Discovery port 8888 integriert; doppelte Datei aus tests entfernt
smittythekid
parent
4c5842aa8f
commit
4534883782
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@ -6,7 +6,6 @@ import java.net.InetAddress;
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import java.nio.charset.StandardCharsets;
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import java.io.IOException;
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public class SyslogServer {
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public static void main(String[] args) {
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int port = 5514; // Default syslog port: 514, but using 5514 to avoid permission issues
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@ -14,53 +13,88 @@ public class SyslogServer {
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server.start(port);
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}
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private void runDiscoveryListener() {
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try {
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DatagramSocket discoverySocket = new DatagramSocket(8888); // Port for discovery
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byte[] bufferDiscovery = new byte[256];
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System.out.println("Discovery Listener started on port 8888");
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while (true) {
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DatagramPacket discoveryRequest = new DatagramPacket(bufferDiscovery, bufferDiscovery.length);
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discoverySocket.receive(discoveryRequest);
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InetAddress clientAddress = discoveryRequest.getAddress();
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int clientPort = discoveryRequest.getPort();
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System.out.println(
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"Discovery request received from: " + clientAddress.getHostAddress() + ":" + clientPort);
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// Send a response back to the client
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byte[] responseData = "SYSLOG_SERVER".getBytes(StandardCharsets.UTF_8);
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DatagramPacket discoveryResponse = new DatagramPacket(
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responseData,
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responseData.length,
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clientAddress,
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clientPort);
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discoverySocket.send(discoveryResponse);
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}
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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private static final int MAX_MESSAGE_SIZE = 480;
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public void start(int port) {
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System.out.println("Syslog Server started on port " + port);
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// Discovery Listener in a separate thread
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new Thread(() -> runDiscoveryListener()).start();
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try{
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try {
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// Create a DatagramSocket to listen for incoming messages
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DatagramSocket socket = new DatagramSocket(port);
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// Buffer to hold incoming messages
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byte[] buffer = new byte[1024];
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while(true){
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while (true) {
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DatagramPacket packet = new DatagramPacket(buffer, buffer.length);
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// Wait for a message to be received (blocking call)
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socket.receive(packet);
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// Extract the message from the packet + data; how many bytes were actually received
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// Extract the message from the packet + data; how many bytes were actually
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// received
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int length = packet.getLength();
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if (length > MAX_MESSAGE_SIZE) {
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System.err.println("Received message exceeds maximum allowed size of " + MAX_MESSAGE_SIZE + " bytes. Message will be ignored.");
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System.err.println("Received message exceeds maximum allowed size of " + MAX_MESSAGE_SIZE
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+ " bytes. Message will be ignored.");
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continue; // Skip processing this message
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}
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String message = new String(
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packet.getData(), // complete byte array be aware: packet.getData() returns the entire buffer, not just the received data
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packet.getOffset(), // get the offset where the data starts
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length,
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StandardCharsets.UTF_8); // Convert the byte array to a string using UTF-8 encoding
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System.out.println("Nachricht received: " + message);
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String message = new String(
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packet.getData(), // complete byte array be aware: packet.getData() returns the entire buffer,
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// not just the received data
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packet.getOffset(), // get the offset where the data starts
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length,
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StandardCharsets.UTF_8); // Convert the byte array to a string using UTF-8 encoding
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// Show Client IP and Port
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InetAddress clientAddress = packet.getAddress();
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int clientPort = packet.getPort();
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System.out.println("From: " + clientAddress.getHostAddress() + ":" + clientPort);
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}
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System.out.println("Message received: " + message);
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}
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}
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catch(IOException e){
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catch (IOException e) {
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System.err.println("Could not start server: " + e.getMessage());
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return;
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}
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@ -1,87 +0,0 @@
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package vs;
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/**
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* helper class for RFC 5424 (https://datatracker.ietf.org/doc/html/rfc5424)
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* compliant log messages as immutable Java objects - representation of a subset
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* of printable strings of specific length
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*
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* @author Sandro Leuchter
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*
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*/
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public abstract class AsciiChars {
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private final String value;
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public String value() {
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return this.value;
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}
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protected AsciiChars(int length, String value) {
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if (value != null) {
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if (value.length() > length) {
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throw new IllegalArgumentException(
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"Stringlänge = " + value.length() + " > " + length
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);
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}
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for (int c : value.getBytes()) {
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if (c < 33 || c > 126) {
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throw new IllegalArgumentException(
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"Stringinhalt nicht printable US-ASCII ohne Space"
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);
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}
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}
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}
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this.value = value;
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}
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@Override
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public String toString() {
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if (value() == null || value().length() == 0) {
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return "-";
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} else {
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return value();
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}
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}
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public static final class L004 extends AsciiChars {
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public L004(String value) {
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super(4, value);
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}
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}
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public static final class L012 extends AsciiChars {
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public L012(String value) {
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super(12, value);
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}
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}
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public static final class L032 extends AsciiChars {
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public L032(String value) {
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super(32, value);
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}
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}
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public static final class L048 extends AsciiChars {
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public L048(String value) {
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super(48, value);
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}
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}
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public static final class L128 extends AsciiChars {
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public L128(String value) {
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super(128, value);
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}
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}
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public static final class L255 extends AsciiChars {
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public L255(String value) {
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super(255, value);
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}
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}
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}
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