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 lxp = require "lxp"
  19 local new_xmpp_stream = require "util.xmppstream".new;
  20 local s2s_new_incoming = require "core.s2smanager".new_incoming;
  21 local s2s_streamopened = require "core.s2smanager".streamopened;
  22 local s2s_streamclosed = require "core.s2smanager".streamclosed;
  23 local s2s_destroy_session = require "core.s2smanager".destroy_session;
  24 local s2s_attempt_connect = require "core.s2smanager".attempt_connection;
  25 local stream_callbacks = { default_ns = "jabber:server",
  26                 streamopened = s2s_streamopened, streamclosed = s2s_streamclosed, handlestanza =  core_process_stanza };
  27
  28 local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";
  29
  30 function stream_callbacks.error(session, error, data)
  31         if error == "no-stream" then
  32                 session:close("invalid-namespace");
  33         elseif error == "parse-error" then
  34                 session.log("debug", "Server-to-server XML parse error: %s", tostring(error));
  35                 session:close("not-well-formed");
  36         elseif error == "stream-error" then
  37                 local condition, text = "undefined-condition";
  38                 for child in data:children() do
  39                         if child.attr.xmlns == xmlns_xmpp_streams then
  40                                 if child.name ~= "text" then
  41                                         condition = child.name;
  42                                 else
  43                                         text = child:get_text();
  44                                 end
  45                                 if condition ~= "undefined-condition" and text then
  46                                         break;
  47                                 end
  48                         end
  49                 end
  50                 text = condition .. (text and (" ("..text..")") or "");
  51                 session.log("info", "Session closed by remote with error: %s", text);
  52                 session:close(nil, text);
  53         end
  54 end
  55
  56 local function handleerr(err) log("error", "Traceback[s2s]: %s: %s", tostring(err), traceback()); end
  57 function stream_callbacks.handlestanza(session, stanza)
  58         if stanza.attr.xmlns == "jabber:client" then --COMPAT: Prosody pre-0.6.2 may send jabber:client
  59                 stanza.attr.xmlns = nil;
  60         end
  61         stanza = session.filter("stanzas/in", stanza);
  62         if stanza then
  63                 return xpcall(function () return core_process_stanza(session, stanza) end, handleerr);
  64         end
  65 end
  66
  67 local connlisteners_register = require "net.connlisteners".register;
  68
  69 local t_insert = table.insert;
  70 local t_concat = table.concat;
  71 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
  72 local m_random = math.random;
  73 local format = string.format;
  74 local sessionmanager = require "core.sessionmanager";
  75 local sm_new_session, sm_destroy_session = sessionmanager.new_session, sessionmanager.destroy_session;
  76 local st = require "util.stanza";
  77
  78 local sessions = {};
  79 local xmppserver = { default_port = 5269, default_mode = "*a" };
  80
  81 -- These are session methods --
  82
  83 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
  84 local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
  85 local function session_close(session, reason, remote_reason)
  86         local log = session.log or log;
  87         if session.conn then
  88                 if session.notopen then
  89                         session.sends2s("<?xml version='1.0'?>");
  90                         session.sends2s(st.stanza("stream:stream", default_stream_attr):top_tag());
  91                 end
  92                 if reason then
  93                         if type(reason) == "string" then -- assume stream error
  94                                 log("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, reason);
  95                                 session.sends2s(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
  96                         elseif type(reason) == "table" then
  97                                 if reason.condition then
  98                                         local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
  99                                         if reason.text then
 100                                                 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
 101                                         end
 102                                         if reason.extra then
 103                                                 stanza:add_child(reason.extra);
 104                                         end
 105                                         log("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, tostring(stanza));
 106                                         session.sends2s(stanza);
 107                                 elseif reason.name then -- a stanza
 108                                         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));
 109                                         session.sends2s(reason);
 110                                 end
 111                         end
 112                 end
 113                 session.sends2s("</stream:stream>");
 114                 if session.notopen or not session.conn:close() then
 115                         session.conn:close(true); -- Force FIXME: timer?
 116                 end
 117                 session.conn:close();
 118                 xmppserver.ondisconnect(session.conn, remote_reason or (reason and (reason.text or reason.condition)) or reason or "stream closed");
 119         end
 120 end
 121
 122
 123 -- End of session methods --
 124
 125 local function initialize_session(session)
 126         local stream = new_xmpp_stream(session, stream_callbacks);
 127         session.stream = stream;
 128
 129         session.notopen = true;
 130
 131         function session.reset_stream()
 132                 session.notopen = true;
 133                 session.stream:reset();
 134         end
 135
 136         local filter = session.filter;
 137         function session.data(data)
 138                 data = filter("bytes/in", data);
 139                 if data then
 140                         local ok, err = stream:feed(data);
 141                         if ok then return; end
 142                         (session.log or log)("warn", "Received invalid XML: %s", data);
 143                         (session.log or log)("warn", "Problem was: %s", err);
 144                         session:close("not-well-formed");
 145                 end
 146         end
 147
 148         session.close = session_close;
 149         local handlestanza = stream_callbacks.handlestanza;
 150         function session.dispatch_stanza(session, stanza)
 151                 return handlestanza(session, stanza);
 152         end
 153 end
 154
 155 function xmppserver.onconnect(conn)
 156         if not sessions[conn] then -- May be an existing outgoing session
 157                 local session = s2s_new_incoming(conn);
 158                 sessions[conn] = session;
 159
 160                 -- Logging functions --
 161                 local conn_name = "s2sin"..tostring(conn):match("[a-f0-9]+$");
 162                 session.log = logger.init(conn_name);
 163
 164                 session.log("info", "Incoming s2s connection");
 165
 166                 initialize_session(session);
 167         end
 168 end
 169
 170 function xmppserver.onincoming(conn, data)
 171         local session = sessions[conn];
 172         if session then
 173                 session.data(data);
 174         end
 175 end
 176
 177 function xmppserver.onstatus(conn, status)
 178         if status == "ssl-handshake-complete" then
 179                 local session = sessions[conn];
 180                 if session and session.direction == "outgoing" then
 181                         local to_host, from_host = session.to_host, session.from_host;
 182                         session.log("debug", "Sending stream header...");
 183                         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));
 184                 end
 185         end
 186 end
 187
 188 function xmppserver.ondisconnect(conn, err)
 189         local session = sessions[conn];
 190         if session then
 191                 if err and err ~= "closed" and session.srv_hosts then
 192                         (session.log or log)("debug", "s2s connection attempt failed: %s", err);
 193                         if s2s_attempt_connect(session, err) then
 194                                 (session.log or log)("debug", "...so we're going to try another target");
 195                                 return; -- Session lives for now
 196                         end
 197                 end
 198                 (session.log or log)("info", "s2s disconnected: %s->%s (%s)", tostring(session.from_host), tostring(session.to_host), tostring(err or "closed"));
 199                 s2s_destroy_session(session, err);
 200                 sessions[conn]  = nil;
 201                 session = nil;
 202         end
 203 end
 204
 205 function xmppserver.register_outgoing(conn, session)
 206         session.direction = "outgoing";
 207         sessions[conn] = session;
 208
 209         initialize_session(session);
 210 end
 211
 212 connlisteners_register("xmppserver", xmppserver);
 213
 214
 215 -- We need to perform some initialisation when a connection is created
 216 -- We also need to perform that same initialisation at other points (SASL, TLS, ...)
 217
 218 -- ...and we need to handle data
 219 -- ...and record all sessions associated with connections