prosody
0.9.13
util/ip.lua

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util/ip.lua @ 8476:082d12728645 0.9.13

MUC: Rename variable to make it clearer that it is the room JID and not the MUC host
author Kim Alvefur <zash@zash.se>
date Sun, 10 Dec 2017 17:52:47 +0100
parent 7055:23de70d19e77
child 7061:eda0feeaf759
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 --
b1e49cc314cb util.ip: New module containing IP related functions
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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
306aabf2d57d util.ip: Automatically determine protocol of IP address if none specified. Return error if invalid. [Backported from 0.10]
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16 local sep = ipStr:match("^%x+(.)");
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3049137d14b6 util.ip: Fix protocol detection of IPv6 addresses beginning with : [Backported from 0.10]
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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
306aabf2d57d util.ip: Automatically determine protocol of IP address if none specified. Return error if invalid. [Backported from 0.10]
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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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23de70d19e77 util.ip: Support zone id syntax in IPv6 addresses
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28 local zone;
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29 if proto == "IPv6" and ipStr:find('%', 1, true) then
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30 ipStr, zone = ipStr:match("^(.-)%%(.*)");
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31 end
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32 if proto == "IPv6" and ipStr:find('.', 1, true) then
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33 local changed;
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34 ipStr, changed = ipStr:gsub(":(%d+)%.(%d+)%.(%d+)%.(%d+)$", function(a,b,c,d)
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35 return (":%04X:%04X"):format(a*256+b,c*256+d);
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36 end);
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37 if changed ~= 1 then return nil, "invalid-address"; end
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38 end
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39
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40 return setmetatable({ addr = ipStr, proto = proto, zone = zone }, ip_mt);
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41 end
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42
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43 local function toBits(ip)
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44 local result = "";
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45 local fields = {};
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46 if ip.proto == "IPv4" then
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47 ip = ip.toV4mapped;
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48 end
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49 ip = (ip.addr):upper();
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50 ip:gsub("([^:]*):?", function (c) fields[#fields + 1] = c end);
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51 if not ip:match(":$") then fields[#fields] = nil; end
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52 for i, field in ipairs(fields) do
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53 if field:len() == 0 and i ~= 1 and i ~= #fields then
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54 for i = 1, 16 * (9 - #fields) do
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55 result = result .. "0";
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56 end
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57 else
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58 for i = 1, 4 - field:len() do
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59 result = result .. "0000";
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60 end
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61 for i = 1, field:len() do
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62 result = result .. hex2bits[field:sub(i,i)];
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63 end
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64 end
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65 end
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66 return result;
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67 end
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68
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69 local function commonPrefixLength(ipA, ipB)
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70 ipA, ipB = toBits(ipA), toBits(ipB);
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71 for i = 1, 128 do
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72 if ipA:sub(i,i) ~= ipB:sub(i,i) then
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73 return i-1;
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74 end
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75 end
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76 return 128;
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77 end
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78
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79 local function v4scope(ip)
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80 local fields = {};
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81 ip:gsub("([^.]*).?", function (c) fields[#fields + 1] = tonumber(c) end);
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82 -- Loopback:
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83 if fields[1] == 127 then
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84 return 0x2;
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85 -- Link-local unicast:
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86 elseif fields[1] == 169 and fields[2] == 254 then
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87 return 0x2;
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88 -- Global unicast:
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89 else
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90 return 0xE;
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91 end
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92 end
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93
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94 local function v6scope(ip)
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95 -- Loopback:
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96 if ip:match("^[0:]*1$") then
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97 return 0x2;
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98 -- Link-local unicast:
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99 elseif ip:match("^[Ff][Ee][89ABab]") then
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100 return 0x2;
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101 -- Site-local unicast:
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102 elseif ip:match("^[Ff][Ee][CcDdEeFf]") then
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103 return 0x5;
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104 -- Multicast:
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105 elseif ip:match("^[Ff][Ff]") then
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106 return tonumber("0x"..ip:sub(4,4));
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107 -- Global unicast:
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108 else
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109 return 0xE;
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110 end
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111 end
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112
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113 local function label(ip)
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114 if commonPrefixLength(ip, new_ip("::1", "IPv6")) == 128 then
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115 return 0;
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116 elseif commonPrefixLength(ip, new_ip("2002::", "IPv6")) >= 16 then
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117 return 2;
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118 elseif commonPrefixLength(ip, new_ip("2001::", "IPv6")) >= 32 then
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119 return 5;
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120 elseif commonPrefixLength(ip, new_ip("fc00::", "IPv6")) >= 7 then
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121 return 13;
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122 elseif commonPrefixLength(ip, new_ip("fec0::", "IPv6")) >= 10 then
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123 return 11;
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124 elseif commonPrefixLength(ip, new_ip("3ffe::", "IPv6")) >= 16 then
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125 return 12;
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126 elseif commonPrefixLength(ip, new_ip("::", "IPv6")) >= 96 then
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127 return 3;
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128 elseif commonPrefixLength(ip, new_ip("::ffff:0:0", "IPv6")) >= 96 then
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129 return 4;
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130 else
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131 return 1;
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132 end
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133 end
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134
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135 local function precedence(ip)
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136 if commonPrefixLength(ip, new_ip("::1", "IPv6")) == 128 then
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137 return 50;
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138 elseif commonPrefixLength(ip, new_ip("2002::", "IPv6")) >= 16 then
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139 return 30;
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140 elseif commonPrefixLength(ip, new_ip("2001::", "IPv6")) >= 32 then
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141 return 5;
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142 elseif commonPrefixLength(ip, new_ip("fc00::", "IPv6")) >= 7 then
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143 return 3;
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144 elseif commonPrefixLength(ip, new_ip("fec0::", "IPv6")) >= 10 then
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145 return 1;
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146 elseif commonPrefixLength(ip, new_ip("3ffe::", "IPv6")) >= 16 then
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147 return 1;
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148 elseif commonPrefixLength(ip, new_ip("::", "IPv6")) >= 96 then
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149 return 1;
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150 elseif commonPrefixLength(ip, new_ip("::ffff:0:0", "IPv6")) >= 96 then
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151 return 35;
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152 else
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153 return 40;
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154 end
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155 end
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156
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157 local function toV4mapped(ip)
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158 local fields = {};
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159 local ret = "::ffff:";
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160 ip:gsub("([^.]*).?", function (c) fields[#fields + 1] = tonumber(c) end);
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161 ret = ret .. ("%02x"):format(fields[1]);
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162 ret = ret .. ("%02x"):format(fields[2]);
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163 ret = ret .. ":"
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164 ret = ret .. ("%02x"):format(fields[3]);
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165 ret = ret .. ("%02x"):format(fields[4]);
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166 return new_ip(ret, "IPv6");
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167 end
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168
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169 function ip_methods:toV4mapped()
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170 if self.proto ~= "IPv4" then return nil, "No IPv4 address" end
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171 local value = toV4mapped(self.addr);
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172 self.toV4mapped = value;
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173 return value;
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174 end
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175
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176 function ip_methods:label()
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177 local value;
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178 if self.proto == "IPv4" then
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179 value = label(self.toV4mapped);
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180 else
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181 value = label(self);
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182 end
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183 self.label = value;
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184 return value;
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185 end
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186
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187 function ip_methods:precedence()
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188 local value;
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189 if self.proto == "IPv4" then
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190 value = precedence(self.toV4mapped);
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191 else
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192 value = precedence(self);
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193 end
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194 self.precedence = value;
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195 return value;
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196 end
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197
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198 function ip_methods:scope()
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199 local value;
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200 if self.proto == "IPv4" then
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201 value = v4scope(self.addr);
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202 else
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203 value = v6scope(self.addr);
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204 end
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205 self.scope = value;
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206 return value;
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207 end
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208
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209 return {new_ip = new_ip,
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210 commonPrefixLength = commonPrefixLength};