core/stanza_router.lua

   1
   2 local log = require "util.logger".init("stanzarouter")
   3
   4 local st = require "util.stanza";
   5 local send_s2s = require "core.s2smanager".send_to_host;
   6 local user_exists = require "core.usermanager".user_exists;
   7
   8 local rostermanager = require "core.rostermanager";
   9 local sessionmanager = require "core.sessionmanager";
  10 local offlinemanager = require "core.offlinemanager";
  11
  12 local s2s_verify_dialback = require "core.s2smanager".verify_dialback;
  13 local s2s_make_authenticated = require "core.s2smanager".make_authenticated;
  14
  15 local modules_handle_stanza = require "core.modulemanager".handle_stanza;
  16 local component_handle_stanza = require "core.componentmanager".handle_stanza;
  17
  18 local handle_outbound_presence_subscriptions_and_probes = require "core.presencemanager".handle_outbound_presence_subscriptions_and_probes;
  19 local handle_inbound_presence_subscriptions_and_probes = require "core.presencemanager".handle_inbound_presence_subscriptions_and_probes;
  20
  21 local format = string.format;
  22 local tostring = tostring;
  23 local t_concat = table.concat;
  24 local t_insert = table.insert;
  25 local tonumber = tonumber;
  26 local s_find = string.find;
  27
  28 local jid_split = require "util.jid".split;
  29 local print = print;
  30
  31 function core_process_stanza(origin, stanza)
  32         (origin.log or log)("debug", "Received[%s]: %s", origin.type, stanza:pretty_print()) --top_tag())
  33
  34         if not stanza.attr.xmlns then stanza.attr.xmlns = "jabber:client"; end -- FIXME Hack. This should be removed when we fix namespace handling.
  35         -- TODO verify validity of stanza (as well as JID validity)
  36         if stanza.name == "iq" and not(#stanza.tags == 1 and stanza.tags[1].attr.xmlns) then
  37                 if stanza.attr.type == "set" or stanza.attr.type == "get" then
  38                         error("Invalid IQ");
  39                 elseif #stanza.tags > 1 and not(stanza.attr.type == "error" or stanza.attr.type == "result") then
  40                         error("Invalid IQ");
  41                 end
  42         end
  43
  44         if origin.type == "c2s" and not origin.full_jid
  45                 and not(stanza.name == "iq" and stanza.tags[1].name == "bind"
  46                                 and stanza.tags[1].attr.xmlns == "urn:ietf:params:xml:ns:xmpp-bind") then
  47                 error("Client MUST bind resource after auth");
  48         end
  49
  50         -- TODO also, stanzas should be returned to their original state before the function ends
  51         if origin.type == "c2s" then
  52                 stanza.attr.from = origin.full_jid;
  53         end
  54         local to = stanza.attr.to;
  55         local node, host, resource = jid_split(to);
  56         local to_bare = node and (node.."@"..host) or host; -- bare JID
  57         local from = stanza.attr.from;
  58         local from_node, from_host, from_resource = jid_split(from);
  59         local from_bare = from_node and (from_node.."@"..from_host) or from_host; -- bare JID
  60
  61         if origin.type == "s2sin" then
  62                 if origin.from_host ~= from_host then -- remote server trying to impersonate some other server?
  63                         log("warn", "Received a stanza claiming to be from %s, over a conn authed for %s!", from, origin.from_host);
  64                         return; -- FIXME what should we do here? does this work with subdomains?
  65                 end
  66         end
  67         --[[if to and not(hosts[to]) and not(hosts[to_bare]) and (hosts[host] and hosts[host].type ~= "local") then -- not for us?
  68                 log("warn", "stanza recieved for a non-local server");
  69                 return; -- FIXME what should we do here?
  70         end]] -- FIXME
  71
  72         -- FIXME do stanzas not of jabber:client get handled by components?
  73         if origin.type == "s2sin" or origin.type == "c2s" then
  74                 if not to then
  75                         core_handle_stanza(origin, stanza);
  76                 elseif hosts[to] and hosts[to].type == "local" then -- directed at a local server
  77                         core_handle_stanza(origin, stanza);
  78                 elseif stanza.attr.xmlns and stanza.attr.xmlns ~= "jabber:client" and stanza.attr.xmlns ~= "jabber:server" then
  79                         modules_handle_stanza(host or origin.host or origin.to_host, origin, stanza);
  80                 elseif hosts[to_bare] and hosts[to_bare].type == "component" then -- hack to allow components to handle node@server
  81                         component_handle_stanza(origin, stanza);
  82                 elseif hosts[to] and hosts[to].type == "component" then -- hack to allow components to handle node@server/resource and server/resource
  83                         component_handle_stanza(origin, stanza);
  84                 elseif hosts[host] and hosts[host].type == "component" then -- directed at a component
  85                         component_handle_stanza(origin, stanza);
  86                 elseif origin.type == "c2s" and stanza.name == "presence" and stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" then
  87                         handle_outbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza);
  88                 elseif origin.type ~= "c2s" and stanza.name == "iq" and not resource then -- directed at bare JID
  89                         core_handle_stanza(origin, stanza);
  90                 else
  91                         core_route_stanza(origin, stanza);
  92                 end
  93         else
  94                 core_handle_stanza(origin, stanza);
  95         end
  96 end
  97
  98 -- This function handles stanzas which are not routed any further,
  99 -- that is, they are handled by this server
 100 function core_handle_stanza(origin, stanza)
 101         -- Handlers
 102         if modules_handle_stanza(stanza.attr.to or origin.host, origin, stanza) then return; end
 103         if origin.type == "c2s" or origin.type == "c2s_unauthed" then
 104                 local session = origin;
 105
 106                 if stanza.name == "presence" and origin.roster then
 107                         if stanza.attr.type == nil or stanza.attr.type == "unavailable" then
 108                                 for jid in pairs(origin.roster) do -- broadcast to all interested contacts
 109                                         local subscription = origin.roster[jid].subscription;
 110                                         if subscription == "both" or subscription == "from" then
 111                                                 stanza.attr.to = jid;
 112                                                 core_route_stanza(origin, stanza);
 113                                         end
 114                                 end
 115                                 local node, host = jid_split(stanza.attr.from);
 116                                 for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast to all resources
 117                                         if res ~= origin and res.full_jid then -- to resource. FIXME is res.full_jid the correct check? Maybe it should be res.presence
 118                                                 stanza.attr.to = res.full_jid;
 119                                                 core_route_stanza(origin, stanza);
 120                                         end
 121                                 end
 122                                 if stanza.attr.type == nil and not origin.presence then -- initial presence
 123                                         local probe = st.presence({from = origin.full_jid, type = "probe"});
 124                                         for jid in pairs(origin.roster) do -- probe all contacts we are subscribed to
 125                                                 local subscription = origin.roster[jid].subscription;
 126                                                 if subscription == "both" or subscription == "to" then
 127                                                         probe.attr.to = jid;
 128                                                         core_route_stanza(origin, probe);
 129                                                 end
 130                                         end
 131                                         for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast from all available resources
 132                                                 if res ~= origin and res.presence then
 133                                                         res.presence.attr.to = origin.full_jid;
 134                                                         core_route_stanza(res, res.presence);
 135                                                         res.presence.attr.to = nil;
 136                                                 end
 137                                         end
 138                                         if origin.roster.pending then -- resend incoming subscription requests
 139                                                 for jid in pairs(origin.roster.pending) do
 140                                                         origin.send(st.presence({type="subscribe", from=jid})); -- TODO add to attribute? Use original?
 141                                                 end
 142                                         end
 143                                         local request = st.presence({type="subscribe", from=origin.username.."@"..origin.host});
 144                                         for jid, item in pairs(origin.roster) do -- resend outgoing subscription requests
 145                                                 if item.ask then
 146                                                         request.attr.to = jid;
 147                                                         core_route_stanza(origin, request);
 148                                                 end
 149                                         end
 150                                         for _, msg in ipairs(offlinemanager.load(node, host) or {}) do
 151                                                 origin.send(msg); -- FIXME do we need to modify to/from in any way?
 152                                         end
 153                                         offlinemanager.deleteAll(node, host);
 154                                 end
 155                                 origin.priority = 0;
 156                                 if stanza.attr.type == "unavailable" then
 157                                         origin.presence = nil;
 158                                 else
 159                                         origin.presence = stanza;
 160                                         local priority = stanza:child_with_name("priority");
 161                                         if priority and #priority > 0 then
 162                                                 priority = t_concat(priority);
 163                                                 if s_find(priority, "^[+-]?[0-9]+$") then
 164                                                         priority = tonumber(priority);
 165                                                         if priority < -128 then priority = -128 end
 166                                                         if priority > 127 then priority = 127 end
 167                                                         origin.priority = priority;
 168                                                 end
 169                                         end
 170                                 end
 171                                 stanza.attr.to = nil; -- reset it
 172                         else
 173                                 log("warn", "Unhandled c2s presence: %s", tostring(stanza));
 174                                 if (stanza.attr.xmlns == "jabber:client" or stanza.attr.xmlns == "jabber:server") and stanza.attr.type ~= "error" then
 175                                         origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); -- FIXME correct error?
 176                                 end
 177                         end
 178                 else
 179                         log("warn", "Unhandled c2s stanza: %s", tostring(stanza));
 180                         if (stanza.attr.xmlns == "jabber:client" or stanza.attr.xmlns == "jabber:server") and stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then
 181                                 origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); -- FIXME correct error?
 182                         end
 183                 end -- TODO handle other stanzas
 184         else
 185                 log("warn", "Unhandled origin: %s", origin.type);
 186                 if (stanza.attr.xmlns == "jabber:client" or stanza.attr.xmlns == "jabber:server") and stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then
 187                         -- s2s stanzas can get here
 188                         origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); -- FIXME correct error?
 189                 end
 190         end
 191 end
 192
 193 function core_route_stanza(origin, stanza)
 194         -- Hooks
 195         --- ...later
 196
 197         -- Deliver
 198         local to = stanza.attr.to;
 199         local node, host, resource = jid_split(to);
 200         local to_bare = node and (node.."@"..host) or host; -- bare JID
 201         local from = stanza.attr.from;
 202         local from_node, from_host, from_resource = jid_split(from);
 203         local from_bare = from_node and (from_node.."@"..from_host) or from_host; -- bare JID
 204
 205         -- Auto-detect origin if not specified
 206         origin = origin or hosts[from_host];
 207         if not origin then return false; end
 208
 209         if stanza.name == "presence" and (stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable") then resource = nil; end
 210
 211         local host_session = hosts[host]
 212         if host_session and host_session.type == "local" then
 213                 -- Local host
 214                 local user = host_session.sessions[node];
 215                 if user then
 216                         local res = user.sessions[resource];
 217                         if not res then
 218                                 -- if we get here, resource was not specified or was unavailable
 219                                 if stanza.name == "presence" then
 220                                         if stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" then
 221                                                 handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza);
 222                                         else -- sender is available or unavailable
 223                                                 for _, session in pairs(user.sessions) do -- presence broadcast to all user resources.
 224                                                         if session.full_jid then -- FIXME should this be just for available resources? Do we need to check subscription?
 225                                                                 stanza.attr.to = session.full_jid; -- reset at the end of function
 226                                                                 session.send(stanza);
 227                                                         end
 228                                                 end
 229                                         end
 230                                 elseif stanza.name == "message" then -- select a resource to recieve message
 231                                         local priority = 0;
 232                                         local recipients = {};
 233                                         for _, session in pairs(user.sessions) do -- find resource with greatest priority
 234                                                 local p = session.priority;
 235                                                 if p > priority then
 236                                                         priority = p;
 237                                                         recipients = {session};
 238                                                 elseif p == priority then
 239                                                         t_insert(recipients, session);
 240                                                 end
 241                                         end
 242                                         local count = 0;
 243                                         for _, session in pairs(recipients) do
 244                                                 session.send(stanza);
 245                                                 count = count + 1;
 246                                         end
 247                                         if count == 0 then
 248                                                 offlinemanager.store(node, host, stanza);
 249                                                 -- TODO deal with storage errors
 250                                         end
 251                                 else
 252                                         -- TODO send IQ error
 253                                 end
 254                         else
 255                                 -- User + resource is online...
 256                                 stanza.attr.to = res.full_jid; -- reset at the end of function
 257                                 res.send(stanza); -- Yay \o/
 258                         end
 259                 else
 260                         -- user not online
 261                         if user_exists(node, host) then
 262                                 if stanza.name == "presence" then
 263                                         if stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" then
 264                                                 handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza);
 265                                         else
 266                                                 -- TODO send unavailable presence or unsubscribed
 267                                         end
 268                                 elseif stanza.name == "message" then
 269                                         if stanza.attr.type == "chat" or stanza.attr.type == "normal" or not stanza.attr.type then
 270                                                 offlinemanager.store(node, host, stanza);
 271                                                 -- FIXME don't store messages with only chat state notifications
 272                                         end
 273                                         -- TODO allow configuration of offline storage
 274                                         -- TODO send error if not storing offline
 275                                 elseif stanza.name == "iq" then
 276                                         -- TODO send IQ error
 277                                 end
 278                         else -- user does not exist
 279                                 -- TODO we would get here for nodeless JIDs too. Do something fun maybe? Echo service? Let plugins use xmpp:server/resource addresses?
 280                                 if stanza.name == "presence" then
 281                                         if stanza.attr.type == "probe" then
 282                                                 origin.send(st.presence({from = to_bare, to = from_bare, type = "unsubscribed"}));
 283                                         end
 284                                         -- else ignore
 285                                 else
 286                                         origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
 287                                 end
 288                         end
 289                 end
 290         elseif origin.type == "c2s" then
 291                 -- Remote host
 292                 local xmlns = stanza.attr.xmlns;
 293                 --stanza.attr.xmlns = "jabber:server";
 294                 stanza.attr.xmlns = nil;
 295                 log("debug", "sending s2s stanza: %s", tostring(stanza));
 296                 send_s2s(origin.host, host, stanza); -- TODO handle remote routing errors
 297                 stanza.attr.xmlns = xmlns; -- reset
 298         elseif origin.type == "component" or origin.type == "local" then
 299                 -- Route via s2s for components and modules
 300                 log("debug", "Routing outgoing stanza for %s to %s", origin.host, host);
 301                 send_s2s(origin.host, host, stanza);
 302         else
 303                 log("warn", "received stanza from unhandled connection type: %s", origin.type);
 304         end
 305         stanza.attr.to = to; -- reset
 306 end
 307
 308 function handle_stanza_toremote(stanza)
 309         log("error", "Stanza bound for remote host, but s2s is not implemented");
 310 end
 311
 312