aboutsummaryrefslogtreecommitdiffstats
path: root/util/rfc6724.lua
diff options
context:
space:
mode:
Diffstat (limited to 'util/rfc6724.lua')
-rw-r--r--util/rfc6724.lua141
1 files changed, 0 insertions, 141 deletions
diff --git a/util/rfc6724.lua b/util/rfc6724.lua
deleted file mode 100644
index 81f78d55..00000000
--- a/util/rfc6724.lua
+++ /dev/null
@@ -1,141 +0,0 @@
--- Prosody IM
--- Copyright (C) 2011-2013 Florian Zeitz
---
--- This project is MIT/X11 licensed. Please see the
--- COPYING file in the source package for more information.
---
-
--- This is used to sort destination addresses by preference
--- during S2S connections.
--- We can't hand this off to getaddrinfo, since it blocks
-
-local ip_commonPrefixLength = require"util.ip".commonPrefixLength
-
-local function commonPrefixLength(ipA, ipB)
- local len = ip_commonPrefixLength(ipA, ipB);
- return len < 64 and len or 64;
-end
-
-local function t_sort(t, comp)
- for i = 1, (#t - 1) do
- for j = (i + 1), #t do
- local a, b = t[i], t[j];
- if not comp(a,b) then
- t[i], t[j] = b, a;
- end
- end
- end
-end
-
-local function source(dest, candidates)
- local function comp(ipA, ipB)
- -- Rule 1: Prefer same address
- if dest == ipA then
- return true;
- elseif dest == ipB then
- return false;
- end
-
- -- Rule 2: Prefer appropriate scope
- if ipA.scope < ipB.scope then
- if ipA.scope < dest.scope then
- return false;
- else
- return true;
- end
- elseif ipA.scope > ipB.scope then
- if ipB.scope < dest.scope then
- return true;
- else
- return false;
- end
- end
-
- -- Rule 3: Avoid deprecated addresses
- -- XXX: No way to determine this
- -- Rule 4: Prefer home addresses
- -- XXX: Mobility Address related, no way to determine this
- -- Rule 5: Prefer outgoing interface
- -- XXX: Interface to address relation. No way to determine this
- -- Rule 6: Prefer matching label
- if ipA.label == dest.label and ipB.label ~= dest.label then
- return true;
- elseif ipB.label == dest.label and ipA.label ~= dest.label then
- return false;
- end
-
- -- Rule 7: Prefer temporary addresses (over public ones)
- -- XXX: No way to determine this
- -- Rule 8: Use longest matching prefix
- if commonPrefixLength(ipA, dest) > commonPrefixLength(ipB, dest) then
- return true;
- else
- return false;
- end
- end
-
- t_sort(candidates, comp);
- return candidates[1];
-end
-
-local function destination(candidates, sources)
- local sourceAddrs = {};
- local function comp(ipA, ipB)
- local ipAsource = sourceAddrs[ipA];
- local ipBsource = sourceAddrs[ipB];
- -- Rule 1: Avoid unusable destinations
- -- XXX: No such information
- -- Rule 2: Prefer matching scope
- if ipA.scope == ipAsource.scope and ipB.scope ~= ipBsource.scope then
- return true;
- elseif ipA.scope ~= ipAsource.scope and ipB.scope == ipBsource.scope then
- return false;
- end
-
- -- Rule 3: Avoid deprecated addresses
- -- XXX: No way to determine this
- -- Rule 4: Prefer home addresses
- -- XXX: Mobility Address related, no way to determine this
- -- Rule 5: Prefer matching label
- if ipAsource.label == ipA.label and ipBsource.label ~= ipB.label then
- return true;
- elseif ipBsource.label == ipB.label and ipAsource.label ~= ipA.label then
- return false;
- end
-
- -- Rule 6: Prefer higher precedence
- if ipA.precedence > ipB.precedence then
- return true;
- elseif ipA.precedence < ipB.precedence then
- return false;
- end
-
- -- Rule 7: Prefer native transport
- -- XXX: No way to determine this
- -- Rule 8: Prefer smaller scope
- if ipA.scope < ipB.scope then
- return true;
- elseif ipA.scope > ipB.scope then
- return false;
- end
-
- -- Rule 9: Use longest matching prefix
- if commonPrefixLength(ipA, ipAsource) > commonPrefixLength(ipB, ipBsource) then
- return true;
- elseif commonPrefixLength(ipA, ipAsource) < commonPrefixLength(ipB, ipBsource) then
- return false;
- end
-
- -- Rule 10: Otherwise, leave order unchanged
- return true;
- end
- for _, ip in ipairs(candidates) do
- sourceAddrs[ip] = source(ip, sources);
- end
-
- t_sort(candidates, comp);
- return candidates;
-end
-
-return {source = source,
- destination = destination};