#!/usr/bin/env ruby
 
require "rubygems"
require "net/ssh"
 
@ssh = Net::SSH.start("192.168.0.10", "user", {:password => "user"})
 
@command_executed = false
 
@ssh.open_channel do |channel|
  channel.request_pty
 
  #callback
  channel.on_data do |channel, stdout_data|
    if stdout_data =~ /assword:/
      channel.send_data "root_pass" + "\n"
    elsif !@su_command_executed
      channel.send_data "whoami" + "\n"
      @command_executed = true
    else
      print stdout_data
 
      # channel.eof! でSSHのチャンネルが切れない
      channel.eof!
    end
 
    # これだと
    #
    # whoami
    # root
    # root@cl1:~#
    #
    # の出力が無限に出続ける
    #
    # su - でrootになって一回コマンド実行して、stdout/stderr/戻り値をもらってチャンネル閉じたい
    puts stdout_data
  end
 
  channel.exec "LANG=C su -"
end
 
@ssh.loop
 
@ssh.close
 

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