/vendor/Dnsruby-1.0/Dnsruby/ipv6.rb
Ruby | 144 lines | 101 code | 13 blank | 30 comment | 13 complexity | b8e49f13ccf4c196368fe81414017aa3 MD5 | raw file
- #--
- #Copyright 2007 Nominet UK
- #
- #Licensed under the Apache License, Version 2.0 (the "License");
- #you may not use this file except in compliance with the License.
- #You may obtain a copy of the License at
- #
- # http://www.apache.org/licenses/LICENSE-2.0
- #
- #Unless required by applicable law or agreed to in writing, software
- #distributed under the License is distributed on an "AS IS" BASIS,
- #WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- #See the License for the specific language governing permissions and
- #limitations under the License.
- #++
- module Dnsruby
- #Dnsruby::IPv6 class
- class IPv6
- #IPv6 address format a:b:c:d:e:f:g:h
- Regex_8Hex = /\A
- (?:[0-9A-Fa-f]{1,4}:){7}
- [0-9A-Fa-f]{1,4}
- \z/x
-
- #Compresses IPv6 format a::b
- Regex_CompressedHex = /\A
- ((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?) ::
- ((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)
- \z/x
-
- # IPv4 mapped IPv6 address format a:b:c:d:e:f:w.x.y.z
- Regex_6Hex4Dec = /\A
- ((?:[0-9A-Fa-f]{1,4}:){6,6})
- (\d+)\.(\d+)\.(\d+)\.(\d+)
- \z/x
-
- # Compressed IPv4 mapped IPv6 address format a::b:w.x.y.z
- Regex_CompressedHex4Dec = /\A
- ((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?) ::
- ((?:[0-9A-Fa-f]{1,4}:)*)
- (\d+)\.(\d+)\.(\d+)\.(\d+)
- \z/x
-
- # A composite IPv6 address RegExp
- Regex = /
- (?:#{Regex_8Hex}) |
- (?:#{Regex_CompressedHex}) |
- (?:#{Regex_6Hex4Dec}) |
- (?:#{Regex_CompressedHex4Dec})/x
-
- # Created a new IPv6 address from +arg+ which may be:
- #
- #* IPv6:: returns +arg+
- #* String:: +arg+ must match one of the IPv6::Regex* constants
- def self.create(arg)
- case arg
- when IPv6
- return arg
- when String
- address = ''
- if Regex_8Hex =~ arg
- arg.scan(/[0-9A-Fa-f]+/) {|hex| address << [hex.hex].pack('n')}
- elsif Regex_CompressedHex =~ arg
- prefix = $1
- suffix = $2
- a1 = ''
- a2 = ''
- prefix.scan(/[0-9A-Fa-f]+/) {|hex| a1 << [hex.hex].pack('n')}
- suffix.scan(/[0-9A-Fa-f]+/) {|hex| a2 << [hex.hex].pack('n')}
- omitlen = 16 - a1.length - a2.length
- address << a1 << "\0" * omitlen << a2
- elsif Regex_6Hex4Dec =~ arg
- prefix, a, b, c, d = $1, $2.to_i, $3.to_i, $4.to_i, $5.to_i
- if (0..255) === a && (0..255) === b && (0..255) === c && (0..255) === d
- prefix.scan(/[0-9A-Fa-f]+/) {|hex| address << [hex.hex].pack('n')}
- address << [a, b, c, d].pack('CCCC')
- else
- raise ArgumentError.new("not numeric IPv6 address: " + arg)
- end
- elsif Regex_CompressedHex4Dec =~ arg
- prefix, suffix, a, b, c, d = $1, $2, $3.to_i, $4.to_i, $5.to_i, $6.to_i
- if (0..255) === a && (0..255) === b && (0..255) === c && (0..255) === d
- a1 = ''
- a2 = ''
- prefix.scan(/[0-9A-Fa-f]+/) {|hex| a1 << [hex.hex].pack('n')}
- suffix.scan(/[0-9A-Fa-f]+/) {|hex| a2 << [hex.hex].pack('n')}
- omitlen = 12 - a1.length - a2.length
- address << a1 << "\0" * omitlen << a2 << [a, b, c, d].pack('CCCC')
- else
- raise ArgumentError.new("not numeric IPv6 address: " + arg)
- end
- else
- raise ArgumentError.new("not numeric IPv6 address: " + arg)
- end
- return IPv6.new(address)
- else
- raise ArgumentError.new("cannot interpret as IPv6 address: #{arg.inspect}")
- end
- end
-
- def initialize(address) #:nodoc:
- unless address.kind_of?(String) && address.length == 16
- raise ArgumentError.new('IPv6 address must be 16 bytes')
- end
- @address = address
- end
-
- # The raw IPv6 address as a String
- attr_reader :address
-
- def to_s
- address = sprintf("%X:%X:%X:%X:%X:%X:%X:%X", *@address.unpack("nnnnnnnn"))
- unless address.sub!(/(^|:)0(:0)+(:|$)/, '::')
- address.sub!(/(^|:)0(:|$)/, '::')
- end
- return address
- end
-
- def inspect #:nodoc:
- return "#<#{self.class} #{self.to_s}>"
- end
- #Turns this IPv6 address into a Dnsruby::Name
- #--
- # ip6.arpa should be searched too. [RFC3152]
- def to_name
- return Name.create(
- # @address.unpack("H32")[0].split(//).reverse + ['ip6', 'arpa'])
- @address.unpack("H32")[0].split(//).reverse.join(".") + ".ip6.arpa")
- end
-
- def ==(other) #:nodoc:
- return @address == other.address
- end
-
- def eql?(other) #:nodoc:
- return self == other
- end
-
- def hash
- return @address.hash
- end
- end
- end