C#如何实现同步模式下的端口映射程序

这篇文章主要介绍了C#如何实现同步模式下的端口映射程序的相关知识，内容详细易懂，操作简单快捷，具有一定借鉴价值，相信大家阅读完这篇C#如何实现同步模式下的端口映射程序文章都会有所收获，下面我们一起来看看吧。

代码如下：

class Program{    static void Main(string[] args)    {        TcpListener listener = new TcpListener(new IPEndPoint(IPAddress.Loopback, 8000));        listener.Start();        while (true)        {            var client = listener.AcceptTcpClient();            Console.WriteLine("connected");            var proxy = new TcpClient();            Console.WriteLine("remote connected");            proxy.Connect(new IPEndPoint(IPAddress.Loopback, 21));            new SyncProxy("client->remote",proxy.GetStream(), client.GetStream());            new SyncProxy("remote->client",client.GetStream(), proxy.GetStream());        }    }}class SyncProxy{    NetworkStream read;    NetworkStream write;    string name;    public SyncProxy(string name, NetworkStream read,NetworkStream write)    {        this.name = name;        this.read = read;        this.write = write;        System.Threading.ThreadPool.QueueUserWorkItem(PipeStream);    }    void PipeStream(object state)    {        byte[] buffer = new byte[1500];        int count = 0;        while (true)        {            try            {                count = read.Read(buffer, 0, buffer.Length);            }            catch (Exception)            {                count = 0;            }            if (count == 0)            {                Console.WriteLine(name+" closed");                write.Close();                break;            }            Console.Write(name + ": "+ Encoding.Default.GetString(buffer, 0, count));            write.Write(buffer, 0, count);        }    }}

通过它获取到的cuteFtp交互命令如下：

connected
remote connected
client->remote: 220 Serv-U FTP Server v6.0 for WinSock ready...
remote->client: USER 1
client->remote: 331 User name okay, need password.
remote->client: PASS 1
client->remote: 230 User logged in, proceed.
remote->client: PWD
client->remote: 257 "/" is current directory.
remote->client: FEAT
client->remote: 211-Extension supported
client->remote: CLNT
MDTM
MDTM YYYYMMDDHHMMSS[+-TZ];filename
SIZE
SITE PSWD;EXEC;SET;INDEX;ZONE;CHMOD;MSG
REST STREAM
XCRC filename;start;end
MODE Z
211 End
remote->client: REST 0
client->remote: 350 Restarting at 0. Send STORE or RETRIEVE.
remote->client: PASV
client->remote: 227 Entering Passive Mode (127,0,0,1,29,18)
remote->client: LIST
client->remote: 150 Opening ASCII mode data connection for /bin/ls.
client->remote: 226 Transfer complete.

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