2 -- Copyright (C) 2008-2009 Matthew Wild
3 -- Copyright (C) 2008-2009 Waqas Hussain
5 -- This project is MIT/X11 licensed. Please see the
6 -- COPYING file in the source package for more information.
11 local logger = require "logger";
12 local log = logger.init("xmppserver_listener");
13 local lxp = require "lxp"
14 local init_xmlhandlers = require "core.xmlhandlers"
15 local s2s_new_incoming = require "core.s2smanager".new_incoming;
16 local s2s_streamopened = require "core.s2smanager".streamopened;
17 local s2s_streamclosed = require "core.s2smanager".streamclosed;
18 local s2s_destroy_session = require "core.s2smanager".destroy_session;
19 local s2s_attempt_connect = require "core.s2smanager".attempt_connection;
20 local stream_callbacks = { stream_tag = "http://etherx.jabber.org/streams\1stream",
21 default_ns = "jabber:server",
22 streamopened = s2s_streamopened, streamclosed = s2s_streamclosed, handlestanza = core_process_stanza };
24 function stream_callbacks.error(session, error, data)
25 if error == "no-stream" then
26 session:close("invalid-namespace");
28 session.log("debug", "Server-to-server XML parse error: %s", tostring(error));
29 session:close("xml-not-well-formed");
33 local function handleerr(err) log("error", "Traceback[s2s]: %s: %s", tostring(err), debug.traceback()); end
34 function stream_callbacks.handlestanza(a, b)
35 xpcall(function () core_process_stanza(a, b) end, handleerr);
38 local connlisteners_register = require "net.connlisteners".register;
40 local t_insert = table.insert;
41 local t_concat = table.concat;
42 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
43 local m_random = math.random;
44 local format = string.format;
45 local sessionmanager = require "core.sessionmanager";
46 local sm_new_session, sm_destroy_session = sessionmanager.new_session, sessionmanager.destroy_session;
47 local st = require "util.stanza";
50 local xmppserver = { default_port = 5269, default_mode = "*a" };
52 -- These are session methods --
54 local function session_reset_stream(session)
56 local parser = lxp.new(init_xmlhandlers(session, stream_callbacks), "\1");
57 session.parser = parser;
59 session.notopen = true;
61 function session.data(conn, data)
62 local ok, err = parser:parse(data);
63 if ok then return; end
64 (session.log or log)("warn", "Received invalid XML: %s", data);
65 (session.log or log)("warn", "Problem was: %s", err);
66 session:close("xml-not-well-formed");
72 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
73 local default_stream_attr = { ["xmlns:stream"] = stream_callbacks.stream_tag:match("[^\1]*"), xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
74 local function session_close(session, reason)
75 local log = session.log or log;
77 if session.notopen then
78 session.sends2s("<?xml version='1.0'?>");
79 session.sends2s(st.stanza("stream:stream", default_stream_attr):top_tag());
82 if type(reason) == "string" then -- assume stream error
83 log("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, reason);
84 session.sends2s(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
85 elseif type(reason) == "table" then
86 if reason.condition then
87 local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
89 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
92 stanza:add_child(reason.extra);
94 log("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, tostring(stanza));
95 session.sends2s(stanza);
96 elseif reason.name then -- a stanza
97 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));
98 session.sends2s(reason);
102 session.sends2s("</stream:stream>");
103 if session.notopen or not session.conn.close() then
104 session.conn.close(true); -- Force FIXME: timer?
106 session.conn.close();
107 xmppserver.disconnect(session.conn, "stream error");
112 -- End of session methods --
114 function xmppserver.listener(conn, data)
115 local session = sessions[conn];
117 session = s2s_new_incoming(conn);
118 sessions[conn] = session;
120 -- Logging functions --
123 local conn_name = "s2sin"..tostring(conn):match("[a-f0-9]+$");
124 session.log = logger.init(conn_name);
126 session.log("info", "Incoming s2s connection");
128 session.reset_stream = session_reset_stream;
129 session.close = session_close;
131 session_reset_stream(session); -- Initialise, ready for use
133 session.dispatch_stanza = stream_callbacks.handlestanza;
136 session.data(conn, data);
140 function xmppserver.status(conn, status)
141 if status == "ssl-handshake-complete" then
142 local session = sessions[conn];
143 if session and session.direction == "outgoing" then
144 local format, to_host, from_host = string.format, session.to_host, session.from_host;
145 session.log("debug", "Sending stream header...");
146 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));
151 function xmppserver.disconnect(conn, err)
152 local session = sessions[conn];
154 if err and err ~= "closed" and session.srv_hosts then
155 (session.log or log)("debug", "s2s connection attempt failed: %s", err);
156 if s2s_attempt_connect(session, err) then
157 (session.log or log)("debug", "...so we're going to try another target");
158 return; -- Session lives for now
161 (session.log or log)("info", "s2s disconnected: %s->%s (%s)", tostring(session.from_host), tostring(session.to_host), tostring(err));
162 s2s_destroy_session(session, err);
163 sessions[conn] = nil;
165 collectgarbage("collect");
169 function xmppserver.register_outgoing(conn, session)
170 session.direction = "outgoing";
171 sessions[conn] = session;
173 session.reset_stream = session_reset_stream;
174 session.close = session_close;
175 session_reset_stream(session); -- Initialise, ready for use
177 --local function handleerr(err) print("Traceback:", err, debug.traceback()); end
178 --session.stanza_dispatch = function (stanza) return select(2, xpcall(function () return core_process_stanza(session, stanza); end, handleerr)); end
181 connlisteners_register("xmppserver", xmppserver);
184 -- We need to perform some initialisation when a connection is created
185 -- We also need to perform that same initialisation at other points (SASL, TLS, ...)
187 -- ...and we need to handle data
188 -- ...and record all sessions associated with connections