--- Prosody IM v0.4
+-- Prosody IM
-- Copyright (C) 2008-2009 Matthew Wild
-- Copyright (C) 2008-2009 Waqas Hussain
--
local hosts = hosts;
local sessions = sessions;
local core_process_stanza = function(a, b) core_process_stanza(a, b); end
+local add_task = require "util.timer".add_task;
local socket = require "socket";
local format = string.format;
local t_insert, t_sort = table.insert, table.sort;
local sha256_hash = require "util.hashes".sha256;
-local dialback_secret = sha256_hash(tostring{} .. math.random() .. socket.gettime(), true);
+local dialback_secret = uuid_gen();
-local adns = require "net.adns";
+local adns, dns = require "net.adns", require "net.dns";
+
+local connect_timeout = config.get("*", "core", "s2s_timeout") or 60;
+local dns_timeout = config.get("*", "core", "dns_timeout") or 60;
+local max_dns_depth = config.get("*", "core", "dns_max_depth") or 3;
incoming_s2s = {};
local incoming_s2s = incoming_s2s;
local function bounce_sendq(session)
local sendq = session.sendq;
if sendq then
- session.log("debug", "sending error replies for "..#sendq.." queued stanzas because of failed outgoing connection to "..tostring(session.to_host));
+ session.log("info", "sending error replies for "..#sendq.." queued stanzas because of failed outgoing connection to "..tostring(session.to_host));
local dummy = {
type = "s2sin";
send = function(s)
-- We have a connection to this host already
if host.type == "s2sout_unauthed" and data.name ~= "db:verify" and ((not data.xmlns) or data.xmlns == "jabber:client" or data.xmlns == "jabber:server") then
(host.log or log)("debug", "trying to send over unauthed s2sout to "..to_host);
- if not host.notopen and not host.dialback_key then
+ if not host.notopen and not host.dialback_key and host.sends2s then
host.log("debug", "dialback had not been initiated");
initiate_dialback(host);
end
local host_session = new_outgoing(from_host, to_host);
-- Store in buffer
host_session.sendq = { {tostring(data), st.reply(data)} };
- if (not host_session.connecting) and (not host_session.conn) then destroy_session(host_session); end
+ log("debug", "stanza [%s] queued until connection complete", tostring(data.name));
+ if (not host_session.connecting) and (not host_session.conn) then
+ log("warn", "Connection to %s failed already, destroying session...", to_host);
+ destroy_session(host_session);
+ end
end
end
end
open_sessions = open_sessions + 1;
local w, log = conn.write, logger_init("s2sin"..tostring(conn):match("[a-f0-9]+$"));
+ session.log = log;
session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end
incoming_s2s[session] = true;
+ add_task(connect_timeout, function ()
+ if session.conn ~= conn or
+ session.type == "s2sin" then
+ return; -- Ok, we're connect[ed|ing]
+ end
+ -- Not connected, need to close session and clean up
+ (session.log or log)("warn", "Destroying incomplete session %s->%s due to inactivity",
+ session.from_host or "(unknown)", session.to_host or "(unknown)");
+ session:close("connection-timeout");
+ end);
return session;
end
host_session.log = log;
end
+ -- This is the first call, can't fail (the first step is DNS lookup)
attempt_connection(host_session);
+ if not host_session.sends2s then
+ -- A sends2s which buffers data (until the stream is opened)
+ -- note that data in this buffer will be sent before the stream is authed
+ -- and will not be ack'd in any way, successful or otherwise
+ local buffer;
+ function host_session.sends2s(data)
+ if not buffer then
+ buffer = {};
+ host_session.send_buffer = buffer;
+ end
+ log("debug", "Buffering data on unconnected s2sout to %s", to_host);
+ buffer[#buffer+1] = data;
+ log("debug", "Buffered item %d: %s", #buffer, tostring(data));
+ end
+
+ end
+
return host_session;
end
local connect_host, connect_port = idna_to_ascii(to_host), 5269;
if not err then -- This is our first attempt
+ log("debug", "First attempt to connect to %s, starting with SRV lookup...", to_host);
host_session.connecting = true;
- local answer =
- adns.lookup(function (answer)
+ local handle;
+ handle = adns.lookup(function (answer)
+ handle = nil;
host_session.connecting = nil;
if answer then
log("debug", to_host.." has SRV records, handling...");
log("debug", to_host.." has no SRV records, falling back to A");
end
-- Try with SRV, or just the plain hostname if no SRV
- return try_connect(host_session, connect_host, connect_port);
+ local ok, err = try_connect(host_session, connect_host, connect_port);
+ if not ok then
+ if not attempt_connection(host_session, err) then
+ -- No more attempts will be made
+ destroy_session(host_session);
+ end
+ end
end, "_xmpp-server._tcp."..connect_host..".", "SRV");
+
+ -- Set handler for DNS timeout
+ add_task(dns_timeout, function ()
+ if handle then
+ adns.cancel(handle, true);
+ end
+ end);
+
+ log("debug", "DNS lookup for %s sent, waiting for response before we can connect", to_host);
return true; -- Attempt in progress
elseif host_session.srv_hosts and #host_session.srv_hosts > host_session.srv_choice then -- Not our first attempt, and we also have SRV
host_session.srv_choice = host_session.srv_choice + 1;
local srv_choice = host_session.srv_hosts[host_session.srv_choice];
connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port;
- host_session.log("debug", "Connection failed (%s). Attempt #%d: This time to %s:%d", tostring(err), host_session.srv_choice, connect_host, connect_port);
+ host_session.log("info", "Connection failed (%s). Attempt #%d: This time to %s:%d", tostring(err), host_session.srv_choice, connect_host, connect_port);
else
- host_session.log("debug", "Out of connection options, can't connect to %s", tostring(host_session.to_host));
+ host_session.log("info", "Out of connection options, can't connect to %s", tostring(host_session.to_host));
-- We're out of options
return false;
end
if not (connect_host and connect_port) then
-- Likely we couldn't resolve DNS
+ log("warn", "Hmm, we're without a host (%s) and port (%s) to connect to for %s, giving up :(", tostring(connect_host), tostring(connect_port), tostring(to_host));
return false;
end
end
function try_connect(host_session, connect_host, connect_port)
- log("debug", "Beginning new connection attempt to %s (%s:%d)", host_session.to_host, connect_host, connect_port);
+ host_session.connecting = true;
+ local handle;
+ handle = adns.lookup(function (reply)
+ handle = nil;
+ host_session.connecting = nil;
+
+ -- COMPAT: This is a compromise for all you CNAME-(ab)users :)
+ if not (reply and reply[#reply] and reply[#reply].a) then
+ local count = max_dns_depth;
+ reply = dns.peek(connect_host, "CNAME", "IN");
+ while count > 0 and reply and reply[#reply] and not reply[#reply].a and reply[#reply].cname do
+ log("debug", "Looking up %s (DNS depth is %d)", tostring(reply[#reply].cname), count);
+ reply = dns.peek(reply[#reply].cname, "A", "IN") or dns.peek(reply[#reply].cname, "CNAME", "IN");
+ count = count - 1;
+ end
+ end
+ -- end of CNAME resolving
+
+ if reply and reply[#reply] and reply[#reply].a then
+ log("debug", "DNS reply for %s gives us %s", connect_host, reply[#reply].a);
+ return make_connect(host_session, reply[#reply].a, connect_port);
+ else
+ log("debug", "DNS lookup failed to get a response for %s", connect_host);
+ if not attempt_connection(host_session, "name resolution failed") then -- Retry if we can
+ log("debug", "No other records to try for %s - destroying", host_session.to_host);
+ destroy_session(host_session); -- End of the line, we can't
+ end
+ end
+ end, connect_host, "A", "IN");
+
+ -- Set handler for DNS timeout
+ add_task(dns_timeout, function ()
+ if handle then
+ adns.cancel(handle, true);
+ end
+ end);
+
+ return true;
+end
+
+function make_connect(host_session, connect_host, connect_port)
+ host_session.log("info", "Beginning new connection attempt to %s (%s:%d)", host_session.to_host, connect_host, connect_port);
-- Ok, we're going to try to connect
local from_host, to_host = host_session.from_host, host_session.to_host;
conn:settimeout(0);
local success, err = conn:connect(connect_host, connect_port);
if not success and err ~= "timeout" then
- log("warn", "s2s connect() failed: %s", err);
- return false;
+ log("warn", "s2s connect() to %s (%s:%d) failed: %s", host_session.to_host, connect_host, connect_port, err);
+ return false, err;
end
local cl = connlisteners_get("xmppserver");
local w = conn.write;
host_session.sends2s = function (t) log("debug", "sending: %s", tostring(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));
+ 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' xml:lang='en'>]], from_host, to_host));
log("debug", "Connection attempt in progress...");
+ add_task(connect_timeout, function ()
+ if host_session.conn ~= conn or
+ host_session.type == "s2sout" or
+ host_session.connecting then
+ return; -- Ok, we're connect[ed|ing]
+ end
+ -- Not connected, need to close session and clean up
+ (host_session.log or log)("warn", "Destroying incomplete session %s->%s due to inactivity",
+ host_session.from_host or "(unknown)", host_session.to_host or "(unknown)");
+ host_session:close("connection-timeout");
+ end);
return true;
end
if not attr.id then error("stream response did not give us a streamid!!!"); end
session.streamid = attr.id;
+ -- Send unauthed buffer
+ -- (stanzas which are fine to send before dialback)
+ -- Note that this is *not* the stanza queue (which
+ -- we can only send if auth succeeds) :)
+ local send_buffer = session.send_buffer;
+ if send_buffer and #send_buffer > 0 then
+ log("debug", "Sending s2s send_buffer now...");
+ for i, data in ipairs(send_buffer) do
+ session.sends2s(tostring(data));
+ send_buffer[i] = nil;
+ end
+ end
+ session.send_buffer = nil;
+
if not session.dialback_verifying then
initiate_dialback(session);
else
end
function streamclosed(session)
- session.sends2s("</stream:stream>");
+ (session.log or log)("debug", "</stream:stream>");
+ if session.sends2s then
+ session.sends2s("</stream:stream>");
+ end
session.notopen = true;
end
else
return false;
end
- session.log("info", "connection is now authenticated");
+ session.log("debug", "connection %s->%s is now authenticated", session.from_host or "(unknown)", session.to_host or "(unknown)");
mark_connected(session);
local from, to = session.from_host, session.to_host;
- session.log("debug", session.direction.." s2s connection "..from.."->"..to.." is now complete");
+ session.log("info", session.direction.." s2s connection "..from.."->"..to.." complete");
local send_to_host = send_to_host;
function session.send(data) send_to_host(to, from, data); end
end
session.sendq = nil;
end
+
+ session.srv_hosts = nil;
end
end
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