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annotate app/src/main/java/ch/ethz/ssh2/ServerSessionCallback.java @ 491:c89833b1614b

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Added tag stable-1.9.4-2 for changeset 7545103ec815
author Carl Byington <carl@five-ten-sg.com>
date Wed, 14 Oct 2020 14:52:39 -0700
parents d29cce60f393
children
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1 /*
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2 * Copyright (c) 2012-2013 Christian Plattner. All rights reserved.
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3 * Please refer to the LICENSE.txt for licensing details.
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4 */
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5
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6 package ch.ethz.ssh2;
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7
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8 import java.io.IOException;
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9
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10 /**
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11 * The interface for an object that receives events based on requests that
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12 * a client sends on a session channel. Once the session channel has been set up,
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13 * a program is started at the server end. The program can be a shell, an application
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14 * program, or a subsystem with a host-independent name. Only one of these requests
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15 * can succeed per channel.
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16 * <p/>
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17 * <b>CAUTION: These event methods are being called from the receiver thread. The receiving of
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18 * messages will be blocked until your event handler returns. To signal to the client that you
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19 * are willing to accept its request, return a {@link Runnable} object which will be executed
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20 * in a new thread <i>after</i> the acknowledgment has been sent back to the client.</b>
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21 * <p/>
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22 * <b>If a method does not allow you to return a {@link Runnable}, then the
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23 * SSH protocol does not allow to send a status back to the client (more exactly, the client cannot
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24 * request an acknowledgment). In these cases, if you need to invoke
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25 * methods on the {@link ServerSession} or plan to execute long-running activity, then please do this from within a new {@link Thread}.</b>
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26 * <p/>
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27 * If you want to signal a fatal error, then please throw an <code>IOException</code>. Currently, this will
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28 * tear down the whole SSH connection.
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29 *
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30 * @see ServerSession
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31 *
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32 * @author Christian
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33 *
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34 */
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35 public interface ServerSessionCallback {
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36 public Runnable requestPtyReq(ServerSession ss, PtySettings pty) throws IOException;
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38 public Runnable requestEnv(ServerSession ss, String name, String value) throws IOException;
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40 public Runnable requestShell(ServerSession ss) throws IOException;
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41
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42 public Runnable requestExec(ServerSession ss, String command) throws IOException;
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44 public Runnable requestSubsystem(ServerSession ss, String subsystem) throws IOException;
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45
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46 /**
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47 * 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.
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48 *
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49 * @param ss the corresponding session
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50 * @param term_width_columns
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51 * @param term_height_rows
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52 * @param term_width_pixels
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53 */
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54 public void requestWindowChange(ServerSession ss, int term_width_columns, int term_height_rows,
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55 int term_width_pixels, int term_height_pixels) throws IOException;
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57 /**
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58 * A signal can be delivered to the remote process/service. Some systems may not implement signals, in which case they SHOULD ignore this message.
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59 *
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60 * @param ss the corresponding session
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61 * @param signal (a string without the "SIG" prefix)
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62 * @return
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63 * @throws IOException
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64 */
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66 }