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 new_xmpp_stream = require "util.xmppstream".new;
  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         if b.attr.xmlns == "jabber:client" then --COMPAT: Prosody pre-0.6.2 may send jabber:client
  54                 b.attr.xmlns = nil;
  55         end
  56         xpcall(function () core_process_stanza(a, b) end, handleerr);
  57 end
  58
  59 local connlisteners_register = require "net.connlisteners".register;
  60
  61 local t_insert = table.insert;
  62 local t_concat = table.concat;
  63 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
  64 local m_random = math.random;
  65 local format = string.format;
  66 local sessionmanager = require "core.sessionmanager";
  67 local sm_new_session, sm_destroy_session = sessionmanager.new_session, sessionmanager.destroy_session;
  68 local st = require "util.stanza";
  69
  70 local sessions = {};
  71 local xmppserver = { default_port = 5269, default_mode = "*a" };
  72
  73 -- These are session methods --
  74
  75 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
  76 local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
  77 local function session_close(session, reason, remote_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.ondisconnect(session.conn, remote_reason or (reason and (reason.text or reason.condition)) or reason or "stream closed");
 111         end
 112 end
 113
 114
 115 -- End of session methods --
 116
 117 local function initialize_session(session)
 118         local stream = new_xmpp_stream(session, stream_callbacks);
 119         session.stream = stream;
 120
 121         session.notopen = true;
 122
 123         function session.reset_stream()
 124                 session.notopen = true;
 125                 session.stream:reset();
 126         end
 127
 128         local filter = session.filter;
 129         function session.data(data)
 130                 data = filter("bytes/in", data);
 131                 if data then
 132                         local ok, err = stream:feed(data);
 133                         if ok then return; end
 134                         (session.log or log)("warn", "Received invalid XML: %s", data);
 135                         (session.log or log)("warn", "Problem was: %s", err);
 136                         session:close("xml-not-well-formed");
 137                 end
 138         end
 139
 140         session.close = session_close;
 141         local handlestanza = stream_callbacks.handlestanza;
 142         function session.dispatch_stanza(session, stanza)
 143                 stanza = filters("stanzas/in", stanza);
 144                 if stanza then
 145                         return handlestanza(session, stanza);
 146                 end
 147         end
 148 end
 149
 150 function xmppserver.onconnect(conn)
 151         if not sessions[conn] then -- May be an existing outgoing session
 152                 local session = s2s_new_incoming(conn);
 153                 sessions[conn] = session;
 154
 155                 -- Logging functions --
 156                 local conn_name = "s2sin"..tostring(conn):match("[a-f0-9]+$");
 157                 session.log = logger.init(conn_name);
 158
 159                 session.log("info", "Incoming s2s connection");
 160
 161                 initialize_session(session);
 162         end
 163 end
 164
 165 function xmppserver.onincoming(conn, data)
 166         local session = sessions[conn];
 167         if session then
 168                 session.data(data);
 169         end
 170 end
 171
 172 function xmppserver.onstatus(conn, status)
 173         if status == "ssl-handshake-complete" then
 174                 local session = sessions[conn];
 175                 if session and session.direction == "outgoing" then
 176                         local format, to_host, from_host = string.format, session.to_host, session.from_host;
 177                         session.log("debug", "Sending stream header...");
 178                         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));
 179                 end
 180         end
 181 end
 182
 183 function xmppserver.ondisconnect(conn, err)
 184         local session = sessions[conn];
 185         if session then
 186                 if err and err ~= "closed" and session.srv_hosts then
 187                         (session.log or log)("debug", "s2s connection attempt failed: %s", err);
 188                         if s2s_attempt_connect(session, err) then
 189                                 (session.log or log)("debug", "...so we're going to try another target");
 190                                 return; -- Session lives for now
 191                         end
 192                 end
 193                 (session.log or log)("info", "s2s disconnected: %s->%s (%s)", tostring(session.from_host), tostring(session.to_host), tostring(err or "closed"));
 194                 s2s_destroy_session(session, err);
 195                 sessions[conn]  = nil;
 196                 session = nil;
 197         end
 198 end
 199
 200 function xmppserver.register_outgoing(conn, session)
 201         session.direction = "outgoing";
 202         sessions[conn] = session;
 203
 204         initialize_session(session);
 205 end
 206
 207 connlisteners_register("xmppserver", xmppserver);
 208
 209
 210 -- We need to perform some initialisation when a connection is created
 211 -- We also need to perform that same initialisation at other points (SASL, TLS, ...)
 212
 213 -- ...and we need to handle data
 214 -- ...and record all sessions associated with connections