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=CFG_SOURCEDIR or os.getenv("PROSODY_SRCDIR");
CFG_CONFIGDIR=CFG_CONFIGDIR or os.getenv("PROSODY_CFGDIR");
CFG_PLUGINDIR=CFG_PLUGINDIR or os.getenv("PROSODY_PLUGINDIR");
CFG_DATADIR=CFG_DATADIR or 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;
	core_post_stanza = function () end; -- TODO: mod_router!
};
_G.prosody = prosody;

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

config = require "core.configmanager"

local ENV_CONFIG;
do
	local filenames = {};

	local filename;
	if arg[1] == "--config" and arg[2] then
		table.insert(filenames, arg[2]);
		if CFG_CONFIGDIR then
			table.insert(filenames, CFG_CONFIGDIR.."/"..arg[2]);
		end
		table.remove(arg, 1); table.remove(arg, 1);
	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();
			ENV_CONFIG = filename;
			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("*", "log");
config.set("*", "log", { { levels = { min="info" }, to = "console" } });

local data_path = config.get("*", "data_path") or CFG_DATADIR or "data";
local custom_plugin_paths = config.get("*", "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 = "0.3.6";
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("*", "prosody_user") or "prosody";
		local desired_group = config.get("*", "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("*", "umask") or "027");
	pposix.setenv("HOME", data_path);
	pposix.setenv("PROSODY_CONFIG", ENV_CONFIG);
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))
	os.exit(1);
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";
		["invalid-pidfile"] = "The 'pidfile' option in the configuration file is not a string, 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,
		modules = {},
		sessions = {},
		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"
local socket = 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");
	prosody.version = "unknown";
	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
		local hg = require"util.mercurial";
		local hgid = hg.check_id(CFG_SOURCEDIR or ".");
		if hgid then prosody.version = "hg:" .. hgid; end
	end
end

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

local jid_split = require "util.jid".prepped_split;

local prosodyctl_timeout = (config.get("*", "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 = jid_split(arg[1]);
	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 = jid_split(arg[1]);
	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 = jid_split(arg[1]);
	if not user and host then
		show_message [[Failed to understand JID, please supply the JID to the user account you want to delete]]
		show_usage [[deluser 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)
		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
		local daemonize = config.get("*", "daemonize");
		if daemonize == nil then
			daemonize = prosody.installed;
		end
		if daemonize 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 pwd = ".";
	local lfs = require "lfs";
	local array = require "util.array";
	local keys = require "util.iterators".keys;
	local hg = require"util.mercurial";
	local relpath = config.resolve_relative_path;

	print("Prosody "..(prosody.version or "(unknown version)"));
	print("");
	print("# Prosody directories");
	print("Data directory:     "..relpath(pwd, data_path));
	print("Config directory:   "..relpath(pwd, CFG_CONFIGDIR or "."));
	print("Source directory:   "..relpath(pwd, CFG_SOURCEDIR or "."));
	print("Plugin directories:")
	print("  "..(prosody.paths.plugins:gsub("([^;]+);?", function(path)
			path = config.resolve_relative_path(pwd, path);
			local hgid, hgrepo = hg.check_id(path);
			if not hgid and hgrepo then
				return path.." - "..hgrepo .."!\n  ";
			end
			-- 010452cfaf53 is the first commit in the prosody-modules repository
			hgrepo = hgrepo == "010452cfaf53" and "prosody-modules";
			return path..(hgid and " - "..(hgrepo or "HG").." rev: "..hgid or "")
				.."\n  ";
		end)));
	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 ("..(package.loaded["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;
	local luaevent =dependencies.softreq"luaevent";
	local ssl = dependencies.softreq"ssl";
	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
	if luaevent then
		module_versions["libevent"] = luaevent.core.libevent_version();
	end
	local sorted_keys = array.collect(keys(module_versions)):sort();
	for _, name in ipairs(sorted_keys) 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

local unpack = table.unpack or unpack; -- luacheck: ignore 113

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;
local lfs;

local cert_commands = {};

-- If a file already exists, ask if the user wants to use it or replace it
-- Backups the old file if replaced
local function use_existing(filename)
	local attrs = lfs.attributes(filename);
	if attrs then
		if show_yesno(filename .. " exists, do you want to replace it? [y/n]") then
			local backup = filename..".bkp~"..os.date("%FT%T", attrs.change);
			os.rename(filename, backup);
			show_message(filename.." backed up to "..backup);
		else
			-- Use the existing file
			return true;
		end
	end
end

function cert_commands.config(arg)
	if #arg >= 1 and arg[1] ~= "--help" then
		local conf_filename = (CFG_DATADIR or "./certs") .. "/" .. arg[1] .. ".cnf";
		if use_existing(conf_filename) then
			return nil, conf_filename;
		end
		local distinguished_name;
		if arg[#arg]:find("^/") then
			distinguished_name = table.remove(arg);
		end
		local conf = openssl.config.new();
		conf:from_prosody(hosts, config, arg);
		if distinguished_name then
			local dn = {};
			for k, v in distinguished_name:gmatch("/([^=/]+)=([^/]+)") do
				table.insert(dn, k);
				dn[k] = v;
			end
			conf.distinguished_name = dn;
		else
			show_message("Please provide details to include in the certificate config file.");
			show_message("Leave the field empty to use the default value or '.' to exclude the field.")
			for _, k in ipairs(openssl._DN_order) do
				local v = conf.distinguished_name[k];
				if v then
					local nv;
					if k == "commonName" then
						v = arg[1]
					elseif k == "emailAddress" then
						v = "xmpp@" .. arg[1];
					elseif k == "countryName" then
						local tld = arg[1]:match"%.([a-z]+)$";
						if tld and #tld == 2 and tld ~= "uk" then
							v = tld:upper();
						end
					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
			end
		end
		local conf_file, err = io.open(conf_filename, "w");
		if not conf_file then
			show_warning("Could not open OpenSSL config file for writing");
			show_warning(err);
			os.exit(1);
		end
		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 "./certs") .. "/" .. arg[1] .. ".key";
		if use_existing(key_filename) then
			return nil, key_filename;
		end
		os.remove(key_filename); -- This file, if it exists is unlikely to have write permissions
		local key_size = tonumber(arg[2] or show_prompt("Choose key size (2048):") or 2048);
		local old_umask = pposix.umask("0377");
		if openssl.genrsa{out=key_filename, key_size} then
			os.execute(("chmod 400 '%s'"):format(key_filename));
			show_message("Key written to ".. key_filename);
			pposix.umask(old_umask);
			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 "./certs") .. "/" .. arg[1] .. ".req";
		if use_existing(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, sha256=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 "./certs") .. "/" .. arg[1] .. ".crt";
		if use_existing(cert_filename) then
			return nil, cert_filename;
		end
		local _, key_filename = cert_commands.key({arg[1]});
		local _, conf_filename = cert_commands.config(arg);
		if key_filename and conf_filename and cert_filename
			and openssl.req{new=true, x509=true, nodes=true, key=key_filename,
				days=365, sha256=true, utf8=true, config=conf_filename, out=cert_filename} then
			show_message("Certificate written to ".. cert_filename);
			print();
			show_message(("Example config:\n\nssl = {\n\tcertificate = %q;\n\tkey = %q;\n}"):format(cert_filename, key_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
		openssl = require "util.openssl";
		lfs = require "lfs";
		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

function commands.check(arg)
	if arg[1] == "--help" then
		show_usage([[check]], [[Perform basic checks on your Prosody installation]]);
		return 1;
	end
	local what = table.remove(arg, 1);
	local array, set = require "util.array", require "util.set";
	local it = require "util.iterators";
	local ok = true;
	local function disabled_hosts(host, conf) return host ~= "*" and conf.enabled ~= false; end
	local function enabled_hosts() return it.filter(disabled_hosts, pairs(config.getconfig())); end
	if not what or what == "disabled" then
		local disabled_hosts = set.new();
		for host, host_options in it.filter("*", pairs(config.getconfig())) do
			if host_options.enabled == false then
				disabled_hosts:add(host);
			end
		end
		if not disabled_hosts:empty() then
			local msg = "Checks will be skipped for these disabled hosts: %s";
			if what then msg = "These hosts are disabled: %s"; end
			show_warning(msg, tostring(disabled_hosts));
			if what then return 0; end
			print""
		end
	end
	if not what or what == "config" then
		print("Checking config...");
		local deprecated = set.new({
			"bosh_ports", "disallow_s2s", "no_daemonize", "anonymous_login", "require_encryption",
			"vcard_compatibility",
		});
		local known_global_options = set.new({
			"pidfile", "log", "plugin_paths", "prosody_user", "prosody_group", "daemonize",
			"umask", "prosodyctl_timeout", "use_ipv6", "use_libevent", "network_settings",
			"network_backend", "http_default_host",
		});
		local config = config.getconfig();
		-- Check that we have any global options (caused by putting a host at the top)
		if it.count(it.filter("log", pairs(config["*"]))) == 0 then
			ok = false;
			print("");
			print("    No global options defined. Perhaps you have put a host definition at the top")
			print("    of the config file? They should be at the bottom, see http://prosody.im/doc/configure#overview");
		end
		if it.count(enabled_hosts()) == 0 then
			ok = false;
			print("");
			if it.count(it.filter("*", pairs(config))) == 0 then
				print("    No hosts are defined, please add at least one VirtualHost section")
			elseif config["*"]["enabled"] == false then
				print("    No hosts are enabled. Remove enabled = false from the global section or put enabled = true under at least one VirtualHost section")
			else
				print("    All hosts are disabled. Remove enabled = false from at least one VirtualHost section")
			end
		end
		if not config["*"].modules_enabled then
			print("    No global modules_enabled is set?");
			local suggested_global_modules;
			for host, options in enabled_hosts() do
				if not options.component_module and options.modules_enabled then
					suggested_global_modules = set.intersection(suggested_global_modules or set.new(options.modules_enabled), set.new(options.modules_enabled));
				end
			end
			if not suggested_global_modules:empty() then
				print("    Consider moving these modules into modules_enabled in the global section:")
				print("    "..tostring(suggested_global_modules / function (x) return ("%q"):format(x) end));
			end
			print();
		end
		-- Check for global options under hosts
		local global_options = set.new(it.to_array(it.keys(config["*"])));
		local deprecated_global_options = set.intersection(global_options, deprecated);
		if not deprecated_global_options:empty() then
			print("");
			print("    You have some deprecated options in the global section:");
			print("    "..tostring(deprecated_global_options))
			ok = false;
		end
		for host, options in enabled_hosts() do
			local host_options = set.new(it.to_array(it.keys(options)));
			local misplaced_options = set.intersection(host_options, known_global_options);
			for name in pairs(options) do
				if name:match("^interfaces?")
				or name:match("_ports?$") or name:match("_interfaces?$")
				or (name:match("_ssl$") and not name:match("^[cs]2s_ssl$")) then
					misplaced_options:add(name);
				end
			end
			if not misplaced_options:empty() then
				ok = false;
				print("");
				local n = it.count(misplaced_options);
				print("    You have "..n.." option"..(n>1 and "s " or " ").."set under "..host.." that should be");
				print("    in the global section of the config file, above any VirtualHost or Component definitions,")
				print("    see http://prosody.im/doc/configure#overview for more information.")
				print("");
				print("    You need to move the following option"..(n>1 and "s" or "")..": "..table.concat(it.to_array(misplaced_options), ", "));
			end
			local subdomain = host:match("^[^.]+");
			if not(host_options:contains("component_module")) and (subdomain == "jabber" or subdomain == "xmpp"
			   or subdomain == "chat" or subdomain == "im") then
			   	print("");
			   	print("    Suggestion: If "..host.. " is a new host with no real users yet, consider renaming it now to");
			   	print("     "..host:gsub("^[^.]+%.", "")..". You can use SRV records to redirect XMPP clients and servers to "..host..".");
			   	print("     For more information see: http://prosody.im/doc/dns");
			end
		end
		local all_modules = set.new(config["*"].modules_enabled);
		local all_options = set.new(it.to_array(it.keys(config["*"])));
		for host in enabled_hosts() do
			all_options:include(set.new(it.to_array(it.keys(config[host]))));
			all_modules:include(set.new(config[host].modules_enabled));
		end
		for mod in all_modules do
			if mod:match("^mod_") then
				print("");
				print("    Modules in modules_enabled should not have the 'mod_' prefix included.");
				print("    Change '"..mod.."' to '"..mod:match("^mod_(.*)").."'.");
			elseif mod:match("^auth_") then
				print("");
				print("    Authentication modules should not be added to modules_enabled,");
				print("    but be specified in the 'authentication' option.");
				print("    Remove '"..mod.."' from modules_enabled and instead add");
				print("        authentication = '"..mod:match("^auth_(.*)").."'");
				print("    For more information see https://prosody.im/doc/authentication");
			elseif mod:match("^storage_") then
				print("");
				print("    storage modules should not be added to modules_enabled,");
				print("    but be specified in the 'storage' option.");
				print("    Remove '"..mod.."' from modules_enabled and instead add");
				print("        storage = '"..mod:match("^storage_(.*)").."'");
				print("    For more information see https://prosody.im/doc/storage");
			end
		end
		local require_encryption = set.intersection(all_options, set.new({"require_encryption", "c2s_require_encryption", "s2s_require_encryption"})):empty();
		local ssl = dependencies.softreq"ssl";
		if not ssl then
			if not require_encryption then
				print("");
				print("    You require encryption but LuaSec is not available.");
				print("    Connections will fail.");
				ok = false;
			end
		elseif not ssl.loadcertificate then
			if all_options:contains("s2s_secure_auth") then
				print("");
				print("    You have set s2s_secure_auth but your version of LuaSec does ");
				print("    not support certificate validation, so all s2s connections will");
				print("    fail.");
				ok = false;
			elseif all_options:contains("s2s_secure_domains") then
				local secure_domains = set.new();
				for host in enabled_hosts() do
					if config[host].s2s_secure_auth == true then
						secure_domains:add("*");
					else
						secure_domains:include(set.new(config[host].s2s_secure_domains));
					end
				end
				if not secure_domains:empty() then
					print("");
					print("    You have set s2s_secure_domains but your version of LuaSec does ");
					print("    not support certificate validation, so s2s connections to/from ");
					print("    these domains will fail.");
					ok = false;
				end
			end
		elseif require_encryption and not all_modules:contains("tls") then
			print("");
			print("    You require encryption but mod_tls is not enabled.");
			print("    Connections will fail.");
			ok = false;
		end

		print("Done.\n");
	end
	if not what or what == "dns" then
		local dns = require "net.dns";
		local idna = require "util.encodings".idna;
		local ip = require "util.ip";
		local c2s_ports = set.new(config.get("*", "c2s_ports") or {5222});
		local s2s_ports = set.new(config.get("*", "s2s_ports") or {5269});

		local c2s_srv_required, s2s_srv_required;
		if not c2s_ports:contains(5222) then
			c2s_srv_required = true;
		end
		if not s2s_ports:contains(5269) then
			s2s_srv_required = true;
		end

		local problem_hosts = set.new();

		local external_addresses, internal_addresses = set.new(), set.new();

		local fqdn = socket.dns.tohostname(socket.dns.gethostname());
		if fqdn then
			local res = dns.lookup(idna.to_ascii(fqdn), "A");
			if res then
				for _, record in ipairs(res) do
					external_addresses:add(record.a);
				end
			end
			local res = dns.lookup(idna.to_ascii(fqdn), "AAAA");
			if res then
				for _, record in ipairs(res) do
					external_addresses:add(record.aaaa);
				end
			end
		end

		local local_addresses = require"util.net".local_addresses() or {};

		for addr in it.values(local_addresses) do
			if not ip.new_ip(addr).private then
				external_addresses:add(addr);
			else
				internal_addresses:add(addr);
			end
		end

		if external_addresses:empty() then
			print("");
			print("   Failed to determine the external addresses of this server. Checks may be inaccurate.");
			c2s_srv_required, s2s_srv_required = true, true;
		end

		local v6_supported = not not socket.tcp6;

		for jid, host_options in enabled_hosts() do
			local all_targets_ok, some_targets_ok = true, false;
			local node, host = jid_split(jid);

			local is_component = not not host_options.component_module;
			print("Checking DNS for "..(is_component and "component" or "host").." "..jid.."...");
			if node then
				print("Only the domain part ("..host..") is used in DNS.")
			end
			local target_hosts = set.new();
			if not is_component then
				local res = dns.lookup("_xmpp-client._tcp."..idna.to_ascii(host)..".", "SRV");
				if res then
					for _, record in ipairs(res) do
						target_hosts:add(record.srv.target);
						if not c2s_ports:contains(record.srv.port) then
							print("    SRV target "..record.srv.target.." contains unknown client port: "..record.srv.port);
						end
					end
				else
					if c2s_srv_required then
						print("    No _xmpp-client SRV record found for "..host..", but it looks like you need one.");
						all_targets_ok = false;
					else
						target_hosts:add(host);
					end
				end
			end
			local res = dns.lookup("_xmpp-server._tcp."..idna.to_ascii(host)..".", "SRV");
			if res then
				for _, record in ipairs(res) do
					target_hosts:add(record.srv.target);
					if not s2s_ports:contains(record.srv.port) then
						print("    SRV target "..record.srv.target.." contains unknown server port: "..record.srv.port);
					end
				end
			else
				if s2s_srv_required then
					print("    No _xmpp-server SRV record found for "..host..", but it looks like you need one.");
					all_targets_ok = false;
				else
					target_hosts:add(host);
				end
			end
			if target_hosts:empty() then
				target_hosts:add(host);
			end

			if target_hosts:contains("localhost") then
				print("    Target 'localhost' cannot be accessed from other servers");
				target_hosts:remove("localhost");
			end

			local modules = set.new(it.to_array(it.values(host_options.modules_enabled or {})))
			                + set.new(it.to_array(it.values(config.get("*", "modules_enabled") or {})))
			                + set.new({ config.get(host, "component_module") });

			if modules:contains("proxy65") then
				local proxy65_target = config.get(host, "proxy65_address") or host;
				local A, AAAA = dns.lookup(idna.to_ascii(proxy65_target), "A"), dns.lookup(idna.to_ascii(proxy65_target), "AAAA");
				local prob = {};
				if not A then
					table.insert(prob, "A");
				end
				if v6_supported and not AAAA then
					table.insert(prob, "AAAA");
				end
				if #prob > 0 then
					print("    File transfer proxy "..proxy65_target.." has no "..table.concat(prob, "/").." record. Create one or set 'proxy65_address' to the correct host/IP.");
				end
			end

			for host in target_hosts do
				local host_ok_v4, host_ok_v6;
				local res = dns.lookup(idna.to_ascii(host), "A");
				if res then
					for _, record in ipairs(res) do
						if external_addresses:contains(record.a) then
							some_targets_ok = true;
							host_ok_v4 = true;
						elseif internal_addresses:contains(record.a) then
							host_ok_v4 = true;
							some_targets_ok = true;
							print("    "..host.." A record points to internal address, external connections might fail");
						else
							print("    "..host.." A record points to unknown address "..record.a);
							all_targets_ok = false;
						end
					end
				end
				local res = dns.lookup(idna.to_ascii(host), "AAAA");
				if res then
					for _, record in ipairs(res) do
						if external_addresses:contains(record.aaaa) then
							some_targets_ok = true;
							host_ok_v6 = true;
						elseif internal_addresses:contains(record.aaaa) then
							host_ok_v6 = true;
							some_targets_ok = true;
							print("    "..host.." AAAA record points to internal address, external connections might fail");
						else
							print("    "..host.." AAAA record points to unknown address "..record.aaaa);
							all_targets_ok = false;
						end
					end
				end

				local bad_protos = {}
				if not host_ok_v4 then
					table.insert(bad_protos, "IPv4");
				end
				if not host_ok_v6 then
					table.insert(bad_protos, "IPv6");
				end
				if #bad_protos > 0 then
					print("    Host "..host.." does not seem to resolve to this server ("..table.concat(bad_protos, "/")..")");
				end
				if host_ok_v6 and not v6_supported then
					print("    Host "..host.." has AAAA records, but your version of LuaSocket does not support IPv6.");
					print("      Please see http://prosody.im/doc/ipv6 for more information.");
				end
			end
			if not all_targets_ok then
				print("    "..(some_targets_ok and "Only some" or "No").." targets for "..host.." appear to resolve to this server.");
				if is_component then
					print("    DNS records are necessary if you want users on other servers to access this component.");
				end
				problem_hosts:add(host);
			end
			print("");
		end
		if not problem_hosts:empty() then
			print("");
			print("For more information about DNS configuration please see http://prosody.im/doc/dns");
			print("");
			ok = false;
		end
	end
	if not what or what == "certs" then
		local cert_ok;
		print"Checking certificates..."
		local x509_verify_identity = require"util.x509".verify_identity;
		local create_context = require "core.certmanager".create_context;
		local ssl = dependencies.softreq"ssl";
		-- local datetime_parse = require"util.datetime".parse_x509;
		local load_cert = ssl and ssl.loadcertificate;
		-- or ssl.cert_from_pem
		if not ssl then
			print("LuaSec not available, can't perform certificate checks")
			if what == "certs" then cert_ok = false end
		elseif not load_cert then
			print("This version of LuaSec (" .. ssl._VERSION .. ") does not support certificate checking");
			cert_ok = false
		else
			for host in enabled_hosts() do
				print("Checking certificate for "..host);
				-- First, let's find out what certificate this host uses.
				local host_ssl_config = config.rawget(host, "ssl")
					or config.rawget(host:match("%.(.*)"), "ssl");
				local global_ssl_config = config.rawget("*", "ssl");
				local ok, err, ssl_config = create_context(host, "server", host_ssl_config, global_ssl_config);
				if not ok then
					print("  Error: "..err);
					cert_ok = false
				elseif not ssl_config.certificate then
					print("  No 'certificate' found for "..host)
					cert_ok = false
				elseif not ssl_config.key then
					print("  No 'key' found for "..host)
					cert_ok = false
				else
					local key, err = io.open(ssl_config.key); -- Permissions check only
					if not key then
						print("    Could not open "..ssl_config.key..": "..err);
						cert_ok = false
					else
						key:close();
					end
					local cert_fh, err = io.open(ssl_config.certificate); -- Load the file.
					if not cert_fh then
						print("    Could not open "..ssl_config.certificate..": "..err);
						cert_ok = false
					else
						print("  Certificate: "..ssl_config.certificate)
						local cert = load_cert(cert_fh:read"*a"); cert_fh = cert_fh:close();
						if not cert:validat(os.time()) then
							print("    Certificate has expired.")
							cert_ok = false
						elseif not cert:validat(os.time() + 86400) then
							print("    Certificate expires within one day.")
							cert_ok = false
						elseif not cert:validat(os.time() + 86400*7) then
							print("    Certificate expires within one week.")
						elseif not cert:validat(os.time() + 86400*31) then
							print("    Certificate expires within one month.")
						end
						if config.get(host, "component_module") == nil
							and not x509_verify_identity(host, "_xmpp-client", cert) then
							print("    Not valid for client connections to "..host..".")
							cert_ok = false
						end
						if (not (config.get(host, "anonymous_login")
							or config.get(host, "authentication") == "anonymous"))
							and not x509_verify_identity(host, "_xmpp-server", cert) then
							print("    Not valid for server-to-server connections to "..host..".")
							cert_ok = false
						end
					end
				end
			end
			if cert_ok == false then
				print("")
				print("For more information about certificates please see http://prosody.im/doc/certificates");
				ok = false
			end
		end
		print("")
	end
	if not ok then
		print("Problems found, see above.");
	else
		print("All checks passed, congratulations!");
	end
	return ok and 0 or 2;
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)) }));