--- /dev/null
+/*
+ * Copyright (C) 2014 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.hdmi;
+
+import android.hardware.hdmi.HdmiCecDeviceInfo;
+import android.util.Slog;
+import android.util.SparseArray;
+
+/**
+ * A helper class to validates {@link HdmiCecMessage}.
+ */
+public final class HdmiCecMessageValidator {
+ private static final String TAG = "HdmiCecMessageValidator";
+
+ private final HdmiControlService mService;
+
+ interface ParameterValidator {
+ boolean isValid(byte[] params);
+ }
+
+ final SparseArray<ParameterValidator> mValidators = new SparseArray<>();
+
+ public HdmiCecMessageValidator(HdmiControlService service) {
+ mService = service;
+
+ // Messages related to the physical address.
+ PhysicalAddressValidator physicalAddressValidator = new PhysicalAddressValidator();
+ mValidators.append(Constants.MESSAGE_ACTIVE_SOURCE, physicalAddressValidator);
+ mValidators.append(Constants.MESSAGE_INACTIVE_SOURCE, physicalAddressValidator);
+ mValidators.append(Constants.MESSAGE_REPORT_PHYSICAL_ADDRESS,
+ new ReportPhysicalAddressValidator());
+ mValidators.append(Constants.MESSAGE_ROUTING_CHANGE, new RoutingChangeValidator());
+ mValidators.append(Constants.MESSAGE_ROUTING_INFORMATION, physicalAddressValidator);
+ mValidators.append(Constants.MESSAGE_SET_STREAM_PATH, physicalAddressValidator);
+ mValidators.append(Constants.MESSAGE_SYSTEM_AUDIO_MODE_REQUEST, physicalAddressValidator);
+
+ // Messages have no parameter.
+ FixedLengthValidator noneValidator = new FixedLengthValidator(0);
+ mValidators.append(Constants.MESSAGE_ABORT, noneValidator);
+ mValidators.append(Constants.MESSAGE_GET_CEC_VERSION, noneValidator);
+ mValidators.append(Constants.MESSAGE_GET_MENU_LANGUAGE, noneValidator);
+ mValidators.append(Constants.MESSAGE_GIVE_AUDIO_STATUS, noneValidator);
+ mValidators.append(Constants.MESSAGE_GIVE_DEVICE_POWER_STATUS, noneValidator);
+ mValidators.append(Constants.MESSAGE_GIVE_DEVICE_VENDOR_ID, noneValidator);
+ mValidators.append(Constants.MESSAGE_GIVE_OSD_NAME, noneValidator);
+ mValidators.append(Constants.MESSAGE_GIVE_PHYSICAL_ADDRESS, noneValidator);
+ mValidators.append(Constants.MESSAGE_GIVE_SYSTEM_AUDIO_MODE_STATUS, noneValidator);
+ mValidators.append(Constants.MESSAGE_IMAGE_VIEW_ON, noneValidator);
+ mValidators.append(Constants.MESSAGE_INITIATE_ARC, noneValidator);
+ mValidators.append(Constants.MESSAGE_RECORD_OFF, noneValidator);
+ mValidators.append(Constants.MESSAGE_RECORD_TV_SCREEN, noneValidator);
+ mValidators.append(Constants.MESSAGE_REPORT_ARC_INITIATED, noneValidator);
+ mValidators.append(Constants.MESSAGE_REPORT_ARC_TERMINATED, noneValidator);
+ mValidators.append(Constants.MESSAGE_REQUEST_ARC_INITIATION, noneValidator);
+ mValidators.append(Constants.MESSAGE_REQUEST_ARC_TERMINATION, noneValidator);
+ mValidators.append(Constants.MESSAGE_REQUEST_ACTIVE_SOURCE, noneValidator);
+ mValidators.append(Constants.MESSAGE_STANDBY, noneValidator);
+ mValidators.append(Constants.MESSAGE_TERMINATE_ARC, noneValidator);
+ mValidators.append(Constants.MESSAGE_TEXT_VIEW_ON, noneValidator);
+ mValidators.append(Constants.MESSAGE_TUNER_STEP_DECREMENT, noneValidator);
+ mValidators.append(Constants.MESSAGE_TUNER_STEP_INCREMENT, noneValidator);
+ mValidators.append(Constants.MESSAGE_USER_CONTROL_RELEASED, noneValidator);
+ mValidators.append(Constants.MESSAGE_VENDOR_REMOTE_BUTTON_UP, noneValidator);
+
+ // TODO: Validate more than length for the following messages.
+
+ // Messages for the One Touch Record.
+ FixedLengthValidator oneByteValidator = new FixedLengthValidator(1);
+ mValidators.append(Constants.MESSAGE_RECORD_ON, new VariableLengthValidator(1, 8));
+ mValidators.append(Constants.MESSAGE_RECORD_STATUS, oneByteValidator);
+
+ // TODO: Handle messages for the Timer Programming.
+
+ // Messages for the System Information.
+ mValidators.append(Constants.MESSAGE_CEC_VERSION, oneByteValidator);
+ mValidators.append(Constants.MESSAGE_SET_MENU_LANGUAGE, new FixedLengthValidator(3));
+
+ // TODO: Handle messages for the Deck Control.
+
+ // TODO: Handle messages for the Tuner Control.
+
+ // Messages for the Vendor Specific Commands.
+ VariableLengthValidator maxLengthValidator = new VariableLengthValidator(0, 14);
+ mValidators.append(Constants.MESSAGE_DEVICE_VENDOR_ID, new FixedLengthValidator(3));
+ mValidators.append(Constants.MESSAGE_VENDOR_COMMAND, maxLengthValidator);
+ mValidators.append(Constants.MESSAGE_VENDOR_COMMAND_WITH_ID, maxLengthValidator);
+ mValidators.append(Constants.MESSAGE_VENDOR_REMOTE_BUTTON_DOWN, maxLengthValidator);
+
+ // Messages for the OSD.
+ mValidators.append(Constants.MESSAGE_SET_OSD_STRING, maxLengthValidator);
+ mValidators.append(Constants.MESSAGE_SET_OSD_NAME, maxLengthValidator);
+
+ // TODO: Handle messages for the Device Menu Control.
+
+ // Messages for the Remote Control Passthrough.
+ // TODO: Parse the first parameter and determine if it can have the next parameter.
+ mValidators.append(Constants.MESSAGE_USER_CONTROL_PRESSED,
+ new VariableLengthValidator(1, 2));
+
+ // Messages for the Power Status.
+ mValidators.append(Constants.MESSAGE_REPORT_POWER_STATUS, oneByteValidator);
+
+ // Messages for the General Protocol.
+ mValidators.append(Constants.MESSAGE_FEATURE_ABORT, new FixedLengthValidator(2));
+
+ // Messages for the System Audio Control.
+ mValidators.append(Constants.MESSAGE_REPORT_AUDIO_STATUS, oneByteValidator);
+ mValidators.append(Constants.MESSAGE_REPORT_SHORT_AUDIO_DESCRIPTOR,
+ new FixedLengthValidator(3));
+ mValidators.append(Constants.MESSAGE_REQUEST_SHORT_AUDIO_DESCRIPTOR, oneByteValidator);
+ mValidators.append(Constants.MESSAGE_SET_SYSTEM_AUDIO_MODE, oneByteValidator);
+ mValidators.append(Constants.MESSAGE_SYSTEM_AUDIO_MODE_STATUS, oneByteValidator);
+
+ // Messages for the Audio Rate Control.
+ mValidators.append(Constants.MESSAGE_SET_AUDIO_RATE, oneByteValidator);
+
+ // All Messages for the ARC have no parameters.
+
+ // Messages for the Capability Discovery and Control.
+ mValidators.append(Constants.MESSAGE_CDC_MESSAGE, maxLengthValidator);
+ }
+
+ boolean isValid(HdmiCecMessage message) {
+ int opcode = message.getOpcode();
+ ParameterValidator validator = mValidators.get(opcode);
+ if (validator == null) {
+ Slog.i(TAG, "No validator for the message: " + message);
+ return true;
+ }
+ return validator.isValid(message.getParams());
+ }
+
+ private static class FixedLengthValidator implements ParameterValidator {
+ private final int mLength;
+
+ public FixedLengthValidator(int length) {
+ mLength = length;
+ }
+
+ @Override
+ public boolean isValid(byte[] params) {
+ return params.length == mLength;
+ }
+ }
+
+ private static class VariableLengthValidator implements ParameterValidator {
+ private final int mMinLength;
+ private final int mMaxLength;
+
+ public VariableLengthValidator(int minLength, int maxLength) {
+ mMinLength = minLength;
+ mMaxLength = maxLength;
+ }
+
+ @Override
+ public boolean isValid(byte[] params) {
+ return params.length >= mMinLength && params.length <= mMaxLength;
+ }
+ }
+
+ private boolean isValidPhysicalAddress(byte[] params, int offset) {
+ int path = HdmiUtils.twoBytesToInt(params, offset);
+ int portId = mService.pathToPortId(path);
+ if (portId == Constants.INVALID_PORT_ID) {
+ return false;
+ }
+ // TODO: Add more logic like validating 1.0.1.0.
+ return true;
+ }
+
+ /**
+ * Check if the given type is valid. A valid type is one of the actual
+ * logical device types defined in the standard ({@link #DEVICE_TV},
+ * {@link #DEVICE_PLAYBACK}, {@link #DEVICE_TUNER}, {@link #DEVICE_RECORDER},
+ * and {@link #DEVICE_AUDIO_SYSTEM}).
+ *
+ * @param type device type
+ * @return true if the given type is valid
+ */
+ static boolean isValidType(int type) {
+ return (HdmiCecDeviceInfo.DEVICE_TV <= type
+ && type <= HdmiCecDeviceInfo.DEVICE_VIDEO_PROCESSOR)
+ && type != HdmiCecDeviceInfo.DEVICE_RESERVED;
+ }
+
+ private class PhysicalAddressValidator implements ParameterValidator {
+ @Override
+ public boolean isValid(byte[] params) {
+ if (params.length != 2) {
+ return false;
+ }
+ return isValidPhysicalAddress(params, 0);
+ }
+ }
+
+ private class ReportPhysicalAddressValidator implements ParameterValidator {
+ @Override
+ public boolean isValid(byte[] params) {
+ if (params.length != 3) {
+ return false;
+ }
+ return isValidPhysicalAddress(params, 0) && isValidType(params[2]);
+ }
+ }
+
+ private class RoutingChangeValidator implements ParameterValidator {
+ @Override
+ public boolean isValid(byte[] params) {
+ if (params.length != 4) {
+ return false;
+ }
+ return isValidPhysicalAddress(params, 0) && isValidPhysicalAddress(params, 2);
+ }
+ }
+}
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