prosody
5aaddafe0beb
util/rfc6724.lua

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util/rfc6724.lua @ 5989:5aaddafe0beb

package{,c}path fixes for migration tools
author Vadim Misbakh-Soloviov <mva@mva.name>
date Fri, 14 Jun 2013 15:15:05 +0700
parent 5552:40e7a6cf15ff
child 7259:d8300985f2bb
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 -- Prosody IM
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2 -- Copyright (C) 2011-2013 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 -- This is used to sort destination addresses by preference
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9 -- during S2S connections.
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10 -- We can't hand this off to getaddrinfo, since it blocks
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11
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12 local ip_commonPrefixLength = require"util.ip".commonPrefixLength
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13 local new_ip = require"util.ip".new_ip;
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14
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15 local function commonPrefixLength(ipA, ipB)
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16 local len = ip_commonPrefixLength(ipA, ipB);
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17 return len < 64 and len or 64;
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18 end
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19
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20 local function t_sort(t, comp)
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21 for i = 1, (#t - 1) do
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22 for j = (i + 1), #t do
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23 local a, b = t[i], t[j];
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24 if not comp(a,b) then
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25 t[i], t[j] = b, a;
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26 end
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27 end
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28 end
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29 end
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30
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31 local function source(dest, candidates)
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32 local function comp(ipA, ipB)
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33 -- Rule 1: Prefer same address
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34 if dest == ipA then
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35 return true;
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36 elseif dest == ipB then
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37 return false;
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38 end
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39
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40 -- Rule 2: Prefer appropriate scope
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41 if ipA.scope < ipB.scope then
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42 if ipA.scope < dest.scope then
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43 return false;
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44 else
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45 return true;
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46 end
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47 elseif ipA.scope > ipB.scope then
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48 if ipB.scope < dest.scope then
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49 return true;
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50 else
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51 return false;
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52 end
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53 end
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54
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55 -- Rule 3: Avoid deprecated addresses
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56 -- XXX: No way to determine this
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57 -- Rule 4: Prefer home addresses
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58 -- XXX: Mobility Address related, no way to determine this
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59 -- Rule 5: Prefer outgoing interface
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60 -- XXX: Interface to address relation. No way to determine this
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61 -- Rule 6: Prefer matching label
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62 if ipA.label == dest.label and ipB.label ~= dest.label then
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63 return true;
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64 elseif ipB.label == dest.label and ipA.label ~= dest.label then
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65 return false;
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66 end
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67
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68 -- Rule 7: Prefer temporary addresses (over public ones)
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69 -- XXX: No way to determine this
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70 -- Rule 8: Use longest matching prefix
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71 if commonPrefixLength(ipA, dest) > commonPrefixLength(ipB, dest) then
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72 return true;
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73 else
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74 return false;
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75 end
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76 end
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77
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78 t_sort(candidates, comp);
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79 return candidates[1];
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80 end
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81
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82 local function destination(candidates, sources)
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83 local sourceAddrs = {};
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84 local function comp(ipA, ipB)
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85 local ipAsource = sourceAddrs[ipA];
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86 local ipBsource = sourceAddrs[ipB];
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87 -- Rule 1: Avoid unusable destinations
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88 -- XXX: No such information
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89 -- Rule 2: Prefer matching scope
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90 if ipA.scope == ipAsource.scope and ipB.scope ~= ipBsource.scope then
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91 return true;
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92 elseif ipA.scope ~= ipAsource.scope and ipB.scope == ipBsource.scope then
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93 return false;
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94 end
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95
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96 -- Rule 3: Avoid deprecated addresses
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97 -- XXX: No way to determine this
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98 -- Rule 4: Prefer home addresses
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99 -- XXX: Mobility Address related, no way to determine this
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100 -- Rule 5: Prefer matching label
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101 if ipAsource.label == ipA.label and ipBsource.label ~= ipB.label then
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102 return true;
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103 elseif ipBsource.label == ipB.label and ipAsource.label ~= ipA.label then
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104 return false;
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105 end
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106
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107 -- Rule 6: Prefer higher precedence
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108 if ipA.precedence > ipB.precedence then
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109 return true;
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110 elseif ipA.precedence < ipB.precedence then
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111 return false;
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112 end
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113
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114 -- Rule 7: Prefer native transport
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115 -- XXX: No way to determine this
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116 -- Rule 8: Prefer smaller scope
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117 if ipA.scope < ipB.scope then
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118 return true;
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119 elseif ipA.scope > ipB.scope then
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120 return false;
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121 end
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122
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123 -- Rule 9: Use longest matching prefix
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124 if commonPrefixLength(ipA, ipAsource) > commonPrefixLength(ipB, ipBsource) then
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125 return true;
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126 elseif commonPrefixLength(ipA, ipAsource) < commonPrefixLength(ipB, ipBsource) then
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127 return false;
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128 end
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129
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130 -- Rule 10: Otherwise, leave order unchanged
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131 return true;
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132 end
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133 for _, ip in ipairs(candidates) do
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134 sourceAddrs[ip] = source(ip, sources);
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135 end
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136
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137 t_sort(candidates, comp);
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138 return candidates;
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139 end
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140
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141 return {source = source,
4314eeeed394 util.rfc3484: New util implementing RFC3484 sorting
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142 destination = destination};