core/stanza_router.lua

   1 -- Prosody IM v0.3
   2 -- Copyright (C) 2008-2009 Matthew Wild
   3 -- Copyright (C) 2008-2009 Waqas Hussain
   4 --
   5 -- This project is MIT/X11 licensed. Please see the
   6 -- COPYING file in the source package for more information.
   7 --
   8
   9
  10
  11 local log = require "util.logger".init("stanzarouter")
  12
  13 local st = require "util.stanza";
  14 local send_s2s = require "core.s2smanager".send_to_host;
  15 local user_exists = require "core.usermanager".user_exists;
  16
  17 local rostermanager = require "core.rostermanager";
  18 local sessionmanager = require "core.sessionmanager";
  19 local offlinemanager = require "core.offlinemanager";
  20
  21 local s2s_verify_dialback = require "core.s2smanager".verify_dialback;
  22 local s2s_make_authenticated = require "core.s2smanager".make_authenticated;
  23
  24 local modules_handle_stanza = require "core.modulemanager".handle_stanza;
  25 local component_handle_stanza = require "core.componentmanager".handle_stanza;
  26
  27 local handle_outbound_presence_subscriptions_and_probes = require "core.presencemanager".handle_outbound_presence_subscriptions_and_probes;
  28 local handle_inbound_presence_subscriptions_and_probes = require "core.presencemanager".handle_inbound_presence_subscriptions_and_probes;
  29 local handle_normal_presence = require "core.presencemanager".handle_normal_presence;
  30
  31 local format = string.format;
  32 local tostring = tostring;
  33 local t_concat = table.concat;
  34 local t_insert = table.insert;
  35 local tonumber = tonumber;
  36 local s_find = string.find;
  37
  38 local jid_split = require "util.jid".split;
  39 local jid_prepped_split = require "util.jid".prepped_split;
  40 local print = print;
  41 local function checked_error_reply(origin, stanza)
  42         if (stanza.attr.xmlns == "jabber:client" or stanza.attr.xmlns == "jabber:server") and stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then
  43                 origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); -- FIXME correct error?
  44         end
  45 end
  46
  47 function core_process_stanza(origin, stanza)
  48         (origin.log or log)("debug", "Received[%s]: %s", origin.type, stanza:top_tag())
  49
  50         if not stanza.attr.xmlns then stanza.attr.xmlns = "jabber:client"; end -- FIXME Hack. This should be removed when we fix namespace handling.
  51         -- TODO verify validity of stanza (as well as JID validity)
  52         if stanza.name == "iq" and not(#stanza.tags == 1 and stanza.tags[1].attr.xmlns) then
  53                 if stanza.attr.type == "set" or stanza.attr.type == "get" then
  54                         error("Invalid IQ");
  55                 elseif #stanza.tags > 1 and not(stanza.attr.type == "error" or stanza.attr.type == "result") then
  56                         error("Invalid IQ");
  57                 end
  58         end
  59
  60         if origin.type == "c2s" and not origin.full_jid
  61                 and not(stanza.name == "iq" and stanza.tags[1].name == "bind"
  62                                 and stanza.tags[1].attr.xmlns == "urn:ietf:params:xml:ns:xmpp-bind") then
  63                 error("Client MUST bind resource after auth");
  64         end
  65
  66         -- TODO also, stanzas should be returned to their original state before the function ends
  67         if origin.type == "c2s" then
  68                 stanza.attr.from = origin.full_jid;
  69         end
  70         local to, xmlns = stanza.attr.to, stanza.attr.xmlns;
  71         local from = stanza.attr.from;
  72         local node, host, resource;
  73         local from_node, from_host, from_resource;
  74         local to_bare, from_bare;
  75         if to then
  76                 node, host, resource = jid_prepped_split(to);
  77                 if not host then
  78                         error("Invalid to JID");
  79                 end
  80                 to_bare = node and (node.."@"..host) or host; -- bare JID
  81                 if resource then to = to_bare.."/"..resource; else to = to_bare; end
  82                 stanza.attr.to = to;
  83         end
  84         if from then
  85                 from_node, from_host, from_resource = jid_prepped_split(from);
  86                 if not from_host then
  87                         error("Invalid from JID");
  88                 end
  89                 from_bare = from_node and (from_node.."@"..from_host) or from_host; -- bare JID
  90                 if from_resource then from = from_bare.."/"..from_resource; else from = from_bare; end
  91                 stanza.attr.from = from;
  92         end
  93
  94         --[[if to and not(hosts[to]) and not(hosts[to_bare]) and (hosts[host] and hosts[host].type ~= "local") then -- not for us?
  95                 log("warn", "stanza recieved for a non-local server");
  96                 return; -- FIXME what should we do here?
  97         end]] -- FIXME
  98
  99         -- FIXME do stanzas not of jabber:client get handled by components?
 100         if (origin.type == "s2sin" or origin.type == "c2s") and (not xmlns or xmlns == "jabber:server" or xmlns == "jabber:client") then
 101                 if origin.type == "s2sin" and not origin.dummy then
 102                         local host_status = origin.hosts[from_host];
 103                         if not host_status or not host_status.authed then -- remote server trying to impersonate some other server?
 104                                 log("warn", "Received a stanza claiming to be from %s, over a conn authed for %s!", from_host, origin.from_host);
 105                                 return; -- FIXME what should we do here? does this work with subdomains?
 106                         end
 107                 end
 108                 if not to then
 109                         core_handle_stanza(origin, stanza);
 110                 elseif hosts[to] and hosts[to].type == "local" then -- directed at a local server
 111                         core_handle_stanza(origin, stanza);
 112                 elseif stanza.attr.xmlns and stanza.attr.xmlns ~= "jabber:client" and stanza.attr.xmlns ~= "jabber:server" then
 113                         modules_handle_stanza(host or origin.host or origin.to_host, origin, stanza);
 114                 elseif hosts[to] and hosts[to].type == "component" then -- hack to allow components to handle node@server/resource and server/resource
 115                         component_handle_stanza(origin, stanza);
 116                 elseif hosts[to_bare] and hosts[to_bare].type == "component" then -- hack to allow components to handle node@server
 117                         component_handle_stanza(origin, stanza);
 118                 elseif hosts[host] and hosts[host].type == "component" then -- directed at a component
 119                         component_handle_stanza(origin, stanza);
 120                 elseif origin.type == "c2s" and stanza.name == "presence" and stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" then
 121                         handle_outbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza);
 122                 elseif origin.type ~= "c2s" and stanza.name == "iq" and not resource then -- directed at bare JID
 123                         core_handle_stanza(origin, stanza);
 124                 else
 125                         if origin.type == "c2s" and stanza.name == "presence" and to ~= nil and not(origin.roster[to_bare] and (origin.roster[to_bare].subscription == "both" or origin.roster[to_bare].subscription == "from")) then
 126                                 origin.directed = origin.directed or {};
 127                                 t_insert(origin.directed, to); -- FIXME does it make more sense to add to_bare rather than to?
 128                         end
 129                         core_route_stanza(origin, stanza);
 130                 end
 131         else
 132                 core_handle_stanza(origin, stanza);
 133         end
 134 end
 135
 136 -- This function handles stanzas which are not routed any further,
 137 -- that is, they are handled by this server
 138 function core_handle_stanza(origin, stanza)
 139         -- Handlers
 140         if modules_handle_stanza(select(2, jid_split(stanza.attr.to)) or origin.host, origin, stanza) then return; end
 141         if origin.type == "c2s" or origin.type == "s2sin" then
 142                 if origin.type == "c2s" then
 143                         if stanza.name == "presence" and origin.roster then
 144                                 if stanza.attr.type == nil or stanza.attr.type == "unavailable" then
 145                                         handle_normal_presence(origin, stanza, core_route_stanza);
 146                                 else
 147                                         log("warn", "Unhandled c2s presence: %s", tostring(stanza));
 148                                         checked_error_reply(origin, stanza);
 149                                 end
 150                         else
 151                                 log("warn", "Unhandled c2s stanza: %s", tostring(stanza));
 152                                 checked_error_reply(origin, stanza);
 153                         end
 154                 else -- s2s stanzas
 155                         log("warn", "Unhandled s2s stanza: %s", tostring(stanza));
 156                         checked_error_reply(origin, stanza);
 157                 end
 158         else
 159                 log("warn", "Unhandled %s stanza: %s", origin.type, tostring(stanza));
 160                 checked_error_reply(origin, stanza);
 161         end
 162 end
 163
 164 function core_route_stanza(origin, stanza)
 165         -- Hooks
 166         --- ...later
 167
 168         -- Deliver
 169         local to = stanza.attr.to;
 170         local node, host, resource = jid_split(to);
 171         local to_bare = node and (node.."@"..host) or host; -- bare JID
 172         local from = stanza.attr.from;
 173         local from_node, from_host, from_resource = jid_split(from);
 174         local from_bare = from_node and (from_node.."@"..from_host) or from_host; -- bare JID
 175
 176         -- Auto-detect origin if not specified
 177         origin = origin or hosts[from_host];
 178         if not origin then return false; end
 179
 180         if stanza.name == "presence" and (stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable") then resource = nil; end
 181
 182         local host_session = hosts[host]
 183         if host_session and host_session.type == "local" then
 184                 -- Local host
 185                 local user = host_session.sessions[node];
 186                 if user then
 187                         local res = user.sessions[resource];
 188                         if not res then
 189                                 -- if we get here, resource was not specified or was unavailable
 190                                 if stanza.name == "presence" then
 191                                         if stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" then
 192                                                 handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza);
 193                                         else -- sender is available or unavailable
 194                                                 for _, session in pairs(user.sessions) do -- presence broadcast to all user resources.
 195                                                         if session.full_jid then -- FIXME should this be just for available resources? Do we need to check subscription?
 196                                                                 stanza.attr.to = session.full_jid; -- reset at the end of function
 197                                                                 session.send(stanza);
 198                                                         end
 199                                                 end
 200                                         end
 201                                 elseif stanza.name == "message" then -- select a resource to recieve message
 202                                         local priority = 0;
 203                                         local recipients = {};
 204                                         for _, session in pairs(user.sessions) do -- find resource with greatest priority
 205                                                 local p = session.priority or -1;
 206                                                 if p > priority then
 207                                                         priority = p;
 208                                                         recipients = {session};
 209                                                 elseif p == priority then
 210                                                         t_insert(recipients, session);
 211                                                 end
 212                                         end
 213                                         local count = 0;
 214                                         for _, session in pairs(recipients) do
 215                                                 session.send(stanza);
 216                                                 count = count + 1;
 217                                         end
 218                                         if count == 0 then
 219                                                 offlinemanager.store(node, host, stanza);
 220                                                 -- TODO deal with storage errors
 221                                         end
 222                                 else
 223                                         -- TODO send IQ error
 224                                 end
 225                         else
 226                                 -- User + resource is online...
 227                                 stanza.attr.to = res.full_jid; -- reset at the end of function
 228                                 res.send(stanza); -- Yay \o/
 229                         end
 230                 else
 231                         -- user not online
 232                         if user_exists(node, host) then
 233                                 if stanza.name == "presence" then
 234                                         if stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" then
 235                                                 handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza);
 236                                         else
 237                                                 -- TODO send unavailable presence or unsubscribed
 238                                         end
 239                                 elseif stanza.name == "message" then -- FIXME if full jid, then send out to resources with highest priority
 240                                         if stanza.attr.type == "chat" or stanza.attr.type == "normal" or not stanza.attr.type then
 241                                                 offlinemanager.store(node, host, stanza);
 242                                                 -- FIXME don't store messages with only chat state notifications
 243                                         end
 244                                         -- TODO allow configuration of offline storage
 245                                         -- TODO send error if not storing offline
 246                                 elseif stanza.name == "iq" then
 247                                         origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
 248                                 end
 249                         else -- user does not exist
 250                                 -- TODO we would get here for nodeless JIDs too. Do something fun maybe? Echo service? Let plugins use xmpp:server/resource addresses?
 251                                 if stanza.name == "presence" then
 252                                         local t = stanza.attr.type;
 253                                         if t == "subscribe" or t == "probe" then
 254                                                 origin.send(st.presence({from = to_bare, to = from_bare, type = "unsubscribed"}));
 255                                         end
 256                                         -- else ignore
 257                                 else
 258                                         origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
 259                                 end
 260                         end
 261                 end
 262         elseif origin.type == "c2s" then
 263                 -- Remote host
 264                 local xmlns = stanza.attr.xmlns;
 265                 --stanza.attr.xmlns = "jabber:server";
 266                 stanza.attr.xmlns = nil;
 267                 log("debug", "sending s2s stanza: %s", tostring(stanza));
 268                 send_s2s(origin.host, host, stanza); -- TODO handle remote routing errors
 269                 stanza.attr.xmlns = xmlns; -- reset
 270         elseif origin.type == "component" or origin.type == "local" then
 271                 -- Route via s2s for components and modules
 272                 log("debug", "Routing outgoing stanza for %s to %s", origin.host, host);
 273                 send_s2s(origin.host, host, stanza);
 274         else
 275                 log("warn", "received stanza from unhandled connection type: %s", origin.type);
 276         end
 277         stanza.attr.to = to; -- reset
 278 end