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core/stanza_router.lua @ 73:937448005121
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| author | Waqas Hussain <waqas20@gmail.com> |
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| date | Wed, 08 Oct 2008 17:06:51 +0500 |
| parent | 72:e78db62beebc |
| child | 78:972e31cc91e8 |
| rev | line source |
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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 |
| 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 |
| 30 | 20 local to = stanza.attr.to; |
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21 stanza.attr.from = origin.full_jid -- quick fix to prevent impersonation |
| 30 | 22 |
| 23 if not to or (hosts[to] and hosts[to].type == "local") then | |
| 24 core_handle_stanza(origin, stanza); | |
| 25 elseif origin.type == "c2s" then | |
| 26 core_route_stanza(origin, stanza); | |
| 27 end | |
| 28 end | |
| 29 | |
| 30 function core_handle_stanza(origin, stanza) | |
| 31 -- Handlers | |
| 32 if origin.type == "c2s" or origin.type == "c2s_unauthed" then | |
| 33 local session = origin; | |
| 34 stanza.attr.from = session.full_jid; | |
| 35 | |
| 36 log("debug", "Routing stanza"); | |
| 37 -- Stanza has no to attribute | |
| 38 --local to_node, to_host, to_resource = jid_split(stanza.attr.to); | |
| 39 --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 | |
| 40 | |
| 41 -- Stanza is to this server, or a user on this server | |
| 42 log("debug", "Routing stanza to local"); | |
| 43 handle_stanza(session, stanza); | |
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44 end |
| 30 | 45 end |
| 46 | |
| 47 function core_route_stanza(origin, stanza) | |
| 48 -- Hooks | |
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49 --- ...later |
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50 |
| 30 | 51 -- Deliver |
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52 local node, host, resource = jid_split(stanza.attr.to); |
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53 local host_session = hosts[host] |
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54 if host_session and host_session.type == "local" then |
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55 -- Local host |
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56 local user = host_session.sessions[node]; |
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57 if user then |
| 72 | 58 local res = user.sessions[resource]; |
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59 -- TODO do something about presence broadcast |
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60 if not res then |
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61 -- if we get here, resource was not specified or was unavailable |
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62 for k in pairs(user.sessions) do |
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63 res = user.sessions[k]; |
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64 break; |
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65 end |
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66 -- TODO find resource with greatest priority |
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67 end |
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68 stanza.attr.to = res.full_jid; |
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69 send(res, stanza); -- Yay \o/ |
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70 else |
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71 -- user not found |
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72 send(origin, st.error_reply(stanza, "cancel", "service-unavailable")); |
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73 end |
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74 else |
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75 -- Remote host |
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76 if host_session then |
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77 -- Send to session |
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78 else |
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79 -- Need to establish the connection |
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80 end |
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81 end |
| 30 | 82 end |
| 83 | |
| 84 function handle_stanza_nodest(stanza) | |
| 85 if stanza.name == "iq" then | |
| 86 handle_stanza_iq_no_to(session, stanza); | |
| 87 elseif stanza.name == "presence" then | |
| 88 -- Broadcast to this user's contacts | |
| 89 handle_stanza_presence_broadcast(session, stanza); | |
| 90 -- also, if it is initial presence, send out presence probes | |
| 91 if not session.last_presence then | |
| 92 handle_stanza_presence_probe_broadcast(session, stanza); | |
| 93 end | |
| 94 session.last_presence = stanza; | |
| 95 elseif stanza.name == "message" then | |
| 96 -- Treat as if message was sent to bare JID of the sender | |
| 97 handle_stanza_to_local_user(stanza); | |
| 98 end | |
| 99 end | |
| 100 | |
| 101 function handle_stanza_tolocal(stanza) | |
| 102 local node, host, resource = jid.split(stanza.attr.to); | |
| 103 if host and hosts[host] and hosts[host].type == "local" then | |
| 104 -- Is a local host, handle internally | |
| 105 if node then | |
| 106 -- Is a local user, send to their session | |
| 107 log("debug", "Routing stanza to %s@%s", node, host); | |
| 108 if not session.username then return; end --FIXME: Correct response when trying to use unauthed stream is what? | |
| 109 handle_stanza_to_local_user(stanza); | |
| 110 else | |
| 111 -- Is sent to this server, let's handle it... | |
| 112 log("debug", "Routing stanza to %s", host); | |
| 113 handle_stanza_to_server(stanza, session); | |
| 114 end | |
| 115 end | |
| 116 end | |
| 117 | |
| 118 function handle_stanza_toremote(stanza) | |
| 119 log("error", "Stanza bound for remote host, but s2s is not implemented"); | |
| 120 end | |
| 121 | |
| 122 | |
| 123 --[[ | |
| 124 local function route_c2s_stanza(session, stanza) | |
| 125 stanza.attr.from = session.full_jid; | |
| 126 if not stanza.attr.to and session.username then | |
| 127 -- Has no 'to' attribute, handle internally | |
| 128 if stanza.name == "iq" then | |
| 129 handle_stanza_iq_no_to(session, stanza); | |
| 130 elseif stanza.name == "presence" then | |
| 131 -- Broadcast to this user's contacts | |
| 132 handle_stanza_presence_broadcast(session, stanza); | |
| 133 -- also, if it is initial presence, send out presence probes | |
| 134 if not session.last_presence then | |
| 135 handle_stanza_presence_probe_broadcast(session, stanza); | |
| 136 end | |
| 137 session.last_presence = stanza; | |
| 138 elseif stanza.name == "message" then | |
| 139 -- Treat as if message was sent to bare JID of the sender | |
| 140 handle_stanza_to_local_user(stanza); | |
| 141 end | |
| 142 end | |
| 143 local node, host, resource = jid.split(stanza.attr.to); | |
| 144 if host and hosts[host] and hosts[host].type == "local" then | |
| 145 -- Is a local host, handle internally | |
| 146 if node then | |
| 147 -- Is a local user, send to their session | |
| 148 if not session.username then return; end --FIXME: Correct response when trying to use unauthed stream is what? | |
| 149 handle_stanza_to_local_user(stanza); | |
| 150 else | |
| 151 -- Is sent to this server, let's handle it... | |
| 152 handle_stanza_to_server(stanza, session); | |
| 153 end | |
| 154 else | |
| 155 -- Is not for us or a local user, route accordingly | |
| 156 route_s2s_stanza(stanza); | |
| 157 end | |
| 158 end | |
| 159 | |
| 160 function handle_stanza_no_to(session, stanza) | |
| 161 if not stanza.attr.id then log("warn", "<iq> without id attribute is invalid"); end | |
| 162 local xmlns = (stanza.tags[1].attr and stanza.tags[1].attr.xmlns); | |
| 163 if stanza.attr.type == "get" or stanza.attr.type == "set" then | |
| 164 if iq_handlers[xmlns] then | |
| 165 if iq_handlers[xmlns](stanza) then return; end; -- If handler returns true, it handled it | |
| 166 end | |
| 167 -- Oh, handler didn't handle it. Need to send service-unavailable now. | |
| 168 log("warn", "Unhandled namespace: "..xmlns); | |
| 169 session:send(format("<iq type='error' id='%s'><error type='cancel'><service-unavailable/></error></iq>", stanza.attr.id)); | |
| 170 return; -- All done! | |
| 171 end | |
| 172 end | |
| 173 | |
| 174 function handle_stanza_to_local_user(stanza) | |
| 175 if stanza.name == "message" then | |
| 176 handle_stanza_message_to_local_user(stanza); | |
| 177 elseif stanza.name == "presence" then | |
| 178 handle_stanza_presence_to_local_user(stanza); | |
| 179 elseif stanza.name == "iq" then | |
| 180 handle_stanza_iq_to_local_user(stanza); | |
| 181 end | |
| 182 end | |
| 183 | |
| 184 function handle_stanza_message_to_local_user(stanza) | |
| 185 local node, host, resource = stanza.to.node, stanza.to.host, stanza.to.resource; | |
| 186 local destuser = hosts[host].sessions[node]; | |
| 187 if destuser then | |
| 188 if resource and destuser[resource] then | |
| 189 destuser[resource]:send(stanza); | |
| 190 else | |
| 191 -- Bare JID, or resource offline | |
| 192 local best_session; | |
| 193 for resource, session in pairs(destuser.sessions) do | |
| 194 if not best_session then best_session = session; | |
| 195 elseif session.priority >= best_session.priority and session.priority >= 0 then | |
| 196 best_session = session; | |
| 197 end | |
| 198 end | |
| 199 if not best_session then | |
| 200 offlinemessage.new(node, host, stanza); | |
| 201 else | |
| 202 print("resource '"..resource.."' was not online, have chosen to send to '"..best_session.username.."@"..best_session.host.."/"..best_session.resource.."'"); | |
| 203 destuser[best_session]:send(stanza); | |
| 204 end | |
| 205 end | |
| 206 else | |
| 207 -- User is offline | |
| 208 offlinemessage.new(node, host, stanza); | |
| 209 end | |
| 210 end | |
| 211 | |
| 212 function handle_stanza_presence_to_local_user(stanza) | |
| 213 local node, host, resource = stanza.to.node, stanza.to.host, stanza.to.resource; | |
| 214 local destuser = hosts[host].sessions[node]; | |
| 215 if destuser then | |
| 216 if resource then | |
| 217 if destuser[resource] then | |
| 218 destuser[resource]:send(stanza); | |
| 219 else | |
| 220 return; | |
| 221 end | |
| 222 else | |
| 223 -- Broadcast to all user's resources | |
| 224 for resource, session in pairs(destuser.sessions) do | |
| 225 session:send(stanza); | |
| 226 end | |
| 227 end | |
| 228 end | |
| 229 end | |
| 230 | |
| 231 function handle_stanza_iq_to_local_user(stanza) | |
| 232 | |
| 233 end | |
| 234 | |
| 235 function foo() | |
| 236 local node, host, resource = stanza.to.node, stanza.to.host, stanza.to.resource; | |
| 237 local destuser = hosts[host].sessions[node]; | |
| 238 if destuser and destuser.sessions then | |
| 239 -- User online | |
| 240 if resource and destuser.sessions[resource] then | |
| 241 stanza.to:send(stanza); | |
| 242 else | |
| 243 --User is online, but specified resource isn't (or no resource specified) | |
| 244 local best_session; | |
| 245 for resource, session in pairs(destuser.sessions) do | |
| 246 if not best_session then best_session = session; | |
| 247 elseif session.priority >= best_session.priority and session.priority >= 0 then | |
| 248 best_session = session; | |
| 249 end | |
| 250 end | |
| 251 if not best_session then | |
| 252 offlinemessage.new(node, host, stanza); | |
| 253 else | |
| 254 print("resource '"..resource.."' was not online, have chosen to send to '"..best_session.username.."@"..best_session.host.."/"..best_session.resource.."'"); | |
| 255 resource = best_session.resource; | |
| 256 end | |
| 257 end | |
| 258 if destuser.sessions[resource] == session then | |
| 259 log("warn", "core", "Attempt to send stanza to self, dropping..."); | |
| 260 else | |
| 261 print("...sending...", tostring(stanza)); | |
| 262 --destuser.sessions[resource].conn.write(tostring(data)); | |
| 263 print(" to conn ", destuser.sessions[resource].conn); | |
| 264 destuser.sessions[resource].conn.write(tostring(stanza)); | |
| 265 print("...sent") | |
| 266 end | |
| 267 elseif stanza.name == "message" then | |
| 268 print(" ...will be stored offline"); | |
| 269 offlinemessage.new(node, host, stanza); | |
| 270 elseif stanza.name == "iq" then | |
| 271 print(" ...is an iq"); | |
| 272 stanza.from:send(st.reply(stanza) | |
| 273 :tag("error", { type = "cancel" }) | |
| 274 :tag("service-unavailable", { xmlns = "urn:ietf:params:xml:ns:xmpp-stanzas" })); | |
| 275 end | |
| 276 end | |
| 277 | |
| 278 -- Broadcast a presence stanza to all of a user's contacts | |
| 279 function handle_stanza_presence_broadcast(session, stanza) | |
| 280 if session.roster then | |
| 281 local initial_presence = not session.last_presence; | |
| 282 session.last_presence = stanza; | |
| 283 | |
| 284 -- Broadcast presence and probes | |
| 285 local broadcast = st.presence({ from = session.full_jid, type = stanza.attr.type }); | |
| 286 | |
| 287 for child in stanza:childtags() do | |
| 288 broadcast:add_child(child); | |
| 289 end | |
| 290 for contact_jid in pairs(session.roster) do | |
| 291 broadcast.attr.to = contact_jid; | |
| 292 send_to(contact_jid, broadcast); | |
| 293 if initial_presence then | |
| 294 local node, host = jid.split(contact_jid); | |
| 295 if hosts[host] and hosts[host].type == "local" then | |
| 296 local contact = hosts[host].sessions[node] | |
| 297 if contact then | |
| 298 local pres = st.presence { to = session.full_jid }; | |
| 299 for resource, contact_session in pairs(contact.sessions) do | |
| 300 if contact_session.last_presence then | |
| 301 pres.tags = contact_session.last_presence.tags; | |
| 302 pres.attr.from = contact_session.full_jid; | |
| 303 send(pres); | |
| 304 end | |
| 305 end | |
| 306 end | |
| 307 --FIXME: Do we send unavailable if they are offline? | |
| 308 else | |
| 309 probe.attr.to = contact; | |
| 310 send_to(contact, probe); | |
| 311 end | |
| 312 end | |
| 313 end | |
| 314 | |
| 315 -- Probe for our contacts' presence | |
| 316 end | |
| 317 end | |
| 318 | |
| 319 -- Broadcast presence probes to all of a user's contacts | |
| 320 function handle_stanza_presence_probe_broadcast(session, stanza) | |
| 321 end | |
| 322 | |
| 323 -- | |
| 324 function handle_stanza_to_server(stanza) | |
| 325 end | |
| 326 | |
| 327 function handle_stanza_iq_no_to(session, stanza) | |
| 328 end | |
| 329 ]] |
