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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 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 = 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 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");
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
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
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 "<html><body>You really don't look like a BOSH client to me... what do you want?</body></html>";
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.
stream:feed(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 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
if inactive_sessions[session] then
-- Session was marked as inactive, since we have
-- a request open now, unmark it
inactive_sessions[session] = nil;
end
end
return true; -- Inform httpserver we shall reply later
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:streams"] = 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, <stream:error> is: %s", tostring(close_reply));
end
local session_close_response = { headers = default_headers, body = tostring(close_reply) };
--FIXME: Quite sure we shouldn't reply to all requests with the error
for _, held_request in ipairs(session.requests) do
held_request:send(session_close_response);
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));
local close_reply = st.stanza("body", { xmlns = xmlns_bosh, type = "terminate",
["xmlns:streams"] = 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{"<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();
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");
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
session:close();
request.notopen = nil;
return;
end
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
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)
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, 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
return 1;
end
local function setup()
local ports = module:get_option("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
|
