1 // ANNA - Anna is Not Nothingness Anymore //
3 // (c) Copyright 2005-2015 Eduardo Ramos Testillano & Francisco Ruiz Rayo //
5 // See project site at http://redmine.teslayout.com/projects/anna-suite //
6 // See accompanying file LICENSE or copy at http://www.teslayout.com/projects/public/anna.LICENSE //
9 #include <anna/core/functions.hpp>
10 #include <anna/diameter/defines.hpp>
11 #include <anna/diameter/functions.hpp>
12 #include <anna/diameter/helpers/helpers.hpp>
13 #include <anna/diameter/codec/functions.hpp>
14 #include <anna/diameter/helpers/base/functions.hpp>
15 #include <anna/time/functions.hpp>
18 #include <anna/diameter.comm/Session.hpp>
19 #include <anna/diameter.comm/Engine.hpp>
20 #include <anna/diameter.comm/Entity.hpp>
21 #include <anna/diameter.comm/Server.hpp>
22 #include <anna/diameter.comm/Transport.hpp>
23 #include <anna/diameter.comm/Response.hpp>
24 #include <anna/diameter.comm/Message.hpp>
25 #include <anna/diameter.comm/TimerManager.hpp>
26 #include <anna/diameter.comm/Timer.hpp>
27 #include <anna/diameter.comm/OriginHostManager.hpp>
28 #include <anna/diameter.comm/OriginHost.hpp>
30 #include <anna/comm/Network.hpp>
31 #include <anna/comm/ClientSocket.hpp>
32 #include <anna/core/functions.hpp>
33 #include <anna/core/DataBlock.hpp>
34 #include <anna/core/tracing/Logger.hpp>
35 #include <anna/core/tracing/TraceMethod.hpp>
36 #include <anna/xml/Node.hpp>
37 #include <anna/timex/Engine.hpp>
38 #include <anna/app/functions.hpp>
41 #include <stdlib.h> // rand()
47 using namespace anna::diameter;
48 using namespace anna::diameter::comm;
51 const anna::Millisecond Session::DefaultTimeout(10000); // Application messages timeout
52 const int Session::DefaultPort(3868);
55 Session::Session(const char *className, const char *timerName) : anna::timex::Timer(timerName, (anna::Millisecond)0) /* not assigned */,
56 a_className(className),
57 a_timeController(NULL),
58 a_notifyOrphansOnExpiration(true),
63 void Session::initialize() {
64 a_state = State::Closed;
66 a_lastIncomingActivityTime = (anna::Millisecond)0;
67 a_lastOutgoingActivityTime = (anna::Millisecond)0;
68 a_onDisconnect = OnDisconnect::WaitPendings;
70 for(int i = ClassCode::Min; i < ClassCode::Max; i ++)
71 a_timeouts [i] = DefaultTimeout;
74 //Session::~Session() {;}
77 void Session::initializeSequences() {
80 // Hop-by-Hop Identifier
81 // The Hop-by-Hop Identifier is an unsigned 32-bit integer field (in
82 // network byte order) and aids in matching requests and replies.
83 // The sender MUST ensure that the Hop-by-Hop identifier in a request
84 // is unique on a given connection at any given time, and MAY attempt
85 // to ensure that the number is unique across reboots. The sender of
86 // an Answer message MUST ensure that the Hop-by-Hop Identifier field
87 // contains the same value that was found in the corresponding
88 // request. The Hop-by-Hop identifier is normally a monotonically
89 // increasing number, whose start value was randomly generated. An
90 // answer message that is received with an unknown Hop-by-Hop
91 // Identifier MUST be discarded.
93 // End-to-End Identifier
94 // The End-to-End Identifier is an unsigned 32-bit integer field (in
95 // network byte order) and is used to detect duplicate messages.
96 // Upon reboot implementations MAY set the high order 12 bits to
97 // contain the low order 12 bits of current time, and the low order
98 // 20 bits to a random value. Senders of request messages MUST
99 // insert a unique identifier on each message. The identifier MUST
100 // remain locally unique for a period of at least 4 minutes, even
101 // across reboots. The originator of an Answer message MUST ensure
102 // that the End-to-End Identifier field contains the same value that
103 // was found in the corresponding request. The End-to-End Identifier
104 // MUST NOT be modified by Diameter agents of any kind. The
105 // combination of the Origin-Host (see Section 6.3) and this field is
106 // used to detect duplicates. Duplicate requests SHOULD cause the
107 // same answer to be transmitted (modulo the hop-by-hop Identifier
108 // field and any routing AVPs that may be present), and MUST NOT
109 // affect any state that was set when the original request was
110 // processed. Duplicate answer messages that are to be locally
111 // consumed (see Section 6.2) SHOULD be silently discarded.
112 srand(::time(NULL) + anna::functions::hash(anna::functions::asString("%s:%d|%d", getAddress().c_str(), getPort(), a_socketId).c_str()));
113 a_nextHopByHop = rand();
114 a_nextEndToEnd = ((::time(NULL) & 0xFFF) << 20) + (rand() & 0xFFFFF);
117 void Session::sendDPA(const Engine *commEngine, const anna::DataBlock &dprDataBlock)
119 LOGMETHOD(anna::TraceMethod traceMethod("anna::diameter::comm::Session", "sendDPA", ANNA_FILE_LOCATION));
120 anna::DataBlock dpa(true);
121 commEngine->readDPA(dpa, dprDataBlock); // Asume that DPA is valid ...
124 LOGWARNING(anna::Logger::warning("This diameter agent defines an empty DPA message. Remote disconnection DPR will be ignored going to the Bound state", ANNA_FILE_LOCATION));
125 setState(State::Bound);
132 LOGWARNING(anna::Logger::warning("DPA has been sent to the peer", ANNA_FILE_LOCATION));
133 // Temporizador de proteccion por si el servidor no cierra:
134 // state event action next state
135 // ---------------------------------------------------------------
136 // R-Open R-Rcv-DPR R-Snd-DPA Closing
137 // Closing Timeout Error Closed
138 activateActionTimer(anna::diameter::comm::Timer::Type::SessionUnbind);
141 void Session::setState(State::_v state) {
144 if(state != a_state) {
145 std::string msg("Session state change: ");
146 msg += asText(a_state);
148 msg += asText(state);
149 anna::Logger::debug(msg, ANNA_FILE_LOCATION);
156 void Session::activateActionTimer(const anna::diameter::comm::Timer::Type::_v type) {
157 LOGMETHOD(anna::TraceMethod traceMethod("anna::diameter::comm::Session", "activateActionTimer", ANNA_FILE_LOCATION));
158 cancelTimer(); // Session timer
161 if(a_actionTimer && a_actionTimer->isActive()) cancelActionTimer(); // no ocurrira
163 a_actionTimer = TimerManager::instantiate().createTimer(this, type);
164 } catch(anna::RuntimeException& ex) {
165 std::string msg = "CAPTURED EXCEPTION during action timer activation (activateActionTimer): ";
167 anna::Logger::error(msg, ANNA_FILE_LOCATION);
172 void Session::cancelActionTimer() {
173 LOGMETHOD(anna::TraceMethod traceMethod("anna::diameter::comm::Session", "cancelActionTimer", ANNA_FILE_LOCATION));
176 if(a_actionTimer->isActive()) {
178 TimerManager::instantiate().cancelTimer(a_actionTimer);
179 } catch(anna::RuntimeException& ex) {
182 } else { // por aqui no deberia pasar ...
183 LOGDEBUG(anna::Logger::debug("Timer not activated!", ANNA_FILE_LOCATION));
186 a_actionTimer = NULL;
191 void Session::activateTimer() {
192 LOGMETHOD(anna::TraceMethod traceMethod("anna::diameter::comm::Session", "activateTimer", ANNA_FILE_LOCATION));
196 if(a_timeController == NULL) // Application must created a timex engine
197 a_timeController = anna::app::functions::component <anna::timex::Engine> (ANNA_FILE_LOCATION);
199 if(isActive()) cancelTimer();
201 a_timeController->activate(this);
202 } catch(anna::RuntimeException& ex) {
203 std::string msg = "CAPTURED EXCEPTION during session timer activation (activateTimer): ";
205 anna::Logger::error(msg, ANNA_FILE_LOCATION);
212 void Session::cancelTimer() {
213 LOGMETHOD(anna::TraceMethod traceMethod("anna::diameter::comm::Session", "cancelTimer", ANNA_FILE_LOCATION));
217 if(a_timeController == NULL) // Application must created a timex engine
218 a_timeController = anna::app::functions::component <anna::timex::Engine> (ANNA_FILE_LOCATION);
220 a_timeController->cancel(this);
221 } catch(anna::RuntimeException& ex) {
222 std::string msg = "CAPTURED EXCEPTION during session timer cancellation (cancelTimer): ";
224 anna::Logger::error(msg, ANNA_FILE_LOCATION);
229 LOGDEBUG(anna::Logger::debug("Timer not activated!", ANNA_FILE_LOCATION));
234 //-------------------------------------------------------------------------
235 // Se invoca desde diameter::comm::Timer
236 //-------------------------------------------------------------------------
237 void Session::expireResponse(diameter::comm::Response* response)
239 LOGMETHOD(anna::TraceMethod traceMethod("anna::diameter::comm::Session", "expireResponse", ANNA_FILE_LOCATION));
240 bool doUnbind = false;
241 bool doRetransmission = false;
243 if(response->getClassCode() != ClassCode::Bind) {
244 if(response->getRequest()->getOnExpiry() == Message::OnExpiry::Abandon) {
245 a_onDisconnect = OnDisconnect::IgnorePendings; // Abandon is not graceful
248 else if(response->getRequest()->getOnExpiry() == Message::OnExpiry::Retransmit) {
249 doRetransmission = true;
252 doUnbind = true; // (*)
255 // Get origin host corresponding to the message:
256 anna::diameter::comm::OriginHostManager &ohm = anna::diameter::comm::OriginHostManager::instantiate();
258 // Extract OriginHost from datablock (db):
259 std::string originHostName = anna::diameter::helpers::base::functions::getOriginHost(response->getRequest()->getBody());
260 LOGDEBUG(anna::Logger::debug(anna::functions::asString("ORIGIN HOST FOR THE MESSAGE WHICH WAS EXPIRED: %s", originHostName.c_str()), ANNA_FILE_LOCATION));
261 anna::diameter::comm::OriginHost *originHost = ohm.getOriginHost(originHostName);
264 response->setMessage(NULL);
265 eventResponse(*response, originHost);
266 } catch(anna::RuntimeException& ex) {
271 diameter::CommandId cid = response->getRequest()->getCommandId();
273 if((cid == helpers::base::COMMANDID__Disconnect_Peer_Request) && (a_state == State::WaitingDPA)) {
274 LOGDEBUG(anna::Logger::debug("Expired DPR sent to remote diameter point: local DPR procedure will be ignored going to the Bound state", ANNA_FILE_LOCATION));
275 setState(State::Bound);
278 if(doRetransmission) {
279 diameter::comm::Message *request = const_cast<Message*>(response->getRequest());
280 int retries = request->getRetries();
283 request->setRetries(retries);
286 std::string msg(asString());
287 msg += anna::functions::asString(" | Retransmission initiated for request with HopByHop: %u; remaining %d retries", response->getHopByHop(), retries);
288 anna::Logger::debug(msg, ANNA_FILE_LOCATION);
290 diameter::codec::functions::setPotentiallyReTransmittedMessageBit(*request);
291 eventRequestRetransmission(request);
296 response_erase(response);
298 if(doUnbind) unbind();
301 void Session::finalize() {
302 LOGMETHOD(anna::TraceMethod traceMethod("anna::diameter::comm::Session", "finalize", ANNA_FILE_LOCATION));
303 setState(State::Closed);
304 cancelTimer(); // Session timer
305 cancelActionTimer(); // Action timer
307 ///////////////////////////////////////////////////////////////////////
308 // Notificar la finalizaci�n de las respuestas pendientes de recibir //
309 ///////////////////////////////////////////////////////////////////////
310 // RFC 3588 - 5.5.4. Failover and Failback Procedures
312 // In the event that a transport failure is detected with a peer, it is
313 // necessary for all pending request messages to be forwarded to an
314 // alternate agent, if possible. This is commonly referred to as
317 // In order for a Diameter node to perform failover procedures, it is
318 // necessary for the node to maintain a pending message queue for a
319 // given peer. When an answer message is received, the corresponding
320 // request is removed from the queue. The Hop-by-Hop Identifier field
321 // is used to match the answer with the queued request.
323 // When a transport failure is detected, if possible all messages in the
324 // queue are sent to an alternate agent with the T flag set. On booting
325 // a Diameter client or agent, the T flag is also set on any records
326 // still remaining to be transmitted in non-volatile storage. An
327 // example of a case where it is not possible to forward the message to
328 // an alternate server is when the message has a fixed destination, and
329 // the unavailable peer is the message's final destination (see
330 // Destination-Host AVP). Such an error requires that the agent return
331 // an answer message with the 'E' bit set and the Result-Code AVP set to
332 // DIAMETER_UNABLE_TO_DELIVER.
334 // It is important to note that multiple identical requests or answers
335 // MAY be received as a result of a failover. The End-to-End Identifier
336 // field in the Diameter header along with the Origin-Host AVP MUST be
337 // used to identify duplicate messages.
340 for(response_iterator ii = response_begin(), maxii = response_end(); ii != maxii; ii ++) {
341 response = Session::response(ii);
342 response->setResultCode(Response::ResultCode::DiameterUnavailable);
344 if(!a_notifyOrphansOnExpiration) { // to avoid message bursts (to alternate servers for client-session context), we will manage at expireResponse
345 response->cancelTimer();
348 response->setMessage(NULL);
349 eventResponse(*response, nullptr); // upstream, we need to check second argument to know if comes from here.
350 // If originHost is NULL, and we are client, we could access through engine: a_engine->getOriginHostName(), and then ohm.getOriginHost(name). BUT CLIENTS DO NOTHING WITH THIS ARGUMENT.
351 // If server, we must return there: add protection for second argument.
352 } catch(anna::RuntimeException& ex) {
356 Response::release(response);
360 if(a_notifyOrphansOnExpiration) return;
365 void Session::response_add(Response* response)
367 a_responses.add(response);
368 response->setSession(this);
371 response->activateTimer();
372 } catch(anna::Exception& ex) {
377 void Session::response_erase(Response* response)
379 a_responses.erase(response);
380 Response::release(response);
382 if(a_state == State::Disconnecting) // only OnDisconnect::WaitPendings arrives here (the other disconnect suddently)
383 if(getOTARequests() == 0) {
384 // TODO: decode response->getRequest(), which is a comm message, so we get Origin-Host, and then, from OriginHostManager, we get the commEngine to provide:
385 //sendDPA(commEngine, dprDataBlock);
388 if(a_state == State::Closing) // only OnDisconnect::WaitPendings arrives here (the other disconnect suddently)
389 if(getOTARequests() == 0) unbind();
392 Response* Session::response_find(const HopByHop hopByHop)
394 diameter::comm::Response* result = a_responses.find(hopByHop);
395 // if (result == NULL) {
396 // string msg(asString());
397 // msg += anna::functions::asString(" | Response received for non registered context (HopByHop: %u)", hopByHop);
398 // throw anna::RuntimeException(msg, ANNA_FILE_LOCATION);
400 //Message * message = const_cast<Message*>(result->getRequest());
404 std::string Session::asString() const
406 string result(a_className);
408 result += anna::timex::Timer::asString();
409 result += " | Socket Id: ";
410 result += anna::functions::asString(a_socketId);
411 result += " | State: ";
412 result += asText(a_state);
413 result += " | OnDisconnect: ";
414 result += asText(a_onDisconnect);
415 result += " | Next Hop by hop: ";
416 result += anna::functions::asString(a_nextHopByHop);
417 result += " | Next End to end: ";
418 result += anna::functions::asString(a_nextEndToEnd);
419 result += anna::functions::asString(" | OTA requests: %d%s", getOTARequests(), idle() ? " (idle)" : "");
420 result += " | Last Incoming Activity Time: ";
421 result += a_lastIncomingActivityTime.asString();
422 result += " | Last Outgoing Activity Time: ";
423 result += a_lastOutgoingActivityTime.asString();
425 for(int i = ClassCode::Bind; i < ClassCode::Max; i ++) {
426 result += " | Timeout for ClassCode '";
427 result += ClassCode::asText((ClassCode::_v)i);
429 result += a_timeouts[i].asString();
435 anna::xml::Node* Session::asXML(anna::xml::Node* parent) const
437 //parent = anna::timex::Timer::asXML(parent);
438 anna::xml::Node* result = parent->createChild("diameter.comm.Session");
439 result->createAttribute("SocketId", anna::functions::asString(a_socketId));
440 result->createAttribute("State", asText(a_state));
441 result->createAttribute("OnDisconnect", asText(a_onDisconnect));
442 result->createAttribute("NextHopByHop", anna::functions::asString(a_nextHopByHop));
443 result->createAttribute("NextEndToEnd", anna::functions::asString(a_nextEndToEnd));
444 result->createAttribute("OTArequests", anna::functions::asString("%d%s", getOTARequests(), idle() ? " (idle)" : ""));
445 result->createAttribute("LastIncomingActivityTime", a_lastIncomingActivityTime.asString());
446 result->createAttribute("LastOutgoingActivityTime", a_lastOutgoingActivityTime.asString());
448 for(int i = ClassCode::Bind; i < ClassCode::Max; i ++) {
449 std::string name = "TimeoutFor"; name += ClassCode::asText((ClassCode::_v)i);
450 result->createAttribute(name.c_str(), a_timeouts[i].asString());
454 anna::xml::Node* messages = result->createChild("diameter.comm.Messages");
455 const Message* message;
457 for(const_response_iterator ii = response_begin(), maxii = response_end(); ii != maxii; ii ++) {
458 if((message = Session::response(ii)->getRequest()) != NULL)
459 message->asXML(messages);
465 const char* Session::asText(const State::_v state)
467 static const char* text [] = { "Closed", "WaitingBind", "Bound", "Failover", "Suspect", "WaitingDPA", "Disconnecting", "Closing" };
471 const char* Session::asText(const OnDisconnect::_v onDisconnect)
473 static const char* text [] = { "IgnorePendings", "WaitPendings" };
474 return text [onDisconnect];
479 HopByHop Session::SortById::value(const Response* response)
481 return response->getHopByHop();
485 //------------------------------------------------------------------------------
486 //---------------------------------------- Session::updateIncomingActivityTime()
487 //------------------------------------------------------------------------------
488 void Session::updateIncomingActivityTime() {
489 a_lastIncomingActivityTime = anna::functions::millisecond();
492 std::string msg = "Updated INCOMING activity on session (milliseconds unix): ";
493 msg += anna::functions::asString(a_lastIncomingActivityTime.getValue());
494 anna::Logger::debug(msg, ANNA_FILE_LOCATION);
499 //------------------------------------------------------------------------------
500 //---------------------------------------- Session::updateOutgoingActivityTime()
501 //------------------------------------------------------------------------------
502 void Session::updateOutgoingActivityTime(void) {
503 a_lastOutgoingActivityTime = anna::functions::millisecond();
506 std::string msg = "Updated OUTGOING activity on session (milliseconds unix): ";
507 msg += anna::functions::asString(a_lastOutgoingActivityTime.getValue());
508 anna::Logger::debug(msg, ANNA_FILE_LOCATION);