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-- Prosody IM
-- Copyright (C) 2008-2009 Matthew Wild
-- Copyright (C) 2008-2009 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
local logger = require "logger";
local log = logger.init("xmppserver_listener");
local lxp = require "lxp"
local init_xmlhandlers = require "core.xmlhandlers"
local s2s_new_incoming = require "core.s2smanager".new_incoming;
local s2s_streamopened = require "core.s2smanager".streamopened;
local s2s_streamclosed = require "core.s2smanager".streamclosed;
local s2s_destroy_session = require "core.s2smanager".destroy_session;
local s2s_attempt_connect = require "core.s2smanager".attempt_connection;
local stream_callbacks = { stream_tag = "http://etherx.jabber.org/streams\1stream",
default_ns = "jabber:server",
streamopened = s2s_streamopened, streamclosed = s2s_streamclosed, handlestanza = core_process_stanza };
function stream_callbacks.error(session, error, data)
if error == "no-stream" then
session:close("invalid-namespace");
else
session.log("debug", "Server-to-server XML parse error: %s", tostring(error));
session:close("xml-not-well-formed");
end
end
local function handleerr(err) log("error", "Traceback[s2s]: %s: %s", tostring(err), debug.traceback()); end
function stream_callbacks.handlestanza(a, b)
xpcall(function () core_process_stanza(a, b) end, handleerr);
end
local connlisteners_register = require "net.connlisteners".register;
local t_insert = table.insert;
local t_concat = table.concat;
local t_concatall = function (t, sep) local tt = {}; for _, s in ipairs(t) do t_insert(tt, tostring(s)); end return t_concat(tt, sep); end
local m_random = math.random;
local format = string.format;
local sessionmanager = require "core.sessionmanager";
local sm_new_session, sm_destroy_session = sessionmanager.new_session, sessionmanager.destroy_session;
local st = require "util.stanza";
local sessions = {};
local xmppserver = { default_port = 5269, default_mode = "*a" };
-- These are session methods --
local function session_reset_stream(session)
-- Reset stream
local parser = lxp.new(init_xmlhandlers(session, stream_callbacks), "\1");
session.parser = parser;
session.notopen = true;
function session.data(conn, data)
local ok, err = parser:parse(data);
if ok then return; end
(session.log or log)("warn", "Received invalid XML: %s", data);
(session.log or log)("warn", "Problem was: %s", err);
session:close("xml-not-well-formed");
end
return true;
end
local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
local default_stream_attr = { ["xmlns:stream"] = stream_callbacks.stream_tag:match("[^\1]*"), xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
local function session_close(session, reason)
local log = session.log or log;
if session.conn then
if session.notopen then
session.sends2s("<?xml version='1.0'?>");
session.sends2s(st.stanza("stream:stream", default_stream_attr):top_tag());
end
if reason then
if type(reason) == "string" then -- assume stream error
log("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, reason);
session.sends2s(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
elseif type(reason) == "table" then
if reason.condition then
local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
if reason.text then
stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
end
if reason.extra then
stanza:add_child(reason.extra);
end
log("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, tostring(stanza));
session.sends2s(stanza);
elseif reason.name then -- a stanza
log("info", "Disconnecting %s->%s[%s], <stream:error> is: %s", session.from_host or "(unknown host)", session.to_host or "(unknown host)", session.type, tostring(reason));
session.sends2s(reason);
end
end
end
session.sends2s("</stream:stream>");
if session.notopen or not session.conn.close() then
session.conn.close(true); -- Force FIXME: timer?
end
session.conn.close();
xmppserver.disconnect(session.conn, "stream error");
end
end
-- End of session methods --
function xmppserver.listener(conn, data)
local session = sessions[conn];
if not session then
session = s2s_new_incoming(conn);
sessions[conn] = session;
-- Logging functions --
local conn_name = "s2sin"..tostring(conn):match("[a-f0-9]+$");
session.log = logger.init(conn_name);
session.log("info", "Incoming s2s connection");
session.reset_stream = session_reset_stream;
session.close = session_close;
session_reset_stream(session); -- Initialise, ready for use
session.dispatch_stanza = stream_callbacks.handlestanza;
end
if data then
session.data(conn, data);
end
end
function xmppserver.status(conn, status)
if status == "ssl-handshake-complete" then
local session = sessions[conn];
if session and session.direction == "outgoing" then
local format, to_host, from_host = string.format, session.to_host, session.from_host;
session.log("debug", "Sending stream header...");
session.sends2s(format([[<stream:stream xmlns='jabber:server' xmlns:db='jabber:server:dialback' xmlns:stream='http://etherx.jabber.org/streams' from='%s' to='%s' version='1.0'>]], from_host, to_host));
end
end
end
function xmppserver.disconnect(conn, err)
local session = sessions[conn];
if session then
if err and err ~= "closed" and session.srv_hosts then
(session.log or log)("debug", "s2s connection attempt failed: %s", err);
if s2s_attempt_connect(session, err) then
(session.log or log)("debug", "...so we're going to try another target");
return; -- Session lives for now
end
end
(session.log or log)("info", "s2s disconnected: %s->%s (%s)", tostring(session.from_host), tostring(session.to_host), tostring(err));
s2s_destroy_session(session, err);
sessions[conn] = nil;
session = nil;
collectgarbage("collect");
end
end
function xmppserver.register_outgoing(conn, session)
session.direction = "outgoing";
sessions[conn] = session;
session.reset_stream = session_reset_stream;
session.close = session_close;
session_reset_stream(session); -- Initialise, ready for use
--local function handleerr(err) print("Traceback:", err, debug.traceback()); end
--session.stanza_dispatch = function (stanza) return select(2, xpcall(function () return core_process_stanza(session, stanza); end, handleerr)); end
end
connlisteners_register("xmppserver", xmppserver);
-- We need to perform some initialisation when a connection is created
-- We also need to perform that same initialisation at other points (SASL, TLS, ...)
-- ...and we need to handle data
-- ...and record all sessions associated with connections
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