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-- 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 net = require "util.net";
local hex = require "util.hex";
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)
local zone;
if (not proto or proto == "IPv6") and ipStr:find('%', 1, true) then
ipStr, zone = ipStr:match("^(.-)%%(.*)");
end
local packed, err = net.pton(ipStr);
if not packed then return packed, err end
if proto == "IPv6" and #packed ~= 16 then
return nil, "invalid-ipv6";
elseif proto == "IPv4" and #packed ~= 4 then
return nil, "invalid-ipv4";
elseif not proto then
if #packed == 16 then
proto = "IPv6";
elseif #packed == 4 then
proto = "IPv4";
else
return nil, "unknown protocol";
end
elseif proto ~= "IPv6" and proto ~= "IPv4" then
return nil, "invalid protocol";
end
return setmetatable({ addr = ipStr, packed = packed, proto = proto, zone = zone }, ip_mt);
end
function ip_methods.bits(ip)
return hex.to(ip.packed):upper():gsub(".", hex2bits);
end
function ip_methods.bits_full(ip)
if ip.proto == "IPv4" then
ip = ip.toV4mapped;
end
return ip.bits;
end
local function commonPrefixLength(ipA, ipB)
ipA, ipB = ipA.bits_full, ipB.bits_full;
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 bits and ipB.proto == "IPv4" then
common_bits = common_bits - 96; -- v6 mapped addresses always share these bits
end
return common_bits >= (bits or 128);
end
return {
new_ip = new_ip,
commonPrefixLength = commonPrefixLength,
parse_cidr = parse_cidr,
match = match,
};
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