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363 lines
12 KiB
363 lines
12 KiB
-- Prosody IM
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-- Copyright (C) 2008-2010 Matthew Wild
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-- Copyright (C) 2008-2010 Waqas Hussain
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--
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-- This project is MIT/X11 licensed. Please see the
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-- COPYING file in the source package for more information.
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--
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--- Module containing all the logic for connecting to a remote server
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local portmanager = require "core.portmanager";
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local wrapclient = require "net.server".wrapclient;
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local initialize_filters = require "util.filters".initialize;
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local idna_to_ascii = require "util.encodings".idna.to_ascii;
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local new_ip = require "util.ip".new_ip;
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local rfc3484_dest = require "util.rfc3484".destination;
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local socket = require "socket";
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local adns = require "net.adns";
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local dns = require "net.dns";
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local t_insert, t_sort, ipairs = table.insert, table.sort, ipairs;
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local st = require "util.stanza";
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local s2s_destroy_session = require "core.s2smanager".destroy_session;
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local log = module._log;
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local sources = {};
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local has_ipv4, has_ipv6;
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local dns_timeout = module:get_option_number("dns_timeout", 15);
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dns.settimeout(dns_timeout);
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local max_dns_depth = module:get_option_number("dns_max_depth", 3);
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local s2sout = {};
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local s2s_listener;
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function s2sout.set_listener(listener)
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s2s_listener = listener;
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end
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local function compare_srv_priorities(a,b)
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return a.priority < b.priority or (a.priority == b.priority and a.weight > b.weight);
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end
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local function session_open_stream(session, from, to)
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session.sends2s(st.stanza("stream:stream", {
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xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback',
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["xmlns:stream"]='http://etherx.jabber.org/streams',
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from=from, to=to, version='1.0', ["xml:lang"]='en'}):top_tag());
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end
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function s2sout.initiate_connection(host_session)
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initialize_filters(host_session);
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host_session.open_stream = session_open_stream;
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-- Kick the connection attempting machine into life
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if not s2sout.attempt_connection(host_session) then
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-- Intentionally not returning here, the
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-- session is needed, connected or not
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s2s_destroy_session(host_session);
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end
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if not host_session.sends2s then
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-- A sends2s which buffers data (until the stream is opened)
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-- note that data in this buffer will be sent before the stream is authed
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-- and will not be ack'd in any way, successful or otherwise
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local buffer;
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function host_session.sends2s(data)
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if not buffer then
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buffer = {};
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host_session.send_buffer = buffer;
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end
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log("debug", "Buffering data on unconnected s2sout to %s", tostring(host_session.to_host));
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buffer[#buffer+1] = data;
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log("debug", "Buffered item %d: %s", #buffer, tostring(data));
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end
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end
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end
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function s2sout.attempt_connection(host_session, err)
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local from_host, to_host = host_session.from_host, host_session.to_host;
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local connect_host, connect_port = to_host and idna_to_ascii(to_host), 5269;
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if not connect_host then
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return false;
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end
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if not err then -- This is our first attempt
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log("debug", "First attempt to connect to %s, starting with SRV lookup...", to_host);
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host_session.connecting = true;
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local handle;
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handle = adns.lookup(function (answer)
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handle = nil;
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host_session.connecting = nil;
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if answer then
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log("debug", "%s has SRV records, handling...", to_host);
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local srv_hosts = {};
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host_session.srv_hosts = srv_hosts;
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for _, record in ipairs(answer) do
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t_insert(srv_hosts, record.srv);
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end
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if #srv_hosts == 1 and srv_hosts[1].target == "." then
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log("debug", "%s does not provide a XMPP service", to_host);
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s2s_destroy_session(host_session, err); -- Nothing to see here
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return;
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end
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t_sort(srv_hosts, compare_srv_priorities);
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local srv_choice = srv_hosts[1];
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host_session.srv_choice = 1;
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if srv_choice then
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connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port;
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log("debug", "Best record found, will connect to %s:%d", connect_host, connect_port);
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end
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else
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log("debug", "%s has no SRV records, falling back to A/AAAA", to_host);
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end
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-- Try with SRV, or just the plain hostname if no SRV
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local ok, err = s2sout.try_connect(host_session, connect_host, connect_port);
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if not ok then
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if not s2sout.attempt_connection(host_session, err) then
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-- No more attempts will be made
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s2s_destroy_session(host_session, err);
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end
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end
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end, "_xmpp-server._tcp."..connect_host..".", "SRV");
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return true; -- Attempt in progress
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elseif host_session.ip_hosts then
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return s2sout.try_connect(host_session, connect_host, connect_port, err);
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elseif host_session.srv_hosts and #host_session.srv_hosts > host_session.srv_choice then -- Not our first attempt, and we also have SRV
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host_session.srv_choice = host_session.srv_choice + 1;
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local srv_choice = host_session.srv_hosts[host_session.srv_choice];
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connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port;
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host_session.log("info", "Connection failed (%s). Attempt #%d: This time to %s:%d", tostring(err), host_session.srv_choice, connect_host, connect_port);
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else
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host_session.log("info", "Out of connection options, can't connect to %s", tostring(host_session.to_host));
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-- We're out of options
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return false;
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end
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if not (connect_host and connect_port) then
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-- Likely we couldn't resolve DNS
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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));
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return false;
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end
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return s2sout.try_connect(host_session, connect_host, connect_port);
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end
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function s2sout.try_next_ip(host_session)
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host_session.connecting = nil;
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host_session.ip_choice = host_session.ip_choice + 1;
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local ip = host_session.ip_hosts[host_session.ip_choice];
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local ok, err= s2sout.make_connect(host_session, ip.ip, ip.port);
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if not ok then
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if not s2sout.attempt_connection(host_session, err or "closed") then
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err = err and (": "..err) or "";
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s2s_destroy_session(host_session, "Connection failed"..err);
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end
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end
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end
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function s2sout.try_connect(host_session, connect_host, connect_port, err)
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host_session.connecting = true;
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if not err then
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local IPs = {};
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host_session.ip_hosts = IPs;
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local handle4, handle6;
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local have_other_result = not(has_ipv4) or not(has_ipv6) or false;
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if has_ipv4 then
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handle4 = adns.lookup(function (reply, err)
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handle4 = nil;
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-- COMPAT: This is a compromise for all you CNAME-(ab)users :)
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if not (reply and reply[#reply] and reply[#reply].a) then
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local count = max_dns_depth;
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reply = dns.peek(connect_host, "CNAME", "IN");
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while count > 0 and reply and reply[#reply] and not reply[#reply].a and reply[#reply].cname do
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log("debug", "Looking up %s (DNS depth is %d)", tostring(reply[#reply].cname), count);
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reply = dns.peek(reply[#reply].cname, "A", "IN") or dns.peek(reply[#reply].cname, "CNAME", "IN");
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count = count - 1;
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end
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end
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-- end of CNAME resolving
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if reply and reply[#reply] and reply[#reply].a then
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for _, ip in ipairs(reply) do
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log("debug", "DNS reply for %s gives us %s", connect_host, ip.a);
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IPs[#IPs+1] = new_ip(ip.a, "IPv4");
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end
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end
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if have_other_result then
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if #IPs > 0 then
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rfc3484_dest(host_session.ip_hosts, sources);
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for i = 1, #IPs do
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IPs[i] = {ip = IPs[i], port = connect_port};
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end
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host_session.ip_choice = 0;
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s2sout.try_next_ip(host_session);
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else
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log("debug", "DNS lookup failed to get a response for %s", connect_host);
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host_session.ip_hosts = nil;
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if not s2sout.attempt_connection(host_session, "name resolution failed") then -- Retry if we can
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log("debug", "No other records to try for %s - destroying", host_session.to_host);
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err = err and (": "..err) or "";
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s2s_destroy_session(host_session, "DNS resolution failed"..err); -- End of the line, we can't
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end
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end
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else
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have_other_result = true;
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end
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end, connect_host, "A", "IN");
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else
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have_other_result = true;
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end
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if has_ipv6 then
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handle6 = adns.lookup(function (reply, err)
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handle6 = nil;
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if reply and reply[#reply] and reply[#reply].aaaa then
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for _, ip in ipairs(reply) do
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log("debug", "DNS reply for %s gives us %s", connect_host, ip.aaaa);
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IPs[#IPs+1] = new_ip(ip.aaaa, "IPv6");
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end
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end
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if have_other_result then
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if #IPs > 0 then
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rfc3484_dest(host_session.ip_hosts, sources);
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for i = 1, #IPs do
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IPs[i] = {ip = IPs[i], port = connect_port};
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end
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host_session.ip_choice = 0;
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s2sout.try_next_ip(host_session);
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else
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log("debug", "DNS lookup failed to get a response for %s", connect_host);
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host_session.ip_hosts = nil;
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if not s2sout.attempt_connection(host_session, "name resolution failed") then -- Retry if we can
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log("debug", "No other records to try for %s - destroying", host_session.to_host);
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err = err and (": "..err) or "";
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s2s_destroy_session(host_session, "DNS resolution failed"..err); -- End of the line, we can't
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end
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end
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else
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have_other_result = true;
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end
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end, connect_host, "AAAA", "IN");
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else
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have_other_result = true;
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end
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return true;
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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
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s2sout.try_next_ip(host_session);
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else
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host_session.ip_hosts = nil;
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if not s2sout.attempt_connection(host_session, "out of IP addresses") then -- Retry if we can
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log("debug", "No other records to try for %s - destroying", host_session.to_host);
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err = err and (": "..err) or "";
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s2s_destroy_session(host_session, "Connecting failed"..err); -- End of the line, we can't
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return false;
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end
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end
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return true;
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end
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function s2sout.make_connect(host_session, connect_host, connect_port)
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(host_session.log or log)("info", "Beginning new connection attempt to %s ([%s]:%d)", host_session.to_host, connect_host.addr, connect_port);
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-- Ok, we're going to try to connect
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local from_host, to_host = host_session.from_host, host_session.to_host;
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local conn, handler;
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if connect_host.proto == "IPv4" then
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conn, handler = socket.tcp();
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else
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conn, handler = socket.tcp6();
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end
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if not conn then
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log("warn", "Failed to create outgoing connection, system error: %s", handler);
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return false, handler;
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end
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conn:settimeout(0);
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local success, err = conn:connect(connect_host.addr, connect_port);
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if not success and err ~= "timeout" then
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log("warn", "s2s connect() to %s (%s:%d) failed: %s", host_session.to_host, connect_host.addr, connect_port, err);
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return false, err;
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end
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conn = wrapclient(conn, connect_host.addr, connect_port, s2s_listener, "*a");
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host_session.conn = conn;
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local filter = initialize_filters(host_session);
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local w, log = conn.write, host_session.log;
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host_session.sends2s = function (t)
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log("debug", "sending: %s", (t.top_tag and t:top_tag()) or t:match("^[^>]*>?"));
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if t.name then
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t = filter("stanzas/out", t);
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end
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if t then
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t = filter("bytes/out", tostring(t));
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if t then
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return w(conn, tostring(t));
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end
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end
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end
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-- Register this outgoing connection so that xmppserver_listener knows about it
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-- otherwise it will assume it is a new incoming connection
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s2s_listener.register_outgoing(conn, host_session);
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log("debug", "Connection attempt in progress...");
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return true;
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end
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module:hook_global("service-added", function (event)
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if event.name ~= "s2s" then return end
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local s2s_sources = portmanager.get_active_services():get("s2s");
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if not s2s_sources then
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module:log("warn", "s2s not listening on any ports, outgoing connections may fail");
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return;
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end
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for source, _ in pairs(s2s_sources) do
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if source == "*" or source == "0.0.0.0" then
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if not socket.local_addresses then
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sources[#sources + 1] = new_ip("0.0.0.0", "IPv4");
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else
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for _, addr in ipairs(socket.local_addresses("ipv4", true)) do
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sources[#sources + 1] = new_ip(addr, "IPv4");
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end
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end
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elseif source == "::" then
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if not socket.local_addresses then
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sources[#sources + 1] = new_ip("::", "IPv6");
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else
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for _, addr in ipairs(socket.local_addresses("ipv6", true)) do
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sources[#sources + 1] = new_ip(addr, "IPv6");
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end
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end
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else
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sources[#sources + 1] = new_ip(source, (source:find(":") and "IPv6") or "IPv4");
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end
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end
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for i = 1,#sources do
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if sources[i].proto == "IPv6" then
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has_ipv6 = true;
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elseif sources[i].proto == "IPv4" then
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has_ipv4 = true;
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end
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end
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end);
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return s2sout;
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