net/xmppclient_listener.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2010 Matthew Wild
   3 -- Copyright (C) 2008-2010 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
  11 local logger = require "logger";
  12 local log = logger.init("xmppclient_listener");
  13 local new_xmpp_stream = require "util.xmppstream".new;
  14
  15 local connlisteners_register = require "net.connlisteners".register;
  16
  17 local sessionmanager = require "core.sessionmanager";
  18 local sm_new_session, sm_destroy_session = sessionmanager.new_session, sessionmanager.destroy_session;
  19 local sm_streamopened = sessionmanager.streamopened;
  20 local sm_streamclosed = sessionmanager.streamclosed;
  21 local st = require "util.stanza";
  22 local xpcall = xpcall;
  23 local tostring = tostring;
  24 local type = type;
  25 local traceback = debug.traceback;
  26
  27 local config = require "core.configmanager";
  28 local opt_keepalives = config.get("*", "core", "tcp_keepalives");
  29
  30 local stream_callbacks = { default_ns = "jabber:client",
  31                 streamopened = sm_streamopened, streamclosed = sm_streamclosed, handlestanza = core_process_stanza };
  32
  33 local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";
  34
  35 function stream_callbacks.error(session, error, data)
  36         if error == "no-stream" then
  37                 session.log("debug", "Invalid opening stream header");
  38                 session:close("invalid-namespace");
  39         elseif error == "parse-error" then
  40                 (session.log or log)("debug", "Client XML parse error: %s", tostring(data));
  41                 session:close("not-well-formed");
  42         elseif error == "stream-error" then
  43                 local condition, text = "undefined-condition";
  44                 for child in data:children() do
  45                         if child.attr.xmlns == xmlns_xmpp_streams then
  46                                 if child.name ~= "text" then
  47                                         condition = child.name;
  48                                 else
  49                                         text = child:get_text();
  50                                 end
  51                                 if condition ~= "undefined-condition" and text then
  52                                         break;
  53                                 end
  54                         end
  55                 end
  56                 text = condition .. (text and (" ("..text..")") or "");
  57                 session.log("info", "Session closed by remote with error: %s", text);
  58                 session:close(nil, text);
  59         end
  60 end
  61
  62 local function handleerr(err) log("error", "Traceback[c2s]: %s: %s", tostring(err), traceback()); end
  63 function stream_callbacks.handlestanza(session, stanza)
  64         stanza = session.filter("stanzas/in", stanza);
  65         if stanza then
  66                 return xpcall(function () return core_process_stanza(session, stanza) end, handleerr);
  67         end
  68 end
  69
  70 local sessions = {};
  71 local xmppclient = { default_port = 5222, default_mode = "*a" };
  72
  73 -- These are session methods --
  74
  75 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
  76 local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
  77 local function session_close(session, reason)
  78         local log = session.log or log;
  79         if session.conn then
  80                 if session.notopen then
  81                         session.send("<?xml version='1.0'?>");
  82                         session.send(st.stanza("stream:stream", default_stream_attr):top_tag());
  83                 end
  84                 if reason then
  85                         if type(reason) == "string" then -- assume stream error
  86                                 log("info", "Disconnecting client, <stream:error> is: %s", reason);
  87                                 session.send(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
  88                         elseif type(reason) == "table" then
  89                                 if reason.condition then
  90                                         local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
  91                                         if reason.text then
  92                                                 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
  93                                         end
  94                                         if reason.extra then
  95                                                 stanza:add_child(reason.extra);
  96                                         end
  97                                         log("info", "Disconnecting client, <stream:error> is: %s", tostring(stanza));
  98                                         session.send(stanza);
  99                                 elseif reason.name then -- a stanza
 100                                         log("info", "Disconnecting client, <stream:error> is: %s", tostring(reason));
 101                                         session.send(reason);
 102                                 end
 103                         end
 104                 end
 105                 session.send("</stream:stream>");
 106                 session.conn:close();
 107                 xmppclient.ondisconnect(session.conn, (reason and (reason.text or reason.condition)) or reason or "session closed");
 108         end
 109 end
 110
 111
 112 -- End of session methods --
 113
 114 function xmppclient.onconnect(conn)
 115         local session = sm_new_session(conn);
 116         sessions[conn] = session;
 117
 118         session.log("info", "Client connected");
 119
 120         -- Client is using legacy SSL (otherwise mod_tls sets this flag)
 121         if conn:ssl() then
 122                 session.secure = true;
 123         end
 124
 125         if opt_keepalives ~= nil then
 126                 conn:setoption("keepalive", opt_keepalives);
 127         end
 128
 129         session.close = session_close;
 130
 131         local stream = new_xmpp_stream(session, stream_callbacks);
 132         session.stream = stream;
 133
 134         session.notopen = true;
 135
 136         function session.reset_stream()
 137                 session.notopen = true;
 138                 session.stream:reset();
 139         end
 140
 141         local filter = session.filter;
 142         function session.data(data)
 143                 data = filter("bytes/in", data);
 144                 if data then
 145                         local ok, err = stream:feed(data);
 146                         if ok then return; end
 147                         log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data, data:sub(1, 300):gsub("[\r\n]+", " "):gsub("[%z\1-\31]", "_"));
 148                         session:close("not-well-formed");
 149                 end
 150         end
 151
 152         local handlestanza = stream_callbacks.handlestanza;
 153         function session.dispatch_stanza(session, stanza)
 154                 return handlestanza(session, stanza);
 155         end
 156 end
 157
 158 function xmppclient.onincoming(conn, data)
 159         local session = sessions[conn];
 160         if session then
 161                 session.data(data);
 162         end
 163 end
 164
 165 function xmppclient.ondisconnect(conn, err)
 166         local session = sessions[conn];
 167         if session then
 168                 (session.log or log)("info", "Client disconnected: %s", err);
 169                 sm_destroy_session(session, err);
 170                 sessions[conn]  = nil;
 171                 session = nil;
 172         end
 173 end
 174
 175 function xmppclient.associate_session(conn, session)
 176         sessions[conn] = session;
 177 end
 178
 179 connlisteners_register("xmppclient", xmppclient);