init

src/main/java/cn/x47/RIPService.java

@@ -10,7 +10,9 @@ import cn.x47.service.RIPServer;
 import java.net.InetAddress;
 import java.util.ArrayList;
 import java.util.List;
-import java.util.concurrent.*;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
 
 public class RIPService {
 
@@ -31,11 +33,13 @@ public class RIPService {
         // 定期发送路由更新
         ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);
         scheduler.scheduleAtFixedRate(() -> {
+            System.out.println("发送 开始");
             RIPPacket packet = createRipResponsePacket(Config.RIP_VERSION);
             client.sendRipPacket(packet);
-        }, 0, 30, TimeUnit.SECONDS);
+            System.out.println("发送 结束");
+        }, 0, 10, TimeUnit.SECONDS);
 
-//         主线程等待
+        // 主线程等待
         Thread.currentThread().join();
     }
 
@@ -44,9 +48,9 @@ public class RIPService {
 
         try {
             // 示例：添加本地路由条目
-            InetAddress localAddress = InetAddress.getByName("192.168.100.0");
+            InetAddress localAddress = InetAddress.getByName("10.47.54.0");
             InetAddress subnetMask = InetAddress.getByName("255.255.255.0");
-            InetAddress nextHop = InetAddress.getByName("192.168.123.45");
+            InetAddress nextHop = InetAddress.getByName("192.168.192.10");
 
             RIPEntry entry = new RIPEntry();
             entry.setAddressFamily((short) 2); // AF_INET

src/main/java/cn/x47/handle/RIPPacketDecoder.java

@@ -1,5 +1,6 @@
 package cn.x47.handle;
 
+
 import cn.x47.model.RIPEntry;
 import cn.x47.model.RIPPacket;
 import io.netty.buffer.ByteBuf;

src/main/java/cn/x47/handle/RIPPacketEncoder.java

@@ -5,8 +5,8 @@ import cn.x47.model.RIPEntry;
 import cn.x47.model.RIPPacket;
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.socket.DatagramPacket;
 import io.netty.handler.codec.MessageToMessageEncoder;
+import io.netty.channel.socket.DatagramPacket;
 
 import java.net.InetSocketAddress;
 import java.util.List;

src/main/java/cn/x47/handle/RIPServerHandler.java

@@ -3,6 +3,7 @@ package cn.x47.handle;
 
 import cn.x47.model.RIPEntry;
 import cn.x47.model.RIPPacket;
+import cn.x47.service.RoutingTable;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.channel.SimpleChannelInboundHandler;
 
@@ -10,17 +11,12 @@ public class RIPServerHandler extends SimpleChannelInboundHandler<RIPPacket> {
 
     @Override
     protected void channelRead0(ChannelHandlerContext ctx, RIPPacket msg) throws Exception {
-        System.out.println(msg);
         if (msg.getCommand() == 2) { // Response
             for (RIPEntry entry : msg.getEntries()) {
                 // 更新本地路由表
                 updateRoutingTable(entry);
             }
-        } else if (msg.getCommand() == 1) {
+        } else if (msg.getCommand() == 1) { // Request
-            for (RIPEntry entry : msg.getEntries()) {
-                // 更新本地路由表
-                updateRoutingTable(entry);
-            }
             // 处理请求，可能需要发送响应包
             // ...
         }
@@ -29,8 +25,10 @@ public class RIPServerHandler extends SimpleChannelInboundHandler<RIPPacket> {
     private void updateRoutingTable(RIPEntry entry) {
         // 实现路由表更新逻辑
         // 这里只是示例，实际需要处理路由添加、更新、超时等逻辑
-        System.out.println("Received route: " + entry.getIpAddress().getHostAddress() +
+        RoutingTable.getInstance().updateRoute(entry);
+        System.out.println("Updated route: " + entry.getIpAddress().getHostAddress() +
                 " via " + entry.getNextHop().getHostAddress() +
                 " metric: " + entry.getMetric());
+
     }
 }

src/main/java/cn/x47/model/RIPPacket.java

@@ -4,7 +4,6 @@ import lombok.AllArgsConstructor;
 import lombok.Data;
 import lombok.NoArgsConstructor;
 
-import java.net.InetSocketAddress;
 import java.util.List;
 
 @Data
@@ -13,9 +12,8 @@ import java.util.List;
 public class RIPPacket {
     private byte command; // 1=Request, 2=Response
     private byte version; // 1=RIP v1, 2=RIP v2
-    private short unused = 0; // 未使用，设置为 0
+    private short unused; // 未使用，设置为 0
     private List<RIPEntry> entries;
-    private InetSocketAddress senderAddress;
 
     // 添加构造方法和 Getter/Setter
     public RIPPacket(byte command, byte version, List<RIPEntry> entries) {

src/main/java/cn/x47/service/RIPClient.java

@@ -11,6 +11,7 @@ import io.netty.channel.nio.NioEventLoopGroup;
 import io.netty.channel.socket.DatagramChannel;
 import io.netty.channel.socket.nio.NioDatagramChannel;
 
+
 public class RIPClient {
 
     private final Bootstrap bootstrap;
@@ -32,21 +33,14 @@ public class RIPClient {
 
     public void sendRipPacket(RIPPacket packet) {
         try {
-            ChannelFuture future = bootstrap.bind(600).sync();  // 部分环境下需不同端口尝试
+            ChannelFuture future = bootstrap.bind(0).sync();
-            future.channel().writeAndFlush(packet).addListener(f -> {
+            future.channel().writeAndFlush(packet).sync();
-                if (f.isSuccess()) {
+            future.channel().close();
-                    System.out.println("Packet sent successfully");
-                } else {
-                    System.err.println("Failed to send packet: " + f.cause().getMessage());
-                }
-            });
-            future.channel().closeFuture().sync();  // 等待，保持通道开启
         } catch (InterruptedException e) {
             e.printStackTrace();
         }
     }
 
-
     public void shutdown() {
         group.shutdownGracefully();
     }

src/main/java/cn/x47/service/RoutingTable.java

@@ -0,0 +1,35 @@
+package cn.x47.service;
+
+
+
+import cn.x47.model.RIPEntry;
+
+import java.net.InetAddress;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+public class RoutingTable {
+    private static RoutingTable instance = new RoutingTable();
+    private Map<InetAddress, RIPEntry> routes;
+
+    private RoutingTable() {
+        routes = new ConcurrentHashMap<>();
+    }
+
+    public static RoutingTable getInstance() {
+        return instance;
+    }
+
+    public void updateRoute(RIPEntry entry) {
+        // 简单地将新路由添加或更新到路由表中
+        routes.put(entry.getIpAddress(), entry);
+    }
+
+    public void removeRoute(InetAddress ipAddress) {
+        routes.remove(ipAddress);
+    }
+
+    public Map<InetAddress, RIPEntry> getRoutes() {
+        return routes;
+    }
+}

src/test/java/Connection.java

@@ -0,0 +1,285 @@
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.net.InetAddress;
+import java.net.ServerSocket;
+import java.net.Socket;
+import java.net.UnknownHostException;
+import java.util.*;
+
+/**
+ * Connection class takes input from the user
+ * and creates threads for the client and server
+ *
+ * @author Ankit
+ */
+public class Connection {
+
+    // Stores destination and cost to reach
+    public static HashMap<String, Integer> table;
+    // Stores local ip address
+    static String[] localIP;
+    // Stores it's neighbors
+    static ArrayList<String> neighbors;
+    //Stores destination and next hop
+    public static HashMap<String, String> hop;
+    // Subnet mask
+    public static String subnetMask = "255.255.255.0";
+
+    public static void main(String[] args) throws IOException {
+        table = new HashMap<>();
+        hop = new HashMap<>();
+        neighbors = new ArrayList<>();
+        System.out.println(InetAddress.getLocalHost() + " connection started");
+        localIP = InetAddress.getLocalHost().toString().split("/");
+        System.out.println("Updated position 1");
+        table.put(localIP[1], 0);
+        hop.put(localIP[1], localIP[1]);
+        // Starts the server
+        Server server = new Server();
+        server.start();
+
+        int length = args.length;
+        // User input for the neighbor ip and cost
+        Scanner scan = new Scanner(System.in);
+        for (int i = 0; i < length; i++) {
+            System.out.println("Enter the cost for " + args[i].toString());
+            int cost = scan.nextInt();
+            new Client(args[i], cost).start();
+        }
+        scan.close();
+    }
+
+    /**
+     * Updates the destination cost and the next hop
+     *
+     * @param temp     - routing table of neighbor
+     * @param senderIP - sender ip address
+     * @param tempHop  - Next hops of the sender
+     */
+    public static void updateTable(Map<String, Integer> temp, String senderIP, Map<String, String> tempHop) {
+        // updates the table if neighbor has smaller value
+        if (table.containsKey(senderIP) && temp.containsKey(localIP[1])) {
+            if (table.get(senderIP) > temp.get(localIP[1])) {
+                table.put(senderIP, temp.get(localIP[1]));
+                if (tempHop.get(localIP[1]).equals(localIP[1])) {
+                    hop.put(senderIP, senderIP);
+                } else {
+                    for (int i = 0; i < neighbors.size(); i++) {
+                        if (!neighbors.get(i).equals(senderIP)) {
+                            hop.put(senderIP, neighbors.get(i));
+                        }
+                    }
+                }
+
+            }
+        }
+
+        // Add the neighbor if neighbor has its entry
+        if (!table.containsKey(senderIP)) {
+            table.put(senderIP, temp.get(localIP[1]));
+            hop.put(senderIP, senderIP);
+        }
+
+        @SuppressWarnings("rawtypes")
+        Iterator it = temp.entrySet().iterator();
+        while (it.hasNext()) {
+            @SuppressWarnings("rawtypes")
+            Map.Entry pair = (Map.Entry) it.next();
+            String ip = pair.getKey().toString();
+            if (!table.containsKey(ip)) {
+                table.put(ip, Integer.parseInt(pair.getValue().toString())
+                        + table.get(senderIP));
+                hop.put(ip, senderIP);
+            } else {
+                if (table.get(ip) > (Integer.parseInt(pair.getValue()
+                        .toString()) + table.get(senderIP))) {
+                    table.put(
+                            ip,
+                            (Integer.parseInt(pair.getValue().toString()) + table
+                                    .get(senderIP)));
+                    hop.put(ip, senderIP);
+                }
+            }
+        }
+    }
+
+    /**
+     * Displays the desired output i.e.
+     * Destination, subnet mask, cost and next hop
+     */
+    public static void display() {
+        @SuppressWarnings("rawtypes")
+        Iterator it = table.entrySet().iterator();
+        System.out.println("------ UPDATED TABLE -----");
+        System.out.println("Destination" + '\t' + "Subnet Mask" + '\t' + "Cost" + '\t' + "Next Hop");
+        while (it.hasNext()) {
+            @SuppressWarnings("rawtypes")
+            Map.Entry pair = (Map.Entry) it.next();
+            String[] ipSubParts = pair.getKey().toString().split("\\.");
+            String[] subnetSubParts = subnetMask.split("\\.");
+            String[] netID = new String[4];
+            for (int i = 0; i < ipSubParts.length; i++) {
+                netID[i] = Integer.toString((Integer.parseInt(ipSubParts[i]) & Integer.parseInt(subnetSubParts[i])));
+            }
+            String networkID = netID[0] + "." + netID[1] + "." + netID[2] + "." + netID[3];
+            // Desired output displayed
+            System.out.println(networkID + '\t' + subnetMask + '\t' + pair.getValue() + '\t' + hop.get(pair.getKey().toString()));
+        }
+        System.out.println();
+        System.out.println("----------------------------------------------");
+    }
+
+}
+
+/**
+ * Server class accepts the connection from the neighbors
+ * It waits for neighbors input, updates table
+ * and sends updated table
+ *
+ * @author Ankit
+ */
+class Server extends Thread {
+
+    private static ServerSocket server;
+    private Socket connection;
+    ObjectInputStream input;
+    ObjectOutputStream output;
+
+    public Server() throws IOException {
+        server = new ServerSocket(6969);
+    }
+
+    public void run() {
+        try {
+            accept();
+        } catch (UnknownHostException | ClassNotFoundException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public void accept() throws UnknownHostException, ClassNotFoundException {
+        try {
+            int count = 0;
+            while (count < 2) {
+                count++;
+                System.out.println(InetAddress.getLocalHost()
+                        + " is waiting for connection " + count);
+                // accepts the connection from the neighbors
+                connection = server.accept();
+                System.out.println(InetAddress.getLocalHost()
+                        + " connected to " + connection.getInetAddress());
+                String[] connectionIP = connection.getInetAddress().toString()
+                        .split("/");
+                Connection.neighbors.add(connectionIP[1]);
+                output = new ObjectOutputStream(connection.getOutputStream());
+                input = new ObjectInputStream(connection.getInputStream());
+
+                // Creates new thread to interact with the client
+                new Thread(new Runnable() {
+                    @SuppressWarnings({"rawtypes", "unchecked"})
+                    @Override
+                    public void run() {
+                        while (true) {
+                            try {
+                                HashMap<HashMap<String, Integer>, HashMap<String, String>> receiver;
+                                // reads the input from the neighbor
+                                receiver = (HashMap<HashMap<String, Integer>, HashMap<String, String>>) input.readObject();
+                                HashMap<String, Integer> temp = (HashMap<String, Integer>) receiver.keySet().toArray()[0];
+                                HashMap<String, String> tempHop = receiver.get(temp);
+                                @SuppressWarnings("unused")
+                                Iterator it = temp.entrySet().iterator();
+                                Connection.updateTable(temp, connectionIP[1], tempHop);
+                                HashMap<HashMap<String, Integer>, HashMap<String, String>> sender;
+                                sender = new HashMap<HashMap<String, Integer>, HashMap<String, String>>();
+                                sender.put(Connection.table, Connection.hop);
+                                // sends the updated table to its neighbors
+                                output.writeObject(sender);
+                                output.reset();
+                                Connection.display();
+                                Thread.sleep(1000);
+                            } catch (Exception e) {
+                                System.exit(0);
+                            }
+                        }
+                    }
+                }).start();
+
+            }
+        } catch (IOException e) {
+            System.exit(0);
+        }
+    }
+}
+
+/**
+ * Client asks for the connection to the server
+ * It sends current routing table and recieves the updated routing table
+ *
+ * @author Ankit
+ */
+class Client extends Thread {
+
+    Socket connection;
+    String ipAddress = "";
+    int cost;
+    ObjectInputStream input;
+    ObjectOutputStream output;
+
+    public Client(String ip, int cost) throws IOException {
+        ipAddress = ip;
+        this.cost = cost;
+    }
+
+    @SuppressWarnings({"unused", "unchecked"})
+    public void run() {
+        try {
+            // connects to the server
+            connection = new Socket(ipAddress, 6969);
+            Connection.neighbors.add(ipAddress);
+            output = new ObjectOutputStream(connection.getOutputStream());
+            input = new ObjectInputStream(connection.getInputStream());
+            System.out.println(InetAddress.getLocalHost().toString()
+                    + " Connected to: " + ipAddress + " with cost: " + cost);
+            if (Connection.table.containsKey(ipAddress)) {
+                if (Connection.table.get(ipAddress) > cost) {
+                    Connection.table.put(ipAddress, cost);
+                    Connection.hop.put(ipAddress, ipAddress);
+                }
+            } else {
+                Connection.table.put(ipAddress, cost);
+                Connection.hop.put(ipAddress, ipAddress);
+            }
+
+            while (true) {
+                Connection.display();
+                HashMap<HashMap<String, Integer>, HashMap<String, String>> sender;
+                sender = new HashMap<HashMap<String, Integer>, HashMap<String, String>>();
+                sender.put(Connection.table, Connection.hop);
+                // sends updated cost and next hop table to the neighbor
+                output.writeObject(sender);
+                output.reset();
+
+                HashMap<HashMap<String, Integer>, HashMap<String, String>> receiver;
+                // reads updated cost and next hop table from neighbor
+                receiver = (HashMap<HashMap<String, Integer>, HashMap<String, String>>) input.readObject();
+                HashMap<String, Integer> temp = (HashMap<String, Integer>) receiver.keySet().toArray()[0];
+                HashMap<String, String> tempHop = receiver.get(temp);
+                @SuppressWarnings("rawtypes")
+                Iterator it = temp.entrySet().iterator();
+                Connection.updateTable(temp, ipAddress, tempHop);
+                Thread.sleep(1000);
+            }
+
+        } catch (UnknownHostException e) {
+            System.out.println("Cannot connect to the network: "
+                    + e.getMessage());
+        } catch (IOException e) {
+            System.exit(0);
+        } catch (InterruptedException e) {
+            e.printStackTrace();
+        } catch (ClassNotFoundException e) {
+            e.printStackTrace();
+        }
+    }
+}