prosody
70275ab52ab2
plugins/mod_proxy65.lua

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plugins/mod_proxy65.lua @ 4451:70275ab52ab2

configure: Add 'openbsd' preset (thanks xavier)
author Matthew Wild <mwild1@gmail.com>
date Sun, 11 Dec 2011 17:08:34 +0000
parent 4414:aa2e79f20962
child 4679:5b52b5eaa03d
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 * to restart the proxy in the console: e.g.
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11 module:unload("proxy65");
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12 > server.removeserver(<proxy65_port>);
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13 module:load("proxy65", <proxy65_jid>);
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14 ]]--
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15
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16
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17 local module = module;
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18 local tostring = tostring;
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19 local jid_compare, jid_prep = require "util.jid".compare, require "util.jid".prep;
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20 local st = require "util.stanza";
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21 local connlisteners = require "net.connlisteners";
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22 local sha1 = require "util.hashes".sha1;
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23 local server = require "net.server";
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24 local b64 = require "util.encodings".base64.encode;
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25
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26 local host, name = module:get_host(), "SOCKS5 Bytestreams Service";
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27 local sessions, transfers = {}, {};
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28
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29 local proxy_port = module:get_option("proxy65_port") or 5000;
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30 local proxy_interface = module:get_option("proxy65_interface") or "*";
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31 local proxy_address = module:get_option("proxy65_address") or (proxy_interface ~= "*" and proxy_interface) or host;
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32 local proxy_acl = module:get_option("proxy65_acl");
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33 local max_buffer_size = 4096;
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34
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35 local connlistener = { default_port = proxy_port, default_interface = proxy_interface, default_mode = "*a" };
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36
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37 function connlistener.onincoming(conn, data)
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38 local session = sessions[conn] or {};
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39
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40 local transfer = transfers[session.sha];
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41 if transfer and transfer.activated then -- copy data between initiator and target
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42 local initiator, target = transfer.initiator, transfer.target;
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43 (conn == initiator and target or initiator):write(data);
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44 return;
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45 end -- FIXME server.link should be doing this?
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46
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47 if not session.greeting_done then
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48 local nmethods = data:byte(2) or 0;
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49 if data:byte(1) == 0x05 and nmethods > 0 and #data == 2 + nmethods then -- check if we have all the data
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50 if data:find("%z") then -- 0x00 = 'No authentication' is supported
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51 session.greeting_done = true;
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52 sessions[conn] = session;
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53 conn:write("\5\0"); -- send (SOCKS version 5, No authentication)
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54 module:log("debug", "SOCKS5 greeting complete");
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55 return;
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56 end
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57 end -- else error, unexpected input
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58 conn:write("\5\255"); -- send (SOCKS version 5, no acceptable method)
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59 conn:close();
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60 module:log("debug", "Invalid SOCKS5 greeting recieved: '%s'", b64(data));
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61 else -- connection request
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62 --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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63 if #data == 47 and data:sub(1,5) == "\5\1\0\3\40" and data:sub(-2) == "\0\0" then
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64 local sha = data:sub(6, 45);
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65 conn:pause();
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66 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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67 if not transfers[sha] then
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68 transfers[sha] = {};
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69 transfers[sha].target = conn;
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70 session.sha = sha;
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71 module:log("debug", "SOCKS5 target connected for session %s", sha);
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72 else -- transfers[sha].target ~= nil
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73 transfers[sha].initiator = conn;
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74 session.sha = sha;
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75 module:log("debug", "SOCKS5 initiator connected for session %s", sha);
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76 server.link(conn, transfers[sha].target, max_buffer_size);
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77 server.link(transfers[sha].target, conn, max_buffer_size);
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78 end
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79 else -- error, unexpected input
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80 conn:write("\5\1\0\3\0\0\0"); -- VER, REP, RSV, ATYP, BND.ADDR (sha), BND.PORT (2 Byte)
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81 conn:close();
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82 module:log("debug", "Invalid SOCKS5 negotiation recieved: '%s'", b64(data));
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83 end
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84 end
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85 end
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86
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87 function connlistener.ondisconnect(conn, err)
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88 local session = sessions[conn];
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89 if session then
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90 if transfers[session.sha] then
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91 local initiator, target = transfers[session.sha].initiator, transfers[session.sha].target;
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92 if initiator == conn and target ~= nil then
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93 target:close();
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94 elseif target == conn and initiator ~= nil then
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95 initiator:close();
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96 end
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97 transfers[session.sha] = nil;
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98 end
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99 -- Clean up any session-related stuff here
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100 sessions[conn] = nil;
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101 end
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102 end
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103
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104 module:add_identity("proxy", "bytestreams", name);
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105 module:add_feature("http://jabber.org/protocol/bytestreams");
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106
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107 module:hook("iq-get/host/http://jabber.org/protocol/disco#info:query", function(event)
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108 local origin, stanza = event.origin, event.stanza;
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109 origin.send(st.reply(stanza):query("http://jabber.org/protocol/disco#info")
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110 :tag("identity", {category='proxy', type='bytestreams', name=name}):up()
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111 :tag("feature", {var="http://jabber.org/protocol/bytestreams"}) );
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112 return true;
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113 end, -1);
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114
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115 module:hook("iq-get/host/http://jabber.org/protocol/disco#items:query", function(event)
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116 local origin, stanza = event.origin, event.stanza;
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117 origin.send(st.reply(stanza):query("http://jabber.org/protocol/disco#items"));
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118 return true;
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119 end, -1);
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120
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121 module:hook("iq-get/host/http://jabber.org/protocol/bytestreams:query", function(event)
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122 local origin, stanza = event.origin, event.stanza;
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123
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124 -- check ACL
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125 while proxy_acl and #proxy_acl > 0 do -- using 'while' instead of 'if' so we can break out of it
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126 local jid = stanza.attr.from;
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127 for _, acl in ipairs(proxy_acl) do
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128 if jid_compare(jid, acl) then break; end
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129 end
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130 module:log("warn", "Denying use of proxy for %s", tostring(stanza.attr.from));
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131 origin.send(st.error_reply(stanza, "auth", "forbidden"));
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132 return true;
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133 end
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134
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135 local sid = stanza.tags[1].attr.sid;
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136 origin.send(st.reply(stanza):tag("query", {xmlns="http://jabber.org/protocol/bytestreams", sid=sid})
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137 :tag("streamhost", {jid=host, host=proxy_address, port=proxy_port}));
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138 return true;
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139 end);
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140
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141 module.unload = function()
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142 connlisteners.deregister(module.host .. ':proxy65');
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143 end
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144
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145 module:hook("iq-set/host/http://jabber.org/protocol/bytestreams:query", function(event)
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146 local origin, stanza = event.origin, event.stanza;
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147
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148 local query = stanza.tags[1];
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149 local sid = query.attr.sid;
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150 local from = stanza.attr.from;
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151 local to = query:get_child_text("activate");
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152 local prepped_to = jid_prep(to);
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153
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154 local info = "sid: "..tostring(sid)..", initiator: "..tostring(from)..", target: "..tostring(prepped_to or to);
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155 if prepped_to and sid then
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156 local sha = sha1(sid .. from .. prepped_to, true);
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157 if not transfers[sha] then
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158 module:log("debug", "Activation request has unknown session id; activation failed (%s)", info);
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159 origin.send(st.error_reply(stanza, "modify", "item-not-found"));
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160 elseif not transfers[sha].initiator then
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161 module:log("debug", "The sender was not connected to the proxy; activation failed (%s)", info);
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162 origin.send(st.error_reply(stanza, "cancel", "not-allowed", "The sender (you) is not connected to the proxy"));
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163 --elseif not transfers[sha].target then -- can't happen, as target is set when a transfer object is created
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164 -- module:log("debug", "The recipient was not connected to the proxy; activation failed (%s)", info);
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165 -- origin.send(st.error_reply(stanza, "cancel", "not-allowed", "The recipient is not connected to the proxy"));
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166 else -- if transfers[sha].initiator ~= nil and transfers[sha].target ~= nil then
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167 module:log("debug", "Transfer activated (%s)", info);
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168 transfers[sha].activated = true;
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169 transfers[sha].target:resume();
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170 transfers[sha].initiator:resume();
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171 origin.send(st.reply(stanza));
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172 end
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173 elseif to and sid then
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174 module:log("debug", "Malformed activation jid; activation failed (%s)", info);
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175 origin.send(st.error_reply(stanza, "modify", "jid-malformed"));
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176 else
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177 module:log("debug", "Bad request; activation failed (%s)", info);
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178 origin.send(st.error_reply(stanza, "modify", "bad-request"));
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179 end
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180 return true;
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181 end);
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182
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183 if not connlisteners.register(module.host .. ':proxy65', connlistener) then
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184 module:log("error", "mod_proxy65: Could not establish a connection listener. Check your configuration please.");
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185 module:log("error", "Possibly two proxy65 components are configured to share the same port.");
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186 end
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187
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188 connlisteners.start(module.host .. ':proxy65');