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b08a46cf06e6
util/rfc3484.lua

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util/rfc3484.lua @ 4474:b08a46cf06e6

util.json: Added function encode_ordered(object).
author Waqas Hussain <waqas20@gmail.com>
date Wed, 18 Jan 2012 08:54:26 +0500
parent 4423:ded726418b16
child 4830:ea907059a90e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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4314eeeed394 util.rfc3484: New util implementing RFC3484 sorting
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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 commonPrefixLength = require"util.ip".commonPrefixLength
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9 local new_ip = require"util.ip".new_ip;
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10
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11 local function t_sort(t, comp)
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12 for i = 1, (#t - 1) do
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13 for j = (i + 1), #t do
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14 local a, b = t[i], t[j];
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15 if not comp(a,b) then
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16 t[i], t[j] = b, a;
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17 end
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18 end
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19 end
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20 end
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21
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22 function source(dest, candidates)
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23 local function comp(ipA, ipB)
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24 -- Rule 1: Prefer same address
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25 if dest == ipA then
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26 return true;
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27 elseif dest == ipB then
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28 return false;
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29 end
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30
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31 -- Rule 2: Prefer appropriate scope
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32 if ipA.scope < ipB.scope then
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33 if ipA.scope < dest.scope then
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34 return false;
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35 else
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36 return true;
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37 end
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38 elseif ipA.scope > ipB.scope then
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39 if ipB.scope < dest.scope then
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40 return true;
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41 else
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42 return false;
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43 end
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44 end
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45
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46 -- Rule 3: Avoid deprecated addresses
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47 -- XXX: No way to determine this
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48 -- Rule 4: Prefer home addresses
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49 -- XXX: Mobility Address related, no way to determine this
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50 -- Rule 5: Prefer outgoing interface
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51 -- XXX: Interface to address relation. No way to determine this
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52 -- Rule 6: Prefer matching label
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53 if ipA.label == dest.label and ipB.label ~= dest.label then
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54 return true;
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55 elseif ipB.label == dest.label and ipA.label ~= dest.label then
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56 return false;
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57 end
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58
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59 -- Rule 7: Prefer public addresses (over temporary ones)
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60 -- XXX: No way to determine this
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61 -- Rule 8: Use longest matching prefix
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62 if commonPrefixLength(ipA, dest) > commonPrefixLength(ipB, dest) then
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63 return true;
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64 else
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65 return false;
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66 end
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67 end
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68
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69 t_sort(candidates, comp);
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70 return candidates[1];
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71 end
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72
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73 function destination(candidates, sources)
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74 local sourceAddrs = {};
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75 local function comp(ipA, ipB)
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76 local ipAsource = sourceAddrs[ipA];
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77 local ipBsource = sourceAddrs[ipB];
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78 -- Rule 1: Avoid unusable destinations
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79 -- XXX: No such information
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80 -- Rule 2: Prefer matching scope
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81 if ipA.scope == ipAsource.scope and ipB.scope ~= ipBsource.scope then
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82 return true;
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83 elseif ipA.scope ~= ipAsource.scope and ipB.scope == ipBsource.scope then
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84 return false;
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85 end
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86
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87 -- Rule 3: Avoid deprecated addresses
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88 -- XXX: No way to determine this
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89 -- Rule 4: Prefer home addresses
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90 -- XXX: Mobility Address related, no way to determine this
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91 -- Rule 5: Prefer matching label
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92 if ipAsource.label == ipA.label and ipBsource.label ~= ipB.label then
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93 return true;
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94 elseif ipBsource.label == ipB.label and ipAsource.label ~= ipA.label then
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95 return false;
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96 end
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97
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98 -- Rule 6: Prefer higher precedence
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99 if ipA.precedence > ipB.precedence then
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100 return true;
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101 elseif ipA.precedence < ipB.precedence then
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102 return false;
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103 end
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104
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105 -- Rule 7: Prefer native transport
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106 -- XXX: No way to determine this
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107 -- Rule 8: Prefer smaller scope
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108 if ipA.scope < ipB.scope then
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109 return true;
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110 elseif ipA.scope > ipB.scope 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 9: Use longest matching prefix
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115 if commonPrefixLength(ipA, ipAsource) > commonPrefixLength(ipB, ipBsource) then
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116 return true;
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117 elseif commonPrefixLength(ipA, ipAsource) < commonPrefixLength(ipB, ipBsource) then
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118 return false;
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119 end
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120
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121 -- Rule 10: Otherwise, leave order unchanged
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122 return true;
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123 end
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124 for _, ip in ipairs(candidates) do
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125 sourceAddrs[ip] = source(ip, sources);
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126 end
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127
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128 t_sort(candidates, comp);
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129 return candidates;
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130 end
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131
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132 return {source = source,
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133 destination = destination};