diff options
Diffstat (limited to 'plugins/mod_c2s.lua')
| -rw-r--r-- | plugins/mod_c2s.lua | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/plugins/mod_c2s.lua b/plugins/mod_c2s.lua new file mode 100644 index 00000000..69f2298f --- /dev/null +++ b/plugins/mod_c2s.lua @@ -0,0 +1,241 @@ +-- 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 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 = {}; + +--- 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"; + multiplex = { + pattern = "^<.*:stream.*%sxmlns%s*=%s*(['\"])jabber:client%1.*>"; + }; +}); + +module:add_item("net-provider", { + name = "legacy_ssl"; + listener = listener; + encryption = "ssl"; + multiplex = { + pattern = "^<.*:stream.*%sxmlns%s*=%s*(['\"])jabber:client%1.*>"; + }; +}); + + |