net/xmppclient_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
  11 local logger = require "logger";
  12 local log = logger.init("xmppclient_listener");
  13 local lxp = require "lxp"
  14 local init_xmlhandlers = require "core.xmlhandlers"
  15 local sm_new_session = require "core.sessionmanager".new_session;
  16
  17 local connlisteners_register = require "net.connlisteners".register;
  18
  19 local t_insert = table.insert;
  20 local t_concat = table.concat;
  21 local t_concatall = function (t, sep) local tt = {}; for _, s in ipairs(t) do t_insert(tt, tostring(s)); end return t_concat(tt, sep); end
  22 local m_random = math.random;
  23 local format = string.format;
  24 local sessionmanager = require "core.sessionmanager";
  25 local sm_new_session, sm_destroy_session = sessionmanager.new_session, sessionmanager.destroy_session;
  26 local sm_streamopened = sessionmanager.streamopened;
  27 local sm_streamclosed = sessionmanager.streamclosed;
  28 local st = require "util.stanza";
  29
  30 local stream_callbacks = { stream_tag = "http://etherx.jabber.org/streams\1stream",
  31                 default_ns = "jabber:client",
  32                 streamopened = sm_streamopened, streamclosed = sm_streamclosed, handlestanza = core_process_stanza };
  33
  34 function stream_callbacks.error(session, error, data)
  35         if error == "no-stream" then
  36                 session.log("debug", "Invalid opening stream header");
  37                 session:close("invalid-namespace");
  38         elseif session.close then
  39                 (session.log or log)("debug", "Client XML parse error: %s", tostring(error));
  40                 session:close("xml-not-well-formed");
  41         end
  42 end
  43
  44 local function handleerr(err) log("error", "Traceback[c2s]: %s: %s", tostring(err), debug.traceback()); end
  45 function stream_callbacks.handlestanza(a, b)
  46         xpcall(function () core_process_stanza(a, b) end, handleerr);
  47 end
  48
  49 local sessions = {};
  50 local xmppclient = { default_port = 5222, default_mode = "*a" };
  51
  52 -- These are session methods --
  53
  54 local function session_reset_stream(session)
  55         -- Reset stream
  56                 local parser = lxp.new(init_xmlhandlers(session, stream_callbacks), "\1");
  57                 session.parser = parser;
  58
  59                 session.notopen = true;
  60
  61                 function session.data(conn, data)
  62                         local ok, err = parser:parse(data);
  63                         if ok then return; end
  64                         log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data, data:sub(1, 300):gsub("[\r\n]+", " "));
  65                         session:close("xml-not-well-formed");
  66                 end
  67
  68                 return true;
  69 end
  70
  71
  72 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
  73 local default_stream_attr = { ["xmlns:stream"] = stream_callbacks.stream_tag:match("[^\1]*"), xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
  74 local function session_close(session, reason)
  75         local log = session.log or log;
  76         if session.conn then
  77                 if session.notopen then
  78                         session.send("<?xml version='1.0'?>");
  79                         session.send(st.stanza("stream:stream", default_stream_attr):top_tag());
  80                 end
  81                 if reason then
  82                         if type(reason) == "string" then -- assume stream error
  83                                 log("info", "Disconnecting client, <stream:error> is: %s", reason);
  84                                 session.send(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
  85                         elseif type(reason) == "table" then
  86                                 if reason.condition then
  87                                         local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
  88                                         if reason.text then
  89                                                 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
  90                                         end
  91                                         if reason.extra then
  92                                                 stanza:add_child(reason.extra);
  93                                         end
  94                                         log("info", "Disconnecting client, <stream:error> is: %s", tostring(stanza));
  95                                         session.send(stanza);
  96                                 elseif reason.name then -- a stanza
  97                                         log("info", "Disconnecting client, <stream:error> is: %s", tostring(reason));
  98                                         session.send(reason);
  99                                 end
 100                         end
 101                 end
 102                 session.send("</stream:stream>");
 103                 session.conn:close();
 104                 xmppclient.ondisconnect(session.conn, (reason and (reason.text or reason.condition)) or reason or "session closed");
 105         end
 106 end
 107
 108
 109 -- End of session methods --
 110
 111 function xmppclient.onincoming(conn, data)
 112         local session = sessions[conn];
 113         if not session then
 114                 session = sm_new_session(conn);
 115                 sessions[conn] = session;
 116
 117                 session.log("info", "Client connected");
 118
 119                 -- Client is using legacy SSL (otherwise mod_tls sets this flag)
 120                 if conn:ssl() then
 121                         session.secure = true;
 122                 end
 123
 124                 session.reset_stream = session_reset_stream;
 125                 session.close = session_close;
 126
 127                 session_reset_stream(session); -- Initialise, ready for use
 128
 129                 session.dispatch_stanza = stream_callbacks.handlestanza;
 130         end
 131         if data then
 132                 session.data(conn, data);
 133         end
 134 end
 135
 136 function xmppclient.ondisconnect(conn, err)
 137         local session = sessions[conn];
 138         if session then
 139                 (session.log or log)("info", "Client disconnected: %s", err);
 140                 sm_destroy_session(session, err);
 141                 sessions[conn]  = nil;
 142                 session = nil;
 143         end
 144 end
 145
 146 connlisteners_register("xmppclient", xmppclient);