So, is remA a Solaris box? Is mconnect available there? If so, you can use it to create a direct ssh connection from your PC to remB through remA: 
$ ssh -o 'ProxyCommand ssh remA mconnect -r -p 22 remB' remB

[download]
As you can run Perl scripts in remA, another solution would be to implement your own netcat (or mconnect) in Perl.

And you can combine that with the multiplexing feature: 

$ ssh -M -S ~/.ssh/mux_socket -o 'ProxyCommand ssh remA mconnect -r -p
+ 22 remB' -N remB
$ ssh -S ~/.ssh/mux_socket remB COMMAND1
$ ssh -S ~/.ssh/mux_socket remB COMMAND2
...

[download]

In reply to Re^7: Why I'm Populating authorized_keys with Expect by salva
in thread Populating authorized_keys with Expect by cmv

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