From: "Rudá G." <lists@...>
Date: 2013-05-08T23:32:30+09:00
Subject: Connect to a switch with SSH

I need connect to a Cisco Switch with SSH and Ruby. The main problem is
the authentication which is different. I must enter 'login as', 'User
Name' and 'Password'. The 'login as' can be any value, usually I just
press enter (empty value).

My first try was with Net::SSH but it was impossible to authenticate. I
don't know if I did something wrong but I had always the
Net::SSH::AuthenticationFailed error then I gave up.

Now I'm trying with Plink (a command-line interface to the PuTTY back
ends). On the shell I do like this:


plink -ssh user@XX.XX.XXX.XX
User Name: <enter user here>
Password: <enter pass here>
Commands...


Now I need call and interact with Plink on Ruby. My last try was this:

IO.popen "plink -ssh user@#{CISCO}", 'w+' do |io|
  io.each do |line|
    puts line
  if line.include?('User Name')
    io.write(USER)
  elsif line.include?('Password')
    io.write(PASS)
  end
  end
end

and the error was:
'write': Broken pipe <Errno::EPIPE>

What am I doing wrong?

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