author | Florian Zeitz <florob@babelmonkeys.de> |
Sat, 22 Oct 2011 17:59:33 +0200 | |
changeset 4423 | 4314eeeed394 |
child 4426 | ded726418b16 |
permissions | -rw-r--r-- |
4423
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-- Prosody IM |
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2 |
-- Copyright (C) 2008-2011 Florian Zeitz |
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-- |
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-- This project is MIT/X11 licensed. Please see the |
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-- COPYING file in the source package for more information. |
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-- |
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|
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local t_sort = table.sort; |
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local commonPrefixLength = require"util.ip".commonPrefixLength |
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local new_ip = require"util.ip".new_ip; |
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|
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function source(dest, candidates) |
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local function comp(ipA, ipB) |
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-- Rule 1: Prefer same address |
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if dest == ipA then |
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return true; |
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elseif dest == ipB then |
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return false; |
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end |
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|
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-- Rule 2: Prefer appropriate scope |
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if ipA.scope < ipB.scope then |
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if ipA.scope < dest.scope then |
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return false; |
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else |
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return true; |
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end |
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elseif ipA.scope > ipB.scope then |
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if ipB.scope < dest.scope then |
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return true; |
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else |
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return false; |
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end |
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end |
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|
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-- Rule 3: Avoid deprecated addresses |
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-- XXX: No way to determine this |
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-- Rule 4: Prefer home addresses |
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-- XXX: Mobility Address related, no way to determine this |
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-- Rule 5: Prefer outgoing interface |
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-- XXX: Interface to address relation. No way to determine this |
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-- Rule 6: Prefer matching label |
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if ipA.label == dest.label and ipB.label ~= dest.label then |
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return true; |
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elseif ipB.label == dest.label and ipA.label ~= dest.label then |
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return false; |
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end |
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|
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-- Rule 7: Prefer public addresses (over temporary ones) |
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-- XXX: No way to determine this |
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-- Rule 8: Use longest matching prefix |
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if commonPrefixLength(ipA, dest) > commonPrefixLength(ipB, dest) then |
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return true; |
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else |
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return false; |
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end |
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end |
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|
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t_sort(candidates, comp); |
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return candidates[1]; |
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end |
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|
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function destination(candidates, sources) |
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local t_sort = table.sort; |
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local sourceAddrs = {}; |
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local function comp(ipA, ipB) |
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local ipAsource = sourceAddrs[ipA]; |
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local ipBsource = sourceAddrs[ipB]; |
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-- Rule 1: Avoid unusable destinations |
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-- XXX: No such information |
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-- Rule 2: Prefer matching scope |
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if ipA.scope == ipAsource.scope and ipB.scope ~= ipBsource.scope then |
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return true; |
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elseif ipA.scope ~= ipAsource.scope and ipB.scope == ipBsource.scope then |
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return false; |
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end |
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|
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-- Rule 3: Avoid deprecated addresses |
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-- XXX: No way to determine this |
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-- Rule 4: Prefer home addresses |
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-- XXX: Mobility Address related, no way to determine this |
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-- Rule 5: Prefer matching label |
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if ipAsource.label == ipA.label and ipBsource.label ~= ipB.label then |
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return true; |
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elseif ipBsource.label == ipB.label and ipAsource.label ~= ipA.label then |
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return false; |
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end |
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|
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-- Rule 6: Prefer higher precedence |
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if ipA.precedence > ipB.precedence then |
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return true; |
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elseif ipA.precedence < ipB.precedence then |
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return false; |
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end |
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|
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-- Rule 7: Prefer native transport |
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-- XXX: No way to determine this |
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-- Rule 8: Prefer smaller scope |
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if ipA.scope < ipB.scope then |
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return true; |
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elseif ipA.scope > ipB.scope then |
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return false; |
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end |
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|
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-- Rule 9: Use longest matching prefix |
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if commonPrefixLength(ipA, ipAsource) > commonPrefixLength(ipB, ipBsource) then |
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return true; |
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elseif commonPrefixLength(ipA, ipAsource) < commonPrefixLength(ipB, ipBsource) then |
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return false; |
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end |
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|
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-- Rule 10: Otherwise, leave order unchanged |
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return true; |
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end |
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for _, ip in ipairs(candidates) do |
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sourceAddrs[ip] = source(ip, sources); |
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end |
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|
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t_sort(candidates, comp); |
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Florian Zeitz <florob@babelmonkeys.de>
parents:
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120 |
return candidates; |
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util.rfc3484: New util implementing RFC3484 sorting
Florian Zeitz <florob@babelmonkeys.de>
parents:
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changeset
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121 |
end |
4314eeeed394
util.rfc3484: New util implementing RFC3484 sorting
Florian Zeitz <florob@babelmonkeys.de>
parents:
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changeset
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122 |
|
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util.rfc3484: New util implementing RFC3484 sorting
Florian Zeitz <florob@babelmonkeys.de>
parents:
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changeset
|
123 |
return {source = source, |
4314eeeed394
util.rfc3484: New util implementing RFC3484 sorting
Florian Zeitz <florob@babelmonkeys.de>
parents:
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changeset
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124 |
destination = destination}; |