Implement Teltonika AT200 protocol

3 files changed, 233 insertions, 0 deletions

diff --git a/src/org/traccar/protocol/At2000FrameDecoder.java b/src/org/traccar/protocol/At2000FrameDecoder.java
new file mode 100644
index 000000000..d0be3f5f4
--- /dev/null
+++ b/src/org/traccar/protocol/At2000FrameDecoder.java
@@ -0,0 +1,57 @@
+/*
+ * Copyright 2016 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 org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.channel.Channel;
+import org.jboss.netty.channel.ChannelHandlerContext;
+import org.jboss.netty.handler.codec.frame.FrameDecoder;
+
+public class At2000FrameDecoder extends FrameDecoder {
+
+    private static final int BLOCK_LENGTH = 16;
+
+    private boolean firstPacket = true;
+
+    @Override
+    protected Object decode(
+            ChannelHandlerContext ctx, Channel channel, ChannelBuffer buf) throws Exception {
+
+        if (buf.readableBytes() < 5) {
+            return null;
+        }
+
+        int length;
+        if (firstPacket) {
+            firstPacket = false;
+            length = buf.getUnsignedMedium(buf.readerIndex() + 2);
+        } else {
+            length = buf.getUnsignedMedium(buf.readerIndex() + 1);
+        }
+
+        length += BLOCK_LENGTH;
+        if (length % BLOCK_LENGTH != 0) {
+            length = (length / BLOCK_LENGTH + 1) * BLOCK_LENGTH;
+        }
+
+        if (buf.readableBytes() >= length) {
+            return buf.readBytes(length);
+        }
+
+        return null;
+    }
+
+}
diff --git a/src/org/traccar/protocol/At2000Protocol.java b/src/org/traccar/protocol/At2000Protocol.java
new file mode 100644
index 000000000..418619cb4
--- /dev/null
+++ b/src/org/traccar/protocol/At2000Protocol.java
@@ -0,0 +1,42 @@
+/*
+ * Copyright 2016 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 org.jboss.netty.bootstrap.ServerBootstrap;
+import org.jboss.netty.channel.ChannelPipeline;
+import org.traccar.BaseProtocol;
+import org.traccar.TrackerServer;
+
+import java.util.List;
+
+public class At2000Protocol extends BaseProtocol {
+
+    public At2000Protocol() {
+        super("at2000");
+    }
+
+    @Override
+    public void initTrackerServers(List<TrackerServer> serverList) {
+        serverList.add(new TrackerServer(new ServerBootstrap(), getName()) {
+            @Override
+            protected void addSpecificHandlers(ChannelPipeline pipeline) {
+                pipeline.addLast("frameDecoder", new At2000FrameDecoder());
+                pipeline.addLast("objectDecoder", new At2000ProtocolDecoder(At2000Protocol.this));
+            }
+        });
+    }
+
+}
diff --git a/src/org/traccar/protocol/At2000ProtocolDecoder.java b/src/org/traccar/protocol/At2000ProtocolDecoder.java
new file mode 100644
index 000000000..17da0eef7
--- /dev/null
+++ b/src/org/traccar/protocol/At2000ProtocolDecoder.java
@@ -0,0 +1,134 @@
+/*
+ * Copyright 2016 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 org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.buffer.ChannelBuffers;
+import org.jboss.netty.channel.Channel;
+import org.traccar.BaseProtocolDecoder;
+import org.traccar.DeviceSession;
+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 javax.xml.bind.DatatypeConverter;
+import java.net.SocketAddress;
+import java.nio.ByteOrder;
+import java.nio.charset.StandardCharsets;
+import java.util.Date;
+
+public class At2000ProtocolDecoder extends BaseProtocolDecoder {
+
+    private static final int BLOCK_LENGTH = 16;
+
+    public At2000ProtocolDecoder(At2000Protocol 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 sendResponse(Channel channel) {
+        if (channel != null) {
+            ChannelBuffer response = ChannelBuffers.directBuffer(BLOCK_LENGTH);
+            response.writeByte(MSG_ACKNOWLEDGEMENT);
+            response.writeMedium(1);
+            response.writeByte(0x00); // success
+            response.writerIndex(BLOCK_LENGTH);
+            channel.write(response);
+        }
+    }
+
+    @Override
+    protected Object decode(
+            Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
+
+        ChannelBuffer buf = (ChannelBuffer) msg;
+
+        if (buf.getUnsignedByte(buf.readerIndex()) == 0x01) {
+            buf.readUnsignedByte(); // codec id
+        }
+
+        int type = buf.readUnsignedByte();
+        buf.readUnsignedMedium(); // length
+        buf.skipBytes(BLOCK_LENGTH - 1 - 3);
+
+        if (type == MSG_DEVICE_ID) {
+
+            String imei = buf.readBytes(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(
+                        DatatypeConverter.parseHexBinary("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;
+            }
+
+            Position position = new Position();
+            position.setProtocol(getProtocolName());
+            position.setDeviceId(deviceSession.getDeviceId());
+
+            byte[] data = new byte[buf.capacity() - BLOCK_LENGTH];
+            buf.readBytes(data);
+            buf = ChannelBuffers.wrappedBuffer(ByteOrder.LITTLE_ENDIAN, cipher.update(data));
+
+            buf.readUnsignedShort(); // index
+            buf.readUnsignedShort(); // reserved
+
+            position.setValid(true);
+
+            position.setTime(new Date(buf.readLong() * 1000));
+
+            position.setLatitude(buf.readFloat());
+            position.setLongitude(buf.readFloat());
+            position.setAltitude(buf.readFloat());
+            position.setSpeed(UnitsConverter.knotsFromKph(buf.readFloat()));
+            position.setCourse(buf.readFloat());
+
+            return position;
+
+        }
+
+        sendResponse(channel);
+
+        return null;
+    }
+
+}