Add raw data forwarding

4 files changed, 147 insertions, 3 deletions

diff --git a/src/main/java/org/traccar/BasePipelineFactory.java b/src/main/java/org/traccar/BasePipelineFactory.java
index 70f999c72..38b077980 100644
--- a/src/main/java/org/traccar/BasePipelineFactory.java
+++ b/src/main/java/org/traccar/BasePipelineFactory.java
@@ -36,6 +36,7 @@ import org.traccar.handler.GeocoderHandler;
 import org.traccar.handler.GeolocationHandler;
 import org.traccar.handler.HemisphereHandler;
 import org.traccar.handler.MotionHandler;
+import org.traccar.handler.NetworkForwarderHandler;
 import org.traccar.handler.NetworkMessageHandler;
 import org.traccar.handler.OpenChannelHandler;
 import org.traccar.handler.RemoteAddressHandler;
@@ -60,15 +61,15 @@ public abstract class BasePipelineFactory extends ChannelInitializer<Channel> {
 
     private final Injector injector;
     private final TrackerConnector connector;
+    private final Config config;
     private final String protocol;
-    private final boolean instantAcknowledgement;
     private final int timeout;
 
     public BasePipelineFactory(TrackerConnector connector, Config config, String protocol) {
         this.injector = Main.getInjector();
         this.connector = connector;
+        this.config = config;
         this.protocol = protocol;
-        instantAcknowledgement = config.getBoolean(Keys.SERVER_INSTANT_ACKNOWLEDGEMENT);
         int timeout = config.getInteger(Keys.PROTOCOL_TIMEOUT.withPrefix(protocol));
         if (timeout == 0) {
             this.timeout = config.getInteger(Keys.SERVER_TIMEOUT);
@@ -115,9 +116,15 @@ public abstract class BasePipelineFactory extends ChannelInitializer<Channel> {
             pipeline.addLast(new IdleStateHandler(timeout, 0, 0));
         }
         pipeline.addLast(new OpenChannelHandler(connector));
+        if (config.hasKey(Keys.SERVER_FORWARD)) {
+            int port = config.getInteger(Keys.PROTOCOL_PORT.withPrefix(protocol));
+            var handler = new NetworkForwarderHandler(port);
+            injector.injectMembers(handler);
+            pipeline.addLast(handler);
+        }
         pipeline.addLast(new NetworkMessageHandler());
         pipeline.addLast(new StandardLoggingHandler(protocol));
-        if (!instantAcknowledgement) {
+        if (!config.getBoolean(Keys.SERVER_INSTANT_ACKNOWLEDGEMENT)) {
             pipeline.addLast(new AcknowledgementHandler());
         }
 
diff --git a/src/main/java/org/traccar/config/Keys.java b/src/main/java/org/traccar/config/Keys.java
index b97acfd66..8ced32153 100644
--- a/src/main/java/org/traccar/config/Keys.java
+++ b/src/main/java/org/traccar/config/Keys.java
@@ -806,6 +806,13 @@ public final class Keys {
             "max-age=3600,public");
 
     /**
+     * Host for raw data forwarding.
+     */
+    public static final ConfigKey<String> SERVER_FORWARD = new StringConfigKey(
+            "server.forward",
+            List.of(KeyType.CONFIG));
+
+    /**
      * Position forwarding format. Available options are "url", "json" and "kafka". Default is "url".
      */
     public static final ConfigKey<String> FORWARD_TYPE = new StringConfigKey(
diff --git a/src/main/java/org/traccar/forward/NetworkForwarder.java b/src/main/java/org/traccar/forward/NetworkForwarder.java
new file mode 100644
index 000000000..6abf2b7ba
--- /dev/null
+++ b/src/main/java/org/traccar/forward/NetworkForwarder.java
@@ -0,0 +1,66 @@
+/*
+ * Copyright 2023 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.forward;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.traccar.config.Config;
+import org.traccar.config.Keys;
+
+import javax.inject.Inject;
+import javax.inject.Singleton;
+import java.io.IOException;
+import java.net.DatagramPacket;
+import java.net.DatagramSocket;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
+import java.net.Socket;
+import java.util.HashMap;
+import java.util.Map;
+
+@Singleton
+public class NetworkForwarder {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(NetworkForwarder.class);
+
+    private final InetAddress destination;
+    private final DatagramSocket connectionUdp;
+    private final Map<InetSocketAddress, Socket> connectionsTcp = new HashMap<>();
+
+    @Inject
+    public NetworkForwarder(Config config) throws IOException {
+        destination = InetAddress.getByName(config.getString(Keys.SERVER_FORWARD));
+        connectionUdp = new DatagramSocket();
+    }
+
+    public void forward(InetSocketAddress source, int port, boolean datagram, byte[] data) {
+        try {
+            if (datagram) {
+                connectionUdp.send(new DatagramPacket(data, data.length, destination, port));
+            } else {
+                Socket connectionTcp = connectionsTcp.get(source);
+                if (connectionTcp == null || connectionTcp.isClosed()) {
+                    connectionTcp = new Socket(destination, port);
+                    connectionsTcp.put(source, connectionTcp);
+                }
+                connectionTcp.getOutputStream().write(data);
+            }
+        } catch (IOException e) {
+            LOGGER.warn("Network forwarding error", e);
+        }
+    }
+
+}
diff --git a/src/main/java/org/traccar/handler/NetworkForwarderHandler.java b/src/main/java/org/traccar/handler/NetworkForwarderHandler.java
new file mode 100644
index 000000000..a3792a3e5
--- /dev/null
+++ b/src/main/java/org/traccar/handler/NetworkForwarderHandler.java
@@ -0,0 +1,64 @@
+/*
+ * Copyright 2023 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.handler;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.channel.ChannelHandlerContext;
+import io.netty.channel.ChannelInboundHandlerAdapter;
+import io.netty.channel.socket.DatagramChannel;
+import io.netty.channel.socket.DatagramPacket;
+import org.traccar.forward.NetworkForwarder;
+
+import javax.inject.Inject;
+import java.net.InetSocketAddress;
+import java.net.SocketAddress;
+
+public class NetworkForwarderHandler extends ChannelInboundHandlerAdapter {
+
+    private final int port;
+
+    private NetworkForwarder networkForwarder;
+
+    public NetworkForwarderHandler(int port) {
+        this.port = port;
+    }
+
+    @Inject
+    public void setNetworkForwarder(NetworkForwarder networkForwarder) {
+        this.networkForwarder = networkForwarder;
+    }
+
+    @Override
+    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
+        boolean datagram = ctx.channel() instanceof DatagramChannel;
+        SocketAddress remoteAddress;
+        ByteBuf buffer;
+        if (datagram) {
+            DatagramPacket message = (DatagramPacket) msg;
+            remoteAddress = message.recipient();
+            buffer = message.content();
+        } else {
+            remoteAddress = ctx.channel().remoteAddress();
+            buffer = (ByteBuf) msg;
+        }
+
+        byte[] data = new byte[buffer.readableBytes()];
+        buffer.getBytes(buffer.readerIndex(), data);
+        networkForwarder.forward((InetSocketAddress) remoteAddress, port, datagram, data);
+        super.channelRead(ctx, msg);
+    }
+
+}