enigma-bbs/core/servers/telnet.js

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2014-10-17 02:21:06 +00:00
/* jslint node: true */
'use strict';
// ENiGMA½
var baseClient = require('../client.js');
var Log = require('../logger.js').log;
var ServerModule = require('../server_module.js').ServerModule;
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var net = require('net');
var buffers = require('buffers');
var binary = require('binary');
var stream = require('stream');
var assert = require('assert');
var util = require('util');
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//var debug = require('debug')('telnet');
exports.moduleInfo = {
name : 'Telnet',
desc : 'Telnet Server',
author : 'NuSkooler'
};
exports.getModule = TelnetServerModule;
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//
// Telnet Protocol Resources
// * http://pcmicro.com/netfoss/telnet.html
// * http://mud-dev.wikidot.com/telnet:negotiation
//
/*
TODO:
* Document COMMANDS -- add any missing
* Document OPTIONS -- add any missing
* Internally handle OPTIONS:
* Some should be emitted generically
* Some shoudl be handled internally -- denied, handled, etc.
*
* Allow term (ttype) to be set by environ sub negotiation
* Process terms in loop.... research needed
* Handle will/won't
* Handle do's, ..
* Some won't should close connection
* Options/Commands we don't understand shouldn't crash the server!!
*/
var COMMANDS = {
SE : 240, // End of Sub-Negotation Parameters
NOP : 241, // No Operation
DM : 242, // Data Mark
BRK : 243, // Break
IP : 244, // Interrupt Process
AO : 245, // Abort Output
AYT : 246, // Are You There?
EC : 247, // Erase Character
EL : 248, // Erase Line
GA : 249, // Go Ahead
SB : 250, // Start Sub-Negotiation Parameters
WILL : 251, //
WONT : 252,
DO : 253,
DONT : 254,
IAC : 255, // (Data Byte)
};
//
// Resources:
// * http://www.faqs.org/rfcs/rfc1572.html
//
var SB_COMMANDS = {
IS : 0,
SEND : 1,
INFO : 2,
};
//
// Telnet Options
//
// Resources
// * http://mars.netanya.ac.il/~unesco/cdrom/booklet/HTML/NETWORKING/node300.html
//
var OPTIONS = {
TRANSMIT_BINARY : 0, // http://tools.ietf.org/html/rfc856
ECHO : 1, // http://tools.ietf.org/html/rfc857
// RECONNECTION : 2
SUPPRESS_GO_AHEAD : 3, // aka 'SGA': RFC 858 @ http://tools.ietf.org/html/rfc858
//APPROX_MESSAGE_SIZE : 4
STATUS : 5, // http://tools.ietf.org/html/rfc859
TIMING_MARK : 6, // http://tools.ietf.org/html/rfc860
//RC_TRANS_AND_ECHO : 7, // aka 'RCTE' @ http://www.rfc-base.org/txt/rfc-726.txt
//OUPUT_LINE_WIDTH : 8,
//OUTPUT_PAGE_SIZE : 9, //
//OUTPUT_CARRIAGE_RETURN_DISP : 10, // RFC 652
//OUTPUT_HORIZ_TABSTOPS : 11, // RFC 653
//OUTPUT_HORIZ_TAB_DISP : 12, // RFC 654
//OUTPUT_FORMFEED_DISP : 13, // RFC 655
//OUTPUT_VERT_TABSTOPS : 14, // RFC 656
//OUTPUT_VERT_TAB_DISP : 15, // RFC 657
//OUTPUT_LF_DISP : 16, // RFC 658
//EXTENDED_ASCII : 17, // RFC 659
//LOGOUT : 18, // RFC 727
//BYTE_MACRO : 19, // RFC 753
//DATA_ENTRY_TERMINAL : 20, // RFC 1043
//SUPDUP : 21, // RFC 736
//SUPDUP_OUTPUT : 22, // RFC 749
//SEND_LOCATION : 23, // RFC 779
TERMINAL_TYPE : 24, // aka 'TTYPE': RFC 1091 @ http://tools.ietf.org/html/rfc1091
//END_OF_RECORD : 25, // RFC 885
//TACACS_USER_ID : 26, // RFC 927
//OUTPUT_MARKING : 27, // RFC 933
//TERMINCAL_LOCATION_NUMBER : 28, // RFC 946
//TELNET_3270_REGIME : 29, // RFC 1041
WINDOW_SIZE : 31, // aka 'NAWS': RFC 1073 @ http://tools.ietf.org/html/rfc1073
TERMINAL_SPEED : 32, // RFC 1079 @ http://tools.ietf.org/html/rfc1079
REMOTE_FLOW_CONTROL : 33, // RFC 1072 @ http://tools.ietf.org/html/rfc1372
LINEMODE : 34, // RFC 1184 @ http://tools.ietf.org/html/rfc1184
X_DISPLAY_LOCATION : 35, // aka 'XDISPLOC': RFC 1096 @ http://tools.ietf.org/html/rfc1096
NEW_ENVIRONMENT_DEP : 36, // aka 'NEW-ENVIRON': RFC 1408 @ http://tools.ietf.org/html/rfc1408 (note: RFC 1572 is an update to this)
AUTHENTICATION : 37, // RFC 2941 @ http://tools.ietf.org/html/rfc2941
ENCRYPT : 38, // RFC 2946 @ http://tools.ietf.org/html/rfc2946
NEW_ENVIRONMENT : 39, // aka 'NEW-ENVIRON': RFC 1572 @ http://tools.ietf.org/html/rfc1572 (note: update to RFC 1408)
//TN3270E : 40, // RFC 2355
//XAUTH : 41,
//CHARSET : 42, // RFC 2066
//REMOTE_SERIAL_PORT : 43,
//COM_PORT_CONTROL : 44, // RFC 2217
//SUPRESS_LOCAL_ECHO : 45,
//START_TLS : 46,
//KERMIT : 47, // RFC 2840
//SEND_URL : 48,
//FORWARD_X : 49,
//PRAGMA_LOGON : 138,
//SSPI_LOGON : 139,
//PRAGMA_HEARTBEAT : 140
EXTENDED_OPTIONS_LIST : 255, // RFC 861 (STD 32)
}
// Commands used within NEW_ENVIRONMENT[_DEP]
var NEW_ENVIRONMENT_COMMANDS = {
VAR : 0,
VALUE : 1,
ESC : 2,
USERVAR : 3,
};
var IAC_BUF = new Buffer([ COMMANDS.IAC ]);
var SB_BUF = new Buffer([ COMMANDS.SB ]);
var SE_BUF = new Buffer([ COMMANDS.SE ]);
var IAC_SE_BUF = new Buffer([ COMMANDS.IAC, COMMANDS.SE ]);
var COMMAND_NAMES = Object.keys(COMMANDS).reduce(function(names, name) {
names[COMMANDS[name]] = name.toLowerCase();
return names;
}, {});
var COMMAND_IMPLS = {};
['do', 'dont', 'will', 'wont', 'sb'].forEach(function(command) {
var code = COMMANDS[command.toUpperCase()];
COMMAND_IMPLS[code] = function(bufs, i, event) {
if(bufs.length < (i + 1)) {
return MORE_DATA_REQUIRED;
}
return parseOption(bufs, i, event);
}
});
// :TODO: See TooTallNate's telnet.js: Handle COMMAND_IMPL for IAC in binary mode
// Create option names such as 'transmit binary' -> OPTIONS.TRANSMIT_BINARY
var OPTION_NAMES = Object.keys(OPTIONS).reduce(function(names, name) {
names[OPTIONS[name]] = name.toLowerCase().replace(/_/g, ' ');
return names;
}, {});
var OPTION_IMPLS = {};
// :TODO: fill in the rest...
OPTION_IMPLS.NO_ARGS =
OPTION_IMPLS[OPTIONS.ECHO] =
OPTION_IMPLS[OPTIONS.STATUS] =
OPTION_IMPLS[OPTIONS.LINEMODE] =
OPTION_IMPLS[OPTIONS.TRANSMIT_BINARY] =
OPTION_IMPLS[OPTIONS.AUTHENTICATION] =
OPTION_IMPLS[OPTIONS.TERMINAL_SPEED] =
OPTION_IMPLS[OPTIONS.REMOTE_FLOW_CONTROL] =
OPTION_IMPLS[OPTIONS.X_DISPLAY_LOCATION] =
OPTION_IMPLS[OPTIONS.SUPPRESS_GO_AHEAD] = function(bufs, i, event) {
event.buf = bufs.splice(0, i).toBuffer();
return event;
};
OPTION_IMPLS[OPTIONS.TERMINAL_TYPE] = function(bufs, i, event) {
if(event.commandCode !== COMMANDS.SB) {
OPTION_IMPLS.NO_ARGS(bufs, i, event);
} else {
// We need 4 bytes header + data + IAC SE
if(bufs.length < 7) {
return MORE_DATA_REQUIRED;
}
var end = bufs.indexOf(IAC_SE_BUF, 5); // look past header bytes
if(-1 === end) {
return MORE_DATA_REQUIRED;
}
// eat up and process the header
var buf = bufs.splice(0, 4).toBuffer();
binary.parse(buf)
.word8('iac1')
.word8('sb')
.word8('ttype')
.word8('is')
.tap(function(vars) {
assert(vars.iac1 === COMMANDS.IAC);
assert(vars.sb === COMMANDS.SB);
assert(vars.ttype === OPTIONS.TERMINAL_TYPE);
assert(vars.is === SB_COMMANDS.IS);
});
// eat up the rest
end -= 4;
buf = bufs.splice(0, end).toBuffer();
//
// From this point -> |end| is our ttype
//
// Look for trailing NULL(s). Client such as Netrunner do this.
//
var trimAt = 0;
for(; trimAt < buf.length; ++trimAt) {
if(0x00 === buf[trimAt]) {
break;
}
}
event.ttype = buf.toString('ascii', 0, trimAt);
// pop off the terminating IAC SE
bufs.splice(0, 2);
}
return event;
};
OPTION_IMPLS[OPTIONS.WINDOW_SIZE] = function(bufs, i, event) {
if(event.commandCode !== COMMANDS.SB) {
OPTION_IMPLS.NO_ARGS(bufs, i, event);
} else {
// we need 9 bytes
if(bufs.length < 9) {
return MORE_DATA_REQUIRED;
}
event.buf = bufs.splice(0, 9).toBuffer();
binary.parse(event.buf)
.word8('iac1')
.word8('sb')
.word8('naws')
.word16bu('width')
.word16bu('height')
.word8('iac2')
.word8('se')
.tap(function(vars) {
assert(vars.iac1 == COMMANDS.IAC);
assert(vars.sb == COMMANDS.SB);
assert(vars.naws == OPTIONS.WINDOW_SIZE);
assert(vars.iac2 == COMMANDS.IAC);
assert(vars.se == COMMANDS.SE);
event.cols = event.columns = event.width = vars.width;
event.rows = event.height = vars.height;
});
}
return event;
};
// Build an array of delimiters for parsing NEW_ENVIRONMENT[_DEP]
var NEW_ENVIRONMENT_DELIMITERS = [];
Object.keys(NEW_ENVIRONMENT_COMMANDS).forEach(function onKey(k) {
NEW_ENVIRONMENT_DELIMITERS.push(NEW_ENVIRONMENT_COMMANDS[k]);
});
// Handle the deprecated RFC 1408 & the updated RFC 1572:
OPTION_IMPLS[OPTIONS.NEW_ENVIRONMENT_DEP] =
OPTION_IMPLS[OPTIONS.NEW_ENVIRONMENT] = function(bufs, i, event) {
if(event.commandCode !== COMMANDS.SB) {
OPTION_IMPLS.NO_ARGS(bufs, i, event);
} else {
// We need 4 bytes header + payload + IAC SE
if(bufs.length < 7) {
return MORE_DATA_REQUIRED;
}
var end = bufs.indexOf(IAC_SE_BUF, 5); // look past header bytes
if(-1 === end) {
return MORE_DATA_REQUIRED;
}
// eat up and process the header
var buf = bufs.splice(0, 4).toBuffer();
binary.parse(buf)
.word8('iac1')
.word8('sb')
.word8('newEnv')
.word8('isOrInfo') // initial=IS, updates=INFO
.tap(function(vars) {
assert(vars.iac1 === COMMANDS.IAC);
assert(vars.sb === COMMANDS.SB);
assert(vars.newEnv === OPTIONS.NEW_ENVIRONMENT || vars.newEnv === OPTIONS.NEW_ENVIRONMENT_DEP);
assert(vars.isOrInfo === SB_COMMANDS.IS || vars.isOrInfo === SB_COMMANDS.INFO);
event.type = vars.isOrInfo;
if(vars.newEnv === OPTIONS.NEW_ENVIRONMENT_DEP) {
Log.warn('Handling deprecated RFC 1408 NEW-ENVIRON');
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}
});
// eat up the rest
end -= 4;
buf = bufs.splice(0, end).toBuffer();
//
// This part can become messy. The basic spec is:
// IAC SB NEW-ENVIRON IS type ... [ VALUE ... ] [ type ... [ VALUE ... ] [ ... ] ] IAC SE
//
// See RFC 1572 @ http://www.faqs.org/rfcs/rfc1572.html
//
// Start by splitting up the remaining buffer. Keep the delimiters
// as prefixes we can use for processing.
//
// :TODO: Currently not supporting ESCaped values (ESC + <type>). Probably not really in the wild, but we should be compliant
var params = [];
var p = 0;
for(var j = 0, l = buf.length; j < l; ++j) {
if(NEW_ENVIRONMENT_DELIMITERS.indexOf(buf[j]) === -1) {
continue;
}
params.push(buf.slice(p, j));
p = j;
}
// remainder
if(p < l) {
params.push(buf.slice(p, l));
}
var varName;
event.envVars = {};
// :TODO: handle cases where a variable was present in a previous exchange, but missing here...e.g removed
for(var j = 0; j < params.length; ++j) {
if(params[j].length < 2) {
continue;
}
var cmd = params[j].readUInt8();
if(cmd === NEW_ENVIRONMENT_COMMANDS.VAR || cmd === NEW_ENVIRONMENT_COMMANDS.USERVAR) {
varName = params[j].slice(1).toString('utf8'); // :TODO: what encoding should this really be?
} else {
event.envVars[varName] = params[j].slice(1).toString('utf8'); // :TODO: again, what encoding?
}
}
// pop off remaining IAC SE
bufs.splice(0, 2);
}
return event;
};
var MORE_DATA_REQUIRED = 0xfeedface;
function parseBufs(bufs) {
assert(bufs.length >= 2);
assert(bufs.get(0) === COMMANDS.IAC)
return parseCommand(bufs, 1, {});
}
function parseCommand(bufs, i, event) {
var command = bufs.get(i); // :TODO: fix deprecation... [i] is not the same
event.commandCode = command;
event.command = COMMAND_NAMES[command];
var handler = COMMAND_IMPLS[command];
if(handler) {
//return COMMAND_IMPLS[command](bufs, i + 1, event);
return handler(bufs, i + 1, event);
} else {
assert(2 == bufs.length); // IAC + COMMAND
event.buf = bufs.splice(0, 2).toBuffer();
return event;
}
}
function parseOption(bufs, i, event) {
var option = bufs.get(i); // :TODO: fix deprecation... [i] is not the same
event.optionCode = option;
event.option = OPTION_NAMES[option];
return OPTION_IMPLS[option](bufs, i + 1, event);
}
function TelnetClient(input, output) {
baseClient.Client.apply(this, arguments);
var self = this;
var bufs = buffers();
this.bufs = bufs;
var readyFired = false;
var encodingSet = false;
this.negotiationsComplete = false; // are we in the 'negotiation' phase?
this.didReady = false; // have we emit the 'ready' event?
this.input.on('data', function onData(b) {
bufs.push(b);
var i;
while((i = bufs.indexOf(IAC_BUF)) >= 0) {
// :TODO: Android client Irssi ConnectBot asserts here:
assert(bufs.length > (i + 1), 'bufs.length=' + bufs.length + ' i=' + i + ' bufs=' + bufs);
if(i > 0) {
self.emit('data', bufs.splice(0, i).toBuffer());
}
i = parseBufs(bufs);
if(MORE_DATA_REQUIRED === i) {
break;
} else {
//self.emit('event', i); // generic event
//self.emit(i.command, i); // "will", "wont", ...
if(i.option) {
self.emit(i.option, i); // "transmit binary", "echo", ...
}
self.handleTelnetEvent(i);
if(i.data) {
self.emit('data', i.data);
}
}
}
if(MORE_DATA_REQUIRED !== i && bufs.length > 0) {
//
// Standard data payload. This can still be "non-user" data
// such as ANSI control, but we don't handle that here.
//
self.emit('data', bufs.splice(0).toBuffer());
}
});
this.input.on('end', function() {
self.emit('end');
});
}
util.inherits(TelnetClient, baseClient.Client);
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///////////////////////////////////////////////////////////////////////////////
// Telnet Command/Option handling
///////////////////////////////////////////////////////////////////////////////
TelnetClient.prototype.handleTelnetEvent = function(evt) {
// handler name e.g. 'handleWontCommand'
var handlerName = 'handle' + evt.command.charAt(0).toUpperCase() + evt.command.substr(1) + 'Command';
if(this[handlerName]) {
// specialized
this[handlerName](evt);
} else {
// generic-ish
this.handleMiscCommand(evt);
}
};
TelnetClient.prototype.handleWillCommand = function(evt) {
if('terminal type' === evt.option) {
//
// See RFC 1091 @ http://www.faqs.org/rfcs/rfc1091.html
//
this.requestTerminalType();
} else if('environment variables' === evt.option) {
//
// See RFC 1572 @ http://www.faqs.org/rfcs/rfc1572.html
//
this.requestEnvironmentVariables();
} else {
// :TODO: temporary:
console.log('will ' + JSON.stringify(evt));
}
};
TelnetClient.prototype.handleWontCommand = function(evt) {
console.log('wont ' + JSON.stringify(evt));
};
TelnetClient.prototype.handleDoCommand = function(evt) {
// :TODO: handle the rest, e.g. echo nd the like
if('linemode' === evt.option) {
//
// Client wants to enable linemode editing. Denied.
//
this.wont.linemode();
} else if('encrypt' === evt.option) {
//
// Client wants to enable encryption. Denied.
//
this.wont.encrypt();
} else {
// :TODO: temporary:
console.log('do ' + JSON.stringify(evt));
}
};
TelnetClient.prototype.handleDontCommand = function(evt) {
console.log('dont ' + JSON.stringify(evt));
};
TelnetClient.prototype.setTermType = function(ttype) {
this.term.env['TERM'] = ttype;
this.term.termType = ttype;
Log.debug({ termType : ttype }, 'Set terminal type');
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}
TelnetClient.prototype.handleSbCommand = function(evt) {
var self = this;
if('terminal type' === evt.option) {
//
// See RFC 1091 @ http://www.faqs.org/rfcs/rfc1091.html
//
// :TODO: According to RFC 1091 @ http://www.faqs.org/rfcs/rfc1091.html
// We should keep asking until we see a repeat. From there, determine the best type/etc.
self.setTermType(evt.ttype);
self.negotiationsComplete = true; // :TODO: throw in a array of what we've taken care. Complete = array satisified or timeout
if(!self.didReady) {
self.didReady = true;
self.emit('ready');
}
} else if('new environment' === evt.option) {
//
// Handling is as follows:
// * Map 'TERM' -> 'termType' and only update if ours is 'unknown'
// * Map COLUMNS -> 'termWidth' and only update if ours is 0
// * Map ROWS -> 'termHeight' and only update if ours is 0
// * Add any new variables, ignore any existing
//
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Object.keys(evt.envVars).forEach(function onEnv(name) {
if('TERM' === name && 'unknown' === self.term.termType) {
self.setTermType(evt.envVars[name]);
} else if('COLUMNS' === name && 0 === self.term.termWidth) {
self.term.termWidth = parseInt(evt.envVars[name]);
Log.debug({ termWidth : self.term.termWidth, updateSource : 'NEW-ENVIRON'}, 'Window width updated');
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} else if('ROWS' === name && 0 === self.term.termHeight) {
self.term.termHeight = parseInt(evt.envVars[name]);
Log.debug({ termHeight : self.term.termHeight, updateSource : 'NEW-ENVIRON'}, 'Window height updated');
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} else {
if(name in self.term.env) {
assert(evt.type === SB_COMMANDS.INFO);
Log.warn(
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{ varName : name, value : evt.envVars[name], existingValue : self.term.env[name] },
'Environment variable already exists');
} else {
self.term.env[name] = evt.envVars[name];
}
}
});
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} else if('window size' === evt.option) {
//
// Update termWidth & termHeight.
// Set LINES and COLUMNS environment variables as well.
//
self.term.termWidth = evt.width;
self.term.termHeight = evt.height;
if(evt.width > 0) {
self.term.env['COLUMNS'] = evt.height;
}
if(evt.height > 0) {
self.term.env['ROWS'] = evt.height;
}
Log.debug({ termWidth : evt.width , termHeight : evt.height, updateSource : 'NAWS' }, 'Window size updated');
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} else {
console.log('unhandled SB: ' + JSON.stringify(evt));
}
};
var IGNORED_COMMANDS = [];
[ COMMANDS.EL, COMMANDS.GA, COMMANDS.NOP, COMMANDS.DM, COMMANDS.BRK ].forEach(function onCommandCode(cc) {
IGNORED_COMMANDS.push(cc);
});
TelnetClient.prototype.handleMiscCommand = function(evt) {
assert(evt.command !== 'undefined' && evt.command.length > 0);
//
// See:
// * RFC 854 @ http://tools.ietf.org/html/rfc854
//
if('ip' === evt.command) {
// Interrupt Process (IP)
Log.debug('Interrupt Process (IP) - Ending');
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this.input.end();
} else if('ayt' === evt.command) {
this.output.write('\b');
Log.debug('Are You There (AYT) - Replied "\\b"');
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} else if(IGNORED_COMMANDS.indexOf(evt.commandCode)) {
Log.debug({ evt : evt }, 'Ignoring command');
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} else {
Log.warn({ evt : evt }, 'Unknown command');
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}
};
TelnetClient.prototype.requestTerminalType = function() {
var buf = Buffer([ COMMANDS.IAC, COMMANDS.SB, OPTIONS.TERMINAL_TYPE, SB_COMMANDS.SEND, COMMANDS.IAC, COMMANDS.SE ]);
/*
var buf = Buffer(6);
buf[0] = COMMANDS.IAC;
buf[1] = COMMANDS.SB;
buf[2] = OPTIONS.TERMINAL_TYPE;
buf[3] = SB_COMMANDS.SEND;
buf[4] = COMMANDS.IAC;
buf[5] = COMMANDS.SE;
*/
return this.output.write(buf);
};
var WANTED_ENVIRONMENT_VARIABLES = [ 'LINES', 'COLUMNS', 'TERM' ];
TelnetClient.prototype.requestEnvironmentVariables = function() {
var bufs = buffers();
bufs.push(new Buffer([ COMMANDS.IAC, COMMANDS.SB, OPTIONS.NEW_ENVIRONMENT, SB_COMMANDS.SEND ]));
for(var i = 0; i < WANTED_ENVIRONMENT_VARIABLES.length; ++i) {
bufs.push(new Buffer( [ ENVIRONMENT_VARIABLES_COMMANDS.VAR ]));
bufs.push(new Buffer(WANTED_ENVIRONMENT_VARIABLES[i])); // :TODO: encoding here?! UTF-8 will work, but shoudl be more explicit
}
bufs.push(new Buffer([ COMMANDS.IAC, COMMANDS.SE ]));
return this.output.write(bufs.toBuffer());
};
TelnetClient.prototype.banner = function() {
// :TODO: See x84 implementation here.
// First, we should probably buffer then send.
this.will.echo();
this.will.suppress_go_ahead();
this.do.suppress_go_ahead();
this.do.transmit_binary();
this.will.transmit_binary();
this.do.terminal_type();
this.do.window_size();
this.do.new_environment();
}
function Command(command, client) {
this.command = COMMANDS[command.toUpperCase()];
this.client = client;
};
// Create Command objects with echo, transmit_binary, ...
Object.keys(OPTIONS).forEach(function(name) {
var code = OPTIONS[name];
Command.prototype[name.toLowerCase()] = function() {
var buf = Buffer(3);
buf[0] = COMMANDS.IAC;
buf[1] = this.command;
buf[2] = code;
return this.client.output.write(buf);
}
});
// Create do, dont, etc. methods on Client
['do', 'dont', 'will', 'wont'].forEach(function(command) {
function get() {
return new Command(command, this);
}
Object.defineProperty(TelnetClient.prototype, command, {
get : get,
enumerable : true,
configurable : true
});
});
/*
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function createServer() {
var server = net.createServer(function onConnection(sock) {
var self = this;
var client = new TelnetClient(sock, sock);
client.banner();
self.emit('client', client);
});
return server;
}
*/
function TelnetServerModule() {
ServerModule.call(this);
}
util.inherits(TelnetServerModule, ServerModule);
TelnetServerModule.prototype.createServer = function() {
TelnetServerModule.super_.prototype.createServer.call(this);
var server = net.createServer(function onConnection(sock) {
var self = this;
var client = new TelnetClient(sock, sock);
client.banner();
self.emit('client', client);
});
return server;
};