Class: Resolv::IPv6

Inherits:
Object
  • Object
show all
Defined in:
lib/resolv.rb

Overview

A Resolv::DNS IPv6 address.

Constant Summary collapse

Regex_8Hex =

IPv6 address format a:b:c:d:e:f:g:h

/\A
(?:[0-9A-Fa-f]{1,4}:){7}
   [0-9A-Fa-f]{1,4}
\z/x
Regex_CompressedHex =

Compressed IPv6 address format a::b

/\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
Regex_6Hex4Dec =

IPv4 mapped IPv6 address format a:b:c:d:e:f:w.x.y.z

/\A
((?:[0-9A-Fa-f]{1,4}:){6,6})
(\d+)\.(\d+)\.(\d+)\.(\d+)
\z/x
Regex_CompressedHex4Dec =

Compressed IPv4 mapped IPv6 address format a::b:w.x.y.z

/\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
Regex =

A composite IPv6 address Regexp.

/
(?:#{Regex_8Hex}) |
(?:#{Regex_CompressedHex}) |
(?:#{Regex_6Hex4Dec}) |
(?:#{Regex_CompressedHex4Dec})/x

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(address) ⇒ IPv6

:nodoc:


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# File 'lib/resolv.rb', line 2522

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

Instance Attribute Details

#addressObject (readonly)

The raw IPv6 address as a String.


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# File 'lib/resolv.rb', line 2532

def address
  @address
end

Class Method Details

.create(arg) ⇒ Object

Creates a new IPv6 address from arg which may be:

IPv6

returns arg.

String

arg must match one of the IPv6::Regex* constants


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# File 'lib/resolv.rb', line 2476

def self.create(arg)
  case arg
  when IPv6
    return arg
  when String
    address = ''.b
    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 = ''.b
      a2 = ''.b
      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 = ''.b
        a2 = ''.b
        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

Instance Method Details

#==(other) ⇒ Object

:nodoc:


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# File 'lib/resolv.rb', line 2556

def ==(other) # :nodoc:
  return @address == other.address
end

#eql?(other) ⇒ Boolean

:nodoc:


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# File 'lib/resolv.rb', line 2560

def eql?(other) # :nodoc:
  return self == other
end

#hashObject

:nodoc:


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# File 'lib/resolv.rb', line 2564

def hash # :nodoc:
  return @address.hash
end

#inspectObject

:nodoc:


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# File 'lib/resolv.rb', line 2542

def inspect # :nodoc:
  return "#<#{self.class} #{self}>"
end

#to_nameObject

Turns this IPv6 address into a Resolv::DNS::Name. – ip6.arpa should be searched too. [RFC3152]


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# File 'lib/resolv.rb', line 2551

def to_name
  return DNS::Name.new(
    @address.unpack("H32")[0].split(//).reverse + ['ip6', 'arpa'])
end

#to_sObject

:nodoc:


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# File 'lib/resolv.rb', line 2534

def to_s # :nodoc:
  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