From: mar-v-in <github@rvin.mooo.com>
Date: Wed, 25 Sep 2013 17:29:53 +0000 (+0200)
Subject: Java/Android stuff (me coding dirty \o/)
X-Git-Url: https://git.ralfj.de/saartuer.git/commitdiff_plain/5bceb6534d5f640dcdd4d5015cecfbad4e82a7b7?ds=inline;hp=a89547dadb2928083b7bd859f99cca9c8c61f74b

Java/Android stuff (me coding dirty \o/)
---

diff --git a/AndTuer/AndroidManifest.xml b/AndTuer/AndroidManifest.xml
new file mode 100644
index 0000000..42c81c6
--- /dev/null
+++ b/AndTuer/AndroidManifest.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          package="de.hacksaar.andtuer">
+    <uses-sdk android:minSdkVersion="7" android:targetSdkVersion="17"/>
+    <uses-permission android:name="android.permission.INTERNET"/>
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
+    <application android:icon="@drawable/icon" android:label="@string/app_name">
+        <activity android:name="de.hacksaar.andtuer.DoorActivity" android:label="@string/app_name">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+        <activity android:name="de.hacksaar.andtuer.DoorSettings" android:label="Settings"/>
+    </application>
+</manifest>
diff --git a/AndTuer/project.properties b/AndTuer/project.properties
new file mode 100644
index 0000000..8ef3988
--- /dev/null
+++ b/AndTuer/project.properties
@@ -0,0 +1,3 @@
+# This file is automatically generated by IntelliJ IDEA
+# Project target.
+target=android-7
diff --git a/AndTuer/res/drawable/icon.png b/AndTuer/res/drawable/icon.png
new file mode 100644
index 0000000..08ee50d
Binary files /dev/null and b/AndTuer/res/drawable/icon.png differ
diff --git a/AndTuer/res/layout/door.xml b/AndTuer/res/layout/door.xml
new file mode 100644
index 0000000..d19b224
--- /dev/null
+++ b/AndTuer/res/layout/door.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent">
+
+    <LinearLayout android:layout_height="wrap_content" android:layout_width="wrap_content"
+                  android:layout_centerInParent="true" android:orientation="vertical">
+        <Button android:layout_height="wrap_content" android:layout_width="wrap_content"
+                android:id="@+id/connect_button"
+                android:text="@string/connect"/>
+        <Button android:layout_height="wrap_content" android:layout_width="wrap_content" android:id="@+id/buzz_button"
+                android:text="@string/buzz" android:enabled="false"/>
+        <Button android:layout_height="wrap_content" android:layout_width="wrap_content" android:id="@+id/open_button"
+                android:text="@string/open_door" android:enabled="false"/>
+        <Button android:layout_height="wrap_content" android:layout_width="wrap_content" android:id="@+id/close_button"
+                android:text="@string/close_door" android:enabled="false"/>
+        <Button android:layout_height="wrap_content" android:layout_width="wrap_content"
+                android:id="@+id/disconnect_button" android:text="@string/disconnect" android:enabled="false"/>
+    </LinearLayout>
+</RelativeLayout>
\ No newline at end of file
diff --git a/AndTuer/res/menu/main.xml b/AndTuer/res/menu/main.xml
new file mode 100644
index 0000000..0717476
--- /dev/null
+++ b/AndTuer/res/menu/main.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<menu xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:id="@+id/menu_settings" android:icon="@android:drawable/ic_menu_preferences"
+          android:title="@string/preferences" android:showAsAction="always"/>
+</menu>
\ No newline at end of file
diff --git a/AndTuer/res/values/strings.xml b/AndTuer/res/values/strings.xml
new file mode 100644
index 0000000..a0e5153
--- /dev/null
+++ b/AndTuer/res/values/strings.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="app_name">Hacksaar AndTuer</string>
+    <string name="connect">Connect</string>
+    <string name="disconnect">Disconnect</string>
+    <string name="buzz">Buzz</string>
+    <string name="open_door">Open door</string>
+    <string name="close_door">Close door</string>
+    <string name="preferences">Preferences</string>
+</resources>
\ No newline at end of file
diff --git a/AndTuer/res/xml/preferences.xml b/AndTuer/res/xml/preferences.xml
new file mode 100644
index 0000000..b2037f2
--- /dev/null
+++ b/AndTuer/res/xml/preferences.xml
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
+    <PreferenceCategory android:title="Server">
+        <EditTextPreference android:key="pref_server_hostname" android:title="Hostname"
+                            android:defaultValue="192.168.178.222"/>
+        <de.hacksaar.andtuer.IntegerTextPreference android:key="pref_server_port" android:title="Port"
+                                                   android:inputType="number" android:defaultValue="22"/>
+    </PreferenceCategory>
+    <PreferenceCategory android:title="User">
+        <EditTextPreference android:key="pref_user_username" android:title="Username"/>
+        <EditTextPreference android:key="pref_user_keyfile" android:title="Keyfile"
+                            android:defaultValue="/sdcard/.ssh/id_rsa"/>
+    </PreferenceCategory>
+</PreferenceScreen>
\ No newline at end of file
diff --git a/AndTuer/src/de/hacksaar/andtuer/AndroidLogging.java b/AndTuer/src/de/hacksaar/andtuer/AndroidLogging.java
new file mode 100644
index 0000000..e4d0b19
--- /dev/null
+++ b/AndTuer/src/de/hacksaar/andtuer/AndroidLogging.java
@@ -0,0 +1,21 @@
+package de.hacksaar.andtuer;
+
+import android.util.Log;
+import de.hacksaar.javatuer.TuerLogging;
+
+public class AndroidLogging extends TuerLogging {
+	@Override
+	public void debug(String tag, String msg) {
+		Log.d(tag, msg);
+	}
+
+	@Override
+	public void exception(String tag, Throwable t) {
+		Log.w(tag, t);
+	}
+
+	@Override
+	public void info(String tag, String msg) {
+		Log.i(tag, msg);
+	}
+}
diff --git a/AndTuer/src/de/hacksaar/andtuer/AsyncTyshell.java b/AndTuer/src/de/hacksaar/andtuer/AsyncTyshell.java
new file mode 100644
index 0000000..4dcdcaf
--- /dev/null
+++ b/AndTuer/src/de/hacksaar/andtuer/AsyncTyshell.java
@@ -0,0 +1,137 @@
+package de.hacksaar.andtuer;
+
+import android.os.AsyncTask;
+import android.util.Log;
+import de.hacksaar.javatuer.InteractiveLogin;
+import de.hacksaar.javatuer.TyshellClient;
+
+import java.util.LinkedList;
+import java.util.Queue;
+
+class AsyncTyshell extends AsyncTask<Void, Void, Void> {
+
+	private static final String TAG = "AsyncTyshell";
+	private final String hostname;
+	private final int port;
+	private final String username;
+	private final String keyFile;
+	private final Prompter prompter;
+	private final Queue<String> messages = new LinkedList<>();
+	private final Object promptWait = new Object();
+	private String promptResultString;
+	private boolean promptResultBoolean;
+	private boolean disconnect = true;
+
+	AsyncTyshell(String hostname, int port, String username, String keyFile, Prompter prompter) {
+		this.hostname = hostname;
+		this.port = port;
+		this.username = username;
+		this.keyFile = keyFile;
+		this.prompter = prompter;
+	}
+
+	private void awaitPrompt() {
+		synchronized (promptWait) {
+			try {
+				promptWait.wait();
+			} catch (InterruptedException e) {
+				Log.w(TAG, e);
+			}
+		}
+	}
+
+	public void disconnect() {
+		disconnect = false;
+		synchronized (promptWait) {
+			promptWait.notify();
+		}
+		synchronized (messages) {
+			messages.notify();
+		}
+	}
+
+	@Override
+	protected Void doInBackground(Void... voids) {
+		TyshellClient client = new TyshellClient(hostname, port, new AndroidLogging());
+		client.connect(username, keyFile, new AsyncInteractiveLogin());
+		while (disconnect) {
+			String msg = null;
+			synchronized (messages) {
+				while (disconnect && (msg = messages.poll()) == null) {
+					try {
+						messages.wait();
+					} catch (InterruptedException e) {
+						return null;
+					}
+				}
+			}
+			if (msg == null) {
+				break;
+			}
+			client.sendCommand(msg);
+		}
+		client.disconnect();
+		return null;
+	}
+
+	public void promptResult(boolean result) {
+		promptResultBoolean = result;
+		synchronized (promptWait) {
+			promptWait.notify();
+		}
+	}
+
+	public void promptResult(String result) {
+		promptResultString = result;
+		synchronized (promptWait) {
+			promptWait.notify();
+		}
+	}
+
+	public void sendCommand(String string) {
+		synchronized (messages) {
+			messages.add(string);
+			messages.notify();
+		}
+	}
+
+	public interface Prompter {
+		void promptBoolean(String message);
+
+		void promptString(String message);
+
+		void sendMessage(String message);
+	}
+
+	private class AsyncInteractiveLogin extends InteractiveLogin {
+
+		AsyncInteractiveLogin() {
+		}
+
+		@Override
+		public String promptKeyPassphrase(String question) {
+			prompter.promptString(question);
+			awaitPrompt();
+			return promptResultString;
+		}
+
+		@Override
+		public String promptUserPassword(String question) {
+			prompter.promptString(question);
+			awaitPrompt();
+			return promptResultString;
+		}
+
+		@Override
+		public boolean promptYesNo(String question) {
+			prompter.promptBoolean(question);
+			awaitPrompt();
+			return promptResultBoolean;
+		}
+
+		@Override
+		public void showMessage(String s) {
+			prompter.sendMessage(s);
+		}
+	}
+}
diff --git a/AndTuer/src/de/hacksaar/andtuer/DoorActivity.java b/AndTuer/src/de/hacksaar/andtuer/DoorActivity.java
new file mode 100644
index 0000000..fc2fc9e
--- /dev/null
+++ b/AndTuer/src/de/hacksaar/andtuer/DoorActivity.java
@@ -0,0 +1,237 @@
+package de.hacksaar.andtuer;
+
+import android.app.Activity;
+import android.app.AlertDialog;
+import android.app.Dialog;
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.content.SharedPreferences;
+import android.os.Bundle;
+import android.preference.PreferenceManager;
+import android.text.InputType;
+import android.util.Log;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.View;
+import android.widget.EditText;
+import android.widget.TextView;
+
+public class DoorActivity extends Activity implements View.OnClickListener {
+
+	private static final String TAG = "DoorActivity";
+	private static final int DIALOG_BOOLEAN = 7;
+	private static final int DIALOG_STRING = 14;
+	private static final int TEXT_ID = 42;
+	private final AsyncTyshell.Prompter prompter = new DialogPrompter();
+	private AsyncTyshell task;
+	private String pendingMessage;
+
+	private Dialog askBooleanDialog() {
+		AlertDialog.Builder builder = new AlertDialog.Builder(this);
+		builder.setTitle(null);
+		builder.setMessage(pendingMessage);
+
+		builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
+			@Override
+			public void onClick(DialogInterface dialog, int whichButton) {
+				assert task != null;
+				task.promptResult(true);
+			}
+		});
+
+		builder.setNegativeButton("No", new DialogInterface.OnClickListener() {
+			@Override
+			public void onClick(DialogInterface dialog, int which) {
+				assert task != null;
+				task.promptResult(false);
+			}
+		});
+
+		return builder.create();
+	}
+
+	private Dialog askStringDialog() {
+		AlertDialog.Builder builder = new AlertDialog.Builder(this);
+		builder.setTitle(null);
+		builder.setMessage(pendingMessage);
+
+		final EditText input = new EditText(this);
+		input.setId(TEXT_ID);
+		input.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);
+		builder.setView(input);
+
+		builder.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
+			@Override
+			public void onClick(DialogInterface dialog, int whichButton) {
+				assert task != null;
+				String value = input.getText().toString();
+				task.promptResult(value);
+			}
+		});
+
+		builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
+			@Override
+			public void onClick(DialogInterface dialog, int whichButton) {
+				assert task != null;
+				task.promptResult(null);
+			}
+		});
+
+		return builder.create();
+	}
+
+	private void onBuzzClick() {
+		if (task != null) {
+			task.sendCommand("buzz");
+		}
+	}
+
+	@Override
+	public void onClick(View view) {
+		switch (view.getId()) {
+			case R.id.connect_button:
+				onConnectClick();
+				break;
+			case R.id.buzz_button:
+				onBuzzClick();
+				break;
+			case R.id.open_button:
+				onOpenClick();
+				break;
+			case R.id.close_button:
+				onCloseClick();
+				break;
+			case R.id.disconnect_button:
+				onDisconnectClick();
+				break;
+		}
+	}
+
+	private void onCloseClick() {
+		if (task != null) {
+			task.sendCommand("close");
+		}
+	}
+
+	private void onConnectClick() {
+		SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
+		task = new AsyncTyshell(preferences.getString(DoorSettings.PREF_SERVER_HOSTNAME, DoorSettings.DEFAULT_HOST),
+								preferences.getInt(DoorSettings.PREF_SERVER_PORT, DoorSettings.DEFAULT_PORT),
+								preferences.getString(DoorSettings.PREF_USER_USERNAME, null),
+								preferences.getString(DoorSettings.PREF_USER_KEYFILE, DoorSettings.DEFAULT_KEYFILE),
+								prompter);
+		task.execute();
+		findViewById(R.id.open_button).setEnabled(true);
+		findViewById(R.id.close_button).setEnabled(true);
+		findViewById(R.id.buzz_button).setEnabled(true);
+		findViewById(R.id.disconnect_button).setEnabled(true);
+	}
+
+	@Override
+	public void onCreate(Bundle savedInstanceState) {
+		super.onCreate(savedInstanceState);
+		setContentView(R.layout.door);
+		findViewById(R.id.open_button).setOnClickListener(this);
+		findViewById(R.id.close_button).setOnClickListener(this);
+		findViewById(R.id.buzz_button).setOnClickListener(this);
+		findViewById(R.id.disconnect_button).setOnClickListener(this);
+		findViewById(R.id.connect_button).setOnClickListener(this);
+	}
+
+	@Override
+	protected Dialog onCreateDialog(int id) {
+		switch (id) {
+			case DIALOG_BOOLEAN:
+				return askBooleanDialog();
+			case DIALOG_STRING:
+				return askStringDialog();
+			default:
+				return super.onCreateDialog(id);
+		}
+	}
+
+	@Override
+	public boolean onCreateOptionsMenu(Menu menu) {
+		getMenuInflater().inflate(R.menu.main, menu);
+		return super.onCreateOptionsMenu(menu);
+	}
+
+	private void onDisconnectClick() {
+		if (task != null) {
+			task.sendCommand("exit");
+			task.disconnect();
+		}
+		findViewById(R.id.open_button).setEnabled(false);
+		findViewById(R.id.close_button).setEnabled(false);
+		findViewById(R.id.buzz_button).setEnabled(false);
+		findViewById(R.id.disconnect_button).setEnabled(false);
+	}
+
+	@Override
+	public boolean onMenuItemSelected(int featureId, MenuItem item) {
+		switch (item.getItemId()) {
+			case R.id.menu_settings:
+				startActivity(new Intent(this, DoorSettings.class));
+				return true;
+			default:
+				return super.onMenuItemSelected(featureId, item);
+		}
+	}
+
+	private void onOpenClick() {
+		if (task != null) {
+			task.sendCommand("open");
+		}
+	}
+
+	@Override
+	protected void onPrepareDialog(int id, Dialog dialog) {
+		switch (id) {
+			case DIALOG_STRING:
+				((TextView) dialog.findViewById(TEXT_ID)).setText("");
+			case DIALOG_BOOLEAN:
+				((AlertDialog) dialog).setMessage(pendingMessage);
+				break;
+			default:
+				super.onPrepareDialog(id, dialog);
+		}
+
+	}
+
+	private class DialogPrompter implements AsyncTyshell.Prompter {
+		DialogPrompter() {
+		}
+
+		@Override
+		public void promptBoolean(String message) {
+			pendingMessage = message;
+			runOnUiThread(new Runnable() {
+				@Override
+				public void run() {
+					showDialog(DIALOG_BOOLEAN);
+				}
+			});
+		}
+
+		@Override
+		public void promptString(String message) {
+			pendingMessage = message;
+			runOnUiThread(new Runnable() {
+				@Override
+				public void run() {
+					showDialog(DIALOG_STRING);
+				}
+			});
+		}
+
+		@Override
+		public void sendMessage(final String message) {
+			runOnUiThread(new Runnable() {
+				@Override
+				public void run() {
+					Log.d(TAG, "Message: " + message);
+				}
+			});
+		}
+	}
+}
\ No newline at end of file
diff --git a/AndTuer/src/de/hacksaar/andtuer/DoorSettings.java b/AndTuer/src/de/hacksaar/andtuer/DoorSettings.java
new file mode 100644
index 0000000..1fd0d7a
--- /dev/null
+++ b/AndTuer/src/de/hacksaar/andtuer/DoorSettings.java
@@ -0,0 +1,49 @@
+package de.hacksaar.andtuer;
+
+import android.content.SharedPreferences;
+import android.os.Bundle;
+import android.os.Environment;
+import android.preference.Preference;
+import android.preference.PreferenceActivity;
+
+public class DoorSettings extends PreferenceActivity implements Preference.OnPreferenceChangeListener {
+	public static final int DEFAULT_PORT = 22;
+	public static final String DEFAULT_HOST = "192.168.178.222";
+	public static final String DEFAULT_KEYFILE = Environment.getExternalStorageDirectory().getPath() + "/.ssh/id_rsa";
+	private static final String UNSET = "<unset>";
+	public static final String PREF_SERVER_PORT = "pref_server_port";
+	public static final String PREF_USER_USERNAME = "pref_user_username";
+	public static final String PREF_USER_KEYFILE = "pref_user_keyfile";
+	public static final String PREF_SERVER_HOSTNAME = "pref_server_hostname";
+
+	@Override
+	public void onCreate(Bundle savedInstanceState) {
+		super.onCreate(savedInstanceState);
+		addPreferencesFromResource(R.xml.preferences);
+		Preference hostnamePreference = findPreference(PREF_SERVER_HOSTNAME);
+		hostnamePreference.setOnPreferenceChangeListener(this);
+		SharedPreferences sharedPreferences = getPreferenceManager().getSharedPreferences();
+		hostnamePreference.setSummary(sharedPreferences.getString(PREF_SERVER_HOSTNAME, DEFAULT_HOST));
+		Preference portPreference = findPreference(PREF_SERVER_PORT);
+		portPreference.setOnPreferenceChangeListener(this);
+		portPreference.setSummary(Integer.toString(sharedPreferences.getInt(PREF_SERVER_PORT, DEFAULT_PORT)));
+		Preference usernamePreference = findPreference(PREF_USER_USERNAME);
+		usernamePreference.setOnPreferenceChangeListener(this);
+		usernamePreference.setSummary(sharedPreferences.getString(PREF_USER_USERNAME, UNSET));
+		Preference keyfilePreference = findPreference(PREF_USER_KEYFILE);
+		keyfilePreference.setOnPreferenceChangeListener(this);
+		keyfilePreference.setSummary(sharedPreferences.getString(PREF_USER_KEYFILE, DEFAULT_KEYFILE));
+	}
+
+	@Override
+	public boolean onPreferenceChange(Preference preference, Object o) {
+		SharedPreferences sharedPreferences = getPreferenceManager().getSharedPreferences();
+		if (preference.getKey().equals(PREF_SERVER_PORT)) {
+			preference.setSummary(
+					Integer.toString(sharedPreferences.getInt(preference.getKey(), DEFAULT_PORT)));
+		} else {
+			preference.setSummary(sharedPreferences.getString(preference.getKey(), UNSET));
+		}
+		return true;
+	}
+}
\ No newline at end of file
diff --git a/AndTuer/src/de/hacksaar/andtuer/IntegerTextPreference.java b/AndTuer/src/de/hacksaar/andtuer/IntegerTextPreference.java
new file mode 100644
index 0000000..69b750c
--- /dev/null
+++ b/AndTuer/src/de/hacksaar/andtuer/IntegerTextPreference.java
@@ -0,0 +1,29 @@
+package de.hacksaar.andtuer;
+
+import android.content.Context;
+import android.preference.EditTextPreference;
+import android.util.AttributeSet;
+
+public class IntegerTextPreference extends EditTextPreference {
+	public IntegerTextPreference(Context context, AttributeSet attrs, int defStyle) {
+		super(context, attrs, defStyle);
+	}
+
+	public IntegerTextPreference(Context context, AttributeSet attrs) {
+		super(context, attrs);
+	}
+
+	public IntegerTextPreference(Context context) {
+		super(context);
+	}
+
+	@Override
+	protected String getPersistedString(String defaultReturnValue) {
+		return String.valueOf(getPersistedInt(-1));
+	}
+
+	@Override
+	protected boolean persistString(String value) {
+		return persistInt(Integer.valueOf(value));
+	}
+}
diff --git a/JavaTuer/src/de/hacksaar/javatuer/DummyLogging.java b/JavaTuer/src/de/hacksaar/javatuer/DummyLogging.java
new file mode 100644
index 0000000..ab37f5b
--- /dev/null
+++ b/JavaTuer/src/de/hacksaar/javatuer/DummyLogging.java
@@ -0,0 +1,18 @@
+package de.hacksaar.javatuer;
+
+public class DummyLogging extends TuerLogging {
+	@Override
+	public void debug(String tag, String msg) {
+		// do nothing
+	}
+
+	@Override
+	public void exception(String tag, Throwable t) {
+		// do nothing
+	}
+
+	@Override
+	public void info(String tag, String msg) {
+		// do nothing
+	}
+}
diff --git a/JavaTuer/src/de/hacksaar/javatuer/InteractiveLogin.java b/JavaTuer/src/de/hacksaar/javatuer/InteractiveLogin.java
new file mode 100644
index 0000000..29c0c38
--- /dev/null
+++ b/JavaTuer/src/de/hacksaar/javatuer/InteractiveLogin.java
@@ -0,0 +1,34 @@
+package de.hacksaar.javatuer;
+
+import com.jcraft.jsch.UserInfo;
+
+public abstract class InteractiveLogin implements UserInfo {
+	private String password;
+	private String passphrase;
+
+	@Override
+	public String getPassphrase() {
+		return passphrase;
+	}
+
+	@Override
+	public String getPassword() {
+		return password;
+	}
+
+	public abstract String promptKeyPassphrase(String question);
+
+	@Override
+	public boolean promptPassphrase(String s) {
+		passphrase = promptKeyPassphrase(s);
+		return passphrase != null;
+	}
+
+	@Override
+	public boolean promptPassword(String s) {
+		password = promptUserPassword(s);
+		return password != null;
+	}
+
+	public abstract String promptUserPassword(String question);
+}
diff --git a/JavaTuer/src/de/hacksaar/javatuer/SshClient.java b/JavaTuer/src/de/hacksaar/javatuer/SshClient.java
new file mode 100644
index 0000000..7e63d31
--- /dev/null
+++ b/JavaTuer/src/de/hacksaar/javatuer/SshClient.java
@@ -0,0 +1,158 @@
+package de.hacksaar.javatuer;
+
+import com.jcraft.jsch.*;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+public class SshClient {
+	private static final String TAG = "SshClient";
+	private final String host;
+	private final String username;
+	private final int port;
+	private final JSch jSch;
+	private final TuerLogging log;
+	private Session session;
+	private Channel channel;
+
+	public SshClient(String host, String username, int port, TuerLogging log) {
+		this.host = host;
+		this.username = username;
+		this.port = port;
+		this.log = log;
+		JSch.setLogger(log);
+		jSch = new JSch();
+	}
+
+	public void addPrivateKey(String keyFilePath) throws JSchException {
+		jSch.addIdentity(keyFilePath);
+	}
+
+	public void addPrivateKey(String keyFilePath, String passphrase) throws JSchException {
+		jSch.addIdentity(keyFilePath, passphrase);
+	}
+
+	public void disconnect() {
+		channel.disconnect();
+		channel = null;
+		session.disconnect();
+		session = null;
+	}
+
+	public String getHost() {
+		return host;
+	}
+
+	public InputStream getInputStream() throws IOException {
+		if (channel == null) {
+			return null;
+		}
+		return channel.getInputStream();
+	}
+
+	public OutputStream getOutputStream() throws IOException {
+		if (channel == null) {
+			return null;
+		}
+		return channel.getOutputStream();
+	}
+
+	public int getPort() {
+		return port;
+	}
+
+	public String getUsername() {
+		return username;
+	}
+
+	public boolean isConnected() {
+		return channel != null && channel.isConnected() && session != null && session.isConnected();
+	}
+
+	public void login(final String password) throws JSchException {
+		login(new UserInfo() {
+
+			@Override
+			public String getPassphrase() {
+				return null;
+			}
+
+			@Override
+			public String getPassword() {
+				return password;
+			}
+
+			@Override
+			public boolean promptPassphrase(String s) {
+				return false;
+			}
+
+			@Override
+			public boolean promptPassword(String s) {
+				return true;
+			}
+
+			@Override
+			public boolean promptYesNo(String s) {
+				return false;
+			}
+
+			@Override
+			public void showMessage(String s) {
+				log.info(TAG, s);
+			}
+		});
+	}
+
+	public void login() throws JSchException {
+		login(new UserInfo() {
+
+			@Override
+			public String getPassphrase() {
+				return null;
+			}
+
+			@Override
+			public String getPassword() {
+				return null;
+			}
+
+			@Override
+			public boolean promptPassphrase(String s) {
+				return false;
+			}
+
+			@Override
+			public boolean promptPassword(String s) {
+				return false;
+			}
+
+			@Override
+			public boolean promptYesNo(String s) {
+				return false;
+			}
+
+			@Override
+			public void showMessage(String s) {
+				log.info(TAG, s);
+			}
+		});
+	}
+
+	public void login(UserInfo userInfo) throws JSchException {
+		log.debug(TAG, "Creating session");
+		if (session == null) {
+			session = jSch.getSession(username, host, port);
+		}
+		if (!session.isConnected()) {
+			session.setUserInfo(userInfo);
+			log.debug(TAG, "Connecting");
+			session.connect();
+			log.debug(TAG, "Opening channel");
+			channel = session.openChannel("shell");
+			channel.connect();
+		}
+	}
+
+}
diff --git a/JavaTuer/src/de/hacksaar/javatuer/StderrLogging.java b/JavaTuer/src/de/hacksaar/javatuer/StderrLogging.java
new file mode 100644
index 0000000..326f37d
--- /dev/null
+++ b/JavaTuer/src/de/hacksaar/javatuer/StderrLogging.java
@@ -0,0 +1,20 @@
+package de.hacksaar.javatuer;
+
+public class StderrLogging extends TuerLogging {
+
+	@Override
+	public void debug(String tag, String msg) {
+		System.err.println("D/" + tag + ": " + msg);
+	}
+
+	@Override
+	public void exception(String tag, Throwable t) {
+		System.err.println("E/" + tag + ": " + t.getMessage());
+		t.printStackTrace(System.err);
+	}
+
+	@Override
+	public void info(String tag, String msg) {
+		System.err.println("I/" + tag + ": " + msg);
+	}
+}
diff --git a/JavaTuer/src/de/hacksaar/javatuer/TuerLogging.java b/JavaTuer/src/de/hacksaar/javatuer/TuerLogging.java
new file mode 100644
index 0000000..6dbc199
--- /dev/null
+++ b/JavaTuer/src/de/hacksaar/javatuer/TuerLogging.java
@@ -0,0 +1,24 @@
+package de.hacksaar.javatuer;
+
+import com.jcraft.jsch.Logger;
+
+public abstract class TuerLogging implements Logger {
+
+	public abstract void debug(String tag, String msg);
+
+	public abstract void exception(String tag, Throwable t);
+
+	public abstract void info(String tag, String msg);
+
+	@Override
+	public boolean isEnabled(int i) {
+		return true;
+	}
+
+	@Override
+	public void log(int i, String s) {
+		if (i == 1) {
+			info("SshConnection", s);
+		}
+	}
+}
diff --git a/JavaTuer/src/de/hacksaar/javatuer/TyshellClient.java b/JavaTuer/src/de/hacksaar/javatuer/TyshellClient.java
new file mode 100644
index 0000000..73d637d
--- /dev/null
+++ b/JavaTuer/src/de/hacksaar/javatuer/TyshellClient.java
@@ -0,0 +1,91 @@
+package de.hacksaar.javatuer;
+
+import com.jcraft.jsch.JSchException;
+import com.jcraft.jsch.UserInfo;
+
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+
+public class TyshellClient {
+	private static final String TAG = "TyshellClient";
+	public static final char END_OF_COMMAND = '\n';
+	private final String hostname;
+	private final int port;
+	private final TuerLogging log;
+	private SshClient client;
+	private InputStreamReader inputStream;
+	private OutputStreamWriter outputStream;
+
+	public TyshellClient(String hostname, int port) {
+		this(hostname, port, new DummyLogging());
+	}
+
+	public TyshellClient(String hostname, int port, TuerLogging log) {
+		this.log = log;
+		this.hostname = hostname;
+		this.port = port;
+	}
+
+	public void connect(String username, String password) {
+		try {
+			client = new SshClient(hostname, username, port, log);
+			client.login(password);
+			inputStream = new InputStreamReader(client.getInputStream());
+			outputStream = new OutputStreamWriter(client.getOutputStream());
+		} catch (JSchException | IOException e) {
+			log.exception(TAG, e);
+		}
+	}
+
+	public void connect(String username, String keyFile, String passphrase) {
+		try {
+			client = new SshClient(hostname, username, port, log);
+			client.addPrivateKey(keyFile, passphrase);
+			client.login();
+			inputStream = new InputStreamReader(client.getInputStream());
+			outputStream = new OutputStreamWriter(client.getOutputStream());
+		} catch (JSchException | IOException e) {
+			log.exception(TAG, e);
+		}
+	}
+
+	public void connect(String username, String keyFile, UserInfo interactiveLogin) {
+		try {
+			client = new SshClient(hostname, username, port, log);
+			client.addPrivateKey(keyFile);
+			client.login(interactiveLogin);
+			inputStream = new InputStreamReader(client.getInputStream());
+			outputStream = new OutputStreamWriter(client.getOutputStream());
+		} catch (JSchException | IOException e) {
+			log.exception(TAG, e);
+		}
+	}
+
+	public void disconnect() {
+		try {
+			inputStream.close();
+			outputStream.close();
+		} catch (IOException e) {
+			log.exception(TAG, e);
+		}
+		client.disconnect();
+	}
+
+	boolean isConnected() {
+		return (client.isConnected() && inputStream != null && outputStream != null);
+	}
+
+	public void sendCommand(String command) {
+		if (isConnected()) {
+			try {
+				assert outputStream != null;
+				log.debug(TAG, "Sending: " + command);
+				outputStream.write((command + END_OF_COMMAND).toCharArray());
+				outputStream.flush();
+			} catch (IOException e) {
+				log.exception(TAG, e);
+			}
+		}
+	}
+}