1 // Licensed to the .NET Foundation under one or more agreements.
2 // The .NET Foundation licenses this file to you under the MIT license.
3 // See the LICENSE file in the project root for more information.
6 #include "dbgtransportsession.h"
8 #if (!defined(RIGHT_SIDE_COMPILE) && defined(FEATURE_DBGIPC_TRANSPORT_VM)) || (defined(RIGHT_SIDE_COMPILE) && defined(FEATURE_DBGIPC_TRANSPORT_DI))
10 // This is the entry type for the IPC event queue owned by the transport.
11 // Each entry contains the multiplexing type of the IPC event plus the
13 struct DbgEventBufferEntry
17 BYTE m_event[CorDBIPC_BUFFER_SIZE]; // buffer for the IPC event
21 // Provides a robust and secure transport session between a debugger and a debuggee that are potentially on
22 // different machines.
24 // See DbgTransportSession.h for further detailed comments.
27 #ifndef RIGHT_SIDE_COMPILE
28 // The one and only transport instance for the left side. Allocated and initialized during EE startup (from
29 // Debugger::Startup() in debugger.cpp).
30 DbgTransportSession *g_pDbgTransport = NULL;
32 #include "ddmarshalutil.h"
33 #endif // !RIGHT_SIDE_COMPILE
35 // No real work done in the constructor. Use Init() instead.
36 DbgTransportSession::DbgTransportSession()
42 DbgTransportSession::~DbgTransportSession()
44 DbgTransportLog(LC_Proxy, "DbgTransportSession::~DbgTransportSession() called");
46 // No other threads are now using session resources. We're free to deallocate them as we wish (if they
47 // were allocated in the first place).
48 if (m_hTransportThread)
49 CloseHandle(m_hTransportThread);
50 if (m_rghEventReadyEvent[IPCET_OldStyle])
51 CloseHandle(m_rghEventReadyEvent[IPCET_OldStyle]);
52 if (m_rghEventReadyEvent[IPCET_DebugEvent])
53 CloseHandle(m_rghEventReadyEvent[IPCET_DebugEvent]);
55 delete [] m_pEventBuffers;
57 #ifdef RIGHT_SIDE_COMPILE
58 if (m_hSessionOpenEvent)
59 CloseHandle(m_hSessionOpenEvent);
62 CloseHandle(m_hProcessExited);
63 #endif // RIGHT_SIDE_COMPILE
66 m_sStateLock.Destroy();
69 // Allocates initial resources (including starting the transport thread). The session will start in the
70 // SS_Opening state. That is, the RS will immediately start trying to Connect() a connection while the LS will
71 // perform an accept()/Accept() to wait for a connection request. The RS needs an IP address and port number
72 // to initiate connections. These should be given in host byte order. The LS, on the other hand, requires the
73 // addresses of a couple of runtime data structures to service certain debugger requests that may be delivered
74 // once the session is established.
75 #ifdef RIGHT_SIDE_COMPILE
76 HRESULT DbgTransportSession::Init(DWORD pid, HANDLE hProcessExited)
77 #else // RIGHT_SIDE_COMPILE
78 HRESULT DbgTransportSession::Init(DebuggerIPCControlBlock *pDCB, AppDomainEnumerationIPCBlock *pADB)
79 #endif // RIGHT_SIDE_COMPILE
81 _ASSERTE(m_eState == SS_Closed);
83 // Start with a blank slate so that Shutdown() on a partially initialized instance will only do the
85 memset(this, 0, sizeof(*this));
87 // Because of the above memset the embeded classes/structs need to be reinitialized especially
88 // the two way pipe; it expects the in/out handles to be -1 instead of 0.
90 m_pipe = TwoWayPipe();
91 m_sStateLock = DbgTransportLock();
93 // Initialize all per-session state variables.
96 #ifdef RIGHT_SIDE_COMPILE
97 // The RS randomly allocates a session ID which is sent to the LS in the SessionRequest message. In the
98 // case of network errors during session formation this allows the LS to tell SessionRequest re-sends from
99 // a new request from a different RS.
100 HRESULT hr = CoCreateGuid(&m_sSessionID);
103 #endif // RIGHT_SIDE_COMPILE
106 #ifdef RIGHT_SIDE_COMPILE
109 if (!DuplicateHandle(GetCurrentProcess(),
113 0, // ignored since we are going to pass DUPLICATE_SAME_ACCESS
115 DUPLICATE_SAME_ACCESS))
117 return HRESULT_FROM_GetLastError();
120 m_fDebuggerAttached = false;
121 #else // RIGHT_SIDE_COMPILE
124 #endif // RIGHT_SIDE_COMPILE
127 m_fInitStateLock = true;
129 #ifdef RIGHT_SIDE_COMPILE
130 m_hSessionOpenEvent = WszCreateEvent(NULL, TRUE, FALSE, NULL); // Manual reset, not signalled
131 if (m_hSessionOpenEvent == NULL)
132 return E_OUTOFMEMORY;
133 #else // RIGHT_SIDE_COMPILE
134 DWORD pid = GetCurrentProcessId();
135 if (!m_pipe.CreateServer(pid)) {
136 return E_OUTOFMEMORY;
138 #endif // RIGHT_SIDE_COMPILE
140 // Allocate some buffers to receive incoming events. The initial number is chosen arbitrarily, tune as
141 // necessary. This array will need to grow if it fills with unread events (it takes our client a little
142 // time to process each incoming receive). In general, however, one side will not send an unbounded stream
143 // of events to the other without waiting for some kind of response. More usual are small bursts of events
144 // to represent variable sized data (such as a stack trace).
145 m_cEventBuffers = 10;
146 m_pEventBuffers = (DbgEventBufferEntry *)new (nothrow) BYTE[m_cEventBuffers * sizeof(DbgEventBufferEntry)];
147 if (m_pEventBuffers == NULL)
148 return E_OUTOFMEMORY;
150 m_rghEventReadyEvent[IPCET_OldStyle] = WszCreateEvent(NULL, FALSE, FALSE, NULL); // Auto reset, not signalled
151 if (m_rghEventReadyEvent[IPCET_OldStyle] == NULL)
152 return E_OUTOFMEMORY;
154 m_rghEventReadyEvent[IPCET_DebugEvent] = WszCreateEvent(NULL, FALSE, FALSE, NULL); // Auto reset, not signalled
155 if (m_rghEventReadyEvent[IPCET_DebugEvent] == NULL)
156 return E_OUTOFMEMORY;
158 // Start the transport thread which handles forming and re-forming connections, driving the session
159 // state to SS_Open and receiving and initially processing all incoming traffic.
161 m_hTransportThread = CreateThread(NULL, 0, TransportWorkerStatic, this, 0, NULL);
162 if (m_hTransportThread == NULL)
165 return E_OUTOFMEMORY;
171 // Drive the session to the SS_Closed state, which will deallocate all remaining transport resources
172 // (including terminating the transport thread). If this is the RS and the session state is SS_Open at the
173 // time of this call a graceful disconnect will be attempted (which tells the LS to go back to SS_Opening to
174 // look for a new RS rather than interpreting the disconnection as a temporary error and going into
175 // SS_Resync). On either side the session will no longer be functional after this call returns (though Init()
176 // may be called again to start over from the beginning).
177 void DbgTransportSession::Shutdown()
179 DbgTransportLog(LC_Proxy, "DbgTransportSession::Shutdown() called");
181 // The transport thread is allocated last in Init() (since it uses all the other resources that Init()
182 // prepares). Don't do any transport related stuff unless this was allocated (which can happen if
183 // Shutdown() is called after an Init() failure).
185 if (m_hTransportThread)
187 // From SS_Open state try a graceful disconnect.
188 if (m_eState == SS_Open)
190 DbgTransportLog(LC_Session, "Sending 'SessionClose'");
191 DBG_TRANSPORT_INC_STAT(SentSessionClose);
193 sMessage.Init(MT_SessionClose);
194 SendMessage(&sMessage, false);
197 // Must take the state lock to make a state transition.
199 TransportLockHolder sLockHolder(&m_sStateLock);
201 // Remember previous state and transition to SS_Closed.
202 SessionState ePreviousState = m_eState;
203 m_eState = SS_Closed;
205 if (ePreviousState != SS_Closed)
210 } // Leave m_sStateLock
212 #ifdef RIGHT_SIDE_COMPILE
213 // Signal the m_hSessionOpenEvent now to quickly error out any callers of WaitForSessionToOpen().
214 SetEvent(m_hSessionOpenEvent);
215 #endif // RIGHT_SIDE_COMPILE
218 // The transport instance is no longer valid
222 #ifndef RIGHT_SIDE_COMPILE
224 // Cleans up the named pipe connection so no tmp files are left behind. Does only
225 // the minimum and must be safe to call at any time. Called during PAL ExitProcess,
226 // TerminateProcess and for unhandled native exceptions and asserts.
227 void DbgTransportSession::AbortConnection()
232 // API used only by the LS to drive the transport into a state where it won't accept connections. This is used
233 // when no proxy is detected at startup but it's too late to shutdown all of the debugging system easily. It's
234 // mainly paranoia to increase the protection of your system when the proxy isn't started.
235 void DbgTransportSession::Neuter()
237 // Simply set the session state to SS_Closed. The transport thread will switch itself off if it ever gets
238 // a connection but the rest of the transport resources remain valid (so the debugger helper thread won't
239 // AV on a deallocated handle, which might happen if we simply called Shutdown()).
240 m_eState = SS_Closed;
243 #else // RIGHT_SIDE_COMPILE
245 // Used by debugger side (RS) to cleanup the target (LS) named pipes
246 // and semaphores when the debugger detects the debuggee process exited.
247 void DbgTransportSession::CleanupTargetProcess()
249 m_pipe.CleanupTargetProcess();
252 // On the RS it may be useful to wait and see if the session can reach the SS_Open state. If the target
253 // runtime has terminated for some reason then we'll never reach the open state. So the method below gives the
254 // RS a way to try and establish a connection for a reasonable amount of time and to time out otherwise. They
255 // could then call Shutdown on the session and report an error back to the rest of the debugger. The method
256 // returns true if the session opened within the time given (in milliseconds) and false otherwise.
257 bool DbgTransportSession::WaitForSessionToOpen(DWORD dwTimeout)
259 DWORD dwRet = WaitForSingleObject(m_hSessionOpenEvent, dwTimeout);
260 if (m_eState == SS_Closed)
263 if (dwRet == WAIT_TIMEOUT)
264 DbgTransportLog(LC_Proxy, "DbgTransportSession::WaitForSessionToOpen(%u) timed out", dwTimeout);
266 return dwRet == WAIT_OBJECT_0;
269 //---------------------------------------------------------------------------------------
271 // A valid ticket is returned if no other client is currently acting as the debugger.
272 // If the caller passes in a valid ticket, this function will return true without invalidating the ticket.
275 // pTicket - out parameter; set to a valid ticket if the client has successfully registered as the debugger
278 // Return true if the client has successfully registered as the debugger.
281 bool DbgTransportSession::UseAsDebugger(DebugTicket * pTicket)
283 TransportLockHolder sLockHolder(&m_sStateLock);
284 if (m_fDebuggerAttached)
286 if (pTicket->IsValid())
288 // The client already holds a valid ticket.
293 // Another client of this session has already indicated that it's using this session to debug.
294 _ASSERTE(!pTicket->IsValid());
300 m_fDebuggerAttached = true;
306 //---------------------------------------------------------------------------------------
308 // A valid ticket is required in order for this function to succeed. After this function succeeds,
309 // another client can request to be the debugger.
312 // pTicket - the client's ticket; must be valid for this function to succeed
315 // Return true if the client has successfully unregistered as the debugger.
316 // Return false if no client is currently acting as the debugger or if the client's ticket is invalid.
319 bool DbgTransportSession::StopUsingAsDebugger(DebugTicket * pTicket)
321 TransportLockHolder sLockHolder(&m_sStateLock);
322 if (m_fDebuggerAttached && pTicket->IsValid())
324 // The caller is indeed the owner of the debug ticket.
325 m_fDebuggerAttached = false;
326 pTicket->SetInvalid();
334 #endif // RIGHT_SIDE_COMPILE
336 // Sends a pre-initialized event to the other side.
337 HRESULT DbgTransportSession::SendEvent(DebuggerIPCEvent *pEvent)
339 DbgTransportLog(LC_Events, "Sending '%s'", IPCENames::GetName(pEvent->type));
340 DBG_TRANSPORT_INC_STAT(SentEvent);
342 return SendEventWorker(pEvent, IPCET_OldStyle);
345 // Sends a pre-initialized event to the other side, but pretend that this is coming from the native pipeline.
346 // See code:IPCEventType for more information.
347 HRESULT DbgTransportSession::SendDebugEvent(DebuggerIPCEvent * pEvent)
349 DbgTransportLog(LC_Events, "Sending '%s' as DEBUG_EVENT", IPCENames::GetName(pEvent->type));
350 DBG_TRANSPORT_INC_STAT(SentEvent);
352 return SendEventWorker(pEvent, IPCET_DebugEvent);
355 // Retrieves the auto-reset handle which is signalled by the session each time a new event is received from
357 HANDLE DbgTransportSession::GetIPCEventReadyEvent()
359 return m_rghEventReadyEvent[IPCET_OldStyle];
362 // Retrieves the auto-reset handle which is signalled by the session each time a new event (disguised as a
363 // debug event) is received from the other side.
364 HANDLE DbgTransportSession::GetDebugEventReadyEvent()
366 return m_rghEventReadyEvent[IPCET_DebugEvent];
369 // Copies the last event received from the other side into the provided buffer. This should only be called
370 // (once) after the event returned from GetIPCEEventReadyEvent()/GetDebugEventReadyEvent() has been signalled.
371 void DbgTransportSession::GetNextEvent(DebuggerIPCEvent *pEvent, DWORD cbEvent)
373 _ASSERTE(cbEvent <= CorDBIPC_BUFFER_SIZE);
375 // Must acquire the state lock to synchronize us wrt to the transport thread (clients already guarantee
376 // they serialize calls to this and waiting on m_rghEventReadyEvent).
377 TransportLockHolder sLockHolder(&m_sStateLock);
379 // There must be at least one valid event waiting (this call does not block).
380 _ASSERTE(m_cValidEventBuffers);
382 // Copy the first valid event into the client's buffer.
383 memcpy(pEvent, &m_pEventBuffers[m_idxEventBufferHead].m_event, cbEvent);
385 // Move the index of the head of the valid list forward (which may in fact move it back to the start of
386 // the array since the list is circular). This reduces the number of valid entries by one. Note that these
387 // two adjustments do not affect the tail of the list in any way. In the limit case the head will end up
388 // pointing to the same event as the tail (and m_cValidEventBuffers will be zero).
389 m_idxEventBufferHead = (m_idxEventBufferHead + 1) % m_cEventBuffers;
390 m_cValidEventBuffers--;
391 _ASSERTE(((m_idxEventBufferHead + m_cValidEventBuffers) % m_cEventBuffers) == m_idxEventBufferTail);
393 // If there's at least one more valid event we can signal event ready now.
394 if (m_cValidEventBuffers)
396 SetEvent(m_rghEventReadyEvent[m_pEventBuffers[m_idxEventBufferHead].m_type]);
402 void MarshalDCBTransportToDCB(DebuggerIPCControlBlockTransport* pIn, DebuggerIPCControlBlock* pOut)
404 pOut->m_DCBSize = pIn->m_DCBSize;
405 pOut->m_verMajor = pIn->m_verMajor;
406 pOut->m_verMinor = pIn->m_verMinor;
407 pOut->m_checkedBuild = pIn->m_checkedBuild;
408 pOut->m_bHostingInFiber = pIn->m_bHostingInFiber;
409 pOut->padding2 = pIn->padding2;
410 pOut->padding3 = pIn->padding3;
412 pOut->m_leftSideProtocolCurrent = pIn->m_leftSideProtocolCurrent;
413 pOut->m_leftSideProtocolMinSupported = pIn->m_leftSideProtocolMinSupported;
415 pOut->m_rightSideProtocolCurrent = pIn->m_rightSideProtocolCurrent;
416 pOut->m_rightSideProtocolMinSupported = pIn->m_rightSideProtocolMinSupported;
418 pOut->m_errorHR = pIn->m_errorHR;
419 pOut->m_errorCode = pIn->m_errorCode;
421 #if defined(DBG_TARGET_WIN64)
422 pOut->padding4 = pIn->padding4;
423 #endif // DBG_TARGET_WIN64
427 //pOut->m_rightSideEventAvailable
428 //pOut->m_rightSideEventRead
429 //pOut->m_paddingObsoleteLSEA
430 //pOut->m_paddingObsoleteLSER
431 //pOut->m_rightSideProcessHandle
432 //pOut->m_leftSideUnmanagedWaitEvent
434 pOut->m_realHelperThreadId = pIn->m_realHelperThreadId;
435 pOut->m_helperThreadId = pIn->m_helperThreadId;
436 pOut->m_temporaryHelperThreadId = pIn->m_temporaryHelperThreadId;
437 pOut->m_CanaryThreadId = pIn->m_CanaryThreadId;
438 pOut->m_pRuntimeOffsets = pIn->m_pRuntimeOffsets;
439 pOut->m_helperThreadStartAddr = pIn->m_helperThreadStartAddr;
440 pOut->m_helperRemoteStartAddr = pIn->m_helperRemoteStartAddr;
441 pOut->m_specialThreadList = pIn->m_specialThreadList;
444 //pOut->m_receiveBuffer
447 pOut->m_specialThreadListLength = pIn->m_specialThreadListLength;
448 pOut->m_shutdownBegun = pIn->m_shutdownBegun;
449 pOut->m_rightSideIsWin32Debugger = pIn->m_rightSideIsWin32Debugger;
450 pOut->m_specialThreadListDirty = pIn->m_specialThreadListDirty;
452 pOut->m_rightSideShouldCreateHelperThread = pIn->m_rightSideShouldCreateHelperThread;
456 void MarshalDCBToDCBTransport(DebuggerIPCControlBlock* pIn, DebuggerIPCControlBlockTransport* pOut)
458 pOut->m_DCBSize = pIn->m_DCBSize;
459 pOut->m_verMajor = pIn->m_verMajor;
460 pOut->m_verMinor = pIn->m_verMinor;
461 pOut->m_checkedBuild = pIn->m_checkedBuild;
462 pOut->m_bHostingInFiber = pIn->m_bHostingInFiber;
463 pOut->padding2 = pIn->padding2;
464 pOut->padding3 = pIn->padding3;
466 pOut->m_leftSideProtocolCurrent = pIn->m_leftSideProtocolCurrent;
467 pOut->m_leftSideProtocolMinSupported = pIn->m_leftSideProtocolMinSupported;
469 pOut->m_rightSideProtocolCurrent = pIn->m_rightSideProtocolCurrent;
470 pOut->m_rightSideProtocolMinSupported = pIn->m_rightSideProtocolMinSupported;
472 pOut->m_errorHR = pIn->m_errorHR;
473 pOut->m_errorCode = pIn->m_errorCode;
475 #if defined(DBG_TARGET_WIN64)
476 pOut->padding4 = pIn->padding4;
477 #endif // DBG_TARGET_WIN64
479 pOut->m_realHelperThreadId = pIn->m_realHelperThreadId;
480 pOut->m_helperThreadId = pIn->m_helperThreadId;
481 pOut->m_temporaryHelperThreadId = pIn->m_temporaryHelperThreadId;
482 pOut->m_CanaryThreadId = pIn->m_CanaryThreadId;
483 pOut->m_pRuntimeOffsets = pIn->m_pRuntimeOffsets;
484 pOut->m_helperThreadStartAddr = pIn->m_helperThreadStartAddr;
485 pOut->m_helperRemoteStartAddr = pIn->m_helperRemoteStartAddr;
486 pOut->m_specialThreadList = pIn->m_specialThreadList;
488 pOut->m_specialThreadListLength = pIn->m_specialThreadListLength;
489 pOut->m_shutdownBegun = pIn->m_shutdownBegun;
490 pOut->m_rightSideIsWin32Debugger = pIn->m_rightSideIsWin32Debugger;
491 pOut->m_specialThreadListDirty = pIn->m_specialThreadListDirty;
493 pOut->m_rightSideShouldCreateHelperThread = pIn->m_rightSideShouldCreateHelperThread;
498 #ifdef RIGHT_SIDE_COMPILE
499 // Read and write memory on the LS from the RS.
500 HRESULT DbgTransportSession::ReadMemory(PBYTE pbRemoteAddress, PBYTE pbBuffer, SIZE_T cbBuffer)
502 DbgTransportLog(LC_Requests, "Sending 'ReadMemory(0x%08X, %u)'", pbRemoteAddress, cbBuffer);
503 DBG_TRANSPORT_INC_STAT(SentReadMemory);
506 sMessage.Init(MT_ReadMemory, NULL, 0, pbBuffer, (DWORD)cbBuffer);
507 sMessage.m_sHeader.TypeSpecificData.MemoryAccess.m_pbLeftSideBuffer = pbRemoteAddress;
508 sMessage.m_sHeader.TypeSpecificData.MemoryAccess.m_cbLeftSideBuffer = (DWORD)cbBuffer;
510 HRESULT hr = SendRequestMessageAndWait(&sMessage);
514 // If we reached here the send was successful but the actual memory operation may not have been (due to
515 // unmapped memory or page protections etc.). So the final result comes back to us in the reply.
516 return sMessage.m_sHeader.TypeSpecificData.MemoryAccess.m_hrResult;
519 HRESULT DbgTransportSession::WriteMemory(PBYTE pbRemoteAddress, PBYTE pbBuffer, SIZE_T cbBuffer)
521 DbgTransportLog(LC_Requests, "Sending 'WriteMemory(0x%08X, %u)'", pbRemoteAddress, cbBuffer);
522 DBG_TRANSPORT_INC_STAT(SentWriteMemory);
525 sMessage.Init(MT_WriteMemory, pbBuffer, (DWORD)cbBuffer);
526 sMessage.m_sHeader.TypeSpecificData.MemoryAccess.m_pbLeftSideBuffer = pbRemoteAddress;
527 sMessage.m_sHeader.TypeSpecificData.MemoryAccess.m_cbLeftSideBuffer = (DWORD)cbBuffer;
529 HRESULT hr = SendRequestMessageAndWait(&sMessage);
533 // If we reached here the send was successful but the actual memory operation may not have been (due to
534 // unmapped memory or page protections etc.). So the final result comes back to us in the reply.
535 return sMessage.m_sHeader.TypeSpecificData.MemoryAccess.m_hrResult;
538 HRESULT DbgTransportSession::VirtualUnwind(DWORD threadId, ULONG32 contextSize, PBYTE context)
540 DbgTransportLog(LC_Requests, "Sending 'VirtualUnwind'");
541 DBG_TRANSPORT_INC_STAT(SentVirtualUnwind);
544 sMessage.Init(MT_VirtualUnwind, context, contextSize, context, contextSize);
545 return SendRequestMessageAndWait(&sMessage);
548 // Read and write the debugger control block on the LS from the RS.
549 HRESULT DbgTransportSession::GetDCB(DebuggerIPCControlBlock *pDCB)
551 DbgTransportLog(LC_Requests, "Sending 'GetDCB'");
552 DBG_TRANSPORT_INC_STAT(SentGetDCB);
555 DebuggerIPCControlBlockTransport dcbt;
556 sMessage.Init(MT_GetDCB, NULL, 0, (PBYTE)&dcbt, sizeof(DebuggerIPCControlBlockTransport));
557 HRESULT ret = SendRequestMessageAndWait(&sMessage);
559 MarshalDCBTransportToDCB(&dcbt, pDCB);
563 HRESULT DbgTransportSession::SetDCB(DebuggerIPCControlBlock *pDCB)
565 DbgTransportLog(LC_Requests, "Sending 'SetDCB'");
566 DBG_TRANSPORT_INC_STAT(SentSetDCB);
568 DebuggerIPCControlBlockTransport dcbt;
569 MarshalDCBToDCBTransport(pDCB, &dcbt);
572 sMessage.Init(MT_SetDCB, (PBYTE)&dcbt, sizeof(DebuggerIPCControlBlockTransport));
573 return SendRequestMessageAndWait(&sMessage);
577 // Read the AppDomain control block on the LS from the RS.
578 HRESULT DbgTransportSession::GetAppDomainCB(AppDomainEnumerationIPCBlock *pADB)
580 DbgTransportLog(LC_Requests, "Sending 'GetAppDomainCB'");
581 DBG_TRANSPORT_INC_STAT(SentGetAppDomainCB);
584 sMessage.Init(MT_GetAppDomainCB, NULL, 0, (PBYTE)pADB, sizeof(AppDomainEnumerationIPCBlock));
585 return SendRequestMessageAndWait(&sMessage);
588 #endif // RIGHT_SIDE_COMPILE
590 // Worker function for code:DbgTransportSession::SendEvent and code:DbgTransportSession::SendDebugEvent.
591 HRESULT DbgTransportSession::SendEventWorker(DebuggerIPCEvent * pEvent, IPCEventType type)
593 DWORD cbEvent = GetEventSize(pEvent);
594 _ASSERTE(cbEvent <= CorDBIPC_BUFFER_SIZE);
597 sMessage.Init(MT_Event, (PBYTE)pEvent, cbEvent);
599 // Store the event type in the header as well, it's sometimes useful for debugging.
600 sMessage.m_sHeader.TypeSpecificData.Event.m_eIPCEventType = type;
601 sMessage.m_sHeader.TypeSpecificData.Event.m_eType = pEvent->type;
603 return SendMessage(&sMessage, false);
606 // Sends a pre-formatted message (including the data block, if any). The fWaitsForReply indicates whether the
607 // caller is going to block until some sort of reply message is received (for instance an event that must be
608 // ack'd or a request such as MT_GetDCB that needs a reply). SendMessage() uses this to determine whether it
609 // needs to buffer the message before placing it on the send queue (since it may need to resend the message
610 // after a transitory network failure).
611 HRESULT DbgTransportSession::SendMessage(Message *pMessage, bool fWaitsForReply)
613 // Serialize the whole operation under the state lock. In particular we need to make allocating the
614 // message ID atomic wrt placing the message on the connection (to ensure our IDs are seen in order by the
615 // other side). We also need to hold the lock while manipulating the send queue (to prevent corruption)
616 // and while determining whether to send immediately or not depending on the session state (to avoid
617 // posting a send on a closed and possibly recycled socket).
619 TransportLockHolder sLockHolder(&m_sStateLock);
621 // Perform any last updates to the header or data block here since we might be about to encrypt them.
623 // Give this message a unique ID (useful both to track which messages need to be resent on a network
624 // failure and to match replies to the original message).
625 pMessage->m_sHeader.m_dwId = m_dwNextMessageId++;
627 // Use this message send to piggyback an acknowledgement of the last message we processed from the
628 // other side (this will allow the other side to discard one or more buffered messages from its send
630 pMessage->m_sHeader.m_dwLastSeenId = m_dwLastMessageIdSeen;
632 // If the caller isn't waiting around for a reply we must make a copy of the message to place on the
634 pMessage->m_pOrigMessage = pMessage;
635 Message *pMessageCopy = NULL;
636 PBYTE pDataBlockCopy = NULL;
639 // Allocate a new message (includes an embedded message header).
640 pMessageCopy = new (nothrow) Message();
641 if (pMessageCopy == NULL)
642 return E_OUTOFMEMORY;
644 // Allocate a new data block if one is being used.
645 if (pMessage->m_pbDataBlock)
647 pDataBlockCopy = new (nothrow) BYTE[pMessage->m_cbDataBlock];
648 if (pDataBlockCopy == NULL)
651 return E_OUTOFMEMORY;
655 // Copy the message descriptor over.
656 memcpy(pMessageCopy, pMessage, sizeof(Message));
658 // And the data block if applicable.
660 memcpy(pDataBlockCopy, pMessage->m_pbDataBlock, pMessage->m_cbDataBlock);
662 // The message copy still points to the wrong data block (if there is one).
663 pMessageCopy->m_pbDataBlock = pDataBlockCopy;
665 // Point the copy back to the original message.
666 pMessageCopy->m_pOrigMessage = pMessage;
668 // From now on we'll use the copy.
669 pMessage = pMessageCopy;
672 // Check the session state.
673 if (m_eState == SS_Closed)
675 // SS_Closed is bad news, we'll never recover from that so error the send immediately.
679 delete [] pDataBlockCopy;
684 // Don't queue session management messages. We always recreate these if we need to re-send them.
685 if (pMessage->m_sHeader.m_eType > MT_SessionClose)
687 // Regardless of session state we always queue the message for at least as long as it takes us to
688 // be sure the other side has received the message.
689 if (m_pSendQueueLast == NULL)
691 // Queue is currently empty.
692 m_pSendQueueFirst = pMessage;
693 m_pSendQueueLast = pMessage;
694 pMessage->m_pNext = NULL;
698 // Place on end of queue.
699 m_pSendQueueLast->m_pNext = pMessage;
700 m_pSendQueueLast = pMessage;
701 pMessage->m_pNext = NULL;
705 // If the state is SS_Open we can send the message now.
706 if (m_eState == SS_Open)
708 // Send the message header block followed by the data block if it's provided. Any network error will
709 // be reported internally by SendBlock and result in a transition to the SS_Resync_NC state (and an
710 // eventual resend of the data).
711 if (SendBlock((PBYTE)&pMessage->m_sHeader, sizeof(MessageHeader)) && pMessage->m_pbDataBlock)
712 SendBlock(pMessage->m_pbDataBlock, pMessage->m_cbDataBlock);
715 // If the state wasn't open there's nothing more to be done. The state will eventually transition to
716 // either SS_Open (in which case the transport thread will send all pending messages for us at the
717 // transition point) or SS_Closed (where the transport thread will drain the queue and discard each
718 // message, setting m_fAborted if necessary).
720 } // Leave m_sStateLock
725 // Helper method for sending messages requiring a reply (such as MT_GetDCB) and waiting on the result.
726 HRESULT DbgTransportSession::SendRequestMessageAndWait(Message *pMessage)
728 // Allocate event to wait for reply on.
729 pMessage->m_hReplyEvent = WszCreateEvent(NULL, FALSE, FALSE, NULL); // Auto-reset, not signalled
730 if (pMessage->m_hReplyEvent == NULL)
731 return E_OUTOFMEMORY;
733 // Duplicate the handle to the event. It's necessary to have two handles to the same event because
734 // both this thread and the message pumping thread may be trying to access the handle at the same
735 // time (e.g. closing the handle). So we make a duplicate handle. This thread is responsible for
736 // closing hReplyEvent (the local variable) whereas the message pumping thread is responsible for
737 // closing the handle on the message.
738 HANDLE hReplyEvent = NULL;
739 if (!DuplicateHandle(GetCurrentProcess(),
740 pMessage->m_hReplyEvent,
743 0, // ignored since we are going to pass DUPLICATE_SAME_ACCESS
745 DUPLICATE_SAME_ACCESS))
747 return HRESULT_FROM_GetLastError();
751 HRESULT hr = SendMessage(pMessage, true);
754 // In this case, we need to close both handles since the message is never put into the send queue.
755 // This thread is the only one who has access to the message.
756 CloseHandle(pMessage->m_hReplyEvent);
757 CloseHandle(hReplyEvent);
761 // At this point, the message pumping thread may receive the reply any time. It may even receive the
762 // reply message even before we wait on the event. Keep this in mind.
764 // Wait for a reply (by the time this event is signalled the message header will have been overwritten by
765 // the reply and any output buffer provided will have been filled in).
766 #if defined(RIGHT_SIDE_COMPILE)
767 HANDLE rgEvents[] = { hReplyEvent, m_hProcessExited };
768 #else // !RIGHT_SIDE_COMPILE
769 HANDLE rgEvents[] = { hReplyEvent };
770 #endif // RIGHT_SIDE_COMPILE
772 DWORD dwResult = WaitForMultipleObjectsEx(sizeof(rgEvents)/sizeof(rgEvents[0]), rgEvents, FALSE, INFINITE, FALSE);
774 if (dwResult == WAIT_OBJECT_0)
776 // This is the normal case. The message pumping thread receives a reply from the debuggee process.
777 // It signals the event to wake up this thread.
778 CloseHandle(hReplyEvent);
780 // Check whether the session aborted us due to a Shutdown().
781 if (pMessage->m_fAborted)
784 #if defined(RIGHT_SIDE_COMPILE)
785 else if (dwResult == (WAIT_OBJECT_0 + 1))
787 // This is the complicated case. This thread wakes up because the debuggee process is terminated.
788 // At the same time, the message pumping thread may be in the process of handling the reply message.
789 // We need to be careful here because there is a race condition.
791 // Remove the original message from the send queue. This is because in the case of a blocking message,
792 // the message can be allocated on the stack. Thus, the message becomes invalid when we return from
793 // this function. The message pumping thread may have beaten this thread to it. That's ok since
794 // RemoveMessageFromSendQueue() takes the state lock.
795 Message * pOriginalMessage = RemoveMessageFromSendQueue(pMessage->m_sHeader.m_dwId);
796 _ASSERTE((pOriginalMessage == NULL) || (pOriginalMessage == pMessage));
798 // If the message pumping thread has beaten this thread to removing the original message, then this
799 // thread must wait until the message pumping thread is done with the message before returning.
800 // Otherwise, the message may become invalid when the message pumping thread is accessing it.
801 // Fortunately, in this case, we know the message pumping thread is going to signal the event.
802 if (pOriginalMessage == NULL)
804 WaitForSingleObject(hReplyEvent, INFINITE);
807 CloseHandle(hReplyEvent);
808 return CORDBG_E_PROCESS_TERMINATED;
810 #endif // RIGHT_SIDE_COMPILE
813 // Should never get here.
814 CloseHandle(hReplyEvent);
821 // Sends a single contiguous buffer of host memory over the connection. The caller is responsible for holding
822 // the state lock and ensuring the session state is SS_Open. Returns false if the send failed (the error will
823 // have already caused the recovery logic to kick in, so handling it is not required, the boolean is just
824 // returned so that any further blocks in the message are not sent).
825 bool DbgTransportSession::SendBlock(PBYTE pbBuffer, DWORD cbBuffer)
827 _ASSERTE(m_eState == SS_Opening || m_eState == SS_Resync || m_eState == SS_Open);
828 _ASSERTE(m_pipe.GetState() == TwoWayPipe::ServerConnected || m_pipe.GetState() == TwoWayPipe::ClientConnected);
829 _ASSERTE(cbBuffer > 0);
831 DBG_TRANSPORT_INC_STAT(SentBlocks);
832 DBG_TRANSPORT_ADD_STAT(SentBytes, cbBuffer);
834 //DbgTransportLog(LC_Proxy, "SendBlock(%08X, %u)", pbBuffer, cbBuffer);
836 if (DBG_TRANSPORT_SHOULD_INJECT_FAULT(Send))
839 fSuccess = (m_pipe.Write(pbBuffer, cbBuffer) == cbBuffer);
843 DbgTransportLog(LC_NetErrors, "Network error on Send()");
844 DBG_TRANSPORT_INC_STAT(SendErrors);
845 HandleNetworkError(true);
852 // Receives a single contiguous buffer of host memory over the connection. No state lock needs to be held
853 // (receives are serialized by the fact they're only performed on the transport thread). Returns false if a
854 // network error is encountered (which will automatically transition the session into the correct retry
856 bool DbgTransportSession::ReceiveBlock(PBYTE pbBuffer, DWORD cbBuffer)
858 _ASSERTE(m_pipe.GetState() == TwoWayPipe::ServerConnected || m_pipe.GetState() == TwoWayPipe::ClientConnected);
859 _ASSERTE(cbBuffer > 0);
861 DBG_TRANSPORT_INC_STAT(ReceivedBlocks);
862 DBG_TRANSPORT_ADD_STAT(ReceivedBytes, cbBuffer);
864 //DbgTransportLog(LC_Proxy, "ReceiveBlock(%08X, %u)", pbBuffer, cbBuffer);
867 if (DBG_TRANSPORT_SHOULD_INJECT_FAULT(Receive))
870 fSuccess = (m_pipe.Read(pbBuffer, cbBuffer) == cbBuffer);
874 DbgTransportLog(LC_NetErrors, "Network error on Receive()");
875 DBG_TRANSPORT_INC_STAT(ReceiveErrors);
876 HandleNetworkError(false);
883 // Called upon encountering a network error (e.g. an error from Send() or Receive()). This handles pushing the
884 // session state into SS_Resync_NC or SS_Opening_NC in order to start the recovery process.
885 void DbgTransportSession::HandleNetworkError(bool fCallerHoldsStateLock)
887 _ASSERTE(m_eState == SS_Open || m_eState == SS_Opening || m_eState == SS_Resync || !fCallerHoldsStateLock);
889 // Check the easy cases first which don't require us to take the lock (because we don't transition the
890 // state). These are the SS_Closed state (a network error doesn't matter when we're closing down the
891 // session anyway) and the SS_*_NC states (which indicate someone else beat us to it, closed the
892 // connection and has started recovery).
893 if (m_eState == SS_Closed ||
894 m_eState == SS_Opening_NC ||
895 m_eState == SS_Resync_NC)
898 // We need the state lock to perform a state transition.
899 if (!fCallerHoldsStateLock)
900 m_sStateLock.Enter();
907 // Still need to cope with the no-op states handled above since we could have transitioned into them
908 // before we took the lock.
912 // All work to transition SS_Opening to SS_Open is performed by the transport thread, so we know we're
913 // on that thread. Consequently it's just enough to set the state to SS_Opening_NC and the thread will
914 // notice the change when the SendMessage() or ReceiveBlock() call completes.
915 m_eState = SS_Opening_NC;
919 // Likewise, all the work to transition SS_Resync to SS_Open is performed by the transport thread, so
920 // we know we're on that thread.
921 m_eState = SS_Resync_NC;
925 // The state change to SS_Resync_NC will prompt the transport thread (which might be this thread) that
926 // it should discard the current connection and reform a new one. It will also cause sends to be
927 // queued instead of sent. In case we're not the transport thread and instead it is currently stuck in
928 // a Receive (I don't entirely trust the connection to immediately fail these on a network problem)
929 // we'll call CancelReceive() to abort the operation. The transport thread itself will handle the
930 // actual Destroy() (having one thread do this management greatly simplifies things).
931 m_eState = SS_Resync_NC;
936 _ASSERTE(!"Unknown session state");
939 if (!fCallerHoldsStateLock)
940 m_sStateLock.Leave();
943 // Scan the send queue and discard any messages which have been processed by the other side according to the
944 // specified ID). Messages waiting on a reply message (e.g. MT_GetDCB) will be retained until that reply is
945 // processed. FlushSendQueue will take the state lock.
946 void DbgTransportSession::FlushSendQueue(DWORD dwLastProcessedId)
948 // Must access the send queue under the state lock.
949 TransportLockHolder sLockHolder(&m_sStateLock);
951 // Note that message headers (and data blocks) may be encrypted. Use the cached fields in the Message
952 // structure to compare message IDs and types.
954 Message *pMsg = m_pSendQueueFirst;
955 Message *pLastMsg = NULL;
958 if (pMsg->m_sHeader.m_dwId <= dwLastProcessedId)
960 // Message has been seen and processed by other side.
961 // Check if we can discard it (i.e. it's not waiting on a reply message that needs the original
962 // request to hang around).
963 #ifdef RIGHT_SIDE_COMPILE
964 MessageType eType = pMsg->m_sHeader.m_eType;
965 if (eType != MT_ReadMemory &&
966 eType != MT_WriteMemory &&
967 eType != MT_VirtualUnwind &&
968 eType != MT_GetDCB &&
969 eType != MT_SetDCB &&
970 eType != MT_GetAppDomainCB)
971 #endif // RIGHT_SIDE_COMPILE
973 #ifdef RIGHT_SIDE_COMPILE
974 _ASSERTE(eType == MT_Event);
975 #endif // RIGHT_SIDE_COMPILE
977 // We can discard this message.
979 // Unlink it from the queue.
980 if (pLastMsg == NULL)
981 m_pSendQueueFirst = pMsg->m_pNext;
983 pLastMsg->m_pNext = pMsg->m_pNext;
984 if (m_pSendQueueLast == pMsg)
985 m_pSendQueueLast = pLastMsg;
987 Message *pDiscardMsg = pMsg;
988 pMsg = pMsg->m_pNext;
990 // If the message is a copy deallocate it (and the data block associated with it).
991 if (pDiscardMsg->m_pOrigMessage != pDiscardMsg)
993 if (pDiscardMsg->m_pbDataBlock)
994 delete [] pDiscardMsg->m_pbDataBlock;
1003 pMsg = pMsg->m_pNext;
1007 #ifdef RIGHT_SIDE_COMPILE
1008 // Perform processing required to complete a request (such as MT_GetDCB) once a reply comes in. This includes
1009 // reading data from the connection into the output buffer, removing the original message from the send queue
1010 // and signalling the completion event. Returns true if no network error was encountered.
1011 bool DbgTransportSession::ProcessReply(MessageHeader *pHeader)
1013 // Locate original message on the send queue.
1014 Message *pMsg = RemoveMessageFromSendQueue(pHeader->m_dwReplyId);
1016 // This can happen if the thread blocked waiting for the replyl message has waken up because the debuggee
1017 // process has terminated. See code:DbgTransportSession::SendRequestMessageAndWait() for more info.
1023 // If there is a reply block but the caller hasn't specified a reply buffer.
1024 // This combination is not used any more.
1025 _ASSERTE(! ((pHeader->m_cbDataBlock != (DWORD)0) && (pMsg->m_pbReplyBlock == (PBYTE)NULL)) );
1027 // If there was an output buffer provided then we copy the data block in the reply into it (perhaps
1028 // decrypting it first). If the reply header indicates there is no data block then presumably the request
1029 // failed (which should be indicated in the TypeSpecificData of the reply, ala MT_ReadMemory).
1030 if (pMsg->m_pbReplyBlock && pHeader->m_cbDataBlock)
1032 _ASSERTE(pHeader->m_cbDataBlock == pMsg->m_cbReplyBlock);
1033 if (!ReceiveBlock(pMsg->m_pbReplyBlock, pMsg->m_cbReplyBlock))
1035 // Whoops. We hit an error trying to read the reply data. We need to push the original message
1036 // back on the queue and await a retry. Since this message must have been seen by the other side
1037 // we don't need to put it on the queue in order (it will never be resent). Easiest just to put it
1040 TransportLockHolder sLockHolder(&m_sStateLock);
1041 pMsg->m_pNext = m_pSendQueueFirst;
1042 m_pSendQueueFirst = pMsg;
1043 if (m_pSendQueueLast == NULL)
1044 m_pSendQueueLast = pMsg;
1046 } // Leave m_sStateLock
1050 // Copy TypeSpecificData from the reply back into the original message (it can contain additional status).
1051 // Be careful to update the real original message (the version on the queue will be a copy if we're using
1052 // a secure session).
1053 pMsg->m_pOrigMessage->m_sHeader.TypeSpecificData = pHeader->TypeSpecificData;
1055 // **** IMPORTANT NOTE ****
1056 // We're about to cause a side-effect visible to our client. From here on out (until we update the
1057 // session's idea of the last incoming message we processed back in the transport thread's main loop) we
1058 // must avoid any failures. If we fail before the update the other side will re-send the message which is
1059 // bad if we've already processed it. See the comment near the start of the SS_Open message dispatch logic
1060 // for more details.
1061 // **** IMPORTANT NOTE ****
1063 // Signal the completion event.
1064 SignalReplyEvent(pMsg);
1069 //---------------------------------------------------------------------------------------
1071 // Upon receiving a reply message, signal the event on the message to wake up the thread waiting for
1072 // the reply message and close the handle to the event.
1075 // pMessage - the reply message to be processed
1078 void DbgTransportSession::SignalReplyEvent(Message * pMessage)
1080 // Make a local copy of the event handle. As soon as we signal the event, the thread blocked waiting on
1081 // the reply may wake up and trash the message. See code:DbgTransportSession::SendRequestMessageAndWait()
1083 HANDLE hReplyEvent = pMessage->m_hReplyEvent;
1084 _ASSERTE(hReplyEvent != NULL);
1086 SetEvent(hReplyEvent);
1087 CloseHandle(hReplyEvent);
1090 //---------------------------------------------------------------------------------------
1092 // Given a message ID, find the matching message in the send queue. If there is no match, return NULL.
1093 // If there is a match, remove the message from the send queue and return it.
1096 // dwMessageId - the ID of the message to retrieve
1099 // NULL if the specified message cannot be found.
1100 // Otherwise return the specified message with the side effect that it's also removed from the send queue.
1103 // The caller is NOT responsible for taking the state lock. This function will do that.
1106 DbgTransportSession::Message * DbgTransportSession::RemoveMessageFromSendQueue(DWORD dwMessageId)
1108 // Locate original message on the send queue.
1109 Message *pMsg = NULL;
1111 TransportLockHolder sLockHolder(&m_sStateLock);
1113 pMsg = m_pSendQueueFirst;
1114 Message *pLastMsg = NULL;
1118 if (dwMessageId == pMsg->m_sHeader.m_dwId)
1120 // Found the original message that this is a reply to. Unlink it.
1121 if (pLastMsg == NULL)
1122 m_pSendQueueFirst = pMsg->m_pNext;
1124 pLastMsg->m_pNext = pMsg->m_pNext;
1126 if (m_pSendQueueLast == pMsg)
1127 m_pSendQueueLast = pLastMsg;
1132 pMsg = pMsg->m_pNext;
1134 } // Leave m_sStateLock
1141 #ifndef RIGHT_SIDE_COMPILE
1144 __attribute__((noinline))
1145 __attribute__((optnone))
1147 ProbeMemory(__in_ecount(cbBuffer) volatile PBYTE pbBuffer, DWORD cbBuffer, bool fWriteAccess)
1149 // Need an throw in this function to fool the C++ runtime into handling the
1150 // possible h/w exception below.
1151 if (pbBuffer == NULL)
1153 throw PAL_SEHException();
1156 // Simple one byte at a time probing
1157 while (cbBuffer > 0)
1159 volatile BYTE read = *pbBuffer;
1168 #endif // FEATURE_PAL
1170 // Check read and optionally write memory access to the specified range of bytes. Used to check
1171 // ReadProcessMemory and WriteProcessMemory requests.
1172 HRESULT DbgTransportSession::CheckBufferAccess(__in_ecount(cbBuffer) PBYTE pbBuffer, DWORD cbBuffer, bool fWriteAccess)
1174 // check for integer overflow
1175 if ((pbBuffer + cbBuffer) < pbBuffer)
1177 return HRESULT_FROM_WIN32(ERROR_ARITHMETIC_OVERFLOW);
1180 // VirtualQuery doesn't know much about memory allocated outside of PAL's VirtualAlloc
1181 // that's why on Unix we can't rely on in to detect invalid memory reads
1185 // Find the attributes of the largest set of pages with common attributes starting from our base address.
1186 MEMORY_BASIC_INFORMATION sMemInfo;
1187 VirtualQuery(pbBuffer, &sMemInfo, sizeof(sMemInfo));
1189 DbgTransportLog(LC_Proxy, "CBA(%08X,%08X): State:%08X Protect:%08X BA:%08X RS:%08X",
1190 pbBuffer, cbBuffer, sMemInfo.State, sMemInfo.Protect, sMemInfo.BaseAddress, sMemInfo.RegionSize);
1192 // The memory must be committed (i.e. have physical pages or backing store).
1193 if (sMemInfo.State != MEM_COMMIT)
1194 return HRESULT_FROM_WIN32(ERROR_INVALID_ADDRESS);
1196 // Check for compatible page protections. Lower byte of Protect has these (upper bytes have options we're
1197 // not interested in, cache modes and the like.
1198 DWORD dwProtect = sMemInfo.Protect & 0xff;
1201 ((dwProtect & (PAGE_EXECUTE_READWRITE | PAGE_EXECUTE_WRITECOPY | PAGE_READWRITE | PAGE_WRITECOPY)) == 0))
1202 return HRESULT_FROM_WIN32(ERROR_NOACCESS);
1203 else if (!fWriteAccess &&
1204 ((dwProtect & (PAGE_EXECUTE_READ | PAGE_EXECUTE_READWRITE | PAGE_EXECUTE_WRITECOPY | PAGE_READONLY | PAGE_READWRITE | PAGE_WRITECOPY)) == 0))
1205 return HRESULT_FROM_WIN32(ERROR_NOACCESS);
1207 // If the requested range is bigger than the region we have queried,
1208 // we need to continue on to check the next region.
1209 if ((pbBuffer + cbBuffer) > ((PBYTE)sMemInfo.BaseAddress + sMemInfo.RegionSize))
1211 PBYTE pbRegionEnd = reinterpret_cast<PBYTE>(sMemInfo.BaseAddress) + sMemInfo.RegionSize;
1212 cbBuffer = (DWORD)((pbBuffer + cbBuffer) - pbRegionEnd);
1213 pbBuffer = pbRegionEnd;
1217 // We are done. Set cbBuffer to 0 to exit this loop.
1221 while (cbBuffer > 0);
1225 // Need to explicit h/w exception holder so to catch them in ProbeMemory
1226 CatchHardwareExceptionHolder __catchHardwareException;
1228 ProbeMemory(pbBuffer, cbBuffer, fWriteAccess);
1232 return HRESULT_FROM_WIN32(ERROR_INVALID_ADDRESS);
1236 // The specified region has passed all of our checks.
1240 #endif // !RIGHT_SIDE_COMPILE
1242 // Initialize all session state to correct starting values. Used during Init() and on the LS when we
1243 // gracefully close one session and prepare for another.
1244 void DbgTransportSession::InitSessionState()
1246 DBG_TRANSPORT_INC_STAT(Sessions);
1248 m_dwMajorVersion = kCurrentMajorVersion;
1249 m_dwMinorVersion = kCurrentMinorVersion;
1251 memset(&m_sSessionID, 0, sizeof(m_sSessionID));
1253 m_pSendQueueFirst = NULL;
1254 m_pSendQueueLast = NULL;
1256 m_dwNextMessageId = 1;
1257 m_dwLastMessageIdSeen = 0;
1259 m_eState = SS_Opening_NC;
1261 m_cValidEventBuffers = 0;
1262 m_idxEventBufferHead = 0;
1263 m_idxEventBufferTail = 0;
1266 // The entry point of the transport worker thread. This one's static, so we immediately dispatch to an
1267 // instance method version defined below for convenience in the implementation.
1268 DWORD WINAPI DbgTransportSession::TransportWorkerStatic(LPVOID pvContext)
1270 ((DbgTransportSession*)pvContext)->TransportWorker();
1272 // Nobody looks at this result, the choice of 0 is arbitrary.
1276 // Macros used to simplify error and state transition handling within the transport worker loop. Errors are
1277 // classified as either transient or critical. Transient errors (typically those from network operations)
1278 // result in the connection being closed and rebuilt: we should eventually recover from them. Critical errors
1279 // are those that cause a transition to the SS_Closed state, which the session never recovers from. These are
1280 // normally due to protocol errors where we want to shut the transport down in case they are of malicious
1282 #define HANDLE_TRANSIENT_ERROR() do { \
1283 HandleNetworkError(false); \
1284 m_pipe.Disconnect(); \
1285 goto ResetConnection; \
1288 #define HANDLE_CRITICAL_ERROR() do { \
1289 m_eState = SS_Closed; \
1294 #pragma warning(push)
1295 #pragma warning(disable:21000) // Suppress PREFast warning about overly large function
1297 void DbgTransportSession::TransportWorker()
1299 _ASSERTE(m_eState == SS_Opening_NC);
1301 // Loop until shutdown. Each loop iteration involves forming a connection (or waiting for one to form)
1302 // followed by processing incoming messages on that connection until there's a failure (either here of
1303 // from a send on another thread) or the session shuts down. The connection is then closed and discarded
1304 // and we either go round the loop again (to recover our previous session state) or exit the method as
1305 // part of shutdown.
1307 while (m_eState != SS_Closed)
1309 _ASSERTE(m_eState == SS_Opening_NC || m_eState == SS_Resync_NC || m_eState == SS_Closed);
1311 DbgTransportLog(LC_Proxy, "Forming new connection");
1313 #ifdef RIGHT_SIDE_COMPILE
1314 // The session is definitely not open at this point.
1315 ResetEvent(m_hSessionOpenEvent);
1317 // On the right side we initiate the connection via Connect(). A failure is dealt with by waiting a
1318 // little while and retrying (the LS may take a little while to set up). If there's nobody listening
1319 // the debugger will eventually get bored waiting for us and shutdown the session, which will
1320 // terminate this loop.
1322 if (DBG_TRANSPORT_SHOULD_INJECT_FAULT(Connect))
1323 eStatus = SCS_NetworkFailure;
1326 if (m_pipe.Connect(m_pid))
1328 eStatus = SCS_Success;
1332 //not really sure that this is the real failure
1333 //TODO: we probably need to analyse GetErrorCode() here
1334 eStatus = SCS_NoListener;
1338 if (eStatus != SCS_Success)
1340 DbgTransportLog(LC_Proxy, "AllocateConnection() failed with %u\n", eStatus);
1341 DBG_TRANSPORT_INC_STAT(MiscErrors);
1342 _ASSERTE(m_pipe.GetState() != TwoWayPipe::ClientConnected);
1346 #else // RIGHT_SIDE_COMPILE
1348 if (DBG_TRANSPORT_SHOULD_INJECT_FAULT(Accept))
1349 eStatus = SCS_NetworkFailure;
1352 DWORD pid = GetCurrentProcessId();
1353 if ((m_pipe.GetState() == TwoWayPipe::Created || m_pipe.CreateServer(pid)) &&
1354 m_pipe.WaitForConnection())
1356 eStatus = SCS_Success;
1360 //not really sure that this is the real failure
1361 //TODO: we probably need to analyse GetErrorCode() here
1362 eStatus = SCS_NoListener;
1366 if (eStatus != SCS_Success)
1368 DbgTransportLog(LC_Proxy, "Accept() failed with %u\n", eStatus);
1369 DBG_TRANSPORT_INC_STAT(MiscErrors);
1370 _ASSERTE(m_pipe.GetState() != TwoWayPipe::ServerConnected);
1375 // Note that when resynching a session we may let in a connection from a different debugger. That's
1376 // OK, we'll reject his SessionRequest message in due course and drop the connection.
1377 #endif // RIGHT_SIDE_COMPILE
1379 DBG_TRANSPORT_INC_STAT(Connections);
1381 // We now have a connection. Transition to the next state (either SS_Opening or SS_Resync). The
1382 // primary purpose of this state transition is to let other threads know that this thread might now be
1383 // blocked on a Receive() on the newly formed connection (important if they want to transition the state
1386 TransportLockHolder sLockHolder(&m_sStateLock);
1388 if (m_eState == SS_Closed)
1390 else if (m_eState == SS_Opening_NC)
1391 m_eState = SS_Opening;
1392 else if (m_eState == SS_Resync_NC)
1393 m_eState = SS_Resync;
1395 _ASSERTE(!"Bad session state");
1396 } // Leave m_sStateLock
1399 // Now we have a connection in place. Start reading messages and processing them. Which messages are
1400 // valid depends on whether we're in SS_Opening or SS_Resync (the state can change at any time
1401 // asynchronously to us to either SS_Closed or SS_Resync_NC but we're guaranteed the connection stays
1402 // valid (though not necessarily useful) until we notice this state change and Destroy() it ourself).
1403 // We check the state after each network operation.
1405 // During the SS_Opening and SS_Resync states we're guarantee to be the only thread posting sends, so
1406 // we can break the rules and use SendBlock without acquiring the state lock. (We use SendBlock a lot
1407 // during these phases because we're using simple Session* messages which don't require the extra
1408 // processing SendMessage gives us such as encryption or placement on the send queue).
1410 MessageHeader sSendHeader;
1411 MessageHeader sReceiveHeader;
1413 memset(&sSendHeader, 0, sizeof(MessageHeader));
1415 if (m_eState == SS_Opening)
1417 #ifdef RIGHT_SIDE_COMPILE
1418 // The right side actually starts things off by sending a SessionRequest message.
1420 SessionRequestData sDataBlock;
1422 sSendHeader.m_eType = MT_SessionRequest;
1423 sSendHeader.TypeSpecificData.VersionInfo.m_dwMajorVersion = kCurrentMajorVersion;
1424 sSendHeader.TypeSpecificData.VersionInfo.m_dwMinorVersion = kCurrentMinorVersion;
1426 // The start of the data block always contains a session ID. This is a GUID randomly generated at
1428 sSendHeader.m_cbDataBlock = sizeof(SessionRequestData);
1429 memcpy(&sDataBlock.m_sSessionID, &m_sSessionID, sizeof(m_sSessionID));
1431 // Send the header block followed by the data block. For failures during SS_Opening we just close
1432 // the connection and retry from the beginning (the failing send will already have caused a
1433 // transition into SS_Opening_NC. No need to use the same resend logic that SS_Resync does, since
1434 // no user messages have been sent and we can simply recreate the SessionRequest.
1435 DbgTransportLog(LC_Session, "Sending 'SessionRequest'");
1436 DBG_TRANSPORT_INC_STAT(SentSessionRequest);
1437 if (!SendBlock((PBYTE)&sSendHeader, sizeof(MessageHeader)) ||
1438 !SendBlock((PBYTE)&sDataBlock, sSendHeader.m_cbDataBlock))
1439 HANDLE_TRANSIENT_ERROR();
1441 // Wait for a reply.
1442 if (!ReceiveBlock((PBYTE)&sReceiveHeader, sizeof(MessageHeader)))
1443 HANDLE_TRANSIENT_ERROR();
1445 DbgTransportLogMessageReceived(&sReceiveHeader);
1447 // This should be either a SessionAccept or SessionReject. Any other message type will be treated
1448 // as a SessionReject (i.e. an unrecoverable failure that will leave the session in SS_Closed
1450 if (sReceiveHeader.m_eType != MT_SessionAccept)
1452 _ASSERTE(!"Unexpected response to SessionRequest");
1453 HANDLE_CRITICAL_ERROR();
1456 // Validate the SessionAccept.
1457 if (sReceiveHeader.TypeSpecificData.VersionInfo.m_dwMajorVersion != kCurrentMajorVersion ||
1458 sReceiveHeader.m_cbDataBlock != (DWORD)0)
1460 _ASSERTE(!"Malformed SessionAccept received");
1461 HANDLE_CRITICAL_ERROR();
1464 // The LS might have negotiated the minor protocol version down.
1465 m_dwMinorVersion = sReceiveHeader.TypeSpecificData.VersionInfo.m_dwMinorVersion;
1466 #else // RIGHT_SIDE_COMPILE
1468 // On the left side we wait for a SessionRequest first.
1469 if (!ReceiveBlock((PBYTE)&sReceiveHeader, sizeof(MessageHeader)))
1470 HANDLE_TRANSIENT_ERROR();
1472 DbgTransportLogMessageReceived(&sReceiveHeader);
1474 if (sReceiveHeader.m_eType != MT_SessionRequest)
1476 _ASSERTE(!"Unexpected message type");
1477 HANDLE_CRITICAL_ERROR();
1480 // Validate the SessionRequest.
1481 if (sReceiveHeader.TypeSpecificData.VersionInfo.m_dwMajorVersion != kCurrentMajorVersion ||
1482 sReceiveHeader.m_cbDataBlock != (DWORD)sizeof(SessionRequestData))
1484 // Send a SessionReject message with the reason for rejection.
1485 sSendHeader.m_eType = MT_SessionReject;
1486 sSendHeader.TypeSpecificData.SessionReject.m_eReason = RR_IncompatibleVersion;
1487 sSendHeader.TypeSpecificData.SessionReject.m_dwMajorVersion = kCurrentMajorVersion;
1488 sSendHeader.TypeSpecificData.SessionReject.m_dwMinorVersion = kCurrentMinorVersion;
1490 DbgTransportLog(LC_Session, "Sending 'SessionReject(RR_IncompatibleVersion)'");
1491 DBG_TRANSPORT_INC_STAT(SentSessionReject);
1493 SendBlock((PBYTE)&sSendHeader, sizeof(MessageHeader));
1495 // Go back into the opening state rather than closed because we want to give the RS a chance
1496 // to correct the problem and try again.
1497 HANDLE_TRANSIENT_ERROR();
1500 // Read the data block.
1501 SessionRequestData sDataBlock;
1502 if (!ReceiveBlock((PBYTE)&sDataBlock, sizeof(SessionRequestData)))
1503 HANDLE_TRANSIENT_ERROR();
1505 // If the RS only understands a lower minor protocol version than us then remember that fact.
1506 if (sReceiveHeader.TypeSpecificData.VersionInfo.m_dwMinorVersion < m_dwMinorVersion)
1507 m_dwMinorVersion = sReceiveHeader.TypeSpecificData.VersionInfo.m_dwMinorVersion;
1509 // Send a SessionAccept message back.
1510 sSendHeader.m_eType = MT_SessionAccept;
1511 sSendHeader.m_cbDataBlock = 0;
1512 sSendHeader.TypeSpecificData.VersionInfo.m_dwMajorVersion = kCurrentMajorVersion;
1513 sSendHeader.TypeSpecificData.VersionInfo.m_dwMinorVersion = m_dwMinorVersion;
1515 DbgTransportLog(LC_Session, "Sending 'SessionAccept'");
1516 DBG_TRANSPORT_INC_STAT(SentSessionAccept);
1518 if (!SendBlock((PBYTE)&sSendHeader, sizeof(MessageHeader)))
1519 HANDLE_TRANSIENT_ERROR();
1520 #endif // RIGHT_SIDE_COMPILE
1522 // Everything pans out, we have a session formed. But we must send messages that queued up
1523 // before transitioning the state to open (otherwise a racing send could sneak in ahead).
1525 // Must access the send queue under the state lock.
1527 TransportLockHolder sLockHolder(&m_sStateLock);
1528 Message *pMsg = m_pSendQueueFirst;
1531 if (SendBlock((PBYTE)&pMsg->m_sHeader, sizeof(MessageHeader)) && pMsg->m_pbDataBlock)
1532 SendBlock(pMsg->m_pbDataBlock, pMsg->m_cbDataBlock);
1533 pMsg = pMsg->m_pNext;
1536 // Check none of the sends failed.
1537 if (m_eState != SS_Opening)
1539 m_pipe.Disconnect();
1542 } // Leave m_sStateLock
1544 // Finally we can transition to SS_Open.
1546 TransportLockHolder sLockHolder(&m_sStateLock);
1547 if (m_eState == SS_Closed)
1549 else if (m_eState == SS_Opening)
1552 _ASSERTE(!"Bad session state");
1553 } // Leave m_sStateLock
1555 #ifdef RIGHT_SIDE_COMPILE
1556 // Signal any WaitForSessionToOpen() waiters that we've gotten to SS_Open.
1557 SetEvent(m_hSessionOpenEvent);
1558 #endif // RIGHT_SIDE_COMPILE
1560 // We're ready to begin receiving normal incoming messages now.
1564 // The SS_Resync case. Send a message indicating the last message we saw from the other side and
1565 // wait for a similar message to arrive for us.
1567 sSendHeader.m_eType = MT_SessionResync;
1568 sSendHeader.m_dwLastSeenId = m_dwLastMessageIdSeen;
1570 DbgTransportLog(LC_Session, "Sending 'SessionResync'");
1571 DBG_TRANSPORT_INC_STAT(SentSessionResync);
1573 if (!SendBlock((PBYTE)&sSendHeader, sizeof(MessageHeader)))
1574 HANDLE_TRANSIENT_ERROR();
1576 if (!ReceiveBlock((PBYTE)&sReceiveHeader, sizeof(MessageHeader)))
1577 HANDLE_TRANSIENT_ERROR();
1579 #ifndef RIGHT_SIDE_COMPILE
1580 if (sReceiveHeader.m_eType == MT_SessionRequest)
1582 DbgTransportLogMessageReceived(&sReceiveHeader);
1584 // This SessionRequest could be from a different debugger. In this case we should send a
1585 // SessionReject to let them know we're not available and close the connection so we can
1586 // re-listen for the original debugger.
1587 // Or it could be the original debugger re-sending the SessionRequest because the connection
1588 // died as we sent the SessionAccept.
1589 // We distinguish the two cases by looking at the session ID in the request.
1590 bool fRequestResend = false;
1592 // Only read the data block if it matches our expectations of its size.
1593 if (sReceiveHeader.m_cbDataBlock == (DWORD)sizeof(SessionRequestData))
1595 SessionRequestData sDataBlock;
1596 if (!ReceiveBlock((PBYTE)&sDataBlock, sizeof(SessionRequestData)))
1597 HANDLE_TRANSIENT_ERROR();
1599 // Check the session ID for a match.
1600 if (memcmp(&sDataBlock.m_sSessionID, &m_sSessionID, sizeof(m_sSessionID)) == 0)
1601 // OK, everything checks out and this is a valid re-send of a SessionRequest.
1602 fRequestResend = true;
1607 // The RS never got our SessionAccept. We must resend it.
1608 memset(&sSendHeader, 0, sizeof(MessageHeader));
1609 sSendHeader.m_eType = MT_SessionAccept;
1610 sSendHeader.m_cbDataBlock = 0;
1611 sSendHeader.TypeSpecificData.VersionInfo.m_dwMajorVersion = kCurrentMajorVersion;
1612 sSendHeader.TypeSpecificData.VersionInfo.m_dwMinorVersion = m_dwMinorVersion;
1614 DbgTransportLog(LC_Session, "Sending 'SessionAccept'");
1615 DBG_TRANSPORT_INC_STAT(SentSessionAccept);
1617 if (!SendBlock((PBYTE)&sSendHeader, sizeof(MessageHeader)))
1618 HANDLE_TRANSIENT_ERROR();
1620 // Now simply reset the connection. The RS should get the SessionAccept and transition to
1621 // SS_Open then detect the connection loss and transition to SS_Resync_NC, which will
1622 // finally sync the two sides.
1623 HANDLE_TRANSIENT_ERROR();
1627 // This is the case where we must reject the request.
1628 memset(&sSendHeader, 0, sizeof(MessageHeader));
1629 sSendHeader.m_eType = MT_SessionReject;
1630 sSendHeader.TypeSpecificData.SessionReject.m_eReason = RR_AlreadyAttached;
1631 sSendHeader.TypeSpecificData.SessionReject.m_dwMajorVersion = kCurrentMajorVersion;
1632 sSendHeader.TypeSpecificData.SessionReject.m_dwMinorVersion = kCurrentMinorVersion;
1634 DbgTransportLog(LC_Session, "Sending 'SessionReject(RR_AlreadyAttached)'");
1635 DBG_TRANSPORT_INC_STAT(SentSessionReject);
1637 SendBlock((PBYTE)&sSendHeader, sizeof(MessageHeader));
1639 HANDLE_TRANSIENT_ERROR();
1642 #endif // !RIGHT_SIDE_COMPILE
1644 DbgTransportLogMessageReceived(&sReceiveHeader);
1646 // Handle all other invalid message types by shutting down (it may be an attempt to subvert the
1648 if (sReceiveHeader.m_eType != MT_SessionResync)
1650 _ASSERTE(!"Unexpected message type during SS_Resync");
1651 HANDLE_CRITICAL_ERROR();
1654 // We've got our resync message. Go through the send queue and resend any messages that haven't
1655 // been processed by the other side. Those that have been processed can be discarded (unless
1656 // they're waiting for another form of higher level acknowledgement, such as a reply message).
1658 // Discard unneeded messages first.
1659 FlushSendQueue(sReceiveHeader.m_dwLastSeenId);
1661 // Must access the send queue under the state lock.
1663 TransportLockHolder sLockHolder(&m_sStateLock);
1665 Message *pMsg = m_pSendQueueFirst;
1668 if (pMsg->m_sHeader.m_dwId > sReceiveHeader.m_dwLastSeenId)
1670 // The other side never saw this message, re-send it.
1671 DBG_TRANSPORT_INC_STAT(Resends);
1672 if (SendBlock((PBYTE)&pMsg->m_sHeader, sizeof(MessageHeader)) && pMsg->m_pbDataBlock)
1673 SendBlock(pMsg->m_pbDataBlock, pMsg->m_cbDataBlock);
1675 pMsg = pMsg->m_pNext;
1678 // Finished processing queued sends. We can transition to the SS_Open state now as long as there
1679 // wasn't a send failure or an asynchronous Shutdown().
1680 if (m_eState == SS_Resync)
1682 else if (m_eState == SS_Closed)
1684 else if (m_eState == SS_Resync_NC)
1686 m_pipe.Disconnect();
1690 _ASSERTE(!"Bad session state");
1691 } // Leave m_sStateLock
1694 // Once we get here we should be in SS_Open (can't assert this because Shutdown() can throw the state
1695 // into SS_Closed and we've just released SendMessage() calls on other threads that can transition us
1698 // We now loop receiving messages and processing them until the state changes.
1699 while (m_eState == SS_Open)
1701 // temporary data block used in DCB messages
1702 DebuggerIPCControlBlockTransport dcbt;
1704 // temporary virtual stack unwind context buffer
1705 CONTEXT frameContext;
1707 // Read a message header block.
1708 if (!ReceiveBlock((PBYTE)&sReceiveHeader, sizeof(MessageHeader)))
1709 HANDLE_TRANSIENT_ERROR();
1711 // Since we care about security here, perform some additional validation checks that make it
1712 // harder for a malicious sender to attack with random message data.
1713 if (sReceiveHeader.m_eType > MT_GetAppDomainCB ||
1714 (sReceiveHeader.m_dwId <= m_dwLastMessageIdSeen &&
1715 sReceiveHeader.m_dwId != (DWORD)0) ||
1716 (sReceiveHeader.m_dwReplyId >= m_dwNextMessageId &&
1717 sReceiveHeader.m_dwReplyId != (DWORD)0) ||
1718 (sReceiveHeader.m_dwLastSeenId >= m_dwNextMessageId &&
1719 sReceiveHeader.m_dwLastSeenId != (DWORD)0))
1721 _ASSERTE(!"Incoming message header looks bogus");
1722 HANDLE_CRITICAL_ERROR();
1725 DbgTransportLogMessageReceived(&sReceiveHeader);
1727 // Flush any entries in our send queue for messages that the other side has just confirmed
1728 // processed with this message.
1729 FlushSendQueue(sReceiveHeader.m_dwLastSeenId);
1731 #ifndef RIGHT_SIDE_COMPILE
1732 // State variables to track whether this message needs a reply and if so whether it consists of a
1733 // header only or a header and an optional data block.
1734 bool fReplyRequired = false;
1735 PBYTE pbOptReplyData = NULL;
1736 DWORD cbOptReplyData = 0;
1737 HRESULT hr = E_FAIL;
1739 // if you change the lifetime of resultBuffer, make sure you change pbOptReplyData to match.
1740 // In some cases pbOptReplyData will point at the memory held alive in resultBuffer
1741 WriteBuffer resultBuffer;
1742 ReadBuffer receiveBuffer;
1744 #endif // RIGHT_SIDE_COMPILE
1746 // Dispatch based on message type.
1748 // **** IMPORTANT NOTE ****
1750 // We must be very careful wrt to updating m_dwLastMessageIdSeen here. If we update it too soon
1751 // (we haven't finished receiving the entire message, for instance) then the other side won't
1752 // re-send the message on failure and we'll lose it. If we update it too late we might have
1753 // reported the message to our caller or produced any other side-effect we can't take back such as
1754 // sending a reply and then hit an error and reset the connection before we had a chance to record
1755 // the message as seen. In this case the other side will re-send the original message and we'll
1756 // repeat our actions, which is also very bad.
1758 // So we must be very disciplined here.
1760 // First we must read the message in its entirety (i.e. receive the data block if there is one)
1761 // without causing any side-effects. This ensures that any failure at this point will be handled
1762 // correctly (by the other side re-sending us the same message).
1764 // Then we process the message. At this point we are committed. The processing must always
1765 // succeed, or have no side-effect (that we care about) or we must have an additional scheme to
1766 // handle resynchronization in the event of failure. This ensures that we don't have the tricky
1767 // situation where we can't cope with a re-send of the message (because we've started processing
1768 // it) but can't report a failure to the other side (because we don't know how).
1770 // Finally we must ensure that there is no error path between the completion of processing and
1771 // updating the m_dwLastMessageIdSeen field. This ensures we don't accidently get re-sent a
1772 // message we've processed completely (it's really just a sub-case of the rule above, but it's
1773 // worth pointing out explicitly since it can be a subtle problem).
1775 // Request messages (such as MT_GetDCB) are an interesting case in point here. They all require a
1776 // reply and we can fail on the reply because we run out of system resources. This breaks the
1777 // second rule above (we fail halfway through processing). We should really preallocate enough
1778 // resources to send the reply before we begin processing of it but for now we don't since (a) the
1779 // SendMessage system isn't currently set up to make this easy and (b) we happen to know that all
1780 // the request types are effectively idempotent (even ReadMemory and WriteMemory since the RS is
1781 // holding the LS still while it does these). So instead we must carefully distinguish the case
1782 // where SendMessage fails without possibility of message transmission (e.g. out of memory) and
1783 // those where it fails for a transient network failure (where it will re-send the reply on
1784 // resync). This is easy enough to do since SendMessage returns a failure hresult for the first
1785 // case and success (and a state transition) for the second. In the first case we don't update
1786 // m_dwLastMessageIdSeen and instead wait for the request to be resent. In the second we make the
1787 // update because we know the reply will get through eventually.
1789 // **** IMPORTANT NOTE ****
1790 switch (sReceiveHeader.m_eType)
1792 case MT_SessionRequest:
1793 case MT_SessionAccept:
1794 case MT_SessionReject:
1795 case MT_SessionResync:
1796 // Illegal messages at this time, fail the transport entirely.
1797 m_eState = SS_Closed;
1800 case MT_SessionClose:
1801 // Close is legal on the LS and transitions to the SS_Opening_NC state. It's illegal on the RS
1802 // and should shutdown the transport.
1803 #ifdef RIGHT_SIDE_COMPILE
1804 m_eState = SS_Closed;
1806 #else // RIGHT_SIDE_COMPILE
1807 // We need to do some state cleanup here, since when we reform a connection (if ever, it will
1808 // be with a new session).
1810 TransportLockHolder sLockHolder(&m_sStateLock);
1812 // Check we're still in a good state before a clean restart.
1813 if (m_eState != SS_Open)
1815 m_eState = SS_Closed;
1819 m_pipe.Disconnect();
1821 // We could add code to drain the send queue here (like we have for SS_Closed at the end of
1822 // this method) but I'm pretty sure we can only get a graceful session close with no
1823 // outstanding sends. So just assert the queue is empty instead. If the assert fires and it's
1824 // not due to an issue we can add the logic here).
1825 _ASSERTE(m_pSendQueueFirst == NULL);
1826 _ASSERTE(m_pSendQueueLast == NULL);
1828 // This will reset all session specific state and transition us to SS_Opening_NC.
1830 } // Leave m_sStateLock
1832 goto ResetConnection;
1833 #endif // RIGHT_SIDE_COMPILE
1837 // Incoming debugger event.
1839 if (sReceiveHeader.m_cbDataBlock > CorDBIPC_BUFFER_SIZE)
1841 _ASSERTE(!"Oversized Event");
1842 HANDLE_CRITICAL_ERROR();
1845 // See if our array of buffered events has filled up. If so we'll need to re-allocate the
1846 // array to expand it.
1847 if (m_cValidEventBuffers == m_cEventBuffers)
1849 // Allocate a larger array.
1850 DWORD cNewEntries = m_cEventBuffers + 4;
1851 DbgEventBufferEntry * pNewBuffers = (DbgEventBufferEntry *)new (nothrow) BYTE[cNewEntries * sizeof(DbgEventBufferEntry)];
1852 if (pNewBuffers == NULL)
1853 HANDLE_TRANSIENT_ERROR();
1855 // We must take the lock to swap the new array in. Although this thread is the only one
1856 // that can expand the array, a client thread may be in GetNextEvent() reading from the
1859 TransportLockHolder sLockHolder(&m_sStateLock);
1861 // When we copy old array contents over we place the head of the list at the start of
1862 // the new array for simplicity. If the head happened to be at the start of the old
1863 // array anyway, this is even simpler.
1864 if (m_idxEventBufferHead == 0)
1865 memcpy(pNewBuffers, m_pEventBuffers, m_cEventBuffers * sizeof(DbgEventBufferEntry));
1868 // Otherwise we need to perform the copy in two segments: first we copy the head
1869 // of the list (starts at a non-zero index and runs to the end of the old array)
1870 // into the start of the new array.
1871 DWORD cHeadEntries = m_cEventBuffers - m_idxEventBufferHead;
1874 &m_pEventBuffers[m_idxEventBufferHead],
1875 cHeadEntries * sizeof(DbgEventBufferEntry));
1877 // Then we copy the remaining portion from the beginning of the old array upto to
1878 // the index of the head.
1879 memcpy(&pNewBuffers[cHeadEntries],
1881 m_idxEventBufferHead * sizeof(DbgEventBufferEntry));
1884 // Delete the old array.
1885 delete [] m_pEventBuffers;
1887 // Swap the new array in.
1888 m_pEventBuffers = pNewBuffers;
1889 m_cEventBuffers = cNewEntries;
1891 // The new array now has the head at index zero and the tail at the start of the
1893 m_idxEventBufferHead = 0;
1894 m_idxEventBufferTail = m_cValidEventBuffers;
1898 // We have at least one free buffer at this point (no threading issues, the only thread that
1899 // can add entries is this one).
1901 // Receive event data into the tail buffer (we want to do this without holding the state lock
1902 // and can do so safely since this is the only thread that can receive data and clients can do
1903 // nothing that impacts the location of the tail of the buffer list).
1904 if (!ReceiveBlock((PBYTE)&m_pEventBuffers[m_idxEventBufferTail].m_event, sReceiveHeader.m_cbDataBlock))
1905 HANDLE_TRANSIENT_ERROR();
1908 m_pEventBuffers[m_idxEventBufferTail].m_type = sReceiveHeader.TypeSpecificData.Event.m_eIPCEventType;
1910 // We must take the lock to update the count of valid entries though, since clients can
1911 // touch this field as well.
1912 TransportLockHolder sLockHolder(&m_sStateLock);
1914 m_cValidEventBuffers++;
1915 DWORD idxCurrentEvent = m_idxEventBufferTail;
1917 // Update tail of the list (strictly speaking this needn't be done under the lock, but the
1918 // code in GetNextEvent() does read it for an assert.
1919 m_idxEventBufferTail = (m_idxEventBufferTail + 1) % m_cEventBuffers;
1921 // If we just added the first valid event then wake up the client so they can call
1923 if (m_cValidEventBuffers == 1)
1924 SetEvent(m_rghEventReadyEvent[m_pEventBuffers[idxCurrentEvent].m_type]);
1930 #ifdef RIGHT_SIDE_COMPILE
1931 if (!ProcessReply(&sReceiveHeader))
1932 HANDLE_TRANSIENT_ERROR();
1933 #else // RIGHT_SIDE_COMPILE
1934 // The RS wants to read our memory. First check the range requested is both committed and
1935 // readable. If that succeeds we simply set the optional reply block to match the request region
1936 // (i.e. we send the memory directly).
1937 fReplyRequired = true;
1939 hr = CheckBufferAccess(sReceiveHeader.TypeSpecificData.MemoryAccess.m_pbLeftSideBuffer,
1940 sReceiveHeader.TypeSpecificData.MemoryAccess.m_cbLeftSideBuffer,
1942 sReceiveHeader.TypeSpecificData.MemoryAccess.m_hrResult = hr;
1945 pbOptReplyData = sReceiveHeader.TypeSpecificData.MemoryAccess.m_pbLeftSideBuffer;
1946 cbOptReplyData = sReceiveHeader.TypeSpecificData.MemoryAccess.m_cbLeftSideBuffer;
1948 #endif // RIGHT_SIDE_COMPILE
1951 case MT_WriteMemory:
1952 #ifdef RIGHT_SIDE_COMPILE
1953 if (!ProcessReply(&sReceiveHeader))
1954 HANDLE_TRANSIENT_ERROR();
1955 #else // RIGHT_SIDE_COMPILE
1956 // The RS wants to write our memory.
1957 if (sReceiveHeader.m_cbDataBlock != sReceiveHeader.TypeSpecificData.MemoryAccess.m_cbLeftSideBuffer)
1959 _ASSERTE(!"Inconsistent WriteMemory request");
1960 HANDLE_CRITICAL_ERROR();
1963 fReplyRequired = true;
1965 // Check the range requested is both committed and writeable. If that succeeds we simply read
1966 // the next incoming block into the destination buffer.
1967 hr = CheckBufferAccess(sReceiveHeader.TypeSpecificData.MemoryAccess.m_pbLeftSideBuffer,
1968 sReceiveHeader.TypeSpecificData.MemoryAccess.m_cbLeftSideBuffer,
1972 if (!ReceiveBlock(sReceiveHeader.TypeSpecificData.MemoryAccess.m_pbLeftSideBuffer,
1973 sReceiveHeader.TypeSpecificData.MemoryAccess.m_cbLeftSideBuffer))
1974 HANDLE_TRANSIENT_ERROR();
1978 sReceiveHeader.TypeSpecificData.MemoryAccess.m_hrResult = hr;
1980 // We might be failing the write attempt but we still need to read the update data to
1981 // drain it from the connection or we'll become unsynchronized (i.e. we'll treat the start
1982 // of the write data as the next message header). So read and discard the data into a
1985 DWORD cbBytesToRead = sReceiveHeader.TypeSpecificData.MemoryAccess.m_cbLeftSideBuffer;
1986 while (cbBytesToRead)
1988 DWORD cbTransfer = min(cbBytesToRead, sizeof(rgDummy));
1989 if (!ReceiveBlock(rgDummy, cbTransfer))
1990 HANDLE_TRANSIENT_ERROR();
1991 cbBytesToRead -= cbTransfer;
1994 #endif // RIGHT_SIDE_COMPILE
1997 case MT_VirtualUnwind:
1998 #ifdef RIGHT_SIDE_COMPILE
1999 if (!ProcessReply(&sReceiveHeader))
2000 HANDLE_TRANSIENT_ERROR();
2001 #else // RIGHT_SIDE_COMPILE
2002 if (sReceiveHeader.m_cbDataBlock != (DWORD)sizeof(frameContext))
2004 _ASSERTE(!"Inconsistent VirtualUnwind request");
2005 HANDLE_CRITICAL_ERROR();
2008 if (!ReceiveBlock((PBYTE)&frameContext, sizeof(frameContext)))
2010 HANDLE_TRANSIENT_ERROR();
2013 if (!PAL_VirtualUnwind(&frameContext, NULL))
2015 HANDLE_TRANSIENT_ERROR();
2018 fReplyRequired = true;
2019 pbOptReplyData = (PBYTE)&frameContext;
2020 cbOptReplyData = sizeof(frameContext);
2021 #endif // RIGHT_SIDE_COMPILE
2025 #ifdef RIGHT_SIDE_COMPILE
2026 if (!ProcessReply(&sReceiveHeader))
2027 HANDLE_TRANSIENT_ERROR();
2028 #else // RIGHT_SIDE_COMPILE
2029 fReplyRequired = true;
2030 MarshalDCBToDCBTransport(m_pDCB, &dcbt);
2031 pbOptReplyData = (PBYTE)&dcbt;
2032 cbOptReplyData = sizeof(DebuggerIPCControlBlockTransport);
2033 #endif // RIGHT_SIDE_COMPILE
2037 #ifdef RIGHT_SIDE_COMPILE
2038 if (!ProcessReply(&sReceiveHeader))
2039 HANDLE_TRANSIENT_ERROR();
2040 #else // RIGHT_SIDE_COMPILE
2041 if (sReceiveHeader.m_cbDataBlock != (DWORD)sizeof(DebuggerIPCControlBlockTransport))
2043 _ASSERTE(!"Inconsistent SetDCB request");
2044 HANDLE_CRITICAL_ERROR();
2047 fReplyRequired = true;
2049 if (!ReceiveBlock((PBYTE)&dcbt, sizeof(DebuggerIPCControlBlockTransport)))
2050 HANDLE_TRANSIENT_ERROR();
2052 MarshalDCBTransportToDCB(&dcbt, m_pDCB);
2053 #endif // RIGHT_SIDE_COMPILE
2056 case MT_GetAppDomainCB:
2057 #ifdef RIGHT_SIDE_COMPILE
2058 if (!ProcessReply(&sReceiveHeader))
2059 HANDLE_TRANSIENT_ERROR();
2060 #else // RIGHT_SIDE_COMPILE
2061 fReplyRequired = true;
2062 pbOptReplyData = (PBYTE)m_pADB;
2063 cbOptReplyData = sizeof(AppDomainEnumerationIPCBlock);
2064 #endif // RIGHT_SIDE_COMPILE
2068 _ASSERTE(!"Unknown message type");
2069 HANDLE_CRITICAL_ERROR();
2072 #ifndef RIGHT_SIDE_COMPILE
2073 // On the left side we may need to send a reply back.
2077 sReply.Init(sReceiveHeader.m_eType, pbOptReplyData, cbOptReplyData);
2078 sReply.m_sHeader.m_dwReplyId = sReceiveHeader.m_dwId;
2079 sReply.m_sHeader.TypeSpecificData = sReceiveHeader.TypeSpecificData;
2082 DbgTransportLog(LC_Requests, "Sending '%s' reply", MessageName(sReceiveHeader.m_eType));
2085 // We must be careful with the failure mode of SendMessage here to avoid the same request
2086 // being processed too many or too few times. See the comment above starting with 'IMPORTANT
2087 // NOTE' for more details. The upshot is that on SendMessage hresult failures (which indicate
2088 // the message will never be sent), we don't update m_dwLastMessageIdSeen and simply wait for
2089 // the request to be made again. When we get success, however, we must be careful to ensure
2090 // that m_dwLastMessageIdSeen gets updated even if a network error is reported. Otherwise on
2091 // the resync we'll both reprocess the request and re-send the original reply which is very
2093 hr = SendMessage(&sReply, false);
2096 HANDLE_TRANSIENT_ERROR(); // Message will never be sent, other side will retry
2098 // SendMessage doesn't report network errors (it simply queues the send and changes the
2099 // session state). So check for a network error here specifically so we can get started on the
2100 // resync. We must update m_dwLastMessageIdSeen first though, or the other side will retry the
2102 if (m_eState != SS_Open)
2104 _ASSERTE(sReceiveHeader.m_dwId > m_dwLastMessageIdSeen);
2105 m_dwLastMessageIdSeen = sReceiveHeader.m_dwId;
2106 HANDLE_TRANSIENT_ERROR();
2109 #endif // !RIGHT_SIDE_COMPILE
2111 if (sReceiveHeader.m_dwId != (DWORD)0)
2113 // We've now completed processing on the incoming message. Remember we've processed up to this
2114 // message ID so that on a resync the other side doesn't send it to us again.
2115 _ASSERTE(sReceiveHeader.m_dwId > m_dwLastMessageIdSeen);
2116 m_dwLastMessageIdSeen = sReceiveHeader.m_dwId;
2123 _ASSERTE(m_eState == SS_Closed);
2125 #ifdef RIGHT_SIDE_COMPILE
2126 // The session is definitely not open at this point.
2127 ResetEvent(m_hSessionOpenEvent);
2128 #endif // RIGHT_SIDE_COMPILE
2130 // Close the connection if we haven't done so already.
2131 m_pipe.Disconnect();
2133 // Drain any remaining entries in the send queue (aborting them when they need completions).
2135 TransportLockHolder sLockHolder(&m_sStateLock);
2138 while ((pMsg = m_pSendQueueFirst) != NULL)
2140 // Remove message from the queue.
2141 m_pSendQueueFirst = pMsg->m_pNext;
2143 // Determine whether the message needs to be deleted by us before we signal any completion (because
2144 // once we signal the completion pMsg might become invalid immediately if it's not a copy).
2145 bool fMustDelete = pMsg->m_pOrigMessage != pMsg;
2147 // If there's a waiter (i.e. we don't own the message) it know that the operation didn't really
2148 // complete, it was aborted.
2150 pMsg->m_pOrigMessage->m_fAborted = true;
2152 // Determine how to complete the message.
2153 switch (pMsg->m_sHeader.m_eType)
2155 case MT_SessionRequest:
2156 case MT_SessionAccept:
2157 case MT_SessionReject:
2158 case MT_SessionResync:
2159 case MT_SessionClose:
2160 _ASSERTE(!"Session management messages should not be on send queue");
2166 #ifdef RIGHT_SIDE_COMPILE
2168 case MT_WriteMemory:
2169 case MT_VirtualUnwind:
2172 case MT_GetAppDomainCB:
2173 // On the RS these are the original requests. Signal the completion event.
2174 SignalReplyEvent(pMsg);
2176 #else // RIGHT_SIDE_COMPILE
2178 case MT_WriteMemory:
2179 case MT_VirtualUnwind:
2182 case MT_GetAppDomainCB:
2183 // On the LS these are replies to the original request. Nobody's waiting on these.
2185 #endif // RIGHT_SIDE_COMPILE
2188 _ASSERTE(!"Unknown message type");
2191 // If the message was a copy, deallocate the resources now.
2194 if (pMsg->m_pbDataBlock)
2195 delete [] pMsg->m_pbDataBlock;
2199 } // Leave m_sStateLock
2201 // Now release all the resources allocated for the transport now that the
2202 // worker thread isn't using them anymore.
2206 // Given a fully initialized debugger event structure, return the size of the structure in bytes (this is not
2207 // trivial since DebuggerIPCEvent contains a large union member which can cause the portion containing
2208 // significant data to vary wildy from event to event).
2209 DWORD DbgTransportSession::GetEventSize(DebuggerIPCEvent *pEvent)
2211 DWORD cbBaseSize = offsetof(DebuggerIPCEvent, LeftSideStartupData);
2212 DWORD cbAdditionalSize = 0;
2214 switch (pEvent->type & DB_IPCE_TYPE_MASK)
2216 case DB_IPCE_SYNC_COMPLETE:
2217 case DB_IPCE_THREAD_ATTACH:
2218 case DB_IPCE_THREAD_DETACH:
2219 case DB_IPCE_USER_BREAKPOINT:
2220 case DB_IPCE_EXIT_APP_DOMAIN:
2221 case DB_IPCE_SET_DEBUG_STATE_RESULT:
2222 case DB_IPCE_FUNC_EVAL_ABORT_RESULT:
2223 case DB_IPCE_CONTROL_C_EVENT:
2224 case DB_IPCE_FUNC_EVAL_CLEANUP_RESULT:
2225 case DB_IPCE_SET_METHOD_JMC_STATUS_RESULT:
2226 case DB_IPCE_SET_MODULE_JMC_STATUS_RESULT:
2227 case DB_IPCE_FUNC_EVAL_RUDE_ABORT_RESULT:
2228 case DB_IPCE_INTERCEPT_EXCEPTION_RESULT:
2229 case DB_IPCE_INTERCEPT_EXCEPTION_COMPLETE:
2230 case DB_IPCE_CREATE_PROCESS:
2231 case DB_IPCE_SET_NGEN_COMPILER_FLAGS_RESULT:
2232 case DB_IPCE_LEFTSIDE_STARTUP:
2233 case DB_IPCE_ASYNC_BREAK:
2234 case DB_IPCE_CONTINUE:
2235 case DB_IPCE_ATTACHING:
2236 case DB_IPCE_GET_NGEN_COMPILER_FLAGS:
2237 case DB_IPCE_DETACH_FROM_PROCESS:
2238 case DB_IPCE_CONTROL_C_EVENT_RESULT:
2239 cbAdditionalSize = 0;
2242 case DB_IPCE_BREAKPOINT:
2243 cbAdditionalSize = sizeof(pEvent->BreakpointData);
2246 case DB_IPCE_LOAD_MODULE:
2247 cbAdditionalSize = sizeof(pEvent->LoadModuleData);
2250 case DB_IPCE_UNLOAD_MODULE:
2251 cbAdditionalSize = sizeof(pEvent->UnloadModuleData);
2254 case DB_IPCE_LOAD_CLASS:
2255 cbAdditionalSize = sizeof(pEvent->LoadClass);
2258 case DB_IPCE_UNLOAD_CLASS:
2259 cbAdditionalSize = sizeof(pEvent->UnloadClass);
2262 case DB_IPCE_EXCEPTION:
2263 cbAdditionalSize = sizeof(pEvent->Exception);
2266 case DB_IPCE_BREAKPOINT_ADD_RESULT:
2267 cbAdditionalSize = sizeof(pEvent->BreakpointData);
2270 case DB_IPCE_STEP_RESULT:
2271 cbAdditionalSize = sizeof(pEvent->StepData);
2272 if (pEvent->StepData.rangeCount)
2273 cbAdditionalSize += (pEvent->StepData.rangeCount - 1) * sizeof(COR_DEBUG_STEP_RANGE);
2276 case DB_IPCE_STEP_COMPLETE:
2277 cbAdditionalSize = sizeof(pEvent->StepData);
2280 case DB_IPCE_GET_BUFFER_RESULT:
2281 cbAdditionalSize = sizeof(pEvent->GetBufferResult);
2284 case DB_IPCE_RELEASE_BUFFER_RESULT:
2285 cbAdditionalSize = sizeof(pEvent->ReleaseBufferResult);
2288 case DB_IPCE_ENC_ADD_FIELD:
2289 cbAdditionalSize = sizeof(pEvent->EnCUpdate);
2292 case DB_IPCE_APPLY_CHANGES_RESULT:
2293 cbAdditionalSize = sizeof(pEvent->ApplyChangesResult);
2296 case DB_IPCE_FIRST_LOG_MESSAGE:
2297 cbAdditionalSize = sizeof(pEvent->FirstLogMessage);
2300 case DB_IPCE_LOGSWITCH_SET_MESSAGE:
2301 cbAdditionalSize = sizeof(pEvent->LogSwitchSettingMessage);
2304 case DB_IPCE_CREATE_APP_DOMAIN:
2305 cbAdditionalSize = sizeof(pEvent->AppDomainData);
2308 case DB_IPCE_LOAD_ASSEMBLY:
2309 cbAdditionalSize = sizeof(pEvent->AssemblyData);
2312 case DB_IPCE_UNLOAD_ASSEMBLY:
2313 cbAdditionalSize = sizeof(pEvent->AssemblyData);
2316 case DB_IPCE_FUNC_EVAL_SETUP_RESULT:
2317 cbAdditionalSize = sizeof(pEvent->FuncEvalSetupComplete);
2320 case DB_IPCE_FUNC_EVAL_COMPLETE:
2321 cbAdditionalSize = sizeof(pEvent->FuncEvalComplete);
2324 case DB_IPCE_SET_REFERENCE_RESULT:
2325 cbAdditionalSize = sizeof(pEvent->SetReference);
2328 case DB_IPCE_NAME_CHANGE:
2329 cbAdditionalSize = sizeof(pEvent->NameChange);
2332 case DB_IPCE_UPDATE_MODULE_SYMS:
2333 cbAdditionalSize = sizeof(pEvent->UpdateModuleSymsData);
2336 case DB_IPCE_ENC_REMAP:
2337 cbAdditionalSize = sizeof(pEvent->EnCRemap);
2340 case DB_IPCE_SET_VALUE_CLASS_RESULT:
2341 cbAdditionalSize = sizeof(pEvent->SetValueClass);
2344 case DB_IPCE_BREAKPOINT_SET_ERROR:
2345 cbAdditionalSize = sizeof(pEvent->BreakpointSetErrorData);
2348 case DB_IPCE_ENC_UPDATE_FUNCTION:
2349 cbAdditionalSize = sizeof(pEvent->EnCUpdate);
2352 case DB_IPCE_GET_METHOD_JMC_STATUS_RESULT:
2353 cbAdditionalSize = sizeof(pEvent->SetJMCFunctionStatus);
2356 case DB_IPCE_GET_THREAD_FOR_TASKID_RESULT:
2357 cbAdditionalSize = sizeof(pEvent->GetThreadForTaskIdResult);
2360 case DB_IPCE_CREATE_CONNECTION:
2361 cbAdditionalSize = sizeof(pEvent->CreateConnection);
2364 case DB_IPCE_DESTROY_CONNECTION:
2365 cbAdditionalSize = sizeof(pEvent->ConnectionChange);
2368 case DB_IPCE_CHANGE_CONNECTION:
2369 cbAdditionalSize = sizeof(pEvent->ConnectionChange);
2372 case DB_IPCE_EXCEPTION_CALLBACK2:
2373 cbAdditionalSize = sizeof(pEvent->ExceptionCallback2);
2376 case DB_IPCE_EXCEPTION_UNWIND:
2377 cbAdditionalSize = sizeof(pEvent->ExceptionUnwind);
2380 case DB_IPCE_CREATE_HANDLE_RESULT:
2381 cbAdditionalSize = sizeof(pEvent->CreateHandleResult);
2384 case DB_IPCE_ENC_REMAP_COMPLETE:
2385 cbAdditionalSize = sizeof(pEvent->EnCRemapComplete);
2388 case DB_IPCE_ENC_ADD_FUNCTION:
2389 cbAdditionalSize = sizeof(pEvent->EnCUpdate);
2392 case DB_IPCE_GET_NGEN_COMPILER_FLAGS_RESULT:
2393 cbAdditionalSize = sizeof(pEvent->JitDebugInfo);
2396 case DB_IPCE_MDA_NOTIFICATION:
2397 cbAdditionalSize = sizeof(pEvent->MDANotification);
2400 case DB_IPCE_GET_GCHANDLE_INFO_RESULT:
2401 cbAdditionalSize = sizeof(pEvent->GetGCHandleInfoResult);
2404 case DB_IPCE_SET_IP:
2405 cbAdditionalSize = sizeof(pEvent->SetIP);
2408 case DB_IPCE_BREAKPOINT_ADD:
2409 cbAdditionalSize = sizeof(pEvent->BreakpointData);
2412 case DB_IPCE_BREAKPOINT_REMOVE:
2413 cbAdditionalSize = sizeof(pEvent->BreakpointData);
2416 case DB_IPCE_STEP_CANCEL:
2417 cbAdditionalSize = sizeof(pEvent->StepData);
2421 cbAdditionalSize = sizeof(pEvent->StepData);
2422 if (pEvent->StepData.rangeCount)
2423 cbAdditionalSize += (pEvent->StepData.rangeCount - 1) * sizeof(COR_DEBUG_STEP_RANGE);
2426 case DB_IPCE_STEP_OUT:
2427 cbAdditionalSize = sizeof(pEvent->StepData);
2430 case DB_IPCE_GET_BUFFER:
2431 cbAdditionalSize = sizeof(pEvent->GetBuffer);
2434 case DB_IPCE_RELEASE_BUFFER:
2435 cbAdditionalSize = sizeof(pEvent->ReleaseBuffer);
2438 case DB_IPCE_SET_CLASS_LOAD_FLAG:
2439 cbAdditionalSize = sizeof(pEvent->SetClassLoad);
2442 case DB_IPCE_APPLY_CHANGES:
2443 cbAdditionalSize = sizeof(pEvent->ApplyChanges);
2446 case DB_IPCE_SET_NGEN_COMPILER_FLAGS:
2447 cbAdditionalSize = sizeof(pEvent->JitDebugInfo);
2450 case DB_IPCE_IS_TRANSITION_STUB:
2451 cbAdditionalSize = sizeof(pEvent->IsTransitionStub);
2454 case DB_IPCE_IS_TRANSITION_STUB_RESULT:
2455 cbAdditionalSize = sizeof(pEvent->IsTransitionStubResult);
2458 case DB_IPCE_MODIFY_LOGSWITCH:
2459 cbAdditionalSize = sizeof(pEvent->LogSwitchSettingMessage);
2462 case DB_IPCE_ENABLE_LOG_MESSAGES:
2463 cbAdditionalSize = sizeof(pEvent->LogSwitchSettingMessage);
2466 case DB_IPCE_FUNC_EVAL:
2467 cbAdditionalSize = sizeof(pEvent->FuncEval);
2470 case DB_IPCE_SET_REFERENCE:
2471 cbAdditionalSize = sizeof(pEvent->SetReference);
2474 case DB_IPCE_FUNC_EVAL_ABORT:
2475 cbAdditionalSize = sizeof(pEvent->FuncEvalAbort);
2478 case DB_IPCE_FUNC_EVAL_CLEANUP:
2479 cbAdditionalSize = sizeof(pEvent->FuncEvalCleanup);
2482 case DB_IPCE_SET_ALL_DEBUG_STATE:
2483 cbAdditionalSize = sizeof(pEvent->SetAllDebugState);
2486 case DB_IPCE_SET_VALUE_CLASS:
2487 cbAdditionalSize = sizeof(pEvent->SetValueClass);
2490 case DB_IPCE_SET_METHOD_JMC_STATUS:
2491 cbAdditionalSize = sizeof(pEvent->SetJMCFunctionStatus);
2494 case DB_IPCE_GET_METHOD_JMC_STATUS:
2495 cbAdditionalSize = sizeof(pEvent->SetJMCFunctionStatus);
2498 case DB_IPCE_SET_MODULE_JMC_STATUS:
2499 cbAdditionalSize = sizeof(pEvent->SetJMCFunctionStatus);
2502 case DB_IPCE_GET_THREAD_FOR_TASKID:
2503 cbAdditionalSize = sizeof(pEvent->GetThreadForTaskId);
2506 case DB_IPCE_FUNC_EVAL_RUDE_ABORT:
2507 cbAdditionalSize = sizeof(pEvent->FuncEvalRudeAbort);
2510 case DB_IPCE_CREATE_HANDLE:
2511 cbAdditionalSize = sizeof(pEvent->CreateHandle);
2514 case DB_IPCE_DISPOSE_HANDLE:
2515 cbAdditionalSize = sizeof(pEvent->DisposeHandle);
2518 case DB_IPCE_INTERCEPT_EXCEPTION:
2519 cbAdditionalSize = sizeof(pEvent->InterceptException);
2522 case DB_IPCE_GET_GCHANDLE_INFO:
2523 cbAdditionalSize = sizeof(pEvent->GetGCHandleInfo);
2526 case DB_IPCE_CUSTOM_NOTIFICATION:
2527 cbAdditionalSize = sizeof(pEvent->CustomNotification);
2531 printf("Unknown debugger event type: 0x%x\n", (pEvent->type & DB_IPCE_TYPE_MASK));
2532 _ASSERTE(!"Unknown debugger event type");
2535 return cbBaseSize + cbAdditionalSize;
2538 #pragma warning(pop)
2542 // Debug helper which returns the name associated with a MessageType.
2543 const char *DbgTransportSession::MessageName(MessageType eType)
2547 case MT_SessionRequest:
2548 return "SessionRequest";
2549 case MT_SessionAccept:
2550 return "SessionAccept";
2551 case MT_SessionReject:
2552 return "SessionReject";
2553 case MT_SessionResync:
2554 return "SessionResync";
2555 case MT_SessionClose:
2556 return "SessionClose";
2560 return "ReadMemory";
2561 case MT_WriteMemory:
2562 return "WriteMemory";
2563 case MT_VirtualUnwind:
2564 return "VirtualUnwind";
2569 case MT_GetAppDomainCB:
2570 return "GetAppDomainCB";
2572 _ASSERTE(!"Unknown message type");
2577 // Debug logging helper which logs an incoming message of any type (as long as logging for that message
2578 // class is currently enabled).
2579 void DbgTransportSession::DbgTransportLogMessageReceived(MessageHeader *pHeader)
2581 switch (pHeader->m_eType)
2583 case MT_SessionRequest:
2584 DbgTransportLog(LC_Session, "Received 'SessionRequest'");
2585 DBG_TRANSPORT_INC_STAT(ReceivedSessionRequest);
2587 case MT_SessionAccept:
2588 DbgTransportLog(LC_Session, "Received 'SessionAccept'");
2589 DBG_TRANSPORT_INC_STAT(ReceivedSessionAccept);
2591 case MT_SessionReject:
2592 DbgTransportLog(LC_Session, "Received 'SessionReject'");
2593 DBG_TRANSPORT_INC_STAT(ReceivedSessionReject);
2595 case MT_SessionResync:
2596 DbgTransportLog(LC_Session, "Received 'SessionResync'");
2597 DBG_TRANSPORT_INC_STAT(ReceivedSessionResync);
2599 case MT_SessionClose:
2600 DbgTransportLog(LC_Session, "Received 'SessionClose'");
2601 DBG_TRANSPORT_INC_STAT(ReceivedSessionClose);
2604 DbgTransportLog(LC_Events, "Received '%s'",
2605 IPCENames::GetName((DebuggerIPCEventType)(DWORD)pHeader->TypeSpecificData.Event.m_eType));
2606 DBG_TRANSPORT_INC_STAT(ReceivedEvent);
2608 #ifdef RIGHT_SIDE_COMPILE
2610 DbgTransportLog(LC_Requests, "Received 'ReadMemory(0x%08X, %u)' reply",
2611 (PBYTE)pHeader->TypeSpecificData.MemoryAccess.m_pbLeftSideBuffer,
2612 (DWORD)pHeader->TypeSpecificData.MemoryAccess.m_cbLeftSideBuffer);
2613 DBG_TRANSPORT_INC_STAT(ReceivedReadMemory);
2615 case MT_WriteMemory:
2616 DbgTransportLog(LC_Requests, "Received 'WriteMemory(0x%08X, %u)' reply",
2617 (PBYTE)pHeader->TypeSpecificData.MemoryAccess.m_pbLeftSideBuffer,
2618 (DWORD)pHeader->TypeSpecificData.MemoryAccess.m_cbLeftSideBuffer);
2619 DBG_TRANSPORT_INC_STAT(ReceivedWriteMemory);
2621 case MT_VirtualUnwind:
2622 DbgTransportLog(LC_Requests, "Received 'VirtualUnwind' reply");
2623 DBG_TRANSPORT_INC_STAT(ReceivedVirtualUnwind);
2626 DbgTransportLog(LC_Requests, "Received 'GetDCB' reply");
2627 DBG_TRANSPORT_INC_STAT(ReceivedGetDCB);
2630 DbgTransportLog(LC_Requests, "Received 'SetDCB' reply");
2631 DBG_TRANSPORT_INC_STAT(ReceivedSetDCB);
2633 case MT_GetAppDomainCB:
2634 DbgTransportLog(LC_Requests, "Received 'GetAppDomainCB' reply");
2635 DBG_TRANSPORT_INC_STAT(ReceivedGetAppDomainCB);
2637 #else // RIGHT_SIDE_COMPILE
2639 DbgTransportLog(LC_Requests, "Received 'ReadMemory(0x%08X, %u)'",
2640 (PBYTE)pHeader->TypeSpecificData.MemoryAccess.m_pbLeftSideBuffer,
2641 (DWORD)pHeader->TypeSpecificData.MemoryAccess.m_cbLeftSideBuffer);
2642 DBG_TRANSPORT_INC_STAT(ReceivedReadMemory);
2644 case MT_WriteMemory:
2645 DbgTransportLog(LC_Requests, "Received 'WriteMemory(0x%08X, %u)'",
2646 (PBYTE)pHeader->TypeSpecificData.MemoryAccess.m_pbLeftSideBuffer,
2647 (DWORD)pHeader->TypeSpecificData.MemoryAccess.m_cbLeftSideBuffer);
2648 DBG_TRANSPORT_INC_STAT(ReceivedWriteMemory);
2650 case MT_VirtualUnwind:
2651 DbgTransportLog(LC_Requests, "Received 'VirtualUnwind'");
2652 DBG_TRANSPORT_INC_STAT(ReceivedVirtualUnwind);
2655 DbgTransportLog(LC_Requests, "Received 'GetDCB'");
2656 DBG_TRANSPORT_INC_STAT(ReceivedGetDCB);
2659 DbgTransportLog(LC_Requests, "Received 'SetDCB'");
2660 DBG_TRANSPORT_INC_STAT(ReceivedSetDCB);
2662 case MT_GetAppDomainCB:
2663 DbgTransportLog(LC_Requests, "Received 'GetAppDomainCB'");
2664 DBG_TRANSPORT_INC_STAT(ReceivedGetAppDomainCB);
2666 #endif // RIGHT_SIDE_COMPILE
2668 _ASSERTE(!"Unknown message type");
2673 static CLRRandom s_faultInjectionRandom;
2675 // Helper method used by the DBG_TRANSPORT_SHOULD_INJECT_FAULT macro.
2676 bool DbgTransportSession::DbgTransportShouldInjectFault(DbgTransportFaultOp eOp, const char *szOpName)
2678 static DWORD s_dwFaultInjection = 0xffffffff;
2680 // Init the fault injection system if that hasn't already happened.
2681 if (s_dwFaultInjection == 0xffffffff)
2683 s_dwFaultInjection = CLRConfig::GetConfigValue(CLRConfig::INTERNAL_DbgTransportFaultInject);
2685 // Try for repeatable failures here by always initializing the random seed to a fixed value. But use
2686 // different seeds for the left and right sides or they'll end up in lock step. The
2687 // DBG_TRANSPORT_FAULT_THIS_SIDE macro is a convenient integer value that differs on each side.
2688 s_faultInjectionRandom.Init(DBG_TRANSPORT_FAULT_THIS_SIDE);
2690 // Clamp failure rate to a permissable value.
2691 if ((s_dwFaultInjection & DBG_TRANSPORT_FAULT_RATE_MASK) > 99)
2692 s_dwFaultInjection = (s_dwFaultInjection & ~DBG_TRANSPORT_FAULT_RATE_MASK) | 99;
2695 // Map current session state into the bitmask format used for fault injection control.
2701 dwState = FS_Opening;
2705 dwState = FS_Resync;
2713 _ASSERTE(!"Bad session state");
2716 if ((s_dwFaultInjection & DBG_TRANSPORT_FAULT_THIS_SIDE) &&
2717 (s_dwFaultInjection & eOp) &&
2718 (s_dwFaultInjection & dwState))
2720 // We're faulting this side, op and state. Roll the dice and see if this particular call should fail.
2721 DWORD dwChance = s_faultInjectionRandom.Next(100);
2722 if (dwChance < (s_dwFaultInjection & DBG_TRANSPORT_FAULT_RATE_MASK))
2724 DbgTransportLog(LC_FaultInject, "Injected fault for %s operation", szOpName);
2725 #if defined(FEATURE_CORESYSTEM)
2728 WSASetLastError(WSAEFAULT);
2729 #endif // defined(FEATURE_CORESYSTEM)
2738 // Lock abstraction code (hides difference in lock implementation between left and right side).
2739 #ifdef RIGHT_SIDE_COMPILE
2741 // On the right side we use a CRITICAL_SECTION.
2743 void DbgTransportLock::Init()
2745 InitializeCriticalSection(&m_sLock);
2748 void DbgTransportLock::Destroy()
2750 DeleteCriticalSection(&m_sLock);
2753 void DbgTransportLock::Enter()
2755 EnterCriticalSection(&m_sLock);
2758 void DbgTransportLock::Leave()
2760 LeaveCriticalSection(&m_sLock);
2762 #else // RIGHT_SIDE_COMPILE
2764 // On the left side we use a Crst.
2766 void DbgTransportLock::Init()
2768 m_sLock.Init(CrstDbgTransport, (CrstFlags)(CRST_UNSAFE_ANYMODE | CRST_DEBUGGER_THREAD | CRST_TAKEN_DURING_SHUTDOWN));
2771 void DbgTransportLock::Destroy()
2775 void DbgTransportLock::Enter()
2780 void DbgTransportLock::Leave()
2784 #endif // RIGHT_SIDE_COMPILE
2786 #endif // (!defined(RIGHT_SIDE_COMPILE) && defined(FEATURE_DBGIPC_TRANSPORT_VM)) || (defined(RIGHT_SIDE_COMPILE) && defined(FEATURE_DBGIPC_TRANSPORT_DI))