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-rw-r--r--util/ip.lua250
1 files changed, 124 insertions, 126 deletions
diff --git a/util/ip.lua b/util/ip.lua
index 81a98ef7..0ec9e297 100644
--- a/util/ip.lua
+++ b/util/ip.lua
@@ -5,69 +5,76 @@
-- 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 ip_mt = {
+ __index = function (ip, key)
+ local method = ip_methods[key];
+ if not method then return nil; end
+ local ret = method(ip);
+ ip[key] = ret;
+ return ret;
+ end,
+ __tostring = function (ip) return ip.addr; end,
+ __eq = function (ipA, ipB) return ipA.packed == ipB.packed; 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
local zone;
- if proto == "IPv6" and ipStr:find('%', 1, true) then
+ if (not proto or proto == "IPv6") and ipStr:find('%', 1, true) then
ipStr, zone = ipStr:match("^(.-)%%(.*)");
end
- if proto == "IPv6" and ipStr:find('.', 1, true) then
- local changed;
- ipStr, changed = ipStr:gsub(":(%d+)%.(%d+)%.(%d+)%.(%d+)$", function(a,b,c,d)
- return (":%04X:%04X"):format(a*256+b,c*256+d);
- end);
- if changed ~= 1 then return nil, "invalid-address"; end
+
+ local packed, err = net.pton(ipStr);
+ if not packed then return packed, err end
+ if proto == "IPv6" and #packed ~= 16 then
+ return nil, "invalid-ipv6";
+ elseif proto == "IPv4" and #packed ~= 4 then
+ return nil, "invalid-ipv4";
+ elseif not proto then
+ if #packed == 16 then
+ proto = "IPv6";
+ elseif #packed == 4 then
+ proto = "IPv4";
+ else
+ return nil, "unknown protocol";
+ end
+ elseif proto ~= "IPv6" and proto ~= "IPv4" then
+ return nil, "invalid protocol";
end
- return setmetatable({ addr = ipStr, proto = proto, zone = zone }, ip_mt);
+ return setmetatable({ addr = ipStr, packed = packed, proto = proto, zone = zone }, ip_mt);
+end
+
+function ip_methods:normal()
+ return net.ntop(self.packed);
end
-local function toBits(ip)
- local result = "";
- local fields = {};
+function ip_methods.bits(ip)
+ return hex.to(ip.packed):upper():gsub(".", hex2bits);
+end
+
+function ip_methods.bits_full(ip)
if ip.proto == "IPv4" then
ip = ip.toV4mapped;
end
- ip = (ip.addr):upper();
- ip:gsub("([^:]*):?", function (c) fields[#fields + 1] = c end);
- if not ip:match(":$") then fields[#fields] = nil; end
- for i, field in ipairs(fields) do
- if field:len() == 0 and i ~= 1 and i ~= #fields then
- for _ = 1, 16 * (9 - #fields) do
- result = result .. "0";
- end
- else
- for _ = 1, 4 - field:len() do
- result = result .. "0000";
- end
- for j = 1, field:len() do
- result = result .. hex2bits[field:sub(j, j)];
- end
- end
- end
- return result;
+ return ip.bits;
end
+local match;
+
local function commonPrefixLength(ipA, ipB)
- ipA, ipB = toBits(ipA), toBits(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;
@@ -76,56 +83,60 @@ local function commonPrefixLength(ipA, ipB)
return 128;
end
+-- Instantiate once
+local loopback = new_ip("::1");
+local loopback4 = new_ip("127.0.0.0");
+local sixtofour = new_ip("2002::");
+local teredo = new_ip("2001::");
+local linklocal = new_ip("fe80::");
+local linklocal4 = new_ip("169.254.0.0");
+local uniquelocal = new_ip("fc00::");
+local sitelocal = new_ip("fec0::");
+local sixbone = new_ip("3ffe::");
+local defaultunicast = new_ip("::");
+local multicast = new_ip("ff00::");
+local ipv6mapped = new_ip("::ffff:0:0");
+
local function v4scope(ip)
- local fields = {};
- ip:gsub("([^.]*).?", function (c) fields[#fields + 1] = tonumber(c) end);
- -- Loopback:
- if fields[1] == 127 then
+ if match(ip, loopback4, 8) then
return 0x2;
- -- Link-local unicast:
- elseif fields[1] == 169 and fields[2] == 254 then
+ elseif match(ip, linklocal4) then
return 0x2;
- -- Global unicast:
- else
+ else -- Global unicast
return 0xE;
end
end
local function v6scope(ip)
- -- Loopback:
- if ip:match("^[0:]*1$") then
+ if ip == loopback then
return 0x2;
- -- Link-local unicast:
- elseif ip:match("^[Ff][Ee][89ABab]") then
+ elseif match(ip, linklocal, 10) then
return 0x2;
- -- Site-local unicast:
- elseif ip:match("^[Ff][Ee][CcDdEeFf]") then
+ elseif match(ip, sitelocal, 10) then
return 0x5;
- -- Multicast:
- elseif ip:match("^[Ff][Ff]") then
- return tonumber("0x"..ip:sub(4,4));
- -- Global unicast:
- else
+ elseif match(ip, multicast, 10) then
+ return ip.packed:byte(2) % 0x10;
+ else -- Global unicast
return 0xE;
end
end
local function label(ip)
- if commonPrefixLength(ip, new_ip("::1", "IPv6")) == 128 then
+ if ip == loopback then
return 0;
- elseif commonPrefixLength(ip, new_ip("2002::", "IPv6")) >= 16 then
+ elseif match(ip, sixtofour, 16) then
return 2;
- elseif commonPrefixLength(ip, new_ip("2001::", "IPv6")) >= 32 then
+ elseif match(ip, teredo, 32) then
return 5;
- elseif commonPrefixLength(ip, new_ip("fc00::", "IPv6")) >= 7 then
+ elseif match(ip, uniquelocal, 7) then
return 13;
- elseif commonPrefixLength(ip, new_ip("fec0::", "IPv6")) >= 10 then
+ elseif match(ip, sitelocal, 10) then
return 11;
- elseif commonPrefixLength(ip, new_ip("3ffe::", "IPv6")) >= 16 then
+ elseif match(ip, sixbone, 16) then
return 12;
- elseif commonPrefixLength(ip, new_ip("::", "IPv6")) >= 96 then
+ elseif match(ip, defaultunicast, 96) then
return 3;
- elseif commonPrefixLength(ip, new_ip("::ffff:0:0", "IPv6")) >= 96 then
+ elseif match(ip, ipv6mapped, 96) then
return 4;
else
return 1;
@@ -133,91 +144,67 @@ local function label(ip)
end
local function precedence(ip)
- if commonPrefixLength(ip, new_ip("::1", "IPv6")) == 128 then
+ if ip == loopback then
return 50;
- elseif commonPrefixLength(ip, new_ip("2002::", "IPv6")) >= 16 then
+ elseif match(ip, sixtofour, 16) then
return 30;
- elseif commonPrefixLength(ip, new_ip("2001::", "IPv6")) >= 32 then
+ elseif match(ip, teredo, 32) then
return 5;
- elseif commonPrefixLength(ip, new_ip("fc00::", "IPv6")) >= 7 then
+ elseif match(ip, uniquelocal, 7) then
return 3;
- elseif commonPrefixLength(ip, new_ip("fec0::", "IPv6")) >= 10 then
+ elseif match(ip, sitelocal, 10) then
return 1;
- elseif commonPrefixLength(ip, new_ip("3ffe::", "IPv6")) >= 16 then
+ elseif match(ip, sixbone, 16) then
return 1;
- elseif commonPrefixLength(ip, new_ip("::", "IPv6")) >= 96 then
+ elseif match(ip, defaultunicast, 96) then
return 1;
- elseif commonPrefixLength(ip, new_ip("::ffff:0:0", "IPv6")) >= 96 then
+ elseif match(ip, ipv6mapped, 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;
+ local value = new_ip("::ffff:" .. self.normal);
return value;
end
function ip_methods:label()
- local value;
if self.proto == "IPv4" then
- value = label(self.toV4mapped);
+ return label(self.toV4mapped);
else
- value = label(self);
+ return label(self);
end
- self.label = value;
- return value;
end
function ip_methods:precedence()
- local value;
if self.proto == "IPv4" then
- value = precedence(self.toV4mapped);
+ return precedence(self.toV4mapped);
else
- value = precedence(self);
+ return precedence(self);
end
- self.precedence = value;
- return value;
end
function ip_methods:scope()
- local value;
if self.proto == "IPv4" then
- value = v4scope(self.addr);
+ return v4scope(self);
else
- value = v6scope(self.addr);
+ return v6scope(self);
end
- self.scope = value;
- return value;
end
+local rfc1918_8 = new_ip("10.0.0.0");
+local rfc1918_12 = new_ip("172.16.0.0");
+local rfc1918_16 = new_ip("192.168.0.0");
+local rfc6598 = new_ip("100.64.0.0");
+
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
+ return match(self, rfc1918_8, 8) or match(self, rfc1918_12, 12) or match(self, rfc1918_16) or match(self, rfc6598, 10);
end
- self.private = private;
return private;
end
@@ -231,15 +218,26 @@ local function parse_cidr(cidr)
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
+function match(ipA, ipB, bits)
+ if not bits or bits >= 128 or ipB.proto == "IPv4" and bits >= 32 then
+ return ipA == ipB;
+ elseif bits < 1 then
+ return true;
+ end
+ if ipA.proto ~= ipB.proto then
+ if ipA.proto == "IPv4" then
+ ipA = ipA.toV4mapped;
+ elseif ipB.proto == "IPv4" then
+ ipB = ipB.toV4mapped;
+ bits = bits + (128 - 32);
+ end
end
- return common_bits >= (bits or 128);
+ return ipA.bits:sub(1, bits) == ipB.bits:sub(1, bits);
end
-return {new_ip = new_ip,
+return {
+ new_ip = new_ip,
commonPrefixLength = commonPrefixLength,
parse_cidr = parse_cidr,
- match=match};
+ match = match,
+};
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-03 13:11:19 +0000