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plugins/mod_component.lua @ 7300:66e7517bd8f3
mod_component: Fire event when component disconnects
author | Matthew Wild <mwild1@gmail.com> |
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date | Fri, 18 Mar 2016 13:58:55 +0000 |
parent | 6913:c7a0d5299933 |
child | 7301:995777582044 |
rev | line source |
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1 -- Prosody IM |
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2 -- Copyright (C) 2008-2010 Matthew Wild |
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3 -- Copyright (C) 2008-2010 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 module:set_global(); |
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10 |
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11 local t_concat = table.concat; |
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12 local xpcall, tostring, type = xpcall, tostring, type; |
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mod_component: xpcall() stanza processing, as per other listeners, preventing potentially harmful 'top-level errors'
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13 local traceback = debug.traceback; |
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14 |
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15 local logger = require "util.logger"; |
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16 local sha1 = require "util.hashes".sha1; |
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mod_*: Fix a load of global accesses
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17 local st = require "util.stanza"; |
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18 |
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19 local jid_split = require "util.jid".split; |
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20 local new_xmpp_stream = require "util.xmppstream".new; |
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21 local uuid_gen = require "util.uuid".generate; |
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22 |
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mod_admin_adhoc, mod_admin_telnet, mod_bosh, mod_c2s, mod_component, mod_pep, mod_presence, mod_roster, mod_s2s: Import core_post_stanza from the global prosody table.
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23 local core_process_stanza = prosody.core_process_stanza; |
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mod_announce, mod_auth_anonymous, mod_c2s, mod_c2s, mod_component, mod_iq, mod_message, mod_presence, mod_tls: Access prosody.{hosts,bare_sessions,full_sessions} instead of the old globals
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24 local hosts = prosody.hosts; |
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25 |
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26 local log = module._log; |
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27 |
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28 local opt_keepalives = module:get_option_boolean("component_tcp_keepalives", module:get_option_boolean("tcp_keepalives", true)); |
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29 |
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30 local sessions = module:shared("sessions"); |
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31 |
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32 function module.add_host(module) |
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33 if module:get_host_type() ~= "component" then |
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34 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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35 end |
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36 |
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37 local env = module.environment; |
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38 env.connected = false; |
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39 env.session = false; |
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40 |
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41 local send; |
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42 |
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43 local function on_destroy(session, err) |
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44 env.connected = false; |
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45 env.session = false; |
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46 send = nil; |
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47 session.on_destroy = nil; |
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48 end |
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49 |
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50 -- Handle authentication attempts by component |
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51 local function handle_component_auth(event) |
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52 local session, stanza = event.origin, event.stanza; |
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53 |
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54 if session.type ~= "component_unauthed" then return; end |
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55 |
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56 if (not session.host) or #stanza.tags > 0 then |
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57 (session.log or log)("warn", "Invalid component handshake for host: %s", session.host); |
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58 session:close("not-authorized"); |
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59 return true; |
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60 end |
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61 |
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62 local secret = module:get_option("component_secret"); |
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63 if not secret then |
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64 (session.log or log)("warn", "Component attempted to identify as %s, but component_secret is not set", session.host); |
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65 session:close("not-authorized"); |
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66 return true; |
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67 end |
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68 |
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69 local supplied_token = t_concat(stanza); |
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70 local calculated_token = sha1(session.streamid..secret, true); |
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71 if supplied_token:lower() ~= calculated_token:lower() then |
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72 module:log("info", "Component authentication failed for %s", session.host); |
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73 session:close{ condition = "not-authorized", text = "Given token does not match calculated token" }; |
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74 return true; |
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75 end |
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76 |
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77 if env.connected then |
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78 local policy = module:get_option_string("component_conflict_resolve", "kick_new"); |
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79 if policy == "kick_old" then |
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80 env.session:close{ condition = "conflict", text = "Replaced by a new connection" }; |
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81 else -- kick_new |
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82 module:log("error", "Second component attempted to connect, denying connection"); |
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83 session:close{ condition = "conflict", text = "Component already connected" }; |
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84 return true; |
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85 end |
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86 end |
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87 |
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88 env.connected = true; |
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89 env.session = session; |
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90 send = session.send; |
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91 session.on_destroy = on_destroy; |
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92 session.component_validate_from = module:get_option_boolean("validate_from_addresses", true); |
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93 session.type = "component"; |
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94 module:log("info", "External component successfully authenticated"); |
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95 session.send(st.stanza("handshake")); |
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96 module:fire_event("component-authenticated", { session = session }); |
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97 |
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98 return true; |
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99 end |
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100 module:hook("stanza/jabber:component:accept:handshake", handle_component_auth, -1); |
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101 |
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102 -- Handle stanzas addressed to this component |
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103 local function handle_stanza(event) |
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104 local stanza = event.stanza; |
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105 if send then |
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106 stanza.attr.xmlns = nil; |
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107 send(stanza); |
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108 else |
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109 if stanza.name == "iq" and stanza.attr.type == "get" and stanza.attr.to == module.host then |
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110 local query = stanza.tags[1]; |
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111 local node = query.attr.node; |
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112 if query.name == "query" and query.attr.xmlns == "http://jabber.org/protocol/disco#info" and (not node or node == "") then |
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113 local name = module:get_option_string("name"); |
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114 if name then |
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115 event.origin.send(st.reply(stanza):tag("query", { xmlns = "http://jabber.org/protocol/disco#info" }) |
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116 :tag("identity", { category = "component", type = "generic", name = module:get_option_string("name", "Prosody") })) |
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117 return true; |
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118 end |
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119 end |
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120 end |
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121 module:log("warn", "Component not connected, bouncing error for: %s", stanza:top_tag()); |
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122 if stanza.attr.type ~= "error" and stanza.attr.type ~= "result" then |
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123 event.origin.send(st.error_reply(stanza, "wait", "service-unavailable", "Component unavailable")); |
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124 end |
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125 end |
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126 return true; |
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127 end |
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128 |
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129 module:hook("iq/bare", handle_stanza, -1); |
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130 module:hook("message/bare", handle_stanza, -1); |
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131 module:hook("presence/bare", handle_stanza, -1); |
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132 module:hook("iq/full", handle_stanza, -1); |
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133 module:hook("message/full", handle_stanza, -1); |
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134 module:hook("presence/full", handle_stanza, -1); |
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135 module:hook("iq/host", handle_stanza, -1); |
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136 module:hook("message/host", handle_stanza, -1); |
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137 module:hook("presence/host", handle_stanza, -1); |
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138 end |
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139 |
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140 --- Network and stream part --- |
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141 |
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142 local xmlns_component = 'jabber:component:accept'; |
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143 |
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144 local listener = {}; |
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145 |
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146 --- Callbacks/data for xmppstream to handle streams for us --- |
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147 |
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148 local stream_callbacks = { default_ns = xmlns_component }; |
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149 |
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150 local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams"; |
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151 |
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152 function stream_callbacks.error(session, error, data, data2) |
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153 if session.destroyed then return; end |
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154 module:log("warn", "Error processing component stream: %s", tostring(error)); |
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155 if error == "no-stream" then |
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156 session:close("invalid-namespace"); |
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157 elseif error == "parse-error" then |
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158 session.log("warn", "External component %s XML parse error: %s", tostring(session.host), tostring(data)); |
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159 session:close("not-well-formed"); |
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160 elseif error == "stream-error" then |
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161 local condition, text = "undefined-condition"; |
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162 for child in data:children() do |
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163 if child.attr.xmlns == xmlns_xmpp_streams then |
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164 if child.name ~= "text" then |
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165 condition = child.name; |
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166 else |
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167 text = child:get_text(); |
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168 end |
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169 if condition ~= "undefined-condition" and text then |
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170 break; |
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171 end |
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172 end |
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173 end |
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174 text = condition .. (text and (" ("..text..")") or ""); |
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175 session.log("info", "Session closed by remote with error: %s", text); |
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176 session:close(nil, text); |
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177 end |
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178 end |
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179 |
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180 function stream_callbacks.streamopened(session, attr) |
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181 if not hosts[attr.to] or not hosts[attr.to].modules.component then |
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182 session:close{ condition = "host-unknown", text = tostring(attr.to).." does not match any configured external components" }; |
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183 return; |
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184 end |
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185 session.host = attr.to; |
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186 session.streamid = uuid_gen(); |
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187 session.notopen = nil; |
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188 -- Return stream header |
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189 session:open_stream(); |
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190 end |
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191 |
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192 function stream_callbacks.streamclosed(session) |
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193 session.log("debug", "Received </stream:stream>"); |
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194 session:close(); |
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195 end |
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196 |
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197 local function handleerr(err) log("error", "Traceback[component]: %s", traceback(tostring(err), 2)); end |
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198 function stream_callbacks.handlestanza(session, stanza) |
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199 -- Namespaces are icky. |
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200 if not stanza.attr.xmlns and stanza.name == "handshake" then |
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201 stanza.attr.xmlns = xmlns_component; |
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202 end |
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203 if not stanza.attr.xmlns or stanza.attr.xmlns == "jabber:client" then |
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204 local from = stanza.attr.from; |
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205 if from then |
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206 if session.component_validate_from then |
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207 local _, domain = jid_split(stanza.attr.from); |
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208 if domain ~= session.host then |
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209 -- Return error |
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210 session.log("warn", "Component sent stanza with missing or invalid 'from' address"); |
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211 session:close{ |
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212 condition = "invalid-from"; |
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213 text = "Component tried to send from address <"..tostring(from) |
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214 .."> which is not in domain <"..tostring(session.host)..">"; |
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215 }; |
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216 return; |
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217 end |
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218 end |
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219 else |
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220 stanza.attr.from = session.host; -- COMPAT: Strictly we shouldn't allow this |
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221 end |
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222 if not stanza.attr.to then |
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223 session.log("warn", "Rejecting stanza with no 'to' address"); |
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224 session.send(st.error_reply(stanza, "modify", "bad-request", "Components MUST specify a 'to' address on stanzas")); |
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225 return; |
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226 end |
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227 end |
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228 |
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229 if stanza then |
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230 return xpcall(function () return core_process_stanza(session, stanza) end, handleerr); |
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231 end |
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232 end |
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233 |
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234 --- Closing a component connection |
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235 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'}; |
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236 local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" }; |
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237 local function session_close(session, reason) |
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238 if session.destroyed then return; end |
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239 if session.conn then |
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240 if session.notopen then |
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241 session.send("<?xml version='1.0'?>"); |
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242 session.send(st.stanza("stream:stream", default_stream_attr):top_tag()); |
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243 end |
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244 if reason then |
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245 if type(reason) == "string" then -- assume stream error |
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246 module:log("info", "Disconnecting component, <stream:error> is: %s", reason); |
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247 session.send(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' })); |
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248 elseif type(reason) == "table" then |
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249 if reason.condition then |
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250 local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up(); |
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251 if reason.text then |
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252 stanza:tag("text", stream_xmlns_attr):text(reason.text):up(); |
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253 end |
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254 if reason.extra then |
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255 stanza:add_child(reason.extra); |
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256 end |
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257 module:log("info", "Disconnecting component, <stream:error> is: %s", tostring(stanza)); |
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258 session.send(stanza); |
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259 elseif reason.name then -- a stanza |
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260 module:log("info", "Disconnecting component, <stream:error> is: %s", tostring(reason)); |
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261 session.send(reason); |
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262 end |
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263 end |
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264 end |
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265 session.send("</stream:stream>"); |
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266 session.conn:close(); |
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267 listener.ondisconnect(session.conn, "stream error"); |
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268 end |
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269 end |
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270 |
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271 --- Component connlistener |
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272 |
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273 function listener.onconnect(conn) |
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274 local _send = conn.write; |
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275 local session = { type = "component_unauthed", conn = conn, send = function (data) return _send(conn, tostring(data)); end }; |
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276 |
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277 -- Logging functions -- |
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278 local conn_name = "jcp"..tostring(session):match("[a-f0-9]+$"); |
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279 session.log = logger.init(conn_name); |
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280 session.close = session_close; |
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281 |
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282 if opt_keepalives then |
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283 conn:setoption("keepalive", opt_keepalives); |
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284 end |
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285 |
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286 session.log("info", "Incoming Jabber component connection"); |
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287 |
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288 local stream = new_xmpp_stream(session, stream_callbacks); |
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289 session.stream = stream; |
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290 |
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291 session.notopen = true; |
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292 |
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293 function session.reset_stream() |
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294 session.notopen = true; |
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295 session.stream:reset(); |
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296 end |
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297 |
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298 function session.data(conn, data) |
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299 local ok, err = stream:feed(data); |
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300 if ok then return; end |
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301 module:log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data, data:sub(1, 300):gsub("[\r\n]+", " "):gsub("[%z\1-\31]", "_")); |
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302 session:close("not-well-formed"); |
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303 end |
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304 |
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305 session.dispatch_stanza = stream_callbacks.handlestanza; |
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306 |
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307 sessions[conn] = session; |
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308 end |
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309 function listener.onincoming(conn, data) |
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310 local session = sessions[conn]; |
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311 session.data(conn, data); |
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312 end |
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313 function listener.ondisconnect(conn, err) |
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314 local session = sessions[conn]; |
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315 if session then |
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316 (session.log or log)("info", "component disconnected: %s (%s)", tostring(session.host), tostring(err)); |
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317 module:fire_event("component-disconnected", { session = session, reason = err }); |
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318 if session.on_destroy then session:on_destroy(err); end |
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319 sessions[conn] = nil; |
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320 for k in pairs(session) do |
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321 if k ~= "log" and k ~= "close" then |
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322 session[k] = nil; |
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323 end |
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324 end |
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325 session.destroyed = true; |
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326 session = nil; |
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327 end |
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328 end |
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329 |
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330 function listener.ondetach(conn) |
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331 sessions[conn] = nil; |
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332 end |
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333 |
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334 module:provides("net", { |
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335 name = "component"; |
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336 private = true; |
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337 listener = listener; |
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338 default_port = 5347; |
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339 multiplex = { |
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340 pattern = "^<.*:stream.*%sxmlns%s*=%s*(['\"])jabber:component:accept%1.*>"; |
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341 }; |
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342 }); |