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| -rw-r--r-- | README.rst | 14 | ||||
| -rw-r--r-- | lua/inet/core.lua | 11 |
2 files changed, 25 insertions, 0 deletions
@@ -80,6 +80,7 @@ Operator Description ``:ipstring()`` ip as string without prefix ``:cidrstring()`` format CIDR notation ``:netmask()`` generate netmask as an address +``:hostmask()`` generate hostmask as an address ``:flip()`` flip the least significant network bit ================= ====================================== @@ -239,6 +240,19 @@ Build an IP address mask with the netmask of ``foo``. inet('2001:db8::/64'):netmask() -- returns inet('ffff:ffff:ffff:ffff::') +``foo:hostmask()`` +~~~~~~~~~~~~~~~~~ + +Build an IP address mask with the netmask of ``foo``. + +:: + + inet('192.0.2.0/24'):hostmask() -- returns inet('0.0.0.255') + inet('2001:db8::/64'):hostmask() -- returns inet('::ffff:ffff:ffff:ffff') + inet('2001:db8::/116'):hostmask() -- returns inet('::fff') + inet('2001:db8::/112'):hostmask() -- returns inet('::ffff') + + ``foo:flip()`` ~~~~~~~~~~~~~~ diff --git a/lua/inet/core.lua b/lua/inet/core.lua index 0b062e7..f8e17cc 100644 --- a/lua/inet/core.lua +++ b/lua/inet/core.lua @@ -385,6 +385,12 @@ function inet4:netmask() return new_inet4(replace(0xffffffff, 0, 0, hostbits), 32) end +function inet4:hostmask() + local mask = self.mask + local hostbits = 32 - mask + return new_inet4(replace(0xffffffff, 0, hostbits, mask), 32) +end + function inet4:flip() -- find twin by flipping the last network bit local mask = self.mask @@ -716,6 +722,11 @@ function inet6:netmask() return build_inet6_mask(0, mask, 128 - mask) end +function inet6:hostmask() + local mask = self.mask + return build_inet6_mask(mask, 128 - mask, 0) +end + function inet6:flip() -- find twin by flipping the last network bit local mask = self.mask |