private bool ProcessMessage(ISessionData session, ISocketClient client, ISocketMessage message)
{
var user = _clientStates.Values.Where(c => c.ConnectionId == client.ConnectionId).SingleOrDefault();
byte[] bytes = message.GetRawBytes();
string result = (bytes[0]) switch
{
(byte)'/' => ProcessSlashCommand(user, session, client, ref bytes),
(byte)'?' => GetHelpText(),
_ => "Bad command or file name." // :)
};
client.Send(Encoding.ASCII.GetBytes(result + "\n"));
return(true);
}
private bool ProcessPendingAuth(ISessionData session, ISocketClient client, ISocketMessage message)
{
var user = _clientStates.Values.Where(c => c.ConnectionId == client.ConnectionId).SingleOrDefault();
//TODO: Error handling in chat server component
var msg = message.GetRawBytes();
if (msg.Length == 0 || msg.Length > 16)
{
client.Send(_("Invalid alias" + user.LinePrompt));
return(false);
}
user.Alias = Encoding.ASCII.GetString(msg);
user.Commands.Add(new JoinCommand()); //TODO: Populate commands based on access? Dunno
user.Commands.Add(new ListRoomsCommand());
client.Send(_($"Welcome {user.Alias}\n>"));
user.Flags = ChatStates.Connected | ChatStates.Authenticated;
return(true);
}
protected override void WhenReceiving(ISessionData session, ISocketClient client, ISocketMessage message)
{
/* <-- INCOMING -->
* 255 253 1 IAC DO ECHO
* 255 253 31 IAC DO NAWS
* 255 251 1 IAC WILL ECHO
* 255 251 3 IAC WILL SUPPRESS-GO-AHEAD
* */
/* <-- REPLY WITH -->
* 255 252 1 IAC WONT ECHO
* 255 252 31 IAC WONT NAWS
* 255 254 1 IAC DONT ECHO
* 255 254 3 IAC DONT SUPPRESS-GO-AHEAD
* */
// https://www.iana.org/assignments/telnet-options/telnet-options.xhtml
var options = new List <TelnetPacketOption>();
TelnetPacketOption option = null;
byte b;
byte lastByte = 0x00;
var pos = 0;
var bytes = message.GetRawBytes(); // so is this bytes 'by ref'?
if (message.FirstByte != B.Iac) // wrong B.Iac value, hell... could be wrong acronym even.
{
goto DoneWithOptions; // ignore the packet if it doesn't have any options? whatever
}
do
{
b = bytes[pos++]; // byte for the current position
if (b == B.Iac) // if it's an identifier for IAC then make a new option
{
Debug.Write("IAC ");
if (lastByte == b) // if two IAC bytes (255, 0xFF) then the next byte starts content (if I recall, will look it up)
{
break;
}
option = new TelnetPacketOption();
options.Add(option);
}
option.Declaration = (bytes[pos++]) switch
{
B.Will => TelnetDeclarations.Will,
B.Wont => TelnetDeclarations.Wont,
B.Do => TelnetDeclarations.Do,
B.Dont => TelnetDeclarations.Dont,
_ => TelnetDeclarations.None,
};
Debug.Write(Enum.GetName(typeof(TelnetDeclarations), option.Declaration) + " ");
option.Value = (bytes[pos++]) switch
{
(byte)TelnetOptions.Echo => TelnetOptions.Echo,
(byte)TelnetOptions.SupressGoAhead => TelnetOptions.SupressGoAhead,
(byte)TelnetOptions.FlowControl => TelnetOptions.FlowControl,
// moar
_ => TelnetOptions.Null,
};
Debug.WriteLine(Enum.GetName(typeof(TelnetOptions), option.Value));
lastByte = b;
}while (true);