Re: Local tunneling question

Hi,
Thanks for the reply.

This is what I get when I turn debugging output on (some parts ommitted 
for clarity reasons...):

(...)

Creating VNC tunnel (addLocalForwarding)...
[Thread-5] INFO  forwarding.ForwardingListener  - Creating forwarding 
listener named 'VNC'
[Thread-5] DEBUG forwarding.ForwardingListener  - Address to bind: 0.0.0.0
[Thread-5] DEBUG forwarding.ForwardingListener  - Port to bind: 5920
[Thread-5] DEBUG forwarding.ForwardingListener  - Host to connect: localhost
[Thread-5] DEBUG forwarding.ForwardingListener  - Port to connect: 5920
VNC tunnel started.
[Forwarding listener 2] INFO  forwarding.ForwardingListener  - Starting 
forwarding listener thread for 'VNC'
[Thread-9] INFO  transport.HostKeyVerification  - Could not open or read 
/home/andre/.ssh/known_hosts:  is not supported
[Thread-9] DEBUG net.TransportProviderFactory  - Use normal socket
[Thread-9] INFO  transport.TransportProtocolCommon  - Starting transport 
protocol

(...)

[Forwarding listener 2] INFO  forwarding.ForwardingListener  - 
Connection accepted, creating forwarding channel
[Forwarding listener 2] DEBUG connection.ChannelDataWindow  - Increasing 
window space by 131072
[Forwarding listener 2] INFO  transport.TransportProtocolCommon  - 
Sending SSH_MSG_CHANNEL_OPEN (90)
[Transport protocol 2] DEBUG transport.TransportProtocolCommon  - 
Received SSH_MSG_CHANNEL_DATA
[Transport protocol 2] DEBUG connection.ConnectionProtocol  - Received 2 
bytes of data for channel id 0
[Transport protocol 2] DEBUG transport.TransportProtocolCommon  - 
Received SSH_MSG_CHANNEL_DATA
[Transport protocol 2] DEBUG connection.ConnectionProtocol  - Received 
56 bytes of data for channel id 0
15/05/07 14:54:52 Got connection from client 127.0.0.1
[Transport protocol 1] DEBUG transport.TransportProtocolCommon  - 
Received SSH_MSG_CHANNEL_OPEN_CONFIRMATION

(no more messages after this... VNC password dialog hangs...)

Regards,
    Andre


Bernardo F Costa wrote:
> Hi Andre !
> I never worked with ForwardingClient, but could there
> be any problem if you are using the same port on
> 127.0.0.1 and a.b.c.d (as your ip) ? This is just a
> guess, I mean, the same happens if the biding port of
> localhost is changed ? However, what really could help
> you is trying to log debug messages of
> ForwardingClient class. There were problems of hang
> ups on some other classes, some of them already
> corrected, and if some of these problems persist on
> ForwardingClient then, it is possible taht the log
> messages will show it.
>
> --- Andre Charbonneau
> <[email protected]> escreveu:
>
>   
>> Hi,
>> I'm trying to use the latest release of sshtools to
>> create a local SSH 
>> tunnel to tunnel VNC.  (I know the SSHTerm has a VNC
>> feature, but I 
>> would like to use sshtool to simply create a SSH
>> tunnel and then use 
>> another VNC viewer application through this tunnel.)
>>
>> So I wrote a small java app that simply creates a
>> local forwarding 
>> tunnel, as shown below:
>>
>>       SshClient ssh = null;
>>       ssh = new SshClient();
>>     // Connect and authenticate (GSI)
>>       ssh.connect(connectionProps, new 
>> DialogKnownHostsKeyVerification(null));
>>       SshAuthenticationClient authClient = new
>> GSSAuthenticationClient();
>>      
>> authClient.setHostname(connectionProps.getHost());
>>       authClient.setUsername("");  // Use empty
>> username, GSI will set 
>> the usename to use.
>>       authClient.setProperties(connectionProps);
>>       int result = ssh.authenticate(authClient,
>> connectionProps.getHost());
>>       if(result !=
>> AuthenticationProtocolState.COMPLETE)
>>       {
>>         JOptionPane.showMessageDialog(null,
>>           "Authentication error when creating VNC
>> channel.",
>>           "", JOptionPane.WARNING_MESSAGE);
>>         System.exit(1);
>>       }
>>      
>>       // Create a tunnel for the VNC traffic.
>>         ForwardingClient forwarding =
>> ssh.getForwardingClient();
>>         forwarding.addLocalForwarding("VNC",
>> "0.0.0.0", 5920, 
>> "localhost", 5920);
>>         forwarding.startLocalForwarding("VNC");
>>       System.out.println("VNC tunnel started.");
>>       
>>         // And also open a shell to see what's going
>> on...
>>         SessionChannelClient
>> session=ssh.openSessionChannel();
>>         if
>>
>>     
> (!session.requestPseudoTerminal("vt100",80,24,0,0,""))
>   
>>           System.out.println("Failed to allocate a
>> pseudo terminal");
>>         if (session.startShell())
>>         {
>>           InputStream in=session.getInputStream();
>>           OutputStream
>> out=session.getOutputStream();
>>           IOStreamConnector input=new
>> IOStreamConnector(System.in,out);
>>           IOStreamConnector output=new
>> IOStreamConnector(in,System.out);
>>          
>>
>>     
> output.getState().waitForState(IOStreamConnectorState.CLOSED);
>   
>>         }
>>
>>
>> My tightvnc server is listening on a.b.c:5920.
>>
>> If I use the command-line vncviewer to directly
>> access the VNC server 
>> listening on a.b.c:5920, everything works fine.  But
>> when I try to use 
>> the tunnel created by the code above (by using the
>> command: xvncviewer 
>> a.b.c::5920), the vncviewer hangs after the password
>> prompt and the only 
>> output log I get on the vnc server side is:
>>
>>     15/05/07 10:53:37 Got connection from client
>> 127.0.0.1
>>  
>> I suspect I'm not setting up the ssh tunnel
>> correctly...  Any ideas what 
>> I might be doing wrong?
>>
>> Any information about this would be much
>> appreciated.
>>
>> Thanks,
>>     Andre
>>
>>
>>
>>
>>     
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