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Edit File : ipaddr.rb \| Size : 17.05 KB
# # ipaddr.rb - A class to manipulate an IP address # # Copyright (c) 2002 Hajimu UMEMOTO <ume@mahoroba.org>. # Copyright (c) 2007, 2009, 2012 Akinori MUSHA <knu@iDaemons.org>. # All rights reserved. # # You can redistribute and/or modify it under the same terms as Ruby. # # $Id: ipaddr.rb 52360 2015-10-29 14:36:05Z usa $ # # Contact: # - Akinori MUSHA <knu@iDaemons.org> (current maintainer) # # TODO: # - scope_id support # require 'socket' # IPAddr provides a set of methods to manipulate an IP address. Both IPv4 and # IPv6 are supported. # # == Example # # require 'ipaddr' # # ipaddr1 = IPAddr.new "3ffe:505:2::1" # # p ipaddr1 #=> #<IPAddr: IPv6:3ffe:0505:0002:0000:0000:0000:0000:0001/ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff> # # p ipaddr1.to_s #=> "3ffe:505:2::1" # # ipaddr2 = ipaddr1.mask(48) #=> #<IPAddr: IPv6:3ffe:0505:0002:0000:0000:0000:0000:0000/ffff:ffff:ffff:0000:0000:0000:0000:0000> # # p ipaddr2.to_s #=> "3ffe:505:2::" # # ipaddr3 = IPAddr.new "192.168.2.0/24" # # p ipaddr3 #=> #<IPAddr: IPv4:192.168.2.0/255.255.255.0> class IPAddr # 32 bit mask for IPv4 IN4MASK = 0xffffffff # 128 bit mask for IPv4 IN6MASK = 0xffffffffffffffffffffffffffffffff # Format string for IPv6 IN6FORMAT = (["%.4x"] * 8).join(':') # Regexp _internally_ used for parsing IPv4 address. RE_IPV4ADDRLIKE = %r{ \A (\d+) \. (\d+) \. (\d+) \. (\d+) \z }x # Regexp _internally_ used for parsing IPv6 address. RE_IPV6ADDRLIKE_FULL = %r{ \A (?: (?: [\da-f]{1,4} : ){7} [\da-f]{1,4} \| ( (?: [\da-f]{1,4} : ){6} ) (\d+) \. (\d+) \. (\d+) \. (\d+) ) \z }xi # Regexp _internally_ used for parsing IPv6 address. RE_IPV6ADDRLIKE_COMPRESSED = %r{ \A ( (?: (?: [\da-f]{1,4} : )* [\da-f]{1,4} )? ) :: ( (?: ( (?: [\da-f]{1,4} : )* ) (?: [\da-f]{1,4} \| (\d+) \. (\d+) \. (\d+) \. (\d+) ) )? ) \z }xi # Generic IPAddr related error. Exceptions raised in this class should # inherit from Error. class Error < ArgumentError; end # Raised when the provided IP address is an invalid address. class InvalidAddressError < Error; end # Raised when the address family is invalid such as an address with an # unsupported family, an address with an inconsistent family, or an address # who's family cannot be determined. class AddressFamilyError < Error; end # Raised when the address is an invalid length. class InvalidPrefixError < InvalidAddressError; end # Returns the address family of this IP address. attr_reader :family # Creates a new ipaddr containing the given network byte ordered # string form of an IP address. def IPAddr::new_ntoh(addr) return IPAddr.new(IPAddr::ntop(addr)) end # Convert a network byte ordered string form of an IP address into # human readable form. def IPAddr::ntop(addr) case addr.size when 4 s = addr.unpack('C4').join('.') when 16 s = IN6FORMAT % addr.unpack('n8') else raise AddressFamilyError, "unsupported address family" end return s end # Returns a new ipaddr built by bitwise AND. def &(other) return self.clone.set(@addr & coerce_other(other).to_i) end # Returns a new ipaddr built by bitwise OR. def \|(other) return self.clone.set(@addr \| coerce_other(other).to_i) end # Returns a new ipaddr built by bitwise right-shift. def >>(num) return self.clone.set(@addr >> num) end # Returns a new ipaddr built by bitwise left shift. def <<(num) return self.clone.set(addr_mask(@addr << num)) end # Returns a new ipaddr built by bitwise negation. def ~ return self.clone.set(addr_mask(~@addr)) end # Returns true if two ipaddrs are equal. def ==(other) other = coerce_other(other) return @family == other.family && @addr == other.to_i end # Returns a new ipaddr built by masking IP address with the given # prefixlen/netmask. (e.g. 8, 64, "255.255.255.0", etc.) def mask(prefixlen) return self.clone.mask!(prefixlen) end # Returns true if the given ipaddr is in the range. # # e.g.: # require 'ipaddr' # net1 = IPAddr.new("192.168.2.0/24") # net2 = IPAddr.new("192.168.2.100") # net3 = IPAddr.new("192.168.3.0") # p net1.include?(net2) #=> true # p net1.include?(net3) #=> false def include?(other) other = coerce_other(other) if ipv4_mapped? if (@mask_addr >> 32) != 0xffffffffffffffffffffffff return false end mask_addr = (@mask_addr & IN4MASK) addr = (@addr & IN4MASK) family = Socket::AF_INET else mask_addr = @mask_addr addr = @addr family = @family end if other.ipv4_mapped? other_addr = (other.to_i & IN4MASK) other_family = Socket::AF_INET else other_addr = other.to_i other_family = other.family end if family != other_family return false end return ((addr & mask_addr) == (other_addr & mask_addr)) end alias === include? # Returns the integer representation of the ipaddr. def to_i return @addr end # Returns a string containing the IP address representation. def to_s str = to_string return str if ipv4? str.gsub!(/\b0{1,3}([\da-f]+)\b/i, '\1') loop do break if str.sub!(/\A0:0:0:0:0:0:0:0\z/, '::') break if str.sub!(/\b0:0:0:0:0:0:0\b/, ':') break if str.sub!(/\b0:0:0:0:0:0\b/, ':') break if str.sub!(/\b0:0:0:0:0\b/, ':') break if str.sub!(/\b0:0:0:0\b/, ':') break if str.sub!(/\b0:0:0\b/, ':') break if str.sub!(/\b0:0\b/, ':') break end str.sub!(/:{3,}/, '::') if /\A::(ffff:)?([\da-f]{1,4}):([\da-f]{1,4})\z/i =~ str str = sprintf('::%s%d.%d.%d.%d', $1, $2.hex / 256, $2.hex % 256, $3.hex / 256, $3.hex % 256) end str end # Returns a string containing the IP address representation in # canonical form. def to_string return _to_string(@addr) end # Returns a network byte ordered string form of the IP address. def hton case @family when Socket::AF_INET return [@addr].pack('N') when Socket::AF_INET6 return (0..7).map { \|i\| (@addr >> (112 - 16 * i)) & 0xffff }.pack('n8') else raise AddressFamilyError, "unsupported address family" end end # Returns true if the ipaddr is an IPv4 address. def ipv4? return @family == Socket::AF_INET end # Returns true if the ipaddr is an IPv6 address. def ipv6? return @family == Socket::AF_INET6 end # Returns true if the ipaddr is an IPv4-mapped IPv6 address. def ipv4_mapped? return ipv6? && (@addr >> 32) == 0xffff end # Returns true if the ipaddr is an IPv4-compatible IPv6 address. def ipv4_compat? if !ipv6? \|\| (@addr >> 32) != 0 return false end a = (@addr & IN4MASK) return a != 0 && a != 1 end # Returns a new ipaddr built by converting the native IPv4 address # into an IPv4-mapped IPv6 address. def ipv4_mapped if !ipv4? raise InvalidAddressError, "not an IPv4 address" end return self.clone.set(@addr \| 0xffff00000000, Socket::AF_INET6) end # Returns a new ipaddr built by converting the native IPv4 address # into an IPv4-compatible IPv6 address. def ipv4_compat if !ipv4? raise InvalidAddressError, "not an IPv4 address" end return self.clone.set(@addr, Socket::AF_INET6) end # Returns a new ipaddr built by converting the IPv6 address into a # native IPv4 address. If the IP address is not an IPv4-mapped or # IPv4-compatible IPv6 address, returns self. def native if !ipv4_mapped? && !ipv4_compat? return self end return self.clone.set(@addr & IN4MASK, Socket::AF_INET) end # Returns a string for DNS reverse lookup. It returns a string in # RFC3172 form for an IPv6 address. def reverse case @family when Socket::AF_INET return _reverse + ".in-addr.arpa" when Socket::AF_INET6 return ip6_arpa else raise AddressFamilyError, "unsupported address family" end end # Returns a string for DNS reverse lookup compatible with RFC3172. def ip6_arpa if !ipv6? raise InvalidAddressError, "not an IPv6 address" end return _reverse + ".ip6.arpa" end # Returns a string for DNS reverse lookup compatible with RFC1886. def ip6_int if !ipv6? raise InvalidAddressError, "not an IPv6 address" end return _reverse + ".ip6.int" end # Returns the successor to the ipaddr. def succ return self.clone.set(@addr + 1, @family) end # Compares the ipaddr with another. def <=>(other) other = coerce_other(other) return nil if other.family != @family return @addr <=> other.to_i end include Comparable # Checks equality used by Hash. def eql?(other) return self.class == other.class && self.hash == other.hash && self == other end # Returns a hash value used by Hash, Set, and Array classes def hash return ([@addr, @mask_addr].hash << 1) \| (ipv4? ? 0 : 1) end # Creates a Range object for the network address. def to_range begin_addr = (@addr & @mask_addr) case @family when Socket::AF_INET end_addr = (@addr \| (IN4MASK ^ @mask_addr)) when Socket::AF_INET6 end_addr = (@addr \| (IN6MASK ^ @mask_addr)) else raise AddressFamilyError, "unsupported address family" end return clone.set(begin_addr, @family)..clone.set(end_addr, @family) end # Returns a string containing a human-readable representation of the # ipaddr. ("#<IPAddr: family:address/mask>") def inspect case @family when Socket::AF_INET af = "IPv4" when Socket::AF_INET6 af = "IPv6" else raise AddressFamilyError, "unsupported address family" end return sprintf("#<%s: %s:%s/%s>", self.class.name, af, _to_string(@addr), _to_string(@mask_addr)) end protected # Set +@addr+, the internal stored ip address, to given +addr+. The # parameter +addr+ is validated using the first +family+ member, # which is +Socket::AF_INET+ or +Socket::AF_INET6+. def set(addr, family) case family[0] ? family[0] : @family when Socket::AF_INET if addr < 0 \|\| addr > IN4MASK raise InvalidAddressError, "invalid address" end when Socket::AF_INET6 if addr < 0 \|\| addr > IN6MASK raise InvalidAddressError, "invalid address" end else raise AddressFamilyError, "unsupported address family" end @addr = addr if family[0] @family = family[0] end return self end # Set current netmask to given mask. def mask!(mask) if mask.kind_of?(String) if mask =~ /\A\d+\z/ prefixlen = mask.to_i else m = IPAddr.new(mask) if m.family != @family raise InvalidPrefixError, "address family is not same" end @mask_addr = m.to_i @addr &= @mask_addr return self end else prefixlen = mask end case @family when Socket::AF_INET if prefixlen < 0 \|\| prefixlen > 32 raise InvalidPrefixError, "invalid length" end masklen = 32 - prefixlen @mask_addr = ((IN4MASK >> masklen) << masklen) when Socket::AF_INET6 if prefixlen < 0 \|\| prefixlen > 128 raise InvalidPrefixError, "invalid length" end masklen = 128 - prefixlen @mask_addr = ((IN6MASK >> masklen) << masklen) else raise AddressFamilyError, "unsupported address family" end @addr = ((@addr >> masklen) << masklen) return self end private # Creates a new ipaddr object either from a human readable IP # address representation in string, or from a packed in_addr value # followed by an address family. # # In the former case, the following are the valid formats that will # be recognized: "address", "address/prefixlen" and "address/mask", # where IPv6 address may be enclosed in square brackets (`[' and # `]'). If a prefixlen or a mask is specified, it returns a masked # IP address. Although the address family is determined # automatically from a specified string, you can specify one # explicitly by the optional second argument. # # Otherwise an IP address is generated from a packed in_addr value # and an address family. # # The IPAddr class defines many methods and operators, and some of # those, such as &, \|, include? and ==, accept a string, or a packed # in_addr value instead of an IPAddr object. def initialize(addr = '::', family = Socket::AF_UNSPEC) if !addr.kind_of?(String) case family when Socket::AF_INET, Socket::AF_INET6 set(addr.to_i, family) @mask_addr = (family == Socket::AF_INET) ? IN4MASK : IN6MASK return when Socket::AF_UNSPEC raise AddressFamilyError, "address family must be specified" else raise AddressFamilyError, "unsupported address family: #{family}" end end prefix, prefixlen = addr.split('/') if prefix =~ /\A\[(.)\]\z/i prefix = $1 family = Socket::AF_INET6 end # It seems AI_NUMERICHOST doesn't do the job. #Socket.getaddrinfo(left, nil, Socket::AF_INET6, Socket::SOCK_STREAM, nil, # Socket::AI_NUMERICHOST) @addr = @family = nil if family == Socket::AF_UNSPEC \|\| family == Socket::AF_INET @addr = in_addr(prefix) if @addr @family = Socket::AF_INET end end if !@addr && (family == Socket::AF_UNSPEC \|\| family == Socket::AF_INET6) @addr = in6_addr(prefix) @family = Socket::AF_INET6 end if family != Socket::AF_UNSPEC && @family != family raise AddressFamilyError, "address family mismatch" end if prefixlen mask!(prefixlen) else @mask_addr = (@family == Socket::AF_INET) ? IN4MASK : IN6MASK end end def coerce_other(other) case other when IPAddr other when String self.class.new(other) else self.class.new(other, @family) end end def in_addr(addr) case addr when Array octets = addr else m = RE_IPV4ADDRLIKE.match(addr) or return nil octets = m.captures end octets.inject(0) { \|i, s\| (n = s.to_i) < 256 or raise InvalidAddressError, "invalid address" s.match(/\A0./) and raise InvalidAddressError, "zero-filled number in IPv4 address is ambiguous" i << 8 \| n } end def in6_addr(left) case left when RE_IPV6ADDRLIKE_FULL if $2 addr = in_addr($~[2,4]) left = $1 + ':' else addr = 0 end right = '' when RE_IPV6ADDRLIKE_COMPRESSED if $4 left.count(':') <= 6 or raise InvalidAddressError, "invalid address" addr = in_addr($~[4,4]) left = $1 right = $3 + '0:0' else left.count(':') <= ($1.empty? \|\| $2.empty? ? 8 : 7) or raise InvalidAddressError, "invalid address" left = $1 right = $2 addr = 0 end else raise InvalidAddressError, "invalid address" end l = left.split(':') r = right.split(':') rest = 8 - l.size - r.size if rest < 0 return nil end (l + Array.new(rest, '0') + r).inject(0) { \|i, s\| i << 16 \| s.hex } \| addr end def addr_mask(addr) case @family when Socket::AF_INET return addr & IN4MASK when Socket::AF_INET6 return addr & IN6MASK else raise AddressFamilyError, "unsupported address family" end end def _reverse case @family when Socket::AF_INET return (0..3).map { \|i\| (@addr >> (8 * i)) & 0xff }.join('.') when Socket::AF_INET6 return ("%.32x" % @addr).reverse!.gsub!(/.(?!$)/, '\&.') else raise AddressFamilyError, "unsupported address family" end end def _to_string(addr) case @family when Socket::AF_INET return (0..3).map { \|i\| (addr >> (24 - 8 * i)) & 0xff }.join('.') when Socket::AF_INET6 return (("%.32x" % addr).gsub!(/.{4}(?!$)/, '\&:')) else raise AddressFamilyError, "unsupported address family" end end end unless Socket.const_defined? :AF_INET6 class Socket < BasicSocket # IPv6 protocol family AF_INET6 = Object.new end class << IPSocket private def valid_v6?(addr) case addr when IPAddr::RE_IPV6ADDRLIKE_FULL if $2 $~[2,4].all? {\|i\| i.to_i < 256 } else true end when IPAddr::RE_IPV6ADDRLIKE_COMPRESSED if $4 addr.count(':') <= 6 && $~[4,4].all? {\|i\| i.to_i < 256} else addr.count(':') <= 7 end else false end end alias getaddress_orig getaddress public # Returns a +String+ based representation of a valid DNS hostname, # IPv4 or IPv6 address. # # IPSocket.getaddress 'localhost' #=> "::1" # IPSocket.getaddress 'broadcasthost' #=> "255.255.255.255" # IPSocket.getaddress 'www.ruby-lang.org' #=> "221.186.184.68" # IPSocket.getaddress 'www.ccc.de' #=> "2a00:1328:e102:ccc0::122" def getaddress(s) if valid_v6?(s) s else getaddress_orig(s) end end end end Back

Edit File : ipaddr.rb | Size : 17.05 KB

#
# ipaddr.rb - A class to manipulate an IP address
#
# Copyright (c) 2002 Hajimu UMEMOTO <ume@mahoroba.org>.
# Copyright (c) 2007, 2009, 2012 Akinori MUSHA <knu@iDaemons.org>.
# All rights reserved.
#
# You can redistribute and/or modify it under the same terms as Ruby.
#
# $Id: ipaddr.rb 52360 2015-10-29 14:36:05Z usa $
#
# Contact:
#   - Akinori MUSHA <knu@iDaemons.org> (current maintainer)
#
# TODO:
#   - scope_id support
#
require 'socket'

# IPAddr provides a set of methods to manipulate an IP address.  Both IPv4 and
# IPv6 are supported.
#
# == Example
#
#   require 'ipaddr'
#
#   ipaddr1 = IPAddr.new "3ffe:505:2::1"
#
#   p ipaddr1                   #=> #<IPAddr: IPv6:3ffe:0505:0002:0000:0000:0000:0000:0001/ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff>
#
#   p ipaddr1.to_s              #=> "3ffe:505:2::1"
#
#   ipaddr2 = ipaddr1.mask(48)  #=> #<IPAddr: IPv6:3ffe:0505:0002:0000:0000:0000:0000:0000/ffff:ffff:ffff:0000:0000:0000:0000:0000>
#
#   p ipaddr2.to_s              #=> "3ffe:505:2::"
#
#   ipaddr3 = IPAddr.new "192.168.2.0/24"
#
#   p ipaddr3                   #=> #<IPAddr: IPv4:192.168.2.0/255.255.255.0>

class IPAddr

# 32 bit mask for IPv4
  IN4MASK = 0xffffffff
  # 128 bit mask for IPv4
  IN6MASK = 0xffffffffffffffffffffffffffffffff
  # Format string for IPv6
  IN6FORMAT = (["%.4x"] * 8).join(':')

# Regexp _internally_ used for parsing IPv4 address.
  RE_IPV4ADDRLIKE = %r{
    \A
    (\d+) \. (\d+) \. (\d+) \. (\d+)
    \z
  }x

# Regexp _internally_ used for parsing IPv6 address.
  RE_IPV6ADDRLIKE_FULL = %r{
    \A
    (?:
      (?: [\da-f]{1,4} : ){7} [\da-f]{1,4}
    |
      ( (?: [\da-f]{1,4} : ){6} )
      (\d+) \. (\d+) \. (\d+) \. (\d+)
    )
    \z
  }xi

# Regexp _internally_ used for parsing IPv6 address.
  RE_IPV6ADDRLIKE_COMPRESSED = %r{
    \A
    ( (?: (?: [\da-f]{1,4} : )* [\da-f]{1,4} )? )
    ::
    ( (?:
      ( (?: [\da-f]{1,4} : )* )
      (?:
        [\da-f]{1,4}
      |
        (\d+) \. (\d+) \. (\d+) \. (\d+)
      )
    )? )
    \z
  }xi

# Generic IPAddr related error. Exceptions raised in this class should
  # inherit from Error.
  class Error < ArgumentError; end

# Raised when the provided IP address is an invalid address.
  class InvalidAddressError < Error; end

# Raised when the address family is invalid such as an address with an
  # unsupported family, an address with an inconsistent family, or an address
  # who's family cannot be determined.
  class AddressFamilyError < Error; end

# Raised when the address is an invalid length.
  class InvalidPrefixError < InvalidAddressError; end

# Returns the address family of this IP address.
  attr_reader :family

# Creates a new ipaddr containing the given network byte ordered
  # string form of an IP address.
  def IPAddr::new_ntoh(addr)
    return IPAddr.new(IPAddr::ntop(addr))
  end

# Convert a network byte ordered string form of an IP address into
  # human readable form.
  def IPAddr::ntop(addr)
    case addr.size
    when 4
      s = addr.unpack('C4').join('.')
    when 16
      s = IN6FORMAT % addr.unpack('n8')
    else
      raise AddressFamilyError, "unsupported address family"
    end
    return s
  end

# Returns a new ipaddr built by bitwise AND.
  def &(other)
    return self.clone.set(@addr & coerce_other(other).to_i)
  end

# Returns a new ipaddr built by bitwise OR.
  def |(other)
    return self.clone.set(@addr | coerce_other(other).to_i)
  end

# Returns a new ipaddr built by bitwise right-shift.
  def >>(num)
    return self.clone.set(@addr >> num)
  end

# Returns a new ipaddr built by bitwise left shift.
  def <<(num)
    return self.clone.set(addr_mask(@addr << num))
  end

# Returns a new ipaddr built by bitwise negation.
  def ~
    return self.clone.set(addr_mask(~@addr))
  end

# Returns true if two ipaddrs are equal.
  def ==(other)
    other = coerce_other(other)
    return @family == other.family && @addr == other.to_i
  end

# Returns a new ipaddr built by masking IP address with the given
  # prefixlen/netmask. (e.g. 8, 64, "255.255.255.0", etc.)
  def mask(prefixlen)
    return self.clone.mask!(prefixlen)
  end

# Returns true if the given ipaddr is in the range.
  #
  # e.g.:
  #   require 'ipaddr'
  #   net1 = IPAddr.new("192.168.2.0/24")
  #   net2 = IPAddr.new("192.168.2.100")
  #   net3 = IPAddr.new("192.168.3.0")
  #   p net1.include?(net2)     #=> true
  #   p net1.include?(net3)     #=> false
  def include?(other)
    other = coerce_other(other)
    if ipv4_mapped?
      if (@mask_addr >> 32) != 0xffffffffffffffffffffffff
        return false
      end
      mask_addr = (@mask_addr & IN4MASK)
      addr = (@addr & IN4MASK)
      family = Socket::AF_INET
    else
      mask_addr = @mask_addr
      addr = @addr
      family = @family
    end
    if other.ipv4_mapped?
      other_addr = (other.to_i & IN4MASK)
      other_family = Socket::AF_INET
    else
      other_addr = other.to_i
      other_family = other.family
    end

if family != other_family
      return false
    end
    return ((addr & mask_addr) == (other_addr & mask_addr))
  end
  alias === include?

# Returns the integer representation of the ipaddr.
  def to_i
    return @addr
  end

# Returns a string containing the IP address representation.
  def to_s
    str = to_string
    return str if ipv4?

str.gsub!(/\b0{1,3}([\da-f]+)\b/i, '\1')
    loop do
      break if str.sub!(/\A0:0:0:0:0:0:0:0\z/, '::')
      break if str.sub!(/\b0:0:0:0:0:0:0\b/, ':')
      break if str.sub!(/\b0:0:0:0:0:0\b/, ':')
      break if str.sub!(/\b0:0:0:0:0\b/, ':')
      break if str.sub!(/\b0:0:0:0\b/, ':')
      break if str.sub!(/\b0:0:0\b/, ':')
      break if str.sub!(/\b0:0\b/, ':')
      break
    end
    str.sub!(/:{3,}/, '::')

if /\A::(ffff:)?([\da-f]{1,4}):([\da-f]{1,4})\z/i =~ str
      str = sprintf('::%s%d.%d.%d.%d', $1, $2.hex / 256, $2.hex % 256, $3.hex / 256, $3.hex % 256)
    end

str
  end

# Returns a string containing the IP address representation in
  # canonical form.
  def to_string
    return _to_string(@addr)
  end

# Returns a network byte ordered string form of the IP address.
  def hton
    case @family
    when Socket::AF_INET
      return [@addr].pack('N')
    when Socket::AF_INET6
      return (0..7).map { |i|
        (@addr >> (112 - 16 * i)) & 0xffff
      }.pack('n8')
    else
      raise AddressFamilyError, "unsupported address family"
    end
  end

# Returns true if the ipaddr is an IPv4 address.
  def ipv4?
    return @family == Socket::AF_INET
  end

# Returns true if the ipaddr is an IPv6 address.
  def ipv6?
    return @family == Socket::AF_INET6
  end

# Returns true if the ipaddr is an IPv4-mapped IPv6 address.
  def ipv4_mapped?
    return ipv6? && (@addr >> 32) == 0xffff
  end

# Returns true if the ipaddr is an IPv4-compatible IPv6 address.
  def ipv4_compat?
    if !ipv6? || (@addr >> 32) != 0
      return false
    end
    a = (@addr & IN4MASK)
    return a != 0 && a != 1
  end

# Returns a new ipaddr built by converting the native IPv4 address
  # into an IPv4-mapped IPv6 address.
  def ipv4_mapped
    if !ipv4?
      raise InvalidAddressError, "not an IPv4 address"
    end
    return self.clone.set(@addr | 0xffff00000000, Socket::AF_INET6)
  end

# Returns a new ipaddr built by converting the native IPv4 address
  # into an IPv4-compatible IPv6 address.
  def ipv4_compat
    if !ipv4?
      raise InvalidAddressError, "not an IPv4 address"
    end
    return self.clone.set(@addr, Socket::AF_INET6)
  end

# Returns a new ipaddr built by converting the IPv6 address into a
  # native IPv4 address.  If the IP address is not an IPv4-mapped or
  # IPv4-compatible IPv6 address, returns self.
  def native
    if !ipv4_mapped? && !ipv4_compat?
      return self
    end
    return self.clone.set(@addr & IN4MASK, Socket::AF_INET)
  end

# Returns a string for DNS reverse lookup.  It returns a string in
  # RFC3172 form for an IPv6 address.
  def reverse
    case @family
    when Socket::AF_INET
      return _reverse + ".in-addr.arpa"
    when Socket::AF_INET6
      return ip6_arpa
    else
      raise AddressFamilyError, "unsupported address family"
    end
  end

# Returns a string for DNS reverse lookup compatible with RFC3172.
  def ip6_arpa
    if !ipv6?
      raise InvalidAddressError, "not an IPv6 address"
    end
    return _reverse + ".ip6.arpa"
  end

# Returns a string for DNS reverse lookup compatible with RFC1886.
  def ip6_int
    if !ipv6?
      raise InvalidAddressError, "not an IPv6 address"
    end
    return _reverse + ".ip6.int"
  end

# Returns the successor to the ipaddr.
  def succ
    return self.clone.set(@addr + 1, @family)
  end

# Compares the ipaddr with another.
  def <=>(other)
    other = coerce_other(other)

return nil if other.family != @family

return @addr <=> other.to_i
  end
  include Comparable

# Checks equality used by Hash.
  def eql?(other)
    return self.class == other.class && self.hash == other.hash && self == other
  end

# Returns a hash value used by Hash, Set, and Array classes
  def hash
    return ([@addr, @mask_addr].hash << 1) | (ipv4? ? 0 : 1)
  end

# Creates a Range object for the network address.
  def to_range
    begin_addr = (@addr & @mask_addr)

case @family
    when Socket::AF_INET
      end_addr = (@addr | (IN4MASK ^ @mask_addr))
    when Socket::AF_INET6
      end_addr = (@addr | (IN6MASK ^ @mask_addr))
    else
      raise AddressFamilyError, "unsupported address family"
    end

return clone.set(begin_addr, @family)..clone.set(end_addr, @family)
  end

# Returns a string containing a human-readable representation of the
  # ipaddr. ("#<IPAddr: family:address/mask>")
  def inspect
    case @family
    when Socket::AF_INET
      af = "IPv4"
    when Socket::AF_INET6
      af = "IPv6"
    else
      raise AddressFamilyError, "unsupported address family"
    end
    return sprintf("#<%s: %s:%s/%s>", self.class.name,
                   af, _to_string(@addr), _to_string(@mask_addr))
  end

protected

# Set +@addr+, the internal stored ip address, to given +addr+. The
  # parameter +addr+ is validated using the first +family+ member,
  # which is +Socket::AF_INET+ or +Socket::AF_INET6+.
  def set(addr, *family)
    case family[0] ? family[0] : @family
    when Socket::AF_INET
      if addr < 0 || addr > IN4MASK
        raise InvalidAddressError, "invalid address"
      end
    when Socket::AF_INET6
      if addr < 0 || addr > IN6MASK
        raise InvalidAddressError, "invalid address"
      end
    else
      raise AddressFamilyError, "unsupported address family"
    end
    @addr = addr
    if family[0]
      @family = family[0]
    end
    return self
  end

# Set current netmask to given mask.
  def mask!(mask)
    if mask.kind_of?(String)
      if mask =~ /\A\d+\z/
        prefixlen = mask.to_i
      else
        m = IPAddr.new(mask)
        if m.family != @family
          raise InvalidPrefixError, "address family is not same"
        end
        @mask_addr = m.to_i
        @addr &= @mask_addr
        return self
      end
    else
      prefixlen = mask
    end
    case @family
    when Socket::AF_INET
      if prefixlen < 0 || prefixlen > 32
        raise InvalidPrefixError, "invalid length"
      end
      masklen = 32 - prefixlen
      @mask_addr = ((IN4MASK >> masklen) << masklen)
    when Socket::AF_INET6
      if prefixlen < 0 || prefixlen > 128
        raise InvalidPrefixError, "invalid length"
      end
      masklen = 128 - prefixlen
      @mask_addr = ((IN6MASK >> masklen) << masklen)
    else
      raise AddressFamilyError, "unsupported address family"
    end
    @addr = ((@addr >> masklen) << masklen)
    return self
  end

private

# Creates a new ipaddr object either from a human readable IP
  # address representation in string, or from a packed in_addr value
  # followed by an address family.
  #
  # In the former case, the following are the valid formats that will
  # be recognized: "address", "address/prefixlen" and "address/mask",
  # where IPv6 address may be enclosed in square brackets (`[' and
  # `]').  If a prefixlen or a mask is specified, it returns a masked
  # IP address.  Although the address family is determined
  # automatically from a specified string, you can specify one
  # explicitly by the optional second argument.
  #
  # Otherwise an IP address is generated from a packed in_addr value
  # and an address family.
  #
  # The IPAddr class defines many methods and operators, and some of
  # those, such as &, |, include? and ==, accept a string, or a packed
  # in_addr value instead of an IPAddr object.
  def initialize(addr = '::', family = Socket::AF_UNSPEC)
    if !addr.kind_of?(String)
      case family
      when Socket::AF_INET, Socket::AF_INET6
        set(addr.to_i, family)
        @mask_addr = (family == Socket::AF_INET) ? IN4MASK : IN6MASK
        return
      when Socket::AF_UNSPEC
        raise AddressFamilyError, "address family must be specified"
      else
        raise AddressFamilyError, "unsupported address family: #{family}"
      end
    end
    prefix, prefixlen = addr.split('/')
    if prefix =~ /\A\[(.*)\]\z/i
      prefix = $1
      family = Socket::AF_INET6
    end
    # It seems AI_NUMERICHOST doesn't do the job.
    #Socket.getaddrinfo(left, nil, Socket::AF_INET6, Socket::SOCK_STREAM, nil,
    #                  Socket::AI_NUMERICHOST)
    @addr = @family = nil
    if family == Socket::AF_UNSPEC || family == Socket::AF_INET
      @addr = in_addr(prefix)
      if @addr
        @family = Socket::AF_INET
      end
    end
    if !@addr && (family == Socket::AF_UNSPEC || family == Socket::AF_INET6)
      @addr = in6_addr(prefix)
      @family = Socket::AF_INET6
    end
    if family != Socket::AF_UNSPEC && @family != family
      raise AddressFamilyError, "address family mismatch"
    end
    if prefixlen
      mask!(prefixlen)
    else
      @mask_addr = (@family == Socket::AF_INET) ? IN4MASK : IN6MASK
    end
  end

def coerce_other(other)
    case other
    when IPAddr
      other
    when String
      self.class.new(other)
    else
      self.class.new(other, @family)
    end
  end

def in_addr(addr)
    case addr
    when Array
      octets = addr
    else
      m = RE_IPV4ADDRLIKE.match(addr) or return nil
      octets = m.captures
    end
    octets.inject(0) { |i, s|
      (n = s.to_i) < 256 or raise InvalidAddressError, "invalid address"
      s.match(/\A0./) and raise InvalidAddressError, "zero-filled number in IPv4 address is ambiguous"
      i << 8 | n
    }
  end

def in6_addr(left)
    case left
    when RE_IPV6ADDRLIKE_FULL
      if $2
        addr = in_addr($~[2,4])
        left = $1 + ':'
      else
        addr = 0
      end
      right = ''
    when RE_IPV6ADDRLIKE_COMPRESSED
      if $4
        left.count(':') <= 6 or raise InvalidAddressError, "invalid address"
        addr = in_addr($~[4,4])
        left = $1
        right = $3 + '0:0'
      else
        left.count(':') <= ($1.empty? || $2.empty? ? 8 : 7) or
          raise InvalidAddressError, "invalid address"
        left = $1
        right = $2
        addr = 0
      end
    else
      raise InvalidAddressError, "invalid address"
    end
    l = left.split(':')
    r = right.split(':')
    rest = 8 - l.size - r.size
    if rest < 0
      return nil
    end
    (l + Array.new(rest, '0') + r).inject(0) { |i, s|
      i << 16 | s.hex
    } | addr
  end

def addr_mask(addr)
    case @family
    when Socket::AF_INET
      return addr & IN4MASK
    when Socket::AF_INET6
      return addr & IN6MASK
    else
      raise AddressFamilyError, "unsupported address family"
    end
  end

def _reverse
    case @family
    when Socket::AF_INET
      return (0..3).map { |i|
        (@addr >> (8 * i)) & 0xff
      }.join('.')
    when Socket::AF_INET6
      return ("%.32x" % @addr).reverse!.gsub!(/.(?!$)/, '\&.')
    else
      raise AddressFamilyError, "unsupported address family"
    end
  end

def _to_string(addr)
    case @family
    when Socket::AF_INET
      return (0..3).map { |i|
        (addr >> (24 - 8 * i)) & 0xff
      }.join('.')
    when Socket::AF_INET6
      return (("%.32x" % addr).gsub!(/.{4}(?!$)/, '\&:'))
    else
      raise AddressFamilyError, "unsupported address family"
    end
  end

end

unless Socket.const_defined? :AF_INET6
  class Socket < BasicSocket
    # IPv6 protocol family
    AF_INET6 = Object.new
  end

class << IPSocket
    private

def valid_v6?(addr)
      case addr
      when IPAddr::RE_IPV6ADDRLIKE_FULL
        if $2
          $~[2,4].all? {|i| i.to_i < 256 }
        else
          true
        end
      when IPAddr::RE_IPV6ADDRLIKE_COMPRESSED
        if $4
          addr.count(':') <= 6 && $~[4,4].all? {|i| i.to_i < 256}
        else
          addr.count(':') <= 7
        end
      else
        false
      end
    end

alias getaddress_orig getaddress

public

# Returns a +String+ based representation of a valid DNS hostname,
    # IPv4 or IPv6 address.
    #
    #   IPSocket.getaddress 'localhost'         #=> "::1"
    #   IPSocket.getaddress 'broadcasthost'     #=> "255.255.255.255"
    #   IPSocket.getaddress 'www.ruby-lang.org' #=> "221.186.184.68"
    #   IPSocket.getaddress 'www.ccc.de'        #=> "2a00:1328:e102:ccc0::122"
    def getaddress(s)
      if valid_v6?(s)
        s
      else
        getaddress_orig(s)
      end
    end
  end
end

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