net/base/telnet_server.h

   1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef NET_BASE_TELNET_SERVER_H_
   6 #define NET_BASE_TELNET_SERVER_H_
   7
   8 #include "net/base/listen_socket.h"
   9
  10 // Implements the telnet protocol on top of the raw socket interface.
  11 // DidRead calls to the delegate are buffered on a line by line basis.
  12 // (for now this means that basic line editing is handled in this object)
  13 class TelnetServer : public ListenSocket {
  14 public:
  15   static TelnetServer* Listen(std::string ip, int port,
  16                               ListenSocketDelegate *del);
  17
  18 protected:
  19   void Listen() { ListenSocket::Listen(); }
  20   virtual void Read();
  21   virtual void Accept();
  22   virtual void SendInternal(const char* bytes, int len);
  23
  24 private:
  25   enum TelnetInputState {
  26     // Currently not processing any IAC or ESC sequence.
  27     NOT_IN_IAC_OR_ESC_SEQUENCE,
  28     // Received carriage return (CR) expecting new line (LF).
  29     EXPECTING_NEW_LINE,
  30     // Processing IAC expecting command.
  31     EXPECTING_COMMAND,
  32     // Processing IAC expecting option.
  33     EXPECTING_OPTION,
  34     // Inside subnegoation IAC,SE will end it.
  35     SUBNEGOTIATION_EXPECTING_IAC,
  36     // Ending subnegoation expecting SE.
  37     SUBNEGOTIATION_EXPECTING_SE,
  38     // Processing ESC sequence.
  39     EXPECTING_FIRST_ESC_CHARACTER,
  40     // Processing ESC sequence with two characters.
  41     EXPECTING_SECOND_ESC_CHARACTER,
  42     // Processing "ESC [" sequence.
  43     EXPECTING_NUMBER_SEMICOLON_OR_END
  44   };
  45
  46   TelnetServer(SOCKET s, ListenSocketDelegate* del);
  47   virtual ~TelnetServer();
  48
  49   // telnet commands
  50   void SendIAC(int command, int option);
  51   void StateMachineStep(unsigned char c);
  52
  53   TelnetInputState input_state_;
  54   int iac_command_;  // Last command read.
  55   int iac_option_;  // Last option read.
  56   std::string command_line_;
  57
  58   DISALLOW_EVIL_CONSTRUCTORS(TelnetServer);
  59 };
  60
  61 #endif // NET_BASE_TELNET_SERVER_H_