# frozen_string_literal: false

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#

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# ipaddr.rb - A class to manipulate an IP address

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#

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# Copyright (c) 2002 Hajimu UMEMOTO <ume@mahoroba.org>.

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# Copyright (c) 2007, 2009, 2012 Akinori MUSHA <knu@iDaemons.org>.

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# All rights reserved.

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#

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# You can redistribute and/or modify it under the same terms as Ruby.

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#

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# $Id: ipaddr.rb 61155 2017-12-12 11:56:25Z shyouhei $

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#

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# Contact:

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# - Akinori MUSHA <knu@iDaemons.org> (current maintainer)

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#

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# TODO:

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# - scope_id support

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#

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require 'socket'

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# IPAddr provides a set of methods to manipulate an IP address. Both IPv4 and

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# IPv6 are supported.

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#

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# == Example

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#

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# require 'ipaddr'

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#

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# ipaddr1 = IPAddr.new "3ffe:505:2::1"

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#

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# p ipaddr1 #=> #<IPAddr: IPv6:3ffe:0505:0002:0000:0000:0000:0000:0001/ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff>

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#

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# p ipaddr1.to_s #=> "3ffe:505:2::1"

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#

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# ipaddr2 = ipaddr1.mask(48) #=> #<IPAddr: IPv6:3ffe:0505:0002:0000:0000:0000:0000:0000/ffff:ffff:ffff:0000:0000:0000:0000:0000>

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#

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# p ipaddr2.to_s #=> "3ffe:505:2::"

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#

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# ipaddr3 = IPAddr.new "192.168.2.0/24"

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#

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# p ipaddr3 #=> #<IPAddr: IPv4:192.168.2.0/255.255.255.0>

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class IPAddr

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# 32 bit mask for IPv4

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IN4MASK = 0xffffffff

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# 128 bit mask for IPv6

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IN6MASK = 0xffffffffffffffffffffffffffffffff

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# Format string for IPv6

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IN6FORMAT = (["%.4x"] * 8).join(':')

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# Regexp _internally_ used for parsing IPv4 address.

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RE_IPV4ADDRLIKE = %r{

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\A

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(\d+) \. (\d+) \. (\d+) \. (\d+)

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\z

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}x

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# Regexp _internally_ used for parsing IPv6 address.

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RE_IPV6ADDRLIKE_FULL = %r{

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\A

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(?:

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(?: [\da-f]{1,4} : ){7} [\da-f]{1,4}

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|

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( (?: [\da-f]{1,4} : ){6} )

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(\d+) \. (\d+) \. (\d+) \. (\d+)

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)

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\z

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}xi

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# Regexp _internally_ used for parsing IPv6 address.

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RE_IPV6ADDRLIKE_COMPRESSED = %r{

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\A

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( (?: (?: [\da-f]{1,4} : )* [\da-f]{1,4} )? )

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::

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( (?:

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( (?: [\da-f]{1,4} : )* )

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(?:

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[\da-f]{1,4}

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|

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(\d+) \. (\d+) \. (\d+) \. (\d+)

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)

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)? )

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\z

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}xi

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# Generic IPAddr related error. Exceptions raised in this class should

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# inherit from Error.

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class Error < ArgumentError; end

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# Raised when the provided IP address is an invalid address.

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class InvalidAddressError < Error; end

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# Raised when the address family is invalid such as an address with an

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# unsupported family, an address with an inconsistent family, or an address

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# who's family cannot be determined.

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class AddressFamilyError < Error; end

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# Raised when the address is an invalid length.

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class InvalidPrefixError < InvalidAddressError; end

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# Returns the address family of this IP address.

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attr_reader :family

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# Creates a new ipaddr containing the given network byte ordered

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# string form of an IP address.

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def IPAddr::new_ntoh(addr)

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return IPAddr.new(IPAddr::ntop(addr))

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end

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# Convert a network byte ordered string form of an IP address into

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# human readable form.

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def IPAddr::ntop(addr)

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case addr.size

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when 4

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s = addr.unpack('C4').join('.')

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when 16

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s = IN6FORMAT % addr.unpack('n8')

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else

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raise AddressFamilyError, "unsupported address family"

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end

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return s

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end

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# Returns a new ipaddr built by bitwise AND.

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def &(other)

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return self.clone.set(@addr & coerce_other(other).to_i)

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end

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# Returns a new ipaddr built by bitwise OR.

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def |(other)

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return self.clone.set(@addr | coerce_other(other).to_i)

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end

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# Returns a new ipaddr built by bitwise right-shift.

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def >>(num)

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return self.clone.set(@addr >> num)

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end

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# Returns a new ipaddr built by bitwise left shift.

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def <<(num)

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return self.clone.set(addr_mask(@addr << num))

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end

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# Returns a new ipaddr built by bitwise negation.

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def ~

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return self.clone.set(addr_mask(~@addr))

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end

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# Returns true if two ipaddrs are equal.

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def ==(other)

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other = coerce_other(other)

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rescue

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false

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else

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@family == other.family && @addr == other.to_i

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end

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# Returns a new ipaddr built by masking IP address with the given

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# prefixlen/netmask. (e.g. 8, 64, "255.255.255.0", etc.)

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def mask(prefixlen)

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return self.clone.mask!(prefixlen)

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end

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# Returns true if the given ipaddr is in the range.

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#

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# e.g.:

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# require 'ipaddr'

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# net1 = IPAddr.new("192.168.2.0/24")

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# net2 = IPAddr.new("192.168.2.100")

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# net3 = IPAddr.new("192.168.3.0")

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# p net1.include?(net2) #=> true

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# p net1.include?(net3) #=> false

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def include?(other)

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other = coerce_other(other)

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if ipv4_mapped?

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if (@mask_addr >> 32) != 0xffffffffffffffffffffffff

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return false

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end

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mask_addr = (@mask_addr & IN4MASK)

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addr = (@addr & IN4MASK)

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family = Socket::AF_INET

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else

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mask_addr = @mask_addr

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addr = @addr

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family = @family

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end

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if other.ipv4_mapped?

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other_addr = (other.to_i & IN4MASK)

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other_family = Socket::AF_INET

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else

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other_addr = other.to_i

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other_family = other.family

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end

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if family != other_family

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return false

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end

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return ((addr & mask_addr) == (other_addr & mask_addr))

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end

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alias === include?

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# Returns the integer representation of the ipaddr.

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def to_i

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return @addr

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end

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# Returns a string containing the IP address representation.

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def to_s

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str = to_string

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return str if ipv4?

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str.gsub!(/\b0{1,3}([\da-f]+)\b/i, '\1')

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loop do

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break if str.sub!(/\A0:0:0:0:0:0:0:0\z/, '::')

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break if str.sub!(/\b0:0:0:0:0:0:0\b/, ':')

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break if str.sub!(/\b0:0:0:0:0:0\b/, ':')

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break if str.sub!(/\b0:0:0:0:0\b/, ':')

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break if str.sub!(/\b0:0:0:0\b/, ':')

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break if str.sub!(/\b0:0:0\b/, ':')

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break if str.sub!(/\b0:0\b/, ':')

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break

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end

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str.sub!(/:{3,}/, '::')

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if /\A::(ffff:)?([\da-f]{1,4}):([\da-f]{1,4})\z/i =~ str

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str = sprintf('::%s%d.%d.%d.%d', $1, $2.hex / 256, $2.hex % 256, $3.hex / 256, $3.hex % 256)

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end

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str

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end

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# Returns a string containing the IP address representation in

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# canonical form.

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def to_string

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return _to_string(@addr)

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end

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# Returns a network byte ordered string form of the IP address.

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def hton

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case @family

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when Socket::AF_INET

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return [@addr].pack('N')

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when Socket::AF_INET6

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return (0..7).map { |i|

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(@addr >> (112 - 16 * i)) & 0xffff

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}.pack('n8')

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else

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raise AddressFamilyError, "unsupported address family"

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end

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end

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# Returns true if the ipaddr is an IPv4 address.

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def ipv4?

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return @family == Socket::AF_INET

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end

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# Returns true if the ipaddr is an IPv6 address.

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def ipv6?

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return @family == Socket::AF_INET6

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end

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# Returns true if the ipaddr is a loopback address.

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def loopback?

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case @family

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when Socket::AF_INET

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@addr & 0xff000000 == 0x7f000000

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when Socket::AF_INET6

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@addr == 1

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else

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raise AddressFamilyError, "unsupported address family"

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end

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end

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# Returns true if the ipaddr is a private address. IPv4 addresses

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# in 10.0.0.0/8, 172.16.0.0/12 and 192.168.0.0/16 as defined in RFC

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# 1918 and IPv6 Unique Local Addresses in fc00::/7 as defined in RFC

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# 4193 are considered private.

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def private?

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case @family

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when Socket::AF_INET

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@addr & 0xff000000 == 0x0a000000 || # 10.0.0.0/8

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@addr & 0xfff00000 == 0xac100000 || # 172.16.0.0/12

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@addr & 0xffff0000 == 0xc0a80000 # 192.168.0.0/16

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when Socket::AF_INET6

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@addr & 0xfe00_0000_0000_0000_0000_0000_0000_0000 == 0xfc00_0000_0000_0000_0000_0000_0000_0000

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else

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raise AddressFamilyError, "unsupported address family"

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end

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end

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# Returns true if the ipaddr is a link-local address. IPv4

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# addresses in 169.254.0.0/16 reserved by RFC 3927 and Link-Local

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# IPv6 Unicast Addresses in fe80::/10 reserved by RFC 4291 are

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# considered link-local.

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def link_local?

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case @family

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when Socket::AF_INET

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@addr & 0xffff0000 == 0xa9fe0000 # 169.254.0.0/16

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when Socket::AF_INET6

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@addr & 0xffc0_0000_0000_0000_0000_0000_0000_0000 == 0xfe80_0000_0000_0000_0000_0000_0000_0000

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else

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raise AddressFamilyError, "unsupported address family"

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end

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end

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# Returns true if the ipaddr is an IPv4-mapped IPv6 address.

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def ipv4_mapped?

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return ipv6? && (@addr >> 32) == 0xffff

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end

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# Returns true if the ipaddr is an IPv4-compatible IPv6 address.

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def ipv4_compat?

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warn "IPAddr\##{__callee__} is obsolete", uplevel: 1 if $VERBOSE

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_ipv4_compat?

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end

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def _ipv4_compat?

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if !ipv6? || (@addr >> 32) != 0

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return false

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end

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a = (@addr & IN4MASK)

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return a != 0 && a != 1

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end

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private :_ipv4_compat?

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# Returns a new ipaddr built by converting the native IPv4 address

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# into an IPv4-mapped IPv6 address.

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def ipv4_mapped

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if !ipv4?

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raise InvalidAddressError, "not an IPv4 address"

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end

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return self.clone.set(@addr | 0xffff00000000, Socket::AF_INET6)

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end

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# Returns a new ipaddr built by converting the native IPv4 address

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# into an IPv4-compatible IPv6 address.

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def ipv4_compat

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warn "IPAddr\##{__callee__} is obsolete", uplevel: 1 if $VERBOSE

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if !ipv4?

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raise InvalidAddressError, "not an IPv4 address"

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end

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return self.clone.set(@addr, Socket::AF_INET6)

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end

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# Returns a new ipaddr built by converting the IPv6 address into a

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# native IPv4 address. If the IP address is not an IPv4-mapped or

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# IPv4-compatible IPv6 address, returns self.

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def native

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if !ipv4_mapped? && !_ipv4_compat?

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return self

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end

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return self.clone.set(@addr & IN4MASK, Socket::AF_INET)

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end

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# Returns a string for DNS reverse lookup. It returns a string in

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# RFC3172 form for an IPv6 address.

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def reverse

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case @family

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when Socket::AF_INET

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return _reverse + ".in-addr.arpa"

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when Socket::AF_INET6

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return ip6_arpa

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else

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raise AddressFamilyError, "unsupported address family"

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end

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end

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# Returns a string for DNS reverse lookup compatible with RFC3172.

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def ip6_arpa

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if !ipv6?

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raise InvalidAddressError, "not an IPv6 address"

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end

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return _reverse + ".ip6.arpa"

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end

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# Returns a string for DNS reverse lookup compatible with RFC1886.

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def ip6_int

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if !ipv6?

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raise InvalidAddressError, "not an IPv6 address"

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end

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return _reverse + ".ip6.int"

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end

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# Returns the successor to the ipaddr.

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def succ

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return self.clone.set(@addr + 1, @family)

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end

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# Compares the ipaddr with another.

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def <=>(other)

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other = coerce_other(other)

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rescue

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nil

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else

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@addr <=> other.to_i if other.family == @family

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end

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include Comparable

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# Checks equality used by Hash.

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def eql?(other)

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return self.class == other.class && self.hash == other.hash && self == other

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end

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# Returns a hash value used by Hash, Set, and Array classes

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def hash

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return ([@addr, @mask_addr].hash << 1) | (ipv4? ? 0 : 1)

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end

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# Creates a Range object for the network address.

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def to_range

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begin_addr = (@addr & @mask_addr)

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case @family

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when Socket::AF_INET

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end_addr = (@addr | (IN4MASK ^ @mask_addr))

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when Socket::AF_INET6

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end_addr = (@addr | (IN6MASK ^ @mask_addr))

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else

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raise AddressFamilyError, "unsupported address family"

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end

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

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end

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# Returns the prefix length in bits for the ipaddr.

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def prefix

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case @family

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when Socket::AF_INET

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n = IN4MASK ^ @mask_addr

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i = 32

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when Socket::AF_INET6

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n = IN6MASK ^ @mask_addr

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i = 128

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else

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raise AddressFamilyError, "unsupported address family"

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end

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while n.positive?

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n >>= 1

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i -= 1

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end

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i

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end

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# Sets the prefix length in bits

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def prefix=(prefix)

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case prefix

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when Integer

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mask!(prefix)

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else

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raise InvalidPrefixError, "prefix must be an integer"

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end

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end

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# Returns a string containing a human-readable representation of the

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# ipaddr. ("#<IPAddr: family:address/mask>")

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def inspect

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case @family

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when Socket::AF_INET

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af = "IPv4"

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when Socket::AF_INET6

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af = "IPv6"

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else

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raise AddressFamilyError, "unsupported address family"

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end

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return sprintf("#<%s: %s:%s/%s>", self.class.name,

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af, _to_string(@addr), _to_string(@mask_addr))

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end

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protected

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[470] Fix | Delete

# Set +@addr+, the internal stored ip address, to given +addr+. The

[471] Fix | Delete

# parameter +addr+ is validated using the first +family+ member,

[472] Fix | Delete

# which is +Socket::AF_INET+ or +Socket::AF_INET6+.

[473] Fix | Delete

def set(addr, *family)

[474] Fix | Delete

case family[0] ? family[0] : @family

[475] Fix | Delete

when Socket::AF_INET

[476] Fix | Delete

if addr < 0 || addr > IN4MASK

[477] Fix | Delete

raise InvalidAddressError, "invalid address"

[478] Fix | Delete

end

[479] Fix | Delete

when Socket::AF_INET6

[480] Fix | Delete

if addr < 0 || addr > IN6MASK

[481] Fix | Delete

raise InvalidAddressError, "invalid address"

[482] Fix | Delete

end

[483] Fix | Delete

else

[484] Fix | Delete

raise AddressFamilyError, "unsupported address family"

[485] Fix | Delete

end

[486] Fix | Delete

@addr = addr

[487] Fix | Delete

if family[0]

[488] Fix | Delete

@family = family[0]

[489] Fix | Delete

end

[490] Fix | Delete

return self

[491] Fix | Delete

end

[492] Fix | Delete

[493] Fix | Delete

# Set current netmask to given mask.

[494] Fix | Delete

def mask!(mask)

[495] Fix | Delete

case mask

[496] Fix | Delete

when String

[497] Fix | Delete

if mask =~ /\A\d+\z/

[498] Fix | Delete

prefixlen = mask.to_i

[499] Fix | Delete