diff options
Diffstat (limited to 'util/ip.lua')
| -rw-r--r-- | util/ip.lua | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/util/ip.lua b/util/ip.lua new file mode 100644 index 00000000..d0ae07eb --- /dev/null +++ b/util/ip.lua @@ -0,0 +1,244 @@ +-- Prosody IM +-- Copyright (C) 2008-2011 Florian Zeitz +-- +-- This project is MIT/X11 licensed. Please see the +-- COPYING file in the source package for more information. +-- + +local ip_methods = {}; +local ip_mt = { __index = function (ip, key) return (ip_methods[key])(ip); end, + __tostring = function (ip) return ip.addr; end, + __eq = function (ipA, ipB) return ipA.addr == ipB.addr; end}; +local hex2bits = { ["0"] = "0000", ["1"] = "0001", ["2"] = "0010", ["3"] = "0011", ["4"] = "0100", ["5"] = "0101", ["6"] = "0110", ["7"] = "0111", ["8"] = "1000", ["9"] = "1001", ["A"] = "1010", ["B"] = "1011", ["C"] = "1100", ["D"] = "1101", ["E"] = "1110", ["F"] = "1111" }; + +local function new_ip(ipStr, proto) + if not proto then + local sep = ipStr:match("^%x+(.)"); + if sep == ":" or (not(sep) and ipStr:sub(1,1) == ":") then + proto = "IPv6" + elseif sep == "." then + proto = "IPv4" + end + if not proto then + return nil, "invalid address"; + end + elseif proto ~= "IPv4" and proto ~= "IPv6" then + return nil, "invalid protocol"; + end + if proto == "IPv6" and ipStr:find('.', 1, true) then + local changed; + ipStr, changed = ipStr:gsub(":(%d+)%.(%d+)%.(%d+)%.(%d+)$", function(a,b,c,d) + return (":%04X:%04X"):format(a*256+b,c*256+d); + end); + if changed ~= 1 then return nil, "invalid-address"; end + end + + return setmetatable({ addr = ipStr, proto = proto }, ip_mt); +end + +local function toBits(ip) + local result = ""; + local fields = {}; + if ip.proto == "IPv4" then + ip = ip.toV4mapped; + end + ip = (ip.addr):upper(); + ip:gsub("([^:]*):?", function (c) fields[#fields + 1] = c end); + if not ip:match(":$") then fields[#fields] = nil; end + for i, field in ipairs(fields) do + if field:len() == 0 and i ~= 1 and i ~= #fields then + for i = 1, 16 * (9 - #fields) do + result = result .. "0"; + end + else + for i = 1, 4 - field:len() do + result = result .. "0000"; + end + for i = 1, field:len() do + result = result .. hex2bits[field:sub(i,i)]; + end + end + end + return result; +end + +local function commonPrefixLength(ipA, ipB) + ipA, ipB = toBits(ipA), toBits(ipB); + for i = 1, 128 do + if ipA:sub(i,i) ~= ipB:sub(i,i) then + return i-1; + end + end + return 128; +end + +local function v4scope(ip) + local fields = {}; + ip:gsub("([^.]*).?", function (c) fields[#fields + 1] = tonumber(c) end); + -- Loopback: + if fields[1] == 127 then + return 0x2; + -- Link-local unicast: + elseif fields[1] == 169 and fields[2] == 254 then + return 0x2; + -- Global unicast: + else + return 0xE; + end +end + +local function v6scope(ip) + -- Loopback: + if ip:match("^[0:]*1$") then + return 0x2; + -- Link-local unicast: + elseif ip:match("^[Ff][Ee][89ABab]") then + return 0x2; + -- Site-local unicast: + elseif ip:match("^[Ff][Ee][CcDdEeFf]") then + return 0x5; + -- Multicast: + elseif ip:match("^[Ff][Ff]") then + return tonumber("0x"..ip:sub(4,4)); + -- Global unicast: + else + return 0xE; + end +end + +local function label(ip) + if commonPrefixLength(ip, new_ip("::1", "IPv6")) == 128 then + return 0; + elseif commonPrefixLength(ip, new_ip("2002::", "IPv6")) >= 16 then + return 2; + elseif commonPrefixLength(ip, new_ip("2001::", "IPv6")) >= 32 then + return 5; + elseif commonPrefixLength(ip, new_ip("fc00::", "IPv6")) >= 7 then + return 13; + elseif commonPrefixLength(ip, new_ip("fec0::", "IPv6")) >= 10 then + return 11; + elseif commonPrefixLength(ip, new_ip("3ffe::", "IPv6")) >= 16 then + return 12; + elseif commonPrefixLength(ip, new_ip("::", "IPv6")) >= 96 then + return 3; + elseif commonPrefixLength(ip, new_ip("::ffff:0:0", "IPv6")) >= 96 then + return 4; + else + return 1; + end +end + +local function precedence(ip) + if commonPrefixLength(ip, new_ip("::1", "IPv6")) == 128 then + return 50; + elseif commonPrefixLength(ip, new_ip("2002::", "IPv6")) >= 16 then + return 30; + elseif commonPrefixLength(ip, new_ip("2001::", "IPv6")) >= 32 then + return 5; + elseif commonPrefixLength(ip, new_ip("fc00::", "IPv6")) >= 7 then + return 3; + elseif commonPrefixLength(ip, new_ip("fec0::", "IPv6")) >= 10 then + return 1; + elseif commonPrefixLength(ip, new_ip("3ffe::", "IPv6")) >= 16 then + return 1; + elseif commonPrefixLength(ip, new_ip("::", "IPv6")) >= 96 then + return 1; + elseif commonPrefixLength(ip, new_ip("::ffff:0:0", "IPv6")) >= 96 then + return 35; + else + return 40; + end +end + +local function toV4mapped(ip) + local fields = {}; + local ret = "::ffff:"; + ip:gsub("([^.]*).?", function (c) fields[#fields + 1] = tonumber(c) end); + ret = ret .. ("%02x"):format(fields[1]); + ret = ret .. ("%02x"):format(fields[2]); + ret = ret .. ":" + ret = ret .. ("%02x"):format(fields[3]); + ret = ret .. ("%02x"):format(fields[4]); + return new_ip(ret, "IPv6"); +end + +function ip_methods:toV4mapped() + if self.proto ~= "IPv4" then return nil, "No IPv4 address" end + local value = toV4mapped(self.addr); + self.toV4mapped = value; + return value; +end + +function ip_methods:label() + local value; + if self.proto == "IPv4" then + value = label(self.toV4mapped); + else + value = label(self); + end + self.label = value; + return value; +end + +function ip_methods:precedence() + local value; + if self.proto == "IPv4" then + value = precedence(self.toV4mapped); + else + value = precedence(self); + end + self.precedence = value; + return value; +end + +function ip_methods:scope() + local value; + if self.proto == "IPv4" then + value = v4scope(self.addr); + else + value = v6scope(self.addr); + end + self.scope = value; + return value; +end + +function ip_methods:private() + local private = self.scope ~= 0xE; + if not private and self.proto == "IPv4" then + local ip = self.addr; + local fields = {}; + ip:gsub("([^.]*).?", function (c) fields[#fields + 1] = tonumber(c) end); + if fields[1] == 127 or fields[1] == 10 or (fields[1] == 192 and fields[2] == 168) + or (fields[1] == 172 and (fields[2] >= 16 or fields[2] <= 32)) then + private = true; + end + end + self.private = private; + return private; +end + +local function parse_cidr(cidr) + local bits; + local ip_len = cidr:find("/", 1, true); + if ip_len then + bits = tonumber(cidr:sub(ip_len+1, -1)); + cidr = cidr:sub(1, ip_len-1); + end + return new_ip(cidr), bits; +end + +local function match(ipA, ipB, bits) + local common_bits = commonPrefixLength(ipA, ipB); + if not bits then + return ipA == ipB; + end + if bits and ipB.proto == "IPv4" then + common_bits = common_bits - 96; -- v6 mapped addresses always share these bits + end + return common_bits >= bits; +end + +return {new_ip = new_ip, + commonPrefixLength = commonPrefixLength, + parse_cidr = parse_cidr, + match=match}; |