+--[[
+
+LuCI ip calculation libarary
+(c) 2008 Jo-Philipp Wich <xm@leipzig.freifunk.net>
+(c) 2008 Steven Barth <steven@midlink.org>
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+$Id$
+
+]]--
+
+module( "luci.ip", package.seeall )
+
+require("bit")
+require("luci.util")
+
+LITTLE_ENDIAN = not luci.util.bigendian()
+BIG_ENDIAN = not LITTLE_ENDIAN
+
+FAMILY_INET4 = 0x04
+FAMILY_INET6 = 0x06
+
+
+local function __bless(x)
+ return setmetatable( x, {
+ __index = luci.ip.cidr,
+ __add = luci.ip.cidr.add,
+ __lt = luci.ip.cidr.lower,
+ __eq = luci.ip.cidr.equal,
+ __le =
+ function(...)
+ return luci.ip.cidr.equal(...) or luci.ip.cidr.lower(...)
+ end
+ } )
+end
+
+local function __mask16(bits)
+ return bit.lshift(
+ bit.rshift( 0xFFFF, 16 - bits % 16 ),
+ 16 - bits % 16
+ )
+end
+
+-- htons(), htonl(), ntohs(), ntohl()
+
+function htons(x)
+ if LITTLE_ENDIAN then
+ return bit.bor(
+ bit.rshift( x, 8 ),
+ bit.band( bit.lshift( x, 8 ), 0xFF00 )
+ )
+ else
+ return x
+ end
+end
+
+function htonl(x)
+ if LITTLE_ENDIAN then
+ return bit.bor(
+ bit.lshift( htons( bit.band( x, 0xFFFF ) ), 16 ),
+ htons( bit.rshift( x, 16 ) )
+ )
+ else
+ return x
+ end
+end
+
+ntohs = htons
+ntohl = htonl
+
+
+function IPv4(address)
+ local data = {}
+ local prefix = address:match("/(.+)")
+
+ if prefix then
+ address = address:gsub("/.+","")
+ prefix = tonumber(prefix)
+ if not prefix or prefix < 0 or prefix > 32 then return nil end
+ else
+ prefix = 32
+ end
+
+ local b1, b2, b3, b4 = address:match("(%d+)%.(%d+)%.(%d+)%.(%d+)")
+
+ b1 = tonumber(b1)
+ b2 = tonumber(b2)
+ b3 = tonumber(b3)
+ b4 = tonumber(b4)
+
+ if b1 and b1 <= 255 and
+ b2 and b2 <= 255 and
+ b3 and b3 <= 255 and
+ b4 and b4 <= 255
+ then
+ return __bless({
+ FAMILY_INET4,
+ { b1 * 256 + b2, b3 * 256 + b4 },
+ prefix
+ })
+ end
+end
+
+function IPv6(address)
+ local data = {}
+ local prefix = address:match("/(.+)")
+
+ if prefix then
+ address = address:gsub("/.+","")
+ prefix = tonumber(prefix)
+ if not prefix or prefix < 0 or prefix > 128 then return nil end
+ else
+ prefix = 128
+ end
+
+ local borderl = address:sub(1, 1) == ":" and 2 or 1
+ local borderh, zeroh, chunk, block
+
+ if #address > 45 then return nil end
+
+ repeat
+ borderh = address:find(":", borderl, true)
+ if not borderh then break end
+
+ block = tonumber(address:sub(borderl, borderh - 1), 16)
+ if block and block <= 65535 then
+ table.insert(data, block)
+ else
+ if zeroh or borderh - borderl > 1 then return nil end
+ zeroh = #data + 1
+ end
+
+ borderl = borderh + 1
+ until #data == 7
+
+ chunk = address:sub(borderl)
+ if #chunk > 0 and #chunk <= 4 then
+ block = tonumber(chunk, 16)
+ if not block or block > 65535 then return nil end
+
+ table.insert(data, block)
+ elseif #chunk > 4 then
+ if #data == 7 or #chunk > 15 then return nil end
+ borderl = 1
+ for i=1, 4 do
+ borderh = chunk:find(".", borderl, true)
+ if not borderh and i < 4 then return nil end
+ borderh = borderh and borderh - 1
+
+ block = tonumber(chunk:sub(borderl, borderh))
+ if not block or block > 255 then return nil end
+
+ if i == 1 or i == 3 then
+ table.insert(data, block * 256)
+ else
+ data[#data] = data[#data] + block
+ end
+
+ borderl = borderh and borderh + 2
+ end
+ end
+
+ if zeroh then
+ if #data == 8 then return nil end
+ while #data < 8 do
+ table.insert(data, zeroh, 0)
+ end
+ end
+
+ if #data == 8 then
+ return __bless({ FAMILY_INET6, data, prefix })
+ end
+end
+
+
+cidr = luci.util.class()
+
+function cidr.is4( self )
+ return self[1] == FAMILY_INET4
+end
+
+function cidr.is6( self )
+ return self[1] == FAMILY_INET6
+end
+
+function cidr.string( self )
+ local str
+ if self:is4() then
+ str = string.format(
+ "%d.%d.%d.%d",
+ bit.rshift(self[2][1], 8), bit.band(self[2][1], 0xFF),
+ bit.rshift(self[2][2], 8), bit.band(self[2][2], 0xFF)
+ )
+ if self[3] < 32 then
+ str = str .. "/" .. self[3]
+ end
+ elseif self:is6() then
+ str = string.format( "%X:%X:%X:%X:%X:%X:%X:%X", unpack(self[2]) )
+ if self[3] < 128 then
+ str = str .. "/" .. self[3]
+ end
+ end
+ return str
+end
+
+function cidr.lower( self, addr )
+ assert( self[1] == addr[1], "Can't compare IPv4 and IPv6 addresses" )
+ for i = 1, #self[2] do
+ if self[2][i] ~= addr[2][i] then
+ return self[2][i] < addr[2][i]
+ end
+ end
+ return false
+end
+
+function cidr.higher( self, addr )
+ assert( self[1] == addr[1], "Can't compare IPv4 and IPv6 addresses" )
+ for i = 1, #self[2] do
+ if self[2][i] ~= addr[2][i] then
+ return self[2][i] > addr[2][i]
+ end
+ end
+ return false
+end
+
+function cidr.equal( self, addr )
+ assert( self[1] == addr[1], "Can't compare IPv4 and IPv6 addresses" )
+ for i = 1, #self[2] do
+ if self[2][i] ~= addr[2][i] then
+ return false
+ end
+ end
+ return true
+end
+
+function cidr.prefix( self )
+ return self[3]
+end
+
+function cidr.network( self )
+ local data = { }
+
+ for i = 1, math.floor( self[3] / 16 ) do
+ table.insert( data, self[2][i] )
+ end
+
+ table.insert( data, bit.band( self[2][1+#data], __mask16(self[3]) ) )
+
+ for i = #data, #self[2] do
+ table.insert( data, 0 )
+ end
+
+ return __bless({ self[1], data, self:is4() and 32 or 128 })
+end
+
+function cidr.host( self )
+ return __bless({ self[1], data, self:is4() and 32 or 128 })
+end
+
+function cidr.mask( self, bits )
+ local data = { }
+ bits = bits or self[3]
+
+ for i = 1, math.floor( bits / 16 ) do
+ table.insert( data, 0xFFFF )
+ end
+
+ table.insert( data, __mask16(bits) )
+
+ for i = #data + 1, #self[2] do
+ table.insert( data, 0 )
+ end
+
+ return __bless({ self[1], data, self:is4() and 32 or 128 })
+end
+
+function cidr.contains( self, addr )
+ if self:mask() <= addr:mask() then
+ return self:mask(addr:prefix()) == addr:mask()
+ end
+
+ return false
+end
+
+function cidr.add( self, amount )
+ local shorts = { bit.rshift(amount, 16), bit.band(amount, 0xFFFF) }
+ local data = { unpack(self[2]) }
+
+ for pos = #data, 1, -1 do
+ local add = ( #shorts > 0 ) and table.remove( shorts, #shorts ) or 0
+ if ( data[pos] + add ) > 0xFFFF then
+ data[pos] = ( data[pos] + add ) % 0xFFFF
+ if pos > 2 then
+ data[pos-1] = data[pos-1] + ( add - data[pos] )
+ end
+ else
+ data[pos] = data[pos] + add
+ end
+ end
+
+ return __bless({ self[1], data, self:is4() and 32 and 128 })
+end
projects / project / luci.git / commitdiff