--- /dev/null
+/**
+ * Jexer - Java Text User Interface
+ *
+ * License: LGPLv3 or later
+ *
+ * This module is licensed under the GNU Lesser General Public License
+ * Version 3. Please see the file "COPYING" in this directory for more
+ * information about the GNU Lesser General Public License Version 3.
+ *
+ * Copyright (C) 2015 Kevin Lamonte
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see
+ * http://www.gnu.org/licenses/, or write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ * @author Kevin Lamonte [kevin.lamonte@gmail.com]
+ * @version 1
+ */
+package jexer.net;
+
+import java.io.InputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.net.Socket;
+
+/**
+ * This class provides a Socket that performs the telnet protocol to both
+ * establish an 8-bit clean no echo channel and expose window resize events
+ * to the Jexer ECMA48 backend.
+ */
+public final class TelnetSocket extends Socket {
+
+ /**
+ * The wrapped socket.
+ */
+ private Socket socket;
+
+ /**
+ * The telnet-aware socket InputStream.
+ */
+ private TelnetInputStream input;
+
+ /**
+ * The telnet-aware socket OutputStream. Note package private access:
+ * input sends stuff to output.
+ */
+ TelnetOutputStream output;
+
+ // Telnet protocol special characters. Note package private access.
+ public static final int TELNET_SE = 240;
+ public static final int TELNET_NOP = 241;
+ public static final int TELNET_DM = 242;
+ public static final int TELNET_BRK = 243;
+ public static final int TELNET_IP = 244;
+ public static final int TELNET_AO = 245;
+ public static final int TELNET_AYT = 246;
+ public static final int TELNET_EC = 247;
+ public static final int TELNET_EL = 248;
+ public static final int TELNET_GA = 249;
+ public static final int TELNET_SB = 250;
+ public static final int TELNET_WILL = 251;
+ public static final int TELNET_WONT = 252;
+ public static final int TELNET_DO = 253;
+ public static final int TELNET_DONT = 254;
+ public static final int TELNET_IAC = 255;
+ public static final int C_NUL = 0x00;
+ public static final int C_LF = 0x0A;
+ public static final int C_CR = 0x0D;
+
+ /**
+ * Telnet protocol speaks to a Network Virtual Terminal (NVT).
+ */
+ class TelnetState {
+
+ // General status flags outside the NVT spec
+ boolean doInit;
+ boolean isServer;
+
+ // NVT flags
+ boolean echoMode;
+ boolean binaryMode;
+ boolean goAhead;
+ boolean doTermType;
+ boolean doTermSpeed;
+ boolean doNAWS;
+ boolean doEnvironment;
+ String terminal = "";
+
+ // Flags used by the TelnetInputStream
+ boolean iac;
+ boolean dowill;
+ int dowillType;
+ boolean subnegEnd;
+ boolean isEof;
+ boolean eofMsg;
+ boolean readCR;
+
+ // Flags used by the TelnetOutputStream
+ int writeRC;
+ int writeLastErrno;
+ boolean writeLastError;
+ boolean writeCR;
+
+ /**
+ * Constuctor calls reset().
+ */
+ public TelnetState() {
+ reset();
+ }
+
+ /**
+ * Reset NVT to default state as per RFC 854.
+ */
+ public void reset() {
+ echoMode = false;
+ binaryMode = false;
+ goAhead = true;
+ doTermType = true;
+ doTermSpeed = true;
+ doNAWS = true;
+ doEnvironment = true;
+ doInit = true;
+ isServer = true;
+
+ iac = false;
+ dowill = false;
+ subnegEnd = false;
+ isEof = false;
+ eofMsg = false;
+ readCR = false;
+
+ writeRC = 0;
+ writeLastErrno = 0;
+ writeLastError = false;
+ writeCR = false;
+
+ }
+ }
+
+ /**
+ * State of the protocol. Note package private access.
+ */
+ TelnetState nvt;
+
+ /**
+ * See if telnet server/client is in ASCII mode.
+ *
+ * @return if true, this connection is in ASCII mode
+ */
+ public boolean isAscii() {
+ return (!nvt.binaryMode);
+ }
+
+ /**
+ * Creates a Socket that knows the telnet protocol.
+ *
+ * @param socket the underlying Socket
+ */
+ TelnetSocket(Socket socket) throws IOException {
+ super();
+ nvt = new TelnetState();
+ this.socket = socket;
+ }
+
+ // Socket interface -------------------------------------------------------
+
+ /**
+ * Returns an input stream for this socket.
+ *
+ * @return the input stream
+ */
+ @Override
+ public InputStream getInputStream() throws IOException {
+ if (input == null) {
+ input = new TelnetInputStream(this, super.getInputStream());
+ }
+ return input;
+ }
+
+ /**
+ * Returns an output stream for this socket.
+ *
+ * @return the output stream
+ */
+ @Override
+ public OutputStream getOutputStream() throws IOException {
+ if (output == null) {
+ output = new TelnetOutputStream(this, super.getOutputStream());
+ }
+ return output;
+ }
+
+}
git://git.nikiroo.be / fanfix.git / blobdiff