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prosody/core/stanza_router.lua

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-- Prosody IM v0.4
-- Copyright (C) 2008-2009 Matthew Wild
-- Copyright (C) 2008-2009 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
local log = require "util.logger".init("stanzarouter")
local st = require "util.stanza";
local send_s2s = require "core.s2smanager".send_to_host;
local user_exists = require "core.usermanager".user_exists;
local rostermanager = require "core.rostermanager";
local sessionmanager = require "core.sessionmanager";
local offlinemanager = require "core.offlinemanager";
local s2s_verify_dialback = require "core.s2smanager".verify_dialback;
local s2s_make_authenticated = require "core.s2smanager".make_authenticated;
local modules_handle_stanza = require "core.modulemanager".handle_stanza;
local component_handle_stanza = require "core.componentmanager".handle_stanza;
local handle_outbound_presence_subscriptions_and_probes = require "core.presencemanager".handle_outbound_presence_subscriptions_and_probes;
local handle_inbound_presence_subscriptions_and_probes = require "core.presencemanager".handle_inbound_presence_subscriptions_and_probes;
local handle_normal_presence = require "core.presencemanager".handle_normal_presence;
local format = string.format;
local tostring = tostring;
local t_concat = table.concat;
local t_insert = table.insert;
local tonumber = tonumber;
local s_find = string.find;
local pairs = pairs;
local ipairs = ipairs;
local jid_split = require "util.jid".split;
local jid_prepped_split = require "util.jid".prepped_split;
local print = print;
local function checked_error_reply(origin, stanza)
if (stanza.attr.xmlns == "jabber:client" or stanza.attr.xmlns == "jabber:server") and stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then
origin.send(st.error_reply(stanza, "cancel", "service-unavailable")); -- FIXME correct error?
end
end
function core_process_stanza(origin, stanza)
(origin.log or log)("debug", "Received[%s]: %s", origin.type, stanza:top_tag())
if not stanza.attr.xmlns then stanza.attr.xmlns = "jabber:client"; end -- FIXME Hack. This should be removed when we fix namespace handling.
-- TODO verify validity of stanza (as well as JID validity)
if stanza.attr.xmlns == "error" and #stanza.tags == 0 then return; end -- TODO invalid stanza, log
if stanza.name == "iq" then
if (stanza.attr.type == "set" or stanza.attr.type == "get") and #stanza.tags ~= 1 then
origin.send(st.error_reply(stanza, "modify", "bad-request"));
return;
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
-- TODO also, stanzas should be returned to their original state before the function ends
if origin.type == "c2s" then
stanza.attr.from = origin.full_jid;
end
local to, xmlns = stanza.attr.to, stanza.attr.xmlns;
local from = stanza.attr.from;
local node, host, resource;
local from_node, from_host, from_resource;
local to_bare, from_bare;
if to then
node, host, resource = jid_prepped_split(to);
if not host then
error("Invalid to JID");
end
to_bare = node and (node.."@"..host) or host; -- bare JID
if resource then to = to_bare.."/"..resource; else to = to_bare; end
stanza.attr.to = to;
end
if from then
from_node, from_host, from_resource = jid_prepped_split(from);
if not from_host then
error("Invalid from JID");
end
from_bare = from_node and (from_node.."@"..from_host) or from_host; -- bare JID
if from_resource then from = from_bare.."/"..from_resource; else from = from_bare; end
stanza.attr.from = from;
end
--[[if to and not(hosts[to]) and not(hosts[to_bare]) and (hosts[host] and hosts[host].type ~= "local") then -- not for us?
log("warn", "stanza recieved for a non-local server");
return; -- FIXME what should we do here?
end]] -- FIXME
-- FIXME do stanzas not of jabber:client get handled by components?
if (origin.type == "s2sin" or origin.type == "c2s" or origin.type == "component") and (not xmlns or xmlns == "jabber:server" or xmlns == "jabber:client") then
if origin.type == "s2sin" and not origin.dummy then
local host_status = origin.hosts[from_host];
if not host_status or not host_status.authed then -- remote server trying to impersonate some other server?
log("warn", "Received a stanza claiming to be from %s, over a conn authed for %s!", from_host, origin.from_host);
return; -- FIXME what should we do here? does this work with subdomains?
end
end
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 -- directed presence
origin.directed = origin.directed or {};
origin.directed[to] = true;
--t_insert(origin.directed, to); -- FIXME does it make more sense to add to_bare rather than to?
end
if not to then
core_handle_stanza(origin, stanza);
elseif hosts[to] and hosts[to].type == "local" then -- directed at a local server
core_handle_stanza(origin, stanza);
elseif stanza.attr.xmlns and stanza.attr.xmlns ~= "jabber:client" and stanza.attr.xmlns ~= "jabber:server" then
modules_handle_stanza(host or origin.host or origin.to_host, origin, stanza);
elseif hosts[to] and hosts[to].type == "component" then -- hack to allow components to handle node@server/resource and server/resource
component_handle_stanza(origin, stanza);
elseif hosts[to_bare] and hosts[to_bare].type == "component" then -- hack to allow components to handle node@server
component_handle_stanza(origin, stanza);
elseif hosts[host] and hosts[host].type == "component" then -- directed at a component
component_handle_stanza(origin, stanza);
elseif origin.type == "c2s" and stanza.name == "presence" and stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" then
handle_outbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza);
elseif hosts[host] and hosts[host].type == "local" and stanza.name == "iq" and not resource then -- directed at bare JID
core_handle_stanza(origin, stanza);
else
core_route_stanza(origin, stanza);
end
else
core_handle_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 modules_handle_stanza(select(2, jid_split(stanza.attr.to)) or origin.host, origin, stanza) then return; end
if origin.type == "c2s" or origin.type == "s2sin" then
if origin.type == "c2s" then
if stanza.name == "presence" and origin.roster then
if stanza.attr.type == nil or stanza.attr.type == "unavailable" then
handle_normal_presence(origin, stanza, core_route_stanza);
else
log("warn", "Unhandled c2s presence: %s", tostring(stanza));
checked_error_reply(origin, stanza);
end
else
log("warn", "Unhandled c2s stanza: %s", tostring(stanza));
checked_error_reply(origin, stanza);
end
else -- s2s stanzas
log("warn", "Unhandled s2s stanza: %s", tostring(stanza));
checked_error_reply(origin, stanza);
end
else
log("warn", "Unhandled %s stanza: %s", origin.type, tostring(stanza));
checked_error_reply(origin, stanza);
end
end
function core_route_stanza(origin, stanza)
-- Hooks
--- ...later
-- Deliver
local to = stanza.attr.to;
local node, host, resource = jid_split(to);
local to_bare = node and (node.."@"..host) or host; -- bare JID
local from = stanza.attr.from;
local from_node, from_host, from_resource = jid_split(from);
local from_bare = from_node and (from_node.."@"..from_host) or from_host; -- bare JID
-- Auto-detect origin if not specified
origin = origin or hosts[from_host];
if not origin then return false; end
if hosts[to] and hosts[to].type == "component" then -- hack to allow components to handle node@server/resource and server/resource
return component_handle_stanza(origin, stanza);
elseif hosts[to_bare] and hosts[to_bare].type == "component" then -- hack to allow components to handle node@server
return component_handle_stanza(origin, stanza);
elseif hosts[host] and hosts[host].type == "component" then -- directed at a component
return component_handle_stanza(origin, stanza);
end
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
handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza);
else -- sender is available or unavailable
for _, session in pairs(user.sessions) do -- presence broadcast to all user resources.
if session.full_jid then -- FIXME should this be just for available resources? Do we need to check subscription?
stanza.attr.to = session.full_jid; -- reset at the end of function
session.send(stanza);
end
end
end
elseif stanza.name == "message" then -- select a resource to recieve message
stanza.attr.to = to_bare;
if stanza.attr.type == 'headline' then
for _, session in pairs(user.sessions) do -- find resource with greatest priority
if session.presence and session.priority >= 0 then
session.send(stanza);
end
end
elseif resource and stanza.attr.type == 'groupchat' then
-- Groupchat message sent to offline resource
origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
else
local priority = 0;
local recipients = {};
for _, session in pairs(user.sessions) do -- find resource with greatest priority
if session.presence then
local p = session.priority;
if p > priority then
priority = p;
recipients = {session};
elseif p == priority then
t_insert(recipients, session);
end
end
end
local count = 0;
for _, session in ipairs(recipients) do
session.send(stanza);
count = count + 1;
end
if count == 0 and (stanza.attr.type == "chat" or stanza.attr.type == "normal" or not stanza.attr.type) then
offlinemanager.store(node, host, stanza);
-- TODO deal with storage errors
end
end
else
-- TODO send IQ error
end
else
-- User + resource is online...
stanza.attr.to = res.full_jid; -- reset at the end of function
res.send(stanza); -- Yay \o/
end
else
-- user not online
if user_exists(node, host) then
if stanza.name == "presence" then
if stanza.attr.type ~= nil and stanza.attr.type ~= "unavailable" then
handle_inbound_presence_subscriptions_and_probes(origin, stanza, from_bare, to_bare, core_route_stanza);
else
-- TODO send unavailable presence or unsubscribed
end
elseif stanza.name == "message" then -- FIXME if full jid, then send out to resources with highest priority
stanza.attr.to = to_bare; -- TODO not in RFC, but seems obvious. Should discuss on the mailing list.
if stanza.attr.type == "chat" or stanza.attr.type == "normal" or not stanza.attr.type then
offlinemanager.store(node, host, stanza);
-- FIXME don't store messages with only chat state notifications
elseif stanza.attr.type == "groupchat" then
local reply = st.error_reply(stanza, "cancel", "service-unavailable");
reply.attr.from = to;
origin.send(reply);
end
-- TODO allow configuration of offline storage
-- TODO send error if not storing offline
elseif stanza.name == "iq" and (stanza.attr.type == "get" or stanza.attr.type == "set") then
origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
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
local t = stanza.attr.type;
if t == "subscribe" or t == "probe" then
origin.send(st.presence({from = to_bare, to = from_bare, type = "unsubscribed"}));
end
-- else ignore
elseif stanza.attr.type ~= "error" and (stanza.name ~= "iq" or stanza.attr.type ~= "result") then
origin.send(st.error_reply(stanza, "cancel", "service-unavailable"));
end
end
end
elseif origin.type == "c2s" then
-- Remote host
local xmlns = stanza.attr.xmlns;
--stanza.attr.xmlns = "jabber:server";
stanza.attr.xmlns = nil;
log("debug", "sending s2s stanza: %s", tostring(stanza));
send_s2s(origin.host, host, stanza); -- TODO handle remote routing errors
stanza.attr.xmlns = xmlns; -- reset
elseif origin.type == "component" or origin.type == "local" then
-- Route via s2s for components and modules
log("debug", "Routing outgoing stanza for %s to %s", origin.host, host);
send_s2s(origin.host, host, stanza);
else
log("warn", "received stanza from unhandled connection type: %s", origin.type);
end
stanza.attr.to = to; -- reset
end
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