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net.stun: Add xor-peer-address helper

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This commit is contained in:
Matthew Wild 2022-03-05 11:04:25 +00:00
parent ac06bd8c97
commit d405c11918
1 changed files with 16 additions and 0 deletions
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16
net/stun.lua
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@ -5,6 +5,7 @@ local random = require "util.random";
local struct = require "util.struct";
local bit32 = require"util.bitcompat";
local sxor = require"util.strbitop".sxor;
local new_ip = require "util.ip".new_ip;
--- Public helpers
@ -221,18 +222,33 @@ function packet_methods:_unpack_address(data, xor)
};
end
function packet_methods:_pack_address(family, addr, port, xor)
if xor then
port = bit32.bxor(port, 0x2112);
addr = sxor(addr, magic_cookie..self.transaction_id);
end
local family_port = struct.pack("x>BI2", family, port);
return family_port..addr
end
function packet_methods:get_mapped_address()
local data = self:get_attribute("mapped-address");
if not data then return; end
return self:_unpack_address(data, false);
end
function packet_methods:get_xor_mapped_address()
local data = self:get_attribute("xor-mapped-address");
if not data then return; end
return self:_unpack_address(data, true);
end
function packet_methods:add_xor_peer_address(address, port)
local parsed_ip = assert(new_ip(address));
local family = assert(addr_family_lookup[parsed_ip.proto], "Unknown IP address family: "..parsed_ip.proto);
self:add_attribute("xor-peer-address", self:_pack_address(family, parsed_ip.packed, port or 0, true));
end
function packet_methods:add_message_integrity(key)
-- Add attribute with a dummy value so we can artificially increase
-- the packet 'length'