1 files changed, 330 insertions, 0 deletions
diff --git a/app/src/main/java/org/connectbot/transport/Telnet.java b/app/src/main/java/org/connectbot/transport/Telnet.java
new file mode 100644
index 0000000..5fde2f6
--- /dev/null
+++ b/app/src/main/java/org/connectbot/transport/Telnet.java
@@ -0,0 +1,330 @@
+/*
+ * 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 org.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 org.connectbot.R;
+import org.connectbot.bean.HostBean;
+import org.connectbot.service.TerminalBridge;
+import org.connectbot.service.TerminalManager;
+import org.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 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 org.connectbot.transport.AbsTransport#usesNetwork()
+	 */
+	@Override
+	public boolean usesNetwork() {
+		return true;
+	}
+}