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/*
* 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 jakarta.inject.Inject;
import jakarta.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);
}
}
public void disconnect(InetSocketAddress source) {
Socket connectionTcp = connectionsTcp.remove(source);
if (connectionTcp != null) {
try {
connectionTcp.close();
} catch (IOException e) {
LOGGER.warn("Connection close error", e);
}
}
}
}
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