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 hosts = _G.hosts; local t_concat = table.concat; local lxp = require "lxp"; local logger = require "util.logger"; local config = require "core.configmanager"; local connlisteners = require "net.connlisteners"; local cm_register_component = require "core.componentmanager".register_component; local cm_deregister_component = require "core.componentmanager".deregister_component; local uuid_gen = require "util.uuid".generate; local sha1 = require "util.hashes".sha1; local st = require "util.stanza"; local init_xmlhandlers = require "core.xmlhandlers"; local sessions = {}; local log = logger.init("componentlistener"); local component_listener = { default_port = 5347; default_mode = "*a"; default_interface = config.get("*", "core", "component_interface") or "127.0.0.1" }; local xmlns_component = 'jabber:component:accept'; --- Callbacks/data for xmlhandlers to handle streams for us --- local stream_callbacks = { stream_tag = "http://etherx.jabber.org/streams\1stream", default_ns = xmlns_component }; function stream_callbacks.error(session, error, data, data2) log("warn", "Error processing component stream: "..tostring(error)); if error == "no-stream" then session:close("invalid-namespace"); elseif error == "xml-parse-error" and data == "unexpected-element-close" then session.log("warn", "Unexpected close of '%s' tag", data2); session:close("xml-not-well-formed"); else session.log("warn", "External component %s XML parse error: %s", tostring(session.host), tostring(error)); session:close("xml-not-well-formed"); end end function stream_callbacks.streamopened(session, attr) if config.get(attr.to, "core", "component_module") ~= "component" then -- Trying to act as a component domain which -- hasn't been configured session:close{ condition = "host-unknown", text = tostring(attr.to).." does not match any configured external components" }; return; end -- Store the original host (this is used for config, etc.) session.user = attr.to; -- Set the host for future reference session.host = config.get(attr.to, "core", "component_address") or attr.to; -- Note that we don't create the internal component -- until after the external component auths successfully session.streamid = uuid_gen(); session.notopen = nil; session.send(st.stanza("stream:stream", { xmlns=xmlns_component, ["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.host }):top_tag()); end function stream_callbacks.streamclosed(session) session.send("</stream:stream>"); session.notopen = true; end local core_process_stanza = core_process_stanza; function stream_callbacks.handlestanza(session, stanza) -- Namespaces are icky. if not stanza.attr.xmlns and stanza.name == "handshake" then stanza.attr.xmlns = xmlns_component; end return core_process_stanza(session, stanza); end --- Closing a component connection 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 component, <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 component, <stream:error> is: %s", tostring(stanza)); session.send(stanza); elseif reason.name then -- a stanza log("info", "Disconnecting component, <stream:error> is: %s", tostring(reason)); session.send(reason); end end end session.send("</stream:stream>"); session.conn.close(); component_listener.disconnect(session.conn, "stream error"); end end --- Component connlistener function component_listener.listener(conn, data) local session = sessions[conn]; if not session then local _send = conn.write; session = { type = "component", conn = conn, send = function (data) return _send(tostring(data)); end }; sessions[conn] = session; -- Logging functions -- local conn_name = "jcp"..tostring(conn):match("[a-f0-9]+$"); session.log = logger.init(conn_name); session.close = session_close; session.log("info", "Incoming Jabber component connection"); 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:close("xml-not-well-formed"); end session.dispatch_stanza = stream_callbacks.handlestanza; end if data then session.data(conn, data); end end function component_listener.disconnect(conn, err) local session = sessions[conn]; if session then (session.log or log)("info", "component disconnected: %s (%s)", tostring(session.host), tostring(err)); if session.host then log("debug", "Deregistering component"); cm_deregister_component(session.host); hosts[session.host].connected = nil; end sessions[conn] = nil; for k in pairs(session) do session[k] = nil; end session = nil; end end connlisteners.register('xmppcomponent', component_listener);