Converting string into inputstream and outputstream Jsch (ssh connection)

[Greed]

Hi,
I want to transform string commands into Inputstream, then send it to server using Jsch and see the result.

The Jsch/examples/shell allows us to load .profile that's a good thing(so don't try to offer exec which doesn't load shell commands in a file automatically! unless u can make that work...), but I want to create a program which interacts on button click not on endless entering of commands to javaSwingputty app... so i need to transform this(standart Jsch shell example) :

import com.jcraft.jsch.*;
import java.awt.*;
import javax.swing.*;
public class Shell{
    public static void main(String[] arg) throws JSchException{
    try{

      JSch jsch=new JSch();
      String host=null;
      String user="user1";
      host="server1.co.uk";
      String pasww="12345";
      Session session=jsch.getSession(user, host, 22);
      session.setPassword(pasww);
      session.setConfig("StrictHostKeyChecking", "no");
      session.connect();  
      Channel channel=session.openChannel("shell");

      channel.setInputStream(System.in);//read stuff from keyboard(newgrp,lrp_list...)
      channel.setOutputStream(System.out);//outprintln stuff
      channel.connect();
    }
    catch(Exception e){
      System.out.println(e);
    }
  }

Into something where instead or reading commands from System.in(keyboard) to something like having a string String commands="ls;date;newgrp;lrp_list";
and then send these commands to server and see the servers response just like in putty. This is what I have so far:

import java.util.logging.Level;
import java.util.logging.Logger;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelShell;
import com.jcraft.jsch.Session;
import java.io.ByteArrayInputStream;

public class ShellMultipleCommandsAfterLoadingDotprofile  {
      public static void main(String[] arg) throws JSchException{
     [COLOR="Green"] String   commandToRun=  "cat > furryanimal.txt;lrp_list;newgrp server1;date";//executing remote scripts
      InputStream in = null;
      OutputStream out =null;
      byte[] bytes = commandToRun.getBytes();
      ByteArrayInputStream bais=new ByteArrayInputStream(bytes); [/COLOR]
        try {//connection
        JSch jsch = new JSch();
        String user="user1";
        host="server1.co.uk";
        String pasww="12345";
        Session session = null;

        session = jsch.getSession(user, host, 22);
     
        session.setPassword(pasww);
        session.setConfig("StrictHostKeyChecking", "no");
        session.connect();

        Channel channel = session.openChannel("shell");

//here the fun begins 
       
[COLOR="Green"]        ((ChannelShell) channel).setInputStream(bais); //what does this thing do?

        in = channel.getInputStream();
        channel.connect();//connected throug shell :) loaded .profile hopefully!?
  

    channel.setInputStream(in);// at this point I know that shell has loded .profile because I see the output,
                                // but what about my commands(lrp_list;newgrp...)? were they excecuted?
    channel.setOutputStream(System.out);//here's the output of .profile!

    byte[] tmp = new byte[1024];
                while (true) {// what does this do? excecute commands?
                    while (in.available() > 0) {
                        int i = in.read(tmp, 0, 1024);
                        if (i < 0) {
                            break;
                        }
                    }
                    if (channel.isClosed()) {
                        break;
                    }
                    try {
                        Thread.sleep(1000);//some scripts might take up to 20 minutes to complete ???
                    } catch (Exception ee) {
                    }
            // System.out.println("After reading smtng! inputstream> "+in); loop...
            //System.out.println(result after each command, to see if we have succeded 1)to load .profile 
       //and see the list of its commands, yes we have 
      //2) to see the result of each command ls;newgrp;date... I think no);[/COLOR]
                }
          
            } catch (IOException ex) {
                Logger.getLogger(ShellMultipleCommandsAfterLoadingDotprofile.class.getName()).log(Level.SEVERE, null, ex);
            } catch (JSchException ex) {
                Logger.getLogger(ShellMultipleCommandsAfterLoadingDotprofile.class.getName()).log(Level.SEVERE, null, ex);
            } finally {
                try {
                    in.close();
                } catch (IOException ex) {
                    Logger.getLogger(ShellMultipleCommandsAfterLoadingDotprofile.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
}}

[JosAH]

Have a look at the ByteArrayInputStream and ByteArrayOutputStream classes. the String.getBytes() method delivers the byte array for your output stream and one of String's constructor can convert a byte array to a String again.

kind regards,

Jos

[Greed]

The point is that this program doesn't excecute commands!!!
so my string command is ("furry.txt;lrp_list;newgrp server1;date");
now how transformation goes from string to InputStream;
Because I believe the command is being send to server using command:channel.setInputStream(in);// ...setInputStream(InputStream in); there is no documentation about this...
But for some divine reason no commands go to the server because file furry.txt is not created :/

System out println:
String command: cat > furry.txt;lrp_list;newgrp server1;date
byte[] bytes : cat > furry.txt;lrp_list;newgrp server1;date
ByteArrayInputStream bais: java.io.ByteArrayInputStream@a90653
Input stream in : com.jcraft.jsch.Channel$MyPipedInputStream@30c221
command:channel.setInputStream(in);//this loads .profile at least
if i try command:channel.setInputStream(System.in); //format :java.io.BufferedInputStream@42719c

but either way this thing doesn't excecute the commands, i believe something is wrong with giving String command or the way I send it to the server...

[JosAH]

The point is that this program doesn't excecute commands!!!
so my string command is ("furry.txt;lrp_list;newgrp server1;date");
now how transformation goes from string to InputStream;

You didn't read my previous reply did you? Convert your String to a byte array and use that byte array to create a ByteArrayInputStream; that's all there is to it.

kind regards,

Jos

[Greed]

Yes I did read your last post Joe :)(and documentaition of inputstreams), unfortunatelly this way doesn't work:

  [COLOR="Green"]      String commandToRun= "cat > furry.txt;lrp_list;newgrp server1;date;"+" exit\n";//executing remote scripts
        byte[] bytes = commandToRun.getBytes();
        input= new ByteArrayInputStream(bytes);[/COLOR]
        ((ChannelShell) channel).setInputStream(input); //what does this thing do?
        in = channel.getInputStream();//"Go, I will. Good relations with the Wookiees, I have." Yoda
        channel.connect();
       [COLOR="Green"] channel.setInputStream(input);[/COLOR]//nothing works
        channel.setOutputStream(System.out);//no output

Jsch is a very interesting thing...

[masijade]

Why are you even using setInputStream? Simply write the string to the inputstream. It is as easy as that.

[Greed]

Well thx :) but i found this library sshtools and everything there seems way much easier (Jsch connection - 100 lines of code sshtools-20) + that works +it has documentation!!!! :)