Tue, 14 Oct 2008 09:56:14 +0500
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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 | |
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13 | local jid_split = require "util.jid".split; |
30 | 14 | |
15 | function core_process_stanza(origin, stanza) | |
66 | 16 | log("debug", "Received: "..tostring(stanza)) |
73 | 17 | -- TODO verify validity of stanza (as well as JID validity) |
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18 | if stanza.name == "iq" and not(#stanza.tags == 1 and stanza.tags[1].attr.xmlns) then |
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19 | error("Invalid IQ"); |
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20 | end |
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21 | |
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22 | if origin.type == "c2s" and not origin.full_jid |
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23 | and not(stanza.name == "iq" and stanza.tags[1].name == "bind" |
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24 | and stanza.tags[1].attr.xmlns == "urn:ietf:params:xml:ns:xmpp-bind") then |
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25 | error("Client MUST bind resource after auth"); |
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26 | end |
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27 | |
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28 | |
30 | 29 | local to = stanza.attr.to; |
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30 | stanza.attr.from = origin.full_jid -- quick fix to prevent impersonation |
30 | 31 | |
32 | if not to or (hosts[to] and hosts[to].type == "local") then | |
33 | core_handle_stanza(origin, stanza); | |
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34 | elseif to and stanza.name == "iq" and not select(3, jid_split(to)) then |
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35 | core_handle_stanza(origin, stanza); |
30 | 36 | elseif origin.type == "c2s" then |
37 | core_route_stanza(origin, stanza); | |
38 | end | |
39 | end | |
40 | ||
41 | function core_handle_stanza(origin, stanza) | |
42 | -- Handlers | |
43 | if origin.type == "c2s" or origin.type == "c2s_unauthed" then | |
44 | local session = origin; | |
45 | stanza.attr.from = session.full_jid; | |
46 | ||
47 | log("debug", "Routing stanza"); | |
48 | -- Stanza has no to attribute | |
49 | --local to_node, to_host, to_resource = jid_split(stanza.attr.to); | |
50 | --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 | |
51 | ||
52 | -- Stanza is to this server, or a user on this server | |
53 | log("debug", "Routing stanza to local"); | |
54 | handle_stanza(session, stanza); | |
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55 | end |
30 | 56 | end |
57 | ||
58 | function core_route_stanza(origin, stanza) | |
59 | -- Hooks | |
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60 | --- ...later |
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61 | |
30 | 62 | -- Deliver |
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63 | local node, host, resource = jid_split(stanza.attr.to); |
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64 | local host_session = hosts[host] |
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65 | if host_session and host_session.type == "local" then |
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66 | -- Local host |
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67 | local user = host_session.sessions[node]; |
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68 | if user then |
72 | 69 | local res = user.sessions[resource]; |
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70 | -- TODO do something about presence broadcast |
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71 | if not res then |
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72 | -- if we get here, resource was not specified or was unavailable |
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73 | for k in pairs(user.sessions) do |
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74 | res = user.sessions[k]; |
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75 | break; |
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76 | end |
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77 | -- TODO find resource with greatest priority |
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78 | end |
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79 | stanza.attr.to = res.full_jid; |
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80 | send(res, stanza); -- Yay \o/ |
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81 | else |
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82 | -- user not found |
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83 | send(origin, st.error_reply(stanza, "cancel", "service-unavailable")); |
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84 | end |
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85 | else |
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86 | -- Remote host |
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87 | if host_session then |
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88 | -- Send to session |
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89 | else |
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90 | -- Need to establish the connection |
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91 | end |
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92 | end |
30 | 93 | end |
94 | ||
95 | function handle_stanza_nodest(stanza) | |
96 | if stanza.name == "iq" then | |
97 | handle_stanza_iq_no_to(session, stanza); | |
98 | elseif stanza.name == "presence" then | |
99 | -- Broadcast to this user's contacts | |
100 | handle_stanza_presence_broadcast(session, stanza); | |
101 | -- also, if it is initial presence, send out presence probes | |
102 | if not session.last_presence then | |
103 | handle_stanza_presence_probe_broadcast(session, stanza); | |
104 | end | |
105 | session.last_presence = stanza; | |
106 | elseif stanza.name == "message" then | |
107 | -- Treat as if message was sent to bare JID of the sender | |
108 | handle_stanza_to_local_user(stanza); | |
109 | end | |
110 | end | |
111 | ||
112 | function handle_stanza_tolocal(stanza) | |
113 | local node, host, resource = jid.split(stanza.attr.to); | |
114 | if host and hosts[host] and hosts[host].type == "local" then | |
115 | -- Is a local host, handle internally | |
116 | if node then | |
117 | -- Is a local user, send to their session | |
118 | log("debug", "Routing stanza to %s@%s", node, host); | |
119 | if not session.username then return; end --FIXME: Correct response when trying to use unauthed stream is what? | |
120 | handle_stanza_to_local_user(stanza); | |
121 | else | |
122 | -- Is sent to this server, let's handle it... | |
123 | log("debug", "Routing stanza to %s", host); | |
124 | handle_stanza_to_server(stanza, session); | |
125 | end | |
126 | end | |
127 | end | |
128 | ||
129 | function handle_stanza_toremote(stanza) | |
130 | log("error", "Stanza bound for remote host, but s2s is not implemented"); | |
131 | end | |
132 | ||
133 | ||
134 | --[[ | |
135 | local function route_c2s_stanza(session, stanza) | |
136 | stanza.attr.from = session.full_jid; | |
137 | if not stanza.attr.to and session.username then | |
138 | -- Has no 'to' attribute, handle internally | |
139 | if stanza.name == "iq" then | |
140 | handle_stanza_iq_no_to(session, stanza); | |
141 | elseif stanza.name == "presence" then | |
142 | -- Broadcast to this user's contacts | |
143 | handle_stanza_presence_broadcast(session, stanza); | |
144 | -- also, if it is initial presence, send out presence probes | |
145 | if not session.last_presence then | |
146 | handle_stanza_presence_probe_broadcast(session, stanza); | |
147 | end | |
148 | session.last_presence = stanza; | |
149 | elseif stanza.name == "message" then | |
150 | -- Treat as if message was sent to bare JID of the sender | |
151 | handle_stanza_to_local_user(stanza); | |
152 | end | |
153 | end | |
154 | local node, host, resource = jid.split(stanza.attr.to); | |
155 | if host and hosts[host] and hosts[host].type == "local" then | |
156 | -- Is a local host, handle internally | |
157 | if node then | |
158 | -- Is a local user, send to their session | |
159 | if not session.username then return; end --FIXME: Correct response when trying to use unauthed stream is what? | |
160 | handle_stanza_to_local_user(stanza); | |
161 | else | |
162 | -- Is sent to this server, let's handle it... | |
163 | handle_stanza_to_server(stanza, session); | |
164 | end | |
165 | else | |
166 | -- Is not for us or a local user, route accordingly | |
167 | route_s2s_stanza(stanza); | |
168 | end | |
169 | end | |
170 | ||
171 | function handle_stanza_no_to(session, stanza) | |
172 | if not stanza.attr.id then log("warn", "<iq> without id attribute is invalid"); end | |
173 | local xmlns = (stanza.tags[1].attr and stanza.tags[1].attr.xmlns); | |
174 | if stanza.attr.type == "get" or stanza.attr.type == "set" then | |
175 | if iq_handlers[xmlns] then | |
176 | if iq_handlers[xmlns](stanza) then return; end; -- If handler returns true, it handled it | |
177 | end | |
178 | -- Oh, handler didn't handle it. Need to send service-unavailable now. | |
179 | log("warn", "Unhandled namespace: "..xmlns); | |
180 | session:send(format("<iq type='error' id='%s'><error type='cancel'><service-unavailable/></error></iq>", stanza.attr.id)); | |
181 | return; -- All done! | |
182 | end | |
183 | end | |
184 | ||
185 | function handle_stanza_to_local_user(stanza) | |
186 | if stanza.name == "message" then | |
187 | handle_stanza_message_to_local_user(stanza); | |
188 | elseif stanza.name == "presence" then | |
189 | handle_stanza_presence_to_local_user(stanza); | |
190 | elseif stanza.name == "iq" then | |
191 | handle_stanza_iq_to_local_user(stanza); | |
192 | end | |
193 | end | |
194 | ||
195 | function handle_stanza_message_to_local_user(stanza) | |
196 | local node, host, resource = stanza.to.node, stanza.to.host, stanza.to.resource; | |
197 | local destuser = hosts[host].sessions[node]; | |
198 | if destuser then | |
199 | if resource and destuser[resource] then | |
200 | destuser[resource]:send(stanza); | |
201 | else | |
202 | -- Bare JID, or resource offline | |
203 | local best_session; | |
204 | for resource, session in pairs(destuser.sessions) do | |
205 | if not best_session then best_session = session; | |
206 | elseif session.priority >= best_session.priority and session.priority >= 0 then | |
207 | best_session = session; | |
208 | end | |
209 | end | |
210 | if not best_session then | |
211 | offlinemessage.new(node, host, stanza); | |
212 | else | |
213 | print("resource '"..resource.."' was not online, have chosen to send to '"..best_session.username.."@"..best_session.host.."/"..best_session.resource.."'"); | |
214 | destuser[best_session]:send(stanza); | |
215 | end | |
216 | end | |
217 | else | |
218 | -- User is offline | |
219 | offlinemessage.new(node, host, stanza); | |
220 | end | |
221 | end | |
222 | ||
223 | function handle_stanza_presence_to_local_user(stanza) | |
224 | local node, host, resource = stanza.to.node, stanza.to.host, stanza.to.resource; | |
225 | local destuser = hosts[host].sessions[node]; | |
226 | if destuser then | |
227 | if resource then | |
228 | if destuser[resource] then | |
229 | destuser[resource]:send(stanza); | |
230 | else | |
231 | return; | |
232 | end | |
233 | else | |
234 | -- Broadcast to all user's resources | |
235 | for resource, session in pairs(destuser.sessions) do | |
236 | session:send(stanza); | |
237 | end | |
238 | end | |
239 | end | |
240 | end | |
241 | ||
242 | function handle_stanza_iq_to_local_user(stanza) | |
243 | ||
244 | end | |
245 | ||
246 | function foo() | |
247 | local node, host, resource = stanza.to.node, stanza.to.host, stanza.to.resource; | |
248 | local destuser = hosts[host].sessions[node]; | |
249 | if destuser and destuser.sessions then | |
250 | -- User online | |
251 | if resource and destuser.sessions[resource] then | |
252 | stanza.to:send(stanza); | |
253 | else | |
254 | --User is online, but specified resource isn't (or no resource specified) | |
255 | local best_session; | |
256 | for resource, session in pairs(destuser.sessions) do | |
257 | if not best_session then best_session = session; | |
258 | elseif session.priority >= best_session.priority and session.priority >= 0 then | |
259 | best_session = session; | |
260 | end | |
261 | end | |
262 | if not best_session then | |
263 | offlinemessage.new(node, host, stanza); | |
264 | else | |
265 | print("resource '"..resource.."' was not online, have chosen to send to '"..best_session.username.."@"..best_session.host.."/"..best_session.resource.."'"); | |
266 | resource = best_session.resource; | |
267 | end | |
268 | end | |
269 | if destuser.sessions[resource] == session then | |
270 | log("warn", "core", "Attempt to send stanza to self, dropping..."); | |
271 | else | |
272 | print("...sending...", tostring(stanza)); | |
273 | --destuser.sessions[resource].conn.write(tostring(data)); | |
274 | print(" to conn ", destuser.sessions[resource].conn); | |
275 | destuser.sessions[resource].conn.write(tostring(stanza)); | |
276 | print("...sent") | |
277 | end | |
278 | elseif stanza.name == "message" then | |
279 | print(" ...will be stored offline"); | |
280 | offlinemessage.new(node, host, stanza); | |
281 | elseif stanza.name == "iq" then | |
282 | print(" ...is an iq"); | |
283 | stanza.from:send(st.reply(stanza) | |
284 | :tag("error", { type = "cancel" }) | |
285 | :tag("service-unavailable", { xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas" })); | |
286 | end | |
287 | end | |
288 | ||
289 | -- Broadcast a presence stanza to all of a user's contacts | |
290 | function handle_stanza_presence_broadcast(session, stanza) | |
291 | if session.roster then | |
292 | local initial_presence = not session.last_presence; | |
293 | session.last_presence = stanza; | |
294 | ||
295 | -- Broadcast presence and probes | |
296 | local broadcast = st.presence({ from = session.full_jid, type = stanza.attr.type }); | |
297 | ||
298 | for child in stanza:childtags() do | |
299 | broadcast:add_child(child); | |
300 | end | |
301 | for contact_jid in pairs(session.roster) do | |
302 | broadcast.attr.to = contact_jid; | |
303 | send_to(contact_jid, broadcast); | |
304 | if initial_presence then | |
305 | local node, host = jid.split(contact_jid); | |
306 | if hosts[host] and hosts[host].type == "local" then | |
307 | local contact = hosts[host].sessions[node] | |
308 | if contact then | |
309 | local pres = st.presence { to = session.full_jid }; | |
310 | for resource, contact_session in pairs(contact.sessions) do | |
311 | if contact_session.last_presence then | |
312 | pres.tags = contact_session.last_presence.tags; | |
313 | pres.attr.from = contact_session.full_jid; | |
314 | send(pres); | |
315 | end | |
316 | end | |
317 | end | |
318 | --FIXME: Do we send unavailable if they are offline? | |
319 | else | |
320 | probe.attr.to = contact; | |
321 | send_to(contact, probe); | |
322 | end | |
323 | end | |
324 | end | |
325 | ||
326 | -- Probe for our contacts' presence | |
327 | end | |
328 | end | |
329 | ||
330 | -- Broadcast presence probes to all of a user's contacts | |
331 | function handle_stanza_presence_probe_broadcast(session, stanza) | |
332 | end | |
333 | ||
334 | -- | |
335 | function handle_stanza_to_server(stanza) | |
336 | end | |
337 | ||
338 | function handle_stanza_iq_no_to(session, stanza) | |
339 | end | |
340 | ]] |