Update telnet code

downarowiczd · Mar 1, 2022 · 78a746a · 78a746a
1 parent e721c0b
commit 78a746a
Showing 1 changed file with 21 additions and 5 deletions.
diff --git a/src/main/java/at/downardo/j3270Server/Telnet.java b/src/main/java/at/downardo/j3270Server/Telnet.java
@@ -12,6 +12,22 @@
 import java.io.IOException;
 
 public class Telnet {
+
+
+	private static final byte BINARY = (byte)0x00;
+	private static final byte SEND = (byte)0x01;
+	private static final byte SE = (byte)0xf0;
+	private static final byte SB = (byte)0xfa;
+	private static final byte WILL = (byte)0xfb;
+	private static final byte WONT = (byte)0xfc;
+	private static final byte DO = (byte)0xfd;
+	private static final byte DONT = (byte)0xfe;
+	private static final byte IAC = (byte)0xff;
+	private static final byte TERMINALTYPE = (byte)0x18;
+	private static final byte EOR = (byte)0x19;
+
+
+
 	/**
 	 * NegotiateTelnet will naively (e.g. not checking client responses)
 	 * negotiate the options necessary for tn3270 on a new telnet connection
@@ -20,34 +36,34 @@ public class Telnet {
 	 */
 	public static void NegotiateTelnet(BufferedOutputStream out, BufferedInputStream in) {
 		byte[] _trash = new byte[255];
-		byte[] _t = {(byte) 0xff, (byte) 0xfd, 0x18};
+		byte[] _t = {IAC,DO,TERMINALTYPE};
 
 		try {
 			out.write(_t);
 			out.flush();
 			in.read(_trash);
 
-			byte[] _2t = {(byte) 0xff, (byte) 0xfd, 0x18, 0x01, (byte) 0xff, (byte) 0xf0};
+			byte[] _2t = {IAC,SB,TERMINALTYPE,SEND,IAC,SE};
 			out.write(_2t);
 			out.flush();
 
 			in.read(_trash);
 
-			byte[] _3t = {(byte) 0xff, (byte) 0xfd, 0x19};
+			byte[] _3t = {IAC,DO,EOR};
 
 			out.write(_3t);
 			out.flush();
 
 			in.read(_trash);
 
-			byte[] _4t = {(byte) 0xff, (byte) 0xfd, 0x00};
+			byte[] _4t = {IAC,DO,BINARY};
 
 			out.write(_4t);
 			out.flush();
 
 			in.read(_trash);
 
-			byte[] _5t = {(byte) 0xff, (byte) 0xfd, 0x19, (byte) 0xff, (byte) 0xfb, 0x00};
+			byte[] _5t = {IAC,WILL,EOR,IAC,WILL,BINARY};
 
 			out.write(_5t);
 			out.flush();