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-- The code in this file should be self-explanatory, though the logic is horrible
-- for more info on that, see doc/stanza_routing.txt, which attempts to condense
-- the rules from the RFCs (mainly 3921)
require "core.servermanager"
local log = require "util.logger".init("stanzarouter")
local st = require "util.stanza";
local send = require "core.sessionmanager".send_to_session;
-- local send_s2s = require "core.s2smanager".send_to_host;
local user_exists = require "core.usermanager".user_exists;
local jid_split = require "util.jid".split;
local print, debug = print, debug;
function core_process_stanza(origin, stanza)
log("debug", "Received: "..tostring(stanza))
-- TODO verify validity of stanza (as well as JID validity)
if stanza.name == "iq" and not(#stanza.tags == 1 and stanza.tags[1].attr.xmlns) then
if stanza.attr.type == "set" or stanza.attr.type == "get" then
error("Invalid IQ");
elseif #stanza.tags > 1 or not(stanza.attr.type == "error" or stanza.attr.type == "result") then
error("Invalid IQ");
end
end
if origin.type == "c2s" and not origin.full_jid
and not(stanza.name == "iq" and stanza.tags[1].name == "bind"
and stanza.tags[1].attr.xmlns == "urn:ietf:params:xml:ns:xmpp-bind") then
error("Client MUST bind resource after auth");
end
local to = stanza.attr.to;
stanza.attr.from = origin.full_jid; -- quick fix to prevent impersonation (FIXME this would be incorrect when the origin is not c2s)
-- TODO also, stazas should be returned to their original state before the function ends
-- TODO presence subscriptions
if not to then
core_handle_stanza(origin, stanza);
elseif hosts[to] and hosts[to].type == "local" then
core_handle_stanza(origin, stanza);
elseif stanza.name == "iq" and not select(3, jid_split(to)) then
core_handle_stanza(origin, stanza);
elseif origin.type == "c2s" then
core_route_stanza(origin, stanza);
end
end
-- This function handles stanzas which are not routed any further,
-- that is, they are handled by this server
function core_handle_stanza(origin, stanza)
-- Handlers
if origin.type == "c2s" or origin.type == "c2s_unauthed" then
local session = origin;
if stanza.name == "presence" and origin.roster then
if stanza.attr.type == nil or stanza.attr.type == "available" or stanza.attr.type == "unavailable" then
for jid in pairs(origin.roster) do -- broadcast to all interested contacts
local subscription = origin.roster[jid].subscription;
if subscription == "both" or subscription == "from" then
stanza.attr.to = jid;
core_route_stanza(origin, stanza);
end
end
local node, host = jid_split(stanza.attr.from);
for _, res in pairs(hosts[host].sessions[node].sessions) do -- broadcast to all resources and from resources
if res ~= origin then
if res.full_jid then -- to resource. FIXME is this check correct? Maybe it should be res.presence
stanza.attr.to = res.full_jid;
core_route_stanza(origin, stanza);
end
if res.presence then -- from all resources for which we have presence
res.presence.attr.to = origin.full_jid;
core_route_stanza(res, res.presence);
res.presence.attr.to = nil;
end
end
end
if not origin.presence then -- presence probes on initial presence
local probe = st.presence({from = origin.full_jid, type = "probe"});
for jid in pairs(origin.roster) do
local subscription = origin.roster[jid].subscription;
if subscription == "both" or subscription == "to" then
probe.attr.to = jid;
core_route_stanza(origin, probe);
end
end
-- TODO resend subscription requests
end
origin.presence = stanza;
stanza.attr.to = nil; -- reset it
else
-- TODO error, bad type
end
else
log("debug", "Routing stanza to local");
handle_stanza(session, stanza);
end
end
end
function is_authorized_to_see_presence(origin, username, host)
local roster = datamanager.load(username, host, "roster") or {};
local item = roster[origin.username.."@"..origin.host];
return item and (item.subscription == "both" or item.subscription == "from");
end
function core_route_stanza(origin, stanza)
-- Hooks
--- ...later
-- Deliver
local to = stanza.attr.to;
local node, host, resource = jid_split(to);
if stanza.name == "presence" and (stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable") then resource = nil; end
local host_session = hosts[host]
if host_session and host_session.type == "local" then
-- Local host
local user = host_session.sessions[node];
if user then
local res = user.sessions[resource];
if not res then
-- if we get here, resource was not specified or was unavailable
if stanza.name == "presence" then
if stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" then
if stanza.attr.type == "probe" then
if is_authorized_to_see_presence(origin, node, host) then
for k in pairs(user.sessions) do -- return presence for all resources
if user.sessions[k].presence then
local pres = user.sessions[k].presence;
pres.attr.to = origin.full_jid;
pres.attr.from = user.sessions[k].full_jid;
send(origin, pres);
pres.attr.to = nil;
pres.attr.from = nil;
end
end
else
send(origin, st.presence({from=user.."@"..host, to=origin.username.."@"..origin.host, type="unsubscribed"}));
end
elseif stanza.attr.type == "subscribe" then
-- TODO
elseif stanza.attr.type == "unsubscribe" then
-- TODO
elseif stanza.attr.type == "subscribed" then
-- TODO
elseif stanza.attr.type == "unsubscribed" then
-- TODO
end -- discard any other type
else -- sender is available or unavailable
for k in pairs(user.sessions) do -- presence broadcast to all user resources
if user.sessions[k].full_jid then
stanza.attr.to = user.sessions[k].full_jid;
send(user.sessions[k], stanza);
end
end
end
elseif stanza.name == "message" then -- select a resource to recieve message
for k in pairs(user.sessions) do
if user.sessions[k].full_jid then
res = user.sessions[k];
break;
end
end
-- TODO find resource with greatest priority
send(res, stanza);
else
-- TODO send IQ error
end
else
-- User + resource is online...
stanza.attr.to = res.full_jid;
send(res, stanza); -- Yay \o/
end
else
-- user not online
if user_exists(node, host) then
if stanza.name == "presence" then
if stanza.attr.type == "probe" and is_authorized_to_see_presence(origin, node, host) then -- FIXME what to do for not c2s?
-- TODO send last recieved unavailable presence
else
-- TODO send unavailable presence
end
elseif stanza.name == "message" then
-- TODO send message error, or store offline messages
elseif stanza.name == "iq" then
-- TODO send IQ error
end
else -- user does not exist
-- TODO we would get here for nodeless JIDs too. Do something fun maybe? Echo service? Let plugins use xmpp:server/resource addresses?
if stanza.name == "presence" then
if stanza.attr.type == "probe" then
send(origin, st.presence({from = user.."@"..host, to = origin.username.."@"..origin.host, type = "unsubscribed"}));
end
-- else ignore
else
send(origin, st.error_reply(stanza, "cancel", "service-unavailable"));
end
end
end
else
-- Remote host
if host_session then
-- Send to session
else
-- Need to establish the connection
end
end
stanza.attr.to = to; -- reset
end
function handle_stanza_toremote(stanza)
log("error", "Stanza bound for remote host, but s2s is not implemented");
end
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