net/xmppcomponent_listener.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2009 Matthew Wild
   3 -- Copyright (C) 2008-2009 Waqas Hussain
   4 --
   5 -- This project is MIT/X11 licensed. Please see the
   6 -- COPYING file in the source package for more information.
   7 --
   8
   9
  10 local hosts = _G.hosts;
  11
  12 local t_concat = table.concat;
  13
  14 local lxp = require "lxp";
  15 local logger = require "util.logger";
  16 local config = require "core.configmanager";
  17 local connlisteners = require "net.connlisteners";
  18 local cm_register_component = require "core.componentmanager".register_component;
  19 local cm_deregister_component = require "core.componentmanager".deregister_component;
  20 local uuid_gen = require "util.uuid".generate;
  21 local sha1 = require "util.hashes".sha1;
  22 local st = require "util.stanza";
  23 local init_xmlhandlers = require "core.xmlhandlers";
  24
  25 local sessions = {};
  26
  27 local log = logger.init("componentlistener");
  28
  29 local component_listener = { default_port = 5347; default_mode = "*a"; default_interface = config.get("*", "core", "component_interface") or "127.0.0.1" };
  30
  31 local xmlns_component = 'jabber:component:accept';
  32
  33 --- Callbacks/data for xmlhandlers to handle streams for us ---
  34
  35 local stream_callbacks = { stream_tag = "http://etherx.jabber.org/streams|stream", default_ns = xmlns_component };
  36
  37 function stream_callbacks.error(session, error, data, data2)
  38         log("warn", "Error processing component stream: "..tostring(error));
  39         if error == "no-stream" then
  40                 session:close("invalid-namespace");
  41         elseif error == "xml-parse-error" and data == "unexpected-element-close" then
  42                 session.log("warn", "Unexpected close of '%s' tag", data2);
  43                 session:close("xml-not-well-formed");
  44         else
  45                 session.log("warn", "External component %s XML parse error: %s", tostring(session.host), tostring(error));
  46                 session:close("xml-not-well-formed");
  47         end
  48 end
  49
  50 function stream_callbacks.streamopened(session, attr)
  51         if config.get(attr.to, "core", "component_module") ~= "component" then
  52                 -- Trying to act as a component domain which
  53                 -- hasn't been configured
  54                 session:close{ condition = "host-unknown", text = tostring(attr.to).." does not match any configured external components" };
  55                 return;
  56         end
  57
  58         -- Store the original host (this is used for config, etc.)
  59         session.user = attr.to;
  60         -- Set the host for future reference
  61         session.host = config.get(attr.to, "core", "component_address") or attr.to;
  62         -- Note that we don't create the internal component
  63         -- until after the external component auths successfully
  64
  65         session.streamid = uuid_gen();
  66         session.notopen = nil;
  67
  68         session.send(st.stanza("stream:stream", { xmlns=xmlns_component,
  69                         ["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.host }):top_tag());
  70
  71 end
  72
  73 function stream_callbacks.streamclosed(session)
  74         session.send("</stream:stream>");
  75         session.notopen = true;
  76 end
  77
  78 local core_process_stanza = core_process_stanza;
  79
  80 function stream_callbacks.handlestanza(session, stanza)
  81         -- Namespaces are icky.
  82         if not stanza.attr.xmlns and stanza.name == "handshake" then
  83                 stanza.attr.xmlns = xmlns_component;
  84         end
  85         return core_process_stanza(session, stanza);
  86 end
  87
  88 --- Closing a component connection
  89 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
  90 local function session_close(session, reason)
  91         local log = session.log or log;
  92         if session.conn then
  93                 if reason then
  94                         if type(reason) == "string" then -- assume stream error
  95                                 log("info", "Disconnecting component, <stream:error> is: %s", reason);
  96                                 session.send(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
  97                         elseif type(reason) == "table" then
  98                                 if reason.condition then
  99                                         local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
 100                                         if reason.text then
 101                                                 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
 102                                         end
 103                                         if reason.extra then
 104                                                 stanza:add_child(reason.extra);
 105                                         end
 106                                         log("info", "Disconnecting component, <stream:error> is: %s", tostring(stanza));
 107                                         session.send(stanza);
 108                                 elseif reason.name then -- a stanza
 109                                         log("info", "Disconnecting component, <stream:error> is: %s", tostring(reason));
 110                                         session.send(reason);
 111                                 end
 112                         end
 113                 end
 114                 session.send("</stream:stream>");
 115                 session.conn.close();
 116                 component_listener.disconnect(session.conn, "stream error");
 117         end
 118 end
 119
 120 --- Component connlistener
 121 function component_listener.listener(conn, data)
 122         local session = sessions[conn];
 123         if not session then
 124                 local _send = conn.write;
 125                 session = { type = "component", conn = conn, send = function (data) return _send(tostring(data)); end };
 126                 sessions[conn] = session;
 127
 128                 -- Logging functions --
 129
 130                 local conn_name = "jcp"..tostring(conn):match("[a-f0-9]+$");
 131                 session.log = logger.init(conn_name);
 132                 session.close = session_close;
 133
 134                 session.log("info", "Incoming Jabber component connection");
 135
 136                 local parser = lxp.new(init_xmlhandlers(session, stream_callbacks), "|");
 137                 session.parser = parser;
 138
 139                 session.notopen = true;
 140
 141                 function session.data(conn, data)
 142                         local ok, err = parser:parse(data);
 143                         if ok then return; end
 144                         session:close("xml-not-well-formed");
 145                 end
 146
 147                 session.dispatch_stanza = stream_callbacks.handlestanza;
 148
 149         end
 150         if data then
 151                 session.data(conn, data);
 152         end
 153 end
 154
 155 function component_listener.disconnect(conn, err)
 156         local session = sessions[conn];
 157         if session then
 158                 (session.log or log)("info", "component disconnected: %s (%s)", tostring(session.host), tostring(err));
 159                 if session.host then
 160                         log("debug", "Deregistering component");
 161                         cm_deregister_component(session.host);
 162                         hosts[session.host].connected = nil;
 163                 end
 164                 sessions[conn]  = nil;
 165                 session = nil;
 166                 collectgarbage("collect");
 167         end
 168 end
 169
 170 connlisteners.register('xmppcomponent', component_listener);