--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/com/five_ten_sg/connectbot/transport/Telnet.java	Thu May 22 10:41:19 2014 -0700
@@ -0,0 +1,352 @@
+/*
+ * ConnectBot: simple, powerful, open-source SSH client for Android
+ * Copyright 2007 Kenny Root, Jeffrey Sharkey
+ *
+ * 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 com.five_ten_sg.connectbot.transport;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.Socket;
+import java.net.SocketException;
+import java.net.UnknownHostException;
+import java.nio.charset.Charset;
+import java.util.Map;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import com.five_ten_sg.connectbot.R;
+import com.five_ten_sg.connectbot.bean.HostBean;
+import com.five_ten_sg.connectbot.service.TerminalBridge;
+import com.five_ten_sg.connectbot.service.TerminalManager;
+import com.five_ten_sg.connectbot.util.HostDatabase;
+import android.content.Context;
+import android.net.Uri;
+import android.util.Log;
+import de.mud.telnet.TelnetProtocolHandler;
+
+/**
+ * Telnet transport implementation.<br/>
+ * Original idea from the JTA telnet package (de.mud.telnet)
+ *
+ * @author Kenny Root
+ *
+ */
+public class Telnet extends AbsTransport {
+    private static final String TAG = "ConnectBot.Telnet";
+    private static final String PROTOCOL = "telnet";
+
+    private static final int DEFAULT_PORT = 23;
+
+    private TelnetProtocolHandler handler;
+    private Socket socket;
+
+    private InputStream is;
+    private OutputStream os;
+    private int width;
+    private int height;
+
+    private boolean connected = false;
+
+    static final Pattern hostmask;
+    static {
+        hostmask = Pattern.compile("^([0-9a-z.-]+)(:(\\d+))?$", Pattern.CASE_INSENSITIVE);
+    }
+
+    public Telnet() {
+        handler = new TelnetProtocolHandler() {
+            /** get the current terminal type */
+            @Override
+            public String getTerminalType() {
+                return getEmulation();
+            }
+            /** get the current window size */
+            @Override
+            public int[] getWindowSize() {
+                return new int[] { width, height };
+            }
+            /** notify about local echo */
+            @Override
+            public void setLocalEcho(boolean echo) {
+                /* EMPTY */
+            }
+            /** write data to our back end */
+            @Override
+            public void write(byte[] b) throws IOException {
+                if (os != null)
+                    os.write(b);
+            }
+            /** sent on IAC EOR (prompt terminator for remote access systems). */
+            @Override
+            public void notifyEndOfRecord() {
+            }
+            @Override
+            protected String getCharsetName() {
+                Charset charset = bridge.getCharset();
+
+                if (charset != null)
+                    return charset.name();
+                else
+                    return "";
+            }
+        };
+    }
+
+    /**
+     * @param host
+     * @param bridge
+     * @param manager
+     */
+    public Telnet(HostBean host, TerminalBridge bridge, TerminalManager manager) {
+        super(host, bridge, manager);
+    }
+
+    public static String getProtocolName() {
+        return PROTOCOL;
+    }
+
+    @Override
+    public void connect() {
+        try {
+            socket = new Socket(host.getHostname(), host.getPort());
+            connected = true;
+            is = socket.getInputStream();
+            os = socket.getOutputStream();
+            bridge.onConnected();
+        }
+        catch (UnknownHostException e) {
+            Log.d(TAG, "IO Exception connecting to host", e);
+        }
+        catch (IOException e) {
+            Log.d(TAG, "IO Exception connecting to host", e);
+        }
+    }
+
+    @Override
+    public void close() {
+        connected = false;
+
+        if (socket != null)
+            try {
+                socket.close();
+                socket = null;
+            }
+            catch (IOException e) {
+                Log.d(TAG, "Error closing telnet socket.", e);
+            }
+    }
+
+    @Override
+    public void flush() throws IOException {
+        os.flush();
+    }
+
+    @Override
+    public int getDefaultPort() {
+        return DEFAULT_PORT;
+    }
+
+    @Override
+    public boolean isConnected() {
+        return connected;
+    }
+
+    @Override
+    public boolean isSessionOpen() {
+        return connected;
+    }
+
+    @Override
+    public boolean isAuthenticated() {
+        return isConnected();
+    }
+
+    @Override
+    public boolean willBlock() {
+        if (is == null) return true;
+        try {
+            return is.available() == 0;
+        } catch (Exception e) {
+            return true;
+        }
+    }
+
+    @Override
+    public int read(byte[] buffer, int start, int len) throws IOException {
+        /* process all already read bytes */
+        int n = 0;
+
+        do {
+            n = handler.negotiate(buffer, start);
+
+            if (n > 0)
+                return n;
+        }
+        while (n == 0);
+
+        while (n <= 0) {
+            do {
+                n = handler.negotiate(buffer, start);
+
+                if (n > 0)
+                    return n;
+            }
+            while (n == 0);
+
+            n = is.read(buffer, start, len);
+
+            if (n < 0) {
+                bridge.dispatchDisconnect(false);
+                throw new IOException("Remote end closed connection.");
+            }
+
+            handler.inputfeed(buffer, start, n);
+            n = handler.negotiate(buffer, start);
+        }
+
+        return n;
+    }
+
+    @Override
+    public void write(byte[] buffer) throws IOException {
+        try {
+            if (os != null)
+                os.write(buffer);
+        }
+        catch (SocketException e) {
+            bridge.dispatchDisconnect(false);
+        }
+    }
+
+    @Override
+    public void write(int c) throws IOException {
+        try {
+            if (os != null)
+                os.write(c);
+        }
+        catch (SocketException e) {
+            bridge.dispatchDisconnect(false);
+        }
+    }
+
+    @Override
+    public void setDimensions(int columns, int rows, int width, int height) {
+        try {
+            handler.setWindowSize(columns, rows);
+        }
+        catch (IOException e) {
+            Log.e(TAG, "Couldn't resize remote terminal", e);
+        }
+    }
+
+    @Override
+    public String getDefaultNickname(String username, String hostname, int port) {
+        if (port == DEFAULT_PORT) {
+            return String.format("%s", hostname);
+        }
+        else {
+            return String.format("%s:%d", hostname, port);
+        }
+    }
+
+    public static Uri getUri(String input) {
+        Matcher matcher = hostmask.matcher(input);
+
+        if (!matcher.matches())
+            return null;
+
+        StringBuilder sb = new StringBuilder();
+        sb.append(PROTOCOL)
+        .append("://")
+        .append(matcher.group(1));
+        String portString = matcher.group(3);
+        int port = DEFAULT_PORT;
+
+        if (portString != null) {
+            try {
+                port = Integer.parseInt(portString);
+
+                if (port < 1 || port > 65535) {
+                    port = DEFAULT_PORT;
+                }
+            }
+            catch (NumberFormatException nfe) {
+                // Keep the default port
+            }
+        }
+
+        if (port != DEFAULT_PORT) {
+            sb.append(':');
+            sb.append(port);
+        }
+
+        sb.append("/#")
+        .append(Uri.encode(input));
+        Uri uri = Uri.parse(sb.toString());
+        return uri;
+    }
+
+    @Override
+    public HostBean createHost(Uri uri) {
+        HostBean host = new HostBean();
+        host.setProtocol(PROTOCOL);
+        host.setHostname(uri.getHost());
+        int port = uri.getPort();
+
+        if (port < 0)
+            port = DEFAULT_PORT;
+
+        host.setPort(port);
+        String nickname = uri.getFragment();
+
+        if (nickname == null || nickname.length() == 0) {
+            host.setNickname(getDefaultNickname(host.getUsername(),
+                                                host.getHostname(), host.getPort()));
+        }
+        else {
+            host.setNickname(uri.getFragment());
+        }
+
+        return host;
+    }
+
+    @Override
+    public void getSelectionArgs(Uri uri, Map<String, String> selection) {
+        selection.put(HostDatabase.FIELD_HOST_PROTOCOL, PROTOCOL);
+        selection.put(HostDatabase.FIELD_HOST_NICKNAME, uri.getFragment());
+        selection.put(HostDatabase.FIELD_HOST_HOSTNAME, uri.getHost());
+        int port = uri.getPort();
+
+        if (port < 0)
+            port = DEFAULT_PORT;
+
+        selection.put(HostDatabase.FIELD_HOST_PORT, Integer.toString(port));
+    }
+
+    public static String getFormatHint(Context context) {
+        return String.format("%s:%s",
+                             context.getString(R.string.format_hostname),
+                             context.getString(R.string.format_port));
+    }
+
+    /* (non-Javadoc)
+     * @see com.five_ten_sg.connectbot.transport.AbsTransport#usesNetwork()
+     */
+    @Override
+    public boolean usesNetwork() {
+        return true;
+    }
+}