C#如何实现同步模式下的端口映射程序

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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