prosody
1c410b4f3a58
util/rfc6724.lua

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util/rfc6724.lua @ 7696:1c410b4f3a58

util.pubsub: Factor item storage cache into a per service configurable option
author Kim Alvefur <zash@zash.se>
date Sun, 16 Oct 2016 00:36:05 +0200
parent 7259:d8300985f2bb
child 12975:d10957394a3c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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
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14 local function commonPrefixLength(ipA, ipB)
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15 local len = ip_commonPrefixLength(ipA, ipB);
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16 return len < 64 and len or 64;
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17 end
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18
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19 local function t_sort(t, comp)
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20 for i = 1, (#t - 1) do
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21 for j = (i + 1), #t do
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22 local a, b = t[i], t[j];
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23 if not comp(a,b) then
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24 t[i], t[j] = b, a;
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25 end
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26 end
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27 end
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28 end
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29
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30 local function source(dest, candidates)
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31 local function comp(ipA, ipB)
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32 -- Rule 1: Prefer same address
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33 if dest == ipA then
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34 return true;
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35 elseif dest == ipB then
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36 return false;
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37 end
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38
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39 -- Rule 2: Prefer appropriate scope
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40 if ipA.scope < ipB.scope then
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41 if ipA.scope < dest.scope then
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42 return false;
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43 else
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44 return true;
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45 end
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46 elseif ipA.scope > ipB.scope then
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47 if ipB.scope < dest.scope then
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48 return true;
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49 else
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50 return false;
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51 end
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52 end
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53
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54 -- Rule 3: Avoid deprecated addresses
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55 -- XXX: No way to determine this
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56 -- Rule 4: Prefer home addresses
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57 -- XXX: Mobility Address related, no way to determine this
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58 -- Rule 5: Prefer outgoing interface
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59 -- XXX: Interface to address relation. No way to determine this
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60 -- Rule 6: Prefer matching label
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61 if ipA.label == dest.label and ipB.label ~= dest.label then
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62 return true;
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63 elseif ipB.label == dest.label and ipA.label ~= dest.label then
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64 return false;
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65 end
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66
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67 -- Rule 7: Prefer temporary addresses (over public ones)
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68 -- XXX: No way to determine this
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69 -- Rule 8: Use longest matching prefix
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70 if commonPrefixLength(ipA, dest) > commonPrefixLength(ipB, dest) then
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71 return true;
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72 else
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73 return false;
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74 end
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75 end
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76
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77 t_sort(candidates, comp);
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78 return candidates[1];
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79 end
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80
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81 local function destination(candidates, sources)
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82 local sourceAddrs = {};
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83 local function comp(ipA, ipB)
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84 local ipAsource = sourceAddrs[ipA];
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85 local ipBsource = sourceAddrs[ipB];
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86 -- Rule 1: Avoid unusable destinations
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87 -- XXX: No such information
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88 -- Rule 2: Prefer matching scope
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89 if ipA.scope == ipAsource.scope and ipB.scope ~= ipBsource.scope then
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90 return true;
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91 elseif ipA.scope ~= ipAsource.scope and ipB.scope == ipBsource.scope then
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92 return false;
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93 end
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94
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95 -- Rule 3: Avoid deprecated addresses
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96 -- XXX: No way to determine this
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97 -- Rule 4: Prefer home addresses
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98 -- XXX: Mobility Address related, no way to determine this
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99 -- Rule 5: Prefer matching label
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100 if ipAsource.label == ipA.label and ipBsource.label ~= ipB.label then
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101 return true;
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102 elseif ipBsource.label == ipB.label and ipAsource.label ~= ipA.label then
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103 return false;
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104 end
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105
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106 -- Rule 6: Prefer higher precedence
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107 if ipA.precedence > ipB.precedence then
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108 return true;
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109 elseif ipA.precedence < ipB.precedence then
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110 return false;
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111 end
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112
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113 -- Rule 7: Prefer native transport
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114 -- XXX: No way to determine this
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115 -- Rule 8: Prefer smaller scope
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116 if ipA.scope < ipB.scope then
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117 return true;
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118 elseif ipA.scope > ipB.scope then
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119 return false;
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120 end
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121
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122 -- Rule 9: Use longest matching prefix
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123 if commonPrefixLength(ipA, ipAsource) > commonPrefixLength(ipB, ipBsource) then
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124 return true;
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125 elseif commonPrefixLength(ipA, ipAsource) < commonPrefixLength(ipB, ipBsource) then
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126 return false;
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127 end
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128
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129 -- Rule 10: Otherwise, leave order unchanged
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130 return true;
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131 end
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132 for _, ip in ipairs(candidates) do
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133 sourceAddrs[ip] = source(ip, sources);
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134 end
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135
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136 t_sort(candidates, comp);
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137 return candidates;
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138 end
4314eeeed394 util.rfc3484: New util implementing RFC3484 sorting
Florian Zeitz <florob@babelmonkeys.de>
parents:
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139
4314eeeed394 util.rfc3484: New util implementing RFC3484 sorting
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
140 return {source = source,
4314eeeed394 util.rfc3484: New util implementing RFC3484 sorting
Florian Zeitz <florob@babelmonkeys.de>
parents:
diff changeset
141 destination = destination};