/// <summary>
/// 处理Telnet命令并返回数据
/// </summary>
/// <param name="recv"></param>
/// <param name="send"></param>
/// <param name="data"></param>
void ParseTelnetCommand(RingQueue <byte> recv, RingQueue <byte> send, RingQueue <byte> data)
{
while (recv.Count > 0 && data.Available > 0)
{
var b = recv.Shift();
if (b == IAC)
{
//命令处理
if (recv.Count < 2)
{
recv.Unshift(b);
break;
}
var action = recv.Shift();
var option = recv.Shift();
switch (option)
{
case ECHO:
case NOGA:
case TERMTYPE:
case NAWS:
switch (action)
{
case WILL:
send.PushValues(new byte[] { IAC, DO, option });
break;
case DO:
send.PushValues(new byte[] { IAC, WILL, option });
break;
case SB:
switch (option)
{
case TERMTYPE:
if (recv.Count < 3)
{
recv.UnshiftValues(new byte[] { option, action, b });
break;
}
if (recv.Shift() == 1)
{
recv.Shift(); recv.Shift();
//发送客户端型号
send.PushValues(new byte[] { IAC, SB, TERMTYPE, 0 });
send.PushValues(Encoding.Default.GetBytes(TermType));
send.PushValues(new byte[] { IAC, SE });
}
break;
}
break;
}
if (action == WILL && option == NAWS)
{
//发送窗体大小
send.PushValues(new byte[] { IAC, SB, NAWS,
(byte)((ScreenColumns >> 8) & 0xFF), (byte)(ScreenColumns & 0xFF),
(byte)((ScreenRows >> 8) & 0xFF), (byte)(ScreenRows & 0xFF), IAC, SE });
}
break;
default:
//拒绝其他一切选项
switch (action)
{
case WILL:
case WONT:
send.PushValues(new byte[] { IAC, DONT, option });
break;
case DO:
case DONT:
send.PushValues(new byte[] { IAC, WONT, option });
break;
}
break;
}
}
else
{
//丢给VT220解析器
data.Push(b);
}
}
}
/// <summary>
/// 进入消息等待
/// </summary>
public void Process()
{
//用户发送队列
m_userQueue = new RingQueue <byte>(1024);
//vt220待解析数据
m_telnetDataQueue = new RingQueue <byte>(8192);
//消息处理
new System.Threading.Thread(new System.Threading.ThreadStart(delegate()
{
//接收缓存队列
var recvQueue = new RingQueue <byte>(8192);
//发送缓存队列
var sendQueue = new RingQueue <byte>(1024);
var io = m_conn.GetStream();
var sendStream = new System.IO.BufferedStream(io);
var recvStream = new System.IO.BufferedStream(io);
while (m_conn != null && m_conn.Connected)
{
//接收服务端数据
while (io.DataAvailable && recvQueue.Available > 0)
{
var b = io.ReadByte();
if (b == -1)
{
break;
}
recvQueue.Push((byte)b);
}
//解析Telnet协议 并 响应服务器
ParseTelnetCommand(recvQueue, sendQueue, m_telnetDataQueue);
//解析VT220协议
ParseVT220Command(m_telnetDataQueue);
//客户端发送数据
while (sendQueue.Count > 0 && m_conn.Connected)
{
var data = sendQueue.ToArray();
sendStream.Write(data, 0, data.Length);
sendStream.Flush();
sendQueue.Clear();
}
//发送用户数据
while (m_userQueue.Count > 0 && m_conn.Connected)
{
var data = m_userQueue.ToArray();
sendStream.Write(data, 0, data.Length);
sendStream.Flush();
m_userQueue.Clear();
}
//休眠100ms(文件输出时20ms)
System.Threading.Thread.Sleep(IsPrinting?10:100);
//检测终止标志(不确定)
if (m_conn != null && m_conn.Client.Poll(1, SelectMode.SelectRead) && m_conn.Client.Available == 0)
{
this.Disconnect();
Logger.Info("Telnet 连接关闭(收到服务端指令)");
}
}
})).Start();
//绑定控件
//绑定用户输入事件
Screen.KeyPress += new System.Windows.Forms.KeyPressEventHandler(delegate(object sender, System.Windows.Forms.KeyPressEventArgs e)
{
m_userQueue.Push(Convert.ToByte(e.KeyChar));
});
Screen.KeyDown += new System.Windows.Forms.KeyEventHandler(delegate(object sender, System.Windows.Forms.KeyEventArgs e)
{
SendKey(e.KeyCode);
//Console.WriteLine(e.KeyCode);
});
//绑定用户输入事件
}