Tue, 09 Mar 2010 18:19:50 +0500
mod_compression: More robust stanza processing.
-- 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; 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