablePipe.close();
                        } catch (Exception e) {
                            // TODO: can we handle this?
                            e.printStackTrace();
                        }
                    }
                }).start();
            }
        } else {
            remoteInterface.dumpServiceAsync(service, writablePipe, arguments);
            writablePipe.close();
        }
        // If anything went wrong, close pipe and rethrow
    } catch (Throwable e) {
        readablePipe.close();
        writablePipe.close();
        throwUnchecked(e);
        throw new Error(); // Unreachable
    }

    // Return stream that will ensure closing fd
    return new FileInputStream(readablePipe.getFileDescriptor()) {
        @Override
        public void close() throws IOException {
            super.close();
            readablePipe.close();
        }
    };
}

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