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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_BASE_TELNET_SERVER_H_
#define NET_BASE_TELNET_SERVER_H_
#include "net/base/listen_socket.h"
// Implements the telnet protocol on top of the raw socket interface.
// DidRead calls to the delegate are buffered on a line by line basis.
// (for now this means that basic line editing is handled in this object)
class TelnetServer : public ListenSocket {
public:
static TelnetServer* Listen(std::string ip, int port,
ListenSocketDelegate *del);
virtual ~TelnetServer();
protected:
void Listen() { ListenSocket::Listen(); }
virtual void Read();
virtual void Accept();
virtual void SendInternal(const char* bytes, int len);
private:
enum TelnetInputState {
NOT_IN_IAC_OR_ESC_SEQUENCE, // Currently not processing any IAC or ESC sequence.
EXPECTING_NEW_LINE, // Received carriage return (CR) expecting new line (LF).
EXPECTING_COMMAND, // Processing IAC expecting command.
EXPECTING_OPTION, // Processing IAC expecting option.
SUBNEGOTIATION_EXPECTING_IAC, // Inside subnegoation IAC,SE will end it.
SUBNEGOTIATION_EXPECTING_SE, // Ending subnegoation expecting SE.
EXPECTING_FIRST_ESC_CHARACTER, // Processing ESC sequence.
EXPECTING_SECOND_ESC_CHARACTER, // Processing ESC sequence with two characters
EXPECTING_NUMBER_SEMICOLON_OR_END // Processing "ESC [" sequence.
};
TelnetServer(SOCKET s, ListenSocketDelegate* del);
// telnet commands
void SendIAC(int command, int option);
void StateMachineStep(unsigned char c);
TelnetInputState input_state_;
int iac_command_; // Last command read.
int iac_option_; // Last option read.
std::string command_line_;
DISALLOW_EVIL_CONSTRUCTORS(TelnetServer);
};
#endif // BASE_TELNET_SERVER_H_
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