aboutsummaryrefslogtreecommitdiffstats
path: root/core/stanza_router.lua
blob: 02e0871f953fd6f9e548a1885cfe1451ec7a5e46 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336

-- The code in this file should be self-explanatory, though the logic is horrible
-- for more info on that, see doc/stanza_routing.txt, which attempts to condense
-- the rules from the RFCs (mainly 3921)

require "core.servermanager"

local log = require "util.logger".init("stanzarouter")

local st = require "util.stanza";
local send = require "core.sessionmanager".send_to_session;

require "util.jid"
local jid_split = jid.split;

function core_process_stanza(origin, stanza)
	log("debug", "Received: "..tostring(stanza))
	-- TODO verify validity of stanza (as well as JID validity)

	if origin.type == "c2s" and not origin.full_jid
		and not(stanza.name == "iq" and stanza.tags[1] and stanza.tags[1].name == "bind"
				and stanza.tags[1].attr.xmlns == "urn:ietf:params:xml:ns:xmpp-bind") then
		error("Client MUST bind resource after auth");
	end

	
	local to = stanza.attr.to;
	stanza.attr.from = origin.full_jid -- quick fix to prevent impersonation
	
	if not to or (hosts[to] and hosts[to].type == "local") then
		core_handle_stanza(origin, stanza);
	elseif origin.type == "c2s" then
		core_route_stanza(origin, stanza);
	end
end

function core_handle_stanza(origin, stanza)
	-- Handlers
	if origin.type == "c2s" or origin.type == "c2s_unauthed" then
		local session = origin;
		stanza.attr.from = session.full_jid;
		
		log("debug", "Routing stanza");
		-- Stanza has no to attribute
		--local to_node, to_host, to_resource = jid_split(stanza.attr.to);
		--if not to_host then error("Invalid destination JID: "..string.format("{ %q, %q, %q } == %q", to_node or "", to_host or "", to_resource or "", stanza.attr.to or "nil")); end
		
		-- Stanza is to this server, or a user on this server
		log("debug", "Routing stanza to local");
		handle_stanza(session, stanza);
	end
end

function core_route_stanza(origin, stanza)
	-- Hooks
	--- ...later
	
	-- Deliver
	local node, host, resource = jid_split(stanza.attr.to);
	local host_session = hosts[host]
	if host_session and host_session.type == "local" then
		-- Local host
		local user = host_session.sessions[node];
		if user then
			local res = user.sessions[resource];
			-- TODO do something about presence broadcast
			if not res then
				-- if we get here, resource was not specified or was unavailable
				for k in pairs(user.sessions) do
					res = user.sessions[k];
					break;
				end
				-- TODO find resource with greatest priority
			end
			stanza.attr.to = res.full_jid;
			send(res, stanza); -- Yay \o/
		else
			-- user not found
			send(origin, st.error_reply(stanza, "cancel", "service-unavailable"));
		end
	else
		-- Remote host
		if host_session then
			-- Send to session
		else
			-- Need to establish the connection
		end
	end
end

function handle_stanza_nodest(stanza)
	if stanza.name == "iq" then
		handle_stanza_iq_no_to(session, stanza);
	elseif stanza.name == "presence" then
		-- Broadcast to this user's contacts
		handle_stanza_presence_broadcast(session, stanza);
		-- also, if it is initial presence, send out presence probes
		if not session.last_presence then
			handle_stanza_presence_probe_broadcast(session, stanza);
		end
		session.last_presence = stanza;
	elseif stanza.name == "message" then
		-- Treat as if message was sent to bare JID of the sender
		handle_stanza_to_local_user(stanza);
	end
end

function handle_stanza_tolocal(stanza)
	local node, host, resource = jid.split(stanza.attr.to);
	if host and hosts[host] and hosts[host].type == "local" then
			-- Is a local host, handle internally
			if node then
				-- Is a local user, send to their session
				log("debug", "Routing stanza to %s@%s", node, host);
				if not session.username then return; end --FIXME: Correct response when trying to use unauthed stream is what?
				handle_stanza_to_local_user(stanza);
			else
				-- Is sent to this server, let's handle it...
				log("debug", "Routing stanza to %s", host);
				handle_stanza_to_server(stanza, session);
			end
	end
end

function handle_stanza_toremote(stanza)
	log("error", "Stanza bound for remote host, but s2s is not implemented");
end


--[[
local function route_c2s_stanza(session, stanza)
	stanza.attr.from = session.full_jid;
	if not stanza.attr.to and session.username then
		-- Has no 'to' attribute, handle internally
		if stanza.name == "iq" then
			handle_stanza_iq_no_to(session, stanza);
		elseif stanza.name == "presence" then
			-- Broadcast to this user's contacts
			handle_stanza_presence_broadcast(session, stanza);
			-- also, if it is initial presence, send out presence probes
			if not session.last_presence then
				handle_stanza_presence_probe_broadcast(session, stanza);
			end
			session.last_presence = stanza;
		elseif stanza.name == "message" then
			-- Treat as if message was sent to bare JID of the sender
			handle_stanza_to_local_user(stanza);
		end
	end
	local node, host, resource = jid.split(stanza.attr.to);
	if host and hosts[host] and hosts[host].type == "local" then
			-- Is a local host, handle internally
			if node then
				-- Is a local user, send to their session
				if not session.username then return; end --FIXME: Correct response when trying to use unauthed stream is what?
				handle_stanza_to_local_user(stanza);
			else
				-- Is sent to this server, let's handle it...
				handle_stanza_to_server(stanza, session);
			end
	else
		-- Is not for us or a local user, route accordingly
		route_s2s_stanza(stanza);
	end
end

function handle_stanza_no_to(session, stanza)
	if not stanza.attr.id then log("warn", "<iq> without id attribute is invalid"); end
	local xmlns = (stanza.tags[1].attr and stanza.tags[1].attr.xmlns);
	if stanza.attr.type == "get" or stanza.attr.type == "set" then
		if iq_handlers[xmlns] then
			if iq_handlers[xmlns](stanza) then return; end; -- If handler returns true, it handled it
		end
		-- Oh, handler didn't handle it. Need to send service-unavailable now.
		log("warn", "Unhandled namespace: "..xmlns);
		session:send(format("<iq type='error' id='%s'><error type='cancel'><service-unavailable/></error></iq>", stanza.attr.id));
		return; -- All done!
	end
end

function handle_stanza_to_local_user(stanza)
	if stanza.name == "message" then
		handle_stanza_message_to_local_user(stanza);
	elseif stanza.name == "presence" then
		handle_stanza_presence_to_local_user(stanza);
	elseif stanza.name == "iq" then
		handle_stanza_iq_to_local_user(stanza);
	end
end

function handle_stanza_message_to_local_user(stanza)
	local node, host, resource = stanza.to.node, stanza.to.host, stanza.to.resource;
	local destuser = hosts[host].sessions[node];
	if destuser then
		if resource and destuser[resource] then
			destuser[resource]:send(stanza);
		else
			-- Bare JID, or resource offline
			local best_session;
			for resource, session in pairs(destuser.sessions) do
				if not best_session then best_session = session;
				elseif session.priority >= best_session.priority and session.priority >= 0 then
					best_session = session;
				end
			end
			if not best_session then
				offlinemessage.new(node, host, stanza);
			else
				print("resource '"..resource.."' was not online, have chosen to send to '"..best_session.username.."@"..best_session.host.."/"..best_session.resource.."'");
				destuser[best_session]:send(stanza);
			end
		end
	else
		-- User is offline
		offlinemessage.new(node, host, stanza);
	end
end

function handle_stanza_presence_to_local_user(stanza)
	local node, host, resource = stanza.to.node, stanza.to.host, stanza.to.resource;
	local destuser = hosts[host].sessions[node];
	if destuser then
		if resource then
			if destuser[resource] then
				destuser[resource]:send(stanza);
			else
				return;
			end
		else
			-- Broadcast to all user's resources
			for resource, session in pairs(destuser.sessions) do
				session:send(stanza);
			end
		end
	end
end

function handle_stanza_iq_to_local_user(stanza)

end

function foo()
		local node, host, resource = stanza.to.node, stanza.to.host, stanza.to.resource;
		local destuser = hosts[host].sessions[node];
		if destuser and destuser.sessions then
			-- User online
			if resource and destuser.sessions[resource] then
				stanza.to:send(stanza);
			else
				--User is online, but specified resource isn't (or no resource specified)
				local best_session;
				for resource, session in pairs(destuser.sessions) do
					if not best_session then best_session = session;
					elseif session.priority >= best_session.priority and session.priority >= 0 then
						best_session = session;
					end
				end
				if not best_session then
					offlinemessage.new(node, host, stanza);
				else
					print("resource '"..resource.."' was not online, have chosen to send to '"..best_session.username.."@"..best_session.host.."/"..best_session.resource.."'");
					resource = best_session.resource;
				end
			end
			if destuser.sessions[resource] == session then
				log("warn", "core", "Attempt to send stanza to self, dropping...");
			else
				print("...sending...", tostring(stanza));
				--destuser.sessions[resource].conn.write(tostring(data));
				print("   to conn ", destuser.sessions[resource].conn);
				destuser.sessions[resource].conn.write(tostring(stanza));
				print("...sent")
			end
		elseif stanza.name == "message" then
			print("   ...will be stored offline");
			offlinemessage.new(node, host, stanza);
		elseif stanza.name == "iq" then
			print("   ...is an iq");
			stanza.from:send(st.reply(stanza)
				:tag("error", { type = "cancel" })
					:tag("service-unavailable", { xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas" }));
		end
end

-- Broadcast a presence stanza to all of a user's contacts
function handle_stanza_presence_broadcast(session, stanza)
	if session.roster then
		local initial_presence = not session.last_presence;
		session.last_presence = stanza;
		
		-- Broadcast presence and probes
		local broadcast = st.presence({ from = session.full_jid, type = stanza.attr.type });

		for child in stanza:childtags() do
			broadcast:add_child(child);
		end
		for contact_jid in pairs(session.roster) do
			broadcast.attr.to = contact_jid;
			send_to(contact_jid, broadcast);
			if initial_presence then
				local node, host = jid.split(contact_jid);
				if hosts[host] and hosts[host].type == "local" then
					local contact = hosts[host].sessions[node]
					if contact then
						local pres = st.presence { to = session.full_jid };
						for resource, contact_session in pairs(contact.sessions) do
							if contact_session.last_presence then
								pres.tags = contact_session.last_presence.tags;
								pres.attr.from = contact_session.full_jid;
								send(pres);
							end
						end
					end
					--FIXME: Do we send unavailable if they are offline?
				else
					probe.attr.to = contact;
					send_to(contact, probe);
				end
			end
		end
		
		-- Probe for our contacts' presence
	end
end

-- Broadcast presence probes to all of a user's contacts
function handle_stanza_presence_probe_broadcast(session, stanza)
end

-- 
function handle_stanza_to_server(stanza)
end

function handle_stanza_iq_no_to(session, stanza)
end
]]