module Proxy::DHCP::Infoblox::IpAddressArithmetic

Public Instance Methods

cidr_to_bitmask(prefix_length) click to toggle source
# File lib/smart_proxy_dhcp_infoblox/ip_address_arithmetic.rb, line 16
def cidr_to_bitmask(prefix_length)
  0xFFFFFFFF ^ (2 ** (32-prefix_length) - 1)
end
cidr_to_i(an_address_with_cidr) click to toggle source
# File lib/smart_proxy_dhcp_infoblox/ip_address_arithmetic.rb, line 20
def cidr_to_i(an_address_with_cidr)
  an_address_with_cidr.split("/").last.to_i
end
cidr_to_ip_mask(prefix_length) click to toggle source
# File lib/smart_proxy_dhcp_infoblox/ip_address_arithmetic.rb, line 3
def cidr_to_ip_mask(prefix_length)
  bitmask = 0xFFFFFFFF ^ (2 ** (32-prefix_length) - 1)
  (0..3).map {|i| (bitmask >> i*8) & 0xFF}.reverse.join('.')
end
i_to_ipv4(i) click to toggle source
# File lib/smart_proxy_dhcp_infoblox/ip_address_arithmetic.rb, line 12
def i_to_ipv4(i)
  (0..3).inject([]) {|a, c| a.push((i >> (c * 8)) & 0xFF)}.reverse.join('.')
end
ipv4_to_i(an_address) click to toggle source
# File lib/smart_proxy_dhcp_infoblox/ip_address_arithmetic.rb, line 8
def ipv4_to_i(an_address)
  an_address.split('.').inject(0) {|a, c| (a << 8) + c.to_i}
end
network_cidr_to_range(network_and_cidr) click to toggle source
# File lib/smart_proxy_dhcp_infoblox/ip_address_arithmetic.rb, line 24
def network_cidr_to_range(network_and_cidr)
  network_addr, cidr = network_and_cidr.split('/')
  mask = cidr_to_bitmask(cidr.to_i)

  range_start = ipv4_to_i(network_addr) & mask
  range_end = range_start | (0xFFFFFFFF ^ mask)

  [i_to_ipv4(range_start), i_to_ipv4(range_end)]
end