From: Jo-Philipp Wich Date: Thu, 7 Aug 2008 12:44:33 +0000 (+0000) Subject: * luci/libs: add preliminary ip calculation library X-Git-Tag: 0.8.0~512 X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=25dd9c5f9b4cb948155ef0d55edd66a239ba7118;p=oweals%2Fluci.git * luci/libs: add preliminary ip calculation library --- diff --git a/libs/core/luasrc/ip.lua b/libs/core/luasrc/ip.lua new file mode 100644 index 000000000..1edbf8ebe --- /dev/null +++ b/libs/core/luasrc/ip.lua @@ -0,0 +1,307 @@ +--[[ + +LuCI ip calculation libarary +(c) 2008 Jo-Philipp Wich +(c) 2008 Steven Barth + +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