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mod_compression: More robust stanza processing.
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Remove version number from copyright headers
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1 | -- Prosody IM |
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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 | |
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10 | local hosts = _G.hosts; |
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11 | |
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12 | local t_concat = table.concat; |
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13 | |
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14 | local lxp = require "lxp"; |
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15 | local logger = require "util.logger"; |
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16 | local config = require "core.configmanager"; |
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17 | local connlisteners = require "net.connlisteners"; |
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18 | local cm_register_component = require "core.componentmanager".register_component; |
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19 | local cm_deregister_component = require "core.componentmanager".deregister_component; |
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20 | local uuid_gen = require "util.uuid".generate; |
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21 | local sha1 = require "util.hashes".sha1; |
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22 | local st = require "util.stanza"; |
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23 | local init_xmlhandlers = require "core.xmlhandlers"; |
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24 | |
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25 | local sessions = {}; |
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26 | |
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27 | local log = logger.init("componentlistener"); |
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28 | |
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29 | 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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30 | |
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31 | local xmlns_component = 'jabber:component:accept'; |
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32 | |
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33 | --- Callbacks/data for xmlhandlers to handle streams for us --- |
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34 | |
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35 | local stream_callbacks = { stream_tag = "http://etherx.jabber.org/streams\1stream", default_ns = xmlns_component }; |
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36 | |
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37 | function stream_callbacks.error(session, error, data, data2) |
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38 | log("warn", "Error processing component stream: "..tostring(error)); |
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39 | if error == "no-stream" then |
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40 | session:close("invalid-namespace"); |
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41 | elseif error == "xml-parse-error" and data == "unexpected-element-close" then |
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42 | session.log("warn", "Unexpected close of '%s' tag", data2); |
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43 | session:close("xml-not-well-formed"); |
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44 | else |
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45 | session.log("warn", "External component %s XML parse error: %s", tostring(session.host), tostring(error)); |
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46 | session:close("xml-not-well-formed"); |
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47 | end |
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48 | end |
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49 | |
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50 | function stream_callbacks.streamopened(session, attr) |
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51 | if config.get(attr.to, "core", "component_module") ~= "component" then |
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52 | -- Trying to act as a component domain which |
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53 | -- hasn't been configured |
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54 | session:close{ condition = "host-unknown", text = tostring(attr.to).." does not match any configured external components" }; |
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55 | return; |
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56 | end |
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57 | |
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58 | -- Store the original host (this is used for config, etc.) |
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59 | session.user = attr.to; |
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60 | -- Set the host for future reference |
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61 | session.host = config.get(attr.to, "core", "component_address") or attr.to; |
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62 | -- Note that we don't create the internal component |
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63 | -- until after the external component auths successfully |
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64 | |
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65 | session.streamid = uuid_gen(); |
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66 | session.notopen = nil; |
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67 | |
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68 | session.send(st.stanza("stream:stream", { xmlns=xmlns_component, |
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69 | ["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.host }):top_tag()); |
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70 | |
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71 | end |
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72 | |
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73 | function stream_callbacks.streamclosed(session) |
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74 | session.send("</stream:stream>"); |
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75 | session.notopen = true; |
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76 | end |
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77 | |
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78 | local core_process_stanza = core_process_stanza; |
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79 | |
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80 | function stream_callbacks.handlestanza(session, stanza) |
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81 | -- Namespaces are icky. |
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82 | if not stanza.attr.xmlns and stanza.name == "handshake" then |
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83 | stanza.attr.xmlns = xmlns_component; |
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84 | end |
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85 | return core_process_stanza(session, stanza); |
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86 | end |
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87 | |
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88 | --- Closing a component connection |
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89 | local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'}; |
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90 | local default_stream_attr = { ["xmlns:stream"] = stream_callbacks.stream_tag:match("[^\1]*"), xmlns = stream_callbacks.default_ns, version = "1.0", id = "" }; |
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91 | local function session_close(session, reason) |
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92 | local log = session.log or log; |
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93 | if session.conn then |
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94 | if session.notopen then |
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95 | session.send("<?xml version='1.0'?>"); |
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96 | session.send(st.stanza("stream:stream", default_stream_attr):top_tag()); |
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97 | end |
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98 | if reason then |
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99 | if type(reason) == "string" then -- assume stream error |
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100 | log("info", "Disconnecting component, <stream:error> is: %s", reason); |
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101 | session.send(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' })); |
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102 | elseif type(reason) == "table" then |
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103 | if reason.condition then |
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104 | local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up(); |
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105 | if reason.text then |
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106 | stanza:tag("text", stream_xmlns_attr):text(reason.text):up(); |
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107 | end |
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108 | if reason.extra then |
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109 | stanza:add_child(reason.extra); |
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110 | end |
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111 | log("info", "Disconnecting component, <stream:error> is: %s", tostring(stanza)); |
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112 | session.send(stanza); |
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113 | elseif reason.name then -- a stanza |
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114 | log("info", "Disconnecting component, <stream:error> is: %s", tostring(reason)); |
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115 | session.send(reason); |
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116 | end |
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117 | end |
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118 | end |
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119 | session.send("</stream:stream>"); |
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120 | session.conn.close(); |
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121 | component_listener.disconnect(session.conn, "stream error"); |
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122 | end |
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123 | end |
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124 | |
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125 | --- Component connlistener |
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126 | function component_listener.listener(conn, data) |
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127 | local session = sessions[conn]; |
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128 | if not session then |
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129 | local _send = conn.write; |
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130 | session = { type = "component", conn = conn, send = function (data) return _send(tostring(data)); end }; |
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131 | sessions[conn] = session; |
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132 | |
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133 | -- Logging functions -- |
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134 | |
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135 | local conn_name = "jcp"..tostring(conn):match("[a-f0-9]+$"); |
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136 | session.log = logger.init(conn_name); |
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137 | session.close = session_close; |
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138 | |
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139 | session.log("info", "Incoming Jabber component connection"); |
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140 | |
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141 | local parser = lxp.new(init_xmlhandlers(session, stream_callbacks), "\1"); |
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142 | session.parser = parser; |
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143 | |
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144 | session.notopen = true; |
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145 | |
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146 | function session.data(conn, data) |
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147 | local ok, err = parser:parse(data); |
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148 | if ok then return; end |
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149 | session:close("xml-not-well-formed"); |
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150 | end |
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151 | |
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152 | session.dispatch_stanza = stream_callbacks.handlestanza; |
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153 | |
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154 | end |
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155 | if data then |
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156 | session.data(conn, data); |
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157 | end |
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158 | end |
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159 | |
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160 | function component_listener.disconnect(conn, err) |
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161 | local session = sessions[conn]; |
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162 | if session then |
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163 | (session.log or log)("info", "component disconnected: %s (%s)", tostring(session.host), tostring(err)); |
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164 | if session.host then |
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165 | log("debug", "Deregistering component"); |
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166 | cm_deregister_component(session.host); |
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167 | hosts[session.host].connected = nil; |
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168 | end |
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169 | sessions[conn] = nil; |
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170 | for k in pairs(session) do session[k] = nil; end |
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171 | session = nil; |
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172 | end |
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173 | end |
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174 | |
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175 | connlisteners.register('xmppcomponent', component_listener); |