net/xmppserver_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("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\1stream",
  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         if b.attr.xmlns == "jabber:client" then --COMPAT: Prosody pre-0.6.2 may send jabber:client
  36                 b.attr.xmlns = nil;
  37         end
  38         xpcall(function () core_process_stanza(a, b) end, handleerr);
  39 end
  40
  41 local connlisteners_register = require "net.connlisteners".register;
  42
  43 local t_insert = table.insert;
  44 local t_concat = table.concat;
  45 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
  46 local m_random = math.random;
  47 local format = string.format;
  48 local sessionmanager = require "core.sessionmanager";
  49 local sm_new_session, sm_destroy_session = sessionmanager.new_session, sessionmanager.destroy_session;
  50 local st = require "util.stanza";
  51
  52 local sessions = {};
  53 local xmppserver = { default_port = 5269, default_mode = "*a" };
  54
  55 -- These are session methods --
  56
  57 local function session_reset_stream(session)
  58         -- Reset stream
  59                 local parser = lxp.new(init_xmlhandlers(session, stream_callbacks), "\1");
  60                 session.parser = parser;
  61
  62                 session.notopen = true;
  63
  64                 function session.data(conn, data)
  65                         local ok, err = parser:parse(data);
  66                         if ok then return; end
  67                         (session.log or log)("warn", "Received invalid XML: %s", data);
  68                         (session.log or log)("warn", "Problem was: %s", err);
  69                         session:close("xml-not-well-formed");
  70                 end
  71
  72                 return true;
  73 end
  74
  75 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
  76 local default_stream_attr = { ["xmlns:stream"] = stream_callbacks.stream_tag:match("[^\1]*"), xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
  77 local function session_close(session, reason)
  78         local log = session.log or log;
  79         if session.conn then
  80                 if session.notopen then
  81                         session.sends2s("<?xml version='1.0'?>");
  82                         session.sends2s(st.stanza("stream:stream", default_stream_attr):top_tag());
  83                 end
  84                 if reason then
  85                         if type(reason) == "string" then -- assume stream error
  86                                 log("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, reason);
  87                                 session.sends2s(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
  88                         elseif type(reason) == "table" then
  89                                 if reason.condition then
  90                                         local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
  91                                         if reason.text then
  92                                                 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
  93                                         end
  94                                         if reason.extra then
  95                                                 stanza:add_child(reason.extra);
  96                                         end
  97                                         log("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, tostring(stanza));
  98                                         session.sends2s(stanza);
  99                                 elseif reason.name then -- a stanza
 100                                         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));
 101                                         session.sends2s(reason);
 102                                 end
 103                         end
 104                 end
 105                 session.sends2s("</stream:stream>");
 106                 if session.notopen or not session.conn.close() then
 107                         session.conn.close(true); -- Force FIXME: timer?
 108                 end
 109                 session.conn.close();
 110                 xmppserver.disconnect(session.conn, "stream error");
 111         end
 112 end
 113
 114
 115 -- End of session methods --
 116
 117 function xmppserver.listener(conn, data)
 118         local session = sessions[conn];
 119         if not session then
 120                 session = s2s_new_incoming(conn);
 121                 sessions[conn] = session;
 122
 123                 -- Logging functions --
 124
 125
 126                 local conn_name = "s2sin"..tostring(conn):match("[a-f0-9]+$");
 127                 session.log = logger.init(conn_name);
 128
 129                 session.log("info", "Incoming s2s connection");
 130
 131                 session.reset_stream = session_reset_stream;
 132                 session.close = session_close;
 133
 134                 session_reset_stream(session); -- Initialise, ready for use
 135
 136                 session.dispatch_stanza = stream_callbacks.handlestanza;
 137         end
 138         if data then
 139                 session.data(conn, data);
 140         end
 141 end
 142
 143 function xmppserver.status(conn, status)
 144         if status == "ssl-handshake-complete" then
 145                 local session = sessions[conn];
 146                 if session and session.direction == "outgoing" then
 147                         local format, to_host, from_host = string.format, session.to_host, session.from_host;
 148                         session.log("debug", "Sending stream header...");
 149                         session.sends2s(format([[<stream:stream xmlns='jabber:server' xmlns:db='jabber:server:dialback' xmlns:stream='http://etherx.jabber.org/streams' from='%s' to='%s' version='1.0'>]], from_host, to_host));
 150                 end
 151         end
 152 end
 153
 154 function xmppserver.disconnect(conn, err)
 155         local session = sessions[conn];
 156         if session then
 157                 if err and err ~= "closed" and session.srv_hosts then
 158                         (session.log or log)("debug", "s2s connection attempt failed: %s", err);
 159                         if s2s_attempt_connect(session, err) then
 160                                 (session.log or log)("debug", "...so we're going to try another target");
 161                                 return; -- Session lives for now
 162                         end
 163                 end
 164                 (session.log or log)("info", "s2s disconnected: %s->%s (%s)", tostring(session.from_host), tostring(session.to_host), tostring(err));
 165                 s2s_destroy_session(session, err);
 166                 sessions[conn]  = nil;
 167                 session = nil;
 168         end
 169 end
 170
 171 function xmppserver.register_outgoing(conn, session)
 172         session.direction = "outgoing";
 173         sessions[conn] = session;
 174
 175         session.reset_stream = session_reset_stream;
 176         session.close = session_close;
 177         session_reset_stream(session); -- Initialise, ready for use
 178
 179         --local function handleerr(err) print("Traceback:", err, debug.traceback()); end
 180         --session.stanza_dispatch = function (stanza) return select(2, xpcall(function () return core_process_stanza(session, stanza); end, handleerr));  end
 181 end
 182
 183 connlisteners_register("xmppserver", xmppserver);
 184
 185
 186 -- We need to perform some initialisation when a connection is created
 187 -- We also need to perform that same initialisation at other points (SASL, TLS, ...)
 188
 189 -- ...and we need to handle data
 190 -- ...and record all sessions associated with connections