Re: [JSch-users] portForwardL applet trouble

[B. S. S. <sc...@sm...>]

I have made an applet work to do similar things, however, I had to sign 
the jar files to do this.
You may need to run "jarsigner" on the jsch jar file to make it work.

Kalle Bingel wrote:

>I'm struggling with writing an applet which purpose is only to
>establish an ssh-tunnel and do local port forwarding. I also have to
>say that this is my first java program as well (i'm a Perl-man), so my
>java knowledge is somewhat limited.
> 
>However, i've come as far as having succeded to make a small applet
>that establishes contact with my ssh-machine (when i redirect a
>shell-channel to System.out and use something like "ls -lR / | write
>cbing pts/4", the output comes up fine in the java console window) --
>so far so good), but i can't get the actual port forwarding to work.
>The applet listens to the ports set by session.setPortForwarding(
>10080, "1.2.3.4", 80). This i have verified by telneting to the local
>port (10080) and i don't get "Connection refused" as i do when the
>applet is not running. The first time i telnet to the local port, it
>drops the connection (tcp-connection) as soon as i enter some
>characters in telnet ( i.e. "GET /"). The second time, it just "hangs"
>and nothing whatever happens until i unload the applet and the
>connection is dropped (as it should). The applet itself does not hang
>since i'm still able to click on buttons, disconnecting and other
>stuff.
> 
>Is there any special stuff you have to do to get this to work when run
>as an applet within a browser?  I've cutted most of the code from the
>portForwardL.java-example, and adapted it to run as an applet instead.
>I assume that jsch automatically starts a new thread and make all
>magic happen in the background, right, or am i missing out something
>there?
> 
>Do i have to open a channel to get portForwarding to work?  I didn't
>think so since the example PortForwardingL.java has that part
>commented out.
> 
>Another observation is that setTimeout( 5000) throws an exception with
>the following error:
>java.security.AccessControlException: access denied
>(java.lang.RuntimePermission modifyThread)
> 
>I read somewhere that you should call connect with the following:
>            ssh_session.setTimeout( 5000);
>            ssh_session.connect();
>            ssh_session.setTimeout( 0);
>and it is the first setTimeout that throws the exception. I don't know
>if this has anything to do with it?
> 
>I'm using j2sdk 1.4.2_03 if that matters.
> 
>  --Kalle
> 
>My jsch-related code (connection part of the code):
> 
>            ssh_session=jsch.getSession( ssh_user, ssh_host, ssh_port);
>            UserInfo ui=new MyUserInfo();
>            ssh_session.setUserInfo(ui);
>            java.util.Properties config=new java.util.Properties ();
>            config.put("compression.s2c", "none");
>            config.put("compression.c2s", "none");
>            ssh_session.setConfig(config);
>            //ssh_session.setTimeout( 5000);
>            ssh_session.connect();
>            ssh_session.setTimeout( 0);
>            
>            //Channel channel=ssh_session.openChannel("shell"); 
>            //channel.connect();
>            //channel.setOutputStream( System.out);
>            
>            // Do port forwarding (parse arguments)
>            //
>            int port_counter=0;
>            while( getParameter( "port"+port_counter) != null) { 
>                String p_str = getParameter( "port"+port_counter);
>                int p_lport=Integer.parseInt( p_str.substring( 0,
>p_str.indexOf(':')));
>                p_str = p_str.substring( p_str.indexOf(':')+1); 
>                String p_rhost = p_str.substring( 0, p_str.indexOf( ':'));
>                int p_rport = Integer.parseInt( p_str.substring(
>p_str.indexOf(':') + 1));
>                if( p_lport > 0 && p_rport > 0 && !p_rhost.equals( "")) { 
>                    System.out.println( "PortForward:
>LPORT="+p_lport+", RHOST="+p_rhost+", RPORT="+p_rport);
>                    ssh_session.setPortForwardingL( p_lport, p_rhost, p_rport); 
>                } else {
>                    System.out.println( "PortForward: ERROR parsing
>port-param '"+getParameter( "port"+port_counter)+"', skipping.");
>                }
>                port_counter++; 
>            }
>
>
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