jj.repl.telnet.TelnetSessionStatus.java Source code

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Here is the source code for jj.repl.telnet.TelnetSessionStatus.java

Source

/*
 *    Copyright 2012 Jason Miller
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package jj.repl.telnet;

import static jj.repl.telnet.TelnetProtocol.*;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufProcessor;
import io.netty.buffer.Unpooled;

/**
 * encapsulates the current status of a telnet connection
 * 
 * @author jason
 *
 */
class TelnetSessionStatus {

    TelnetSessionStatus() {
    }

    TelnetSessionStatus parseResponse(final ByteBuf byteBuf) {
        int index = Unpooled.wrappedBuffer(byteBuf).forEachByte(new ByteBufProcessor() {

            @Override
            public boolean process(byte value) throws Exception {
                return nextToken(value);
            }
        });
        System.out.println(index);
        return this;
    }

    private enum State {
        AwaitingIAC, // obv.
        AwaitingMode, // WILL, WONT, DO, DONT, SE, SB, IAC
        AwaitingCommand, // just so
        AwaitingSubcommand, AwaitingSubcommandEnd;
    }

    private State state = State.AwaitingIAC;
    private int mode = 0;

    private boolean nextToken(byte value) {
        switch (state) {
        case AwaitingIAC:
            if (value == (byte) IAC) {
                System.out.println("IAC");
                state = State.AwaitingMode;
            } else {
                // pass the byte through
                System.out.println("got " + value);
            }
            break;

        case AwaitingMode:
            switch (value) {
            case (byte) WILL:
                System.out.println("WILL");
                mode = WILL;
                state = State.AwaitingCommand;
                break;

            case (byte) WONT:
                System.out.println("WONT");
                mode = WONT;
                state = State.AwaitingCommand;
                break;

            case (byte) DO:
                System.out.println("DO");
                mode = DO;
                state = State.AwaitingCommand;
                break;

            case (byte) DONT:
                System.out.println("DONT");
                mode = DONT;
                state = State.AwaitingCommand;
                break;

            case (byte) SE:
            case (byte) SB:

                break;
            case (byte) IAC:
                state = State.AwaitingIAC;
                // pass the 255 through
                break;
            default:
                throw new AssertionError("what");
            }

            break;

        case AwaitingCommand:
            Command command = Command.commandFor(value);
            System.out.println(command);
            switch (mode) {
            case WILL:

                break;

            case WONT:

                break;

            case DO:

                break;

            case DONT:

                break;
            }
            state = State.AwaitingIAC;
            break;

        default:
            throw new AssertionError("fell through!");
        }
        return true;
    }

    //   IAC WILL AUTHENTICATION      -- ff fb 25
    //   IAC DO SUPPRESS-GO-AHEAD     -- ff fd 3
    //   IAC WILL TERMINAL-TYPE       -- ff fb 18
    //   IAC WILL NAWS                -- ff fb 1f
    //   IAC WILL TERMINAL-SPEED      -- ff fb 20
    //   IAC WILL TOGGLE-FLOW-CONTROL -- ff fb 21
    //   IAC WILL LINEMODE            -- ff fb 22
    //   IAC WILL NEW-ENVIRON         -- ff fb 27
    //   IAC DO STATUS                -- ff fd 5
    //   IAC WILL X-DISPLAY-LOCATION  -- ff fb 23

    private boolean linemode = true;

    boolean linemode() {
        return linemode;
    }

    // SLC_SYNCH 3 0

    // SLC_IP 62 3
    // SLC_AO 2 f
    // SLC_AYT 2 14
    // SLC_ABORT 62 1c
    // SLC_EOF 2 4
    // SLC_SUSP 42 1a
    // SLC_EC 2 7f
    // SLC_EL 2 15
    // SLC_EW 2 17
    // SLC_RP 2 12
    // SLC_LNEXT 2 16
    // SLC_XON 2 11
    // SLC_XOFF 2 13
    // SLC_FORW1 0 FF
    // SLC_FORW2 0 FF
}