/* * Copyright 2020 Anton Tananaev (anton@traccar.org) * Copyright 2017 Ivan Muratov (binakot@gmail.com) * * 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 org.traccar.protocol; import io.netty.buffer.ByteBuf; import io.netty.buffer.Unpooled; import io.netty.channel.Channel; import org.traccar.BaseProtocolDecoder; import org.traccar.DeviceSession; import org.traccar.NetworkMessage; import org.traccar.Protocol; import org.traccar.helper.Checksum; import org.traccar.model.Position; import java.net.SocketAddress; import java.nio.Buffer; import java.nio.ByteBuffer; import java.util.Date; import java.util.LinkedList; import java.util.List; public class ArnaviBinaryProtocolDecoder extends BaseProtocolDecoder { private static final byte HEADER_START_SIGN = (byte) 0xff; private static final byte HEADER_VERSION_1 = 0x22; private static final byte HEADER_VERSION_2 = 0x23; private static final byte RECORD_PING = 0x00; private static final byte RECORD_DATA = 0x01; private static final byte RECORD_TEXT = 0x03; private static final byte RECORD_FILE = 0x04; private static final byte RECORD_BINARY = 0x06; private static final byte TAG_LATITUDE = 3; private static final byte TAG_LONGITUDE = 4; private static final byte TAG_COORD_PARAMS = 5; public ArnaviBinaryProtocolDecoder(Protocol protocol) { super(protocol); } private void sendResponse(Channel channel, byte version, int index) { if (channel != null) { ByteBuf response = Unpooled.buffer(); response.writeByte(0x7b); if (version == HEADER_VERSION_1) { response.writeByte(0x00); response.writeByte((byte) index); } else if (version == HEADER_VERSION_2) { response.writeByte(0x04); response.writeByte(0x00); ByteBuffer time = ByteBuffer.allocate(4).putInt((int) (System.currentTimeMillis() / 1000)); ((Buffer) time).position(0); response.writeByte(Checksum.modulo256(time.slice())); response.writeBytes(time); } response.writeByte(0x7d); channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress())); } } private Position decodePosition(DeviceSession deviceSession, ByteBuf buf, int length, Date time) { final Position position = new Position(); position.setProtocol(getProtocolName()); position.setDeviceId(deviceSession.getDeviceId()); position.setTime(time); int readBytes = 0; while (readBytes < length) { short tag = buf.readUnsignedByte(); switch (tag) { case TAG_LATITUDE: position.setLatitude(buf.readFloatLE()); position.setValid(true); break; case TAG_LONGITUDE: position.setLongitude(buf.readFloatLE()); position.setValid(true); break; case TAG_COORD_PARAMS: position.setCourse(buf.readUnsignedByte() * 2); position.setAltitude(buf.readUnsignedByte() * 10); byte satellites = buf.readByte(); position.set(Position.KEY_SATELLITES, satellites & 0x0F + (satellites >> 4) & 0x0F); position.setSpeed(buf.readUnsignedByte()); break; default: buf.skipBytes(4); break; } readBytes += 1 + 4; } return position; } @Override protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception { ByteBuf buf = (ByteBuf) msg; byte startSign = buf.readByte(); if (startSign == HEADER_START_SIGN) { byte version = buf.readByte(); String imei = String.valueOf(buf.readLongLE()); DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei); if (deviceSession != null) { sendResponse(channel, version, 0); } return null; } DeviceSession deviceSession = getDeviceSession(channel, remoteAddress); if (deviceSession == null) { return null; } List<Position> positions = new LinkedList<>(); int index = buf.readUnsignedByte(); byte recordType = buf.readByte(); while (buf.readableBytes() > 0) { switch (recordType) { case RECORD_PING: case RECORD_DATA: case RECORD_TEXT: case RECORD_FILE: case RECORD_BINARY: int length = buf.readUnsignedShortLE(); Date time = new Date(buf.readUnsignedIntLE() * 1000); if (recordType == RECORD_DATA) { positions.add(decodePosition(deviceSession, buf, length, time)); } else { buf.readBytes(length); } buf.readUnsignedByte(); // checksum break; default: return null; } recordType = buf.readByte(); } sendResponse(channel, HEADER_VERSION_1, index); return positions; } }