DoS protection. Java

dev017

Jul 30th, 2023 (edited)

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import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;
public class Server {
public static void main(String[] args) {
try {
ServerSocket serverSocket = new ServerSocket(8080);
System.out.println("servidor iniciado na porta 8080.");
while (true) {
Socket clientSocket = serverSocket.accept();
System.out.println("nova conexão recebida.");
if (Thread.activeCount() > 100) {
System.out.println("número máximo de conexões atingido. Rejeitando nova conexão.");
clientSocket.close();
continue;
}
Thread thread = new Thread(new ConnectionHandler(clientSocket));
thread.start();
}
} catch (IOException e) {
System.out.println("erro ao iniciar o servidor: " + e.getMessage());
}
}
}
class ConnectionHandler implements Runnable {
private Socket clientSocket;
public ConnectionHandler(Socket clientSocket) {
this.clientSocket = clientSocket;
}
@Override
public void run() {
try {
public class Servidor {
public static void main(String[] args) {
int porta = 12345;
try {
ServerSocket servidor = new ServerSocket(porta);
System.out.println("Servidor ouvindo na porta " + porta);
while (true) {
Socket cliente = servidor.accept();
System.out.println("Cliente conectado: " + cliente.getInetAddress().getHostAddress());
BufferedReader entrada = new BufferedReader(new InputStreamReader(cliente.getInputStream()));
PrintWriter saida = new PrintWriter(cliente.getOutputStream(), true);
String mensagemCliente = entrada.readLine();
System.out.println("mensagem recebida do cliente: " + mensagemCliente);
String resposta = "olá!";
saida.println(resposta);
System.out.println("resposta enviada para o cliente: " + resposta);
cliente.close();
System.out.println("cliente desconectado");
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
} catch (IOException e) {
System.out.println("erro ao lidar com a conexão: " + e.getMessage());
} finally {
try {
clientSocket.close();
} catch (IOException e) {
System.out.println(rErro ao fechar o socket: " + e.getMessage());
}
}
}
}

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