-- 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 new_xmpp_stream = require "util.xmppstream".new; 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 = prosody.events.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 timer = require "util.timer"; local xmlns_streams = "http://etherx.jabber.org/streams"; local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams"; local xmlns_bosh = "http://jabber.org/protocol/httpbind"; -- (hard-coded into a literal in session.send) local stream_callbacks = { stream_ns = xmlns_bosh, stream_tag = "body", default_ns = "jabber:client" }; local BOSH_DEFAULT_HOLD = module:get_option_number("bosh_default_hold", 1); local BOSH_DEFAULT_INACTIVITY = module:get_option_number("bosh_max_inactivity", 60); local BOSH_DEFAULT_POLLING = module:get_option_number("bosh_max_polling", 5); local BOSH_DEFAULT_REQUESTS = module:get_option_number("bosh_max_requests", 2); local consider_bosh_secure = module:get_option_boolean("consider_bosh_secure"); local default_headers = { ["Content-Type"] = "text/xml; charset=utf-8" }; local cross_domain = module:get_option("cross_domain_bosh", false); if cross_domain then default_headers["Access-Control-Allow-Methods"] = "GET, POST, OPTIONS"; default_headers["Access-Control-Allow-Headers"] = "Content-Type"; default_headers["Access-Control-Max-Age"] = "7200"; if cross_domain == true then default_headers["Access-Control-Allow-Origin"] = "*"; elseif type(cross_domain) == "table" then cross_domain = table.concat(cross_domain, ", "); end if type(cross_domain) == "string" then default_headers["Access-Control-Allow-Origin"] = cross_domain; end end local trusted_proxies = module:get_option_set("trusted_proxies", {"127.0.0.1"})._items; local function get_ip_from_request(request) local ip = request.handler:ip(); local forwarded_for = request.headers["x-forwarded-for"]; if forwarded_for then forwarded_for = forwarded_for..", "..ip; for forwarded_ip in forwarded_for:gmatch("[^%s,]+") do if not trusted_proxies[forwarded_ip] then ip = forwarded_ip; end end end return ip; end 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 local max_inactive = session.bosh_max_inactive; if max_inactive and #requests == 0 then inactive_sessions[session] = os_time() + max_inactive; (session.log or log)("debug", "BOSH session marked as inactive (for %ds)", max_inactive); end end end function handle_request(method, body, request) if (not body) or request.method ~= "POST" then if request.method == "OPTIONS" then local headers = {}; for k,v in pairs(default_headers) do headers[k] = v; end headers["Content-Type"] = nil; return { headers = headers, body = "" }; else return "You really don't look like a BOSH client to me... what do you want?"; end 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; request.on_destroy = on_destroy_request; local stream = new_xmpp_stream(request, stream_callbacks); -- stream:feed() calls the stream_callbacks, so all stanzas in -- the body are processed in this next line before it returns. -- In particular, the streamopened() stream callback is where -- much of the session logic happens, because it's where we first -- get to see the 'sid' of this request. stream:feed(body); -- Stanzas (if any) in the request have now been processed, and -- we take care of the high-level BOSH logic here, including -- giving a response or putting the request "on hold". local session = sessions[request.sid]; if session then -- Session was marked as inactive, since we have -- a request open now, unmark it if inactive_sessions[session] and #session.requests > 0 then inactive_sessions[session] = nil; end 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 then -- We're keeping this request open, to respond later log("debug", "Have nothing to say, so leaving request unanswered for now"); if session.bosh_wait then request.reply_before = os_time() + session.bosh_wait; waiting_requests[request] = true; end end if session.bosh_terminate then session.log("debug", "Closing session with %d requests open", #session.requests); session:close(); return nil; else return true; -- Inform httpserver we shall reply later end end end local function bosh_reset_stream(session) session.notopen = true; end local stream_xmlns_attr = { xmlns = "urn:ietf:params:xml:ns:xmpp-streams" }; local function bosh_close_stream(session, reason) (session.log or log)("info", "BOSH client disconnected"); local close_reply = st.stanza("body", { xmlns = xmlns_bosh, type = "terminate", ["xmlns:stream"] = xmlns_streams }); if reason then close_reply.attr.condition = "remote-stream-error"; if type(reason) == "string" then -- assume stream error close_reply:tag("stream:error") :tag(reason, {xmlns = xmlns_xmpp_streams}); elseif type(reason) == "table" then if reason.condition then close_reply:tag("stream:error") :tag(reason.condition, stream_xmlns_attr):up(); if reason.text then close_reply:tag("text", stream_xmlns_attr):text(reason.text):up(); end if reason.extra then close_reply:add_child(reason.extra); end elseif reason.name then -- a stanza close_reply = reason; end end log("info", "Disconnecting client, is: %s", tostring(close_reply)); end local session_close_response = { headers = default_headers, body = tostring(close_reply) }; for _, held_request in ipairs(session.requests) do held_request:send(session_close_response); held_request:destroy(); end sessions[session.sid] = nil; inactive_sessions[session] = nil; sm_destroy_session(session); end -- Handle the tag in the request payload. function stream_callbacks.streamopened(request, attr) local sid = attr.sid; log("debug", "BOSH body open (sid: %s)", sid or ""); 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)); local close_reply = st.stanza("body", { xmlns = xmlns_bosh, type = "terminate", ["xmlns:stream"] = xmlns_streams, condition = "host-unknown" }); request:send(tostring(close_reply)); return; end -- New session sid = new_uuid(); local session = { type = "c2s_unauthed", conn = {}, sid = sid, rid = tonumber(attr.rid), 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 = consider_bosh_secure or request.secure, ip = get_ip_from_request(request); }; sessions[sid] = session; session.log("debug", "BOSH session created for request from %s", session.ip); 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) -- We need to ensure that outgoing stanzas have the jabber:client xmlns if s.attr and not s.attr.xmlns then s = st.clone(s); s.attr.xmlns = "jabber:client"; end --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({ "", tostring(s), "" }); 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(); 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 return true; end -- Send creation response local features = st.stanza("stream:features"); hosts[session.host].events.fire_event("stream-features", { origin = session, features = features }); fire_event("stream-features", session, features); --xmpp:version='1.0' xmlns:xmpp='urn:xmpp:xbosh' local response = st.stanza("body", { xmlns = xmlns_bosh, wait = attr.wait, inactivity = tostring(BOSH_DEFAULT_INACTIVITY), polling = tostring(BOSH_DEFAULT_POLLING), requests = tostring(BOSH_DEFAULT_REQUESTS), hold = tostring(session.bosh_hold), 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.ignore = true; 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, which we'll do -- after processing any stanzas in this request session.bosh_terminate = true; end request.notopen = nil; -- Signals that we accept this opening tag t_insert(session.requests, request); request.sid = sid; if session.notopen then local features = st.stanza("stream:features"); hosts[session.host].events.fire_event("stream-features", { origin = session, features = features }); fire_event("stream-features", session, features); session.send(features); session.notopen = nil; end end function stream_callbacks.handlestanza(request, stanza) if request.ignore then return; end 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 core_process_stanza(session, stanza); end end function stream_callbacks.error(request, error) log("debug", "Error parsing BOSH request payload; %s", error); if not request.sid then request:send({ headers = default_headers, status = "400 Bad Request" }); return; end local session = sessions[request.sid]; if error == "stream-error" then -- Remote stream error, we close normally session:close(); else session:close({ condition = "bad-format", text = "Error processing stream" }); 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, close_after in pairs(inactive_sessions) do if close_after < now 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 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 return 1; end local function setup() local ports = module:get_option_array("bosh_ports") or { 5280 }; httpserver.new_from_config(ports, handle_request, { base = "http-bind" }); timer.add_task(1, on_timer); end if prosody.start_time then -- already started setup(); else prosody.events.add_handler("server-started", setup); end