From: Martin Boese <boesemar@...>
Date: 2007-12-17T15:09:43+09:00
Subject: Re: Net:Telnet to Cisco Router

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I once wrote this attached class to run cisco commands and fetch configs. You 
can run any command with the cmd method, like this will fetch and print a 
running config of a device:

require 'ciscotelnet'

c = CiscoTelnet.new("Host" => '10.253.1.3',
                    "Password" => "XXXX",
                     "Enable" => "yyyyyy",
                     "User" => "martin")
c.open
c.login
c.enable
c.cmd "terminal length 0"
puts c.cmd("show run", 20)


On Friday 14 December 2007 18:27:00 jackster the jackle wrote:
> Hi Ruby Forum,
>
> I have some code that will login to my cisco router and run a basic
> command.
>
> The problem is, I need to get into enable mode to run additional
> command. Getting into enable mode requires typing "enable", waiting for
> the prompt "Password: " then entering another password.
>
> This code works and gets me into the router but not in enable mode:
>
> #!/usr/local/bin/ruby
>
> require 'net/telnet'
>
> CISCO = "172.31.1.1" #Enter the IP address here
> USER = "jsmith" #Enter username here
> PASS = "mypassword" #Enter password here
> ENABLE = "myenablepass" #Enter enable password here
>
> tn = Net::Telnet::new("Host" => CISCO,
> "Timeout" => 5,
> "Prompt" => /Username/ )
>
> tn.cmd("\n#{USER}") { |c| print c }
> tn.cmd(PASS) { |c| print c }
> tn.cmd("sh mod\n") { |c| print c }
>
> Instead of sending the command "sh mod\n" as shown above, I want to get
> into enable mode and send the command "sh run\n".
>
> The problem is, I get to the password prompt but the router is not
> taking my password for some reason and I know the password is good.
>
> Here is the added code that I'm having trouble with:
>
> tn = Net::Telnet::new("Host" => CISCO,
> "Timeout" => 5,
> "Prompt" => /Username: / )
>
> tn.cmd("\n#{USER}") { |c| print c }
> tn.cmd(PASS) { |c| print c }
> tn.cmd("enable\n") { |c| print c }
> tn.waitfor(/Password: /)
> tn.cmd(ENABLE) { |c| print c }
> tn.cmd("sh run\n") { |c| print c }
>
> Any ideas to get me into enable mode here would be greatly appreciated.
> thanks
> jackster



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require 'net/telnet'


class CiscoTelnet
require 'net/telnet'

def initialize options
 @host     = options["Host"] || "localhost"
 @user     = options["User"] || "martin"
 @password = options["Password"] || "nopass"
 @enable   = options["Enable"] || "nopass"
 @debug    = options["Debug"] || false
 @prompt   = nil
end

def debug_out(msg)
 $stdout.puts ">> " + msg if @debug
end

def debug_in(msg)
 $stdout.puts "<< " + msg if @debug
end


def open
 @socket = Net::Telnet.new("Host" => @host)
end

def close
 @socket.close
end

# returns last line received
def expect(str)
  ret = @socket.waitfor("String" => str, "Timeout" => 10) { |rv| debug_in(rv) }
  return ret.split('\n').last.strip
end

# overwrite to match dynamic prompt
def cmd(command, timeout=10)
 debug_out command
 return @socket.cmd("String" => command, "Match" => Regexp.new(Regexp.escape(@prompt)), "Timeout" => timeout) { |c| debug_in(c) }
end

def print(s)
 @socket.print(s) { |c| debug_out c }
end

def puts(s)
 @socket.puts(s) { |c| debug_out c }
end

def login
 expect "Username"
 puts @user
 expect "Password"
 puts @password
 @prompt = expect '>'
 $stdout.puts "prompt is " + @prompt if @debug
end

def enable
 puts "enable"
 expect "Password"
 puts @enable
 @prompt = expect '#'
 $stdout.puts "new prompt is " + @prompt if @debug
end


end



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