Module: TestLab::Utility::CIDR

Included in:
TestLab::Utility
Defined in:
lib/testlab/utility/cidr.rb

Overview

CIDR Module

Author:

  • Zachary Patten <zachary AT jovelabs DOT com>

Constant Summary collapse

CIDR_MATRIX = 
{
  32 => { :netmask => '255.255.255.255', :broadcast => '%s.%s.%s.%s',     :network => '%s.%s.%s.%s' },
  31 => { :netmask => '255.255.255.254', :broadcast => '%s.%s.%s.1',      :network => '%s.%s.%s.254' },
  30 => { :netmask => '255.255.255.252', :broadcast => '%s.%s.%s.3',      :network => '%s.%s.%s.252' },
  29 => { :netmask => '255.255.255.248', :broadcast => '%s.%s.%s.7',      :network => '%s.%s.%s.248' },
  28 => { :netmask => '255.255.255.240', :broadcast => '%s.%s.%s.15',     :network => '%s.%s.%s.240' },
  27 => { :netmask => '255.255.255.224', :broadcast => '%s.%s.%s.31',     :network => '%s.%s.%s.224' },
  26 => { :netmask => '255.255.255.192', :broadcast => '%s.%s.%s.63',     :network => '%s.%s.%s.192' },
  25 => { :netmask => '255.255.255.128', :broadcast => '%s.%s.%s.127',    :network => '%s.%s.%s.128' },
  24 => { :netmask => '255.255.255.0',   :broadcast => '%s.%s.%s.255',    :network => '%s.%s.%s.0' },
  23 => { :netmask => '255.255.254.0',   :broadcast => '%s.%s.1.255',     :network => '%s.%s.254.0' },
  22 => { :netmask => '255.255.252.0',   :broadcast => '%s.%s.3.255',     :network => '%s.%s.252.0' },
  21 => { :netmask => '255.255.248.0',   :broadcast => '%s.%s.7.255',     :network => '%s.%s.248.0' },
  20 => { :netmask => '255.255.240.0',   :broadcast => '%s.%s.15.255',    :network => '%s.%s.240.0' },
  19 => { :netmask => '255.255.224.0',   :broadcast => '%s.%s.31.255',    :network => '%s.%s.224.0' },
  18 => { :netmask => '255.255.192.0',   :broadcast => '%s.%s.63.255',    :network => '%s.%s.192.0' },
  17 => { :netmask => '255.255.128.0',   :broadcast => '%s.%s.127.255',   :network => '%s.%s.128.0' },
  16 => { :netmask => '255.255.0.0',     :broadcast => '%s.%s.255.255',   :network => '%s.%s.0.0' },
  15 => { :netmask => '255.254.0.0',     :broadcast => '%s.1.255.255',    :network => '%s.254.0.0' },
  14 => { :netmask => '255.252.0.0',     :broadcast => '%s.3.255.255',    :network => '%s.252.0.0' },
  13 => { :netmask => '255.248.0.0',     :broadcast => '%s.7.255.255',    :network => '%s.248.0.0' },
  12 => { :netmask => '255.240.0.0',     :broadcast => '%s.15.255.255',   :network => '%s.240.0.0' },
  11 => { :netmask => '255.224.0.0',     :broadcast => '%s.31.255.255',   :network => '%s.224.0.0' },
  10 => { :netmask => '255.192.0.0',     :broadcast => '%s.63.255.255',   :network => '%s.192.0.0' },
   9 => { :netmask => '255.128.0.0',     :broadcast => '%s.127.255.255',  :network => '%s.128.0.0' },
   8 => { :netmask => '255.0.0.0',       :broadcast => '%s.255.255.255',  :network => '%s.0.0.0' },
   7 => { :netmask => '254.0.0.0',       :broadcast => '1.255.255.255',   :network => '254.0.0.0' },
   6 => { :netmask => '252.0.0.0',       :broadcast => '3.255.255.255',   :network => '252.0.0.0' },
   5 => { :netmask => '248.0.0.0',       :broadcast => '7.255.255.255',   :network => '248.0.0.0' },
   4 => { :netmask => '240.0.0.0',       :broadcast => '15.255.255.255',  :network => '240.0.0.0' },
   3 => { :netmask => '224.0.0.0',       :broadcast => '31.255.255.255',  :network => '224.0.0.0' },
   2 => { :netmask => '192.0.0.0',       :broadcast => '63.255.255.255',  :network => '192.0.0.0' },
   1 => { :netmask => '128.0.0.0',       :broadcast => '127.255.255.255', :network => '128.0.0.0' },
   0 => { :netmask => '0.0.0.0',         :broadcast => '255.255.255.255', :network => '0.0.0.0' }
}

Instance Method Summary collapse

Instance Method Details

#arpa(ip) ⇒ Object 



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# File 'lib/testlab/utility/cidr.rb', line 121

def arpa(ip)
  [arpa_octets(ip), 'in-addr', 'arpa'].flatten.join('.')
end

#arpa_octets(ip, fill = nil) ⇒ Object 



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# File 'lib/testlab/utility/cidr.rb', line 99

def arpa_octets(ip, fill=nil)
  ip, cidr = ip.split('/')
  oct = octets(ip)

  result = case cidr.to_i
  when 0..7 then
    [fill, fill, fill, fill]
  when 8..15 then
    [oct[0,1], fill, fill, fill]
  when 16..23 then
    [oct[0,2], fill, fill]
  when 24..31 then
    [oct[0,3], fill]
  end

  result.flatten.compact.reverse
end

#broadcast(ip) ⇒ Object

Returns the broadcast address



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# File 'lib/testlab/utility/cidr.rb', line 76

def broadcast(ip)
  ip, cidr = ip.split('/')
  cidr_matrix(cidr)[:broadcast] % ip.split('.')
end

#cidr(ip) ⇒ Object 



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# File 'lib/testlab/utility/cidr.rb', line 52

def cidr(ip)
  ip.split('/').last.to_i
end

#cidr_matrix(cidr) ⇒ Object 



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# File 'lib/testlab/utility/cidr.rb', line 60

def cidr_matrix(cidr)
  CIDR_MATRIX[cidr.to_i]
end

#cidr_octets(ip, fill = nil) ⇒ Object 



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# File 'lib/testlab/utility/cidr.rb', line 81

def cidr_octets(ip, fill=nil)
  ip, cidr = ip.split('/')
  oct = octets(ip)

  result = case cidr.to_i
  when 0..7 then
    oct[-4,4]
  when 8..15 then
    [fill, oct[-3,3]]
  when 16..23 then
    [fill, fill, oct[-2,2]]
  when 24..31 then
    [fill, fill, fill, oct[-1,1]]
  end

  result.flatten.compact
end

#ip(ip) ⇒ Object 



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# File 'lib/testlab/utility/cidr.rb', line 48

def ip(ip)
  ip.split('/').first
end

#netmask(ip) ⇒ Object 



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# File 'lib/testlab/utility/cidr.rb', line 64

def netmask(ip)
  ip, cidr = ip.split('/')
  cidr_matrix(cidr)[:netmask]
end

#network(ip) ⇒ Object

Returns the network address



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# File 'lib/testlab/utility/cidr.rb', line 70

def network(ip)
  ip, cidr = ip.split('/')
  cidr_matrix(cidr)[:network] % ip.split('.')
end

#octets(ip) ⇒ Object 



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# File 'lib/testlab/utility/cidr.rb', line 56

def octets(ip)
  ip.split('.')
end

#ptr(ip) ⇒ Object 



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# File 'lib/testlab/utility/cidr.rb', line 117

def ptr(ip)
  cidr_octets(ip).reverse.join('.')
end