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Add IPAddr#wildcard_mask #44

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Merged
sorah merged 1 commit into from
Apr 10, 2024
Merged

Add IPAddr#wildcard_mask #44

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14 changes: 14 additions & 0 deletions lib/ipaddr.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -464,6 +464,20 @@ def netmask
_to_string(@mask_addr)
end

# Returns the wildcard mask in string format e.g. 0.0.255.255
def wildcard_mask
case @family
when Socket::AF_INET
mask = IN4MASK ^ @mask_addr
when Socket::AF_INET6
mask = IN6MASK ^ @mask_addr
else
raise AddressFamilyError, "unsupported address family"
end

_to_string(mask)
end

# Returns the IPv6 zone identifier, if present.
# Raises InvalidAddressError if not an IPv6 address.
def zone_id
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23 changes: 23 additions & 0 deletions test/test_ipaddr.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -244,6 +244,29 @@ def test_netmask
assert_equal(a.netmask, "255.255.255.0")
end

def test_wildcard_mask
a = IPAddr.new("192.168.1.2/1")
assert_equal(a.wildcard_mask, "127.255.255.255")

a = IPAddr.new("192.168.1.2/8")
assert_equal(a.wildcard_mask, "0.255.255.255")

a = IPAddr.new("192.168.1.2/16")
assert_equal(a.wildcard_mask, "0.0.255.255")

a = IPAddr.new("192.168.1.2/24")
assert_equal(a.wildcard_mask, "0.0.0.255")

a = IPAddr.new("192.168.1.2/32")
assert_equal(a.wildcard_mask, "0.0.0.0")

a = IPAddr.new("3ffe:505:2::/48")
assert_equal(a.wildcard_mask, "0000:0000:0000:ffff:ffff:ffff:ffff:ffff")

a = IPAddr.new("3ffe:505:2::/128")
assert_equal(a.wildcard_mask, "0000:0000:0000:0000:0000:0000:0000:0000")
end

def test_zone_id
a = IPAddr.new("192.168.1.2")
assert_raise(IPAddr::InvalidAddressError) { a.zone_id = '%ab0' }
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