require 'rubygems'
require 'net/ssh'


def passWord(hostname, username, password, newPassword)
	begin
		Net::SSH.start( hostname, username, :password => password ) do |session|
			command = "passwd"
			session.exec( command ) do |channel,stream,data|
			case stream
				when :stderr
					puts "E-> #{data}"
					case data
						when /\(current\) UNIX password:/
						channel.send_data password + "\n"
						puts "********"
					when /Enter new UNIX password:/
						channel.send_data newPassword + "\n"
						puts "********"
					when /Retype new UNIX password:/
						channel.send_data newPassword + "\n"
						puts "********"
					when /.*(successfully).*/
						return "OK"
					else
						puts "DEATH!"
						exit
					end
				when :stdout
					puts "O-> #{data}"
				end
			end
		end
	rescue
		return "NG (#{$!.message})"
	end
end

hostnames = ['']
username = ""
password = ""
newPassword = ""

hostnames.each do |hostname|
	puts "#{hostname}\t\t#{passWord(hostname,username, password, newPassword)}"
end