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ruby/lib/ipaddr.rb

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Ruby
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#
# ipaddr.rb - A class to manipulate an IP address
#
# Copyright (c) 2002 Hajimu UMEMOTO <ume@mahoroba.org>.
# All rights reserved.
#
# You can redistribute and/or modify it under the same terms as Ruby.
#
# $Id$
#
# TODO:
# - scope_id support
require 'socket'
unless Socket.const_defined? "AF_INET6"
class Socket
AF_INET6 = Object.new
end
class << IPSocket
def valid_v4?(addr)
if /\A(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\Z/ =~ addr
return $~.captures.all? {|i| i.to_i < 256}
end
return false
end
def valid_v6?(addr)
# IPv6 (normal)
return true if /\A[\dA-Fa-f]{1,4}(:[\dA-Fa-f]{1,4})*\Z/ =~ addr
return true if /\A[\dA-Fa-f]{1,4}(:[\dA-Fa-f]{1,4})*::([\dA-Fa-f]{1,4}(:[\dA-Fa-f]{1,4})*)?\Z/ =~ addr
return true if /\A::([\dA-Fa-f]{1,4}(:[\dA-Fa-f]{1,4})*)?\Z/ =~ addr
# IPv6 (IPv4 compat)
return true if /\A[\dA-Fa-f]{1,4}(:[\dA-Fa-f]{1,4})*:/ =~ addr && valid_v4?($')
return true if /\A[\dA-Fa-f]{1,4}(:[\dA-Fa-f]{1,4})*::([\dA-Fa-f]{1,4}(:[\dA-Fa-f]{1,4})*:)?/ =~ addr && valid_v4?($')
return true if /\A::([\dA-Fa-f]{1,4}(:[\dA-Fa-f]{1,4})*:)?/ =~ addr && valid_v4?($')
false
end
def valid?(addr)
valid_v4?(addr) || valid_v6?(addr)
end
alias getaddress_orig getaddress
def getaddress(s)
if valid?(s)
s
elsif /\A[-A-Za-z\d.]+\Z/ =~ s
getaddress_orig(s)
else
raise ArgumentError, "invalid address"
end
end
end
end
# 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
IN4MASK = 0xffffffff
IN6MASK = 0xffffffffffffffffffffffffffffffff
IN6FORMAT = (["%.4x"] * 8).join(':')
# 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 ArgumentError, "unsupported address family"
end
return s
end
# Returns a new ipaddr built by bitwise AND.
def &(other)
return self.clone.set(@addr & other.to_i)
end
# Returns a new ipaddr built by bitwise OR.
def |(other)
return self.clone.set(@addr | 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 ipaddr are equal.
def ==(other)
if other.kind_of?(IPAddr) && @family != other.family
return false
end
return (@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")
# p net1.include?(IPAddr.new("192.168.2.0")) #=> true
# p net1.include?(IPAddr.new("192.168.2.255")) #=> true
# p net1.include?(IPAddr.new("192.168.3.0")) #=> false
def include?(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.kind_of?(IPAddr)
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
else # Not IPAddr - assume integer in same family as us
other_addr = other.to_i
other_family = 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 "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 ArgumentError, "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 ArgumentError, "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 "unsupported address family"
end
end
# Returns a string for DNS reverse lookup compatible with RFC3172.
def ip6_arpa
if !ipv6?
raise ArgumentError, "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 ArgumentError, "not an IPv6 address"
end
return _reverse + ".ip6.int"
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 "unsupported address family"
end
return sprintf("#<%s: %s:%s/%s>", self.class.name,
af, _to_string(@addr), _to_string(@mask_addr))
end
protected
def set(addr, *family)
case family[0] ? family[0] : @family
when Socket::AF_INET
if addr < 0 || addr > IN4MASK
raise ArgumentError, "invalid address"
end
when Socket::AF_INET6
if addr < 0 || addr > IN6MASK
raise ArgumentError, "invalid address"
end
else
raise ArgumentError, "unsupported address family"
end
@addr = addr
if family[0]
@family = family[0]
end
return self
end
def mask!(mask)
if mask.kind_of?(String)
if mask =~ /^\d+$/
prefixlen = mask.to_i
else
m = IPAddr.new(mask)
if m.family != @family
raise ArgumentError, "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 ArgumentError, "invalid length"
end
masklen = 32 - prefixlen
@mask_addr = ((IN4MASK >> masklen) << masklen)
when Socket::AF_INET6
if prefixlen < 0 || prefixlen > 128
raise ArgumentError, "invalid length"
end
masklen = 128 - prefixlen
@mask_addr = ((IN6MASK >> masklen) << masklen)
else
raise "unsupported address family"
end
@addr = ((@addr >> masklen) << masklen)
return self
end
private
# Creates a new ipaddr containing the given human readable form of
# an IP address. It also accepts `address/prefixlen' and
# `address/mask'. When prefixlen or mask is specified, it returns a
# masked ipaddr. IPv6 address may beenclosed with `[' and `]'.
#
# Although an address family is determined automatically from a
# specified address, you can specify an address family explicitly by
# the optional second argument.
def initialize(addr = '::', family = Socket::AF_UNSPEC)
if !addr.kind_of?(String)
if family != Socket::AF_INET6 && family != Socket::AF_INET
raise ArgumentError, "unsupported address family"
end
set(addr, family)
@mask_addr = (family == Socket::AF_INET) ? IN4MASK : IN6MASK
return
end
prefix, prefixlen = addr.split('/')
if prefix =~ /^\[(.*)\]$/i
prefix = $1
family = Socket::AF_INET6
end
# It seems AI_NUMERICHOST doesn't do the job.
#Socket.getaddrinfo(left, nil, Socket::AF_INET6, Socket::SOCK_STREAM, nil,
# Socket::AI_NUMERICHOST)
begin
IPSocket.getaddress(prefix) # test if address is vaild
rescue
raise ArgumentError, "invalid address"
end
@addr = @family = nil
if family == Socket::AF_UNSPEC || family == Socket::AF_INET
@addr = in_addr(prefix)
if @addr
@family = Socket::AF_INET
end
end
if !@addr && (family == Socket::AF_UNSPEC || family == Socket::AF_INET6)
@addr = in6_addr(prefix)
@family = Socket::AF_INET6
end
if family != Socket::AF_UNSPEC && @family != family
raise ArgumentError, "address family unmatch"
end
if prefixlen
mask!(prefixlen)
else
@mask_addr = (family == Socket::AF_INET) ? IN4MASK : IN6MASK
end
end
def in_addr(addr)
if addr =~ /^\d+\.\d+\.\d+\.\d+$/
n = 0
addr.split('.').each { |i|
n <<= 8
n += i.to_i
}
return n
end
return nil
end
def in6_addr(left)
case left
when /^::ffff:(\d+\.\d+\.\d+\.\d+)$/i
return in_addr($1) + 0xffff00000000
when /^::(\d+\.\d+\.\d+\.\d+)$/i
return in_addr($1)
when /[^0-9a-f:]/i
raise ArgumentError, "invalid address"
when /^(.*)::(.*)$/
left, right = $1, $2
else
right = ''
end
l = left.split(':')
r = right.split(':')
rest = 8 - l.size - r.size
if rest < 0
return nil
end
a = [l, Array.new(rest, '0'), r].flatten!
n = 0
a.each { |i|
n <<= 16
n += i.hex
}
return n
end
def addr_mask(addr)
case @family
when Socket::AF_INET
addr &= IN4MASK
when Socket::AF_INET6
addr &= IN6MASK
else
raise "unsupported address family"
end
return addr
end
def _reverse
case @family
when Socket::AF_INET
return (0..3).map { |i|
(@addr >> (8 * i)) & 0xff
}.join('.')
when Socket::AF_INET6
return ("%.32x" % @addr).reverse!.gsub!(/.(?!$)/, '\&.')
else
raise "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 "unsupported address family"
end
end
end
if $0 == __FILE__
eval DATA.read, nil, $0, __LINE__+4
end
__END__
require 'test/unit'
require 'test/unit/ui/console/testrunner'
class TC_IPAddr < Test::Unit::TestCase
def test_s_new
assert_nothing_raised {
IPAddr.new("3FFE:505:ffff::/48")
IPAddr.new("0:0:0:1::")
IPAddr.new("2001:200:300::/48")
}
a = IPAddr.new
assert_equal("::", a.to_s)
assert_equal("0000:0000:0000:0000:0000:0000:0000:0000", a.to_string)
assert_equal(Socket::AF_INET6, a.family)
a = IPAddr.new("0123:4567:89ab:cdef:0ABC:DEF0:1234:5678")
assert_equal("123:4567:89ab:cdef:abc:def0:1234:5678", a.to_s)
assert_equal("0123:4567:89ab:cdef:0abc:def0:1234:5678", a.to_string)
assert_equal(Socket::AF_INET6, a.family)
a = IPAddr.new("3ffe:505:2::/48")
assert_equal("3ffe:505:2::", a.to_s)
assert_equal("3ffe:0505:0002:0000:0000:0000:0000:0000", a.to_string)
assert_equal(Socket::AF_INET6, a.family)
assert_equal(false, a.ipv4?)
assert_equal(true, a.ipv6?)
assert_equal("#<IPAddr: IPv6:3ffe:0505:0002:0000:0000:0000:0000:0000/ffff:ffff:ffff:0000:0000:0000:0000:0000>", a.inspect)
a = IPAddr.new("3ffe:505:2::/ffff:ffff:ffff::")
assert_equal("3ffe:505:2::", a.to_s)
assert_equal("3ffe:0505:0002:0000:0000:0000:0000:0000", a.to_string)
assert_equal(Socket::AF_INET6, a.family)
a = IPAddr.new("0.0.0.0")
assert_equal("0.0.0.0", a.to_s)
assert_equal("0.0.0.0", a.to_string)
assert_equal(Socket::AF_INET, a.family)
a = IPAddr.new("192.168.1.2")
assert_equal("192.168.1.2", a.to_s)
assert_equal("192.168.1.2", a.to_string)
assert_equal(Socket::AF_INET, a.family)
assert_equal(true, a.ipv4?)
assert_equal(false, a.ipv6?)
a = IPAddr.new("192.168.1.2/24")
assert_equal("192.168.1.0", a.to_s)
assert_equal("192.168.1.0", a.to_string)
assert_equal(Socket::AF_INET, a.family)
assert_equal("#<IPAddr: IPv4:192.168.1.0/255.255.255.0>", a.inspect)
a = IPAddr.new("192.168.1.2/255.255.255.0")
assert_equal("192.168.1.0", a.to_s)
assert_equal("192.168.1.0", a.to_string)
assert_equal(Socket::AF_INET, a.family)
assert_equal("0:0:0:1::", IPAddr.new("0:0:0:1::").to_s)
assert_equal("2001:200:300::", IPAddr.new("2001:200:300::/48").to_s)
assert_equal("2001:200:300::", IPAddr.new("[2001:200:300::]/48").to_s)
[
["fe80::1%fxp0"],
["::1/255.255.255.0"],
["::1:192.168.1.2/120"],
[IPAddr.new("::1").to_i],
["::ffff:192.168.1.2/120", Socket::AF_INET],
["[192.168.1.2]/120"],
].each { |args|
assert_raises(ArgumentError) {
IPAddr.new(*args)
}
}
end
def test_s_new_ntoh
addr = ''
IPAddr.new("1234:5678:9abc:def0:1234:5678:9abc:def0").hton.each_byte { |c|
addr += sprintf("%02x", c)
}
assert_equal("123456789abcdef0123456789abcdef0", addr)
addr = ''
IPAddr.new("123.45.67.89").hton.each_byte { |c|
addr += sprintf("%02x", c)
}
assert_equal(sprintf("%02x%02x%02x%02x", 123, 45, 67, 89), addr)
a = IPAddr.new("3ffe:505:2::")
assert_equal("3ffe:505:2::", IPAddr.new_ntoh(a.hton).to_s)
a = IPAddr.new("192.168.2.1")
assert_equal("192.168.2.1", IPAddr.new_ntoh(a.hton).to_s)
end
def test_ipv4_compat
a = IPAddr.new("::192.168.1.2")
assert_equal("::192.168.1.2", a.to_s)
assert_equal("0000:0000:0000:0000:0000:0000:c0a8:0102", a.to_string)
assert_equal(Socket::AF_INET6, a.family)
assert_equal(true, a.ipv4_compat?)
b = a.native
assert_equal("192.168.1.2", b.to_s)
assert_equal(Socket::AF_INET, b.family)
assert_equal(false, b.ipv4_compat?)
a = IPAddr.new("192.168.1.2")
b = a.ipv4_compat
assert_equal("::192.168.1.2", b.to_s)
assert_equal(Socket::AF_INET6, b.family)
end
def test_ipv4_mapped
a = IPAddr.new("::ffff:192.168.1.2")
assert_equal("::ffff:192.168.1.2", a.to_s)
assert_equal("0000:0000:0000:0000:0000:ffff:c0a8:0102", a.to_string)
assert_equal(Socket::AF_INET6, a.family)
assert_equal(true, a.ipv4_mapped?)
b = a.native
assert_equal("192.168.1.2", b.to_s)
assert_equal(Socket::AF_INET, b.family)
assert_equal(false, b.ipv4_mapped?)
a = IPAddr.new("192.168.1.2")
b = a.ipv4_mapped
assert_equal("::ffff:192.168.1.2", b.to_s)
assert_equal(Socket::AF_INET6, b.family)
end
def test_reverse
assert_equal("f.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.0.5.0.5.0.e.f.f.3.ip6.arpa", IPAddr.new("3ffe:505:2::f").reverse)
assert_equal("1.2.168.192.in-addr.arpa", IPAddr.new("192.168.2.1").reverse)
end
def test_ip6_arpa
assert_equal("f.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.0.5.0.5.0.e.f.f.3.ip6.arpa", IPAddr.new("3ffe:505:2::f").ip6_arpa)
assert_raises(ArgumentError) {
IPAddr.new("192.168.2.1").ip6_arpa
}
end
def test_ip6_int
assert_equal("f.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.0.0.0.5.0.5.0.e.f.f.3.ip6.int", IPAddr.new("3ffe:505:2::f").ip6_int)
assert_raises(ArgumentError) {
IPAddr.new("192.168.2.1").ip6_int
}
end
def test_to_s
assert_equal("3ffe:0505:0002:0000:0000:0000:0000:0001", IPAddr.new("3ffe:505:2::1").to_string)
assert_equal("3ffe:505:2::1", IPAddr.new("3ffe:505:2::1").to_s)
end
end
class TC_Operator < Test::Unit::TestCase
IN6MASK32 = "ffff:ffff::"
IN6MASK128 = "ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff"
def setup
@in6_addr_any = IPAddr.new()
@a = IPAddr.new("3ffe:505:2::/48")
@b = IPAddr.new("0:0:0:1::")
@c = IPAddr.new(IN6MASK32)
end
alias set_up setup
def test_or
assert_equal("3ffe:505:2:1::", (@a | @b).to_s)
a = @a
a |= @b
assert_equal("3ffe:505:2:1::", a.to_s)
assert_equal("3ffe:505:2::", @a.to_s)
assert_equal("3ffe:505:2:1::",
(@a | 0x00000000000000010000000000000000).to_s)
end
def test_and
assert_equal("3ffe:505::", (@a & @c).to_s)
a = @a
a &= @c
assert_equal("3ffe:505::", a.to_s)
assert_equal("3ffe:505:2::", @a.to_s)
assert_equal("3ffe:505::", (@a & 0xffffffff000000000000000000000000).to_s)
end
def test_shift_right
assert_equal("0:3ffe:505:2::", (@a >> 16).to_s)
a = @a
a >>= 16
assert_equal("0:3ffe:505:2::", a.to_s)
assert_equal("3ffe:505:2::", @a.to_s)
end
def test_shift_left
assert_equal("505:2::", (@a << 16).to_s)
a = @a
a <<= 16
assert_equal("505:2::", a.to_s)
assert_equal("3ffe:505:2::", @a.to_s)
end
def test_carrot
a = ~@in6_addr_any
assert_equal(IN6MASK128, a.to_s)
assert_equal("::", @in6_addr_any.to_s)
end
def test_equal
assert_equal(true, @a == IPAddr.new("3ffe:505:2::"))
assert_equal(false, @a == IPAddr.new("3ffe:505:3::"))
assert_equal(true, @a != IPAddr.new("3ffe:505:3::"))
assert_equal(false, @a != IPAddr.new("3ffe:505:2::"))
end
def test_mask
a = @a.mask(32)
assert_equal("3ffe:505::", a.to_s)
assert_equal("3ffe:505:2::", @a.to_s)
end
def test_include?
assert_equal(true, @a.include?(IPAddr.new("3ffe:505:2::")))
assert_equal(true, @a.include?(IPAddr.new("3ffe:505:2::1")))
assert_equal(false, @a.include?(IPAddr.new("3ffe:505:3::")))
net1 = IPAddr.new("192.168.2.0/24")
assert_equal(true, net1.include?(IPAddr.new("192.168.2.0")))
assert_equal(true, net1.include?(IPAddr.new("192.168.2.255")))
assert_equal(false, net1.include?(IPAddr.new("192.168.3.0")))
# test with integer parameter
int = (192 << 24) + (168 << 16) + (2 << 8) + 13
assert_equal(true, net1.include?(int))
assert_equal(false, net1.include?(int+255))
end
end
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