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local hosts = hosts;
local sessions = sessions;
local socket = require "socket";
local format = string.format;
local t_insert = table.insert;
local tostring, pairs, ipairs, getmetatable, print, newproxy, error, tonumber
= tostring, pairs, ipairs, getmetatable, print, newproxy, error, tonumber;
local connlisteners_get = require "net.connlisteners".get;
local wraptlsclient = require "net.server".wraptlsclient;
local modulemanager = require "core.modulemanager";
local st = require "stanza";
local stanza = st.stanza;
local uuid_gen = require "util.uuid".generate;
local logger_init = require "util.logger".init;
local log = logger_init("s2smanager");
local md5_hash = require "util.hashes".md5;
local dialback_secret = "This is very secret!!! Ha!";
local srvmap = { ["gmail.com"] = "talk.google.com", ["identi.ca"] = "longlance.controlezvous.ca", ["cdr.se"] = "jabber.cdr.se" };
module "s2smanager"
function connect_host(from_host, to_host)
end
function send_to_host(from_host, to_host, data)
local host = hosts[to_host];
if host then
-- We have a connection to this host already
if host.type == "s2sout_unauthed" then
host.log("debug", "trying to send over unauthed s2sout to "..to_host..", authing it now...");
if not host.notopen and not host.dialback_key then
host.log("debug", "dialback had not been initiated");
initiate_dialback(host);
end
-- Queue stanza until we are able to send it
if host.sendq then t_insert(host.sendq, data);
else host.sendq = { data }; end
else
host.log("debug", "going to send stanza to "..to_host.." from "..from_host);
-- FIXME
if hosts[to_host].from_host ~= from_host then log("error", "WARNING! This might, possibly, be a bug, but it might not..."); end
hosts[to_host].sends2s(data);
host.log("debug", "stanza sent over "..hosts[to_host].type);
end
else
log("debug", "opening a new outgoing connection for this stanza");
local host_session = new_outgoing(from_host, to_host);
-- Store in buffer
host_session.sendq = { data };
end
end
function disconnect_host(host)
end
local open_sessions = 0;
function new_incoming(conn)
local session = { conn = conn, type = "s2sin_unauthed", direction = "incoming" };
if true then
session.trace = newproxy(true);
getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; print("s2s session got collected, now "..open_sessions.." s2s sessions are allocated") end;
end
open_sessions = open_sessions + 1;
local w = conn.write;
session.sends2s = function (t) w(tostring(t)); end
return session;
end
function new_outgoing(from_host, to_host)
local host_session = { to_host = to_host, from_host = from_host, notopen = true, type = "s2sout_unauthed", direction = "outgoing" };
hosts[to_host] = host_session;
local cl = connlisteners_get("xmppserver");
local conn, handler = socket.tcp()
--FIXME: Below parameters (ports/ip) are incorrect (use SRV)
to_host = srvmap[to_host] or to_host;
conn:settimeout(0);
local success, err = conn:connect(to_host, 5269);
if not success then
log("warn", "s2s connect() failed: %s", err);
end
conn = wraptlsclient(cl, conn, to_host, 5269, 0, 1, hosts[from_host].ssl_ctx );
host_session.conn = conn;
-- Register this outgoing connection so that xmppserver_listener knows about it
-- otherwise it will assume it is a new incoming connection
cl.register_outgoing(conn, host_session);
do
local conn_name = "s2sout"..tostring(conn):match("[a-f0-9]*$");
host_session.log = logger_init(conn_name);
end
local w = conn.write;
host_session.sends2s = function (t) w(tostring(t)); end
conn.write(format([[<stream:stream xmlns='jabber:server' xmlns:db='jabber:server:dialback' xmlns:stream='http://etherx.jabber.org/streams' from='%s' to='%s' version='1.0'>]], from_host, to_host));
return host_session;
end
function streamopened(session, attr)
session.log("debug", "s2s stream opened");
local send = session.sends2s;
session.version = tonumber(attr.version) or 0;
if session.version >= 1.0 and not (attr.to and attr.from) then
print("to: "..tostring(attr.to).." from: "..tostring(attr.from));
--error(session.to_host.." failed to specify 'to' or 'from' hostname as per RFC");
log("warn", (session.to_host or "(unknown)").." failed to specify 'to' or 'from' hostname as per RFC");
end
if session.direction == "incoming" then
-- Send a reply stream header
for k,v in pairs(attr) do print("", tostring(k), ":::", tostring(v)); end
session.to_host = attr.to;
session.from_host = attr.from;
session.streamid = uuid_gen();
print(session, session.from_host, "incoming s2s stream opened");
send("<?xml version='1.0'?>");
send(stanza("stream:stream", { xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback', ["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.to_host }));
elseif session.direction == "outgoing" then
-- If we are just using the connection for verifying dialback keys, we won't try and auth it
if not attr.id then error("stream response did not give us a streamid!!!"); end
session.streamid = attr.id;
if not session.dialback_verifying then
initiate_dialback(session);
else
mark_connected(session);
end
end
--[[
local features = {};
modulemanager.fire_event("stream-features-s2s", session, features);
send("<stream:features>");
for _, feature in ipairs(features) do
send(tostring(feature));
end
send("</stream:features>");]]
log("info", "s2s stream opened successfully");
session.notopen = nil;
end
function initiate_dialback(session)
-- generate dialback key
session.dialback_key = generate_dialback(session.streamid, session.to_host, session.from_host);
session.sends2s(format("<db:result from='%s' to='%s'>%s</db:result>", session.from_host, session.to_host, session.dialback_key));
session.log("info", "sent dialback key on outgoing s2s stream");
end
function generate_dialback(id, to, from)
return md5_hash(id..to..from..dialback_secret); -- FIXME: See XEP-185 and XEP-220
end
function verify_dialback(id, to, from, key)
return key == generate_dialback(id, to, from);
end
function make_authenticated(session)
if session.type == "s2sout_unauthed" then
session.type = "s2sout";
elseif session.type == "s2sin_unauthed" then
session.type = "s2sin";
else
return false;
end
session.log("info", "connection is now authenticated");
mark_connected(session);
return true;
end
function mark_connected(session)
local sendq, send = session.sendq, session.sends2s;
local from, to = session.from_host, session.to_host;
session.log("debug", session.direction.." s2s connection "..from.."->"..to.." is now complete");
local send_to_host = send_to_host;
function session.send(data) send_to_host(to, from, data); end
if session.direction == "outgoing" then
if sendq then
session.log("debug", "sending queued stanzas across new outgoing connection to "..session.to_host);
for i, data in ipairs(sendq) do
send(data);
sendq[i] = nil;
end
session.sendq = nil;
end
end
end
function destroy_session(session)
(session.log or log)("info", "Destroying "..tostring(session.direction).." session "..tostring(session.from_host).."->"..tostring(session.to_host));
if session.direction == "outgoing" then
hosts[session.to_host] = nil;
end
session.conn = nil;
session.disconnect = nil;
for k in pairs(session) do
if k ~= "trace" then
session[k] = nil;
end
end
end
return _M;
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