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|
-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
module.host = "*" -- Global module
local hosts = _G.hosts;
local lxp = require "lxp";
local init_xmlhandlers = require "core.xmlhandlers"
local server = require "net.server";
local httpserver = require "net.httpserver";
local sm = require "core.sessionmanager";
local sm_destroy_session = sm.destroy_session;
local new_uuid = require "util.uuid".generate;
local fire_event = require "core.eventmanager".fire_event;
local core_process_stanza = core_process_stanza;
local st = require "util.stanza";
local logger = require "util.logger";
local log = logger.init("mod_bosh");
local xmlns_bosh = "http://jabber.org/protocol/httpbind"; -- (hard-coded into a literal in session.send)
local stream_callbacks = { stream_tag = "http://jabber.org/protocol/httpbind\1body", default_ns = "jabber:client" };
local BOSH_DEFAULT_HOLD = tonumber(module:get_option("bosh_default_hold")) or 1;
local BOSH_DEFAULT_INACTIVITY = tonumber(module:get_option("bosh_max_inactivity")) or 60;
local BOSH_DEFAULT_POLLING = tonumber(module:get_option("bosh_max_polling")) or 5;
local BOSH_DEFAULT_REQUESTS = tonumber(module:get_option("bosh_max_requests")) or 2;
local BOSH_DEFAULT_MAXPAUSE = tonumber(module:get_option("bosh_max_pause")) or 300;
local default_headers = { ["Content-Type"] = "text/xml; charset=utf-8" };
local session_close_reply = { headers = default_headers, body = st.stanza("body", { xmlns = xmlns_bosh, type = "terminate" }), attr = {} };
local t_insert, t_remove, t_concat = table.insert, table.remove, table.concat;
local os_time = os.time;
local sessions = {};
local inactive_sessions = {}; -- Sessions which have no open requests
-- Used to respond to idle sessions (those with waiting requests)
local waiting_requests = {};
function on_destroy_request(request)
waiting_requests[request] = nil;
local session = sessions[request.sid];
if session then
local requests = session.requests;
for i,r in ipairs(requests) do
if r == request then
t_remove(requests, i);
break;
end
end
-- If this session now has no requests open, mark it as inactive
if #requests == 0 and session.bosh_max_inactive and not inactive_sessions[session] then
inactive_sessions[session] = os_time();
(session.log or log)("debug", "BOSH session marked as inactive at %d", inactive_sessions[session]);
end
end
end
function handle_request(method, body, request)
if (not body) or request.method ~= "POST" then
return "<html><body>You really don't look like a BOSH client to me... what do you want?</body></html>";
end
if not method then
log("debug", "Request %s suffered error %s", tostring(request.id), body);
return;
end
--log("debug", "Handling new request %s: %s\n----------", request.id, tostring(body));
request.notopen = true;
request.log = log;
local parser = lxp.new(init_xmlhandlers(request, stream_callbacks), "\1");
parser:parse(body);
local session = sessions[request.sid];
if session then
local r = session.requests;
log("debug", "Session %s has %d out of %d requests open", request.sid, #r, session.bosh_hold);
log("debug", "and there are %d things in the send_buffer", #session.send_buffer);
if #r > session.bosh_hold then
-- We are holding too many requests, send what's in the buffer,
log("debug", "We are holding too many requests, so...");
if #session.send_buffer > 0 then
log("debug", "...sending what is in the buffer")
session.send(t_concat(session.send_buffer));
session.send_buffer = {};
else
-- or an empty response
log("debug", "...sending an empty response");
session.send("");
end
elseif #session.send_buffer > 0 then
log("debug", "Session has data in the send buffer, will send now..");
local resp = t_concat(session.send_buffer);
session.send_buffer = {};
session.send(resp);
end
if not request.destroyed and session.bosh_wait then
request.reply_before = os_time() + session.bosh_wait;
request.on_destroy = on_destroy_request;
waiting_requests[request] = true;
end
log("debug", "Have nothing to say, so leaving request unanswered for now");
return true;
end
end
local function bosh_reset_stream(session) session.notopen = true; end
local function bosh_close_stream(session, reason)
(session.log or log)("info", "BOSH client disconnected");
session_close_reply.attr.condition = reason;
for _, held_request in ipairs(session.requests) do
held_request:send(session_close_reply);
held_request:destroy();
end
sessions[session.sid] = nil;
sm_destroy_session(session);
end
function stream_callbacks.streamopened(request, attr)
log("debug", "BOSH body open (sid: %s)", attr.sid);
local sid = attr.sid
if not sid then
-- New session request
request.notopen = nil; -- Signals that we accept this opening tag
-- TODO: Sanity checks here (rid, to, known host, etc.)
if not hosts[attr.to] then
-- Unknown host
log("debug", "BOSH client tried to connect to unknown host: %s", tostring(attr.to));
session_close_reply.body.attr.condition = "host-unknown";
request:send(session_close_reply);
request.notopen = nil
return;
end
-- New session
sid = new_uuid();
local session = { type = "c2s_unauthed", conn = {}, sid = sid, rid = tonumber(attr.rid)-1, host = attr.to, bosh_version = attr.ver, bosh_wait = attr.wait, streamid = sid,
bosh_hold = BOSH_DEFAULT_HOLD, bosh_max_inactive = BOSH_DEFAULT_INACTIVITY,
requests = { }, send_buffer = {}, reset_stream = bosh_reset_stream, close = bosh_close_stream,
dispatch_stanza = core_process_stanza, log = logger.init("bosh"..sid), secure = request.secure };
sessions[sid] = session;
log("info", "New BOSH session, assigned it sid '%s'", sid);
local r, send_buffer = session.requests, session.send_buffer;
local response = { headers = default_headers }
function session.send(s)
--log("debug", "Sending BOSH data: %s", tostring(s));
local oldest_request = r[1];
if oldest_request then
log("debug", "We have an open request, so sending on that");
response.body = t_concat{"<body xmlns='http://jabber.org/protocol/httpbind' sid='", sid, "' xmlns:stream = 'http://etherx.jabber.org/streams'>", tostring(s), "</body>" };
oldest_request:send(response);
--log("debug", "Sent");
if oldest_request.stayopen then
if #r>1 then
-- Move front request to back
t_insert(r, oldest_request);
t_remove(r, 1);
end
else
log("debug", "Destroying the request now...");
oldest_request:destroy();
t_remove(r, 1);
end
elseif s ~= "" then
log("debug", "Saved to send buffer because there are %d open requests", #r);
-- Hmm, no requests are open :(
t_insert(session.send_buffer, tostring(s));
log("debug", "There are now %d things in the send_buffer", #session.send_buffer);
end
end
-- Send creation response
local features = st.stanza("stream:features");
fire_event("stream-features", session, features);
--xmpp:version='1.0' xmlns:xmpp='urn:xmpp:xbosh'
local response = st.stanza("body", { xmlns = xmlns_bosh,
inactivity = tostring(BOSH_DEFAULT_INACTIVITY), polling = tostring(BOSH_DEFAULT_POLLING), requests = tostring(BOSH_DEFAULT_REQUESTS), hold = tostring(session.bosh_hold), maxpause = "120",
sid = sid, authid = sid, ver = '1.6', from = session.host, secure = 'true', ["xmpp:version"] = "1.0",
["xmlns:xmpp"] = "urn:xmpp:xbosh", ["xmlns:stream"] = "http://etherx.jabber.org/streams" }):add_child(features);
request:send{ headers = default_headers, body = tostring(response) };
request.sid = sid;
return;
end
local session = sessions[sid];
if not session then
-- Unknown sid
log("info", "Client tried to use sid '%s' which we don't know about", sid);
request:send{ headers = default_headers, body = tostring(st.stanza("body", { xmlns = xmlns_bosh, type = "terminate", condition = "item-not-found" })) };
request.notopen = nil;
return;
end
if session.rid then
local rid = tonumber(attr.rid);
local diff = rid - session.rid;
if diff > 1 then
session.log("warn", "rid too large (means a request was lost). Last rid: %d New rid: %s", session.rid, attr.rid);
elseif diff <= 0 then
-- Repeated, ignore
session.log("debug", "rid repeated (on request %s), ignoring: %s (diff %d)", request.id, session.rid, diff);
request.notopen = nil;
request.sid = sid;
t_insert(session.requests, request);
return;
end
session.rid = rid;
end
if attr.type == "terminate" then
-- Client wants to end this session
session:close();
request.notopen = nil;
return;
end
-- If session was inactive, make sure it is now marked as not
if #session.requests == 0 then
(session.log or log)("debug", "BOSH client now active again at %d", os_time());
inactive_sessions[session] = nil;
end
if session.notopen then
local features = st.stanza("stream:features");
fire_event("stream-features", session, features);
session.send(features);
session.notopen = nil;
end
request.notopen = nil; -- Signals that we accept this opening tag
t_insert(session.requests, request);
request.sid = sid;
end
function stream_callbacks.handlestanza(request, stanza)
log("debug", "BOSH stanza received: %s\n", stanza:top_tag());
local session = sessions[request.sid];
if session then
if stanza.attr.xmlns == xmlns_bosh then
stanza.attr.xmlns = nil;
end
session.ip = request.handler.ip();
core_process_stanza(session, stanza);
end
end
local dead_sessions = {};
function on_timer()
-- log("debug", "Checking for requests soon to timeout...");
-- Identify requests timing out within the next few seconds
local now = os_time() + 3;
for request in pairs(waiting_requests) do
if request.reply_before <= now then
log("debug", "%s was soon to timeout, sending empty response", request.id);
-- Send empty response to let the
-- client know we're still here
if request.conn then
sessions[request.sid].send("");
end
end
end
now = now - 3;
local n_dead_sessions = 0;
for session, inactive_since in pairs(inactive_sessions) do
if session.bosh_max_inactive then
if now - inactive_since > session.bosh_max_inactive then
(session.log or log)("debug", "BOSH client inactive too long, destroying session at %d", now);
sessions[session.sid] = nil;
inactive_sessions[session] = nil;
n_dead_sessions = n_dead_sessions + 1;
dead_sessions[n_dead_sessions] = session;
end
else
inactive_sessions[session] = nil;
end
end
for i=1,n_dead_sessions do
local session = dead_sessions[i];
dead_sessions[i] = nil;
sm_destroy_session(session, "BOSH client silent for over "..session.bosh_max_inactive.." seconds");
end
end
local ports = module:get_option("bosh_ports") or { 5280 };
httpserver.new_from_config(ports, handle_request, { base = "http-bind" });
server.addtimer(on_timer);
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