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b1e49cc314cb
util/ip.lua

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util/ip.lua @ 4419:b1e49cc314cb

util.ip: New module containing IP related functions
author Florian Zeitz <florob@babelmonkeys.de>
date Sat, 22 Oct 2011 17:51:53 +0200
child 4432:cbc3224ed3c2
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4419
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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15 if proto ~= "IPv4" and proto ~= "IPv6" then
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16 return nil, "invalid protocol";
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17 end
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18
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19 return setmetatable({ addr = ipStr, proto = proto }, ip_mt);
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20 end
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21
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22 local function toBits(ip)
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23 local result = "";
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24 local fields = {};
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25 if ip.proto == "IPv4" then
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26 ip = ip.toV4mapped;
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27 end
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28 ip = (ip.addr):upper();
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29 ip:gsub("([^:]*):?", function (c) fields[#fields + 1] = c end);
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30 if not ip:match(":$") then fields[#fields] = nil; end
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31 for i, field in ipairs(fields) do
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32 if field:len() == 0 and i ~= 1 and i ~= #fields then
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33 for i = 1, 16 * (9 - #fields) do
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34 result = result .. "0";
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35 end
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36 else
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37 for i = 1, 4 - field:len() do
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38 result = result .. "0000";
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39 end
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40 for i = 1, field:len() do
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41 result = result .. hex2bits[field:sub(i,i)];
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42 end
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43 end
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44 end
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45 return result;
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46 end
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47
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48 local function commonPrefixLength(ipA, ipB)
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49 ipA, ipB = toBits(ipA), toBits(ipB);
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50 for i = 1, 128 do
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51 if ipA:sub(i,i) ~= ipB:sub(i,i) then
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52 return i-1;
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53 end
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54 end
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55 return 128;
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56 end
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57
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58 local function v4scope(ip)
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59 local fields = {};
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60 ip:gsub("([^.]*).?", function (c) fields[#fields + 1] = tonumber(c) end);
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61 -- Loopback:
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62 if fields[1] == 127 then
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63 return 0x2;
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64 -- Link-local unicast:
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65 elseif fields[1] == 169 and fields[2] == 254 then
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66 return 0x2;
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67 -- Site-local unicast:
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68 elseif (fields[1] == 10) or (fields[1] == 192 and fields[2] == 168) or (fields[1] == 172 and fields[2] > 16) then
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69 return 0x5;
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70 -- Global unicast:
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71 else
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72 return 0xE;
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73 end
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74 end
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75
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76 local function v6scope(ip)
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77 -- Loopback:
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78 if ip:match("^[0:]*1$") then
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79 return 0x2;
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80 -- Link-local unicast:
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81 elseif ip:match("^[Ff][Ee][89ABab]") then
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82 return 0x2;
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83 -- Site-local unicast:
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84 elseif ip:match("^[Ff][Ee][CcDdEeFf]") then
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85 return 0x5;
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86 -- Multicast:
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87 elseif ip:match("^[Ff][Ff]") then
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88 return tonumber("0x"..ip:sub(4,4));
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89 -- Global unicast:
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90 else
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91 return 0xE;
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92 end
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93 end
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94
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95 local function label(ip)
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96 if commonPrefixLength(ip, new_ip("::1", "IPv6")) == 128 then
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97 return 0;
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98 elseif commonPrefixLength(ip, new_ip("2002::", "IPv6")) >= 16 then
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99 return 2;
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100 elseif commonPrefixLength(ip, new_ip("::", "IPv6")) >= 96 then
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101 return 3;
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102 elseif commonPrefixLength(ip, new_ip("::ffff:0:0", "IPv6")) >= 96 then
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103 return 4;
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104 else
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105 return 1;
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106 end
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107 end
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108
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109 local function precedence(ip)
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110 if commonPrefixLength(ip, new_ip("::1", "IPv6")) == 128 then
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111 return 50;
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112 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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118 else
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119 return 40;
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120 end
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121 end
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122
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123 local function toV4mapped(ip)
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124 local fields = {};
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125 local ret = "::ffff:";
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126 ip:gsub("([^.]*).?", function (c) fields[#fields + 1] = tonumber(c) end);
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127 ret = ret .. ("%02x"):format(fields[1]);
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128 ret = ret .. ("%02x"):format(fields[2]);
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129 ret = ret .. ":"
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130 ret = ret .. ("%02x"):format(fields[3]);
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131 ret = ret .. ("%02x"):format(fields[4]);
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132 return new_ip(ret, "IPv6");
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133 end
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134
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135 function ip_methods:toV4mapped()
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136 if self.proto ~= "IPv4" then return nil, "No IPv4 address" end
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137 local value = toV4mapped(self.addr);
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138 self.toV4mapped = value;
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139 return value;
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140 end
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141
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142 function ip_methods:label()
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143 local value;
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144 if self.proto == "IPv4" then
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145 value = label(self.toV4mapped);
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146 else
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147 value = label(self);
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148 end
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149 self.label = value;
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150 return value;
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151 end
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152
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153 function ip_methods:precedence()
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154 local value;
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155 if self.proto == "IPv4" then
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156 value = precedence(self.toV4mapped);
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157 else
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158 value = precedence(self);
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159 end
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160 self.precedence = value;
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161 return value;
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162 end
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163
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164 function ip_methods:scope()
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165 local value;
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166 if self.proto == "IPv4" then
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167 value = v4scope(self.addr);
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168 else
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169 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};