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("xmppclient_listener"); local lxp = require "lxp" local init_xmlhandlers = require "core.xmlhandlers" local sm_new_session = require "core.sessionmanager".new_session; 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 sm_streamopened = sessionmanager.streamopened; local sm_streamclosed = sessionmanager.streamclosed; local st = require "util.stanza"; local stream_callbacks = { stream_tag = "http://etherx.jabber.org/streams\1stream", default_ns = "jabber:client", streamopened = sm_streamopened, streamclosed = sm_streamclosed, handlestanza = core_process_stanza }; function stream_callbacks.error(session, error, data) if error == "no-stream" then session.log("debug", "Invalid opening stream header"); session:close("invalid-namespace"); elseif session.close then (session.log or log)("debug", "Client XML parse error: %s", tostring(error)); session:close("xml-not-well-formed"); end end local function handleerr(err) log("error", "Traceback[c2s]: %s: %s", tostring(err), debug.traceback()); end function stream_callbacks.handlestanza(a, b) xpcall(function () core_process_stanza(a, b) end, handleerr); end local sessions = {}; local xmppclient = { default_port = 5222, 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 log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data, data:sub(1, 300):gsub("[\r\n]+", " "):gsub("[%z\1-\31]", "_")); 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.send("<?xml version='1.0'?>"); session.send(st.stanza("stream:stream", default_stream_attr):top_tag()); end if reason then if type(reason) == "string" then -- assume stream error log("info", "Disconnecting client, <stream:error> is: %s", reason); session.send(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 client, <stream:error> is: %s", tostring(stanza)); session.send(stanza); elseif reason.name then -- a stanza log("info", "Disconnecting client, <stream:error> is: %s", tostring(reason)); session.send(reason); end end end session.send("</stream:stream>"); session.conn.close(); xmppclient.disconnect(session.conn, (reason and (reason.text or reason.condition)) or reason or "session closed"); end end -- End of session methods -- function xmppclient.listener(conn, data) local session = sessions[conn]; if not session then session = sm_new_session(conn); sessions[conn] = session; session.log("info", "Client connected"); -- Client is using legacy SSL (otherwise mod_tls sets this flag) if conn.ssl() then session.secure = true; end 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 xmppclient.disconnect(conn, err) local session = sessions[conn]; if session then (session.log or log)("info", "Client disconnected: %s", err); sm_destroy_session(session, err); sessions[conn] = nil; session = nil; end end connlisteners_register("xmppclient", xmppclient);