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Add utility function to mask IPs

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This commit is contained in:
Alfredo Cardigliano 2025-03-21 09:03:48 +01:00
parent 346e67fe27
commit a35455bf27
1 changed files with 17 additions and 1 deletions
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18
scripts/lua/modules/ipv4_utils.lua
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@ -114,6 +114,22 @@ function ipv4_utils.cmp(a, b)
return 0
end
-- Mask an IPv4 address with a netmask
-- Example: 192.168.33.1 / 255.255.254.0 -> 192.168.32.0
function ipv4_utils.maskIp(ip, netmask)
local ip_parts = string.split(ip, "%.")
local netmask_parts = string.split(netmask, "%.")
local r = {}
for i=1,4 do
local ip_part = tonumber(ip_parts[i])
local netmask_part = tonumber(netmask_parts[i])
r[i] = tostring(ip_part & netmask_part)
end
return r[1].."."..r[2].."."..r[3].."."..r[4]
end
-- Assumption: 32bit integer are used. This is already assumed by http://bitop.luajit.org/semantics.html
function ipv4_utils.ipToInt(ip)
local intrepr = 0
@ -162,7 +178,7 @@ function ipv4_utils.includes(network, netmask, ip)
local upper = ipv4_utils.broadcast_address(network, netmask)
return (ipv4_utils.cmp(ip, lower) >= 0) and
(ipv4_utils.cmp(ip, upper) <= 0)
(ipv4_utils.cmp(ip, upper) <= 0)
end
-- Get the broadcast address for the given netmask