From: A LeDonne <aledonne.listmail@...>
Date: 2006-04-21T02:10:28+09:00
Subject: Re: Converting IP range to array of IP's

On 4/20/06, Kris <krisleech@interkonect.com> wrote:
> I'm looking to convert an IP string (ranges, subnet masks or wild-carded
> IP's) in to an array of IP strings:
>
> eg. "192.168.1.1 - 192.168.1.5" => ["192.168.1.1", "192.168.1.2",
> "192.168.1.3", "192.168.1.4", "192.168.1.5"]
>
> Before I embark on this, is there already a ruby class that does it or
> some of this?


Well, starting with ranges, we can make ruby ranges work just fine for
IPAddr objects by defining succ and <=> ...

irb(main):001:0> require 'ipaddr'
=> true
irb(main):002:0> class IPAddr
irb(main):003:1>   def succ()
irb(main):004:2>     return self.clone.set(@addr + 1)
irb(main):005:2>   end
irb(main):006:1>   def <=>(other)
irb(main):007:2>     return @addr <=> other.to_i
irb(main):008:2>   end
irb(main):009:1> end
=> nil
irb(main):010:0> start = IPAddr.new("192.168.1.1")
=> #<IPAddr: IPv4:192.168.1.1/255.255.255.255>
irb(main):011:0> endy = IPAddr.new("192.168.1.5")
=> #<IPAddr: IPv4:192.168.1.5/255.255.255.255>
irb(main):012:0> (start..endy).to_a
=> [#<IPAddr: IPv4:192.168.1.1/255.255.255.255>, #<IPAddr:
IPv4:192.168.1.2/255.255.255.255>, #<IPAddr:
IPv4:192.168.1.3/255.255.255.255>, #<IPAddr:
IPv4:192.168.1.4/255.255.255.255>, #<IPAddr:
IPv4:192.168.1.5/255.255.255.255>]

Maybe that should be added to ipaddr.rb...

-A