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module:set_global();
local array = require "util.array";
local max_buffer_len = module:get_option_number("multiplex_buffer_size", 1024);
local portmanager = require "core.portmanager";
local available_services = {};
local service_by_protocol = {};
local available_protocols = array();
local function add_service(service)
local multiplex_pattern = service.multiplex and service.multiplex.pattern;
local protocol_name = service.multiplex and service.multiplex.protocol;
if protocol_name then
module:log("debug", "Adding multiplex service %q with protocol %q", service.name, protocol_name);
service_by_protocol[protocol_name] = service;
available_protocols:push(protocol_name);
end
if multiplex_pattern then
module:log("debug", "Adding multiplex service %q with pattern %q", service.name, multiplex_pattern);
available_services[service] = multiplex_pattern;
elseif not protocol_name then
module:log("debug", "Service %q is not multiplex-capable", service.name);
end
end
module:hook("service-added", function (event) add_service(event.service); end);
module:hook("service-removed", function (event)
available_services[event.service] = nil;
if event.service.multiplex and event.service.multiplex.protocol then
available_protocols:filter(function (p) return p ~= event.service.multiplex.protocol end);
service_by_protocol[event.service.multiplex.protocol] = nil;
end
end);
for _, services in pairs(portmanager.get_registered_services()) do
for _, service in ipairs(services) do
add_service(service);
end
end
local buffers = {};
local listener = { default_mode = max_buffer_len };
function listener.onconnect(conn)
local sock = conn:socket();
if sock.getalpn then
local selected_proto = sock:getalpn();
local service = service_by_protocol[selected_proto];
if service then
module:log("debug", "Routing incoming connection to %s based on ALPN %q", service.name, selected_proto);
local next_listener = service.listener;
conn:setlistener(next_listener);
local onconnect = next_listener.onconnect;
if onconnect then return onconnect(conn) end
end
end
end
function listener.onincoming(conn, data)
if not data then return; end
local buf = buffers[conn];
buf = buf and buf..data or data;
for service, multiplex_pattern in pairs(available_services) do
if buf:match(multiplex_pattern) then
module:log("debug", "Routing incoming connection to %s", service.name);
local next_listener = service.listener;
conn:setlistener(next_listener);
local onconnect = next_listener.onconnect;
if onconnect then onconnect(conn) end
return next_listener.onincoming(conn, buf);
end
end
if #buf > max_buffer_len then -- Give up
conn:close();
else
buffers[conn] = buf;
end
end
function listener.ondisconnect(conn)
buffers[conn] = nil; -- warn if no buffer?
end
listener.ondetach = listener.ondisconnect;
module:provides("net", {
name = "multiplex";
config_prefix = "";
listener = listener;
});
module:provides("net", {
name = "multiplex_ssl";
config_prefix = "ssl";
encryption = "ssl";
ssl_config = {
alpn = function ()
return available_protocols;
end;
};
listener = listener;
});
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