Hi Andre,
Many thanks for your help!
You're right, the problem is on the version of the SSH Server : 2.0 on B,
1.5 on C.
Only the 2.0 protocol is supported in JSCH, so the port forwarding can't
work.
I asked to the administrator of server B if he can migrate to SSH 2... I'm
waiting for his answer...
I found a way to solve my problem using an other Java API, but the jsch
solution would be better.
Regards,
Antoine.
2008/4/15, Andre Charbonneau <[EMAIL PROTECTED]>:
>
> Hi Antoine,
> Hmmm, I never got that error before.
> What version of the SSH server are you running on B and C?
>
> Regards,
>
> Andre
>
>
> Antoine B wrote:
> > Thanks for your help Andre!
> >
> > Here is my code :
> >
> > JSch jsch = new JSch();
> > Session session = jsch.getSession("mylogin","B",22);
> > UserInfo ui = new MyUserInfo();
> > session.setUserInfo(ui);
> > session.connect();
> >
> > // Setup port forwarding
> > int assinged_port = session.setPortForwardingL(0,"C",22);
> >
> > // Connecting to remote system through port forwarding...
> > Session session2 = jsch.getSession("mylogin","127.0.0.1
> > ",assinged_port);
> > session2.setUserInfo(ui);
> > session2.connect();
> >
> > // We are now connected to system C (through B).
> > // Lets run a command on system C
> > Channel channel = session2.openChannel("exec");
> > ((ChannelExec) channel).setCommand("ls -l");
> > channel.connect();
> >
> > channel.setInputStream(System.in);
> > channel.setOutputStream(System.out);
> >
> > and here is the error raised on session2.connect() :
> >
> > com.jcraft.jsch.JSchException: invalid server's version
> > stringcom.jcraft.jsch.JSchException: invalid server's version string
> >
> > at com.jcraft.jsch.Session.connect(Session.java:256)
> > at com.jcraft.jsch.Session.connect(Session.java:149)
> > at UserAuthKI.main(UserAuthKI.java:30)
> >
> > Perhaps it's because C is only reachable through B?
> >
> >
> > 2008/4/14, Andre Charbonneau <[EMAIL PROTECTED]>:
> >> Hello,
> >> Supposing we have 3 systems, A, B and C, here is how I do it in my
> >> application:
> >>
> >> JSch jsch = new JSch();
> >> session = jsch.getSession(
> >> "<username on system B>",
> >> "<hostname of system B>",
> >> "<ssh port on system B>");
> >> UserInfo ui = MyUserInfo();
> >> session.setUserInfo(ui);
> >> session.connect();
> >>
> >> // Setup port forwarding
> >> int assinged_port = session.setPortForwardingL(
> >> 0,
> >> <hostname of system C>,
> >> <ssh port on system C>);
> >>
> >> // Connecting to remote system through port forwarding...
> >> Session session2 = jsch.getSession(
> >> <username on system C>,
> >> "127.0.0.1",
> >> assinged_port);
> >> session2.setUserInfo(ui);
> >> session2.connect();
> >>
> >> // We are now connected to system C (through B).
> >> // Lets run a command on system C
> >> Channel channel = session2.openChannel("exec");
> >> ((ChannelExec) channel).setCommand(<command to run on C>);
> >> channel.connect();
> >>
> >>
> >>
> >> Hope this helps,
> >>
> >> Andre
> >>
> >>
> >> Antoine B wrote:
> >>
> >>> Hello,
> >>> What I want to do is simple :
> >>> I want to connect on a server 'serv1', then with that connection
> opened
> >>> I
> >>> want to connect on a server 'serv2'. After that, I want to execute a
> >>> script
> >>> located on serv2.
> >>> I want to do it automatically, without user's interaction (the users
> >>> don't
> >>> need to write in a shell for example).
> >>> 'serv2' is only accessible from 'serv1' (no direct connnection is
> >>> allowed).
> >>> Is it possible with jsch?
> >>> For the moment, I can open a connection on serv1, but the user had to
> >>> type
> >>> "ssh serv2" on the opened shell.
> >>> Thanks and sorry for my english.
> >>>
> >>>
> >>>
> >>>
> ------------------------------------------------------------------------
> >>>
> >>>
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> >>>
> >>
> >> --
> >> Andre Charbonneau
> >> Research Computing Support, IMSB
> >> National Research Council Canada
> >> 100 Sussex Drive, Rm 2025
> >> Ottawa, ON, Canada K1A 0R6
> >> 613 993-3129
> >>
> >
>
>
> --
> Andre Charbonneau
> Research Computing Support, IMSB
> National Research Council Canada
> 100 Sussex Drive, Rm 2025
> Ottawa, ON, Canada K1A 0R6
> 613 993-3129
>
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