util.cache: Add support for creating a proxy table to a cache, that looks and acts...
[prosody.git] / prosodyctl
index 6a6414f6885c9aa42b45aba4d04729537abcfb87..c8366faf9ae68193ccc98767f8ea68fd62a4f047 100755 (executable)
 
 -- 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");
+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");
 
 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
 
@@ -220,6 +220,7 @@ local error_messages = setmetatable({
                ["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";
@@ -232,6 +233,7 @@ local function make_host(hostname)
                type = "local",
                events = prosody.events,
                modules = {},
+               sessions = {},
                users = require "core.usermanager".new_null_provider(hostname)
        };
 end
@@ -243,13 +245,14 @@ end
 local modulemanager = require "core.modulemanager"
 
 local prosodyctl = require "util.prosodyctl"
-require "socket"
+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();
@@ -257,7 +260,9 @@ function read_version()
                        prosody.version = "hg:"..prosody.version;
                end
        else
-               prosody.version = "unknown";
+               local hg = require"util.mercurial";
+               local hgid = hg.check_id(CFG_SOURCEDIR or ".");
+               if hgid then prosody.version = "hg:" .. hgid; end
        end
 end
 
@@ -319,7 +324,7 @@ function commands.passwd(arg)
                show_usage([[passwd JID]], [[Set the password for the specified user account in Prosody]]);
                return 1;
        end
-       local user, host = jid_split(arg[1])
+       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]]
@@ -372,7 +377,6 @@ function commands.deluser(arg)
        
        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
 
@@ -413,7 +417,11 @@ function commands.start(arg)
        
        local ok, ret = prosodyctl.start();
        if ok then
-               if config.get("*", "daemonize") ~= false 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();
@@ -524,16 +532,32 @@ function commands.about(arg)
                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:  ", CFG_DATADIR or "./");
-       print("Plugin directory:", CFG_PLUGINDIR or "./");
-       print("Config directory:", CFG_CONFIGDIR or "./");
-       print("Source directory:", CFG_SOURCEDIR or "./");
+       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)
+                       local opath = 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);
@@ -548,13 +572,15 @@ function commands.about(arg)
                print("  "..path);
        end
        print("");
-       local luarocks_status = (pcall(require, "luarocks.loader") and "Installed ("..(luarocks.cfg.program_version or "2.x+")..")")
+       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
@@ -564,8 +590,11 @@ function commands.about(arg)
                        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(array.collect(keys(module_versions)):sort()) do
+       for _, name in ipairs(sorted_keys) do
                print(name..":"..string.rep(" ", longest_name-#name), module_versions[name]);
        end
        print("");
@@ -650,40 +679,65 @@ local lfs;
 
 local cert_commands = {};
 
-local function ask_overwrite(filename)
-       return lfs.attributes(filename) and not show_yesno("Overwrite "..filename .. "?");
+-- 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 ask_overwrite(conf_filename) then
+               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);
-               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 i, 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]+)$";
-                                       if tld and #tld == 2 and tld ~= "uk" then
-                                               v = tld:upper();
+               if distinguished_name then
+                       local dn = {};
+                       for k, v in distinguished_name:gmatch("/([^=/]+)=([^/]+)") do
+                               table.insert(dn, k);
+                               dn[k] = v;
+                       end
+                       conf.distinguished_name = dn;
+               else
+                       show_message("Please provide details to include in the certificate config file.");
+                       show_message("Leave the field empty to use the default value or '.' to exclude the field.")
+                       for i, k in ipairs(openssl._DN_order) do
+                               local v = conf.distinguished_name[k];
+                               if v then
+                                       local nv;
+                                       if k == "commonName" then
+                                               v = arg[1]
+                                       elseif k == "emailAddress" then
+                                               v = "xmpp@" .. arg[1];
+                                       elseif k == "countryName" then
+                                               local tld = arg[1]:match"%.([a-z]+)$";
+                                               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
-                               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
                local conf_file, err = io.open(conf_filename, "w");
@@ -705,7 +759,7 @@ 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 ask_overwrite(key_filename) then
+               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
@@ -727,12 +781,12 @@ 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 ask_overwrite(req_filename) then
+               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, config=conf_filename, out=req_filename} then
+               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");
@@ -745,7 +799,7 @@ 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 ask_overwrite(cert_filename) then
+               if use_existing(cert_filename) then
                        return nil, cert_filename;
                end
                local _, key_filename = cert_commands.key({arg[1]});
@@ -753,8 +807,10 @@ function cert_commands.generate(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
+                               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
@@ -783,6 +839,456 @@ function commands.cert(arg)
        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 ssl = dependencies.softreq"ssl";
+               if not ssl then
+                       if not set.intersection(all_options, set.new({"require_encryption", "c2s_require_encryption", "s2s_require_encryption"})):empty() 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
+               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 vaild 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 vaild 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