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util/ip.lua @ 5599:34e9f237b915
Merge 0.9->trunk
author | Kim Alvefur <zash@zash.se> |
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date | Sat, 18 May 2013 13:20:46 +0200 |
parent | 5588:8c1a3243d16f |
parent | 5597:6fe09707c73b |
child | 5603:e07f4f02e4f9 |
rev | line source |
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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 if proto == "IPv6" and ipStr:find('.', 1, true) then |
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27 local changed; |
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28 ipStr, changed = ipStr:gsub(":(%d+)%.(%d+)%.(%d+)%.(%d+)$", function(a,b,c,d) |
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29 return (":%04X:%04X"):format(a*256+b,c*256+d); |
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30 end); |
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31 if changed ~= 1 then return nil, "invalid-address"; end |
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32 end |
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33 |
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34 return setmetatable({ addr = ipStr, proto = proto }, ip_mt); |
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35 end |
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36 |
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37 local function toBits(ip) |
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38 local result = ""; |
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39 local fields = {}; |
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40 if ip.proto == "IPv4" then |
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41 ip = ip.toV4mapped; |
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42 end |
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43 ip = (ip.addr):upper(); |
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44 ip:gsub("([^:]*):?", function (c) fields[#fields + 1] = c end); |
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45 if not ip:match(":$") then fields[#fields] = nil; end |
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46 for i, field in ipairs(fields) do |
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47 if field:len() == 0 and i ~= 1 and i ~= #fields then |
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48 for i = 1, 16 * (9 - #fields) do |
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49 result = result .. "0"; |
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50 end |
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51 else |
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52 for i = 1, 4 - field:len() do |
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53 result = result .. "0000"; |
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54 end |
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55 for i = 1, field:len() do |
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56 result = result .. hex2bits[field:sub(i,i)]; |
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57 end |
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58 end |
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59 end |
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60 return result; |
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61 end |
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62 |
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63 local function commonPrefixLength(ipA, ipB) |
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64 ipA, ipB = toBits(ipA), toBits(ipB); |
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65 for i = 1, 128 do |
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66 if ipA:sub(i,i) ~= ipB:sub(i,i) then |
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67 return i-1; |
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68 end |
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69 end |
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70 return 128; |
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71 end |
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72 |
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73 local function v4scope(ip) |
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74 local fields = {}; |
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75 ip:gsub("([^.]*).?", function (c) fields[#fields + 1] = tonumber(c) end); |
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76 -- Loopback: |
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77 if fields[1] == 127 then |
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78 return 0x2; |
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79 -- Link-local unicast: |
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80 elseif fields[1] == 169 and fields[2] == 254 then |
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81 return 0x2; |
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82 -- Global unicast: |
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83 else |
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84 return 0xE; |
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85 end |
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86 end |
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87 |
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88 local function v6scope(ip) |
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89 -- Loopback: |
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90 if ip:match("^[0:]*1$") then |
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91 return 0x2; |
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92 -- Link-local unicast: |
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93 elseif ip:match("^[Ff][Ee][89ABab]") then |
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94 return 0x2; |
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95 -- Site-local unicast: |
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96 elseif ip:match("^[Ff][Ee][CcDdEeFf]") then |
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97 return 0x5; |
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98 -- Multicast: |
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99 elseif ip:match("^[Ff][Ff]") then |
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100 return tonumber("0x"..ip:sub(4,4)); |
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101 -- Global unicast: |
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102 else |
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103 return 0xE; |
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104 end |
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105 end |
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106 |
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107 local function label(ip) |
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108 if commonPrefixLength(ip, new_ip("::1", "IPv6")) == 128 then |
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109 return 0; |
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110 elseif commonPrefixLength(ip, new_ip("2002::", "IPv6")) >= 16 then |
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111 return 2; |
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112 elseif commonPrefixLength(ip, new_ip("2001::", "IPv6")) >= 32 then |
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113 return 5; |
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114 elseif commonPrefixLength(ip, new_ip("fc00::", "IPv6")) >= 7 then |
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115 return 13; |
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116 elseif commonPrefixLength(ip, new_ip("fec0::", "IPv6")) >= 10 then |
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117 return 11; |
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118 elseif commonPrefixLength(ip, new_ip("3ffe::", "IPv6")) >= 16 then |
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119 return 12; |
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120 elseif commonPrefixLength(ip, new_ip("::", "IPv6")) >= 96 then |
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121 return 3; |
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122 elseif commonPrefixLength(ip, new_ip("::ffff:0:0", "IPv6")) >= 96 then |
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123 return 4; |
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124 else |
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125 return 1; |
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126 end |
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127 end |
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128 |
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129 local function precedence(ip) |
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130 if commonPrefixLength(ip, new_ip("::1", "IPv6")) == 128 then |
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131 return 50; |
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132 elseif commonPrefixLength(ip, new_ip("2002::", "IPv6")) >= 16 then |
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133 return 30; |
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134 elseif commonPrefixLength(ip, new_ip("2001::", "IPv6")) >= 32 then |
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135 return 5; |
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136 elseif commonPrefixLength(ip, new_ip("fc00::", "IPv6")) >= 7 then |
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137 return 3; |
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138 elseif commonPrefixLength(ip, new_ip("fec0::", "IPv6")) >= 10 then |
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139 return 1; |
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140 elseif commonPrefixLength(ip, new_ip("3ffe::", "IPv6")) >= 16 then |
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141 return 1; |
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142 elseif commonPrefixLength(ip, new_ip("::", "IPv6")) >= 96 then |
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143 return 1; |
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144 elseif commonPrefixLength(ip, new_ip("::ffff:0:0", "IPv6")) >= 96 then |
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145 return 35; |
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146 else |
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147 return 40; |
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148 end |
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149 end |
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150 |
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151 local function toV4mapped(ip) |
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152 local fields = {}; |
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153 local ret = "::ffff:"; |
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154 ip:gsub("([^.]*).?", function (c) fields[#fields + 1] = tonumber(c) end); |
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155 ret = ret .. ("%02x"):format(fields[1]); |
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156 ret = ret .. ("%02x"):format(fields[2]); |
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157 ret = ret .. ":" |
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158 ret = ret .. ("%02x"):format(fields[3]); |
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159 ret = ret .. ("%02x"):format(fields[4]); |
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160 return new_ip(ret, "IPv6"); |
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161 end |
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162 |
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163 function ip_methods:toV4mapped() |
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164 if self.proto ~= "IPv4" then return nil, "No IPv4 address" end |
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165 local value = toV4mapped(self.addr); |
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166 self.toV4mapped = value; |
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167 return value; |
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168 end |
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169 |
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170 function ip_methods:label() |
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171 local value; |
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172 if self.proto == "IPv4" then |
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173 value = label(self.toV4mapped); |
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174 else |
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175 value = label(self); |
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176 end |
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177 self.label = value; |
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178 return value; |
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179 end |
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180 |
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181 function ip_methods:precedence() |
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182 local value; |
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183 if self.proto == "IPv4" then |
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184 value = precedence(self.toV4mapped); |
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185 else |
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186 value = precedence(self); |
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187 end |
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188 self.precedence = value; |
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189 return value; |
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190 end |
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191 |
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192 function ip_methods:scope() |
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193 local value; |
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194 if self.proto == "IPv4" then |
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195 value = v4scope(self.addr); |
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196 else |
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197 value = v6scope(self.addr); |
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198 end |
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199 self.scope = value; |
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200 return value; |
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201 end |
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202 |
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203 function ip_methods:private() |
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204 local private = self.scope ~= 0xE; |
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205 if not private and self.proto == "IPv4" then |
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206 local ip = self.addr; |
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207 local fields = {}; |
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208 ip:gsub("([^.]*).?", function (c) fields[#fields + 1] = tonumber(c) end); |
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209 if fields[1] == 127 or fields[1] == 10 or (fields[1] == 192 and fields[2] == 168) |
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210 or (fields[1] == 172 and (fields[2] >= 16 or fields[2] <= 32)) then |
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211 private = true; |
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212 end |
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213 end |
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214 self.private = private; |
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215 return private; |
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216 end |
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217 |
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218 return {new_ip = new_ip, |
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219 commonPrefixLength = commonPrefixLength}; |