Class: DHCP::OptRouteList

Inherits:
OptListData show all
Defined in:
lib/dhcp/options.rb

Overview

Class for DHCP options containing lists of IPv4 CIDR routes (like option 121 or MS’s 249) See RFC 3442 “compact encoding” of destination

Instance Attribute Summary

Attributes inherited from OptData

#data

Attributes inherited from Opt

#name, #opt

Instance Method Summary collapse

Methods inherited from OptListData

#append, #data=, #each, #get, #initialize, #is_list?, #set, #size, #to_s

Methods inherited from OptData

#get, #initialize, #opt_header, #set, #to_opt, #to_s

Methods inherited from Opt

#initialize, #opt_header, #to_opt, #to_s

Constructor Details

This class inherits a constructor from DHCP::OptListData

Instance Method Details

#bin_to_data(data) ⇒ Object 



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# File 'lib/dhcp/options.rb', line 417

def bin_to_data(data)
  raise "Invalid binary classless route data" unless data.size > 4 || data[0,1].ord > 32
  maskbits = data[0,1].ord
  octets   = (maskbits+7)/8
  raise "Invalid binary classless route data" unless data.size == octets + 5
  dest = IPAddress::IPv4.parse_data(data[1,octets] + 0.chr * (4 - octets))
  dest.prefix = maskbits
  gateway = IPAddress::IPv4.parse_data(data[octets+1,4])
  gateway.prefix = maskbits  ## Unnecessary...
  [dest.to_string, gateway.to_s]
end

#data_to_bin(data) ⇒ Object 



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# File 'lib/dhcp/options.rb', line 406

def data_to_bin(data)
  raise "Invalid classless static route" unless data.is_a?(Array) && data.size == 2
  net, gateway = *data
  raise "Invalid classless static route network" if net.index('/').nil?
  net = IPAddress::IPv4.new(net)
  raise "Invalid classless static route network" unless net.network?
  gateway = IPAddress::IPv4.new("#{gateway}/#{net.prefix}")
  raise "Invalid classless static route gateway" unless gateway.member?(net)
  net.prefix.to_i.chr + net.data[0,(net.prefix+7)/8] + gateway.data
end

#split_data(data) ⇒ Object 



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# File 'lib/dhcp/options.rb', line 394

def split_data(data)
  data = data.dup
  list = []
  while data.size > 0
    raise "Invalid binary data" unless data.size > 4 || data[0,1].ord > 32
    octets = (data[0,1].ord + 7)/8
    raise "Invalid binary data" unless data.size >= octets + 5
    list << bin_to_data(data.slice!(0,octets+5))
 end
 list
end