Tue, 14 Oct 2008 07:20:29 +0500
Fixed: Typos caused by lack of sleep.
Learned: Lua variable assignments are not expressions.
30 | 1 | |
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) | |
5 | ||
6 | require "core.servermanager" | |
7 | ||
8 | local log = require "util.logger".init("stanzarouter") | |
9 | ||
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10 | local st = require "util.stanza"; |
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11 | local send = require "core.sessionmanager".send_to_session; |
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12 | |
30 | 13 | require "util.jid" |
14 | local jid_split = jid.split; | |
15 | ||
16 | function core_process_stanza(origin, stanza) | |
66 | 17 | log("debug", "Received: "..tostring(stanza)) |
73 | 18 | -- TODO verify validity of stanza (as well as JID validity) |
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19 | if stanza.name == "iq" and not(#stanza.tags == 1 and stanza.tags[1].attr.xmlns) then |
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20 | error("Invalid IQ"); |
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21 | end |
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22 | |
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23 | if origin.type == "c2s" and not origin.full_jid |
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24 | and not(stanza.name == "iq" and stanza.tags[1].name == "bind" |
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25 | and stanza.tags[1].attr.xmlns == "urn:ietf:params:xml:ns:xmpp-bind") then |
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26 | error("Client MUST bind resource after auth"); |
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27 | end |
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28 | |
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29 | |
30 | 30 | local to = stanza.attr.to; |
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31 | stanza.attr.from = origin.full_jid -- quick fix to prevent impersonation |
30 | 32 | |
33 | if not to or (hosts[to] and hosts[to].type == "local") then | |
34 | core_handle_stanza(origin, stanza); | |
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35 | elseif to and stanza.name == "iq" and not select(3, jid_split(to)) then |
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36 | core_handle_stanza(origin, stanza); |
30 | 37 | elseif origin.type == "c2s" then |
38 | core_route_stanza(origin, stanza); | |
39 | end | |
40 | end | |
41 | ||
42 | function core_handle_stanza(origin, stanza) | |
43 | -- Handlers | |
44 | if origin.type == "c2s" or origin.type == "c2s_unauthed" then | |
45 | local session = origin; | |
46 | stanza.attr.from = session.full_jid; | |
47 | ||
48 | log("debug", "Routing stanza"); | |
49 | -- Stanza has no to attribute | |
50 | --local to_node, to_host, to_resource = jid_split(stanza.attr.to); | |
51 | --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 | |
52 | ||
53 | -- Stanza is to this server, or a user on this server | |
54 | log("debug", "Routing stanza to local"); | |
55 | handle_stanza(session, stanza); | |
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56 | end |
30 | 57 | end |
58 | ||
59 | function core_route_stanza(origin, stanza) | |
60 | -- Hooks | |
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61 | --- ...later |
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62 | |
30 | 63 | -- Deliver |
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64 | local node, host, resource = jid_split(stanza.attr.to); |
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65 | local host_session = hosts[host] |
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66 | if host_session and host_session.type == "local" then |
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67 | -- Local host |
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68 | local user = host_session.sessions[node]; |
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69 | if user then |
72 | 70 | local res = user.sessions[resource]; |
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71 | -- TODO do something about presence broadcast |
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72 | if not res then |
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73 | -- if we get here, resource was not specified or was unavailable |
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74 | for k in pairs(user.sessions) do |
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75 | res = user.sessions[k]; |
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76 | break; |
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77 | end |
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78 | -- TODO find resource with greatest priority |
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79 | end |
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80 | stanza.attr.to = res.full_jid; |
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81 | send(res, stanza); -- Yay \o/ |
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82 | else |
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83 | -- user not found |
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84 | send(origin, st.error_reply(stanza, "cancel", "service-unavailable")); |
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85 | end |
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86 | else |
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87 | -- Remote host |
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88 | if host_session then |
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89 | -- Send to session |
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90 | else |
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91 | -- Need to establish the connection |
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92 | end |
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93 | end |
30 | 94 | end |
95 | ||
96 | function handle_stanza_nodest(stanza) | |
97 | if stanza.name == "iq" then | |
98 | handle_stanza_iq_no_to(session, stanza); | |
99 | elseif stanza.name == "presence" then | |
100 | -- Broadcast to this user's contacts | |
101 | handle_stanza_presence_broadcast(session, stanza); | |
102 | -- also, if it is initial presence, send out presence probes | |
103 | if not session.last_presence then | |
104 | handle_stanza_presence_probe_broadcast(session, stanza); | |
105 | end | |
106 | session.last_presence = stanza; | |
107 | elseif stanza.name == "message" then | |
108 | -- Treat as if message was sent to bare JID of the sender | |
109 | handle_stanza_to_local_user(stanza); | |
110 | end | |
111 | end | |
112 | ||
113 | function handle_stanza_tolocal(stanza) | |
114 | local node, host, resource = jid.split(stanza.attr.to); | |
115 | if host and hosts[host] and hosts[host].type == "local" then | |
116 | -- Is a local host, handle internally | |
117 | if node then | |
118 | -- Is a local user, send to their session | |
119 | log("debug", "Routing stanza to %s@%s", node, host); | |
120 | if not session.username then return; end --FIXME: Correct response when trying to use unauthed stream is what? | |
121 | handle_stanza_to_local_user(stanza); | |
122 | else | |
123 | -- Is sent to this server, let's handle it... | |
124 | log("debug", "Routing stanza to %s", host); | |
125 | handle_stanza_to_server(stanza, session); | |
126 | end | |
127 | end | |
128 | end | |
129 | ||
130 | function handle_stanza_toremote(stanza) | |
131 | log("error", "Stanza bound for remote host, but s2s is not implemented"); | |
132 | end | |
133 | ||
134 | ||
135 | --[[ | |
136 | local function route_c2s_stanza(session, stanza) | |
137 | stanza.attr.from = session.full_jid; | |
138 | if not stanza.attr.to and session.username then | |
139 | -- Has no 'to' attribute, handle internally | |
140 | if stanza.name == "iq" then | |
141 | handle_stanza_iq_no_to(session, stanza); | |
142 | elseif stanza.name == "presence" then | |
143 | -- Broadcast to this user's contacts | |
144 | handle_stanza_presence_broadcast(session, stanza); | |
145 | -- also, if it is initial presence, send out presence probes | |
146 | if not session.last_presence then | |
147 | handle_stanza_presence_probe_broadcast(session, stanza); | |
148 | end | |
149 | session.last_presence = stanza; | |
150 | elseif stanza.name == "message" then | |
151 | -- Treat as if message was sent to bare JID of the sender | |
152 | handle_stanza_to_local_user(stanza); | |
153 | end | |
154 | end | |
155 | local node, host, resource = jid.split(stanza.attr.to); | |
156 | if host and hosts[host] and hosts[host].type == "local" then | |
157 | -- Is a local host, handle internally | |
158 | if node then | |
159 | -- Is a local user, send to their session | |
160 | if not session.username then return; end --FIXME: Correct response when trying to use unauthed stream is what? | |
161 | handle_stanza_to_local_user(stanza); | |
162 | else | |
163 | -- Is sent to this server, let's handle it... | |
164 | handle_stanza_to_server(stanza, session); | |
165 | end | |
166 | else | |
167 | -- Is not for us or a local user, route accordingly | |
168 | route_s2s_stanza(stanza); | |
169 | end | |
170 | end | |
171 | ||
172 | function handle_stanza_no_to(session, stanza) | |
173 | if not stanza.attr.id then log("warn", "<iq> without id attribute is invalid"); end | |
174 | local xmlns = (stanza.tags[1].attr and stanza.tags[1].attr.xmlns); | |
175 | if stanza.attr.type == "get" or stanza.attr.type == "set" then | |
176 | if iq_handlers[xmlns] then | |
177 | if iq_handlers[xmlns](stanza) then return; end; -- If handler returns true, it handled it | |
178 | end | |
179 | -- Oh, handler didn't handle it. Need to send service-unavailable now. | |
180 | log("warn", "Unhandled namespace: "..xmlns); | |
181 | session:send(format("<iq type='error' id='%s'><error type='cancel'><service-unavailable/></error></iq>", stanza.attr.id)); | |
182 | return; -- All done! | |
183 | end | |
184 | end | |
185 | ||
186 | function handle_stanza_to_local_user(stanza) | |
187 | if stanza.name == "message" then | |
188 | handle_stanza_message_to_local_user(stanza); | |
189 | elseif stanza.name == "presence" then | |
190 | handle_stanza_presence_to_local_user(stanza); | |
191 | elseif stanza.name == "iq" then | |
192 | handle_stanza_iq_to_local_user(stanza); | |
193 | end | |
194 | end | |
195 | ||
196 | function handle_stanza_message_to_local_user(stanza) | |
197 | local node, host, resource = stanza.to.node, stanza.to.host, stanza.to.resource; | |
198 | local destuser = hosts[host].sessions[node]; | |
199 | if destuser then | |
200 | if resource and destuser[resource] then | |
201 | destuser[resource]:send(stanza); | |
202 | else | |
203 | -- Bare JID, or resource offline | |
204 | local best_session; | |
205 | for resource, session in pairs(destuser.sessions) do | |
206 | if not best_session then best_session = session; | |
207 | elseif session.priority >= best_session.priority and session.priority >= 0 then | |
208 | best_session = session; | |
209 | end | |
210 | end | |
211 | if not best_session then | |
212 | offlinemessage.new(node, host, stanza); | |
213 | else | |
214 | print("resource '"..resource.."' was not online, have chosen to send to '"..best_session.username.."@"..best_session.host.."/"..best_session.resource.."'"); | |
215 | destuser[best_session]:send(stanza); | |
216 | end | |
217 | end | |
218 | else | |
219 | -- User is offline | |
220 | offlinemessage.new(node, host, stanza); | |
221 | end | |
222 | end | |
223 | ||
224 | function handle_stanza_presence_to_local_user(stanza) | |
225 | local node, host, resource = stanza.to.node, stanza.to.host, stanza.to.resource; | |
226 | local destuser = hosts[host].sessions[node]; | |
227 | if destuser then | |
228 | if resource then | |
229 | if destuser[resource] then | |
230 | destuser[resource]:send(stanza); | |
231 | else | |
232 | return; | |
233 | end | |
234 | else | |
235 | -- Broadcast to all user's resources | |
236 | for resource, session in pairs(destuser.sessions) do | |
237 | session:send(stanza); | |
238 | end | |
239 | end | |
240 | end | |
241 | end | |
242 | ||
243 | function handle_stanza_iq_to_local_user(stanza) | |
244 | ||
245 | end | |
246 | ||
247 | function foo() | |
248 | local node, host, resource = stanza.to.node, stanza.to.host, stanza.to.resource; | |
249 | local destuser = hosts[host].sessions[node]; | |
250 | if destuser and destuser.sessions then | |
251 | -- User online | |
252 | if resource and destuser.sessions[resource] then | |
253 | stanza.to:send(stanza); | |
254 | else | |
255 | --User is online, but specified resource isn't (or no resource specified) | |
256 | local best_session; | |
257 | for resource, session in pairs(destuser.sessions) do | |
258 | if not best_session then best_session = session; | |
259 | elseif session.priority >= best_session.priority and session.priority >= 0 then | |
260 | best_session = session; | |
261 | end | |
262 | end | |
263 | if not best_session then | |
264 | offlinemessage.new(node, host, stanza); | |
265 | else | |
266 | print("resource '"..resource.."' was not online, have chosen to send to '"..best_session.username.."@"..best_session.host.."/"..best_session.resource.."'"); | |
267 | resource = best_session.resource; | |
268 | end | |
269 | end | |
270 | if destuser.sessions[resource] == session then | |
271 | log("warn", "core", "Attempt to send stanza to self, dropping..."); | |
272 | else | |
273 | print("...sending...", tostring(stanza)); | |
274 | --destuser.sessions[resource].conn.write(tostring(data)); | |
275 | print(" to conn ", destuser.sessions[resource].conn); | |
276 | destuser.sessions[resource].conn.write(tostring(stanza)); | |
277 | print("...sent") | |
278 | end | |
279 | elseif stanza.name == "message" then | |
280 | print(" ...will be stored offline"); | |
281 | offlinemessage.new(node, host, stanza); | |
282 | elseif stanza.name == "iq" then | |
283 | print(" ...is an iq"); | |
284 | stanza.from:send(st.reply(stanza) | |
285 | :tag("error", { type = "cancel" }) | |
286 | :tag("service-unavailable", { xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas" })); | |
287 | end | |
288 | end | |
289 | ||
290 | -- Broadcast a presence stanza to all of a user's contacts | |
291 | function handle_stanza_presence_broadcast(session, stanza) | |
292 | if session.roster then | |
293 | local initial_presence = not session.last_presence; | |
294 | session.last_presence = stanza; | |
295 | ||
296 | -- Broadcast presence and probes | |
297 | local broadcast = st.presence({ from = session.full_jid, type = stanza.attr.type }); | |
298 | ||
299 | for child in stanza:childtags() do | |
300 | broadcast:add_child(child); | |
301 | end | |
302 | for contact_jid in pairs(session.roster) do | |
303 | broadcast.attr.to = contact_jid; | |
304 | send_to(contact_jid, broadcast); | |
305 | if initial_presence then | |
306 | local node, host = jid.split(contact_jid); | |
307 | if hosts[host] and hosts[host].type == "local" then | |
308 | local contact = hosts[host].sessions[node] | |
309 | if contact then | |
310 | local pres = st.presence { to = session.full_jid }; | |
311 | for resource, contact_session in pairs(contact.sessions) do | |
312 | if contact_session.last_presence then | |
313 | pres.tags = contact_session.last_presence.tags; | |
314 | pres.attr.from = contact_session.full_jid; | |
315 | send(pres); | |
316 | end | |
317 | end | |
318 | end | |
319 | --FIXME: Do we send unavailable if they are offline? | |
320 | else | |
321 | probe.attr.to = contact; | |
322 | send_to(contact, probe); | |
323 | end | |
324 | end | |
325 | end | |
326 | ||
327 | -- Probe for our contacts' presence | |
328 | end | |
329 | end | |
330 | ||
331 | -- Broadcast presence probes to all of a user's contacts | |
332 | function handle_stanza_presence_probe_broadcast(session, stanza) | |
333 | end | |
334 | ||
335 | -- | |
336 | function handle_stanza_to_server(stanza) | |
337 | end | |
338 | ||
339 | function handle_stanza_iq_no_to(session, stanza) | |
340 | end | |
341 | ]] |