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