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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.
--
module:set_global();
local add_task = require "util.timer".add_task;
local new_xmpp_stream = require "util.xmppstream".new;
local nameprep = require "util.encodings".stringprep.nameprep;
local portmanager = require "core.portmanager";
local sessionmanager = require "core.sessionmanager";
local st = require "util.stanza";
local sm_new_session, sm_destroy_session = sessionmanager.new_session, sessionmanager.destroy_session;
local uuid_generate = require "util.uuid".generate;
local xpcall, tostring, type = xpcall, tostring, type;
local format = string.format;
local traceback = debug.traceback;
local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";
local log = module._log;
local c2s_timeout = module:get_option_number("c2s_timeout");
local opt_keepalives = module:get_option_boolean("tcp_keepalives", false);
local sessions = module:shared("sessions");
local stream_callbacks = { default_ns = "jabber:client", handlestanza = core_process_stanza };
local listener = {};
--- Stream events handlers
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 = "" };
function stream_callbacks.streamopened(session, attr)
local send = session.send;
session.host = nameprep(attr.to);
if not session.host then
session:close{ condition = "improper-addressing",
text = "A valid 'to' attribute is required on stream headers" };
return;
end
session.version = tonumber(attr.version) or 0;
session.streamid = uuid_generate();
(session.log or session)("debug", "Client sent opening <stream:stream> to %s", session.host);
if not hosts[session.host] then
-- We don't serve this host...
session:close{ condition = "host-unknown", text = "This server does not serve "..tostring(session.host)};
return;
end
send("<?xml version='1.0'?>");
send(format("<stream:stream xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' id='%s' from='%s' version='1.0' xml:lang='en'>", session.streamid, session.host));
(session.log or log)("debug", "Sent reply <stream:stream> to client");
session.notopen = nil;
-- If session.secure is *false* (not nil) then it means we /were/ encrypting
-- since we now have a new stream header, session is secured
if session.secure == false then
session.secure = true;
end
local features = st.stanza("stream:features");
hosts[session.host].events.fire_event("stream-features", { origin = session, features = features });
module:fire_event("stream-features", session, features);
send(features);
end
function stream_callbacks.streamclosed(session)
session.log("debug", "Received </stream:stream>");
session:close();
end
function stream_callbacks.error(session, error, data)
if error == "no-stream" then
session.log("debug", "Invalid opening stream header");
session:close("invalid-namespace");
elseif error == "parse-error" then
(session.log or log)("debug", "Client XML parse error: %s", tostring(data));
session:close("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
local function handleerr(err) log("error", "Traceback[c2s]: %s: %s", tostring(err), traceback()); end
function stream_callbacks.handlestanza(session, stanza)
stanza = session.filter("stanzas/in", stanza);
if stanza then
return xpcall(function () return core_process_stanza(session, stanza) end, handleerr);
end
end
--- Session methods
local function session_close(session, reason)
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 client, <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 client, <stream:error> is: %s", tostring(stanza));
session.send(stanza);
elseif reason.name then -- a stanza
log("info", "Disconnecting client, <stream:error> is: %s", tostring(reason));
session.send(reason);
end
end
end
session.send("</stream:stream>");
session.conn:close();
listener.ondisconnect(session.conn, (reason and (reason.text or reason.condition)) or reason or "session closed");
end
end
--- Port listener
function listener.onconnect(conn)
local session = sm_new_session(conn);
sessions[conn] = session;
session.log("info", "Client connected");
-- Client is using legacy SSL (otherwise mod_tls sets this flag)
if conn:ssl() then
session.secure = true;
end
if opt_keepalives then
conn:setoption("keepalive", opt_keepalives);
end
session.close = session_close;
local stream = new_xmpp_stream(session, stream_callbacks);
session.stream = stream;
session.notopen = true;
function session.reset_stream()
session.notopen = true;
session.stream:reset();
end
local filter = session.filter;
function session.data(data)
data = filter("bytes/in", data);
if data then
local ok, err = stream:feed(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("not-well-formed");
end
end
if c2s_timeout then
add_task(c2s_timeout, function ()
if session.type == "c2s_unauthed" then
session:close("connection-timeout");
end
end);
end
session.dispatch_stanza = stream_callbacks.handlestanza;
end
function listener.onincoming(conn, data)
local session = sessions[conn];
if session then
session.data(data);
end
end
function listener.ondisconnect(conn, err)
local session = sessions[conn];
if session then
(session.log or log)("info", "Client disconnected: %s", err);
sm_destroy_session(session, err);
sessions[conn] = nil;
session = nil;
end
end
function listener.associate_session(conn, session)
sessions[conn] = session;
end
module:add_item("net-provider", {
name = "c2s";
listener = listener;
default_port = 5222;
encryption = "starttls";
});
module:add_item("net-provider", {
name = "legacy_ssl";
listener = listener;
encryption = "ssl";
multiplex = {
pattern = "^<.*:stream.*%sxmlns%s*=%s*(['\"])jabber:client%1.*>";
};
});
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