prosody
e108c3f97f26
util/ip.lua

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util/ip.lua @ 5587:e108c3f97f26

util.ip: Automatically determine protocol of IP address if none specified. Return error if invalid.
author Matthew Wild <mwild1@gmail.com>
date Fri, 17 May 2013 14:52:52 +0100
parent 5552:40e7a6cf15ff
child 5588:8c1a3243d16f
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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 not proto then
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16 local sep = ipStr:match("^%x+(.)");
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17 if sep == ":" then proto = "IPv6"
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18 elseif sep == "." then proto = "IPv4"
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19 end
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20 if not proto then
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21 return nil, "invalid address";
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22 end
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23 elseif proto ~= "IPv4" and proto ~= "IPv6" then
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24 return nil, "invalid protocol";
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25 end
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26
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27 return setmetatable({ addr = ipStr, proto = proto }, ip_mt);
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28 end
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29
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30 local function toBits(ip)
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31 local result = "";
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32 local fields = {};
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33 if ip.proto == "IPv4" then
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34 ip = ip.toV4mapped;
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35 end
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36 ip = (ip.addr):upper();
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37 ip:gsub("([^:]*):?", function (c) fields[#fields + 1] = c end);
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38 if not ip:match(":$") then fields[#fields] = nil; end
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39 for i, field in ipairs(fields) do
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40 if field:len() == 0 and i ~= 1 and i ~= #fields then
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41 for i = 1, 16 * (9 - #fields) do
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42 result = result .. "0";
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43 end
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44 else
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45 for i = 1, 4 - field:len() do
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46 result = result .. "0000";
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47 end
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48 for i = 1, field:len() do
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49 result = result .. hex2bits[field:sub(i,i)];
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50 end
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51 end
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52 end
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53 return result;
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54 end
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55
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56 local function commonPrefixLength(ipA, ipB)
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57 ipA, ipB = toBits(ipA), toBits(ipB);
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58 for i = 1, 128 do
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59 if ipA:sub(i,i) ~= ipB:sub(i,i) then
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60 return i-1;
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61 end
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62 end
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63 return 128;
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64 end
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65
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66 local function v4scope(ip)
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67 local fields = {};
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68 ip:gsub("([^.]*).?", function (c) fields[#fields + 1] = tonumber(c) end);
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69 -- Loopback:
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70 if fields[1] == 127 then
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71 return 0x2;
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72 -- Link-local unicast:
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73 elseif fields[1] == 169 and fields[2] == 254 then
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74 return 0x2;
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75 -- Global unicast:
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76 else
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77 return 0xE;
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78 end
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79 end
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80
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81 local function v6scope(ip)
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82 -- Loopback:
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83 if ip:match("^[0:]*1$") then
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84 return 0x2;
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85 -- Link-local unicast:
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86 elseif ip:match("^[Ff][Ee][89ABab]") then
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87 return 0x2;
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88 -- Site-local unicast:
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89 elseif ip:match("^[Ff][Ee][CcDdEeFf]") then
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90 return 0x5;
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91 -- Multicast:
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92 elseif ip:match("^[Ff][Ff]") then
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93 return tonumber("0x"..ip:sub(4,4));
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94 -- Global unicast:
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95 else
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96 return 0xE;
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97 end
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98 end
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99
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100 local function label(ip)
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101 if commonPrefixLength(ip, new_ip("::1", "IPv6")) == 128 then
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102 return 0;
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103 elseif commonPrefixLength(ip, new_ip("2002::", "IPv6")) >= 16 then
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104 return 2;
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105 elseif commonPrefixLength(ip, new_ip("2001::", "IPv6")) >= 32 then
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106 return 5;
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107 elseif commonPrefixLength(ip, new_ip("fc00::", "IPv6")) >= 7 then
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108 return 13;
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109 elseif commonPrefixLength(ip, new_ip("fec0::", "IPv6")) >= 10 then
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110 return 11;
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111 elseif commonPrefixLength(ip, new_ip("3ffe::", "IPv6")) >= 16 then
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112 return 12;
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113 elseif commonPrefixLength(ip, new_ip("::", "IPv6")) >= 96 then
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114 return 3;
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115 elseif commonPrefixLength(ip, new_ip("::ffff:0:0", "IPv6")) >= 96 then
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116 return 4;
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117 else
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118 return 1;
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119 end
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120 end
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121
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122 local function precedence(ip)
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123 if commonPrefixLength(ip, new_ip("::1", "IPv6")) == 128 then
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124 return 50;
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125 elseif commonPrefixLength(ip, new_ip("2002::", "IPv6")) >= 16 then
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126 return 30;
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127 elseif commonPrefixLength(ip, new_ip("2001::", "IPv6")) >= 32 then
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128 return 5;
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129 elseif commonPrefixLength(ip, new_ip("fc00::", "IPv6")) >= 7 then
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130 return 3;
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131 elseif commonPrefixLength(ip, new_ip("fec0::", "IPv6")) >= 10 then
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132 return 1;
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133 elseif commonPrefixLength(ip, new_ip("3ffe::", "IPv6")) >= 16 then
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134 return 1;
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135 elseif commonPrefixLength(ip, new_ip("::", "IPv6")) >= 96 then
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136 return 1;
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137 elseif commonPrefixLength(ip, new_ip("::ffff:0:0", "IPv6")) >= 96 then
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138 return 35;
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139 else
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140 return 40;
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141 end
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142 end
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143
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144 local function toV4mapped(ip)
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145 local fields = {};
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146 local ret = "::ffff:";
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147 ip:gsub("([^.]*).?", function (c) fields[#fields + 1] = tonumber(c) end);
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148 ret = ret .. ("%02x"):format(fields[1]);
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149 ret = ret .. ("%02x"):format(fields[2]);
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150 ret = ret .. ":"
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151 ret = ret .. ("%02x"):format(fields[3]);
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152 ret = ret .. ("%02x"):format(fields[4]);
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153 return new_ip(ret, "IPv6");
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154 end
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155
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156 function ip_methods:toV4mapped()
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157 if self.proto ~= "IPv4" then return nil, "No IPv4 address" end
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158 local value = toV4mapped(self.addr);
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159 self.toV4mapped = value;
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160 return value;
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161 end
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162
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163 function ip_methods:label()
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164 local value;
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165 if self.proto == "IPv4" then
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166 value = label(self.toV4mapped);
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167 else
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168 value = label(self);
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169 end
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170 self.label = value;
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171 return value;
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172 end
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173
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174 function ip_methods:precedence()
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175 local value;
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176 if self.proto == "IPv4" then
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177 value = precedence(self.toV4mapped);
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178 else
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179 value = precedence(self);
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180 end
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181 self.precedence = value;
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182 return value;
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183 end
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184
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185 function ip_methods:scope()
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186 local value;
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187 if self.proto == "IPv4" then
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188 value = v4scope(self.addr);
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189 else
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190 value = v6scope(self.addr);
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191 end
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192 self.scope = value;
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193 return value;
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194 end
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195
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196 return {new_ip = new_ip,
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197 commonPrefixLength = commonPrefixLength};