net/xmppserver_listener.lua

   1 -- Prosody IM
   2 -- Copyright (C) 2008-2009 Matthew Wild
   3 -- Copyright (C) 2008-2009 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 = { default_ns = "jabber:server",
  21                 streamopened = s2s_streamopened, streamclosed = s2s_streamclosed, handlestanza =  core_process_stanza };
  22
  23 local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";
  24
  25 function stream_callbacks.error(session, error, data)
  26         if error == "no-stream" then
  27                 session:close("invalid-namespace");
  28         elseif error == "parse-error" then
  29                 session.log("debug", "Server-to-server XML parse error: %s", tostring(error));
  30                 session:close("xml-not-well-formed");
  31         elseif error == "stream-error" then
  32                 local condition, text = "undefined-condition";
  33                 for child in data:children() do
  34                         if child.attr.xmlns == xmlns_xmpp_streams then
  35                                 if child.name ~= "text" then
  36                                         condition = child.name;
  37                                 else
  38                                         text = child:get_text();
  39                                 end
  40                                 if condition ~= "undefined-condition" and text then
  41                                         break;
  42                                 end
  43                         end
  44                 end
  45                 text = condition .. (text and (" ("..text..")") or "");
  46                 session.log("info", "Session closed by remote with error: %s", text);
  47                 session:close(nil, text);
  48         end
  49 end
  50
  51 local function handleerr(err) log("error", "Traceback[s2s]: %s: %s", tostring(err), debug.traceback()); end
  52 function stream_callbacks.handlestanza(a, b)
  53         xpcall(function () core_process_stanza(a, b) end, handleerr);
  54 end
  55
  56 local connlisteners_register = require "net.connlisteners".register;
  57
  58 local t_insert = table.insert;
  59 local t_concat = table.concat;
  60 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
  61 local m_random = math.random;
  62 local format = string.format;
  63 local sessionmanager = require "core.sessionmanager";
  64 local sm_new_session, sm_destroy_session = sessionmanager.new_session, sessionmanager.destroy_session;
  65 local st = require "util.stanza";
  66
  67 local sessions = {};
  68 local xmppserver = { default_port = 5269, default_mode = "*a" };
  69
  70 -- These are session methods --
  71
  72 local function session_reset_stream(session)
  73         -- Reset stream
  74                 local parser = lxp.new(init_xmlhandlers(session, stream_callbacks), "\1");
  75                 session.parser = parser;
  76
  77                 session.notopen = true;
  78
  79                 function session.data(conn, data)
  80                         local ok, err = parser:parse(data);
  81                         if ok then return; end
  82                         (session.log or log)("warn", "Received invalid XML: %s", data);
  83                         (session.log or log)("warn", "Problem was: %s", err);
  84                         session:close("xml-not-well-formed");
  85                 end
  86
  87                 return true;
  88 end
  89
  90 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
  91 local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
  92 local function session_close(session, reason, remote_reason)
  93         local log = session.log or log;
  94         if session.conn then
  95                 if session.notopen then
  96                         session.sends2s("<?xml version='1.0'?>");
  97                         session.sends2s(st.stanza("stream:stream", default_stream_attr):top_tag());
  98                 end
  99                 if reason then
 100                         if type(reason) == "string" then -- assume stream error
 101                                 log("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, reason);
 102                                 session.sends2s(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
 103                         elseif type(reason) == "table" then
 104                                 if reason.condition then
 105                                         local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
 106                                         if reason.text then
 107                                                 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
 108                                         end
 109                                         if reason.extra then
 110                                                 stanza:add_child(reason.extra);
 111                                         end
 112                                         log("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, tostring(stanza));
 113                                         session.sends2s(stanza);
 114                                 elseif reason.name then -- a stanza
 115                                         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));
 116                                         session.sends2s(reason);
 117                                 end
 118                         end
 119                 end
 120                 session.sends2s("</stream:stream>");
 121                 if session.notopen or not session.conn:close() then
 122                         session.conn:close(true); -- Force FIXME: timer?
 123                 end
 124                 session.conn:close();
 125                 xmppserver.ondisconnect(session.conn, remote_reason or (reason and (reason.text or reason.condition)) or reason or "stream closed");
 126         end
 127 end
 128
 129
 130 -- End of session methods --
 131
 132 function xmppserver.onincoming(conn, data)
 133         local session = sessions[conn];
 134         if not session then
 135                 session = s2s_new_incoming(conn);
 136                 sessions[conn] = session;
 137
 138                 -- Logging functions --
 139
 140
 141                 local conn_name = "s2sin"..tostring(conn):match("[a-f0-9]+$");
 142                 session.log = logger.init(conn_name);
 143
 144                 session.log("info", "Incoming s2s connection");
 145
 146                 session.reset_stream = session_reset_stream;
 147                 session.close = session_close;
 148
 149                 session_reset_stream(session); -- Initialise, ready for use
 150
 151                 session.dispatch_stanza = stream_callbacks.handlestanza;
 152         end
 153         if data then
 154                 session.data(conn, data);
 155         end
 156 end
 157
 158 function xmppserver.onstatus(conn, status)
 159         if status == "ssl-handshake-complete" then
 160                 local session = sessions[conn];
 161                 if session and session.direction == "outgoing" then
 162                         local format, to_host, from_host = string.format, session.to_host, session.from_host;
 163                         session.log("debug", "Sending stream header...");
 164                         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));
 165                 end
 166         end
 167 end
 168
 169 function xmppserver.ondisconnect(conn, err)
 170         local session = sessions[conn];
 171         if session then
 172                 if err and err ~= "closed" and session.srv_hosts then
 173                         (session.log or log)("debug", "s2s connection attempt failed: %s", err);
 174                         if s2s_attempt_connect(session, err) then
 175                                 (session.log or log)("debug", "...so we're going to try another target");
 176                                 return; -- Session lives for now
 177                         end
 178                 end
 179                 (session.log or log)("info", "s2s disconnected: %s->%s (%s)", tostring(session.from_host), tostring(session.to_host), tostring(err or "closed"));
 180                 s2s_destroy_session(session, err);
 181                 sessions[conn]  = nil;
 182                 session = nil;
 183         end
 184 end
 185
 186 function xmppserver.register_outgoing(conn, session)
 187         session.direction = "outgoing";
 188         sessions[conn] = session;
 189
 190         session.reset_stream = session_reset_stream;
 191         session.close = session_close;
 192         session_reset_stream(session); -- Initialise, ready for use
 193
 194         --local function handleerr(err) print("Traceback:", err, debug.traceback()); end
 195         --session.stanza_dispatch = function (stanza) return select(2, xpcall(function () return core_process_stanza(session, stanza); end, handleerr));  end
 196 end
 197
 198 connlisteners_register("xmppserver", xmppserver);
 199
 200
 201 -- We need to perform some initialisation when a connection is created
 202 -- We also need to perform that same initialisation at other points (SASL, TLS, ...)
 203
 204 -- ...and we need to handle data
 205 -- ...and record all sessions associated with connections