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‎SimpleTelnetServer.cpp

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/*
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Telnet support for the ESP8266 Wifi.
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Copyright (c) 2016 Kenneth S. Davis, All rights reserved.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Extends supports of TelnetServer base class:
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RFC 1079 - TELNET TERMINAL SPEED OPTION
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*/
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#include "SimpleTelnetServer.h"
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SimpleTelnetServer::SimpleTelnetServer()
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{
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recvBufLen = 0;
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}
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SimpleTelnetServer::~SimpleTelnetServer()
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{
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end();
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}
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/*
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This example extends TelnetServer with additional RFC's.
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*/
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bool SimpleTelnetServer::_processOption(WiFiClient& client, ClientStruct& str)
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{
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// check with the base class first.....
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if (TelnetServer::_processOption(client, str))
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return true;
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if (str.clientState == Normal)
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{
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if (str.echo)
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{
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str.buffer[str.bufferLen] = str.opt0;
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str.bufferLen++;
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}
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recvBuffer[recvBufLen] = str.opt0;
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recvBufLen++;
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return true;
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}
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if (str.clientState == InTelnetOpt0)
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{
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switch (str.opt0)
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{
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case TELNET_AYT:
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{
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// send a '.'
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str.buffer[str.bufferLen] = '.';
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str.bufferLen++;
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str.clientState = Normal;
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return true;
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}
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case TELNET_BRK: // break cmd
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case TELNET_AO: // abort output
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case TELNET_NOP: // Nop
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case TELNET_DM: // Data mark
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case TELNET_GA: // Go-ahead flow-control
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{
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#ifdef DEBUG_TELNET
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DEBUG_TELNET.print("Unsupported telnet option:");
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DEBUG_TELNET.println(str.opt0, HEX);
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#endif
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return false;
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}
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case TELNET_EC: // erase last character
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{
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if (str.echo)
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{
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if (str.buffer[str.bufferLen] > 0)
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{
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str.buffer[str.bufferLen] = 0;
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str.bufferLen--;
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}
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}
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_clientStr.clientState = Normal;
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return true;
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}
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case TELNET_EL: // erase current line
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{
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#ifdef DEBUG_TELNET
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DEBUG_TELNET.print("Unsupported telnet option:");
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DEBUG_TELNET.println(str.opt0, HEX);
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#endif
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_clientStr.clientState = Normal;
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return true;
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}
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case TELNET_IP: // interrupt process ---- what to do...?
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{
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#ifdef DEBUG_TELNET
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DEBUG_TELNET.print("Unsupported telnet option:");
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DEBUG_TELNET.println(str.opt0, HEX);
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#endif
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_clientStr.clientState = Normal;
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return true;
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}
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default:
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{
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#ifdef DEBUG_TELNET
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DEBUG_TELNET.print("Unknown telnet option:");
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DEBUG_TELNET.println(str.opt0, HEX);
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#endif
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return false;
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}
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}
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}
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if (str.clientState == InTelnetOpt1)
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{
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switch (str.opt1)
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{
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// extend for RFC 1079 - TELNET TERMINAL SPEED OPTION, also needed
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// to add subnegotiation support for this.
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case TELNET_OPTION_TERMINAL_SPEED:
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{
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if (str.opt0 == TELNET_WILL)
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{
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str.buffer[str.bufferLen] = TELNET_IAC;
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str.bufferLen++;
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str.buffer[str.bufferLen] = TELNET_DO;
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str.bufferLen++;
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str.buffer[str.bufferLen] = str.opt1;
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str.bufferLen++;
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}
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else if (_clientStr.opt0 == TELNET_DO)
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{
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str.buffer[str.bufferLen] = TELNET_IAC;
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str.bufferLen++;
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str.buffer[str.bufferLen] = TELNET_WILL;
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str.bufferLen++;
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str.buffer[str.bufferLen] = str.opt1;
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str.bufferLen++;
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}
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str.clientState = Normal;
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return true;
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}
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default:
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{
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return false;
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}
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}
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}
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return false;
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}
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bool SimpleTelnetServer::_processSubNegotiation(WiFiClient &client, struct ClientStruct &str)
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{
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// we have captured a sb block:
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// IAC SB [ captured ] IAC SE
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if (TelnetServer::_processSubNegotiation(client, str))
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return true;
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switch (str.negoBuffer[0])
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{
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case TELNET_OPTION_TERMINAL_SPEED:
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{
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int txSpeed = 9600;
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int rxSpeed = 9600;
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if (str.negoBuffer[1] == 1)
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{
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str.buffer[str.bufferLen++] = TELNET_IAC;
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str.buffer[str.bufferLen++] = TELNET_SB;
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str.buffer[str.bufferLen++] = TELNET_OPTION_TERMINAL_SPEED;
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str.buffer[str.bufferLen++] = 0;
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str.bufferLen += sprintf((char*)&str.buffer[str.bufferLen], "%d,%d", txSpeed, rxSpeed);
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str.buffer[str.bufferLen++] = TELNET_IAC;
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str.buffer[str.bufferLen] = TELNET_SE;
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#ifdef DEBUG_TELNET
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DEBUG_TELNET.println("SB TERMINAL SPEED");
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for (int i = 0; i < str.bufferLen; i++)
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{
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DEBUG_TELNET.print(str.buffer[i], HEX);
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DEBUG_TELNET.print(" ");
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}
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DEBUG_TELNET.println();
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#endif
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str.negoBufferLen = 0;
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return true;
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}
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break;
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}
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default:
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return false;
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}
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return false;
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}

‎SimpleTelnetServer.h

Lines changed: 81 additions & 0 deletions
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/*
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Telnet support for the ESP8266 Wifi.
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Copyright (c) 2016 Kenneth S. Davis, All rights reserved.
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5+
This library is free software; you can redistribute it and/or
6+
modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
9+
10+
This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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15+
You should have received a copy of the GNU Lesser General Public
16+
License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Extends supports of TelnetServer base class:
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RFC 857 - TELNET ECHO OPTION
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RFC 858 - TELNET SUPPRESS GO AHEAD OPTION
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RFC 1079 - TELNET TERMINAL SPEED OPTION
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*/
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#ifndef _SIMPLETELNETSERVER_h
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#define _SIMPLETELNETSERVER_h
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#if defined(ARDUINO) && ARDUINO >= 100
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#include "arduino.h"
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#else
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#include "WProgram.h"
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#endif
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#include "Telnet.h"
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// telnet options
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#define TELNET_OPTION_TERMINAL_SPEED 32
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// Future work
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//#define TELNET_OPTION_COM_PORT 44
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/*
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// Future work
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#define TELNET_COM_PORT_OPTION_SIG
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#define TELNET_COM_PORT_SET_BAUDRATE "1"
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#define TELNET_COM_PORT_SET_DATASIZE "2"
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#define TELNET_COM_PORT_SET_PARITY "3"
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#define TELNET_COM_PORT_SET_STOPSIZE "4"
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#define TELNET_COM_PORT_SET_CONTROL "5"
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#define TELNET_COM_PORT_NOTFY_LINESTATE "6"
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#define TELNET_COM_PORT_NOTFY_MODEMSTATE "7"
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#define TELNET_COM_PORT_FLOW_SUSPEND "8"
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#define TELNET_COM_PORT_FLOW_RESUME "9"
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#define TELNET_COM_PORT_LINE_MASK "10"
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#define TELNET_COM_PORT_MODEM_MASK "11"
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#define TELNET_COM_PORT_PURGE "12"
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*/
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class SimpleTelnetServer : public TelnetServer
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{
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public:
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SimpleTelnetServer();
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virtual ~SimpleTelnetServer();
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uint8_t recvBuffer[1024];
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uint8_t recvBufLen;
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protected:
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virtual bool _processSubNegotiation(WiFiClient &client, struct ClientStruct &str);
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virtual bool _processOption(WiFiClient &client, struct ClientStruct &str);
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};
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#endif
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