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-- Prosody IM
-- 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 hosts = _G.hosts;
local tostring = tostring;
local st = require "util.stanza";
local send_s2s = require "core.s2smanager".send_to_host;
local modules_handle_stanza = require "core.modulemanager".handle_stanza;
local component_handle_stanza = require "core.componentmanager".handle_stanza;
local jid_split = require "util.jid".split;
local jid_prepped_split = require "util.jid".prepped_split;
function core_process_stanza(origin, stanza)
(origin.log or log)("debug", "Received[%s]: %s", origin.type, stanza:top_tag())
-- Currently we guarantee every stanza to have an xmlns, should we keep this rule?
if not stanza.attr.xmlns then stanza.attr.xmlns = "jabber:client"; end
-- TODO verify validity of stanza (as well as JID validity)
if stanza.attr.type == "error" and #stanza.tags == 0 then return; end -- TODO invalid stanza, log
if stanza.name == "iq" then
local can_reply = stanza.attr.type == "set" or stanza.attr.type == "get"
local missing_id = not stanza.attr.id;
if can_reply and (#stanza.tags ~= 1 or missing_id) then
origin.send(st.error_reply(stanza, "modify", "bad-request"));
return;
elseif missing_id then
return;
end
end
if origin.type == "c2s" then
if not origin.full_jid
and not(stanza.name == "iq" and stanza.attr.type == "set" and stanza.tags[1] and stanza.tags[1].name == "bind"
and stanza.tags[1].attr.xmlns == "urn:ietf:params:xml:ns:xmpp-bind") then
-- authenticated client isn't bound and current stanza is not a bind request
origin.send(st.error_reply(stanza, "auth", "not-authorized")); -- FIXME maybe allow stanzas to account or server
return;
end
-- TODO also, stanzas should be returned to their original state before the function ends
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
if full_sessions[to] or bare_sessions[to] or hosts[to] then
node, host = jid_split(to); -- TODO only the host is needed, optimize
else
node, host, resource = jid_prepped_split(to);
if not host then
log("warn", "Received stanza with invalid destination JID: %s", to);
if stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then
origin.send(st.error_reply(stanza, "modify", "jid-malformed", "The destination address is invalid: "..to));
end
return;
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
end
if from and not origin.full_jid then
-- We only stamp the 'from' on c2s stanzas, so we still need to check validity
from_node, from_host, from_resource = jid_prepped_split(from);
if not from_host then
log("warn", "Received stanza with invalid source JID: %s", from);
if stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then
origin.send(st.error_reply(stanza, "modify", "jid-malformed", "The source address is invalid: "..from));
end
return;
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
if (origin.type == "s2sin" or origin.type == "c2s" or origin.type == "component") and 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 stream authed for %s!", from_host, origin.from_host);
return; -- FIXME what should we do here? does this work with subdomains?
end
end
core_post_stanza(origin, stanza);
else
local h = hosts[stanza.attr.to or origin.host or origin.to_host];
if h then
local event;
if stanza.attr.xmlns == "jabber:client" then
if stanza.name == "iq" and (stanza.attr.type == "set" or stanza.attr.type == "get") then
event = "stanza/iq/"..stanza.tags[1].attr.xmlns..":"..stanza.tags[1].name;
else
event = "stanza/"..stanza.name;
end
else
event = "stanza/"..stanza.attr.xmlns..":"..stanza.name;
end
if h.events.fire_event(event, {origin = origin, stanza = stanza}) then return; end
end
if host and not hosts[host] then host = nil; end -- workaround for a Pidgin bug which sets 'to' to the SRV result
modules_handle_stanza(host or origin.host or origin.to_host, origin, stanza);
end
end
function core_post_stanza(origin, stanza)
local to = stanza.attr.to;
local node, host, resource = jid_split(to);
local to_bare = node and (node.."@"..host) or host; -- bare JID
local to_type;
if node then
if resource then
to_type = '/full';
else
to_type = '/bare';
if node == origin.username and host == origin.host then
stanza.attr.to = nil;
end
end
else
if host then
to_type = '/host';
else
to_type = '/bare';
end
end
local event_data = {origin=origin, stanza=stanza};
if origin.full_jid == stanza.attr.from then -- c2s connection
if hosts[origin.host].events.fire_event('pre-'..stanza.name..to_type, event_data) then return; end -- do preprocessing
end
local h = hosts[to_bare] or hosts[host or origin.host];
if h then
if h.events.fire_event(stanza.name..to_type, event_data) then return; end -- do processing
if h.type == "component" then
component_handle_stanza(origin, stanza);
return;
end
modules_handle_stanza(h.host, origin, stanza);
else
core_route_stanza(origin, stanza);
end
end
function core_route_stanza(origin, stanza)
local node, host, resource = jid_split(stanza.attr.to);
local from_node, from_host, from_resource = jid_split(stanza.attr.from);
-- Auto-detect origin if not specified
origin = origin or hosts[from_host];
if not origin then return false; end
if hosts[host] then
-- old stanza routing code removed
core_post_stanza(origin, stanza);
elseif origin.type == "c2s" then
-- Remote host
if not hosts[from_host] then
log("error", "No hosts[from_host] (please report): %s", tostring(stanza));
end
if (not hosts[from_host]) or (not hosts[from_host].disallow_s2s) then
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
else
core_route_stanza(hosts[from_host], st.error_reply(stanza, "cancel", "not-allowed", "Communication with remote servers is not allowed"));
end
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", from_host, host);
send_s2s(from_host, host, stanza);
else
log("warn", "received stanza from unhandled connection type: %s", origin.type);
end
end
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