-/**
+/*
* 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.
+ * The MIT License (MIT)
*
- * Copyright (C) 2015 Kevin Lamonte
+ * Copyright (C) 2019 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.
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
*
- * 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.
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
*
- * 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
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
*
* @author Kevin Lamonte [kevin.lamonte@gmail.com]
* @version 1
* establish an 8-bit clean no echo channel and expose window resize events
* to the Jexer ECMA48 backend.
*/
-public final class TelnetSocket extends Socket {
+public class TelnetSocket extends Socket {
- /**
- * The wrapped socket.
- */
- private Socket socket;
+ // ------------------------------------------------------------------------
+ // Constants --------------------------------------------------------------
+ // ------------------------------------------------------------------------
+
+ // Telnet protocol special characters. Note package private access.
+ static final int TELNET_SE = 240;
+ static final int TELNET_NOP = 241;
+ static final int TELNET_DM = 242;
+ static final int TELNET_BRK = 243;
+ static final int TELNET_IP = 244;
+ static final int TELNET_AO = 245;
+ static final int TELNET_AYT = 246;
+ static final int TELNET_EC = 247;
+ static final int TELNET_EL = 248;
+ static final int TELNET_GA = 249;
+ static final int TELNET_SB = 250;
+ static final int TELNET_WILL = 251;
+ static final int TELNET_WONT = 252;
+ static final int TELNET_DO = 253;
+ static final int TELNET_DONT = 254;
+ static final int TELNET_IAC = 255;
+ static final int C_NUL = 0x00;
+ static final int C_LF = 0x0A;
+ static final int C_CR = 0x0D;
+
+ // ------------------------------------------------------------------------
+ // Variables --------------------------------------------------------------
+ // ------------------------------------------------------------------------
/**
* The telnet-aware socket InputStream.
private TelnetInputStream input;
/**
- * The telnet-aware socket OutputStream. Note package private access:
- * input sends stuff to output.
+ * The telnet-aware socket OutputStream.
*/
- TelnetOutputStream output;
+ private 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;
+ /**
+ * If true, this is a server socket (i.e. created by accept()).
+ */
+ boolean isServer = true;
- }
- }
+ /**
+ * If true, telnet ECHO mode is set such that local echo is off and
+ * remote echo is on. This is appropriate for server sockets.
+ */
+ boolean echoMode = false;
/**
- * State of the protocol. Note package private access.
+ * If true, telnet BINARY mode is enabled. We always want this to
+ * ensure a Unicode-safe stream.
*/
- TelnetState nvt;
+ boolean binaryMode = false;
/**
- * See if telnet server/client is in ASCII mode.
- *
- * @return if true, this connection is in ASCII mode
+ * If true, the SUPPRESS-GO-AHEAD option is enabled. We always want
+ * this.
*/
- public boolean isAscii() {
- return (!nvt.binaryMode);
- }
+ boolean goAhead = true;
+
+ /**
+ * If true, request the client terminal type.
+ */
+ boolean doTermType = true;
+
+ /**
+ * If true, request the client terminal speed.
+ */
+ boolean doTermSpeed = true;
+
+ /**
+ * If true, request the Negotiate About Window Size option to
+ * determine the client text width/height.
+ */
+ boolean doNAWS = true;
+
+ /**
+ * If true, request the New Environment option to obtain the client
+ * LOGNAME, USER, and LANG variables.
+ */
+ boolean doEnvironment = true;
+
+ /**
+ * The terminal type reported by the client.
+ */
+ String terminalType = "";
+
+ /**
+ * The terminal speed reported by the client.
+ */
+ String terminalSpeed = "";
+
+ // ------------------------------------------------------------------------
+ // Constructors -----------------------------------------------------------
+ // ------------------------------------------------------------------------
/**
- * Creates a Socket that knows the telnet protocol.
+ * Creates a Socket that knows the telnet protocol. Note package private
+ * access, this is only used by TelnetServerSocket.
*
- * @param socket the underlying Socket
+ * @throws IOException if an I/O error occurs
*/
- TelnetSocket(Socket socket) throws IOException {
+ TelnetSocket() throws IOException {
super();
- nvt = new TelnetState();
- this.socket = socket;
}
- // Socket interface -------------------------------------------------------
+ // ------------------------------------------------------------------------
+ // Socket -----------------------------------------------------------------
+ // ------------------------------------------------------------------------
/**
* Returns an input stream for this socket.
*
* @return the input stream
+ * @throws IOException if an I/O error occurs
*/
@Override
public InputStream getInputStream() throws IOException {
if (input == null) {
- input = new TelnetInputStream(this, super.getInputStream());
+ assert (output == null);
+ output = new TelnetOutputStream(this, super.getOutputStream());
+ input = new TelnetInputStream(this, super.getInputStream(), output);
+ input.telnetSendOptions();
}
return input;
}
* Returns an output stream for this socket.
*
* @return the output stream
+ * @throws IOException if an I/O error occurs
*/
@Override
public OutputStream getOutputStream() throws IOException {
if (output == null) {
+ assert (input == null);
output = new TelnetOutputStream(this, super.getOutputStream());
+ input = new TelnetInputStream(this, super.getInputStream(), output);
+ input.telnetSendOptions();
}
return output;
}
+ // ------------------------------------------------------------------------
+ // TelnetSocket -----------------------------------------------------------
+ // ------------------------------------------------------------------------
+
+ /**
+ * See if telnet server/client is in ASCII mode.
+ *
+ * @return if true, this connection is in ASCII mode
+ */
+ public boolean isAscii() {
+ return (!binaryMode);
+ }
+
}
git://git.nikiroo.be / fanfix.git / blobdiff