File

-- 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.
--
-- luacheck: ignore 212/self

module:set_global();

local hostmanager = require "core.hostmanager";
local modulemanager = require "core.modulemanager";
local s2smanager = require "core.s2smanager";
local portmanager = require "core.portmanager";
local helpers = require "util.helpers";
local server = require "net.server";

local _G = _G;

local prosody = _G.prosody;

local console_listener = { default_port = 5582; default_mode = "*a"; interface = "127.0.0.1" };

local unpack = table.unpack or unpack; -- luacheck: ignore 113
local iterators = require "util.iterators";
local keys, values = iterators.keys, iterators.values;
local jid_bare, jid_split, jid_join = import("util.jid", "bare", "prepped_split", "join");
local set, array = require "util.set", require "util.array";
local cert_verify_identity = require "util.x509".verify_identity;
local envload = require "util.envload".envload;
local envloadfile = require "util.envload".envloadfile;
local has_pposix, pposix = pcall(require, "util.pposix");
local async = require "util.async";
local serialize = require "util.serialization".new({ fatal = false, unquoted = true});

local commands = module:shared("commands")
local def_env = module:shared("env");
local default_env_mt = { __index = def_env };

local function redirect_output(target, session)
	local env = setmetatable({ print = session.print }, { __index = function (_, k) return rawget(target, k); end });
	env.dofile = function(name)
		local f, err = envloadfile(name, env);
		if not f then return f, err; end
		return f();
	end;
	return env;
end

console = {};

local runner_callbacks = {};

function runner_callbacks:ready()
	self.data.conn:resume();
end

function runner_callbacks:waiting()
	self.data.conn:pause();
end

function runner_callbacks:error(err)
	module:log("error", "Traceback[telnet]: %s", err);

	self.data.print("Fatal error while running command, it did not complete");
	self.data.print("Error: "..tostring(err));
end


function console:new_session(conn)
	local w = function(s) conn:write(s:gsub("\n", "\r\n")); end;
	local session = { conn = conn;
			send = function (t) w(tostring(t)); end;
			print = function (...)
				local t = {};
				for i=1,select("#", ...) do
					t[i] = tostring(select(i, ...));
				end
				w("| "..table.concat(t, "\t").."\n");
			end;
			disconnect = function () conn:close(); end;
			};
	session.env = setmetatable({}, default_env_mt);

	session.thread = async.runner(function (line)
		console:process_line(session, line);
		session.send(string.char(0));
	end, runner_callbacks, session);

	-- Load up environment with helper objects
	for name, t in pairs(def_env) do
		if type(t) == "table" then
			session.env[name] = setmetatable({ session = session }, { __index = t });
		end
	end

	return session;
end

function console:process_line(session, line)
	local useglobalenv;

	if line:match("^>") then
		line = line:gsub("^>", "");
		useglobalenv = true;
	elseif line == "\004" then
		commands["bye"](session, line);
		return;
	else
		local command = line:match("^%w+") or line:match("%p");
		if commands[command] then
			commands[command](session, line);
			return;
		end
	end

	session.env._ = line;

	if not useglobalenv and commands[line:lower()] then
		commands[line:lower()](session, line);
		return;
	end

	local chunkname = "=console";
	local env = (useglobalenv and redirect_output(_G, session)) or session.env or nil
	local chunk, err = envload("return "..line, chunkname, env);
	if not chunk then
		chunk, err = envload(line, chunkname, env);
		if not chunk then
			err = err:gsub("^%[string .-%]:%d+: ", "");
			err = err:gsub("^:%d+: ", "");
			err = err:gsub("'<eof>'", "the end of the line");
			session.print("Sorry, I couldn't understand that... "..err);
			return;
		end
	end

	local taskok, message = chunk();

	if not message then
		session.print("Result: "..tostring(taskok));
		return;
	elseif (not taskok) and message then
		session.print("Command completed with a problem");
		session.print("Message: "..tostring(message));
		return;
	end

	session.print("OK: "..tostring(message));
end

local sessions = {};

function console_listener.onconnect(conn)
	-- Handle new connection
	local session = console:new_session(conn);
	sessions[conn] = session;
	printbanner(session);
	session.send(string.char(0));
end

function console_listener.onincoming(conn, data)
	local session = sessions[conn];

	local partial = session.partial_data;
	if partial then
		data = partial..data;
	end

	for line in data:gmatch("[^\n]*[\n\004]") do
		if session.closed then return end
		session.thread:run(line);
	end
	session.partial_data = data:match("[^\n]+$");
end

function console_listener.onreadtimeout(conn)
	local session = sessions[conn];
	if session then
		session.send("\0");
		return true;
	end
end

function console_listener.ondisconnect(conn, err) -- luacheck: ignore 212/err
	local session = sessions[conn];
	if session then
		session.disconnect();
		sessions[conn] = nil;
	end
end

function console_listener.ondetach(conn)
	sessions[conn] = nil;
end

-- Console commands --
-- These are simple commands, not valid standalone in Lua

function commands.bye(session)
	session.print("See you! :)");
	session.closed = true;
	session.disconnect();
end
commands.quit, commands.exit = commands.bye, commands.bye;

commands["!"] = function (session, data)
	if data:match("^!!") and session.env._ then
		session.print("!> "..session.env._);
		return console_listener.onincoming(session.conn, session.env._);
	end
	local old, new = data:match("^!(.-[^\\])!(.-)!$");
	if old and new then
		local ok, res = pcall(string.gsub, session.env._, old, new);
		if not ok then
			session.print(res)
			return;
		end
		session.print("!> "..res);
		return console_listener.onincoming(session.conn, res);
	end
	session.print("Sorry, not sure what you want");
end


function commands.help(session, data)
	local print = session.print;
	local section = data:match("^help (%w+)");
	if not section then
		print [[Commands are divided into multiple sections. For help on a particular section, ]]
		print [[type: help SECTION (for example, 'help c2s'). Sections are: ]]
		print [[]]
		print [[c2s - Commands to manage local client-to-server sessions]]
		print [[s2s - Commands to manage sessions between this server and others]]
		print [[module - Commands to load/reload/unload modules/plugins]]
		print [[host - Commands to activate, deactivate and list virtual hosts]]
		print [[user - Commands to create and delete users, and change their passwords]]
		print [[server - Uptime, version, shutting down, etc.]]
		print [[port - Commands to manage ports the server is listening on]]
		print [[dns - Commands to manage and inspect the internal DNS resolver]]
		print [[xmpp - Commands for sending XMPP stanzas]]
		print [[config - Reloading the configuration, etc.]]
		print [[console - Help regarding the console itself]]
	elseif section == "c2s" then
		print [[c2s:show(jid) - Show all client sessions with the specified JID (or all if no JID given)]]
		print [[c2s:show_insecure() - Show all unencrypted client connections]]
		print [[c2s:show_secure() - Show all encrypted client connections]]
		print [[c2s:show_tls() - Show TLS cipher info for encrypted sessions]]
		print [[c2s:count() - Count sessions without listing them]]
		print [[c2s:close(jid) - Close all sessions for the specified JID]]
		print [[c2s:closeall() - Close all active c2s connections ]]
	elseif section == "s2s" then
		print [[s2s:show(domain) - Show all s2s connections for the given domain (or all if no domain given)]]
		print [[s2s:show_tls(domain) - Show TLS cipher info for encrypted sessions]]
		print [[s2s:close(from, to) - Close a connection from one domain to another]]
		print [[s2s:closeall(host) - Close all the incoming/outgoing s2s sessions to specified host]]
	elseif section == "module" then
		print [[module:load(module, host) - Load the specified module on the specified host (or all hosts if none given)]]
		print [[module:reload(module, host) - The same, but unloads and loads the module (saving state if the module supports it)]]
		print [[module:unload(module, host) - The same, but just unloads the module from memory]]
		print [[module:list(host) - List the modules loaded on the specified host]]
	elseif section == "host" then
		print [[host:activate(hostname) - Activates the specified host]]
		print [[host:deactivate(hostname) - Disconnects all clients on this host and deactivates]]
		print [[host:list() - List the currently-activated hosts]]
	elseif section == "user" then
		print [[user:create(jid, password) - Create the specified user account]]
		print [[user:password(jid, password) - Set the password for the specified user account]]
		print [[user:delete(jid) - Permanently remove the specified user account]]
		print [[user:list(hostname, pattern) - List users on the specified host, optionally filtering with a pattern]]
	elseif section == "server" then
		print [[server:version() - Show the server's version number]]
		print [[server:uptime() - Show how long the server has been running]]
		print [[server:memory() - Show details about the server's memory usage]]
		print [[server:shutdown(reason) - Shut down the server, with an optional reason to be broadcast to all connections]]
	elseif section == "port" then
		print [[port:list() - Lists all network ports prosody currently listens on]]
		print [[port:close(port, interface) - Close a port]]
	elseif section == "dns" then
		print [[dns:lookup(name, type, class) - Do a DNS lookup]]
		print [[dns:addnameserver(nameserver) - Add a nameserver to the list]]
		print [[dns:setnameserver(nameserver) - Replace the list of name servers with the supplied one]]
		print [[dns:purge() - Clear the DNS cache]]
		print [[dns:cache() - Show cached records]]
	elseif section == "xmpp" then
		print [[xmpp:ping(localhost, remotehost) -- Sends a ping to a remote XMPP server and reports the response]]
	elseif section == "config" then
		print [[config:reload() - Reload the server configuration. Modules may need to be reloaded for changes to take effect.]]
	elseif section == "console" then
		print [[Hey! Welcome to Prosody's admin console.]]
		print [[First thing, if you're ever wondering how to get out, simply type 'quit'.]]
		print [[Secondly, note that we don't support the full telnet protocol yet (it's coming)]]
		print [[so you may have trouble using the arrow keys, etc. depending on your system.]]
		print [[]]
		print [[For now we offer a couple of handy shortcuts:]]
		print [[!! - Repeat the last command]]
		print [[!old!new! - repeat the last command, but with 'old' replaced by 'new']]
		print [[]]
		print [[For those well-versed in Prosody's internals, or taking instruction from those who are,]]
		print [[you can prefix a command with > to escape the console sandbox, and access everything in]]
		print [[the running server. Great fun, but be careful not to break anything :)]]
	end
	print [[]]
end

-- Session environment --
-- Anything in def_env will be accessible within the session as a global variable

--luacheck: ignore 212/self

def_env.server = {};

function def_env.server:insane_reload()
	prosody.unlock_globals();
	dofile "prosody"
	prosody = _G.prosody;
	return true, "Server reloaded";
end

function def_env.server:version()
	return true, tostring(prosody.version or "unknown");
end

function def_env.server:uptime()
	local t = os.time()-prosody.start_time;
	local seconds = t%60;
	t = (t - seconds)/60;
	local minutes = t%60;
	t = (t - minutes)/60;
	local hours = t%24;
	t = (t - hours)/24;
	local days = t;
	return true, string.format("This server has been running for %d day%s, %d hour%s and %d minute%s (since %s)",
		days, (days ~= 1 and "s") or "", hours, (hours ~= 1 and "s") or "",
		minutes, (minutes ~= 1 and "s") or "", os.date("%c", prosody.start_time));
end

function def_env.server:shutdown(reason)
	prosody.shutdown(reason);
	return true, "Shutdown initiated";
end

local function human(kb)
	local unit = "K";
	if kb > 1024 then
		kb, unit = kb/1024, "M";
	end
	return ("%0.2f%sB"):format(kb, unit);
end

function def_env.server:memory()
	if not has_pposix or not pposix.meminfo then
		return true, "Lua is using "..human(collectgarbage("count"));
	end
	local mem, lua_mem = pposix.meminfo(), collectgarbage("count");
	local print = self.session.print;
	print("Process: "..human((mem.allocated+mem.allocated_mmap)/1024));
	print("   Used: "..human(mem.used/1024).." ("..human(lua_mem).." by Lua)");
	print("   Free: "..human(mem.unused/1024).." ("..human(mem.returnable/1024).." returnable)");
	return true, "OK";
end

def_env.module = {};

local function get_hosts_set(hosts, module)
	if type(hosts) == "table" then
		if hosts[1] then
			return set.new(hosts);
		elseif hosts._items then
			return hosts;
		end
	elseif type(hosts) == "string" then
		return set.new { hosts };
	elseif hosts == nil then
		local hosts_set = set.new(array.collect(keys(prosody.hosts)))
			/ function (host) return (prosody.hosts[host].type == "local" or module and modulemanager.is_loaded(host, module)) and host or nil; end;
		if module and modulemanager.get_module("*", module) then
			hosts_set:add("*");
		end
		return hosts_set;
	end
end

function def_env.module:load(name, hosts, config)
	hosts = get_hosts_set(hosts);

	-- Load the module for each host
	local ok, err, count, mod = true, nil, 0;
	for host in hosts do
		if (not modulemanager.is_loaded(host, name)) then
			mod, err = modulemanager.load(host, name, config);
			if not mod then
				ok = false;
				if err == "global-module-already-loaded" then
					if count > 0 then
						ok, err, count = true, nil, 1;
					end
					break;
				end
				self.session.print(err or "Unknown error loading module");
			else
				count = count + 1;
				self.session.print("Loaded for "..mod.module.host);
			end
		end
	end

	return ok, (ok and "Module loaded onto "..count.." host"..(count ~= 1 and "s" or "")) or ("Last error: "..tostring(err));
end

function def_env.module:unload(name, hosts)
	hosts = get_hosts_set(hosts, name);

	-- Unload the module for each host
	local ok, err, count = true, nil, 0;
	for host in hosts do
		if modulemanager.is_loaded(host, name) then
			ok, err = modulemanager.unload(host, name);
			if not ok then
				ok = false;
				self.session.print(err or "Unknown error unloading module");
			else
				count = count + 1;
				self.session.print("Unloaded from "..host);
			end
		end
	end
	return ok, (ok and "Module unloaded from "..count.." host"..(count ~= 1 and "s" or "")) or ("Last error: "..tostring(err));
end

local function _sort_hosts(a, b)
	if a == "*" then return true
	elseif b == "*" then return false
	else return a < b; end
end

function def_env.module:reload(name, hosts)
	hosts = array.collect(get_hosts_set(hosts, name)):sort(_sort_hosts)

	-- Reload the module for each host
	local ok, err, count = true, nil, 0;
	for _, host in ipairs(hosts) do
		if modulemanager.is_loaded(host, name) then
			ok, err = modulemanager.reload(host, name);
			if not ok then
				ok = false;
				self.session.print(err or "Unknown error reloading module");
			else
				count = count + 1;
				if ok == nil then
					ok = true;
				end
				self.session.print("Reloaded on "..host);
			end
		end
	end
	return ok, (ok and "Module reloaded on "..count.." host"..(count ~= 1 and "s" or "")) or ("Last error: "..tostring(err));
end

function def_env.module:list(hosts)
	if hosts == nil then
		hosts = array.collect(keys(prosody.hosts));
		table.insert(hosts, 1, "*");
	end
	if type(hosts) == "string" then
		hosts = { hosts };
	end
	if type(hosts) ~= "table" then
		return false, "Please supply a host or a list of hosts you would like to see";
	end

	local print = self.session.print;
	for _, host in ipairs(hosts) do
		print((host == "*" and "Global" or host)..":");
		local modules = array.collect(keys(modulemanager.get_modules(host) or {})):sort();
		if #modules == 0 then
			if prosody.hosts[host] then
				print("    No modules loaded");
			else
				print("    Host not found");
			end
		else
			for _, name in ipairs(modules) do
				local status, status_text = modulemanager.get_module(host, name).module:get_status();
				local status_summary = "";
				if status == "warn" or status == "error" then
					status_summary = (" (%s: %s)"):format(status, status_text);
				end
				print(("    %s%s"):format(name, status_summary));
			end
		end
	end
end

def_env.config = {};
function def_env.config:load(filename, format)
	local config_load = require "core.configmanager".load;
	local ok, err = config_load(filename, format);
	if not ok then
		return false, err or "Unknown error loading config";
	end
	return true, "Config loaded";
end

function def_env.config:get(host, key)
	if key == nil then
		host, key = "*", host;
	end
	local config_get = require "core.configmanager".get
	return true, serialize(config_get(host, key));
end

function def_env.config:reload()
	local ok, err = prosody.reload_config();
	return ok, (ok and "Config reloaded (you may need to reload modules to take effect)") or tostring(err);
end

local function common_info(session, line)
	if session.id then
		line[#line+1] = "["..session.id.."]"
	else
		line[#line+1] = "["..session.type..(tostring(session):match("%x*$")).."]"
	end
end

local function session_flags(session, line)
	line = line or {};
	common_info(session, line);
	if session.type == "c2s" then
		local status, priority = "unavailable", tostring(session.priority or "-");
		if session.presence then
			status = session.presence:get_child_text("show") or "available";
		end
		line[#line+1] = status.."("..priority..")";
	end
	if session.cert_identity_status == "valid" then
		line[#line+1] = "(authenticated)";
	end
	if session.secure then
		line[#line+1] = "(encrypted)";
	end
	if session.compressed then
		line[#line+1] = "(compressed)";
	end
	if session.smacks then
		line[#line+1] = "(sm)";
	end
	if session.ip and session.ip:match(":") then
		line[#line+1] = "(IPv6)";
	end
	if session.remote then
		line[#line+1] = "(remote)";
	end
	if session.is_bidi then
		line[#line+1] = "(bidi)";
	end
	if session.bosh_version then
		line[#line+1] = "(bosh)";
	end
	if session.websocket_request then
		line[#line+1] = "(websocket)";
	end
	return table.concat(line, " ");
end

local function tls_info(session, line)
	line = line or {};
	common_info(session, line);
	if session.secure then
		local sock = session.conn and session.conn.socket and session.conn:socket();
		if sock and sock.info then
			local info = sock:info();
			line[#line+1] = ("(%s with %s)"):format(info.protocol, info.cipher);
		else
			line[#line+1] = "(cipher info unavailable)";
		end
	else
		line[#line+1] = "(insecure)";
	end
	return table.concat(line, " ");
end

def_env.c2s = {};

local function get_jid(session)
	if session.username then
		return session.full_jid or jid_join(session.username, session.host, session.resource);
	end

	local conn = session.conn;
	local ip = session.ip or "?";
	local clientport = conn and conn:clientport() or "?";
	local serverip = conn and conn.server and conn:server():ip() or "?";
	local serverport = conn and conn:serverport() or "?"
	return jid_join("["..ip.."]:"..clientport, session.host or "["..serverip.."]:"..serverport);
end

local function get_c2s()
	local c2s = array.collect(values(prosody.full_sessions));
	c2s:append(array.collect(values(module:shared"/*/c2s/sessions")));
	c2s:append(array.collect(values(module:shared"/*/bosh/sessions")));
	c2s:unique();
	return c2s;
end

local function show_c2s(callback)
	get_c2s():sort(function(a, b)
		if a.host == b.host then
			if a.username == b.username then
				return (a.resource or "") > (b.resource or "");
			end
			return (a.username or "") > (b.username or "");
		end
		return (a.host or "") > (b.host or "");
	end):map(function (session)
		callback(get_jid(session), session)
	end);
end

function def_env.c2s:count()
	local c2s = get_c2s();
	return true, "Total: "..  #c2s .." clients";
end

function def_env.c2s:show(match_jid, annotate)
	local print, count = self.session.print, 0;
	annotate = annotate or session_flags;
	local curr_host = false;
	show_c2s(function (jid, session)
		if curr_host ~= session.host then
			curr_host = session.host;
			print(curr_host or "(not connected to any host yet)");
		end
		if (not match_jid) or jid:match(match_jid) then
			count = count + 1;
			print(annotate(session, { "  ", jid }));
		end
	end);
	return true, "Total: "..count.." clients";
end

function def_env.c2s:show_insecure(match_jid)
	local print, count = self.session.print, 0;
	show_c2s(function (jid, session)
		if ((not match_jid) or jid:match(match_jid)) and not session.secure then
			count = count + 1;
			print(jid);
		end
	end);
	return true, "Total: "..count.." insecure client connections";
end

function def_env.c2s:show_secure(match_jid)
	local print, count = self.session.print, 0;
	show_c2s(function (jid, session)
		if ((not match_jid) or jid:match(match_jid)) and session.secure then
			count = count + 1;
			print(jid);
		end
	end);
	return true, "Total: "..count.." secure client connections";
end

function def_env.c2s:show_tls(match_jid)
	return self:show(match_jid, tls_info);
end

local function build_reason(text, condition)
	if text or condition then
		return {
			text = text,
			condition = condition or "undefined-condition",
		};
	end
end

function def_env.c2s:close(match_jid, text, condition)
	local count = 0;
	show_c2s(function (jid, session)
		if jid == match_jid or jid_bare(jid) == match_jid then
			count = count + 1;
			session:close(build_reason(text, condition));
		end
	end);
	return true, "Total: "..count.." sessions closed";
end

function def_env.c2s:closeall(text, condition)
	local count = 0;
	--luacheck: ignore 212/jid
	show_c2s(function (jid, session)
		count = count + 1;
		session:close(build_reason(text, condition));
	end);
	return true, "Total: "..count.." sessions closed";
end


def_env.s2s = {};
function def_env.s2s:show(match_jid, annotate)
	local print = self.session.print;
	annotate = annotate or session_flags;

	local count_in, count_out = 0,0;
	local s2s_list = { };

	local s2s_sessions = module:shared"/*/s2s/sessions";
	for _, session in pairs(s2s_sessions) do
		local remotehost, localhost, direction;
		if session.direction == "outgoing" then
			direction = "->";
			count_out = count_out + 1;
			remotehost, localhost = session.to_host or "?", session.from_host or "?";
		else
			direction = "<-";
			count_in = count_in + 1;
			remotehost, localhost = session.from_host or "?", session.to_host or "?";
		end
		local sess_lines = { l = localhost, r = remotehost,
			annotate(session, { "", direction, remotehost or "?" })};

		if (not match_jid) or remotehost:match(match_jid) or localhost:match(match_jid) then
			table.insert(s2s_list, sess_lines);
			-- luacheck: ignore 421/print
			local print = function (s) table.insert(sess_lines, "        "..s); end
			if session.sendq then
				print("There are "..#session.sendq.." queued outgoing stanzas for this connection");
			end
			if session.type == "s2sout_unauthed" then
				if session.connecting then
					print("Connection not yet established");
					if not session.srv_hosts then
						if not session.conn then
							print("We do not yet have a DNS answer for this host's SRV records");
						else
							print("This host has no SRV records, using A record instead");
						end
					elseif session.srv_choice then
						print("We are on SRV record "..session.srv_choice.." of "..#session.srv_hosts);
						local srv_choice = session.srv_hosts[session.srv_choice];
						print("Using "..(srv_choice.target or ".")..":"..(srv_choice.port or 5269));
					end
				elseif session.notopen then
					print("The <stream> has not yet been opened");
				elseif not session.dialback_key then
					print("Dialback has not been initiated yet");
				elseif session.dialback_key then
					print("Dialback has been requested, but no result received");
				end
			end
			if session.type == "s2sin_unauthed" then
				print("Connection not yet authenticated");
			elseif session.type == "s2sin" then
				for name in pairs(session.hosts) do
					if name ~= session.from_host then
						print("also hosts "..tostring(name));
					end
				end
			end
		end
	end

	-- Sort by local host, then remote host
	table.sort(s2s_list, function(a,b)
		if a.l == b.l then return a.r < b.r; end
		return a.l < b.l;
	end);
	local lasthost;
	for _, sess_lines in ipairs(s2s_list) do
		if sess_lines.l ~= lasthost then print(sess_lines.l); lasthost=sess_lines.l end
		for _, line in ipairs(sess_lines) do print(line); end
	end
	return true, "Total: "..count_out.." outgoing, "..count_in.." incoming connections";
end

function def_env.s2s:show_tls(match_jid)
	return self:show(match_jid, tls_info);
end

local function print_subject(print, subject)
	for _, entry in ipairs(subject) do
		print(
			("    %s: %q"):format(
				entry.name or entry.oid,
				entry.value:gsub("[\r\n%z%c]", " ")
			)
		);
	end
end

-- As much as it pains me to use the 0-based depths that OpenSSL does,
-- I think there's going to be more confusion among operators if we
-- break from that.
local function print_errors(print, errors)
	for depth, t in pairs(errors) do
		print(
			("    %d: %s"):format(
				depth-1,
				table.concat(t, "\n|        ")
			)
		);
	end
end

function def_env.s2s:showcert(domain)
	local print = self.session.print;
	local s2s_sessions = module:shared"/*/s2s/sessions";
	local domain_sessions = set.new(array.collect(values(s2s_sessions)))
		/function(session) return (session.to_host == domain or session.from_host == domain) and session or nil; end;
	local cert_set = {};
	for session in domain_sessions do
		local conn = session.conn;
		conn = conn and conn:socket();
		if not conn.getpeerchain then
			if conn.dohandshake then
				error("This version of LuaSec does not support certificate viewing");
			end
		else
			local cert = conn:getpeercertificate();
			if cert then
				local certs = conn:getpeerchain();
				local digest = cert:digest("sha1");
				if not cert_set[digest] then
					local chain_valid, chain_errors = conn:getpeerverification();
					cert_set[digest] = {
						{
						  from = session.from_host,
						  to = session.to_host,
						  direction = session.direction
						};
						chain_valid = chain_valid;
						chain_errors = chain_errors;
						certs = certs;
					};
				else
					table.insert(cert_set[digest], {
						from = session.from_host,
						to = session.to_host,
						direction = session.direction
					});
				end
			end
		end
	end
	local domain_certs = array.collect(values(cert_set));
	-- Phew. We now have a array of unique certificates presented by domain.
	local n_certs = #domain_certs;

	if n_certs == 0 then
		return "No certificates found for "..domain;
	end

	local function _capitalize_and_colon(byte)
		return string.upper(byte)..":";
	end
	local function pretty_fingerprint(hash)
		return hash:gsub("..", _capitalize_and_colon):sub(1, -2);
	end

	for cert_info in values(domain_certs) do
		local certs = cert_info.certs;
		local cert = certs[1];
		print("---")
		print("Fingerprint (SHA1): "..pretty_fingerprint(cert:digest("sha1")));
		print("");
		local n_streams = #cert_info;
		print("Currently used on "..n_streams.." stream"..(n_streams==1 and "" or "s")..":");
		for _, stream in ipairs(cert_info) do
			if stream.direction == "incoming" then
				print("    "..stream.to.." <- "..stream.from);
			else
				print("    "..stream.from.." -> "..stream.to);
			end
		end
		print("");
		local chain_valid, errors = cert_info.chain_valid, cert_info.chain_errors;
		local valid_identity = cert_verify_identity(domain, "xmpp-server", cert);
		if chain_valid then
			print("Trusted certificate: Yes");
		else
			print("Trusted certificate: No");
			print_errors(print, errors);
		end
		print("");
		print("Issuer: ");
		print_subject(print, cert:issuer());
		print("");
		print("Valid for "..domain..": "..(valid_identity and "Yes" or "No"));
		print("Subject:");
		print_subject(print, cert:subject());
	end
	print("---");
	return ("Showing "..n_certs.." certificate"
		..(n_certs==1 and "" or "s")
		.." presented by "..domain..".");
end

function def_env.s2s:close(from, to, text, condition)
	local print, count = self.session.print, 0;
	local s2s_sessions = module:shared"/*/s2s/sessions";

	local match_id;
	if from and not to then
		match_id, from = from, nil;
	elseif not to then
		return false, "Syntax: s2s:close('from', 'to') - Closes all s2s sessions from 'from' to 'to'";
	elseif from == to then
		return false, "Both from and to are the same... you can't do that :)";
	end

	for _, session in pairs(s2s_sessions) do
		local id = session.id or (session.type..tostring(session):match("[a-f0-9]+$"));
		if (match_id and match_id == id)
		or (session.from_host == from and session.to_host == to) then
			print(("Closing connection from %s to %s [%s]"):format(session.from_host, session.to_host, id));
			(session.close or s2smanager.destroy_session)(session, build_reason(text, condition));
			count = count + 1 ;
		end
	end
	return true, "Closed "..count.." s2s session"..((count == 1 and "") or "s");
end

function def_env.s2s:closeall(host, text, condition)
	local count = 0;
	local s2s_sessions = module:shared"/*/s2s/sessions";
	for _,session in pairs(s2s_sessions) do
		if not host or session.from_host == host or session.to_host == host then
			session:close(build_reason(text, condition));
			count = count + 1;
		end
	end
	if count == 0 then return false, "No sessions to close.";
	else return true, "Closed "..count.." s2s session"..((count == 1 and "") or "s"); end
end

def_env.host = {}; def_env.hosts = def_env.host;

function def_env.host:activate(hostname, config)
	return hostmanager.activate(hostname, config);
end
function def_env.host:deactivate(hostname, reason)
	return hostmanager.deactivate(hostname, reason);
end

function def_env.host:list()
	local print = self.session.print;
	local i = 0;
	local type;
	for host, host_session in iterators.sorted_pairs(prosody.hosts) do
		i = i + 1;
		type = host_session.type;
		if type == "local" then
			print(host);
		else
			type = module:context(host):get_option_string("component_module", type);
			if type ~= "component" then
				type = type .. " component";
			end
			print(("%s (%s)"):format(host, type));
		end
	end
	return true, i.." hosts";
end

def_env.port = {};

function def_env.port:list()
	local print = self.session.print;
	local services = portmanager.get_active_services().data;
	local n_services, n_ports = 0, 0;
	for service, interfaces in iterators.sorted_pairs(services) do
		n_services = n_services + 1;
		local ports_list = {};
		for interface, ports in pairs(interfaces) do
			for port in pairs(ports) do
				table.insert(ports_list, "["..interface.."]:"..port);
			end
		end
		n_ports = n_ports + #ports_list;
		print(service..": "..table.concat(ports_list, ", "));
	end
	return true, n_services.." services listening on "..n_ports.." ports";
end

function def_env.port:close(close_port, close_interface)
	close_port = assert(tonumber(close_port), "Invalid port number");
	local n_closed = 0;
	local services = portmanager.get_active_services().data;
	for service, interfaces in pairs(services) do -- luacheck: ignore 213
		for interface, ports in pairs(interfaces) do
			if not close_interface or close_interface == interface then
				if ports[close_port] then
					self.session.print("Closing ["..interface.."]:"..close_port.."...");
					local ok, err = portmanager.close(interface, close_port)
					if not ok then
						self.session.print("Failed to close "..interface.." "..close_port..": "..err);
					else
						n_closed = n_closed + 1;
					end
				end
			end
		end
	end
	return true, "Closed "..n_closed.." ports";
end

def_env.muc = {};

local console_room_mt = {
	__index = function (self, k) return self.room[k]; end;
	__tostring = function (self)
		return "MUC room <"..self.room.jid..">";
	end;
};

local function check_muc(jid)
	local room_name, host = jid_split(jid);
	if not prosody.hosts[host] then
		return nil, "No such host: "..host;
	elseif not prosody.hosts[host].modules.muc then
		return nil, "Host '"..host.."' is not a MUC service";
	end
	return room_name, host;
end

function def_env.muc:create(room_jid, config)
	local room_name, host = check_muc(room_jid);
	if not room_name then
		return room_name, host;
	end
	if not room_name then return nil, host end
	if config ~= nil and type(config) ~= "table" then return nil, "Config must be a table"; end
	if prosody.hosts[host].modules.muc.get_room_from_jid(room_jid) then return nil, "Room exists already" end
	return prosody.hosts[host].modules.muc.create_room(room_jid, config);
end

function def_env.muc:room(room_jid)
	local room_name, host = check_muc(room_jid);
	if not room_name then
		return room_name, host;
	end
	local room_obj = prosody.hosts[host].modules.muc.get_room_from_jid(room_jid);
	if not room_obj then
		return nil, "No such room: "..room_jid;
	end
	return setmetatable({ room = room_obj }, console_room_mt);
end

function def_env.muc:list(host)
	local host_session = prosody.hosts[host];
	if not host_session or not host_session.modules.muc then
		return nil, "Please supply the address of a local MUC component";
	end
	local print = self.session.print;
	local c = 0;
	for room in host_session.modules.muc.each_room() do
		print(room.jid);
		c = c + 1;
	end
	return true, c.." rooms";
end

local um = require"core.usermanager";

def_env.user = {};
function def_env.user:create(jid, password)
	local username, host = jid_split(jid);
	if not prosody.hosts[host] then
		return nil, "No such host: "..host;
	elseif um.user_exists(username, host) then
		return nil, "User exists";
	end
	local ok, err = um.create_user(username, password, host);
	if ok then
		return true, "User created";
	else
		return nil, "Could not create user: "..err;
	end
end

function def_env.user:delete(jid)
	local username, host = jid_split(jid);
	if not prosody.hosts[host] then
		return nil, "No such host: "..host;
	elseif not um.user_exists(username, host) then
		return nil, "No such user";
	end
	local ok, err = um.delete_user(username, host);
	if ok then
		return true, "User deleted";
	else
		return nil, "Could not delete user: "..err;
	end
end

function def_env.user:password(jid, password)
	local username, host = jid_split(jid);
	if not prosody.hosts[host] then
		return nil, "No such host: "..host;
	elseif not um.user_exists(username, host) then
		return nil, "No such user";
	end
	local ok, err = um.set_password(username, password, host, nil);
	if ok then
		return true, "User password changed";
	else
		return nil, "Could not change password for user: "..err;
	end
end

function def_env.user:list(host, pat)
	if not host then
		return nil, "No host given";
	elseif not prosody.hosts[host] then
		return nil, "No such host";
	end
	local print = self.session.print;
	local total, matches = 0, 0;
	for user in um.users(host) do
		if not pat or user:match(pat) then
			print(user.."@"..host);
			matches = matches + 1;
		end
		total = total + 1;
	end
	return true, "Showing "..(pat and (matches.." of ") or "all " )..total.." users";
end

def_env.xmpp = {};

local st = require "util.stanza";
local new_id = require "util.id".medium;
function def_env.xmpp:ping(localhost, remotehost, timeout)
	localhost = select(2, jid_split(localhost));
	remotehost = select(2, jid_split(remotehost));
	if not localhost then
		return nil, "Invalid sender hostname";
	elseif not prosody.hosts[localhost] then
		return nil, "No such local host";
	end
	if not remotehost then
		return nil, "Invalid destination hostname";
	elseif prosody.hosts[remotehost] then
		return nil, "Both hosts are local";
	end
	local iq = st.iq{ from=localhost, to=remotehost, type="get", id=new_id()}
			:tag("ping", {xmlns="urn:xmpp:ping"});
	local ret, err;
	local wait, done = async.waiter();
	module:context(localhost):send_iq(iq, nil, timeout)
		:next(function (ret_) ret = ret_; end,
			function (err_) err = err_; end)
		:finally(done);
	wait();
	if ret then
		return true, "pong from " .. ret.stanza.attr.from;
	else
		return false, tostring(err);
	end
end

def_env.dns = {};
local adns = require"net.adns";
local dns = require"net.dns";

function def_env.dns:lookup(name, typ, class)
	local ret = "Query sent";
	local print = self.session.print;
	local function handler(...)
		ret = "Got response";
		print(...);
	end
	adns.lookup(handler, name, typ, class);
	return true, ret;
end

function def_env.dns:addnameserver(...)
	dns._resolver:addnameserver(...)
	return true
end

function def_env.dns:setnameserver(...)
	dns._resolver:setnameserver(...)
	return true
end

function def_env.dns:purge()
	dns.purge()
	return true
end

function def_env.dns:cache()
	return true, "Cache:\n"..tostring(dns.cache())
end

def_env.http = {};

function def_env.http:list()
	local print = self.session.print;

	for host in pairs(prosody.hosts) do
		local http_apps = modulemanager.get_items("http-provider", host);
		if #http_apps > 0 then
			local http_host = module:context(host):get_option_string("http_host");
			print("HTTP endpoints on "..host..(http_host and (" (using "..http_host.."):") or ":"));
			for _, provider in ipairs(http_apps) do
				local url = module:context(host):http_url(provider.name, provider.default_path);
				print("", url);
			end
			print("");
		end
	end

	local default_host = module:get_option_string("http_default_host");
	if not default_host then
		print("HTTP requests to unknown hosts will return 404 Not Found");
	else
		print("HTTP requests to unknown hosts will be handled by "..default_host);
	end
	return true;
end

def_env.debug = {};

function def_env.debug:logevents(host)
	helpers.log_host_events(host);
	return true;
end

function def_env.debug:events(host, event)
	local events_obj;
	if host and host ~= "*" then
		if host == "http" then
			events_obj = require "net.http.server"._events;
		elseif not prosody.hosts[host] then
			return false, "Unknown host: "..host;
		else
			events_obj = prosody.hosts[host].events;
		end
	else
		events_obj = prosody.events;
	end
	return true, helpers.show_events(events_obj, event);
end

function def_env.debug:timers()
	local socket = require "socket";
	local print = self.session.print;
	local add_task = require"util.timer".add_task;
	local h, params = add_task.h, add_task.params;
	if h then
		print("-- util.timer");
		for i, id in ipairs(h.ids) do
			if not params[id] then
				print(os.date("%F %T", h.priorities[i]), h.items[id]);
			elseif not params[id].callback then
				print(os.date("%F %T", h.priorities[i]), h.items[id], unpack(params[id]));
			else
				print(os.date("%F %T", h.priorities[i]), params[id].callback, unpack(params[id]));
			end
		end
	end
	if server.event_base then
		local count = 0;
		for _, v in pairs(debug.getregistry()) do
			if type(v) == "function" and v.callback and v.callback == add_task._on_timer then
				count = count + 1;
			end
		end
		print(count .. " libevent callbacks");
	end
	if h then
		local next_time = h:peek();
		if next_time then
			return true, os.date("Next event at %F %T (in %%.6fs)", next_time):format(next_time - socket.gettime());
		end
	end
	return true;
end

-- COMPAT: debug:timers() was timer:info() for some time in trunk
def_env.timer = { info = def_env.debug.timers };

module:hook("server-stopping", function(event)
	for _, session in pairs(sessions) do
		session.print("Shutting down: "..(event.reason or "unknown reason"));
	end
end);

def_env.stats = {};

local function format_stat(type, value, ref_value)
	ref_value = ref_value or value;
	--do return tostring(value) end
	if type == "duration" then
		if ref_value < 0.001 then
			return ("%g µs"):format(value*1000000);
		elseif ref_value < 0.9 then
			return ("%0.2f ms"):format(value*1000);
		end
		return ("%0.2f"):format(value);
	elseif type == "size" then
		if ref_value > 1048576 then
			return ("%d MB"):format(value/1048576);
		elseif ref_value > 1024 then
			return ("%d KB"):format(value/1024);
		end
		return ("%d bytes"):format(value);
	elseif type == "rate" then
		if ref_value < 0.9 then
			return ("%0.2f/min"):format(value*60);
		end
		return ("%0.2f/sec"):format(value);
	end
	return tostring(value);
end

local stats_methods = {};
function stats_methods:bounds(_lower, _upper)
	for _, stat_info in ipairs(self) do
		local data = stat_info[4];
		if data then
			local lower = _lower or data.min;
			local upper = _upper or data.max;
			local new_data = {
				min = lower;
				max = upper;
				samples = {};
				sample_count = 0;
				count = data.count;
				units = data.units;
			};
			local sum = 0;
			for _, v in ipairs(data.samples) do
				if v > upper then
					break;
				elseif v>=lower then
					table.insert(new_data.samples, v);
					sum = sum + v;
				end
			end
			new_data.sample_count = #new_data.samples;
			stat_info[4] = new_data;
			stat_info[3] = sum/new_data.sample_count;
		end
	end
	return self;
end

function stats_methods:trim(lower, upper)
	upper = upper or (100-lower);
	local statistics = require "util.statistics";
	for _, stat_info in ipairs(self) do
		-- Strip outliers
		local data = stat_info[4];
		if data then
			local new_data = {
				min = statistics.get_percentile(data, lower);
				max = statistics.get_percentile(data, upper);
				samples = {};
				sample_count = 0;
				count = data.count;
				units = data.units;
			};
			local sum = 0;
			for _, v in ipairs(data.samples) do
				if v > new_data.max then
					break;
				elseif v>=new_data.min then
					table.insert(new_data.samples, v);
					sum = sum + v;
				end
			end
			new_data.sample_count = #new_data.samples;
			stat_info[4] = new_data;
			stat_info[3] = sum/new_data.sample_count;
		end
	end
	return self;
end

function stats_methods:max(upper)
	return self:bounds(nil, upper);
end

function stats_methods:min(lower)
	return self:bounds(lower, nil);
end

function stats_methods:summary()
	local statistics = require "util.statistics";
	for _, stat_info in ipairs(self) do
		local type, value, data = stat_info[2], stat_info[3], stat_info[4];
		if data and data.samples then
			table.insert(stat_info.output, string.format("Count: %d (%d captured)",
				data.count,
				data.sample_count
			));
			table.insert(stat_info.output, string.format("Min: %s  Mean: %s  Max: %s",
				format_stat(type, data.min),
				format_stat(type, value),
				format_stat(type, data.max)
			));
			table.insert(stat_info.output, string.format("Q1: %s  Median: %s  Q3: %s",
				format_stat(type, statistics.get_percentile(data, 25)),
				format_stat(type, statistics.get_percentile(data, 50)),
				format_stat(type, statistics.get_percentile(data, 75))
			));
		end
	end
	return self;
end

function stats_methods:cfgraph()
	for _, stat_info in ipairs(self) do
		local name, type, value, data = unpack(stat_info, 1, 4);
		local function print(s)
			table.insert(stat_info.output, s);
		end

		if data and data.sample_count and data.sample_count > 0 then
			local raw_histogram = require "util.statistics".get_histogram(data);

			local graph_width, graph_height = 50, 10;
			local eighth_chars = "   ▁▂▃▄▅▆▇█";

			local range = data.max - data.min;

			if range > 0 then
				local x_scaling = #raw_histogram/graph_width;
				local histogram = {};
				for i = 1, graph_width do
					histogram[i] = math.max(raw_histogram[i*x_scaling-1] or 0, raw_histogram[i*x_scaling] or 0);
				end

				print("");
				print(("_"):rep(52)..format_stat(type, data.max));
				for row = graph_height, 1, -1 do
					local row_chars = {};
					local min_eighths, max_eighths = 8, 0;
					for i = 1, #histogram do
						local char_eighths = math.ceil(math.max(math.min((graph_height/(data.max/histogram[i]))-(row-1), 1), 0)*8);
						if char_eighths < min_eighths then
							min_eighths = char_eighths;
						end
						if char_eighths > max_eighths then
							max_eighths = char_eighths;
						end
						if char_eighths == 0 then
							row_chars[i] = "-";
						else
							local char = eighth_chars:sub(char_eighths*3+1, char_eighths*3+3);
							row_chars[i] = char;
						end
					end
					print(table.concat(row_chars).."|-"..format_stat(type, data.max/(graph_height/(row-0.5))));
				end
				print(("\\    "):rep(11));
				local x_labels = {};
				for i = 1, 11 do
					local s = ("%-4s"):format((i-1)*10);
					if #s > 4 then
						s = s:sub(1, 3).."…";
					end
					x_labels[i] = s;
				end
				print(" "..table.concat(x_labels, " "));
				local units = "%";
				local margin = math.floor((graph_width-#units)/2);
				print((" "):rep(margin)..units);
			else
				print("[range too small to graph]");
			end
			print("");
		end
	end
	return self;
end

function stats_methods:histogram()
	for _, stat_info in ipairs(self) do
		local name, type, value, data = unpack(stat_info, 1, 4);
		local function print(s)
			table.insert(stat_info.output, s);
		end

		if not data then
			print("[no data]");
			return self;
		elseif not data.sample_count then
			print("[not a sampled metric type]");
			return self;
		end

		local graph_width, graph_height = 50, 10;
		local eighth_chars = "   ▁▂▃▄▅▆▇█";

		local range = data.max - data.min;

		if range > 0 then
			local n_buckets = graph_width;

			local histogram = {};
			for i = 1, n_buckets do
				histogram[i] = 0;
			end
			local max_bin_samples = 0;
			for _, d in ipairs(data.samples) do
				local bucket = math.floor(1+(n_buckets-1)/(range/(d-data.min)));
				histogram[bucket] = histogram[bucket] + 1;
				if histogram[bucket] > max_bin_samples then
					max_bin_samples = histogram[bucket];
				end
			end

			print("");
			print(("_"):rep(52)..max_bin_samples);
			for row = graph_height, 1, -1 do
				local row_chars = {};
				local min_eighths, max_eighths = 8, 0;
				for i = 1, #histogram do
					local char_eighths = math.ceil(math.max(math.min((graph_height/(max_bin_samples/histogram[i]))-(row-1), 1), 0)*8);
					if char_eighths < min_eighths then
						min_eighths = char_eighths;
					end
					if char_eighths > max_eighths then
						max_eighths = char_eighths;
					end
					if char_eighths == 0 then
						row_chars[i] = "-";
					else
						local char = eighth_chars:sub(char_eighths*3+1, char_eighths*3+3);
						row_chars[i] = char;
					end
				end
				print(table.concat(row_chars).."|-"..math.ceil((max_bin_samples/graph_height)*(row-0.5)));
			end
			print(("\\    "):rep(11));
			local x_labels = {};
			for i = 1, 11 do
				local s = ("%-4s"):format(format_stat(type, data.min+range*i/11, data.min):match("^%S+"));
				if #s > 4 then
					s = s:sub(1, 3).."…";
				end
				x_labels[i] = s;
			end
			print(" "..table.concat(x_labels, " "));
			local units = format_stat(type, data.min):match("%s+(.+)$") or data.units or "";
			local margin = math.floor((graph_width-#units)/2);
			print((" "):rep(margin)..units);
		else
			print("[range too small to graph]");
		end
		print("");
	end
	return self;
end

local function stats_tostring(stats)
	local print = stats.session.print;
	for _, stat_info in ipairs(stats) do
		if #stat_info.output > 0 then
			print("\n#"..stat_info[1]);
			print("");
			for _, v in ipairs(stat_info.output) do
				print(v);
			end
			print("");
		else
			print(("%-50s %s"):format(stat_info[1], format_stat(stat_info[2], stat_info[3])));
		end
	end
	return #stats.." statistics displayed";
end

local stats_mt = {__index = stats_methods, __tostring = stats_tostring }
local function new_stats_context(self)
	return setmetatable({ session = self.session, stats = true }, stats_mt);
end

function def_env.stats:show(filter)
	local stats, changed, extra = require "core.statsmanager".get_stats();
	local available, displayed = 0, 0;
	local displayed_stats = new_stats_context(self);
	for name, value in iterators.sorted_pairs(stats) do
		available = available + 1;
		if not filter or name:match(filter) then
			displayed = displayed + 1;
			local type = name:match(":(%a+)$");
			table.insert(displayed_stats, {
				name, type, value, extra[name];
				output = {};
			});
		end
	end
	return displayed_stats;
end



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

function printbanner(session)
	local option = module:get_option_string("console_banner", "full");
	if option == "full" or option == "graphic" then
		session.print [[
                   ____                \   /     _
                    |  _ \ _ __ ___  ___  _-_   __| |_   _
                    | |_) | '__/ _ \/ __|/ _ \ / _` | | | |
                    |  __/| | | (_) \__ \ |_| | (_| | |_| |
                    |_|   |_|  \___/|___/\___/ \__,_|\__, |
                    A study in simplicity            |___/

]]
	end
	if option == "short" or option == "full" then
	session.print("Welcome to the Prosody administration console. For a list of commands, type: help");
	session.print("You may find more help on using this console in our online documentation at ");
	session.print("https://prosody.im/doc/console\n");
	end
	if option ~= "short" and option ~= "full" and option ~= "graphic" then
		session.print(option);
	end
end

module:provides("net", {
	name = "console";
	listener = console_listener;
	default_port = 5582;
	private = true;
});