class Whatmask

whatmask is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

whatmask is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with whatmask. If not, see <www.gnu.org/licenses/>.

Constants

VERSION: whatmask version

Public Class Methods

new(mask, address=nil) click to toggle source

# File lib/whatmask.rb, line 5
def initialize(mask, address=nil)
  @mask = get_mask(mask)
  if /^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/.match(address)
    @address = octets_to_bin(address)
  end
  @allones = "11111111111111111111111111111111".to_i(2)
  validate(@mask)
end

Public Instance Methods

address() click to toggle source

# File lib/whatmask.rb, line 14
def address
  return bin_to_octets(@address) if @address
end

avail() click to toggle source

# File lib/whatmask.rb, line 56
def avail
  return ((2**(32-cidr))-2) if cidr <= 30
  return 1
end

broadcast() click to toggle source

# File lib/whatmask.rb, line 22
def broadcast
  return bin_to_octets(get_broadcast) if @address
end

cidr() click to toggle source

# File lib/whatmask.rb, line 52
def cidr
  return @mask.to_s(2).count('1')
end

first() click to toggle source

# File lib/whatmask.rb, line 26
def first
  if @mask != @allones
    return bin_to_octets(get_network+1) if @address
  end
  return address if @address
end

hex() click to toggle source

# File lib/whatmask.rb, line 48
def hex
  return bin_to_hex(@mask)
end

inverse() click to toggle source

# File lib/whatmask.rb, line 40
def inverse
  return bin_to_octets(get_inverse)
end

last() click to toggle source

# File lib/whatmask.rb, line 33
def last
  if @mask != @allones
    return bin_to_octets(get_broadcast-1) if @address
  end
  return address if @address
end

mask() click to toggle source

# File lib/whatmask.rb, line 44
def mask
  return bin_to_octets(@mask)
end

network() click to toggle source

# File lib/whatmask.rb, line 18
def network
  return bin_to_octets(get_network) if @address
end

Private Instance Methods

bin_to_32bit(bin) click to toggle source

# File lib/whatmask.rb, line 109
def bin_to_32bit(bin)
  bits = bin.to_s(2)
  while bits.length < 32
    bits = '0'+bits
  end
  return bits if (bits.length <= 32)
  abort 'whatmask: "'+bin+'" is greater than 32 bits!'
end

bin_to_hex(bin) click to toggle source

# File lib/whatmask.rb, line 126
def bin_to_hex(bin)
  bin = bin.to_s(2)
  while bin.length < 32
    bin = '0'+bin
  end
  return '0x'+bin.scan(/.{8}/).map { |b| ('0'+b.to_i(2).to_s(16))[-2,2] }.join
end

bin_to_octets(bin) click to toggle source

# File lib/whatmask.rb, line 118
def bin_to_octets(bin)
  bin = bin.to_s(2)
  while bin.length < 32
    bin = '0'+bin
  end
  return bin.scan(/.{8}/).map { |b| b.to_i(2) }.join('.')
end

cidr_to_bin(cidr) click to toggle source

# File lib/whatmask.rb, line 147
def cidr_to_bin(cidr)
  bin = ''
  if (0..32) === cidr.to_i
    for i in 0..(cidr.to_i-1)
      bin = '1'+bin
    end
    while bin.length < 32
      bin = bin+'0'
    end
    return bin.to_i(2)
  else
    abort 'whatmask: '+cidr+' is an invalid CIDR mask!'
  end
end

get_broadcast() click to toggle source

# File lib/whatmask.rb, line 71
def get_broadcast
  return (get_network | get_inverse)
end

get_inverse() click to toggle source

# File lib/whatmask.rb, line 67
def get_inverse
  return (@mask ^ @allones)
end

get_mask(mask) click to toggle source

# File lib/whatmask.rb, line 97
def get_mask(mask)
  if (/\h\h\h\h\h\h\h\h/ =~ mask) == 2
    return mask.hex
  elsif mask.length <= 2
    return cidr_to_bin(mask)
  elsif /^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/.match(mask)
    return octets_to_bin(mask)
  else
    abort 'whatmask: "'+mask+'" is not a valid subnet mask or wildcard bit mask!'
  end
end

get_network() click to toggle source

# File lib/whatmask.rb, line 63
def get_network
  return (@address & @mask)
end

octets_to_bin(octets) click to toggle source

# File lib/whatmask.rb, line 134
def octets_to_bin(octets)
  bin = octets.split('.').map { |octet|
    octet = octet.to_i.to_s(2)
    if octet.length > 8
      abort 'whatmask: "'+octets+'" is not a valid subnet mask or wildcard bit mask, or ip address!'
    end
    while octet.length < 8
      octet = '0'+octet
    end
    octet }.join.to_i(2)
  return bin
end

validate(mask) click to toggle source

# File lib/whatmask.rb, line 75
def validate(mask)
  mask = bin_to_32bit(mask)
  if mask[0] == '1'
    if /1/.match(mask.sub(/1+/, '0')) == nil
      return 1
    else
      abort 'whatmask: "'+mask+'" is not a valid subnet mask or wildcard bit mask!'
    end
  elsif mask == '0'*32
    return 1
  elsif mask[0] == '0'
    if /0/.match(mask.sub(/0+/, '1')) == nil
      @mask = get_inverse
      return 1
    else
      abort 'whatmask: "'+mask+'" is not a valid subnet mask or wildcard bit mask!'
    end
  else
    abort 'whatmask: error encountered in validation'
  end
end