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 local tostring = tostring;
  11 local type = type;
  12 local xpcall = xpcall;
  13 local s_format = string.format;
  14 local traceback = debug.traceback;
  15
  16 local logger = require "logger";
  17 local log = logger.init("xmppserver_listener");
  18 local st = require "util.stanza";
  19 local connlisteners_register = require "net.connlisteners".register;
  20 local new_xmpp_stream = require "util.xmppstream".new;
  21 local s2s_new_incoming = require "core.s2smanager".new_incoming;
  22 local s2s_streamopened = require "core.s2smanager".streamopened;
  23 local s2s_streamclosed = require "core.s2smanager".streamclosed;
  24 local s2s_destroy_session = require "core.s2smanager".destroy_session;
  25 local s2s_attempt_connect = require "core.s2smanager".attempt_connection;
  26 local stream_callbacks = { default_ns = "jabber:server",
  27                 streamopened = s2s_streamopened, streamclosed = s2s_streamclosed, handlestanza =  core_process_stanza };
  28
  29 local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";
  30
  31 function stream_callbacks.error(session, error, data)
  32         if error == "no-stream" then
  33                 session:close("invalid-namespace");
  34         elseif error == "parse-error" then
  35                 session.log("debug", "Server-to-server XML parse error: %s", tostring(error));
  36                 session:close("not-well-formed");
  37         elseif error == "stream-error" then
  38                 local condition, text = "undefined-condition";
  39                 for child in data:children() do
  40                         if child.attr.xmlns == xmlns_xmpp_streams then
  41                                 if child.name ~= "text" then
  42                                         condition = child.name;
  43                                 else
  44                                         text = child:get_text();
  45                                 end
  46                                 if condition ~= "undefined-condition" and text then
  47                                         break;
  48                                 end
  49                         end
  50                 end
  51                 text = condition .. (text and (" ("..text..")") or "");
  52                 session.log("info", "Session closed by remote with error: %s", text);
  53                 session:close(nil, text);
  54         end
  55 end
  56
  57 local function handleerr(err) log("error", "Traceback[s2s]: %s: %s", tostring(err), traceback()); end
  58 function stream_callbacks.handlestanza(session, stanza)
  59         if stanza.attr.xmlns == "jabber:client" then --COMPAT: Prosody pre-0.6.2 may send jabber:client
  60                 stanza.attr.xmlns = nil;
  61         end
  62         stanza = session.filter("stanzas/in", stanza);
  63         if stanza then
  64                 return xpcall(function () return core_process_stanza(session, stanza) end, handleerr);
  65         end
  66 end
  67
  68 local sessions = {};
  69 local xmppserver = { default_port = 5269, default_mode = "*a" };
  70
  71 -- These are session methods --
  72
  73 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
  74 local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
  75 local function session_close(session, reason, remote_reason)
  76         local log = session.log or log;
  77         if session.conn then
  78                 if session.notopen then
  79                         session.sends2s("<?xml version='1.0'?>");
  80                         session.sends2s(st.stanza("stream:stream", default_stream_attr):top_tag());
  81                 end
  82                 if reason then
  83                         if type(reason) == "string" then -- assume stream error
  84                                 log("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, reason);
  85                                 session.sends2s(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
  86                         elseif type(reason) == "table" then
  87                                 if reason.condition then
  88                                         local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
  89                                         if reason.text then
  90                                                 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
  91                                         end
  92                                         if reason.extra then
  93                                                 stanza:add_child(reason.extra);
  94                                         end
  95                                         log("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, tostring(stanza));
  96                                         session.sends2s(stanza);
  97                                 elseif reason.name then -- a stanza
  98                                         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));
  99                                         session.sends2s(reason);
 100                                 end
 101                         end
 102                 end
 103                 session.sends2s("</stream:stream>");
 104                 if session.notopen or not session.conn:close() then
 105                         session.conn:close(true); -- Force FIXME: timer?
 106                 end
 107                 session.conn:close();
 108                 xmppserver.ondisconnect(session.conn, remote_reason or (reason and (reason.text or reason.condition)) or reason or "stream closed");
 109         end
 110 end
 111
 112
 113 -- End of session methods --
 114
 115 local function initialize_session(session)
 116         local stream = new_xmpp_stream(session, stream_callbacks);
 117         session.stream = stream;
 118
 119         session.notopen = true;
 120
 121         function session.reset_stream()
 122                 session.notopen = true;
 123                 session.stream:reset();
 124         end
 125
 126         local filter = session.filter;
 127         function session.data(data)
 128                 data = filter("bytes/in", data);
 129                 if data then
 130                         local ok, err = stream:feed(data);
 131                         if ok then return; end
 132                         (session.log or log)("warn", "Received invalid XML: %s", data);
 133                         (session.log or log)("warn", "Problem was: %s", err);
 134                         session:close("not-well-formed");
 135                 end
 136         end
 137
 138         session.close = session_close;
 139         local handlestanza = stream_callbacks.handlestanza;
 140         function session.dispatch_stanza(session, stanza)
 141                 return handlestanza(session, stanza);
 142         end
 143 end
 144
 145 function xmppserver.onconnect(conn)
 146         if not sessions[conn] then -- May be an existing outgoing session
 147                 local session = s2s_new_incoming(conn);
 148                 sessions[conn] = session;
 149
 150                 -- Logging functions --
 151                 local conn_name = "s2sin"..tostring(conn):match("[a-f0-9]+$");
 152                 session.log = logger.init(conn_name);
 153
 154                 session.log("info", "Incoming s2s connection");
 155
 156                 initialize_session(session);
 157         end
 158 end
 159
 160 function xmppserver.onincoming(conn, data)
 161         local session = sessions[conn];
 162         if session then
 163                 session.data(data);
 164         end
 165 end
 166
 167 function xmppserver.onstatus(conn, status)
 168         if status == "ssl-handshake-complete" then
 169                 local session = sessions[conn];
 170                 if session and session.direction == "outgoing" then
 171                         local to_host, from_host = session.to_host, session.from_host;
 172                         session.log("debug", "Sending stream header...");
 173                         session.sends2s(s_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));
 174                 end
 175         end
 176 end
 177
 178 function xmppserver.ondisconnect(conn, err)
 179         local session = sessions[conn];
 180         if session then
 181                 if err and err ~= "closed" and session.srv_hosts then
 182                         (session.log or log)("debug", "s2s connection attempt failed: %s", err);
 183                         if s2s_attempt_connect(session, err) then
 184                                 (session.log or log)("debug", "...so we're going to try another target");
 185                                 return; -- Session lives for now
 186                         end
 187                 end
 188                 (session.log or log)("info", "s2s disconnected: %s->%s (%s)", tostring(session.from_host), tostring(session.to_host), tostring(err or "closed"));
 189                 s2s_destroy_session(session, err);
 190                 sessions[conn]  = nil;
 191                 session = nil;
 192         end
 193 end
 194
 195 function xmppserver.register_outgoing(conn, session)
 196         session.direction = "outgoing";
 197         sessions[conn] = session;
 198
 199         initialize_session(session);
 200 end
 201
 202 connlisteners_register("xmppserver", xmppserver);
 203
 204
 205 -- We need to perform some initialisation when a connection is created
 206 -- We also need to perform that same initialisation at other points (SASL, TLS, ...)
 207
 208 -- ...and we need to handle data
 209 -- ...and record all sessions associated with connections