prosody
5b52b5eaa03d
plugins/mod_proxy65.lua

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plugins/mod_proxy65.lua @ 4679:5b52b5eaa03d

mod_proxy65: Port to portmanager, make a shared module
author Matthew Wild <mwild1@gmail.com>
date Tue, 24 Apr 2012 18:50:22 +0100
parent 4414:aa2e79f20962
child 4685:3d90264c7b3d
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1 -- Prosody IM
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2 -- Copyright (C) 2008-2011 Matthew Wild
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3 -- Copyright (C) 2008-2011 Waqas Hussain
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4 -- Copyright (C) 2009 Thilo Cestonaro
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5 --
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6 -- This project is MIT/X11 licensed. Please see the
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7 -- COPYING file in the source package for more information.
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8 --
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9
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10 module:set_global();
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11
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12 local jid_compare, jid_prep = require "util.jid".compare, require "util.jid".prep;
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13 local st = require "util.stanza";
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14 local sha1 = require "util.hashes".sha1;
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15 local b64 = require "util.encodings".base64.encode;
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16 local server = require "net.server";
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17
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18 local sessions, transfers = module:shared("sessions", "transfers");
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19 local max_buffer_size = 4096;
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20
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21 local listener = {};
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22
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23 function listener.onincoming(conn, data)
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24 local session = sessions[conn] or {};
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25
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26 local transfer = transfers[session.sha];
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27 if transfer and transfer.activated then -- copy data between initiator and target
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28 local initiator, target = transfer.initiator, transfer.target;
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29 (conn == initiator and target or initiator):write(data);
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30 return;
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31 end -- FIXME server.link should be doing this?
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33 if not session.greeting_done then
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34 local nmethods = data:byte(2) or 0;
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35 if data:byte(1) == 0x05 and nmethods > 0 and #data == 2 + nmethods then -- check if we have all the data
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36 if data:find("%z") then -- 0x00 = 'No authentication' is supported
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37 session.greeting_done = true;
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38 sessions[conn] = session;
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39 conn:write("\5\0"); -- send (SOCKS version 5, No authentication)
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40 module:log("debug", "SOCKS5 greeting complete");
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41 return;
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42 end
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43 end -- else error, unexpected input
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44 conn:write("\5\255"); -- send (SOCKS version 5, no acceptable method)
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45 conn:close();
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46 module:log("debug", "Invalid SOCKS5 greeting recieved: '%s'", b64(data));
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47 else -- connection request
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48 --local head = string.char( 0x05, 0x01, 0x00, 0x03, 40 ); -- ( VER=5=SOCKS5, CMD=1=CONNECT, RSV=0=RESERVED, ATYP=3=DOMAIMNAME, SHA-1 size )
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49 if #data == 47 and data:sub(1,5) == "\5\1\0\3\40" and data:sub(-2) == "\0\0" then
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50 local sha = data:sub(6, 45);
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51 conn:pause();
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52 conn:write("\5\0\0\3\40" .. sha .. "\0\0"); -- VER, REP, RSV, ATYP, BND.ADDR (sha), BND.PORT (2 Byte)
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53 if not transfers[sha] then
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54 transfers[sha] = {};
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55 transfers[sha].target = conn;
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56 session.sha = sha;
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57 module:log("debug", "SOCKS5 target connected for session %s", sha);
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58 else -- transfers[sha].target ~= nil
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59 transfers[sha].initiator = conn;
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60 session.sha = sha;
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61 module:log("debug", "SOCKS5 initiator connected for session %s", sha);
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62 server.link(conn, transfers[sha].target, max_buffer_size);
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63 server.link(transfers[sha].target, conn, max_buffer_size);
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64 end
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65 else -- error, unexpected input
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66 conn:write("\5\1\0\3\0\0\0"); -- VER, REP, RSV, ATYP, BND.ADDR (sha), BND.PORT (2 Byte)
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67 conn:close();
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68 module:log("debug", "Invalid SOCKS5 negotiation recieved: '%s'", b64(data));
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69 end
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70 end
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71 end
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72
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73 function listener.ondisconnect(conn, err)
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74 local session = sessions[conn];
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75 if session then
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76 if transfers[session.sha] then
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77 local initiator, target = transfers[session.sha].initiator, transfers[session.sha].target;
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78 if initiator == conn and target ~= nil then
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79 target:close();
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80 elseif target == conn and initiator ~= nil then
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81 initiator:close();
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82 end
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83 transfers[session.sha] = nil;
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84 end
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85 -- Clean up any session-related stuff here
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86 sessions[conn] = nil;
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87 end
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88 end
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89
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90 function module.add_host(module)
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91 local host, name = module:get_host(), module:get_option_string("name", "SOCKS5 Bytestreams Service");
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92
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93 local proxy_address = module:get_option("proxy65_address", host);
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94 local proxy_port = module:get_option_number("proxy65_port", next(portmanager.get_active_services():search("proxy65", nil)[1]));
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95 local proxy_acl = module:get_option("proxy65_acl");
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96
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97 module:add_identity("proxy", "bytestreams", name);
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98 module:add_feature("http://jabber.org/protocol/bytestreams");
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99
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100 module:hook("iq-get/host/http://jabber.org/protocol/disco#info:query", function(event)
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101 local origin, stanza = event.origin, event.stanza;
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102 origin.send(st.reply(stanza):query("http://jabber.org/protocol/disco#info")
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103 :tag("identity", {category='proxy', type='bytestreams', name=name}):up()
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104 :tag("feature", {var="http://jabber.org/protocol/bytestreams"}) );
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105 return true;
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106 end, -1);
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107
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108 module:hook("iq-get/host/http://jabber.org/protocol/disco#items:query", function(event)
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109 local origin, stanza = event.origin, event.stanza;
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110 origin.send(st.reply(stanza):query("http://jabber.org/protocol/disco#items"));
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111 return true;
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112 end, -1);
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113
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114 module:hook("iq-get/host/http://jabber.org/protocol/bytestreams:query", function(event)
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115 local origin, stanza = event.origin, event.stanza;
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116
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117 -- check ACL
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118 while proxy_acl and #proxy_acl > 0 do -- using 'while' instead of 'if' so we can break out of it
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119 local jid = stanza.attr.from;
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120 for _, acl in ipairs(proxy_acl) do
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121 if jid_compare(jid, acl) then break; end
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122 end
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123 module:log("warn", "Denying use of proxy for %s", tostring(stanza.attr.from));
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124 origin.send(st.error_reply(stanza, "auth", "forbidden"));
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125 return true;
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126 end
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127
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128 local sid = stanza.tags[1].attr.sid;
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129 origin.send(st.reply(stanza):tag("query", {xmlns="http://jabber.org/protocol/bytestreams", sid=sid})
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130 :tag("streamhost", {jid=host, host=proxy_address, port=proxy_port}));
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131 return true;
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132 end);
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133
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134 module:hook("iq-set/host/http://jabber.org/protocol/bytestreams:query", function(event)
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135 local origin, stanza = event.origin, event.stanza;
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136
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137 local query = stanza.tags[1];
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138 local sid = query.attr.sid;
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139 local from = stanza.attr.from;
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140 local to = query:get_child_text("activate");
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141 local prepped_to = jid_prep(to);
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142
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143 local info = "sid: "..tostring(sid)..", initiator: "..tostring(from)..", target: "..tostring(prepped_to or to);
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144 if prepped_to and sid then
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145 local sha = sha1(sid .. from .. prepped_to, true);
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146 if not transfers[sha] then
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147 module:log("debug", "Activation request has unknown session id; activation failed (%s)", info);
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148 origin.send(st.error_reply(stanza, "modify", "item-not-found"));
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149 elseif not transfers[sha].initiator then
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150 module:log("debug", "The sender was not connected to the proxy; activation failed (%s)", info);
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151 origin.send(st.error_reply(stanza, "cancel", "not-allowed", "The sender (you) is not connected to the proxy"));
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152 --elseif not transfers[sha].target then -- can't happen, as target is set when a transfer object is created
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153 -- module:log("debug", "The recipient was not connected to the proxy; activation failed (%s)", info);
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154 -- origin.send(st.error_reply(stanza, "cancel", "not-allowed", "The recipient is not connected to the proxy"));
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155 else -- if transfers[sha].initiator ~= nil and transfers[sha].target ~= nil then
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156 module:log("debug", "Transfer activated (%s)", info);
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157 transfers[sha].activated = true;
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158 transfers[sha].target:resume();
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159 transfers[sha].initiator:resume();
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160 origin.send(st.reply(stanza));
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161 end
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162 elseif to and sid then
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163 module:log("debug", "Malformed activation jid; activation failed (%s)", info);
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164 origin.send(st.error_reply(stanza, "modify", "jid-malformed"));
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165 else
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166 module:log("debug", "Bad request; activation failed (%s)", info);
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167 origin.send(st.error_reply(stanza, "modify", "bad-request"));
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168 end
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169 return true;
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170 end);
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171 end
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172
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173 module:provides("net", {
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174 default_port = 5000;
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175 listener = listener;
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176 });