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