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PingPongSocketClient.java
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PingPongSocketClient.java
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// Copyright 2023 ETH Zurich
//
// 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.scion.jpan.demo;
import java.io.IOException;
import java.net.*;
import org.scion.jpan.ScionDatagramSocket;
import org.scion.jpan.testutil.MockDNS;
/**
* Minimal ping pong client/server demo. The client sends a text message to a server and the server
* responds with an extended message. Client and server are in different ASes connected by a mock
* border router.
*
* <p>To better see what is happening you can set the logging level to INFO in
* src/test/resources/simplelogger.properties
*/
public class PingPongSocketClient {
public static boolean PRINT = true;
public static void main(String[] args) throws IOException {
// The following starts a mock daemon for a local AS "1-ff00:0:110" and a border router that
// connects to "1-ff00:0:112"
DemoTopology.configureMock(true);
// This is used by the DatagramSocket internally to look up the ISD/AS code.
MockDNS.install("1-ff00:0:112", PingPongSocketServer.SERVER_ADDRESS.getAddress());
run();
DemoTopology.shutDown();
}
private static void run() throws IOException {
InetSocketAddress serverAddress = PingPongSocketServer.SERVER_ADDRESS;
try (ScionDatagramSocket socket = new ScionDatagramSocket(null)) {
String msg = "Hello there!";
byte[] sendBuf = msg.getBytes();
DatagramPacket request = new DatagramPacket(sendBuf, sendBuf.length, serverAddress);
socket.send(request);
println("Sent: " + msg);
println("Receiving ... (" + socket.getLocalSocketAddress() + ")");
byte[] buffer = new byte[512];
DatagramPacket response = new DatagramPacket(buffer, buffer.length);
socket.receive(response);
String pong = new String(buffer, 0, response.getLength());
println("Received: " + pong);
} catch (SocketTimeoutException e) {
throw new RuntimeException(e);
}
}
private static void println(String msg) {
if (PRINT) {
System.out.println(msg);
}
}
}