prosody
71fce47dff7b
plugins/mod_component.lua

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plugins/mod_component.lua @ 981:71fce47dff7b

mod_component: Deregister component on disconnect
author Matthew Wild <mwild1@gmail.com>
date Sat, 11 Apr 2009 22:22:24 +0100
parent 979:d0fd49c4339c
child 1042:a3d77353c18a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 -- Prosody IM v0.4
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2 -- Copyright (C) 2008-2009 Matthew Wild
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3 -- Copyright (C) 2008-2009 Waqas Hussain
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4 --
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9 if module:get_host_type() ~= "component" then
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10 error("Don't load mod_component manually, it should be for a component, please see http://prosody.im/doc/components", 0);
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11 end
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12
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13 local t_concat = table.concat;
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14
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15 local connlisteners = require "net.connlisteners";
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16 local cm_register_component = require "core.componentmanager".register_component;
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17 local cm_deregister_component = require "core.componentmanager".deregister_component;
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18 local uuid_gen = require "util.uuid".generate;
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19 local sha1 = require "util.hashes".sha1;
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20 local st = stanza;
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21 local init_xmlhandlers = require "core.xmlhandlers";
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22
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23 local sessions = {};
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24
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25 local log = module._log;
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26
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27 local component_listener = { default_port = 5347; default_mode = "*a"; default_interface = config.get("*", "core", "component_interface") or "127.0.0.1" };
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28
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29 local xmlns_component = 'jabber:component:accept';
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30
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31 --- Callbacks/data for xmlhandlers to handle streams for us ---
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32
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33 local stream_callbacks = { stream_tag = "http://etherx.jabber.org/streams|stream", default_ns = xmlns_component };
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34
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35 function stream_callbacks.error(session, error, data, data2)
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36 log("warn", "Error processing component stream: "..tostring(error));
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37 if error == "no-stream" then
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38 session:close("invalid-namespace");
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39 elseif error == "xml-parse-error" and data == "unexpected-element-close" then
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40 session.log("debug", "Unexpected close of '%s' tag", data2);
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41 session:close("xml-not-well-formed");
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42 else
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43 session.log("debug", "External component %s XML parse error: %s", tostring(session.host), tostring(error));
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44 print(data, debug.traceback())
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45 session:close("xml-not-well-formed");
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46 end
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47 end
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48
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49 function stream_callbacks.streamopened(session, attr)
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50 if config.get(attr.to, "core", "component_module") ~= "component" then
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51 -- Trying to act as a component domain which
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52 -- hasn't been configured
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53 session:close{ condition = "host-unknown", text = tostring(attr.to).." does not match any configured external components" };
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54 return;
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55 end
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56
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57 -- Store the original host (this is used for config, etc.)
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58 session.user = attr.to;
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59 -- Set the host for future reference
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60 session.host = config.get(attr.to, "core", "component_address") or attr.to;
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61 -- Note that we don't create the internal component
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62 -- until after the external component auths successfully
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63
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64 session.streamid = uuid_gen();
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65 session.notopen = nil;
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66
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67 session.send(st.stanza("stream:stream", { xmlns=xmlns_component,
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68 ["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.host }):top_tag());
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69
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70 end
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71
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72 function stream_callbacks.streamclosed(session)
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73 session.send("</stream:stream>");
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74 session.notopen = true;
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75 end
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76
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77 local core_process_stanza = core_process_stanza;
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78
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79 function stream_callbacks.handlestanza(session, stanza)
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80 -- Namespaces are icky.
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81 log("warn", "Handing stanza with name %s", stanza.name);
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82 if stanza.name ~= "handshake" then
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83 return core_process_stanza(session, stanza);
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84 else
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85 handle_component_auth(session, stanza);
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86 end
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87 end
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88
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89 --- Handle authentication attempts by components
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90 function handle_component_auth(session, stanza)
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91 if (not session.host) or #stanza.tags > 0 then
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92 session:close("not-authorized");
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93 return;
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94 end
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95
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96 local secret = config.get(session.user, "core", "component_secret");
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97 if not secret then
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98 log("warn", "Component attempted to identify as %s, but component_password is not set", session.user);
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99 session:close("not-authorized");
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100 return;
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101 end
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102
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103 local supplied_token = t_concat(stanza);
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104 local calculated_token = sha1(session.streamid..secret, true);
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105 if supplied_token:lower() ~= calculated_token:lower() then
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106 session:close{ condition = "not-authorized", text = "Given token does not match calculated token" };
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107 return;
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108 end
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109
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110
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111 -- Authenticated now
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112
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113 -- If component not already created for this host, create one now
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114 if not hosts[session.host].connected then
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115 local send = session.send;
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116 session.component_session = cm_register_component(session.host, function (_, data) return send(data); end);
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117 hosts[session.host].connected = true;
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118 else
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119 log("error", "Multiple components bound to the same address, first one wins (TODO: Implement stanza distribution)");
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120 end
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121
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122 -- Signal successful authentication
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123 session.send(st.stanza("handshake"));
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124 end
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125
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126 module:add_handler("component", "handshake", xmlns_component, handle_component_auth);
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127
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128 --- Closing a component connection
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129 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
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130 local function session_close(session, reason)
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131 local log = session.log or log;
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132 if session.conn then
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133 if reason then
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134 if type(reason) == "string" then -- assume stream error
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135 log("info", "Disconnecting component, <stream:error> is: %s", reason);
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136 session.send(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
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137 elseif type(reason) == "table" then
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138 if reason.condition then
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139 local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
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140 if reason.text then
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141 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
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142 end
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143 if reason.extra then
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144 stanza:add_child(reason.extra);
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145 end
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146 log("info", "Disconnecting component, <stream:error> is: %s", tostring(stanza));
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147 session.send(stanza);
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148 elseif reason.name then -- a stanza
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149 log("info", "Disconnecting component, <stream:error> is: %s", tostring(reason));
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150 session.send(reason);
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151 end
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152 end
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153 end
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154 session.send("</stream:stream>");
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155 session.conn.close();
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156 component_listener.disconnect(session.conn, "stream error");
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157 end
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158 end
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159
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160 --- Component connlistener
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161 function component_listener.listener(conn, data)
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162 local session = sessions[conn];
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163 if not session then
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164 local _send = conn.write;
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165 session = { type = "component", conn = conn, send = function (data) return _send(tostring(data)); end };
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166 sessions[conn] = session;
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167
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168 -- Logging functions --
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169
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170 local conn_name = "xep114-"..tostring(conn):match("[a-f0-9]+$");
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171 session.log = logger.init(conn_name);
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172 session.close = session_close;
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173
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174 session.log("info", "Incoming XEP-0114 connection");
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175
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176 local parser = lxp.new(init_xmlhandlers(session, stream_callbacks), "|");
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177 session.parser = parser;
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178
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179 session.notopen = true;
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180
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181 function session.data(conn, data)
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182 local ok, err = parser:parse(data);
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183 if ok then return; end
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184 session:close("xml-not-well-formed");
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185 end
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186
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187 session.dispatch_stanza = stream_callbacks.handlestanza;
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188
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189 end
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190 if data then
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191 session.data(conn, data);
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192 end
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193 end
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194
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195 function component_listener.disconnect(conn, err)
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196 local session = sessions[conn];
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197 if session then
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198 (session.log or log)("info", "component disconnected: %s (%s)", tostring(session.host), tostring(err));
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199 if session.host then
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200 log("debug", "deregistering component");
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201 cm_deregister_component(session.host);
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202 hosts[session.host].connected = nil;
902
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203 end
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204 sessions[conn] = nil;
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205 session = nil;
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206 collectgarbage("collect");
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207 end
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208 end
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209
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210 connlisteners.register('component', component_listener);
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211
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212 module:add_event_hook("server-started",
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213 function ()
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214 if net_activate_ports then
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215 net_activate_ports("component", "component", {5437}, "tcp");
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216 else
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217 error("No net_activate_ports: Using an incompatible version of Prosody?");
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218 end
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219 end);