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413 lines
14 KiB
413 lines
14 KiB
-- Prosody IM
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-- Copyright (C) 2008-2010 Matthew Wild
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-- Copyright (C) 2008-2010 Waqas Hussain
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--
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-- This project is MIT/X11 licensed. Please see the
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-- COPYING file in the source package for more information.
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--
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module.host = "*" -- Global module
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local hosts = _G.hosts;
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local lxp = require "lxp";
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local init_xmlhandlers = require "core.xmlhandlers"
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local server = require "net.server";
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local httpserver = require "net.httpserver";
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local sm = require "core.sessionmanager";
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local sm_destroy_session = sm.destroy_session;
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local new_uuid = require "util.uuid".generate;
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local fire_event = prosody.events.fire_event;
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local core_process_stanza = core_process_stanza;
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local st = require "util.stanza";
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local logger = require "util.logger";
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local log = logger.init("mod_bosh");
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local xmlns_streams = "http://etherx.jabber.org/streams";
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local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";
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local xmlns_bosh = "http://jabber.org/protocol/httpbind"; -- (hard-coded into a literal in session.send)
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local stream_callbacks = {
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stream_ns = xmlns_bosh, stream_tag = "body", default_ns = "jabber:client" };
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local BOSH_DEFAULT_HOLD = tonumber(module:get_option("bosh_default_hold")) or 1;
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local BOSH_DEFAULT_INACTIVITY = tonumber(module:get_option("bosh_max_inactivity")) or 60;
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local BOSH_DEFAULT_POLLING = tonumber(module:get_option("bosh_max_polling")) or 5;
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local BOSH_DEFAULT_REQUESTS = tonumber(module:get_option("bosh_max_requests")) or 2;
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local BOSH_DEFAULT_MAXPAUSE = tonumber(module:get_option("bosh_max_pause")) or 300;
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local consider_bosh_secure = module:get_option_boolean("consider_bosh_secure");
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local default_headers = { ["Content-Type"] = "text/xml; charset=utf-8" };
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local cross_domain = module:get_option("cross_domain_bosh");
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if cross_domain then
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default_headers["Access-Control-Allow-Methods"] = "GET, POST, OPTIONS";
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default_headers["Access-Control-Allow-Headers"] = "Content-Type";
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default_headers["Access-Control-Max-Age"] = "7200";
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if cross_domain == true then
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default_headers["Access-Control-Allow-Origin"] = "*";
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elseif type(cross_domain) == "table" then
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cross_domain = table.concat(cross_domain, ", ");
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end
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if type(cross_domain) == "string" then
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default_headers["Access-Control-Allow-Origin"] = cross_domain;
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end
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end
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local trusted_proxies = module:get_option_set("trusted_proxies", {"127.0.0.1"})._items;
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local function get_ip_from_request(request)
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local ip = request.handler:ip();
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local forwarded_for = request.headers["x-forwarded-for"];
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if forwarded_for then
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forwarded_for = forwarded_for..", "..ip;
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for forwarded_ip in forwarded_for:gmatch("[^%s,]+") do
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if not trusted_proxies[forwarded_ip] then
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ip = forwarded_ip;
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end
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end
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end
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return ip;
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end
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local t_insert, t_remove, t_concat = table.insert, table.remove, table.concat;
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local os_time = os.time;
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local sessions = {};
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local inactive_sessions = {}; -- Sessions which have no open requests
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-- Used to respond to idle sessions (those with waiting requests)
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local waiting_requests = {};
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function on_destroy_request(request)
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waiting_requests[request] = nil;
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local session = sessions[request.sid];
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if session then
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local requests = session.requests;
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for i,r in ipairs(requests) do
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if r == request then
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t_remove(requests, i);
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break;
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end
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end
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-- If this session now has no requests open, mark it as inactive
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if #requests == 0 and session.bosh_max_inactive and not inactive_sessions[session] then
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inactive_sessions[session] = os_time();
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(session.log or log)("debug", "BOSH session marked as inactive at %d", inactive_sessions[session]);
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end
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end
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end
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function handle_request(method, body, request)
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if (not body) or request.method ~= "POST" then
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if request.method == "OPTIONS" then
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return { headers = default_headers, body = "" };
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else
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return "<html><body>You really don't look like a BOSH client to me... what do you want?</body></html>";
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end
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end
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if not method then
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log("debug", "Request %s suffered error %s", tostring(request.id), body);
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return;
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end
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--log("debug", "Handling new request %s: %s\n----------", request.id, tostring(body));
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request.notopen = true;
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request.log = log;
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request.on_destroy = on_destroy_request;
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local parser = lxp.new(init_xmlhandlers(request, stream_callbacks), "\1");
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parser:parse(body);
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local session = sessions[request.sid];
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if session then
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local r = session.requests;
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log("debug", "Session %s has %d out of %d requests open", request.sid, #r, session.bosh_hold);
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log("debug", "and there are %d things in the send_buffer", #session.send_buffer);
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if #r > session.bosh_hold then
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-- We are holding too many requests, send what's in the buffer,
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log("debug", "We are holding too many requests, so...");
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if #session.send_buffer > 0 then
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log("debug", "...sending what is in the buffer")
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session.send(t_concat(session.send_buffer));
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session.send_buffer = {};
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else
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-- or an empty response
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log("debug", "...sending an empty response");
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session.send("");
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end
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elseif #session.send_buffer > 0 then
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log("debug", "Session has data in the send buffer, will send now..");
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local resp = t_concat(session.send_buffer);
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session.send_buffer = {};
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session.send(resp);
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end
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if not request.destroyed then
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-- We're keeping this request open, to respond later
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log("debug", "Have nothing to say, so leaving request unanswered for now");
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if session.bosh_wait then
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request.reply_before = os_time() + session.bosh_wait;
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waiting_requests[request] = true;
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end
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if inactive_sessions[session] then
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-- Session was marked as inactive, since we have
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-- a request open now, unmark it
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inactive_sessions[session] = nil;
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end
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end
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return true; -- Inform httpserver we shall reply later
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end
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end
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local function bosh_reset_stream(session) session.notopen = true; end
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local stream_xmlns_attr = { xmlns = "urn:ietf:params:xml:ns:xmpp-streams" };
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local function bosh_close_stream(session, reason)
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(session.log or log)("info", "BOSH client disconnected");
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local close_reply = st.stanza("body", { xmlns = xmlns_bosh, type = "terminate",
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["xmlns:streams"] = xmlns_streams });
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if reason then
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close_reply.attr.condition = "remote-stream-error";
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if type(reason) == "string" then -- assume stream error
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close_reply:tag("stream:error")
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:tag(reason, {xmlns = xmlns_xmpp_streams});
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elseif type(reason) == "table" then
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if reason.condition then
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close_reply:tag("stream:error")
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:tag(reason.condition, stream_xmlns_attr):up();
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if reason.text then
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close_reply:tag("text", stream_xmlns_attr):text(reason.text):up();
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end
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if reason.extra then
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close_reply:add_child(reason.extra);
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end
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elseif reason.name then -- a stanza
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close_reply = reason;
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end
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end
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log("info", "Disconnecting client, <stream:error> is: %s", tostring(close_reply));
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end
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local session_close_response = { headers = default_headers, body = tostring(close_reply) };
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--FIXME: Quite sure we shouldn't reply to all requests with the error
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for _, held_request in ipairs(session.requests) do
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held_request:send(session_close_response);
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held_request:destroy();
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end
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sessions[session.sid] = nil;
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sm_destroy_session(session);
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end
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function stream_callbacks.streamopened(request, attr)
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log("debug", "BOSH body open (sid: %s)", attr.sid);
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local sid = attr.sid
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if not sid then
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-- New session request
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request.notopen = nil; -- Signals that we accept this opening tag
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-- TODO: Sanity checks here (rid, to, known host, etc.)
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if not hosts[attr.to] then
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-- Unknown host
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log("debug", "BOSH client tried to connect to unknown host: %s", tostring(attr.to));
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local close_reply = st.stanza("body", { xmlns = xmlns_bosh, type = "terminate",
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["xmlns:streams"] = xmlns_streams, condition = "host-unknown" });
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request:send(tostring(close_reply));
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return;
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end
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-- New session
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sid = new_uuid();
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local session = {
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type = "c2s_unauthed", conn = {}, sid = sid, rid = tonumber(attr.rid), host = attr.to,
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bosh_version = attr.ver, bosh_wait = attr.wait, streamid = sid,
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bosh_hold = BOSH_DEFAULT_HOLD, bosh_max_inactive = BOSH_DEFAULT_INACTIVITY,
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requests = { }, send_buffer = {}, reset_stream = bosh_reset_stream,
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close = bosh_close_stream, dispatch_stanza = core_process_stanza,
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log = logger.init("bosh"..sid), secure = consider_bosh_secure or request.secure,
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ip = get_ip_from_request(request);
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};
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sessions[sid] = session;
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session.log("debug", "BOSH session created for request from %s", session.ip);
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log("info", "New BOSH session, assigned it sid '%s'", sid);
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local r, send_buffer = session.requests, session.send_buffer;
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local response = { headers = default_headers }
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function session.send(s)
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-- We need to ensure that outgoing stanzas have the jabber:client xmlns
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if s.attr and not s.attr.xmlns then
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s = st.clone(s);
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s.attr.xmlns = "jabber:client";
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end
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--log("debug", "Sending BOSH data: %s", tostring(s));
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local oldest_request = r[1];
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if oldest_request then
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log("debug", "We have an open request, so sending on that");
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response.body = t_concat{"<body xmlns='http://jabber.org/protocol/httpbind' sid='", sid, "' xmlns:stream = 'http://etherx.jabber.org/streams'>", tostring(s), "</body>" };
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oldest_request:send(response);
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--log("debug", "Sent");
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if oldest_request.stayopen then
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if #r>1 then
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-- Move front request to back
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t_insert(r, oldest_request);
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t_remove(r, 1);
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end
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else
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log("debug", "Destroying the request now...");
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oldest_request:destroy();
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end
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elseif s ~= "" then
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log("debug", "Saved to send buffer because there are %d open requests", #r);
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-- Hmm, no requests are open :(
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t_insert(session.send_buffer, tostring(s));
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log("debug", "There are now %d things in the send_buffer", #session.send_buffer);
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end
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end
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-- Send creation response
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local features = st.stanza("stream:features");
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hosts[session.host].events.fire_event("stream-features", { origin = session, features = features });
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fire_event("stream-features", session, features);
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--xmpp:version='1.0' xmlns:xmpp='urn:xmpp:xbosh'
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local response = st.stanza("body", { xmlns = xmlns_bosh,
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inactivity = tostring(BOSH_DEFAULT_INACTIVITY), polling = tostring(BOSH_DEFAULT_POLLING), requests = tostring(BOSH_DEFAULT_REQUESTS), hold = tostring(session.bosh_hold), maxpause = "120",
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sid = sid, authid = sid, ver = '1.6', from = session.host, secure = 'true', ["xmpp:version"] = "1.0",
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["xmlns:xmpp"] = "urn:xmpp:xbosh", ["xmlns:stream"] = "http://etherx.jabber.org/streams" }):add_child(features);
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request:send{ headers = default_headers, body = tostring(response) };
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request.sid = sid;
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return;
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end
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local session = sessions[sid];
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if not session then
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-- Unknown sid
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log("info", "Client tried to use sid '%s' which we don't know about", sid);
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request:send{ headers = default_headers, body = tostring(st.stanza("body", { xmlns = xmlns_bosh, type = "terminate", condition = "item-not-found" })) };
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request.notopen = nil;
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return;
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end
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if session.rid then
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local rid = tonumber(attr.rid);
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local diff = rid - session.rid;
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if diff > 1 then
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session.log("warn", "rid too large (means a request was lost). Last rid: %d New rid: %s", session.rid, attr.rid);
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elseif diff <= 0 then
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-- Repeated, ignore
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session.log("debug", "rid repeated (on request %s), ignoring: %s (diff %d)", request.id, session.rid, diff);
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request.notopen = nil;
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request.ignore = true;
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request.sid = sid;
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t_insert(session.requests, request);
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return;
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end
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session.rid = rid;
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end
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if attr.type == "terminate" then
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-- Client wants to end this session
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session:close();
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request.notopen = nil;
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return;
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end
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if session.notopen then
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local features = st.stanza("stream:features");
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hosts[session.host].events.fire_event("stream-features", { origin = session, features = features });
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fire_event("stream-features", session, features);
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session.send(features);
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session.notopen = nil;
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end
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request.notopen = nil; -- Signals that we accept this opening tag
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t_insert(session.requests, request);
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request.sid = sid;
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end
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function stream_callbacks.handlestanza(request, stanza)
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if request.ignore then return; end
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log("debug", "BOSH stanza received: %s\n", stanza:top_tag());
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local session = sessions[request.sid];
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if session then
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if stanza.attr.xmlns == xmlns_bosh then
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stanza.attr.xmlns = nil;
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end
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core_process_stanza(session, stanza);
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end
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end
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function stream_callbacks.error(request, error)
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log("debug", "Error parsing BOSH request payload; %s", error);
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if not request.sid then
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request:send({ headers = default_headers, status = "400 Bad Request" });
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return;
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end
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local session = sessions[request.sid];
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if error == "stream-error" then -- Remote stream error, we close normally
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session:close();
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else
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session:close({ condition = "bad-format", text = "Error processing stream" });
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end
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end
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local dead_sessions = {};
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function on_timer()
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-- log("debug", "Checking for requests soon to timeout...");
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-- Identify requests timing out within the next few seconds
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local now = os_time() + 3;
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for request in pairs(waiting_requests) do
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if request.reply_before <= now then
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log("debug", "%s was soon to timeout, sending empty response", request.id);
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-- Send empty response to let the
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-- client know we're still here
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if request.conn then
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sessions[request.sid].send("");
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end
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end
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end
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now = now - 3;
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local n_dead_sessions = 0;
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for session, inactive_since in pairs(inactive_sessions) do
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if session.bosh_max_inactive then
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if now - inactive_since > session.bosh_max_inactive then
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(session.log or log)("debug", "BOSH client inactive too long, destroying session at %d", now);
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sessions[session.sid] = nil;
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inactive_sessions[session] = nil;
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n_dead_sessions = n_dead_sessions + 1;
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dead_sessions[n_dead_sessions] = session;
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end
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else
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inactive_sessions[session] = nil;
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end
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end
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for i=1,n_dead_sessions do
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local session = dead_sessions[i];
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dead_sessions[i] = nil;
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sm_destroy_session(session, "BOSH client silent for over "..session.bosh_max_inactive.." seconds");
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end
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end
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local function setup()
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local ports = module:get_option("bosh_ports") or { 5280 };
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httpserver.new_from_config(ports, handle_request, { base = "http-bind" });
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server.addtimer(on_timer);
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end
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if prosody.start_time then -- already started
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setup();
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else
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prosody.events.add_handler("server-started", setup);
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end
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