author | Matthew Wild <mwild1@gmail.com> |
Mon, 22 Apr 2013 12:24:42 +0100 | |
changeset 5506 | 69ee5b10738d |
parent 4433 | f0e72fbe4d6a |
child 5552 | 40e7a6cf15ff |
permissions | -rw-r--r-- |
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util.ip: New module containing IP related functions
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-- Prosody IM |
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-- Copyright (C) 2008-2011 Florian Zeitz |
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-- |
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-- This project is MIT/X11 licensed. Please see the |
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-- COPYING file in the source package for more information. |
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-- |
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|
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local ip_methods = {}; |
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local ip_mt = { __index = function (ip, key) return (ip_methods[key])(ip); end, |
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__tostring = function (ip) return ip.addr; end, |
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__eq = function (ipA, ipB) return ipA.addr == ipB.addr; end}; |
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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" }; |
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|
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local function new_ip(ipStr, proto) |
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if proto ~= "IPv4" and proto ~= "IPv6" then |
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return nil, "invalid protocol"; |
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end |
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|
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return setmetatable({ addr = ipStr, proto = proto }, ip_mt); |
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end |
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|
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local function toBits(ip) |
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local result = ""; |
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local fields = {}; |
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if ip.proto == "IPv4" then |
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ip = ip.toV4mapped; |
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end |
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ip = (ip.addr):upper(); |
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ip:gsub("([^:]*):?", function (c) fields[#fields + 1] = c end); |
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if not ip:match(":$") then fields[#fields] = nil; end |
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for i, field in ipairs(fields) do |
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if field:len() == 0 and i ~= 1 and i ~= #fields then |
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for i = 1, 16 * (9 - #fields) do |
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result = result .. "0"; |
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end |
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else |
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for i = 1, 4 - field:len() do |
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result = result .. "0000"; |
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end |
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for i = 1, field:len() do |
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result = result .. hex2bits[field:sub(i,i)]; |
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end |
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end |
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end |
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return result; |
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end |
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|
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local function commonPrefixLength(ipA, ipB) |
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ipA, ipB = toBits(ipA), toBits(ipB); |
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for i = 1, 128 do |
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if ipA:sub(i,i) ~= ipB:sub(i,i) then |
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return i-1; |
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end |
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end |
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return 128; |
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end |
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|
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local function v4scope(ip) |
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local fields = {}; |
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ip:gsub("([^.]*).?", function (c) fields[#fields + 1] = tonumber(c) end); |
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-- Loopback: |
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if fields[1] == 127 then |
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return 0x2; |
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-- Link-local unicast: |
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elseif fields[1] == 169 and fields[2] == 254 then |
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return 0x2; |
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-- Site-local unicast: |
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util.ip: Fix syntax error (while I search for my pre-commit hooks)
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elseif (fields[1] == 10) or (fields[1] == 192 and fields[2] == 168) or (fields[1] == 172 and (fields[2] >= 16 and fields[2] < 32)) then |
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return 0x5; |
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-- Global unicast: |
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else |
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return 0xE; |
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end |
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end |
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local function v6scope(ip) |
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-- Loopback: |
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if ip:match("^[0:]*1$") then |
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return 0x2; |
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-- Link-local unicast: |
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elseif ip:match("^[Ff][Ee][89ABab]") then |
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return 0x2; |
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-- Site-local unicast: |
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elseif ip:match("^[Ff][Ee][CcDdEeFf]") then |
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return 0x5; |
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-- Multicast: |
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elseif ip:match("^[Ff][Ff]") then |
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return tonumber("0x"..ip:sub(4,4)); |
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-- Global unicast: |
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else |
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return 0xE; |
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end |
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end |
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|
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local function label(ip) |
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if commonPrefixLength(ip, new_ip("::1", "IPv6")) == 128 then |
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return 0; |
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elseif commonPrefixLength(ip, new_ip("2002::", "IPv6")) >= 16 then |
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return 2; |
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elseif commonPrefixLength(ip, new_ip("::", "IPv6")) >= 96 then |
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return 3; |
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elseif commonPrefixLength(ip, new_ip("::ffff:0:0", "IPv6")) >= 96 then |
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return 4; |
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else |
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105 |
return 1; |
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106 |
end |
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end |
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108 |
|
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local function precedence(ip) |
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if commonPrefixLength(ip, new_ip("::1", "IPv6")) == 128 then |
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return 50; |
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elseif commonPrefixLength(ip, new_ip("2002::", "IPv6")) >= 16 then |
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113 |
return 30; |
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114 |
elseif commonPrefixLength(ip, new_ip("::", "IPv6")) >= 96 then |
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115 |
return 20; |
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116 |
elseif commonPrefixLength(ip, new_ip("::ffff:0:0", "IPv6")) >= 96 then |
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117 |
return 10; |
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else |
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return 40; |
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end |
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end |
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|
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local function toV4mapped(ip) |
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local fields = {}; |
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local ret = "::ffff:"; |
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ip:gsub("([^.]*).?", function (c) fields[#fields + 1] = tonumber(c) end); |
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ret = ret .. ("%02x"):format(fields[1]); |
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ret = ret .. ("%02x"):format(fields[2]); |
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ret = ret .. ":" |
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ret = ret .. ("%02x"):format(fields[3]); |
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ret = ret .. ("%02x"):format(fields[4]); |
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return new_ip(ret, "IPv6"); |
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end |
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|
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function ip_methods:toV4mapped() |
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if self.proto ~= "IPv4" then return nil, "No IPv4 address" end |
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local value = toV4mapped(self.addr); |
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self.toV4mapped = value; |
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return value; |
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end |
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|
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function ip_methods:label() |
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local value; |
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if self.proto == "IPv4" then |
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value = label(self.toV4mapped); |
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else |
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value = label(self); |
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end |
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self.label = value; |
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return value; |
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end |
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|
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function ip_methods:precedence() |
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local value; |
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if self.proto == "IPv4" then |
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value = precedence(self.toV4mapped); |
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else |
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value = precedence(self); |
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end |
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self.precedence = value; |
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return value; |
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162 |
end |
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|
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function ip_methods:scope() |
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local value; |
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if self.proto == "IPv4" then |
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value = v4scope(self.addr); |
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168 |
else |
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value = v6scope(self.addr); |
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170 |
end |
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171 |
self.scope = value; |
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172 |
return value; |
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173 |
end |
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174 |
|
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175 |
return {new_ip = new_ip, |
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176 |
commonPrefixLength = commonPrefixLength}; |