-- Prosody IM

-- Copyright (C) 2008-2010 Matthew Wild

-- Copyright (C) 2008-2010 Waqas Hussain

--

-- This project is MIT/X11 licensed. Please see the

-- COPYING file in the source package for more information.

--

local want_pposix_version = "0.4.0";

local pposix = assert(require "util.pposix");

if pposix._VERSION ~= want_pposix_version then

	module:log("warn", "Unknown version (%s) of binary pposix module, expected %s."

		.. "Perhaps you need to recompile?", tostring(pposix._VERSION), want_pposix_version);

end

local have_signal, signal = pcall(require, "util.signal");

if not have_signal then

	module:log("warn", "Couldn't load signal library, won't respond to SIGTERM");

end

local format = require "util.format".format;

local lfs = require "lfs";

local stat = lfs.attributes;

local prosody = _G.prosody;

module:set_global(); -- we're a global module

local umask = module:get_option_string("umask", "027");

pposix.umask(umask);

-- Allow switching away from root, some people like strange ports.

module:hook("server-started", function ()

	local uid = module:get_option("setuid");

	local gid = module:get_option("setgid");

	if gid then

		local success, msg = pposix.setgid(gid);

		if success then

			module:log("debug", "Changed group to %s successfully.", gid);

		else

			module:log("error", "Failed to change group to %s. Error: %s", gid, msg);

			prosody.shutdown("Failed to change group to %s", gid);

		end

	end

	if uid then

		local success, msg = pposix.setuid(uid);

		if success then

			module:log("debug", "Changed user to %s successfully.", uid);

		else

			module:log("error", "Failed to change user to %s. Error: %s", uid, msg);

			prosody.shutdown("Failed to change user to %s", uid);

		end

	end

end);

-- Don't even think about it!

if not prosody.start_time then -- server-starting

	local suid = module:get_option("setuid");

	if not suid or suid == 0 or suid == "root" then

		if pposix.getuid() == 0 and not module:get_option_boolean("run_as_root") then

			module:log("error", "Danger, Will Robinson! Prosody doesn't need to be run as root, so don't do it!");

			module:log("error", "For more information on running Prosody as root, see https://prosody.im/doc/root");

			prosody.shutdown("Refusing to run as root");

		end

	end

end

local pidfile;

local pidfile_handle;

local function remove_pidfile()

	if pidfile_handle then

		pidfile_handle:close();

		os.remove(pidfile);

		pidfile, pidfile_handle = nil, nil;

	end

end

local function write_pidfile()

	if pidfile_handle then

		remove_pidfile();

	end

	pidfile = module:get_option_path("pidfile", nil, "data");

	if pidfile then

		local err;

		local mode = stat(pidfile) and "r+" or "w+";

		pidfile_handle, err = io.open(pidfile, mode);

		if not pidfile_handle then

			module:log("error", "Couldn't write pidfile at %s; %s", pidfile, err);

			prosody.shutdown("Couldn't write pidfile");

		else

			if not lfs.lock(pidfile_handle, "w") then -- Exclusive lock

				local other_pid = pidfile_handle:read("*a");

				module:log("error", "Another Prosody instance seems to be running with PID %s, quitting", other_pid);

				pidfile_handle = nil;

				prosody.shutdown("Prosody already running");

			else

				pidfile_handle:close();

				pidfile_handle, err = io.open(pidfile, "w+");

				if not pidfile_handle then

					module:log("error", "Couldn't write pidfile at %s; %s", pidfile, err);

					prosody.shutdown("Couldn't write pidfile");

				else

					if lfs.lock(pidfile_handle, "w") then

						pidfile_handle:write(tostring(pposix.getpid()));

						pidfile_handle:flush();

					end

				end

			end

		end

	end

end

local syslog_opened;

function syslog_sink_maker(config) -- luacheck: ignore 212/config

	if not syslog_opened then

		pposix.syslog_open("prosody", module:get_option_string("syslog_facility"));

		syslog_opened = true;

	end

	local syslog = pposix.syslog_log;

	return function (name, level, message, ...)

		syslog(level, name, format(message, ...));

	end;

end

require "core.loggingmanager".register_sink_type("syslog", syslog_sink_maker);

local daemonize = prosody.opts.daemonize;

if daemonize == nil then

	-- Fall back to config file if not specified on command-line

	daemonize = module:get_option("daemonize", prosody.installed);

end

local function remove_log_sinks()

	local lm = require "core.loggingmanager";

	lm.register_sink_type("console", nil);

	lm.register_sink_type("stdout", nil);

	lm.reload_logging();

end

if daemonize then

	local function daemonize_server()

		module:log("info", "Prosody is about to detach from the console, disabling further console output");

		remove_log_sinks();

		local ok, ret = pposix.daemonize();

		if not ok then

			module:log("error", "Failed to daemonize: %s", ret);

		elseif ret and ret > 0 then

			os.exit(0);

		else

			module:log("info", "Successfully daemonized to PID %d", pposix.getpid());

			write_pidfile();

		end

	end

	if not prosody.start_time then -- server-starting

		daemonize_server();

	end

else

	-- Not going to daemonize, so write the pid of this process

	write_pidfile();

end

module:hook("server-stopped", remove_pidfile);

-- Set signal handlers

if have_signal then

	module:add_timer(0, function ()

		signal.signal("SIGTERM", function ()

			module:log("warn", "Received SIGTERM");

			prosody.unlock_globals();

			prosody.shutdown("Received SIGTERM");

			prosody.lock_globals();

		end);

		signal.signal("SIGHUP", function ()

			module:log("info", "Received SIGHUP");

			prosody.reload_config();

			-- this also reloads logging

		end);

		signal.signal("SIGINT", function ()

			module:log("info", "Received SIGINT");

			prosody.unlock_globals();

			prosody.shutdown("Received SIGINT");

			prosody.lock_globals();

		end);

	end);

end