Question

我正在试图弄清楚这是否正常。因为没有错误，连接应该通过以下方式终止：

FIN ->
<- ACK
<- FIN
ACK ->

我在TCP连接结束时（通过SSL，但我也使用非加密方式得到它）：

         From     To
1494    server  client  TCP search-agent > 59185 [PSH, ACK] Seq=25974 Ack=49460 Win=63784 Len=50
1495    client  server  TCP 59185 > search-agent [ACK] Seq=49460 Ack=26024 Win=63565 Len=0
1496    client  server  TCP 59185 > search-agent [PSH, ACK] Seq=49460 Ack=26024 Win=63565 Len=23
1497    client  server  TCP 59185 > search-agent [FIN, ACK] Seq=49483 Ack=26024 Win=63565 Len=0
1498    server  client  TCP search-agent > 59185 [PSH, ACK] Seq=26024 Ack=49484 Win=63784 Len=23
1499    client  server  TCP 59185 > search-agent [RST, ACK] Seq=49484 Ack=26047 Win=0 Len=0

客户端正常退出并到达 socket.close ，不应该正常关闭连接而不重置？

我在谷歌上找不到任何关于java的TCP流...

这是我的代码：

服务器：

package Security;

import java.io.*;
import java.net.*;

import javax.net.ServerSocketFactory;
import javax.net.ssl.*;
import java.util.*;

public class SSLDemoServer
{
    private static ServerSocket serverSocket;
    private static final int PORT = 1234;

    public static void main(String[] args) throws IOException
    {
        int received = 0;
        String returned; 
        ObjectInputStream input = null;
        PrintWriter output = null;
        Socket client;

        System.setProperty("javax.net.ssl.keyStore", "key.keystore");
        System.setProperty("javax.net.ssl.keyStorePassword", "vwpolo");
        System.setProperty("javax.net.ssl.trustStore", "key.keystore");
        System.setProperty("javax.net.ssl.trustStorePassword", "vwpolo");

        try
        {
            System.out.println("Trying to set up server ...");
            ServerSocketFactory factory = SSLServerSocketFactory.getDefault();
            serverSocket = factory.createServerSocket(PORT);

            System.out.println("Server started!\n");
        }
        catch (IOException ioEx)
        {
            System.out.println("Unable to set up port!");
            ioEx.printStackTrace();
            System.exit(1);
        }

        while(true)
        {
            client = serverSocket.accept();
            System.out.println("Client trying to connect...");

            try
            {
                System.out.println("Trying to create inputstream...");
                input = new ObjectInputStream(client.getInputStream());
                System.out.println("Trying to create outputstream...");
                output = new PrintWriter(client.getOutputStream(), true);
                System.out.println("Client successfully connected!");

                while( true )
                {
                    received = input.readInt();
                    returned = Integer.toHexString(received);
                    System.out.print(" " + received);
                    output.println(returned.toUpperCase());
                }
            }
            catch(SSLException sslEx)
            {
                System.out.println("Connection failed! (non-SSL connection?)\n");
                client.close();
                continue;
            }
            catch(EOFException eofEx)
            {
                System.out.println("\nEnd of client data.\n");
            }
            catch(IOException ioEx)
            {
                System.out.println("I/O problem! (correct inputstream?)");
            }

            try {
                input.close();
                output.close();
            }
            catch (Exception e) {
            }
            client.close();
            System.out.println("Client closed.\n");
        }
    }
}

客户端：

package Security;

import java.io.*;
import java.net.*;
import javax.net.ssl.*;

import java.util.*;

public class SSLDemoClient
{
    private static InetAddress host;
    private static final int PORT = 1234;

    public static void main(String[] args)
    {
        System.setProperty("javax.net.ssl.keyStore", "key.keystore");
        System.setProperty("javax.net.ssl.keyStorePassword", "vwpolo");
        System.setProperty("javax.net.ssl.trustStore", "key.keystore");
        System.setProperty("javax.net.ssl.trustStorePassword", "vwpolo");

        System.out.println("\nCreating SSL socket ...");
        SSLSocket socket = null;
        try
        {
            host = InetAddress.getByName("192.168.56.101");
            SSLSocketFactory factory = (SSLSocketFactory)
            SSLSocketFactory.getDefault();
            socket = (SSLSocket) factory.createSocket(host, PORT);
            socket.startHandshake();
        }
        catch(UnknownHostException uhEx)
        {
            System.out.println("\nHost ID not found!\n");
            System.exit(1);
        }
        catch(SSLException sslEx)
        {
            System.out.println("\nHandshaking unsuccessful ...");
            System.exit(1);
        } 
        catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println("\nHandshaking succeeded ...\n");

        SSLClientThread client = new SSLClientThread(socket);
        SSLReceiverThread receiver = new SSLReceiverThread(socket);

        client.start();
        receiver.start();

        try
        {
            client.join();
            receiver.join();
            System.out.println("Trying to close...");
            socket.close();
        }
        catch(InterruptedException iEx)
        {
            iEx.printStackTrace();
        } 
        catch(IOException ioEx)
        {
            ioEx.printStackTrace();
        }

        System.out.println("\nClient finished.");
    }
}


class SSLClientThread extends Thread
{
    private SSLSocket socket;

    public SSLClientThread(SSLSocket s)
    {
        socket = s;
    }

    public void run() 
    {
        try
        {
            ObjectOutputStream output = new ObjectOutputStream(socket.getOutputStream());

            for( int i = 1; i < 1025; i++)
            {
                output.writeInt(i);
                sleep(10);
                output.flush();
            } 

            output.flush();
            sleep(1000);
            output.close();
        }
        catch(IOException ioEx)
        {
            System.out.println("Socket closed or unable to open socket.");
        }
        catch(InterruptedException iEx)
        {
            iEx.printStackTrace();
        }
    }
}


class SSLReceiverThread extends Thread
{
    private SSLSocket socket;

    public SSLReceiverThread(SSLSocket s)
    {
        socket = s;
    }

    public void run()
    {
        String response = null;
        BufferedReader input = null;

        try
        {
            input = new BufferedReader(
                    new InputStreamReader(socket.getInputStream()));

            try
            {
                response = input.readLine();
                while(!response.equals(null)) 
                {
                    System.out.print(response + " ");
                    response = input.readLine();
                } 
            }
            catch(Exception e)
            {
                System.out.println("\nEnd of server data.\n");
            }    

            input.close();

        }
        catch(IOException ioEx)
        {
            ioEx.printStackTrace();
        }
    }
}

非常感谢，在非SSL连接上，我现在可以在没有重置的情况下获得良好的有序连接关闭。

但显然SSLSocket不支持此方法？当我在我的SSL客户端中尝试它时，我得到以下异常：

Exception in thread "Thread-0" java.lang.UnsupportedOperationException: The method shutdownOutput() is not supported in SSLSocket
    at com.sun.net.ssl.internal.ssl.BaseSSLSocketImpl.shutdownOutput(Unknown Source)
    at Security.SSLClientThread.run(SSLDemoClient.java:99)

我的新代码如下：

package Security;

import java.io.*;
import java.net.*;

import javax.net.SocketFactory;
import javax.net.ssl.*;

public class SSLDemoClient
{
    private static InetAddress host;
    private static Socket socket;
    private static final int PORT = 1234;

    public static void main(String[] args)
    {
        System.setProperty("javax.net.ssl.keyStore", "key.keystore");
        System.setProperty("javax.net.ssl.keyStorePassword", "vwpolo");
        System.setProperty("javax.net.ssl.trustStore", "key.keystore");
        System.setProperty("javax.net.ssl.trustStorePassword", "vwpolo");

        System.out.println("\nCreating SSL socket ...");

        try
        {
            host = InetAddress.getByName("192.168.56.101");
            SocketFactory socketFactory = SSLSocketFactory.getDefault();
            socket = socketFactory.createSocket(host, PORT);
        }
        catch(UnknownHostException uhEx)
        {
            System.out.println("\nHost ID not found!\n");
            System.exit(1);
        }
        catch(SSLException sslEx)
        {
            System.out.println("\nHandshaking unsuccessful ...");
            System.exit(1);
        } 
        catch (IOException e) {
            e.printStackTrace();
        }
        System.out.println("\nHandshaking succeeded ...\n");

        SSLClientThread client = new SSLClientThread(socket);
        SSLReceiverThread receiver = new SSLReceiverThread(socket);

        client.start();
        receiver.start();

        try
        {
            client.join();
            receiver.join();
            System.out.println("Trying to close...");

            socket.close();
        }
        catch(InterruptedException iEx)
        {
            iEx.printStackTrace();
        } 
        catch(IOException ioEx)
        {
            ioEx.printStackTrace();
        }

        System.out.println("\nClient finished.");
    }
}


class SSLClientThread extends Thread
{
    private Socket socket;

    public SSLClientThread(Socket s)
    {
        socket = s;
    }

    public void run() 
    {
        try
        {
            ObjectOutputStream output = new ObjectOutputStream(socket.getOutputStream());

            for( int i = 1; i < 1025; i++)
            {
                output.writeInt(i);
                sleep(10);
                output.flush();
            } 

            output.flush();
            sleep(1000);
            socket.shutdownOutput();
        }
        catch(IOException ioEx)
        {
            System.out.println("Socket closed or unable to open socket.");
        }
        catch(InterruptedException iEx)
        {
            iEx.printStackTrace();
        }
    }
}


class SSLReceiverThread extends Thread
{
    private Socket socket;

    public SSLReceiverThread(Socket s)
    {
        socket = s;
    }

    public void run()
    {
        String response = null;
        BufferedReader input = null;

        try
        {
            input = new BufferedReader(
                    new InputStreamReader(socket.getInputStream()));

            try
            {
                response = input.readLine();
                while(!response.equals(null)) 
                {
                    System.out.print(response + " ");
                    response = input.readLine();
                } 
            }
            catch(Exception e)
            {
                System.out.println("\nEnd of server data.\n");
            }    

            socket.shutdownInput();

        }
        catch(IOException ioEx)
        {
            ioEx.printStackTrace();
        }
    }
}

我没有正确使用它吗？或者我的SSLSocket不正确？因为使用非SSL连接没有问题。

Answer 1

您的数据包日志显示客户端正在发送其最后一位数据，并通知服务器关闭连接。

服务器然后发回它的最后一位数据（可能是最后转换的整数）。客户端以RST响应，表示客户端套接字已关闭以读取和 - 客户端说“对不起，我没有抓到最后一点数据，我不再听了。“

我不是Java大师，但似乎调用套接字.close()的{{1}}方法会导致在套接字本身上调用OutputStream方法。你真正希望在这里发生的事情（在客户端写完最后一个整数之后）是在套接字上调用.close()方法。

Answer 2

正如caf指出的那样，问题在于，当您应该致电close时，您正在呼叫shutdownOutput。这是因为您尝试实现的是半关闭，其中连接的每一侧都关闭它的输出流，以便向对等方指示没有更多数据待处理（EOF）。

有关关闭和关闭之间差异的说明，请参阅此简短的答案“close vs. shutdown”以及此较长的文章“Socket shutdown versus socket close”。另请参阅Orderly Versus Abortive Connection Release in Java。

Answer 3

这里的真正的问题是，在另一端已经关闭其连接结束之后，一端正在写入。这是应用程序协议错误。

Java，服务器客户端TCP通信以RST结束

3 个答案: