core/stanza_router.lua

   1 -- Prosody IM v0.4
   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 hosts = _G.hosts;
  14
  15 local st = require "util.stanza";
  16 local send_s2s = require "core.s2smanager".send_to_host;
  17 local user_exists = require "core.usermanager".user_exists;
  18
  19 local rostermanager = require "core.rostermanager";
  20 local sessionmanager = require "core.sessionmanager";
  21 local offlinemanager = require "core.offlinemanager";
  22
  23 local s2s_verify_dialback = require "core.s2smanager".verify_dialback;
  24 local s2s_make_authenticated = require "core.s2smanager".make_authenticated;
  25
  26 local modules_handle_stanza = require "core.modulemanager".handle_stanza;
  27 local component_handle_stanza = require "core.componentmanager".handle_stanza;
  28
  29 local handle_outbound_presence_subscriptions_and_probes = function()end;--require "core.presencemanager".handle_outbound_presence_subscriptions_and_probes;
  30 local handle_inbound_presence_subscriptions_and_probes = function()end;--require "core.presencemanager".handle_inbound_presence_subscriptions_and_probes;
  31 local handle_normal_presence = function()end;--require "core.presencemanager".handle_normal_presence;
  32
  33 local format = string.format;
  34 local tostring = tostring;
  35 local t_concat = table.concat;
  36 local t_insert = table.insert;
  37 local tonumber = tonumber;
  38 local s_find = string.find;
  39 local pairs = pairs;
  40 local ipairs = ipairs;
  41
  42 local jid_split = require "util.jid".split;
  43 local jid_prepped_split = require "util.jid".prepped_split;
  44 local print = print;
  45 local fire_event = require "core.eventmanager2".fire_event;
  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.attr.type == "error" and #stanza.tags == 0 then return; end -- TODO invalid stanza, log
  53         if stanza.name == "iq" then
  54                 if (stanza.attr.type == "set" or stanza.attr.type == "get") and #stanza.tags ~= 1 then
  55                         origin.send(st.error_reply(stanza, "modify", "bad-request"));
  56                         return;
  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                         log("warn", "Received stanza with invalid destination JID: %s", to);
  79                         origin.send(st.error_reply(stanza, "modify", "jid-malformed", "The destination address is invalid: "..to));
  80                         return;
  81                 end
  82                 to_bare = node and (node.."@"..host) or host; -- bare JID
  83                 if resource then to = to_bare.."/"..resource; else to = to_bare; end
  84                 stanza.attr.to = to;
  85         end
  86         if from then
  87                 -- We only stamp the 'from' on c2s stanzas, so we still need to check validity
  88                 from_node, from_host, from_resource = jid_prepped_split(from);
  89                 if not from_host then
  90                         log("warn", "Received stanza with invalid source JID: %s", from);
  91                         origin.send(st.error_reply(stanza, "modify", "jid-malformed", "The source address is invalid: "..from));
  92                         return;
  93                 end
  94                 from_bare = from_node and (from_node.."@"..from_host) or from_host; -- bare JID
  95                 if from_resource then from = from_bare.."/"..from_resource; else from = from_bare; end
  96                 stanza.attr.from = from;
  97         end
  98
  99         --[[if to and not(hosts[to]) and not(hosts[to_bare]) and (hosts[host] and hosts[host].type ~= "local") then -- not for us?
 100                 log("warn", "stanza recieved for a non-local server");
 101                 return; -- FIXME what should we do here?
 102         end]] -- FIXME
 103
 104         if (origin.type == "s2sin" or origin.type == "c2s" or origin.type == "component") and xmlns == "jabber:client" then
 105                 if origin.type == "s2sin" and not origin.dummy then
 106                         local host_status = origin.hosts[from_host];
 107                         if not host_status or not host_status.authed then -- remote server trying to impersonate some other server?
 108                                 log("warn", "Received a stanza claiming to be from %s, over a conn authed for %s!", from_host, origin.from_host);
 109                                 return; -- FIXME what should we do here? does this work with subdomains?
 110                         end
 111                 end
 112                 local event_data = {origin=origin, stanza=stanza};
 113                 if fire_event(tostring(host or origin.host).."/"..stanza.name, event_data) then
 114                         -- event handled
 115                 elseif not to then
 116                         core_handle_stanza(origin, stanza);
 117                 elseif hosts[to] and hosts[to].type == "local" then -- directed at a local server
 118                         core_handle_stanza(origin, stanza);
 119                 elseif hosts[to] and hosts[to].type == "component" then -- hack to allow components to handle node@server/resource and server/resource
 120                         component_handle_stanza(origin, stanza);
 121                 elseif hosts[to_bare] and hosts[to_bare].type == "component" then -- hack to allow components to handle node@server
 122                         component_handle_stanza(origin, stanza);
 123                 elseif hosts[host] and hosts[host].type == "component" then -- directed at a component
 124                         component_handle_stanza(origin, stanza);
 125                 elseif hosts[host] and hosts[host].type == "local" and stanza.name == "iq" and not resource then -- directed at bare JID
 126                         core_handle_stanza(origin, stanza);
 127                 else
 128                         core_route_stanza(origin, stanza);
 129                 end
 130         else
 131                 core_handle_stanza(origin, stanza);
 132         end
 133 end
 134
 135 -- This function handles stanzas which are not routed any further,
 136 -- that is, they are handled by this server
 137 function core_handle_stanza(origin, stanza)
 138         if not modules_handle_stanza(select(2, jid_split(stanza.attr.to)) or origin.host or origin.to_host, origin, stanza) then
 139                 log("warn", "Unhandled %s stanza: %s", origin.type, tostring(stanza));
 140                 if stanza.attr.xmlns == "jabber:client" then
 141                         if stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then
 142                                 origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
 143                         end
 144                 else
 145                         origin:close("unsupported-stanza-type");
 146                 end
 147         end
 148 end
 149
 150 function core_route_stanza(origin, stanza)
 151         -- Hooks
 152         --- ...later
 153
 154         -- Deliver
 155         local to = stanza.attr.to;
 156         local node, host, resource = jid_split(to);
 157         local to_bare = node and (node.."@"..host) or host; -- bare JID
 158         local from = stanza.attr.from;
 159         local from_node, from_host, from_resource = jid_split(from);
 160         local from_bare = from_node and (from_node.."@"..from_host) or from_host; -- bare JID
 161
 162         -- Auto-detect origin if not specified
 163         origin = origin or hosts[from_host];
 164         if not origin then return false; end
 165
 166         if hosts[to] and hosts[to].type == "component" then -- hack to allow components to handle node@server/resource and server/resource
 167                 return component_handle_stanza(origin, stanza);
 168         elseif hosts[to_bare] and hosts[to_bare].type == "component" then -- hack to allow components to handle node@server
 169                 return component_handle_stanza(origin, stanza);
 170         elseif hosts[host] and hosts[host].type == "component" then -- directed at a component
 171                 return component_handle_stanza(origin, stanza);
 172         end
 173
 174         if stanza.name == "presence" and (stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" and stanza.attr.type ~= "error") then resource = nil; end
 175
 176         local host_session = hosts[host]
 177         if host_session and host_session.type == "local" then
 178                 -- Local host
 179                 local user = host_session.sessions[node];
 180                 if user then
 181                         local res = user.sessions[resource];
 182                         if not res then
 183                                 -- if we get here, resource was not specified or was unavailable
 184                                 if stanza.name == "presence" then
 185                                         if stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" and stanza.attr.type ~= "error" then
 186                                                 handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza);
 187                                         elseif not resource then -- sender is available or unavailable or error
 188                                                 for _, session in pairs(user.sessions) do -- presence broadcast to all user resources.
 189                                                         if session.full_jid then -- FIXME should this be just for available resources? Do we need to check subscription?
 190                                                                 stanza.attr.to = session.full_jid; -- reset at the end of function
 191                                                                 session.send(stanza);
 192                                                         end
 193                                                 end
 194                                         end
 195                                 elseif stanza.name == "message" then -- select a resource to recieve message
 196                                         stanza.attr.to = to_bare;
 197                                         if stanza.attr.type == 'headline' then
 198                                                 for _, session in pairs(user.sessions) do -- find resource with greatest priority
 199                                                         if session.presence and session.priority >= 0 then
 200                                                                 session.send(stanza);
 201                                                         end
 202                                                 end
 203                                         elseif resource and stanza.attr.type == 'groupchat' then
 204                                                 -- Groupchat message sent to offline resource
 205                                                 origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
 206                                         else
 207                                                 local priority = 0;
 208                                                 local recipients = {};
 209                                                 for _, session in pairs(user.sessions) do -- find resource with greatest priority
 210                                                         if session.presence then
 211                                                                 local p = session.priority;
 212                                                                 if p > priority then
 213                                                                         priority = p;
 214                                                                         recipients = {session};
 215                                                                 elseif p == priority then
 216                                                                         t_insert(recipients, session);
 217                                                                 end
 218                                                         end
 219                                                 end
 220                                                 local count = 0;
 221                                                 for _, session in ipairs(recipients) do
 222                                                         session.send(stanza);
 223                                                         count = count + 1;
 224                                                 end
 225                                                 if count == 0 and (stanza.attr.type == "chat" or stanza.attr.type == "normal" or not stanza.attr.type) then
 226                                                         offlinemanager.store(node, host, stanza);
 227                                                         -- TODO deal with storage errors
 228                                                 end
 229                                         end
 230                                 elseif stanza.attr.type == "get" or stanza.attr.type == "set" then
 231                                         origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
 232                                 end
 233                         else
 234                                 -- User + resource is online...
 235                                 stanza.attr.to = res.full_jid; -- reset at the end of function
 236                                 res.send(stanza); -- Yay \o/
 237                         end
 238                 else
 239                         -- user not online
 240                         if user_exists(node, host) then
 241                                 if stanza.name == "presence" then
 242                                         if stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" and stanza.attr.type ~= "error" then
 243                                                 handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza);
 244                                         else
 245                                                 -- TODO send unavailable presence or unsubscribed
 246                                         end
 247                                 elseif stanza.name == "message" then -- FIXME if full jid, then send out to resources with highest priority
 248                                         stanza.attr.to = to_bare; -- TODO not in RFC, but seems obvious. Should discuss on the mailing list.
 249                                         if stanza.attr.type == "chat" or stanza.attr.type == "normal" or not stanza.attr.type then
 250                                                 offlinemanager.store(node, host, stanza);
 251                                                 -- FIXME don't store messages with only chat state notifications
 252                                         elseif stanza.attr.type == "groupchat" then
 253                                                 local reply = st.error_reply(stanza, "cancel", "service-unavailable");
 254                                                 reply.attr.from = to;
 255                                                 origin.send(reply);
 256                                         end
 257                                         -- TODO allow configuration of offline storage
 258                                         -- TODO send error if not storing offline
 259                                 elseif stanza.name == "iq" and (stanza.attr.type == "get" or stanza.attr.type == "set") then
 260                                         origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
 261                                 end
 262                         else -- user does not exist
 263                                 -- TODO we would get here for nodeless JIDs too. Do something fun maybe? Echo service? Let plugins use xmpp:server/resource addresses?
 264                                 if stanza.name == "presence" then
 265                                         local t = stanza.attr.type;
 266                                         if t == "subscribe" or t == "probe" then
 267                                                 origin.send(st.presence({from = to_bare, to = from_bare, type = "unsubscribed"}));
 268                                         end
 269                                         -- else ignore
 270                                 elseif stanza.attr.type ~= "error" and (stanza.name ~= "iq" or stanza.attr.type ~= "result") then
 271                                         origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
 272                                 end
 273                         end
 274                 end
 275         elseif origin.type == "c2s" then
 276                 -- Remote host
 277                 local xmlns = stanza.attr.xmlns;
 278                 --stanza.attr.xmlns = "jabber:server";
 279                 stanza.attr.xmlns = nil;
 280                 log("debug", "sending s2s stanza: %s", tostring(stanza));
 281                 send_s2s(origin.host, host, stanza); -- TODO handle remote routing errors
 282                 stanza.attr.xmlns = xmlns; -- reset
 283         elseif origin.type == "component" or origin.type == "local" then
 284                 -- Route via s2s for components and modules
 285                 log("debug", "Routing outgoing stanza for %s to %s", origin.host, host);
 286                 send_s2s(origin.host, host, stanza);
 287         else
 288                 log("warn", "received stanza from unhandled connection type: %s", origin.type);
 289         end
 290         stanza.attr.to = to; -- reset
 291 end