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Merge 13.0->trunk
author | Matthew Wild <mwild1@gmail.com> |
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date | Mon, 17 Feb 2025 23:06:26 +0000 |
parent | 13431:4698f1e36e02 |
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 net = require "prosody.util.net"; |
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9 local strbit = require "prosody.util.strbitop"; |
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10 |
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11 local ip_methods = {}; |
8428 | 12 |
13 local ip_mt = { | |
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; |
8428 | 20 end, |
21 __tostring = function (ip) return ip.addr; end, | |
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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31 local function new_ip(ipStr, proto) |
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32 local zone; |
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33 if (not proto or proto == "IPv6") and ipStr:find('%', 1, true) then |
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34 ipStr, zone = ipStr:match("^(.-)%%(.*)"); |
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35 end |
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36 |
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37 local packed, err = net.pton(ipStr); |
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38 if not packed then return packed, err end |
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39 if proto == "IPv6" and #packed ~= 16 then |
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40 return nil, "invalid-ipv6"; |
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41 elseif proto == "IPv4" and #packed ~= 4 then |
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42 return nil, "invalid-ipv4"; |
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43 elseif not proto then |
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44 if #packed == 16 then |
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45 proto = "IPv6"; |
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46 elseif #packed == 4 then |
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47 proto = "IPv4"; |
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48 else |
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49 return nil, "unknown protocol"; |
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50 end |
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51 elseif proto ~= "IPv6" and proto ~= "IPv4" then |
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52 return nil, "invalid protocol"; |
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53 end |
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54 |
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55 return setmetatable({ addr = ipStr, packed = packed, proto = proto, zone = zone }, ip_mt); |
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56 end |
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57 |
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58 function ip_methods:normal() |
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59 return net.ntop(self.packed); |
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60 end |
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61 |
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62 -- Returns the longest packed representation, i.e. IPv4 will be mapped |
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63 function ip_methods.packed_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.packed; |
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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 return strbit.common_prefix_bits(ipA.packed_full, ipB.packed_full); |
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74 end |
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75 |
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76 -- Instantiate once |
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77 local loopback = new_ip("::1"); |
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78 local loopback4 = new_ip("127.0.0.0"); |
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79 local sixtofour = new_ip("2002::"); |
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80 local teredo = new_ip("2001::"); |
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81 local linklocal = new_ip("fe80::"); |
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82 local linklocal4 = new_ip("169.254.0.0"); |
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83 local uniquelocal = new_ip("fc00::"); |
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84 local sitelocal = new_ip("fec0::"); |
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85 local sixbone = new_ip("3ffe::"); |
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86 local defaultunicast = new_ip("::"); |
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87 local multicast = new_ip("ff00::"); |
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88 local ipv6mapped = new_ip("::ffff:0:0"); |
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89 |
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90 local function v4scope(ip) |
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91 if match(ip, loopback4, 8) then |
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92 return 0x2; |
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93 elseif match(ip, linklocal4, 16) then |
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94 return 0x2; |
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95 else -- Global unicast |
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96 return 0xE; |
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97 end |
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98 end |
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99 |
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100 local function v6scope(ip) |
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101 if ip == loopback then |
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102 return 0x2; |
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103 elseif match(ip, linklocal, 10) then |
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104 return 0x2; |
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105 elseif match(ip, sitelocal, 10) then |
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106 return 0x5; |
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107 elseif match(ip, multicast, 10) then |
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108 return ip.packed:byte(2) % 0x10; |
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109 else -- Global unicast |
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110 return 0xE; |
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111 end |
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112 end |
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113 |
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114 local function label(ip) |
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115 if ip == loopback then |
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116 return 0; |
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117 elseif match(ip, sixtofour, 16) then |
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118 return 2; |
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119 elseif match(ip, teredo, 32) then |
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120 return 5; |
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121 elseif match(ip, uniquelocal, 7) then |
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122 return 13; |
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123 elseif match(ip, sitelocal, 10) then |
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124 return 11; |
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125 elseif match(ip, sixbone, 16) then |
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126 return 12; |
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127 elseif match(ip, defaultunicast, 96) then |
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128 return 3; |
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129 elseif match(ip, ipv6mapped, 96) then |
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130 return 4; |
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131 else |
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132 return 1; |
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133 end |
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134 end |
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135 |
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136 local function precedence(ip) |
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137 if ip == loopback then |
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138 return 50; |
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139 elseif match(ip, sixtofour, 16) then |
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140 return 30; |
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141 elseif match(ip, teredo, 32) then |
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142 return 5; |
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143 elseif match(ip, uniquelocal, 7) then |
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144 return 3; |
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145 elseif match(ip, sitelocal, 10) then |
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146 return 1; |
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147 elseif match(ip, sixbone, 16) then |
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148 return 1; |
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149 elseif match(ip, defaultunicast, 96) then |
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150 return 1; |
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151 elseif match(ip, ipv6mapped, 96) then |
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152 return 35; |
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153 else |
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154 return 40; |
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155 end |
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156 end |
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157 |
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158 function ip_methods:toV4mapped() |
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159 if self.proto ~= "IPv4" then return nil, "No IPv4 address" end |
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160 local value = new_ip("::ffff:" .. self.normal); |
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161 return value; |
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162 end |
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163 |
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164 function ip_methods:label() |
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165 if self.proto == "IPv4" then |
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166 return label(self.toV4mapped); |
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167 else |
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168 return label(self); |
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169 end |
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170 end |
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171 |
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172 function ip_methods:precedence() |
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173 if self.proto == "IPv4" then |
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174 return precedence(self.toV4mapped); |
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175 else |
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176 return precedence(self); |
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177 end |
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178 end |
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179 |
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180 function ip_methods:scope() |
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181 if self.proto == "IPv4" then |
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182 return v4scope(self); |
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183 else |
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184 return v6scope(self); |
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185 end |
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186 end |
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187 |
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188 local rfc1918_8 = new_ip("10.0.0.0"); |
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189 local rfc1918_12 = new_ip("172.16.0.0"); |
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190 local rfc1918_16 = new_ip("192.168.0.0"); |
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191 local rfc6598 = new_ip("100.64.0.0"); |
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192 |
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193 function ip_methods:private() |
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194 local private = self.scope ~= 0xE; |
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195 if not private and self.proto == "IPv4" then |
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196 return match(self, rfc1918_8, 8) or match(self, rfc1918_12, 12) or match(self, rfc1918_16, 16) or match(self, rfc6598, 10); |
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197 end |
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198 return private; |
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199 end |
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200 |
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201 local function parse_cidr(cidr) |
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202 local bits; |
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203 local ip_len = cidr:find("/", 1, true); |
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204 if ip_len then |
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205 bits = tonumber(cidr:sub(ip_len+1, -1)); |
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206 cidr = cidr:sub(1, ip_len-1); |
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207 end |
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208 return new_ip(cidr), bits; |
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209 end |
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210 |
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211 function match(ipA, ipB, bits) |
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212 if not bits or bits >= 128 or ipB.proto == "IPv4" and bits >= 32 then |
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213 return ipA == ipB; |
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214 elseif bits < 1 then |
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215 return true; |
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216 end |
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217 if ipA.proto ~= ipB.proto then |
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218 if ipA.proto == "IPv4" then |
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219 ipA = ipA.toV4mapped; |
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220 elseif ipB.proto == "IPv4" then |
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221 ipB = ipB.toV4mapped; |
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222 bits = bits + (128 - 32); |
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223 end |
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224 end |
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225 return strbit.common_prefix_bits(ipA.packed, ipB.packed) >= bits; |
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226 end |
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227 |
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228 local function is_ip(obj) |
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229 return getmetatable(obj) == ip_mt; |
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230 end |
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231 |
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232 local function truncate(ip, n_bits) |
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233 if n_bits % 8 ~= 0 then |
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234 return error("ip.truncate() only supports multiples of 8 bits"); |
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235 end |
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236 local n_octets = n_bits / 8; |
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237 if not is_ip(ip) then |
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238 ip = new_ip(ip); |
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239 end |
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240 return new_ip(net.ntop(ip.packed:sub(1, n_octets)..("\0"):rep(#ip.packed-n_octets))) |
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241 end |
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242 |
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243 return { |
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244 new_ip = new_ip, |
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245 commonPrefixLength = commonPrefixLength, |
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246 parse_cidr = parse_cidr, |
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247 match = match, |
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248 is_ip = is_ip; |
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249 truncate = truncate; |
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250 }; |