telnet samples

MySolution/ConsoleApp/TelnetSamples/SocketTelnetClient.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net;
+using System.Net.Sockets;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ConsoleApp.TelnetSamples
+{
+	public class SocketTelnetClient : ITelnetClient
+	{
+		private Socket _socket;
+
+        public string Connect(string ip, int port = 23)
+		{
+			try
+			{
+				Close();
+
+				_socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
+				_socket.ReceiveTimeout = 1000;
+
+				IPAddress ipAddress = IPAddress.Parse(ip);
+				IPEndPoint ipEndPoint = new IPEndPoint(ipAddress, port);
+				_socket.Connect(ipEndPoint);
+
+				return Read();
+			}
+			catch (Exception)
+			{
+				throw;
+			}
+		}
+
+        public string Read()
+        {
+			StringBuilder sb = new StringBuilder();
+			byte[] readBuffer = new byte[1024];
+            while (true)
+            {
+				int bytesRead = _socket.Receive(readBuffer);
+                if (bytesRead < 1)
+                    break;
+
+				string data = Encoding.ASCII.GetString(readBuffer, 0, bytesRead);
+				sb.Append(data);
+
+				if (data.EndsWith("\r\n>"))
+					break;
+
+				Thread.Sleep(50);
+			}
+
+			// 에코 삭제
+			string read = sb.ToString();
+			int rnIdx = read.IndexOf("\r\n");
+
+			return read.Substring(rnIdx + 1);
+		}
+
+		public string SendCommand(string command)
+		{
+			try
+			{
+				command += "\r\n";
+				byte[] sendBytes = Encoding.ASCII.GetBytes(command);
+				_socket.Send(sendBytes);
+
+				return Read();
+			}
+			catch (Exception)
+			{
+				throw;
+			}
+		}
+
+		public void Close()
+        {
+            try
+            {
+				if (_socket == null)
+                    return;
+
+				_socket.Shutdown(SocketShutdown.Both);
+				_socket.Close();
+				_socket.Dispose();
+			}
+            catch (Exception)
+            {
+                throw;
+            }
+        }
+    }
+}