core/stanza_router.lua

   1 -- Prosody IM v0.1
   2 -- Copyright (C) 2008 Matthew Wild
   3 -- Copyright (C) 2008 Waqas Hussain
   4 --
   5 -- This program is free software; you can redistribute it and/or
   6 -- modify it under the terms of the GNU General Public License
   7 -- as published by the Free Software Foundation; either version 2
   8 -- of the License, or (at your option) any later version.
   9 --
  10 -- This program is distributed in the hope that it will be useful,
  11 -- but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 -- GNU General Public License for more details.
  14 --
  15 -- You should have received a copy of the GNU General Public License
  16 -- along with this program; if not, write to the Free Software
  17 -- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  18 --
  19
  20
  21
  22 local log = require "util.logger".init("stanzarouter")
  23
  24 local st = require "util.stanza";
  25 local send_s2s = require "core.s2smanager".send_to_host;
  26 local user_exists = require "core.usermanager".user_exists;
  27
  28 local rostermanager = require "core.rostermanager";
  29 local sessionmanager = require "core.sessionmanager";
  30 local offlinemanager = require "core.offlinemanager";
  31
  32 local s2s_verify_dialback = require "core.s2smanager".verify_dialback;
  33 local s2s_make_authenticated = require "core.s2smanager".make_authenticated;
  34
  35 local modules_handle_stanza = require "core.modulemanager".handle_stanza;
  36 local component_handle_stanza = require "core.componentmanager".handle_stanza;
  37
  38 local handle_outbound_presence_subscriptions_and_probes = require "core.presencemanager".handle_outbound_presence_subscriptions_and_probes;
  39 local handle_inbound_presence_subscriptions_and_probes = require "core.presencemanager".handle_inbound_presence_subscriptions_and_probes;
  40 local handle_normal_presence = require "core.presencemanager".handle_normal_presence;
  41
  42 local format = string.format;
  43 local tostring = tostring;
  44 local t_concat = table.concat;
  45 local t_insert = table.insert;
  46 local tonumber = tonumber;
  47 local s_find = string.find;
  48
  49 local jid_split = require "util.jid".split;
  50 local print = print;
  51
  52 function core_process_stanza(origin, stanza)
  53         (origin.log or log)("debug", "Received[%s]: %s", origin.type, stanza:pretty_print()) --top_tag())
  54
  55         if not stanza.attr.xmlns then stanza.attr.xmlns = "jabber:client"; end -- FIXME Hack. This should be removed when we fix namespace handling.
  56         -- TODO verify validity of stanza (as well as JID validity)
  57         if stanza.name == "iq" and not(#stanza.tags == 1 and stanza.tags[1].attr.xmlns) then
  58                 if stanza.attr.type == "set" or stanza.attr.type == "get" then
  59                         error("Invalid IQ");
  60                 elseif #stanza.tags > 1 and not(stanza.attr.type == "error" or stanza.attr.type == "result") then
  61                         error("Invalid IQ");
  62                 end
  63         end
  64
  65         if origin.type == "c2s" and not origin.full_jid
  66                 and not(stanza.name == "iq" and stanza.tags[1].name == "bind"
  67                                 and stanza.tags[1].attr.xmlns == "urn:ietf:params:xml:ns:xmpp-bind") then
  68                 error("Client MUST bind resource after auth");
  69         end
  70
  71         -- TODO also, stanzas should be returned to their original state before the function ends
  72         if origin.type == "c2s" then
  73                 stanza.attr.from = origin.full_jid;
  74         end
  75         local to = stanza.attr.to;
  76         local node, host, resource = jid_split(to);
  77         local to_bare = node and (node.."@"..host) or host; -- bare JID
  78         local from = stanza.attr.from;
  79         local from_node, from_host, from_resource = jid_split(from);
  80         local from_bare = from_node and (from_node.."@"..from_host) or from_host; -- bare JID
  81
  82         if origin.type == "s2sin" then
  83                 if origin.from_host ~= from_host then -- remote server trying to impersonate some other server?
  84                         log("warn", "Received a stanza claiming to be from %s, over a conn authed for %s!", from, origin.from_host);
  85                         return; -- FIXME what should we do here? does this work with subdomains?
  86                 end
  87         end
  88         --[[if to and not(hosts[to]) and not(hosts[to_bare]) and (hosts[host] and hosts[host].type ~= "local") then -- not for us?
  89                 log("warn", "stanza recieved for a non-local server");
  90                 return; -- FIXME what should we do here?
  91         end]] -- FIXME
  92
  93         -- FIXME do stanzas not of jabber:client get handled by components?
  94         if origin.type == "s2sin" or origin.type == "c2s" then
  95                 if not to then
  96                         core_handle_stanza(origin, stanza);
  97                 elseif hosts[to] and hosts[to].type == "local" then -- directed at a local server
  98                         core_handle_stanza(origin, stanza);
  99                 elseif stanza.attr.xmlns and stanza.attr.xmlns ~= "jabber:client" and stanza.attr.xmlns ~= "jabber:server" then
 100                         modules_handle_stanza(host or origin.host or origin.to_host, origin, stanza);
 101                 elseif hosts[to_bare] and hosts[to_bare].type == "component" then -- hack to allow components to handle node@server
 102                         component_handle_stanza(origin, stanza);
 103                 elseif hosts[to] and hosts[to].type == "component" then -- hack to allow components to handle node@server/resource and server/resource
 104                         component_handle_stanza(origin, stanza);
 105                 elseif hosts[host] and hosts[host].type == "component" then -- directed at a component
 106                         component_handle_stanza(origin, stanza);
 107                 elseif origin.type == "c2s" and stanza.name == "presence" and stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" then
 108                         handle_outbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza);
 109                 elseif origin.type ~= "c2s" and stanza.name == "iq" and not resource then -- directed at bare JID
 110                         core_handle_stanza(origin, stanza);
 111                 else
 112                         core_route_stanza(origin, stanza);
 113                 end
 114         else
 115                 core_handle_stanza(origin, stanza);
 116         end
 117 end
 118
 119 -- This function handles stanzas which are not routed any further,
 120 -- that is, they are handled by this server
 121 function core_handle_stanza(origin, stanza)
 122         -- Handlers
 123         if modules_handle_stanza(stanza.attr.to or origin.host, origin, stanza) then return; end
 124         if origin.type == "c2s" or origin.type == "s2sin" then
 125                 if origin.type == "c2s" then
 126                         if stanza.name == "presence" and origin.roster then
 127                                 if stanza.attr.type == nil or stanza.attr.type == "unavailable" then
 128                                         handle_normal_presence(origin, stanza, core_route_stanza);
 129                                 else
 130                                         log("warn", "Unhandled c2s presence: %s", tostring(stanza));
 131                                         if (stanza.attr.xmlns == "jabber:client" or stanza.attr.xmlns == "jabber:server") and stanza.attr.type ~= "error" then
 132                                                 origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); -- FIXME correct error?
 133                                         end
 134                                 end
 135                         else
 136                                 log("warn", "Unhandled c2s stanza: %s", tostring(stanza));
 137                                 if (stanza.attr.xmlns == "jabber:client" or stanza.attr.xmlns == "jabber:server") and stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then
 138                                         origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); -- FIXME correct error?
 139                                 end
 140                         end
 141                 else -- s2s stanzas
 142                         log("warn", "Unhandled s2s stanza: %s", tostring(stanza));
 143                         if (stanza.attr.xmlns == "jabber:client" or stanza.attr.xmlns == "jabber:server") and stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then
 144                                 origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); -- FIXME correct error?
 145                         end
 146                 end
 147         else
 148                 log("warn", "Unhandled %s stanza: %s", origin.type, tostring(stanza));
 149         end
 150 end
 151
 152 function core_route_stanza(origin, stanza)
 153         -- Hooks
 154         --- ...later
 155
 156         -- Deliver
 157         local to = stanza.attr.to;
 158         local node, host, resource = jid_split(to);
 159         local to_bare = node and (node.."@"..host) or host; -- bare JID
 160         local from = stanza.attr.from;
 161         local from_node, from_host, from_resource = jid_split(from);
 162         local from_bare = from_node and (from_node.."@"..from_host) or from_host; -- bare JID
 163
 164         -- Auto-detect origin if not specified
 165         origin = origin or hosts[from_host];
 166         if not origin then return false; end
 167
 168         if stanza.name == "presence" and (stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable") then resource = nil; end
 169
 170         local host_session = hosts[host]
 171         if host_session and host_session.type == "local" then
 172                 -- Local host
 173                 local user = host_session.sessions[node];
 174                 if user then
 175                         local res = user.sessions[resource];
 176                         if not res then
 177                                 -- if we get here, resource was not specified or was unavailable
 178                                 if stanza.name == "presence" then
 179                                         if stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" then
 180                                                 handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza);
 181                                         else -- sender is available or unavailable
 182                                                 for _, session in pairs(user.sessions) do -- presence broadcast to all user resources.
 183                                                         if session.full_jid then -- FIXME should this be just for available resources? Do we need to check subscription?
 184                                                                 stanza.attr.to = session.full_jid; -- reset at the end of function
 185                                                                 session.send(stanza);
 186                                                         end
 187                                                 end
 188                                         end
 189                                 elseif stanza.name == "message" then -- select a resource to recieve message
 190                                         local priority = 0;
 191                                         local recipients = {};
 192                                         for _, session in pairs(user.sessions) do -- find resource with greatest priority
 193                                                 local p = session.priority;
 194                                                 if p > priority then
 195                                                         priority = p;
 196                                                         recipients = {session};
 197                                                 elseif p == priority then
 198                                                         t_insert(recipients, session);
 199                                                 end
 200                                         end
 201                                         local count = 0;
 202                                         for _, session in pairs(recipients) do
 203                                                 session.send(stanza);
 204                                                 count = count + 1;
 205                                         end
 206                                         if count == 0 then
 207                                                 offlinemanager.store(node, host, stanza);
 208                                                 -- TODO deal with storage errors
 209                                         end
 210                                 else
 211                                         -- TODO send IQ error
 212                                 end
 213                         else
 214                                 -- User + resource is online...
 215                                 stanza.attr.to = res.full_jid; -- reset at the end of function
 216                                 res.send(stanza); -- Yay \o/
 217                         end
 218                 else
 219                         -- user not online
 220                         if user_exists(node, host) then
 221                                 if stanza.name == "presence" then
 222                                         if stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" then
 223                                                 handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza);
 224                                         else
 225                                                 -- TODO send unavailable presence or unsubscribed
 226                                         end
 227                                 elseif stanza.name == "message" then
 228                                         if stanza.attr.type == "chat" or stanza.attr.type == "normal" or not stanza.attr.type then
 229                                                 offlinemanager.store(node, host, stanza);
 230                                                 -- FIXME don't store messages with only chat state notifications
 231                                         end
 232                                         -- TODO allow configuration of offline storage
 233                                         -- TODO send error if not storing offline
 234                                 elseif stanza.name == "iq" then
 235                                         -- TODO send IQ error
 236                                 end
 237                         else -- user does not exist
 238                                 -- TODO we would get here for nodeless JIDs too. Do something fun maybe? Echo service? Let plugins use xmpp:server/resource addresses?
 239                                 if stanza.name == "presence" then
 240                                         if stanza.attr.type == "probe" then
 241                                                 origin.send(st.presence({from = to_bare, to = from_bare, type = "unsubscribed"}));
 242                                         end
 243                                         -- else ignore
 244                                 else
 245                                         origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
 246                                 end
 247                         end
 248                 end
 249         elseif origin.type == "c2s" then
 250                 -- Remote host
 251                 local xmlns = stanza.attr.xmlns;
 252                 --stanza.attr.xmlns = "jabber:server";
 253                 stanza.attr.xmlns = nil;
 254                 log("debug", "sending s2s stanza: %s", tostring(stanza));
 255                 send_s2s(origin.host, host, stanza); -- TODO handle remote routing errors
 256                 stanza.attr.xmlns = xmlns; -- reset
 257         elseif origin.type == "component" or origin.type == "local" then
 258                 -- Route via s2s for components and modules
 259                 log("debug", "Routing outgoing stanza for %s to %s", origin.host, host);
 260                 send_s2s(origin.host, host, stanza);
 261         else
 262                 log("warn", "received stanza from unhandled connection type: %s", origin.type);
 263         end
 264         stanza.attr.to = to; -- reset
 265 end