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-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
local hosts = _G.hosts;
local t_concat = table.concat;
local lxp = require "lxp";
local logger = require "util.logger";
local config = require "core.configmanager";
local connlisteners = require "net.connlisteners";
local cm_register_component = require "core.componentmanager".register_component;
local cm_deregister_component = require "core.componentmanager".deregister_component;
local uuid_gen = require "util.uuid".generate;
local jid_split = require "util.jid".split;
local sha1 = require "util.hashes".sha1;
local st = require "util.stanza";
local init_xmlhandlers = require "core.xmlhandlers";
local sessions = {};
local log = logger.init("componentlistener");
local component_listener = { default_port = 5347; default_mode = "*a"; default_interface = config.get("*", "core", "component_interface") or "127.0.0.1" };
local xmlns_component = 'jabber:component:accept';
--- Callbacks/data for xmlhandlers to handle streams for us ---
local stream_callbacks = { default_ns = xmlns_component };
local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";
function stream_callbacks.error(session, error, data, data2)
if session.destroyed then return; end
log("warn", "Error processing component stream: "..tostring(error));
if error == "no-stream" then
session:close("invalid-namespace");
elseif error == "parse-error" then
session.log("warn", "External component %s XML parse error: %s", tostring(session.host), tostring(data));
session:close("xml-not-well-formed");
elseif error == "stream-error" then
local condition, text = "undefined-condition";
for child in data:children() do
if child.attr.xmlns == xmlns_xmpp_streams then
if child.name ~= "text" then
condition = child.name;
else
text = child:get_text();
end
if condition ~= "undefined-condition" and text then
break;
end
end
end
text = condition .. (text and (" ("..text..")") or "");
session.log("info", "Session closed by remote with error: %s", text);
session:close(nil, text);
end
end
function stream_callbacks.streamopened(session, attr)
if config.get(attr.to, "core", "component_module") ~= "component" then
-- Trying to act as a component domain which
-- hasn't been configured
session:close{ condition = "host-unknown", text = tostring(attr.to).." does not match any configured external components" };
return;
end
-- Store the original host (this is used for config, etc.)
session.user = attr.to;
-- Set the host for future reference
session.host = config.get(attr.to, "core", "component_address") or attr.to;
-- Note that we don't create the internal component
-- until after the external component auths successfully
session.streamid = uuid_gen();
session.notopen = nil;
session.send(st.stanza("stream:stream", { xmlns=xmlns_component,
["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.host }):top_tag());
end
function stream_callbacks.streamclosed(session)
session.log("Received </stream:stream>");
session:close();
end
local core_process_stanza = core_process_stanza;
function stream_callbacks.handlestanza(session, stanza)
-- Namespaces are icky.
if not stanza.attr.xmlns and stanza.name == "handshake" then
stanza.attr.xmlns = xmlns_component;
end
if not stanza.attr.xmlns or stanza.attr.xmlns == "jabber:client" then
local from = stanza.attr.from;
if from then
if session.component_validate_from then
local _, domain = jid_split(stanza.attr.from);
if domain ~= session.host then
-- Return error
session.log("warn", "Component sent stanza with missing or invalid 'from' address");
session:close{
condition = "invalid-from";
text = "Component tried to send from address <"..tostring(from)
.."> which is not in domain <"..tostring(session.host)..">";
};
return;
end
end
else
stanza.attr.from = session.host;
end
if not stanza.attr.to then
session.log("warn", "Rejecting stanza with no 'to' address");
session.send(st.error_reply(stanza, "modify", "bad-request", "Components MUST specify a 'to' address on stanzas"));
return;
end
end
return core_process_stanza(session, stanza);
end
--- Closing a component connection
local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
local function session_close(session, reason)
if session.destroyed then return; end
local log = session.log or log;
if session.conn then
if session.notopen then
session.send("<?xml version='1.0'?>");
session.send(st.stanza("stream:stream", default_stream_attr):top_tag());
end
if reason then
if type(reason) == "string" then -- assume stream error
log("info", "Disconnecting component, <stream:error> is: %s", reason);
session.send(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
elseif type(reason) == "table" then
if reason.condition then
local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
if reason.text then
stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
end
if reason.extra then
stanza:add_child(reason.extra);
end
log("info", "Disconnecting component, <stream:error> is: %s", tostring(stanza));
session.send(stanza);
elseif reason.name then -- a stanza
log("info", "Disconnecting component, <stream:error> is: %s", tostring(reason));
session.send(reason);
end
end
end
session.send("</stream:stream>");
session.conn:close();
component_listener.ondisconnect(session.conn, "stream error");
end
end
--- Component connlistener
function component_listener.onincoming(conn, data)
local session = sessions[conn];
if not session then
local _send = conn.write;
session = { type = "component", conn = conn, send = function (data) return _send(conn, tostring(data)); end };
sessions[conn] = session;
-- Logging functions --
local conn_name = "jcp"..tostring(conn):match("[a-f0-9]+$");
session.log = logger.init(conn_name);
session.close = session_close;
session.log("info", "Incoming Jabber component connection");
local parser = lxp.new(init_xmlhandlers(session, stream_callbacks), "\1");
session.parser = parser;
session.notopen = true;
function session.data(conn, data)
local ok, err = parser:parse(data);
if ok then return; end
log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data, data:sub(1, 300):gsub("[\r\n]+", " "):gsub("[%z\1-\31]", "_"));
session:close("xml-not-well-formed");
end
session.dispatch_stanza = stream_callbacks.handlestanza;
end
if data then
session.data(conn, data);
end
end
function component_listener.ondisconnect(conn, err)
local session = sessions[conn];
if session then
(session.log or log)("info", "component disconnected: %s (%s)", tostring(session.host), tostring(err));
if session.host then
log("debug", "Deregistering component");
cm_deregister_component(session.host);
hosts[session.host].connected = nil;
end
sessions[conn] = nil;
for k in pairs(session) do
if k ~= "log" and k ~= "close" then
session[k] = nil;
end
end
session.destroyed = true;
session = nil;
end
end
connlisteners.register('xmppcomponent', component_listener);
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