protected override void NegotiateInbound(byte[] data, int numberOfBytes)
{
for (int i = 0; i < numberOfBytes; i++)
{
if (_TelnetNegotiationState == TelnetNegotiationState.Data)
{
if (data[i] == (byte)TelnetCommand.IAC)
{
_TelnetNegotiationState = TelnetNegotiationState.IAC;
}
else
{
AddToInputQueue(data[i]);
}
}
else if (_TelnetNegotiationState == TelnetNegotiationState.IAC)
{
if (data[i] == (byte)TelnetCommand.IAC)
{
_TelnetNegotiationState = TelnetNegotiationState.Data;
AddToInputQueue(data[i]);
}
else
{
switch ((TelnetCommand)data[i])
{
case TelnetCommand.NoOperation:
case TelnetCommand.DataMark:
case TelnetCommand.Break:
case TelnetCommand.InterruptProcess:
case TelnetCommand.AbortOutput:
case TelnetCommand.AreYouThere:
case TelnetCommand.EraseCharacter:
case TelnetCommand.EraseLine:
case TelnetCommand.GoAhead:
// TODO We recognize, but ignore these for now
_TelnetNegotiationState = TelnetNegotiationState.Data;
break;
case TelnetCommand.Do: _TelnetNegotiationState = TelnetNegotiationState.Do; break;
case TelnetCommand.Dont: _TelnetNegotiationState = TelnetNegotiationState.Dont; break;
case TelnetCommand.Will: _TelnetNegotiationState = TelnetNegotiationState.Will; break;
case TelnetCommand.Wont: _TelnetNegotiationState = TelnetNegotiationState.Wont; break;
case TelnetCommand.Subnegotiation:
_TelnetNegotiationState = TelnetNegotiationState.Subnegotiation;
_SubnegotiationData.Length = 0;
break;
default: _TelnetNegotiationState = TelnetNegotiationState.Data; break;
}
}
}
else if (_TelnetNegotiationState == TelnetNegotiationState.Do)
{
switch ((TelnetOption)data[i])
{
case TelnetOption.TransmitBinary: SendWill(data[i]); break;
case TelnetOption.Echo: SendWill(data[i]); break;
case TelnetOption.SuppressGoAhead: SendWill(data[i]); break;
case TelnetOption.WindowSize: SendWont(data[i]); break;
case TelnetOption.TerminalType: SendWont(data[i]); break;
case TelnetOption.LineMode: SendWont(data[i]); break;
default: SendWont(data[i]); break;
}
_TelnetNegotiationState = TelnetNegotiationState.Data;
}
else if (_TelnetNegotiationState == TelnetNegotiationState.Dont)
{
switch ((TelnetOption)data[i])
{
case TelnetOption.TransmitBinary: SendWill(data[i]); break;
case TelnetOption.Echo: SendWill(data[i]); break;
case TelnetOption.SuppressGoAhead: SendWill(data[i]); break;
case TelnetOption.WindowSize: SendWont(data[i]); break;
case TelnetOption.TerminalType: SendWont(data[i]); break;
case TelnetOption.LineMode: SendWont(data[i]); break;
default: SendWont(data[i]); break;
}
_TelnetNegotiationState = TelnetNegotiationState.Data;
}
else if (_TelnetNegotiationState == TelnetNegotiationState.Will)
{
switch ((TelnetOption)data[i])
{
case TelnetOption.TransmitBinary: SendDo(data[i]); break;
case TelnetOption.Echo: SendDont(data[i]); break;
case TelnetOption.SuppressGoAhead: SendDo(data[i]); break;
case TelnetOption.WindowSize: SendDont(data[i]); break;
case TelnetOption.TerminalType: SendSubnegotiate(data[i]); break;
case TelnetOption.LineMode: SendDont(data[i]); break;
default: SendDont(data[i]); break;
}
_TelnetNegotiationState = TelnetNegotiationState.Data;
}
else if (_TelnetNegotiationState == TelnetNegotiationState.Wont)
{
switch ((TelnetOption)data[i])
{
case TelnetOption.TransmitBinary: SendDont(data[i]); break;
case TelnetOption.Echo: SendDont(data[i]); break;
case TelnetOption.SuppressGoAhead: SendDo(data[i]); break;
case TelnetOption.WindowSize: SendDont(data[i]); break;
case TelnetOption.TerminalType: SendDont(data[i]); break;
case TelnetOption.LineMode: SendDont(data[i]); break;
default: SendDont(data[i]); break;
}
_TelnetNegotiationState = TelnetNegotiationState.Data;
}
// TODO Port to fTelnet, HtmlTerm
else if (_TelnetNegotiationState == TelnetNegotiationState.Subnegotiation)
{
// First byte of subnegotiation should be the option to negotiate
switch ((TelnetOption)data[i])
{
case TelnetOption.TerminalType:
case TelnetOption.WindowSize:
// Known option
_SubnegotiationOption = (TelnetOption)data[i];
break;
default:
// Unknown option
_SubnegotiationOption = TelnetOption.None;
break;
}
_TelnetNegotiationState = TelnetNegotiationState.SubnegotiationData;
}
else if (_TelnetNegotiationState == TelnetNegotiationState.SubnegotiationData)
{
// Add next byte to negotiation string, unless it's an IAC
switch ((TelnetCommand)data[i])
{
case TelnetCommand.IAC: _TelnetNegotiationState = TelnetNegotiationState.SubnegotiationIAC; break;
default: _SubnegotiationData.Append((char)data[i]); break;
}
}
else if (_TelnetNegotiationState == TelnetNegotiationState.SubnegotiationIAC)
{
// Check to see if negotiation has ended, or if it's just a doubled IAC
switch ((TelnetCommand)data[i])
{
case TelnetCommand.IAC:
// Doubled IAC means go back to data
_SubnegotiationData.Append((char)data[i]);
_TelnetNegotiationState = TelnetNegotiationState.SubnegotiationData;
break;
case TelnetCommand.EndSubnegotiation:
// Subnegotiation has ended
// TODO Do something with FSubnegotiationData based on FSubnegotiationOption
switch (_SubnegotiationOption)
{
case TelnetOption.TerminalType:
// TODO
break;
case TelnetOption.WindowSize:
// TODO
break;
}
_TelnetNegotiationState = TelnetNegotiationState.Data;
break;
default:
// Something unknown has happened
_TelnetNegotiationState = TelnetNegotiationState.Data;
break;
}
}
else
{
_TelnetNegotiationState = TelnetNegotiationState.Data;
}
}
}
protected override void NegotiateInbound(byte[] data, int numberOfBytes)
{
for (int i = 0; i < numberOfBytes; i++)
{
if (_TelnetNegotiationState == TelnetNegotiationState.Data)
{
if (data[i] == (byte)TelnetCommand.IAC)
{
_TelnetNegotiationState = TelnetNegotiationState.IAC;
}
else
{
AddToInputQueue(data[i]);
}
}
else if (_TelnetNegotiationState == TelnetNegotiationState.IAC)
{
if (data[i] == (byte)TelnetCommand.IAC)
{
_TelnetNegotiationState = TelnetNegotiationState.Data;
AddToInputQueue(data[i]);
}
else
{
switch ((TelnetCommand)data[i])
{
case TelnetCommand.NoOperation:
case TelnetCommand.DataMark:
case TelnetCommand.Break:
case TelnetCommand.InterruptProcess:
case TelnetCommand.AbortOutput:
case TelnetCommand.AreYouThere:
case TelnetCommand.EraseCharacter:
case TelnetCommand.EraseLine:
case TelnetCommand.GoAhead:
// TODO We recognize, but ignore these for now
_TelnetNegotiationState = TelnetNegotiationState.Data;
break;
case TelnetCommand.Do: _TelnetNegotiationState = TelnetNegotiationState.Do; break;
case TelnetCommand.Dont: _TelnetNegotiationState = TelnetNegotiationState.Dont; break;
case TelnetCommand.Will: _TelnetNegotiationState = TelnetNegotiationState.Will; break;
case TelnetCommand.Wont: _TelnetNegotiationState = TelnetNegotiationState.Wont; break;
case TelnetCommand.Subnegotiation:
_TelnetNegotiationState = TelnetNegotiationState.Subnegotiation;
_SubnegotiationData.Length = 0;
break;
default: _TelnetNegotiationState = TelnetNegotiationState.Data; break;
}
}
}
else if (_TelnetNegotiationState == TelnetNegotiationState.Do)
{
switch ((TelnetOption)data[i])
{
case TelnetOption.TransmitBinary: SendWill(data[i]); break;
case TelnetOption.Echo: SendWill(data[i]); break;
case TelnetOption.SuppressGoAhead: SendWill(data[i]); break;
case TelnetOption.WindowSize: SendWont(data[i]); break;
case TelnetOption.TerminalType: SendWont(data[i]); break;
case TelnetOption.LineMode: SendWont(data[i]); break;
default: SendWont(data[i]); break;
}
_TelnetNegotiationState = TelnetNegotiationState.Data;
}
else if (_TelnetNegotiationState == TelnetNegotiationState.Dont)
{
switch ((TelnetOption)data[i])
{
case TelnetOption.TransmitBinary: SendWill(data[i]); break;
case TelnetOption.Echo: SendWill(data[i]); break;
case TelnetOption.SuppressGoAhead: SendWill(data[i]); break;
case TelnetOption.WindowSize: SendWont(data[i]); break;
case TelnetOption.TerminalType: SendWont(data[i]); break;
case TelnetOption.LineMode: SendWont(data[i]); break;
default: SendWont(data[i]); break;
}
_TelnetNegotiationState = TelnetNegotiationState.Data;
}
else if (_TelnetNegotiationState == TelnetNegotiationState.Will)
{
switch ((TelnetOption)data[i])
{
case TelnetOption.TransmitBinary: SendDo(data[i]); break;
case TelnetOption.Echo: SendDont(data[i]); break;
case TelnetOption.SuppressGoAhead: SendDo(data[i]); break;
case TelnetOption.WindowSize: SendDont(data[i]); break;
case TelnetOption.TerminalType: SendSubnegotiate(data[i]); break;
case TelnetOption.LineMode: SendDont(data[i]); break;
default: SendDont(data[i]); break;
}
_TelnetNegotiationState = TelnetNegotiationState.Data;
}
else if (_TelnetNegotiationState == TelnetNegotiationState.Wont)
{
switch ((TelnetOption)data[i])
{
case TelnetOption.TransmitBinary: SendDont(data[i]); break;
case TelnetOption.Echo: SendDont(data[i]); break;
case TelnetOption.SuppressGoAhead: SendDo(data[i]); break;
case TelnetOption.WindowSize: SendDont(data[i]); break;
case TelnetOption.TerminalType: SendDont(data[i]); break;
case TelnetOption.LineMode: SendDont(data[i]); break;
default: SendDont(data[i]); break;
}
_TelnetNegotiationState = TelnetNegotiationState.Data;
}
// TODO Port to fTelnet, HtmlTerm
else if (_TelnetNegotiationState == TelnetNegotiationState.Subnegotiation)
{
// First byte of subnegotiation should be the option to negotiate
switch ((TelnetOption)data[i])
{
case TelnetOption.TerminalType:
case TelnetOption.WindowSize:
// Known option
_SubnegotiationOption = (TelnetOption)data[i];
break;
default:
// Unknown option
_SubnegotiationOption = TelnetOption.None;
break;
}
_TelnetNegotiationState = TelnetNegotiationState.SubnegotiationData;
}
else if (_TelnetNegotiationState == TelnetNegotiationState.SubnegotiationData)
{
// Add next byte to negotiation string, unless it's an IAC
switch ((TelnetCommand)data[i])
{
case TelnetCommand.IAC: _TelnetNegotiationState = TelnetNegotiationState.SubnegotiationIAC; break;
default: _SubnegotiationData.Append((char)data[i]); break;
}
}
else if (_TelnetNegotiationState == TelnetNegotiationState.SubnegotiationIAC)
{
// Check to see if negotiation has ended, or if it's just a doubled IAC
switch ((TelnetCommand)data[i])
{
case TelnetCommand.IAC:
// Doubled IAC means go back to data
_SubnegotiationData.Append((char)data[i]);
_TelnetNegotiationState = TelnetNegotiationState.SubnegotiationData;
break;
case TelnetCommand.EndSubnegotiation:
// Subnegotiation has ended
// TODO Do something with FSubnegotiationData based on FSubnegotiationOption
switch (_SubnegotiationOption)
{
case TelnetOption.TerminalType:
// TODO
break;
case TelnetOption.WindowSize:
// TODO
break;
}
_TelnetNegotiationState = TelnetNegotiationState.Data;
break;
default:
// Something unknown has happened
_TelnetNegotiationState = TelnetNegotiationState.Data;
break;
}
}
else
{
_TelnetNegotiationState = TelnetNegotiationState.Data;
}
}
}
// NB: The base class constructor calls InitSocket(), which means this method will run before this classes constructor, so
// everything accessed here needs to be initialized already (ie can't rely on the constructor to initialize it)
protected override void InitSocket()
{
base.InitSocket();
Array.Clear(_TelnetOptions, 0, _TelnetOptions.Length);
_TelnetNegotiationState = TelnetNegotiationState.Data;
}
// NB: The base class constructor calls InitSocket(), which means this method will run before this classes constructor, so
// everything accessed here needs to be initialized already (ie can't rely on the constructor to initialize it)
protected override void InitSocket()
{
base.InitSocket();
Array.Clear(_TelnetOptions, 0, _TelnetOptions.Length);
_TelnetNegotiationState = TelnetNegotiationState.Data;
}
