prosody
161411a41377
util/rfc6724.lua

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util/rfc6724.lua @ 9781:161411a41377

util.prosodyctl: Allow passing path to Lua runtime to the start() function By default the shebang is used. Being able to override it is useful in cases where the shebang does not match the configured runtime.
author Kim Alvefur <zash@zash.se>
date Thu, 10 Jan 2019 14:57:26 +0100
parent 7259:d8300985f2bb
child 12975:d10957394a3c
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
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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
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parents:
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139
4314eeeed394 util.rfc3484: New util implementing RFC3484 sorting
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140 return {source = source,
4314eeeed394 util.rfc3484: New util implementing RFC3484 sorting
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parents:
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141 destination = destination};