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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#include "stdafx.h"
#include "dbgtransportsession.h"
#include "dbgtransportmanager.h"
#include "coreclrremotedebugginginterfaces.h"
#ifdef FEATURE_DBGIPC_TRANSPORT_DI
DbgTransportTarget *g_pDbgTransportTarget = NULL;
DbgTransportTarget::DbgTransportTarget()
{
memset(this, 0, sizeof(*this));
}
// Initialization routine called only by the DbgTransportManager.
HRESULT DbgTransportTarget::Init()
{
m_sLock.Init("DbgTransportTarget Lock", RSLock::cLockFlat, RSLock::LL_DBG_TRANSPORT_TARGET_LOCK);
return S_OK;
}
// Shutdown routine called only by the DbgTransportManager.
void DbgTransportTarget::Shutdown()
{
DbgTransportLog(LC_Always, "DbgTransportTarget shutting down");
{
RSLockHolder lock(&m_sLock);
while (m_pProcessList)
{
ProcessEntry *pDelProcess = m_pProcessList;
m_pProcessList = m_pProcessList->m_pNext;
delete pDelProcess;
}
}
m_sLock.Destroy();
}
// Given a PID attempt to find or create a DbgTransportSession instance to manage a connection to a runtime in
// that process. Returns E_UNEXPECTED if the process can't be found. Also returns a handle that can be waited
// on for process termination.
HRESULT DbgTransportTarget::GetTransportForProcess(DWORD dwPID,
DbgTransportSession **ppTransport,
HANDLE *phProcessHandle)
{
RSLockHolder lock(&m_sLock);
HRESULT hr = S_OK;
ProcessEntry *entry = LocateProcessByPID(dwPID);
if (entry == NULL)
{
NewHolder<ProcessEntry> newEntry = new(nothrow) ProcessEntry();
if (newEntry == NULL)
return E_OUTOFMEMORY;
NewHolder<DbgTransportSession> transport = new(nothrow) DbgTransportSession();
if (transport == NULL)
{
return E_OUTOFMEMORY;
}
HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, dwPID);
if (hProcess == NULL)
{
transport->Shutdown();
return HRESULT_FROM_GetLastError();
}
// Initialize it (this immediately starts the remote connection process).
hr = transport->Init(dwPID, hProcess);
if (FAILED(hr))
{
transport->Shutdown();
CloseHandle(hProcess);
return hr;
}
entry = newEntry;
newEntry.SuppressRelease();
entry->m_dwPID = dwPID;
entry->m_hProcess = hProcess;
entry->m_transport = transport;
transport.SuppressRelease();
entry->m_cProcessRef = 0;
// Adding new entry to the list.
entry->m_pNext = m_pProcessList;
m_pProcessList = entry;
}
entry->m_cProcessRef++;
_ASSERTE(entry->m_cProcessRef > 0);
_ASSERTE(entry->m_transport != NULL);
_ASSERTE((intptr_t)entry->m_hProcess > 0);
*ppTransport = entry->m_transport;
if (!DuplicateHandle(GetCurrentProcess(),
entry->m_hProcess,
GetCurrentProcess(),
phProcessHandle,
0, // ignored since we are going to pass DUPLICATE_SAME_ACCESS
FALSE,
DUPLICATE_SAME_ACCESS))
{
return HRESULT_FROM_GetLastError();
}
return hr;
}
// Release another reference to the transport associated with dwPID. Once all references are gone (modulo the
// manager's own weak reference) clean up the transport and deallocate it.
void DbgTransportTarget::ReleaseTransport(DbgTransportSession *pTransport)
{
RSLockHolder lock(&m_sLock);
ProcessEntry *entry = m_pProcessList;
// Pointer to the pointer that points to *entry.
// It either points to m_pProcessList or m_pNext of some entry.
// It is used to fix the linked list after deletion of an entry.
ProcessEntry **prevPtr = &m_pProcessList;
// Looking for ProcessEntry with a given transport
while (entry)
{
_ASSERTE(entry->m_cProcessRef > 0);
_ASSERTE(entry->m_transport != NULL);
_ASSERTE((intptr_t)entry->m_hProcess > 0);
if (entry->m_transport == pTransport)
{
// Mark that it has one less holder now
entry->m_cProcessRef--;
// If no more holders remove the entry from the list and free resources
if (entry->m_cProcessRef == 0)
{
*prevPtr = entry->m_pNext;
delete entry;
}
return;
}
prevPtr = &entry->m_pNext;
entry = entry->m_pNext;
}
_ASSERTE(!"Trying to release transport that doesn't belong to this DbgTransportTarget");
pTransport->Shutdown();
}
HRESULT DbgTransportTarget::CreateProcess(LPCWSTR lpApplicationName,
LPCWSTR lpCommandLine,
LPSECURITY_ATTRIBUTES lpProcessAttributes,
LPSECURITY_ATTRIBUTES lpThreadAttributes,
BOOL bInheritHandles,
DWORD dwCreationFlags,
LPVOID lpEnvironment,
LPCWSTR lpCurrentDirectory,
LPSTARTUPINFOW lpStartupInfo,
LPPROCESS_INFORMATION lpProcessInformation)
{
BOOL result = WszCreateProcess(lpApplicationName,
lpCommandLine,
lpProcessAttributes,
lpThreadAttributes,
bInheritHandles,
dwCreationFlags,
lpEnvironment,
lpCurrentDirectory,
lpStartupInfo,
lpProcessInformation);
if (!result)
{
return HRESULT_FROM_GetLastError();
}
return S_OK;
}
// Kill the process identified by PID.
void DbgTransportTarget::KillProcess(DWORD dwPID)
{
HANDLE hProcess = OpenProcess(PROCESS_TERMINATE, FALSE, dwPID);
if (hProcess != NULL)
{
TerminateProcess(hProcess, 0);
CloseHandle(hProcess);
}
}
DbgTransportTarget::ProcessEntry::~ProcessEntry()
{
CloseHandle(m_hProcess);
m_hProcess = NULL;
m_transport->Shutdown();
m_transport = NULL;
}
// Locate a process entry by PID. Assumes the lock is already held.
DbgTransportTarget::ProcessEntry *DbgTransportTarget::LocateProcessByPID(DWORD dwPID)
{
_ASSERTE(m_sLock.HasLock());
ProcessEntry *pProcess = m_pProcessList;
while (pProcess)
{
if (pProcess->m_dwPID == dwPID)
return pProcess;
pProcess = pProcess->m_pNext;
}
return NULL;
}
#endif // FEATURE_DBGIPC_TRANSPORT_DI
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