plugins/s2s/s2sout.lib.lua
author Matthew Wild <mwild1@gmail.com>
Sat, 28 Apr 2012 03:11:45 +0100
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mod_s2s/s2sout.lib: Fix imports and some undefined variables
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-- 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 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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    81
	local connect_host, connect_port = to_host and idna_to_ascii(to_host), 5269;
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    82
	
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    83
	if not connect_host then
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    84
		return false;
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    85
	end
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diff changeset
    86
	
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    87
	if not err then -- This is our first attempt
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    88
		log("debug", "First attempt to connect to %s, starting with SRV lookup...", to_host);
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    89
		host_session.connecting = true;
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diff changeset
    90
		local handle;
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    91
		handle = adns.lookup(function (answer)
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    92
			handle = nil;
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    93
			host_session.connecting = nil;
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    94
			if answer then
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    95
				log("debug", to_host.." has SRV records, handling...");
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    96
				local srv_hosts = {};
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    97
				host_session.srv_hosts = srv_hosts;
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    98
				for _, record in ipairs(answer) do
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    99
					t_insert(srv_hosts, record.srv);
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   100
				end
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   101
				if #srv_hosts == 1 and srv_hosts[1].target == "." then
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   102
					log("debug", to_host.." does not provide a XMPP service");
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   103
					s2s_destroy_session(host_session, err); -- Nothing to see here
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   104
					return;
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   105
				end
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   106
				t_sort(srv_hosts, compare_srv_priorities);
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   107
				
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   108
				local srv_choice = srv_hosts[1];
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   109
				host_session.srv_choice = 1;
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   110
				if srv_choice then
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   111
					connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port;
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   112
					log("debug", "Best record found, will connect to %s:%d", connect_host, connect_port);
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   113
				end
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   114
			else
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   115
				log("debug", to_host.." has no SRV records, falling back to A");
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   116
			end
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   117
			-- Try with SRV, or just the plain hostname if no SRV
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   118
			local ok, err = s2sout.try_connect(host_session, connect_host, connect_port);
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   119
			if not ok then
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   120
				if not s2sout.attempt_connection(host_session, err) then
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   121
					-- No more attempts will be made
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   122
					s2s_destroy_session(host_session, err);
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   123
				end
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   124
			end
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   125
		end, "_xmpp-server._tcp."..connect_host..".", "SRV");
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diff changeset
   126
		
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   127
		return true; -- Attempt in progress
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   128
	elseif host_session.ip_hosts then
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diff changeset
   129
		return s2sout.try_connect(host_session, connect_host, connect_port, err);
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   130
	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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   131
		host_session.srv_choice = host_session.srv_choice + 1;
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   132
		local srv_choice = host_session.srv_hosts[host_session.srv_choice];
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   133
		connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port;
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diff changeset
   134
		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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   135
	else
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   136
		host_session.log("info", "Out of connection options, can't connect to %s", tostring(host_session.to_host));
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   137
		-- We're out of options
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   138
		return false;
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   139
	end
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diff changeset
   140
	
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diff changeset
   141
	if not (connect_host and connect_port) then
3dce04129693 s2smanager, mod_s2s, mod_s2s/s2sout: Split connection handling out of s2smanager into mod_s2s, and further split connection logic for s2sout to a module lib, s2sout.lib.lua
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   142
		-- Likely we couldn't resolve DNS
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diff changeset
   143
		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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   144
		return false;
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   145
	end
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   146
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   147
	return s2sout.try_connect(host_session, connect_host, connect_port);
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   148
end
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   149
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   150
function s2sout.try_next_ip(host_session)
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   151
	host_session.connecting = nil;
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   152
	host_session.ip_choice = host_session.ip_choice + 1;
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   153
	local ip = host_session.ip_hosts[host_session.ip_choice];
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   154
	local ok, err= s2sout.make_connect(host_session, ip.ip, ip.port);
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   155
	if not ok then
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   156
		if not s2sout.attempt_connection(host_session, err or "closed") then
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   157
			err = err and (": "..err) or "";
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   158
			s2s_destroy_session(host_session, "Connection failed"..err);
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   159
		end
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   160
	end
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   161
end
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   162
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   163
function s2sout.try_connect(host_session, connect_host, connect_port, err)
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   164
	host_session.connecting = true;
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   165
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   166
	if not err then
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   167
		local IPs = {};
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   168
		host_session.ip_hosts = IPs;
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   169
		local handle4, handle6;
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   170
		local has_other = false;
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   171
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   172
		handle4 = adns.lookup(function (reply, err)
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   173
			handle4 = nil;
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   174
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   175
			-- COMPAT: This is a compromise for all you CNAME-(ab)users :)
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   176
			if not (reply and reply[#reply] and reply[#reply].a) then
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   177
				local count = max_dns_depth;
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   178
				reply = dns.peek(connect_host, "CNAME", "IN");
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   179
				while count > 0 and reply and reply[#reply] and not reply[#reply].a and reply[#reply].cname do
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   180
					log("debug", "Looking up %s (DNS depth is %d)", tostring(reply[#reply].cname), count);
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   181
					reply = dns.peek(reply[#reply].cname, "A", "IN") or dns.peek(reply[#reply].cname, "CNAME", "IN");
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   182
					count = count - 1;
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   183
				end
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   184
			end
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   185
			-- end of CNAME resolving
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   186
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   187
			if reply and reply[#reply] and reply[#reply].a then
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   188
				for _, ip in ipairs(reply) do
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   189
					log("debug", "DNS reply for %s gives us %s", connect_host, ip.a);
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   190
					IPs[#IPs+1] = new_ip(ip.a, "IPv4");
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   191
				end
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   192
			end
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   193
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   194
			if has_other then
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   195
				if #IPs > 0 then
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   196
					rfc3484_dest(host_session.ip_hosts, sources);
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   197
					for i = 1, #IPs do
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   198
						IPs[i] = {ip = IPs[i], port = connect_port};
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   199
					end
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   200
					host_session.ip_choice = 0;
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   201
					s2sout.try_next_ip(host_session);
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   202
				else
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   203
					log("debug", "DNS lookup failed to get a response for %s", connect_host);
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   204
					host_session.ip_hosts = nil;
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   205
					if not s2sout.attempt_connection(host_session, "name resolution failed") then -- Retry if we can
3dce04129693 s2smanager, mod_s2s, mod_s2s/s2sout: Split connection handling out of s2smanager into mod_s2s, and further split connection logic for s2sout to a module lib, s2sout.lib.lua
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   206
						log("debug", "No other records to try for %s - destroying", host_session.to_host);
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   207
						err = err and (": "..err) or "";
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   208
						s2s_destroy_session(host_session, "DNS resolution failed"..err); -- End of the line, we can't
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   209
					end
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   210
				end
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   211
			else
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   212
				has_other = true;
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   213
			end
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   214
		end, connect_host, "A", "IN");
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   215
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   216
		handle6 = adns.lookup(function (reply, err)
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   217
			handle6 = nil;
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   218
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   219
			if reply and reply[#reply] and reply[#reply].aaaa then
3dce04129693 s2smanager, mod_s2s, mod_s2s/s2sout: Split connection handling out of s2smanager into mod_s2s, and further split connection logic for s2sout to a module lib, s2sout.lib.lua
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   220
				for _, ip in ipairs(reply) do
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   221
					log("debug", "DNS reply for %s gives us %s", connect_host, ip.aaaa);
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   222
					IPs[#IPs+1] = new_ip(ip.aaaa, "IPv6");
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   223
				end
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   224
			end
3dce04129693 s2smanager, mod_s2s, mod_s2s/s2sout: Split connection handling out of s2smanager into mod_s2s, and further split connection logic for s2sout to a module lib, s2sout.lib.lua
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   225
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   226
			if has_other then
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   227
				if #IPs > 0 then
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   228
					rfc3484_dest(host_session.ip_hosts, sources);
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   229
					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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   241
					end
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   242
				end
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   243
			else
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				has_other = true;
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			end
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		end, connect_host, "AAAA", "IN");
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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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   251
	else
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		host_session.ip_hosts = nil;
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   253
		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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   257
			return false;
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   258
		end
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   259
	end
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   260
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   261
	return true;
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   262
end
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   263
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   264
function s2sout.make_connect(host_session, connect_host, connect_port)
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   265
	(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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   266
	-- Ok, we're going to try to connect
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   267
	
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   268
	local from_host, to_host = host_session.from_host, host_session.to_host;
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   269
	
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   270
	local conn, handler;
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   271
	if connect_host.proto == "IPv4" then
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   272
		conn, handler = socket.tcp();
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   273
	else
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   274
		conn, handler = socket.tcp6();
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   275
	end
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   276
	
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   277
	if not conn then
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   278
		log("warn", "Failed to create outgoing connection, system error: %s", handler);
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   279
		return false, handler;
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   280
	end
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   281
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   282
	conn:settimeout(0);
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   283
	local success, err = conn:connect(connect_host.addr, connect_port);
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   284
	if not success and err ~= "timeout" then
3dce04129693 s2smanager, mod_s2s, mod_s2s/s2sout: Split connection handling out of s2smanager into mod_s2s, and further split connection logic for s2sout to a module lib, s2sout.lib.lua
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   285
		log("warn", "s2s connect() to %s (%s:%d) failed: %s", host_session.to_host, connect_host.addr, connect_port, err);
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   286
		return false, err;
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   287
	end
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   288
	
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   289
	conn = wrapclient(conn, connect_host.addr, connect_port, s2s_listener, "*a");
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   290
	host_session.conn = conn;
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   291
	
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   292
	local filter = initialize_filters(host_session);
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   293
	local w, log = conn.write, host_session.log;
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   294
	host_session.sends2s = function (t)
3dce04129693 s2smanager, mod_s2s, mod_s2s/s2sout: Split connection handling out of s2smanager into mod_s2s, and further split connection logic for s2sout to a module lib, s2sout.lib.lua
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   295
		log("debug", "sending: %s", (t.top_tag and t:top_tag()) or t:match("^[^>]*>?"));
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   296
		if t.name then
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   297
			t = filter("stanzas/out", t);
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   298
		end
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   299
		if t then
3dce04129693 s2smanager, mod_s2s, mod_s2s/s2sout: Split connection handling out of s2smanager into mod_s2s, and further split connection logic for s2sout to a module lib, s2sout.lib.lua
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   300
			t = filter("bytes/out", tostring(t));
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   301
			if t then
3dce04129693 s2smanager, mod_s2s, mod_s2s/s2sout: Split connection handling out of s2smanager into mod_s2s, and further split connection logic for s2sout to a module lib, s2sout.lib.lua
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   302
				return w(conn, tostring(t));
3dce04129693 s2smanager, mod_s2s, mod_s2s/s2sout: Split connection handling out of s2smanager into mod_s2s, and further split connection logic for s2sout to a module lib, s2sout.lib.lua
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   303
			end
3dce04129693 s2smanager, mod_s2s, mod_s2s/s2sout: Split connection handling out of s2smanager into mod_s2s, and further split connection logic for s2sout to a module lib, s2sout.lib.lua
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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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	host_session:open_stream(from_host, to_host);
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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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end);
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return s2sout;