Disconnect with stream errors on bad XML, or invalid stream namespace
[prosody.git] / net / xmppserver_listener.lua
1 -- Prosody IM v0.1
2 -- Copyright (C) 2008 Matthew Wild
3 -- Copyright (C) 2008 Waqas Hussain
4 -- 
5 -- This program is free software; you can redistribute it and/or
6 -- modify it under the terms of the GNU General Public License
7 -- as published by the Free Software Foundation; either version 2
8 -- of the License, or (at your option) any later version.
9 -- 
10 -- This program is distributed in the hope that it will be useful,
11 -- but WITHOUT ANY WARRANTY; without even the implied warranty of
12 -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13 -- GNU General Public License for more details.
14 -- 
15 -- You should have received a copy of the GNU General Public License
16 -- along with this program; if not, write to the Free Software
17 -- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
18 --
19
20
21
22 local logger = require "logger";
23 local lxp = require "lxp"
24 local init_xmlhandlers = require "core.xmlhandlers"
25 local sm_new_session = require "core.sessionmanager".new_session;
26 local s2s_new_incoming = require "core.s2smanager".new_incoming;
27 local s2s_streamopened = require "core.s2smanager".streamopened;
28 local s2s_streamclosed = require "core.s2smanager".streamclosed;
29 local s2s_destroy_session = require "core.s2smanager".destroy_session;
30 local s2s_attempt_connect = require "core.s2smanager".attempt_connection;
31 local stream_callbacks = { ns = "http://etherx.jabber.org/streams", streamopened = s2s_streamopened, streamclosed = s2s_streamclosed, handlestanza =  core_process_stanza };
32
33 function stream_callbacks.error(session, error, data)
34         if error == "no-stream" then
35                 session:close("invalid-namespace");
36         else
37                 session.log("debug", "Server-to-server XML parse error: %s", tostring(error));
38                 session:close("xml-not-well-formed");
39         end
40 end
41
42 local connlisteners_register = require "net.connlisteners".register;
43
44 local t_insert = table.insert;
45 local t_concat = table.concat;
46 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
47 local m_random = math.random;
48 local format = string.format;
49 local sm_new_session, sm_destroy_session = sessionmanager.new_session, sessionmanager.destroy_session; --import("core.sessionmanager", "new_session", "destroy_session");
50 local st = stanza;
51
52 local sessions = {};
53 local xmppserver = { default_port = 5269, default_mode = "*a" };
54
55 -- These are session methods --
56
57 local function session_reset_stream(session)
58         -- Reset stream
59                 local parser = lxp.new(init_xmlhandlers(session, stream_callbacks), "|");
60                 session.parser = parser;
61                 
62                 session.notopen = true;
63                 
64                 function session.data(conn, data)
65                         local ok, err = parser:parse(data);
66                         if ok then return; end
67                         session:close("xml-not-well-formed");
68                 end
69                 
70                 return true;
71 end
72
73
74 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
75 local function session_close(session, reason)
76         local log = session.log or log;
77         if session.conn then
78                 if reason then
79                         if type(reason) == "string" then -- assume stream error
80                                 log("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, reason);
81                                 session.sends2s(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
82                         elseif type(reason) == "table" then
83                                 if reason.condition then
84                                         local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
85                                         if reason.text then
86                                                 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
87                                         end
88                                         if reason.extra then
89                                                 stanza:add_child(reason.extra);
90                                         end
91                                         log("info", "Disconnecting %s[%s], <stream:error> is: %s", session.host or "(unknown host)", session.type, tostring(stanza));
92                                         session.sends2s(stanza);
93                                 elseif reason.name then -- a stanza
94                                         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));
95                                         session.sends2s(reason);
96                                 end
97                         end
98                 end
99                 session.sends2s("</stream:stream>");
100                 session.conn.close();
101                 xmppserver.disconnect(session.conn, "stream error");
102         end
103 end
104
105
106 -- End of session methods --
107
108 function xmppserver.listener(conn, data)
109         local session = sessions[conn];
110         if not session then
111                 session = s2s_new_incoming(conn);
112                 sessions[conn] = session;
113
114                 -- Logging functions --
115
116                 local mainlog, log = log;
117                 do
118                         local conn_name = "s2sin"..tostring(conn):match("[a-f0-9]+$");
119                         log = logger.init(conn_name);
120                 end
121                 local print = function (...) log("info", t_concatall({...}, "\t")); end
122                 session.log = log;
123
124                 print("Incoming s2s connection");
125                 
126                 session.reset_stream = session_reset_stream;
127                 session.close = session_close;
128                 
129                 session_reset_stream(session); -- Initialise, ready for use
130                 
131                 -- FIXME: Below function should be session,stanza - and xmlhandlers should use :method() notation to call,
132                 -- this will avoid the useless indirection we have atm
133                 -- (I'm on a mission, no time to fix now)
134
135                 -- Debug version --
136 --              local function handleerr(err) print("Traceback:", err, debug.traceback()); end
137 --              session.stanza_dispatch = function (stanza) return select(2, xpcall(function () return core_process_stanza(session, stanza); end, handleerr));  end
138         end
139         if data then
140                 session.data(conn, data);
141         end
142 end
143         
144 function xmppserver.disconnect(conn, err)
145         local session = sessions[conn];
146         if session then
147                 if err and err ~= "closed" and session.srv_hosts then
148                         if s2s_attempt_connect(session, err) then
149                                 return; -- Session lives for now
150                         end
151                 end
152                 (session.log or log)("info", "s2s disconnected: %s->%s (%s)", tostring(session.from_host), tostring(session.to_host), tostring(err));
153                 s2s_destroy_session(session);
154                 sessions[conn]  = nil;
155                 session = nil;
156                 collectgarbage("collect");
157         end
158 end
159
160 function xmppserver.register_outgoing(conn, session)
161         session.direction = "outgoing";
162         sessions[conn] = session;
163         
164         session.reset_stream = session_reset_stream;    
165         session_reset_stream(session); -- Initialise, ready for use
166         
167         -- FIXME: Below function should be session,stanza - and xmlhandlers should use :method() notation to call,
168         -- this will avoid the useless indirection we have atm
169         -- (I'm on a mission, no time to fix now)
170         local function handleerr(err) print("Traceback:", err, debug.traceback()); end
171         session.stanza_dispatch = function (stanza) return select(2, xpcall(function () return core_process_stanza(session, stanza); end, handleerr));  end
172 end
173
174 connlisteners_register("xmppserver", xmppserver);
175
176
177 -- We need to perform some initialisation when a connection is created
178 -- We also need to perform that same initialisation at other points (SASL, TLS, ...)
179
180 -- ...and we need to handle data
181 -- ...and record all sessions associated with connections