openssh start another ssh session on machine b

jhuijsing has asked for the wisdom of the Perl Monks concerning the following question:

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Re: openssh start another ssh session on machine b by salva (Canon) on Mar 27, 2014 at 08:47 UTC
You can use the `ProxyCommand` feature of `OpenSSH` (requires tunnels enabled on host b and a relatively recent version of `OpenSSH` on the local host): `my $ssh_b = Net::OpenSSH->new($host_b, ...); $ssh_b->error and die; my $tunnel_cmd = $ssh_b->make_remote_command({tunnel => 1}, $host_c, 2 +2); my $ssh_c = Net::OpenSSH->new($host_c, master_opts => [-o => "ProxyCom +mand=$tunnel_cmd"], ...); $ssh_c->error and die; $ssh_c->system('ls');` [download] Another option is to install Net::OpenSSH::Gateway available from GitHub. `my $ssh_c = Net::OpenSSH->new($host_c, gateway => { proxy => "ssh://$h +ost_b"}, ...);` [download] That module implements a set of strategies to forward SSH connections over different kinds of proxies including SSH gateways. It is not on CPAN because I was not happy with its internal architecture and planed to revamp it completely but unfortunately, I never got the time (or the guts) to actually do it and it has languished there. In any case I would fix any bug reported.	[reply] [d/l] [select]
Re^2: openssh start another ssh session on machine b by jhuijsing (Acolyte) on Mar 31, 2014 at 03:53 UTC
Can't install anything on machine "B" easily. Have to get vendor approval. What I need to do is ssh to "B" and then ssh to a different port on the "B" to start a CLI session.	[reply]
Re^3: openssh start another ssh session on machine b by salva (Canon) on Mar 31, 2014 at 07:26 UTC
Neither of the two methods exposed on my previous post require installing anything on host B. Everything is done in host A.	[reply]
Re: openssh start another ssh session on machine b by zentara (Cardinal) on Mar 27, 2014 at 10:07 UTC
ssh chain might be of interest to you. I'm not really a human, but I play one on earth. Old Perl Programmer Haiku ................... flash japh	[reply]
Re: openssh start another ssh session on machine b by Anonymous Monk on Mar 27, 2014 at 06:22 UTC
is easy, you run a program on machine b, which opens a connection to machine c	[reply]
Re^2: openssh start another ssh session on machine b by jhuijsing (Acolyte) on Mar 27, 2014 at 06:51 UTC
not very helpful but is probably my own fault. Brains not firing on all cylinders. Yes I could do openssh->system call. But I need to pass a user name and password (cannot not use keys) and some other options. I just don't know enough about how use the pty. so that i can start another ssh session and pass the options I need	[reply]
Re^3: openssh start another ssh session on machine b by Anonymous Monk on Mar 27, 2014 at 07:08 UTC
... cannot not use keys ... I just don't know enough about how use the pty. so that i can start another ssh session and pass the options I need Did you try something? What happened? I would do `system qw[ thenewprogram.pl usrname password whateverelseiyouneed ];` ... or Proc::Background if needed And inside `thenewprogram.pl` just do regular old `Net::OpenSSH->new('username:password@hostname.example'); ... error checking ...` and ...	[reply] [d/l] [select]