RSync + SSH tunneling through firewall

[Andrzej Filip]

Stefaan Lhermitte wrote:
> Indeed, I want to:
> * to start rsync session A->C
> * cannot establish ssh session A->C (firewall)
> * but can establish ssh session A->B and B->C
> 
> I think I understand the ssh hop. If I'm correct. I make a script file 
> ssh-b that I subsequently invoke in the rsync command (./ssh-b).
> 
> Unfortunately I still have a question concerning the ssh-b script.
> I have put:
> 
> #!/bin/sh
> exec ssh myname at host-B ssh "$@"
> 
> What stands the "$@" for?

It means all command line arguments

> When I run the ssh-b script and enter my password for host-B I get the 
> --help printout on my screen?

The script is intended for use with ssh key authentication.
In such case you get no password promts.

> I assume I have to write something like:
> 
> #!/bin/sh
> exec ssh myname at host-B ssh myname at host-C

Yes if you use user names on host A different than on host B and host C.

> But then I get the error:
> Pseudo terminal will not be allocated becausestdin is not a terminal.
> Permission denied.

Can you use key authentication for ssh sessions ?
[ It is the most obvious choice for most (but not all) situations ]

-- 
Andrzej [en:Andrew] Adam Filip anfi at priv.onet.pl anfi at xl.wp.pl
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