telnet samples

MySolution/ConsoleApp/TelnetSamples/ITelnetClinet.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ConsoleApp.TelnetSamples
+{
+	public interface ITelnetClient
+	{
+		string Connect(string ip, int port = 23);
+		string Read();
+		string SendCommand(string command);
+		void Close();
+	}
+}

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;
+            }
+        }
+    }
+}

MySolution/ConsoleApp/TelnetSamples/StreamTelnetClient.cs

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+using System;
+using System.Net.Sockets;
+using System.IO;
+using System.Text;
+using ConsoleApp.TelnetSamples;
+
+namespace Samples.Telnet
+{
+    public class StreamTelnetClient : ITelnetClient
+    {
+        private TcpClient _client;
+        private NetworkStream _stream;
+        private StreamReader _reader;
+        private StreamWriter _writer;
+
+        public string Connect(string ip, int port = 23)
+        {
+            try
+            {
+				Close();
+
+				_client = new TcpClient(ip, port);
+
+				// 스트림 생성
+				_stream = _client.GetStream();
+				_reader = new StreamReader(_stream);
+				_writer = new StreamWriter(_stream);
+				_writer.AutoFlush = true;
+
+				return Read();
+			}
+            catch (Exception)
+            {
+                throw;
+            }
+        }
+
+        public string Read()
+        {
+            try
+            {
+				StringBuilder sb = new StringBuilder();
+				byte[] readBuffer = new byte[1024];
+				while (true)
+				{
+					int bytesRead = _reader.BaseStream.Read(readBuffer, 0, readBuffer.Length);
+					if (bytesRead < 1)
+						break;
+
+					string data = Encoding.ASCII.GetString(readBuffer, 0, bytesRead);
+					sb.Append(data);
+
+					if (data.EndsWith("\r\n>"))
+						break;
+				}
+
+				// 에코 삭제
+				string read = sb.ToString();
+				int rnIdx = read.IndexOf("\r\n");
+
+				return read.Substring(rnIdx + 1);
+			}
+            catch (Exception)
+            {
+                throw;
+            }
+		}
+
+        public string SendCommand(string command)
+        {
+            try
+            {
+				_writer.WriteLine(command);
+
+				return Read();
+			}
+            catch (Exception)
+            {
+                throw;
+            }
+        }
+
+        public void Close()
+        {
+            try
+            {
+                if (_client == null)
+                    return;
+
+				if (_stream != null)
+				{
+					_stream.Flush();
+					_stream.Close();
+				}
+
+				_client.Close();
+				_client.Dispose();
+			}
+            catch (Exception)
+            {
+                throw;
+            }
+        }
+    }
+}

MySolution/ConsoleApp/TelnetSamples/TelnetConsole.cs

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+using Samples.Telnet;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ConsoleApp.TelnetSamples
+{
+	internal class TelnetConsole
+	{
+		private static ITelnetClient _client;
+
+        public TelnetConsole(ITelnetClient client)
+        {
+            _client = client;
+        }
+
+        public void Start(string ip, int port = 23)
+		{
+			try
+			{
+				Console.Write(_client.Connect(ip, port));
+
+				while (true)
+				{
+					string command = Console.ReadLine();
+					if (command == "quit" || command == "exit")
+						break;
+
+					Console.Write(_client.SendCommand(command));
+				}
+			}
+			catch (Exception ex)
+			{
+                Console.WriteLine($"Error: {ex.Message}");
+            }
+			finally
+			{
+				_client.Close();
+			}
+		}
+	}
+}