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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#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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