prosody
47195f035d2f
util/ip.lua

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util/ip.lua @ 8435:47195f035d2f

util.ip: Instantiate various addresses used for comparisons once
author Kim Alvefur <zash@zash.se>
date Fri, 01 Dec 2017 02:23:57 +0100
parent 8434:ec8f37baffaa
child 8436:ab9ddfb03d4d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 net = require "util.net";
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9 local hex = require "util.hex";
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10
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11 local ip_methods = {};
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12
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13 local ip_mt = {
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14 __index = function (ip, key)
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15 return ip_methods[key](ip);
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16 end,
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17 __tostring = function (ip) return ip.addr; end,
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18 __eq = function (ipA, ipB) return ipA.addr == ipB.addr; end
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19 };
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20
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21 local hex2bits = {
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22 ["0"] = "0000", ["1"] = "0001", ["2"] = "0010", ["3"] = "0011",
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23 ["4"] = "0100", ["5"] = "0101", ["6"] = "0110", ["7"] = "0111",
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24 ["8"] = "1000", ["9"] = "1001", ["A"] = "1010", ["B"] = "1011",
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25 ["C"] = "1100", ["D"] = "1101", ["E"] = "1110", ["F"] = "1111",
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26 };
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27
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28 local function new_ip(ipStr, proto)
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29 local zone;
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30 if (not proto or proto == "IPv6") and ipStr:find('%', 1, true) then
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31 ipStr, zone = ipStr:match("^(.-)%%(.*)");
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32 end
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33
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34 local packed, err = net.pton(ipStr);
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35 if not packed then return packed, err end
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36 if proto == "IPv6" and #packed ~= 16 then
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37 return nil, "invalid-ipv6";
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38 elseif proto == "IPv4" and #packed ~= 4 then
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39 return nil, "invalid-ipv4";
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40 elseif not proto then
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41 if #packed == 16 then
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42 proto = "IPv6";
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43 elseif #packed == 4 then
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44 proto = "IPv4";
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45 else
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46 return nil, "unknown protocol";
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47 end
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48 elseif proto ~= "IPv6" and proto ~= "IPv4" then
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49 return nil, "invalid protocol";
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50 end
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51
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52 return setmetatable({ addr = ipStr, packed = packed, proto = proto, zone = zone }, ip_mt);
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53 end
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54
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55 function ip_methods:normal()
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56 return net.ntop(self.packed);
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57 end
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58
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59 function ip_methods.bits(ip)
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60 return hex.to(ip.packed):upper():gsub(".", hex2bits);
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61 end
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62
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63 function ip_methods.bits_full(ip)
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64 if ip.proto == "IPv4" then
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65 ip = ip.toV4mapped;
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66 end
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67 return ip.bits;
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68 end
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69
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70 local match;
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71
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72 local function commonPrefixLength(ipA, ipB)
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73 ipA, ipB = ipA.bits_full, ipB.bits_full;
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74 for i = 1, 128 do
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75 if ipA:sub(i,i) ~= ipB:sub(i,i) then
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76 return i-1;
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77 end
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78 end
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79 return 128;
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80 end
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81
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82 -- Instantiate once
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83 local loopback = new_ip("::1");
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84 local loopback4 = new_ip("127.0.0.0");
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85 local sixtofour = new_ip("2002::");
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86 local teredo = new_ip("2001::");
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87 local linklocal = new_ip("fe80::");
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88 local linklocal4 = new_ip("169.254.0.0");
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89 local uniquelocal = new_ip("fc00::");
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90 local sitelocal = new_ip("fec0::");
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91 local sixbone = new_ip("3ffe::");
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92 local defaultunicast = new_ip("::");
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93 local multicast = new_ip("ff00::");
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94 local ipv6mapped = new_ip("::ffff:0:0");
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95
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96 local function v4scope(ip)
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97 if match(ip, loopback4, 8) then
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98 return 0x2;
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99 elseif match(ip, linklocal4) then
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100 return 0x2;
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101 else -- Global unicast
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102 return 0xE;
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103 end
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104 end
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105
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106 local function v6scope(ip)
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107 if ip == loopback then
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108 return 0x2;
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109 elseif match(ip, linklocal, 10) then
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110 return 0x2;
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111 elseif match(ip, sitelocal, 10) then
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112 return 0x5;
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113 elseif match(ip, multicast, 10) then
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114 return ip.packed:byte(2) % 0x10;
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115 else -- Global unicast
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116 return 0xE;
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117 end
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118 end
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119
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120 local function label(ip)
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121 if ip == loopback then
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122 return 0;
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123 elseif match(ip, sixtofour, 16) then
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124 return 2;
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125 elseif match(ip, teredo, 32) then
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126 return 5;
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127 elseif match(ip, uniquelocal, 7) then
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128 return 13;
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129 elseif match(ip, sitelocal, 10) then
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130 return 11;
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131 elseif match(ip, sixbone, 16) then
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132 return 12;
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133 elseif match(ip, defaultunicast, 96) then
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134 return 3;
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135 elseif match(ip, ipv6mapped, 96) then
4419
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136 return 4;
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137 else
b1e49cc314cb util.ip: New module containing IP related functions
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parents:
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138 return 1;
b1e49cc314cb util.ip: New module containing IP related functions
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parents:
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139 end
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Florian Zeitz <florob@babelmonkeys.de>
parents:
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140 end
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
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141
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142 local function precedence(ip)
8435
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143 if ip == loopback then
4419
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144 return 50;
8435
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145 elseif match(ip, sixtofour, 16) then
4419
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146 return 30;
8435
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147 elseif match(ip, teredo, 32) then
5552
40e7a6cf15ff util.rfc{3484,6724}: Update to RFC 6724
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diff changeset
148 return 5;
8435
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diff changeset
149 elseif match(ip, uniquelocal, 7) then
5552
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parents: 4433
diff changeset
150 return 3;
8435
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diff changeset
151 elseif match(ip, sitelocal, 10) then
5552
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diff changeset
152 return 1;
8435
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diff changeset
153 elseif match(ip, sixbone, 16) then
5552
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Florian Zeitz <florob@babelmonkeys.de>
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diff changeset
154 return 1;
8435
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Kim Alvefur <zash@zash.se>
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diff changeset
155 elseif match(ip, defaultunicast, 96) then
5552
40e7a6cf15ff util.rfc{3484,6724}: Update to RFC 6724
Florian Zeitz <florob@babelmonkeys.de>
parents: 4433
diff changeset
156 return 1;
8435
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diff changeset
157 elseif match(ip, ipv6mapped, 96) then
5552
40e7a6cf15ff util.rfc{3484,6724}: Update to RFC 6724
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parents: 4433
diff changeset
158 return 35;
4419
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parents:
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159 else
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parents:
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160 return 40;
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Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
161 end
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Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
162 end
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
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163
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Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
164 function ip_methods:toV4mapped()
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165 if self.proto ~= "IPv4" then return nil, "No IPv4 address" end
8434
ec8f37baffaa util.ip: Simplify creation of IPv6-mapped IPv4 addresses
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diff changeset
166 local value = new_ip("::ffff:" .. self.normal);
4419
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167 return value;
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Florian Zeitz <florob@babelmonkeys.de>
parents:
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168 end
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parents:
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169
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Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
170 function ip_methods:label()
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parents:
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171 local value;
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172 if self.proto == "IPv4" then
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parents:
diff changeset
173 value = label(self.toV4mapped);
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parents:
diff changeset
174 else
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parents:
diff changeset
175 value = label(self);
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Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
176 end
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Florian Zeitz <florob@babelmonkeys.de>
parents:
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177 self.label = value;
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178 return value;
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Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
179 end
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Florian Zeitz <florob@babelmonkeys.de>
parents:
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180
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Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
181 function ip_methods:precedence()
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Florian Zeitz <florob@babelmonkeys.de>
parents:
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182 local value;
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Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
183 if self.proto == "IPv4" then
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
184 value = precedence(self.toV4mapped);
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Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
185 else
b1e49cc314cb util.ip: New module containing IP related functions
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parents:
diff changeset
186 value = precedence(self);
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Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
187 end
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Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
188 self.precedence = value;
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Florian Zeitz <florob@babelmonkeys.de>
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189 return value;
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Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
190 end
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
191
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Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
192 function ip_methods:scope()
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Florian Zeitz <florob@babelmonkeys.de>
parents:
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193 local value;
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
194 if self.proto == "IPv4" then
8435
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diff changeset
195 value = v4scope(self);
4419
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196 else
8435
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diff changeset
197 value = v6scope(self);
4419
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Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
198 end
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
199 self.scope = value;
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Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
200 return value;
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
201 end
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
202
8435
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diff changeset
203 local rfc1918_8 = new_ip("10.0.0.0");
47195f035d2f util.ip: Instantiate various addresses used for comparisons once
Kim Alvefur <zash@zash.se>
parents: 8434
diff changeset
204 local rfc1918_12 = new_ip("172.16.0.0");
47195f035d2f util.ip: Instantiate various addresses used for comparisons once
Kim Alvefur <zash@zash.se>
parents: 8434
diff changeset
205 local rfc1918_16 = new_ip("192.168.0.0");
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Kim Alvefur <zash@zash.se>
parents: 8434
diff changeset
206
5588
8c1a3243d16f util.ip: Add 'private' method/property to determine whether an IP address is generally expected to be internet-routeable (YMMV)
Matthew Wild <mwild1@gmail.com>
parents: 5587
diff changeset
207 function ip_methods:private()
8c1a3243d16f util.ip: Add 'private' method/property to determine whether an IP address is generally expected to be internet-routeable (YMMV)
Matthew Wild <mwild1@gmail.com>
parents: 5587
diff changeset
208 local private = self.scope ~= 0xE;
8c1a3243d16f util.ip: Add 'private' method/property to determine whether an IP address is generally expected to be internet-routeable (YMMV)
Matthew Wild <mwild1@gmail.com>
parents: 5587
diff changeset
209 if not private and self.proto == "IPv4" then
8435
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Kim Alvefur <zash@zash.se>
parents: 8434
diff changeset
210 private = match(self, rfc1918_8, 8) or match(self, rfc1918_12, 12) or match(self, rfc1918_16);
5588
8c1a3243d16f util.ip: Add 'private' method/property to determine whether an IP address is generally expected to be internet-routeable (YMMV)
Matthew Wild <mwild1@gmail.com>
parents: 5587
diff changeset
211 end
8c1a3243d16f util.ip: Add 'private' method/property to determine whether an IP address is generally expected to be internet-routeable (YMMV)
Matthew Wild <mwild1@gmail.com>
parents: 5587
diff changeset
212 self.private = private;
8c1a3243d16f util.ip: Add 'private' method/property to determine whether an IP address is generally expected to be internet-routeable (YMMV)
Matthew Wild <mwild1@gmail.com>
parents: 5587
diff changeset
213 return private;
8c1a3243d16f util.ip: Add 'private' method/property to determine whether an IP address is generally expected to be internet-routeable (YMMV)
Matthew Wild <mwild1@gmail.com>
parents: 5587
diff changeset
214 end
8c1a3243d16f util.ip: Add 'private' method/property to determine whether an IP address is generally expected to be internet-routeable (YMMV)
Matthew Wild <mwild1@gmail.com>
parents: 5587
diff changeset
215
5603
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
216 local function parse_cidr(cidr)
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
217 local bits;
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
218 local ip_len = cidr:find("/", 1, true);
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
219 if ip_len then
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
220 bits = tonumber(cidr:sub(ip_len+1, -1));
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
221 cidr = cidr:sub(1, ip_len-1);
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
222 end
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
223 return new_ip(cidr), bits;
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
224 end
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
225
8435
47195f035d2f util.ip: Instantiate various addresses used for comparisons once
Kim Alvefur <zash@zash.se>
parents: 8434
diff changeset
226 function match(ipA, ipB, bits)
5603
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
227 local common_bits = commonPrefixLength(ipA, ipB);
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
228 if bits and ipB.proto == "IPv4" then
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
229 common_bits = common_bits - 96; -- v6 mapped addresses always share these bits
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
230 end
6926
d96b2aa7a11d util.ip: Improve comparison, == doesn't necessarily handle IPv6 addresses correctly if they aren't normalized (case, ::, etc.)
Matthew Wild <mwild1@gmail.com>
parents: 5776
diff changeset
231 return common_bits >= (bits or 128);
5603
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
232 end
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
233
8429
b3562a1b1caa util.ip: Reflow module export table
Kim Alvefur <zash@zash.se>
parents: 8428
diff changeset
234 return {
b3562a1b1caa util.ip: Reflow module export table
Kim Alvefur <zash@zash.se>
parents: 8428
diff changeset
235 new_ip = new_ip,
5603
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
236 commonPrefixLength = commonPrefixLength,
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
237 parse_cidr = parse_cidr,
8429
b3562a1b1caa util.ip: Reflow module export table
Kim Alvefur <zash@zash.se>
parents: 8428
diff changeset
238 match = match,
b3562a1b1caa util.ip: Reflow module export table
Kim Alvefur <zash@zash.se>
parents: 8428
diff changeset
239 };