2 -- The code in this file should be self-explanatory, though the logic is horrible
3 -- for more info on that, see doc/stanza_routing.txt, which attempts to condense
4 -- the rules from the RFCs (mainly 3921)
6 require "core.servermanager"
8 local log = require "util.logger".init("stanzarouter")
10 local st = require "util.stanza";
11 local send_s2s = require "core.s2smanager".send_to_host;
12 local user_exists = require "core.usermanager".user_exists;
14 local rostermanager = require "core.rostermanager";
15 local sessionmanager = require "core.sessionmanager";
16 local offlinemanager = require "core.offlinemanager";
18 local s2s_verify_dialback = require "core.s2smanager".verify_dialback;
19 local s2s_make_authenticated = require "core.s2smanager".make_authenticated;
21 local modules_handle_stanza = require "core.modulemanager".handle_stanza;
22 local component_handle_stanza = require "core.componentmanager".handle_stanza;
24 local format = string.format;
25 local tostring = tostring;
26 local t_concat = table.concat;
27 local t_insert = table.insert;
28 local tonumber = tonumber;
29 local s_find = string.find;
31 local jid_split = require "util.jid".split;
34 function core_process_stanza(origin, stanza)
35 log("debug", "Received["..origin.type.."]: "..tostring(st.reply(st.reply(stanza))))
37 if not stanza.attr.xmlns then stanza.attr.xmlns = "jabber:client"; end -- FIXME Hack. This should be removed when we fix namespace handling.
38 -- TODO verify validity of stanza (as well as JID validity)
39 if stanza.name == "iq" and not(#stanza.tags == 1 and stanza.tags[1].attr.xmlns) then
40 if stanza.attr.type == "set" or stanza.attr.type == "get" then
42 elseif #stanza.tags > 1 and not(stanza.attr.type == "error" or stanza.attr.type == "result") then
47 if origin.type == "c2s" and not origin.full_jid
48 and not(stanza.name == "iq" and stanza.tags[1].name == "bind"
49 and stanza.tags[1].attr.xmlns == "urn:ietf:params:xml:ns:xmpp-bind") then
50 error("Client MUST bind resource after auth");
53 -- TODO also, stazas should be returned to their original state before the function ends
54 if origin.type == "c2s" then
55 stanza.attr.from = origin.full_jid;
57 local to = stanza.attr.to;
58 local node, host, resource = jid_split(to);
59 local to_bare = node and (node.."@"..host) or host; -- bare JID
60 local from = stanza.attr.from;
61 local from_node, from_host, from_resource = jid_split(from);
62 local from_bare = from_node and (from_node.."@"..from_host) or from_host; -- bare JID
64 if origin.type == "s2sin" then
65 if origin.from_host ~= from_host then -- remote server trying to impersonate some other server?
66 log("warn", "Received a stanza claiming to be from %s, over a conn authed for %s!", from, origin.from_host);
67 return; -- FIXME what should we do here? does this work with subdomains?
70 --[[if to and not(hosts[to]) and not(hosts[to_bare]) and (hosts[host] and hosts[host].type ~= "local") then -- not for us?
71 log("warn", "stanza recieved for a non-local server");
72 return; -- FIXME what should we do here?
75 -- FIXME do stanzas not of jabber:client get handled by components?
76 if origin.type == "s2sin" or origin.type == "c2s" then
78 core_handle_stanza(origin, stanza);
79 elseif hosts[to] and hosts[to].type == "local" then -- directed at a local server
80 core_handle_stanza(origin, stanza);
81 elseif stanza.attr.xmlns and stanza.attr.xmlns ~= "jabber:client" and stanza.attr.xmlns ~= "jabber:server" then
82 modules_handle_stanza(origin, stanza);
83 elseif hosts[to_bare] and hosts[to_bare].type == "component" then -- hack to allow components to handle node@server
84 component_handle_stanza(origin, stanza);
85 elseif hosts[to] and hosts[to].type == "component" then -- hack to allow components to handle node@server/resource and server/resource
86 component_handle_stanza(origin, stanza);
87 elseif hosts[host] and hosts[host].type == "component" then -- directed at a component
88 component_handle_stanza(origin, stanza);
89 elseif origin.type == "c2s" and stanza.name == "presence" and stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" then
90 handle_outbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare);
91 elseif stanza.name == "iq" and not resource then -- directed at bare JID
92 core_handle_stanza(origin, stanza);
94 core_route_stanza(origin, stanza);
97 core_handle_stanza(origin, stanza);
101 -- This function handles stanzas which are not routed any further,
102 -- that is, they are handled by this server
103 function core_handle_stanza(origin, stanza)
105 if modules_handle_stanza(origin, stanza) then return; end
106 if origin.type == "c2s" or origin.type == "c2s_unauthed" then
107 local session = origin;
109 if stanza.name == "presence" and origin.roster then
110 if stanza.attr.type == nil or stanza.attr.type == "unavailable" then
111 for jid in pairs(origin.roster) do -- broadcast to all interested contacts
112 local subscription = origin.roster[jid].subscription;
113 if subscription == "both" or subscription == "from" then
114 stanza.attr.to = jid;
115 core_route_stanza(origin, stanza);
118 local node, host = jid_split(stanza.attr.from);
119 for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast to all resources
120 if res ~= origin and res.full_jid then -- to resource. FIXME is res.full_jid the correct check? Maybe it should be res.presence
121 stanza.attr.to = res.full_jid;
122 core_route_stanza(origin, stanza);
125 if stanza.attr.type == nil and not origin.presence then -- initial presence
126 local probe = st.presence({from = origin.full_jid, type = "probe"});
127 for jid in pairs(origin.roster) do -- probe all contacts we are subscribed to
128 local subscription = origin.roster[jid].subscription;
129 if subscription == "both" or subscription == "to" then
131 core_route_stanza(origin, probe);
134 for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast from all available resources
135 if res ~= origin and res.presence then
136 res.presence.attr.to = origin.full_jid;
137 core_route_stanza(res, res.presence);
138 res.presence.attr.to = nil;
141 if origin.roster.pending then -- resend incoming subscription requests
142 for jid in pairs(origin.roster.pending) do
143 origin.send(st.presence({type="subscribe", from=jid})); -- TODO add to attribute? Use original?
146 local request = st.presence({type="subscribe", from=origin.username.."@"..origin.host});
147 for jid, item in pairs(origin.roster) do -- resend outgoing subscription requests
149 request.attr.to = jid;
150 core_route_stanza(origin, request);
153 for _, msg in ipairs(offlinemanager.load(node, host) or {}) do
154 origin.send(msg); -- FIXME do we need to modify to/from in any way?
156 offlinemanager.deleteAll(node, host);
159 if stanza.attr.type == "unavailable" then
160 origin.presence = nil;
162 origin.presence = stanza;
163 local priority = stanza:child_with_name("priority");
164 if priority and #priority > 0 then
165 priority = t_concat(priority);
166 if s_find(priority, "^[+-]?[0-9]+$") then
167 priority = tonumber(priority);
168 if priority < -128 then priority = -128 end
169 if priority > 127 then priority = 127 end
170 origin.priority = priority;
174 stanza.attr.to = nil; -- reset it
176 log("warn", "Unhandled c2s presence: %s", tostring(stanza));
177 origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); -- FIXME correct error?
180 log("warn", "Unhandled c2s stanza: %s", tostring(stanza));
181 origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); -- FIXME correct error?
182 end -- TODO handle other stanzas
184 log("warn", "Unhandled origin: %s", origin.type);
185 -- s2s stanzas can get here
186 (origin.sends2s or origin.send)(st.error_reply(stanza, "cancel", "service-unavailable")); -- FIXME correct error?
190 function send_presence_of_available_resources(user, host, jid, recipient_session)
191 local h = hosts[host];
193 if h and h.type == "local" then
194 local u = h.sessions[user];
196 for k, session in pairs(u.sessions) do
197 local pres = session.presence;
200 pres.attr.from = session.full_jid;
201 recipient_session.send(pres);
203 pres.attr.from = nil;
212 function handle_outbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare)
213 local node, host = jid_split(from_bare);
214 local st_from, st_to = stanza.attr.from, stanza.attr.to;
215 stanza.attr.from, stanza.attr.to = from_bare, to_bare;
216 if stanza.attr.type == "subscribe" then
217 log("debug", "outbound subscribe from "..from_bare.." for "..to_bare);
219 -- 2. roster push (subscription = none, ask = subscribe)
220 if rostermanager.set_contact_pending_out(node, host, to_bare) then
221 rostermanager.roster_push(node, host, to_bare);
222 end -- else file error
223 core_route_stanza(origin, stanza);
224 elseif stanza.attr.type == "unsubscribe" then
225 log("debug", "outbound unsubscribe from "..from_bare.." for "..to_bare);
227 -- 2. roster push (subscription = none or from)
228 if rostermanager.unsubscribe(node, host, to_bare) then
229 rostermanager.roster_push(node, host, to_bare); -- FIXME do roster push when roster has in fact not changed?
230 end -- else file error
231 core_route_stanza(origin, stanza);
232 elseif stanza.attr.type == "subscribed" then
233 log("debug", "outbound subscribed from "..from_bare.." for "..to_bare);
236 -- 3. send_presence_of_available_resources
237 if rostermanager.subscribed(node, host, to_bare) then
238 rostermanager.roster_push(node, host, to_bare);
239 core_route_stanza(origin, stanza);
240 send_presence_of_available_resources(node, host, to_bare, origin);
242 elseif stanza.attr.type == "unsubscribed" then
243 log("debug", "outbound unsubscribed from "..from_bare.." for "..to_bare);
245 -- 2. roster push (subscription = none or to)
246 if rostermanager.unsubscribed(node, host, to_bare) then
247 rostermanager.roster_push(node, host, to_bare);
248 core_route_stanza(origin, stanza);
251 stanza.attr.from, stanza.attr.to = st_from, st_to;
254 function handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare)
255 local node, host = jid_split(to_bare);
256 local st_from, st_to = stanza.attr.from, stanza.attr.to;
257 stanza.attr.from, stanza.attr.to = from_bare, to_bare;
258 if stanza.attr.type == "probe" then
259 log("debug", "inbound probe from "..from_bare.." for "..to_bare);
260 if rostermanager.is_contact_subscribed(node, host, from_bare) then
261 if 0 == send_presence_of_available_resources(node, host, from_bare, origin) then
262 -- TODO send last recieved unavailable presence (or we MAY do nothing, which is fine too)
265 core_route_stanza(origin, st.presence({from=to_bare, to=from_bare, type="unsubscribed"}));
267 elseif stanza.attr.type == "subscribe" then
268 log("debug", "inbound subscribe from "..from_bare.." for "..to_bare);
269 if rostermanager.is_contact_subscribed(node, host, from_bare) then
270 core_route_stanza(origin, st.presence({from=to_bare, to=from_bare, type="subscribed"})); -- already subscribed
272 if not rostermanager.is_contact_pending_in(node, host, from_bare) then
273 if rostermanager.set_contact_pending_in(node, host, from_bare) then
274 sessionmanager.send_to_available_resources(node, host, stanza);
275 end -- TODO else return error, unable to save
278 elseif stanza.attr.type == "unsubscribe" then
279 log("debug", "inbound unsubscribe from "..from_bare.." for "..to_bare);
280 if rostermanager.process_inbound_unsubscribe(node, host, from_bare) then
281 rostermanager.roster_push(node, host, from_bare);
283 elseif stanza.attr.type == "subscribed" then
284 log("debug", "inbound subscribed from "..from_bare.." for "..to_bare);
285 if rostermanager.process_inbound_subscription_approval(node, host, from_bare) then
286 rostermanager.roster_push(node, host, from_bare);
288 elseif stanza.attr.type == "unsubscribed" then
289 log("debug", "inbound unsubscribed from "..from_bare.." for "..to_bare);
290 if rostermanager.process_inbound_subscription_approval(node, host, from_bare) then
291 rostermanager.roster_push(node, host, from_bare);
293 end -- discard any other type
294 stanza.attr.from, stanza.attr.to = st_from, st_to;
297 function core_route_stanza(origin, stanza)
302 local to = stanza.attr.to;
303 local node, host, resource = jid_split(to);
304 local to_bare = node and (node.."@"..host) or host; -- bare JID
305 local from = stanza.attr.from;
306 local from_node, from_host, from_resource = jid_split(from);
307 local from_bare = from_node and (from_node.."@"..from_host) or from_host; -- bare JID
309 if stanza.name == "presence" and (stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable") then resource = nil; end
311 local host_session = hosts[host]
312 if host_session and host_session.type == "local" then
314 local user = host_session.sessions[node];
316 local res = user.sessions[resource];
318 -- if we get here, resource was not specified or was unavailable
319 if stanza.name == "presence" then
320 if stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" then
321 handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare);
322 else -- sender is available or unavailable
323 for _, session in pairs(user.sessions) do -- presence broadcast to all user resources.
324 if session.full_jid then -- FIXME should this be just for available resources? Do we need to check subscription?
325 stanza.attr.to = session.full_jid; -- reset at the end of function
326 session.send(stanza);
330 elseif stanza.name == "message" then -- select a resource to recieve message
332 local recipients = {};
333 for _, session in pairs(user.sessions) do -- find resource with greatest priority
334 local p = session.priority;
337 recipients = {session};
338 elseif p == priority then
339 t_insert(recipients, session);
343 for _, session in pairs(recipients) do
344 session.send(stanza);
348 offlinemanager.store(node, host, stanza);
349 -- TODO deal with storage errors
352 -- TODO send IQ error
355 -- User + resource is online...
356 stanza.attr.to = res.full_jid; -- reset at the end of function
357 res.send(stanza); -- Yay \o/
361 if user_exists(node, host) then
362 if stanza.name == "presence" then
363 if stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" then
364 handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare);
366 -- TODO send unavailable presence or unsubscribed
368 elseif stanza.name == "message" then
369 if stanza.attr.type == "chat" or stanza.attr.type == "normal" or not stanza.attr.type then
370 offlinemanager.store(node, host, stanza);
371 -- FIXME don't store messages with only chat state notifications
373 -- TODO allow configuration of offline storage
374 -- TODO send error if not storing offline
375 elseif stanza.name == "iq" then
376 -- TODO send IQ error
378 else -- user does not exist
379 -- TODO we would get here for nodeless JIDs too. Do something fun maybe? Echo service? Let plugins use xmpp:server/resource addresses?
380 if stanza.name == "presence" then
381 if stanza.attr.type == "probe" then
382 origin.send(st.presence({from = to_bare, to = from_bare, type = "unsubscribed"}));
386 origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
390 elseif origin.type == "c2s" then
392 local xmlns = stanza.attr.xmlns;
393 --stanza.attr.xmlns = "jabber:server";
394 stanza.attr.xmlns = nil;
395 log("debug", "sending s2s stanza: %s", tostring(stanza));
396 send_s2s(origin.host, host, stanza); -- TODO handle remote routing errors
397 stanza.attr.xmlns = xmlns; -- reset
398 elseif origin.type == "component" or origin.type == "local" then
399 -- Route via s2s for components and modules
400 log("debug", "Routing outgoing stanza for %s to %s", origin.host, host);
401 for k,v in pairs(origin) do print("origin:", tostring(k), tostring(v)); end
402 print(tostring(host), tostring(from_host))
403 send_s2s(origin.host, host, stanza);
405 log("warn", "received stanza from unhandled connection type: %s", origin.type);
407 stanza.attr.to = to; -- reset
410 function handle_stanza_toremote(stanza)
411 log("error", "Stanza bound for remote host, but s2s is not implemented");