prosody
3049137d14b6
util/ip.lua

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util/ip.lua @ 7053:3049137d14b6

util.ip: Fix protocol detection of IPv6 addresses beginning with : [Backported from 0.10]
author Matthew Wild <mwild1@gmail.com>
date Sat, 18 May 2013 21:41:17 +0100
parent 7052:306aabf2d57d
child 7055:23de70d19e77
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b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2011 Florian Zeitz
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3 --
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4 -- This project is MIT/X11 licensed. Please see the
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5 -- COPYING file in the source package for more information.
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6 --
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7
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8 local ip_methods = {};
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9 local ip_mt = { __index = function (ip, key) return (ip_methods[key])(ip); end,
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10 __tostring = function (ip) return ip.addr; end,
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11 __eq = function (ipA, ipB) return ipA.addr == ipB.addr; end};
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12 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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13
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14 local function new_ip(ipStr, proto)
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306aabf2d57d util.ip: Automatically determine protocol of IP address if none specified. Return error if invalid. [Backported from 0.10]
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15 if not proto then
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16 local sep = ipStr:match("^%x+(.)");
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17 if sep == ":" or (not(sep) and ipStr:sub(1,1) == ":") then
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18 proto = "IPv6"
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19 elseif sep == "." then
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20 proto = "IPv4"
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21 end
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22 if not proto then
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23 return nil, "invalid address";
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24 end
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25 elseif proto ~= "IPv4" and proto ~= "IPv6" then
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26 return nil, "invalid protocol";
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27 end
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28 if proto == "IPv6" and ipStr:find('.', 1, true) then
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29 local changed;
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30 ipStr, changed = ipStr:gsub(":(%d+)%.(%d+)%.(%d+)%.(%d+)$", function(a,b,c,d)
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31 return (":%04X:%04X"):format(a*256+b,c*256+d);
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32 end);
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33 if changed ~= 1 then return nil, "invalid-address"; end
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34 end
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35
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36 return setmetatable({ addr = ipStr, proto = proto }, ip_mt);
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37 end
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38
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39 local function toBits(ip)
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40 local result = "";
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41 local fields = {};
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42 if ip.proto == "IPv4" then
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43 ip = ip.toV4mapped;
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44 end
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45 ip = (ip.addr):upper();
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46 ip:gsub("([^:]*):?", function (c) fields[#fields + 1] = c end);
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47 if not ip:match(":$") then fields[#fields] = nil; end
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48 for i, field in ipairs(fields) do
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49 if field:len() == 0 and i ~= 1 and i ~= #fields then
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50 for i = 1, 16 * (9 - #fields) do
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51 result = result .. "0";
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52 end
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53 else
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54 for i = 1, 4 - field:len() do
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55 result = result .. "0000";
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56 end
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57 for i = 1, field:len() do
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58 result = result .. hex2bits[field:sub(i,i)];
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59 end
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60 end
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61 end
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62 return result;
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63 end
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64
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65 local function commonPrefixLength(ipA, ipB)
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66 ipA, ipB = toBits(ipA), toBits(ipB);
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67 for i = 1, 128 do
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68 if ipA:sub(i,i) ~= ipB:sub(i,i) then
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69 return i-1;
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70 end
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71 end
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72 return 128;
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73 end
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74
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75 local function v4scope(ip)
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76 local fields = {};
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77 ip:gsub("([^.]*).?", function (c) fields[#fields + 1] = tonumber(c) end);
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78 -- Loopback:
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79 if fields[1] == 127 then
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80 return 0x2;
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81 -- Link-local unicast:
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82 elseif fields[1] == 169 and fields[2] == 254 then
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83 return 0x2;
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84 -- Global unicast:
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85 else
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86 return 0xE;
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87 end
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88 end
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89
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90 local function v6scope(ip)
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91 -- Loopback:
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92 if ip:match("^[0:]*1$") then
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93 return 0x2;
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94 -- Link-local unicast:
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95 elseif ip:match("^[Ff][Ee][89ABab]") then
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96 return 0x2;
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97 -- Site-local unicast:
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98 elseif ip:match("^[Ff][Ee][CcDdEeFf]") then
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99 return 0x5;
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100 -- Multicast:
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101 elseif ip:match("^[Ff][Ff]") then
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102 return tonumber("0x"..ip:sub(4,4));
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103 -- Global unicast:
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104 else
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105 return 0xE;
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106 end
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107 end
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108
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109 local function label(ip)
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110 if commonPrefixLength(ip, new_ip("::1", "IPv6")) == 128 then
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111 return 0;
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112 elseif commonPrefixLength(ip, new_ip("2002::", "IPv6")) >= 16 then
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113 return 2;
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114 elseif commonPrefixLength(ip, new_ip("2001::", "IPv6")) >= 32 then
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115 return 5;
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116 elseif commonPrefixLength(ip, new_ip("fc00::", "IPv6")) >= 7 then
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117 return 13;
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118 elseif commonPrefixLength(ip, new_ip("fec0::", "IPv6")) >= 10 then
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119 return 11;
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120 elseif commonPrefixLength(ip, new_ip("3ffe::", "IPv6")) >= 16 then
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121 return 12;
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122 elseif commonPrefixLength(ip, new_ip("::", "IPv6")) >= 96 then
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123 return 3;
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124 elseif commonPrefixLength(ip, new_ip("::ffff:0:0", "IPv6")) >= 96 then
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125 return 4;
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126 else
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127 return 1;
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128 end
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129 end
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130
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131 local function precedence(ip)
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132 if commonPrefixLength(ip, new_ip("::1", "IPv6")) == 128 then
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133 return 50;
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134 elseif commonPrefixLength(ip, new_ip("2002::", "IPv6")) >= 16 then
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135 return 30;
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136 elseif commonPrefixLength(ip, new_ip("2001::", "IPv6")) >= 32 then
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137 return 5;
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138 elseif commonPrefixLength(ip, new_ip("fc00::", "IPv6")) >= 7 then
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139 return 3;
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140 elseif commonPrefixLength(ip, new_ip("fec0::", "IPv6")) >= 10 then
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141 return 1;
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142 elseif commonPrefixLength(ip, new_ip("3ffe::", "IPv6")) >= 16 then
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143 return 1;
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144 elseif commonPrefixLength(ip, new_ip("::", "IPv6")) >= 96 then
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145 return 1;
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146 elseif commonPrefixLength(ip, new_ip("::ffff:0:0", "IPv6")) >= 96 then
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147 return 35;
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148 else
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149 return 40;
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150 end
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151 end
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152
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153 local function toV4mapped(ip)
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154 local fields = {};
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155 local ret = "::ffff:";
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156 ip:gsub("([^.]*).?", function (c) fields[#fields + 1] = tonumber(c) end);
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157 ret = ret .. ("%02x"):format(fields[1]);
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158 ret = ret .. ("%02x"):format(fields[2]);
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159 ret = ret .. ":"
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160 ret = ret .. ("%02x"):format(fields[3]);
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161 ret = ret .. ("%02x"):format(fields[4]);
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162 return new_ip(ret, "IPv6");
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163 end
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164
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165 function ip_methods:toV4mapped()
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166 if self.proto ~= "IPv4" then return nil, "No IPv4 address" end
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167 local value = toV4mapped(self.addr);
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168 self.toV4mapped = value;
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169 return value;
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170 end
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171
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172 function ip_methods:label()
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173 local value;
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174 if self.proto == "IPv4" then
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175 value = label(self.toV4mapped);
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176 else
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177 value = label(self);
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178 end
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179 self.label = value;
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180 return value;
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181 end
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182
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183 function ip_methods:precedence()
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184 local value;
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185 if self.proto == "IPv4" then
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186 value = precedence(self.toV4mapped);
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187 else
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188 value = precedence(self);
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189 end
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190 self.precedence = value;
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191 return value;
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192 end
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193
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194 function ip_methods:scope()
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195 local value;
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196 if self.proto == "IPv4" then
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197 value = v4scope(self.addr);
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198 else
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199 value = v6scope(self.addr);
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200 end
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201 self.scope = value;
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202 return value;
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203 end
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204
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205 return {new_ip = new_ip,
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206 commonPrefixLength = commonPrefixLength};