Source code of Windows XP (NT5)
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// Connection.cpp: implementation of the CConnection class.
//
//////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#include "ConnMgr.h"
#include "Connection.h"
#include "Ping.h"
#include <process.h>
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
//////////////////////////////////////////////////////////////////////
// CConnection
IMPLEMENT_DYNCREATE(CConnection,CObject)
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
CConnection::CConnection(BSTR bsMachineName, IWbemLocator* pIWbemLocator)
{
OutputDebugString(_T("CConnection::CConnection()\n"));
ASSERT(pIWbemLocator);
Init();
m_bsMachineName = SysAllocString(bsMachineName);
m_sNamespace.Format(_T("\\\\%s\\root\\cimv2\\MicrosoftHealthmonitor"),bsMachineName);
m_pIWbemLocator = pIWbemLocator;
m_pIWbemLocator->AddRef();
StartMonitor();
}
CConnection::CConnection()
{
OutputDebugString(_T("CConnection::CConnection()\n"));
Init();
}
CConnection::~CConnection()
{
OutputDebugString(_T("CConnection::~CConnection()\n"));
// stop monitoring
StopMonitor();
RemoveAllEventEntries();
if( m_pIWbemServices )
{
if (m_bAvailable)
m_pIWbemServices->Release();
m_pIWbemServices = NULL;
}
if (m_pIWbemLocator)
{
if (m_bAvailable)
m_pIWbemLocator->Release();
m_pIWbemLocator = NULL;
}
SysFreeString(m_bsMachineName);
CloseHandle(m_threadData.m_hDie);
CloseHandle(m_threadData.m_hDead);
// zzz
CloseHandle(m_hReadyToConnect);
}
//////////////////////////////////////////////////////////////////////
// Initialize CConnection data members.
//////////////////////////////////////////////////////////////////////
void CConnection::Init()
{
OutputDebugString(_T("CConnection::Init()\n"));
m_bAvailable = false;
m_bFirstConnect = true;
m_pIWbemServices = NULL;
m_pIWbemLocator = NULL;
m_dwPollInterval = 10000;
m_bsMachineName = NULL;
m_threadData.m_hDie = CreateEvent(NULL, TRUE, FALSE, NULL);
m_threadData.m_hDead = CreateEvent(NULL, TRUE, FALSE, NULL);
m_hrLastConnectResult = S_OK;
//zzz
m_hReadyToConnect = CreateEvent(NULL, TRUE, FALSE, NULL);
}
//////////////////////////////////////////////////////////////////////
// Start/Stop Monitoring connection
//////////////////////////////////////////////////////////////////////
void CConnection::StartMonitor()
{
OutputDebugString(_T("CConnection::StartMonitor()\n"));
m_threadData.m_bkptr = this;
m_hThread = (HANDLE)_beginthreadex( NULL,
0,
MonitorConnection,
&m_threadData,
0,
&m_threadID );
if (!m_hThread)
{
OutputDebugString(_T("CConnection::StartMonitor() Error on _beginthreadex\n"));
}
}
void CConnection::StopMonitor()
{
OutputDebugString(_T("CConnection::StopMonitor()\n"));
// tell it to die now.
SetEvent(m_threadData.m_hDie);
// if connection is down just kill it.
if (!m_bAvailable)
{
TerminateThread(m_hThread, 0);
return;
}
// otherwise, give it a chance to die.
if (WAIT_TIMEOUT ==
WaitForSingleObject(m_threadData.m_hDead, m_dwPollInterval))
{
OutputDebugString(_T("CConnection::StartMonitor() Timed out - Killing thread.\n"));
TerminateThread(m_hThread, 0);
}
}
//////////////////////////////////////////////////////////////////////
// Thread Func: Establish initial connection and check status.
//////////////////////////////////////////////////////////////////////
unsigned int __stdcall CConnection::MonitorConnection(void *pv)
{
OutputDebugString(_T("CConnection::MonitorNode() New Thread!\n"));
struct threadData* pData = (struct threadData*)pv;
HRESULT hRes = pData->m_bkptr->Connect(); // Try to connect first.
if (FAILED(hRes))
pData->m_bkptr->NotifyConsole(hRes);
while (true)
{
if (WAIT_OBJECT_0 == WaitForSingleObject(pData->m_hDie,
pData->m_bkptr->m_dwPollInterval) )
{
SetEvent(pData->m_hDead);
break;
}
// Monitor Managed Node
pData->m_bkptr->CheckConnection();
}
_endthreadex(0);
return 0;
}
//////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////
// Check connection status
//////////////////////////////////////////////////////////////////////
void CConnection::CheckConnection()
{
OutputDebugString(_T("CConnection::CheckNode()\n"));
if (m_bAvailable) // Connection is available
{ // Check to see it is still valid.
if (!PingMachine())
{ // Connection went down!
OutputDebugString(_T("CConnection::CheckConnection()-Lost connection!\n"));
m_hrLastConnectResult = WBEM_E_TRANSPORT_FAILURE;
SetConnectionStatus(false);
NotifyConsole(m_hrLastConnectResult);
return;
}
// Now, check Wbem connection
m_hrLastConnectResult = m_pIWbemServices->GetObject(0L,0L,0L,0L,0L);
if (FAILED(m_hrLastConnectResult))
{
// Wbem connection is no longer valid!
OutputDebugString(_T("CConnection::CheckConnection()-Lost wbem connection!\n"));
SetConnectionStatus(false);
NotifyConsole(m_hrLastConnectResult);
}
}
else
{
// Try to re-establish connection
Connect();
}
}
//////////////////////////////////////////////////////////////////////
// Connection operations
//////////////////////////////////////////////////////////////////////
HRESULT CConnection::Connect()
{
OutputDebugString(_T("CConnection::Connect()\n"));
// zzz
WaitForSingleObject(m_hReadyToConnect, INFINITE);
m_hrLastConnectResult = WBEM_E_TRANSPORT_FAILURE;
// can it be reached?
if (!PingMachine())
return m_hrLastConnectResult;
// now, try to connect to namespace
m_hrLastConnectResult = ConnectToNamespace();
if (FAILED(m_hrLastConnectResult))
return m_hrLastConnectResult;
// is agent ready?
if (FAILED(m_hrLastConnectResult = IsAgentReady()))
return m_hrLastConnectResult;
// is agent correct version ?
if( FAILED(m_hrLastConnectResult = IsAgentCorrectVersion()) )
return m_hrLastConnectResult;
UnRegisterAllEvents();
if (SUCCEEDED(m_hrLastConnectResult = RegisterAllEvents()))
{
SetConnectionStatus(true);
NotifyConsole(m_hrLastConnectResult);
}
return m_hrLastConnectResult;
}
inline HRESULT CConnection::IsAgentReady()
{
// check to see if agent providers are ready to service external requests.
if (!m_pIWbemServices)
return WBEM_E_TRANSPORT_FAILURE;
IEnumWbemClassObject* pEnumObj = NULL;
// HMSystemStatus ready?
BSTR bsName = SysAllocString(L"Microsoft_HMSystemStatus");
HRESULT hRes = m_pIWbemServices->CreateInstanceEnum(bsName,
WBEM_FLAG_SHALLOW,
NULL,
&pEnumObj);
SysFreeString(bsName);
if (FAILED(hRes))
{
CString sDebugString;
sDebugString.Format(_T("IsAgentReady()-Agent is unavailable to deliver SystemStatus on %s. Operation failed with result=<%X>."), CString(m_bsMachineName), hRes);
OutputDebugString(sDebugString);
return hRes;
}
pEnumObj->Release();
pEnumObj = NULL;
/*
// HMCatStatus ready?
SysReAllocString(&bsName, L"HMCatStatus");
hRes = m_pIWbemServices->CreateInstanceEnum(bsName,
WBEM_FLAG_SHALLOW,
NULL,
&pEnumObj);
SysFreeString(bsName);
if (FAILED(hRes))
return hRes;
pEnumObj->Release();
pEnumObj = NULL;
// HMMachStatus ready?
SysReAllocString(&bsName, L"HMMachStatus");
hRes = m_pIWbemServices->CreateInstanceEnum(bsName,
WBEM_FLAG_SHALLOW,
NULL,
&pEnumObj);
SysFreeString(bsName);
if (FAILED(hRes))
return hRes;
pEnumObj->Release();
pEnumObj = NULL;
*/
return S_OK;
}
inline HRESULT CConnection::IsAgentCorrectVersion()
{
// check to see if agent is correct version to service external requests.
if (!m_pIWbemServices)
return WBEM_E_TRANSPORT_FAILURE;
IEnumWbemClassObject* pEnumObj = NULL;
// HMVersion check
// enumerate for HMVersion
BSTR bsName = SysAllocString(L"Microsoft_HMVersion");
HRESULT hRes = m_pIWbemServices->CreateInstanceEnum(bsName,
WBEM_FLAG_SHALLOW,
NULL,
&pEnumObj);
SysFreeString(bsName);
if (FAILED(hRes))
{
CString sDebugString;
sDebugString.Format(_T("IsAgentCorrectVersion()-Unable to enumerate for Microsoft_HMVersion on system %s. Operation failed with result=<%X>."), CString(m_bsMachineName), hRes);
OutputDebugString(sDebugString);
return hRes;
}
IWbemClassObject* pObject = NULL;
ULONG uReturned = 0L;
hRes = pEnumObj->Next(WBEM_INFINITE,1,&pObject,&uReturned);
if( FAILED(hRes) || uReturned == 0L )
{
pEnumObj->Release();
pEnumObj = NULL;
CString sDebugString;
sDebugString.Format(_T("IsAgentCorrectVersion()-Unable to enumerate for Microsoft_HMVersion on system %s. Operation failed with result=<%X>.\n"), CString(m_bsMachineName), hRes);
OutputDebugString(sDebugString);
return hRes;
}
VARIANT vPropValue;
VariantInit(&vPropValue);
bsName = SysAllocString(L"MajorVersion");
hRes = pObject->Get(bsName, 0L, &vPropValue, NULL, NULL);
SysFreeString(bsName);
if( FAILED(hRes) )
{
pObject->Release();
pEnumObj->Release();
pEnumObj = NULL;
CString sDebugString;
sDebugString.Format(_T("IsAgentCorrectVersion()-Unable to enumerate for Microsoft_HMVersion on system %s. Operation failed with result=<%X>.\n"), CString(m_bsMachineName), hRes);
OutputDebugString(sDebugString);
return hRes;
}
CString sMajorVersion = V_BSTR(&vPropValue);
VariantClear(&vPropValue);
if( _ttoi(sMajorVersion) != SCHEMA_MAJOR_VERSION )
{
pObject->Release();
pEnumObj->Release();
hRes = E_NOTIMPL;
CString sDebugString;
sDebugString.Format(_T("IsAgentCorrectVersion()-Incorrect Agent version number on system %s.\n"), CString(m_bsMachineName));
OutputDebugString(sDebugString);
return hRes;
}
VariantInit(&vPropValue);
bsName = SysAllocString(L"MinorVersion");
hRes = pObject->Get(bsName, 0L, &vPropValue, NULL, NULL);
SysFreeString(bsName);
if( FAILED(hRes) )
{
pObject->Release();
pEnumObj->Release();
pEnumObj = NULL;
CString sDebugString;
sDebugString.Format(_T("IsAgentCorrectVersion()-Incorrect Agent version number on system %s.\n"), CString(m_bsMachineName));
OutputDebugString(sDebugString);
return hRes;
}
CString sMinorVersion = V_BSTR(&vPropValue);
VariantClear(&vPropValue);
if( _ttoi(sMinorVersion) != SCHEMA_MINOR_VERSION )
{
pObject->Release();
pEnumObj->Release();
hRes = E_NOTIMPL;
CString sDebugString;
sDebugString.Format(_T("IsAgentCorrectVersion()-Incorrect Agent version number on system %s.\n"), CString(m_bsMachineName));
OutputDebugString(sDebugString);
return hRes;
}
pObject->Release();
pEnumObj->Release();
pEnumObj = NULL;
return hRes;
}
inline void CConnection::SetConnectionStatus(BOOL bFlag)
{
OutputDebugString(_T("CConnection::SetConnectionStatus()\n"));
if (m_bAvailable != bFlag)
{
m_bAvailable = bFlag;
}
else
OutputDebugString(_T("CConnection::SetConnectionStatus()-No change in Connection Status!\n"));
}
inline BOOL CConnection::PingMachine()
{
OutputDebugString(_T("CConnection::Ping()\n"));
CPing Pong;
unsigned long ulIP = Pong.ResolveName(m_bsMachineName);
if (!Pong.Ping(ulIP,999))
{
CString sDebugString;
sDebugString.Format(_T("PingMachine() failed on system %s.\n"), CString(m_bsMachineName));
OutputDebugString(sDebugString);
return false;
}
return true;
}
//////////////////////////////////////////////////////////////////////
// Namespace operations
//////////////////////////////////////////////////////////////////////
inline HRESULT CConnection::ConnectToNamespace(BSTR bsNamespace /*= NULL*/)
{
OutputDebugString(_T("CConnection::ConnectToNamespace()\n"));
if (m_pIWbemServices)
{
m_pIWbemServices->Release();
// m_pIWbemServices = NULL();
m_pIWbemServices = NULL;
}
HRESULT hRes;
if( ! bsNamespace )
{
bsNamespace = m_sNamespace.AllocSysString();
hRes = m_pIWbemLocator->ConnectServer(bsNamespace,0L,0L,0L,0L,0L,0L,&m_pIWbemServices);
::SysFreeString(bsNamespace);
}
else
{
hRes = m_pIWbemLocator->ConnectServer(bsNamespace,0L,0L,0L,0L,0L,0L,&m_pIWbemServices);
}
return hRes;
}
//////////////////////////////////////////////////////////////////////
// Event Operations
//////////////////////////////////////////////////////////////////////
BOOL CConnection::AddEventEntry(const CString& sQuery, IWbemObjectSink*& pSink)
{
OutputDebugString(_T("CConnection::AddEventEntry()\n"));
ASSERT(pSink);
if( pSink == NULL )
{
OutputDebugString(_T("CConnection::AddEventEntry()-pSink is NULL. Failed.\n"));
return false;
}
ASSERT(!sQuery.IsEmpty());
if( sQuery.IsEmpty() )
{
OutputDebugString(_T("CConnection::AddEventEntry()-The query string passed is empty. Failed.\n"));
return false;
}
// do not add duplicate event entry.
for (int i = 0; i < m_EventConsumers.GetSize(); i++)
{
if (pSink == m_EventConsumers[i]->m_pSink &&
sQuery == m_EventConsumers[i]->m_sQuery)
return true;
}
CEventRegistrationEntry* pEntry = new CEventRegistrationEntry(sQuery, pSink);
m_EventConsumers.Add(pEntry);
if( m_bAvailable )
{
BSTR bsLang = SysAllocString(L"WQL");
BSTR bsQuery = pEntry->m_sQuery.AllocSysString();
HRESULT hr = m_pIWbemServices->ExecNotificationQueryAsync(bsLang,
bsQuery,
0L,
0L,
pEntry->m_pSink);
::SysFreeString(bsQuery);
::SysFreeString(bsLang);
if (SUCCEEDED(hr))
pEntry->m_bRegistered = true;
}
// zzz
SetEvent(m_hReadyToConnect);
return true;
}
BOOL CConnection::RemoveEventEntry(IWbemObjectSink*& pSink)
{
OutputDebugString(_T("CConnection::RemoveEventEntry()\n"));
for( int i=0; i < m_EventConsumers.GetSize(); i++ )
{
if( pSink == m_EventConsumers[i]->m_pSink )
{
CEventRegistrationEntry* pEntry = m_EventConsumers[i];
ASSERT(pEntry);
ASSERT_VALID(pEntry);
if (pEntry->m_bRegistered && m_pIWbemServices && m_bAvailable)
{
if (SUCCEEDED(m_pIWbemServices->CancelAsyncCall(pEntry->m_pSink)))
pEntry->m_bRegistered = false;
}
delete pEntry;
m_EventConsumers.RemoveAt(i);
return TRUE;
}
}
return TRUE;
}
void CConnection::RemoveAllEventEntries()
{
OutputDebugString(_T("CConnection::RemoveAllEventEntries()\n"));
HRESULT hr;
for (int i=0; i < m_EventConsumers.GetSize(); i++)
{
CEventRegistrationEntry* pEntry = m_EventConsumers[i];
ASSERT(pEntry);
ASSERT_VALID(pEntry);
if (pEntry->m_bRegistered && m_pIWbemServices && m_bAvailable)
hr = m_pIWbemServices->CancelAsyncCall(pEntry->m_pSink);
delete pEntry;
}
m_EventConsumers.RemoveAll();
}
HRESULT CConnection::RegisterAllEvents()
{
OutputDebugString(_T("CConnection::RegisterAllEvents()\n"));
// if there's no sink, return server too busy.
if (!m_EventConsumers.GetSize())
return WBEM_E_SERVER_TOO_BUSY;
HRESULT hr = S_OK;
int i = 0;
BSTR bsLang = SysAllocString(L"WQL");
for(i=0; i < m_EventConsumers.GetSize(); i++)
{
CEventRegistrationEntry* pEntry = m_EventConsumers[i];
ASSERT(pEntry);
ASSERT_VALID(pEntry);
if( pEntry->m_eType != AsyncQuery )
{
BSTR bsQuery = pEntry->m_sQuery.AllocSysString();
OutputDebugString(_T("\t"));
OutputDebugString(pEntry->m_sQuery);
OutputDebugString(_T("\n"));
hr = m_pIWbemServices->ExecNotificationQueryAsync(bsLang,
bsQuery,
0L,
0L,
pEntry->m_pSink);
::SysFreeString(bsQuery);
if (SUCCEEDED(hr))
pEntry->m_bRegistered = true;
else
break;
}
else
{
pEntry->SendInstances(m_pIWbemServices,2);
m_EventConsumers.RemoveAt(i);
delete pEntry;
}
}
::SysFreeString(bsLang);
// Cancel any succeeded calls????
/*
i--;
if (FAILED(hr) && i >= 0)
{ // cancel succeeded calls
while(i>=0)
{
CEventRegistrationEntry* pEntry = m_EventConsumers[i];
ASSERT(pEntry);
ASSERT_VALID(pEntry);
if (pEntry->m_bRegistered)
{
HRESULT hRes = m_pIWbemServices->CancelAsyncCall(pEntry->m_pSink);
pEntry->m_bRegistered = false;
}
i--;
}
}
*/
return hr;
}
void CConnection::UnRegisterAllEvents()
{
OutputDebugString(_T("CConnection::UnRegisterAllEvents()\n"));
for (int i=0; i < m_EventConsumers.GetSize(); i++)
{
CEventRegistrationEntry* pEntry = m_EventConsumers[i];
ASSERT(pEntry);
ASSERT_VALID(pEntry);
if (pEntry->m_bRegistered && pEntry->m_eType != AsyncQuery )
{
HRESULT hr = m_pIWbemServices->CancelAsyncCall(pEntry->m_pSink);
pEntry->m_bRegistered = false;
}
}
}
//////////////////////////////////////////////////////////////////////
// Console notification
//////////////////////////////////////////////////////////////////////
inline HRESULT CConnection::NotifyConsole(HRESULT hRes)
{
OutputDebugString(_T("CConnection::NotifyCosole()\n"));
HRESULT hr = S_OK;
// Set notify flag appropriately
long lFlag = 0;
if (hRes == S_OK)
{
if (m_bFirstConnect)
{
lFlag = 2;
}
else
lFlag = 1;
}
for (int i=0; i < m_EventConsumers.GetSize(); i++)
{
CEventRegistrationEntry* pEntry = m_EventConsumers[i];
ASSERT(pEntry);
ASSERT_VALID(pEntry);
// Notify console w/ connection status
if (i == 0)
hr = pEntry->NotifyConsole(lFlag, hRes);
// If connection is bad, no need to continue
if (hRes != S_OK)
break;
// Reset first connect flag
if (SUCCEEDED(hr) && m_bFirstConnect)
m_bFirstConnect = false;
HRESULT hr2 = pEntry->SendInstances(m_pIWbemServices, lFlag);
}
return hRes;
}