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#!/usr/bin/env ruby
def ip2num(ip)
ipa = ip.split(".").map(&:to_i)
return (ipa[0] * (256 ** 3)) + (ipa[1] * (256 ** 2)) + (ipa[2] * 256) + ipa[3]
end
def num2ip(ipi)
outa = []
outa[3] = ipi % 256
outa[2] = (ipi / 256) % 256
outa[1] = (ipi / (256 ** 2)) % 256
outa[0] = (ipi / (256 ** 3)) % 256
return outa.map(&:to_s).join(".")
end
def boundarycheck(ip, cidr)
bound = 2**(32-cidr)
return (ip2num(ip) % bound) == 0
end
def addip(ip, x)
ipi = ip2num(ip)
ipi += x
return num2ip(ipi)
end
if ARGV.length == 0 then
puts "Usage: geneni ip[/cidr] iface [alias start]"
exit
end
IPCIDR = ARGV.shift.split("/")
IP = IPCIDR[0]
CIDR = IPCIDR[1].nil? ? 32 : IPCIDR[1].to_i
IFACE = ARGV.shift
START = (ARGV.shift or "1").to_i
unless boundarycheck(IP, CIDR) then
puts "Invalid CIDR Boundary"
exit 1
end
(2**(32-CIDR)).times do |x|
puts "auto #{IFACE}:#{x+START}"
puts "iface #{IFACE}:#{x+START} inet static"
puts "\taddress #{addip(IP, x)}"
puts "\tnetmask #{num2ip(("1"*CIDR + "0"*(32-CIDR)).to_i(2))}"
#puts "\tnetmask 255.255.255.255"
end
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