Annotate

plugins/mod_proxy65.lua @ 4393:7958680c459a

net.server_select: Minor whitespace fix.
author Waqas Hussain <waqas20@gmail.com>
date Thu, 13 Oct 2011 00:11:17 +0500
parent 4376:99277a1abe58
child 4414:aa2e79f20962
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 -- Copyright (C) 2009 Thilo Cestonaro
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2 --
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3 -- This project is MIT/X11 licensed. Please see the
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4 -- COPYING file in the source package for more information.
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5 --
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6 --[[
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7 * to restart the proxy in the console: e.g.
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8 module:unload("proxy65");
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9 > server.removeserver(<proxy65_port>);
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10 module:load("proxy65", <proxy65_jid>);
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11 ]]--
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12
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13
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14 local module = module;
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15 local tostring = tostring;
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16 local jid_compare, jid_prep = require "util.jid".compare, require "util.jid".prep;
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17 local st = require "util.stanza";
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18 local connlisteners = require "net.connlisteners";
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19 local sha1 = require "util.hashes".sha1;
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20 local server = require "net.server";
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21
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22 local host, name = module:get_host(), "SOCKS5 Bytestreams Service";
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23 local sessions, transfers = {}, {};
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24
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25 local proxy_port = module:get_option("proxy65_port") or 5000;
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26 local proxy_interface = module:get_option("proxy65_interface") or "*";
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27 local proxy_address = module:get_option("proxy65_address") or (proxy_interface ~= "*" and proxy_interface) or host;
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28 local proxy_acl = module:get_option("proxy65_acl");
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29 local max_buffer_size = 4096;
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30
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31 local connlistener = { default_port = proxy_port, default_interface = proxy_interface, default_mode = "*a" };
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32
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33 function connlistener.onincoming(conn, data)
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34 local session = sessions[conn] or {};
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35
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36 if session.setup == nil and data ~= nil and data:byte(1) == 0x05 and #data > 2 then
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37 local nmethods = data:byte(2);
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38 local methods = data:sub(3);
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39 local supported = false;
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40 for i=1, nmethods, 1 do
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41 if(methods:byte(i) == 0x00) then -- 0x00 == method: NO AUTH
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42 supported = true;
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43 break;
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44 end
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45 end
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46 if(supported) then
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47 module:log("debug", "new session found ... ")
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48 session.setup = true;
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49 sessions[conn] = session;
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50 conn:write(string.char(5, 0));
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51 end
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52 return;
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53 end
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54 if session.setup then
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55 if session.sha ~= nil and transfers[session.sha] ~= nil then
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56 local sha = session.sha;
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57 if transfers[sha].activated == true and transfers[sha].target ~= nil then
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58 if transfers[sha].initiator == conn then
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59 transfers[sha].target:write(data);
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60 else
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61 transfers[sha].initiator:write(data);
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62 end
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63 return;
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64 end
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65 end
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66 if data ~= nil and #data == 0x2F and -- 40 == length of SHA1 HASH, and 7 other bytes => 47 => 0x2F
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67 data:byte(1) == 0x05 and -- SOCKS5 has 5 in first byte
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68 data:byte(2) == 0x01 and -- CMD must be 1
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69 data:byte(3) == 0x00 and -- RSV must be 0
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70 data:byte(4) == 0x03 and -- ATYP must be 3
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71 data:byte(5) == 40 and -- SHA1 HASH length must be 40 (0x28)
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72 data:byte(-2) == 0x00 and -- PORT must be 0, size 2 byte
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73 data:byte(-1) == 0x00
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74 then
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75 local sha = data:sub(6, 45); -- second param is not count! it's the ending index (included!)
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76 if transfers[sha] == nil then
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77 transfers[sha] = {};
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78 transfers[sha].activated = false;
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79 transfers[sha].target = conn;
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80 session.sha = sha;
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81 module:log("debug", "target connected ... ");
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82 elseif transfers[sha].target ~= nil then
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83 transfers[sha].initiator = conn;
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84 session.sha = sha;
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85 module:log("debug", "initiator connected ... ");
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86 server.link(conn, transfers[sha].target, max_buffer_size);
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87 server.link(transfers[sha].target, conn, max_buffer_size);
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88 end
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89 conn:write(string.char(5, 0, 0, 3, #sha) .. sha .. string.char(0, 0)); -- VER, REP, RSV, ATYP, BND.ADDR (sha), BND.PORT (2 Byte)
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90 conn:lock_read(true)
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91 else
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92 module:log("warn", "Neither data transfer nor initial connect of a participator of a transfer.")
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93 conn:close();
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94 end
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95 else
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96 if data ~= nil then
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97 module:log("warn", "unknown connection with no authentication data -> closing it");
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98 conn:close();
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99 end
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100 end
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101 end
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102
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103 function connlistener.ondisconnect(conn, err)
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104 local session = sessions[conn];
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105 if session then
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106 if session.sha and transfers[session.sha] then
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107 local initiator, target = transfers[session.sha].initiator, transfers[session.sha].target;
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108 if initiator == conn and target ~= nil then
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109 target:close();
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110 elseif target == conn and initiator ~= nil then
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111 initiator:close();
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112 end
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113 transfers[session.sha] = nil;
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114 end
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115 -- Clean up any session-related stuff here
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116 sessions[conn] = nil;
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117 end
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118 end
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119
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120 module:add_identity("proxy", "bytestreams", name);
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121 module:add_feature("http://jabber.org/protocol/bytestreams");
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122
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123 module:hook("iq-get/host/http://jabber.org/protocol/disco#info:query", function(event)
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124 local origin, stanza = event.origin, event.stanza;
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125 origin.send(st.reply(stanza):query("http://jabber.org/protocol/disco#info")
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126 :tag("identity", {category='proxy', type='bytestreams', name=name}):up()
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127 :tag("feature", {var="http://jabber.org/protocol/bytestreams"}) );
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128 return true;
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129 end, -1);
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130
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131 module:hook("iq-get/host/http://jabber.org/protocol/disco#items:query", function(event)
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132 local origin, stanza = event.origin, event.stanza;
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133 origin.send(st.reply(stanza):query("http://jabber.org/protocol/disco#items"));
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134 return true;
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135 end, -1);
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136
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137 module:hook("iq-get/host/http://jabber.org/protocol/bytestreams:query", function(event)
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138 local origin, stanza = event.origin, event.stanza;
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139
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140 -- check ACL
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141 while proxy_acl and #proxy_acl > 0 do -- using 'while' instead of 'if' so we can break out of it
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142 local jid = stanza.attr.from;
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143 for _, acl in ipairs(proxy_acl) do
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144 if jid_compare(jid, acl) then break; end
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145 end
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146 module:log("warn", "Denying use of proxy for %s", tostring(stanza.attr.from));
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147 origin.send(st.error_reply(stanza, "auth", "forbidden"));
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148 return true;
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149 end
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150
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151 local sid = stanza.tags[1].attr.sid;
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152 origin.send(st.reply(stanza):tag("query", {xmlns="http://jabber.org/protocol/bytestreams", sid=sid})
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153 :tag("streamhost", {jid=host, host=proxy_address, port=proxy_port}));
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154 return true;
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155 end);
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156
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157 module.unload = function()
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158 connlisteners.deregister(module.host .. ':proxy65');
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159 end
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160
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161 module:hook("iq-set/host/http://jabber.org/protocol/bytestreams:query", function(event)
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162 local origin, stanza = event.origin, event.stanza;
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163
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164 local query = stanza.tags[1];
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165 local sid = query.attr.sid;
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166 local from = stanza.attr.from;
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167 local to = query:get_child_text("activate");
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168 local prepped_to = jid_prep(to);
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169
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170 module:log("debug", "received activation request from %s", stanza.attr.from);
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171 if prepped_to and sid then
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172 local sha = sha1(sid .. from .. prepped_to, true);
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173 if transfers[sha] == nil then
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174 module:log("error", "transfers[sha]: nil");
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175 origin.send(st.error_reply(stanza, "modify", "item-not-found"));
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176 elseif(transfers[sha] ~= nil and transfers[sha].initiator ~= nil and transfers[sha].target ~= nil) then
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177 transfers[sha].activated = true;
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178 transfers[sha].target:lock_read(false);
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179 transfers[sha].initiator:lock_read(false);
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180 origin.send(st.reply(stanza));
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181 else
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182 module:log("debug", "Both parties were not yet connected");
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183 local message = "Neither party is connected to the proxy";
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184 if transfers[sha].initiator then
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185 message = "The recipient is not connected to the proxy";
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186 elseif transfers[sha].target then
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187 message = "The sender (you) is not connected to the proxy";
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188 end
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189 origin.send(st.error_reply(stanza, "cancel", "not-allowed", message));
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190 end
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191 elseif to and sid then
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192 origin.send(st.error_reply(stanza, "modify", "jid-malformed"));
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193 else
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194 module:log("error", "activation failed: sid: %s, initiator: %s, target: %s", tostring(sid), tostring(from), tostring(to));
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195 origin.send(st.error_reply(stanza, "modify", "bad-request"));
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196 end
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197 return true;
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198 end);
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199
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200 if not connlisteners.register(module.host .. ':proxy65', connlistener) then
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201 module:log("error", "mod_proxy65: Could not establish a connection listener. Check your configuration please.");
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202 module:log("error", "Possibly two proxy65 components are configured to share the same port.");
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203 end
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204
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205 connlisteners.start(module.host .. ':proxy65');