net/xmppserver_listener.lua

   1 -- Prosody IM v0.1
   2 -- Copyright (C) 2008 Matthew Wild
   3 -- Copyright (C) 2008 Waqas Hussain
   4 --
   5 -- This program is free software; you can redistribute it and/or
   6 -- modify it under the terms of the GNU General Public License
   7 -- as published by the Free Software Foundation; either version 2
   8 -- of the License, or (at your option) any later version.
   9 --
  10 -- This program is distributed in the hope that it will be useful,
  11 -- but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 -- GNU General Public License for more details.
  14 --
  15 -- You should have received a copy of the GNU General Public License
  16 -- along with this program; if not, write to the Free Software
  17 -- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  18 --
  19
  20
  21
  22 local logger = require "logger";
  23 local lxp = require "lxp"
  24 local init_xmlhandlers = require "core.xmlhandlers"
  25 local sm_new_session = require "core.sessionmanager".new_session;
  26 local s2s_new_incoming = require "core.s2smanager".new_incoming;
  27 local s2s_streamopened = require "core.s2smanager".streamopened;
  28 local s2s_streamclosed = require "core.s2smanager".streamclosed;
  29 local s2s_destroy_session = require "core.s2smanager".destroy_session;
  30 local s2s_attempt_connect = require "core.s2smanager".attempt_connection;
  31 local stream_callbacks = { ns = "http://etherx.jabber.org/streams", streamopened = s2s_streamopened, streamclosed = s2s_streamclosed, handlestanza =  core_process_stanza };
  32
  33 function stream_callbacks.error(session, error, data)
  34         if error == "no-stream" then
  35                 session:close("invalid-namespace");
  36         else
  37                 session.log("debug", "Server-to-server XML parse error: %s", tostring(error));
  38                 session:close("xml-not-well-formed");
  39         end
  40 end
  41
  42 local function handleerr(err) log("error", "Traceback[s2s]:", err, debug.traceback()); end
  43 function stream_callbacks.handlestanza(a, b)
  44         xpcall(function () core_process_stanza(a, b) end, handleerr);
  45 end
  46
  47 local connlisteners_register = require "net.connlisteners".register;
  48
  49 local t_insert = table.insert;
  50 local t_concat = table.concat;
  51 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
  52 local m_random = math.random;
  53 local format = string.format;
  54 local sm_new_session, sm_destroy_session = sessionmanager.new_session, sessionmanager.destroy_session; --import("core.sessionmanager", "new_session", "destroy_session");
  55 local st = stanza;
  56
  57 local sessions = {};
  58 local xmppserver = { default_port = 5269, default_mode = "*a" };
  59
  60 -- These are session methods --
  61
  62 local function session_reset_stream(session)
  63         -- Reset stream
  64                 local parser = lxp.new(init_xmlhandlers(session, stream_callbacks), "|");
  65                 session.parser = parser;
  66
  67                 session.notopen = true;
  68
  69                 function session.data(conn, data)
  70                         local ok, err = parser:parse(data);
  71                         if ok then return; end
  72                         session:close("xml-not-well-formed");
  73                 end
  74
  75                 return true;
  76 end
  77
  78
  79 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
  80 local function session_close(session, reason)
  81         local log = session.log or log;
  82         if session.conn then
  83                 if reason then
  84                         if type(reason) == "string" then -- assume stream error
  85                                 log("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, reason);
  86                                 session.sends2s(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
  87                         elseif type(reason) == "table" then
  88                                 if reason.condition then
  89                                         local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
  90                                         if reason.text then
  91                                                 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
  92                                         end
  93                                         if reason.extra then
  94                                                 stanza:add_child(reason.extra);
  95                                         end
  96                                         log("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, tostring(stanza));
  97                                         session.sends2s(stanza);
  98                                 elseif reason.name then -- a stanza
  99                                         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));
 100                                         session.sends2s(reason);
 101                                 end
 102                         end
 103                 end
 104                 session.sends2s("</stream:stream>");
 105                 session.conn.close();
 106                 xmppserver.disconnect(session.conn, "stream error");
 107         end
 108 end
 109
 110
 111 -- End of session methods --
 112
 113 function xmppserver.listener(conn, data)
 114         local session = sessions[conn];
 115         if not session then
 116                 session = s2s_new_incoming(conn);
 117                 sessions[conn] = session;
 118
 119                 -- Logging functions --
 120
 121
 122                 local conn_name = "s2sin"..tostring(conn):match("[a-f0-9]+$");
 123                 session.log = logger.init(conn_name);
 124
 125                 session.log("info", "Incoming s2s connection");
 126
 127                 session.reset_stream = session_reset_stream;
 128                 session.close = session_close;
 129
 130                 session_reset_stream(session); -- Initialise, ready for use
 131
 132                 -- Debug version --
 133 --              local function handleerr(err) print("Traceback:", err, debug.traceback()); end
 134 --              session.stanza_dispatch = function (stanza) return select(2, xpcall(function () return core_process_stanza(session, stanza); end, handleerr));  end
 135         end
 136         if data then
 137                 session.data(conn, data);
 138         end
 139 end
 140
 141 function xmppserver.disconnect(conn, err)
 142         local session = sessions[conn];
 143         if session then
 144                 if err and err ~= "closed" and session.srv_hosts then
 145                         if s2s_attempt_connect(session, err) then
 146                                 return; -- Session lives for now
 147                         end
 148                 end
 149                 (session.log or log)("info", "s2s disconnected: %s->%s (%s)", tostring(session.from_host), tostring(session.to_host), tostring(err));
 150                 s2s_destroy_session(session);
 151                 sessions[conn]  = nil;
 152                 session = nil;
 153                 collectgarbage("collect");
 154         end
 155 end
 156
 157 function xmppserver.register_outgoing(conn, session)
 158         session.direction = "outgoing";
 159         sessions[conn] = session;
 160
 161         session.reset_stream = session_reset_stream;
 162         session_reset_stream(session); -- Initialise, ready for use
 163
 164         --local function handleerr(err) print("Traceback:", err, debug.traceback()); end
 165         --session.stanza_dispatch = function (stanza) return select(2, xpcall(function () return core_process_stanza(session, stanza); end, handleerr));  end
 166 end
 167
 168 connlisteners_register("xmppserver", xmppserver);
 169
 170
 171 -- We need to perform some initialisation when a connection is created
 172 -- We also need to perform that same initialisation at other points (SASL, TLS, ...)
 173
 174 -- ...and we need to handle data
 175 -- ...and record all sessions associated with connections