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Re: openssh start another ssh session on machine b

by salva (Abbot)
on Mar 27, 2014 at 08:47 UTC ( #1079891=note: print w/replies, xml ) Need Help??

in reply to openssh start another ssh session on machine b

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');
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"}, ...);
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.

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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.
      Neither of the two methods exposed on my previous post require installing anything on host B. Everything is done in host A.

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