prosody
db27a4c18b6a
plugins/mod_c2s.lua

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plugins/mod_c2s.lua @ 4543:db27a4c18b6a

mod_c2s, sessionmanager, xmppclient_listener: Move all c2s network and stream logic into a new module, mod_c2s
author Matthew Wild <mwild1@gmail.com>
date Sun, 22 Jan 2012 23:57:13 +0000
child 4548:e6e5c76ff009
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4542:50aca1e0bfbd 4543:db27a4c18b6a
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 module:set_global();
10
11 local new_xmpp_stream = require "util.xmppstream".new;
12 local nameprep = require "util.encodings".stringprep.nameprep;
13 local portmanager = require "core.portmanager";
14 local sessionmanager = require "core.sessionmanager";
15 local st = require "util.stanza";
16 local sm_new_session, sm_destroy_session = sessionmanager.new_session, sessionmanager.destroy_session;
17 local uuid_generate = require "util.uuid".generate;
18
19 local xpcall, tostring, type = xpcall, tostring, type;
20 local format = string.format;
21 local traceback = debug.traceback;
22
23 local xmlns_xmpp_streams = "urn:ietf:params:xml:ns:xmpp-streams";
24
25 local log = module._log;
26
27 local opt_keepalives = module:get_option_boolean("tcp_keepalives", false);
28
29 local sessions = module:shared("sessions");
30
31 local stream_callbacks = { default_ns = "jabber:client", handlestanza = core_process_stanza };
32 local listener = { default_port = 5222, default_mode = "*a" };
33
34 --- Stream events handlers
35 local stream_xmlns_attr = {xmlns='urn:ietf:params:xml:ns:xmpp-streams'};
36 local default_stream_attr = { ["xmlns:stream"] = "http://etherx.jabber.org/streams", xmlns = stream_callbacks.default_ns, version = "1.0", id = "" };
37
38 function stream_callbacks.streamopened(session, attr)
39 local send = session.send;
40 session.host = attr.to;
41 if not session.host then
42 session:close{ condition = "improper-addressing",
43 text = "A 'to' attribute is required on stream headers" };
44 return;
45 end
46 session.host = nameprep(session.host);
47 session.version = tonumber(attr.version) or 0;
48 session.streamid = uuid_generate();
49 (session.log or session)("debug", "Client sent opening <stream:stream> to %s", session.host);
50
51 if not hosts[session.host] then
52 -- We don't serve this host...
53 session:close{ condition = "host-unknown", text = "This server does not serve "..tostring(session.host)};
54 return;
55 end
56
57 send("<?xml version='1.0'?>");
58 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));
59
60 (session.log or log)("debug", "Sent reply <stream:stream> to client");
61 session.notopen = nil;
62
63 -- If session.secure is *false* (not nil) then it means we /were/ encrypting
64 -- since we now have a new stream header, session is secured
65 if session.secure == false then
66 session.secure = true;
67 end
68
69 local features = st.stanza("stream:features");
70 hosts[session.host].events.fire_event("stream-features", { origin = session, features = features });
71 module:fire_event("stream-features", session, features);
72
73 send(features);
74 end
75
76 function stream_callbacks.streamclosed(session)
77 session.log("debug", "Received </stream:stream>");
78 session:close();
79 end
80
81 function stream_callbacks.error(session, error, data)
82 if error == "no-stream" then
83 session.log("debug", "Invalid opening stream header");
84 session:close("invalid-namespace");
85 elseif error == "parse-error" then
86 (session.log or log)("debug", "Client XML parse error: %s", tostring(data));
87 session:close("not-well-formed");
88 elseif error == "stream-error" then
89 local condition, text = "undefined-condition";
90 for child in data:children() do
91 if child.attr.xmlns == xmlns_xmpp_streams then
92 if child.name ~= "text" then
93 condition = child.name;
94 else
95 text = child:get_text();
96 end
97 if condition ~= "undefined-condition" and text then
98 break;
99 end
100 end
101 end
102 text = condition .. (text and (" ("..text..")") or "");
103 session.log("info", "Session closed by remote with error: %s", text);
104 session:close(nil, text);
105 end
106 end
107
108 local function handleerr(err) log("error", "Traceback[c2s]: %s: %s", tostring(err), traceback()); end
109 function stream_callbacks.handlestanza(session, stanza)
110 stanza = session.filter("stanzas/in", stanza);
111 if stanza then
112 return xpcall(function () return core_process_stanza(session, stanza) end, handleerr);
113 end
114 end
115
116 --- Session methods
117 local function session_close(session, reason)
118 local log = session.log or log;
119 if session.conn then
120 if session.notopen then
121 session.send("<?xml version='1.0'?>");
122 session.send(st.stanza("stream:stream", default_stream_attr):top_tag());
123 end
124 if reason then
125 if type(reason) == "string" then -- assume stream error
126 log("info", "Disconnecting client, <stream:error> is: %s", reason);
127 session.send(st.stanza("stream:error"):tag(reason, {xmlns = 'urn:ietf:params:xml:ns:xmpp-streams' }));
128 elseif type(reason) == "table" then
129 if reason.condition then
130 local stanza = st.stanza("stream:error"):tag(reason.condition, stream_xmlns_attr):up();
131 if reason.text then
132 stanza:tag("text", stream_xmlns_attr):text(reason.text):up();
133 end
134 if reason.extra then
135 stanza:add_child(reason.extra);
136 end
137 log("info", "Disconnecting client, <stream:error> is: %s", tostring(stanza));
138 session.send(stanza);
139 elseif reason.name then -- a stanza
140 log("info", "Disconnecting client, <stream:error> is: %s", tostring(reason));
141 session.send(reason);
142 end
143 end
144 end
145 session.send("</stream:stream>");
146 session.conn:close();
147 listener.ondisconnect(session.conn, (reason and (reason.text or reason.condition)) or reason or "session closed");
148 end
149 end
150
151 --- Port listener
152 function listener.onconnect(conn)
153 local session = sm_new_session(conn);
154 sessions[conn] = session;
155
156 session.log("info", "Client connected");
157
158 -- Client is using legacy SSL (otherwise mod_tls sets this flag)
159 if conn:ssl() then
160 session.secure = true;
161 end
162
163 if opt_keepalives then
164 conn:setoption("keepalive", opt_keepalives);
165 end
166
167 session.close = session_close;
168
169 local stream = new_xmpp_stream(session, stream_callbacks);
170 session.stream = stream;
171 session.notopen = true;
172
173 function session.reset_stream()
174 session.notopen = true;
175 session.stream:reset();
176 end
177
178 local filter = session.filter;
179 function session.data(data)
180 data = filter("bytes/in", data);
181 if data then
182 local ok, err = stream:feed(data);
183 if ok then return; end
184 log("debug", "Received invalid XML (%s) %d bytes: %s", tostring(err), #data, data:sub(1, 300):gsub("[\r\n]+", " "):gsub("[%z\1-\31]", "_"));
185 session:close("not-well-formed");
186 end
187 end
188
189 session.dispatch_stanza = stream_callbacks.handlestanza;
190 end
191
192 function listener.onincoming(conn, data)
193 local session = sessions[conn];
194 if session then
195 session.data(data);
196 end
197 end
198
199 function listener.ondisconnect(conn, err)
200 local session = sessions[conn];
201 if session then
202 (session.log or log)("info", "Client disconnected: %s", err);
203 sm_destroy_session(session, err);
204 sessions[conn] = nil;
205 session = nil;
206 end
207 end
208
209 function listener.associate_session(conn, session)
210 sessions[conn] = session;
211 end
212
213 portmanager.register_service("c2s", {
214 listener = listener;
215 default_port = 5222;
216 encryption = "starttls";
217 });
218
219 portmanager.register_service("legacy_ssl", {
220 listener = listener;
221 encryption = "ssl";
222 });
223
224