-- 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 initialize_filters = require "util.filters".initialize;
local idna_to_ascii = require "util.encodings".idna.to_ascii;
local new_ip = require "util.ip".new_ip;
-local rfc3484_dest = require "util.rfc3484".destination;
+local rfc6724_dest = require "util.rfc6724".destination;
local socket = require "socket";
local adns = require "net.adns";
local dns = require "net.dns";
local t_insert, t_sort, ipairs = table.insert, table.sort, ipairs;
-local st = require "util.stanza";
+local local_addresses = require "util.net".local_addresses;
local s2s_destroy_session = require "core.s2smanager".destroy_session;
local log = module._log;
local sources = {};
+local has_ipv4, has_ipv6;
local dns_timeout = module:get_option_number("dns_timeout", 15);
dns.settimeout(dns_timeout);
return a.priority < b.priority or (a.priority == b.priority and a.weight > b.weight);
end
-local function session_open_stream(session, from, to)
- session.sends2s(st.stanza("stream:stream", {
- xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback',
- ["xmlns:stream"]='http://etherx.jabber.org/streams',
- from=from, to=to, version='1.0', ["xml:lang"]='en'}):top_tag());
-end
-
function s2sout.initiate_connection(host_session)
initialize_filters(host_session);
- host_session.open_stream = session_open_stream;
-
+ host_session.version = 1;
+
-- Kick the connection attempting machine into life
if not s2sout.attempt_connection(host_session) then
-- Intentionally not returning here, the
-- session is needed, connected or not
s2s_destroy_session(host_session);
end
-
+
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
end
function s2sout.attempt_connection(host_session, err)
- local from_host, to_host = host_session.from_host, host_session.to_host;
+ local to_host = host_session.to_host;
local connect_host, connect_port = to_host and idna_to_ascii(to_host), 5269;
-
+
if not connect_host then
return false;
end
-
+
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;
handle = adns.lookup(function (answer)
handle = nil;
host_session.connecting = nil;
- if answer then
- log("debug", to_host.." has SRV records, handling...");
- local srv_hosts = {};
+ if answer and #answer > 0 then
+ log("debug", "%s has SRV records, handling...", to_host);
+ local srv_hosts = { answer = answer };
host_session.srv_hosts = srv_hosts;
for _, record in ipairs(answer) do
t_insert(srv_hosts, record.srv);
end
if #srv_hosts == 1 and srv_hosts[1].target == "." then
- log("debug", to_host.." does not provide a XMPP service");
+ log("debug", "%s does not provide a XMPP service", to_host);
s2s_destroy_session(host_session, err); -- Nothing to see here
return;
end
t_sort(srv_hosts, compare_srv_priorities);
-
+
local srv_choice = srv_hosts[1];
host_session.srv_choice = 1;
if srv_choice then
log("debug", "Best record found, will connect to %s:%d", connect_host, connect_port);
end
else
- log("debug", to_host.." has no SRV records, falling back to A");
+ log("debug", "%s has no SRV records, falling back to A/AAAA", to_host);
end
-- Try with SRV, or just the plain hostname if no SRV
local ok, err = s2sout.try_connect(host_session, connect_host, connect_port);
end
end
end, "_xmpp-server._tcp."..connect_host..".", "SRV");
-
+
return true; -- Attempt in progress
elseif host_session.ip_hosts then
return s2sout.try_connect(host_session, connect_host, connect_port, err);
connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or 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("info", "Out of connection options, can't connect to %s", tostring(host_session.to_host));
+ host_session.log("info", "Failed in all attempts to 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));
local IPs = {};
host_session.ip_hosts = IPs;
local handle4, handle6;
- local has_other = false;
-
- handle4 = adns.lookup(function (reply, err)
- handle4 = 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;
+ local have_other_result = not(has_ipv4) or not(has_ipv6) or false;
+
+ if has_ipv4 then
+ handle4 = adns.lookup(function (reply, err)
+ handle4 = 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
- -- end of CNAME resolving
+ -- end of CNAME resolving
- if reply and reply[#reply] and reply[#reply].a then
- for _, ip in ipairs(reply) do
- log("debug", "DNS reply for %s gives us %s", connect_host, ip.a);
- IPs[#IPs+1] = new_ip(ip.a, "IPv4");
+ if reply and reply[#reply] and reply[#reply].a then
+ for _, ip in ipairs(reply) do
+ log("debug", "DNS reply for %s gives us %s", connect_host, ip.a);
+ IPs[#IPs+1] = new_ip(ip.a, "IPv4");
+ end
end
- end
- if has_other then
- if #IPs > 0 then
- rfc3484_dest(host_session.ip_hosts, sources);
- for i = 1, #IPs do
- IPs[i] = {ip = IPs[i], port = connect_port};
+ if have_other_result then
+ if #IPs > 0 then
+ rfc6724_dest(host_session.ip_hosts, sources);
+ for i = 1, #IPs do
+ IPs[i] = {ip = IPs[i], port = connect_port};
+ end
+ host_session.ip_choice = 0;
+ s2sout.try_next_ip(host_session);
+ else
+ log("debug", "DNS lookup failed to get a response for %s", connect_host);
+ host_session.ip_hosts = nil;
+ if not s2sout.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);
+ err = err and (": "..err) or "";
+ s2s_destroy_session(host_session, "DNS resolution failed"..err); -- End of the line, we can't
+ end
end
- host_session.ip_choice = 0;
- s2sout.try_next_ip(host_session);
else
- log("debug", "DNS lookup failed to get a response for %s", connect_host);
- host_session.ip_hosts = nil;
- if not s2sout.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);
- err = err and (": "..err) or "";
- s2s_destroy_session(host_session, "DNS resolution failed"..err); -- End of the line, we can't
- end
+ have_other_result = true;
end
- else
- has_other = true;
- end
- end, connect_host, "A", "IN");
+ end, connect_host, "A", "IN");
+ else
+ have_other_result = true;
+ end
- handle6 = adns.lookup(function (reply, err)
- handle6 = nil;
+ if has_ipv6 then
+ handle6 = adns.lookup(function (reply, err)
+ handle6 = nil;
- if reply and reply[#reply] and reply[#reply].aaaa then
- for _, ip in ipairs(reply) do
- log("debug", "DNS reply for %s gives us %s", connect_host, ip.aaaa);
- IPs[#IPs+1] = new_ip(ip.aaaa, "IPv6");
+ if reply and reply[#reply] and reply[#reply].aaaa then
+ for _, ip in ipairs(reply) do
+ log("debug", "DNS reply for %s gives us %s", connect_host, ip.aaaa);
+ IPs[#IPs+1] = new_ip(ip.aaaa, "IPv6");
+ end
end
- end
- if has_other then
- if #IPs > 0 then
- rfc3484_dest(host_session.ip_hosts, sources);
- for i = 1, #IPs do
- IPs[i] = {ip = IPs[i], port = connect_port};
+ if have_other_result then
+ if #IPs > 0 then
+ rfc6724_dest(host_session.ip_hosts, sources);
+ for i = 1, #IPs do
+ IPs[i] = {ip = IPs[i], port = connect_port};
+ end
+ host_session.ip_choice = 0;
+ s2sout.try_next_ip(host_session);
+ else
+ log("debug", "DNS lookup failed to get a response for %s", connect_host);
+ host_session.ip_hosts = nil;
+ if not s2sout.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);
+ err = err and (": "..err) or "";
+ s2s_destroy_session(host_session, "DNS resolution failed"..err); -- End of the line, we can't
+ end
end
- host_session.ip_choice = 0;
- s2sout.try_next_ip(host_session);
else
- log("debug", "DNS lookup failed to get a response for %s", connect_host);
- host_session.ip_hosts = nil;
- if not s2sout.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);
- err = err and (": "..err) or "";
- s2s_destroy_session(host_session, "DNS resolution failed"..err); -- End of the line, we can't
- end
+ have_other_result = true;
end
- else
- has_other = true;
- end
- end, connect_host, "AAAA", "IN");
-
+ end, connect_host, "AAAA", "IN");
+ else
+ have_other_result = true;
+ end
return true;
elseif host_session.ip_hosts and #host_session.ip_hosts > host_session.ip_choice then -- Not our first attempt, and we also have IPs left to try
s2sout.try_next_ip(host_session);
end
function s2sout.make_connect(host_session, connect_host, connect_port)
- (host_session.log or log)("info", "Beginning new connection attempt to %s ([%s]:%d)", host_session.to_host, connect_host.addr, connect_port);
- -- Ok, we're going to try to connect
-
- local from_host, to_host = host_session.from_host, host_session.to_host;
-
+ (host_session.log or log)("debug", "Beginning new connection attempt to %s ([%s]:%d)", host_session.to_host, connect_host.addr, connect_port);
+
+ -- Reset secure flag in case this is another
+ -- connection attempt after a failed STARTTLS
+ host_session.secure = nil;
+ host_session.encrypted = nil;
+
local conn, handler;
- if connect_host.proto == "IPv4" then
+ local proto = connect_host.proto;
+ if proto == "IPv4" then
conn, handler = socket.tcp();
- else
- if not socket.tcp6 then
- log("warn", "Could not connect to "..to_host..". Your version of lua-socket does not support IPv6");
- return false, "no-ipv6";
- end
+ elseif proto == "IPv6" and socket.tcp6 then
conn, handler = socket.tcp6();
+ else
+ handler = "Unsupported protocol: "..tostring(proto);
end
-
+
if not conn then
log("warn", "Failed to create outgoing connection, system error: %s", handler);
return false, handler;
log("warn", "s2s connect() to %s (%s:%d) failed: %s", host_session.to_host, connect_host.addr, connect_port, err);
return false, err;
end
-
+
conn = wrapclient(conn, connect_host.addr, connect_port, s2s_listener, "*a");
host_session.conn = conn;
-
- local filter = initialize_filters(host_session);
- local w, log = conn.write, host_session.log;
- host_session.sends2s = function (t)
- log("debug", "sending: %s", (t.top_tag and t:top_tag()) or t:match("^[^>]*>?"));
- if t.name then
- t = filter("stanzas/out", t);
- end
- if t then
- t = filter("bytes/out", tostring(t));
- if t then
- return w(conn, tostring(t));
- end
- end
- end
-
+
-- Register this outgoing connection so that xmppserver_listener knows about it
-- otherwise it will assume it is a new incoming connection
s2s_listener.register_outgoing(conn, host_session);
-
- host_session:open_stream(from_host, to_host);
-
+
log("debug", "Connection attempt in progress...");
return true;
end
end
for source, _ in pairs(s2s_sources) do
if source == "*" or source == "0.0.0.0" then
- if not socket.local_addresses then
- sources[#sources + 1] = new_ip("0.0.0.0", "IPv4");
- else
- for _, addr in ipairs(socket.local_addresses("ipv4", true)) do
- sources[#sources + 1] = new_ip(addr, "IPv4");
- end
+ for _, addr in ipairs(local_addresses("ipv4", true)) do
+ sources[#sources + 1] = new_ip(addr, "IPv4");
end
elseif source == "::" then
- if not socket.local_addresses then
- sources[#sources + 1] = new_ip("::", "IPv6");
- else
- for _, addr in ipairs(socket.local_addresses("ipv6", true)) do
- sources[#sources + 1] = new_ip(addr, "IPv6");
- end
+ for _, addr in ipairs(local_addresses("ipv6", true)) do
+ sources[#sources + 1] = new_ip(addr, "IPv6");
end
else
sources[#sources + 1] = new_ip(source, (source:find(":") and "IPv6") or "IPv4");
end
end
+ for i = 1,#sources do
+ if sources[i].proto == "IPv6" then
+ has_ipv6 = true;
+ elseif sources[i].proto == "IPv4" then
+ has_ipv4 = true;
+ end
+ end
+ if not (has_ipv4 or has_ipv6) then
+ module:log("warn", "No local IPv4 or IPv6 addresses detected, outgoing connections may fail");
+ end
end);
return s2sout;
projects / prosody.git / blobdiff