core/portmanager.lua
author Kim Alvefur <zash@zash.se>
Thu, 31 Jan 2013 15:48:55 +0100
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parent 5225 079e4cb23f89
child 5391 0d49a4e9963b
permissions -rw-r--r--
portmanager: Make sure foo_ports is a table
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local config = require "core.configmanager";
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local certmanager = require "core.certmanager";
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local server = require "net.server";
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local log = require "util.logger".init("portmanager");
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local multitable = require "util.multitable";
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local set = require "util.set";
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local table = table;
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local setmetatable, rawset, rawget = setmetatable, rawset, rawget;
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local type, tonumber, ipairs = type, tonumber, ipairs;
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local prosody = prosody;
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local fire_event = prosody.events.fire_event;
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module "portmanager";
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--- Config
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local default_interfaces = { "*" };
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local default_local_interfaces = { "127.0.0.1" };
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if config.get("*", "use_ipv6") then
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	table.insert(default_interfaces, "::");
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	table.insert(default_local_interfaces, "::1");
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end
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--- Private state
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-- service_name -> { service_info, ... }
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local services = setmetatable({}, { __index = function (t, k) rawset(t, k, {}); return rawget(t, k); end });
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-- service_name, interface (string), port (number)
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local active_services = multitable.new();
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--- Private helpers
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local function error_to_friendly_message(service_name, port, err)
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	local friendly_message = err;
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	if err:match(" in use") then
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		-- FIXME: Use service_name here
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		if port == 5222 or port == 5223 or port == 5269 then
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			friendly_message = "check that Prosody or another XMPP server is "
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				.."not already running and using this port";
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		elseif port == 80 or port == 81 then
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			friendly_message = "check that a HTTP server is not already using "
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				.."this port";
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		elseif port == 5280 then
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			friendly_message = "check that Prosody or a BOSH connection manager "
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				.."is not already running";
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		else
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			friendly_message = "this port is in use by another application";
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		end
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	elseif err:match("permission") then
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		friendly_message = "Prosody does not have sufficient privileges to use this port";
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	end
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	return friendly_message;
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end
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prosody.events.add_handler("item-added/net-provider", function (event)
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	local item = event.item;
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	register_service(item.name, item);
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end);
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prosody.events.add_handler("item-removed/net-provider", function (event)
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	local item = event.item;
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	unregister_service(item.name, item);
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end);
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--- Public API
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function activate(service_name)
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	local service_info = services[service_name][1];
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	if not service_info then
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		return nil, "Unknown service: "..service_name;
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	end
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	local listener = service_info.listener;
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	local config_prefix = (service_info.config_prefix or service_name).."_";
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	if config_prefix == "_" then
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		config_prefix = "";
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	end
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	local bind_interfaces = config.get("*", config_prefix.."interfaces")
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		or config.get("*", config_prefix.."interface") -- COMPAT w/pre-0.9
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		or (service_info.private and (config.get("*", "local_interfaces") or default_local_interfaces))
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		or config.get("*", "interfaces")
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		or config.get("*", "interface") -- COMPAT w/pre-0.9
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		or listener.default_interface -- COMPAT w/pre0.9
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		or default_interfaces
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	bind_interfaces = set.new(type(bind_interfaces)~="table" and {bind_interfaces} or bind_interfaces);
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	local bind_ports = config.get("*", config_prefix.."ports")
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		or service_info.default_ports
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		or {service_info.default_port
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		    or listener.default_port -- COMPAT w/pre-0.9
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		   }
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	bind_ports = set.new(type(bind_ports) ~= "table" and { bind_ports } or bind_ports );
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	local mode, ssl = listener.default_mode or "*a";
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	for interface in bind_interfaces do
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		for port in bind_ports do
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			port = tonumber(port);
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			if #active_services:search(nil, interface, port) > 0 then
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				log("error", "Multiple services configured to listen on the same port ([%s]:%d): %s, %s", interface, port, active_services:search(nil, interface, port)[1][1].service.name or "<unnamed>", service_name or "<unnamed>");
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			else
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				local err;
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				-- Create SSL context for this service/port
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				if service_info.encryption == "ssl" then
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					local ssl_config = config.get("*", config_prefix.."ssl");
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					ssl, err = certmanager.create_context(service_info.name.." port "..port, "server", ssl_config and (ssl_config[port]
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						or (ssl_config.certificate and ssl_config)));
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					if not ssl then
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						log("error", "Error binding encrypted port for %s: %s", service_info.name, error_to_friendly_message(service_name, port, err) or "unknown error");
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					end
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				end
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				if not err then
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					-- Start listening on interface+port
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					local handler, err = server.addserver(interface, port, listener, mode, ssl);
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					if not handler then
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						log("error", "Failed to open server port %d on %s, %s", port, interface, error_to_friendly_message(service_name, port, err));
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					else
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						log("debug", "Added listening service %s to [%s]:%d", service_name, interface, port);
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						active_services:add(service_name, interface, port, {
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							server = handler;
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							service = service_info;
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						});
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					end
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				end
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			end
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		end
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	end
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	log("info", "Activated service '%s'", service_name);
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	return true;
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end
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function deactivate(service_name, service_info)
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	for name, interface, port, n, active_service
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		in active_services:iter(service_name or service_info and service_info.name, nil, nil, nil) do
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		if service_info == nil or active_service.service == service_info then
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			close(interface, port);
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		end
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	end
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	log("info", "Deactivated service '%s'", service_name or service_info.name);
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end
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function register_service(service_name, service_info)
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	table.insert(services[service_name], service_info);
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	if not active_services:get(service_name) then
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		log("debug", "No active service for %s, activating...", service_name);
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		local ok, err = activate(service_name);
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		if not ok then
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			log("error", "Failed to activate service '%s': %s", service_name, err or "unknown error");
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		end
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	end
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	fire_event("service-added", { name = service_name, service = service_info });
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	return true;
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end
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function unregister_service(service_name, service_info)
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	log("debug", "Unregistering service: %s", service_name);
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	local service_info_list = services[service_name];
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	for i, service in ipairs(service_info_list) do
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		if service == service_info then
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			table.remove(service_info_list, i);
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		end
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	end
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	deactivate(nil, service_info);
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	if #service_info_list > 0 then -- Other services registered with this name
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		activate(service_name); -- Re-activate with the next available one
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	end
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	fire_event("service-removed", { name = service_name, service = service_info });
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end
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function close(interface, port)
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	local service, server = get_service_at(interface, port);
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	if not service then
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		return false, "port-not-open";
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	end
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	server:close();
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	active_services:remove(service.name, interface, port);
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	log("debug", "Removed listening service %s from [%s]:%d", service.name, interface, port);
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	return true;
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end
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function get_service_at(interface, port)
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	local data = active_services:search(nil, interface, port)[1][1];
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	return data.service, data.server;
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end
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function get_service(service_name)
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	return (services[service_name] or {})[1];
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end
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function get_active_services(...)
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	return active_services;
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end
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function get_registered_services()
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	return services;
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end
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return _M;