3 local sessions = sessions;
4 local socket = require "socket";
5 local format = string.format;
6 local t_insert, t_sort = table.insert, table.sort;
7 local get_traceback = debug.traceback;
8 local tostring, pairs, ipairs, getmetatable, print, newproxy, error, tonumber
9 = tostring, pairs, ipairs, getmetatable, print, newproxy, error, tonumber;
11 local connlisteners_get = require "net.connlisteners".get;
12 local wraptlsclient = require "net.server".wraptlsclient;
13 local modulemanager = require "core.modulemanager";
14 local st = require "stanza";
15 local stanza = st.stanza;
17 local uuid_gen = require "util.uuid".generate;
19 local logger_init = require "util.logger".init;
21 local log = logger_init("s2smanager");
23 local md5_hash = require "util.hashes".md5;
25 local dialback_secret = "This is very secret!!! Ha!";
27 local dns = require "net.dns";
31 local function compare_srv_priorities(a,b) return a.priority < b.priority or a.weight < b.weight; end
33 function send_to_host(from_host, to_host, data)
34 if data.name then data = tostring(data); end
35 local host = hosts[from_host].s2sout[to_host];
37 -- We have a connection to this host already
38 if host.type == "s2sout_unauthed" and ((not data.xmlns) or data.xmlns == "jabber:client" or data.xmlns == "jabber:server") then
39 (host.log or log)("debug", "trying to send over unauthed s2sout to "..to_host..", authing it now...");
40 if not host.notopen and not host.dialback_key then
41 host.log("debug", "dialback had not been initiated");
42 initiate_dialback(host);
45 -- Queue stanza until we are able to send it
46 if host.sendq then t_insert(host.sendq, data);
47 else host.sendq = { data }; end
48 elseif host.type == "local" or host.type == "component" then
49 log("error", "Trying to send a stanza to ourselves??")
50 log("error", "Traceback: %s", get_traceback());
51 log("error", "Stanza: %s", tostring(data));
53 (host.log or log)("debug", "going to send stanza to "..to_host.." from "..from_host);
55 if host.from_host ~= from_host then
56 log("error", "WARNING! This might, possibly, be a bug, but it might not...");
57 log("error", "We are going to send from %s instead of %s", tostring(host.from_host), tostring(from_host));
60 host.log("debug", "stanza sent over "..host.type);
63 log("debug", "opening a new outgoing connection for this stanza");
64 local host_session = new_outgoing(from_host, to_host);
66 host_session.sendq = { data };
70 local open_sessions = 0;
72 function new_incoming(conn)
73 local session = { conn = conn, type = "s2sin_unauthed", direction = "incoming" };
75 session.trace = newproxy(true);
76 getmetatable(session.trace).__gc = function () open_sessions = open_sessions - 1; print("s2s session got collected, now "..open_sessions.." s2s sessions are allocated") end;
78 open_sessions = open_sessions + 1;
79 local w, log = conn.write, logger_init("s2sin"..tostring(conn):match("[a-f0-9]+$"));
80 session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end
84 function new_outgoing(from_host, to_host)
85 local host_session = { to_host = to_host, from_host = from_host, notopen = true, type = "s2sout_unauthed", direction = "outgoing" };
86 hosts[from_host].s2sout[to_host] = host_session;
87 local cl = connlisteners_get("xmppserver");
89 local conn, handler = socket.tcp()
91 local connect_host, connect_port = to_host, 5269;
93 local answer = dns.lookup("_xmpp-server._tcp."..to_host..".", "SRV");
96 log("debug", to_host.." has SRV records, handling...");
98 host_session.srv_hosts = srv_hosts;
99 for _, record in ipairs(answer) do
100 t_insert(srv_hosts, record.srv);
102 t_sort(srv_hosts, compare_srv_priorities);
104 local srv_choice = srv_hosts[1];
106 connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port;
107 log("debug", "Best record found, will connect to %s:%d", connect_host, connect_port);
112 local success, err = conn:connect(connect_host, connect_port);
113 if not success and err ~= "timeout" then
114 log("warn", "s2s connect() failed: %s", err);
117 conn = wraptlsclient(cl, conn, connect_host, connect_port, 0, 1, hosts[from_host].ssl_ctx );
118 host_session.conn = conn;
120 -- Register this outgoing connection so that xmppserver_listener knows about it
121 -- otherwise it will assume it is a new incoming connection
122 cl.register_outgoing(conn, host_session);
126 local conn_name = "s2sout"..tostring(conn):match("[a-f0-9]*$");
127 log = logger_init(conn_name);
128 host_session.log = log;
131 local w = conn.write;
132 host_session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end
134 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));
139 function streamopened(session, attr)
140 local send = session.sends2s;
142 session.version = tonumber(attr.version) or 0;
143 if session.version >= 1.0 and not (attr.to and attr.from) then
144 --print("to: "..tostring(attr.to).." from: "..tostring(attr.from));
145 log("warn", (session.to_host or "(unknown)").." failed to specify 'to' or 'from' hostname as per RFC");
148 if session.direction == "incoming" then
149 -- Send a reply stream header
151 --for k,v in pairs(attr) do print("", tostring(k), ":::", tostring(v)); end
153 session.to_host = attr.to;
154 session.from_host = attr.from;
156 session.streamid = uuid_gen();
157 (session.log or log)("debug", "incoming s2s received <stream:stream>");
158 send("<?xml version='1.0'?>");
159 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 }):top_tag());
160 if session.to_host and not hosts[session.to_host] then
161 -- Attempting to connect to a host we don't serve
162 session:close("host-unknown");
165 if session.version >= 1.0 then
166 send(st.stanza("stream:features")
167 :tag("dialback", { xmlns='urn:xmpp:features:dialback' }):tag("optional"):up():up());
169 elseif session.direction == "outgoing" then
170 -- If we are just using the connection for verifying dialback keys, we won't try and auth it
171 if not attr.id then error("stream response did not give us a streamid!!!"); end
172 session.streamid = attr.id;
174 if not session.dialback_verifying then
175 initiate_dialback(session);
177 mark_connected(session);
181 session.notopen = nil;
184 function initiate_dialback(session)
185 -- generate dialback key
186 session.dialback_key = generate_dialback(session.streamid, session.to_host, session.from_host);
187 session.sends2s(format("<db:result from='%s' to='%s'>%s</db:result>", session.from_host, session.to_host, session.dialback_key));
188 session.log("info", "sent dialback key on outgoing s2s stream");
191 function generate_dialback(id, to, from)
192 return md5_hash(id..to..from..dialback_secret); -- FIXME: See XEP-185 and XEP-220
195 function verify_dialback(id, to, from, key)
196 return key == generate_dialback(id, to, from);
199 function make_authenticated(session)
200 if session.type == "s2sout_unauthed" then
201 session.type = "s2sout";
202 elseif session.type == "s2sin_unauthed" then
203 session.type = "s2sin";
207 session.log("info", "connection is now authenticated");
209 mark_connected(session);
214 function mark_connected(session)
215 local sendq, send = session.sendq, session.sends2s;
217 local from, to = session.from_host, session.to_host;
219 session.log("debug", session.direction.." s2s connection "..from.."->"..to.." is now complete");
221 local send_to_host = send_to_host;
222 function session.send(data) send_to_host(to, from, data); end
225 if session.direction == "outgoing" then
227 session.log("debug", "sending "..#sendq.." queued stanzas across new outgoing connection to "..session.to_host);
228 for i, data in ipairs(sendq) do
237 function destroy_session(session)
238 (session.log or log)("info", "Destroying "..tostring(session.direction).." session "..tostring(session.from_host).."->"..tostring(session.to_host));
240 -- FIXME: Flush sendq here/report errors to originators
242 if session.direction == "outgoing" then
243 hosts[session.from_host].s2sout[session.to_host] = nil;
246 for k in pairs(session) do