net/xmppserver_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("xmppserver_listener");
  13 local lxp = require "lxp"
  14 local init_xmlhandlers = require "core.xmlhandlers"
  15 local s2s_new_incoming = require "core.s2smanager".new_incoming;
  16 local s2s_streamopened = require "core.s2smanager".streamopened;
  17 local s2s_streamclosed = require "core.s2smanager".streamclosed;
  18 local s2s_destroy_session = require "core.s2smanager".destroy_session;
  19 local s2s_attempt_connect = require "core.s2smanager".attempt_connection;
  20 local stream_callbacks = { stream_tag = "http://etherx.jabber.org/streams|stream",
  21                 default_ns = "jabber:server",
  22                 streamopened = s2s_streamopened, streamclosed = s2s_streamclosed, handlestanza =  core_process_stanza };
  23
  24 function stream_callbacks.error(session, error, data)
  25         if error == "no-stream" then
  26                 session:close("invalid-namespace");
  27         else
  28                 session.log("debug", "Server-to-server XML parse error: %s", tostring(error));
  29                 session:close("xml-not-well-formed");
  30         end
  31 end
  32
  33 local function handleerr(err) log("error", "Traceback[s2s]: %s: %s", tostring(err), debug.traceback()); end
  34 function stream_callbacks.handlestanza(a, b)
  35         xpcall(function () core_process_stanza(a, b) end, handleerr);
  36 end
  37
  38 local connlisteners_register = require "net.connlisteners".register;
  39
  40 local t_insert = table.insert;
  41 local t_concat = table.concat;
  42 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
  43 local m_random = math.random;
  44 local format = string.format;
  45 local sessionmanager = require "core.sessionmanager";
  46 local sm_new_session, sm_destroy_session = sessionmanager.new_session, sessionmanager.destroy_session;
  47 local st = require "util.stanza";
  48
  49 local sessions = {};
  50 local xmppserver = { default_port = 5269, 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), "|");
  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 function session_close(session, reason)
  74         local log = session.log or log;
  75         if session.conn then
  76                 if reason then
  77                         if type(reason) == "string" then -- assume stream error
  78                                 log("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, reason);
  79                                 session.sends2s(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
  80                         elseif type(reason) == "table" then
  81                                 if reason.condition then
  82                                         local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
  83                                         if reason.text then
  84                                                 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
  85                                         end
  86                                         if reason.extra then
  87                                                 stanza:add_child(reason.extra);
  88                                         end
  89                                         log("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, tostring(stanza));
  90                                         session.sends2s(stanza);
  91                                 elseif reason.name then -- a stanza
  92                                         log("info", "Disconnecting %s->%s[%s], <stream:error> is: %s", session.from_host or "(unknown host)", session.to_host or "(unknown host)", session.type, tostring(reason));
  93                                         session.sends2s(reason);
  94                                 end
  95                         end
  96                 end
  97                 session.sends2s("</stream:stream>");
  98                 session.conn.close();
  99                 xmppserver.disconnect(session.conn, "stream error");
 100         end
 101 end
 102
 103
 104 -- End of session methods --
 105
 106 function xmppserver.listener(conn, data)
 107         local session = sessions[conn];
 108         if not session then
 109                 session = s2s_new_incoming(conn);
 110                 sessions[conn] = session;
 111
 112                 -- Logging functions --
 113
 114
 115                 local conn_name = "s2sin"..tostring(conn):match("[a-f0-9]+$");
 116                 session.log = logger.init(conn_name);
 117
 118                 session.log("info", "Incoming s2s connection");
 119
 120                 session.reset_stream = session_reset_stream;
 121                 session.close = session_close;
 122
 123                 session_reset_stream(session); -- Initialise, ready for use
 124
 125                 session.dispatch_stanza = stream_callbacks.handlestanza;
 126         end
 127         if data then
 128                 session.data(conn, data);
 129         end
 130 end
 131
 132 function xmppserver.disconnect(conn, err)
 133         local session = sessions[conn];
 134         if session then
 135                 if err and err ~= "closed" and session.srv_hosts then
 136                         (session.log or log)("debug", "s2s connection closed unexpectedly");
 137                         if s2s_attempt_connect(session, err) then
 138                                 (session.log or log)("debug", "...so we're going to try again");
 139                                 return; -- Session lives for now
 140                         end
 141                 end
 142                 (session.log or log)("info", "s2s disconnected: %s->%s (%s)", tostring(session.from_host), tostring(session.to_host), tostring(err));
 143                 s2s_destroy_session(session);
 144                 sessions[conn]  = nil;
 145                 session = nil;
 146                 collectgarbage("collect");
 147         end
 148 end
 149
 150 function xmppserver.register_outgoing(conn, session)
 151         session.direction = "outgoing";
 152         sessions[conn] = session;
 153
 154         session.reset_stream = session_reset_stream;
 155         session.close = session_close;
 156         session_reset_stream(session); -- Initialise, ready for use
 157
 158         --local function handleerr(err) print("Traceback:", err, debug.traceback()); end
 159         --session.stanza_dispatch = function (stanza) return select(2, xpcall(function () return core_process_stanza(session, stanza); end, handleerr));  end
 160 end
 161
 162 connlisteners_register("xmppserver", xmppserver);
 163
 164
 165 -- We need to perform some initialisation when a connection is created
 166 -- We also need to perform that same initialisation at other points (SASL, TLS, ...)
 167
 168 -- ...and we need to handle data
 169 -- ...and record all sessions associated with connections