--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/src/main/java/ch/ethz/ssh2/ServerSessionCallback.java	Thu Dec 03 11:23:55 2015 -0800
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2012-2013 Christian Plattner. All rights reserved.
+ * Please refer to the LICENSE.txt for licensing details.
+ */
+
+package ch.ethz.ssh2;
+
+import java.io.IOException;
+
+/**
+ * The interface for an object that receives events based on requests that
+ * a client sends on a session channel. Once the session channel has been set up,
+ * a program is started at the server end. The program can be a shell, an application
+ * program, or a subsystem with a host-independent name. Only one of these requests
+ * can succeed per channel.
+ * <p/>
+ * <b>CAUTION: These event methods are being called from the receiver thread. The receiving of
+ * messages will be blocked until your event handler returns. To signal to the client that you
+ * are willing to accept its request, return a {@link Runnable} object which will be executed
+ * in a new thread <i>after</i> the acknowledgment has been sent back to the client.</b>
+ * <p/>
+ * <b>If a method does not allow you to return a {@link Runnable}, then the
+ * SSH protocol does not allow to send a status back to the client (more exactly, the client cannot
+ * request an acknowledgment). In these cases, if you need to invoke
+ * methods on the {@link ServerSession} or plan to execute long-running activity, then please do this from within a new {@link Thread}.</b>
+ * <p/>
+ * If you want to signal a fatal error, then please throw an <code>IOException</code>. Currently, this will
+ * tear down the whole SSH connection.
+ *
+ * @see ServerSession
+ *
+ * @author Christian
+ *
+ */
+public interface ServerSessionCallback {
+    public Runnable requestPtyReq(ServerSession ss, PtySettings pty) throws IOException;
+
+    public Runnable requestEnv(ServerSession ss, String name, String value) throws IOException;
+
+    public Runnable requestShell(ServerSession ss) throws IOException;
+
+    public Runnable requestExec(ServerSession ss, String command) throws IOException;
+
+    public Runnable requestSubsystem(ServerSession ss, String subsystem) throws IOException;
+
+    /**
+     * When the window (terminal) size changes on the client side, it MAY send a message to the other side to inform it of the new dimensions.
+     *
+     * @param ss the corresponding session
+     * @param term_width_columns
+     * @param term_height_rows
+     * @param term_width_pixels
+     */
+    public void requestWindowChange(ServerSession ss, int term_width_columns, int term_height_rows,
+                                    int term_width_pixels, int term_height_pixels) throws IOException;
+
+    /**
+     * A signal can be delivered to the remote process/service. Some systems may not implement signals, in which case they SHOULD ignore this message.
+     *
+     * @param ss the corresponding session
+     * @param signal (a string without the "SIG" prefix)
+     * @return
+     * @throws IOException
+     */
+
+}