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-rw-r--r--net/stun.lua31
1 files changed, 15 insertions, 16 deletions
diff --git a/net/stun.lua b/net/stun.lua
index f028b2fc..3b1d227c 100644
--- a/net/stun.lua
+++ b/net/stun.lua
@@ -34,6 +34,15 @@ local packet_mt = { __index = packet_methods };
local magic_cookie = string.char(0x21, 0x12, 0xA4, 0x42);
+local function lookup_table(t)
+ local lookup = {};
+ for k, v in pairs(t) do
+ lookup[k] = v;
+ lookup[v] = k;
+ end
+ return lookup;
+end
+
local methods = {
binding = 0x001;
-- TURN
@@ -44,11 +53,7 @@ local methods = {
["create-permission"] = 0x008;
["channel-bind"] = 0x009;
};
-local method_lookup = {};
-for name, value in pairs(methods) do
- method_lookup[name] = value;
- method_lookup[value] = name;
-end
+local method_lookup = lookup_table(methods);
local classes = {
request = 0;
@@ -56,11 +61,10 @@ local classes = {
success = 2;
error = 3;
};
-local class_lookup = {};
-for name, value in pairs(classes) do
- class_lookup[name] = value;
- class_lookup[value] = name;
-end
+local class_lookup = lookup_table(classes);
+
+local addr_families = { "IPv4", "IPv6" };
+local addr_family_lookup = lookup_table(addr_families);
local attributes = {
["mapped-address"] = 0x0001;
@@ -83,11 +87,7 @@ local attributes = {
-- TURN
["requested-transport"] = 0x0019;
};
-local attribute_lookup = {};
-for name, value in pairs(attributes) do
- attribute_lookup[name] = value;
- attribute_lookup[value] = name;
-end
+local attribute_lookup = lookup_table(attributes);
function packet_methods:serialize_header(length)
assert(#self.transaction_id == 12, "invalid transaction id length");
@@ -204,7 +204,6 @@ function packet_methods:get_attribute(attr_type)
end
end
-local addr_families = { "IPv4", "IPv6" };
function packet_methods:get_mapped_address()
local data = self:get_attribute("mapped-address");
if not data then return; end