plugins/mod_s2s/s2sout.lib.lua
author Matthew Wild <mwild1@gmail.com>
Thu, 24 May 2012 03:08:42 +0100
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mod_s2s, s2sout.lib: Send stream header in onconnect()
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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 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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    82
	local from_host, to_host = host_session.from_host, host_session.to_host;
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    83
	local connect_host, connect_port = to_host and idna_to_ascii(to_host), 5269;
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    84
	
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    85
	if not connect_host then
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    86
		return false;
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    87
	end
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    88
	
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    89
	if not err then -- This is our first attempt
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    90
		log("debug", "First attempt to connect to %s, starting with SRV lookup...", to_host);
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    91
		host_session.connecting = true;
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    92
		local handle;
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    93
		handle = adns.lookup(function (answer)
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    94
			handle = nil;
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    95
			host_session.connecting = nil;
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    96
			if answer then
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    97
				log("debug", to_host.." has SRV records, handling...");
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    98
				local srv_hosts = {};
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    99
				host_session.srv_hosts = srv_hosts;
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   100
				for _, record in ipairs(answer) do
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   101
					t_insert(srv_hosts, record.srv);
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   102
				end
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   103
				if #srv_hosts == 1 and srv_hosts[1].target == "." then
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   104
					log("debug", to_host.." does not provide a XMPP service");
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   105
					s2s_destroy_session(host_session, err); -- Nothing to see here
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   106
					return;
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   107
				end
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   108
				t_sort(srv_hosts, compare_srv_priorities);
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   109
				
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   110
				local srv_choice = srv_hosts[1];
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   111
				host_session.srv_choice = 1;
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   112
				if srv_choice then
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   113
					connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port;
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   114
					log("debug", "Best record found, will connect to %s:%d", connect_host, connect_port);
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   115
				end
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   116
			else
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   117
				log("debug", to_host.." has no SRV records, falling back to A");
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   118
			end
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   119
			-- Try with SRV, or just the plain hostname if no SRV
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   120
			local ok, err = s2sout.try_connect(host_session, connect_host, connect_port);
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   121
			if not ok then
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   122
				if not s2sout.attempt_connection(host_session, err) then
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   123
					-- No more attempts will be made
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   124
					s2s_destroy_session(host_session, err);
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   125
				end
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   126
			end
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   127
		end, "_xmpp-server._tcp."..connect_host..".", "SRV");
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   128
		
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   129
		return true; -- Attempt in progress
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   130
	elseif host_session.ip_hosts then
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   131
		return s2sout.try_connect(host_session, connect_host, connect_port, err);
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   132
	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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   133
		host_session.srv_choice = host_session.srv_choice + 1;
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   134
		local srv_choice = host_session.srv_hosts[host_session.srv_choice];
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   135
		connect_host, connect_port = srv_choice.target or to_host, srv_choice.port or connect_port;
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   136
		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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   137
	else
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   138
		host_session.log("info", "Out of connection options, can't connect to %s", tostring(host_session.to_host));
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   139
		-- We're out of options
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   140
		return false;
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   141
	end
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   142
	
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   143
	if not (connect_host and connect_port) then
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   144
		-- Likely we couldn't resolve DNS
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   145
		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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   146
		return false;
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   147
	end
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   148
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   149
	return s2sout.try_connect(host_session, connect_host, connect_port);
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   150
end
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   151
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   152
function s2sout.try_next_ip(host_session)
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   153
	host_session.connecting = nil;
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   154
	host_session.ip_choice = host_session.ip_choice + 1;
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   155
	local ip = host_session.ip_hosts[host_session.ip_choice];
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   156
	local ok, err= s2sout.make_connect(host_session, ip.ip, ip.port);
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   157
	if not ok then
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   158
		if not s2sout.attempt_connection(host_session, err or "closed") then
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   159
			err = err and (": "..err) or "";
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   160
			s2s_destroy_session(host_session, "Connection failed"..err);
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   161
		end
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   162
	end
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   163
end
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   164
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   165
function s2sout.try_connect(host_session, connect_host, connect_port, err)
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   166
	host_session.connecting = true;
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   167
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   168
	if not err then
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   169
		local IPs = {};
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   170
		host_session.ip_hosts = IPs;
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   171
		local handle4, handle6;
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   172
		local has_other = false;
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   173
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   174
		handle4 = adns.lookup(function (reply, err)
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   175
			handle4 = nil;
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   176
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   177
			-- COMPAT: This is a compromise for all you CNAME-(ab)users :)
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   178
			if not (reply and reply[#reply] and reply[#reply].a) then
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   179
				local count = max_dns_depth;
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   180
				reply = dns.peek(connect_host, "CNAME", "IN");
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   181
				while count > 0 and reply and reply[#reply] and not reply[#reply].a and reply[#reply].cname do
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   182
					log("debug", "Looking up %s (DNS depth is %d)", tostring(reply[#reply].cname), count);
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   183
					reply = dns.peek(reply[#reply].cname, "A", "IN") or dns.peek(reply[#reply].cname, "CNAME", "IN");
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   184
					count = count - 1;
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   185
				end
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   186
			end
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   187
			-- end of CNAME resolving
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   188
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   189
			if reply and reply[#reply] and reply[#reply].a 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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   190
				for _, ip in ipairs(reply) do
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   191
					log("debug", "DNS reply for %s gives us %s", connect_host, ip.a);
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   192
					IPs[#IPs+1] = new_ip(ip.a, "IPv4");
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   193
				end
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   194
			end
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   195
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   196
			if has_other then
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   197
				if #IPs > 0 then
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   198
					rfc3484_dest(host_session.ip_hosts, sources);
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   199
					for i = 1, #IPs do
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   200
						IPs[i] = {ip = IPs[i], port = connect_port};
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   201
					end
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   202
					host_session.ip_choice = 0;
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   203
					s2sout.try_next_ip(host_session);
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   204
				else
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   205
					log("debug", "DNS lookup failed to get a response for %s", connect_host);
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   206
					host_session.ip_hosts = nil;
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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   207
					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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   208
						log("debug", "No other records to try for %s - destroying", host_session.to_host);
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   209
						err = err and (": "..err) or "";
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   210
						s2s_destroy_session(host_session, "DNS resolution failed"..err); -- End of the line, we can't
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   211
					end
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   212
				end
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   213
			else
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   214
				has_other = true;
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   215
			end
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   216
		end, connect_host, "A", "IN");
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   217
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   218
		handle6 = adns.lookup(function (reply, err)
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   219
			handle6 = nil;
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   220
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diff changeset
   221
			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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   222
				for _, ip in ipairs(reply) do
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   223
					log("debug", "DNS reply for %s gives us %s", connect_host, ip.aaaa);
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   224
					IPs[#IPs+1] = new_ip(ip.aaaa, "IPv6");
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   225
				end
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   226
			end
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   227
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   228
			if has_other then
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   229
				if #IPs > 0 then
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   230
					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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   235
					s2sout.try_next_ip(host_session);
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   236
				else
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   237
					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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   239
					if not s2sout.attempt_connection(host_session, "name resolution failed") then -- Retry if we can
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   240
						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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   243
					end
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   244
				end
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			else
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				has_other = true;
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   247
			end
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   248
		end, connect_host, "AAAA", "IN");
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   249
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		return true;
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   251
	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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   252
		s2sout.try_next_ip(host_session);
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   253
	else
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		host_session.ip_hosts = nil;
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   255
		if not s2sout.attempt_connection(host_session, "out of IP addresses") then -- Retry if we can
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   256
			log("debug", "No other records to try for %s - destroying", host_session.to_host);
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   257
			err = err and (": "..err) or "";
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   258
			s2s_destroy_session(host_session, "Connecting failed"..err); -- End of the line, we can't
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   259
			return false;
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   260
		end
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   261
	end
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   262
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   263
	return true;
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   264
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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   265
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   266
function s2sout.make_connect(host_session, connect_host, connect_port)
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   267
	(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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   268
	-- Ok, we're going to try to connect
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   269
	
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   270
	local from_host, to_host = host_session.from_host, host_session.to_host;
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   271
	
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   272
	local conn, handler;
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   273
	if connect_host.proto == "IPv4" then
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   274
		conn, handler = socket.tcp();
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   275
	else
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   276
		if not socket.tcp6 then
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   277
			log("warn", "Could not connect to "..to_host..". Your version of lua-socket does not support IPv6");
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   278
			return false, "no-ipv6";
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   279
		end
4555
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   280
		conn, handler = socket.tcp6();
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   281
	end
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   282
	
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   283
	if not conn 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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   284
		log("warn", "Failed to create outgoing connection, system error: %s", handler);
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
		return false, handler;
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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   286
	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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   287
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   288
	conn:settimeout(0);
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   289
	local success, err = conn:connect(connect_host.addr, connect_port);
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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   290
	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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   291
		log("warn", "s2s connect() to %s (%s:%d) failed: %s", host_session.to_host, connect_host.addr, connect_port, err);
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   292
		return false, err;
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   293
	end
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   294
	
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   295
	conn = wrapclient(conn, connect_host.addr, connect_port, s2s_listener, "*a");
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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   296
	host_session.conn = conn;
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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   297
	
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   298
	local filter = initialize_filters(host_session);
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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   299
	local w, log = conn.write, host_session.log;
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
	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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   301
		log("debug", "sending: %s", (t.top_tag and t:top_tag()) or t:match("^[^>]*>?"));
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   302
		if t.name 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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diff changeset
   303
			t = filter("stanzas/out", 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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   304
		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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   305
		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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diff changeset
   306
			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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end);
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return s2sout;