diff options
Diffstat (limited to 'src/main/java/org/traccar/protocol/At2000ProtocolDecoder.java')
| -rw-r--r-- | src/main/java/org/traccar/protocol/At2000ProtocolDecoder.java | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/src/main/java/org/traccar/protocol/At2000ProtocolDecoder.java b/src/main/java/org/traccar/protocol/At2000ProtocolDecoder.java new file mode 100644 index 000000000..43798eb67 --- /dev/null +++ b/src/main/java/org/traccar/protocol/At2000ProtocolDecoder.java @@ -0,0 +1,171 @@ +/* + * Copyright 2016 - 2018 Anton Tananaev (anton@traccar.org) + * + * 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.DataConverter; +import org.traccar.helper.UnitsConverter; +import org.traccar.model.Position; + +import javax.crypto.Cipher; +import javax.crypto.spec.IvParameterSpec; +import javax.crypto.spec.SecretKeySpec; +import java.net.SocketAddress; +import java.nio.charset.StandardCharsets; +import java.util.Date; +import java.util.LinkedList; +import java.util.List; + +public class At2000ProtocolDecoder extends BaseProtocolDecoder { + + private static final int BLOCK_LENGTH = 16; + + public At2000ProtocolDecoder(Protocol protocol) { + super(protocol); + } + + public static final int MSG_ACKNOWLEDGEMENT = 0x00; + public static final int MSG_DEVICE_ID = 0x01; + public static final int MSG_TRACK_REQUEST = 0x88; + public static final int MSG_TRACK_RESPONSE = 0x89; + public static final int MSG_SESSION_END = 0x0c; + + private Cipher cipher; + + private static void sendRequest(Channel channel) { + if (channel != null) { + ByteBuf response = Unpooled.buffer(BLOCK_LENGTH); + response.writeByte(MSG_TRACK_REQUEST); + response.writeMedium(0); + response.writerIndex(BLOCK_LENGTH); + channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress())); + } + } + + @Override + protected Object decode( + Channel channel, SocketAddress remoteAddress, Object msg) throws Exception { + + ByteBuf buf = (ByteBuf) msg; + + if (buf.getUnsignedByte(buf.readerIndex()) == 0x01) { + buf.readUnsignedByte(); // codec id + } + + int type = buf.readUnsignedByte(); + buf.readUnsignedMediumLE(); // length + buf.skipBytes(BLOCK_LENGTH - 1 - 3); + + if (type == MSG_DEVICE_ID) { + + String imei = buf.readSlice(15).toString(StandardCharsets.US_ASCII); + if (getDeviceSession(channel, remoteAddress, imei) != null) { + + byte[] iv = new byte[BLOCK_LENGTH]; + buf.readBytes(iv); + IvParameterSpec ivSpec = new IvParameterSpec(iv); + + SecretKeySpec keySpec = new SecretKeySpec( + DataConverter.parseHex("000102030405060708090a0b0c0d0e0f"), "AES"); + + cipher = Cipher.getInstance("AES/CBC/NoPadding"); + cipher.init(Cipher.DECRYPT_MODE, keySpec, ivSpec); + + byte[] data = new byte[BLOCK_LENGTH]; + buf.readBytes(data); + cipher.update(data); + + } + + } else if (type == MSG_TRACK_RESPONSE) { + + DeviceSession deviceSession = getDeviceSession(channel, remoteAddress); + if (deviceSession == null) { + return null; + } + + if (buf.capacity() <= BLOCK_LENGTH) { + return null; // empty message + } + + List<Position> positions = new LinkedList<>(); + + byte[] data = new byte[buf.capacity() - BLOCK_LENGTH]; + buf.readBytes(data); + buf = Unpooled.wrappedBuffer(cipher.update(data)); + try { + while (buf.readableBytes() >= 63) { + + Position position = new Position(getProtocolName()); + position.setDeviceId(deviceSession.getDeviceId()); + + buf.readUnsignedShortLE(); // index + buf.readUnsignedShortLE(); // reserved + + position.setValid(true); + + position.setTime(new Date(buf.readLongLE() * 1000)); + + position.setLatitude(buf.readFloatLE()); + position.setLongitude(buf.readFloatLE()); + position.setAltitude(buf.readFloatLE()); + position.setSpeed(UnitsConverter.knotsFromKph(buf.readFloatLE())); + position.setCourse(buf.readFloatLE()); + + buf.readUnsignedIntLE(); // geozone event + buf.readUnsignedIntLE(); // io events + buf.readUnsignedIntLE(); // geozone value + buf.readUnsignedIntLE(); // io values + buf.readUnsignedShortLE(); // operator + + position.set(Position.PREFIX_ADC + 1, buf.readUnsignedShortLE()); + position.set(Position.PREFIX_ADC + 1, buf.readUnsignedShortLE()); + + position.set(Position.KEY_POWER, buf.readUnsignedShortLE() * 0.001); + + buf.readUnsignedShortLE(); // cid + position.set(Position.KEY_RSSI, buf.readUnsignedByte()); + buf.readUnsignedByte(); // current profile + + position.set(Position.KEY_BATTERY, buf.readUnsignedByte()); + position.set(Position.PREFIX_TEMP + 1, buf.readUnsignedByte()); + position.set(Position.KEY_SATELLITES, buf.readUnsignedByte()); + + positions.add(position); + + } + } finally { + buf.release(); + } + + return positions; + + } + + if (type == MSG_DEVICE_ID) { + sendRequest(channel); + } + + return null; + } + +} |