1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
|
-- Prosody IM
-- Copyright (C) 2008-2010 Matthew Wild
-- Copyright (C) 2008-2010 Waqas Hussain
--
-- This project is MIT/X11 licensed. Please see the
-- COPYING file in the source package for more information.
--
module:set_global();
local add_task = require "util.timer".add_task;
local new_xmpp_stream = require "util.xmppstream".new;
local nameprep = require "util.encodings".stringprep.nameprep;
local portmanager = require "core.portmanager";
local sessionmanager = require "core.sessionmanager";
local st = require "util.stanza";
local sm_new_session, sm_destroy_session = sessionmanager.new_session, sessionmanager.destroy_session;
local uuid_generate = require "util.uuid".generate;
local xpcall, tostring, type = xpcall, tostring, type;
local format = string.format;
local traceback = debug.traceback;
local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";
local log = module._log;
local c2s_timeout = module:get_option_number("c2s_timeout");
local opt_keepalives = module:get_option_boolean("tcp_keepalives", false);
local sessions = module:shared("sessions");
local stream_callbacks = { default_ns = "jabber:client", handlestanza = core_process_stanza };
local listener = { default_port = 5222, default_mode = "*a" };
--- Stream events handlers
local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
function stream_callbacks.streamopened(session, attr)
local send = session.send;
session.host = nameprep(attr.to);
if not session.host then
session:close{ condition = "improper-addressing",
text = "A valid 'to' attribute is required on stream headers" };
return;
end
session.version = tonumber(attr.version) or 0;
session.streamid = uuid_generate();
(session.log or session)("debug", "Client sent opening <stream:stream> to %s", session.host);
if not hosts[session.host] then
-- We don't serve this host...
session:close{ condition = "host-unknown", text = "This server does not serve "..tostring(session.host)};
return;
end
send("<?xml version='1.0'?>");
send(format("<stream:stream xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' id='%s' from='%s' version='1.0' xml:lang='en'>", session.streamid, session.host));
(session.log or log)("debug", "Sent reply <stream:stream> to client");
session.notopen = nil;
-- If session.secure is *false* (not nil) then it means we /were/ encrypting
-- since we now have a new stream header, session is secured
if session.secure == false then
session.secure = true;
end
local features = st.stanza("stream:features");
hosts[session.host].events.fire_event("stream-features", { origin = session, features = features });
module:fire_event("stream-features", session, features);
send(features);
end
function stream_callbacks.streamclosed(session)
session.log("debug", "Received </stream:stream>");
session:close();
end
function stream_callbacks.error(session, error, data)
if error == "no-stream" then
session.log("debug", "Invalid opening stream header");
session:close("invalid-namespace");
elseif error == "parse-error" then
(session.log or log)("debug", "Client XML parse error: %s", tostring(data));
session:close("not-well-formed");
elseif error == "stream-error" then
local condition, text = "undefined-condition";
for child in data:children() do
if child.attr.xmlns == xmlns_xmpp_streams then
if child.name ~= "text" then
condition = child.name;
else
text = child:get_text();
end
if condition ~= "undefined-condition" and text then
break;
end
end
end
text = condition .. (text and (" ("..text..")") or "");
session.log("info", "Session closed by remote with error: %s", text);
session:close(nil, text);
end
end
local function handleerr(err) log("error", "Traceback[c2s]: %s: %s", tostring(err), traceback()); end
function stream_callbacks.handlestanza(session, stanza)
stanza = session.filter("stanzas/in", stanza);
if stanza then
return xpcall(function () return core_process_stanza(session, stanza) end, handleerr);
end
end
--- Session methods
local function session_close(session, reason)
local log = session.log or log;
if session.conn then
if session.notopen then
session.send("<?xml version='1.0'?>");
session.send(st.stanza("stream:stream", default_stream_attr):top_tag());
end
if reason then
if type(reason) == "string" then -- assume stream error
log("info", "Disconnecting client, <stream:error> is: %s", reason);
session.send(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
elseif type(reason) == "table" then
if reason.condition then
local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
if reason.text then
stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
end
if reason.extra then
stanza:add_child(reason.extra);
end
log("info", "Disconnecting client, <stream:error> is: %s", tostring(stanza));
session.send(stanza);
elseif reason.name then -- a stanza
log("info", "Disconnecting client, <stream:error> is: %s", tostring(reason));
session.send(reason);
end
end
end
session.send("</stream:stream>");
session.conn:close();
listener.ondisconnect(session.conn, (reason and (reason.text or reason.condition)) or reason or "session closed");
end
end
--- Port listener
function listener.onconnect(conn)
local session = sm_new_session(conn);
sessions[conn] = session;
session.log("info", "Client connected");
-- Client is using legacy SSL (otherwise mod_tls sets this flag)
if conn:ssl() then
session.secure = true;
end
if opt_keepalives then
conn:setoption("keepalive", opt_keepalives);
end
session.close = session_close;
local stream = new_xmpp_stream(session, stream_callbacks);
session.stream = stream;
session.notopen = true;
function session.reset_stream()
session.notopen = true;
session.stream:reset();
end
local filter = session.filter;
function session.data(data)
data = filter("bytes/in", data);
if data then
local ok, err = stream:feed(data);
if ok then return; end
log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data, data:sub(1, 300):gsub("[\r\n]+", " "):gsub("[%z\1-\31]", "_"));
session:close("not-well-formed");
end
end
if c2s_timeout then
add_task(c2s_timeout, function ()
if session.type == "c2s_unauthed" then
session:close("connection-timeout");
end
end);
end
session.dispatch_stanza = stream_callbacks.handlestanza;
end
function listener.onincoming(conn, data)
local session = sessions[conn];
if session then
session.data(data);
end
end
function listener.ondisconnect(conn, err)
local session = sessions[conn];
if session then
(session.log or log)("info", "Client disconnected: %s", err);
sm_destroy_session(session, err);
sessions[conn] = nil;
session = nil;
end
end
function listener.associate_session(conn, session)
sessions[conn] = session;
end
module:add_item("net-provider", {
name = "c2s";
listener = listener;
default_port = 5222;
encryption = "starttls";
});
module:add_item("net-provider", {
name = "legacy_ssl";
listener = listener;
encryption = "ssl";
});
|
