Hello, I am building a telnet server with node js.
Has anyone ever used the *readline* module with socket as input and output?
i.e. *readline.createInterface(socket, socket);*
It seems everything goes wrong when I use socket as I/O
Here is my code:
===============================================
/*
* Callback method executed when a new TCP socket is opened.
*/
function newSocket(socket) {
//console.info(socket);
var option = {
input: socket,
output: socket,
terminal:true
};
var rl =readline.createInterface(option);
rl.write("Welcome to the Telnet server!\n");//Works fine
rl.setPrompt(">");
rl.prompt();
*rl.on('line', function (line){//On reading a line!*
* line = line.trim();*
* console.info("Read a line!")*
* if(line === "@quit") {*
* socket.write('Goodbye!\n');*
* closeSocket(socket);//The function is defined elsewhere*
* }else if (line === "enable") {*
* socket.write("Enter enable mode!\n")*
* rl.setPrompt("#");*
* }else{*
* socket.write('echo:'+line+'\n');*
* }*
* rl.prompt();*
* });*
};
// Create a new server and provide a callback for when a connection occurs
var server = net.createServer(newSocket);
server.listen(8888);
console.info('Server has started!');
============================================
After I telnet into the server and input 'abc', the results shown in the
*client* are:
*Welcome to the Telnet server!*
*>abc //Input abc*
*abc*
*>echo:abc*
*>echo:echo:abc*
============================================
And the *server* side:
*Server has started!*
*Read a line!*
*Read a line!*
============================================
It seems it reads twice after I send my input, how could this happen?
Any alternative for building a telnet server with completion function of
NodeJS is also welcome.
*Thank you so much!*
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