prosody
3a7a0b9f42f3
plugins/mod_proxy65.lua

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plugins/mod_proxy65.lua @ 9089:3a7a0b9f42f3

util.dataforms: Skip all fields for the 'cancel' form type XEP-0004 says: > a data form of type "cancel" SHOULD NOT contain any <field/> elements. The title and instructions don't seem to be of much value in this case either. I'm not aware of 'cancel' being used anywhere, so this should break nothing. Early return is always nice.
author Kim Alvefur <zash@zash.se>
date Fri, 03 Aug 2018 21:06:59 +0200
parent 8728:41c959c5c84b
child 9146:6bd3602a70e2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 local portmanager = require "core.portmanager";
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18
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19 local sessions, transfers = module:shared("sessions", "transfers");
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20 local max_buffer_size = 4096;
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21
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22 local listener = {};
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23
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24 function listener.onincoming(conn, data)
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25 local session = sessions[conn] or {};
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26
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27 local transfer = transfers[session.sha];
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28 if transfer and transfer.activated then -- copy data between initiator and target
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29 local initiator, target = transfer.initiator, transfer.target;
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30 (conn == initiator and target or initiator):write(data);
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31 return;
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32 end -- FIXME server.link should be doing this?
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33
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34 if not session.greeting_done then
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35 local nmethods = data:byte(2) or 0;
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36 if data:byte(1) == 0x05 and nmethods > 0 and #data == 2 + nmethods then -- check if we have all the data
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37 if data:find("%z") then -- 0x00 = 'No authentication' is supported
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38 session.greeting_done = true;
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39 sessions[conn] = session;
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40 conn:write("\5\0"); -- send (SOCKS version 5, No authentication)
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41 module:log("debug", "SOCKS5 greeting complete");
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42 return;
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43 end
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44 end -- else error, unexpected input
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45 conn:write("\5\255"); -- send (SOCKS version 5, no acceptable method)
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46 conn:close();
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47 module:log("debug", "Invalid SOCKS5 greeting received: '%s'", b64(data));
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48 else -- connection request
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49 --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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50 if #data == 47 and data:sub(1,5) == "\5\1\0\3\40" and data:sub(-2) == "\0\0" then
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51 local sha = data:sub(6, 45);
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52 conn:pause();
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53 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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54 if not transfers[sha] then
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55 transfers[sha] = {};
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56 transfers[sha].target = conn;
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57 session.sha = sha;
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58 module:log("debug", "SOCKS5 target connected for session %s", sha);
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59 else -- transfers[sha].target ~= nil
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60 transfers[sha].initiator = conn;
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61 session.sha = sha;
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62 module:log("debug", "SOCKS5 initiator connected for session %s", sha);
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63 server.link(conn, transfers[sha].target, max_buffer_size);
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64 server.link(transfers[sha].target, conn, max_buffer_size);
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65 end
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66 else -- error, unexpected input
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67 conn:write("\5\1\0\3\0\0\0"); -- VER, REP, RSV, ATYP, BND.ADDR (sha), BND.PORT (2 Byte)
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68 conn:close();
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69 module:log("debug", "Invalid SOCKS5 negotiation received: '%s'", b64(data));
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70 end
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71 end
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72 end
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73
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74 function listener.ondisconnect(conn)
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75 local session = sessions[conn];
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76 if session then
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77 if transfers[session.sha] then
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78 local initiator, target = transfers[session.sha].initiator, transfers[session.sha].target;
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79 if initiator == conn and target ~= nil then
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80 target:close();
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81 elseif target == conn and initiator ~= nil then
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82 initiator:close();
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83 end
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84 transfers[session.sha] = nil;
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85 end
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86 -- Clean up any session-related stuff here
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87 sessions[conn] = nil;
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88 end
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89 end
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90
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91 function module.add_host(module)
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92 local host, name = module:get_host(), module:get_option_string("name", "SOCKS5 Bytestreams Service");
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93
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94 local proxy_address = module:get_option_string("proxy65_address", host);
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95 local proxy_port = next(portmanager.get_active_services():search("proxy65", nil)[1] or {});
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96 local proxy_acl = module:get_option_array("proxy65_acl");
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97
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98 -- COMPAT w/pre-0.9 where proxy65_port was specified in the components section of the config
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99 local legacy_config = module:get_option_number("proxy65_port");
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100 if legacy_config then
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101 module:log("warn", "proxy65_port is deprecated, please put proxy65_ports = { %d } into the global section instead", legacy_config);
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102 end
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103
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104 module:depends("disco");
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105 module:add_identity("proxy", "bytestreams", name);
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106 module:add_feature("http://jabber.org/protocol/bytestreams");
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107
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108 module:hook("iq-get/host/http://jabber.org/protocol/bytestreams:query", function(event)
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109 local origin, stanza = event.origin, event.stanza;
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110
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111 -- check ACL
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112 -- using 'while' instead of 'if' so we can break out of it
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113 while proxy_acl and #proxy_acl > 0 do --luacheck: ignore 512
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114 local jid = stanza.attr.from;
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115 local allow;
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116 for _, acl in ipairs(proxy_acl) do
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117 if jid_compare(jid, acl) then allow = true; break; end
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118 end
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119 if allow then break; end
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120 module:log("warn", "Denying use of proxy for %s", tostring(stanza.attr.from));
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121 origin.send(st.error_reply(stanza, "auth", "forbidden"));
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122 return true;
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123 end
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bd0ff8ae98a8 Remove all trailing whitespace
Florian Zeitz <florob@babelmonkeys.de>
parents: 5375
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124
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125 local sid = stanza.tags[1].attr.sid;
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126 origin.send(st.reply(stanza):tag("query", {xmlns="http://jabber.org/protocol/bytestreams", sid=sid})
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127 :tag("streamhost", {jid=host, host=proxy_address, port=("%d"):format(proxy_port)}));
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128 return true;
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129 end);
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130
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131 module:hook("iq-set/host/http://jabber.org/protocol/bytestreams:query", function(event)
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132 local origin, stanza = event.origin, event.stanza;
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133
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134 local query = stanza.tags[1];
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135 local sid = query.attr.sid;
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136 local from = stanza.attr.from;
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137 local to = query:get_child_text("activate");
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138 local prepped_to = jid_prep(to);
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139
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140 local info = "sid: "..tostring(sid)..", initiator: "..tostring(from)..", target: "..tostring(prepped_to or to);
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141 if prepped_to and sid then
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142 local sha = sha1(sid .. from .. prepped_to, true);
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143 if not transfers[sha] then
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144 module:log("debug", "Activation request has unknown session id; activation failed (%s)", info);
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145 origin.send(st.error_reply(stanza, "modify", "item-not-found"));
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146 elseif not transfers[sha].initiator then
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147 module:log("debug", "The sender was not connected to the proxy; activation failed (%s)", info);
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148 origin.send(st.error_reply(stanza, "cancel", "not-allowed", "The sender (you) is not connected to the proxy"));
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149 --elseif not transfers[sha].target then -- can't happen, as target is set when a transfer object is created
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150 -- module:log("debug", "The recipient 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 recipient is not connected to the proxy"));
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152 else -- if transfers[sha].initiator ~= nil and transfers[sha].target ~= nil then
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153 module:log("debug", "Transfer activated (%s)", info);
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154 transfers[sha].activated = true;
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155 transfers[sha].target:resume();
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156 transfers[sha].initiator:resume();
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157 origin.send(st.reply(stanza));
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158 end
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159 elseif to and sid then
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160 module:log("debug", "Malformed activation jid; activation failed (%s)", info);
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161 origin.send(st.error_reply(stanza, "modify", "jid-malformed"));
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162 else
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163 module:log("debug", "Bad request; activation failed (%s)", info);
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164 origin.send(st.error_reply(stanza, "modify", "bad-request"));
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165 end
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166 return true;
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167 end);
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parents:
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168 end
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parents:
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169
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170 module:provides("net", {
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171 default_port = 5000;
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172 listener = listener;
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173 multiplex = {
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174 pattern = "^\5";
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175 };
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176 });