net/xmppserver_listener.lua

   1
   2 local logger = require "logger";
   3 local lxp = require "lxp"
   4 local init_xmlhandlers = require "core.xmlhandlers"
   5 local sm_new_session = require "core.sessionmanager".new_session;
   6 local s2s_new_incoming = require "core.s2smanager".new_incoming;
   7 local s2s_streamopened = require "core.s2smanager".streamopened;
   8 local s2s_streamclosed = require "core.s2smanager".streamclosed;
   9 local s2s_destroy_session = require "core.s2smanager".destroy_session;
  10
  11 local stream_callbacks = { streamopened = s2s_streamopened, streamclosed = s2s_streamclosed };
  12
  13 local connlisteners_register = require "net.connlisteners".register;
  14
  15 local t_insert = table.insert;
  16 local t_concat = table.concat;
  17 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
  18 local m_random = math.random;
  19 local format = string.format;
  20 local sm_new_session, sm_destroy_session = sessionmanager.new_session, sessionmanager.destroy_session; --import("core.sessionmanager", "new_session", "destroy_session");
  21 local st = stanza;
  22
  23 local sessions = {};
  24 local xmppserver = { default_port = 5269 };
  25
  26 -- These are session methods --
  27
  28 local function session_reset_stream(session)
  29         -- Reset stream
  30                 local parser = lxp.new(init_xmlhandlers(session, stream_callbacks), "|");
  31                 session.parser = parser;
  32
  33                 session.notopen = true;
  34
  35                 function session.data(conn, data)
  36                         parser:parse(data);
  37                 end
  38                 return true;
  39 end
  40
  41
  42 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
  43 local function session_close(session, reason)
  44         local log = session.log or log;
  45         if session.conn then
  46                 if reason then
  47                         if type(reason) == "string" then -- assume stream error
  48                                 log("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, reason);
  49                                 session.sends2s(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
  50                         elseif type(reason) == "table" then
  51                                 if reason.condition then
  52                                         local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
  53                                         if reason.text then
  54                                                 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
  55                                         end
  56                                         if reason.extra then
  57                                                 stanza:add_child(reason.extra);
  58                                         end
  59                                         log("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, tostring(stanza));
  60                                         session.sends2s(stanza);
  61                                 elseif reason.name then -- a stanza
  62                                         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));
  63                                         session.sends2s(reason);
  64                                 end
  65                         end
  66                 end
  67                 session.sends2s("</stream:stream>");
  68                 session.conn.close();
  69                 xmppserver.disconnect(session.conn, "stream error");
  70         end
  71 end
  72
  73
  74 -- End of session methods --
  75
  76 function xmppserver.listener(conn, data)
  77         local session = sessions[conn];
  78         if not session then
  79                 session = s2s_new_incoming(conn);
  80                 sessions[conn] = session;
  81
  82                 -- Logging functions --
  83
  84                 local mainlog, log = log;
  85                 do
  86                         local conn_name = "s2sin"..tostring(conn):match("[a-f0-9]+$");
  87                         log = logger.init(conn_name);
  88                 end
  89                 local print = function (...) log("info", t_concatall({...}, "\t")); end
  90                 session.log = log;
  91
  92                 print("Incoming s2s connection");
  93
  94                 session.reset_stream = session_reset_stream;
  95                 session.close = session_close;
  96
  97                 session_reset_stream(session); -- Initialise, ready for use
  98
  99                 -- FIXME: Below function should be session,stanza - and xmlhandlers should use :method() notation to call,
 100                 -- this will avoid the useless indirection we have atm
 101                 -- (I'm on a mission, no time to fix now)
 102
 103                 -- Debug version --
 104                 local function handleerr(err) print("Traceback:", err, debug.traceback()); end
 105                 session.stanza_dispatch = function (stanza) return select(2, xpcall(function () return core_process_stanza(session, stanza); end, handleerr));  end
 106         end
 107         if data then
 108                 session.data(conn, data);
 109         end
 110 end
 111
 112 function xmppserver.disconnect(conn)
 113         local session = sessions[conn];
 114         if session then
 115                 (session.log or log)("info", "s2s disconnected: %s->%s", tostring(session.from_host), tostring(session.to_host));
 116                 s2s_destroy_session(session);
 117                 sessions[conn]  = nil;
 118                 session = nil;
 119                 collectgarbage("collect");
 120         end
 121 end
 122
 123 function xmppserver.register_outgoing(conn, session)
 124         session.direction = "outgoing";
 125         sessions[conn] = session;
 126
 127         session.reset_stream = session_reset_stream;
 128         session_reset_stream(session); -- Initialise, ready for use
 129
 130         -- FIXME: Below function should be session,stanza - and xmlhandlers should use :method() notation to call,
 131         -- this will avoid the useless indirection we have atm
 132         -- (I'm on a mission, no time to fix now)
 133         session.stanza_dispatch = function (stanza) return core_process_stanza(session, stanza); end
 134 end
 135
 136 connlisteners_register("xmppserver", xmppserver);
 137
 138
 139 -- We need to perform some initialisation when a connection is created
 140 -- We also need to perform that same initialisation at other points (SASL, TLS, ...)
 141
 142 -- ...and we need to handle data
 143 -- ...and record all sessions associated with connections