![]() We have to realize the underlying TCP server front. We have designed the basic functions of Telnet servers. In fact, we realize Telnet server mainly deal with: how to receive and respond to these commands. We simply set the six kinds of commands: "hello", "date", "time", "version", "quit" and "help" commands. On the other hand, in order to achieve command interaction, we need to set the command to the Telnet server. If you are not logged press login password to resolve. If you are logged press command interaction to resolve. The first is set on the connection status, where we will simply state is defined as two types: logged in and logged. The specific operation flow is designed as follows:įrom a flow chart of the above fact, we see the Telnet server design has been very clear. When the client successfully linked to a server, the server will prompt the user to log on, after the successful landing can send commands to the server, when sending a different command, the server gives a different response. We want to achieve this Telnet server is a relatively simple design. The server can provide access to multiple clients. Telnet is a remote login based on TCP, Telnet protocol is also assigned a fixed port 23, here we are with the port to achieve a Telnet server. not forced Telnet client input from the keyboard, the client is not forced on the screen display output. Symmetric processing ends Telnet connection, i.e.Including a Telnet client and server mechanism allows the negotiation options, but it also provides a set of standard options.The client does not have to learn more about the remote system, they simply constructed using a standard interface program Telnet is defined a virtual terminal provides a standard network interface to the remote system.Telnet protocol can use the local computer used by the user terminal into a remote host system. The agreement must be authenticated by user name and password, a standard protocol for remote login Internet services. Telnet is a protocol on the application layer - the OSI 7 layer model, is provided to connect to a remote host terminal emulation TCP / IP protocol by creating virtual terminal. Telnet is a common way to remotely control Web servers. To start a telnet session, you must enter a user name and password to login server. ![]() You may be able to control the server locally. The end user can enter commands in the telnet program, these commands will run on the server, just as input directly on the server console. Using the telnet program on the user's computer terminal, with which is connected to the server. ![]() It provides the ability to complete the work of the remote host on a local computer user. Telnet protocol is TCP / IP protocol suite one, is the main way Internet standard protocols and remote login service. Next, we implement a TCP, Telnet server-based applications. We have already achieved a TCP server and client-based RAW API, to achieve HTTP applications are based on this.
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