prosody
7ec7dba7ba8b
plugins/mod_proxy65.lua

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plugins/mod_proxy65.lua @ 11109:7ec7dba7ba8b 0.11

mod_websocket: Add separate limit for frame buffer size
author Matthew Wild <mwild1@gmail.com>
date Thu, 17 Sep 2020 16:42:14 +0100
parent 9645:cc642c9c5ad5
child 10111:0f335815244f
child 11555:65dcc175ef5b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 = module:shared("sessions");
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20 local transfers = module:shared("transfers");
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21 local max_buffer_size = 4096;
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22
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23 local listener = {};
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24
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25 function listener.onincoming(conn, data)
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26 local session = sessions[conn] or {};
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27
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28 local transfer = transfers[session.sha];
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29 if transfer and transfer.activated then -- copy data between initiator and target
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30 local initiator, target = transfer.initiator, transfer.target;
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31 (conn == initiator and target or initiator):write(data);
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32 return;
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33 end -- FIXME server.link should be doing this?
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34
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35 if not session.greeting_done then
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36 local nmethods = data:byte(2) or 0;
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37 if data:byte(1) == 0x05 and nmethods > 0 and #data == 2 + nmethods then -- check if we have all the data
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38 if data:find("%z") then -- 0x00 = 'No authentication' is supported
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39 session.greeting_done = true;
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40 sessions[conn] = session;
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41 conn:write("\5\0"); -- send (SOCKS version 5, No authentication)
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42 module:log("debug", "SOCKS5 greeting complete");
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43 return;
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44 end
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45 end -- else error, unexpected input
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46 conn:write("\5\255"); -- send (SOCKS version 5, no acceptable method)
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47 conn:close();
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48 module:log("debug", "Invalid SOCKS5 greeting received: '%s'", b64(data));
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49 else -- connection request
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50 --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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51 if #data == 47 and data:sub(1,5) == "\5\1\0\3\40" and data:sub(-2) == "\0\0" then
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52 local sha = data:sub(6, 45);
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53 conn:pause();
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54 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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55 if not transfers[sha] then
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56 transfers[sha] = {};
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57 transfers[sha].target = conn;
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58 session.sha = sha;
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59 module:log("debug", "SOCKS5 target connected for session %s", sha);
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60 else -- transfers[sha].target ~= nil
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61 transfers[sha].initiator = conn;
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62 session.sha = sha;
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63 module:log("debug", "SOCKS5 initiator connected for session %s", sha);
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64 server.link(conn, transfers[sha].target, max_buffer_size);
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65 server.link(transfers[sha].target, conn, max_buffer_size);
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66 end
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67 else -- error, unexpected input
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68 conn:write("\5\1\0\3\0\0\0"); -- VER, REP, RSV, ATYP, BND.ADDR (sha), BND.PORT (2 Byte)
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69 conn:close();
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70 module:log("debug", "Invalid SOCKS5 negotiation received: '%s'", b64(data));
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71 end
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72 end
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73 end
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74
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75 function listener.ondisconnect(conn)
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76 local session = sessions[conn];
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77 if session then
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78 if transfers[session.sha] then
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79 local initiator, target = transfers[session.sha].initiator, transfers[session.sha].target;
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80 if initiator == conn and target ~= nil then
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81 target:close();
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82 elseif target == conn and initiator ~= nil then
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83 initiator:close();
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84 end
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85 transfers[session.sha] = nil;
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86 end
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87 -- Clean up any session-related stuff here
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88 sessions[conn] = nil;
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89 end
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90 end
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91
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92 function module.add_host(module)
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93 local host, name = module:get_host(), module:get_option_string("name", "SOCKS5 Bytestreams Service");
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94
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95 local proxy_address = module:get_option_string("proxy65_address", host);
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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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124
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125 local proxy_port = next(portmanager.get_active_services():search("proxy65", nil)[1] or {});
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126 if not proxy_port then
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127 module:log("warn", "Not listening on any port");
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128 origin.send(st.error_reply(stanza, "wait", "item-not-found", "Not listening on any port"));
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129 return true;
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130 end
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131
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132 local sid = stanza.tags[1].attr.sid;
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133 origin.send(st.reply(stanza):tag("query", {xmlns="http://jabber.org/protocol/bytestreams", sid=sid})
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134 :tag("streamhost", {jid=host, host=proxy_address, port=("%d"):format(proxy_port)}));
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135 return true;
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136 end);
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137
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138 module:hook("iq-set/host/http://jabber.org/protocol/bytestreams:query", function(event)
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139 local origin, stanza = event.origin, event.stanza;
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140
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141 local query = stanza.tags[1];
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142 local sid = query.attr.sid;
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143 local from = stanza.attr.from;
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144 local to = query:get_child_text("activate");
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145 local prepped_to = jid_prep(to);
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146
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147 local info = "sid: "..tostring(sid)..", initiator: "..tostring(from)..", target: "..tostring(prepped_to or to);
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148 if prepped_to and sid then
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149 local sha = sha1(sid .. from .. prepped_to, true);
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150 if not transfers[sha] then
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151 module:log("debug", "Activation request has unknown session id; activation failed (%s)", info);
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152 origin.send(st.error_reply(stanza, "modify", "item-not-found"));
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153 elseif not transfers[sha].initiator then
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154 module:log("debug", "The sender was not connected to the proxy; activation failed (%s)", info);
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155 origin.send(st.error_reply(stanza, "cancel", "not-allowed", "The sender (you) is not connected to the proxy"));
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156 --elseif not transfers[sha].target then -- can't happen, as target is set when a transfer object is created
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157 -- module:log("debug", "The recipient was not connected to the proxy; activation failed (%s)", info);
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158 -- origin.send(st.error_reply(stanza, "cancel", "not-allowed", "The recipient is not connected to the proxy"));
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diff changeset
159 else -- if transfers[sha].initiator ~= nil and transfers[sha].target ~= nil then
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160 module:log("debug", "Transfer activated (%s)", info);
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161 transfers[sha].activated = true;
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162 transfers[sha].target:resume();
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163 transfers[sha].initiator:resume();
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164 origin.send(st.reply(stanza));
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165 end
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166 elseif to and sid then
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167 module:log("debug", "Malformed activation jid; activation failed (%s)", info);
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168 origin.send(st.error_reply(stanza, "modify", "jid-malformed"));
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169 else
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170 module:log("debug", "Bad request; activation failed (%s)", info);
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171 origin.send(st.error_reply(stanza, "modify", "bad-request"));
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172 end
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173 return true;
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174 end);
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parents:
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175 end
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parents:
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176
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177 module:provides("net", {
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178 default_port = 5000;
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179 listener = listener;
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180 multiplex = {
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181 pattern = "^\5";
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182 };
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183 });