prosody
e732f9dfdfc8
util/ip.lua

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util/ip.lua @ 13055:e732f9dfdfc8

mod_mam: port to use util.human.io.parse_duration Updated by Zash, the original patch by Jonas had put the duration parsing function in util.datetime but MattJ later did the same thing but differently in f4d7fe919969
author Jonas Schäfer <jonas@wielicki.name>
date Thu, 28 Apr 2022 20:38:40 +0200
parent 12975:d10957394a3c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 "prosody.util.net";
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9 local hex = require "prosody.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 local method = ip_methods[key];
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16 if not method then return nil; end
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17 local ret = method(ip);
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18 ip[key] = ret;
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19 return ret;
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20 end,
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21 __tostring = function (ip) return ip.addr; end,
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22 };
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23 ip_mt.__eq = function (ipA, ipB)
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24 if getmetatable(ipA) ~= ip_mt or getmetatable(ipB) ~= ip_mt then
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25 -- Lua 5.3+ calls this if both operands are tables, even if metatables differ
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26 return false;
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27 end
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28 return ipA.packed == ipB.packed;
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29 end
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30
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31 local hex2bits = {
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32 ["0"] = "0000", ["1"] = "0001", ["2"] = "0010", ["3"] = "0011",
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33 ["4"] = "0100", ["5"] = "0101", ["6"] = "0110", ["7"] = "0111",
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34 ["8"] = "1000", ["9"] = "1001", ["A"] = "1010", ["B"] = "1011",
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35 ["C"] = "1100", ["D"] = "1101", ["E"] = "1110", ["F"] = "1111",
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36 };
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37
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38 local function new_ip(ipStr, proto)
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39 local zone;
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40 if (not proto or proto == "IPv6") and ipStr:find('%', 1, true) then
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41 ipStr, zone = ipStr:match("^(.-)%%(.*)");
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42 end
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43
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44 local packed, err = net.pton(ipStr);
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45 if not packed then return packed, err end
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46 if proto == "IPv6" and #packed ~= 16 then
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47 return nil, "invalid-ipv6";
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48 elseif proto == "IPv4" and #packed ~= 4 then
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49 return nil, "invalid-ipv4";
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50 elseif not proto then
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51 if #packed == 16 then
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52 proto = "IPv6";
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53 elseif #packed == 4 then
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54 proto = "IPv4";
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55 else
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56 return nil, "unknown protocol";
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57 end
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58 elseif proto ~= "IPv6" and proto ~= "IPv4" then
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59 return nil, "invalid protocol";
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60 end
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61
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62 return setmetatable({ addr = ipStr, packed = packed, proto = proto, zone = zone }, ip_mt);
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63 end
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64
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65 function ip_methods:normal()
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66 return net.ntop(self.packed);
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67 end
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68
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69 function ip_methods.bits(ip)
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70 return hex.encode(ip.packed):upper():gsub(".", hex2bits);
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71 end
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72
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73 function ip_methods.bits_full(ip)
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74 if ip.proto == "IPv4" then
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75 ip = ip.toV4mapped;
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76 end
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77 return ip.bits;
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78 end
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79
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80 local match;
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81
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82 local function commonPrefixLength(ipA, ipB)
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83 ipA, ipB = ipA.bits_full, ipB.bits_full;
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84 for i = 1, 128 do
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85 if ipA:sub(i,i) ~= ipB:sub(i,i) then
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86 return i-1;
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87 end
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88 end
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89 return 128;
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90 end
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91
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92 -- Instantiate once
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93 local loopback = new_ip("::1");
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94 local loopback4 = new_ip("127.0.0.0");
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95 local sixtofour = new_ip("2002::");
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96 local teredo = new_ip("2001::");
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97 local linklocal = new_ip("fe80::");
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98 local linklocal4 = new_ip("169.254.0.0");
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99 local uniquelocal = new_ip("fc00::");
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100 local sitelocal = new_ip("fec0::");
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101 local sixbone = new_ip("3ffe::");
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102 local defaultunicast = new_ip("::");
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103 local multicast = new_ip("ff00::");
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104 local ipv6mapped = new_ip("::ffff:0:0");
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105
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106 local function v4scope(ip)
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107 if match(ip, loopback4, 8) then
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108 return 0x2;
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109 elseif match(ip, linklocal4, 16) then
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110 return 0x2;
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111 else -- Global unicast
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112 return 0xE;
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113 end
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114 end
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115
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116 local function v6scope(ip)
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117 if ip == loopback then
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118 return 0x2;
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119 elseif match(ip, linklocal, 10) then
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120 return 0x2;
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121 elseif match(ip, sitelocal, 10) then
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122 return 0x5;
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123 elseif match(ip, multicast, 10) then
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124 return ip.packed:byte(2) % 0x10;
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125 else -- Global unicast
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126 return 0xE;
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127 end
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128 end
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129
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130 local function label(ip)
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131 if ip == loopback then
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132 return 0;
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133 elseif match(ip, sixtofour, 16) then
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134 return 2;
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Kim Alvefur <zash@zash.se>
parents: 8434
diff changeset
135 elseif match(ip, teredo, 32) then
5552
40e7a6cf15ff util.rfc{3484,6724}: Update to RFC 6724
Florian Zeitz <florob@babelmonkeys.de>
parents: 4433
diff changeset
136 return 5;
8435
47195f035d2f util.ip: Instantiate various addresses used for comparisons once
Kim Alvefur <zash@zash.se>
parents: 8434
diff changeset
137 elseif match(ip, uniquelocal, 7) then
5552
40e7a6cf15ff util.rfc{3484,6724}: Update to RFC 6724
Florian Zeitz <florob@babelmonkeys.de>
parents: 4433
diff changeset
138 return 13;
8435
47195f035d2f util.ip: Instantiate various addresses used for comparisons once
Kim Alvefur <zash@zash.se>
parents: 8434
diff changeset
139 elseif match(ip, sitelocal, 10) then
5552
40e7a6cf15ff util.rfc{3484,6724}: Update to RFC 6724
Florian Zeitz <florob@babelmonkeys.de>
parents: 4433
diff changeset
140 return 11;
8435
47195f035d2f util.ip: Instantiate various addresses used for comparisons once
Kim Alvefur <zash@zash.se>
parents: 8434
diff changeset
141 elseif match(ip, sixbone, 16) then
5552
40e7a6cf15ff util.rfc{3484,6724}: Update to RFC 6724
Florian Zeitz <florob@babelmonkeys.de>
parents: 4433
diff changeset
142 return 12;
8435
47195f035d2f util.ip: Instantiate various addresses used for comparisons once
Kim Alvefur <zash@zash.se>
parents: 8434
diff changeset
143 elseif match(ip, defaultunicast, 96) then
4419
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
144 return 3;
8435
47195f035d2f util.ip: Instantiate various addresses used for comparisons once
Kim Alvefur <zash@zash.se>
parents: 8434
diff changeset
145 elseif match(ip, ipv6mapped, 96) then
4419
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
146 return 4;
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
147 else
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
148 return 1;
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
149 end
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
150 end
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
151
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
152 local function precedence(ip)
8435
47195f035d2f util.ip: Instantiate various addresses used for comparisons once
Kim Alvefur <zash@zash.se>
parents: 8434
diff changeset
153 if ip == loopback then
4419
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
154 return 50;
8435
47195f035d2f util.ip: Instantiate various addresses used for comparisons once
Kim Alvefur <zash@zash.se>
parents: 8434
diff changeset
155 elseif match(ip, sixtofour, 16) then
4419
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
156 return 30;
8435
47195f035d2f util.ip: Instantiate various addresses used for comparisons once
Kim Alvefur <zash@zash.se>
parents: 8434
diff changeset
157 elseif match(ip, teredo, 32) then
5552
40e7a6cf15ff util.rfc{3484,6724}: Update to RFC 6724
Florian Zeitz <florob@babelmonkeys.de>
parents: 4433
diff changeset
158 return 5;
8435
47195f035d2f util.ip: Instantiate various addresses used for comparisons once
Kim Alvefur <zash@zash.se>
parents: 8434
diff changeset
159 elseif match(ip, uniquelocal, 7) then
5552
40e7a6cf15ff util.rfc{3484,6724}: Update to RFC 6724
Florian Zeitz <florob@babelmonkeys.de>
parents: 4433
diff changeset
160 return 3;
8435
47195f035d2f util.ip: Instantiate various addresses used for comparisons once
Kim Alvefur <zash@zash.se>
parents: 8434
diff changeset
161 elseif match(ip, sitelocal, 10) then
5552
40e7a6cf15ff util.rfc{3484,6724}: Update to RFC 6724
Florian Zeitz <florob@babelmonkeys.de>
parents: 4433
diff changeset
162 return 1;
8435
47195f035d2f util.ip: Instantiate various addresses used for comparisons once
Kim Alvefur <zash@zash.se>
parents: 8434
diff changeset
163 elseif match(ip, sixbone, 16) then
5552
40e7a6cf15ff util.rfc{3484,6724}: Update to RFC 6724
Florian Zeitz <florob@babelmonkeys.de>
parents: 4433
diff changeset
164 return 1;
8435
47195f035d2f util.ip: Instantiate various addresses used for comparisons once
Kim Alvefur <zash@zash.se>
parents: 8434
diff changeset
165 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
166 return 1;
8435
47195f035d2f util.ip: Instantiate various addresses used for comparisons once
Kim Alvefur <zash@zash.se>
parents: 8434
diff changeset
167 elseif match(ip, ipv6mapped, 96) then
5552
40e7a6cf15ff util.rfc{3484,6724}: Update to RFC 6724
Florian Zeitz <florob@babelmonkeys.de>
parents: 4433
diff changeset
168 return 35;
4419
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
169 else
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
170 return 40;
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
171 end
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
172 end
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
173
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
174 function ip_methods:toV4mapped()
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
175 if self.proto ~= "IPv4" then return nil, "No IPv4 address" end
8434
ec8f37baffaa util.ip: Simplify creation of IPv6-mapped IPv4 addresses
Kim Alvefur <zash@zash.se>
parents: 8433
diff changeset
176 local value = new_ip("::ffff:" .. self.normal);
4419
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
177 return value;
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
178 end
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
179
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
180 function ip_methods:label()
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
181 if self.proto == "IPv4" then
8469
52d48cea1f60 util.ip: Remove redundant caching of method output (supposed to be done in ab9ddfb03d4d but lost somehow)
Kim Alvefur <zash@zash.se>
parents: 8468
diff changeset
182 return label(self.toV4mapped);
4419
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
183 else
8469
52d48cea1f60 util.ip: Remove redundant caching of method output (supposed to be done in ab9ddfb03d4d but lost somehow)
Kim Alvefur <zash@zash.se>
parents: 8468
diff changeset
184 return label(self);
4419
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
185 end
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
186 end
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
187
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
188 function ip_methods:precedence()
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
189 if self.proto == "IPv4" then
8469
52d48cea1f60 util.ip: Remove redundant caching of method output (supposed to be done in ab9ddfb03d4d but lost somehow)
Kim Alvefur <zash@zash.se>
parents: 8468
diff changeset
190 return precedence(self.toV4mapped);
4419
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
191 else
8469
52d48cea1f60 util.ip: Remove redundant caching of method output (supposed to be done in ab9ddfb03d4d but lost somehow)
Kim Alvefur <zash@zash.se>
parents: 8468
diff changeset
192 return precedence(self);
4419
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
193 end
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
194 end
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
195
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
196 function ip_methods:scope()
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
197 if self.proto == "IPv4" then
8469
52d48cea1f60 util.ip: Remove redundant caching of method output (supposed to be done in ab9ddfb03d4d but lost somehow)
Kim Alvefur <zash@zash.se>
parents: 8468
diff changeset
198 return v4scope(self);
4419
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
199 else
8469
52d48cea1f60 util.ip: Remove redundant caching of method output (supposed to be done in ab9ddfb03d4d but lost somehow)
Kim Alvefur <zash@zash.se>
parents: 8468
diff changeset
200 return v6scope(self);
4419
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 end
b1e49cc314cb util.ip: New module containing IP related functions
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
203
8435
47195f035d2f util.ip: Instantiate various addresses used for comparisons once
Kim Alvefur <zash@zash.se>
parents: 8434
diff changeset
204 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
205 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
206 local rfc1918_16 = new_ip("192.168.0.0");
8439
293dbb08427b util.ip: Add CGNAT network range reserved in RFC 6598
Kim Alvefur <zash@zash.se>
parents: 8438
diff changeset
207 local rfc6598 = new_ip("100.64.0.0");
8435
47195f035d2f util.ip: Instantiate various addresses used for comparisons once
Kim Alvefur <zash@zash.se>
parents: 8434
diff changeset
208
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
209 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
210 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
211 if not private and self.proto == "IPv4" then
9955
c74c89a96cbf util.ip: Add missing netmask for 192.168/16 range (fixes #1343)
Kim Alvefur <zash@zash.se>
parents: 8469
diff changeset
212 return match(self, rfc1918_8, 8) or match(self, rfc1918_12, 12) or match(self, rfc1918_16, 16) or match(self, rfc6598, 10);
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
213 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
214 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
215 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
216
5603
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
217 local function parse_cidr(cidr)
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
218 local bits;
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
219 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
220 if ip_len then
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
221 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
222 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
223 end
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
224 return new_ip(cidr), bits;
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
225 end
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
226
8435
47195f035d2f util.ip: Instantiate various addresses used for comparisons once
Kim Alvefur <zash@zash.se>
parents: 8434
diff changeset
227 function match(ipA, ipB, bits)
8438
499663bd0122 util.ip: Do exact match for longer bit counts than available
Kim Alvefur <zash@zash.se>
parents: 8437
diff changeset
228 if not bits or bits >= 128 or ipB.proto == "IPv4" and bits >= 32 then
8437
021129f7b0a3 util.ip: Do CIDR matching by comparing all bits at once instead of using O(n) function
Kim Alvefur <zash@zash.se>
parents: 8436
diff changeset
229 return ipA == ipB;
021129f7b0a3 util.ip: Do CIDR matching by comparing all bits at once instead of using O(n) function
Kim Alvefur <zash@zash.se>
parents: 8436
diff changeset
230 elseif bits < 1 then
021129f7b0a3 util.ip: Do CIDR matching by comparing all bits at once instead of using O(n) function
Kim Alvefur <zash@zash.se>
parents: 8436
diff changeset
231 return true;
5603
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
232 end
8437
021129f7b0a3 util.ip: Do CIDR matching by comparing all bits at once instead of using O(n) function
Kim Alvefur <zash@zash.se>
parents: 8436
diff changeset
233 if ipA.proto ~= ipB.proto then
021129f7b0a3 util.ip: Do CIDR matching by comparing all bits at once instead of using O(n) function
Kim Alvefur <zash@zash.se>
parents: 8436
diff changeset
234 if ipA.proto == "IPv4" then
021129f7b0a3 util.ip: Do CIDR matching by comparing all bits at once instead of using O(n) function
Kim Alvefur <zash@zash.se>
parents: 8436
diff changeset
235 ipA = ipA.toV4mapped;
021129f7b0a3 util.ip: Do CIDR matching by comparing all bits at once instead of using O(n) function
Kim Alvefur <zash@zash.se>
parents: 8436
diff changeset
236 elseif ipB.proto == "IPv4" then
8468
5bfe58539b6c util.ip: Convert the correct IP to IPv6-mapped for comparison (fixes traceback, possibly invalid result)
Kim Alvefur <zash@zash.se>
parents: 8441
diff changeset
237 ipB = ipB.toV4mapped;
8437
021129f7b0a3 util.ip: Do CIDR matching by comparing all bits at once instead of using O(n) function
Kim Alvefur <zash@zash.se>
parents: 8436
diff changeset
238 bits = bits + (128 - 32);
021129f7b0a3 util.ip: Do CIDR matching by comparing all bits at once instead of using O(n) function
Kim Alvefur <zash@zash.se>
parents: 8436
diff changeset
239 end
021129f7b0a3 util.ip: Do CIDR matching by comparing all bits at once instead of using O(n) function
Kim Alvefur <zash@zash.se>
parents: 8436
diff changeset
240 end
021129f7b0a3 util.ip: Do CIDR matching by comparing all bits at once instead of using O(n) function
Kim Alvefur <zash@zash.se>
parents: 8436
diff changeset
241 return ipA.bits:sub(1, bits) == ipB.bits:sub(1, bits);
5603
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
242 end
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
243
12931
bbae3acc6694 util.ip: Add is_ip() helper method to detect if an object is an ip object
Matthew Wild <mwild1@gmail.com>
parents: 12355
diff changeset
244 local function is_ip(obj)
bbae3acc6694 util.ip: Add is_ip() helper method to detect if an object is an ip object
Matthew Wild <mwild1@gmail.com>
parents: 12355
diff changeset
245 return getmetatable(obj) == ip_mt;
bbae3acc6694 util.ip: Add is_ip() helper method to detect if an object is an ip object
Matthew Wild <mwild1@gmail.com>
parents: 12355
diff changeset
246 end
bbae3acc6694 util.ip: Add is_ip() helper method to detect if an object is an ip object
Matthew Wild <mwild1@gmail.com>
parents: 12355
diff changeset
247
12932
9bb044705ea1 util.ip: Add ip.truncate() to return a new IP with only the prefix of another
Matthew Wild <mwild1@gmail.com>
parents: 12931
diff changeset
248 local function truncate(ip, n_bits)
9bb044705ea1 util.ip: Add ip.truncate() to return a new IP with only the prefix of another
Matthew Wild <mwild1@gmail.com>
parents: 12931
diff changeset
249 if n_bits % 8 ~= 0 then
9bb044705ea1 util.ip: Add ip.truncate() to return a new IP with only the prefix of another
Matthew Wild <mwild1@gmail.com>
parents: 12931
diff changeset
250 return error("ip.truncate() only supports multiples of 8 bits");
9bb044705ea1 util.ip: Add ip.truncate() to return a new IP with only the prefix of another
Matthew Wild <mwild1@gmail.com>
parents: 12931
diff changeset
251 end
9bb044705ea1 util.ip: Add ip.truncate() to return a new IP with only the prefix of another
Matthew Wild <mwild1@gmail.com>
parents: 12931
diff changeset
252 local n_octets = n_bits / 8;
9bb044705ea1 util.ip: Add ip.truncate() to return a new IP with only the prefix of another
Matthew Wild <mwild1@gmail.com>
parents: 12931
diff changeset
253 if not is_ip(ip) then
9bb044705ea1 util.ip: Add ip.truncate() to return a new IP with only the prefix of another
Matthew Wild <mwild1@gmail.com>
parents: 12931
diff changeset
254 ip = new_ip(ip);
9bb044705ea1 util.ip: Add ip.truncate() to return a new IP with only the prefix of another
Matthew Wild <mwild1@gmail.com>
parents: 12931
diff changeset
255 end
9bb044705ea1 util.ip: Add ip.truncate() to return a new IP with only the prefix of another
Matthew Wild <mwild1@gmail.com>
parents: 12931
diff changeset
256 return new_ip(net.ntop(ip.packed:sub(1, n_octets)..("\0"):rep(#ip.packed-n_octets)))
9bb044705ea1 util.ip: Add ip.truncate() to return a new IP with only the prefix of another
Matthew Wild <mwild1@gmail.com>
parents: 12931
diff changeset
257 end
9bb044705ea1 util.ip: Add ip.truncate() to return a new IP with only the prefix of another
Matthew Wild <mwild1@gmail.com>
parents: 12931
diff changeset
258
8429
b3562a1b1caa util.ip: Reflow module export table
Kim Alvefur <zash@zash.se>
parents: 8428
diff changeset
259 return {
b3562a1b1caa util.ip: Reflow module export table
Kim Alvefur <zash@zash.se>
parents: 8428
diff changeset
260 new_ip = new_ip,
5603
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
261 commonPrefixLength = commonPrefixLength,
e07f4f02e4f9 util.ip: Add CIDR notation parsing and matching
Matthew Wild <mwild1@gmail.com>
parents: 5599
diff changeset
262 parse_cidr = parse_cidr,
8429
b3562a1b1caa util.ip: Reflow module export table
Kim Alvefur <zash@zash.se>
parents: 8428
diff changeset
263 match = match,
12931
bbae3acc6694 util.ip: Add is_ip() helper method to detect if an object is an ip object
Matthew Wild <mwild1@gmail.com>
parents: 12355
diff changeset
264 is_ip = is_ip;
12932
9bb044705ea1 util.ip: Add ip.truncate() to return a new IP with only the prefix of another
Matthew Wild <mwild1@gmail.com>
parents: 12931
diff changeset
265 truncate = truncate;
8429
b3562a1b1caa util.ip: Reflow module export table
Kim Alvefur <zash@zash.se>
parents: 8428
diff changeset
266 };