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# $Id: ipv6.rb,v 1.12 2003/07/25 22:51:24 sdalu Exp $
#
# AUTHOR : Stephane D'Alu <sdalu@nic.fr>
# CREATED : 2002/07/19 07:28:13
#
# COPYRIGHT: AFNIC (c) 2003
# LICENSE : RUBY
# CONTACT :
#
# $Revision: 1.12 $
# $Date: 2003/07/25 22:51:24 $
#
# INSPIRED BY:
# - the ruby file: resolv.rb
#
# CONTRIBUTORS: (see also CREDITS file)
#
#
require 'socket'
require 'address/common'
require 'address/ipv4'
class Address
##
## IPv6 address
##
class IPv6 < Address
private
Regex_8Hex = /\A
(?:[0-9A-Fa-f]{1,4}:){7}
[0-9A-Fa-f]{1,4}
\z/x
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
Regex_6Hex4Dec = /\A
((?:[0-9A-Fa-f]{1,4}:){6,6})
(\d+)\.(\d+)\.(\d+)\.(\d+)
\z/x
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
Regex_4Dec = /\A
(\d+)\.(\d+)\.(\d+)\.(\d+)
\z/x
public
IPv6Regex = /
(?:#{Regex_8Hex.source}) |
(?:#{Regex_CompressedHex.source}) |
(?:#{Regex_6Hex4Dec.source}) |
(?:#{Regex_CompressedHex4Dec.source})
/x
IPv6StrictRegex = /
(?:#{Regex_8Hex.source}) |
(?:#{Regex_CompressedHex.source})
/x
IPv6LooseRegex = /
(?:#{Regex_8Hex.source}) |
(?:#{Regex_CompressedHex.source}) |
(?:#{Regex_6Hex4Dec.source}) |
(?:#{Regex_CompressedHex4Dec.source}) |
(?:#{Regex_4Dec.source})
/x
Regex = IPv6Regex
def self.hex_pack(str, data='')
str.scan(/[0-9A-Fa-f]+/) { |hex| data << [hex.hex].pack('n') }
data
end
def self.is_valid(str, opt=Regex)
str =~ opt
end
def self.create(arg, opt=Regex)
case arg
when IPv6
return arg
when IPv4
return self.create("::ffff:#{arg.to_s}")
when String
address = ''
# According to the option, select the test that
# should be performed
test = if opt == IPv6StrictRegex then 1
elsif opt == IPv6Regex then 2
elsif opt == IPv6LooseRegex then 3
else raise ArgumentError, 'unknown option'
end
# Test: a:b:c:d:e:f:g:h
if (test >= 1) && Regex_8Hex =~ arg
hex_pack(arg, address)
# Test: a:b:c::d:e:f
elsif (test >= 1) && Regex_CompressedHex =~ arg
prefix, suffix = $1, $2
a1 = hex_pack(prefix)
a2 = hex_pack(suffix)
omitlen = 16 - a1.length - a2.length
address << a1 << "\0" * omitlen << a2
# Test: a:b:c:d:e:f:g.h.i.j
elsif (test >= 2) && 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
hex_pack(prefix, address)
address << [a, b, c, d].pack('CCCC')
end
# Test: a::b:c:d.e.f.g
elsif (test >= 2) && 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 = hex_pack(prefix)
a2 = hex_pack(suffix)
omitlen = 12 - a1.length - a2.length
address << a1 << "\0" * omitlen << a2 << [a, b, c, d].pack('CCCC')
end
# Test: a.b.c.d
elsif (test >= 3) && Regex_4Dec =~ arg
a, b, c, d = $1.to_i, $2.to_i, $3.to_i, $4.to_i
if (0..255) === a && (0..255) === b &&
(0..255) === c && (0..255) === d
address << "\0" * 10 << "\377" * 2 << [a, b, c, d].pack('CCCC')
end
end
# Check if conversion succed
if address.length != 16
raise InvalidAddress,
"IPv6 address with invalid value: #{arg}"
end
# Return new address
return IPv6::new(address.untaint.freeze)
else
raise InvalidAddress,
"can't interprete as IPv6 address: #{arg.inspect}"
end
end
def initialize(address)
unless (address.instance_of?(String) &&
address.length == 16 && address.frozen?)
raise Argument,
'IPv6 raw address must be a 16 byte frozen string'
end
@address = address
freeze
end
def private?
return false
end
def prefix(size=nil)
if size.nil?
prefix(64)
else
if size > @address.size * 8
raise ArgumentError, 'prefix size too big'
end
bytes, bits_shift = size / 8, 8 - (size % 8)
address = @address.slice(0, bytes) +
("\0" * (@address.size - bytes))
address[bytes] = (@address[bytes] >> bits_shift) << bits_shift
IPv6::new(address.freeze)
end
end
def to_s
address = '%X:%X:%X:%X:%X:%X:%X:%X' % @address.unpack('nnnnnnnn')
unless address.sub!(/(^|:)0(:0)+(:|$)/, '::')
address.sub!(/(^|:)0(:|$)/, '::')
end
address
end
def to_dnsform
@address.unpack('H32')[0].split(//).reverse.join('.')
end
def protocol ; Socket::AF_INET6 ; end
def namespace ; 'ip6.arpa.' ; end
##
## IPv6 address
## (allow creation of IPv4 mapped address by default)
##
class Compatibility < IPv6
def self.create(arg, opt=IPv6LooseRegex)
IPv6::create(arg, opt)
end
end
##
## IPv6 Loopback
##
Loopback = IPv6::create('::1')
end
end
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