File

#!/usr/bin/env lua
-- 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.
--

-- prosodyctl - command-line controller for Prosody XMPP server

-- Will be modified by configure script if run --

CFG_SOURCEDIR=os.getenv("PROSODY_SRCDIR");
CFG_CONFIGDIR=os.getenv("PROSODY_CFGDIR");
CFG_PLUGINDIR=os.getenv("PROSODY_PLUGINDIR");
CFG_DATADIR=os.getenv("PROSODY_DATADIR");

-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --

local function is_relative(path)
	local path_sep = package.config:sub(1,1);
        return ((path_sep == "/" and path:sub(1,1) ~= "/")
	or (path_sep == "\\" and (path:sub(1,1) ~= "/" and path:sub(2,3) ~= ":\\")))
end

-- Tell Lua where to find our libraries
if CFG_SOURCEDIR then
	local function filter_relative_paths(path)
		if is_relative(path) then return ""; end
	end
	local function sanitise_paths(paths)
		return (paths:gsub("[^;]+;?", filter_relative_paths):gsub(";;+", ";"));
	end
	package.path = sanitise_paths(CFG_SOURCEDIR.."/?.lua;"..package.path);
	package.cpath = sanitise_paths(CFG_SOURCEDIR.."/?.so;"..package.cpath);
end

-- Substitute ~ with path to home directory in data path
if CFG_DATADIR then
	if os.getenv("HOME") then
		CFG_DATADIR = CFG_DATADIR:gsub("^~", os.getenv("HOME"));
	end
end

-- Global 'prosody' object
local prosody = {
	hosts = {};
	events = require "util.events".new();
	platform = "posix";
	lock_globals = function () end;
	unlock_globals = function () end;
	installed = CFG_SOURCEDIR ~= nil;
};
_G.prosody = prosody;

local dependencies = require "util.dependencies";
if not dependencies.check_dependencies() then
	os.exit(1);
end

config = require "core.configmanager"

do
	local filenames = {};
	
	local filename;
	if arg[1] == "--config" and arg[2] then
		table.insert(filenames, arg[2]);
		table.remove(arg, 1); table.remove(arg, 1);
		if CFG_CONFIGDIR then
			table.insert(filenames, CFG_CONFIGDIR.."/"..arg[2]);
		end
	else
		for _, format in ipairs(config.parsers()) do
			table.insert(filenames, (CFG_CONFIGDIR or ".").."/prosody.cfg."..format);
		end
	end
	for _,_filename in ipairs(filenames) do
		filename = _filename;
		local file = io.open(filename);
		if file then
			file:close();
			CFG_CONFIGDIR = filename:match("^(.*)[\\/][^\\/]*$");
			break;
		end
	end
	local ok, level, err = config.load(filename);
	if not ok then
		print("\n");
		print("**************************");
		if level == "parser" then
			print("A problem occured while reading the config file "..(CFG_CONFIGDIR or ".").."/prosody.cfg.lua");
			local err_line, err_message = tostring(err):match("%[string .-%]:(%d*): (.*)");
			print("Error"..(err_line and (" on line "..err_line) or "")..": "..(err_message or tostring(err)));
			print("");
		elseif level == "file" then
			print("Prosody was unable to find the configuration file.");
			print("We looked for: "..(CFG_CONFIGDIR or ".").."/prosody.cfg.lua");
			print("A sample config file is included in the Prosody download called prosody.cfg.lua.dist");
			print("Copy or rename it to prosody.cfg.lua and edit as necessary.");
		end
		print("More help on configuring Prosody can be found at http://prosody.im/doc/configure");
		print("Good luck!");
		print("**************************");
		print("");
		os.exit(1);
	end
end
local original_logging_config = config.get("*", "core", "log");
config.set("*", "core", "log", { { levels = { min="info" }, to = "console" } });

local data_path = config.get("*", "core", "data_path") or CFG_DATADIR or "data";
local custom_plugin_paths = config.get("*", "core", "plugin_paths");
if custom_plugin_paths then
	local path_sep = package.config:sub(3,3);
	-- path1;path2;path3;defaultpath...
	CFG_PLUGINDIR = table.concat(custom_plugin_paths, path_sep)..path_sep..(CFG_PLUGINDIR or "plugins");
end
prosody.paths = { source = CFG_SOURCEDIR, config = CFG_CONFIGDIR, 
	          plugins = CFG_PLUGINDIR or "plugins", data = data_path };

if prosody.installed then
	-- Change working directory to data path.
	require "lfs".chdir(data_path);
end

require "core.loggingmanager"

dependencies.log_warnings();

-- Switch away from root and into the prosody user --
local switched_user, current_uid;

local want_pposix_version = "0.3.5";
local ok, pposix = pcall(require, "util.pposix");

if ok and pposix then
	if pposix._VERSION ~= want_pposix_version then print(string.format("Unknown version (%s) of binary pposix module, expected %s", tostring(pposix._VERSION), want_pposix_version)); return; end
	current_uid = pposix.getuid();
	if current_uid == 0 then
		-- We haz root!
		local desired_user = config.get("*", "core", "prosody_user") or "prosody";
		local desired_group = config.get("*", "core", "prosody_group") or desired_user;
		local ok, err = pposix.setgid(desired_group);
		if ok then
			ok, err = pposix.initgroups(desired_user);
		end
		if ok then
			ok, err = pposix.setuid(desired_user);
			if ok then
				-- Yay!
				switched_user = true;
			end
		end
		if not switched_user then
			-- Boo!
			print("Warning: Couldn't switch to Prosody user/group '"..tostring(desired_user).."'/'"..tostring(desired_group).."': "..tostring(err));
		end
	end
	
	-- Set our umask to protect data files
	pposix.umask(config.get("*", "core", "umask") or "027");
else
	print("Error: Unable to load pposix module. Check that Prosody is installed correctly.")
	print("For more help send the below error to us through http://prosody.im/discuss");
	print(tostring(pposix))
end

local function test_writeable(filename)
	local f, err = io.open(filename, "a");
	if not f then
		return false, err;
	end
	f:close();
	return true;
end

local unwriteable_files = {};
if type(original_logging_config) == "string" and original_logging_config:sub(1,1) ~= "*" then
	local ok, err = test_writeable(original_logging_config);
	if not ok then
		table.insert(unwriteable_files, err);
	end
elseif type(original_logging_config) == "table" then
	for _, rule in ipairs(original_logging_config) do
		if rule.filename then
			local ok, err = test_writeable(rule.filename);
			if not ok then
				table.insert(unwriteable_files, err);
			end
		end
	end
end

if #unwriteable_files > 0 then
	print("One of more of the Prosody log files are not");
	print("writeable, please correct the errors and try");
	print("starting prosodyctl again.");
	print("");
	for _, err in ipairs(unwriteable_files) do
		print(err);
	end
	print("");
	os.exit(1);
end


local error_messages = setmetatable({ 
		["invalid-username"] = "The given username is invalid in a Jabber ID";
		["invalid-hostname"] = "The given hostname is invalid";
		["no-password"] = "No password was supplied";
		["no-such-user"] = "The given user does not exist on the server";
		["no-such-host"] = "The given hostname does not exist in the config";
		["unable-to-save-data"] = "Unable to store, perhaps you don't have permission?";
		["no-pidfile"] = "There is no 'pidfile' option in the configuration file, see http://prosody.im/doc/prosodyctl#pidfile for help";
		["no-posix"] = "The mod_posix module is not enabled in the Prosody config file, see http://prosody.im/doc/prosodyctl for more info";
		["no-such-method"] = "This module has no commands";
		["not-running"] = "Prosody is not running";
		}, { __index = function (t,k) return "Error: "..(tostring(k):gsub("%-", " "):gsub("^.", string.upper)); end });

hosts = prosody.hosts;

local function make_host(hostname)
	return {
		type = "local",
		events = prosody.events,
		users = require "core.usermanager".new_null_provider(hostname)
	};
end

for hostname, config in pairs(config.getconfig()) do
	hosts[hostname] = make_host(hostname);
end
	
local modulemanager = require "core.modulemanager"

local prosodyctl = require "util.prosodyctl"
require "socket"
-----------------------

 -- FIXME: Duplicate code waiting for util.startup
function read_version()
	-- Try to determine version
	local version_file = io.open((CFG_SOURCEDIR or ".").."/prosody.version");
	if version_file then
		prosody.version = version_file:read("*a"):gsub("%s*$", "");
		version_file:close();
		if #prosody.version == 12 and prosody.version:match("^[a-f0-9]+$") then
			prosody.version = "hg:"..prosody.version;
		end
	else
		prosody.version = "unknown";
	end
end

local show_message, show_warning = prosodyctl.show_message, prosodyctl.show_warning;
local show_usage = prosodyctl.show_usage;
local getchar, getpass = prosodyctl.getchar, prosodyctl.getpass;
local show_yesno = prosodyctl.show_yesno;
local show_prompt = prosodyctl.show_prompt;
local read_password = prosodyctl.read_password;

local prosodyctl_timeout = (config.get("*", "core", "prosodyctl_timeout") or 5) * 2;
-----------------------
local commands = {};
local command = arg[1];

function commands.adduser(arg)
	if not arg[1] or arg[1] == "--help" then
		show_usage([[adduser JID]], [[Create the specified user account in Prosody]]);
		return 1;
	end
	local user, host = arg[1]:match("([^@]+)@(.+)");
	if not user and host then
		show_message [[Failed to understand JID, please supply the JID you want to create]]
		show_usage [[adduser user@host]]
		return 1;
	end
	
	if not host then
		show_message [[Please specify a JID, including a host. e.g. alice@example.com]];
		return 1;
	end
	
	if not hosts[host] then
		show_warning("The host '%s' is not listed in the configuration file (or is not enabled).", host)
		show_warning("The user will not be able to log in until this is changed.");
		hosts[host] = make_host(host);
	end
	
	if prosodyctl.user_exists{ user = user, host = host } then
		show_message [[That user already exists]];
		return 1;
	end
	
	local password = read_password();
	if not password then return 1; end
	
	local ok, msg = prosodyctl.adduser { user = user, host = host, password = password };
	
	if ok then return 0; end
	
	show_message(msg)
	return 1;
end

function commands.passwd(arg)
	if not arg[1] or arg[1] == "--help" then
		show_usage([[passwd JID]], [[Set the password for the specified user account in Prosody]]);
		return 1;
	end
	local user, host = arg[1]:match("([^@]+)@(.+)");
	if not user and host then
		show_message [[Failed to understand JID, please supply the JID you want to set the password for]]
		show_usage [[passwd user@host]]
		return 1;
	end
	
	if not host then
		show_message [[Please specify a JID, including a host. e.g. alice@example.com]];
		return 1;
	end
	
	if not hosts[host] then
		show_warning("The host '%s' is not listed in the configuration file (or is not enabled).", host)
		show_warning("The user will not be able to log in until this is changed.");
		hosts[host] = make_host(host);
	end
	
	if not prosodyctl.user_exists { user = user, host = host } then
		show_message [[That user does not exist, use prosodyctl adduser to create a new user]]
		return 1;
	end
	
	local password = read_password();
	if not password then return 1; end
	
	local ok, msg = prosodyctl.passwd { user = user, host = host, password = password };
	
	if ok then return 0; end
	
	show_message(error_messages[msg])
	return 1;
end

function commands.deluser(arg)
	if not arg[1] or arg[1] == "--help" then
		show_usage([[deluser JID]], [[Permanently remove the specified user account from Prosody]]);
		return 1;
	end
	local user, host = arg[1]:match("([^@]+)@(.+)");
	if not user and host then
		show_message [[Failed to understand JID, please supply the JID you want to set the password for]]
		show_usage [[passwd user@host]]
		return 1;
	end
	
	if not host then
		show_message [[Please specify a JID, including a host. e.g. alice@example.com]];
		return 1;
	end
	
	if not hosts[host] then
		show_warning("The host '%s' is not listed in the configuration file (or is not enabled).", host)
		show_warning("The user will not be able to log in until this is changed.");
		hosts[host] = make_host(host);
	end

	if not prosodyctl.user_exists { user = user, host = host } then
		show_message [[That user does not exist on this server]]
		return 1;
	end
	
	local ok, msg = prosodyctl.deluser { user = user, host = host };
	
	if ok then return 0; end
	
	show_message(error_messages[msg])
	return 1;
end

function commands.start(arg)
	if arg[1] == "--help" then
		show_usage([[start]], [[Start Prosody]]);
		return 1;
	end
	local ok, ret = prosodyctl.isrunning();
	if not ok then
		show_message(error_messages[ret]);
		return 1;
	end
	
	if ret then
		local ok, ret = prosodyctl.getpid();
		if not ok then
			show_message("Couldn't get running Prosody's PID");
			show_message(error_messages[ret]);
			return 1;
		end
		show_message("Prosody is already running with PID %s", ret or "(unknown)");
		return 1;
	end
	
	local ok, ret = prosodyctl.start();
	if ok then
		if config.get("*", "core", "daemonize") ~= false then
			local i=1;
			while true do
				local ok, running = prosodyctl.isrunning();
				if ok and running then
					break;
				elseif i == 5 then
					show_message("Still waiting...");
				elseif i >= prosodyctl_timeout then
					show_message("Prosody is still not running. Please give it some time or check your log files for errors.");
					return 2;
				end
				socket.sleep(0.5);
				i = i + 1;
			end
			show_message("Started");
		end
		return 0;
	end

	show_message("Failed to start Prosody");
	show_message(error_messages[ret])	
	return 1;	
end

function commands.status(arg)
	if arg[1] == "--help" then
		show_usage([[status]], [[Reports the running status of Prosody]]);
		return 1;
	end

	local ok, ret = prosodyctl.isrunning();
	if not ok then
		show_message(error_messages[ret]);
		return 1;
	end
	
	if ret then
		local ok, ret = prosodyctl.getpid();
		if not ok then
			show_message("Couldn't get running Prosody's PID");
			show_message(error_messages[ret]);
			return 1;
		end
		show_message("Prosody is running with PID %s", ret or "(unknown)");
		return 0;
	else
		show_message("Prosody is not running");
		if not switched_user and current_uid ~= 0 then
			print("\nNote:")
			print(" You will also see this if prosodyctl is not running under");
			print(" the same user account as Prosody. Try running as root (e.g. ");
			print(" with 'sudo' in front) to gain access to Prosody's real status.");
		end
		return 2
	end
	return 1;
end

function commands.stop(arg)
	if arg[1] == "--help" then
		show_usage([[stop]], [[Stop a running Prosody server]]);
		return 1;
	end

	if not prosodyctl.isrunning() then
		show_message("Prosody is not running");
		return 1;
	end
	
	local ok, ret = prosodyctl.stop();
	if ok then
		local i=1;
		while true do
			local ok, running = prosodyctl.isrunning();
			if ok and not running then
				break;
			elseif i == 5 then
				show_message("Still waiting...");
			elseif i >= prosodyctl_timeout then
				show_message("Prosody is still running. Please give it some time or check your log files for errors.");
				return 2;
			end
			socket.sleep(0.5);
			i = i + 1;
		end
		show_message("Stopped");
		return 0;
	end

	show_message(error_messages[ret]);
	return 1;
end

function commands.restart(arg)
	if arg[1] == "--help" then
		show_usage([[restart]], [[Restart a running Prosody server]]);
		return 1;
	end
	
	commands.stop(arg);
	return commands.start(arg);
end

function commands.about(arg)
	read_version();
	if arg[1] == "--help" then
		show_usage([[about]], [[Show information about this Prosody installation]]);
		return 1;
	end
	
	local array = require "util.array";
	local keys = require "util.iterators".keys;
	
	print("Prosody "..(prosody.version or "(unknown version)"));
	print("");
	print("# Prosody directories");
	print("Data directory:  ", CFG_DATADIR or "./");
	print("Plugin directory:", CFG_PLUGINDIR or "./");
	print("Config directory:", CFG_CONFIGDIR or "./");
	print("Source directory:", CFG_SOURCEDIR or "./");
	print("");
	print("# Lua environment");
	print("Lua version:             ", _G._VERSION);
	print("");
	print("Lua module search paths:");
	for path in package.path:gmatch("[^;]+") do
		print("  "..path);
	end
	print("");
	print("Lua C module search paths:");
	for path in package.cpath:gmatch("[^;]+") do
		print("  "..path);
	end
	print("");
	local luarocks_status = (pcall(require, "luarocks.loader") and "Installed ("..(luarocks.cfg.program_version or "2.x+")..")")
		or (pcall(require, "luarocks.require") and "Installed (1.x)")
		or "Not installed";
	print("LuaRocks:        ", luarocks_status);
	print("");
	print("# Lua module versions");
	local module_versions, longest_name = {}, 8;
	for name, module in pairs(package.loaded) do
		if type(module) == "table" and rawget(module, "_VERSION")
		and name ~= "_G" and not name:match("%.") then
			if #name > longest_name then
				longest_name = #name;
			end
			module_versions[name] = module._VERSION;
		end
	end
	local sorted_keys = array.collect(keys(module_versions)):sort();
	for _, name in ipairs(array.collect(keys(module_versions)):sort()) do
		print(name..":"..string.rep(" ", longest_name-#name), module_versions[name]);
	end
	print("");
end

function commands.reload(arg)
	if arg[1] == "--help" then
		show_usage([[reload]], [[Reload Prosody's configuration and re-open log files]]);
		return 1;
	end

	if not prosodyctl.isrunning() then
		show_message("Prosody is not running");
		return 1;
	end
	
	local ok, ret = prosodyctl.reload();
	if ok then
		
		show_message("Prosody log files re-opened and config file reloaded. You may need to reload modules for some changes to take effect.");
		return 0;
	end

	show_message(error_messages[ret]);
	return 1;
end
-- ejabberdctl compatibility

function commands.register(arg)
	local user, host, password = unpack(arg);
	if (not (user and host)) or arg[1] == "--help" then
		if user ~= "--help" then
			if not user then
				show_message [[No username specified]]
			elseif not host then
				show_message [[Please specify which host you want to register the user on]];
			end
		end
		show_usage("register USER HOST [PASSWORD]", "Register a user on the server, with the given password");
		return 1;
	end
	if not password then
		password = read_password();
		if not password then
			show_message [[Unable to register user with no password]];
			return 1;
		end
	end
	
	local ok, msg = prosodyctl.adduser { user = user, host = host, password = password };
	
	if ok then return 0; end
	
	show_message(error_messages[msg])
	return 1;
end

function commands.unregister(arg)
	local user, host = unpack(arg);
	if (not (user and host)) or arg[1] == "--help" then
		if user ~= "--help" then
			if not user then
				show_message [[No username specified]]
			elseif not host then
				show_message [[Please specify which host you want to unregister the user from]];
			end
		end
		show_usage("unregister USER HOST [PASSWORD]", "Permanently remove a user account from the server");
		return 1;
	end

	local ok, msg = prosodyctl.deluser { user = user, host = host };
	
	if ok then return 0; end
	
	show_message(error_messages[msg])
	return 1;
end

local openssl = require "util.openssl";
local lfs = require "lfs";

local cert_commands = {};

local function ask_overwrite(filename)
	return lfs.attributes(filename) and not show_yesno("Overwrite "..filename .. "?");
end

function cert_commands.config(arg)
	if #arg >= 1 and arg[1] ~= "--help" then
		local conf_filename = (CFG_DATADIR or ".") .. "/" .. arg[1] .. ".cnf";
		if ask_overwrite(conf_filename) then
			return nil, conf_filename;
		end
		local conf = openssl.config.new();
		conf:from_prosody(hosts, config, arg);
		for k, v in pairs(conf.distinguished_name) do
			local nv;
			if k == "commonName" then 
				v = arg[1]
			elseif k == "emailAddress" then
				v = "xmpp@" .. arg[1];
			end
			nv = show_prompt(("%s (%s):"):format(k, nv or v));
			nv = (not nv or nv == "") and v or nv;
			if nv:find"[\192-\252][\128-\191]+" then
				conf.req.string_mask = "utf8only"
			end
			conf.distinguished_name[k] = nv ~= "." and nv or nil;
		end
		local conf_file = io.open(conf_filename, "w");
		conf_file:write(conf:serialize());
		conf_file:close();
		print("");
		show_message("Config written to " .. conf_filename);
		return nil, conf_filename;
	else
		show_usage("cert config HOSTNAME [HOSTNAME+]", "Builds a certificate config file covering the supplied hostname(s)")
	end
end

function cert_commands.key(arg)
	if #arg >= 1 and arg[1] ~= "--help" then
		local key_filename = (CFG_DATADIR or ".") .. "/" .. arg[1] .. ".key";
		if ask_overwrite(key_filename) then
			return nil, key_filename;
		end
		os.remove(key_filename); -- We chmod this file to not have write permissions
		local key_size = tonumber(arg[2] or show_prompt("Choose key size (2048):") or 2048);
		if openssl.genrsa{out=key_filename, key_size} then
			os.execute(("chmod 400 '%s'"):format(key_filename));
			show_message("Key written to ".. key_filename);
			return nil, key_filename;
		end
		show_message("There was a problem, see OpenSSL output");
	else
		show_usage("cert key HOSTNAME <bits>", "Generates a RSA key named HOSTNAME.key\n "
		.."Prompts for a key size if none given")
	end
end

function cert_commands.request(arg)
	if #arg >= 1 and arg[1] ~= "--help" then
		local req_filename = (CFG_DATADIR or ".") .. "/" .. arg[1] .. ".req";
		if ask_overwrite(req_filename) then
			return nil, req_filename;
		end
		local _, key_filename = cert_commands.key({arg[1]});
		local _, conf_filename = cert_commands.config(arg);
		if openssl.req{new=true, key=key_filename, utf8=true, config=conf_filename, out=req_filename} then
			show_message("Certificate request written to ".. req_filename);
		else
			show_message("There was a problem, see OpenSSL output");
		end
	else
		show_usage("cert request HOSTNAME [HOSTNAME+]", "Generates a certificate request for the supplied hostname(s)")
	end
end

function cert_commands.generate(arg)
	if #arg >= 1 and arg[1] ~= "--help" then
		local cert_filename = (CFG_DATADIR or ".") .. "/" .. arg[1] .. ".cert";
		if ask_overwrite(cert_filename) then
			return nil, conf_filename;
		end
		local _, key_filename = cert_commands.key({arg[1]});
		local _, conf_filename = cert_commands.config(arg);
		local ret;
		if key_filename and conf_filename and cert_filename
			and openssl.req{new=true, x509=true, nodes=true, key=key_filename,
				days=365, sha1=true, utf8=true, config=conf_filename, out=cert_filename} then
			show_message("Certificate written to ".. cert_filename);
		else
			show_message("There was a problem, see OpenSSL output");
		end
	else
		show_usage("cert generate HOSTNAME [HOSTNAME+]", "Generates a self-signed certificate for the current hostname(s)")
	end
end

function commands.cert(arg)
	if #arg >= 1 and arg[1] ~= "--help" then
		local subcmd = table.remove(arg, 1);
		if type(cert_commands[subcmd]) == "function" then
			if not arg[1] then
				show_message"You need to supply at least one hostname"
				arg = { "--help" };
			end
			if arg[1] ~= "--help" and not hosts[arg[1]] then
				show_message(error_messages["no-such-host"]);
				return
			end
			return cert_commands[subcmd](arg);
		end
	end
	show_usage("cert config|request|generate|key", "Helpers for generating X.509 certificates and keys.")
end

---------------------

if command and command:match("^mod_") then -- Is a command in a module
	local module_name = command:match("^mod_(.+)");
	local ret, err = modulemanager.load("*", module_name);
	if not ret then
		show_message("Failed to load module '"..module_name.."': "..err);
		os.exit(1);
	end
	
	table.remove(arg, 1);
	
	local module = modulemanager.get_module("*", module_name);
	if not module then
		show_message("Failed to load module '"..module_name.."': Unknown error");
		os.exit(1);
	end
	
	if not modulemanager.module_has_method(module, "command") then
		show_message("Fail: mod_"..module_name.." does not support any commands");
		os.exit(1);
	end
	
	local ok, ret = modulemanager.call_module_method(module, "command", arg);
	if ok then
		if type(ret) == "number" then
			os.exit(ret);
		elseif type(ret) == "string" then
			show_message(ret);
		end
		os.exit(0); -- :)
	else
		show_message("Failed to execute command: "..error_messages[ret]);
		os.exit(1); -- :(
	end
end

if not commands[command] then -- Show help for all commands
	function show_usage(usage, desc)
		print(" "..usage);
		print("    "..desc);
	end

	print("prosodyctl - Manage a Prosody server");
	print("");
	print("Usage: "..arg[0].." COMMAND [OPTIONS]");
	print("");
	print("Where COMMAND may be one of:\n");

	local hidden_commands = require "util.set".new{ "register", "unregister", "addplugin" };
	local commands_order = { "adduser", "passwd", "deluser", "start", "stop", "restart", "reload", "about" };

	local done = {};

	for _, command_name in ipairs(commands_order) do
		local command = commands[command_name];
		if command then
			command{ "--help" };
			print""
			done[command_name] = true;
		end
	end

	for command_name, command in pairs(commands) do
		if not done[command_name] and not hidden_commands:contains(command_name) then
			command{ "--help" };
			print""
			done[command_name] = true;
		end
	end
	
	
	os.exit(0);
end

os.exit(commands[command]({ select(2, unpack(arg)) }));