diff options
Diffstat (limited to 'lib/ipcalc.lua')
| -rw-r--r-- | lib/ipcalc.lua | 55 |
1 files changed, 0 insertions, 55 deletions
diff --git a/lib/ipcalc.lua b/lib/ipcalc.lua deleted file mode 100644 index fb05561..0000000 --- a/lib/ipcalc.lua +++ /dev/null @@ -1,55 +0,0 @@ - -module (..., package.seeall) -require("bit") - -function iptoint(str) - -- TODO: support "a.", "a.b.", "a.b.c." - local a,b,c,d = string.match(str, "(%d+).(%d+).(%d+).(%d+)") - if a and b and c and d then - return bit.lshift(a, 24) + bit.lshift(b, 16) + bit.lshift(c, 8) + d - end - return nil -end - -function nettoint(net, mask) - if mask == nil then - mask = string.match(net, "/(.*)") - if mask == nil then - -- no mask provied at all - return iptoint(net) - end - net = string.gsub(net, "/.*", "") - end - - local n = tonumber(mask) - if n == nil then - -- mask is a.b.c.d style - return iptoint(net), iptoint(mask) - end - - -- mask is /24 style - if n > 32 then - return nil - end - return iptoint(net), bit.band(bit.lshift(0xfffffffff, 32 - n), 0xffffffff) -end - - --- same_subnet - check if address is in net/mask --- synopsis: --- same_subnet(addr, net[/mask][, mask]) --- example: --- same_subnet("10.0.0.1", "10.0.0.0/24") --- same_subnet("10.0.0.1", "10.0.0.0", "24") --- same_subnet("10.0.0.1", "10.0.0.0/255.255.255.0") --- same_subnet("10.0.0.1", "10.0.0.0", "255.255.255.0") - -function same_subnet(addr, net, mask) - local a = iptoint(addr) - local n, m = nettoint(net, mask) - if a and n and m then - return bit.band(a, m) == bit.band(n, m) - end - return false -end - |